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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 */ |
042b0d85 | 98 | #define IORING_MAX_FIXED_FILES (1U << 15) |
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 | \ |
d5361233 | 115 | REQ_F_POLLED | REQ_F_CREDS | REQ_F_ASYNC_DATA) |
b16fed66 | 116 | |
a538be5b PB |
117 | #define IO_REQ_CLEAN_SLOW_FLAGS (REQ_F_REFCOUNT | REQ_F_LINK | REQ_F_HARDLINK |\ |
118 | IO_REQ_CLEAN_FLAGS) | |
119 | ||
09899b19 PB |
120 | #define IO_TCTX_REFS_CACHE_NR (1U << 10) |
121 | ||
2b188cc1 JA |
122 | struct io_uring { |
123 | u32 head ____cacheline_aligned_in_smp; | |
124 | u32 tail ____cacheline_aligned_in_smp; | |
125 | }; | |
126 | ||
1e84b97b | 127 | /* |
75b28aff HV |
128 | * This data is shared with the application through the mmap at offsets |
129 | * IORING_OFF_SQ_RING and IORING_OFF_CQ_RING. | |
1e84b97b SB |
130 | * |
131 | * The offsets to the member fields are published through struct | |
132 | * io_sqring_offsets when calling io_uring_setup. | |
133 | */ | |
75b28aff | 134 | struct io_rings { |
1e84b97b SB |
135 | /* |
136 | * Head and tail offsets into the ring; the offsets need to be | |
137 | * masked to get valid indices. | |
138 | * | |
75b28aff HV |
139 | * The kernel controls head of the sq ring and the tail of the cq ring, |
140 | * and the application controls tail of the sq ring and the head of the | |
141 | * cq ring. | |
1e84b97b | 142 | */ |
75b28aff | 143 | struct io_uring sq, cq; |
1e84b97b | 144 | /* |
75b28aff | 145 | * Bitmasks to apply to head and tail offsets (constant, equals |
1e84b97b SB |
146 | * ring_entries - 1) |
147 | */ | |
75b28aff HV |
148 | u32 sq_ring_mask, cq_ring_mask; |
149 | /* Ring sizes (constant, power of 2) */ | |
150 | u32 sq_ring_entries, cq_ring_entries; | |
1e84b97b SB |
151 | /* |
152 | * Number of invalid entries dropped by the kernel due to | |
153 | * invalid index stored in array | |
154 | * | |
155 | * Written by the kernel, shouldn't be modified by the | |
156 | * application (i.e. get number of "new events" by comparing to | |
157 | * cached value). | |
158 | * | |
159 | * After a new SQ head value was read by the application this | |
160 | * counter includes all submissions that were dropped reaching | |
161 | * the new SQ head (and possibly more). | |
162 | */ | |
75b28aff | 163 | u32 sq_dropped; |
1e84b97b | 164 | /* |
0d9b5b3a | 165 | * Runtime SQ flags |
1e84b97b SB |
166 | * |
167 | * Written by the kernel, shouldn't be modified by the | |
168 | * application. | |
169 | * | |
170 | * The application needs a full memory barrier before checking | |
171 | * for IORING_SQ_NEED_WAKEUP after updating the sq tail. | |
172 | */ | |
3a4b89a2 | 173 | atomic_t sq_flags; |
0d9b5b3a SG |
174 | /* |
175 | * Runtime CQ flags | |
176 | * | |
177 | * Written by the application, shouldn't be modified by the | |
178 | * kernel. | |
179 | */ | |
fe7e3257 | 180 | u32 cq_flags; |
1e84b97b SB |
181 | /* |
182 | * Number of completion events lost because the queue was full; | |
183 | * this should be avoided by the application by making sure | |
0b4295b5 | 184 | * there are not more requests pending than there is space in |
1e84b97b SB |
185 | * the completion queue. |
186 | * | |
187 | * Written by the kernel, shouldn't be modified by the | |
188 | * application (i.e. get number of "new events" by comparing to | |
189 | * cached value). | |
190 | * | |
191 | * As completion events come in out of order this counter is not | |
192 | * ordered with any other data. | |
193 | */ | |
75b28aff | 194 | u32 cq_overflow; |
1e84b97b SB |
195 | /* |
196 | * Ring buffer of completion events. | |
197 | * | |
198 | * The kernel writes completion events fresh every time they are | |
199 | * produced, so the application is allowed to modify pending | |
200 | * entries. | |
201 | */ | |
75b28aff | 202 | struct io_uring_cqe cqes[] ____cacheline_aligned_in_smp; |
2b188cc1 JA |
203 | }; |
204 | ||
edafccee JA |
205 | struct io_mapped_ubuf { |
206 | u64 ubuf; | |
4751f53d | 207 | u64 ubuf_end; |
edafccee | 208 | unsigned int nr_bvecs; |
de293938 | 209 | unsigned long acct_pages; |
41edf1a5 | 210 | struct bio_vec bvec[]; |
edafccee JA |
211 | }; |
212 | ||
50238531 BM |
213 | struct io_ring_ctx; |
214 | ||
6c2450ae | 215 | struct io_overflow_cqe { |
6c2450ae | 216 | struct list_head list; |
e45a3e05 | 217 | struct io_uring_cqe cqe; |
6c2450ae PB |
218 | }; |
219 | ||
5e45690a JA |
220 | /* |
221 | * FFS_SCM is only available on 64-bit archs, for 32-bit we just define it as 0 | |
222 | * and define IO_URING_SCM_ALL. For this case, we use SCM for all files as we | |
223 | * can't safely always dereference the file when the task has exited and ring | |
224 | * cleanup is done. If a file is tracked and part of SCM, then unix gc on | |
225 | * process exit may reap it before __io_sqe_files_unregister() is run. | |
226 | */ | |
227 | #define FFS_NOWAIT 0x1UL | |
228 | #define FFS_ISREG 0x2UL | |
229 | #if defined(CONFIG_64BIT) | |
230 | #define FFS_SCM 0x4UL | |
231 | #else | |
232 | #define IO_URING_SCM_ALL | |
233 | #define FFS_SCM 0x0UL | |
234 | #endif | |
235 | #define FFS_MASK ~(FFS_NOWAIT|FFS_ISREG|FFS_SCM) | |
236 | ||
a04b0ac0 PB |
237 | struct io_fixed_file { |
238 | /* file * with additional FFS_* flags */ | |
239 | unsigned long file_ptr; | |
240 | }; | |
241 | ||
269bbe5f BM |
242 | struct io_rsrc_put { |
243 | struct list_head list; | |
b60c8dce | 244 | u64 tag; |
50238531 BM |
245 | union { |
246 | void *rsrc; | |
247 | struct file *file; | |
bd54b6fe | 248 | struct io_mapped_ubuf *buf; |
50238531 | 249 | }; |
269bbe5f BM |
250 | }; |
251 | ||
aeca241b | 252 | struct io_file_table { |
042b0d85 | 253 | struct io_fixed_file *files; |
31b51510 JA |
254 | }; |
255 | ||
b895c9a6 | 256 | struct io_rsrc_node { |
05589553 XW |
257 | struct percpu_ref refs; |
258 | struct list_head node; | |
269bbe5f | 259 | struct list_head rsrc_list; |
b895c9a6 | 260 | struct io_rsrc_data *rsrc_data; |
4a38aed2 | 261 | struct llist_node llist; |
e297822b | 262 | bool done; |
05589553 XW |
263 | }; |
264 | ||
40ae0ff7 PB |
265 | typedef void (rsrc_put_fn)(struct io_ring_ctx *ctx, struct io_rsrc_put *prsrc); |
266 | ||
b895c9a6 | 267 | struct io_rsrc_data { |
05f3fb3c JA |
268 | struct io_ring_ctx *ctx; |
269 | ||
2d091d62 PB |
270 | u64 **tags; |
271 | unsigned int nr; | |
40ae0ff7 | 272 | rsrc_put_fn *do_put; |
3e942498 | 273 | atomic_t refs; |
05f3fb3c | 274 | struct completion done; |
8bad28d8 | 275 | bool quiesce; |
05f3fb3c JA |
276 | }; |
277 | ||
dbc7d452 | 278 | struct io_buffer_list { |
dbc7d452 JA |
279 | struct list_head buf_list; |
280 | __u16 bgid; | |
281 | }; | |
282 | ||
5a2e745d JA |
283 | struct io_buffer { |
284 | struct list_head list; | |
285 | __u64 addr; | |
d1f82808 | 286 | __u32 len; |
5a2e745d | 287 | __u16 bid; |
b1c62645 | 288 | __u16 bgid; |
5a2e745d JA |
289 | }; |
290 | ||
21b55dbc SG |
291 | struct io_restriction { |
292 | DECLARE_BITMAP(register_op, IORING_REGISTER_LAST); | |
293 | DECLARE_BITMAP(sqe_op, IORING_OP_LAST); | |
294 | u8 sqe_flags_allowed; | |
295 | u8 sqe_flags_required; | |
7e84e1c7 | 296 | bool registered; |
21b55dbc SG |
297 | }; |
298 | ||
37d1e2e3 JA |
299 | enum { |
300 | IO_SQ_THREAD_SHOULD_STOP = 0, | |
301 | IO_SQ_THREAD_SHOULD_PARK, | |
302 | }; | |
303 | ||
534ca6d6 JA |
304 | struct io_sq_data { |
305 | refcount_t refs; | |
9e138a48 | 306 | atomic_t park_pending; |
09a6f4ef | 307 | struct mutex lock; |
69fb2131 JA |
308 | |
309 | /* ctx's that are using this sqd */ | |
310 | struct list_head ctx_list; | |
69fb2131 | 311 | |
534ca6d6 JA |
312 | struct task_struct *thread; |
313 | struct wait_queue_head wait; | |
08369246 XW |
314 | |
315 | unsigned sq_thread_idle; | |
37d1e2e3 JA |
316 | int sq_cpu; |
317 | pid_t task_pid; | |
5c2469e0 | 318 | pid_t task_tgid; |
37d1e2e3 JA |
319 | |
320 | unsigned long state; | |
37d1e2e3 | 321 | struct completion exited; |
534ca6d6 JA |
322 | }; |
323 | ||
6dd0be1e | 324 | #define IO_COMPL_BATCH 32 |
6ff119a6 | 325 | #define IO_REQ_CACHE_SIZE 32 |
bf019da7 | 326 | #define IO_REQ_ALLOC_BATCH 8 |
258b29a9 | 327 | |
a1ab7b35 PB |
328 | struct io_submit_link { |
329 | struct io_kiocb *head; | |
330 | struct io_kiocb *last; | |
331 | }; | |
332 | ||
258b29a9 | 333 | struct io_submit_state { |
5a158c6b PB |
334 | /* inline/task_work completion list, under ->uring_lock */ |
335 | struct io_wq_work_node free_list; | |
336 | /* batch completion logic */ | |
337 | struct io_wq_work_list compl_reqs; | |
a1ab7b35 | 338 | struct io_submit_link link; |
258b29a9 | 339 | |
258b29a9 | 340 | bool plug_started; |
4b628aeb | 341 | bool need_plug; |
3d4aeb9f | 342 | bool flush_cqes; |
5ca7a8b3 | 343 | unsigned short submit_nr; |
5a158c6b | 344 | struct blk_plug plug; |
258b29a9 PB |
345 | }; |
346 | ||
77bc59b4 UA |
347 | struct io_ev_fd { |
348 | struct eventfd_ctx *cq_ev_fd; | |
c75312dd | 349 | unsigned int eventfd_async: 1; |
77bc59b4 UA |
350 | struct rcu_head rcu; |
351 | }; | |
352 | ||
9cfc7e94 | 353 | #define BGID_ARRAY 64 |
dbc7d452 | 354 | |
2b188cc1 | 355 | struct io_ring_ctx { |
b52ecf8c | 356 | /* const or read-mostly hot data */ |
2b188cc1 JA |
357 | struct { |
358 | struct percpu_ref refs; | |
2b188cc1 | 359 | |
b52ecf8c | 360 | struct io_rings *rings; |
2b188cc1 | 361 | unsigned int flags; |
9f010507 | 362 | enum task_work_notify_mode notify_method; |
e1d85334 | 363 | unsigned int compat: 1; |
e1d85334 | 364 | unsigned int drain_next: 1; |
21b55dbc | 365 | unsigned int restricted: 1; |
f18ee4cf | 366 | unsigned int off_timeout_used: 1; |
10c66904 | 367 | unsigned int drain_active: 1; |
5562a8d7 | 368 | unsigned int drain_disabled: 1; |
9aa8dfde | 369 | unsigned int has_evfd: 1; |
773697b6 | 370 | unsigned int syscall_iopoll: 1; |
b52ecf8c | 371 | } ____cacheline_aligned_in_smp; |
2b188cc1 | 372 | |
7f1129d2 | 373 | /* submission data */ |
b52ecf8c | 374 | struct { |
0499e582 PB |
375 | struct mutex uring_lock; |
376 | ||
75b28aff HV |
377 | /* |
378 | * Ring buffer of indices into array of io_uring_sqe, which is | |
379 | * mmapped by the application using the IORING_OFF_SQES offset. | |
380 | * | |
381 | * This indirection could e.g. be used to assign fixed | |
382 | * io_uring_sqe entries to operations and only submit them to | |
383 | * the queue when needed. | |
384 | * | |
385 | * The kernel modifies neither the indices array nor the entries | |
386 | * array. | |
387 | */ | |
388 | u32 *sq_array; | |
c7af47cf | 389 | struct io_uring_sqe *sq_sqes; |
2b188cc1 JA |
390 | unsigned cached_sq_head; |
391 | unsigned sq_entries; | |
de0617e4 | 392 | struct list_head defer_list; |
7f1129d2 PB |
393 | |
394 | /* | |
395 | * Fixed resources fast path, should be accessed only under | |
396 | * uring_lock, and updated through io_uring_register(2) | |
397 | */ | |
398 | struct io_rsrc_node *rsrc_node; | |
ab409402 | 399 | int rsrc_cached_refs; |
8e29da69 | 400 | atomic_t cancel_seq; |
7f1129d2 PB |
401 | struct io_file_table file_table; |
402 | unsigned nr_user_files; | |
403 | unsigned nr_user_bufs; | |
404 | struct io_mapped_ubuf **user_bufs; | |
405 | ||
406 | struct io_submit_state submit_state; | |
660cbfa2 | 407 | |
9cfc7e94 JA |
408 | struct io_buffer_list *io_bl; |
409 | struct xarray io_bl_xa; | |
cc3cec83 | 410 | struct list_head io_buffers_cache; |
660cbfa2 | 411 | |
5262f567 | 412 | struct list_head timeout_list; |
ef9dd637 | 413 | struct list_head ltimeout_list; |
1d7bb1d5 | 414 | struct list_head cq_overflow_list; |
4d9237e3 | 415 | struct list_head apoll_cache; |
7f1129d2 PB |
416 | struct xarray personalities; |
417 | u32 pers_next; | |
418 | unsigned sq_thread_idle; | |
2b188cc1 JA |
419 | } ____cacheline_aligned_in_smp; |
420 | ||
d0acdee2 | 421 | /* IRQ completion list, under ->completion_lock */ |
c2b6c6bc | 422 | struct io_wq_work_list locked_free_list; |
d0acdee2 | 423 | unsigned int locked_free_nr; |
3c1a2ead | 424 | |
7c30f36a | 425 | const struct cred *sq_creds; /* cred used for __io_sq_thread() */ |
534ca6d6 JA |
426 | struct io_sq_data *sq_data; /* if using sq thread polling */ |
427 | ||
90554200 | 428 | struct wait_queue_head sqo_sq_wait; |
69fb2131 | 429 | struct list_head sqd_list; |
75b28aff | 430 | |
10988a0a | 431 | unsigned long check_cq; |
5ed7a37d | 432 | |
206aefde | 433 | struct { |
d8da428b PB |
434 | /* |
435 | * We cache a range of free CQEs we can use, once exhausted it | |
436 | * should go through a slower range setup, see __io_get_cqe() | |
437 | */ | |
438 | struct io_uring_cqe *cqe_cached; | |
439 | struct io_uring_cqe *cqe_sentinel; | |
440 | ||
206aefde JA |
441 | unsigned cached_cq_tail; |
442 | unsigned cq_entries; | |
77bc59b4 | 443 | struct io_ev_fd __rcu *io_ev_fd; |
0499e582 PB |
444 | struct wait_queue_head cq_wait; |
445 | unsigned cq_extra; | |
446 | atomic_t cq_timeouts; | |
0499e582 | 447 | unsigned cq_last_tm_flush; |
206aefde | 448 | } ____cacheline_aligned_in_smp; |
2b188cc1 | 449 | |
2b188cc1 JA |
450 | struct { |
451 | spinlock_t completion_lock; | |
e94f141b | 452 | |
89850fce JA |
453 | spinlock_t timeout_lock; |
454 | ||
def596e9 | 455 | /* |
540e32a0 | 456 | * ->iopoll_list is protected by the ctx->uring_lock for |
def596e9 JA |
457 | * io_uring instances that don't use IORING_SETUP_SQPOLL. |
458 | * For SQPOLL, only the single threaded io_sq_thread() will | |
459 | * manipulate the list, hence no extra locking is needed there. | |
460 | */ | |
5eef4e87 | 461 | struct io_wq_work_list iopoll_list; |
78076bb6 JA |
462 | struct hlist_head *cancel_hash; |
463 | unsigned cancel_hash_bits; | |
915b3dde | 464 | bool poll_multi_queue; |
cc3cec83 JA |
465 | |
466 | struct list_head io_buffers_comp; | |
2b188cc1 | 467 | } ____cacheline_aligned_in_smp; |
85faa7b8 | 468 | |
21b55dbc | 469 | struct io_restriction restrictions; |
3c1a2ead | 470 | |
b13a8918 PB |
471 | /* slow path rsrc auxilary data, used by update/register */ |
472 | struct { | |
473 | struct io_rsrc_node *rsrc_backup_node; | |
474 | struct io_mapped_ubuf *dummy_ubuf; | |
475 | struct io_rsrc_data *file_data; | |
476 | struct io_rsrc_data *buf_data; | |
477 | ||
478 | struct delayed_work rsrc_put_work; | |
479 | struct llist_head rsrc_put_llist; | |
480 | struct list_head rsrc_ref_list; | |
481 | spinlock_t rsrc_ref_lock; | |
cc3cec83 JA |
482 | |
483 | struct list_head io_buffers_pages; | |
b13a8918 PB |
484 | }; |
485 | ||
3c1a2ead | 486 | /* Keep this last, we don't need it for the fast path */ |
b986af7e PB |
487 | struct { |
488 | #if defined(CONFIG_UNIX) | |
489 | struct socket *ring_sock; | |
490 | #endif | |
491 | /* hashed buffered write serialization */ | |
492 | struct io_wq_hash *hash_map; | |
493 | ||
494 | /* Only used for accounting purposes */ | |
495 | struct user_struct *user; | |
496 | struct mm_struct *mm_account; | |
497 | ||
498 | /* ctx exit and cancelation */ | |
9011bf9a PB |
499 | struct llist_head fallback_llist; |
500 | struct delayed_work fallback_work; | |
b986af7e PB |
501 | struct work_struct exit_work; |
502 | struct list_head tctx_list; | |
503 | struct completion ref_comp; | |
e139a1ec PB |
504 | u32 iowq_limits[2]; |
505 | bool iowq_limits_set; | |
b986af7e | 506 | }; |
2b188cc1 JA |
507 | }; |
508 | ||
e7a6c00d JA |
509 | /* |
510 | * Arbitrary limit, can be raised if need be | |
511 | */ | |
512 | #define IO_RINGFD_REG_MAX 16 | |
513 | ||
53e043b2 SM |
514 | struct io_uring_task { |
515 | /* submission side */ | |
09899b19 | 516 | int cached_refs; |
53e043b2 SM |
517 | struct xarray xa; |
518 | struct wait_queue_head wait; | |
ee53fb2b SM |
519 | const struct io_ring_ctx *last; |
520 | struct io_wq *io_wq; | |
53e043b2 SM |
521 | struct percpu_counter inflight; |
522 | atomic_t in_idle; | |
53e043b2 SM |
523 | |
524 | spinlock_t task_lock; | |
525 | struct io_wq_work_list task_list; | |
4813c377 | 526 | struct io_wq_work_list prior_task_list; |
53e043b2 | 527 | struct callback_head task_work; |
e7a6c00d | 528 | struct file **registered_rings; |
6294f368 | 529 | bool task_running; |
53e043b2 SM |
530 | }; |
531 | ||
09bb8394 JA |
532 | /* |
533 | * First field must be the file pointer in all the | |
534 | * iocb unions! See also 'struct kiocb' in <linux/fs.h> | |
535 | */ | |
221c5eb2 JA |
536 | struct io_poll_iocb { |
537 | struct file *file; | |
018043be | 538 | struct wait_queue_head *head; |
221c5eb2 | 539 | __poll_t events; |
392edb45 | 540 | struct wait_queue_entry wait; |
221c5eb2 JA |
541 | }; |
542 | ||
9d805892 | 543 | struct io_poll_update { |
018043be | 544 | struct file *file; |
9d805892 PB |
545 | u64 old_user_data; |
546 | u64 new_user_data; | |
547 | __poll_t events; | |
b69de288 JA |
548 | bool update_events; |
549 | bool update_user_data; | |
018043be PB |
550 | }; |
551 | ||
b5dba59e JA |
552 | struct io_close { |
553 | struct file *file; | |
b5dba59e | 554 | int fd; |
7df778be | 555 | u32 file_slot; |
b5dba59e JA |
556 | }; |
557 | ||
ad8a48ac JA |
558 | struct io_timeout_data { |
559 | struct io_kiocb *req; | |
560 | struct hrtimer timer; | |
561 | struct timespec64 ts; | |
562 | enum hrtimer_mode mode; | |
50c1df2b | 563 | u32 flags; |
ad8a48ac JA |
564 | }; |
565 | ||
8ed8d3c3 JA |
566 | struct io_accept { |
567 | struct file *file; | |
568 | struct sockaddr __user *addr; | |
569 | int __user *addr_len; | |
570 | int flags; | |
aaa4db12 | 571 | u32 file_slot; |
09952e3e | 572 | unsigned long nofile; |
8ed8d3c3 JA |
573 | }; |
574 | ||
1374e08e JA |
575 | struct io_socket { |
576 | struct file *file; | |
577 | int domain; | |
578 | int type; | |
579 | int protocol; | |
580 | int flags; | |
581 | u32 file_slot; | |
582 | unsigned long nofile; | |
583 | }; | |
584 | ||
8ed8d3c3 JA |
585 | struct io_sync { |
586 | struct file *file; | |
587 | loff_t len; | |
588 | loff_t off; | |
589 | int flags; | |
d63d1b5e | 590 | int mode; |
8ed8d3c3 JA |
591 | }; |
592 | ||
fbf23849 JA |
593 | struct io_cancel { |
594 | struct file *file; | |
595 | u64 addr; | |
8e29da69 | 596 | u32 flags; |
4bf94615 | 597 | s32 fd; |
fbf23849 JA |
598 | }; |
599 | ||
b29472ee JA |
600 | struct io_timeout { |
601 | struct file *file; | |
bfe68a22 PB |
602 | u32 off; |
603 | u32 target_seq; | |
135fcde8 | 604 | struct list_head list; |
90cd7e42 PB |
605 | /* head of the link, used by linked timeouts only */ |
606 | struct io_kiocb *head; | |
89b263f6 JA |
607 | /* for linked completions */ |
608 | struct io_kiocb *prev; | |
b29472ee JA |
609 | }; |
610 | ||
0bdf7a2d PB |
611 | struct io_timeout_rem { |
612 | struct file *file; | |
613 | u64 addr; | |
9c8e11b3 PB |
614 | |
615 | /* timeout update */ | |
616 | struct timespec64 ts; | |
617 | u32 flags; | |
f1042b6c | 618 | bool ltimeout; |
0bdf7a2d PB |
619 | }; |
620 | ||
9adbd45d JA |
621 | struct io_rw { |
622 | /* NOTE: kiocb has the file as the first member, so don't do it here */ | |
623 | struct kiocb kiocb; | |
624 | u64 addr; | |
584b0180 JA |
625 | u32 len; |
626 | u32 flags; | |
9adbd45d JA |
627 | }; |
628 | ||
3fbb51c1 JA |
629 | struct io_connect { |
630 | struct file *file; | |
631 | struct sockaddr __user *addr; | |
632 | int addr_len; | |
633 | }; | |
634 | ||
e47293fd JA |
635 | struct io_sr_msg { |
636 | struct file *file; | |
fddaface | 637 | union { |
4af3417a PB |
638 | struct compat_msghdr __user *umsg_compat; |
639 | struct user_msghdr __user *umsg; | |
640 | void __user *buf; | |
fddaface | 641 | }; |
e47293fd | 642 | int msg_flags; |
fddaface | 643 | size_t len; |
7ba89d2a | 644 | size_t done_io; |
0455d4cc | 645 | unsigned int flags; |
e47293fd JA |
646 | }; |
647 | ||
15b71abe JA |
648 | struct io_open { |
649 | struct file *file; | |
650 | int dfd; | |
b9445598 | 651 | u32 file_slot; |
15b71abe | 652 | struct filename *filename; |
c12cedf2 | 653 | struct open_how how; |
4022e7af | 654 | unsigned long nofile; |
15b71abe JA |
655 | }; |
656 | ||
269bbe5f | 657 | struct io_rsrc_update { |
05f3fb3c JA |
658 | struct file *file; |
659 | u64 arg; | |
660 | u32 nr_args; | |
661 | u32 offset; | |
662 | }; | |
663 | ||
4840e418 JA |
664 | struct io_fadvise { |
665 | struct file *file; | |
666 | u64 offset; | |
667 | u32 len; | |
668 | u32 advice; | |
669 | }; | |
670 | ||
c1ca757b JA |
671 | struct io_madvise { |
672 | struct file *file; | |
673 | u64 addr; | |
674 | u32 len; | |
675 | u32 advice; | |
676 | }; | |
677 | ||
3e4827b0 JA |
678 | struct io_epoll { |
679 | struct file *file; | |
680 | int epfd; | |
681 | int op; | |
682 | int fd; | |
683 | struct epoll_event event; | |
e47293fd JA |
684 | }; |
685 | ||
7d67af2c PB |
686 | struct io_splice { |
687 | struct file *file_out; | |
7d67af2c PB |
688 | loff_t off_out; |
689 | loff_t off_in; | |
690 | u64 len; | |
a3e4bc23 | 691 | int splice_fd_in; |
7d67af2c PB |
692 | unsigned int flags; |
693 | }; | |
694 | ||
ddf0322d JA |
695 | struct io_provide_buf { |
696 | struct file *file; | |
697 | __u64 addr; | |
38134ada | 698 | __u32 len; |
ddf0322d JA |
699 | __u32 bgid; |
700 | __u16 nbufs; | |
701 | __u16 bid; | |
702 | }; | |
703 | ||
1d9e1288 BM |
704 | struct io_statx { |
705 | struct file *file; | |
706 | int dfd; | |
707 | unsigned int mask; | |
708 | unsigned int flags; | |
1b6fe6e0 | 709 | struct filename *filename; |
1d9e1288 BM |
710 | struct statx __user *buffer; |
711 | }; | |
712 | ||
36f4fa68 JA |
713 | struct io_shutdown { |
714 | struct file *file; | |
715 | int how; | |
716 | }; | |
717 | ||
80a261fd JA |
718 | struct io_rename { |
719 | struct file *file; | |
720 | int old_dfd; | |
721 | int new_dfd; | |
722 | struct filename *oldpath; | |
723 | struct filename *newpath; | |
724 | int flags; | |
725 | }; | |
726 | ||
14a1143b JA |
727 | struct io_unlink { |
728 | struct file *file; | |
729 | int dfd; | |
730 | int flags; | |
731 | struct filename *filename; | |
732 | }; | |
733 | ||
e34a02dc DK |
734 | struct io_mkdir { |
735 | struct file *file; | |
736 | int dfd; | |
737 | umode_t mode; | |
738 | struct filename *filename; | |
739 | }; | |
740 | ||
7a8721f8 DK |
741 | struct io_symlink { |
742 | struct file *file; | |
743 | int new_dfd; | |
744 | struct filename *oldpath; | |
745 | struct filename *newpath; | |
746 | }; | |
747 | ||
cf30da90 DK |
748 | struct io_hardlink { |
749 | struct file *file; | |
750 | int old_dfd; | |
751 | int new_dfd; | |
752 | struct filename *oldpath; | |
753 | struct filename *newpath; | |
754 | int flags; | |
755 | }; | |
756 | ||
4f57f06c JA |
757 | struct io_msg { |
758 | struct file *file; | |
759 | u64 user_data; | |
760 | u32 len; | |
761 | }; | |
762 | ||
2bb04df7 SR |
763 | struct io_nop { |
764 | struct file *file; | |
765 | u64 extra1; | |
766 | u64 extra2; | |
767 | }; | |
768 | ||
f499a021 JA |
769 | struct io_async_connect { |
770 | struct sockaddr_storage address; | |
771 | }; | |
772 | ||
03b1230c JA |
773 | struct io_async_msghdr { |
774 | struct iovec fast_iov[UIO_FASTIOV]; | |
257e84a5 PB |
775 | /* points to an allocated iov, if NULL we use fast_iov instead */ |
776 | struct iovec *free_iov; | |
03b1230c JA |
777 | struct sockaddr __user *uaddr; |
778 | struct msghdr msg; | |
b537916c | 779 | struct sockaddr_storage addr; |
03b1230c JA |
780 | }; |
781 | ||
538941e2 | 782 | struct io_rw_state { |
ff6165b2 | 783 | struct iov_iter iter; |
cd658695 | 784 | struct iov_iter_state iter_state; |
c88598a9 | 785 | struct iovec fast_iov[UIO_FASTIOV]; |
538941e2 PB |
786 | }; |
787 | ||
788 | struct io_async_rw { | |
789 | struct io_rw_state s; | |
790 | const struct iovec *free_iovec; | |
227c0c96 | 791 | size_t bytes_done; |
bcf5a063 | 792 | struct wait_page_queue wpq; |
f67676d1 JA |
793 | }; |
794 | ||
e9621e2b SR |
795 | struct io_xattr { |
796 | struct file *file; | |
797 | struct xattr_ctx ctx; | |
798 | struct filename *filename; | |
799 | }; | |
800 | ||
6b47ee6e PB |
801 | enum { |
802 | REQ_F_FIXED_FILE_BIT = IOSQE_FIXED_FILE_BIT, | |
803 | REQ_F_IO_DRAIN_BIT = IOSQE_IO_DRAIN_BIT, | |
804 | REQ_F_LINK_BIT = IOSQE_IO_LINK_BIT, | |
805 | REQ_F_HARDLINK_BIT = IOSQE_IO_HARDLINK_BIT, | |
806 | REQ_F_FORCE_ASYNC_BIT = IOSQE_ASYNC_BIT, | |
bcda7baa | 807 | REQ_F_BUFFER_SELECT_BIT = IOSQE_BUFFER_SELECT_BIT, |
04c76b41 | 808 | REQ_F_CQE_SKIP_BIT = IOSQE_CQE_SKIP_SUCCESS_BIT, |
6b47ee6e | 809 | |
dddca226 | 810 | /* first byte is taken by user flags, shift it to not overlap */ |
93d2bcd2 | 811 | REQ_F_FAIL_BIT = 8, |
6b47ee6e PB |
812 | REQ_F_INFLIGHT_BIT, |
813 | REQ_F_CUR_POS_BIT, | |
814 | REQ_F_NOWAIT_BIT, | |
6b47ee6e | 815 | REQ_F_LINK_TIMEOUT_BIT, |
99bc4c38 | 816 | REQ_F_NEED_CLEANUP_BIT, |
d7718a9d | 817 | REQ_F_POLLED_BIT, |
bcda7baa | 818 | REQ_F_BUFFER_SELECTED_BIT, |
e342c807 | 819 | REQ_F_COMPLETE_INLINE_BIT, |
230d50d4 | 820 | REQ_F_REISSUE_BIT, |
b8e64b53 | 821 | REQ_F_CREDS_BIT, |
20e60a38 | 822 | REQ_F_REFCOUNT_BIT, |
4d13d1a4 | 823 | REQ_F_ARM_LTIMEOUT_BIT, |
d886e185 | 824 | REQ_F_ASYNC_DATA_BIT, |
04c76b41 | 825 | REQ_F_SKIP_LINK_CQES_BIT, |
91eac1c6 JA |
826 | REQ_F_SINGLE_POLL_BIT, |
827 | REQ_F_DOUBLE_POLL_BIT, | |
8a3e8ee5 | 828 | REQ_F_PARTIAL_IO_BIT, |
7b29f92d | 829 | /* keep async read/write and isreg together and in order */ |
35645ac3 | 830 | REQ_F_SUPPORT_NOWAIT_BIT, |
7b29f92d | 831 | REQ_F_ISREG_BIT, |
84557871 JA |
832 | |
833 | /* not a real bit, just to check we're not overflowing the space */ | |
834 | __REQ_F_LAST_BIT, | |
6b47ee6e PB |
835 | }; |
836 | ||
837 | enum { | |
838 | /* ctx owns file */ | |
839 | REQ_F_FIXED_FILE = BIT(REQ_F_FIXED_FILE_BIT), | |
840 | /* drain existing IO first */ | |
841 | REQ_F_IO_DRAIN = BIT(REQ_F_IO_DRAIN_BIT), | |
842 | /* linked sqes */ | |
843 | REQ_F_LINK = BIT(REQ_F_LINK_BIT), | |
844 | /* doesn't sever on completion < 0 */ | |
845 | REQ_F_HARDLINK = BIT(REQ_F_HARDLINK_BIT), | |
846 | /* IOSQE_ASYNC */ | |
847 | REQ_F_FORCE_ASYNC = BIT(REQ_F_FORCE_ASYNC_BIT), | |
bcda7baa JA |
848 | /* IOSQE_BUFFER_SELECT */ |
849 | REQ_F_BUFFER_SELECT = BIT(REQ_F_BUFFER_SELECT_BIT), | |
04c76b41 PB |
850 | /* IOSQE_CQE_SKIP_SUCCESS */ |
851 | REQ_F_CQE_SKIP = BIT(REQ_F_CQE_SKIP_BIT), | |
6b47ee6e | 852 | |
6b47ee6e | 853 | /* fail rest of links */ |
93d2bcd2 | 854 | REQ_F_FAIL = BIT(REQ_F_FAIL_BIT), |
b05a1bcd | 855 | /* on inflight list, should be cancelled and waited on exit reliably */ |
6b47ee6e PB |
856 | REQ_F_INFLIGHT = BIT(REQ_F_INFLIGHT_BIT), |
857 | /* read/write uses file position */ | |
858 | REQ_F_CUR_POS = BIT(REQ_F_CUR_POS_BIT), | |
859 | /* must not punt to workers */ | |
860 | REQ_F_NOWAIT = BIT(REQ_F_NOWAIT_BIT), | |
900fad45 | 861 | /* has or had linked timeout */ |
6b47ee6e | 862 | REQ_F_LINK_TIMEOUT = BIT(REQ_F_LINK_TIMEOUT_BIT), |
99bc4c38 PB |
863 | /* needs cleanup */ |
864 | REQ_F_NEED_CLEANUP = BIT(REQ_F_NEED_CLEANUP_BIT), | |
d7718a9d JA |
865 | /* already went through poll handler */ |
866 | REQ_F_POLLED = BIT(REQ_F_POLLED_BIT), | |
bcda7baa JA |
867 | /* buffer already selected */ |
868 | REQ_F_BUFFER_SELECTED = BIT(REQ_F_BUFFER_SELECTED_BIT), | |
e342c807 PB |
869 | /* completion is deferred through io_comp_state */ |
870 | REQ_F_COMPLETE_INLINE = BIT(REQ_F_COMPLETE_INLINE_BIT), | |
230d50d4 JA |
871 | /* caller should reissue async */ |
872 | REQ_F_REISSUE = BIT(REQ_F_REISSUE_BIT), | |
35645ac3 PB |
873 | /* supports async reads/writes */ |
874 | REQ_F_SUPPORT_NOWAIT = BIT(REQ_F_SUPPORT_NOWAIT_BIT), | |
7b29f92d JA |
875 | /* regular file */ |
876 | REQ_F_ISREG = BIT(REQ_F_ISREG_BIT), | |
b8e64b53 PB |
877 | /* has creds assigned */ |
878 | REQ_F_CREDS = BIT(REQ_F_CREDS_BIT), | |
20e60a38 PB |
879 | /* skip refcounting if not set */ |
880 | REQ_F_REFCOUNT = BIT(REQ_F_REFCOUNT_BIT), | |
4d13d1a4 PB |
881 | /* there is a linked timeout that has to be armed */ |
882 | REQ_F_ARM_LTIMEOUT = BIT(REQ_F_ARM_LTIMEOUT_BIT), | |
d886e185 PB |
883 | /* ->async_data allocated */ |
884 | REQ_F_ASYNC_DATA = BIT(REQ_F_ASYNC_DATA_BIT), | |
04c76b41 PB |
885 | /* don't post CQEs while failing linked requests */ |
886 | REQ_F_SKIP_LINK_CQES = BIT(REQ_F_SKIP_LINK_CQES_BIT), | |
91eac1c6 JA |
887 | /* single poll may be active */ |
888 | REQ_F_SINGLE_POLL = BIT(REQ_F_SINGLE_POLL_BIT), | |
889 | /* double poll may active */ | |
890 | REQ_F_DOUBLE_POLL = BIT(REQ_F_DOUBLE_POLL_BIT), | |
8a3e8ee5 JA |
891 | /* request has already done partial IO */ |
892 | REQ_F_PARTIAL_IO = BIT(REQ_F_PARTIAL_IO_BIT), | |
d7718a9d JA |
893 | }; |
894 | ||
895 | struct async_poll { | |
896 | struct io_poll_iocb poll; | |
807abcb0 | 897 | struct io_poll_iocb *double_poll; |
6b47ee6e PB |
898 | }; |
899 | ||
f237c30a | 900 | typedef void (*io_req_tw_func_t)(struct io_kiocb *req, bool *locked); |
5b0a6acc | 901 | |
7cbf1722 | 902 | struct io_task_work { |
5b0a6acc PB |
903 | union { |
904 | struct io_wq_work_node node; | |
905 | struct llist_node fallback_node; | |
906 | }; | |
907 | io_req_tw_func_t func; | |
7cbf1722 JA |
908 | }; |
909 | ||
992da01a PB |
910 | enum { |
911 | IORING_RSRC_FILE = 0, | |
912 | IORING_RSRC_BUFFER = 1, | |
913 | }; | |
914 | ||
cef216fc PB |
915 | struct io_cqe { |
916 | __u64 user_data; | |
917 | __s32 res; | |
918 | /* fd initially, then cflags for completion */ | |
919 | union { | |
920 | __u32 flags; | |
921 | int fd; | |
922 | }; | |
923 | }; | |
924 | ||
10988a0a DY |
925 | enum { |
926 | IO_CHECK_CQ_OVERFLOW_BIT, | |
155bc950 | 927 | IO_CHECK_CQ_DROPPED_BIT, |
10988a0a DY |
928 | }; |
929 | ||
09bb8394 JA |
930 | /* |
931 | * NOTE! Each of the iocb union members has the file pointer | |
932 | * as the first entry in their struct definition. So you can | |
933 | * access the file pointer through any of the sub-structs, | |
63c36549 | 934 | * or directly as just 'file' in this struct. |
09bb8394 | 935 | */ |
2b188cc1 | 936 | struct io_kiocb { |
221c5eb2 | 937 | union { |
09bb8394 | 938 | struct file *file; |
9adbd45d | 939 | struct io_rw rw; |
221c5eb2 | 940 | struct io_poll_iocb poll; |
9d805892 | 941 | struct io_poll_update poll_update; |
8ed8d3c3 JA |
942 | struct io_accept accept; |
943 | struct io_sync sync; | |
fbf23849 | 944 | struct io_cancel cancel; |
b29472ee | 945 | struct io_timeout timeout; |
0bdf7a2d | 946 | struct io_timeout_rem timeout_rem; |
3fbb51c1 | 947 | struct io_connect connect; |
e47293fd | 948 | struct io_sr_msg sr_msg; |
15b71abe | 949 | struct io_open open; |
b5dba59e | 950 | struct io_close close; |
269bbe5f | 951 | struct io_rsrc_update rsrc_update; |
4840e418 | 952 | struct io_fadvise fadvise; |
c1ca757b | 953 | struct io_madvise madvise; |
3e4827b0 | 954 | struct io_epoll epoll; |
7d67af2c | 955 | struct io_splice splice; |
ddf0322d | 956 | struct io_provide_buf pbuf; |
1d9e1288 | 957 | struct io_statx statx; |
36f4fa68 | 958 | struct io_shutdown shutdown; |
80a261fd | 959 | struct io_rename rename; |
14a1143b | 960 | struct io_unlink unlink; |
e34a02dc | 961 | struct io_mkdir mkdir; |
7a8721f8 | 962 | struct io_symlink symlink; |
cf30da90 | 963 | struct io_hardlink hardlink; |
4f57f06c | 964 | struct io_msg msg; |
e9621e2b | 965 | struct io_xattr xattr; |
1374e08e | 966 | struct io_socket sock; |
2bb04df7 | 967 | struct io_nop nop; |
ee692a21 | 968 | struct io_uring_cmd uring_cmd; |
221c5eb2 | 969 | }; |
2b188cc1 | 970 | |
d625c6ee | 971 | u8 opcode; |
65a6543d XW |
972 | /* polled IO has completed */ |
973 | u8 iopoll_completed; | |
1dbd023e JA |
974 | /* |
975 | * Can be either a fixed buffer index, or used with provided buffers. | |
976 | * For the latter, before issue it points to the buffer group ID, | |
977 | * and after selection it points to the buffer ID itself. | |
978 | */ | |
4f4eeba8 | 979 | u16 buf_index; |
d17e56eb PB |
980 | unsigned int flags; |
981 | ||
cef216fc | 982 | struct io_cqe cqe; |
4f4eeba8 | 983 | |
010e8e6b | 984 | struct io_ring_ctx *ctx; |
010e8e6b | 985 | struct task_struct *task; |
d7718a9d | 986 | |
c1bdf8ed | 987 | struct io_rsrc_node *rsrc_node; |
a4f8d94c JA |
988 | |
989 | union { | |
990 | /* store used ubuf, so we can prevent reloading */ | |
991 | struct io_mapped_ubuf *imu; | |
992 | ||
993 | /* stores selected buf, valid IFF REQ_F_BUFFER_SELECTED is set */ | |
994 | struct io_buffer *kbuf; | |
995 | }; | |
fcb323cc | 996 | |
2804ecd8 JA |
997 | union { |
998 | /* used by request caches, completion batching and iopoll */ | |
999 | struct io_wq_work_node comp_list; | |
1000 | /* cache ->apoll->events */ | |
1001 | int apoll_events; | |
1002 | }; | |
d17e56eb | 1003 | atomic_t refs; |
521d61fc | 1004 | atomic_t poll_refs; |
5b0a6acc | 1005 | struct io_task_work io_task_work; |
010e8e6b | 1006 | /* for polled requests, i.e. IORING_OP_POLL_ADD and async armed poll */ |
4e5bc0a9 SR |
1007 | union { |
1008 | struct hlist_node hash_node; | |
1009 | struct { | |
1010 | u64 extra1; | |
1011 | u64 extra2; | |
1012 | }; | |
1013 | }; | |
7e3709d5 | 1014 | /* internal polling, see IORING_FEAT_FAST_POLL */ |
010e8e6b | 1015 | struct async_poll *apoll; |
d886e185 PB |
1016 | /* opcode allocated if it needs to store data for async defer */ |
1017 | void *async_data; | |
41cdcc22 | 1018 | /* linked requests, IFF REQ_F_HARDLINK or REQ_F_LINK are set */ |
34d2bfe7 | 1019 | struct io_kiocb *link; |
41cdcc22 | 1020 | /* custom credentials, valid IFF REQ_F_CREDS is set */ |
521d61fc JA |
1021 | const struct cred *creds; |
1022 | struct io_wq_work work; | |
2b188cc1 | 1023 | }; |
05589553 | 1024 | |
13bf43f5 PB |
1025 | struct io_tctx_node { |
1026 | struct list_head ctx_node; | |
1027 | struct task_struct *task; | |
13bf43f5 PB |
1028 | struct io_ring_ctx *ctx; |
1029 | }; | |
1030 | ||
27dc8338 PB |
1031 | struct io_defer_entry { |
1032 | struct list_head list; | |
1033 | struct io_kiocb *req; | |
9cf7c104 | 1034 | u32 seq; |
2b188cc1 JA |
1035 | }; |
1036 | ||
b21432b4 JA |
1037 | struct io_cancel_data { |
1038 | struct io_ring_ctx *ctx; | |
4bf94615 JA |
1039 | union { |
1040 | u64 data; | |
1041 | struct file *file; | |
1042 | }; | |
8e29da69 JA |
1043 | u32 flags; |
1044 | int seq; | |
b21432b4 JA |
1045 | }; |
1046 | ||
ee692a21 JA |
1047 | /* |
1048 | * The URING_CMD payload starts at 'cmd' in the first sqe, and continues into | |
1049 | * the following sqe if SQE128 is used. | |
1050 | */ | |
1051 | #define uring_cmd_pdu_size(is_sqe128) \ | |
1052 | ((1 + !!(is_sqe128)) * sizeof(struct io_uring_sqe) - \ | |
1053 | offsetof(struct io_uring_sqe, cmd)) | |
1054 | ||
d3656344 | 1055 | struct io_op_def { |
d3656344 JA |
1056 | /* needs req->file assigned */ |
1057 | unsigned needs_file : 1; | |
6d63416d PB |
1058 | /* should block plug */ |
1059 | unsigned plug : 1; | |
d3656344 JA |
1060 | /* hash wq insertion if file is a regular file */ |
1061 | unsigned hash_reg_file : 1; | |
1062 | /* unbound wq insertion if file is a non-regular file */ | |
1063 | unsigned unbound_nonreg_file : 1; | |
8a72758c JA |
1064 | /* set if opcode supports polled "wait" */ |
1065 | unsigned pollin : 1; | |
1066 | unsigned pollout : 1; | |
52dd8640 | 1067 | unsigned poll_exclusive : 1; |
bcda7baa JA |
1068 | /* op supports buffer selection */ |
1069 | unsigned buffer_select : 1; | |
26f0505a PB |
1070 | /* do prep async if is going to be punted */ |
1071 | unsigned needs_async_setup : 1; | |
6d63416d PB |
1072 | /* opcode is not supported by this kernel */ |
1073 | unsigned not_supported : 1; | |
5bd2182d PM |
1074 | /* skip auditing */ |
1075 | unsigned audit_skip : 1; | |
73911426 JA |
1076 | /* supports ioprio */ |
1077 | unsigned ioprio : 1; | |
1078 | /* supports iopoll */ | |
1079 | unsigned iopoll : 1; | |
e8c2bc1f JA |
1080 | /* size of async data needed, if any */ |
1081 | unsigned short async_size; | |
d3656344 JA |
1082 | }; |
1083 | ||
0918682b | 1084 | static const struct io_op_def io_op_defs[] = { |
73911426 JA |
1085 | [IORING_OP_NOP] = { |
1086 | .audit_skip = 1, | |
1087 | .iopoll = 1, | |
1088 | }, | |
0463b6c5 | 1089 | [IORING_OP_READV] = { |
d3656344 JA |
1090 | .needs_file = 1, |
1091 | .unbound_nonreg_file = 1, | |
8a72758c | 1092 | .pollin = 1, |
4d954c25 | 1093 | .buffer_select = 1, |
26f0505a | 1094 | .needs_async_setup = 1, |
27926b68 | 1095 | .plug = 1, |
5bd2182d | 1096 | .audit_skip = 1, |
73911426 JA |
1097 | .ioprio = 1, |
1098 | .iopoll = 1, | |
e8c2bc1f | 1099 | .async_size = sizeof(struct io_async_rw), |
d3656344 | 1100 | }, |
0463b6c5 | 1101 | [IORING_OP_WRITEV] = { |
d3656344 JA |
1102 | .needs_file = 1, |
1103 | .hash_reg_file = 1, | |
1104 | .unbound_nonreg_file = 1, | |
8a72758c | 1105 | .pollout = 1, |
26f0505a | 1106 | .needs_async_setup = 1, |
27926b68 | 1107 | .plug = 1, |
5bd2182d | 1108 | .audit_skip = 1, |
73911426 JA |
1109 | .ioprio = 1, |
1110 | .iopoll = 1, | |
e8c2bc1f | 1111 | .async_size = sizeof(struct io_async_rw), |
d3656344 | 1112 | }, |
0463b6c5 | 1113 | [IORING_OP_FSYNC] = { |
d3656344 | 1114 | .needs_file = 1, |
5bd2182d | 1115 | .audit_skip = 1, |
d3656344 | 1116 | }, |
0463b6c5 | 1117 | [IORING_OP_READ_FIXED] = { |
d3656344 JA |
1118 | .needs_file = 1, |
1119 | .unbound_nonreg_file = 1, | |
8a72758c | 1120 | .pollin = 1, |
27926b68 | 1121 | .plug = 1, |
5bd2182d | 1122 | .audit_skip = 1, |
73911426 JA |
1123 | .ioprio = 1, |
1124 | .iopoll = 1, | |
e8c2bc1f | 1125 | .async_size = sizeof(struct io_async_rw), |
d3656344 | 1126 | }, |
0463b6c5 | 1127 | [IORING_OP_WRITE_FIXED] = { |
d3656344 JA |
1128 | .needs_file = 1, |
1129 | .hash_reg_file = 1, | |
1130 | .unbound_nonreg_file = 1, | |
8a72758c | 1131 | .pollout = 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_POLL_ADD] = { |
d3656344 JA |
1139 | .needs_file = 1, |
1140 | .unbound_nonreg_file = 1, | |
5bd2182d PM |
1141 | .audit_skip = 1, |
1142 | }, | |
1143 | [IORING_OP_POLL_REMOVE] = { | |
1144 | .audit_skip = 1, | |
d3656344 | 1145 | }, |
0463b6c5 | 1146 | [IORING_OP_SYNC_FILE_RANGE] = { |
d3656344 | 1147 | .needs_file = 1, |
5bd2182d | 1148 | .audit_skip = 1, |
d3656344 | 1149 | }, |
0463b6c5 | 1150 | [IORING_OP_SENDMSG] = { |
d3656344 JA |
1151 | .needs_file = 1, |
1152 | .unbound_nonreg_file = 1, | |
8a72758c | 1153 | .pollout = 1, |
26f0505a | 1154 | .needs_async_setup = 1, |
e8c2bc1f | 1155 | .async_size = sizeof(struct io_async_msghdr), |
d3656344 | 1156 | }, |
0463b6c5 | 1157 | [IORING_OP_RECVMSG] = { |
d3656344 JA |
1158 | .needs_file = 1, |
1159 | .unbound_nonreg_file = 1, | |
8a72758c | 1160 | .pollin = 1, |
52de1fe1 | 1161 | .buffer_select = 1, |
26f0505a | 1162 | .needs_async_setup = 1, |
e8c2bc1f | 1163 | .async_size = sizeof(struct io_async_msghdr), |
d3656344 | 1164 | }, |
0463b6c5 | 1165 | [IORING_OP_TIMEOUT] = { |
5bd2182d | 1166 | .audit_skip = 1, |
e8c2bc1f | 1167 | .async_size = sizeof(struct io_timeout_data), |
d3656344 | 1168 | }, |
9c8e11b3 PB |
1169 | [IORING_OP_TIMEOUT_REMOVE] = { |
1170 | /* used by timeout updates' prep() */ | |
5bd2182d | 1171 | .audit_skip = 1, |
9c8e11b3 | 1172 | }, |
0463b6c5 | 1173 | [IORING_OP_ACCEPT] = { |
d3656344 JA |
1174 | .needs_file = 1, |
1175 | .unbound_nonreg_file = 1, | |
8a72758c | 1176 | .pollin = 1, |
52dd8640 | 1177 | .poll_exclusive = 1, |
d3656344 | 1178 | }, |
5bd2182d PM |
1179 | [IORING_OP_ASYNC_CANCEL] = { |
1180 | .audit_skip = 1, | |
1181 | }, | |
0463b6c5 | 1182 | [IORING_OP_LINK_TIMEOUT] = { |
5bd2182d | 1183 | .audit_skip = 1, |
e8c2bc1f | 1184 | .async_size = sizeof(struct io_timeout_data), |
d3656344 | 1185 | }, |
0463b6c5 | 1186 | [IORING_OP_CONNECT] = { |
d3656344 JA |
1187 | .needs_file = 1, |
1188 | .unbound_nonreg_file = 1, | |
8a72758c | 1189 | .pollout = 1, |
26f0505a | 1190 | .needs_async_setup = 1, |
e8c2bc1f | 1191 | .async_size = sizeof(struct io_async_connect), |
d3656344 | 1192 | }, |
0463b6c5 | 1193 | [IORING_OP_FALLOCATE] = { |
d3656344 | 1194 | .needs_file = 1, |
d3656344 | 1195 | }, |
44526bed JA |
1196 | [IORING_OP_OPENAT] = {}, |
1197 | [IORING_OP_CLOSE] = {}, | |
5bd2182d PM |
1198 | [IORING_OP_FILES_UPDATE] = { |
1199 | .audit_skip = 1, | |
73911426 | 1200 | .iopoll = 1, |
5bd2182d PM |
1201 | }, |
1202 | [IORING_OP_STATX] = { | |
1203 | .audit_skip = 1, | |
1204 | }, | |
0463b6c5 | 1205 | [IORING_OP_READ] = { |
3a6820f2 JA |
1206 | .needs_file = 1, |
1207 | .unbound_nonreg_file = 1, | |
8a72758c | 1208 | .pollin = 1, |
bcda7baa | 1209 | .buffer_select = 1, |
27926b68 | 1210 | .plug = 1, |
5bd2182d | 1211 | .audit_skip = 1, |
73911426 JA |
1212 | .ioprio = 1, |
1213 | .iopoll = 1, | |
e8c2bc1f | 1214 | .async_size = sizeof(struct io_async_rw), |
3a6820f2 | 1215 | }, |
0463b6c5 | 1216 | [IORING_OP_WRITE] = { |
3a6820f2 | 1217 | .needs_file = 1, |
7b3188e7 | 1218 | .hash_reg_file = 1, |
3a6820f2 | 1219 | .unbound_nonreg_file = 1, |
8a72758c | 1220 | .pollout = 1, |
27926b68 | 1221 | .plug = 1, |
5bd2182d | 1222 | .audit_skip = 1, |
73911426 JA |
1223 | .ioprio = 1, |
1224 | .iopoll = 1, | |
e8c2bc1f | 1225 | .async_size = sizeof(struct io_async_rw), |
3a6820f2 | 1226 | }, |
0463b6c5 | 1227 | [IORING_OP_FADVISE] = { |
4840e418 | 1228 | .needs_file = 1, |
5bd2182d | 1229 | .audit_skip = 1, |
c1ca757b | 1230 | }, |
44526bed | 1231 | [IORING_OP_MADVISE] = {}, |
0463b6c5 | 1232 | [IORING_OP_SEND] = { |
fddaface JA |
1233 | .needs_file = 1, |
1234 | .unbound_nonreg_file = 1, | |
8a72758c | 1235 | .pollout = 1, |
5bd2182d | 1236 | .audit_skip = 1, |
fddaface | 1237 | }, |
0463b6c5 | 1238 | [IORING_OP_RECV] = { |
fddaface JA |
1239 | .needs_file = 1, |
1240 | .unbound_nonreg_file = 1, | |
8a72758c | 1241 | .pollin = 1, |
bcda7baa | 1242 | .buffer_select = 1, |
5bd2182d | 1243 | .audit_skip = 1, |
fddaface | 1244 | }, |
0463b6c5 | 1245 | [IORING_OP_OPENAT2] = { |
cebdb986 | 1246 | }, |
3e4827b0 JA |
1247 | [IORING_OP_EPOLL_CTL] = { |
1248 | .unbound_nonreg_file = 1, | |
5bd2182d | 1249 | .audit_skip = 1, |
3e4827b0 | 1250 | }, |
7d67af2c PB |
1251 | [IORING_OP_SPLICE] = { |
1252 | .needs_file = 1, | |
1253 | .hash_reg_file = 1, | |
1254 | .unbound_nonreg_file = 1, | |
5bd2182d PM |
1255 | .audit_skip = 1, |
1256 | }, | |
1257 | [IORING_OP_PROVIDE_BUFFERS] = { | |
1258 | .audit_skip = 1, | |
73911426 | 1259 | .iopoll = 1, |
5bd2182d PM |
1260 | }, |
1261 | [IORING_OP_REMOVE_BUFFERS] = { | |
1262 | .audit_skip = 1, | |
73911426 | 1263 | .iopoll = 1, |
ddf0322d | 1264 | }, |
f2a8d5c7 PB |
1265 | [IORING_OP_TEE] = { |
1266 | .needs_file = 1, | |
1267 | .hash_reg_file = 1, | |
1268 | .unbound_nonreg_file = 1, | |
5bd2182d | 1269 | .audit_skip = 1, |
f2a8d5c7 | 1270 | }, |
36f4fa68 JA |
1271 | [IORING_OP_SHUTDOWN] = { |
1272 | .needs_file = 1, | |
1273 | }, | |
44526bed JA |
1274 | [IORING_OP_RENAMEAT] = {}, |
1275 | [IORING_OP_UNLINKAT] = {}, | |
e34a02dc | 1276 | [IORING_OP_MKDIRAT] = {}, |
7a8721f8 | 1277 | [IORING_OP_SYMLINKAT] = {}, |
cf30da90 | 1278 | [IORING_OP_LINKAT] = {}, |
4f57f06c JA |
1279 | [IORING_OP_MSG_RING] = { |
1280 | .needs_file = 1, | |
73911426 | 1281 | .iopoll = 1, |
4f57f06c | 1282 | }, |
e9621e2b SR |
1283 | [IORING_OP_FSETXATTR] = { |
1284 | .needs_file = 1 | |
1285 | }, | |
1286 | [IORING_OP_SETXATTR] = {}, | |
a56834e0 SR |
1287 | [IORING_OP_FGETXATTR] = { |
1288 | .needs_file = 1 | |
1289 | }, | |
1290 | [IORING_OP_GETXATTR] = {}, | |
1374e08e JA |
1291 | [IORING_OP_SOCKET] = { |
1292 | .audit_skip = 1, | |
1293 | }, | |
ee692a21 JA |
1294 | [IORING_OP_URING_CMD] = { |
1295 | .needs_file = 1, | |
1296 | .plug = 1, | |
1297 | .needs_async_setup = 1, | |
1298 | .async_size = uring_cmd_pdu_size(1), | |
1299 | }, | |
d3656344 JA |
1300 | }; |
1301 | ||
0756a869 PB |
1302 | /* requests with any of those set should undergo io_disarm_next() */ |
1303 | #define IO_DISARM_MASK (REQ_F_ARM_LTIMEOUT | REQ_F_LINK_TIMEOUT | REQ_F_FAIL) | |
da1a08c5 | 1304 | #define IO_REQ_LINK_FLAGS (REQ_F_LINK | REQ_F_HARDLINK) |
0756a869 | 1305 | |
7a612350 | 1306 | static bool io_disarm_next(struct io_kiocb *req); |
eef51daa | 1307 | static void io_uring_del_tctx_node(unsigned long index); |
9936c7c2 PB |
1308 | static void io_uring_try_cancel_requests(struct io_ring_ctx *ctx, |
1309 | struct task_struct *task, | |
3dd0c97a | 1310 | bool cancel_all); |
78cc687b | 1311 | static void io_uring_cancel_generic(bool cancel_all, struct io_sq_data *sqd); |
1ffc5422 | 1312 | |
4e118cd9 | 1313 | static void __io_req_complete_post(struct io_kiocb *req, s32 res, u32 cflags); |
c7dae4ba | 1314 | static void io_dismantle_req(struct io_kiocb *req); |
94ae5e77 | 1315 | static void io_queue_linked_timeout(struct io_kiocb *req); |
fdecb662 | 1316 | static int __io_register_rsrc_update(struct io_ring_ctx *ctx, unsigned type, |
c3bdad02 | 1317 | struct io_uring_rsrc_update2 *up, |
98f0b3b4 | 1318 | unsigned nr_args); |
68fb8979 | 1319 | static void io_clean_op(struct io_kiocb *req); |
5106dd6e JA |
1320 | static inline struct file *io_file_get_fixed(struct io_kiocb *req, int fd, |
1321 | unsigned issue_flags); | |
1322 | static inline struct file *io_file_get_normal(struct io_kiocb *req, int fd); | |
d5361233 JA |
1323 | static void io_drop_inflight_file(struct io_kiocb *req); |
1324 | static bool io_assign_file(struct io_kiocb *req, unsigned int issue_flags); | |
cbc2e203 | 1325 | static void io_queue_sqe(struct io_kiocb *req); |
269bbe5f | 1326 | static void io_rsrc_put_work(struct work_struct *work); |
de0617e4 | 1327 | |
907d1df3 | 1328 | static void io_req_task_queue(struct io_kiocb *req); |
c450178d | 1329 | static void __io_submit_flush_completions(struct io_ring_ctx *ctx); |
179ae0d1 | 1330 | static int io_req_prep_async(struct io_kiocb *req); |
de0617e4 | 1331 | |
b9445598 PB |
1332 | static int io_install_fixed_file(struct io_kiocb *req, struct file *file, |
1333 | unsigned int issue_flags, u32 slot_index); | |
7df778be PB |
1334 | static int io_close_fixed(struct io_kiocb *req, unsigned int issue_flags); |
1335 | ||
f1042b6c | 1336 | static enum hrtimer_restart io_link_timeout_fn(struct hrtimer *timer); |
9aa8dfde | 1337 | static void io_eventfd_signal(struct io_ring_ctx *ctx); |
4e118cd9 | 1338 | static void io_req_tw_post_queue(struct io_kiocb *req, s32 res, u32 cflags); |
b9445598 | 1339 | |
2b188cc1 JA |
1340 | static struct kmem_cache *req_cachep; |
1341 | ||
0918682b | 1342 | static const struct file_operations io_uring_fops; |
2b188cc1 | 1343 | |
33337d03 DY |
1344 | const char *io_uring_get_opcode(u8 opcode) |
1345 | { | |
1346 | switch ((enum io_uring_op)opcode) { | |
1347 | case IORING_OP_NOP: | |
1348 | return "NOP"; | |
1349 | case IORING_OP_READV: | |
1350 | return "READV"; | |
1351 | case IORING_OP_WRITEV: | |
1352 | return "WRITEV"; | |
1353 | case IORING_OP_FSYNC: | |
1354 | return "FSYNC"; | |
1355 | case IORING_OP_READ_FIXED: | |
1356 | return "READ_FIXED"; | |
1357 | case IORING_OP_WRITE_FIXED: | |
1358 | return "WRITE_FIXED"; | |
1359 | case IORING_OP_POLL_ADD: | |
1360 | return "POLL_ADD"; | |
1361 | case IORING_OP_POLL_REMOVE: | |
1362 | return "POLL_REMOVE"; | |
1363 | case IORING_OP_SYNC_FILE_RANGE: | |
1364 | return "SYNC_FILE_RANGE"; | |
1365 | case IORING_OP_SENDMSG: | |
1366 | return "SENDMSG"; | |
1367 | case IORING_OP_RECVMSG: | |
1368 | return "RECVMSG"; | |
1369 | case IORING_OP_TIMEOUT: | |
1370 | return "TIMEOUT"; | |
1371 | case IORING_OP_TIMEOUT_REMOVE: | |
1372 | return "TIMEOUT_REMOVE"; | |
1373 | case IORING_OP_ACCEPT: | |
1374 | return "ACCEPT"; | |
1375 | case IORING_OP_ASYNC_CANCEL: | |
1376 | return "ASYNC_CANCEL"; | |
1377 | case IORING_OP_LINK_TIMEOUT: | |
1378 | return "LINK_TIMEOUT"; | |
1379 | case IORING_OP_CONNECT: | |
1380 | return "CONNECT"; | |
1381 | case IORING_OP_FALLOCATE: | |
1382 | return "FALLOCATE"; | |
1383 | case IORING_OP_OPENAT: | |
1384 | return "OPENAT"; | |
1385 | case IORING_OP_CLOSE: | |
1386 | return "CLOSE"; | |
1387 | case IORING_OP_FILES_UPDATE: | |
1388 | return "FILES_UPDATE"; | |
1389 | case IORING_OP_STATX: | |
1390 | return "STATX"; | |
1391 | case IORING_OP_READ: | |
1392 | return "READ"; | |
1393 | case IORING_OP_WRITE: | |
1394 | return "WRITE"; | |
1395 | case IORING_OP_FADVISE: | |
1396 | return "FADVISE"; | |
1397 | case IORING_OP_MADVISE: | |
1398 | return "MADVISE"; | |
1399 | case IORING_OP_SEND: | |
1400 | return "SEND"; | |
1401 | case IORING_OP_RECV: | |
1402 | return "RECV"; | |
1403 | case IORING_OP_OPENAT2: | |
1404 | return "OPENAT2"; | |
1405 | case IORING_OP_EPOLL_CTL: | |
1406 | return "EPOLL_CTL"; | |
1407 | case IORING_OP_SPLICE: | |
1408 | return "SPLICE"; | |
1409 | case IORING_OP_PROVIDE_BUFFERS: | |
1410 | return "PROVIDE_BUFFERS"; | |
1411 | case IORING_OP_REMOVE_BUFFERS: | |
1412 | return "REMOVE_BUFFERS"; | |
1413 | case IORING_OP_TEE: | |
1414 | return "TEE"; | |
1415 | case IORING_OP_SHUTDOWN: | |
1416 | return "SHUTDOWN"; | |
1417 | case IORING_OP_RENAMEAT: | |
1418 | return "RENAMEAT"; | |
1419 | case IORING_OP_UNLINKAT: | |
1420 | return "UNLINKAT"; | |
1421 | case IORING_OP_MKDIRAT: | |
1422 | return "MKDIRAT"; | |
1423 | case IORING_OP_SYMLINKAT: | |
1424 | return "SYMLINKAT"; | |
1425 | case IORING_OP_LINKAT: | |
1426 | return "LINKAT"; | |
1427 | case IORING_OP_MSG_RING: | |
1428 | return "MSG_RING"; | |
1429 | case IORING_OP_FSETXATTR: | |
1430 | return "FSETXATTR"; | |
1431 | case IORING_OP_SETXATTR: | |
1432 | return "SETXATTR"; | |
1433 | case IORING_OP_FGETXATTR: | |
1434 | return "FGETXATTR"; | |
1435 | case IORING_OP_GETXATTR: | |
1436 | return "GETXATTR"; | |
1437 | case IORING_OP_SOCKET: | |
1438 | return "SOCKET"; | |
ee692a21 JA |
1439 | case IORING_OP_URING_CMD: |
1440 | return "URING_CMD"; | |
33337d03 DY |
1441 | case IORING_OP_LAST: |
1442 | return "INVALID"; | |
1443 | } | |
1444 | return "INVALID"; | |
1445 | } | |
1446 | ||
2b188cc1 JA |
1447 | struct sock *io_uring_get_socket(struct file *file) |
1448 | { | |
1449 | #if defined(CONFIG_UNIX) | |
1450 | if (file->f_op == &io_uring_fops) { | |
1451 | struct io_ring_ctx *ctx = file->private_data; | |
1452 | ||
1453 | return ctx->ring_sock->sk; | |
1454 | } | |
1455 | #endif | |
1456 | return NULL; | |
1457 | } | |
1458 | EXPORT_SYMBOL(io_uring_get_socket); | |
1459 | ||
1f59bc0f PB |
1460 | #if defined(CONFIG_UNIX) |
1461 | static inline bool io_file_need_scm(struct file *filp) | |
1462 | { | |
5e45690a JA |
1463 | #if defined(IO_URING_SCM_ALL) |
1464 | return true; | |
1465 | #else | |
1f59bc0f | 1466 | return !!unix_get_socket(filp); |
5e45690a | 1467 | #endif |
1f59bc0f PB |
1468 | } |
1469 | #else | |
1470 | static inline bool io_file_need_scm(struct file *filp) | |
1471 | { | |
5e45690a | 1472 | return false; |
1f59bc0f PB |
1473 | } |
1474 | #endif | |
1475 | ||
f8929630 PB |
1476 | static void io_ring_submit_unlock(struct io_ring_ctx *ctx, unsigned issue_flags) |
1477 | { | |
1478 | lockdep_assert_held(&ctx->uring_lock); | |
1479 | if (issue_flags & IO_URING_F_UNLOCKED) | |
1480 | mutex_unlock(&ctx->uring_lock); | |
1481 | } | |
1482 | ||
1483 | static void io_ring_submit_lock(struct io_ring_ctx *ctx, unsigned issue_flags) | |
1484 | { | |
1485 | /* | |
1486 | * "Normal" inline submissions always hold the uring_lock, since we | |
1487 | * grab it from the system call. Same is true for the SQPOLL offload. | |
1488 | * The only exception is when we've detached the request and issue it | |
1489 | * from an async worker thread, grab the lock for that case. | |
1490 | */ | |
1491 | if (issue_flags & IO_URING_F_UNLOCKED) | |
1492 | mutex_lock(&ctx->uring_lock); | |
1493 | lockdep_assert_held(&ctx->uring_lock); | |
1494 | } | |
1495 | ||
f237c30a PB |
1496 | static inline void io_tw_lock(struct io_ring_ctx *ctx, bool *locked) |
1497 | { | |
1498 | if (!*locked) { | |
1499 | mutex_lock(&ctx->uring_lock); | |
1500 | *locked = true; | |
1501 | } | |
1502 | } | |
1503 | ||
f2f87370 PB |
1504 | #define io_for_each_link(pos, head) \ |
1505 | for (pos = (head); pos; pos = pos->link) | |
1506 | ||
21c843d5 PB |
1507 | /* |
1508 | * Shamelessly stolen from the mm implementation of page reference checking, | |
1509 | * see commit f958d7b528b1 for details. | |
1510 | */ | |
1511 | #define req_ref_zero_or_close_to_overflow(req) \ | |
1512 | ((unsigned int) atomic_read(&(req->refs)) + 127u <= 127u) | |
1513 | ||
1514 | static inline bool req_ref_inc_not_zero(struct io_kiocb *req) | |
1515 | { | |
20e60a38 | 1516 | WARN_ON_ONCE(!(req->flags & REQ_F_REFCOUNT)); |
21c843d5 PB |
1517 | return atomic_inc_not_zero(&req->refs); |
1518 | } | |
1519 | ||
21c843d5 PB |
1520 | static inline bool req_ref_put_and_test(struct io_kiocb *req) |
1521 | { | |
20e60a38 PB |
1522 | if (likely(!(req->flags & REQ_F_REFCOUNT))) |
1523 | return true; | |
1524 | ||
21c843d5 PB |
1525 | WARN_ON_ONCE(req_ref_zero_or_close_to_overflow(req)); |
1526 | return atomic_dec_and_test(&req->refs); | |
1527 | } | |
1528 | ||
21c843d5 PB |
1529 | static inline void req_ref_get(struct io_kiocb *req) |
1530 | { | |
20e60a38 | 1531 | WARN_ON_ONCE(!(req->flags & REQ_F_REFCOUNT)); |
21c843d5 PB |
1532 | WARN_ON_ONCE(req_ref_zero_or_close_to_overflow(req)); |
1533 | atomic_inc(&req->refs); | |
1534 | } | |
1535 | ||
c450178d PB |
1536 | static inline void io_submit_flush_completions(struct io_ring_ctx *ctx) |
1537 | { | |
6f33b0bc | 1538 | if (!wq_list_empty(&ctx->submit_state.compl_reqs)) |
c450178d PB |
1539 | __io_submit_flush_completions(ctx); |
1540 | } | |
1541 | ||
48dcd38d | 1542 | static inline void __io_req_set_refcount(struct io_kiocb *req, int nr) |
20e60a38 PB |
1543 | { |
1544 | if (!(req->flags & REQ_F_REFCOUNT)) { | |
1545 | req->flags |= REQ_F_REFCOUNT; | |
48dcd38d | 1546 | atomic_set(&req->refs, nr); |
20e60a38 PB |
1547 | } |
1548 | } | |
1549 | ||
48dcd38d PB |
1550 | static inline void io_req_set_refcount(struct io_kiocb *req) |
1551 | { | |
1552 | __io_req_set_refcount(req, 1); | |
1553 | } | |
1554 | ||
ab409402 PB |
1555 | #define IO_RSRC_REF_BATCH 100 |
1556 | ||
25a15d3c PB |
1557 | static void io_rsrc_put_node(struct io_rsrc_node *node, int nr) |
1558 | { | |
1559 | percpu_ref_put_many(&node->refs, nr); | |
1560 | } | |
1561 | ||
ab409402 PB |
1562 | static inline void io_req_put_rsrc_locked(struct io_kiocb *req, |
1563 | struct io_ring_ctx *ctx) | |
1564 | __must_hold(&ctx->uring_lock) | |
36f72fe2 | 1565 | { |
c1bdf8ed | 1566 | struct io_rsrc_node *node = req->rsrc_node; |
ab409402 | 1567 | |
c1bdf8ed PB |
1568 | if (node) { |
1569 | if (node == ctx->rsrc_node) | |
ab409402 PB |
1570 | ctx->rsrc_cached_refs++; |
1571 | else | |
25a15d3c | 1572 | io_rsrc_put_node(node, 1); |
ab409402 PB |
1573 | } |
1574 | } | |
1575 | ||
7ac1edc4 | 1576 | static inline void io_req_put_rsrc(struct io_kiocb *req) |
ab409402 | 1577 | { |
c1bdf8ed | 1578 | if (req->rsrc_node) |
25a15d3c | 1579 | io_rsrc_put_node(req->rsrc_node, 1); |
ab409402 PB |
1580 | } |
1581 | ||
1582 | static __cold void io_rsrc_refs_drop(struct io_ring_ctx *ctx) | |
1583 | __must_hold(&ctx->uring_lock) | |
1584 | { | |
1585 | if (ctx->rsrc_cached_refs) { | |
25a15d3c | 1586 | io_rsrc_put_node(ctx->rsrc_node, ctx->rsrc_cached_refs); |
ab409402 PB |
1587 | ctx->rsrc_cached_refs = 0; |
1588 | } | |
1589 | } | |
1590 | ||
1591 | static void io_rsrc_refs_refill(struct io_ring_ctx *ctx) | |
1592 | __must_hold(&ctx->uring_lock) | |
1593 | { | |
1594 | ctx->rsrc_cached_refs += IO_RSRC_REF_BATCH; | |
1595 | percpu_ref_get_many(&ctx->rsrc_node->refs, IO_RSRC_REF_BATCH); | |
1596 | } | |
36f72fe2 | 1597 | |
a46be971 | 1598 | static inline void io_req_set_rsrc_node(struct io_kiocb *req, |
5106dd6e JA |
1599 | struct io_ring_ctx *ctx, |
1600 | unsigned int issue_flags) | |
36f72fe2 | 1601 | { |
c1bdf8ed PB |
1602 | if (!req->rsrc_node) { |
1603 | req->rsrc_node = ctx->rsrc_node; | |
5106dd6e JA |
1604 | |
1605 | if (!(issue_flags & IO_URING_F_UNLOCKED)) { | |
1606 | lockdep_assert_held(&ctx->uring_lock); | |
1607 | ctx->rsrc_cached_refs--; | |
1608 | if (unlikely(ctx->rsrc_cached_refs < 0)) | |
1609 | io_rsrc_refs_refill(ctx); | |
1610 | } else { | |
c1bdf8ed | 1611 | percpu_ref_get(&req->rsrc_node->refs); |
5106dd6e | 1612 | } |
36f72fe2 PB |
1613 | } |
1614 | } | |
1615 | ||
cc3cec83 | 1616 | static unsigned int __io_put_kbuf(struct io_kiocb *req, struct list_head *list) |
3648e526 | 1617 | { |
3648e526 | 1618 | req->flags &= ~REQ_F_BUFFER_SELECTED; |
1dbd023e | 1619 | list_add(&req->kbuf->list, list); |
1dbd023e JA |
1620 | |
1621 | return IORING_CQE_F_BUFFER | (req->buf_index << IORING_CQE_BUFFER_SHIFT); | |
3648e526 HX |
1622 | } |
1623 | ||
cc3cec83 | 1624 | static inline unsigned int io_put_kbuf_comp(struct io_kiocb *req) |
3648e526 | 1625 | { |
8197b053 PB |
1626 | lockdep_assert_held(&req->ctx->completion_lock); |
1627 | ||
3648e526 HX |
1628 | if (likely(!(req->flags & REQ_F_BUFFER_SELECTED))) |
1629 | return 0; | |
cc3cec83 JA |
1630 | return __io_put_kbuf(req, &req->ctx->io_buffers_comp); |
1631 | } | |
1632 | ||
1633 | static inline unsigned int io_put_kbuf(struct io_kiocb *req, | |
1634 | unsigned issue_flags) | |
1635 | { | |
1636 | unsigned int cflags; | |
1637 | ||
1638 | if (likely(!(req->flags & REQ_F_BUFFER_SELECTED))) | |
1639 | return 0; | |
1640 | ||
1641 | /* | |
1642 | * We can add this buffer back to two lists: | |
1643 | * | |
1644 | * 1) The io_buffers_cache list. This one is protected by the | |
1645 | * ctx->uring_lock. If we already hold this lock, add back to this | |
1646 | * list as we can grab it from issue as well. | |
1647 | * 2) The io_buffers_comp list. This one is protected by the | |
1648 | * ctx->completion_lock. | |
1649 | * | |
1650 | * We migrate buffers from the comp_list to the issue cache list | |
1651 | * when we need one. | |
1652 | */ | |
1653 | if (issue_flags & IO_URING_F_UNLOCKED) { | |
1654 | struct io_ring_ctx *ctx = req->ctx; | |
1655 | ||
1656 | spin_lock(&ctx->completion_lock); | |
1657 | cflags = __io_put_kbuf(req, &ctx->io_buffers_comp); | |
1658 | spin_unlock(&ctx->completion_lock); | |
1659 | } else { | |
ab0ac095 PB |
1660 | lockdep_assert_held(&req->ctx->uring_lock); |
1661 | ||
cc3cec83 JA |
1662 | cflags = __io_put_kbuf(req, &req->ctx->io_buffers_cache); |
1663 | } | |
1664 | ||
1665 | return cflags; | |
3648e526 HX |
1666 | } |
1667 | ||
dbc7d452 JA |
1668 | static struct io_buffer_list *io_buffer_get_list(struct io_ring_ctx *ctx, |
1669 | unsigned int bgid) | |
1670 | { | |
9cfc7e94 JA |
1671 | if (ctx->io_bl && bgid < BGID_ARRAY) |
1672 | return &ctx->io_bl[bgid]; | |
dbc7d452 | 1673 | |
9cfc7e94 | 1674 | return xa_load(&ctx->io_bl_xa, bgid); |
dbc7d452 JA |
1675 | } |
1676 | ||
4d55f238 | 1677 | static void io_kbuf_recycle(struct io_kiocb *req, unsigned issue_flags) |
b1c62645 JA |
1678 | { |
1679 | struct io_ring_ctx *ctx = req->ctx; | |
dbc7d452 JA |
1680 | struct io_buffer_list *bl; |
1681 | struct io_buffer *buf; | |
b1c62645 JA |
1682 | |
1683 | if (likely(!(req->flags & REQ_F_BUFFER_SELECTED))) | |
1684 | return; | |
8a3e8ee5 JA |
1685 | /* don't recycle if we already did IO to this buffer */ |
1686 | if (req->flags & REQ_F_PARTIAL_IO) | |
1687 | return; | |
b1c62645 | 1688 | |
f8929630 | 1689 | io_ring_submit_lock(ctx, issue_flags); |
b1c62645 JA |
1690 | |
1691 | buf = req->kbuf; | |
dbc7d452 JA |
1692 | bl = io_buffer_get_list(ctx, buf->bgid); |
1693 | list_add(&buf->list, &bl->buf_list); | |
b1c62645 | 1694 | req->flags &= ~REQ_F_BUFFER_SELECTED; |
1dbd023e | 1695 | req->buf_index = buf->bgid; |
4d55f238 | 1696 | |
f8929630 | 1697 | io_ring_submit_unlock(ctx, issue_flags); |
b1c62645 JA |
1698 | } |
1699 | ||
3dd0c97a PB |
1700 | static bool io_match_task(struct io_kiocb *head, struct task_struct *task, |
1701 | bool cancel_all) | |
6af3f48b | 1702 | __must_hold(&req->ctx->timeout_lock) |
08d23634 | 1703 | { |
68207680 | 1704 | if (task && head->task != task) |
08d23634 | 1705 | return false; |
d5361233 | 1706 | return cancel_all; |
6af3f48b PB |
1707 | } |
1708 | ||
1709 | /* | |
1710 | * As io_match_task() but protected against racing with linked timeouts. | |
1711 | * User must not hold timeout_lock. | |
1712 | */ | |
1713 | static bool io_match_task_safe(struct io_kiocb *head, struct task_struct *task, | |
1714 | bool cancel_all) | |
1715 | { | |
6af3f48b PB |
1716 | if (task && head->task != task) |
1717 | return false; | |
d5361233 | 1718 | return cancel_all; |
6af3f48b PB |
1719 | } |
1720 | ||
d886e185 PB |
1721 | static inline bool req_has_async_data(struct io_kiocb *req) |
1722 | { | |
1723 | return req->flags & REQ_F_ASYNC_DATA; | |
1724 | } | |
1725 | ||
93d2bcd2 | 1726 | static inline void req_set_fail(struct io_kiocb *req) |
c40f6379 | 1727 | { |
93d2bcd2 | 1728 | req->flags |= REQ_F_FAIL; |
04c76b41 PB |
1729 | if (req->flags & REQ_F_CQE_SKIP) { |
1730 | req->flags &= ~REQ_F_CQE_SKIP; | |
1731 | req->flags |= REQ_F_SKIP_LINK_CQES; | |
1732 | } | |
c40f6379 | 1733 | } |
4a38aed2 | 1734 | |
a8295b98 HX |
1735 | static inline void req_fail_link_node(struct io_kiocb *req, int res) |
1736 | { | |
1737 | req_set_fail(req); | |
cef216fc | 1738 | req->cqe.res = res; |
a8295b98 HX |
1739 | } |
1740 | ||
fa05457a PB |
1741 | static inline void io_req_add_to_cache(struct io_kiocb *req, struct io_ring_ctx *ctx) |
1742 | { | |
1743 | wq_stack_add_head(&req->comp_list, &ctx->submit_state.free_list); | |
a8295b98 HX |
1744 | } |
1745 | ||
c072481d | 1746 | static __cold void io_ring_ctx_ref_free(struct percpu_ref *ref) |
2b188cc1 JA |
1747 | { |
1748 | struct io_ring_ctx *ctx = container_of(ref, struct io_ring_ctx, refs); | |
1749 | ||
0f158b4c | 1750 | complete(&ctx->ref_comp); |
2b188cc1 JA |
1751 | } |
1752 | ||
8eb7e2d0 PB |
1753 | static inline bool io_is_timeout_noseq(struct io_kiocb *req) |
1754 | { | |
1755 | return !req->timeout.off; | |
1756 | } | |
1757 | ||
c072481d | 1758 | static __cold void io_fallback_req_func(struct work_struct *work) |
f56165e6 PB |
1759 | { |
1760 | struct io_ring_ctx *ctx = container_of(work, struct io_ring_ctx, | |
1761 | fallback_work.work); | |
1762 | struct llist_node *node = llist_del_all(&ctx->fallback_llist); | |
1763 | struct io_kiocb *req, *tmp; | |
f237c30a | 1764 | bool locked = false; |
f56165e6 PB |
1765 | |
1766 | percpu_ref_get(&ctx->refs); | |
1767 | llist_for_each_entry_safe(req, tmp, node, io_task_work.fallback_node) | |
f237c30a | 1768 | req->io_task_work.func(req, &locked); |
5636c00d | 1769 | |
f237c30a | 1770 | if (locked) { |
c450178d | 1771 | io_submit_flush_completions(ctx); |
f237c30a PB |
1772 | mutex_unlock(&ctx->uring_lock); |
1773 | } | |
f56165e6 PB |
1774 | percpu_ref_put(&ctx->refs); |
1775 | } | |
1776 | ||
c072481d | 1777 | static __cold struct io_ring_ctx *io_ring_ctx_alloc(struct io_uring_params *p) |
2b188cc1 JA |
1778 | { |
1779 | struct io_ring_ctx *ctx; | |
9cfc7e94 | 1780 | int hash_bits; |
2b188cc1 JA |
1781 | |
1782 | ctx = kzalloc(sizeof(*ctx), GFP_KERNEL); | |
1783 | if (!ctx) | |
1784 | return NULL; | |
1785 | ||
9cfc7e94 JA |
1786 | xa_init(&ctx->io_bl_xa); |
1787 | ||
78076bb6 JA |
1788 | /* |
1789 | * Use 5 bits less than the max cq entries, that should give us around | |
1790 | * 32 entries per hash list if totally full and uniformly spread. | |
1791 | */ | |
1792 | hash_bits = ilog2(p->cq_entries); | |
1793 | hash_bits -= 5; | |
1794 | if (hash_bits <= 0) | |
1795 | hash_bits = 1; | |
1796 | ctx->cancel_hash_bits = hash_bits; | |
1797 | ctx->cancel_hash = kmalloc((1U << hash_bits) * sizeof(struct hlist_head), | |
1798 | GFP_KERNEL); | |
1799 | if (!ctx->cancel_hash) | |
1800 | goto err; | |
1801 | __hash_init(ctx->cancel_hash, 1U << hash_bits); | |
1802 | ||
6224843d PB |
1803 | ctx->dummy_ubuf = kzalloc(sizeof(*ctx->dummy_ubuf), GFP_KERNEL); |
1804 | if (!ctx->dummy_ubuf) | |
1805 | goto err; | |
1806 | /* set invalid range, so io_import_fixed() fails meeting it */ | |
1807 | ctx->dummy_ubuf->ubuf = -1UL; | |
1808 | ||
21482896 | 1809 | if (percpu_ref_init(&ctx->refs, io_ring_ctx_ref_free, |
206aefde JA |
1810 | PERCPU_REF_ALLOW_REINIT, GFP_KERNEL)) |
1811 | goto err; | |
2b188cc1 JA |
1812 | |
1813 | ctx->flags = p->flags; | |
90554200 | 1814 | init_waitqueue_head(&ctx->sqo_sq_wait); |
69fb2131 | 1815 | INIT_LIST_HEAD(&ctx->sqd_list); |
1d7bb1d5 | 1816 | INIT_LIST_HEAD(&ctx->cq_overflow_list); |
cc3cec83 | 1817 | INIT_LIST_HEAD(&ctx->io_buffers_cache); |
4d9237e3 | 1818 | INIT_LIST_HEAD(&ctx->apoll_cache); |
0f158b4c | 1819 | init_completion(&ctx->ref_comp); |
61cf9370 | 1820 | xa_init_flags(&ctx->personalities, XA_FLAGS_ALLOC1); |
2b188cc1 | 1821 | mutex_init(&ctx->uring_lock); |
311997b3 | 1822 | init_waitqueue_head(&ctx->cq_wait); |
2b188cc1 | 1823 | spin_lock_init(&ctx->completion_lock); |
89850fce | 1824 | spin_lock_init(&ctx->timeout_lock); |
5eef4e87 | 1825 | INIT_WQ_LIST(&ctx->iopoll_list); |
cc3cec83 JA |
1826 | INIT_LIST_HEAD(&ctx->io_buffers_pages); |
1827 | INIT_LIST_HEAD(&ctx->io_buffers_comp); | |
de0617e4 | 1828 | INIT_LIST_HEAD(&ctx->defer_list); |
5262f567 | 1829 | INIT_LIST_HEAD(&ctx->timeout_list); |
ef9dd637 | 1830 | INIT_LIST_HEAD(&ctx->ltimeout_list); |
d67d2263 BM |
1831 | spin_lock_init(&ctx->rsrc_ref_lock); |
1832 | INIT_LIST_HEAD(&ctx->rsrc_ref_list); | |
269bbe5f BM |
1833 | INIT_DELAYED_WORK(&ctx->rsrc_put_work, io_rsrc_put_work); |
1834 | init_llist_head(&ctx->rsrc_put_llist); | |
13bf43f5 | 1835 | INIT_LIST_HEAD(&ctx->tctx_list); |
c2b6c6bc PB |
1836 | ctx->submit_state.free_list.next = NULL; |
1837 | INIT_WQ_LIST(&ctx->locked_free_list); | |
9011bf9a | 1838 | INIT_DELAYED_WORK(&ctx->fallback_work, io_fallback_req_func); |
6f33b0bc | 1839 | INIT_WQ_LIST(&ctx->submit_state.compl_reqs); |
2b188cc1 | 1840 | return ctx; |
206aefde | 1841 | err: |
6224843d | 1842 | kfree(ctx->dummy_ubuf); |
78076bb6 | 1843 | kfree(ctx->cancel_hash); |
9cfc7e94 JA |
1844 | kfree(ctx->io_bl); |
1845 | xa_destroy(&ctx->io_bl_xa); | |
206aefde JA |
1846 | kfree(ctx); |
1847 | return NULL; | |
2b188cc1 JA |
1848 | } |
1849 | ||
8f6ed49a PB |
1850 | static void io_account_cq_overflow(struct io_ring_ctx *ctx) |
1851 | { | |
1852 | struct io_rings *r = ctx->rings; | |
1853 | ||
1854 | WRITE_ONCE(r->cq_overflow, READ_ONCE(r->cq_overflow) + 1); | |
1855 | ctx->cq_extra--; | |
1856 | } | |
1857 | ||
9cf7c104 | 1858 | static bool req_need_defer(struct io_kiocb *req, u32 seq) |
7adf4eaf | 1859 | { |
2bc9930e JA |
1860 | if (unlikely(req->flags & REQ_F_IO_DRAIN)) { |
1861 | struct io_ring_ctx *ctx = req->ctx; | |
a197f664 | 1862 | |
8f6ed49a | 1863 | return seq + READ_ONCE(ctx->cq_extra) != ctx->cached_cq_tail; |
2bc9930e | 1864 | } |
de0617e4 | 1865 | |
9d858b21 | 1866 | return false; |
de0617e4 JA |
1867 | } |
1868 | ||
c97d8a0f PB |
1869 | static inline bool io_req_ffs_set(struct io_kiocb *req) |
1870 | { | |
35645ac3 | 1871 | return req->flags & REQ_F_FIXED_FILE; |
c97d8a0f PB |
1872 | } |
1873 | ||
fd08e530 PB |
1874 | static struct io_kiocb *__io_prep_linked_timeout(struct io_kiocb *req) |
1875 | { | |
906c6caa PB |
1876 | if (WARN_ON_ONCE(!req->link)) |
1877 | return NULL; | |
1878 | ||
4d13d1a4 PB |
1879 | req->flags &= ~REQ_F_ARM_LTIMEOUT; |
1880 | req->flags |= REQ_F_LINK_TIMEOUT; | |
fd08e530 PB |
1881 | |
1882 | /* linked timeouts should have two refs once prep'ed */ | |
48dcd38d | 1883 | io_req_set_refcount(req); |
4d13d1a4 PB |
1884 | __io_req_set_refcount(req->link, 2); |
1885 | return req->link; | |
fd08e530 PB |
1886 | } |
1887 | ||
1888 | static inline struct io_kiocb *io_prep_linked_timeout(struct io_kiocb *req) | |
1889 | { | |
4d13d1a4 | 1890 | if (likely(!(req->flags & REQ_F_ARM_LTIMEOUT))) |
fd08e530 PB |
1891 | return NULL; |
1892 | return __io_prep_linked_timeout(req); | |
1893 | } | |
1894 | ||
cb2d344c PB |
1895 | static noinline void __io_arm_ltimeout(struct io_kiocb *req) |
1896 | { | |
1897 | io_queue_linked_timeout(__io_prep_linked_timeout(req)); | |
1898 | } | |
1899 | ||
1900 | static inline void io_arm_ltimeout(struct io_kiocb *req) | |
1901 | { | |
1902 | if (unlikely(req->flags & REQ_F_ARM_LTIMEOUT)) | |
1903 | __io_arm_ltimeout(req); | |
1904 | } | |
1905 | ||
1e6fa521 JA |
1906 | static void io_prep_async_work(struct io_kiocb *req) |
1907 | { | |
1908 | const struct io_op_def *def = &io_op_defs[req->opcode]; | |
1e6fa521 JA |
1909 | struct io_ring_ctx *ctx = req->ctx; |
1910 | ||
b8e64b53 PB |
1911 | if (!(req->flags & REQ_F_CREDS)) { |
1912 | req->flags |= REQ_F_CREDS; | |
c10d1f98 | 1913 | req->creds = get_current_cred(); |
b8e64b53 | 1914 | } |
003e8dcc | 1915 | |
e1d675df PB |
1916 | req->work.list.next = NULL; |
1917 | req->work.flags = 0; | |
8e29da69 | 1918 | req->work.cancel_seq = atomic_read(&ctx->cancel_seq); |
feaadc4f PB |
1919 | if (req->flags & REQ_F_FORCE_ASYNC) |
1920 | req->work.flags |= IO_WQ_WORK_CONCURRENT; | |
1921 | ||
1e6fa521 JA |
1922 | if (req->flags & REQ_F_ISREG) { |
1923 | if (def->hash_reg_file || (ctx->flags & IORING_SETUP_IOPOLL)) | |
1924 | io_wq_hash_work(&req->work, file_inode(req->file)); | |
4b982bd0 | 1925 | } else if (!req->file || !S_ISBLK(file_inode(req->file)->i_mode)) { |
1e6fa521 JA |
1926 | if (def->unbound_nonreg_file) |
1927 | req->work.flags |= IO_WQ_WORK_UNBOUND; | |
1928 | } | |
561fb04a | 1929 | } |
cccf0ee8 | 1930 | |
cbdcb435 | 1931 | static void io_prep_async_link(struct io_kiocb *req) |
561fb04a | 1932 | { |
cbdcb435 | 1933 | struct io_kiocb *cur; |
54a91f3b | 1934 | |
44eff40a PB |
1935 | if (req->flags & REQ_F_LINK_TIMEOUT) { |
1936 | struct io_ring_ctx *ctx = req->ctx; | |
1937 | ||
674ee8e1 | 1938 | spin_lock_irq(&ctx->timeout_lock); |
44eff40a PB |
1939 | io_for_each_link(cur, req) |
1940 | io_prep_async_work(cur); | |
674ee8e1 | 1941 | spin_unlock_irq(&ctx->timeout_lock); |
44eff40a PB |
1942 | } else { |
1943 | io_for_each_link(cur, req) | |
1944 | io_prep_async_work(cur); | |
1945 | } | |
561fb04a JA |
1946 | } |
1947 | ||
fff4e40e PB |
1948 | static inline void io_req_add_compl_list(struct io_kiocb *req) |
1949 | { | |
775a1f2f | 1950 | struct io_submit_state *state = &req->ctx->submit_state; |
fff4e40e | 1951 | |
3d4aeb9f | 1952 | if (!(req->flags & REQ_F_CQE_SKIP)) |
775a1f2f | 1953 | state->flush_cqes = true; |
fff4e40e PB |
1954 | wq_list_add_tail(&req->comp_list, &state->compl_reqs); |
1955 | } | |
1956 | ||
77955efb | 1957 | static void io_queue_iowq(struct io_kiocb *req, bool *dont_use) |
561fb04a | 1958 | { |
cbdcb435 | 1959 | struct io_kiocb *link = io_prep_linked_timeout(req); |
5aa75ed5 | 1960 | struct io_uring_task *tctx = req->task->io_uring; |
561fb04a | 1961 | |
3bfe6106 JA |
1962 | BUG_ON(!tctx); |
1963 | BUG_ON(!tctx->io_wq); | |
561fb04a | 1964 | |
cbdcb435 PB |
1965 | /* init ->work of the whole link before punting */ |
1966 | io_prep_async_link(req); | |
991468dc JA |
1967 | |
1968 | /* | |
1969 | * Not expected to happen, but if we do have a bug where this _can_ | |
1970 | * happen, catch it here and ensure the request is marked as | |
1971 | * canceled. That will make io-wq go through the usual work cancel | |
1972 | * procedure rather than attempt to run this request (or create a new | |
1973 | * worker for it). | |
1974 | */ | |
1975 | if (WARN_ON_ONCE(!same_thread_group(req->task, current))) | |
1976 | req->work.flags |= IO_WQ_WORK_CANCEL; | |
1977 | ||
971cf9c1 PB |
1978 | trace_io_uring_queue_async_work(req->ctx, req, req->cqe.user_data, |
1979 | req->opcode, req->flags, &req->work, | |
1980 | io_wq_is_hashed(&req->work)); | |
ebf93667 | 1981 | io_wq_enqueue(tctx->io_wq, &req->work); |
7271ef3a JA |
1982 | if (link) |
1983 | io_queue_linked_timeout(link); | |
cbdcb435 PB |
1984 | } |
1985 | ||
1ee4160c | 1986 | static void io_kill_timeout(struct io_kiocb *req, int status) |
8c855885 | 1987 | __must_hold(&req->ctx->completion_lock) |
89850fce | 1988 | __must_hold(&req->ctx->timeout_lock) |
5262f567 | 1989 | { |
e8c2bc1f | 1990 | struct io_timeout_data *io = req->async_data; |
5262f567 | 1991 | |
fd9c7bc5 | 1992 | if (hrtimer_try_to_cancel(&io->timer) != -1) { |
2ae2eb9d PB |
1993 | if (status) |
1994 | req_set_fail(req); | |
01cec8c1 PB |
1995 | atomic_set(&req->ctx->cq_timeouts, |
1996 | atomic_read(&req->ctx->cq_timeouts) + 1); | |
135fcde8 | 1997 | list_del_init(&req->timeout.list); |
4e118cd9 | 1998 | io_req_tw_post_queue(req, status, 0); |
5262f567 JA |
1999 | } |
2000 | } | |
2001 | ||
c072481d | 2002 | static __cold void io_queue_deferred(struct io_ring_ctx *ctx) |
de0617e4 | 2003 | { |
441b8a78 | 2004 | while (!list_empty(&ctx->defer_list)) { |
27dc8338 PB |
2005 | struct io_defer_entry *de = list_first_entry(&ctx->defer_list, |
2006 | struct io_defer_entry, list); | |
de0617e4 | 2007 | |
9cf7c104 | 2008 | if (req_need_defer(de->req, de->seq)) |
04518945 | 2009 | break; |
27dc8338 | 2010 | list_del_init(&de->list); |
907d1df3 | 2011 | io_req_task_queue(de->req); |
27dc8338 | 2012 | kfree(de); |
441b8a78 | 2013 | } |
04518945 PB |
2014 | } |
2015 | ||
c072481d | 2016 | static __cold void io_flush_timeouts(struct io_ring_ctx *ctx) |
89850fce | 2017 | __must_hold(&ctx->completion_lock) |
de0617e4 | 2018 | { |
441b8a78 | 2019 | u32 seq = ctx->cached_cq_tail - atomic_read(&ctx->cq_timeouts); |
e677edbc | 2020 | struct io_kiocb *req, *tmp; |
f010505b | 2021 | |
79ebeaee | 2022 | spin_lock_irq(&ctx->timeout_lock); |
e677edbc | 2023 | list_for_each_entry_safe(req, tmp, &ctx->timeout_list, timeout.list) { |
f010505b | 2024 | u32 events_needed, events_got; |
de0617e4 | 2025 | |
8eb7e2d0 | 2026 | if (io_is_timeout_noseq(req)) |
360428f8 | 2027 | break; |
f010505b MDG |
2028 | |
2029 | /* | |
2030 | * Since seq can easily wrap around over time, subtract | |
2031 | * the last seq at which timeouts were flushed before comparing. | |
2032 | * Assuming not more than 2^31-1 events have happened since, | |
2033 | * these subtractions won't have wrapped, so we can check if | |
2034 | * target is in [last_seq, current_seq] by comparing the two. | |
2035 | */ | |
2036 | events_needed = req->timeout.target_seq - ctx->cq_last_tm_flush; | |
2037 | events_got = seq - ctx->cq_last_tm_flush; | |
2038 | if (events_got < events_needed) | |
360428f8 | 2039 | break; |
bfe68a22 | 2040 | |
1ee4160c | 2041 | io_kill_timeout(req, 0); |
f18ee4cf | 2042 | } |
f010505b | 2043 | ctx->cq_last_tm_flush = seq; |
79ebeaee | 2044 | spin_unlock_irq(&ctx->timeout_lock); |
360428f8 | 2045 | } |
5262f567 | 2046 | |
9333f6b4 PB |
2047 | static inline void io_commit_cqring(struct io_ring_ctx *ctx) |
2048 | { | |
2049 | /* order cqe stores with ring update */ | |
2050 | smp_store_release(&ctx->rings->cq.tail, ctx->cached_cq_tail); | |
2051 | } | |
2052 | ||
9aa8dfde | 2053 | static void __io_commit_cqring_flush(struct io_ring_ctx *ctx) |
360428f8 | 2054 | { |
9aa8dfde PB |
2055 | if (ctx->off_timeout_used || ctx->drain_active) { |
2056 | spin_lock(&ctx->completion_lock); | |
2057 | if (ctx->off_timeout_used) | |
2058 | io_flush_timeouts(ctx); | |
2059 | if (ctx->drain_active) | |
2060 | io_queue_deferred(ctx); | |
2061 | io_commit_cqring(ctx); | |
2062 | spin_unlock(&ctx->completion_lock); | |
2063 | } | |
2064 | if (ctx->has_evfd) | |
2065 | io_eventfd_signal(ctx); | |
de0617e4 JA |
2066 | } |
2067 | ||
90554200 JA |
2068 | static inline bool io_sqring_full(struct io_ring_ctx *ctx) |
2069 | { | |
2070 | struct io_rings *r = ctx->rings; | |
2071 | ||
a566c556 | 2072 | return READ_ONCE(r->sq.tail) - ctx->cached_sq_head == ctx->sq_entries; |
90554200 JA |
2073 | } |
2074 | ||
888aae2e PB |
2075 | static inline unsigned int __io_cqring_events(struct io_ring_ctx *ctx) |
2076 | { | |
2077 | return ctx->cached_cq_tail - READ_ONCE(ctx->rings->cq.head); | |
2078 | } | |
2079 | ||
d8da428b PB |
2080 | /* |
2081 | * writes to the cq entry need to come after reading head; the | |
2082 | * control dependency is enough as we're using WRITE_ONCE to | |
2083 | * fill the cq entry | |
2084 | */ | |
2085 | static noinline struct io_uring_cqe *__io_get_cqe(struct io_ring_ctx *ctx) | |
2b188cc1 | 2086 | { |
75b28aff | 2087 | struct io_rings *rings = ctx->rings; |
d8da428b | 2088 | unsigned int off = ctx->cached_cq_tail & (ctx->cq_entries - 1); |
2fee6bc6 | 2089 | unsigned int shift = 0; |
d8da428b PB |
2090 | unsigned int free, queued, len; |
2091 | ||
2fee6bc6 SR |
2092 | if (ctx->flags & IORING_SETUP_CQE32) |
2093 | shift = 1; | |
2094 | ||
d8da428b PB |
2095 | /* userspace may cheat modifying the tail, be safe and do min */ |
2096 | queued = min(__io_cqring_events(ctx), ctx->cq_entries); | |
2097 | free = ctx->cq_entries - queued; | |
2098 | /* we need a contiguous range, limit based on the current array offset */ | |
2099 | len = min(free, ctx->cq_entries - off); | |
2100 | if (!len) | |
2b188cc1 JA |
2101 | return NULL; |
2102 | ||
d8da428b PB |
2103 | ctx->cached_cq_tail++; |
2104 | ctx->cqe_cached = &rings->cqes[off]; | |
2105 | ctx->cqe_sentinel = ctx->cqe_cached + len; | |
2fee6bc6 SR |
2106 | ctx->cqe_cached++; |
2107 | return &rings->cqes[off << shift]; | |
d8da428b PB |
2108 | } |
2109 | ||
2110 | static inline struct io_uring_cqe *io_get_cqe(struct io_ring_ctx *ctx) | |
2111 | { | |
2112 | if (likely(ctx->cqe_cached < ctx->cqe_sentinel)) { | |
2fee6bc6 SR |
2113 | struct io_uring_cqe *cqe = ctx->cqe_cached; |
2114 | ||
2115 | if (ctx->flags & IORING_SETUP_CQE32) { | |
2116 | unsigned int off = ctx->cqe_cached - ctx->rings->cqes; | |
2117 | ||
2118 | cqe += off; | |
2119 | } | |
2120 | ||
d8da428b | 2121 | ctx->cached_cq_tail++; |
2fee6bc6 SR |
2122 | ctx->cqe_cached++; |
2123 | return cqe; | |
d8da428b | 2124 | } |
2fee6bc6 | 2125 | |
d8da428b | 2126 | return __io_get_cqe(ctx); |
2b188cc1 JA |
2127 | } |
2128 | ||
77bc59b4 | 2129 | static void io_eventfd_signal(struct io_ring_ctx *ctx) |
f2842ab5 | 2130 | { |
77bc59b4 UA |
2131 | struct io_ev_fd *ev_fd; |
2132 | ||
77bc59b4 UA |
2133 | rcu_read_lock(); |
2134 | /* | |
2135 | * rcu_dereference ctx->io_ev_fd once and use it for both for checking | |
2136 | * and eventfd_signal | |
2137 | */ | |
2138 | ev_fd = rcu_dereference(ctx->io_ev_fd); | |
2139 | ||
2140 | /* | |
2141 | * Check again if ev_fd exists incase an io_eventfd_unregister call | |
2142 | * completed between the NULL check of ctx->io_ev_fd at the start of | |
2143 | * the function and rcu_read_lock. | |
2144 | */ | |
2145 | if (unlikely(!ev_fd)) | |
2146 | goto out; | |
7e55a19c | 2147 | if (READ_ONCE(ctx->rings->cq_flags) & IORING_CQ_EVENTFD_DISABLED) |
77bc59b4 UA |
2148 | goto out; |
2149 | ||
c75312dd | 2150 | if (!ev_fd->eventfd_async || io_wq_current_is_worker()) |
77bc59b4 | 2151 | eventfd_signal(ev_fd->cq_ev_fd, 1); |
77bc59b4 UA |
2152 | out: |
2153 | rcu_read_unlock(); | |
f2842ab5 JA |
2154 | } |
2155 | ||
9aa8dfde PB |
2156 | static inline void io_cqring_wake(struct io_ring_ctx *ctx) |
2157 | { | |
2158 | /* | |
2159 | * wake_up_all() may seem excessive, but io_wake_function() and | |
2160 | * io_should_wake() handle the termination of the loop and only | |
2161 | * wake as many waiters as we need to. | |
2162 | */ | |
2163 | if (wq_has_sleeper(&ctx->cq_wait)) | |
2164 | wake_up_all(&ctx->cq_wait); | |
2165 | } | |
2166 | ||
2c5d763c JA |
2167 | /* |
2168 | * This should only get called when at least one event has been posted. | |
2169 | * Some applications rely on the eventfd notification count only changing | |
2170 | * IFF a new CQE has been added to the CQ ring. There's no depedency on | |
2171 | * 1:1 relationship between how many times this function is called (and | |
2172 | * hence the eventfd count) and number of CQEs posted to the CQ ring. | |
2173 | */ | |
66fc25ca | 2174 | static inline void io_cqring_ev_posted(struct io_ring_ctx *ctx) |
1d7bb1d5 | 2175 | { |
9aa8dfde PB |
2176 | if (unlikely(ctx->off_timeout_used || ctx->drain_active || |
2177 | ctx->has_evfd)) | |
9333f6b4 PB |
2178 | __io_commit_cqring_flush(ctx); |
2179 | ||
9aa8dfde | 2180 | io_cqring_wake(ctx); |
1d7bb1d5 JA |
2181 | } |
2182 | ||
80c18e4a PB |
2183 | static void io_cqring_ev_posted_iopoll(struct io_ring_ctx *ctx) |
2184 | { | |
9aa8dfde PB |
2185 | if (unlikely(ctx->off_timeout_used || ctx->drain_active || |
2186 | ctx->has_evfd)) | |
9333f6b4 PB |
2187 | __io_commit_cqring_flush(ctx); |
2188 | ||
9aa8dfde PB |
2189 | if (ctx->flags & IORING_SETUP_SQPOLL) |
2190 | io_cqring_wake(ctx); | |
80c18e4a PB |
2191 | } |
2192 | ||
c4a2ed72 | 2193 | /* Returns true if there are no backlogged entries after the flush */ |
6c2450ae | 2194 | static bool __io_cqring_overflow_flush(struct io_ring_ctx *ctx, bool force) |
1d7bb1d5 | 2195 | { |
b18032bb | 2196 | bool all_flushed, posted; |
e45a3e05 | 2197 | size_t cqe_size = sizeof(struct io_uring_cqe); |
1d7bb1d5 | 2198 | |
a566c556 | 2199 | if (!force && __io_cqring_events(ctx) == ctx->cq_entries) |
e23de15f | 2200 | return false; |
1d7bb1d5 | 2201 | |
e45a3e05 SR |
2202 | if (ctx->flags & IORING_SETUP_CQE32) |
2203 | cqe_size <<= 1; | |
2204 | ||
b18032bb | 2205 | posted = false; |
79ebeaee | 2206 | spin_lock(&ctx->completion_lock); |
6c2450ae | 2207 | while (!list_empty(&ctx->cq_overflow_list)) { |
d068b506 | 2208 | struct io_uring_cqe *cqe = io_get_cqe(ctx); |
6c2450ae | 2209 | struct io_overflow_cqe *ocqe; |
e6c8aa9a | 2210 | |
1d7bb1d5 JA |
2211 | if (!cqe && !force) |
2212 | break; | |
6c2450ae PB |
2213 | ocqe = list_first_entry(&ctx->cq_overflow_list, |
2214 | struct io_overflow_cqe, list); | |
2215 | if (cqe) | |
e45a3e05 | 2216 | memcpy(cqe, &ocqe->cqe, cqe_size); |
6c2450ae | 2217 | else |
8f6ed49a PB |
2218 | io_account_cq_overflow(ctx); |
2219 | ||
b18032bb | 2220 | posted = true; |
6c2450ae PB |
2221 | list_del(&ocqe->list); |
2222 | kfree(ocqe); | |
1d7bb1d5 JA |
2223 | } |
2224 | ||
09e88404 PB |
2225 | all_flushed = list_empty(&ctx->cq_overflow_list); |
2226 | if (all_flushed) { | |
10988a0a | 2227 | clear_bit(IO_CHECK_CQ_OVERFLOW_BIT, &ctx->check_cq); |
3a4b89a2 | 2228 | atomic_andnot(IORING_SQ_CQ_OVERFLOW, &ctx->rings->sq_flags); |
09e88404 | 2229 | } |
46930143 | 2230 | |
60053be8 | 2231 | io_commit_cqring(ctx); |
79ebeaee | 2232 | spin_unlock(&ctx->completion_lock); |
b18032bb JA |
2233 | if (posted) |
2234 | io_cqring_ev_posted(ctx); | |
09e88404 | 2235 | return all_flushed; |
1d7bb1d5 JA |
2236 | } |
2237 | ||
90f67366 | 2238 | static bool io_cqring_overflow_flush(struct io_ring_ctx *ctx) |
6c503150 | 2239 | { |
ca0a2651 JA |
2240 | bool ret = true; |
2241 | ||
10988a0a | 2242 | if (test_bit(IO_CHECK_CQ_OVERFLOW_BIT, &ctx->check_cq)) { |
6c503150 PB |
2243 | /* iopoll syncs against uring_lock, not completion_lock */ |
2244 | if (ctx->flags & IORING_SETUP_IOPOLL) | |
2245 | mutex_lock(&ctx->uring_lock); | |
90f67366 | 2246 | ret = __io_cqring_overflow_flush(ctx, false); |
6c503150 PB |
2247 | if (ctx->flags & IORING_SETUP_IOPOLL) |
2248 | mutex_unlock(&ctx->uring_lock); | |
2249 | } | |
ca0a2651 JA |
2250 | |
2251 | return ret; | |
6c503150 PB |
2252 | } |
2253 | ||
9d170164 | 2254 | static void __io_put_task(struct task_struct *task, int nr) |
6a290a14 PB |
2255 | { |
2256 | struct io_uring_task *tctx = task->io_uring; | |
2257 | ||
9d170164 PB |
2258 | percpu_counter_sub(&tctx->inflight, nr); |
2259 | if (unlikely(atomic_read(&tctx->in_idle))) | |
2260 | wake_up(&tctx->wait); | |
2261 | put_task_struct_many(task, nr); | |
2262 | } | |
2263 | ||
2264 | /* must to be called somewhat shortly after putting a request */ | |
2265 | static inline void io_put_task(struct task_struct *task, int nr) | |
2266 | { | |
2267 | if (likely(task == current)) | |
2268 | task->io_uring->cached_refs += nr; | |
2269 | else | |
2270 | __io_put_task(task, nr); | |
6a290a14 PB |
2271 | } |
2272 | ||
9a10867a PB |
2273 | static void io_task_refs_refill(struct io_uring_task *tctx) |
2274 | { | |
2275 | unsigned int refill = -tctx->cached_refs + IO_TCTX_REFS_CACHE_NR; | |
2276 | ||
2277 | percpu_counter_add(&tctx->inflight, refill); | |
2278 | refcount_add(refill, ¤t->usage); | |
2279 | tctx->cached_refs += refill; | |
2280 | } | |
2281 | ||
2282 | static inline void io_get_task_refs(int nr) | |
2283 | { | |
2284 | struct io_uring_task *tctx = current->io_uring; | |
2285 | ||
2286 | tctx->cached_refs -= nr; | |
2287 | if (unlikely(tctx->cached_refs < 0)) | |
2288 | io_task_refs_refill(tctx); | |
2289 | } | |
2290 | ||
3cc7fdb9 PB |
2291 | static __cold void io_uring_drop_tctx_refs(struct task_struct *task) |
2292 | { | |
2293 | struct io_uring_task *tctx = task->io_uring; | |
2294 | unsigned int refs = tctx->cached_refs; | |
2295 | ||
2296 | if (refs) { | |
2297 | tctx->cached_refs = 0; | |
2298 | percpu_counter_sub(&tctx->inflight, refs); | |
2299 | put_task_struct_many(task, refs); | |
2300 | } | |
2301 | } | |
2302 | ||
d4d19c19 | 2303 | static bool io_cqring_event_overflow(struct io_ring_ctx *ctx, u64 user_data, |
e45a3e05 SR |
2304 | s32 res, u32 cflags, u64 extra1, |
2305 | u64 extra2) | |
2b188cc1 | 2306 | { |
cce4b8b0 | 2307 | struct io_overflow_cqe *ocqe; |
e45a3e05 SR |
2308 | size_t ocq_size = sizeof(struct io_overflow_cqe); |
2309 | bool is_cqe32 = (ctx->flags & IORING_SETUP_CQE32); | |
2310 | ||
2311 | if (is_cqe32) | |
2312 | ocq_size += sizeof(struct io_uring_cqe); | |
2b188cc1 | 2313 | |
e45a3e05 | 2314 | ocqe = kmalloc(ocq_size, GFP_ATOMIC | __GFP_ACCOUNT); |
08dcd028 | 2315 | trace_io_uring_cqe_overflow(ctx, user_data, res, cflags, ocqe); |
cce4b8b0 PB |
2316 | if (!ocqe) { |
2317 | /* | |
2318 | * If we're in ring overflow flush mode, or in task cancel mode, | |
2319 | * or cannot allocate an overflow entry, then we need to drop it | |
2320 | * on the floor. | |
2321 | */ | |
8f6ed49a | 2322 | io_account_cq_overflow(ctx); |
155bc950 | 2323 | set_bit(IO_CHECK_CQ_DROPPED_BIT, &ctx->check_cq); |
cce4b8b0 | 2324 | return false; |
2b188cc1 | 2325 | } |
cce4b8b0 | 2326 | if (list_empty(&ctx->cq_overflow_list)) { |
10988a0a | 2327 | set_bit(IO_CHECK_CQ_OVERFLOW_BIT, &ctx->check_cq); |
3a4b89a2 | 2328 | atomic_or(IORING_SQ_CQ_OVERFLOW, &ctx->rings->sq_flags); |
20c0b380 | 2329 | |
cce4b8b0 | 2330 | } |
d4d19c19 | 2331 | ocqe->cqe.user_data = user_data; |
cce4b8b0 PB |
2332 | ocqe->cqe.res = res; |
2333 | ocqe->cqe.flags = cflags; | |
e45a3e05 SR |
2334 | if (is_cqe32) { |
2335 | ocqe->cqe.big_cqe[0] = extra1; | |
2336 | ocqe->cqe.big_cqe[1] = extra2; | |
2337 | } | |
cce4b8b0 PB |
2338 | list_add_tail(&ocqe->list, &ctx->cq_overflow_list); |
2339 | return true; | |
2b188cc1 JA |
2340 | } |
2341 | ||
ae4da189 | 2342 | static inline bool __io_fill_cqe(struct io_ring_ctx *ctx, u64 user_data, |
913a571a | 2343 | s32 res, u32 cflags) |
2b188cc1 JA |
2344 | { |
2345 | struct io_uring_cqe *cqe; | |
2346 | ||
2347 | /* | |
2348 | * If we can't get a cq entry, userspace overflowed the | |
2349 | * submission (by quite a lot). Increment the overflow count in | |
2350 | * the ring. | |
2351 | */ | |
d068b506 | 2352 | cqe = io_get_cqe(ctx); |
1d7bb1d5 | 2353 | if (likely(cqe)) { |
d4d19c19 | 2354 | WRITE_ONCE(cqe->user_data, user_data); |
2b188cc1 | 2355 | WRITE_ONCE(cqe->res, res); |
bcda7baa | 2356 | WRITE_ONCE(cqe->flags, cflags); |
8d13326e | 2357 | return true; |
2b188cc1 | 2358 | } |
e45a3e05 | 2359 | return io_cqring_event_overflow(ctx, user_data, res, cflags, 0, 0); |
2b188cc1 JA |
2360 | } |
2361 | ||
90e7c35f PB |
2362 | static inline bool __io_fill_cqe_req_filled(struct io_ring_ctx *ctx, |
2363 | struct io_kiocb *req) | |
d5ec1dfa | 2364 | { |
90e7c35f PB |
2365 | struct io_uring_cqe *cqe; |
2366 | ||
2367 | trace_io_uring_complete(req->ctx, req, req->cqe.user_data, | |
c4bb964f | 2368 | req->cqe.res, req->cqe.flags, 0, 0); |
90e7c35f PB |
2369 | |
2370 | /* | |
2371 | * If we can't get a cq entry, userspace overflowed the | |
2372 | * submission (by quite a lot). Increment the overflow count in | |
2373 | * the ring. | |
2374 | */ | |
2375 | cqe = io_get_cqe(ctx); | |
2376 | if (likely(cqe)) { | |
2377 | memcpy(cqe, &req->cqe, sizeof(*cqe)); | |
2378 | return true; | |
2379 | } | |
2380 | return io_cqring_event_overflow(ctx, req->cqe.user_data, | |
e45a3e05 | 2381 | req->cqe.res, req->cqe.flags, 0, 0); |
d5ec1dfa SR |
2382 | } |
2383 | ||
91658798 SR |
2384 | static inline bool __io_fill_cqe32_req_filled(struct io_ring_ctx *ctx, |
2385 | struct io_kiocb *req) | |
2386 | { | |
2387 | struct io_uring_cqe *cqe; | |
2388 | u64 extra1 = req->extra1; | |
2389 | u64 extra2 = req->extra2; | |
2390 | ||
2391 | trace_io_uring_complete(req->ctx, req, req->cqe.user_data, | |
c4bb964f | 2392 | req->cqe.res, req->cqe.flags, extra1, extra2); |
91658798 SR |
2393 | |
2394 | /* | |
2395 | * If we can't get a cq entry, userspace overflowed the | |
2396 | * submission (by quite a lot). Increment the overflow count in | |
2397 | * the ring. | |
2398 | */ | |
2399 | cqe = io_get_cqe(ctx); | |
2400 | if (likely(cqe)) { | |
2401 | memcpy(cqe, &req->cqe, sizeof(struct io_uring_cqe)); | |
2402 | cqe->big_cqe[0] = extra1; | |
2403 | cqe->big_cqe[1] = extra2; | |
2404 | return true; | |
2405 | } | |
2406 | ||
e45a3e05 SR |
2407 | return io_cqring_event_overflow(ctx, req->cqe.user_data, req->cqe.res, |
2408 | req->cqe.flags, extra1, extra2); | |
91658798 SR |
2409 | } |
2410 | ||
ae4da189 | 2411 | static inline bool __io_fill_cqe_req(struct io_kiocb *req, s32 res, u32 cflags) |
bcda7baa | 2412 | { |
c4bb964f | 2413 | trace_io_uring_complete(req->ctx, req, req->cqe.user_data, res, cflags, 0, 0); |
cef216fc | 2414 | return __io_fill_cqe(req->ctx, req->cqe.user_data, res, cflags); |
bcda7baa JA |
2415 | } |
2416 | ||
91658798 SR |
2417 | static inline void __io_fill_cqe32_req(struct io_kiocb *req, s32 res, u32 cflags, |
2418 | u64 extra1, u64 extra2) | |
2419 | { | |
2420 | struct io_ring_ctx *ctx = req->ctx; | |
2421 | struct io_uring_cqe *cqe; | |
2422 | ||
2423 | if (WARN_ON_ONCE(!(ctx->flags & IORING_SETUP_CQE32))) | |
2424 | return; | |
2425 | if (req->flags & REQ_F_CQE_SKIP) | |
2426 | return; | |
2427 | ||
c4bb964f SR |
2428 | trace_io_uring_complete(ctx, req, req->cqe.user_data, res, cflags, |
2429 | extra1, extra2); | |
91658798 SR |
2430 | |
2431 | /* | |
2432 | * If we can't get a cq entry, userspace overflowed the | |
2433 | * submission (by quite a lot). Increment the overflow count in | |
2434 | * the ring. | |
2435 | */ | |
2436 | cqe = io_get_cqe(ctx); | |
2437 | if (likely(cqe)) { | |
2438 | WRITE_ONCE(cqe->user_data, req->cqe.user_data); | |
2439 | WRITE_ONCE(cqe->res, res); | |
2440 | WRITE_ONCE(cqe->flags, cflags); | |
2441 | WRITE_ONCE(cqe->big_cqe[0], extra1); | |
2442 | WRITE_ONCE(cqe->big_cqe[1], extra2); | |
2443 | return; | |
2444 | } | |
2445 | ||
e45a3e05 | 2446 | io_cqring_event_overflow(ctx, req->cqe.user_data, res, cflags, extra1, extra2); |
91658798 SR |
2447 | } |
2448 | ||
913a571a PB |
2449 | static noinline bool io_fill_cqe_aux(struct io_ring_ctx *ctx, u64 user_data, |
2450 | s32 res, u32 cflags) | |
bcda7baa | 2451 | { |
913a571a | 2452 | ctx->cq_extra++; |
c4bb964f | 2453 | trace_io_uring_complete(ctx, NULL, user_data, res, cflags, 0, 0); |
ae4da189 | 2454 | return __io_fill_cqe(ctx, user_data, res, cflags); |
bcda7baa JA |
2455 | } |
2456 | ||
effcf8bd | 2457 | static void __io_req_complete_put(struct io_kiocb *req) |
2b188cc1 | 2458 | { |
c7dae4ba JA |
2459 | /* |
2460 | * If we're the last reference to this request, add to our locked | |
2461 | * free_list cache. | |
2462 | */ | |
de9b4cca | 2463 | if (req_ref_put_and_test(req)) { |
effcf8bd SR |
2464 | struct io_ring_ctx *ctx = req->ctx; |
2465 | ||
da1a08c5 | 2466 | if (req->flags & IO_REQ_LINK_FLAGS) { |
0756a869 | 2467 | if (req->flags & IO_DISARM_MASK) |
7a612350 PB |
2468 | io_disarm_next(req); |
2469 | if (req->link) { | |
2470 | io_req_task_queue(req->link); | |
2471 | req->link = NULL; | |
2472 | } | |
2473 | } | |
7ac1edc4 | 2474 | io_req_put_rsrc(req); |
8197b053 PB |
2475 | /* |
2476 | * Selected buffer deallocation in io_clean_op() assumes that | |
2477 | * we don't hold ->completion_lock. Clean them here to avoid | |
2478 | * deadlocks. | |
2479 | */ | |
2480 | io_put_kbuf_comp(req); | |
c7dae4ba JA |
2481 | io_dismantle_req(req); |
2482 | io_put_task(req->task, 1); | |
c2b6c6bc | 2483 | wq_list_add_head(&req->comp_list, &ctx->locked_free_list); |
d0acdee2 | 2484 | ctx->locked_free_nr++; |
180f829f | 2485 | } |
a37fae8a HX |
2486 | } |
2487 | ||
effcf8bd SR |
2488 | static void __io_req_complete_post(struct io_kiocb *req, s32 res, |
2489 | u32 cflags) | |
2490 | { | |
2491 | if (!(req->flags & REQ_F_CQE_SKIP)) | |
2492 | __io_fill_cqe_req(req, res, cflags); | |
2493 | __io_req_complete_put(req); | |
2494 | } | |
2495 | ||
2496 | static void __io_req_complete_post32(struct io_kiocb *req, s32 res, | |
2497 | u32 cflags, u64 extra1, u64 extra2) | |
2498 | { | |
2499 | if (!(req->flags & REQ_F_CQE_SKIP)) | |
2500 | __io_fill_cqe32_req(req, res, cflags, extra1, extra2); | |
2501 | __io_req_complete_put(req); | |
2502 | } | |
2503 | ||
2504 | static void io_req_complete_post(struct io_kiocb *req, s32 res, u32 cflags) | |
a37fae8a HX |
2505 | { |
2506 | struct io_ring_ctx *ctx = req->ctx; | |
2507 | ||
2508 | spin_lock(&ctx->completion_lock); | |
2509 | __io_req_complete_post(req, res, cflags); | |
7a612350 | 2510 | io_commit_cqring(ctx); |
79ebeaee | 2511 | spin_unlock(&ctx->completion_lock); |
a3f34907 | 2512 | io_cqring_ev_posted(ctx); |
4e3d9ff9 JA |
2513 | } |
2514 | ||
effcf8bd SR |
2515 | static void io_req_complete_post32(struct io_kiocb *req, s32 res, |
2516 | u32 cflags, u64 extra1, u64 extra2) | |
2517 | { | |
2518 | struct io_ring_ctx *ctx = req->ctx; | |
2519 | ||
2520 | spin_lock(&ctx->completion_lock); | |
2521 | __io_req_complete_post32(req, res, cflags, extra1, extra2); | |
2522 | io_commit_cqring(ctx); | |
2523 | spin_unlock(&ctx->completion_lock); | |
2524 | io_cqring_ev_posted(ctx); | |
2525 | } | |
2526 | ||
54daa9b2 PB |
2527 | static inline void io_req_complete_state(struct io_kiocb *req, s32 res, |
2528 | u32 cflags) | |
229a7b63 | 2529 | { |
cef216fc PB |
2530 | req->cqe.res = res; |
2531 | req->cqe.flags = cflags; | |
e342c807 | 2532 | req->flags |= REQ_F_COMPLETE_INLINE; |
e1e16097 JA |
2533 | } |
2534 | ||
889fca73 | 2535 | static inline void __io_req_complete(struct io_kiocb *req, unsigned issue_flags, |
54daa9b2 | 2536 | s32 res, u32 cflags) |
bcda7baa | 2537 | { |
889fca73 PB |
2538 | if (issue_flags & IO_URING_F_COMPLETE_DEFER) |
2539 | io_req_complete_state(req, res, cflags); | |
a38d68db | 2540 | else |
c7dae4ba | 2541 | io_req_complete_post(req, res, cflags); |
bcda7baa JA |
2542 | } |
2543 | ||
effcf8bd SR |
2544 | static inline void __io_req_complete32(struct io_kiocb *req, |
2545 | unsigned int issue_flags, s32 res, | |
2546 | u32 cflags, u64 extra1, u64 extra2) | |
2547 | { | |
2548 | if (issue_flags & IO_URING_F_COMPLETE_DEFER) { | |
2549 | io_req_complete_state(req, res, cflags); | |
2550 | req->extra1 = extra1; | |
2551 | req->extra2 = extra2; | |
2552 | } else { | |
2553 | io_req_complete_post32(req, res, cflags, extra1, extra2); | |
2554 | } | |
2555 | } | |
2556 | ||
54daa9b2 | 2557 | static inline void io_req_complete(struct io_kiocb *req, s32 res) |
0ddf92e8 | 2558 | { |
889fca73 | 2559 | __io_req_complete(req, 0, res, 0); |
0ddf92e8 JA |
2560 | } |
2561 | ||
54daa9b2 | 2562 | static void io_req_complete_failed(struct io_kiocb *req, s32 res) |
f41db273 | 2563 | { |
93d2bcd2 | 2564 | req_set_fail(req); |
ab0ac095 | 2565 | io_req_complete_post(req, res, io_put_kbuf(req, IO_URING_F_UNLOCKED)); |
f41db273 PB |
2566 | } |
2567 | ||
864ea921 PB |
2568 | /* |
2569 | * Don't initialise the fields below on every allocation, but do that in | |
2570 | * advance and keep them valid across allocations. | |
2571 | */ | |
2572 | static void io_preinit_req(struct io_kiocb *req, struct io_ring_ctx *ctx) | |
2573 | { | |
2574 | req->ctx = ctx; | |
2575 | req->link = NULL; | |
2576 | req->async_data = NULL; | |
2577 | /* not necessary, but safer to zero */ | |
cef216fc | 2578 | req->cqe.res = 0; |
864ea921 PB |
2579 | } |
2580 | ||
dac7a098 | 2581 | static void io_flush_cached_locked_reqs(struct io_ring_ctx *ctx, |
cd0ca2e0 | 2582 | struct io_submit_state *state) |
dac7a098 | 2583 | { |
79ebeaee | 2584 | spin_lock(&ctx->completion_lock); |
c2b6c6bc | 2585 | wq_list_splice(&ctx->locked_free_list, &state->free_list); |
d0acdee2 | 2586 | ctx->locked_free_nr = 0; |
79ebeaee | 2587 | spin_unlock(&ctx->completion_lock); |
dac7a098 PB |
2588 | } |
2589 | ||
88ab95be | 2590 | static inline bool io_req_cache_empty(struct io_ring_ctx *ctx) |
0ddf92e8 | 2591 | { |
88ab95be | 2592 | return !ctx->submit_state.free_list.next; |
0ddf92e8 JA |
2593 | } |
2594 | ||
5d5901a3 PB |
2595 | /* |
2596 | * A request might get retired back into the request caches even before opcode | |
2597 | * handlers and io_issue_sqe() are done with it, e.g. inline completion path. | |
2598 | * Because of that, io_alloc_req() should be called only under ->uring_lock | |
2599 | * and with extra caution to not get a request that is still worked on. | |
2600 | */ | |
c072481d | 2601 | static __cold bool __io_alloc_req_refill(struct io_ring_ctx *ctx) |
5d5901a3 | 2602 | __must_hold(&ctx->uring_lock) |
2b188cc1 | 2603 | { |
864ea921 | 2604 | gfp_t gfp = GFP_KERNEL | __GFP_NOWARN; |
3ab665b7 | 2605 | void *reqs[IO_REQ_ALLOC_BATCH]; |
864ea921 | 2606 | int ret, i; |
e5d1bc0a | 2607 | |
23a5c43b PB |
2608 | /* |
2609 | * If we have more than a batch's worth of requests in our IRQ side | |
2610 | * locked cache, grab the lock and move them over to our submission | |
2611 | * side cache. | |
2612 | */ | |
a6d97a8a | 2613 | if (data_race(ctx->locked_free_nr) > IO_COMPL_BATCH) { |
23a5c43b | 2614 | io_flush_cached_locked_reqs(ctx, &ctx->submit_state); |
88ab95be | 2615 | if (!io_req_cache_empty(ctx)) |
23a5c43b PB |
2616 | return true; |
2617 | } | |
e5d1bc0a | 2618 | |
3ab665b7 | 2619 | ret = kmem_cache_alloc_bulk(req_cachep, gfp, ARRAY_SIZE(reqs), reqs); |
fd6fab2c | 2620 | |
864ea921 PB |
2621 | /* |
2622 | * Bulk alloc is all-or-nothing. If we fail to get a batch, | |
2623 | * retry single alloc to be on the safe side. | |
2624 | */ | |
2625 | if (unlikely(ret <= 0)) { | |
3ab665b7 PB |
2626 | reqs[0] = kmem_cache_alloc(req_cachep, gfp); |
2627 | if (!reqs[0]) | |
a33ae9ce | 2628 | return false; |
864ea921 | 2629 | ret = 1; |
2b188cc1 | 2630 | } |
864ea921 | 2631 | |
37f0e767 | 2632 | percpu_ref_get_many(&ctx->refs, ret); |
3ab665b7 | 2633 | for (i = 0; i < ret; i++) { |
23a5c43b | 2634 | struct io_kiocb *req = reqs[i]; |
3ab665b7 PB |
2635 | |
2636 | io_preinit_req(req, ctx); | |
fa05457a | 2637 | io_req_add_to_cache(req, ctx); |
3ab665b7 | 2638 | } |
a33ae9ce PB |
2639 | return true; |
2640 | } | |
2641 | ||
2642 | static inline bool io_alloc_req_refill(struct io_ring_ctx *ctx) | |
2643 | { | |
88ab95be | 2644 | if (unlikely(io_req_cache_empty(ctx))) |
a33ae9ce PB |
2645 | return __io_alloc_req_refill(ctx); |
2646 | return true; | |
2647 | } | |
2648 | ||
2649 | static inline struct io_kiocb *io_alloc_req(struct io_ring_ctx *ctx) | |
2650 | { | |
2651 | struct io_wq_work_node *node; | |
2652 | ||
2653 | node = wq_stack_extract(&ctx->submit_state.free_list); | |
c2b6c6bc | 2654 | return container_of(node, struct io_kiocb, comp_list); |
2b188cc1 JA |
2655 | } |
2656 | ||
e1d767f0 | 2657 | static inline void io_put_file(struct file *file) |
8da11c19 | 2658 | { |
e1d767f0 | 2659 | if (file) |
8da11c19 PB |
2660 | fput(file); |
2661 | } | |
2662 | ||
6b639522 | 2663 | static inline void io_dismantle_req(struct io_kiocb *req) |
2b188cc1 | 2664 | { |
094bae49 | 2665 | unsigned int flags = req->flags; |
929a3af9 | 2666 | |
867f8fa5 | 2667 | if (unlikely(flags & IO_REQ_CLEAN_FLAGS)) |
3a0a6902 | 2668 | io_clean_op(req); |
e1d767f0 PB |
2669 | if (!(flags & REQ_F_FIXED_FILE)) |
2670 | io_put_file(req->file); | |
e65ef56d JA |
2671 | } |
2672 | ||
f5c6cf2a | 2673 | static __cold void io_free_req(struct io_kiocb *req) |
c6ca97b3 | 2674 | { |
51a4cc11 | 2675 | struct io_ring_ctx *ctx = req->ctx; |
c6ca97b3 | 2676 | |
7ac1edc4 | 2677 | io_req_put_rsrc(req); |
216578e5 | 2678 | io_dismantle_req(req); |
7c660731 | 2679 | io_put_task(req->task, 1); |
c6ca97b3 | 2680 | |
79ebeaee | 2681 | spin_lock(&ctx->completion_lock); |
c2b6c6bc | 2682 | wq_list_add_head(&req->comp_list, &ctx->locked_free_list); |
c34b025f | 2683 | ctx->locked_free_nr++; |
79ebeaee | 2684 | spin_unlock(&ctx->completion_lock); |
e65ef56d JA |
2685 | } |
2686 | ||
f2f87370 PB |
2687 | static inline void io_remove_next_linked(struct io_kiocb *req) |
2688 | { | |
2689 | struct io_kiocb *nxt = req->link; | |
2690 | ||
2691 | req->link = nxt->link; | |
2692 | nxt->link = NULL; | |
2693 | } | |
2694 | ||
81ec803b | 2695 | static struct io_kiocb *io_disarm_linked_timeout(struct io_kiocb *req) |
33cc89a9 | 2696 | __must_hold(&req->ctx->completion_lock) |
89b263f6 | 2697 | __must_hold(&req->ctx->timeout_lock) |
2665abfd | 2698 | { |
33cc89a9 | 2699 | struct io_kiocb *link = req->link; |
f2f87370 | 2700 | |
b97e736a | 2701 | if (link && link->opcode == IORING_OP_LINK_TIMEOUT) { |
c9abd7ad | 2702 | struct io_timeout_data *io = link->async_data; |
7c86ffee | 2703 | |
f2f87370 | 2704 | io_remove_next_linked(req); |
90cd7e42 | 2705 | link->timeout.head = NULL; |
fd9c7bc5 | 2706 | if (hrtimer_try_to_cancel(&io->timer) != -1) { |
ef9dd637 | 2707 | list_del(&link->timeout.list); |
81ec803b | 2708 | return link; |
c9abd7ad PB |
2709 | } |
2710 | } | |
81ec803b | 2711 | return NULL; |
7c86ffee PB |
2712 | } |
2713 | ||
d148ca4b | 2714 | static void io_fail_links(struct io_kiocb *req) |
33cc89a9 | 2715 | __must_hold(&req->ctx->completion_lock) |
9e645e11 | 2716 | { |
33cc89a9 | 2717 | struct io_kiocb *nxt, *link = req->link; |
04c76b41 | 2718 | bool ignore_cqes = req->flags & REQ_F_SKIP_LINK_CQES; |
9e645e11 | 2719 | |
f2f87370 | 2720 | req->link = NULL; |
f2f87370 | 2721 | while (link) { |
a8295b98 HX |
2722 | long res = -ECANCELED; |
2723 | ||
2724 | if (link->flags & REQ_F_FAIL) | |
cef216fc | 2725 | res = link->cqe.res; |
a8295b98 | 2726 | |
f2f87370 PB |
2727 | nxt = link->link; |
2728 | link->link = NULL; | |
2665abfd | 2729 | |
cef216fc | 2730 | trace_io_uring_fail_link(req->ctx, req, req->cqe.user_data, |
502c87d6 SR |
2731 | req->opcode, link); |
2732 | ||
4e118cd9 PB |
2733 | if (ignore_cqes) |
2734 | link->flags |= REQ_F_CQE_SKIP; | |
2735 | else | |
04c76b41 | 2736 | link->flags &= ~REQ_F_CQE_SKIP; |
4e118cd9 | 2737 | __io_req_complete_post(link, res, 0); |
f2f87370 | 2738 | link = nxt; |
9e645e11 | 2739 | } |
33cc89a9 | 2740 | } |
9e645e11 | 2741 | |
33cc89a9 PB |
2742 | static bool io_disarm_next(struct io_kiocb *req) |
2743 | __must_hold(&req->ctx->completion_lock) | |
2744 | { | |
81ec803b | 2745 | struct io_kiocb *link = NULL; |
33cc89a9 PB |
2746 | bool posted = false; |
2747 | ||
0756a869 | 2748 | if (req->flags & REQ_F_ARM_LTIMEOUT) { |
81ec803b | 2749 | link = req->link; |
906c6caa | 2750 | req->flags &= ~REQ_F_ARM_LTIMEOUT; |
0756a869 PB |
2751 | if (link && link->opcode == IORING_OP_LINK_TIMEOUT) { |
2752 | io_remove_next_linked(req); | |
4e118cd9 | 2753 | io_req_tw_post_queue(link, -ECANCELED, 0); |
0756a869 PB |
2754 | posted = true; |
2755 | } | |
2756 | } else if (req->flags & REQ_F_LINK_TIMEOUT) { | |
89b263f6 JA |
2757 | struct io_ring_ctx *ctx = req->ctx; |
2758 | ||
2759 | spin_lock_irq(&ctx->timeout_lock); | |
81ec803b | 2760 | link = io_disarm_linked_timeout(req); |
89b263f6 | 2761 | spin_unlock_irq(&ctx->timeout_lock); |
81ec803b PB |
2762 | if (link) { |
2763 | posted = true; | |
2764 | io_req_tw_post_queue(link, -ECANCELED, 0); | |
2765 | } | |
89b263f6 | 2766 | } |
93d2bcd2 | 2767 | if (unlikely((req->flags & REQ_F_FAIL) && |
e4335ed3 | 2768 | !(req->flags & REQ_F_HARDLINK))) { |
33cc89a9 PB |
2769 | posted |= (req->link != NULL); |
2770 | io_fail_links(req); | |
2771 | } | |
2772 | return posted; | |
9e645e11 JA |
2773 | } |
2774 | ||
d81499bf PB |
2775 | static void __io_req_find_next_prep(struct io_kiocb *req) |
2776 | { | |
2777 | struct io_ring_ctx *ctx = req->ctx; | |
2778 | bool posted; | |
2779 | ||
2780 | spin_lock(&ctx->completion_lock); | |
2781 | posted = io_disarm_next(req); | |
60053be8 | 2782 | io_commit_cqring(ctx); |
d81499bf PB |
2783 | spin_unlock(&ctx->completion_lock); |
2784 | if (posted) | |
2785 | io_cqring_ev_posted(ctx); | |
2786 | } | |
2787 | ||
2788 | static inline struct io_kiocb *io_req_find_next(struct io_kiocb *req) | |
c69f8dbe | 2789 | { |
33cc89a9 | 2790 | struct io_kiocb *nxt; |
944e58bf | 2791 | |
9e645e11 JA |
2792 | /* |
2793 | * If LINK is set, we have dependent requests in this chain. If we | |
2794 | * didn't fail this request, queue the first one up, moving any other | |
2795 | * dependencies to the next request. In case of failure, fail the rest | |
2796 | * of the chain. | |
2797 | */ | |
d81499bf PB |
2798 | if (unlikely(req->flags & IO_DISARM_MASK)) |
2799 | __io_req_find_next_prep(req); | |
33cc89a9 PB |
2800 | nxt = req->link; |
2801 | req->link = NULL; | |
2802 | return nxt; | |
4d7dd462 | 2803 | } |
9e645e11 | 2804 | |
f237c30a | 2805 | static void ctx_flush_and_put(struct io_ring_ctx *ctx, bool *locked) |
2c32395d PB |
2806 | { |
2807 | if (!ctx) | |
2808 | return; | |
ef060ea9 JA |
2809 | if (ctx->flags & IORING_SETUP_TASKRUN_FLAG) |
2810 | atomic_andnot(IORING_SQ_TASKRUN, &ctx->rings->sq_flags); | |
f237c30a | 2811 | if (*locked) { |
c450178d | 2812 | io_submit_flush_completions(ctx); |
2c32395d | 2813 | mutex_unlock(&ctx->uring_lock); |
f237c30a | 2814 | *locked = false; |
2c32395d PB |
2815 | } |
2816 | percpu_ref_put(&ctx->refs); | |
2817 | } | |
2818 | ||
f28c240e HX |
2819 | static inline void ctx_commit_and_unlock(struct io_ring_ctx *ctx) |
2820 | { | |
2821 | io_commit_cqring(ctx); | |
2822 | spin_unlock(&ctx->completion_lock); | |
2823 | io_cqring_ev_posted(ctx); | |
2824 | } | |
2825 | ||
2826 | static void handle_prev_tw_list(struct io_wq_work_node *node, | |
2827 | struct io_ring_ctx **ctx, bool *uring_locked) | |
2828 | { | |
2829 | if (*ctx && !*uring_locked) | |
2830 | spin_lock(&(*ctx)->completion_lock); | |
2831 | ||
2832 | do { | |
2833 | struct io_wq_work_node *next = node->next; | |
2834 | struct io_kiocb *req = container_of(node, struct io_kiocb, | |
2835 | io_task_work.node); | |
2836 | ||
34d2bfe7 JA |
2837 | prefetch(container_of(next, struct io_kiocb, io_task_work.node)); |
2838 | ||
f28c240e HX |
2839 | if (req->ctx != *ctx) { |
2840 | if (unlikely(!*uring_locked && *ctx)) | |
2841 | ctx_commit_and_unlock(*ctx); | |
2842 | ||
2843 | ctx_flush_and_put(*ctx, uring_locked); | |
2844 | *ctx = req->ctx; | |
2845 | /* if not contended, grab and improve batching */ | |
2846 | *uring_locked = mutex_trylock(&(*ctx)->uring_lock); | |
2847 | percpu_ref_get(&(*ctx)->refs); | |
2848 | if (unlikely(!*uring_locked)) | |
2849 | spin_lock(&(*ctx)->completion_lock); | |
2850 | } | |
2851 | if (likely(*uring_locked)) | |
2852 | req->io_task_work.func(req, uring_locked); | |
2853 | else | |
cef216fc | 2854 | __io_req_complete_post(req, req->cqe.res, |
cc3cec83 | 2855 | io_put_kbuf_comp(req)); |
f28c240e HX |
2856 | node = next; |
2857 | } while (node); | |
2858 | ||
2859 | if (unlikely(!*uring_locked)) | |
2860 | ctx_commit_and_unlock(*ctx); | |
2861 | } | |
2862 | ||
2863 | static void handle_tw_list(struct io_wq_work_node *node, | |
2864 | struct io_ring_ctx **ctx, bool *locked) | |
9f8d032a HX |
2865 | { |
2866 | do { | |
2867 | struct io_wq_work_node *next = node->next; | |
2868 | struct io_kiocb *req = container_of(node, struct io_kiocb, | |
2869 | io_task_work.node); | |
2870 | ||
34d2bfe7 JA |
2871 | prefetch(container_of(next, struct io_kiocb, io_task_work.node)); |
2872 | ||
9f8d032a HX |
2873 | if (req->ctx != *ctx) { |
2874 | ctx_flush_and_put(*ctx, locked); | |
2875 | *ctx = req->ctx; | |
2876 | /* if not contended, grab and improve batching */ | |
2877 | *locked = mutex_trylock(&(*ctx)->uring_lock); | |
2878 | percpu_ref_get(&(*ctx)->refs); | |
2879 | } | |
2880 | req->io_task_work.func(req, locked); | |
2881 | node = next; | |
2882 | } while (node); | |
2883 | } | |
2884 | ||
7cbf1722 | 2885 | static void tctx_task_work(struct callback_head *cb) |
c40f6379 | 2886 | { |
f28c240e | 2887 | bool uring_locked = false; |
ebd0df2e | 2888 | struct io_ring_ctx *ctx = NULL; |
3f18407d PB |
2889 | struct io_uring_task *tctx = container_of(cb, struct io_uring_task, |
2890 | task_work); | |
c40f6379 | 2891 | |
16f72070 | 2892 | while (1) { |
f28c240e | 2893 | struct io_wq_work_node *node1, *node2; |
3f18407d PB |
2894 | |
2895 | spin_lock_irq(&tctx->task_lock); | |
f28c240e HX |
2896 | node1 = tctx->prior_task_list.first; |
2897 | node2 = tctx->task_list.first; | |
3f18407d | 2898 | INIT_WQ_LIST(&tctx->task_list); |
f28c240e HX |
2899 | INIT_WQ_LIST(&tctx->prior_task_list); |
2900 | if (!node2 && !node1) | |
6294f368 | 2901 | tctx->task_running = false; |
3f18407d | 2902 | spin_unlock_irq(&tctx->task_lock); |
f28c240e | 2903 | if (!node2 && !node1) |
6294f368 | 2904 | break; |
3f18407d | 2905 | |
f28c240e HX |
2906 | if (node1) |
2907 | handle_prev_tw_list(node1, &ctx, &uring_locked); | |
f28c240e HX |
2908 | if (node2) |
2909 | handle_tw_list(node2, &ctx, &uring_locked); | |
7cbf1722 | 2910 | cond_resched(); |
68ca8fc0 | 2911 | |
a6d97a8a PB |
2912 | if (data_race(!tctx->task_list.first) && |
2913 | data_race(!tctx->prior_task_list.first) && uring_locked) | |
68ca8fc0 | 2914 | io_submit_flush_completions(ctx); |
3f18407d | 2915 | } |
ebd0df2e | 2916 | |
f28c240e | 2917 | ctx_flush_and_put(ctx, &uring_locked); |
3cc7fdb9 PB |
2918 | |
2919 | /* relaxed read is enough as only the task itself sets ->in_idle */ | |
2920 | if (unlikely(atomic_read(&tctx->in_idle))) | |
2921 | io_uring_drop_tctx_refs(current); | |
7cbf1722 JA |
2922 | } |
2923 | ||
4813c377 | 2924 | static void io_req_task_work_add(struct io_kiocb *req, bool priority) |
7cbf1722 | 2925 | { |
c15b79de | 2926 | struct task_struct *tsk = req->task; |
9f010507 | 2927 | struct io_ring_ctx *ctx = req->ctx; |
7cbf1722 | 2928 | struct io_uring_task *tctx = tsk->io_uring; |
e09ee510 | 2929 | struct io_wq_work_node *node; |
0b81e80c | 2930 | unsigned long flags; |
6294f368 | 2931 | bool running; |
7cbf1722 JA |
2932 | |
2933 | WARN_ON_ONCE(!tctx); | |
2934 | ||
d5361233 JA |
2935 | io_drop_inflight_file(req); |
2936 | ||
0b81e80c | 2937 | spin_lock_irqsave(&tctx->task_lock, flags); |
4813c377 HX |
2938 | if (priority) |
2939 | wq_list_add_tail(&req->io_task_work.node, &tctx->prior_task_list); | |
2940 | else | |
2941 | wq_list_add_tail(&req->io_task_work.node, &tctx->task_list); | |
6294f368 PB |
2942 | running = tctx->task_running; |
2943 | if (!running) | |
2944 | tctx->task_running = true; | |
0b81e80c | 2945 | spin_unlock_irqrestore(&tctx->task_lock, flags); |
7cbf1722 JA |
2946 | |
2947 | /* task_work already pending, we're done */ | |
6294f368 | 2948 | if (running) |
e09ee510 | 2949 | return; |
7cbf1722 | 2950 | |
ef060ea9 JA |
2951 | if (ctx->flags & IORING_SETUP_TASKRUN_FLAG) |
2952 | atomic_or(IORING_SQ_TASKRUN, &ctx->rings->sq_flags); | |
2953 | ||
9f010507 | 2954 | if (likely(!task_work_add(tsk, &tctx->task_work, ctx->notify_method))) |
e09ee510 | 2955 | return; |
2215bed9 | 2956 | |
0b81e80c | 2957 | spin_lock_irqsave(&tctx->task_lock, flags); |
6294f368 | 2958 | tctx->task_running = false; |
4813c377 | 2959 | node = wq_list_merge(&tctx->prior_task_list, &tctx->task_list); |
0b81e80c | 2960 | spin_unlock_irqrestore(&tctx->task_lock, flags); |
7cbf1722 | 2961 | |
e09ee510 PB |
2962 | while (node) { |
2963 | req = container_of(node, struct io_kiocb, io_task_work.node); | |
2964 | node = node->next; | |
2965 | if (llist_add(&req->io_task_work.fallback_node, | |
2966 | &req->ctx->fallback_llist)) | |
2967 | schedule_delayed_work(&req->ctx->fallback_work, 1); | |
2968 | } | |
eab30c4d PB |
2969 | } |
2970 | ||
4e118cd9 | 2971 | static void io_req_tw_post(struct io_kiocb *req, bool *locked) |
c40f6379 | 2972 | { |
4e118cd9 PB |
2973 | io_req_complete_post(req, req->cqe.res, req->cqe.flags); |
2974 | } | |
c40f6379 | 2975 | |
4e118cd9 PB |
2976 | static void io_req_tw_post_queue(struct io_kiocb *req, s32 res, u32 cflags) |
2977 | { | |
2978 | req->cqe.res = res; | |
2979 | req->cqe.flags = cflags; | |
2980 | req->io_task_work.func = io_req_tw_post; | |
2981 | io_req_task_work_add(req, false); | |
2982 | } | |
2983 | ||
f237c30a | 2984 | static void io_req_task_cancel(struct io_kiocb *req, bool *locked) |
c40f6379 | 2985 | { |
b18a1a45 | 2986 | /* not needed for normal modes, but SQPOLL depends on it */ |
971cf9c1 | 2987 | io_tw_lock(req->ctx, locked); |
cef216fc | 2988 | io_req_complete_failed(req, req->cqe.res); |
c40f6379 JA |
2989 | } |
2990 | ||
f237c30a | 2991 | static void io_req_task_submit(struct io_kiocb *req, bool *locked) |
c40f6379 | 2992 | { |
971cf9c1 | 2993 | io_tw_lock(req->ctx, locked); |
316319e8 | 2994 | /* req->task == current here, checking PF_EXITING is safe */ |
af066f31 | 2995 | if (likely(!(req->task->flags & PF_EXITING))) |
cbc2e203 | 2996 | io_queue_sqe(req); |
81b6d05c | 2997 | else |
2593553a | 2998 | io_req_complete_failed(req, -EFAULT); |
c40f6379 JA |
2999 | } |
3000 | ||
2c4b8eb6 | 3001 | static void io_req_task_queue_fail(struct io_kiocb *req, int ret) |
c40f6379 | 3002 | { |
cef216fc | 3003 | req->cqe.res = ret; |
5b0a6acc | 3004 | req->io_task_work.func = io_req_task_cancel; |
4813c377 | 3005 | io_req_task_work_add(req, false); |
c40f6379 JA |
3006 | } |
3007 | ||
2c4b8eb6 | 3008 | static void io_req_task_queue(struct io_kiocb *req) |
a3df7698 | 3009 | { |
5b0a6acc | 3010 | req->io_task_work.func = io_req_task_submit; |
4813c377 | 3011 | io_req_task_work_add(req, false); |
a3df7698 PB |
3012 | } |
3013 | ||
773af691 JA |
3014 | static void io_req_task_queue_reissue(struct io_kiocb *req) |
3015 | { | |
77955efb | 3016 | req->io_task_work.func = io_queue_iowq; |
4813c377 | 3017 | io_req_task_work_add(req, false); |
773af691 JA |
3018 | } |
3019 | ||
57859f4d | 3020 | static void io_queue_next(struct io_kiocb *req) |
c69f8dbe | 3021 | { |
9b5f7bd9 | 3022 | struct io_kiocb *nxt = io_req_find_next(req); |
944e58bf PB |
3023 | |
3024 | if (nxt) | |
906a8c3f | 3025 | io_req_task_queue(nxt); |
c69f8dbe JL |
3026 | } |
3027 | ||
3aa83bfb | 3028 | static void io_free_batch_list(struct io_ring_ctx *ctx, |
1cce17ac | 3029 | struct io_wq_work_node *node) |
3aa83bfb | 3030 | __must_hold(&ctx->uring_lock) |
5af1d13e | 3031 | { |
d4b7a5ef | 3032 | struct task_struct *task = NULL; |
37f0e767 | 3033 | int task_refs = 0; |
5af1d13e | 3034 | |
3aa83bfb PB |
3035 | do { |
3036 | struct io_kiocb *req = container_of(node, struct io_kiocb, | |
3037 | comp_list); | |
2d6500d4 | 3038 | |
a538be5b PB |
3039 | if (unlikely(req->flags & IO_REQ_CLEAN_SLOW_FLAGS)) { |
3040 | if (req->flags & REQ_F_REFCOUNT) { | |
3041 | node = req->comp_list.next; | |
3042 | if (!req_ref_put_and_test(req)) | |
3043 | continue; | |
3044 | } | |
b605a7fa PB |
3045 | if ((req->flags & REQ_F_POLLED) && req->apoll) { |
3046 | struct async_poll *apoll = req->apoll; | |
3047 | ||
3048 | if (apoll->double_poll) | |
3049 | kfree(apoll->double_poll); | |
3050 | list_add(&apoll->poll.wait.entry, | |
3051 | &ctx->apoll_cache); | |
3052 | req->flags &= ~REQ_F_POLLED; | |
3053 | } | |
da1a08c5 | 3054 | if (req->flags & IO_REQ_LINK_FLAGS) |
57859f4d | 3055 | io_queue_next(req); |
a538be5b PB |
3056 | if (unlikely(req->flags & IO_REQ_CLEAN_FLAGS)) |
3057 | io_clean_op(req); | |
c1e53a69 | 3058 | } |
a538be5b PB |
3059 | if (!(req->flags & REQ_F_FIXED_FILE)) |
3060 | io_put_file(req->file); | |
2d6500d4 | 3061 | |
ab409402 | 3062 | io_req_put_rsrc_locked(req, ctx); |
5af1d13e | 3063 | |
d4b7a5ef PB |
3064 | if (req->task != task) { |
3065 | if (task) | |
3066 | io_put_task(task, task_refs); | |
3067 | task = req->task; | |
3068 | task_refs = 0; | |
3069 | } | |
3070 | task_refs++; | |
c1e53a69 | 3071 | node = req->comp_list.next; |
fa05457a | 3072 | io_req_add_to_cache(req, ctx); |
3aa83bfb | 3073 | } while (node); |
d4b7a5ef | 3074 | |
d4b7a5ef PB |
3075 | if (task) |
3076 | io_put_task(task, task_refs); | |
7a743e22 PB |
3077 | } |
3078 | ||
c450178d | 3079 | static void __io_submit_flush_completions(struct io_ring_ctx *ctx) |
a141dd89 | 3080 | __must_hold(&ctx->uring_lock) |
905c172f | 3081 | { |
6f33b0bc | 3082 | struct io_wq_work_node *node, *prev; |
cd0ca2e0 | 3083 | struct io_submit_state *state = &ctx->submit_state; |
905c172f | 3084 | |
3d4aeb9f PB |
3085 | if (state->flush_cqes) { |
3086 | spin_lock(&ctx->completion_lock); | |
3087 | wq_list_for_each(node, prev, &state->compl_reqs) { | |
3088 | struct io_kiocb *req = container_of(node, struct io_kiocb, | |
6f33b0bc | 3089 | comp_list); |
5182ed2e | 3090 | |
0e2e5c47 SR |
3091 | if (!(req->flags & REQ_F_CQE_SKIP)) { |
3092 | if (!(ctx->flags & IORING_SETUP_CQE32)) | |
3093 | __io_fill_cqe_req_filled(ctx, req); | |
3094 | else | |
3095 | __io_fill_cqe32_req_filled(ctx, req); | |
3096 | } | |
3d4aeb9f PB |
3097 | } |
3098 | ||
3099 | io_commit_cqring(ctx); | |
3100 | spin_unlock(&ctx->completion_lock); | |
3101 | io_cqring_ev_posted(ctx); | |
3102 | state->flush_cqes = false; | |
905c172f | 3103 | } |
5182ed2e | 3104 | |
1cce17ac | 3105 | io_free_batch_list(ctx, state->compl_reqs.first); |
6f33b0bc | 3106 | INIT_WQ_LIST(&state->compl_reqs); |
7a743e22 PB |
3107 | } |
3108 | ||
ba816ad6 JA |
3109 | /* |
3110 | * Drop reference to request, return next in chain (if there is one) if this | |
3111 | * was the last reference to this request. | |
3112 | */ | |
0d85035a | 3113 | static inline struct io_kiocb *io_put_req_find_next(struct io_kiocb *req) |
e65ef56d | 3114 | { |
9b5f7bd9 PB |
3115 | struct io_kiocb *nxt = NULL; |
3116 | ||
de9b4cca | 3117 | if (req_ref_put_and_test(req)) { |
da1a08c5 | 3118 | if (unlikely(req->flags & IO_REQ_LINK_FLAGS)) |
7819a1f6 | 3119 | nxt = io_req_find_next(req); |
f5c6cf2a | 3120 | io_free_req(req); |
2a44f467 | 3121 | } |
9b5f7bd9 | 3122 | return nxt; |
2b188cc1 JA |
3123 | } |
3124 | ||
0d85035a | 3125 | static inline void io_put_req(struct io_kiocb *req) |
216578e5 | 3126 | { |
91c2f697 | 3127 | if (req_ref_put_and_test(req)) { |
f5c6cf2a | 3128 | io_queue_next(req); |
e65ef56d | 3129 | io_free_req(req); |
543af3a1 | 3130 | } |
216578e5 PB |
3131 | } |
3132 | ||
6c503150 | 3133 | static unsigned io_cqring_events(struct io_ring_ctx *ctx) |
a3a0e43f JA |
3134 | { |
3135 | /* See comment at the top of this file */ | |
3136 | smp_rmb(); | |
e23de15f | 3137 | return __io_cqring_events(ctx); |
a3a0e43f JA |
3138 | } |
3139 | ||
fb5ccc98 PB |
3140 | static inline unsigned int io_sqring_entries(struct io_ring_ctx *ctx) |
3141 | { | |
3142 | struct io_rings *rings = ctx->rings; | |
3143 | ||
3144 | /* make sure SQ entry isn't read before tail */ | |
3145 | return smp_load_acquire(&rings->sq.tail) - ctx->cached_sq_head; | |
3146 | } | |
3147 | ||
4c6e277c JA |
3148 | static inline bool io_run_task_work(void) |
3149 | { | |
7f62d40d | 3150 | if (test_thread_flag(TIF_NOTIFY_SIGNAL) || task_work_pending(current)) { |
4c6e277c | 3151 | __set_current_state(TASK_RUNNING); |
7c5d8fa6 EB |
3152 | clear_notify_signal(); |
3153 | if (task_work_pending(current)) | |
3154 | task_work_run(); | |
4c6e277c JA |
3155 | return true; |
3156 | } | |
3157 | ||
3158 | return false; | |
bcda7baa JA |
3159 | } |
3160 | ||
5ba3c874 | 3161 | static int io_do_iopoll(struct io_ring_ctx *ctx, bool force_nonspin) |
def596e9 | 3162 | { |
5eef4e87 | 3163 | struct io_wq_work_node *pos, *start, *prev; |
d729cf9a | 3164 | unsigned int poll_flags = BLK_POLL_NOSLEEP; |
b688f11e | 3165 | DEFINE_IO_COMP_BATCH(iob); |
5ba3c874 | 3166 | int nr_events = 0; |
def596e9 JA |
3167 | |
3168 | /* | |
3169 | * Only spin for completions if we don't have multiple devices hanging | |
87a115fb | 3170 | * off our complete list. |
def596e9 | 3171 | */ |
87a115fb | 3172 | if (ctx->poll_multi_queue || force_nonspin) |
ef99b2d3 | 3173 | poll_flags |= BLK_POLL_ONESHOT; |
def596e9 | 3174 | |
5eef4e87 PB |
3175 | wq_list_for_each(pos, start, &ctx->iopoll_list) { |
3176 | struct io_kiocb *req = container_of(pos, struct io_kiocb, comp_list); | |
9adbd45d | 3177 | struct kiocb *kiocb = &req->rw.kiocb; |
a2416e1e | 3178 | int ret; |
def596e9 JA |
3179 | |
3180 | /* | |
581f9810 BM |
3181 | * Move completed and retryable entries to our local lists. |
3182 | * If we find a request that requires polling, break out | |
3183 | * and complete those lists first, if we have entries there. | |
def596e9 | 3184 | */ |
e3f721e6 | 3185 | if (READ_ONCE(req->iopoll_completed)) |
def596e9 JA |
3186 | break; |
3187 | ||
b688f11e | 3188 | ret = kiocb->ki_filp->f_op->iopoll(kiocb, &iob, poll_flags); |
a2416e1e PB |
3189 | if (unlikely(ret < 0)) |
3190 | return ret; | |
3191 | else if (ret) | |
ef99b2d3 | 3192 | poll_flags |= BLK_POLL_ONESHOT; |
def596e9 | 3193 | |
3aadc23e | 3194 | /* iopoll may have completed current req */ |
b688f11e JA |
3195 | if (!rq_list_empty(iob.req_list) || |
3196 | READ_ONCE(req->iopoll_completed)) | |
e3f721e6 | 3197 | break; |
def596e9 JA |
3198 | } |
3199 | ||
b688f11e JA |
3200 | if (!rq_list_empty(iob.req_list)) |
3201 | iob.complete(&iob); | |
5eef4e87 PB |
3202 | else if (!pos) |
3203 | return 0; | |
def596e9 | 3204 | |
5eef4e87 PB |
3205 | prev = start; |
3206 | wq_list_for_each_resume(pos, prev) { | |
3207 | struct io_kiocb *req = container_of(pos, struct io_kiocb, comp_list); | |
3208 | ||
b3fa03fd PB |
3209 | /* order with io_complete_rw_iopoll(), e.g. ->result updates */ |
3210 | if (!smp_load_acquire(&req->iopoll_completed)) | |
e3f721e6 | 3211 | break; |
c0713540 | 3212 | nr_events++; |
83a13a41 PB |
3213 | if (unlikely(req->flags & REQ_F_CQE_SKIP)) |
3214 | continue; | |
cef216fc | 3215 | __io_fill_cqe_req(req, req->cqe.res, io_put_kbuf(req, 0)); |
e3f721e6 | 3216 | } |
def596e9 | 3217 | |
f5ed3bcd PB |
3218 | if (unlikely(!nr_events)) |
3219 | return 0; | |
3220 | ||
3221 | io_commit_cqring(ctx); | |
3222 | io_cqring_ev_posted_iopoll(ctx); | |
1cce17ac | 3223 | pos = start ? start->next : ctx->iopoll_list.first; |
5eef4e87 | 3224 | wq_list_cut(&ctx->iopoll_list, prev, start); |
1cce17ac | 3225 | io_free_batch_list(ctx, pos); |
5ba3c874 | 3226 | return nr_events; |
def596e9 JA |
3227 | } |
3228 | ||
def596e9 JA |
3229 | /* |
3230 | * We can't just wait for polled events to come to us, we have to actively | |
3231 | * find and complete them. | |
3232 | */ | |
c072481d | 3233 | static __cold void io_iopoll_try_reap_events(struct io_ring_ctx *ctx) |
def596e9 JA |
3234 | { |
3235 | if (!(ctx->flags & IORING_SETUP_IOPOLL)) | |
3236 | return; | |
3237 | ||
3238 | mutex_lock(&ctx->uring_lock); | |
5eef4e87 | 3239 | while (!wq_list_empty(&ctx->iopoll_list)) { |
b2edc0a7 | 3240 | /* let it sleep and repeat later if can't complete a request */ |
5ba3c874 | 3241 | if (io_do_iopoll(ctx, true) == 0) |
b2edc0a7 | 3242 | break; |
08f5439f JA |
3243 | /* |
3244 | * Ensure we allow local-to-the-cpu processing to take place, | |
3245 | * in this case we need to ensure that we reap all events. | |
3fcee5a6 | 3246 | * Also let task_work, etc. to progress by releasing the mutex |
08f5439f | 3247 | */ |
3fcee5a6 PB |
3248 | if (need_resched()) { |
3249 | mutex_unlock(&ctx->uring_lock); | |
3250 | cond_resched(); | |
3251 | mutex_lock(&ctx->uring_lock); | |
3252 | } | |
def596e9 JA |
3253 | } |
3254 | mutex_unlock(&ctx->uring_lock); | |
3255 | } | |
3256 | ||
7668b92a | 3257 | static int io_iopoll_check(struct io_ring_ctx *ctx, long min) |
def596e9 | 3258 | { |
7668b92a | 3259 | unsigned int nr_events = 0; |
e9979b36 | 3260 | int ret = 0; |
155bc950 | 3261 | unsigned long check_cq; |
500f9fba | 3262 | |
f39c8a5b PB |
3263 | /* |
3264 | * Don't enter poll loop if we already have events pending. | |
3265 | * If we do, we can potentially be spinning for commands that | |
3266 | * already triggered a CQE (eg in error). | |
3267 | */ | |
155bc950 DY |
3268 | check_cq = READ_ONCE(ctx->check_cq); |
3269 | if (check_cq & BIT(IO_CHECK_CQ_OVERFLOW_BIT)) | |
f39c8a5b PB |
3270 | __io_cqring_overflow_flush(ctx, false); |
3271 | if (io_cqring_events(ctx)) | |
d487b43c | 3272 | return 0; |
155bc950 DY |
3273 | |
3274 | /* | |
3275 | * Similarly do not spin if we have not informed the user of any | |
3276 | * dropped CQE. | |
3277 | */ | |
3278 | if (unlikely(check_cq & BIT(IO_CHECK_CQ_DROPPED_BIT))) | |
3279 | return -EBADR; | |
3280 | ||
def596e9 | 3281 | do { |
500f9fba JA |
3282 | /* |
3283 | * If a submit got punted to a workqueue, we can have the | |
3284 | * application entering polling for a command before it gets | |
3285 | * issued. That app will hold the uring_lock for the duration | |
3286 | * of the poll right here, so we need to take a breather every | |
3287 | * now and then to ensure that the issue has a chance to add | |
3288 | * the poll to the issued list. Otherwise we can spin here | |
3289 | * forever, while the workqueue is stuck trying to acquire the | |
3290 | * very same mutex. | |
3291 | */ | |
5eef4e87 | 3292 | if (wq_list_empty(&ctx->iopoll_list)) { |
8f487ef2 PB |
3293 | u32 tail = ctx->cached_cq_tail; |
3294 | ||
500f9fba | 3295 | mutex_unlock(&ctx->uring_lock); |
4c6e277c | 3296 | io_run_task_work(); |
500f9fba | 3297 | mutex_lock(&ctx->uring_lock); |
def596e9 | 3298 | |
8f487ef2 PB |
3299 | /* some requests don't go through iopoll_list */ |
3300 | if (tail != ctx->cached_cq_tail || | |
5eef4e87 | 3301 | wq_list_empty(&ctx->iopoll_list)) |
e9979b36 | 3302 | break; |
500f9fba | 3303 | } |
5ba3c874 PB |
3304 | ret = io_do_iopoll(ctx, !min); |
3305 | if (ret < 0) | |
3306 | break; | |
3307 | nr_events += ret; | |
3308 | ret = 0; | |
3309 | } while (nr_events < min && !need_resched()); | |
d487b43c | 3310 | |
def596e9 JA |
3311 | return ret; |
3312 | } | |
3313 | ||
491381ce | 3314 | static void kiocb_end_write(struct io_kiocb *req) |
2b188cc1 | 3315 | { |
491381ce JA |
3316 | /* |
3317 | * Tell lockdep we inherited freeze protection from submission | |
3318 | * thread. | |
3319 | */ | |
3320 | if (req->flags & REQ_F_ISREG) { | |
1c98679d | 3321 | struct super_block *sb = file_inode(req->file)->i_sb; |
2b188cc1 | 3322 | |
1c98679d PB |
3323 | __sb_writers_acquired(sb, SB_FREEZE_WRITE); |
3324 | sb_end_write(sb); | |
2b188cc1 JA |
3325 | } |
3326 | } | |
3327 | ||
b63534c4 | 3328 | #ifdef CONFIG_BLOCK |
dc2a6e9a | 3329 | static bool io_resubmit_prep(struct io_kiocb *req) |
b63534c4 | 3330 | { |
ab454438 | 3331 | struct io_async_rw *rw = req->async_data; |
b63534c4 | 3332 | |
d886e185 | 3333 | if (!req_has_async_data(req)) |
ab454438 | 3334 | return !io_req_prep_async(req); |
538941e2 | 3335 | iov_iter_restore(&rw->s.iter, &rw->s.iter_state); |
ab454438 | 3336 | return true; |
b63534c4 | 3337 | } |
b63534c4 | 3338 | |
3e6a0d3c | 3339 | static bool io_rw_should_reissue(struct io_kiocb *req) |
b63534c4 | 3340 | { |
355afaeb | 3341 | umode_t mode = file_inode(req->file)->i_mode; |
3e6a0d3c | 3342 | struct io_ring_ctx *ctx = req->ctx; |
b63534c4 | 3343 | |
355afaeb JA |
3344 | if (!S_ISBLK(mode) && !S_ISREG(mode)) |
3345 | return false; | |
3e6a0d3c JA |
3346 | if ((req->flags & REQ_F_NOWAIT) || (io_wq_current_is_worker() && |
3347 | !(ctx->flags & IORING_SETUP_IOPOLL))) | |
b63534c4 | 3348 | return false; |
7c977a58 JA |
3349 | /* |
3350 | * If ref is dying, we might be running poll reap from the exit work. | |
3351 | * Don't attempt to reissue from that path, just let it fail with | |
3352 | * -EAGAIN. | |
3353 | */ | |
3e6a0d3c JA |
3354 | if (percpu_ref_is_dying(&ctx->refs)) |
3355 | return false; | |
ef046888 JA |
3356 | /* |
3357 | * Play it safe and assume not safe to re-import and reissue if we're | |
3358 | * not in the original thread group (or in task context). | |
3359 | */ | |
3360 | if (!same_thread_group(req->task, current) || !in_task()) | |
3361 | return false; | |
3e6a0d3c JA |
3362 | return true; |
3363 | } | |
e82ad485 | 3364 | #else |
a1ff1e3f | 3365 | static bool io_resubmit_prep(struct io_kiocb *req) |
e82ad485 JA |
3366 | { |
3367 | return false; | |
3368 | } | |
e82ad485 | 3369 | static bool io_rw_should_reissue(struct io_kiocb *req) |
3e6a0d3c | 3370 | { |
b63534c4 JA |
3371 | return false; |
3372 | } | |
3e6a0d3c | 3373 | #endif |
b63534c4 | 3374 | |
8ef12efe | 3375 | static bool __io_complete_rw_common(struct io_kiocb *req, long res) |
a1d7c393 | 3376 | { |
f63cf519 | 3377 | if (req->rw.kiocb.ki_flags & IOCB_WRITE) { |
b65c128f | 3378 | kiocb_end_write(req); |
f63cf519 JA |
3379 | fsnotify_modify(req->file); |
3380 | } else { | |
3381 | fsnotify_access(req->file); | |
3382 | } | |
cef216fc | 3383 | if (unlikely(res != req->cqe.res)) { |
9532b99b PB |
3384 | if ((res == -EAGAIN || res == -EOPNOTSUPP) && |
3385 | io_rw_should_reissue(req)) { | |
3386 | req->flags |= REQ_F_REISSUE; | |
8ef12efe | 3387 | return true; |
9532b99b | 3388 | } |
93d2bcd2 | 3389 | req_set_fail(req); |
cef216fc | 3390 | req->cqe.res = res; |
9532b99b | 3391 | } |
8ef12efe JA |
3392 | return false; |
3393 | } | |
3394 | ||
cc8e9ba7 | 3395 | static inline void io_req_task_complete(struct io_kiocb *req, bool *locked) |
8ef12efe | 3396 | { |
cef216fc | 3397 | int res = req->cqe.res; |
126180b9 PB |
3398 | |
3399 | if (*locked) { | |
cc3cec83 | 3400 | io_req_complete_state(req, res, io_put_kbuf(req, 0)); |
fff4e40e | 3401 | io_req_add_compl_list(req); |
126180b9 | 3402 | } else { |
cc3cec83 JA |
3403 | io_req_complete_post(req, res, |
3404 | io_put_kbuf(req, IO_URING_F_UNLOCKED)); | |
126180b9 | 3405 | } |
8ef12efe JA |
3406 | } |
3407 | ||
00f6e68b | 3408 | static void __io_complete_rw(struct io_kiocb *req, long res, |
8ef12efe JA |
3409 | unsigned int issue_flags) |
3410 | { | |
3411 | if (__io_complete_rw_common(req, res)) | |
3412 | return; | |
cef216fc | 3413 | __io_req_complete(req, issue_flags, req->cqe.res, |
cc3cec83 | 3414 | io_put_kbuf(req, issue_flags)); |
ba816ad6 JA |
3415 | } |
3416 | ||
6b19b766 | 3417 | static void io_complete_rw(struct kiocb *kiocb, long res) |
ba816ad6 | 3418 | { |
9adbd45d | 3419 | struct io_kiocb *req = container_of(kiocb, struct io_kiocb, rw.kiocb); |
ba816ad6 | 3420 | |
8ef12efe JA |
3421 | if (__io_complete_rw_common(req, res)) |
3422 | return; | |
cef216fc | 3423 | req->cqe.res = res; |
8ef12efe | 3424 | req->io_task_work.func = io_req_task_complete; |
f28c240e | 3425 | io_req_task_work_add(req, !!(req->ctx->flags & IORING_SETUP_SQPOLL)); |
2b188cc1 JA |
3426 | } |
3427 | ||
6b19b766 | 3428 | static void io_complete_rw_iopoll(struct kiocb *kiocb, long res) |
def596e9 | 3429 | { |
9adbd45d | 3430 | struct io_kiocb *req = container_of(kiocb, struct io_kiocb, rw.kiocb); |
def596e9 | 3431 | |
491381ce JA |
3432 | if (kiocb->ki_flags & IOCB_WRITE) |
3433 | kiocb_end_write(req); | |
cef216fc | 3434 | if (unlikely(res != req->cqe.res)) { |
b66ceaf3 PB |
3435 | if (res == -EAGAIN && io_rw_should_reissue(req)) { |
3436 | req->flags |= REQ_F_REISSUE; | |
3437 | return; | |
9532b99b | 3438 | } |
cef216fc | 3439 | req->cqe.res = res; |
8c130827 | 3440 | } |
bbde017a | 3441 | |
b3fa03fd PB |
3442 | /* order with io_iopoll_complete() checking ->iopoll_completed */ |
3443 | smp_store_release(&req->iopoll_completed, 1); | |
def596e9 JA |
3444 | } |
3445 | ||
3446 | /* | |
3447 | * After the iocb has been issued, it's safe to be found on the poll list. | |
3448 | * Adding the kiocb to the list AFTER submission ensures that we don't | |
f39c8a5b | 3449 | * find it from a io_do_iopoll() thread before the issuer is done |
def596e9 JA |
3450 | * accessing the kiocb cookie. |
3451 | */ | |
9882131c | 3452 | static void io_iopoll_req_issued(struct io_kiocb *req, unsigned int issue_flags) |
def596e9 JA |
3453 | { |
3454 | struct io_ring_ctx *ctx = req->ctx; | |
3b44b371 | 3455 | const bool needs_lock = issue_flags & IO_URING_F_UNLOCKED; |
cb3d8972 PB |
3456 | |
3457 | /* workqueue context doesn't hold uring_lock, grab it now */ | |
3b44b371 | 3458 | if (unlikely(needs_lock)) |
cb3d8972 | 3459 | mutex_lock(&ctx->uring_lock); |
def596e9 JA |
3460 | |
3461 | /* | |
3462 | * Track whether we have multiple files in our lists. This will impact | |
3463 | * how we do polling eventually, not spinning if we're on potentially | |
3464 | * different devices. | |
3465 | */ | |
5eef4e87 | 3466 | if (wq_list_empty(&ctx->iopoll_list)) { |
915b3dde HX |
3467 | ctx->poll_multi_queue = false; |
3468 | } else if (!ctx->poll_multi_queue) { | |
def596e9 JA |
3469 | struct io_kiocb *list_req; |
3470 | ||
5eef4e87 PB |
3471 | list_req = container_of(ctx->iopoll_list.first, struct io_kiocb, |
3472 | comp_list); | |
30da1b45 | 3473 | if (list_req->file != req->file) |
915b3dde | 3474 | ctx->poll_multi_queue = true; |
def596e9 JA |
3475 | } |
3476 | ||
3477 | /* | |
3478 | * For fast devices, IO may have already completed. If it has, add | |
3479 | * it to the front so we find it first. | |
3480 | */ | |
65a6543d | 3481 | if (READ_ONCE(req->iopoll_completed)) |
5eef4e87 | 3482 | wq_list_add_head(&req->comp_list, &ctx->iopoll_list); |
def596e9 | 3483 | else |
5eef4e87 | 3484 | wq_list_add_tail(&req->comp_list, &ctx->iopoll_list); |
bdcd3eab | 3485 | |
3b44b371 | 3486 | if (unlikely(needs_lock)) { |
cb3d8972 PB |
3487 | /* |
3488 | * If IORING_SETUP_SQPOLL is enabled, sqes are either handle | |
3489 | * in sq thread task context or in io worker task context. If | |
3490 | * current task context is sq thread, we don't need to check | |
3491 | * whether should wake up sq thread. | |
3492 | */ | |
3493 | if ((ctx->flags & IORING_SETUP_SQPOLL) && | |
3494 | wq_has_sleeper(&ctx->sq_data->wait)) | |
3495 | wake_up(&ctx->sq_data->wait); | |
3496 | ||
3497 | mutex_unlock(&ctx->uring_lock); | |
3498 | } | |
def596e9 JA |
3499 | } |
3500 | ||
4503b767 JA |
3501 | static bool io_bdev_nowait(struct block_device *bdev) |
3502 | { | |
9ba0d0c8 | 3503 | return !bdev || blk_queue_nowait(bdev_get_queue(bdev)); |
4503b767 JA |
3504 | } |
3505 | ||
2b188cc1 JA |
3506 | /* |
3507 | * If we tracked the file through the SCM inflight mechanism, we could support | |
3508 | * any file. For now, just ensure that anything potentially problematic is done | |
3509 | * inline. | |
3510 | */ | |
88459b50 | 3511 | static bool __io_file_supports_nowait(struct file *file, umode_t mode) |
2b188cc1 | 3512 | { |
4503b767 | 3513 | if (S_ISBLK(mode)) { |
4e7b5671 CH |
3514 | if (IS_ENABLED(CONFIG_BLOCK) && |
3515 | io_bdev_nowait(I_BDEV(file->f_mapping->host))) | |
4503b767 JA |
3516 | return true; |
3517 | return false; | |
3518 | } | |
976517f1 | 3519 | if (S_ISSOCK(mode)) |
2b188cc1 | 3520 | return true; |
4503b767 | 3521 | if (S_ISREG(mode)) { |
4e7b5671 CH |
3522 | if (IS_ENABLED(CONFIG_BLOCK) && |
3523 | io_bdev_nowait(file->f_inode->i_sb->s_bdev) && | |
4503b767 JA |
3524 | file->f_op != &io_uring_fops) |
3525 | return true; | |
3526 | return false; | |
3527 | } | |
2b188cc1 | 3528 | |
c5b85625 JA |
3529 | /* any ->read/write should understand O_NONBLOCK */ |
3530 | if (file->f_flags & O_NONBLOCK) | |
3531 | return true; | |
35645ac3 | 3532 | return file->f_mode & FMODE_NOWAIT; |
2b188cc1 | 3533 | } |
c5b85625 | 3534 | |
88459b50 PB |
3535 | /* |
3536 | * If we tracked the file through the SCM inflight mechanism, we could support | |
3537 | * any file. For now, just ensure that anything potentially problematic is done | |
3538 | * inline. | |
3539 | */ | |
3540 | static unsigned int io_file_get_flags(struct file *file) | |
3541 | { | |
3542 | umode_t mode = file_inode(file)->i_mode; | |
3543 | unsigned int res = 0; | |
af197f50 | 3544 | |
88459b50 PB |
3545 | if (S_ISREG(mode)) |
3546 | res |= FFS_ISREG; | |
3547 | if (__io_file_supports_nowait(file, mode)) | |
3548 | res |= FFS_NOWAIT; | |
5e45690a JA |
3549 | if (io_file_need_scm(file)) |
3550 | res |= FFS_SCM; | |
88459b50 | 3551 | return res; |
2b188cc1 JA |
3552 | } |
3553 | ||
35645ac3 | 3554 | static inline bool io_file_supports_nowait(struct io_kiocb *req) |
7b29f92d | 3555 | { |
88459b50 | 3556 | return req->flags & REQ_F_SUPPORT_NOWAIT; |
7b29f92d JA |
3557 | } |
3558 | ||
b9a6b8f9 | 3559 | static int io_prep_rw(struct io_kiocb *req, const struct io_uring_sqe *sqe) |
2b188cc1 | 3560 | { |
9adbd45d | 3561 | struct kiocb *kiocb = &req->rw.kiocb; |
09bb8394 JA |
3562 | unsigned ioprio; |
3563 | int ret; | |
2b188cc1 | 3564 | |
2b188cc1 | 3565 | kiocb->ki_pos = READ_ONCE(sqe->off); |
9adbd45d | 3566 | |
fb27274a PB |
3567 | ioprio = READ_ONCE(sqe->ioprio); |
3568 | if (ioprio) { | |
3569 | ret = ioprio_check_cap(ioprio); | |
3570 | if (ret) | |
3571 | return ret; | |
3572 | ||
3573 | kiocb->ki_ioprio = ioprio; | |
3574 | } else { | |
3575 | kiocb->ki_ioprio = get_current_ioprio(); | |
eae071c9 PB |
3576 | } |
3577 | ||
578c0ee2 | 3578 | req->imu = NULL; |
3529d8c2 JA |
3579 | req->rw.addr = READ_ONCE(sqe->addr); |
3580 | req->rw.len = READ_ONCE(sqe->len); | |
584b0180 | 3581 | req->rw.flags = READ_ONCE(sqe->rw_flags); |
4e906702 | 3582 | /* used for fixed read/write too - just read unconditionally */ |
4f4eeba8 | 3583 | req->buf_index = READ_ONCE(sqe->buf_index); |
2b188cc1 | 3584 | return 0; |
2b188cc1 JA |
3585 | } |
3586 | ||
3587 | static inline void io_rw_done(struct kiocb *kiocb, ssize_t ret) | |
3588 | { | |
3589 | switch (ret) { | |
3590 | case -EIOCBQUEUED: | |
3591 | break; | |
3592 | case -ERESTARTSYS: | |
3593 | case -ERESTARTNOINTR: | |
3594 | case -ERESTARTNOHAND: | |
3595 | case -ERESTART_RESTARTBLOCK: | |
3596 | /* | |
3597 | * We can't just restart the syscall, since previously | |
3598 | * submitted sqes may already be in progress. Just fail this | |
3599 | * IO with EINTR. | |
3600 | */ | |
3601 | ret = -EINTR; | |
df561f66 | 3602 | fallthrough; |
2b188cc1 | 3603 | default: |
6b19b766 | 3604 | kiocb->ki_complete(kiocb, ret); |
2b188cc1 JA |
3605 | } |
3606 | } | |
3607 | ||
b4aec400 | 3608 | static inline loff_t *io_kiocb_update_pos(struct io_kiocb *req) |
d34e1e5b DY |
3609 | { |
3610 | struct kiocb *kiocb = &req->rw.kiocb; | |
3611 | ||
6f83ab22 JA |
3612 | if (kiocb->ki_pos != -1) |
3613 | return &kiocb->ki_pos; | |
3614 | ||
3615 | if (!(req->file->f_mode & FMODE_STREAM)) { | |
3616 | req->flags |= REQ_F_CUR_POS; | |
3617 | kiocb->ki_pos = req->file->f_pos; | |
3618 | return &kiocb->ki_pos; | |
d34e1e5b | 3619 | } |
6f83ab22 JA |
3620 | |
3621 | kiocb->ki_pos = 0; | |
3622 | return NULL; | |
d34e1e5b DY |
3623 | } |
3624 | ||
2ea537ca | 3625 | static void kiocb_done(struct io_kiocb *req, ssize_t ret, |
889fca73 | 3626 | unsigned int issue_flags) |
ba816ad6 | 3627 | { |
e8c2bc1f | 3628 | struct io_async_rw *io = req->async_data; |
ba04291e | 3629 | |
227c0c96 | 3630 | /* add previously done IO, if any */ |
d886e185 | 3631 | if (req_has_async_data(req) && io->bytes_done > 0) { |
227c0c96 | 3632 | if (ret < 0) |
e8c2bc1f | 3633 | ret = io->bytes_done; |
227c0c96 | 3634 | else |
e8c2bc1f | 3635 | ret += io->bytes_done; |
227c0c96 JA |
3636 | } |
3637 | ||
ba04291e | 3638 | if (req->flags & REQ_F_CUR_POS) |
2ea537ca PB |
3639 | req->file->f_pos = req->rw.kiocb.ki_pos; |
3640 | if (ret >= 0 && (req->rw.kiocb.ki_complete == io_complete_rw)) | |
00f6e68b | 3641 | __io_complete_rw(req, ret, issue_flags); |
ba816ad6 | 3642 | else |
2ea537ca | 3643 | io_rw_done(&req->rw.kiocb, ret); |
97284637 | 3644 | |
b66ceaf3 | 3645 | if (req->flags & REQ_F_REISSUE) { |
97284637 | 3646 | req->flags &= ~REQ_F_REISSUE; |
b91ef187 | 3647 | if (io_resubmit_prep(req)) |
773af691 | 3648 | io_req_task_queue_reissue(req); |
b91ef187 PB |
3649 | else |
3650 | io_req_task_queue_fail(req, ret); | |
97284637 | 3651 | } |
ba816ad6 JA |
3652 | } |
3653 | ||
eae071c9 PB |
3654 | static int __io_import_fixed(struct io_kiocb *req, int rw, struct iov_iter *iter, |
3655 | struct io_mapped_ubuf *imu) | |
edafccee | 3656 | { |
9adbd45d | 3657 | size_t len = req->rw.len; |
75769e3f | 3658 | u64 buf_end, buf_addr = req->rw.addr; |
edafccee | 3659 | size_t offset; |
edafccee | 3660 | |
75769e3f | 3661 | if (unlikely(check_add_overflow(buf_addr, (u64)len, &buf_end))) |
edafccee JA |
3662 | return -EFAULT; |
3663 | /* not inside the mapped region */ | |
4751f53d | 3664 | if (unlikely(buf_addr < imu->ubuf || buf_end > imu->ubuf_end)) |
edafccee JA |
3665 | return -EFAULT; |
3666 | ||
3667 | /* | |
3668 | * May not be a start of buffer, set size appropriately | |
3669 | * and advance us to the beginning. | |
3670 | */ | |
3671 | offset = buf_addr - imu->ubuf; | |
3672 | iov_iter_bvec(iter, rw, imu->bvec, imu->nr_bvecs, offset + len); | |
bd11b3a3 JA |
3673 | |
3674 | if (offset) { | |
3675 | /* | |
3676 | * Don't use iov_iter_advance() here, as it's really slow for | |
3677 | * using the latter parts of a big fixed buffer - it iterates | |
3678 | * over each segment manually. We can cheat a bit here, because | |
3679 | * we know that: | |
3680 | * | |
3681 | * 1) it's a BVEC iter, we set it up | |
3682 | * 2) all bvecs are PAGE_SIZE in size, except potentially the | |
3683 | * first and last bvec | |
3684 | * | |
3685 | * So just find our index, and adjust the iterator afterwards. | |
3686 | * If the offset is within the first bvec (or the whole first | |
3687 | * bvec, just use iov_iter_advance(). This makes it easier | |
3688 | * since we can just skip the first segment, which may not | |
3689 | * be PAGE_SIZE aligned. | |
3690 | */ | |
3691 | const struct bio_vec *bvec = imu->bvec; | |
3692 | ||
3693 | if (offset <= bvec->bv_len) { | |
3694 | iov_iter_advance(iter, offset); | |
3695 | } else { | |
3696 | unsigned long seg_skip; | |
3697 | ||
3698 | /* skip first vec */ | |
3699 | offset -= bvec->bv_len; | |
3700 | seg_skip = 1 + (offset >> PAGE_SHIFT); | |
3701 | ||
3702 | iter->bvec = bvec + seg_skip; | |
3703 | iter->nr_segs -= seg_skip; | |
99c79f66 | 3704 | iter->count -= bvec->bv_len + offset; |
bd11b3a3 | 3705 | iter->iov_offset = offset & ~PAGE_MASK; |
bd11b3a3 JA |
3706 | } |
3707 | } | |
3708 | ||
847595de | 3709 | return 0; |
edafccee JA |
3710 | } |
3711 | ||
5106dd6e JA |
3712 | static int io_import_fixed(struct io_kiocb *req, int rw, struct iov_iter *iter, |
3713 | unsigned int issue_flags) | |
eae071c9 | 3714 | { |
eae071c9 PB |
3715 | struct io_mapped_ubuf *imu = req->imu; |
3716 | u16 index, buf_index = req->buf_index; | |
3717 | ||
3718 | if (likely(!imu)) { | |
578c0ee2 PB |
3719 | struct io_ring_ctx *ctx = req->ctx; |
3720 | ||
eae071c9 PB |
3721 | if (unlikely(buf_index >= ctx->nr_user_bufs)) |
3722 | return -EFAULT; | |
5106dd6e | 3723 | io_req_set_rsrc_node(req, ctx, issue_flags); |
eae071c9 PB |
3724 | index = array_index_nospec(buf_index, ctx->nr_user_bufs); |
3725 | imu = READ_ONCE(ctx->user_bufs[index]); | |
3726 | req->imu = imu; | |
3727 | } | |
3728 | return __io_import_fixed(req, rw, iter, imu); | |
3729 | } | |
3730 | ||
9cfc7e94 JA |
3731 | static int io_buffer_add_list(struct io_ring_ctx *ctx, |
3732 | struct io_buffer_list *bl, unsigned int bgid) | |
bcda7baa | 3733 | { |
dbc7d452 | 3734 | bl->bgid = bgid; |
9cfc7e94 JA |
3735 | if (bgid < BGID_ARRAY) |
3736 | return 0; | |
bcda7baa | 3737 | |
9cfc7e94 | 3738 | return xa_err(xa_store(&ctx->io_bl_xa, bgid, bl, GFP_KERNEL)); |
bcda7baa JA |
3739 | } |
3740 | ||
149c69b0 JA |
3741 | static void __user *io_provided_buffer_select(struct io_kiocb *req, size_t *len, |
3742 | struct io_buffer_list *bl, | |
3743 | unsigned int issue_flags) | |
dbc7d452 | 3744 | { |
149c69b0 | 3745 | struct io_buffer *kbuf; |
dbc7d452 | 3746 | |
149c69b0 JA |
3747 | if (list_empty(&bl->buf_list)) |
3748 | return ERR_PTR(-ENOBUFS); | |
3749 | ||
3750 | kbuf = list_first_entry(&bl->buf_list, struct io_buffer, list); | |
3751 | list_del(&kbuf->list); | |
3752 | if (*len > kbuf->len) | |
3753 | *len = kbuf->len; | |
3754 | req->flags |= REQ_F_BUFFER_SELECTED; | |
3755 | req->kbuf = kbuf; | |
1dbd023e | 3756 | req->buf_index = kbuf->bid; |
149c69b0 JA |
3757 | io_ring_submit_unlock(req->ctx, issue_flags); |
3758 | return u64_to_user_ptr(kbuf->addr); | |
dbc7d452 JA |
3759 | } |
3760 | ||
c54d52c2 | 3761 | static void __user *io_buffer_select(struct io_kiocb *req, size_t *len, |
4e906702 | 3762 | unsigned int issue_flags) |
bcda7baa | 3763 | { |
dbc7d452 JA |
3764 | struct io_ring_ctx *ctx = req->ctx; |
3765 | struct io_buffer_list *bl; | |
bcda7baa | 3766 | |
f8929630 | 3767 | io_ring_submit_lock(req->ctx, issue_flags); |
bcda7baa | 3768 | |
4e906702 | 3769 | bl = io_buffer_get_list(ctx, req->buf_index); |
149c69b0 | 3770 | if (unlikely(!bl)) { |
c54d52c2 | 3771 | io_ring_submit_unlock(req->ctx, issue_flags); |
149c69b0 | 3772 | return ERR_PTR(-ENOBUFS); |
bcda7baa JA |
3773 | } |
3774 | ||
149c69b0 JA |
3775 | /* selection helpers drop the submit lock again, if needed */ |
3776 | return io_provided_buffer_select(req, len, bl, issue_flags); | |
4d954c25 JA |
3777 | } |
3778 | ||
3779 | #ifdef CONFIG_COMPAT | |
3780 | static ssize_t io_compat_import(struct io_kiocb *req, struct iovec *iov, | |
51aac424 | 3781 | unsigned int issue_flags) |
4d954c25 JA |
3782 | { |
3783 | struct compat_iovec __user *uiov; | |
3784 | compat_ssize_t clen; | |
3785 | void __user *buf; | |
e5b00349 | 3786 | size_t len; |
4d954c25 JA |
3787 | |
3788 | uiov = u64_to_user_ptr(req->rw.addr); | |
3789 | if (!access_ok(uiov, sizeof(*uiov))) | |
3790 | return -EFAULT; | |
3791 | if (__get_user(clen, &uiov->iov_len)) | |
3792 | return -EFAULT; | |
3793 | if (clen < 0) | |
3794 | return -EINVAL; | |
3795 | ||
3796 | len = clen; | |
4e906702 | 3797 | buf = io_buffer_select(req, &len, issue_flags); |
4d954c25 JA |
3798 | if (IS_ERR(buf)) |
3799 | return PTR_ERR(buf); | |
b66e65f4 | 3800 | req->rw.addr = (unsigned long) buf; |
4d954c25 | 3801 | iov[0].iov_base = buf; |
b66e65f4 | 3802 | req->rw.len = iov[0].iov_len = (compat_size_t) len; |
4d954c25 JA |
3803 | return 0; |
3804 | } | |
3805 | #endif | |
3806 | ||
3807 | static ssize_t __io_iov_buffer_select(struct io_kiocb *req, struct iovec *iov, | |
51aac424 | 3808 | unsigned int issue_flags) |
4d954c25 JA |
3809 | { |
3810 | struct iovec __user *uiov = u64_to_user_ptr(req->rw.addr); | |
3811 | void __user *buf; | |
3812 | ssize_t len; | |
3813 | ||
3814 | if (copy_from_user(iov, uiov, sizeof(*uiov))) | |
3815 | return -EFAULT; | |
3816 | ||
3817 | len = iov[0].iov_len; | |
3818 | if (len < 0) | |
3819 | return -EINVAL; | |
4e906702 | 3820 | buf = io_buffer_select(req, &len, issue_flags); |
4d954c25 JA |
3821 | if (IS_ERR(buf)) |
3822 | return PTR_ERR(buf); | |
b66e65f4 | 3823 | req->rw.addr = (unsigned long) buf; |
4d954c25 | 3824 | iov[0].iov_base = buf; |
b66e65f4 | 3825 | req->rw.len = iov[0].iov_len = len; |
4d954c25 JA |
3826 | return 0; |
3827 | } | |
3828 | ||
3829 | static ssize_t io_iov_buffer_select(struct io_kiocb *req, struct iovec *iov, | |
51aac424 | 3830 | unsigned int issue_flags) |
4d954c25 | 3831 | { |
dddb3e26 | 3832 | if (req->flags & REQ_F_BUFFER_SELECTED) { |
b66e65f4 JA |
3833 | iov[0].iov_base = u64_to_user_ptr(req->rw.addr); |
3834 | iov[0].iov_len = req->rw.len; | |
4d954c25 | 3835 | return 0; |
dddb3e26 | 3836 | } |
dd201662 | 3837 | if (req->rw.len != 1) |
4d954c25 JA |
3838 | return -EINVAL; |
3839 | ||
3840 | #ifdef CONFIG_COMPAT | |
3841 | if (req->ctx->compat) | |
51aac424 | 3842 | return io_compat_import(req, iov, issue_flags); |
4d954c25 JA |
3843 | #endif |
3844 | ||
51aac424 | 3845 | return __io_iov_buffer_select(req, iov, issue_flags); |
4d954c25 JA |
3846 | } |
3847 | ||
b66e65f4 JA |
3848 | static inline bool io_do_buffer_select(struct io_kiocb *req) |
3849 | { | |
3850 | if (!(req->flags & REQ_F_BUFFER_SELECT)) | |
3851 | return false; | |
3852 | return !(req->flags & REQ_F_BUFFER_SELECTED); | |
3853 | } | |
3854 | ||
caa8fe6e PB |
3855 | static struct iovec *__io_import_iovec(int rw, struct io_kiocb *req, |
3856 | struct io_rw_state *s, | |
3857 | unsigned int issue_flags) | |
2b188cc1 | 3858 | { |
5e49c973 | 3859 | struct iov_iter *iter = &s->iter; |
847595de | 3860 | u8 opcode = req->opcode; |
caa8fe6e | 3861 | struct iovec *iovec; |
d1d681b0 PB |
3862 | void __user *buf; |
3863 | size_t sqe_len; | |
4d954c25 | 3864 | ssize_t ret; |
edafccee | 3865 | |
f3251183 | 3866 | if (opcode == IORING_OP_READ_FIXED || opcode == IORING_OP_WRITE_FIXED) { |
5106dd6e | 3867 | ret = io_import_fixed(req, rw, iter, issue_flags); |
f3251183 PB |
3868 | if (ret) |
3869 | return ERR_PTR(ret); | |
3870 | return NULL; | |
3871 | } | |
2b188cc1 | 3872 | |
d1d681b0 PB |
3873 | buf = u64_to_user_ptr(req->rw.addr); |
3874 | sqe_len = req->rw.len; | |
9adbd45d | 3875 | |
3a6820f2 | 3876 | if (opcode == IORING_OP_READ || opcode == IORING_OP_WRITE) { |
b66e65f4 | 3877 | if (io_do_buffer_select(req)) { |
4e906702 | 3878 | buf = io_buffer_select(req, &sqe_len, issue_flags); |
867a23ea | 3879 | if (IS_ERR(buf)) |
898df244 | 3880 | return ERR_CAST(buf); |
b66e65f4 | 3881 | req->rw.addr = (unsigned long) buf; |
3f9d6441 | 3882 | req->rw.len = sqe_len; |
bcda7baa JA |
3883 | } |
3884 | ||
5e49c973 | 3885 | ret = import_single_range(rw, buf, sqe_len, s->fast_iov, iter); |
f3251183 PB |
3886 | if (ret) |
3887 | return ERR_PTR(ret); | |
3888 | return NULL; | |
3a6820f2 JA |
3889 | } |
3890 | ||
caa8fe6e | 3891 | iovec = s->fast_iov; |
4d954c25 | 3892 | if (req->flags & REQ_F_BUFFER_SELECT) { |
caa8fe6e | 3893 | ret = io_iov_buffer_select(req, iovec, issue_flags); |
f3251183 PB |
3894 | if (ret) |
3895 | return ERR_PTR(ret); | |
3896 | iov_iter_init(iter, rw, iovec, 1, iovec->iov_len); | |
3897 | return NULL; | |
4d954c25 JA |
3898 | } |
3899 | ||
caa8fe6e | 3900 | ret = __import_iovec(rw, buf, sqe_len, UIO_FASTIOV, &iovec, iter, |
89cd35c5 | 3901 | req->ctx->compat); |
caa8fe6e PB |
3902 | if (unlikely(ret < 0)) |
3903 | return ERR_PTR(ret); | |
3904 | return iovec; | |
2b188cc1 JA |
3905 | } |
3906 | ||
5e49c973 PB |
3907 | static inline int io_import_iovec(int rw, struct io_kiocb *req, |
3908 | struct iovec **iovec, struct io_rw_state *s, | |
3909 | unsigned int issue_flags) | |
3910 | { | |
caa8fe6e PB |
3911 | *iovec = __io_import_iovec(rw, req, s, issue_flags); |
3912 | if (unlikely(IS_ERR(*iovec))) | |
3913 | return PTR_ERR(*iovec); | |
5e49c973 | 3914 | |
5e49c973 | 3915 | iov_iter_save_state(&s->iter, &s->iter_state); |
caa8fe6e | 3916 | return 0; |
2b188cc1 JA |
3917 | } |
3918 | ||
0fef9483 JA |
3919 | static inline loff_t *io_kiocb_ppos(struct kiocb *kiocb) |
3920 | { | |
5b09e37e | 3921 | return (kiocb->ki_filp->f_mode & FMODE_STREAM) ? NULL : &kiocb->ki_pos; |
0fef9483 JA |
3922 | } |
3923 | ||
31b51510 | 3924 | /* |
32960613 JA |
3925 | * For files that don't have ->read_iter() and ->write_iter(), handle them |
3926 | * by looping over ->read() or ->write() manually. | |
31b51510 | 3927 | */ |
4017eb91 | 3928 | static ssize_t loop_rw_iter(int rw, struct io_kiocb *req, struct iov_iter *iter) |
32960613 | 3929 | { |
4017eb91 JA |
3930 | struct kiocb *kiocb = &req->rw.kiocb; |
3931 | struct file *file = req->file; | |
32960613 | 3932 | ssize_t ret = 0; |
af9c45ec | 3933 | loff_t *ppos; |
32960613 JA |
3934 | |
3935 | /* | |
3936 | * Don't support polled IO through this interface, and we can't | |
3937 | * support non-blocking either. For the latter, this just causes | |
3938 | * the kiocb to be handled from an async context. | |
3939 | */ | |
3940 | if (kiocb->ki_flags & IOCB_HIPRI) | |
3941 | return -EOPNOTSUPP; | |
35645ac3 PB |
3942 | if ((kiocb->ki_flags & IOCB_NOWAIT) && |
3943 | !(kiocb->ki_filp->f_flags & O_NONBLOCK)) | |
32960613 JA |
3944 | return -EAGAIN; |
3945 | ||
af9c45ec DY |
3946 | ppos = io_kiocb_ppos(kiocb); |
3947 | ||
32960613 | 3948 | while (iov_iter_count(iter)) { |
311ae9e1 | 3949 | struct iovec iovec; |
32960613 JA |
3950 | ssize_t nr; |
3951 | ||
311ae9e1 PB |
3952 | if (!iov_iter_is_bvec(iter)) { |
3953 | iovec = iov_iter_iovec(iter); | |
3954 | } else { | |
4017eb91 JA |
3955 | iovec.iov_base = u64_to_user_ptr(req->rw.addr); |
3956 | iovec.iov_len = req->rw.len; | |
311ae9e1 PB |
3957 | } |
3958 | ||
32960613 JA |
3959 | if (rw == READ) { |
3960 | nr = file->f_op->read(file, iovec.iov_base, | |
af9c45ec | 3961 | iovec.iov_len, ppos); |
32960613 JA |
3962 | } else { |
3963 | nr = file->f_op->write(file, iovec.iov_base, | |
af9c45ec | 3964 | iovec.iov_len, ppos); |
32960613 JA |
3965 | } |
3966 | ||
3967 | if (nr < 0) { | |
3968 | if (!ret) | |
3969 | ret = nr; | |
3970 | break; | |
3971 | } | |
5e929367 | 3972 | ret += nr; |
16c8d2df JA |
3973 | if (!iov_iter_is_bvec(iter)) { |
3974 | iov_iter_advance(iter, nr); | |
3975 | } else { | |
16c8d2df | 3976 | req->rw.addr += nr; |
5e929367 JA |
3977 | req->rw.len -= nr; |
3978 | if (!req->rw.len) | |
3979 | break; | |
16c8d2df | 3980 | } |
32960613 JA |
3981 | if (nr != iovec.iov_len) |
3982 | break; | |
32960613 JA |
3983 | } |
3984 | ||
3985 | return ret; | |
3986 | } | |
3987 | ||
ff6165b2 JA |
3988 | static void io_req_map_rw(struct io_kiocb *req, const struct iovec *iovec, |
3989 | const struct iovec *fast_iov, struct iov_iter *iter) | |
f67676d1 | 3990 | { |
e8c2bc1f | 3991 | struct io_async_rw *rw = req->async_data; |
b64e3444 | 3992 | |
538941e2 | 3993 | memcpy(&rw->s.iter, iter, sizeof(*iter)); |
afb87658 | 3994 | rw->free_iovec = iovec; |
227c0c96 | 3995 | rw->bytes_done = 0; |
ff6165b2 | 3996 | /* can only be fixed buffers, no need to do anything */ |
9c3a205c | 3997 | if (iov_iter_is_bvec(iter)) |
ff6165b2 | 3998 | return; |
b64e3444 | 3999 | if (!iovec) { |
ff6165b2 JA |
4000 | unsigned iov_off = 0; |
4001 | ||
538941e2 | 4002 | rw->s.iter.iov = rw->s.fast_iov; |
ff6165b2 JA |
4003 | if (iter->iov != fast_iov) { |
4004 | iov_off = iter->iov - fast_iov; | |
538941e2 | 4005 | rw->s.iter.iov += iov_off; |
ff6165b2 | 4006 | } |
538941e2 PB |
4007 | if (rw->s.fast_iov != fast_iov) |
4008 | memcpy(rw->s.fast_iov + iov_off, fast_iov + iov_off, | |
45097dae | 4009 | sizeof(struct iovec) * iter->nr_segs); |
99bc4c38 PB |
4010 | } else { |
4011 | req->flags |= REQ_F_NEED_CLEANUP; | |
f67676d1 JA |
4012 | } |
4013 | } | |
4014 | ||
8d4af685 | 4015 | static inline bool io_alloc_async_data(struct io_kiocb *req) |
3d9932a8 | 4016 | { |
e8c2bc1f JA |
4017 | WARN_ON_ONCE(!io_op_defs[req->opcode].async_size); |
4018 | req->async_data = kmalloc(io_op_defs[req->opcode].async_size, GFP_KERNEL); | |
d886e185 PB |
4019 | if (req->async_data) { |
4020 | req->flags |= REQ_F_ASYNC_DATA; | |
4021 | return false; | |
4022 | } | |
4023 | return true; | |
3d9932a8 XW |
4024 | } |
4025 | ||
ff6165b2 | 4026 | static int io_setup_async_rw(struct io_kiocb *req, const struct iovec *iovec, |
c88598a9 | 4027 | struct io_rw_state *s, bool force) |
b7bb4f7d | 4028 | { |
26f0505a | 4029 | if (!force && !io_op_defs[req->opcode].needs_async_setup) |
74566df3 | 4030 | return 0; |
d886e185 | 4031 | if (!req_has_async_data(req)) { |
cd658695 JA |
4032 | struct io_async_rw *iorw; |
4033 | ||
6cb78689 | 4034 | if (io_alloc_async_data(req)) { |
6bf985dc | 4035 | kfree(iovec); |
5d204bcf | 4036 | return -ENOMEM; |
6bf985dc | 4037 | } |
b7bb4f7d | 4038 | |
c88598a9 | 4039 | io_req_map_rw(req, iovec, s->fast_iov, &s->iter); |
cd658695 JA |
4040 | iorw = req->async_data; |
4041 | /* we've copied and mapped the iter, ensure state is saved */ | |
538941e2 | 4042 | iov_iter_save_state(&iorw->s.iter, &iorw->s.iter_state); |
5d204bcf | 4043 | } |
b7bb4f7d | 4044 | return 0; |
f67676d1 JA |
4045 | } |
4046 | ||
73debe68 | 4047 | static inline int io_rw_prep_async(struct io_kiocb *req, int rw) |
c3e330a4 | 4048 | { |
e8c2bc1f | 4049 | struct io_async_rw *iorw = req->async_data; |
5e49c973 | 4050 | struct iovec *iov; |
847595de | 4051 | int ret; |
c3e330a4 | 4052 | |
51aac424 | 4053 | /* submission path, ->uring_lock should already be taken */ |
3b44b371 | 4054 | ret = io_import_iovec(rw, req, &iov, &iorw->s, 0); |
c3e330a4 PB |
4055 | if (unlikely(ret < 0)) |
4056 | return ret; | |
4057 | ||
ab0b196c PB |
4058 | iorw->bytes_done = 0; |
4059 | iorw->free_iovec = iov; | |
4060 | if (iov) | |
4061 | req->flags |= REQ_F_NEED_CLEANUP; | |
c3e330a4 PB |
4062 | return 0; |
4063 | } | |
4064 | ||
c1dd91d1 | 4065 | /* |
ffdc8dab | 4066 | * This is our waitqueue callback handler, registered through __folio_lock_async() |
c1dd91d1 JA |
4067 | * when we initially tried to do the IO with the iocb armed our waitqueue. |
4068 | * This gets called when the page is unlocked, and we generally expect that to | |
4069 | * happen when the page IO is completed and the page is now uptodate. This will | |
4070 | * queue a task_work based retry of the operation, attempting to copy the data | |
4071 | * again. If the latter fails because the page was NOT uptodate, then we will | |
4072 | * do a thread based blocking retry of the operation. That's the unexpected | |
4073 | * slow path. | |
4074 | */ | |
bcf5a063 JA |
4075 | static int io_async_buf_func(struct wait_queue_entry *wait, unsigned mode, |
4076 | int sync, void *arg) | |
4077 | { | |
4078 | struct wait_page_queue *wpq; | |
4079 | struct io_kiocb *req = wait->private; | |
bcf5a063 | 4080 | struct wait_page_key *key = arg; |
bcf5a063 JA |
4081 | |
4082 | wpq = container_of(wait, struct wait_page_queue, wait); | |
4083 | ||
cdc8fcb4 LT |
4084 | if (!wake_page_match(wpq, key)) |
4085 | return 0; | |
4086 | ||
c8d317aa | 4087 | req->rw.kiocb.ki_flags &= ~IOCB_WAITQ; |
bcf5a063 | 4088 | list_del_init(&wait->entry); |
921b9054 | 4089 | io_req_task_queue(req); |
bcf5a063 JA |
4090 | return 1; |
4091 | } | |
4092 | ||
c1dd91d1 JA |
4093 | /* |
4094 | * This controls whether a given IO request should be armed for async page | |
4095 | * based retry. If we return false here, the request is handed to the async | |
4096 | * worker threads for retry. If we're doing buffered reads on a regular file, | |
4097 | * we prepare a private wait_page_queue entry and retry the operation. This | |
4098 | * will either succeed because the page is now uptodate and unlocked, or it | |
4099 | * will register a callback when the page is unlocked at IO completion. Through | |
4100 | * that callback, io_uring uses task_work to setup a retry of the operation. | |
4101 | * That retry will attempt the buffered read again. The retry will generally | |
4102 | * succeed, or in rare cases where it fails, we then fall back to using the | |
4103 | * async worker threads for a blocking retry. | |
4104 | */ | |
227c0c96 | 4105 | static bool io_rw_should_retry(struct io_kiocb *req) |
f67676d1 | 4106 | { |
e8c2bc1f JA |
4107 | struct io_async_rw *rw = req->async_data; |
4108 | struct wait_page_queue *wait = &rw->wpq; | |
bcf5a063 | 4109 | struct kiocb *kiocb = &req->rw.kiocb; |
f67676d1 | 4110 | |
bcf5a063 JA |
4111 | /* never retry for NOWAIT, we just complete with -EAGAIN */ |
4112 | if (req->flags & REQ_F_NOWAIT) | |
4113 | return false; | |
f67676d1 | 4114 | |
227c0c96 | 4115 | /* Only for buffered IO */ |
3b2a4439 | 4116 | if (kiocb->ki_flags & (IOCB_DIRECT | IOCB_HIPRI)) |
bcf5a063 | 4117 | return false; |
3b2a4439 | 4118 | |
bcf5a063 JA |
4119 | /* |
4120 | * just use poll if we can, and don't attempt if the fs doesn't | |
4121 | * support callback based unlocks | |
4122 | */ | |
4123 | if (file_can_poll(req->file) || !(req->file->f_mode & FMODE_BUF_RASYNC)) | |
4124 | return false; | |
f67676d1 | 4125 | |
3b2a4439 JA |
4126 | wait->wait.func = io_async_buf_func; |
4127 | wait->wait.private = req; | |
4128 | wait->wait.flags = 0; | |
4129 | INIT_LIST_HEAD(&wait->wait.entry); | |
4130 | kiocb->ki_flags |= IOCB_WAITQ; | |
c8d317aa | 4131 | kiocb->ki_flags &= ~IOCB_NOWAIT; |
3b2a4439 | 4132 | kiocb->ki_waitq = wait; |
3b2a4439 | 4133 | return true; |
bcf5a063 JA |
4134 | } |
4135 | ||
aeab9506 | 4136 | static inline int io_iter_do_read(struct io_kiocb *req, struct iov_iter *iter) |
bcf5a063 | 4137 | { |
607b6fb8 | 4138 | if (likely(req->file->f_op->read_iter)) |
bcf5a063 | 4139 | return call_read_iter(req->file, &req->rw.kiocb, iter); |
2dd2111d | 4140 | else if (req->file->f_op->read) |
4017eb91 | 4141 | return loop_rw_iter(READ, req, iter); |
2dd2111d GH |
4142 | else |
4143 | return -EINVAL; | |
f67676d1 JA |
4144 | } |
4145 | ||
7db30437 ML |
4146 | static bool need_read_all(struct io_kiocb *req) |
4147 | { | |
4148 | return req->flags & REQ_F_ISREG || | |
4149 | S_ISBLK(file_inode(req->file)->i_mode); | |
4150 | } | |
4151 | ||
584b0180 JA |
4152 | static int io_rw_init_file(struct io_kiocb *req, fmode_t mode) |
4153 | { | |
4154 | struct kiocb *kiocb = &req->rw.kiocb; | |
4155 | struct io_ring_ctx *ctx = req->ctx; | |
4156 | struct file *file = req->file; | |
4157 | int ret; | |
4158 | ||
4159 | if (unlikely(!file || !(file->f_mode & mode))) | |
4160 | return -EBADF; | |
4161 | ||
4162 | if (!io_req_ffs_set(req)) | |
4163 | req->flags |= io_file_get_flags(file) << REQ_F_SUPPORT_NOWAIT_BIT; | |
4164 | ||
4165 | kiocb->ki_flags = iocb_flags(file); | |
4166 | ret = kiocb_set_rw_flags(kiocb, req->rw.flags); | |
4167 | if (unlikely(ret)) | |
4168 | return ret; | |
4169 | ||
4170 | /* | |
4171 | * If the file is marked O_NONBLOCK, still allow retry for it if it | |
4172 | * supports async. Otherwise it's impossible to use O_NONBLOCK files | |
4173 | * reliably. If not, or it IOCB_NOWAIT is set, don't retry. | |
4174 | */ | |
4175 | if ((kiocb->ki_flags & IOCB_NOWAIT) || | |
4176 | ((file->f_flags & O_NONBLOCK) && !io_file_supports_nowait(req))) | |
4177 | req->flags |= REQ_F_NOWAIT; | |
4178 | ||
4179 | if (ctx->flags & IORING_SETUP_IOPOLL) { | |
4180 | if (!(kiocb->ki_flags & IOCB_DIRECT) || !file->f_op->iopoll) | |
4181 | return -EOPNOTSUPP; | |
4182 | ||
32452a3e | 4183 | kiocb->private = NULL; |
584b0180 JA |
4184 | kiocb->ki_flags |= IOCB_HIPRI | IOCB_ALLOC_CACHE; |
4185 | kiocb->ki_complete = io_complete_rw_iopoll; | |
4186 | req->iopoll_completed = 0; | |
4187 | } else { | |
4188 | if (kiocb->ki_flags & IOCB_HIPRI) | |
4189 | return -EINVAL; | |
4190 | kiocb->ki_complete = io_complete_rw; | |
4191 | } | |
4192 | ||
4193 | return 0; | |
4194 | } | |
4195 | ||
889fca73 | 4196 | static int io_read(struct io_kiocb *req, unsigned int issue_flags) |
2b188cc1 | 4197 | { |
607b6fb8 | 4198 | struct io_rw_state __s, *s = &__s; |
c88598a9 | 4199 | struct iovec *iovec; |
9adbd45d | 4200 | struct kiocb *kiocb = &req->rw.kiocb; |
45d189c6 | 4201 | bool force_nonblock = issue_flags & IO_URING_F_NONBLOCK; |
d886e185 | 4202 | struct io_async_rw *rw; |
cd658695 | 4203 | ssize_t ret, ret2; |
b4aec400 | 4204 | loff_t *ppos; |
ff6165b2 | 4205 | |
607b6fb8 PB |
4206 | if (!req_has_async_data(req)) { |
4207 | ret = io_import_iovec(READ, req, &iovec, s, issue_flags); | |
4208 | if (unlikely(ret < 0)) | |
4209 | return ret; | |
4210 | } else { | |
2be2eb02 JA |
4211 | /* |
4212 | * Safe and required to re-import if we're using provided | |
4213 | * buffers, as we dropped the selected one before retry. | |
4214 | */ | |
4215 | if (req->flags & REQ_F_BUFFER_SELECT) { | |
4216 | ret = io_import_iovec(READ, req, &iovec, s, issue_flags); | |
4217 | if (unlikely(ret < 0)) | |
4218 | return ret; | |
4219 | } | |
4220 | ||
d886e185 | 4221 | rw = req->async_data; |
c88598a9 | 4222 | s = &rw->s; |
cd658695 JA |
4223 | /* |
4224 | * We come here from an earlier attempt, restore our state to | |
4225 | * match in case it doesn't. It's cheap enough that we don't | |
4226 | * need to make this conditional. | |
4227 | */ | |
c88598a9 | 4228 | iov_iter_restore(&s->iter, &s->iter_state); |
2846c481 | 4229 | iovec = NULL; |
2846c481 | 4230 | } |
584b0180 | 4231 | ret = io_rw_init_file(req, FMODE_READ); |
323b190b JA |
4232 | if (unlikely(ret)) { |
4233 | kfree(iovec); | |
584b0180 | 4234 | return ret; |
323b190b | 4235 | } |
cef216fc | 4236 | req->cqe.res = iov_iter_count(&s->iter); |
2b188cc1 | 4237 | |
607b6fb8 PB |
4238 | if (force_nonblock) { |
4239 | /* If the file doesn't support async, just async punt */ | |
35645ac3 | 4240 | if (unlikely(!io_file_supports_nowait(req))) { |
607b6fb8 PB |
4241 | ret = io_setup_async_rw(req, iovec, s, true); |
4242 | return ret ?: -EAGAIN; | |
4243 | } | |
a88fc400 | 4244 | kiocb->ki_flags |= IOCB_NOWAIT; |
607b6fb8 PB |
4245 | } else { |
4246 | /* Ensure we clear previously set non-block flag */ | |
4247 | kiocb->ki_flags &= ~IOCB_NOWAIT; | |
6713e7a6 | 4248 | } |
9e645e11 | 4249 | |
b4aec400 | 4250 | ppos = io_kiocb_update_pos(req); |
d34e1e5b | 4251 | |
cef216fc | 4252 | ret = rw_verify_area(READ, req->file, ppos, req->cqe.res); |
5ea5dd45 PB |
4253 | if (unlikely(ret)) { |
4254 | kfree(iovec); | |
4255 | return ret; | |
4256 | } | |
2b188cc1 | 4257 | |
c88598a9 | 4258 | ret = io_iter_do_read(req, &s->iter); |
32960613 | 4259 | |
230d50d4 | 4260 | if (ret == -EAGAIN || (req->flags & REQ_F_REISSUE)) { |
6ad7f233 | 4261 | req->flags &= ~REQ_F_REISSUE; |
9af177ee JA |
4262 | /* if we can poll, just do that */ |
4263 | if (req->opcode == IORING_OP_READ && file_can_poll(req->file)) | |
4264 | return -EAGAIN; | |
eefdf30f JA |
4265 | /* IOPOLL retry should happen for io-wq threads */ |
4266 | if (!force_nonblock && !(req->ctx->flags & IORING_SETUP_IOPOLL)) | |
f91daf56 | 4267 | goto done; |
75c668cd PB |
4268 | /* no retry on NONBLOCK nor RWF_NOWAIT */ |
4269 | if (req->flags & REQ_F_NOWAIT) | |
355afaeb | 4270 | goto done; |
f38c7e3a | 4271 | ret = 0; |
230d50d4 JA |
4272 | } else if (ret == -EIOCBQUEUED) { |
4273 | goto out_free; | |
cef216fc | 4274 | } else if (ret == req->cqe.res || ret <= 0 || !force_nonblock || |
7db30437 | 4275 | (req->flags & REQ_F_NOWAIT) || !need_read_all(req)) { |
7335e3bf | 4276 | /* read all, failed, already did sync or don't want to retry */ |
00d23d51 | 4277 | goto done; |
227c0c96 JA |
4278 | } |
4279 | ||
cd658695 JA |
4280 | /* |
4281 | * Don't depend on the iter state matching what was consumed, or being | |
4282 | * untouched in case of error. Restore it and we'll advance it | |
4283 | * manually if we need to. | |
4284 | */ | |
c88598a9 | 4285 | iov_iter_restore(&s->iter, &s->iter_state); |
cd658695 | 4286 | |
c88598a9 | 4287 | ret2 = io_setup_async_rw(req, iovec, s, true); |
6bf985dc PB |
4288 | if (ret2) |
4289 | return ret2; | |
4290 | ||
fe1cdd55 | 4291 | iovec = NULL; |
e8c2bc1f | 4292 | rw = req->async_data; |
c88598a9 | 4293 | s = &rw->s; |
cd658695 JA |
4294 | /* |
4295 | * Now use our persistent iterator and state, if we aren't already. | |
4296 | * We've restored and mapped the iter to match. | |
4297 | */ | |
227c0c96 | 4298 | |
b23df91b | 4299 | do { |
cd658695 JA |
4300 | /* |
4301 | * We end up here because of a partial read, either from | |
4302 | * above or inside this loop. Advance the iter by the bytes | |
4303 | * that were consumed. | |
4304 | */ | |
c88598a9 PB |
4305 | iov_iter_advance(&s->iter, ret); |
4306 | if (!iov_iter_count(&s->iter)) | |
cd658695 | 4307 | break; |
b23df91b | 4308 | rw->bytes_done += ret; |
c88598a9 | 4309 | iov_iter_save_state(&s->iter, &s->iter_state); |
cd658695 | 4310 | |
b23df91b PB |
4311 | /* if we can retry, do so with the callbacks armed */ |
4312 | if (!io_rw_should_retry(req)) { | |
4313 | kiocb->ki_flags &= ~IOCB_WAITQ; | |
4314 | return -EAGAIN; | |
4315 | } | |
4316 | ||
4317 | /* | |
4318 | * Now retry read with the IOCB_WAITQ parts set in the iocb. If | |
4319 | * we get -EIOCBQUEUED, then we'll get a notification when the | |
4320 | * desired page gets unlocked. We can also get a partial read | |
4321 | * here, and if we do, then just retry at the new offset. | |
4322 | */ | |
c88598a9 | 4323 | ret = io_iter_do_read(req, &s->iter); |
b23df91b PB |
4324 | if (ret == -EIOCBQUEUED) |
4325 | return 0; | |
227c0c96 | 4326 | /* we got some bytes, but not all. retry. */ |
b5b0ecb7 | 4327 | kiocb->ki_flags &= ~IOCB_WAITQ; |
c88598a9 | 4328 | iov_iter_restore(&s->iter, &s->iter_state); |
cd658695 | 4329 | } while (ret > 0); |
227c0c96 | 4330 | done: |
2ea537ca | 4331 | kiocb_done(req, ret, issue_flags); |
fe1cdd55 PB |
4332 | out_free: |
4333 | /* it's faster to check here then delegate to kfree */ | |
4334 | if (iovec) | |
4335 | kfree(iovec); | |
5ea5dd45 | 4336 | return 0; |
2b188cc1 JA |
4337 | } |
4338 | ||
889fca73 | 4339 | static int io_write(struct io_kiocb *req, unsigned int issue_flags) |
2b188cc1 | 4340 | { |
607b6fb8 | 4341 | struct io_rw_state __s, *s = &__s; |
c88598a9 | 4342 | struct iovec *iovec; |
9adbd45d | 4343 | struct kiocb *kiocb = &req->rw.kiocb; |
45d189c6 | 4344 | bool force_nonblock = issue_flags & IO_URING_F_NONBLOCK; |
cd658695 | 4345 | ssize_t ret, ret2; |
b4aec400 | 4346 | loff_t *ppos; |
2b188cc1 | 4347 | |
607b6fb8 | 4348 | if (!req_has_async_data(req)) { |
5e49c973 PB |
4349 | ret = io_import_iovec(WRITE, req, &iovec, s, issue_flags); |
4350 | if (unlikely(ret < 0)) | |
2846c481 | 4351 | return ret; |
607b6fb8 PB |
4352 | } else { |
4353 | struct io_async_rw *rw = req->async_data; | |
4354 | ||
4355 | s = &rw->s; | |
4356 | iov_iter_restore(&s->iter, &s->iter_state); | |
2846c481 | 4357 | iovec = NULL; |
2846c481 | 4358 | } |
584b0180 | 4359 | ret = io_rw_init_file(req, FMODE_WRITE); |
323b190b JA |
4360 | if (unlikely(ret)) { |
4361 | kfree(iovec); | |
584b0180 | 4362 | return ret; |
323b190b | 4363 | } |
cef216fc | 4364 | req->cqe.res = iov_iter_count(&s->iter); |
2b188cc1 | 4365 | |
607b6fb8 PB |
4366 | if (force_nonblock) { |
4367 | /* If the file doesn't support async, just async punt */ | |
35645ac3 | 4368 | if (unlikely(!io_file_supports_nowait(req))) |
607b6fb8 | 4369 | goto copy_iov; |
fd6c2e4c | 4370 | |
607b6fb8 PB |
4371 | /* file path doesn't support NOWAIT for non-direct_IO */ |
4372 | if (force_nonblock && !(kiocb->ki_flags & IOCB_DIRECT) && | |
4373 | (req->flags & REQ_F_ISREG)) | |
4374 | goto copy_iov; | |
31b51510 | 4375 | |
607b6fb8 PB |
4376 | kiocb->ki_flags |= IOCB_NOWAIT; |
4377 | } else { | |
4378 | /* Ensure we clear previously set non-block flag */ | |
4379 | kiocb->ki_flags &= ~IOCB_NOWAIT; | |
4380 | } | |
31b51510 | 4381 | |
b4aec400 | 4382 | ppos = io_kiocb_update_pos(req); |
d34e1e5b | 4383 | |
cef216fc | 4384 | ret = rw_verify_area(WRITE, req->file, ppos, req->cqe.res); |
fa15bafb PB |
4385 | if (unlikely(ret)) |
4386 | goto out_free; | |
4ed734b0 | 4387 | |
fa15bafb PB |
4388 | /* |
4389 | * Open-code file_start_write here to grab freeze protection, | |
4390 | * which will be released by another thread in | |
4391 | * io_complete_rw(). Fool lockdep by telling it the lock got | |
4392 | * released so that it doesn't complain about the held lock when | |
4393 | * we return to userspace. | |
4394 | */ | |
4395 | if (req->flags & REQ_F_ISREG) { | |
8a3c84b6 | 4396 | sb_start_write(file_inode(req->file)->i_sb); |
fa15bafb PB |
4397 | __sb_writers_release(file_inode(req->file)->i_sb, |
4398 | SB_FREEZE_WRITE); | |
4399 | } | |
4400 | kiocb->ki_flags |= IOCB_WRITE; | |
4ed734b0 | 4401 | |
35645ac3 | 4402 | if (likely(req->file->f_op->write_iter)) |
c88598a9 | 4403 | ret2 = call_write_iter(req->file, kiocb, &s->iter); |
2dd2111d | 4404 | else if (req->file->f_op->write) |
c88598a9 | 4405 | ret2 = loop_rw_iter(WRITE, req, &s->iter); |
2dd2111d GH |
4406 | else |
4407 | ret2 = -EINVAL; | |
4ed734b0 | 4408 | |
6ad7f233 PB |
4409 | if (req->flags & REQ_F_REISSUE) { |
4410 | req->flags &= ~REQ_F_REISSUE; | |
230d50d4 | 4411 | ret2 = -EAGAIN; |
6ad7f233 | 4412 | } |
230d50d4 | 4413 | |
fa15bafb PB |
4414 | /* |
4415 | * Raw bdev writes will return -EOPNOTSUPP for IOCB_NOWAIT. Just | |
4416 | * retry them without IOCB_NOWAIT. | |
4417 | */ | |
4418 | if (ret2 == -EOPNOTSUPP && (kiocb->ki_flags & IOCB_NOWAIT)) | |
4419 | ret2 = -EAGAIN; | |
75c668cd PB |
4420 | /* no retry on NONBLOCK nor RWF_NOWAIT */ |
4421 | if (ret2 == -EAGAIN && (req->flags & REQ_F_NOWAIT)) | |
355afaeb | 4422 | goto done; |
fa15bafb | 4423 | if (!force_nonblock || ret2 != -EAGAIN) { |
eefdf30f | 4424 | /* IOPOLL retry should happen for io-wq threads */ |
b10841c9 | 4425 | if (ret2 == -EAGAIN && (req->ctx->flags & IORING_SETUP_IOPOLL)) |
eefdf30f | 4426 | goto copy_iov; |
355afaeb | 4427 | done: |
2ea537ca | 4428 | kiocb_done(req, ret2, issue_flags); |
fa15bafb | 4429 | } else { |
f67676d1 | 4430 | copy_iov: |
c88598a9 PB |
4431 | iov_iter_restore(&s->iter, &s->iter_state); |
4432 | ret = io_setup_async_rw(req, iovec, s, false); | |
6bf985dc | 4433 | return ret ?: -EAGAIN; |
2b188cc1 | 4434 | } |
31b51510 | 4435 | out_free: |
f261c168 | 4436 | /* it's reportedly faster than delegating the null check to kfree() */ |
252917c3 | 4437 | if (iovec) |
6f2cc166 | 4438 | kfree(iovec); |
2b188cc1 JA |
4439 | return ret; |
4440 | } | |
4441 | ||
80a261fd JA |
4442 | static int io_renameat_prep(struct io_kiocb *req, |
4443 | const struct io_uring_sqe *sqe) | |
4444 | { | |
4445 | struct io_rename *ren = &req->rename; | |
4446 | const char __user *oldf, *newf; | |
4447 | ||
73911426 | 4448 | if (sqe->buf_index || sqe->splice_fd_in) |
ed7eb259 | 4449 | return -EINVAL; |
80a261fd JA |
4450 | if (unlikely(req->flags & REQ_F_FIXED_FILE)) |
4451 | return -EBADF; | |
4452 | ||
4453 | ren->old_dfd = READ_ONCE(sqe->fd); | |
4454 | oldf = u64_to_user_ptr(READ_ONCE(sqe->addr)); | |
4455 | newf = u64_to_user_ptr(READ_ONCE(sqe->addr2)); | |
4456 | ren->new_dfd = READ_ONCE(sqe->len); | |
4457 | ren->flags = READ_ONCE(sqe->rename_flags); | |
4458 | ||
4459 | ren->oldpath = getname(oldf); | |
4460 | if (IS_ERR(ren->oldpath)) | |
4461 | return PTR_ERR(ren->oldpath); | |
4462 | ||
4463 | ren->newpath = getname(newf); | |
4464 | if (IS_ERR(ren->newpath)) { | |
4465 | putname(ren->oldpath); | |
4466 | return PTR_ERR(ren->newpath); | |
4467 | } | |
4468 | ||
4469 | req->flags |= REQ_F_NEED_CLEANUP; | |
4470 | return 0; | |
4471 | } | |
4472 | ||
45d189c6 | 4473 | static int io_renameat(struct io_kiocb *req, unsigned int issue_flags) |
80a261fd JA |
4474 | { |
4475 | struct io_rename *ren = &req->rename; | |
4476 | int ret; | |
4477 | ||
45d189c6 | 4478 | if (issue_flags & IO_URING_F_NONBLOCK) |
80a261fd JA |
4479 | return -EAGAIN; |
4480 | ||
4481 | ret = do_renameat2(ren->old_dfd, ren->oldpath, ren->new_dfd, | |
4482 | ren->newpath, ren->flags); | |
4483 | ||
4484 | req->flags &= ~REQ_F_NEED_CLEANUP; | |
4485 | if (ret < 0) | |
93d2bcd2 | 4486 | req_set_fail(req); |
80a261fd JA |
4487 | io_req_complete(req, ret); |
4488 | return 0; | |
4489 | } | |
4490 | ||
e9621e2b SR |
4491 | static inline void __io_xattr_finish(struct io_kiocb *req) |
4492 | { | |
4493 | struct io_xattr *ix = &req->xattr; | |
4494 | ||
4495 | if (ix->filename) | |
4496 | putname(ix->filename); | |
4497 | ||
4498 | kfree(ix->ctx.kname); | |
4499 | kvfree(ix->ctx.kvalue); | |
4500 | } | |
4501 | ||
4502 | static void io_xattr_finish(struct io_kiocb *req, int ret) | |
4503 | { | |
4504 | req->flags &= ~REQ_F_NEED_CLEANUP; | |
4505 | ||
4506 | __io_xattr_finish(req); | |
4507 | if (ret < 0) | |
4508 | req_set_fail(req); | |
4509 | ||
4510 | io_req_complete(req, ret); | |
4511 | } | |
4512 | ||
a56834e0 SR |
4513 | static int __io_getxattr_prep(struct io_kiocb *req, |
4514 | const struct io_uring_sqe *sqe) | |
4515 | { | |
4516 | struct io_xattr *ix = &req->xattr; | |
4517 | const char __user *name; | |
4518 | int ret; | |
4519 | ||
a56834e0 SR |
4520 | if (unlikely(req->flags & REQ_F_FIXED_FILE)) |
4521 | return -EBADF; | |
4522 | ||
4523 | ix->filename = NULL; | |
4524 | ix->ctx.kvalue = NULL; | |
4525 | name = u64_to_user_ptr(READ_ONCE(sqe->addr)); | |
4526 | ix->ctx.cvalue = u64_to_user_ptr(READ_ONCE(sqe->addr2)); | |
4527 | ix->ctx.size = READ_ONCE(sqe->len); | |
4528 | ix->ctx.flags = READ_ONCE(sqe->xattr_flags); | |
4529 | ||
4530 | if (ix->ctx.flags) | |
4531 | return -EINVAL; | |
4532 | ||
4533 | ix->ctx.kname = kmalloc(sizeof(*ix->ctx.kname), GFP_KERNEL); | |
4534 | if (!ix->ctx.kname) | |
4535 | return -ENOMEM; | |
4536 | ||
4537 | ret = strncpy_from_user(ix->ctx.kname->name, name, | |
4538 | sizeof(ix->ctx.kname->name)); | |
4539 | if (!ret || ret == sizeof(ix->ctx.kname->name)) | |
4540 | ret = -ERANGE; | |
4541 | if (ret < 0) { | |
4542 | kfree(ix->ctx.kname); | |
4543 | return ret; | |
4544 | } | |
4545 | ||
4546 | req->flags |= REQ_F_NEED_CLEANUP; | |
4547 | return 0; | |
4548 | } | |
4549 | ||
4550 | static int io_fgetxattr_prep(struct io_kiocb *req, | |
4551 | const struct io_uring_sqe *sqe) | |
4552 | { | |
4553 | return __io_getxattr_prep(req, sqe); | |
4554 | } | |
4555 | ||
4556 | static int io_getxattr_prep(struct io_kiocb *req, | |
4557 | const struct io_uring_sqe *sqe) | |
4558 | { | |
4559 | struct io_xattr *ix = &req->xattr; | |
4560 | const char __user *path; | |
4561 | int ret; | |
4562 | ||
4563 | ret = __io_getxattr_prep(req, sqe); | |
4564 | if (ret) | |
4565 | return ret; | |
4566 | ||
4567 | path = u64_to_user_ptr(READ_ONCE(sqe->addr3)); | |
4568 | ||
4569 | ix->filename = getname_flags(path, LOOKUP_FOLLOW, NULL); | |
4570 | if (IS_ERR(ix->filename)) { | |
4571 | ret = PTR_ERR(ix->filename); | |
4572 | ix->filename = NULL; | |
4573 | } | |
4574 | ||
4575 | return ret; | |
4576 | } | |
4577 | ||
4578 | static int io_fgetxattr(struct io_kiocb *req, unsigned int issue_flags) | |
4579 | { | |
4580 | struct io_xattr *ix = &req->xattr; | |
4581 | int ret; | |
4582 | ||
4583 | if (issue_flags & IO_URING_F_NONBLOCK) | |
4584 | return -EAGAIN; | |
4585 | ||
4586 | ret = do_getxattr(mnt_user_ns(req->file->f_path.mnt), | |
4587 | req->file->f_path.dentry, | |
4588 | &ix->ctx); | |
4589 | ||
4590 | io_xattr_finish(req, ret); | |
4591 | return 0; | |
4592 | } | |
4593 | ||
4594 | static int io_getxattr(struct io_kiocb *req, unsigned int issue_flags) | |
4595 | { | |
4596 | struct io_xattr *ix = &req->xattr; | |
4597 | unsigned int lookup_flags = LOOKUP_FOLLOW; | |
4598 | struct path path; | |
4599 | int ret; | |
4600 | ||
4601 | if (issue_flags & IO_URING_F_NONBLOCK) | |
4602 | return -EAGAIN; | |
4603 | ||
4604 | retry: | |
4605 | ret = filename_lookup(AT_FDCWD, ix->filename, lookup_flags, &path, NULL); | |
4606 | if (!ret) { | |
4607 | ret = do_getxattr(mnt_user_ns(path.mnt), | |
4608 | path.dentry, | |
4609 | &ix->ctx); | |
4610 | ||
4611 | path_put(&path); | |
4612 | if (retry_estale(ret, lookup_flags)) { | |
4613 | lookup_flags |= LOOKUP_REVAL; | |
4614 | goto retry; | |
4615 | } | |
4616 | } | |
4617 | ||
4618 | io_xattr_finish(req, ret); | |
4619 | return 0; | |
4620 | } | |
4621 | ||
e9621e2b SR |
4622 | static int __io_setxattr_prep(struct io_kiocb *req, |
4623 | const struct io_uring_sqe *sqe) | |
4624 | { | |
4625 | struct io_xattr *ix = &req->xattr; | |
4626 | const char __user *name; | |
4627 | int ret; | |
4628 | ||
e9621e2b SR |
4629 | if (unlikely(req->flags & REQ_F_FIXED_FILE)) |
4630 | return -EBADF; | |
4631 | ||
4632 | ix->filename = NULL; | |
4633 | name = u64_to_user_ptr(READ_ONCE(sqe->addr)); | |
4634 | ix->ctx.cvalue = u64_to_user_ptr(READ_ONCE(sqe->addr2)); | |
4635 | ix->ctx.kvalue = NULL; | |
4636 | ix->ctx.size = READ_ONCE(sqe->len); | |
4637 | ix->ctx.flags = READ_ONCE(sqe->xattr_flags); | |
4638 | ||
4639 | ix->ctx.kname = kmalloc(sizeof(*ix->ctx.kname), GFP_KERNEL); | |
4640 | if (!ix->ctx.kname) | |
4641 | return -ENOMEM; | |
4642 | ||
4643 | ret = setxattr_copy(name, &ix->ctx); | |
4644 | if (ret) { | |
4645 | kfree(ix->ctx.kname); | |
4646 | return ret; | |
4647 | } | |
4648 | ||
4649 | req->flags |= REQ_F_NEED_CLEANUP; | |
4650 | return 0; | |
4651 | } | |
4652 | ||
4653 | static int io_setxattr_prep(struct io_kiocb *req, | |
4654 | const struct io_uring_sqe *sqe) | |
4655 | { | |
4656 | struct io_xattr *ix = &req->xattr; | |
4657 | const char __user *path; | |
4658 | int ret; | |
4659 | ||
4660 | ret = __io_setxattr_prep(req, sqe); | |
4661 | if (ret) | |
4662 | return ret; | |
4663 | ||
4664 | path = u64_to_user_ptr(READ_ONCE(sqe->addr3)); | |
4665 | ||
4666 | ix->filename = getname_flags(path, LOOKUP_FOLLOW, NULL); | |
4667 | if (IS_ERR(ix->filename)) { | |
4668 | ret = PTR_ERR(ix->filename); | |
4669 | ix->filename = NULL; | |
4670 | } | |
4671 | ||
4672 | return ret; | |
4673 | } | |
4674 | ||
4675 | static int io_fsetxattr_prep(struct io_kiocb *req, | |
4676 | const struct io_uring_sqe *sqe) | |
4677 | { | |
4678 | return __io_setxattr_prep(req, sqe); | |
4679 | } | |
4680 | ||
4681 | static int __io_setxattr(struct io_kiocb *req, unsigned int issue_flags, | |
4682 | struct path *path) | |
4683 | { | |
4684 | struct io_xattr *ix = &req->xattr; | |
4685 | int ret; | |
4686 | ||
4687 | ret = mnt_want_write(path->mnt); | |
4688 | if (!ret) { | |
4689 | ret = do_setxattr(mnt_user_ns(path->mnt), path->dentry, &ix->ctx); | |
4690 | mnt_drop_write(path->mnt); | |
4691 | } | |
4692 | ||
4693 | return ret; | |
4694 | } | |
4695 | ||
4696 | static int io_fsetxattr(struct io_kiocb *req, unsigned int issue_flags) | |
4697 | { | |
4698 | int ret; | |
4699 | ||
4700 | if (issue_flags & IO_URING_F_NONBLOCK) | |
4701 | return -EAGAIN; | |
4702 | ||
4703 | ret = __io_setxattr(req, issue_flags, &req->file->f_path); | |
4704 | io_xattr_finish(req, ret); | |
4705 | ||
4706 | return 0; | |
4707 | } | |
4708 | ||
4709 | static int io_setxattr(struct io_kiocb *req, unsigned int issue_flags) | |
4710 | { | |
4711 | struct io_xattr *ix = &req->xattr; | |
4712 | unsigned int lookup_flags = LOOKUP_FOLLOW; | |
4713 | struct path path; | |
4714 | int ret; | |
4715 | ||
4716 | if (issue_flags & IO_URING_F_NONBLOCK) | |
4717 | return -EAGAIN; | |
4718 | ||
4719 | retry: | |
4720 | ret = filename_lookup(AT_FDCWD, ix->filename, lookup_flags, &path, NULL); | |
4721 | if (!ret) { | |
4722 | ret = __io_setxattr(req, issue_flags, &path); | |
4723 | path_put(&path); | |
4724 | if (retry_estale(ret, lookup_flags)) { | |
4725 | lookup_flags |= LOOKUP_REVAL; | |
4726 | goto retry; | |
4727 | } | |
4728 | } | |
4729 | ||
4730 | io_xattr_finish(req, ret); | |
4731 | return 0; | |
4732 | } | |
4733 | ||
14a1143b JA |
4734 | static int io_unlinkat_prep(struct io_kiocb *req, |
4735 | const struct io_uring_sqe *sqe) | |
4736 | { | |
4737 | struct io_unlink *un = &req->unlink; | |
4738 | const char __user *fname; | |
4739 | ||
73911426 | 4740 | if (sqe->off || sqe->len || sqe->buf_index || sqe->splice_fd_in) |
22634bc5 | 4741 | return -EINVAL; |
14a1143b JA |
4742 | if (unlikely(req->flags & REQ_F_FIXED_FILE)) |
4743 | return -EBADF; | |
4744 | ||
4745 | un->dfd = READ_ONCE(sqe->fd); | |
4746 | ||
4747 | un->flags = READ_ONCE(sqe->unlink_flags); | |
4748 | if (un->flags & ~AT_REMOVEDIR) | |
4749 | return -EINVAL; | |
4750 | ||
4751 | fname = u64_to_user_ptr(READ_ONCE(sqe->addr)); | |
4752 | un->filename = getname(fname); | |
4753 | if (IS_ERR(un->filename)) | |
4754 | return PTR_ERR(un->filename); | |
4755 | ||
4756 | req->flags |= REQ_F_NEED_CLEANUP; | |
4757 | return 0; | |
4758 | } | |
4759 | ||
45d189c6 | 4760 | static int io_unlinkat(struct io_kiocb *req, unsigned int issue_flags) |
14a1143b JA |
4761 | { |
4762 | struct io_unlink *un = &req->unlink; | |
4763 | int ret; | |
4764 | ||
45d189c6 | 4765 | if (issue_flags & IO_URING_F_NONBLOCK) |
14a1143b JA |
4766 | return -EAGAIN; |
4767 | ||
4768 | if (un->flags & AT_REMOVEDIR) | |
4769 | ret = do_rmdir(un->dfd, un->filename); | |
4770 | else | |
4771 | ret = do_unlinkat(un->dfd, un->filename); | |
4772 | ||
4773 | req->flags &= ~REQ_F_NEED_CLEANUP; | |
4774 | if (ret < 0) | |
93d2bcd2 | 4775 | req_set_fail(req); |
14a1143b JA |
4776 | io_req_complete(req, ret); |
4777 | return 0; | |
4778 | } | |
4779 | ||
e34a02dc DK |
4780 | static int io_mkdirat_prep(struct io_kiocb *req, |
4781 | const struct io_uring_sqe *sqe) | |
4782 | { | |
4783 | struct io_mkdir *mkd = &req->mkdir; | |
4784 | const char __user *fname; | |
4785 | ||
73911426 | 4786 | if (sqe->off || sqe->rw_flags || sqe->buf_index || sqe->splice_fd_in) |
e34a02dc DK |
4787 | return -EINVAL; |
4788 | if (unlikely(req->flags & REQ_F_FIXED_FILE)) | |
4789 | return -EBADF; | |
4790 | ||
4791 | mkd->dfd = READ_ONCE(sqe->fd); | |
4792 | mkd->mode = READ_ONCE(sqe->len); | |
4793 | ||
4794 | fname = u64_to_user_ptr(READ_ONCE(sqe->addr)); | |
4795 | mkd->filename = getname(fname); | |
4796 | if (IS_ERR(mkd->filename)) | |
4797 | return PTR_ERR(mkd->filename); | |
4798 | ||
4799 | req->flags |= REQ_F_NEED_CLEANUP; | |
4800 | return 0; | |
4801 | } | |
4802 | ||
04f34081 | 4803 | static int io_mkdirat(struct io_kiocb *req, unsigned int issue_flags) |
e34a02dc DK |
4804 | { |
4805 | struct io_mkdir *mkd = &req->mkdir; | |
4806 | int ret; | |
4807 | ||
4808 | if (issue_flags & IO_URING_F_NONBLOCK) | |
4809 | return -EAGAIN; | |
4810 | ||
4811 | ret = do_mkdirat(mkd->dfd, mkd->filename, mkd->mode); | |
4812 | ||
4813 | req->flags &= ~REQ_F_NEED_CLEANUP; | |
4814 | if (ret < 0) | |
4815 | req_set_fail(req); | |
4816 | io_req_complete(req, ret); | |
4817 | return 0; | |
4818 | } | |
4819 | ||
7a8721f8 DK |
4820 | static int io_symlinkat_prep(struct io_kiocb *req, |
4821 | const struct io_uring_sqe *sqe) | |
4822 | { | |
4823 | struct io_symlink *sl = &req->symlink; | |
4824 | const char __user *oldpath, *newpath; | |
4825 | ||
73911426 | 4826 | if (sqe->len || sqe->rw_flags || sqe->buf_index || sqe->splice_fd_in) |
7a8721f8 DK |
4827 | return -EINVAL; |
4828 | if (unlikely(req->flags & REQ_F_FIXED_FILE)) | |
4829 | return -EBADF; | |
4830 | ||
4831 | sl->new_dfd = READ_ONCE(sqe->fd); | |
4832 | oldpath = u64_to_user_ptr(READ_ONCE(sqe->addr)); | |
4833 | newpath = u64_to_user_ptr(READ_ONCE(sqe->addr2)); | |
4834 | ||
4835 | sl->oldpath = getname(oldpath); | |
4836 | if (IS_ERR(sl->oldpath)) | |
4837 | return PTR_ERR(sl->oldpath); | |
4838 | ||
4839 | sl->newpath = getname(newpath); | |
4840 | if (IS_ERR(sl->newpath)) { | |
4841 | putname(sl->oldpath); | |
4842 | return PTR_ERR(sl->newpath); | |
4843 | } | |
4844 | ||
4845 | req->flags |= REQ_F_NEED_CLEANUP; | |
4846 | return 0; | |
4847 | } | |
4848 | ||
04f34081 | 4849 | static int io_symlinkat(struct io_kiocb *req, unsigned int issue_flags) |
7a8721f8 DK |
4850 | { |
4851 | struct io_symlink *sl = &req->symlink; | |
4852 | int ret; | |
4853 | ||
4854 | if (issue_flags & IO_URING_F_NONBLOCK) | |
4855 | return -EAGAIN; | |
4856 | ||
4857 | ret = do_symlinkat(sl->oldpath, sl->new_dfd, sl->newpath); | |
4858 | ||
4859 | req->flags &= ~REQ_F_NEED_CLEANUP; | |
4860 | if (ret < 0) | |
4861 | req_set_fail(req); | |
4862 | io_req_complete(req, ret); | |
4863 | return 0; | |
4864 | } | |
4865 | ||
cf30da90 DK |
4866 | static int io_linkat_prep(struct io_kiocb *req, |
4867 | const struct io_uring_sqe *sqe) | |
4868 | { | |
4869 | struct io_hardlink *lnk = &req->hardlink; | |
4870 | const char __user *oldf, *newf; | |
4871 | ||
73911426 | 4872 | if (sqe->rw_flags || sqe->buf_index || sqe->splice_fd_in) |
cf30da90 DK |
4873 | return -EINVAL; |
4874 | if (unlikely(req->flags & REQ_F_FIXED_FILE)) | |
4875 | return -EBADF; | |
4876 | ||
4877 | lnk->old_dfd = READ_ONCE(sqe->fd); | |
4878 | lnk->new_dfd = READ_ONCE(sqe->len); | |
4879 | oldf = u64_to_user_ptr(READ_ONCE(sqe->addr)); | |
4880 | newf = u64_to_user_ptr(READ_ONCE(sqe->addr2)); | |
4881 | lnk->flags = READ_ONCE(sqe->hardlink_flags); | |
4882 | ||
4883 | lnk->oldpath = getname(oldf); | |
4884 | if (IS_ERR(lnk->oldpath)) | |
4885 | return PTR_ERR(lnk->oldpath); | |
4886 | ||
4887 | lnk->newpath = getname(newf); | |
4888 | if (IS_ERR(lnk->newpath)) { | |
4889 | putname(lnk->oldpath); | |
4890 | return PTR_ERR(lnk->newpath); | |
4891 | } | |
4892 | ||
4893 | req->flags |= REQ_F_NEED_CLEANUP; | |
4894 | return 0; | |
4895 | } | |
4896 | ||
04f34081 | 4897 | static int io_linkat(struct io_kiocb *req, unsigned int issue_flags) |
cf30da90 DK |
4898 | { |
4899 | struct io_hardlink *lnk = &req->hardlink; | |
4900 | int ret; | |
4901 | ||
4902 | if (issue_flags & IO_URING_F_NONBLOCK) | |
4903 | return -EAGAIN; | |
4904 | ||
4905 | ret = do_linkat(lnk->old_dfd, lnk->oldpath, lnk->new_dfd, | |
4906 | lnk->newpath, lnk->flags); | |
4907 | ||
4908 | req->flags &= ~REQ_F_NEED_CLEANUP; | |
4909 | if (ret < 0) | |
4910 | req_set_fail(req); | |
4911 | io_req_complete(req, ret); | |
4912 | return 0; | |
4913 | } | |
4914 | ||
ee692a21 JA |
4915 | static void io_uring_cmd_work(struct io_kiocb *req, bool *locked) |
4916 | { | |
4917 | req->uring_cmd.task_work_cb(&req->uring_cmd); | |
4918 | } | |
4919 | ||
4920 | void io_uring_cmd_complete_in_task(struct io_uring_cmd *ioucmd, | |
4921 | void (*task_work_cb)(struct io_uring_cmd *)) | |
4922 | { | |
4923 | struct io_kiocb *req = container_of(ioucmd, struct io_kiocb, uring_cmd); | |
4924 | ||
4925 | req->uring_cmd.task_work_cb = task_work_cb; | |
4926 | req->io_task_work.func = io_uring_cmd_work; | |
4927 | io_req_task_work_add(req, !!(req->ctx->flags & IORING_SETUP_SQPOLL)); | |
4928 | } | |
4929 | EXPORT_SYMBOL_GPL(io_uring_cmd_complete_in_task); | |
4930 | ||
4931 | /* | |
4932 | * Called by consumers of io_uring_cmd, if they originally returned | |
4933 | * -EIOCBQUEUED upon receiving the command. | |
4934 | */ | |
4935 | void io_uring_cmd_done(struct io_uring_cmd *ioucmd, ssize_t ret, ssize_t res2) | |
4936 | { | |
4937 | struct io_kiocb *req = container_of(ioucmd, struct io_kiocb, uring_cmd); | |
4938 | ||
4939 | if (ret < 0) | |
4940 | req_set_fail(req); | |
4941 | if (req->ctx->flags & IORING_SETUP_CQE32) | |
4942 | __io_req_complete32(req, 0, ret, 0, res2, 0); | |
4943 | else | |
4944 | io_req_complete(req, ret); | |
4945 | } | |
4946 | EXPORT_SYMBOL_GPL(io_uring_cmd_done); | |
4947 | ||
4948 | static int io_uring_cmd_prep_async(struct io_kiocb *req) | |
4949 | { | |
4950 | size_t cmd_size; | |
4951 | ||
4952 | cmd_size = uring_cmd_pdu_size(req->ctx->flags & IORING_SETUP_SQE128); | |
4953 | ||
4954 | memcpy(req->async_data, req->uring_cmd.cmd, cmd_size); | |
4955 | return 0; | |
4956 | } | |
4957 | ||
4958 | static int io_uring_cmd_prep(struct io_kiocb *req, | |
4959 | const struct io_uring_sqe *sqe) | |
4960 | { | |
4961 | struct io_uring_cmd *ioucmd = &req->uring_cmd; | |
4962 | ||
4963 | if (sqe->rw_flags) | |
4964 | return -EINVAL; | |
4965 | ioucmd->cmd = sqe->cmd; | |
4966 | ioucmd->cmd_op = READ_ONCE(sqe->cmd_op); | |
4967 | return 0; | |
4968 | } | |
4969 | ||
4970 | static int io_uring_cmd(struct io_kiocb *req, unsigned int issue_flags) | |
4971 | { | |
4972 | struct io_uring_cmd *ioucmd = &req->uring_cmd; | |
4973 | struct io_ring_ctx *ctx = req->ctx; | |
4974 | struct file *file = req->file; | |
4975 | int ret; | |
4976 | ||
4977 | if (!req->file->f_op->uring_cmd) | |
4978 | return -EOPNOTSUPP; | |
4979 | ||
4980 | if (ctx->flags & IORING_SETUP_SQE128) | |
4981 | issue_flags |= IO_URING_F_SQE128; | |
4982 | if (ctx->flags & IORING_SETUP_CQE32) | |
4983 | issue_flags |= IO_URING_F_CQE32; | |
4984 | if (ctx->flags & IORING_SETUP_IOPOLL) | |
4985 | issue_flags |= IO_URING_F_IOPOLL; | |
4986 | ||
4987 | if (req_has_async_data(req)) | |
4988 | ioucmd->cmd = req->async_data; | |
4989 | ||
4990 | ret = file->f_op->uring_cmd(ioucmd, issue_flags); | |
4991 | if (ret == -EAGAIN) { | |
4992 | if (!req_has_async_data(req)) { | |
4993 | if (io_alloc_async_data(req)) | |
4994 | return -ENOMEM; | |
4995 | io_uring_cmd_prep_async(req); | |
4996 | } | |
4997 | return -EAGAIN; | |
4998 | } | |
4999 | ||
5000 | if (ret != -EIOCBQUEUED) | |
5001 | io_uring_cmd_done(ioucmd, ret, 0); | |
5002 | return 0; | |
5003 | } | |
5004 | ||
36f4fa68 JA |
5005 | static int io_shutdown_prep(struct io_kiocb *req, |
5006 | const struct io_uring_sqe *sqe) | |
5007 | { | |
5008 | #if defined(CONFIG_NET) | |
73911426 | 5009 | if (unlikely(sqe->off || sqe->addr || sqe->rw_flags || |
26578cda | 5010 | sqe->buf_index || sqe->splice_fd_in)) |
36f4fa68 JA |
5011 | return -EINVAL; |
5012 | ||
5013 | req->shutdown.how = READ_ONCE(sqe->len); | |
5014 | return 0; | |
5015 | #else | |
5016 | return -EOPNOTSUPP; | |
5017 | #endif | |
5018 | } | |
5019 | ||
45d189c6 | 5020 | static int io_shutdown(struct io_kiocb *req, unsigned int issue_flags) |
36f4fa68 JA |
5021 | { |
5022 | #if defined(CONFIG_NET) | |
5023 | struct socket *sock; | |
5024 | int ret; | |
5025 | ||
45d189c6 | 5026 | if (issue_flags & IO_URING_F_NONBLOCK) |
36f4fa68 JA |
5027 | return -EAGAIN; |
5028 | ||
48aba79b | 5029 | sock = sock_from_file(req->file); |
36f4fa68 | 5030 | if (unlikely(!sock)) |
48aba79b | 5031 | return -ENOTSOCK; |
36f4fa68 JA |
5032 | |
5033 | ret = __sys_shutdown_sock(sock, req->shutdown.how); | |
a146468d | 5034 | if (ret < 0) |
93d2bcd2 | 5035 | req_set_fail(req); |
36f4fa68 JA |
5036 | io_req_complete(req, ret); |
5037 | return 0; | |
5038 | #else | |
5039 | return -EOPNOTSUPP; | |
5040 | #endif | |
5041 | } | |
5042 | ||
f2a8d5c7 PB |
5043 | static int __io_splice_prep(struct io_kiocb *req, |
5044 | const struct io_uring_sqe *sqe) | |
7d67af2c | 5045 | { |
fe7e3257 | 5046 | struct io_splice *sp = &req->splice; |
7d67af2c | 5047 | unsigned int valid_flags = SPLICE_F_FD_IN_FIXED | SPLICE_F_ALL; |
7d67af2c | 5048 | |
7d67af2c PB |
5049 | sp->len = READ_ONCE(sqe->len); |
5050 | sp->flags = READ_ONCE(sqe->splice_flags); | |
7d67af2c PB |
5051 | if (unlikely(sp->flags & ~valid_flags)) |
5052 | return -EINVAL; | |
a3e4bc23 | 5053 | sp->splice_fd_in = READ_ONCE(sqe->splice_fd_in); |
7d67af2c PB |
5054 | return 0; |
5055 | } | |
5056 | ||
f2a8d5c7 PB |
5057 | static int io_tee_prep(struct io_kiocb *req, |
5058 | const struct io_uring_sqe *sqe) | |
5059 | { | |
5060 | if (READ_ONCE(sqe->splice_off_in) || READ_ONCE(sqe->off)) | |
5061 | return -EINVAL; | |
5062 | return __io_splice_prep(req, sqe); | |
5063 | } | |
5064 | ||
45d189c6 | 5065 | static int io_tee(struct io_kiocb *req, unsigned int issue_flags) |
f2a8d5c7 PB |
5066 | { |
5067 | struct io_splice *sp = &req->splice; | |
f2a8d5c7 PB |
5068 | struct file *out = sp->file_out; |
5069 | unsigned int flags = sp->flags & ~SPLICE_F_FD_IN_FIXED; | |
a3e4bc23 | 5070 | struct file *in; |
f2a8d5c7 PB |
5071 | long ret = 0; |
5072 | ||
45d189c6 | 5073 | if (issue_flags & IO_URING_F_NONBLOCK) |
f2a8d5c7 | 5074 | return -EAGAIN; |
a3e4bc23 | 5075 | |
5106dd6e | 5076 | if (sp->flags & SPLICE_F_FD_IN_FIXED) |
e9419766 | 5077 | in = io_file_get_fixed(req, sp->splice_fd_in, issue_flags); |
5106dd6e JA |
5078 | else |
5079 | in = io_file_get_normal(req, sp->splice_fd_in); | |
a3e4bc23 JA |
5080 | if (!in) { |
5081 | ret = -EBADF; | |
5082 | goto done; | |
5083 | } | |
5084 | ||
f2a8d5c7 PB |
5085 | if (sp->len) |
5086 | ret = do_tee(in, out, sp->len, flags); | |
5087 | ||
e1d767f0 PB |
5088 | if (!(sp->flags & SPLICE_F_FD_IN_FIXED)) |
5089 | io_put_file(in); | |
a3e4bc23 | 5090 | done: |
f2a8d5c7 | 5091 | if (ret != sp->len) |
93d2bcd2 | 5092 | req_set_fail(req); |
e1e16097 | 5093 | io_req_complete(req, ret); |
f2a8d5c7 PB |
5094 | return 0; |
5095 | } | |
5096 | ||
5097 | static int io_splice_prep(struct io_kiocb *req, const struct io_uring_sqe *sqe) | |
5098 | { | |
fe7e3257 | 5099 | struct io_splice *sp = &req->splice; |
f2a8d5c7 PB |
5100 | |
5101 | sp->off_in = READ_ONCE(sqe->splice_off_in); | |
5102 | sp->off_out = READ_ONCE(sqe->off); | |
5103 | return __io_splice_prep(req, sqe); | |
5104 | } | |
5105 | ||
45d189c6 | 5106 | static int io_splice(struct io_kiocb *req, unsigned int issue_flags) |
7d67af2c PB |
5107 | { |
5108 | struct io_splice *sp = &req->splice; | |
7d67af2c PB |
5109 | struct file *out = sp->file_out; |
5110 | unsigned int flags = sp->flags & ~SPLICE_F_FD_IN_FIXED; | |
5111 | loff_t *poff_in, *poff_out; | |
a3e4bc23 | 5112 | struct file *in; |
c9687426 | 5113 | long ret = 0; |
7d67af2c | 5114 | |
45d189c6 | 5115 | if (issue_flags & IO_URING_F_NONBLOCK) |
2fb3e822 | 5116 | return -EAGAIN; |
7d67af2c | 5117 | |
5106dd6e | 5118 | if (sp->flags & SPLICE_F_FD_IN_FIXED) |
e9419766 | 5119 | in = io_file_get_fixed(req, sp->splice_fd_in, issue_flags); |
5106dd6e JA |
5120 | else |
5121 | in = io_file_get_normal(req, sp->splice_fd_in); | |
a3e4bc23 JA |
5122 | if (!in) { |
5123 | ret = -EBADF; | |
5124 | goto done; | |
5125 | } | |
5126 | ||
7d67af2c PB |
5127 | poff_in = (sp->off_in == -1) ? NULL : &sp->off_in; |
5128 | poff_out = (sp->off_out == -1) ? NULL : &sp->off_out; | |
c9687426 | 5129 | |
948a7749 | 5130 | if (sp->len) |
c9687426 | 5131 | ret = do_splice(in, poff_in, out, poff_out, sp->len, flags); |
7d67af2c | 5132 | |
e1d767f0 PB |
5133 | if (!(sp->flags & SPLICE_F_FD_IN_FIXED)) |
5134 | io_put_file(in); | |
a3e4bc23 | 5135 | done: |
7d67af2c | 5136 | if (ret != sp->len) |
93d2bcd2 | 5137 | req_set_fail(req); |
e1e16097 | 5138 | io_req_complete(req, ret); |
7d67af2c PB |
5139 | return 0; |
5140 | } | |
5141 | ||
2bb04df7 SR |
5142 | static int io_nop_prep(struct io_kiocb *req, const struct io_uring_sqe *sqe) |
5143 | { | |
5144 | /* | |
5145 | * If the ring is setup with CQE32, relay back addr/addr | |
5146 | */ | |
5147 | if (req->ctx->flags & IORING_SETUP_CQE32) { | |
5148 | req->nop.extra1 = READ_ONCE(sqe->addr); | |
5149 | req->nop.extra2 = READ_ONCE(sqe->addr2); | |
5150 | } | |
5151 | ||
5152 | return 0; | |
5153 | } | |
5154 | ||
2b188cc1 JA |
5155 | /* |
5156 | * IORING_OP_NOP just posts a completion event, nothing else. | |
5157 | */ | |
889fca73 | 5158 | static int io_nop(struct io_kiocb *req, unsigned int issue_flags) |
2b188cc1 | 5159 | { |
2bb04df7 SR |
5160 | if (!(req->ctx->flags & IORING_SETUP_CQE32)) |
5161 | __io_req_complete(req, issue_flags, 0, 0); | |
5162 | else | |
5163 | __io_req_complete32(req, issue_flags, 0, 0, req->nop.extra1, | |
5164 | req->nop.extra2); | |
2b188cc1 JA |
5165 | return 0; |
5166 | } | |
5167 | ||
4f57f06c JA |
5168 | static int io_msg_ring_prep(struct io_kiocb *req, |
5169 | const struct io_uring_sqe *sqe) | |
5170 | { | |
73911426 JA |
5171 | if (unlikely(sqe->addr || sqe->rw_flags || sqe->splice_fd_in || |
5172 | sqe->buf_index || sqe->personality)) | |
4f57f06c JA |
5173 | return -EINVAL; |
5174 | ||
4f57f06c JA |
5175 | req->msg.user_data = READ_ONCE(sqe->off); |
5176 | req->msg.len = READ_ONCE(sqe->len); | |
5177 | return 0; | |
5178 | } | |
5179 | ||
5180 | static int io_msg_ring(struct io_kiocb *req, unsigned int issue_flags) | |
5181 | { | |
5182 | struct io_ring_ctx *target_ctx; | |
5183 | struct io_msg *msg = &req->msg; | |
4f57f06c | 5184 | bool filled; |
3f1d52ab | 5185 | int ret; |
4f57f06c | 5186 | |
3f1d52ab JA |
5187 | ret = -EBADFD; |
5188 | if (req->file->f_op != &io_uring_fops) | |
5189 | goto done; | |
4f57f06c | 5190 | |
3f1d52ab | 5191 | ret = -EOVERFLOW; |
4f57f06c JA |
5192 | target_ctx = req->file->private_data; |
5193 | ||
5194 | spin_lock(&target_ctx->completion_lock); | |
7ef66d18 | 5195 | filled = io_fill_cqe_aux(target_ctx, msg->user_data, msg->len, 0); |
4f57f06c JA |
5196 | io_commit_cqring(target_ctx); |
5197 | spin_unlock(&target_ctx->completion_lock); | |
5198 | ||
5199 | if (filled) { | |
5200 | io_cqring_ev_posted(target_ctx); | |
5201 | ret = 0; | |
5202 | } | |
5203 | ||
3f1d52ab | 5204 | done: |
9666d420 JA |
5205 | if (ret < 0) |
5206 | req_set_fail(req); | |
4f57f06c JA |
5207 | __io_req_complete(req, issue_flags, ret, 0); |
5208 | return 0; | |
5209 | } | |
5210 | ||
1155c76a | 5211 | static int io_fsync_prep(struct io_kiocb *req, const struct io_uring_sqe *sqe) |
c992fe29 | 5212 | { |
73911426 | 5213 | if (unlikely(sqe->addr || sqe->buf_index || sqe->splice_fd_in)) |
c992fe29 CH |
5214 | return -EINVAL; |
5215 | ||
8ed8d3c3 JA |
5216 | req->sync.flags = READ_ONCE(sqe->fsync_flags); |
5217 | if (unlikely(req->sync.flags & ~IORING_FSYNC_DATASYNC)) | |
5218 | return -EINVAL; | |
5219 | ||
5220 | req->sync.off = READ_ONCE(sqe->off); | |
5221 | req->sync.len = READ_ONCE(sqe->len); | |
c992fe29 CH |
5222 | return 0; |
5223 | } | |
5224 | ||
45d189c6 | 5225 | static int io_fsync(struct io_kiocb *req, unsigned int issue_flags) |
8ed8d3c3 | 5226 | { |
8ed8d3c3 | 5227 | loff_t end = req->sync.off + req->sync.len; |
8ed8d3c3 JA |
5228 | int ret; |
5229 | ||
ac45abc0 | 5230 | /* fsync always requires a blocking context */ |
45d189c6 | 5231 | if (issue_flags & IO_URING_F_NONBLOCK) |
ac45abc0 PB |
5232 | return -EAGAIN; |
5233 | ||
9adbd45d | 5234 | ret = vfs_fsync_range(req->file, req->sync.off, |
8ed8d3c3 JA |
5235 | end > 0 ? end : LLONG_MAX, |
5236 | req->sync.flags & IORING_FSYNC_DATASYNC); | |
5237 | if (ret < 0) | |
93d2bcd2 | 5238 | req_set_fail(req); |
e1e16097 | 5239 | io_req_complete(req, ret); |
c992fe29 CH |
5240 | return 0; |
5241 | } | |
5242 | ||
d63d1b5e JA |
5243 | static int io_fallocate_prep(struct io_kiocb *req, |
5244 | const struct io_uring_sqe *sqe) | |
5245 | { | |
73911426 | 5246 | if (sqe->buf_index || sqe->rw_flags || sqe->splice_fd_in) |
3232dd02 | 5247 | return -EINVAL; |
d63d1b5e JA |
5248 | |
5249 | req->sync.off = READ_ONCE(sqe->off); | |
5250 | req->sync.len = READ_ONCE(sqe->addr); | |
5251 | req->sync.mode = READ_ONCE(sqe->len); | |
5252 | return 0; | |
5253 | } | |
5254 | ||
45d189c6 | 5255 | static int io_fallocate(struct io_kiocb *req, unsigned int issue_flags) |
5d17b4a4 | 5256 | { |
ac45abc0 PB |
5257 | int ret; |
5258 | ||
d63d1b5e | 5259 | /* fallocate always requiring blocking context */ |
45d189c6 | 5260 | if (issue_flags & IO_URING_F_NONBLOCK) |
5d17b4a4 | 5261 | return -EAGAIN; |
ac45abc0 PB |
5262 | ret = vfs_fallocate(req->file, req->sync.mode, req->sync.off, |
5263 | req->sync.len); | |
ac45abc0 | 5264 | if (ret < 0) |
93d2bcd2 | 5265 | req_set_fail(req); |
f63cf519 JA |
5266 | else |
5267 | fsnotify_modify(req->file); | |
e1e16097 | 5268 | io_req_complete(req, ret); |
5d17b4a4 JA |
5269 | return 0; |
5270 | } | |
5271 | ||
ec65fea5 | 5272 | static int __io_openat_prep(struct io_kiocb *req, const struct io_uring_sqe *sqe) |
b7bb4f7d | 5273 | { |
f8748881 | 5274 | const char __user *fname; |
15b71abe | 5275 | int ret; |
b7bb4f7d | 5276 | |
73911426 | 5277 | if (unlikely(sqe->buf_index)) |
15b71abe | 5278 | return -EINVAL; |
ec65fea5 | 5279 | if (unlikely(req->flags & REQ_F_FIXED_FILE)) |
cf3040ca | 5280 | return -EBADF; |
03b1230c | 5281 | |
ec65fea5 PB |
5282 | /* open.how should be already initialised */ |
5283 | if (!(req->open.how.flags & O_PATH) && force_o_largefile()) | |
08a1d26e | 5284 | req->open.how.flags |= O_LARGEFILE; |
3529d8c2 | 5285 | |
25e72d10 PB |
5286 | req->open.dfd = READ_ONCE(sqe->fd); |
5287 | fname = u64_to_user_ptr(READ_ONCE(sqe->addr)); | |
f8748881 | 5288 | req->open.filename = getname(fname); |
15b71abe JA |
5289 | if (IS_ERR(req->open.filename)) { |
5290 | ret = PTR_ERR(req->open.filename); | |
5291 | req->open.filename = NULL; | |
5292 | return ret; | |
5293 | } | |
b9445598 PB |
5294 | |
5295 | req->open.file_slot = READ_ONCE(sqe->file_index); | |
5296 | if (req->open.file_slot && (req->open.how.flags & O_CLOEXEC)) | |
5297 | return -EINVAL; | |
5298 | ||
4022e7af | 5299 | req->open.nofile = rlimit(RLIMIT_NOFILE); |
8fef80bf | 5300 | req->flags |= REQ_F_NEED_CLEANUP; |
15b71abe | 5301 | return 0; |
03b1230c JA |
5302 | } |
5303 | ||
ec65fea5 PB |
5304 | static int io_openat_prep(struct io_kiocb *req, const struct io_uring_sqe *sqe) |
5305 | { | |
d3fddf6d PB |
5306 | u64 mode = READ_ONCE(sqe->len); |
5307 | u64 flags = READ_ONCE(sqe->open_flags); | |
ec65fea5 | 5308 | |
ec65fea5 PB |
5309 | req->open.how = build_open_how(flags, mode); |
5310 | return __io_openat_prep(req, sqe); | |
5311 | } | |
5312 | ||
cebdb986 | 5313 | static int io_openat2_prep(struct io_kiocb *req, const struct io_uring_sqe *sqe) |
aa1fa28f | 5314 | { |
cebdb986 | 5315 | struct open_how __user *how; |
cebdb986 | 5316 | size_t len; |
0fa03c62 JA |
5317 | int ret; |
5318 | ||
cebdb986 JA |
5319 | how = u64_to_user_ptr(READ_ONCE(sqe->addr2)); |
5320 | len = READ_ONCE(sqe->len); | |
cebdb986 JA |
5321 | if (len < OPEN_HOW_SIZE_VER0) |
5322 | return -EINVAL; | |
3529d8c2 | 5323 | |
cebdb986 JA |
5324 | ret = copy_struct_from_user(&req->open.how, sizeof(req->open.how), how, |
5325 | len); | |
5326 | if (ret) | |
5327 | return ret; | |
3529d8c2 | 5328 | |
ec65fea5 | 5329 | return __io_openat_prep(req, sqe); |
cebdb986 JA |
5330 | } |
5331 | ||
45d189c6 | 5332 | static int io_openat2(struct io_kiocb *req, unsigned int issue_flags) |
15b71abe JA |
5333 | { |
5334 | struct open_flags op; | |
15b71abe | 5335 | struct file *file; |
b9445598 PB |
5336 | bool resolve_nonblock, nonblock_set; |
5337 | bool fixed = !!req->open.file_slot; | |
15b71abe JA |
5338 | int ret; |
5339 | ||
cebdb986 | 5340 | ret = build_open_flags(&req->open.how, &op); |
15b71abe JA |
5341 | if (ret) |
5342 | goto err; | |
3a81fd02 JA |
5343 | nonblock_set = op.open_flag & O_NONBLOCK; |
5344 | resolve_nonblock = req->open.how.resolve & RESOLVE_CACHED; | |
45d189c6 | 5345 | if (issue_flags & IO_URING_F_NONBLOCK) { |
3a81fd02 JA |
5346 | /* |
5347 | * Don't bother trying for O_TRUNC, O_CREAT, or O_TMPFILE open, | |
5348 | * it'll always -EAGAIN | |
5349 | */ | |
5350 | if (req->open.how.flags & (O_TRUNC | O_CREAT | O_TMPFILE)) | |
5351 | return -EAGAIN; | |
5352 | op.lookup_flags |= LOOKUP_CACHED; | |
5353 | op.open_flag |= O_NONBLOCK; | |
5354 | } | |
15b71abe | 5355 | |
b9445598 PB |
5356 | if (!fixed) { |
5357 | ret = __get_unused_fd_flags(req->open.how.flags, req->open.nofile); | |
5358 | if (ret < 0) | |
5359 | goto err; | |
5360 | } | |
15b71abe JA |
5361 | |
5362 | file = do_filp_open(req->open.dfd, req->open.filename, &op); | |
12dcb58a | 5363 | if (IS_ERR(file)) { |
944d1444 | 5364 | /* |
12dcb58a PB |
5365 | * We could hang on to this 'fd' on retrying, but seems like |
5366 | * marginal gain for something that is now known to be a slower | |
5367 | * path. So just put it, and we'll get a new one when we retry. | |
944d1444 | 5368 | */ |
b9445598 PB |
5369 | if (!fixed) |
5370 | put_unused_fd(ret); | |
3a81fd02 | 5371 | |
15b71abe | 5372 | ret = PTR_ERR(file); |
12dcb58a PB |
5373 | /* only retry if RESOLVE_CACHED wasn't already set by application */ |
5374 | if (ret == -EAGAIN && | |
5375 | (!resolve_nonblock && (issue_flags & IO_URING_F_NONBLOCK))) | |
5376 | return -EAGAIN; | |
5377 | goto err; | |
15b71abe | 5378 | } |
12dcb58a PB |
5379 | |
5380 | if ((issue_flags & IO_URING_F_NONBLOCK) && !nonblock_set) | |
5381 | file->f_flags &= ~O_NONBLOCK; | |
5382 | fsnotify_open(file); | |
b9445598 PB |
5383 | |
5384 | if (!fixed) | |
5385 | fd_install(ret, file); | |
5386 | else | |
5387 | ret = io_install_fixed_file(req, file, issue_flags, | |
5388 | req->open.file_slot - 1); | |
15b71abe JA |
5389 | err: |
5390 | putname(req->open.filename); | |
8fef80bf | 5391 | req->flags &= ~REQ_F_NEED_CLEANUP; |
15b71abe | 5392 | if (ret < 0) |
93d2bcd2 | 5393 | req_set_fail(req); |
0bdf3398 | 5394 | __io_req_complete(req, issue_flags, ret, 0); |
15b71abe JA |
5395 | return 0; |
5396 | } | |
5397 | ||
45d189c6 | 5398 | static int io_openat(struct io_kiocb *req, unsigned int issue_flags) |
cebdb986 | 5399 | { |
e45cff58 | 5400 | return io_openat2(req, issue_flags); |
cebdb986 JA |
5401 | } |
5402 | ||
067524e9 JA |
5403 | static int io_remove_buffers_prep(struct io_kiocb *req, |
5404 | const struct io_uring_sqe *sqe) | |
5405 | { | |
5406 | struct io_provide_buf *p = &req->pbuf; | |
5407 | u64 tmp; | |
5408 | ||
73911426 | 5409 | if (sqe->rw_flags || sqe->addr || sqe->len || sqe->off || |
26578cda | 5410 | sqe->splice_fd_in) |
067524e9 JA |
5411 | return -EINVAL; |
5412 | ||
5413 | tmp = READ_ONCE(sqe->fd); | |
5414 | if (!tmp || tmp > USHRT_MAX) | |
5415 | return -EINVAL; | |
5416 | ||
5417 | memset(p, 0, sizeof(*p)); | |
5418 | p->nbufs = tmp; | |
5419 | p->bgid = READ_ONCE(sqe->buf_group); | |
5420 | return 0; | |
5421 | } | |
5422 | ||
dbc7d452 JA |
5423 | static int __io_remove_buffers(struct io_ring_ctx *ctx, |
5424 | struct io_buffer_list *bl, unsigned nbufs) | |
067524e9 JA |
5425 | { |
5426 | unsigned i = 0; | |
5427 | ||
5428 | /* shouldn't happen */ | |
5429 | if (!nbufs) | |
5430 | return 0; | |
5431 | ||
5432 | /* the head kbuf is the list itself */ | |
dbc7d452 | 5433 | while (!list_empty(&bl->buf_list)) { |
067524e9 JA |
5434 | struct io_buffer *nxt; |
5435 | ||
dbc7d452 | 5436 | nxt = list_first_entry(&bl->buf_list, struct io_buffer, list); |
067524e9 | 5437 | list_del(&nxt->list); |
067524e9 JA |
5438 | if (++i == nbufs) |
5439 | return i; | |
1d0254e6 | 5440 | cond_resched(); |
067524e9 JA |
5441 | } |
5442 | i++; | |
067524e9 JA |
5443 | |
5444 | return i; | |
5445 | } | |
5446 | ||
889fca73 | 5447 | static int io_remove_buffers(struct io_kiocb *req, unsigned int issue_flags) |
067524e9 JA |
5448 | { |
5449 | struct io_provide_buf *p = &req->pbuf; | |
5450 | struct io_ring_ctx *ctx = req->ctx; | |
dbc7d452 | 5451 | struct io_buffer_list *bl; |
067524e9 | 5452 | int ret = 0; |
067524e9 | 5453 | |
f8929630 | 5454 | io_ring_submit_lock(ctx, issue_flags); |
067524e9 JA |
5455 | |
5456 | ret = -ENOENT; | |
dbc7d452 JA |
5457 | bl = io_buffer_get_list(ctx, p->bgid); |
5458 | if (bl) | |
5459 | ret = __io_remove_buffers(ctx, bl, p->nbufs); | |
067524e9 | 5460 | if (ret < 0) |
93d2bcd2 | 5461 | req_set_fail(req); |
067524e9 | 5462 | |
9fb8cb49 PB |
5463 | /* complete before unlock, IOPOLL may need the lock */ |
5464 | __io_req_complete(req, issue_flags, ret, 0); | |
f8929630 | 5465 | io_ring_submit_unlock(ctx, issue_flags); |
067524e9 JA |
5466 | return 0; |
5467 | } | |
5468 | ||
ddf0322d JA |
5469 | static int io_provide_buffers_prep(struct io_kiocb *req, |
5470 | const struct io_uring_sqe *sqe) | |
5471 | { | |
38134ada | 5472 | unsigned long size, tmp_check; |
ddf0322d JA |
5473 | struct io_provide_buf *p = &req->pbuf; |
5474 | u64 tmp; | |
5475 | ||
73911426 | 5476 | if (sqe->rw_flags || sqe->splice_fd_in) |
ddf0322d JA |
5477 | return -EINVAL; |
5478 | ||
5479 | tmp = READ_ONCE(sqe->fd); | |
5480 | if (!tmp || tmp > USHRT_MAX) | |
5481 | return -E2BIG; | |
5482 | p->nbufs = tmp; | |
5483 | p->addr = READ_ONCE(sqe->addr); | |
5484 | p->len = READ_ONCE(sqe->len); | |
5485 | ||
38134ada PB |
5486 | if (check_mul_overflow((unsigned long)p->len, (unsigned long)p->nbufs, |
5487 | &size)) | |
5488 | return -EOVERFLOW; | |
5489 | if (check_add_overflow((unsigned long)p->addr, size, &tmp_check)) | |
5490 | return -EOVERFLOW; | |
5491 | ||
d81269fe PB |
5492 | size = (unsigned long)p->len * p->nbufs; |
5493 | if (!access_ok(u64_to_user_ptr(p->addr), size)) | |
ddf0322d JA |
5494 | return -EFAULT; |
5495 | ||
5496 | p->bgid = READ_ONCE(sqe->buf_group); | |
5497 | tmp = READ_ONCE(sqe->off); | |
5498 | if (tmp > USHRT_MAX) | |
5499 | return -E2BIG; | |
5500 | p->bid = tmp; | |
5501 | return 0; | |
5502 | } | |
5503 | ||
cc3cec83 JA |
5504 | static int io_refill_buffer_cache(struct io_ring_ctx *ctx) |
5505 | { | |
5506 | struct io_buffer *buf; | |
5507 | struct page *page; | |
5508 | int bufs_in_page; | |
5509 | ||
5510 | /* | |
5511 | * Completions that don't happen inline (eg not under uring_lock) will | |
5512 | * add to ->io_buffers_comp. If we don't have any free buffers, check | |
5513 | * the completion list and splice those entries first. | |
5514 | */ | |
5515 | if (!list_empty_careful(&ctx->io_buffers_comp)) { | |
5516 | spin_lock(&ctx->completion_lock); | |
5517 | if (!list_empty(&ctx->io_buffers_comp)) { | |
5518 | list_splice_init(&ctx->io_buffers_comp, | |
5519 | &ctx->io_buffers_cache); | |
5520 | spin_unlock(&ctx->completion_lock); | |
5521 | return 0; | |
5522 | } | |
5523 | spin_unlock(&ctx->completion_lock); | |
5524 | } | |
5525 | ||
5526 | /* | |
5527 | * No free buffers and no completion entries either. Allocate a new | |
5528 | * page worth of buffer entries and add those to our freelist. | |
5529 | */ | |
5530 | page = alloc_page(GFP_KERNEL_ACCOUNT); | |
5531 | if (!page) | |
5532 | return -ENOMEM; | |
5533 | ||
5534 | list_add(&page->lru, &ctx->io_buffers_pages); | |
5535 | ||
5536 | buf = page_address(page); | |
5537 | bufs_in_page = PAGE_SIZE / sizeof(*buf); | |
5538 | while (bufs_in_page) { | |
5539 | list_add_tail(&buf->list, &ctx->io_buffers_cache); | |
5540 | buf++; | |
5541 | bufs_in_page--; | |
5542 | } | |
5543 | ||
5544 | return 0; | |
5545 | } | |
5546 | ||
5547 | static int io_add_buffers(struct io_ring_ctx *ctx, struct io_provide_buf *pbuf, | |
dbc7d452 | 5548 | struct io_buffer_list *bl) |
ddf0322d JA |
5549 | { |
5550 | struct io_buffer *buf; | |
5551 | u64 addr = pbuf->addr; | |
5552 | int i, bid = pbuf->bid; | |
5553 | ||
5554 | for (i = 0; i < pbuf->nbufs; i++) { | |
cc3cec83 JA |
5555 | if (list_empty(&ctx->io_buffers_cache) && |
5556 | io_refill_buffer_cache(ctx)) | |
ddf0322d | 5557 | break; |
cc3cec83 JA |
5558 | buf = list_first_entry(&ctx->io_buffers_cache, struct io_buffer, |
5559 | list); | |
dbc7d452 | 5560 | list_move_tail(&buf->list, &bl->buf_list); |
ddf0322d | 5561 | buf->addr = addr; |
d1f82808 | 5562 | buf->len = min_t(__u32, pbuf->len, MAX_RW_COUNT); |
ddf0322d | 5563 | buf->bid = bid; |
b1c62645 | 5564 | buf->bgid = pbuf->bgid; |
ddf0322d JA |
5565 | addr += pbuf->len; |
5566 | bid++; | |
f240762f | 5567 | cond_resched(); |
ddf0322d JA |
5568 | } |
5569 | ||
dbc7d452 | 5570 | return i ? 0 : -ENOMEM; |
ddf0322d JA |
5571 | } |
5572 | ||
9cfc7e94 JA |
5573 | static __cold int io_init_bl_list(struct io_ring_ctx *ctx) |
5574 | { | |
5575 | int i; | |
5576 | ||
5577 | ctx->io_bl = kcalloc(BGID_ARRAY, sizeof(struct io_buffer_list), | |
5578 | GFP_KERNEL); | |
5579 | if (!ctx->io_bl) | |
5580 | return -ENOMEM; | |
5581 | ||
5582 | for (i = 0; i < BGID_ARRAY; i++) { | |
5583 | INIT_LIST_HEAD(&ctx->io_bl[i].buf_list); | |
5584 | ctx->io_bl[i].bgid = i; | |
5585 | } | |
5586 | ||
5587 | return 0; | |
5588 | } | |
5589 | ||
889fca73 | 5590 | static int io_provide_buffers(struct io_kiocb *req, unsigned int issue_flags) |
ddf0322d JA |
5591 | { |
5592 | struct io_provide_buf *p = &req->pbuf; | |
5593 | struct io_ring_ctx *ctx = req->ctx; | |
dbc7d452 | 5594 | struct io_buffer_list *bl; |
ddf0322d JA |
5595 | int ret = 0; |
5596 | ||
f8929630 | 5597 | io_ring_submit_lock(ctx, issue_flags); |
ddf0322d | 5598 | |
9cfc7e94 JA |
5599 | if (unlikely(p->bgid < BGID_ARRAY && !ctx->io_bl)) { |
5600 | ret = io_init_bl_list(ctx); | |
5601 | if (ret) | |
5602 | goto err; | |
5603 | } | |
ddf0322d | 5604 | |
dbc7d452 JA |
5605 | bl = io_buffer_get_list(ctx, p->bgid); |
5606 | if (unlikely(!bl)) { | |
5607 | bl = kmalloc(sizeof(*bl), GFP_KERNEL); | |
5608 | if (!bl) { | |
5609 | ret = -ENOMEM; | |
5610 | goto err; | |
5611 | } | |
9cfc7e94 JA |
5612 | ret = io_buffer_add_list(ctx, bl, p->bgid); |
5613 | if (ret) { | |
5614 | kfree(bl); | |
5615 | goto err; | |
5616 | } | |
ddf0322d | 5617 | } |
dbc7d452 JA |
5618 | |
5619 | ret = io_add_buffers(ctx, p, bl); | |
5620 | err: | |
ddf0322d | 5621 | if (ret < 0) |
93d2bcd2 | 5622 | req_set_fail(req); |
9fb8cb49 PB |
5623 | /* complete before unlock, IOPOLL may need the lock */ |
5624 | __io_req_complete(req, issue_flags, ret, 0); | |
f8929630 | 5625 | io_ring_submit_unlock(ctx, issue_flags); |
ddf0322d | 5626 | return 0; |
cebdb986 JA |
5627 | } |
5628 | ||
3e4827b0 JA |
5629 | static int io_epoll_ctl_prep(struct io_kiocb *req, |
5630 | const struct io_uring_sqe *sqe) | |
5631 | { | |
5632 | #if defined(CONFIG_EPOLL) | |
73911426 | 5633 | if (sqe->buf_index || sqe->splice_fd_in) |
3232dd02 | 5634 | return -EINVAL; |
3e4827b0 JA |
5635 | |
5636 | req->epoll.epfd = READ_ONCE(sqe->fd); | |
5637 | req->epoll.op = READ_ONCE(sqe->len); | |
5638 | req->epoll.fd = READ_ONCE(sqe->off); | |
5639 | ||
5640 | if (ep_op_has_event(req->epoll.op)) { | |
5641 | struct epoll_event __user *ev; | |
5642 | ||
5643 | ev = u64_to_user_ptr(READ_ONCE(sqe->addr)); | |
5644 | if (copy_from_user(&req->epoll.event, ev, sizeof(*ev))) | |
5645 | return -EFAULT; | |
5646 | } | |
5647 | ||
5648 | return 0; | |
5649 | #else | |
5650 | return -EOPNOTSUPP; | |
5651 | #endif | |
5652 | } | |
5653 | ||
889fca73 | 5654 | static int io_epoll_ctl(struct io_kiocb *req, unsigned int issue_flags) |
3e4827b0 JA |
5655 | { |
5656 | #if defined(CONFIG_EPOLL) | |
5657 | struct io_epoll *ie = &req->epoll; | |
5658 | int ret; | |
45d189c6 | 5659 | bool force_nonblock = issue_flags & IO_URING_F_NONBLOCK; |
3e4827b0 JA |
5660 | |
5661 | ret = do_epoll_ctl(ie->epfd, ie->op, ie->fd, &ie->event, force_nonblock); | |
5662 | if (force_nonblock && ret == -EAGAIN) | |
5663 | return -EAGAIN; | |
5664 | ||
5665 | if (ret < 0) | |
93d2bcd2 | 5666 | req_set_fail(req); |
889fca73 | 5667 | __io_req_complete(req, issue_flags, ret, 0); |
3e4827b0 JA |
5668 | return 0; |
5669 | #else | |
5670 | return -EOPNOTSUPP; | |
5671 | #endif | |
5672 | } | |
5673 | ||
c1ca757b JA |
5674 | static int io_madvise_prep(struct io_kiocb *req, const struct io_uring_sqe *sqe) |
5675 | { | |
5676 | #if defined(CONFIG_ADVISE_SYSCALLS) && defined(CONFIG_MMU) | |
73911426 | 5677 | if (sqe->buf_index || sqe->off || sqe->splice_fd_in) |
3232dd02 | 5678 | return -EINVAL; |
c1ca757b JA |
5679 | |
5680 | req->madvise.addr = READ_ONCE(sqe->addr); | |
5681 | req->madvise.len = READ_ONCE(sqe->len); | |
5682 | req->madvise.advice = READ_ONCE(sqe->fadvise_advice); | |
5683 | return 0; | |
5684 | #else | |
5685 | return -EOPNOTSUPP; | |
5686 | #endif | |
5687 | } | |
5688 | ||
45d189c6 | 5689 | static int io_madvise(struct io_kiocb *req, unsigned int issue_flags) |
c1ca757b JA |
5690 | { |
5691 | #if defined(CONFIG_ADVISE_SYSCALLS) && defined(CONFIG_MMU) | |
5692 | struct io_madvise *ma = &req->madvise; | |
5693 | int ret; | |
5694 | ||
45d189c6 | 5695 | if (issue_flags & IO_URING_F_NONBLOCK) |
c1ca757b JA |
5696 | return -EAGAIN; |
5697 | ||
0726b01e | 5698 | ret = do_madvise(current->mm, ma->addr, ma->len, ma->advice); |
c1ca757b | 5699 | if (ret < 0) |
93d2bcd2 | 5700 | req_set_fail(req); |
e1e16097 | 5701 | io_req_complete(req, ret); |
c1ca757b JA |
5702 | return 0; |
5703 | #else | |
5704 | return -EOPNOTSUPP; | |
5705 | #endif | |
5706 | } | |
5707 | ||
4840e418 JA |
5708 | static int io_fadvise_prep(struct io_kiocb *req, const struct io_uring_sqe *sqe) |
5709 | { | |
73911426 | 5710 | if (sqe->buf_index || sqe->addr || sqe->splice_fd_in) |
3232dd02 | 5711 | return -EINVAL; |
4840e418 JA |
5712 | |
5713 | req->fadvise.offset = READ_ONCE(sqe->off); | |
5714 | req->fadvise.len = READ_ONCE(sqe->len); | |
5715 | req->fadvise.advice = READ_ONCE(sqe->fadvise_advice); | |
5716 | return 0; | |
5717 | } | |
5718 | ||
45d189c6 | 5719 | static int io_fadvise(struct io_kiocb *req, unsigned int issue_flags) |
4840e418 JA |
5720 | { |
5721 | struct io_fadvise *fa = &req->fadvise; | |
5722 | int ret; | |
5723 | ||
45d189c6 | 5724 | if (issue_flags & IO_URING_F_NONBLOCK) { |
3e69426d JA |
5725 | switch (fa->advice) { |
5726 | case POSIX_FADV_NORMAL: | |
5727 | case POSIX_FADV_RANDOM: | |
5728 | case POSIX_FADV_SEQUENTIAL: | |
5729 | break; | |
5730 | default: | |
5731 | return -EAGAIN; | |
5732 | } | |
5733 | } | |
4840e418 JA |
5734 | |
5735 | ret = vfs_fadvise(req->file, fa->offset, fa->len, fa->advice); | |
5736 | if (ret < 0) | |
93d2bcd2 | 5737 | req_set_fail(req); |
0bdf3398 | 5738 | __io_req_complete(req, issue_flags, ret, 0); |
4840e418 JA |
5739 | return 0; |
5740 | } | |
5741 | ||
eddc7ef5 JA |
5742 | static int io_statx_prep(struct io_kiocb *req, const struct io_uring_sqe *sqe) |
5743 | { | |
1b6fe6e0 SR |
5744 | const char __user *path; |
5745 | ||
73911426 | 5746 | if (sqe->buf_index || sqe->splice_fd_in) |
eddc7ef5 | 5747 | return -EINVAL; |
9c280f90 | 5748 | if (req->flags & REQ_F_FIXED_FILE) |
cf3040ca | 5749 | return -EBADF; |
eddc7ef5 | 5750 | |
1d9e1288 BM |
5751 | req->statx.dfd = READ_ONCE(sqe->fd); |
5752 | req->statx.mask = READ_ONCE(sqe->len); | |
1b6fe6e0 | 5753 | path = u64_to_user_ptr(READ_ONCE(sqe->addr)); |
1d9e1288 BM |
5754 | req->statx.buffer = u64_to_user_ptr(READ_ONCE(sqe->addr2)); |
5755 | req->statx.flags = READ_ONCE(sqe->statx_flags); | |
eddc7ef5 | 5756 | |
1b6fe6e0 SR |
5757 | req->statx.filename = getname_flags(path, |
5758 | getname_statx_lookup_flags(req->statx.flags), | |
5759 | NULL); | |
5760 | ||
5761 | if (IS_ERR(req->statx.filename)) { | |
5762 | int ret = PTR_ERR(req->statx.filename); | |
5763 | ||
5764 | req->statx.filename = NULL; | |
5765 | return ret; | |
5766 | } | |
5767 | ||
5768 | req->flags |= REQ_F_NEED_CLEANUP; | |
eddc7ef5 JA |
5769 | return 0; |
5770 | } | |
5771 | ||
45d189c6 | 5772 | static int io_statx(struct io_kiocb *req, unsigned int issue_flags) |
eddc7ef5 | 5773 | { |
1d9e1288 | 5774 | struct io_statx *ctx = &req->statx; |
eddc7ef5 JA |
5775 | int ret; |
5776 | ||
59d70013 | 5777 | if (issue_flags & IO_URING_F_NONBLOCK) |
eddc7ef5 JA |
5778 | return -EAGAIN; |
5779 | ||
e62753e4 BM |
5780 | ret = do_statx(ctx->dfd, ctx->filename, ctx->flags, ctx->mask, |
5781 | ctx->buffer); | |
eddc7ef5 | 5782 | |
eddc7ef5 | 5783 | if (ret < 0) |
93d2bcd2 | 5784 | req_set_fail(req); |
e1e16097 | 5785 | io_req_complete(req, ret); |
eddc7ef5 JA |
5786 | return 0; |
5787 | } | |
5788 | ||
b5dba59e JA |
5789 | static int io_close_prep(struct io_kiocb *req, const struct io_uring_sqe *sqe) |
5790 | { | |
73911426 | 5791 | if (sqe->off || sqe->addr || sqe->len || sqe->rw_flags || sqe->buf_index) |
b5dba59e | 5792 | return -EINVAL; |
9c280f90 | 5793 | if (req->flags & REQ_F_FIXED_FILE) |
cf3040ca | 5794 | return -EBADF; |
b5dba59e JA |
5795 | |
5796 | req->close.fd = READ_ONCE(sqe->fd); | |
7df778be PB |
5797 | req->close.file_slot = READ_ONCE(sqe->file_index); |
5798 | if (req->close.file_slot && req->close.fd) | |
5799 | return -EINVAL; | |
5800 | ||
b5dba59e | 5801 | return 0; |
b5dba59e JA |
5802 | } |
5803 | ||
889fca73 | 5804 | static int io_close(struct io_kiocb *req, unsigned int issue_flags) |
b5dba59e | 5805 | { |
9eac1904 | 5806 | struct files_struct *files = current->files; |
3af73b28 | 5807 | struct io_close *close = &req->close; |
9eac1904 | 5808 | struct fdtable *fdt; |
a1fde923 PB |
5809 | struct file *file = NULL; |
5810 | int ret = -EBADF; | |
b5dba59e | 5811 | |
7df778be PB |
5812 | if (req->close.file_slot) { |
5813 | ret = io_close_fixed(req, issue_flags); | |
5814 | goto err; | |
5815 | } | |
5816 | ||
9eac1904 JA |
5817 | spin_lock(&files->file_lock); |
5818 | fdt = files_fdtable(files); | |
5819 | if (close->fd >= fdt->max_fds) { | |
5820 | spin_unlock(&files->file_lock); | |
5821 | goto err; | |
5822 | } | |
5823 | file = fdt->fd[close->fd]; | |
a1fde923 | 5824 | if (!file || file->f_op == &io_uring_fops) { |
9eac1904 JA |
5825 | spin_unlock(&files->file_lock); |
5826 | file = NULL; | |
5827 | goto err; | |
3af73b28 | 5828 | } |
b5dba59e JA |
5829 | |
5830 | /* if the file has a flush method, be safe and punt to async */ | |
45d189c6 | 5831 | if (file->f_op->flush && (issue_flags & IO_URING_F_NONBLOCK)) { |
9eac1904 | 5832 | spin_unlock(&files->file_lock); |
0bf0eefd | 5833 | return -EAGAIN; |
a2100672 | 5834 | } |
b5dba59e | 5835 | |
9eac1904 JA |
5836 | ret = __close_fd_get_file(close->fd, &file); |
5837 | spin_unlock(&files->file_lock); | |
5838 | if (ret < 0) { | |
5839 | if (ret == -ENOENT) | |
5840 | ret = -EBADF; | |
5841 | goto err; | |
5842 | } | |
5843 | ||
3af73b28 | 5844 | /* No ->flush() or already async, safely close from here */ |
9eac1904 JA |
5845 | ret = filp_close(file, current->files); |
5846 | err: | |
3af73b28 | 5847 | if (ret < 0) |
93d2bcd2 | 5848 | req_set_fail(req); |
9eac1904 JA |
5849 | if (file) |
5850 | fput(file); | |
889fca73 | 5851 | __io_req_complete(req, issue_flags, ret, 0); |
1a417f4e | 5852 | return 0; |
b5dba59e JA |
5853 | } |
5854 | ||
1155c76a | 5855 | static int io_sfr_prep(struct io_kiocb *req, const struct io_uring_sqe *sqe) |
5d17b4a4 | 5856 | { |
73911426 | 5857 | if (unlikely(sqe->addr || sqe->buf_index || sqe->splice_fd_in)) |
5d17b4a4 JA |
5858 | return -EINVAL; |
5859 | ||
8ed8d3c3 JA |
5860 | req->sync.off = READ_ONCE(sqe->off); |
5861 | req->sync.len = READ_ONCE(sqe->len); | |
5862 | req->sync.flags = READ_ONCE(sqe->sync_range_flags); | |
8ed8d3c3 JA |
5863 | return 0; |
5864 | } | |
5865 | ||
45d189c6 | 5866 | static int io_sync_file_range(struct io_kiocb *req, unsigned int issue_flags) |
8ed8d3c3 | 5867 | { |
8ed8d3c3 JA |
5868 | int ret; |
5869 | ||
ac45abc0 | 5870 | /* sync_file_range always requires a blocking context */ |
45d189c6 | 5871 | if (issue_flags & IO_URING_F_NONBLOCK) |
ac45abc0 PB |
5872 | return -EAGAIN; |
5873 | ||
9adbd45d | 5874 | ret = sync_file_range(req->file, req->sync.off, req->sync.len, |
8ed8d3c3 JA |
5875 | req->sync.flags); |
5876 | if (ret < 0) | |
93d2bcd2 | 5877 | req_set_fail(req); |
e1e16097 | 5878 | io_req_complete(req, ret); |
5d17b4a4 JA |
5879 | return 0; |
5880 | } | |
5881 | ||
469956e8 | 5882 | #if defined(CONFIG_NET) |
4c3c0943 JA |
5883 | static bool io_net_retry(struct socket *sock, int flags) |
5884 | { | |
5885 | if (!(flags & MSG_WAITALL)) | |
5886 | return false; | |
5887 | return sock->type == SOCK_STREAM || sock->type == SOCK_SEQPACKET; | |
5888 | } | |
5889 | ||
02d27d89 PB |
5890 | static int io_setup_async_msg(struct io_kiocb *req, |
5891 | struct io_async_msghdr *kmsg) | |
5892 | { | |
e8c2bc1f JA |
5893 | struct io_async_msghdr *async_msg = req->async_data; |
5894 | ||
5895 | if (async_msg) | |
02d27d89 | 5896 | return -EAGAIN; |
e8c2bc1f | 5897 | if (io_alloc_async_data(req)) { |
257e84a5 | 5898 | kfree(kmsg->free_iov); |
02d27d89 PB |
5899 | return -ENOMEM; |
5900 | } | |
e8c2bc1f | 5901 | async_msg = req->async_data; |
02d27d89 | 5902 | req->flags |= REQ_F_NEED_CLEANUP; |
e8c2bc1f | 5903 | memcpy(async_msg, kmsg, sizeof(*kmsg)); |
2a780802 | 5904 | async_msg->msg.msg_name = &async_msg->addr; |
257e84a5 PB |
5905 | /* if were using fast_iov, set it to the new one */ |
5906 | if (!async_msg->free_iov) | |
5907 | async_msg->msg.msg_iter.iov = async_msg->fast_iov; | |
5908 | ||
02d27d89 PB |
5909 | return -EAGAIN; |
5910 | } | |
5911 | ||
2ae523ed PB |
5912 | static int io_sendmsg_copy_hdr(struct io_kiocb *req, |
5913 | struct io_async_msghdr *iomsg) | |
5914 | { | |
2ae523ed | 5915 | iomsg->msg.msg_name = &iomsg->addr; |
257e84a5 | 5916 | iomsg->free_iov = iomsg->fast_iov; |
2ae523ed | 5917 | return sendmsg_copy_msghdr(&iomsg->msg, req->sr_msg.umsg, |
257e84a5 | 5918 | req->sr_msg.msg_flags, &iomsg->free_iov); |
2ae523ed PB |
5919 | } |
5920 | ||
93642ef8 PB |
5921 | static int io_sendmsg_prep_async(struct io_kiocb *req) |
5922 | { | |
5923 | int ret; | |
5924 | ||
93642ef8 PB |
5925 | ret = io_sendmsg_copy_hdr(req, req->async_data); |
5926 | if (!ret) | |
5927 | req->flags |= REQ_F_NEED_CLEANUP; | |
5928 | return ret; | |
5929 | } | |
5930 | ||
3529d8c2 | 5931 | static int io_sendmsg_prep(struct io_kiocb *req, const struct io_uring_sqe *sqe) |
03b1230c | 5932 | { |
e47293fd | 5933 | struct io_sr_msg *sr = &req->sr_msg; |
03b1230c | 5934 | |
0455d4cc | 5935 | if (unlikely(sqe->file_index)) |
d2b6f48b | 5936 | return -EINVAL; |
588faa1e JA |
5937 | if (unlikely(sqe->addr2 || sqe->file_index)) |
5938 | return -EINVAL; | |
d2b6f48b | 5939 | |
270a5940 | 5940 | sr->umsg = u64_to_user_ptr(READ_ONCE(sqe->addr)); |
fddaface | 5941 | sr->len = READ_ONCE(sqe->len); |
0455d4cc JA |
5942 | sr->flags = READ_ONCE(sqe->addr2); |
5943 | if (sr->flags & ~IORING_RECVSEND_POLL_FIRST) | |
5944 | return -EINVAL; | |
04411806 PB |
5945 | sr->msg_flags = READ_ONCE(sqe->msg_flags) | MSG_NOSIGNAL; |
5946 | if (sr->msg_flags & MSG_DONTWAIT) | |
5947 | req->flags |= REQ_F_NOWAIT; | |
3529d8c2 | 5948 | |
d8768362 JA |
5949 | #ifdef CONFIG_COMPAT |
5950 | if (req->ctx->compat) | |
5951 | sr->msg_flags |= MSG_CMSG_COMPAT; | |
5952 | #endif | |
4c3c0943 | 5953 | sr->done_io = 0; |
93642ef8 | 5954 | return 0; |
03b1230c JA |
5955 | } |
5956 | ||
889fca73 | 5957 | static int io_sendmsg(struct io_kiocb *req, unsigned int issue_flags) |
aa1fa28f | 5958 | { |
6b754c8b | 5959 | struct io_async_msghdr iomsg, *kmsg; |
4c3c0943 | 5960 | struct io_sr_msg *sr = &req->sr_msg; |
0fa03c62 | 5961 | struct socket *sock; |
7a7cacba | 5962 | unsigned flags; |
0031275d | 5963 | int min_ret = 0; |
0fa03c62 JA |
5964 | int ret; |
5965 | ||
dba4a925 | 5966 | sock = sock_from_file(req->file); |
7a7cacba | 5967 | if (unlikely(!sock)) |
dba4a925 | 5968 | return -ENOTSOCK; |
3529d8c2 | 5969 | |
d886e185 PB |
5970 | if (req_has_async_data(req)) { |
5971 | kmsg = req->async_data; | |
5972 | } else { | |
7a7cacba PB |
5973 | ret = io_sendmsg_copy_hdr(req, &iomsg); |
5974 | if (ret) | |
5975 | return ret; | |
5976 | kmsg = &iomsg; | |
0fa03c62 | 5977 | } |
0fa03c62 | 5978 | |
0455d4cc JA |
5979 | if (!(req->flags & REQ_F_POLLED) && |
5980 | (sr->flags & IORING_RECVSEND_POLL_FIRST)) | |
5981 | return io_setup_async_msg(req, kmsg); | |
5982 | ||
0a352aaa | 5983 | flags = sr->msg_flags; |
04411806 | 5984 | if (issue_flags & IO_URING_F_NONBLOCK) |
7a7cacba | 5985 | flags |= MSG_DONTWAIT; |
0031275d SM |
5986 | if (flags & MSG_WAITALL) |
5987 | min_ret = iov_iter_count(&kmsg->msg.msg_iter); | |
5988 | ||
7a7cacba | 5989 | ret = __sys_sendmsg_sock(sock, &kmsg->msg, flags); |
0fa03c62 | 5990 | |
7297ce3d PB |
5991 | if (ret < min_ret) { |
5992 | if (ret == -EAGAIN && (issue_flags & IO_URING_F_NONBLOCK)) | |
5993 | return io_setup_async_msg(req, kmsg); | |
5994 | if (ret == -ERESTARTSYS) | |
5995 | ret = -EINTR; | |
4c3c0943 JA |
5996 | if (ret > 0 && io_net_retry(sock, flags)) { |
5997 | sr->done_io += ret; | |
5998 | req->flags |= REQ_F_PARTIAL_IO; | |
5999 | return io_setup_async_msg(req, kmsg); | |
6000 | } | |
7297ce3d PB |
6001 | req_set_fail(req); |
6002 | } | |
257e84a5 PB |
6003 | /* fast path, check for non-NULL to avoid function call */ |
6004 | if (kmsg->free_iov) | |
6005 | kfree(kmsg->free_iov); | |
99bc4c38 | 6006 | req->flags &= ~REQ_F_NEED_CLEANUP; |
4c3c0943 JA |
6007 | if (ret >= 0) |
6008 | ret += sr->done_io; | |
6009 | else if (sr->done_io) | |
6010 | ret = sr->done_io; | |
889fca73 | 6011 | __io_req_complete(req, issue_flags, ret, 0); |
5d17b4a4 | 6012 | return 0; |
03b1230c | 6013 | } |
aa1fa28f | 6014 | |
889fca73 | 6015 | static int io_send(struct io_kiocb *req, unsigned int issue_flags) |
fddaface | 6016 | { |
7a7cacba PB |
6017 | struct io_sr_msg *sr = &req->sr_msg; |
6018 | struct msghdr msg; | |
6019 | struct iovec iov; | |
fddaface | 6020 | struct socket *sock; |
7a7cacba | 6021 | unsigned flags; |
0031275d | 6022 | int min_ret = 0; |
fddaface JA |
6023 | int ret; |
6024 | ||
0455d4cc JA |
6025 | if (!(req->flags & REQ_F_POLLED) && |
6026 | (sr->flags & IORING_RECVSEND_POLL_FIRST)) | |
6027 | return -EAGAIN; | |
6028 | ||
dba4a925 | 6029 | sock = sock_from_file(req->file); |
7a7cacba | 6030 | if (unlikely(!sock)) |
dba4a925 | 6031 | return -ENOTSOCK; |
fddaface | 6032 | |
7a7cacba PB |
6033 | ret = import_single_range(WRITE, sr->buf, sr->len, &iov, &msg.msg_iter); |
6034 | if (unlikely(ret)) | |
14db8411 | 6035 | return ret; |
fddaface | 6036 | |
7a7cacba PB |
6037 | msg.msg_name = NULL; |
6038 | msg.msg_control = NULL; | |
6039 | msg.msg_controllen = 0; | |
6040 | msg.msg_namelen = 0; | |
fddaface | 6041 | |
0a352aaa | 6042 | flags = sr->msg_flags; |
04411806 | 6043 | if (issue_flags & IO_URING_F_NONBLOCK) |
7a7cacba | 6044 | flags |= MSG_DONTWAIT; |
0031275d SM |
6045 | if (flags & MSG_WAITALL) |
6046 | min_ret = iov_iter_count(&msg.msg_iter); | |
6047 | ||
7a7cacba PB |
6048 | msg.msg_flags = flags; |
6049 | ret = sock_sendmsg(sock, &msg); | |
7297ce3d PB |
6050 | if (ret < min_ret) { |
6051 | if (ret == -EAGAIN && (issue_flags & IO_URING_F_NONBLOCK)) | |
6052 | return -EAGAIN; | |
6053 | if (ret == -ERESTARTSYS) | |
6054 | ret = -EINTR; | |
4c3c0943 JA |
6055 | if (ret > 0 && io_net_retry(sock, flags)) { |
6056 | sr->len -= ret; | |
6057 | sr->buf += ret; | |
6058 | sr->done_io += ret; | |
6059 | req->flags |= REQ_F_PARTIAL_IO; | |
6060 | return -EAGAIN; | |
6061 | } | |
93d2bcd2 | 6062 | req_set_fail(req); |
7297ce3d | 6063 | } |
4c3c0943 JA |
6064 | if (ret >= 0) |
6065 | ret += sr->done_io; | |
6066 | else if (sr->done_io) | |
6067 | ret = sr->done_io; | |
889fca73 | 6068 | __io_req_complete(req, issue_flags, ret, 0); |
fddaface | 6069 | return 0; |
fddaface JA |
6070 | } |
6071 | ||
1400e697 PB |
6072 | static int __io_recvmsg_copy_hdr(struct io_kiocb *req, |
6073 | struct io_async_msghdr *iomsg) | |
52de1fe1 JA |
6074 | { |
6075 | struct io_sr_msg *sr = &req->sr_msg; | |
6076 | struct iovec __user *uiov; | |
6077 | size_t iov_len; | |
6078 | int ret; | |
6079 | ||
1400e697 PB |
6080 | ret = __copy_msghdr_from_user(&iomsg->msg, sr->umsg, |
6081 | &iomsg->uaddr, &uiov, &iov_len); | |
52de1fe1 JA |
6082 | if (ret) |
6083 | return ret; | |
6084 | ||
6085 | if (req->flags & REQ_F_BUFFER_SELECT) { | |
6086 | if (iov_len > 1) | |
6087 | return -EINVAL; | |
5476dfed | 6088 | if (copy_from_user(iomsg->fast_iov, uiov, sizeof(*uiov))) |
52de1fe1 | 6089 | return -EFAULT; |
5476dfed | 6090 | sr->len = iomsg->fast_iov[0].iov_len; |
257e84a5 | 6091 | iomsg->free_iov = NULL; |
52de1fe1 | 6092 | } else { |
257e84a5 | 6093 | iomsg->free_iov = iomsg->fast_iov; |
89cd35c5 | 6094 | ret = __import_iovec(READ, uiov, iov_len, UIO_FASTIOV, |
257e84a5 | 6095 | &iomsg->free_iov, &iomsg->msg.msg_iter, |
89cd35c5 | 6096 | false); |
52de1fe1 JA |
6097 | if (ret > 0) |
6098 | ret = 0; | |
6099 | } | |
6100 | ||
6101 | return ret; | |
6102 | } | |
6103 | ||
6104 | #ifdef CONFIG_COMPAT | |
6105 | static int __io_compat_recvmsg_copy_hdr(struct io_kiocb *req, | |
1400e697 | 6106 | struct io_async_msghdr *iomsg) |
52de1fe1 | 6107 | { |
52de1fe1 JA |
6108 | struct io_sr_msg *sr = &req->sr_msg; |
6109 | struct compat_iovec __user *uiov; | |
6110 | compat_uptr_t ptr; | |
6111 | compat_size_t len; | |
6112 | int ret; | |
6113 | ||
4af3417a PB |
6114 | ret = __get_compat_msghdr(&iomsg->msg, sr->umsg_compat, &iomsg->uaddr, |
6115 | &ptr, &len); | |
52de1fe1 JA |
6116 | if (ret) |
6117 | return ret; | |
6118 | ||
6119 | uiov = compat_ptr(ptr); | |
6120 | if (req->flags & REQ_F_BUFFER_SELECT) { | |
6121 | compat_ssize_t clen; | |
6122 | ||
6123 | if (len > 1) | |
6124 | return -EINVAL; | |
6125 | if (!access_ok(uiov, sizeof(*uiov))) | |
6126 | return -EFAULT; | |
6127 | if (__get_user(clen, &uiov->iov_len)) | |
6128 | return -EFAULT; | |
6129 | if (clen < 0) | |
6130 | return -EINVAL; | |
2d280bc8 | 6131 | sr->len = clen; |
257e84a5 | 6132 | iomsg->free_iov = NULL; |
52de1fe1 | 6133 | } else { |
257e84a5 | 6134 | iomsg->free_iov = iomsg->fast_iov; |
89cd35c5 | 6135 | ret = __import_iovec(READ, (struct iovec __user *)uiov, len, |
257e84a5 | 6136 | UIO_FASTIOV, &iomsg->free_iov, |
89cd35c5 | 6137 | &iomsg->msg.msg_iter, true); |
52de1fe1 JA |
6138 | if (ret < 0) |
6139 | return ret; | |
6140 | } | |
6141 | ||
6142 | return 0; | |
6143 | } | |
6144 | #endif | |
6145 | ||
1400e697 PB |
6146 | static int io_recvmsg_copy_hdr(struct io_kiocb *req, |
6147 | struct io_async_msghdr *iomsg) | |
52de1fe1 | 6148 | { |
1400e697 | 6149 | iomsg->msg.msg_name = &iomsg->addr; |
52de1fe1 JA |
6150 | |
6151 | #ifdef CONFIG_COMPAT | |
6152 | if (req->ctx->compat) | |
1400e697 | 6153 | return __io_compat_recvmsg_copy_hdr(req, iomsg); |
fddaface | 6154 | #endif |
52de1fe1 | 6155 | |
1400e697 | 6156 | return __io_recvmsg_copy_hdr(req, iomsg); |
52de1fe1 JA |
6157 | } |
6158 | ||
93642ef8 | 6159 | static int io_recvmsg_prep_async(struct io_kiocb *req) |
aa1fa28f | 6160 | { |
99bc4c38 | 6161 | int ret; |
3529d8c2 | 6162 | |
93642ef8 PB |
6163 | ret = io_recvmsg_copy_hdr(req, req->async_data); |
6164 | if (!ret) | |
6165 | req->flags |= REQ_F_NEED_CLEANUP; | |
6166 | return ret; | |
6167 | } | |
6168 | ||
6169 | static int io_recvmsg_prep(struct io_kiocb *req, const struct io_uring_sqe *sqe) | |
6170 | { | |
6171 | struct io_sr_msg *sr = &req->sr_msg; | |
6172 | ||
0455d4cc | 6173 | if (unlikely(sqe->file_index)) |
d2b6f48b | 6174 | return -EINVAL; |
5a1e99b6 JA |
6175 | if (unlikely(sqe->addr2 || sqe->file_index)) |
6176 | return -EINVAL; | |
d2b6f48b | 6177 | |
270a5940 | 6178 | sr->umsg = u64_to_user_ptr(READ_ONCE(sqe->addr)); |
0b7b21e4 | 6179 | sr->len = READ_ONCE(sqe->len); |
0455d4cc JA |
6180 | sr->flags = READ_ONCE(sqe->addr2); |
6181 | if (sr->flags & ~IORING_RECVSEND_POLL_FIRST) | |
6182 | return -EINVAL; | |
04411806 PB |
6183 | sr->msg_flags = READ_ONCE(sqe->msg_flags) | MSG_NOSIGNAL; |
6184 | if (sr->msg_flags & MSG_DONTWAIT) | |
6185 | req->flags |= REQ_F_NOWAIT; | |
06b76d44 | 6186 | |
d8768362 JA |
6187 | #ifdef CONFIG_COMPAT |
6188 | if (req->ctx->compat) | |
6189 | sr->msg_flags |= MSG_CMSG_COMPAT; | |
6190 | #endif | |
7ba89d2a | 6191 | sr->done_io = 0; |
93642ef8 | 6192 | return 0; |
aa1fa28f JA |
6193 | } |
6194 | ||
889fca73 | 6195 | static int io_recvmsg(struct io_kiocb *req, unsigned int issue_flags) |
aa1fa28f | 6196 | { |
6b754c8b | 6197 | struct io_async_msghdr iomsg, *kmsg; |
7ba89d2a | 6198 | struct io_sr_msg *sr = &req->sr_msg; |
03b1230c | 6199 | struct socket *sock; |
7a7cacba | 6200 | unsigned flags; |
d1fd1c20 | 6201 | int ret, min_ret = 0; |
45d189c6 | 6202 | bool force_nonblock = issue_flags & IO_URING_F_NONBLOCK; |
03b1230c | 6203 | |
dba4a925 | 6204 | sock = sock_from_file(req->file); |
7a7cacba | 6205 | if (unlikely(!sock)) |
dba4a925 | 6206 | return -ENOTSOCK; |
3529d8c2 | 6207 | |
d886e185 PB |
6208 | if (req_has_async_data(req)) { |
6209 | kmsg = req->async_data; | |
6210 | } else { | |
7a7cacba PB |
6211 | ret = io_recvmsg_copy_hdr(req, &iomsg); |
6212 | if (ret) | |
681fda8d | 6213 | return ret; |
7a7cacba PB |
6214 | kmsg = &iomsg; |
6215 | } | |
03b1230c | 6216 | |
0455d4cc JA |
6217 | if (!(req->flags & REQ_F_POLLED) && |
6218 | (sr->flags & IORING_RECVSEND_POLL_FIRST)) | |
6219 | return io_setup_async_msg(req, kmsg); | |
6220 | ||
b66e65f4 | 6221 | if (io_do_buffer_select(req)) { |
c54d52c2 JA |
6222 | void __user *buf; |
6223 | ||
4e906702 | 6224 | buf = io_buffer_select(req, &sr->len, issue_flags); |
c54d52c2 JA |
6225 | if (IS_ERR(buf)) |
6226 | return PTR_ERR(buf); | |
6227 | kmsg->fast_iov[0].iov_base = buf; | |
0a352aaa JA |
6228 | kmsg->fast_iov[0].iov_len = sr->len; |
6229 | iov_iter_init(&kmsg->msg.msg_iter, READ, kmsg->fast_iov, 1, | |
6230 | sr->len); | |
7a7cacba | 6231 | } |
52de1fe1 | 6232 | |
0a352aaa | 6233 | flags = sr->msg_flags; |
04411806 | 6234 | if (force_nonblock) |
7a7cacba | 6235 | flags |= MSG_DONTWAIT; |
0031275d SM |
6236 | if (flags & MSG_WAITALL) |
6237 | min_ret = iov_iter_count(&kmsg->msg.msg_iter); | |
6238 | ||
0a352aaa | 6239 | ret = __sys_recvmsg_sock(sock, &kmsg->msg, sr->umsg, kmsg->uaddr, flags); |
7297ce3d PB |
6240 | if (ret < min_ret) { |
6241 | if (ret == -EAGAIN && force_nonblock) | |
6242 | return io_setup_async_msg(req, kmsg); | |
6243 | if (ret == -ERESTARTSYS) | |
6244 | ret = -EINTR; | |
7ba89d2a JA |
6245 | if (ret > 0 && io_net_retry(sock, flags)) { |
6246 | sr->done_io += ret; | |
8a3e8ee5 | 6247 | req->flags |= REQ_F_PARTIAL_IO; |
7ba89d2a JA |
6248 | return io_setup_async_msg(req, kmsg); |
6249 | } | |
7297ce3d PB |
6250 | req_set_fail(req); |
6251 | } else if ((flags & MSG_WAITALL) && (kmsg->msg.msg_flags & (MSG_TRUNC | MSG_CTRUNC))) { | |
6252 | req_set_fail(req); | |
6253 | } | |
03b1230c | 6254 | |
257e84a5 PB |
6255 | /* fast path, check for non-NULL to avoid function call */ |
6256 | if (kmsg->free_iov) | |
6257 | kfree(kmsg->free_iov); | |
99bc4c38 | 6258 | req->flags &= ~REQ_F_NEED_CLEANUP; |
7ba89d2a JA |
6259 | if (ret >= 0) |
6260 | ret += sr->done_io; | |
6261 | else if (sr->done_io) | |
6262 | ret = sr->done_io; | |
cc3cec83 | 6263 | __io_req_complete(req, issue_flags, ret, io_put_kbuf(req, issue_flags)); |
03b1230c | 6264 | return 0; |
0fa03c62 | 6265 | } |
5d17b4a4 | 6266 | |
889fca73 | 6267 | static int io_recv(struct io_kiocb *req, unsigned int issue_flags) |
fddaface | 6268 | { |
7a7cacba PB |
6269 | struct io_sr_msg *sr = &req->sr_msg; |
6270 | struct msghdr msg; | |
fddaface | 6271 | struct socket *sock; |
7a7cacba PB |
6272 | struct iovec iov; |
6273 | unsigned flags; | |
d1fd1c20 | 6274 | int ret, min_ret = 0; |
45d189c6 | 6275 | bool force_nonblock = issue_flags & IO_URING_F_NONBLOCK; |
fddaface | 6276 | |
0455d4cc JA |
6277 | if (!(req->flags & REQ_F_POLLED) && |
6278 | (sr->flags & IORING_RECVSEND_POLL_FIRST)) | |
6279 | return -EAGAIN; | |
6280 | ||
dba4a925 | 6281 | sock = sock_from_file(req->file); |
7a7cacba | 6282 | if (unlikely(!sock)) |
dba4a925 | 6283 | return -ENOTSOCK; |
fddaface | 6284 | |
b66e65f4 | 6285 | if (io_do_buffer_select(req)) { |
c54d52c2 JA |
6286 | void __user *buf; |
6287 | ||
4e906702 | 6288 | buf = io_buffer_select(req, &sr->len, issue_flags); |
c54d52c2 JA |
6289 | if (IS_ERR(buf)) |
6290 | return PTR_ERR(buf); | |
6291 | sr->buf = buf; | |
bc02ef33 | 6292 | } |
bcda7baa | 6293 | |
c54d52c2 | 6294 | ret = import_single_range(READ, sr->buf, sr->len, &iov, &msg.msg_iter); |
14c32eee PB |
6295 | if (unlikely(ret)) |
6296 | goto out_free; | |
fddaface | 6297 | |
7a7cacba PB |
6298 | msg.msg_name = NULL; |
6299 | msg.msg_control = NULL; | |
6300 | msg.msg_controllen = 0; | |
6301 | msg.msg_namelen = 0; | |
6302 | msg.msg_iocb = NULL; | |
6303 | msg.msg_flags = 0; | |
fddaface | 6304 | |
0a352aaa | 6305 | flags = sr->msg_flags; |
04411806 | 6306 | if (force_nonblock) |
7a7cacba | 6307 | flags |= MSG_DONTWAIT; |
0031275d SM |
6308 | if (flags & MSG_WAITALL) |
6309 | min_ret = iov_iter_count(&msg.msg_iter); | |
6310 | ||
7a7cacba | 6311 | ret = sock_recvmsg(sock, &msg, flags); |
7297ce3d PB |
6312 | if (ret < min_ret) { |
6313 | if (ret == -EAGAIN && force_nonblock) | |
6314 | return -EAGAIN; | |
6315 | if (ret == -ERESTARTSYS) | |
6316 | ret = -EINTR; | |
7ba89d2a JA |
6317 | if (ret > 0 && io_net_retry(sock, flags)) { |
6318 | sr->len -= ret; | |
6319 | sr->buf += ret; | |
6320 | sr->done_io += ret; | |
8a3e8ee5 | 6321 | req->flags |= REQ_F_PARTIAL_IO; |
7ba89d2a JA |
6322 | return -EAGAIN; |
6323 | } | |
7297ce3d PB |
6324 | req_set_fail(req); |
6325 | } else if ((flags & MSG_WAITALL) && (msg.msg_flags & (MSG_TRUNC | MSG_CTRUNC))) { | |
0d7c1153 | 6326 | out_free: |
93d2bcd2 | 6327 | req_set_fail(req); |
7297ce3d | 6328 | } |
cc3cec83 | 6329 | |
7ba89d2a JA |
6330 | if (ret >= 0) |
6331 | ret += sr->done_io; | |
6332 | else if (sr->done_io) | |
6333 | ret = sr->done_io; | |
cc3cec83 | 6334 | __io_req_complete(req, issue_flags, ret, io_put_kbuf(req, issue_flags)); |
fddaface | 6335 | return 0; |
fddaface JA |
6336 | } |
6337 | ||
3529d8c2 | 6338 | static int io_accept_prep(struct io_kiocb *req, const struct io_uring_sqe *sqe) |
17f2fe35 | 6339 | { |
8ed8d3c3 JA |
6340 | struct io_accept *accept = &req->accept; |
6341 | ||
73911426 | 6342 | if (sqe->len || sqe->buf_index) |
17f2fe35 JA |
6343 | return -EINVAL; |
6344 | ||
d55e5f5b JA |
6345 | accept->addr = u64_to_user_ptr(READ_ONCE(sqe->addr)); |
6346 | accept->addr_len = u64_to_user_ptr(READ_ONCE(sqe->addr2)); | |
8ed8d3c3 | 6347 | accept->flags = READ_ONCE(sqe->accept_flags); |
09952e3e | 6348 | accept->nofile = rlimit(RLIMIT_NOFILE); |
a7083ad5 | 6349 | |
aaa4db12 | 6350 | accept->file_slot = READ_ONCE(sqe->file_index); |
adf3a9e9 | 6351 | if (accept->file_slot && (accept->flags & SOCK_CLOEXEC)) |
aaa4db12 | 6352 | return -EINVAL; |
a7083ad5 PB |
6353 | if (accept->flags & ~(SOCK_CLOEXEC | SOCK_NONBLOCK)) |
6354 | return -EINVAL; | |
6355 | if (SOCK_NONBLOCK != O_NONBLOCK && (accept->flags & SOCK_NONBLOCK)) | |
6356 | accept->flags = (accept->flags & ~SOCK_NONBLOCK) | O_NONBLOCK; | |
8ed8d3c3 | 6357 | return 0; |
8ed8d3c3 | 6358 | } |
17f2fe35 | 6359 | |
889fca73 | 6360 | static int io_accept(struct io_kiocb *req, unsigned int issue_flags) |
8ed8d3c3 JA |
6361 | { |
6362 | struct io_accept *accept = &req->accept; | |
45d189c6 | 6363 | bool force_nonblock = issue_flags & IO_URING_F_NONBLOCK; |
ac45abc0 | 6364 | unsigned int file_flags = force_nonblock ? O_NONBLOCK : 0; |
aaa4db12 | 6365 | bool fixed = !!accept->file_slot; |
a7083ad5 PB |
6366 | struct file *file; |
6367 | int ret, fd; | |
8ed8d3c3 | 6368 | |
aaa4db12 PB |
6369 | if (!fixed) { |
6370 | fd = __get_unused_fd_flags(accept->flags, accept->nofile); | |
6371 | if (unlikely(fd < 0)) | |
6372 | return fd; | |
6373 | } | |
a7083ad5 PB |
6374 | file = do_accept(req->file, file_flags, accept->addr, accept->addr_len, |
6375 | accept->flags); | |
6376 | if (IS_ERR(file)) { | |
aaa4db12 PB |
6377 | if (!fixed) |
6378 | put_unused_fd(fd); | |
a7083ad5 PB |
6379 | ret = PTR_ERR(file); |
6380 | if (ret == -EAGAIN && force_nonblock) | |
6381 | return -EAGAIN; | |
ac45abc0 PB |
6382 | if (ret == -ERESTARTSYS) |
6383 | ret = -EINTR; | |
93d2bcd2 | 6384 | req_set_fail(req); |
aaa4db12 | 6385 | } else if (!fixed) { |
a7083ad5 PB |
6386 | fd_install(fd, file); |
6387 | ret = fd; | |
aaa4db12 PB |
6388 | } else { |
6389 | ret = io_install_fixed_file(req, file, issue_flags, | |
6390 | accept->file_slot - 1); | |
ac45abc0 | 6391 | } |
889fca73 | 6392 | __io_req_complete(req, issue_flags, ret, 0); |
17f2fe35 | 6393 | return 0; |
8ed8d3c3 JA |
6394 | } |
6395 | ||
1374e08e JA |
6396 | static int io_socket_prep(struct io_kiocb *req, const struct io_uring_sqe *sqe) |
6397 | { | |
6398 | struct io_socket *sock = &req->sock; | |
6399 | ||
ee692a21 | 6400 | if (sqe->addr || sqe->rw_flags || sqe->buf_index) |
1374e08e JA |
6401 | return -EINVAL; |
6402 | ||
6403 | sock->domain = READ_ONCE(sqe->fd); | |
6404 | sock->type = READ_ONCE(sqe->off); | |
6405 | sock->protocol = READ_ONCE(sqe->len); | |
6406 | sock->file_slot = READ_ONCE(sqe->file_index); | |
6407 | sock->nofile = rlimit(RLIMIT_NOFILE); | |
6408 | ||
6409 | sock->flags = sock->type & ~SOCK_TYPE_MASK; | |
6410 | if (sock->file_slot && (sock->flags & SOCK_CLOEXEC)) | |
6411 | return -EINVAL; | |
6412 | if (sock->flags & ~(SOCK_CLOEXEC | SOCK_NONBLOCK)) | |
6413 | return -EINVAL; | |
6414 | return 0; | |
6415 | } | |
6416 | ||
6417 | static int io_socket(struct io_kiocb *req, unsigned int issue_flags) | |
6418 | { | |
6419 | struct io_socket *sock = &req->sock; | |
6420 | bool fixed = !!sock->file_slot; | |
6421 | struct file *file; | |
6422 | int ret, fd; | |
6423 | ||
6424 | if (!fixed) { | |
6425 | fd = __get_unused_fd_flags(sock->flags, sock->nofile); | |
6426 | if (unlikely(fd < 0)) | |
6427 | return fd; | |
6428 | } | |
6429 | file = __sys_socket_file(sock->domain, sock->type, sock->protocol); | |
6430 | if (IS_ERR(file)) { | |
6431 | if (!fixed) | |
6432 | put_unused_fd(fd); | |
6433 | ret = PTR_ERR(file); | |
6434 | if (ret == -EAGAIN && (issue_flags & IO_URING_F_NONBLOCK)) | |
6435 | return -EAGAIN; | |
6436 | if (ret == -ERESTARTSYS) | |
6437 | ret = -EINTR; | |
6438 | req_set_fail(req); | |
6439 | } else if (!fixed) { | |
6440 | fd_install(fd, file); | |
6441 | ret = fd; | |
6442 | } else { | |
6443 | ret = io_install_fixed_file(req, file, issue_flags, | |
6444 | sock->file_slot - 1); | |
6445 | } | |
6446 | __io_req_complete(req, issue_flags, ret, 0); | |
6447 | return 0; | |
6448 | } | |
6449 | ||
93642ef8 PB |
6450 | static int io_connect_prep_async(struct io_kiocb *req) |
6451 | { | |
6452 | struct io_async_connect *io = req->async_data; | |
6453 | struct io_connect *conn = &req->connect; | |
6454 | ||
6455 | return move_addr_to_kernel(conn->addr, conn->addr_len, &io->address); | |
6456 | } | |
6457 | ||
3529d8c2 | 6458 | static int io_connect_prep(struct io_kiocb *req, const struct io_uring_sqe *sqe) |
f499a021 | 6459 | { |
3529d8c2 | 6460 | struct io_connect *conn = &req->connect; |
f499a021 | 6461 | |
73911426 | 6462 | if (sqe->len || sqe->buf_index || sqe->rw_flags || sqe->splice_fd_in) |
3fbb51c1 JA |
6463 | return -EINVAL; |
6464 | ||
3529d8c2 JA |
6465 | conn->addr = u64_to_user_ptr(READ_ONCE(sqe->addr)); |
6466 | conn->addr_len = READ_ONCE(sqe->addr2); | |
93642ef8 | 6467 | return 0; |
f499a021 JA |
6468 | } |
6469 | ||
889fca73 | 6470 | static int io_connect(struct io_kiocb *req, unsigned int issue_flags) |
f8e85cf2 | 6471 | { |
e8c2bc1f | 6472 | struct io_async_connect __io, *io; |
f8e85cf2 | 6473 | unsigned file_flags; |
3fbb51c1 | 6474 | int ret; |
45d189c6 | 6475 | bool force_nonblock = issue_flags & IO_URING_F_NONBLOCK; |
f8e85cf2 | 6476 | |
d886e185 | 6477 | if (req_has_async_data(req)) { |
e8c2bc1f | 6478 | io = req->async_data; |
f499a021 | 6479 | } else { |
3529d8c2 JA |
6480 | ret = move_addr_to_kernel(req->connect.addr, |
6481 | req->connect.addr_len, | |
e8c2bc1f | 6482 | &__io.address); |
f499a021 JA |
6483 | if (ret) |
6484 | goto out; | |
6485 | io = &__io; | |
6486 | } | |
6487 | ||
3fbb51c1 JA |
6488 | file_flags = force_nonblock ? O_NONBLOCK : 0; |
6489 | ||
e8c2bc1f | 6490 | ret = __sys_connect_file(req->file, &io->address, |
3fbb51c1 | 6491 | req->connect.addr_len, file_flags); |
87f80d62 | 6492 | if ((ret == -EAGAIN || ret == -EINPROGRESS) && force_nonblock) { |
d886e185 | 6493 | if (req_has_async_data(req)) |
b7bb4f7d | 6494 | return -EAGAIN; |
e8c2bc1f | 6495 | if (io_alloc_async_data(req)) { |
f499a021 JA |
6496 | ret = -ENOMEM; |
6497 | goto out; | |
6498 | } | |
e8c2bc1f | 6499 | memcpy(req->async_data, &__io, sizeof(__io)); |
f8e85cf2 | 6500 | return -EAGAIN; |
f499a021 | 6501 | } |
f8e85cf2 JA |
6502 | if (ret == -ERESTARTSYS) |
6503 | ret = -EINTR; | |
f499a021 | 6504 | out: |
4e88d6e7 | 6505 | if (ret < 0) |
93d2bcd2 | 6506 | req_set_fail(req); |
889fca73 | 6507 | __io_req_complete(req, issue_flags, ret, 0); |
f8e85cf2 | 6508 | return 0; |
469956e8 Y |
6509 | } |
6510 | #else /* !CONFIG_NET */ | |
99a10081 JA |
6511 | #define IO_NETOP_FN(op) \ |
6512 | static int io_##op(struct io_kiocb *req, unsigned int issue_flags) \ | |
6513 | { \ | |
6514 | return -EOPNOTSUPP; \ | |
6515 | } | |
6516 | ||
6517 | #define IO_NETOP_PREP(op) \ | |
6518 | IO_NETOP_FN(op) \ | |
6519 | static int io_##op##_prep(struct io_kiocb *req, const struct io_uring_sqe *sqe) \ | |
6520 | { \ | |
6521 | return -EOPNOTSUPP; \ | |
6522 | } \ | |
6523 | ||
6524 | #define IO_NETOP_PREP_ASYNC(op) \ | |
6525 | IO_NETOP_PREP(op) \ | |
6526 | static int io_##op##_prep_async(struct io_kiocb *req) \ | |
6527 | { \ | |
6528 | return -EOPNOTSUPP; \ | |
6529 | } | |
6530 | ||
6531 | IO_NETOP_PREP_ASYNC(sendmsg); | |
6532 | IO_NETOP_PREP_ASYNC(recvmsg); | |
6533 | IO_NETOP_PREP_ASYNC(connect); | |
6534 | IO_NETOP_PREP(accept); | |
1374e08e | 6535 | IO_NETOP_PREP(socket); |
99a10081 JA |
6536 | IO_NETOP_FN(send); |
6537 | IO_NETOP_FN(recv); | |
469956e8 | 6538 | #endif /* CONFIG_NET */ |
f8e85cf2 | 6539 | |
d7718a9d JA |
6540 | struct io_poll_table { |
6541 | struct poll_table_struct pt; | |
6542 | struct io_kiocb *req; | |
68b11e8b | 6543 | int nr_entries; |
d7718a9d JA |
6544 | int error; |
6545 | }; | |
ce593a6c | 6546 | |
aa43477b | 6547 | #define IO_POLL_CANCEL_FLAG BIT(31) |
e2c0cb7c | 6548 | #define IO_POLL_REF_MASK GENMASK(30, 0) |
6d816e08 | 6549 | |
aa43477b PB |
6550 | /* |
6551 | * If refs part of ->poll_refs (see IO_POLL_REF_MASK) is 0, it's free. We can | |
6552 | * bump it and acquire ownership. It's disallowed to modify requests while not | |
6553 | * owning it, that prevents from races for enqueueing task_work's and b/w | |
6554 | * arming poll and wakeups. | |
6555 | */ | |
6556 | static inline bool io_poll_get_ownership(struct io_kiocb *req) | |
6557 | { | |
6558 | return !(atomic_fetch_inc(&req->poll_refs) & IO_POLL_REF_MASK); | |
d7718a9d JA |
6559 | } |
6560 | ||
aa43477b | 6561 | static void io_poll_mark_cancelled(struct io_kiocb *req) |
74ce6ce4 | 6562 | { |
aa43477b | 6563 | atomic_or(IO_POLL_CANCEL_FLAG, &req->poll_refs); |
74ce6ce4 JA |
6564 | } |
6565 | ||
d4e7cd36 | 6566 | static struct io_poll_iocb *io_poll_get_double(struct io_kiocb *req) |
18bceab1 | 6567 | { |
e8c2bc1f | 6568 | /* pure poll stashes this in ->async_data, poll driven retry elsewhere */ |
d4e7cd36 | 6569 | if (req->opcode == IORING_OP_POLL_ADD) |
e8c2bc1f | 6570 | return req->async_data; |
d4e7cd36 JA |
6571 | return req->apoll->double_poll; |
6572 | } | |
6573 | ||
6574 | static struct io_poll_iocb *io_poll_get_single(struct io_kiocb *req) | |
6575 | { | |
6576 | if (req->opcode == IORING_OP_POLL_ADD) | |
6577 | return &req->poll; | |
6578 | return &req->apoll->poll; | |
6579 | } | |
6580 | ||
5641897a | 6581 | static void io_poll_req_insert(struct io_kiocb *req) |
d4e7cd36 | 6582 | { |
5641897a PB |
6583 | struct io_ring_ctx *ctx = req->ctx; |
6584 | struct hlist_head *list; | |
18bceab1 | 6585 | |
cef216fc | 6586 | list = &ctx->cancel_hash[hash_long(req->cqe.user_data, ctx->cancel_hash_bits)]; |
5641897a | 6587 | hlist_add_head(&req->hash_node, list); |
18bceab1 JA |
6588 | } |
6589 | ||
5641897a PB |
6590 | static void io_init_poll_iocb(struct io_poll_iocb *poll, __poll_t events, |
6591 | wait_queue_func_t wake_func) | |
18bceab1 | 6592 | { |
5641897a | 6593 | poll->head = NULL; |
5641897a PB |
6594 | #define IO_POLL_UNMASK (EPOLLERR|EPOLLHUP|EPOLLNVAL|EPOLLRDHUP) |
6595 | /* mask in events that we always want/need */ | |
6596 | poll->events = events | IO_POLL_UNMASK; | |
6597 | INIT_LIST_HEAD(&poll->wait.entry); | |
6598 | init_waitqueue_func_entry(&poll->wait, wake_func); | |
18bceab1 JA |
6599 | } |
6600 | ||
aa43477b | 6601 | static inline void io_poll_remove_entry(struct io_poll_iocb *poll) |
18bceab1 | 6602 | { |
791f3465 | 6603 | struct wait_queue_head *head = smp_load_acquire(&poll->head); |
18bceab1 | 6604 | |
791f3465 PB |
6605 | if (head) { |
6606 | spin_lock_irq(&head->lock); | |
6607 | list_del_init(&poll->wait.entry); | |
6608 | poll->head = NULL; | |
6609 | spin_unlock_irq(&head->lock); | |
6610 | } | |
aa43477b | 6611 | } |
18bceab1 | 6612 | |
aa43477b PB |
6613 | static void io_poll_remove_entries(struct io_kiocb *req) |
6614 | { | |
91eac1c6 JA |
6615 | /* |
6616 | * Nothing to do if neither of those flags are set. Avoid dipping | |
6617 | * into the poll/apoll/double cachelines if we can. | |
6618 | */ | |
6619 | if (!(req->flags & (REQ_F_SINGLE_POLL | REQ_F_DOUBLE_POLL))) | |
6620 | return; | |
18bceab1 | 6621 | |
791f3465 PB |
6622 | /* |
6623 | * While we hold the waitqueue lock and the waitqueue is nonempty, | |
6624 | * wake_up_pollfree() will wait for us. However, taking the waitqueue | |
6625 | * lock in the first place can race with the waitqueue being freed. | |
6626 | * | |
6627 | * We solve this as eventpoll does: by taking advantage of the fact that | |
6628 | * all users of wake_up_pollfree() will RCU-delay the actual free. If | |
6629 | * we enter rcu_read_lock() and see that the pointer to the queue is | |
6630 | * non-NULL, we can then lock it without the memory being freed out from | |
6631 | * under us. | |
6632 | * | |
6633 | * Keep holding rcu_read_lock() as long as we hold the queue lock, in | |
6634 | * case the caller deletes the entry from the queue, leaving it empty. | |
6635 | * In that case, only RCU prevents the queue memory from being freed. | |
6636 | */ | |
6637 | rcu_read_lock(); | |
91eac1c6 JA |
6638 | if (req->flags & REQ_F_SINGLE_POLL) |
6639 | io_poll_remove_entry(io_poll_get_single(req)); | |
6640 | if (req->flags & REQ_F_DOUBLE_POLL) | |
6641 | io_poll_remove_entry(io_poll_get_double(req)); | |
791f3465 | 6642 | rcu_read_unlock(); |
18bceab1 JA |
6643 | } |
6644 | ||
aa43477b PB |
6645 | /* |
6646 | * All poll tw should go through this. Checks for poll events, manages | |
6647 | * references, does rewait, etc. | |
6648 | * | |
6649 | * Returns a negative error on failure. >0 when no action require, which is | |
6650 | * either spurious wakeup or multishot CQE is served. 0 when it's done with | |
cef216fc | 6651 | * the request, then the mask is stored in req->cqe.res. |
aa43477b | 6652 | */ |
5106dd6e | 6653 | static int io_poll_check_events(struct io_kiocb *req, bool locked) |
18bceab1 | 6654 | { |
74ce6ce4 | 6655 | struct io_ring_ctx *ctx = req->ctx; |
aa43477b | 6656 | int v; |
18bceab1 | 6657 | |
316319e8 | 6658 | /* req->task == current here, checking PF_EXITING is safe */ |
e09ee510 | 6659 | if (unlikely(req->task->flags & PF_EXITING)) |
f2219057 | 6660 | return -ECANCELED; |
18bceab1 | 6661 | |
aa43477b PB |
6662 | do { |
6663 | v = atomic_read(&req->poll_refs); | |
74ce6ce4 | 6664 | |
aa43477b PB |
6665 | /* tw handler should be the owner, and so have some references */ |
6666 | if (WARN_ON_ONCE(!(v & IO_POLL_REF_MASK))) | |
6667 | return 0; | |
6668 | if (v & IO_POLL_CANCEL_FLAG) | |
6669 | return -ECANCELED; | |
8706e04e | 6670 | |
cef216fc | 6671 | if (!req->cqe.res) { |
2804ecd8 | 6672 | struct poll_table_struct pt = { ._key = req->apoll_events }; |
cce64ef0 | 6673 | unsigned flags = locked ? 0 : IO_URING_F_UNLOCKED; |
18bceab1 | 6674 | |
cce64ef0 | 6675 | if (unlikely(!io_assign_file(req, flags))) |
7179c3ce | 6676 | return -EBADF; |
cef216fc | 6677 | req->cqe.res = vfs_poll(req->file, &pt) & req->apoll_events; |
c8b5e260 | 6678 | } |
74ce6ce4 | 6679 | |
aa43477b | 6680 | /* multishot, just fill an CQE and proceed */ |
cef216fc PB |
6681 | if (req->cqe.res && !(req->apoll_events & EPOLLONESHOT)) { |
6682 | __poll_t mask = mangle_poll(req->cqe.res & req->apoll_events); | |
aa43477b | 6683 | bool filled; |
18bceab1 | 6684 | |
aa43477b | 6685 | spin_lock(&ctx->completion_lock); |
cef216fc | 6686 | filled = io_fill_cqe_aux(ctx, req->cqe.user_data, mask, |
aa43477b PB |
6687 | IORING_CQE_F_MORE); |
6688 | io_commit_cqring(ctx); | |
6689 | spin_unlock(&ctx->completion_lock); | |
6690 | if (unlikely(!filled)) | |
6691 | return -ECANCELED; | |
6692 | io_cqring_ev_posted(ctx); | |
cef216fc | 6693 | } else if (req->cqe.res) { |
aa43477b PB |
6694 | return 0; |
6695 | } | |
18bceab1 | 6696 | |
aa43477b PB |
6697 | /* |
6698 | * Release all references, retry if someone tried to restart | |
6699 | * task_work while we were executing it. | |
6700 | */ | |
6701 | } while (atomic_sub_return(v & IO_POLL_REF_MASK, &req->poll_refs)); | |
18bceab1 | 6702 | |
18bceab1 JA |
6703 | return 1; |
6704 | } | |
6705 | ||
aa43477b | 6706 | static void io_poll_task_func(struct io_kiocb *req, bool *locked) |
18bceab1 | 6707 | { |
18bceab1 | 6708 | struct io_ring_ctx *ctx = req->ctx; |
aa43477b | 6709 | int ret; |
18bceab1 | 6710 | |
5106dd6e | 6711 | ret = io_poll_check_events(req, *locked); |
aa43477b PB |
6712 | if (ret > 0) |
6713 | return; | |
6714 | ||
6715 | if (!ret) { | |
cef216fc | 6716 | req->cqe.res = mangle_poll(req->cqe.res & req->poll.events); |
e27414be | 6717 | } else { |
cef216fc | 6718 | req->cqe.res = ret; |
aa43477b | 6719 | req_set_fail(req); |
a62682f9 | 6720 | } |
aa43477b PB |
6721 | |
6722 | io_poll_remove_entries(req); | |
6723 | spin_lock(&ctx->completion_lock); | |
6724 | hash_del(&req->hash_node); | |
cef216fc | 6725 | __io_req_complete_post(req, req->cqe.res, 0); |
aa43477b PB |
6726 | io_commit_cqring(ctx); |
6727 | spin_unlock(&ctx->completion_lock); | |
6728 | io_cqring_ev_posted(ctx); | |
18bceab1 JA |
6729 | } |
6730 | ||
aa43477b | 6731 | static void io_apoll_task_func(struct io_kiocb *req, bool *locked) |
18bceab1 JA |
6732 | { |
6733 | struct io_ring_ctx *ctx = req->ctx; | |
aa43477b | 6734 | int ret; |
18bceab1 | 6735 | |
5106dd6e | 6736 | ret = io_poll_check_events(req, *locked); |
aa43477b PB |
6737 | if (ret > 0) |
6738 | return; | |
18bceab1 | 6739 | |
aa43477b PB |
6740 | io_poll_remove_entries(req); |
6741 | spin_lock(&ctx->completion_lock); | |
6742 | hash_del(&req->hash_node); | |
6743 | spin_unlock(&ctx->completion_lock); | |
18bceab1 | 6744 | |
aa43477b PB |
6745 | if (!ret) |
6746 | io_req_task_submit(req, locked); | |
6747 | else | |
6748 | io_req_complete_failed(req, ret); | |
18bceab1 JA |
6749 | } |
6750 | ||
81459350 | 6751 | static void __io_poll_execute(struct io_kiocb *req, int mask, int events) |
aa43477b | 6752 | { |
cef216fc | 6753 | req->cqe.res = mask; |
81459350 JA |
6754 | /* |
6755 | * This is useful for poll that is armed on behalf of another | |
6756 | * request, and where the wakeup path could be on a different | |
6757 | * CPU. We want to avoid pulling in req->apoll->events for that | |
6758 | * case. | |
6759 | */ | |
2804ecd8 | 6760 | req->apoll_events = events; |
aa43477b PB |
6761 | if (req->opcode == IORING_OP_POLL_ADD) |
6762 | req->io_task_work.func = io_poll_task_func; | |
6763 | else | |
6764 | req->io_task_work.func = io_apoll_task_func; | |
6765 | ||
cef216fc | 6766 | trace_io_uring_task_add(req->ctx, req, req->cqe.user_data, req->opcode, mask); |
aa43477b PB |
6767 | io_req_task_work_add(req, false); |
6768 | } | |
6769 | ||
81459350 | 6770 | static inline void io_poll_execute(struct io_kiocb *req, int res, int events) |
aa43477b PB |
6771 | { |
6772 | if (io_poll_get_ownership(req)) | |
81459350 | 6773 | __io_poll_execute(req, res, events); |
aa43477b PB |
6774 | } |
6775 | ||
6776 | static void io_poll_cancel_req(struct io_kiocb *req) | |
6777 | { | |
6778 | io_poll_mark_cancelled(req); | |
6779 | /* kick tw, which should complete the request */ | |
81459350 | 6780 | io_poll_execute(req, 0, 0); |
aa43477b PB |
6781 | } |
6782 | ||
d89a4fac JA |
6783 | #define wqe_to_req(wait) ((void *)((unsigned long) (wait)->private & ~1)) |
6784 | #define wqe_is_double(wait) ((unsigned long) (wait)->private & 1) | |
6785 | ||
aa43477b PB |
6786 | static int io_poll_wake(struct wait_queue_entry *wait, unsigned mode, int sync, |
6787 | void *key) | |
18bceab1 | 6788 | { |
d89a4fac | 6789 | struct io_kiocb *req = wqe_to_req(wait); |
aa43477b PB |
6790 | struct io_poll_iocb *poll = container_of(wait, struct io_poll_iocb, |
6791 | wait); | |
18bceab1 JA |
6792 | __poll_t mask = key_to_poll(key); |
6793 | ||
791f3465 PB |
6794 | if (unlikely(mask & POLLFREE)) { |
6795 | io_poll_mark_cancelled(req); | |
6796 | /* we have to kick tw in case it's not already */ | |
81459350 | 6797 | io_poll_execute(req, 0, poll->events); |
791f3465 PB |
6798 | |
6799 | /* | |
6800 | * If the waitqueue is being freed early but someone is already | |
6801 | * holds ownership over it, we have to tear down the request as | |
6802 | * best we can. That means immediately removing the request from | |
6803 | * its waitqueue and preventing all further accesses to the | |
6804 | * waitqueue via the request. | |
6805 | */ | |
6806 | list_del_init(&poll->wait.entry); | |
6807 | ||
6808 | /* | |
6809 | * Careful: this *must* be the last step, since as soon | |
6810 | * as req->head is NULL'ed out, the request can be | |
6811 | * completed and freed, since aio_poll_complete_work() | |
6812 | * will no longer need to take the waitqueue lock. | |
6813 | */ | |
6814 | smp_store_release(&poll->head, NULL); | |
6815 | return 1; | |
6816 | } | |
6817 | ||
aa43477b | 6818 | /* for instances that support it check for an event match first */ |
18bceab1 JA |
6819 | if (mask && !(mask & poll->events)) |
6820 | return 0; | |
6821 | ||
eb0089d6 PB |
6822 | if (io_poll_get_ownership(req)) { |
6823 | /* optional, saves extra locking for removal in tw handler */ | |
6824 | if (mask && poll->events & EPOLLONESHOT) { | |
6825 | list_del_init(&poll->wait.entry); | |
6826 | poll->head = NULL; | |
d89a4fac JA |
6827 | if (wqe_is_double(wait)) |
6828 | req->flags &= ~REQ_F_DOUBLE_POLL; | |
6829 | else | |
6830 | req->flags &= ~REQ_F_SINGLE_POLL; | |
eb0089d6 | 6831 | } |
81459350 | 6832 | __io_poll_execute(req, mask, poll->events); |
eb0089d6 | 6833 | } |
18bceab1 | 6834 | return 1; |
18bceab1 JA |
6835 | } |
6836 | ||
6837 | static void __io_queue_proc(struct io_poll_iocb *poll, struct io_poll_table *pt, | |
807abcb0 JA |
6838 | struct wait_queue_head *head, |
6839 | struct io_poll_iocb **poll_ptr) | |
18bceab1 JA |
6840 | { |
6841 | struct io_kiocb *req = pt->req; | |
d89a4fac | 6842 | unsigned long wqe_private = (unsigned long) req; |
18bceab1 JA |
6843 | |
6844 | /* | |
68b11e8b PB |
6845 | * The file being polled uses multiple waitqueues for poll handling |
6846 | * (e.g. one for read, one for write). Setup a separate io_poll_iocb | |
6847 | * if this happens. | |
18bceab1 | 6848 | */ |
68b11e8b | 6849 | if (unlikely(pt->nr_entries)) { |
aa43477b | 6850 | struct io_poll_iocb *first = poll; |
58852d4d | 6851 | |
23a65db8 | 6852 | /* double add on the same waitqueue head, ignore */ |
aa43477b | 6853 | if (first->head == head) |
23a65db8 | 6854 | return; |
18bceab1 | 6855 | /* already have a 2nd entry, fail a third attempt */ |
807abcb0 | 6856 | if (*poll_ptr) { |
23a65db8 PB |
6857 | if ((*poll_ptr)->head == head) |
6858 | return; | |
18bceab1 JA |
6859 | pt->error = -EINVAL; |
6860 | return; | |
6861 | } | |
aa43477b | 6862 | |
18bceab1 JA |
6863 | poll = kmalloc(sizeof(*poll), GFP_ATOMIC); |
6864 | if (!poll) { | |
6865 | pt->error = -ENOMEM; | |
6866 | return; | |
6867 | } | |
d89a4fac JA |
6868 | /* mark as double wq entry */ |
6869 | wqe_private |= 1; | |
91eac1c6 | 6870 | req->flags |= REQ_F_DOUBLE_POLL; |
aa43477b | 6871 | io_init_poll_iocb(poll, first->events, first->wait.func); |
807abcb0 | 6872 | *poll_ptr = poll; |
d886e185 PB |
6873 | if (req->opcode == IORING_OP_POLL_ADD) |
6874 | req->flags |= REQ_F_ASYNC_DATA; | |
18bceab1 JA |
6875 | } |
6876 | ||
91eac1c6 | 6877 | req->flags |= REQ_F_SINGLE_POLL; |
68b11e8b | 6878 | pt->nr_entries++; |
18bceab1 | 6879 | poll->head = head; |
d89a4fac | 6880 | poll->wait.private = (void *) wqe_private; |
a31eb4a2 JX |
6881 | |
6882 | if (poll->events & EPOLLEXCLUSIVE) | |
6883 | add_wait_queue_exclusive(head, &poll->wait); | |
6884 | else | |
6885 | add_wait_queue(head, &poll->wait); | |
18bceab1 JA |
6886 | } |
6887 | ||
aa43477b | 6888 | static void io_poll_queue_proc(struct file *file, struct wait_queue_head *head, |
18bceab1 JA |
6889 | struct poll_table_struct *p) |
6890 | { | |
6891 | struct io_poll_table *pt = container_of(p, struct io_poll_table, pt); | |
d7718a9d | 6892 | |
aa43477b PB |
6893 | __io_queue_proc(&pt->req->poll, pt, head, |
6894 | (struct io_poll_iocb **) &pt->req->async_data); | |
d7718a9d JA |
6895 | } |
6896 | ||
aa43477b PB |
6897 | static int __io_arm_poll_handler(struct io_kiocb *req, |
6898 | struct io_poll_iocb *poll, | |
6899 | struct io_poll_table *ipt, __poll_t mask) | |
d7718a9d JA |
6900 | { |
6901 | struct io_ring_ctx *ctx = req->ctx; | |
aa43477b | 6902 | int v; |
d7718a9d | 6903 | |
4d52f338 | 6904 | INIT_HLIST_NODE(&req->hash_node); |
8e29da69 | 6905 | req->work.cancel_seq = atomic_read(&ctx->cancel_seq); |
aa43477b | 6906 | io_init_poll_iocb(poll, mask, io_poll_wake); |
b90cd197 | 6907 | poll->file = req->file; |
d7718a9d JA |
6908 | |
6909 | ipt->pt._key = mask; | |
6910 | ipt->req = req; | |
68b11e8b PB |
6911 | ipt->error = 0; |
6912 | ipt->nr_entries = 0; | |
d7718a9d | 6913 | |
aa43477b PB |
6914 | /* |
6915 | * Take the ownership to delay any tw execution up until we're done | |
6916 | * with poll arming. see io_poll_get_ownership(). | |
6917 | */ | |
6918 | atomic_set(&req->poll_refs, 1); | |
d7718a9d | 6919 | mask = vfs_poll(req->file, &ipt->pt) & poll->events; |
aa43477b PB |
6920 | |
6921 | if (mask && (poll->events & EPOLLONESHOT)) { | |
6922 | io_poll_remove_entries(req); | |
6923 | /* no one else has access to the req, forget about the ref */ | |
6924 | return mask; | |
6925 | } | |
6926 | if (!mask && unlikely(ipt->error || !ipt->nr_entries)) { | |
6927 | io_poll_remove_entries(req); | |
6928 | if (!ipt->error) | |
6929 | ipt->error = -EINVAL; | |
6930 | return 0; | |
6931 | } | |
d7718a9d | 6932 | |
79ebeaee | 6933 | spin_lock(&ctx->completion_lock); |
aa43477b PB |
6934 | io_poll_req_insert(req); |
6935 | spin_unlock(&ctx->completion_lock); | |
6936 | ||
6937 | if (mask) { | |
6938 | /* can't multishot if failed, just queue the event we've got */ | |
6939 | if (unlikely(ipt->error || !ipt->nr_entries)) | |
6940 | poll->events |= EPOLLONESHOT; | |
81459350 | 6941 | __io_poll_execute(req, mask, poll->events); |
aa43477b | 6942 | return 0; |
d7718a9d JA |
6943 | } |
6944 | ||
aa43477b PB |
6945 | /* |
6946 | * Release ownership. If someone tried to queue a tw while it was | |
6947 | * locked, kick it off for them. | |
6948 | */ | |
6949 | v = atomic_dec_return(&req->poll_refs); | |
6950 | if (unlikely(v & IO_POLL_REF_MASK)) | |
81459350 | 6951 | __io_poll_execute(req, 0, poll->events); |
aa43477b PB |
6952 | return 0; |
6953 | } | |
6954 | ||
6955 | static void io_async_queue_proc(struct file *file, struct wait_queue_head *head, | |
6956 | struct poll_table_struct *p) | |
6957 | { | |
6958 | struct io_poll_table *pt = container_of(p, struct io_poll_table, pt); | |
6959 | struct async_poll *apoll = pt->req->apoll; | |
6960 | ||
6961 | __io_queue_proc(&apoll->poll, pt, head, &apoll->double_poll); | |
d7718a9d JA |
6962 | } |
6963 | ||
59b735ae OL |
6964 | enum { |
6965 | IO_APOLL_OK, | |
6966 | IO_APOLL_ABORTED, | |
6967 | IO_APOLL_READY | |
6968 | }; | |
6969 | ||
4d9237e3 | 6970 | static int io_arm_poll_handler(struct io_kiocb *req, unsigned issue_flags) |
d7718a9d JA |
6971 | { |
6972 | const struct io_op_def *def = &io_op_defs[req->opcode]; | |
6973 | struct io_ring_ctx *ctx = req->ctx; | |
6974 | struct async_poll *apoll; | |
6975 | struct io_poll_table ipt; | |
aa43477b PB |
6976 | __poll_t mask = EPOLLONESHOT | POLLERR | POLLPRI; |
6977 | int ret; | |
d7718a9d | 6978 | |
b2d9c3da PB |
6979 | if (!def->pollin && !def->pollout) |
6980 | return IO_APOLL_ABORTED; | |
10c87333 JA |
6981 | if (!file_can_poll(req->file)) |
6982 | return IO_APOLL_ABORTED; | |
6983 | if ((req->flags & (REQ_F_POLLED|REQ_F_PARTIAL_IO)) == REQ_F_POLLED) | |
658d0a40 | 6984 | return IO_APOLL_ABORTED; |
b2d9c3da PB |
6985 | |
6986 | if (def->pollin) { | |
b2d9c3da PB |
6987 | mask |= POLLIN | POLLRDNORM; |
6988 | ||
6989 | /* If reading from MSG_ERRQUEUE using recvmsg, ignore POLLIN */ | |
6990 | if ((req->opcode == IORING_OP_RECVMSG) && | |
6991 | (req->sr_msg.msg_flags & MSG_ERRQUEUE)) | |
6992 | mask &= ~POLLIN; | |
6993 | } else { | |
b2d9c3da PB |
6994 | mask |= POLLOUT | POLLWRNORM; |
6995 | } | |
52dd8640 DY |
6996 | if (def->poll_exclusive) |
6997 | mask |= EPOLLEXCLUSIVE; | |
10c87333 JA |
6998 | if (req->flags & REQ_F_POLLED) { |
6999 | apoll = req->apoll; | |
7000 | } else if (!(issue_flags & IO_URING_F_UNLOCKED) && | |
7001 | !list_empty(&ctx->apoll_cache)) { | |
4d9237e3 JA |
7002 | apoll = list_first_entry(&ctx->apoll_cache, struct async_poll, |
7003 | poll.wait.entry); | |
7004 | list_del_init(&apoll->poll.wait.entry); | |
7005 | } else { | |
7006 | apoll = kmalloc(sizeof(*apoll), GFP_ATOMIC); | |
7007 | if (unlikely(!apoll)) | |
7008 | return IO_APOLL_ABORTED; | |
7009 | } | |
807abcb0 | 7010 | apoll->double_poll = NULL; |
d7718a9d | 7011 | req->apoll = apoll; |
b2d9c3da | 7012 | req->flags |= REQ_F_POLLED; |
d7718a9d JA |
7013 | ipt.pt._qproc = io_async_queue_proc; |
7014 | ||
4d55f238 | 7015 | io_kbuf_recycle(req, issue_flags); |
abdad709 | 7016 | |
aa43477b | 7017 | ret = __io_arm_poll_handler(req, &apoll->poll, &ipt, mask); |
41a5169c HX |
7018 | if (ret || ipt.error) |
7019 | return ret ? IO_APOLL_READY : IO_APOLL_ABORTED; | |
7020 | ||
cef216fc | 7021 | trace_io_uring_poll_arm(ctx, req, req->cqe.user_data, req->opcode, |
236daeae | 7022 | mask, apoll->poll.events); |
59b735ae | 7023 | return IO_APOLL_OK; |
d7718a9d JA |
7024 | } |
7025 | ||
76e1b642 JA |
7026 | /* |
7027 | * Returns true if we found and killed one or more poll requests | |
7028 | */ | |
c072481d PB |
7029 | static __cold bool io_poll_remove_all(struct io_ring_ctx *ctx, |
7030 | struct task_struct *tsk, bool cancel_all) | |
221c5eb2 | 7031 | { |
78076bb6 | 7032 | struct hlist_node *tmp; |
221c5eb2 | 7033 | struct io_kiocb *req; |
aa43477b PB |
7034 | bool found = false; |
7035 | int i; | |
221c5eb2 | 7036 | |
79ebeaee | 7037 | spin_lock(&ctx->completion_lock); |
78076bb6 JA |
7038 | for (i = 0; i < (1U << ctx->cancel_hash_bits); i++) { |
7039 | struct hlist_head *list; | |
7040 | ||
7041 | list = &ctx->cancel_hash[i]; | |
f3606e3a | 7042 | hlist_for_each_entry_safe(req, tmp, list, hash_node) { |
42a7b4ed | 7043 | if (io_match_task_safe(req, tsk, cancel_all)) { |
61bc84c4 | 7044 | hlist_del_init(&req->hash_node); |
aa43477b PB |
7045 | io_poll_cancel_req(req); |
7046 | found = true; | |
7047 | } | |
f3606e3a | 7048 | } |
221c5eb2 | 7049 | } |
79ebeaee | 7050 | spin_unlock(&ctx->completion_lock); |
aa43477b | 7051 | return found; |
221c5eb2 JA |
7052 | } |
7053 | ||
b21432b4 JA |
7054 | static struct io_kiocb *io_poll_find(struct io_ring_ctx *ctx, bool poll_only, |
7055 | struct io_cancel_data *cd) | |
e07785b0 | 7056 | __must_hold(&ctx->completion_lock) |
47f46768 | 7057 | { |
78076bb6 | 7058 | struct hlist_head *list; |
47f46768 JA |
7059 | struct io_kiocb *req; |
7060 | ||
b21432b4 | 7061 | list = &ctx->cancel_hash[hash_long(cd->data, ctx->cancel_hash_bits)]; |
78076bb6 | 7062 | hlist_for_each_entry(req, list, hash_node) { |
b21432b4 | 7063 | if (cd->data != req->cqe.user_data) |
b41e9852 | 7064 | continue; |
9ba5fac8 PB |
7065 | if (poll_only && req->opcode != IORING_OP_POLL_ADD) |
7066 | continue; | |
8e29da69 JA |
7067 | if (cd->flags & IORING_ASYNC_CANCEL_ALL) { |
7068 | if (cd->seq == req->work.cancel_seq) | |
7069 | continue; | |
7070 | req->work.cancel_seq = cd->seq; | |
7071 | } | |
b2cb805f | 7072 | return req; |
47f46768 | 7073 | } |
b2cb805f JA |
7074 | return NULL; |
7075 | } | |
7076 | ||
4bf94615 JA |
7077 | static struct io_kiocb *io_poll_file_find(struct io_ring_ctx *ctx, |
7078 | struct io_cancel_data *cd) | |
7079 | __must_hold(&ctx->completion_lock) | |
7080 | { | |
7081 | struct io_kiocb *req; | |
7082 | int i; | |
7083 | ||
7084 | for (i = 0; i < (1U << ctx->cancel_hash_bits); i++) { | |
7085 | struct hlist_head *list; | |
7086 | ||
7087 | list = &ctx->cancel_hash[i]; | |
7088 | hlist_for_each_entry(req, list, hash_node) { | |
970f256e JA |
7089 | if (!(cd->flags & IORING_ASYNC_CANCEL_ANY) && |
7090 | req->file != cd->file) | |
4bf94615 JA |
7091 | continue; |
7092 | if (cd->seq == req->work.cancel_seq) | |
7093 | continue; | |
7094 | req->work.cancel_seq = cd->seq; | |
7095 | return req; | |
7096 | } | |
7097 | } | |
7098 | return NULL; | |
7099 | } | |
7100 | ||
aa43477b PB |
7101 | static bool io_poll_disarm(struct io_kiocb *req) |
7102 | __must_hold(&ctx->completion_lock) | |
7103 | { | |
7104 | if (!io_poll_get_ownership(req)) | |
7105 | return false; | |
7106 | io_poll_remove_entries(req); | |
7107 | hash_del(&req->hash_node); | |
7108 | return true; | |
7109 | } | |
7110 | ||
b21432b4 | 7111 | static int io_poll_cancel(struct io_ring_ctx *ctx, struct io_cancel_data *cd) |
e07785b0 | 7112 | __must_hold(&ctx->completion_lock) |
b2cb805f | 7113 | { |
4bf94615 | 7114 | struct io_kiocb *req; |
b2cb805f | 7115 | |
970f256e | 7116 | if (cd->flags & (IORING_ASYNC_CANCEL_FD|IORING_ASYNC_CANCEL_ANY)) |
4bf94615 JA |
7117 | req = io_poll_file_find(ctx, cd); |
7118 | else | |
7119 | req = io_poll_find(ctx, false, cd); | |
b2cb805f JA |
7120 | if (!req) |
7121 | return -ENOENT; | |
aa43477b PB |
7122 | io_poll_cancel_req(req); |
7123 | return 0; | |
47f46768 JA |
7124 | } |
7125 | ||
9096af3e PB |
7126 | static __poll_t io_poll_parse_events(const struct io_uring_sqe *sqe, |
7127 | unsigned int flags) | |
7128 | { | |
7129 | u32 events; | |
47f46768 | 7130 | |
9096af3e PB |
7131 | events = READ_ONCE(sqe->poll32_events); |
7132 | #ifdef __BIG_ENDIAN | |
7133 | events = swahw32(events); | |
7134 | #endif | |
7135 | if (!(flags & IORING_POLL_ADD_MULTI)) | |
7136 | events |= EPOLLONESHOT; | |
7137 | return demangle_poll(events) | (events & (EPOLLEXCLUSIVE|EPOLLONESHOT)); | |
47f46768 JA |
7138 | } |
7139 | ||
c5de0036 | 7140 | static int io_poll_update_prep(struct io_kiocb *req, |
3529d8c2 | 7141 | const struct io_uring_sqe *sqe) |
0969e783 | 7142 | { |
c5de0036 PB |
7143 | struct io_poll_update *upd = &req->poll_update; |
7144 | u32 flags; | |
7145 | ||
73911426 | 7146 | if (sqe->buf_index || sqe->splice_fd_in) |
c5de0036 PB |
7147 | return -EINVAL; |
7148 | flags = READ_ONCE(sqe->len); | |
7149 | if (flags & ~(IORING_POLL_UPDATE_EVENTS | IORING_POLL_UPDATE_USER_DATA | | |
7150 | IORING_POLL_ADD_MULTI)) | |
7151 | return -EINVAL; | |
7152 | /* meaningless without update */ | |
7153 | if (flags == IORING_POLL_ADD_MULTI) | |
0969e783 JA |
7154 | return -EINVAL; |
7155 | ||
c5de0036 PB |
7156 | upd->old_user_data = READ_ONCE(sqe->addr); |
7157 | upd->update_events = flags & IORING_POLL_UPDATE_EVENTS; | |
7158 | upd->update_user_data = flags & IORING_POLL_UPDATE_USER_DATA; | |
221c5eb2 | 7159 | |
c5de0036 PB |
7160 | upd->new_user_data = READ_ONCE(sqe->off); |
7161 | if (!upd->update_user_data && upd->new_user_data) | |
7162 | return -EINVAL; | |
7163 | if (upd->update_events) | |
7164 | upd->events = io_poll_parse_events(sqe, flags); | |
7165 | else if (sqe->poll32_events) | |
7166 | return -EINVAL; | |
221c5eb2 | 7167 | |
221c5eb2 JA |
7168 | return 0; |
7169 | } | |
7170 | ||
3529d8c2 | 7171 | static int io_poll_add_prep(struct io_kiocb *req, const struct io_uring_sqe *sqe) |
221c5eb2 JA |
7172 | { |
7173 | struct io_poll_iocb *poll = &req->poll; | |
c5de0036 | 7174 | u32 flags; |
221c5eb2 | 7175 | |
73911426 | 7176 | if (sqe->buf_index || sqe->off || sqe->addr) |
88e41cf9 JA |
7177 | return -EINVAL; |
7178 | flags = READ_ONCE(sqe->len); | |
c5de0036 | 7179 | if (flags & ~IORING_POLL_ADD_MULTI) |
221c5eb2 | 7180 | return -EINVAL; |
04c76b41 PB |
7181 | if ((flags & IORING_POLL_ADD_MULTI) && (req->flags & REQ_F_CQE_SKIP)) |
7182 | return -EINVAL; | |
221c5eb2 | 7183 | |
48dcd38d | 7184 | io_req_set_refcount(req); |
2804ecd8 | 7185 | req->apoll_events = poll->events = io_poll_parse_events(sqe, flags); |
0969e783 JA |
7186 | return 0; |
7187 | } | |
7188 | ||
61e98203 | 7189 | static int io_poll_add(struct io_kiocb *req, unsigned int issue_flags) |
0969e783 JA |
7190 | { |
7191 | struct io_poll_iocb *poll = &req->poll; | |
0969e783 | 7192 | struct io_poll_table ipt; |
aa43477b | 7193 | int ret; |
0969e783 | 7194 | |
d7718a9d | 7195 | ipt.pt._qproc = io_poll_queue_proc; |
36703247 | 7196 | |
aa43477b PB |
7197 | ret = __io_arm_poll_handler(req, &req->poll, &ipt, poll->events); |
7198 | ret = ret ?: ipt.error; | |
7199 | if (ret) | |
7200 | __io_req_complete(req, issue_flags, ret, 0); | |
7201 | return 0; | |
221c5eb2 JA |
7202 | } |
7203 | ||
c5de0036 | 7204 | static int io_poll_update(struct io_kiocb *req, unsigned int issue_flags) |
b69de288 | 7205 | { |
b21432b4 | 7206 | struct io_cancel_data cd = { .data = req->poll_update.old_user_data, }; |
b69de288 JA |
7207 | struct io_ring_ctx *ctx = req->ctx; |
7208 | struct io_kiocb *preq; | |
2bbb146d | 7209 | int ret2, ret = 0; |
cc8e9ba7 | 7210 | bool locked; |
b69de288 | 7211 | |
79ebeaee | 7212 | spin_lock(&ctx->completion_lock); |
b21432b4 | 7213 | preq = io_poll_find(ctx, true, &cd); |
aa43477b | 7214 | if (!preq || !io_poll_disarm(preq)) { |
79ebeaee | 7215 | spin_unlock(&ctx->completion_lock); |
aa43477b | 7216 | ret = preq ? -EALREADY : -ENOENT; |
2bbb146d | 7217 | goto out; |
b69de288 | 7218 | } |
79ebeaee | 7219 | spin_unlock(&ctx->completion_lock); |
cb3b200e | 7220 | |
2bbb146d PB |
7221 | if (req->poll_update.update_events || req->poll_update.update_user_data) { |
7222 | /* only mask one event flags, keep behavior flags */ | |
7223 | if (req->poll_update.update_events) { | |
7224 | preq->poll.events &= ~0xffff; | |
7225 | preq->poll.events |= req->poll_update.events & 0xffff; | |
7226 | preq->poll.events |= IO_POLL_UNMASK; | |
cb3b200e | 7227 | } |
2bbb146d | 7228 | if (req->poll_update.update_user_data) |
cef216fc | 7229 | preq->cqe.user_data = req->poll_update.new_user_data; |
b69de288 | 7230 | |
2bbb146d PB |
7231 | ret2 = io_poll_add(preq, issue_flags); |
7232 | /* successfully updated, don't complete poll request */ | |
7233 | if (!ret2) | |
7234 | goto out; | |
b69de288 | 7235 | } |
6224590d | 7236 | |
2bbb146d | 7237 | req_set_fail(preq); |
cef216fc | 7238 | preq->cqe.res = -ECANCELED; |
cc8e9ba7 PB |
7239 | locked = !(issue_flags & IO_URING_F_UNLOCKED); |
7240 | io_req_task_complete(preq, &locked); | |
2bbb146d PB |
7241 | out: |
7242 | if (ret < 0) | |
6224590d | 7243 | req_set_fail(req); |
2bbb146d | 7244 | /* complete update request, we're done with it */ |
cc8e9ba7 | 7245 | __io_req_complete(req, issue_flags, ret, 0); |
b69de288 | 7246 | return 0; |
89850fce JA |
7247 | } |
7248 | ||
5262f567 JA |
7249 | static enum hrtimer_restart io_timeout_fn(struct hrtimer *timer) |
7250 | { | |
ad8a48ac JA |
7251 | struct io_timeout_data *data = container_of(timer, |
7252 | struct io_timeout_data, timer); | |
7253 | struct io_kiocb *req = data->req; | |
7254 | struct io_ring_ctx *ctx = req->ctx; | |
5262f567 JA |
7255 | unsigned long flags; |
7256 | ||
89850fce | 7257 | spin_lock_irqsave(&ctx->timeout_lock, flags); |
a71976f3 | 7258 | list_del_init(&req->timeout.list); |
01cec8c1 PB |
7259 | atomic_set(&req->ctx->cq_timeouts, |
7260 | atomic_read(&req->ctx->cq_timeouts) + 1); | |
89850fce | 7261 | spin_unlock_irqrestore(&ctx->timeout_lock, flags); |
01cec8c1 | 7262 | |
a90c8bf6 PB |
7263 | if (!(data->flags & IORING_TIMEOUT_ETIME_SUCCESS)) |
7264 | req_set_fail(req); | |
7265 | ||
cef216fc | 7266 | req->cqe.res = -ETIME; |
a90c8bf6 | 7267 | req->io_task_work.func = io_req_task_complete; |
4813c377 | 7268 | io_req_task_work_add(req, false); |
5262f567 JA |
7269 | return HRTIMER_NORESTART; |
7270 | } | |
7271 | ||
fbd15848 | 7272 | static struct io_kiocb *io_timeout_extract(struct io_ring_ctx *ctx, |
b21432b4 | 7273 | struct io_cancel_data *cd) |
89850fce | 7274 | __must_hold(&ctx->timeout_lock) |
f254ac04 | 7275 | { |
fbd15848 | 7276 | struct io_timeout_data *io; |
47f46768 | 7277 | struct io_kiocb *req; |
fd9c7bc5 | 7278 | bool found = false; |
f254ac04 | 7279 | |
135fcde8 | 7280 | list_for_each_entry(req, &ctx->timeout_list, timeout.list) { |
970f256e JA |
7281 | if (!(cd->flags & IORING_ASYNC_CANCEL_ANY) && |
7282 | cd->data != req->cqe.user_data) | |
8e29da69 | 7283 | continue; |
970f256e | 7284 | if (cd->flags & (IORING_ASYNC_CANCEL_ALL|IORING_ASYNC_CANCEL_ANY)) { |
8e29da69 JA |
7285 | if (cd->seq == req->work.cancel_seq) |
7286 | continue; | |
7287 | req->work.cancel_seq = cd->seq; | |
7288 | } | |
7289 | found = true; | |
7290 | break; | |
47f46768 | 7291 | } |
fd9c7bc5 PB |
7292 | if (!found) |
7293 | return ERR_PTR(-ENOENT); | |
fbd15848 PB |
7294 | |
7295 | io = req->async_data; | |
fd9c7bc5 | 7296 | if (hrtimer_try_to_cancel(&io->timer) == -1) |
fbd15848 | 7297 | return ERR_PTR(-EALREADY); |
a71976f3 | 7298 | list_del_init(&req->timeout.list); |
fbd15848 PB |
7299 | return req; |
7300 | } | |
47f46768 | 7301 | |
b21432b4 | 7302 | static int io_timeout_cancel(struct io_ring_ctx *ctx, struct io_cancel_data *cd) |
ec3c3d0f | 7303 | __must_hold(&ctx->completion_lock) |
fbd15848 | 7304 | { |
3645c200 PB |
7305 | struct io_kiocb *req; |
7306 | ||
7307 | spin_lock_irq(&ctx->timeout_lock); | |
b21432b4 | 7308 | req = io_timeout_extract(ctx, cd); |
3645c200 | 7309 | spin_unlock_irq(&ctx->timeout_lock); |
fbd15848 PB |
7310 | |
7311 | if (IS_ERR(req)) | |
7312 | return PTR_ERR(req); | |
6695490d | 7313 | io_req_task_queue_fail(req, -ECANCELED); |
f254ac04 JA |
7314 | return 0; |
7315 | } | |
7316 | ||
50c1df2b JA |
7317 | static clockid_t io_timeout_get_clock(struct io_timeout_data *data) |
7318 | { | |
7319 | switch (data->flags & IORING_TIMEOUT_CLOCK_MASK) { | |
7320 | case IORING_TIMEOUT_BOOTTIME: | |
7321 | return CLOCK_BOOTTIME; | |
7322 | case IORING_TIMEOUT_REALTIME: | |
7323 | return CLOCK_REALTIME; | |
7324 | default: | |
7325 | /* can't happen, vetted at prep time */ | |
7326 | WARN_ON_ONCE(1); | |
7327 | fallthrough; | |
7328 | case 0: | |
7329 | return CLOCK_MONOTONIC; | |
7330 | } | |
7331 | } | |
7332 | ||
f1042b6c PB |
7333 | static int io_linked_timeout_update(struct io_ring_ctx *ctx, __u64 user_data, |
7334 | struct timespec64 *ts, enum hrtimer_mode mode) | |
7335 | __must_hold(&ctx->timeout_lock) | |
7336 | { | |
7337 | struct io_timeout_data *io; | |
7338 | struct io_kiocb *req; | |
7339 | bool found = false; | |
7340 | ||
7341 | list_for_each_entry(req, &ctx->ltimeout_list, timeout.list) { | |
cef216fc | 7342 | found = user_data == req->cqe.user_data; |
f1042b6c PB |
7343 | if (found) |
7344 | break; | |
7345 | } | |
7346 | if (!found) | |
7347 | return -ENOENT; | |
7348 | ||
7349 | io = req->async_data; | |
7350 | if (hrtimer_try_to_cancel(&io->timer) == -1) | |
7351 | return -EALREADY; | |
7352 | hrtimer_init(&io->timer, io_timeout_get_clock(io), mode); | |
7353 | io->timer.function = io_link_timeout_fn; | |
7354 | hrtimer_start(&io->timer, timespec64_to_ktime(*ts), mode); | |
7355 | return 0; | |
7356 | } | |
7357 | ||
9c8e11b3 PB |
7358 | static int io_timeout_update(struct io_ring_ctx *ctx, __u64 user_data, |
7359 | struct timespec64 *ts, enum hrtimer_mode mode) | |
89850fce | 7360 | __must_hold(&ctx->timeout_lock) |
47f46768 | 7361 | { |
b21432b4 JA |
7362 | struct io_cancel_data cd = { .data = user_data, }; |
7363 | struct io_kiocb *req = io_timeout_extract(ctx, &cd); | |
9c8e11b3 | 7364 | struct io_timeout_data *data; |
47f46768 | 7365 | |
9c8e11b3 PB |
7366 | if (IS_ERR(req)) |
7367 | return PTR_ERR(req); | |
47f46768 | 7368 | |
9c8e11b3 PB |
7369 | req->timeout.off = 0; /* noseq */ |
7370 | data = req->async_data; | |
7371 | list_add_tail(&req->timeout.list, &ctx->timeout_list); | |
50c1df2b | 7372 | hrtimer_init(&data->timer, io_timeout_get_clock(data), mode); |
9c8e11b3 PB |
7373 | data->timer.function = io_timeout_fn; |
7374 | hrtimer_start(&data->timer, timespec64_to_ktime(*ts), mode); | |
7375 | return 0; | |
47f46768 JA |
7376 | } |
7377 | ||
3529d8c2 JA |
7378 | static int io_timeout_remove_prep(struct io_kiocb *req, |
7379 | const struct io_uring_sqe *sqe) | |
b29472ee | 7380 | { |
9c8e11b3 PB |
7381 | struct io_timeout_rem *tr = &req->timeout_rem; |
7382 | ||
61710e43 DA |
7383 | if (unlikely(req->flags & (REQ_F_FIXED_FILE | REQ_F_BUFFER_SELECT))) |
7384 | return -EINVAL; | |
73911426 | 7385 | if (sqe->buf_index || sqe->len || sqe->splice_fd_in) |
b29472ee JA |
7386 | return -EINVAL; |
7387 | ||
f1042b6c | 7388 | tr->ltimeout = false; |
9c8e11b3 PB |
7389 | tr->addr = READ_ONCE(sqe->addr); |
7390 | tr->flags = READ_ONCE(sqe->timeout_flags); | |
f1042b6c PB |
7391 | if (tr->flags & IORING_TIMEOUT_UPDATE_MASK) { |
7392 | if (hweight32(tr->flags & IORING_TIMEOUT_CLOCK_MASK) > 1) | |
7393 | return -EINVAL; | |
7394 | if (tr->flags & IORING_LINK_TIMEOUT_UPDATE) | |
7395 | tr->ltimeout = true; | |
7396 | if (tr->flags & ~(IORING_TIMEOUT_UPDATE_MASK|IORING_TIMEOUT_ABS)) | |
9c8e11b3 PB |
7397 | return -EINVAL; |
7398 | if (get_timespec64(&tr->ts, u64_to_user_ptr(sqe->addr2))) | |
7399 | return -EFAULT; | |
2087009c YB |
7400 | if (tr->ts.tv_sec < 0 || tr->ts.tv_nsec < 0) |
7401 | return -EINVAL; | |
9c8e11b3 PB |
7402 | } else if (tr->flags) { |
7403 | /* timeout removal doesn't support flags */ | |
b29472ee | 7404 | return -EINVAL; |
9c8e11b3 | 7405 | } |
b29472ee | 7406 | |
b29472ee JA |
7407 | return 0; |
7408 | } | |
7409 | ||
8662daec PB |
7410 | static inline enum hrtimer_mode io_translate_timeout_mode(unsigned int flags) |
7411 | { | |
7412 | return (flags & IORING_TIMEOUT_ABS) ? HRTIMER_MODE_ABS | |
7413 | : HRTIMER_MODE_REL; | |
7414 | } | |
7415 | ||
11365043 JA |
7416 | /* |
7417 | * Remove or update an existing timeout command | |
7418 | */ | |
61e98203 | 7419 | static int io_timeout_remove(struct io_kiocb *req, unsigned int issue_flags) |
11365043 | 7420 | { |
9c8e11b3 | 7421 | struct io_timeout_rem *tr = &req->timeout_rem; |
11365043 | 7422 | struct io_ring_ctx *ctx = req->ctx; |
47f46768 | 7423 | int ret; |
11365043 | 7424 | |
ec3c3d0f | 7425 | if (!(req->timeout_rem.flags & IORING_TIMEOUT_UPDATE)) { |
b21432b4 JA |
7426 | struct io_cancel_data cd = { .data = tr->addr, }; |
7427 | ||
ec3c3d0f | 7428 | spin_lock(&ctx->completion_lock); |
b21432b4 | 7429 | ret = io_timeout_cancel(ctx, &cd); |
ec3c3d0f PB |
7430 | spin_unlock(&ctx->completion_lock); |
7431 | } else { | |
f1042b6c PB |
7432 | enum hrtimer_mode mode = io_translate_timeout_mode(tr->flags); |
7433 | ||
ec3c3d0f | 7434 | spin_lock_irq(&ctx->timeout_lock); |
f1042b6c PB |
7435 | if (tr->ltimeout) |
7436 | ret = io_linked_timeout_update(ctx, tr->addr, &tr->ts, mode); | |
7437 | else | |
7438 | ret = io_timeout_update(ctx, tr->addr, &tr->ts, mode); | |
ec3c3d0f PB |
7439 | spin_unlock_irq(&ctx->timeout_lock); |
7440 | } | |
11365043 | 7441 | |
4e88d6e7 | 7442 | if (ret < 0) |
93d2bcd2 | 7443 | req_set_fail(req); |
505657bc | 7444 | io_req_complete_post(req, ret, 0); |
11365043 | 7445 | return 0; |
5262f567 JA |
7446 | } |
7447 | ||
3529d8c2 | 7448 | static int io_timeout_prep(struct io_kiocb *req, const struct io_uring_sqe *sqe, |
2d28390a | 7449 | bool is_timeout_link) |
5262f567 | 7450 | { |
ad8a48ac | 7451 | struct io_timeout_data *data; |
a41525ab | 7452 | unsigned flags; |
56080b02 | 7453 | u32 off = READ_ONCE(sqe->off); |
5262f567 | 7454 | |
73911426 | 7455 | if (sqe->buf_index || sqe->len != 1 || sqe->splice_fd_in) |
a41525ab | 7456 | return -EINVAL; |
56080b02 | 7457 | if (off && is_timeout_link) |
2d28390a | 7458 | return -EINVAL; |
a41525ab | 7459 | flags = READ_ONCE(sqe->timeout_flags); |
6224590d PB |
7460 | if (flags & ~(IORING_TIMEOUT_ABS | IORING_TIMEOUT_CLOCK_MASK | |
7461 | IORING_TIMEOUT_ETIME_SUCCESS)) | |
50c1df2b JA |
7462 | return -EINVAL; |
7463 | /* more than one clock specified is invalid, obviously */ | |
7464 | if (hweight32(flags & IORING_TIMEOUT_CLOCK_MASK) > 1) | |
5262f567 | 7465 | return -EINVAL; |
bdf20073 | 7466 | |
ef9dd637 | 7467 | INIT_LIST_HEAD(&req->timeout.list); |
bfe68a22 | 7468 | req->timeout.off = off; |
f18ee4cf PB |
7469 | if (unlikely(off && !req->ctx->off_timeout_used)) |
7470 | req->ctx->off_timeout_used = true; | |
26a61679 | 7471 | |
d6a644a7 PB |
7472 | if (WARN_ON_ONCE(req_has_async_data(req))) |
7473 | return -EFAULT; | |
7474 | if (io_alloc_async_data(req)) | |
26a61679 JA |
7475 | return -ENOMEM; |
7476 | ||
e8c2bc1f | 7477 | data = req->async_data; |
ad8a48ac | 7478 | data->req = req; |
50c1df2b | 7479 | data->flags = flags; |
ad8a48ac JA |
7480 | |
7481 | if (get_timespec64(&data->ts, u64_to_user_ptr(sqe->addr))) | |
5262f567 JA |
7482 | return -EFAULT; |
7483 | ||
f6223ff7 YB |
7484 | if (data->ts.tv_sec < 0 || data->ts.tv_nsec < 0) |
7485 | return -EINVAL; | |
7486 | ||
e677edbc | 7487 | INIT_LIST_HEAD(&req->timeout.list); |
8662daec | 7488 | data->mode = io_translate_timeout_mode(flags); |
50c1df2b | 7489 | hrtimer_init(&data->timer, io_timeout_get_clock(data), data->mode); |
b97e736a PB |
7490 | |
7491 | if (is_timeout_link) { | |
7492 | struct io_submit_link *link = &req->ctx->submit_state.link; | |
7493 | ||
7494 | if (!link->head) | |
7495 | return -EINVAL; | |
7496 | if (link->last->opcode == IORING_OP_LINK_TIMEOUT) | |
7497 | return -EINVAL; | |
4d13d1a4 PB |
7498 | req->timeout.head = link->last; |
7499 | link->last->flags |= REQ_F_ARM_LTIMEOUT; | |
b97e736a | 7500 | } |
ad8a48ac JA |
7501 | return 0; |
7502 | } | |
7503 | ||
61e98203 | 7504 | static int io_timeout(struct io_kiocb *req, unsigned int issue_flags) |
ad8a48ac | 7505 | { |
ad8a48ac | 7506 | struct io_ring_ctx *ctx = req->ctx; |
e8c2bc1f | 7507 | struct io_timeout_data *data = req->async_data; |
ad8a48ac | 7508 | struct list_head *entry; |
bfe68a22 | 7509 | u32 tail, off = req->timeout.off; |
ad8a48ac | 7510 | |
89850fce | 7511 | spin_lock_irq(&ctx->timeout_lock); |
93bd25bb | 7512 | |
5262f567 JA |
7513 | /* |
7514 | * sqe->off holds how many events that need to occur for this | |
93bd25bb JA |
7515 | * timeout event to be satisfied. If it isn't set, then this is |
7516 | * a pure timeout request, sequence isn't used. | |
5262f567 | 7517 | */ |
8eb7e2d0 | 7518 | if (io_is_timeout_noseq(req)) { |
93bd25bb JA |
7519 | entry = ctx->timeout_list.prev; |
7520 | goto add; | |
7521 | } | |
5262f567 | 7522 | |
bfe68a22 PB |
7523 | tail = ctx->cached_cq_tail - atomic_read(&ctx->cq_timeouts); |
7524 | req->timeout.target_seq = tail + off; | |
5262f567 | 7525 | |
f010505b MDG |
7526 | /* Update the last seq here in case io_flush_timeouts() hasn't. |
7527 | * This is safe because ->completion_lock is held, and submissions | |
7528 | * and completions are never mixed in the same ->completion_lock section. | |
7529 | */ | |
7530 | ctx->cq_last_tm_flush = tail; | |
7531 | ||
5262f567 JA |
7532 | /* |
7533 | * Insertion sort, ensuring the first entry in the list is always | |
7534 | * the one we need first. | |
7535 | */ | |
5262f567 | 7536 | list_for_each_prev(entry, &ctx->timeout_list) { |
135fcde8 PB |
7537 | struct io_kiocb *nxt = list_entry(entry, struct io_kiocb, |
7538 | timeout.list); | |
5262f567 | 7539 | |
8eb7e2d0 | 7540 | if (io_is_timeout_noseq(nxt)) |
93bd25bb | 7541 | continue; |
bfe68a22 PB |
7542 | /* nxt.seq is behind @tail, otherwise would've been completed */ |
7543 | if (off >= nxt->timeout.target_seq - tail) | |
5262f567 JA |
7544 | break; |
7545 | } | |
93bd25bb | 7546 | add: |
135fcde8 | 7547 | list_add(&req->timeout.list, entry); |
ad8a48ac JA |
7548 | data->timer.function = io_timeout_fn; |
7549 | hrtimer_start(&data->timer, timespec64_to_ktime(data->ts), data->mode); | |
89850fce | 7550 | spin_unlock_irq(&ctx->timeout_lock); |
5262f567 JA |
7551 | return 0; |
7552 | } | |
5262f567 | 7553 | |
62755e35 JA |
7554 | static bool io_cancel_cb(struct io_wq_work *work, void *data) |
7555 | { | |
7556 | struct io_kiocb *req = container_of(work, struct io_kiocb, work); | |
f458dd84 | 7557 | struct io_cancel_data *cd = data; |
62755e35 | 7558 | |
8e29da69 JA |
7559 | if (req->ctx != cd->ctx) |
7560 | return false; | |
970f256e JA |
7561 | if (cd->flags & IORING_ASYNC_CANCEL_ANY) { |
7562 | ; | |
7563 | } else if (cd->flags & IORING_ASYNC_CANCEL_FD) { | |
4bf94615 JA |
7564 | if (req->file != cd->file) |
7565 | return false; | |
7566 | } else { | |
7567 | if (req->cqe.user_data != cd->data) | |
7568 | return false; | |
7569 | } | |
970f256e | 7570 | if (cd->flags & (IORING_ASYNC_CANCEL_ALL|IORING_ASYNC_CANCEL_ANY)) { |
8e29da69 JA |
7571 | if (cd->seq == req->work.cancel_seq) |
7572 | return false; | |
7573 | req->work.cancel_seq = cd->seq; | |
7574 | } | |
7575 | return true; | |
62755e35 JA |
7576 | } |
7577 | ||
b21432b4 JA |
7578 | static int io_async_cancel_one(struct io_uring_task *tctx, |
7579 | struct io_cancel_data *cd) | |
62755e35 | 7580 | { |
62755e35 | 7581 | enum io_wq_cancel cancel_ret; |
62755e35 | 7582 | int ret = 0; |
970f256e | 7583 | bool all; |
62755e35 | 7584 | |
f458dd84 | 7585 | if (!tctx || !tctx->io_wq) |
5aa75ed5 JA |
7586 | return -ENOENT; |
7587 | ||
970f256e JA |
7588 | all = cd->flags & (IORING_ASYNC_CANCEL_ALL|IORING_ASYNC_CANCEL_ANY); |
7589 | cancel_ret = io_wq_cancel_cb(tctx->io_wq, io_cancel_cb, cd, all); | |
62755e35 JA |
7590 | switch (cancel_ret) { |
7591 | case IO_WQ_CANCEL_OK: | |
7592 | ret = 0; | |
7593 | break; | |
7594 | case IO_WQ_CANCEL_RUNNING: | |
7595 | ret = -EALREADY; | |
7596 | break; | |
7597 | case IO_WQ_CANCEL_NOTFOUND: | |
7598 | ret = -ENOENT; | |
7599 | break; | |
7600 | } | |
7601 | ||
e977d6d3 JA |
7602 | return ret; |
7603 | } | |
7604 | ||
b21432b4 | 7605 | static int io_try_cancel(struct io_kiocb *req, struct io_cancel_data *cd) |
47f46768 | 7606 | { |
8cb01fac | 7607 | struct io_ring_ctx *ctx = req->ctx; |
47f46768 JA |
7608 | int ret; |
7609 | ||
dadebc35 | 7610 | WARN_ON_ONCE(!io_wq_current_is_worker() && req->task != current); |
8cb01fac | 7611 | |
b21432b4 | 7612 | ret = io_async_cancel_one(req->task->io_uring, cd); |
ccbf7261 JA |
7613 | /* |
7614 | * Fall-through even for -EALREADY, as we may have poll armed | |
7615 | * that need unarming. | |
7616 | */ | |
7617 | if (!ret) | |
7618 | return 0; | |
505657bc PB |
7619 | |
7620 | spin_lock(&ctx->completion_lock); | |
b21432b4 | 7621 | ret = io_poll_cancel(ctx, cd); |
ccbf7261 JA |
7622 | if (ret != -ENOENT) |
7623 | goto out; | |
4bf94615 JA |
7624 | if (!(cd->flags & IORING_ASYNC_CANCEL_FD)) |
7625 | ret = io_timeout_cancel(ctx, cd); | |
505657bc PB |
7626 | out: |
7627 | spin_unlock(&ctx->completion_lock); | |
7628 | return ret; | |
47f46768 JA |
7629 | } |
7630 | ||
970f256e JA |
7631 | #define CANCEL_FLAGS (IORING_ASYNC_CANCEL_ALL | IORING_ASYNC_CANCEL_FD | \ |
7632 | IORING_ASYNC_CANCEL_ANY) | |
7633 | ||
3529d8c2 JA |
7634 | static int io_async_cancel_prep(struct io_kiocb *req, |
7635 | const struct io_uring_sqe *sqe) | |
e977d6d3 | 7636 | { |
4bf94615 | 7637 | if (unlikely(req->flags & REQ_F_BUFFER_SELECT)) |
61710e43 | 7638 | return -EINVAL; |
73911426 | 7639 | if (sqe->off || sqe->len || sqe->splice_fd_in) |
e977d6d3 JA |
7640 | return -EINVAL; |
7641 | ||
fbf23849 | 7642 | req->cancel.addr = READ_ONCE(sqe->addr); |
8e29da69 | 7643 | req->cancel.flags = READ_ONCE(sqe->cancel_flags); |
970f256e | 7644 | if (req->cancel.flags & ~CANCEL_FLAGS) |
8e29da69 | 7645 | return -EINVAL; |
970f256e JA |
7646 | if (req->cancel.flags & IORING_ASYNC_CANCEL_FD) { |
7647 | if (req->cancel.flags & IORING_ASYNC_CANCEL_ANY) | |
7648 | return -EINVAL; | |
4bf94615 | 7649 | req->cancel.fd = READ_ONCE(sqe->fd); |
970f256e | 7650 | } |
8e29da69 | 7651 | |
fbf23849 JA |
7652 | return 0; |
7653 | } | |
7654 | ||
8e29da69 JA |
7655 | static int __io_async_cancel(struct io_cancel_data *cd, struct io_kiocb *req, |
7656 | unsigned int issue_flags) | |
fbf23849 | 7657 | { |
970f256e | 7658 | bool all = cd->flags & (IORING_ASYNC_CANCEL_ALL|IORING_ASYNC_CANCEL_ANY); |
8e29da69 | 7659 | struct io_ring_ctx *ctx = cd->ctx; |
58f99373 | 7660 | struct io_tctx_node *node; |
8e29da69 | 7661 | int ret, nr = 0; |
58f99373 | 7662 | |
8e29da69 JA |
7663 | do { |
7664 | ret = io_try_cancel(req, cd); | |
7665 | if (ret == -ENOENT) | |
7666 | break; | |
970f256e | 7667 | if (!all) |
8e29da69 JA |
7668 | return ret; |
7669 | nr++; | |
7670 | } while (1); | |
58f99373 PB |
7671 | |
7672 | /* slow path, try all io-wq's */ | |
f8929630 | 7673 | io_ring_submit_lock(ctx, issue_flags); |
58f99373 PB |
7674 | ret = -ENOENT; |
7675 | list_for_each_entry(node, &ctx->tctx_list, ctx_node) { | |
7676 | struct io_uring_task *tctx = node->task->io_uring; | |
fbf23849 | 7677 | |
8e29da69 JA |
7678 | ret = io_async_cancel_one(tctx, cd); |
7679 | if (ret != -ENOENT) { | |
970f256e | 7680 | if (!all) |
8e29da69 JA |
7681 | break; |
7682 | nr++; | |
7683 | } | |
58f99373 | 7684 | } |
f8929630 | 7685 | io_ring_submit_unlock(ctx, issue_flags); |
970f256e | 7686 | return all ? nr : ret; |
8e29da69 JA |
7687 | } |
7688 | ||
7689 | static int io_async_cancel(struct io_kiocb *req, unsigned int issue_flags) | |
7690 | { | |
7691 | struct io_cancel_data cd = { | |
7692 | .ctx = req->ctx, | |
7693 | .data = req->cancel.addr, | |
7694 | .flags = req->cancel.flags, | |
7695 | .seq = atomic_inc_return(&req->ctx->cancel_seq), | |
7696 | }; | |
7697 | int ret; | |
7698 | ||
4bf94615 JA |
7699 | if (cd.flags & IORING_ASYNC_CANCEL_FD) { |
7700 | if (req->flags & REQ_F_FIXED_FILE) | |
7701 | req->file = io_file_get_fixed(req, req->cancel.fd, | |
7702 | issue_flags); | |
7703 | else | |
7704 | req->file = io_file_get_normal(req, req->cancel.fd); | |
7705 | if (!req->file) { | |
7706 | ret = -EBADF; | |
7707 | goto done; | |
7708 | } | |
7709 | cd.file = req->file; | |
7710 | } | |
7711 | ||
8e29da69 | 7712 | ret = __io_async_cancel(&cd, req, issue_flags); |
58f99373 | 7713 | done: |
58f99373 | 7714 | if (ret < 0) |
93d2bcd2 | 7715 | req_set_fail(req); |
505657bc | 7716 | io_req_complete_post(req, ret, 0); |
5262f567 JA |
7717 | return 0; |
7718 | } | |
7719 | ||
269bbe5f | 7720 | static int io_rsrc_update_prep(struct io_kiocb *req, |
05f3fb3c JA |
7721 | const struct io_uring_sqe *sqe) |
7722 | { | |
61710e43 DA |
7723 | if (unlikely(req->flags & (REQ_F_FIXED_FILE | REQ_F_BUFFER_SELECT))) |
7724 | return -EINVAL; | |
73911426 | 7725 | if (sqe->rw_flags || sqe->splice_fd_in) |
05f3fb3c JA |
7726 | return -EINVAL; |
7727 | ||
269bbe5f BM |
7728 | req->rsrc_update.offset = READ_ONCE(sqe->off); |
7729 | req->rsrc_update.nr_args = READ_ONCE(sqe->len); | |
7730 | if (!req->rsrc_update.nr_args) | |
05f3fb3c | 7731 | return -EINVAL; |
269bbe5f | 7732 | req->rsrc_update.arg = READ_ONCE(sqe->addr); |
05f3fb3c JA |
7733 | return 0; |
7734 | } | |
7735 | ||
889fca73 | 7736 | static int io_files_update(struct io_kiocb *req, unsigned int issue_flags) |
fbf23849 JA |
7737 | { |
7738 | struct io_ring_ctx *ctx = req->ctx; | |
c3bdad02 | 7739 | struct io_uring_rsrc_update2 up; |
05f3fb3c | 7740 | int ret; |
fbf23849 | 7741 | |
269bbe5f BM |
7742 | up.offset = req->rsrc_update.offset; |
7743 | up.data = req->rsrc_update.arg; | |
c3bdad02 PB |
7744 | up.nr = 0; |
7745 | up.tags = 0; | |
615cee49 | 7746 | up.resv = 0; |
d8a3ba9c | 7747 | up.resv2 = 0; |
05f3fb3c | 7748 | |
f8929630 | 7749 | io_ring_submit_lock(ctx, issue_flags); |
fdecb662 | 7750 | ret = __io_register_rsrc_update(ctx, IORING_RSRC_FILE, |
98f0b3b4 | 7751 | &up, req->rsrc_update.nr_args); |
f8929630 | 7752 | io_ring_submit_unlock(ctx, issue_flags); |
05f3fb3c JA |
7753 | |
7754 | if (ret < 0) | |
93d2bcd2 | 7755 | req_set_fail(req); |
889fca73 | 7756 | __io_req_complete(req, issue_flags, ret, 0); |
5262f567 JA |
7757 | return 0; |
7758 | } | |
7759 | ||
bfe76559 | 7760 | static int io_req_prep(struct io_kiocb *req, const struct io_uring_sqe *sqe) |
f67676d1 | 7761 | { |
d625c6ee | 7762 | switch (req->opcode) { |
e781573e | 7763 | case IORING_OP_NOP: |
2bb04df7 | 7764 | return io_nop_prep(req, sqe); |
f67676d1 JA |
7765 | case IORING_OP_READV: |
7766 | case IORING_OP_READ_FIXED: | |
3a6820f2 | 7767 | case IORING_OP_READ: |
f67676d1 JA |
7768 | case IORING_OP_WRITEV: |
7769 | case IORING_OP_WRITE_FIXED: | |
3a6820f2 | 7770 | case IORING_OP_WRITE: |
584b0180 | 7771 | return io_prep_rw(req, sqe); |
0969e783 | 7772 | case IORING_OP_POLL_ADD: |
bfe76559 | 7773 | return io_poll_add_prep(req, sqe); |
0969e783 | 7774 | case IORING_OP_POLL_REMOVE: |
c5de0036 | 7775 | return io_poll_update_prep(req, sqe); |
8ed8d3c3 | 7776 | case IORING_OP_FSYNC: |
1155c76a | 7777 | return io_fsync_prep(req, sqe); |
8ed8d3c3 | 7778 | case IORING_OP_SYNC_FILE_RANGE: |
1155c76a | 7779 | return io_sfr_prep(req, sqe); |
03b1230c | 7780 | case IORING_OP_SENDMSG: |
fddaface | 7781 | case IORING_OP_SEND: |
bfe76559 | 7782 | return io_sendmsg_prep(req, sqe); |
03b1230c | 7783 | case IORING_OP_RECVMSG: |
fddaface | 7784 | case IORING_OP_RECV: |
bfe76559 | 7785 | return io_recvmsg_prep(req, sqe); |
f499a021 | 7786 | case IORING_OP_CONNECT: |
bfe76559 | 7787 | return io_connect_prep(req, sqe); |
2d28390a | 7788 | case IORING_OP_TIMEOUT: |
bfe76559 | 7789 | return io_timeout_prep(req, sqe, false); |
b29472ee | 7790 | case IORING_OP_TIMEOUT_REMOVE: |
bfe76559 | 7791 | return io_timeout_remove_prep(req, sqe); |
fbf23849 | 7792 | case IORING_OP_ASYNC_CANCEL: |
bfe76559 | 7793 | return io_async_cancel_prep(req, sqe); |
2d28390a | 7794 | case IORING_OP_LINK_TIMEOUT: |
bfe76559 | 7795 | return io_timeout_prep(req, sqe, true); |
8ed8d3c3 | 7796 | case IORING_OP_ACCEPT: |
bfe76559 | 7797 | return io_accept_prep(req, sqe); |
d63d1b5e | 7798 | case IORING_OP_FALLOCATE: |
bfe76559 | 7799 | return io_fallocate_prep(req, sqe); |
15b71abe | 7800 | case IORING_OP_OPENAT: |
bfe76559 | 7801 | return io_openat_prep(req, sqe); |
b5dba59e | 7802 | case IORING_OP_CLOSE: |
bfe76559 | 7803 | return io_close_prep(req, sqe); |
05f3fb3c | 7804 | case IORING_OP_FILES_UPDATE: |
269bbe5f | 7805 | return io_rsrc_update_prep(req, sqe); |
eddc7ef5 | 7806 | case IORING_OP_STATX: |
bfe76559 | 7807 | return io_statx_prep(req, sqe); |
4840e418 | 7808 | case IORING_OP_FADVISE: |
bfe76559 | 7809 | return io_fadvise_prep(req, sqe); |
c1ca757b | 7810 | case IORING_OP_MADVISE: |
bfe76559 | 7811 | return io_madvise_prep(req, sqe); |
cebdb986 | 7812 | case IORING_OP_OPENAT2: |
bfe76559 | 7813 | return io_openat2_prep(req, sqe); |
3e4827b0 | 7814 | case IORING_OP_EPOLL_CTL: |
bfe76559 | 7815 | return io_epoll_ctl_prep(req, sqe); |
7d67af2c | 7816 | case IORING_OP_SPLICE: |
bfe76559 | 7817 | return io_splice_prep(req, sqe); |
ddf0322d | 7818 | case IORING_OP_PROVIDE_BUFFERS: |
bfe76559 | 7819 | return io_provide_buffers_prep(req, sqe); |
067524e9 | 7820 | case IORING_OP_REMOVE_BUFFERS: |
bfe76559 | 7821 | return io_remove_buffers_prep(req, sqe); |
f2a8d5c7 | 7822 | case IORING_OP_TEE: |
bfe76559 | 7823 | return io_tee_prep(req, sqe); |
36f4fa68 JA |
7824 | case IORING_OP_SHUTDOWN: |
7825 | return io_shutdown_prep(req, sqe); | |
80a261fd JA |
7826 | case IORING_OP_RENAMEAT: |
7827 | return io_renameat_prep(req, sqe); | |
14a1143b JA |
7828 | case IORING_OP_UNLINKAT: |
7829 | return io_unlinkat_prep(req, sqe); | |
e34a02dc DK |
7830 | case IORING_OP_MKDIRAT: |
7831 | return io_mkdirat_prep(req, sqe); | |
7a8721f8 DK |
7832 | case IORING_OP_SYMLINKAT: |
7833 | return io_symlinkat_prep(req, sqe); | |
cf30da90 DK |
7834 | case IORING_OP_LINKAT: |
7835 | return io_linkat_prep(req, sqe); | |
4f57f06c JA |
7836 | case IORING_OP_MSG_RING: |
7837 | return io_msg_ring_prep(req, sqe); | |
e9621e2b SR |
7838 | case IORING_OP_FSETXATTR: |
7839 | return io_fsetxattr_prep(req, sqe); | |
7840 | case IORING_OP_SETXATTR: | |
7841 | return io_setxattr_prep(req, sqe); | |
a56834e0 SR |
7842 | case IORING_OP_FGETXATTR: |
7843 | return io_fgetxattr_prep(req, sqe); | |
7844 | case IORING_OP_GETXATTR: | |
7845 | return io_getxattr_prep(req, sqe); | |
1374e08e JA |
7846 | case IORING_OP_SOCKET: |
7847 | return io_socket_prep(req, sqe); | |
ee692a21 JA |
7848 | case IORING_OP_URING_CMD: |
7849 | return io_uring_cmd_prep(req, sqe); | |
f67676d1 JA |
7850 | } |
7851 | ||
bfe76559 PB |
7852 | printk_once(KERN_WARNING "io_uring: unhandled opcode %d\n", |
7853 | req->opcode); | |
bd54b6fe | 7854 | return -EINVAL; |
bfe76559 PB |
7855 | } |
7856 | ||
93642ef8 | 7857 | static int io_req_prep_async(struct io_kiocb *req) |
bfe76559 | 7858 | { |
a196c78b JA |
7859 | const struct io_op_def *def = &io_op_defs[req->opcode]; |
7860 | ||
7861 | /* assign early for deferred execution for non-fixed file */ | |
7862 | if (def->needs_file && !(req->flags & REQ_F_FIXED_FILE)) | |
13086899 | 7863 | req->file = io_file_get_normal(req, req->cqe.fd); |
a196c78b | 7864 | if (!def->needs_async_setup) |
b7e298d2 | 7865 | return 0; |
d886e185 | 7866 | if (WARN_ON_ONCE(req_has_async_data(req))) |
b7e298d2 PB |
7867 | return -EFAULT; |
7868 | if (io_alloc_async_data(req)) | |
7869 | return -EAGAIN; | |
7870 | ||
93642ef8 PB |
7871 | switch (req->opcode) { |
7872 | case IORING_OP_READV: | |
93642ef8 PB |
7873 | return io_rw_prep_async(req, READ); |
7874 | case IORING_OP_WRITEV: | |
93642ef8 PB |
7875 | return io_rw_prep_async(req, WRITE); |
7876 | case IORING_OP_SENDMSG: | |
93642ef8 PB |
7877 | return io_sendmsg_prep_async(req); |
7878 | case IORING_OP_RECVMSG: | |
93642ef8 PB |
7879 | return io_recvmsg_prep_async(req); |
7880 | case IORING_OP_CONNECT: | |
7881 | return io_connect_prep_async(req); | |
ee692a21 JA |
7882 | case IORING_OP_URING_CMD: |
7883 | return io_uring_cmd_prep_async(req); | |
93642ef8 | 7884 | } |
b7e298d2 PB |
7885 | printk_once(KERN_WARNING "io_uring: prep_async() bad opcode %d\n", |
7886 | req->opcode); | |
7887 | return -EFAULT; | |
f67676d1 JA |
7888 | } |
7889 | ||
9cf7c104 PB |
7890 | static u32 io_get_sequence(struct io_kiocb *req) |
7891 | { | |
a3dbdf54 | 7892 | u32 seq = req->ctx->cached_sq_head; |
963c6abb | 7893 | struct io_kiocb *cur; |
9cf7c104 | 7894 | |
a3dbdf54 | 7895 | /* need original cached_sq_head, but it was increased for each req */ |
963c6abb | 7896 | io_for_each_link(cur, req) |
a3dbdf54 PB |
7897 | seq--; |
7898 | return seq; | |
9cf7c104 PB |
7899 | } |
7900 | ||
c072481d | 7901 | static __cold void io_drain_req(struct io_kiocb *req) |
de0617e4 | 7902 | { |
a197f664 | 7903 | struct io_ring_ctx *ctx = req->ctx; |
27dc8338 | 7904 | struct io_defer_entry *de; |
f67676d1 | 7905 | int ret; |
e0eb71dc | 7906 | u32 seq = io_get_sequence(req); |
3c19966d | 7907 | |
9d858b21 | 7908 | /* Still need defer if there is pending req in defer list. */ |
e302f104 | 7909 | spin_lock(&ctx->completion_lock); |
5e371265 | 7910 | if (!req_need_defer(req, seq) && list_empty_careful(&ctx->defer_list)) { |
e302f104 | 7911 | spin_unlock(&ctx->completion_lock); |
e0eb71dc | 7912 | queue: |
10c66904 | 7913 | ctx->drain_active = false; |
e0eb71dc PB |
7914 | io_req_task_queue(req); |
7915 | return; | |
10c66904 | 7916 | } |
e302f104 | 7917 | spin_unlock(&ctx->completion_lock); |
9cf7c104 | 7918 | |
b7e298d2 | 7919 | ret = io_req_prep_async(req); |
e0eb71dc PB |
7920 | if (ret) { |
7921 | fail: | |
7922 | io_req_complete_failed(req, ret); | |
7923 | return; | |
7924 | } | |
cbdcb435 | 7925 | io_prep_async_link(req); |
27dc8338 | 7926 | de = kmalloc(sizeof(*de), GFP_KERNEL); |
76cc33d7 | 7927 | if (!de) { |
1b48773f | 7928 | ret = -ENOMEM; |
e0eb71dc | 7929 | goto fail; |
76cc33d7 | 7930 | } |
2d28390a | 7931 | |
79ebeaee | 7932 | spin_lock(&ctx->completion_lock); |
9cf7c104 | 7933 | if (!req_need_defer(req, seq) && list_empty(&ctx->defer_list)) { |
79ebeaee | 7934 | spin_unlock(&ctx->completion_lock); |
27dc8338 | 7935 | kfree(de); |
e0eb71dc | 7936 | goto queue; |
de0617e4 JA |
7937 | } |
7938 | ||
cef216fc | 7939 | trace_io_uring_defer(ctx, req, req->cqe.user_data, req->opcode); |
27dc8338 | 7940 | de->req = req; |
9cf7c104 | 7941 | de->seq = seq; |
27dc8338 | 7942 | list_add_tail(&de->list, &ctx->defer_list); |
79ebeaee | 7943 | spin_unlock(&ctx->completion_lock); |
de0617e4 JA |
7944 | } |
7945 | ||
68fb8979 | 7946 | static void io_clean_op(struct io_kiocb *req) |
99bc4c38 | 7947 | { |
8197b053 PB |
7948 | if (req->flags & REQ_F_BUFFER_SELECTED) { |
7949 | spin_lock(&req->ctx->completion_lock); | |
cc3cec83 | 7950 | io_put_kbuf_comp(req); |
8197b053 PB |
7951 | spin_unlock(&req->ctx->completion_lock); |
7952 | } | |
99bc4c38 | 7953 | |
0e1b6fe3 PB |
7954 | if (req->flags & REQ_F_NEED_CLEANUP) { |
7955 | switch (req->opcode) { | |
7956 | case IORING_OP_READV: | |
7957 | case IORING_OP_READ_FIXED: | |
7958 | case IORING_OP_READ: | |
7959 | case IORING_OP_WRITEV: | |
7960 | case IORING_OP_WRITE_FIXED: | |
e8c2bc1f JA |
7961 | case IORING_OP_WRITE: { |
7962 | struct io_async_rw *io = req->async_data; | |
1dacb4df PB |
7963 | |
7964 | kfree(io->free_iovec); | |
0e1b6fe3 | 7965 | break; |
e8c2bc1f | 7966 | } |
0e1b6fe3 | 7967 | case IORING_OP_RECVMSG: |
e8c2bc1f JA |
7968 | case IORING_OP_SENDMSG: { |
7969 | struct io_async_msghdr *io = req->async_data; | |
257e84a5 PB |
7970 | |
7971 | kfree(io->free_iov); | |
0e1b6fe3 | 7972 | break; |
e8c2bc1f | 7973 | } |
f3cd4850 JA |
7974 | case IORING_OP_OPENAT: |
7975 | case IORING_OP_OPENAT2: | |
7976 | if (req->open.filename) | |
7977 | putname(req->open.filename); | |
7978 | break; | |
80a261fd JA |
7979 | case IORING_OP_RENAMEAT: |
7980 | putname(req->rename.oldpath); | |
7981 | putname(req->rename.newpath); | |
7982 | break; | |
14a1143b JA |
7983 | case IORING_OP_UNLINKAT: |
7984 | putname(req->unlink.filename); | |
7985 | break; | |
e34a02dc DK |
7986 | case IORING_OP_MKDIRAT: |
7987 | putname(req->mkdir.filename); | |
7988 | break; | |
7a8721f8 DK |
7989 | case IORING_OP_SYMLINKAT: |
7990 | putname(req->symlink.oldpath); | |
7991 | putname(req->symlink.newpath); | |
7992 | break; | |
cf30da90 DK |
7993 | case IORING_OP_LINKAT: |
7994 | putname(req->hardlink.oldpath); | |
7995 | putname(req->hardlink.newpath); | |
7996 | break; | |
1b6fe6e0 SR |
7997 | case IORING_OP_STATX: |
7998 | if (req->statx.filename) | |
7999 | putname(req->statx.filename); | |
8000 | break; | |
e9621e2b SR |
8001 | case IORING_OP_SETXATTR: |
8002 | case IORING_OP_FSETXATTR: | |
a56834e0 SR |
8003 | case IORING_OP_GETXATTR: |
8004 | case IORING_OP_FGETXATTR: | |
e9621e2b SR |
8005 | __io_xattr_finish(req); |
8006 | break; | |
0e1b6fe3 | 8007 | } |
99bc4c38 | 8008 | } |
75652a30 JA |
8009 | if ((req->flags & REQ_F_POLLED) && req->apoll) { |
8010 | kfree(req->apoll->double_poll); | |
8011 | kfree(req->apoll); | |
8012 | req->apoll = NULL; | |
8013 | } | |
c854357b | 8014 | if (req->flags & REQ_F_CREDS) |
b8e64b53 | 8015 | put_cred(req->creds); |
d886e185 PB |
8016 | if (req->flags & REQ_F_ASYNC_DATA) { |
8017 | kfree(req->async_data); | |
8018 | req->async_data = NULL; | |
8019 | } | |
c854357b | 8020 | req->flags &= ~IO_REQ_CLEAN_FLAGS; |
99bc4c38 PB |
8021 | } |
8022 | ||
6bf9c47a JA |
8023 | static bool io_assign_file(struct io_kiocb *req, unsigned int issue_flags) |
8024 | { | |
8025 | if (req->file || !io_op_defs[req->opcode].needs_file) | |
8026 | return true; | |
8027 | ||
8028 | if (req->flags & REQ_F_FIXED_FILE) | |
cef216fc | 8029 | req->file = io_file_get_fixed(req, req->cqe.fd, issue_flags); |
6bf9c47a | 8030 | else |
cef216fc | 8031 | req->file = io_file_get_normal(req, req->cqe.fd); |
6bf9c47a | 8032 | |
772f5e00 | 8033 | return !!req->file; |
6bf9c47a JA |
8034 | } |
8035 | ||
889fca73 | 8036 | static int io_issue_sqe(struct io_kiocb *req, unsigned int issue_flags) |
2b188cc1 | 8037 | { |
5730b27e | 8038 | const struct cred *creds = NULL; |
d625c6ee | 8039 | int ret; |
2b188cc1 | 8040 | |
70152140 JA |
8041 | if (unlikely(!io_assign_file(req, issue_flags))) |
8042 | return -EBADF; | |
8043 | ||
6878b40e | 8044 | if (unlikely((req->flags & REQ_F_CREDS) && req->creds != current_cred())) |
c10d1f98 | 8045 | creds = override_creds(req->creds); |
5730b27e | 8046 | |
5bd2182d PM |
8047 | if (!io_op_defs[req->opcode].audit_skip) |
8048 | audit_uring_entry(req->opcode); | |
8049 | ||
d625c6ee | 8050 | switch (req->opcode) { |
2b188cc1 | 8051 | case IORING_OP_NOP: |
889fca73 | 8052 | ret = io_nop(req, issue_flags); |
2b188cc1 JA |
8053 | break; |
8054 | case IORING_OP_READV: | |
edafccee | 8055 | case IORING_OP_READ_FIXED: |
3a6820f2 | 8056 | case IORING_OP_READ: |
889fca73 | 8057 | ret = io_read(req, issue_flags); |
edafccee | 8058 | break; |
3529d8c2 | 8059 | case IORING_OP_WRITEV: |
edafccee | 8060 | case IORING_OP_WRITE_FIXED: |
3a6820f2 | 8061 | case IORING_OP_WRITE: |
889fca73 | 8062 | ret = io_write(req, issue_flags); |
2b188cc1 | 8063 | break; |
c992fe29 | 8064 | case IORING_OP_FSYNC: |
45d189c6 | 8065 | ret = io_fsync(req, issue_flags); |
c992fe29 | 8066 | break; |
221c5eb2 | 8067 | case IORING_OP_POLL_ADD: |
61e98203 | 8068 | ret = io_poll_add(req, issue_flags); |
221c5eb2 JA |
8069 | break; |
8070 | case IORING_OP_POLL_REMOVE: | |
c5de0036 | 8071 | ret = io_poll_update(req, issue_flags); |
221c5eb2 | 8072 | break; |
5d17b4a4 | 8073 | case IORING_OP_SYNC_FILE_RANGE: |
45d189c6 | 8074 | ret = io_sync_file_range(req, issue_flags); |
5d17b4a4 | 8075 | break; |
0fa03c62 | 8076 | case IORING_OP_SENDMSG: |
889fca73 | 8077 | ret = io_sendmsg(req, issue_flags); |
062d04d7 | 8078 | break; |
fddaface | 8079 | case IORING_OP_SEND: |
889fca73 | 8080 | ret = io_send(req, issue_flags); |
0fa03c62 | 8081 | break; |
aa1fa28f | 8082 | case IORING_OP_RECVMSG: |
889fca73 | 8083 | ret = io_recvmsg(req, issue_flags); |
062d04d7 | 8084 | break; |
fddaface | 8085 | case IORING_OP_RECV: |
889fca73 | 8086 | ret = io_recv(req, issue_flags); |
aa1fa28f | 8087 | break; |
5262f567 | 8088 | case IORING_OP_TIMEOUT: |
61e98203 | 8089 | ret = io_timeout(req, issue_flags); |
5262f567 | 8090 | break; |
11365043 | 8091 | case IORING_OP_TIMEOUT_REMOVE: |
61e98203 | 8092 | ret = io_timeout_remove(req, issue_flags); |
11365043 | 8093 | break; |
17f2fe35 | 8094 | case IORING_OP_ACCEPT: |
889fca73 | 8095 | ret = io_accept(req, issue_flags); |
17f2fe35 | 8096 | break; |
f8e85cf2 | 8097 | case IORING_OP_CONNECT: |
889fca73 | 8098 | ret = io_connect(req, issue_flags); |
f8e85cf2 | 8099 | break; |
62755e35 | 8100 | case IORING_OP_ASYNC_CANCEL: |
61e98203 | 8101 | ret = io_async_cancel(req, issue_flags); |
62755e35 | 8102 | break; |
d63d1b5e | 8103 | case IORING_OP_FALLOCATE: |
45d189c6 | 8104 | ret = io_fallocate(req, issue_flags); |
d63d1b5e | 8105 | break; |
15b71abe | 8106 | case IORING_OP_OPENAT: |
45d189c6 | 8107 | ret = io_openat(req, issue_flags); |
15b71abe | 8108 | break; |
b5dba59e | 8109 | case IORING_OP_CLOSE: |
889fca73 | 8110 | ret = io_close(req, issue_flags); |
b5dba59e | 8111 | break; |
05f3fb3c | 8112 | case IORING_OP_FILES_UPDATE: |
889fca73 | 8113 | ret = io_files_update(req, issue_flags); |
05f3fb3c | 8114 | break; |
eddc7ef5 | 8115 | case IORING_OP_STATX: |
45d189c6 | 8116 | ret = io_statx(req, issue_flags); |
eddc7ef5 | 8117 | break; |
4840e418 | 8118 | case IORING_OP_FADVISE: |
45d189c6 | 8119 | ret = io_fadvise(req, issue_flags); |
4840e418 | 8120 | break; |
c1ca757b | 8121 | case IORING_OP_MADVISE: |
45d189c6 | 8122 | ret = io_madvise(req, issue_flags); |
c1ca757b | 8123 | break; |
cebdb986 | 8124 | case IORING_OP_OPENAT2: |
45d189c6 | 8125 | ret = io_openat2(req, issue_flags); |
cebdb986 | 8126 | break; |
3e4827b0 | 8127 | case IORING_OP_EPOLL_CTL: |
889fca73 | 8128 | ret = io_epoll_ctl(req, issue_flags); |
3e4827b0 | 8129 | break; |
7d67af2c | 8130 | case IORING_OP_SPLICE: |
45d189c6 | 8131 | ret = io_splice(req, issue_flags); |
7d67af2c | 8132 | break; |
ddf0322d | 8133 | case IORING_OP_PROVIDE_BUFFERS: |
889fca73 | 8134 | ret = io_provide_buffers(req, issue_flags); |
ddf0322d | 8135 | break; |
067524e9 | 8136 | case IORING_OP_REMOVE_BUFFERS: |
889fca73 | 8137 | ret = io_remove_buffers(req, issue_flags); |
3e4827b0 | 8138 | break; |
f2a8d5c7 | 8139 | case IORING_OP_TEE: |
45d189c6 | 8140 | ret = io_tee(req, issue_flags); |
f2a8d5c7 | 8141 | break; |
36f4fa68 | 8142 | case IORING_OP_SHUTDOWN: |
45d189c6 | 8143 | ret = io_shutdown(req, issue_flags); |
36f4fa68 | 8144 | break; |
80a261fd | 8145 | case IORING_OP_RENAMEAT: |
45d189c6 | 8146 | ret = io_renameat(req, issue_flags); |
80a261fd | 8147 | break; |
14a1143b | 8148 | case IORING_OP_UNLINKAT: |
45d189c6 | 8149 | ret = io_unlinkat(req, issue_flags); |
14a1143b | 8150 | break; |
e34a02dc DK |
8151 | case IORING_OP_MKDIRAT: |
8152 | ret = io_mkdirat(req, issue_flags); | |
8153 | break; | |
7a8721f8 DK |
8154 | case IORING_OP_SYMLINKAT: |
8155 | ret = io_symlinkat(req, issue_flags); | |
8156 | break; | |
cf30da90 DK |
8157 | case IORING_OP_LINKAT: |
8158 | ret = io_linkat(req, issue_flags); | |
8159 | break; | |
4f57f06c JA |
8160 | case IORING_OP_MSG_RING: |
8161 | ret = io_msg_ring(req, issue_flags); | |
8162 | break; | |
e9621e2b SR |
8163 | case IORING_OP_FSETXATTR: |
8164 | ret = io_fsetxattr(req, issue_flags); | |
8165 | break; | |
8166 | case IORING_OP_SETXATTR: | |
8167 | ret = io_setxattr(req, issue_flags); | |
8168 | break; | |
a56834e0 SR |
8169 | case IORING_OP_FGETXATTR: |
8170 | ret = io_fgetxattr(req, issue_flags); | |
8171 | break; | |
8172 | case IORING_OP_GETXATTR: | |
8173 | ret = io_getxattr(req, issue_flags); | |
8174 | break; | |
1374e08e JA |
8175 | case IORING_OP_SOCKET: |
8176 | ret = io_socket(req, issue_flags); | |
8177 | break; | |
ee692a21 JA |
8178 | case IORING_OP_URING_CMD: |
8179 | ret = io_uring_cmd(req, issue_flags); | |
8180 | break; | |
2b188cc1 JA |
8181 | default: |
8182 | ret = -EINVAL; | |
8183 | break; | |
8184 | } | |
8185 | ||
5bd2182d PM |
8186 | if (!io_op_defs[req->opcode].audit_skip) |
8187 | audit_uring_exit(!ret, ret); | |
8188 | ||
5730b27e JA |
8189 | if (creds) |
8190 | revert_creds(creds); | |
def596e9 JA |
8191 | if (ret) |
8192 | return ret; | |
b532576e | 8193 | /* If the op doesn't have a file, we're not polling for it */ |
9983028e | 8194 | if ((req->ctx->flags & IORING_SETUP_IOPOLL) && req->file) |
9882131c | 8195 | io_iopoll_req_issued(req, issue_flags); |
def596e9 JA |
8196 | |
8197 | return 0; | |
2b188cc1 JA |
8198 | } |
8199 | ||
ebc11b6c PB |
8200 | static struct io_wq_work *io_wq_free_work(struct io_wq_work *work) |
8201 | { | |
8202 | struct io_kiocb *req = container_of(work, struct io_kiocb, work); | |
8203 | ||
8204 | req = io_put_req_find_next(req); | |
8205 | return req ? &req->work : NULL; | |
8206 | } | |
8207 | ||
5280f7e5 | 8208 | static void io_wq_submit_work(struct io_wq_work *work) |
2b188cc1 JA |
8209 | { |
8210 | struct io_kiocb *req = container_of(work, struct io_kiocb, work); | |
6bf9c47a | 8211 | const struct io_op_def *def = &io_op_defs[req->opcode]; |
d01905db PB |
8212 | unsigned int issue_flags = IO_URING_F_UNLOCKED; |
8213 | bool needs_poll = false; | |
6bf9c47a | 8214 | int ret = 0, err = -ECANCELED; |
2b188cc1 | 8215 | |
48dcd38d PB |
8216 | /* one will be dropped by ->io_free_work() after returning to io-wq */ |
8217 | if (!(req->flags & REQ_F_REFCOUNT)) | |
8218 | __io_req_set_refcount(req, 2); | |
8219 | else | |
8220 | req_ref_get(req); | |
5d5901a3 | 8221 | |
cb2d344c | 8222 | io_arm_ltimeout(req); |
6bf9c47a | 8223 | |
dadebc35 | 8224 | /* either cancelled or io-wq is dying, so don't touch tctx->iowq */ |
d01905db | 8225 | if (work->flags & IO_WQ_WORK_CANCEL) { |
0f8da75b | 8226 | fail: |
6bf9c47a | 8227 | io_req_task_queue_fail(req, err); |
d01905db PB |
8228 | return; |
8229 | } | |
0f8da75b PB |
8230 | if (!io_assign_file(req, issue_flags)) { |
8231 | err = -EBADF; | |
8232 | work->flags |= IO_WQ_WORK_CANCEL; | |
8233 | goto fail; | |
8234 | } | |
31b51510 | 8235 | |
d01905db | 8236 | if (req->flags & REQ_F_FORCE_ASYNC) { |
afb7f56f PB |
8237 | bool opcode_poll = def->pollin || def->pollout; |
8238 | ||
8239 | if (opcode_poll && file_can_poll(req->file)) { | |
8240 | needs_poll = true; | |
d01905db | 8241 | issue_flags |= IO_URING_F_NONBLOCK; |
afb7f56f | 8242 | } |
561fb04a | 8243 | } |
31b51510 | 8244 | |
d01905db PB |
8245 | do { |
8246 | ret = io_issue_sqe(req, issue_flags); | |
8247 | if (ret != -EAGAIN) | |
8248 | break; | |
8249 | /* | |
8250 | * We can get EAGAIN for iopolled IO even though we're | |
8251 | * forcing a sync submission from here, since we can't | |
8252 | * wait for request slots on the block side. | |
8253 | */ | |
8254 | if (!needs_poll) { | |
8255 | cond_resched(); | |
8256 | continue; | |
90fa0288 HX |
8257 | } |
8258 | ||
4d9237e3 | 8259 | if (io_arm_poll_handler(req, issue_flags) == IO_APOLL_OK) |
d01905db PB |
8260 | return; |
8261 | /* aborted or ready, in either case retry blocking */ | |
8262 | needs_poll = false; | |
8263 | issue_flags &= ~IO_URING_F_NONBLOCK; | |
8264 | } while (1); | |
31b51510 | 8265 | |
a3df7698 | 8266 | /* avoid locking problems by failing it from a clean context */ |
5d5901a3 | 8267 | if (ret) |
a3df7698 | 8268 | io_req_task_queue_fail(req, ret); |
2b188cc1 JA |
8269 | } |
8270 | ||
aeca241b | 8271 | static inline struct io_fixed_file *io_fixed_file_slot(struct io_file_table *table, |
042b0d85 | 8272 | unsigned i) |
65e19f54 | 8273 | { |
042b0d85 | 8274 | return &table->files[i]; |
dafecf19 PB |
8275 | } |
8276 | ||
65e19f54 JA |
8277 | static inline struct file *io_file_from_index(struct io_ring_ctx *ctx, |
8278 | int index) | |
8279 | { | |
aeca241b | 8280 | struct io_fixed_file *slot = io_fixed_file_slot(&ctx->file_table, index); |
65e19f54 | 8281 | |
a04b0ac0 | 8282 | return (struct file *) (slot->file_ptr & FFS_MASK); |
65e19f54 JA |
8283 | } |
8284 | ||
a04b0ac0 | 8285 | static void io_fixed_file_set(struct io_fixed_file *file_slot, struct file *file) |
9a321c98 PB |
8286 | { |
8287 | unsigned long file_ptr = (unsigned long) file; | |
8288 | ||
88459b50 | 8289 | file_ptr |= io_file_get_flags(file); |
a04b0ac0 | 8290 | file_slot->file_ptr = file_ptr; |
65e19f54 JA |
8291 | } |
8292 | ||
5106dd6e JA |
8293 | static inline struct file *io_file_get_fixed(struct io_kiocb *req, int fd, |
8294 | unsigned int issue_flags) | |
09bb8394 | 8295 | { |
5106dd6e JA |
8296 | struct io_ring_ctx *ctx = req->ctx; |
8297 | struct file *file = NULL; | |
ac177053 | 8298 | unsigned long file_ptr; |
09bb8394 | 8299 | |
93f052cb | 8300 | io_ring_submit_lock(ctx, issue_flags); |
5106dd6e | 8301 | |
ac177053 | 8302 | if (unlikely((unsigned int)fd >= ctx->nr_user_files)) |
5106dd6e | 8303 | goto out; |
ac177053 PB |
8304 | fd = array_index_nospec(fd, ctx->nr_user_files); |
8305 | file_ptr = io_fixed_file_slot(&ctx->file_table, fd)->file_ptr; | |
8306 | file = (struct file *) (file_ptr & FFS_MASK); | |
8307 | file_ptr &= ~FFS_MASK; | |
8308 | /* mask in overlapping REQ_F and FFS bits */ | |
35645ac3 | 8309 | req->flags |= (file_ptr << REQ_F_SUPPORT_NOWAIT_BIT); |
5106dd6e JA |
8310 | io_req_set_rsrc_node(req, ctx, 0); |
8311 | out: | |
93f052cb | 8312 | io_ring_submit_unlock(ctx, issue_flags); |
ac177053 PB |
8313 | return file; |
8314 | } | |
d44f554e | 8315 | |
d5361233 JA |
8316 | /* |
8317 | * Drop the file for requeue operations. Only used of req->file is the | |
8318 | * io_uring descriptor itself. | |
8319 | */ | |
8320 | static void io_drop_inflight_file(struct io_kiocb *req) | |
8321 | { | |
8322 | if (unlikely(req->flags & REQ_F_INFLIGHT)) { | |
8323 | fput(req->file); | |
8324 | req->file = NULL; | |
8325 | req->flags &= ~REQ_F_INFLIGHT; | |
8326 | } | |
8327 | } | |
8328 | ||
5106dd6e | 8329 | static struct file *io_file_get_normal(struct io_kiocb *req, int fd) |
ac177053 | 8330 | { |
62906e89 | 8331 | struct file *file = fget(fd); |
ac177053 | 8332 | |
cef216fc | 8333 | trace_io_uring_file_get(req->ctx, req, req->cqe.user_data, fd); |
09bb8394 | 8334 | |
ac177053 | 8335 | /* we don't allow fixed io_uring files */ |
d5361233 JA |
8336 | if (file && file->f_op == &io_uring_fops) |
8337 | req->flags |= REQ_F_INFLIGHT; | |
8371adf5 | 8338 | return file; |
09bb8394 JA |
8339 | } |
8340 | ||
f237c30a | 8341 | static void io_req_task_link_timeout(struct io_kiocb *req, bool *locked) |
89b263f6 JA |
8342 | { |
8343 | struct io_kiocb *prev = req->timeout.prev; | |
617a8948 | 8344 | int ret = -ENOENT; |
89b263f6 JA |
8345 | |
8346 | if (prev) { | |
b21432b4 JA |
8347 | if (!(req->task->flags & PF_EXITING)) { |
8348 | struct io_cancel_data cd = { | |
8349 | .ctx = req->ctx, | |
8350 | .data = prev->cqe.user_data, | |
8351 | }; | |
8352 | ||
8353 | ret = io_try_cancel(req, &cd); | |
8354 | } | |
505657bc | 8355 | io_req_complete_post(req, ret ?: -ETIME, 0); |
89b263f6 | 8356 | io_put_req(prev); |
89b263f6 JA |
8357 | } else { |
8358 | io_req_complete_post(req, -ETIME, 0); | |
8359 | } | |
8360 | } | |
8361 | ||
2665abfd | 8362 | static enum hrtimer_restart io_link_timeout_fn(struct hrtimer *timer) |
2b188cc1 | 8363 | { |
ad8a48ac JA |
8364 | struct io_timeout_data *data = container_of(timer, |
8365 | struct io_timeout_data, timer); | |
90cd7e42 | 8366 | struct io_kiocb *prev, *req = data->req; |
2665abfd | 8367 | struct io_ring_ctx *ctx = req->ctx; |
2665abfd | 8368 | unsigned long flags; |
2665abfd | 8369 | |
89b263f6 | 8370 | spin_lock_irqsave(&ctx->timeout_lock, flags); |
90cd7e42 PB |
8371 | prev = req->timeout.head; |
8372 | req->timeout.head = NULL; | |
2665abfd JA |
8373 | |
8374 | /* | |
8375 | * We don't expect the list to be empty, that will only happen if we | |
8376 | * race with the completion of the linked work. | |
8377 | */ | |
447c19f3 | 8378 | if (prev) { |
f2f87370 | 8379 | io_remove_next_linked(prev); |
447c19f3 PB |
8380 | if (!req_ref_inc_not_zero(prev)) |
8381 | prev = NULL; | |
8382 | } | |
ef9dd637 | 8383 | list_del(&req->timeout.list); |
89b263f6 JA |
8384 | req->timeout.prev = prev; |
8385 | spin_unlock_irqrestore(&ctx->timeout_lock, flags); | |
2665abfd | 8386 | |
89b263f6 | 8387 | req->io_task_work.func = io_req_task_link_timeout; |
4813c377 | 8388 | io_req_task_work_add(req, false); |
2665abfd JA |
8389 | return HRTIMER_NORESTART; |
8390 | } | |
8391 | ||
de968c18 | 8392 | static void io_queue_linked_timeout(struct io_kiocb *req) |
2665abfd | 8393 | { |
de968c18 PB |
8394 | struct io_ring_ctx *ctx = req->ctx; |
8395 | ||
89b263f6 | 8396 | spin_lock_irq(&ctx->timeout_lock); |
76a46e06 | 8397 | /* |
f2f87370 PB |
8398 | * If the back reference is NULL, then our linked request finished |
8399 | * before we got a chance to setup the timer | |
76a46e06 | 8400 | */ |
90cd7e42 | 8401 | if (req->timeout.head) { |
e8c2bc1f | 8402 | struct io_timeout_data *data = req->async_data; |
94ae5e77 | 8403 | |
ad8a48ac JA |
8404 | data->timer.function = io_link_timeout_fn; |
8405 | hrtimer_start(&data->timer, timespec64_to_ktime(data->ts), | |
8406 | data->mode); | |
ef9dd637 | 8407 | list_add_tail(&req->timeout.list, &ctx->ltimeout_list); |
2665abfd | 8408 | } |
89b263f6 | 8409 | spin_unlock_irq(&ctx->timeout_lock); |
2665abfd | 8410 | /* drop submission reference */ |
76a46e06 JA |
8411 | io_put_req(req); |
8412 | } | |
2665abfd | 8413 | |
7bfa9bad | 8414 | static void io_queue_async(struct io_kiocb *req, int ret) |
d475a9a6 PB |
8415 | __must_hold(&req->ctx->uring_lock) |
8416 | { | |
7bfa9bad PB |
8417 | struct io_kiocb *linked_timeout; |
8418 | ||
8419 | if (ret != -EAGAIN || (req->flags & REQ_F_NOWAIT)) { | |
8420 | io_req_complete_failed(req, ret); | |
8421 | return; | |
8422 | } | |
8423 | ||
8424 | linked_timeout = io_prep_linked_timeout(req); | |
d475a9a6 | 8425 | |
4d9237e3 | 8426 | switch (io_arm_poll_handler(req, 0)) { |
d475a9a6 | 8427 | case IO_APOLL_READY: |
d475a9a6 PB |
8428 | io_req_task_queue(req); |
8429 | break; | |
8430 | case IO_APOLL_ABORTED: | |
8431 | /* | |
8432 | * Queued up for async execution, worker will release | |
8433 | * submit reference when the iocb is actually submitted. | |
8434 | */ | |
77955efb | 8435 | io_queue_iowq(req, NULL); |
d475a9a6 | 8436 | break; |
b1c62645 | 8437 | case IO_APOLL_OK: |
b1c62645 | 8438 | break; |
d475a9a6 PB |
8439 | } |
8440 | ||
8441 | if (linked_timeout) | |
8442 | io_queue_linked_timeout(linked_timeout); | |
8443 | } | |
8444 | ||
cbc2e203 | 8445 | static inline void io_queue_sqe(struct io_kiocb *req) |
282cdc86 | 8446 | __must_hold(&req->ctx->uring_lock) |
2b188cc1 | 8447 | { |
e0c5c576 | 8448 | int ret; |
2b188cc1 | 8449 | |
c5eef2b9 | 8450 | ret = io_issue_sqe(req, IO_URING_F_NONBLOCK|IO_URING_F_COMPLETE_DEFER); |
193155c8 | 8451 | |
fff4e40e PB |
8452 | if (req->flags & REQ_F_COMPLETE_INLINE) { |
8453 | io_req_add_compl_list(req); | |
d9f9d284 | 8454 | return; |
fff4e40e | 8455 | } |
491381ce JA |
8456 | /* |
8457 | * We async punt it if the file wasn't marked NOWAIT, or if the file | |
8458 | * doesn't support non-blocking read/write attempts | |
8459 | */ | |
7bfa9bad | 8460 | if (likely(!ret)) |
cb2d344c | 8461 | io_arm_ltimeout(req); |
7bfa9bad PB |
8462 | else |
8463 | io_queue_async(req, ret); | |
2b188cc1 JA |
8464 | } |
8465 | ||
4652fe3f | 8466 | static void io_queue_sqe_fallback(struct io_kiocb *req) |
282cdc86 | 8467 | __must_hold(&req->ctx->uring_lock) |
4fe2c963 | 8468 | { |
17b147f6 PB |
8469 | if (unlikely(req->flags & REQ_F_FAIL)) { |
8470 | /* | |
8471 | * We don't submit, fail them all, for that replace hardlinks | |
8472 | * with normal links. Extra REQ_F_LINK is tolerated. | |
8473 | */ | |
8474 | req->flags &= ~REQ_F_HARDLINK; | |
8475 | req->flags |= REQ_F_LINK; | |
8476 | io_req_complete_failed(req, req->cqe.res); | |
e0eb71dc PB |
8477 | } else if (unlikely(req->ctx->drain_active)) { |
8478 | io_drain_req(req); | |
76cc33d7 PB |
8479 | } else { |
8480 | int ret = io_req_prep_async(req); | |
8481 | ||
8482 | if (unlikely(ret)) | |
8483 | io_req_complete_failed(req, ret); | |
8484 | else | |
77955efb | 8485 | io_queue_iowq(req, NULL); |
ce35a47a | 8486 | } |
4fe2c963 JL |
8487 | } |
8488 | ||
b16fed66 PB |
8489 | /* |
8490 | * Check SQE restrictions (opcode and flags). | |
8491 | * | |
8492 | * Returns 'true' if SQE is allowed, 'false' otherwise. | |
8493 | */ | |
8494 | static inline bool io_check_restriction(struct io_ring_ctx *ctx, | |
8495 | struct io_kiocb *req, | |
8496 | unsigned int sqe_flags) | |
4fe2c963 | 8497 | { |
b16fed66 PB |
8498 | if (!test_bit(req->opcode, ctx->restrictions.sqe_op)) |
8499 | return false; | |
8500 | ||
8501 | if ((sqe_flags & ctx->restrictions.sqe_flags_required) != | |
8502 | ctx->restrictions.sqe_flags_required) | |
8503 | return false; | |
8504 | ||
8505 | if (sqe_flags & ~(ctx->restrictions.sqe_flags_allowed | | |
8506 | ctx->restrictions.sqe_flags_required)) | |
8507 | return false; | |
8508 | ||
8509 | return true; | |
4fe2c963 JL |
8510 | } |
8511 | ||
22b2ca31 PB |
8512 | static void io_init_req_drain(struct io_kiocb *req) |
8513 | { | |
8514 | struct io_ring_ctx *ctx = req->ctx; | |
8515 | struct io_kiocb *head = ctx->submit_state.link.head; | |
8516 | ||
8517 | ctx->drain_active = true; | |
8518 | if (head) { | |
8519 | /* | |
8520 | * If we need to drain a request in the middle of a link, drain | |
8521 | * the head request and the next request/link after the current | |
8522 | * link. Considering sequential execution of links, | |
b6c7db32 | 8523 | * REQ_F_IO_DRAIN will be maintained for every request of our |
22b2ca31 PB |
8524 | * link. |
8525 | */ | |
b6c7db32 | 8526 | head->flags |= REQ_F_IO_DRAIN | REQ_F_FORCE_ASYNC; |
22b2ca31 PB |
8527 | ctx->drain_next = true; |
8528 | } | |
8529 | } | |
8530 | ||
b16fed66 PB |
8531 | static int io_init_req(struct io_ring_ctx *ctx, struct io_kiocb *req, |
8532 | const struct io_uring_sqe *sqe) | |
282cdc86 | 8533 | __must_hold(&ctx->uring_lock) |
b16fed66 | 8534 | { |
b16fed66 | 8535 | unsigned int sqe_flags; |
fc0ae024 | 8536 | int personality; |
4a04d1d1 | 8537 | u8 opcode; |
b16fed66 | 8538 | |
864ea921 | 8539 | /* req is partially pre-initialised, see io_preinit_req() */ |
4a04d1d1 | 8540 | req->opcode = opcode = READ_ONCE(sqe->opcode); |
b16fed66 PB |
8541 | /* same numerical values with corresponding REQ_F_*, safe to copy */ |
8542 | req->flags = sqe_flags = READ_ONCE(sqe->flags); | |
cef216fc | 8543 | req->cqe.user_data = READ_ONCE(sqe->user_data); |
b16fed66 | 8544 | req->file = NULL; |
c1bdf8ed | 8545 | req->rsrc_node = NULL; |
b16fed66 | 8546 | req->task = current; |
b16fed66 | 8547 | |
4a04d1d1 PB |
8548 | if (unlikely(opcode >= IORING_OP_LAST)) { |
8549 | req->opcode = 0; | |
b16fed66 | 8550 | return -EINVAL; |
4a04d1d1 | 8551 | } |
68fe256a PB |
8552 | if (unlikely(sqe_flags & ~SQE_COMMON_FLAGS)) { |
8553 | /* enforce forwards compatibility on users */ | |
8554 | if (sqe_flags & ~SQE_VALID_FLAGS) | |
8555 | return -EINVAL; | |
4e906702 JA |
8556 | if (sqe_flags & IOSQE_BUFFER_SELECT) { |
8557 | if (!io_op_defs[opcode].buffer_select) | |
8558 | return -EOPNOTSUPP; | |
8559 | req->buf_index = READ_ONCE(sqe->buf_group); | |
8560 | } | |
5562a8d7 PB |
8561 | if (sqe_flags & IOSQE_CQE_SKIP_SUCCESS) |
8562 | ctx->drain_disabled = true; | |
8563 | if (sqe_flags & IOSQE_IO_DRAIN) { | |
8564 | if (ctx->drain_disabled) | |
8565 | return -EOPNOTSUPP; | |
22b2ca31 | 8566 | io_init_req_drain(req); |
5562a8d7 | 8567 | } |
2a56a9bd PB |
8568 | } |
8569 | if (unlikely(ctx->restricted || ctx->drain_active || ctx->drain_next)) { | |
8570 | if (ctx->restricted && !io_check_restriction(ctx, req, sqe_flags)) | |
8571 | return -EACCES; | |
8572 | /* knock it to the slow queue path, will be drained there */ | |
8573 | if (ctx->drain_active) | |
8574 | req->flags |= REQ_F_FORCE_ASYNC; | |
8575 | /* if there is no link, we're at "next" request and need to drain */ | |
8576 | if (unlikely(ctx->drain_next) && !ctx->submit_state.link.head) { | |
8577 | ctx->drain_next = false; | |
8578 | ctx->drain_active = true; | |
b6c7db32 | 8579 | req->flags |= REQ_F_IO_DRAIN | REQ_F_FORCE_ASYNC; |
2a56a9bd | 8580 | } |
68fe256a | 8581 | } |
b16fed66 | 8582 | |
73911426 JA |
8583 | if (!io_op_defs[opcode].ioprio && sqe->ioprio) |
8584 | return -EINVAL; | |
8585 | if (!io_op_defs[opcode].iopoll && (ctx->flags & IORING_SETUP_IOPOLL)) | |
8586 | return -EINVAL; | |
8587 | ||
4a04d1d1 | 8588 | if (io_op_defs[opcode].needs_file) { |
6d63416d PB |
8589 | struct io_submit_state *state = &ctx->submit_state; |
8590 | ||
cef216fc | 8591 | req->cqe.fd = READ_ONCE(sqe->fd); |
6bf9c47a | 8592 | |
6d63416d PB |
8593 | /* |
8594 | * Plug now if we have more than 2 IO left after this, and the | |
8595 | * target is potentially a read/write to block based storage. | |
8596 | */ | |
4a04d1d1 | 8597 | if (state->need_plug && io_op_defs[opcode].plug) { |
6d63416d PB |
8598 | state->plug_started = true; |
8599 | state->need_plug = false; | |
5ca7a8b3 | 8600 | blk_start_plug_nr_ios(&state->plug, state->submit_nr); |
6d63416d | 8601 | } |
b16fed66 | 8602 | } |
863e0560 | 8603 | |
003e8dcc JA |
8604 | personality = READ_ONCE(sqe->personality); |
8605 | if (personality) { | |
cdab10bf LT |
8606 | int ret; |
8607 | ||
c10d1f98 PB |
8608 | req->creds = xa_load(&ctx->personalities, personality); |
8609 | if (!req->creds) | |
003e8dcc | 8610 | return -EINVAL; |
c10d1f98 | 8611 | get_cred(req->creds); |
cdc1404a PM |
8612 | ret = security_uring_override_creds(req->creds); |
8613 | if (ret) { | |
8614 | put_cred(req->creds); | |
8615 | return ret; | |
8616 | } | |
b8e64b53 | 8617 | req->flags |= REQ_F_CREDS; |
003e8dcc | 8618 | } |
b16fed66 | 8619 | |
fc0ae024 | 8620 | return io_req_prep(req, sqe); |
b16fed66 PB |
8621 | } |
8622 | ||
df3becde PB |
8623 | static __cold int io_submit_fail_init(const struct io_uring_sqe *sqe, |
8624 | struct io_kiocb *req, int ret) | |
8625 | { | |
8626 | struct io_ring_ctx *ctx = req->ctx; | |
8627 | struct io_submit_link *link = &ctx->submit_state.link; | |
8628 | struct io_kiocb *head = link->head; | |
8629 | ||
8630 | trace_io_uring_req_failed(sqe, ctx, req, ret); | |
8631 | ||
8632 | /* | |
8633 | * Avoid breaking links in the middle as it renders links with SQPOLL | |
8634 | * unusable. Instead of failing eagerly, continue assembling the link if | |
8635 | * applicable and mark the head with REQ_F_FAIL. The link flushing code | |
8636 | * should find the flag and handle the rest. | |
8637 | */ | |
8638 | req_fail_link_node(req, ret); | |
8639 | if (head && !(head->flags & REQ_F_FAIL)) | |
8640 | req_fail_link_node(head, -ECANCELED); | |
8641 | ||
8642 | if (!(req->flags & IO_REQ_LINK_FLAGS)) { | |
8643 | if (head) { | |
8644 | link->last->link = req; | |
8645 | link->head = NULL; | |
8646 | req = head; | |
8647 | } | |
8648 | io_queue_sqe_fallback(req); | |
8649 | return ret; | |
003e8dcc | 8650 | } |
b16fed66 | 8651 | |
df3becde PB |
8652 | if (head) |
8653 | link->last->link = req; | |
8654 | else | |
8655 | link->head = req; | |
8656 | link->last = req; | |
8657 | return 0; | |
b16fed66 PB |
8658 | } |
8659 | ||
df3becde | 8660 | static inline int io_submit_sqe(struct io_ring_ctx *ctx, struct io_kiocb *req, |
a1ab7b35 | 8661 | const struct io_uring_sqe *sqe) |
282cdc86 | 8662 | __must_hold(&ctx->uring_lock) |
9e645e11 | 8663 | { |
a1ab7b35 | 8664 | struct io_submit_link *link = &ctx->submit_state.link; |
ef4ff581 | 8665 | int ret; |
9e645e11 | 8666 | |
a6b8cadc | 8667 | ret = io_init_req(ctx, req, sqe); |
df3becde PB |
8668 | if (unlikely(ret)) |
8669 | return io_submit_fail_init(sqe, req, ret); | |
441b8a78 | 8670 | |
be7053b7 | 8671 | /* don't need @sqe from now on */ |
cef216fc | 8672 | trace_io_uring_submit_sqe(ctx, req, req->cqe.user_data, req->opcode, |
236daeae OL |
8673 | req->flags, true, |
8674 | ctx->flags & IORING_SETUP_SQPOLL); | |
a6b8cadc | 8675 | |
9e645e11 JA |
8676 | /* |
8677 | * If we already have a head request, queue this one for async | |
8678 | * submittal once the head completes. If we don't have a head but | |
8679 | * IOSQE_IO_LINK is set in the sqe, start a new head. This one will be | |
8680 | * submitted sync once the chain is complete. If none of those | |
8681 | * conditions are true (normal request), then just queue it. | |
8682 | */ | |
924a07e4 | 8683 | if (unlikely(link->head)) { |
df3becde PB |
8684 | ret = io_req_prep_async(req); |
8685 | if (unlikely(ret)) | |
8686 | return io_submit_fail_init(sqe, req, ret); | |
8687 | ||
8688 | trace_io_uring_link(ctx, req, link->head); | |
f2f87370 | 8689 | link->last->link = req; |
863e0560 | 8690 | link->last = req; |
32fe525b | 8691 | |
da1a08c5 | 8692 | if (req->flags & IO_REQ_LINK_FLAGS) |
f15a3431 | 8693 | return 0; |
df3becde PB |
8694 | /* last request of the link, flush it */ |
8695 | req = link->head; | |
f15a3431 | 8696 | link->head = NULL; |
924a07e4 PB |
8697 | if (req->flags & (REQ_F_FORCE_ASYNC | REQ_F_FAIL)) |
8698 | goto fallback; | |
8699 | ||
8700 | } else if (unlikely(req->flags & (IO_REQ_LINK_FLAGS | | |
8701 | REQ_F_FORCE_ASYNC | REQ_F_FAIL))) { | |
8702 | if (req->flags & IO_REQ_LINK_FLAGS) { | |
8703 | link->head = req; | |
8704 | link->last = req; | |
8705 | } else { | |
8706 | fallback: | |
8707 | io_queue_sqe_fallback(req); | |
8708 | } | |
f15a3431 | 8709 | return 0; |
9e645e11 | 8710 | } |
2e6e1fde | 8711 | |
f15a3431 | 8712 | io_queue_sqe(req); |
1d4240cc | 8713 | return 0; |
9e645e11 JA |
8714 | } |
8715 | ||
9a56a232 JA |
8716 | /* |
8717 | * Batched submission is done, ensure local IO is flushed out. | |
8718 | */ | |
553deffd | 8719 | static void io_submit_state_end(struct io_ring_ctx *ctx) |
9a56a232 | 8720 | { |
553deffd PB |
8721 | struct io_submit_state *state = &ctx->submit_state; |
8722 | ||
e126391c PB |
8723 | if (unlikely(state->link.head)) |
8724 | io_queue_sqe_fallback(state->link.head); | |
553deffd | 8725 | /* flush only after queuing links as they can generate completions */ |
c450178d | 8726 | io_submit_flush_completions(ctx); |
27926b68 JA |
8727 | if (state->plug_started) |
8728 | blk_finish_plug(&state->plug); | |
9a56a232 JA |
8729 | } |
8730 | ||
8731 | /* | |
8732 | * Start submission side cache. | |
8733 | */ | |
8734 | static void io_submit_state_start(struct io_submit_state *state, | |
ba88ff11 | 8735 | unsigned int max_ios) |
9a56a232 | 8736 | { |
27926b68 | 8737 | state->plug_started = false; |
4b628aeb | 8738 | state->need_plug = max_ios > 2; |
5ca7a8b3 | 8739 | state->submit_nr = max_ios; |
a1ab7b35 PB |
8740 | /* set only head, no need to init link_last in advance */ |
8741 | state->link.head = NULL; | |
9a56a232 JA |
8742 | } |
8743 | ||
2b188cc1 JA |
8744 | static void io_commit_sqring(struct io_ring_ctx *ctx) |
8745 | { | |
75b28aff | 8746 | struct io_rings *rings = ctx->rings; |
2b188cc1 | 8747 | |
caf582c6 PB |
8748 | /* |
8749 | * Ensure any loads from the SQEs are done at this point, | |
8750 | * since once we write the new head, the application could | |
8751 | * write new data to them. | |
8752 | */ | |
8753 | smp_store_release(&rings->sq.head, ctx->cached_sq_head); | |
2b188cc1 JA |
8754 | } |
8755 | ||
2b188cc1 | 8756 | /* |
dd9ae8a0 | 8757 | * Fetch an sqe, if one is available. Note this returns a pointer to memory |
2b188cc1 JA |
8758 | * that is mapped by userspace. This means that care needs to be taken to |
8759 | * ensure that reads are stable, as we cannot rely on userspace always | |
8760 | * being a good citizen. If members of the sqe are validated and then later | |
8761 | * used, it's important that those reads are done through READ_ONCE() to | |
8762 | * prevent a re-load down the line. | |
8763 | */ | |
709b302f | 8764 | static const struct io_uring_sqe *io_get_sqe(struct io_ring_ctx *ctx) |
2b188cc1 | 8765 | { |
ea5ab3b5 | 8766 | unsigned head, mask = ctx->sq_entries - 1; |
17d3aeb3 | 8767 | unsigned sq_idx = ctx->cached_sq_head++ & mask; |
2b188cc1 JA |
8768 | |
8769 | /* | |
8770 | * The cached sq head (or cq tail) serves two purposes: | |
8771 | * | |
8772 | * 1) allows us to batch the cost of updating the user visible | |
8773 | * head updates. | |
8774 | * 2) allows the kernel side to track the head on its own, even | |
8775 | * though the application is the one updating it. | |
8776 | */ | |
17d3aeb3 | 8777 | head = READ_ONCE(ctx->sq_array[sq_idx]); |
ebdeb7c0 JA |
8778 | if (likely(head < ctx->sq_entries)) { |
8779 | /* double index for 128-byte SQEs, twice as long */ | |
8780 | if (ctx->flags & IORING_SETUP_SQE128) | |
8781 | head <<= 1; | |
709b302f | 8782 | return &ctx->sq_sqes[head]; |
ebdeb7c0 | 8783 | } |
2b188cc1 JA |
8784 | |
8785 | /* drop invalid entries */ | |
15641e42 PB |
8786 | ctx->cq_extra--; |
8787 | WRITE_ONCE(ctx->rings->sq_dropped, | |
8788 | READ_ONCE(ctx->rings->sq_dropped) + 1); | |
709b302f PB |
8789 | return NULL; |
8790 | } | |
8791 | ||
0f212204 | 8792 | static int io_submit_sqes(struct io_ring_ctx *ctx, unsigned int nr) |
282cdc86 | 8793 | __must_hold(&ctx->uring_lock) |
6c271ce2 | 8794 | { |
69629809 | 8795 | unsigned int entries = io_sqring_entries(ctx); |
8e6971a8 PB |
8796 | unsigned int left; |
8797 | int ret; | |
6c271ce2 | 8798 | |
51d48dab | 8799 | if (unlikely(!entries)) |
69629809 | 8800 | return 0; |
ee7d46d9 | 8801 | /* make sure SQ entry isn't read before tail */ |
8e6971a8 PB |
8802 | ret = left = min3(nr, ctx->sq_entries, entries); |
8803 | io_get_task_refs(left); | |
8804 | io_submit_state_start(&ctx->submit_state, left); | |
6c271ce2 | 8805 | |
69629809 | 8806 | do { |
3529d8c2 | 8807 | const struct io_uring_sqe *sqe; |
196be95c | 8808 | struct io_kiocb *req; |
fb5ccc98 | 8809 | |
8e6971a8 | 8810 | if (unlikely(!io_alloc_req_refill(ctx))) |
fb5ccc98 | 8811 | break; |
a33ae9ce | 8812 | req = io_alloc_req(ctx); |
4fccfcbb PB |
8813 | sqe = io_get_sqe(ctx); |
8814 | if (unlikely(!sqe)) { | |
fa05457a | 8815 | io_req_add_to_cache(req, ctx); |
4fccfcbb PB |
8816 | break; |
8817 | } | |
6c271ce2 | 8818 | |
1cd15904 PB |
8819 | /* |
8820 | * Continue submitting even for sqe failure if the | |
8821 | * ring was setup with IORING_SETUP_SUBMIT_ALL | |
8822 | */ | |
8823 | if (unlikely(io_submit_sqe(ctx, req, sqe)) && | |
8824 | !(ctx->flags & IORING_SETUP_SUBMIT_ALL)) { | |
8825 | left--; | |
8826 | break; | |
bcbb7bf6 | 8827 | } |
1cd15904 | 8828 | } while (--left); |
9466f437 | 8829 | |
8e6971a8 PB |
8830 | if (unlikely(left)) { |
8831 | ret -= left; | |
8832 | /* try again if it submitted nothing and can't allocate a req */ | |
8833 | if (!ret && io_req_cache_empty(ctx)) | |
8834 | ret = -EAGAIN; | |
8835 | current->io_uring->cached_refs += left; | |
9466f437 | 8836 | } |
6c271ce2 | 8837 | |
553deffd | 8838 | io_submit_state_end(ctx); |
ae9428ca PB |
8839 | /* Commit SQ ring head once we've consumed and submitted all SQEs */ |
8840 | io_commit_sqring(ctx); | |
8e6971a8 | 8841 | return ret; |
6c271ce2 JA |
8842 | } |
8843 | ||
e4b6d902 PB |
8844 | static inline bool io_sqd_events_pending(struct io_sq_data *sqd) |
8845 | { | |
8846 | return READ_ONCE(sqd->state); | |
8847 | } | |
8848 | ||
08369246 | 8849 | static int __io_sq_thread(struct io_ring_ctx *ctx, bool cap_entries) |
6c271ce2 | 8850 | { |
c8d1ba58 | 8851 | unsigned int to_submit; |
bdcd3eab | 8852 | int ret = 0; |
6c271ce2 | 8853 | |
c8d1ba58 | 8854 | to_submit = io_sqring_entries(ctx); |
e95eee2d | 8855 | /* if we're handling multiple rings, cap submit size for fairness */ |
4ce8ad95 OL |
8856 | if (cap_entries && to_submit > IORING_SQPOLL_CAP_ENTRIES_VALUE) |
8857 | to_submit = IORING_SQPOLL_CAP_ENTRIES_VALUE; | |
e95eee2d | 8858 | |
5eef4e87 | 8859 | if (!wq_list_empty(&ctx->iopoll_list) || to_submit) { |
948e1947 PB |
8860 | const struct cred *creds = NULL; |
8861 | ||
8862 | if (ctx->sq_creds != current_cred()) | |
8863 | creds = override_creds(ctx->sq_creds); | |
a4c0b3de | 8864 | |
c8d1ba58 | 8865 | mutex_lock(&ctx->uring_lock); |
5eef4e87 | 8866 | if (!wq_list_empty(&ctx->iopoll_list)) |
5ba3c874 | 8867 | io_do_iopoll(ctx, true); |
906a3c6f | 8868 | |
3b763ba1 PB |
8869 | /* |
8870 | * Don't submit if refs are dying, good for io_uring_register(), | |
8871 | * but also it is relied upon by io_ring_exit_work() | |
8872 | */ | |
0298ef96 PB |
8873 | if (to_submit && likely(!percpu_ref_is_dying(&ctx->refs)) && |
8874 | !(ctx->flags & IORING_SETUP_R_DISABLED)) | |
08369246 | 8875 | ret = io_submit_sqes(ctx, to_submit); |
c8d1ba58 | 8876 | mutex_unlock(&ctx->uring_lock); |
cb318216 | 8877 | |
acfb381d PB |
8878 | if (to_submit && wq_has_sleeper(&ctx->sqo_sq_wait)) |
8879 | wake_up(&ctx->sqo_sq_wait); | |
948e1947 PB |
8880 | if (creds) |
8881 | revert_creds(creds); | |
acfb381d | 8882 | } |
6c271ce2 | 8883 | |
08369246 XW |
8884 | return ret; |
8885 | } | |
6c271ce2 | 8886 | |
c072481d | 8887 | static __cold void io_sqd_update_thread_idle(struct io_sq_data *sqd) |
08369246 XW |
8888 | { |
8889 | struct io_ring_ctx *ctx; | |
8890 | unsigned sq_thread_idle = 0; | |
6c271ce2 | 8891 | |
c9dca27d PB |
8892 | list_for_each_entry(ctx, &sqd->ctx_list, sqd_list) |
8893 | sq_thread_idle = max(sq_thread_idle, ctx->sq_thread_idle); | |
08369246 | 8894 | sqd->sq_thread_idle = sq_thread_idle; |
c8d1ba58 | 8895 | } |
6c271ce2 | 8896 | |
e4b6d902 PB |
8897 | static bool io_sqd_handle_event(struct io_sq_data *sqd) |
8898 | { | |
8899 | bool did_sig = false; | |
8900 | struct ksignal ksig; | |
8901 | ||
8902 | if (test_bit(IO_SQ_THREAD_SHOULD_PARK, &sqd->state) || | |
8903 | signal_pending(current)) { | |
8904 | mutex_unlock(&sqd->lock); | |
8905 | if (signal_pending(current)) | |
8906 | did_sig = get_signal(&ksig); | |
8907 | cond_resched(); | |
8908 | mutex_lock(&sqd->lock); | |
8909 | } | |
e4b6d902 PB |
8910 | return did_sig || test_bit(IO_SQ_THREAD_SHOULD_STOP, &sqd->state); |
8911 | } | |
8912 | ||
c8d1ba58 JA |
8913 | static int io_sq_thread(void *data) |
8914 | { | |
69fb2131 JA |
8915 | struct io_sq_data *sqd = data; |
8916 | struct io_ring_ctx *ctx; | |
a0d9205f | 8917 | unsigned long timeout = 0; |
37d1e2e3 | 8918 | char buf[TASK_COMM_LEN]; |
08369246 | 8919 | DEFINE_WAIT(wait); |
6c271ce2 | 8920 | |
696ee88a | 8921 | snprintf(buf, sizeof(buf), "iou-sqp-%d", sqd->task_pid); |
37d1e2e3 | 8922 | set_task_comm(current, buf); |
37d1e2e3 JA |
8923 | |
8924 | if (sqd->sq_cpu != -1) | |
8925 | set_cpus_allowed_ptr(current, cpumask_of(sqd->sq_cpu)); | |
8926 | else | |
8927 | set_cpus_allowed_ptr(current, cpu_online_mask); | |
8928 | current->flags |= PF_NO_SETAFFINITY; | |
8929 | ||
5bd2182d PM |
8930 | audit_alloc_kernel(current); |
8931 | ||
09a6f4ef | 8932 | mutex_lock(&sqd->lock); |
e4b6d902 | 8933 | while (1) { |
1a924a80 | 8934 | bool cap_entries, sqt_spin = false; |
c1edbf5f | 8935 | |
e4b6d902 PB |
8936 | if (io_sqd_events_pending(sqd) || signal_pending(current)) { |
8937 | if (io_sqd_handle_event(sqd)) | |
c7d95613 | 8938 | break; |
08369246 XW |
8939 | timeout = jiffies + sqd->sq_thread_idle; |
8940 | } | |
e4b6d902 | 8941 | |
e95eee2d | 8942 | cap_entries = !list_is_singular(&sqd->ctx_list); |
69fb2131 | 8943 | list_for_each_entry(ctx, &sqd->ctx_list, sqd_list) { |
948e1947 | 8944 | int ret = __io_sq_thread(ctx, cap_entries); |
7c30f36a | 8945 | |
5eef4e87 | 8946 | if (!sqt_spin && (ret > 0 || !wq_list_empty(&ctx->iopoll_list))) |
08369246 | 8947 | sqt_spin = true; |
69fb2131 | 8948 | } |
dd432ea5 PB |
8949 | if (io_run_task_work()) |
8950 | sqt_spin = true; | |
6c271ce2 | 8951 | |
08369246 | 8952 | if (sqt_spin || !time_after(jiffies, timeout)) { |
c8d1ba58 | 8953 | cond_resched(); |
08369246 XW |
8954 | if (sqt_spin) |
8955 | timeout = jiffies + sqd->sq_thread_idle; | |
8956 | continue; | |
8957 | } | |
8958 | ||
08369246 | 8959 | prepare_to_wait(&sqd->wait, &wait, TASK_INTERRUPTIBLE); |
7f62d40d | 8960 | if (!io_sqd_events_pending(sqd) && !task_work_pending(current)) { |
1a924a80 PB |
8961 | bool needs_sched = true; |
8962 | ||
724cb4f9 | 8963 | list_for_each_entry(ctx, &sqd->ctx_list, sqd_list) { |
3a4b89a2 JA |
8964 | atomic_or(IORING_SQ_NEED_WAKEUP, |
8965 | &ctx->rings->sq_flags); | |
724cb4f9 | 8966 | if ((ctx->flags & IORING_SETUP_IOPOLL) && |
5eef4e87 | 8967 | !wq_list_empty(&ctx->iopoll_list)) { |
724cb4f9 HX |
8968 | needs_sched = false; |
8969 | break; | |
8970 | } | |
649bb75d AK |
8971 | |
8972 | /* | |
8973 | * Ensure the store of the wakeup flag is not | |
8974 | * reordered with the load of the SQ tail | |
8975 | */ | |
f2e030dd | 8976 | smp_mb__after_atomic(); |
649bb75d | 8977 | |
724cb4f9 HX |
8978 | if (io_sqring_entries(ctx)) { |
8979 | needs_sched = false; | |
8980 | break; | |
8981 | } | |
8982 | } | |
8983 | ||
8984 | if (needs_sched) { | |
8985 | mutex_unlock(&sqd->lock); | |
8986 | schedule(); | |
8987 | mutex_lock(&sqd->lock); | |
8988 | } | |
69fb2131 | 8989 | list_for_each_entry(ctx, &sqd->ctx_list, sqd_list) |
3a4b89a2 JA |
8990 | atomic_andnot(IORING_SQ_NEED_WAKEUP, |
8991 | &ctx->rings->sq_flags); | |
6c271ce2 | 8992 | } |
08369246 XW |
8993 | |
8994 | finish_wait(&sqd->wait, &wait); | |
8995 | timeout = jiffies + sqd->sq_thread_idle; | |
6c271ce2 | 8996 | } |
28cea78a | 8997 | |
78cc687b | 8998 | io_uring_cancel_generic(true, sqd); |
37d1e2e3 | 8999 | sqd->thread = NULL; |
05962f95 | 9000 | list_for_each_entry(ctx, &sqd->ctx_list, sqd_list) |
3a4b89a2 | 9001 | atomic_or(IORING_SQ_NEED_WAKEUP, &ctx->rings->sq_flags); |
521d6a73 | 9002 | io_run_task_work(); |
734551df PB |
9003 | mutex_unlock(&sqd->lock); |
9004 | ||
5bd2182d PM |
9005 | audit_free(current); |
9006 | ||
37d1e2e3 JA |
9007 | complete(&sqd->exited); |
9008 | do_exit(0); | |
6c271ce2 JA |
9009 | } |
9010 | ||
bda52162 JA |
9011 | struct io_wait_queue { |
9012 | struct wait_queue_entry wq; | |
9013 | struct io_ring_ctx *ctx; | |
5fd46178 | 9014 | unsigned cq_tail; |
bda52162 JA |
9015 | unsigned nr_timeouts; |
9016 | }; | |
9017 | ||
6c503150 | 9018 | static inline bool io_should_wake(struct io_wait_queue *iowq) |
bda52162 JA |
9019 | { |
9020 | struct io_ring_ctx *ctx = iowq->ctx; | |
5fd46178 | 9021 | int dist = ctx->cached_cq_tail - (int) iowq->cq_tail; |
bda52162 JA |
9022 | |
9023 | /* | |
d195a66e | 9024 | * Wake up if we have enough events, or if a timeout occurred since we |
bda52162 JA |
9025 | * started waiting. For timeouts, we always want to return to userspace, |
9026 | * regardless of event count. | |
9027 | */ | |
5fd46178 | 9028 | return dist >= 0 || atomic_read(&ctx->cq_timeouts) != iowq->nr_timeouts; |
bda52162 JA |
9029 | } |
9030 | ||
9031 | static int io_wake_function(struct wait_queue_entry *curr, unsigned int mode, | |
9032 | int wake_flags, void *key) | |
9033 | { | |
9034 | struct io_wait_queue *iowq = container_of(curr, struct io_wait_queue, | |
9035 | wq); | |
9036 | ||
6c503150 PB |
9037 | /* |
9038 | * Cannot safely flush overflowed CQEs from here, ensure we wake up | |
9039 | * the task, and the next invocation will do it. | |
9040 | */ | |
10988a0a DY |
9041 | if (io_should_wake(iowq) || |
9042 | test_bit(IO_CHECK_CQ_OVERFLOW_BIT, &iowq->ctx->check_cq)) | |
6c503150 PB |
9043 | return autoremove_wake_function(curr, mode, wake_flags, key); |
9044 | return -1; | |
bda52162 JA |
9045 | } |
9046 | ||
af9c1a44 JA |
9047 | static int io_run_task_work_sig(void) |
9048 | { | |
9049 | if (io_run_task_work()) | |
9050 | return 1; | |
0b8cfa97 | 9051 | if (test_thread_flag(TIF_NOTIFY_SIGNAL)) |
792ee0f6 | 9052 | return -ERESTARTSYS; |
c5020bc8 OL |
9053 | if (task_sigpending(current)) |
9054 | return -EINTR; | |
9055 | return 0; | |
af9c1a44 JA |
9056 | } |
9057 | ||
eeb60b9a PB |
9058 | /* when returns >0, the caller should retry */ |
9059 | static inline int io_cqring_wait_schedule(struct io_ring_ctx *ctx, | |
9060 | struct io_wait_queue *iowq, | |
22833966 | 9061 | ktime_t timeout) |
eeb60b9a PB |
9062 | { |
9063 | int ret; | |
155bc950 | 9064 | unsigned long check_cq; |
eeb60b9a PB |
9065 | |
9066 | /* make sure we run task_work before checking for signals */ | |
9067 | ret = io_run_task_work_sig(); | |
9068 | if (ret || io_should_wake(iowq)) | |
9069 | return ret; | |
155bc950 | 9070 | check_cq = READ_ONCE(ctx->check_cq); |
eeb60b9a | 9071 | /* let the caller flush overflows, retry */ |
155bc950 | 9072 | if (check_cq & BIT(IO_CHECK_CQ_OVERFLOW_BIT)) |
eeb60b9a | 9073 | return 1; |
155bc950 DY |
9074 | if (unlikely(check_cq & BIT(IO_CHECK_CQ_DROPPED_BIT))) |
9075 | return -EBADR; | |
22833966 JA |
9076 | if (!schedule_hrtimeout(&timeout, HRTIMER_MODE_ABS)) |
9077 | return -ETIME; | |
9078 | return 1; | |
eeb60b9a PB |
9079 | } |
9080 | ||
2b188cc1 JA |
9081 | /* |
9082 | * Wait until events become available, if we don't already have some. The | |
9083 | * application must reap them itself, as they reside on the shared cq ring. | |
9084 | */ | |
9085 | static int io_cqring_wait(struct io_ring_ctx *ctx, int min_events, | |
c73ebb68 HX |
9086 | const sigset_t __user *sig, size_t sigsz, |
9087 | struct __kernel_timespec __user *uts) | |
2b188cc1 | 9088 | { |
90291099 | 9089 | struct io_wait_queue iowq; |
75b28aff | 9090 | struct io_rings *rings = ctx->rings; |
22833966 | 9091 | ktime_t timeout = KTIME_MAX; |
c1d5a224 | 9092 | int ret; |
2b188cc1 | 9093 | |
b41e9852 | 9094 | do { |
90f67366 | 9095 | io_cqring_overflow_flush(ctx); |
6c503150 | 9096 | if (io_cqring_events(ctx) >= min_events) |
b41e9852 | 9097 | return 0; |
4c6e277c | 9098 | if (!io_run_task_work()) |
b41e9852 | 9099 | break; |
b41e9852 | 9100 | } while (1); |
2b188cc1 JA |
9101 | |
9102 | if (sig) { | |
9e75ad5d AB |
9103 | #ifdef CONFIG_COMPAT |
9104 | if (in_compat_syscall()) | |
9105 | ret = set_compat_user_sigmask((const compat_sigset_t __user *)sig, | |
b772434b | 9106 | sigsz); |
9e75ad5d AB |
9107 | else |
9108 | #endif | |
b772434b | 9109 | ret = set_user_sigmask(sig, sigsz); |
9e75ad5d | 9110 | |
2b188cc1 JA |
9111 | if (ret) |
9112 | return ret; | |
9113 | } | |
9114 | ||
950e79dd OL |
9115 | if (uts) { |
9116 | struct timespec64 ts; | |
9117 | ||
9118 | if (get_timespec64(&ts, uts)) | |
9119 | return -EFAULT; | |
9120 | timeout = ktime_add_ns(timespec64_to_ktime(ts), ktime_get_ns()); | |
9121 | } | |
9122 | ||
90291099 PB |
9123 | init_waitqueue_func_entry(&iowq.wq, io_wake_function); |
9124 | iowq.wq.private = current; | |
9125 | INIT_LIST_HEAD(&iowq.wq.entry); | |
9126 | iowq.ctx = ctx; | |
bda52162 | 9127 | iowq.nr_timeouts = atomic_read(&ctx->cq_timeouts); |
5fd46178 | 9128 | iowq.cq_tail = READ_ONCE(ctx->rings->cq.head) + min_events; |
90291099 | 9129 | |
c826bd7a | 9130 | trace_io_uring_cqring_wait(ctx, min_events); |
bda52162 | 9131 | do { |
ca0a2651 | 9132 | /* if we can't even flush overflow, don't wait for more */ |
90f67366 | 9133 | if (!io_cqring_overflow_flush(ctx)) { |
ca0a2651 JA |
9134 | ret = -EBUSY; |
9135 | break; | |
9136 | } | |
311997b3 | 9137 | prepare_to_wait_exclusive(&ctx->cq_wait, &iowq.wq, |
bda52162 | 9138 | TASK_INTERRUPTIBLE); |
22833966 | 9139 | ret = io_cqring_wait_schedule(ctx, &iowq, timeout); |
ca0a2651 | 9140 | cond_resched(); |
eeb60b9a | 9141 | } while (ret > 0); |
bda52162 | 9142 | |
b4f20bb4 | 9143 | finish_wait(&ctx->cq_wait, &iowq.wq); |
b7db41c9 | 9144 | restore_saved_sigmask_unless(ret == -EINTR); |
2b188cc1 | 9145 | |
75b28aff | 9146 | return READ_ONCE(rings->cq.head) == READ_ONCE(rings->cq.tail) ? ret : 0; |
2b188cc1 JA |
9147 | } |
9148 | ||
9123c8ff | 9149 | static void io_free_page_table(void **table, size_t size) |
05f3fb3c | 9150 | { |
9123c8ff | 9151 | unsigned i, nr_tables = DIV_ROUND_UP(size, PAGE_SIZE); |
05f3fb3c | 9152 | |
846a4ef2 | 9153 | for (i = 0; i < nr_tables; i++) |
9123c8ff PB |
9154 | kfree(table[i]); |
9155 | kfree(table); | |
9156 | } | |
9157 | ||
c072481d | 9158 | static __cold void **io_alloc_page_table(size_t size) |
9123c8ff PB |
9159 | { |
9160 | unsigned i, nr_tables = DIV_ROUND_UP(size, PAGE_SIZE); | |
9161 | size_t init_size = size; | |
9162 | void **table; | |
9163 | ||
0bea96f5 | 9164 | table = kcalloc(nr_tables, sizeof(*table), GFP_KERNEL_ACCOUNT); |
9123c8ff PB |
9165 | if (!table) |
9166 | return NULL; | |
9167 | ||
9168 | for (i = 0; i < nr_tables; i++) { | |
27f6b318 | 9169 | unsigned int this_size = min_t(size_t, size, PAGE_SIZE); |
9123c8ff | 9170 | |
0bea96f5 | 9171 | table[i] = kzalloc(this_size, GFP_KERNEL_ACCOUNT); |
9123c8ff PB |
9172 | if (!table[i]) { |
9173 | io_free_page_table(table, init_size); | |
9174 | return NULL; | |
9175 | } | |
9176 | size -= this_size; | |
9177 | } | |
9178 | return table; | |
05f3fb3c JA |
9179 | } |
9180 | ||
28a9fe25 | 9181 | static void io_rsrc_node_destroy(struct io_rsrc_node *ref_node) |
1642b445 | 9182 | { |
28a9fe25 PB |
9183 | percpu_ref_exit(&ref_node->refs); |
9184 | kfree(ref_node); | |
1642b445 PB |
9185 | } |
9186 | ||
c072481d | 9187 | static __cold void io_rsrc_node_ref_zero(struct percpu_ref *ref) |
b9bd2bea PB |
9188 | { |
9189 | struct io_rsrc_node *node = container_of(ref, struct io_rsrc_node, refs); | |
9190 | struct io_ring_ctx *ctx = node->rsrc_data->ctx; | |
9191 | unsigned long flags; | |
9192 | bool first_add = false; | |
b36a2050 | 9193 | unsigned long delay = HZ; |
b9bd2bea PB |
9194 | |
9195 | spin_lock_irqsave(&ctx->rsrc_ref_lock, flags); | |
9196 | node->done = true; | |
9197 | ||
b36a2050 DY |
9198 | /* if we are mid-quiesce then do not delay */ |
9199 | if (node->rsrc_data->quiesce) | |
9200 | delay = 0; | |
9201 | ||
b9bd2bea PB |
9202 | while (!list_empty(&ctx->rsrc_ref_list)) { |
9203 | node = list_first_entry(&ctx->rsrc_ref_list, | |
9204 | struct io_rsrc_node, node); | |
9205 | /* recycle ref nodes in order */ | |
9206 | if (!node->done) | |
9207 | break; | |
9208 | list_del(&node->node); | |
9209 | first_add |= llist_add(&node->llist, &ctx->rsrc_put_llist); | |
9210 | } | |
9211 | spin_unlock_irqrestore(&ctx->rsrc_ref_lock, flags); | |
9212 | ||
9213 | if (first_add) | |
b36a2050 | 9214 | mod_delayed_work(system_wq, &ctx->rsrc_put_work, delay); |
b9bd2bea PB |
9215 | } |
9216 | ||
f6133fbd | 9217 | static struct io_rsrc_node *io_rsrc_node_alloc(void) |
b9bd2bea PB |
9218 | { |
9219 | struct io_rsrc_node *ref_node; | |
9220 | ||
9221 | ref_node = kzalloc(sizeof(*ref_node), GFP_KERNEL); | |
9222 | if (!ref_node) | |
9223 | return NULL; | |
9224 | ||
9225 | if (percpu_ref_init(&ref_node->refs, io_rsrc_node_ref_zero, | |
9226 | 0, GFP_KERNEL)) { | |
9227 | kfree(ref_node); | |
9228 | return NULL; | |
9229 | } | |
9230 | INIT_LIST_HEAD(&ref_node->node); | |
9231 | INIT_LIST_HEAD(&ref_node->rsrc_list); | |
9232 | ref_node->done = false; | |
9233 | return ref_node; | |
9234 | } | |
9235 | ||
a7f0ed5a PB |
9236 | static void io_rsrc_node_switch(struct io_ring_ctx *ctx, |
9237 | struct io_rsrc_data *data_to_kill) | |
ab409402 | 9238 | __must_hold(&ctx->uring_lock) |
6b06314c | 9239 | { |
a7f0ed5a PB |
9240 | WARN_ON_ONCE(!ctx->rsrc_backup_node); |
9241 | WARN_ON_ONCE(data_to_kill && !ctx->rsrc_node); | |
6b06314c | 9242 | |
ab409402 PB |
9243 | io_rsrc_refs_drop(ctx); |
9244 | ||
a7f0ed5a PB |
9245 | if (data_to_kill) { |
9246 | struct io_rsrc_node *rsrc_node = ctx->rsrc_node; | |
82fbcfa9 | 9247 | |
a7f0ed5a | 9248 | rsrc_node->rsrc_data = data_to_kill; |
4956b9ea | 9249 | spin_lock_irq(&ctx->rsrc_ref_lock); |
a7f0ed5a | 9250 | list_add_tail(&rsrc_node->node, &ctx->rsrc_ref_list); |
4956b9ea | 9251 | spin_unlock_irq(&ctx->rsrc_ref_lock); |
82fbcfa9 | 9252 | |
3e942498 | 9253 | atomic_inc(&data_to_kill->refs); |
a7f0ed5a PB |
9254 | percpu_ref_kill(&rsrc_node->refs); |
9255 | ctx->rsrc_node = NULL; | |
9256 | } | |
6b06314c | 9257 | |
a7f0ed5a PB |
9258 | if (!ctx->rsrc_node) { |
9259 | ctx->rsrc_node = ctx->rsrc_backup_node; | |
9260 | ctx->rsrc_backup_node = NULL; | |
9261 | } | |
8bad28d8 HX |
9262 | } |
9263 | ||
a7f0ed5a | 9264 | static int io_rsrc_node_switch_start(struct io_ring_ctx *ctx) |
8dd03afe PB |
9265 | { |
9266 | if (ctx->rsrc_backup_node) | |
9267 | return 0; | |
f6133fbd | 9268 | ctx->rsrc_backup_node = io_rsrc_node_alloc(); |
8dd03afe | 9269 | return ctx->rsrc_backup_node ? 0 : -ENOMEM; |
8bad28d8 HX |
9270 | } |
9271 | ||
c072481d PB |
9272 | static __cold int io_rsrc_ref_quiesce(struct io_rsrc_data *data, |
9273 | struct io_ring_ctx *ctx) | |
8bad28d8 HX |
9274 | { |
9275 | int ret; | |
05589553 | 9276 | |
215c3902 | 9277 | /* As we may drop ->uring_lock, other task may have started quiesce */ |
8bad28d8 HX |
9278 | if (data->quiesce) |
9279 | return -ENXIO; | |
05589553 | 9280 | |
8bad28d8 | 9281 | data->quiesce = true; |
1ffc5422 | 9282 | do { |
a7f0ed5a | 9283 | ret = io_rsrc_node_switch_start(ctx); |
8dd03afe | 9284 | if (ret) |
f2303b1f | 9285 | break; |
a7f0ed5a | 9286 | io_rsrc_node_switch(ctx, data); |
f2303b1f | 9287 | |
3e942498 PB |
9288 | /* kill initial ref, already quiesced if zero */ |
9289 | if (atomic_dec_and_test(&data->refs)) | |
9290 | break; | |
c018db4a | 9291 | mutex_unlock(&ctx->uring_lock); |
8bad28d8 | 9292 | flush_delayed_work(&ctx->rsrc_put_work); |
1ffc5422 | 9293 | ret = wait_for_completion_interruptible(&data->done); |
c018db4a JA |
9294 | if (!ret) { |
9295 | mutex_lock(&ctx->uring_lock); | |
80912cef DY |
9296 | if (atomic_read(&data->refs) > 0) { |
9297 | /* | |
9298 | * it has been revived by another thread while | |
9299 | * we were unlocked | |
9300 | */ | |
9301 | mutex_unlock(&ctx->uring_lock); | |
9302 | } else { | |
9303 | break; | |
9304 | } | |
c018db4a | 9305 | } |
8bad28d8 | 9306 | |
3e942498 PB |
9307 | atomic_inc(&data->refs); |
9308 | /* wait for all works potentially completing data->done */ | |
9309 | flush_delayed_work(&ctx->rsrc_put_work); | |
cb5e1b81 | 9310 | reinit_completion(&data->done); |
8dd03afe | 9311 | |
1ffc5422 | 9312 | ret = io_run_task_work_sig(); |
8bad28d8 | 9313 | mutex_lock(&ctx->uring_lock); |
f2303b1f | 9314 | } while (ret >= 0); |
8bad28d8 | 9315 | data->quiesce = false; |
05f3fb3c | 9316 | |
8bad28d8 | 9317 | return ret; |
d7954b2b BM |
9318 | } |
9319 | ||
2d091d62 PB |
9320 | static u64 *io_get_tag_slot(struct io_rsrc_data *data, unsigned int idx) |
9321 | { | |
9322 | unsigned int off = idx & IO_RSRC_TAG_TABLE_MASK; | |
9323 | unsigned int table_idx = idx >> IO_RSRC_TAG_TABLE_SHIFT; | |
9324 | ||
9325 | return &data->tags[table_idx][off]; | |
9326 | } | |
9327 | ||
44b31f2f | 9328 | static void io_rsrc_data_free(struct io_rsrc_data *data) |
1ad555c6 | 9329 | { |
2d091d62 PB |
9330 | size_t size = data->nr * sizeof(data->tags[0][0]); |
9331 | ||
9332 | if (data->tags) | |
9333 | io_free_page_table((void **)data->tags, size); | |
44b31f2f PB |
9334 | kfree(data); |
9335 | } | |
9336 | ||
c072481d PB |
9337 | static __cold int io_rsrc_data_alloc(struct io_ring_ctx *ctx, rsrc_put_fn *do_put, |
9338 | u64 __user *utags, unsigned nr, | |
9339 | struct io_rsrc_data **pdata) | |
1ad555c6 | 9340 | { |
b895c9a6 | 9341 | struct io_rsrc_data *data; |
2d091d62 | 9342 | int ret = -ENOMEM; |
d878c816 | 9343 | unsigned i; |
1ad555c6 BM |
9344 | |
9345 | data = kzalloc(sizeof(*data), GFP_KERNEL); | |
9346 | if (!data) | |
d878c816 | 9347 | return -ENOMEM; |
2d091d62 | 9348 | data->tags = (u64 **)io_alloc_page_table(nr * sizeof(data->tags[0][0])); |
b60c8dce | 9349 | if (!data->tags) { |
1ad555c6 | 9350 | kfree(data); |
d878c816 PB |
9351 | return -ENOMEM; |
9352 | } | |
2d091d62 PB |
9353 | |
9354 | data->nr = nr; | |
9355 | data->ctx = ctx; | |
9356 | data->do_put = do_put; | |
d878c816 | 9357 | if (utags) { |
2d091d62 | 9358 | ret = -EFAULT; |
d878c816 | 9359 | for (i = 0; i < nr; i++) { |
fdd1dc31 CIK |
9360 | u64 *tag_slot = io_get_tag_slot(data, i); |
9361 | ||
9362 | if (copy_from_user(tag_slot, &utags[i], | |
9363 | sizeof(*tag_slot))) | |
2d091d62 | 9364 | goto fail; |
d878c816 | 9365 | } |
1ad555c6 | 9366 | } |
b60c8dce | 9367 | |
3e942498 | 9368 | atomic_set(&data->refs, 1); |
1ad555c6 | 9369 | init_completion(&data->done); |
d878c816 PB |
9370 | *pdata = data; |
9371 | return 0; | |
2d091d62 PB |
9372 | fail: |
9373 | io_rsrc_data_free(data); | |
9374 | return ret; | |
1ad555c6 BM |
9375 | } |
9376 | ||
9123c8ff PB |
9377 | static bool io_alloc_file_tables(struct io_file_table *table, unsigned nr_files) |
9378 | { | |
0bea96f5 PB |
9379 | table->files = kvcalloc(nr_files, sizeof(table->files[0]), |
9380 | GFP_KERNEL_ACCOUNT); | |
9123c8ff PB |
9381 | return !!table->files; |
9382 | } | |
9383 | ||
042b0d85 | 9384 | static void io_free_file_tables(struct io_file_table *table) |
9123c8ff | 9385 | { |
042b0d85 | 9386 | kvfree(table->files); |
9123c8ff PB |
9387 | table->files = NULL; |
9388 | } | |
9389 | ||
fff4db76 | 9390 | static void __io_sqe_files_unregister(struct io_ring_ctx *ctx) |
1ad555c6 | 9391 | { |
69cc1b6f | 9392 | #if !defined(IO_URING_SCM_ALL) |
1f59bc0f PB |
9393 | int i; |
9394 | ||
9395 | for (i = 0; i < ctx->nr_user_files; i++) { | |
9396 | struct file *file = io_file_from_index(ctx, i); | |
9397 | ||
5e45690a JA |
9398 | if (!file) |
9399 | continue; | |
9400 | if (io_fixed_file_slot(&ctx->file_table, i)->file_ptr & FFS_SCM) | |
1f59bc0f | 9401 | continue; |
1f59bc0f PB |
9402 | fput(file); |
9403 | } | |
5e45690a | 9404 | #endif |
1f59bc0f | 9405 | |
fff4db76 PB |
9406 | #if defined(CONFIG_UNIX) |
9407 | if (ctx->ring_sock) { | |
9408 | struct sock *sock = ctx->ring_sock->sk; | |
9409 | struct sk_buff *skb; | |
9410 | ||
9411 | while ((skb = skb_dequeue(&sock->sk_receive_queue)) != NULL) | |
9412 | kfree_skb(skb); | |
9413 | } | |
fff4db76 | 9414 | #endif |
042b0d85 | 9415 | io_free_file_tables(&ctx->file_table); |
44b31f2f | 9416 | io_rsrc_data_free(ctx->file_data); |
fff4db76 PB |
9417 | ctx->file_data = NULL; |
9418 | ctx->nr_user_files = 0; | |
1ad555c6 BM |
9419 | } |
9420 | ||
d7954b2b BM |
9421 | static int io_sqe_files_unregister(struct io_ring_ctx *ctx) |
9422 | { | |
d7954b2b BM |
9423 | int ret; |
9424 | ||
08480400 | 9425 | if (!ctx->file_data) |
d7954b2b | 9426 | return -ENXIO; |
08480400 PB |
9427 | ret = io_rsrc_ref_quiesce(ctx->file_data, ctx); |
9428 | if (!ret) | |
9429 | __io_sqe_files_unregister(ctx); | |
9430 | return ret; | |
6b06314c JA |
9431 | } |
9432 | ||
37d1e2e3 | 9433 | static void io_sq_thread_unpark(struct io_sq_data *sqd) |
09a6f4ef | 9434 | __releases(&sqd->lock) |
37d1e2e3 | 9435 | { |
521d6a73 PB |
9436 | WARN_ON_ONCE(sqd->thread == current); |
9437 | ||
9e138a48 PB |
9438 | /* |
9439 | * Do the dance but not conditional clear_bit() because it'd race with | |
9440 | * other threads incrementing park_pending and setting the bit. | |
9441 | */ | |
37d1e2e3 | 9442 | clear_bit(IO_SQ_THREAD_SHOULD_PARK, &sqd->state); |
9e138a48 PB |
9443 | if (atomic_dec_return(&sqd->park_pending)) |
9444 | set_bit(IO_SQ_THREAD_SHOULD_PARK, &sqd->state); | |
09a6f4ef | 9445 | mutex_unlock(&sqd->lock); |
37d1e2e3 JA |
9446 | } |
9447 | ||
86e0d676 | 9448 | static void io_sq_thread_park(struct io_sq_data *sqd) |
09a6f4ef | 9449 | __acquires(&sqd->lock) |
37d1e2e3 | 9450 | { |
521d6a73 PB |
9451 | WARN_ON_ONCE(sqd->thread == current); |
9452 | ||
9e138a48 | 9453 | atomic_inc(&sqd->park_pending); |
86e0d676 | 9454 | set_bit(IO_SQ_THREAD_SHOULD_PARK, &sqd->state); |
09a6f4ef | 9455 | mutex_lock(&sqd->lock); |
05962f95 | 9456 | if (sqd->thread) |
86e0d676 | 9457 | wake_up_process(sqd->thread); |
37d1e2e3 JA |
9458 | } |
9459 | ||
9460 | static void io_sq_thread_stop(struct io_sq_data *sqd) | |
9461 | { | |
521d6a73 | 9462 | WARN_ON_ONCE(sqd->thread == current); |
88885f66 | 9463 | WARN_ON_ONCE(test_bit(IO_SQ_THREAD_SHOULD_STOP, &sqd->state)); |
521d6a73 | 9464 | |
05962f95 | 9465 | set_bit(IO_SQ_THREAD_SHOULD_STOP, &sqd->state); |
88885f66 | 9466 | mutex_lock(&sqd->lock); |
e8f98f24 JA |
9467 | if (sqd->thread) |
9468 | wake_up_process(sqd->thread); | |
09a6f4ef | 9469 | mutex_unlock(&sqd->lock); |
05962f95 | 9470 | wait_for_completion(&sqd->exited); |
37d1e2e3 JA |
9471 | } |
9472 | ||
534ca6d6 | 9473 | static void io_put_sq_data(struct io_sq_data *sqd) |
6c271ce2 | 9474 | { |
534ca6d6 | 9475 | if (refcount_dec_and_test(&sqd->refs)) { |
9e138a48 PB |
9476 | WARN_ON_ONCE(atomic_read(&sqd->park_pending)); |
9477 | ||
37d1e2e3 JA |
9478 | io_sq_thread_stop(sqd); |
9479 | kfree(sqd); | |
9480 | } | |
9481 | } | |
9482 | ||
9483 | static void io_sq_thread_finish(struct io_ring_ctx *ctx) | |
9484 | { | |
9485 | struct io_sq_data *sqd = ctx->sq_data; | |
9486 | ||
9487 | if (sqd) { | |
05962f95 | 9488 | io_sq_thread_park(sqd); |
521d6a73 | 9489 | list_del_init(&ctx->sqd_list); |
37d1e2e3 | 9490 | io_sqd_update_thread_idle(sqd); |
05962f95 | 9491 | io_sq_thread_unpark(sqd); |
37d1e2e3 JA |
9492 | |
9493 | io_put_sq_data(sqd); | |
9494 | ctx->sq_data = NULL; | |
534ca6d6 JA |
9495 | } |
9496 | } | |
9497 | ||
aa06165d JA |
9498 | static struct io_sq_data *io_attach_sq_data(struct io_uring_params *p) |
9499 | { | |
9500 | struct io_ring_ctx *ctx_attach; | |
9501 | struct io_sq_data *sqd; | |
9502 | struct fd f; | |
9503 | ||
9504 | f = fdget(p->wq_fd); | |
9505 | if (!f.file) | |
9506 | return ERR_PTR(-ENXIO); | |
9507 | if (f.file->f_op != &io_uring_fops) { | |
9508 | fdput(f); | |
9509 | return ERR_PTR(-EINVAL); | |
9510 | } | |
9511 | ||
9512 | ctx_attach = f.file->private_data; | |
9513 | sqd = ctx_attach->sq_data; | |
9514 | if (!sqd) { | |
9515 | fdput(f); | |
9516 | return ERR_PTR(-EINVAL); | |
9517 | } | |
5c2469e0 JA |
9518 | if (sqd->task_tgid != current->tgid) { |
9519 | fdput(f); | |
9520 | return ERR_PTR(-EPERM); | |
9521 | } | |
aa06165d JA |
9522 | |
9523 | refcount_inc(&sqd->refs); | |
9524 | fdput(f); | |
9525 | return sqd; | |
9526 | } | |
9527 | ||
26984fbf PB |
9528 | static struct io_sq_data *io_get_sq_data(struct io_uring_params *p, |
9529 | bool *attached) | |
534ca6d6 JA |
9530 | { |
9531 | struct io_sq_data *sqd; | |
9532 | ||
26984fbf | 9533 | *attached = false; |
5c2469e0 JA |
9534 | if (p->flags & IORING_SETUP_ATTACH_WQ) { |
9535 | sqd = io_attach_sq_data(p); | |
26984fbf PB |
9536 | if (!IS_ERR(sqd)) { |
9537 | *attached = true; | |
5c2469e0 | 9538 | return sqd; |
26984fbf | 9539 | } |
5c2469e0 JA |
9540 | /* fall through for EPERM case, setup new sqd/task */ |
9541 | if (PTR_ERR(sqd) != -EPERM) | |
9542 | return sqd; | |
9543 | } | |
aa06165d | 9544 | |
534ca6d6 JA |
9545 | sqd = kzalloc(sizeof(*sqd), GFP_KERNEL); |
9546 | if (!sqd) | |
9547 | return ERR_PTR(-ENOMEM); | |
9548 | ||
9e138a48 | 9549 | atomic_set(&sqd->park_pending, 0); |
534ca6d6 | 9550 | refcount_set(&sqd->refs, 1); |
69fb2131 | 9551 | INIT_LIST_HEAD(&sqd->ctx_list); |
09a6f4ef | 9552 | mutex_init(&sqd->lock); |
534ca6d6 | 9553 | init_waitqueue_head(&sqd->wait); |
37d1e2e3 | 9554 | init_completion(&sqd->exited); |
534ca6d6 JA |
9555 | return sqd; |
9556 | } | |
9557 | ||
6b06314c JA |
9558 | /* |
9559 | * Ensure the UNIX gc is aware of our file set, so we are certain that | |
9560 | * the io_uring can be safely unregistered on process exit, even if we have | |
1f59bc0f PB |
9561 | * loops in the file referencing. We account only files that can hold other |
9562 | * files because otherwise they can't form a loop and so are not interesting | |
9563 | * for GC. | |
6b06314c | 9564 | */ |
8b3171bd | 9565 | static int io_scm_file_account(struct io_ring_ctx *ctx, struct file *file) |
6b06314c | 9566 | { |
73b25d3b | 9567 | #if defined(CONFIG_UNIX) |
6b06314c | 9568 | struct sock *sk = ctx->ring_sock->sk; |
73b25d3b | 9569 | struct sk_buff_head *head = &sk->sk_receive_queue; |
6b06314c JA |
9570 | struct scm_fp_list *fpl; |
9571 | struct sk_buff *skb; | |
6b06314c | 9572 | |
73b25d3b PB |
9573 | if (likely(!io_file_need_scm(file))) |
9574 | return 0; | |
6b06314c | 9575 | |
73b25d3b PB |
9576 | /* |
9577 | * See if we can merge this file into an existing skb SCM_RIGHTS | |
9578 | * file set. If there's no room, fall back to allocating a new skb | |
9579 | * and filling it in. | |
9580 | */ | |
9581 | spin_lock_irq(&head->lock); | |
9582 | skb = skb_peek(head); | |
9583 | if (skb && UNIXCB(skb).fp->count < SCM_MAX_FD) | |
9584 | __skb_unlink(skb, head); | |
9585 | else | |
9586 | skb = NULL; | |
9587 | spin_unlock_irq(&head->lock); | |
6b06314c | 9588 | |
6b06314c | 9589 | if (!skb) { |
73b25d3b PB |
9590 | fpl = kzalloc(sizeof(*fpl), GFP_KERNEL); |
9591 | if (!fpl) | |
9592 | return -ENOMEM; | |
65e19f54 | 9593 | |
73b25d3b PB |
9594 | skb = alloc_skb(0, GFP_KERNEL); |
9595 | if (!skb) { | |
9596 | kfree(fpl); | |
9597 | return -ENOMEM; | |
9598 | } | |
6b06314c | 9599 | |
73b25d3b | 9600 | fpl->user = get_uid(current_user()); |
08a45173 | 9601 | fpl->max = SCM_MAX_FD; |
73b25d3b | 9602 | fpl->count = 0; |
dca58c6a | 9603 | |
08a45173 | 9604 | UNIXCB(skb).fp = fpl; |
73b25d3b | 9605 | skb->sk = sk; |
05f3fb3c | 9606 | skb->destructor = unix_destruct_scm; |
08a45173 | 9607 | refcount_add(skb->truesize, &sk->sk_wmem_alloc); |
6b06314c JA |
9608 | } |
9609 | ||
73b25d3b PB |
9610 | fpl = UNIXCB(skb).fp; |
9611 | fpl->fp[fpl->count++] = get_file(file); | |
9612 | unix_inflight(fpl->user, file); | |
9613 | skb_queue_head(head, skb); | |
dca58c6a | 9614 | fput(file); |
73b25d3b | 9615 | #endif |
6b06314c JA |
9616 | return 0; |
9617 | } | |
6b06314c | 9618 | |
47e90392 | 9619 | static void io_rsrc_file_put(struct io_ring_ctx *ctx, struct io_rsrc_put *prsrc) |
05f3fb3c | 9620 | { |
50238531 | 9621 | struct file *file = prsrc->file; |
05f3fb3c JA |
9622 | #if defined(CONFIG_UNIX) |
9623 | struct sock *sock = ctx->ring_sock->sk; | |
9624 | struct sk_buff_head list, *head = &sock->sk_receive_queue; | |
9625 | struct sk_buff *skb; | |
9626 | int i; | |
9627 | ||
1f59bc0f PB |
9628 | if (!io_file_need_scm(file)) { |
9629 | fput(file); | |
9630 | return; | |
9631 | } | |
9632 | ||
05f3fb3c JA |
9633 | __skb_queue_head_init(&list); |
9634 | ||
9635 | /* | |
9636 | * Find the skb that holds this file in its SCM_RIGHTS. When found, | |
9637 | * remove this entry and rearrange the file array. | |
9638 | */ | |
9639 | skb = skb_dequeue(head); | |
9640 | while (skb) { | |
9641 | struct scm_fp_list *fp; | |
9642 | ||
9643 | fp = UNIXCB(skb).fp; | |
9644 | for (i = 0; i < fp->count; i++) { | |
9645 | int left; | |
9646 | ||
9647 | if (fp->fp[i] != file) | |
9648 | continue; | |
9649 | ||
9650 | unix_notinflight(fp->user, fp->fp[i]); | |
9651 | left = fp->count - 1 - i; | |
9652 | if (left) { | |
9653 | memmove(&fp->fp[i], &fp->fp[i + 1], | |
9654 | left * sizeof(struct file *)); | |
9655 | } | |
9656 | fp->count--; | |
9657 | if (!fp->count) { | |
9658 | kfree_skb(skb); | |
9659 | skb = NULL; | |
9660 | } else { | |
9661 | __skb_queue_tail(&list, skb); | |
9662 | } | |
9663 | fput(file); | |
9664 | file = NULL; | |
9665 | break; | |
9666 | } | |
9667 | ||
9668 | if (!file) | |
9669 | break; | |
9670 | ||
9671 | __skb_queue_tail(&list, skb); | |
9672 | ||
9673 | skb = skb_dequeue(head); | |
9674 | } | |
9675 | ||
9676 | if (skb_peek(&list)) { | |
9677 | spin_lock_irq(&head->lock); | |
9678 | while ((skb = __skb_dequeue(&list)) != NULL) | |
9679 | __skb_queue_tail(head, skb); | |
9680 | spin_unlock_irq(&head->lock); | |
9681 | } | |
9682 | #else | |
9683 | fput(file); | |
9684 | #endif | |
9685 | } | |
9686 | ||
b895c9a6 | 9687 | static void __io_rsrc_put_work(struct io_rsrc_node *ref_node) |
65e19f54 | 9688 | { |
b895c9a6 | 9689 | struct io_rsrc_data *rsrc_data = ref_node->rsrc_data; |
269bbe5f BM |
9690 | struct io_ring_ctx *ctx = rsrc_data->ctx; |
9691 | struct io_rsrc_put *prsrc, *tmp; | |
05589553 | 9692 | |
269bbe5f BM |
9693 | list_for_each_entry_safe(prsrc, tmp, &ref_node->rsrc_list, list) { |
9694 | list_del(&prsrc->list); | |
b60c8dce PB |
9695 | |
9696 | if (prsrc->tag) { | |
f8929630 PB |
9697 | if (ctx->flags & IORING_SETUP_IOPOLL) |
9698 | mutex_lock(&ctx->uring_lock); | |
b60c8dce | 9699 | |
79ebeaee | 9700 | spin_lock(&ctx->completion_lock); |
913a571a | 9701 | io_fill_cqe_aux(ctx, prsrc->tag, 0, 0); |
b60c8dce | 9702 | io_commit_cqring(ctx); |
79ebeaee | 9703 | spin_unlock(&ctx->completion_lock); |
b60c8dce | 9704 | io_cqring_ev_posted(ctx); |
f8929630 PB |
9705 | |
9706 | if (ctx->flags & IORING_SETUP_IOPOLL) | |
9707 | mutex_unlock(&ctx->uring_lock); | |
b60c8dce PB |
9708 | } |
9709 | ||
40ae0ff7 | 9710 | rsrc_data->do_put(ctx, prsrc); |
269bbe5f | 9711 | kfree(prsrc); |
65e19f54 | 9712 | } |
05589553 | 9713 | |
28a9fe25 | 9714 | io_rsrc_node_destroy(ref_node); |
3e942498 PB |
9715 | if (atomic_dec_and_test(&rsrc_data->refs)) |
9716 | complete(&rsrc_data->done); | |
2faf852d | 9717 | } |
65e19f54 | 9718 | |
269bbe5f | 9719 | static void io_rsrc_put_work(struct work_struct *work) |
4a38aed2 JA |
9720 | { |
9721 | struct io_ring_ctx *ctx; | |
9722 | struct llist_node *node; | |
9723 | ||
269bbe5f BM |
9724 | ctx = container_of(work, struct io_ring_ctx, rsrc_put_work.work); |
9725 | node = llist_del_all(&ctx->rsrc_put_llist); | |
4a38aed2 JA |
9726 | |
9727 | while (node) { | |
b895c9a6 | 9728 | struct io_rsrc_node *ref_node; |
4a38aed2 JA |
9729 | struct llist_node *next = node->next; |
9730 | ||
b895c9a6 | 9731 | ref_node = llist_entry(node, struct io_rsrc_node, llist); |
269bbe5f | 9732 | __io_rsrc_put_work(ref_node); |
4a38aed2 JA |
9733 | node = next; |
9734 | } | |
9735 | } | |
9736 | ||
6b06314c | 9737 | static int io_sqe_files_register(struct io_ring_ctx *ctx, void __user *arg, |
792e3582 | 9738 | unsigned nr_args, u64 __user *tags) |
6b06314c JA |
9739 | { |
9740 | __s32 __user *fds = (__s32 __user *) arg; | |
05f3fb3c | 9741 | struct file *file; |
f3baed39 | 9742 | int fd, ret; |
846a4ef2 | 9743 | unsigned i; |
6b06314c | 9744 | |
05f3fb3c | 9745 | if (ctx->file_data) |
6b06314c JA |
9746 | return -EBUSY; |
9747 | if (!nr_args) | |
9748 | return -EINVAL; | |
9749 | if (nr_args > IORING_MAX_FIXED_FILES) | |
9750 | return -EMFILE; | |
3a1b8a4e PB |
9751 | if (nr_args > rlimit(RLIMIT_NOFILE)) |
9752 | return -EMFILE; | |
a7f0ed5a | 9753 | ret = io_rsrc_node_switch_start(ctx); |
f3baed39 PB |
9754 | if (ret) |
9755 | return ret; | |
d878c816 PB |
9756 | ret = io_rsrc_data_alloc(ctx, io_rsrc_file_put, tags, nr_args, |
9757 | &ctx->file_data); | |
9758 | if (ret) | |
9759 | return ret; | |
6b06314c | 9760 | |
a03a2a20 PB |
9761 | if (!io_alloc_file_tables(&ctx->file_table, nr_args)) { |
9762 | io_rsrc_data_free(ctx->file_data); | |
9763 | ctx->file_data = NULL; | |
9764 | return -ENOMEM; | |
9765 | } | |
65e19f54 | 9766 | |
08a45173 | 9767 | for (i = 0; i < nr_args; i++, ctx->nr_user_files++) { |
a03a2a20 PB |
9768 | struct io_fixed_file *file_slot; |
9769 | ||
d878c816 | 9770 | if (copy_from_user(&fd, &fds[i], sizeof(fd))) { |
600cf3f8 | 9771 | ret = -EFAULT; |
a03a2a20 | 9772 | goto fail; |
600cf3f8 | 9773 | } |
08a45173 | 9774 | /* allow sparse sets */ |
792e3582 PB |
9775 | if (fd == -1) { |
9776 | ret = -EINVAL; | |
2d091d62 | 9777 | if (unlikely(*io_get_tag_slot(ctx->file_data, i))) |
a03a2a20 | 9778 | goto fail; |
08a45173 | 9779 | continue; |
792e3582 | 9780 | } |
6b06314c | 9781 | |
05f3fb3c | 9782 | file = fget(fd); |
6b06314c | 9783 | ret = -EBADF; |
792e3582 | 9784 | if (unlikely(!file)) |
a03a2a20 | 9785 | goto fail; |
05f3fb3c | 9786 | |
6b06314c JA |
9787 | /* |
9788 | * Don't allow io_uring instances to be registered. If UNIX | |
9789 | * isn't enabled, then this causes a reference cycle and this | |
9790 | * instance can never get freed. If UNIX is enabled we'll | |
9791 | * handle it just fine, but there's still no point in allowing | |
9792 | * a ring fd as it doesn't support regular read/write anyway. | |
9793 | */ | |
05f3fb3c JA |
9794 | if (file->f_op == &io_uring_fops) { |
9795 | fput(file); | |
a03a2a20 | 9796 | goto fail; |
6b06314c | 9797 | } |
8b3171bd | 9798 | ret = io_scm_file_account(ctx, file); |
a03a2a20 | 9799 | if (ret) { |
600cf3f8 | 9800 | fput(file); |
a03a2a20 | 9801 | goto fail; |
c3a31e60 | 9802 | } |
e390510a PB |
9803 | file_slot = io_fixed_file_slot(&ctx->file_table, i); |
9804 | io_fixed_file_set(file_slot, file); | |
c3a31e60 JA |
9805 | } |
9806 | ||
a7f0ed5a | 9807 | io_rsrc_node_switch(ctx, NULL); |
c3a31e60 | 9808 | return 0; |
a03a2a20 PB |
9809 | fail: |
9810 | __io_sqe_files_unregister(ctx); | |
6b06314c | 9811 | return ret; |
c3a31e60 JA |
9812 | } |
9813 | ||
9c7b0ba8 PB |
9814 | static int io_queue_rsrc_removal(struct io_rsrc_data *data, unsigned idx, |
9815 | struct io_rsrc_node *node, void *rsrc) | |
9816 | { | |
8f0a2480 | 9817 | u64 *tag_slot = io_get_tag_slot(data, idx); |
9c7b0ba8 PB |
9818 | struct io_rsrc_put *prsrc; |
9819 | ||
9820 | prsrc = kzalloc(sizeof(*prsrc), GFP_KERNEL); | |
9821 | if (!prsrc) | |
9822 | return -ENOMEM; | |
9823 | ||
8f0a2480 PB |
9824 | prsrc->tag = *tag_slot; |
9825 | *tag_slot = 0; | |
9c7b0ba8 PB |
9826 | prsrc->rsrc = rsrc; |
9827 | list_add(&prsrc->list, &node->rsrc_list); | |
9828 | return 0; | |
9829 | } | |
9830 | ||
b9445598 PB |
9831 | static int io_install_fixed_file(struct io_kiocb *req, struct file *file, |
9832 | unsigned int issue_flags, u32 slot_index) | |
9833 | { | |
9834 | struct io_ring_ctx *ctx = req->ctx; | |
9c7b0ba8 | 9835 | bool needs_switch = false; |
b9445598 PB |
9836 | struct io_fixed_file *file_slot; |
9837 | int ret = -EBADF; | |
9838 | ||
f8929630 | 9839 | io_ring_submit_lock(ctx, issue_flags); |
b9445598 PB |
9840 | if (file->f_op == &io_uring_fops) |
9841 | goto err; | |
9842 | ret = -ENXIO; | |
9843 | if (!ctx->file_data) | |
9844 | goto err; | |
9845 | ret = -EINVAL; | |
9846 | if (slot_index >= ctx->nr_user_files) | |
9847 | goto err; | |
9848 | ||
9849 | slot_index = array_index_nospec(slot_index, ctx->nr_user_files); | |
9850 | file_slot = io_fixed_file_slot(&ctx->file_table, slot_index); | |
9c7b0ba8 PB |
9851 | |
9852 | if (file_slot->file_ptr) { | |
9853 | struct file *old_file; | |
9854 | ||
9855 | ret = io_rsrc_node_switch_start(ctx); | |
9856 | if (ret) | |
9857 | goto err; | |
9858 | ||
9859 | old_file = (struct file *)(file_slot->file_ptr & FFS_MASK); | |
9860 | ret = io_queue_rsrc_removal(ctx->file_data, slot_index, | |
9861 | ctx->rsrc_node, old_file); | |
9862 | if (ret) | |
9863 | goto err; | |
9864 | file_slot->file_ptr = 0; | |
9865 | needs_switch = true; | |
9866 | } | |
b9445598 | 9867 | |
8b3171bd | 9868 | ret = io_scm_file_account(ctx, file); |
e390510a PB |
9869 | if (!ret) { |
9870 | *io_get_tag_slot(ctx->file_data, slot_index) = 0; | |
9871 | io_fixed_file_set(file_slot, file); | |
b9445598 | 9872 | } |
b9445598 | 9873 | err: |
9c7b0ba8 PB |
9874 | if (needs_switch) |
9875 | io_rsrc_node_switch(ctx, ctx->file_data); | |
f8929630 | 9876 | io_ring_submit_unlock(ctx, issue_flags); |
b9445598 PB |
9877 | if (ret) |
9878 | fput(file); | |
9879 | return ret; | |
9880 | } | |
9881 | ||
7df778be PB |
9882 | static int io_close_fixed(struct io_kiocb *req, unsigned int issue_flags) |
9883 | { | |
9884 | unsigned int offset = req->close.file_slot - 1; | |
9885 | struct io_ring_ctx *ctx = req->ctx; | |
9886 | struct io_fixed_file *file_slot; | |
9887 | struct file *file; | |
4cdd158b | 9888 | int ret; |
7df778be | 9889 | |
f8929630 | 9890 | io_ring_submit_lock(ctx, issue_flags); |
7df778be PB |
9891 | ret = -ENXIO; |
9892 | if (unlikely(!ctx->file_data)) | |
9893 | goto out; | |
9894 | ret = -EINVAL; | |
9895 | if (offset >= ctx->nr_user_files) | |
9896 | goto out; | |
9897 | ret = io_rsrc_node_switch_start(ctx); | |
9898 | if (ret) | |
9899 | goto out; | |
9900 | ||
4cdd158b PB |
9901 | offset = array_index_nospec(offset, ctx->nr_user_files); |
9902 | file_slot = io_fixed_file_slot(&ctx->file_table, offset); | |
7df778be PB |
9903 | ret = -EBADF; |
9904 | if (!file_slot->file_ptr) | |
9905 | goto out; | |
9906 | ||
9907 | file = (struct file *)(file_slot->file_ptr & FFS_MASK); | |
9908 | ret = io_queue_rsrc_removal(ctx->file_data, offset, ctx->rsrc_node, file); | |
9909 | if (ret) | |
9910 | goto out; | |
9911 | ||
9912 | file_slot->file_ptr = 0; | |
9913 | io_rsrc_node_switch(ctx, ctx->file_data); | |
9914 | ret = 0; | |
9915 | out: | |
f8929630 | 9916 | io_ring_submit_unlock(ctx, issue_flags); |
7df778be PB |
9917 | return ret; |
9918 | } | |
9919 | ||
05f3fb3c | 9920 | static int __io_sqe_files_update(struct io_ring_ctx *ctx, |
c3bdad02 | 9921 | struct io_uring_rsrc_update2 *up, |
05f3fb3c JA |
9922 | unsigned nr_args) |
9923 | { | |
c3bdad02 | 9924 | u64 __user *tags = u64_to_user_ptr(up->tags); |
98f0b3b4 | 9925 | __s32 __user *fds = u64_to_user_ptr(up->data); |
b895c9a6 | 9926 | struct io_rsrc_data *data = ctx->file_data; |
a04b0ac0 PB |
9927 | struct io_fixed_file *file_slot; |
9928 | struct file *file; | |
98f0b3b4 PB |
9929 | int fd, i, err = 0; |
9930 | unsigned int done; | |
05589553 | 9931 | bool needs_switch = false; |
c3a31e60 | 9932 | |
98f0b3b4 PB |
9933 | if (!ctx->file_data) |
9934 | return -ENXIO; | |
9935 | if (up->offset + nr_args > ctx->nr_user_files) | |
c3a31e60 JA |
9936 | return -EINVAL; |
9937 | ||
67973b93 | 9938 | for (done = 0; done < nr_args; done++) { |
c3bdad02 PB |
9939 | u64 tag = 0; |
9940 | ||
9941 | if ((tags && copy_from_user(&tag, &tags[done], sizeof(tag))) || | |
9942 | copy_from_user(&fd, &fds[done], sizeof(fd))) { | |
c3a31e60 JA |
9943 | err = -EFAULT; |
9944 | break; | |
9945 | } | |
c3bdad02 PB |
9946 | if ((fd == IORING_REGISTER_FILES_SKIP || fd == -1) && tag) { |
9947 | err = -EINVAL; | |
9948 | break; | |
9949 | } | |
4e0377a1 | 9950 | if (fd == IORING_REGISTER_FILES_SKIP) |
9951 | continue; | |
9952 | ||
67973b93 | 9953 | i = array_index_nospec(up->offset + done, ctx->nr_user_files); |
aeca241b | 9954 | file_slot = io_fixed_file_slot(&ctx->file_table, i); |
ea64ec02 | 9955 | |
a04b0ac0 PB |
9956 | if (file_slot->file_ptr) { |
9957 | file = (struct file *)(file_slot->file_ptr & FFS_MASK); | |
4cdd158b | 9958 | err = io_queue_rsrc_removal(data, i, ctx->rsrc_node, file); |
a5318d3c HD |
9959 | if (err) |
9960 | break; | |
a04b0ac0 | 9961 | file_slot->file_ptr = 0; |
05589553 | 9962 | needs_switch = true; |
c3a31e60 JA |
9963 | } |
9964 | if (fd != -1) { | |
c3a31e60 JA |
9965 | file = fget(fd); |
9966 | if (!file) { | |
9967 | err = -EBADF; | |
9968 | break; | |
9969 | } | |
9970 | /* | |
9971 | * Don't allow io_uring instances to be registered. If | |
9972 | * UNIX isn't enabled, then this causes a reference | |
9973 | * cycle and this instance can never get freed. If UNIX | |
9974 | * is enabled we'll handle it just fine, but there's | |
9975 | * still no point in allowing a ring fd as it doesn't | |
9976 | * support regular read/write anyway. | |
9977 | */ | |
9978 | if (file->f_op == &io_uring_fops) { | |
9979 | fput(file); | |
9980 | err = -EBADF; | |
9981 | break; | |
9982 | } | |
8b3171bd | 9983 | err = io_scm_file_account(ctx, file); |
f3bd9dae YY |
9984 | if (err) { |
9985 | fput(file); | |
c3a31e60 | 9986 | break; |
f3bd9dae | 9987 | } |
e390510a PB |
9988 | *io_get_tag_slot(data, i) = tag; |
9989 | io_fixed_file_set(file_slot, file); | |
c3a31e60 | 9990 | } |
05f3fb3c JA |
9991 | } |
9992 | ||
a7f0ed5a PB |
9993 | if (needs_switch) |
9994 | io_rsrc_node_switch(ctx, data); | |
c3a31e60 JA |
9995 | return done ? done : err; |
9996 | } | |
05589553 | 9997 | |
685fe7fe JA |
9998 | static struct io_wq *io_init_wq_offload(struct io_ring_ctx *ctx, |
9999 | struct task_struct *task) | |
24369c2e | 10000 | { |
e941894e | 10001 | struct io_wq_hash *hash; |
24369c2e | 10002 | struct io_wq_data data; |
24369c2e | 10003 | unsigned int concurrency; |
24369c2e | 10004 | |
362a9e65 | 10005 | mutex_lock(&ctx->uring_lock); |
e941894e JA |
10006 | hash = ctx->hash_map; |
10007 | if (!hash) { | |
10008 | hash = kzalloc(sizeof(*hash), GFP_KERNEL); | |
362a9e65 YY |
10009 | if (!hash) { |
10010 | mutex_unlock(&ctx->uring_lock); | |
e941894e | 10011 | return ERR_PTR(-ENOMEM); |
362a9e65 | 10012 | } |
e941894e JA |
10013 | refcount_set(&hash->refs, 1); |
10014 | init_waitqueue_head(&hash->wait); | |
10015 | ctx->hash_map = hash; | |
24369c2e | 10016 | } |
362a9e65 | 10017 | mutex_unlock(&ctx->uring_lock); |
24369c2e | 10018 | |
e941894e | 10019 | data.hash = hash; |
685fe7fe | 10020 | data.task = task; |
ebc11b6c | 10021 | data.free_work = io_wq_free_work; |
f5fa38c5 | 10022 | data.do_work = io_wq_submit_work; |
24369c2e | 10023 | |
d25e3a3d JA |
10024 | /* Do QD, or 4 * CPUS, whatever is smallest */ |
10025 | concurrency = min(ctx->sq_entries, 4 * num_online_cpus()); | |
24369c2e | 10026 | |
5aa75ed5 | 10027 | return io_wq_create(concurrency, &data); |
24369c2e PB |
10028 | } |
10029 | ||
c072481d PB |
10030 | static __cold int io_uring_alloc_task_context(struct task_struct *task, |
10031 | struct io_ring_ctx *ctx) | |
0f212204 JA |
10032 | { |
10033 | struct io_uring_task *tctx; | |
d8a6df10 | 10034 | int ret; |
0f212204 | 10035 | |
09899b19 | 10036 | tctx = kzalloc(sizeof(*tctx), GFP_KERNEL); |
0f212204 JA |
10037 | if (unlikely(!tctx)) |
10038 | return -ENOMEM; | |
10039 | ||
e7a6c00d JA |
10040 | tctx->registered_rings = kcalloc(IO_RINGFD_REG_MAX, |
10041 | sizeof(struct file *), GFP_KERNEL); | |
10042 | if (unlikely(!tctx->registered_rings)) { | |
10043 | kfree(tctx); | |
10044 | return -ENOMEM; | |
10045 | } | |
10046 | ||
d8a6df10 JA |
10047 | ret = percpu_counter_init(&tctx->inflight, 0, GFP_KERNEL); |
10048 | if (unlikely(ret)) { | |
e7a6c00d | 10049 | kfree(tctx->registered_rings); |
d8a6df10 JA |
10050 | kfree(tctx); |
10051 | return ret; | |
10052 | } | |
10053 | ||
685fe7fe | 10054 | tctx->io_wq = io_init_wq_offload(ctx, task); |
5aa75ed5 JA |
10055 | if (IS_ERR(tctx->io_wq)) { |
10056 | ret = PTR_ERR(tctx->io_wq); | |
10057 | percpu_counter_destroy(&tctx->inflight); | |
e7a6c00d | 10058 | kfree(tctx->registered_rings); |
5aa75ed5 JA |
10059 | kfree(tctx); |
10060 | return ret; | |
10061 | } | |
10062 | ||
0f212204 JA |
10063 | xa_init(&tctx->xa); |
10064 | init_waitqueue_head(&tctx->wait); | |
fdaf083c | 10065 | atomic_set(&tctx->in_idle, 0); |
0f212204 | 10066 | task->io_uring = tctx; |
7cbf1722 JA |
10067 | spin_lock_init(&tctx->task_lock); |
10068 | INIT_WQ_LIST(&tctx->task_list); | |
4813c377 | 10069 | INIT_WQ_LIST(&tctx->prior_task_list); |
7cbf1722 | 10070 | init_task_work(&tctx->task_work, tctx_task_work); |
0f212204 JA |
10071 | return 0; |
10072 | } | |
10073 | ||
10074 | void __io_uring_free(struct task_struct *tsk) | |
10075 | { | |
10076 | struct io_uring_task *tctx = tsk->io_uring; | |
10077 | ||
10078 | WARN_ON_ONCE(!xa_empty(&tctx->xa)); | |
ef8eaa4e | 10079 | WARN_ON_ONCE(tctx->io_wq); |
09899b19 | 10080 | WARN_ON_ONCE(tctx->cached_refs); |
ef8eaa4e | 10081 | |
e7a6c00d | 10082 | kfree(tctx->registered_rings); |
d8a6df10 | 10083 | percpu_counter_destroy(&tctx->inflight); |
0f212204 JA |
10084 | kfree(tctx); |
10085 | tsk->io_uring = NULL; | |
10086 | } | |
10087 | ||
c072481d PB |
10088 | static __cold int io_sq_offload_create(struct io_ring_ctx *ctx, |
10089 | struct io_uring_params *p) | |
2b188cc1 JA |
10090 | { |
10091 | int ret; | |
10092 | ||
d25e3a3d JA |
10093 | /* Retain compatibility with failing for an invalid attach attempt */ |
10094 | if ((ctx->flags & (IORING_SETUP_ATTACH_WQ | IORING_SETUP_SQPOLL)) == | |
10095 | IORING_SETUP_ATTACH_WQ) { | |
10096 | struct fd f; | |
10097 | ||
10098 | f = fdget(p->wq_fd); | |
10099 | if (!f.file) | |
10100 | return -ENXIO; | |
0cc936f7 JA |
10101 | if (f.file->f_op != &io_uring_fops) { |
10102 | fdput(f); | |
f2a48dd0 | 10103 | return -EINVAL; |
0cc936f7 JA |
10104 | } |
10105 | fdput(f); | |
d25e3a3d | 10106 | } |
6c271ce2 | 10107 | if (ctx->flags & IORING_SETUP_SQPOLL) { |
46fe18b1 | 10108 | struct task_struct *tsk; |
534ca6d6 | 10109 | struct io_sq_data *sqd; |
26984fbf | 10110 | bool attached; |
534ca6d6 | 10111 | |
cdc1404a PM |
10112 | ret = security_uring_sqpoll(); |
10113 | if (ret) | |
10114 | return ret; | |
10115 | ||
26984fbf | 10116 | sqd = io_get_sq_data(p, &attached); |
534ca6d6 JA |
10117 | if (IS_ERR(sqd)) { |
10118 | ret = PTR_ERR(sqd); | |
10119 | goto err; | |
10120 | } | |
69fb2131 | 10121 | |
7c30f36a | 10122 | ctx->sq_creds = get_current_cred(); |
534ca6d6 | 10123 | ctx->sq_data = sqd; |
917257da JA |
10124 | ctx->sq_thread_idle = msecs_to_jiffies(p->sq_thread_idle); |
10125 | if (!ctx->sq_thread_idle) | |
10126 | ctx->sq_thread_idle = HZ; | |
10127 | ||
78d7f6ba | 10128 | io_sq_thread_park(sqd); |
de75a3d3 PB |
10129 | list_add(&ctx->sqd_list, &sqd->ctx_list); |
10130 | io_sqd_update_thread_idle(sqd); | |
26984fbf | 10131 | /* don't attach to a dying SQPOLL thread, would be racy */ |
f2a48dd0 | 10132 | ret = (attached && !sqd->thread) ? -ENXIO : 0; |
78d7f6ba PB |
10133 | io_sq_thread_unpark(sqd); |
10134 | ||
de75a3d3 PB |
10135 | if (ret < 0) |
10136 | goto err; | |
10137 | if (attached) | |
5aa75ed5 | 10138 | return 0; |
aa06165d | 10139 | |
6c271ce2 | 10140 | if (p->flags & IORING_SETUP_SQ_AFF) { |
44a9bd18 | 10141 | int cpu = p->sq_thread_cpu; |
6c271ce2 | 10142 | |
917257da | 10143 | ret = -EINVAL; |
f2a48dd0 | 10144 | if (cpu >= nr_cpu_ids || !cpu_online(cpu)) |
e8f98f24 | 10145 | goto err_sqpoll; |
37d1e2e3 | 10146 | sqd->sq_cpu = cpu; |
6c271ce2 | 10147 | } else { |
37d1e2e3 | 10148 | sqd->sq_cpu = -1; |
6c271ce2 | 10149 | } |
37d1e2e3 JA |
10150 | |
10151 | sqd->task_pid = current->pid; | |
5c2469e0 | 10152 | sqd->task_tgid = current->tgid; |
46fe18b1 JA |
10153 | tsk = create_io_thread(io_sq_thread, sqd, NUMA_NO_NODE); |
10154 | if (IS_ERR(tsk)) { | |
10155 | ret = PTR_ERR(tsk); | |
e8f98f24 | 10156 | goto err_sqpoll; |
6c271ce2 | 10157 | } |
97a73a0f | 10158 | |
46fe18b1 | 10159 | sqd->thread = tsk; |
97a73a0f | 10160 | ret = io_uring_alloc_task_context(tsk, ctx); |
46fe18b1 | 10161 | wake_up_new_task(tsk); |
0f212204 JA |
10162 | if (ret) |
10163 | goto err; | |
6c271ce2 JA |
10164 | } else if (p->flags & IORING_SETUP_SQ_AFF) { |
10165 | /* Can't have SQ_AFF without SQPOLL */ | |
10166 | ret = -EINVAL; | |
10167 | goto err; | |
10168 | } | |
10169 | ||
2b188cc1 | 10170 | return 0; |
f2a48dd0 PB |
10171 | err_sqpoll: |
10172 | complete(&ctx->sq_data->exited); | |
2b188cc1 | 10173 | err: |
37d1e2e3 | 10174 | io_sq_thread_finish(ctx); |
2b188cc1 JA |
10175 | return ret; |
10176 | } | |
10177 | ||
a087e2b5 BM |
10178 | static inline void __io_unaccount_mem(struct user_struct *user, |
10179 | unsigned long nr_pages) | |
2b188cc1 JA |
10180 | { |
10181 | atomic_long_sub(nr_pages, &user->locked_vm); | |
10182 | } | |
10183 | ||
a087e2b5 BM |
10184 | static inline int __io_account_mem(struct user_struct *user, |
10185 | unsigned long nr_pages) | |
2b188cc1 JA |
10186 | { |
10187 | unsigned long page_limit, cur_pages, new_pages; | |
10188 | ||
10189 | /* Don't allow more pages than we can safely lock */ | |
10190 | page_limit = rlimit(RLIMIT_MEMLOCK) >> PAGE_SHIFT; | |
10191 | ||
10192 | do { | |
10193 | cur_pages = atomic_long_read(&user->locked_vm); | |
10194 | new_pages = cur_pages + nr_pages; | |
10195 | if (new_pages > page_limit) | |
10196 | return -ENOMEM; | |
10197 | } while (atomic_long_cmpxchg(&user->locked_vm, cur_pages, | |
10198 | new_pages) != cur_pages); | |
10199 | ||
10200 | return 0; | |
10201 | } | |
10202 | ||
26bfa89e | 10203 | static void io_unaccount_mem(struct io_ring_ctx *ctx, unsigned long nr_pages) |
a087e2b5 | 10204 | { |
62e398be | 10205 | if (ctx->user) |
a087e2b5 | 10206 | __io_unaccount_mem(ctx->user, nr_pages); |
30975825 | 10207 | |
26bfa89e JA |
10208 | if (ctx->mm_account) |
10209 | atomic64_sub(nr_pages, &ctx->mm_account->pinned_vm); | |
a087e2b5 BM |
10210 | } |
10211 | ||
26bfa89e | 10212 | static int io_account_mem(struct io_ring_ctx *ctx, unsigned long nr_pages) |
a087e2b5 | 10213 | { |
30975825 BM |
10214 | int ret; |
10215 | ||
62e398be | 10216 | if (ctx->user) { |
30975825 BM |
10217 | ret = __io_account_mem(ctx->user, nr_pages); |
10218 | if (ret) | |
10219 | return ret; | |
10220 | } | |
10221 | ||
26bfa89e JA |
10222 | if (ctx->mm_account) |
10223 | atomic64_add(nr_pages, &ctx->mm_account->pinned_vm); | |
a087e2b5 BM |
10224 | |
10225 | return 0; | |
10226 | } | |
10227 | ||
2b188cc1 JA |
10228 | static void io_mem_free(void *ptr) |
10229 | { | |
52e04ef4 MR |
10230 | struct page *page; |
10231 | ||
10232 | if (!ptr) | |
10233 | return; | |
2b188cc1 | 10234 | |
52e04ef4 | 10235 | page = virt_to_head_page(ptr); |
2b188cc1 JA |
10236 | if (put_page_testzero(page)) |
10237 | free_compound_page(page); | |
10238 | } | |
10239 | ||
10240 | static void *io_mem_alloc(size_t size) | |
10241 | { | |
0a3f1e0b | 10242 | gfp_t gfp = GFP_KERNEL_ACCOUNT | __GFP_ZERO | __GFP_NOWARN | __GFP_COMP; |
2b188cc1 | 10243 | |
0a3f1e0b | 10244 | return (void *) __get_free_pages(gfp, get_order(size)); |
2b188cc1 JA |
10245 | } |
10246 | ||
baf9cb64 SR |
10247 | static unsigned long rings_size(struct io_ring_ctx *ctx, unsigned int sq_entries, |
10248 | unsigned int cq_entries, size_t *sq_offset) | |
75b28aff HV |
10249 | { |
10250 | struct io_rings *rings; | |
10251 | size_t off, sq_array_size; | |
10252 | ||
10253 | off = struct_size(rings, cqes, cq_entries); | |
10254 | if (off == SIZE_MAX) | |
10255 | return SIZE_MAX; | |
baf9cb64 SR |
10256 | if (ctx->flags & IORING_SETUP_CQE32) { |
10257 | if (check_shl_overflow(off, 1, &off)) | |
10258 | return SIZE_MAX; | |
10259 | } | |
75b28aff HV |
10260 | |
10261 | #ifdef CONFIG_SMP | |
10262 | off = ALIGN(off, SMP_CACHE_BYTES); | |
10263 | if (off == 0) | |
10264 | return SIZE_MAX; | |
10265 | #endif | |
10266 | ||
b36200f5 DV |
10267 | if (sq_offset) |
10268 | *sq_offset = off; | |
10269 | ||
75b28aff HV |
10270 | sq_array_size = array_size(sizeof(u32), sq_entries); |
10271 | if (sq_array_size == SIZE_MAX) | |
10272 | return SIZE_MAX; | |
10273 | ||
10274 | if (check_add_overflow(off, sq_array_size, &off)) | |
10275 | return SIZE_MAX; | |
10276 | ||
75b28aff HV |
10277 | return off; |
10278 | } | |
10279 | ||
41edf1a5 | 10280 | static void io_buffer_unmap(struct io_ring_ctx *ctx, struct io_mapped_ubuf **slot) |
7f61a1e9 | 10281 | { |
41edf1a5 | 10282 | struct io_mapped_ubuf *imu = *slot; |
7f61a1e9 PB |
10283 | unsigned int i; |
10284 | ||
6224843d PB |
10285 | if (imu != ctx->dummy_ubuf) { |
10286 | for (i = 0; i < imu->nr_bvecs; i++) | |
10287 | unpin_user_page(imu->bvec[i].bv_page); | |
10288 | if (imu->acct_pages) | |
10289 | io_unaccount_mem(ctx, imu->acct_pages); | |
10290 | kvfree(imu); | |
10291 | } | |
41edf1a5 | 10292 | *slot = NULL; |
7f61a1e9 PB |
10293 | } |
10294 | ||
bd54b6fe | 10295 | static void io_rsrc_buf_put(struct io_ring_ctx *ctx, struct io_rsrc_put *prsrc) |
edafccee | 10296 | { |
634d00df PB |
10297 | io_buffer_unmap(ctx, &prsrc->buf); |
10298 | prsrc->buf = NULL; | |
bd54b6fe | 10299 | } |
edafccee | 10300 | |
bd54b6fe BM |
10301 | static void __io_sqe_buffers_unregister(struct io_ring_ctx *ctx) |
10302 | { | |
10303 | unsigned int i; | |
edafccee | 10304 | |
7f61a1e9 PB |
10305 | for (i = 0; i < ctx->nr_user_bufs; i++) |
10306 | io_buffer_unmap(ctx, &ctx->user_bufs[i]); | |
edafccee | 10307 | kfree(ctx->user_bufs); |
bb6659cc | 10308 | io_rsrc_data_free(ctx->buf_data); |
edafccee | 10309 | ctx->user_bufs = NULL; |
bd54b6fe | 10310 | ctx->buf_data = NULL; |
edafccee | 10311 | ctx->nr_user_bufs = 0; |
bd54b6fe BM |
10312 | } |
10313 | ||
0a96bbe4 | 10314 | static int io_sqe_buffers_unregister(struct io_ring_ctx *ctx) |
edafccee | 10315 | { |
bd54b6fe | 10316 | int ret; |
edafccee | 10317 | |
bd54b6fe | 10318 | if (!ctx->buf_data) |
edafccee JA |
10319 | return -ENXIO; |
10320 | ||
bd54b6fe BM |
10321 | ret = io_rsrc_ref_quiesce(ctx->buf_data, ctx); |
10322 | if (!ret) | |
10323 | __io_sqe_buffers_unregister(ctx); | |
10324 | return ret; | |
edafccee JA |
10325 | } |
10326 | ||
10327 | static int io_copy_iov(struct io_ring_ctx *ctx, struct iovec *dst, | |
10328 | void __user *arg, unsigned index) | |
10329 | { | |
10330 | struct iovec __user *src; | |
10331 | ||
10332 | #ifdef CONFIG_COMPAT | |
10333 | if (ctx->compat) { | |
10334 | struct compat_iovec __user *ciovs; | |
10335 | struct compat_iovec ciov; | |
10336 | ||
10337 | ciovs = (struct compat_iovec __user *) arg; | |
10338 | if (copy_from_user(&ciov, &ciovs[index], sizeof(ciov))) | |
10339 | return -EFAULT; | |
10340 | ||
d55e5f5b | 10341 | dst->iov_base = u64_to_user_ptr((u64)ciov.iov_base); |
edafccee JA |
10342 | dst->iov_len = ciov.iov_len; |
10343 | return 0; | |
10344 | } | |
10345 | #endif | |
10346 | src = (struct iovec __user *) arg; | |
10347 | if (copy_from_user(dst, &src[index], sizeof(*dst))) | |
10348 | return -EFAULT; | |
10349 | return 0; | |
10350 | } | |
10351 | ||
de293938 JA |
10352 | /* |
10353 | * Not super efficient, but this is just a registration time. And we do cache | |
10354 | * the last compound head, so generally we'll only do a full search if we don't | |
10355 | * match that one. | |
10356 | * | |
10357 | * We check if the given compound head page has already been accounted, to | |
10358 | * avoid double accounting it. This allows us to account the full size of the | |
10359 | * page, not just the constituent pages of a huge page. | |
10360 | */ | |
10361 | static bool headpage_already_acct(struct io_ring_ctx *ctx, struct page **pages, | |
10362 | int nr_pages, struct page *hpage) | |
10363 | { | |
10364 | int i, j; | |
10365 | ||
10366 | /* check current page array */ | |
10367 | for (i = 0; i < nr_pages; i++) { | |
10368 | if (!PageCompound(pages[i])) | |
10369 | continue; | |
10370 | if (compound_head(pages[i]) == hpage) | |
10371 | return true; | |
10372 | } | |
10373 | ||
10374 | /* check previously registered pages */ | |
10375 | for (i = 0; i < ctx->nr_user_bufs; i++) { | |
41edf1a5 | 10376 | struct io_mapped_ubuf *imu = ctx->user_bufs[i]; |
de293938 JA |
10377 | |
10378 | for (j = 0; j < imu->nr_bvecs; j++) { | |
10379 | if (!PageCompound(imu->bvec[j].bv_page)) | |
10380 | continue; | |
10381 | if (compound_head(imu->bvec[j].bv_page) == hpage) | |
10382 | return true; | |
10383 | } | |
10384 | } | |
10385 | ||
10386 | return false; | |
10387 | } | |
10388 | ||
10389 | static int io_buffer_account_pin(struct io_ring_ctx *ctx, struct page **pages, | |
10390 | int nr_pages, struct io_mapped_ubuf *imu, | |
10391 | struct page **last_hpage) | |
10392 | { | |
10393 | int i, ret; | |
10394 | ||
216e5835 | 10395 | imu->acct_pages = 0; |
de293938 JA |
10396 | for (i = 0; i < nr_pages; i++) { |
10397 | if (!PageCompound(pages[i])) { | |
10398 | imu->acct_pages++; | |
10399 | } else { | |
10400 | struct page *hpage; | |
10401 | ||
10402 | hpage = compound_head(pages[i]); | |
10403 | if (hpage == *last_hpage) | |
10404 | continue; | |
10405 | *last_hpage = hpage; | |
10406 | if (headpage_already_acct(ctx, pages, i, hpage)) | |
10407 | continue; | |
10408 | imu->acct_pages += page_size(hpage) >> PAGE_SHIFT; | |
10409 | } | |
10410 | } | |
10411 | ||
10412 | if (!imu->acct_pages) | |
10413 | return 0; | |
10414 | ||
26bfa89e | 10415 | ret = io_account_mem(ctx, imu->acct_pages); |
de293938 JA |
10416 | if (ret) |
10417 | imu->acct_pages = 0; | |
10418 | return ret; | |
10419 | } | |
10420 | ||
0a96bbe4 | 10421 | static int io_sqe_buffer_register(struct io_ring_ctx *ctx, struct iovec *iov, |
41edf1a5 | 10422 | struct io_mapped_ubuf **pimu, |
0a96bbe4 | 10423 | struct page **last_hpage) |
edafccee | 10424 | { |
41edf1a5 | 10425 | struct io_mapped_ubuf *imu = NULL; |
edafccee JA |
10426 | struct vm_area_struct **vmas = NULL; |
10427 | struct page **pages = NULL; | |
0a96bbe4 BM |
10428 | unsigned long off, start, end, ubuf; |
10429 | size_t size; | |
10430 | int ret, pret, nr_pages, i; | |
10431 | ||
6224843d PB |
10432 | if (!iov->iov_base) { |
10433 | *pimu = ctx->dummy_ubuf; | |
10434 | return 0; | |
10435 | } | |
10436 | ||
0a96bbe4 BM |
10437 | ubuf = (unsigned long) iov->iov_base; |
10438 | end = (ubuf + iov->iov_len + PAGE_SIZE - 1) >> PAGE_SHIFT; | |
10439 | start = ubuf >> PAGE_SHIFT; | |
10440 | nr_pages = end - start; | |
10441 | ||
41edf1a5 | 10442 | *pimu = NULL; |
0a96bbe4 BM |
10443 | ret = -ENOMEM; |
10444 | ||
10445 | pages = kvmalloc_array(nr_pages, sizeof(struct page *), GFP_KERNEL); | |
10446 | if (!pages) | |
10447 | goto done; | |
10448 | ||
10449 | vmas = kvmalloc_array(nr_pages, sizeof(struct vm_area_struct *), | |
10450 | GFP_KERNEL); | |
10451 | if (!vmas) | |
10452 | goto done; | |
edafccee | 10453 | |
41edf1a5 | 10454 | imu = kvmalloc(struct_size(imu, bvec, nr_pages), GFP_KERNEL); |
a2b4198c | 10455 | if (!imu) |
0a96bbe4 BM |
10456 | goto done; |
10457 | ||
10458 | ret = 0; | |
10459 | mmap_read_lock(current->mm); | |
10460 | pret = pin_user_pages(ubuf, nr_pages, FOLL_WRITE | FOLL_LONGTERM, | |
10461 | pages, vmas); | |
10462 | if (pret == nr_pages) { | |
10463 | /* don't support file backed memory */ | |
10464 | for (i = 0; i < nr_pages; i++) { | |
10465 | struct vm_area_struct *vma = vmas[i]; | |
10466 | ||
40dad765 PB |
10467 | if (vma_is_shmem(vma)) |
10468 | continue; | |
0a96bbe4 BM |
10469 | if (vma->vm_file && |
10470 | !is_file_hugepages(vma->vm_file)) { | |
10471 | ret = -EOPNOTSUPP; | |
10472 | break; | |
10473 | } | |
10474 | } | |
10475 | } else { | |
10476 | ret = pret < 0 ? pret : -EFAULT; | |
10477 | } | |
10478 | mmap_read_unlock(current->mm); | |
10479 | if (ret) { | |
10480 | /* | |
10481 | * if we did partial map, or found file backed vmas, | |
10482 | * release any pages we did get | |
10483 | */ | |
10484 | if (pret > 0) | |
10485 | unpin_user_pages(pages, pret); | |
0a96bbe4 BM |
10486 | goto done; |
10487 | } | |
10488 | ||
10489 | ret = io_buffer_account_pin(ctx, pages, pret, imu, last_hpage); | |
10490 | if (ret) { | |
10491 | unpin_user_pages(pages, pret); | |
0a96bbe4 BM |
10492 | goto done; |
10493 | } | |
10494 | ||
10495 | off = ubuf & ~PAGE_MASK; | |
10496 | size = iov->iov_len; | |
10497 | for (i = 0; i < nr_pages; i++) { | |
10498 | size_t vec_len; | |
10499 | ||
10500 | vec_len = min_t(size_t, size, PAGE_SIZE - off); | |
10501 | imu->bvec[i].bv_page = pages[i]; | |
10502 | imu->bvec[i].bv_len = vec_len; | |
10503 | imu->bvec[i].bv_offset = off; | |
10504 | off = 0; | |
10505 | size -= vec_len; | |
10506 | } | |
10507 | /* store original address for later verification */ | |
10508 | imu->ubuf = ubuf; | |
4751f53d | 10509 | imu->ubuf_end = ubuf + iov->iov_len; |
0a96bbe4 | 10510 | imu->nr_bvecs = nr_pages; |
41edf1a5 | 10511 | *pimu = imu; |
0a96bbe4 BM |
10512 | ret = 0; |
10513 | done: | |
41edf1a5 PB |
10514 | if (ret) |
10515 | kvfree(imu); | |
0a96bbe4 BM |
10516 | kvfree(pages); |
10517 | kvfree(vmas); | |
10518 | return ret; | |
10519 | } | |
10520 | ||
2b358604 | 10521 | static int io_buffers_map_alloc(struct io_ring_ctx *ctx, unsigned int nr_args) |
0a96bbe4 | 10522 | { |
87094465 PB |
10523 | ctx->user_bufs = kcalloc(nr_args, sizeof(*ctx->user_bufs), GFP_KERNEL); |
10524 | return ctx->user_bufs ? 0 : -ENOMEM; | |
2b358604 | 10525 | } |
edafccee | 10526 | |
2b358604 BM |
10527 | static int io_buffer_validate(struct iovec *iov) |
10528 | { | |
50e96989 PB |
10529 | unsigned long tmp, acct_len = iov->iov_len + (PAGE_SIZE - 1); |
10530 | ||
2b358604 BM |
10531 | /* |
10532 | * Don't impose further limits on the size and buffer | |
10533 | * constraints here, we'll -EINVAL later when IO is | |
10534 | * submitted if they are wrong. | |
10535 | */ | |
6224843d PB |
10536 | if (!iov->iov_base) |
10537 | return iov->iov_len ? -EFAULT : 0; | |
10538 | if (!iov->iov_len) | |
2b358604 | 10539 | return -EFAULT; |
edafccee | 10540 | |
2b358604 BM |
10541 | /* arbitrary limit, but we need something */ |
10542 | if (iov->iov_len > SZ_1G) | |
10543 | return -EFAULT; | |
edafccee | 10544 | |
50e96989 PB |
10545 | if (check_add_overflow((unsigned long)iov->iov_base, acct_len, &tmp)) |
10546 | return -EOVERFLOW; | |
10547 | ||
2b358604 BM |
10548 | return 0; |
10549 | } | |
edafccee | 10550 | |
2b358604 | 10551 | static int io_sqe_buffers_register(struct io_ring_ctx *ctx, void __user *arg, |
634d00df | 10552 | unsigned int nr_args, u64 __user *tags) |
2b358604 | 10553 | { |
bd54b6fe BM |
10554 | struct page *last_hpage = NULL; |
10555 | struct io_rsrc_data *data; | |
2b358604 BM |
10556 | int i, ret; |
10557 | struct iovec iov; | |
edafccee | 10558 | |
87094465 PB |
10559 | if (ctx->user_bufs) |
10560 | return -EBUSY; | |
489809e2 | 10561 | if (!nr_args || nr_args > IORING_MAX_REG_BUFFERS) |
87094465 | 10562 | return -EINVAL; |
bd54b6fe | 10563 | ret = io_rsrc_node_switch_start(ctx); |
2b358604 BM |
10564 | if (ret) |
10565 | return ret; | |
d878c816 PB |
10566 | ret = io_rsrc_data_alloc(ctx, io_rsrc_buf_put, tags, nr_args, &data); |
10567 | if (ret) | |
10568 | return ret; | |
bd54b6fe BM |
10569 | ret = io_buffers_map_alloc(ctx, nr_args); |
10570 | if (ret) { | |
bb6659cc | 10571 | io_rsrc_data_free(data); |
bd54b6fe BM |
10572 | return ret; |
10573 | } | |
edafccee | 10574 | |
87094465 | 10575 | for (i = 0; i < nr_args; i++, ctx->nr_user_bufs++) { |
edafccee JA |
10576 | ret = io_copy_iov(ctx, &iov, arg, i); |
10577 | if (ret) | |
0a96bbe4 | 10578 | break; |
2b358604 BM |
10579 | ret = io_buffer_validate(&iov); |
10580 | if (ret) | |
0a96bbe4 | 10581 | break; |
2d091d62 | 10582 | if (!iov.iov_base && *io_get_tag_slot(data, i)) { |
cf3770e7 CIK |
10583 | ret = -EINVAL; |
10584 | break; | |
10585 | } | |
edafccee | 10586 | |
41edf1a5 PB |
10587 | ret = io_sqe_buffer_register(ctx, &iov, &ctx->user_bufs[i], |
10588 | &last_hpage); | |
0a96bbe4 BM |
10589 | if (ret) |
10590 | break; | |
edafccee | 10591 | } |
0a96bbe4 | 10592 | |
bd54b6fe | 10593 | WARN_ON_ONCE(ctx->buf_data); |
0a96bbe4 | 10594 | |
bd54b6fe BM |
10595 | ctx->buf_data = data; |
10596 | if (ret) | |
10597 | __io_sqe_buffers_unregister(ctx); | |
10598 | else | |
10599 | io_rsrc_node_switch(ctx, NULL); | |
edafccee JA |
10600 | return ret; |
10601 | } | |
10602 | ||
634d00df PB |
10603 | static int __io_sqe_buffers_update(struct io_ring_ctx *ctx, |
10604 | struct io_uring_rsrc_update2 *up, | |
10605 | unsigned int nr_args) | |
10606 | { | |
10607 | u64 __user *tags = u64_to_user_ptr(up->tags); | |
10608 | struct iovec iov, __user *iovs = u64_to_user_ptr(up->data); | |
634d00df PB |
10609 | struct page *last_hpage = NULL; |
10610 | bool needs_switch = false; | |
10611 | __u32 done; | |
10612 | int i, err; | |
10613 | ||
10614 | if (!ctx->buf_data) | |
10615 | return -ENXIO; | |
10616 | if (up->offset + nr_args > ctx->nr_user_bufs) | |
10617 | return -EINVAL; | |
10618 | ||
10619 | for (done = 0; done < nr_args; done++) { | |
0b8c0e7c PB |
10620 | struct io_mapped_ubuf *imu; |
10621 | int offset = up->offset + done; | |
634d00df PB |
10622 | u64 tag = 0; |
10623 | ||
10624 | err = io_copy_iov(ctx, &iov, iovs, done); | |
10625 | if (err) | |
10626 | break; | |
10627 | if (tags && copy_from_user(&tag, &tags[done], sizeof(tag))) { | |
10628 | err = -EFAULT; | |
10629 | break; | |
10630 | } | |
0b8c0e7c PB |
10631 | err = io_buffer_validate(&iov); |
10632 | if (err) | |
10633 | break; | |
cf3770e7 CIK |
10634 | if (!iov.iov_base && tag) { |
10635 | err = -EINVAL; | |
10636 | break; | |
10637 | } | |
0b8c0e7c PB |
10638 | err = io_sqe_buffer_register(ctx, &iov, &imu, &last_hpage); |
10639 | if (err) | |
10640 | break; | |
634d00df | 10641 | |
0b8c0e7c | 10642 | i = array_index_nospec(offset, ctx->nr_user_bufs); |
6224843d | 10643 | if (ctx->user_bufs[i] != ctx->dummy_ubuf) { |
4cdd158b | 10644 | err = io_queue_rsrc_removal(ctx->buf_data, i, |
0b8c0e7c PB |
10645 | ctx->rsrc_node, ctx->user_bufs[i]); |
10646 | if (unlikely(err)) { | |
10647 | io_buffer_unmap(ctx, &imu); | |
634d00df | 10648 | break; |
0b8c0e7c | 10649 | } |
634d00df PB |
10650 | ctx->user_bufs[i] = NULL; |
10651 | needs_switch = true; | |
10652 | } | |
10653 | ||
0b8c0e7c | 10654 | ctx->user_bufs[i] = imu; |
2d091d62 | 10655 | *io_get_tag_slot(ctx->buf_data, offset) = tag; |
634d00df PB |
10656 | } |
10657 | ||
10658 | if (needs_switch) | |
10659 | io_rsrc_node_switch(ctx, ctx->buf_data); | |
10660 | return done ? done : err; | |
10661 | } | |
10662 | ||
c75312dd UA |
10663 | static int io_eventfd_register(struct io_ring_ctx *ctx, void __user *arg, |
10664 | unsigned int eventfd_async) | |
9b402849 | 10665 | { |
77bc59b4 | 10666 | struct io_ev_fd *ev_fd; |
9b402849 | 10667 | __s32 __user *fds = arg; |
f0a4e62b | 10668 | int fd; |
9b402849 | 10669 | |
77bc59b4 UA |
10670 | ev_fd = rcu_dereference_protected(ctx->io_ev_fd, |
10671 | lockdep_is_held(&ctx->uring_lock)); | |
10672 | if (ev_fd) | |
9b402849 JA |
10673 | return -EBUSY; |
10674 | ||
10675 | if (copy_from_user(&fd, fds, sizeof(*fds))) | |
10676 | return -EFAULT; | |
10677 | ||
77bc59b4 UA |
10678 | ev_fd = kmalloc(sizeof(*ev_fd), GFP_KERNEL); |
10679 | if (!ev_fd) | |
10680 | return -ENOMEM; | |
fe7e3257 | 10681 | |
77bc59b4 UA |
10682 | ev_fd->cq_ev_fd = eventfd_ctx_fdget(fd); |
10683 | if (IS_ERR(ev_fd->cq_ev_fd)) { | |
f0a4e62b | 10684 | int ret = PTR_ERR(ev_fd->cq_ev_fd); |
77bc59b4 | 10685 | kfree(ev_fd); |
9b402849 JA |
10686 | return ret; |
10687 | } | |
c75312dd | 10688 | ev_fd->eventfd_async = eventfd_async; |
9aa8dfde | 10689 | ctx->has_evfd = true; |
77bc59b4 | 10690 | rcu_assign_pointer(ctx->io_ev_fd, ev_fd); |
f0a4e62b | 10691 | return 0; |
77bc59b4 UA |
10692 | } |
10693 | ||
10694 | static void io_eventfd_put(struct rcu_head *rcu) | |
10695 | { | |
10696 | struct io_ev_fd *ev_fd = container_of(rcu, struct io_ev_fd, rcu); | |
10697 | ||
10698 | eventfd_ctx_put(ev_fd->cq_ev_fd); | |
10699 | kfree(ev_fd); | |
9b402849 JA |
10700 | } |
10701 | ||
10702 | static int io_eventfd_unregister(struct io_ring_ctx *ctx) | |
10703 | { | |
77bc59b4 UA |
10704 | struct io_ev_fd *ev_fd; |
10705 | ||
10706 | ev_fd = rcu_dereference_protected(ctx->io_ev_fd, | |
10707 | lockdep_is_held(&ctx->uring_lock)); | |
10708 | if (ev_fd) { | |
9aa8dfde | 10709 | ctx->has_evfd = false; |
77bc59b4 UA |
10710 | rcu_assign_pointer(ctx->io_ev_fd, NULL); |
10711 | call_rcu(&ev_fd->rcu, io_eventfd_put); | |
9b402849 JA |
10712 | return 0; |
10713 | } | |
10714 | ||
10715 | return -ENXIO; | |
10716 | } | |
10717 | ||
5a2e745d JA |
10718 | static void io_destroy_buffers(struct io_ring_ctx *ctx) |
10719 | { | |
9cfc7e94 JA |
10720 | struct io_buffer_list *bl; |
10721 | unsigned long index; | |
dbc7d452 JA |
10722 | int i; |
10723 | ||
9cfc7e94 JA |
10724 | for (i = 0; i < BGID_ARRAY; i++) { |
10725 | if (!ctx->io_bl) | |
10726 | break; | |
10727 | __io_remove_buffers(ctx, &ctx->io_bl[i], -1U); | |
10728 | } | |
dbc7d452 | 10729 | |
9cfc7e94 JA |
10730 | xa_for_each(&ctx->io_bl_xa, index, bl) { |
10731 | xa_erase(&ctx->io_bl_xa, bl->bgid); | |
10732 | __io_remove_buffers(ctx, bl, -1U); | |
dbc7d452 | 10733 | } |
cc3cec83 JA |
10734 | |
10735 | while (!list_empty(&ctx->io_buffers_pages)) { | |
10736 | struct page *page; | |
10737 | ||
10738 | page = list_first_entry(&ctx->io_buffers_pages, struct page, lru); | |
10739 | list_del_init(&page->lru); | |
10740 | __free_page(page); | |
10741 | } | |
5a2e745d JA |
10742 | } |
10743 | ||
4010fec4 | 10744 | static void io_req_caches_free(struct io_ring_ctx *ctx) |
2b188cc1 | 10745 | { |
cd0ca2e0 | 10746 | struct io_submit_state *state = &ctx->submit_state; |
37f0e767 | 10747 | int nr = 0; |
bf019da7 | 10748 | |
9a4fdbd8 | 10749 | mutex_lock(&ctx->uring_lock); |
cd0ca2e0 | 10750 | io_flush_cached_locked_reqs(ctx, state); |
9a4fdbd8 | 10751 | |
88ab95be | 10752 | while (!io_req_cache_empty(ctx)) { |
c2b6c6bc PB |
10753 | struct io_wq_work_node *node; |
10754 | struct io_kiocb *req; | |
9a4fdbd8 | 10755 | |
c2b6c6bc PB |
10756 | node = wq_stack_extract(&state->free_list); |
10757 | req = container_of(node, struct io_kiocb, comp_list); | |
10758 | kmem_cache_free(req_cachep, req); | |
37f0e767 | 10759 | nr++; |
c2b6c6bc | 10760 | } |
37f0e767 PB |
10761 | if (nr) |
10762 | percpu_ref_put_many(&ctx->refs, nr); | |
9a4fdbd8 JA |
10763 | mutex_unlock(&ctx->uring_lock); |
10764 | } | |
10765 | ||
43597aac | 10766 | static void io_wait_rsrc_data(struct io_rsrc_data *data) |
2b188cc1 | 10767 | { |
43597aac | 10768 | if (data && !atomic_dec_and_test(&data->refs)) |
bd54b6fe | 10769 | wait_for_completion(&data->done); |
bd54b6fe | 10770 | } |
04fc6c80 | 10771 | |
4d9237e3 JA |
10772 | static void io_flush_apoll_cache(struct io_ring_ctx *ctx) |
10773 | { | |
10774 | struct async_poll *apoll; | |
10775 | ||
10776 | while (!list_empty(&ctx->apoll_cache)) { | |
10777 | apoll = list_first_entry(&ctx->apoll_cache, struct async_poll, | |
10778 | poll.wait.entry); | |
10779 | list_del(&apoll->poll.wait.entry); | |
10780 | kfree(apoll); | |
10781 | } | |
10782 | } | |
10783 | ||
c072481d | 10784 | static __cold void io_ring_ctx_free(struct io_ring_ctx *ctx) |
2b188cc1 | 10785 | { |
37d1e2e3 | 10786 | io_sq_thread_finish(ctx); |
2aede0e4 | 10787 | |
37d1e2e3 | 10788 | if (ctx->mm_account) { |
2aede0e4 JA |
10789 | mmdrop(ctx->mm_account); |
10790 | ctx->mm_account = NULL; | |
30975825 | 10791 | } |
def596e9 | 10792 | |
ab409402 | 10793 | io_rsrc_refs_drop(ctx); |
43597aac PB |
10794 | /* __io_rsrc_put_work() may need uring_lock to progress, wait w/o it */ |
10795 | io_wait_rsrc_data(ctx->buf_data); | |
10796 | io_wait_rsrc_data(ctx->file_data); | |
10797 | ||
8bad28d8 | 10798 | mutex_lock(&ctx->uring_lock); |
43597aac | 10799 | if (ctx->buf_data) |
bd54b6fe | 10800 | __io_sqe_buffers_unregister(ctx); |
43597aac | 10801 | if (ctx->file_data) |
08480400 | 10802 | __io_sqe_files_unregister(ctx); |
c4ea060e PB |
10803 | if (ctx->rings) |
10804 | __io_cqring_overflow_flush(ctx, true); | |
9b402849 | 10805 | io_eventfd_unregister(ctx); |
4d9237e3 | 10806 | io_flush_apoll_cache(ctx); |
77bc59b4 | 10807 | mutex_unlock(&ctx->uring_lock); |
5a2e745d | 10808 | io_destroy_buffers(ctx); |
07db298a PB |
10809 | if (ctx->sq_creds) |
10810 | put_cred(ctx->sq_creds); | |
def596e9 | 10811 | |
a7f0ed5a PB |
10812 | /* there are no registered resources left, nobody uses it */ |
10813 | if (ctx->rsrc_node) | |
10814 | io_rsrc_node_destroy(ctx->rsrc_node); | |
8dd03afe | 10815 | if (ctx->rsrc_backup_node) |
b895c9a6 | 10816 | io_rsrc_node_destroy(ctx->rsrc_backup_node); |
a7f0ed5a | 10817 | flush_delayed_work(&ctx->rsrc_put_work); |
756ab7c0 | 10818 | flush_delayed_work(&ctx->fallback_work); |
a7f0ed5a PB |
10819 | |
10820 | WARN_ON_ONCE(!list_empty(&ctx->rsrc_ref_list)); | |
10821 | WARN_ON_ONCE(!llist_empty(&ctx->rsrc_put_llist)); | |
def596e9 | 10822 | |
2b188cc1 | 10823 | #if defined(CONFIG_UNIX) |
355e8d26 EB |
10824 | if (ctx->ring_sock) { |
10825 | ctx->ring_sock->file = NULL; /* so that iput() is called */ | |
2b188cc1 | 10826 | sock_release(ctx->ring_sock); |
355e8d26 | 10827 | } |
2b188cc1 | 10828 | #endif |
ef9dd637 | 10829 | WARN_ON_ONCE(!list_empty(&ctx->ltimeout_list)); |
2b188cc1 | 10830 | |
75b28aff | 10831 | io_mem_free(ctx->rings); |
2b188cc1 | 10832 | io_mem_free(ctx->sq_sqes); |
2b188cc1 JA |
10833 | |
10834 | percpu_ref_exit(&ctx->refs); | |
2b188cc1 | 10835 | free_uid(ctx->user); |
4010fec4 | 10836 | io_req_caches_free(ctx); |
e941894e JA |
10837 | if (ctx->hash_map) |
10838 | io_wq_put_hash(ctx->hash_map); | |
78076bb6 | 10839 | kfree(ctx->cancel_hash); |
6224843d | 10840 | kfree(ctx->dummy_ubuf); |
9cfc7e94 JA |
10841 | kfree(ctx->io_bl); |
10842 | xa_destroy(&ctx->io_bl_xa); | |
2b188cc1 JA |
10843 | kfree(ctx); |
10844 | } | |
10845 | ||
10846 | static __poll_t io_uring_poll(struct file *file, poll_table *wait) | |
10847 | { | |
10848 | struct io_ring_ctx *ctx = file->private_data; | |
10849 | __poll_t mask = 0; | |
10850 | ||
d60aa65b | 10851 | poll_wait(file, &ctx->cq_wait, wait); |
4f7067c3 SB |
10852 | /* |
10853 | * synchronizes with barrier from wq_has_sleeper call in | |
10854 | * io_commit_cqring | |
10855 | */ | |
2b188cc1 | 10856 | smp_rmb(); |
90554200 | 10857 | if (!io_sqring_full(ctx)) |
2b188cc1 | 10858 | mask |= EPOLLOUT | EPOLLWRNORM; |
ed670c3f HX |
10859 | |
10860 | /* | |
10861 | * Don't flush cqring overflow list here, just do a simple check. | |
10862 | * Otherwise there could possible be ABBA deadlock: | |
10863 | * CPU0 CPU1 | |
10864 | * ---- ---- | |
10865 | * lock(&ctx->uring_lock); | |
10866 | * lock(&ep->mtx); | |
10867 | * lock(&ctx->uring_lock); | |
10868 | * lock(&ep->mtx); | |
10869 | * | |
10870 | * Users may get EPOLLIN meanwhile seeing nothing in cqring, this | |
10871 | * pushs them to do the flush. | |
10872 | */ | |
10988a0a DY |
10873 | if (io_cqring_events(ctx) || |
10874 | test_bit(IO_CHECK_CQ_OVERFLOW_BIT, &ctx->check_cq)) | |
2b188cc1 JA |
10875 | mask |= EPOLLIN | EPOLLRDNORM; |
10876 | ||
10877 | return mask; | |
10878 | } | |
10879 | ||
0bead8cd | 10880 | static int io_unregister_personality(struct io_ring_ctx *ctx, unsigned id) |
071698e1 | 10881 | { |
4379bf8b | 10882 | const struct cred *creds; |
071698e1 | 10883 | |
61cf9370 | 10884 | creds = xa_erase(&ctx->personalities, id); |
4379bf8b JA |
10885 | if (creds) { |
10886 | put_cred(creds); | |
0bead8cd | 10887 | return 0; |
1e6fa521 | 10888 | } |
0bead8cd YD |
10889 | |
10890 | return -EINVAL; | |
10891 | } | |
10892 | ||
d56d938b PB |
10893 | struct io_tctx_exit { |
10894 | struct callback_head task_work; | |
10895 | struct completion completion; | |
baf186c4 | 10896 | struct io_ring_ctx *ctx; |
d56d938b PB |
10897 | }; |
10898 | ||
c072481d | 10899 | static __cold void io_tctx_exit_cb(struct callback_head *cb) |
d56d938b PB |
10900 | { |
10901 | struct io_uring_task *tctx = current->io_uring; | |
10902 | struct io_tctx_exit *work; | |
10903 | ||
10904 | work = container_of(cb, struct io_tctx_exit, task_work); | |
10905 | /* | |
10906 | * When @in_idle, we're in cancellation and it's racy to remove the | |
10907 | * node. It'll be removed by the end of cancellation, just ignore it. | |
10908 | */ | |
10909 | if (!atomic_read(&tctx->in_idle)) | |
eef51daa | 10910 | io_uring_del_tctx_node((unsigned long)work->ctx); |
d56d938b PB |
10911 | complete(&work->completion); |
10912 | } | |
10913 | ||
c072481d | 10914 | static __cold bool io_cancel_ctx_cb(struct io_wq_work *work, void *data) |
28090c13 PB |
10915 | { |
10916 | struct io_kiocb *req = container_of(work, struct io_kiocb, work); | |
10917 | ||
10918 | return req->ctx == data; | |
10919 | } | |
10920 | ||
c072481d | 10921 | static __cold void io_ring_exit_work(struct work_struct *work) |
85faa7b8 | 10922 | { |
d56d938b | 10923 | struct io_ring_ctx *ctx = container_of(work, struct io_ring_ctx, exit_work); |
b5bb3a24 | 10924 | unsigned long timeout = jiffies + HZ * 60 * 5; |
58d3be2c | 10925 | unsigned long interval = HZ / 20; |
d56d938b PB |
10926 | struct io_tctx_exit exit; |
10927 | struct io_tctx_node *node; | |
10928 | int ret; | |
85faa7b8 | 10929 | |
56952e91 JA |
10930 | /* |
10931 | * If we're doing polled IO and end up having requests being | |
10932 | * submitted async (out-of-line), then completions can come in while | |
10933 | * we're waiting for refs to drop. We need to reap these manually, | |
10934 | * as nobody else will be looking for them. | |
10935 | */ | |
b2edc0a7 | 10936 | do { |
3dd0c97a | 10937 | io_uring_try_cancel_requests(ctx, NULL, true); |
28090c13 PB |
10938 | if (ctx->sq_data) { |
10939 | struct io_sq_data *sqd = ctx->sq_data; | |
10940 | struct task_struct *tsk; | |
10941 | ||
10942 | io_sq_thread_park(sqd); | |
10943 | tsk = sqd->thread; | |
10944 | if (tsk && tsk->io_uring && tsk->io_uring->io_wq) | |
10945 | io_wq_cancel_cb(tsk->io_uring->io_wq, | |
10946 | io_cancel_ctx_cb, ctx, true); | |
10947 | io_sq_thread_unpark(sqd); | |
10948 | } | |
b5bb3a24 | 10949 | |
37f0e767 PB |
10950 | io_req_caches_free(ctx); |
10951 | ||
58d3be2c PB |
10952 | if (WARN_ON_ONCE(time_after(jiffies, timeout))) { |
10953 | /* there is little hope left, don't run it too often */ | |
10954 | interval = HZ * 60; | |
10955 | } | |
10956 | } while (!wait_for_completion_timeout(&ctx->ref_comp, interval)); | |
d56d938b | 10957 | |
7f00651a PB |
10958 | init_completion(&exit.completion); |
10959 | init_task_work(&exit.task_work, io_tctx_exit_cb); | |
10960 | exit.ctx = ctx; | |
89b5066e PB |
10961 | /* |
10962 | * Some may use context even when all refs and requests have been put, | |
10963 | * and they are free to do so while still holding uring_lock or | |
5b0a6acc | 10964 | * completion_lock, see io_req_task_submit(). Apart from other work, |
89b5066e PB |
10965 | * this lock/unlock section also waits them to finish. |
10966 | */ | |
d56d938b PB |
10967 | mutex_lock(&ctx->uring_lock); |
10968 | while (!list_empty(&ctx->tctx_list)) { | |
b5bb3a24 PB |
10969 | WARN_ON_ONCE(time_after(jiffies, timeout)); |
10970 | ||
d56d938b PB |
10971 | node = list_first_entry(&ctx->tctx_list, struct io_tctx_node, |
10972 | ctx_node); | |
7f00651a PB |
10973 | /* don't spin on a single task if cancellation failed */ |
10974 | list_rotate_left(&ctx->tctx_list); | |
d56d938b PB |
10975 | ret = task_work_add(node->task, &exit.task_work, TWA_SIGNAL); |
10976 | if (WARN_ON_ONCE(ret)) | |
10977 | continue; | |
d56d938b PB |
10978 | |
10979 | mutex_unlock(&ctx->uring_lock); | |
10980 | wait_for_completion(&exit.completion); | |
d56d938b PB |
10981 | mutex_lock(&ctx->uring_lock); |
10982 | } | |
10983 | mutex_unlock(&ctx->uring_lock); | |
79ebeaee JA |
10984 | spin_lock(&ctx->completion_lock); |
10985 | spin_unlock(&ctx->completion_lock); | |
d56d938b | 10986 | |
85faa7b8 JA |
10987 | io_ring_ctx_free(ctx); |
10988 | } | |
10989 | ||
80c4cbdb | 10990 | /* Returns true if we found and killed one or more timeouts */ |
c072481d PB |
10991 | static __cold bool io_kill_timeouts(struct io_ring_ctx *ctx, |
10992 | struct task_struct *tsk, bool cancel_all) | |
80c4cbdb PB |
10993 | { |
10994 | struct io_kiocb *req, *tmp; | |
10995 | int canceled = 0; | |
10996 | ||
79ebeaee JA |
10997 | spin_lock(&ctx->completion_lock); |
10998 | spin_lock_irq(&ctx->timeout_lock); | |
80c4cbdb | 10999 | list_for_each_entry_safe(req, tmp, &ctx->timeout_list, timeout.list) { |
3dd0c97a | 11000 | if (io_match_task(req, tsk, cancel_all)) { |
80c4cbdb PB |
11001 | io_kill_timeout(req, -ECANCELED); |
11002 | canceled++; | |
11003 | } | |
11004 | } | |
79ebeaee | 11005 | spin_unlock_irq(&ctx->timeout_lock); |
60053be8 | 11006 | io_commit_cqring(ctx); |
79ebeaee | 11007 | spin_unlock(&ctx->completion_lock); |
80c4cbdb PB |
11008 | if (canceled != 0) |
11009 | io_cqring_ev_posted(ctx); | |
11010 | return canceled != 0; | |
11011 | } | |
11012 | ||
c072481d | 11013 | static __cold void io_ring_ctx_wait_and_kill(struct io_ring_ctx *ctx) |
2b188cc1 | 11014 | { |
61cf9370 MWO |
11015 | unsigned long index; |
11016 | struct creds *creds; | |
11017 | ||
2b188cc1 JA |
11018 | mutex_lock(&ctx->uring_lock); |
11019 | percpu_ref_kill(&ctx->refs); | |
634578f8 | 11020 | if (ctx->rings) |
6c2450ae | 11021 | __io_cqring_overflow_flush(ctx, true); |
61cf9370 MWO |
11022 | xa_for_each(&ctx->personalities, index, creds) |
11023 | io_unregister_personality(ctx, index); | |
2b188cc1 JA |
11024 | mutex_unlock(&ctx->uring_lock); |
11025 | ||
60053be8 PB |
11026 | /* failed during ring init, it couldn't have issued any requests */ |
11027 | if (ctx->rings) { | |
11028 | io_kill_timeouts(ctx, NULL, true); | |
11029 | io_poll_remove_all(ctx, NULL, true); | |
11030 | /* if we failed setting up the ctx, we might not have any rings */ | |
11031 | io_iopoll_try_reap_events(ctx); | |
11032 | } | |
309fc03a | 11033 | |
85faa7b8 | 11034 | INIT_WORK(&ctx->exit_work, io_ring_exit_work); |
fc666777 JA |
11035 | /* |
11036 | * Use system_unbound_wq to avoid spawning tons of event kworkers | |
11037 | * if we're exiting a ton of rings at the same time. It just adds | |
11038 | * noise and overhead, there's no discernable change in runtime | |
11039 | * over using system_wq. | |
11040 | */ | |
11041 | queue_work(system_unbound_wq, &ctx->exit_work); | |
2b188cc1 JA |
11042 | } |
11043 | ||
11044 | static int io_uring_release(struct inode *inode, struct file *file) | |
11045 | { | |
11046 | struct io_ring_ctx *ctx = file->private_data; | |
11047 | ||
11048 | file->private_data = NULL; | |
11049 | io_ring_ctx_wait_and_kill(ctx); | |
11050 | return 0; | |
11051 | } | |
11052 | ||
f6edbabb PB |
11053 | struct io_task_cancel { |
11054 | struct task_struct *task; | |
3dd0c97a | 11055 | bool all; |
f6edbabb | 11056 | }; |
f254ac04 | 11057 | |
f6edbabb | 11058 | static bool io_cancel_task_cb(struct io_wq_work *work, void *data) |
b711d4ea | 11059 | { |
9a472ef7 | 11060 | struct io_kiocb *req = container_of(work, struct io_kiocb, work); |
f6edbabb | 11061 | struct io_task_cancel *cancel = data; |
9a472ef7 | 11062 | |
6af3f48b | 11063 | return io_match_task_safe(req, cancel->task, cancel->all); |
b711d4ea JA |
11064 | } |
11065 | ||
c072481d PB |
11066 | static __cold bool io_cancel_defer_files(struct io_ring_ctx *ctx, |
11067 | struct task_struct *task, | |
11068 | bool cancel_all) | |
b7ddce3c | 11069 | { |
e1915f76 | 11070 | struct io_defer_entry *de; |
b7ddce3c PB |
11071 | LIST_HEAD(list); |
11072 | ||
79ebeaee | 11073 | spin_lock(&ctx->completion_lock); |
b7ddce3c | 11074 | list_for_each_entry_reverse(de, &ctx->defer_list, list) { |
6af3f48b | 11075 | if (io_match_task_safe(de->req, task, cancel_all)) { |
b7ddce3c PB |
11076 | list_cut_position(&list, &ctx->defer_list, &de->list); |
11077 | break; | |
11078 | } | |
11079 | } | |
79ebeaee | 11080 | spin_unlock(&ctx->completion_lock); |
e1915f76 PB |
11081 | if (list_empty(&list)) |
11082 | return false; | |
b7ddce3c PB |
11083 | |
11084 | while (!list_empty(&list)) { | |
11085 | de = list_first_entry(&list, struct io_defer_entry, list); | |
11086 | list_del_init(&de->list); | |
f41db273 | 11087 | io_req_complete_failed(de->req, -ECANCELED); |
b7ddce3c PB |
11088 | kfree(de); |
11089 | } | |
e1915f76 | 11090 | return true; |
b7ddce3c PB |
11091 | } |
11092 | ||
c072481d | 11093 | static __cold bool io_uring_try_cancel_iowq(struct io_ring_ctx *ctx) |
1b00764f PB |
11094 | { |
11095 | struct io_tctx_node *node; | |
11096 | enum io_wq_cancel cret; | |
11097 | bool ret = false; | |
11098 | ||
11099 | mutex_lock(&ctx->uring_lock); | |
11100 | list_for_each_entry(node, &ctx->tctx_list, ctx_node) { | |
11101 | struct io_uring_task *tctx = node->task->io_uring; | |
11102 | ||
11103 | /* | |
11104 | * io_wq will stay alive while we hold uring_lock, because it's | |
11105 | * killed after ctx nodes, which requires to take the lock. | |
11106 | */ | |
11107 | if (!tctx || !tctx->io_wq) | |
11108 | continue; | |
11109 | cret = io_wq_cancel_cb(tctx->io_wq, io_cancel_ctx_cb, ctx, true); | |
11110 | ret |= (cret != IO_WQ_CANCEL_NOTFOUND); | |
11111 | } | |
11112 | mutex_unlock(&ctx->uring_lock); | |
11113 | ||
11114 | return ret; | |
11115 | } | |
11116 | ||
c072481d PB |
11117 | static __cold void io_uring_try_cancel_requests(struct io_ring_ctx *ctx, |
11118 | struct task_struct *task, | |
11119 | bool cancel_all) | |
9936c7c2 | 11120 | { |
3dd0c97a | 11121 | struct io_task_cancel cancel = { .task = task, .all = cancel_all, }; |
1b00764f | 11122 | struct io_uring_task *tctx = task ? task->io_uring : NULL; |
9936c7c2 | 11123 | |
60053be8 PB |
11124 | /* failed during ring init, it couldn't have issued any requests */ |
11125 | if (!ctx->rings) | |
11126 | return; | |
11127 | ||
9936c7c2 PB |
11128 | while (1) { |
11129 | enum io_wq_cancel cret; | |
11130 | bool ret = false; | |
11131 | ||
1b00764f PB |
11132 | if (!task) { |
11133 | ret |= io_uring_try_cancel_iowq(ctx); | |
11134 | } else if (tctx && tctx->io_wq) { | |
11135 | /* | |
11136 | * Cancels requests of all rings, not only @ctx, but | |
11137 | * it's fine as the task is in exit/exec. | |
11138 | */ | |
5aa75ed5 | 11139 | cret = io_wq_cancel_cb(tctx->io_wq, io_cancel_task_cb, |
9936c7c2 PB |
11140 | &cancel, true); |
11141 | ret |= (cret != IO_WQ_CANCEL_NOTFOUND); | |
11142 | } | |
11143 | ||
11144 | /* SQPOLL thread does its own polling */ | |
3dd0c97a | 11145 | if ((!(ctx->flags & IORING_SETUP_SQPOLL) && cancel_all) || |
d052d1d6 | 11146 | (ctx->sq_data && ctx->sq_data->thread == current)) { |
5eef4e87 | 11147 | while (!wq_list_empty(&ctx->iopoll_list)) { |
9936c7c2 PB |
11148 | io_iopoll_try_reap_events(ctx); |
11149 | ret = true; | |
11150 | } | |
11151 | } | |
11152 | ||
3dd0c97a PB |
11153 | ret |= io_cancel_defer_files(ctx, task, cancel_all); |
11154 | ret |= io_poll_remove_all(ctx, task, cancel_all); | |
11155 | ret |= io_kill_timeouts(ctx, task, cancel_all); | |
e5dc480d PB |
11156 | if (task) |
11157 | ret |= io_run_task_work(); | |
9936c7c2 PB |
11158 | if (!ret) |
11159 | break; | |
11160 | cond_resched(); | |
11161 | } | |
11162 | } | |
11163 | ||
eef51daa | 11164 | static int __io_uring_add_tctx_node(struct io_ring_ctx *ctx) |
0f212204 | 11165 | { |
236434c3 | 11166 | struct io_uring_task *tctx = current->io_uring; |
13bf43f5 | 11167 | struct io_tctx_node *node; |
a528b04e | 11168 | int ret; |
236434c3 MWO |
11169 | |
11170 | if (unlikely(!tctx)) { | |
5aa75ed5 | 11171 | ret = io_uring_alloc_task_context(current, ctx); |
0f212204 JA |
11172 | if (unlikely(ret)) |
11173 | return ret; | |
e139a1ec | 11174 | |
236434c3 | 11175 | tctx = current->io_uring; |
e139a1ec PB |
11176 | if (ctx->iowq_limits_set) { |
11177 | unsigned int limits[2] = { ctx->iowq_limits[0], | |
11178 | ctx->iowq_limits[1], }; | |
11179 | ||
11180 | ret = io_wq_max_workers(tctx->io_wq, limits); | |
11181 | if (ret) | |
11182 | return ret; | |
11183 | } | |
0f212204 | 11184 | } |
cf27f3b1 PB |
11185 | if (!xa_load(&tctx->xa, (unsigned long)ctx)) { |
11186 | node = kmalloc(sizeof(*node), GFP_KERNEL); | |
11187 | if (!node) | |
11188 | return -ENOMEM; | |
11189 | node->ctx = ctx; | |
11190 | node->task = current; | |
13bf43f5 | 11191 | |
cf27f3b1 PB |
11192 | ret = xa_err(xa_store(&tctx->xa, (unsigned long)ctx, |
11193 | node, GFP_KERNEL)); | |
11194 | if (ret) { | |
11195 | kfree(node); | |
11196 | return ret; | |
0f212204 | 11197 | } |
cf27f3b1 PB |
11198 | |
11199 | mutex_lock(&ctx->uring_lock); | |
11200 | list_add(&node->ctx_node, &ctx->tctx_list); | |
11201 | mutex_unlock(&ctx->uring_lock); | |
0f212204 | 11202 | } |
cf27f3b1 | 11203 | tctx->last = ctx; |
0f212204 JA |
11204 | return 0; |
11205 | } | |
11206 | ||
cf27f3b1 PB |
11207 | /* |
11208 | * Note that this task has used io_uring. We use it for cancelation purposes. | |
11209 | */ | |
eef51daa | 11210 | static inline int io_uring_add_tctx_node(struct io_ring_ctx *ctx) |
cf27f3b1 PB |
11211 | { |
11212 | struct io_uring_task *tctx = current->io_uring; | |
11213 | ||
11214 | if (likely(tctx && tctx->last == ctx)) | |
11215 | return 0; | |
eef51daa | 11216 | return __io_uring_add_tctx_node(ctx); |
cf27f3b1 PB |
11217 | } |
11218 | ||
0f212204 JA |
11219 | /* |
11220 | * Remove this io_uring_file -> task mapping. | |
11221 | */ | |
c072481d | 11222 | static __cold void io_uring_del_tctx_node(unsigned long index) |
0f212204 JA |
11223 | { |
11224 | struct io_uring_task *tctx = current->io_uring; | |
13bf43f5 | 11225 | struct io_tctx_node *node; |
2941267b | 11226 | |
eebd2e37 PB |
11227 | if (!tctx) |
11228 | return; | |
13bf43f5 PB |
11229 | node = xa_erase(&tctx->xa, index); |
11230 | if (!node) | |
2941267b | 11231 | return; |
0f212204 | 11232 | |
13bf43f5 PB |
11233 | WARN_ON_ONCE(current != node->task); |
11234 | WARN_ON_ONCE(list_empty(&node->ctx_node)); | |
11235 | ||
11236 | mutex_lock(&node->ctx->uring_lock); | |
11237 | list_del(&node->ctx_node); | |
11238 | mutex_unlock(&node->ctx->uring_lock); | |
11239 | ||
baf186c4 | 11240 | if (tctx->last == node->ctx) |
0f212204 | 11241 | tctx->last = NULL; |
13bf43f5 | 11242 | kfree(node); |
0f212204 JA |
11243 | } |
11244 | ||
c072481d | 11245 | static __cold void io_uring_clean_tctx(struct io_uring_task *tctx) |
de7f1d9e | 11246 | { |
ba5ef6dc | 11247 | struct io_wq *wq = tctx->io_wq; |
13bf43f5 | 11248 | struct io_tctx_node *node; |
de7f1d9e PB |
11249 | unsigned long index; |
11250 | ||
8bab4c09 | 11251 | xa_for_each(&tctx->xa, index, node) { |
eef51daa | 11252 | io_uring_del_tctx_node(index); |
8bab4c09 JA |
11253 | cond_resched(); |
11254 | } | |
b16ef427 ME |
11255 | if (wq) { |
11256 | /* | |
f6f9b278 | 11257 | * Must be after io_uring_del_tctx_node() (removes nodes under |
b16ef427 ME |
11258 | * uring_lock) to avoid race with io_uring_try_cancel_iowq(). |
11259 | */ | |
ba5ef6dc | 11260 | io_wq_put_and_exit(wq); |
dadebc35 | 11261 | tctx->io_wq = NULL; |
b16ef427 | 11262 | } |
de7f1d9e PB |
11263 | } |
11264 | ||
3f48cf18 | 11265 | static s64 tctx_inflight(struct io_uring_task *tctx, bool tracked) |
521d6a73 | 11266 | { |
3f48cf18 | 11267 | if (tracked) |
d5361233 | 11268 | return 0; |
521d6a73 PB |
11269 | return percpu_counter_sum(&tctx->inflight); |
11270 | } | |
11271 | ||
78cc687b PB |
11272 | /* |
11273 | * Find any io_uring ctx that this task has registered or done IO on, and cancel | |
78a78060 | 11274 | * requests. @sqd should be not-null IFF it's an SQPOLL thread cancellation. |
78cc687b | 11275 | */ |
c072481d PB |
11276 | static __cold void io_uring_cancel_generic(bool cancel_all, |
11277 | struct io_sq_data *sqd) | |
0e9ddb39 | 11278 | { |
521d6a73 | 11279 | struct io_uring_task *tctx = current->io_uring; |
734551df | 11280 | struct io_ring_ctx *ctx; |
0e9ddb39 PB |
11281 | s64 inflight; |
11282 | DEFINE_WAIT(wait); | |
fdaf083c | 11283 | |
78cc687b PB |
11284 | WARN_ON_ONCE(sqd && sqd->thread != current); |
11285 | ||
6d042ffb PO |
11286 | if (!current->io_uring) |
11287 | return; | |
17a91051 PB |
11288 | if (tctx->io_wq) |
11289 | io_wq_exit_start(tctx->io_wq); | |
11290 | ||
0e9ddb39 PB |
11291 | atomic_inc(&tctx->in_idle); |
11292 | do { | |
e9dbe221 | 11293 | io_uring_drop_tctx_refs(current); |
0e9ddb39 | 11294 | /* read completions before cancelations */ |
78cc687b | 11295 | inflight = tctx_inflight(tctx, !cancel_all); |
0e9ddb39 PB |
11296 | if (!inflight) |
11297 | break; | |
fdaf083c | 11298 | |
78cc687b PB |
11299 | if (!sqd) { |
11300 | struct io_tctx_node *node; | |
11301 | unsigned long index; | |
0f212204 | 11302 | |
78cc687b PB |
11303 | xa_for_each(&tctx->xa, index, node) { |
11304 | /* sqpoll task will cancel all its requests */ | |
11305 | if (node->ctx->sq_data) | |
11306 | continue; | |
11307 | io_uring_try_cancel_requests(node->ctx, current, | |
11308 | cancel_all); | |
11309 | } | |
11310 | } else { | |
11311 | list_for_each_entry(ctx, &sqd->ctx_list, sqd_list) | |
11312 | io_uring_try_cancel_requests(ctx, current, | |
11313 | cancel_all); | |
11314 | } | |
17a91051 | 11315 | |
78a78060 JA |
11316 | prepare_to_wait(&tctx->wait, &wait, TASK_INTERRUPTIBLE); |
11317 | io_run_task_work(); | |
e9dbe221 | 11318 | io_uring_drop_tctx_refs(current); |
78a78060 | 11319 | |
0f212204 | 11320 | /* |
a1bb3cd5 PB |
11321 | * If we've seen completions, retry without waiting. This |
11322 | * avoids a race where a completion comes in before we did | |
11323 | * prepare_to_wait(). | |
0f212204 | 11324 | */ |
3dd0c97a | 11325 | if (inflight == tctx_inflight(tctx, !cancel_all)) |
a1bb3cd5 | 11326 | schedule(); |
f57555ed | 11327 | finish_wait(&tctx->wait, &wait); |
d8a6df10 | 11328 | } while (1); |
de7f1d9e | 11329 | |
8452d4a6 | 11330 | io_uring_clean_tctx(tctx); |
3dd0c97a | 11331 | if (cancel_all) { |
3cc7fdb9 PB |
11332 | /* |
11333 | * We shouldn't run task_works after cancel, so just leave | |
11334 | * ->in_idle set for normal exit. | |
11335 | */ | |
11336 | atomic_dec(&tctx->in_idle); | |
3f48cf18 PB |
11337 | /* for exec all current's requests should be gone, kill tctx */ |
11338 | __io_uring_free(current); | |
11339 | } | |
44e728b8 PB |
11340 | } |
11341 | ||
f552a27a | 11342 | void __io_uring_cancel(bool cancel_all) |
78cc687b | 11343 | { |
f552a27a | 11344 | io_uring_cancel_generic(cancel_all, NULL); |
78cc687b PB |
11345 | } |
11346 | ||
e7a6c00d JA |
11347 | void io_uring_unreg_ringfd(void) |
11348 | { | |
11349 | struct io_uring_task *tctx = current->io_uring; | |
11350 | int i; | |
11351 | ||
11352 | for (i = 0; i < IO_RINGFD_REG_MAX; i++) { | |
11353 | if (tctx->registered_rings[i]) { | |
11354 | fput(tctx->registered_rings[i]); | |
11355 | tctx->registered_rings[i] = NULL; | |
11356 | } | |
11357 | } | |
11358 | } | |
11359 | ||
11360 | static int io_ring_add_registered_fd(struct io_uring_task *tctx, int fd, | |
11361 | int start, int end) | |
11362 | { | |
11363 | struct file *file; | |
11364 | int offset; | |
11365 | ||
11366 | for (offset = start; offset < end; offset++) { | |
11367 | offset = array_index_nospec(offset, IO_RINGFD_REG_MAX); | |
11368 | if (tctx->registered_rings[offset]) | |
11369 | continue; | |
11370 | ||
11371 | file = fget(fd); | |
11372 | if (!file) { | |
11373 | return -EBADF; | |
11374 | } else if (file->f_op != &io_uring_fops) { | |
11375 | fput(file); | |
11376 | return -EOPNOTSUPP; | |
11377 | } | |
11378 | tctx->registered_rings[offset] = file; | |
11379 | return offset; | |
11380 | } | |
11381 | ||
11382 | return -EBUSY; | |
11383 | } | |
11384 | ||
11385 | /* | |
11386 | * Register a ring fd to avoid fdget/fdput for each io_uring_enter() | |
11387 | * invocation. User passes in an array of struct io_uring_rsrc_update | |
11388 | * with ->data set to the ring_fd, and ->offset given for the desired | |
11389 | * index. If no index is desired, application may set ->offset == -1U | |
11390 | * and we'll find an available index. Returns number of entries | |
11391 | * successfully processed, or < 0 on error if none were processed. | |
11392 | */ | |
11393 | static int io_ringfd_register(struct io_ring_ctx *ctx, void __user *__arg, | |
11394 | unsigned nr_args) | |
11395 | { | |
11396 | struct io_uring_rsrc_update __user *arg = __arg; | |
11397 | struct io_uring_rsrc_update reg; | |
11398 | struct io_uring_task *tctx; | |
11399 | int ret, i; | |
11400 | ||
11401 | if (!nr_args || nr_args > IO_RINGFD_REG_MAX) | |
11402 | return -EINVAL; | |
11403 | ||
11404 | mutex_unlock(&ctx->uring_lock); | |
11405 | ret = io_uring_add_tctx_node(ctx); | |
11406 | mutex_lock(&ctx->uring_lock); | |
11407 | if (ret) | |
11408 | return ret; | |
11409 | ||
11410 | tctx = current->io_uring; | |
11411 | for (i = 0; i < nr_args; i++) { | |
11412 | int start, end; | |
11413 | ||
11414 | if (copy_from_user(®, &arg[i], sizeof(reg))) { | |
11415 | ret = -EFAULT; | |
11416 | break; | |
11417 | } | |
11418 | ||
6fb53cf8 DY |
11419 | if (reg.resv) { |
11420 | ret = -EINVAL; | |
11421 | break; | |
11422 | } | |
11423 | ||
e7a6c00d JA |
11424 | if (reg.offset == -1U) { |
11425 | start = 0; | |
11426 | end = IO_RINGFD_REG_MAX; | |
11427 | } else { | |
11428 | if (reg.offset >= IO_RINGFD_REG_MAX) { | |
11429 | ret = -EINVAL; | |
11430 | break; | |
11431 | } | |
11432 | start = reg.offset; | |
11433 | end = start + 1; | |
11434 | } | |
11435 | ||
11436 | ret = io_ring_add_registered_fd(tctx, reg.data, start, end); | |
11437 | if (ret < 0) | |
11438 | break; | |
11439 | ||
11440 | reg.offset = ret; | |
11441 | if (copy_to_user(&arg[i], ®, sizeof(reg))) { | |
11442 | fput(tctx->registered_rings[reg.offset]); | |
11443 | tctx->registered_rings[reg.offset] = NULL; | |
11444 | ret = -EFAULT; | |
11445 | break; | |
11446 | } | |
11447 | } | |
11448 | ||
11449 | return i ? i : ret; | |
11450 | } | |
11451 | ||
11452 | static int io_ringfd_unregister(struct io_ring_ctx *ctx, void __user *__arg, | |
11453 | unsigned nr_args) | |
11454 | { | |
11455 | struct io_uring_rsrc_update __user *arg = __arg; | |
11456 | struct io_uring_task *tctx = current->io_uring; | |
11457 | struct io_uring_rsrc_update reg; | |
11458 | int ret = 0, i; | |
11459 | ||
11460 | if (!nr_args || nr_args > IO_RINGFD_REG_MAX) | |
11461 | return -EINVAL; | |
11462 | if (!tctx) | |
11463 | return 0; | |
11464 | ||
11465 | for (i = 0; i < nr_args; i++) { | |
11466 | if (copy_from_user(®, &arg[i], sizeof(reg))) { | |
11467 | ret = -EFAULT; | |
11468 | break; | |
11469 | } | |
303cc749 | 11470 | if (reg.resv || reg.data || reg.offset >= IO_RINGFD_REG_MAX) { |
e7a6c00d JA |
11471 | ret = -EINVAL; |
11472 | break; | |
11473 | } | |
11474 | ||
11475 | reg.offset = array_index_nospec(reg.offset, IO_RINGFD_REG_MAX); | |
11476 | if (tctx->registered_rings[reg.offset]) { | |
11477 | fput(tctx->registered_rings[reg.offset]); | |
11478 | tctx->registered_rings[reg.offset] = NULL; | |
11479 | } | |
11480 | } | |
11481 | ||
11482 | return i ? i : ret; | |
11483 | } | |
11484 | ||
6c5c240e RP |
11485 | static void *io_uring_validate_mmap_request(struct file *file, |
11486 | loff_t pgoff, size_t sz) | |
2b188cc1 | 11487 | { |
2b188cc1 | 11488 | struct io_ring_ctx *ctx = file->private_data; |
6c5c240e | 11489 | loff_t offset = pgoff << PAGE_SHIFT; |
2b188cc1 JA |
11490 | struct page *page; |
11491 | void *ptr; | |
11492 | ||
11493 | switch (offset) { | |
11494 | case IORING_OFF_SQ_RING: | |
75b28aff HV |
11495 | case IORING_OFF_CQ_RING: |
11496 | ptr = ctx->rings; | |
2b188cc1 JA |
11497 | break; |
11498 | case IORING_OFF_SQES: | |
11499 | ptr = ctx->sq_sqes; | |
11500 | break; | |
2b188cc1 | 11501 | default: |
6c5c240e | 11502 | return ERR_PTR(-EINVAL); |
2b188cc1 JA |
11503 | } |
11504 | ||
11505 | page = virt_to_head_page(ptr); | |
a50b854e | 11506 | if (sz > page_size(page)) |
6c5c240e RP |
11507 | return ERR_PTR(-EINVAL); |
11508 | ||
11509 | return ptr; | |
11510 | } | |
11511 | ||
11512 | #ifdef CONFIG_MMU | |
11513 | ||
c072481d | 11514 | static __cold int io_uring_mmap(struct file *file, struct vm_area_struct *vma) |
6c5c240e RP |
11515 | { |
11516 | size_t sz = vma->vm_end - vma->vm_start; | |
11517 | unsigned long pfn; | |
11518 | void *ptr; | |
11519 | ||
11520 | ptr = io_uring_validate_mmap_request(file, vma->vm_pgoff, sz); | |
11521 | if (IS_ERR(ptr)) | |
11522 | return PTR_ERR(ptr); | |
2b188cc1 JA |
11523 | |
11524 | pfn = virt_to_phys(ptr) >> PAGE_SHIFT; | |
11525 | return remap_pfn_range(vma, vma->vm_start, pfn, sz, vma->vm_page_prot); | |
11526 | } | |
11527 | ||
6c5c240e RP |
11528 | #else /* !CONFIG_MMU */ |
11529 | ||
11530 | static int io_uring_mmap(struct file *file, struct vm_area_struct *vma) | |
11531 | { | |
11532 | return vma->vm_flags & (VM_SHARED | VM_MAYSHARE) ? 0 : -EINVAL; | |
11533 | } | |
11534 | ||
11535 | static unsigned int io_uring_nommu_mmap_capabilities(struct file *file) | |
11536 | { | |
11537 | return NOMMU_MAP_DIRECT | NOMMU_MAP_READ | NOMMU_MAP_WRITE; | |
11538 | } | |
11539 | ||
11540 | static unsigned long io_uring_nommu_get_unmapped_area(struct file *file, | |
11541 | unsigned long addr, unsigned long len, | |
11542 | unsigned long pgoff, unsigned long flags) | |
11543 | { | |
11544 | void *ptr; | |
11545 | ||
11546 | ptr = io_uring_validate_mmap_request(file, pgoff, len); | |
11547 | if (IS_ERR(ptr)) | |
11548 | return PTR_ERR(ptr); | |
11549 | ||
11550 | return (unsigned long) ptr; | |
11551 | } | |
11552 | ||
11553 | #endif /* !CONFIG_MMU */ | |
11554 | ||
d9d05217 | 11555 | static int io_sqpoll_wait_sq(struct io_ring_ctx *ctx) |
90554200 JA |
11556 | { |
11557 | DEFINE_WAIT(wait); | |
11558 | ||
11559 | do { | |
11560 | if (!io_sqring_full(ctx)) | |
11561 | break; | |
90554200 JA |
11562 | prepare_to_wait(&ctx->sqo_sq_wait, &wait, TASK_INTERRUPTIBLE); |
11563 | ||
11564 | if (!io_sqring_full(ctx)) | |
11565 | break; | |
90554200 JA |
11566 | schedule(); |
11567 | } while (!signal_pending(current)); | |
11568 | ||
11569 | finish_wait(&ctx->sqo_sq_wait, &wait); | |
5199328a | 11570 | return 0; |
90554200 JA |
11571 | } |
11572 | ||
f81440d3 PB |
11573 | static int io_validate_ext_arg(unsigned flags, const void __user *argp, size_t argsz) |
11574 | { | |
11575 | if (flags & IORING_ENTER_EXT_ARG) { | |
11576 | struct io_uring_getevents_arg arg; | |
11577 | ||
11578 | if (argsz != sizeof(arg)) | |
11579 | return -EINVAL; | |
11580 | if (copy_from_user(&arg, argp, sizeof(arg))) | |
11581 | return -EFAULT; | |
11582 | } | |
11583 | return 0; | |
11584 | } | |
11585 | ||
c73ebb68 HX |
11586 | static int io_get_ext_arg(unsigned flags, const void __user *argp, size_t *argsz, |
11587 | struct __kernel_timespec __user **ts, | |
11588 | const sigset_t __user **sig) | |
11589 | { | |
11590 | struct io_uring_getevents_arg arg; | |
11591 | ||
11592 | /* | |
11593 | * If EXT_ARG isn't set, then we have no timespec and the argp pointer | |
11594 | * is just a pointer to the sigset_t. | |
11595 | */ | |
11596 | if (!(flags & IORING_ENTER_EXT_ARG)) { | |
11597 | *sig = (const sigset_t __user *) argp; | |
11598 | *ts = NULL; | |
11599 | return 0; | |
11600 | } | |
11601 | ||
11602 | /* | |
11603 | * EXT_ARG is set - ensure we agree on the size of it and copy in our | |
11604 | * timespec and sigset_t pointers if good. | |
11605 | */ | |
11606 | if (*argsz != sizeof(arg)) | |
11607 | return -EINVAL; | |
11608 | if (copy_from_user(&arg, argp, sizeof(arg))) | |
11609 | return -EFAULT; | |
d2347b96 DY |
11610 | if (arg.pad) |
11611 | return -EINVAL; | |
c73ebb68 HX |
11612 | *sig = u64_to_user_ptr(arg.sigmask); |
11613 | *argsz = arg.sigmask_sz; | |
11614 | *ts = u64_to_user_ptr(arg.ts); | |
11615 | return 0; | |
11616 | } | |
11617 | ||
2b188cc1 | 11618 | SYSCALL_DEFINE6(io_uring_enter, unsigned int, fd, u32, to_submit, |
c73ebb68 HX |
11619 | u32, min_complete, u32, flags, const void __user *, argp, |
11620 | size_t, argsz) | |
2b188cc1 JA |
11621 | { |
11622 | struct io_ring_ctx *ctx; | |
2b188cc1 | 11623 | struct fd f; |
33f993da | 11624 | long ret; |
2b188cc1 | 11625 | |
4c6e277c | 11626 | io_run_task_work(); |
b41e9852 | 11627 | |
33f993da | 11628 | if (unlikely(flags & ~(IORING_ENTER_GETEVENTS | IORING_ENTER_SQ_WAKEUP | |
e7a6c00d JA |
11629 | IORING_ENTER_SQ_WAIT | IORING_ENTER_EXT_ARG | |
11630 | IORING_ENTER_REGISTERED_RING))) | |
2b188cc1 JA |
11631 | return -EINVAL; |
11632 | ||
e7a6c00d JA |
11633 | /* |
11634 | * Ring fd has been registered via IORING_REGISTER_RING_FDS, we | |
11635 | * need only dereference our task private array to find it. | |
11636 | */ | |
11637 | if (flags & IORING_ENTER_REGISTERED_RING) { | |
11638 | struct io_uring_task *tctx = current->io_uring; | |
11639 | ||
11640 | if (!tctx || fd >= IO_RINGFD_REG_MAX) | |
11641 | return -EINVAL; | |
11642 | fd = array_index_nospec(fd, IO_RINGFD_REG_MAX); | |
11643 | f.file = tctx->registered_rings[fd]; | |
11644 | if (unlikely(!f.file)) | |
11645 | return -EBADF; | |
11646 | } else { | |
11647 | f = fdget(fd); | |
11648 | if (unlikely(!f.file)) | |
11649 | return -EBADF; | |
11650 | } | |
2b188cc1 JA |
11651 | |
11652 | ret = -EOPNOTSUPP; | |
33f993da | 11653 | if (unlikely(f.file->f_op != &io_uring_fops)) |
2b188cc1 JA |
11654 | goto out_fput; |
11655 | ||
11656 | ret = -ENXIO; | |
11657 | ctx = f.file->private_data; | |
33f993da | 11658 | if (unlikely(!percpu_ref_tryget(&ctx->refs))) |
2b188cc1 JA |
11659 | goto out_fput; |
11660 | ||
7e84e1c7 | 11661 | ret = -EBADFD; |
33f993da | 11662 | if (unlikely(ctx->flags & IORING_SETUP_R_DISABLED)) |
7e84e1c7 SG |
11663 | goto out; |
11664 | ||
6c271ce2 JA |
11665 | /* |
11666 | * For SQ polling, the thread will do all submissions and completions. | |
11667 | * Just return the requested submit count, and wake the thread if | |
11668 | * we were asked to. | |
11669 | */ | |
b2a9eada | 11670 | ret = 0; |
6c271ce2 | 11671 | if (ctx->flags & IORING_SETUP_SQPOLL) { |
90f67366 | 11672 | io_cqring_overflow_flush(ctx); |
89448c47 | 11673 | |
21f96522 JA |
11674 | if (unlikely(ctx->sq_data->thread == NULL)) { |
11675 | ret = -EOWNERDEAD; | |
04147488 | 11676 | goto out; |
21f96522 | 11677 | } |
6c271ce2 | 11678 | if (flags & IORING_ENTER_SQ_WAKEUP) |
534ca6d6 | 11679 | wake_up(&ctx->sq_data->wait); |
d9d05217 PB |
11680 | if (flags & IORING_ENTER_SQ_WAIT) { |
11681 | ret = io_sqpoll_wait_sq(ctx); | |
11682 | if (ret) | |
11683 | goto out; | |
11684 | } | |
3e813c90 | 11685 | ret = to_submit; |
b2a9eada | 11686 | } else if (to_submit) { |
eef51daa | 11687 | ret = io_uring_add_tctx_node(ctx); |
0f212204 JA |
11688 | if (unlikely(ret)) |
11689 | goto out; | |
7c504e65 | 11690 | |
2b188cc1 | 11691 | mutex_lock(&ctx->uring_lock); |
3e813c90 DY |
11692 | ret = io_submit_sqes(ctx, to_submit); |
11693 | if (ret != to_submit) { | |
d487b43c | 11694 | mutex_unlock(&ctx->uring_lock); |
7c504e65 | 11695 | goto out; |
d487b43c PB |
11696 | } |
11697 | if ((flags & IORING_ENTER_GETEVENTS) && ctx->syscall_iopoll) | |
11698 | goto iopoll_locked; | |
11699 | mutex_unlock(&ctx->uring_lock); | |
2b188cc1 JA |
11700 | } |
11701 | if (flags & IORING_ENTER_GETEVENTS) { | |
3e813c90 | 11702 | int ret2; |
773697b6 | 11703 | if (ctx->syscall_iopoll) { |
d487b43c PB |
11704 | /* |
11705 | * We disallow the app entering submit/complete with | |
11706 | * polling, but we still need to lock the ring to | |
11707 | * prevent racing with polled issue that got punted to | |
11708 | * a workqueue. | |
11709 | */ | |
11710 | mutex_lock(&ctx->uring_lock); | |
11711 | iopoll_locked: | |
3e813c90 DY |
11712 | ret2 = io_validate_ext_arg(flags, argp, argsz); |
11713 | if (likely(!ret2)) { | |
11714 | min_complete = min(min_complete, | |
11715 | ctx->cq_entries); | |
11716 | ret2 = io_iopoll_check(ctx, min_complete); | |
d487b43c PB |
11717 | } |
11718 | mutex_unlock(&ctx->uring_lock); | |
def596e9 | 11719 | } else { |
f81440d3 PB |
11720 | const sigset_t __user *sig; |
11721 | struct __kernel_timespec __user *ts; | |
11722 | ||
3e813c90 DY |
11723 | ret2 = io_get_ext_arg(flags, argp, &argsz, &ts, &sig); |
11724 | if (likely(!ret2)) { | |
11725 | min_complete = min(min_complete, | |
11726 | ctx->cq_entries); | |
11727 | ret2 = io_cqring_wait(ctx, min_complete, sig, | |
11728 | argsz, ts); | |
11729 | } | |
def596e9 | 11730 | } |
c73ebb68 | 11731 | |
155bc950 | 11732 | if (!ret) { |
3e813c90 | 11733 | ret = ret2; |
2b188cc1 | 11734 | |
155bc950 DY |
11735 | /* |
11736 | * EBADR indicates that one or more CQE were dropped. | |
11737 | * Once the user has been informed we can clear the bit | |
11738 | * as they are obviously ok with those drops. | |
11739 | */ | |
11740 | if (unlikely(ret2 == -EBADR)) | |
11741 | clear_bit(IO_CHECK_CQ_DROPPED_BIT, | |
11742 | &ctx->check_cq); | |
def596e9 | 11743 | } |
2b188cc1 JA |
11744 | } |
11745 | ||
7c504e65 | 11746 | out: |
6805b32e | 11747 | percpu_ref_put(&ctx->refs); |
2b188cc1 | 11748 | out_fput: |
e7a6c00d JA |
11749 | if (!(flags & IORING_ENTER_REGISTERED_RING)) |
11750 | fdput(f); | |
3e813c90 | 11751 | return ret; |
2b188cc1 JA |
11752 | } |
11753 | ||
bebdb65e | 11754 | #ifdef CONFIG_PROC_FS |
c072481d | 11755 | static __cold int io_uring_show_cred(struct seq_file *m, unsigned int id, |
61cf9370 | 11756 | const struct cred *cred) |
87ce955b | 11757 | { |
87ce955b JA |
11758 | struct user_namespace *uns = seq_user_ns(m); |
11759 | struct group_info *gi; | |
11760 | kernel_cap_t cap; | |
11761 | unsigned __capi; | |
11762 | int g; | |
11763 | ||
11764 | seq_printf(m, "%5d\n", id); | |
11765 | seq_put_decimal_ull(m, "\tUid:\t", from_kuid_munged(uns, cred->uid)); | |
11766 | seq_put_decimal_ull(m, "\t\t", from_kuid_munged(uns, cred->euid)); | |
11767 | seq_put_decimal_ull(m, "\t\t", from_kuid_munged(uns, cred->suid)); | |
11768 | seq_put_decimal_ull(m, "\t\t", from_kuid_munged(uns, cred->fsuid)); | |
11769 | seq_put_decimal_ull(m, "\n\tGid:\t", from_kgid_munged(uns, cred->gid)); | |
11770 | seq_put_decimal_ull(m, "\t\t", from_kgid_munged(uns, cred->egid)); | |
11771 | seq_put_decimal_ull(m, "\t\t", from_kgid_munged(uns, cred->sgid)); | |
11772 | seq_put_decimal_ull(m, "\t\t", from_kgid_munged(uns, cred->fsgid)); | |
11773 | seq_puts(m, "\n\tGroups:\t"); | |
11774 | gi = cred->group_info; | |
11775 | for (g = 0; g < gi->ngroups; g++) { | |
11776 | seq_put_decimal_ull(m, g ? " " : "", | |
11777 | from_kgid_munged(uns, gi->gid[g])); | |
11778 | } | |
11779 | seq_puts(m, "\n\tCapEff:\t"); | |
11780 | cap = cred->cap_effective; | |
11781 | CAP_FOR_EACH_U32(__capi) | |
11782 | seq_put_hex_ll(m, NULL, cap.cap[CAP_LAST_U32 - __capi], 8); | |
11783 | seq_putc(m, '\n'); | |
11784 | return 0; | |
11785 | } | |
11786 | ||
c072481d PB |
11787 | static __cold void __io_uring_show_fdinfo(struct io_ring_ctx *ctx, |
11788 | struct seq_file *m) | |
87ce955b | 11789 | { |
dbbe9c64 | 11790 | struct io_sq_data *sq = NULL; |
83f84356 HX |
11791 | struct io_overflow_cqe *ocqe; |
11792 | struct io_rings *r = ctx->rings; | |
11793 | unsigned int sq_mask = ctx->sq_entries - 1, cq_mask = ctx->cq_entries - 1; | |
83f84356 HX |
11794 | unsigned int sq_head = READ_ONCE(r->sq.head); |
11795 | unsigned int sq_tail = READ_ONCE(r->sq.tail); | |
11796 | unsigned int cq_head = READ_ONCE(r->cq.head); | |
11797 | unsigned int cq_tail = READ_ONCE(r->cq.tail); | |
f9b3dfcc | 11798 | unsigned int cq_shift = 0; |
f75d1183 | 11799 | unsigned int sq_entries, cq_entries; |
fad8e0de | 11800 | bool has_lock; |
f9b3dfcc | 11801 | bool is_cqe32 = (ctx->flags & IORING_SETUP_CQE32); |
83f84356 HX |
11802 | unsigned int i; |
11803 | ||
f9b3dfcc SR |
11804 | if (is_cqe32) |
11805 | cq_shift = 1; | |
11806 | ||
83f84356 HX |
11807 | /* |
11808 | * we may get imprecise sqe and cqe info if uring is actively running | |
11809 | * since we get cached_sq_head and cached_cq_tail without uring_lock | |
11810 | * and sq_tail and cq_head are changed by userspace. But it's ok since | |
11811 | * we usually use these info when it is stuck. | |
11812 | */ | |
c0235652 | 11813 | seq_printf(m, "SqMask:\t0x%x\n", sq_mask); |
f75d1183 JA |
11814 | seq_printf(m, "SqHead:\t%u\n", sq_head); |
11815 | seq_printf(m, "SqTail:\t%u\n", sq_tail); | |
11816 | seq_printf(m, "CachedSqHead:\t%u\n", ctx->cached_sq_head); | |
11817 | seq_printf(m, "CqMask:\t0x%x\n", cq_mask); | |
11818 | seq_printf(m, "CqHead:\t%u\n", cq_head); | |
11819 | seq_printf(m, "CqTail:\t%u\n", cq_tail); | |
11820 | seq_printf(m, "CachedCqTail:\t%u\n", ctx->cached_cq_tail); | |
11821 | seq_printf(m, "SQEs:\t%u\n", sq_tail - ctx->cached_sq_head); | |
11822 | sq_entries = min(sq_tail - sq_head, ctx->sq_entries); | |
11823 | for (i = 0; i < sq_entries; i++) { | |
11824 | unsigned int entry = i + sq_head; | |
11825 | unsigned int sq_idx = READ_ONCE(ctx->sq_array[entry & sq_mask]); | |
a1957780 | 11826 | struct io_uring_sqe *sqe; |
f75d1183 JA |
11827 | |
11828 | if (sq_idx > sq_mask) | |
11829 | continue; | |
11830 | sqe = &ctx->sq_sqes[sq_idx]; | |
11831 | seq_printf(m, "%5u: opcode:%d, fd:%d, flags:%x, user_data:%llu\n", | |
11832 | sq_idx, sqe->opcode, sqe->fd, sqe->flags, | |
11833 | sqe->user_data); | |
83f84356 | 11834 | } |
f75d1183 JA |
11835 | seq_printf(m, "CQEs:\t%u\n", cq_tail - cq_head); |
11836 | cq_entries = min(cq_tail - cq_head, ctx->cq_entries); | |
11837 | for (i = 0; i < cq_entries; i++) { | |
11838 | unsigned int entry = i + cq_head; | |
f9b3dfcc | 11839 | struct io_uring_cqe *cqe = &r->cqes[(entry & cq_mask) << cq_shift]; |
83f84356 | 11840 | |
f9b3dfcc SR |
11841 | if (!is_cqe32) { |
11842 | seq_printf(m, "%5u: user_data:%llu, res:%d, flag:%x\n", | |
f75d1183 JA |
11843 | entry & cq_mask, cqe->user_data, cqe->res, |
11844 | cqe->flags); | |
f9b3dfcc SR |
11845 | } else { |
11846 | seq_printf(m, "%5u: user_data:%llu, res:%d, flag:%x, " | |
11847 | "extra1:%llu, extra2:%llu\n", | |
11848 | entry & cq_mask, cqe->user_data, cqe->res, | |
11849 | cqe->flags, cqe->big_cqe[0], cqe->big_cqe[1]); | |
11850 | } | |
83f84356 | 11851 | } |
87ce955b | 11852 | |
fad8e0de JA |
11853 | /* |
11854 | * Avoid ABBA deadlock between the seq lock and the io_uring mutex, | |
11855 | * since fdinfo case grabs it in the opposite direction of normal use | |
11856 | * cases. If we fail to get the lock, we just don't iterate any | |
11857 | * structures that could be going away outside the io_uring mutex. | |
11858 | */ | |
11859 | has_lock = mutex_trylock(&ctx->uring_lock); | |
11860 | ||
5f3f26f9 | 11861 | if (has_lock && (ctx->flags & IORING_SETUP_SQPOLL)) { |
dbbe9c64 | 11862 | sq = ctx->sq_data; |
5f3f26f9 JA |
11863 | if (!sq->thread) |
11864 | sq = NULL; | |
11865 | } | |
dbbe9c64 JQ |
11866 | |
11867 | seq_printf(m, "SqThread:\t%d\n", sq ? task_pid_nr(sq->thread) : -1); | |
11868 | seq_printf(m, "SqThreadCpu:\t%d\n", sq ? task_cpu(sq->thread) : -1); | |
87ce955b | 11869 | seq_printf(m, "UserFiles:\t%u\n", ctx->nr_user_files); |
fad8e0de | 11870 | for (i = 0; has_lock && i < ctx->nr_user_files; i++) { |
7b29f92d | 11871 | struct file *f = io_file_from_index(ctx, i); |
87ce955b | 11872 | |
87ce955b JA |
11873 | if (f) |
11874 | seq_printf(m, "%5u: %s\n", i, file_dentry(f)->d_iname); | |
11875 | else | |
11876 | seq_printf(m, "%5u: <none>\n", i); | |
11877 | } | |
11878 | seq_printf(m, "UserBufs:\t%u\n", ctx->nr_user_bufs); | |
fad8e0de | 11879 | for (i = 0; has_lock && i < ctx->nr_user_bufs; i++) { |
41edf1a5 | 11880 | struct io_mapped_ubuf *buf = ctx->user_bufs[i]; |
4751f53d | 11881 | unsigned int len = buf->ubuf_end - buf->ubuf; |
87ce955b | 11882 | |
4751f53d | 11883 | seq_printf(m, "%5u: 0x%llx/%u\n", i, buf->ubuf, len); |
87ce955b | 11884 | } |
61cf9370 MWO |
11885 | if (has_lock && !xa_empty(&ctx->personalities)) { |
11886 | unsigned long index; | |
11887 | const struct cred *cred; | |
11888 | ||
87ce955b | 11889 | seq_printf(m, "Personalities:\n"); |
61cf9370 MWO |
11890 | xa_for_each(&ctx->personalities, index, cred) |
11891 | io_uring_show_cred(m, index, cred); | |
87ce955b | 11892 | } |
83f84356 HX |
11893 | if (has_lock) |
11894 | mutex_unlock(&ctx->uring_lock); | |
11895 | ||
11896 | seq_puts(m, "PollList:\n"); | |
79ebeaee | 11897 | spin_lock(&ctx->completion_lock); |
d7718a9d JA |
11898 | for (i = 0; i < (1U << ctx->cancel_hash_bits); i++) { |
11899 | struct hlist_head *list = &ctx->cancel_hash[i]; | |
11900 | struct io_kiocb *req; | |
11901 | ||
11902 | hlist_for_each_entry(req, list, hash_node) | |
11903 | seq_printf(m, " op=%d, task_works=%d\n", req->opcode, | |
7f62d40d | 11904 | task_work_pending(req->task)); |
d7718a9d | 11905 | } |
83f84356 HX |
11906 | |
11907 | seq_puts(m, "CqOverflowList:\n"); | |
11908 | list_for_each_entry(ocqe, &ctx->cq_overflow_list, list) { | |
11909 | struct io_uring_cqe *cqe = &ocqe->cqe; | |
11910 | ||
11911 | seq_printf(m, " user_data=%llu, res=%d, flags=%x\n", | |
11912 | cqe->user_data, cqe->res, cqe->flags); | |
11913 | ||
11914 | } | |
11915 | ||
79ebeaee | 11916 | spin_unlock(&ctx->completion_lock); |
87ce955b JA |
11917 | } |
11918 | ||
c072481d | 11919 | static __cold void io_uring_show_fdinfo(struct seq_file *m, struct file *f) |
87ce955b JA |
11920 | { |
11921 | struct io_ring_ctx *ctx = f->private_data; | |
11922 | ||
11923 | if (percpu_ref_tryget(&ctx->refs)) { | |
11924 | __io_uring_show_fdinfo(ctx, m); | |
11925 | percpu_ref_put(&ctx->refs); | |
11926 | } | |
11927 | } | |
bebdb65e | 11928 | #endif |
87ce955b | 11929 | |
2b188cc1 JA |
11930 | static const struct file_operations io_uring_fops = { |
11931 | .release = io_uring_release, | |
11932 | .mmap = io_uring_mmap, | |
6c5c240e RP |
11933 | #ifndef CONFIG_MMU |
11934 | .get_unmapped_area = io_uring_nommu_get_unmapped_area, | |
11935 | .mmap_capabilities = io_uring_nommu_mmap_capabilities, | |
11936 | #endif | |
2b188cc1 | 11937 | .poll = io_uring_poll, |
bebdb65e | 11938 | #ifdef CONFIG_PROC_FS |
87ce955b | 11939 | .show_fdinfo = io_uring_show_fdinfo, |
bebdb65e | 11940 | #endif |
2b188cc1 JA |
11941 | }; |
11942 | ||
c072481d PB |
11943 | static __cold int io_allocate_scq_urings(struct io_ring_ctx *ctx, |
11944 | struct io_uring_params *p) | |
2b188cc1 | 11945 | { |
75b28aff HV |
11946 | struct io_rings *rings; |
11947 | size_t size, sq_array_offset; | |
2b188cc1 | 11948 | |
bd740481 JA |
11949 | /* make sure these are sane, as we already accounted them */ |
11950 | ctx->sq_entries = p->sq_entries; | |
11951 | ctx->cq_entries = p->cq_entries; | |
11952 | ||
baf9cb64 | 11953 | size = rings_size(ctx, p->sq_entries, p->cq_entries, &sq_array_offset); |
75b28aff HV |
11954 | if (size == SIZE_MAX) |
11955 | return -EOVERFLOW; | |
11956 | ||
11957 | rings = io_mem_alloc(size); | |
11958 | if (!rings) | |
2b188cc1 JA |
11959 | return -ENOMEM; |
11960 | ||
75b28aff HV |
11961 | ctx->rings = rings; |
11962 | ctx->sq_array = (u32 *)((char *)rings + sq_array_offset); | |
11963 | rings->sq_ring_mask = p->sq_entries - 1; | |
11964 | rings->cq_ring_mask = p->cq_entries - 1; | |
11965 | rings->sq_ring_entries = p->sq_entries; | |
11966 | rings->cq_ring_entries = p->cq_entries; | |
2b188cc1 | 11967 | |
ebdeb7c0 JA |
11968 | if (p->flags & IORING_SETUP_SQE128) |
11969 | size = array_size(2 * sizeof(struct io_uring_sqe), p->sq_entries); | |
11970 | else | |
11971 | size = array_size(sizeof(struct io_uring_sqe), p->sq_entries); | |
eb065d30 JA |
11972 | if (size == SIZE_MAX) { |
11973 | io_mem_free(ctx->rings); | |
11974 | ctx->rings = NULL; | |
2b188cc1 | 11975 | return -EOVERFLOW; |
eb065d30 | 11976 | } |
2b188cc1 JA |
11977 | |
11978 | ctx->sq_sqes = io_mem_alloc(size); | |
eb065d30 JA |
11979 | if (!ctx->sq_sqes) { |
11980 | io_mem_free(ctx->rings); | |
11981 | ctx->rings = NULL; | |
2b188cc1 | 11982 | return -ENOMEM; |
eb065d30 | 11983 | } |
2b188cc1 | 11984 | |
2b188cc1 JA |
11985 | return 0; |
11986 | } | |
11987 | ||
9faadcc8 PB |
11988 | static int io_uring_install_fd(struct io_ring_ctx *ctx, struct file *file) |
11989 | { | |
11990 | int ret, fd; | |
11991 | ||
11992 | fd = get_unused_fd_flags(O_RDWR | O_CLOEXEC); | |
11993 | if (fd < 0) | |
11994 | return fd; | |
11995 | ||
eef51daa | 11996 | ret = io_uring_add_tctx_node(ctx); |
9faadcc8 PB |
11997 | if (ret) { |
11998 | put_unused_fd(fd); | |
11999 | return ret; | |
12000 | } | |
12001 | fd_install(fd, file); | |
12002 | return fd; | |
12003 | } | |
12004 | ||
2b188cc1 JA |
12005 | /* |
12006 | * Allocate an anonymous fd, this is what constitutes the application | |
12007 | * visible backing of an io_uring instance. The application mmaps this | |
12008 | * fd to gain access to the SQ/CQ ring details. If UNIX sockets are enabled, | |
12009 | * we have to tie this fd to a socket for file garbage collection purposes. | |
12010 | */ | |
9faadcc8 | 12011 | static struct file *io_uring_get_file(struct io_ring_ctx *ctx) |
2b188cc1 JA |
12012 | { |
12013 | struct file *file; | |
9faadcc8 | 12014 | #if defined(CONFIG_UNIX) |
2b188cc1 JA |
12015 | int ret; |
12016 | ||
2b188cc1 JA |
12017 | ret = sock_create_kern(&init_net, PF_UNIX, SOCK_RAW, IPPROTO_IP, |
12018 | &ctx->ring_sock); | |
12019 | if (ret) | |
9faadcc8 | 12020 | return ERR_PTR(ret); |
2b188cc1 JA |
12021 | #endif |
12022 | ||
91a9ab7c PM |
12023 | file = anon_inode_getfile_secure("[io_uring]", &io_uring_fops, ctx, |
12024 | O_RDWR | O_CLOEXEC, NULL); | |
2b188cc1 | 12025 | #if defined(CONFIG_UNIX) |
9faadcc8 PB |
12026 | if (IS_ERR(file)) { |
12027 | sock_release(ctx->ring_sock); | |
12028 | ctx->ring_sock = NULL; | |
12029 | } else { | |
12030 | ctx->ring_sock->file = file; | |
0f212204 | 12031 | } |
2b188cc1 | 12032 | #endif |
9faadcc8 | 12033 | return file; |
2b188cc1 JA |
12034 | } |
12035 | ||
c072481d PB |
12036 | static __cold int io_uring_create(unsigned entries, struct io_uring_params *p, |
12037 | struct io_uring_params __user *params) | |
2b188cc1 | 12038 | { |
2b188cc1 | 12039 | struct io_ring_ctx *ctx; |
9faadcc8 | 12040 | struct file *file; |
2b188cc1 JA |
12041 | int ret; |
12042 | ||
8110c1a6 | 12043 | if (!entries) |
2b188cc1 | 12044 | return -EINVAL; |
8110c1a6 JA |
12045 | if (entries > IORING_MAX_ENTRIES) { |
12046 | if (!(p->flags & IORING_SETUP_CLAMP)) | |
12047 | return -EINVAL; | |
12048 | entries = IORING_MAX_ENTRIES; | |
12049 | } | |
2b188cc1 JA |
12050 | |
12051 | /* | |
12052 | * Use twice as many entries for the CQ ring. It's possible for the | |
12053 | * application to drive a higher depth than the size of the SQ ring, | |
12054 | * since the sqes are only used at submission time. This allows for | |
33a107f0 JA |
12055 | * some flexibility in overcommitting a bit. If the application has |
12056 | * set IORING_SETUP_CQSIZE, it will have passed in the desired number | |
12057 | * of CQ ring entries manually. | |
2b188cc1 JA |
12058 | */ |
12059 | p->sq_entries = roundup_pow_of_two(entries); | |
33a107f0 JA |
12060 | if (p->flags & IORING_SETUP_CQSIZE) { |
12061 | /* | |
12062 | * If IORING_SETUP_CQSIZE is set, we do the same roundup | |
12063 | * to a power-of-two, if it isn't already. We do NOT impose | |
12064 | * any cq vs sq ring sizing. | |
12065 | */ | |
eb2667b3 | 12066 | if (!p->cq_entries) |
33a107f0 | 12067 | return -EINVAL; |
8110c1a6 JA |
12068 | if (p->cq_entries > IORING_MAX_CQ_ENTRIES) { |
12069 | if (!(p->flags & IORING_SETUP_CLAMP)) | |
12070 | return -EINVAL; | |
12071 | p->cq_entries = IORING_MAX_CQ_ENTRIES; | |
12072 | } | |
eb2667b3 JQ |
12073 | p->cq_entries = roundup_pow_of_two(p->cq_entries); |
12074 | if (p->cq_entries < p->sq_entries) | |
12075 | return -EINVAL; | |
33a107f0 JA |
12076 | } else { |
12077 | p->cq_entries = 2 * p->sq_entries; | |
12078 | } | |
2b188cc1 | 12079 | |
2b188cc1 | 12080 | ctx = io_ring_ctx_alloc(p); |
62e398be | 12081 | if (!ctx) |
2b188cc1 | 12082 | return -ENOMEM; |
773697b6 PB |
12083 | |
12084 | /* | |
12085 | * When SETUP_IOPOLL and SETUP_SQPOLL are both enabled, user | |
12086 | * space applications don't need to do io completion events | |
12087 | * polling again, they can rely on io_sq_thread to do polling | |
12088 | * work, which can reduce cpu usage and uring_lock contention. | |
12089 | */ | |
12090 | if (ctx->flags & IORING_SETUP_IOPOLL && | |
12091 | !(ctx->flags & IORING_SETUP_SQPOLL)) | |
12092 | ctx->syscall_iopoll = 1; | |
12093 | ||
2b188cc1 | 12094 | ctx->compat = in_compat_syscall(); |
62e398be JA |
12095 | if (!capable(CAP_IPC_LOCK)) |
12096 | ctx->user = get_uid(current_user()); | |
2aede0e4 | 12097 | |
9f010507 | 12098 | /* |
e1169f06 JA |
12099 | * For SQPOLL, we just need a wakeup, always. For !SQPOLL, if |
12100 | * COOP_TASKRUN is set, then IPIs are never needed by the app. | |
9f010507 | 12101 | */ |
e1169f06 JA |
12102 | ret = -EINVAL; |
12103 | if (ctx->flags & IORING_SETUP_SQPOLL) { | |
12104 | /* IPI related flags don't make sense with SQPOLL */ | |
ef060ea9 JA |
12105 | if (ctx->flags & (IORING_SETUP_COOP_TASKRUN | |
12106 | IORING_SETUP_TASKRUN_FLAG)) | |
e1169f06 | 12107 | goto err; |
9f010507 | 12108 | ctx->notify_method = TWA_SIGNAL_NO_IPI; |
e1169f06 JA |
12109 | } else if (ctx->flags & IORING_SETUP_COOP_TASKRUN) { |
12110 | ctx->notify_method = TWA_SIGNAL_NO_IPI; | |
12111 | } else { | |
ef060ea9 JA |
12112 | if (ctx->flags & IORING_SETUP_TASKRUN_FLAG) |
12113 | goto err; | |
9f010507 | 12114 | ctx->notify_method = TWA_SIGNAL; |
e1169f06 | 12115 | } |
9f010507 | 12116 | |
2aede0e4 JA |
12117 | /* |
12118 | * This is just grabbed for accounting purposes. When a process exits, | |
12119 | * the mm is exited and dropped before the files, hence we need to hang | |
12120 | * on to this mm purely for the purposes of being able to unaccount | |
12121 | * memory (locked/pinned vm). It's not used for anything else. | |
12122 | */ | |
6b7898eb | 12123 | mmgrab(current->mm); |
2aede0e4 | 12124 | ctx->mm_account = current->mm; |
6b7898eb | 12125 | |
2b188cc1 JA |
12126 | ret = io_allocate_scq_urings(ctx, p); |
12127 | if (ret) | |
12128 | goto err; | |
12129 | ||
7e84e1c7 | 12130 | ret = io_sq_offload_create(ctx, p); |
2b188cc1 JA |
12131 | if (ret) |
12132 | goto err; | |
eae071c9 | 12133 | /* always set a rsrc node */ |
47b228ce PB |
12134 | ret = io_rsrc_node_switch_start(ctx); |
12135 | if (ret) | |
12136 | goto err; | |
eae071c9 | 12137 | io_rsrc_node_switch(ctx, NULL); |
2b188cc1 | 12138 | |
2b188cc1 | 12139 | memset(&p->sq_off, 0, sizeof(p->sq_off)); |
75b28aff HV |
12140 | p->sq_off.head = offsetof(struct io_rings, sq.head); |
12141 | p->sq_off.tail = offsetof(struct io_rings, sq.tail); | |
12142 | p->sq_off.ring_mask = offsetof(struct io_rings, sq_ring_mask); | |
12143 | p->sq_off.ring_entries = offsetof(struct io_rings, sq_ring_entries); | |
12144 | p->sq_off.flags = offsetof(struct io_rings, sq_flags); | |
12145 | p->sq_off.dropped = offsetof(struct io_rings, sq_dropped); | |
12146 | p->sq_off.array = (char *)ctx->sq_array - (char *)ctx->rings; | |
2b188cc1 JA |
12147 | |
12148 | memset(&p->cq_off, 0, sizeof(p->cq_off)); | |
75b28aff HV |
12149 | p->cq_off.head = offsetof(struct io_rings, cq.head); |
12150 | p->cq_off.tail = offsetof(struct io_rings, cq.tail); | |
12151 | p->cq_off.ring_mask = offsetof(struct io_rings, cq_ring_mask); | |
12152 | p->cq_off.ring_entries = offsetof(struct io_rings, cq_ring_entries); | |
12153 | p->cq_off.overflow = offsetof(struct io_rings, cq_overflow); | |
12154 | p->cq_off.cqes = offsetof(struct io_rings, cqes); | |
0d9b5b3a | 12155 | p->cq_off.flags = offsetof(struct io_rings, cq_flags); |
ac90f249 | 12156 | |
7f13657d XW |
12157 | p->features = IORING_FEAT_SINGLE_MMAP | IORING_FEAT_NODROP | |
12158 | IORING_FEAT_SUBMIT_STABLE | IORING_FEAT_RW_CUR_POS | | |
5769a351 | 12159 | IORING_FEAT_CUR_PERSONALITY | IORING_FEAT_FAST_POLL | |
c73ebb68 | 12160 | IORING_FEAT_POLL_32BITS | IORING_FEAT_SQPOLL_NONFIXED | |
9690557e | 12161 | IORING_FEAT_EXT_ARG | IORING_FEAT_NATIVE_WORKERS | |
c4212f3e JA |
12162 | IORING_FEAT_RSRC_TAGS | IORING_FEAT_CQE_SKIP | |
12163 | IORING_FEAT_LINKED_FILE; | |
7f13657d XW |
12164 | |
12165 | if (copy_to_user(params, p, sizeof(*p))) { | |
12166 | ret = -EFAULT; | |
12167 | goto err; | |
12168 | } | |
d1719f70 | 12169 | |
9faadcc8 PB |
12170 | file = io_uring_get_file(ctx); |
12171 | if (IS_ERR(file)) { | |
12172 | ret = PTR_ERR(file); | |
12173 | goto err; | |
12174 | } | |
12175 | ||
044c1ab3 JA |
12176 | /* |
12177 | * Install ring fd as the very last thing, so we don't risk someone | |
12178 | * having closed it before we finish setup | |
12179 | */ | |
9faadcc8 PB |
12180 | ret = io_uring_install_fd(ctx, file); |
12181 | if (ret < 0) { | |
12182 | /* fput will clean it up */ | |
12183 | fput(file); | |
12184 | return ret; | |
12185 | } | |
044c1ab3 | 12186 | |
c826bd7a | 12187 | trace_io_uring_create(ret, ctx, p->sq_entries, p->cq_entries, p->flags); |
2b188cc1 JA |
12188 | return ret; |
12189 | err: | |
12190 | io_ring_ctx_wait_and_kill(ctx); | |
12191 | return ret; | |
12192 | } | |
12193 | ||
12194 | /* | |
12195 | * Sets up an aio uring context, and returns the fd. Applications asks for a | |
12196 | * ring size, we return the actual sq/cq ring sizes (among other things) in the | |
12197 | * params structure passed in. | |
12198 | */ | |
12199 | static long io_uring_setup(u32 entries, struct io_uring_params __user *params) | |
12200 | { | |
12201 | struct io_uring_params p; | |
2b188cc1 JA |
12202 | int i; |
12203 | ||
12204 | if (copy_from_user(&p, params, sizeof(p))) | |
12205 | return -EFAULT; | |
12206 | for (i = 0; i < ARRAY_SIZE(p.resv); i++) { | |
12207 | if (p.resv[i]) | |
12208 | return -EINVAL; | |
12209 | } | |
12210 | ||
6c271ce2 | 12211 | if (p.flags & ~(IORING_SETUP_IOPOLL | IORING_SETUP_SQPOLL | |
8110c1a6 | 12212 | IORING_SETUP_SQ_AFF | IORING_SETUP_CQSIZE | |
7e84e1c7 | 12213 | IORING_SETUP_CLAMP | IORING_SETUP_ATTACH_WQ | |
e1169f06 | 12214 | IORING_SETUP_R_DISABLED | IORING_SETUP_SUBMIT_ALL | |
ebdeb7c0 | 12215 | IORING_SETUP_COOP_TASKRUN | IORING_SETUP_TASKRUN_FLAG | |
76c68fbf | 12216 | IORING_SETUP_SQE128 | IORING_SETUP_CQE32)) |
2b188cc1 JA |
12217 | return -EINVAL; |
12218 | ||
ef060ea9 | 12219 | return io_uring_create(entries, &p, params); |
2b188cc1 JA |
12220 | } |
12221 | ||
12222 | SYSCALL_DEFINE2(io_uring_setup, u32, entries, | |
12223 | struct io_uring_params __user *, params) | |
12224 | { | |
12225 | return io_uring_setup(entries, params); | |
12226 | } | |
12227 | ||
c072481d PB |
12228 | static __cold int io_probe(struct io_ring_ctx *ctx, void __user *arg, |
12229 | unsigned nr_args) | |
66f4af93 JA |
12230 | { |
12231 | struct io_uring_probe *p; | |
12232 | size_t size; | |
12233 | int i, ret; | |
12234 | ||
12235 | size = struct_size(p, ops, nr_args); | |
12236 | if (size == SIZE_MAX) | |
12237 | return -EOVERFLOW; | |
12238 | p = kzalloc(size, GFP_KERNEL); | |
12239 | if (!p) | |
12240 | return -ENOMEM; | |
12241 | ||
12242 | ret = -EFAULT; | |
12243 | if (copy_from_user(p, arg, size)) | |
12244 | goto out; | |
12245 | ret = -EINVAL; | |
12246 | if (memchr_inv(p, 0, size)) | |
12247 | goto out; | |
12248 | ||
12249 | p->last_op = IORING_OP_LAST - 1; | |
12250 | if (nr_args > IORING_OP_LAST) | |
12251 | nr_args = IORING_OP_LAST; | |
12252 | ||
12253 | for (i = 0; i < nr_args; i++) { | |
12254 | p->ops[i].op = i; | |
12255 | if (!io_op_defs[i].not_supported) | |
12256 | p->ops[i].flags = IO_URING_OP_SUPPORTED; | |
12257 | } | |
12258 | p->ops_len = i; | |
12259 | ||
12260 | ret = 0; | |
12261 | if (copy_to_user(arg, p, size)) | |
12262 | ret = -EFAULT; | |
12263 | out: | |
12264 | kfree(p); | |
12265 | return ret; | |
12266 | } | |
12267 | ||
071698e1 JA |
12268 | static int io_register_personality(struct io_ring_ctx *ctx) |
12269 | { | |
4379bf8b | 12270 | const struct cred *creds; |
61cf9370 | 12271 | u32 id; |
1e6fa521 | 12272 | int ret; |
071698e1 | 12273 | |
4379bf8b | 12274 | creds = get_current_cred(); |
1e6fa521 | 12275 | |
61cf9370 MWO |
12276 | ret = xa_alloc_cyclic(&ctx->personalities, &id, (void *)creds, |
12277 | XA_LIMIT(0, USHRT_MAX), &ctx->pers_next, GFP_KERNEL); | |
a30f895a JA |
12278 | if (ret < 0) { |
12279 | put_cred(creds); | |
12280 | return ret; | |
12281 | } | |
12282 | return id; | |
071698e1 JA |
12283 | } |
12284 | ||
c072481d PB |
12285 | static __cold int io_register_restrictions(struct io_ring_ctx *ctx, |
12286 | void __user *arg, unsigned int nr_args) | |
21b55dbc SG |
12287 | { |
12288 | struct io_uring_restriction *res; | |
12289 | size_t size; | |
12290 | int i, ret; | |
12291 | ||
7e84e1c7 SG |
12292 | /* Restrictions allowed only if rings started disabled */ |
12293 | if (!(ctx->flags & IORING_SETUP_R_DISABLED)) | |
12294 | return -EBADFD; | |
12295 | ||
21b55dbc | 12296 | /* We allow only a single restrictions registration */ |
7e84e1c7 | 12297 | if (ctx->restrictions.registered) |
21b55dbc SG |
12298 | return -EBUSY; |
12299 | ||
12300 | if (!arg || nr_args > IORING_MAX_RESTRICTIONS) | |
12301 | return -EINVAL; | |
12302 | ||
12303 | size = array_size(nr_args, sizeof(*res)); | |
12304 | if (size == SIZE_MAX) | |
12305 | return -EOVERFLOW; | |
12306 | ||
12307 | res = memdup_user(arg, size); | |
12308 | if (IS_ERR(res)) | |
12309 | return PTR_ERR(res); | |
12310 | ||
12311 | ret = 0; | |
12312 | ||
12313 | for (i = 0; i < nr_args; i++) { | |
12314 | switch (res[i].opcode) { | |
12315 | case IORING_RESTRICTION_REGISTER_OP: | |
12316 | if (res[i].register_op >= IORING_REGISTER_LAST) { | |
12317 | ret = -EINVAL; | |
12318 | goto out; | |
12319 | } | |
12320 | ||
12321 | __set_bit(res[i].register_op, | |
12322 | ctx->restrictions.register_op); | |
12323 | break; | |
12324 | case IORING_RESTRICTION_SQE_OP: | |
12325 | if (res[i].sqe_op >= IORING_OP_LAST) { | |
12326 | ret = -EINVAL; | |
12327 | goto out; | |
12328 | } | |
12329 | ||
12330 | __set_bit(res[i].sqe_op, ctx->restrictions.sqe_op); | |
12331 | break; | |
12332 | case IORING_RESTRICTION_SQE_FLAGS_ALLOWED: | |
12333 | ctx->restrictions.sqe_flags_allowed = res[i].sqe_flags; | |
12334 | break; | |
12335 | case IORING_RESTRICTION_SQE_FLAGS_REQUIRED: | |
12336 | ctx->restrictions.sqe_flags_required = res[i].sqe_flags; | |
12337 | break; | |
12338 | default: | |
12339 | ret = -EINVAL; | |
12340 | goto out; | |
12341 | } | |
12342 | } | |
12343 | ||
12344 | out: | |
12345 | /* Reset all restrictions if an error happened */ | |
12346 | if (ret != 0) | |
12347 | memset(&ctx->restrictions, 0, sizeof(ctx->restrictions)); | |
12348 | else | |
7e84e1c7 | 12349 | ctx->restrictions.registered = true; |
21b55dbc SG |
12350 | |
12351 | kfree(res); | |
12352 | return ret; | |
12353 | } | |
12354 | ||
7e84e1c7 SG |
12355 | static int io_register_enable_rings(struct io_ring_ctx *ctx) |
12356 | { | |
12357 | if (!(ctx->flags & IORING_SETUP_R_DISABLED)) | |
12358 | return -EBADFD; | |
12359 | ||
12360 | if (ctx->restrictions.registered) | |
12361 | ctx->restricted = 1; | |
12362 | ||
0298ef96 PB |
12363 | ctx->flags &= ~IORING_SETUP_R_DISABLED; |
12364 | if (ctx->sq_data && wq_has_sleeper(&ctx->sq_data->wait)) | |
12365 | wake_up(&ctx->sq_data->wait); | |
7e84e1c7 SG |
12366 | return 0; |
12367 | } | |
12368 | ||
fdecb662 | 12369 | static int __io_register_rsrc_update(struct io_ring_ctx *ctx, unsigned type, |
c3bdad02 | 12370 | struct io_uring_rsrc_update2 *up, |
98f0b3b4 PB |
12371 | unsigned nr_args) |
12372 | { | |
12373 | __u32 tmp; | |
12374 | int err; | |
12375 | ||
12376 | if (check_add_overflow(up->offset, nr_args, &tmp)) | |
12377 | return -EOVERFLOW; | |
12378 | err = io_rsrc_node_switch_start(ctx); | |
12379 | if (err) | |
12380 | return err; | |
12381 | ||
fdecb662 PB |
12382 | switch (type) { |
12383 | case IORING_RSRC_FILE: | |
98f0b3b4 | 12384 | return __io_sqe_files_update(ctx, up, nr_args); |
634d00df PB |
12385 | case IORING_RSRC_BUFFER: |
12386 | return __io_sqe_buffers_update(ctx, up, nr_args); | |
98f0b3b4 PB |
12387 | } |
12388 | return -EINVAL; | |
12389 | } | |
12390 | ||
c3bdad02 PB |
12391 | static int io_register_files_update(struct io_ring_ctx *ctx, void __user *arg, |
12392 | unsigned nr_args) | |
98f0b3b4 | 12393 | { |
c3bdad02 | 12394 | struct io_uring_rsrc_update2 up; |
98f0b3b4 PB |
12395 | |
12396 | if (!nr_args) | |
12397 | return -EINVAL; | |
c3bdad02 PB |
12398 | memset(&up, 0, sizeof(up)); |
12399 | if (copy_from_user(&up, arg, sizeof(struct io_uring_rsrc_update))) | |
12400 | return -EFAULT; | |
d8a3ba9c | 12401 | if (up.resv || up.resv2) |
565c5e61 | 12402 | return -EINVAL; |
c3bdad02 PB |
12403 | return __io_register_rsrc_update(ctx, IORING_RSRC_FILE, &up, nr_args); |
12404 | } | |
12405 | ||
12406 | static int io_register_rsrc_update(struct io_ring_ctx *ctx, void __user *arg, | |
992da01a | 12407 | unsigned size, unsigned type) |
c3bdad02 PB |
12408 | { |
12409 | struct io_uring_rsrc_update2 up; | |
12410 | ||
12411 | if (size != sizeof(up)) | |
12412 | return -EINVAL; | |
98f0b3b4 PB |
12413 | if (copy_from_user(&up, arg, sizeof(up))) |
12414 | return -EFAULT; | |
d8a3ba9c | 12415 | if (!up.nr || up.resv || up.resv2) |
98f0b3b4 | 12416 | return -EINVAL; |
992da01a | 12417 | return __io_register_rsrc_update(ctx, type, &up, up.nr); |
98f0b3b4 PB |
12418 | } |
12419 | ||
c072481d | 12420 | static __cold int io_register_rsrc(struct io_ring_ctx *ctx, void __user *arg, |
992da01a | 12421 | unsigned int size, unsigned int type) |
792e3582 PB |
12422 | { |
12423 | struct io_uring_rsrc_register rr; | |
12424 | ||
12425 | /* keep it extendible */ | |
12426 | if (size != sizeof(rr)) | |
12427 | return -EINVAL; | |
12428 | ||
12429 | memset(&rr, 0, sizeof(rr)); | |
12430 | if (copy_from_user(&rr, arg, size)) | |
12431 | return -EFAULT; | |
992da01a | 12432 | if (!rr.nr || rr.resv || rr.resv2) |
792e3582 PB |
12433 | return -EINVAL; |
12434 | ||
992da01a | 12435 | switch (type) { |
792e3582 PB |
12436 | case IORING_RSRC_FILE: |
12437 | return io_sqe_files_register(ctx, u64_to_user_ptr(rr.data), | |
12438 | rr.nr, u64_to_user_ptr(rr.tags)); | |
634d00df PB |
12439 | case IORING_RSRC_BUFFER: |
12440 | return io_sqe_buffers_register(ctx, u64_to_user_ptr(rr.data), | |
12441 | rr.nr, u64_to_user_ptr(rr.tags)); | |
792e3582 PB |
12442 | } |
12443 | return -EINVAL; | |
12444 | } | |
12445 | ||
c072481d PB |
12446 | static __cold int io_register_iowq_aff(struct io_ring_ctx *ctx, |
12447 | void __user *arg, unsigned len) | |
fe76421d JA |
12448 | { |
12449 | struct io_uring_task *tctx = current->io_uring; | |
12450 | cpumask_var_t new_mask; | |
12451 | int ret; | |
12452 | ||
12453 | if (!tctx || !tctx->io_wq) | |
12454 | return -EINVAL; | |
12455 | ||
12456 | if (!alloc_cpumask_var(&new_mask, GFP_KERNEL)) | |
12457 | return -ENOMEM; | |
12458 | ||
12459 | cpumask_clear(new_mask); | |
12460 | if (len > cpumask_size()) | |
12461 | len = cpumask_size(); | |
12462 | ||
0f5e4b83 ES |
12463 | if (in_compat_syscall()) { |
12464 | ret = compat_get_bitmap(cpumask_bits(new_mask), | |
12465 | (const compat_ulong_t __user *)arg, | |
12466 | len * 8 /* CHAR_BIT */); | |
12467 | } else { | |
12468 | ret = copy_from_user(new_mask, arg, len); | |
12469 | } | |
12470 | ||
12471 | if (ret) { | |
fe76421d JA |
12472 | free_cpumask_var(new_mask); |
12473 | return -EFAULT; | |
12474 | } | |
12475 | ||
12476 | ret = io_wq_cpu_affinity(tctx->io_wq, new_mask); | |
12477 | free_cpumask_var(new_mask); | |
12478 | return ret; | |
12479 | } | |
12480 | ||
c072481d | 12481 | static __cold int io_unregister_iowq_aff(struct io_ring_ctx *ctx) |
fe76421d JA |
12482 | { |
12483 | struct io_uring_task *tctx = current->io_uring; | |
12484 | ||
12485 | if (!tctx || !tctx->io_wq) | |
12486 | return -EINVAL; | |
12487 | ||
12488 | return io_wq_cpu_affinity(tctx->io_wq, NULL); | |
12489 | } | |
12490 | ||
c072481d PB |
12491 | static __cold int io_register_iowq_max_workers(struct io_ring_ctx *ctx, |
12492 | void __user *arg) | |
b22fa62a | 12493 | __must_hold(&ctx->uring_lock) |
2e480058 | 12494 | { |
b22fa62a | 12495 | struct io_tctx_node *node; |
fa84693b JA |
12496 | struct io_uring_task *tctx = NULL; |
12497 | struct io_sq_data *sqd = NULL; | |
2e480058 JA |
12498 | __u32 new_count[2]; |
12499 | int i, ret; | |
12500 | ||
2e480058 JA |
12501 | if (copy_from_user(new_count, arg, sizeof(new_count))) |
12502 | return -EFAULT; | |
12503 | for (i = 0; i < ARRAY_SIZE(new_count); i++) | |
12504 | if (new_count[i] > INT_MAX) | |
12505 | return -EINVAL; | |
12506 | ||
fa84693b JA |
12507 | if (ctx->flags & IORING_SETUP_SQPOLL) { |
12508 | sqd = ctx->sq_data; | |
12509 | if (sqd) { | |
009ad9f0 JA |
12510 | /* |
12511 | * Observe the correct sqd->lock -> ctx->uring_lock | |
12512 | * ordering. Fine to drop uring_lock here, we hold | |
12513 | * a ref to the ctx. | |
12514 | */ | |
41d3a6bd | 12515 | refcount_inc(&sqd->refs); |
009ad9f0 | 12516 | mutex_unlock(&ctx->uring_lock); |
fa84693b | 12517 | mutex_lock(&sqd->lock); |
009ad9f0 | 12518 | mutex_lock(&ctx->uring_lock); |
41d3a6bd JA |
12519 | if (sqd->thread) |
12520 | tctx = sqd->thread->io_uring; | |
fa84693b JA |
12521 | } |
12522 | } else { | |
12523 | tctx = current->io_uring; | |
12524 | } | |
12525 | ||
e139a1ec | 12526 | BUILD_BUG_ON(sizeof(new_count) != sizeof(ctx->iowq_limits)); |
fa84693b | 12527 | |
bad119b9 PB |
12528 | for (i = 0; i < ARRAY_SIZE(new_count); i++) |
12529 | if (new_count[i]) | |
12530 | ctx->iowq_limits[i] = new_count[i]; | |
e139a1ec PB |
12531 | ctx->iowq_limits_set = true; |
12532 | ||
e139a1ec PB |
12533 | if (tctx && tctx->io_wq) { |
12534 | ret = io_wq_max_workers(tctx->io_wq, new_count); | |
12535 | if (ret) | |
12536 | goto err; | |
12537 | } else { | |
12538 | memset(new_count, 0, sizeof(new_count)); | |
12539 | } | |
fa84693b | 12540 | |
41d3a6bd | 12541 | if (sqd) { |
fa84693b | 12542 | mutex_unlock(&sqd->lock); |
41d3a6bd JA |
12543 | io_put_sq_data(sqd); |
12544 | } | |
2e480058 JA |
12545 | |
12546 | if (copy_to_user(arg, new_count, sizeof(new_count))) | |
12547 | return -EFAULT; | |
12548 | ||
b22fa62a PB |
12549 | /* that's it for SQPOLL, only the SQPOLL task creates requests */ |
12550 | if (sqd) | |
12551 | return 0; | |
12552 | ||
12553 | /* now propagate the restriction to all registered users */ | |
12554 | list_for_each_entry(node, &ctx->tctx_list, ctx_node) { | |
12555 | struct io_uring_task *tctx = node->task->io_uring; | |
12556 | ||
12557 | if (WARN_ON_ONCE(!tctx->io_wq)) | |
12558 | continue; | |
12559 | ||
12560 | for (i = 0; i < ARRAY_SIZE(new_count); i++) | |
12561 | new_count[i] = ctx->iowq_limits[i]; | |
12562 | /* ignore errors, it always returns zero anyway */ | |
12563 | (void)io_wq_max_workers(tctx->io_wq, new_count); | |
12564 | } | |
2e480058 | 12565 | return 0; |
fa84693b | 12566 | err: |
41d3a6bd | 12567 | if (sqd) { |
fa84693b | 12568 | mutex_unlock(&sqd->lock); |
41d3a6bd JA |
12569 | io_put_sq_data(sqd); |
12570 | } | |
fa84693b | 12571 | return ret; |
2e480058 JA |
12572 | } |
12573 | ||
edafccee JA |
12574 | static int __io_uring_register(struct io_ring_ctx *ctx, unsigned opcode, |
12575 | void __user *arg, unsigned nr_args) | |
b19062a5 JA |
12576 | __releases(ctx->uring_lock) |
12577 | __acquires(ctx->uring_lock) | |
edafccee JA |
12578 | { |
12579 | int ret; | |
12580 | ||
35fa71a0 JA |
12581 | /* |
12582 | * We're inside the ring mutex, if the ref is already dying, then | |
12583 | * someone else killed the ctx or is already going through | |
12584 | * io_uring_register(). | |
12585 | */ | |
12586 | if (percpu_ref_is_dying(&ctx->refs)) | |
12587 | return -ENXIO; | |
12588 | ||
75c4021a PB |
12589 | if (ctx->restricted) { |
12590 | if (opcode >= IORING_REGISTER_LAST) | |
12591 | return -EINVAL; | |
12592 | opcode = array_index_nospec(opcode, IORING_REGISTER_LAST); | |
12593 | if (!test_bit(opcode, ctx->restrictions.register_op)) | |
12594 | return -EACCES; | |
12595 | } | |
12596 | ||
edafccee JA |
12597 | switch (opcode) { |
12598 | case IORING_REGISTER_BUFFERS: | |
634d00df | 12599 | ret = io_sqe_buffers_register(ctx, arg, nr_args, NULL); |
edafccee JA |
12600 | break; |
12601 | case IORING_UNREGISTER_BUFFERS: | |
12602 | ret = -EINVAL; | |
12603 | if (arg || nr_args) | |
12604 | break; | |
0a96bbe4 | 12605 | ret = io_sqe_buffers_unregister(ctx); |
edafccee | 12606 | break; |
6b06314c | 12607 | case IORING_REGISTER_FILES: |
792e3582 | 12608 | ret = io_sqe_files_register(ctx, arg, nr_args, NULL); |
6b06314c JA |
12609 | break; |
12610 | case IORING_UNREGISTER_FILES: | |
12611 | ret = -EINVAL; | |
12612 | if (arg || nr_args) | |
12613 | break; | |
12614 | ret = io_sqe_files_unregister(ctx); | |
12615 | break; | |
c3a31e60 | 12616 | case IORING_REGISTER_FILES_UPDATE: |
c3bdad02 | 12617 | ret = io_register_files_update(ctx, arg, nr_args); |
c3a31e60 | 12618 | break; |
9b402849 JA |
12619 | case IORING_REGISTER_EVENTFD: |
12620 | ret = -EINVAL; | |
12621 | if (nr_args != 1) | |
12622 | break; | |
c75312dd UA |
12623 | ret = io_eventfd_register(ctx, arg, 0); |
12624 | break; | |
12625 | case IORING_REGISTER_EVENTFD_ASYNC: | |
12626 | ret = -EINVAL; | |
12627 | if (nr_args != 1) | |
f2842ab5 | 12628 | break; |
c75312dd | 12629 | ret = io_eventfd_register(ctx, arg, 1); |
9b402849 JA |
12630 | break; |
12631 | case IORING_UNREGISTER_EVENTFD: | |
12632 | ret = -EINVAL; | |
12633 | if (arg || nr_args) | |
12634 | break; | |
12635 | ret = io_eventfd_unregister(ctx); | |
12636 | break; | |
66f4af93 JA |
12637 | case IORING_REGISTER_PROBE: |
12638 | ret = -EINVAL; | |
12639 | if (!arg || nr_args > 256) | |
12640 | break; | |
12641 | ret = io_probe(ctx, arg, nr_args); | |
12642 | break; | |
071698e1 JA |
12643 | case IORING_REGISTER_PERSONALITY: |
12644 | ret = -EINVAL; | |
12645 | if (arg || nr_args) | |
12646 | break; | |
12647 | ret = io_register_personality(ctx); | |
12648 | break; | |
12649 | case IORING_UNREGISTER_PERSONALITY: | |
12650 | ret = -EINVAL; | |
12651 | if (arg) | |
12652 | break; | |
12653 | ret = io_unregister_personality(ctx, nr_args); | |
12654 | break; | |
7e84e1c7 SG |
12655 | case IORING_REGISTER_ENABLE_RINGS: |
12656 | ret = -EINVAL; | |
12657 | if (arg || nr_args) | |
12658 | break; | |
12659 | ret = io_register_enable_rings(ctx); | |
12660 | break; | |
21b55dbc SG |
12661 | case IORING_REGISTER_RESTRICTIONS: |
12662 | ret = io_register_restrictions(ctx, arg, nr_args); | |
12663 | break; | |
992da01a PB |
12664 | case IORING_REGISTER_FILES2: |
12665 | ret = io_register_rsrc(ctx, arg, nr_args, IORING_RSRC_FILE); | |
12666 | break; | |
12667 | case IORING_REGISTER_FILES_UPDATE2: | |
12668 | ret = io_register_rsrc_update(ctx, arg, nr_args, | |
12669 | IORING_RSRC_FILE); | |
12670 | break; | |
12671 | case IORING_REGISTER_BUFFERS2: | |
12672 | ret = io_register_rsrc(ctx, arg, nr_args, IORING_RSRC_BUFFER); | |
792e3582 | 12673 | break; |
992da01a PB |
12674 | case IORING_REGISTER_BUFFERS_UPDATE: |
12675 | ret = io_register_rsrc_update(ctx, arg, nr_args, | |
12676 | IORING_RSRC_BUFFER); | |
c3bdad02 | 12677 | break; |
fe76421d JA |
12678 | case IORING_REGISTER_IOWQ_AFF: |
12679 | ret = -EINVAL; | |
12680 | if (!arg || !nr_args) | |
12681 | break; | |
12682 | ret = io_register_iowq_aff(ctx, arg, nr_args); | |
12683 | break; | |
12684 | case IORING_UNREGISTER_IOWQ_AFF: | |
12685 | ret = -EINVAL; | |
12686 | if (arg || nr_args) | |
12687 | break; | |
12688 | ret = io_unregister_iowq_aff(ctx); | |
12689 | break; | |
2e480058 JA |
12690 | case IORING_REGISTER_IOWQ_MAX_WORKERS: |
12691 | ret = -EINVAL; | |
12692 | if (!arg || nr_args != 2) | |
12693 | break; | |
12694 | ret = io_register_iowq_max_workers(ctx, arg); | |
12695 | break; | |
e7a6c00d JA |
12696 | case IORING_REGISTER_RING_FDS: |
12697 | ret = io_ringfd_register(ctx, arg, nr_args); | |
12698 | break; | |
12699 | case IORING_UNREGISTER_RING_FDS: | |
12700 | ret = io_ringfd_unregister(ctx, arg, nr_args); | |
12701 | break; | |
edafccee JA |
12702 | default: |
12703 | ret = -EINVAL; | |
12704 | break; | |
12705 | } | |
12706 | ||
edafccee JA |
12707 | return ret; |
12708 | } | |
12709 | ||
12710 | SYSCALL_DEFINE4(io_uring_register, unsigned int, fd, unsigned int, opcode, | |
12711 | void __user *, arg, unsigned int, nr_args) | |
12712 | { | |
12713 | struct io_ring_ctx *ctx; | |
12714 | long ret = -EBADF; | |
12715 | struct fd f; | |
12716 | ||
12717 | f = fdget(fd); | |
12718 | if (!f.file) | |
12719 | return -EBADF; | |
12720 | ||
12721 | ret = -EOPNOTSUPP; | |
12722 | if (f.file->f_op != &io_uring_fops) | |
12723 | goto out_fput; | |
12724 | ||
12725 | ctx = f.file->private_data; | |
12726 | ||
b6c23dd5 PB |
12727 | io_run_task_work(); |
12728 | ||
edafccee JA |
12729 | mutex_lock(&ctx->uring_lock); |
12730 | ret = __io_uring_register(ctx, opcode, arg, nr_args); | |
12731 | mutex_unlock(&ctx->uring_lock); | |
2757be22 | 12732 | trace_io_uring_register(ctx, opcode, ctx->nr_user_files, ctx->nr_user_bufs, ret); |
edafccee JA |
12733 | out_fput: |
12734 | fdput(f); | |
12735 | return ret; | |
12736 | } | |
12737 | ||
2b188cc1 JA |
12738 | static int __init io_uring_init(void) |
12739 | { | |
d7f62e82 SM |
12740 | #define __BUILD_BUG_VERIFY_ELEMENT(stype, eoffset, etype, ename) do { \ |
12741 | BUILD_BUG_ON(offsetof(stype, ename) != eoffset); \ | |
12742 | BUILD_BUG_ON(sizeof(etype) != sizeof_field(stype, ename)); \ | |
12743 | } while (0) | |
12744 | ||
12745 | #define BUILD_BUG_SQE_ELEM(eoffset, etype, ename) \ | |
12746 | __BUILD_BUG_VERIFY_ELEMENT(struct io_uring_sqe, eoffset, etype, ename) | |
12747 | BUILD_BUG_ON(sizeof(struct io_uring_sqe) != 64); | |
12748 | BUILD_BUG_SQE_ELEM(0, __u8, opcode); | |
12749 | BUILD_BUG_SQE_ELEM(1, __u8, flags); | |
12750 | BUILD_BUG_SQE_ELEM(2, __u16, ioprio); | |
12751 | BUILD_BUG_SQE_ELEM(4, __s32, fd); | |
12752 | BUILD_BUG_SQE_ELEM(8, __u64, off); | |
12753 | BUILD_BUG_SQE_ELEM(8, __u64, addr2); | |
12754 | BUILD_BUG_SQE_ELEM(16, __u64, addr); | |
7d67af2c | 12755 | BUILD_BUG_SQE_ELEM(16, __u64, splice_off_in); |
d7f62e82 SM |
12756 | BUILD_BUG_SQE_ELEM(24, __u32, len); |
12757 | BUILD_BUG_SQE_ELEM(28, __kernel_rwf_t, rw_flags); | |
12758 | BUILD_BUG_SQE_ELEM(28, /* compat */ int, rw_flags); | |
12759 | BUILD_BUG_SQE_ELEM(28, /* compat */ __u32, rw_flags); | |
12760 | BUILD_BUG_SQE_ELEM(28, __u32, fsync_flags); | |
5769a351 JX |
12761 | BUILD_BUG_SQE_ELEM(28, /* compat */ __u16, poll_events); |
12762 | BUILD_BUG_SQE_ELEM(28, __u32, poll32_events); | |
d7f62e82 SM |
12763 | BUILD_BUG_SQE_ELEM(28, __u32, sync_range_flags); |
12764 | BUILD_BUG_SQE_ELEM(28, __u32, msg_flags); | |
12765 | BUILD_BUG_SQE_ELEM(28, __u32, timeout_flags); | |
12766 | BUILD_BUG_SQE_ELEM(28, __u32, accept_flags); | |
12767 | BUILD_BUG_SQE_ELEM(28, __u32, cancel_flags); | |
12768 | BUILD_BUG_SQE_ELEM(28, __u32, open_flags); | |
12769 | BUILD_BUG_SQE_ELEM(28, __u32, statx_flags); | |
12770 | BUILD_BUG_SQE_ELEM(28, __u32, fadvise_advice); | |
7d67af2c | 12771 | BUILD_BUG_SQE_ELEM(28, __u32, splice_flags); |
d7f62e82 SM |
12772 | BUILD_BUG_SQE_ELEM(32, __u64, user_data); |
12773 | BUILD_BUG_SQE_ELEM(40, __u16, buf_index); | |
16340eab | 12774 | BUILD_BUG_SQE_ELEM(40, __u16, buf_group); |
d7f62e82 | 12775 | BUILD_BUG_SQE_ELEM(42, __u16, personality); |
7d67af2c | 12776 | BUILD_BUG_SQE_ELEM(44, __s32, splice_fd_in); |
b9445598 | 12777 | BUILD_BUG_SQE_ELEM(44, __u32, file_index); |
e9621e2b | 12778 | BUILD_BUG_SQE_ELEM(48, __u64, addr3); |
d7f62e82 | 12779 | |
b0d658ec PB |
12780 | BUILD_BUG_ON(sizeof(struct io_uring_files_update) != |
12781 | sizeof(struct io_uring_rsrc_update)); | |
12782 | BUILD_BUG_ON(sizeof(struct io_uring_rsrc_update) > | |
12783 | sizeof(struct io_uring_rsrc_update2)); | |
90499ad0 PB |
12784 | |
12785 | /* ->buf_index is u16 */ | |
12786 | BUILD_BUG_ON(IORING_MAX_REG_BUFFERS >= (1u << 16)); | |
9cfc7e94 | 12787 | BUILD_BUG_ON(BGID_ARRAY * sizeof(struct io_buffer_list) > PAGE_SIZE); |
90499ad0 | 12788 | |
b0d658ec PB |
12789 | /* should fit into one byte */ |
12790 | BUILD_BUG_ON(SQE_VALID_FLAGS >= (1 << 8)); | |
68fe256a PB |
12791 | BUILD_BUG_ON(SQE_COMMON_FLAGS >= (1 << 8)); |
12792 | BUILD_BUG_ON((SQE_VALID_FLAGS | SQE_COMMON_FLAGS) != SQE_VALID_FLAGS); | |
b0d658ec | 12793 | |
d3656344 | 12794 | BUILD_BUG_ON(ARRAY_SIZE(io_op_defs) != IORING_OP_LAST); |
32c2d33e | 12795 | BUILD_BUG_ON(__REQ_F_LAST_BIT > 8 * sizeof(int)); |
16340eab | 12796 | |
3a4b89a2 JA |
12797 | BUILD_BUG_ON(sizeof(atomic_t) != sizeof(u32)); |
12798 | ||
ee692a21 JA |
12799 | BUILD_BUG_ON(sizeof(struct io_uring_cmd) > 64); |
12800 | ||
91f245d5 JA |
12801 | req_cachep = KMEM_CACHE(io_kiocb, SLAB_HWCACHE_ALIGN | SLAB_PANIC | |
12802 | SLAB_ACCOUNT); | |
2b188cc1 JA |
12803 | return 0; |
12804 | }; | |
12805 | __initcall(io_uring_init); |