Commit | Line | Data |
---|---|---|
2b188cc1 JA |
1 | // SPDX-License-Identifier: GPL-2.0 |
2 | /* | |
3 | * Shared application/kernel submission and completion ring pairs, for | |
4 | * supporting fast/efficient IO. | |
5 | * | |
6 | * A note on the read/write ordering memory barriers that are matched between | |
1e84b97b SB |
7 | * the application and kernel side. |
8 | * | |
9 | * After the application reads the CQ ring tail, it must use an | |
10 | * appropriate smp_rmb() to pair with the smp_wmb() the kernel uses | |
11 | * before writing the tail (using smp_load_acquire to read the tail will | |
12 | * do). It also needs a smp_mb() before updating CQ head (ordering the | |
13 | * entry load(s) with the head store), pairing with an implicit barrier | |
d068b506 | 14 | * through a control-dependency in io_get_cqe (smp_store_release to |
1e84b97b SB |
15 | * store head will do). Failure to do so could lead to reading invalid |
16 | * CQ entries. | |
17 | * | |
18 | * Likewise, the application must use an appropriate smp_wmb() before | |
19 | * writing the SQ tail (ordering SQ entry stores with the tail store), | |
20 | * which pairs with smp_load_acquire in io_get_sqring (smp_store_release | |
21 | * to store the tail will do). And it needs a barrier ordering the SQ | |
22 | * head load before writing new SQ entries (smp_load_acquire to read | |
23 | * head will do). | |
24 | * | |
25 | * When using the SQ poll thread (IORING_SETUP_SQPOLL), the application | |
26 | * needs to check the SQ flags for IORING_SQ_NEED_WAKEUP *after* | |
27 | * updating the SQ tail; a full memory barrier smp_mb() is needed | |
28 | * between. | |
2b188cc1 JA |
29 | * |
30 | * Also see the examples in the liburing library: | |
31 | * | |
32 | * git://git.kernel.dk/liburing | |
33 | * | |
34 | * io_uring also uses READ/WRITE_ONCE() for _any_ store or load that happens | |
35 | * from data shared between the kernel and application. This is done both | |
36 | * for ordering purposes, but also to ensure that once a value is loaded from | |
37 | * data that the application could potentially modify, it remains stable. | |
38 | * | |
39 | * Copyright (C) 2018-2019 Jens Axboe | |
c992fe29 | 40 | * Copyright (c) 2018-2019 Christoph Hellwig |
2b188cc1 JA |
41 | */ |
42 | #include <linux/kernel.h> | |
43 | #include <linux/init.h> | |
44 | #include <linux/errno.h> | |
45 | #include <linux/syscalls.h> | |
46 | #include <linux/compat.h> | |
52de1fe1 | 47 | #include <net/compat.h> |
2b188cc1 JA |
48 | #include <linux/refcount.h> |
49 | #include <linux/uio.h> | |
6b47ee6e | 50 | #include <linux/bits.h> |
2b188cc1 JA |
51 | |
52 | #include <linux/sched/signal.h> | |
53 | #include <linux/fs.h> | |
54 | #include <linux/file.h> | |
55 | #include <linux/fdtable.h> | |
56 | #include <linux/mm.h> | |
57 | #include <linux/mman.h> | |
2b188cc1 JA |
58 | #include <linux/percpu.h> |
59 | #include <linux/slab.h> | |
edce22e1 | 60 | #include <linux/blk-mq.h> |
edafccee | 61 | #include <linux/bvec.h> |
2b188cc1 JA |
62 | #include <linux/net.h> |
63 | #include <net/sock.h> | |
64 | #include <net/af_unix.h> | |
6b06314c | 65 | #include <net/scm.h> |
2b188cc1 JA |
66 | #include <linux/anon_inodes.h> |
67 | #include <linux/sched/mm.h> | |
68 | #include <linux/uaccess.h> | |
69 | #include <linux/nospec.h> | |
edafccee JA |
70 | #include <linux/sizes.h> |
71 | #include <linux/hugetlb.h> | |
aa4c3967 | 72 | #include <linux/highmem.h> |
15b71abe JA |
73 | #include <linux/namei.h> |
74 | #include <linux/fsnotify.h> | |
4840e418 | 75 | #include <linux/fadvise.h> |
3e4827b0 | 76 | #include <linux/eventpoll.h> |
7d67af2c | 77 | #include <linux/splice.h> |
b41e9852 | 78 | #include <linux/task_work.h> |
bcf5a063 | 79 | #include <linux/pagemap.h> |
0f212204 | 80 | #include <linux/io_uring.h> |
5bd2182d | 81 | #include <linux/audit.h> |
cdc1404a | 82 | #include <linux/security.h> |
e9621e2b | 83 | #include <linux/xattr.h> |
2b188cc1 | 84 | |
c826bd7a DD |
85 | #define CREATE_TRACE_POINTS |
86 | #include <trace/events/io_uring.h> | |
87 | ||
2b188cc1 JA |
88 | #include <uapi/linux/io_uring.h> |
89 | ||
90 | #include "internal.h" | |
561fb04a | 91 | #include "io-wq.h" |
2b188cc1 | 92 | |
5277deaa | 93 | #define IORING_MAX_ENTRIES 32768 |
33a107f0 | 94 | #define IORING_MAX_CQ_ENTRIES (2 * IORING_MAX_ENTRIES) |
4ce8ad95 | 95 | #define IORING_SQPOLL_CAP_ENTRIES_VALUE 8 |
65e19f54 | 96 | |
187f08c1 | 97 | /* only define max */ |
09893e15 | 98 | #define IORING_MAX_FIXED_FILES (1U << 20) |
21b55dbc SG |
99 | #define IORING_MAX_RESTRICTIONS (IORING_RESTRICTION_LAST + \ |
100 | IORING_REGISTER_LAST + IORING_OP_LAST) | |
2b188cc1 | 101 | |
187f08c1 | 102 | #define IO_RSRC_TAG_TABLE_SHIFT (PAGE_SHIFT - 3) |
2d091d62 PB |
103 | #define IO_RSRC_TAG_TABLE_MAX (1U << IO_RSRC_TAG_TABLE_SHIFT) |
104 | #define IO_RSRC_TAG_TABLE_MASK (IO_RSRC_TAG_TABLE_MAX - 1) | |
105 | ||
489809e2 PB |
106 | #define IORING_MAX_REG_BUFFERS (1U << 14) |
107 | ||
68fe256a PB |
108 | #define SQE_COMMON_FLAGS (IOSQE_FIXED_FILE | IOSQE_IO_LINK | \ |
109 | IOSQE_IO_HARDLINK | IOSQE_ASYNC) | |
110 | ||
5562a8d7 PB |
111 | #define SQE_VALID_FLAGS (SQE_COMMON_FLAGS | IOSQE_BUFFER_SELECT | \ |
112 | IOSQE_IO_DRAIN | IOSQE_CQE_SKIP_SUCCESS) | |
68fe256a | 113 | |
c854357b | 114 | #define IO_REQ_CLEAN_FLAGS (REQ_F_BUFFER_SELECTED | REQ_F_NEED_CLEANUP | \ |
9cae36a0 JA |
115 | REQ_F_POLLED | REQ_F_INFLIGHT | REQ_F_CREDS | \ |
116 | REQ_F_ASYNC_DATA) | |
b16fed66 | 117 | |
a538be5b PB |
118 | #define IO_REQ_CLEAN_SLOW_FLAGS (REQ_F_REFCOUNT | REQ_F_LINK | REQ_F_HARDLINK |\ |
119 | IO_REQ_CLEAN_FLAGS) | |
120 | ||
227685eb HX |
121 | #define IO_APOLL_MULTI_POLLED (REQ_F_APOLL_MULTISHOT | REQ_F_POLLED) |
122 | ||
09899b19 PB |
123 | #define IO_TCTX_REFS_CACHE_NR (1U << 10) |
124 | ||
2b188cc1 JA |
125 | struct io_uring { |
126 | u32 head ____cacheline_aligned_in_smp; | |
127 | u32 tail ____cacheline_aligned_in_smp; | |
128 | }; | |
129 | ||
1e84b97b | 130 | /* |
75b28aff HV |
131 | * This data is shared with the application through the mmap at offsets |
132 | * IORING_OFF_SQ_RING and IORING_OFF_CQ_RING. | |
1e84b97b SB |
133 | * |
134 | * The offsets to the member fields are published through struct | |
135 | * io_sqring_offsets when calling io_uring_setup. | |
136 | */ | |
75b28aff | 137 | struct io_rings { |
1e84b97b SB |
138 | /* |
139 | * Head and tail offsets into the ring; the offsets need to be | |
140 | * masked to get valid indices. | |
141 | * | |
75b28aff HV |
142 | * The kernel controls head of the sq ring and the tail of the cq ring, |
143 | * and the application controls tail of the sq ring and the head of the | |
144 | * cq ring. | |
1e84b97b | 145 | */ |
75b28aff | 146 | struct io_uring sq, cq; |
1e84b97b | 147 | /* |
75b28aff | 148 | * Bitmasks to apply to head and tail offsets (constant, equals |
1e84b97b SB |
149 | * ring_entries - 1) |
150 | */ | |
75b28aff HV |
151 | u32 sq_ring_mask, cq_ring_mask; |
152 | /* Ring sizes (constant, power of 2) */ | |
153 | u32 sq_ring_entries, cq_ring_entries; | |
1e84b97b SB |
154 | /* |
155 | * Number of invalid entries dropped by the kernel due to | |
156 | * invalid index stored in array | |
157 | * | |
158 | * Written by the kernel, shouldn't be modified by the | |
159 | * application (i.e. get number of "new events" by comparing to | |
160 | * cached value). | |
161 | * | |
162 | * After a new SQ head value was read by the application this | |
163 | * counter includes all submissions that were dropped reaching | |
164 | * the new SQ head (and possibly more). | |
165 | */ | |
75b28aff | 166 | u32 sq_dropped; |
1e84b97b | 167 | /* |
0d9b5b3a | 168 | * Runtime SQ flags |
1e84b97b SB |
169 | * |
170 | * Written by the kernel, shouldn't be modified by the | |
171 | * application. | |
172 | * | |
173 | * The application needs a full memory barrier before checking | |
174 | * for IORING_SQ_NEED_WAKEUP after updating the sq tail. | |
175 | */ | |
3a4b89a2 | 176 | atomic_t sq_flags; |
0d9b5b3a SG |
177 | /* |
178 | * Runtime CQ flags | |
179 | * | |
180 | * Written by the application, shouldn't be modified by the | |
181 | * kernel. | |
182 | */ | |
fe7e3257 | 183 | u32 cq_flags; |
1e84b97b SB |
184 | /* |
185 | * Number of completion events lost because the queue was full; | |
186 | * this should be avoided by the application by making sure | |
0b4295b5 | 187 | * there are not more requests pending than there is space in |
1e84b97b SB |
188 | * the completion queue. |
189 | * | |
190 | * Written by the kernel, shouldn't be modified by the | |
191 | * application (i.e. get number of "new events" by comparing to | |
192 | * cached value). | |
193 | * | |
194 | * As completion events come in out of order this counter is not | |
195 | * ordered with any other data. | |
196 | */ | |
75b28aff | 197 | u32 cq_overflow; |
1e84b97b SB |
198 | /* |
199 | * Ring buffer of completion events. | |
200 | * | |
201 | * The kernel writes completion events fresh every time they are | |
202 | * produced, so the application is allowed to modify pending | |
203 | * entries. | |
204 | */ | |
75b28aff | 205 | struct io_uring_cqe cqes[] ____cacheline_aligned_in_smp; |
2b188cc1 JA |
206 | }; |
207 | ||
edafccee JA |
208 | struct io_mapped_ubuf { |
209 | u64 ubuf; | |
4751f53d | 210 | u64 ubuf_end; |
edafccee | 211 | unsigned int nr_bvecs; |
de293938 | 212 | unsigned long acct_pages; |
41edf1a5 | 213 | struct bio_vec bvec[]; |
edafccee JA |
214 | }; |
215 | ||
50238531 BM |
216 | struct io_ring_ctx; |
217 | ||
6c2450ae | 218 | struct io_overflow_cqe { |
6c2450ae | 219 | struct list_head list; |
e45a3e05 | 220 | struct io_uring_cqe cqe; |
6c2450ae PB |
221 | }; |
222 | ||
5e45690a JA |
223 | /* |
224 | * FFS_SCM is only available on 64-bit archs, for 32-bit we just define it as 0 | |
225 | * and define IO_URING_SCM_ALL. For this case, we use SCM for all files as we | |
226 | * can't safely always dereference the file when the task has exited and ring | |
227 | * cleanup is done. If a file is tracked and part of SCM, then unix gc on | |
228 | * process exit may reap it before __io_sqe_files_unregister() is run. | |
229 | */ | |
230 | #define FFS_NOWAIT 0x1UL | |
231 | #define FFS_ISREG 0x2UL | |
232 | #if defined(CONFIG_64BIT) | |
233 | #define FFS_SCM 0x4UL | |
234 | #else | |
235 | #define IO_URING_SCM_ALL | |
236 | #define FFS_SCM 0x0UL | |
237 | #endif | |
238 | #define FFS_MASK ~(FFS_NOWAIT|FFS_ISREG|FFS_SCM) | |
239 | ||
a04b0ac0 PB |
240 | struct io_fixed_file { |
241 | /* file * with additional FFS_* flags */ | |
242 | unsigned long file_ptr; | |
243 | }; | |
244 | ||
269bbe5f BM |
245 | struct io_rsrc_put { |
246 | struct list_head list; | |
b60c8dce | 247 | u64 tag; |
50238531 BM |
248 | union { |
249 | void *rsrc; | |
250 | struct file *file; | |
bd54b6fe | 251 | struct io_mapped_ubuf *buf; |
50238531 | 252 | }; |
269bbe5f BM |
253 | }; |
254 | ||
aeca241b | 255 | struct io_file_table { |
042b0d85 | 256 | struct io_fixed_file *files; |
d78bd8ad | 257 | unsigned long *bitmap; |
b70b8e33 | 258 | unsigned int alloc_hint; |
31b51510 JA |
259 | }; |
260 | ||
b895c9a6 | 261 | struct io_rsrc_node { |
05589553 XW |
262 | struct percpu_ref refs; |
263 | struct list_head node; | |
269bbe5f | 264 | struct list_head rsrc_list; |
b895c9a6 | 265 | struct io_rsrc_data *rsrc_data; |
4a38aed2 | 266 | struct llist_node llist; |
e297822b | 267 | bool done; |
05589553 XW |
268 | }; |
269 | ||
40ae0ff7 PB |
270 | typedef void (rsrc_put_fn)(struct io_ring_ctx *ctx, struct io_rsrc_put *prsrc); |
271 | ||
b895c9a6 | 272 | struct io_rsrc_data { |
05f3fb3c JA |
273 | struct io_ring_ctx *ctx; |
274 | ||
2d091d62 PB |
275 | u64 **tags; |
276 | unsigned int nr; | |
40ae0ff7 | 277 | rsrc_put_fn *do_put; |
3e942498 | 278 | atomic_t refs; |
05f3fb3c | 279 | struct completion done; |
8bad28d8 | 280 | bool quiesce; |
05f3fb3c JA |
281 | }; |
282 | ||
c7fb1942 | 283 | #define IO_BUFFER_LIST_BUF_PER_PAGE (PAGE_SIZE / sizeof(struct io_uring_buf)) |
dbc7d452 | 284 | struct io_buffer_list { |
c7fb1942 JA |
285 | /* |
286 | * If ->buf_nr_pages is set, then buf_pages/buf_ring are used. If not, | |
287 | * then these are classic provided buffers and ->buf_list is used. | |
288 | */ | |
289 | union { | |
290 | struct list_head buf_list; | |
291 | struct { | |
292 | struct page **buf_pages; | |
293 | struct io_uring_buf_ring *buf_ring; | |
294 | }; | |
295 | }; | |
dbc7d452 | 296 | __u16 bgid; |
c7fb1942 JA |
297 | |
298 | /* below is for ring provided buffers */ | |
299 | __u16 buf_nr_pages; | |
300 | __u16 nr_entries; | |
301 | __u32 head; | |
302 | __u32 mask; | |
dbc7d452 JA |
303 | }; |
304 | ||
5a2e745d JA |
305 | struct io_buffer { |
306 | struct list_head list; | |
307 | __u64 addr; | |
d1f82808 | 308 | __u32 len; |
5a2e745d | 309 | __u16 bid; |
b1c62645 | 310 | __u16 bgid; |
5a2e745d JA |
311 | }; |
312 | ||
21b55dbc SG |
313 | struct io_restriction { |
314 | DECLARE_BITMAP(register_op, IORING_REGISTER_LAST); | |
315 | DECLARE_BITMAP(sqe_op, IORING_OP_LAST); | |
316 | u8 sqe_flags_allowed; | |
317 | u8 sqe_flags_required; | |
7e84e1c7 | 318 | bool registered; |
21b55dbc SG |
319 | }; |
320 | ||
37d1e2e3 JA |
321 | enum { |
322 | IO_SQ_THREAD_SHOULD_STOP = 0, | |
323 | IO_SQ_THREAD_SHOULD_PARK, | |
324 | }; | |
325 | ||
534ca6d6 JA |
326 | struct io_sq_data { |
327 | refcount_t refs; | |
9e138a48 | 328 | atomic_t park_pending; |
09a6f4ef | 329 | struct mutex lock; |
69fb2131 JA |
330 | |
331 | /* ctx's that are using this sqd */ | |
332 | struct list_head ctx_list; | |
69fb2131 | 333 | |
534ca6d6 JA |
334 | struct task_struct *thread; |
335 | struct wait_queue_head wait; | |
08369246 XW |
336 | |
337 | unsigned sq_thread_idle; | |
37d1e2e3 JA |
338 | int sq_cpu; |
339 | pid_t task_pid; | |
5c2469e0 | 340 | pid_t task_tgid; |
37d1e2e3 JA |
341 | |
342 | unsigned long state; | |
37d1e2e3 | 343 | struct completion exited; |
534ca6d6 JA |
344 | }; |
345 | ||
6dd0be1e | 346 | #define IO_COMPL_BATCH 32 |
6ff119a6 | 347 | #define IO_REQ_CACHE_SIZE 32 |
bf019da7 | 348 | #define IO_REQ_ALLOC_BATCH 8 |
258b29a9 | 349 | |
a1ab7b35 PB |
350 | struct io_submit_link { |
351 | struct io_kiocb *head; | |
352 | struct io_kiocb *last; | |
353 | }; | |
354 | ||
258b29a9 | 355 | struct io_submit_state { |
5a158c6b PB |
356 | /* inline/task_work completion list, under ->uring_lock */ |
357 | struct io_wq_work_node free_list; | |
358 | /* batch completion logic */ | |
359 | struct io_wq_work_list compl_reqs; | |
a1ab7b35 | 360 | struct io_submit_link link; |
258b29a9 | 361 | |
258b29a9 | 362 | bool plug_started; |
4b628aeb | 363 | bool need_plug; |
3d4aeb9f | 364 | bool flush_cqes; |
5ca7a8b3 | 365 | unsigned short submit_nr; |
5a158c6b | 366 | struct blk_plug plug; |
258b29a9 PB |
367 | }; |
368 | ||
77bc59b4 UA |
369 | struct io_ev_fd { |
370 | struct eventfd_ctx *cq_ev_fd; | |
c75312dd | 371 | unsigned int eventfd_async: 1; |
77bc59b4 UA |
372 | struct rcu_head rcu; |
373 | }; | |
374 | ||
9cfc7e94 | 375 | #define BGID_ARRAY 64 |
dbc7d452 | 376 | |
2b188cc1 | 377 | struct io_ring_ctx { |
b52ecf8c | 378 | /* const or read-mostly hot data */ |
2b188cc1 JA |
379 | struct { |
380 | struct percpu_ref refs; | |
2b188cc1 | 381 | |
b52ecf8c | 382 | struct io_rings *rings; |
2b188cc1 | 383 | unsigned int flags; |
9f010507 | 384 | enum task_work_notify_mode notify_method; |
e1d85334 | 385 | unsigned int compat: 1; |
e1d85334 | 386 | unsigned int drain_next: 1; |
21b55dbc | 387 | unsigned int restricted: 1; |
f18ee4cf | 388 | unsigned int off_timeout_used: 1; |
10c66904 | 389 | unsigned int drain_active: 1; |
5562a8d7 | 390 | unsigned int drain_disabled: 1; |
9aa8dfde | 391 | unsigned int has_evfd: 1; |
773697b6 | 392 | unsigned int syscall_iopoll: 1; |
b52ecf8c | 393 | } ____cacheline_aligned_in_smp; |
2b188cc1 | 394 | |
7f1129d2 | 395 | /* submission data */ |
b52ecf8c | 396 | struct { |
0499e582 PB |
397 | struct mutex uring_lock; |
398 | ||
75b28aff HV |
399 | /* |
400 | * Ring buffer of indices into array of io_uring_sqe, which is | |
401 | * mmapped by the application using the IORING_OFF_SQES offset. | |
402 | * | |
403 | * This indirection could e.g. be used to assign fixed | |
404 | * io_uring_sqe entries to operations and only submit them to | |
405 | * the queue when needed. | |
406 | * | |
407 | * The kernel modifies neither the indices array nor the entries | |
408 | * array. | |
409 | */ | |
410 | u32 *sq_array; | |
c7af47cf | 411 | struct io_uring_sqe *sq_sqes; |
2b188cc1 JA |
412 | unsigned cached_sq_head; |
413 | unsigned sq_entries; | |
de0617e4 | 414 | struct list_head defer_list; |
7f1129d2 PB |
415 | |
416 | /* | |
417 | * Fixed resources fast path, should be accessed only under | |
418 | * uring_lock, and updated through io_uring_register(2) | |
419 | */ | |
420 | struct io_rsrc_node *rsrc_node; | |
ab409402 | 421 | int rsrc_cached_refs; |
8e29da69 | 422 | atomic_t cancel_seq; |
7f1129d2 PB |
423 | struct io_file_table file_table; |
424 | unsigned nr_user_files; | |
425 | unsigned nr_user_bufs; | |
426 | struct io_mapped_ubuf **user_bufs; | |
427 | ||
428 | struct io_submit_state submit_state; | |
660cbfa2 | 429 | |
9cfc7e94 JA |
430 | struct io_buffer_list *io_bl; |
431 | struct xarray io_bl_xa; | |
cc3cec83 | 432 | struct list_head io_buffers_cache; |
660cbfa2 | 433 | |
5262f567 | 434 | struct list_head timeout_list; |
ef9dd637 | 435 | struct list_head ltimeout_list; |
1d7bb1d5 | 436 | struct list_head cq_overflow_list; |
4d9237e3 | 437 | struct list_head apoll_cache; |
7f1129d2 PB |
438 | struct xarray personalities; |
439 | u32 pers_next; | |
440 | unsigned sq_thread_idle; | |
2b188cc1 JA |
441 | } ____cacheline_aligned_in_smp; |
442 | ||
d0acdee2 | 443 | /* IRQ completion list, under ->completion_lock */ |
c2b6c6bc | 444 | struct io_wq_work_list locked_free_list; |
d0acdee2 | 445 | unsigned int locked_free_nr; |
3c1a2ead | 446 | |
7c30f36a | 447 | const struct cred *sq_creds; /* cred used for __io_sq_thread() */ |
534ca6d6 JA |
448 | struct io_sq_data *sq_data; /* if using sq thread polling */ |
449 | ||
90554200 | 450 | struct wait_queue_head sqo_sq_wait; |
69fb2131 | 451 | struct list_head sqd_list; |
75b28aff | 452 | |
10988a0a | 453 | unsigned long check_cq; |
5ed7a37d | 454 | |
206aefde | 455 | struct { |
d8da428b PB |
456 | /* |
457 | * We cache a range of free CQEs we can use, once exhausted it | |
458 | * should go through a slower range setup, see __io_get_cqe() | |
459 | */ | |
460 | struct io_uring_cqe *cqe_cached; | |
461 | struct io_uring_cqe *cqe_sentinel; | |
462 | ||
206aefde JA |
463 | unsigned cached_cq_tail; |
464 | unsigned cq_entries; | |
77bc59b4 | 465 | struct io_ev_fd __rcu *io_ev_fd; |
0499e582 PB |
466 | struct wait_queue_head cq_wait; |
467 | unsigned cq_extra; | |
468 | atomic_t cq_timeouts; | |
0499e582 | 469 | unsigned cq_last_tm_flush; |
206aefde | 470 | } ____cacheline_aligned_in_smp; |
2b188cc1 | 471 | |
2b188cc1 JA |
472 | struct { |
473 | spinlock_t completion_lock; | |
e94f141b | 474 | |
89850fce JA |
475 | spinlock_t timeout_lock; |
476 | ||
def596e9 | 477 | /* |
540e32a0 | 478 | * ->iopoll_list is protected by the ctx->uring_lock for |
def596e9 JA |
479 | * io_uring instances that don't use IORING_SETUP_SQPOLL. |
480 | * For SQPOLL, only the single threaded io_sq_thread() will | |
481 | * manipulate the list, hence no extra locking is needed there. | |
482 | */ | |
5eef4e87 | 483 | struct io_wq_work_list iopoll_list; |
78076bb6 JA |
484 | struct hlist_head *cancel_hash; |
485 | unsigned cancel_hash_bits; | |
915b3dde | 486 | bool poll_multi_queue; |
cc3cec83 JA |
487 | |
488 | struct list_head io_buffers_comp; | |
2b188cc1 | 489 | } ____cacheline_aligned_in_smp; |
85faa7b8 | 490 | |
21b55dbc | 491 | struct io_restriction restrictions; |
3c1a2ead | 492 | |
b13a8918 PB |
493 | /* slow path rsrc auxilary data, used by update/register */ |
494 | struct { | |
495 | struct io_rsrc_node *rsrc_backup_node; | |
496 | struct io_mapped_ubuf *dummy_ubuf; | |
497 | struct io_rsrc_data *file_data; | |
498 | struct io_rsrc_data *buf_data; | |
499 | ||
500 | struct delayed_work rsrc_put_work; | |
501 | struct llist_head rsrc_put_llist; | |
502 | struct list_head rsrc_ref_list; | |
503 | spinlock_t rsrc_ref_lock; | |
cc3cec83 JA |
504 | |
505 | struct list_head io_buffers_pages; | |
b13a8918 PB |
506 | }; |
507 | ||
3c1a2ead | 508 | /* Keep this last, we don't need it for the fast path */ |
b986af7e PB |
509 | struct { |
510 | #if defined(CONFIG_UNIX) | |
511 | struct socket *ring_sock; | |
512 | #endif | |
513 | /* hashed buffered write serialization */ | |
514 | struct io_wq_hash *hash_map; | |
515 | ||
516 | /* Only used for accounting purposes */ | |
517 | struct user_struct *user; | |
518 | struct mm_struct *mm_account; | |
519 | ||
520 | /* ctx exit and cancelation */ | |
9011bf9a PB |
521 | struct llist_head fallback_llist; |
522 | struct delayed_work fallback_work; | |
b986af7e PB |
523 | struct work_struct exit_work; |
524 | struct list_head tctx_list; | |
525 | struct completion ref_comp; | |
e139a1ec PB |
526 | u32 iowq_limits[2]; |
527 | bool iowq_limits_set; | |
b986af7e | 528 | }; |
2b188cc1 JA |
529 | }; |
530 | ||
e7a6c00d JA |
531 | /* |
532 | * Arbitrary limit, can be raised if need be | |
533 | */ | |
534 | #define IO_RINGFD_REG_MAX 16 | |
535 | ||
53e043b2 SM |
536 | struct io_uring_task { |
537 | /* submission side */ | |
09899b19 | 538 | int cached_refs; |
53e043b2 SM |
539 | struct xarray xa; |
540 | struct wait_queue_head wait; | |
ee53fb2b SM |
541 | const struct io_ring_ctx *last; |
542 | struct io_wq *io_wq; | |
53e043b2 | 543 | struct percpu_counter inflight; |
9cae36a0 | 544 | atomic_t inflight_tracked; |
53e043b2 | 545 | atomic_t in_idle; |
53e043b2 SM |
546 | |
547 | spinlock_t task_lock; | |
548 | struct io_wq_work_list task_list; | |
3fe07bcd | 549 | struct io_wq_work_list prio_task_list; |
53e043b2 | 550 | struct callback_head task_work; |
e7a6c00d | 551 | struct file **registered_rings; |
6294f368 | 552 | bool task_running; |
53e043b2 SM |
553 | }; |
554 | ||
09bb8394 JA |
555 | /* |
556 | * First field must be the file pointer in all the | |
557 | * iocb unions! See also 'struct kiocb' in <linux/fs.h> | |
558 | */ | |
221c5eb2 JA |
559 | struct io_poll_iocb { |
560 | struct file *file; | |
018043be | 561 | struct wait_queue_head *head; |
221c5eb2 | 562 | __poll_t events; |
392edb45 | 563 | struct wait_queue_entry wait; |
221c5eb2 JA |
564 | }; |
565 | ||
9d805892 | 566 | struct io_poll_update { |
018043be | 567 | struct file *file; |
9d805892 PB |
568 | u64 old_user_data; |
569 | u64 new_user_data; | |
570 | __poll_t events; | |
b69de288 JA |
571 | bool update_events; |
572 | bool update_user_data; | |
018043be PB |
573 | }; |
574 | ||
b5dba59e JA |
575 | struct io_close { |
576 | struct file *file; | |
b5dba59e | 577 | int fd; |
7df778be | 578 | u32 file_slot; |
a7c41b46 | 579 | u32 flags; |
b5dba59e JA |
580 | }; |
581 | ||
ad8a48ac JA |
582 | struct io_timeout_data { |
583 | struct io_kiocb *req; | |
584 | struct hrtimer timer; | |
585 | struct timespec64 ts; | |
586 | enum hrtimer_mode mode; | |
50c1df2b | 587 | u32 flags; |
ad8a48ac JA |
588 | }; |
589 | ||
8ed8d3c3 JA |
590 | struct io_accept { |
591 | struct file *file; | |
592 | struct sockaddr __user *addr; | |
593 | int __user *addr_len; | |
594 | int flags; | |
aaa4db12 | 595 | u32 file_slot; |
09952e3e | 596 | unsigned long nofile; |
8ed8d3c3 JA |
597 | }; |
598 | ||
1374e08e JA |
599 | struct io_socket { |
600 | struct file *file; | |
601 | int domain; | |
602 | int type; | |
603 | int protocol; | |
604 | int flags; | |
605 | u32 file_slot; | |
606 | unsigned long nofile; | |
607 | }; | |
608 | ||
8ed8d3c3 JA |
609 | struct io_sync { |
610 | struct file *file; | |
611 | loff_t len; | |
612 | loff_t off; | |
613 | int flags; | |
d63d1b5e | 614 | int mode; |
8ed8d3c3 JA |
615 | }; |
616 | ||
fbf23849 JA |
617 | struct io_cancel { |
618 | struct file *file; | |
619 | u64 addr; | |
8e29da69 | 620 | u32 flags; |
4bf94615 | 621 | s32 fd; |
fbf23849 JA |
622 | }; |
623 | ||
b29472ee JA |
624 | struct io_timeout { |
625 | struct file *file; | |
bfe68a22 PB |
626 | u32 off; |
627 | u32 target_seq; | |
135fcde8 | 628 | struct list_head list; |
90cd7e42 PB |
629 | /* head of the link, used by linked timeouts only */ |
630 | struct io_kiocb *head; | |
89b263f6 JA |
631 | /* for linked completions */ |
632 | struct io_kiocb *prev; | |
b29472ee JA |
633 | }; |
634 | ||
0bdf7a2d PB |
635 | struct io_timeout_rem { |
636 | struct file *file; | |
637 | u64 addr; | |
9c8e11b3 PB |
638 | |
639 | /* timeout update */ | |
640 | struct timespec64 ts; | |
641 | u32 flags; | |
f1042b6c | 642 | bool ltimeout; |
0bdf7a2d PB |
643 | }; |
644 | ||
9adbd45d JA |
645 | struct io_rw { |
646 | /* NOTE: kiocb has the file as the first member, so don't do it here */ | |
647 | struct kiocb kiocb; | |
648 | u64 addr; | |
584b0180 | 649 | u32 len; |
20cbd21d | 650 | rwf_t flags; |
9adbd45d JA |
651 | }; |
652 | ||
3fbb51c1 JA |
653 | struct io_connect { |
654 | struct file *file; | |
655 | struct sockaddr __user *addr; | |
656 | int addr_len; | |
657 | }; | |
658 | ||
e47293fd JA |
659 | struct io_sr_msg { |
660 | struct file *file; | |
fddaface | 661 | union { |
4af3417a PB |
662 | struct compat_msghdr __user *umsg_compat; |
663 | struct user_msghdr __user *umsg; | |
664 | void __user *buf; | |
fddaface | 665 | }; |
e47293fd | 666 | int msg_flags; |
fddaface | 667 | size_t len; |
7ba89d2a | 668 | size_t done_io; |
0455d4cc | 669 | unsigned int flags; |
e47293fd JA |
670 | }; |
671 | ||
15b71abe JA |
672 | struct io_open { |
673 | struct file *file; | |
674 | int dfd; | |
b9445598 | 675 | u32 file_slot; |
15b71abe | 676 | struct filename *filename; |
c12cedf2 | 677 | struct open_how how; |
4022e7af | 678 | unsigned long nofile; |
15b71abe JA |
679 | }; |
680 | ||
269bbe5f | 681 | struct io_rsrc_update { |
05f3fb3c JA |
682 | struct file *file; |
683 | u64 arg; | |
684 | u32 nr_args; | |
685 | u32 offset; | |
686 | }; | |
687 | ||
4840e418 JA |
688 | struct io_fadvise { |
689 | struct file *file; | |
690 | u64 offset; | |
691 | u32 len; | |
692 | u32 advice; | |
693 | }; | |
694 | ||
c1ca757b JA |
695 | struct io_madvise { |
696 | struct file *file; | |
697 | u64 addr; | |
698 | u32 len; | |
699 | u32 advice; | |
700 | }; | |
701 | ||
3e4827b0 JA |
702 | struct io_epoll { |
703 | struct file *file; | |
704 | int epfd; | |
705 | int op; | |
706 | int fd; | |
707 | struct epoll_event event; | |
e47293fd JA |
708 | }; |
709 | ||
7d67af2c PB |
710 | struct io_splice { |
711 | struct file *file_out; | |
7d67af2c PB |
712 | loff_t off_out; |
713 | loff_t off_in; | |
714 | u64 len; | |
a3e4bc23 | 715 | int splice_fd_in; |
7d67af2c PB |
716 | unsigned int flags; |
717 | }; | |
718 | ||
ddf0322d JA |
719 | struct io_provide_buf { |
720 | struct file *file; | |
721 | __u64 addr; | |
38134ada | 722 | __u32 len; |
ddf0322d JA |
723 | __u32 bgid; |
724 | __u16 nbufs; | |
725 | __u16 bid; | |
726 | }; | |
727 | ||
1d9e1288 BM |
728 | struct io_statx { |
729 | struct file *file; | |
730 | int dfd; | |
731 | unsigned int mask; | |
732 | unsigned int flags; | |
1b6fe6e0 | 733 | struct filename *filename; |
1d9e1288 BM |
734 | struct statx __user *buffer; |
735 | }; | |
736 | ||
36f4fa68 JA |
737 | struct io_shutdown { |
738 | struct file *file; | |
739 | int how; | |
740 | }; | |
741 | ||
80a261fd JA |
742 | struct io_rename { |
743 | struct file *file; | |
744 | int old_dfd; | |
745 | int new_dfd; | |
746 | struct filename *oldpath; | |
747 | struct filename *newpath; | |
748 | int flags; | |
749 | }; | |
750 | ||
14a1143b JA |
751 | struct io_unlink { |
752 | struct file *file; | |
753 | int dfd; | |
754 | int flags; | |
755 | struct filename *filename; | |
756 | }; | |
757 | ||
e34a02dc DK |
758 | struct io_mkdir { |
759 | struct file *file; | |
760 | int dfd; | |
761 | umode_t mode; | |
762 | struct filename *filename; | |
763 | }; | |
764 | ||
7a8721f8 DK |
765 | struct io_symlink { |
766 | struct file *file; | |
767 | int new_dfd; | |
768 | struct filename *oldpath; | |
769 | struct filename *newpath; | |
770 | }; | |
771 | ||
cf30da90 DK |
772 | struct io_hardlink { |
773 | struct file *file; | |
774 | int old_dfd; | |
775 | int new_dfd; | |
776 | struct filename *oldpath; | |
777 | struct filename *newpath; | |
778 | int flags; | |
779 | }; | |
780 | ||
4f57f06c JA |
781 | struct io_msg { |
782 | struct file *file; | |
783 | u64 user_data; | |
784 | u32 len; | |
785 | }; | |
786 | ||
2bb04df7 SR |
787 | struct io_nop { |
788 | struct file *file; | |
789 | u64 extra1; | |
790 | u64 extra2; | |
791 | }; | |
792 | ||
f499a021 JA |
793 | struct io_async_connect { |
794 | struct sockaddr_storage address; | |
795 | }; | |
796 | ||
03b1230c JA |
797 | struct io_async_msghdr { |
798 | struct iovec fast_iov[UIO_FASTIOV]; | |
257e84a5 PB |
799 | /* points to an allocated iov, if NULL we use fast_iov instead */ |
800 | struct iovec *free_iov; | |
03b1230c JA |
801 | struct sockaddr __user *uaddr; |
802 | struct msghdr msg; | |
b537916c | 803 | struct sockaddr_storage addr; |
03b1230c JA |
804 | }; |
805 | ||
538941e2 | 806 | struct io_rw_state { |
ff6165b2 | 807 | struct iov_iter iter; |
cd658695 | 808 | struct iov_iter_state iter_state; |
c88598a9 | 809 | struct iovec fast_iov[UIO_FASTIOV]; |
538941e2 PB |
810 | }; |
811 | ||
812 | struct io_async_rw { | |
813 | struct io_rw_state s; | |
814 | const struct iovec *free_iovec; | |
227c0c96 | 815 | size_t bytes_done; |
bcf5a063 | 816 | struct wait_page_queue wpq; |
f67676d1 JA |
817 | }; |
818 | ||
e9621e2b SR |
819 | struct io_xattr { |
820 | struct file *file; | |
821 | struct xattr_ctx ctx; | |
822 | struct filename *filename; | |
823 | }; | |
824 | ||
6b47ee6e PB |
825 | enum { |
826 | REQ_F_FIXED_FILE_BIT = IOSQE_FIXED_FILE_BIT, | |
827 | REQ_F_IO_DRAIN_BIT = IOSQE_IO_DRAIN_BIT, | |
828 | REQ_F_LINK_BIT = IOSQE_IO_LINK_BIT, | |
829 | REQ_F_HARDLINK_BIT = IOSQE_IO_HARDLINK_BIT, | |
830 | REQ_F_FORCE_ASYNC_BIT = IOSQE_ASYNC_BIT, | |
bcda7baa | 831 | REQ_F_BUFFER_SELECT_BIT = IOSQE_BUFFER_SELECT_BIT, |
04c76b41 | 832 | REQ_F_CQE_SKIP_BIT = IOSQE_CQE_SKIP_SUCCESS_BIT, |
6b47ee6e | 833 | |
dddca226 | 834 | /* first byte is taken by user flags, shift it to not overlap */ |
93d2bcd2 | 835 | REQ_F_FAIL_BIT = 8, |
6b47ee6e PB |
836 | REQ_F_INFLIGHT_BIT, |
837 | REQ_F_CUR_POS_BIT, | |
838 | REQ_F_NOWAIT_BIT, | |
6b47ee6e | 839 | REQ_F_LINK_TIMEOUT_BIT, |
99bc4c38 | 840 | REQ_F_NEED_CLEANUP_BIT, |
d7718a9d | 841 | REQ_F_POLLED_BIT, |
bcda7baa | 842 | REQ_F_BUFFER_SELECTED_BIT, |
c7fb1942 | 843 | REQ_F_BUFFER_RING_BIT, |
e342c807 | 844 | REQ_F_COMPLETE_INLINE_BIT, |
230d50d4 | 845 | REQ_F_REISSUE_BIT, |
b8e64b53 | 846 | REQ_F_CREDS_BIT, |
20e60a38 | 847 | REQ_F_REFCOUNT_BIT, |
4d13d1a4 | 848 | REQ_F_ARM_LTIMEOUT_BIT, |
d886e185 | 849 | REQ_F_ASYNC_DATA_BIT, |
04c76b41 | 850 | REQ_F_SKIP_LINK_CQES_BIT, |
91eac1c6 JA |
851 | REQ_F_SINGLE_POLL_BIT, |
852 | REQ_F_DOUBLE_POLL_BIT, | |
8a3e8ee5 | 853 | REQ_F_PARTIAL_IO_BIT, |
227685eb | 854 | REQ_F_APOLL_MULTISHOT_BIT, |
7b29f92d | 855 | /* keep async read/write and isreg together and in order */ |
35645ac3 | 856 | REQ_F_SUPPORT_NOWAIT_BIT, |
7b29f92d | 857 | REQ_F_ISREG_BIT, |
84557871 JA |
858 | |
859 | /* not a real bit, just to check we're not overflowing the space */ | |
860 | __REQ_F_LAST_BIT, | |
6b47ee6e PB |
861 | }; |
862 | ||
863 | enum { | |
864 | /* ctx owns file */ | |
865 | REQ_F_FIXED_FILE = BIT(REQ_F_FIXED_FILE_BIT), | |
866 | /* drain existing IO first */ | |
867 | REQ_F_IO_DRAIN = BIT(REQ_F_IO_DRAIN_BIT), | |
868 | /* linked sqes */ | |
869 | REQ_F_LINK = BIT(REQ_F_LINK_BIT), | |
870 | /* doesn't sever on completion < 0 */ | |
871 | REQ_F_HARDLINK = BIT(REQ_F_HARDLINK_BIT), | |
872 | /* IOSQE_ASYNC */ | |
873 | REQ_F_FORCE_ASYNC = BIT(REQ_F_FORCE_ASYNC_BIT), | |
bcda7baa JA |
874 | /* IOSQE_BUFFER_SELECT */ |
875 | REQ_F_BUFFER_SELECT = BIT(REQ_F_BUFFER_SELECT_BIT), | |
04c76b41 PB |
876 | /* IOSQE_CQE_SKIP_SUCCESS */ |
877 | REQ_F_CQE_SKIP = BIT(REQ_F_CQE_SKIP_BIT), | |
6b47ee6e | 878 | |
6b47ee6e | 879 | /* fail rest of links */ |
93d2bcd2 | 880 | REQ_F_FAIL = BIT(REQ_F_FAIL_BIT), |
b05a1bcd | 881 | /* on inflight list, should be cancelled and waited on exit reliably */ |
6b47ee6e PB |
882 | REQ_F_INFLIGHT = BIT(REQ_F_INFLIGHT_BIT), |
883 | /* read/write uses file position */ | |
884 | REQ_F_CUR_POS = BIT(REQ_F_CUR_POS_BIT), | |
885 | /* must not punt to workers */ | |
886 | REQ_F_NOWAIT = BIT(REQ_F_NOWAIT_BIT), | |
900fad45 | 887 | /* has or had linked timeout */ |
6b47ee6e | 888 | REQ_F_LINK_TIMEOUT = BIT(REQ_F_LINK_TIMEOUT_BIT), |
99bc4c38 PB |
889 | /* needs cleanup */ |
890 | REQ_F_NEED_CLEANUP = BIT(REQ_F_NEED_CLEANUP_BIT), | |
d7718a9d JA |
891 | /* already went through poll handler */ |
892 | REQ_F_POLLED = BIT(REQ_F_POLLED_BIT), | |
bcda7baa JA |
893 | /* buffer already selected */ |
894 | REQ_F_BUFFER_SELECTED = BIT(REQ_F_BUFFER_SELECTED_BIT), | |
c7fb1942 JA |
895 | /* buffer selected from ring, needs commit */ |
896 | REQ_F_BUFFER_RING = BIT(REQ_F_BUFFER_RING_BIT), | |
e342c807 PB |
897 | /* completion is deferred through io_comp_state */ |
898 | REQ_F_COMPLETE_INLINE = BIT(REQ_F_COMPLETE_INLINE_BIT), | |
230d50d4 JA |
899 | /* caller should reissue async */ |
900 | REQ_F_REISSUE = BIT(REQ_F_REISSUE_BIT), | |
35645ac3 PB |
901 | /* supports async reads/writes */ |
902 | REQ_F_SUPPORT_NOWAIT = BIT(REQ_F_SUPPORT_NOWAIT_BIT), | |
7b29f92d JA |
903 | /* regular file */ |
904 | REQ_F_ISREG = BIT(REQ_F_ISREG_BIT), | |
b8e64b53 PB |
905 | /* has creds assigned */ |
906 | REQ_F_CREDS = BIT(REQ_F_CREDS_BIT), | |
20e60a38 PB |
907 | /* skip refcounting if not set */ |
908 | REQ_F_REFCOUNT = BIT(REQ_F_REFCOUNT_BIT), | |
4d13d1a4 PB |
909 | /* there is a linked timeout that has to be armed */ |
910 | REQ_F_ARM_LTIMEOUT = BIT(REQ_F_ARM_LTIMEOUT_BIT), | |
d886e185 PB |
911 | /* ->async_data allocated */ |
912 | REQ_F_ASYNC_DATA = BIT(REQ_F_ASYNC_DATA_BIT), | |
04c76b41 PB |
913 | /* don't post CQEs while failing linked requests */ |
914 | REQ_F_SKIP_LINK_CQES = BIT(REQ_F_SKIP_LINK_CQES_BIT), | |
91eac1c6 JA |
915 | /* single poll may be active */ |
916 | REQ_F_SINGLE_POLL = BIT(REQ_F_SINGLE_POLL_BIT), | |
917 | /* double poll may active */ | |
918 | REQ_F_DOUBLE_POLL = BIT(REQ_F_DOUBLE_POLL_BIT), | |
8a3e8ee5 JA |
919 | /* request has already done partial IO */ |
920 | REQ_F_PARTIAL_IO = BIT(REQ_F_PARTIAL_IO_BIT), | |
227685eb HX |
921 | /* fast poll multishot mode */ |
922 | REQ_F_APOLL_MULTISHOT = BIT(REQ_F_APOLL_MULTISHOT_BIT), | |
d7718a9d JA |
923 | }; |
924 | ||
925 | struct async_poll { | |
926 | struct io_poll_iocb poll; | |
807abcb0 | 927 | struct io_poll_iocb *double_poll; |
6b47ee6e PB |
928 | }; |
929 | ||
f237c30a | 930 | typedef void (*io_req_tw_func_t)(struct io_kiocb *req, bool *locked); |
5b0a6acc | 931 | |
7cbf1722 | 932 | struct io_task_work { |
5b0a6acc PB |
933 | union { |
934 | struct io_wq_work_node node; | |
935 | struct llist_node fallback_node; | |
936 | }; | |
937 | io_req_tw_func_t func; | |
7cbf1722 JA |
938 | }; |
939 | ||
992da01a PB |
940 | enum { |
941 | IORING_RSRC_FILE = 0, | |
942 | IORING_RSRC_BUFFER = 1, | |
943 | }; | |
944 | ||
cef216fc PB |
945 | struct io_cqe { |
946 | __u64 user_data; | |
947 | __s32 res; | |
948 | /* fd initially, then cflags for completion */ | |
949 | union { | |
950 | __u32 flags; | |
951 | int fd; | |
952 | }; | |
953 | }; | |
954 | ||
10988a0a DY |
955 | enum { |
956 | IO_CHECK_CQ_OVERFLOW_BIT, | |
155bc950 | 957 | IO_CHECK_CQ_DROPPED_BIT, |
10988a0a DY |
958 | }; |
959 | ||
09bb8394 JA |
960 | /* |
961 | * NOTE! Each of the iocb union members has the file pointer | |
962 | * as the first entry in their struct definition. So you can | |
963 | * access the file pointer through any of the sub-structs, | |
63c36549 | 964 | * or directly as just 'file' in this struct. |
09bb8394 | 965 | */ |
2b188cc1 | 966 | struct io_kiocb { |
221c5eb2 | 967 | union { |
09bb8394 | 968 | struct file *file; |
9adbd45d | 969 | struct io_rw rw; |
221c5eb2 | 970 | struct io_poll_iocb poll; |
9d805892 | 971 | struct io_poll_update poll_update; |
8ed8d3c3 JA |
972 | struct io_accept accept; |
973 | struct io_sync sync; | |
fbf23849 | 974 | struct io_cancel cancel; |
b29472ee | 975 | struct io_timeout timeout; |
0bdf7a2d | 976 | struct io_timeout_rem timeout_rem; |
3fbb51c1 | 977 | struct io_connect connect; |
e47293fd | 978 | struct io_sr_msg sr_msg; |
15b71abe | 979 | struct io_open open; |
b5dba59e | 980 | struct io_close close; |
269bbe5f | 981 | struct io_rsrc_update rsrc_update; |
4840e418 | 982 | struct io_fadvise fadvise; |
c1ca757b | 983 | struct io_madvise madvise; |
3e4827b0 | 984 | struct io_epoll epoll; |
7d67af2c | 985 | struct io_splice splice; |
ddf0322d | 986 | struct io_provide_buf pbuf; |
1d9e1288 | 987 | struct io_statx statx; |
36f4fa68 | 988 | struct io_shutdown shutdown; |
80a261fd | 989 | struct io_rename rename; |
14a1143b | 990 | struct io_unlink unlink; |
e34a02dc | 991 | struct io_mkdir mkdir; |
7a8721f8 | 992 | struct io_symlink symlink; |
cf30da90 | 993 | struct io_hardlink hardlink; |
4f57f06c | 994 | struct io_msg msg; |
e9621e2b | 995 | struct io_xattr xattr; |
1374e08e | 996 | struct io_socket sock; |
2bb04df7 | 997 | struct io_nop nop; |
ee692a21 | 998 | struct io_uring_cmd uring_cmd; |
221c5eb2 | 999 | }; |
2b188cc1 | 1000 | |
d625c6ee | 1001 | u8 opcode; |
65a6543d XW |
1002 | /* polled IO has completed */ |
1003 | u8 iopoll_completed; | |
1dbd023e JA |
1004 | /* |
1005 | * Can be either a fixed buffer index, or used with provided buffers. | |
1006 | * For the latter, before issue it points to the buffer group ID, | |
1007 | * and after selection it points to the buffer ID itself. | |
1008 | */ | |
4f4eeba8 | 1009 | u16 buf_index; |
d17e56eb PB |
1010 | unsigned int flags; |
1011 | ||
cef216fc | 1012 | struct io_cqe cqe; |
4f4eeba8 | 1013 | |
010e8e6b | 1014 | struct io_ring_ctx *ctx; |
010e8e6b | 1015 | struct task_struct *task; |
d7718a9d | 1016 | |
c1bdf8ed | 1017 | struct io_rsrc_node *rsrc_node; |
a4f8d94c JA |
1018 | |
1019 | union { | |
1020 | /* store used ubuf, so we can prevent reloading */ | |
1021 | struct io_mapped_ubuf *imu; | |
1022 | ||
1023 | /* stores selected buf, valid IFF REQ_F_BUFFER_SELECTED is set */ | |
1024 | struct io_buffer *kbuf; | |
c7fb1942 JA |
1025 | |
1026 | /* | |
1027 | * stores buffer ID for ring provided buffers, valid IFF | |
1028 | * REQ_F_BUFFER_RING is set. | |
1029 | */ | |
1030 | struct io_buffer_list *buf_list; | |
a4f8d94c | 1031 | }; |
fcb323cc | 1032 | |
2804ecd8 JA |
1033 | union { |
1034 | /* used by request caches, completion batching and iopoll */ | |
1035 | struct io_wq_work_node comp_list; | |
1036 | /* cache ->apoll->events */ | |
58f5c8d3 | 1037 | __poll_t apoll_events; |
2804ecd8 | 1038 | }; |
d17e56eb | 1039 | atomic_t refs; |
521d61fc | 1040 | atomic_t poll_refs; |
5b0a6acc | 1041 | struct io_task_work io_task_work; |
010e8e6b | 1042 | /* for polled requests, i.e. IORING_OP_POLL_ADD and async armed poll */ |
4e5bc0a9 SR |
1043 | union { |
1044 | struct hlist_node hash_node; | |
1045 | struct { | |
1046 | u64 extra1; | |
1047 | u64 extra2; | |
1048 | }; | |
1049 | }; | |
7e3709d5 | 1050 | /* internal polling, see IORING_FEAT_FAST_POLL */ |
010e8e6b | 1051 | struct async_poll *apoll; |
d886e185 PB |
1052 | /* opcode allocated if it needs to store data for async defer */ |
1053 | void *async_data; | |
41cdcc22 | 1054 | /* linked requests, IFF REQ_F_HARDLINK or REQ_F_LINK are set */ |
34d2bfe7 | 1055 | struct io_kiocb *link; |
41cdcc22 | 1056 | /* custom credentials, valid IFF REQ_F_CREDS is set */ |
521d61fc JA |
1057 | const struct cred *creds; |
1058 | struct io_wq_work work; | |
2b188cc1 | 1059 | }; |
05589553 | 1060 | |
13bf43f5 PB |
1061 | struct io_tctx_node { |
1062 | struct list_head ctx_node; | |
1063 | struct task_struct *task; | |
13bf43f5 PB |
1064 | struct io_ring_ctx *ctx; |
1065 | }; | |
1066 | ||
27dc8338 PB |
1067 | struct io_defer_entry { |
1068 | struct list_head list; | |
1069 | struct io_kiocb *req; | |
9cf7c104 | 1070 | u32 seq; |
2b188cc1 JA |
1071 | }; |
1072 | ||
b21432b4 JA |
1073 | struct io_cancel_data { |
1074 | struct io_ring_ctx *ctx; | |
4bf94615 JA |
1075 | union { |
1076 | u64 data; | |
1077 | struct file *file; | |
1078 | }; | |
8e29da69 JA |
1079 | u32 flags; |
1080 | int seq; | |
b21432b4 JA |
1081 | }; |
1082 | ||
ee692a21 JA |
1083 | /* |
1084 | * The URING_CMD payload starts at 'cmd' in the first sqe, and continues into | |
1085 | * the following sqe if SQE128 is used. | |
1086 | */ | |
1087 | #define uring_cmd_pdu_size(is_sqe128) \ | |
1088 | ((1 + !!(is_sqe128)) * sizeof(struct io_uring_sqe) - \ | |
1089 | offsetof(struct io_uring_sqe, cmd)) | |
1090 | ||
d3656344 | 1091 | struct io_op_def { |
d3656344 JA |
1092 | /* needs req->file assigned */ |
1093 | unsigned needs_file : 1; | |
6d63416d PB |
1094 | /* should block plug */ |
1095 | unsigned plug : 1; | |
d3656344 JA |
1096 | /* hash wq insertion if file is a regular file */ |
1097 | unsigned hash_reg_file : 1; | |
1098 | /* unbound wq insertion if file is a non-regular file */ | |
1099 | unsigned unbound_nonreg_file : 1; | |
8a72758c JA |
1100 | /* set if opcode supports polled "wait" */ |
1101 | unsigned pollin : 1; | |
1102 | unsigned pollout : 1; | |
52dd8640 | 1103 | unsigned poll_exclusive : 1; |
bcda7baa JA |
1104 | /* op supports buffer selection */ |
1105 | unsigned buffer_select : 1; | |
26f0505a PB |
1106 | /* do prep async if is going to be punted */ |
1107 | unsigned needs_async_setup : 1; | |
6d63416d PB |
1108 | /* opcode is not supported by this kernel */ |
1109 | unsigned not_supported : 1; | |
5bd2182d PM |
1110 | /* skip auditing */ |
1111 | unsigned audit_skip : 1; | |
73911426 JA |
1112 | /* supports ioprio */ |
1113 | unsigned ioprio : 1; | |
1114 | /* supports iopoll */ | |
1115 | unsigned iopoll : 1; | |
e8c2bc1f JA |
1116 | /* size of async data needed, if any */ |
1117 | unsigned short async_size; | |
d3656344 JA |
1118 | }; |
1119 | ||
0918682b | 1120 | static const struct io_op_def io_op_defs[] = { |
73911426 JA |
1121 | [IORING_OP_NOP] = { |
1122 | .audit_skip = 1, | |
1123 | .iopoll = 1, | |
3d200242 | 1124 | .buffer_select = 1, |
73911426 | 1125 | }, |
0463b6c5 | 1126 | [IORING_OP_READV] = { |
d3656344 JA |
1127 | .needs_file = 1, |
1128 | .unbound_nonreg_file = 1, | |
8a72758c | 1129 | .pollin = 1, |
4d954c25 | 1130 | .buffer_select = 1, |
26f0505a | 1131 | .needs_async_setup = 1, |
27926b68 | 1132 | .plug = 1, |
5bd2182d | 1133 | .audit_skip = 1, |
73911426 JA |
1134 | .ioprio = 1, |
1135 | .iopoll = 1, | |
e8c2bc1f | 1136 | .async_size = sizeof(struct io_async_rw), |
d3656344 | 1137 | }, |
0463b6c5 | 1138 | [IORING_OP_WRITEV] = { |
d3656344 JA |
1139 | .needs_file = 1, |
1140 | .hash_reg_file = 1, | |
1141 | .unbound_nonreg_file = 1, | |
8a72758c | 1142 | .pollout = 1, |
26f0505a | 1143 | .needs_async_setup = 1, |
27926b68 | 1144 | .plug = 1, |
5bd2182d | 1145 | .audit_skip = 1, |
73911426 JA |
1146 | .ioprio = 1, |
1147 | .iopoll = 1, | |
e8c2bc1f | 1148 | .async_size = sizeof(struct io_async_rw), |
d3656344 | 1149 | }, |
0463b6c5 | 1150 | [IORING_OP_FSYNC] = { |
d3656344 | 1151 | .needs_file = 1, |
5bd2182d | 1152 | .audit_skip = 1, |
d3656344 | 1153 | }, |
0463b6c5 | 1154 | [IORING_OP_READ_FIXED] = { |
d3656344 JA |
1155 | .needs_file = 1, |
1156 | .unbound_nonreg_file = 1, | |
8a72758c | 1157 | .pollin = 1, |
27926b68 | 1158 | .plug = 1, |
5bd2182d | 1159 | .audit_skip = 1, |
73911426 JA |
1160 | .ioprio = 1, |
1161 | .iopoll = 1, | |
e8c2bc1f | 1162 | .async_size = sizeof(struct io_async_rw), |
d3656344 | 1163 | }, |
0463b6c5 | 1164 | [IORING_OP_WRITE_FIXED] = { |
d3656344 JA |
1165 | .needs_file = 1, |
1166 | .hash_reg_file = 1, | |
1167 | .unbound_nonreg_file = 1, | |
8a72758c | 1168 | .pollout = 1, |
27926b68 | 1169 | .plug = 1, |
5bd2182d | 1170 | .audit_skip = 1, |
73911426 JA |
1171 | .ioprio = 1, |
1172 | .iopoll = 1, | |
e8c2bc1f | 1173 | .async_size = sizeof(struct io_async_rw), |
d3656344 | 1174 | }, |
0463b6c5 | 1175 | [IORING_OP_POLL_ADD] = { |
d3656344 JA |
1176 | .needs_file = 1, |
1177 | .unbound_nonreg_file = 1, | |
5bd2182d PM |
1178 | .audit_skip = 1, |
1179 | }, | |
1180 | [IORING_OP_POLL_REMOVE] = { | |
1181 | .audit_skip = 1, | |
d3656344 | 1182 | }, |
0463b6c5 | 1183 | [IORING_OP_SYNC_FILE_RANGE] = { |
d3656344 | 1184 | .needs_file = 1, |
5bd2182d | 1185 | .audit_skip = 1, |
d3656344 | 1186 | }, |
0463b6c5 | 1187 | [IORING_OP_SENDMSG] = { |
d3656344 JA |
1188 | .needs_file = 1, |
1189 | .unbound_nonreg_file = 1, | |
8a72758c | 1190 | .pollout = 1, |
26f0505a | 1191 | .needs_async_setup = 1, |
e8c2bc1f | 1192 | .async_size = sizeof(struct io_async_msghdr), |
d3656344 | 1193 | }, |
0463b6c5 | 1194 | [IORING_OP_RECVMSG] = { |
d3656344 JA |
1195 | .needs_file = 1, |
1196 | .unbound_nonreg_file = 1, | |
8a72758c | 1197 | .pollin = 1, |
52de1fe1 | 1198 | .buffer_select = 1, |
26f0505a | 1199 | .needs_async_setup = 1, |
e8c2bc1f | 1200 | .async_size = sizeof(struct io_async_msghdr), |
d3656344 | 1201 | }, |
0463b6c5 | 1202 | [IORING_OP_TIMEOUT] = { |
5bd2182d | 1203 | .audit_skip = 1, |
e8c2bc1f | 1204 | .async_size = sizeof(struct io_timeout_data), |
d3656344 | 1205 | }, |
9c8e11b3 PB |
1206 | [IORING_OP_TIMEOUT_REMOVE] = { |
1207 | /* used by timeout updates' prep() */ | |
5bd2182d | 1208 | .audit_skip = 1, |
9c8e11b3 | 1209 | }, |
0463b6c5 | 1210 | [IORING_OP_ACCEPT] = { |
d3656344 JA |
1211 | .needs_file = 1, |
1212 | .unbound_nonreg_file = 1, | |
8a72758c | 1213 | .pollin = 1, |
52dd8640 | 1214 | .poll_exclusive = 1, |
4e86a2c9 | 1215 | .ioprio = 1, /* used for flags */ |
d3656344 | 1216 | }, |
5bd2182d PM |
1217 | [IORING_OP_ASYNC_CANCEL] = { |
1218 | .audit_skip = 1, | |
1219 | }, | |
0463b6c5 | 1220 | [IORING_OP_LINK_TIMEOUT] = { |
5bd2182d | 1221 | .audit_skip = 1, |
e8c2bc1f | 1222 | .async_size = sizeof(struct io_timeout_data), |
d3656344 | 1223 | }, |
0463b6c5 | 1224 | [IORING_OP_CONNECT] = { |
d3656344 JA |
1225 | .needs_file = 1, |
1226 | .unbound_nonreg_file = 1, | |
8a72758c | 1227 | .pollout = 1, |
26f0505a | 1228 | .needs_async_setup = 1, |
e8c2bc1f | 1229 | .async_size = sizeof(struct io_async_connect), |
d3656344 | 1230 | }, |
0463b6c5 | 1231 | [IORING_OP_FALLOCATE] = { |
d3656344 | 1232 | .needs_file = 1, |
d3656344 | 1233 | }, |
44526bed JA |
1234 | [IORING_OP_OPENAT] = {}, |
1235 | [IORING_OP_CLOSE] = {}, | |
5bd2182d PM |
1236 | [IORING_OP_FILES_UPDATE] = { |
1237 | .audit_skip = 1, | |
73911426 | 1238 | .iopoll = 1, |
5bd2182d PM |
1239 | }, |
1240 | [IORING_OP_STATX] = { | |
1241 | .audit_skip = 1, | |
1242 | }, | |
0463b6c5 | 1243 | [IORING_OP_READ] = { |
3a6820f2 JA |
1244 | .needs_file = 1, |
1245 | .unbound_nonreg_file = 1, | |
8a72758c | 1246 | .pollin = 1, |
bcda7baa | 1247 | .buffer_select = 1, |
27926b68 | 1248 | .plug = 1, |
5bd2182d | 1249 | .audit_skip = 1, |
73911426 JA |
1250 | .ioprio = 1, |
1251 | .iopoll = 1, | |
e8c2bc1f | 1252 | .async_size = sizeof(struct io_async_rw), |
3a6820f2 | 1253 | }, |
0463b6c5 | 1254 | [IORING_OP_WRITE] = { |
3a6820f2 | 1255 | .needs_file = 1, |
7b3188e7 | 1256 | .hash_reg_file = 1, |
3a6820f2 | 1257 | .unbound_nonreg_file = 1, |
8a72758c | 1258 | .pollout = 1, |
27926b68 | 1259 | .plug = 1, |
5bd2182d | 1260 | .audit_skip = 1, |
73911426 JA |
1261 | .ioprio = 1, |
1262 | .iopoll = 1, | |
e8c2bc1f | 1263 | .async_size = sizeof(struct io_async_rw), |
3a6820f2 | 1264 | }, |
0463b6c5 | 1265 | [IORING_OP_FADVISE] = { |
4840e418 | 1266 | .needs_file = 1, |
5bd2182d | 1267 | .audit_skip = 1, |
c1ca757b | 1268 | }, |
44526bed | 1269 | [IORING_OP_MADVISE] = {}, |
0463b6c5 | 1270 | [IORING_OP_SEND] = { |
fddaface JA |
1271 | .needs_file = 1, |
1272 | .unbound_nonreg_file = 1, | |
8a72758c | 1273 | .pollout = 1, |
5bd2182d | 1274 | .audit_skip = 1, |
fddaface | 1275 | }, |
0463b6c5 | 1276 | [IORING_OP_RECV] = { |
fddaface JA |
1277 | .needs_file = 1, |
1278 | .unbound_nonreg_file = 1, | |
8a72758c | 1279 | .pollin = 1, |
bcda7baa | 1280 | .buffer_select = 1, |
5bd2182d | 1281 | .audit_skip = 1, |
fddaface | 1282 | }, |
0463b6c5 | 1283 | [IORING_OP_OPENAT2] = { |
cebdb986 | 1284 | }, |
3e4827b0 JA |
1285 | [IORING_OP_EPOLL_CTL] = { |
1286 | .unbound_nonreg_file = 1, | |
5bd2182d | 1287 | .audit_skip = 1, |
3e4827b0 | 1288 | }, |
7d67af2c PB |
1289 | [IORING_OP_SPLICE] = { |
1290 | .needs_file = 1, | |
1291 | .hash_reg_file = 1, | |
1292 | .unbound_nonreg_file = 1, | |
5bd2182d PM |
1293 | .audit_skip = 1, |
1294 | }, | |
1295 | [IORING_OP_PROVIDE_BUFFERS] = { | |
1296 | .audit_skip = 1, | |
73911426 | 1297 | .iopoll = 1, |
5bd2182d PM |
1298 | }, |
1299 | [IORING_OP_REMOVE_BUFFERS] = { | |
1300 | .audit_skip = 1, | |
73911426 | 1301 | .iopoll = 1, |
ddf0322d | 1302 | }, |
f2a8d5c7 PB |
1303 | [IORING_OP_TEE] = { |
1304 | .needs_file = 1, | |
1305 | .hash_reg_file = 1, | |
1306 | .unbound_nonreg_file = 1, | |
5bd2182d | 1307 | .audit_skip = 1, |
f2a8d5c7 | 1308 | }, |
36f4fa68 JA |
1309 | [IORING_OP_SHUTDOWN] = { |
1310 | .needs_file = 1, | |
1311 | }, | |
44526bed JA |
1312 | [IORING_OP_RENAMEAT] = {}, |
1313 | [IORING_OP_UNLINKAT] = {}, | |
e34a02dc | 1314 | [IORING_OP_MKDIRAT] = {}, |
7a8721f8 | 1315 | [IORING_OP_SYMLINKAT] = {}, |
cf30da90 | 1316 | [IORING_OP_LINKAT] = {}, |
4f57f06c JA |
1317 | [IORING_OP_MSG_RING] = { |
1318 | .needs_file = 1, | |
73911426 | 1319 | .iopoll = 1, |
4f57f06c | 1320 | }, |
e9621e2b SR |
1321 | [IORING_OP_FSETXATTR] = { |
1322 | .needs_file = 1 | |
1323 | }, | |
1324 | [IORING_OP_SETXATTR] = {}, | |
a56834e0 SR |
1325 | [IORING_OP_FGETXATTR] = { |
1326 | .needs_file = 1 | |
1327 | }, | |
1328 | [IORING_OP_GETXATTR] = {}, | |
1374e08e JA |
1329 | [IORING_OP_SOCKET] = { |
1330 | .audit_skip = 1, | |
1331 | }, | |
ee692a21 JA |
1332 | [IORING_OP_URING_CMD] = { |
1333 | .needs_file = 1, | |
1334 | .plug = 1, | |
1335 | .needs_async_setup = 1, | |
1336 | .async_size = uring_cmd_pdu_size(1), | |
1337 | }, | |
d3656344 JA |
1338 | }; |
1339 | ||
0756a869 PB |
1340 | /* requests with any of those set should undergo io_disarm_next() */ |
1341 | #define IO_DISARM_MASK (REQ_F_ARM_LTIMEOUT | REQ_F_LINK_TIMEOUT | REQ_F_FAIL) | |
da1a08c5 | 1342 | #define IO_REQ_LINK_FLAGS (REQ_F_LINK | REQ_F_HARDLINK) |
0756a869 | 1343 | |
7a612350 | 1344 | static bool io_disarm_next(struct io_kiocb *req); |
eef51daa | 1345 | static void io_uring_del_tctx_node(unsigned long index); |
9936c7c2 PB |
1346 | static void io_uring_try_cancel_requests(struct io_ring_ctx *ctx, |
1347 | struct task_struct *task, | |
3dd0c97a | 1348 | bool cancel_all); |
78cc687b | 1349 | static void io_uring_cancel_generic(bool cancel_all, struct io_sq_data *sqd); |
1ffc5422 | 1350 | |
4e118cd9 | 1351 | static void __io_req_complete_post(struct io_kiocb *req, s32 res, u32 cflags); |
c7dae4ba | 1352 | static void io_dismantle_req(struct io_kiocb *req); |
94ae5e77 | 1353 | static void io_queue_linked_timeout(struct io_kiocb *req); |
fdecb662 | 1354 | static int __io_register_rsrc_update(struct io_ring_ctx *ctx, unsigned type, |
c3bdad02 | 1355 | struct io_uring_rsrc_update2 *up, |
98f0b3b4 | 1356 | unsigned nr_args); |
68fb8979 | 1357 | static void io_clean_op(struct io_kiocb *req); |
5106dd6e JA |
1358 | static inline struct file *io_file_get_fixed(struct io_kiocb *req, int fd, |
1359 | unsigned issue_flags); | |
ee67ba3b | 1360 | static struct file *io_file_get_normal(struct io_kiocb *req, int fd); |
cbc2e203 | 1361 | static void io_queue_sqe(struct io_kiocb *req); |
269bbe5f | 1362 | static void io_rsrc_put_work(struct work_struct *work); |
de0617e4 | 1363 | |
907d1df3 | 1364 | static void io_req_task_queue(struct io_kiocb *req); |
c450178d | 1365 | static void __io_submit_flush_completions(struct io_ring_ctx *ctx); |
179ae0d1 | 1366 | static int io_req_prep_async(struct io_kiocb *req); |
de0617e4 | 1367 | |
b9445598 PB |
1368 | static int io_install_fixed_file(struct io_kiocb *req, struct file *file, |
1369 | unsigned int issue_flags, u32 slot_index); | |
a7c41b46 XW |
1370 | static int __io_close_fixed(struct io_kiocb *req, unsigned int issue_flags, |
1371 | unsigned int offset); | |
1372 | static inline int io_close_fixed(struct io_kiocb *req, unsigned int issue_flags); | |
7df778be | 1373 | |
f1042b6c | 1374 | static enum hrtimer_restart io_link_timeout_fn(struct hrtimer *timer); |
9aa8dfde | 1375 | static void io_eventfd_signal(struct io_ring_ctx *ctx); |
4e118cd9 | 1376 | static void io_req_tw_post_queue(struct io_kiocb *req, s32 res, u32 cflags); |
b9445598 | 1377 | |
2b188cc1 JA |
1378 | static struct kmem_cache *req_cachep; |
1379 | ||
0918682b | 1380 | static const struct file_operations io_uring_fops; |
2b188cc1 | 1381 | |
33337d03 DY |
1382 | const char *io_uring_get_opcode(u8 opcode) |
1383 | { | |
1384 | switch ((enum io_uring_op)opcode) { | |
1385 | case IORING_OP_NOP: | |
1386 | return "NOP"; | |
1387 | case IORING_OP_READV: | |
1388 | return "READV"; | |
1389 | case IORING_OP_WRITEV: | |
1390 | return "WRITEV"; | |
1391 | case IORING_OP_FSYNC: | |
1392 | return "FSYNC"; | |
1393 | case IORING_OP_READ_FIXED: | |
1394 | return "READ_FIXED"; | |
1395 | case IORING_OP_WRITE_FIXED: | |
1396 | return "WRITE_FIXED"; | |
1397 | case IORING_OP_POLL_ADD: | |
1398 | return "POLL_ADD"; | |
1399 | case IORING_OP_POLL_REMOVE: | |
1400 | return "POLL_REMOVE"; | |
1401 | case IORING_OP_SYNC_FILE_RANGE: | |
1402 | return "SYNC_FILE_RANGE"; | |
1403 | case IORING_OP_SENDMSG: | |
1404 | return "SENDMSG"; | |
1405 | case IORING_OP_RECVMSG: | |
1406 | return "RECVMSG"; | |
1407 | case IORING_OP_TIMEOUT: | |
1408 | return "TIMEOUT"; | |
1409 | case IORING_OP_TIMEOUT_REMOVE: | |
1410 | return "TIMEOUT_REMOVE"; | |
1411 | case IORING_OP_ACCEPT: | |
1412 | return "ACCEPT"; | |
1413 | case IORING_OP_ASYNC_CANCEL: | |
1414 | return "ASYNC_CANCEL"; | |
1415 | case IORING_OP_LINK_TIMEOUT: | |
1416 | return "LINK_TIMEOUT"; | |
1417 | case IORING_OP_CONNECT: | |
1418 | return "CONNECT"; | |
1419 | case IORING_OP_FALLOCATE: | |
1420 | return "FALLOCATE"; | |
1421 | case IORING_OP_OPENAT: | |
1422 | return "OPENAT"; | |
1423 | case IORING_OP_CLOSE: | |
1424 | return "CLOSE"; | |
1425 | case IORING_OP_FILES_UPDATE: | |
1426 | return "FILES_UPDATE"; | |
1427 | case IORING_OP_STATX: | |
1428 | return "STATX"; | |
1429 | case IORING_OP_READ: | |
1430 | return "READ"; | |
1431 | case IORING_OP_WRITE: | |
1432 | return "WRITE"; | |
1433 | case IORING_OP_FADVISE: | |
1434 | return "FADVISE"; | |
1435 | case IORING_OP_MADVISE: | |
1436 | return "MADVISE"; | |
1437 | case IORING_OP_SEND: | |
1438 | return "SEND"; | |
1439 | case IORING_OP_RECV: | |
1440 | return "RECV"; | |
1441 | case IORING_OP_OPENAT2: | |
1442 | return "OPENAT2"; | |
1443 | case IORING_OP_EPOLL_CTL: | |
1444 | return "EPOLL_CTL"; | |
1445 | case IORING_OP_SPLICE: | |
1446 | return "SPLICE"; | |
1447 | case IORING_OP_PROVIDE_BUFFERS: | |
1448 | return "PROVIDE_BUFFERS"; | |
1449 | case IORING_OP_REMOVE_BUFFERS: | |
1450 | return "REMOVE_BUFFERS"; | |
1451 | case IORING_OP_TEE: | |
1452 | return "TEE"; | |
1453 | case IORING_OP_SHUTDOWN: | |
1454 | return "SHUTDOWN"; | |
1455 | case IORING_OP_RENAMEAT: | |
1456 | return "RENAMEAT"; | |
1457 | case IORING_OP_UNLINKAT: | |
1458 | return "UNLINKAT"; | |
1459 | case IORING_OP_MKDIRAT: | |
1460 | return "MKDIRAT"; | |
1461 | case IORING_OP_SYMLINKAT: | |
1462 | return "SYMLINKAT"; | |
1463 | case IORING_OP_LINKAT: | |
1464 | return "LINKAT"; | |
1465 | case IORING_OP_MSG_RING: | |
1466 | return "MSG_RING"; | |
1467 | case IORING_OP_FSETXATTR: | |
1468 | return "FSETXATTR"; | |
1469 | case IORING_OP_SETXATTR: | |
1470 | return "SETXATTR"; | |
1471 | case IORING_OP_FGETXATTR: | |
1472 | return "FGETXATTR"; | |
1473 | case IORING_OP_GETXATTR: | |
1474 | return "GETXATTR"; | |
1475 | case IORING_OP_SOCKET: | |
1476 | return "SOCKET"; | |
ee692a21 JA |
1477 | case IORING_OP_URING_CMD: |
1478 | return "URING_CMD"; | |
33337d03 DY |
1479 | case IORING_OP_LAST: |
1480 | return "INVALID"; | |
1481 | } | |
1482 | return "INVALID"; | |
1483 | } | |
1484 | ||
2b188cc1 JA |
1485 | struct sock *io_uring_get_socket(struct file *file) |
1486 | { | |
1487 | #if defined(CONFIG_UNIX) | |
1488 | if (file->f_op == &io_uring_fops) { | |
1489 | struct io_ring_ctx *ctx = file->private_data; | |
1490 | ||
1491 | return ctx->ring_sock->sk; | |
1492 | } | |
1493 | #endif | |
1494 | return NULL; | |
1495 | } | |
1496 | EXPORT_SYMBOL(io_uring_get_socket); | |
1497 | ||
1f59bc0f PB |
1498 | #if defined(CONFIG_UNIX) |
1499 | static inline bool io_file_need_scm(struct file *filp) | |
1500 | { | |
5e45690a JA |
1501 | #if defined(IO_URING_SCM_ALL) |
1502 | return true; | |
1503 | #else | |
1f59bc0f | 1504 | return !!unix_get_socket(filp); |
5e45690a | 1505 | #endif |
1f59bc0f PB |
1506 | } |
1507 | #else | |
1508 | static inline bool io_file_need_scm(struct file *filp) | |
1509 | { | |
5e45690a | 1510 | return false; |
1f59bc0f PB |
1511 | } |
1512 | #endif | |
1513 | ||
f8929630 PB |
1514 | static void io_ring_submit_unlock(struct io_ring_ctx *ctx, unsigned issue_flags) |
1515 | { | |
1516 | lockdep_assert_held(&ctx->uring_lock); | |
1517 | if (issue_flags & IO_URING_F_UNLOCKED) | |
1518 | mutex_unlock(&ctx->uring_lock); | |
1519 | } | |
1520 | ||
1521 | static void io_ring_submit_lock(struct io_ring_ctx *ctx, unsigned issue_flags) | |
1522 | { | |
1523 | /* | |
1524 | * "Normal" inline submissions always hold the uring_lock, since we | |
1525 | * grab it from the system call. Same is true for the SQPOLL offload. | |
1526 | * The only exception is when we've detached the request and issue it | |
1527 | * from an async worker thread, grab the lock for that case. | |
1528 | */ | |
1529 | if (issue_flags & IO_URING_F_UNLOCKED) | |
1530 | mutex_lock(&ctx->uring_lock); | |
1531 | lockdep_assert_held(&ctx->uring_lock); | |
1532 | } | |
1533 | ||
f237c30a PB |
1534 | static inline void io_tw_lock(struct io_ring_ctx *ctx, bool *locked) |
1535 | { | |
1536 | if (!*locked) { | |
1537 | mutex_lock(&ctx->uring_lock); | |
1538 | *locked = true; | |
1539 | } | |
1540 | } | |
1541 | ||
f2f87370 PB |
1542 | #define io_for_each_link(pos, head) \ |
1543 | for (pos = (head); pos; pos = pos->link) | |
1544 | ||
21c843d5 PB |
1545 | /* |
1546 | * Shamelessly stolen from the mm implementation of page reference checking, | |
1547 | * see commit f958d7b528b1 for details. | |
1548 | */ | |
1549 | #define req_ref_zero_or_close_to_overflow(req) \ | |
1550 | ((unsigned int) atomic_read(&(req->refs)) + 127u <= 127u) | |
1551 | ||
1552 | static inline bool req_ref_inc_not_zero(struct io_kiocb *req) | |
1553 | { | |
20e60a38 | 1554 | WARN_ON_ONCE(!(req->flags & REQ_F_REFCOUNT)); |
21c843d5 PB |
1555 | return atomic_inc_not_zero(&req->refs); |
1556 | } | |
1557 | ||
21c843d5 PB |
1558 | static inline bool req_ref_put_and_test(struct io_kiocb *req) |
1559 | { | |
20e60a38 PB |
1560 | if (likely(!(req->flags & REQ_F_REFCOUNT))) |
1561 | return true; | |
1562 | ||
21c843d5 PB |
1563 | WARN_ON_ONCE(req_ref_zero_or_close_to_overflow(req)); |
1564 | return atomic_dec_and_test(&req->refs); | |
1565 | } | |
1566 | ||
21c843d5 PB |
1567 | static inline void req_ref_get(struct io_kiocb *req) |
1568 | { | |
20e60a38 | 1569 | WARN_ON_ONCE(!(req->flags & REQ_F_REFCOUNT)); |
21c843d5 PB |
1570 | WARN_ON_ONCE(req_ref_zero_or_close_to_overflow(req)); |
1571 | atomic_inc(&req->refs); | |
1572 | } | |
1573 | ||
c450178d PB |
1574 | static inline void io_submit_flush_completions(struct io_ring_ctx *ctx) |
1575 | { | |
6f33b0bc | 1576 | if (!wq_list_empty(&ctx->submit_state.compl_reqs)) |
c450178d PB |
1577 | __io_submit_flush_completions(ctx); |
1578 | } | |
1579 | ||
48dcd38d | 1580 | static inline void __io_req_set_refcount(struct io_kiocb *req, int nr) |
20e60a38 PB |
1581 | { |
1582 | if (!(req->flags & REQ_F_REFCOUNT)) { | |
1583 | req->flags |= REQ_F_REFCOUNT; | |
48dcd38d | 1584 | atomic_set(&req->refs, nr); |
20e60a38 PB |
1585 | } |
1586 | } | |
1587 | ||
48dcd38d PB |
1588 | static inline void io_req_set_refcount(struct io_kiocb *req) |
1589 | { | |
1590 | __io_req_set_refcount(req, 1); | |
1591 | } | |
1592 | ||
ab409402 PB |
1593 | #define IO_RSRC_REF_BATCH 100 |
1594 | ||
25a15d3c PB |
1595 | static void io_rsrc_put_node(struct io_rsrc_node *node, int nr) |
1596 | { | |
1597 | percpu_ref_put_many(&node->refs, nr); | |
1598 | } | |
1599 | ||
ab409402 PB |
1600 | static inline void io_req_put_rsrc_locked(struct io_kiocb *req, |
1601 | struct io_ring_ctx *ctx) | |
1602 | __must_hold(&ctx->uring_lock) | |
36f72fe2 | 1603 | { |
c1bdf8ed | 1604 | struct io_rsrc_node *node = req->rsrc_node; |
ab409402 | 1605 | |
c1bdf8ed PB |
1606 | if (node) { |
1607 | if (node == ctx->rsrc_node) | |
ab409402 PB |
1608 | ctx->rsrc_cached_refs++; |
1609 | else | |
25a15d3c | 1610 | io_rsrc_put_node(node, 1); |
ab409402 PB |
1611 | } |
1612 | } | |
1613 | ||
7ac1edc4 | 1614 | static inline void io_req_put_rsrc(struct io_kiocb *req) |
ab409402 | 1615 | { |
c1bdf8ed | 1616 | if (req->rsrc_node) |
25a15d3c | 1617 | io_rsrc_put_node(req->rsrc_node, 1); |
ab409402 PB |
1618 | } |
1619 | ||
1620 | static __cold void io_rsrc_refs_drop(struct io_ring_ctx *ctx) | |
1621 | __must_hold(&ctx->uring_lock) | |
1622 | { | |
1623 | if (ctx->rsrc_cached_refs) { | |
25a15d3c | 1624 | io_rsrc_put_node(ctx->rsrc_node, ctx->rsrc_cached_refs); |
ab409402 PB |
1625 | ctx->rsrc_cached_refs = 0; |
1626 | } | |
1627 | } | |
1628 | ||
1629 | static void io_rsrc_refs_refill(struct io_ring_ctx *ctx) | |
1630 | __must_hold(&ctx->uring_lock) | |
1631 | { | |
1632 | ctx->rsrc_cached_refs += IO_RSRC_REF_BATCH; | |
1633 | percpu_ref_get_many(&ctx->rsrc_node->refs, IO_RSRC_REF_BATCH); | |
1634 | } | |
36f72fe2 | 1635 | |
a46be971 | 1636 | static inline void io_req_set_rsrc_node(struct io_kiocb *req, |
5106dd6e JA |
1637 | struct io_ring_ctx *ctx, |
1638 | unsigned int issue_flags) | |
36f72fe2 | 1639 | { |
c1bdf8ed PB |
1640 | if (!req->rsrc_node) { |
1641 | req->rsrc_node = ctx->rsrc_node; | |
5106dd6e JA |
1642 | |
1643 | if (!(issue_flags & IO_URING_F_UNLOCKED)) { | |
1644 | lockdep_assert_held(&ctx->uring_lock); | |
1645 | ctx->rsrc_cached_refs--; | |
1646 | if (unlikely(ctx->rsrc_cached_refs < 0)) | |
1647 | io_rsrc_refs_refill(ctx); | |
1648 | } else { | |
c1bdf8ed | 1649 | percpu_ref_get(&req->rsrc_node->refs); |
5106dd6e | 1650 | } |
36f72fe2 PB |
1651 | } |
1652 | } | |
1653 | ||
cc3cec83 | 1654 | static unsigned int __io_put_kbuf(struct io_kiocb *req, struct list_head *list) |
3648e526 | 1655 | { |
c7fb1942 JA |
1656 | if (req->flags & REQ_F_BUFFER_RING) { |
1657 | if (req->buf_list) | |
1658 | req->buf_list->head++; | |
1659 | req->flags &= ~REQ_F_BUFFER_RING; | |
1660 | } else { | |
1661 | list_add(&req->kbuf->list, list); | |
1662 | req->flags &= ~REQ_F_BUFFER_SELECTED; | |
1663 | } | |
3648e526 | 1664 | |
1dbd023e | 1665 | return IORING_CQE_F_BUFFER | (req->buf_index << IORING_CQE_BUFFER_SHIFT); |
3648e526 HX |
1666 | } |
1667 | ||
cc3cec83 | 1668 | static inline unsigned int io_put_kbuf_comp(struct io_kiocb *req) |
3648e526 | 1669 | { |
8197b053 PB |
1670 | lockdep_assert_held(&req->ctx->completion_lock); |
1671 | ||
c7fb1942 | 1672 | if (!(req->flags & (REQ_F_BUFFER_SELECTED|REQ_F_BUFFER_RING))) |
3648e526 | 1673 | return 0; |
cc3cec83 JA |
1674 | return __io_put_kbuf(req, &req->ctx->io_buffers_comp); |
1675 | } | |
1676 | ||
1677 | static inline unsigned int io_put_kbuf(struct io_kiocb *req, | |
1678 | unsigned issue_flags) | |
1679 | { | |
1680 | unsigned int cflags; | |
1681 | ||
c7fb1942 | 1682 | if (!(req->flags & (REQ_F_BUFFER_SELECTED|REQ_F_BUFFER_RING))) |
cc3cec83 JA |
1683 | return 0; |
1684 | ||
1685 | /* | |
1686 | * We can add this buffer back to two lists: | |
1687 | * | |
1688 | * 1) The io_buffers_cache list. This one is protected by the | |
1689 | * ctx->uring_lock. If we already hold this lock, add back to this | |
1690 | * list as we can grab it from issue as well. | |
1691 | * 2) The io_buffers_comp list. This one is protected by the | |
1692 | * ctx->completion_lock. | |
1693 | * | |
1694 | * We migrate buffers from the comp_list to the issue cache list | |
1695 | * when we need one. | |
1696 | */ | |
c7fb1942 JA |
1697 | if (req->flags & REQ_F_BUFFER_RING) { |
1698 | /* no buffers to recycle for this case */ | |
1699 | cflags = __io_put_kbuf(req, NULL); | |
1700 | } else if (issue_flags & IO_URING_F_UNLOCKED) { | |
cc3cec83 JA |
1701 | struct io_ring_ctx *ctx = req->ctx; |
1702 | ||
1703 | spin_lock(&ctx->completion_lock); | |
1704 | cflags = __io_put_kbuf(req, &ctx->io_buffers_comp); | |
1705 | spin_unlock(&ctx->completion_lock); | |
1706 | } else { | |
ab0ac095 PB |
1707 | lockdep_assert_held(&req->ctx->uring_lock); |
1708 | ||
cc3cec83 JA |
1709 | cflags = __io_put_kbuf(req, &req->ctx->io_buffers_cache); |
1710 | } | |
1711 | ||
1712 | return cflags; | |
3648e526 HX |
1713 | } |
1714 | ||
dbc7d452 JA |
1715 | static struct io_buffer_list *io_buffer_get_list(struct io_ring_ctx *ctx, |
1716 | unsigned int bgid) | |
1717 | { | |
9cfc7e94 JA |
1718 | if (ctx->io_bl && bgid < BGID_ARRAY) |
1719 | return &ctx->io_bl[bgid]; | |
dbc7d452 | 1720 | |
9cfc7e94 | 1721 | return xa_load(&ctx->io_bl_xa, bgid); |
dbc7d452 JA |
1722 | } |
1723 | ||
4d55f238 | 1724 | static void io_kbuf_recycle(struct io_kiocb *req, unsigned issue_flags) |
b1c62645 JA |
1725 | { |
1726 | struct io_ring_ctx *ctx = req->ctx; | |
dbc7d452 JA |
1727 | struct io_buffer_list *bl; |
1728 | struct io_buffer *buf; | |
b1c62645 | 1729 | |
c7fb1942 | 1730 | if (!(req->flags & (REQ_F_BUFFER_SELECTED|REQ_F_BUFFER_RING))) |
b1c62645 | 1731 | return; |
8a3e8ee5 JA |
1732 | /* don't recycle if we already did IO to this buffer */ |
1733 | if (req->flags & REQ_F_PARTIAL_IO) | |
1734 | return; | |
c7fb1942 JA |
1735 | /* |
1736 | * We don't need to recycle for REQ_F_BUFFER_RING, we can just clear | |
1737 | * the flag and hence ensure that bl->head doesn't get incremented. | |
1738 | * If the tail has already been incremented, hang on to it. | |
1739 | */ | |
1740 | if (req->flags & REQ_F_BUFFER_RING) { | |
1741 | if (req->buf_list) { | |
1742 | req->buf_index = req->buf_list->bgid; | |
1743 | req->flags &= ~REQ_F_BUFFER_RING; | |
1744 | } | |
1745 | return; | |
1746 | } | |
b1c62645 | 1747 | |
f8929630 | 1748 | io_ring_submit_lock(ctx, issue_flags); |
b1c62645 JA |
1749 | |
1750 | buf = req->kbuf; | |
dbc7d452 JA |
1751 | bl = io_buffer_get_list(ctx, buf->bgid); |
1752 | list_add(&buf->list, &bl->buf_list); | |
b1c62645 | 1753 | req->flags &= ~REQ_F_BUFFER_SELECTED; |
1dbd023e | 1754 | req->buf_index = buf->bgid; |
4d55f238 | 1755 | |
f8929630 | 1756 | io_ring_submit_unlock(ctx, issue_flags); |
b1c62645 JA |
1757 | } |
1758 | ||
3dd0c97a PB |
1759 | static bool io_match_task(struct io_kiocb *head, struct task_struct *task, |
1760 | bool cancel_all) | |
6af3f48b | 1761 | __must_hold(&req->ctx->timeout_lock) |
08d23634 | 1762 | { |
9cae36a0 JA |
1763 | struct io_kiocb *req; |
1764 | ||
68207680 | 1765 | if (task && head->task != task) |
08d23634 | 1766 | return false; |
9cae36a0 JA |
1767 | if (cancel_all) |
1768 | return true; | |
1769 | ||
1770 | io_for_each_link(req, head) { | |
1771 | if (req->flags & REQ_F_INFLIGHT) | |
1772 | return true; | |
1773 | } | |
1774 | return false; | |
1775 | } | |
1776 | ||
1777 | static bool io_match_linked(struct io_kiocb *head) | |
1778 | { | |
1779 | struct io_kiocb *req; | |
1780 | ||
1781 | io_for_each_link(req, head) { | |
1782 | if (req->flags & REQ_F_INFLIGHT) | |
1783 | return true; | |
1784 | } | |
1785 | return false; | |
6af3f48b PB |
1786 | } |
1787 | ||
1788 | /* | |
1789 | * As io_match_task() but protected against racing with linked timeouts. | |
1790 | * User must not hold timeout_lock. | |
1791 | */ | |
1792 | static bool io_match_task_safe(struct io_kiocb *head, struct task_struct *task, | |
1793 | bool cancel_all) | |
1794 | { | |
9cae36a0 JA |
1795 | bool matched; |
1796 | ||
6af3f48b PB |
1797 | if (task && head->task != task) |
1798 | return false; | |
9cae36a0 JA |
1799 | if (cancel_all) |
1800 | return true; | |
1801 | ||
1802 | if (head->flags & REQ_F_LINK_TIMEOUT) { | |
1803 | struct io_ring_ctx *ctx = head->ctx; | |
1804 | ||
1805 | /* protect against races with linked timeouts */ | |
1806 | spin_lock_irq(&ctx->timeout_lock); | |
1807 | matched = io_match_linked(head); | |
1808 | spin_unlock_irq(&ctx->timeout_lock); | |
1809 | } else { | |
1810 | matched = io_match_linked(head); | |
1811 | } | |
1812 | return matched; | |
6af3f48b PB |
1813 | } |
1814 | ||
d886e185 PB |
1815 | static inline bool req_has_async_data(struct io_kiocb *req) |
1816 | { | |
1817 | return req->flags & REQ_F_ASYNC_DATA; | |
1818 | } | |
1819 | ||
93d2bcd2 | 1820 | static inline void req_set_fail(struct io_kiocb *req) |
c40f6379 | 1821 | { |
93d2bcd2 | 1822 | req->flags |= REQ_F_FAIL; |
04c76b41 PB |
1823 | if (req->flags & REQ_F_CQE_SKIP) { |
1824 | req->flags &= ~REQ_F_CQE_SKIP; | |
1825 | req->flags |= REQ_F_SKIP_LINK_CQES; | |
1826 | } | |
c40f6379 | 1827 | } |
4a38aed2 | 1828 | |
a8295b98 HX |
1829 | static inline void req_fail_link_node(struct io_kiocb *req, int res) |
1830 | { | |
1831 | req_set_fail(req); | |
cef216fc | 1832 | req->cqe.res = res; |
a8295b98 HX |
1833 | } |
1834 | ||
fa05457a PB |
1835 | static inline void io_req_add_to_cache(struct io_kiocb *req, struct io_ring_ctx *ctx) |
1836 | { | |
1837 | wq_stack_add_head(&req->comp_list, &ctx->submit_state.free_list); | |
a8295b98 HX |
1838 | } |
1839 | ||
c072481d | 1840 | static __cold void io_ring_ctx_ref_free(struct percpu_ref *ref) |
2b188cc1 JA |
1841 | { |
1842 | struct io_ring_ctx *ctx = container_of(ref, struct io_ring_ctx, refs); | |
1843 | ||
0f158b4c | 1844 | complete(&ctx->ref_comp); |
2b188cc1 JA |
1845 | } |
1846 | ||
8eb7e2d0 PB |
1847 | static inline bool io_is_timeout_noseq(struct io_kiocb *req) |
1848 | { | |
1849 | return !req->timeout.off; | |
1850 | } | |
1851 | ||
c072481d | 1852 | static __cold void io_fallback_req_func(struct work_struct *work) |
f56165e6 PB |
1853 | { |
1854 | struct io_ring_ctx *ctx = container_of(work, struct io_ring_ctx, | |
1855 | fallback_work.work); | |
1856 | struct llist_node *node = llist_del_all(&ctx->fallback_llist); | |
1857 | struct io_kiocb *req, *tmp; | |
f237c30a | 1858 | bool locked = false; |
f56165e6 PB |
1859 | |
1860 | percpu_ref_get(&ctx->refs); | |
1861 | llist_for_each_entry_safe(req, tmp, node, io_task_work.fallback_node) | |
f237c30a | 1862 | req->io_task_work.func(req, &locked); |
5636c00d | 1863 | |
f237c30a | 1864 | if (locked) { |
c450178d | 1865 | io_submit_flush_completions(ctx); |
f237c30a PB |
1866 | mutex_unlock(&ctx->uring_lock); |
1867 | } | |
f56165e6 PB |
1868 | percpu_ref_put(&ctx->refs); |
1869 | } | |
1870 | ||
c072481d | 1871 | static __cold struct io_ring_ctx *io_ring_ctx_alloc(struct io_uring_params *p) |
2b188cc1 JA |
1872 | { |
1873 | struct io_ring_ctx *ctx; | |
9cfc7e94 | 1874 | int hash_bits; |
2b188cc1 JA |
1875 | |
1876 | ctx = kzalloc(sizeof(*ctx), GFP_KERNEL); | |
1877 | if (!ctx) | |
1878 | return NULL; | |
1879 | ||
9cfc7e94 JA |
1880 | xa_init(&ctx->io_bl_xa); |
1881 | ||
78076bb6 JA |
1882 | /* |
1883 | * Use 5 bits less than the max cq entries, that should give us around | |
1884 | * 32 entries per hash list if totally full and uniformly spread. | |
1885 | */ | |
1886 | hash_bits = ilog2(p->cq_entries); | |
1887 | hash_bits -= 5; | |
1888 | if (hash_bits <= 0) | |
1889 | hash_bits = 1; | |
1890 | ctx->cancel_hash_bits = hash_bits; | |
1891 | ctx->cancel_hash = kmalloc((1U << hash_bits) * sizeof(struct hlist_head), | |
1892 | GFP_KERNEL); | |
1893 | if (!ctx->cancel_hash) | |
1894 | goto err; | |
1895 | __hash_init(ctx->cancel_hash, 1U << hash_bits); | |
1896 | ||
6224843d PB |
1897 | ctx->dummy_ubuf = kzalloc(sizeof(*ctx->dummy_ubuf), GFP_KERNEL); |
1898 | if (!ctx->dummy_ubuf) | |
1899 | goto err; | |
1900 | /* set invalid range, so io_import_fixed() fails meeting it */ | |
1901 | ctx->dummy_ubuf->ubuf = -1UL; | |
1902 | ||
21482896 | 1903 | if (percpu_ref_init(&ctx->refs, io_ring_ctx_ref_free, |
206aefde JA |
1904 | PERCPU_REF_ALLOW_REINIT, GFP_KERNEL)) |
1905 | goto err; | |
2b188cc1 JA |
1906 | |
1907 | ctx->flags = p->flags; | |
90554200 | 1908 | init_waitqueue_head(&ctx->sqo_sq_wait); |
69fb2131 | 1909 | INIT_LIST_HEAD(&ctx->sqd_list); |
1d7bb1d5 | 1910 | INIT_LIST_HEAD(&ctx->cq_overflow_list); |
cc3cec83 | 1911 | INIT_LIST_HEAD(&ctx->io_buffers_cache); |
4d9237e3 | 1912 | INIT_LIST_HEAD(&ctx->apoll_cache); |
0f158b4c | 1913 | init_completion(&ctx->ref_comp); |
61cf9370 | 1914 | xa_init_flags(&ctx->personalities, XA_FLAGS_ALLOC1); |
2b188cc1 | 1915 | mutex_init(&ctx->uring_lock); |
311997b3 | 1916 | init_waitqueue_head(&ctx->cq_wait); |
2b188cc1 | 1917 | spin_lock_init(&ctx->completion_lock); |
89850fce | 1918 | spin_lock_init(&ctx->timeout_lock); |
5eef4e87 | 1919 | INIT_WQ_LIST(&ctx->iopoll_list); |
cc3cec83 JA |
1920 | INIT_LIST_HEAD(&ctx->io_buffers_pages); |
1921 | INIT_LIST_HEAD(&ctx->io_buffers_comp); | |
de0617e4 | 1922 | INIT_LIST_HEAD(&ctx->defer_list); |
5262f567 | 1923 | INIT_LIST_HEAD(&ctx->timeout_list); |
ef9dd637 | 1924 | INIT_LIST_HEAD(&ctx->ltimeout_list); |
d67d2263 BM |
1925 | spin_lock_init(&ctx->rsrc_ref_lock); |
1926 | INIT_LIST_HEAD(&ctx->rsrc_ref_list); | |
269bbe5f BM |
1927 | INIT_DELAYED_WORK(&ctx->rsrc_put_work, io_rsrc_put_work); |
1928 | init_llist_head(&ctx->rsrc_put_llist); | |
13bf43f5 | 1929 | INIT_LIST_HEAD(&ctx->tctx_list); |
c2b6c6bc PB |
1930 | ctx->submit_state.free_list.next = NULL; |
1931 | INIT_WQ_LIST(&ctx->locked_free_list); | |
9011bf9a | 1932 | INIT_DELAYED_WORK(&ctx->fallback_work, io_fallback_req_func); |
6f33b0bc | 1933 | INIT_WQ_LIST(&ctx->submit_state.compl_reqs); |
2b188cc1 | 1934 | return ctx; |
206aefde | 1935 | err: |
6224843d | 1936 | kfree(ctx->dummy_ubuf); |
78076bb6 | 1937 | kfree(ctx->cancel_hash); |
9cfc7e94 JA |
1938 | kfree(ctx->io_bl); |
1939 | xa_destroy(&ctx->io_bl_xa); | |
206aefde JA |
1940 | kfree(ctx); |
1941 | return NULL; | |
2b188cc1 JA |
1942 | } |
1943 | ||
8f6ed49a PB |
1944 | static void io_account_cq_overflow(struct io_ring_ctx *ctx) |
1945 | { | |
1946 | struct io_rings *r = ctx->rings; | |
1947 | ||
1948 | WRITE_ONCE(r->cq_overflow, READ_ONCE(r->cq_overflow) + 1); | |
1949 | ctx->cq_extra--; | |
1950 | } | |
1951 | ||
9cf7c104 | 1952 | static bool req_need_defer(struct io_kiocb *req, u32 seq) |
7adf4eaf | 1953 | { |
2bc9930e JA |
1954 | if (unlikely(req->flags & REQ_F_IO_DRAIN)) { |
1955 | struct io_ring_ctx *ctx = req->ctx; | |
a197f664 | 1956 | |
8f6ed49a | 1957 | return seq + READ_ONCE(ctx->cq_extra) != ctx->cached_cq_tail; |
2bc9930e | 1958 | } |
de0617e4 | 1959 | |
9d858b21 | 1960 | return false; |
de0617e4 JA |
1961 | } |
1962 | ||
c97d8a0f PB |
1963 | static inline bool io_req_ffs_set(struct io_kiocb *req) |
1964 | { | |
35645ac3 | 1965 | return req->flags & REQ_F_FIXED_FILE; |
c97d8a0f PB |
1966 | } |
1967 | ||
9cae36a0 JA |
1968 | static inline void io_req_track_inflight(struct io_kiocb *req) |
1969 | { | |
1970 | if (!(req->flags & REQ_F_INFLIGHT)) { | |
1971 | req->flags |= REQ_F_INFLIGHT; | |
1972 | atomic_inc(¤t->io_uring->inflight_tracked); | |
1973 | } | |
1974 | } | |
1975 | ||
fd08e530 PB |
1976 | static struct io_kiocb *__io_prep_linked_timeout(struct io_kiocb *req) |
1977 | { | |
906c6caa PB |
1978 | if (WARN_ON_ONCE(!req->link)) |
1979 | return NULL; | |
1980 | ||
4d13d1a4 PB |
1981 | req->flags &= ~REQ_F_ARM_LTIMEOUT; |
1982 | req->flags |= REQ_F_LINK_TIMEOUT; | |
fd08e530 PB |
1983 | |
1984 | /* linked timeouts should have two refs once prep'ed */ | |
48dcd38d | 1985 | io_req_set_refcount(req); |
4d13d1a4 PB |
1986 | __io_req_set_refcount(req->link, 2); |
1987 | return req->link; | |
fd08e530 PB |
1988 | } |
1989 | ||
1990 | static inline struct io_kiocb *io_prep_linked_timeout(struct io_kiocb *req) | |
1991 | { | |
4d13d1a4 | 1992 | if (likely(!(req->flags & REQ_F_ARM_LTIMEOUT))) |
fd08e530 PB |
1993 | return NULL; |
1994 | return __io_prep_linked_timeout(req); | |
1995 | } | |
1996 | ||
cb2d344c PB |
1997 | static noinline void __io_arm_ltimeout(struct io_kiocb *req) |
1998 | { | |
1999 | io_queue_linked_timeout(__io_prep_linked_timeout(req)); | |
2000 | } | |
2001 | ||
2002 | static inline void io_arm_ltimeout(struct io_kiocb *req) | |
2003 | { | |
2004 | if (unlikely(req->flags & REQ_F_ARM_LTIMEOUT)) | |
2005 | __io_arm_ltimeout(req); | |
2006 | } | |
2007 | ||
1e6fa521 JA |
2008 | static void io_prep_async_work(struct io_kiocb *req) |
2009 | { | |
2010 | const struct io_op_def *def = &io_op_defs[req->opcode]; | |
1e6fa521 JA |
2011 | struct io_ring_ctx *ctx = req->ctx; |
2012 | ||
b8e64b53 PB |
2013 | if (!(req->flags & REQ_F_CREDS)) { |
2014 | req->flags |= REQ_F_CREDS; | |
c10d1f98 | 2015 | req->creds = get_current_cred(); |
b8e64b53 | 2016 | } |
003e8dcc | 2017 | |
e1d675df PB |
2018 | req->work.list.next = NULL; |
2019 | req->work.flags = 0; | |
8e29da69 | 2020 | req->work.cancel_seq = atomic_read(&ctx->cancel_seq); |
feaadc4f PB |
2021 | if (req->flags & REQ_F_FORCE_ASYNC) |
2022 | req->work.flags |= IO_WQ_WORK_CONCURRENT; | |
2023 | ||
1e6fa521 JA |
2024 | if (req->flags & REQ_F_ISREG) { |
2025 | if (def->hash_reg_file || (ctx->flags & IORING_SETUP_IOPOLL)) | |
2026 | io_wq_hash_work(&req->work, file_inode(req->file)); | |
4b982bd0 | 2027 | } else if (!req->file || !S_ISBLK(file_inode(req->file)->i_mode)) { |
1e6fa521 JA |
2028 | if (def->unbound_nonreg_file) |
2029 | req->work.flags |= IO_WQ_WORK_UNBOUND; | |
2030 | } | |
561fb04a | 2031 | } |
cccf0ee8 | 2032 | |
cbdcb435 | 2033 | static void io_prep_async_link(struct io_kiocb *req) |
561fb04a | 2034 | { |
cbdcb435 | 2035 | struct io_kiocb *cur; |
54a91f3b | 2036 | |
44eff40a PB |
2037 | if (req->flags & REQ_F_LINK_TIMEOUT) { |
2038 | struct io_ring_ctx *ctx = req->ctx; | |
2039 | ||
674ee8e1 | 2040 | spin_lock_irq(&ctx->timeout_lock); |
44eff40a PB |
2041 | io_for_each_link(cur, req) |
2042 | io_prep_async_work(cur); | |
674ee8e1 | 2043 | spin_unlock_irq(&ctx->timeout_lock); |
44eff40a PB |
2044 | } else { |
2045 | io_for_each_link(cur, req) | |
2046 | io_prep_async_work(cur); | |
2047 | } | |
561fb04a JA |
2048 | } |
2049 | ||
fff4e40e PB |
2050 | static inline void io_req_add_compl_list(struct io_kiocb *req) |
2051 | { | |
775a1f2f | 2052 | struct io_submit_state *state = &req->ctx->submit_state; |
fff4e40e | 2053 | |
3d4aeb9f | 2054 | if (!(req->flags & REQ_F_CQE_SKIP)) |
775a1f2f | 2055 | state->flush_cqes = true; |
fff4e40e PB |
2056 | wq_list_add_tail(&req->comp_list, &state->compl_reqs); |
2057 | } | |
2058 | ||
77955efb | 2059 | static void io_queue_iowq(struct io_kiocb *req, bool *dont_use) |
561fb04a | 2060 | { |
cbdcb435 | 2061 | struct io_kiocb *link = io_prep_linked_timeout(req); |
5aa75ed5 | 2062 | struct io_uring_task *tctx = req->task->io_uring; |
561fb04a | 2063 | |
3bfe6106 JA |
2064 | BUG_ON(!tctx); |
2065 | BUG_ON(!tctx->io_wq); | |
561fb04a | 2066 | |
cbdcb435 PB |
2067 | /* init ->work of the whole link before punting */ |
2068 | io_prep_async_link(req); | |
991468dc JA |
2069 | |
2070 | /* | |
2071 | * Not expected to happen, but if we do have a bug where this _can_ | |
2072 | * happen, catch it here and ensure the request is marked as | |
2073 | * canceled. That will make io-wq go through the usual work cancel | |
2074 | * procedure rather than attempt to run this request (or create a new | |
2075 | * worker for it). | |
2076 | */ | |
2077 | if (WARN_ON_ONCE(!same_thread_group(req->task, current))) | |
2078 | req->work.flags |= IO_WQ_WORK_CANCEL; | |
2079 | ||
971cf9c1 PB |
2080 | trace_io_uring_queue_async_work(req->ctx, req, req->cqe.user_data, |
2081 | req->opcode, req->flags, &req->work, | |
2082 | io_wq_is_hashed(&req->work)); | |
ebf93667 | 2083 | io_wq_enqueue(tctx->io_wq, &req->work); |
7271ef3a JA |
2084 | if (link) |
2085 | io_queue_linked_timeout(link); | |
cbdcb435 PB |
2086 | } |
2087 | ||
1ee4160c | 2088 | static void io_kill_timeout(struct io_kiocb *req, int status) |
8c855885 | 2089 | __must_hold(&req->ctx->completion_lock) |
89850fce | 2090 | __must_hold(&req->ctx->timeout_lock) |
5262f567 | 2091 | { |
e8c2bc1f | 2092 | struct io_timeout_data *io = req->async_data; |
5262f567 | 2093 | |
fd9c7bc5 | 2094 | if (hrtimer_try_to_cancel(&io->timer) != -1) { |
2ae2eb9d PB |
2095 | if (status) |
2096 | req_set_fail(req); | |
01cec8c1 PB |
2097 | atomic_set(&req->ctx->cq_timeouts, |
2098 | atomic_read(&req->ctx->cq_timeouts) + 1); | |
135fcde8 | 2099 | list_del_init(&req->timeout.list); |
4e118cd9 | 2100 | io_req_tw_post_queue(req, status, 0); |
5262f567 JA |
2101 | } |
2102 | } | |
2103 | ||
c072481d | 2104 | static __cold void io_queue_deferred(struct io_ring_ctx *ctx) |
de0617e4 | 2105 | { |
441b8a78 | 2106 | while (!list_empty(&ctx->defer_list)) { |
27dc8338 PB |
2107 | struct io_defer_entry *de = list_first_entry(&ctx->defer_list, |
2108 | struct io_defer_entry, list); | |
de0617e4 | 2109 | |
9cf7c104 | 2110 | if (req_need_defer(de->req, de->seq)) |
04518945 | 2111 | break; |
27dc8338 | 2112 | list_del_init(&de->list); |
907d1df3 | 2113 | io_req_task_queue(de->req); |
27dc8338 | 2114 | kfree(de); |
441b8a78 | 2115 | } |
04518945 PB |
2116 | } |
2117 | ||
c072481d | 2118 | static __cold void io_flush_timeouts(struct io_ring_ctx *ctx) |
89850fce | 2119 | __must_hold(&ctx->completion_lock) |
de0617e4 | 2120 | { |
441b8a78 | 2121 | u32 seq = ctx->cached_cq_tail - atomic_read(&ctx->cq_timeouts); |
e677edbc | 2122 | struct io_kiocb *req, *tmp; |
f010505b | 2123 | |
79ebeaee | 2124 | spin_lock_irq(&ctx->timeout_lock); |
e677edbc | 2125 | list_for_each_entry_safe(req, tmp, &ctx->timeout_list, timeout.list) { |
f010505b | 2126 | u32 events_needed, events_got; |
de0617e4 | 2127 | |
8eb7e2d0 | 2128 | if (io_is_timeout_noseq(req)) |
360428f8 | 2129 | break; |
f010505b MDG |
2130 | |
2131 | /* | |
2132 | * Since seq can easily wrap around over time, subtract | |
2133 | * the last seq at which timeouts were flushed before comparing. | |
2134 | * Assuming not more than 2^31-1 events have happened since, | |
2135 | * these subtractions won't have wrapped, so we can check if | |
2136 | * target is in [last_seq, current_seq] by comparing the two. | |
2137 | */ | |
2138 | events_needed = req->timeout.target_seq - ctx->cq_last_tm_flush; | |
2139 | events_got = seq - ctx->cq_last_tm_flush; | |
2140 | if (events_got < events_needed) | |
360428f8 | 2141 | break; |
bfe68a22 | 2142 | |
1ee4160c | 2143 | io_kill_timeout(req, 0); |
f18ee4cf | 2144 | } |
f010505b | 2145 | ctx->cq_last_tm_flush = seq; |
79ebeaee | 2146 | spin_unlock_irq(&ctx->timeout_lock); |
360428f8 | 2147 | } |
5262f567 | 2148 | |
9333f6b4 PB |
2149 | static inline void io_commit_cqring(struct io_ring_ctx *ctx) |
2150 | { | |
2151 | /* order cqe stores with ring update */ | |
2152 | smp_store_release(&ctx->rings->cq.tail, ctx->cached_cq_tail); | |
2153 | } | |
2154 | ||
9aa8dfde | 2155 | static void __io_commit_cqring_flush(struct io_ring_ctx *ctx) |
360428f8 | 2156 | { |
9aa8dfde PB |
2157 | if (ctx->off_timeout_used || ctx->drain_active) { |
2158 | spin_lock(&ctx->completion_lock); | |
2159 | if (ctx->off_timeout_used) | |
2160 | io_flush_timeouts(ctx); | |
2161 | if (ctx->drain_active) | |
2162 | io_queue_deferred(ctx); | |
2163 | io_commit_cqring(ctx); | |
2164 | spin_unlock(&ctx->completion_lock); | |
2165 | } | |
2166 | if (ctx->has_evfd) | |
2167 | io_eventfd_signal(ctx); | |
de0617e4 JA |
2168 | } |
2169 | ||
90554200 JA |
2170 | static inline bool io_sqring_full(struct io_ring_ctx *ctx) |
2171 | { | |
2172 | struct io_rings *r = ctx->rings; | |
2173 | ||
a566c556 | 2174 | return READ_ONCE(r->sq.tail) - ctx->cached_sq_head == ctx->sq_entries; |
90554200 JA |
2175 | } |
2176 | ||
888aae2e PB |
2177 | static inline unsigned int __io_cqring_events(struct io_ring_ctx *ctx) |
2178 | { | |
2179 | return ctx->cached_cq_tail - READ_ONCE(ctx->rings->cq.head); | |
2180 | } | |
2181 | ||
d8da428b PB |
2182 | /* |
2183 | * writes to the cq entry need to come after reading head; the | |
2184 | * control dependency is enough as we're using WRITE_ONCE to | |
2185 | * fill the cq entry | |
2186 | */ | |
2187 | static noinline struct io_uring_cqe *__io_get_cqe(struct io_ring_ctx *ctx) | |
2b188cc1 | 2188 | { |
75b28aff | 2189 | struct io_rings *rings = ctx->rings; |
d8da428b | 2190 | unsigned int off = ctx->cached_cq_tail & (ctx->cq_entries - 1); |
2fee6bc6 | 2191 | unsigned int shift = 0; |
d8da428b PB |
2192 | unsigned int free, queued, len; |
2193 | ||
2fee6bc6 SR |
2194 | if (ctx->flags & IORING_SETUP_CQE32) |
2195 | shift = 1; | |
2196 | ||
d8da428b PB |
2197 | /* userspace may cheat modifying the tail, be safe and do min */ |
2198 | queued = min(__io_cqring_events(ctx), ctx->cq_entries); | |
2199 | free = ctx->cq_entries - queued; | |
2200 | /* we need a contiguous range, limit based on the current array offset */ | |
2201 | len = min(free, ctx->cq_entries - off); | |
2202 | if (!len) | |
2b188cc1 JA |
2203 | return NULL; |
2204 | ||
d8da428b PB |
2205 | ctx->cached_cq_tail++; |
2206 | ctx->cqe_cached = &rings->cqes[off]; | |
2207 | ctx->cqe_sentinel = ctx->cqe_cached + len; | |
2fee6bc6 SR |
2208 | ctx->cqe_cached++; |
2209 | return &rings->cqes[off << shift]; | |
d8da428b PB |
2210 | } |
2211 | ||
2212 | static inline struct io_uring_cqe *io_get_cqe(struct io_ring_ctx *ctx) | |
2213 | { | |
2214 | if (likely(ctx->cqe_cached < ctx->cqe_sentinel)) { | |
2fee6bc6 SR |
2215 | struct io_uring_cqe *cqe = ctx->cqe_cached; |
2216 | ||
2217 | if (ctx->flags & IORING_SETUP_CQE32) { | |
2218 | unsigned int off = ctx->cqe_cached - ctx->rings->cqes; | |
2219 | ||
2220 | cqe += off; | |
2221 | } | |
2222 | ||
d8da428b | 2223 | ctx->cached_cq_tail++; |
2fee6bc6 SR |
2224 | ctx->cqe_cached++; |
2225 | return cqe; | |
d8da428b | 2226 | } |
2fee6bc6 | 2227 | |
d8da428b | 2228 | return __io_get_cqe(ctx); |
2b188cc1 JA |
2229 | } |
2230 | ||
77bc59b4 | 2231 | static void io_eventfd_signal(struct io_ring_ctx *ctx) |
f2842ab5 | 2232 | { |
77bc59b4 UA |
2233 | struct io_ev_fd *ev_fd; |
2234 | ||
77bc59b4 UA |
2235 | rcu_read_lock(); |
2236 | /* | |
2237 | * rcu_dereference ctx->io_ev_fd once and use it for both for checking | |
2238 | * and eventfd_signal | |
2239 | */ | |
2240 | ev_fd = rcu_dereference(ctx->io_ev_fd); | |
2241 | ||
2242 | /* | |
2243 | * Check again if ev_fd exists incase an io_eventfd_unregister call | |
2244 | * completed between the NULL check of ctx->io_ev_fd at the start of | |
2245 | * the function and rcu_read_lock. | |
2246 | */ | |
2247 | if (unlikely(!ev_fd)) | |
2248 | goto out; | |
7e55a19c | 2249 | if (READ_ONCE(ctx->rings->cq_flags) & IORING_CQ_EVENTFD_DISABLED) |
77bc59b4 UA |
2250 | goto out; |
2251 | ||
c75312dd | 2252 | if (!ev_fd->eventfd_async || io_wq_current_is_worker()) |
77bc59b4 | 2253 | eventfd_signal(ev_fd->cq_ev_fd, 1); |
77bc59b4 UA |
2254 | out: |
2255 | rcu_read_unlock(); | |
f2842ab5 JA |
2256 | } |
2257 | ||
9aa8dfde PB |
2258 | static inline void io_cqring_wake(struct io_ring_ctx *ctx) |
2259 | { | |
2260 | /* | |
2261 | * wake_up_all() may seem excessive, but io_wake_function() and | |
2262 | * io_should_wake() handle the termination of the loop and only | |
2263 | * wake as many waiters as we need to. | |
2264 | */ | |
2265 | if (wq_has_sleeper(&ctx->cq_wait)) | |
2266 | wake_up_all(&ctx->cq_wait); | |
2267 | } | |
2268 | ||
2c5d763c JA |
2269 | /* |
2270 | * This should only get called when at least one event has been posted. | |
2271 | * Some applications rely on the eventfd notification count only changing | |
2272 | * IFF a new CQE has been added to the CQ ring. There's no depedency on | |
2273 | * 1:1 relationship between how many times this function is called (and | |
2274 | * hence the eventfd count) and number of CQEs posted to the CQ ring. | |
2275 | */ | |
66fc25ca | 2276 | static inline void io_cqring_ev_posted(struct io_ring_ctx *ctx) |
1d7bb1d5 | 2277 | { |
9aa8dfde PB |
2278 | if (unlikely(ctx->off_timeout_used || ctx->drain_active || |
2279 | ctx->has_evfd)) | |
9333f6b4 PB |
2280 | __io_commit_cqring_flush(ctx); |
2281 | ||
9aa8dfde | 2282 | io_cqring_wake(ctx); |
1d7bb1d5 JA |
2283 | } |
2284 | ||
80c18e4a PB |
2285 | static void io_cqring_ev_posted_iopoll(struct io_ring_ctx *ctx) |
2286 | { | |
9aa8dfde PB |
2287 | if (unlikely(ctx->off_timeout_used || ctx->drain_active || |
2288 | ctx->has_evfd)) | |
9333f6b4 PB |
2289 | __io_commit_cqring_flush(ctx); |
2290 | ||
9aa8dfde PB |
2291 | if (ctx->flags & IORING_SETUP_SQPOLL) |
2292 | io_cqring_wake(ctx); | |
80c18e4a PB |
2293 | } |
2294 | ||
c4a2ed72 | 2295 | /* Returns true if there are no backlogged entries after the flush */ |
6c2450ae | 2296 | static bool __io_cqring_overflow_flush(struct io_ring_ctx *ctx, bool force) |
1d7bb1d5 | 2297 | { |
b18032bb | 2298 | bool all_flushed, posted; |
e45a3e05 | 2299 | size_t cqe_size = sizeof(struct io_uring_cqe); |
1d7bb1d5 | 2300 | |
a566c556 | 2301 | if (!force && __io_cqring_events(ctx) == ctx->cq_entries) |
e23de15f | 2302 | return false; |
1d7bb1d5 | 2303 | |
e45a3e05 SR |
2304 | if (ctx->flags & IORING_SETUP_CQE32) |
2305 | cqe_size <<= 1; | |
2306 | ||
b18032bb | 2307 | posted = false; |
79ebeaee | 2308 | spin_lock(&ctx->completion_lock); |
6c2450ae | 2309 | while (!list_empty(&ctx->cq_overflow_list)) { |
d068b506 | 2310 | struct io_uring_cqe *cqe = io_get_cqe(ctx); |
6c2450ae | 2311 | struct io_overflow_cqe *ocqe; |
e6c8aa9a | 2312 | |
1d7bb1d5 JA |
2313 | if (!cqe && !force) |
2314 | break; | |
6c2450ae PB |
2315 | ocqe = list_first_entry(&ctx->cq_overflow_list, |
2316 | struct io_overflow_cqe, list); | |
2317 | if (cqe) | |
e45a3e05 | 2318 | memcpy(cqe, &ocqe->cqe, cqe_size); |
6c2450ae | 2319 | else |
8f6ed49a PB |
2320 | io_account_cq_overflow(ctx); |
2321 | ||
b18032bb | 2322 | posted = true; |
6c2450ae PB |
2323 | list_del(&ocqe->list); |
2324 | kfree(ocqe); | |
1d7bb1d5 JA |
2325 | } |
2326 | ||
09e88404 PB |
2327 | all_flushed = list_empty(&ctx->cq_overflow_list); |
2328 | if (all_flushed) { | |
10988a0a | 2329 | clear_bit(IO_CHECK_CQ_OVERFLOW_BIT, &ctx->check_cq); |
3a4b89a2 | 2330 | atomic_andnot(IORING_SQ_CQ_OVERFLOW, &ctx->rings->sq_flags); |
09e88404 | 2331 | } |
46930143 | 2332 | |
60053be8 | 2333 | io_commit_cqring(ctx); |
79ebeaee | 2334 | spin_unlock(&ctx->completion_lock); |
b18032bb JA |
2335 | if (posted) |
2336 | io_cqring_ev_posted(ctx); | |
09e88404 | 2337 | return all_flushed; |
1d7bb1d5 JA |
2338 | } |
2339 | ||
90f67366 | 2340 | static bool io_cqring_overflow_flush(struct io_ring_ctx *ctx) |
6c503150 | 2341 | { |
ca0a2651 JA |
2342 | bool ret = true; |
2343 | ||
10988a0a | 2344 | if (test_bit(IO_CHECK_CQ_OVERFLOW_BIT, &ctx->check_cq)) { |
6c503150 PB |
2345 | /* iopoll syncs against uring_lock, not completion_lock */ |
2346 | if (ctx->flags & IORING_SETUP_IOPOLL) | |
2347 | mutex_lock(&ctx->uring_lock); | |
90f67366 | 2348 | ret = __io_cqring_overflow_flush(ctx, false); |
6c503150 PB |
2349 | if (ctx->flags & IORING_SETUP_IOPOLL) |
2350 | mutex_unlock(&ctx->uring_lock); | |
2351 | } | |
ca0a2651 JA |
2352 | |
2353 | return ret; | |
6c503150 PB |
2354 | } |
2355 | ||
9d170164 | 2356 | static void __io_put_task(struct task_struct *task, int nr) |
6a290a14 PB |
2357 | { |
2358 | struct io_uring_task *tctx = task->io_uring; | |
2359 | ||
9d170164 PB |
2360 | percpu_counter_sub(&tctx->inflight, nr); |
2361 | if (unlikely(atomic_read(&tctx->in_idle))) | |
2362 | wake_up(&tctx->wait); | |
2363 | put_task_struct_many(task, nr); | |
2364 | } | |
2365 | ||
2366 | /* must to be called somewhat shortly after putting a request */ | |
2367 | static inline void io_put_task(struct task_struct *task, int nr) | |
2368 | { | |
2369 | if (likely(task == current)) | |
2370 | task->io_uring->cached_refs += nr; | |
2371 | else | |
2372 | __io_put_task(task, nr); | |
6a290a14 PB |
2373 | } |
2374 | ||
9a10867a PB |
2375 | static void io_task_refs_refill(struct io_uring_task *tctx) |
2376 | { | |
2377 | unsigned int refill = -tctx->cached_refs + IO_TCTX_REFS_CACHE_NR; | |
2378 | ||
2379 | percpu_counter_add(&tctx->inflight, refill); | |
2380 | refcount_add(refill, ¤t->usage); | |
2381 | tctx->cached_refs += refill; | |
2382 | } | |
2383 | ||
2384 | static inline void io_get_task_refs(int nr) | |
2385 | { | |
2386 | struct io_uring_task *tctx = current->io_uring; | |
2387 | ||
2388 | tctx->cached_refs -= nr; | |
2389 | if (unlikely(tctx->cached_refs < 0)) | |
2390 | io_task_refs_refill(tctx); | |
2391 | } | |
2392 | ||
3cc7fdb9 PB |
2393 | static __cold void io_uring_drop_tctx_refs(struct task_struct *task) |
2394 | { | |
2395 | struct io_uring_task *tctx = task->io_uring; | |
2396 | unsigned int refs = tctx->cached_refs; | |
2397 | ||
2398 | if (refs) { | |
2399 | tctx->cached_refs = 0; | |
2400 | percpu_counter_sub(&tctx->inflight, refs); | |
2401 | put_task_struct_many(task, refs); | |
2402 | } | |
2403 | } | |
2404 | ||
d4d19c19 | 2405 | static bool io_cqring_event_overflow(struct io_ring_ctx *ctx, u64 user_data, |
e45a3e05 SR |
2406 | s32 res, u32 cflags, u64 extra1, |
2407 | u64 extra2) | |
2b188cc1 | 2408 | { |
cce4b8b0 | 2409 | struct io_overflow_cqe *ocqe; |
e45a3e05 SR |
2410 | size_t ocq_size = sizeof(struct io_overflow_cqe); |
2411 | bool is_cqe32 = (ctx->flags & IORING_SETUP_CQE32); | |
2b188cc1 | 2412 | |
e45a3e05 SR |
2413 | if (is_cqe32) |
2414 | ocq_size += sizeof(struct io_uring_cqe); | |
2b188cc1 | 2415 | |
e45a3e05 | 2416 | ocqe = kmalloc(ocq_size, GFP_ATOMIC | __GFP_ACCOUNT); |
08dcd028 | 2417 | trace_io_uring_cqe_overflow(ctx, user_data, res, cflags, ocqe); |
cce4b8b0 PB |
2418 | if (!ocqe) { |
2419 | /* | |
2420 | * If we're in ring overflow flush mode, or in task cancel mode, | |
2421 | * or cannot allocate an overflow entry, then we need to drop it | |
2422 | * on the floor. | |
2423 | */ | |
8f6ed49a | 2424 | io_account_cq_overflow(ctx); |
155bc950 | 2425 | set_bit(IO_CHECK_CQ_DROPPED_BIT, &ctx->check_cq); |
cce4b8b0 | 2426 | return false; |
2b188cc1 | 2427 | } |
cce4b8b0 | 2428 | if (list_empty(&ctx->cq_overflow_list)) { |
10988a0a | 2429 | set_bit(IO_CHECK_CQ_OVERFLOW_BIT, &ctx->check_cq); |
3a4b89a2 | 2430 | atomic_or(IORING_SQ_CQ_OVERFLOW, &ctx->rings->sq_flags); |
20c0b380 | 2431 | |
cce4b8b0 | 2432 | } |
d4d19c19 | 2433 | ocqe->cqe.user_data = user_data; |
cce4b8b0 PB |
2434 | ocqe->cqe.res = res; |
2435 | ocqe->cqe.flags = cflags; | |
e45a3e05 SR |
2436 | if (is_cqe32) { |
2437 | ocqe->cqe.big_cqe[0] = extra1; | |
2438 | ocqe->cqe.big_cqe[1] = extra2; | |
2439 | } | |
cce4b8b0 PB |
2440 | list_add_tail(&ocqe->list, &ctx->cq_overflow_list); |
2441 | return true; | |
2b188cc1 JA |
2442 | } |
2443 | ||
ae4da189 | 2444 | static inline bool __io_fill_cqe(struct io_ring_ctx *ctx, u64 user_data, |
913a571a | 2445 | s32 res, u32 cflags) |
2b188cc1 JA |
2446 | { |
2447 | struct io_uring_cqe *cqe; | |
2448 | ||
2449 | /* | |
2450 | * If we can't get a cq entry, userspace overflowed the | |
2451 | * submission (by quite a lot). Increment the overflow count in | |
2452 | * the ring. | |
2453 | */ | |
d068b506 | 2454 | cqe = io_get_cqe(ctx); |
1d7bb1d5 | 2455 | if (likely(cqe)) { |
d4d19c19 | 2456 | WRITE_ONCE(cqe->user_data, user_data); |
2b188cc1 | 2457 | WRITE_ONCE(cqe->res, res); |
bcda7baa | 2458 | WRITE_ONCE(cqe->flags, cflags); |
8d13326e | 2459 | return true; |
2b188cc1 | 2460 | } |
e45a3e05 | 2461 | return io_cqring_event_overflow(ctx, user_data, res, cflags, 0, 0); |
2b188cc1 JA |
2462 | } |
2463 | ||
90e7c35f PB |
2464 | static inline bool __io_fill_cqe_req_filled(struct io_ring_ctx *ctx, |
2465 | struct io_kiocb *req) | |
d5ec1dfa | 2466 | { |
90e7c35f PB |
2467 | struct io_uring_cqe *cqe; |
2468 | ||
2469 | trace_io_uring_complete(req->ctx, req, req->cqe.user_data, | |
c4bb964f | 2470 | req->cqe.res, req->cqe.flags, 0, 0); |
90e7c35f PB |
2471 | |
2472 | /* | |
2473 | * If we can't get a cq entry, userspace overflowed the | |
2474 | * submission (by quite a lot). Increment the overflow count in | |
2475 | * the ring. | |
2476 | */ | |
2477 | cqe = io_get_cqe(ctx); | |
2478 | if (likely(cqe)) { | |
2479 | memcpy(cqe, &req->cqe, sizeof(*cqe)); | |
2480 | return true; | |
2481 | } | |
2482 | return io_cqring_event_overflow(ctx, req->cqe.user_data, | |
e45a3e05 | 2483 | req->cqe.res, req->cqe.flags, 0, 0); |
d5ec1dfa SR |
2484 | } |
2485 | ||
91658798 SR |
2486 | static inline bool __io_fill_cqe32_req_filled(struct io_ring_ctx *ctx, |
2487 | struct io_kiocb *req) | |
2488 | { | |
2489 | struct io_uring_cqe *cqe; | |
2490 | u64 extra1 = req->extra1; | |
2491 | u64 extra2 = req->extra2; | |
2492 | ||
2493 | trace_io_uring_complete(req->ctx, req, req->cqe.user_data, | |
c4bb964f | 2494 | req->cqe.res, req->cqe.flags, extra1, extra2); |
91658798 SR |
2495 | |
2496 | /* | |
2497 | * If we can't get a cq entry, userspace overflowed the | |
2498 | * submission (by quite a lot). Increment the overflow count in | |
2499 | * the ring. | |
2500 | */ | |
2501 | cqe = io_get_cqe(ctx); | |
2502 | if (likely(cqe)) { | |
2503 | memcpy(cqe, &req->cqe, sizeof(struct io_uring_cqe)); | |
2504 | cqe->big_cqe[0] = extra1; | |
2505 | cqe->big_cqe[1] = extra2; | |
2506 | return true; | |
2507 | } | |
2508 | ||
e45a3e05 SR |
2509 | return io_cqring_event_overflow(ctx, req->cqe.user_data, req->cqe.res, |
2510 | req->cqe.flags, extra1, extra2); | |
d5ec1dfa SR |
2511 | } |
2512 | ||
ae4da189 | 2513 | static inline bool __io_fill_cqe_req(struct io_kiocb *req, s32 res, u32 cflags) |
bcda7baa | 2514 | { |
c4bb964f | 2515 | trace_io_uring_complete(req->ctx, req, req->cqe.user_data, res, cflags, 0, 0); |
cef216fc | 2516 | return __io_fill_cqe(req->ctx, req->cqe.user_data, res, cflags); |
bcda7baa JA |
2517 | } |
2518 | ||
91658798 SR |
2519 | static inline void __io_fill_cqe32_req(struct io_kiocb *req, s32 res, u32 cflags, |
2520 | u64 extra1, u64 extra2) | |
2521 | { | |
2522 | struct io_ring_ctx *ctx = req->ctx; | |
2523 | struct io_uring_cqe *cqe; | |
2524 | ||
2525 | if (WARN_ON_ONCE(!(ctx->flags & IORING_SETUP_CQE32))) | |
2526 | return; | |
2527 | if (req->flags & REQ_F_CQE_SKIP) | |
2528 | return; | |
2529 | ||
c4bb964f SR |
2530 | trace_io_uring_complete(ctx, req, req->cqe.user_data, res, cflags, |
2531 | extra1, extra2); | |
91658798 SR |
2532 | |
2533 | /* | |
2534 | * If we can't get a cq entry, userspace overflowed the | |
2535 | * submission (by quite a lot). Increment the overflow count in | |
2536 | * the ring. | |
2537 | */ | |
2538 | cqe = io_get_cqe(ctx); | |
2539 | if (likely(cqe)) { | |
2540 | WRITE_ONCE(cqe->user_data, req->cqe.user_data); | |
2541 | WRITE_ONCE(cqe->res, res); | |
2542 | WRITE_ONCE(cqe->flags, cflags); | |
2543 | WRITE_ONCE(cqe->big_cqe[0], extra1); | |
2544 | WRITE_ONCE(cqe->big_cqe[1], extra2); | |
2545 | return; | |
2546 | } | |
2547 | ||
e45a3e05 | 2548 | io_cqring_event_overflow(ctx, req->cqe.user_data, res, cflags, extra1, extra2); |
91658798 SR |
2549 | } |
2550 | ||
913a571a PB |
2551 | static noinline bool io_fill_cqe_aux(struct io_ring_ctx *ctx, u64 user_data, |
2552 | s32 res, u32 cflags) | |
bcda7baa | 2553 | { |
913a571a | 2554 | ctx->cq_extra++; |
c4bb964f | 2555 | trace_io_uring_complete(ctx, NULL, user_data, res, cflags, 0, 0); |
ae4da189 | 2556 | return __io_fill_cqe(ctx, user_data, res, cflags); |
bcda7baa JA |
2557 | } |
2558 | ||
effcf8bd | 2559 | static void __io_req_complete_put(struct io_kiocb *req) |
2b188cc1 | 2560 | { |
c7dae4ba JA |
2561 | /* |
2562 | * If we're the last reference to this request, add to our locked | |
2563 | * free_list cache. | |
2564 | */ | |
de9b4cca | 2565 | if (req_ref_put_and_test(req)) { |
effcf8bd SR |
2566 | struct io_ring_ctx *ctx = req->ctx; |
2567 | ||
da1a08c5 | 2568 | if (req->flags & IO_REQ_LINK_FLAGS) { |
0756a869 | 2569 | if (req->flags & IO_DISARM_MASK) |
7a612350 PB |
2570 | io_disarm_next(req); |
2571 | if (req->link) { | |
2572 | io_req_task_queue(req->link); | |
2573 | req->link = NULL; | |
2574 | } | |
2575 | } | |
7ac1edc4 | 2576 | io_req_put_rsrc(req); |
8197b053 PB |
2577 | /* |
2578 | * Selected buffer deallocation in io_clean_op() assumes that | |
2579 | * we don't hold ->completion_lock. Clean them here to avoid | |
2580 | * deadlocks. | |
2581 | */ | |
2582 | io_put_kbuf_comp(req); | |
c7dae4ba JA |
2583 | io_dismantle_req(req); |
2584 | io_put_task(req->task, 1); | |
c2b6c6bc | 2585 | wq_list_add_head(&req->comp_list, &ctx->locked_free_list); |
d0acdee2 | 2586 | ctx->locked_free_nr++; |
180f829f | 2587 | } |
a37fae8a HX |
2588 | } |
2589 | ||
effcf8bd SR |
2590 | static void __io_req_complete_post(struct io_kiocb *req, s32 res, |
2591 | u32 cflags) | |
2592 | { | |
2593 | if (!(req->flags & REQ_F_CQE_SKIP)) | |
2594 | __io_fill_cqe_req(req, res, cflags); | |
2595 | __io_req_complete_put(req); | |
2596 | } | |
2597 | ||
2598 | static void __io_req_complete_post32(struct io_kiocb *req, s32 res, | |
2599 | u32 cflags, u64 extra1, u64 extra2) | |
2600 | { | |
2601 | if (!(req->flags & REQ_F_CQE_SKIP)) | |
2602 | __io_fill_cqe32_req(req, res, cflags, extra1, extra2); | |
2603 | __io_req_complete_put(req); | |
2604 | } | |
2605 | ||
2606 | static void io_req_complete_post(struct io_kiocb *req, s32 res, u32 cflags) | |
a37fae8a HX |
2607 | { |
2608 | struct io_ring_ctx *ctx = req->ctx; | |
2609 | ||
2610 | spin_lock(&ctx->completion_lock); | |
2611 | __io_req_complete_post(req, res, cflags); | |
7a612350 | 2612 | io_commit_cqring(ctx); |
79ebeaee | 2613 | spin_unlock(&ctx->completion_lock); |
a3f34907 | 2614 | io_cqring_ev_posted(ctx); |
4e3d9ff9 JA |
2615 | } |
2616 | ||
effcf8bd SR |
2617 | static void io_req_complete_post32(struct io_kiocb *req, s32 res, |
2618 | u32 cflags, u64 extra1, u64 extra2) | |
2619 | { | |
2620 | struct io_ring_ctx *ctx = req->ctx; | |
2621 | ||
2622 | spin_lock(&ctx->completion_lock); | |
2623 | __io_req_complete_post32(req, res, cflags, extra1, extra2); | |
2624 | io_commit_cqring(ctx); | |
2625 | spin_unlock(&ctx->completion_lock); | |
2626 | io_cqring_ev_posted(ctx); | |
2627 | } | |
2628 | ||
54daa9b2 PB |
2629 | static inline void io_req_complete_state(struct io_kiocb *req, s32 res, |
2630 | u32 cflags) | |
229a7b63 | 2631 | { |
cef216fc PB |
2632 | req->cqe.res = res; |
2633 | req->cqe.flags = cflags; | |
e342c807 | 2634 | req->flags |= REQ_F_COMPLETE_INLINE; |
e1e16097 JA |
2635 | } |
2636 | ||
889fca73 | 2637 | static inline void __io_req_complete(struct io_kiocb *req, unsigned issue_flags, |
54daa9b2 | 2638 | s32 res, u32 cflags) |
bcda7baa | 2639 | { |
889fca73 PB |
2640 | if (issue_flags & IO_URING_F_COMPLETE_DEFER) |
2641 | io_req_complete_state(req, res, cflags); | |
a38d68db | 2642 | else |
c7dae4ba | 2643 | io_req_complete_post(req, res, cflags); |
bcda7baa JA |
2644 | } |
2645 | ||
effcf8bd SR |
2646 | static inline void __io_req_complete32(struct io_kiocb *req, |
2647 | unsigned int issue_flags, s32 res, | |
2648 | u32 cflags, u64 extra1, u64 extra2) | |
2649 | { | |
2650 | if (issue_flags & IO_URING_F_COMPLETE_DEFER) { | |
2651 | io_req_complete_state(req, res, cflags); | |
2652 | req->extra1 = extra1; | |
2653 | req->extra2 = extra2; | |
2654 | } else { | |
2655 | io_req_complete_post32(req, res, cflags, extra1, extra2); | |
2656 | } | |
2657 | } | |
2658 | ||
54daa9b2 | 2659 | static inline void io_req_complete(struct io_kiocb *req, s32 res) |
0ddf92e8 | 2660 | { |
4ffaa94b KJ |
2661 | if (res < 0) |
2662 | req_set_fail(req); | |
889fca73 | 2663 | __io_req_complete(req, 0, res, 0); |
0ddf92e8 JA |
2664 | } |
2665 | ||
54daa9b2 | 2666 | static void io_req_complete_failed(struct io_kiocb *req, s32 res) |
f41db273 | 2667 | { |
93d2bcd2 | 2668 | req_set_fail(req); |
ab0ac095 | 2669 | io_req_complete_post(req, res, io_put_kbuf(req, IO_URING_F_UNLOCKED)); |
f41db273 PB |
2670 | } |
2671 | ||
864ea921 PB |
2672 | /* |
2673 | * Don't initialise the fields below on every allocation, but do that in | |
2674 | * advance and keep them valid across allocations. | |
2675 | */ | |
2676 | static void io_preinit_req(struct io_kiocb *req, struct io_ring_ctx *ctx) | |
2677 | { | |
2678 | req->ctx = ctx; | |
2679 | req->link = NULL; | |
2680 | req->async_data = NULL; | |
2681 | /* not necessary, but safer to zero */ | |
cef216fc | 2682 | req->cqe.res = 0; |
864ea921 PB |
2683 | } |
2684 | ||
dac7a098 | 2685 | static void io_flush_cached_locked_reqs(struct io_ring_ctx *ctx, |
cd0ca2e0 | 2686 | struct io_submit_state *state) |
dac7a098 | 2687 | { |
79ebeaee | 2688 | spin_lock(&ctx->completion_lock); |
c2b6c6bc | 2689 | wq_list_splice(&ctx->locked_free_list, &state->free_list); |
d0acdee2 | 2690 | ctx->locked_free_nr = 0; |
79ebeaee | 2691 | spin_unlock(&ctx->completion_lock); |
dac7a098 PB |
2692 | } |
2693 | ||
88ab95be | 2694 | static inline bool io_req_cache_empty(struct io_ring_ctx *ctx) |
0ddf92e8 | 2695 | { |
88ab95be | 2696 | return !ctx->submit_state.free_list.next; |
0ddf92e8 JA |
2697 | } |
2698 | ||
5d5901a3 PB |
2699 | /* |
2700 | * A request might get retired back into the request caches even before opcode | |
2701 | * handlers and io_issue_sqe() are done with it, e.g. inline completion path. | |
2702 | * Because of that, io_alloc_req() should be called only under ->uring_lock | |
2703 | * and with extra caution to not get a request that is still worked on. | |
2704 | */ | |
c072481d | 2705 | static __cold bool __io_alloc_req_refill(struct io_ring_ctx *ctx) |
5d5901a3 | 2706 | __must_hold(&ctx->uring_lock) |
2b188cc1 | 2707 | { |
864ea921 | 2708 | gfp_t gfp = GFP_KERNEL | __GFP_NOWARN; |
3ab665b7 | 2709 | void *reqs[IO_REQ_ALLOC_BATCH]; |
864ea921 | 2710 | int ret, i; |
e5d1bc0a | 2711 | |
23a5c43b PB |
2712 | /* |
2713 | * If we have more than a batch's worth of requests in our IRQ side | |
2714 | * locked cache, grab the lock and move them over to our submission | |
2715 | * side cache. | |
2716 | */ | |
a6d97a8a | 2717 | if (data_race(ctx->locked_free_nr) > IO_COMPL_BATCH) { |
23a5c43b | 2718 | io_flush_cached_locked_reqs(ctx, &ctx->submit_state); |
88ab95be | 2719 | if (!io_req_cache_empty(ctx)) |
23a5c43b PB |
2720 | return true; |
2721 | } | |
e5d1bc0a | 2722 | |
3ab665b7 | 2723 | ret = kmem_cache_alloc_bulk(req_cachep, gfp, ARRAY_SIZE(reqs), reqs); |
fd6fab2c | 2724 | |
864ea921 PB |
2725 | /* |
2726 | * Bulk alloc is all-or-nothing. If we fail to get a batch, | |
2727 | * retry single alloc to be on the safe side. | |
2728 | */ | |
2729 | if (unlikely(ret <= 0)) { | |
3ab665b7 PB |
2730 | reqs[0] = kmem_cache_alloc(req_cachep, gfp); |
2731 | if (!reqs[0]) | |
a33ae9ce | 2732 | return false; |
864ea921 | 2733 | ret = 1; |
2b188cc1 | 2734 | } |
864ea921 | 2735 | |
37f0e767 | 2736 | percpu_ref_get_many(&ctx->refs, ret); |
3ab665b7 | 2737 | for (i = 0; i < ret; i++) { |
23a5c43b | 2738 | struct io_kiocb *req = reqs[i]; |
3ab665b7 PB |
2739 | |
2740 | io_preinit_req(req, ctx); | |
fa05457a | 2741 | io_req_add_to_cache(req, ctx); |
3ab665b7 | 2742 | } |
a33ae9ce PB |
2743 | return true; |
2744 | } | |
2745 | ||
2746 | static inline bool io_alloc_req_refill(struct io_ring_ctx *ctx) | |
2747 | { | |
88ab95be | 2748 | if (unlikely(io_req_cache_empty(ctx))) |
a33ae9ce PB |
2749 | return __io_alloc_req_refill(ctx); |
2750 | return true; | |
2751 | } | |
2752 | ||
2753 | static inline struct io_kiocb *io_alloc_req(struct io_ring_ctx *ctx) | |
2754 | { | |
2755 | struct io_wq_work_node *node; | |
2756 | ||
2757 | node = wq_stack_extract(&ctx->submit_state.free_list); | |
c2b6c6bc | 2758 | return container_of(node, struct io_kiocb, comp_list); |
2b188cc1 JA |
2759 | } |
2760 | ||
e1d767f0 | 2761 | static inline void io_put_file(struct file *file) |
8da11c19 | 2762 | { |
e1d767f0 | 2763 | if (file) |
8da11c19 PB |
2764 | fput(file); |
2765 | } | |
2766 | ||
6b639522 | 2767 | static inline void io_dismantle_req(struct io_kiocb *req) |
2b188cc1 | 2768 | { |
094bae49 | 2769 | unsigned int flags = req->flags; |
929a3af9 | 2770 | |
867f8fa5 | 2771 | if (unlikely(flags & IO_REQ_CLEAN_FLAGS)) |
3a0a6902 | 2772 | io_clean_op(req); |
e1d767f0 PB |
2773 | if (!(flags & REQ_F_FIXED_FILE)) |
2774 | io_put_file(req->file); | |
e65ef56d JA |
2775 | } |
2776 | ||
f5c6cf2a | 2777 | static __cold void io_free_req(struct io_kiocb *req) |
c6ca97b3 | 2778 | { |
51a4cc11 | 2779 | struct io_ring_ctx *ctx = req->ctx; |
c6ca97b3 | 2780 | |
7ac1edc4 | 2781 | io_req_put_rsrc(req); |
216578e5 | 2782 | io_dismantle_req(req); |
7c660731 | 2783 | io_put_task(req->task, 1); |
c6ca97b3 | 2784 | |
79ebeaee | 2785 | spin_lock(&ctx->completion_lock); |
c2b6c6bc | 2786 | wq_list_add_head(&req->comp_list, &ctx->locked_free_list); |
c34b025f | 2787 | ctx->locked_free_nr++; |
79ebeaee | 2788 | spin_unlock(&ctx->completion_lock); |
e65ef56d JA |
2789 | } |
2790 | ||
f2f87370 PB |
2791 | static inline void io_remove_next_linked(struct io_kiocb *req) |
2792 | { | |
2793 | struct io_kiocb *nxt = req->link; | |
2794 | ||
2795 | req->link = nxt->link; | |
2796 | nxt->link = NULL; | |
2797 | } | |
2798 | ||
81ec803b | 2799 | static struct io_kiocb *io_disarm_linked_timeout(struct io_kiocb *req) |
33cc89a9 | 2800 | __must_hold(&req->ctx->completion_lock) |
89b263f6 | 2801 | __must_hold(&req->ctx->timeout_lock) |
2665abfd | 2802 | { |
33cc89a9 | 2803 | struct io_kiocb *link = req->link; |
f2f87370 | 2804 | |
b97e736a | 2805 | if (link && link->opcode == IORING_OP_LINK_TIMEOUT) { |
c9abd7ad | 2806 | struct io_timeout_data *io = link->async_data; |
7c86ffee | 2807 | |
f2f87370 | 2808 | io_remove_next_linked(req); |
90cd7e42 | 2809 | link->timeout.head = NULL; |
fd9c7bc5 | 2810 | if (hrtimer_try_to_cancel(&io->timer) != -1) { |
ef9dd637 | 2811 | list_del(&link->timeout.list); |
81ec803b | 2812 | return link; |
c9abd7ad PB |
2813 | } |
2814 | } | |
81ec803b | 2815 | return NULL; |
7c86ffee PB |
2816 | } |
2817 | ||
d148ca4b | 2818 | static void io_fail_links(struct io_kiocb *req) |
33cc89a9 | 2819 | __must_hold(&req->ctx->completion_lock) |
9e645e11 | 2820 | { |
33cc89a9 | 2821 | struct io_kiocb *nxt, *link = req->link; |
04c76b41 | 2822 | bool ignore_cqes = req->flags & REQ_F_SKIP_LINK_CQES; |
9e645e11 | 2823 | |
f2f87370 | 2824 | req->link = NULL; |
f2f87370 | 2825 | while (link) { |
a8295b98 HX |
2826 | long res = -ECANCELED; |
2827 | ||
2828 | if (link->flags & REQ_F_FAIL) | |
cef216fc | 2829 | res = link->cqe.res; |
a8295b98 | 2830 | |
f2f87370 PB |
2831 | nxt = link->link; |
2832 | link->link = NULL; | |
2665abfd | 2833 | |
cef216fc | 2834 | trace_io_uring_fail_link(req->ctx, req, req->cqe.user_data, |
502c87d6 SR |
2835 | req->opcode, link); |
2836 | ||
4e118cd9 PB |
2837 | if (ignore_cqes) |
2838 | link->flags |= REQ_F_CQE_SKIP; | |
2839 | else | |
04c76b41 | 2840 | link->flags &= ~REQ_F_CQE_SKIP; |
4e118cd9 | 2841 | __io_req_complete_post(link, res, 0); |
f2f87370 | 2842 | link = nxt; |
9e645e11 | 2843 | } |
33cc89a9 | 2844 | } |
9e645e11 | 2845 | |
33cc89a9 PB |
2846 | static bool io_disarm_next(struct io_kiocb *req) |
2847 | __must_hold(&req->ctx->completion_lock) | |
2848 | { | |
81ec803b | 2849 | struct io_kiocb *link = NULL; |
33cc89a9 PB |
2850 | bool posted = false; |
2851 | ||
0756a869 | 2852 | if (req->flags & REQ_F_ARM_LTIMEOUT) { |
81ec803b | 2853 | link = req->link; |
906c6caa | 2854 | req->flags &= ~REQ_F_ARM_LTIMEOUT; |
0756a869 PB |
2855 | if (link && link->opcode == IORING_OP_LINK_TIMEOUT) { |
2856 | io_remove_next_linked(req); | |
4e118cd9 | 2857 | io_req_tw_post_queue(link, -ECANCELED, 0); |
0756a869 PB |
2858 | posted = true; |
2859 | } | |
2860 | } else if (req->flags & REQ_F_LINK_TIMEOUT) { | |
89b263f6 JA |
2861 | struct io_ring_ctx *ctx = req->ctx; |
2862 | ||
2863 | spin_lock_irq(&ctx->timeout_lock); | |
81ec803b | 2864 | link = io_disarm_linked_timeout(req); |
89b263f6 | 2865 | spin_unlock_irq(&ctx->timeout_lock); |
81ec803b PB |
2866 | if (link) { |
2867 | posted = true; | |
2868 | io_req_tw_post_queue(link, -ECANCELED, 0); | |
2869 | } | |
89b263f6 | 2870 | } |
93d2bcd2 | 2871 | if (unlikely((req->flags & REQ_F_FAIL) && |
e4335ed3 | 2872 | !(req->flags & REQ_F_HARDLINK))) { |
33cc89a9 PB |
2873 | posted |= (req->link != NULL); |
2874 | io_fail_links(req); | |
2875 | } | |
2876 | return posted; | |
9e645e11 JA |
2877 | } |
2878 | ||
d81499bf PB |
2879 | static void __io_req_find_next_prep(struct io_kiocb *req) |
2880 | { | |
2881 | struct io_ring_ctx *ctx = req->ctx; | |
2882 | bool posted; | |
2883 | ||
2884 | spin_lock(&ctx->completion_lock); | |
2885 | posted = io_disarm_next(req); | |
60053be8 | 2886 | io_commit_cqring(ctx); |
d81499bf PB |
2887 | spin_unlock(&ctx->completion_lock); |
2888 | if (posted) | |
2889 | io_cqring_ev_posted(ctx); | |
2890 | } | |
2891 | ||
2892 | static inline struct io_kiocb *io_req_find_next(struct io_kiocb *req) | |
c69f8dbe | 2893 | { |
33cc89a9 | 2894 | struct io_kiocb *nxt; |
944e58bf | 2895 | |
9e645e11 JA |
2896 | /* |
2897 | * If LINK is set, we have dependent requests in this chain. If we | |
2898 | * didn't fail this request, queue the first one up, moving any other | |
2899 | * dependencies to the next request. In case of failure, fail the rest | |
2900 | * of the chain. | |
2901 | */ | |
d81499bf PB |
2902 | if (unlikely(req->flags & IO_DISARM_MASK)) |
2903 | __io_req_find_next_prep(req); | |
33cc89a9 PB |
2904 | nxt = req->link; |
2905 | req->link = NULL; | |
2906 | return nxt; | |
4d7dd462 | 2907 | } |
9e645e11 | 2908 | |
f237c30a | 2909 | static void ctx_flush_and_put(struct io_ring_ctx *ctx, bool *locked) |
2c32395d PB |
2910 | { |
2911 | if (!ctx) | |
2912 | return; | |
ef060ea9 JA |
2913 | if (ctx->flags & IORING_SETUP_TASKRUN_FLAG) |
2914 | atomic_andnot(IORING_SQ_TASKRUN, &ctx->rings->sq_flags); | |
f237c30a | 2915 | if (*locked) { |
c450178d | 2916 | io_submit_flush_completions(ctx); |
2c32395d | 2917 | mutex_unlock(&ctx->uring_lock); |
f237c30a | 2918 | *locked = false; |
2c32395d PB |
2919 | } |
2920 | percpu_ref_put(&ctx->refs); | |
2921 | } | |
2922 | ||
f28c240e HX |
2923 | static inline void ctx_commit_and_unlock(struct io_ring_ctx *ctx) |
2924 | { | |
2925 | io_commit_cqring(ctx); | |
2926 | spin_unlock(&ctx->completion_lock); | |
2927 | io_cqring_ev_posted(ctx); | |
2928 | } | |
2929 | ||
2930 | static void handle_prev_tw_list(struct io_wq_work_node *node, | |
2931 | struct io_ring_ctx **ctx, bool *uring_locked) | |
2932 | { | |
2933 | if (*ctx && !*uring_locked) | |
2934 | spin_lock(&(*ctx)->completion_lock); | |
2935 | ||
2936 | do { | |
2937 | struct io_wq_work_node *next = node->next; | |
2938 | struct io_kiocb *req = container_of(node, struct io_kiocb, | |
2939 | io_task_work.node); | |
2940 | ||
34d2bfe7 JA |
2941 | prefetch(container_of(next, struct io_kiocb, io_task_work.node)); |
2942 | ||
f28c240e HX |
2943 | if (req->ctx != *ctx) { |
2944 | if (unlikely(!*uring_locked && *ctx)) | |
2945 | ctx_commit_and_unlock(*ctx); | |
2946 | ||
2947 | ctx_flush_and_put(*ctx, uring_locked); | |
2948 | *ctx = req->ctx; | |
2949 | /* if not contended, grab and improve batching */ | |
2950 | *uring_locked = mutex_trylock(&(*ctx)->uring_lock); | |
2951 | percpu_ref_get(&(*ctx)->refs); | |
2952 | if (unlikely(!*uring_locked)) | |
2953 | spin_lock(&(*ctx)->completion_lock); | |
2954 | } | |
2955 | if (likely(*uring_locked)) | |
2956 | req->io_task_work.func(req, uring_locked); | |
2957 | else | |
cef216fc | 2958 | __io_req_complete_post(req, req->cqe.res, |
cc3cec83 | 2959 | io_put_kbuf_comp(req)); |
f28c240e HX |
2960 | node = next; |
2961 | } while (node); | |
2962 | ||
2963 | if (unlikely(!*uring_locked)) | |
2964 | ctx_commit_and_unlock(*ctx); | |
2965 | } | |
2966 | ||
2967 | static void handle_tw_list(struct io_wq_work_node *node, | |
2968 | struct io_ring_ctx **ctx, bool *locked) | |
9f8d032a HX |
2969 | { |
2970 | do { | |
2971 | struct io_wq_work_node *next = node->next; | |
2972 | struct io_kiocb *req = container_of(node, struct io_kiocb, | |
2973 | io_task_work.node); | |
2974 | ||
34d2bfe7 JA |
2975 | prefetch(container_of(next, struct io_kiocb, io_task_work.node)); |
2976 | ||
9f8d032a HX |
2977 | if (req->ctx != *ctx) { |
2978 | ctx_flush_and_put(*ctx, locked); | |
2979 | *ctx = req->ctx; | |
2980 | /* if not contended, grab and improve batching */ | |
2981 | *locked = mutex_trylock(&(*ctx)->uring_lock); | |
2982 | percpu_ref_get(&(*ctx)->refs); | |
2983 | } | |
2984 | req->io_task_work.func(req, locked); | |
2985 | node = next; | |
2986 | } while (node); | |
2987 | } | |
2988 | ||
7cbf1722 | 2989 | static void tctx_task_work(struct callback_head *cb) |
c40f6379 | 2990 | { |
f28c240e | 2991 | bool uring_locked = false; |
ebd0df2e | 2992 | struct io_ring_ctx *ctx = NULL; |
3f18407d PB |
2993 | struct io_uring_task *tctx = container_of(cb, struct io_uring_task, |
2994 | task_work); | |
c40f6379 | 2995 | |
16f72070 | 2996 | while (1) { |
f28c240e | 2997 | struct io_wq_work_node *node1, *node2; |
3f18407d PB |
2998 | |
2999 | spin_lock_irq(&tctx->task_lock); | |
3fe07bcd | 3000 | node1 = tctx->prio_task_list.first; |
f28c240e | 3001 | node2 = tctx->task_list.first; |
3f18407d | 3002 | INIT_WQ_LIST(&tctx->task_list); |
3fe07bcd | 3003 | INIT_WQ_LIST(&tctx->prio_task_list); |
f28c240e | 3004 | if (!node2 && !node1) |
6294f368 | 3005 | tctx->task_running = false; |
3f18407d | 3006 | spin_unlock_irq(&tctx->task_lock); |
f28c240e | 3007 | if (!node2 && !node1) |
6294f368 | 3008 | break; |
3f18407d | 3009 | |
f28c240e HX |
3010 | if (node1) |
3011 | handle_prev_tw_list(node1, &ctx, &uring_locked); | |
f28c240e HX |
3012 | if (node2) |
3013 | handle_tw_list(node2, &ctx, &uring_locked); | |
7cbf1722 | 3014 | cond_resched(); |
68ca8fc0 | 3015 | |
a6d97a8a | 3016 | if (data_race(!tctx->task_list.first) && |
3fe07bcd | 3017 | data_race(!tctx->prio_task_list.first) && uring_locked) |
68ca8fc0 | 3018 | io_submit_flush_completions(ctx); |
3f18407d | 3019 | } |
ebd0df2e | 3020 | |
f28c240e | 3021 | ctx_flush_and_put(ctx, &uring_locked); |
3cc7fdb9 PB |
3022 | |
3023 | /* relaxed read is enough as only the task itself sets ->in_idle */ | |
3024 | if (unlikely(atomic_read(&tctx->in_idle))) | |
3025 | io_uring_drop_tctx_refs(current); | |
7cbf1722 JA |
3026 | } |
3027 | ||
3fe07bcd JA |
3028 | static void __io_req_task_work_add(struct io_kiocb *req, |
3029 | struct io_uring_task *tctx, | |
3030 | struct io_wq_work_list *list) | |
7cbf1722 | 3031 | { |
9f010507 | 3032 | struct io_ring_ctx *ctx = req->ctx; |
e09ee510 | 3033 | struct io_wq_work_node *node; |
0b81e80c | 3034 | unsigned long flags; |
6294f368 | 3035 | bool running; |
7cbf1722 | 3036 | |
0b81e80c | 3037 | spin_lock_irqsave(&tctx->task_lock, flags); |
3fe07bcd | 3038 | wq_list_add_tail(&req->io_task_work.node, list); |
6294f368 PB |
3039 | running = tctx->task_running; |
3040 | if (!running) | |
3041 | tctx->task_running = true; | |
0b81e80c | 3042 | spin_unlock_irqrestore(&tctx->task_lock, flags); |
7cbf1722 JA |
3043 | |
3044 | /* task_work already pending, we're done */ | |
6294f368 | 3045 | if (running) |
e09ee510 | 3046 | return; |
7cbf1722 | 3047 | |
ef060ea9 JA |
3048 | if (ctx->flags & IORING_SETUP_TASKRUN_FLAG) |
3049 | atomic_or(IORING_SQ_TASKRUN, &ctx->rings->sq_flags); | |
3050 | ||
3fe07bcd | 3051 | if (likely(!task_work_add(req->task, &tctx->task_work, ctx->notify_method))) |
e09ee510 | 3052 | return; |
2215bed9 | 3053 | |
0b81e80c | 3054 | spin_lock_irqsave(&tctx->task_lock, flags); |
6294f368 | 3055 | tctx->task_running = false; |
3fe07bcd | 3056 | node = wq_list_merge(&tctx->prio_task_list, &tctx->task_list); |
0b81e80c | 3057 | spin_unlock_irqrestore(&tctx->task_lock, flags); |
7cbf1722 | 3058 | |
e09ee510 PB |
3059 | while (node) { |
3060 | req = container_of(node, struct io_kiocb, io_task_work.node); | |
3061 | node = node->next; | |
3062 | if (llist_add(&req->io_task_work.fallback_node, | |
3063 | &req->ctx->fallback_llist)) | |
3064 | schedule_delayed_work(&req->ctx->fallback_work, 1); | |
3065 | } | |
eab30c4d PB |
3066 | } |
3067 | ||
3fe07bcd JA |
3068 | static void io_req_task_work_add(struct io_kiocb *req) |
3069 | { | |
3070 | struct io_uring_task *tctx = req->task->io_uring; | |
3071 | ||
3072 | __io_req_task_work_add(req, tctx, &tctx->task_list); | |
3073 | } | |
3074 | ||
3075 | static void io_req_task_prio_work_add(struct io_kiocb *req) | |
3076 | { | |
3077 | struct io_uring_task *tctx = req->task->io_uring; | |
3078 | ||
3079 | if (req->ctx->flags & IORING_SETUP_SQPOLL) | |
3080 | __io_req_task_work_add(req, tctx, &tctx->prio_task_list); | |
3081 | else | |
3082 | __io_req_task_work_add(req, tctx, &tctx->task_list); | |
3083 | } | |
3084 | ||
4e118cd9 | 3085 | static void io_req_tw_post(struct io_kiocb *req, bool *locked) |
c40f6379 | 3086 | { |
4e118cd9 PB |
3087 | io_req_complete_post(req, req->cqe.res, req->cqe.flags); |
3088 | } | |
c40f6379 | 3089 | |
4e118cd9 PB |
3090 | static void io_req_tw_post_queue(struct io_kiocb *req, s32 res, u32 cflags) |
3091 | { | |
3092 | req->cqe.res = res; | |
3093 | req->cqe.flags = cflags; | |
3094 | req->io_task_work.func = io_req_tw_post; | |
3fe07bcd | 3095 | io_req_task_work_add(req); |
4e118cd9 PB |
3096 | } |
3097 | ||
f237c30a | 3098 | static void io_req_task_cancel(struct io_kiocb *req, bool *locked) |
c40f6379 | 3099 | { |
b18a1a45 | 3100 | /* not needed for normal modes, but SQPOLL depends on it */ |
971cf9c1 | 3101 | io_tw_lock(req->ctx, locked); |
cef216fc | 3102 | io_req_complete_failed(req, req->cqe.res); |
c40f6379 JA |
3103 | } |
3104 | ||
f237c30a | 3105 | static void io_req_task_submit(struct io_kiocb *req, bool *locked) |
c40f6379 | 3106 | { |
971cf9c1 | 3107 | io_tw_lock(req->ctx, locked); |
316319e8 | 3108 | /* req->task == current here, checking PF_EXITING is safe */ |
af066f31 | 3109 | if (likely(!(req->task->flags & PF_EXITING))) |
cbc2e203 | 3110 | io_queue_sqe(req); |
81b6d05c | 3111 | else |
2593553a | 3112 | io_req_complete_failed(req, -EFAULT); |
c40f6379 JA |
3113 | } |
3114 | ||
2c4b8eb6 | 3115 | static void io_req_task_queue_fail(struct io_kiocb *req, int ret) |
c40f6379 | 3116 | { |
cef216fc | 3117 | req->cqe.res = ret; |
5b0a6acc | 3118 | req->io_task_work.func = io_req_task_cancel; |
3fe07bcd | 3119 | io_req_task_work_add(req); |
c40f6379 JA |
3120 | } |
3121 | ||
2c4b8eb6 | 3122 | static void io_req_task_queue(struct io_kiocb *req) |
a3df7698 | 3123 | { |
5b0a6acc | 3124 | req->io_task_work.func = io_req_task_submit; |
3fe07bcd | 3125 | io_req_task_work_add(req); |
a3df7698 PB |
3126 | } |
3127 | ||
773af691 JA |
3128 | static void io_req_task_queue_reissue(struct io_kiocb *req) |
3129 | { | |
77955efb | 3130 | req->io_task_work.func = io_queue_iowq; |
3fe07bcd | 3131 | io_req_task_work_add(req); |
773af691 JA |
3132 | } |
3133 | ||
57859f4d | 3134 | static void io_queue_next(struct io_kiocb *req) |
c69f8dbe | 3135 | { |
9b5f7bd9 | 3136 | struct io_kiocb *nxt = io_req_find_next(req); |
944e58bf PB |
3137 | |
3138 | if (nxt) | |
906a8c3f | 3139 | io_req_task_queue(nxt); |
c69f8dbe JL |
3140 | } |
3141 | ||
3aa83bfb | 3142 | static void io_free_batch_list(struct io_ring_ctx *ctx, |
1cce17ac | 3143 | struct io_wq_work_node *node) |
3aa83bfb | 3144 | __must_hold(&ctx->uring_lock) |
5af1d13e | 3145 | { |
d4b7a5ef | 3146 | struct task_struct *task = NULL; |
37f0e767 | 3147 | int task_refs = 0; |
5af1d13e | 3148 | |
3aa83bfb PB |
3149 | do { |
3150 | struct io_kiocb *req = container_of(node, struct io_kiocb, | |
3151 | comp_list); | |
2d6500d4 | 3152 | |
a538be5b PB |
3153 | if (unlikely(req->flags & IO_REQ_CLEAN_SLOW_FLAGS)) { |
3154 | if (req->flags & REQ_F_REFCOUNT) { | |
3155 | node = req->comp_list.next; | |
3156 | if (!req_ref_put_and_test(req)) | |
3157 | continue; | |
3158 | } | |
b605a7fa PB |
3159 | if ((req->flags & REQ_F_POLLED) && req->apoll) { |
3160 | struct async_poll *apoll = req->apoll; | |
3161 | ||
3162 | if (apoll->double_poll) | |
3163 | kfree(apoll->double_poll); | |
3164 | list_add(&apoll->poll.wait.entry, | |
3165 | &ctx->apoll_cache); | |
3166 | req->flags &= ~REQ_F_POLLED; | |
3167 | } | |
da1a08c5 | 3168 | if (req->flags & IO_REQ_LINK_FLAGS) |
57859f4d | 3169 | io_queue_next(req); |
a538be5b PB |
3170 | if (unlikely(req->flags & IO_REQ_CLEAN_FLAGS)) |
3171 | io_clean_op(req); | |
c1e53a69 | 3172 | } |
a538be5b PB |
3173 | if (!(req->flags & REQ_F_FIXED_FILE)) |
3174 | io_put_file(req->file); | |
2d6500d4 | 3175 | |
ab409402 | 3176 | io_req_put_rsrc_locked(req, ctx); |
5af1d13e | 3177 | |
d4b7a5ef PB |
3178 | if (req->task != task) { |
3179 | if (task) | |
3180 | io_put_task(task, task_refs); | |
3181 | task = req->task; | |
3182 | task_refs = 0; | |
3183 | } | |
3184 | task_refs++; | |
c1e53a69 | 3185 | node = req->comp_list.next; |
fa05457a | 3186 | io_req_add_to_cache(req, ctx); |
3aa83bfb | 3187 | } while (node); |
d4b7a5ef | 3188 | |
d4b7a5ef PB |
3189 | if (task) |
3190 | io_put_task(task, task_refs); | |
7a743e22 PB |
3191 | } |
3192 | ||
c450178d | 3193 | static void __io_submit_flush_completions(struct io_ring_ctx *ctx) |
a141dd89 | 3194 | __must_hold(&ctx->uring_lock) |
905c172f | 3195 | { |
6f33b0bc | 3196 | struct io_wq_work_node *node, *prev; |
cd0ca2e0 | 3197 | struct io_submit_state *state = &ctx->submit_state; |
905c172f | 3198 | |
3d4aeb9f PB |
3199 | if (state->flush_cqes) { |
3200 | spin_lock(&ctx->completion_lock); | |
3201 | wq_list_for_each(node, prev, &state->compl_reqs) { | |
3202 | struct io_kiocb *req = container_of(node, struct io_kiocb, | |
6f33b0bc | 3203 | comp_list); |
5182ed2e | 3204 | |
0e2e5c47 SR |
3205 | if (!(req->flags & REQ_F_CQE_SKIP)) { |
3206 | if (!(ctx->flags & IORING_SETUP_CQE32)) | |
3207 | __io_fill_cqe_req_filled(ctx, req); | |
3208 | else | |
3209 | __io_fill_cqe32_req_filled(ctx, req); | |
3210 | } | |
3d4aeb9f PB |
3211 | } |
3212 | ||
3213 | io_commit_cqring(ctx); | |
3214 | spin_unlock(&ctx->completion_lock); | |
3215 | io_cqring_ev_posted(ctx); | |
3216 | state->flush_cqes = false; | |
905c172f | 3217 | } |
5182ed2e | 3218 | |
1cce17ac | 3219 | io_free_batch_list(ctx, state->compl_reqs.first); |
6f33b0bc | 3220 | INIT_WQ_LIST(&state->compl_reqs); |
7a743e22 PB |
3221 | } |
3222 | ||
ba816ad6 JA |
3223 | /* |
3224 | * Drop reference to request, return next in chain (if there is one) if this | |
3225 | * was the last reference to this request. | |
3226 | */ | |
0d85035a | 3227 | static inline struct io_kiocb *io_put_req_find_next(struct io_kiocb *req) |
e65ef56d | 3228 | { |
9b5f7bd9 PB |
3229 | struct io_kiocb *nxt = NULL; |
3230 | ||
de9b4cca | 3231 | if (req_ref_put_and_test(req)) { |
da1a08c5 | 3232 | if (unlikely(req->flags & IO_REQ_LINK_FLAGS)) |
7819a1f6 | 3233 | nxt = io_req_find_next(req); |
f5c6cf2a | 3234 | io_free_req(req); |
2a44f467 | 3235 | } |
9b5f7bd9 | 3236 | return nxt; |
2b188cc1 JA |
3237 | } |
3238 | ||
0d85035a | 3239 | static inline void io_put_req(struct io_kiocb *req) |
e65ef56d | 3240 | { |
f5c6cf2a PB |
3241 | if (req_ref_put_and_test(req)) { |
3242 | io_queue_next(req); | |
e65ef56d | 3243 | io_free_req(req); |
543af3a1 | 3244 | } |
216578e5 PB |
3245 | } |
3246 | ||
6c503150 | 3247 | static unsigned io_cqring_events(struct io_ring_ctx *ctx) |
a3a0e43f JA |
3248 | { |
3249 | /* See comment at the top of this file */ | |
3250 | smp_rmb(); | |
e23de15f | 3251 | return __io_cqring_events(ctx); |
a3a0e43f JA |
3252 | } |
3253 | ||
fb5ccc98 PB |
3254 | static inline unsigned int io_sqring_entries(struct io_ring_ctx *ctx) |
3255 | { | |
3256 | struct io_rings *rings = ctx->rings; | |
3257 | ||
3258 | /* make sure SQ entry isn't read before tail */ | |
3259 | return smp_load_acquire(&rings->sq.tail) - ctx->cached_sq_head; | |
3260 | } | |
3261 | ||
4c6e277c JA |
3262 | static inline bool io_run_task_work(void) |
3263 | { | |
7f62d40d | 3264 | if (test_thread_flag(TIF_NOTIFY_SIGNAL) || task_work_pending(current)) { |
4c6e277c | 3265 | __set_current_state(TASK_RUNNING); |
7c5d8fa6 EB |
3266 | clear_notify_signal(); |
3267 | if (task_work_pending(current)) | |
3268 | task_work_run(); | |
4c6e277c JA |
3269 | return true; |
3270 | } | |
3271 | ||
3272 | return false; | |
bcda7baa JA |
3273 | } |
3274 | ||
5ba3c874 | 3275 | static int io_do_iopoll(struct io_ring_ctx *ctx, bool force_nonspin) |
def596e9 | 3276 | { |
5eef4e87 | 3277 | struct io_wq_work_node *pos, *start, *prev; |
d729cf9a | 3278 | unsigned int poll_flags = BLK_POLL_NOSLEEP; |
b688f11e | 3279 | DEFINE_IO_COMP_BATCH(iob); |
5ba3c874 | 3280 | int nr_events = 0; |
def596e9 JA |
3281 | |
3282 | /* | |
3283 | * Only spin for completions if we don't have multiple devices hanging | |
87a115fb | 3284 | * off our complete list. |
def596e9 | 3285 | */ |
87a115fb | 3286 | if (ctx->poll_multi_queue || force_nonspin) |
ef99b2d3 | 3287 | poll_flags |= BLK_POLL_ONESHOT; |
def596e9 | 3288 | |
5eef4e87 PB |
3289 | wq_list_for_each(pos, start, &ctx->iopoll_list) { |
3290 | struct io_kiocb *req = container_of(pos, struct io_kiocb, comp_list); | |
9adbd45d | 3291 | struct kiocb *kiocb = &req->rw.kiocb; |
a2416e1e | 3292 | int ret; |
def596e9 JA |
3293 | |
3294 | /* | |
581f9810 BM |
3295 | * Move completed and retryable entries to our local lists. |
3296 | * If we find a request that requires polling, break out | |
3297 | * and complete those lists first, if we have entries there. | |
def596e9 | 3298 | */ |
e3f721e6 | 3299 | if (READ_ONCE(req->iopoll_completed)) |
def596e9 JA |
3300 | break; |
3301 | ||
b688f11e | 3302 | ret = kiocb->ki_filp->f_op->iopoll(kiocb, &iob, poll_flags); |
a2416e1e PB |
3303 | if (unlikely(ret < 0)) |
3304 | return ret; | |
3305 | else if (ret) | |
ef99b2d3 | 3306 | poll_flags |= BLK_POLL_ONESHOT; |
def596e9 | 3307 | |
3aadc23e | 3308 | /* iopoll may have completed current req */ |
b688f11e JA |
3309 | if (!rq_list_empty(iob.req_list) || |
3310 | READ_ONCE(req->iopoll_completed)) | |
e3f721e6 | 3311 | break; |
def596e9 JA |
3312 | } |
3313 | ||
b688f11e JA |
3314 | if (!rq_list_empty(iob.req_list)) |
3315 | iob.complete(&iob); | |
5eef4e87 PB |
3316 | else if (!pos) |
3317 | return 0; | |
def596e9 | 3318 | |
5eef4e87 PB |
3319 | prev = start; |
3320 | wq_list_for_each_resume(pos, prev) { | |
3321 | struct io_kiocb *req = container_of(pos, struct io_kiocb, comp_list); | |
3322 | ||
b3fa03fd PB |
3323 | /* order with io_complete_rw_iopoll(), e.g. ->result updates */ |
3324 | if (!smp_load_acquire(&req->iopoll_completed)) | |
e3f721e6 | 3325 | break; |
c0713540 | 3326 | nr_events++; |
83a13a41 PB |
3327 | if (unlikely(req->flags & REQ_F_CQE_SKIP)) |
3328 | continue; | |
cef216fc | 3329 | __io_fill_cqe_req(req, req->cqe.res, io_put_kbuf(req, 0)); |
e3f721e6 | 3330 | } |
def596e9 | 3331 | |
f5ed3bcd PB |
3332 | if (unlikely(!nr_events)) |
3333 | return 0; | |
3334 | ||
3335 | io_commit_cqring(ctx); | |
3336 | io_cqring_ev_posted_iopoll(ctx); | |
1cce17ac | 3337 | pos = start ? start->next : ctx->iopoll_list.first; |
5eef4e87 | 3338 | wq_list_cut(&ctx->iopoll_list, prev, start); |
1cce17ac | 3339 | io_free_batch_list(ctx, pos); |
5ba3c874 | 3340 | return nr_events; |
def596e9 JA |
3341 | } |
3342 | ||
def596e9 JA |
3343 | /* |
3344 | * We can't just wait for polled events to come to us, we have to actively | |
3345 | * find and complete them. | |
3346 | */ | |
c072481d | 3347 | static __cold void io_iopoll_try_reap_events(struct io_ring_ctx *ctx) |
def596e9 JA |
3348 | { |
3349 | if (!(ctx->flags & IORING_SETUP_IOPOLL)) | |
3350 | return; | |
3351 | ||
3352 | mutex_lock(&ctx->uring_lock); | |
5eef4e87 | 3353 | while (!wq_list_empty(&ctx->iopoll_list)) { |
b2edc0a7 | 3354 | /* let it sleep and repeat later if can't complete a request */ |
5ba3c874 | 3355 | if (io_do_iopoll(ctx, true) == 0) |
b2edc0a7 | 3356 | break; |
08f5439f JA |
3357 | /* |
3358 | * Ensure we allow local-to-the-cpu processing to take place, | |
3359 | * in this case we need to ensure that we reap all events. | |
3fcee5a6 | 3360 | * Also let task_work, etc. to progress by releasing the mutex |
08f5439f | 3361 | */ |
3fcee5a6 PB |
3362 | if (need_resched()) { |
3363 | mutex_unlock(&ctx->uring_lock); | |
3364 | cond_resched(); | |
3365 | mutex_lock(&ctx->uring_lock); | |
3366 | } | |
def596e9 JA |
3367 | } |
3368 | mutex_unlock(&ctx->uring_lock); | |
3369 | } | |
3370 | ||
7668b92a | 3371 | static int io_iopoll_check(struct io_ring_ctx *ctx, long min) |
def596e9 | 3372 | { |
7668b92a | 3373 | unsigned int nr_events = 0; |
e9979b36 | 3374 | int ret = 0; |
155bc950 | 3375 | unsigned long check_cq; |
500f9fba | 3376 | |
f39c8a5b PB |
3377 | /* |
3378 | * Don't enter poll loop if we already have events pending. | |
3379 | * If we do, we can potentially be spinning for commands that | |
3380 | * already triggered a CQE (eg in error). | |
3381 | */ | |
155bc950 DY |
3382 | check_cq = READ_ONCE(ctx->check_cq); |
3383 | if (check_cq & BIT(IO_CHECK_CQ_OVERFLOW_BIT)) | |
f39c8a5b PB |
3384 | __io_cqring_overflow_flush(ctx, false); |
3385 | if (io_cqring_events(ctx)) | |
d487b43c | 3386 | return 0; |
155bc950 DY |
3387 | |
3388 | /* | |
3389 | * Similarly do not spin if we have not informed the user of any | |
3390 | * dropped CQE. | |
3391 | */ | |
3392 | if (unlikely(check_cq & BIT(IO_CHECK_CQ_DROPPED_BIT))) | |
3393 | return -EBADR; | |
3394 | ||
def596e9 | 3395 | do { |
500f9fba JA |
3396 | /* |
3397 | * If a submit got punted to a workqueue, we can have the | |
3398 | * application entering polling for a command before it gets | |
3399 | * issued. That app will hold the uring_lock for the duration | |
3400 | * of the poll right here, so we need to take a breather every | |
3401 | * now and then to ensure that the issue has a chance to add | |
3402 | * the poll to the issued list. Otherwise we can spin here | |
3403 | * forever, while the workqueue is stuck trying to acquire the | |
3404 | * very same mutex. | |
3405 | */ | |
5eef4e87 | 3406 | if (wq_list_empty(&ctx->iopoll_list)) { |
8f487ef2 PB |
3407 | u32 tail = ctx->cached_cq_tail; |
3408 | ||
500f9fba | 3409 | mutex_unlock(&ctx->uring_lock); |
4c6e277c | 3410 | io_run_task_work(); |
500f9fba | 3411 | mutex_lock(&ctx->uring_lock); |
def596e9 | 3412 | |
8f487ef2 PB |
3413 | /* some requests don't go through iopoll_list */ |
3414 | if (tail != ctx->cached_cq_tail || | |
5eef4e87 | 3415 | wq_list_empty(&ctx->iopoll_list)) |
e9979b36 | 3416 | break; |
500f9fba | 3417 | } |
5ba3c874 PB |
3418 | ret = io_do_iopoll(ctx, !min); |
3419 | if (ret < 0) | |
3420 | break; | |
3421 | nr_events += ret; | |
3422 | ret = 0; | |
3423 | } while (nr_events < min && !need_resched()); | |
d487b43c | 3424 | |
def596e9 JA |
3425 | return ret; |
3426 | } | |
3427 | ||
491381ce | 3428 | static void kiocb_end_write(struct io_kiocb *req) |
2b188cc1 | 3429 | { |
491381ce JA |
3430 | /* |
3431 | * Tell lockdep we inherited freeze protection from submission | |
3432 | * thread. | |
3433 | */ | |
3434 | if (req->flags & REQ_F_ISREG) { | |
1c98679d | 3435 | struct super_block *sb = file_inode(req->file)->i_sb; |
2b188cc1 | 3436 | |
1c98679d PB |
3437 | __sb_writers_acquired(sb, SB_FREEZE_WRITE); |
3438 | sb_end_write(sb); | |
2b188cc1 JA |
3439 | } |
3440 | } | |
3441 | ||
b63534c4 | 3442 | #ifdef CONFIG_BLOCK |
dc2a6e9a | 3443 | static bool io_resubmit_prep(struct io_kiocb *req) |
b63534c4 | 3444 | { |
ab454438 | 3445 | struct io_async_rw *rw = req->async_data; |
b63534c4 | 3446 | |
d886e185 | 3447 | if (!req_has_async_data(req)) |
ab454438 | 3448 | return !io_req_prep_async(req); |
538941e2 | 3449 | iov_iter_restore(&rw->s.iter, &rw->s.iter_state); |
ab454438 | 3450 | return true; |
b63534c4 | 3451 | } |
b63534c4 | 3452 | |
3e6a0d3c | 3453 | static bool io_rw_should_reissue(struct io_kiocb *req) |
b63534c4 | 3454 | { |
355afaeb | 3455 | umode_t mode = file_inode(req->file)->i_mode; |
3e6a0d3c | 3456 | struct io_ring_ctx *ctx = req->ctx; |
b63534c4 | 3457 | |
355afaeb JA |
3458 | if (!S_ISBLK(mode) && !S_ISREG(mode)) |
3459 | return false; | |
3e6a0d3c JA |
3460 | if ((req->flags & REQ_F_NOWAIT) || (io_wq_current_is_worker() && |
3461 | !(ctx->flags & IORING_SETUP_IOPOLL))) | |
b63534c4 | 3462 | return false; |
7c977a58 JA |
3463 | /* |
3464 | * If ref is dying, we might be running poll reap from the exit work. | |
3465 | * Don't attempt to reissue from that path, just let it fail with | |
3466 | * -EAGAIN. | |
3467 | */ | |
3e6a0d3c JA |
3468 | if (percpu_ref_is_dying(&ctx->refs)) |
3469 | return false; | |
ef046888 JA |
3470 | /* |
3471 | * Play it safe and assume not safe to re-import and reissue if we're | |
3472 | * not in the original thread group (or in task context). | |
3473 | */ | |
3474 | if (!same_thread_group(req->task, current) || !in_task()) | |
3475 | return false; | |
3e6a0d3c JA |
3476 | return true; |
3477 | } | |
e82ad485 | 3478 | #else |
a1ff1e3f | 3479 | static bool io_resubmit_prep(struct io_kiocb *req) |
e82ad485 JA |
3480 | { |
3481 | return false; | |
3482 | } | |
e82ad485 | 3483 | static bool io_rw_should_reissue(struct io_kiocb *req) |
3e6a0d3c | 3484 | { |
b63534c4 JA |
3485 | return false; |
3486 | } | |
3e6a0d3c | 3487 | #endif |
b63534c4 | 3488 | |
8ef12efe | 3489 | static bool __io_complete_rw_common(struct io_kiocb *req, long res) |
a1d7c393 | 3490 | { |
f63cf519 | 3491 | if (req->rw.kiocb.ki_flags & IOCB_WRITE) { |
b65c128f | 3492 | kiocb_end_write(req); |
f63cf519 JA |
3493 | fsnotify_modify(req->file); |
3494 | } else { | |
3495 | fsnotify_access(req->file); | |
3496 | } | |
cef216fc | 3497 | if (unlikely(res != req->cqe.res)) { |
9532b99b PB |
3498 | if ((res == -EAGAIN || res == -EOPNOTSUPP) && |
3499 | io_rw_should_reissue(req)) { | |
3500 | req->flags |= REQ_F_REISSUE; | |
8ef12efe | 3501 | return true; |
9532b99b | 3502 | } |
93d2bcd2 | 3503 | req_set_fail(req); |
cef216fc | 3504 | req->cqe.res = res; |
9532b99b | 3505 | } |
8ef12efe JA |
3506 | return false; |
3507 | } | |
3508 | ||
cc8e9ba7 | 3509 | static inline void io_req_task_complete(struct io_kiocb *req, bool *locked) |
8ef12efe | 3510 | { |
cef216fc | 3511 | int res = req->cqe.res; |
126180b9 PB |
3512 | |
3513 | if (*locked) { | |
cc3cec83 | 3514 | io_req_complete_state(req, res, io_put_kbuf(req, 0)); |
fff4e40e | 3515 | io_req_add_compl_list(req); |
126180b9 | 3516 | } else { |
cc3cec83 JA |
3517 | io_req_complete_post(req, res, |
3518 | io_put_kbuf(req, IO_URING_F_UNLOCKED)); | |
126180b9 | 3519 | } |
8ef12efe JA |
3520 | } |
3521 | ||
00f6e68b | 3522 | static void __io_complete_rw(struct io_kiocb *req, long res, |
8ef12efe JA |
3523 | unsigned int issue_flags) |
3524 | { | |
3525 | if (__io_complete_rw_common(req, res)) | |
3526 | return; | |
cef216fc | 3527 | __io_req_complete(req, issue_flags, req->cqe.res, |
cc3cec83 | 3528 | io_put_kbuf(req, issue_flags)); |
ba816ad6 JA |
3529 | } |
3530 | ||
6b19b766 | 3531 | static void io_complete_rw(struct kiocb *kiocb, long res) |
ba816ad6 | 3532 | { |
9adbd45d | 3533 | struct io_kiocb *req = container_of(kiocb, struct io_kiocb, rw.kiocb); |
ba816ad6 | 3534 | |
8ef12efe JA |
3535 | if (__io_complete_rw_common(req, res)) |
3536 | return; | |
cef216fc | 3537 | req->cqe.res = res; |
8ef12efe | 3538 | req->io_task_work.func = io_req_task_complete; |
3fe07bcd | 3539 | io_req_task_prio_work_add(req); |
2b188cc1 JA |
3540 | } |
3541 | ||
6b19b766 | 3542 | static void io_complete_rw_iopoll(struct kiocb *kiocb, long res) |
def596e9 | 3543 | { |
9adbd45d | 3544 | struct io_kiocb *req = container_of(kiocb, struct io_kiocb, rw.kiocb); |
def596e9 | 3545 | |
491381ce JA |
3546 | if (kiocb->ki_flags & IOCB_WRITE) |
3547 | kiocb_end_write(req); | |
cef216fc | 3548 | if (unlikely(res != req->cqe.res)) { |
b66ceaf3 PB |
3549 | if (res == -EAGAIN && io_rw_should_reissue(req)) { |
3550 | req->flags |= REQ_F_REISSUE; | |
3551 | return; | |
9532b99b | 3552 | } |
cef216fc | 3553 | req->cqe.res = res; |
8c130827 | 3554 | } |
bbde017a | 3555 | |
b3fa03fd PB |
3556 | /* order with io_iopoll_complete() checking ->iopoll_completed */ |
3557 | smp_store_release(&req->iopoll_completed, 1); | |
def596e9 JA |
3558 | } |
3559 | ||
3560 | /* | |
3561 | * After the iocb has been issued, it's safe to be found on the poll list. | |
3562 | * Adding the kiocb to the list AFTER submission ensures that we don't | |
f39c8a5b | 3563 | * find it from a io_do_iopoll() thread before the issuer is done |
def596e9 JA |
3564 | * accessing the kiocb cookie. |
3565 | */ | |
9882131c | 3566 | static void io_iopoll_req_issued(struct io_kiocb *req, unsigned int issue_flags) |
def596e9 JA |
3567 | { |
3568 | struct io_ring_ctx *ctx = req->ctx; | |
3b44b371 | 3569 | const bool needs_lock = issue_flags & IO_URING_F_UNLOCKED; |
cb3d8972 PB |
3570 | |
3571 | /* workqueue context doesn't hold uring_lock, grab it now */ | |
3b44b371 | 3572 | if (unlikely(needs_lock)) |
cb3d8972 | 3573 | mutex_lock(&ctx->uring_lock); |
def596e9 JA |
3574 | |
3575 | /* | |
3576 | * Track whether we have multiple files in our lists. This will impact | |
3577 | * how we do polling eventually, not spinning if we're on potentially | |
3578 | * different devices. | |
3579 | */ | |
5eef4e87 | 3580 | if (wq_list_empty(&ctx->iopoll_list)) { |
915b3dde HX |
3581 | ctx->poll_multi_queue = false; |
3582 | } else if (!ctx->poll_multi_queue) { | |
def596e9 JA |
3583 | struct io_kiocb *list_req; |
3584 | ||
5eef4e87 PB |
3585 | list_req = container_of(ctx->iopoll_list.first, struct io_kiocb, |
3586 | comp_list); | |
30da1b45 | 3587 | if (list_req->file != req->file) |
915b3dde | 3588 | ctx->poll_multi_queue = true; |
def596e9 JA |
3589 | } |
3590 | ||
3591 | /* | |
3592 | * For fast devices, IO may have already completed. If it has, add | |
3593 | * it to the front so we find it first. | |
3594 | */ | |
65a6543d | 3595 | if (READ_ONCE(req->iopoll_completed)) |
5eef4e87 | 3596 | wq_list_add_head(&req->comp_list, &ctx->iopoll_list); |
def596e9 | 3597 | else |
5eef4e87 | 3598 | wq_list_add_tail(&req->comp_list, &ctx->iopoll_list); |
bdcd3eab | 3599 | |
3b44b371 | 3600 | if (unlikely(needs_lock)) { |
cb3d8972 PB |
3601 | /* |
3602 | * If IORING_SETUP_SQPOLL is enabled, sqes are either handle | |
3603 | * in sq thread task context or in io worker task context. If | |
3604 | * current task context is sq thread, we don't need to check | |
3605 | * whether should wake up sq thread. | |
3606 | */ | |
3607 | if ((ctx->flags & IORING_SETUP_SQPOLL) && | |
3608 | wq_has_sleeper(&ctx->sq_data->wait)) | |
3609 | wake_up(&ctx->sq_data->wait); | |
3610 | ||
3611 | mutex_unlock(&ctx->uring_lock); | |
3612 | } | |
def596e9 JA |
3613 | } |
3614 | ||
4503b767 JA |
3615 | static bool io_bdev_nowait(struct block_device *bdev) |
3616 | { | |
9ba0d0c8 | 3617 | return !bdev || blk_queue_nowait(bdev_get_queue(bdev)); |
4503b767 JA |
3618 | } |
3619 | ||
2b188cc1 JA |
3620 | /* |
3621 | * If we tracked the file through the SCM inflight mechanism, we could support | |
3622 | * any file. For now, just ensure that anything potentially problematic is done | |
3623 | * inline. | |
3624 | */ | |
88459b50 | 3625 | static bool __io_file_supports_nowait(struct file *file, umode_t mode) |
2b188cc1 | 3626 | { |
4503b767 | 3627 | if (S_ISBLK(mode)) { |
4e7b5671 CH |
3628 | if (IS_ENABLED(CONFIG_BLOCK) && |
3629 | io_bdev_nowait(I_BDEV(file->f_mapping->host))) | |
4503b767 JA |
3630 | return true; |
3631 | return false; | |
3632 | } | |
976517f1 | 3633 | if (S_ISSOCK(mode)) |
2b188cc1 | 3634 | return true; |
4503b767 | 3635 | if (S_ISREG(mode)) { |
4e7b5671 CH |
3636 | if (IS_ENABLED(CONFIG_BLOCK) && |
3637 | io_bdev_nowait(file->f_inode->i_sb->s_bdev) && | |
4503b767 JA |
3638 | file->f_op != &io_uring_fops) |
3639 | return true; | |
3640 | return false; | |
3641 | } | |
2b188cc1 | 3642 | |
c5b85625 JA |
3643 | /* any ->read/write should understand O_NONBLOCK */ |
3644 | if (file->f_flags & O_NONBLOCK) | |
3645 | return true; | |
35645ac3 | 3646 | return file->f_mode & FMODE_NOWAIT; |
2b188cc1 | 3647 | } |
c5b85625 | 3648 | |
88459b50 PB |
3649 | /* |
3650 | * If we tracked the file through the SCM inflight mechanism, we could support | |
3651 | * any file. For now, just ensure that anything potentially problematic is done | |
3652 | * inline. | |
3653 | */ | |
3654 | static unsigned int io_file_get_flags(struct file *file) | |
3655 | { | |
3656 | umode_t mode = file_inode(file)->i_mode; | |
3657 | unsigned int res = 0; | |
af197f50 | 3658 | |
88459b50 PB |
3659 | if (S_ISREG(mode)) |
3660 | res |= FFS_ISREG; | |
3661 | if (__io_file_supports_nowait(file, mode)) | |
3662 | res |= FFS_NOWAIT; | |
5e45690a JA |
3663 | if (io_file_need_scm(file)) |
3664 | res |= FFS_SCM; | |
88459b50 | 3665 | return res; |
2b188cc1 JA |
3666 | } |
3667 | ||
35645ac3 | 3668 | static inline bool io_file_supports_nowait(struct io_kiocb *req) |
7b29f92d | 3669 | { |
88459b50 | 3670 | return req->flags & REQ_F_SUPPORT_NOWAIT; |
7b29f92d JA |
3671 | } |
3672 | ||
b9a6b8f9 | 3673 | static int io_prep_rw(struct io_kiocb *req, const struct io_uring_sqe *sqe) |
2b188cc1 | 3674 | { |
9adbd45d | 3675 | struct kiocb *kiocb = &req->rw.kiocb; |
09bb8394 JA |
3676 | unsigned ioprio; |
3677 | int ret; | |
2b188cc1 | 3678 | |
2b188cc1 | 3679 | kiocb->ki_pos = READ_ONCE(sqe->off); |
9adbd45d | 3680 | |
fb27274a PB |
3681 | ioprio = READ_ONCE(sqe->ioprio); |
3682 | if (ioprio) { | |
3683 | ret = ioprio_check_cap(ioprio); | |
3684 | if (ret) | |
3685 | return ret; | |
3686 | ||
3687 | kiocb->ki_ioprio = ioprio; | |
3688 | } else { | |
3689 | kiocb->ki_ioprio = get_current_ioprio(); | |
eae071c9 PB |
3690 | } |
3691 | ||
578c0ee2 | 3692 | req->imu = NULL; |
3529d8c2 JA |
3693 | req->rw.addr = READ_ONCE(sqe->addr); |
3694 | req->rw.len = READ_ONCE(sqe->len); | |
584b0180 | 3695 | req->rw.flags = READ_ONCE(sqe->rw_flags); |
4e906702 | 3696 | /* used for fixed read/write too - just read unconditionally */ |
4f4eeba8 | 3697 | req->buf_index = READ_ONCE(sqe->buf_index); |
2b188cc1 | 3698 | return 0; |
2b188cc1 JA |
3699 | } |
3700 | ||
3701 | static inline void io_rw_done(struct kiocb *kiocb, ssize_t ret) | |
3702 | { | |
3703 | switch (ret) { | |
3704 | case -EIOCBQUEUED: | |
3705 | break; | |
3706 | case -ERESTARTSYS: | |
3707 | case -ERESTARTNOINTR: | |
3708 | case -ERESTARTNOHAND: | |
3709 | case -ERESTART_RESTARTBLOCK: | |
3710 | /* | |
3711 | * We can't just restart the syscall, since previously | |
3712 | * submitted sqes may already be in progress. Just fail this | |
3713 | * IO with EINTR. | |
3714 | */ | |
3715 | ret = -EINTR; | |
df561f66 | 3716 | fallthrough; |
2b188cc1 | 3717 | default: |
6b19b766 | 3718 | kiocb->ki_complete(kiocb, ret); |
2b188cc1 JA |
3719 | } |
3720 | } | |
3721 | ||
b4aec400 | 3722 | static inline loff_t *io_kiocb_update_pos(struct io_kiocb *req) |
d34e1e5b DY |
3723 | { |
3724 | struct kiocb *kiocb = &req->rw.kiocb; | |
3725 | ||
6f83ab22 JA |
3726 | if (kiocb->ki_pos != -1) |
3727 | return &kiocb->ki_pos; | |
3728 | ||
3729 | if (!(req->file->f_mode & FMODE_STREAM)) { | |
3730 | req->flags |= REQ_F_CUR_POS; | |
3731 | kiocb->ki_pos = req->file->f_pos; | |
3732 | return &kiocb->ki_pos; | |
d34e1e5b | 3733 | } |
6f83ab22 JA |
3734 | |
3735 | kiocb->ki_pos = 0; | |
3736 | return NULL; | |
d34e1e5b DY |
3737 | } |
3738 | ||
2ea537ca | 3739 | static void kiocb_done(struct io_kiocb *req, ssize_t ret, |
889fca73 | 3740 | unsigned int issue_flags) |
ba816ad6 | 3741 | { |
e8c2bc1f | 3742 | struct io_async_rw *io = req->async_data; |
ba04291e | 3743 | |
227c0c96 | 3744 | /* add previously done IO, if any */ |
d886e185 | 3745 | if (req_has_async_data(req) && io->bytes_done > 0) { |
227c0c96 | 3746 | if (ret < 0) |
e8c2bc1f | 3747 | ret = io->bytes_done; |
227c0c96 | 3748 | else |
e8c2bc1f | 3749 | ret += io->bytes_done; |
227c0c96 JA |
3750 | } |
3751 | ||
ba04291e | 3752 | if (req->flags & REQ_F_CUR_POS) |
2ea537ca PB |
3753 | req->file->f_pos = req->rw.kiocb.ki_pos; |
3754 | if (ret >= 0 && (req->rw.kiocb.ki_complete == io_complete_rw)) | |
00f6e68b | 3755 | __io_complete_rw(req, ret, issue_flags); |
ba816ad6 | 3756 | else |
2ea537ca | 3757 | io_rw_done(&req->rw.kiocb, ret); |
97284637 | 3758 | |
b66ceaf3 | 3759 | if (req->flags & REQ_F_REISSUE) { |
97284637 | 3760 | req->flags &= ~REQ_F_REISSUE; |
b91ef187 | 3761 | if (io_resubmit_prep(req)) |
773af691 | 3762 | io_req_task_queue_reissue(req); |
b91ef187 PB |
3763 | else |
3764 | io_req_task_queue_fail(req, ret); | |
97284637 | 3765 | } |
ba816ad6 JA |
3766 | } |
3767 | ||
eae071c9 PB |
3768 | static int __io_import_fixed(struct io_kiocb *req, int rw, struct iov_iter *iter, |
3769 | struct io_mapped_ubuf *imu) | |
edafccee | 3770 | { |
9adbd45d | 3771 | size_t len = req->rw.len; |
75769e3f | 3772 | u64 buf_end, buf_addr = req->rw.addr; |
edafccee | 3773 | size_t offset; |
edafccee | 3774 | |
75769e3f | 3775 | if (unlikely(check_add_overflow(buf_addr, (u64)len, &buf_end))) |
edafccee JA |
3776 | return -EFAULT; |
3777 | /* not inside the mapped region */ | |
4751f53d | 3778 | if (unlikely(buf_addr < imu->ubuf || buf_end > imu->ubuf_end)) |
edafccee JA |
3779 | return -EFAULT; |
3780 | ||
3781 | /* | |
3782 | * May not be a start of buffer, set size appropriately | |
3783 | * and advance us to the beginning. | |
3784 | */ | |
3785 | offset = buf_addr - imu->ubuf; | |
3786 | iov_iter_bvec(iter, rw, imu->bvec, imu->nr_bvecs, offset + len); | |
bd11b3a3 JA |
3787 | |
3788 | if (offset) { | |
3789 | /* | |
3790 | * Don't use iov_iter_advance() here, as it's really slow for | |
3791 | * using the latter parts of a big fixed buffer - it iterates | |
3792 | * over each segment manually. We can cheat a bit here, because | |
3793 | * we know that: | |
3794 | * | |
3795 | * 1) it's a BVEC iter, we set it up | |
3796 | * 2) all bvecs are PAGE_SIZE in size, except potentially the | |
3797 | * first and last bvec | |
3798 | * | |
3799 | * So just find our index, and adjust the iterator afterwards. | |
3800 | * If the offset is within the first bvec (or the whole first | |
3801 | * bvec, just use iov_iter_advance(). This makes it easier | |
3802 | * since we can just skip the first segment, which may not | |
3803 | * be PAGE_SIZE aligned. | |
3804 | */ | |
3805 | const struct bio_vec *bvec = imu->bvec; | |
3806 | ||
3807 | if (offset <= bvec->bv_len) { | |
3808 | iov_iter_advance(iter, offset); | |
3809 | } else { | |
3810 | unsigned long seg_skip; | |
3811 | ||
3812 | /* skip first vec */ | |
3813 | offset -= bvec->bv_len; | |
3814 | seg_skip = 1 + (offset >> PAGE_SHIFT); | |
3815 | ||
3816 | iter->bvec = bvec + seg_skip; | |
3817 | iter->nr_segs -= seg_skip; | |
99c79f66 | 3818 | iter->count -= bvec->bv_len + offset; |
bd11b3a3 | 3819 | iter->iov_offset = offset & ~PAGE_MASK; |
bd11b3a3 JA |
3820 | } |
3821 | } | |
3822 | ||
847595de | 3823 | return 0; |
edafccee JA |
3824 | } |
3825 | ||
5106dd6e JA |
3826 | static int io_import_fixed(struct io_kiocb *req, int rw, struct iov_iter *iter, |
3827 | unsigned int issue_flags) | |
eae071c9 | 3828 | { |
eae071c9 PB |
3829 | struct io_mapped_ubuf *imu = req->imu; |
3830 | u16 index, buf_index = req->buf_index; | |
3831 | ||
3832 | if (likely(!imu)) { | |
578c0ee2 PB |
3833 | struct io_ring_ctx *ctx = req->ctx; |
3834 | ||
eae071c9 PB |
3835 | if (unlikely(buf_index >= ctx->nr_user_bufs)) |
3836 | return -EFAULT; | |
5106dd6e | 3837 | io_req_set_rsrc_node(req, ctx, issue_flags); |
eae071c9 PB |
3838 | index = array_index_nospec(buf_index, ctx->nr_user_bufs); |
3839 | imu = READ_ONCE(ctx->user_bufs[index]); | |
3840 | req->imu = imu; | |
3841 | } | |
3842 | return __io_import_fixed(req, rw, iter, imu); | |
3843 | } | |
3844 | ||
9cfc7e94 JA |
3845 | static int io_buffer_add_list(struct io_ring_ctx *ctx, |
3846 | struct io_buffer_list *bl, unsigned int bgid) | |
bcda7baa | 3847 | { |
dbc7d452 | 3848 | bl->bgid = bgid; |
9cfc7e94 JA |
3849 | if (bgid < BGID_ARRAY) |
3850 | return 0; | |
3851 | ||
3852 | return xa_err(xa_store(&ctx->io_bl_xa, bgid, bl, GFP_KERNEL)); | |
dbc7d452 JA |
3853 | } |
3854 | ||
149c69b0 | 3855 | static void __user *io_provided_buffer_select(struct io_kiocb *req, size_t *len, |
984824db | 3856 | struct io_buffer_list *bl) |
bcda7baa | 3857 | { |
e7637a49 JA |
3858 | if (!list_empty(&bl->buf_list)) { |
3859 | struct io_buffer *kbuf; | |
bcda7baa | 3860 | |
dbc7d452 JA |
3861 | kbuf = list_first_entry(&bl->buf_list, struct io_buffer, list); |
3862 | list_del(&kbuf->list); | |
bcda7baa JA |
3863 | if (*len > kbuf->len) |
3864 | *len = kbuf->len; | |
30d51dd4 PB |
3865 | req->flags |= REQ_F_BUFFER_SELECTED; |
3866 | req->kbuf = kbuf; | |
e7637a49 | 3867 | req->buf_index = kbuf->bid; |
984824db | 3868 | return u64_to_user_ptr(kbuf->addr); |
e7637a49 | 3869 | } |
984824db | 3870 | return NULL; |
149c69b0 JA |
3871 | } |
3872 | ||
c7fb1942 JA |
3873 | static void __user *io_ring_buffer_select(struct io_kiocb *req, size_t *len, |
3874 | struct io_buffer_list *bl, | |
3875 | unsigned int issue_flags) | |
3876 | { | |
3877 | struct io_uring_buf_ring *br = bl->buf_ring; | |
3878 | struct io_uring_buf *buf; | |
3879 | __u32 head = bl->head; | |
3880 | ||
3881 | if (unlikely(smp_load_acquire(&br->tail) == head)) { | |
3882 | io_ring_submit_unlock(req->ctx, issue_flags); | |
984824db | 3883 | return NULL; |
c7fb1942 JA |
3884 | } |
3885 | ||
3886 | head &= bl->mask; | |
3887 | if (head < IO_BUFFER_LIST_BUF_PER_PAGE) { | |
3888 | buf = &br->bufs[head]; | |
bcda7baa | 3889 | } else { |
c7fb1942 JA |
3890 | int off = head & (IO_BUFFER_LIST_BUF_PER_PAGE - 1); |
3891 | int index = head / IO_BUFFER_LIST_BUF_PER_PAGE - 1; | |
3892 | buf = page_address(bl->buf_pages[index]); | |
3893 | buf += off; | |
bcda7baa | 3894 | } |
c7fb1942 JA |
3895 | if (*len > buf->len) |
3896 | *len = buf->len; | |
3897 | req->flags |= REQ_F_BUFFER_RING; | |
3898 | req->buf_list = bl; | |
3899 | req->buf_index = buf->bid; | |
bcda7baa | 3900 | |
984824db CH |
3901 | if (issue_flags & IO_URING_F_UNLOCKED) { |
3902 | /* | |
3903 | * If we came in unlocked, we have no choice but to consume the | |
3904 | * buffer here. This does mean it'll be pinned until the IO | |
3905 | * completes. But coming in unlocked means we're in io-wq | |
3906 | * context, hence there should be no further retry. For the | |
3907 | * locked case, the caller must ensure to call the commit when | |
3908 | * the transfer completes (or if we get -EAGAIN and must poll | |
3909 | * or retry). | |
3910 | */ | |
3911 | req->buf_list = NULL; | |
3912 | bl->head++; | |
3913 | } | |
c7fb1942 | 3914 | return u64_to_user_ptr(buf->addr); |
bcda7baa JA |
3915 | } |
3916 | ||
c54d52c2 | 3917 | static void __user *io_buffer_select(struct io_kiocb *req, size_t *len, |
4e906702 | 3918 | unsigned int issue_flags) |
4d954c25 | 3919 | { |
dbc7d452 JA |
3920 | struct io_ring_ctx *ctx = req->ctx; |
3921 | struct io_buffer_list *bl; | |
984824db | 3922 | void __user *ret = NULL; |
bcda7baa | 3923 | |
f8929630 | 3924 | io_ring_submit_lock(req->ctx, issue_flags); |
4d954c25 | 3925 | |
4e906702 | 3926 | bl = io_buffer_get_list(ctx, req->buf_index); |
984824db CH |
3927 | if (likely(bl)) { |
3928 | if (bl->buf_nr_pages) | |
3929 | ret = io_ring_buffer_select(req, len, bl, issue_flags); | |
3930 | else | |
3931 | ret = io_provided_buffer_select(req, len, bl); | |
bcda7baa | 3932 | } |
984824db CH |
3933 | io_ring_submit_unlock(req->ctx, issue_flags); |
3934 | return ret; | |
4d954c25 JA |
3935 | } |
3936 | ||
3937 | #ifdef CONFIG_COMPAT | |
3938 | static ssize_t io_compat_import(struct io_kiocb *req, struct iovec *iov, | |
51aac424 | 3939 | unsigned int issue_flags) |
4d954c25 JA |
3940 | { |
3941 | struct compat_iovec __user *uiov; | |
3942 | compat_ssize_t clen; | |
3943 | void __user *buf; | |
e5b00349 | 3944 | size_t len; |
4d954c25 JA |
3945 | |
3946 | uiov = u64_to_user_ptr(req->rw.addr); | |
3947 | if (!access_ok(uiov, sizeof(*uiov))) | |
3948 | return -EFAULT; | |
3949 | if (__get_user(clen, &uiov->iov_len)) | |
3950 | return -EFAULT; | |
3951 | if (clen < 0) | |
3952 | return -EINVAL; | |
3953 | ||
3954 | len = clen; | |
4e906702 | 3955 | buf = io_buffer_select(req, &len, issue_flags); |
984824db CH |
3956 | if (!buf) |
3957 | return -ENOBUFS; | |
b66e65f4 | 3958 | req->rw.addr = (unsigned long) buf; |
4d954c25 | 3959 | iov[0].iov_base = buf; |
b66e65f4 | 3960 | req->rw.len = iov[0].iov_len = (compat_size_t) len; |
4d954c25 JA |
3961 | return 0; |
3962 | } | |
3963 | #endif | |
3964 | ||
3965 | static ssize_t __io_iov_buffer_select(struct io_kiocb *req, struct iovec *iov, | |
51aac424 | 3966 | unsigned int issue_flags) |
4d954c25 JA |
3967 | { |
3968 | struct iovec __user *uiov = u64_to_user_ptr(req->rw.addr); | |
3969 | void __user *buf; | |
3970 | ssize_t len; | |
3971 | ||
3972 | if (copy_from_user(iov, uiov, sizeof(*uiov))) | |
3973 | return -EFAULT; | |
3974 | ||
3975 | len = iov[0].iov_len; | |
3976 | if (len < 0) | |
3977 | return -EINVAL; | |
4e906702 | 3978 | buf = io_buffer_select(req, &len, issue_flags); |
984824db CH |
3979 | if (!buf) |
3980 | return -ENOBUFS; | |
b66e65f4 | 3981 | req->rw.addr = (unsigned long) buf; |
4d954c25 | 3982 | iov[0].iov_base = buf; |
b66e65f4 | 3983 | req->rw.len = iov[0].iov_len = len; |
4d954c25 JA |
3984 | return 0; |
3985 | } | |
3986 | ||
3987 | static ssize_t io_iov_buffer_select(struct io_kiocb *req, struct iovec *iov, | |
51aac424 | 3988 | unsigned int issue_flags) |
4d954c25 | 3989 | { |
c7fb1942 | 3990 | if (req->flags & (REQ_F_BUFFER_SELECTED|REQ_F_BUFFER_RING)) { |
b66e65f4 JA |
3991 | iov[0].iov_base = u64_to_user_ptr(req->rw.addr); |
3992 | iov[0].iov_len = req->rw.len; | |
4d954c25 | 3993 | return 0; |
dddb3e26 | 3994 | } |
dd201662 | 3995 | if (req->rw.len != 1) |
4d954c25 JA |
3996 | return -EINVAL; |
3997 | ||
3998 | #ifdef CONFIG_COMPAT | |
3999 | if (req->ctx->compat) | |
51aac424 | 4000 | return io_compat_import(req, iov, issue_flags); |
4d954c25 JA |
4001 | #endif |
4002 | ||
51aac424 | 4003 | return __io_iov_buffer_select(req, iov, issue_flags); |
4d954c25 JA |
4004 | } |
4005 | ||
b66e65f4 JA |
4006 | static inline bool io_do_buffer_select(struct io_kiocb *req) |
4007 | { | |
4008 | if (!(req->flags & REQ_F_BUFFER_SELECT)) | |
4009 | return false; | |
c7fb1942 | 4010 | return !(req->flags & (REQ_F_BUFFER_SELECTED|REQ_F_BUFFER_RING)); |
b66e65f4 JA |
4011 | } |
4012 | ||
caa8fe6e PB |
4013 | static struct iovec *__io_import_iovec(int rw, struct io_kiocb *req, |
4014 | struct io_rw_state *s, | |
4015 | unsigned int issue_flags) | |
2b188cc1 | 4016 | { |
5e49c973 | 4017 | struct iov_iter *iter = &s->iter; |
847595de | 4018 | u8 opcode = req->opcode; |
caa8fe6e | 4019 | struct iovec *iovec; |
d1d681b0 PB |
4020 | void __user *buf; |
4021 | size_t sqe_len; | |
4d954c25 | 4022 | ssize_t ret; |
edafccee | 4023 | |
f3251183 | 4024 | if (opcode == IORING_OP_READ_FIXED || opcode == IORING_OP_WRITE_FIXED) { |
5106dd6e | 4025 | ret = io_import_fixed(req, rw, iter, issue_flags); |
f3251183 PB |
4026 | if (ret) |
4027 | return ERR_PTR(ret); | |
4028 | return NULL; | |
4029 | } | |
2b188cc1 | 4030 | |
d1d681b0 PB |
4031 | buf = u64_to_user_ptr(req->rw.addr); |
4032 | sqe_len = req->rw.len; | |
9adbd45d | 4033 | |
3a6820f2 | 4034 | if (opcode == IORING_OP_READ || opcode == IORING_OP_WRITE) { |
b66e65f4 | 4035 | if (io_do_buffer_select(req)) { |
4e906702 | 4036 | buf = io_buffer_select(req, &sqe_len, issue_flags); |
984824db CH |
4037 | if (!buf) |
4038 | return ERR_PTR(-ENOBUFS); | |
b66e65f4 | 4039 | req->rw.addr = (unsigned long) buf; |
3f9d6441 | 4040 | req->rw.len = sqe_len; |
bcda7baa JA |
4041 | } |
4042 | ||
5e49c973 | 4043 | ret = import_single_range(rw, buf, sqe_len, s->fast_iov, iter); |
f3251183 PB |
4044 | if (ret) |
4045 | return ERR_PTR(ret); | |
4046 | return NULL; | |
3a6820f2 JA |
4047 | } |
4048 | ||
caa8fe6e | 4049 | iovec = s->fast_iov; |
4d954c25 | 4050 | if (req->flags & REQ_F_BUFFER_SELECT) { |
caa8fe6e | 4051 | ret = io_iov_buffer_select(req, iovec, issue_flags); |
f3251183 PB |
4052 | if (ret) |
4053 | return ERR_PTR(ret); | |
4054 | iov_iter_init(iter, rw, iovec, 1, iovec->iov_len); | |
4055 | return NULL; | |
4d954c25 JA |
4056 | } |
4057 | ||
caa8fe6e | 4058 | ret = __import_iovec(rw, buf, sqe_len, UIO_FASTIOV, &iovec, iter, |
89cd35c5 | 4059 | req->ctx->compat); |
caa8fe6e PB |
4060 | if (unlikely(ret < 0)) |
4061 | return ERR_PTR(ret); | |
4062 | return iovec; | |
2b188cc1 JA |
4063 | } |
4064 | ||
5e49c973 PB |
4065 | static inline int io_import_iovec(int rw, struct io_kiocb *req, |
4066 | struct iovec **iovec, struct io_rw_state *s, | |
4067 | unsigned int issue_flags) | |
4068 | { | |
caa8fe6e PB |
4069 | *iovec = __io_import_iovec(rw, req, s, issue_flags); |
4070 | if (unlikely(IS_ERR(*iovec))) | |
4071 | return PTR_ERR(*iovec); | |
5e49c973 | 4072 | |
5e49c973 | 4073 | iov_iter_save_state(&s->iter, &s->iter_state); |
caa8fe6e | 4074 | return 0; |
2b188cc1 JA |
4075 | } |
4076 | ||
0fef9483 JA |
4077 | static inline loff_t *io_kiocb_ppos(struct kiocb *kiocb) |
4078 | { | |
5b09e37e | 4079 | return (kiocb->ki_filp->f_mode & FMODE_STREAM) ? NULL : &kiocb->ki_pos; |
0fef9483 JA |
4080 | } |
4081 | ||
31b51510 | 4082 | /* |
32960613 JA |
4083 | * For files that don't have ->read_iter() and ->write_iter(), handle them |
4084 | * by looping over ->read() or ->write() manually. | |
31b51510 | 4085 | */ |
4017eb91 | 4086 | static ssize_t loop_rw_iter(int rw, struct io_kiocb *req, struct iov_iter *iter) |
32960613 | 4087 | { |
4017eb91 JA |
4088 | struct kiocb *kiocb = &req->rw.kiocb; |
4089 | struct file *file = req->file; | |
32960613 | 4090 | ssize_t ret = 0; |
af9c45ec | 4091 | loff_t *ppos; |
32960613 JA |
4092 | |
4093 | /* | |
4094 | * Don't support polled IO through this interface, and we can't | |
4095 | * support non-blocking either. For the latter, this just causes | |
4096 | * the kiocb to be handled from an async context. | |
4097 | */ | |
4098 | if (kiocb->ki_flags & IOCB_HIPRI) | |
4099 | return -EOPNOTSUPP; | |
35645ac3 PB |
4100 | if ((kiocb->ki_flags & IOCB_NOWAIT) && |
4101 | !(kiocb->ki_filp->f_flags & O_NONBLOCK)) | |
32960613 JA |
4102 | return -EAGAIN; |
4103 | ||
af9c45ec DY |
4104 | ppos = io_kiocb_ppos(kiocb); |
4105 | ||
32960613 | 4106 | while (iov_iter_count(iter)) { |
311ae9e1 | 4107 | struct iovec iovec; |
32960613 JA |
4108 | ssize_t nr; |
4109 | ||
311ae9e1 PB |
4110 | if (!iov_iter_is_bvec(iter)) { |
4111 | iovec = iov_iter_iovec(iter); | |
4112 | } else { | |
4017eb91 JA |
4113 | iovec.iov_base = u64_to_user_ptr(req->rw.addr); |
4114 | iovec.iov_len = req->rw.len; | |
311ae9e1 PB |
4115 | } |
4116 | ||
32960613 JA |
4117 | if (rw == READ) { |
4118 | nr = file->f_op->read(file, iovec.iov_base, | |
af9c45ec | 4119 | iovec.iov_len, ppos); |
32960613 JA |
4120 | } else { |
4121 | nr = file->f_op->write(file, iovec.iov_base, | |
af9c45ec | 4122 | iovec.iov_len, ppos); |
32960613 JA |
4123 | } |
4124 | ||
4125 | if (nr < 0) { | |
4126 | if (!ret) | |
4127 | ret = nr; | |
4128 | break; | |
4129 | } | |
5e929367 | 4130 | ret += nr; |
16c8d2df JA |
4131 | if (!iov_iter_is_bvec(iter)) { |
4132 | iov_iter_advance(iter, nr); | |
4133 | } else { | |
16c8d2df | 4134 | req->rw.addr += nr; |
5e929367 JA |
4135 | req->rw.len -= nr; |
4136 | if (!req->rw.len) | |
4137 | break; | |
16c8d2df | 4138 | } |
32960613 JA |
4139 | if (nr != iovec.iov_len) |
4140 | break; | |
32960613 JA |
4141 | } |
4142 | ||
4143 | return ret; | |
4144 | } | |
4145 | ||
ff6165b2 JA |
4146 | static void io_req_map_rw(struct io_kiocb *req, const struct iovec *iovec, |
4147 | const struct iovec *fast_iov, struct iov_iter *iter) | |
f67676d1 | 4148 | { |
e8c2bc1f | 4149 | struct io_async_rw *rw = req->async_data; |
b64e3444 | 4150 | |
538941e2 | 4151 | memcpy(&rw->s.iter, iter, sizeof(*iter)); |
afb87658 | 4152 | rw->free_iovec = iovec; |
227c0c96 | 4153 | rw->bytes_done = 0; |
ff6165b2 | 4154 | /* can only be fixed buffers, no need to do anything */ |
9c3a205c | 4155 | if (iov_iter_is_bvec(iter)) |
ff6165b2 | 4156 | return; |
b64e3444 | 4157 | if (!iovec) { |
ff6165b2 JA |
4158 | unsigned iov_off = 0; |
4159 | ||
538941e2 | 4160 | rw->s.iter.iov = rw->s.fast_iov; |
ff6165b2 JA |
4161 | if (iter->iov != fast_iov) { |
4162 | iov_off = iter->iov - fast_iov; | |
538941e2 | 4163 | rw->s.iter.iov += iov_off; |
ff6165b2 | 4164 | } |
538941e2 PB |
4165 | if (rw->s.fast_iov != fast_iov) |
4166 | memcpy(rw->s.fast_iov + iov_off, fast_iov + iov_off, | |
45097dae | 4167 | sizeof(struct iovec) * iter->nr_segs); |
99bc4c38 PB |
4168 | } else { |
4169 | req->flags |= REQ_F_NEED_CLEANUP; | |
f67676d1 JA |
4170 | } |
4171 | } | |
4172 | ||
8d4af685 | 4173 | static inline bool io_alloc_async_data(struct io_kiocb *req) |
3d9932a8 | 4174 | { |
e8c2bc1f JA |
4175 | WARN_ON_ONCE(!io_op_defs[req->opcode].async_size); |
4176 | req->async_data = kmalloc(io_op_defs[req->opcode].async_size, GFP_KERNEL); | |
d886e185 PB |
4177 | if (req->async_data) { |
4178 | req->flags |= REQ_F_ASYNC_DATA; | |
4179 | return false; | |
4180 | } | |
4181 | return true; | |
3d9932a8 XW |
4182 | } |
4183 | ||
ff6165b2 | 4184 | static int io_setup_async_rw(struct io_kiocb *req, const struct iovec *iovec, |
c88598a9 | 4185 | struct io_rw_state *s, bool force) |
b7bb4f7d | 4186 | { |
26f0505a | 4187 | if (!force && !io_op_defs[req->opcode].needs_async_setup) |
74566df3 | 4188 | return 0; |
d886e185 | 4189 | if (!req_has_async_data(req)) { |
cd658695 JA |
4190 | struct io_async_rw *iorw; |
4191 | ||
6cb78689 | 4192 | if (io_alloc_async_data(req)) { |
6bf985dc | 4193 | kfree(iovec); |
5d204bcf | 4194 | return -ENOMEM; |
6bf985dc | 4195 | } |
b7bb4f7d | 4196 | |
c88598a9 | 4197 | io_req_map_rw(req, iovec, s->fast_iov, &s->iter); |
cd658695 JA |
4198 | iorw = req->async_data; |
4199 | /* we've copied and mapped the iter, ensure state is saved */ | |
538941e2 | 4200 | iov_iter_save_state(&iorw->s.iter, &iorw->s.iter_state); |
5d204bcf | 4201 | } |
b7bb4f7d | 4202 | return 0; |
f67676d1 JA |
4203 | } |
4204 | ||
73debe68 | 4205 | static inline int io_rw_prep_async(struct io_kiocb *req, int rw) |
c3e330a4 | 4206 | { |
e8c2bc1f | 4207 | struct io_async_rw *iorw = req->async_data; |
5e49c973 | 4208 | struct iovec *iov; |
847595de | 4209 | int ret; |
c3e330a4 | 4210 | |
51aac424 | 4211 | /* submission path, ->uring_lock should already be taken */ |
3b44b371 | 4212 | ret = io_import_iovec(rw, req, &iov, &iorw->s, 0); |
c3e330a4 PB |
4213 | if (unlikely(ret < 0)) |
4214 | return ret; | |
4215 | ||
ab0b196c PB |
4216 | iorw->bytes_done = 0; |
4217 | iorw->free_iovec = iov; | |
4218 | if (iov) | |
4219 | req->flags |= REQ_F_NEED_CLEANUP; | |
c3e330a4 PB |
4220 | return 0; |
4221 | } | |
4222 | ||
157dc813 JA |
4223 | static int io_readv_prep_async(struct io_kiocb *req) |
4224 | { | |
4225 | return io_rw_prep_async(req, READ); | |
4226 | } | |
4227 | ||
4228 | static int io_writev_prep_async(struct io_kiocb *req) | |
4229 | { | |
4230 | return io_rw_prep_async(req, WRITE); | |
4231 | } | |
4232 | ||
c1dd91d1 | 4233 | /* |
ffdc8dab | 4234 | * This is our waitqueue callback handler, registered through __folio_lock_async() |
c1dd91d1 JA |
4235 | * when we initially tried to do the IO with the iocb armed our waitqueue. |
4236 | * This gets called when the page is unlocked, and we generally expect that to | |
4237 | * happen when the page IO is completed and the page is now uptodate. This will | |
4238 | * queue a task_work based retry of the operation, attempting to copy the data | |
4239 | * again. If the latter fails because the page was NOT uptodate, then we will | |
4240 | * do a thread based blocking retry of the operation. That's the unexpected | |
4241 | * slow path. | |
4242 | */ | |
bcf5a063 JA |
4243 | static int io_async_buf_func(struct wait_queue_entry *wait, unsigned mode, |
4244 | int sync, void *arg) | |
4245 | { | |
4246 | struct wait_page_queue *wpq; | |
4247 | struct io_kiocb *req = wait->private; | |
bcf5a063 | 4248 | struct wait_page_key *key = arg; |
bcf5a063 JA |
4249 | |
4250 | wpq = container_of(wait, struct wait_page_queue, wait); | |
4251 | ||
cdc8fcb4 LT |
4252 | if (!wake_page_match(wpq, key)) |
4253 | return 0; | |
4254 | ||
c8d317aa | 4255 | req->rw.kiocb.ki_flags &= ~IOCB_WAITQ; |
bcf5a063 | 4256 | list_del_init(&wait->entry); |
921b9054 | 4257 | io_req_task_queue(req); |
bcf5a063 JA |
4258 | return 1; |
4259 | } | |
4260 | ||
c1dd91d1 JA |
4261 | /* |
4262 | * This controls whether a given IO request should be armed for async page | |
4263 | * based retry. If we return false here, the request is handed to the async | |
4264 | * worker threads for retry. If we're doing buffered reads on a regular file, | |
4265 | * we prepare a private wait_page_queue entry and retry the operation. This | |
4266 | * will either succeed because the page is now uptodate and unlocked, or it | |
4267 | * will register a callback when the page is unlocked at IO completion. Through | |
4268 | * that callback, io_uring uses task_work to setup a retry of the operation. | |
4269 | * That retry will attempt the buffered read again. The retry will generally | |
4270 | * succeed, or in rare cases where it fails, we then fall back to using the | |
4271 | * async worker threads for a blocking retry. | |
4272 | */ | |
227c0c96 | 4273 | static bool io_rw_should_retry(struct io_kiocb *req) |
f67676d1 | 4274 | { |
e8c2bc1f JA |
4275 | struct io_async_rw *rw = req->async_data; |
4276 | struct wait_page_queue *wait = &rw->wpq; | |
bcf5a063 | 4277 | struct kiocb *kiocb = &req->rw.kiocb; |
f67676d1 | 4278 | |
bcf5a063 JA |
4279 | /* never retry for NOWAIT, we just complete with -EAGAIN */ |
4280 | if (req->flags & REQ_F_NOWAIT) | |
4281 | return false; | |
f67676d1 | 4282 | |
227c0c96 | 4283 | /* Only for buffered IO */ |
3b2a4439 | 4284 | if (kiocb->ki_flags & (IOCB_DIRECT | IOCB_HIPRI)) |
bcf5a063 | 4285 | return false; |
3b2a4439 | 4286 | |
bcf5a063 JA |
4287 | /* |
4288 | * just use poll if we can, and don't attempt if the fs doesn't | |
4289 | * support callback based unlocks | |
4290 | */ | |
4291 | if (file_can_poll(req->file) || !(req->file->f_mode & FMODE_BUF_RASYNC)) | |
4292 | return false; | |
f67676d1 | 4293 | |
3b2a4439 JA |
4294 | wait->wait.func = io_async_buf_func; |
4295 | wait->wait.private = req; | |
4296 | wait->wait.flags = 0; | |
4297 | INIT_LIST_HEAD(&wait->wait.entry); | |
4298 | kiocb->ki_flags |= IOCB_WAITQ; | |
c8d317aa | 4299 | kiocb->ki_flags &= ~IOCB_NOWAIT; |
3b2a4439 | 4300 | kiocb->ki_waitq = wait; |
3b2a4439 | 4301 | return true; |
bcf5a063 JA |
4302 | } |
4303 | ||
aeab9506 | 4304 | static inline int io_iter_do_read(struct io_kiocb *req, struct iov_iter *iter) |
bcf5a063 | 4305 | { |
607b6fb8 | 4306 | if (likely(req->file->f_op->read_iter)) |
bcf5a063 | 4307 | return call_read_iter(req->file, &req->rw.kiocb, iter); |
2dd2111d | 4308 | else if (req->file->f_op->read) |
4017eb91 | 4309 | return loop_rw_iter(READ, req, iter); |
2dd2111d GH |
4310 | else |
4311 | return -EINVAL; | |
f67676d1 JA |
4312 | } |
4313 | ||
7db30437 ML |
4314 | static bool need_read_all(struct io_kiocb *req) |
4315 | { | |
4316 | return req->flags & REQ_F_ISREG || | |
4317 | S_ISBLK(file_inode(req->file)->i_mode); | |
4318 | } | |
4319 | ||
584b0180 JA |
4320 | static int io_rw_init_file(struct io_kiocb *req, fmode_t mode) |
4321 | { | |
4322 | struct kiocb *kiocb = &req->rw.kiocb; | |
4323 | struct io_ring_ctx *ctx = req->ctx; | |
4324 | struct file *file = req->file; | |
4325 | int ret; | |
4326 | ||
4327 | if (unlikely(!file || !(file->f_mode & mode))) | |
4328 | return -EBADF; | |
4329 | ||
4330 | if (!io_req_ffs_set(req)) | |
4331 | req->flags |= io_file_get_flags(file) << REQ_F_SUPPORT_NOWAIT_BIT; | |
4332 | ||
4333 | kiocb->ki_flags = iocb_flags(file); | |
4334 | ret = kiocb_set_rw_flags(kiocb, req->rw.flags); | |
4335 | if (unlikely(ret)) | |
4336 | return ret; | |
4337 | ||
4338 | /* | |
4339 | * If the file is marked O_NONBLOCK, still allow retry for it if it | |
4340 | * supports async. Otherwise it's impossible to use O_NONBLOCK files | |
4341 | * reliably. If not, or it IOCB_NOWAIT is set, don't retry. | |
4342 | */ | |
4343 | if ((kiocb->ki_flags & IOCB_NOWAIT) || | |
4344 | ((file->f_flags & O_NONBLOCK) && !io_file_supports_nowait(req))) | |
4345 | req->flags |= REQ_F_NOWAIT; | |
4346 | ||
4347 | if (ctx->flags & IORING_SETUP_IOPOLL) { | |
4348 | if (!(kiocb->ki_flags & IOCB_DIRECT) || !file->f_op->iopoll) | |
4349 | return -EOPNOTSUPP; | |
4350 | ||
32452a3e | 4351 | kiocb->private = NULL; |
584b0180 JA |
4352 | kiocb->ki_flags |= IOCB_HIPRI | IOCB_ALLOC_CACHE; |
4353 | kiocb->ki_complete = io_complete_rw_iopoll; | |
4354 | req->iopoll_completed = 0; | |
4355 | } else { | |
4356 | if (kiocb->ki_flags & IOCB_HIPRI) | |
4357 | return -EINVAL; | |
4358 | kiocb->ki_complete = io_complete_rw; | |
4359 | } | |
4360 | ||
4361 | return 0; | |
4362 | } | |
4363 | ||
889fca73 | 4364 | static int io_read(struct io_kiocb *req, unsigned int issue_flags) |
2b188cc1 | 4365 | { |
607b6fb8 | 4366 | struct io_rw_state __s, *s = &__s; |
c88598a9 | 4367 | struct iovec *iovec; |
9adbd45d | 4368 | struct kiocb *kiocb = &req->rw.kiocb; |
45d189c6 | 4369 | bool force_nonblock = issue_flags & IO_URING_F_NONBLOCK; |
d886e185 | 4370 | struct io_async_rw *rw; |
cd658695 | 4371 | ssize_t ret, ret2; |
b4aec400 | 4372 | loff_t *ppos; |
ff6165b2 | 4373 | |
607b6fb8 PB |
4374 | if (!req_has_async_data(req)) { |
4375 | ret = io_import_iovec(READ, req, &iovec, s, issue_flags); | |
4376 | if (unlikely(ret < 0)) | |
4377 | return ret; | |
4378 | } else { | |
2be2eb02 JA |
4379 | /* |
4380 | * Safe and required to re-import if we're using provided | |
4381 | * buffers, as we dropped the selected one before retry. | |
4382 | */ | |
4383 | if (req->flags & REQ_F_BUFFER_SELECT) { | |
4384 | ret = io_import_iovec(READ, req, &iovec, s, issue_flags); | |
4385 | if (unlikely(ret < 0)) | |
4386 | return ret; | |
4387 | } | |
4388 | ||
d886e185 | 4389 | rw = req->async_data; |
c88598a9 | 4390 | s = &rw->s; |
cd658695 JA |
4391 | /* |
4392 | * We come here from an earlier attempt, restore our state to | |
4393 | * match in case it doesn't. It's cheap enough that we don't | |
4394 | * need to make this conditional. | |
4395 | */ | |
c88598a9 | 4396 | iov_iter_restore(&s->iter, &s->iter_state); |
2846c481 | 4397 | iovec = NULL; |
2846c481 | 4398 | } |
584b0180 | 4399 | ret = io_rw_init_file(req, FMODE_READ); |
323b190b JA |
4400 | if (unlikely(ret)) { |
4401 | kfree(iovec); | |
584b0180 | 4402 | return ret; |
323b190b | 4403 | } |
cef216fc | 4404 | req->cqe.res = iov_iter_count(&s->iter); |
2b188cc1 | 4405 | |
607b6fb8 PB |
4406 | if (force_nonblock) { |
4407 | /* If the file doesn't support async, just async punt */ | |
35645ac3 | 4408 | if (unlikely(!io_file_supports_nowait(req))) { |
607b6fb8 PB |
4409 | ret = io_setup_async_rw(req, iovec, s, true); |
4410 | return ret ?: -EAGAIN; | |
4411 | } | |
a88fc400 | 4412 | kiocb->ki_flags |= IOCB_NOWAIT; |
607b6fb8 PB |
4413 | } else { |
4414 | /* Ensure we clear previously set non-block flag */ | |
4415 | kiocb->ki_flags &= ~IOCB_NOWAIT; | |
6713e7a6 | 4416 | } |
9e645e11 | 4417 | |
b4aec400 | 4418 | ppos = io_kiocb_update_pos(req); |
d34e1e5b | 4419 | |
cef216fc | 4420 | ret = rw_verify_area(READ, req->file, ppos, req->cqe.res); |
5ea5dd45 PB |
4421 | if (unlikely(ret)) { |
4422 | kfree(iovec); | |
4423 | return ret; | |
4424 | } | |
2b188cc1 | 4425 | |
c88598a9 | 4426 | ret = io_iter_do_read(req, &s->iter); |
32960613 | 4427 | |
230d50d4 | 4428 | if (ret == -EAGAIN || (req->flags & REQ_F_REISSUE)) { |
6ad7f233 | 4429 | req->flags &= ~REQ_F_REISSUE; |
9af177ee JA |
4430 | /* if we can poll, just do that */ |
4431 | if (req->opcode == IORING_OP_READ && file_can_poll(req->file)) | |
4432 | return -EAGAIN; | |
eefdf30f JA |
4433 | /* IOPOLL retry should happen for io-wq threads */ |
4434 | if (!force_nonblock && !(req->ctx->flags & IORING_SETUP_IOPOLL)) | |
f91daf56 | 4435 | goto done; |
75c668cd PB |
4436 | /* no retry on NONBLOCK nor RWF_NOWAIT */ |
4437 | if (req->flags & REQ_F_NOWAIT) | |
355afaeb | 4438 | goto done; |
f38c7e3a | 4439 | ret = 0; |
230d50d4 JA |
4440 | } else if (ret == -EIOCBQUEUED) { |
4441 | goto out_free; | |
cef216fc | 4442 | } else if (ret == req->cqe.res || ret <= 0 || !force_nonblock || |
7db30437 | 4443 | (req->flags & REQ_F_NOWAIT) || !need_read_all(req)) { |
7335e3bf | 4444 | /* read all, failed, already did sync or don't want to retry */ |
00d23d51 | 4445 | goto done; |
227c0c96 JA |
4446 | } |
4447 | ||
cd658695 JA |
4448 | /* |
4449 | * Don't depend on the iter state matching what was consumed, or being | |
4450 | * untouched in case of error. Restore it and we'll advance it | |
4451 | * manually if we need to. | |
4452 | */ | |
c88598a9 | 4453 | iov_iter_restore(&s->iter, &s->iter_state); |
cd658695 | 4454 | |
c88598a9 | 4455 | ret2 = io_setup_async_rw(req, iovec, s, true); |
6bf985dc PB |
4456 | if (ret2) |
4457 | return ret2; | |
4458 | ||
fe1cdd55 | 4459 | iovec = NULL; |
e8c2bc1f | 4460 | rw = req->async_data; |
c88598a9 | 4461 | s = &rw->s; |
cd658695 JA |
4462 | /* |
4463 | * Now use our persistent iterator and state, if we aren't already. | |
4464 | * We've restored and mapped the iter to match. | |
4465 | */ | |
227c0c96 | 4466 | |
b23df91b | 4467 | do { |
cd658695 JA |
4468 | /* |
4469 | * We end up here because of a partial read, either from | |
4470 | * above or inside this loop. Advance the iter by the bytes | |
4471 | * that were consumed. | |
4472 | */ | |
c88598a9 PB |
4473 | iov_iter_advance(&s->iter, ret); |
4474 | if (!iov_iter_count(&s->iter)) | |
cd658695 | 4475 | break; |
b23df91b | 4476 | rw->bytes_done += ret; |
c88598a9 | 4477 | iov_iter_save_state(&s->iter, &s->iter_state); |
cd658695 | 4478 | |
b23df91b PB |
4479 | /* if we can retry, do so with the callbacks armed */ |
4480 | if (!io_rw_should_retry(req)) { | |
4481 | kiocb->ki_flags &= ~IOCB_WAITQ; | |
4482 | return -EAGAIN; | |
4483 | } | |
4484 | ||
4485 | /* | |
4486 | * Now retry read with the IOCB_WAITQ parts set in the iocb. If | |
4487 | * we get -EIOCBQUEUED, then we'll get a notification when the | |
4488 | * desired page gets unlocked. We can also get a partial read | |
4489 | * here, and if we do, then just retry at the new offset. | |
4490 | */ | |
c88598a9 | 4491 | ret = io_iter_do_read(req, &s->iter); |
b23df91b PB |
4492 | if (ret == -EIOCBQUEUED) |
4493 | return 0; | |
227c0c96 | 4494 | /* we got some bytes, but not all. retry. */ |
b5b0ecb7 | 4495 | kiocb->ki_flags &= ~IOCB_WAITQ; |
c88598a9 | 4496 | iov_iter_restore(&s->iter, &s->iter_state); |
cd658695 | 4497 | } while (ret > 0); |
227c0c96 | 4498 | done: |
2ea537ca | 4499 | kiocb_done(req, ret, issue_flags); |
fe1cdd55 PB |
4500 | out_free: |
4501 | /* it's faster to check here then delegate to kfree */ | |
4502 | if (iovec) | |
4503 | kfree(iovec); | |
5ea5dd45 | 4504 | return 0; |
2b188cc1 JA |
4505 | } |
4506 | ||
889fca73 | 4507 | static int io_write(struct io_kiocb *req, unsigned int issue_flags) |
2b188cc1 | 4508 | { |
607b6fb8 | 4509 | struct io_rw_state __s, *s = &__s; |
c88598a9 | 4510 | struct iovec *iovec; |
9adbd45d | 4511 | struct kiocb *kiocb = &req->rw.kiocb; |
45d189c6 | 4512 | bool force_nonblock = issue_flags & IO_URING_F_NONBLOCK; |
cd658695 | 4513 | ssize_t ret, ret2; |
b4aec400 | 4514 | loff_t *ppos; |
2b188cc1 | 4515 | |
607b6fb8 | 4516 | if (!req_has_async_data(req)) { |
5e49c973 PB |
4517 | ret = io_import_iovec(WRITE, req, &iovec, s, issue_flags); |
4518 | if (unlikely(ret < 0)) | |
2846c481 | 4519 | return ret; |
607b6fb8 PB |
4520 | } else { |
4521 | struct io_async_rw *rw = req->async_data; | |
4522 | ||
4523 | s = &rw->s; | |
4524 | iov_iter_restore(&s->iter, &s->iter_state); | |
2846c481 | 4525 | iovec = NULL; |
2846c481 | 4526 | } |
584b0180 | 4527 | ret = io_rw_init_file(req, FMODE_WRITE); |
323b190b JA |
4528 | if (unlikely(ret)) { |
4529 | kfree(iovec); | |
584b0180 | 4530 | return ret; |
323b190b | 4531 | } |
cef216fc | 4532 | req->cqe.res = iov_iter_count(&s->iter); |
2b188cc1 | 4533 | |
607b6fb8 PB |
4534 | if (force_nonblock) { |
4535 | /* If the file doesn't support async, just async punt */ | |
35645ac3 | 4536 | if (unlikely(!io_file_supports_nowait(req))) |
607b6fb8 | 4537 | goto copy_iov; |
fd6c2e4c | 4538 | |
607b6fb8 PB |
4539 | /* file path doesn't support NOWAIT for non-direct_IO */ |
4540 | if (force_nonblock && !(kiocb->ki_flags & IOCB_DIRECT) && | |
4541 | (req->flags & REQ_F_ISREG)) | |
4542 | goto copy_iov; | |
31b51510 | 4543 | |
607b6fb8 PB |
4544 | kiocb->ki_flags |= IOCB_NOWAIT; |
4545 | } else { | |
4546 | /* Ensure we clear previously set non-block flag */ | |
4547 | kiocb->ki_flags &= ~IOCB_NOWAIT; | |
4548 | } | |
31b51510 | 4549 | |
b4aec400 | 4550 | ppos = io_kiocb_update_pos(req); |
d34e1e5b | 4551 | |
cef216fc | 4552 | ret = rw_verify_area(WRITE, req->file, ppos, req->cqe.res); |
fa15bafb PB |
4553 | if (unlikely(ret)) |
4554 | goto out_free; | |
4ed734b0 | 4555 | |
fa15bafb PB |
4556 | /* |
4557 | * Open-code file_start_write here to grab freeze protection, | |
4558 | * which will be released by another thread in | |
4559 | * io_complete_rw(). Fool lockdep by telling it the lock got | |
4560 | * released so that it doesn't complain about the held lock when | |
4561 | * we return to userspace. | |
4562 | */ | |
4563 | if (req->flags & REQ_F_ISREG) { | |
8a3c84b6 | 4564 | sb_start_write(file_inode(req->file)->i_sb); |
fa15bafb PB |
4565 | __sb_writers_release(file_inode(req->file)->i_sb, |
4566 | SB_FREEZE_WRITE); | |
4567 | } | |
4568 | kiocb->ki_flags |= IOCB_WRITE; | |
4ed734b0 | 4569 | |
35645ac3 | 4570 | if (likely(req->file->f_op->write_iter)) |
c88598a9 | 4571 | ret2 = call_write_iter(req->file, kiocb, &s->iter); |
2dd2111d | 4572 | else if (req->file->f_op->write) |
c88598a9 | 4573 | ret2 = loop_rw_iter(WRITE, req, &s->iter); |
2dd2111d GH |
4574 | else |
4575 | ret2 = -EINVAL; | |
4ed734b0 | 4576 | |
6ad7f233 PB |
4577 | if (req->flags & REQ_F_REISSUE) { |
4578 | req->flags &= ~REQ_F_REISSUE; | |
230d50d4 | 4579 | ret2 = -EAGAIN; |
6ad7f233 | 4580 | } |
230d50d4 | 4581 | |
fa15bafb PB |
4582 | /* |
4583 | * Raw bdev writes will return -EOPNOTSUPP for IOCB_NOWAIT. Just | |
4584 | * retry them without IOCB_NOWAIT. | |
4585 | */ | |
4586 | if (ret2 == -EOPNOTSUPP && (kiocb->ki_flags & IOCB_NOWAIT)) | |
4587 | ret2 = -EAGAIN; | |
75c668cd PB |
4588 | /* no retry on NONBLOCK nor RWF_NOWAIT */ |
4589 | if (ret2 == -EAGAIN && (req->flags & REQ_F_NOWAIT)) | |
355afaeb | 4590 | goto done; |
fa15bafb | 4591 | if (!force_nonblock || ret2 != -EAGAIN) { |
eefdf30f | 4592 | /* IOPOLL retry should happen for io-wq threads */ |
b10841c9 | 4593 | if (ret2 == -EAGAIN && (req->ctx->flags & IORING_SETUP_IOPOLL)) |
eefdf30f | 4594 | goto copy_iov; |
355afaeb | 4595 | done: |
2ea537ca | 4596 | kiocb_done(req, ret2, issue_flags); |
fa15bafb | 4597 | } else { |
f67676d1 | 4598 | copy_iov: |
c88598a9 PB |
4599 | iov_iter_restore(&s->iter, &s->iter_state); |
4600 | ret = io_setup_async_rw(req, iovec, s, false); | |
6bf985dc | 4601 | return ret ?: -EAGAIN; |
2b188cc1 | 4602 | } |
31b51510 | 4603 | out_free: |
f261c168 | 4604 | /* it's reportedly faster than delegating the null check to kfree() */ |
252917c3 | 4605 | if (iovec) |
6f2cc166 | 4606 | kfree(iovec); |
2b188cc1 JA |
4607 | return ret; |
4608 | } | |
4609 | ||
80a261fd JA |
4610 | static int io_renameat_prep(struct io_kiocb *req, |
4611 | const struct io_uring_sqe *sqe) | |
4612 | { | |
4613 | struct io_rename *ren = &req->rename; | |
4614 | const char __user *oldf, *newf; | |
4615 | ||
73911426 | 4616 | if (sqe->buf_index || sqe->splice_fd_in) |
ed7eb259 | 4617 | return -EINVAL; |
80a261fd JA |
4618 | if (unlikely(req->flags & REQ_F_FIXED_FILE)) |
4619 | return -EBADF; | |
4620 | ||
4621 | ren->old_dfd = READ_ONCE(sqe->fd); | |
4622 | oldf = u64_to_user_ptr(READ_ONCE(sqe->addr)); | |
4623 | newf = u64_to_user_ptr(READ_ONCE(sqe->addr2)); | |
4624 | ren->new_dfd = READ_ONCE(sqe->len); | |
4625 | ren->flags = READ_ONCE(sqe->rename_flags); | |
4626 | ||
4627 | ren->oldpath = getname(oldf); | |
4628 | if (IS_ERR(ren->oldpath)) | |
4629 | return PTR_ERR(ren->oldpath); | |
4630 | ||
4631 | ren->newpath = getname(newf); | |
4632 | if (IS_ERR(ren->newpath)) { | |
4633 | putname(ren->oldpath); | |
4634 | return PTR_ERR(ren->newpath); | |
4635 | } | |
4636 | ||
4637 | req->flags |= REQ_F_NEED_CLEANUP; | |
4638 | return 0; | |
4639 | } | |
4640 | ||
45d189c6 | 4641 | static int io_renameat(struct io_kiocb *req, unsigned int issue_flags) |
80a261fd JA |
4642 | { |
4643 | struct io_rename *ren = &req->rename; | |
4644 | int ret; | |
4645 | ||
45d189c6 | 4646 | if (issue_flags & IO_URING_F_NONBLOCK) |
80a261fd JA |
4647 | return -EAGAIN; |
4648 | ||
4649 | ret = do_renameat2(ren->old_dfd, ren->oldpath, ren->new_dfd, | |
4650 | ren->newpath, ren->flags); | |
4651 | ||
4652 | req->flags &= ~REQ_F_NEED_CLEANUP; | |
80a261fd JA |
4653 | io_req_complete(req, ret); |
4654 | return 0; | |
4655 | } | |
4656 | ||
e9621e2b SR |
4657 | static inline void __io_xattr_finish(struct io_kiocb *req) |
4658 | { | |
4659 | struct io_xattr *ix = &req->xattr; | |
4660 | ||
4661 | if (ix->filename) | |
4662 | putname(ix->filename); | |
4663 | ||
4664 | kfree(ix->ctx.kname); | |
4665 | kvfree(ix->ctx.kvalue); | |
4666 | } | |
4667 | ||
4668 | static void io_xattr_finish(struct io_kiocb *req, int ret) | |
4669 | { | |
4670 | req->flags &= ~REQ_F_NEED_CLEANUP; | |
4671 | ||
4672 | __io_xattr_finish(req); | |
e9621e2b SR |
4673 | io_req_complete(req, ret); |
4674 | } | |
4675 | ||
a56834e0 SR |
4676 | static int __io_getxattr_prep(struct io_kiocb *req, |
4677 | const struct io_uring_sqe *sqe) | |
4678 | { | |
4679 | struct io_xattr *ix = &req->xattr; | |
4680 | const char __user *name; | |
4681 | int ret; | |
4682 | ||
a56834e0 SR |
4683 | if (unlikely(req->flags & REQ_F_FIXED_FILE)) |
4684 | return -EBADF; | |
4685 | ||
4686 | ix->filename = NULL; | |
4687 | ix->ctx.kvalue = NULL; | |
4688 | name = u64_to_user_ptr(READ_ONCE(sqe->addr)); | |
4689 | ix->ctx.cvalue = u64_to_user_ptr(READ_ONCE(sqe->addr2)); | |
4690 | ix->ctx.size = READ_ONCE(sqe->len); | |
4691 | ix->ctx.flags = READ_ONCE(sqe->xattr_flags); | |
4692 | ||
4693 | if (ix->ctx.flags) | |
4694 | return -EINVAL; | |
4695 | ||
4696 | ix->ctx.kname = kmalloc(sizeof(*ix->ctx.kname), GFP_KERNEL); | |
4697 | if (!ix->ctx.kname) | |
4698 | return -ENOMEM; | |
4699 | ||
4700 | ret = strncpy_from_user(ix->ctx.kname->name, name, | |
4701 | sizeof(ix->ctx.kname->name)); | |
4702 | if (!ret || ret == sizeof(ix->ctx.kname->name)) | |
4703 | ret = -ERANGE; | |
4704 | if (ret < 0) { | |
4705 | kfree(ix->ctx.kname); | |
4706 | return ret; | |
4707 | } | |
4708 | ||
4709 | req->flags |= REQ_F_NEED_CLEANUP; | |
4710 | return 0; | |
4711 | } | |
4712 | ||
4713 | static int io_fgetxattr_prep(struct io_kiocb *req, | |
4714 | const struct io_uring_sqe *sqe) | |
4715 | { | |
4716 | return __io_getxattr_prep(req, sqe); | |
4717 | } | |
4718 | ||
4719 | static int io_getxattr_prep(struct io_kiocb *req, | |
4720 | const struct io_uring_sqe *sqe) | |
4721 | { | |
4722 | struct io_xattr *ix = &req->xattr; | |
4723 | const char __user *path; | |
4724 | int ret; | |
4725 | ||
4726 | ret = __io_getxattr_prep(req, sqe); | |
4727 | if (ret) | |
4728 | return ret; | |
4729 | ||
4730 | path = u64_to_user_ptr(READ_ONCE(sqe->addr3)); | |
4731 | ||
4732 | ix->filename = getname_flags(path, LOOKUP_FOLLOW, NULL); | |
4733 | if (IS_ERR(ix->filename)) { | |
4734 | ret = PTR_ERR(ix->filename); | |
4735 | ix->filename = NULL; | |
4736 | } | |
4737 | ||
4738 | return ret; | |
4739 | } | |
4740 | ||
4741 | static int io_fgetxattr(struct io_kiocb *req, unsigned int issue_flags) | |
4742 | { | |
4743 | struct io_xattr *ix = &req->xattr; | |
4744 | int ret; | |
4745 | ||
4746 | if (issue_flags & IO_URING_F_NONBLOCK) | |
4747 | return -EAGAIN; | |
4748 | ||
4749 | ret = do_getxattr(mnt_user_ns(req->file->f_path.mnt), | |
4750 | req->file->f_path.dentry, | |
4751 | &ix->ctx); | |
4752 | ||
4753 | io_xattr_finish(req, ret); | |
4754 | return 0; | |
4755 | } | |
4756 | ||
4757 | static int io_getxattr(struct io_kiocb *req, unsigned int issue_flags) | |
4758 | { | |
4759 | struct io_xattr *ix = &req->xattr; | |
4760 | unsigned int lookup_flags = LOOKUP_FOLLOW; | |
4761 | struct path path; | |
4762 | int ret; | |
4763 | ||
4764 | if (issue_flags & IO_URING_F_NONBLOCK) | |
4765 | return -EAGAIN; | |
4766 | ||
4767 | retry: | |
4768 | ret = filename_lookup(AT_FDCWD, ix->filename, lookup_flags, &path, NULL); | |
4769 | if (!ret) { | |
4770 | ret = do_getxattr(mnt_user_ns(path.mnt), | |
4771 | path.dentry, | |
4772 | &ix->ctx); | |
4773 | ||
4774 | path_put(&path); | |
4775 | if (retry_estale(ret, lookup_flags)) { | |
4776 | lookup_flags |= LOOKUP_REVAL; | |
4777 | goto retry; | |
4778 | } | |
4779 | } | |
4780 | ||
4781 | io_xattr_finish(req, ret); | |
4782 | return 0; | |
4783 | } | |
4784 | ||
e9621e2b SR |
4785 | static int __io_setxattr_prep(struct io_kiocb *req, |
4786 | const struct io_uring_sqe *sqe) | |
4787 | { | |
4788 | struct io_xattr *ix = &req->xattr; | |
4789 | const char __user *name; | |
4790 | int ret; | |
4791 | ||
e9621e2b SR |
4792 | if (unlikely(req->flags & REQ_F_FIXED_FILE)) |
4793 | return -EBADF; | |
4794 | ||
4795 | ix->filename = NULL; | |
4796 | name = u64_to_user_ptr(READ_ONCE(sqe->addr)); | |
4797 | ix->ctx.cvalue = u64_to_user_ptr(READ_ONCE(sqe->addr2)); | |
4798 | ix->ctx.kvalue = NULL; | |
4799 | ix->ctx.size = READ_ONCE(sqe->len); | |
4800 | ix->ctx.flags = READ_ONCE(sqe->xattr_flags); | |
4801 | ||
4802 | ix->ctx.kname = kmalloc(sizeof(*ix->ctx.kname), GFP_KERNEL); | |
4803 | if (!ix->ctx.kname) | |
4804 | return -ENOMEM; | |
4805 | ||
4806 | ret = setxattr_copy(name, &ix->ctx); | |
4807 | if (ret) { | |
4808 | kfree(ix->ctx.kname); | |
4809 | return ret; | |
4810 | } | |
4811 | ||
4812 | req->flags |= REQ_F_NEED_CLEANUP; | |
4813 | return 0; | |
4814 | } | |
4815 | ||
4816 | static int io_setxattr_prep(struct io_kiocb *req, | |
4817 | const struct io_uring_sqe *sqe) | |
4818 | { | |
4819 | struct io_xattr *ix = &req->xattr; | |
4820 | const char __user *path; | |
4821 | int ret; | |
4822 | ||
4823 | ret = __io_setxattr_prep(req, sqe); | |
4824 | if (ret) | |
4825 | return ret; | |
4826 | ||
4827 | path = u64_to_user_ptr(READ_ONCE(sqe->addr3)); | |
4828 | ||
4829 | ix->filename = getname_flags(path, LOOKUP_FOLLOW, NULL); | |
4830 | if (IS_ERR(ix->filename)) { | |
4831 | ret = PTR_ERR(ix->filename); | |
4832 | ix->filename = NULL; | |
4833 | } | |
4834 | ||
4835 | return ret; | |
4836 | } | |
4837 | ||
4838 | static int io_fsetxattr_prep(struct io_kiocb *req, | |
4839 | const struct io_uring_sqe *sqe) | |
4840 | { | |
4841 | return __io_setxattr_prep(req, sqe); | |
4842 | } | |
4843 | ||
4844 | static int __io_setxattr(struct io_kiocb *req, unsigned int issue_flags, | |
4845 | struct path *path) | |
4846 | { | |
4847 | struct io_xattr *ix = &req->xattr; | |
4848 | int ret; | |
4849 | ||
4850 | ret = mnt_want_write(path->mnt); | |
4851 | if (!ret) { | |
4852 | ret = do_setxattr(mnt_user_ns(path->mnt), path->dentry, &ix->ctx); | |
4853 | mnt_drop_write(path->mnt); | |
4854 | } | |
4855 | ||
4856 | return ret; | |
4857 | } | |
4858 | ||
4859 | static int io_fsetxattr(struct io_kiocb *req, unsigned int issue_flags) | |
4860 | { | |
4861 | int ret; | |
4862 | ||
4863 | if (issue_flags & IO_URING_F_NONBLOCK) | |
4864 | return -EAGAIN; | |
4865 | ||
4866 | ret = __io_setxattr(req, issue_flags, &req->file->f_path); | |
4867 | io_xattr_finish(req, ret); | |
4868 | ||
4869 | return 0; | |
4870 | } | |
4871 | ||
4872 | static int io_setxattr(struct io_kiocb *req, unsigned int issue_flags) | |
4873 | { | |
4874 | struct io_xattr *ix = &req->xattr; | |
4875 | unsigned int lookup_flags = LOOKUP_FOLLOW; | |
4876 | struct path path; | |
4877 | int ret; | |
4878 | ||
4879 | if (issue_flags & IO_URING_F_NONBLOCK) | |
4880 | return -EAGAIN; | |
4881 | ||
4882 | retry: | |
4883 | ret = filename_lookup(AT_FDCWD, ix->filename, lookup_flags, &path, NULL); | |
4884 | if (!ret) { | |
4885 | ret = __io_setxattr(req, issue_flags, &path); | |
4886 | path_put(&path); | |
4887 | if (retry_estale(ret, lookup_flags)) { | |
4888 | lookup_flags |= LOOKUP_REVAL; | |
4889 | goto retry; | |
4890 | } | |
4891 | } | |
4892 | ||
4893 | io_xattr_finish(req, ret); | |
4894 | return 0; | |
4895 | } | |
4896 | ||
14a1143b JA |
4897 | static int io_unlinkat_prep(struct io_kiocb *req, |
4898 | const struct io_uring_sqe *sqe) | |
4899 | { | |
4900 | struct io_unlink *un = &req->unlink; | |
4901 | const char __user *fname; | |
4902 | ||
73911426 | 4903 | if (sqe->off || sqe->len || sqe->buf_index || sqe->splice_fd_in) |
22634bc5 | 4904 | return -EINVAL; |
14a1143b JA |
4905 | if (unlikely(req->flags & REQ_F_FIXED_FILE)) |
4906 | return -EBADF; | |
4907 | ||
4908 | un->dfd = READ_ONCE(sqe->fd); | |
4909 | ||
4910 | un->flags = READ_ONCE(sqe->unlink_flags); | |
4911 | if (un->flags & ~AT_REMOVEDIR) | |
4912 | return -EINVAL; | |
4913 | ||
4914 | fname = u64_to_user_ptr(READ_ONCE(sqe->addr)); | |
4915 | un->filename = getname(fname); | |
4916 | if (IS_ERR(un->filename)) | |
4917 | return PTR_ERR(un->filename); | |
4918 | ||
4919 | req->flags |= REQ_F_NEED_CLEANUP; | |
4920 | return 0; | |
4921 | } | |
4922 | ||
45d189c6 | 4923 | static int io_unlinkat(struct io_kiocb *req, unsigned int issue_flags) |
14a1143b JA |
4924 | { |
4925 | struct io_unlink *un = &req->unlink; | |
4926 | int ret; | |
4927 | ||
45d189c6 | 4928 | if (issue_flags & IO_URING_F_NONBLOCK) |
14a1143b JA |
4929 | return -EAGAIN; |
4930 | ||
4931 | if (un->flags & AT_REMOVEDIR) | |
4932 | ret = do_rmdir(un->dfd, un->filename); | |
4933 | else | |
4934 | ret = do_unlinkat(un->dfd, un->filename); | |
4935 | ||
4936 | req->flags &= ~REQ_F_NEED_CLEANUP; | |
14a1143b JA |
4937 | io_req_complete(req, ret); |
4938 | return 0; | |
4939 | } | |
4940 | ||
e34a02dc DK |
4941 | static int io_mkdirat_prep(struct io_kiocb *req, |
4942 | const struct io_uring_sqe *sqe) | |
4943 | { | |
4944 | struct io_mkdir *mkd = &req->mkdir; | |
4945 | const char __user *fname; | |
4946 | ||
73911426 | 4947 | if (sqe->off || sqe->rw_flags || sqe->buf_index || sqe->splice_fd_in) |
e34a02dc DK |
4948 | return -EINVAL; |
4949 | if (unlikely(req->flags & REQ_F_FIXED_FILE)) | |
4950 | return -EBADF; | |
4951 | ||
4952 | mkd->dfd = READ_ONCE(sqe->fd); | |
4953 | mkd->mode = READ_ONCE(sqe->len); | |
4954 | ||
4955 | fname = u64_to_user_ptr(READ_ONCE(sqe->addr)); | |
4956 | mkd->filename = getname(fname); | |
4957 | if (IS_ERR(mkd->filename)) | |
4958 | return PTR_ERR(mkd->filename); | |
4959 | ||
4960 | req->flags |= REQ_F_NEED_CLEANUP; | |
4961 | return 0; | |
4962 | } | |
4963 | ||
04f34081 | 4964 | static int io_mkdirat(struct io_kiocb *req, unsigned int issue_flags) |
e34a02dc DK |
4965 | { |
4966 | struct io_mkdir *mkd = &req->mkdir; | |
4967 | int ret; | |
4968 | ||
4969 | if (issue_flags & IO_URING_F_NONBLOCK) | |
4970 | return -EAGAIN; | |
4971 | ||
4972 | ret = do_mkdirat(mkd->dfd, mkd->filename, mkd->mode); | |
4973 | ||
4974 | req->flags &= ~REQ_F_NEED_CLEANUP; | |
e34a02dc DK |
4975 | io_req_complete(req, ret); |
4976 | return 0; | |
4977 | } | |
4978 | ||
7a8721f8 DK |
4979 | static int io_symlinkat_prep(struct io_kiocb *req, |
4980 | const struct io_uring_sqe *sqe) | |
4981 | { | |
4982 | struct io_symlink *sl = &req->symlink; | |
4983 | const char __user *oldpath, *newpath; | |
4984 | ||
73911426 | 4985 | if (sqe->len || sqe->rw_flags || sqe->buf_index || sqe->splice_fd_in) |
7a8721f8 DK |
4986 | return -EINVAL; |
4987 | if (unlikely(req->flags & REQ_F_FIXED_FILE)) | |
4988 | return -EBADF; | |
4989 | ||
4990 | sl->new_dfd = READ_ONCE(sqe->fd); | |
4991 | oldpath = u64_to_user_ptr(READ_ONCE(sqe->addr)); | |
4992 | newpath = u64_to_user_ptr(READ_ONCE(sqe->addr2)); | |
4993 | ||
4994 | sl->oldpath = getname(oldpath); | |
4995 | if (IS_ERR(sl->oldpath)) | |
4996 | return PTR_ERR(sl->oldpath); | |
4997 | ||
4998 | sl->newpath = getname(newpath); | |
4999 | if (IS_ERR(sl->newpath)) { | |
5000 | putname(sl->oldpath); | |
5001 | return PTR_ERR(sl->newpath); | |
5002 | } | |
5003 | ||
5004 | req->flags |= REQ_F_NEED_CLEANUP; | |
5005 | return 0; | |
5006 | } | |
5007 | ||
04f34081 | 5008 | static int io_symlinkat(struct io_kiocb *req, unsigned int issue_flags) |
7a8721f8 DK |
5009 | { |
5010 | struct io_symlink *sl = &req->symlink; | |
5011 | int ret; | |
5012 | ||
5013 | if (issue_flags & IO_URING_F_NONBLOCK) | |
5014 | return -EAGAIN; | |
5015 | ||
5016 | ret = do_symlinkat(sl->oldpath, sl->new_dfd, sl->newpath); | |
5017 | ||
5018 | req->flags &= ~REQ_F_NEED_CLEANUP; | |
7a8721f8 DK |
5019 | io_req_complete(req, ret); |
5020 | return 0; | |
5021 | } | |
5022 | ||
cf30da90 DK |
5023 | static int io_linkat_prep(struct io_kiocb *req, |
5024 | const struct io_uring_sqe *sqe) | |
5025 | { | |
5026 | struct io_hardlink *lnk = &req->hardlink; | |
5027 | const char __user *oldf, *newf; | |
5028 | ||
73911426 | 5029 | if (sqe->rw_flags || sqe->buf_index || sqe->splice_fd_in) |
cf30da90 DK |
5030 | return -EINVAL; |
5031 | if (unlikely(req->flags & REQ_F_FIXED_FILE)) | |
5032 | return -EBADF; | |
5033 | ||
5034 | lnk->old_dfd = READ_ONCE(sqe->fd); | |
5035 | lnk->new_dfd = READ_ONCE(sqe->len); | |
5036 | oldf = u64_to_user_ptr(READ_ONCE(sqe->addr)); | |
5037 | newf = u64_to_user_ptr(READ_ONCE(sqe->addr2)); | |
5038 | lnk->flags = READ_ONCE(sqe->hardlink_flags); | |
5039 | ||
5040 | lnk->oldpath = getname(oldf); | |
5041 | if (IS_ERR(lnk->oldpath)) | |
5042 | return PTR_ERR(lnk->oldpath); | |
5043 | ||
5044 | lnk->newpath = getname(newf); | |
5045 | if (IS_ERR(lnk->newpath)) { | |
5046 | putname(lnk->oldpath); | |
5047 | return PTR_ERR(lnk->newpath); | |
5048 | } | |
5049 | ||
5050 | req->flags |= REQ_F_NEED_CLEANUP; | |
5051 | return 0; | |
5052 | } | |
5053 | ||
04f34081 | 5054 | static int io_linkat(struct io_kiocb *req, unsigned int issue_flags) |
cf30da90 DK |
5055 | { |
5056 | struct io_hardlink *lnk = &req->hardlink; | |
5057 | int ret; | |
5058 | ||
5059 | if (issue_flags & IO_URING_F_NONBLOCK) | |
5060 | return -EAGAIN; | |
5061 | ||
5062 | ret = do_linkat(lnk->old_dfd, lnk->oldpath, lnk->new_dfd, | |
5063 | lnk->newpath, lnk->flags); | |
5064 | ||
5065 | req->flags &= ~REQ_F_NEED_CLEANUP; | |
cf30da90 DK |
5066 | io_req_complete(req, ret); |
5067 | return 0; | |
5068 | } | |
5069 | ||
ee692a21 JA |
5070 | static void io_uring_cmd_work(struct io_kiocb *req, bool *locked) |
5071 | { | |
5072 | req->uring_cmd.task_work_cb(&req->uring_cmd); | |
5073 | } | |
5074 | ||
5075 | void io_uring_cmd_complete_in_task(struct io_uring_cmd *ioucmd, | |
5076 | void (*task_work_cb)(struct io_uring_cmd *)) | |
5077 | { | |
5078 | struct io_kiocb *req = container_of(ioucmd, struct io_kiocb, uring_cmd); | |
5079 | ||
5080 | req->uring_cmd.task_work_cb = task_work_cb; | |
5081 | req->io_task_work.func = io_uring_cmd_work; | |
3fe07bcd | 5082 | io_req_task_prio_work_add(req); |
ee692a21 JA |
5083 | } |
5084 | EXPORT_SYMBOL_GPL(io_uring_cmd_complete_in_task); | |
5085 | ||
5086 | /* | |
5087 | * Called by consumers of io_uring_cmd, if they originally returned | |
5088 | * -EIOCBQUEUED upon receiving the command. | |
5089 | */ | |
5090 | void io_uring_cmd_done(struct io_uring_cmd *ioucmd, ssize_t ret, ssize_t res2) | |
5091 | { | |
5092 | struct io_kiocb *req = container_of(ioucmd, struct io_kiocb, uring_cmd); | |
5093 | ||
5094 | if (ret < 0) | |
5095 | req_set_fail(req); | |
5096 | if (req->ctx->flags & IORING_SETUP_CQE32) | |
5097 | __io_req_complete32(req, 0, ret, 0, res2, 0); | |
5098 | else | |
5099 | io_req_complete(req, ret); | |
5100 | } | |
5101 | EXPORT_SYMBOL_GPL(io_uring_cmd_done); | |
5102 | ||
5103 | static int io_uring_cmd_prep_async(struct io_kiocb *req) | |
5104 | { | |
5105 | size_t cmd_size; | |
5106 | ||
5107 | cmd_size = uring_cmd_pdu_size(req->ctx->flags & IORING_SETUP_SQE128); | |
5108 | ||
5109 | memcpy(req->async_data, req->uring_cmd.cmd, cmd_size); | |
5110 | return 0; | |
5111 | } | |
5112 | ||
5113 | static int io_uring_cmd_prep(struct io_kiocb *req, | |
5114 | const struct io_uring_sqe *sqe) | |
5115 | { | |
5116 | struct io_uring_cmd *ioucmd = &req->uring_cmd; | |
5117 | ||
5118 | if (sqe->rw_flags) | |
5119 | return -EINVAL; | |
5120 | ioucmd->cmd = sqe->cmd; | |
5121 | ioucmd->cmd_op = READ_ONCE(sqe->cmd_op); | |
5122 | return 0; | |
5123 | } | |
5124 | ||
5125 | static int io_uring_cmd(struct io_kiocb *req, unsigned int issue_flags) | |
5126 | { | |
5127 | struct io_uring_cmd *ioucmd = &req->uring_cmd; | |
5128 | struct io_ring_ctx *ctx = req->ctx; | |
5129 | struct file *file = req->file; | |
5130 | int ret; | |
5131 | ||
5132 | if (!req->file->f_op->uring_cmd) | |
5133 | return -EOPNOTSUPP; | |
5134 | ||
5135 | if (ctx->flags & IORING_SETUP_SQE128) | |
5136 | issue_flags |= IO_URING_F_SQE128; | |
5137 | if (ctx->flags & IORING_SETUP_CQE32) | |
5138 | issue_flags |= IO_URING_F_CQE32; | |
5139 | if (ctx->flags & IORING_SETUP_IOPOLL) | |
5140 | issue_flags |= IO_URING_F_IOPOLL; | |
5141 | ||
5142 | if (req_has_async_data(req)) | |
5143 | ioucmd->cmd = req->async_data; | |
5144 | ||
5145 | ret = file->f_op->uring_cmd(ioucmd, issue_flags); | |
5146 | if (ret == -EAGAIN) { | |
5147 | if (!req_has_async_data(req)) { | |
5148 | if (io_alloc_async_data(req)) | |
5149 | return -ENOMEM; | |
5150 | io_uring_cmd_prep_async(req); | |
5151 | } | |
5152 | return -EAGAIN; | |
5153 | } | |
5154 | ||
5155 | if (ret != -EIOCBQUEUED) | |
5156 | io_uring_cmd_done(ioucmd, ret, 0); | |
5157 | return 0; | |
5158 | } | |
5159 | ||
f2a8d5c7 PB |
5160 | static int __io_splice_prep(struct io_kiocb *req, |
5161 | const struct io_uring_sqe *sqe) | |
7d67af2c | 5162 | { |
fe7e3257 | 5163 | struct io_splice *sp = &req->splice; |
7d67af2c | 5164 | unsigned int valid_flags = SPLICE_F_FD_IN_FIXED | SPLICE_F_ALL; |
7d67af2c | 5165 | |
7d67af2c PB |
5166 | sp->len = READ_ONCE(sqe->len); |
5167 | sp->flags = READ_ONCE(sqe->splice_flags); | |
7d67af2c PB |
5168 | if (unlikely(sp->flags & ~valid_flags)) |
5169 | return -EINVAL; | |
a3e4bc23 | 5170 | sp->splice_fd_in = READ_ONCE(sqe->splice_fd_in); |
7d67af2c PB |
5171 | return 0; |
5172 | } | |
5173 | ||
f2a8d5c7 PB |
5174 | static int io_tee_prep(struct io_kiocb *req, |
5175 | const struct io_uring_sqe *sqe) | |
5176 | { | |
5177 | if (READ_ONCE(sqe->splice_off_in) || READ_ONCE(sqe->off)) | |
5178 | return -EINVAL; | |
5179 | return __io_splice_prep(req, sqe); | |
5180 | } | |
5181 | ||
45d189c6 | 5182 | static int io_tee(struct io_kiocb *req, unsigned int issue_flags) |
f2a8d5c7 PB |
5183 | { |
5184 | struct io_splice *sp = &req->splice; | |
f2a8d5c7 PB |
5185 | struct file *out = sp->file_out; |
5186 | unsigned int flags = sp->flags & ~SPLICE_F_FD_IN_FIXED; | |
a3e4bc23 | 5187 | struct file *in; |
f2a8d5c7 PB |
5188 | long ret = 0; |
5189 | ||
45d189c6 | 5190 | if (issue_flags & IO_URING_F_NONBLOCK) |
f2a8d5c7 | 5191 | return -EAGAIN; |
a3e4bc23 | 5192 | |
5106dd6e | 5193 | if (sp->flags & SPLICE_F_FD_IN_FIXED) |
e9419766 | 5194 | in = io_file_get_fixed(req, sp->splice_fd_in, issue_flags); |
5106dd6e JA |
5195 | else |
5196 | in = io_file_get_normal(req, sp->splice_fd_in); | |
a3e4bc23 JA |
5197 | if (!in) { |
5198 | ret = -EBADF; | |
5199 | goto done; | |
5200 | } | |
5201 | ||
f2a8d5c7 PB |
5202 | if (sp->len) |
5203 | ret = do_tee(in, out, sp->len, flags); | |
5204 | ||
e1d767f0 PB |
5205 | if (!(sp->flags & SPLICE_F_FD_IN_FIXED)) |
5206 | io_put_file(in); | |
a3e4bc23 | 5207 | done: |
f2a8d5c7 | 5208 | if (ret != sp->len) |
93d2bcd2 | 5209 | req_set_fail(req); |
4ffaa94b | 5210 | __io_req_complete(req, 0, ret, 0); |
f2a8d5c7 PB |
5211 | return 0; |
5212 | } | |
5213 | ||
5214 | static int io_splice_prep(struct io_kiocb *req, const struct io_uring_sqe *sqe) | |
5215 | { | |
fe7e3257 | 5216 | struct io_splice *sp = &req->splice; |
f2a8d5c7 PB |
5217 | |
5218 | sp->off_in = READ_ONCE(sqe->splice_off_in); | |
5219 | sp->off_out = READ_ONCE(sqe->off); | |
5220 | return __io_splice_prep(req, sqe); | |
5221 | } | |
5222 | ||
45d189c6 | 5223 | static int io_splice(struct io_kiocb *req, unsigned int issue_flags) |
7d67af2c PB |
5224 | { |
5225 | struct io_splice *sp = &req->splice; | |
7d67af2c PB |
5226 | struct file *out = sp->file_out; |
5227 | unsigned int flags = sp->flags & ~SPLICE_F_FD_IN_FIXED; | |
5228 | loff_t *poff_in, *poff_out; | |
a3e4bc23 | 5229 | struct file *in; |
c9687426 | 5230 | long ret = 0; |
7d67af2c | 5231 | |
45d189c6 | 5232 | if (issue_flags & IO_URING_F_NONBLOCK) |
2fb3e822 | 5233 | return -EAGAIN; |
7d67af2c | 5234 | |
5106dd6e | 5235 | if (sp->flags & SPLICE_F_FD_IN_FIXED) |
e9419766 | 5236 | in = io_file_get_fixed(req, sp->splice_fd_in, issue_flags); |
5106dd6e JA |
5237 | else |
5238 | in = io_file_get_normal(req, sp->splice_fd_in); | |
a3e4bc23 JA |
5239 | if (!in) { |
5240 | ret = -EBADF; | |
5241 | goto done; | |
5242 | } | |
5243 | ||
7d67af2c PB |
5244 | poff_in = (sp->off_in == -1) ? NULL : &sp->off_in; |
5245 | poff_out = (sp->off_out == -1) ? NULL : &sp->off_out; | |
c9687426 | 5246 | |
948a7749 | 5247 | if (sp->len) |
c9687426 | 5248 | ret = do_splice(in, poff_in, out, poff_out, sp->len, flags); |
7d67af2c | 5249 | |
e1d767f0 PB |
5250 | if (!(sp->flags & SPLICE_F_FD_IN_FIXED)) |
5251 | io_put_file(in); | |
a3e4bc23 | 5252 | done: |
7d67af2c | 5253 | if (ret != sp->len) |
93d2bcd2 | 5254 | req_set_fail(req); |
4ffaa94b | 5255 | __io_req_complete(req, 0, ret, 0); |
7d67af2c PB |
5256 | return 0; |
5257 | } | |
5258 | ||
2bb04df7 SR |
5259 | static int io_nop_prep(struct io_kiocb *req, const struct io_uring_sqe *sqe) |
5260 | { | |
5261 | /* | |
5262 | * If the ring is setup with CQE32, relay back addr/addr | |
5263 | */ | |
5264 | if (req->ctx->flags & IORING_SETUP_CQE32) { | |
5265 | req->nop.extra1 = READ_ONCE(sqe->addr); | |
5266 | req->nop.extra2 = READ_ONCE(sqe->addr2); | |
5267 | } | |
5268 | ||
5269 | return 0; | |
5270 | } | |
5271 | ||
2b188cc1 JA |
5272 | /* |
5273 | * IORING_OP_NOP just posts a completion event, nothing else. | |
5274 | */ | |
889fca73 | 5275 | static int io_nop(struct io_kiocb *req, unsigned int issue_flags) |
2b188cc1 | 5276 | { |
9836e93c | 5277 | unsigned int cflags; |
3d200242 | 5278 | void __user *buf; |
2b188cc1 | 5279 | |
3d200242 JA |
5280 | if (req->flags & REQ_F_BUFFER_SELECT) { |
5281 | size_t len = 1; | |
5282 | ||
5283 | buf = io_buffer_select(req, &len, issue_flags); | |
984824db CH |
5284 | if (!buf) |
5285 | return -ENOBUFS; | |
3d200242 | 5286 | } |
def596e9 | 5287 | |
9836e93c | 5288 | cflags = io_put_kbuf(req, issue_flags); |
2bb04df7 | 5289 | if (!(req->ctx->flags & IORING_SETUP_CQE32)) |
9836e93c | 5290 | __io_req_complete(req, issue_flags, 0, cflags); |
2bb04df7 | 5291 | else |
9836e93c LT |
5292 | __io_req_complete32(req, issue_flags, 0, cflags, |
5293 | req->nop.extra1, req->nop.extra2); | |
2b188cc1 JA |
5294 | return 0; |
5295 | } | |
5296 | ||
4f57f06c JA |
5297 | static int io_msg_ring_prep(struct io_kiocb *req, |
5298 | const struct io_uring_sqe *sqe) | |
5299 | { | |
73911426 JA |
5300 | if (unlikely(sqe->addr || sqe->rw_flags || sqe->splice_fd_in || |
5301 | sqe->buf_index || sqe->personality)) | |
4f57f06c JA |
5302 | return -EINVAL; |
5303 | ||
4f57f06c JA |
5304 | req->msg.user_data = READ_ONCE(sqe->off); |
5305 | req->msg.len = READ_ONCE(sqe->len); | |
5306 | return 0; | |
5307 | } | |
5308 | ||
5309 | static int io_msg_ring(struct io_kiocb *req, unsigned int issue_flags) | |
5310 | { | |
5311 | struct io_ring_ctx *target_ctx; | |
5312 | struct io_msg *msg = &req->msg; | |
4f57f06c | 5313 | bool filled; |
3f1d52ab | 5314 | int ret; |
4f57f06c | 5315 | |
3f1d52ab JA |
5316 | ret = -EBADFD; |
5317 | if (req->file->f_op != &io_uring_fops) | |
5318 | goto done; | |
4f57f06c | 5319 | |
3f1d52ab | 5320 | ret = -EOVERFLOW; |
4f57f06c JA |
5321 | target_ctx = req->file->private_data; |
5322 | ||
5323 | spin_lock(&target_ctx->completion_lock); | |
7ef66d18 | 5324 | filled = io_fill_cqe_aux(target_ctx, msg->user_data, msg->len, 0); |
4f57f06c JA |
5325 | io_commit_cqring(target_ctx); |
5326 | spin_unlock(&target_ctx->completion_lock); | |
5327 | ||
5328 | if (filled) { | |
5329 | io_cqring_ev_posted(target_ctx); | |
5330 | ret = 0; | |
5331 | } | |
5332 | ||
3f1d52ab | 5333 | done: |
9666d420 JA |
5334 | if (ret < 0) |
5335 | req_set_fail(req); | |
4f57f06c | 5336 | __io_req_complete(req, issue_flags, ret, 0); |
aa184e86 JA |
5337 | /* put file to avoid an attempt to IOPOLL the req */ |
5338 | io_put_file(req->file); | |
5339 | req->file = NULL; | |
4f57f06c JA |
5340 | return 0; |
5341 | } | |
5342 | ||
1155c76a | 5343 | static int io_fsync_prep(struct io_kiocb *req, const struct io_uring_sqe *sqe) |
c992fe29 | 5344 | { |
73911426 | 5345 | if (unlikely(sqe->addr || sqe->buf_index || sqe->splice_fd_in)) |
c992fe29 CH |
5346 | return -EINVAL; |
5347 | ||
8ed8d3c3 JA |
5348 | req->sync.flags = READ_ONCE(sqe->fsync_flags); |
5349 | if (unlikely(req->sync.flags & ~IORING_FSYNC_DATASYNC)) | |
5350 | return -EINVAL; | |
5351 | ||
5352 | req->sync.off = READ_ONCE(sqe->off); | |
5353 | req->sync.len = READ_ONCE(sqe->len); | |
c992fe29 CH |
5354 | return 0; |
5355 | } | |
5356 | ||
45d189c6 | 5357 | static int io_fsync(struct io_kiocb *req, unsigned int issue_flags) |
8ed8d3c3 | 5358 | { |
8ed8d3c3 | 5359 | loff_t end = req->sync.off + req->sync.len; |
8ed8d3c3 JA |
5360 | int ret; |
5361 | ||
ac45abc0 | 5362 | /* fsync always requires a blocking context */ |
45d189c6 | 5363 | if (issue_flags & IO_URING_F_NONBLOCK) |
ac45abc0 PB |
5364 | return -EAGAIN; |
5365 | ||
9adbd45d | 5366 | ret = vfs_fsync_range(req->file, req->sync.off, |
8ed8d3c3 JA |
5367 | end > 0 ? end : LLONG_MAX, |
5368 | req->sync.flags & IORING_FSYNC_DATASYNC); | |
e1e16097 | 5369 | io_req_complete(req, ret); |
c992fe29 CH |
5370 | return 0; |
5371 | } | |
5372 | ||
d63d1b5e JA |
5373 | static int io_fallocate_prep(struct io_kiocb *req, |
5374 | const struct io_uring_sqe *sqe) | |
5375 | { | |
73911426 | 5376 | if (sqe->buf_index || sqe->rw_flags || sqe->splice_fd_in) |
3232dd02 | 5377 | return -EINVAL; |
d63d1b5e JA |
5378 | |
5379 | req->sync.off = READ_ONCE(sqe->off); | |
5380 | req->sync.len = READ_ONCE(sqe->addr); | |
5381 | req->sync.mode = READ_ONCE(sqe->len); | |
5382 | return 0; | |
5383 | } | |
5384 | ||
45d189c6 | 5385 | static int io_fallocate(struct io_kiocb *req, unsigned int issue_flags) |
5d17b4a4 | 5386 | { |
ac45abc0 PB |
5387 | int ret; |
5388 | ||
d63d1b5e | 5389 | /* fallocate always requiring blocking context */ |
45d189c6 | 5390 | if (issue_flags & IO_URING_F_NONBLOCK) |
5d17b4a4 | 5391 | return -EAGAIN; |
ac45abc0 PB |
5392 | ret = vfs_fallocate(req->file, req->sync.mode, req->sync.off, |
5393 | req->sync.len); | |
4ffaa94b | 5394 | if (ret >= 0) |
f63cf519 | 5395 | fsnotify_modify(req->file); |
e1e16097 | 5396 | io_req_complete(req, ret); |
5d17b4a4 JA |
5397 | return 0; |
5398 | } | |
5399 | ||
ec65fea5 | 5400 | static int __io_openat_prep(struct io_kiocb *req, const struct io_uring_sqe *sqe) |
b7bb4f7d | 5401 | { |
f8748881 | 5402 | const char __user *fname; |
15b71abe | 5403 | int ret; |
b7bb4f7d | 5404 | |
73911426 | 5405 | if (unlikely(sqe->buf_index)) |
15b71abe | 5406 | return -EINVAL; |
ec65fea5 | 5407 | if (unlikely(req->flags & REQ_F_FIXED_FILE)) |
cf3040ca | 5408 | return -EBADF; |
03b1230c | 5409 | |
ec65fea5 PB |
5410 | /* open.how should be already initialised */ |
5411 | if (!(req->open.how.flags & O_PATH) && force_o_largefile()) | |
08a1d26e | 5412 | req->open.how.flags |= O_LARGEFILE; |
3529d8c2 | 5413 | |
25e72d10 PB |
5414 | req->open.dfd = READ_ONCE(sqe->fd); |
5415 | fname = u64_to_user_ptr(READ_ONCE(sqe->addr)); | |
f8748881 | 5416 | req->open.filename = getname(fname); |
15b71abe JA |
5417 | if (IS_ERR(req->open.filename)) { |
5418 | ret = PTR_ERR(req->open.filename); | |
5419 | req->open.filename = NULL; | |
5420 | return ret; | |
5421 | } | |
b9445598 PB |
5422 | |
5423 | req->open.file_slot = READ_ONCE(sqe->file_index); | |
5424 | if (req->open.file_slot && (req->open.how.flags & O_CLOEXEC)) | |
5425 | return -EINVAL; | |
5426 | ||
4022e7af | 5427 | req->open.nofile = rlimit(RLIMIT_NOFILE); |
8fef80bf | 5428 | req->flags |= REQ_F_NEED_CLEANUP; |
15b71abe | 5429 | return 0; |
03b1230c JA |
5430 | } |
5431 | ||
ec65fea5 PB |
5432 | static int io_openat_prep(struct io_kiocb *req, const struct io_uring_sqe *sqe) |
5433 | { | |
d3fddf6d PB |
5434 | u64 mode = READ_ONCE(sqe->len); |
5435 | u64 flags = READ_ONCE(sqe->open_flags); | |
ec65fea5 | 5436 | |
ec65fea5 PB |
5437 | req->open.how = build_open_how(flags, mode); |
5438 | return __io_openat_prep(req, sqe); | |
5439 | } | |
5440 | ||
cebdb986 | 5441 | static int io_openat2_prep(struct io_kiocb *req, const struct io_uring_sqe *sqe) |
aa1fa28f | 5442 | { |
cebdb986 | 5443 | struct open_how __user *how; |
cebdb986 | 5444 | size_t len; |
0fa03c62 JA |
5445 | int ret; |
5446 | ||
cebdb986 JA |
5447 | how = u64_to_user_ptr(READ_ONCE(sqe->addr2)); |
5448 | len = READ_ONCE(sqe->len); | |
cebdb986 JA |
5449 | if (len < OPEN_HOW_SIZE_VER0) |
5450 | return -EINVAL; | |
3529d8c2 | 5451 | |
cebdb986 JA |
5452 | ret = copy_struct_from_user(&req->open.how, sizeof(req->open.how), how, |
5453 | len); | |
5454 | if (ret) | |
5455 | return ret; | |
3529d8c2 | 5456 | |
ec65fea5 | 5457 | return __io_openat_prep(req, sqe); |
cebdb986 JA |
5458 | } |
5459 | ||
1339f24b | 5460 | static int io_file_bitmap_get(struct io_ring_ctx *ctx) |
b70b8e33 JA |
5461 | { |
5462 | struct io_file_table *table = &ctx->file_table; | |
5463 | unsigned long nr = ctx->nr_user_files; | |
5464 | int ret; | |
5465 | ||
b70b8e33 JA |
5466 | do { |
5467 | ret = find_next_zero_bit(table->bitmap, nr, table->alloc_hint); | |
4278a0de | 5468 | if (ret != nr) |
b70b8e33 | 5469 | return ret; |
4278a0de | 5470 | |
b70b8e33 JA |
5471 | if (!table->alloc_hint) |
5472 | break; | |
5473 | ||
5474 | nr = table->alloc_hint; | |
5475 | table->alloc_hint = 0; | |
5476 | } while (1); | |
5477 | ||
5478 | return -ENFILE; | |
5479 | } | |
5480 | ||
8c71fe75 XW |
5481 | /* |
5482 | * Note when io_fixed_fd_install() returns error value, it will ensure | |
5483 | * fput() is called correspondingly. | |
5484 | */ | |
1339f24b JA |
5485 | static int io_fixed_fd_install(struct io_kiocb *req, unsigned int issue_flags, |
5486 | struct file *file, unsigned int file_slot) | |
5487 | { | |
5488 | bool alloc_slot = file_slot == IORING_FILE_INDEX_ALLOC; | |
5489 | struct io_ring_ctx *ctx = req->ctx; | |
5490 | int ret; | |
5491 | ||
61c1b44a PB |
5492 | io_ring_submit_lock(ctx, issue_flags); |
5493 | ||
1339f24b | 5494 | if (alloc_slot) { |
1339f24b | 5495 | ret = io_file_bitmap_get(ctx); |
61c1b44a PB |
5496 | if (unlikely(ret < 0)) |
5497 | goto err; | |
1339f24b JA |
5498 | file_slot = ret; |
5499 | } else { | |
5500 | file_slot--; | |
5501 | } | |
5502 | ||
5503 | ret = io_install_fixed_file(req, file, issue_flags, file_slot); | |
61c1b44a PB |
5504 | if (!ret && alloc_slot) |
5505 | ret = file_slot; | |
5506 | err: | |
5507 | io_ring_submit_unlock(ctx, issue_flags); | |
5508 | if (unlikely(ret < 0)) | |
5509 | fput(file); | |
1339f24b JA |
5510 | return ret; |
5511 | } | |
5512 | ||
45d189c6 | 5513 | static int io_openat2(struct io_kiocb *req, unsigned int issue_flags) |
15b71abe JA |
5514 | { |
5515 | struct open_flags op; | |
15b71abe | 5516 | struct file *file; |
b9445598 PB |
5517 | bool resolve_nonblock, nonblock_set; |
5518 | bool fixed = !!req->open.file_slot; | |
15b71abe JA |
5519 | int ret; |
5520 | ||
cebdb986 | 5521 | ret = build_open_flags(&req->open.how, &op); |
15b71abe JA |
5522 | if (ret) |
5523 | goto err; | |
3a81fd02 JA |
5524 | nonblock_set = op.open_flag & O_NONBLOCK; |
5525 | resolve_nonblock = req->open.how.resolve & RESOLVE_CACHED; | |
45d189c6 | 5526 | if (issue_flags & IO_URING_F_NONBLOCK) { |
3a81fd02 JA |
5527 | /* |
5528 | * Don't bother trying for O_TRUNC, O_CREAT, or O_TMPFILE open, | |
5529 | * it'll always -EAGAIN | |
5530 | */ | |
5531 | if (req->open.how.flags & (O_TRUNC | O_CREAT | O_TMPFILE)) | |
5532 | return -EAGAIN; | |
5533 | op.lookup_flags |= LOOKUP_CACHED; | |
5534 | op.open_flag |= O_NONBLOCK; | |
5535 | } | |
15b71abe | 5536 | |
b9445598 PB |
5537 | if (!fixed) { |
5538 | ret = __get_unused_fd_flags(req->open.how.flags, req->open.nofile); | |
5539 | if (ret < 0) | |
5540 | goto err; | |
5541 | } | |
15b71abe JA |
5542 | |
5543 | file = do_filp_open(req->open.dfd, req->open.filename, &op); | |
12dcb58a | 5544 | if (IS_ERR(file)) { |
944d1444 | 5545 | /* |
12dcb58a PB |
5546 | * We could hang on to this 'fd' on retrying, but seems like |
5547 | * marginal gain for something that is now known to be a slower | |
5548 | * path. So just put it, and we'll get a new one when we retry. | |
944d1444 | 5549 | */ |
b9445598 PB |
5550 | if (!fixed) |
5551 | put_unused_fd(ret); | |
3a81fd02 | 5552 | |
15b71abe | 5553 | ret = PTR_ERR(file); |
12dcb58a PB |
5554 | /* only retry if RESOLVE_CACHED wasn't already set by application */ |
5555 | if (ret == -EAGAIN && | |
5556 | (!resolve_nonblock && (issue_flags & IO_URING_F_NONBLOCK))) | |
5557 | return -EAGAIN; | |
5558 | goto err; | |
15b71abe | 5559 | } |
12dcb58a PB |
5560 | |
5561 | if ((issue_flags & IO_URING_F_NONBLOCK) && !nonblock_set) | |
5562 | file->f_flags &= ~O_NONBLOCK; | |
5563 | fsnotify_open(file); | |
b9445598 PB |
5564 | |
5565 | if (!fixed) | |
5566 | fd_install(ret, file); | |
5567 | else | |
1339f24b JA |
5568 | ret = io_fixed_fd_install(req, issue_flags, file, |
5569 | req->open.file_slot); | |
15b71abe JA |
5570 | err: |
5571 | putname(req->open.filename); | |
8fef80bf | 5572 | req->flags &= ~REQ_F_NEED_CLEANUP; |
15b71abe | 5573 | if (ret < 0) |
93d2bcd2 | 5574 | req_set_fail(req); |
0bdf3398 | 5575 | __io_req_complete(req, issue_flags, ret, 0); |
15b71abe JA |
5576 | return 0; |
5577 | } | |
5578 | ||
45d189c6 | 5579 | static int io_openat(struct io_kiocb *req, unsigned int issue_flags) |
cebdb986 | 5580 | { |
e45cff58 | 5581 | return io_openat2(req, issue_flags); |
cebdb986 JA |
5582 | } |
5583 | ||
067524e9 JA |
5584 | static int io_remove_buffers_prep(struct io_kiocb *req, |
5585 | const struct io_uring_sqe *sqe) | |
5586 | { | |
5587 | struct io_provide_buf *p = &req->pbuf; | |
5588 | u64 tmp; | |
5589 | ||
73911426 | 5590 | if (sqe->rw_flags || sqe->addr || sqe->len || sqe->off || |
26578cda | 5591 | sqe->splice_fd_in) |
067524e9 JA |
5592 | return -EINVAL; |
5593 | ||
5594 | tmp = READ_ONCE(sqe->fd); | |
5595 | if (!tmp || tmp > USHRT_MAX) | |
5596 | return -EINVAL; | |
5597 | ||
5598 | memset(p, 0, sizeof(*p)); | |
5599 | p->nbufs = tmp; | |
5600 | p->bgid = READ_ONCE(sqe->buf_group); | |
5601 | return 0; | |
5602 | } | |
5603 | ||
dbc7d452 JA |
5604 | static int __io_remove_buffers(struct io_ring_ctx *ctx, |
5605 | struct io_buffer_list *bl, unsigned nbufs) | |
067524e9 JA |
5606 | { |
5607 | unsigned i = 0; | |
5608 | ||
5609 | /* shouldn't happen */ | |
5610 | if (!nbufs) | |
5611 | return 0; | |
5612 | ||
c7fb1942 JA |
5613 | if (bl->buf_nr_pages) { |
5614 | int j; | |
5615 | ||
5616 | i = bl->buf_ring->tail - bl->head; | |
5617 | for (j = 0; j < bl->buf_nr_pages; j++) | |
5618 | unpin_user_page(bl->buf_pages[j]); | |
5619 | kvfree(bl->buf_pages); | |
5620 | bl->buf_pages = NULL; | |
5621 | bl->buf_nr_pages = 0; | |
1d0dbbfa JA |
5622 | /* make sure it's seen as empty */ |
5623 | INIT_LIST_HEAD(&bl->buf_list); | |
c7fb1942 JA |
5624 | return i; |
5625 | } | |
5626 | ||
067524e9 | 5627 | /* the head kbuf is the list itself */ |
dbc7d452 | 5628 | while (!list_empty(&bl->buf_list)) { |
067524e9 JA |
5629 | struct io_buffer *nxt; |
5630 | ||
dbc7d452 | 5631 | nxt = list_first_entry(&bl->buf_list, struct io_buffer, list); |
067524e9 | 5632 | list_del(&nxt->list); |
067524e9 JA |
5633 | if (++i == nbufs) |
5634 | return i; | |
1d0254e6 | 5635 | cond_resched(); |
067524e9 JA |
5636 | } |
5637 | i++; | |
067524e9 JA |
5638 | |
5639 | return i; | |
5640 | } | |
5641 | ||
889fca73 | 5642 | static int io_remove_buffers(struct io_kiocb *req, unsigned int issue_flags) |
067524e9 JA |
5643 | { |
5644 | struct io_provide_buf *p = &req->pbuf; | |
5645 | struct io_ring_ctx *ctx = req->ctx; | |
dbc7d452 | 5646 | struct io_buffer_list *bl; |
067524e9 | 5647 | int ret = 0; |
067524e9 | 5648 | |
f8929630 | 5649 | io_ring_submit_lock(ctx, issue_flags); |
067524e9 JA |
5650 | |
5651 | ret = -ENOENT; | |
dbc7d452 | 5652 | bl = io_buffer_get_list(ctx, p->bgid); |
c7fb1942 JA |
5653 | if (bl) { |
5654 | ret = -EINVAL; | |
5655 | /* can't use provide/remove buffers command on mapped buffers */ | |
5656 | if (!bl->buf_nr_pages) | |
5657 | ret = __io_remove_buffers(ctx, bl, p->nbufs); | |
5658 | } | |
067524e9 | 5659 | if (ret < 0) |
93d2bcd2 | 5660 | req_set_fail(req); |
067524e9 | 5661 | |
9fb8cb49 PB |
5662 | /* complete before unlock, IOPOLL may need the lock */ |
5663 | __io_req_complete(req, issue_flags, ret, 0); | |
f8929630 | 5664 | io_ring_submit_unlock(ctx, issue_flags); |
067524e9 JA |
5665 | return 0; |
5666 | } | |
5667 | ||
ddf0322d JA |
5668 | static int io_provide_buffers_prep(struct io_kiocb *req, |
5669 | const struct io_uring_sqe *sqe) | |
5670 | { | |
38134ada | 5671 | unsigned long size, tmp_check; |
ddf0322d JA |
5672 | struct io_provide_buf *p = &req->pbuf; |
5673 | u64 tmp; | |
5674 | ||
73911426 | 5675 | if (sqe->rw_flags || sqe->splice_fd_in) |
ddf0322d JA |
5676 | return -EINVAL; |
5677 | ||
5678 | tmp = READ_ONCE(sqe->fd); | |
5679 | if (!tmp || tmp > USHRT_MAX) | |
5680 | return -E2BIG; | |
5681 | p->nbufs = tmp; | |
5682 | p->addr = READ_ONCE(sqe->addr); | |
5683 | p->len = READ_ONCE(sqe->len); | |
5684 | ||
38134ada PB |
5685 | if (check_mul_overflow((unsigned long)p->len, (unsigned long)p->nbufs, |
5686 | &size)) | |
5687 | return -EOVERFLOW; | |
5688 | if (check_add_overflow((unsigned long)p->addr, size, &tmp_check)) | |
5689 | return -EOVERFLOW; | |
5690 | ||
d81269fe PB |
5691 | size = (unsigned long)p->len * p->nbufs; |
5692 | if (!access_ok(u64_to_user_ptr(p->addr), size)) | |
ddf0322d JA |
5693 | return -EFAULT; |
5694 | ||
5695 | p->bgid = READ_ONCE(sqe->buf_group); | |
5696 | tmp = READ_ONCE(sqe->off); | |
5697 | if (tmp > USHRT_MAX) | |
5698 | return -E2BIG; | |
5699 | p->bid = tmp; | |
5700 | return 0; | |
5701 | } | |
5702 | ||
cc3cec83 JA |
5703 | static int io_refill_buffer_cache(struct io_ring_ctx *ctx) |
5704 | { | |
5705 | struct io_buffer *buf; | |
5706 | struct page *page; | |
5707 | int bufs_in_page; | |
5708 | ||
5709 | /* | |
5710 | * Completions that don't happen inline (eg not under uring_lock) will | |
5711 | * add to ->io_buffers_comp. If we don't have any free buffers, check | |
5712 | * the completion list and splice those entries first. | |
5713 | */ | |
5714 | if (!list_empty_careful(&ctx->io_buffers_comp)) { | |
5715 | spin_lock(&ctx->completion_lock); | |
5716 | if (!list_empty(&ctx->io_buffers_comp)) { | |
5717 | list_splice_init(&ctx->io_buffers_comp, | |
5718 | &ctx->io_buffers_cache); | |
5719 | spin_unlock(&ctx->completion_lock); | |
5720 | return 0; | |
5721 | } | |
5722 | spin_unlock(&ctx->completion_lock); | |
5723 | } | |
5724 | ||
5725 | /* | |
5726 | * No free buffers and no completion entries either. Allocate a new | |
5727 | * page worth of buffer entries and add those to our freelist. | |
5728 | */ | |
5729 | page = alloc_page(GFP_KERNEL_ACCOUNT); | |
5730 | if (!page) | |
5731 | return -ENOMEM; | |
5732 | ||
5733 | list_add(&page->lru, &ctx->io_buffers_pages); | |
5734 | ||
5735 | buf = page_address(page); | |
5736 | bufs_in_page = PAGE_SIZE / sizeof(*buf); | |
5737 | while (bufs_in_page) { | |
5738 | list_add_tail(&buf->list, &ctx->io_buffers_cache); | |
5739 | buf++; | |
5740 | bufs_in_page--; | |
5741 | } | |
5742 | ||
5743 | return 0; | |
5744 | } | |
5745 | ||
5746 | static int io_add_buffers(struct io_ring_ctx *ctx, struct io_provide_buf *pbuf, | |
dbc7d452 | 5747 | struct io_buffer_list *bl) |
ddf0322d JA |
5748 | { |
5749 | struct io_buffer *buf; | |
5750 | u64 addr = pbuf->addr; | |
5751 | int i, bid = pbuf->bid; | |
5752 | ||
5753 | for (i = 0; i < pbuf->nbufs; i++) { | |
cc3cec83 JA |
5754 | if (list_empty(&ctx->io_buffers_cache) && |
5755 | io_refill_buffer_cache(ctx)) | |
ddf0322d | 5756 | break; |
cc3cec83 JA |
5757 | buf = list_first_entry(&ctx->io_buffers_cache, struct io_buffer, |
5758 | list); | |
dbc7d452 | 5759 | list_move_tail(&buf->list, &bl->buf_list); |
ddf0322d | 5760 | buf->addr = addr; |
d1f82808 | 5761 | buf->len = min_t(__u32, pbuf->len, MAX_RW_COUNT); |
ddf0322d | 5762 | buf->bid = bid; |
b1c62645 | 5763 | buf->bgid = pbuf->bgid; |
ddf0322d JA |
5764 | addr += pbuf->len; |
5765 | bid++; | |
f240762f | 5766 | cond_resched(); |
ddf0322d JA |
5767 | } |
5768 | ||
dbc7d452 | 5769 | return i ? 0 : -ENOMEM; |
ddf0322d JA |
5770 | } |
5771 | ||
9cfc7e94 JA |
5772 | static __cold int io_init_bl_list(struct io_ring_ctx *ctx) |
5773 | { | |
5774 | int i; | |
5775 | ||
5776 | ctx->io_bl = kcalloc(BGID_ARRAY, sizeof(struct io_buffer_list), | |
5777 | GFP_KERNEL); | |
5778 | if (!ctx->io_bl) | |
5779 | return -ENOMEM; | |
5780 | ||
5781 | for (i = 0; i < BGID_ARRAY; i++) { | |
5782 | INIT_LIST_HEAD(&ctx->io_bl[i].buf_list); | |
5783 | ctx->io_bl[i].bgid = i; | |
5784 | } | |
5785 | ||
5786 | return 0; | |
5787 | } | |
5788 | ||
889fca73 | 5789 | static int io_provide_buffers(struct io_kiocb *req, unsigned int issue_flags) |
ddf0322d JA |
5790 | { |
5791 | struct io_provide_buf *p = &req->pbuf; | |
5792 | struct io_ring_ctx *ctx = req->ctx; | |
dbc7d452 | 5793 | struct io_buffer_list *bl; |
ddf0322d JA |
5794 | int ret = 0; |
5795 | ||
f8929630 | 5796 | io_ring_submit_lock(ctx, issue_flags); |
ddf0322d | 5797 | |
9cfc7e94 JA |
5798 | if (unlikely(p->bgid < BGID_ARRAY && !ctx->io_bl)) { |
5799 | ret = io_init_bl_list(ctx); | |
5800 | if (ret) | |
5801 | goto err; | |
5802 | } | |
ddf0322d | 5803 | |
dbc7d452 JA |
5804 | bl = io_buffer_get_list(ctx, p->bgid); |
5805 | if (unlikely(!bl)) { | |
c7fb1942 | 5806 | bl = kzalloc(sizeof(*bl), GFP_KERNEL); |
dbc7d452 JA |
5807 | if (!bl) { |
5808 | ret = -ENOMEM; | |
5809 | goto err; | |
5810 | } | |
1d0dbbfa | 5811 | INIT_LIST_HEAD(&bl->buf_list); |
9cfc7e94 JA |
5812 | ret = io_buffer_add_list(ctx, bl, p->bgid); |
5813 | if (ret) { | |
5814 | kfree(bl); | |
5815 | goto err; | |
5816 | } | |
ddf0322d | 5817 | } |
c7fb1942 JA |
5818 | /* can't add buffers via this command for a mapped buffer ring */ |
5819 | if (bl->buf_nr_pages) { | |
5820 | ret = -EINVAL; | |
5821 | goto err; | |
ddf0322d | 5822 | } |
dbc7d452 JA |
5823 | |
5824 | ret = io_add_buffers(ctx, p, bl); | |
5825 | err: | |
ddf0322d | 5826 | if (ret < 0) |
93d2bcd2 | 5827 | req_set_fail(req); |
9fb8cb49 PB |
5828 | /* complete before unlock, IOPOLL may need the lock */ |
5829 | __io_req_complete(req, issue_flags, ret, 0); | |
f8929630 | 5830 | io_ring_submit_unlock(ctx, issue_flags); |
ddf0322d | 5831 | return 0; |
cebdb986 JA |
5832 | } |
5833 | ||
3e4827b0 JA |
5834 | static int io_epoll_ctl_prep(struct io_kiocb *req, |
5835 | const struct io_uring_sqe *sqe) | |
5836 | { | |
5837 | #if defined(CONFIG_EPOLL) | |
73911426 | 5838 | if (sqe->buf_index || sqe->splice_fd_in) |
3232dd02 | 5839 | return -EINVAL; |
3e4827b0 JA |
5840 | |
5841 | req->epoll.epfd = READ_ONCE(sqe->fd); | |
5842 | req->epoll.op = READ_ONCE(sqe->len); | |
5843 | req->epoll.fd = READ_ONCE(sqe->off); | |
5844 | ||
5845 | if (ep_op_has_event(req->epoll.op)) { | |
5846 | struct epoll_event __user *ev; | |
5847 | ||
5848 | ev = u64_to_user_ptr(READ_ONCE(sqe->addr)); | |
5849 | if (copy_from_user(&req->epoll.event, ev, sizeof(*ev))) | |
5850 | return -EFAULT; | |
5851 | } | |
5852 | ||
5853 | return 0; | |
5854 | #else | |
5855 | return -EOPNOTSUPP; | |
5856 | #endif | |
5857 | } | |
5858 | ||
889fca73 | 5859 | static int io_epoll_ctl(struct io_kiocb *req, unsigned int issue_flags) |
3e4827b0 JA |
5860 | { |
5861 | #if defined(CONFIG_EPOLL) | |
5862 | struct io_epoll *ie = &req->epoll; | |
5863 | int ret; | |
45d189c6 | 5864 | bool force_nonblock = issue_flags & IO_URING_F_NONBLOCK; |
3e4827b0 JA |
5865 | |
5866 | ret = do_epoll_ctl(ie->epfd, ie->op, ie->fd, &ie->event, force_nonblock); | |
5867 | if (force_nonblock && ret == -EAGAIN) | |
5868 | return -EAGAIN; | |
5869 | ||
5870 | if (ret < 0) | |
93d2bcd2 | 5871 | req_set_fail(req); |
889fca73 | 5872 | __io_req_complete(req, issue_flags, ret, 0); |
3e4827b0 JA |
5873 | return 0; |
5874 | #else | |
5875 | return -EOPNOTSUPP; | |
5876 | #endif | |
5877 | } | |
5878 | ||
c1ca757b JA |
5879 | static int io_madvise_prep(struct io_kiocb *req, const struct io_uring_sqe *sqe) |
5880 | { | |
5881 | #if defined(CONFIG_ADVISE_SYSCALLS) && defined(CONFIG_MMU) | |
73911426 | 5882 | if (sqe->buf_index || sqe->off || sqe->splice_fd_in) |
3232dd02 | 5883 | return -EINVAL; |
c1ca757b JA |
5884 | |
5885 | req->madvise.addr = READ_ONCE(sqe->addr); | |
5886 | req->madvise.len = READ_ONCE(sqe->len); | |
5887 | req->madvise.advice = READ_ONCE(sqe->fadvise_advice); | |
5888 | return 0; | |
5889 | #else | |
5890 | return -EOPNOTSUPP; | |
5891 | #endif | |
5892 | } | |
5893 | ||
45d189c6 | 5894 | static int io_madvise(struct io_kiocb *req, unsigned int issue_flags) |
c1ca757b JA |
5895 | { |
5896 | #if defined(CONFIG_ADVISE_SYSCALLS) && defined(CONFIG_MMU) | |
5897 | struct io_madvise *ma = &req->madvise; | |
5898 | int ret; | |
5899 | ||
45d189c6 | 5900 | if (issue_flags & IO_URING_F_NONBLOCK) |
c1ca757b JA |
5901 | return -EAGAIN; |
5902 | ||
0726b01e | 5903 | ret = do_madvise(current->mm, ma->addr, ma->len, ma->advice); |
e1e16097 | 5904 | io_req_complete(req, ret); |
c1ca757b JA |
5905 | return 0; |
5906 | #else | |
5907 | return -EOPNOTSUPP; | |
5908 | #endif | |
5909 | } | |
5910 | ||
4840e418 JA |
5911 | static int io_fadvise_prep(struct io_kiocb *req, const struct io_uring_sqe *sqe) |
5912 | { | |
73911426 | 5913 | if (sqe->buf_index || sqe->addr || sqe->splice_fd_in) |
3232dd02 | 5914 | return -EINVAL; |
4840e418 JA |
5915 | |
5916 | req->fadvise.offset = READ_ONCE(sqe->off); | |
5917 | req->fadvise.len = READ_ONCE(sqe->len); | |
5918 | req->fadvise.advice = READ_ONCE(sqe->fadvise_advice); | |
5919 | return 0; | |
5920 | } | |
5921 | ||
45d189c6 | 5922 | static int io_fadvise(struct io_kiocb *req, unsigned int issue_flags) |
4840e418 JA |
5923 | { |
5924 | struct io_fadvise *fa = &req->fadvise; | |
5925 | int ret; | |
5926 | ||
45d189c6 | 5927 | if (issue_flags & IO_URING_F_NONBLOCK) { |
3e69426d JA |
5928 | switch (fa->advice) { |
5929 | case POSIX_FADV_NORMAL: | |
5930 | case POSIX_FADV_RANDOM: | |
5931 | case POSIX_FADV_SEQUENTIAL: | |
5932 | break; | |
5933 | default: | |
5934 | return -EAGAIN; | |
5935 | } | |
5936 | } | |
4840e418 JA |
5937 | |
5938 | ret = vfs_fadvise(req->file, fa->offset, fa->len, fa->advice); | |
5939 | if (ret < 0) | |
93d2bcd2 | 5940 | req_set_fail(req); |
0bdf3398 | 5941 | __io_req_complete(req, issue_flags, ret, 0); |
4840e418 JA |
5942 | return 0; |
5943 | } | |
5944 | ||
eddc7ef5 JA |
5945 | static int io_statx_prep(struct io_kiocb *req, const struct io_uring_sqe *sqe) |
5946 | { | |
1b6fe6e0 SR |
5947 | const char __user *path; |
5948 | ||
73911426 | 5949 | if (sqe->buf_index || sqe->splice_fd_in) |
eddc7ef5 | 5950 | return -EINVAL; |
9c280f90 | 5951 | if (req->flags & REQ_F_FIXED_FILE) |
cf3040ca | 5952 | return -EBADF; |
eddc7ef5 | 5953 | |
1d9e1288 BM |
5954 | req->statx.dfd = READ_ONCE(sqe->fd); |
5955 | req->statx.mask = READ_ONCE(sqe->len); | |
1b6fe6e0 | 5956 | path = u64_to_user_ptr(READ_ONCE(sqe->addr)); |
1d9e1288 BM |
5957 | req->statx.buffer = u64_to_user_ptr(READ_ONCE(sqe->addr2)); |
5958 | req->statx.flags = READ_ONCE(sqe->statx_flags); | |
eddc7ef5 | 5959 | |
1b6fe6e0 SR |
5960 | req->statx.filename = getname_flags(path, |
5961 | getname_statx_lookup_flags(req->statx.flags), | |
5962 | NULL); | |
5963 | ||
5964 | if (IS_ERR(req->statx.filename)) { | |
5965 | int ret = PTR_ERR(req->statx.filename); | |
5966 | ||
5967 | req->statx.filename = NULL; | |
5968 | return ret; | |
5969 | } | |
5970 | ||
5971 | req->flags |= REQ_F_NEED_CLEANUP; | |
eddc7ef5 JA |
5972 | return 0; |
5973 | } | |
5974 | ||
45d189c6 | 5975 | static int io_statx(struct io_kiocb *req, unsigned int issue_flags) |
eddc7ef5 | 5976 | { |
1d9e1288 | 5977 | struct io_statx *ctx = &req->statx; |
eddc7ef5 JA |
5978 | int ret; |
5979 | ||
59d70013 | 5980 | if (issue_flags & IO_URING_F_NONBLOCK) |
eddc7ef5 JA |
5981 | return -EAGAIN; |
5982 | ||
e62753e4 BM |
5983 | ret = do_statx(ctx->dfd, ctx->filename, ctx->flags, ctx->mask, |
5984 | ctx->buffer); | |
e1e16097 | 5985 | io_req_complete(req, ret); |
eddc7ef5 JA |
5986 | return 0; |
5987 | } | |
5988 | ||
b5dba59e JA |
5989 | static int io_close_prep(struct io_kiocb *req, const struct io_uring_sqe *sqe) |
5990 | { | |
a7c41b46 | 5991 | if (sqe->off || sqe->addr || sqe->len || sqe->buf_index) |
b5dba59e | 5992 | return -EINVAL; |
9c280f90 | 5993 | if (req->flags & REQ_F_FIXED_FILE) |
cf3040ca | 5994 | return -EBADF; |
b5dba59e JA |
5995 | |
5996 | req->close.fd = READ_ONCE(sqe->fd); | |
7df778be | 5997 | req->close.file_slot = READ_ONCE(sqe->file_index); |
a7c41b46 XW |
5998 | req->close.flags = READ_ONCE(sqe->close_flags); |
5999 | if (req->close.flags & ~IORING_CLOSE_FD_AND_FILE_SLOT) | |
6000 | return -EINVAL; | |
6001 | if (!(req->close.flags & IORING_CLOSE_FD_AND_FILE_SLOT) && | |
6002 | req->close.file_slot && req->close.fd) | |
7df778be PB |
6003 | return -EINVAL; |
6004 | ||
b5dba59e | 6005 | return 0; |
b5dba59e JA |
6006 | } |
6007 | ||
889fca73 | 6008 | static int io_close(struct io_kiocb *req, unsigned int issue_flags) |
b5dba59e | 6009 | { |
9eac1904 | 6010 | struct files_struct *files = current->files; |
3af73b28 | 6011 | struct io_close *close = &req->close; |
9eac1904 | 6012 | struct fdtable *fdt; |
40a19260 | 6013 | struct file *file; |
a1fde923 | 6014 | int ret = -EBADF; |
b5dba59e | 6015 | |
7df778be PB |
6016 | if (req->close.file_slot) { |
6017 | ret = io_close_fixed(req, issue_flags); | |
a7c41b46 XW |
6018 | if (ret || !(req->close.flags & IORING_CLOSE_FD_AND_FILE_SLOT)) |
6019 | goto err; | |
7df778be PB |
6020 | } |
6021 | ||
9eac1904 JA |
6022 | spin_lock(&files->file_lock); |
6023 | fdt = files_fdtable(files); | |
6024 | if (close->fd >= fdt->max_fds) { | |
6025 | spin_unlock(&files->file_lock); | |
6026 | goto err; | |
6027 | } | |
0bf1dbee CH |
6028 | file = rcu_dereference_protected(fdt->fd[close->fd], |
6029 | lockdep_is_held(&files->file_lock)); | |
a1fde923 | 6030 | if (!file || file->f_op == &io_uring_fops) { |
9eac1904 | 6031 | spin_unlock(&files->file_lock); |
9eac1904 | 6032 | goto err; |
3af73b28 | 6033 | } |
b5dba59e JA |
6034 | |
6035 | /* if the file has a flush method, be safe and punt to async */ | |
45d189c6 | 6036 | if (file->f_op->flush && (issue_flags & IO_URING_F_NONBLOCK)) { |
9eac1904 | 6037 | spin_unlock(&files->file_lock); |
0bf0eefd | 6038 | return -EAGAIN; |
a2100672 | 6039 | } |
b5dba59e | 6040 | |
6319194e | 6041 | file = __close_fd_get_file(close->fd); |
9eac1904 | 6042 | spin_unlock(&files->file_lock); |
6319194e | 6043 | if (!file) |
9eac1904 | 6044 | goto err; |
9eac1904 | 6045 | |
3af73b28 | 6046 | /* No ->flush() or already async, safely close from here */ |
9eac1904 JA |
6047 | ret = filp_close(file, current->files); |
6048 | err: | |
3af73b28 | 6049 | if (ret < 0) |
93d2bcd2 | 6050 | req_set_fail(req); |
889fca73 | 6051 | __io_req_complete(req, issue_flags, ret, 0); |
1a417f4e | 6052 | return 0; |
b5dba59e JA |
6053 | } |
6054 | ||
1155c76a | 6055 | static int io_sfr_prep(struct io_kiocb *req, const struct io_uring_sqe *sqe) |
5d17b4a4 | 6056 | { |
73911426 | 6057 | if (unlikely(sqe->addr || sqe->buf_index || sqe->splice_fd_in)) |
5d17b4a4 JA |
6058 | return -EINVAL; |
6059 | ||
8ed8d3c3 JA |
6060 | req->sync.off = READ_ONCE(sqe->off); |
6061 | req->sync.len = READ_ONCE(sqe->len); | |
6062 | req->sync.flags = READ_ONCE(sqe->sync_range_flags); | |
8ed8d3c3 JA |
6063 | return 0; |
6064 | } | |
6065 | ||
45d189c6 | 6066 | static int io_sync_file_range(struct io_kiocb *req, unsigned int issue_flags) |
8ed8d3c3 | 6067 | { |
8ed8d3c3 JA |
6068 | int ret; |
6069 | ||
ac45abc0 | 6070 | /* sync_file_range always requires a blocking context */ |
45d189c6 | 6071 | if (issue_flags & IO_URING_F_NONBLOCK) |
ac45abc0 PB |
6072 | return -EAGAIN; |
6073 | ||
9adbd45d | 6074 | ret = sync_file_range(req->file, req->sync.off, req->sync.len, |
8ed8d3c3 | 6075 | req->sync.flags); |
e1e16097 | 6076 | io_req_complete(req, ret); |
5d17b4a4 JA |
6077 | return 0; |
6078 | } | |
6079 | ||
469956e8 | 6080 | #if defined(CONFIG_NET) |
1151a7cc JA |
6081 | static int io_shutdown_prep(struct io_kiocb *req, |
6082 | const struct io_uring_sqe *sqe) | |
6083 | { | |
6084 | if (unlikely(sqe->off || sqe->addr || sqe->rw_flags || | |
6085 | sqe->buf_index || sqe->splice_fd_in)) | |
6086 | return -EINVAL; | |
6087 | ||
6088 | req->shutdown.how = READ_ONCE(sqe->len); | |
6089 | return 0; | |
6090 | } | |
6091 | ||
6092 | static int io_shutdown(struct io_kiocb *req, unsigned int issue_flags) | |
6093 | { | |
6094 | struct socket *sock; | |
6095 | int ret; | |
6096 | ||
6097 | if (issue_flags & IO_URING_F_NONBLOCK) | |
6098 | return -EAGAIN; | |
6099 | ||
6100 | sock = sock_from_file(req->file); | |
6101 | if (unlikely(!sock)) | |
6102 | return -ENOTSOCK; | |
6103 | ||
6104 | ret = __sys_shutdown_sock(sock, req->shutdown.how); | |
6105 | io_req_complete(req, ret); | |
6106 | return 0; | |
6107 | } | |
6108 | ||
4c3c0943 JA |
6109 | static bool io_net_retry(struct socket *sock, int flags) |
6110 | { | |
6111 | if (!(flags & MSG_WAITALL)) | |
6112 | return false; | |
6113 | return sock->type == SOCK_STREAM || sock->type == SOCK_SEQPACKET; | |
6114 | } | |
6115 | ||
02d27d89 PB |
6116 | static int io_setup_async_msg(struct io_kiocb *req, |
6117 | struct io_async_msghdr *kmsg) | |
6118 | { | |
e8c2bc1f JA |
6119 | struct io_async_msghdr *async_msg = req->async_data; |
6120 | ||
6121 | if (async_msg) | |
02d27d89 | 6122 | return -EAGAIN; |
e8c2bc1f | 6123 | if (io_alloc_async_data(req)) { |
257e84a5 | 6124 | kfree(kmsg->free_iov); |
02d27d89 PB |
6125 | return -ENOMEM; |
6126 | } | |
e8c2bc1f | 6127 | async_msg = req->async_data; |
02d27d89 | 6128 | req->flags |= REQ_F_NEED_CLEANUP; |
e8c2bc1f | 6129 | memcpy(async_msg, kmsg, sizeof(*kmsg)); |
2a780802 | 6130 | async_msg->msg.msg_name = &async_msg->addr; |
257e84a5 PB |
6131 | /* if were using fast_iov, set it to the new one */ |
6132 | if (!async_msg->free_iov) | |
6133 | async_msg->msg.msg_iter.iov = async_msg->fast_iov; | |
6134 | ||
02d27d89 PB |
6135 | return -EAGAIN; |
6136 | } | |
6137 | ||
2ae523ed PB |
6138 | static int io_sendmsg_copy_hdr(struct io_kiocb *req, |
6139 | struct io_async_msghdr *iomsg) | |
6140 | { | |
2ae523ed | 6141 | iomsg->msg.msg_name = &iomsg->addr; |
257e84a5 | 6142 | iomsg->free_iov = iomsg->fast_iov; |
2ae523ed | 6143 | return sendmsg_copy_msghdr(&iomsg->msg, req->sr_msg.umsg, |
257e84a5 | 6144 | req->sr_msg.msg_flags, &iomsg->free_iov); |
2ae523ed PB |
6145 | } |
6146 | ||
93642ef8 PB |
6147 | static int io_sendmsg_prep_async(struct io_kiocb *req) |
6148 | { | |
6149 | int ret; | |
6150 | ||
93642ef8 PB |
6151 | ret = io_sendmsg_copy_hdr(req, req->async_data); |
6152 | if (!ret) | |
6153 | req->flags |= REQ_F_NEED_CLEANUP; | |
6154 | return ret; | |
6155 | } | |
6156 | ||
3529d8c2 | 6157 | static int io_sendmsg_prep(struct io_kiocb *req, const struct io_uring_sqe *sqe) |
03b1230c | 6158 | { |
e47293fd | 6159 | struct io_sr_msg *sr = &req->sr_msg; |
03b1230c | 6160 | |
0455d4cc | 6161 | if (unlikely(sqe->file_index)) |
d2b6f48b | 6162 | return -EINVAL; |
588faa1e JA |
6163 | if (unlikely(sqe->addr2 || sqe->file_index)) |
6164 | return -EINVAL; | |
d2b6f48b | 6165 | |
270a5940 | 6166 | sr->umsg = u64_to_user_ptr(READ_ONCE(sqe->addr)); |
fddaface | 6167 | sr->len = READ_ONCE(sqe->len); |
0455d4cc JA |
6168 | sr->flags = READ_ONCE(sqe->addr2); |
6169 | if (sr->flags & ~IORING_RECVSEND_POLL_FIRST) | |
6170 | return -EINVAL; | |
04411806 PB |
6171 | sr->msg_flags = READ_ONCE(sqe->msg_flags) | MSG_NOSIGNAL; |
6172 | if (sr->msg_flags & MSG_DONTWAIT) | |
6173 | req->flags |= REQ_F_NOWAIT; | |
3529d8c2 | 6174 | |
d8768362 JA |
6175 | #ifdef CONFIG_COMPAT |
6176 | if (req->ctx->compat) | |
6177 | sr->msg_flags |= MSG_CMSG_COMPAT; | |
6178 | #endif | |
4c3c0943 | 6179 | sr->done_io = 0; |
93642ef8 | 6180 | return 0; |
03b1230c JA |
6181 | } |
6182 | ||
889fca73 | 6183 | static int io_sendmsg(struct io_kiocb *req, unsigned int issue_flags) |
aa1fa28f | 6184 | { |
6b754c8b | 6185 | struct io_async_msghdr iomsg, *kmsg; |
4c3c0943 | 6186 | struct io_sr_msg *sr = &req->sr_msg; |
0fa03c62 | 6187 | struct socket *sock; |
7a7cacba | 6188 | unsigned flags; |
0031275d | 6189 | int min_ret = 0; |
0fa03c62 JA |
6190 | int ret; |
6191 | ||
dba4a925 | 6192 | sock = sock_from_file(req->file); |
7a7cacba | 6193 | if (unlikely(!sock)) |
dba4a925 | 6194 | return -ENOTSOCK; |
3529d8c2 | 6195 | |
d886e185 PB |
6196 | if (req_has_async_data(req)) { |
6197 | kmsg = req->async_data; | |
6198 | } else { | |
7a7cacba PB |
6199 | ret = io_sendmsg_copy_hdr(req, &iomsg); |
6200 | if (ret) | |
6201 | return ret; | |
6202 | kmsg = &iomsg; | |
0fa03c62 | 6203 | } |
0fa03c62 | 6204 | |
0455d4cc JA |
6205 | if (!(req->flags & REQ_F_POLLED) && |
6206 | (sr->flags & IORING_RECVSEND_POLL_FIRST)) | |
6207 | return io_setup_async_msg(req, kmsg); | |
6208 | ||
0a352aaa | 6209 | flags = sr->msg_flags; |
04411806 | 6210 | if (issue_flags & IO_URING_F_NONBLOCK) |
7a7cacba | 6211 | flags |= MSG_DONTWAIT; |
0031275d SM |
6212 | if (flags & MSG_WAITALL) |
6213 | min_ret = iov_iter_count(&kmsg->msg.msg_iter); | |
6214 | ||
7a7cacba | 6215 | ret = __sys_sendmsg_sock(sock, &kmsg->msg, flags); |
0fa03c62 | 6216 | |
7297ce3d PB |
6217 | if (ret < min_ret) { |
6218 | if (ret == -EAGAIN && (issue_flags & IO_URING_F_NONBLOCK)) | |
6219 | return io_setup_async_msg(req, kmsg); | |
6220 | if (ret == -ERESTARTSYS) | |
6221 | ret = -EINTR; | |
4c3c0943 JA |
6222 | if (ret > 0 && io_net_retry(sock, flags)) { |
6223 | sr->done_io += ret; | |
6224 | req->flags |= REQ_F_PARTIAL_IO; | |
6225 | return io_setup_async_msg(req, kmsg); | |
6226 | } | |
7297ce3d PB |
6227 | req_set_fail(req); |
6228 | } | |
257e84a5 PB |
6229 | /* fast path, check for non-NULL to avoid function call */ |
6230 | if (kmsg->free_iov) | |
6231 | kfree(kmsg->free_iov); | |
99bc4c38 | 6232 | req->flags &= ~REQ_F_NEED_CLEANUP; |
4c3c0943 JA |
6233 | if (ret >= 0) |
6234 | ret += sr->done_io; | |
6235 | else if (sr->done_io) | |
6236 | ret = sr->done_io; | |
889fca73 | 6237 | __io_req_complete(req, issue_flags, ret, 0); |
5d17b4a4 | 6238 | return 0; |
03b1230c | 6239 | } |
aa1fa28f | 6240 | |
889fca73 | 6241 | static int io_send(struct io_kiocb *req, unsigned int issue_flags) |
fddaface | 6242 | { |
7a7cacba PB |
6243 | struct io_sr_msg *sr = &req->sr_msg; |
6244 | struct msghdr msg; | |
6245 | struct iovec iov; | |
fddaface | 6246 | struct socket *sock; |
7a7cacba | 6247 | unsigned flags; |
0031275d | 6248 | int min_ret = 0; |
fddaface JA |
6249 | int ret; |
6250 | ||
0455d4cc JA |
6251 | if (!(req->flags & REQ_F_POLLED) && |
6252 | (sr->flags & IORING_RECVSEND_POLL_FIRST)) | |
6253 | return -EAGAIN; | |
6254 | ||
dba4a925 | 6255 | sock = sock_from_file(req->file); |
7a7cacba | 6256 | if (unlikely(!sock)) |
dba4a925 | 6257 | return -ENOTSOCK; |
fddaface | 6258 | |
7a7cacba PB |
6259 | ret = import_single_range(WRITE, sr->buf, sr->len, &iov, &msg.msg_iter); |
6260 | if (unlikely(ret)) | |
14db8411 | 6261 | return ret; |
fddaface | 6262 | |
7a7cacba PB |
6263 | msg.msg_name = NULL; |
6264 | msg.msg_control = NULL; | |
6265 | msg.msg_controllen = 0; | |
6266 | msg.msg_namelen = 0; | |
fddaface | 6267 | |
0a352aaa | 6268 | flags = sr->msg_flags; |
04411806 | 6269 | if (issue_flags & IO_URING_F_NONBLOCK) |
7a7cacba | 6270 | flags |= MSG_DONTWAIT; |
0031275d SM |
6271 | if (flags & MSG_WAITALL) |
6272 | min_ret = iov_iter_count(&msg.msg_iter); | |
6273 | ||
7a7cacba PB |
6274 | msg.msg_flags = flags; |
6275 | ret = sock_sendmsg(sock, &msg); | |
7297ce3d PB |
6276 | if (ret < min_ret) { |
6277 | if (ret == -EAGAIN && (issue_flags & IO_URING_F_NONBLOCK)) | |
6278 | return -EAGAIN; | |
6279 | if (ret == -ERESTARTSYS) | |
6280 | ret = -EINTR; | |
4c3c0943 JA |
6281 | if (ret > 0 && io_net_retry(sock, flags)) { |
6282 | sr->len -= ret; | |
6283 | sr->buf += ret; | |
6284 | sr->done_io += ret; | |
6285 | req->flags |= REQ_F_PARTIAL_IO; | |
6286 | return -EAGAIN; | |
6287 | } | |
93d2bcd2 | 6288 | req_set_fail(req); |
7297ce3d | 6289 | } |
4c3c0943 JA |
6290 | if (ret >= 0) |
6291 | ret += sr->done_io; | |
6292 | else if (sr->done_io) | |
6293 | ret = sr->done_io; | |
889fca73 | 6294 | __io_req_complete(req, issue_flags, ret, 0); |
fddaface | 6295 | return 0; |
fddaface JA |
6296 | } |
6297 | ||
1400e697 PB |
6298 | static int __io_recvmsg_copy_hdr(struct io_kiocb *req, |
6299 | struct io_async_msghdr *iomsg) | |
52de1fe1 JA |
6300 | { |
6301 | struct io_sr_msg *sr = &req->sr_msg; | |
6302 | struct iovec __user *uiov; | |
6303 | size_t iov_len; | |
6304 | int ret; | |
6305 | ||
1400e697 PB |
6306 | ret = __copy_msghdr_from_user(&iomsg->msg, sr->umsg, |
6307 | &iomsg->uaddr, &uiov, &iov_len); | |
52de1fe1 JA |
6308 | if (ret) |
6309 | return ret; | |
6310 | ||
6311 | if (req->flags & REQ_F_BUFFER_SELECT) { | |
6312 | if (iov_len > 1) | |
6313 | return -EINVAL; | |
5476dfed | 6314 | if (copy_from_user(iomsg->fast_iov, uiov, sizeof(*uiov))) |
52de1fe1 | 6315 | return -EFAULT; |
5476dfed | 6316 | sr->len = iomsg->fast_iov[0].iov_len; |
257e84a5 | 6317 | iomsg->free_iov = NULL; |
52de1fe1 | 6318 | } else { |
257e84a5 | 6319 | iomsg->free_iov = iomsg->fast_iov; |
89cd35c5 | 6320 | ret = __import_iovec(READ, uiov, iov_len, UIO_FASTIOV, |
257e84a5 | 6321 | &iomsg->free_iov, &iomsg->msg.msg_iter, |
89cd35c5 | 6322 | false); |
52de1fe1 JA |
6323 | if (ret > 0) |
6324 | ret = 0; | |
6325 | } | |
6326 | ||
6327 | return ret; | |
6328 | } | |
6329 | ||
6330 | #ifdef CONFIG_COMPAT | |
6331 | static int __io_compat_recvmsg_copy_hdr(struct io_kiocb *req, | |
1400e697 | 6332 | struct io_async_msghdr *iomsg) |
52de1fe1 | 6333 | { |
52de1fe1 JA |
6334 | struct io_sr_msg *sr = &req->sr_msg; |
6335 | struct compat_iovec __user *uiov; | |
6336 | compat_uptr_t ptr; | |
6337 | compat_size_t len; | |
6338 | int ret; | |
6339 | ||
4af3417a PB |
6340 | ret = __get_compat_msghdr(&iomsg->msg, sr->umsg_compat, &iomsg->uaddr, |
6341 | &ptr, &len); | |
52de1fe1 JA |
6342 | if (ret) |
6343 | return ret; | |
6344 | ||
6345 | uiov = compat_ptr(ptr); | |
6346 | if (req->flags & REQ_F_BUFFER_SELECT) { | |
6347 | compat_ssize_t clen; | |
6348 | ||
6349 | if (len > 1) | |
6350 | return -EINVAL; | |
6351 | if (!access_ok(uiov, sizeof(*uiov))) | |
6352 | return -EFAULT; | |
6353 | if (__get_user(clen, &uiov->iov_len)) | |
6354 | return -EFAULT; | |
6355 | if (clen < 0) | |
6356 | return -EINVAL; | |
2d280bc8 | 6357 | sr->len = clen; |
257e84a5 | 6358 | iomsg->free_iov = NULL; |
52de1fe1 | 6359 | } else { |
257e84a5 | 6360 | iomsg->free_iov = iomsg->fast_iov; |
89cd35c5 | 6361 | ret = __import_iovec(READ, (struct iovec __user *)uiov, len, |
257e84a5 | 6362 | UIO_FASTIOV, &iomsg->free_iov, |
89cd35c5 | 6363 | &iomsg->msg.msg_iter, true); |
52de1fe1 JA |
6364 | if (ret < 0) |
6365 | return ret; | |
6366 | } | |
6367 | ||
6368 | return 0; | |
6369 | } | |
6370 | #endif | |
6371 | ||
1400e697 PB |
6372 | static int io_recvmsg_copy_hdr(struct io_kiocb *req, |
6373 | struct io_async_msghdr *iomsg) | |
52de1fe1 | 6374 | { |
1400e697 | 6375 | iomsg->msg.msg_name = &iomsg->addr; |
52de1fe1 JA |
6376 | |
6377 | #ifdef CONFIG_COMPAT | |
6378 | if (req->ctx->compat) | |
1400e697 | 6379 | return __io_compat_recvmsg_copy_hdr(req, iomsg); |
fddaface | 6380 | #endif |
52de1fe1 | 6381 | |
1400e697 | 6382 | return __io_recvmsg_copy_hdr(req, iomsg); |
52de1fe1 JA |
6383 | } |
6384 | ||
93642ef8 | 6385 | static int io_recvmsg_prep_async(struct io_kiocb *req) |
aa1fa28f | 6386 | { |
99bc4c38 | 6387 | int ret; |
3529d8c2 | 6388 | |
93642ef8 PB |
6389 | ret = io_recvmsg_copy_hdr(req, req->async_data); |
6390 | if (!ret) | |
6391 | req->flags |= REQ_F_NEED_CLEANUP; | |
6392 | return ret; | |
6393 | } | |
6394 | ||
6395 | static int io_recvmsg_prep(struct io_kiocb *req, const struct io_uring_sqe *sqe) | |
6396 | { | |
6397 | struct io_sr_msg *sr = &req->sr_msg; | |
6398 | ||
0455d4cc | 6399 | if (unlikely(sqe->file_index)) |
d2b6f48b | 6400 | return -EINVAL; |
5a1e99b6 JA |
6401 | if (unlikely(sqe->addr2 || sqe->file_index)) |
6402 | return -EINVAL; | |
d2b6f48b | 6403 | |
270a5940 | 6404 | sr->umsg = u64_to_user_ptr(READ_ONCE(sqe->addr)); |
0b7b21e4 | 6405 | sr->len = READ_ONCE(sqe->len); |
0455d4cc JA |
6406 | sr->flags = READ_ONCE(sqe->addr2); |
6407 | if (sr->flags & ~IORING_RECVSEND_POLL_FIRST) | |
6408 | return -EINVAL; | |
04411806 PB |
6409 | sr->msg_flags = READ_ONCE(sqe->msg_flags) | MSG_NOSIGNAL; |
6410 | if (sr->msg_flags & MSG_DONTWAIT) | |
6411 | req->flags |= REQ_F_NOWAIT; | |
06b76d44 | 6412 | |
d8768362 JA |
6413 | #ifdef CONFIG_COMPAT |
6414 | if (req->ctx->compat) | |
6415 | sr->msg_flags |= MSG_CMSG_COMPAT; | |
6416 | #endif | |
7ba89d2a | 6417 | sr->done_io = 0; |
93642ef8 | 6418 | return 0; |
aa1fa28f JA |
6419 | } |
6420 | ||
889fca73 | 6421 | static int io_recvmsg(struct io_kiocb *req, unsigned int issue_flags) |
aa1fa28f | 6422 | { |
6b754c8b | 6423 | struct io_async_msghdr iomsg, *kmsg; |
7ba89d2a | 6424 | struct io_sr_msg *sr = &req->sr_msg; |
03b1230c | 6425 | struct socket *sock; |
f548a12e | 6426 | unsigned int cflags; |
7a7cacba | 6427 | unsigned flags; |
d1fd1c20 | 6428 | int ret, min_ret = 0; |
45d189c6 | 6429 | bool force_nonblock = issue_flags & IO_URING_F_NONBLOCK; |
03b1230c | 6430 | |
dba4a925 | 6431 | sock = sock_from_file(req->file); |
7a7cacba | 6432 | if (unlikely(!sock)) |
dba4a925 | 6433 | return -ENOTSOCK; |
3529d8c2 | 6434 | |
d886e185 PB |
6435 | if (req_has_async_data(req)) { |
6436 | kmsg = req->async_data; | |
6437 | } else { | |
7a7cacba PB |
6438 | ret = io_recvmsg_copy_hdr(req, &iomsg); |
6439 | if (ret) | |
681fda8d | 6440 | return ret; |
7a7cacba PB |
6441 | kmsg = &iomsg; |
6442 | } | |
03b1230c | 6443 | |
0455d4cc JA |
6444 | if (!(req->flags & REQ_F_POLLED) && |
6445 | (sr->flags & IORING_RECVSEND_POLL_FIRST)) | |
6446 | return io_setup_async_msg(req, kmsg); | |
6447 | ||
b66e65f4 | 6448 | if (io_do_buffer_select(req)) { |
c54d52c2 JA |
6449 | void __user *buf; |
6450 | ||
4e906702 | 6451 | buf = io_buffer_select(req, &sr->len, issue_flags); |
984824db CH |
6452 | if (!buf) |
6453 | return -ENOBUFS; | |
c54d52c2 | 6454 | kmsg->fast_iov[0].iov_base = buf; |
0a352aaa JA |
6455 | kmsg->fast_iov[0].iov_len = sr->len; |
6456 | iov_iter_init(&kmsg->msg.msg_iter, READ, kmsg->fast_iov, 1, | |
6457 | sr->len); | |
7a7cacba | 6458 | } |
52de1fe1 | 6459 | |
0a352aaa | 6460 | flags = sr->msg_flags; |
04411806 | 6461 | if (force_nonblock) |
7a7cacba | 6462 | flags |= MSG_DONTWAIT; |
0031275d SM |
6463 | if (flags & MSG_WAITALL) |
6464 | min_ret = iov_iter_count(&kmsg->msg.msg_iter); | |
6465 | ||
f548a12e | 6466 | kmsg->msg.msg_get_inq = 1; |
0a352aaa | 6467 | ret = __sys_recvmsg_sock(sock, &kmsg->msg, sr->umsg, kmsg->uaddr, flags); |
7297ce3d PB |
6468 | if (ret < min_ret) { |
6469 | if (ret == -EAGAIN && force_nonblock) | |
6470 | return io_setup_async_msg(req, kmsg); | |
6471 | if (ret == -ERESTARTSYS) | |
6472 | ret = -EINTR; | |
7ba89d2a JA |
6473 | if (ret > 0 && io_net_retry(sock, flags)) { |
6474 | sr->done_io += ret; | |
8a3e8ee5 | 6475 | req->flags |= REQ_F_PARTIAL_IO; |
7ba89d2a JA |
6476 | return io_setup_async_msg(req, kmsg); |
6477 | } | |
7297ce3d PB |
6478 | req_set_fail(req); |
6479 | } else if ((flags & MSG_WAITALL) && (kmsg->msg.msg_flags & (MSG_TRUNC | MSG_CTRUNC))) { | |
6480 | req_set_fail(req); | |
6481 | } | |
03b1230c | 6482 | |
257e84a5 PB |
6483 | /* fast path, check for non-NULL to avoid function call */ |
6484 | if (kmsg->free_iov) | |
6485 | kfree(kmsg->free_iov); | |
99bc4c38 | 6486 | req->flags &= ~REQ_F_NEED_CLEANUP; |
7ba89d2a JA |
6487 | if (ret >= 0) |
6488 | ret += sr->done_io; | |
6489 | else if (sr->done_io) | |
6490 | ret = sr->done_io; | |
f548a12e JA |
6491 | cflags = io_put_kbuf(req, issue_flags); |
6492 | if (kmsg->msg.msg_inq) | |
6493 | cflags |= IORING_CQE_F_SOCK_NONEMPTY; | |
6494 | __io_req_complete(req, issue_flags, ret, cflags); | |
03b1230c | 6495 | return 0; |
0fa03c62 | 6496 | } |
5d17b4a4 | 6497 | |
889fca73 | 6498 | static int io_recv(struct io_kiocb *req, unsigned int issue_flags) |
fddaface | 6499 | { |
7a7cacba PB |
6500 | struct io_sr_msg *sr = &req->sr_msg; |
6501 | struct msghdr msg; | |
fddaface | 6502 | struct socket *sock; |
7a7cacba | 6503 | struct iovec iov; |
f548a12e | 6504 | unsigned int cflags; |
7a7cacba | 6505 | unsigned flags; |
d1fd1c20 | 6506 | int ret, min_ret = 0; |
45d189c6 | 6507 | bool force_nonblock = issue_flags & IO_URING_F_NONBLOCK; |
fddaface | 6508 | |
0455d4cc JA |
6509 | if (!(req->flags & REQ_F_POLLED) && |
6510 | (sr->flags & IORING_RECVSEND_POLL_FIRST)) | |
6511 | return -EAGAIN; | |
6512 | ||
dba4a925 | 6513 | sock = sock_from_file(req->file); |
7a7cacba | 6514 | if (unlikely(!sock)) |
dba4a925 | 6515 | return -ENOTSOCK; |
fddaface | 6516 | |
b66e65f4 | 6517 | if (io_do_buffer_select(req)) { |
c54d52c2 JA |
6518 | void __user *buf; |
6519 | ||
4e906702 | 6520 | buf = io_buffer_select(req, &sr->len, issue_flags); |
984824db CH |
6521 | if (!buf) |
6522 | return -ENOBUFS; | |
c54d52c2 | 6523 | sr->buf = buf; |
bc02ef33 | 6524 | } |
bcda7baa | 6525 | |
c54d52c2 | 6526 | ret = import_single_range(READ, sr->buf, sr->len, &iov, &msg.msg_iter); |
14c32eee PB |
6527 | if (unlikely(ret)) |
6528 | goto out_free; | |
fddaface | 6529 | |
7a7cacba | 6530 | msg.msg_name = NULL; |
f548a12e | 6531 | msg.msg_namelen = 0; |
7a7cacba | 6532 | msg.msg_control = NULL; |
f548a12e JA |
6533 | msg.msg_get_inq = 1; |
6534 | msg.msg_flags = 0; | |
7a7cacba | 6535 | msg.msg_controllen = 0; |
7a7cacba | 6536 | msg.msg_iocb = NULL; |
fddaface | 6537 | |
0a352aaa | 6538 | flags = sr->msg_flags; |
04411806 | 6539 | if (force_nonblock) |
7a7cacba | 6540 | flags |= MSG_DONTWAIT; |
0031275d SM |
6541 | if (flags & MSG_WAITALL) |
6542 | min_ret = iov_iter_count(&msg.msg_iter); | |
6543 | ||
7a7cacba | 6544 | ret = sock_recvmsg(sock, &msg, flags); |
7297ce3d PB |
6545 | if (ret < min_ret) { |
6546 | if (ret == -EAGAIN && force_nonblock) | |
6547 | return -EAGAIN; | |
6548 | if (ret == -ERESTARTSYS) | |
6549 | ret = -EINTR; | |
7ba89d2a JA |
6550 | if (ret > 0 && io_net_retry(sock, flags)) { |
6551 | sr->len -= ret; | |
6552 | sr->buf += ret; | |
6553 | sr->done_io += ret; | |
8a3e8ee5 | 6554 | req->flags |= REQ_F_PARTIAL_IO; |
7ba89d2a JA |
6555 | return -EAGAIN; |
6556 | } | |
7297ce3d PB |
6557 | req_set_fail(req); |
6558 | } else if ((flags & MSG_WAITALL) && (msg.msg_flags & (MSG_TRUNC | MSG_CTRUNC))) { | |
0d7c1153 | 6559 | out_free: |
93d2bcd2 | 6560 | req_set_fail(req); |
7297ce3d | 6561 | } |
cc3cec83 | 6562 | |
7ba89d2a JA |
6563 | if (ret >= 0) |
6564 | ret += sr->done_io; | |
6565 | else if (sr->done_io) | |
6566 | ret = sr->done_io; | |
f548a12e JA |
6567 | cflags = io_put_kbuf(req, issue_flags); |
6568 | if (msg.msg_inq) | |
6569 | cflags |= IORING_CQE_F_SOCK_NONEMPTY; | |
6570 | __io_req_complete(req, issue_flags, ret, cflags); | |
fddaface | 6571 | return 0; |
fddaface JA |
6572 | } |
6573 | ||
3529d8c2 | 6574 | static int io_accept_prep(struct io_kiocb *req, const struct io_uring_sqe *sqe) |
17f2fe35 | 6575 | { |
8ed8d3c3 | 6576 | struct io_accept *accept = &req->accept; |
4e86a2c9 | 6577 | unsigned flags; |
8ed8d3c3 | 6578 | |
73911426 | 6579 | if (sqe->len || sqe->buf_index) |
17f2fe35 JA |
6580 | return -EINVAL; |
6581 | ||
d55e5f5b JA |
6582 | accept->addr = u64_to_user_ptr(READ_ONCE(sqe->addr)); |
6583 | accept->addr_len = u64_to_user_ptr(READ_ONCE(sqe->addr2)); | |
8ed8d3c3 | 6584 | accept->flags = READ_ONCE(sqe->accept_flags); |
09952e3e | 6585 | accept->nofile = rlimit(RLIMIT_NOFILE); |
4e86a2c9 HX |
6586 | flags = READ_ONCE(sqe->ioprio); |
6587 | if (flags & ~IORING_ACCEPT_MULTISHOT) | |
6588 | return -EINVAL; | |
a7083ad5 | 6589 | |
aaa4db12 | 6590 | accept->file_slot = READ_ONCE(sqe->file_index); |
4e86a2c9 HX |
6591 | if (accept->file_slot) { |
6592 | if (accept->flags & SOCK_CLOEXEC) | |
6593 | return -EINVAL; | |
6594 | if (flags & IORING_ACCEPT_MULTISHOT && | |
6595 | accept->file_slot != IORING_FILE_INDEX_ALLOC) | |
6596 | return -EINVAL; | |
6597 | } | |
a7083ad5 PB |
6598 | if (accept->flags & ~(SOCK_CLOEXEC | SOCK_NONBLOCK)) |
6599 | return -EINVAL; | |
6600 | if (SOCK_NONBLOCK != O_NONBLOCK && (accept->flags & SOCK_NONBLOCK)) | |
6601 | accept->flags = (accept->flags & ~SOCK_NONBLOCK) | O_NONBLOCK; | |
4e86a2c9 HX |
6602 | if (flags & IORING_ACCEPT_MULTISHOT) |
6603 | req->flags |= REQ_F_APOLL_MULTISHOT; | |
8ed8d3c3 | 6604 | return 0; |
8ed8d3c3 | 6605 | } |
17f2fe35 | 6606 | |
889fca73 | 6607 | static int io_accept(struct io_kiocb *req, unsigned int issue_flags) |
8ed8d3c3 | 6608 | { |
4e86a2c9 | 6609 | struct io_ring_ctx *ctx = req->ctx; |
8ed8d3c3 | 6610 | struct io_accept *accept = &req->accept; |
45d189c6 | 6611 | bool force_nonblock = issue_flags & IO_URING_F_NONBLOCK; |
ac45abc0 | 6612 | unsigned int file_flags = force_nonblock ? O_NONBLOCK : 0; |
aaa4db12 | 6613 | bool fixed = !!accept->file_slot; |
a7083ad5 PB |
6614 | struct file *file; |
6615 | int ret, fd; | |
8ed8d3c3 | 6616 | |
4e86a2c9 | 6617 | retry: |
aaa4db12 PB |
6618 | if (!fixed) { |
6619 | fd = __get_unused_fd_flags(accept->flags, accept->nofile); | |
6620 | if (unlikely(fd < 0)) | |
6621 | return fd; | |
6622 | } | |
a7083ad5 PB |
6623 | file = do_accept(req->file, file_flags, accept->addr, accept->addr_len, |
6624 | accept->flags); | |
6625 | if (IS_ERR(file)) { | |
aaa4db12 PB |
6626 | if (!fixed) |
6627 | put_unused_fd(fd); | |
a7083ad5 | 6628 | ret = PTR_ERR(file); |
4e86a2c9 HX |
6629 | if (ret == -EAGAIN && force_nonblock) { |
6630 | /* | |
6631 | * if it's multishot and polled, we don't need to | |
6632 | * return EAGAIN to arm the poll infra since it | |
6633 | * has already been done | |
6634 | */ | |
6635 | if ((req->flags & IO_APOLL_MULTI_POLLED) == | |
6636 | IO_APOLL_MULTI_POLLED) | |
6637 | ret = 0; | |
6638 | return ret; | |
6639 | } | |
ac45abc0 PB |
6640 | if (ret == -ERESTARTSYS) |
6641 | ret = -EINTR; | |
93d2bcd2 | 6642 | req_set_fail(req); |
aaa4db12 | 6643 | } else if (!fixed) { |
a7083ad5 PB |
6644 | fd_install(fd, file); |
6645 | ret = fd; | |
aaa4db12 | 6646 | } else { |
c30c3e00 JA |
6647 | ret = io_fixed_fd_install(req, issue_flags, file, |
6648 | accept->file_slot); | |
ac45abc0 | 6649 | } |
4e86a2c9 HX |
6650 | |
6651 | if (!(req->flags & REQ_F_APOLL_MULTISHOT)) { | |
6652 | __io_req_complete(req, issue_flags, ret, 0); | |
6653 | return 0; | |
6654 | } | |
6655 | if (ret >= 0) { | |
6656 | bool filled; | |
6657 | ||
6658 | spin_lock(&ctx->completion_lock); | |
6659 | filled = io_fill_cqe_aux(ctx, req->cqe.user_data, ret, | |
6660 | IORING_CQE_F_MORE); | |
6661 | io_commit_cqring(ctx); | |
6662 | spin_unlock(&ctx->completion_lock); | |
6663 | if (filled) { | |
6664 | io_cqring_ev_posted(ctx); | |
6665 | goto retry; | |
6666 | } | |
6667 | ret = -ECANCELED; | |
6668 | } | |
6669 | ||
6670 | return ret; | |
8ed8d3c3 JA |
6671 | } |
6672 | ||
1374e08e JA |
6673 | static int io_socket_prep(struct io_kiocb *req, const struct io_uring_sqe *sqe) |
6674 | { | |
6675 | struct io_socket *sock = &req->sock; | |
6676 | ||
ee692a21 | 6677 | if (sqe->addr || sqe->rw_flags || sqe->buf_index) |
1374e08e JA |
6678 | return -EINVAL; |
6679 | ||
6680 | sock->domain = READ_ONCE(sqe->fd); | |
6681 | sock->type = READ_ONCE(sqe->off); | |
6682 | sock->protocol = READ_ONCE(sqe->len); | |
6683 | sock->file_slot = READ_ONCE(sqe->file_index); | |
6684 | sock->nofile = rlimit(RLIMIT_NOFILE); | |
6685 | ||
6686 | sock->flags = sock->type & ~SOCK_TYPE_MASK; | |
6687 | if (sock->file_slot && (sock->flags & SOCK_CLOEXEC)) | |
6688 | return -EINVAL; | |
6689 | if (sock->flags & ~(SOCK_CLOEXEC | SOCK_NONBLOCK)) | |
6690 | return -EINVAL; | |
6691 | return 0; | |
6692 | } | |
6693 | ||
6694 | static int io_socket(struct io_kiocb *req, unsigned int issue_flags) | |
6695 | { | |
6696 | struct io_socket *sock = &req->sock; | |
6697 | bool fixed = !!sock->file_slot; | |
6698 | struct file *file; | |
6699 | int ret, fd; | |
6700 | ||
6701 | if (!fixed) { | |
6702 | fd = __get_unused_fd_flags(sock->flags, sock->nofile); | |
6703 | if (unlikely(fd < 0)) | |
6704 | return fd; | |
6705 | } | |
6706 | file = __sys_socket_file(sock->domain, sock->type, sock->protocol); | |
6707 | if (IS_ERR(file)) { | |
6708 | if (!fixed) | |
6709 | put_unused_fd(fd); | |
6710 | ret = PTR_ERR(file); | |
6711 | if (ret == -EAGAIN && (issue_flags & IO_URING_F_NONBLOCK)) | |
6712 | return -EAGAIN; | |
6713 | if (ret == -ERESTARTSYS) | |
6714 | ret = -EINTR; | |
6715 | req_set_fail(req); | |
6716 | } else if (!fixed) { | |
6717 | fd_install(fd, file); | |
6718 | ret = fd; | |
6719 | } else { | |
fa82dd10 JA |
6720 | ret = io_fixed_fd_install(req, issue_flags, file, |
6721 | sock->file_slot); | |
1374e08e JA |
6722 | } |
6723 | __io_req_complete(req, issue_flags, ret, 0); | |
6724 | return 0; | |
6725 | } | |
6726 | ||
93642ef8 PB |
6727 | static int io_connect_prep_async(struct io_kiocb *req) |
6728 | { | |
6729 | struct io_async_connect *io = req->async_data; | |
6730 | struct io_connect *conn = &req->connect; | |
6731 | ||
6732 | return move_addr_to_kernel(conn->addr, conn->addr_len, &io->address); | |
6733 | } | |
6734 | ||
3529d8c2 | 6735 | static int io_connect_prep(struct io_kiocb *req, const struct io_uring_sqe *sqe) |
f499a021 | 6736 | { |
3529d8c2 | 6737 | struct io_connect *conn = &req->connect; |
f499a021 | 6738 | |
73911426 | 6739 | if (sqe->len || sqe->buf_index || sqe->rw_flags || sqe->splice_fd_in) |
3fbb51c1 JA |
6740 | return -EINVAL; |
6741 | ||
3529d8c2 JA |
6742 | conn->addr = u64_to_user_ptr(READ_ONCE(sqe->addr)); |
6743 | conn->addr_len = READ_ONCE(sqe->addr2); | |
93642ef8 | 6744 | return 0; |
f499a021 JA |
6745 | } |
6746 | ||
889fca73 | 6747 | static int io_connect(struct io_kiocb *req, unsigned int issue_flags) |
f8e85cf2 | 6748 | { |
e8c2bc1f | 6749 | struct io_async_connect __io, *io; |
f8e85cf2 | 6750 | unsigned file_flags; |
3fbb51c1 | 6751 | int ret; |
45d189c6 | 6752 | bool force_nonblock = issue_flags & IO_URING_F_NONBLOCK; |
f8e85cf2 | 6753 | |
d886e185 | 6754 | if (req_has_async_data(req)) { |
e8c2bc1f | 6755 | io = req->async_data; |
f499a021 | 6756 | } else { |
3529d8c2 JA |
6757 | ret = move_addr_to_kernel(req->connect.addr, |
6758 | req->connect.addr_len, | |
e8c2bc1f | 6759 | &__io.address); |
f499a021 JA |
6760 | if (ret) |
6761 | goto out; | |
6762 | io = &__io; | |
6763 | } | |
6764 | ||
3fbb51c1 JA |
6765 | file_flags = force_nonblock ? O_NONBLOCK : 0; |
6766 | ||
e8c2bc1f | 6767 | ret = __sys_connect_file(req->file, &io->address, |
3fbb51c1 | 6768 | req->connect.addr_len, file_flags); |
87f80d62 | 6769 | if ((ret == -EAGAIN || ret == -EINPROGRESS) && force_nonblock) { |
d886e185 | 6770 | if (req_has_async_data(req)) |
b7bb4f7d | 6771 | return -EAGAIN; |
e8c2bc1f | 6772 | if (io_alloc_async_data(req)) { |
f499a021 JA |
6773 | ret = -ENOMEM; |
6774 | goto out; | |
6775 | } | |
e8c2bc1f | 6776 | memcpy(req->async_data, &__io, sizeof(__io)); |
f8e85cf2 | 6777 | return -EAGAIN; |
f499a021 | 6778 | } |
f8e85cf2 JA |
6779 | if (ret == -ERESTARTSYS) |
6780 | ret = -EINTR; | |
f499a021 | 6781 | out: |
4e88d6e7 | 6782 | if (ret < 0) |
93d2bcd2 | 6783 | req_set_fail(req); |
889fca73 | 6784 | __io_req_complete(req, issue_flags, ret, 0); |
f8e85cf2 | 6785 | return 0; |
469956e8 Y |
6786 | } |
6787 | #else /* !CONFIG_NET */ | |
99a10081 JA |
6788 | #define IO_NETOP_FN(op) \ |
6789 | static int io_##op(struct io_kiocb *req, unsigned int issue_flags) \ | |
6790 | { \ | |
6791 | return -EOPNOTSUPP; \ | |
6792 | } | |
6793 | ||
6794 | #define IO_NETOP_PREP(op) \ | |
6795 | IO_NETOP_FN(op) \ | |
6796 | static int io_##op##_prep(struct io_kiocb *req, const struct io_uring_sqe *sqe) \ | |
6797 | { \ | |
6798 | return -EOPNOTSUPP; \ | |
6799 | } \ | |
6800 | ||
6801 | #define IO_NETOP_PREP_ASYNC(op) \ | |
6802 | IO_NETOP_PREP(op) \ | |
6803 | static int io_##op##_prep_async(struct io_kiocb *req) \ | |
6804 | { \ | |
6805 | return -EOPNOTSUPP; \ | |
6806 | } | |
6807 | ||
6808 | IO_NETOP_PREP_ASYNC(sendmsg); | |
6809 | IO_NETOP_PREP_ASYNC(recvmsg); | |
6810 | IO_NETOP_PREP_ASYNC(connect); | |
6811 | IO_NETOP_PREP(accept); | |
1374e08e | 6812 | IO_NETOP_PREP(socket); |
1151a7cc | 6813 | IO_NETOP_PREP(shutdown); |
99a10081 JA |
6814 | IO_NETOP_FN(send); |
6815 | IO_NETOP_FN(recv); | |
469956e8 | 6816 | #endif /* CONFIG_NET */ |
f8e85cf2 | 6817 | |
d7718a9d JA |
6818 | struct io_poll_table { |
6819 | struct poll_table_struct pt; | |
6820 | struct io_kiocb *req; | |
68b11e8b | 6821 | int nr_entries; |
d7718a9d JA |
6822 | int error; |
6823 | }; | |
ce593a6c | 6824 | |
aa43477b | 6825 | #define IO_POLL_CANCEL_FLAG BIT(31) |
e2c0cb7c | 6826 | #define IO_POLL_REF_MASK GENMASK(30, 0) |
6d816e08 | 6827 | |
aa43477b PB |
6828 | /* |
6829 | * If refs part of ->poll_refs (see IO_POLL_REF_MASK) is 0, it's free. We can | |
6830 | * bump it and acquire ownership. It's disallowed to modify requests while not | |
6831 | * owning it, that prevents from races for enqueueing task_work's and b/w | |
6832 | * arming poll and wakeups. | |
6833 | */ | |
6834 | static inline bool io_poll_get_ownership(struct io_kiocb *req) | |
6835 | { | |
6836 | return !(atomic_fetch_inc(&req->poll_refs) & IO_POLL_REF_MASK); | |
d7718a9d JA |
6837 | } |
6838 | ||
aa43477b | 6839 | static void io_poll_mark_cancelled(struct io_kiocb *req) |
74ce6ce4 | 6840 | { |
aa43477b | 6841 | atomic_or(IO_POLL_CANCEL_FLAG, &req->poll_refs); |
74ce6ce4 JA |
6842 | } |
6843 | ||
d4e7cd36 | 6844 | static struct io_poll_iocb *io_poll_get_double(struct io_kiocb *req) |
18bceab1 | 6845 | { |
e8c2bc1f | 6846 | /* pure poll stashes this in ->async_data, poll driven retry elsewhere */ |
d4e7cd36 | 6847 | if (req->opcode == IORING_OP_POLL_ADD) |
e8c2bc1f | 6848 | return req->async_data; |
d4e7cd36 JA |
6849 | return req->apoll->double_poll; |
6850 | } | |
6851 | ||
6852 | static struct io_poll_iocb *io_poll_get_single(struct io_kiocb *req) | |
6853 | { | |
6854 | if (req->opcode == IORING_OP_POLL_ADD) | |
6855 | return &req->poll; | |
6856 | return &req->apoll->poll; | |
6857 | } | |
6858 | ||
5641897a | 6859 | static void io_poll_req_insert(struct io_kiocb *req) |
d4e7cd36 | 6860 | { |
5641897a PB |
6861 | struct io_ring_ctx *ctx = req->ctx; |
6862 | struct hlist_head *list; | |
18bceab1 | 6863 | |
cef216fc | 6864 | list = &ctx->cancel_hash[hash_long(req->cqe.user_data, ctx->cancel_hash_bits)]; |
5641897a | 6865 | hlist_add_head(&req->hash_node, list); |
18bceab1 JA |
6866 | } |
6867 | ||
5641897a PB |
6868 | static void io_init_poll_iocb(struct io_poll_iocb *poll, __poll_t events, |
6869 | wait_queue_func_t wake_func) | |
18bceab1 | 6870 | { |
5641897a | 6871 | poll->head = NULL; |
5641897a PB |
6872 | #define IO_POLL_UNMASK (EPOLLERR|EPOLLHUP|EPOLLNVAL|EPOLLRDHUP) |
6873 | /* mask in events that we always want/need */ | |
6874 | poll->events = events | IO_POLL_UNMASK; | |
6875 | INIT_LIST_HEAD(&poll->wait.entry); | |
6876 | init_waitqueue_func_entry(&poll->wait, wake_func); | |
18bceab1 JA |
6877 | } |
6878 | ||
aa43477b | 6879 | static inline void io_poll_remove_entry(struct io_poll_iocb *poll) |
18bceab1 | 6880 | { |
791f3465 | 6881 | struct wait_queue_head *head = smp_load_acquire(&poll->head); |
18bceab1 | 6882 | |
791f3465 PB |
6883 | if (head) { |
6884 | spin_lock_irq(&head->lock); | |
6885 | list_del_init(&poll->wait.entry); | |
6886 | poll->head = NULL; | |
6887 | spin_unlock_irq(&head->lock); | |
6888 | } | |
aa43477b | 6889 | } |
18bceab1 | 6890 | |
aa43477b PB |
6891 | static void io_poll_remove_entries(struct io_kiocb *req) |
6892 | { | |
91eac1c6 JA |
6893 | /* |
6894 | * Nothing to do if neither of those flags are set. Avoid dipping | |
6895 | * into the poll/apoll/double cachelines if we can. | |
6896 | */ | |
6897 | if (!(req->flags & (REQ_F_SINGLE_POLL | REQ_F_DOUBLE_POLL))) | |
6898 | return; | |
18bceab1 | 6899 | |
791f3465 PB |
6900 | /* |
6901 | * While we hold the waitqueue lock and the waitqueue is nonempty, | |
6902 | * wake_up_pollfree() will wait for us. However, taking the waitqueue | |
6903 | * lock in the first place can race with the waitqueue being freed. | |
6904 | * | |
6905 | * We solve this as eventpoll does: by taking advantage of the fact that | |
6906 | * all users of wake_up_pollfree() will RCU-delay the actual free. If | |
6907 | * we enter rcu_read_lock() and see that the pointer to the queue is | |
6908 | * non-NULL, we can then lock it without the memory being freed out from | |
6909 | * under us. | |
6910 | * | |
6911 | * Keep holding rcu_read_lock() as long as we hold the queue lock, in | |
6912 | * case the caller deletes the entry from the queue, leaving it empty. | |
6913 | * In that case, only RCU prevents the queue memory from being freed. | |
6914 | */ | |
6915 | rcu_read_lock(); | |
91eac1c6 JA |
6916 | if (req->flags & REQ_F_SINGLE_POLL) |
6917 | io_poll_remove_entry(io_poll_get_single(req)); | |
6918 | if (req->flags & REQ_F_DOUBLE_POLL) | |
6919 | io_poll_remove_entry(io_poll_get_double(req)); | |
791f3465 | 6920 | rcu_read_unlock(); |
18bceab1 JA |
6921 | } |
6922 | ||
dbc2564c | 6923 | static int io_issue_sqe(struct io_kiocb *req, unsigned int issue_flags); |
aa43477b PB |
6924 | /* |
6925 | * All poll tw should go through this. Checks for poll events, manages | |
6926 | * references, does rewait, etc. | |
6927 | * | |
6928 | * Returns a negative error on failure. >0 when no action require, which is | |
6929 | * either spurious wakeup or multishot CQE is served. 0 when it's done with | |
cef216fc | 6930 | * the request, then the mask is stored in req->cqe.res. |
aa43477b | 6931 | */ |
dbc2564c | 6932 | static int io_poll_check_events(struct io_kiocb *req, bool *locked) |
18bceab1 | 6933 | { |
74ce6ce4 | 6934 | struct io_ring_ctx *ctx = req->ctx; |
dbc2564c | 6935 | int v, ret; |
18bceab1 | 6936 | |
316319e8 | 6937 | /* req->task == current here, checking PF_EXITING is safe */ |
e09ee510 | 6938 | if (unlikely(req->task->flags & PF_EXITING)) |
f2219057 | 6939 | return -ECANCELED; |
18bceab1 | 6940 | |
aa43477b PB |
6941 | do { |
6942 | v = atomic_read(&req->poll_refs); | |
74ce6ce4 | 6943 | |
aa43477b PB |
6944 | /* tw handler should be the owner, and so have some references */ |
6945 | if (WARN_ON_ONCE(!(v & IO_POLL_REF_MASK))) | |
6946 | return 0; | |
6947 | if (v & IO_POLL_CANCEL_FLAG) | |
6948 | return -ECANCELED; | |
8706e04e | 6949 | |
cef216fc | 6950 | if (!req->cqe.res) { |
2804ecd8 | 6951 | struct poll_table_struct pt = { ._key = req->apoll_events }; |
cef216fc | 6952 | req->cqe.res = vfs_poll(req->file, &pt) & req->apoll_events; |
c8b5e260 | 6953 | } |
74ce6ce4 | 6954 | |
dbc2564c HX |
6955 | if ((unlikely(!req->cqe.res))) |
6956 | continue; | |
6957 | if (req->apoll_events & EPOLLONESHOT) | |
6958 | return 0; | |
6959 | ||
6960 | /* multishot, just fill a CQE and proceed */ | |
6961 | if (!(req->flags & REQ_F_APOLL_MULTISHOT)) { | |
6962 | __poll_t mask = mangle_poll(req->cqe.res & | |
6963 | req->apoll_events); | |
aa43477b | 6964 | bool filled; |
18bceab1 | 6965 | |
aa43477b | 6966 | spin_lock(&ctx->completion_lock); |
dbc2564c HX |
6967 | filled = io_fill_cqe_aux(ctx, req->cqe.user_data, |
6968 | mask, IORING_CQE_F_MORE); | |
aa43477b PB |
6969 | io_commit_cqring(ctx); |
6970 | spin_unlock(&ctx->completion_lock); | |
dbc2564c HX |
6971 | if (filled) { |
6972 | io_cqring_ev_posted(ctx); | |
6973 | continue; | |
6974 | } | |
6975 | return -ECANCELED; | |
aa43477b | 6976 | } |
18bceab1 | 6977 | |
dbc2564c HX |
6978 | io_tw_lock(req->ctx, locked); |
6979 | if (unlikely(req->task->flags & PF_EXITING)) | |
6980 | return -EFAULT; | |
6981 | ret = io_issue_sqe(req, | |
6982 | IO_URING_F_NONBLOCK|IO_URING_F_COMPLETE_DEFER); | |
6983 | if (ret) | |
6984 | return ret; | |
6985 | ||
aa43477b PB |
6986 | /* |
6987 | * Release all references, retry if someone tried to restart | |
6988 | * task_work while we were executing it. | |
6989 | */ | |
6990 | } while (atomic_sub_return(v & IO_POLL_REF_MASK, &req->poll_refs)); | |
18bceab1 | 6991 | |
18bceab1 JA |
6992 | return 1; |
6993 | } | |
6994 | ||
aa43477b | 6995 | static void io_poll_task_func(struct io_kiocb *req, bool *locked) |
18bceab1 | 6996 | { |
18bceab1 | 6997 | struct io_ring_ctx *ctx = req->ctx; |
aa43477b | 6998 | int ret; |
18bceab1 | 6999 | |
dbc2564c | 7000 | ret = io_poll_check_events(req, locked); |
aa43477b PB |
7001 | if (ret > 0) |
7002 | return; | |
7003 | ||
7004 | if (!ret) { | |
cef216fc | 7005 | req->cqe.res = mangle_poll(req->cqe.res & req->poll.events); |
e27414be | 7006 | } else { |
cef216fc | 7007 | req->cqe.res = ret; |
aa43477b | 7008 | req_set_fail(req); |
a62682f9 | 7009 | } |
aa43477b PB |
7010 | |
7011 | io_poll_remove_entries(req); | |
7012 | spin_lock(&ctx->completion_lock); | |
7013 | hash_del(&req->hash_node); | |
cef216fc | 7014 | __io_req_complete_post(req, req->cqe.res, 0); |
aa43477b PB |
7015 | io_commit_cqring(ctx); |
7016 | spin_unlock(&ctx->completion_lock); | |
7017 | io_cqring_ev_posted(ctx); | |
18bceab1 JA |
7018 | } |
7019 | ||
aa43477b | 7020 | static void io_apoll_task_func(struct io_kiocb *req, bool *locked) |
18bceab1 JA |
7021 | { |
7022 | struct io_ring_ctx *ctx = req->ctx; | |
aa43477b | 7023 | int ret; |
18bceab1 | 7024 | |
dbc2564c | 7025 | ret = io_poll_check_events(req, locked); |
aa43477b PB |
7026 | if (ret > 0) |
7027 | return; | |
18bceab1 | 7028 | |
aa43477b PB |
7029 | io_poll_remove_entries(req); |
7030 | spin_lock(&ctx->completion_lock); | |
7031 | hash_del(&req->hash_node); | |
7032 | spin_unlock(&ctx->completion_lock); | |
18bceab1 | 7033 | |
aa43477b PB |
7034 | if (!ret) |
7035 | io_req_task_submit(req, locked); | |
7036 | else | |
7037 | io_req_complete_failed(req, ret); | |
18bceab1 JA |
7038 | } |
7039 | ||
58f5c8d3 | 7040 | static void __io_poll_execute(struct io_kiocb *req, int mask, __poll_t events) |
aa43477b | 7041 | { |
cef216fc | 7042 | req->cqe.res = mask; |
81459350 JA |
7043 | /* |
7044 | * This is useful for poll that is armed on behalf of another | |
7045 | * request, and where the wakeup path could be on a different | |
7046 | * CPU. We want to avoid pulling in req->apoll->events for that | |
7047 | * case. | |
7048 | */ | |
2804ecd8 | 7049 | req->apoll_events = events; |
aa43477b PB |
7050 | if (req->opcode == IORING_OP_POLL_ADD) |
7051 | req->io_task_work.func = io_poll_task_func; | |
7052 | else | |
7053 | req->io_task_work.func = io_apoll_task_func; | |
7054 | ||
cef216fc | 7055 | trace_io_uring_task_add(req->ctx, req, req->cqe.user_data, req->opcode, mask); |
3fe07bcd | 7056 | io_req_task_work_add(req); |
aa43477b PB |
7057 | } |
7058 | ||
58f5c8d3 CH |
7059 | static inline void io_poll_execute(struct io_kiocb *req, int res, |
7060 | __poll_t events) | |
aa43477b PB |
7061 | { |
7062 | if (io_poll_get_ownership(req)) | |
81459350 | 7063 | __io_poll_execute(req, res, events); |
aa43477b PB |
7064 | } |
7065 | ||
7066 | static void io_poll_cancel_req(struct io_kiocb *req) | |
7067 | { | |
7068 | io_poll_mark_cancelled(req); | |
7069 | /* kick tw, which should complete the request */ | |
81459350 | 7070 | io_poll_execute(req, 0, 0); |
aa43477b PB |
7071 | } |
7072 | ||
d89a4fac JA |
7073 | #define wqe_to_req(wait) ((void *)((unsigned long) (wait)->private & ~1)) |
7074 | #define wqe_is_double(wait) ((unsigned long) (wait)->private & 1) | |
a294bef5 | 7075 | #define IO_ASYNC_POLL_COMMON (EPOLLONESHOT | EPOLLPRI) |
d89a4fac | 7076 | |
aa43477b PB |
7077 | static int io_poll_wake(struct wait_queue_entry *wait, unsigned mode, int sync, |
7078 | void *key) | |
18bceab1 | 7079 | { |
d89a4fac | 7080 | struct io_kiocb *req = wqe_to_req(wait); |
aa43477b PB |
7081 | struct io_poll_iocb *poll = container_of(wait, struct io_poll_iocb, |
7082 | wait); | |
18bceab1 JA |
7083 | __poll_t mask = key_to_poll(key); |
7084 | ||
791f3465 PB |
7085 | if (unlikely(mask & POLLFREE)) { |
7086 | io_poll_mark_cancelled(req); | |
7087 | /* we have to kick tw in case it's not already */ | |
81459350 | 7088 | io_poll_execute(req, 0, poll->events); |
791f3465 PB |
7089 | |
7090 | /* | |
7091 | * If the waitqueue is being freed early but someone is already | |
7092 | * holds ownership over it, we have to tear down the request as | |
7093 | * best we can. That means immediately removing the request from | |
7094 | * its waitqueue and preventing all further accesses to the | |
7095 | * waitqueue via the request. | |
7096 | */ | |
7097 | list_del_init(&poll->wait.entry); | |
7098 | ||
7099 | /* | |
7100 | * Careful: this *must* be the last step, since as soon | |
7101 | * as req->head is NULL'ed out, the request can be | |
7102 | * completed and freed, since aio_poll_complete_work() | |
7103 | * will no longer need to take the waitqueue lock. | |
7104 | */ | |
7105 | smp_store_release(&poll->head, NULL); | |
7106 | return 1; | |
7107 | } | |
7108 | ||
aa43477b | 7109 | /* for instances that support it check for an event match first */ |
1b1d7b4b | 7110 | if (mask && !(mask & (poll->events & ~IO_ASYNC_POLL_COMMON))) |
18bceab1 JA |
7111 | return 0; |
7112 | ||
eb0089d6 PB |
7113 | if (io_poll_get_ownership(req)) { |
7114 | /* optional, saves extra locking for removal in tw handler */ | |
7115 | if (mask && poll->events & EPOLLONESHOT) { | |
7116 | list_del_init(&poll->wait.entry); | |
7117 | poll->head = NULL; | |
d89a4fac JA |
7118 | if (wqe_is_double(wait)) |
7119 | req->flags &= ~REQ_F_DOUBLE_POLL; | |
7120 | else | |
7121 | req->flags &= ~REQ_F_SINGLE_POLL; | |
eb0089d6 | 7122 | } |
81459350 | 7123 | __io_poll_execute(req, mask, poll->events); |
eb0089d6 | 7124 | } |
18bceab1 | 7125 | return 1; |
18bceab1 JA |
7126 | } |
7127 | ||
7128 | static void __io_queue_proc(struct io_poll_iocb *poll, struct io_poll_table *pt, | |
807abcb0 JA |
7129 | struct wait_queue_head *head, |
7130 | struct io_poll_iocb **poll_ptr) | |
18bceab1 JA |
7131 | { |
7132 | struct io_kiocb *req = pt->req; | |
d89a4fac | 7133 | unsigned long wqe_private = (unsigned long) req; |
18bceab1 JA |
7134 | |
7135 | /* | |
68b11e8b PB |
7136 | * The file being polled uses multiple waitqueues for poll handling |
7137 | * (e.g. one for read, one for write). Setup a separate io_poll_iocb | |
7138 | * if this happens. | |
18bceab1 | 7139 | */ |
68b11e8b | 7140 | if (unlikely(pt->nr_entries)) { |
aa43477b | 7141 | struct io_poll_iocb *first = poll; |
58852d4d | 7142 | |
23a65db8 | 7143 | /* double add on the same waitqueue head, ignore */ |
aa43477b | 7144 | if (first->head == head) |
23a65db8 | 7145 | return; |
18bceab1 | 7146 | /* already have a 2nd entry, fail a third attempt */ |
807abcb0 | 7147 | if (*poll_ptr) { |
23a65db8 PB |
7148 | if ((*poll_ptr)->head == head) |
7149 | return; | |
18bceab1 JA |
7150 | pt->error = -EINVAL; |
7151 | return; | |
7152 | } | |
aa43477b | 7153 | |
18bceab1 JA |
7154 | poll = kmalloc(sizeof(*poll), GFP_ATOMIC); |
7155 | if (!poll) { | |
7156 | pt->error = -ENOMEM; | |
7157 | return; | |
7158 | } | |
d89a4fac JA |
7159 | /* mark as double wq entry */ |
7160 | wqe_private |= 1; | |
91eac1c6 | 7161 | req->flags |= REQ_F_DOUBLE_POLL; |
aa43477b | 7162 | io_init_poll_iocb(poll, first->events, first->wait.func); |
807abcb0 | 7163 | *poll_ptr = poll; |
d886e185 PB |
7164 | if (req->opcode == IORING_OP_POLL_ADD) |
7165 | req->flags |= REQ_F_ASYNC_DATA; | |
18bceab1 JA |
7166 | } |
7167 | ||
91eac1c6 | 7168 | req->flags |= REQ_F_SINGLE_POLL; |
68b11e8b | 7169 | pt->nr_entries++; |
18bceab1 | 7170 | poll->head = head; |
d89a4fac | 7171 | poll->wait.private = (void *) wqe_private; |
a31eb4a2 JX |
7172 | |
7173 | if (poll->events & EPOLLEXCLUSIVE) | |
7174 | add_wait_queue_exclusive(head, &poll->wait); | |
7175 | else | |
7176 | add_wait_queue(head, &poll->wait); | |
18bceab1 JA |
7177 | } |
7178 | ||
aa43477b | 7179 | static void io_poll_queue_proc(struct file *file, struct wait_queue_head *head, |
18bceab1 JA |
7180 | struct poll_table_struct *p) |
7181 | { | |
7182 | struct io_poll_table *pt = container_of(p, struct io_poll_table, pt); | |
d7718a9d | 7183 | |
aa43477b PB |
7184 | __io_queue_proc(&pt->req->poll, pt, head, |
7185 | (struct io_poll_iocb **) &pt->req->async_data); | |
d7718a9d JA |
7186 | } |
7187 | ||
aa43477b PB |
7188 | static int __io_arm_poll_handler(struct io_kiocb *req, |
7189 | struct io_poll_iocb *poll, | |
7190 | struct io_poll_table *ipt, __poll_t mask) | |
d7718a9d JA |
7191 | { |
7192 | struct io_ring_ctx *ctx = req->ctx; | |
aa43477b | 7193 | int v; |
d7718a9d | 7194 | |
4d52f338 | 7195 | INIT_HLIST_NODE(&req->hash_node); |
8e29da69 | 7196 | req->work.cancel_seq = atomic_read(&ctx->cancel_seq); |
aa43477b | 7197 | io_init_poll_iocb(poll, mask, io_poll_wake); |
b90cd197 | 7198 | poll->file = req->file; |
d7718a9d JA |
7199 | |
7200 | ipt->pt._key = mask; | |
7201 | ipt->req = req; | |
68b11e8b PB |
7202 | ipt->error = 0; |
7203 | ipt->nr_entries = 0; | |
d7718a9d | 7204 | |
aa43477b PB |
7205 | /* |
7206 | * Take the ownership to delay any tw execution up until we're done | |
7207 | * with poll arming. see io_poll_get_ownership(). | |
7208 | */ | |
7209 | atomic_set(&req->poll_refs, 1); | |
d7718a9d | 7210 | mask = vfs_poll(req->file, &ipt->pt) & poll->events; |
aa43477b PB |
7211 | |
7212 | if (mask && (poll->events & EPOLLONESHOT)) { | |
7213 | io_poll_remove_entries(req); | |
7214 | /* no one else has access to the req, forget about the ref */ | |
7215 | return mask; | |
7216 | } | |
7217 | if (!mask && unlikely(ipt->error || !ipt->nr_entries)) { | |
7218 | io_poll_remove_entries(req); | |
7219 | if (!ipt->error) | |
7220 | ipt->error = -EINVAL; | |
7221 | return 0; | |
7222 | } | |
d7718a9d | 7223 | |
79ebeaee | 7224 | spin_lock(&ctx->completion_lock); |
aa43477b PB |
7225 | io_poll_req_insert(req); |
7226 | spin_unlock(&ctx->completion_lock); | |
7227 | ||
7228 | if (mask) { | |
7229 | /* can't multishot if failed, just queue the event we've got */ | |
7230 | if (unlikely(ipt->error || !ipt->nr_entries)) | |
7231 | poll->events |= EPOLLONESHOT; | |
81459350 | 7232 | __io_poll_execute(req, mask, poll->events); |
aa43477b | 7233 | return 0; |
d7718a9d JA |
7234 | } |
7235 | ||
aa43477b PB |
7236 | /* |
7237 | * Release ownership. If someone tried to queue a tw while it was | |
7238 | * locked, kick it off for them. | |
7239 | */ | |
7240 | v = atomic_dec_return(&req->poll_refs); | |
7241 | if (unlikely(v & IO_POLL_REF_MASK)) | |
81459350 | 7242 | __io_poll_execute(req, 0, poll->events); |
aa43477b PB |
7243 | return 0; |
7244 | } | |
7245 | ||
7246 | static void io_async_queue_proc(struct file *file, struct wait_queue_head *head, | |
7247 | struct poll_table_struct *p) | |
7248 | { | |
7249 | struct io_poll_table *pt = container_of(p, struct io_poll_table, pt); | |
7250 | struct async_poll *apoll = pt->req->apoll; | |
7251 | ||
7252 | __io_queue_proc(&apoll->poll, pt, head, &apoll->double_poll); | |
d7718a9d JA |
7253 | } |
7254 | ||
59b735ae OL |
7255 | enum { |
7256 | IO_APOLL_OK, | |
7257 | IO_APOLL_ABORTED, | |
7258 | IO_APOLL_READY | |
7259 | }; | |
7260 | ||
4d9237e3 | 7261 | static int io_arm_poll_handler(struct io_kiocb *req, unsigned issue_flags) |
d7718a9d JA |
7262 | { |
7263 | const struct io_op_def *def = &io_op_defs[req->opcode]; | |
7264 | struct io_ring_ctx *ctx = req->ctx; | |
7265 | struct async_poll *apoll; | |
7266 | struct io_poll_table ipt; | |
dbc2564c | 7267 | __poll_t mask = POLLPRI | POLLERR; |
aa43477b | 7268 | int ret; |
d7718a9d | 7269 | |
b2d9c3da PB |
7270 | if (!def->pollin && !def->pollout) |
7271 | return IO_APOLL_ABORTED; | |
10c87333 | 7272 | if (!file_can_poll(req->file)) |
658d0a40 | 7273 | return IO_APOLL_ABORTED; |
10c87333 | 7274 | if ((req->flags & (REQ_F_POLLED|REQ_F_PARTIAL_IO)) == REQ_F_POLLED) |
658d0a40 | 7275 | return IO_APOLL_ABORTED; |
dbc2564c HX |
7276 | if (!(req->flags & REQ_F_APOLL_MULTISHOT)) |
7277 | mask |= EPOLLONESHOT; | |
b2d9c3da PB |
7278 | |
7279 | if (def->pollin) { | |
a294bef5 | 7280 | mask |= EPOLLIN | EPOLLRDNORM; |
b2d9c3da PB |
7281 | |
7282 | /* If reading from MSG_ERRQUEUE using recvmsg, ignore POLLIN */ | |
7283 | if ((req->opcode == IORING_OP_RECVMSG) && | |
7284 | (req->sr_msg.msg_flags & MSG_ERRQUEUE)) | |
a294bef5 | 7285 | mask &= ~EPOLLIN; |
b2d9c3da | 7286 | } else { |
a294bef5 | 7287 | mask |= EPOLLOUT | EPOLLWRNORM; |
b2d9c3da | 7288 | } |
52dd8640 DY |
7289 | if (def->poll_exclusive) |
7290 | mask |= EPOLLEXCLUSIVE; | |
10c87333 JA |
7291 | if (req->flags & REQ_F_POLLED) { |
7292 | apoll = req->apoll; | |
7293 | } else if (!(issue_flags & IO_URING_F_UNLOCKED) && | |
7294 | !list_empty(&ctx->apoll_cache)) { | |
4d9237e3 JA |
7295 | apoll = list_first_entry(&ctx->apoll_cache, struct async_poll, |
7296 | poll.wait.entry); | |
7297 | list_del_init(&apoll->poll.wait.entry); | |
7298 | } else { | |
7299 | apoll = kmalloc(sizeof(*apoll), GFP_ATOMIC); | |
7300 | if (unlikely(!apoll)) | |
7301 | return IO_APOLL_ABORTED; | |
7302 | } | |
807abcb0 | 7303 | apoll->double_poll = NULL; |
d7718a9d | 7304 | req->apoll = apoll; |
b2d9c3da | 7305 | req->flags |= REQ_F_POLLED; |
d7718a9d JA |
7306 | ipt.pt._qproc = io_async_queue_proc; |
7307 | ||
4d55f238 | 7308 | io_kbuf_recycle(req, issue_flags); |
abdad709 | 7309 | |
aa43477b | 7310 | ret = __io_arm_poll_handler(req, &apoll->poll, &ipt, mask); |
41a5169c HX |
7311 | if (ret || ipt.error) |
7312 | return ret ? IO_APOLL_READY : IO_APOLL_ABORTED; | |
7313 | ||
cef216fc | 7314 | trace_io_uring_poll_arm(ctx, req, req->cqe.user_data, req->opcode, |
236daeae | 7315 | mask, apoll->poll.events); |
59b735ae | 7316 | return IO_APOLL_OK; |
d7718a9d JA |
7317 | } |
7318 | ||
76e1b642 JA |
7319 | /* |
7320 | * Returns true if we found and killed one or more poll requests | |
7321 | */ | |
c072481d PB |
7322 | static __cold bool io_poll_remove_all(struct io_ring_ctx *ctx, |
7323 | struct task_struct *tsk, bool cancel_all) | |
221c5eb2 | 7324 | { |
78076bb6 | 7325 | struct hlist_node *tmp; |
221c5eb2 | 7326 | struct io_kiocb *req; |
aa43477b PB |
7327 | bool found = false; |
7328 | int i; | |
221c5eb2 | 7329 | |
79ebeaee | 7330 | spin_lock(&ctx->completion_lock); |
78076bb6 JA |
7331 | for (i = 0; i < (1U << ctx->cancel_hash_bits); i++) { |
7332 | struct hlist_head *list; | |
7333 | ||
7334 | list = &ctx->cancel_hash[i]; | |
f3606e3a | 7335 | hlist_for_each_entry_safe(req, tmp, list, hash_node) { |
42a7b4ed | 7336 | if (io_match_task_safe(req, tsk, cancel_all)) { |
61bc84c4 | 7337 | hlist_del_init(&req->hash_node); |
aa43477b PB |
7338 | io_poll_cancel_req(req); |
7339 | found = true; | |
7340 | } | |
f3606e3a | 7341 | } |
221c5eb2 | 7342 | } |
79ebeaee | 7343 | spin_unlock(&ctx->completion_lock); |
aa43477b | 7344 | return found; |
221c5eb2 JA |
7345 | } |
7346 | ||
b21432b4 JA |
7347 | static struct io_kiocb *io_poll_find(struct io_ring_ctx *ctx, bool poll_only, |
7348 | struct io_cancel_data *cd) | |
e07785b0 | 7349 | __must_hold(&ctx->completion_lock) |
47f46768 | 7350 | { |
78076bb6 | 7351 | struct hlist_head *list; |
47f46768 JA |
7352 | struct io_kiocb *req; |
7353 | ||
b21432b4 | 7354 | list = &ctx->cancel_hash[hash_long(cd->data, ctx->cancel_hash_bits)]; |
78076bb6 | 7355 | hlist_for_each_entry(req, list, hash_node) { |
b21432b4 | 7356 | if (cd->data != req->cqe.user_data) |
b41e9852 | 7357 | continue; |
9ba5fac8 PB |
7358 | if (poll_only && req->opcode != IORING_OP_POLL_ADD) |
7359 | continue; | |
8e29da69 JA |
7360 | if (cd->flags & IORING_ASYNC_CANCEL_ALL) { |
7361 | if (cd->seq == req->work.cancel_seq) | |
7362 | continue; | |
7363 | req->work.cancel_seq = cd->seq; | |
7364 | } | |
b2cb805f | 7365 | return req; |
47f46768 | 7366 | } |
b2cb805f JA |
7367 | return NULL; |
7368 | } | |
7369 | ||
4bf94615 JA |
7370 | static struct io_kiocb *io_poll_file_find(struct io_ring_ctx *ctx, |
7371 | struct io_cancel_data *cd) | |
7372 | __must_hold(&ctx->completion_lock) | |
7373 | { | |
7374 | struct io_kiocb *req; | |
7375 | int i; | |
7376 | ||
7377 | for (i = 0; i < (1U << ctx->cancel_hash_bits); i++) { | |
7378 | struct hlist_head *list; | |
7379 | ||
7380 | list = &ctx->cancel_hash[i]; | |
7381 | hlist_for_each_entry(req, list, hash_node) { | |
970f256e JA |
7382 | if (!(cd->flags & IORING_ASYNC_CANCEL_ANY) && |
7383 | req->file != cd->file) | |
4bf94615 JA |
7384 | continue; |
7385 | if (cd->seq == req->work.cancel_seq) | |
7386 | continue; | |
7387 | req->work.cancel_seq = cd->seq; | |
7388 | return req; | |
7389 | } | |
7390 | } | |
7391 | return NULL; | |
7392 | } | |
7393 | ||
aa43477b PB |
7394 | static bool io_poll_disarm(struct io_kiocb *req) |
7395 | __must_hold(&ctx->completion_lock) | |
7396 | { | |
7397 | if (!io_poll_get_ownership(req)) | |
7398 | return false; | |
7399 | io_poll_remove_entries(req); | |
7400 | hash_del(&req->hash_node); | |
7401 | return true; | |
7402 | } | |
7403 | ||
b21432b4 | 7404 | static int io_poll_cancel(struct io_ring_ctx *ctx, struct io_cancel_data *cd) |
e07785b0 | 7405 | __must_hold(&ctx->completion_lock) |
b2cb805f | 7406 | { |
4bf94615 | 7407 | struct io_kiocb *req; |
b2cb805f | 7408 | |
970f256e | 7409 | if (cd->flags & (IORING_ASYNC_CANCEL_FD|IORING_ASYNC_CANCEL_ANY)) |
4bf94615 JA |
7410 | req = io_poll_file_find(ctx, cd); |
7411 | else | |
7412 | req = io_poll_find(ctx, false, cd); | |
b2cb805f JA |
7413 | if (!req) |
7414 | return -ENOENT; | |
aa43477b PB |
7415 | io_poll_cancel_req(req); |
7416 | return 0; | |
47f46768 JA |
7417 | } |
7418 | ||
9096af3e PB |
7419 | static __poll_t io_poll_parse_events(const struct io_uring_sqe *sqe, |
7420 | unsigned int flags) | |
7421 | { | |
7422 | u32 events; | |
47f46768 | 7423 | |
9096af3e PB |
7424 | events = READ_ONCE(sqe->poll32_events); |
7425 | #ifdef __BIG_ENDIAN | |
7426 | events = swahw32(events); | |
7427 | #endif | |
7428 | if (!(flags & IORING_POLL_ADD_MULTI)) | |
7429 | events |= EPOLLONESHOT; | |
7430 | return demangle_poll(events) | (events & (EPOLLEXCLUSIVE|EPOLLONESHOT)); | |
47f46768 JA |
7431 | } |
7432 | ||
54739cc6 | 7433 | static int io_poll_remove_prep(struct io_kiocb *req, |
3529d8c2 | 7434 | const struct io_uring_sqe *sqe) |
0969e783 | 7435 | { |
c5de0036 PB |
7436 | struct io_poll_update *upd = &req->poll_update; |
7437 | u32 flags; | |
7438 | ||
73911426 | 7439 | if (sqe->buf_index || sqe->splice_fd_in) |
c5de0036 PB |
7440 | return -EINVAL; |
7441 | flags = READ_ONCE(sqe->len); | |
7442 | if (flags & ~(IORING_POLL_UPDATE_EVENTS | IORING_POLL_UPDATE_USER_DATA | | |
7443 | IORING_POLL_ADD_MULTI)) | |
7444 | return -EINVAL; | |
7445 | /* meaningless without update */ | |
7446 | if (flags == IORING_POLL_ADD_MULTI) | |
0969e783 JA |
7447 | return -EINVAL; |
7448 | ||
c5de0036 PB |
7449 | upd->old_user_data = READ_ONCE(sqe->addr); |
7450 | upd->update_events = flags & IORING_POLL_UPDATE_EVENTS; | |
7451 | upd->update_user_data = flags & IORING_POLL_UPDATE_USER_DATA; | |
221c5eb2 | 7452 | |
c5de0036 PB |
7453 | upd->new_user_data = READ_ONCE(sqe->off); |
7454 | if (!upd->update_user_data && upd->new_user_data) | |
7455 | return -EINVAL; | |
7456 | if (upd->update_events) | |
7457 | upd->events = io_poll_parse_events(sqe, flags); | |
7458 | else if (sqe->poll32_events) | |
7459 | return -EINVAL; | |
221c5eb2 | 7460 | |
221c5eb2 JA |
7461 | return 0; |
7462 | } | |
7463 | ||
3529d8c2 | 7464 | static int io_poll_add_prep(struct io_kiocb *req, const struct io_uring_sqe *sqe) |
221c5eb2 JA |
7465 | { |
7466 | struct io_poll_iocb *poll = &req->poll; | |
c5de0036 | 7467 | u32 flags; |
221c5eb2 | 7468 | |
73911426 | 7469 | if (sqe->buf_index || sqe->off || sqe->addr) |
88e41cf9 JA |
7470 | return -EINVAL; |
7471 | flags = READ_ONCE(sqe->len); | |
c5de0036 | 7472 | if (flags & ~IORING_POLL_ADD_MULTI) |
221c5eb2 | 7473 | return -EINVAL; |
04c76b41 PB |
7474 | if ((flags & IORING_POLL_ADD_MULTI) && (req->flags & REQ_F_CQE_SKIP)) |
7475 | return -EINVAL; | |
221c5eb2 | 7476 | |
48dcd38d | 7477 | io_req_set_refcount(req); |
2804ecd8 | 7478 | req->apoll_events = poll->events = io_poll_parse_events(sqe, flags); |
0969e783 JA |
7479 | return 0; |
7480 | } | |
7481 | ||
61e98203 | 7482 | static int io_poll_add(struct io_kiocb *req, unsigned int issue_flags) |
0969e783 JA |
7483 | { |
7484 | struct io_poll_iocb *poll = &req->poll; | |
0969e783 | 7485 | struct io_poll_table ipt; |
aa43477b | 7486 | int ret; |
0969e783 | 7487 | |
d7718a9d | 7488 | ipt.pt._qproc = io_poll_queue_proc; |
36703247 | 7489 | |
aa43477b PB |
7490 | ret = __io_arm_poll_handler(req, &req->poll, &ipt, poll->events); |
7491 | ret = ret ?: ipt.error; | |
7492 | if (ret) | |
7493 | __io_req_complete(req, issue_flags, ret, 0); | |
7494 | return 0; | |
221c5eb2 JA |
7495 | } |
7496 | ||
54739cc6 | 7497 | static int io_poll_remove(struct io_kiocb *req, unsigned int issue_flags) |
b69de288 | 7498 | { |
b21432b4 | 7499 | struct io_cancel_data cd = { .data = req->poll_update.old_user_data, }; |
b69de288 JA |
7500 | struct io_ring_ctx *ctx = req->ctx; |
7501 | struct io_kiocb *preq; | |
2bbb146d | 7502 | int ret2, ret = 0; |
cc8e9ba7 | 7503 | bool locked; |
b69de288 | 7504 | |
79ebeaee | 7505 | spin_lock(&ctx->completion_lock); |
b21432b4 | 7506 | preq = io_poll_find(ctx, true, &cd); |
aa43477b | 7507 | if (!preq || !io_poll_disarm(preq)) { |
79ebeaee | 7508 | spin_unlock(&ctx->completion_lock); |
aa43477b | 7509 | ret = preq ? -EALREADY : -ENOENT; |
2bbb146d | 7510 | goto out; |
b69de288 | 7511 | } |
79ebeaee | 7512 | spin_unlock(&ctx->completion_lock); |
cb3b200e | 7513 | |
2bbb146d PB |
7514 | if (req->poll_update.update_events || req->poll_update.update_user_data) { |
7515 | /* only mask one event flags, keep behavior flags */ | |
7516 | if (req->poll_update.update_events) { | |
7517 | preq->poll.events &= ~0xffff; | |
7518 | preq->poll.events |= req->poll_update.events & 0xffff; | |
7519 | preq->poll.events |= IO_POLL_UNMASK; | |
cb3b200e | 7520 | } |
2bbb146d | 7521 | if (req->poll_update.update_user_data) |
cef216fc | 7522 | preq->cqe.user_data = req->poll_update.new_user_data; |
b69de288 | 7523 | |
2bbb146d PB |
7524 | ret2 = io_poll_add(preq, issue_flags); |
7525 | /* successfully updated, don't complete poll request */ | |
7526 | if (!ret2) | |
7527 | goto out; | |
b69de288 | 7528 | } |
6224590d | 7529 | |
2bbb146d | 7530 | req_set_fail(preq); |
cef216fc | 7531 | preq->cqe.res = -ECANCELED; |
cc8e9ba7 PB |
7532 | locked = !(issue_flags & IO_URING_F_UNLOCKED); |
7533 | io_req_task_complete(preq, &locked); | |
2bbb146d PB |
7534 | out: |
7535 | if (ret < 0) | |
6224590d | 7536 | req_set_fail(req); |
2bbb146d | 7537 | /* complete update request, we're done with it */ |
cc8e9ba7 | 7538 | __io_req_complete(req, issue_flags, ret, 0); |
b69de288 | 7539 | return 0; |
89850fce JA |
7540 | } |
7541 | ||
5262f567 JA |
7542 | static enum hrtimer_restart io_timeout_fn(struct hrtimer *timer) |
7543 | { | |
ad8a48ac JA |
7544 | struct io_timeout_data *data = container_of(timer, |
7545 | struct io_timeout_data, timer); | |
7546 | struct io_kiocb *req = data->req; | |
7547 | struct io_ring_ctx *ctx = req->ctx; | |
5262f567 JA |
7548 | unsigned long flags; |
7549 | ||
89850fce | 7550 | spin_lock_irqsave(&ctx->timeout_lock, flags); |
a71976f3 | 7551 | list_del_init(&req->timeout.list); |
01cec8c1 PB |
7552 | atomic_set(&req->ctx->cq_timeouts, |
7553 | atomic_read(&req->ctx->cq_timeouts) + 1); | |
89850fce | 7554 | spin_unlock_irqrestore(&ctx->timeout_lock, flags); |
01cec8c1 | 7555 | |
a90c8bf6 PB |
7556 | if (!(data->flags & IORING_TIMEOUT_ETIME_SUCCESS)) |
7557 | req_set_fail(req); | |
7558 | ||
cef216fc | 7559 | req->cqe.res = -ETIME; |
a90c8bf6 | 7560 | req->io_task_work.func = io_req_task_complete; |
3fe07bcd | 7561 | io_req_task_work_add(req); |
5262f567 JA |
7562 | return HRTIMER_NORESTART; |
7563 | } | |
7564 | ||
fbd15848 | 7565 | static struct io_kiocb *io_timeout_extract(struct io_ring_ctx *ctx, |
b21432b4 | 7566 | struct io_cancel_data *cd) |
89850fce | 7567 | __must_hold(&ctx->timeout_lock) |
f254ac04 | 7568 | { |
fbd15848 | 7569 | struct io_timeout_data *io; |
47f46768 | 7570 | struct io_kiocb *req; |
fd9c7bc5 | 7571 | bool found = false; |
f254ac04 | 7572 | |
135fcde8 | 7573 | list_for_each_entry(req, &ctx->timeout_list, timeout.list) { |
970f256e JA |
7574 | if (!(cd->flags & IORING_ASYNC_CANCEL_ANY) && |
7575 | cd->data != req->cqe.user_data) | |
8e29da69 | 7576 | continue; |
970f256e | 7577 | if (cd->flags & (IORING_ASYNC_CANCEL_ALL|IORING_ASYNC_CANCEL_ANY)) { |
8e29da69 JA |
7578 | if (cd->seq == req->work.cancel_seq) |
7579 | continue; | |
7580 | req->work.cancel_seq = cd->seq; | |
7581 | } | |
7582 | found = true; | |
7583 | break; | |
47f46768 | 7584 | } |
fd9c7bc5 PB |
7585 | if (!found) |
7586 | return ERR_PTR(-ENOENT); | |
fbd15848 PB |
7587 | |
7588 | io = req->async_data; | |
fd9c7bc5 | 7589 | if (hrtimer_try_to_cancel(&io->timer) == -1) |
fbd15848 | 7590 | return ERR_PTR(-EALREADY); |
a71976f3 | 7591 | list_del_init(&req->timeout.list); |
fbd15848 PB |
7592 | return req; |
7593 | } | |
47f46768 | 7594 | |
b21432b4 | 7595 | static int io_timeout_cancel(struct io_ring_ctx *ctx, struct io_cancel_data *cd) |
ec3c3d0f | 7596 | __must_hold(&ctx->completion_lock) |
fbd15848 | 7597 | { |
3645c200 PB |
7598 | struct io_kiocb *req; |
7599 | ||
7600 | spin_lock_irq(&ctx->timeout_lock); | |
b21432b4 | 7601 | req = io_timeout_extract(ctx, cd); |
3645c200 | 7602 | spin_unlock_irq(&ctx->timeout_lock); |
fbd15848 PB |
7603 | |
7604 | if (IS_ERR(req)) | |
7605 | return PTR_ERR(req); | |
6695490d | 7606 | io_req_task_queue_fail(req, -ECANCELED); |
f254ac04 JA |
7607 | return 0; |
7608 | } | |
7609 | ||
50c1df2b JA |
7610 | static clockid_t io_timeout_get_clock(struct io_timeout_data *data) |
7611 | { | |
7612 | switch (data->flags & IORING_TIMEOUT_CLOCK_MASK) { | |
7613 | case IORING_TIMEOUT_BOOTTIME: | |
7614 | return CLOCK_BOOTTIME; | |
7615 | case IORING_TIMEOUT_REALTIME: | |
7616 | return CLOCK_REALTIME; | |
7617 | default: | |
7618 | /* can't happen, vetted at prep time */ | |
7619 | WARN_ON_ONCE(1); | |
7620 | fallthrough; | |
7621 | case 0: | |
7622 | return CLOCK_MONOTONIC; | |
7623 | } | |
7624 | } | |
7625 | ||
f1042b6c PB |
7626 | static int io_linked_timeout_update(struct io_ring_ctx *ctx, __u64 user_data, |
7627 | struct timespec64 *ts, enum hrtimer_mode mode) | |
7628 | __must_hold(&ctx->timeout_lock) | |
7629 | { | |
7630 | struct io_timeout_data *io; | |
7631 | struct io_kiocb *req; | |
7632 | bool found = false; | |
7633 | ||
7634 | list_for_each_entry(req, &ctx->ltimeout_list, timeout.list) { | |
cef216fc | 7635 | found = user_data == req->cqe.user_data; |
f1042b6c PB |
7636 | if (found) |
7637 | break; | |
7638 | } | |
7639 | if (!found) | |
7640 | return -ENOENT; | |
7641 | ||
7642 | io = req->async_data; | |
7643 | if (hrtimer_try_to_cancel(&io->timer) == -1) | |
7644 | return -EALREADY; | |
7645 | hrtimer_init(&io->timer, io_timeout_get_clock(io), mode); | |
7646 | io->timer.function = io_link_timeout_fn; | |
7647 | hrtimer_start(&io->timer, timespec64_to_ktime(*ts), mode); | |
7648 | return 0; | |
7649 | } | |
7650 | ||
9c8e11b3 PB |
7651 | static int io_timeout_update(struct io_ring_ctx *ctx, __u64 user_data, |
7652 | struct timespec64 *ts, enum hrtimer_mode mode) | |
89850fce | 7653 | __must_hold(&ctx->timeout_lock) |
47f46768 | 7654 | { |
b21432b4 JA |
7655 | struct io_cancel_data cd = { .data = user_data, }; |
7656 | struct io_kiocb *req = io_timeout_extract(ctx, &cd); | |
9c8e11b3 | 7657 | struct io_timeout_data *data; |
47f46768 | 7658 | |
9c8e11b3 PB |
7659 | if (IS_ERR(req)) |
7660 | return PTR_ERR(req); | |
47f46768 | 7661 | |
9c8e11b3 PB |
7662 | req->timeout.off = 0; /* noseq */ |
7663 | data = req->async_data; | |
7664 | list_add_tail(&req->timeout.list, &ctx->timeout_list); | |
50c1df2b | 7665 | hrtimer_init(&data->timer, io_timeout_get_clock(data), mode); |
9c8e11b3 PB |
7666 | data->timer.function = io_timeout_fn; |
7667 | hrtimer_start(&data->timer, timespec64_to_ktime(*ts), mode); | |
7668 | return 0; | |
47f46768 JA |
7669 | } |
7670 | ||
3529d8c2 JA |
7671 | static int io_timeout_remove_prep(struct io_kiocb *req, |
7672 | const struct io_uring_sqe *sqe) | |
b29472ee | 7673 | { |
9c8e11b3 PB |
7674 | struct io_timeout_rem *tr = &req->timeout_rem; |
7675 | ||
61710e43 DA |
7676 | if (unlikely(req->flags & (REQ_F_FIXED_FILE | REQ_F_BUFFER_SELECT))) |
7677 | return -EINVAL; | |
73911426 | 7678 | if (sqe->buf_index || sqe->len || sqe->splice_fd_in) |
b29472ee JA |
7679 | return -EINVAL; |
7680 | ||
f1042b6c | 7681 | tr->ltimeout = false; |
9c8e11b3 PB |
7682 | tr->addr = READ_ONCE(sqe->addr); |
7683 | tr->flags = READ_ONCE(sqe->timeout_flags); | |
f1042b6c PB |
7684 | if (tr->flags & IORING_TIMEOUT_UPDATE_MASK) { |
7685 | if (hweight32(tr->flags & IORING_TIMEOUT_CLOCK_MASK) > 1) | |
7686 | return -EINVAL; | |
7687 | if (tr->flags & IORING_LINK_TIMEOUT_UPDATE) | |
7688 | tr->ltimeout = true; | |
7689 | if (tr->flags & ~(IORING_TIMEOUT_UPDATE_MASK|IORING_TIMEOUT_ABS)) | |
9c8e11b3 PB |
7690 | return -EINVAL; |
7691 | if (get_timespec64(&tr->ts, u64_to_user_ptr(sqe->addr2))) | |
7692 | return -EFAULT; | |
2087009c YB |
7693 | if (tr->ts.tv_sec < 0 || tr->ts.tv_nsec < 0) |
7694 | return -EINVAL; | |
9c8e11b3 PB |
7695 | } else if (tr->flags) { |
7696 | /* timeout removal doesn't support flags */ | |
b29472ee | 7697 | return -EINVAL; |
9c8e11b3 | 7698 | } |
b29472ee | 7699 | |
b29472ee JA |
7700 | return 0; |
7701 | } | |
7702 | ||
8662daec PB |
7703 | static inline enum hrtimer_mode io_translate_timeout_mode(unsigned int flags) |
7704 | { | |
7705 | return (flags & IORING_TIMEOUT_ABS) ? HRTIMER_MODE_ABS | |
7706 | : HRTIMER_MODE_REL; | |
7707 | } | |
7708 | ||
11365043 JA |
7709 | /* |
7710 | * Remove or update an existing timeout command | |
7711 | */ | |
61e98203 | 7712 | static int io_timeout_remove(struct io_kiocb *req, unsigned int issue_flags) |
11365043 | 7713 | { |
9c8e11b3 | 7714 | struct io_timeout_rem *tr = &req->timeout_rem; |
11365043 | 7715 | struct io_ring_ctx *ctx = req->ctx; |
47f46768 | 7716 | int ret; |
11365043 | 7717 | |
ec3c3d0f | 7718 | if (!(req->timeout_rem.flags & IORING_TIMEOUT_UPDATE)) { |
b21432b4 JA |
7719 | struct io_cancel_data cd = { .data = tr->addr, }; |
7720 | ||
ec3c3d0f | 7721 | spin_lock(&ctx->completion_lock); |
b21432b4 | 7722 | ret = io_timeout_cancel(ctx, &cd); |
ec3c3d0f PB |
7723 | spin_unlock(&ctx->completion_lock); |
7724 | } else { | |
f1042b6c PB |
7725 | enum hrtimer_mode mode = io_translate_timeout_mode(tr->flags); |
7726 | ||
ec3c3d0f | 7727 | spin_lock_irq(&ctx->timeout_lock); |
f1042b6c PB |
7728 | if (tr->ltimeout) |
7729 | ret = io_linked_timeout_update(ctx, tr->addr, &tr->ts, mode); | |
7730 | else | |
7731 | ret = io_timeout_update(ctx, tr->addr, &tr->ts, mode); | |
ec3c3d0f PB |
7732 | spin_unlock_irq(&ctx->timeout_lock); |
7733 | } | |
11365043 | 7734 | |
4e88d6e7 | 7735 | if (ret < 0) |
93d2bcd2 | 7736 | req_set_fail(req); |
505657bc | 7737 | io_req_complete_post(req, ret, 0); |
11365043 | 7738 | return 0; |
5262f567 JA |
7739 | } |
7740 | ||
ecddc25d JA |
7741 | static int __io_timeout_prep(struct io_kiocb *req, |
7742 | const struct io_uring_sqe *sqe, | |
7743 | bool is_timeout_link) | |
5262f567 | 7744 | { |
ad8a48ac | 7745 | struct io_timeout_data *data; |
a41525ab | 7746 | unsigned flags; |
56080b02 | 7747 | u32 off = READ_ONCE(sqe->off); |
5262f567 | 7748 | |
73911426 | 7749 | if (sqe->buf_index || sqe->len != 1 || sqe->splice_fd_in) |
a41525ab | 7750 | return -EINVAL; |
56080b02 | 7751 | if (off && is_timeout_link) |
2d28390a | 7752 | return -EINVAL; |
a41525ab | 7753 | flags = READ_ONCE(sqe->timeout_flags); |
6224590d PB |
7754 | if (flags & ~(IORING_TIMEOUT_ABS | IORING_TIMEOUT_CLOCK_MASK | |
7755 | IORING_TIMEOUT_ETIME_SUCCESS)) | |
50c1df2b JA |
7756 | return -EINVAL; |
7757 | /* more than one clock specified is invalid, obviously */ | |
7758 | if (hweight32(flags & IORING_TIMEOUT_CLOCK_MASK) > 1) | |
5262f567 | 7759 | return -EINVAL; |
bdf20073 | 7760 | |
ef9dd637 | 7761 | INIT_LIST_HEAD(&req->timeout.list); |
bfe68a22 | 7762 | req->timeout.off = off; |
f18ee4cf PB |
7763 | if (unlikely(off && !req->ctx->off_timeout_used)) |
7764 | req->ctx->off_timeout_used = true; | |
26a61679 | 7765 | |
d6a644a7 PB |
7766 | if (WARN_ON_ONCE(req_has_async_data(req))) |
7767 | return -EFAULT; | |
7768 | if (io_alloc_async_data(req)) | |
26a61679 JA |
7769 | return -ENOMEM; |
7770 | ||
e8c2bc1f | 7771 | data = req->async_data; |
ad8a48ac | 7772 | data->req = req; |
50c1df2b | 7773 | data->flags = flags; |
ad8a48ac JA |
7774 | |
7775 | if (get_timespec64(&data->ts, u64_to_user_ptr(sqe->addr))) | |
5262f567 JA |
7776 | return -EFAULT; |
7777 | ||
f6223ff7 YB |
7778 | if (data->ts.tv_sec < 0 || data->ts.tv_nsec < 0) |
7779 | return -EINVAL; | |
7780 | ||
e677edbc | 7781 | INIT_LIST_HEAD(&req->timeout.list); |
8662daec | 7782 | data->mode = io_translate_timeout_mode(flags); |
50c1df2b | 7783 | hrtimer_init(&data->timer, io_timeout_get_clock(data), data->mode); |
b97e736a PB |
7784 | |
7785 | if (is_timeout_link) { | |
7786 | struct io_submit_link *link = &req->ctx->submit_state.link; | |
7787 | ||
7788 | if (!link->head) | |
7789 | return -EINVAL; | |
7790 | if (link->last->opcode == IORING_OP_LINK_TIMEOUT) | |
7791 | return -EINVAL; | |
4d13d1a4 PB |
7792 | req->timeout.head = link->last; |
7793 | link->last->flags |= REQ_F_ARM_LTIMEOUT; | |
b97e736a | 7794 | } |
ad8a48ac JA |
7795 | return 0; |
7796 | } | |
7797 | ||
ecddc25d JA |
7798 | static int io_timeout_prep(struct io_kiocb *req, |
7799 | const struct io_uring_sqe *sqe) | |
7800 | { | |
7801 | return __io_timeout_prep(req, sqe, false); | |
7802 | } | |
7803 | ||
7804 | static int io_link_timeout_prep(struct io_kiocb *req, | |
7805 | const struct io_uring_sqe *sqe) | |
7806 | { | |
7807 | return __io_timeout_prep(req, sqe, true); | |
7808 | } | |
7809 | ||
61e98203 | 7810 | static int io_timeout(struct io_kiocb *req, unsigned int issue_flags) |
ad8a48ac | 7811 | { |
ad8a48ac | 7812 | struct io_ring_ctx *ctx = req->ctx; |
e8c2bc1f | 7813 | struct io_timeout_data *data = req->async_data; |
ad8a48ac | 7814 | struct list_head *entry; |
bfe68a22 | 7815 | u32 tail, off = req->timeout.off; |
ad8a48ac | 7816 | |
89850fce | 7817 | spin_lock_irq(&ctx->timeout_lock); |
93bd25bb | 7818 | |
5262f567 JA |
7819 | /* |
7820 | * sqe->off holds how many events that need to occur for this | |
93bd25bb JA |
7821 | * timeout event to be satisfied. If it isn't set, then this is |
7822 | * a pure timeout request, sequence isn't used. | |
5262f567 | 7823 | */ |
8eb7e2d0 | 7824 | if (io_is_timeout_noseq(req)) { |
93bd25bb JA |
7825 | entry = ctx->timeout_list.prev; |
7826 | goto add; | |
7827 | } | |
5262f567 | 7828 | |
bfe68a22 PB |
7829 | tail = ctx->cached_cq_tail - atomic_read(&ctx->cq_timeouts); |
7830 | req->timeout.target_seq = tail + off; | |
5262f567 | 7831 | |
f010505b MDG |
7832 | /* Update the last seq here in case io_flush_timeouts() hasn't. |
7833 | * This is safe because ->completion_lock is held, and submissions | |
7834 | * and completions are never mixed in the same ->completion_lock section. | |
7835 | */ | |
7836 | ctx->cq_last_tm_flush = tail; | |
7837 | ||
5262f567 JA |
7838 | /* |
7839 | * Insertion sort, ensuring the first entry in the list is always | |
7840 | * the one we need first. | |
7841 | */ | |
5262f567 | 7842 | list_for_each_prev(entry, &ctx->timeout_list) { |
135fcde8 PB |
7843 | struct io_kiocb *nxt = list_entry(entry, struct io_kiocb, |
7844 | timeout.list); | |
5262f567 | 7845 | |
8eb7e2d0 | 7846 | if (io_is_timeout_noseq(nxt)) |
93bd25bb | 7847 | continue; |
bfe68a22 PB |
7848 | /* nxt.seq is behind @tail, otherwise would've been completed */ |
7849 | if (off >= nxt->timeout.target_seq - tail) | |
5262f567 JA |
7850 | break; |
7851 | } | |
93bd25bb | 7852 | add: |
135fcde8 | 7853 | list_add(&req->timeout.list, entry); |
ad8a48ac JA |
7854 | data->timer.function = io_timeout_fn; |
7855 | hrtimer_start(&data->timer, timespec64_to_ktime(data->ts), data->mode); | |
89850fce | 7856 | spin_unlock_irq(&ctx->timeout_lock); |
5262f567 JA |
7857 | return 0; |
7858 | } | |
5262f567 | 7859 | |
62755e35 JA |
7860 | static bool io_cancel_cb(struct io_wq_work *work, void *data) |
7861 | { | |
7862 | struct io_kiocb *req = container_of(work, struct io_kiocb, work); | |
f458dd84 | 7863 | struct io_cancel_data *cd = data; |
62755e35 | 7864 | |
8e29da69 JA |
7865 | if (req->ctx != cd->ctx) |
7866 | return false; | |
970f256e JA |
7867 | if (cd->flags & IORING_ASYNC_CANCEL_ANY) { |
7868 | ; | |
7869 | } else if (cd->flags & IORING_ASYNC_CANCEL_FD) { | |
4bf94615 JA |
7870 | if (req->file != cd->file) |
7871 | return false; | |
7872 | } else { | |
7873 | if (req->cqe.user_data != cd->data) | |
7874 | return false; | |
7875 | } | |
970f256e | 7876 | if (cd->flags & (IORING_ASYNC_CANCEL_ALL|IORING_ASYNC_CANCEL_ANY)) { |
8e29da69 JA |
7877 | if (cd->seq == req->work.cancel_seq) |
7878 | return false; | |
7879 | req->work.cancel_seq = cd->seq; | |
7880 | } | |
7881 | return true; | |
62755e35 JA |
7882 | } |
7883 | ||
b21432b4 JA |
7884 | static int io_async_cancel_one(struct io_uring_task *tctx, |
7885 | struct io_cancel_data *cd) | |
62755e35 | 7886 | { |
62755e35 | 7887 | enum io_wq_cancel cancel_ret; |
62755e35 | 7888 | int ret = 0; |
970f256e | 7889 | bool all; |
62755e35 | 7890 | |
f458dd84 | 7891 | if (!tctx || !tctx->io_wq) |
5aa75ed5 JA |
7892 | return -ENOENT; |
7893 | ||
970f256e JA |
7894 | all = cd->flags & (IORING_ASYNC_CANCEL_ALL|IORING_ASYNC_CANCEL_ANY); |
7895 | cancel_ret = io_wq_cancel_cb(tctx->io_wq, io_cancel_cb, cd, all); | |
62755e35 JA |
7896 | switch (cancel_ret) { |
7897 | case IO_WQ_CANCEL_OK: | |
7898 | ret = 0; | |
7899 | break; | |
7900 | case IO_WQ_CANCEL_RUNNING: | |
7901 | ret = -EALREADY; | |
7902 | break; | |
7903 | case IO_WQ_CANCEL_NOTFOUND: | |
7904 | ret = -ENOENT; | |
7905 | break; | |
7906 | } | |
7907 | ||
e977d6d3 JA |
7908 | return ret; |
7909 | } | |
7910 | ||
b21432b4 | 7911 | static int io_try_cancel(struct io_kiocb *req, struct io_cancel_data *cd) |
47f46768 | 7912 | { |
8cb01fac | 7913 | struct io_ring_ctx *ctx = req->ctx; |
47f46768 JA |
7914 | int ret; |
7915 | ||
dadebc35 | 7916 | WARN_ON_ONCE(!io_wq_current_is_worker() && req->task != current); |
8cb01fac | 7917 | |
b21432b4 | 7918 | ret = io_async_cancel_one(req->task->io_uring, cd); |
ccbf7261 JA |
7919 | /* |
7920 | * Fall-through even for -EALREADY, as we may have poll armed | |
7921 | * that need unarming. | |
7922 | */ | |
7923 | if (!ret) | |
7924 | return 0; | |
505657bc PB |
7925 | |
7926 | spin_lock(&ctx->completion_lock); | |
b21432b4 | 7927 | ret = io_poll_cancel(ctx, cd); |
ccbf7261 JA |
7928 | if (ret != -ENOENT) |
7929 | goto out; | |
4bf94615 JA |
7930 | if (!(cd->flags & IORING_ASYNC_CANCEL_FD)) |
7931 | ret = io_timeout_cancel(ctx, cd); | |
505657bc PB |
7932 | out: |
7933 | spin_unlock(&ctx->completion_lock); | |
7934 | return ret; | |
47f46768 JA |
7935 | } |
7936 | ||
970f256e JA |
7937 | #define CANCEL_FLAGS (IORING_ASYNC_CANCEL_ALL | IORING_ASYNC_CANCEL_FD | \ |
7938 | IORING_ASYNC_CANCEL_ANY) | |
7939 | ||
3529d8c2 JA |
7940 | static int io_async_cancel_prep(struct io_kiocb *req, |
7941 | const struct io_uring_sqe *sqe) | |
e977d6d3 | 7942 | { |
4bf94615 | 7943 | if (unlikely(req->flags & REQ_F_BUFFER_SELECT)) |
61710e43 | 7944 | return -EINVAL; |
73911426 | 7945 | if (sqe->off || sqe->len || sqe->splice_fd_in) |
e977d6d3 JA |
7946 | return -EINVAL; |
7947 | ||
fbf23849 | 7948 | req->cancel.addr = READ_ONCE(sqe->addr); |
8e29da69 | 7949 | req->cancel.flags = READ_ONCE(sqe->cancel_flags); |
970f256e | 7950 | if (req->cancel.flags & ~CANCEL_FLAGS) |
8e29da69 | 7951 | return -EINVAL; |
970f256e JA |
7952 | if (req->cancel.flags & IORING_ASYNC_CANCEL_FD) { |
7953 | if (req->cancel.flags & IORING_ASYNC_CANCEL_ANY) | |
7954 | return -EINVAL; | |
4bf94615 | 7955 | req->cancel.fd = READ_ONCE(sqe->fd); |
970f256e | 7956 | } |
8e29da69 | 7957 | |
fbf23849 JA |
7958 | return 0; |
7959 | } | |
7960 | ||
8e29da69 JA |
7961 | static int __io_async_cancel(struct io_cancel_data *cd, struct io_kiocb *req, |
7962 | unsigned int issue_flags) | |
fbf23849 | 7963 | { |
970f256e | 7964 | bool all = cd->flags & (IORING_ASYNC_CANCEL_ALL|IORING_ASYNC_CANCEL_ANY); |
8e29da69 | 7965 | struct io_ring_ctx *ctx = cd->ctx; |
58f99373 | 7966 | struct io_tctx_node *node; |
8e29da69 | 7967 | int ret, nr = 0; |
58f99373 | 7968 | |
8e29da69 JA |
7969 | do { |
7970 | ret = io_try_cancel(req, cd); | |
7971 | if (ret == -ENOENT) | |
7972 | break; | |
970f256e | 7973 | if (!all) |
8e29da69 JA |
7974 | return ret; |
7975 | nr++; | |
7976 | } while (1); | |
58f99373 PB |
7977 | |
7978 | /* slow path, try all io-wq's */ | |
f8929630 | 7979 | io_ring_submit_lock(ctx, issue_flags); |
58f99373 PB |
7980 | ret = -ENOENT; |
7981 | list_for_each_entry(node, &ctx->tctx_list, ctx_node) { | |
7982 | struct io_uring_task *tctx = node->task->io_uring; | |
fbf23849 | 7983 | |
8e29da69 JA |
7984 | ret = io_async_cancel_one(tctx, cd); |
7985 | if (ret != -ENOENT) { | |
970f256e | 7986 | if (!all) |
8e29da69 JA |
7987 | break; |
7988 | nr++; | |
7989 | } | |
58f99373 | 7990 | } |
f8929630 | 7991 | io_ring_submit_unlock(ctx, issue_flags); |
970f256e | 7992 | return all ? nr : ret; |
8e29da69 JA |
7993 | } |
7994 | ||
7995 | static int io_async_cancel(struct io_kiocb *req, unsigned int issue_flags) | |
7996 | { | |
7997 | struct io_cancel_data cd = { | |
7998 | .ctx = req->ctx, | |
7999 | .data = req->cancel.addr, | |
8000 | .flags = req->cancel.flags, | |
8001 | .seq = atomic_inc_return(&req->ctx->cancel_seq), | |
8002 | }; | |
8003 | int ret; | |
8004 | ||
4bf94615 JA |
8005 | if (cd.flags & IORING_ASYNC_CANCEL_FD) { |
8006 | if (req->flags & REQ_F_FIXED_FILE) | |
8007 | req->file = io_file_get_fixed(req, req->cancel.fd, | |
8008 | issue_flags); | |
8009 | else | |
8010 | req->file = io_file_get_normal(req, req->cancel.fd); | |
8011 | if (!req->file) { | |
8012 | ret = -EBADF; | |
8013 | goto done; | |
8014 | } | |
8015 | cd.file = req->file; | |
58f99373 | 8016 | } |
4bf94615 | 8017 | |
8e29da69 | 8018 | ret = __io_async_cancel(&cd, req, issue_flags); |
58f99373 | 8019 | done: |
58f99373 | 8020 | if (ret < 0) |
93d2bcd2 | 8021 | req_set_fail(req); |
505657bc | 8022 | io_req_complete_post(req, ret, 0); |
5262f567 JA |
8023 | return 0; |
8024 | } | |
8025 | ||
54739cc6 | 8026 | static int io_files_update_prep(struct io_kiocb *req, |
05f3fb3c JA |
8027 | const struct io_uring_sqe *sqe) |
8028 | { | |
61710e43 DA |
8029 | if (unlikely(req->flags & (REQ_F_FIXED_FILE | REQ_F_BUFFER_SELECT))) |
8030 | return -EINVAL; | |
73911426 | 8031 | if (sqe->rw_flags || sqe->splice_fd_in) |
05f3fb3c JA |
8032 | return -EINVAL; |
8033 | ||
269bbe5f BM |
8034 | req->rsrc_update.offset = READ_ONCE(sqe->off); |
8035 | req->rsrc_update.nr_args = READ_ONCE(sqe->len); | |
8036 | if (!req->rsrc_update.nr_args) | |
05f3fb3c | 8037 | return -EINVAL; |
269bbe5f | 8038 | req->rsrc_update.arg = READ_ONCE(sqe->addr); |
05f3fb3c JA |
8039 | return 0; |
8040 | } | |
8041 | ||
a7c41b46 XW |
8042 | static int io_files_update_with_index_alloc(struct io_kiocb *req, |
8043 | unsigned int issue_flags) | |
8044 | { | |
8045 | __s32 __user *fds = u64_to_user_ptr(req->rsrc_update.arg); | |
8046 | unsigned int done; | |
8047 | struct file *file; | |
8048 | int ret, fd; | |
8049 | ||
8050 | for (done = 0; done < req->rsrc_update.nr_args; done++) { | |
8051 | if (copy_from_user(&fd, &fds[done], sizeof(fd))) { | |
8052 | ret = -EFAULT; | |
8053 | break; | |
8054 | } | |
8055 | ||
8056 | file = fget(fd); | |
8057 | if (!file) { | |
8058 | ret = -EBADF; | |
8059 | break; | |
8060 | } | |
8061 | ret = io_fixed_fd_install(req, issue_flags, file, | |
8062 | IORING_FILE_INDEX_ALLOC); | |
8063 | if (ret < 0) | |
8064 | break; | |
8065 | if (copy_to_user(&fds[done], &ret, sizeof(ret))) { | |
8066 | ret = -EFAULT; | |
8067 | __io_close_fixed(req, issue_flags, ret); | |
8068 | break; | |
8069 | } | |
8070 | } | |
8071 | ||
8072 | if (done) | |
8073 | return done; | |
8074 | return ret; | |
8075 | } | |
8076 | ||
889fca73 | 8077 | static int io_files_update(struct io_kiocb *req, unsigned int issue_flags) |
fbf23849 JA |
8078 | { |
8079 | struct io_ring_ctx *ctx = req->ctx; | |
c3bdad02 | 8080 | struct io_uring_rsrc_update2 up; |
05f3fb3c | 8081 | int ret; |
fbf23849 | 8082 | |
269bbe5f BM |
8083 | up.offset = req->rsrc_update.offset; |
8084 | up.data = req->rsrc_update.arg; | |
c3bdad02 PB |
8085 | up.nr = 0; |
8086 | up.tags = 0; | |
615cee49 | 8087 | up.resv = 0; |
d8a3ba9c | 8088 | up.resv2 = 0; |
05f3fb3c | 8089 | |
a7c41b46 XW |
8090 | if (req->rsrc_update.offset == IORING_FILE_INDEX_ALLOC) { |
8091 | ret = io_files_update_with_index_alloc(req, issue_flags); | |
8092 | } else { | |
8093 | io_ring_submit_lock(ctx, issue_flags); | |
8094 | ret = __io_register_rsrc_update(ctx, IORING_RSRC_FILE, | |
8095 | &up, req->rsrc_update.nr_args); | |
8096 | io_ring_submit_unlock(ctx, issue_flags); | |
8097 | } | |
05f3fb3c JA |
8098 | |
8099 | if (ret < 0) | |
93d2bcd2 | 8100 | req_set_fail(req); |
889fca73 | 8101 | __io_req_complete(req, issue_flags, ret, 0); |
5262f567 JA |
8102 | return 0; |
8103 | } | |
8104 | ||
bfe76559 | 8105 | static int io_req_prep(struct io_kiocb *req, const struct io_uring_sqe *sqe) |
f67676d1 | 8106 | { |
d625c6ee | 8107 | switch (req->opcode) { |
e781573e | 8108 | case IORING_OP_NOP: |
2bb04df7 | 8109 | return io_nop_prep(req, sqe); |
f67676d1 JA |
8110 | case IORING_OP_READV: |
8111 | case IORING_OP_READ_FIXED: | |
3a6820f2 | 8112 | case IORING_OP_READ: |
f67676d1 JA |
8113 | case IORING_OP_WRITEV: |
8114 | case IORING_OP_WRITE_FIXED: | |
3a6820f2 | 8115 | case IORING_OP_WRITE: |
584b0180 | 8116 | return io_prep_rw(req, sqe); |
0969e783 | 8117 | case IORING_OP_POLL_ADD: |
bfe76559 | 8118 | return io_poll_add_prep(req, sqe); |
0969e783 | 8119 | case IORING_OP_POLL_REMOVE: |
54739cc6 | 8120 | return io_poll_remove_prep(req, sqe); |
8ed8d3c3 | 8121 | case IORING_OP_FSYNC: |
1155c76a | 8122 | return io_fsync_prep(req, sqe); |
8ed8d3c3 | 8123 | case IORING_OP_SYNC_FILE_RANGE: |
1155c76a | 8124 | return io_sfr_prep(req, sqe); |
03b1230c | 8125 | case IORING_OP_SENDMSG: |
fddaface | 8126 | case IORING_OP_SEND: |
bfe76559 | 8127 | return io_sendmsg_prep(req, sqe); |
03b1230c | 8128 | case IORING_OP_RECVMSG: |
fddaface | 8129 | case IORING_OP_RECV: |
bfe76559 | 8130 | return io_recvmsg_prep(req, sqe); |
f499a021 | 8131 | case IORING_OP_CONNECT: |
bfe76559 | 8132 | return io_connect_prep(req, sqe); |
2d28390a | 8133 | case IORING_OP_TIMEOUT: |
ecddc25d | 8134 | return io_timeout_prep(req, sqe); |
b29472ee | 8135 | case IORING_OP_TIMEOUT_REMOVE: |
bfe76559 | 8136 | return io_timeout_remove_prep(req, sqe); |
fbf23849 | 8137 | case IORING_OP_ASYNC_CANCEL: |
bfe76559 | 8138 | return io_async_cancel_prep(req, sqe); |
2d28390a | 8139 | case IORING_OP_LINK_TIMEOUT: |
ecddc25d | 8140 | return io_link_timeout_prep(req, sqe); |
8ed8d3c3 | 8141 | case IORING_OP_ACCEPT: |
bfe76559 | 8142 | return io_accept_prep(req, sqe); |
d63d1b5e | 8143 | case IORING_OP_FALLOCATE: |
bfe76559 | 8144 | return io_fallocate_prep(req, sqe); |
15b71abe | 8145 | case IORING_OP_OPENAT: |
bfe76559 | 8146 | return io_openat_prep(req, sqe); |
b5dba59e | 8147 | case IORING_OP_CLOSE: |
bfe76559 | 8148 | return io_close_prep(req, sqe); |
05f3fb3c | 8149 | case IORING_OP_FILES_UPDATE: |
54739cc6 | 8150 | return io_files_update_prep(req, sqe); |
eddc7ef5 | 8151 | case IORING_OP_STATX: |
bfe76559 | 8152 | return io_statx_prep(req, sqe); |
4840e418 | 8153 | case IORING_OP_FADVISE: |
bfe76559 | 8154 | return io_fadvise_prep(req, sqe); |
c1ca757b | 8155 | case IORING_OP_MADVISE: |
bfe76559 | 8156 | return io_madvise_prep(req, sqe); |
cebdb986 | 8157 | case IORING_OP_OPENAT2: |
bfe76559 | 8158 | return io_openat2_prep(req, sqe); |
3e4827b0 | 8159 | case IORING_OP_EPOLL_CTL: |
bfe76559 | 8160 | return io_epoll_ctl_prep(req, sqe); |
7d67af2c | 8161 | case IORING_OP_SPLICE: |
bfe76559 | 8162 | return io_splice_prep(req, sqe); |
ddf0322d | 8163 | case IORING_OP_PROVIDE_BUFFERS: |
bfe76559 | 8164 | return io_provide_buffers_prep(req, sqe); |
067524e9 | 8165 | case IORING_OP_REMOVE_BUFFERS: |
bfe76559 | 8166 | return io_remove_buffers_prep(req, sqe); |
f2a8d5c7 | 8167 | case IORING_OP_TEE: |
bfe76559 | 8168 | return io_tee_prep(req, sqe); |
36f4fa68 JA |
8169 | case IORING_OP_SHUTDOWN: |
8170 | return io_shutdown_prep(req, sqe); | |
80a261fd JA |
8171 | case IORING_OP_RENAMEAT: |
8172 | return io_renameat_prep(req, sqe); | |
14a1143b JA |
8173 | case IORING_OP_UNLINKAT: |
8174 | return io_unlinkat_prep(req, sqe); | |
e34a02dc DK |
8175 | case IORING_OP_MKDIRAT: |
8176 | return io_mkdirat_prep(req, sqe); | |
7a8721f8 DK |
8177 | case IORING_OP_SYMLINKAT: |
8178 | return io_symlinkat_prep(req, sqe); | |
cf30da90 DK |
8179 | case IORING_OP_LINKAT: |
8180 | return io_linkat_prep(req, sqe); | |
4f57f06c JA |
8181 | case IORING_OP_MSG_RING: |
8182 | return io_msg_ring_prep(req, sqe); | |
e9621e2b SR |
8183 | case IORING_OP_FSETXATTR: |
8184 | return io_fsetxattr_prep(req, sqe); | |
8185 | case IORING_OP_SETXATTR: | |
8186 | return io_setxattr_prep(req, sqe); | |
a56834e0 SR |
8187 | case IORING_OP_FGETXATTR: |
8188 | return io_fgetxattr_prep(req, sqe); | |
8189 | case IORING_OP_GETXATTR: | |
8190 | return io_getxattr_prep(req, sqe); | |
1374e08e JA |
8191 | case IORING_OP_SOCKET: |
8192 | return io_socket_prep(req, sqe); | |
ee692a21 JA |
8193 | case IORING_OP_URING_CMD: |
8194 | return io_uring_cmd_prep(req, sqe); | |
f67676d1 JA |
8195 | } |
8196 | ||
bfe76559 PB |
8197 | printk_once(KERN_WARNING "io_uring: unhandled opcode %d\n", |
8198 | req->opcode); | |
bd54b6fe | 8199 | return -EINVAL; |
bfe76559 PB |
8200 | } |
8201 | ||
93642ef8 | 8202 | static int io_req_prep_async(struct io_kiocb *req) |
bfe76559 | 8203 | { |
a196c78b JA |
8204 | const struct io_op_def *def = &io_op_defs[req->opcode]; |
8205 | ||
8206 | /* assign early for deferred execution for non-fixed file */ | |
8207 | if (def->needs_file && !(req->flags & REQ_F_FIXED_FILE)) | |
3a166bdb | 8208 | req->file = io_file_get_normal(req, req->cqe.fd); |
a196c78b | 8209 | if (!def->needs_async_setup) |
b7e298d2 | 8210 | return 0; |
d886e185 | 8211 | if (WARN_ON_ONCE(req_has_async_data(req))) |
b7e298d2 PB |
8212 | return -EFAULT; |
8213 | if (io_alloc_async_data(req)) | |
8214 | return -EAGAIN; | |
8215 | ||
93642ef8 PB |
8216 | switch (req->opcode) { |
8217 | case IORING_OP_READV: | |
157dc813 | 8218 | return io_readv_prep_async(req); |
93642ef8 | 8219 | case IORING_OP_WRITEV: |
157dc813 | 8220 | return io_writev_prep_async(req); |
93642ef8 | 8221 | case IORING_OP_SENDMSG: |
93642ef8 PB |
8222 | return io_sendmsg_prep_async(req); |
8223 | case IORING_OP_RECVMSG: | |
93642ef8 PB |
8224 | return io_recvmsg_prep_async(req); |
8225 | case IORING_OP_CONNECT: | |
8226 | return io_connect_prep_async(req); | |
ee692a21 JA |
8227 | case IORING_OP_URING_CMD: |
8228 | return io_uring_cmd_prep_async(req); | |
93642ef8 | 8229 | } |
b7e298d2 PB |
8230 | printk_once(KERN_WARNING "io_uring: prep_async() bad opcode %d\n", |
8231 | req->opcode); | |
8232 | return -EFAULT; | |
f67676d1 JA |
8233 | } |
8234 | ||
9cf7c104 PB |
8235 | static u32 io_get_sequence(struct io_kiocb *req) |
8236 | { | |
a3dbdf54 | 8237 | u32 seq = req->ctx->cached_sq_head; |
963c6abb | 8238 | struct io_kiocb *cur; |
9cf7c104 | 8239 | |
a3dbdf54 | 8240 | /* need original cached_sq_head, but it was increased for each req */ |
963c6abb | 8241 | io_for_each_link(cur, req) |
a3dbdf54 PB |
8242 | seq--; |
8243 | return seq; | |
9cf7c104 PB |
8244 | } |
8245 | ||
c072481d | 8246 | static __cold void io_drain_req(struct io_kiocb *req) |
de0617e4 | 8247 | { |
a197f664 | 8248 | struct io_ring_ctx *ctx = req->ctx; |
27dc8338 | 8249 | struct io_defer_entry *de; |
f67676d1 | 8250 | int ret; |
e0eb71dc | 8251 | u32 seq = io_get_sequence(req); |
3c19966d | 8252 | |
9d858b21 | 8253 | /* Still need defer if there is pending req in defer list. */ |
e302f104 | 8254 | spin_lock(&ctx->completion_lock); |
5e371265 | 8255 | if (!req_need_defer(req, seq) && list_empty_careful(&ctx->defer_list)) { |
e302f104 | 8256 | spin_unlock(&ctx->completion_lock); |
e0eb71dc | 8257 | queue: |
10c66904 | 8258 | ctx->drain_active = false; |
e0eb71dc PB |
8259 | io_req_task_queue(req); |
8260 | return; | |
10c66904 | 8261 | } |
e302f104 | 8262 | spin_unlock(&ctx->completion_lock); |
9cf7c104 | 8263 | |
b7e298d2 | 8264 | ret = io_req_prep_async(req); |
e0eb71dc PB |
8265 | if (ret) { |
8266 | fail: | |
8267 | io_req_complete_failed(req, ret); | |
8268 | return; | |
8269 | } | |
cbdcb435 | 8270 | io_prep_async_link(req); |
27dc8338 | 8271 | de = kmalloc(sizeof(*de), GFP_KERNEL); |
76cc33d7 | 8272 | if (!de) { |
1b48773f | 8273 | ret = -ENOMEM; |
e0eb71dc | 8274 | goto fail; |
76cc33d7 | 8275 | } |
2d28390a | 8276 | |
79ebeaee | 8277 | spin_lock(&ctx->completion_lock); |
9cf7c104 | 8278 | if (!req_need_defer(req, seq) && list_empty(&ctx->defer_list)) { |
79ebeaee | 8279 | spin_unlock(&ctx->completion_lock); |
27dc8338 | 8280 | kfree(de); |
e0eb71dc | 8281 | goto queue; |
de0617e4 JA |
8282 | } |
8283 | ||
cef216fc | 8284 | trace_io_uring_defer(ctx, req, req->cqe.user_data, req->opcode); |
27dc8338 | 8285 | de->req = req; |
9cf7c104 | 8286 | de->seq = seq; |
27dc8338 | 8287 | list_add_tail(&de->list, &ctx->defer_list); |
79ebeaee | 8288 | spin_unlock(&ctx->completion_lock); |
de0617e4 JA |
8289 | } |
8290 | ||
68fb8979 | 8291 | static void io_clean_op(struct io_kiocb *req) |
99bc4c38 | 8292 | { |
8197b053 PB |
8293 | if (req->flags & REQ_F_BUFFER_SELECTED) { |
8294 | spin_lock(&req->ctx->completion_lock); | |
cc3cec83 | 8295 | io_put_kbuf_comp(req); |
8197b053 PB |
8296 | spin_unlock(&req->ctx->completion_lock); |
8297 | } | |
99bc4c38 | 8298 | |
0e1b6fe3 PB |
8299 | if (req->flags & REQ_F_NEED_CLEANUP) { |
8300 | switch (req->opcode) { | |
8301 | case IORING_OP_READV: | |
8302 | case IORING_OP_READ_FIXED: | |
8303 | case IORING_OP_READ: | |
8304 | case IORING_OP_WRITEV: | |
8305 | case IORING_OP_WRITE_FIXED: | |
e8c2bc1f JA |
8306 | case IORING_OP_WRITE: { |
8307 | struct io_async_rw *io = req->async_data; | |
1dacb4df PB |
8308 | |
8309 | kfree(io->free_iovec); | |
0e1b6fe3 | 8310 | break; |
e8c2bc1f | 8311 | } |
0e1b6fe3 | 8312 | case IORING_OP_RECVMSG: |
e8c2bc1f JA |
8313 | case IORING_OP_SENDMSG: { |
8314 | struct io_async_msghdr *io = req->async_data; | |
257e84a5 PB |
8315 | |
8316 | kfree(io->free_iov); | |
0e1b6fe3 | 8317 | break; |
e8c2bc1f | 8318 | } |
f3cd4850 JA |
8319 | case IORING_OP_OPENAT: |
8320 | case IORING_OP_OPENAT2: | |
8321 | if (req->open.filename) | |
8322 | putname(req->open.filename); | |
8323 | break; | |
80a261fd JA |
8324 | case IORING_OP_RENAMEAT: |
8325 | putname(req->rename.oldpath); | |
8326 | putname(req->rename.newpath); | |
8327 | break; | |
14a1143b JA |
8328 | case IORING_OP_UNLINKAT: |
8329 | putname(req->unlink.filename); | |
8330 | break; | |
e34a02dc DK |
8331 | case IORING_OP_MKDIRAT: |
8332 | putname(req->mkdir.filename); | |
8333 | break; | |
7a8721f8 DK |
8334 | case IORING_OP_SYMLINKAT: |
8335 | putname(req->symlink.oldpath); | |
8336 | putname(req->symlink.newpath); | |
8337 | break; | |
cf30da90 DK |
8338 | case IORING_OP_LINKAT: |
8339 | putname(req->hardlink.oldpath); | |
8340 | putname(req->hardlink.newpath); | |
8341 | break; | |
1b6fe6e0 SR |
8342 | case IORING_OP_STATX: |
8343 | if (req->statx.filename) | |
8344 | putname(req->statx.filename); | |
8345 | break; | |
e9621e2b SR |
8346 | case IORING_OP_SETXATTR: |
8347 | case IORING_OP_FSETXATTR: | |
a56834e0 SR |
8348 | case IORING_OP_GETXATTR: |
8349 | case IORING_OP_FGETXATTR: | |
e9621e2b SR |
8350 | __io_xattr_finish(req); |
8351 | break; | |
0e1b6fe3 | 8352 | } |
99bc4c38 | 8353 | } |
75652a30 JA |
8354 | if ((req->flags & REQ_F_POLLED) && req->apoll) { |
8355 | kfree(req->apoll->double_poll); | |
8356 | kfree(req->apoll); | |
8357 | req->apoll = NULL; | |
8358 | } | |
9cae36a0 JA |
8359 | if (req->flags & REQ_F_INFLIGHT) { |
8360 | struct io_uring_task *tctx = req->task->io_uring; | |
8361 | ||
8362 | atomic_dec(&tctx->inflight_tracked); | |
8363 | } | |
c854357b | 8364 | if (req->flags & REQ_F_CREDS) |
b8e64b53 | 8365 | put_cred(req->creds); |
d886e185 PB |
8366 | if (req->flags & REQ_F_ASYNC_DATA) { |
8367 | kfree(req->async_data); | |
8368 | req->async_data = NULL; | |
8369 | } | |
c854357b | 8370 | req->flags &= ~IO_REQ_CLEAN_FLAGS; |
99bc4c38 PB |
8371 | } |
8372 | ||
6bf9c47a JA |
8373 | static bool io_assign_file(struct io_kiocb *req, unsigned int issue_flags) |
8374 | { | |
8375 | if (req->file || !io_op_defs[req->opcode].needs_file) | |
8376 | return true; | |
8377 | ||
8378 | if (req->flags & REQ_F_FIXED_FILE) | |
cef216fc | 8379 | req->file = io_file_get_fixed(req, req->cqe.fd, issue_flags); |
6bf9c47a | 8380 | else |
cef216fc | 8381 | req->file = io_file_get_normal(req, req->cqe.fd); |
6bf9c47a | 8382 | |
772f5e00 | 8383 | return !!req->file; |
6bf9c47a JA |
8384 | } |
8385 | ||
889fca73 | 8386 | static int io_issue_sqe(struct io_kiocb *req, unsigned int issue_flags) |
2b188cc1 | 8387 | { |
fcde59fe | 8388 | const struct io_op_def *def = &io_op_defs[req->opcode]; |
5730b27e | 8389 | const struct cred *creds = NULL; |
d625c6ee | 8390 | int ret; |
2b188cc1 | 8391 | |
70152140 JA |
8392 | if (unlikely(!io_assign_file(req, issue_flags))) |
8393 | return -EBADF; | |
8394 | ||
6878b40e | 8395 | if (unlikely((req->flags & REQ_F_CREDS) && req->creds != current_cred())) |
c10d1f98 | 8396 | creds = override_creds(req->creds); |
5730b27e | 8397 | |
fcde59fe | 8398 | if (!def->audit_skip) |
5bd2182d PM |
8399 | audit_uring_entry(req->opcode); |
8400 | ||
d625c6ee | 8401 | switch (req->opcode) { |
2b188cc1 | 8402 | case IORING_OP_NOP: |
889fca73 | 8403 | ret = io_nop(req, issue_flags); |
2b188cc1 JA |
8404 | break; |
8405 | case IORING_OP_READV: | |
edafccee | 8406 | case IORING_OP_READ_FIXED: |
3a6820f2 | 8407 | case IORING_OP_READ: |
889fca73 | 8408 | ret = io_read(req, issue_flags); |
edafccee | 8409 | break; |
3529d8c2 | 8410 | case IORING_OP_WRITEV: |
edafccee | 8411 | case IORING_OP_WRITE_FIXED: |
3a6820f2 | 8412 | case IORING_OP_WRITE: |
889fca73 | 8413 | ret = io_write(req, issue_flags); |
2b188cc1 | 8414 | break; |
c992fe29 | 8415 | case IORING_OP_FSYNC: |
45d189c6 | 8416 | ret = io_fsync(req, issue_flags); |
c992fe29 | 8417 | break; |
221c5eb2 | 8418 | case IORING_OP_POLL_ADD: |
61e98203 | 8419 | ret = io_poll_add(req, issue_flags); |
221c5eb2 JA |
8420 | break; |
8421 | case IORING_OP_POLL_REMOVE: | |
54739cc6 | 8422 | ret = io_poll_remove(req, issue_flags); |
221c5eb2 | 8423 | break; |
5d17b4a4 | 8424 | case IORING_OP_SYNC_FILE_RANGE: |
45d189c6 | 8425 | ret = io_sync_file_range(req, issue_flags); |
5d17b4a4 | 8426 | break; |
0fa03c62 | 8427 | case IORING_OP_SENDMSG: |
889fca73 | 8428 | ret = io_sendmsg(req, issue_flags); |
062d04d7 | 8429 | break; |
fddaface | 8430 | case IORING_OP_SEND: |
889fca73 | 8431 | ret = io_send(req, issue_flags); |
0fa03c62 | 8432 | break; |
aa1fa28f | 8433 | case IORING_OP_RECVMSG: |
889fca73 | 8434 | ret = io_recvmsg(req, issue_flags); |
062d04d7 | 8435 | break; |
fddaface | 8436 | case IORING_OP_RECV: |
889fca73 | 8437 | ret = io_recv(req, issue_flags); |
aa1fa28f | 8438 | break; |
5262f567 | 8439 | case IORING_OP_TIMEOUT: |
61e98203 | 8440 | ret = io_timeout(req, issue_flags); |
5262f567 | 8441 | break; |
11365043 | 8442 | case IORING_OP_TIMEOUT_REMOVE: |
61e98203 | 8443 | ret = io_timeout_remove(req, issue_flags); |
11365043 | 8444 | break; |
17f2fe35 | 8445 | case IORING_OP_ACCEPT: |
889fca73 | 8446 | ret = io_accept(req, issue_flags); |
17f2fe35 | 8447 | break; |
f8e85cf2 | 8448 | case IORING_OP_CONNECT: |
889fca73 | 8449 | ret = io_connect(req, issue_flags); |
f8e85cf2 | 8450 | break; |
62755e35 | 8451 | case IORING_OP_ASYNC_CANCEL: |
61e98203 | 8452 | ret = io_async_cancel(req, issue_flags); |
62755e35 | 8453 | break; |
d63d1b5e | 8454 | case IORING_OP_FALLOCATE: |
45d189c6 | 8455 | ret = io_fallocate(req, issue_flags); |
d63d1b5e | 8456 | break; |
15b71abe | 8457 | case IORING_OP_OPENAT: |
45d189c6 | 8458 | ret = io_openat(req, issue_flags); |
15b71abe | 8459 | break; |
b5dba59e | 8460 | case IORING_OP_CLOSE: |
889fca73 | 8461 | ret = io_close(req, issue_flags); |
b5dba59e | 8462 | break; |
05f3fb3c | 8463 | case IORING_OP_FILES_UPDATE: |
889fca73 | 8464 | ret = io_files_update(req, issue_flags); |
05f3fb3c | 8465 | break; |
eddc7ef5 | 8466 | case IORING_OP_STATX: |
45d189c6 | 8467 | ret = io_statx(req, issue_flags); |
eddc7ef5 | 8468 | break; |
4840e418 | 8469 | case IORING_OP_FADVISE: |
45d189c6 | 8470 | ret = io_fadvise(req, issue_flags); |
4840e418 | 8471 | break; |
c1ca757b | 8472 | case IORING_OP_MADVISE: |
45d189c6 | 8473 | ret = io_madvise(req, issue_flags); |
c1ca757b | 8474 | break; |
cebdb986 | 8475 | case IORING_OP_OPENAT2: |
45d189c6 | 8476 | ret = io_openat2(req, issue_flags); |
cebdb986 | 8477 | break; |
3e4827b0 | 8478 | case IORING_OP_EPOLL_CTL: |
889fca73 | 8479 | ret = io_epoll_ctl(req, issue_flags); |
3e4827b0 | 8480 | break; |
7d67af2c | 8481 | case IORING_OP_SPLICE: |
45d189c6 | 8482 | ret = io_splice(req, issue_flags); |
7d67af2c | 8483 | break; |
ddf0322d | 8484 | case IORING_OP_PROVIDE_BUFFERS: |
889fca73 | 8485 | ret = io_provide_buffers(req, issue_flags); |
ddf0322d | 8486 | break; |
067524e9 | 8487 | case IORING_OP_REMOVE_BUFFERS: |
889fca73 | 8488 | ret = io_remove_buffers(req, issue_flags); |
3e4827b0 | 8489 | break; |
f2a8d5c7 | 8490 | case IORING_OP_TEE: |
45d189c6 | 8491 | ret = io_tee(req, issue_flags); |
f2a8d5c7 | 8492 | break; |
36f4fa68 | 8493 | case IORING_OP_SHUTDOWN: |
45d189c6 | 8494 | ret = io_shutdown(req, issue_flags); |
36f4fa68 | 8495 | break; |
80a261fd | 8496 | case IORING_OP_RENAMEAT: |
45d189c6 | 8497 | ret = io_renameat(req, issue_flags); |
80a261fd | 8498 | break; |
14a1143b | 8499 | case IORING_OP_UNLINKAT: |
45d189c6 | 8500 | ret = io_unlinkat(req, issue_flags); |
14a1143b | 8501 | break; |
e34a02dc DK |
8502 | case IORING_OP_MKDIRAT: |
8503 | ret = io_mkdirat(req, issue_flags); | |
8504 | break; | |
7a8721f8 DK |
8505 | case IORING_OP_SYMLINKAT: |
8506 | ret = io_symlinkat(req, issue_flags); | |
8507 | break; | |
cf30da90 DK |
8508 | case IORING_OP_LINKAT: |
8509 | ret = io_linkat(req, issue_flags); | |
8510 | break; | |
4f57f06c JA |
8511 | case IORING_OP_MSG_RING: |
8512 | ret = io_msg_ring(req, issue_flags); | |
8513 | break; | |
e9621e2b SR |
8514 | case IORING_OP_FSETXATTR: |
8515 | ret = io_fsetxattr(req, issue_flags); | |
8516 | break; | |
8517 | case IORING_OP_SETXATTR: | |
8518 | ret = io_setxattr(req, issue_flags); | |
8519 | break; | |
a56834e0 SR |
8520 | case IORING_OP_FGETXATTR: |
8521 | ret = io_fgetxattr(req, issue_flags); | |
8522 | break; | |
8523 | case IORING_OP_GETXATTR: | |
8524 | ret = io_getxattr(req, issue_flags); | |
8525 | break; | |
1374e08e JA |
8526 | case IORING_OP_SOCKET: |
8527 | ret = io_socket(req, issue_flags); | |
8528 | break; | |
ee692a21 JA |
8529 | case IORING_OP_URING_CMD: |
8530 | ret = io_uring_cmd(req, issue_flags); | |
8531 | break; | |
2b188cc1 JA |
8532 | default: |
8533 | ret = -EINVAL; | |
8534 | break; | |
8535 | } | |
8536 | ||
fcde59fe | 8537 | if (!def->audit_skip) |
5bd2182d PM |
8538 | audit_uring_exit(!ret, ret); |
8539 | ||
5730b27e JA |
8540 | if (creds) |
8541 | revert_creds(creds); | |
def596e9 JA |
8542 | if (ret) |
8543 | return ret; | |
b532576e | 8544 | /* If the op doesn't have a file, we're not polling for it */ |
9983028e | 8545 | if ((req->ctx->flags & IORING_SETUP_IOPOLL) && req->file) |
9882131c | 8546 | io_iopoll_req_issued(req, issue_flags); |
def596e9 JA |
8547 | |
8548 | return 0; | |
2b188cc1 JA |
8549 | } |
8550 | ||
ebc11b6c PB |
8551 | static struct io_wq_work *io_wq_free_work(struct io_wq_work *work) |
8552 | { | |
8553 | struct io_kiocb *req = container_of(work, struct io_kiocb, work); | |
8554 | ||
8555 | req = io_put_req_find_next(req); | |
8556 | return req ? &req->work : NULL; | |
8557 | } | |
8558 | ||
5280f7e5 | 8559 | static void io_wq_submit_work(struct io_wq_work *work) |
2b188cc1 JA |
8560 | { |
8561 | struct io_kiocb *req = container_of(work, struct io_kiocb, work); | |
6bf9c47a | 8562 | const struct io_op_def *def = &io_op_defs[req->opcode]; |
d01905db PB |
8563 | unsigned int issue_flags = IO_URING_F_UNLOCKED; |
8564 | bool needs_poll = false; | |
6bf9c47a | 8565 | int ret = 0, err = -ECANCELED; |
2b188cc1 | 8566 | |
48dcd38d PB |
8567 | /* one will be dropped by ->io_free_work() after returning to io-wq */ |
8568 | if (!(req->flags & REQ_F_REFCOUNT)) | |
8569 | __io_req_set_refcount(req, 2); | |
8570 | else | |
8571 | req_ref_get(req); | |
5d5901a3 | 8572 | |
cb2d344c | 8573 | io_arm_ltimeout(req); |
6bf9c47a | 8574 | |
dadebc35 | 8575 | /* either cancelled or io-wq is dying, so don't touch tctx->iowq */ |
d01905db | 8576 | if (work->flags & IO_WQ_WORK_CANCEL) { |
0f8da75b | 8577 | fail: |
6bf9c47a | 8578 | io_req_task_queue_fail(req, err); |
d01905db PB |
8579 | return; |
8580 | } | |
0f8da75b PB |
8581 | if (!io_assign_file(req, issue_flags)) { |
8582 | err = -EBADF; | |
8583 | work->flags |= IO_WQ_WORK_CANCEL; | |
8584 | goto fail; | |
8585 | } | |
31b51510 | 8586 | |
d01905db | 8587 | if (req->flags & REQ_F_FORCE_ASYNC) { |
afb7f56f PB |
8588 | bool opcode_poll = def->pollin || def->pollout; |
8589 | ||
8590 | if (opcode_poll && file_can_poll(req->file)) { | |
8591 | needs_poll = true; | |
d01905db | 8592 | issue_flags |= IO_URING_F_NONBLOCK; |
afb7f56f | 8593 | } |
561fb04a | 8594 | } |
31b51510 | 8595 | |
d01905db PB |
8596 | do { |
8597 | ret = io_issue_sqe(req, issue_flags); | |
8598 | if (ret != -EAGAIN) | |
8599 | break; | |
8600 | /* | |
8601 | * We can get EAGAIN for iopolled IO even though we're | |
8602 | * forcing a sync submission from here, since we can't | |
8603 | * wait for request slots on the block side. | |
8604 | */ | |
8605 | if (!needs_poll) { | |
e0deb6a0 PB |
8606 | if (!(req->ctx->flags & IORING_SETUP_IOPOLL)) |
8607 | break; | |
d01905db PB |
8608 | cond_resched(); |
8609 | continue; | |
90fa0288 HX |
8610 | } |
8611 | ||
4d9237e3 | 8612 | if (io_arm_poll_handler(req, issue_flags) == IO_APOLL_OK) |
d01905db PB |
8613 | return; |
8614 | /* aborted or ready, in either case retry blocking */ | |
8615 | needs_poll = false; | |
8616 | issue_flags &= ~IO_URING_F_NONBLOCK; | |
8617 | } while (1); | |
31b51510 | 8618 | |
a3df7698 | 8619 | /* avoid locking problems by failing it from a clean context */ |
5d5901a3 | 8620 | if (ret) |
a3df7698 | 8621 | io_req_task_queue_fail(req, ret); |
2b188cc1 JA |
8622 | } |
8623 | ||
aeca241b | 8624 | static inline struct io_fixed_file *io_fixed_file_slot(struct io_file_table *table, |
042b0d85 | 8625 | unsigned i) |
65e19f54 | 8626 | { |
042b0d85 | 8627 | return &table->files[i]; |
dafecf19 PB |
8628 | } |
8629 | ||
65e19f54 JA |
8630 | static inline struct file *io_file_from_index(struct io_ring_ctx *ctx, |
8631 | int index) | |
8632 | { | |
aeca241b | 8633 | struct io_fixed_file *slot = io_fixed_file_slot(&ctx->file_table, index); |
65e19f54 | 8634 | |
a04b0ac0 | 8635 | return (struct file *) (slot->file_ptr & FFS_MASK); |
65e19f54 JA |
8636 | } |
8637 | ||
a04b0ac0 | 8638 | static void io_fixed_file_set(struct io_fixed_file *file_slot, struct file *file) |
9a321c98 PB |
8639 | { |
8640 | unsigned long file_ptr = (unsigned long) file; | |
8641 | ||
88459b50 | 8642 | file_ptr |= io_file_get_flags(file); |
a04b0ac0 | 8643 | file_slot->file_ptr = file_ptr; |
65e19f54 JA |
8644 | } |
8645 | ||
5106dd6e JA |
8646 | static inline struct file *io_file_get_fixed(struct io_kiocb *req, int fd, |
8647 | unsigned int issue_flags) | |
09bb8394 | 8648 | { |
5106dd6e JA |
8649 | struct io_ring_ctx *ctx = req->ctx; |
8650 | struct file *file = NULL; | |
ac177053 | 8651 | unsigned long file_ptr; |
09bb8394 | 8652 | |
93f052cb | 8653 | io_ring_submit_lock(ctx, issue_flags); |
5106dd6e | 8654 | |
ac177053 | 8655 | if (unlikely((unsigned int)fd >= ctx->nr_user_files)) |
5106dd6e | 8656 | goto out; |
ac177053 PB |
8657 | fd = array_index_nospec(fd, ctx->nr_user_files); |
8658 | file_ptr = io_fixed_file_slot(&ctx->file_table, fd)->file_ptr; | |
8659 | file = (struct file *) (file_ptr & FFS_MASK); | |
8660 | file_ptr &= ~FFS_MASK; | |
8661 | /* mask in overlapping REQ_F and FFS bits */ | |
35645ac3 | 8662 | req->flags |= (file_ptr << REQ_F_SUPPORT_NOWAIT_BIT); |
5106dd6e | 8663 | io_req_set_rsrc_node(req, ctx, 0); |
d78bd8ad | 8664 | WARN_ON_ONCE(file && !test_bit(fd, ctx->file_table.bitmap)); |
5106dd6e | 8665 | out: |
93f052cb | 8666 | io_ring_submit_unlock(ctx, issue_flags); |
ac177053 PB |
8667 | return file; |
8668 | } | |
d44f554e | 8669 | |
5106dd6e | 8670 | static struct file *io_file_get_normal(struct io_kiocb *req, int fd) |
ac177053 | 8671 | { |
62906e89 | 8672 | struct file *file = fget(fd); |
ac177053 | 8673 | |
cef216fc | 8674 | trace_io_uring_file_get(req->ctx, req, req->cqe.user_data, fd); |
09bb8394 | 8675 | |
ac177053 | 8676 | /* we don't allow fixed io_uring files */ |
d5361233 | 8677 | if (file && file->f_op == &io_uring_fops) |
9cae36a0 | 8678 | io_req_track_inflight(req); |
8371adf5 | 8679 | return file; |
09bb8394 JA |
8680 | } |
8681 | ||
f237c30a | 8682 | static void io_req_task_link_timeout(struct io_kiocb *req, bool *locked) |
89b263f6 JA |
8683 | { |
8684 | struct io_kiocb *prev = req->timeout.prev; | |
617a8948 | 8685 | int ret = -ENOENT; |
89b263f6 JA |
8686 | |
8687 | if (prev) { | |
b21432b4 JA |
8688 | if (!(req->task->flags & PF_EXITING)) { |
8689 | struct io_cancel_data cd = { | |
8690 | .ctx = req->ctx, | |
8691 | .data = prev->cqe.user_data, | |
8692 | }; | |
8693 | ||
8694 | ret = io_try_cancel(req, &cd); | |
8695 | } | |
505657bc | 8696 | io_req_complete_post(req, ret ?: -ETIME, 0); |
89b263f6 | 8697 | io_put_req(prev); |
89b263f6 JA |
8698 | } else { |
8699 | io_req_complete_post(req, -ETIME, 0); | |
8700 | } | |
8701 | } | |
8702 | ||
2665abfd | 8703 | static enum hrtimer_restart io_link_timeout_fn(struct hrtimer *timer) |
2b188cc1 | 8704 | { |
ad8a48ac JA |
8705 | struct io_timeout_data *data = container_of(timer, |
8706 | struct io_timeout_data, timer); | |
90cd7e42 | 8707 | struct io_kiocb *prev, *req = data->req; |
2665abfd | 8708 | struct io_ring_ctx *ctx = req->ctx; |
2665abfd | 8709 | unsigned long flags; |
2665abfd | 8710 | |
89b263f6 | 8711 | spin_lock_irqsave(&ctx->timeout_lock, flags); |
90cd7e42 PB |
8712 | prev = req->timeout.head; |
8713 | req->timeout.head = NULL; | |
2665abfd JA |
8714 | |
8715 | /* | |
8716 | * We don't expect the list to be empty, that will only happen if we | |
8717 | * race with the completion of the linked work. | |
8718 | */ | |
447c19f3 | 8719 | if (prev) { |
f2f87370 | 8720 | io_remove_next_linked(prev); |
447c19f3 PB |
8721 | if (!req_ref_inc_not_zero(prev)) |
8722 | prev = NULL; | |
8723 | } | |
ef9dd637 | 8724 | list_del(&req->timeout.list); |
89b263f6 JA |
8725 | req->timeout.prev = prev; |
8726 | spin_unlock_irqrestore(&ctx->timeout_lock, flags); | |
2665abfd | 8727 | |
89b263f6 | 8728 | req->io_task_work.func = io_req_task_link_timeout; |
3fe07bcd | 8729 | io_req_task_work_add(req); |
2665abfd JA |
8730 | return HRTIMER_NORESTART; |
8731 | } | |
8732 | ||
de968c18 | 8733 | static void io_queue_linked_timeout(struct io_kiocb *req) |
2665abfd | 8734 | { |
de968c18 PB |
8735 | struct io_ring_ctx *ctx = req->ctx; |
8736 | ||
89b263f6 | 8737 | spin_lock_irq(&ctx->timeout_lock); |
76a46e06 | 8738 | /* |
f2f87370 PB |
8739 | * If the back reference is NULL, then our linked request finished |
8740 | * before we got a chance to setup the timer | |
76a46e06 | 8741 | */ |
90cd7e42 | 8742 | if (req->timeout.head) { |
e8c2bc1f | 8743 | struct io_timeout_data *data = req->async_data; |
94ae5e77 | 8744 | |
ad8a48ac JA |
8745 | data->timer.function = io_link_timeout_fn; |
8746 | hrtimer_start(&data->timer, timespec64_to_ktime(data->ts), | |
8747 | data->mode); | |
ef9dd637 | 8748 | list_add_tail(&req->timeout.list, &ctx->ltimeout_list); |
2665abfd | 8749 | } |
89b263f6 | 8750 | spin_unlock_irq(&ctx->timeout_lock); |
2665abfd | 8751 | /* drop submission reference */ |
76a46e06 JA |
8752 | io_put_req(req); |
8753 | } | |
2665abfd | 8754 | |
7bfa9bad | 8755 | static void io_queue_async(struct io_kiocb *req, int ret) |
d475a9a6 PB |
8756 | __must_hold(&req->ctx->uring_lock) |
8757 | { | |
7bfa9bad PB |
8758 | struct io_kiocb *linked_timeout; |
8759 | ||
8760 | if (ret != -EAGAIN || (req->flags & REQ_F_NOWAIT)) { | |
8761 | io_req_complete_failed(req, ret); | |
8762 | return; | |
8763 | } | |
8764 | ||
8765 | linked_timeout = io_prep_linked_timeout(req); | |
d475a9a6 | 8766 | |
4d9237e3 | 8767 | switch (io_arm_poll_handler(req, 0)) { |
d475a9a6 | 8768 | case IO_APOLL_READY: |
d475a9a6 PB |
8769 | io_req_task_queue(req); |
8770 | break; | |
8771 | case IO_APOLL_ABORTED: | |
8772 | /* | |
8773 | * Queued up for async execution, worker will release | |
8774 | * submit reference when the iocb is actually submitted. | |
8775 | */ | |
77955efb | 8776 | io_queue_iowq(req, NULL); |
d475a9a6 | 8777 | break; |
b1c62645 | 8778 | case IO_APOLL_OK: |
b1c62645 | 8779 | break; |
d475a9a6 PB |
8780 | } |
8781 | ||
8782 | if (linked_timeout) | |
8783 | io_queue_linked_timeout(linked_timeout); | |
8784 | } | |
8785 | ||
cbc2e203 | 8786 | static inline void io_queue_sqe(struct io_kiocb *req) |
282cdc86 | 8787 | __must_hold(&req->ctx->uring_lock) |
2b188cc1 | 8788 | { |
e0c5c576 | 8789 | int ret; |
2b188cc1 | 8790 | |
c5eef2b9 | 8791 | ret = io_issue_sqe(req, IO_URING_F_NONBLOCK|IO_URING_F_COMPLETE_DEFER); |
193155c8 | 8792 | |
fff4e40e PB |
8793 | if (req->flags & REQ_F_COMPLETE_INLINE) { |
8794 | io_req_add_compl_list(req); | |
d9f9d284 | 8795 | return; |
fff4e40e | 8796 | } |
491381ce JA |
8797 | /* |
8798 | * We async punt it if the file wasn't marked NOWAIT, or if the file | |
8799 | * doesn't support non-blocking read/write attempts | |
8800 | */ | |
7bfa9bad | 8801 | if (likely(!ret)) |
cb2d344c | 8802 | io_arm_ltimeout(req); |
7bfa9bad PB |
8803 | else |
8804 | io_queue_async(req, ret); | |
2b188cc1 JA |
8805 | } |
8806 | ||
4652fe3f | 8807 | static void io_queue_sqe_fallback(struct io_kiocb *req) |
282cdc86 | 8808 | __must_hold(&req->ctx->uring_lock) |
4fe2c963 | 8809 | { |
17b147f6 PB |
8810 | if (unlikely(req->flags & REQ_F_FAIL)) { |
8811 | /* | |
8812 | * We don't submit, fail them all, for that replace hardlinks | |
8813 | * with normal links. Extra REQ_F_LINK is tolerated. | |
8814 | */ | |
8815 | req->flags &= ~REQ_F_HARDLINK; | |
8816 | req->flags |= REQ_F_LINK; | |
8817 | io_req_complete_failed(req, req->cqe.res); | |
e0eb71dc PB |
8818 | } else if (unlikely(req->ctx->drain_active)) { |
8819 | io_drain_req(req); | |
76cc33d7 PB |
8820 | } else { |
8821 | int ret = io_req_prep_async(req); | |
8822 | ||
8823 | if (unlikely(ret)) | |
8824 | io_req_complete_failed(req, ret); | |
8825 | else | |
77955efb | 8826 | io_queue_iowq(req, NULL); |
ce35a47a | 8827 | } |
4fe2c963 JL |
8828 | } |
8829 | ||
b16fed66 PB |
8830 | /* |
8831 | * Check SQE restrictions (opcode and flags). | |
8832 | * | |
8833 | * Returns 'true' if SQE is allowed, 'false' otherwise. | |
8834 | */ | |
8835 | static inline bool io_check_restriction(struct io_ring_ctx *ctx, | |
8836 | struct io_kiocb *req, | |
8837 | unsigned int sqe_flags) | |
4fe2c963 | 8838 | { |
b16fed66 PB |
8839 | if (!test_bit(req->opcode, ctx->restrictions.sqe_op)) |
8840 | return false; | |
8841 | ||
8842 | if ((sqe_flags & ctx->restrictions.sqe_flags_required) != | |
8843 | ctx->restrictions.sqe_flags_required) | |
8844 | return false; | |
8845 | ||
8846 | if (sqe_flags & ~(ctx->restrictions.sqe_flags_allowed | | |
8847 | ctx->restrictions.sqe_flags_required)) | |
8848 | return false; | |
8849 | ||
8850 | return true; | |
4fe2c963 JL |
8851 | } |
8852 | ||
22b2ca31 PB |
8853 | static void io_init_req_drain(struct io_kiocb *req) |
8854 | { | |
8855 | struct io_ring_ctx *ctx = req->ctx; | |
8856 | struct io_kiocb *head = ctx->submit_state.link.head; | |
8857 | ||
8858 | ctx->drain_active = true; | |
8859 | if (head) { | |
8860 | /* | |
8861 | * If we need to drain a request in the middle of a link, drain | |
8862 | * the head request and the next request/link after the current | |
8863 | * link. Considering sequential execution of links, | |
b6c7db32 | 8864 | * REQ_F_IO_DRAIN will be maintained for every request of our |
22b2ca31 PB |
8865 | * link. |
8866 | */ | |
b6c7db32 | 8867 | head->flags |= REQ_F_IO_DRAIN | REQ_F_FORCE_ASYNC; |
22b2ca31 PB |
8868 | ctx->drain_next = true; |
8869 | } | |
8870 | } | |
8871 | ||
b16fed66 PB |
8872 | static int io_init_req(struct io_ring_ctx *ctx, struct io_kiocb *req, |
8873 | const struct io_uring_sqe *sqe) | |
282cdc86 | 8874 | __must_hold(&ctx->uring_lock) |
b16fed66 | 8875 | { |
fcde59fe | 8876 | const struct io_op_def *def; |
b16fed66 | 8877 | unsigned int sqe_flags; |
fc0ae024 | 8878 | int personality; |
4a04d1d1 | 8879 | u8 opcode; |
b16fed66 | 8880 | |
864ea921 | 8881 | /* req is partially pre-initialised, see io_preinit_req() */ |
4a04d1d1 | 8882 | req->opcode = opcode = READ_ONCE(sqe->opcode); |
b16fed66 PB |
8883 | /* same numerical values with corresponding REQ_F_*, safe to copy */ |
8884 | req->flags = sqe_flags = READ_ONCE(sqe->flags); | |
cef216fc | 8885 | req->cqe.user_data = READ_ONCE(sqe->user_data); |
b16fed66 | 8886 | req->file = NULL; |
c1bdf8ed | 8887 | req->rsrc_node = NULL; |
b16fed66 | 8888 | req->task = current; |
b16fed66 | 8889 | |
4a04d1d1 PB |
8890 | if (unlikely(opcode >= IORING_OP_LAST)) { |
8891 | req->opcode = 0; | |
b16fed66 | 8892 | return -EINVAL; |
4a04d1d1 | 8893 | } |
fcde59fe | 8894 | def = &io_op_defs[opcode]; |
68fe256a PB |
8895 | if (unlikely(sqe_flags & ~SQE_COMMON_FLAGS)) { |
8896 | /* enforce forwards compatibility on users */ | |
8897 | if (sqe_flags & ~SQE_VALID_FLAGS) | |
8898 | return -EINVAL; | |
4e906702 | 8899 | if (sqe_flags & IOSQE_BUFFER_SELECT) { |
fcde59fe | 8900 | if (!def->buffer_select) |
4e906702 JA |
8901 | return -EOPNOTSUPP; |
8902 | req->buf_index = READ_ONCE(sqe->buf_group); | |
8903 | } | |
5562a8d7 PB |
8904 | if (sqe_flags & IOSQE_CQE_SKIP_SUCCESS) |
8905 | ctx->drain_disabled = true; | |
8906 | if (sqe_flags & IOSQE_IO_DRAIN) { | |
8907 | if (ctx->drain_disabled) | |
8908 | return -EOPNOTSUPP; | |
22b2ca31 | 8909 | io_init_req_drain(req); |
5562a8d7 | 8910 | } |
2a56a9bd PB |
8911 | } |
8912 | if (unlikely(ctx->restricted || ctx->drain_active || ctx->drain_next)) { | |
8913 | if (ctx->restricted && !io_check_restriction(ctx, req, sqe_flags)) | |
8914 | return -EACCES; | |
8915 | /* knock it to the slow queue path, will be drained there */ | |
8916 | if (ctx->drain_active) | |
8917 | req->flags |= REQ_F_FORCE_ASYNC; | |
8918 | /* if there is no link, we're at "next" request and need to drain */ | |
8919 | if (unlikely(ctx->drain_next) && !ctx->submit_state.link.head) { | |
8920 | ctx->drain_next = false; | |
8921 | ctx->drain_active = true; | |
b6c7db32 | 8922 | req->flags |= REQ_F_IO_DRAIN | REQ_F_FORCE_ASYNC; |
2a56a9bd | 8923 | } |
68fe256a | 8924 | } |
b16fed66 | 8925 | |
fcde59fe | 8926 | if (!def->ioprio && sqe->ioprio) |
73911426 | 8927 | return -EINVAL; |
fcde59fe | 8928 | if (!def->iopoll && (ctx->flags & IORING_SETUP_IOPOLL)) |
73911426 JA |
8929 | return -EINVAL; |
8930 | ||
fcde59fe | 8931 | if (def->needs_file) { |
6d63416d PB |
8932 | struct io_submit_state *state = &ctx->submit_state; |
8933 | ||
cef216fc | 8934 | req->cqe.fd = READ_ONCE(sqe->fd); |
6bf9c47a | 8935 | |
6d63416d PB |
8936 | /* |
8937 | * Plug now if we have more than 2 IO left after this, and the | |
8938 | * target is potentially a read/write to block based storage. | |
8939 | */ | |
fcde59fe | 8940 | if (state->need_plug && def->plug) { |
6d63416d PB |
8941 | state->plug_started = true; |
8942 | state->need_plug = false; | |
5ca7a8b3 | 8943 | blk_start_plug_nr_ios(&state->plug, state->submit_nr); |
6d63416d | 8944 | } |
b16fed66 | 8945 | } |
863e0560 | 8946 | |
003e8dcc JA |
8947 | personality = READ_ONCE(sqe->personality); |
8948 | if (personality) { | |
cdab10bf LT |
8949 | int ret; |
8950 | ||
c10d1f98 PB |
8951 | req->creds = xa_load(&ctx->personalities, personality); |
8952 | if (!req->creds) | |
003e8dcc | 8953 | return -EINVAL; |
c10d1f98 | 8954 | get_cred(req->creds); |
cdc1404a PM |
8955 | ret = security_uring_override_creds(req->creds); |
8956 | if (ret) { | |
8957 | put_cred(req->creds); | |
8958 | return ret; | |
8959 | } | |
b8e64b53 | 8960 | req->flags |= REQ_F_CREDS; |
003e8dcc | 8961 | } |
b16fed66 | 8962 | |
fc0ae024 | 8963 | return io_req_prep(req, sqe); |
b16fed66 PB |
8964 | } |
8965 | ||
df3becde PB |
8966 | static __cold int io_submit_fail_init(const struct io_uring_sqe *sqe, |
8967 | struct io_kiocb *req, int ret) | |
8968 | { | |
8969 | struct io_ring_ctx *ctx = req->ctx; | |
8970 | struct io_submit_link *link = &ctx->submit_state.link; | |
8971 | struct io_kiocb *head = link->head; | |
8972 | ||
8973 | trace_io_uring_req_failed(sqe, ctx, req, ret); | |
8974 | ||
8975 | /* | |
8976 | * Avoid breaking links in the middle as it renders links with SQPOLL | |
8977 | * unusable. Instead of failing eagerly, continue assembling the link if | |
8978 | * applicable and mark the head with REQ_F_FAIL. The link flushing code | |
8979 | * should find the flag and handle the rest. | |
8980 | */ | |
8981 | req_fail_link_node(req, ret); | |
8982 | if (head && !(head->flags & REQ_F_FAIL)) | |
8983 | req_fail_link_node(head, -ECANCELED); | |
8984 | ||
8985 | if (!(req->flags & IO_REQ_LINK_FLAGS)) { | |
8986 | if (head) { | |
8987 | link->last->link = req; | |
8988 | link->head = NULL; | |
8989 | req = head; | |
8990 | } | |
8991 | io_queue_sqe_fallback(req); | |
8992 | return ret; | |
8993 | } | |
8994 | ||
8995 | if (head) | |
8996 | link->last->link = req; | |
8997 | else | |
8998 | link->head = req; | |
8999 | link->last = req; | |
9000 | return 0; | |
9001 | } | |
9002 | ||
9003 | static inline int io_submit_sqe(struct io_ring_ctx *ctx, struct io_kiocb *req, | |
a1ab7b35 | 9004 | const struct io_uring_sqe *sqe) |
282cdc86 | 9005 | __must_hold(&ctx->uring_lock) |
9e645e11 | 9006 | { |
a1ab7b35 | 9007 | struct io_submit_link *link = &ctx->submit_state.link; |
ef4ff581 | 9008 | int ret; |
9e645e11 | 9009 | |
a6b8cadc | 9010 | ret = io_init_req(ctx, req, sqe); |
df3becde PB |
9011 | if (unlikely(ret)) |
9012 | return io_submit_fail_init(sqe, req, ret); | |
441b8a78 | 9013 | |
be7053b7 | 9014 | /* don't need @sqe from now on */ |
cef216fc | 9015 | trace_io_uring_submit_sqe(ctx, req, req->cqe.user_data, req->opcode, |
236daeae OL |
9016 | req->flags, true, |
9017 | ctx->flags & IORING_SETUP_SQPOLL); | |
a6b8cadc | 9018 | |
9e645e11 JA |
9019 | /* |
9020 | * If we already have a head request, queue this one for async | |
9021 | * submittal once the head completes. If we don't have a head but | |
9022 | * IOSQE_IO_LINK is set in the sqe, start a new head. This one will be | |
9023 | * submitted sync once the chain is complete. If none of those | |
9024 | * conditions are true (normal request), then just queue it. | |
9025 | */ | |
924a07e4 | 9026 | if (unlikely(link->head)) { |
df3becde PB |
9027 | ret = io_req_prep_async(req); |
9028 | if (unlikely(ret)) | |
9029 | return io_submit_fail_init(sqe, req, ret); | |
9030 | ||
9031 | trace_io_uring_link(ctx, req, link->head); | |
f2f87370 | 9032 | link->last->link = req; |
863e0560 | 9033 | link->last = req; |
32fe525b | 9034 | |
da1a08c5 | 9035 | if (req->flags & IO_REQ_LINK_FLAGS) |
f15a3431 | 9036 | return 0; |
df3becde PB |
9037 | /* last request of the link, flush it */ |
9038 | req = link->head; | |
f15a3431 | 9039 | link->head = NULL; |
924a07e4 PB |
9040 | if (req->flags & (REQ_F_FORCE_ASYNC | REQ_F_FAIL)) |
9041 | goto fallback; | |
9042 | ||
9043 | } else if (unlikely(req->flags & (IO_REQ_LINK_FLAGS | | |
9044 | REQ_F_FORCE_ASYNC | REQ_F_FAIL))) { | |
9045 | if (req->flags & IO_REQ_LINK_FLAGS) { | |
9046 | link->head = req; | |
9047 | link->last = req; | |
9048 | } else { | |
9049 | fallback: | |
9050 | io_queue_sqe_fallback(req); | |
9051 | } | |
f15a3431 | 9052 | return 0; |
9e645e11 | 9053 | } |
2e6e1fde | 9054 | |
f15a3431 | 9055 | io_queue_sqe(req); |
1d4240cc | 9056 | return 0; |
9e645e11 JA |
9057 | } |
9058 | ||
9a56a232 JA |
9059 | /* |
9060 | * Batched submission is done, ensure local IO is flushed out. | |
9061 | */ | |
553deffd | 9062 | static void io_submit_state_end(struct io_ring_ctx *ctx) |
9a56a232 | 9063 | { |
553deffd PB |
9064 | struct io_submit_state *state = &ctx->submit_state; |
9065 | ||
e126391c PB |
9066 | if (unlikely(state->link.head)) |
9067 | io_queue_sqe_fallback(state->link.head); | |
553deffd | 9068 | /* flush only after queuing links as they can generate completions */ |
c450178d | 9069 | io_submit_flush_completions(ctx); |
27926b68 JA |
9070 | if (state->plug_started) |
9071 | blk_finish_plug(&state->plug); | |
9a56a232 JA |
9072 | } |
9073 | ||
9074 | /* | |
9075 | * Start submission side cache. | |
9076 | */ | |
9077 | static void io_submit_state_start(struct io_submit_state *state, | |
ba88ff11 | 9078 | unsigned int max_ios) |
9a56a232 | 9079 | { |
27926b68 | 9080 | state->plug_started = false; |
4b628aeb | 9081 | state->need_plug = max_ios > 2; |
5ca7a8b3 | 9082 | state->submit_nr = max_ios; |
a1ab7b35 PB |
9083 | /* set only head, no need to init link_last in advance */ |
9084 | state->link.head = NULL; | |
9a56a232 JA |
9085 | } |
9086 | ||
2b188cc1 JA |
9087 | static void io_commit_sqring(struct io_ring_ctx *ctx) |
9088 | { | |
75b28aff | 9089 | struct io_rings *rings = ctx->rings; |
2b188cc1 | 9090 | |
caf582c6 PB |
9091 | /* |
9092 | * Ensure any loads from the SQEs are done at this point, | |
9093 | * since once we write the new head, the application could | |
9094 | * write new data to them. | |
9095 | */ | |
9096 | smp_store_release(&rings->sq.head, ctx->cached_sq_head); | |
2b188cc1 JA |
9097 | } |
9098 | ||
2b188cc1 | 9099 | /* |
dd9ae8a0 | 9100 | * Fetch an sqe, if one is available. Note this returns a pointer to memory |
2b188cc1 JA |
9101 | * that is mapped by userspace. This means that care needs to be taken to |
9102 | * ensure that reads are stable, as we cannot rely on userspace always | |
9103 | * being a good citizen. If members of the sqe are validated and then later | |
9104 | * used, it's important that those reads are done through READ_ONCE() to | |
9105 | * prevent a re-load down the line. | |
9106 | */ | |
709b302f | 9107 | static const struct io_uring_sqe *io_get_sqe(struct io_ring_ctx *ctx) |
2b188cc1 | 9108 | { |
ea5ab3b5 | 9109 | unsigned head, mask = ctx->sq_entries - 1; |
17d3aeb3 | 9110 | unsigned sq_idx = ctx->cached_sq_head++ & mask; |
2b188cc1 JA |
9111 | |
9112 | /* | |
9113 | * The cached sq head (or cq tail) serves two purposes: | |
9114 | * | |
9115 | * 1) allows us to batch the cost of updating the user visible | |
9116 | * head updates. | |
9117 | * 2) allows the kernel side to track the head on its own, even | |
9118 | * though the application is the one updating it. | |
9119 | */ | |
17d3aeb3 | 9120 | head = READ_ONCE(ctx->sq_array[sq_idx]); |
ebdeb7c0 JA |
9121 | if (likely(head < ctx->sq_entries)) { |
9122 | /* double index for 128-byte SQEs, twice as long */ | |
9123 | if (ctx->flags & IORING_SETUP_SQE128) | |
9124 | head <<= 1; | |
709b302f | 9125 | return &ctx->sq_sqes[head]; |
ebdeb7c0 | 9126 | } |
2b188cc1 JA |
9127 | |
9128 | /* drop invalid entries */ | |
15641e42 PB |
9129 | ctx->cq_extra--; |
9130 | WRITE_ONCE(ctx->rings->sq_dropped, | |
9131 | READ_ONCE(ctx->rings->sq_dropped) + 1); | |
709b302f PB |
9132 | return NULL; |
9133 | } | |
9134 | ||
0f212204 | 9135 | static int io_submit_sqes(struct io_ring_ctx *ctx, unsigned int nr) |
282cdc86 | 9136 | __must_hold(&ctx->uring_lock) |
6c271ce2 | 9137 | { |
69629809 | 9138 | unsigned int entries = io_sqring_entries(ctx); |
8e6971a8 PB |
9139 | unsigned int left; |
9140 | int ret; | |
6c271ce2 | 9141 | |
51d48dab | 9142 | if (unlikely(!entries)) |
69629809 | 9143 | return 0; |
ee7d46d9 | 9144 | /* make sure SQ entry isn't read before tail */ |
8e6971a8 PB |
9145 | ret = left = min3(nr, ctx->sq_entries, entries); |
9146 | io_get_task_refs(left); | |
9147 | io_submit_state_start(&ctx->submit_state, left); | |
6c271ce2 | 9148 | |
69629809 | 9149 | do { |
3529d8c2 | 9150 | const struct io_uring_sqe *sqe; |
196be95c | 9151 | struct io_kiocb *req; |
fb5ccc98 | 9152 | |
8e6971a8 | 9153 | if (unlikely(!io_alloc_req_refill(ctx))) |
fb5ccc98 | 9154 | break; |
a33ae9ce | 9155 | req = io_alloc_req(ctx); |
4fccfcbb PB |
9156 | sqe = io_get_sqe(ctx); |
9157 | if (unlikely(!sqe)) { | |
fa05457a | 9158 | io_req_add_to_cache(req, ctx); |
4fccfcbb PB |
9159 | break; |
9160 | } | |
6c271ce2 | 9161 | |
1cd15904 PB |
9162 | /* |
9163 | * Continue submitting even for sqe failure if the | |
9164 | * ring was setup with IORING_SETUP_SUBMIT_ALL | |
9165 | */ | |
9166 | if (unlikely(io_submit_sqe(ctx, req, sqe)) && | |
9167 | !(ctx->flags & IORING_SETUP_SUBMIT_ALL)) { | |
9168 | left--; | |
9169 | break; | |
bcbb7bf6 | 9170 | } |
1cd15904 | 9171 | } while (--left); |
9466f437 | 9172 | |
8e6971a8 PB |
9173 | if (unlikely(left)) { |
9174 | ret -= left; | |
9175 | /* try again if it submitted nothing and can't allocate a req */ | |
9176 | if (!ret && io_req_cache_empty(ctx)) | |
9177 | ret = -EAGAIN; | |
9178 | current->io_uring->cached_refs += left; | |
9466f437 | 9179 | } |
6c271ce2 | 9180 | |
553deffd | 9181 | io_submit_state_end(ctx); |
ae9428ca PB |
9182 | /* Commit SQ ring head once we've consumed and submitted all SQEs */ |
9183 | io_commit_sqring(ctx); | |
8e6971a8 | 9184 | return ret; |
6c271ce2 JA |
9185 | } |
9186 | ||
e4b6d902 PB |
9187 | static inline bool io_sqd_events_pending(struct io_sq_data *sqd) |
9188 | { | |
9189 | return READ_ONCE(sqd->state); | |
9190 | } | |
9191 | ||
08369246 | 9192 | static int __io_sq_thread(struct io_ring_ctx *ctx, bool cap_entries) |
6c271ce2 | 9193 | { |
c8d1ba58 | 9194 | unsigned int to_submit; |
bdcd3eab | 9195 | int ret = 0; |
6c271ce2 | 9196 | |
c8d1ba58 | 9197 | to_submit = io_sqring_entries(ctx); |
e95eee2d | 9198 | /* if we're handling multiple rings, cap submit size for fairness */ |
4ce8ad95 OL |
9199 | if (cap_entries && to_submit > IORING_SQPOLL_CAP_ENTRIES_VALUE) |
9200 | to_submit = IORING_SQPOLL_CAP_ENTRIES_VALUE; | |
e95eee2d | 9201 | |
5eef4e87 | 9202 | if (!wq_list_empty(&ctx->iopoll_list) || to_submit) { |
948e1947 PB |
9203 | const struct cred *creds = NULL; |
9204 | ||
9205 | if (ctx->sq_creds != current_cred()) | |
9206 | creds = override_creds(ctx->sq_creds); | |
a4c0b3de | 9207 | |
c8d1ba58 | 9208 | mutex_lock(&ctx->uring_lock); |
5eef4e87 | 9209 | if (!wq_list_empty(&ctx->iopoll_list)) |
5ba3c874 | 9210 | io_do_iopoll(ctx, true); |
906a3c6f | 9211 | |
3b763ba1 PB |
9212 | /* |
9213 | * Don't submit if refs are dying, good for io_uring_register(), | |
9214 | * but also it is relied upon by io_ring_exit_work() | |
9215 | */ | |
0298ef96 PB |
9216 | if (to_submit && likely(!percpu_ref_is_dying(&ctx->refs)) && |
9217 | !(ctx->flags & IORING_SETUP_R_DISABLED)) | |
08369246 | 9218 | ret = io_submit_sqes(ctx, to_submit); |
c8d1ba58 | 9219 | mutex_unlock(&ctx->uring_lock); |
cb318216 | 9220 | |
acfb381d PB |
9221 | if (to_submit && wq_has_sleeper(&ctx->sqo_sq_wait)) |
9222 | wake_up(&ctx->sqo_sq_wait); | |
948e1947 PB |
9223 | if (creds) |
9224 | revert_creds(creds); | |
acfb381d | 9225 | } |
6c271ce2 | 9226 | |
08369246 XW |
9227 | return ret; |
9228 | } | |
6c271ce2 | 9229 | |
c072481d | 9230 | static __cold void io_sqd_update_thread_idle(struct io_sq_data *sqd) |
08369246 XW |
9231 | { |
9232 | struct io_ring_ctx *ctx; | |
9233 | unsigned sq_thread_idle = 0; | |
6c271ce2 | 9234 | |
c9dca27d PB |
9235 | list_for_each_entry(ctx, &sqd->ctx_list, sqd_list) |
9236 | sq_thread_idle = max(sq_thread_idle, ctx->sq_thread_idle); | |
08369246 | 9237 | sqd->sq_thread_idle = sq_thread_idle; |
c8d1ba58 | 9238 | } |
6c271ce2 | 9239 | |
e4b6d902 PB |
9240 | static bool io_sqd_handle_event(struct io_sq_data *sqd) |
9241 | { | |
9242 | bool did_sig = false; | |
9243 | struct ksignal ksig; | |
9244 | ||
9245 | if (test_bit(IO_SQ_THREAD_SHOULD_PARK, &sqd->state) || | |
9246 | signal_pending(current)) { | |
9247 | mutex_unlock(&sqd->lock); | |
9248 | if (signal_pending(current)) | |
9249 | did_sig = get_signal(&ksig); | |
9250 | cond_resched(); | |
9251 | mutex_lock(&sqd->lock); | |
9252 | } | |
e4b6d902 PB |
9253 | return did_sig || test_bit(IO_SQ_THREAD_SHOULD_STOP, &sqd->state); |
9254 | } | |
9255 | ||
c8d1ba58 JA |
9256 | static int io_sq_thread(void *data) |
9257 | { | |
69fb2131 JA |
9258 | struct io_sq_data *sqd = data; |
9259 | struct io_ring_ctx *ctx; | |
a0d9205f | 9260 | unsigned long timeout = 0; |
37d1e2e3 | 9261 | char buf[TASK_COMM_LEN]; |
08369246 | 9262 | DEFINE_WAIT(wait); |
6c271ce2 | 9263 | |
696ee88a | 9264 | snprintf(buf, sizeof(buf), "iou-sqp-%d", sqd->task_pid); |
37d1e2e3 | 9265 | set_task_comm(current, buf); |
37d1e2e3 JA |
9266 | |
9267 | if (sqd->sq_cpu != -1) | |
9268 | set_cpus_allowed_ptr(current, cpumask_of(sqd->sq_cpu)); | |
9269 | else | |
9270 | set_cpus_allowed_ptr(current, cpu_online_mask); | |
9271 | current->flags |= PF_NO_SETAFFINITY; | |
9272 | ||
5bd2182d PM |
9273 | audit_alloc_kernel(current); |
9274 | ||
09a6f4ef | 9275 | mutex_lock(&sqd->lock); |
e4b6d902 | 9276 | while (1) { |
1a924a80 | 9277 | bool cap_entries, sqt_spin = false; |
c1edbf5f | 9278 | |
e4b6d902 PB |
9279 | if (io_sqd_events_pending(sqd) || signal_pending(current)) { |
9280 | if (io_sqd_handle_event(sqd)) | |
c7d95613 | 9281 | break; |
08369246 XW |
9282 | timeout = jiffies + sqd->sq_thread_idle; |
9283 | } | |
e4b6d902 | 9284 | |
e95eee2d | 9285 | cap_entries = !list_is_singular(&sqd->ctx_list); |
69fb2131 | 9286 | list_for_each_entry(ctx, &sqd->ctx_list, sqd_list) { |
948e1947 | 9287 | int ret = __io_sq_thread(ctx, cap_entries); |
7c30f36a | 9288 | |
5eef4e87 | 9289 | if (!sqt_spin && (ret > 0 || !wq_list_empty(&ctx->iopoll_list))) |
08369246 | 9290 | sqt_spin = true; |
69fb2131 | 9291 | } |
dd432ea5 PB |
9292 | if (io_run_task_work()) |
9293 | sqt_spin = true; | |
6c271ce2 | 9294 | |
08369246 | 9295 | if (sqt_spin || !time_after(jiffies, timeout)) { |
c8d1ba58 | 9296 | cond_resched(); |
08369246 XW |
9297 | if (sqt_spin) |
9298 | timeout = jiffies + sqd->sq_thread_idle; | |
9299 | continue; | |
9300 | } | |
9301 | ||
08369246 | 9302 | prepare_to_wait(&sqd->wait, &wait, TASK_INTERRUPTIBLE); |
7f62d40d | 9303 | if (!io_sqd_events_pending(sqd) && !task_work_pending(current)) { |
1a924a80 PB |
9304 | bool needs_sched = true; |
9305 | ||
724cb4f9 | 9306 | list_for_each_entry(ctx, &sqd->ctx_list, sqd_list) { |
3a4b89a2 JA |
9307 | atomic_or(IORING_SQ_NEED_WAKEUP, |
9308 | &ctx->rings->sq_flags); | |
724cb4f9 | 9309 | if ((ctx->flags & IORING_SETUP_IOPOLL) && |
5eef4e87 | 9310 | !wq_list_empty(&ctx->iopoll_list)) { |
724cb4f9 HX |
9311 | needs_sched = false; |
9312 | break; | |
9313 | } | |
649bb75d AK |
9314 | |
9315 | /* | |
9316 | * Ensure the store of the wakeup flag is not | |
9317 | * reordered with the load of the SQ tail | |
9318 | */ | |
f2e030dd | 9319 | smp_mb__after_atomic(); |
649bb75d | 9320 | |
724cb4f9 HX |
9321 | if (io_sqring_entries(ctx)) { |
9322 | needs_sched = false; | |
9323 | break; | |
9324 | } | |
9325 | } | |
9326 | ||
9327 | if (needs_sched) { | |
9328 | mutex_unlock(&sqd->lock); | |
9329 | schedule(); | |
9330 | mutex_lock(&sqd->lock); | |
9331 | } | |
69fb2131 | 9332 | list_for_each_entry(ctx, &sqd->ctx_list, sqd_list) |
3a4b89a2 JA |
9333 | atomic_andnot(IORING_SQ_NEED_WAKEUP, |
9334 | &ctx->rings->sq_flags); | |
6c271ce2 | 9335 | } |
08369246 XW |
9336 | |
9337 | finish_wait(&sqd->wait, &wait); | |
9338 | timeout = jiffies + sqd->sq_thread_idle; | |
6c271ce2 | 9339 | } |
28cea78a | 9340 | |
78cc687b | 9341 | io_uring_cancel_generic(true, sqd); |
37d1e2e3 | 9342 | sqd->thread = NULL; |
05962f95 | 9343 | list_for_each_entry(ctx, &sqd->ctx_list, sqd_list) |
3a4b89a2 | 9344 | atomic_or(IORING_SQ_NEED_WAKEUP, &ctx->rings->sq_flags); |
521d6a73 | 9345 | io_run_task_work(); |
734551df PB |
9346 | mutex_unlock(&sqd->lock); |
9347 | ||
5bd2182d PM |
9348 | audit_free(current); |
9349 | ||
37d1e2e3 JA |
9350 | complete(&sqd->exited); |
9351 | do_exit(0); | |
6c271ce2 JA |
9352 | } |
9353 | ||
bda52162 JA |
9354 | struct io_wait_queue { |
9355 | struct wait_queue_entry wq; | |
9356 | struct io_ring_ctx *ctx; | |
5fd46178 | 9357 | unsigned cq_tail; |
bda52162 JA |
9358 | unsigned nr_timeouts; |
9359 | }; | |
9360 | ||
6c503150 | 9361 | static inline bool io_should_wake(struct io_wait_queue *iowq) |
bda52162 JA |
9362 | { |
9363 | struct io_ring_ctx *ctx = iowq->ctx; | |
5fd46178 | 9364 | int dist = ctx->cached_cq_tail - (int) iowq->cq_tail; |
bda52162 JA |
9365 | |
9366 | /* | |
d195a66e | 9367 | * Wake up if we have enough events, or if a timeout occurred since we |
bda52162 JA |
9368 | * started waiting. For timeouts, we always want to return to userspace, |
9369 | * regardless of event count. | |
9370 | */ | |
5fd46178 | 9371 | return dist >= 0 || atomic_read(&ctx->cq_timeouts) != iowq->nr_timeouts; |
bda52162 JA |
9372 | } |
9373 | ||
9374 | static int io_wake_function(struct wait_queue_entry *curr, unsigned int mode, | |
9375 | int wake_flags, void *key) | |
9376 | { | |
9377 | struct io_wait_queue *iowq = container_of(curr, struct io_wait_queue, | |
9378 | wq); | |
9379 | ||
6c503150 PB |
9380 | /* |
9381 | * Cannot safely flush overflowed CQEs from here, ensure we wake up | |
9382 | * the task, and the next invocation will do it. | |
9383 | */ | |
10988a0a DY |
9384 | if (io_should_wake(iowq) || |
9385 | test_bit(IO_CHECK_CQ_OVERFLOW_BIT, &iowq->ctx->check_cq)) | |
6c503150 PB |
9386 | return autoremove_wake_function(curr, mode, wake_flags, key); |
9387 | return -1; | |
bda52162 JA |
9388 | } |
9389 | ||
af9c1a44 JA |
9390 | static int io_run_task_work_sig(void) |
9391 | { | |
9392 | if (io_run_task_work()) | |
9393 | return 1; | |
0b8cfa97 | 9394 | if (test_thread_flag(TIF_NOTIFY_SIGNAL)) |
792ee0f6 | 9395 | return -ERESTARTSYS; |
c5020bc8 OL |
9396 | if (task_sigpending(current)) |
9397 | return -EINTR; | |
9398 | return 0; | |
af9c1a44 JA |
9399 | } |
9400 | ||
eeb60b9a PB |
9401 | /* when returns >0, the caller should retry */ |
9402 | static inline int io_cqring_wait_schedule(struct io_ring_ctx *ctx, | |
9403 | struct io_wait_queue *iowq, | |
22833966 | 9404 | ktime_t timeout) |
eeb60b9a PB |
9405 | { |
9406 | int ret; | |
155bc950 | 9407 | unsigned long check_cq; |
eeb60b9a PB |
9408 | |
9409 | /* make sure we run task_work before checking for signals */ | |
9410 | ret = io_run_task_work_sig(); | |
9411 | if (ret || io_should_wake(iowq)) | |
9412 | return ret; | |
155bc950 | 9413 | check_cq = READ_ONCE(ctx->check_cq); |
eeb60b9a | 9414 | /* let the caller flush overflows, retry */ |
155bc950 | 9415 | if (check_cq & BIT(IO_CHECK_CQ_OVERFLOW_BIT)) |
eeb60b9a | 9416 | return 1; |
155bc950 DY |
9417 | if (unlikely(check_cq & BIT(IO_CHECK_CQ_DROPPED_BIT))) |
9418 | return -EBADR; | |
22833966 JA |
9419 | if (!schedule_hrtimeout(&timeout, HRTIMER_MODE_ABS)) |
9420 | return -ETIME; | |
9421 | return 1; | |
eeb60b9a PB |
9422 | } |
9423 | ||
2b188cc1 JA |
9424 | /* |
9425 | * Wait until events become available, if we don't already have some. The | |
9426 | * application must reap them itself, as they reside on the shared cq ring. | |
9427 | */ | |
9428 | static int io_cqring_wait(struct io_ring_ctx *ctx, int min_events, | |
c73ebb68 HX |
9429 | const sigset_t __user *sig, size_t sigsz, |
9430 | struct __kernel_timespec __user *uts) | |
2b188cc1 | 9431 | { |
90291099 | 9432 | struct io_wait_queue iowq; |
75b28aff | 9433 | struct io_rings *rings = ctx->rings; |
22833966 | 9434 | ktime_t timeout = KTIME_MAX; |
c1d5a224 | 9435 | int ret; |
2b188cc1 | 9436 | |
b41e9852 | 9437 | do { |
90f67366 | 9438 | io_cqring_overflow_flush(ctx); |
6c503150 | 9439 | if (io_cqring_events(ctx) >= min_events) |
b41e9852 | 9440 | return 0; |
4c6e277c | 9441 | if (!io_run_task_work()) |
b41e9852 | 9442 | break; |
b41e9852 | 9443 | } while (1); |
2b188cc1 JA |
9444 | |
9445 | if (sig) { | |
9e75ad5d AB |
9446 | #ifdef CONFIG_COMPAT |
9447 | if (in_compat_syscall()) | |
9448 | ret = set_compat_user_sigmask((const compat_sigset_t __user *)sig, | |
b772434b | 9449 | sigsz); |
9e75ad5d AB |
9450 | else |
9451 | #endif | |
b772434b | 9452 | ret = set_user_sigmask(sig, sigsz); |
9e75ad5d | 9453 | |
2b188cc1 JA |
9454 | if (ret) |
9455 | return ret; | |
9456 | } | |
9457 | ||
950e79dd OL |
9458 | if (uts) { |
9459 | struct timespec64 ts; | |
9460 | ||
9461 | if (get_timespec64(&ts, uts)) | |
9462 | return -EFAULT; | |
9463 | timeout = ktime_add_ns(timespec64_to_ktime(ts), ktime_get_ns()); | |
9464 | } | |
9465 | ||
90291099 PB |
9466 | init_waitqueue_func_entry(&iowq.wq, io_wake_function); |
9467 | iowq.wq.private = current; | |
9468 | INIT_LIST_HEAD(&iowq.wq.entry); | |
9469 | iowq.ctx = ctx; | |
bda52162 | 9470 | iowq.nr_timeouts = atomic_read(&ctx->cq_timeouts); |
5fd46178 | 9471 | iowq.cq_tail = READ_ONCE(ctx->rings->cq.head) + min_events; |
90291099 | 9472 | |
c826bd7a | 9473 | trace_io_uring_cqring_wait(ctx, min_events); |
bda52162 | 9474 | do { |
ca0a2651 | 9475 | /* if we can't even flush overflow, don't wait for more */ |
90f67366 | 9476 | if (!io_cqring_overflow_flush(ctx)) { |
ca0a2651 JA |
9477 | ret = -EBUSY; |
9478 | break; | |
9479 | } | |
311997b3 | 9480 | prepare_to_wait_exclusive(&ctx->cq_wait, &iowq.wq, |
bda52162 | 9481 | TASK_INTERRUPTIBLE); |
22833966 | 9482 | ret = io_cqring_wait_schedule(ctx, &iowq, timeout); |
ca0a2651 | 9483 | cond_resched(); |
eeb60b9a | 9484 | } while (ret > 0); |
bda52162 | 9485 | |
b4f20bb4 | 9486 | finish_wait(&ctx->cq_wait, &iowq.wq); |
b7db41c9 | 9487 | restore_saved_sigmask_unless(ret == -EINTR); |
2b188cc1 | 9488 | |
75b28aff | 9489 | return READ_ONCE(rings->cq.head) == READ_ONCE(rings->cq.tail) ? ret : 0; |
2b188cc1 JA |
9490 | } |
9491 | ||
9123c8ff | 9492 | static void io_free_page_table(void **table, size_t size) |
05f3fb3c | 9493 | { |
9123c8ff | 9494 | unsigned i, nr_tables = DIV_ROUND_UP(size, PAGE_SIZE); |
05f3fb3c | 9495 | |
846a4ef2 | 9496 | for (i = 0; i < nr_tables; i++) |
9123c8ff PB |
9497 | kfree(table[i]); |
9498 | kfree(table); | |
9499 | } | |
9500 | ||
c072481d | 9501 | static __cold void **io_alloc_page_table(size_t size) |
9123c8ff PB |
9502 | { |
9503 | unsigned i, nr_tables = DIV_ROUND_UP(size, PAGE_SIZE); | |
9504 | size_t init_size = size; | |
9505 | void **table; | |
9506 | ||
0bea96f5 | 9507 | table = kcalloc(nr_tables, sizeof(*table), GFP_KERNEL_ACCOUNT); |
9123c8ff PB |
9508 | if (!table) |
9509 | return NULL; | |
9510 | ||
9511 | for (i = 0; i < nr_tables; i++) { | |
27f6b318 | 9512 | unsigned int this_size = min_t(size_t, size, PAGE_SIZE); |
9123c8ff | 9513 | |
0bea96f5 | 9514 | table[i] = kzalloc(this_size, GFP_KERNEL_ACCOUNT); |
9123c8ff PB |
9515 | if (!table[i]) { |
9516 | io_free_page_table(table, init_size); | |
9517 | return NULL; | |
9518 | } | |
9519 | size -= this_size; | |
9520 | } | |
9521 | return table; | |
05f3fb3c JA |
9522 | } |
9523 | ||
28a9fe25 | 9524 | static void io_rsrc_node_destroy(struct io_rsrc_node *ref_node) |
1642b445 | 9525 | { |
28a9fe25 PB |
9526 | percpu_ref_exit(&ref_node->refs); |
9527 | kfree(ref_node); | |
1642b445 PB |
9528 | } |
9529 | ||
c072481d | 9530 | static __cold void io_rsrc_node_ref_zero(struct percpu_ref *ref) |
b9bd2bea PB |
9531 | { |
9532 | struct io_rsrc_node *node = container_of(ref, struct io_rsrc_node, refs); | |
9533 | struct io_ring_ctx *ctx = node->rsrc_data->ctx; | |
9534 | unsigned long flags; | |
9535 | bool first_add = false; | |
b36a2050 | 9536 | unsigned long delay = HZ; |
b9bd2bea PB |
9537 | |
9538 | spin_lock_irqsave(&ctx->rsrc_ref_lock, flags); | |
9539 | node->done = true; | |
9540 | ||
b36a2050 DY |
9541 | /* if we are mid-quiesce then do not delay */ |
9542 | if (node->rsrc_data->quiesce) | |
9543 | delay = 0; | |
9544 | ||
b9bd2bea PB |
9545 | while (!list_empty(&ctx->rsrc_ref_list)) { |
9546 | node = list_first_entry(&ctx->rsrc_ref_list, | |
9547 | struct io_rsrc_node, node); | |
9548 | /* recycle ref nodes in order */ | |
9549 | if (!node->done) | |
9550 | break; | |
9551 | list_del(&node->node); | |
9552 | first_add |= llist_add(&node->llist, &ctx->rsrc_put_llist); | |
9553 | } | |
9554 | spin_unlock_irqrestore(&ctx->rsrc_ref_lock, flags); | |
9555 | ||
9556 | if (first_add) | |
b36a2050 | 9557 | mod_delayed_work(system_wq, &ctx->rsrc_put_work, delay); |
b9bd2bea PB |
9558 | } |
9559 | ||
f6133fbd | 9560 | static struct io_rsrc_node *io_rsrc_node_alloc(void) |
b9bd2bea PB |
9561 | { |
9562 | struct io_rsrc_node *ref_node; | |
9563 | ||
9564 | ref_node = kzalloc(sizeof(*ref_node), GFP_KERNEL); | |
9565 | if (!ref_node) | |
9566 | return NULL; | |
9567 | ||
9568 | if (percpu_ref_init(&ref_node->refs, io_rsrc_node_ref_zero, | |
9569 | 0, GFP_KERNEL)) { | |
9570 | kfree(ref_node); | |
9571 | return NULL; | |
9572 | } | |
9573 | INIT_LIST_HEAD(&ref_node->node); | |
9574 | INIT_LIST_HEAD(&ref_node->rsrc_list); | |
9575 | ref_node->done = false; | |
9576 | return ref_node; | |
9577 | } | |
9578 | ||
a7f0ed5a PB |
9579 | static void io_rsrc_node_switch(struct io_ring_ctx *ctx, |
9580 | struct io_rsrc_data *data_to_kill) | |
ab409402 | 9581 | __must_hold(&ctx->uring_lock) |
6b06314c | 9582 | { |
a7f0ed5a PB |
9583 | WARN_ON_ONCE(!ctx->rsrc_backup_node); |
9584 | WARN_ON_ONCE(data_to_kill && !ctx->rsrc_node); | |
6b06314c | 9585 | |
ab409402 PB |
9586 | io_rsrc_refs_drop(ctx); |
9587 | ||
a7f0ed5a PB |
9588 | if (data_to_kill) { |
9589 | struct io_rsrc_node *rsrc_node = ctx->rsrc_node; | |
82fbcfa9 | 9590 | |
a7f0ed5a | 9591 | rsrc_node->rsrc_data = data_to_kill; |
4956b9ea | 9592 | spin_lock_irq(&ctx->rsrc_ref_lock); |
a7f0ed5a | 9593 | list_add_tail(&rsrc_node->node, &ctx->rsrc_ref_list); |
4956b9ea | 9594 | spin_unlock_irq(&ctx->rsrc_ref_lock); |
82fbcfa9 | 9595 | |
3e942498 | 9596 | atomic_inc(&data_to_kill->refs); |
a7f0ed5a PB |
9597 | percpu_ref_kill(&rsrc_node->refs); |
9598 | ctx->rsrc_node = NULL; | |
9599 | } | |
6b06314c | 9600 | |
a7f0ed5a PB |
9601 | if (!ctx->rsrc_node) { |
9602 | ctx->rsrc_node = ctx->rsrc_backup_node; | |
9603 | ctx->rsrc_backup_node = NULL; | |
9604 | } | |
8bad28d8 HX |
9605 | } |
9606 | ||
a7f0ed5a | 9607 | static int io_rsrc_node_switch_start(struct io_ring_ctx *ctx) |
8dd03afe PB |
9608 | { |
9609 | if (ctx->rsrc_backup_node) | |
9610 | return 0; | |
f6133fbd | 9611 | ctx->rsrc_backup_node = io_rsrc_node_alloc(); |
8dd03afe | 9612 | return ctx->rsrc_backup_node ? 0 : -ENOMEM; |
8bad28d8 HX |
9613 | } |
9614 | ||
c072481d PB |
9615 | static __cold int io_rsrc_ref_quiesce(struct io_rsrc_data *data, |
9616 | struct io_ring_ctx *ctx) | |
8bad28d8 HX |
9617 | { |
9618 | int ret; | |
05589553 | 9619 | |
215c3902 | 9620 | /* As we may drop ->uring_lock, other task may have started quiesce */ |
8bad28d8 HX |
9621 | if (data->quiesce) |
9622 | return -ENXIO; | |
05589553 | 9623 | |
8bad28d8 | 9624 | data->quiesce = true; |
1ffc5422 | 9625 | do { |
a7f0ed5a | 9626 | ret = io_rsrc_node_switch_start(ctx); |
8dd03afe | 9627 | if (ret) |
f2303b1f | 9628 | break; |
a7f0ed5a | 9629 | io_rsrc_node_switch(ctx, data); |
f2303b1f | 9630 | |
3e942498 PB |
9631 | /* kill initial ref, already quiesced if zero */ |
9632 | if (atomic_dec_and_test(&data->refs)) | |
9633 | break; | |
c018db4a | 9634 | mutex_unlock(&ctx->uring_lock); |
8bad28d8 | 9635 | flush_delayed_work(&ctx->rsrc_put_work); |
1ffc5422 | 9636 | ret = wait_for_completion_interruptible(&data->done); |
c018db4a JA |
9637 | if (!ret) { |
9638 | mutex_lock(&ctx->uring_lock); | |
80912cef DY |
9639 | if (atomic_read(&data->refs) > 0) { |
9640 | /* | |
9641 | * it has been revived by another thread while | |
9642 | * we were unlocked | |
9643 | */ | |
9644 | mutex_unlock(&ctx->uring_lock); | |
9645 | } else { | |
9646 | break; | |
9647 | } | |
c018db4a | 9648 | } |
8bad28d8 | 9649 | |
3e942498 PB |
9650 | atomic_inc(&data->refs); |
9651 | /* wait for all works potentially completing data->done */ | |
9652 | flush_delayed_work(&ctx->rsrc_put_work); | |
cb5e1b81 | 9653 | reinit_completion(&data->done); |
8dd03afe | 9654 | |
1ffc5422 | 9655 | ret = io_run_task_work_sig(); |
8bad28d8 | 9656 | mutex_lock(&ctx->uring_lock); |
f2303b1f | 9657 | } while (ret >= 0); |
8bad28d8 | 9658 | data->quiesce = false; |
05f3fb3c | 9659 | |
8bad28d8 | 9660 | return ret; |
d7954b2b BM |
9661 | } |
9662 | ||
2d091d62 PB |
9663 | static u64 *io_get_tag_slot(struct io_rsrc_data *data, unsigned int idx) |
9664 | { | |
9665 | unsigned int off = idx & IO_RSRC_TAG_TABLE_MASK; | |
9666 | unsigned int table_idx = idx >> IO_RSRC_TAG_TABLE_SHIFT; | |
9667 | ||
9668 | return &data->tags[table_idx][off]; | |
9669 | } | |
9670 | ||
44b31f2f | 9671 | static void io_rsrc_data_free(struct io_rsrc_data *data) |
1ad555c6 | 9672 | { |
2d091d62 PB |
9673 | size_t size = data->nr * sizeof(data->tags[0][0]); |
9674 | ||
9675 | if (data->tags) | |
9676 | io_free_page_table((void **)data->tags, size); | |
44b31f2f PB |
9677 | kfree(data); |
9678 | } | |
9679 | ||
c072481d PB |
9680 | static __cold int io_rsrc_data_alloc(struct io_ring_ctx *ctx, rsrc_put_fn *do_put, |
9681 | u64 __user *utags, unsigned nr, | |
9682 | struct io_rsrc_data **pdata) | |
1ad555c6 | 9683 | { |
b895c9a6 | 9684 | struct io_rsrc_data *data; |
2d091d62 | 9685 | int ret = -ENOMEM; |
d878c816 | 9686 | unsigned i; |
1ad555c6 BM |
9687 | |
9688 | data = kzalloc(sizeof(*data), GFP_KERNEL); | |
9689 | if (!data) | |
d878c816 | 9690 | return -ENOMEM; |
2d091d62 | 9691 | data->tags = (u64 **)io_alloc_page_table(nr * sizeof(data->tags[0][0])); |
b60c8dce | 9692 | if (!data->tags) { |
1ad555c6 | 9693 | kfree(data); |
d878c816 PB |
9694 | return -ENOMEM; |
9695 | } | |
2d091d62 PB |
9696 | |
9697 | data->nr = nr; | |
9698 | data->ctx = ctx; | |
9699 | data->do_put = do_put; | |
d878c816 | 9700 | if (utags) { |
2d091d62 | 9701 | ret = -EFAULT; |
d878c816 | 9702 | for (i = 0; i < nr; i++) { |
fdd1dc31 CIK |
9703 | u64 *tag_slot = io_get_tag_slot(data, i); |
9704 | ||
9705 | if (copy_from_user(tag_slot, &utags[i], | |
9706 | sizeof(*tag_slot))) | |
2d091d62 | 9707 | goto fail; |
d878c816 | 9708 | } |
1ad555c6 | 9709 | } |
b60c8dce | 9710 | |
3e942498 | 9711 | atomic_set(&data->refs, 1); |
1ad555c6 | 9712 | init_completion(&data->done); |
d878c816 PB |
9713 | *pdata = data; |
9714 | return 0; | |
2d091d62 PB |
9715 | fail: |
9716 | io_rsrc_data_free(data); | |
9717 | return ret; | |
1ad555c6 BM |
9718 | } |
9719 | ||
9123c8ff PB |
9720 | static bool io_alloc_file_tables(struct io_file_table *table, unsigned nr_files) |
9721 | { | |
0bea96f5 PB |
9722 | table->files = kvcalloc(nr_files, sizeof(table->files[0]), |
9723 | GFP_KERNEL_ACCOUNT); | |
d78bd8ad JA |
9724 | if (unlikely(!table->files)) |
9725 | return false; | |
9726 | ||
9727 | table->bitmap = bitmap_zalloc(nr_files, GFP_KERNEL_ACCOUNT); | |
9728 | if (unlikely(!table->bitmap)) { | |
9729 | kvfree(table->files); | |
9730 | return false; | |
9731 | } | |
9732 | ||
9733 | return true; | |
9123c8ff PB |
9734 | } |
9735 | ||
042b0d85 | 9736 | static void io_free_file_tables(struct io_file_table *table) |
9123c8ff | 9737 | { |
042b0d85 | 9738 | kvfree(table->files); |
d78bd8ad | 9739 | bitmap_free(table->bitmap); |
9123c8ff | 9740 | table->files = NULL; |
d78bd8ad JA |
9741 | table->bitmap = NULL; |
9742 | } | |
9743 | ||
9744 | static inline void io_file_bitmap_set(struct io_file_table *table, int bit) | |
9745 | { | |
9746 | WARN_ON_ONCE(test_bit(bit, table->bitmap)); | |
9747 | __set_bit(bit, table->bitmap); | |
4278a0de | 9748 | table->alloc_hint = bit + 1; |
d78bd8ad JA |
9749 | } |
9750 | ||
9751 | static inline void io_file_bitmap_clear(struct io_file_table *table, int bit) | |
9752 | { | |
9753 | __clear_bit(bit, table->bitmap); | |
b70b8e33 | 9754 | table->alloc_hint = bit; |
9123c8ff PB |
9755 | } |
9756 | ||
fff4db76 | 9757 | static void __io_sqe_files_unregister(struct io_ring_ctx *ctx) |
1ad555c6 | 9758 | { |
69cc1b6f | 9759 | #if !defined(IO_URING_SCM_ALL) |
1f59bc0f PB |
9760 | int i; |
9761 | ||
9762 | for (i = 0; i < ctx->nr_user_files; i++) { | |
9763 | struct file *file = io_file_from_index(ctx, i); | |
9764 | ||
5e45690a JA |
9765 | if (!file) |
9766 | continue; | |
9767 | if (io_fixed_file_slot(&ctx->file_table, i)->file_ptr & FFS_SCM) | |
1f59bc0f | 9768 | continue; |
d78bd8ad | 9769 | io_file_bitmap_clear(&ctx->file_table, i); |
1f59bc0f PB |
9770 | fput(file); |
9771 | } | |
5e45690a | 9772 | #endif |
1f59bc0f | 9773 | |
fff4db76 PB |
9774 | #if defined(CONFIG_UNIX) |
9775 | if (ctx->ring_sock) { | |
9776 | struct sock *sock = ctx->ring_sock->sk; | |
9777 | struct sk_buff *skb; | |
9778 | ||
9779 | while ((skb = skb_dequeue(&sock->sk_receive_queue)) != NULL) | |
9780 | kfree_skb(skb); | |
9781 | } | |
fff4db76 | 9782 | #endif |
042b0d85 | 9783 | io_free_file_tables(&ctx->file_table); |
44b31f2f | 9784 | io_rsrc_data_free(ctx->file_data); |
fff4db76 PB |
9785 | ctx->file_data = NULL; |
9786 | ctx->nr_user_files = 0; | |
1ad555c6 BM |
9787 | } |
9788 | ||
d7954b2b BM |
9789 | static int io_sqe_files_unregister(struct io_ring_ctx *ctx) |
9790 | { | |
d7954b2b BM |
9791 | int ret; |
9792 | ||
08480400 | 9793 | if (!ctx->file_data) |
d7954b2b | 9794 | return -ENXIO; |
08480400 PB |
9795 | ret = io_rsrc_ref_quiesce(ctx->file_data, ctx); |
9796 | if (!ret) | |
9797 | __io_sqe_files_unregister(ctx); | |
9798 | return ret; | |
6b06314c JA |
9799 | } |
9800 | ||
37d1e2e3 | 9801 | static void io_sq_thread_unpark(struct io_sq_data *sqd) |
09a6f4ef | 9802 | __releases(&sqd->lock) |
37d1e2e3 | 9803 | { |
521d6a73 PB |
9804 | WARN_ON_ONCE(sqd->thread == current); |
9805 | ||
9e138a48 PB |
9806 | /* |
9807 | * Do the dance but not conditional clear_bit() because it'd race with | |
9808 | * other threads incrementing park_pending and setting the bit. | |
9809 | */ | |
37d1e2e3 | 9810 | clear_bit(IO_SQ_THREAD_SHOULD_PARK, &sqd->state); |
9e138a48 PB |
9811 | if (atomic_dec_return(&sqd->park_pending)) |
9812 | set_bit(IO_SQ_THREAD_SHOULD_PARK, &sqd->state); | |
09a6f4ef | 9813 | mutex_unlock(&sqd->lock); |
37d1e2e3 JA |
9814 | } |
9815 | ||
86e0d676 | 9816 | static void io_sq_thread_park(struct io_sq_data *sqd) |
09a6f4ef | 9817 | __acquires(&sqd->lock) |
37d1e2e3 | 9818 | { |
521d6a73 PB |
9819 | WARN_ON_ONCE(sqd->thread == current); |
9820 | ||
9e138a48 | 9821 | atomic_inc(&sqd->park_pending); |
86e0d676 | 9822 | set_bit(IO_SQ_THREAD_SHOULD_PARK, &sqd->state); |
09a6f4ef | 9823 | mutex_lock(&sqd->lock); |
05962f95 | 9824 | if (sqd->thread) |
86e0d676 | 9825 | wake_up_process(sqd->thread); |
37d1e2e3 JA |
9826 | } |
9827 | ||
9828 | static void io_sq_thread_stop(struct io_sq_data *sqd) | |
9829 | { | |
521d6a73 | 9830 | WARN_ON_ONCE(sqd->thread == current); |
88885f66 | 9831 | WARN_ON_ONCE(test_bit(IO_SQ_THREAD_SHOULD_STOP, &sqd->state)); |
521d6a73 | 9832 | |
05962f95 | 9833 | set_bit(IO_SQ_THREAD_SHOULD_STOP, &sqd->state); |
88885f66 | 9834 | mutex_lock(&sqd->lock); |
e8f98f24 JA |
9835 | if (sqd->thread) |
9836 | wake_up_process(sqd->thread); | |
09a6f4ef | 9837 | mutex_unlock(&sqd->lock); |
05962f95 | 9838 | wait_for_completion(&sqd->exited); |
37d1e2e3 JA |
9839 | } |
9840 | ||
534ca6d6 | 9841 | static void io_put_sq_data(struct io_sq_data *sqd) |
6c271ce2 | 9842 | { |
534ca6d6 | 9843 | if (refcount_dec_and_test(&sqd->refs)) { |
9e138a48 PB |
9844 | WARN_ON_ONCE(atomic_read(&sqd->park_pending)); |
9845 | ||
37d1e2e3 JA |
9846 | io_sq_thread_stop(sqd); |
9847 | kfree(sqd); | |
9848 | } | |
9849 | } | |
9850 | ||
9851 | static void io_sq_thread_finish(struct io_ring_ctx *ctx) | |
9852 | { | |
9853 | struct io_sq_data *sqd = ctx->sq_data; | |
9854 | ||
9855 | if (sqd) { | |
05962f95 | 9856 | io_sq_thread_park(sqd); |
521d6a73 | 9857 | list_del_init(&ctx->sqd_list); |
37d1e2e3 | 9858 | io_sqd_update_thread_idle(sqd); |
05962f95 | 9859 | io_sq_thread_unpark(sqd); |
37d1e2e3 JA |
9860 | |
9861 | io_put_sq_data(sqd); | |
9862 | ctx->sq_data = NULL; | |
534ca6d6 JA |
9863 | } |
9864 | } | |
9865 | ||
aa06165d JA |
9866 | static struct io_sq_data *io_attach_sq_data(struct io_uring_params *p) |
9867 | { | |
9868 | struct io_ring_ctx *ctx_attach; | |
9869 | struct io_sq_data *sqd; | |
9870 | struct fd f; | |
9871 | ||
9872 | f = fdget(p->wq_fd); | |
9873 | if (!f.file) | |
9874 | return ERR_PTR(-ENXIO); | |
9875 | if (f.file->f_op != &io_uring_fops) { | |
9876 | fdput(f); | |
9877 | return ERR_PTR(-EINVAL); | |
9878 | } | |
9879 | ||
9880 | ctx_attach = f.file->private_data; | |
9881 | sqd = ctx_attach->sq_data; | |
9882 | if (!sqd) { | |
9883 | fdput(f); | |
9884 | return ERR_PTR(-EINVAL); | |
9885 | } | |
5c2469e0 JA |
9886 | if (sqd->task_tgid != current->tgid) { |
9887 | fdput(f); | |
9888 | return ERR_PTR(-EPERM); | |
9889 | } | |
aa06165d JA |
9890 | |
9891 | refcount_inc(&sqd->refs); | |
9892 | fdput(f); | |
9893 | return sqd; | |
9894 | } | |
9895 | ||
26984fbf PB |
9896 | static struct io_sq_data *io_get_sq_data(struct io_uring_params *p, |
9897 | bool *attached) | |
534ca6d6 JA |
9898 | { |
9899 | struct io_sq_data *sqd; | |
9900 | ||
26984fbf | 9901 | *attached = false; |
5c2469e0 JA |
9902 | if (p->flags & IORING_SETUP_ATTACH_WQ) { |
9903 | sqd = io_attach_sq_data(p); | |
26984fbf PB |
9904 | if (!IS_ERR(sqd)) { |
9905 | *attached = true; | |
5c2469e0 | 9906 | return sqd; |
26984fbf | 9907 | } |
5c2469e0 JA |
9908 | /* fall through for EPERM case, setup new sqd/task */ |
9909 | if (PTR_ERR(sqd) != -EPERM) | |
9910 | return sqd; | |
9911 | } | |
aa06165d | 9912 | |
534ca6d6 JA |
9913 | sqd = kzalloc(sizeof(*sqd), GFP_KERNEL); |
9914 | if (!sqd) | |
9915 | return ERR_PTR(-ENOMEM); | |
9916 | ||
9e138a48 | 9917 | atomic_set(&sqd->park_pending, 0); |
534ca6d6 | 9918 | refcount_set(&sqd->refs, 1); |
69fb2131 | 9919 | INIT_LIST_HEAD(&sqd->ctx_list); |
09a6f4ef | 9920 | mutex_init(&sqd->lock); |
534ca6d6 | 9921 | init_waitqueue_head(&sqd->wait); |
37d1e2e3 | 9922 | init_completion(&sqd->exited); |
534ca6d6 JA |
9923 | return sqd; |
9924 | } | |
9925 | ||
6b06314c JA |
9926 | /* |
9927 | * Ensure the UNIX gc is aware of our file set, so we are certain that | |
9928 | * the io_uring can be safely unregistered on process exit, even if we have | |
1f59bc0f PB |
9929 | * loops in the file referencing. We account only files that can hold other |
9930 | * files because otherwise they can't form a loop and so are not interesting | |
9931 | * for GC. | |
6b06314c | 9932 | */ |
8b3171bd | 9933 | static int io_scm_file_account(struct io_ring_ctx *ctx, struct file *file) |
6b06314c | 9934 | { |
73b25d3b | 9935 | #if defined(CONFIG_UNIX) |
6b06314c | 9936 | struct sock *sk = ctx->ring_sock->sk; |
73b25d3b | 9937 | struct sk_buff_head *head = &sk->sk_receive_queue; |
6b06314c JA |
9938 | struct scm_fp_list *fpl; |
9939 | struct sk_buff *skb; | |
6b06314c | 9940 | |
73b25d3b PB |
9941 | if (likely(!io_file_need_scm(file))) |
9942 | return 0; | |
6b06314c | 9943 | |
73b25d3b PB |
9944 | /* |
9945 | * See if we can merge this file into an existing skb SCM_RIGHTS | |
9946 | * file set. If there's no room, fall back to allocating a new skb | |
9947 | * and filling it in. | |
9948 | */ | |
9949 | spin_lock_irq(&head->lock); | |
9950 | skb = skb_peek(head); | |
9951 | if (skb && UNIXCB(skb).fp->count < SCM_MAX_FD) | |
9952 | __skb_unlink(skb, head); | |
9953 | else | |
9954 | skb = NULL; | |
9955 | spin_unlock_irq(&head->lock); | |
6b06314c | 9956 | |
6b06314c | 9957 | if (!skb) { |
73b25d3b PB |
9958 | fpl = kzalloc(sizeof(*fpl), GFP_KERNEL); |
9959 | if (!fpl) | |
9960 | return -ENOMEM; | |
6b06314c | 9961 | |
73b25d3b PB |
9962 | skb = alloc_skb(0, GFP_KERNEL); |
9963 | if (!skb) { | |
9964 | kfree(fpl); | |
9965 | return -ENOMEM; | |
9966 | } | |
6b06314c | 9967 | |
73b25d3b PB |
9968 | fpl->user = get_uid(current_user()); |
9969 | fpl->max = SCM_MAX_FD; | |
9970 | fpl->count = 0; | |
65e19f54 | 9971 | |
73b25d3b PB |
9972 | UNIXCB(skb).fp = fpl; |
9973 | skb->sk = sk; | |
9974 | skb->destructor = unix_destruct_scm; | |
9975 | refcount_add(skb->truesize, &sk->sk_wmem_alloc); | |
6b06314c JA |
9976 | } |
9977 | ||
73b25d3b PB |
9978 | fpl = UNIXCB(skb).fp; |
9979 | fpl->fp[fpl->count++] = get_file(file); | |
9980 | unix_inflight(fpl->user, file); | |
9981 | skb_queue_head(head, skb); | |
dca58c6a | 9982 | fput(file); |
73b25d3b | 9983 | #endif |
6b06314c JA |
9984 | return 0; |
9985 | } | |
6b06314c | 9986 | |
47e90392 | 9987 | static void io_rsrc_file_put(struct io_ring_ctx *ctx, struct io_rsrc_put *prsrc) |
05f3fb3c | 9988 | { |
50238531 | 9989 | struct file *file = prsrc->file; |
05f3fb3c JA |
9990 | #if defined(CONFIG_UNIX) |
9991 | struct sock *sock = ctx->ring_sock->sk; | |
9992 | struct sk_buff_head list, *head = &sock->sk_receive_queue; | |
9993 | struct sk_buff *skb; | |
9994 | int i; | |
9995 | ||
1f59bc0f PB |
9996 | if (!io_file_need_scm(file)) { |
9997 | fput(file); | |
9998 | return; | |
9999 | } | |
10000 | ||
05f3fb3c JA |
10001 | __skb_queue_head_init(&list); |
10002 | ||
10003 | /* | |
10004 | * Find the skb that holds this file in its SCM_RIGHTS. When found, | |
10005 | * remove this entry and rearrange the file array. | |
10006 | */ | |
10007 | skb = skb_dequeue(head); | |
10008 | while (skb) { | |
10009 | struct scm_fp_list *fp; | |
10010 | ||
10011 | fp = UNIXCB(skb).fp; | |
10012 | for (i = 0; i < fp->count; i++) { | |
10013 | int left; | |
10014 | ||
10015 | if (fp->fp[i] != file) | |
10016 | continue; | |
10017 | ||
10018 | unix_notinflight(fp->user, fp->fp[i]); | |
10019 | left = fp->count - 1 - i; | |
10020 | if (left) { | |
10021 | memmove(&fp->fp[i], &fp->fp[i + 1], | |
10022 | left * sizeof(struct file *)); | |
10023 | } | |
10024 | fp->count--; | |
10025 | if (!fp->count) { | |
10026 | kfree_skb(skb); | |
10027 | skb = NULL; | |
10028 | } else { | |
10029 | __skb_queue_tail(&list, skb); | |
10030 | } | |
10031 | fput(file); | |
10032 | file = NULL; | |
10033 | break; | |
10034 | } | |
10035 | ||
10036 | if (!file) | |
10037 | break; | |
10038 | ||
10039 | __skb_queue_tail(&list, skb); | |
10040 | ||
10041 | skb = skb_dequeue(head); | |
10042 | } | |
10043 | ||
10044 | if (skb_peek(&list)) { | |
10045 | spin_lock_irq(&head->lock); | |
10046 | while ((skb = __skb_dequeue(&list)) != NULL) | |
10047 | __skb_queue_tail(head, skb); | |
10048 | spin_unlock_irq(&head->lock); | |
10049 | } | |
10050 | #else | |
10051 | fput(file); | |
10052 | #endif | |
10053 | } | |
10054 | ||
b895c9a6 | 10055 | static void __io_rsrc_put_work(struct io_rsrc_node *ref_node) |
65e19f54 | 10056 | { |
b895c9a6 | 10057 | struct io_rsrc_data *rsrc_data = ref_node->rsrc_data; |
269bbe5f BM |
10058 | struct io_ring_ctx *ctx = rsrc_data->ctx; |
10059 | struct io_rsrc_put *prsrc, *tmp; | |
05589553 | 10060 | |
269bbe5f BM |
10061 | list_for_each_entry_safe(prsrc, tmp, &ref_node->rsrc_list, list) { |
10062 | list_del(&prsrc->list); | |
b60c8dce PB |
10063 | |
10064 | if (prsrc->tag) { | |
f8929630 PB |
10065 | if (ctx->flags & IORING_SETUP_IOPOLL) |
10066 | mutex_lock(&ctx->uring_lock); | |
b60c8dce | 10067 | |
79ebeaee | 10068 | spin_lock(&ctx->completion_lock); |
913a571a | 10069 | io_fill_cqe_aux(ctx, prsrc->tag, 0, 0); |
b60c8dce | 10070 | io_commit_cqring(ctx); |
79ebeaee | 10071 | spin_unlock(&ctx->completion_lock); |
b60c8dce | 10072 | io_cqring_ev_posted(ctx); |
f8929630 PB |
10073 | |
10074 | if (ctx->flags & IORING_SETUP_IOPOLL) | |
10075 | mutex_unlock(&ctx->uring_lock); | |
b60c8dce PB |
10076 | } |
10077 | ||
40ae0ff7 | 10078 | rsrc_data->do_put(ctx, prsrc); |
269bbe5f | 10079 | kfree(prsrc); |
65e19f54 | 10080 | } |
05589553 | 10081 | |
28a9fe25 | 10082 | io_rsrc_node_destroy(ref_node); |
3e942498 PB |
10083 | if (atomic_dec_and_test(&rsrc_data->refs)) |
10084 | complete(&rsrc_data->done); | |
2faf852d | 10085 | } |
65e19f54 | 10086 | |
269bbe5f | 10087 | static void io_rsrc_put_work(struct work_struct *work) |
4a38aed2 JA |
10088 | { |
10089 | struct io_ring_ctx *ctx; | |
10090 | struct llist_node *node; | |
10091 | ||
269bbe5f BM |
10092 | ctx = container_of(work, struct io_ring_ctx, rsrc_put_work.work); |
10093 | node = llist_del_all(&ctx->rsrc_put_llist); | |
4a38aed2 JA |
10094 | |
10095 | while (node) { | |
b895c9a6 | 10096 | struct io_rsrc_node *ref_node; |
4a38aed2 JA |
10097 | struct llist_node *next = node->next; |
10098 | ||
b895c9a6 | 10099 | ref_node = llist_entry(node, struct io_rsrc_node, llist); |
269bbe5f | 10100 | __io_rsrc_put_work(ref_node); |
4a38aed2 JA |
10101 | node = next; |
10102 | } | |
10103 | } | |
10104 | ||
6b06314c | 10105 | static int io_sqe_files_register(struct io_ring_ctx *ctx, void __user *arg, |
792e3582 | 10106 | unsigned nr_args, u64 __user *tags) |
6b06314c JA |
10107 | { |
10108 | __s32 __user *fds = (__s32 __user *) arg; | |
05f3fb3c | 10109 | struct file *file; |
f3baed39 | 10110 | int fd, ret; |
846a4ef2 | 10111 | unsigned i; |
6b06314c | 10112 | |
05f3fb3c | 10113 | if (ctx->file_data) |
6b06314c JA |
10114 | return -EBUSY; |
10115 | if (!nr_args) | |
10116 | return -EINVAL; | |
10117 | if (nr_args > IORING_MAX_FIXED_FILES) | |
10118 | return -EMFILE; | |
3a1b8a4e PB |
10119 | if (nr_args > rlimit(RLIMIT_NOFILE)) |
10120 | return -EMFILE; | |
a7f0ed5a | 10121 | ret = io_rsrc_node_switch_start(ctx); |
f3baed39 PB |
10122 | if (ret) |
10123 | return ret; | |
d878c816 PB |
10124 | ret = io_rsrc_data_alloc(ctx, io_rsrc_file_put, tags, nr_args, |
10125 | &ctx->file_data); | |
10126 | if (ret) | |
10127 | return ret; | |
6b06314c | 10128 | |
a03a2a20 PB |
10129 | if (!io_alloc_file_tables(&ctx->file_table, nr_args)) { |
10130 | io_rsrc_data_free(ctx->file_data); | |
10131 | ctx->file_data = NULL; | |
10132 | return -ENOMEM; | |
10133 | } | |
65e19f54 | 10134 | |
08a45173 | 10135 | for (i = 0; i < nr_args; i++, ctx->nr_user_files++) { |
a03a2a20 PB |
10136 | struct io_fixed_file *file_slot; |
10137 | ||
a8da73a3 | 10138 | if (fds && copy_from_user(&fd, &fds[i], sizeof(fd))) { |
600cf3f8 | 10139 | ret = -EFAULT; |
a03a2a20 | 10140 | goto fail; |
600cf3f8 | 10141 | } |
08a45173 | 10142 | /* allow sparse sets */ |
a8da73a3 | 10143 | if (!fds || fd == -1) { |
792e3582 | 10144 | ret = -EINVAL; |
2d091d62 | 10145 | if (unlikely(*io_get_tag_slot(ctx->file_data, i))) |
a03a2a20 | 10146 | goto fail; |
08a45173 | 10147 | continue; |
792e3582 | 10148 | } |
6b06314c | 10149 | |
05f3fb3c | 10150 | file = fget(fd); |
6b06314c | 10151 | ret = -EBADF; |
792e3582 | 10152 | if (unlikely(!file)) |
a03a2a20 | 10153 | goto fail; |
05f3fb3c | 10154 | |
6b06314c JA |
10155 | /* |
10156 | * Don't allow io_uring instances to be registered. If UNIX | |
10157 | * isn't enabled, then this causes a reference cycle and this | |
10158 | * instance can never get freed. If UNIX is enabled we'll | |
10159 | * handle it just fine, but there's still no point in allowing | |
10160 | * a ring fd as it doesn't support regular read/write anyway. | |
10161 | */ | |
05f3fb3c JA |
10162 | if (file->f_op == &io_uring_fops) { |
10163 | fput(file); | |
a03a2a20 | 10164 | goto fail; |
6b06314c | 10165 | } |
8b3171bd | 10166 | ret = io_scm_file_account(ctx, file); |
a03a2a20 | 10167 | if (ret) { |
600cf3f8 | 10168 | fput(file); |
a03a2a20 | 10169 | goto fail; |
c3a31e60 | 10170 | } |
e390510a PB |
10171 | file_slot = io_fixed_file_slot(&ctx->file_table, i); |
10172 | io_fixed_file_set(file_slot, file); | |
d78bd8ad | 10173 | io_file_bitmap_set(&ctx->file_table, i); |
c3a31e60 JA |
10174 | } |
10175 | ||
a7f0ed5a | 10176 | io_rsrc_node_switch(ctx, NULL); |
c3a31e60 | 10177 | return 0; |
a03a2a20 PB |
10178 | fail: |
10179 | __io_sqe_files_unregister(ctx); | |
6b06314c | 10180 | return ret; |
c3a31e60 JA |
10181 | } |
10182 | ||
9c7b0ba8 PB |
10183 | static int io_queue_rsrc_removal(struct io_rsrc_data *data, unsigned idx, |
10184 | struct io_rsrc_node *node, void *rsrc) | |
10185 | { | |
8f0a2480 | 10186 | u64 *tag_slot = io_get_tag_slot(data, idx); |
9c7b0ba8 PB |
10187 | struct io_rsrc_put *prsrc; |
10188 | ||
10189 | prsrc = kzalloc(sizeof(*prsrc), GFP_KERNEL); | |
10190 | if (!prsrc) | |
10191 | return -ENOMEM; | |
10192 | ||
8f0a2480 PB |
10193 | prsrc->tag = *tag_slot; |
10194 | *tag_slot = 0; | |
9c7b0ba8 PB |
10195 | prsrc->rsrc = rsrc; |
10196 | list_add(&prsrc->list, &node->rsrc_list); | |
10197 | return 0; | |
10198 | } | |
10199 | ||
b9445598 PB |
10200 | static int io_install_fixed_file(struct io_kiocb *req, struct file *file, |
10201 | unsigned int issue_flags, u32 slot_index) | |
61c1b44a | 10202 | __must_hold(&req->ctx->uring_lock) |
b9445598 PB |
10203 | { |
10204 | struct io_ring_ctx *ctx = req->ctx; | |
9c7b0ba8 | 10205 | bool needs_switch = false; |
b9445598 | 10206 | struct io_fixed_file *file_slot; |
61c1b44a | 10207 | int ret; |
b9445598 | 10208 | |
b9445598 | 10209 | if (file->f_op == &io_uring_fops) |
61c1b44a | 10210 | return -EBADF; |
b9445598 | 10211 | if (!ctx->file_data) |
61c1b44a | 10212 | return -ENXIO; |
b9445598 | 10213 | if (slot_index >= ctx->nr_user_files) |
61c1b44a | 10214 | return -EINVAL; |
b9445598 PB |
10215 | |
10216 | slot_index = array_index_nospec(slot_index, ctx->nr_user_files); | |
10217 | file_slot = io_fixed_file_slot(&ctx->file_table, slot_index); | |
9c7b0ba8 PB |
10218 | |
10219 | if (file_slot->file_ptr) { | |
10220 | struct file *old_file; | |
10221 | ||
10222 | ret = io_rsrc_node_switch_start(ctx); | |
10223 | if (ret) | |
10224 | goto err; | |
10225 | ||
10226 | old_file = (struct file *)(file_slot->file_ptr & FFS_MASK); | |
10227 | ret = io_queue_rsrc_removal(ctx->file_data, slot_index, | |
10228 | ctx->rsrc_node, old_file); | |
10229 | if (ret) | |
10230 | goto err; | |
10231 | file_slot->file_ptr = 0; | |
d78bd8ad | 10232 | io_file_bitmap_clear(&ctx->file_table, slot_index); |
9c7b0ba8 PB |
10233 | needs_switch = true; |
10234 | } | |
b9445598 | 10235 | |
8b3171bd | 10236 | ret = io_scm_file_account(ctx, file); |
e390510a PB |
10237 | if (!ret) { |
10238 | *io_get_tag_slot(ctx->file_data, slot_index) = 0; | |
10239 | io_fixed_file_set(file_slot, file); | |
d78bd8ad | 10240 | io_file_bitmap_set(&ctx->file_table, slot_index); |
b9445598 | 10241 | } |
b9445598 | 10242 | err: |
9c7b0ba8 PB |
10243 | if (needs_switch) |
10244 | io_rsrc_node_switch(ctx, ctx->file_data); | |
b9445598 PB |
10245 | if (ret) |
10246 | fput(file); | |
10247 | return ret; | |
10248 | } | |
10249 | ||
a7c41b46 XW |
10250 | static int __io_close_fixed(struct io_kiocb *req, unsigned int issue_flags, |
10251 | unsigned int offset) | |
7df778be | 10252 | { |
7df778be PB |
10253 | struct io_ring_ctx *ctx = req->ctx; |
10254 | struct io_fixed_file *file_slot; | |
10255 | struct file *file; | |
4cdd158b | 10256 | int ret; |
7df778be | 10257 | |
f8929630 | 10258 | io_ring_submit_lock(ctx, issue_flags); |
7df778be PB |
10259 | ret = -ENXIO; |
10260 | if (unlikely(!ctx->file_data)) | |
10261 | goto out; | |
10262 | ret = -EINVAL; | |
10263 | if (offset >= ctx->nr_user_files) | |
10264 | goto out; | |
10265 | ret = io_rsrc_node_switch_start(ctx); | |
10266 | if (ret) | |
10267 | goto out; | |
10268 | ||
4cdd158b PB |
10269 | offset = array_index_nospec(offset, ctx->nr_user_files); |
10270 | file_slot = io_fixed_file_slot(&ctx->file_table, offset); | |
7df778be PB |
10271 | ret = -EBADF; |
10272 | if (!file_slot->file_ptr) | |
10273 | goto out; | |
10274 | ||
10275 | file = (struct file *)(file_slot->file_ptr & FFS_MASK); | |
10276 | ret = io_queue_rsrc_removal(ctx->file_data, offset, ctx->rsrc_node, file); | |
10277 | if (ret) | |
10278 | goto out; | |
10279 | ||
10280 | file_slot->file_ptr = 0; | |
d78bd8ad | 10281 | io_file_bitmap_clear(&ctx->file_table, offset); |
7df778be PB |
10282 | io_rsrc_node_switch(ctx, ctx->file_data); |
10283 | ret = 0; | |
10284 | out: | |
f8929630 | 10285 | io_ring_submit_unlock(ctx, issue_flags); |
7df778be PB |
10286 | return ret; |
10287 | } | |
10288 | ||
a7c41b46 XW |
10289 | static inline int io_close_fixed(struct io_kiocb *req, unsigned int issue_flags) |
10290 | { | |
10291 | return __io_close_fixed(req, issue_flags, req->close.file_slot - 1); | |
10292 | } | |
10293 | ||
05f3fb3c | 10294 | static int __io_sqe_files_update(struct io_ring_ctx *ctx, |
c3bdad02 | 10295 | struct io_uring_rsrc_update2 *up, |
05f3fb3c JA |
10296 | unsigned nr_args) |
10297 | { | |
c3bdad02 | 10298 | u64 __user *tags = u64_to_user_ptr(up->tags); |
98f0b3b4 | 10299 | __s32 __user *fds = u64_to_user_ptr(up->data); |
b895c9a6 | 10300 | struct io_rsrc_data *data = ctx->file_data; |
a04b0ac0 PB |
10301 | struct io_fixed_file *file_slot; |
10302 | struct file *file; | |
98f0b3b4 PB |
10303 | int fd, i, err = 0; |
10304 | unsigned int done; | |
05589553 | 10305 | bool needs_switch = false; |
c3a31e60 | 10306 | |
98f0b3b4 PB |
10307 | if (!ctx->file_data) |
10308 | return -ENXIO; | |
10309 | if (up->offset + nr_args > ctx->nr_user_files) | |
c3a31e60 JA |
10310 | return -EINVAL; |
10311 | ||
67973b93 | 10312 | for (done = 0; done < nr_args; done++) { |
c3bdad02 PB |
10313 | u64 tag = 0; |
10314 | ||
10315 | if ((tags && copy_from_user(&tag, &tags[done], sizeof(tag))) || | |
10316 | copy_from_user(&fd, &fds[done], sizeof(fd))) { | |
c3a31e60 JA |
10317 | err = -EFAULT; |
10318 | break; | |
10319 | } | |
c3bdad02 PB |
10320 | if ((fd == IORING_REGISTER_FILES_SKIP || fd == -1) && tag) { |
10321 | err = -EINVAL; | |
10322 | break; | |
10323 | } | |
4e0377a1 | 10324 | if (fd == IORING_REGISTER_FILES_SKIP) |
10325 | continue; | |
10326 | ||
67973b93 | 10327 | i = array_index_nospec(up->offset + done, ctx->nr_user_files); |
aeca241b | 10328 | file_slot = io_fixed_file_slot(&ctx->file_table, i); |
ea64ec02 | 10329 | |
a04b0ac0 PB |
10330 | if (file_slot->file_ptr) { |
10331 | file = (struct file *)(file_slot->file_ptr & FFS_MASK); | |
4cdd158b | 10332 | err = io_queue_rsrc_removal(data, i, ctx->rsrc_node, file); |
a5318d3c HD |
10333 | if (err) |
10334 | break; | |
a04b0ac0 | 10335 | file_slot->file_ptr = 0; |
d78bd8ad | 10336 | io_file_bitmap_clear(&ctx->file_table, i); |
05589553 | 10337 | needs_switch = true; |
c3a31e60 JA |
10338 | } |
10339 | if (fd != -1) { | |
c3a31e60 JA |
10340 | file = fget(fd); |
10341 | if (!file) { | |
10342 | err = -EBADF; | |
10343 | break; | |
10344 | } | |
10345 | /* | |
10346 | * Don't allow io_uring instances to be registered. If | |
10347 | * UNIX isn't enabled, then this causes a reference | |
10348 | * cycle and this instance can never get freed. If UNIX | |
10349 | * is enabled we'll handle it just fine, but there's | |
10350 | * still no point in allowing a ring fd as it doesn't | |
10351 | * support regular read/write anyway. | |
10352 | */ | |
10353 | if (file->f_op == &io_uring_fops) { | |
10354 | fput(file); | |
10355 | err = -EBADF; | |
10356 | break; | |
10357 | } | |
8b3171bd | 10358 | err = io_scm_file_account(ctx, file); |
f3bd9dae YY |
10359 | if (err) { |
10360 | fput(file); | |
c3a31e60 | 10361 | break; |
f3bd9dae | 10362 | } |
e390510a PB |
10363 | *io_get_tag_slot(data, i) = tag; |
10364 | io_fixed_file_set(file_slot, file); | |
d78bd8ad | 10365 | io_file_bitmap_set(&ctx->file_table, i); |
c3a31e60 | 10366 | } |
05f3fb3c JA |
10367 | } |
10368 | ||
a7f0ed5a PB |
10369 | if (needs_switch) |
10370 | io_rsrc_node_switch(ctx, data); | |
c3a31e60 JA |
10371 | return done ? done : err; |
10372 | } | |
05589553 | 10373 | |
685fe7fe JA |
10374 | static struct io_wq *io_init_wq_offload(struct io_ring_ctx *ctx, |
10375 | struct task_struct *task) | |
24369c2e | 10376 | { |
e941894e | 10377 | struct io_wq_hash *hash; |
24369c2e | 10378 | struct io_wq_data data; |
24369c2e | 10379 | unsigned int concurrency; |
24369c2e | 10380 | |
362a9e65 | 10381 | mutex_lock(&ctx->uring_lock); |
e941894e JA |
10382 | hash = ctx->hash_map; |
10383 | if (!hash) { | |
10384 | hash = kzalloc(sizeof(*hash), GFP_KERNEL); | |
362a9e65 YY |
10385 | if (!hash) { |
10386 | mutex_unlock(&ctx->uring_lock); | |
e941894e | 10387 | return ERR_PTR(-ENOMEM); |
362a9e65 | 10388 | } |
e941894e JA |
10389 | refcount_set(&hash->refs, 1); |
10390 | init_waitqueue_head(&hash->wait); | |
10391 | ctx->hash_map = hash; | |
24369c2e | 10392 | } |
362a9e65 | 10393 | mutex_unlock(&ctx->uring_lock); |
24369c2e | 10394 | |
e941894e | 10395 | data.hash = hash; |
685fe7fe | 10396 | data.task = task; |
ebc11b6c | 10397 | data.free_work = io_wq_free_work; |
f5fa38c5 | 10398 | data.do_work = io_wq_submit_work; |
24369c2e | 10399 | |
d25e3a3d JA |
10400 | /* Do QD, or 4 * CPUS, whatever is smallest */ |
10401 | concurrency = min(ctx->sq_entries, 4 * num_online_cpus()); | |
24369c2e | 10402 | |
5aa75ed5 | 10403 | return io_wq_create(concurrency, &data); |
24369c2e PB |
10404 | } |
10405 | ||
c072481d PB |
10406 | static __cold int io_uring_alloc_task_context(struct task_struct *task, |
10407 | struct io_ring_ctx *ctx) | |
0f212204 JA |
10408 | { |
10409 | struct io_uring_task *tctx; | |
d8a6df10 | 10410 | int ret; |
0f212204 | 10411 | |
09899b19 | 10412 | tctx = kzalloc(sizeof(*tctx), GFP_KERNEL); |
0f212204 JA |
10413 | if (unlikely(!tctx)) |
10414 | return -ENOMEM; | |
10415 | ||
e7a6c00d JA |
10416 | tctx->registered_rings = kcalloc(IO_RINGFD_REG_MAX, |
10417 | sizeof(struct file *), GFP_KERNEL); | |
10418 | if (unlikely(!tctx->registered_rings)) { | |
10419 | kfree(tctx); | |
10420 | return -ENOMEM; | |
10421 | } | |
10422 | ||
d8a6df10 JA |
10423 | ret = percpu_counter_init(&tctx->inflight, 0, GFP_KERNEL); |
10424 | if (unlikely(ret)) { | |
e7a6c00d | 10425 | kfree(tctx->registered_rings); |
d8a6df10 JA |
10426 | kfree(tctx); |
10427 | return ret; | |
10428 | } | |
10429 | ||
685fe7fe | 10430 | tctx->io_wq = io_init_wq_offload(ctx, task); |
5aa75ed5 JA |
10431 | if (IS_ERR(tctx->io_wq)) { |
10432 | ret = PTR_ERR(tctx->io_wq); | |
10433 | percpu_counter_destroy(&tctx->inflight); | |
e7a6c00d | 10434 | kfree(tctx->registered_rings); |
5aa75ed5 JA |
10435 | kfree(tctx); |
10436 | return ret; | |
10437 | } | |
10438 | ||
0f212204 JA |
10439 | xa_init(&tctx->xa); |
10440 | init_waitqueue_head(&tctx->wait); | |
fdaf083c | 10441 | atomic_set(&tctx->in_idle, 0); |
9cae36a0 | 10442 | atomic_set(&tctx->inflight_tracked, 0); |
0f212204 | 10443 | task->io_uring = tctx; |
7cbf1722 JA |
10444 | spin_lock_init(&tctx->task_lock); |
10445 | INIT_WQ_LIST(&tctx->task_list); | |
3fe07bcd | 10446 | INIT_WQ_LIST(&tctx->prio_task_list); |
7cbf1722 | 10447 | init_task_work(&tctx->task_work, tctx_task_work); |
0f212204 JA |
10448 | return 0; |
10449 | } | |
10450 | ||
10451 | void __io_uring_free(struct task_struct *tsk) | |
10452 | { | |
10453 | struct io_uring_task *tctx = tsk->io_uring; | |
10454 | ||
10455 | WARN_ON_ONCE(!xa_empty(&tctx->xa)); | |
ef8eaa4e | 10456 | WARN_ON_ONCE(tctx->io_wq); |
09899b19 | 10457 | WARN_ON_ONCE(tctx->cached_refs); |
ef8eaa4e | 10458 | |
e7a6c00d | 10459 | kfree(tctx->registered_rings); |
d8a6df10 | 10460 | percpu_counter_destroy(&tctx->inflight); |
0f212204 JA |
10461 | kfree(tctx); |
10462 | tsk->io_uring = NULL; | |
10463 | } | |
10464 | ||
c072481d PB |
10465 | static __cold int io_sq_offload_create(struct io_ring_ctx *ctx, |
10466 | struct io_uring_params *p) | |
2b188cc1 JA |
10467 | { |
10468 | int ret; | |
10469 | ||
d25e3a3d JA |
10470 | /* Retain compatibility with failing for an invalid attach attempt */ |
10471 | if ((ctx->flags & (IORING_SETUP_ATTACH_WQ | IORING_SETUP_SQPOLL)) == | |
10472 | IORING_SETUP_ATTACH_WQ) { | |
10473 | struct fd f; | |
10474 | ||
10475 | f = fdget(p->wq_fd); | |
10476 | if (!f.file) | |
10477 | return -ENXIO; | |
0cc936f7 JA |
10478 | if (f.file->f_op != &io_uring_fops) { |
10479 | fdput(f); | |
f2a48dd0 | 10480 | return -EINVAL; |
0cc936f7 JA |
10481 | } |
10482 | fdput(f); | |
d25e3a3d | 10483 | } |
6c271ce2 | 10484 | if (ctx->flags & IORING_SETUP_SQPOLL) { |
46fe18b1 | 10485 | struct task_struct *tsk; |
534ca6d6 | 10486 | struct io_sq_data *sqd; |
26984fbf | 10487 | bool attached; |
534ca6d6 | 10488 | |
cdc1404a PM |
10489 | ret = security_uring_sqpoll(); |
10490 | if (ret) | |
10491 | return ret; | |
10492 | ||
26984fbf | 10493 | sqd = io_get_sq_data(p, &attached); |
534ca6d6 JA |
10494 | if (IS_ERR(sqd)) { |
10495 | ret = PTR_ERR(sqd); | |
10496 | goto err; | |
10497 | } | |
69fb2131 | 10498 | |
7c30f36a | 10499 | ctx->sq_creds = get_current_cred(); |
534ca6d6 | 10500 | ctx->sq_data = sqd; |
917257da JA |
10501 | ctx->sq_thread_idle = msecs_to_jiffies(p->sq_thread_idle); |
10502 | if (!ctx->sq_thread_idle) | |
10503 | ctx->sq_thread_idle = HZ; | |
10504 | ||
78d7f6ba | 10505 | io_sq_thread_park(sqd); |
de75a3d3 PB |
10506 | list_add(&ctx->sqd_list, &sqd->ctx_list); |
10507 | io_sqd_update_thread_idle(sqd); | |
26984fbf | 10508 | /* don't attach to a dying SQPOLL thread, would be racy */ |
f2a48dd0 | 10509 | ret = (attached && !sqd->thread) ? -ENXIO : 0; |
78d7f6ba PB |
10510 | io_sq_thread_unpark(sqd); |
10511 | ||
de75a3d3 PB |
10512 | if (ret < 0) |
10513 | goto err; | |
10514 | if (attached) | |
5aa75ed5 | 10515 | return 0; |
aa06165d | 10516 | |
6c271ce2 | 10517 | if (p->flags & IORING_SETUP_SQ_AFF) { |
44a9bd18 | 10518 | int cpu = p->sq_thread_cpu; |
6c271ce2 | 10519 | |
917257da | 10520 | ret = -EINVAL; |
f2a48dd0 | 10521 | if (cpu >= nr_cpu_ids || !cpu_online(cpu)) |
e8f98f24 | 10522 | goto err_sqpoll; |
37d1e2e3 | 10523 | sqd->sq_cpu = cpu; |
6c271ce2 | 10524 | } else { |
37d1e2e3 | 10525 | sqd->sq_cpu = -1; |
6c271ce2 | 10526 | } |
37d1e2e3 JA |
10527 | |
10528 | sqd->task_pid = current->pid; | |
5c2469e0 | 10529 | sqd->task_tgid = current->tgid; |
46fe18b1 JA |
10530 | tsk = create_io_thread(io_sq_thread, sqd, NUMA_NO_NODE); |
10531 | if (IS_ERR(tsk)) { | |
10532 | ret = PTR_ERR(tsk); | |
e8f98f24 | 10533 | goto err_sqpoll; |
6c271ce2 | 10534 | } |
97a73a0f | 10535 | |
46fe18b1 | 10536 | sqd->thread = tsk; |
97a73a0f | 10537 | ret = io_uring_alloc_task_context(tsk, ctx); |
46fe18b1 | 10538 | wake_up_new_task(tsk); |
0f212204 JA |
10539 | if (ret) |
10540 | goto err; | |
6c271ce2 JA |
10541 | } else if (p->flags & IORING_SETUP_SQ_AFF) { |
10542 | /* Can't have SQ_AFF without SQPOLL */ | |
10543 | ret = -EINVAL; | |
10544 | goto err; | |
10545 | } | |
10546 | ||
2b188cc1 | 10547 | return 0; |
f2a48dd0 PB |
10548 | err_sqpoll: |
10549 | complete(&ctx->sq_data->exited); | |
2b188cc1 | 10550 | err: |
37d1e2e3 | 10551 | io_sq_thread_finish(ctx); |
2b188cc1 JA |
10552 | return ret; |
10553 | } | |
10554 | ||
a087e2b5 BM |
10555 | static inline void __io_unaccount_mem(struct user_struct *user, |
10556 | unsigned long nr_pages) | |
2b188cc1 JA |
10557 | { |
10558 | atomic_long_sub(nr_pages, &user->locked_vm); | |
10559 | } | |
10560 | ||
a087e2b5 BM |
10561 | static inline int __io_account_mem(struct user_struct *user, |
10562 | unsigned long nr_pages) | |
2b188cc1 JA |
10563 | { |
10564 | unsigned long page_limit, cur_pages, new_pages; | |
10565 | ||
10566 | /* Don't allow more pages than we can safely lock */ | |
10567 | page_limit = rlimit(RLIMIT_MEMLOCK) >> PAGE_SHIFT; | |
10568 | ||
10569 | do { | |
10570 | cur_pages = atomic_long_read(&user->locked_vm); | |
10571 | new_pages = cur_pages + nr_pages; | |
10572 | if (new_pages > page_limit) | |
10573 | return -ENOMEM; | |
10574 | } while (atomic_long_cmpxchg(&user->locked_vm, cur_pages, | |
10575 | new_pages) != cur_pages); | |
10576 | ||
10577 | return 0; | |
10578 | } | |
10579 | ||
26bfa89e | 10580 | static void io_unaccount_mem(struct io_ring_ctx *ctx, unsigned long nr_pages) |
a087e2b5 | 10581 | { |
62e398be | 10582 | if (ctx->user) |
a087e2b5 | 10583 | __io_unaccount_mem(ctx->user, nr_pages); |
30975825 | 10584 | |
26bfa89e JA |
10585 | if (ctx->mm_account) |
10586 | atomic64_sub(nr_pages, &ctx->mm_account->pinned_vm); | |
a087e2b5 BM |
10587 | } |
10588 | ||
26bfa89e | 10589 | static int io_account_mem(struct io_ring_ctx *ctx, unsigned long nr_pages) |
a087e2b5 | 10590 | { |
30975825 BM |
10591 | int ret; |
10592 | ||
62e398be | 10593 | if (ctx->user) { |
30975825 BM |
10594 | ret = __io_account_mem(ctx->user, nr_pages); |
10595 | if (ret) | |
10596 | return ret; | |
10597 | } | |
10598 | ||
26bfa89e JA |
10599 | if (ctx->mm_account) |
10600 | atomic64_add(nr_pages, &ctx->mm_account->pinned_vm); | |
a087e2b5 BM |
10601 | |
10602 | return 0; | |
10603 | } | |
10604 | ||
2b188cc1 JA |
10605 | static void io_mem_free(void *ptr) |
10606 | { | |
52e04ef4 MR |
10607 | struct page *page; |
10608 | ||
10609 | if (!ptr) | |
10610 | return; | |
2b188cc1 | 10611 | |
52e04ef4 | 10612 | page = virt_to_head_page(ptr); |
2b188cc1 JA |
10613 | if (put_page_testzero(page)) |
10614 | free_compound_page(page); | |
10615 | } | |
10616 | ||
10617 | static void *io_mem_alloc(size_t size) | |
10618 | { | |
0a3f1e0b | 10619 | gfp_t gfp = GFP_KERNEL_ACCOUNT | __GFP_ZERO | __GFP_NOWARN | __GFP_COMP; |
2b188cc1 | 10620 | |
0a3f1e0b | 10621 | return (void *) __get_free_pages(gfp, get_order(size)); |
2b188cc1 JA |
10622 | } |
10623 | ||
baf9cb64 SR |
10624 | static unsigned long rings_size(struct io_ring_ctx *ctx, unsigned int sq_entries, |
10625 | unsigned int cq_entries, size_t *sq_offset) | |
75b28aff HV |
10626 | { |
10627 | struct io_rings *rings; | |
10628 | size_t off, sq_array_size; | |
10629 | ||
10630 | off = struct_size(rings, cqes, cq_entries); | |
10631 | if (off == SIZE_MAX) | |
10632 | return SIZE_MAX; | |
baf9cb64 SR |
10633 | if (ctx->flags & IORING_SETUP_CQE32) { |
10634 | if (check_shl_overflow(off, 1, &off)) | |
10635 | return SIZE_MAX; | |
10636 | } | |
75b28aff HV |
10637 | |
10638 | #ifdef CONFIG_SMP | |
10639 | off = ALIGN(off, SMP_CACHE_BYTES); | |
10640 | if (off == 0) | |
10641 | return SIZE_MAX; | |
10642 | #endif | |
10643 | ||
b36200f5 DV |
10644 | if (sq_offset) |
10645 | *sq_offset = off; | |
10646 | ||
75b28aff HV |
10647 | sq_array_size = array_size(sizeof(u32), sq_entries); |
10648 | if (sq_array_size == SIZE_MAX) | |
10649 | return SIZE_MAX; | |
10650 | ||
10651 | if (check_add_overflow(off, sq_array_size, &off)) | |
10652 | return SIZE_MAX; | |
10653 | ||
75b28aff HV |
10654 | return off; |
10655 | } | |
10656 | ||
41edf1a5 | 10657 | static void io_buffer_unmap(struct io_ring_ctx *ctx, struct io_mapped_ubuf **slot) |
7f61a1e9 | 10658 | { |
41edf1a5 | 10659 | struct io_mapped_ubuf *imu = *slot; |
7f61a1e9 PB |
10660 | unsigned int i; |
10661 | ||
6224843d PB |
10662 | if (imu != ctx->dummy_ubuf) { |
10663 | for (i = 0; i < imu->nr_bvecs; i++) | |
10664 | unpin_user_page(imu->bvec[i].bv_page); | |
10665 | if (imu->acct_pages) | |
10666 | io_unaccount_mem(ctx, imu->acct_pages); | |
10667 | kvfree(imu); | |
10668 | } | |
41edf1a5 | 10669 | *slot = NULL; |
7f61a1e9 PB |
10670 | } |
10671 | ||
bd54b6fe | 10672 | static void io_rsrc_buf_put(struct io_ring_ctx *ctx, struct io_rsrc_put *prsrc) |
edafccee | 10673 | { |
634d00df PB |
10674 | io_buffer_unmap(ctx, &prsrc->buf); |
10675 | prsrc->buf = NULL; | |
bd54b6fe | 10676 | } |
edafccee | 10677 | |
bd54b6fe BM |
10678 | static void __io_sqe_buffers_unregister(struct io_ring_ctx *ctx) |
10679 | { | |
10680 | unsigned int i; | |
edafccee | 10681 | |
7f61a1e9 PB |
10682 | for (i = 0; i < ctx->nr_user_bufs; i++) |
10683 | io_buffer_unmap(ctx, &ctx->user_bufs[i]); | |
edafccee | 10684 | kfree(ctx->user_bufs); |
bb6659cc | 10685 | io_rsrc_data_free(ctx->buf_data); |
edafccee | 10686 | ctx->user_bufs = NULL; |
bd54b6fe | 10687 | ctx->buf_data = NULL; |
edafccee | 10688 | ctx->nr_user_bufs = 0; |
bd54b6fe BM |
10689 | } |
10690 | ||
0a96bbe4 | 10691 | static int io_sqe_buffers_unregister(struct io_ring_ctx *ctx) |
edafccee | 10692 | { |
bd54b6fe | 10693 | int ret; |
edafccee | 10694 | |
bd54b6fe | 10695 | if (!ctx->buf_data) |
edafccee JA |
10696 | return -ENXIO; |
10697 | ||
bd54b6fe BM |
10698 | ret = io_rsrc_ref_quiesce(ctx->buf_data, ctx); |
10699 | if (!ret) | |
10700 | __io_sqe_buffers_unregister(ctx); | |
10701 | return ret; | |
edafccee JA |
10702 | } |
10703 | ||
10704 | static int io_copy_iov(struct io_ring_ctx *ctx, struct iovec *dst, | |
10705 | void __user *arg, unsigned index) | |
10706 | { | |
10707 | struct iovec __user *src; | |
10708 | ||
10709 | #ifdef CONFIG_COMPAT | |
10710 | if (ctx->compat) { | |
10711 | struct compat_iovec __user *ciovs; | |
10712 | struct compat_iovec ciov; | |
10713 | ||
10714 | ciovs = (struct compat_iovec __user *) arg; | |
10715 | if (copy_from_user(&ciov, &ciovs[index], sizeof(ciov))) | |
10716 | return -EFAULT; | |
10717 | ||
d55e5f5b | 10718 | dst->iov_base = u64_to_user_ptr((u64)ciov.iov_base); |
edafccee JA |
10719 | dst->iov_len = ciov.iov_len; |
10720 | return 0; | |
10721 | } | |
10722 | #endif | |
10723 | src = (struct iovec __user *) arg; | |
10724 | if (copy_from_user(dst, &src[index], sizeof(*dst))) | |
10725 | return -EFAULT; | |
10726 | return 0; | |
10727 | } | |
10728 | ||
de293938 JA |
10729 | /* |
10730 | * Not super efficient, but this is just a registration time. And we do cache | |
10731 | * the last compound head, so generally we'll only do a full search if we don't | |
10732 | * match that one. | |
10733 | * | |
10734 | * We check if the given compound head page has already been accounted, to | |
10735 | * avoid double accounting it. This allows us to account the full size of the | |
10736 | * page, not just the constituent pages of a huge page. | |
10737 | */ | |
10738 | static bool headpage_already_acct(struct io_ring_ctx *ctx, struct page **pages, | |
10739 | int nr_pages, struct page *hpage) | |
10740 | { | |
10741 | int i, j; | |
10742 | ||
10743 | /* check current page array */ | |
10744 | for (i = 0; i < nr_pages; i++) { | |
10745 | if (!PageCompound(pages[i])) | |
10746 | continue; | |
10747 | if (compound_head(pages[i]) == hpage) | |
10748 | return true; | |
10749 | } | |
10750 | ||
10751 | /* check previously registered pages */ | |
10752 | for (i = 0; i < ctx->nr_user_bufs; i++) { | |
41edf1a5 | 10753 | struct io_mapped_ubuf *imu = ctx->user_bufs[i]; |
de293938 JA |
10754 | |
10755 | for (j = 0; j < imu->nr_bvecs; j++) { | |
10756 | if (!PageCompound(imu->bvec[j].bv_page)) | |
10757 | continue; | |
10758 | if (compound_head(imu->bvec[j].bv_page) == hpage) | |
10759 | return true; | |
10760 | } | |
10761 | } | |
10762 | ||
10763 | return false; | |
10764 | } | |
10765 | ||
10766 | static int io_buffer_account_pin(struct io_ring_ctx *ctx, struct page **pages, | |
10767 | int nr_pages, struct io_mapped_ubuf *imu, | |
10768 | struct page **last_hpage) | |
10769 | { | |
10770 | int i, ret; | |
10771 | ||
216e5835 | 10772 | imu->acct_pages = 0; |
de293938 JA |
10773 | for (i = 0; i < nr_pages; i++) { |
10774 | if (!PageCompound(pages[i])) { | |
10775 | imu->acct_pages++; | |
10776 | } else { | |
10777 | struct page *hpage; | |
10778 | ||
10779 | hpage = compound_head(pages[i]); | |
10780 | if (hpage == *last_hpage) | |
10781 | continue; | |
10782 | *last_hpage = hpage; | |
10783 | if (headpage_already_acct(ctx, pages, i, hpage)) | |
10784 | continue; | |
10785 | imu->acct_pages += page_size(hpage) >> PAGE_SHIFT; | |
10786 | } | |
10787 | } | |
10788 | ||
10789 | if (!imu->acct_pages) | |
10790 | return 0; | |
10791 | ||
26bfa89e | 10792 | ret = io_account_mem(ctx, imu->acct_pages); |
de293938 JA |
10793 | if (ret) |
10794 | imu->acct_pages = 0; | |
10795 | return ret; | |
10796 | } | |
10797 | ||
d8c2237d JA |
10798 | static struct page **io_pin_pages(unsigned long ubuf, unsigned long len, |
10799 | int *npages) | |
edafccee | 10800 | { |
d8c2237d | 10801 | unsigned long start, end, nr_pages; |
edafccee JA |
10802 | struct vm_area_struct **vmas = NULL; |
10803 | struct page **pages = NULL; | |
d8c2237d | 10804 | int i, pret, ret = -ENOMEM; |
6224843d | 10805 | |
d8c2237d | 10806 | end = (ubuf + len + PAGE_SIZE - 1) >> PAGE_SHIFT; |
0a96bbe4 BM |
10807 | start = ubuf >> PAGE_SHIFT; |
10808 | nr_pages = end - start; | |
10809 | ||
0a96bbe4 BM |
10810 | pages = kvmalloc_array(nr_pages, sizeof(struct page *), GFP_KERNEL); |
10811 | if (!pages) | |
10812 | goto done; | |
10813 | ||
10814 | vmas = kvmalloc_array(nr_pages, sizeof(struct vm_area_struct *), | |
10815 | GFP_KERNEL); | |
10816 | if (!vmas) | |
10817 | goto done; | |
edafccee | 10818 | |
0a96bbe4 BM |
10819 | ret = 0; |
10820 | mmap_read_lock(current->mm); | |
10821 | pret = pin_user_pages(ubuf, nr_pages, FOLL_WRITE | FOLL_LONGTERM, | |
10822 | pages, vmas); | |
10823 | if (pret == nr_pages) { | |
10824 | /* don't support file backed memory */ | |
10825 | for (i = 0; i < nr_pages; i++) { | |
10826 | struct vm_area_struct *vma = vmas[i]; | |
10827 | ||
40dad765 PB |
10828 | if (vma_is_shmem(vma)) |
10829 | continue; | |
0a96bbe4 BM |
10830 | if (vma->vm_file && |
10831 | !is_file_hugepages(vma->vm_file)) { | |
10832 | ret = -EOPNOTSUPP; | |
10833 | break; | |
10834 | } | |
10835 | } | |
d8c2237d | 10836 | *npages = nr_pages; |
0a96bbe4 BM |
10837 | } else { |
10838 | ret = pret < 0 ? pret : -EFAULT; | |
10839 | } | |
10840 | mmap_read_unlock(current->mm); | |
10841 | if (ret) { | |
10842 | /* | |
10843 | * if we did partial map, or found file backed vmas, | |
10844 | * release any pages we did get | |
10845 | */ | |
10846 | if (pret > 0) | |
10847 | unpin_user_pages(pages, pret); | |
0a96bbe4 BM |
10848 | goto done; |
10849 | } | |
d8c2237d JA |
10850 | ret = 0; |
10851 | done: | |
10852 | kvfree(vmas); | |
10853 | if (ret < 0) { | |
10854 | kvfree(pages); | |
10855 | pages = ERR_PTR(ret); | |
10856 | } | |
10857 | return pages; | |
10858 | } | |
0a96bbe4 | 10859 | |
d8c2237d JA |
10860 | static int io_sqe_buffer_register(struct io_ring_ctx *ctx, struct iovec *iov, |
10861 | struct io_mapped_ubuf **pimu, | |
10862 | struct page **last_hpage) | |
10863 | { | |
10864 | struct io_mapped_ubuf *imu = NULL; | |
10865 | struct page **pages = NULL; | |
10866 | unsigned long off; | |
10867 | size_t size; | |
10868 | int ret, nr_pages, i; | |
10869 | ||
10870 | if (!iov->iov_base) { | |
10871 | *pimu = ctx->dummy_ubuf; | |
10872 | return 0; | |
10873 | } | |
10874 | ||
10875 | *pimu = NULL; | |
10876 | ret = -ENOMEM; | |
10877 | ||
10878 | pages = io_pin_pages((unsigned long) iov->iov_base, iov->iov_len, | |
10879 | &nr_pages); | |
10880 | if (IS_ERR(pages)) { | |
10881 | ret = PTR_ERR(pages); | |
10882 | pages = NULL; | |
10883 | goto done; | |
10884 | } | |
10885 | ||
10886 | imu = kvmalloc(struct_size(imu, bvec, nr_pages), GFP_KERNEL); | |
10887 | if (!imu) | |
10888 | goto done; | |
0a96bbe4 | 10889 | |
d8c2237d | 10890 | ret = io_buffer_account_pin(ctx, pages, nr_pages, imu, last_hpage); |
0a96bbe4 | 10891 | if (ret) { |
d8c2237d | 10892 | unpin_user_pages(pages, nr_pages); |
0a96bbe4 BM |
10893 | goto done; |
10894 | } | |
10895 | ||
d8c2237d | 10896 | off = (unsigned long) iov->iov_base & ~PAGE_MASK; |
0a96bbe4 BM |
10897 | size = iov->iov_len; |
10898 | for (i = 0; i < nr_pages; i++) { | |
10899 | size_t vec_len; | |
10900 | ||
10901 | vec_len = min_t(size_t, size, PAGE_SIZE - off); | |
10902 | imu->bvec[i].bv_page = pages[i]; | |
10903 | imu->bvec[i].bv_len = vec_len; | |
10904 | imu->bvec[i].bv_offset = off; | |
10905 | off = 0; | |
10906 | size -= vec_len; | |
10907 | } | |
10908 | /* store original address for later verification */ | |
d8c2237d JA |
10909 | imu->ubuf = (unsigned long) iov->iov_base; |
10910 | imu->ubuf_end = imu->ubuf + iov->iov_len; | |
0a96bbe4 | 10911 | imu->nr_bvecs = nr_pages; |
41edf1a5 | 10912 | *pimu = imu; |
0a96bbe4 BM |
10913 | ret = 0; |
10914 | done: | |
41edf1a5 PB |
10915 | if (ret) |
10916 | kvfree(imu); | |
0a96bbe4 | 10917 | kvfree(pages); |
0a96bbe4 BM |
10918 | return ret; |
10919 | } | |
10920 | ||
2b358604 | 10921 | static int io_buffers_map_alloc(struct io_ring_ctx *ctx, unsigned int nr_args) |
0a96bbe4 | 10922 | { |
87094465 PB |
10923 | ctx->user_bufs = kcalloc(nr_args, sizeof(*ctx->user_bufs), GFP_KERNEL); |
10924 | return ctx->user_bufs ? 0 : -ENOMEM; | |
2b358604 | 10925 | } |
edafccee | 10926 | |
2b358604 BM |
10927 | static int io_buffer_validate(struct iovec *iov) |
10928 | { | |
50e96989 PB |
10929 | unsigned long tmp, acct_len = iov->iov_len + (PAGE_SIZE - 1); |
10930 | ||
2b358604 BM |
10931 | /* |
10932 | * Don't impose further limits on the size and buffer | |
10933 | * constraints here, we'll -EINVAL later when IO is | |
10934 | * submitted if they are wrong. | |
10935 | */ | |
6224843d PB |
10936 | if (!iov->iov_base) |
10937 | return iov->iov_len ? -EFAULT : 0; | |
10938 | if (!iov->iov_len) | |
2b358604 | 10939 | return -EFAULT; |
edafccee | 10940 | |
2b358604 BM |
10941 | /* arbitrary limit, but we need something */ |
10942 | if (iov->iov_len > SZ_1G) | |
10943 | return -EFAULT; | |
edafccee | 10944 | |
50e96989 PB |
10945 | if (check_add_overflow((unsigned long)iov->iov_base, acct_len, &tmp)) |
10946 | return -EOVERFLOW; | |
10947 | ||
2b358604 BM |
10948 | return 0; |
10949 | } | |
edafccee | 10950 | |
2b358604 | 10951 | static int io_sqe_buffers_register(struct io_ring_ctx *ctx, void __user *arg, |
634d00df | 10952 | unsigned int nr_args, u64 __user *tags) |
2b358604 | 10953 | { |
bd54b6fe BM |
10954 | struct page *last_hpage = NULL; |
10955 | struct io_rsrc_data *data; | |
2b358604 BM |
10956 | int i, ret; |
10957 | struct iovec iov; | |
edafccee | 10958 | |
87094465 PB |
10959 | if (ctx->user_bufs) |
10960 | return -EBUSY; | |
489809e2 | 10961 | if (!nr_args || nr_args > IORING_MAX_REG_BUFFERS) |
87094465 | 10962 | return -EINVAL; |
bd54b6fe | 10963 | ret = io_rsrc_node_switch_start(ctx); |
2b358604 BM |
10964 | if (ret) |
10965 | return ret; | |
d878c816 PB |
10966 | ret = io_rsrc_data_alloc(ctx, io_rsrc_buf_put, tags, nr_args, &data); |
10967 | if (ret) | |
10968 | return ret; | |
bd54b6fe BM |
10969 | ret = io_buffers_map_alloc(ctx, nr_args); |
10970 | if (ret) { | |
bb6659cc | 10971 | io_rsrc_data_free(data); |
bd54b6fe BM |
10972 | return ret; |
10973 | } | |
edafccee | 10974 | |
87094465 | 10975 | for (i = 0; i < nr_args; i++, ctx->nr_user_bufs++) { |
0184f08e PB |
10976 | if (arg) { |
10977 | ret = io_copy_iov(ctx, &iov, arg, i); | |
10978 | if (ret) | |
10979 | break; | |
10980 | ret = io_buffer_validate(&iov); | |
10981 | if (ret) | |
10982 | break; | |
10983 | } else { | |
10984 | memset(&iov, 0, sizeof(iov)); | |
10985 | } | |
10986 | ||
2d091d62 | 10987 | if (!iov.iov_base && *io_get_tag_slot(data, i)) { |
cf3770e7 CIK |
10988 | ret = -EINVAL; |
10989 | break; | |
10990 | } | |
edafccee | 10991 | |
41edf1a5 PB |
10992 | ret = io_sqe_buffer_register(ctx, &iov, &ctx->user_bufs[i], |
10993 | &last_hpage); | |
0a96bbe4 BM |
10994 | if (ret) |
10995 | break; | |
edafccee | 10996 | } |
0a96bbe4 | 10997 | |
bd54b6fe | 10998 | WARN_ON_ONCE(ctx->buf_data); |
0a96bbe4 | 10999 | |
bd54b6fe BM |
11000 | ctx->buf_data = data; |
11001 | if (ret) | |
11002 | __io_sqe_buffers_unregister(ctx); | |
11003 | else | |
11004 | io_rsrc_node_switch(ctx, NULL); | |
edafccee JA |
11005 | return ret; |
11006 | } | |
11007 | ||
634d00df PB |
11008 | static int __io_sqe_buffers_update(struct io_ring_ctx *ctx, |
11009 | struct io_uring_rsrc_update2 *up, | |
11010 | unsigned int nr_args) | |
11011 | { | |
11012 | u64 __user *tags = u64_to_user_ptr(up->tags); | |
11013 | struct iovec iov, __user *iovs = u64_to_user_ptr(up->data); | |
634d00df PB |
11014 | struct page *last_hpage = NULL; |
11015 | bool needs_switch = false; | |
11016 | __u32 done; | |
11017 | int i, err; | |
11018 | ||
11019 | if (!ctx->buf_data) | |
11020 | return -ENXIO; | |
11021 | if (up->offset + nr_args > ctx->nr_user_bufs) | |
11022 | return -EINVAL; | |
11023 | ||
11024 | for (done = 0; done < nr_args; done++) { | |
0b8c0e7c PB |
11025 | struct io_mapped_ubuf *imu; |
11026 | int offset = up->offset + done; | |
634d00df PB |
11027 | u64 tag = 0; |
11028 | ||
11029 | err = io_copy_iov(ctx, &iov, iovs, done); | |
11030 | if (err) | |
11031 | break; | |
11032 | if (tags && copy_from_user(&tag, &tags[done], sizeof(tag))) { | |
11033 | err = -EFAULT; | |
11034 | break; | |
11035 | } | |
0b8c0e7c PB |
11036 | err = io_buffer_validate(&iov); |
11037 | if (err) | |
11038 | break; | |
cf3770e7 CIK |
11039 | if (!iov.iov_base && tag) { |
11040 | err = -EINVAL; | |
11041 | break; | |
11042 | } | |
0b8c0e7c PB |
11043 | err = io_sqe_buffer_register(ctx, &iov, &imu, &last_hpage); |
11044 | if (err) | |
11045 | break; | |
634d00df | 11046 | |
0b8c0e7c | 11047 | i = array_index_nospec(offset, ctx->nr_user_bufs); |
6224843d | 11048 | if (ctx->user_bufs[i] != ctx->dummy_ubuf) { |
4cdd158b | 11049 | err = io_queue_rsrc_removal(ctx->buf_data, i, |
0b8c0e7c PB |
11050 | ctx->rsrc_node, ctx->user_bufs[i]); |
11051 | if (unlikely(err)) { | |
11052 | io_buffer_unmap(ctx, &imu); | |
634d00df | 11053 | break; |
0b8c0e7c | 11054 | } |
634d00df PB |
11055 | ctx->user_bufs[i] = NULL; |
11056 | needs_switch = true; | |
11057 | } | |
11058 | ||
0b8c0e7c | 11059 | ctx->user_bufs[i] = imu; |
2d091d62 | 11060 | *io_get_tag_slot(ctx->buf_data, offset) = tag; |
634d00df PB |
11061 | } |
11062 | ||
11063 | if (needs_switch) | |
11064 | io_rsrc_node_switch(ctx, ctx->buf_data); | |
11065 | return done ? done : err; | |
11066 | } | |
11067 | ||
c75312dd UA |
11068 | static int io_eventfd_register(struct io_ring_ctx *ctx, void __user *arg, |
11069 | unsigned int eventfd_async) | |
9b402849 | 11070 | { |
77bc59b4 | 11071 | struct io_ev_fd *ev_fd; |
9b402849 | 11072 | __s32 __user *fds = arg; |
f0a4e62b | 11073 | int fd; |
9b402849 | 11074 | |
77bc59b4 UA |
11075 | ev_fd = rcu_dereference_protected(ctx->io_ev_fd, |
11076 | lockdep_is_held(&ctx->uring_lock)); | |
11077 | if (ev_fd) | |
9b402849 JA |
11078 | return -EBUSY; |
11079 | ||
11080 | if (copy_from_user(&fd, fds, sizeof(*fds))) | |
11081 | return -EFAULT; | |
11082 | ||
77bc59b4 UA |
11083 | ev_fd = kmalloc(sizeof(*ev_fd), GFP_KERNEL); |
11084 | if (!ev_fd) | |
11085 | return -ENOMEM; | |
fe7e3257 | 11086 | |
77bc59b4 UA |
11087 | ev_fd->cq_ev_fd = eventfd_ctx_fdget(fd); |
11088 | if (IS_ERR(ev_fd->cq_ev_fd)) { | |
f0a4e62b | 11089 | int ret = PTR_ERR(ev_fd->cq_ev_fd); |
77bc59b4 | 11090 | kfree(ev_fd); |
9b402849 JA |
11091 | return ret; |
11092 | } | |
c75312dd | 11093 | ev_fd->eventfd_async = eventfd_async; |
9aa8dfde | 11094 | ctx->has_evfd = true; |
77bc59b4 | 11095 | rcu_assign_pointer(ctx->io_ev_fd, ev_fd); |
f0a4e62b | 11096 | return 0; |
77bc59b4 UA |
11097 | } |
11098 | ||
11099 | static void io_eventfd_put(struct rcu_head *rcu) | |
11100 | { | |
11101 | struct io_ev_fd *ev_fd = container_of(rcu, struct io_ev_fd, rcu); | |
11102 | ||
11103 | eventfd_ctx_put(ev_fd->cq_ev_fd); | |
11104 | kfree(ev_fd); | |
9b402849 JA |
11105 | } |
11106 | ||
11107 | static int io_eventfd_unregister(struct io_ring_ctx *ctx) | |
11108 | { | |
77bc59b4 UA |
11109 | struct io_ev_fd *ev_fd; |
11110 | ||
11111 | ev_fd = rcu_dereference_protected(ctx->io_ev_fd, | |
11112 | lockdep_is_held(&ctx->uring_lock)); | |
11113 | if (ev_fd) { | |
9aa8dfde | 11114 | ctx->has_evfd = false; |
77bc59b4 UA |
11115 | rcu_assign_pointer(ctx->io_ev_fd, NULL); |
11116 | call_rcu(&ev_fd->rcu, io_eventfd_put); | |
9b402849 JA |
11117 | return 0; |
11118 | } | |
11119 | ||
11120 | return -ENXIO; | |
11121 | } | |
11122 | ||
5a2e745d JA |
11123 | static void io_destroy_buffers(struct io_ring_ctx *ctx) |
11124 | { | |
9cfc7e94 JA |
11125 | struct io_buffer_list *bl; |
11126 | unsigned long index; | |
dbc7d452 JA |
11127 | int i; |
11128 | ||
9cfc7e94 JA |
11129 | for (i = 0; i < BGID_ARRAY; i++) { |
11130 | if (!ctx->io_bl) | |
11131 | break; | |
11132 | __io_remove_buffers(ctx, &ctx->io_bl[i], -1U); | |
11133 | } | |
dbc7d452 | 11134 | |
9cfc7e94 JA |
11135 | xa_for_each(&ctx->io_bl_xa, index, bl) { |
11136 | xa_erase(&ctx->io_bl_xa, bl->bgid); | |
11137 | __io_remove_buffers(ctx, bl, -1U); | |
21870e02 | 11138 | kfree(bl); |
dbc7d452 | 11139 | } |
cc3cec83 JA |
11140 | |
11141 | while (!list_empty(&ctx->io_buffers_pages)) { | |
11142 | struct page *page; | |
11143 | ||
11144 | page = list_first_entry(&ctx->io_buffers_pages, struct page, lru); | |
11145 | list_del_init(&page->lru); | |
11146 | __free_page(page); | |
11147 | } | |
5a2e745d JA |
11148 | } |
11149 | ||
4010fec4 | 11150 | static void io_req_caches_free(struct io_ring_ctx *ctx) |
2b188cc1 | 11151 | { |
cd0ca2e0 | 11152 | struct io_submit_state *state = &ctx->submit_state; |
37f0e767 | 11153 | int nr = 0; |
bf019da7 | 11154 | |
9a4fdbd8 | 11155 | mutex_lock(&ctx->uring_lock); |
cd0ca2e0 | 11156 | io_flush_cached_locked_reqs(ctx, state); |
9a4fdbd8 | 11157 | |
88ab95be | 11158 | while (!io_req_cache_empty(ctx)) { |
c2b6c6bc PB |
11159 | struct io_wq_work_node *node; |
11160 | struct io_kiocb *req; | |
9a4fdbd8 | 11161 | |
c2b6c6bc PB |
11162 | node = wq_stack_extract(&state->free_list); |
11163 | req = container_of(node, struct io_kiocb, comp_list); | |
11164 | kmem_cache_free(req_cachep, req); | |
37f0e767 | 11165 | nr++; |
c2b6c6bc | 11166 | } |
37f0e767 PB |
11167 | if (nr) |
11168 | percpu_ref_put_many(&ctx->refs, nr); | |
9a4fdbd8 JA |
11169 | mutex_unlock(&ctx->uring_lock); |
11170 | } | |
11171 | ||
43597aac | 11172 | static void io_wait_rsrc_data(struct io_rsrc_data *data) |
2b188cc1 | 11173 | { |
43597aac | 11174 | if (data && !atomic_dec_and_test(&data->refs)) |
bd54b6fe | 11175 | wait_for_completion(&data->done); |
bd54b6fe | 11176 | } |
04fc6c80 | 11177 | |
4d9237e3 JA |
11178 | static void io_flush_apoll_cache(struct io_ring_ctx *ctx) |
11179 | { | |
11180 | struct async_poll *apoll; | |
11181 | ||
11182 | while (!list_empty(&ctx->apoll_cache)) { | |
11183 | apoll = list_first_entry(&ctx->apoll_cache, struct async_poll, | |
11184 | poll.wait.entry); | |
11185 | list_del(&apoll->poll.wait.entry); | |
11186 | kfree(apoll); | |
11187 | } | |
11188 | } | |
11189 | ||
c072481d | 11190 | static __cold void io_ring_ctx_free(struct io_ring_ctx *ctx) |
2b188cc1 | 11191 | { |
37d1e2e3 | 11192 | io_sq_thread_finish(ctx); |
2aede0e4 | 11193 | |
37d1e2e3 | 11194 | if (ctx->mm_account) { |
2aede0e4 JA |
11195 | mmdrop(ctx->mm_account); |
11196 | ctx->mm_account = NULL; | |
30975825 | 11197 | } |
def596e9 | 11198 | |
ab409402 | 11199 | io_rsrc_refs_drop(ctx); |
43597aac PB |
11200 | /* __io_rsrc_put_work() may need uring_lock to progress, wait w/o it */ |
11201 | io_wait_rsrc_data(ctx->buf_data); | |
11202 | io_wait_rsrc_data(ctx->file_data); | |
11203 | ||
8bad28d8 | 11204 | mutex_lock(&ctx->uring_lock); |
43597aac | 11205 | if (ctx->buf_data) |
bd54b6fe | 11206 | __io_sqe_buffers_unregister(ctx); |
43597aac | 11207 | if (ctx->file_data) |
08480400 | 11208 | __io_sqe_files_unregister(ctx); |
c4ea060e PB |
11209 | if (ctx->rings) |
11210 | __io_cqring_overflow_flush(ctx, true); | |
9b402849 | 11211 | io_eventfd_unregister(ctx); |
4d9237e3 | 11212 | io_flush_apoll_cache(ctx); |
77bc59b4 | 11213 | mutex_unlock(&ctx->uring_lock); |
5a2e745d | 11214 | io_destroy_buffers(ctx); |
07db298a PB |
11215 | if (ctx->sq_creds) |
11216 | put_cred(ctx->sq_creds); | |
def596e9 | 11217 | |
a7f0ed5a PB |
11218 | /* there are no registered resources left, nobody uses it */ |
11219 | if (ctx->rsrc_node) | |
11220 | io_rsrc_node_destroy(ctx->rsrc_node); | |
8dd03afe | 11221 | if (ctx->rsrc_backup_node) |
b895c9a6 | 11222 | io_rsrc_node_destroy(ctx->rsrc_backup_node); |
a7f0ed5a | 11223 | flush_delayed_work(&ctx->rsrc_put_work); |
756ab7c0 | 11224 | flush_delayed_work(&ctx->fallback_work); |
a7f0ed5a PB |
11225 | |
11226 | WARN_ON_ONCE(!list_empty(&ctx->rsrc_ref_list)); | |
11227 | WARN_ON_ONCE(!llist_empty(&ctx->rsrc_put_llist)); | |
def596e9 | 11228 | |
2b188cc1 | 11229 | #if defined(CONFIG_UNIX) |
355e8d26 EB |
11230 | if (ctx->ring_sock) { |
11231 | ctx->ring_sock->file = NULL; /* so that iput() is called */ | |
2b188cc1 | 11232 | sock_release(ctx->ring_sock); |
355e8d26 | 11233 | } |
2b188cc1 | 11234 | #endif |
ef9dd637 | 11235 | WARN_ON_ONCE(!list_empty(&ctx->ltimeout_list)); |
2b188cc1 | 11236 | |
75b28aff | 11237 | io_mem_free(ctx->rings); |
2b188cc1 | 11238 | io_mem_free(ctx->sq_sqes); |
2b188cc1 JA |
11239 | |
11240 | percpu_ref_exit(&ctx->refs); | |
2b188cc1 | 11241 | free_uid(ctx->user); |
4010fec4 | 11242 | io_req_caches_free(ctx); |
e941894e JA |
11243 | if (ctx->hash_map) |
11244 | io_wq_put_hash(ctx->hash_map); | |
78076bb6 | 11245 | kfree(ctx->cancel_hash); |
6224843d | 11246 | kfree(ctx->dummy_ubuf); |
9cfc7e94 JA |
11247 | kfree(ctx->io_bl); |
11248 | xa_destroy(&ctx->io_bl_xa); | |
2b188cc1 JA |
11249 | kfree(ctx); |
11250 | } | |
11251 | ||
11252 | static __poll_t io_uring_poll(struct file *file, poll_table *wait) | |
11253 | { | |
11254 | struct io_ring_ctx *ctx = file->private_data; | |
11255 | __poll_t mask = 0; | |
11256 | ||
d60aa65b | 11257 | poll_wait(file, &ctx->cq_wait, wait); |
4f7067c3 SB |
11258 | /* |
11259 | * synchronizes with barrier from wq_has_sleeper call in | |
11260 | * io_commit_cqring | |
11261 | */ | |
2b188cc1 | 11262 | smp_rmb(); |
90554200 | 11263 | if (!io_sqring_full(ctx)) |
2b188cc1 | 11264 | mask |= EPOLLOUT | EPOLLWRNORM; |
ed670c3f HX |
11265 | |
11266 | /* | |
11267 | * Don't flush cqring overflow list here, just do a simple check. | |
11268 | * Otherwise there could possible be ABBA deadlock: | |
11269 | * CPU0 CPU1 | |
11270 | * ---- ---- | |
11271 | * lock(&ctx->uring_lock); | |
11272 | * lock(&ep->mtx); | |
11273 | * lock(&ctx->uring_lock); | |
11274 | * lock(&ep->mtx); | |
11275 | * | |
11276 | * Users may get EPOLLIN meanwhile seeing nothing in cqring, this | |
11277 | * pushs them to do the flush. | |
11278 | */ | |
10988a0a DY |
11279 | if (io_cqring_events(ctx) || |
11280 | test_bit(IO_CHECK_CQ_OVERFLOW_BIT, &ctx->check_cq)) | |
2b188cc1 JA |
11281 | mask |= EPOLLIN | EPOLLRDNORM; |
11282 | ||
11283 | return mask; | |
11284 | } | |
11285 | ||
0bead8cd | 11286 | static int io_unregister_personality(struct io_ring_ctx *ctx, unsigned id) |
071698e1 | 11287 | { |
4379bf8b | 11288 | const struct cred *creds; |
071698e1 | 11289 | |
61cf9370 | 11290 | creds = xa_erase(&ctx->personalities, id); |
4379bf8b JA |
11291 | if (creds) { |
11292 | put_cred(creds); | |
0bead8cd | 11293 | return 0; |
1e6fa521 | 11294 | } |
0bead8cd YD |
11295 | |
11296 | return -EINVAL; | |
11297 | } | |
11298 | ||
d56d938b PB |
11299 | struct io_tctx_exit { |
11300 | struct callback_head task_work; | |
11301 | struct completion completion; | |
baf186c4 | 11302 | struct io_ring_ctx *ctx; |
d56d938b PB |
11303 | }; |
11304 | ||
c072481d | 11305 | static __cold void io_tctx_exit_cb(struct callback_head *cb) |
d56d938b PB |
11306 | { |
11307 | struct io_uring_task *tctx = current->io_uring; | |
11308 | struct io_tctx_exit *work; | |
11309 | ||
11310 | work = container_of(cb, struct io_tctx_exit, task_work); | |
11311 | /* | |
11312 | * When @in_idle, we're in cancellation and it's racy to remove the | |
11313 | * node. It'll be removed by the end of cancellation, just ignore it. | |
11314 | */ | |
11315 | if (!atomic_read(&tctx->in_idle)) | |
eef51daa | 11316 | io_uring_del_tctx_node((unsigned long)work->ctx); |
d56d938b PB |
11317 | complete(&work->completion); |
11318 | } | |
11319 | ||
c072481d | 11320 | static __cold bool io_cancel_ctx_cb(struct io_wq_work *work, void *data) |
28090c13 PB |
11321 | { |
11322 | struct io_kiocb *req = container_of(work, struct io_kiocb, work); | |
11323 | ||
11324 | return req->ctx == data; | |
11325 | } | |
11326 | ||
c072481d | 11327 | static __cold void io_ring_exit_work(struct work_struct *work) |
85faa7b8 | 11328 | { |
d56d938b | 11329 | struct io_ring_ctx *ctx = container_of(work, struct io_ring_ctx, exit_work); |
b5bb3a24 | 11330 | unsigned long timeout = jiffies + HZ * 60 * 5; |
58d3be2c | 11331 | unsigned long interval = HZ / 20; |
d56d938b PB |
11332 | struct io_tctx_exit exit; |
11333 | struct io_tctx_node *node; | |
11334 | int ret; | |
85faa7b8 | 11335 | |
56952e91 JA |
11336 | /* |
11337 | * If we're doing polled IO and end up having requests being | |
11338 | * submitted async (out-of-line), then completions can come in while | |
11339 | * we're waiting for refs to drop. We need to reap these manually, | |
11340 | * as nobody else will be looking for them. | |
11341 | */ | |
b2edc0a7 | 11342 | do { |
3dd0c97a | 11343 | io_uring_try_cancel_requests(ctx, NULL, true); |
28090c13 PB |
11344 | if (ctx->sq_data) { |
11345 | struct io_sq_data *sqd = ctx->sq_data; | |
11346 | struct task_struct *tsk; | |
11347 | ||
11348 | io_sq_thread_park(sqd); | |
11349 | tsk = sqd->thread; | |
11350 | if (tsk && tsk->io_uring && tsk->io_uring->io_wq) | |
11351 | io_wq_cancel_cb(tsk->io_uring->io_wq, | |
11352 | io_cancel_ctx_cb, ctx, true); | |
11353 | io_sq_thread_unpark(sqd); | |
11354 | } | |
b5bb3a24 | 11355 | |
37f0e767 PB |
11356 | io_req_caches_free(ctx); |
11357 | ||
58d3be2c PB |
11358 | if (WARN_ON_ONCE(time_after(jiffies, timeout))) { |
11359 | /* there is little hope left, don't run it too often */ | |
11360 | interval = HZ * 60; | |
11361 | } | |
11362 | } while (!wait_for_completion_timeout(&ctx->ref_comp, interval)); | |
d56d938b | 11363 | |
7f00651a PB |
11364 | init_completion(&exit.completion); |
11365 | init_task_work(&exit.task_work, io_tctx_exit_cb); | |
11366 | exit.ctx = ctx; | |
89b5066e PB |
11367 | /* |
11368 | * Some may use context even when all refs and requests have been put, | |
11369 | * and they are free to do so while still holding uring_lock or | |
5b0a6acc | 11370 | * completion_lock, see io_req_task_submit(). Apart from other work, |
89b5066e PB |
11371 | * this lock/unlock section also waits them to finish. |
11372 | */ | |
d56d938b PB |
11373 | mutex_lock(&ctx->uring_lock); |
11374 | while (!list_empty(&ctx->tctx_list)) { | |
b5bb3a24 PB |
11375 | WARN_ON_ONCE(time_after(jiffies, timeout)); |
11376 | ||
d56d938b PB |
11377 | node = list_first_entry(&ctx->tctx_list, struct io_tctx_node, |
11378 | ctx_node); | |
7f00651a PB |
11379 | /* don't spin on a single task if cancellation failed */ |
11380 | list_rotate_left(&ctx->tctx_list); | |
d56d938b PB |
11381 | ret = task_work_add(node->task, &exit.task_work, TWA_SIGNAL); |
11382 | if (WARN_ON_ONCE(ret)) | |
11383 | continue; | |
d56d938b PB |
11384 | |
11385 | mutex_unlock(&ctx->uring_lock); | |
11386 | wait_for_completion(&exit.completion); | |
d56d938b PB |
11387 | mutex_lock(&ctx->uring_lock); |
11388 | } | |
11389 | mutex_unlock(&ctx->uring_lock); | |
79ebeaee JA |
11390 | spin_lock(&ctx->completion_lock); |
11391 | spin_unlock(&ctx->completion_lock); | |
d56d938b | 11392 | |
85faa7b8 JA |
11393 | io_ring_ctx_free(ctx); |
11394 | } | |
11395 | ||
80c4cbdb | 11396 | /* Returns true if we found and killed one or more timeouts */ |
c072481d PB |
11397 | static __cold bool io_kill_timeouts(struct io_ring_ctx *ctx, |
11398 | struct task_struct *tsk, bool cancel_all) | |
80c4cbdb PB |
11399 | { |
11400 | struct io_kiocb *req, *tmp; | |
11401 | int canceled = 0; | |
11402 | ||
79ebeaee JA |
11403 | spin_lock(&ctx->completion_lock); |
11404 | spin_lock_irq(&ctx->timeout_lock); | |
80c4cbdb | 11405 | list_for_each_entry_safe(req, tmp, &ctx->timeout_list, timeout.list) { |
3dd0c97a | 11406 | if (io_match_task(req, tsk, cancel_all)) { |
80c4cbdb PB |
11407 | io_kill_timeout(req, -ECANCELED); |
11408 | canceled++; | |
11409 | } | |
11410 | } | |
79ebeaee | 11411 | spin_unlock_irq(&ctx->timeout_lock); |
60053be8 | 11412 | io_commit_cqring(ctx); |
79ebeaee | 11413 | spin_unlock(&ctx->completion_lock); |
80c4cbdb PB |
11414 | if (canceled != 0) |
11415 | io_cqring_ev_posted(ctx); | |
11416 | return canceled != 0; | |
11417 | } | |
11418 | ||
c072481d | 11419 | static __cold void io_ring_ctx_wait_and_kill(struct io_ring_ctx *ctx) |
2b188cc1 | 11420 | { |
61cf9370 MWO |
11421 | unsigned long index; |
11422 | struct creds *creds; | |
11423 | ||
2b188cc1 JA |
11424 | mutex_lock(&ctx->uring_lock); |
11425 | percpu_ref_kill(&ctx->refs); | |
634578f8 | 11426 | if (ctx->rings) |
6c2450ae | 11427 | __io_cqring_overflow_flush(ctx, true); |
61cf9370 MWO |
11428 | xa_for_each(&ctx->personalities, index, creds) |
11429 | io_unregister_personality(ctx, index); | |
2b188cc1 JA |
11430 | mutex_unlock(&ctx->uring_lock); |
11431 | ||
60053be8 PB |
11432 | /* failed during ring init, it couldn't have issued any requests */ |
11433 | if (ctx->rings) { | |
11434 | io_kill_timeouts(ctx, NULL, true); | |
11435 | io_poll_remove_all(ctx, NULL, true); | |
11436 | /* if we failed setting up the ctx, we might not have any rings */ | |
11437 | io_iopoll_try_reap_events(ctx); | |
11438 | } | |
309fc03a | 11439 | |
85faa7b8 | 11440 | INIT_WORK(&ctx->exit_work, io_ring_exit_work); |
fc666777 JA |
11441 | /* |
11442 | * Use system_unbound_wq to avoid spawning tons of event kworkers | |
11443 | * if we're exiting a ton of rings at the same time. It just adds | |
11444 | * noise and overhead, there's no discernable change in runtime | |
11445 | * over using system_wq. | |
11446 | */ | |
11447 | queue_work(system_unbound_wq, &ctx->exit_work); | |
2b188cc1 JA |
11448 | } |
11449 | ||
11450 | static int io_uring_release(struct inode *inode, struct file *file) | |
11451 | { | |
11452 | struct io_ring_ctx *ctx = file->private_data; | |
11453 | ||
11454 | file->private_data = NULL; | |
11455 | io_ring_ctx_wait_and_kill(ctx); | |
11456 | return 0; | |
11457 | } | |
11458 | ||
f6edbabb PB |
11459 | struct io_task_cancel { |
11460 | struct task_struct *task; | |
3dd0c97a | 11461 | bool all; |
f6edbabb | 11462 | }; |
f254ac04 | 11463 | |
f6edbabb | 11464 | static bool io_cancel_task_cb(struct io_wq_work *work, void *data) |
b711d4ea | 11465 | { |
9a472ef7 | 11466 | struct io_kiocb *req = container_of(work, struct io_kiocb, work); |
f6edbabb | 11467 | struct io_task_cancel *cancel = data; |
9a472ef7 | 11468 | |
6af3f48b | 11469 | return io_match_task_safe(req, cancel->task, cancel->all); |
b711d4ea JA |
11470 | } |
11471 | ||
c072481d PB |
11472 | static __cold bool io_cancel_defer_files(struct io_ring_ctx *ctx, |
11473 | struct task_struct *task, | |
11474 | bool cancel_all) | |
b7ddce3c | 11475 | { |
e1915f76 | 11476 | struct io_defer_entry *de; |
b7ddce3c PB |
11477 | LIST_HEAD(list); |
11478 | ||
79ebeaee | 11479 | spin_lock(&ctx->completion_lock); |
b7ddce3c | 11480 | list_for_each_entry_reverse(de, &ctx->defer_list, list) { |
6af3f48b | 11481 | if (io_match_task_safe(de->req, task, cancel_all)) { |
b7ddce3c PB |
11482 | list_cut_position(&list, &ctx->defer_list, &de->list); |
11483 | break; | |
11484 | } | |
11485 | } | |
79ebeaee | 11486 | spin_unlock(&ctx->completion_lock); |
e1915f76 PB |
11487 | if (list_empty(&list)) |
11488 | return false; | |
b7ddce3c PB |
11489 | |
11490 | while (!list_empty(&list)) { | |
11491 | de = list_first_entry(&list, struct io_defer_entry, list); | |
11492 | list_del_init(&de->list); | |
f41db273 | 11493 | io_req_complete_failed(de->req, -ECANCELED); |
b7ddce3c PB |
11494 | kfree(de); |
11495 | } | |
e1915f76 | 11496 | return true; |
b7ddce3c PB |
11497 | } |
11498 | ||
c072481d | 11499 | static __cold bool io_uring_try_cancel_iowq(struct io_ring_ctx *ctx) |
1b00764f PB |
11500 | { |
11501 | struct io_tctx_node *node; | |
11502 | enum io_wq_cancel cret; | |
11503 | bool ret = false; | |
11504 | ||
11505 | mutex_lock(&ctx->uring_lock); | |
11506 | list_for_each_entry(node, &ctx->tctx_list, ctx_node) { | |
11507 | struct io_uring_task *tctx = node->task->io_uring; | |
11508 | ||
11509 | /* | |
11510 | * io_wq will stay alive while we hold uring_lock, because it's | |
11511 | * killed after ctx nodes, which requires to take the lock. | |
11512 | */ | |
11513 | if (!tctx || !tctx->io_wq) | |
11514 | continue; | |
11515 | cret = io_wq_cancel_cb(tctx->io_wq, io_cancel_ctx_cb, ctx, true); | |
11516 | ret |= (cret != IO_WQ_CANCEL_NOTFOUND); | |
11517 | } | |
11518 | mutex_unlock(&ctx->uring_lock); | |
11519 | ||
11520 | return ret; | |
11521 | } | |
11522 | ||
c072481d PB |
11523 | static __cold void io_uring_try_cancel_requests(struct io_ring_ctx *ctx, |
11524 | struct task_struct *task, | |
11525 | bool cancel_all) | |
9936c7c2 | 11526 | { |
3dd0c97a | 11527 | struct io_task_cancel cancel = { .task = task, .all = cancel_all, }; |
1b00764f | 11528 | struct io_uring_task *tctx = task ? task->io_uring : NULL; |
9936c7c2 | 11529 | |
60053be8 PB |
11530 | /* failed during ring init, it couldn't have issued any requests */ |
11531 | if (!ctx->rings) | |
11532 | return; | |
11533 | ||
9936c7c2 PB |
11534 | while (1) { |
11535 | enum io_wq_cancel cret; | |
11536 | bool ret = false; | |
11537 | ||
1b00764f PB |
11538 | if (!task) { |
11539 | ret |= io_uring_try_cancel_iowq(ctx); | |
11540 | } else if (tctx && tctx->io_wq) { | |
11541 | /* | |
11542 | * Cancels requests of all rings, not only @ctx, but | |
11543 | * it's fine as the task is in exit/exec. | |
11544 | */ | |
5aa75ed5 | 11545 | cret = io_wq_cancel_cb(tctx->io_wq, io_cancel_task_cb, |
9936c7c2 PB |
11546 | &cancel, true); |
11547 | ret |= (cret != IO_WQ_CANCEL_NOTFOUND); | |
11548 | } | |
11549 | ||
11550 | /* SQPOLL thread does its own polling */ | |
3dd0c97a | 11551 | if ((!(ctx->flags & IORING_SETUP_SQPOLL) && cancel_all) || |
d052d1d6 | 11552 | (ctx->sq_data && ctx->sq_data->thread == current)) { |
5eef4e87 | 11553 | while (!wq_list_empty(&ctx->iopoll_list)) { |
9936c7c2 PB |
11554 | io_iopoll_try_reap_events(ctx); |
11555 | ret = true; | |
11556 | } | |
11557 | } | |
11558 | ||
3dd0c97a PB |
11559 | ret |= io_cancel_defer_files(ctx, task, cancel_all); |
11560 | ret |= io_poll_remove_all(ctx, task, cancel_all); | |
11561 | ret |= io_kill_timeouts(ctx, task, cancel_all); | |
e5dc480d PB |
11562 | if (task) |
11563 | ret |= io_run_task_work(); | |
9936c7c2 PB |
11564 | if (!ret) |
11565 | break; | |
11566 | cond_resched(); | |
11567 | } | |
11568 | } | |
11569 | ||
eef51daa | 11570 | static int __io_uring_add_tctx_node(struct io_ring_ctx *ctx) |
0f212204 | 11571 | { |
236434c3 | 11572 | struct io_uring_task *tctx = current->io_uring; |
13bf43f5 | 11573 | struct io_tctx_node *node; |
a528b04e | 11574 | int ret; |
236434c3 MWO |
11575 | |
11576 | if (unlikely(!tctx)) { | |
5aa75ed5 | 11577 | ret = io_uring_alloc_task_context(current, ctx); |
0f212204 JA |
11578 | if (unlikely(ret)) |
11579 | return ret; | |
e139a1ec | 11580 | |
236434c3 | 11581 | tctx = current->io_uring; |
e139a1ec PB |
11582 | if (ctx->iowq_limits_set) { |
11583 | unsigned int limits[2] = { ctx->iowq_limits[0], | |
11584 | ctx->iowq_limits[1], }; | |
11585 | ||
11586 | ret = io_wq_max_workers(tctx->io_wq, limits); | |
11587 | if (ret) | |
11588 | return ret; | |
11589 | } | |
0f212204 | 11590 | } |
cf27f3b1 PB |
11591 | if (!xa_load(&tctx->xa, (unsigned long)ctx)) { |
11592 | node = kmalloc(sizeof(*node), GFP_KERNEL); | |
11593 | if (!node) | |
11594 | return -ENOMEM; | |
11595 | node->ctx = ctx; | |
11596 | node->task = current; | |
13bf43f5 | 11597 | |
cf27f3b1 PB |
11598 | ret = xa_err(xa_store(&tctx->xa, (unsigned long)ctx, |
11599 | node, GFP_KERNEL)); | |
11600 | if (ret) { | |
11601 | kfree(node); | |
11602 | return ret; | |
0f212204 | 11603 | } |
cf27f3b1 PB |
11604 | |
11605 | mutex_lock(&ctx->uring_lock); | |
11606 | list_add(&node->ctx_node, &ctx->tctx_list); | |
11607 | mutex_unlock(&ctx->uring_lock); | |
0f212204 | 11608 | } |
cf27f3b1 | 11609 | tctx->last = ctx; |
0f212204 JA |
11610 | return 0; |
11611 | } | |
11612 | ||
cf27f3b1 PB |
11613 | /* |
11614 | * Note that this task has used io_uring. We use it for cancelation purposes. | |
11615 | */ | |
eef51daa | 11616 | static inline int io_uring_add_tctx_node(struct io_ring_ctx *ctx) |
cf27f3b1 PB |
11617 | { |
11618 | struct io_uring_task *tctx = current->io_uring; | |
11619 | ||
11620 | if (likely(tctx && tctx->last == ctx)) | |
11621 | return 0; | |
eef51daa | 11622 | return __io_uring_add_tctx_node(ctx); |
cf27f3b1 PB |
11623 | } |
11624 | ||
0f212204 JA |
11625 | /* |
11626 | * Remove this io_uring_file -> task mapping. | |
11627 | */ | |
c072481d | 11628 | static __cold void io_uring_del_tctx_node(unsigned long index) |
0f212204 JA |
11629 | { |
11630 | struct io_uring_task *tctx = current->io_uring; | |
13bf43f5 | 11631 | struct io_tctx_node *node; |
2941267b | 11632 | |
eebd2e37 PB |
11633 | if (!tctx) |
11634 | return; | |
13bf43f5 PB |
11635 | node = xa_erase(&tctx->xa, index); |
11636 | if (!node) | |
2941267b | 11637 | return; |
0f212204 | 11638 | |
13bf43f5 PB |
11639 | WARN_ON_ONCE(current != node->task); |
11640 | WARN_ON_ONCE(list_empty(&node->ctx_node)); | |
11641 | ||
11642 | mutex_lock(&node->ctx->uring_lock); | |
11643 | list_del(&node->ctx_node); | |
11644 | mutex_unlock(&node->ctx->uring_lock); | |
11645 | ||
baf186c4 | 11646 | if (tctx->last == node->ctx) |
0f212204 | 11647 | tctx->last = NULL; |
13bf43f5 | 11648 | kfree(node); |
0f212204 JA |
11649 | } |
11650 | ||
c072481d | 11651 | static __cold void io_uring_clean_tctx(struct io_uring_task *tctx) |
de7f1d9e | 11652 | { |
ba5ef6dc | 11653 | struct io_wq *wq = tctx->io_wq; |
13bf43f5 | 11654 | struct io_tctx_node *node; |
de7f1d9e PB |
11655 | unsigned long index; |
11656 | ||
8bab4c09 | 11657 | xa_for_each(&tctx->xa, index, node) { |
eef51daa | 11658 | io_uring_del_tctx_node(index); |
8bab4c09 JA |
11659 | cond_resched(); |
11660 | } | |
b16ef427 ME |
11661 | if (wq) { |
11662 | /* | |
f6f9b278 | 11663 | * Must be after io_uring_del_tctx_node() (removes nodes under |
b16ef427 ME |
11664 | * uring_lock) to avoid race with io_uring_try_cancel_iowq(). |
11665 | */ | |
ba5ef6dc | 11666 | io_wq_put_and_exit(wq); |
dadebc35 | 11667 | tctx->io_wq = NULL; |
b16ef427 | 11668 | } |
de7f1d9e PB |
11669 | } |
11670 | ||
3f48cf18 | 11671 | static s64 tctx_inflight(struct io_uring_task *tctx, bool tracked) |
521d6a73 | 11672 | { |
3f48cf18 | 11673 | if (tracked) |
9cae36a0 | 11674 | return atomic_read(&tctx->inflight_tracked); |
521d6a73 PB |
11675 | return percpu_counter_sum(&tctx->inflight); |
11676 | } | |
11677 | ||
78cc687b PB |
11678 | /* |
11679 | * Find any io_uring ctx that this task has registered or done IO on, and cancel | |
78a78060 | 11680 | * requests. @sqd should be not-null IFF it's an SQPOLL thread cancellation. |
78cc687b | 11681 | */ |
c072481d PB |
11682 | static __cold void io_uring_cancel_generic(bool cancel_all, |
11683 | struct io_sq_data *sqd) | |
0e9ddb39 | 11684 | { |
521d6a73 | 11685 | struct io_uring_task *tctx = current->io_uring; |
734551df | 11686 | struct io_ring_ctx *ctx; |
0e9ddb39 PB |
11687 | s64 inflight; |
11688 | DEFINE_WAIT(wait); | |
fdaf083c | 11689 | |
78cc687b PB |
11690 | WARN_ON_ONCE(sqd && sqd->thread != current); |
11691 | ||
6d042ffb PO |
11692 | if (!current->io_uring) |
11693 | return; | |
17a91051 PB |
11694 | if (tctx->io_wq) |
11695 | io_wq_exit_start(tctx->io_wq); | |
11696 | ||
0e9ddb39 PB |
11697 | atomic_inc(&tctx->in_idle); |
11698 | do { | |
e9dbe221 | 11699 | io_uring_drop_tctx_refs(current); |
0e9ddb39 | 11700 | /* read completions before cancelations */ |
78cc687b | 11701 | inflight = tctx_inflight(tctx, !cancel_all); |
0e9ddb39 PB |
11702 | if (!inflight) |
11703 | break; | |
fdaf083c | 11704 | |
78cc687b PB |
11705 | if (!sqd) { |
11706 | struct io_tctx_node *node; | |
11707 | unsigned long index; | |
0f212204 | 11708 | |
78cc687b PB |
11709 | xa_for_each(&tctx->xa, index, node) { |
11710 | /* sqpoll task will cancel all its requests */ | |
11711 | if (node->ctx->sq_data) | |
11712 | continue; | |
11713 | io_uring_try_cancel_requests(node->ctx, current, | |
11714 | cancel_all); | |
11715 | } | |
11716 | } else { | |
11717 | list_for_each_entry(ctx, &sqd->ctx_list, sqd_list) | |
11718 | io_uring_try_cancel_requests(ctx, current, | |
11719 | cancel_all); | |
11720 | } | |
17a91051 | 11721 | |
78a78060 JA |
11722 | prepare_to_wait(&tctx->wait, &wait, TASK_INTERRUPTIBLE); |
11723 | io_run_task_work(); | |
e9dbe221 | 11724 | io_uring_drop_tctx_refs(current); |
78a78060 | 11725 | |
0f212204 | 11726 | /* |
a1bb3cd5 PB |
11727 | * If we've seen completions, retry without waiting. This |
11728 | * avoids a race where a completion comes in before we did | |
11729 | * prepare_to_wait(). | |
0f212204 | 11730 | */ |
3dd0c97a | 11731 | if (inflight == tctx_inflight(tctx, !cancel_all)) |
a1bb3cd5 | 11732 | schedule(); |
f57555ed | 11733 | finish_wait(&tctx->wait, &wait); |
d8a6df10 | 11734 | } while (1); |
de7f1d9e | 11735 | |
8452d4a6 | 11736 | io_uring_clean_tctx(tctx); |
3dd0c97a | 11737 | if (cancel_all) { |
3cc7fdb9 PB |
11738 | /* |
11739 | * We shouldn't run task_works after cancel, so just leave | |
11740 | * ->in_idle set for normal exit. | |
11741 | */ | |
11742 | atomic_dec(&tctx->in_idle); | |
3f48cf18 PB |
11743 | /* for exec all current's requests should be gone, kill tctx */ |
11744 | __io_uring_free(current); | |
11745 | } | |
44e728b8 PB |
11746 | } |
11747 | ||
f552a27a | 11748 | void __io_uring_cancel(bool cancel_all) |
78cc687b | 11749 | { |
f552a27a | 11750 | io_uring_cancel_generic(cancel_all, NULL); |
78cc687b PB |
11751 | } |
11752 | ||
e7a6c00d JA |
11753 | void io_uring_unreg_ringfd(void) |
11754 | { | |
11755 | struct io_uring_task *tctx = current->io_uring; | |
11756 | int i; | |
11757 | ||
11758 | for (i = 0; i < IO_RINGFD_REG_MAX; i++) { | |
11759 | if (tctx->registered_rings[i]) { | |
11760 | fput(tctx->registered_rings[i]); | |
11761 | tctx->registered_rings[i] = NULL; | |
11762 | } | |
11763 | } | |
11764 | } | |
11765 | ||
11766 | static int io_ring_add_registered_fd(struct io_uring_task *tctx, int fd, | |
11767 | int start, int end) | |
11768 | { | |
11769 | struct file *file; | |
11770 | int offset; | |
11771 | ||
11772 | for (offset = start; offset < end; offset++) { | |
11773 | offset = array_index_nospec(offset, IO_RINGFD_REG_MAX); | |
11774 | if (tctx->registered_rings[offset]) | |
11775 | continue; | |
11776 | ||
11777 | file = fget(fd); | |
11778 | if (!file) { | |
11779 | return -EBADF; | |
11780 | } else if (file->f_op != &io_uring_fops) { | |
11781 | fput(file); | |
11782 | return -EOPNOTSUPP; | |
11783 | } | |
11784 | tctx->registered_rings[offset] = file; | |
11785 | return offset; | |
11786 | } | |
11787 | ||
11788 | return -EBUSY; | |
11789 | } | |
11790 | ||
11791 | /* | |
11792 | * Register a ring fd to avoid fdget/fdput for each io_uring_enter() | |
11793 | * invocation. User passes in an array of struct io_uring_rsrc_update | |
11794 | * with ->data set to the ring_fd, and ->offset given for the desired | |
11795 | * index. If no index is desired, application may set ->offset == -1U | |
11796 | * and we'll find an available index. Returns number of entries | |
11797 | * successfully processed, or < 0 on error if none were processed. | |
11798 | */ | |
11799 | static int io_ringfd_register(struct io_ring_ctx *ctx, void __user *__arg, | |
11800 | unsigned nr_args) | |
11801 | { | |
11802 | struct io_uring_rsrc_update __user *arg = __arg; | |
11803 | struct io_uring_rsrc_update reg; | |
11804 | struct io_uring_task *tctx; | |
11805 | int ret, i; | |
11806 | ||
11807 | if (!nr_args || nr_args > IO_RINGFD_REG_MAX) | |
11808 | return -EINVAL; | |
11809 | ||
11810 | mutex_unlock(&ctx->uring_lock); | |
11811 | ret = io_uring_add_tctx_node(ctx); | |
11812 | mutex_lock(&ctx->uring_lock); | |
11813 | if (ret) | |
11814 | return ret; | |
11815 | ||
11816 | tctx = current->io_uring; | |
11817 | for (i = 0; i < nr_args; i++) { | |
11818 | int start, end; | |
11819 | ||
11820 | if (copy_from_user(®, &arg[i], sizeof(reg))) { | |
11821 | ret = -EFAULT; | |
11822 | break; | |
11823 | } | |
11824 | ||
6fb53cf8 DY |
11825 | if (reg.resv) { |
11826 | ret = -EINVAL; | |
11827 | break; | |
11828 | } | |
11829 | ||
e7a6c00d JA |
11830 | if (reg.offset == -1U) { |
11831 | start = 0; | |
11832 | end = IO_RINGFD_REG_MAX; | |
11833 | } else { | |
11834 | if (reg.offset >= IO_RINGFD_REG_MAX) { | |
11835 | ret = -EINVAL; | |
11836 | break; | |
11837 | } | |
11838 | start = reg.offset; | |
11839 | end = start + 1; | |
11840 | } | |
11841 | ||
11842 | ret = io_ring_add_registered_fd(tctx, reg.data, start, end); | |
11843 | if (ret < 0) | |
11844 | break; | |
11845 | ||
11846 | reg.offset = ret; | |
11847 | if (copy_to_user(&arg[i], ®, sizeof(reg))) { | |
11848 | fput(tctx->registered_rings[reg.offset]); | |
11849 | tctx->registered_rings[reg.offset] = NULL; | |
11850 | ret = -EFAULT; | |
11851 | break; | |
11852 | } | |
11853 | } | |
11854 | ||
11855 | return i ? i : ret; | |
11856 | } | |
11857 | ||
11858 | static int io_ringfd_unregister(struct io_ring_ctx *ctx, void __user *__arg, | |
11859 | unsigned nr_args) | |
11860 | { | |
11861 | struct io_uring_rsrc_update __user *arg = __arg; | |
11862 | struct io_uring_task *tctx = current->io_uring; | |
11863 | struct io_uring_rsrc_update reg; | |
11864 | int ret = 0, i; | |
11865 | ||
11866 | if (!nr_args || nr_args > IO_RINGFD_REG_MAX) | |
11867 | return -EINVAL; | |
11868 | if (!tctx) | |
11869 | return 0; | |
11870 | ||
11871 | for (i = 0; i < nr_args; i++) { | |
11872 | if (copy_from_user(®, &arg[i], sizeof(reg))) { | |
11873 | ret = -EFAULT; | |
11874 | break; | |
11875 | } | |
303cc749 | 11876 | if (reg.resv || reg.data || reg.offset >= IO_RINGFD_REG_MAX) { |
e7a6c00d JA |
11877 | ret = -EINVAL; |
11878 | break; | |
11879 | } | |
11880 | ||
11881 | reg.offset = array_index_nospec(reg.offset, IO_RINGFD_REG_MAX); | |
11882 | if (tctx->registered_rings[reg.offset]) { | |
11883 | fput(tctx->registered_rings[reg.offset]); | |
11884 | tctx->registered_rings[reg.offset] = NULL; | |
11885 | } | |
11886 | } | |
11887 | ||
11888 | return i ? i : ret; | |
11889 | } | |
11890 | ||
6c5c240e RP |
11891 | static void *io_uring_validate_mmap_request(struct file *file, |
11892 | loff_t pgoff, size_t sz) | |
2b188cc1 | 11893 | { |
2b188cc1 | 11894 | struct io_ring_ctx *ctx = file->private_data; |
6c5c240e | 11895 | loff_t offset = pgoff << PAGE_SHIFT; |
2b188cc1 JA |
11896 | struct page *page; |
11897 | void *ptr; | |
11898 | ||
11899 | switch (offset) { | |
11900 | case IORING_OFF_SQ_RING: | |
75b28aff HV |
11901 | case IORING_OFF_CQ_RING: |
11902 | ptr = ctx->rings; | |
2b188cc1 JA |
11903 | break; |
11904 | case IORING_OFF_SQES: | |
11905 | ptr = ctx->sq_sqes; | |
11906 | break; | |
2b188cc1 | 11907 | default: |
6c5c240e | 11908 | return ERR_PTR(-EINVAL); |
2b188cc1 JA |
11909 | } |
11910 | ||
11911 | page = virt_to_head_page(ptr); | |
a50b854e | 11912 | if (sz > page_size(page)) |
6c5c240e RP |
11913 | return ERR_PTR(-EINVAL); |
11914 | ||
11915 | return ptr; | |
11916 | } | |
11917 | ||
11918 | #ifdef CONFIG_MMU | |
11919 | ||
c072481d | 11920 | static __cold int io_uring_mmap(struct file *file, struct vm_area_struct *vma) |
6c5c240e RP |
11921 | { |
11922 | size_t sz = vma->vm_end - vma->vm_start; | |
11923 | unsigned long pfn; | |
11924 | void *ptr; | |
11925 | ||
11926 | ptr = io_uring_validate_mmap_request(file, vma->vm_pgoff, sz); | |
11927 | if (IS_ERR(ptr)) | |
11928 | return PTR_ERR(ptr); | |
2b188cc1 JA |
11929 | |
11930 | pfn = virt_to_phys(ptr) >> PAGE_SHIFT; | |
11931 | return remap_pfn_range(vma, vma->vm_start, pfn, sz, vma->vm_page_prot); | |
11932 | } | |
11933 | ||
6c5c240e RP |
11934 | #else /* !CONFIG_MMU */ |
11935 | ||
11936 | static int io_uring_mmap(struct file *file, struct vm_area_struct *vma) | |
11937 | { | |
11938 | return vma->vm_flags & (VM_SHARED | VM_MAYSHARE) ? 0 : -EINVAL; | |
11939 | } | |
11940 | ||
11941 | static unsigned int io_uring_nommu_mmap_capabilities(struct file *file) | |
11942 | { | |
11943 | return NOMMU_MAP_DIRECT | NOMMU_MAP_READ | NOMMU_MAP_WRITE; | |
11944 | } | |
11945 | ||
11946 | static unsigned long io_uring_nommu_get_unmapped_area(struct file *file, | |
11947 | unsigned long addr, unsigned long len, | |
11948 | unsigned long pgoff, unsigned long flags) | |
11949 | { | |
11950 | void *ptr; | |
11951 | ||
11952 | ptr = io_uring_validate_mmap_request(file, pgoff, len); | |
11953 | if (IS_ERR(ptr)) | |
11954 | return PTR_ERR(ptr); | |
11955 | ||
11956 | return (unsigned long) ptr; | |
11957 | } | |
11958 | ||
11959 | #endif /* !CONFIG_MMU */ | |
11960 | ||
d9d05217 | 11961 | static int io_sqpoll_wait_sq(struct io_ring_ctx *ctx) |
90554200 JA |
11962 | { |
11963 | DEFINE_WAIT(wait); | |
11964 | ||
11965 | do { | |
11966 | if (!io_sqring_full(ctx)) | |
11967 | break; | |
90554200 JA |
11968 | prepare_to_wait(&ctx->sqo_sq_wait, &wait, TASK_INTERRUPTIBLE); |
11969 | ||
11970 | if (!io_sqring_full(ctx)) | |
11971 | break; | |
90554200 JA |
11972 | schedule(); |
11973 | } while (!signal_pending(current)); | |
11974 | ||
11975 | finish_wait(&ctx->sqo_sq_wait, &wait); | |
5199328a | 11976 | return 0; |
90554200 JA |
11977 | } |
11978 | ||
f81440d3 PB |
11979 | static int io_validate_ext_arg(unsigned flags, const void __user *argp, size_t argsz) |
11980 | { | |
11981 | if (flags & IORING_ENTER_EXT_ARG) { | |
11982 | struct io_uring_getevents_arg arg; | |
11983 | ||
11984 | if (argsz != sizeof(arg)) | |
11985 | return -EINVAL; | |
11986 | if (copy_from_user(&arg, argp, sizeof(arg))) | |
11987 | return -EFAULT; | |
11988 | } | |
11989 | return 0; | |
11990 | } | |
11991 | ||
c73ebb68 HX |
11992 | static int io_get_ext_arg(unsigned flags, const void __user *argp, size_t *argsz, |
11993 | struct __kernel_timespec __user **ts, | |
11994 | const sigset_t __user **sig) | |
11995 | { | |
11996 | struct io_uring_getevents_arg arg; | |
11997 | ||
11998 | /* | |
11999 | * If EXT_ARG isn't set, then we have no timespec and the argp pointer | |
12000 | * is just a pointer to the sigset_t. | |
12001 | */ | |
12002 | if (!(flags & IORING_ENTER_EXT_ARG)) { | |
12003 | *sig = (const sigset_t __user *) argp; | |
12004 | *ts = NULL; | |
12005 | return 0; | |
12006 | } | |
12007 | ||
12008 | /* | |
12009 | * EXT_ARG is set - ensure we agree on the size of it and copy in our | |
12010 | * timespec and sigset_t pointers if good. | |
12011 | */ | |
12012 | if (*argsz != sizeof(arg)) | |
12013 | return -EINVAL; | |
12014 | if (copy_from_user(&arg, argp, sizeof(arg))) | |
12015 | return -EFAULT; | |
d2347b96 DY |
12016 | if (arg.pad) |
12017 | return -EINVAL; | |
c73ebb68 HX |
12018 | *sig = u64_to_user_ptr(arg.sigmask); |
12019 | *argsz = arg.sigmask_sz; | |
12020 | *ts = u64_to_user_ptr(arg.ts); | |
12021 | return 0; | |
12022 | } | |
12023 | ||
2b188cc1 | 12024 | SYSCALL_DEFINE6(io_uring_enter, unsigned int, fd, u32, to_submit, |
c73ebb68 HX |
12025 | u32, min_complete, u32, flags, const void __user *, argp, |
12026 | size_t, argsz) | |
2b188cc1 JA |
12027 | { |
12028 | struct io_ring_ctx *ctx; | |
2b188cc1 | 12029 | struct fd f; |
33f993da | 12030 | long ret; |
2b188cc1 | 12031 | |
4c6e277c | 12032 | io_run_task_work(); |
b41e9852 | 12033 | |
33f993da | 12034 | if (unlikely(flags & ~(IORING_ENTER_GETEVENTS | IORING_ENTER_SQ_WAKEUP | |
e7a6c00d JA |
12035 | IORING_ENTER_SQ_WAIT | IORING_ENTER_EXT_ARG | |
12036 | IORING_ENTER_REGISTERED_RING))) | |
2b188cc1 JA |
12037 | return -EINVAL; |
12038 | ||
e7a6c00d JA |
12039 | /* |
12040 | * Ring fd has been registered via IORING_REGISTER_RING_FDS, we | |
12041 | * need only dereference our task private array to find it. | |
12042 | */ | |
12043 | if (flags & IORING_ENTER_REGISTERED_RING) { | |
12044 | struct io_uring_task *tctx = current->io_uring; | |
12045 | ||
12046 | if (!tctx || fd >= IO_RINGFD_REG_MAX) | |
12047 | return -EINVAL; | |
12048 | fd = array_index_nospec(fd, IO_RINGFD_REG_MAX); | |
12049 | f.file = tctx->registered_rings[fd]; | |
4329490a | 12050 | f.flags = 0; |
e7a6c00d JA |
12051 | } else { |
12052 | f = fdget(fd); | |
e7a6c00d | 12053 | } |
2b188cc1 | 12054 | |
4329490a AV |
12055 | if (unlikely(!f.file)) |
12056 | return -EBADF; | |
12057 | ||
2b188cc1 | 12058 | ret = -EOPNOTSUPP; |
33f993da | 12059 | if (unlikely(f.file->f_op != &io_uring_fops)) |
2b188cc1 JA |
12060 | goto out_fput; |
12061 | ||
12062 | ret = -ENXIO; | |
12063 | ctx = f.file->private_data; | |
33f993da | 12064 | if (unlikely(!percpu_ref_tryget(&ctx->refs))) |
2b188cc1 JA |
12065 | goto out_fput; |
12066 | ||
7e84e1c7 | 12067 | ret = -EBADFD; |
33f993da | 12068 | if (unlikely(ctx->flags & IORING_SETUP_R_DISABLED)) |
7e84e1c7 SG |
12069 | goto out; |
12070 | ||
6c271ce2 JA |
12071 | /* |
12072 | * For SQ polling, the thread will do all submissions and completions. | |
12073 | * Just return the requested submit count, and wake the thread if | |
12074 | * we were asked to. | |
12075 | */ | |
b2a9eada | 12076 | ret = 0; |
6c271ce2 | 12077 | if (ctx->flags & IORING_SETUP_SQPOLL) { |
90f67366 | 12078 | io_cqring_overflow_flush(ctx); |
89448c47 | 12079 | |
21f96522 JA |
12080 | if (unlikely(ctx->sq_data->thread == NULL)) { |
12081 | ret = -EOWNERDEAD; | |
04147488 | 12082 | goto out; |
21f96522 | 12083 | } |
6c271ce2 | 12084 | if (flags & IORING_ENTER_SQ_WAKEUP) |
534ca6d6 | 12085 | wake_up(&ctx->sq_data->wait); |
d9d05217 PB |
12086 | if (flags & IORING_ENTER_SQ_WAIT) { |
12087 | ret = io_sqpoll_wait_sq(ctx); | |
12088 | if (ret) | |
12089 | goto out; | |
12090 | } | |
3e813c90 | 12091 | ret = to_submit; |
b2a9eada | 12092 | } else if (to_submit) { |
eef51daa | 12093 | ret = io_uring_add_tctx_node(ctx); |
0f212204 JA |
12094 | if (unlikely(ret)) |
12095 | goto out; | |
7c504e65 | 12096 | |
2b188cc1 | 12097 | mutex_lock(&ctx->uring_lock); |
3e813c90 DY |
12098 | ret = io_submit_sqes(ctx, to_submit); |
12099 | if (ret != to_submit) { | |
d487b43c | 12100 | mutex_unlock(&ctx->uring_lock); |
7c504e65 | 12101 | goto out; |
d487b43c PB |
12102 | } |
12103 | if ((flags & IORING_ENTER_GETEVENTS) && ctx->syscall_iopoll) | |
12104 | goto iopoll_locked; | |
12105 | mutex_unlock(&ctx->uring_lock); | |
2b188cc1 JA |
12106 | } |
12107 | if (flags & IORING_ENTER_GETEVENTS) { | |
3e813c90 | 12108 | int ret2; |
773697b6 | 12109 | if (ctx->syscall_iopoll) { |
d487b43c PB |
12110 | /* |
12111 | * We disallow the app entering submit/complete with | |
12112 | * polling, but we still need to lock the ring to | |
12113 | * prevent racing with polled issue that got punted to | |
12114 | * a workqueue. | |
12115 | */ | |
12116 | mutex_lock(&ctx->uring_lock); | |
12117 | iopoll_locked: | |
3e813c90 DY |
12118 | ret2 = io_validate_ext_arg(flags, argp, argsz); |
12119 | if (likely(!ret2)) { | |
12120 | min_complete = min(min_complete, | |
12121 | ctx->cq_entries); | |
12122 | ret2 = io_iopoll_check(ctx, min_complete); | |
d487b43c PB |
12123 | } |
12124 | mutex_unlock(&ctx->uring_lock); | |
def596e9 | 12125 | } else { |
f81440d3 PB |
12126 | const sigset_t __user *sig; |
12127 | struct __kernel_timespec __user *ts; | |
12128 | ||
3e813c90 DY |
12129 | ret2 = io_get_ext_arg(flags, argp, &argsz, &ts, &sig); |
12130 | if (likely(!ret2)) { | |
12131 | min_complete = min(min_complete, | |
12132 | ctx->cq_entries); | |
12133 | ret2 = io_cqring_wait(ctx, min_complete, sig, | |
12134 | argsz, ts); | |
12135 | } | |
def596e9 | 12136 | } |
c73ebb68 | 12137 | |
155bc950 | 12138 | if (!ret) { |
3e813c90 | 12139 | ret = ret2; |
2b188cc1 | 12140 | |
155bc950 DY |
12141 | /* |
12142 | * EBADR indicates that one or more CQE were dropped. | |
12143 | * Once the user has been informed we can clear the bit | |
12144 | * as they are obviously ok with those drops. | |
12145 | */ | |
12146 | if (unlikely(ret2 == -EBADR)) | |
12147 | clear_bit(IO_CHECK_CQ_DROPPED_BIT, | |
12148 | &ctx->check_cq); | |
def596e9 | 12149 | } |
2b188cc1 JA |
12150 | } |
12151 | ||
7c504e65 | 12152 | out: |
6805b32e | 12153 | percpu_ref_put(&ctx->refs); |
2b188cc1 | 12154 | out_fput: |
4329490a | 12155 | fdput(f); |
3e813c90 | 12156 | return ret; |
2b188cc1 JA |
12157 | } |
12158 | ||
bebdb65e | 12159 | #ifdef CONFIG_PROC_FS |
c072481d | 12160 | static __cold int io_uring_show_cred(struct seq_file *m, unsigned int id, |
61cf9370 | 12161 | const struct cred *cred) |
87ce955b | 12162 | { |
87ce955b JA |
12163 | struct user_namespace *uns = seq_user_ns(m); |
12164 | struct group_info *gi; | |
12165 | kernel_cap_t cap; | |
12166 | unsigned __capi; | |
12167 | int g; | |
12168 | ||
12169 | seq_printf(m, "%5d\n", id); | |
12170 | seq_put_decimal_ull(m, "\tUid:\t", from_kuid_munged(uns, cred->uid)); | |
12171 | seq_put_decimal_ull(m, "\t\t", from_kuid_munged(uns, cred->euid)); | |
12172 | seq_put_decimal_ull(m, "\t\t", from_kuid_munged(uns, cred->suid)); | |
12173 | seq_put_decimal_ull(m, "\t\t", from_kuid_munged(uns, cred->fsuid)); | |
12174 | seq_put_decimal_ull(m, "\n\tGid:\t", from_kgid_munged(uns, cred->gid)); | |
12175 | seq_put_decimal_ull(m, "\t\t", from_kgid_munged(uns, cred->egid)); | |
12176 | seq_put_decimal_ull(m, "\t\t", from_kgid_munged(uns, cred->sgid)); | |
12177 | seq_put_decimal_ull(m, "\t\t", from_kgid_munged(uns, cred->fsgid)); | |
12178 | seq_puts(m, "\n\tGroups:\t"); | |
12179 | gi = cred->group_info; | |
12180 | for (g = 0; g < gi->ngroups; g++) { | |
12181 | seq_put_decimal_ull(m, g ? " " : "", | |
12182 | from_kgid_munged(uns, gi->gid[g])); | |
12183 | } | |
12184 | seq_puts(m, "\n\tCapEff:\t"); | |
12185 | cap = cred->cap_effective; | |
12186 | CAP_FOR_EACH_U32(__capi) | |
12187 | seq_put_hex_ll(m, NULL, cap.cap[CAP_LAST_U32 - __capi], 8); | |
12188 | seq_putc(m, '\n'); | |
12189 | return 0; | |
12190 | } | |
12191 | ||
c072481d PB |
12192 | static __cold void __io_uring_show_fdinfo(struct io_ring_ctx *ctx, |
12193 | struct seq_file *m) | |
87ce955b | 12194 | { |
dbbe9c64 | 12195 | struct io_sq_data *sq = NULL; |
83f84356 HX |
12196 | struct io_overflow_cqe *ocqe; |
12197 | struct io_rings *r = ctx->rings; | |
12198 | unsigned int sq_mask = ctx->sq_entries - 1, cq_mask = ctx->cq_entries - 1; | |
83f84356 HX |
12199 | unsigned int sq_head = READ_ONCE(r->sq.head); |
12200 | unsigned int sq_tail = READ_ONCE(r->sq.tail); | |
12201 | unsigned int cq_head = READ_ONCE(r->cq.head); | |
12202 | unsigned int cq_tail = READ_ONCE(r->cq.tail); | |
f9b3dfcc | 12203 | unsigned int cq_shift = 0; |
f75d1183 | 12204 | unsigned int sq_entries, cq_entries; |
fad8e0de | 12205 | bool has_lock; |
f9b3dfcc | 12206 | bool is_cqe32 = (ctx->flags & IORING_SETUP_CQE32); |
83f84356 HX |
12207 | unsigned int i; |
12208 | ||
f9b3dfcc SR |
12209 | if (is_cqe32) |
12210 | cq_shift = 1; | |
12211 | ||
83f84356 HX |
12212 | /* |
12213 | * we may get imprecise sqe and cqe info if uring is actively running | |
12214 | * since we get cached_sq_head and cached_cq_tail without uring_lock | |
12215 | * and sq_tail and cq_head are changed by userspace. But it's ok since | |
12216 | * we usually use these info when it is stuck. | |
12217 | */ | |
c0235652 | 12218 | seq_printf(m, "SqMask:\t0x%x\n", sq_mask); |
f75d1183 JA |
12219 | seq_printf(m, "SqHead:\t%u\n", sq_head); |
12220 | seq_printf(m, "SqTail:\t%u\n", sq_tail); | |
12221 | seq_printf(m, "CachedSqHead:\t%u\n", ctx->cached_sq_head); | |
12222 | seq_printf(m, "CqMask:\t0x%x\n", cq_mask); | |
12223 | seq_printf(m, "CqHead:\t%u\n", cq_head); | |
12224 | seq_printf(m, "CqTail:\t%u\n", cq_tail); | |
12225 | seq_printf(m, "CachedCqTail:\t%u\n", ctx->cached_cq_tail); | |
12226 | seq_printf(m, "SQEs:\t%u\n", sq_tail - ctx->cached_sq_head); | |
12227 | sq_entries = min(sq_tail - sq_head, ctx->sq_entries); | |
12228 | for (i = 0; i < sq_entries; i++) { | |
12229 | unsigned int entry = i + sq_head; | |
12230 | unsigned int sq_idx = READ_ONCE(ctx->sq_array[entry & sq_mask]); | |
a1957780 | 12231 | struct io_uring_sqe *sqe; |
f75d1183 JA |
12232 | |
12233 | if (sq_idx > sq_mask) | |
12234 | continue; | |
12235 | sqe = &ctx->sq_sqes[sq_idx]; | |
12236 | seq_printf(m, "%5u: opcode:%d, fd:%d, flags:%x, user_data:%llu\n", | |
12237 | sq_idx, sqe->opcode, sqe->fd, sqe->flags, | |
12238 | sqe->user_data); | |
83f84356 | 12239 | } |
f75d1183 JA |
12240 | seq_printf(m, "CQEs:\t%u\n", cq_tail - cq_head); |
12241 | cq_entries = min(cq_tail - cq_head, ctx->cq_entries); | |
12242 | for (i = 0; i < cq_entries; i++) { | |
12243 | unsigned int entry = i + cq_head; | |
f9b3dfcc | 12244 | struct io_uring_cqe *cqe = &r->cqes[(entry & cq_mask) << cq_shift]; |
83f84356 | 12245 | |
f9b3dfcc SR |
12246 | if (!is_cqe32) { |
12247 | seq_printf(m, "%5u: user_data:%llu, res:%d, flag:%x\n", | |
f75d1183 JA |
12248 | entry & cq_mask, cqe->user_data, cqe->res, |
12249 | cqe->flags); | |
f9b3dfcc SR |
12250 | } else { |
12251 | seq_printf(m, "%5u: user_data:%llu, res:%d, flag:%x, " | |
12252 | "extra1:%llu, extra2:%llu\n", | |
12253 | entry & cq_mask, cqe->user_data, cqe->res, | |
12254 | cqe->flags, cqe->big_cqe[0], cqe->big_cqe[1]); | |
12255 | } | |
83f84356 | 12256 | } |
87ce955b | 12257 | |
fad8e0de JA |
12258 | /* |
12259 | * Avoid ABBA deadlock between the seq lock and the io_uring mutex, | |
12260 | * since fdinfo case grabs it in the opposite direction of normal use | |
12261 | * cases. If we fail to get the lock, we just don't iterate any | |
12262 | * structures that could be going away outside the io_uring mutex. | |
12263 | */ | |
12264 | has_lock = mutex_trylock(&ctx->uring_lock); | |
12265 | ||
5f3f26f9 | 12266 | if (has_lock && (ctx->flags & IORING_SETUP_SQPOLL)) { |
dbbe9c64 | 12267 | sq = ctx->sq_data; |
5f3f26f9 JA |
12268 | if (!sq->thread) |
12269 | sq = NULL; | |
12270 | } | |
dbbe9c64 JQ |
12271 | |
12272 | seq_printf(m, "SqThread:\t%d\n", sq ? task_pid_nr(sq->thread) : -1); | |
12273 | seq_printf(m, "SqThreadCpu:\t%d\n", sq ? task_cpu(sq->thread) : -1); | |
87ce955b | 12274 | seq_printf(m, "UserFiles:\t%u\n", ctx->nr_user_files); |
fad8e0de | 12275 | for (i = 0; has_lock && i < ctx->nr_user_files; i++) { |
7b29f92d | 12276 | struct file *f = io_file_from_index(ctx, i); |
87ce955b | 12277 | |
87ce955b JA |
12278 | if (f) |
12279 | seq_printf(m, "%5u: %s\n", i, file_dentry(f)->d_iname); | |
12280 | else | |
12281 | seq_printf(m, "%5u: <none>\n", i); | |
12282 | } | |
12283 | seq_printf(m, "UserBufs:\t%u\n", ctx->nr_user_bufs); | |
fad8e0de | 12284 | for (i = 0; has_lock && i < ctx->nr_user_bufs; i++) { |
41edf1a5 | 12285 | struct io_mapped_ubuf *buf = ctx->user_bufs[i]; |
4751f53d | 12286 | unsigned int len = buf->ubuf_end - buf->ubuf; |
87ce955b | 12287 | |
4751f53d | 12288 | seq_printf(m, "%5u: 0x%llx/%u\n", i, buf->ubuf, len); |
87ce955b | 12289 | } |
61cf9370 MWO |
12290 | if (has_lock && !xa_empty(&ctx->personalities)) { |
12291 | unsigned long index; | |
12292 | const struct cred *cred; | |
12293 | ||
87ce955b | 12294 | seq_printf(m, "Personalities:\n"); |
61cf9370 MWO |
12295 | xa_for_each(&ctx->personalities, index, cred) |
12296 | io_uring_show_cred(m, index, cred); | |
87ce955b | 12297 | } |
83f84356 HX |
12298 | if (has_lock) |
12299 | mutex_unlock(&ctx->uring_lock); | |
12300 | ||
12301 | seq_puts(m, "PollList:\n"); | |
79ebeaee | 12302 | spin_lock(&ctx->completion_lock); |
d7718a9d JA |
12303 | for (i = 0; i < (1U << ctx->cancel_hash_bits); i++) { |
12304 | struct hlist_head *list = &ctx->cancel_hash[i]; | |
12305 | struct io_kiocb *req; | |
12306 | ||
12307 | hlist_for_each_entry(req, list, hash_node) | |
12308 | seq_printf(m, " op=%d, task_works=%d\n", req->opcode, | |
7f62d40d | 12309 | task_work_pending(req->task)); |
d7718a9d | 12310 | } |
83f84356 HX |
12311 | |
12312 | seq_puts(m, "CqOverflowList:\n"); | |
12313 | list_for_each_entry(ocqe, &ctx->cq_overflow_list, list) { | |
12314 | struct io_uring_cqe *cqe = &ocqe->cqe; | |
12315 | ||
12316 | seq_printf(m, " user_data=%llu, res=%d, flags=%x\n", | |
12317 | cqe->user_data, cqe->res, cqe->flags); | |
12318 | ||
12319 | } | |
12320 | ||
79ebeaee | 12321 | spin_unlock(&ctx->completion_lock); |
87ce955b JA |
12322 | } |
12323 | ||
c072481d | 12324 | static __cold void io_uring_show_fdinfo(struct seq_file *m, struct file *f) |
87ce955b JA |
12325 | { |
12326 | struct io_ring_ctx *ctx = f->private_data; | |
12327 | ||
12328 | if (percpu_ref_tryget(&ctx->refs)) { | |
12329 | __io_uring_show_fdinfo(ctx, m); | |
12330 | percpu_ref_put(&ctx->refs); | |
12331 | } | |
12332 | } | |
bebdb65e | 12333 | #endif |
87ce955b | 12334 | |
2b188cc1 JA |
12335 | static const struct file_operations io_uring_fops = { |
12336 | .release = io_uring_release, | |
12337 | .mmap = io_uring_mmap, | |
6c5c240e RP |
12338 | #ifndef CONFIG_MMU |
12339 | .get_unmapped_area = io_uring_nommu_get_unmapped_area, | |
12340 | .mmap_capabilities = io_uring_nommu_mmap_capabilities, | |
12341 | #endif | |
2b188cc1 | 12342 | .poll = io_uring_poll, |
bebdb65e | 12343 | #ifdef CONFIG_PROC_FS |
87ce955b | 12344 | .show_fdinfo = io_uring_show_fdinfo, |
bebdb65e | 12345 | #endif |
2b188cc1 JA |
12346 | }; |
12347 | ||
c072481d PB |
12348 | static __cold int io_allocate_scq_urings(struct io_ring_ctx *ctx, |
12349 | struct io_uring_params *p) | |
2b188cc1 | 12350 | { |
75b28aff HV |
12351 | struct io_rings *rings; |
12352 | size_t size, sq_array_offset; | |
2b188cc1 | 12353 | |
bd740481 JA |
12354 | /* make sure these are sane, as we already accounted them */ |
12355 | ctx->sq_entries = p->sq_entries; | |
12356 | ctx->cq_entries = p->cq_entries; | |
12357 | ||
baf9cb64 | 12358 | size = rings_size(ctx, p->sq_entries, p->cq_entries, &sq_array_offset); |
75b28aff HV |
12359 | if (size == SIZE_MAX) |
12360 | return -EOVERFLOW; | |
12361 | ||
12362 | rings = io_mem_alloc(size); | |
12363 | if (!rings) | |
2b188cc1 JA |
12364 | return -ENOMEM; |
12365 | ||
75b28aff HV |
12366 | ctx->rings = rings; |
12367 | ctx->sq_array = (u32 *)((char *)rings + sq_array_offset); | |
12368 | rings->sq_ring_mask = p->sq_entries - 1; | |
12369 | rings->cq_ring_mask = p->cq_entries - 1; | |
12370 | rings->sq_ring_entries = p->sq_entries; | |
12371 | rings->cq_ring_entries = p->cq_entries; | |
2b188cc1 | 12372 | |
ebdeb7c0 JA |
12373 | if (p->flags & IORING_SETUP_SQE128) |
12374 | size = array_size(2 * sizeof(struct io_uring_sqe), p->sq_entries); | |
12375 | else | |
12376 | size = array_size(sizeof(struct io_uring_sqe), p->sq_entries); | |
eb065d30 JA |
12377 | if (size == SIZE_MAX) { |
12378 | io_mem_free(ctx->rings); | |
12379 | ctx->rings = NULL; | |
2b188cc1 | 12380 | return -EOVERFLOW; |
eb065d30 | 12381 | } |
2b188cc1 JA |
12382 | |
12383 | ctx->sq_sqes = io_mem_alloc(size); | |
eb065d30 JA |
12384 | if (!ctx->sq_sqes) { |
12385 | io_mem_free(ctx->rings); | |
12386 | ctx->rings = NULL; | |
2b188cc1 | 12387 | return -ENOMEM; |
eb065d30 | 12388 | } |
2b188cc1 | 12389 | |
2b188cc1 JA |
12390 | return 0; |
12391 | } | |
12392 | ||
9faadcc8 PB |
12393 | static int io_uring_install_fd(struct io_ring_ctx *ctx, struct file *file) |
12394 | { | |
12395 | int ret, fd; | |
12396 | ||
12397 | fd = get_unused_fd_flags(O_RDWR | O_CLOEXEC); | |
12398 | if (fd < 0) | |
12399 | return fd; | |
12400 | ||
eef51daa | 12401 | ret = io_uring_add_tctx_node(ctx); |
9faadcc8 PB |
12402 | if (ret) { |
12403 | put_unused_fd(fd); | |
12404 | return ret; | |
12405 | } | |
12406 | fd_install(fd, file); | |
12407 | return fd; | |
12408 | } | |
12409 | ||
2b188cc1 JA |
12410 | /* |
12411 | * Allocate an anonymous fd, this is what constitutes the application | |
12412 | * visible backing of an io_uring instance. The application mmaps this | |
12413 | * fd to gain access to the SQ/CQ ring details. If UNIX sockets are enabled, | |
12414 | * we have to tie this fd to a socket for file garbage collection purposes. | |
12415 | */ | |
9faadcc8 | 12416 | static struct file *io_uring_get_file(struct io_ring_ctx *ctx) |
2b188cc1 JA |
12417 | { |
12418 | struct file *file; | |
9faadcc8 | 12419 | #if defined(CONFIG_UNIX) |
2b188cc1 JA |
12420 | int ret; |
12421 | ||
2b188cc1 JA |
12422 | ret = sock_create_kern(&init_net, PF_UNIX, SOCK_RAW, IPPROTO_IP, |
12423 | &ctx->ring_sock); | |
12424 | if (ret) | |
9faadcc8 | 12425 | return ERR_PTR(ret); |
2b188cc1 JA |
12426 | #endif |
12427 | ||
91a9ab7c PM |
12428 | file = anon_inode_getfile_secure("[io_uring]", &io_uring_fops, ctx, |
12429 | O_RDWR | O_CLOEXEC, NULL); | |
2b188cc1 | 12430 | #if defined(CONFIG_UNIX) |
9faadcc8 PB |
12431 | if (IS_ERR(file)) { |
12432 | sock_release(ctx->ring_sock); | |
12433 | ctx->ring_sock = NULL; | |
12434 | } else { | |
12435 | ctx->ring_sock->file = file; | |
0f212204 | 12436 | } |
2b188cc1 | 12437 | #endif |
9faadcc8 | 12438 | return file; |
2b188cc1 JA |
12439 | } |
12440 | ||
c072481d PB |
12441 | static __cold int io_uring_create(unsigned entries, struct io_uring_params *p, |
12442 | struct io_uring_params __user *params) | |
2b188cc1 | 12443 | { |
2b188cc1 | 12444 | struct io_ring_ctx *ctx; |
9faadcc8 | 12445 | struct file *file; |
2b188cc1 JA |
12446 | int ret; |
12447 | ||
8110c1a6 | 12448 | if (!entries) |
2b188cc1 | 12449 | return -EINVAL; |
8110c1a6 JA |
12450 | if (entries > IORING_MAX_ENTRIES) { |
12451 | if (!(p->flags & IORING_SETUP_CLAMP)) | |
12452 | return -EINVAL; | |
12453 | entries = IORING_MAX_ENTRIES; | |
12454 | } | |
2b188cc1 JA |
12455 | |
12456 | /* | |
12457 | * Use twice as many entries for the CQ ring. It's possible for the | |
12458 | * application to drive a higher depth than the size of the SQ ring, | |
12459 | * since the sqes are only used at submission time. This allows for | |
33a107f0 JA |
12460 | * some flexibility in overcommitting a bit. If the application has |
12461 | * set IORING_SETUP_CQSIZE, it will have passed in the desired number | |
12462 | * of CQ ring entries manually. | |
2b188cc1 JA |
12463 | */ |
12464 | p->sq_entries = roundup_pow_of_two(entries); | |
33a107f0 JA |
12465 | if (p->flags & IORING_SETUP_CQSIZE) { |
12466 | /* | |
12467 | * If IORING_SETUP_CQSIZE is set, we do the same roundup | |
12468 | * to a power-of-two, if it isn't already. We do NOT impose | |
12469 | * any cq vs sq ring sizing. | |
12470 | */ | |
eb2667b3 | 12471 | if (!p->cq_entries) |
33a107f0 | 12472 | return -EINVAL; |
8110c1a6 JA |
12473 | if (p->cq_entries > IORING_MAX_CQ_ENTRIES) { |
12474 | if (!(p->flags & IORING_SETUP_CLAMP)) | |
12475 | return -EINVAL; | |
12476 | p->cq_entries = IORING_MAX_CQ_ENTRIES; | |
12477 | } | |
eb2667b3 JQ |
12478 | p->cq_entries = roundup_pow_of_two(p->cq_entries); |
12479 | if (p->cq_entries < p->sq_entries) | |
12480 | return -EINVAL; | |
33a107f0 JA |
12481 | } else { |
12482 | p->cq_entries = 2 * p->sq_entries; | |
12483 | } | |
2b188cc1 | 12484 | |
2b188cc1 | 12485 | ctx = io_ring_ctx_alloc(p); |
62e398be | 12486 | if (!ctx) |
2b188cc1 | 12487 | return -ENOMEM; |
773697b6 PB |
12488 | |
12489 | /* | |
12490 | * When SETUP_IOPOLL and SETUP_SQPOLL are both enabled, user | |
12491 | * space applications don't need to do io completion events | |
12492 | * polling again, they can rely on io_sq_thread to do polling | |
12493 | * work, which can reduce cpu usage and uring_lock contention. | |
12494 | */ | |
12495 | if (ctx->flags & IORING_SETUP_IOPOLL && | |
12496 | !(ctx->flags & IORING_SETUP_SQPOLL)) | |
12497 | ctx->syscall_iopoll = 1; | |
12498 | ||
2b188cc1 | 12499 | ctx->compat = in_compat_syscall(); |
62e398be JA |
12500 | if (!capable(CAP_IPC_LOCK)) |
12501 | ctx->user = get_uid(current_user()); | |
2aede0e4 | 12502 | |
9f010507 | 12503 | /* |
e1169f06 JA |
12504 | * For SQPOLL, we just need a wakeup, always. For !SQPOLL, if |
12505 | * COOP_TASKRUN is set, then IPIs are never needed by the app. | |
9f010507 | 12506 | */ |
e1169f06 JA |
12507 | ret = -EINVAL; |
12508 | if (ctx->flags & IORING_SETUP_SQPOLL) { | |
12509 | /* IPI related flags don't make sense with SQPOLL */ | |
ef060ea9 JA |
12510 | if (ctx->flags & (IORING_SETUP_COOP_TASKRUN | |
12511 | IORING_SETUP_TASKRUN_FLAG)) | |
e1169f06 | 12512 | goto err; |
9f010507 | 12513 | ctx->notify_method = TWA_SIGNAL_NO_IPI; |
e1169f06 JA |
12514 | } else if (ctx->flags & IORING_SETUP_COOP_TASKRUN) { |
12515 | ctx->notify_method = TWA_SIGNAL_NO_IPI; | |
12516 | } else { | |
ef060ea9 JA |
12517 | if (ctx->flags & IORING_SETUP_TASKRUN_FLAG) |
12518 | goto err; | |
9f010507 | 12519 | ctx->notify_method = TWA_SIGNAL; |
e1169f06 | 12520 | } |
9f010507 | 12521 | |
2aede0e4 JA |
12522 | /* |
12523 | * This is just grabbed for accounting purposes. When a process exits, | |
12524 | * the mm is exited and dropped before the files, hence we need to hang | |
12525 | * on to this mm purely for the purposes of being able to unaccount | |
12526 | * memory (locked/pinned vm). It's not used for anything else. | |
12527 | */ | |
6b7898eb | 12528 | mmgrab(current->mm); |
2aede0e4 | 12529 | ctx->mm_account = current->mm; |
6b7898eb | 12530 | |
2b188cc1 JA |
12531 | ret = io_allocate_scq_urings(ctx, p); |
12532 | if (ret) | |
12533 | goto err; | |
12534 | ||
7e84e1c7 | 12535 | ret = io_sq_offload_create(ctx, p); |
2b188cc1 JA |
12536 | if (ret) |
12537 | goto err; | |
eae071c9 | 12538 | /* always set a rsrc node */ |
47b228ce PB |
12539 | ret = io_rsrc_node_switch_start(ctx); |
12540 | if (ret) | |
12541 | goto err; | |
eae071c9 | 12542 | io_rsrc_node_switch(ctx, NULL); |
2b188cc1 | 12543 | |
2b188cc1 | 12544 | memset(&p->sq_off, 0, sizeof(p->sq_off)); |
75b28aff HV |
12545 | p->sq_off.head = offsetof(struct io_rings, sq.head); |
12546 | p->sq_off.tail = offsetof(struct io_rings, sq.tail); | |
12547 | p->sq_off.ring_mask = offsetof(struct io_rings, sq_ring_mask); | |
12548 | p->sq_off.ring_entries = offsetof(struct io_rings, sq_ring_entries); | |
12549 | p->sq_off.flags = offsetof(struct io_rings, sq_flags); | |
12550 | p->sq_off.dropped = offsetof(struct io_rings, sq_dropped); | |
12551 | p->sq_off.array = (char *)ctx->sq_array - (char *)ctx->rings; | |
2b188cc1 JA |
12552 | |
12553 | memset(&p->cq_off, 0, sizeof(p->cq_off)); | |
75b28aff HV |
12554 | p->cq_off.head = offsetof(struct io_rings, cq.head); |
12555 | p->cq_off.tail = offsetof(struct io_rings, cq.tail); | |
12556 | p->cq_off.ring_mask = offsetof(struct io_rings, cq_ring_mask); | |
12557 | p->cq_off.ring_entries = offsetof(struct io_rings, cq_ring_entries); | |
12558 | p->cq_off.overflow = offsetof(struct io_rings, cq_overflow); | |
12559 | p->cq_off.cqes = offsetof(struct io_rings, cqes); | |
0d9b5b3a | 12560 | p->cq_off.flags = offsetof(struct io_rings, cq_flags); |
ac90f249 | 12561 | |
7f13657d XW |
12562 | p->features = IORING_FEAT_SINGLE_MMAP | IORING_FEAT_NODROP | |
12563 | IORING_FEAT_SUBMIT_STABLE | IORING_FEAT_RW_CUR_POS | | |
5769a351 | 12564 | IORING_FEAT_CUR_PERSONALITY | IORING_FEAT_FAST_POLL | |
c73ebb68 | 12565 | IORING_FEAT_POLL_32BITS | IORING_FEAT_SQPOLL_NONFIXED | |
9690557e | 12566 | IORING_FEAT_EXT_ARG | IORING_FEAT_NATIVE_WORKERS | |
c4212f3e JA |
12567 | IORING_FEAT_RSRC_TAGS | IORING_FEAT_CQE_SKIP | |
12568 | IORING_FEAT_LINKED_FILE; | |
7f13657d XW |
12569 | |
12570 | if (copy_to_user(params, p, sizeof(*p))) { | |
12571 | ret = -EFAULT; | |
12572 | goto err; | |
12573 | } | |
d1719f70 | 12574 | |
9faadcc8 PB |
12575 | file = io_uring_get_file(ctx); |
12576 | if (IS_ERR(file)) { | |
12577 | ret = PTR_ERR(file); | |
12578 | goto err; | |
12579 | } | |
12580 | ||
044c1ab3 JA |
12581 | /* |
12582 | * Install ring fd as the very last thing, so we don't risk someone | |
12583 | * having closed it before we finish setup | |
12584 | */ | |
9faadcc8 PB |
12585 | ret = io_uring_install_fd(ctx, file); |
12586 | if (ret < 0) { | |
12587 | /* fput will clean it up */ | |
12588 | fput(file); | |
12589 | return ret; | |
12590 | } | |
044c1ab3 | 12591 | |
c826bd7a | 12592 | trace_io_uring_create(ret, ctx, p->sq_entries, p->cq_entries, p->flags); |
2b188cc1 JA |
12593 | return ret; |
12594 | err: | |
12595 | io_ring_ctx_wait_and_kill(ctx); | |
12596 | return ret; | |
12597 | } | |
12598 | ||
12599 | /* | |
12600 | * Sets up an aio uring context, and returns the fd. Applications asks for a | |
12601 | * ring size, we return the actual sq/cq ring sizes (among other things) in the | |
12602 | * params structure passed in. | |
12603 | */ | |
12604 | static long io_uring_setup(u32 entries, struct io_uring_params __user *params) | |
12605 | { | |
12606 | struct io_uring_params p; | |
2b188cc1 JA |
12607 | int i; |
12608 | ||
12609 | if (copy_from_user(&p, params, sizeof(p))) | |
12610 | return -EFAULT; | |
12611 | for (i = 0; i < ARRAY_SIZE(p.resv); i++) { | |
12612 | if (p.resv[i]) | |
12613 | return -EINVAL; | |
12614 | } | |
12615 | ||
6c271ce2 | 12616 | if (p.flags & ~(IORING_SETUP_IOPOLL | IORING_SETUP_SQPOLL | |
8110c1a6 | 12617 | IORING_SETUP_SQ_AFF | IORING_SETUP_CQSIZE | |
7e84e1c7 | 12618 | IORING_SETUP_CLAMP | IORING_SETUP_ATTACH_WQ | |
e1169f06 | 12619 | IORING_SETUP_R_DISABLED | IORING_SETUP_SUBMIT_ALL | |
ebdeb7c0 | 12620 | IORING_SETUP_COOP_TASKRUN | IORING_SETUP_TASKRUN_FLAG | |
76c68fbf | 12621 | IORING_SETUP_SQE128 | IORING_SETUP_CQE32)) |
2b188cc1 JA |
12622 | return -EINVAL; |
12623 | ||
ef060ea9 | 12624 | return io_uring_create(entries, &p, params); |
2b188cc1 JA |
12625 | } |
12626 | ||
12627 | SYSCALL_DEFINE2(io_uring_setup, u32, entries, | |
12628 | struct io_uring_params __user *, params) | |
12629 | { | |
12630 | return io_uring_setup(entries, params); | |
12631 | } | |
12632 | ||
c072481d PB |
12633 | static __cold int io_probe(struct io_ring_ctx *ctx, void __user *arg, |
12634 | unsigned nr_args) | |
66f4af93 JA |
12635 | { |
12636 | struct io_uring_probe *p; | |
12637 | size_t size; | |
12638 | int i, ret; | |
12639 | ||
12640 | size = struct_size(p, ops, nr_args); | |
12641 | if (size == SIZE_MAX) | |
12642 | return -EOVERFLOW; | |
12643 | p = kzalloc(size, GFP_KERNEL); | |
12644 | if (!p) | |
12645 | return -ENOMEM; | |
12646 | ||
12647 | ret = -EFAULT; | |
12648 | if (copy_from_user(p, arg, size)) | |
12649 | goto out; | |
12650 | ret = -EINVAL; | |
12651 | if (memchr_inv(p, 0, size)) | |
12652 | goto out; | |
12653 | ||
12654 | p->last_op = IORING_OP_LAST - 1; | |
12655 | if (nr_args > IORING_OP_LAST) | |
12656 | nr_args = IORING_OP_LAST; | |
12657 | ||
12658 | for (i = 0; i < nr_args; i++) { | |
12659 | p->ops[i].op = i; | |
12660 | if (!io_op_defs[i].not_supported) | |
12661 | p->ops[i].flags = IO_URING_OP_SUPPORTED; | |
12662 | } | |
12663 | p->ops_len = i; | |
12664 | ||
12665 | ret = 0; | |
12666 | if (copy_to_user(arg, p, size)) | |
12667 | ret = -EFAULT; | |
12668 | out: | |
12669 | kfree(p); | |
12670 | return ret; | |
12671 | } | |
12672 | ||
071698e1 JA |
12673 | static int io_register_personality(struct io_ring_ctx *ctx) |
12674 | { | |
4379bf8b | 12675 | const struct cred *creds; |
61cf9370 | 12676 | u32 id; |
1e6fa521 | 12677 | int ret; |
071698e1 | 12678 | |
4379bf8b | 12679 | creds = get_current_cred(); |
1e6fa521 | 12680 | |
61cf9370 MWO |
12681 | ret = xa_alloc_cyclic(&ctx->personalities, &id, (void *)creds, |
12682 | XA_LIMIT(0, USHRT_MAX), &ctx->pers_next, GFP_KERNEL); | |
a30f895a JA |
12683 | if (ret < 0) { |
12684 | put_cred(creds); | |
12685 | return ret; | |
12686 | } | |
12687 | return id; | |
071698e1 JA |
12688 | } |
12689 | ||
c072481d PB |
12690 | static __cold int io_register_restrictions(struct io_ring_ctx *ctx, |
12691 | void __user *arg, unsigned int nr_args) | |
21b55dbc SG |
12692 | { |
12693 | struct io_uring_restriction *res; | |
12694 | size_t size; | |
12695 | int i, ret; | |
12696 | ||
7e84e1c7 SG |
12697 | /* Restrictions allowed only if rings started disabled */ |
12698 | if (!(ctx->flags & IORING_SETUP_R_DISABLED)) | |
12699 | return -EBADFD; | |
12700 | ||
21b55dbc | 12701 | /* We allow only a single restrictions registration */ |
7e84e1c7 | 12702 | if (ctx->restrictions.registered) |
21b55dbc SG |
12703 | return -EBUSY; |
12704 | ||
12705 | if (!arg || nr_args > IORING_MAX_RESTRICTIONS) | |
12706 | return -EINVAL; | |
12707 | ||
12708 | size = array_size(nr_args, sizeof(*res)); | |
12709 | if (size == SIZE_MAX) | |
12710 | return -EOVERFLOW; | |
12711 | ||
12712 | res = memdup_user(arg, size); | |
12713 | if (IS_ERR(res)) | |
12714 | return PTR_ERR(res); | |
12715 | ||
12716 | ret = 0; | |
12717 | ||
12718 | for (i = 0; i < nr_args; i++) { | |
12719 | switch (res[i].opcode) { | |
12720 | case IORING_RESTRICTION_REGISTER_OP: | |
12721 | if (res[i].register_op >= IORING_REGISTER_LAST) { | |
12722 | ret = -EINVAL; | |
12723 | goto out; | |
12724 | } | |
12725 | ||
12726 | __set_bit(res[i].register_op, | |
12727 | ctx->restrictions.register_op); | |
12728 | break; | |
12729 | case IORING_RESTRICTION_SQE_OP: | |
12730 | if (res[i].sqe_op >= IORING_OP_LAST) { | |
12731 | ret = -EINVAL; | |
12732 | goto out; | |
12733 | } | |
12734 | ||
12735 | __set_bit(res[i].sqe_op, ctx->restrictions.sqe_op); | |
12736 | break; | |
12737 | case IORING_RESTRICTION_SQE_FLAGS_ALLOWED: | |
12738 | ctx->restrictions.sqe_flags_allowed = res[i].sqe_flags; | |
12739 | break; | |
12740 | case IORING_RESTRICTION_SQE_FLAGS_REQUIRED: | |
12741 | ctx->restrictions.sqe_flags_required = res[i].sqe_flags; | |
12742 | break; | |
12743 | default: | |
12744 | ret = -EINVAL; | |
12745 | goto out; | |
12746 | } | |
12747 | } | |
12748 | ||
12749 | out: | |
12750 | /* Reset all restrictions if an error happened */ | |
12751 | if (ret != 0) | |
12752 | memset(&ctx->restrictions, 0, sizeof(ctx->restrictions)); | |
12753 | else | |
7e84e1c7 | 12754 | ctx->restrictions.registered = true; |
21b55dbc SG |
12755 | |
12756 | kfree(res); | |
12757 | return ret; | |
12758 | } | |
12759 | ||
7e84e1c7 SG |
12760 | static int io_register_enable_rings(struct io_ring_ctx *ctx) |
12761 | { | |
12762 | if (!(ctx->flags & IORING_SETUP_R_DISABLED)) | |
12763 | return -EBADFD; | |
12764 | ||
12765 | if (ctx->restrictions.registered) | |
12766 | ctx->restricted = 1; | |
12767 | ||
0298ef96 PB |
12768 | ctx->flags &= ~IORING_SETUP_R_DISABLED; |
12769 | if (ctx->sq_data && wq_has_sleeper(&ctx->sq_data->wait)) | |
12770 | wake_up(&ctx->sq_data->wait); | |
7e84e1c7 SG |
12771 | return 0; |
12772 | } | |
12773 | ||
fdecb662 | 12774 | static int __io_register_rsrc_update(struct io_ring_ctx *ctx, unsigned type, |
c3bdad02 | 12775 | struct io_uring_rsrc_update2 *up, |
98f0b3b4 PB |
12776 | unsigned nr_args) |
12777 | { | |
12778 | __u32 tmp; | |
12779 | int err; | |
12780 | ||
12781 | if (check_add_overflow(up->offset, nr_args, &tmp)) | |
12782 | return -EOVERFLOW; | |
12783 | err = io_rsrc_node_switch_start(ctx); | |
12784 | if (err) | |
12785 | return err; | |
12786 | ||
fdecb662 PB |
12787 | switch (type) { |
12788 | case IORING_RSRC_FILE: | |
98f0b3b4 | 12789 | return __io_sqe_files_update(ctx, up, nr_args); |
634d00df PB |
12790 | case IORING_RSRC_BUFFER: |
12791 | return __io_sqe_buffers_update(ctx, up, nr_args); | |
98f0b3b4 PB |
12792 | } |
12793 | return -EINVAL; | |
12794 | } | |
12795 | ||
c3bdad02 PB |
12796 | static int io_register_files_update(struct io_ring_ctx *ctx, void __user *arg, |
12797 | unsigned nr_args) | |
98f0b3b4 | 12798 | { |
c3bdad02 | 12799 | struct io_uring_rsrc_update2 up; |
98f0b3b4 PB |
12800 | |
12801 | if (!nr_args) | |
12802 | return -EINVAL; | |
c3bdad02 PB |
12803 | memset(&up, 0, sizeof(up)); |
12804 | if (copy_from_user(&up, arg, sizeof(struct io_uring_rsrc_update))) | |
12805 | return -EFAULT; | |
d8a3ba9c | 12806 | if (up.resv || up.resv2) |
565c5e61 | 12807 | return -EINVAL; |
c3bdad02 PB |
12808 | return __io_register_rsrc_update(ctx, IORING_RSRC_FILE, &up, nr_args); |
12809 | } | |
12810 | ||
12811 | static int io_register_rsrc_update(struct io_ring_ctx *ctx, void __user *arg, | |
992da01a | 12812 | unsigned size, unsigned type) |
c3bdad02 PB |
12813 | { |
12814 | struct io_uring_rsrc_update2 up; | |
12815 | ||
12816 | if (size != sizeof(up)) | |
12817 | return -EINVAL; | |
98f0b3b4 PB |
12818 | if (copy_from_user(&up, arg, sizeof(up))) |
12819 | return -EFAULT; | |
d8a3ba9c | 12820 | if (!up.nr || up.resv || up.resv2) |
98f0b3b4 | 12821 | return -EINVAL; |
992da01a | 12822 | return __io_register_rsrc_update(ctx, type, &up, up.nr); |
98f0b3b4 PB |
12823 | } |
12824 | ||
c072481d | 12825 | static __cold int io_register_rsrc(struct io_ring_ctx *ctx, void __user *arg, |
992da01a | 12826 | unsigned int size, unsigned int type) |
792e3582 PB |
12827 | { |
12828 | struct io_uring_rsrc_register rr; | |
12829 | ||
12830 | /* keep it extendible */ | |
12831 | if (size != sizeof(rr)) | |
12832 | return -EINVAL; | |
12833 | ||
12834 | memset(&rr, 0, sizeof(rr)); | |
12835 | if (copy_from_user(&rr, arg, size)) | |
12836 | return -EFAULT; | |
a8da73a3 JA |
12837 | if (!rr.nr || rr.resv2) |
12838 | return -EINVAL; | |
12839 | if (rr.flags & ~IORING_RSRC_REGISTER_SPARSE) | |
792e3582 PB |
12840 | return -EINVAL; |
12841 | ||
992da01a | 12842 | switch (type) { |
792e3582 | 12843 | case IORING_RSRC_FILE: |
a8da73a3 JA |
12844 | if (rr.flags & IORING_RSRC_REGISTER_SPARSE && rr.data) |
12845 | break; | |
792e3582 PB |
12846 | return io_sqe_files_register(ctx, u64_to_user_ptr(rr.data), |
12847 | rr.nr, u64_to_user_ptr(rr.tags)); | |
634d00df | 12848 | case IORING_RSRC_BUFFER: |
0184f08e | 12849 | if (rr.flags & IORING_RSRC_REGISTER_SPARSE && rr.data) |
a8da73a3 | 12850 | break; |
634d00df PB |
12851 | return io_sqe_buffers_register(ctx, u64_to_user_ptr(rr.data), |
12852 | rr.nr, u64_to_user_ptr(rr.tags)); | |
792e3582 PB |
12853 | } |
12854 | return -EINVAL; | |
12855 | } | |
12856 | ||
c072481d PB |
12857 | static __cold int io_register_iowq_aff(struct io_ring_ctx *ctx, |
12858 | void __user *arg, unsigned len) | |
fe76421d JA |
12859 | { |
12860 | struct io_uring_task *tctx = current->io_uring; | |
12861 | cpumask_var_t new_mask; | |
12862 | int ret; | |
12863 | ||
12864 | if (!tctx || !tctx->io_wq) | |
12865 | return -EINVAL; | |
12866 | ||
12867 | if (!alloc_cpumask_var(&new_mask, GFP_KERNEL)) | |
12868 | return -ENOMEM; | |
12869 | ||
12870 | cpumask_clear(new_mask); | |
12871 | if (len > cpumask_size()) | |
12872 | len = cpumask_size(); | |
12873 | ||
0f5e4b83 ES |
12874 | if (in_compat_syscall()) { |
12875 | ret = compat_get_bitmap(cpumask_bits(new_mask), | |
12876 | (const compat_ulong_t __user *)arg, | |
12877 | len * 8 /* CHAR_BIT */); | |
12878 | } else { | |
12879 | ret = copy_from_user(new_mask, arg, len); | |
12880 | } | |
12881 | ||
12882 | if (ret) { | |
fe76421d JA |
12883 | free_cpumask_var(new_mask); |
12884 | return -EFAULT; | |
12885 | } | |
12886 | ||
12887 | ret = io_wq_cpu_affinity(tctx->io_wq, new_mask); | |
12888 | free_cpumask_var(new_mask); | |
12889 | return ret; | |
12890 | } | |
12891 | ||
c072481d | 12892 | static __cold int io_unregister_iowq_aff(struct io_ring_ctx *ctx) |
fe76421d JA |
12893 | { |
12894 | struct io_uring_task *tctx = current->io_uring; | |
12895 | ||
12896 | if (!tctx || !tctx->io_wq) | |
12897 | return -EINVAL; | |
12898 | ||
12899 | return io_wq_cpu_affinity(tctx->io_wq, NULL); | |
12900 | } | |
12901 | ||
c072481d PB |
12902 | static __cold int io_register_iowq_max_workers(struct io_ring_ctx *ctx, |
12903 | void __user *arg) | |
b22fa62a | 12904 | __must_hold(&ctx->uring_lock) |
2e480058 | 12905 | { |
b22fa62a | 12906 | struct io_tctx_node *node; |
fa84693b JA |
12907 | struct io_uring_task *tctx = NULL; |
12908 | struct io_sq_data *sqd = NULL; | |
2e480058 JA |
12909 | __u32 new_count[2]; |
12910 | int i, ret; | |
12911 | ||
2e480058 JA |
12912 | if (copy_from_user(new_count, arg, sizeof(new_count))) |
12913 | return -EFAULT; | |
12914 | for (i = 0; i < ARRAY_SIZE(new_count); i++) | |
12915 | if (new_count[i] > INT_MAX) | |
12916 | return -EINVAL; | |
12917 | ||
fa84693b JA |
12918 | if (ctx->flags & IORING_SETUP_SQPOLL) { |
12919 | sqd = ctx->sq_data; | |
12920 | if (sqd) { | |
009ad9f0 JA |
12921 | /* |
12922 | * Observe the correct sqd->lock -> ctx->uring_lock | |
12923 | * ordering. Fine to drop uring_lock here, we hold | |
12924 | * a ref to the ctx. | |
12925 | */ | |
41d3a6bd | 12926 | refcount_inc(&sqd->refs); |
009ad9f0 | 12927 | mutex_unlock(&ctx->uring_lock); |
fa84693b | 12928 | mutex_lock(&sqd->lock); |
009ad9f0 | 12929 | mutex_lock(&ctx->uring_lock); |
41d3a6bd JA |
12930 | if (sqd->thread) |
12931 | tctx = sqd->thread->io_uring; | |
fa84693b JA |
12932 | } |
12933 | } else { | |
12934 | tctx = current->io_uring; | |
12935 | } | |
12936 | ||
e139a1ec | 12937 | BUILD_BUG_ON(sizeof(new_count) != sizeof(ctx->iowq_limits)); |
fa84693b | 12938 | |
bad119b9 PB |
12939 | for (i = 0; i < ARRAY_SIZE(new_count); i++) |
12940 | if (new_count[i]) | |
12941 | ctx->iowq_limits[i] = new_count[i]; | |
e139a1ec PB |
12942 | ctx->iowq_limits_set = true; |
12943 | ||
e139a1ec PB |
12944 | if (tctx && tctx->io_wq) { |
12945 | ret = io_wq_max_workers(tctx->io_wq, new_count); | |
12946 | if (ret) | |
12947 | goto err; | |
12948 | } else { | |
12949 | memset(new_count, 0, sizeof(new_count)); | |
12950 | } | |
fa84693b | 12951 | |
41d3a6bd | 12952 | if (sqd) { |
fa84693b | 12953 | mutex_unlock(&sqd->lock); |
41d3a6bd JA |
12954 | io_put_sq_data(sqd); |
12955 | } | |
2e480058 JA |
12956 | |
12957 | if (copy_to_user(arg, new_count, sizeof(new_count))) | |
12958 | return -EFAULT; | |
12959 | ||
b22fa62a PB |
12960 | /* that's it for SQPOLL, only the SQPOLL task creates requests */ |
12961 | if (sqd) | |
12962 | return 0; | |
12963 | ||
12964 | /* now propagate the restriction to all registered users */ | |
12965 | list_for_each_entry(node, &ctx->tctx_list, ctx_node) { | |
12966 | struct io_uring_task *tctx = node->task->io_uring; | |
12967 | ||
12968 | if (WARN_ON_ONCE(!tctx->io_wq)) | |
12969 | continue; | |
12970 | ||
12971 | for (i = 0; i < ARRAY_SIZE(new_count); i++) | |
12972 | new_count[i] = ctx->iowq_limits[i]; | |
12973 | /* ignore errors, it always returns zero anyway */ | |
12974 | (void)io_wq_max_workers(tctx->io_wq, new_count); | |
12975 | } | |
2e480058 | 12976 | return 0; |
fa84693b | 12977 | err: |
41d3a6bd | 12978 | if (sqd) { |
fa84693b | 12979 | mutex_unlock(&sqd->lock); |
41d3a6bd JA |
12980 | io_put_sq_data(sqd); |
12981 | } | |
fa84693b | 12982 | return ret; |
2e480058 JA |
12983 | } |
12984 | ||
c7fb1942 JA |
12985 | static int io_register_pbuf_ring(struct io_ring_ctx *ctx, void __user *arg) |
12986 | { | |
12987 | struct io_uring_buf_ring *br; | |
12988 | struct io_uring_buf_reg reg; | |
12989 | struct io_buffer_list *bl; | |
12990 | struct page **pages; | |
12991 | int nr_pages; | |
12992 | ||
12993 | if (copy_from_user(®, arg, sizeof(reg))) | |
12994 | return -EFAULT; | |
12995 | ||
12996 | if (reg.pad || reg.resv[0] || reg.resv[1] || reg.resv[2]) | |
12997 | return -EINVAL; | |
12998 | if (!reg.ring_addr) | |
12999 | return -EFAULT; | |
13000 | if (reg.ring_addr & ~PAGE_MASK) | |
13001 | return -EINVAL; | |
13002 | if (!is_power_of_2(reg.ring_entries)) | |
13003 | return -EINVAL; | |
13004 | ||
13005 | if (unlikely(reg.bgid < BGID_ARRAY && !ctx->io_bl)) { | |
13006 | int ret = io_init_bl_list(ctx); | |
13007 | if (ret) | |
13008 | return ret; | |
13009 | } | |
13010 | ||
13011 | bl = io_buffer_get_list(ctx, reg.bgid); | |
2fcabce2 JA |
13012 | if (bl) { |
13013 | /* if mapped buffer ring OR classic exists, don't allow */ | |
13014 | if (bl->buf_nr_pages || !list_empty(&bl->buf_list)) | |
13015 | return -EEXIST; | |
13016 | } else { | |
c7fb1942 JA |
13017 | bl = kzalloc(sizeof(*bl), GFP_KERNEL); |
13018 | if (!bl) | |
13019 | return -ENOMEM; | |
13020 | } | |
13021 | ||
13022 | pages = io_pin_pages(reg.ring_addr, | |
13023 | struct_size(br, bufs, reg.ring_entries), | |
13024 | &nr_pages); | |
13025 | if (IS_ERR(pages)) { | |
13026 | kfree(bl); | |
13027 | return PTR_ERR(pages); | |
13028 | } | |
13029 | ||
13030 | br = page_address(pages[0]); | |
13031 | bl->buf_pages = pages; | |
13032 | bl->buf_nr_pages = nr_pages; | |
13033 | bl->nr_entries = reg.ring_entries; | |
13034 | bl->buf_ring = br; | |
13035 | bl->mask = reg.ring_entries - 1; | |
13036 | io_buffer_add_list(ctx, bl, reg.bgid); | |
13037 | return 0; | |
13038 | } | |
13039 | ||
13040 | static int io_unregister_pbuf_ring(struct io_ring_ctx *ctx, void __user *arg) | |
13041 | { | |
13042 | struct io_uring_buf_reg reg; | |
13043 | struct io_buffer_list *bl; | |
13044 | ||
13045 | if (copy_from_user(®, arg, sizeof(reg))) | |
13046 | return -EFAULT; | |
13047 | if (reg.pad || reg.resv[0] || reg.resv[1] || reg.resv[2]) | |
13048 | return -EINVAL; | |
13049 | ||
13050 | bl = io_buffer_get_list(ctx, reg.bgid); | |
13051 | if (!bl) | |
13052 | return -ENOENT; | |
13053 | if (!bl->buf_nr_pages) | |
13054 | return -EINVAL; | |
13055 | ||
13056 | __io_remove_buffers(ctx, bl, -1U); | |
13057 | if (bl->bgid >= BGID_ARRAY) { | |
13058 | xa_erase(&ctx->io_bl_xa, bl->bgid); | |
13059 | kfree(bl); | |
13060 | } | |
13061 | return 0; | |
13062 | } | |
13063 | ||
edafccee JA |
13064 | static int __io_uring_register(struct io_ring_ctx *ctx, unsigned opcode, |
13065 | void __user *arg, unsigned nr_args) | |
b19062a5 JA |
13066 | __releases(ctx->uring_lock) |
13067 | __acquires(ctx->uring_lock) | |
edafccee JA |
13068 | { |
13069 | int ret; | |
13070 | ||
35fa71a0 JA |
13071 | /* |
13072 | * We're inside the ring mutex, if the ref is already dying, then | |
13073 | * someone else killed the ctx or is already going through | |
13074 | * io_uring_register(). | |
13075 | */ | |
13076 | if (percpu_ref_is_dying(&ctx->refs)) | |
13077 | return -ENXIO; | |
13078 | ||
75c4021a PB |
13079 | if (ctx->restricted) { |
13080 | if (opcode >= IORING_REGISTER_LAST) | |
13081 | return -EINVAL; | |
13082 | opcode = array_index_nospec(opcode, IORING_REGISTER_LAST); | |
13083 | if (!test_bit(opcode, ctx->restrictions.register_op)) | |
13084 | return -EACCES; | |
13085 | } | |
13086 | ||
edafccee JA |
13087 | switch (opcode) { |
13088 | case IORING_REGISTER_BUFFERS: | |
0184f08e PB |
13089 | ret = -EFAULT; |
13090 | if (!arg) | |
13091 | break; | |
634d00df | 13092 | ret = io_sqe_buffers_register(ctx, arg, nr_args, NULL); |
edafccee JA |
13093 | break; |
13094 | case IORING_UNREGISTER_BUFFERS: | |
13095 | ret = -EINVAL; | |
13096 | if (arg || nr_args) | |
13097 | break; | |
0a96bbe4 | 13098 | ret = io_sqe_buffers_unregister(ctx); |
edafccee | 13099 | break; |
6b06314c | 13100 | case IORING_REGISTER_FILES: |
a8da73a3 JA |
13101 | ret = -EFAULT; |
13102 | if (!arg) | |
13103 | break; | |
792e3582 | 13104 | ret = io_sqe_files_register(ctx, arg, nr_args, NULL); |
6b06314c JA |
13105 | break; |
13106 | case IORING_UNREGISTER_FILES: | |
13107 | ret = -EINVAL; | |
13108 | if (arg || nr_args) | |
13109 | break; | |
13110 | ret = io_sqe_files_unregister(ctx); | |
13111 | break; | |
c3a31e60 | 13112 | case IORING_REGISTER_FILES_UPDATE: |
c3bdad02 | 13113 | ret = io_register_files_update(ctx, arg, nr_args); |
c3a31e60 | 13114 | break; |
9b402849 JA |
13115 | case IORING_REGISTER_EVENTFD: |
13116 | ret = -EINVAL; | |
13117 | if (nr_args != 1) | |
13118 | break; | |
c75312dd UA |
13119 | ret = io_eventfd_register(ctx, arg, 0); |
13120 | break; | |
13121 | case IORING_REGISTER_EVENTFD_ASYNC: | |
13122 | ret = -EINVAL; | |
13123 | if (nr_args != 1) | |
f2842ab5 | 13124 | break; |
c75312dd | 13125 | ret = io_eventfd_register(ctx, arg, 1); |
9b402849 JA |
13126 | break; |
13127 | case IORING_UNREGISTER_EVENTFD: | |
13128 | ret = -EINVAL; | |
13129 | if (arg || nr_args) | |
13130 | break; | |
13131 | ret = io_eventfd_unregister(ctx); | |
13132 | break; | |
66f4af93 JA |
13133 | case IORING_REGISTER_PROBE: |
13134 | ret = -EINVAL; | |
13135 | if (!arg || nr_args > 256) | |
13136 | break; | |
13137 | ret = io_probe(ctx, arg, nr_args); | |
13138 | break; | |
071698e1 JA |
13139 | case IORING_REGISTER_PERSONALITY: |
13140 | ret = -EINVAL; | |
13141 | if (arg || nr_args) | |
13142 | break; | |
13143 | ret = io_register_personality(ctx); | |
13144 | break; | |
13145 | case IORING_UNREGISTER_PERSONALITY: | |
13146 | ret = -EINVAL; | |
13147 | if (arg) | |
13148 | break; | |
13149 | ret = io_unregister_personality(ctx, nr_args); | |
13150 | break; | |
7e84e1c7 SG |
13151 | case IORING_REGISTER_ENABLE_RINGS: |
13152 | ret = -EINVAL; | |
13153 | if (arg || nr_args) | |
13154 | break; | |
13155 | ret = io_register_enable_rings(ctx); | |
13156 | break; | |
21b55dbc SG |
13157 | case IORING_REGISTER_RESTRICTIONS: |
13158 | ret = io_register_restrictions(ctx, arg, nr_args); | |
13159 | break; | |
992da01a PB |
13160 | case IORING_REGISTER_FILES2: |
13161 | ret = io_register_rsrc(ctx, arg, nr_args, IORING_RSRC_FILE); | |
13162 | break; | |
13163 | case IORING_REGISTER_FILES_UPDATE2: | |
13164 | ret = io_register_rsrc_update(ctx, arg, nr_args, | |
13165 | IORING_RSRC_FILE); | |
13166 | break; | |
13167 | case IORING_REGISTER_BUFFERS2: | |
13168 | ret = io_register_rsrc(ctx, arg, nr_args, IORING_RSRC_BUFFER); | |
792e3582 | 13169 | break; |
992da01a PB |
13170 | case IORING_REGISTER_BUFFERS_UPDATE: |
13171 | ret = io_register_rsrc_update(ctx, arg, nr_args, | |
13172 | IORING_RSRC_BUFFER); | |
c3bdad02 | 13173 | break; |
fe76421d JA |
13174 | case IORING_REGISTER_IOWQ_AFF: |
13175 | ret = -EINVAL; | |
13176 | if (!arg || !nr_args) | |
13177 | break; | |
13178 | ret = io_register_iowq_aff(ctx, arg, nr_args); | |
13179 | break; | |
13180 | case IORING_UNREGISTER_IOWQ_AFF: | |
13181 | ret = -EINVAL; | |
13182 | if (arg || nr_args) | |
13183 | break; | |
13184 | ret = io_unregister_iowq_aff(ctx); | |
13185 | break; | |
2e480058 JA |
13186 | case IORING_REGISTER_IOWQ_MAX_WORKERS: |
13187 | ret = -EINVAL; | |
13188 | if (!arg || nr_args != 2) | |
13189 | break; | |
13190 | ret = io_register_iowq_max_workers(ctx, arg); | |
13191 | break; | |
e7a6c00d JA |
13192 | case IORING_REGISTER_RING_FDS: |
13193 | ret = io_ringfd_register(ctx, arg, nr_args); | |
13194 | break; | |
13195 | case IORING_UNREGISTER_RING_FDS: | |
13196 | ret = io_ringfd_unregister(ctx, arg, nr_args); | |
13197 | break; | |
c7fb1942 JA |
13198 | case IORING_REGISTER_PBUF_RING: |
13199 | ret = -EINVAL; | |
13200 | if (!arg || nr_args != 1) | |
13201 | break; | |
13202 | ret = io_register_pbuf_ring(ctx, arg); | |
13203 | break; | |
13204 | case IORING_UNREGISTER_PBUF_RING: | |
13205 | ret = -EINVAL; | |
13206 | if (!arg || nr_args != 1) | |
13207 | break; | |
13208 | ret = io_unregister_pbuf_ring(ctx, arg); | |
13209 | break; | |
edafccee JA |
13210 | default: |
13211 | ret = -EINVAL; | |
13212 | break; | |
13213 | } | |
13214 | ||
edafccee JA |
13215 | return ret; |
13216 | } | |
13217 | ||
13218 | SYSCALL_DEFINE4(io_uring_register, unsigned int, fd, unsigned int, opcode, | |
13219 | void __user *, arg, unsigned int, nr_args) | |
13220 | { | |
13221 | struct io_ring_ctx *ctx; | |
13222 | long ret = -EBADF; | |
13223 | struct fd f; | |
13224 | ||
13225 | f = fdget(fd); | |
13226 | if (!f.file) | |
13227 | return -EBADF; | |
13228 | ||
13229 | ret = -EOPNOTSUPP; | |
13230 | if (f.file->f_op != &io_uring_fops) | |
13231 | goto out_fput; | |
13232 | ||
13233 | ctx = f.file->private_data; | |
13234 | ||
b6c23dd5 PB |
13235 | io_run_task_work(); |
13236 | ||
edafccee JA |
13237 | mutex_lock(&ctx->uring_lock); |
13238 | ret = __io_uring_register(ctx, opcode, arg, nr_args); | |
13239 | mutex_unlock(&ctx->uring_lock); | |
2757be22 | 13240 | trace_io_uring_register(ctx, opcode, ctx->nr_user_files, ctx->nr_user_bufs, ret); |
edafccee JA |
13241 | out_fput: |
13242 | fdput(f); | |
13243 | return ret; | |
13244 | } | |
13245 | ||
2b188cc1 JA |
13246 | static int __init io_uring_init(void) |
13247 | { | |
d7f62e82 SM |
13248 | #define __BUILD_BUG_VERIFY_ELEMENT(stype, eoffset, etype, ename) do { \ |
13249 | BUILD_BUG_ON(offsetof(stype, ename) != eoffset); \ | |
13250 | BUILD_BUG_ON(sizeof(etype) != sizeof_field(stype, ename)); \ | |
13251 | } while (0) | |
13252 | ||
13253 | #define BUILD_BUG_SQE_ELEM(eoffset, etype, ename) \ | |
13254 | __BUILD_BUG_VERIFY_ELEMENT(struct io_uring_sqe, eoffset, etype, ename) | |
13255 | BUILD_BUG_ON(sizeof(struct io_uring_sqe) != 64); | |
13256 | BUILD_BUG_SQE_ELEM(0, __u8, opcode); | |
13257 | BUILD_BUG_SQE_ELEM(1, __u8, flags); | |
13258 | BUILD_BUG_SQE_ELEM(2, __u16, ioprio); | |
13259 | BUILD_BUG_SQE_ELEM(4, __s32, fd); | |
13260 | BUILD_BUG_SQE_ELEM(8, __u64, off); | |
13261 | BUILD_BUG_SQE_ELEM(8, __u64, addr2); | |
13262 | BUILD_BUG_SQE_ELEM(16, __u64, addr); | |
7d67af2c | 13263 | BUILD_BUG_SQE_ELEM(16, __u64, splice_off_in); |
d7f62e82 SM |
13264 | BUILD_BUG_SQE_ELEM(24, __u32, len); |
13265 | BUILD_BUG_SQE_ELEM(28, __kernel_rwf_t, rw_flags); | |
13266 | BUILD_BUG_SQE_ELEM(28, /* compat */ int, rw_flags); | |
13267 | BUILD_BUG_SQE_ELEM(28, /* compat */ __u32, rw_flags); | |
13268 | BUILD_BUG_SQE_ELEM(28, __u32, fsync_flags); | |
5769a351 JX |
13269 | BUILD_BUG_SQE_ELEM(28, /* compat */ __u16, poll_events); |
13270 | BUILD_BUG_SQE_ELEM(28, __u32, poll32_events); | |
d7f62e82 SM |
13271 | BUILD_BUG_SQE_ELEM(28, __u32, sync_range_flags); |
13272 | BUILD_BUG_SQE_ELEM(28, __u32, msg_flags); | |
13273 | BUILD_BUG_SQE_ELEM(28, __u32, timeout_flags); | |
13274 | BUILD_BUG_SQE_ELEM(28, __u32, accept_flags); | |
13275 | BUILD_BUG_SQE_ELEM(28, __u32, cancel_flags); | |
13276 | BUILD_BUG_SQE_ELEM(28, __u32, open_flags); | |
13277 | BUILD_BUG_SQE_ELEM(28, __u32, statx_flags); | |
13278 | BUILD_BUG_SQE_ELEM(28, __u32, fadvise_advice); | |
7d67af2c | 13279 | BUILD_BUG_SQE_ELEM(28, __u32, splice_flags); |
d7f62e82 SM |
13280 | BUILD_BUG_SQE_ELEM(32, __u64, user_data); |
13281 | BUILD_BUG_SQE_ELEM(40, __u16, buf_index); | |
16340eab | 13282 | BUILD_BUG_SQE_ELEM(40, __u16, buf_group); |
d7f62e82 | 13283 | BUILD_BUG_SQE_ELEM(42, __u16, personality); |
7d67af2c | 13284 | BUILD_BUG_SQE_ELEM(44, __s32, splice_fd_in); |
b9445598 | 13285 | BUILD_BUG_SQE_ELEM(44, __u32, file_index); |
e9621e2b | 13286 | BUILD_BUG_SQE_ELEM(48, __u64, addr3); |
d7f62e82 | 13287 | |
b0d658ec PB |
13288 | BUILD_BUG_ON(sizeof(struct io_uring_files_update) != |
13289 | sizeof(struct io_uring_rsrc_update)); | |
13290 | BUILD_BUG_ON(sizeof(struct io_uring_rsrc_update) > | |
13291 | sizeof(struct io_uring_rsrc_update2)); | |
90499ad0 PB |
13292 | |
13293 | /* ->buf_index is u16 */ | |
13294 | BUILD_BUG_ON(IORING_MAX_REG_BUFFERS >= (1u << 16)); | |
9cfc7e94 | 13295 | BUILD_BUG_ON(BGID_ARRAY * sizeof(struct io_buffer_list) > PAGE_SIZE); |
c7fb1942 JA |
13296 | BUILD_BUG_ON(offsetof(struct io_uring_buf_ring, bufs) != 0); |
13297 | BUILD_BUG_ON(offsetof(struct io_uring_buf, resv) != | |
13298 | offsetof(struct io_uring_buf_ring, tail)); | |
90499ad0 | 13299 | |
b0d658ec PB |
13300 | /* should fit into one byte */ |
13301 | BUILD_BUG_ON(SQE_VALID_FLAGS >= (1 << 8)); | |
68fe256a PB |
13302 | BUILD_BUG_ON(SQE_COMMON_FLAGS >= (1 << 8)); |
13303 | BUILD_BUG_ON((SQE_VALID_FLAGS | SQE_COMMON_FLAGS) != SQE_VALID_FLAGS); | |
b0d658ec | 13304 | |
d3656344 | 13305 | BUILD_BUG_ON(ARRAY_SIZE(io_op_defs) != IORING_OP_LAST); |
32c2d33e | 13306 | BUILD_BUG_ON(__REQ_F_LAST_BIT > 8 * sizeof(int)); |
16340eab | 13307 | |
3a4b89a2 JA |
13308 | BUILD_BUG_ON(sizeof(atomic_t) != sizeof(u32)); |
13309 | ||
ee692a21 JA |
13310 | BUILD_BUG_ON(sizeof(struct io_uring_cmd) > 64); |
13311 | ||
91f245d5 JA |
13312 | req_cachep = KMEM_CACHE(io_kiocb, SLAB_HWCACHE_ALIGN | SLAB_PANIC | |
13313 | SLAB_ACCOUNT); | |
2b188cc1 JA |
13314 | return 0; |
13315 | }; | |
13316 | __initcall(io_uring_init); |