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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> |
2b188cc1 | 83 | |
c826bd7a DD |
84 | #define CREATE_TRACE_POINTS |
85 | #include <trace/events/io_uring.h> | |
86 | ||
2b188cc1 JA |
87 | #include <uapi/linux/io_uring.h> |
88 | ||
89 | #include "internal.h" | |
561fb04a | 90 | #include "io-wq.h" |
2b188cc1 | 91 | |
5277deaa | 92 | #define IORING_MAX_ENTRIES 32768 |
33a107f0 | 93 | #define IORING_MAX_CQ_ENTRIES (2 * IORING_MAX_ENTRIES) |
4ce8ad95 | 94 | #define IORING_SQPOLL_CAP_ENTRIES_VALUE 8 |
65e19f54 | 95 | |
187f08c1 | 96 | /* only define max */ |
042b0d85 | 97 | #define IORING_MAX_FIXED_FILES (1U << 15) |
21b55dbc SG |
98 | #define IORING_MAX_RESTRICTIONS (IORING_RESTRICTION_LAST + \ |
99 | IORING_REGISTER_LAST + IORING_OP_LAST) | |
2b188cc1 | 100 | |
187f08c1 | 101 | #define IO_RSRC_TAG_TABLE_SHIFT (PAGE_SHIFT - 3) |
2d091d62 PB |
102 | #define IO_RSRC_TAG_TABLE_MAX (1U << IO_RSRC_TAG_TABLE_SHIFT) |
103 | #define IO_RSRC_TAG_TABLE_MASK (IO_RSRC_TAG_TABLE_MAX - 1) | |
104 | ||
489809e2 PB |
105 | #define IORING_MAX_REG_BUFFERS (1U << 14) |
106 | ||
68fe256a PB |
107 | #define SQE_COMMON_FLAGS (IOSQE_FIXED_FILE | IOSQE_IO_LINK | \ |
108 | IOSQE_IO_HARDLINK | IOSQE_ASYNC) | |
109 | ||
5562a8d7 PB |
110 | #define SQE_VALID_FLAGS (SQE_COMMON_FLAGS | IOSQE_BUFFER_SELECT | \ |
111 | IOSQE_IO_DRAIN | IOSQE_CQE_SKIP_SUCCESS) | |
68fe256a | 112 | |
c854357b | 113 | #define IO_REQ_CLEAN_FLAGS (REQ_F_BUFFER_SELECTED | REQ_F_NEED_CLEANUP | \ |
d5361233 | 114 | REQ_F_POLLED | REQ_F_CREDS | REQ_F_ASYNC_DATA) |
b16fed66 | 115 | |
a538be5b PB |
116 | #define IO_REQ_CLEAN_SLOW_FLAGS (REQ_F_REFCOUNT | REQ_F_LINK | REQ_F_HARDLINK |\ |
117 | IO_REQ_CLEAN_FLAGS) | |
118 | ||
09899b19 PB |
119 | #define IO_TCTX_REFS_CACHE_NR (1U << 10) |
120 | ||
2b188cc1 JA |
121 | struct io_uring { |
122 | u32 head ____cacheline_aligned_in_smp; | |
123 | u32 tail ____cacheline_aligned_in_smp; | |
124 | }; | |
125 | ||
1e84b97b | 126 | /* |
75b28aff HV |
127 | * This data is shared with the application through the mmap at offsets |
128 | * IORING_OFF_SQ_RING and IORING_OFF_CQ_RING. | |
1e84b97b SB |
129 | * |
130 | * The offsets to the member fields are published through struct | |
131 | * io_sqring_offsets when calling io_uring_setup. | |
132 | */ | |
75b28aff | 133 | struct io_rings { |
1e84b97b SB |
134 | /* |
135 | * Head and tail offsets into the ring; the offsets need to be | |
136 | * masked to get valid indices. | |
137 | * | |
75b28aff HV |
138 | * The kernel controls head of the sq ring and the tail of the cq ring, |
139 | * and the application controls tail of the sq ring and the head of the | |
140 | * cq ring. | |
1e84b97b | 141 | */ |
75b28aff | 142 | struct io_uring sq, cq; |
1e84b97b | 143 | /* |
75b28aff | 144 | * Bitmasks to apply to head and tail offsets (constant, equals |
1e84b97b SB |
145 | * ring_entries - 1) |
146 | */ | |
75b28aff HV |
147 | u32 sq_ring_mask, cq_ring_mask; |
148 | /* Ring sizes (constant, power of 2) */ | |
149 | u32 sq_ring_entries, cq_ring_entries; | |
1e84b97b SB |
150 | /* |
151 | * Number of invalid entries dropped by the kernel due to | |
152 | * invalid index stored in array | |
153 | * | |
154 | * Written by the kernel, shouldn't be modified by the | |
155 | * application (i.e. get number of "new events" by comparing to | |
156 | * cached value). | |
157 | * | |
158 | * After a new SQ head value was read by the application this | |
159 | * counter includes all submissions that were dropped reaching | |
160 | * the new SQ head (and possibly more). | |
161 | */ | |
75b28aff | 162 | u32 sq_dropped; |
1e84b97b | 163 | /* |
0d9b5b3a | 164 | * Runtime SQ flags |
1e84b97b SB |
165 | * |
166 | * Written by the kernel, shouldn't be modified by the | |
167 | * application. | |
168 | * | |
169 | * The application needs a full memory barrier before checking | |
170 | * for IORING_SQ_NEED_WAKEUP after updating the sq tail. | |
171 | */ | |
75b28aff | 172 | u32 sq_flags; |
0d9b5b3a SG |
173 | /* |
174 | * Runtime CQ flags | |
175 | * | |
176 | * Written by the application, shouldn't be modified by the | |
177 | * kernel. | |
178 | */ | |
fe7e3257 | 179 | u32 cq_flags; |
1e84b97b SB |
180 | /* |
181 | * Number of completion events lost because the queue was full; | |
182 | * this should be avoided by the application by making sure | |
0b4295b5 | 183 | * there are not more requests pending than there is space in |
1e84b97b SB |
184 | * the completion queue. |
185 | * | |
186 | * Written by the kernel, shouldn't be modified by the | |
187 | * application (i.e. get number of "new events" by comparing to | |
188 | * cached value). | |
189 | * | |
190 | * As completion events come in out of order this counter is not | |
191 | * ordered with any other data. | |
192 | */ | |
75b28aff | 193 | u32 cq_overflow; |
1e84b97b SB |
194 | /* |
195 | * Ring buffer of completion events. | |
196 | * | |
197 | * The kernel writes completion events fresh every time they are | |
198 | * produced, so the application is allowed to modify pending | |
199 | * entries. | |
200 | */ | |
75b28aff | 201 | struct io_uring_cqe cqes[] ____cacheline_aligned_in_smp; |
2b188cc1 JA |
202 | }; |
203 | ||
45d189c6 | 204 | enum io_uring_cmd_flags { |
51aac424 | 205 | IO_URING_F_COMPLETE_DEFER = 1, |
3b44b371 | 206 | IO_URING_F_UNLOCKED = 2, |
51aac424 PB |
207 | /* int's last bit, sign checks are usually faster than a bit test */ |
208 | IO_URING_F_NONBLOCK = INT_MIN, | |
45d189c6 PB |
209 | }; |
210 | ||
edafccee JA |
211 | struct io_mapped_ubuf { |
212 | u64 ubuf; | |
4751f53d | 213 | u64 ubuf_end; |
edafccee | 214 | unsigned int nr_bvecs; |
de293938 | 215 | unsigned long acct_pages; |
41edf1a5 | 216 | struct bio_vec bvec[]; |
edafccee JA |
217 | }; |
218 | ||
50238531 BM |
219 | struct io_ring_ctx; |
220 | ||
6c2450ae PB |
221 | struct io_overflow_cqe { |
222 | struct io_uring_cqe cqe; | |
223 | struct list_head list; | |
224 | }; | |
225 | ||
a04b0ac0 PB |
226 | struct io_fixed_file { |
227 | /* file * with additional FFS_* flags */ | |
228 | unsigned long file_ptr; | |
229 | }; | |
230 | ||
269bbe5f BM |
231 | struct io_rsrc_put { |
232 | struct list_head list; | |
b60c8dce | 233 | u64 tag; |
50238531 BM |
234 | union { |
235 | void *rsrc; | |
236 | struct file *file; | |
bd54b6fe | 237 | struct io_mapped_ubuf *buf; |
50238531 | 238 | }; |
269bbe5f BM |
239 | }; |
240 | ||
aeca241b | 241 | struct io_file_table { |
042b0d85 | 242 | struct io_fixed_file *files; |
31b51510 JA |
243 | }; |
244 | ||
b895c9a6 | 245 | struct io_rsrc_node { |
05589553 XW |
246 | struct percpu_ref refs; |
247 | struct list_head node; | |
269bbe5f | 248 | struct list_head rsrc_list; |
b895c9a6 | 249 | struct io_rsrc_data *rsrc_data; |
4a38aed2 | 250 | struct llist_node llist; |
e297822b | 251 | bool done; |
05589553 XW |
252 | }; |
253 | ||
40ae0ff7 PB |
254 | typedef void (rsrc_put_fn)(struct io_ring_ctx *ctx, struct io_rsrc_put *prsrc); |
255 | ||
b895c9a6 | 256 | struct io_rsrc_data { |
05f3fb3c JA |
257 | struct io_ring_ctx *ctx; |
258 | ||
2d091d62 PB |
259 | u64 **tags; |
260 | unsigned int nr; | |
40ae0ff7 | 261 | rsrc_put_fn *do_put; |
3e942498 | 262 | atomic_t refs; |
05f3fb3c | 263 | struct completion done; |
8bad28d8 | 264 | bool quiesce; |
05f3fb3c JA |
265 | }; |
266 | ||
dbc7d452 JA |
267 | struct io_buffer_list { |
268 | struct list_head list; | |
269 | struct list_head buf_list; | |
270 | __u16 bgid; | |
271 | }; | |
272 | ||
5a2e745d JA |
273 | struct io_buffer { |
274 | struct list_head list; | |
275 | __u64 addr; | |
d1f82808 | 276 | __u32 len; |
5a2e745d | 277 | __u16 bid; |
b1c62645 | 278 | __u16 bgid; |
5a2e745d JA |
279 | }; |
280 | ||
21b55dbc SG |
281 | struct io_restriction { |
282 | DECLARE_BITMAP(register_op, IORING_REGISTER_LAST); | |
283 | DECLARE_BITMAP(sqe_op, IORING_OP_LAST); | |
284 | u8 sqe_flags_allowed; | |
285 | u8 sqe_flags_required; | |
7e84e1c7 | 286 | bool registered; |
21b55dbc SG |
287 | }; |
288 | ||
37d1e2e3 JA |
289 | enum { |
290 | IO_SQ_THREAD_SHOULD_STOP = 0, | |
291 | IO_SQ_THREAD_SHOULD_PARK, | |
292 | }; | |
293 | ||
534ca6d6 JA |
294 | struct io_sq_data { |
295 | refcount_t refs; | |
9e138a48 | 296 | atomic_t park_pending; |
09a6f4ef | 297 | struct mutex lock; |
69fb2131 JA |
298 | |
299 | /* ctx's that are using this sqd */ | |
300 | struct list_head ctx_list; | |
69fb2131 | 301 | |
534ca6d6 JA |
302 | struct task_struct *thread; |
303 | struct wait_queue_head wait; | |
08369246 XW |
304 | |
305 | unsigned sq_thread_idle; | |
37d1e2e3 JA |
306 | int sq_cpu; |
307 | pid_t task_pid; | |
5c2469e0 | 308 | pid_t task_tgid; |
37d1e2e3 JA |
309 | |
310 | unsigned long state; | |
37d1e2e3 | 311 | struct completion exited; |
534ca6d6 JA |
312 | }; |
313 | ||
6dd0be1e | 314 | #define IO_COMPL_BATCH 32 |
6ff119a6 | 315 | #define IO_REQ_CACHE_SIZE 32 |
bf019da7 | 316 | #define IO_REQ_ALLOC_BATCH 8 |
258b29a9 | 317 | |
a1ab7b35 PB |
318 | struct io_submit_link { |
319 | struct io_kiocb *head; | |
320 | struct io_kiocb *last; | |
321 | }; | |
322 | ||
258b29a9 | 323 | struct io_submit_state { |
5a158c6b PB |
324 | /* inline/task_work completion list, under ->uring_lock */ |
325 | struct io_wq_work_node free_list; | |
326 | /* batch completion logic */ | |
327 | struct io_wq_work_list compl_reqs; | |
a1ab7b35 | 328 | struct io_submit_link link; |
258b29a9 | 329 | |
258b29a9 | 330 | bool plug_started; |
4b628aeb | 331 | bool need_plug; |
3d4aeb9f | 332 | bool flush_cqes; |
5ca7a8b3 | 333 | unsigned short submit_nr; |
5a158c6b | 334 | struct blk_plug plug; |
258b29a9 PB |
335 | }; |
336 | ||
77bc59b4 UA |
337 | struct io_ev_fd { |
338 | struct eventfd_ctx *cq_ev_fd; | |
c75312dd | 339 | unsigned int eventfd_async: 1; |
77bc59b4 UA |
340 | struct rcu_head rcu; |
341 | }; | |
342 | ||
dbc7d452 JA |
343 | #define IO_BUFFERS_HASH_BITS 5 |
344 | ||
2b188cc1 | 345 | struct io_ring_ctx { |
b52ecf8c | 346 | /* const or read-mostly hot data */ |
2b188cc1 JA |
347 | struct { |
348 | struct percpu_ref refs; | |
2b188cc1 | 349 | |
b52ecf8c | 350 | struct io_rings *rings; |
2b188cc1 | 351 | unsigned int flags; |
e1d85334 | 352 | unsigned int compat: 1; |
e1d85334 | 353 | unsigned int drain_next: 1; |
21b55dbc | 354 | unsigned int restricted: 1; |
f18ee4cf | 355 | unsigned int off_timeout_used: 1; |
10c66904 | 356 | unsigned int drain_active: 1; |
5562a8d7 | 357 | unsigned int drain_disabled: 1; |
9aa8dfde | 358 | unsigned int has_evfd: 1; |
773697b6 | 359 | unsigned int syscall_iopoll: 1; |
b52ecf8c | 360 | } ____cacheline_aligned_in_smp; |
2b188cc1 | 361 | |
7f1129d2 | 362 | /* submission data */ |
b52ecf8c | 363 | struct { |
0499e582 PB |
364 | struct mutex uring_lock; |
365 | ||
75b28aff HV |
366 | /* |
367 | * Ring buffer of indices into array of io_uring_sqe, which is | |
368 | * mmapped by the application using the IORING_OFF_SQES offset. | |
369 | * | |
370 | * This indirection could e.g. be used to assign fixed | |
371 | * io_uring_sqe entries to operations and only submit them to | |
372 | * the queue when needed. | |
373 | * | |
374 | * The kernel modifies neither the indices array nor the entries | |
375 | * array. | |
376 | */ | |
377 | u32 *sq_array; | |
c7af47cf | 378 | struct io_uring_sqe *sq_sqes; |
2b188cc1 JA |
379 | unsigned cached_sq_head; |
380 | unsigned sq_entries; | |
de0617e4 | 381 | struct list_head defer_list; |
7f1129d2 PB |
382 | |
383 | /* | |
384 | * Fixed resources fast path, should be accessed only under | |
385 | * uring_lock, and updated through io_uring_register(2) | |
386 | */ | |
387 | struct io_rsrc_node *rsrc_node; | |
ab409402 | 388 | int rsrc_cached_refs; |
7f1129d2 PB |
389 | struct io_file_table file_table; |
390 | unsigned nr_user_files; | |
391 | unsigned nr_user_bufs; | |
392 | struct io_mapped_ubuf **user_bufs; | |
393 | ||
394 | struct io_submit_state submit_state; | |
5262f567 | 395 | struct list_head timeout_list; |
ef9dd637 | 396 | struct list_head ltimeout_list; |
1d7bb1d5 | 397 | struct list_head cq_overflow_list; |
dbc7d452 | 398 | struct list_head *io_buffers; |
cc3cec83 | 399 | struct list_head io_buffers_cache; |
4d9237e3 | 400 | struct list_head apoll_cache; |
7f1129d2 PB |
401 | struct xarray personalities; |
402 | u32 pers_next; | |
403 | unsigned sq_thread_idle; | |
2b188cc1 JA |
404 | } ____cacheline_aligned_in_smp; |
405 | ||
d0acdee2 | 406 | /* IRQ completion list, under ->completion_lock */ |
c2b6c6bc | 407 | struct io_wq_work_list locked_free_list; |
d0acdee2 | 408 | unsigned int locked_free_nr; |
3c1a2ead | 409 | |
7c30f36a | 410 | const struct cred *sq_creds; /* cred used for __io_sq_thread() */ |
534ca6d6 JA |
411 | struct io_sq_data *sq_data; /* if using sq thread polling */ |
412 | ||
90554200 | 413 | struct wait_queue_head sqo_sq_wait; |
69fb2131 | 414 | struct list_head sqd_list; |
75b28aff | 415 | |
5ed7a37d PB |
416 | unsigned long check_cq_overflow; |
417 | ||
206aefde JA |
418 | struct { |
419 | unsigned cached_cq_tail; | |
420 | unsigned cq_entries; | |
77bc59b4 | 421 | struct io_ev_fd __rcu *io_ev_fd; |
0499e582 PB |
422 | struct wait_queue_head cq_wait; |
423 | unsigned cq_extra; | |
424 | atomic_t cq_timeouts; | |
0499e582 | 425 | unsigned cq_last_tm_flush; |
206aefde | 426 | } ____cacheline_aligned_in_smp; |
2b188cc1 | 427 | |
2b188cc1 JA |
428 | struct { |
429 | spinlock_t completion_lock; | |
e94f141b | 430 | |
89850fce JA |
431 | spinlock_t timeout_lock; |
432 | ||
def596e9 | 433 | /* |
540e32a0 | 434 | * ->iopoll_list is protected by the ctx->uring_lock for |
def596e9 JA |
435 | * io_uring instances that don't use IORING_SETUP_SQPOLL. |
436 | * For SQPOLL, only the single threaded io_sq_thread() will | |
437 | * manipulate the list, hence no extra locking is needed there. | |
438 | */ | |
5eef4e87 | 439 | struct io_wq_work_list iopoll_list; |
78076bb6 JA |
440 | struct hlist_head *cancel_hash; |
441 | unsigned cancel_hash_bits; | |
915b3dde | 442 | bool poll_multi_queue; |
cc3cec83 JA |
443 | |
444 | struct list_head io_buffers_comp; | |
2b188cc1 | 445 | } ____cacheline_aligned_in_smp; |
85faa7b8 | 446 | |
21b55dbc | 447 | struct io_restriction restrictions; |
3c1a2ead | 448 | |
b13a8918 PB |
449 | /* slow path rsrc auxilary data, used by update/register */ |
450 | struct { | |
451 | struct io_rsrc_node *rsrc_backup_node; | |
452 | struct io_mapped_ubuf *dummy_ubuf; | |
453 | struct io_rsrc_data *file_data; | |
454 | struct io_rsrc_data *buf_data; | |
455 | ||
456 | struct delayed_work rsrc_put_work; | |
457 | struct llist_head rsrc_put_llist; | |
458 | struct list_head rsrc_ref_list; | |
459 | spinlock_t rsrc_ref_lock; | |
cc3cec83 JA |
460 | |
461 | struct list_head io_buffers_pages; | |
b13a8918 PB |
462 | }; |
463 | ||
3c1a2ead | 464 | /* Keep this last, we don't need it for the fast path */ |
b986af7e PB |
465 | struct { |
466 | #if defined(CONFIG_UNIX) | |
467 | struct socket *ring_sock; | |
468 | #endif | |
469 | /* hashed buffered write serialization */ | |
470 | struct io_wq_hash *hash_map; | |
471 | ||
472 | /* Only used for accounting purposes */ | |
473 | struct user_struct *user; | |
474 | struct mm_struct *mm_account; | |
475 | ||
476 | /* ctx exit and cancelation */ | |
9011bf9a PB |
477 | struct llist_head fallback_llist; |
478 | struct delayed_work fallback_work; | |
b986af7e PB |
479 | struct work_struct exit_work; |
480 | struct list_head tctx_list; | |
481 | struct completion ref_comp; | |
e139a1ec PB |
482 | u32 iowq_limits[2]; |
483 | bool iowq_limits_set; | |
b986af7e | 484 | }; |
2b188cc1 JA |
485 | }; |
486 | ||
e7a6c00d JA |
487 | /* |
488 | * Arbitrary limit, can be raised if need be | |
489 | */ | |
490 | #define IO_RINGFD_REG_MAX 16 | |
491 | ||
53e043b2 SM |
492 | struct io_uring_task { |
493 | /* submission side */ | |
09899b19 | 494 | int cached_refs; |
53e043b2 SM |
495 | struct xarray xa; |
496 | struct wait_queue_head wait; | |
ee53fb2b SM |
497 | const struct io_ring_ctx *last; |
498 | struct io_wq *io_wq; | |
53e043b2 SM |
499 | struct percpu_counter inflight; |
500 | atomic_t in_idle; | |
53e043b2 SM |
501 | |
502 | spinlock_t task_lock; | |
503 | struct io_wq_work_list task_list; | |
4813c377 | 504 | struct io_wq_work_list prior_task_list; |
53e043b2 | 505 | struct callback_head task_work; |
e7a6c00d | 506 | struct file **registered_rings; |
6294f368 | 507 | bool task_running; |
53e043b2 SM |
508 | }; |
509 | ||
09bb8394 JA |
510 | /* |
511 | * First field must be the file pointer in all the | |
512 | * iocb unions! See also 'struct kiocb' in <linux/fs.h> | |
513 | */ | |
221c5eb2 JA |
514 | struct io_poll_iocb { |
515 | struct file *file; | |
018043be | 516 | struct wait_queue_head *head; |
221c5eb2 | 517 | __poll_t events; |
392edb45 | 518 | struct wait_queue_entry wait; |
221c5eb2 JA |
519 | }; |
520 | ||
9d805892 | 521 | struct io_poll_update { |
018043be | 522 | struct file *file; |
9d805892 PB |
523 | u64 old_user_data; |
524 | u64 new_user_data; | |
525 | __poll_t events; | |
b69de288 JA |
526 | bool update_events; |
527 | bool update_user_data; | |
018043be PB |
528 | }; |
529 | ||
b5dba59e JA |
530 | struct io_close { |
531 | struct file *file; | |
b5dba59e | 532 | int fd; |
7df778be | 533 | u32 file_slot; |
b5dba59e JA |
534 | }; |
535 | ||
ad8a48ac JA |
536 | struct io_timeout_data { |
537 | struct io_kiocb *req; | |
538 | struct hrtimer timer; | |
539 | struct timespec64 ts; | |
540 | enum hrtimer_mode mode; | |
50c1df2b | 541 | u32 flags; |
ad8a48ac JA |
542 | }; |
543 | ||
8ed8d3c3 JA |
544 | struct io_accept { |
545 | struct file *file; | |
546 | struct sockaddr __user *addr; | |
547 | int __user *addr_len; | |
548 | int flags; | |
aaa4db12 | 549 | u32 file_slot; |
09952e3e | 550 | unsigned long nofile; |
8ed8d3c3 JA |
551 | }; |
552 | ||
553 | struct io_sync { | |
554 | struct file *file; | |
555 | loff_t len; | |
556 | loff_t off; | |
557 | int flags; | |
d63d1b5e | 558 | int mode; |
8ed8d3c3 JA |
559 | }; |
560 | ||
fbf23849 JA |
561 | struct io_cancel { |
562 | struct file *file; | |
563 | u64 addr; | |
564 | }; | |
565 | ||
b29472ee JA |
566 | struct io_timeout { |
567 | struct file *file; | |
bfe68a22 PB |
568 | u32 off; |
569 | u32 target_seq; | |
135fcde8 | 570 | struct list_head list; |
90cd7e42 PB |
571 | /* head of the link, used by linked timeouts only */ |
572 | struct io_kiocb *head; | |
89b263f6 JA |
573 | /* for linked completions */ |
574 | struct io_kiocb *prev; | |
b29472ee JA |
575 | }; |
576 | ||
0bdf7a2d PB |
577 | struct io_timeout_rem { |
578 | struct file *file; | |
579 | u64 addr; | |
9c8e11b3 PB |
580 | |
581 | /* timeout update */ | |
582 | struct timespec64 ts; | |
583 | u32 flags; | |
f1042b6c | 584 | bool ltimeout; |
0bdf7a2d PB |
585 | }; |
586 | ||
9adbd45d JA |
587 | struct io_rw { |
588 | /* NOTE: kiocb has the file as the first member, so don't do it here */ | |
589 | struct kiocb kiocb; | |
590 | u64 addr; | |
584b0180 JA |
591 | u32 len; |
592 | u32 flags; | |
9adbd45d JA |
593 | }; |
594 | ||
3fbb51c1 JA |
595 | struct io_connect { |
596 | struct file *file; | |
597 | struct sockaddr __user *addr; | |
598 | int addr_len; | |
599 | }; | |
600 | ||
e47293fd JA |
601 | struct io_sr_msg { |
602 | struct file *file; | |
fddaface | 603 | union { |
4af3417a PB |
604 | struct compat_msghdr __user *umsg_compat; |
605 | struct user_msghdr __user *umsg; | |
606 | void __user *buf; | |
fddaface | 607 | }; |
e47293fd | 608 | int msg_flags; |
bcda7baa | 609 | int bgid; |
fddaface | 610 | size_t len; |
7ba89d2a | 611 | size_t done_io; |
e47293fd JA |
612 | }; |
613 | ||
15b71abe JA |
614 | struct io_open { |
615 | struct file *file; | |
616 | int dfd; | |
b9445598 | 617 | u32 file_slot; |
15b71abe | 618 | struct filename *filename; |
c12cedf2 | 619 | struct open_how how; |
4022e7af | 620 | unsigned long nofile; |
15b71abe JA |
621 | }; |
622 | ||
269bbe5f | 623 | struct io_rsrc_update { |
05f3fb3c JA |
624 | struct file *file; |
625 | u64 arg; | |
626 | u32 nr_args; | |
627 | u32 offset; | |
628 | }; | |
629 | ||
4840e418 JA |
630 | struct io_fadvise { |
631 | struct file *file; | |
632 | u64 offset; | |
633 | u32 len; | |
634 | u32 advice; | |
635 | }; | |
636 | ||
c1ca757b JA |
637 | struct io_madvise { |
638 | struct file *file; | |
639 | u64 addr; | |
640 | u32 len; | |
641 | u32 advice; | |
642 | }; | |
643 | ||
3e4827b0 JA |
644 | struct io_epoll { |
645 | struct file *file; | |
646 | int epfd; | |
647 | int op; | |
648 | int fd; | |
649 | struct epoll_event event; | |
e47293fd JA |
650 | }; |
651 | ||
7d67af2c PB |
652 | struct io_splice { |
653 | struct file *file_out; | |
7d67af2c PB |
654 | loff_t off_out; |
655 | loff_t off_in; | |
656 | u64 len; | |
a3e4bc23 | 657 | int splice_fd_in; |
7d67af2c PB |
658 | unsigned int flags; |
659 | }; | |
660 | ||
ddf0322d JA |
661 | struct io_provide_buf { |
662 | struct file *file; | |
663 | __u64 addr; | |
38134ada | 664 | __u32 len; |
ddf0322d JA |
665 | __u32 bgid; |
666 | __u16 nbufs; | |
667 | __u16 bid; | |
668 | }; | |
669 | ||
1d9e1288 BM |
670 | struct io_statx { |
671 | struct file *file; | |
672 | int dfd; | |
673 | unsigned int mask; | |
674 | unsigned int flags; | |
1b6fe6e0 | 675 | struct filename *filename; |
1d9e1288 BM |
676 | struct statx __user *buffer; |
677 | }; | |
678 | ||
36f4fa68 JA |
679 | struct io_shutdown { |
680 | struct file *file; | |
681 | int how; | |
682 | }; | |
683 | ||
80a261fd JA |
684 | struct io_rename { |
685 | struct file *file; | |
686 | int old_dfd; | |
687 | int new_dfd; | |
688 | struct filename *oldpath; | |
689 | struct filename *newpath; | |
690 | int flags; | |
691 | }; | |
692 | ||
14a1143b JA |
693 | struct io_unlink { |
694 | struct file *file; | |
695 | int dfd; | |
696 | int flags; | |
697 | struct filename *filename; | |
698 | }; | |
699 | ||
e34a02dc DK |
700 | struct io_mkdir { |
701 | struct file *file; | |
702 | int dfd; | |
703 | umode_t mode; | |
704 | struct filename *filename; | |
705 | }; | |
706 | ||
7a8721f8 DK |
707 | struct io_symlink { |
708 | struct file *file; | |
709 | int new_dfd; | |
710 | struct filename *oldpath; | |
711 | struct filename *newpath; | |
712 | }; | |
713 | ||
cf30da90 DK |
714 | struct io_hardlink { |
715 | struct file *file; | |
716 | int old_dfd; | |
717 | int new_dfd; | |
718 | struct filename *oldpath; | |
719 | struct filename *newpath; | |
720 | int flags; | |
721 | }; | |
722 | ||
4f57f06c JA |
723 | struct io_msg { |
724 | struct file *file; | |
725 | u64 user_data; | |
726 | u32 len; | |
727 | }; | |
728 | ||
f499a021 JA |
729 | struct io_async_connect { |
730 | struct sockaddr_storage address; | |
731 | }; | |
732 | ||
03b1230c JA |
733 | struct io_async_msghdr { |
734 | struct iovec fast_iov[UIO_FASTIOV]; | |
257e84a5 PB |
735 | /* points to an allocated iov, if NULL we use fast_iov instead */ |
736 | struct iovec *free_iov; | |
03b1230c JA |
737 | struct sockaddr __user *uaddr; |
738 | struct msghdr msg; | |
b537916c | 739 | struct sockaddr_storage addr; |
03b1230c JA |
740 | }; |
741 | ||
538941e2 | 742 | struct io_rw_state { |
ff6165b2 | 743 | struct iov_iter iter; |
cd658695 | 744 | struct iov_iter_state iter_state; |
c88598a9 | 745 | struct iovec fast_iov[UIO_FASTIOV]; |
538941e2 PB |
746 | }; |
747 | ||
748 | struct io_async_rw { | |
749 | struct io_rw_state s; | |
750 | const struct iovec *free_iovec; | |
227c0c96 | 751 | size_t bytes_done; |
bcf5a063 | 752 | struct wait_page_queue wpq; |
f67676d1 JA |
753 | }; |
754 | ||
6b47ee6e PB |
755 | enum { |
756 | REQ_F_FIXED_FILE_BIT = IOSQE_FIXED_FILE_BIT, | |
757 | REQ_F_IO_DRAIN_BIT = IOSQE_IO_DRAIN_BIT, | |
758 | REQ_F_LINK_BIT = IOSQE_IO_LINK_BIT, | |
759 | REQ_F_HARDLINK_BIT = IOSQE_IO_HARDLINK_BIT, | |
760 | REQ_F_FORCE_ASYNC_BIT = IOSQE_ASYNC_BIT, | |
bcda7baa | 761 | REQ_F_BUFFER_SELECT_BIT = IOSQE_BUFFER_SELECT_BIT, |
04c76b41 | 762 | REQ_F_CQE_SKIP_BIT = IOSQE_CQE_SKIP_SUCCESS_BIT, |
6b47ee6e | 763 | |
dddca226 | 764 | /* first byte is taken by user flags, shift it to not overlap */ |
93d2bcd2 | 765 | REQ_F_FAIL_BIT = 8, |
6b47ee6e PB |
766 | REQ_F_INFLIGHT_BIT, |
767 | REQ_F_CUR_POS_BIT, | |
768 | REQ_F_NOWAIT_BIT, | |
6b47ee6e | 769 | REQ_F_LINK_TIMEOUT_BIT, |
99bc4c38 | 770 | REQ_F_NEED_CLEANUP_BIT, |
d7718a9d | 771 | REQ_F_POLLED_BIT, |
bcda7baa | 772 | REQ_F_BUFFER_SELECTED_BIT, |
e342c807 | 773 | REQ_F_COMPLETE_INLINE_BIT, |
230d50d4 | 774 | REQ_F_REISSUE_BIT, |
b8e64b53 | 775 | REQ_F_CREDS_BIT, |
20e60a38 | 776 | REQ_F_REFCOUNT_BIT, |
4d13d1a4 | 777 | REQ_F_ARM_LTIMEOUT_BIT, |
d886e185 | 778 | REQ_F_ASYNC_DATA_BIT, |
04c76b41 | 779 | REQ_F_SKIP_LINK_CQES_BIT, |
91eac1c6 JA |
780 | REQ_F_SINGLE_POLL_BIT, |
781 | REQ_F_DOUBLE_POLL_BIT, | |
8a3e8ee5 | 782 | REQ_F_PARTIAL_IO_BIT, |
7b29f92d | 783 | /* keep async read/write and isreg together and in order */ |
35645ac3 | 784 | REQ_F_SUPPORT_NOWAIT_BIT, |
7b29f92d | 785 | REQ_F_ISREG_BIT, |
84557871 JA |
786 | |
787 | /* not a real bit, just to check we're not overflowing the space */ | |
788 | __REQ_F_LAST_BIT, | |
6b47ee6e PB |
789 | }; |
790 | ||
791 | enum { | |
792 | /* ctx owns file */ | |
793 | REQ_F_FIXED_FILE = BIT(REQ_F_FIXED_FILE_BIT), | |
794 | /* drain existing IO first */ | |
795 | REQ_F_IO_DRAIN = BIT(REQ_F_IO_DRAIN_BIT), | |
796 | /* linked sqes */ | |
797 | REQ_F_LINK = BIT(REQ_F_LINK_BIT), | |
798 | /* doesn't sever on completion < 0 */ | |
799 | REQ_F_HARDLINK = BIT(REQ_F_HARDLINK_BIT), | |
800 | /* IOSQE_ASYNC */ | |
801 | REQ_F_FORCE_ASYNC = BIT(REQ_F_FORCE_ASYNC_BIT), | |
bcda7baa JA |
802 | /* IOSQE_BUFFER_SELECT */ |
803 | REQ_F_BUFFER_SELECT = BIT(REQ_F_BUFFER_SELECT_BIT), | |
04c76b41 PB |
804 | /* IOSQE_CQE_SKIP_SUCCESS */ |
805 | REQ_F_CQE_SKIP = BIT(REQ_F_CQE_SKIP_BIT), | |
6b47ee6e | 806 | |
6b47ee6e | 807 | /* fail rest of links */ |
93d2bcd2 | 808 | REQ_F_FAIL = BIT(REQ_F_FAIL_BIT), |
b05a1bcd | 809 | /* on inflight list, should be cancelled and waited on exit reliably */ |
6b47ee6e PB |
810 | REQ_F_INFLIGHT = BIT(REQ_F_INFLIGHT_BIT), |
811 | /* read/write uses file position */ | |
812 | REQ_F_CUR_POS = BIT(REQ_F_CUR_POS_BIT), | |
813 | /* must not punt to workers */ | |
814 | REQ_F_NOWAIT = BIT(REQ_F_NOWAIT_BIT), | |
900fad45 | 815 | /* has or had linked timeout */ |
6b47ee6e | 816 | REQ_F_LINK_TIMEOUT = BIT(REQ_F_LINK_TIMEOUT_BIT), |
99bc4c38 PB |
817 | /* needs cleanup */ |
818 | REQ_F_NEED_CLEANUP = BIT(REQ_F_NEED_CLEANUP_BIT), | |
d7718a9d JA |
819 | /* already went through poll handler */ |
820 | REQ_F_POLLED = BIT(REQ_F_POLLED_BIT), | |
bcda7baa JA |
821 | /* buffer already selected */ |
822 | REQ_F_BUFFER_SELECTED = BIT(REQ_F_BUFFER_SELECTED_BIT), | |
e342c807 PB |
823 | /* completion is deferred through io_comp_state */ |
824 | REQ_F_COMPLETE_INLINE = BIT(REQ_F_COMPLETE_INLINE_BIT), | |
230d50d4 JA |
825 | /* caller should reissue async */ |
826 | REQ_F_REISSUE = BIT(REQ_F_REISSUE_BIT), | |
35645ac3 PB |
827 | /* supports async reads/writes */ |
828 | REQ_F_SUPPORT_NOWAIT = BIT(REQ_F_SUPPORT_NOWAIT_BIT), | |
7b29f92d JA |
829 | /* regular file */ |
830 | REQ_F_ISREG = BIT(REQ_F_ISREG_BIT), | |
b8e64b53 PB |
831 | /* has creds assigned */ |
832 | REQ_F_CREDS = BIT(REQ_F_CREDS_BIT), | |
20e60a38 PB |
833 | /* skip refcounting if not set */ |
834 | REQ_F_REFCOUNT = BIT(REQ_F_REFCOUNT_BIT), | |
4d13d1a4 PB |
835 | /* there is a linked timeout that has to be armed */ |
836 | REQ_F_ARM_LTIMEOUT = BIT(REQ_F_ARM_LTIMEOUT_BIT), | |
d886e185 PB |
837 | /* ->async_data allocated */ |
838 | REQ_F_ASYNC_DATA = BIT(REQ_F_ASYNC_DATA_BIT), | |
04c76b41 PB |
839 | /* don't post CQEs while failing linked requests */ |
840 | REQ_F_SKIP_LINK_CQES = BIT(REQ_F_SKIP_LINK_CQES_BIT), | |
91eac1c6 JA |
841 | /* single poll may be active */ |
842 | REQ_F_SINGLE_POLL = BIT(REQ_F_SINGLE_POLL_BIT), | |
843 | /* double poll may active */ | |
844 | REQ_F_DOUBLE_POLL = BIT(REQ_F_DOUBLE_POLL_BIT), | |
8a3e8ee5 JA |
845 | /* request has already done partial IO */ |
846 | REQ_F_PARTIAL_IO = BIT(REQ_F_PARTIAL_IO_BIT), | |
d7718a9d JA |
847 | }; |
848 | ||
849 | struct async_poll { | |
850 | struct io_poll_iocb poll; | |
807abcb0 | 851 | struct io_poll_iocb *double_poll; |
6b47ee6e PB |
852 | }; |
853 | ||
f237c30a | 854 | typedef void (*io_req_tw_func_t)(struct io_kiocb *req, bool *locked); |
5b0a6acc | 855 | |
7cbf1722 | 856 | struct io_task_work { |
5b0a6acc PB |
857 | union { |
858 | struct io_wq_work_node node; | |
859 | struct llist_node fallback_node; | |
860 | }; | |
861 | io_req_tw_func_t func; | |
7cbf1722 JA |
862 | }; |
863 | ||
992da01a PB |
864 | enum { |
865 | IORING_RSRC_FILE = 0, | |
866 | IORING_RSRC_BUFFER = 1, | |
867 | }; | |
868 | ||
cef216fc PB |
869 | struct io_cqe { |
870 | __u64 user_data; | |
871 | __s32 res; | |
872 | /* fd initially, then cflags for completion */ | |
873 | union { | |
874 | __u32 flags; | |
875 | int fd; | |
876 | }; | |
877 | }; | |
878 | ||
09bb8394 JA |
879 | /* |
880 | * NOTE! Each of the iocb union members has the file pointer | |
881 | * as the first entry in their struct definition. So you can | |
882 | * access the file pointer through any of the sub-structs, | |
63c36549 | 883 | * or directly as just 'file' in this struct. |
09bb8394 | 884 | */ |
2b188cc1 | 885 | struct io_kiocb { |
221c5eb2 | 886 | union { |
09bb8394 | 887 | struct file *file; |
9adbd45d | 888 | struct io_rw rw; |
221c5eb2 | 889 | struct io_poll_iocb poll; |
9d805892 | 890 | struct io_poll_update poll_update; |
8ed8d3c3 JA |
891 | struct io_accept accept; |
892 | struct io_sync sync; | |
fbf23849 | 893 | struct io_cancel cancel; |
b29472ee | 894 | struct io_timeout timeout; |
0bdf7a2d | 895 | struct io_timeout_rem timeout_rem; |
3fbb51c1 | 896 | struct io_connect connect; |
e47293fd | 897 | struct io_sr_msg sr_msg; |
15b71abe | 898 | struct io_open open; |
b5dba59e | 899 | struct io_close close; |
269bbe5f | 900 | struct io_rsrc_update rsrc_update; |
4840e418 | 901 | struct io_fadvise fadvise; |
c1ca757b | 902 | struct io_madvise madvise; |
3e4827b0 | 903 | struct io_epoll epoll; |
7d67af2c | 904 | struct io_splice splice; |
ddf0322d | 905 | struct io_provide_buf pbuf; |
1d9e1288 | 906 | struct io_statx statx; |
36f4fa68 | 907 | struct io_shutdown shutdown; |
80a261fd | 908 | struct io_rename rename; |
14a1143b | 909 | struct io_unlink unlink; |
e34a02dc | 910 | struct io_mkdir mkdir; |
7a8721f8 | 911 | struct io_symlink symlink; |
cf30da90 | 912 | struct io_hardlink hardlink; |
4f57f06c | 913 | struct io_msg msg; |
221c5eb2 | 914 | }; |
2b188cc1 | 915 | |
d625c6ee | 916 | u8 opcode; |
65a6543d XW |
917 | /* polled IO has completed */ |
918 | u8 iopoll_completed; | |
4f4eeba8 | 919 | u16 buf_index; |
d17e56eb PB |
920 | unsigned int flags; |
921 | ||
cef216fc | 922 | struct io_cqe cqe; |
4f4eeba8 | 923 | |
010e8e6b | 924 | struct io_ring_ctx *ctx; |
010e8e6b | 925 | struct task_struct *task; |
d7718a9d | 926 | |
269bbe5f | 927 | struct percpu_ref *fixed_rsrc_refs; |
d886e185 PB |
928 | /* store used ubuf, so we can prevent reloading */ |
929 | struct io_mapped_ubuf *imu; | |
fcb323cc | 930 | |
2804ecd8 JA |
931 | union { |
932 | /* used by request caches, completion batching and iopoll */ | |
933 | struct io_wq_work_node comp_list; | |
934 | /* cache ->apoll->events */ | |
935 | int apoll_events; | |
936 | }; | |
d17e56eb | 937 | atomic_t refs; |
521d61fc | 938 | atomic_t poll_refs; |
5b0a6acc | 939 | struct io_task_work io_task_work; |
010e8e6b PB |
940 | /* for polled requests, i.e. IORING_OP_POLL_ADD and async armed poll */ |
941 | struct hlist_node hash_node; | |
7e3709d5 | 942 | /* internal polling, see IORING_FEAT_FAST_POLL */ |
010e8e6b | 943 | struct async_poll *apoll; |
d886e185 PB |
944 | /* opcode allocated if it needs to store data for async defer */ |
945 | void *async_data; | |
7e3709d5 | 946 | /* stores selected buf, valid IFF REQ_F_BUFFER_SELECTED is set */ |
30d51dd4 | 947 | struct io_buffer *kbuf; |
41cdcc22 | 948 | /* linked requests, IFF REQ_F_HARDLINK or REQ_F_LINK are set */ |
34d2bfe7 | 949 | struct io_kiocb *link; |
41cdcc22 | 950 | /* custom credentials, valid IFF REQ_F_CREDS is set */ |
521d61fc JA |
951 | const struct cred *creds; |
952 | struct io_wq_work work; | |
2b188cc1 | 953 | }; |
05589553 | 954 | |
13bf43f5 PB |
955 | struct io_tctx_node { |
956 | struct list_head ctx_node; | |
957 | struct task_struct *task; | |
13bf43f5 PB |
958 | struct io_ring_ctx *ctx; |
959 | }; | |
960 | ||
27dc8338 PB |
961 | struct io_defer_entry { |
962 | struct list_head list; | |
963 | struct io_kiocb *req; | |
9cf7c104 | 964 | u32 seq; |
2b188cc1 JA |
965 | }; |
966 | ||
d3656344 | 967 | struct io_op_def { |
d3656344 JA |
968 | /* needs req->file assigned */ |
969 | unsigned needs_file : 1; | |
6d63416d PB |
970 | /* should block plug */ |
971 | unsigned plug : 1; | |
d3656344 JA |
972 | /* hash wq insertion if file is a regular file */ |
973 | unsigned hash_reg_file : 1; | |
974 | /* unbound wq insertion if file is a non-regular file */ | |
975 | unsigned unbound_nonreg_file : 1; | |
8a72758c JA |
976 | /* set if opcode supports polled "wait" */ |
977 | unsigned pollin : 1; | |
978 | unsigned pollout : 1; | |
52dd8640 | 979 | unsigned poll_exclusive : 1; |
bcda7baa JA |
980 | /* op supports buffer selection */ |
981 | unsigned buffer_select : 1; | |
26f0505a PB |
982 | /* do prep async if is going to be punted */ |
983 | unsigned needs_async_setup : 1; | |
6d63416d PB |
984 | /* opcode is not supported by this kernel */ |
985 | unsigned not_supported : 1; | |
5bd2182d PM |
986 | /* skip auditing */ |
987 | unsigned audit_skip : 1; | |
e8c2bc1f JA |
988 | /* size of async data needed, if any */ |
989 | unsigned short async_size; | |
d3656344 JA |
990 | }; |
991 | ||
0918682b | 992 | static const struct io_op_def io_op_defs[] = { |
0463b6c5 PB |
993 | [IORING_OP_NOP] = {}, |
994 | [IORING_OP_READV] = { | |
d3656344 JA |
995 | .needs_file = 1, |
996 | .unbound_nonreg_file = 1, | |
8a72758c | 997 | .pollin = 1, |
4d954c25 | 998 | .buffer_select = 1, |
26f0505a | 999 | .needs_async_setup = 1, |
27926b68 | 1000 | .plug = 1, |
5bd2182d | 1001 | .audit_skip = 1, |
e8c2bc1f | 1002 | .async_size = sizeof(struct io_async_rw), |
d3656344 | 1003 | }, |
0463b6c5 | 1004 | [IORING_OP_WRITEV] = { |
d3656344 JA |
1005 | .needs_file = 1, |
1006 | .hash_reg_file = 1, | |
1007 | .unbound_nonreg_file = 1, | |
8a72758c | 1008 | .pollout = 1, |
26f0505a | 1009 | .needs_async_setup = 1, |
27926b68 | 1010 | .plug = 1, |
5bd2182d | 1011 | .audit_skip = 1, |
e8c2bc1f | 1012 | .async_size = sizeof(struct io_async_rw), |
d3656344 | 1013 | }, |
0463b6c5 | 1014 | [IORING_OP_FSYNC] = { |
d3656344 | 1015 | .needs_file = 1, |
5bd2182d | 1016 | .audit_skip = 1, |
d3656344 | 1017 | }, |
0463b6c5 | 1018 | [IORING_OP_READ_FIXED] = { |
d3656344 JA |
1019 | .needs_file = 1, |
1020 | .unbound_nonreg_file = 1, | |
8a72758c | 1021 | .pollin = 1, |
27926b68 | 1022 | .plug = 1, |
5bd2182d | 1023 | .audit_skip = 1, |
e8c2bc1f | 1024 | .async_size = sizeof(struct io_async_rw), |
d3656344 | 1025 | }, |
0463b6c5 | 1026 | [IORING_OP_WRITE_FIXED] = { |
d3656344 JA |
1027 | .needs_file = 1, |
1028 | .hash_reg_file = 1, | |
1029 | .unbound_nonreg_file = 1, | |
8a72758c | 1030 | .pollout = 1, |
27926b68 | 1031 | .plug = 1, |
5bd2182d | 1032 | .audit_skip = 1, |
e8c2bc1f | 1033 | .async_size = sizeof(struct io_async_rw), |
d3656344 | 1034 | }, |
0463b6c5 | 1035 | [IORING_OP_POLL_ADD] = { |
d3656344 JA |
1036 | .needs_file = 1, |
1037 | .unbound_nonreg_file = 1, | |
5bd2182d PM |
1038 | .audit_skip = 1, |
1039 | }, | |
1040 | [IORING_OP_POLL_REMOVE] = { | |
1041 | .audit_skip = 1, | |
d3656344 | 1042 | }, |
0463b6c5 | 1043 | [IORING_OP_SYNC_FILE_RANGE] = { |
d3656344 | 1044 | .needs_file = 1, |
5bd2182d | 1045 | .audit_skip = 1, |
d3656344 | 1046 | }, |
0463b6c5 | 1047 | [IORING_OP_SENDMSG] = { |
d3656344 JA |
1048 | .needs_file = 1, |
1049 | .unbound_nonreg_file = 1, | |
8a72758c | 1050 | .pollout = 1, |
26f0505a | 1051 | .needs_async_setup = 1, |
e8c2bc1f | 1052 | .async_size = sizeof(struct io_async_msghdr), |
d3656344 | 1053 | }, |
0463b6c5 | 1054 | [IORING_OP_RECVMSG] = { |
d3656344 JA |
1055 | .needs_file = 1, |
1056 | .unbound_nonreg_file = 1, | |
8a72758c | 1057 | .pollin = 1, |
52de1fe1 | 1058 | .buffer_select = 1, |
26f0505a | 1059 | .needs_async_setup = 1, |
e8c2bc1f | 1060 | .async_size = sizeof(struct io_async_msghdr), |
d3656344 | 1061 | }, |
0463b6c5 | 1062 | [IORING_OP_TIMEOUT] = { |
5bd2182d | 1063 | .audit_skip = 1, |
e8c2bc1f | 1064 | .async_size = sizeof(struct io_timeout_data), |
d3656344 | 1065 | }, |
9c8e11b3 PB |
1066 | [IORING_OP_TIMEOUT_REMOVE] = { |
1067 | /* used by timeout updates' prep() */ | |
5bd2182d | 1068 | .audit_skip = 1, |
9c8e11b3 | 1069 | }, |
0463b6c5 | 1070 | [IORING_OP_ACCEPT] = { |
d3656344 JA |
1071 | .needs_file = 1, |
1072 | .unbound_nonreg_file = 1, | |
8a72758c | 1073 | .pollin = 1, |
52dd8640 | 1074 | .poll_exclusive = 1, |
d3656344 | 1075 | }, |
5bd2182d PM |
1076 | [IORING_OP_ASYNC_CANCEL] = { |
1077 | .audit_skip = 1, | |
1078 | }, | |
0463b6c5 | 1079 | [IORING_OP_LINK_TIMEOUT] = { |
5bd2182d | 1080 | .audit_skip = 1, |
e8c2bc1f | 1081 | .async_size = sizeof(struct io_timeout_data), |
d3656344 | 1082 | }, |
0463b6c5 | 1083 | [IORING_OP_CONNECT] = { |
d3656344 JA |
1084 | .needs_file = 1, |
1085 | .unbound_nonreg_file = 1, | |
8a72758c | 1086 | .pollout = 1, |
26f0505a | 1087 | .needs_async_setup = 1, |
e8c2bc1f | 1088 | .async_size = sizeof(struct io_async_connect), |
d3656344 | 1089 | }, |
0463b6c5 | 1090 | [IORING_OP_FALLOCATE] = { |
d3656344 | 1091 | .needs_file = 1, |
d3656344 | 1092 | }, |
44526bed JA |
1093 | [IORING_OP_OPENAT] = {}, |
1094 | [IORING_OP_CLOSE] = {}, | |
5bd2182d PM |
1095 | [IORING_OP_FILES_UPDATE] = { |
1096 | .audit_skip = 1, | |
1097 | }, | |
1098 | [IORING_OP_STATX] = { | |
1099 | .audit_skip = 1, | |
1100 | }, | |
0463b6c5 | 1101 | [IORING_OP_READ] = { |
3a6820f2 JA |
1102 | .needs_file = 1, |
1103 | .unbound_nonreg_file = 1, | |
8a72758c | 1104 | .pollin = 1, |
bcda7baa | 1105 | .buffer_select = 1, |
27926b68 | 1106 | .plug = 1, |
5bd2182d | 1107 | .audit_skip = 1, |
e8c2bc1f | 1108 | .async_size = sizeof(struct io_async_rw), |
3a6820f2 | 1109 | }, |
0463b6c5 | 1110 | [IORING_OP_WRITE] = { |
3a6820f2 | 1111 | .needs_file = 1, |
7b3188e7 | 1112 | .hash_reg_file = 1, |
3a6820f2 | 1113 | .unbound_nonreg_file = 1, |
8a72758c | 1114 | .pollout = 1, |
27926b68 | 1115 | .plug = 1, |
5bd2182d | 1116 | .audit_skip = 1, |
e8c2bc1f | 1117 | .async_size = sizeof(struct io_async_rw), |
3a6820f2 | 1118 | }, |
0463b6c5 | 1119 | [IORING_OP_FADVISE] = { |
4840e418 | 1120 | .needs_file = 1, |
5bd2182d | 1121 | .audit_skip = 1, |
c1ca757b | 1122 | }, |
44526bed | 1123 | [IORING_OP_MADVISE] = {}, |
0463b6c5 | 1124 | [IORING_OP_SEND] = { |
fddaface JA |
1125 | .needs_file = 1, |
1126 | .unbound_nonreg_file = 1, | |
8a72758c | 1127 | .pollout = 1, |
5bd2182d | 1128 | .audit_skip = 1, |
fddaface | 1129 | }, |
0463b6c5 | 1130 | [IORING_OP_RECV] = { |
fddaface JA |
1131 | .needs_file = 1, |
1132 | .unbound_nonreg_file = 1, | |
8a72758c | 1133 | .pollin = 1, |
bcda7baa | 1134 | .buffer_select = 1, |
5bd2182d | 1135 | .audit_skip = 1, |
fddaface | 1136 | }, |
0463b6c5 | 1137 | [IORING_OP_OPENAT2] = { |
cebdb986 | 1138 | }, |
3e4827b0 JA |
1139 | [IORING_OP_EPOLL_CTL] = { |
1140 | .unbound_nonreg_file = 1, | |
5bd2182d | 1141 | .audit_skip = 1, |
3e4827b0 | 1142 | }, |
7d67af2c PB |
1143 | [IORING_OP_SPLICE] = { |
1144 | .needs_file = 1, | |
1145 | .hash_reg_file = 1, | |
1146 | .unbound_nonreg_file = 1, | |
5bd2182d PM |
1147 | .audit_skip = 1, |
1148 | }, | |
1149 | [IORING_OP_PROVIDE_BUFFERS] = { | |
1150 | .audit_skip = 1, | |
1151 | }, | |
1152 | [IORING_OP_REMOVE_BUFFERS] = { | |
1153 | .audit_skip = 1, | |
ddf0322d | 1154 | }, |
f2a8d5c7 PB |
1155 | [IORING_OP_TEE] = { |
1156 | .needs_file = 1, | |
1157 | .hash_reg_file = 1, | |
1158 | .unbound_nonreg_file = 1, | |
5bd2182d | 1159 | .audit_skip = 1, |
f2a8d5c7 | 1160 | }, |
36f4fa68 JA |
1161 | [IORING_OP_SHUTDOWN] = { |
1162 | .needs_file = 1, | |
1163 | }, | |
44526bed JA |
1164 | [IORING_OP_RENAMEAT] = {}, |
1165 | [IORING_OP_UNLINKAT] = {}, | |
e34a02dc | 1166 | [IORING_OP_MKDIRAT] = {}, |
7a8721f8 | 1167 | [IORING_OP_SYMLINKAT] = {}, |
cf30da90 | 1168 | [IORING_OP_LINKAT] = {}, |
4f57f06c JA |
1169 | [IORING_OP_MSG_RING] = { |
1170 | .needs_file = 1, | |
1171 | }, | |
d3656344 JA |
1172 | }; |
1173 | ||
0756a869 PB |
1174 | /* requests with any of those set should undergo io_disarm_next() */ |
1175 | #define IO_DISARM_MASK (REQ_F_ARM_LTIMEOUT | REQ_F_LINK_TIMEOUT | REQ_F_FAIL) | |
1176 | ||
7a612350 | 1177 | static bool io_disarm_next(struct io_kiocb *req); |
eef51daa | 1178 | static void io_uring_del_tctx_node(unsigned long index); |
9936c7c2 PB |
1179 | static void io_uring_try_cancel_requests(struct io_ring_ctx *ctx, |
1180 | struct task_struct *task, | |
3dd0c97a | 1181 | bool cancel_all); |
78cc687b | 1182 | static void io_uring_cancel_generic(bool cancel_all, struct io_sq_data *sqd); |
1ffc5422 | 1183 | |
913a571a PB |
1184 | static void io_fill_cqe_req(struct io_kiocb *req, s32 res, u32 cflags); |
1185 | ||
ec9c02ad | 1186 | static void io_put_req(struct io_kiocb *req); |
91c2f697 | 1187 | static void io_put_req_deferred(struct io_kiocb *req); |
c7dae4ba | 1188 | static void io_dismantle_req(struct io_kiocb *req); |
94ae5e77 | 1189 | static void io_queue_linked_timeout(struct io_kiocb *req); |
fdecb662 | 1190 | static int __io_register_rsrc_update(struct io_ring_ctx *ctx, unsigned type, |
c3bdad02 | 1191 | struct io_uring_rsrc_update2 *up, |
98f0b3b4 | 1192 | unsigned nr_args); |
68fb8979 | 1193 | static void io_clean_op(struct io_kiocb *req); |
5106dd6e JA |
1194 | static inline struct file *io_file_get_fixed(struct io_kiocb *req, int fd, |
1195 | unsigned issue_flags); | |
1196 | static inline struct file *io_file_get_normal(struct io_kiocb *req, int fd); | |
d5361233 JA |
1197 | static void io_drop_inflight_file(struct io_kiocb *req); |
1198 | static bool io_assign_file(struct io_kiocb *req, unsigned int issue_flags); | |
c5eef2b9 | 1199 | static void __io_queue_sqe(struct io_kiocb *req); |
269bbe5f | 1200 | static void io_rsrc_put_work(struct work_struct *work); |
de0617e4 | 1201 | |
907d1df3 | 1202 | static void io_req_task_queue(struct io_kiocb *req); |
c450178d | 1203 | static void __io_submit_flush_completions(struct io_ring_ctx *ctx); |
179ae0d1 | 1204 | static int io_req_prep_async(struct io_kiocb *req); |
de0617e4 | 1205 | |
b9445598 PB |
1206 | static int io_install_fixed_file(struct io_kiocb *req, struct file *file, |
1207 | unsigned int issue_flags, u32 slot_index); | |
7df778be PB |
1208 | static int io_close_fixed(struct io_kiocb *req, unsigned int issue_flags); |
1209 | ||
f1042b6c | 1210 | static enum hrtimer_restart io_link_timeout_fn(struct hrtimer *timer); |
9aa8dfde | 1211 | static void io_eventfd_signal(struct io_ring_ctx *ctx); |
b9445598 | 1212 | |
2b188cc1 JA |
1213 | static struct kmem_cache *req_cachep; |
1214 | ||
0918682b | 1215 | static const struct file_operations io_uring_fops; |
2b188cc1 JA |
1216 | |
1217 | struct sock *io_uring_get_socket(struct file *file) | |
1218 | { | |
1219 | #if defined(CONFIG_UNIX) | |
1220 | if (file->f_op == &io_uring_fops) { | |
1221 | struct io_ring_ctx *ctx = file->private_data; | |
1222 | ||
1223 | return ctx->ring_sock->sk; | |
1224 | } | |
1225 | #endif | |
1226 | return NULL; | |
1227 | } | |
1228 | EXPORT_SYMBOL(io_uring_get_socket); | |
1229 | ||
1f59bc0f PB |
1230 | #if defined(CONFIG_UNIX) |
1231 | static inline bool io_file_need_scm(struct file *filp) | |
1232 | { | |
1233 | return !!unix_get_socket(filp); | |
1234 | } | |
1235 | #else | |
1236 | static inline bool io_file_need_scm(struct file *filp) | |
1237 | { | |
1238 | return 0; | |
1239 | } | |
1240 | #endif | |
1241 | ||
f8929630 PB |
1242 | static void io_ring_submit_unlock(struct io_ring_ctx *ctx, unsigned issue_flags) |
1243 | { | |
1244 | lockdep_assert_held(&ctx->uring_lock); | |
1245 | if (issue_flags & IO_URING_F_UNLOCKED) | |
1246 | mutex_unlock(&ctx->uring_lock); | |
1247 | } | |
1248 | ||
1249 | static void io_ring_submit_lock(struct io_ring_ctx *ctx, unsigned issue_flags) | |
1250 | { | |
1251 | /* | |
1252 | * "Normal" inline submissions always hold the uring_lock, since we | |
1253 | * grab it from the system call. Same is true for the SQPOLL offload. | |
1254 | * The only exception is when we've detached the request and issue it | |
1255 | * from an async worker thread, grab the lock for that case. | |
1256 | */ | |
1257 | if (issue_flags & IO_URING_F_UNLOCKED) | |
1258 | mutex_lock(&ctx->uring_lock); | |
1259 | lockdep_assert_held(&ctx->uring_lock); | |
1260 | } | |
1261 | ||
f237c30a PB |
1262 | static inline void io_tw_lock(struct io_ring_ctx *ctx, bool *locked) |
1263 | { | |
1264 | if (!*locked) { | |
1265 | mutex_lock(&ctx->uring_lock); | |
1266 | *locked = true; | |
1267 | } | |
1268 | } | |
1269 | ||
f2f87370 PB |
1270 | #define io_for_each_link(pos, head) \ |
1271 | for (pos = (head); pos; pos = pos->link) | |
1272 | ||
21c843d5 PB |
1273 | /* |
1274 | * Shamelessly stolen from the mm implementation of page reference checking, | |
1275 | * see commit f958d7b528b1 for details. | |
1276 | */ | |
1277 | #define req_ref_zero_or_close_to_overflow(req) \ | |
1278 | ((unsigned int) atomic_read(&(req->refs)) + 127u <= 127u) | |
1279 | ||
1280 | static inline bool req_ref_inc_not_zero(struct io_kiocb *req) | |
1281 | { | |
20e60a38 | 1282 | WARN_ON_ONCE(!(req->flags & REQ_F_REFCOUNT)); |
21c843d5 PB |
1283 | return atomic_inc_not_zero(&req->refs); |
1284 | } | |
1285 | ||
21c843d5 PB |
1286 | static inline bool req_ref_put_and_test(struct io_kiocb *req) |
1287 | { | |
20e60a38 PB |
1288 | if (likely(!(req->flags & REQ_F_REFCOUNT))) |
1289 | return true; | |
1290 | ||
21c843d5 PB |
1291 | WARN_ON_ONCE(req_ref_zero_or_close_to_overflow(req)); |
1292 | return atomic_dec_and_test(&req->refs); | |
1293 | } | |
1294 | ||
21c843d5 PB |
1295 | static inline void req_ref_get(struct io_kiocb *req) |
1296 | { | |
20e60a38 | 1297 | WARN_ON_ONCE(!(req->flags & REQ_F_REFCOUNT)); |
21c843d5 PB |
1298 | WARN_ON_ONCE(req_ref_zero_or_close_to_overflow(req)); |
1299 | atomic_inc(&req->refs); | |
1300 | } | |
1301 | ||
c450178d PB |
1302 | static inline void io_submit_flush_completions(struct io_ring_ctx *ctx) |
1303 | { | |
6f33b0bc | 1304 | if (!wq_list_empty(&ctx->submit_state.compl_reqs)) |
c450178d PB |
1305 | __io_submit_flush_completions(ctx); |
1306 | } | |
1307 | ||
48dcd38d | 1308 | static inline void __io_req_set_refcount(struct io_kiocb *req, int nr) |
20e60a38 PB |
1309 | { |
1310 | if (!(req->flags & REQ_F_REFCOUNT)) { | |
1311 | req->flags |= REQ_F_REFCOUNT; | |
48dcd38d | 1312 | atomic_set(&req->refs, nr); |
20e60a38 PB |
1313 | } |
1314 | } | |
1315 | ||
48dcd38d PB |
1316 | static inline void io_req_set_refcount(struct io_kiocb *req) |
1317 | { | |
1318 | __io_req_set_refcount(req, 1); | |
1319 | } | |
1320 | ||
ab409402 PB |
1321 | #define IO_RSRC_REF_BATCH 100 |
1322 | ||
1323 | static inline void io_req_put_rsrc_locked(struct io_kiocb *req, | |
1324 | struct io_ring_ctx *ctx) | |
1325 | __must_hold(&ctx->uring_lock) | |
36f72fe2 | 1326 | { |
ab409402 PB |
1327 | struct percpu_ref *ref = req->fixed_rsrc_refs; |
1328 | ||
1329 | if (ref) { | |
1330 | if (ref == &ctx->rsrc_node->refs) | |
1331 | ctx->rsrc_cached_refs++; | |
1332 | else | |
1333 | percpu_ref_put(ref); | |
1334 | } | |
1335 | } | |
1336 | ||
1337 | static inline void io_req_put_rsrc(struct io_kiocb *req, struct io_ring_ctx *ctx) | |
1338 | { | |
1339 | if (req->fixed_rsrc_refs) | |
1340 | percpu_ref_put(req->fixed_rsrc_refs); | |
1341 | } | |
1342 | ||
1343 | static __cold void io_rsrc_refs_drop(struct io_ring_ctx *ctx) | |
1344 | __must_hold(&ctx->uring_lock) | |
1345 | { | |
1346 | if (ctx->rsrc_cached_refs) { | |
1347 | percpu_ref_put_many(&ctx->rsrc_node->refs, ctx->rsrc_cached_refs); | |
1348 | ctx->rsrc_cached_refs = 0; | |
1349 | } | |
1350 | } | |
1351 | ||
1352 | static void io_rsrc_refs_refill(struct io_ring_ctx *ctx) | |
1353 | __must_hold(&ctx->uring_lock) | |
1354 | { | |
1355 | ctx->rsrc_cached_refs += IO_RSRC_REF_BATCH; | |
1356 | percpu_ref_get_many(&ctx->rsrc_node->refs, IO_RSRC_REF_BATCH); | |
1357 | } | |
36f72fe2 | 1358 | |
a46be971 | 1359 | static inline void io_req_set_rsrc_node(struct io_kiocb *req, |
5106dd6e JA |
1360 | struct io_ring_ctx *ctx, |
1361 | unsigned int issue_flags) | |
36f72fe2 | 1362 | { |
269bbe5f | 1363 | if (!req->fixed_rsrc_refs) { |
a7f0ed5a | 1364 | req->fixed_rsrc_refs = &ctx->rsrc_node->refs; |
5106dd6e JA |
1365 | |
1366 | if (!(issue_flags & IO_URING_F_UNLOCKED)) { | |
1367 | lockdep_assert_held(&ctx->uring_lock); | |
1368 | ctx->rsrc_cached_refs--; | |
1369 | if (unlikely(ctx->rsrc_cached_refs < 0)) | |
1370 | io_rsrc_refs_refill(ctx); | |
1371 | } else { | |
1372 | percpu_ref_get(req->fixed_rsrc_refs); | |
1373 | } | |
36f72fe2 PB |
1374 | } |
1375 | } | |
1376 | ||
cc3cec83 | 1377 | static unsigned int __io_put_kbuf(struct io_kiocb *req, struct list_head *list) |
3648e526 | 1378 | { |
d1fd1c20 | 1379 | struct io_buffer *kbuf = req->kbuf; |
3648e526 HX |
1380 | unsigned int cflags; |
1381 | ||
cc3cec83 | 1382 | cflags = IORING_CQE_F_BUFFER | (kbuf->bid << IORING_CQE_BUFFER_SHIFT); |
3648e526 | 1383 | req->flags &= ~REQ_F_BUFFER_SELECTED; |
cc3cec83 | 1384 | list_add(&kbuf->list, list); |
d1fd1c20 | 1385 | req->kbuf = NULL; |
3648e526 HX |
1386 | return cflags; |
1387 | } | |
1388 | ||
cc3cec83 | 1389 | static inline unsigned int io_put_kbuf_comp(struct io_kiocb *req) |
3648e526 | 1390 | { |
8197b053 PB |
1391 | lockdep_assert_held(&req->ctx->completion_lock); |
1392 | ||
3648e526 HX |
1393 | if (likely(!(req->flags & REQ_F_BUFFER_SELECTED))) |
1394 | return 0; | |
cc3cec83 JA |
1395 | return __io_put_kbuf(req, &req->ctx->io_buffers_comp); |
1396 | } | |
1397 | ||
1398 | static inline unsigned int io_put_kbuf(struct io_kiocb *req, | |
1399 | unsigned issue_flags) | |
1400 | { | |
1401 | unsigned int cflags; | |
1402 | ||
1403 | if (likely(!(req->flags & REQ_F_BUFFER_SELECTED))) | |
1404 | return 0; | |
1405 | ||
1406 | /* | |
1407 | * We can add this buffer back to two lists: | |
1408 | * | |
1409 | * 1) The io_buffers_cache list. This one is protected by the | |
1410 | * ctx->uring_lock. If we already hold this lock, add back to this | |
1411 | * list as we can grab it from issue as well. | |
1412 | * 2) The io_buffers_comp list. This one is protected by the | |
1413 | * ctx->completion_lock. | |
1414 | * | |
1415 | * We migrate buffers from the comp_list to the issue cache list | |
1416 | * when we need one. | |
1417 | */ | |
1418 | if (issue_flags & IO_URING_F_UNLOCKED) { | |
1419 | struct io_ring_ctx *ctx = req->ctx; | |
1420 | ||
1421 | spin_lock(&ctx->completion_lock); | |
1422 | cflags = __io_put_kbuf(req, &ctx->io_buffers_comp); | |
1423 | spin_unlock(&ctx->completion_lock); | |
1424 | } else { | |
ab0ac095 PB |
1425 | lockdep_assert_held(&req->ctx->uring_lock); |
1426 | ||
cc3cec83 JA |
1427 | cflags = __io_put_kbuf(req, &req->ctx->io_buffers_cache); |
1428 | } | |
1429 | ||
1430 | return cflags; | |
3648e526 HX |
1431 | } |
1432 | ||
dbc7d452 JA |
1433 | static struct io_buffer_list *io_buffer_get_list(struct io_ring_ctx *ctx, |
1434 | unsigned int bgid) | |
1435 | { | |
1436 | struct list_head *hash_list; | |
1437 | struct io_buffer_list *bl; | |
1438 | ||
1439 | hash_list = &ctx->io_buffers[hash_32(bgid, IO_BUFFERS_HASH_BITS)]; | |
1440 | list_for_each_entry(bl, hash_list, list) | |
1441 | if (bl->bgid == bgid || bgid == -1U) | |
1442 | return bl; | |
1443 | ||
1444 | return NULL; | |
1445 | } | |
1446 | ||
4d55f238 | 1447 | static void io_kbuf_recycle(struct io_kiocb *req, unsigned issue_flags) |
b1c62645 JA |
1448 | { |
1449 | struct io_ring_ctx *ctx = req->ctx; | |
dbc7d452 JA |
1450 | struct io_buffer_list *bl; |
1451 | struct io_buffer *buf; | |
b1c62645 JA |
1452 | |
1453 | if (likely(!(req->flags & REQ_F_BUFFER_SELECTED))) | |
1454 | return; | |
8a3e8ee5 JA |
1455 | /* don't recycle if we already did IO to this buffer */ |
1456 | if (req->flags & REQ_F_PARTIAL_IO) | |
1457 | return; | |
b1c62645 | 1458 | |
f8929630 | 1459 | io_ring_submit_lock(ctx, issue_flags); |
b1c62645 JA |
1460 | |
1461 | buf = req->kbuf; | |
dbc7d452 JA |
1462 | bl = io_buffer_get_list(ctx, buf->bgid); |
1463 | list_add(&buf->list, &bl->buf_list); | |
b1c62645 JA |
1464 | req->flags &= ~REQ_F_BUFFER_SELECTED; |
1465 | req->kbuf = NULL; | |
4d55f238 | 1466 | |
f8929630 | 1467 | io_ring_submit_unlock(ctx, issue_flags); |
b1c62645 JA |
1468 | } |
1469 | ||
3dd0c97a PB |
1470 | static bool io_match_task(struct io_kiocb *head, struct task_struct *task, |
1471 | bool cancel_all) | |
6af3f48b | 1472 | __must_hold(&req->ctx->timeout_lock) |
08d23634 | 1473 | { |
68207680 | 1474 | if (task && head->task != task) |
08d23634 | 1475 | return false; |
d5361233 | 1476 | return cancel_all; |
6af3f48b PB |
1477 | } |
1478 | ||
1479 | /* | |
1480 | * As io_match_task() but protected against racing with linked timeouts. | |
1481 | * User must not hold timeout_lock. | |
1482 | */ | |
1483 | static bool io_match_task_safe(struct io_kiocb *head, struct task_struct *task, | |
1484 | bool cancel_all) | |
1485 | { | |
6af3f48b PB |
1486 | if (task && head->task != task) |
1487 | return false; | |
d5361233 | 1488 | return cancel_all; |
6af3f48b PB |
1489 | } |
1490 | ||
d886e185 PB |
1491 | static inline bool req_has_async_data(struct io_kiocb *req) |
1492 | { | |
1493 | return req->flags & REQ_F_ASYNC_DATA; | |
1494 | } | |
1495 | ||
93d2bcd2 | 1496 | static inline void req_set_fail(struct io_kiocb *req) |
c40f6379 | 1497 | { |
93d2bcd2 | 1498 | req->flags |= REQ_F_FAIL; |
04c76b41 PB |
1499 | if (req->flags & REQ_F_CQE_SKIP) { |
1500 | req->flags &= ~REQ_F_CQE_SKIP; | |
1501 | req->flags |= REQ_F_SKIP_LINK_CQES; | |
1502 | } | |
c40f6379 | 1503 | } |
4a38aed2 | 1504 | |
a8295b98 HX |
1505 | static inline void req_fail_link_node(struct io_kiocb *req, int res) |
1506 | { | |
1507 | req_set_fail(req); | |
cef216fc | 1508 | req->cqe.res = res; |
a8295b98 HX |
1509 | } |
1510 | ||
c072481d | 1511 | static __cold void io_ring_ctx_ref_free(struct percpu_ref *ref) |
2b188cc1 JA |
1512 | { |
1513 | struct io_ring_ctx *ctx = container_of(ref, struct io_ring_ctx, refs); | |
1514 | ||
0f158b4c | 1515 | complete(&ctx->ref_comp); |
2b188cc1 JA |
1516 | } |
1517 | ||
8eb7e2d0 PB |
1518 | static inline bool io_is_timeout_noseq(struct io_kiocb *req) |
1519 | { | |
1520 | return !req->timeout.off; | |
1521 | } | |
1522 | ||
c072481d | 1523 | static __cold void io_fallback_req_func(struct work_struct *work) |
f56165e6 PB |
1524 | { |
1525 | struct io_ring_ctx *ctx = container_of(work, struct io_ring_ctx, | |
1526 | fallback_work.work); | |
1527 | struct llist_node *node = llist_del_all(&ctx->fallback_llist); | |
1528 | struct io_kiocb *req, *tmp; | |
f237c30a | 1529 | bool locked = false; |
f56165e6 PB |
1530 | |
1531 | percpu_ref_get(&ctx->refs); | |
1532 | llist_for_each_entry_safe(req, tmp, node, io_task_work.fallback_node) | |
f237c30a | 1533 | req->io_task_work.func(req, &locked); |
5636c00d | 1534 | |
f237c30a | 1535 | if (locked) { |
c450178d | 1536 | io_submit_flush_completions(ctx); |
f237c30a PB |
1537 | mutex_unlock(&ctx->uring_lock); |
1538 | } | |
f56165e6 PB |
1539 | percpu_ref_put(&ctx->refs); |
1540 | } | |
1541 | ||
c072481d | 1542 | static __cold struct io_ring_ctx *io_ring_ctx_alloc(struct io_uring_params *p) |
2b188cc1 JA |
1543 | { |
1544 | struct io_ring_ctx *ctx; | |
dbc7d452 | 1545 | int i, hash_bits; |
2b188cc1 JA |
1546 | |
1547 | ctx = kzalloc(sizeof(*ctx), GFP_KERNEL); | |
1548 | if (!ctx) | |
1549 | return NULL; | |
1550 | ||
78076bb6 JA |
1551 | /* |
1552 | * Use 5 bits less than the max cq entries, that should give us around | |
1553 | * 32 entries per hash list if totally full and uniformly spread. | |
1554 | */ | |
1555 | hash_bits = ilog2(p->cq_entries); | |
1556 | hash_bits -= 5; | |
1557 | if (hash_bits <= 0) | |
1558 | hash_bits = 1; | |
1559 | ctx->cancel_hash_bits = hash_bits; | |
1560 | ctx->cancel_hash = kmalloc((1U << hash_bits) * sizeof(struct hlist_head), | |
1561 | GFP_KERNEL); | |
1562 | if (!ctx->cancel_hash) | |
1563 | goto err; | |
1564 | __hash_init(ctx->cancel_hash, 1U << hash_bits); | |
1565 | ||
6224843d PB |
1566 | ctx->dummy_ubuf = kzalloc(sizeof(*ctx->dummy_ubuf), GFP_KERNEL); |
1567 | if (!ctx->dummy_ubuf) | |
1568 | goto err; | |
1569 | /* set invalid range, so io_import_fixed() fails meeting it */ | |
1570 | ctx->dummy_ubuf->ubuf = -1UL; | |
1571 | ||
dbc7d452 JA |
1572 | ctx->io_buffers = kcalloc(1U << IO_BUFFERS_HASH_BITS, |
1573 | sizeof(struct list_head), GFP_KERNEL); | |
1574 | if (!ctx->io_buffers) | |
1575 | goto err; | |
1576 | for (i = 0; i < (1U << IO_BUFFERS_HASH_BITS); i++) | |
1577 | INIT_LIST_HEAD(&ctx->io_buffers[i]); | |
1578 | ||
21482896 | 1579 | if (percpu_ref_init(&ctx->refs, io_ring_ctx_ref_free, |
206aefde JA |
1580 | PERCPU_REF_ALLOW_REINIT, GFP_KERNEL)) |
1581 | goto err; | |
2b188cc1 JA |
1582 | |
1583 | ctx->flags = p->flags; | |
90554200 | 1584 | init_waitqueue_head(&ctx->sqo_sq_wait); |
69fb2131 | 1585 | INIT_LIST_HEAD(&ctx->sqd_list); |
1d7bb1d5 | 1586 | INIT_LIST_HEAD(&ctx->cq_overflow_list); |
cc3cec83 | 1587 | INIT_LIST_HEAD(&ctx->io_buffers_cache); |
4d9237e3 | 1588 | INIT_LIST_HEAD(&ctx->apoll_cache); |
0f158b4c | 1589 | init_completion(&ctx->ref_comp); |
61cf9370 | 1590 | xa_init_flags(&ctx->personalities, XA_FLAGS_ALLOC1); |
2b188cc1 | 1591 | mutex_init(&ctx->uring_lock); |
311997b3 | 1592 | init_waitqueue_head(&ctx->cq_wait); |
2b188cc1 | 1593 | spin_lock_init(&ctx->completion_lock); |
89850fce | 1594 | spin_lock_init(&ctx->timeout_lock); |
5eef4e87 | 1595 | INIT_WQ_LIST(&ctx->iopoll_list); |
cc3cec83 JA |
1596 | INIT_LIST_HEAD(&ctx->io_buffers_pages); |
1597 | INIT_LIST_HEAD(&ctx->io_buffers_comp); | |
de0617e4 | 1598 | INIT_LIST_HEAD(&ctx->defer_list); |
5262f567 | 1599 | INIT_LIST_HEAD(&ctx->timeout_list); |
ef9dd637 | 1600 | INIT_LIST_HEAD(&ctx->ltimeout_list); |
d67d2263 BM |
1601 | spin_lock_init(&ctx->rsrc_ref_lock); |
1602 | INIT_LIST_HEAD(&ctx->rsrc_ref_list); | |
269bbe5f BM |
1603 | INIT_DELAYED_WORK(&ctx->rsrc_put_work, io_rsrc_put_work); |
1604 | init_llist_head(&ctx->rsrc_put_llist); | |
13bf43f5 | 1605 | INIT_LIST_HEAD(&ctx->tctx_list); |
c2b6c6bc PB |
1606 | ctx->submit_state.free_list.next = NULL; |
1607 | INIT_WQ_LIST(&ctx->locked_free_list); | |
9011bf9a | 1608 | INIT_DELAYED_WORK(&ctx->fallback_work, io_fallback_req_func); |
6f33b0bc | 1609 | INIT_WQ_LIST(&ctx->submit_state.compl_reqs); |
2b188cc1 | 1610 | return ctx; |
206aefde | 1611 | err: |
6224843d | 1612 | kfree(ctx->dummy_ubuf); |
78076bb6 | 1613 | kfree(ctx->cancel_hash); |
dbc7d452 | 1614 | kfree(ctx->io_buffers); |
206aefde JA |
1615 | kfree(ctx); |
1616 | return NULL; | |
2b188cc1 JA |
1617 | } |
1618 | ||
8f6ed49a PB |
1619 | static void io_account_cq_overflow(struct io_ring_ctx *ctx) |
1620 | { | |
1621 | struct io_rings *r = ctx->rings; | |
1622 | ||
1623 | WRITE_ONCE(r->cq_overflow, READ_ONCE(r->cq_overflow) + 1); | |
1624 | ctx->cq_extra--; | |
1625 | } | |
1626 | ||
9cf7c104 | 1627 | static bool req_need_defer(struct io_kiocb *req, u32 seq) |
7adf4eaf | 1628 | { |
2bc9930e JA |
1629 | if (unlikely(req->flags & REQ_F_IO_DRAIN)) { |
1630 | struct io_ring_ctx *ctx = req->ctx; | |
a197f664 | 1631 | |
8f6ed49a | 1632 | return seq + READ_ONCE(ctx->cq_extra) != ctx->cached_cq_tail; |
2bc9930e | 1633 | } |
de0617e4 | 1634 | |
9d858b21 | 1635 | return false; |
de0617e4 JA |
1636 | } |
1637 | ||
35645ac3 PB |
1638 | #define FFS_NOWAIT 0x1UL |
1639 | #define FFS_ISREG 0x2UL | |
1640 | #define FFS_MASK ~(FFS_NOWAIT|FFS_ISREG) | |
c97d8a0f PB |
1641 | |
1642 | static inline bool io_req_ffs_set(struct io_kiocb *req) | |
1643 | { | |
35645ac3 | 1644 | return req->flags & REQ_F_FIXED_FILE; |
c97d8a0f PB |
1645 | } |
1646 | ||
fd08e530 PB |
1647 | static struct io_kiocb *__io_prep_linked_timeout(struct io_kiocb *req) |
1648 | { | |
906c6caa PB |
1649 | if (WARN_ON_ONCE(!req->link)) |
1650 | return NULL; | |
1651 | ||
4d13d1a4 PB |
1652 | req->flags &= ~REQ_F_ARM_LTIMEOUT; |
1653 | req->flags |= REQ_F_LINK_TIMEOUT; | |
fd08e530 PB |
1654 | |
1655 | /* linked timeouts should have two refs once prep'ed */ | |
48dcd38d | 1656 | io_req_set_refcount(req); |
4d13d1a4 PB |
1657 | __io_req_set_refcount(req->link, 2); |
1658 | return req->link; | |
fd08e530 PB |
1659 | } |
1660 | ||
1661 | static inline struct io_kiocb *io_prep_linked_timeout(struct io_kiocb *req) | |
1662 | { | |
4d13d1a4 | 1663 | if (likely(!(req->flags & REQ_F_ARM_LTIMEOUT))) |
fd08e530 PB |
1664 | return NULL; |
1665 | return __io_prep_linked_timeout(req); | |
1666 | } | |
1667 | ||
1e6fa521 JA |
1668 | static void io_prep_async_work(struct io_kiocb *req) |
1669 | { | |
1670 | const struct io_op_def *def = &io_op_defs[req->opcode]; | |
1e6fa521 JA |
1671 | struct io_ring_ctx *ctx = req->ctx; |
1672 | ||
b8e64b53 PB |
1673 | if (!(req->flags & REQ_F_CREDS)) { |
1674 | req->flags |= REQ_F_CREDS; | |
c10d1f98 | 1675 | req->creds = get_current_cred(); |
b8e64b53 | 1676 | } |
003e8dcc | 1677 | |
e1d675df PB |
1678 | req->work.list.next = NULL; |
1679 | req->work.flags = 0; | |
feaadc4f PB |
1680 | if (req->flags & REQ_F_FORCE_ASYNC) |
1681 | req->work.flags |= IO_WQ_WORK_CONCURRENT; | |
1682 | ||
1e6fa521 JA |
1683 | if (req->flags & REQ_F_ISREG) { |
1684 | if (def->hash_reg_file || (ctx->flags & IORING_SETUP_IOPOLL)) | |
1685 | io_wq_hash_work(&req->work, file_inode(req->file)); | |
4b982bd0 | 1686 | } else if (!req->file || !S_ISBLK(file_inode(req->file)->i_mode)) { |
1e6fa521 JA |
1687 | if (def->unbound_nonreg_file) |
1688 | req->work.flags |= IO_WQ_WORK_UNBOUND; | |
1689 | } | |
561fb04a | 1690 | } |
cccf0ee8 | 1691 | |
cbdcb435 | 1692 | static void io_prep_async_link(struct io_kiocb *req) |
561fb04a | 1693 | { |
cbdcb435 | 1694 | struct io_kiocb *cur; |
54a91f3b | 1695 | |
44eff40a PB |
1696 | if (req->flags & REQ_F_LINK_TIMEOUT) { |
1697 | struct io_ring_ctx *ctx = req->ctx; | |
1698 | ||
674ee8e1 | 1699 | spin_lock_irq(&ctx->timeout_lock); |
44eff40a PB |
1700 | io_for_each_link(cur, req) |
1701 | io_prep_async_work(cur); | |
674ee8e1 | 1702 | spin_unlock_irq(&ctx->timeout_lock); |
44eff40a PB |
1703 | } else { |
1704 | io_for_each_link(cur, req) | |
1705 | io_prep_async_work(cur); | |
1706 | } | |
561fb04a JA |
1707 | } |
1708 | ||
fff4e40e PB |
1709 | static inline void io_req_add_compl_list(struct io_kiocb *req) |
1710 | { | |
775a1f2f | 1711 | struct io_submit_state *state = &req->ctx->submit_state; |
fff4e40e | 1712 | |
3d4aeb9f | 1713 | if (!(req->flags & REQ_F_CQE_SKIP)) |
775a1f2f | 1714 | state->flush_cqes = true; |
fff4e40e PB |
1715 | wq_list_add_tail(&req->comp_list, &state->compl_reqs); |
1716 | } | |
1717 | ||
00169246 | 1718 | static void io_queue_async_work(struct io_kiocb *req, bool *dont_use) |
561fb04a | 1719 | { |
a197f664 | 1720 | struct io_ring_ctx *ctx = req->ctx; |
cbdcb435 | 1721 | struct io_kiocb *link = io_prep_linked_timeout(req); |
5aa75ed5 | 1722 | struct io_uring_task *tctx = req->task->io_uring; |
561fb04a | 1723 | |
3bfe6106 JA |
1724 | BUG_ON(!tctx); |
1725 | BUG_ON(!tctx->io_wq); | |
561fb04a | 1726 | |
cbdcb435 PB |
1727 | /* init ->work of the whole link before punting */ |
1728 | io_prep_async_link(req); | |
991468dc JA |
1729 | |
1730 | /* | |
1731 | * Not expected to happen, but if we do have a bug where this _can_ | |
1732 | * happen, catch it here and ensure the request is marked as | |
1733 | * canceled. That will make io-wq go through the usual work cancel | |
1734 | * procedure rather than attempt to run this request (or create a new | |
1735 | * worker for it). | |
1736 | */ | |
1737 | if (WARN_ON_ONCE(!same_thread_group(req->task, current))) | |
1738 | req->work.flags |= IO_WQ_WORK_CANCEL; | |
1739 | ||
cef216fc | 1740 | trace_io_uring_queue_async_work(ctx, req, req->cqe.user_data, req->opcode, req->flags, |
502c87d6 | 1741 | &req->work, io_wq_is_hashed(&req->work)); |
ebf93667 | 1742 | io_wq_enqueue(tctx->io_wq, &req->work); |
7271ef3a JA |
1743 | if (link) |
1744 | io_queue_linked_timeout(link); | |
cbdcb435 PB |
1745 | } |
1746 | ||
1ee4160c | 1747 | static void io_kill_timeout(struct io_kiocb *req, int status) |
8c855885 | 1748 | __must_hold(&req->ctx->completion_lock) |
89850fce | 1749 | __must_hold(&req->ctx->timeout_lock) |
5262f567 | 1750 | { |
e8c2bc1f | 1751 | struct io_timeout_data *io = req->async_data; |
5262f567 | 1752 | |
fd9c7bc5 | 1753 | if (hrtimer_try_to_cancel(&io->timer) != -1) { |
2ae2eb9d PB |
1754 | if (status) |
1755 | req_set_fail(req); | |
01cec8c1 PB |
1756 | atomic_set(&req->ctx->cq_timeouts, |
1757 | atomic_read(&req->ctx->cq_timeouts) + 1); | |
135fcde8 | 1758 | list_del_init(&req->timeout.list); |
913a571a | 1759 | io_fill_cqe_req(req, status, 0); |
91c2f697 | 1760 | io_put_req_deferred(req); |
5262f567 JA |
1761 | } |
1762 | } | |
1763 | ||
c072481d | 1764 | static __cold void io_queue_deferred(struct io_ring_ctx *ctx) |
de0617e4 | 1765 | { |
441b8a78 | 1766 | while (!list_empty(&ctx->defer_list)) { |
27dc8338 PB |
1767 | struct io_defer_entry *de = list_first_entry(&ctx->defer_list, |
1768 | struct io_defer_entry, list); | |
de0617e4 | 1769 | |
9cf7c104 | 1770 | if (req_need_defer(de->req, de->seq)) |
04518945 | 1771 | break; |
27dc8338 | 1772 | list_del_init(&de->list); |
907d1df3 | 1773 | io_req_task_queue(de->req); |
27dc8338 | 1774 | kfree(de); |
441b8a78 | 1775 | } |
04518945 PB |
1776 | } |
1777 | ||
c072481d | 1778 | static __cold void io_flush_timeouts(struct io_ring_ctx *ctx) |
89850fce | 1779 | __must_hold(&ctx->completion_lock) |
de0617e4 | 1780 | { |
441b8a78 | 1781 | u32 seq = ctx->cached_cq_tail - atomic_read(&ctx->cq_timeouts); |
e677edbc | 1782 | struct io_kiocb *req, *tmp; |
f010505b | 1783 | |
79ebeaee | 1784 | spin_lock_irq(&ctx->timeout_lock); |
e677edbc | 1785 | list_for_each_entry_safe(req, tmp, &ctx->timeout_list, timeout.list) { |
f010505b | 1786 | u32 events_needed, events_got; |
de0617e4 | 1787 | |
8eb7e2d0 | 1788 | if (io_is_timeout_noseq(req)) |
360428f8 | 1789 | break; |
f010505b MDG |
1790 | |
1791 | /* | |
1792 | * Since seq can easily wrap around over time, subtract | |
1793 | * the last seq at which timeouts were flushed before comparing. | |
1794 | * Assuming not more than 2^31-1 events have happened since, | |
1795 | * these subtractions won't have wrapped, so we can check if | |
1796 | * target is in [last_seq, current_seq] by comparing the two. | |
1797 | */ | |
1798 | events_needed = req->timeout.target_seq - ctx->cq_last_tm_flush; | |
1799 | events_got = seq - ctx->cq_last_tm_flush; | |
1800 | if (events_got < events_needed) | |
360428f8 | 1801 | break; |
bfe68a22 | 1802 | |
1ee4160c | 1803 | io_kill_timeout(req, 0); |
f18ee4cf | 1804 | } |
f010505b | 1805 | ctx->cq_last_tm_flush = seq; |
79ebeaee | 1806 | spin_unlock_irq(&ctx->timeout_lock); |
360428f8 | 1807 | } |
5262f567 | 1808 | |
9333f6b4 PB |
1809 | static inline void io_commit_cqring(struct io_ring_ctx *ctx) |
1810 | { | |
1811 | /* order cqe stores with ring update */ | |
1812 | smp_store_release(&ctx->rings->cq.tail, ctx->cached_cq_tail); | |
1813 | } | |
1814 | ||
9aa8dfde | 1815 | static void __io_commit_cqring_flush(struct io_ring_ctx *ctx) |
360428f8 | 1816 | { |
9aa8dfde PB |
1817 | if (ctx->off_timeout_used || ctx->drain_active) { |
1818 | spin_lock(&ctx->completion_lock); | |
1819 | if (ctx->off_timeout_used) | |
1820 | io_flush_timeouts(ctx); | |
1821 | if (ctx->drain_active) | |
1822 | io_queue_deferred(ctx); | |
1823 | io_commit_cqring(ctx); | |
1824 | spin_unlock(&ctx->completion_lock); | |
1825 | } | |
1826 | if (ctx->has_evfd) | |
1827 | io_eventfd_signal(ctx); | |
de0617e4 JA |
1828 | } |
1829 | ||
90554200 JA |
1830 | static inline bool io_sqring_full(struct io_ring_ctx *ctx) |
1831 | { | |
1832 | struct io_rings *r = ctx->rings; | |
1833 | ||
a566c556 | 1834 | return READ_ONCE(r->sq.tail) - ctx->cached_sq_head == ctx->sq_entries; |
90554200 JA |
1835 | } |
1836 | ||
888aae2e PB |
1837 | static inline unsigned int __io_cqring_events(struct io_ring_ctx *ctx) |
1838 | { | |
1839 | return ctx->cached_cq_tail - READ_ONCE(ctx->rings->cq.head); | |
1840 | } | |
1841 | ||
d068b506 | 1842 | static inline struct io_uring_cqe *io_get_cqe(struct io_ring_ctx *ctx) |
2b188cc1 | 1843 | { |
75b28aff | 1844 | struct io_rings *rings = ctx->rings; |
ea5ab3b5 | 1845 | unsigned tail, mask = ctx->cq_entries - 1; |
2b188cc1 | 1846 | |
115e12e5 SB |
1847 | /* |
1848 | * writes to the cq entry need to come after reading head; the | |
1849 | * control dependency is enough as we're using WRITE_ONCE to | |
1850 | * fill the cq entry | |
1851 | */ | |
a566c556 | 1852 | if (__io_cqring_events(ctx) == ctx->cq_entries) |
2b188cc1 JA |
1853 | return NULL; |
1854 | ||
888aae2e | 1855 | tail = ctx->cached_cq_tail++; |
ea5ab3b5 | 1856 | return &rings->cqes[tail & mask]; |
2b188cc1 JA |
1857 | } |
1858 | ||
77bc59b4 | 1859 | static void io_eventfd_signal(struct io_ring_ctx *ctx) |
f2842ab5 | 1860 | { |
77bc59b4 UA |
1861 | struct io_ev_fd *ev_fd; |
1862 | ||
77bc59b4 UA |
1863 | rcu_read_lock(); |
1864 | /* | |
1865 | * rcu_dereference ctx->io_ev_fd once and use it for both for checking | |
1866 | * and eventfd_signal | |
1867 | */ | |
1868 | ev_fd = rcu_dereference(ctx->io_ev_fd); | |
1869 | ||
1870 | /* | |
1871 | * Check again if ev_fd exists incase an io_eventfd_unregister call | |
1872 | * completed between the NULL check of ctx->io_ev_fd at the start of | |
1873 | * the function and rcu_read_lock. | |
1874 | */ | |
1875 | if (unlikely(!ev_fd)) | |
1876 | goto out; | |
7e55a19c | 1877 | if (READ_ONCE(ctx->rings->cq_flags) & IORING_CQ_EVENTFD_DISABLED) |
77bc59b4 UA |
1878 | goto out; |
1879 | ||
c75312dd | 1880 | if (!ev_fd->eventfd_async || io_wq_current_is_worker()) |
77bc59b4 | 1881 | eventfd_signal(ev_fd->cq_ev_fd, 1); |
77bc59b4 UA |
1882 | out: |
1883 | rcu_read_unlock(); | |
f2842ab5 JA |
1884 | } |
1885 | ||
9aa8dfde PB |
1886 | static inline void io_cqring_wake(struct io_ring_ctx *ctx) |
1887 | { | |
1888 | /* | |
1889 | * wake_up_all() may seem excessive, but io_wake_function() and | |
1890 | * io_should_wake() handle the termination of the loop and only | |
1891 | * wake as many waiters as we need to. | |
1892 | */ | |
1893 | if (wq_has_sleeper(&ctx->cq_wait)) | |
1894 | wake_up_all(&ctx->cq_wait); | |
1895 | } | |
1896 | ||
2c5d763c JA |
1897 | /* |
1898 | * This should only get called when at least one event has been posted. | |
1899 | * Some applications rely on the eventfd notification count only changing | |
1900 | * IFF a new CQE has been added to the CQ ring. There's no depedency on | |
1901 | * 1:1 relationship between how many times this function is called (and | |
1902 | * hence the eventfd count) and number of CQEs posted to the CQ ring. | |
1903 | */ | |
66fc25ca | 1904 | static inline void io_cqring_ev_posted(struct io_ring_ctx *ctx) |
1d7bb1d5 | 1905 | { |
9aa8dfde PB |
1906 | if (unlikely(ctx->off_timeout_used || ctx->drain_active || |
1907 | ctx->has_evfd)) | |
9333f6b4 PB |
1908 | __io_commit_cqring_flush(ctx); |
1909 | ||
9aa8dfde | 1910 | io_cqring_wake(ctx); |
1d7bb1d5 JA |
1911 | } |
1912 | ||
80c18e4a PB |
1913 | static void io_cqring_ev_posted_iopoll(struct io_ring_ctx *ctx) |
1914 | { | |
9aa8dfde PB |
1915 | if (unlikely(ctx->off_timeout_used || ctx->drain_active || |
1916 | ctx->has_evfd)) | |
9333f6b4 PB |
1917 | __io_commit_cqring_flush(ctx); |
1918 | ||
9aa8dfde PB |
1919 | if (ctx->flags & IORING_SETUP_SQPOLL) |
1920 | io_cqring_wake(ctx); | |
80c18e4a PB |
1921 | } |
1922 | ||
c4a2ed72 | 1923 | /* Returns true if there are no backlogged entries after the flush */ |
6c2450ae | 1924 | static bool __io_cqring_overflow_flush(struct io_ring_ctx *ctx, bool force) |
1d7bb1d5 | 1925 | { |
b18032bb | 1926 | bool all_flushed, posted; |
1d7bb1d5 | 1927 | |
a566c556 | 1928 | if (!force && __io_cqring_events(ctx) == ctx->cq_entries) |
e23de15f | 1929 | return false; |
1d7bb1d5 | 1930 | |
b18032bb | 1931 | posted = false; |
79ebeaee | 1932 | spin_lock(&ctx->completion_lock); |
6c2450ae | 1933 | while (!list_empty(&ctx->cq_overflow_list)) { |
d068b506 | 1934 | struct io_uring_cqe *cqe = io_get_cqe(ctx); |
6c2450ae | 1935 | struct io_overflow_cqe *ocqe; |
e6c8aa9a | 1936 | |
1d7bb1d5 JA |
1937 | if (!cqe && !force) |
1938 | break; | |
6c2450ae PB |
1939 | ocqe = list_first_entry(&ctx->cq_overflow_list, |
1940 | struct io_overflow_cqe, list); | |
1941 | if (cqe) | |
1942 | memcpy(cqe, &ocqe->cqe, sizeof(*cqe)); | |
1943 | else | |
8f6ed49a PB |
1944 | io_account_cq_overflow(ctx); |
1945 | ||
b18032bb | 1946 | posted = true; |
6c2450ae PB |
1947 | list_del(&ocqe->list); |
1948 | kfree(ocqe); | |
1d7bb1d5 JA |
1949 | } |
1950 | ||
09e88404 PB |
1951 | all_flushed = list_empty(&ctx->cq_overflow_list); |
1952 | if (all_flushed) { | |
5ed7a37d | 1953 | clear_bit(0, &ctx->check_cq_overflow); |
20c0b380 NA |
1954 | WRITE_ONCE(ctx->rings->sq_flags, |
1955 | ctx->rings->sq_flags & ~IORING_SQ_CQ_OVERFLOW); | |
09e88404 | 1956 | } |
46930143 | 1957 | |
60053be8 | 1958 | io_commit_cqring(ctx); |
79ebeaee | 1959 | spin_unlock(&ctx->completion_lock); |
b18032bb JA |
1960 | if (posted) |
1961 | io_cqring_ev_posted(ctx); | |
09e88404 | 1962 | return all_flushed; |
1d7bb1d5 JA |
1963 | } |
1964 | ||
90f67366 | 1965 | static bool io_cqring_overflow_flush(struct io_ring_ctx *ctx) |
6c503150 | 1966 | { |
ca0a2651 JA |
1967 | bool ret = true; |
1968 | ||
5ed7a37d | 1969 | if (test_bit(0, &ctx->check_cq_overflow)) { |
6c503150 PB |
1970 | /* iopoll syncs against uring_lock, not completion_lock */ |
1971 | if (ctx->flags & IORING_SETUP_IOPOLL) | |
1972 | mutex_lock(&ctx->uring_lock); | |
90f67366 | 1973 | ret = __io_cqring_overflow_flush(ctx, false); |
6c503150 PB |
1974 | if (ctx->flags & IORING_SETUP_IOPOLL) |
1975 | mutex_unlock(&ctx->uring_lock); | |
1976 | } | |
ca0a2651 JA |
1977 | |
1978 | return ret; | |
6c503150 PB |
1979 | } |
1980 | ||
9d170164 | 1981 | static void __io_put_task(struct task_struct *task, int nr) |
6a290a14 PB |
1982 | { |
1983 | struct io_uring_task *tctx = task->io_uring; | |
1984 | ||
9d170164 PB |
1985 | percpu_counter_sub(&tctx->inflight, nr); |
1986 | if (unlikely(atomic_read(&tctx->in_idle))) | |
1987 | wake_up(&tctx->wait); | |
1988 | put_task_struct_many(task, nr); | |
1989 | } | |
1990 | ||
1991 | /* must to be called somewhat shortly after putting a request */ | |
1992 | static inline void io_put_task(struct task_struct *task, int nr) | |
1993 | { | |
1994 | if (likely(task == current)) | |
1995 | task->io_uring->cached_refs += nr; | |
1996 | else | |
1997 | __io_put_task(task, nr); | |
6a290a14 PB |
1998 | } |
1999 | ||
9a10867a PB |
2000 | static void io_task_refs_refill(struct io_uring_task *tctx) |
2001 | { | |
2002 | unsigned int refill = -tctx->cached_refs + IO_TCTX_REFS_CACHE_NR; | |
2003 | ||
2004 | percpu_counter_add(&tctx->inflight, refill); | |
2005 | refcount_add(refill, ¤t->usage); | |
2006 | tctx->cached_refs += refill; | |
2007 | } | |
2008 | ||
2009 | static inline void io_get_task_refs(int nr) | |
2010 | { | |
2011 | struct io_uring_task *tctx = current->io_uring; | |
2012 | ||
2013 | tctx->cached_refs -= nr; | |
2014 | if (unlikely(tctx->cached_refs < 0)) | |
2015 | io_task_refs_refill(tctx); | |
2016 | } | |
2017 | ||
3cc7fdb9 PB |
2018 | static __cold void io_uring_drop_tctx_refs(struct task_struct *task) |
2019 | { | |
2020 | struct io_uring_task *tctx = task->io_uring; | |
2021 | unsigned int refs = tctx->cached_refs; | |
2022 | ||
2023 | if (refs) { | |
2024 | tctx->cached_refs = 0; | |
2025 | percpu_counter_sub(&tctx->inflight, refs); | |
2026 | put_task_struct_many(task, refs); | |
2027 | } | |
2028 | } | |
2029 | ||
d4d19c19 | 2030 | static bool io_cqring_event_overflow(struct io_ring_ctx *ctx, u64 user_data, |
54daa9b2 | 2031 | s32 res, u32 cflags) |
2b188cc1 | 2032 | { |
cce4b8b0 | 2033 | struct io_overflow_cqe *ocqe; |
2b188cc1 | 2034 | |
cce4b8b0 PB |
2035 | ocqe = kmalloc(sizeof(*ocqe), GFP_ATOMIC | __GFP_ACCOUNT); |
2036 | if (!ocqe) { | |
2037 | /* | |
2038 | * If we're in ring overflow flush mode, or in task cancel mode, | |
2039 | * or cannot allocate an overflow entry, then we need to drop it | |
2040 | * on the floor. | |
2041 | */ | |
8f6ed49a | 2042 | io_account_cq_overflow(ctx); |
cce4b8b0 | 2043 | return false; |
2b188cc1 | 2044 | } |
cce4b8b0 | 2045 | if (list_empty(&ctx->cq_overflow_list)) { |
5ed7a37d | 2046 | set_bit(0, &ctx->check_cq_overflow); |
20c0b380 NA |
2047 | WRITE_ONCE(ctx->rings->sq_flags, |
2048 | ctx->rings->sq_flags | IORING_SQ_CQ_OVERFLOW); | |
2049 | ||
cce4b8b0 | 2050 | } |
d4d19c19 | 2051 | ocqe->cqe.user_data = user_data; |
cce4b8b0 PB |
2052 | ocqe->cqe.res = res; |
2053 | ocqe->cqe.flags = cflags; | |
2054 | list_add_tail(&ocqe->list, &ctx->cq_overflow_list); | |
2055 | return true; | |
2b188cc1 JA |
2056 | } |
2057 | ||
ae4da189 | 2058 | static inline bool __io_fill_cqe(struct io_ring_ctx *ctx, u64 user_data, |
913a571a | 2059 | s32 res, u32 cflags) |
2b188cc1 JA |
2060 | { |
2061 | struct io_uring_cqe *cqe; | |
2062 | ||
2063 | /* | |
2064 | * If we can't get a cq entry, userspace overflowed the | |
2065 | * submission (by quite a lot). Increment the overflow count in | |
2066 | * the ring. | |
2067 | */ | |
d068b506 | 2068 | cqe = io_get_cqe(ctx); |
1d7bb1d5 | 2069 | if (likely(cqe)) { |
d4d19c19 | 2070 | WRITE_ONCE(cqe->user_data, user_data); |
2b188cc1 | 2071 | WRITE_ONCE(cqe->res, res); |
bcda7baa | 2072 | WRITE_ONCE(cqe->flags, cflags); |
8d13326e | 2073 | return true; |
2b188cc1 | 2074 | } |
d4d19c19 | 2075 | return io_cqring_event_overflow(ctx, user_data, res, cflags); |
2b188cc1 JA |
2076 | } |
2077 | ||
90e7c35f PB |
2078 | static inline bool __io_fill_cqe_req_filled(struct io_ring_ctx *ctx, |
2079 | struct io_kiocb *req) | |
2080 | { | |
2081 | struct io_uring_cqe *cqe; | |
2082 | ||
2083 | trace_io_uring_complete(req->ctx, req, req->cqe.user_data, | |
2084 | req->cqe.res, req->cqe.flags); | |
2085 | ||
2086 | /* | |
2087 | * If we can't get a cq entry, userspace overflowed the | |
2088 | * submission (by quite a lot). Increment the overflow count in | |
2089 | * the ring. | |
2090 | */ | |
2091 | cqe = io_get_cqe(ctx); | |
2092 | if (likely(cqe)) { | |
2093 | memcpy(cqe, &req->cqe, sizeof(*cqe)); | |
2094 | return true; | |
2095 | } | |
2096 | return io_cqring_event_overflow(ctx, req->cqe.user_data, | |
2097 | req->cqe.res, req->cqe.flags); | |
2098 | } | |
2099 | ||
ae4da189 | 2100 | static inline bool __io_fill_cqe_req(struct io_kiocb *req, s32 res, u32 cflags) |
d5ec1dfa | 2101 | { |
cef216fc PB |
2102 | trace_io_uring_complete(req->ctx, req, req->cqe.user_data, res, cflags); |
2103 | return __io_fill_cqe(req->ctx, req->cqe.user_data, res, cflags); | |
d5ec1dfa SR |
2104 | } |
2105 | ||
913a571a | 2106 | static noinline void io_fill_cqe_req(struct io_kiocb *req, s32 res, u32 cflags) |
bcda7baa | 2107 | { |
04c76b41 | 2108 | if (!(req->flags & REQ_F_CQE_SKIP)) |
ae4da189 | 2109 | __io_fill_cqe_req(req, res, cflags); |
bcda7baa JA |
2110 | } |
2111 | ||
913a571a PB |
2112 | static noinline bool io_fill_cqe_aux(struct io_ring_ctx *ctx, u64 user_data, |
2113 | s32 res, u32 cflags) | |
bcda7baa | 2114 | { |
913a571a | 2115 | ctx->cq_extra++; |
502c87d6 | 2116 | trace_io_uring_complete(ctx, NULL, user_data, res, cflags); |
ae4da189 | 2117 | return __io_fill_cqe(ctx, user_data, res, cflags); |
bcda7baa JA |
2118 | } |
2119 | ||
a37fae8a HX |
2120 | static void __io_req_complete_post(struct io_kiocb *req, s32 res, |
2121 | u32 cflags) | |
2b188cc1 | 2122 | { |
78e19bbe | 2123 | struct io_ring_ctx *ctx = req->ctx; |
2b188cc1 | 2124 | |
04c76b41 | 2125 | if (!(req->flags & REQ_F_CQE_SKIP)) |
ae4da189 | 2126 | __io_fill_cqe_req(req, res, cflags); |
c7dae4ba JA |
2127 | /* |
2128 | * If we're the last reference to this request, add to our locked | |
2129 | * free_list cache. | |
2130 | */ | |
de9b4cca | 2131 | if (req_ref_put_and_test(req)) { |
7a612350 | 2132 | if (req->flags & (REQ_F_LINK | REQ_F_HARDLINK)) { |
0756a869 | 2133 | if (req->flags & IO_DISARM_MASK) |
7a612350 PB |
2134 | io_disarm_next(req); |
2135 | if (req->link) { | |
2136 | io_req_task_queue(req->link); | |
2137 | req->link = NULL; | |
2138 | } | |
2139 | } | |
ab409402 | 2140 | io_req_put_rsrc(req, ctx); |
8197b053 PB |
2141 | /* |
2142 | * Selected buffer deallocation in io_clean_op() assumes that | |
2143 | * we don't hold ->completion_lock. Clean them here to avoid | |
2144 | * deadlocks. | |
2145 | */ | |
2146 | io_put_kbuf_comp(req); | |
c7dae4ba JA |
2147 | io_dismantle_req(req); |
2148 | io_put_task(req->task, 1); | |
c2b6c6bc | 2149 | wq_list_add_head(&req->comp_list, &ctx->locked_free_list); |
d0acdee2 | 2150 | ctx->locked_free_nr++; |
180f829f | 2151 | } |
a37fae8a HX |
2152 | } |
2153 | ||
2154 | static void io_req_complete_post(struct io_kiocb *req, s32 res, | |
2155 | u32 cflags) | |
2156 | { | |
2157 | struct io_ring_ctx *ctx = req->ctx; | |
2158 | ||
2159 | spin_lock(&ctx->completion_lock); | |
2160 | __io_req_complete_post(req, res, cflags); | |
7a612350 | 2161 | io_commit_cqring(ctx); |
79ebeaee | 2162 | spin_unlock(&ctx->completion_lock); |
a3f34907 | 2163 | io_cqring_ev_posted(ctx); |
4e3d9ff9 JA |
2164 | } |
2165 | ||
54daa9b2 PB |
2166 | static inline void io_req_complete_state(struct io_kiocb *req, s32 res, |
2167 | u32 cflags) | |
229a7b63 | 2168 | { |
cef216fc PB |
2169 | req->cqe.res = res; |
2170 | req->cqe.flags = cflags; | |
e342c807 | 2171 | req->flags |= REQ_F_COMPLETE_INLINE; |
e1e16097 JA |
2172 | } |
2173 | ||
889fca73 | 2174 | static inline void __io_req_complete(struct io_kiocb *req, unsigned issue_flags, |
54daa9b2 | 2175 | s32 res, u32 cflags) |
bcda7baa | 2176 | { |
889fca73 PB |
2177 | if (issue_flags & IO_URING_F_COMPLETE_DEFER) |
2178 | io_req_complete_state(req, res, cflags); | |
a38d68db | 2179 | else |
c7dae4ba | 2180 | io_req_complete_post(req, res, cflags); |
bcda7baa JA |
2181 | } |
2182 | ||
54daa9b2 | 2183 | static inline void io_req_complete(struct io_kiocb *req, s32 res) |
0ddf92e8 | 2184 | { |
889fca73 | 2185 | __io_req_complete(req, 0, res, 0); |
0ddf92e8 JA |
2186 | } |
2187 | ||
54daa9b2 | 2188 | static void io_req_complete_failed(struct io_kiocb *req, s32 res) |
f41db273 | 2189 | { |
93d2bcd2 | 2190 | req_set_fail(req); |
ab0ac095 | 2191 | io_req_complete_post(req, res, io_put_kbuf(req, IO_URING_F_UNLOCKED)); |
f41db273 PB |
2192 | } |
2193 | ||
c6d3d9cb PB |
2194 | static void io_req_complete_fail_submit(struct io_kiocb *req) |
2195 | { | |
2196 | /* | |
2197 | * We don't submit, fail them all, for that replace hardlinks with | |
2198 | * normal links. Extra REQ_F_LINK is tolerated. | |
2199 | */ | |
2200 | req->flags &= ~REQ_F_HARDLINK; | |
2201 | req->flags |= REQ_F_LINK; | |
cef216fc | 2202 | io_req_complete_failed(req, req->cqe.res); |
c6d3d9cb PB |
2203 | } |
2204 | ||
864ea921 PB |
2205 | /* |
2206 | * Don't initialise the fields below on every allocation, but do that in | |
2207 | * advance and keep them valid across allocations. | |
2208 | */ | |
2209 | static void io_preinit_req(struct io_kiocb *req, struct io_ring_ctx *ctx) | |
2210 | { | |
2211 | req->ctx = ctx; | |
2212 | req->link = NULL; | |
2213 | req->async_data = NULL; | |
2214 | /* not necessary, but safer to zero */ | |
cef216fc | 2215 | req->cqe.res = 0; |
864ea921 PB |
2216 | } |
2217 | ||
dac7a098 | 2218 | static void io_flush_cached_locked_reqs(struct io_ring_ctx *ctx, |
cd0ca2e0 | 2219 | struct io_submit_state *state) |
dac7a098 | 2220 | { |
79ebeaee | 2221 | spin_lock(&ctx->completion_lock); |
c2b6c6bc | 2222 | wq_list_splice(&ctx->locked_free_list, &state->free_list); |
d0acdee2 | 2223 | ctx->locked_free_nr = 0; |
79ebeaee | 2224 | spin_unlock(&ctx->completion_lock); |
dac7a098 PB |
2225 | } |
2226 | ||
dd78f492 | 2227 | /* Returns true IFF there are requests in the cache */ |
c7dae4ba | 2228 | static bool io_flush_cached_reqs(struct io_ring_ctx *ctx) |
0ddf92e8 | 2229 | { |
c7dae4ba | 2230 | struct io_submit_state *state = &ctx->submit_state; |
0ddf92e8 | 2231 | |
c7dae4ba JA |
2232 | /* |
2233 | * If we have more than a batch's worth of requests in our IRQ side | |
2234 | * locked cache, grab the lock and move them over to our submission | |
2235 | * side cache. | |
2236 | */ | |
d0acdee2 | 2237 | if (READ_ONCE(ctx->locked_free_nr) > IO_COMPL_BATCH) |
cd0ca2e0 | 2238 | io_flush_cached_locked_reqs(ctx, state); |
c2b6c6bc | 2239 | return !!state->free_list.next; |
0ddf92e8 JA |
2240 | } |
2241 | ||
5d5901a3 PB |
2242 | /* |
2243 | * A request might get retired back into the request caches even before opcode | |
2244 | * handlers and io_issue_sqe() are done with it, e.g. inline completion path. | |
2245 | * Because of that, io_alloc_req() should be called only under ->uring_lock | |
2246 | * and with extra caution to not get a request that is still worked on. | |
2247 | */ | |
c072481d | 2248 | static __cold bool __io_alloc_req_refill(struct io_ring_ctx *ctx) |
5d5901a3 | 2249 | __must_hold(&ctx->uring_lock) |
2b188cc1 | 2250 | { |
e5d1bc0a | 2251 | struct io_submit_state *state = &ctx->submit_state; |
864ea921 | 2252 | gfp_t gfp = GFP_KERNEL | __GFP_NOWARN; |
3ab665b7 PB |
2253 | void *reqs[IO_REQ_ALLOC_BATCH]; |
2254 | struct io_kiocb *req; | |
864ea921 | 2255 | int ret, i; |
e5d1bc0a | 2256 | |
c2b6c6bc | 2257 | if (likely(state->free_list.next || io_flush_cached_reqs(ctx))) |
a33ae9ce | 2258 | return true; |
e5d1bc0a | 2259 | |
3ab665b7 | 2260 | ret = kmem_cache_alloc_bulk(req_cachep, gfp, ARRAY_SIZE(reqs), reqs); |
fd6fab2c | 2261 | |
864ea921 PB |
2262 | /* |
2263 | * Bulk alloc is all-or-nothing. If we fail to get a batch, | |
2264 | * retry single alloc to be on the safe side. | |
2265 | */ | |
2266 | if (unlikely(ret <= 0)) { | |
3ab665b7 PB |
2267 | reqs[0] = kmem_cache_alloc(req_cachep, gfp); |
2268 | if (!reqs[0]) | |
a33ae9ce | 2269 | return false; |
864ea921 | 2270 | ret = 1; |
2b188cc1 | 2271 | } |
864ea921 | 2272 | |
37f0e767 | 2273 | percpu_ref_get_many(&ctx->refs, ret); |
3ab665b7 PB |
2274 | for (i = 0; i < ret; i++) { |
2275 | req = reqs[i]; | |
2276 | ||
2277 | io_preinit_req(req, ctx); | |
c2b6c6bc | 2278 | wq_stack_add_head(&req->comp_list, &state->free_list); |
3ab665b7 | 2279 | } |
a33ae9ce PB |
2280 | return true; |
2281 | } | |
2282 | ||
2283 | static inline bool io_alloc_req_refill(struct io_ring_ctx *ctx) | |
2284 | { | |
2285 | if (unlikely(!ctx->submit_state.free_list.next)) | |
2286 | return __io_alloc_req_refill(ctx); | |
2287 | return true; | |
2288 | } | |
2289 | ||
2290 | static inline struct io_kiocb *io_alloc_req(struct io_ring_ctx *ctx) | |
2291 | { | |
2292 | struct io_wq_work_node *node; | |
2293 | ||
2294 | node = wq_stack_extract(&ctx->submit_state.free_list); | |
c2b6c6bc | 2295 | return container_of(node, struct io_kiocb, comp_list); |
2b188cc1 JA |
2296 | } |
2297 | ||
e1d767f0 | 2298 | static inline void io_put_file(struct file *file) |
8da11c19 | 2299 | { |
e1d767f0 | 2300 | if (file) |
8da11c19 PB |
2301 | fput(file); |
2302 | } | |
2303 | ||
6b639522 | 2304 | static inline void io_dismantle_req(struct io_kiocb *req) |
2b188cc1 | 2305 | { |
094bae49 | 2306 | unsigned int flags = req->flags; |
929a3af9 | 2307 | |
867f8fa5 | 2308 | if (unlikely(flags & IO_REQ_CLEAN_FLAGS)) |
3a0a6902 | 2309 | io_clean_op(req); |
e1d767f0 PB |
2310 | if (!(flags & REQ_F_FIXED_FILE)) |
2311 | io_put_file(req->file); | |
e65ef56d JA |
2312 | } |
2313 | ||
c072481d | 2314 | static __cold void __io_free_req(struct io_kiocb *req) |
c6ca97b3 | 2315 | { |
51a4cc11 | 2316 | struct io_ring_ctx *ctx = req->ctx; |
c6ca97b3 | 2317 | |
ab409402 | 2318 | io_req_put_rsrc(req, ctx); |
216578e5 | 2319 | io_dismantle_req(req); |
7c660731 | 2320 | io_put_task(req->task, 1); |
c6ca97b3 | 2321 | |
79ebeaee | 2322 | spin_lock(&ctx->completion_lock); |
c2b6c6bc | 2323 | wq_list_add_head(&req->comp_list, &ctx->locked_free_list); |
c34b025f | 2324 | ctx->locked_free_nr++; |
79ebeaee | 2325 | spin_unlock(&ctx->completion_lock); |
e65ef56d JA |
2326 | } |
2327 | ||
f2f87370 PB |
2328 | static inline void io_remove_next_linked(struct io_kiocb *req) |
2329 | { | |
2330 | struct io_kiocb *nxt = req->link; | |
2331 | ||
2332 | req->link = nxt->link; | |
2333 | nxt->link = NULL; | |
2334 | } | |
2335 | ||
33cc89a9 PB |
2336 | static bool io_kill_linked_timeout(struct io_kiocb *req) |
2337 | __must_hold(&req->ctx->completion_lock) | |
89b263f6 | 2338 | __must_hold(&req->ctx->timeout_lock) |
2665abfd | 2339 | { |
33cc89a9 | 2340 | struct io_kiocb *link = req->link; |
f2f87370 | 2341 | |
b97e736a | 2342 | if (link && link->opcode == IORING_OP_LINK_TIMEOUT) { |
c9abd7ad | 2343 | struct io_timeout_data *io = link->async_data; |
7c86ffee | 2344 | |
f2f87370 | 2345 | io_remove_next_linked(req); |
90cd7e42 | 2346 | link->timeout.head = NULL; |
fd9c7bc5 | 2347 | if (hrtimer_try_to_cancel(&io->timer) != -1) { |
ef9dd637 | 2348 | list_del(&link->timeout.list); |
04c76b41 | 2349 | /* leave REQ_F_CQE_SKIP to io_fill_cqe_req */ |
913a571a | 2350 | io_fill_cqe_req(link, -ECANCELED, 0); |
91c2f697 | 2351 | io_put_req_deferred(link); |
d4729fbd | 2352 | return true; |
c9abd7ad PB |
2353 | } |
2354 | } | |
d4729fbd | 2355 | return false; |
7c86ffee PB |
2356 | } |
2357 | ||
d148ca4b | 2358 | static void io_fail_links(struct io_kiocb *req) |
33cc89a9 | 2359 | __must_hold(&req->ctx->completion_lock) |
9e645e11 | 2360 | { |
33cc89a9 | 2361 | struct io_kiocb *nxt, *link = req->link; |
04c76b41 | 2362 | bool ignore_cqes = req->flags & REQ_F_SKIP_LINK_CQES; |
9e645e11 | 2363 | |
f2f87370 | 2364 | req->link = NULL; |
f2f87370 | 2365 | while (link) { |
a8295b98 HX |
2366 | long res = -ECANCELED; |
2367 | ||
2368 | if (link->flags & REQ_F_FAIL) | |
cef216fc | 2369 | res = link->cqe.res; |
a8295b98 | 2370 | |
f2f87370 PB |
2371 | nxt = link->link; |
2372 | link->link = NULL; | |
2665abfd | 2373 | |
cef216fc | 2374 | trace_io_uring_fail_link(req->ctx, req, req->cqe.user_data, |
502c87d6 SR |
2375 | req->opcode, link); |
2376 | ||
04c76b41 PB |
2377 | if (!ignore_cqes) { |
2378 | link->flags &= ~REQ_F_CQE_SKIP; | |
2379 | io_fill_cqe_req(link, res, 0); | |
2380 | } | |
91c2f697 | 2381 | io_put_req_deferred(link); |
f2f87370 | 2382 | link = nxt; |
9e645e11 | 2383 | } |
33cc89a9 | 2384 | } |
9e645e11 | 2385 | |
33cc89a9 PB |
2386 | static bool io_disarm_next(struct io_kiocb *req) |
2387 | __must_hold(&req->ctx->completion_lock) | |
2388 | { | |
2389 | bool posted = false; | |
2390 | ||
0756a869 PB |
2391 | if (req->flags & REQ_F_ARM_LTIMEOUT) { |
2392 | struct io_kiocb *link = req->link; | |
2393 | ||
906c6caa | 2394 | req->flags &= ~REQ_F_ARM_LTIMEOUT; |
0756a869 PB |
2395 | if (link && link->opcode == IORING_OP_LINK_TIMEOUT) { |
2396 | io_remove_next_linked(req); | |
04c76b41 | 2397 | /* leave REQ_F_CQE_SKIP to io_fill_cqe_req */ |
913a571a | 2398 | io_fill_cqe_req(link, -ECANCELED, 0); |
0756a869 PB |
2399 | io_put_req_deferred(link); |
2400 | posted = true; | |
2401 | } | |
2402 | } else if (req->flags & REQ_F_LINK_TIMEOUT) { | |
89b263f6 JA |
2403 | struct io_ring_ctx *ctx = req->ctx; |
2404 | ||
2405 | spin_lock_irq(&ctx->timeout_lock); | |
33cc89a9 | 2406 | posted = io_kill_linked_timeout(req); |
89b263f6 JA |
2407 | spin_unlock_irq(&ctx->timeout_lock); |
2408 | } | |
93d2bcd2 | 2409 | if (unlikely((req->flags & REQ_F_FAIL) && |
e4335ed3 | 2410 | !(req->flags & REQ_F_HARDLINK))) { |
33cc89a9 PB |
2411 | posted |= (req->link != NULL); |
2412 | io_fail_links(req); | |
2413 | } | |
2414 | return posted; | |
9e645e11 JA |
2415 | } |
2416 | ||
d81499bf PB |
2417 | static void __io_req_find_next_prep(struct io_kiocb *req) |
2418 | { | |
2419 | struct io_ring_ctx *ctx = req->ctx; | |
2420 | bool posted; | |
2421 | ||
2422 | spin_lock(&ctx->completion_lock); | |
2423 | posted = io_disarm_next(req); | |
60053be8 | 2424 | io_commit_cqring(ctx); |
d81499bf PB |
2425 | spin_unlock(&ctx->completion_lock); |
2426 | if (posted) | |
2427 | io_cqring_ev_posted(ctx); | |
2428 | } | |
2429 | ||
2430 | static inline struct io_kiocb *io_req_find_next(struct io_kiocb *req) | |
c69f8dbe | 2431 | { |
33cc89a9 | 2432 | struct io_kiocb *nxt; |
944e58bf | 2433 | |
9e645e11 JA |
2434 | /* |
2435 | * If LINK is set, we have dependent requests in this chain. If we | |
2436 | * didn't fail this request, queue the first one up, moving any other | |
2437 | * dependencies to the next request. In case of failure, fail the rest | |
2438 | * of the chain. | |
2439 | */ | |
d81499bf PB |
2440 | if (unlikely(req->flags & IO_DISARM_MASK)) |
2441 | __io_req_find_next_prep(req); | |
33cc89a9 PB |
2442 | nxt = req->link; |
2443 | req->link = NULL; | |
2444 | return nxt; | |
4d7dd462 | 2445 | } |
9e645e11 | 2446 | |
f237c30a | 2447 | static void ctx_flush_and_put(struct io_ring_ctx *ctx, bool *locked) |
2c32395d PB |
2448 | { |
2449 | if (!ctx) | |
2450 | return; | |
f237c30a | 2451 | if (*locked) { |
c450178d | 2452 | io_submit_flush_completions(ctx); |
2c32395d | 2453 | mutex_unlock(&ctx->uring_lock); |
f237c30a | 2454 | *locked = false; |
2c32395d PB |
2455 | } |
2456 | percpu_ref_put(&ctx->refs); | |
2457 | } | |
2458 | ||
f28c240e HX |
2459 | static inline void ctx_commit_and_unlock(struct io_ring_ctx *ctx) |
2460 | { | |
2461 | io_commit_cqring(ctx); | |
2462 | spin_unlock(&ctx->completion_lock); | |
2463 | io_cqring_ev_posted(ctx); | |
2464 | } | |
2465 | ||
2466 | static void handle_prev_tw_list(struct io_wq_work_node *node, | |
2467 | struct io_ring_ctx **ctx, bool *uring_locked) | |
2468 | { | |
2469 | if (*ctx && !*uring_locked) | |
2470 | spin_lock(&(*ctx)->completion_lock); | |
2471 | ||
2472 | do { | |
2473 | struct io_wq_work_node *next = node->next; | |
2474 | struct io_kiocb *req = container_of(node, struct io_kiocb, | |
2475 | io_task_work.node); | |
2476 | ||
34d2bfe7 JA |
2477 | prefetch(container_of(next, struct io_kiocb, io_task_work.node)); |
2478 | ||
f28c240e HX |
2479 | if (req->ctx != *ctx) { |
2480 | if (unlikely(!*uring_locked && *ctx)) | |
2481 | ctx_commit_and_unlock(*ctx); | |
2482 | ||
2483 | ctx_flush_and_put(*ctx, uring_locked); | |
2484 | *ctx = req->ctx; | |
2485 | /* if not contended, grab and improve batching */ | |
2486 | *uring_locked = mutex_trylock(&(*ctx)->uring_lock); | |
2487 | percpu_ref_get(&(*ctx)->refs); | |
2488 | if (unlikely(!*uring_locked)) | |
2489 | spin_lock(&(*ctx)->completion_lock); | |
2490 | } | |
2491 | if (likely(*uring_locked)) | |
2492 | req->io_task_work.func(req, uring_locked); | |
2493 | else | |
cef216fc | 2494 | __io_req_complete_post(req, req->cqe.res, |
cc3cec83 | 2495 | io_put_kbuf_comp(req)); |
f28c240e HX |
2496 | node = next; |
2497 | } while (node); | |
2498 | ||
2499 | if (unlikely(!*uring_locked)) | |
2500 | ctx_commit_and_unlock(*ctx); | |
2501 | } | |
2502 | ||
2503 | static void handle_tw_list(struct io_wq_work_node *node, | |
2504 | struct io_ring_ctx **ctx, bool *locked) | |
9f8d032a HX |
2505 | { |
2506 | do { | |
2507 | struct io_wq_work_node *next = node->next; | |
2508 | struct io_kiocb *req = container_of(node, struct io_kiocb, | |
2509 | io_task_work.node); | |
2510 | ||
34d2bfe7 JA |
2511 | prefetch(container_of(next, struct io_kiocb, io_task_work.node)); |
2512 | ||
9f8d032a HX |
2513 | if (req->ctx != *ctx) { |
2514 | ctx_flush_and_put(*ctx, locked); | |
2515 | *ctx = req->ctx; | |
2516 | /* if not contended, grab and improve batching */ | |
2517 | *locked = mutex_trylock(&(*ctx)->uring_lock); | |
2518 | percpu_ref_get(&(*ctx)->refs); | |
2519 | } | |
2520 | req->io_task_work.func(req, locked); | |
2521 | node = next; | |
2522 | } while (node); | |
2523 | } | |
2524 | ||
7cbf1722 | 2525 | static void tctx_task_work(struct callback_head *cb) |
c40f6379 | 2526 | { |
f28c240e | 2527 | bool uring_locked = false; |
ebd0df2e | 2528 | struct io_ring_ctx *ctx = NULL; |
3f18407d PB |
2529 | struct io_uring_task *tctx = container_of(cb, struct io_uring_task, |
2530 | task_work); | |
c40f6379 | 2531 | |
16f72070 | 2532 | while (1) { |
f28c240e | 2533 | struct io_wq_work_node *node1, *node2; |
3f18407d PB |
2534 | |
2535 | spin_lock_irq(&tctx->task_lock); | |
f28c240e HX |
2536 | node1 = tctx->prior_task_list.first; |
2537 | node2 = tctx->task_list.first; | |
3f18407d | 2538 | INIT_WQ_LIST(&tctx->task_list); |
f28c240e HX |
2539 | INIT_WQ_LIST(&tctx->prior_task_list); |
2540 | if (!node2 && !node1) | |
6294f368 | 2541 | tctx->task_running = false; |
3f18407d | 2542 | spin_unlock_irq(&tctx->task_lock); |
f28c240e | 2543 | if (!node2 && !node1) |
6294f368 | 2544 | break; |
3f18407d | 2545 | |
f28c240e HX |
2546 | if (node1) |
2547 | handle_prev_tw_list(node1, &ctx, &uring_locked); | |
f28c240e HX |
2548 | if (node2) |
2549 | handle_tw_list(node2, &ctx, &uring_locked); | |
7cbf1722 | 2550 | cond_resched(); |
68ca8fc0 PB |
2551 | |
2552 | if (!tctx->task_list.first && | |
2553 | !tctx->prior_task_list.first && uring_locked) | |
2554 | io_submit_flush_completions(ctx); | |
3f18407d | 2555 | } |
ebd0df2e | 2556 | |
f28c240e | 2557 | ctx_flush_and_put(ctx, &uring_locked); |
3cc7fdb9 PB |
2558 | |
2559 | /* relaxed read is enough as only the task itself sets ->in_idle */ | |
2560 | if (unlikely(atomic_read(&tctx->in_idle))) | |
2561 | io_uring_drop_tctx_refs(current); | |
7cbf1722 JA |
2562 | } |
2563 | ||
4813c377 | 2564 | static void io_req_task_work_add(struct io_kiocb *req, bool priority) |
7cbf1722 | 2565 | { |
c15b79de | 2566 | struct task_struct *tsk = req->task; |
7cbf1722 | 2567 | struct io_uring_task *tctx = tsk->io_uring; |
c15b79de | 2568 | enum task_work_notify_mode notify; |
e09ee510 | 2569 | struct io_wq_work_node *node; |
0b81e80c | 2570 | unsigned long flags; |
6294f368 | 2571 | bool running; |
7cbf1722 JA |
2572 | |
2573 | WARN_ON_ONCE(!tctx); | |
2574 | ||
d5361233 JA |
2575 | io_drop_inflight_file(req); |
2576 | ||
0b81e80c | 2577 | spin_lock_irqsave(&tctx->task_lock, flags); |
4813c377 HX |
2578 | if (priority) |
2579 | wq_list_add_tail(&req->io_task_work.node, &tctx->prior_task_list); | |
2580 | else | |
2581 | wq_list_add_tail(&req->io_task_work.node, &tctx->task_list); | |
6294f368 PB |
2582 | running = tctx->task_running; |
2583 | if (!running) | |
2584 | tctx->task_running = true; | |
0b81e80c | 2585 | spin_unlock_irqrestore(&tctx->task_lock, flags); |
7cbf1722 JA |
2586 | |
2587 | /* task_work already pending, we're done */ | |
6294f368 | 2588 | if (running) |
e09ee510 | 2589 | return; |
7cbf1722 | 2590 | |
c15b79de PB |
2591 | /* |
2592 | * SQPOLL kernel thread doesn't need notification, just a wakeup. For | |
2593 | * all other cases, use TWA_SIGNAL unconditionally to ensure we're | |
2594 | * processing task_work. There's no reliable way to tell if TWA_RESUME | |
2595 | * will do the job. | |
2596 | */ | |
2597 | notify = (req->ctx->flags & IORING_SETUP_SQPOLL) ? TWA_NONE : TWA_SIGNAL; | |
d97ec623 PB |
2598 | if (likely(!task_work_add(tsk, &tctx->task_work, notify))) { |
2599 | if (notify == TWA_NONE) | |
2600 | wake_up_process(tsk); | |
e09ee510 | 2601 | return; |
c15b79de | 2602 | } |
2215bed9 | 2603 | |
0b81e80c | 2604 | spin_lock_irqsave(&tctx->task_lock, flags); |
6294f368 | 2605 | tctx->task_running = false; |
4813c377 | 2606 | node = wq_list_merge(&tctx->prior_task_list, &tctx->task_list); |
0b81e80c | 2607 | spin_unlock_irqrestore(&tctx->task_lock, flags); |
7cbf1722 | 2608 | |
e09ee510 PB |
2609 | while (node) { |
2610 | req = container_of(node, struct io_kiocb, io_task_work.node); | |
2611 | node = node->next; | |
2612 | if (llist_add(&req->io_task_work.fallback_node, | |
2613 | &req->ctx->fallback_llist)) | |
2614 | schedule_delayed_work(&req->ctx->fallback_work, 1); | |
2615 | } | |
eab30c4d PB |
2616 | } |
2617 | ||
f237c30a | 2618 | static void io_req_task_cancel(struct io_kiocb *req, bool *locked) |
c40f6379 | 2619 | { |
87ceb6a6 | 2620 | struct io_ring_ctx *ctx = req->ctx; |
c40f6379 | 2621 | |
b18a1a45 | 2622 | /* not needed for normal modes, but SQPOLL depends on it */ |
f237c30a | 2623 | io_tw_lock(ctx, locked); |
cef216fc | 2624 | io_req_complete_failed(req, req->cqe.res); |
c40f6379 JA |
2625 | } |
2626 | ||
f237c30a | 2627 | static void io_req_task_submit(struct io_kiocb *req, bool *locked) |
c40f6379 JA |
2628 | { |
2629 | struct io_ring_ctx *ctx = req->ctx; | |
2630 | ||
f237c30a | 2631 | io_tw_lock(ctx, locked); |
316319e8 | 2632 | /* req->task == current here, checking PF_EXITING is safe */ |
af066f31 | 2633 | if (likely(!(req->task->flags & PF_EXITING))) |
c5eef2b9 | 2634 | __io_queue_sqe(req); |
81b6d05c | 2635 | else |
2593553a | 2636 | io_req_complete_failed(req, -EFAULT); |
c40f6379 JA |
2637 | } |
2638 | ||
2c4b8eb6 | 2639 | static void io_req_task_queue_fail(struct io_kiocb *req, int ret) |
c40f6379 | 2640 | { |
cef216fc | 2641 | req->cqe.res = ret; |
5b0a6acc | 2642 | req->io_task_work.func = io_req_task_cancel; |
4813c377 | 2643 | io_req_task_work_add(req, false); |
c40f6379 JA |
2644 | } |
2645 | ||
2c4b8eb6 | 2646 | static void io_req_task_queue(struct io_kiocb *req) |
a3df7698 | 2647 | { |
5b0a6acc | 2648 | req->io_task_work.func = io_req_task_submit; |
4813c377 | 2649 | io_req_task_work_add(req, false); |
a3df7698 PB |
2650 | } |
2651 | ||
773af691 JA |
2652 | static void io_req_task_queue_reissue(struct io_kiocb *req) |
2653 | { | |
2654 | req->io_task_work.func = io_queue_async_work; | |
4813c377 | 2655 | io_req_task_work_add(req, false); |
773af691 JA |
2656 | } |
2657 | ||
57859f4d | 2658 | static void io_queue_next(struct io_kiocb *req) |
c69f8dbe | 2659 | { |
57859f4d | 2660 | struct io_kiocb *nxt = io_req_find_next(req); |
944e58bf | 2661 | |
57859f4d PB |
2662 | if (nxt) |
2663 | io_req_task_queue(nxt); | |
c69f8dbe JL |
2664 | } |
2665 | ||
c3524383 | 2666 | static void io_free_req(struct io_kiocb *req) |
7a743e22 | 2667 | { |
c3524383 PB |
2668 | io_queue_next(req); |
2669 | __io_free_req(req); | |
2670 | } | |
8766dd51 | 2671 | |
f237c30a PB |
2672 | static void io_free_req_work(struct io_kiocb *req, bool *locked) |
2673 | { | |
2674 | io_free_req(req); | |
2675 | } | |
2676 | ||
3aa83bfb | 2677 | static void io_free_batch_list(struct io_ring_ctx *ctx, |
1cce17ac | 2678 | struct io_wq_work_node *node) |
3aa83bfb | 2679 | __must_hold(&ctx->uring_lock) |
5af1d13e | 2680 | { |
d4b7a5ef | 2681 | struct task_struct *task = NULL; |
37f0e767 | 2682 | int task_refs = 0; |
5af1d13e | 2683 | |
3aa83bfb PB |
2684 | do { |
2685 | struct io_kiocb *req = container_of(node, struct io_kiocb, | |
2686 | comp_list); | |
2d6500d4 | 2687 | |
a538be5b PB |
2688 | if (unlikely(req->flags & IO_REQ_CLEAN_SLOW_FLAGS)) { |
2689 | if (req->flags & REQ_F_REFCOUNT) { | |
2690 | node = req->comp_list.next; | |
2691 | if (!req_ref_put_and_test(req)) | |
2692 | continue; | |
2693 | } | |
b605a7fa PB |
2694 | if ((req->flags & REQ_F_POLLED) && req->apoll) { |
2695 | struct async_poll *apoll = req->apoll; | |
2696 | ||
2697 | if (apoll->double_poll) | |
2698 | kfree(apoll->double_poll); | |
2699 | list_add(&apoll->poll.wait.entry, | |
2700 | &ctx->apoll_cache); | |
2701 | req->flags &= ~REQ_F_POLLED; | |
2702 | } | |
57859f4d PB |
2703 | if (req->flags & (REQ_F_LINK|REQ_F_HARDLINK)) |
2704 | io_queue_next(req); | |
a538be5b PB |
2705 | if (unlikely(req->flags & IO_REQ_CLEAN_FLAGS)) |
2706 | io_clean_op(req); | |
c1e53a69 | 2707 | } |
a538be5b PB |
2708 | if (!(req->flags & REQ_F_FIXED_FILE)) |
2709 | io_put_file(req->file); | |
2d6500d4 | 2710 | |
ab409402 | 2711 | io_req_put_rsrc_locked(req, ctx); |
5af1d13e | 2712 | |
d4b7a5ef PB |
2713 | if (req->task != task) { |
2714 | if (task) | |
2715 | io_put_task(task, task_refs); | |
2716 | task = req->task; | |
2717 | task_refs = 0; | |
2718 | } | |
2719 | task_refs++; | |
c1e53a69 | 2720 | node = req->comp_list.next; |
d4b7a5ef | 2721 | wq_stack_add_head(&req->comp_list, &ctx->submit_state.free_list); |
3aa83bfb | 2722 | } while (node); |
d4b7a5ef | 2723 | |
d4b7a5ef PB |
2724 | if (task) |
2725 | io_put_task(task, task_refs); | |
7a743e22 PB |
2726 | } |
2727 | ||
c450178d | 2728 | static void __io_submit_flush_completions(struct io_ring_ctx *ctx) |
a141dd89 | 2729 | __must_hold(&ctx->uring_lock) |
905c172f | 2730 | { |
6f33b0bc | 2731 | struct io_wq_work_node *node, *prev; |
cd0ca2e0 | 2732 | struct io_submit_state *state = &ctx->submit_state; |
905c172f | 2733 | |
3d4aeb9f PB |
2734 | if (state->flush_cqes) { |
2735 | spin_lock(&ctx->completion_lock); | |
2736 | wq_list_for_each(node, prev, &state->compl_reqs) { | |
2737 | struct io_kiocb *req = container_of(node, struct io_kiocb, | |
6f33b0bc | 2738 | comp_list); |
5182ed2e | 2739 | |
3d4aeb9f | 2740 | if (!(req->flags & REQ_F_CQE_SKIP)) |
90e7c35f | 2741 | __io_fill_cqe_req_filled(ctx, req); |
3d4aeb9f PB |
2742 | } |
2743 | ||
2744 | io_commit_cqring(ctx); | |
2745 | spin_unlock(&ctx->completion_lock); | |
2746 | io_cqring_ev_posted(ctx); | |
2747 | state->flush_cqes = false; | |
905c172f | 2748 | } |
5182ed2e | 2749 | |
1cce17ac | 2750 | io_free_batch_list(ctx, state->compl_reqs.first); |
6f33b0bc | 2751 | INIT_WQ_LIST(&state->compl_reqs); |
7a743e22 PB |
2752 | } |
2753 | ||
ba816ad6 JA |
2754 | /* |
2755 | * Drop reference to request, return next in chain (if there is one) if this | |
2756 | * was the last reference to this request. | |
2757 | */ | |
0d85035a | 2758 | static inline struct io_kiocb *io_put_req_find_next(struct io_kiocb *req) |
e65ef56d | 2759 | { |
9b5f7bd9 PB |
2760 | struct io_kiocb *nxt = NULL; |
2761 | ||
de9b4cca | 2762 | if (req_ref_put_and_test(req)) { |
7819a1f6 PB |
2763 | if (unlikely(req->flags & (REQ_F_LINK|REQ_F_HARDLINK))) |
2764 | nxt = io_req_find_next(req); | |
4d7dd462 | 2765 | __io_free_req(req); |
2a44f467 | 2766 | } |
9b5f7bd9 | 2767 | return nxt; |
2b188cc1 JA |
2768 | } |
2769 | ||
0d85035a | 2770 | static inline void io_put_req(struct io_kiocb *req) |
e65ef56d | 2771 | { |
de9b4cca | 2772 | if (req_ref_put_and_test(req)) |
e65ef56d | 2773 | io_free_req(req); |
2b188cc1 JA |
2774 | } |
2775 | ||
91c2f697 | 2776 | static inline void io_put_req_deferred(struct io_kiocb *req) |
216578e5 | 2777 | { |
91c2f697 | 2778 | if (req_ref_put_and_test(req)) { |
f237c30a | 2779 | req->io_task_work.func = io_free_req_work; |
4813c377 | 2780 | io_req_task_work_add(req, false); |
543af3a1 | 2781 | } |
216578e5 PB |
2782 | } |
2783 | ||
6c503150 | 2784 | static unsigned io_cqring_events(struct io_ring_ctx *ctx) |
a3a0e43f JA |
2785 | { |
2786 | /* See comment at the top of this file */ | |
2787 | smp_rmb(); | |
e23de15f | 2788 | return __io_cqring_events(ctx); |
a3a0e43f JA |
2789 | } |
2790 | ||
fb5ccc98 PB |
2791 | static inline unsigned int io_sqring_entries(struct io_ring_ctx *ctx) |
2792 | { | |
2793 | struct io_rings *rings = ctx->rings; | |
2794 | ||
2795 | /* make sure SQ entry isn't read before tail */ | |
2796 | return smp_load_acquire(&rings->sq.tail) - ctx->cached_sq_head; | |
2797 | } | |
2798 | ||
4c6e277c JA |
2799 | static inline bool io_run_task_work(void) |
2800 | { | |
7f62d40d | 2801 | if (test_thread_flag(TIF_NOTIFY_SIGNAL) || task_work_pending(current)) { |
4c6e277c | 2802 | __set_current_state(TASK_RUNNING); |
7c5d8fa6 EB |
2803 | clear_notify_signal(); |
2804 | if (task_work_pending(current)) | |
2805 | task_work_run(); | |
4c6e277c JA |
2806 | return true; |
2807 | } | |
2808 | ||
2809 | return false; | |
bcda7baa JA |
2810 | } |
2811 | ||
5ba3c874 | 2812 | static int io_do_iopoll(struct io_ring_ctx *ctx, bool force_nonspin) |
def596e9 | 2813 | { |
5eef4e87 | 2814 | struct io_wq_work_node *pos, *start, *prev; |
d729cf9a | 2815 | unsigned int poll_flags = BLK_POLL_NOSLEEP; |
b688f11e | 2816 | DEFINE_IO_COMP_BATCH(iob); |
5ba3c874 | 2817 | int nr_events = 0; |
def596e9 JA |
2818 | |
2819 | /* | |
2820 | * Only spin for completions if we don't have multiple devices hanging | |
87a115fb | 2821 | * off our complete list. |
def596e9 | 2822 | */ |
87a115fb | 2823 | if (ctx->poll_multi_queue || force_nonspin) |
ef99b2d3 | 2824 | poll_flags |= BLK_POLL_ONESHOT; |
def596e9 | 2825 | |
5eef4e87 PB |
2826 | wq_list_for_each(pos, start, &ctx->iopoll_list) { |
2827 | struct io_kiocb *req = container_of(pos, struct io_kiocb, comp_list); | |
9adbd45d | 2828 | struct kiocb *kiocb = &req->rw.kiocb; |
a2416e1e | 2829 | int ret; |
def596e9 JA |
2830 | |
2831 | /* | |
581f9810 BM |
2832 | * Move completed and retryable entries to our local lists. |
2833 | * If we find a request that requires polling, break out | |
2834 | * and complete those lists first, if we have entries there. | |
def596e9 | 2835 | */ |
e3f721e6 | 2836 | if (READ_ONCE(req->iopoll_completed)) |
def596e9 JA |
2837 | break; |
2838 | ||
b688f11e | 2839 | ret = kiocb->ki_filp->f_op->iopoll(kiocb, &iob, poll_flags); |
a2416e1e PB |
2840 | if (unlikely(ret < 0)) |
2841 | return ret; | |
2842 | else if (ret) | |
ef99b2d3 | 2843 | poll_flags |= BLK_POLL_ONESHOT; |
def596e9 | 2844 | |
3aadc23e | 2845 | /* iopoll may have completed current req */ |
b688f11e JA |
2846 | if (!rq_list_empty(iob.req_list) || |
2847 | READ_ONCE(req->iopoll_completed)) | |
e3f721e6 | 2848 | break; |
def596e9 JA |
2849 | } |
2850 | ||
b688f11e JA |
2851 | if (!rq_list_empty(iob.req_list)) |
2852 | iob.complete(&iob); | |
5eef4e87 PB |
2853 | else if (!pos) |
2854 | return 0; | |
def596e9 | 2855 | |
5eef4e87 PB |
2856 | prev = start; |
2857 | wq_list_for_each_resume(pos, prev) { | |
2858 | struct io_kiocb *req = container_of(pos, struct io_kiocb, comp_list); | |
2859 | ||
b3fa03fd PB |
2860 | /* order with io_complete_rw_iopoll(), e.g. ->result updates */ |
2861 | if (!smp_load_acquire(&req->iopoll_completed)) | |
e3f721e6 | 2862 | break; |
c0713540 | 2863 | nr_events++; |
83a13a41 PB |
2864 | if (unlikely(req->flags & REQ_F_CQE_SKIP)) |
2865 | continue; | |
cef216fc | 2866 | __io_fill_cqe_req(req, req->cqe.res, io_put_kbuf(req, 0)); |
e3f721e6 | 2867 | } |
def596e9 | 2868 | |
f5ed3bcd PB |
2869 | if (unlikely(!nr_events)) |
2870 | return 0; | |
2871 | ||
2872 | io_commit_cqring(ctx); | |
2873 | io_cqring_ev_posted_iopoll(ctx); | |
1cce17ac | 2874 | pos = start ? start->next : ctx->iopoll_list.first; |
5eef4e87 | 2875 | wq_list_cut(&ctx->iopoll_list, prev, start); |
1cce17ac | 2876 | io_free_batch_list(ctx, pos); |
5ba3c874 | 2877 | return nr_events; |
def596e9 JA |
2878 | } |
2879 | ||
def596e9 JA |
2880 | /* |
2881 | * We can't just wait for polled events to come to us, we have to actively | |
2882 | * find and complete them. | |
2883 | */ | |
c072481d | 2884 | static __cold void io_iopoll_try_reap_events(struct io_ring_ctx *ctx) |
def596e9 JA |
2885 | { |
2886 | if (!(ctx->flags & IORING_SETUP_IOPOLL)) | |
2887 | return; | |
2888 | ||
2889 | mutex_lock(&ctx->uring_lock); | |
5eef4e87 | 2890 | while (!wq_list_empty(&ctx->iopoll_list)) { |
b2edc0a7 | 2891 | /* let it sleep and repeat later if can't complete a request */ |
5ba3c874 | 2892 | if (io_do_iopoll(ctx, true) == 0) |
b2edc0a7 | 2893 | break; |
08f5439f JA |
2894 | /* |
2895 | * Ensure we allow local-to-the-cpu processing to take place, | |
2896 | * in this case we need to ensure that we reap all events. | |
3fcee5a6 | 2897 | * Also let task_work, etc. to progress by releasing the mutex |
08f5439f | 2898 | */ |
3fcee5a6 PB |
2899 | if (need_resched()) { |
2900 | mutex_unlock(&ctx->uring_lock); | |
2901 | cond_resched(); | |
2902 | mutex_lock(&ctx->uring_lock); | |
2903 | } | |
def596e9 JA |
2904 | } |
2905 | mutex_unlock(&ctx->uring_lock); | |
2906 | } | |
2907 | ||
7668b92a | 2908 | static int io_iopoll_check(struct io_ring_ctx *ctx, long min) |
def596e9 | 2909 | { |
7668b92a | 2910 | unsigned int nr_events = 0; |
e9979b36 | 2911 | int ret = 0; |
500f9fba | 2912 | |
f39c8a5b PB |
2913 | /* |
2914 | * Don't enter poll loop if we already have events pending. | |
2915 | * If we do, we can potentially be spinning for commands that | |
2916 | * already triggered a CQE (eg in error). | |
2917 | */ | |
5ed7a37d | 2918 | if (test_bit(0, &ctx->check_cq_overflow)) |
f39c8a5b PB |
2919 | __io_cqring_overflow_flush(ctx, false); |
2920 | if (io_cqring_events(ctx)) | |
d487b43c | 2921 | return 0; |
def596e9 | 2922 | do { |
500f9fba JA |
2923 | /* |
2924 | * If a submit got punted to a workqueue, we can have the | |
2925 | * application entering polling for a command before it gets | |
2926 | * issued. That app will hold the uring_lock for the duration | |
2927 | * of the poll right here, so we need to take a breather every | |
2928 | * now and then to ensure that the issue has a chance to add | |
2929 | * the poll to the issued list. Otherwise we can spin here | |
2930 | * forever, while the workqueue is stuck trying to acquire the | |
2931 | * very same mutex. | |
2932 | */ | |
5eef4e87 | 2933 | if (wq_list_empty(&ctx->iopoll_list)) { |
8f487ef2 PB |
2934 | u32 tail = ctx->cached_cq_tail; |
2935 | ||
500f9fba | 2936 | mutex_unlock(&ctx->uring_lock); |
4c6e277c | 2937 | io_run_task_work(); |
500f9fba | 2938 | mutex_lock(&ctx->uring_lock); |
def596e9 | 2939 | |
8f487ef2 PB |
2940 | /* some requests don't go through iopoll_list */ |
2941 | if (tail != ctx->cached_cq_tail || | |
5eef4e87 | 2942 | wq_list_empty(&ctx->iopoll_list)) |
e9979b36 | 2943 | break; |
500f9fba | 2944 | } |
5ba3c874 PB |
2945 | ret = io_do_iopoll(ctx, !min); |
2946 | if (ret < 0) | |
2947 | break; | |
2948 | nr_events += ret; | |
2949 | ret = 0; | |
2950 | } while (nr_events < min && !need_resched()); | |
d487b43c | 2951 | |
def596e9 JA |
2952 | return ret; |
2953 | } | |
2954 | ||
491381ce | 2955 | static void kiocb_end_write(struct io_kiocb *req) |
2b188cc1 | 2956 | { |
491381ce JA |
2957 | /* |
2958 | * Tell lockdep we inherited freeze protection from submission | |
2959 | * thread. | |
2960 | */ | |
2961 | if (req->flags & REQ_F_ISREG) { | |
1c98679d | 2962 | struct super_block *sb = file_inode(req->file)->i_sb; |
2b188cc1 | 2963 | |
1c98679d PB |
2964 | __sb_writers_acquired(sb, SB_FREEZE_WRITE); |
2965 | sb_end_write(sb); | |
2b188cc1 JA |
2966 | } |
2967 | } | |
2968 | ||
b63534c4 | 2969 | #ifdef CONFIG_BLOCK |
dc2a6e9a | 2970 | static bool io_resubmit_prep(struct io_kiocb *req) |
b63534c4 | 2971 | { |
ab454438 | 2972 | struct io_async_rw *rw = req->async_data; |
b63534c4 | 2973 | |
d886e185 | 2974 | if (!req_has_async_data(req)) |
ab454438 | 2975 | return !io_req_prep_async(req); |
538941e2 | 2976 | iov_iter_restore(&rw->s.iter, &rw->s.iter_state); |
ab454438 | 2977 | return true; |
b63534c4 | 2978 | } |
b63534c4 | 2979 | |
3e6a0d3c | 2980 | static bool io_rw_should_reissue(struct io_kiocb *req) |
b63534c4 | 2981 | { |
355afaeb | 2982 | umode_t mode = file_inode(req->file)->i_mode; |
3e6a0d3c | 2983 | struct io_ring_ctx *ctx = req->ctx; |
b63534c4 | 2984 | |
355afaeb JA |
2985 | if (!S_ISBLK(mode) && !S_ISREG(mode)) |
2986 | return false; | |
3e6a0d3c JA |
2987 | if ((req->flags & REQ_F_NOWAIT) || (io_wq_current_is_worker() && |
2988 | !(ctx->flags & IORING_SETUP_IOPOLL))) | |
b63534c4 | 2989 | return false; |
7c977a58 JA |
2990 | /* |
2991 | * If ref is dying, we might be running poll reap from the exit work. | |
2992 | * Don't attempt to reissue from that path, just let it fail with | |
2993 | * -EAGAIN. | |
2994 | */ | |
3e6a0d3c JA |
2995 | if (percpu_ref_is_dying(&ctx->refs)) |
2996 | return false; | |
ef046888 JA |
2997 | /* |
2998 | * Play it safe and assume not safe to re-import and reissue if we're | |
2999 | * not in the original thread group (or in task context). | |
3000 | */ | |
3001 | if (!same_thread_group(req->task, current) || !in_task()) | |
3002 | return false; | |
3e6a0d3c JA |
3003 | return true; |
3004 | } | |
e82ad485 | 3005 | #else |
a1ff1e3f | 3006 | static bool io_resubmit_prep(struct io_kiocb *req) |
e82ad485 JA |
3007 | { |
3008 | return false; | |
3009 | } | |
e82ad485 | 3010 | static bool io_rw_should_reissue(struct io_kiocb *req) |
3e6a0d3c | 3011 | { |
b63534c4 JA |
3012 | return false; |
3013 | } | |
3e6a0d3c | 3014 | #endif |
b63534c4 | 3015 | |
8ef12efe | 3016 | static bool __io_complete_rw_common(struct io_kiocb *req, long res) |
a1d7c393 | 3017 | { |
f63cf519 | 3018 | if (req->rw.kiocb.ki_flags & IOCB_WRITE) { |
b65c128f | 3019 | kiocb_end_write(req); |
f63cf519 JA |
3020 | fsnotify_modify(req->file); |
3021 | } else { | |
3022 | fsnotify_access(req->file); | |
3023 | } | |
cef216fc | 3024 | if (unlikely(res != req->cqe.res)) { |
9532b99b PB |
3025 | if ((res == -EAGAIN || res == -EOPNOTSUPP) && |
3026 | io_rw_should_reissue(req)) { | |
3027 | req->flags |= REQ_F_REISSUE; | |
8ef12efe | 3028 | return true; |
9532b99b | 3029 | } |
93d2bcd2 | 3030 | req_set_fail(req); |
cef216fc | 3031 | req->cqe.res = res; |
9532b99b | 3032 | } |
8ef12efe JA |
3033 | return false; |
3034 | } | |
3035 | ||
cc8e9ba7 | 3036 | static inline void io_req_task_complete(struct io_kiocb *req, bool *locked) |
8ef12efe | 3037 | { |
cef216fc | 3038 | int res = req->cqe.res; |
126180b9 PB |
3039 | |
3040 | if (*locked) { | |
cc3cec83 | 3041 | io_req_complete_state(req, res, io_put_kbuf(req, 0)); |
fff4e40e | 3042 | io_req_add_compl_list(req); |
126180b9 | 3043 | } else { |
cc3cec83 JA |
3044 | io_req_complete_post(req, res, |
3045 | io_put_kbuf(req, IO_URING_F_UNLOCKED)); | |
126180b9 | 3046 | } |
8ef12efe JA |
3047 | } |
3048 | ||
00f6e68b | 3049 | static void __io_complete_rw(struct io_kiocb *req, long res, |
8ef12efe JA |
3050 | unsigned int issue_flags) |
3051 | { | |
3052 | if (__io_complete_rw_common(req, res)) | |
3053 | return; | |
cef216fc | 3054 | __io_req_complete(req, issue_flags, req->cqe.res, |
cc3cec83 | 3055 | io_put_kbuf(req, issue_flags)); |
ba816ad6 JA |
3056 | } |
3057 | ||
6b19b766 | 3058 | static void io_complete_rw(struct kiocb *kiocb, long res) |
ba816ad6 | 3059 | { |
9adbd45d | 3060 | struct io_kiocb *req = container_of(kiocb, struct io_kiocb, rw.kiocb); |
ba816ad6 | 3061 | |
8ef12efe JA |
3062 | if (__io_complete_rw_common(req, res)) |
3063 | return; | |
cef216fc | 3064 | req->cqe.res = res; |
8ef12efe | 3065 | req->io_task_work.func = io_req_task_complete; |
f28c240e | 3066 | io_req_task_work_add(req, !!(req->ctx->flags & IORING_SETUP_SQPOLL)); |
2b188cc1 JA |
3067 | } |
3068 | ||
6b19b766 | 3069 | static void io_complete_rw_iopoll(struct kiocb *kiocb, long res) |
def596e9 | 3070 | { |
9adbd45d | 3071 | struct io_kiocb *req = container_of(kiocb, struct io_kiocb, rw.kiocb); |
def596e9 | 3072 | |
491381ce JA |
3073 | if (kiocb->ki_flags & IOCB_WRITE) |
3074 | kiocb_end_write(req); | |
cef216fc | 3075 | if (unlikely(res != req->cqe.res)) { |
b66ceaf3 PB |
3076 | if (res == -EAGAIN && io_rw_should_reissue(req)) { |
3077 | req->flags |= REQ_F_REISSUE; | |
3078 | return; | |
9532b99b | 3079 | } |
cef216fc | 3080 | req->cqe.res = res; |
8c130827 | 3081 | } |
bbde017a | 3082 | |
b3fa03fd PB |
3083 | /* order with io_iopoll_complete() checking ->iopoll_completed */ |
3084 | smp_store_release(&req->iopoll_completed, 1); | |
def596e9 JA |
3085 | } |
3086 | ||
3087 | /* | |
3088 | * After the iocb has been issued, it's safe to be found on the poll list. | |
3089 | * Adding the kiocb to the list AFTER submission ensures that we don't | |
f39c8a5b | 3090 | * find it from a io_do_iopoll() thread before the issuer is done |
def596e9 JA |
3091 | * accessing the kiocb cookie. |
3092 | */ | |
9882131c | 3093 | static void io_iopoll_req_issued(struct io_kiocb *req, unsigned int issue_flags) |
def596e9 JA |
3094 | { |
3095 | struct io_ring_ctx *ctx = req->ctx; | |
3b44b371 | 3096 | const bool needs_lock = issue_flags & IO_URING_F_UNLOCKED; |
cb3d8972 PB |
3097 | |
3098 | /* workqueue context doesn't hold uring_lock, grab it now */ | |
3b44b371 | 3099 | if (unlikely(needs_lock)) |
cb3d8972 | 3100 | mutex_lock(&ctx->uring_lock); |
def596e9 JA |
3101 | |
3102 | /* | |
3103 | * Track whether we have multiple files in our lists. This will impact | |
3104 | * how we do polling eventually, not spinning if we're on potentially | |
3105 | * different devices. | |
3106 | */ | |
5eef4e87 | 3107 | if (wq_list_empty(&ctx->iopoll_list)) { |
915b3dde HX |
3108 | ctx->poll_multi_queue = false; |
3109 | } else if (!ctx->poll_multi_queue) { | |
def596e9 JA |
3110 | struct io_kiocb *list_req; |
3111 | ||
5eef4e87 PB |
3112 | list_req = container_of(ctx->iopoll_list.first, struct io_kiocb, |
3113 | comp_list); | |
30da1b45 | 3114 | if (list_req->file != req->file) |
915b3dde | 3115 | ctx->poll_multi_queue = true; |
def596e9 JA |
3116 | } |
3117 | ||
3118 | /* | |
3119 | * For fast devices, IO may have already completed. If it has, add | |
3120 | * it to the front so we find it first. | |
3121 | */ | |
65a6543d | 3122 | if (READ_ONCE(req->iopoll_completed)) |
5eef4e87 | 3123 | wq_list_add_head(&req->comp_list, &ctx->iopoll_list); |
def596e9 | 3124 | else |
5eef4e87 | 3125 | wq_list_add_tail(&req->comp_list, &ctx->iopoll_list); |
bdcd3eab | 3126 | |
3b44b371 | 3127 | if (unlikely(needs_lock)) { |
cb3d8972 PB |
3128 | /* |
3129 | * If IORING_SETUP_SQPOLL is enabled, sqes are either handle | |
3130 | * in sq thread task context or in io worker task context. If | |
3131 | * current task context is sq thread, we don't need to check | |
3132 | * whether should wake up sq thread. | |
3133 | */ | |
3134 | if ((ctx->flags & IORING_SETUP_SQPOLL) && | |
3135 | wq_has_sleeper(&ctx->sq_data->wait)) | |
3136 | wake_up(&ctx->sq_data->wait); | |
3137 | ||
3138 | mutex_unlock(&ctx->uring_lock); | |
3139 | } | |
def596e9 JA |
3140 | } |
3141 | ||
4503b767 JA |
3142 | static bool io_bdev_nowait(struct block_device *bdev) |
3143 | { | |
9ba0d0c8 | 3144 | return !bdev || blk_queue_nowait(bdev_get_queue(bdev)); |
4503b767 JA |
3145 | } |
3146 | ||
2b188cc1 JA |
3147 | /* |
3148 | * If we tracked the file through the SCM inflight mechanism, we could support | |
3149 | * any file. For now, just ensure that anything potentially problematic is done | |
3150 | * inline. | |
3151 | */ | |
88459b50 | 3152 | static bool __io_file_supports_nowait(struct file *file, umode_t mode) |
2b188cc1 | 3153 | { |
4503b767 | 3154 | if (S_ISBLK(mode)) { |
4e7b5671 CH |
3155 | if (IS_ENABLED(CONFIG_BLOCK) && |
3156 | io_bdev_nowait(I_BDEV(file->f_mapping->host))) | |
4503b767 JA |
3157 | return true; |
3158 | return false; | |
3159 | } | |
976517f1 | 3160 | if (S_ISSOCK(mode)) |
2b188cc1 | 3161 | return true; |
4503b767 | 3162 | if (S_ISREG(mode)) { |
4e7b5671 CH |
3163 | if (IS_ENABLED(CONFIG_BLOCK) && |
3164 | io_bdev_nowait(file->f_inode->i_sb->s_bdev) && | |
4503b767 JA |
3165 | file->f_op != &io_uring_fops) |
3166 | return true; | |
3167 | return false; | |
3168 | } | |
2b188cc1 | 3169 | |
c5b85625 JA |
3170 | /* any ->read/write should understand O_NONBLOCK */ |
3171 | if (file->f_flags & O_NONBLOCK) | |
3172 | return true; | |
35645ac3 | 3173 | return file->f_mode & FMODE_NOWAIT; |
2b188cc1 | 3174 | } |
c5b85625 | 3175 | |
88459b50 PB |
3176 | /* |
3177 | * If we tracked the file through the SCM inflight mechanism, we could support | |
3178 | * any file. For now, just ensure that anything potentially problematic is done | |
3179 | * inline. | |
3180 | */ | |
3181 | static unsigned int io_file_get_flags(struct file *file) | |
3182 | { | |
3183 | umode_t mode = file_inode(file)->i_mode; | |
3184 | unsigned int res = 0; | |
af197f50 | 3185 | |
88459b50 PB |
3186 | if (S_ISREG(mode)) |
3187 | res |= FFS_ISREG; | |
3188 | if (__io_file_supports_nowait(file, mode)) | |
3189 | res |= FFS_NOWAIT; | |
3190 | return res; | |
2b188cc1 JA |
3191 | } |
3192 | ||
35645ac3 | 3193 | static inline bool io_file_supports_nowait(struct io_kiocb *req) |
7b29f92d | 3194 | { |
88459b50 | 3195 | return req->flags & REQ_F_SUPPORT_NOWAIT; |
7b29f92d JA |
3196 | } |
3197 | ||
b9a6b8f9 | 3198 | static int io_prep_rw(struct io_kiocb *req, const struct io_uring_sqe *sqe) |
2b188cc1 | 3199 | { |
9adbd45d | 3200 | struct kiocb *kiocb = &req->rw.kiocb; |
09bb8394 JA |
3201 | unsigned ioprio; |
3202 | int ret; | |
2b188cc1 | 3203 | |
2b188cc1 | 3204 | kiocb->ki_pos = READ_ONCE(sqe->off); |
9adbd45d | 3205 | |
fb27274a PB |
3206 | ioprio = READ_ONCE(sqe->ioprio); |
3207 | if (ioprio) { | |
3208 | ret = ioprio_check_cap(ioprio); | |
3209 | if (ret) | |
3210 | return ret; | |
3211 | ||
3212 | kiocb->ki_ioprio = ioprio; | |
3213 | } else { | |
3214 | kiocb->ki_ioprio = get_current_ioprio(); | |
eae071c9 PB |
3215 | } |
3216 | ||
578c0ee2 | 3217 | req->imu = NULL; |
3529d8c2 JA |
3218 | req->rw.addr = READ_ONCE(sqe->addr); |
3219 | req->rw.len = READ_ONCE(sqe->len); | |
584b0180 | 3220 | req->rw.flags = READ_ONCE(sqe->rw_flags); |
4f4eeba8 | 3221 | req->buf_index = READ_ONCE(sqe->buf_index); |
2b188cc1 | 3222 | return 0; |
2b188cc1 JA |
3223 | } |
3224 | ||
3225 | static inline void io_rw_done(struct kiocb *kiocb, ssize_t ret) | |
3226 | { | |
3227 | switch (ret) { | |
3228 | case -EIOCBQUEUED: | |
3229 | break; | |
3230 | case -ERESTARTSYS: | |
3231 | case -ERESTARTNOINTR: | |
3232 | case -ERESTARTNOHAND: | |
3233 | case -ERESTART_RESTARTBLOCK: | |
3234 | /* | |
3235 | * We can't just restart the syscall, since previously | |
3236 | * submitted sqes may already be in progress. Just fail this | |
3237 | * IO with EINTR. | |
3238 | */ | |
3239 | ret = -EINTR; | |
df561f66 | 3240 | fallthrough; |
2b188cc1 | 3241 | default: |
6b19b766 | 3242 | kiocb->ki_complete(kiocb, ret); |
2b188cc1 JA |
3243 | } |
3244 | } | |
3245 | ||
b4aec400 | 3246 | static inline loff_t *io_kiocb_update_pos(struct io_kiocb *req) |
d34e1e5b DY |
3247 | { |
3248 | struct kiocb *kiocb = &req->rw.kiocb; | |
3249 | ||
6f83ab22 JA |
3250 | if (kiocb->ki_pos != -1) |
3251 | return &kiocb->ki_pos; | |
3252 | ||
3253 | if (!(req->file->f_mode & FMODE_STREAM)) { | |
3254 | req->flags |= REQ_F_CUR_POS; | |
3255 | kiocb->ki_pos = req->file->f_pos; | |
3256 | return &kiocb->ki_pos; | |
d34e1e5b | 3257 | } |
6f83ab22 JA |
3258 | |
3259 | kiocb->ki_pos = 0; | |
3260 | return NULL; | |
d34e1e5b DY |
3261 | } |
3262 | ||
2ea537ca | 3263 | static void kiocb_done(struct io_kiocb *req, ssize_t ret, |
889fca73 | 3264 | unsigned int issue_flags) |
ba816ad6 | 3265 | { |
e8c2bc1f | 3266 | struct io_async_rw *io = req->async_data; |
ba04291e | 3267 | |
227c0c96 | 3268 | /* add previously done IO, if any */ |
d886e185 | 3269 | if (req_has_async_data(req) && io->bytes_done > 0) { |
227c0c96 | 3270 | if (ret < 0) |
e8c2bc1f | 3271 | ret = io->bytes_done; |
227c0c96 | 3272 | else |
e8c2bc1f | 3273 | ret += io->bytes_done; |
227c0c96 JA |
3274 | } |
3275 | ||
ba04291e | 3276 | if (req->flags & REQ_F_CUR_POS) |
2ea537ca PB |
3277 | req->file->f_pos = req->rw.kiocb.ki_pos; |
3278 | if (ret >= 0 && (req->rw.kiocb.ki_complete == io_complete_rw)) | |
00f6e68b | 3279 | __io_complete_rw(req, ret, issue_flags); |
ba816ad6 | 3280 | else |
2ea537ca | 3281 | io_rw_done(&req->rw.kiocb, ret); |
97284637 | 3282 | |
b66ceaf3 | 3283 | if (req->flags & REQ_F_REISSUE) { |
97284637 | 3284 | req->flags &= ~REQ_F_REISSUE; |
b91ef187 | 3285 | if (io_resubmit_prep(req)) |
773af691 | 3286 | io_req_task_queue_reissue(req); |
b91ef187 PB |
3287 | else |
3288 | io_req_task_queue_fail(req, ret); | |
97284637 | 3289 | } |
ba816ad6 JA |
3290 | } |
3291 | ||
eae071c9 PB |
3292 | static int __io_import_fixed(struct io_kiocb *req, int rw, struct iov_iter *iter, |
3293 | struct io_mapped_ubuf *imu) | |
edafccee | 3294 | { |
9adbd45d | 3295 | size_t len = req->rw.len; |
75769e3f | 3296 | u64 buf_end, buf_addr = req->rw.addr; |
edafccee | 3297 | size_t offset; |
edafccee | 3298 | |
75769e3f | 3299 | if (unlikely(check_add_overflow(buf_addr, (u64)len, &buf_end))) |
edafccee JA |
3300 | return -EFAULT; |
3301 | /* not inside the mapped region */ | |
4751f53d | 3302 | if (unlikely(buf_addr < imu->ubuf || buf_end > imu->ubuf_end)) |
edafccee JA |
3303 | return -EFAULT; |
3304 | ||
3305 | /* | |
3306 | * May not be a start of buffer, set size appropriately | |
3307 | * and advance us to the beginning. | |
3308 | */ | |
3309 | offset = buf_addr - imu->ubuf; | |
3310 | iov_iter_bvec(iter, rw, imu->bvec, imu->nr_bvecs, offset + len); | |
bd11b3a3 JA |
3311 | |
3312 | if (offset) { | |
3313 | /* | |
3314 | * Don't use iov_iter_advance() here, as it's really slow for | |
3315 | * using the latter parts of a big fixed buffer - it iterates | |
3316 | * over each segment manually. We can cheat a bit here, because | |
3317 | * we know that: | |
3318 | * | |
3319 | * 1) it's a BVEC iter, we set it up | |
3320 | * 2) all bvecs are PAGE_SIZE in size, except potentially the | |
3321 | * first and last bvec | |
3322 | * | |
3323 | * So just find our index, and adjust the iterator afterwards. | |
3324 | * If the offset is within the first bvec (or the whole first | |
3325 | * bvec, just use iov_iter_advance(). This makes it easier | |
3326 | * since we can just skip the first segment, which may not | |
3327 | * be PAGE_SIZE aligned. | |
3328 | */ | |
3329 | const struct bio_vec *bvec = imu->bvec; | |
3330 | ||
3331 | if (offset <= bvec->bv_len) { | |
3332 | iov_iter_advance(iter, offset); | |
3333 | } else { | |
3334 | unsigned long seg_skip; | |
3335 | ||
3336 | /* skip first vec */ | |
3337 | offset -= bvec->bv_len; | |
3338 | seg_skip = 1 + (offset >> PAGE_SHIFT); | |
3339 | ||
3340 | iter->bvec = bvec + seg_skip; | |
3341 | iter->nr_segs -= seg_skip; | |
99c79f66 | 3342 | iter->count -= bvec->bv_len + offset; |
bd11b3a3 | 3343 | iter->iov_offset = offset & ~PAGE_MASK; |
bd11b3a3 JA |
3344 | } |
3345 | } | |
3346 | ||
847595de | 3347 | return 0; |
edafccee JA |
3348 | } |
3349 | ||
5106dd6e JA |
3350 | static int io_import_fixed(struct io_kiocb *req, int rw, struct iov_iter *iter, |
3351 | unsigned int issue_flags) | |
eae071c9 | 3352 | { |
eae071c9 PB |
3353 | struct io_mapped_ubuf *imu = req->imu; |
3354 | u16 index, buf_index = req->buf_index; | |
3355 | ||
3356 | if (likely(!imu)) { | |
578c0ee2 PB |
3357 | struct io_ring_ctx *ctx = req->ctx; |
3358 | ||
eae071c9 PB |
3359 | if (unlikely(buf_index >= ctx->nr_user_bufs)) |
3360 | return -EFAULT; | |
5106dd6e | 3361 | io_req_set_rsrc_node(req, ctx, issue_flags); |
eae071c9 PB |
3362 | index = array_index_nospec(buf_index, ctx->nr_user_bufs); |
3363 | imu = READ_ONCE(ctx->user_bufs[index]); | |
3364 | req->imu = imu; | |
3365 | } | |
3366 | return __io_import_fixed(req, rw, iter, imu); | |
3367 | } | |
3368 | ||
dbc7d452 JA |
3369 | static void io_buffer_add_list(struct io_ring_ctx *ctx, |
3370 | struct io_buffer_list *bl, unsigned int bgid) | |
3371 | { | |
3372 | struct list_head *list; | |
3373 | ||
3374 | list = &ctx->io_buffers[hash_32(bgid, IO_BUFFERS_HASH_BITS)]; | |
3375 | INIT_LIST_HEAD(&bl->buf_list); | |
3376 | bl->bgid = bgid; | |
3377 | list_add(&bl->list, list); | |
3378 | } | |
3379 | ||
bcda7baa | 3380 | static struct io_buffer *io_buffer_select(struct io_kiocb *req, size_t *len, |
51aac424 | 3381 | int bgid, unsigned int issue_flags) |
bcda7baa | 3382 | { |
30d51dd4 | 3383 | struct io_buffer *kbuf = req->kbuf; |
dbc7d452 JA |
3384 | struct io_ring_ctx *ctx = req->ctx; |
3385 | struct io_buffer_list *bl; | |
bcda7baa JA |
3386 | |
3387 | if (req->flags & REQ_F_BUFFER_SELECTED) | |
3388 | return kbuf; | |
3389 | ||
f8929630 | 3390 | io_ring_submit_lock(req->ctx, issue_flags); |
bcda7baa | 3391 | |
dbc7d452 JA |
3392 | bl = io_buffer_get_list(ctx, bgid); |
3393 | if (bl && !list_empty(&bl->buf_list)) { | |
3394 | kbuf = list_first_entry(&bl->buf_list, struct io_buffer, list); | |
3395 | list_del(&kbuf->list); | |
bcda7baa JA |
3396 | if (*len > kbuf->len) |
3397 | *len = kbuf->len; | |
30d51dd4 PB |
3398 | req->flags |= REQ_F_BUFFER_SELECTED; |
3399 | req->kbuf = kbuf; | |
bcda7baa JA |
3400 | } else { |
3401 | kbuf = ERR_PTR(-ENOBUFS); | |
3402 | } | |
3403 | ||
f8929630 | 3404 | io_ring_submit_unlock(req->ctx, issue_flags); |
bcda7baa JA |
3405 | return kbuf; |
3406 | } | |
3407 | ||
4d954c25 | 3408 | static void __user *io_rw_buffer_select(struct io_kiocb *req, size_t *len, |
51aac424 | 3409 | unsigned int issue_flags) |
4d954c25 JA |
3410 | { |
3411 | struct io_buffer *kbuf; | |
4f4eeba8 | 3412 | u16 bgid; |
4d954c25 | 3413 | |
4f4eeba8 | 3414 | bgid = req->buf_index; |
51aac424 | 3415 | kbuf = io_buffer_select(req, len, bgid, issue_flags); |
4d954c25 JA |
3416 | if (IS_ERR(kbuf)) |
3417 | return kbuf; | |
4d954c25 JA |
3418 | return u64_to_user_ptr(kbuf->addr); |
3419 | } | |
3420 | ||
3421 | #ifdef CONFIG_COMPAT | |
3422 | static ssize_t io_compat_import(struct io_kiocb *req, struct iovec *iov, | |
51aac424 | 3423 | unsigned int issue_flags) |
4d954c25 JA |
3424 | { |
3425 | struct compat_iovec __user *uiov; | |
3426 | compat_ssize_t clen; | |
3427 | void __user *buf; | |
3428 | ssize_t len; | |
3429 | ||
3430 | uiov = u64_to_user_ptr(req->rw.addr); | |
3431 | if (!access_ok(uiov, sizeof(*uiov))) | |
3432 | return -EFAULT; | |
3433 | if (__get_user(clen, &uiov->iov_len)) | |
3434 | return -EFAULT; | |
3435 | if (clen < 0) | |
3436 | return -EINVAL; | |
3437 | ||
3438 | len = clen; | |
51aac424 | 3439 | buf = io_rw_buffer_select(req, &len, issue_flags); |
4d954c25 JA |
3440 | if (IS_ERR(buf)) |
3441 | return PTR_ERR(buf); | |
3442 | iov[0].iov_base = buf; | |
3443 | iov[0].iov_len = (compat_size_t) len; | |
3444 | return 0; | |
3445 | } | |
3446 | #endif | |
3447 | ||
3448 | static ssize_t __io_iov_buffer_select(struct io_kiocb *req, struct iovec *iov, | |
51aac424 | 3449 | unsigned int issue_flags) |
4d954c25 JA |
3450 | { |
3451 | struct iovec __user *uiov = u64_to_user_ptr(req->rw.addr); | |
3452 | void __user *buf; | |
3453 | ssize_t len; | |
3454 | ||
3455 | if (copy_from_user(iov, uiov, sizeof(*uiov))) | |
3456 | return -EFAULT; | |
3457 | ||
3458 | len = iov[0].iov_len; | |
3459 | if (len < 0) | |
3460 | return -EINVAL; | |
51aac424 | 3461 | buf = io_rw_buffer_select(req, &len, issue_flags); |
4d954c25 JA |
3462 | if (IS_ERR(buf)) |
3463 | return PTR_ERR(buf); | |
3464 | iov[0].iov_base = buf; | |
3465 | iov[0].iov_len = len; | |
3466 | return 0; | |
3467 | } | |
3468 | ||
3469 | static ssize_t io_iov_buffer_select(struct io_kiocb *req, struct iovec *iov, | |
51aac424 | 3470 | unsigned int issue_flags) |
4d954c25 | 3471 | { |
dddb3e26 | 3472 | if (req->flags & REQ_F_BUFFER_SELECTED) { |
30d51dd4 | 3473 | struct io_buffer *kbuf = req->kbuf; |
dddb3e26 | 3474 | |
dddb3e26 JA |
3475 | iov[0].iov_base = u64_to_user_ptr(kbuf->addr); |
3476 | iov[0].iov_len = kbuf->len; | |
4d954c25 | 3477 | return 0; |
dddb3e26 | 3478 | } |
dd201662 | 3479 | if (req->rw.len != 1) |
4d954c25 JA |
3480 | return -EINVAL; |
3481 | ||
3482 | #ifdef CONFIG_COMPAT | |
3483 | if (req->ctx->compat) | |
51aac424 | 3484 | return io_compat_import(req, iov, issue_flags); |
4d954c25 JA |
3485 | #endif |
3486 | ||
51aac424 | 3487 | return __io_iov_buffer_select(req, iov, issue_flags); |
4d954c25 JA |
3488 | } |
3489 | ||
caa8fe6e PB |
3490 | static struct iovec *__io_import_iovec(int rw, struct io_kiocb *req, |
3491 | struct io_rw_state *s, | |
3492 | unsigned int issue_flags) | |
2b188cc1 | 3493 | { |
5e49c973 | 3494 | struct iov_iter *iter = &s->iter; |
847595de | 3495 | u8 opcode = req->opcode; |
caa8fe6e | 3496 | struct iovec *iovec; |
d1d681b0 PB |
3497 | void __user *buf; |
3498 | size_t sqe_len; | |
4d954c25 | 3499 | ssize_t ret; |
edafccee | 3500 | |
f3251183 | 3501 | if (opcode == IORING_OP_READ_FIXED || opcode == IORING_OP_WRITE_FIXED) { |
5106dd6e | 3502 | ret = io_import_fixed(req, rw, iter, issue_flags); |
f3251183 PB |
3503 | if (ret) |
3504 | return ERR_PTR(ret); | |
3505 | return NULL; | |
3506 | } | |
2b188cc1 | 3507 | |
bcda7baa | 3508 | /* buffer index only valid with fixed read/write, or buffer select */ |
d1d681b0 | 3509 | if (unlikely(req->buf_index && !(req->flags & REQ_F_BUFFER_SELECT))) |
caa8fe6e | 3510 | return ERR_PTR(-EINVAL); |
9adbd45d | 3511 | |
d1d681b0 PB |
3512 | buf = u64_to_user_ptr(req->rw.addr); |
3513 | sqe_len = req->rw.len; | |
9adbd45d | 3514 | |
3a6820f2 | 3515 | if (opcode == IORING_OP_READ || opcode == IORING_OP_WRITE) { |
bcda7baa | 3516 | if (req->flags & REQ_F_BUFFER_SELECT) { |
51aac424 | 3517 | buf = io_rw_buffer_select(req, &sqe_len, issue_flags); |
867a23ea | 3518 | if (IS_ERR(buf)) |
898df244 | 3519 | return ERR_CAST(buf); |
3f9d6441 | 3520 | req->rw.len = sqe_len; |
bcda7baa JA |
3521 | } |
3522 | ||
5e49c973 | 3523 | ret = import_single_range(rw, buf, sqe_len, s->fast_iov, iter); |
f3251183 PB |
3524 | if (ret) |
3525 | return ERR_PTR(ret); | |
3526 | return NULL; | |
3a6820f2 JA |
3527 | } |
3528 | ||
caa8fe6e | 3529 | iovec = s->fast_iov; |
4d954c25 | 3530 | if (req->flags & REQ_F_BUFFER_SELECT) { |
caa8fe6e | 3531 | ret = io_iov_buffer_select(req, iovec, issue_flags); |
f3251183 PB |
3532 | if (ret) |
3533 | return ERR_PTR(ret); | |
3534 | iov_iter_init(iter, rw, iovec, 1, iovec->iov_len); | |
3535 | return NULL; | |
4d954c25 JA |
3536 | } |
3537 | ||
caa8fe6e | 3538 | ret = __import_iovec(rw, buf, sqe_len, UIO_FASTIOV, &iovec, iter, |
89cd35c5 | 3539 | req->ctx->compat); |
caa8fe6e PB |
3540 | if (unlikely(ret < 0)) |
3541 | return ERR_PTR(ret); | |
3542 | return iovec; | |
2b188cc1 JA |
3543 | } |
3544 | ||
5e49c973 PB |
3545 | static inline int io_import_iovec(int rw, struct io_kiocb *req, |
3546 | struct iovec **iovec, struct io_rw_state *s, | |
3547 | unsigned int issue_flags) | |
3548 | { | |
caa8fe6e PB |
3549 | *iovec = __io_import_iovec(rw, req, s, issue_flags); |
3550 | if (unlikely(IS_ERR(*iovec))) | |
3551 | return PTR_ERR(*iovec); | |
5e49c973 | 3552 | |
5e49c973 | 3553 | iov_iter_save_state(&s->iter, &s->iter_state); |
caa8fe6e | 3554 | return 0; |
2b188cc1 JA |
3555 | } |
3556 | ||
0fef9483 JA |
3557 | static inline loff_t *io_kiocb_ppos(struct kiocb *kiocb) |
3558 | { | |
5b09e37e | 3559 | return (kiocb->ki_filp->f_mode & FMODE_STREAM) ? NULL : &kiocb->ki_pos; |
0fef9483 JA |
3560 | } |
3561 | ||
31b51510 | 3562 | /* |
32960613 JA |
3563 | * For files that don't have ->read_iter() and ->write_iter(), handle them |
3564 | * by looping over ->read() or ->write() manually. | |
31b51510 | 3565 | */ |
4017eb91 | 3566 | static ssize_t loop_rw_iter(int rw, struct io_kiocb *req, struct iov_iter *iter) |
32960613 | 3567 | { |
4017eb91 JA |
3568 | struct kiocb *kiocb = &req->rw.kiocb; |
3569 | struct file *file = req->file; | |
32960613 | 3570 | ssize_t ret = 0; |
af9c45ec | 3571 | loff_t *ppos; |
32960613 JA |
3572 | |
3573 | /* | |
3574 | * Don't support polled IO through this interface, and we can't | |
3575 | * support non-blocking either. For the latter, this just causes | |
3576 | * the kiocb to be handled from an async context. | |
3577 | */ | |
3578 | if (kiocb->ki_flags & IOCB_HIPRI) | |
3579 | return -EOPNOTSUPP; | |
35645ac3 PB |
3580 | if ((kiocb->ki_flags & IOCB_NOWAIT) && |
3581 | !(kiocb->ki_filp->f_flags & O_NONBLOCK)) | |
32960613 JA |
3582 | return -EAGAIN; |
3583 | ||
af9c45ec DY |
3584 | ppos = io_kiocb_ppos(kiocb); |
3585 | ||
32960613 | 3586 | while (iov_iter_count(iter)) { |
311ae9e1 | 3587 | struct iovec iovec; |
32960613 JA |
3588 | ssize_t nr; |
3589 | ||
311ae9e1 PB |
3590 | if (!iov_iter_is_bvec(iter)) { |
3591 | iovec = iov_iter_iovec(iter); | |
3592 | } else { | |
4017eb91 JA |
3593 | iovec.iov_base = u64_to_user_ptr(req->rw.addr); |
3594 | iovec.iov_len = req->rw.len; | |
311ae9e1 PB |
3595 | } |
3596 | ||
32960613 JA |
3597 | if (rw == READ) { |
3598 | nr = file->f_op->read(file, iovec.iov_base, | |
af9c45ec | 3599 | iovec.iov_len, ppos); |
32960613 JA |
3600 | } else { |
3601 | nr = file->f_op->write(file, iovec.iov_base, | |
af9c45ec | 3602 | iovec.iov_len, ppos); |
32960613 JA |
3603 | } |
3604 | ||
3605 | if (nr < 0) { | |
3606 | if (!ret) | |
3607 | ret = nr; | |
3608 | break; | |
3609 | } | |
5e929367 | 3610 | ret += nr; |
16c8d2df JA |
3611 | if (!iov_iter_is_bvec(iter)) { |
3612 | iov_iter_advance(iter, nr); | |
3613 | } else { | |
16c8d2df | 3614 | req->rw.addr += nr; |
5e929367 JA |
3615 | req->rw.len -= nr; |
3616 | if (!req->rw.len) | |
3617 | break; | |
16c8d2df | 3618 | } |
32960613 JA |
3619 | if (nr != iovec.iov_len) |
3620 | break; | |
32960613 JA |
3621 | } |
3622 | ||
3623 | return ret; | |
3624 | } | |
3625 | ||
ff6165b2 JA |
3626 | static void io_req_map_rw(struct io_kiocb *req, const struct iovec *iovec, |
3627 | const struct iovec *fast_iov, struct iov_iter *iter) | |
f67676d1 | 3628 | { |
e8c2bc1f | 3629 | struct io_async_rw *rw = req->async_data; |
b64e3444 | 3630 | |
538941e2 | 3631 | memcpy(&rw->s.iter, iter, sizeof(*iter)); |
afb87658 | 3632 | rw->free_iovec = iovec; |
227c0c96 | 3633 | rw->bytes_done = 0; |
ff6165b2 | 3634 | /* can only be fixed buffers, no need to do anything */ |
9c3a205c | 3635 | if (iov_iter_is_bvec(iter)) |
ff6165b2 | 3636 | return; |
b64e3444 | 3637 | if (!iovec) { |
ff6165b2 JA |
3638 | unsigned iov_off = 0; |
3639 | ||
538941e2 | 3640 | rw->s.iter.iov = rw->s.fast_iov; |
ff6165b2 JA |
3641 | if (iter->iov != fast_iov) { |
3642 | iov_off = iter->iov - fast_iov; | |
538941e2 | 3643 | rw->s.iter.iov += iov_off; |
ff6165b2 | 3644 | } |
538941e2 PB |
3645 | if (rw->s.fast_iov != fast_iov) |
3646 | memcpy(rw->s.fast_iov + iov_off, fast_iov + iov_off, | |
45097dae | 3647 | sizeof(struct iovec) * iter->nr_segs); |
99bc4c38 PB |
3648 | } else { |
3649 | req->flags |= REQ_F_NEED_CLEANUP; | |
f67676d1 JA |
3650 | } |
3651 | } | |
3652 | ||
8d4af685 | 3653 | static inline bool io_alloc_async_data(struct io_kiocb *req) |
3d9932a8 | 3654 | { |
e8c2bc1f JA |
3655 | WARN_ON_ONCE(!io_op_defs[req->opcode].async_size); |
3656 | req->async_data = kmalloc(io_op_defs[req->opcode].async_size, GFP_KERNEL); | |
d886e185 PB |
3657 | if (req->async_data) { |
3658 | req->flags |= REQ_F_ASYNC_DATA; | |
3659 | return false; | |
3660 | } | |
3661 | return true; | |
3d9932a8 XW |
3662 | } |
3663 | ||
ff6165b2 | 3664 | static int io_setup_async_rw(struct io_kiocb *req, const struct iovec *iovec, |
c88598a9 | 3665 | struct io_rw_state *s, bool force) |
b7bb4f7d | 3666 | { |
26f0505a | 3667 | if (!force && !io_op_defs[req->opcode].needs_async_setup) |
74566df3 | 3668 | return 0; |
d886e185 | 3669 | if (!req_has_async_data(req)) { |
cd658695 JA |
3670 | struct io_async_rw *iorw; |
3671 | ||
6cb78689 | 3672 | if (io_alloc_async_data(req)) { |
6bf985dc | 3673 | kfree(iovec); |
5d204bcf | 3674 | return -ENOMEM; |
6bf985dc | 3675 | } |
b7bb4f7d | 3676 | |
c88598a9 | 3677 | io_req_map_rw(req, iovec, s->fast_iov, &s->iter); |
cd658695 JA |
3678 | iorw = req->async_data; |
3679 | /* we've copied and mapped the iter, ensure state is saved */ | |
538941e2 | 3680 | iov_iter_save_state(&iorw->s.iter, &iorw->s.iter_state); |
5d204bcf | 3681 | } |
b7bb4f7d | 3682 | return 0; |
f67676d1 JA |
3683 | } |
3684 | ||
73debe68 | 3685 | static inline int io_rw_prep_async(struct io_kiocb *req, int rw) |
c3e330a4 | 3686 | { |
e8c2bc1f | 3687 | struct io_async_rw *iorw = req->async_data; |
5e49c973 | 3688 | struct iovec *iov; |
847595de | 3689 | int ret; |
c3e330a4 | 3690 | |
51aac424 | 3691 | /* submission path, ->uring_lock should already be taken */ |
3b44b371 | 3692 | ret = io_import_iovec(rw, req, &iov, &iorw->s, 0); |
c3e330a4 PB |
3693 | if (unlikely(ret < 0)) |
3694 | return ret; | |
3695 | ||
ab0b196c PB |
3696 | iorw->bytes_done = 0; |
3697 | iorw->free_iovec = iov; | |
3698 | if (iov) | |
3699 | req->flags |= REQ_F_NEED_CLEANUP; | |
c3e330a4 PB |
3700 | return 0; |
3701 | } | |
3702 | ||
c1dd91d1 | 3703 | /* |
ffdc8dab | 3704 | * This is our waitqueue callback handler, registered through __folio_lock_async() |
c1dd91d1 JA |
3705 | * when we initially tried to do the IO with the iocb armed our waitqueue. |
3706 | * This gets called when the page is unlocked, and we generally expect that to | |
3707 | * happen when the page IO is completed and the page is now uptodate. This will | |
3708 | * queue a task_work based retry of the operation, attempting to copy the data | |
3709 | * again. If the latter fails because the page was NOT uptodate, then we will | |
3710 | * do a thread based blocking retry of the operation. That's the unexpected | |
3711 | * slow path. | |
3712 | */ | |
bcf5a063 JA |
3713 | static int io_async_buf_func(struct wait_queue_entry *wait, unsigned mode, |
3714 | int sync, void *arg) | |
3715 | { | |
3716 | struct wait_page_queue *wpq; | |
3717 | struct io_kiocb *req = wait->private; | |
bcf5a063 | 3718 | struct wait_page_key *key = arg; |
bcf5a063 JA |
3719 | |
3720 | wpq = container_of(wait, struct wait_page_queue, wait); | |
3721 | ||
cdc8fcb4 LT |
3722 | if (!wake_page_match(wpq, key)) |
3723 | return 0; | |
3724 | ||
c8d317aa | 3725 | req->rw.kiocb.ki_flags &= ~IOCB_WAITQ; |
bcf5a063 | 3726 | list_del_init(&wait->entry); |
921b9054 | 3727 | io_req_task_queue(req); |
bcf5a063 JA |
3728 | return 1; |
3729 | } | |
3730 | ||
c1dd91d1 JA |
3731 | /* |
3732 | * This controls whether a given IO request should be armed for async page | |
3733 | * based retry. If we return false here, the request is handed to the async | |
3734 | * worker threads for retry. If we're doing buffered reads on a regular file, | |
3735 | * we prepare a private wait_page_queue entry and retry the operation. This | |
3736 | * will either succeed because the page is now uptodate and unlocked, or it | |
3737 | * will register a callback when the page is unlocked at IO completion. Through | |
3738 | * that callback, io_uring uses task_work to setup a retry of the operation. | |
3739 | * That retry will attempt the buffered read again. The retry will generally | |
3740 | * succeed, or in rare cases where it fails, we then fall back to using the | |
3741 | * async worker threads for a blocking retry. | |
3742 | */ | |
227c0c96 | 3743 | static bool io_rw_should_retry(struct io_kiocb *req) |
f67676d1 | 3744 | { |
e8c2bc1f JA |
3745 | struct io_async_rw *rw = req->async_data; |
3746 | struct wait_page_queue *wait = &rw->wpq; | |
bcf5a063 | 3747 | struct kiocb *kiocb = &req->rw.kiocb; |
f67676d1 | 3748 | |
bcf5a063 JA |
3749 | /* never retry for NOWAIT, we just complete with -EAGAIN */ |
3750 | if (req->flags & REQ_F_NOWAIT) | |
3751 | return false; | |
f67676d1 | 3752 | |
227c0c96 | 3753 | /* Only for buffered IO */ |
3b2a4439 | 3754 | if (kiocb->ki_flags & (IOCB_DIRECT | IOCB_HIPRI)) |
bcf5a063 | 3755 | return false; |
3b2a4439 | 3756 | |
bcf5a063 JA |
3757 | /* |
3758 | * just use poll if we can, and don't attempt if the fs doesn't | |
3759 | * support callback based unlocks | |
3760 | */ | |
3761 | if (file_can_poll(req->file) || !(req->file->f_mode & FMODE_BUF_RASYNC)) | |
3762 | return false; | |
f67676d1 | 3763 | |
3b2a4439 JA |
3764 | wait->wait.func = io_async_buf_func; |
3765 | wait->wait.private = req; | |
3766 | wait->wait.flags = 0; | |
3767 | INIT_LIST_HEAD(&wait->wait.entry); | |
3768 | kiocb->ki_flags |= IOCB_WAITQ; | |
c8d317aa | 3769 | kiocb->ki_flags &= ~IOCB_NOWAIT; |
3b2a4439 | 3770 | kiocb->ki_waitq = wait; |
3b2a4439 | 3771 | return true; |
bcf5a063 JA |
3772 | } |
3773 | ||
aeab9506 | 3774 | static inline int io_iter_do_read(struct io_kiocb *req, struct iov_iter *iter) |
bcf5a063 | 3775 | { |
607b6fb8 | 3776 | if (likely(req->file->f_op->read_iter)) |
bcf5a063 | 3777 | return call_read_iter(req->file, &req->rw.kiocb, iter); |
2dd2111d | 3778 | else if (req->file->f_op->read) |
4017eb91 | 3779 | return loop_rw_iter(READ, req, iter); |
2dd2111d GH |
3780 | else |
3781 | return -EINVAL; | |
f67676d1 JA |
3782 | } |
3783 | ||
7db30437 ML |
3784 | static bool need_read_all(struct io_kiocb *req) |
3785 | { | |
3786 | return req->flags & REQ_F_ISREG || | |
3787 | S_ISBLK(file_inode(req->file)->i_mode); | |
3788 | } | |
3789 | ||
584b0180 JA |
3790 | static int io_rw_init_file(struct io_kiocb *req, fmode_t mode) |
3791 | { | |
3792 | struct kiocb *kiocb = &req->rw.kiocb; | |
3793 | struct io_ring_ctx *ctx = req->ctx; | |
3794 | struct file *file = req->file; | |
3795 | int ret; | |
3796 | ||
3797 | if (unlikely(!file || !(file->f_mode & mode))) | |
3798 | return -EBADF; | |
3799 | ||
3800 | if (!io_req_ffs_set(req)) | |
3801 | req->flags |= io_file_get_flags(file) << REQ_F_SUPPORT_NOWAIT_BIT; | |
3802 | ||
3803 | kiocb->ki_flags = iocb_flags(file); | |
3804 | ret = kiocb_set_rw_flags(kiocb, req->rw.flags); | |
3805 | if (unlikely(ret)) | |
3806 | return ret; | |
3807 | ||
3808 | /* | |
3809 | * If the file is marked O_NONBLOCK, still allow retry for it if it | |
3810 | * supports async. Otherwise it's impossible to use O_NONBLOCK files | |
3811 | * reliably. If not, or it IOCB_NOWAIT is set, don't retry. | |
3812 | */ | |
3813 | if ((kiocb->ki_flags & IOCB_NOWAIT) || | |
3814 | ((file->f_flags & O_NONBLOCK) && !io_file_supports_nowait(req))) | |
3815 | req->flags |= REQ_F_NOWAIT; | |
3816 | ||
3817 | if (ctx->flags & IORING_SETUP_IOPOLL) { | |
3818 | if (!(kiocb->ki_flags & IOCB_DIRECT) || !file->f_op->iopoll) | |
3819 | return -EOPNOTSUPP; | |
3820 | ||
3821 | kiocb->ki_flags |= IOCB_HIPRI | IOCB_ALLOC_CACHE; | |
3822 | kiocb->ki_complete = io_complete_rw_iopoll; | |
3823 | req->iopoll_completed = 0; | |
3824 | } else { | |
3825 | if (kiocb->ki_flags & IOCB_HIPRI) | |
3826 | return -EINVAL; | |
3827 | kiocb->ki_complete = io_complete_rw; | |
3828 | } | |
3829 | ||
3830 | return 0; | |
3831 | } | |
3832 | ||
889fca73 | 3833 | static int io_read(struct io_kiocb *req, unsigned int issue_flags) |
2b188cc1 | 3834 | { |
607b6fb8 | 3835 | struct io_rw_state __s, *s = &__s; |
c88598a9 | 3836 | struct iovec *iovec; |
9adbd45d | 3837 | struct kiocb *kiocb = &req->rw.kiocb; |
45d189c6 | 3838 | bool force_nonblock = issue_flags & IO_URING_F_NONBLOCK; |
d886e185 | 3839 | struct io_async_rw *rw; |
cd658695 | 3840 | ssize_t ret, ret2; |
b4aec400 | 3841 | loff_t *ppos; |
ff6165b2 | 3842 | |
607b6fb8 PB |
3843 | if (!req_has_async_data(req)) { |
3844 | ret = io_import_iovec(READ, req, &iovec, s, issue_flags); | |
3845 | if (unlikely(ret < 0)) | |
3846 | return ret; | |
3847 | } else { | |
2be2eb02 JA |
3848 | /* |
3849 | * Safe and required to re-import if we're using provided | |
3850 | * buffers, as we dropped the selected one before retry. | |
3851 | */ | |
3852 | if (req->flags & REQ_F_BUFFER_SELECT) { | |
3853 | ret = io_import_iovec(READ, req, &iovec, s, issue_flags); | |
3854 | if (unlikely(ret < 0)) | |
3855 | return ret; | |
3856 | } | |
3857 | ||
d886e185 | 3858 | rw = req->async_data; |
c88598a9 | 3859 | s = &rw->s; |
cd658695 JA |
3860 | /* |
3861 | * We come here from an earlier attempt, restore our state to | |
3862 | * match in case it doesn't. It's cheap enough that we don't | |
3863 | * need to make this conditional. | |
3864 | */ | |
c88598a9 | 3865 | iov_iter_restore(&s->iter, &s->iter_state); |
2846c481 | 3866 | iovec = NULL; |
2846c481 | 3867 | } |
584b0180 | 3868 | ret = io_rw_init_file(req, FMODE_READ); |
323b190b JA |
3869 | if (unlikely(ret)) { |
3870 | kfree(iovec); | |
584b0180 | 3871 | return ret; |
323b190b | 3872 | } |
cef216fc | 3873 | req->cqe.res = iov_iter_count(&s->iter); |
2b188cc1 | 3874 | |
607b6fb8 PB |
3875 | if (force_nonblock) { |
3876 | /* If the file doesn't support async, just async punt */ | |
35645ac3 | 3877 | if (unlikely(!io_file_supports_nowait(req))) { |
607b6fb8 PB |
3878 | ret = io_setup_async_rw(req, iovec, s, true); |
3879 | return ret ?: -EAGAIN; | |
3880 | } | |
a88fc400 | 3881 | kiocb->ki_flags |= IOCB_NOWAIT; |
607b6fb8 PB |
3882 | } else { |
3883 | /* Ensure we clear previously set non-block flag */ | |
3884 | kiocb->ki_flags &= ~IOCB_NOWAIT; | |
6713e7a6 | 3885 | } |
9e645e11 | 3886 | |
b4aec400 | 3887 | ppos = io_kiocb_update_pos(req); |
d34e1e5b | 3888 | |
cef216fc | 3889 | ret = rw_verify_area(READ, req->file, ppos, req->cqe.res); |
5ea5dd45 PB |
3890 | if (unlikely(ret)) { |
3891 | kfree(iovec); | |
3892 | return ret; | |
3893 | } | |
2b188cc1 | 3894 | |
c88598a9 | 3895 | ret = io_iter_do_read(req, &s->iter); |
32960613 | 3896 | |
230d50d4 | 3897 | if (ret == -EAGAIN || (req->flags & REQ_F_REISSUE)) { |
6ad7f233 | 3898 | req->flags &= ~REQ_F_REISSUE; |
9af177ee JA |
3899 | /* if we can poll, just do that */ |
3900 | if (req->opcode == IORING_OP_READ && file_can_poll(req->file)) | |
3901 | return -EAGAIN; | |
eefdf30f JA |
3902 | /* IOPOLL retry should happen for io-wq threads */ |
3903 | if (!force_nonblock && !(req->ctx->flags & IORING_SETUP_IOPOLL)) | |
f91daf56 | 3904 | goto done; |
75c668cd PB |
3905 | /* no retry on NONBLOCK nor RWF_NOWAIT */ |
3906 | if (req->flags & REQ_F_NOWAIT) | |
355afaeb | 3907 | goto done; |
f38c7e3a | 3908 | ret = 0; |
230d50d4 JA |
3909 | } else if (ret == -EIOCBQUEUED) { |
3910 | goto out_free; | |
cef216fc | 3911 | } else if (ret == req->cqe.res || ret <= 0 || !force_nonblock || |
7db30437 | 3912 | (req->flags & REQ_F_NOWAIT) || !need_read_all(req)) { |
7335e3bf | 3913 | /* read all, failed, already did sync or don't want to retry */ |
00d23d51 | 3914 | goto done; |
227c0c96 JA |
3915 | } |
3916 | ||
cd658695 JA |
3917 | /* |
3918 | * Don't depend on the iter state matching what was consumed, or being | |
3919 | * untouched in case of error. Restore it and we'll advance it | |
3920 | * manually if we need to. | |
3921 | */ | |
c88598a9 | 3922 | iov_iter_restore(&s->iter, &s->iter_state); |
cd658695 | 3923 | |
c88598a9 | 3924 | ret2 = io_setup_async_rw(req, iovec, s, true); |
6bf985dc PB |
3925 | if (ret2) |
3926 | return ret2; | |
3927 | ||
fe1cdd55 | 3928 | iovec = NULL; |
e8c2bc1f | 3929 | rw = req->async_data; |
c88598a9 | 3930 | s = &rw->s; |
cd658695 JA |
3931 | /* |
3932 | * Now use our persistent iterator and state, if we aren't already. | |
3933 | * We've restored and mapped the iter to match. | |
3934 | */ | |
227c0c96 | 3935 | |
b23df91b | 3936 | do { |
cd658695 JA |
3937 | /* |
3938 | * We end up here because of a partial read, either from | |
3939 | * above or inside this loop. Advance the iter by the bytes | |
3940 | * that were consumed. | |
3941 | */ | |
c88598a9 PB |
3942 | iov_iter_advance(&s->iter, ret); |
3943 | if (!iov_iter_count(&s->iter)) | |
cd658695 | 3944 | break; |
b23df91b | 3945 | rw->bytes_done += ret; |
c88598a9 | 3946 | iov_iter_save_state(&s->iter, &s->iter_state); |
cd658695 | 3947 | |
b23df91b PB |
3948 | /* if we can retry, do so with the callbacks armed */ |
3949 | if (!io_rw_should_retry(req)) { | |
3950 | kiocb->ki_flags &= ~IOCB_WAITQ; | |
3951 | return -EAGAIN; | |
3952 | } | |
3953 | ||
3954 | /* | |
3955 | * Now retry read with the IOCB_WAITQ parts set in the iocb. If | |
3956 | * we get -EIOCBQUEUED, then we'll get a notification when the | |
3957 | * desired page gets unlocked. We can also get a partial read | |
3958 | * here, and if we do, then just retry at the new offset. | |
3959 | */ | |
c88598a9 | 3960 | ret = io_iter_do_read(req, &s->iter); |
b23df91b PB |
3961 | if (ret == -EIOCBQUEUED) |
3962 | return 0; | |
227c0c96 | 3963 | /* we got some bytes, but not all. retry. */ |
b5b0ecb7 | 3964 | kiocb->ki_flags &= ~IOCB_WAITQ; |
c88598a9 | 3965 | iov_iter_restore(&s->iter, &s->iter_state); |
cd658695 | 3966 | } while (ret > 0); |
227c0c96 | 3967 | done: |
2ea537ca | 3968 | kiocb_done(req, ret, issue_flags); |
fe1cdd55 PB |
3969 | out_free: |
3970 | /* it's faster to check here then delegate to kfree */ | |
3971 | if (iovec) | |
3972 | kfree(iovec); | |
5ea5dd45 | 3973 | return 0; |
2b188cc1 JA |
3974 | } |
3975 | ||
889fca73 | 3976 | static int io_write(struct io_kiocb *req, unsigned int issue_flags) |
2b188cc1 | 3977 | { |
607b6fb8 | 3978 | struct io_rw_state __s, *s = &__s; |
c88598a9 | 3979 | struct iovec *iovec; |
9adbd45d | 3980 | struct kiocb *kiocb = &req->rw.kiocb; |
45d189c6 | 3981 | bool force_nonblock = issue_flags & IO_URING_F_NONBLOCK; |
cd658695 | 3982 | ssize_t ret, ret2; |
b4aec400 | 3983 | loff_t *ppos; |
2b188cc1 | 3984 | |
607b6fb8 | 3985 | if (!req_has_async_data(req)) { |
5e49c973 PB |
3986 | ret = io_import_iovec(WRITE, req, &iovec, s, issue_flags); |
3987 | if (unlikely(ret < 0)) | |
2846c481 | 3988 | return ret; |
607b6fb8 PB |
3989 | } else { |
3990 | struct io_async_rw *rw = req->async_data; | |
3991 | ||
3992 | s = &rw->s; | |
3993 | iov_iter_restore(&s->iter, &s->iter_state); | |
2846c481 | 3994 | iovec = NULL; |
2846c481 | 3995 | } |
584b0180 | 3996 | ret = io_rw_init_file(req, FMODE_WRITE); |
323b190b JA |
3997 | if (unlikely(ret)) { |
3998 | kfree(iovec); | |
584b0180 | 3999 | return ret; |
323b190b | 4000 | } |
cef216fc | 4001 | req->cqe.res = iov_iter_count(&s->iter); |
2b188cc1 | 4002 | |
607b6fb8 PB |
4003 | if (force_nonblock) { |
4004 | /* If the file doesn't support async, just async punt */ | |
35645ac3 | 4005 | if (unlikely(!io_file_supports_nowait(req))) |
607b6fb8 | 4006 | goto copy_iov; |
fd6c2e4c | 4007 | |
607b6fb8 PB |
4008 | /* file path doesn't support NOWAIT for non-direct_IO */ |
4009 | if (force_nonblock && !(kiocb->ki_flags & IOCB_DIRECT) && | |
4010 | (req->flags & REQ_F_ISREG)) | |
4011 | goto copy_iov; | |
31b51510 | 4012 | |
607b6fb8 PB |
4013 | kiocb->ki_flags |= IOCB_NOWAIT; |
4014 | } else { | |
4015 | /* Ensure we clear previously set non-block flag */ | |
4016 | kiocb->ki_flags &= ~IOCB_NOWAIT; | |
4017 | } | |
31b51510 | 4018 | |
b4aec400 | 4019 | ppos = io_kiocb_update_pos(req); |
d34e1e5b | 4020 | |
cef216fc | 4021 | ret = rw_verify_area(WRITE, req->file, ppos, req->cqe.res); |
fa15bafb PB |
4022 | if (unlikely(ret)) |
4023 | goto out_free; | |
4ed734b0 | 4024 | |
fa15bafb PB |
4025 | /* |
4026 | * Open-code file_start_write here to grab freeze protection, | |
4027 | * which will be released by another thread in | |
4028 | * io_complete_rw(). Fool lockdep by telling it the lock got | |
4029 | * released so that it doesn't complain about the held lock when | |
4030 | * we return to userspace. | |
4031 | */ | |
4032 | if (req->flags & REQ_F_ISREG) { | |
8a3c84b6 | 4033 | sb_start_write(file_inode(req->file)->i_sb); |
fa15bafb PB |
4034 | __sb_writers_release(file_inode(req->file)->i_sb, |
4035 | SB_FREEZE_WRITE); | |
4036 | } | |
4037 | kiocb->ki_flags |= IOCB_WRITE; | |
4ed734b0 | 4038 | |
35645ac3 | 4039 | if (likely(req->file->f_op->write_iter)) |
c88598a9 | 4040 | ret2 = call_write_iter(req->file, kiocb, &s->iter); |
2dd2111d | 4041 | else if (req->file->f_op->write) |
c88598a9 | 4042 | ret2 = loop_rw_iter(WRITE, req, &s->iter); |
2dd2111d GH |
4043 | else |
4044 | ret2 = -EINVAL; | |
4ed734b0 | 4045 | |
6ad7f233 PB |
4046 | if (req->flags & REQ_F_REISSUE) { |
4047 | req->flags &= ~REQ_F_REISSUE; | |
230d50d4 | 4048 | ret2 = -EAGAIN; |
6ad7f233 | 4049 | } |
230d50d4 | 4050 | |
fa15bafb PB |
4051 | /* |
4052 | * Raw bdev writes will return -EOPNOTSUPP for IOCB_NOWAIT. Just | |
4053 | * retry them without IOCB_NOWAIT. | |
4054 | */ | |
4055 | if (ret2 == -EOPNOTSUPP && (kiocb->ki_flags & IOCB_NOWAIT)) | |
4056 | ret2 = -EAGAIN; | |
75c668cd PB |
4057 | /* no retry on NONBLOCK nor RWF_NOWAIT */ |
4058 | if (ret2 == -EAGAIN && (req->flags & REQ_F_NOWAIT)) | |
355afaeb | 4059 | goto done; |
fa15bafb | 4060 | if (!force_nonblock || ret2 != -EAGAIN) { |
eefdf30f | 4061 | /* IOPOLL retry should happen for io-wq threads */ |
b10841c9 | 4062 | if (ret2 == -EAGAIN && (req->ctx->flags & IORING_SETUP_IOPOLL)) |
eefdf30f | 4063 | goto copy_iov; |
355afaeb | 4064 | done: |
2ea537ca | 4065 | kiocb_done(req, ret2, issue_flags); |
fa15bafb | 4066 | } else { |
f67676d1 | 4067 | copy_iov: |
c88598a9 PB |
4068 | iov_iter_restore(&s->iter, &s->iter_state); |
4069 | ret = io_setup_async_rw(req, iovec, s, false); | |
6bf985dc | 4070 | return ret ?: -EAGAIN; |
2b188cc1 | 4071 | } |
31b51510 | 4072 | out_free: |
f261c168 | 4073 | /* it's reportedly faster than delegating the null check to kfree() */ |
252917c3 | 4074 | if (iovec) |
6f2cc166 | 4075 | kfree(iovec); |
2b188cc1 JA |
4076 | return ret; |
4077 | } | |
4078 | ||
80a261fd JA |
4079 | static int io_renameat_prep(struct io_kiocb *req, |
4080 | const struct io_uring_sqe *sqe) | |
4081 | { | |
4082 | struct io_rename *ren = &req->rename; | |
4083 | const char __user *oldf, *newf; | |
4084 | ||
ed7eb259 JA |
4085 | if (unlikely(req->ctx->flags & IORING_SETUP_IOPOLL)) |
4086 | return -EINVAL; | |
26578cda | 4087 | if (sqe->ioprio || sqe->buf_index || sqe->splice_fd_in) |
ed7eb259 | 4088 | return -EINVAL; |
80a261fd JA |
4089 | if (unlikely(req->flags & REQ_F_FIXED_FILE)) |
4090 | return -EBADF; | |
4091 | ||
4092 | ren->old_dfd = READ_ONCE(sqe->fd); | |
4093 | oldf = u64_to_user_ptr(READ_ONCE(sqe->addr)); | |
4094 | newf = u64_to_user_ptr(READ_ONCE(sqe->addr2)); | |
4095 | ren->new_dfd = READ_ONCE(sqe->len); | |
4096 | ren->flags = READ_ONCE(sqe->rename_flags); | |
4097 | ||
4098 | ren->oldpath = getname(oldf); | |
4099 | if (IS_ERR(ren->oldpath)) | |
4100 | return PTR_ERR(ren->oldpath); | |
4101 | ||
4102 | ren->newpath = getname(newf); | |
4103 | if (IS_ERR(ren->newpath)) { | |
4104 | putname(ren->oldpath); | |
4105 | return PTR_ERR(ren->newpath); | |
4106 | } | |
4107 | ||
4108 | req->flags |= REQ_F_NEED_CLEANUP; | |
4109 | return 0; | |
4110 | } | |
4111 | ||
45d189c6 | 4112 | static int io_renameat(struct io_kiocb *req, unsigned int issue_flags) |
80a261fd JA |
4113 | { |
4114 | struct io_rename *ren = &req->rename; | |
4115 | int ret; | |
4116 | ||
45d189c6 | 4117 | if (issue_flags & IO_URING_F_NONBLOCK) |
80a261fd JA |
4118 | return -EAGAIN; |
4119 | ||
4120 | ret = do_renameat2(ren->old_dfd, ren->oldpath, ren->new_dfd, | |
4121 | ren->newpath, ren->flags); | |
4122 | ||
4123 | req->flags &= ~REQ_F_NEED_CLEANUP; | |
4124 | if (ret < 0) | |
93d2bcd2 | 4125 | req_set_fail(req); |
80a261fd JA |
4126 | io_req_complete(req, ret); |
4127 | return 0; | |
4128 | } | |
4129 | ||
14a1143b JA |
4130 | static int io_unlinkat_prep(struct io_kiocb *req, |
4131 | const struct io_uring_sqe *sqe) | |
4132 | { | |
4133 | struct io_unlink *un = &req->unlink; | |
4134 | const char __user *fname; | |
4135 | ||
22634bc5 JA |
4136 | if (unlikely(req->ctx->flags & IORING_SETUP_IOPOLL)) |
4137 | return -EINVAL; | |
26578cda PB |
4138 | if (sqe->ioprio || sqe->off || sqe->len || sqe->buf_index || |
4139 | sqe->splice_fd_in) | |
22634bc5 | 4140 | return -EINVAL; |
14a1143b JA |
4141 | if (unlikely(req->flags & REQ_F_FIXED_FILE)) |
4142 | return -EBADF; | |
4143 | ||
4144 | un->dfd = READ_ONCE(sqe->fd); | |
4145 | ||
4146 | un->flags = READ_ONCE(sqe->unlink_flags); | |
4147 | if (un->flags & ~AT_REMOVEDIR) | |
4148 | return -EINVAL; | |
4149 | ||
4150 | fname = u64_to_user_ptr(READ_ONCE(sqe->addr)); | |
4151 | un->filename = getname(fname); | |
4152 | if (IS_ERR(un->filename)) | |
4153 | return PTR_ERR(un->filename); | |
4154 | ||
4155 | req->flags |= REQ_F_NEED_CLEANUP; | |
4156 | return 0; | |
4157 | } | |
4158 | ||
45d189c6 | 4159 | static int io_unlinkat(struct io_kiocb *req, unsigned int issue_flags) |
14a1143b JA |
4160 | { |
4161 | struct io_unlink *un = &req->unlink; | |
4162 | int ret; | |
4163 | ||
45d189c6 | 4164 | if (issue_flags & IO_URING_F_NONBLOCK) |
14a1143b JA |
4165 | return -EAGAIN; |
4166 | ||
4167 | if (un->flags & AT_REMOVEDIR) | |
4168 | ret = do_rmdir(un->dfd, un->filename); | |
4169 | else | |
4170 | ret = do_unlinkat(un->dfd, un->filename); | |
4171 | ||
4172 | req->flags &= ~REQ_F_NEED_CLEANUP; | |
4173 | if (ret < 0) | |
93d2bcd2 | 4174 | req_set_fail(req); |
14a1143b JA |
4175 | io_req_complete(req, ret); |
4176 | return 0; | |
4177 | } | |
4178 | ||
e34a02dc DK |
4179 | static int io_mkdirat_prep(struct io_kiocb *req, |
4180 | const struct io_uring_sqe *sqe) | |
4181 | { | |
4182 | struct io_mkdir *mkd = &req->mkdir; | |
4183 | const char __user *fname; | |
4184 | ||
4185 | if (unlikely(req->ctx->flags & IORING_SETUP_IOPOLL)) | |
4186 | return -EINVAL; | |
4187 | if (sqe->ioprio || sqe->off || sqe->rw_flags || sqe->buf_index || | |
4188 | sqe->splice_fd_in) | |
4189 | return -EINVAL; | |
4190 | if (unlikely(req->flags & REQ_F_FIXED_FILE)) | |
4191 | return -EBADF; | |
4192 | ||
4193 | mkd->dfd = READ_ONCE(sqe->fd); | |
4194 | mkd->mode = READ_ONCE(sqe->len); | |
4195 | ||
4196 | fname = u64_to_user_ptr(READ_ONCE(sqe->addr)); | |
4197 | mkd->filename = getname(fname); | |
4198 | if (IS_ERR(mkd->filename)) | |
4199 | return PTR_ERR(mkd->filename); | |
4200 | ||
4201 | req->flags |= REQ_F_NEED_CLEANUP; | |
4202 | return 0; | |
4203 | } | |
4204 | ||
04f34081 | 4205 | static int io_mkdirat(struct io_kiocb *req, unsigned int issue_flags) |
e34a02dc DK |
4206 | { |
4207 | struct io_mkdir *mkd = &req->mkdir; | |
4208 | int ret; | |
4209 | ||
4210 | if (issue_flags & IO_URING_F_NONBLOCK) | |
4211 | return -EAGAIN; | |
4212 | ||
4213 | ret = do_mkdirat(mkd->dfd, mkd->filename, mkd->mode); | |
4214 | ||
4215 | req->flags &= ~REQ_F_NEED_CLEANUP; | |
4216 | if (ret < 0) | |
4217 | req_set_fail(req); | |
4218 | io_req_complete(req, ret); | |
4219 | return 0; | |
4220 | } | |
4221 | ||
7a8721f8 DK |
4222 | static int io_symlinkat_prep(struct io_kiocb *req, |
4223 | const struct io_uring_sqe *sqe) | |
4224 | { | |
4225 | struct io_symlink *sl = &req->symlink; | |
4226 | const char __user *oldpath, *newpath; | |
4227 | ||
4228 | if (unlikely(req->ctx->flags & IORING_SETUP_IOPOLL)) | |
4229 | return -EINVAL; | |
4230 | if (sqe->ioprio || sqe->len || sqe->rw_flags || sqe->buf_index || | |
4231 | sqe->splice_fd_in) | |
4232 | return -EINVAL; | |
4233 | if (unlikely(req->flags & REQ_F_FIXED_FILE)) | |
4234 | return -EBADF; | |
4235 | ||
4236 | sl->new_dfd = READ_ONCE(sqe->fd); | |
4237 | oldpath = u64_to_user_ptr(READ_ONCE(sqe->addr)); | |
4238 | newpath = u64_to_user_ptr(READ_ONCE(sqe->addr2)); | |
4239 | ||
4240 | sl->oldpath = getname(oldpath); | |
4241 | if (IS_ERR(sl->oldpath)) | |
4242 | return PTR_ERR(sl->oldpath); | |
4243 | ||
4244 | sl->newpath = getname(newpath); | |
4245 | if (IS_ERR(sl->newpath)) { | |
4246 | putname(sl->oldpath); | |
4247 | return PTR_ERR(sl->newpath); | |
4248 | } | |
4249 | ||
4250 | req->flags |= REQ_F_NEED_CLEANUP; | |
4251 | return 0; | |
4252 | } | |
4253 | ||
04f34081 | 4254 | static int io_symlinkat(struct io_kiocb *req, unsigned int issue_flags) |
7a8721f8 DK |
4255 | { |
4256 | struct io_symlink *sl = &req->symlink; | |
4257 | int ret; | |
4258 | ||
4259 | if (issue_flags & IO_URING_F_NONBLOCK) | |
4260 | return -EAGAIN; | |
4261 | ||
4262 | ret = do_symlinkat(sl->oldpath, sl->new_dfd, sl->newpath); | |
4263 | ||
4264 | req->flags &= ~REQ_F_NEED_CLEANUP; | |
4265 | if (ret < 0) | |
4266 | req_set_fail(req); | |
4267 | io_req_complete(req, ret); | |
4268 | return 0; | |
4269 | } | |
4270 | ||
cf30da90 DK |
4271 | static int io_linkat_prep(struct io_kiocb *req, |
4272 | const struct io_uring_sqe *sqe) | |
4273 | { | |
4274 | struct io_hardlink *lnk = &req->hardlink; | |
4275 | const char __user *oldf, *newf; | |
4276 | ||
4277 | if (unlikely(req->ctx->flags & IORING_SETUP_IOPOLL)) | |
4278 | return -EINVAL; | |
4279 | if (sqe->ioprio || sqe->rw_flags || sqe->buf_index || sqe->splice_fd_in) | |
4280 | return -EINVAL; | |
4281 | if (unlikely(req->flags & REQ_F_FIXED_FILE)) | |
4282 | return -EBADF; | |
4283 | ||
4284 | lnk->old_dfd = READ_ONCE(sqe->fd); | |
4285 | lnk->new_dfd = READ_ONCE(sqe->len); | |
4286 | oldf = u64_to_user_ptr(READ_ONCE(sqe->addr)); | |
4287 | newf = u64_to_user_ptr(READ_ONCE(sqe->addr2)); | |
4288 | lnk->flags = READ_ONCE(sqe->hardlink_flags); | |
4289 | ||
4290 | lnk->oldpath = getname(oldf); | |
4291 | if (IS_ERR(lnk->oldpath)) | |
4292 | return PTR_ERR(lnk->oldpath); | |
4293 | ||
4294 | lnk->newpath = getname(newf); | |
4295 | if (IS_ERR(lnk->newpath)) { | |
4296 | putname(lnk->oldpath); | |
4297 | return PTR_ERR(lnk->newpath); | |
4298 | } | |
4299 | ||
4300 | req->flags |= REQ_F_NEED_CLEANUP; | |
4301 | return 0; | |
4302 | } | |
4303 | ||
04f34081 | 4304 | static int io_linkat(struct io_kiocb *req, unsigned int issue_flags) |
cf30da90 DK |
4305 | { |
4306 | struct io_hardlink *lnk = &req->hardlink; | |
4307 | int ret; | |
4308 | ||
4309 | if (issue_flags & IO_URING_F_NONBLOCK) | |
4310 | return -EAGAIN; | |
4311 | ||
4312 | ret = do_linkat(lnk->old_dfd, lnk->oldpath, lnk->new_dfd, | |
4313 | lnk->newpath, lnk->flags); | |
4314 | ||
4315 | req->flags &= ~REQ_F_NEED_CLEANUP; | |
4316 | if (ret < 0) | |
4317 | req_set_fail(req); | |
4318 | io_req_complete(req, ret); | |
4319 | return 0; | |
4320 | } | |
4321 | ||
36f4fa68 JA |
4322 | static int io_shutdown_prep(struct io_kiocb *req, |
4323 | const struct io_uring_sqe *sqe) | |
4324 | { | |
4325 | #if defined(CONFIG_NET) | |
4326 | if (unlikely(req->ctx->flags & IORING_SETUP_IOPOLL)) | |
4327 | return -EINVAL; | |
26578cda PB |
4328 | if (unlikely(sqe->ioprio || sqe->off || sqe->addr || sqe->rw_flags || |
4329 | sqe->buf_index || sqe->splice_fd_in)) | |
36f4fa68 JA |
4330 | return -EINVAL; |
4331 | ||
4332 | req->shutdown.how = READ_ONCE(sqe->len); | |
4333 | return 0; | |
4334 | #else | |
4335 | return -EOPNOTSUPP; | |
4336 | #endif | |
4337 | } | |
4338 | ||
45d189c6 | 4339 | static int io_shutdown(struct io_kiocb *req, unsigned int issue_flags) |
36f4fa68 JA |
4340 | { |
4341 | #if defined(CONFIG_NET) | |
4342 | struct socket *sock; | |
4343 | int ret; | |
4344 | ||
45d189c6 | 4345 | if (issue_flags & IO_URING_F_NONBLOCK) |
36f4fa68 JA |
4346 | return -EAGAIN; |
4347 | ||
48aba79b | 4348 | sock = sock_from_file(req->file); |
36f4fa68 | 4349 | if (unlikely(!sock)) |
48aba79b | 4350 | return -ENOTSOCK; |
36f4fa68 JA |
4351 | |
4352 | ret = __sys_shutdown_sock(sock, req->shutdown.how); | |
a146468d | 4353 | if (ret < 0) |
93d2bcd2 | 4354 | req_set_fail(req); |
36f4fa68 JA |
4355 | io_req_complete(req, ret); |
4356 | return 0; | |
4357 | #else | |
4358 | return -EOPNOTSUPP; | |
4359 | #endif | |
4360 | } | |
4361 | ||
f2a8d5c7 PB |
4362 | static int __io_splice_prep(struct io_kiocb *req, |
4363 | const struct io_uring_sqe *sqe) | |
7d67af2c | 4364 | { |
fe7e3257 | 4365 | struct io_splice *sp = &req->splice; |
7d67af2c | 4366 | unsigned int valid_flags = SPLICE_F_FD_IN_FIXED | SPLICE_F_ALL; |
7d67af2c | 4367 | |
3232dd02 PB |
4368 | if (unlikely(req->ctx->flags & IORING_SETUP_IOPOLL)) |
4369 | return -EINVAL; | |
7d67af2c | 4370 | |
7d67af2c PB |
4371 | sp->len = READ_ONCE(sqe->len); |
4372 | sp->flags = READ_ONCE(sqe->splice_flags); | |
7d67af2c PB |
4373 | if (unlikely(sp->flags & ~valid_flags)) |
4374 | return -EINVAL; | |
a3e4bc23 | 4375 | sp->splice_fd_in = READ_ONCE(sqe->splice_fd_in); |
7d67af2c PB |
4376 | return 0; |
4377 | } | |
4378 | ||
f2a8d5c7 PB |
4379 | static int io_tee_prep(struct io_kiocb *req, |
4380 | const struct io_uring_sqe *sqe) | |
4381 | { | |
4382 | if (READ_ONCE(sqe->splice_off_in) || READ_ONCE(sqe->off)) | |
4383 | return -EINVAL; | |
4384 | return __io_splice_prep(req, sqe); | |
4385 | } | |
4386 | ||
45d189c6 | 4387 | static int io_tee(struct io_kiocb *req, unsigned int issue_flags) |
f2a8d5c7 PB |
4388 | { |
4389 | struct io_splice *sp = &req->splice; | |
f2a8d5c7 PB |
4390 | struct file *out = sp->file_out; |
4391 | unsigned int flags = sp->flags & ~SPLICE_F_FD_IN_FIXED; | |
a3e4bc23 | 4392 | struct file *in; |
f2a8d5c7 PB |
4393 | long ret = 0; |
4394 | ||
45d189c6 | 4395 | if (issue_flags & IO_URING_F_NONBLOCK) |
f2a8d5c7 | 4396 | return -EAGAIN; |
a3e4bc23 | 4397 | |
5106dd6e | 4398 | if (sp->flags & SPLICE_F_FD_IN_FIXED) |
e9419766 | 4399 | in = io_file_get_fixed(req, sp->splice_fd_in, issue_flags); |
5106dd6e JA |
4400 | else |
4401 | in = io_file_get_normal(req, sp->splice_fd_in); | |
a3e4bc23 JA |
4402 | if (!in) { |
4403 | ret = -EBADF; | |
4404 | goto done; | |
4405 | } | |
4406 | ||
f2a8d5c7 PB |
4407 | if (sp->len) |
4408 | ret = do_tee(in, out, sp->len, flags); | |
4409 | ||
e1d767f0 PB |
4410 | if (!(sp->flags & SPLICE_F_FD_IN_FIXED)) |
4411 | io_put_file(in); | |
a3e4bc23 | 4412 | done: |
f2a8d5c7 | 4413 | if (ret != sp->len) |
93d2bcd2 | 4414 | req_set_fail(req); |
e1e16097 | 4415 | io_req_complete(req, ret); |
f2a8d5c7 PB |
4416 | return 0; |
4417 | } | |
4418 | ||
4419 | static int io_splice_prep(struct io_kiocb *req, const struct io_uring_sqe *sqe) | |
4420 | { | |
fe7e3257 | 4421 | struct io_splice *sp = &req->splice; |
f2a8d5c7 PB |
4422 | |
4423 | sp->off_in = READ_ONCE(sqe->splice_off_in); | |
4424 | sp->off_out = READ_ONCE(sqe->off); | |
4425 | return __io_splice_prep(req, sqe); | |
4426 | } | |
4427 | ||
45d189c6 | 4428 | static int io_splice(struct io_kiocb *req, unsigned int issue_flags) |
7d67af2c PB |
4429 | { |
4430 | struct io_splice *sp = &req->splice; | |
7d67af2c PB |
4431 | struct file *out = sp->file_out; |
4432 | unsigned int flags = sp->flags & ~SPLICE_F_FD_IN_FIXED; | |
4433 | loff_t *poff_in, *poff_out; | |
a3e4bc23 | 4434 | struct file *in; |
c9687426 | 4435 | long ret = 0; |
7d67af2c | 4436 | |
45d189c6 | 4437 | if (issue_flags & IO_URING_F_NONBLOCK) |
2fb3e822 | 4438 | return -EAGAIN; |
7d67af2c | 4439 | |
5106dd6e | 4440 | if (sp->flags & SPLICE_F_FD_IN_FIXED) |
e9419766 | 4441 | in = io_file_get_fixed(req, sp->splice_fd_in, issue_flags); |
5106dd6e JA |
4442 | else |
4443 | in = io_file_get_normal(req, sp->splice_fd_in); | |
a3e4bc23 JA |
4444 | if (!in) { |
4445 | ret = -EBADF; | |
4446 | goto done; | |
4447 | } | |
4448 | ||
7d67af2c PB |
4449 | poff_in = (sp->off_in == -1) ? NULL : &sp->off_in; |
4450 | poff_out = (sp->off_out == -1) ? NULL : &sp->off_out; | |
c9687426 | 4451 | |
948a7749 | 4452 | if (sp->len) |
c9687426 | 4453 | ret = do_splice(in, poff_in, out, poff_out, sp->len, flags); |
7d67af2c | 4454 | |
e1d767f0 PB |
4455 | if (!(sp->flags & SPLICE_F_FD_IN_FIXED)) |
4456 | io_put_file(in); | |
a3e4bc23 | 4457 | done: |
7d67af2c | 4458 | if (ret != sp->len) |
93d2bcd2 | 4459 | req_set_fail(req); |
e1e16097 | 4460 | io_req_complete(req, ret); |
7d67af2c PB |
4461 | return 0; |
4462 | } | |
4463 | ||
2b188cc1 JA |
4464 | /* |
4465 | * IORING_OP_NOP just posts a completion event, nothing else. | |
4466 | */ | |
889fca73 | 4467 | static int io_nop(struct io_kiocb *req, unsigned int issue_flags) |
2b188cc1 JA |
4468 | { |
4469 | struct io_ring_ctx *ctx = req->ctx; | |
2b188cc1 | 4470 | |
def596e9 JA |
4471 | if (unlikely(ctx->flags & IORING_SETUP_IOPOLL)) |
4472 | return -EINVAL; | |
4473 | ||
889fca73 | 4474 | __io_req_complete(req, issue_flags, 0, 0); |
2b188cc1 JA |
4475 | return 0; |
4476 | } | |
4477 | ||
4f57f06c JA |
4478 | static int io_msg_ring_prep(struct io_kiocb *req, |
4479 | const struct io_uring_sqe *sqe) | |
4480 | { | |
f3b6a41e JA |
4481 | if (unlikely(sqe->addr || sqe->ioprio || sqe->rw_flags || |
4482 | sqe->splice_fd_in || sqe->buf_index || sqe->personality)) | |
4f57f06c JA |
4483 | return -EINVAL; |
4484 | ||
4f57f06c JA |
4485 | req->msg.user_data = READ_ONCE(sqe->off); |
4486 | req->msg.len = READ_ONCE(sqe->len); | |
4487 | return 0; | |
4488 | } | |
4489 | ||
4490 | static int io_msg_ring(struct io_kiocb *req, unsigned int issue_flags) | |
4491 | { | |
4492 | struct io_ring_ctx *target_ctx; | |
4493 | struct io_msg *msg = &req->msg; | |
4f57f06c | 4494 | bool filled; |
3f1d52ab | 4495 | int ret; |
4f57f06c | 4496 | |
3f1d52ab JA |
4497 | ret = -EBADFD; |
4498 | if (req->file->f_op != &io_uring_fops) | |
4499 | goto done; | |
4f57f06c | 4500 | |
3f1d52ab | 4501 | ret = -EOVERFLOW; |
4f57f06c JA |
4502 | target_ctx = req->file->private_data; |
4503 | ||
4504 | spin_lock(&target_ctx->completion_lock); | |
7ef66d18 | 4505 | filled = io_fill_cqe_aux(target_ctx, msg->user_data, msg->len, 0); |
4f57f06c JA |
4506 | io_commit_cqring(target_ctx); |
4507 | spin_unlock(&target_ctx->completion_lock); | |
4508 | ||
4509 | if (filled) { | |
4510 | io_cqring_ev_posted(target_ctx); | |
4511 | ret = 0; | |
4512 | } | |
4513 | ||
3f1d52ab | 4514 | done: |
9666d420 JA |
4515 | if (ret < 0) |
4516 | req_set_fail(req); | |
4f57f06c JA |
4517 | __io_req_complete(req, issue_flags, ret, 0); |
4518 | return 0; | |
4519 | } | |
4520 | ||
1155c76a | 4521 | static int io_fsync_prep(struct io_kiocb *req, const struct io_uring_sqe *sqe) |
c992fe29 | 4522 | { |
6b06314c | 4523 | struct io_ring_ctx *ctx = req->ctx; |
c992fe29 | 4524 | |
6b06314c | 4525 | if (unlikely(ctx->flags & IORING_SETUP_IOPOLL)) |
def596e9 | 4526 | return -EINVAL; |
26578cda PB |
4527 | if (unlikely(sqe->addr || sqe->ioprio || sqe->buf_index || |
4528 | sqe->splice_fd_in)) | |
c992fe29 CH |
4529 | return -EINVAL; |
4530 | ||
8ed8d3c3 JA |
4531 | req->sync.flags = READ_ONCE(sqe->fsync_flags); |
4532 | if (unlikely(req->sync.flags & ~IORING_FSYNC_DATASYNC)) | |
4533 | return -EINVAL; | |
4534 | ||
4535 | req->sync.off = READ_ONCE(sqe->off); | |
4536 | req->sync.len = READ_ONCE(sqe->len); | |
c992fe29 CH |
4537 | return 0; |
4538 | } | |
4539 | ||
45d189c6 | 4540 | static int io_fsync(struct io_kiocb *req, unsigned int issue_flags) |
8ed8d3c3 | 4541 | { |
8ed8d3c3 | 4542 | loff_t end = req->sync.off + req->sync.len; |
8ed8d3c3 JA |
4543 | int ret; |
4544 | ||
ac45abc0 | 4545 | /* fsync always requires a blocking context */ |
45d189c6 | 4546 | if (issue_flags & IO_URING_F_NONBLOCK) |
ac45abc0 PB |
4547 | return -EAGAIN; |
4548 | ||
9adbd45d | 4549 | ret = vfs_fsync_range(req->file, req->sync.off, |
8ed8d3c3 JA |
4550 | end > 0 ? end : LLONG_MAX, |
4551 | req->sync.flags & IORING_FSYNC_DATASYNC); | |
4552 | if (ret < 0) | |
93d2bcd2 | 4553 | req_set_fail(req); |
e1e16097 | 4554 | io_req_complete(req, ret); |
c992fe29 CH |
4555 | return 0; |
4556 | } | |
4557 | ||
d63d1b5e JA |
4558 | static int io_fallocate_prep(struct io_kiocb *req, |
4559 | const struct io_uring_sqe *sqe) | |
4560 | { | |
26578cda PB |
4561 | if (sqe->ioprio || sqe->buf_index || sqe->rw_flags || |
4562 | sqe->splice_fd_in) | |
d63d1b5e | 4563 | return -EINVAL; |
3232dd02 PB |
4564 | if (unlikely(req->ctx->flags & IORING_SETUP_IOPOLL)) |
4565 | return -EINVAL; | |
d63d1b5e JA |
4566 | |
4567 | req->sync.off = READ_ONCE(sqe->off); | |
4568 | req->sync.len = READ_ONCE(sqe->addr); | |
4569 | req->sync.mode = READ_ONCE(sqe->len); | |
4570 | return 0; | |
4571 | } | |
4572 | ||
45d189c6 | 4573 | static int io_fallocate(struct io_kiocb *req, unsigned int issue_flags) |
5d17b4a4 | 4574 | { |
ac45abc0 PB |
4575 | int ret; |
4576 | ||
d63d1b5e | 4577 | /* fallocate always requiring blocking context */ |
45d189c6 | 4578 | if (issue_flags & IO_URING_F_NONBLOCK) |
5d17b4a4 | 4579 | return -EAGAIN; |
ac45abc0 PB |
4580 | ret = vfs_fallocate(req->file, req->sync.mode, req->sync.off, |
4581 | req->sync.len); | |
ac45abc0 | 4582 | if (ret < 0) |
93d2bcd2 | 4583 | req_set_fail(req); |
f63cf519 JA |
4584 | else |
4585 | fsnotify_modify(req->file); | |
e1e16097 | 4586 | io_req_complete(req, ret); |
5d17b4a4 JA |
4587 | return 0; |
4588 | } | |
4589 | ||
ec65fea5 | 4590 | static int __io_openat_prep(struct io_kiocb *req, const struct io_uring_sqe *sqe) |
b7bb4f7d | 4591 | { |
f8748881 | 4592 | const char __user *fname; |
15b71abe | 4593 | int ret; |
b7bb4f7d | 4594 | |
d3fddf6d PB |
4595 | if (unlikely(req->ctx->flags & IORING_SETUP_IOPOLL)) |
4596 | return -EINVAL; | |
b9445598 | 4597 | if (unlikely(sqe->ioprio || sqe->buf_index)) |
15b71abe | 4598 | return -EINVAL; |
ec65fea5 | 4599 | if (unlikely(req->flags & REQ_F_FIXED_FILE)) |
cf3040ca | 4600 | return -EBADF; |
03b1230c | 4601 | |
ec65fea5 PB |
4602 | /* open.how should be already initialised */ |
4603 | if (!(req->open.how.flags & O_PATH) && force_o_largefile()) | |
08a1d26e | 4604 | req->open.how.flags |= O_LARGEFILE; |
3529d8c2 | 4605 | |
25e72d10 PB |
4606 | req->open.dfd = READ_ONCE(sqe->fd); |
4607 | fname = u64_to_user_ptr(READ_ONCE(sqe->addr)); | |
f8748881 | 4608 | req->open.filename = getname(fname); |
15b71abe JA |
4609 | if (IS_ERR(req->open.filename)) { |
4610 | ret = PTR_ERR(req->open.filename); | |
4611 | req->open.filename = NULL; | |
4612 | return ret; | |
4613 | } | |
b9445598 PB |
4614 | |
4615 | req->open.file_slot = READ_ONCE(sqe->file_index); | |
4616 | if (req->open.file_slot && (req->open.how.flags & O_CLOEXEC)) | |
4617 | return -EINVAL; | |
4618 | ||
4022e7af | 4619 | req->open.nofile = rlimit(RLIMIT_NOFILE); |
8fef80bf | 4620 | req->flags |= REQ_F_NEED_CLEANUP; |
15b71abe | 4621 | return 0; |
03b1230c JA |
4622 | } |
4623 | ||
ec65fea5 PB |
4624 | static int io_openat_prep(struct io_kiocb *req, const struct io_uring_sqe *sqe) |
4625 | { | |
d3fddf6d PB |
4626 | u64 mode = READ_ONCE(sqe->len); |
4627 | u64 flags = READ_ONCE(sqe->open_flags); | |
ec65fea5 | 4628 | |
ec65fea5 PB |
4629 | req->open.how = build_open_how(flags, mode); |
4630 | return __io_openat_prep(req, sqe); | |
4631 | } | |
4632 | ||
cebdb986 | 4633 | static int io_openat2_prep(struct io_kiocb *req, const struct io_uring_sqe *sqe) |
aa1fa28f | 4634 | { |
cebdb986 | 4635 | struct open_how __user *how; |
cebdb986 | 4636 | size_t len; |
0fa03c62 JA |
4637 | int ret; |
4638 | ||
cebdb986 JA |
4639 | how = u64_to_user_ptr(READ_ONCE(sqe->addr2)); |
4640 | len = READ_ONCE(sqe->len); | |
cebdb986 JA |
4641 | if (len < OPEN_HOW_SIZE_VER0) |
4642 | return -EINVAL; | |
3529d8c2 | 4643 | |
cebdb986 JA |
4644 | ret = copy_struct_from_user(&req->open.how, sizeof(req->open.how), how, |
4645 | len); | |
4646 | if (ret) | |
4647 | return ret; | |
3529d8c2 | 4648 | |
ec65fea5 | 4649 | return __io_openat_prep(req, sqe); |
cebdb986 JA |
4650 | } |
4651 | ||
45d189c6 | 4652 | static int io_openat2(struct io_kiocb *req, unsigned int issue_flags) |
15b71abe JA |
4653 | { |
4654 | struct open_flags op; | |
15b71abe | 4655 | struct file *file; |
b9445598 PB |
4656 | bool resolve_nonblock, nonblock_set; |
4657 | bool fixed = !!req->open.file_slot; | |
15b71abe JA |
4658 | int ret; |
4659 | ||
cebdb986 | 4660 | ret = build_open_flags(&req->open.how, &op); |
15b71abe JA |
4661 | if (ret) |
4662 | goto err; | |
3a81fd02 JA |
4663 | nonblock_set = op.open_flag & O_NONBLOCK; |
4664 | resolve_nonblock = req->open.how.resolve & RESOLVE_CACHED; | |
45d189c6 | 4665 | if (issue_flags & IO_URING_F_NONBLOCK) { |
3a81fd02 JA |
4666 | /* |
4667 | * Don't bother trying for O_TRUNC, O_CREAT, or O_TMPFILE open, | |
4668 | * it'll always -EAGAIN | |
4669 | */ | |
4670 | if (req->open.how.flags & (O_TRUNC | O_CREAT | O_TMPFILE)) | |
4671 | return -EAGAIN; | |
4672 | op.lookup_flags |= LOOKUP_CACHED; | |
4673 | op.open_flag |= O_NONBLOCK; | |
4674 | } | |
15b71abe | 4675 | |
b9445598 PB |
4676 | if (!fixed) { |
4677 | ret = __get_unused_fd_flags(req->open.how.flags, req->open.nofile); | |
4678 | if (ret < 0) | |
4679 | goto err; | |
4680 | } | |
15b71abe JA |
4681 | |
4682 | file = do_filp_open(req->open.dfd, req->open.filename, &op); | |
12dcb58a | 4683 | if (IS_ERR(file)) { |
944d1444 | 4684 | /* |
12dcb58a PB |
4685 | * We could hang on to this 'fd' on retrying, but seems like |
4686 | * marginal gain for something that is now known to be a slower | |
4687 | * path. So just put it, and we'll get a new one when we retry. | |
944d1444 | 4688 | */ |
b9445598 PB |
4689 | if (!fixed) |
4690 | put_unused_fd(ret); | |
3a81fd02 | 4691 | |
15b71abe | 4692 | ret = PTR_ERR(file); |
12dcb58a PB |
4693 | /* only retry if RESOLVE_CACHED wasn't already set by application */ |
4694 | if (ret == -EAGAIN && | |
4695 | (!resolve_nonblock && (issue_flags & IO_URING_F_NONBLOCK))) | |
4696 | return -EAGAIN; | |
4697 | goto err; | |
15b71abe | 4698 | } |
12dcb58a PB |
4699 | |
4700 | if ((issue_flags & IO_URING_F_NONBLOCK) && !nonblock_set) | |
4701 | file->f_flags &= ~O_NONBLOCK; | |
4702 | fsnotify_open(file); | |
b9445598 PB |
4703 | |
4704 | if (!fixed) | |
4705 | fd_install(ret, file); | |
4706 | else | |
4707 | ret = io_install_fixed_file(req, file, issue_flags, | |
4708 | req->open.file_slot - 1); | |
15b71abe JA |
4709 | err: |
4710 | putname(req->open.filename); | |
8fef80bf | 4711 | req->flags &= ~REQ_F_NEED_CLEANUP; |
15b71abe | 4712 | if (ret < 0) |
93d2bcd2 | 4713 | req_set_fail(req); |
0bdf3398 | 4714 | __io_req_complete(req, issue_flags, ret, 0); |
15b71abe JA |
4715 | return 0; |
4716 | } | |
4717 | ||
45d189c6 | 4718 | static int io_openat(struct io_kiocb *req, unsigned int issue_flags) |
cebdb986 | 4719 | { |
e45cff58 | 4720 | return io_openat2(req, issue_flags); |
cebdb986 JA |
4721 | } |
4722 | ||
067524e9 JA |
4723 | static int io_remove_buffers_prep(struct io_kiocb *req, |
4724 | const struct io_uring_sqe *sqe) | |
4725 | { | |
4726 | struct io_provide_buf *p = &req->pbuf; | |
4727 | u64 tmp; | |
4728 | ||
26578cda PB |
4729 | if (sqe->ioprio || sqe->rw_flags || sqe->addr || sqe->len || sqe->off || |
4730 | sqe->splice_fd_in) | |
067524e9 JA |
4731 | return -EINVAL; |
4732 | ||
4733 | tmp = READ_ONCE(sqe->fd); | |
4734 | if (!tmp || tmp > USHRT_MAX) | |
4735 | return -EINVAL; | |
4736 | ||
4737 | memset(p, 0, sizeof(*p)); | |
4738 | p->nbufs = tmp; | |
4739 | p->bgid = READ_ONCE(sqe->buf_group); | |
4740 | return 0; | |
4741 | } | |
4742 | ||
dbc7d452 JA |
4743 | static int __io_remove_buffers(struct io_ring_ctx *ctx, |
4744 | struct io_buffer_list *bl, unsigned nbufs) | |
067524e9 JA |
4745 | { |
4746 | unsigned i = 0; | |
4747 | ||
4748 | /* shouldn't happen */ | |
4749 | if (!nbufs) | |
4750 | return 0; | |
4751 | ||
4752 | /* the head kbuf is the list itself */ | |
dbc7d452 | 4753 | while (!list_empty(&bl->buf_list)) { |
067524e9 JA |
4754 | struct io_buffer *nxt; |
4755 | ||
dbc7d452 | 4756 | nxt = list_first_entry(&bl->buf_list, struct io_buffer, list); |
067524e9 | 4757 | list_del(&nxt->list); |
067524e9 JA |
4758 | if (++i == nbufs) |
4759 | return i; | |
1d0254e6 | 4760 | cond_resched(); |
067524e9 JA |
4761 | } |
4762 | i++; | |
067524e9 JA |
4763 | |
4764 | return i; | |
4765 | } | |
4766 | ||
889fca73 | 4767 | static int io_remove_buffers(struct io_kiocb *req, unsigned int issue_flags) |
067524e9 JA |
4768 | { |
4769 | struct io_provide_buf *p = &req->pbuf; | |
4770 | struct io_ring_ctx *ctx = req->ctx; | |
dbc7d452 | 4771 | struct io_buffer_list *bl; |
067524e9 JA |
4772 | int ret = 0; |
4773 | ||
f8929630 | 4774 | io_ring_submit_lock(ctx, issue_flags); |
067524e9 JA |
4775 | |
4776 | ret = -ENOENT; | |
dbc7d452 JA |
4777 | bl = io_buffer_get_list(ctx, p->bgid); |
4778 | if (bl) | |
4779 | ret = __io_remove_buffers(ctx, bl, p->nbufs); | |
067524e9 | 4780 | if (ret < 0) |
93d2bcd2 | 4781 | req_set_fail(req); |
067524e9 | 4782 | |
9fb8cb49 PB |
4783 | /* complete before unlock, IOPOLL may need the lock */ |
4784 | __io_req_complete(req, issue_flags, ret, 0); | |
f8929630 | 4785 | io_ring_submit_unlock(ctx, issue_flags); |
067524e9 JA |
4786 | return 0; |
4787 | } | |
4788 | ||
ddf0322d JA |
4789 | static int io_provide_buffers_prep(struct io_kiocb *req, |
4790 | const struct io_uring_sqe *sqe) | |
4791 | { | |
38134ada | 4792 | unsigned long size, tmp_check; |
ddf0322d JA |
4793 | struct io_provide_buf *p = &req->pbuf; |
4794 | u64 tmp; | |
4795 | ||
26578cda | 4796 | if (sqe->ioprio || sqe->rw_flags || sqe->splice_fd_in) |
ddf0322d JA |
4797 | return -EINVAL; |
4798 | ||
4799 | tmp = READ_ONCE(sqe->fd); | |
4800 | if (!tmp || tmp > USHRT_MAX) | |
4801 | return -E2BIG; | |
4802 | p->nbufs = tmp; | |
4803 | p->addr = READ_ONCE(sqe->addr); | |
4804 | p->len = READ_ONCE(sqe->len); | |
4805 | ||
38134ada PB |
4806 | if (check_mul_overflow((unsigned long)p->len, (unsigned long)p->nbufs, |
4807 | &size)) | |
4808 | return -EOVERFLOW; | |
4809 | if (check_add_overflow((unsigned long)p->addr, size, &tmp_check)) | |
4810 | return -EOVERFLOW; | |
4811 | ||
d81269fe PB |
4812 | size = (unsigned long)p->len * p->nbufs; |
4813 | if (!access_ok(u64_to_user_ptr(p->addr), size)) | |
ddf0322d JA |
4814 | return -EFAULT; |
4815 | ||
4816 | p->bgid = READ_ONCE(sqe->buf_group); | |
4817 | tmp = READ_ONCE(sqe->off); | |
4818 | if (tmp > USHRT_MAX) | |
4819 | return -E2BIG; | |
4820 | p->bid = tmp; | |
4821 | return 0; | |
4822 | } | |
4823 | ||
cc3cec83 JA |
4824 | static int io_refill_buffer_cache(struct io_ring_ctx *ctx) |
4825 | { | |
4826 | struct io_buffer *buf; | |
4827 | struct page *page; | |
4828 | int bufs_in_page; | |
4829 | ||
4830 | /* | |
4831 | * Completions that don't happen inline (eg not under uring_lock) will | |
4832 | * add to ->io_buffers_comp. If we don't have any free buffers, check | |
4833 | * the completion list and splice those entries first. | |
4834 | */ | |
4835 | if (!list_empty_careful(&ctx->io_buffers_comp)) { | |
4836 | spin_lock(&ctx->completion_lock); | |
4837 | if (!list_empty(&ctx->io_buffers_comp)) { | |
4838 | list_splice_init(&ctx->io_buffers_comp, | |
4839 | &ctx->io_buffers_cache); | |
4840 | spin_unlock(&ctx->completion_lock); | |
4841 | return 0; | |
4842 | } | |
4843 | spin_unlock(&ctx->completion_lock); | |
4844 | } | |
4845 | ||
4846 | /* | |
4847 | * No free buffers and no completion entries either. Allocate a new | |
4848 | * page worth of buffer entries and add those to our freelist. | |
4849 | */ | |
4850 | page = alloc_page(GFP_KERNEL_ACCOUNT); | |
4851 | if (!page) | |
4852 | return -ENOMEM; | |
4853 | ||
4854 | list_add(&page->lru, &ctx->io_buffers_pages); | |
4855 | ||
4856 | buf = page_address(page); | |
4857 | bufs_in_page = PAGE_SIZE / sizeof(*buf); | |
4858 | while (bufs_in_page) { | |
4859 | list_add_tail(&buf->list, &ctx->io_buffers_cache); | |
4860 | buf++; | |
4861 | bufs_in_page--; | |
4862 | } | |
4863 | ||
4864 | return 0; | |
4865 | } | |
4866 | ||
4867 | static int io_add_buffers(struct io_ring_ctx *ctx, struct io_provide_buf *pbuf, | |
dbc7d452 | 4868 | struct io_buffer_list *bl) |
ddf0322d JA |
4869 | { |
4870 | struct io_buffer *buf; | |
4871 | u64 addr = pbuf->addr; | |
4872 | int i, bid = pbuf->bid; | |
4873 | ||
4874 | for (i = 0; i < pbuf->nbufs; i++) { | |
cc3cec83 JA |
4875 | if (list_empty(&ctx->io_buffers_cache) && |
4876 | io_refill_buffer_cache(ctx)) | |
ddf0322d | 4877 | break; |
cc3cec83 JA |
4878 | buf = list_first_entry(&ctx->io_buffers_cache, struct io_buffer, |
4879 | list); | |
dbc7d452 | 4880 | list_move_tail(&buf->list, &bl->buf_list); |
ddf0322d | 4881 | buf->addr = addr; |
d1f82808 | 4882 | buf->len = min_t(__u32, pbuf->len, MAX_RW_COUNT); |
ddf0322d | 4883 | buf->bid = bid; |
b1c62645 | 4884 | buf->bgid = pbuf->bgid; |
ddf0322d JA |
4885 | addr += pbuf->len; |
4886 | bid++; | |
f240762f | 4887 | cond_resched(); |
ddf0322d JA |
4888 | } |
4889 | ||
dbc7d452 | 4890 | return i ? 0 : -ENOMEM; |
ddf0322d JA |
4891 | } |
4892 | ||
889fca73 | 4893 | static int io_provide_buffers(struct io_kiocb *req, unsigned int issue_flags) |
ddf0322d JA |
4894 | { |
4895 | struct io_provide_buf *p = &req->pbuf; | |
4896 | struct io_ring_ctx *ctx = req->ctx; | |
dbc7d452 | 4897 | struct io_buffer_list *bl; |
ddf0322d | 4898 | int ret = 0; |
ddf0322d | 4899 | |
f8929630 | 4900 | io_ring_submit_lock(ctx, issue_flags); |
ddf0322d | 4901 | |
dbc7d452 JA |
4902 | bl = io_buffer_get_list(ctx, p->bgid); |
4903 | if (unlikely(!bl)) { | |
4904 | bl = kmalloc(sizeof(*bl), GFP_KERNEL); | |
4905 | if (!bl) { | |
4906 | ret = -ENOMEM; | |
4907 | goto err; | |
4908 | } | |
4909 | io_buffer_add_list(ctx, bl, p->bgid); | |
ddf0322d | 4910 | } |
dbc7d452 JA |
4911 | |
4912 | ret = io_add_buffers(ctx, p, bl); | |
4913 | err: | |
ddf0322d | 4914 | if (ret < 0) |
93d2bcd2 | 4915 | req_set_fail(req); |
9fb8cb49 PB |
4916 | /* complete before unlock, IOPOLL may need the lock */ |
4917 | __io_req_complete(req, issue_flags, ret, 0); | |
f8929630 | 4918 | io_ring_submit_unlock(ctx, issue_flags); |
ddf0322d | 4919 | return 0; |
cebdb986 JA |
4920 | } |
4921 | ||
3e4827b0 JA |
4922 | static int io_epoll_ctl_prep(struct io_kiocb *req, |
4923 | const struct io_uring_sqe *sqe) | |
4924 | { | |
4925 | #if defined(CONFIG_EPOLL) | |
26578cda | 4926 | if (sqe->ioprio || sqe->buf_index || sqe->splice_fd_in) |
3e4827b0 | 4927 | return -EINVAL; |
2d74d042 | 4928 | if (unlikely(req->ctx->flags & IORING_SETUP_IOPOLL)) |
3232dd02 | 4929 | return -EINVAL; |
3e4827b0 JA |
4930 | |
4931 | req->epoll.epfd = READ_ONCE(sqe->fd); | |
4932 | req->epoll.op = READ_ONCE(sqe->len); | |
4933 | req->epoll.fd = READ_ONCE(sqe->off); | |
4934 | ||
4935 | if (ep_op_has_event(req->epoll.op)) { | |
4936 | struct epoll_event __user *ev; | |
4937 | ||
4938 | ev = u64_to_user_ptr(READ_ONCE(sqe->addr)); | |
4939 | if (copy_from_user(&req->epoll.event, ev, sizeof(*ev))) | |
4940 | return -EFAULT; | |
4941 | } | |
4942 | ||
4943 | return 0; | |
4944 | #else | |
4945 | return -EOPNOTSUPP; | |
4946 | #endif | |
4947 | } | |
4948 | ||
889fca73 | 4949 | static int io_epoll_ctl(struct io_kiocb *req, unsigned int issue_flags) |
3e4827b0 JA |
4950 | { |
4951 | #if defined(CONFIG_EPOLL) | |
4952 | struct io_epoll *ie = &req->epoll; | |
4953 | int ret; | |
45d189c6 | 4954 | bool force_nonblock = issue_flags & IO_URING_F_NONBLOCK; |
3e4827b0 JA |
4955 | |
4956 | ret = do_epoll_ctl(ie->epfd, ie->op, ie->fd, &ie->event, force_nonblock); | |
4957 | if (force_nonblock && ret == -EAGAIN) | |
4958 | return -EAGAIN; | |
4959 | ||
4960 | if (ret < 0) | |
93d2bcd2 | 4961 | req_set_fail(req); |
889fca73 | 4962 | __io_req_complete(req, issue_flags, ret, 0); |
3e4827b0 JA |
4963 | return 0; |
4964 | #else | |
4965 | return -EOPNOTSUPP; | |
4966 | #endif | |
4967 | } | |
4968 | ||
c1ca757b JA |
4969 | static int io_madvise_prep(struct io_kiocb *req, const struct io_uring_sqe *sqe) |
4970 | { | |
4971 | #if defined(CONFIG_ADVISE_SYSCALLS) && defined(CONFIG_MMU) | |
26578cda | 4972 | if (sqe->ioprio || sqe->buf_index || sqe->off || sqe->splice_fd_in) |
c1ca757b | 4973 | return -EINVAL; |
3232dd02 PB |
4974 | if (unlikely(req->ctx->flags & IORING_SETUP_IOPOLL)) |
4975 | return -EINVAL; | |
c1ca757b JA |
4976 | |
4977 | req->madvise.addr = READ_ONCE(sqe->addr); | |
4978 | req->madvise.len = READ_ONCE(sqe->len); | |
4979 | req->madvise.advice = READ_ONCE(sqe->fadvise_advice); | |
4980 | return 0; | |
4981 | #else | |
4982 | return -EOPNOTSUPP; | |
4983 | #endif | |
4984 | } | |
4985 | ||
45d189c6 | 4986 | static int io_madvise(struct io_kiocb *req, unsigned int issue_flags) |
c1ca757b JA |
4987 | { |
4988 | #if defined(CONFIG_ADVISE_SYSCALLS) && defined(CONFIG_MMU) | |
4989 | struct io_madvise *ma = &req->madvise; | |
4990 | int ret; | |
4991 | ||
45d189c6 | 4992 | if (issue_flags & IO_URING_F_NONBLOCK) |
c1ca757b JA |
4993 | return -EAGAIN; |
4994 | ||
0726b01e | 4995 | ret = do_madvise(current->mm, ma->addr, ma->len, ma->advice); |
c1ca757b | 4996 | if (ret < 0) |
93d2bcd2 | 4997 | req_set_fail(req); |
e1e16097 | 4998 | io_req_complete(req, ret); |
c1ca757b JA |
4999 | return 0; |
5000 | #else | |
5001 | return -EOPNOTSUPP; | |
5002 | #endif | |
5003 | } | |
5004 | ||
4840e418 JA |
5005 | static int io_fadvise_prep(struct io_kiocb *req, const struct io_uring_sqe *sqe) |
5006 | { | |
26578cda | 5007 | if (sqe->ioprio || sqe->buf_index || sqe->addr || sqe->splice_fd_in) |
4840e418 | 5008 | return -EINVAL; |
3232dd02 PB |
5009 | if (unlikely(req->ctx->flags & IORING_SETUP_IOPOLL)) |
5010 | return -EINVAL; | |
4840e418 JA |
5011 | |
5012 | req->fadvise.offset = READ_ONCE(sqe->off); | |
5013 | req->fadvise.len = READ_ONCE(sqe->len); | |
5014 | req->fadvise.advice = READ_ONCE(sqe->fadvise_advice); | |
5015 | return 0; | |
5016 | } | |
5017 | ||
45d189c6 | 5018 | static int io_fadvise(struct io_kiocb *req, unsigned int issue_flags) |
4840e418 JA |
5019 | { |
5020 | struct io_fadvise *fa = &req->fadvise; | |
5021 | int ret; | |
5022 | ||
45d189c6 | 5023 | if (issue_flags & IO_URING_F_NONBLOCK) { |
3e69426d JA |
5024 | switch (fa->advice) { |
5025 | case POSIX_FADV_NORMAL: | |
5026 | case POSIX_FADV_RANDOM: | |
5027 | case POSIX_FADV_SEQUENTIAL: | |
5028 | break; | |
5029 | default: | |
5030 | return -EAGAIN; | |
5031 | } | |
5032 | } | |
4840e418 JA |
5033 | |
5034 | ret = vfs_fadvise(req->file, fa->offset, fa->len, fa->advice); | |
5035 | if (ret < 0) | |
93d2bcd2 | 5036 | req_set_fail(req); |
0bdf3398 | 5037 | __io_req_complete(req, issue_flags, ret, 0); |
4840e418 JA |
5038 | return 0; |
5039 | } | |
5040 | ||
eddc7ef5 JA |
5041 | static int io_statx_prep(struct io_kiocb *req, const struct io_uring_sqe *sqe) |
5042 | { | |
1b6fe6e0 SR |
5043 | const char __user *path; |
5044 | ||
2d74d042 | 5045 | if (unlikely(req->ctx->flags & IORING_SETUP_IOPOLL)) |
3232dd02 | 5046 | return -EINVAL; |
26578cda | 5047 | if (sqe->ioprio || sqe->buf_index || sqe->splice_fd_in) |
eddc7ef5 | 5048 | return -EINVAL; |
9c280f90 | 5049 | if (req->flags & REQ_F_FIXED_FILE) |
cf3040ca | 5050 | return -EBADF; |
eddc7ef5 | 5051 | |
1d9e1288 BM |
5052 | req->statx.dfd = READ_ONCE(sqe->fd); |
5053 | req->statx.mask = READ_ONCE(sqe->len); | |
1b6fe6e0 | 5054 | path = u64_to_user_ptr(READ_ONCE(sqe->addr)); |
1d9e1288 BM |
5055 | req->statx.buffer = u64_to_user_ptr(READ_ONCE(sqe->addr2)); |
5056 | req->statx.flags = READ_ONCE(sqe->statx_flags); | |
eddc7ef5 | 5057 | |
1b6fe6e0 SR |
5058 | req->statx.filename = getname_flags(path, |
5059 | getname_statx_lookup_flags(req->statx.flags), | |
5060 | NULL); | |
5061 | ||
5062 | if (IS_ERR(req->statx.filename)) { | |
5063 | int ret = PTR_ERR(req->statx.filename); | |
5064 | ||
5065 | req->statx.filename = NULL; | |
5066 | return ret; | |
5067 | } | |
5068 | ||
5069 | req->flags |= REQ_F_NEED_CLEANUP; | |
eddc7ef5 JA |
5070 | return 0; |
5071 | } | |
5072 | ||
45d189c6 | 5073 | static int io_statx(struct io_kiocb *req, unsigned int issue_flags) |
eddc7ef5 | 5074 | { |
1d9e1288 | 5075 | struct io_statx *ctx = &req->statx; |
eddc7ef5 JA |
5076 | int ret; |
5077 | ||
59d70013 | 5078 | if (issue_flags & IO_URING_F_NONBLOCK) |
eddc7ef5 JA |
5079 | return -EAGAIN; |
5080 | ||
e62753e4 BM |
5081 | ret = do_statx(ctx->dfd, ctx->filename, ctx->flags, ctx->mask, |
5082 | ctx->buffer); | |
eddc7ef5 | 5083 | |
eddc7ef5 | 5084 | if (ret < 0) |
93d2bcd2 | 5085 | req_set_fail(req); |
e1e16097 | 5086 | io_req_complete(req, ret); |
eddc7ef5 JA |
5087 | return 0; |
5088 | } | |
5089 | ||
b5dba59e JA |
5090 | static int io_close_prep(struct io_kiocb *req, const struct io_uring_sqe *sqe) |
5091 | { | |
14587a46 | 5092 | if (unlikely(req->ctx->flags & IORING_SETUP_IOPOLL)) |
3232dd02 | 5093 | return -EINVAL; |
b5dba59e | 5094 | if (sqe->ioprio || sqe->off || sqe->addr || sqe->len || |
7df778be | 5095 | sqe->rw_flags || sqe->buf_index) |
b5dba59e | 5096 | return -EINVAL; |
9c280f90 | 5097 | if (req->flags & REQ_F_FIXED_FILE) |
cf3040ca | 5098 | return -EBADF; |
b5dba59e JA |
5099 | |
5100 | req->close.fd = READ_ONCE(sqe->fd); | |
7df778be PB |
5101 | req->close.file_slot = READ_ONCE(sqe->file_index); |
5102 | if (req->close.file_slot && req->close.fd) | |
5103 | return -EINVAL; | |
5104 | ||
b5dba59e | 5105 | return 0; |
b5dba59e JA |
5106 | } |
5107 | ||
889fca73 | 5108 | static int io_close(struct io_kiocb *req, unsigned int issue_flags) |
b5dba59e | 5109 | { |
9eac1904 | 5110 | struct files_struct *files = current->files; |
3af73b28 | 5111 | struct io_close *close = &req->close; |
9eac1904 | 5112 | struct fdtable *fdt; |
a1fde923 PB |
5113 | struct file *file = NULL; |
5114 | int ret = -EBADF; | |
b5dba59e | 5115 | |
7df778be PB |
5116 | if (req->close.file_slot) { |
5117 | ret = io_close_fixed(req, issue_flags); | |
5118 | goto err; | |
5119 | } | |
5120 | ||
9eac1904 JA |
5121 | spin_lock(&files->file_lock); |
5122 | fdt = files_fdtable(files); | |
5123 | if (close->fd >= fdt->max_fds) { | |
5124 | spin_unlock(&files->file_lock); | |
5125 | goto err; | |
5126 | } | |
5127 | file = fdt->fd[close->fd]; | |
a1fde923 | 5128 | if (!file || file->f_op == &io_uring_fops) { |
9eac1904 JA |
5129 | spin_unlock(&files->file_lock); |
5130 | file = NULL; | |
5131 | goto err; | |
3af73b28 | 5132 | } |
b5dba59e JA |
5133 | |
5134 | /* if the file has a flush method, be safe and punt to async */ | |
45d189c6 | 5135 | if (file->f_op->flush && (issue_flags & IO_URING_F_NONBLOCK)) { |
9eac1904 | 5136 | spin_unlock(&files->file_lock); |
0bf0eefd | 5137 | return -EAGAIN; |
a2100672 | 5138 | } |
b5dba59e | 5139 | |
9eac1904 JA |
5140 | ret = __close_fd_get_file(close->fd, &file); |
5141 | spin_unlock(&files->file_lock); | |
5142 | if (ret < 0) { | |
5143 | if (ret == -ENOENT) | |
5144 | ret = -EBADF; | |
5145 | goto err; | |
5146 | } | |
5147 | ||
3af73b28 | 5148 | /* No ->flush() or already async, safely close from here */ |
9eac1904 JA |
5149 | ret = filp_close(file, current->files); |
5150 | err: | |
3af73b28 | 5151 | if (ret < 0) |
93d2bcd2 | 5152 | req_set_fail(req); |
9eac1904 JA |
5153 | if (file) |
5154 | fput(file); | |
889fca73 | 5155 | __io_req_complete(req, issue_flags, ret, 0); |
1a417f4e | 5156 | return 0; |
b5dba59e JA |
5157 | } |
5158 | ||
1155c76a | 5159 | static int io_sfr_prep(struct io_kiocb *req, const struct io_uring_sqe *sqe) |
5d17b4a4 JA |
5160 | { |
5161 | struct io_ring_ctx *ctx = req->ctx; | |
5d17b4a4 | 5162 | |
5d17b4a4 JA |
5163 | if (unlikely(ctx->flags & IORING_SETUP_IOPOLL)) |
5164 | return -EINVAL; | |
26578cda PB |
5165 | if (unlikely(sqe->addr || sqe->ioprio || sqe->buf_index || |
5166 | sqe->splice_fd_in)) | |
5d17b4a4 JA |
5167 | return -EINVAL; |
5168 | ||
8ed8d3c3 JA |
5169 | req->sync.off = READ_ONCE(sqe->off); |
5170 | req->sync.len = READ_ONCE(sqe->len); | |
5171 | req->sync.flags = READ_ONCE(sqe->sync_range_flags); | |
8ed8d3c3 JA |
5172 | return 0; |
5173 | } | |
5174 | ||
45d189c6 | 5175 | static int io_sync_file_range(struct io_kiocb *req, unsigned int issue_flags) |
8ed8d3c3 | 5176 | { |
8ed8d3c3 JA |
5177 | int ret; |
5178 | ||
ac45abc0 | 5179 | /* sync_file_range always requires a blocking context */ |
45d189c6 | 5180 | if (issue_flags & IO_URING_F_NONBLOCK) |
ac45abc0 PB |
5181 | return -EAGAIN; |
5182 | ||
9adbd45d | 5183 | ret = sync_file_range(req->file, req->sync.off, req->sync.len, |
8ed8d3c3 JA |
5184 | req->sync.flags); |
5185 | if (ret < 0) | |
93d2bcd2 | 5186 | req_set_fail(req); |
e1e16097 | 5187 | io_req_complete(req, ret); |
5d17b4a4 JA |
5188 | return 0; |
5189 | } | |
5190 | ||
469956e8 | 5191 | #if defined(CONFIG_NET) |
02d27d89 PB |
5192 | static int io_setup_async_msg(struct io_kiocb *req, |
5193 | struct io_async_msghdr *kmsg) | |
5194 | { | |
e8c2bc1f JA |
5195 | struct io_async_msghdr *async_msg = req->async_data; |
5196 | ||
5197 | if (async_msg) | |
02d27d89 | 5198 | return -EAGAIN; |
e8c2bc1f | 5199 | if (io_alloc_async_data(req)) { |
257e84a5 | 5200 | kfree(kmsg->free_iov); |
02d27d89 PB |
5201 | return -ENOMEM; |
5202 | } | |
e8c2bc1f | 5203 | async_msg = req->async_data; |
02d27d89 | 5204 | req->flags |= REQ_F_NEED_CLEANUP; |
e8c2bc1f | 5205 | memcpy(async_msg, kmsg, sizeof(*kmsg)); |
2a780802 | 5206 | async_msg->msg.msg_name = &async_msg->addr; |
257e84a5 PB |
5207 | /* if were using fast_iov, set it to the new one */ |
5208 | if (!async_msg->free_iov) | |
5209 | async_msg->msg.msg_iter.iov = async_msg->fast_iov; | |
5210 | ||
02d27d89 PB |
5211 | return -EAGAIN; |
5212 | } | |
5213 | ||
2ae523ed PB |
5214 | static int io_sendmsg_copy_hdr(struct io_kiocb *req, |
5215 | struct io_async_msghdr *iomsg) | |
5216 | { | |
2ae523ed | 5217 | iomsg->msg.msg_name = &iomsg->addr; |
257e84a5 | 5218 | iomsg->free_iov = iomsg->fast_iov; |
2ae523ed | 5219 | return sendmsg_copy_msghdr(&iomsg->msg, req->sr_msg.umsg, |
257e84a5 | 5220 | req->sr_msg.msg_flags, &iomsg->free_iov); |
2ae523ed PB |
5221 | } |
5222 | ||
93642ef8 PB |
5223 | static int io_sendmsg_prep_async(struct io_kiocb *req) |
5224 | { | |
5225 | int ret; | |
5226 | ||
93642ef8 PB |
5227 | ret = io_sendmsg_copy_hdr(req, req->async_data); |
5228 | if (!ret) | |
5229 | req->flags |= REQ_F_NEED_CLEANUP; | |
5230 | return ret; | |
5231 | } | |
5232 | ||
3529d8c2 | 5233 | static int io_sendmsg_prep(struct io_kiocb *req, const struct io_uring_sqe *sqe) |
03b1230c | 5234 | { |
e47293fd | 5235 | struct io_sr_msg *sr = &req->sr_msg; |
03b1230c | 5236 | |
d2b6f48b PB |
5237 | if (unlikely(req->ctx->flags & IORING_SETUP_IOPOLL)) |
5238 | return -EINVAL; | |
5239 | ||
270a5940 | 5240 | sr->umsg = u64_to_user_ptr(READ_ONCE(sqe->addr)); |
fddaface | 5241 | sr->len = READ_ONCE(sqe->len); |
04411806 PB |
5242 | sr->msg_flags = READ_ONCE(sqe->msg_flags) | MSG_NOSIGNAL; |
5243 | if (sr->msg_flags & MSG_DONTWAIT) | |
5244 | req->flags |= REQ_F_NOWAIT; | |
3529d8c2 | 5245 | |
d8768362 JA |
5246 | #ifdef CONFIG_COMPAT |
5247 | if (req->ctx->compat) | |
5248 | sr->msg_flags |= MSG_CMSG_COMPAT; | |
5249 | #endif | |
93642ef8 | 5250 | return 0; |
03b1230c JA |
5251 | } |
5252 | ||
889fca73 | 5253 | static int io_sendmsg(struct io_kiocb *req, unsigned int issue_flags) |
aa1fa28f | 5254 | { |
6b754c8b | 5255 | struct io_async_msghdr iomsg, *kmsg; |
0fa03c62 | 5256 | struct socket *sock; |
7a7cacba | 5257 | unsigned flags; |
0031275d | 5258 | int min_ret = 0; |
0fa03c62 JA |
5259 | int ret; |
5260 | ||
dba4a925 | 5261 | sock = sock_from_file(req->file); |
7a7cacba | 5262 | if (unlikely(!sock)) |
dba4a925 | 5263 | return -ENOTSOCK; |
3529d8c2 | 5264 | |
d886e185 PB |
5265 | if (req_has_async_data(req)) { |
5266 | kmsg = req->async_data; | |
5267 | } else { | |
7a7cacba PB |
5268 | ret = io_sendmsg_copy_hdr(req, &iomsg); |
5269 | if (ret) | |
5270 | return ret; | |
5271 | kmsg = &iomsg; | |
0fa03c62 | 5272 | } |
0fa03c62 | 5273 | |
04411806 PB |
5274 | flags = req->sr_msg.msg_flags; |
5275 | if (issue_flags & IO_URING_F_NONBLOCK) | |
7a7cacba | 5276 | flags |= MSG_DONTWAIT; |
0031275d SM |
5277 | if (flags & MSG_WAITALL) |
5278 | min_ret = iov_iter_count(&kmsg->msg.msg_iter); | |
5279 | ||
7a7cacba | 5280 | ret = __sys_sendmsg_sock(sock, &kmsg->msg, flags); |
0fa03c62 | 5281 | |
7297ce3d PB |
5282 | if (ret < min_ret) { |
5283 | if (ret == -EAGAIN && (issue_flags & IO_URING_F_NONBLOCK)) | |
5284 | return io_setup_async_msg(req, kmsg); | |
5285 | if (ret == -ERESTARTSYS) | |
5286 | ret = -EINTR; | |
5287 | req_set_fail(req); | |
5288 | } | |
257e84a5 PB |
5289 | /* fast path, check for non-NULL to avoid function call */ |
5290 | if (kmsg->free_iov) | |
5291 | kfree(kmsg->free_iov); | |
99bc4c38 | 5292 | req->flags &= ~REQ_F_NEED_CLEANUP; |
889fca73 | 5293 | __io_req_complete(req, issue_flags, ret, 0); |
5d17b4a4 | 5294 | return 0; |
03b1230c | 5295 | } |
aa1fa28f | 5296 | |
889fca73 | 5297 | static int io_send(struct io_kiocb *req, unsigned int issue_flags) |
fddaface | 5298 | { |
7a7cacba PB |
5299 | struct io_sr_msg *sr = &req->sr_msg; |
5300 | struct msghdr msg; | |
5301 | struct iovec iov; | |
fddaface | 5302 | struct socket *sock; |
7a7cacba | 5303 | unsigned flags; |
0031275d | 5304 | int min_ret = 0; |
fddaface JA |
5305 | int ret; |
5306 | ||
dba4a925 | 5307 | sock = sock_from_file(req->file); |
7a7cacba | 5308 | if (unlikely(!sock)) |
dba4a925 | 5309 | return -ENOTSOCK; |
fddaface | 5310 | |
7a7cacba PB |
5311 | ret = import_single_range(WRITE, sr->buf, sr->len, &iov, &msg.msg_iter); |
5312 | if (unlikely(ret)) | |
14db8411 | 5313 | return ret; |
fddaface | 5314 | |
7a7cacba PB |
5315 | msg.msg_name = NULL; |
5316 | msg.msg_control = NULL; | |
5317 | msg.msg_controllen = 0; | |
5318 | msg.msg_namelen = 0; | |
fddaface | 5319 | |
04411806 PB |
5320 | flags = req->sr_msg.msg_flags; |
5321 | if (issue_flags & IO_URING_F_NONBLOCK) | |
7a7cacba | 5322 | flags |= MSG_DONTWAIT; |
0031275d SM |
5323 | if (flags & MSG_WAITALL) |
5324 | min_ret = iov_iter_count(&msg.msg_iter); | |
5325 | ||
7a7cacba PB |
5326 | msg.msg_flags = flags; |
5327 | ret = sock_sendmsg(sock, &msg); | |
7297ce3d PB |
5328 | if (ret < min_ret) { |
5329 | if (ret == -EAGAIN && (issue_flags & IO_URING_F_NONBLOCK)) | |
5330 | return -EAGAIN; | |
5331 | if (ret == -ERESTARTSYS) | |
5332 | ret = -EINTR; | |
93d2bcd2 | 5333 | req_set_fail(req); |
7297ce3d | 5334 | } |
889fca73 | 5335 | __io_req_complete(req, issue_flags, ret, 0); |
fddaface | 5336 | return 0; |
fddaface JA |
5337 | } |
5338 | ||
1400e697 PB |
5339 | static int __io_recvmsg_copy_hdr(struct io_kiocb *req, |
5340 | struct io_async_msghdr *iomsg) | |
52de1fe1 JA |
5341 | { |
5342 | struct io_sr_msg *sr = &req->sr_msg; | |
5343 | struct iovec __user *uiov; | |
5344 | size_t iov_len; | |
5345 | int ret; | |
5346 | ||
1400e697 PB |
5347 | ret = __copy_msghdr_from_user(&iomsg->msg, sr->umsg, |
5348 | &iomsg->uaddr, &uiov, &iov_len); | |
52de1fe1 JA |
5349 | if (ret) |
5350 | return ret; | |
5351 | ||
5352 | if (req->flags & REQ_F_BUFFER_SELECT) { | |
5353 | if (iov_len > 1) | |
5354 | return -EINVAL; | |
5476dfed | 5355 | if (copy_from_user(iomsg->fast_iov, uiov, sizeof(*uiov))) |
52de1fe1 | 5356 | return -EFAULT; |
5476dfed | 5357 | sr->len = iomsg->fast_iov[0].iov_len; |
257e84a5 | 5358 | iomsg->free_iov = NULL; |
52de1fe1 | 5359 | } else { |
257e84a5 | 5360 | iomsg->free_iov = iomsg->fast_iov; |
89cd35c5 | 5361 | ret = __import_iovec(READ, uiov, iov_len, UIO_FASTIOV, |
257e84a5 | 5362 | &iomsg->free_iov, &iomsg->msg.msg_iter, |
89cd35c5 | 5363 | false); |
52de1fe1 JA |
5364 | if (ret > 0) |
5365 | ret = 0; | |
5366 | } | |
5367 | ||
5368 | return ret; | |
5369 | } | |
5370 | ||
5371 | #ifdef CONFIG_COMPAT | |
5372 | static int __io_compat_recvmsg_copy_hdr(struct io_kiocb *req, | |
1400e697 | 5373 | struct io_async_msghdr *iomsg) |
52de1fe1 | 5374 | { |
52de1fe1 JA |
5375 | struct io_sr_msg *sr = &req->sr_msg; |
5376 | struct compat_iovec __user *uiov; | |
5377 | compat_uptr_t ptr; | |
5378 | compat_size_t len; | |
5379 | int ret; | |
5380 | ||
4af3417a PB |
5381 | ret = __get_compat_msghdr(&iomsg->msg, sr->umsg_compat, &iomsg->uaddr, |
5382 | &ptr, &len); | |
52de1fe1 JA |
5383 | if (ret) |
5384 | return ret; | |
5385 | ||
5386 | uiov = compat_ptr(ptr); | |
5387 | if (req->flags & REQ_F_BUFFER_SELECT) { | |
5388 | compat_ssize_t clen; | |
5389 | ||
5390 | if (len > 1) | |
5391 | return -EINVAL; | |
5392 | if (!access_ok(uiov, sizeof(*uiov))) | |
5393 | return -EFAULT; | |
5394 | if (__get_user(clen, &uiov->iov_len)) | |
5395 | return -EFAULT; | |
5396 | if (clen < 0) | |
5397 | return -EINVAL; | |
2d280bc8 | 5398 | sr->len = clen; |
257e84a5 | 5399 | iomsg->free_iov = NULL; |
52de1fe1 | 5400 | } else { |
257e84a5 | 5401 | iomsg->free_iov = iomsg->fast_iov; |
89cd35c5 | 5402 | ret = __import_iovec(READ, (struct iovec __user *)uiov, len, |
257e84a5 | 5403 | UIO_FASTIOV, &iomsg->free_iov, |
89cd35c5 | 5404 | &iomsg->msg.msg_iter, true); |
52de1fe1 JA |
5405 | if (ret < 0) |
5406 | return ret; | |
5407 | } | |
5408 | ||
5409 | return 0; | |
5410 | } | |
5411 | #endif | |
5412 | ||
1400e697 PB |
5413 | static int io_recvmsg_copy_hdr(struct io_kiocb *req, |
5414 | struct io_async_msghdr *iomsg) | |
52de1fe1 | 5415 | { |
1400e697 | 5416 | iomsg->msg.msg_name = &iomsg->addr; |
52de1fe1 JA |
5417 | |
5418 | #ifdef CONFIG_COMPAT | |
5419 | if (req->ctx->compat) | |
1400e697 | 5420 | return __io_compat_recvmsg_copy_hdr(req, iomsg); |
fddaface | 5421 | #endif |
52de1fe1 | 5422 | |
1400e697 | 5423 | return __io_recvmsg_copy_hdr(req, iomsg); |
52de1fe1 JA |
5424 | } |
5425 | ||
bcda7baa | 5426 | static struct io_buffer *io_recv_buffer_select(struct io_kiocb *req, |
51aac424 | 5427 | unsigned int issue_flags) |
bcda7baa JA |
5428 | { |
5429 | struct io_sr_msg *sr = &req->sr_msg; | |
bcda7baa | 5430 | |
51aac424 | 5431 | return io_buffer_select(req, &sr->len, sr->bgid, issue_flags); |
fddaface JA |
5432 | } |
5433 | ||
93642ef8 | 5434 | static int io_recvmsg_prep_async(struct io_kiocb *req) |
aa1fa28f | 5435 | { |
99bc4c38 | 5436 | int ret; |
3529d8c2 | 5437 | |
93642ef8 PB |
5438 | ret = io_recvmsg_copy_hdr(req, req->async_data); |
5439 | if (!ret) | |
5440 | req->flags |= REQ_F_NEED_CLEANUP; | |
5441 | return ret; | |
5442 | } | |
5443 | ||
5444 | static int io_recvmsg_prep(struct io_kiocb *req, const struct io_uring_sqe *sqe) | |
5445 | { | |
5446 | struct io_sr_msg *sr = &req->sr_msg; | |
5447 | ||
d2b6f48b PB |
5448 | if (unlikely(req->ctx->flags & IORING_SETUP_IOPOLL)) |
5449 | return -EINVAL; | |
5450 | ||
270a5940 | 5451 | sr->umsg = u64_to_user_ptr(READ_ONCE(sqe->addr)); |
0b7b21e4 | 5452 | sr->len = READ_ONCE(sqe->len); |
bcda7baa | 5453 | sr->bgid = READ_ONCE(sqe->buf_group); |
04411806 PB |
5454 | sr->msg_flags = READ_ONCE(sqe->msg_flags) | MSG_NOSIGNAL; |
5455 | if (sr->msg_flags & MSG_DONTWAIT) | |
5456 | req->flags |= REQ_F_NOWAIT; | |
06b76d44 | 5457 | |
d8768362 JA |
5458 | #ifdef CONFIG_COMPAT |
5459 | if (req->ctx->compat) | |
5460 | sr->msg_flags |= MSG_CMSG_COMPAT; | |
5461 | #endif | |
7ba89d2a | 5462 | sr->done_io = 0; |
93642ef8 | 5463 | return 0; |
aa1fa28f JA |
5464 | } |
5465 | ||
7ba89d2a JA |
5466 | static bool io_net_retry(struct socket *sock, int flags) |
5467 | { | |
5468 | if (!(flags & MSG_WAITALL)) | |
5469 | return false; | |
5470 | return sock->type == SOCK_STREAM || sock->type == SOCK_SEQPACKET; | |
5471 | } | |
5472 | ||
889fca73 | 5473 | static int io_recvmsg(struct io_kiocb *req, unsigned int issue_flags) |
aa1fa28f | 5474 | { |
6b754c8b | 5475 | struct io_async_msghdr iomsg, *kmsg; |
7ba89d2a | 5476 | struct io_sr_msg *sr = &req->sr_msg; |
03b1230c | 5477 | struct socket *sock; |
7fbb1b54 | 5478 | struct io_buffer *kbuf; |
7a7cacba | 5479 | unsigned flags; |
d1fd1c20 | 5480 | int ret, min_ret = 0; |
45d189c6 | 5481 | bool force_nonblock = issue_flags & IO_URING_F_NONBLOCK; |
03b1230c | 5482 | |
dba4a925 | 5483 | sock = sock_from_file(req->file); |
7a7cacba | 5484 | if (unlikely(!sock)) |
dba4a925 | 5485 | return -ENOTSOCK; |
3529d8c2 | 5486 | |
d886e185 PB |
5487 | if (req_has_async_data(req)) { |
5488 | kmsg = req->async_data; | |
5489 | } else { | |
7a7cacba PB |
5490 | ret = io_recvmsg_copy_hdr(req, &iomsg); |
5491 | if (ret) | |
681fda8d | 5492 | return ret; |
7a7cacba PB |
5493 | kmsg = &iomsg; |
5494 | } | |
03b1230c | 5495 | |
bc02ef33 | 5496 | if (req->flags & REQ_F_BUFFER_SELECT) { |
51aac424 | 5497 | kbuf = io_recv_buffer_select(req, issue_flags); |
bc02ef33 | 5498 | if (IS_ERR(kbuf)) |
52de1fe1 | 5499 | return PTR_ERR(kbuf); |
7a7cacba | 5500 | kmsg->fast_iov[0].iov_base = u64_to_user_ptr(kbuf->addr); |
5476dfed PB |
5501 | kmsg->fast_iov[0].iov_len = req->sr_msg.len; |
5502 | iov_iter_init(&kmsg->msg.msg_iter, READ, kmsg->fast_iov, | |
7a7cacba PB |
5503 | 1, req->sr_msg.len); |
5504 | } | |
52de1fe1 | 5505 | |
04411806 PB |
5506 | flags = req->sr_msg.msg_flags; |
5507 | if (force_nonblock) | |
7a7cacba | 5508 | flags |= MSG_DONTWAIT; |
0031275d SM |
5509 | if (flags & MSG_WAITALL) |
5510 | min_ret = iov_iter_count(&kmsg->msg.msg_iter); | |
5511 | ||
7a7cacba PB |
5512 | ret = __sys_recvmsg_sock(sock, &kmsg->msg, req->sr_msg.umsg, |
5513 | kmsg->uaddr, flags); | |
7297ce3d PB |
5514 | if (ret < min_ret) { |
5515 | if (ret == -EAGAIN && force_nonblock) | |
5516 | return io_setup_async_msg(req, kmsg); | |
5517 | if (ret == -ERESTARTSYS) | |
5518 | ret = -EINTR; | |
7ba89d2a JA |
5519 | if (ret > 0 && io_net_retry(sock, flags)) { |
5520 | sr->done_io += ret; | |
8a3e8ee5 | 5521 | req->flags |= REQ_F_PARTIAL_IO; |
7ba89d2a JA |
5522 | return io_setup_async_msg(req, kmsg); |
5523 | } | |
7297ce3d PB |
5524 | req_set_fail(req); |
5525 | } else if ((flags & MSG_WAITALL) && (kmsg->msg.msg_flags & (MSG_TRUNC | MSG_CTRUNC))) { | |
5526 | req_set_fail(req); | |
5527 | } | |
03b1230c | 5528 | |
257e84a5 PB |
5529 | /* fast path, check for non-NULL to avoid function call */ |
5530 | if (kmsg->free_iov) | |
5531 | kfree(kmsg->free_iov); | |
99bc4c38 | 5532 | req->flags &= ~REQ_F_NEED_CLEANUP; |
7ba89d2a JA |
5533 | if (ret >= 0) |
5534 | ret += sr->done_io; | |
5535 | else if (sr->done_io) | |
5536 | ret = sr->done_io; | |
cc3cec83 | 5537 | __io_req_complete(req, issue_flags, ret, io_put_kbuf(req, issue_flags)); |
03b1230c | 5538 | return 0; |
0fa03c62 | 5539 | } |
5d17b4a4 | 5540 | |
889fca73 | 5541 | static int io_recv(struct io_kiocb *req, unsigned int issue_flags) |
fddaface | 5542 | { |
6b754c8b | 5543 | struct io_buffer *kbuf; |
7a7cacba PB |
5544 | struct io_sr_msg *sr = &req->sr_msg; |
5545 | struct msghdr msg; | |
5546 | void __user *buf = sr->buf; | |
fddaface | 5547 | struct socket *sock; |
7a7cacba PB |
5548 | struct iovec iov; |
5549 | unsigned flags; | |
d1fd1c20 | 5550 | int ret, min_ret = 0; |
45d189c6 | 5551 | bool force_nonblock = issue_flags & IO_URING_F_NONBLOCK; |
fddaface | 5552 | |
dba4a925 | 5553 | sock = sock_from_file(req->file); |
7a7cacba | 5554 | if (unlikely(!sock)) |
dba4a925 | 5555 | return -ENOTSOCK; |
fddaface | 5556 | |
bc02ef33 | 5557 | if (req->flags & REQ_F_BUFFER_SELECT) { |
51aac424 | 5558 | kbuf = io_recv_buffer_select(req, issue_flags); |
bcda7baa JA |
5559 | if (IS_ERR(kbuf)) |
5560 | return PTR_ERR(kbuf); | |
7a7cacba | 5561 | buf = u64_to_user_ptr(kbuf->addr); |
bc02ef33 | 5562 | } |
bcda7baa | 5563 | |
7a7cacba | 5564 | ret = import_single_range(READ, buf, sr->len, &iov, &msg.msg_iter); |
14c32eee PB |
5565 | if (unlikely(ret)) |
5566 | goto out_free; | |
fddaface | 5567 | |
7a7cacba PB |
5568 | msg.msg_name = NULL; |
5569 | msg.msg_control = NULL; | |
5570 | msg.msg_controllen = 0; | |
5571 | msg.msg_namelen = 0; | |
5572 | msg.msg_iocb = NULL; | |
5573 | msg.msg_flags = 0; | |
fddaface | 5574 | |
04411806 PB |
5575 | flags = req->sr_msg.msg_flags; |
5576 | if (force_nonblock) | |
7a7cacba | 5577 | flags |= MSG_DONTWAIT; |
0031275d SM |
5578 | if (flags & MSG_WAITALL) |
5579 | min_ret = iov_iter_count(&msg.msg_iter); | |
5580 | ||
7a7cacba | 5581 | ret = sock_recvmsg(sock, &msg, flags); |
7297ce3d PB |
5582 | if (ret < min_ret) { |
5583 | if (ret == -EAGAIN && force_nonblock) | |
5584 | return -EAGAIN; | |
5585 | if (ret == -ERESTARTSYS) | |
5586 | ret = -EINTR; | |
7ba89d2a JA |
5587 | if (ret > 0 && io_net_retry(sock, flags)) { |
5588 | sr->len -= ret; | |
5589 | sr->buf += ret; | |
5590 | sr->done_io += ret; | |
8a3e8ee5 | 5591 | req->flags |= REQ_F_PARTIAL_IO; |
7ba89d2a JA |
5592 | return -EAGAIN; |
5593 | } | |
7297ce3d PB |
5594 | req_set_fail(req); |
5595 | } else if ((flags & MSG_WAITALL) && (msg.msg_flags & (MSG_TRUNC | MSG_CTRUNC))) { | |
0d7c1153 | 5596 | out_free: |
93d2bcd2 | 5597 | req_set_fail(req); |
7297ce3d | 5598 | } |
cc3cec83 | 5599 | |
7ba89d2a JA |
5600 | if (ret >= 0) |
5601 | ret += sr->done_io; | |
5602 | else if (sr->done_io) | |
5603 | ret = sr->done_io; | |
cc3cec83 | 5604 | __io_req_complete(req, issue_flags, ret, io_put_kbuf(req, issue_flags)); |
fddaface | 5605 | return 0; |
fddaface JA |
5606 | } |
5607 | ||
3529d8c2 | 5608 | static int io_accept_prep(struct io_kiocb *req, const struct io_uring_sqe *sqe) |
17f2fe35 | 5609 | { |
8ed8d3c3 JA |
5610 | struct io_accept *accept = &req->accept; |
5611 | ||
14587a46 | 5612 | if (unlikely(req->ctx->flags & IORING_SETUP_IOPOLL)) |
17f2fe35 | 5613 | return -EINVAL; |
aaa4db12 | 5614 | if (sqe->ioprio || sqe->len || sqe->buf_index) |
17f2fe35 JA |
5615 | return -EINVAL; |
5616 | ||
d55e5f5b JA |
5617 | accept->addr = u64_to_user_ptr(READ_ONCE(sqe->addr)); |
5618 | accept->addr_len = u64_to_user_ptr(READ_ONCE(sqe->addr2)); | |
8ed8d3c3 | 5619 | accept->flags = READ_ONCE(sqe->accept_flags); |
09952e3e | 5620 | accept->nofile = rlimit(RLIMIT_NOFILE); |
a7083ad5 | 5621 | |
aaa4db12 | 5622 | accept->file_slot = READ_ONCE(sqe->file_index); |
adf3a9e9 | 5623 | if (accept->file_slot && (accept->flags & SOCK_CLOEXEC)) |
aaa4db12 | 5624 | return -EINVAL; |
a7083ad5 PB |
5625 | if (accept->flags & ~(SOCK_CLOEXEC | SOCK_NONBLOCK)) |
5626 | return -EINVAL; | |
5627 | if (SOCK_NONBLOCK != O_NONBLOCK && (accept->flags & SOCK_NONBLOCK)) | |
5628 | accept->flags = (accept->flags & ~SOCK_NONBLOCK) | O_NONBLOCK; | |
8ed8d3c3 | 5629 | return 0; |
8ed8d3c3 | 5630 | } |
17f2fe35 | 5631 | |
889fca73 | 5632 | static int io_accept(struct io_kiocb *req, unsigned int issue_flags) |
8ed8d3c3 JA |
5633 | { |
5634 | struct io_accept *accept = &req->accept; | |
45d189c6 | 5635 | bool force_nonblock = issue_flags & IO_URING_F_NONBLOCK; |
ac45abc0 | 5636 | unsigned int file_flags = force_nonblock ? O_NONBLOCK : 0; |
aaa4db12 | 5637 | bool fixed = !!accept->file_slot; |
a7083ad5 PB |
5638 | struct file *file; |
5639 | int ret, fd; | |
8ed8d3c3 | 5640 | |
aaa4db12 PB |
5641 | if (!fixed) { |
5642 | fd = __get_unused_fd_flags(accept->flags, accept->nofile); | |
5643 | if (unlikely(fd < 0)) | |
5644 | return fd; | |
5645 | } | |
a7083ad5 PB |
5646 | file = do_accept(req->file, file_flags, accept->addr, accept->addr_len, |
5647 | accept->flags); | |
5648 | if (IS_ERR(file)) { | |
aaa4db12 PB |
5649 | if (!fixed) |
5650 | put_unused_fd(fd); | |
a7083ad5 PB |
5651 | ret = PTR_ERR(file); |
5652 | if (ret == -EAGAIN && force_nonblock) | |
5653 | return -EAGAIN; | |
ac45abc0 PB |
5654 | if (ret == -ERESTARTSYS) |
5655 | ret = -EINTR; | |
93d2bcd2 | 5656 | req_set_fail(req); |
aaa4db12 | 5657 | } else if (!fixed) { |
a7083ad5 PB |
5658 | fd_install(fd, file); |
5659 | ret = fd; | |
aaa4db12 PB |
5660 | } else { |
5661 | ret = io_install_fixed_file(req, file, issue_flags, | |
5662 | accept->file_slot - 1); | |
ac45abc0 | 5663 | } |
889fca73 | 5664 | __io_req_complete(req, issue_flags, ret, 0); |
17f2fe35 | 5665 | return 0; |
8ed8d3c3 JA |
5666 | } |
5667 | ||
93642ef8 PB |
5668 | static int io_connect_prep_async(struct io_kiocb *req) |
5669 | { | |
5670 | struct io_async_connect *io = req->async_data; | |
5671 | struct io_connect *conn = &req->connect; | |
5672 | ||
5673 | return move_addr_to_kernel(conn->addr, conn->addr_len, &io->address); | |
5674 | } | |
5675 | ||
3529d8c2 | 5676 | static int io_connect_prep(struct io_kiocb *req, const struct io_uring_sqe *sqe) |
f499a021 | 5677 | { |
3529d8c2 | 5678 | struct io_connect *conn = &req->connect; |
f499a021 | 5679 | |
14587a46 | 5680 | if (unlikely(req->ctx->flags & IORING_SETUP_IOPOLL)) |
3fbb51c1 | 5681 | return -EINVAL; |
26578cda PB |
5682 | if (sqe->ioprio || sqe->len || sqe->buf_index || sqe->rw_flags || |
5683 | sqe->splice_fd_in) | |
3fbb51c1 JA |
5684 | return -EINVAL; |
5685 | ||
3529d8c2 JA |
5686 | conn->addr = u64_to_user_ptr(READ_ONCE(sqe->addr)); |
5687 | conn->addr_len = READ_ONCE(sqe->addr2); | |
93642ef8 | 5688 | return 0; |
f499a021 JA |
5689 | } |
5690 | ||
889fca73 | 5691 | static int io_connect(struct io_kiocb *req, unsigned int issue_flags) |
f8e85cf2 | 5692 | { |
e8c2bc1f | 5693 | struct io_async_connect __io, *io; |
f8e85cf2 | 5694 | unsigned file_flags; |
3fbb51c1 | 5695 | int ret; |
45d189c6 | 5696 | bool force_nonblock = issue_flags & IO_URING_F_NONBLOCK; |
f8e85cf2 | 5697 | |
d886e185 | 5698 | if (req_has_async_data(req)) { |
e8c2bc1f | 5699 | io = req->async_data; |
f499a021 | 5700 | } else { |
3529d8c2 JA |
5701 | ret = move_addr_to_kernel(req->connect.addr, |
5702 | req->connect.addr_len, | |
e8c2bc1f | 5703 | &__io.address); |
f499a021 JA |
5704 | if (ret) |
5705 | goto out; | |
5706 | io = &__io; | |
5707 | } | |
5708 | ||
3fbb51c1 JA |
5709 | file_flags = force_nonblock ? O_NONBLOCK : 0; |
5710 | ||
e8c2bc1f | 5711 | ret = __sys_connect_file(req->file, &io->address, |
3fbb51c1 | 5712 | req->connect.addr_len, file_flags); |
87f80d62 | 5713 | if ((ret == -EAGAIN || ret == -EINPROGRESS) && force_nonblock) { |
d886e185 | 5714 | if (req_has_async_data(req)) |
b7bb4f7d | 5715 | return -EAGAIN; |
e8c2bc1f | 5716 | if (io_alloc_async_data(req)) { |
f499a021 JA |
5717 | ret = -ENOMEM; |
5718 | goto out; | |
5719 | } | |
e8c2bc1f | 5720 | memcpy(req->async_data, &__io, sizeof(__io)); |
f8e85cf2 | 5721 | return -EAGAIN; |
f499a021 | 5722 | } |
f8e85cf2 JA |
5723 | if (ret == -ERESTARTSYS) |
5724 | ret = -EINTR; | |
f499a021 | 5725 | out: |
4e88d6e7 | 5726 | if (ret < 0) |
93d2bcd2 | 5727 | req_set_fail(req); |
889fca73 | 5728 | __io_req_complete(req, issue_flags, ret, 0); |
f8e85cf2 | 5729 | return 0; |
469956e8 Y |
5730 | } |
5731 | #else /* !CONFIG_NET */ | |
99a10081 JA |
5732 | #define IO_NETOP_FN(op) \ |
5733 | static int io_##op(struct io_kiocb *req, unsigned int issue_flags) \ | |
5734 | { \ | |
5735 | return -EOPNOTSUPP; \ | |
5736 | } | |
5737 | ||
5738 | #define IO_NETOP_PREP(op) \ | |
5739 | IO_NETOP_FN(op) \ | |
5740 | static int io_##op##_prep(struct io_kiocb *req, const struct io_uring_sqe *sqe) \ | |
5741 | { \ | |
5742 | return -EOPNOTSUPP; \ | |
5743 | } \ | |
5744 | ||
5745 | #define IO_NETOP_PREP_ASYNC(op) \ | |
5746 | IO_NETOP_PREP(op) \ | |
5747 | static int io_##op##_prep_async(struct io_kiocb *req) \ | |
5748 | { \ | |
5749 | return -EOPNOTSUPP; \ | |
5750 | } | |
5751 | ||
5752 | IO_NETOP_PREP_ASYNC(sendmsg); | |
5753 | IO_NETOP_PREP_ASYNC(recvmsg); | |
5754 | IO_NETOP_PREP_ASYNC(connect); | |
5755 | IO_NETOP_PREP(accept); | |
5756 | IO_NETOP_FN(send); | |
5757 | IO_NETOP_FN(recv); | |
469956e8 | 5758 | #endif /* CONFIG_NET */ |
f8e85cf2 | 5759 | |
d7718a9d JA |
5760 | struct io_poll_table { |
5761 | struct poll_table_struct pt; | |
5762 | struct io_kiocb *req; | |
68b11e8b | 5763 | int nr_entries; |
d7718a9d JA |
5764 | int error; |
5765 | }; | |
ce593a6c | 5766 | |
aa43477b | 5767 | #define IO_POLL_CANCEL_FLAG BIT(31) |
e2c0cb7c | 5768 | #define IO_POLL_REF_MASK GENMASK(30, 0) |
6d816e08 | 5769 | |
aa43477b PB |
5770 | /* |
5771 | * If refs part of ->poll_refs (see IO_POLL_REF_MASK) is 0, it's free. We can | |
5772 | * bump it and acquire ownership. It's disallowed to modify requests while not | |
5773 | * owning it, that prevents from races for enqueueing task_work's and b/w | |
5774 | * arming poll and wakeups. | |
5775 | */ | |
5776 | static inline bool io_poll_get_ownership(struct io_kiocb *req) | |
5777 | { | |
5778 | return !(atomic_fetch_inc(&req->poll_refs) & IO_POLL_REF_MASK); | |
d7718a9d JA |
5779 | } |
5780 | ||
aa43477b | 5781 | static void io_poll_mark_cancelled(struct io_kiocb *req) |
74ce6ce4 | 5782 | { |
aa43477b | 5783 | atomic_or(IO_POLL_CANCEL_FLAG, &req->poll_refs); |
74ce6ce4 JA |
5784 | } |
5785 | ||
d4e7cd36 | 5786 | static struct io_poll_iocb *io_poll_get_double(struct io_kiocb *req) |
18bceab1 | 5787 | { |
e8c2bc1f | 5788 | /* pure poll stashes this in ->async_data, poll driven retry elsewhere */ |
d4e7cd36 | 5789 | if (req->opcode == IORING_OP_POLL_ADD) |
e8c2bc1f | 5790 | return req->async_data; |
d4e7cd36 JA |
5791 | return req->apoll->double_poll; |
5792 | } | |
5793 | ||
5794 | static struct io_poll_iocb *io_poll_get_single(struct io_kiocb *req) | |
5795 | { | |
5796 | if (req->opcode == IORING_OP_POLL_ADD) | |
5797 | return &req->poll; | |
5798 | return &req->apoll->poll; | |
5799 | } | |
5800 | ||
5641897a | 5801 | static void io_poll_req_insert(struct io_kiocb *req) |
d4e7cd36 | 5802 | { |
5641897a PB |
5803 | struct io_ring_ctx *ctx = req->ctx; |
5804 | struct hlist_head *list; | |
18bceab1 | 5805 | |
cef216fc | 5806 | list = &ctx->cancel_hash[hash_long(req->cqe.user_data, ctx->cancel_hash_bits)]; |
5641897a | 5807 | hlist_add_head(&req->hash_node, list); |
18bceab1 JA |
5808 | } |
5809 | ||
5641897a PB |
5810 | static void io_init_poll_iocb(struct io_poll_iocb *poll, __poll_t events, |
5811 | wait_queue_func_t wake_func) | |
18bceab1 | 5812 | { |
5641897a | 5813 | poll->head = NULL; |
5641897a PB |
5814 | #define IO_POLL_UNMASK (EPOLLERR|EPOLLHUP|EPOLLNVAL|EPOLLRDHUP) |
5815 | /* mask in events that we always want/need */ | |
5816 | poll->events = events | IO_POLL_UNMASK; | |
5817 | INIT_LIST_HEAD(&poll->wait.entry); | |
5818 | init_waitqueue_func_entry(&poll->wait, wake_func); | |
18bceab1 JA |
5819 | } |
5820 | ||
aa43477b | 5821 | static inline void io_poll_remove_entry(struct io_poll_iocb *poll) |
18bceab1 | 5822 | { |
791f3465 | 5823 | struct wait_queue_head *head = smp_load_acquire(&poll->head); |
18bceab1 | 5824 | |
791f3465 PB |
5825 | if (head) { |
5826 | spin_lock_irq(&head->lock); | |
5827 | list_del_init(&poll->wait.entry); | |
5828 | poll->head = NULL; | |
5829 | spin_unlock_irq(&head->lock); | |
5830 | } | |
aa43477b | 5831 | } |
18bceab1 | 5832 | |
aa43477b PB |
5833 | static void io_poll_remove_entries(struct io_kiocb *req) |
5834 | { | |
91eac1c6 JA |
5835 | /* |
5836 | * Nothing to do if neither of those flags are set. Avoid dipping | |
5837 | * into the poll/apoll/double cachelines if we can. | |
5838 | */ | |
5839 | if (!(req->flags & (REQ_F_SINGLE_POLL | REQ_F_DOUBLE_POLL))) | |
5840 | return; | |
18bceab1 | 5841 | |
791f3465 PB |
5842 | /* |
5843 | * While we hold the waitqueue lock and the waitqueue is nonempty, | |
5844 | * wake_up_pollfree() will wait for us. However, taking the waitqueue | |
5845 | * lock in the first place can race with the waitqueue being freed. | |
5846 | * | |
5847 | * We solve this as eventpoll does: by taking advantage of the fact that | |
5848 | * all users of wake_up_pollfree() will RCU-delay the actual free. If | |
5849 | * we enter rcu_read_lock() and see that the pointer to the queue is | |
5850 | * non-NULL, we can then lock it without the memory being freed out from | |
5851 | * under us. | |
5852 | * | |
5853 | * Keep holding rcu_read_lock() as long as we hold the queue lock, in | |
5854 | * case the caller deletes the entry from the queue, leaving it empty. | |
5855 | * In that case, only RCU prevents the queue memory from being freed. | |
5856 | */ | |
5857 | rcu_read_lock(); | |
91eac1c6 JA |
5858 | if (req->flags & REQ_F_SINGLE_POLL) |
5859 | io_poll_remove_entry(io_poll_get_single(req)); | |
5860 | if (req->flags & REQ_F_DOUBLE_POLL) | |
5861 | io_poll_remove_entry(io_poll_get_double(req)); | |
791f3465 | 5862 | rcu_read_unlock(); |
18bceab1 JA |
5863 | } |
5864 | ||
aa43477b PB |
5865 | /* |
5866 | * All poll tw should go through this. Checks for poll events, manages | |
5867 | * references, does rewait, etc. | |
5868 | * | |
5869 | * Returns a negative error on failure. >0 when no action require, which is | |
5870 | * either spurious wakeup or multishot CQE is served. 0 when it's done with | |
cef216fc | 5871 | * the request, then the mask is stored in req->cqe.res. |
aa43477b | 5872 | */ |
5106dd6e | 5873 | static int io_poll_check_events(struct io_kiocb *req, bool locked) |
18bceab1 | 5874 | { |
74ce6ce4 | 5875 | struct io_ring_ctx *ctx = req->ctx; |
aa43477b | 5876 | int v; |
18bceab1 | 5877 | |
316319e8 | 5878 | /* req->task == current here, checking PF_EXITING is safe */ |
e09ee510 | 5879 | if (unlikely(req->task->flags & PF_EXITING)) |
aa43477b | 5880 | io_poll_mark_cancelled(req); |
18bceab1 | 5881 | |
aa43477b PB |
5882 | do { |
5883 | v = atomic_read(&req->poll_refs); | |
74ce6ce4 | 5884 | |
aa43477b PB |
5885 | /* tw handler should be the owner, and so have some references */ |
5886 | if (WARN_ON_ONCE(!(v & IO_POLL_REF_MASK))) | |
5887 | return 0; | |
5888 | if (v & IO_POLL_CANCEL_FLAG) | |
5889 | return -ECANCELED; | |
8706e04e | 5890 | |
cef216fc | 5891 | if (!req->cqe.res) { |
2804ecd8 | 5892 | struct poll_table_struct pt = { ._key = req->apoll_events }; |
cce64ef0 | 5893 | unsigned flags = locked ? 0 : IO_URING_F_UNLOCKED; |
18bceab1 | 5894 | |
cce64ef0 | 5895 | if (unlikely(!io_assign_file(req, flags))) |
7179c3ce | 5896 | return -EBADF; |
cef216fc | 5897 | req->cqe.res = vfs_poll(req->file, &pt) & req->apoll_events; |
c8b5e260 | 5898 | } |
74ce6ce4 | 5899 | |
aa43477b | 5900 | /* multishot, just fill an CQE and proceed */ |
cef216fc PB |
5901 | if (req->cqe.res && !(req->apoll_events & EPOLLONESHOT)) { |
5902 | __poll_t mask = mangle_poll(req->cqe.res & req->apoll_events); | |
aa43477b | 5903 | bool filled; |
18bceab1 | 5904 | |
aa43477b | 5905 | spin_lock(&ctx->completion_lock); |
cef216fc | 5906 | filled = io_fill_cqe_aux(ctx, req->cqe.user_data, mask, |
aa43477b PB |
5907 | IORING_CQE_F_MORE); |
5908 | io_commit_cqring(ctx); | |
5909 | spin_unlock(&ctx->completion_lock); | |
5910 | if (unlikely(!filled)) | |
5911 | return -ECANCELED; | |
5912 | io_cqring_ev_posted(ctx); | |
cef216fc | 5913 | } else if (req->cqe.res) { |
aa43477b PB |
5914 | return 0; |
5915 | } | |
18bceab1 | 5916 | |
aa43477b PB |
5917 | /* |
5918 | * Release all references, retry if someone tried to restart | |
5919 | * task_work while we were executing it. | |
5920 | */ | |
5921 | } while (atomic_sub_return(v & IO_POLL_REF_MASK, &req->poll_refs)); | |
18bceab1 | 5922 | |
18bceab1 JA |
5923 | return 1; |
5924 | } | |
5925 | ||
aa43477b | 5926 | static void io_poll_task_func(struct io_kiocb *req, bool *locked) |
18bceab1 | 5927 | { |
18bceab1 | 5928 | struct io_ring_ctx *ctx = req->ctx; |
aa43477b | 5929 | int ret; |
18bceab1 | 5930 | |
5106dd6e | 5931 | ret = io_poll_check_events(req, *locked); |
aa43477b PB |
5932 | if (ret > 0) |
5933 | return; | |
5934 | ||
5935 | if (!ret) { | |
cef216fc | 5936 | req->cqe.res = mangle_poll(req->cqe.res & req->poll.events); |
e27414be | 5937 | } else { |
cef216fc | 5938 | req->cqe.res = ret; |
aa43477b | 5939 | req_set_fail(req); |
a62682f9 | 5940 | } |
aa43477b PB |
5941 | |
5942 | io_poll_remove_entries(req); | |
5943 | spin_lock(&ctx->completion_lock); | |
5944 | hash_del(&req->hash_node); | |
cef216fc | 5945 | __io_req_complete_post(req, req->cqe.res, 0); |
aa43477b PB |
5946 | io_commit_cqring(ctx); |
5947 | spin_unlock(&ctx->completion_lock); | |
5948 | io_cqring_ev_posted(ctx); | |
18bceab1 JA |
5949 | } |
5950 | ||
aa43477b | 5951 | static void io_apoll_task_func(struct io_kiocb *req, bool *locked) |
18bceab1 JA |
5952 | { |
5953 | struct io_ring_ctx *ctx = req->ctx; | |
aa43477b | 5954 | int ret; |
18bceab1 | 5955 | |
5106dd6e | 5956 | ret = io_poll_check_events(req, *locked); |
aa43477b PB |
5957 | if (ret > 0) |
5958 | return; | |
18bceab1 | 5959 | |
aa43477b PB |
5960 | io_poll_remove_entries(req); |
5961 | spin_lock(&ctx->completion_lock); | |
5962 | hash_del(&req->hash_node); | |
5963 | spin_unlock(&ctx->completion_lock); | |
18bceab1 | 5964 | |
aa43477b PB |
5965 | if (!ret) |
5966 | io_req_task_submit(req, locked); | |
5967 | else | |
5968 | io_req_complete_failed(req, ret); | |
18bceab1 JA |
5969 | } |
5970 | ||
81459350 | 5971 | static void __io_poll_execute(struct io_kiocb *req, int mask, int events) |
aa43477b | 5972 | { |
cef216fc | 5973 | req->cqe.res = mask; |
81459350 JA |
5974 | /* |
5975 | * This is useful for poll that is armed on behalf of another | |
5976 | * request, and where the wakeup path could be on a different | |
5977 | * CPU. We want to avoid pulling in req->apoll->events for that | |
5978 | * case. | |
5979 | */ | |
2804ecd8 | 5980 | req->apoll_events = events; |
aa43477b PB |
5981 | if (req->opcode == IORING_OP_POLL_ADD) |
5982 | req->io_task_work.func = io_poll_task_func; | |
5983 | else | |
5984 | req->io_task_work.func = io_apoll_task_func; | |
5985 | ||
cef216fc | 5986 | trace_io_uring_task_add(req->ctx, req, req->cqe.user_data, req->opcode, mask); |
aa43477b PB |
5987 | io_req_task_work_add(req, false); |
5988 | } | |
5989 | ||
81459350 | 5990 | static inline void io_poll_execute(struct io_kiocb *req, int res, int events) |
aa43477b PB |
5991 | { |
5992 | if (io_poll_get_ownership(req)) | |
81459350 | 5993 | __io_poll_execute(req, res, events); |
aa43477b PB |
5994 | } |
5995 | ||
5996 | static void io_poll_cancel_req(struct io_kiocb *req) | |
5997 | { | |
5998 | io_poll_mark_cancelled(req); | |
5999 | /* kick tw, which should complete the request */ | |
81459350 | 6000 | io_poll_execute(req, 0, 0); |
aa43477b PB |
6001 | } |
6002 | ||
d89a4fac JA |
6003 | #define wqe_to_req(wait) ((void *)((unsigned long) (wait)->private & ~1)) |
6004 | #define wqe_is_double(wait) ((unsigned long) (wait)->private & 1) | |
6005 | ||
aa43477b PB |
6006 | static int io_poll_wake(struct wait_queue_entry *wait, unsigned mode, int sync, |
6007 | void *key) | |
18bceab1 | 6008 | { |
d89a4fac | 6009 | struct io_kiocb *req = wqe_to_req(wait); |
aa43477b PB |
6010 | struct io_poll_iocb *poll = container_of(wait, struct io_poll_iocb, |
6011 | wait); | |
18bceab1 JA |
6012 | __poll_t mask = key_to_poll(key); |
6013 | ||
791f3465 PB |
6014 | if (unlikely(mask & POLLFREE)) { |
6015 | io_poll_mark_cancelled(req); | |
6016 | /* we have to kick tw in case it's not already */ | |
81459350 | 6017 | io_poll_execute(req, 0, poll->events); |
791f3465 PB |
6018 | |
6019 | /* | |
6020 | * If the waitqueue is being freed early but someone is already | |
6021 | * holds ownership over it, we have to tear down the request as | |
6022 | * best we can. That means immediately removing the request from | |
6023 | * its waitqueue and preventing all further accesses to the | |
6024 | * waitqueue via the request. | |
6025 | */ | |
6026 | list_del_init(&poll->wait.entry); | |
6027 | ||
6028 | /* | |
6029 | * Careful: this *must* be the last step, since as soon | |
6030 | * as req->head is NULL'ed out, the request can be | |
6031 | * completed and freed, since aio_poll_complete_work() | |
6032 | * will no longer need to take the waitqueue lock. | |
6033 | */ | |
6034 | smp_store_release(&poll->head, NULL); | |
6035 | return 1; | |
6036 | } | |
6037 | ||
aa43477b | 6038 | /* for instances that support it check for an event match first */ |
18bceab1 JA |
6039 | if (mask && !(mask & poll->events)) |
6040 | return 0; | |
6041 | ||
eb0089d6 PB |
6042 | if (io_poll_get_ownership(req)) { |
6043 | /* optional, saves extra locking for removal in tw handler */ | |
6044 | if (mask && poll->events & EPOLLONESHOT) { | |
6045 | list_del_init(&poll->wait.entry); | |
6046 | poll->head = NULL; | |
d89a4fac JA |
6047 | if (wqe_is_double(wait)) |
6048 | req->flags &= ~REQ_F_DOUBLE_POLL; | |
6049 | else | |
6050 | req->flags &= ~REQ_F_SINGLE_POLL; | |
eb0089d6 | 6051 | } |
81459350 | 6052 | __io_poll_execute(req, mask, poll->events); |
eb0089d6 | 6053 | } |
18bceab1 | 6054 | return 1; |
18bceab1 JA |
6055 | } |
6056 | ||
6057 | static void __io_queue_proc(struct io_poll_iocb *poll, struct io_poll_table *pt, | |
807abcb0 JA |
6058 | struct wait_queue_head *head, |
6059 | struct io_poll_iocb **poll_ptr) | |
18bceab1 JA |
6060 | { |
6061 | struct io_kiocb *req = pt->req; | |
d89a4fac | 6062 | unsigned long wqe_private = (unsigned long) req; |
18bceab1 JA |
6063 | |
6064 | /* | |
68b11e8b PB |
6065 | * The file being polled uses multiple waitqueues for poll handling |
6066 | * (e.g. one for read, one for write). Setup a separate io_poll_iocb | |
6067 | * if this happens. | |
18bceab1 | 6068 | */ |
68b11e8b | 6069 | if (unlikely(pt->nr_entries)) { |
aa43477b | 6070 | struct io_poll_iocb *first = poll; |
58852d4d | 6071 | |
23a65db8 | 6072 | /* double add on the same waitqueue head, ignore */ |
aa43477b | 6073 | if (first->head == head) |
23a65db8 | 6074 | return; |
18bceab1 | 6075 | /* already have a 2nd entry, fail a third attempt */ |
807abcb0 | 6076 | if (*poll_ptr) { |
23a65db8 PB |
6077 | if ((*poll_ptr)->head == head) |
6078 | return; | |
18bceab1 JA |
6079 | pt->error = -EINVAL; |
6080 | return; | |
6081 | } | |
aa43477b | 6082 | |
18bceab1 JA |
6083 | poll = kmalloc(sizeof(*poll), GFP_ATOMIC); |
6084 | if (!poll) { | |
6085 | pt->error = -ENOMEM; | |
6086 | return; | |
6087 | } | |
d89a4fac JA |
6088 | /* mark as double wq entry */ |
6089 | wqe_private |= 1; | |
91eac1c6 | 6090 | req->flags |= REQ_F_DOUBLE_POLL; |
aa43477b | 6091 | io_init_poll_iocb(poll, first->events, first->wait.func); |
807abcb0 | 6092 | *poll_ptr = poll; |
d886e185 PB |
6093 | if (req->opcode == IORING_OP_POLL_ADD) |
6094 | req->flags |= REQ_F_ASYNC_DATA; | |
18bceab1 JA |
6095 | } |
6096 | ||
91eac1c6 | 6097 | req->flags |= REQ_F_SINGLE_POLL; |
68b11e8b | 6098 | pt->nr_entries++; |
18bceab1 | 6099 | poll->head = head; |
d89a4fac | 6100 | poll->wait.private = (void *) wqe_private; |
a31eb4a2 JX |
6101 | |
6102 | if (poll->events & EPOLLEXCLUSIVE) | |
6103 | add_wait_queue_exclusive(head, &poll->wait); | |
6104 | else | |
6105 | add_wait_queue(head, &poll->wait); | |
18bceab1 JA |
6106 | } |
6107 | ||
aa43477b | 6108 | static void io_poll_queue_proc(struct file *file, struct wait_queue_head *head, |
18bceab1 JA |
6109 | struct poll_table_struct *p) |
6110 | { | |
6111 | struct io_poll_table *pt = container_of(p, struct io_poll_table, pt); | |
d7718a9d | 6112 | |
aa43477b PB |
6113 | __io_queue_proc(&pt->req->poll, pt, head, |
6114 | (struct io_poll_iocb **) &pt->req->async_data); | |
d7718a9d JA |
6115 | } |
6116 | ||
aa43477b PB |
6117 | static int __io_arm_poll_handler(struct io_kiocb *req, |
6118 | struct io_poll_iocb *poll, | |
6119 | struct io_poll_table *ipt, __poll_t mask) | |
d7718a9d JA |
6120 | { |
6121 | struct io_ring_ctx *ctx = req->ctx; | |
aa43477b | 6122 | int v; |
d7718a9d | 6123 | |
4d52f338 | 6124 | INIT_HLIST_NODE(&req->hash_node); |
aa43477b | 6125 | io_init_poll_iocb(poll, mask, io_poll_wake); |
b90cd197 | 6126 | poll->file = req->file; |
d7718a9d JA |
6127 | |
6128 | ipt->pt._key = mask; | |
6129 | ipt->req = req; | |
68b11e8b PB |
6130 | ipt->error = 0; |
6131 | ipt->nr_entries = 0; | |
d7718a9d | 6132 | |
aa43477b PB |
6133 | /* |
6134 | * Take the ownership to delay any tw execution up until we're done | |
6135 | * with poll arming. see io_poll_get_ownership(). | |
6136 | */ | |
6137 | atomic_set(&req->poll_refs, 1); | |
d7718a9d | 6138 | mask = vfs_poll(req->file, &ipt->pt) & poll->events; |
aa43477b PB |
6139 | |
6140 | if (mask && (poll->events & EPOLLONESHOT)) { | |
6141 | io_poll_remove_entries(req); | |
6142 | /* no one else has access to the req, forget about the ref */ | |
6143 | return mask; | |
6144 | } | |
6145 | if (!mask && unlikely(ipt->error || !ipt->nr_entries)) { | |
6146 | io_poll_remove_entries(req); | |
6147 | if (!ipt->error) | |
6148 | ipt->error = -EINVAL; | |
6149 | return 0; | |
6150 | } | |
d7718a9d | 6151 | |
79ebeaee | 6152 | spin_lock(&ctx->completion_lock); |
aa43477b PB |
6153 | io_poll_req_insert(req); |
6154 | spin_unlock(&ctx->completion_lock); | |
6155 | ||
6156 | if (mask) { | |
6157 | /* can't multishot if failed, just queue the event we've got */ | |
6158 | if (unlikely(ipt->error || !ipt->nr_entries)) | |
6159 | poll->events |= EPOLLONESHOT; | |
81459350 | 6160 | __io_poll_execute(req, mask, poll->events); |
aa43477b | 6161 | return 0; |
d7718a9d JA |
6162 | } |
6163 | ||
aa43477b PB |
6164 | /* |
6165 | * Release ownership. If someone tried to queue a tw while it was | |
6166 | * locked, kick it off for them. | |
6167 | */ | |
6168 | v = atomic_dec_return(&req->poll_refs); | |
6169 | if (unlikely(v & IO_POLL_REF_MASK)) | |
81459350 | 6170 | __io_poll_execute(req, 0, poll->events); |
aa43477b PB |
6171 | return 0; |
6172 | } | |
6173 | ||
6174 | static void io_async_queue_proc(struct file *file, struct wait_queue_head *head, | |
6175 | struct poll_table_struct *p) | |
6176 | { | |
6177 | struct io_poll_table *pt = container_of(p, struct io_poll_table, pt); | |
6178 | struct async_poll *apoll = pt->req->apoll; | |
6179 | ||
6180 | __io_queue_proc(&apoll->poll, pt, head, &apoll->double_poll); | |
d7718a9d JA |
6181 | } |
6182 | ||
59b735ae OL |
6183 | enum { |
6184 | IO_APOLL_OK, | |
6185 | IO_APOLL_ABORTED, | |
6186 | IO_APOLL_READY | |
6187 | }; | |
6188 | ||
4d9237e3 | 6189 | static int io_arm_poll_handler(struct io_kiocb *req, unsigned issue_flags) |
d7718a9d JA |
6190 | { |
6191 | const struct io_op_def *def = &io_op_defs[req->opcode]; | |
6192 | struct io_ring_ctx *ctx = req->ctx; | |
6193 | struct async_poll *apoll; | |
6194 | struct io_poll_table ipt; | |
aa43477b PB |
6195 | __poll_t mask = EPOLLONESHOT | POLLERR | POLLPRI; |
6196 | int ret; | |
d7718a9d | 6197 | |
b2d9c3da PB |
6198 | if (!def->pollin && !def->pollout) |
6199 | return IO_APOLL_ABORTED; | |
658d0a40 PB |
6200 | if (!file_can_poll(req->file) || (req->flags & REQ_F_POLLED)) |
6201 | return IO_APOLL_ABORTED; | |
b2d9c3da PB |
6202 | |
6203 | if (def->pollin) { | |
b2d9c3da PB |
6204 | mask |= POLLIN | POLLRDNORM; |
6205 | ||
6206 | /* If reading from MSG_ERRQUEUE using recvmsg, ignore POLLIN */ | |
6207 | if ((req->opcode == IORING_OP_RECVMSG) && | |
6208 | (req->sr_msg.msg_flags & MSG_ERRQUEUE)) | |
6209 | mask &= ~POLLIN; | |
6210 | } else { | |
b2d9c3da PB |
6211 | mask |= POLLOUT | POLLWRNORM; |
6212 | } | |
52dd8640 DY |
6213 | if (def->poll_exclusive) |
6214 | mask |= EPOLLEXCLUSIVE; | |
4d9237e3 JA |
6215 | if (!(issue_flags & IO_URING_F_UNLOCKED) && |
6216 | !list_empty(&ctx->apoll_cache)) { | |
6217 | apoll = list_first_entry(&ctx->apoll_cache, struct async_poll, | |
6218 | poll.wait.entry); | |
6219 | list_del_init(&apoll->poll.wait.entry); | |
6220 | } else { | |
6221 | apoll = kmalloc(sizeof(*apoll), GFP_ATOMIC); | |
6222 | if (unlikely(!apoll)) | |
6223 | return IO_APOLL_ABORTED; | |
6224 | } | |
807abcb0 | 6225 | apoll->double_poll = NULL; |
d7718a9d | 6226 | req->apoll = apoll; |
b2d9c3da | 6227 | req->flags |= REQ_F_POLLED; |
d7718a9d JA |
6228 | ipt.pt._qproc = io_async_queue_proc; |
6229 | ||
4d55f238 | 6230 | io_kbuf_recycle(req, issue_flags); |
abdad709 | 6231 | |
aa43477b | 6232 | ret = __io_arm_poll_handler(req, &apoll->poll, &ipt, mask); |
41a5169c HX |
6233 | if (ret || ipt.error) |
6234 | return ret ? IO_APOLL_READY : IO_APOLL_ABORTED; | |
6235 | ||
cef216fc | 6236 | trace_io_uring_poll_arm(ctx, req, req->cqe.user_data, req->opcode, |
236daeae | 6237 | mask, apoll->poll.events); |
59b735ae | 6238 | return IO_APOLL_OK; |
d7718a9d JA |
6239 | } |
6240 | ||
76e1b642 JA |
6241 | /* |
6242 | * Returns true if we found and killed one or more poll requests | |
6243 | */ | |
c072481d PB |
6244 | static __cold bool io_poll_remove_all(struct io_ring_ctx *ctx, |
6245 | struct task_struct *tsk, bool cancel_all) | |
221c5eb2 | 6246 | { |
78076bb6 | 6247 | struct hlist_node *tmp; |
221c5eb2 | 6248 | struct io_kiocb *req; |
aa43477b PB |
6249 | bool found = false; |
6250 | int i; | |
221c5eb2 | 6251 | |
79ebeaee | 6252 | spin_lock(&ctx->completion_lock); |
78076bb6 JA |
6253 | for (i = 0; i < (1U << ctx->cancel_hash_bits); i++) { |
6254 | struct hlist_head *list; | |
6255 | ||
6256 | list = &ctx->cancel_hash[i]; | |
f3606e3a | 6257 | hlist_for_each_entry_safe(req, tmp, list, hash_node) { |
42a7b4ed | 6258 | if (io_match_task_safe(req, tsk, cancel_all)) { |
61bc84c4 | 6259 | hlist_del_init(&req->hash_node); |
aa43477b PB |
6260 | io_poll_cancel_req(req); |
6261 | found = true; | |
6262 | } | |
f3606e3a | 6263 | } |
221c5eb2 | 6264 | } |
79ebeaee | 6265 | spin_unlock(&ctx->completion_lock); |
aa43477b | 6266 | return found; |
221c5eb2 JA |
6267 | } |
6268 | ||
9ba5fac8 PB |
6269 | static struct io_kiocb *io_poll_find(struct io_ring_ctx *ctx, __u64 sqe_addr, |
6270 | bool poll_only) | |
e07785b0 | 6271 | __must_hold(&ctx->completion_lock) |
47f46768 | 6272 | { |
78076bb6 | 6273 | struct hlist_head *list; |
47f46768 JA |
6274 | struct io_kiocb *req; |
6275 | ||
78076bb6 JA |
6276 | list = &ctx->cancel_hash[hash_long(sqe_addr, ctx->cancel_hash_bits)]; |
6277 | hlist_for_each_entry(req, list, hash_node) { | |
cef216fc | 6278 | if (sqe_addr != req->cqe.user_data) |
b41e9852 | 6279 | continue; |
9ba5fac8 PB |
6280 | if (poll_only && req->opcode != IORING_OP_POLL_ADD) |
6281 | continue; | |
b2cb805f | 6282 | return req; |
47f46768 | 6283 | } |
b2cb805f JA |
6284 | return NULL; |
6285 | } | |
6286 | ||
aa43477b PB |
6287 | static bool io_poll_disarm(struct io_kiocb *req) |
6288 | __must_hold(&ctx->completion_lock) | |
6289 | { | |
6290 | if (!io_poll_get_ownership(req)) | |
6291 | return false; | |
6292 | io_poll_remove_entries(req); | |
6293 | hash_del(&req->hash_node); | |
6294 | return true; | |
6295 | } | |
6296 | ||
9ba5fac8 PB |
6297 | static int io_poll_cancel(struct io_ring_ctx *ctx, __u64 sqe_addr, |
6298 | bool poll_only) | |
e07785b0 | 6299 | __must_hold(&ctx->completion_lock) |
b2cb805f | 6300 | { |
aa43477b | 6301 | struct io_kiocb *req = io_poll_find(ctx, sqe_addr, poll_only); |
b2cb805f | 6302 | |
b2cb805f JA |
6303 | if (!req) |
6304 | return -ENOENT; | |
aa43477b PB |
6305 | io_poll_cancel_req(req); |
6306 | return 0; | |
47f46768 JA |
6307 | } |
6308 | ||
9096af3e PB |
6309 | static __poll_t io_poll_parse_events(const struct io_uring_sqe *sqe, |
6310 | unsigned int flags) | |
6311 | { | |
6312 | u32 events; | |
47f46768 | 6313 | |
9096af3e PB |
6314 | events = READ_ONCE(sqe->poll32_events); |
6315 | #ifdef __BIG_ENDIAN | |
6316 | events = swahw32(events); | |
6317 | #endif | |
6318 | if (!(flags & IORING_POLL_ADD_MULTI)) | |
6319 | events |= EPOLLONESHOT; | |
6320 | return demangle_poll(events) | (events & (EPOLLEXCLUSIVE|EPOLLONESHOT)); | |
47f46768 JA |
6321 | } |
6322 | ||
c5de0036 | 6323 | static int io_poll_update_prep(struct io_kiocb *req, |
3529d8c2 | 6324 | const struct io_uring_sqe *sqe) |
0969e783 | 6325 | { |
c5de0036 PB |
6326 | struct io_poll_update *upd = &req->poll_update; |
6327 | u32 flags; | |
6328 | ||
0969e783 JA |
6329 | if (unlikely(req->ctx->flags & IORING_SETUP_IOPOLL)) |
6330 | return -EINVAL; | |
26578cda | 6331 | if (sqe->ioprio || sqe->buf_index || sqe->splice_fd_in) |
c5de0036 PB |
6332 | return -EINVAL; |
6333 | flags = READ_ONCE(sqe->len); | |
6334 | if (flags & ~(IORING_POLL_UPDATE_EVENTS | IORING_POLL_UPDATE_USER_DATA | | |
6335 | IORING_POLL_ADD_MULTI)) | |
6336 | return -EINVAL; | |
6337 | /* meaningless without update */ | |
6338 | if (flags == IORING_POLL_ADD_MULTI) | |
0969e783 JA |
6339 | return -EINVAL; |
6340 | ||
c5de0036 PB |
6341 | upd->old_user_data = READ_ONCE(sqe->addr); |
6342 | upd->update_events = flags & IORING_POLL_UPDATE_EVENTS; | |
6343 | upd->update_user_data = flags & IORING_POLL_UPDATE_USER_DATA; | |
221c5eb2 | 6344 | |
c5de0036 PB |
6345 | upd->new_user_data = READ_ONCE(sqe->off); |
6346 | if (!upd->update_user_data && upd->new_user_data) | |
6347 | return -EINVAL; | |
6348 | if (upd->update_events) | |
6349 | upd->events = io_poll_parse_events(sqe, flags); | |
6350 | else if (sqe->poll32_events) | |
6351 | return -EINVAL; | |
221c5eb2 | 6352 | |
221c5eb2 JA |
6353 | return 0; |
6354 | } | |
6355 | ||
3529d8c2 | 6356 | static int io_poll_add_prep(struct io_kiocb *req, const struct io_uring_sqe *sqe) |
221c5eb2 JA |
6357 | { |
6358 | struct io_poll_iocb *poll = &req->poll; | |
c5de0036 | 6359 | u32 flags; |
221c5eb2 JA |
6360 | |
6361 | if (unlikely(req->ctx->flags & IORING_SETUP_IOPOLL)) | |
6362 | return -EINVAL; | |
c5de0036 | 6363 | if (sqe->ioprio || sqe->buf_index || sqe->off || sqe->addr) |
88e41cf9 JA |
6364 | return -EINVAL; |
6365 | flags = READ_ONCE(sqe->len); | |
c5de0036 | 6366 | if (flags & ~IORING_POLL_ADD_MULTI) |
221c5eb2 | 6367 | return -EINVAL; |
04c76b41 PB |
6368 | if ((flags & IORING_POLL_ADD_MULTI) && (req->flags & REQ_F_CQE_SKIP)) |
6369 | return -EINVAL; | |
221c5eb2 | 6370 | |
48dcd38d | 6371 | io_req_set_refcount(req); |
2804ecd8 | 6372 | req->apoll_events = poll->events = io_poll_parse_events(sqe, flags); |
0969e783 JA |
6373 | return 0; |
6374 | } | |
6375 | ||
61e98203 | 6376 | static int io_poll_add(struct io_kiocb *req, unsigned int issue_flags) |
0969e783 JA |
6377 | { |
6378 | struct io_poll_iocb *poll = &req->poll; | |
0969e783 | 6379 | struct io_poll_table ipt; |
aa43477b | 6380 | int ret; |
0969e783 | 6381 | |
d7718a9d | 6382 | ipt.pt._qproc = io_poll_queue_proc; |
36703247 | 6383 | |
aa43477b PB |
6384 | ret = __io_arm_poll_handler(req, &req->poll, &ipt, poll->events); |
6385 | ret = ret ?: ipt.error; | |
6386 | if (ret) | |
6387 | __io_req_complete(req, issue_flags, ret, 0); | |
6388 | return 0; | |
221c5eb2 JA |
6389 | } |
6390 | ||
c5de0036 | 6391 | static int io_poll_update(struct io_kiocb *req, unsigned int issue_flags) |
b69de288 JA |
6392 | { |
6393 | struct io_ring_ctx *ctx = req->ctx; | |
6394 | struct io_kiocb *preq; | |
2bbb146d | 6395 | int ret2, ret = 0; |
cc8e9ba7 | 6396 | bool locked; |
b69de288 | 6397 | |
79ebeaee | 6398 | spin_lock(&ctx->completion_lock); |
9ba5fac8 | 6399 | preq = io_poll_find(ctx, req->poll_update.old_user_data, true); |
aa43477b | 6400 | if (!preq || !io_poll_disarm(preq)) { |
79ebeaee | 6401 | spin_unlock(&ctx->completion_lock); |
aa43477b | 6402 | ret = preq ? -EALREADY : -ENOENT; |
2bbb146d | 6403 | goto out; |
b69de288 | 6404 | } |
79ebeaee | 6405 | spin_unlock(&ctx->completion_lock); |
cb3b200e | 6406 | |
2bbb146d PB |
6407 | if (req->poll_update.update_events || req->poll_update.update_user_data) { |
6408 | /* only mask one event flags, keep behavior flags */ | |
6409 | if (req->poll_update.update_events) { | |
6410 | preq->poll.events &= ~0xffff; | |
6411 | preq->poll.events |= req->poll_update.events & 0xffff; | |
6412 | preq->poll.events |= IO_POLL_UNMASK; | |
cb3b200e | 6413 | } |
2bbb146d | 6414 | if (req->poll_update.update_user_data) |
cef216fc | 6415 | preq->cqe.user_data = req->poll_update.new_user_data; |
b69de288 | 6416 | |
2bbb146d PB |
6417 | ret2 = io_poll_add(preq, issue_flags); |
6418 | /* successfully updated, don't complete poll request */ | |
6419 | if (!ret2) | |
6420 | goto out; | |
b69de288 | 6421 | } |
6224590d | 6422 | |
2bbb146d | 6423 | req_set_fail(preq); |
cef216fc | 6424 | preq->cqe.res = -ECANCELED; |
cc8e9ba7 PB |
6425 | locked = !(issue_flags & IO_URING_F_UNLOCKED); |
6426 | io_req_task_complete(preq, &locked); | |
2bbb146d PB |
6427 | out: |
6428 | if (ret < 0) | |
6224590d | 6429 | req_set_fail(req); |
2bbb146d | 6430 | /* complete update request, we're done with it */ |
cc8e9ba7 | 6431 | __io_req_complete(req, issue_flags, ret, 0); |
b69de288 | 6432 | return 0; |
89850fce JA |
6433 | } |
6434 | ||
5262f567 JA |
6435 | static enum hrtimer_restart io_timeout_fn(struct hrtimer *timer) |
6436 | { | |
ad8a48ac JA |
6437 | struct io_timeout_data *data = container_of(timer, |
6438 | struct io_timeout_data, timer); | |
6439 | struct io_kiocb *req = data->req; | |
6440 | struct io_ring_ctx *ctx = req->ctx; | |
5262f567 JA |
6441 | unsigned long flags; |
6442 | ||
89850fce | 6443 | spin_lock_irqsave(&ctx->timeout_lock, flags); |
a71976f3 | 6444 | list_del_init(&req->timeout.list); |
01cec8c1 PB |
6445 | atomic_set(&req->ctx->cq_timeouts, |
6446 | atomic_read(&req->ctx->cq_timeouts) + 1); | |
89850fce | 6447 | spin_unlock_irqrestore(&ctx->timeout_lock, flags); |
01cec8c1 | 6448 | |
a90c8bf6 PB |
6449 | if (!(data->flags & IORING_TIMEOUT_ETIME_SUCCESS)) |
6450 | req_set_fail(req); | |
6451 | ||
cef216fc | 6452 | req->cqe.res = -ETIME; |
a90c8bf6 | 6453 | req->io_task_work.func = io_req_task_complete; |
4813c377 | 6454 | io_req_task_work_add(req, false); |
5262f567 JA |
6455 | return HRTIMER_NORESTART; |
6456 | } | |
6457 | ||
fbd15848 PB |
6458 | static struct io_kiocb *io_timeout_extract(struct io_ring_ctx *ctx, |
6459 | __u64 user_data) | |
89850fce | 6460 | __must_hold(&ctx->timeout_lock) |
f254ac04 | 6461 | { |
fbd15848 | 6462 | struct io_timeout_data *io; |
47f46768 | 6463 | struct io_kiocb *req; |
fd9c7bc5 | 6464 | bool found = false; |
f254ac04 | 6465 | |
135fcde8 | 6466 | list_for_each_entry(req, &ctx->timeout_list, timeout.list) { |
cef216fc | 6467 | found = user_data == req->cqe.user_data; |
fd9c7bc5 | 6468 | if (found) |
47f46768 | 6469 | break; |
47f46768 | 6470 | } |
fd9c7bc5 PB |
6471 | if (!found) |
6472 | return ERR_PTR(-ENOENT); | |
fbd15848 PB |
6473 | |
6474 | io = req->async_data; | |
fd9c7bc5 | 6475 | if (hrtimer_try_to_cancel(&io->timer) == -1) |
fbd15848 | 6476 | return ERR_PTR(-EALREADY); |
a71976f3 | 6477 | list_del_init(&req->timeout.list); |
fbd15848 PB |
6478 | return req; |
6479 | } | |
47f46768 | 6480 | |
fbd15848 | 6481 | static int io_timeout_cancel(struct io_ring_ctx *ctx, __u64 user_data) |
ec3c3d0f | 6482 | __must_hold(&ctx->completion_lock) |
89850fce | 6483 | __must_hold(&ctx->timeout_lock) |
fbd15848 PB |
6484 | { |
6485 | struct io_kiocb *req = io_timeout_extract(ctx, user_data); | |
6486 | ||
6487 | if (IS_ERR(req)) | |
6488 | return PTR_ERR(req); | |
6695490d | 6489 | io_req_task_queue_fail(req, -ECANCELED); |
f254ac04 JA |
6490 | return 0; |
6491 | } | |
6492 | ||
50c1df2b JA |
6493 | static clockid_t io_timeout_get_clock(struct io_timeout_data *data) |
6494 | { | |
6495 | switch (data->flags & IORING_TIMEOUT_CLOCK_MASK) { | |
6496 | case IORING_TIMEOUT_BOOTTIME: | |
6497 | return CLOCK_BOOTTIME; | |
6498 | case IORING_TIMEOUT_REALTIME: | |
6499 | return CLOCK_REALTIME; | |
6500 | default: | |
6501 | /* can't happen, vetted at prep time */ | |
6502 | WARN_ON_ONCE(1); | |
6503 | fallthrough; | |
6504 | case 0: | |
6505 | return CLOCK_MONOTONIC; | |
6506 | } | |
6507 | } | |
6508 | ||
f1042b6c PB |
6509 | static int io_linked_timeout_update(struct io_ring_ctx *ctx, __u64 user_data, |
6510 | struct timespec64 *ts, enum hrtimer_mode mode) | |
6511 | __must_hold(&ctx->timeout_lock) | |
6512 | { | |
6513 | struct io_timeout_data *io; | |
6514 | struct io_kiocb *req; | |
6515 | bool found = false; | |
6516 | ||
6517 | list_for_each_entry(req, &ctx->ltimeout_list, timeout.list) { | |
cef216fc | 6518 | found = user_data == req->cqe.user_data; |
f1042b6c PB |
6519 | if (found) |
6520 | break; | |
6521 | } | |
6522 | if (!found) | |
6523 | return -ENOENT; | |
6524 | ||
6525 | io = req->async_data; | |
6526 | if (hrtimer_try_to_cancel(&io->timer) == -1) | |
6527 | return -EALREADY; | |
6528 | hrtimer_init(&io->timer, io_timeout_get_clock(io), mode); | |
6529 | io->timer.function = io_link_timeout_fn; | |
6530 | hrtimer_start(&io->timer, timespec64_to_ktime(*ts), mode); | |
6531 | return 0; | |
6532 | } | |
6533 | ||
9c8e11b3 PB |
6534 | static int io_timeout_update(struct io_ring_ctx *ctx, __u64 user_data, |
6535 | struct timespec64 *ts, enum hrtimer_mode mode) | |
89850fce | 6536 | __must_hold(&ctx->timeout_lock) |
47f46768 | 6537 | { |
9c8e11b3 PB |
6538 | struct io_kiocb *req = io_timeout_extract(ctx, user_data); |
6539 | struct io_timeout_data *data; | |
47f46768 | 6540 | |
9c8e11b3 PB |
6541 | if (IS_ERR(req)) |
6542 | return PTR_ERR(req); | |
47f46768 | 6543 | |
9c8e11b3 PB |
6544 | req->timeout.off = 0; /* noseq */ |
6545 | data = req->async_data; | |
6546 | list_add_tail(&req->timeout.list, &ctx->timeout_list); | |
50c1df2b | 6547 | hrtimer_init(&data->timer, io_timeout_get_clock(data), mode); |
9c8e11b3 PB |
6548 | data->timer.function = io_timeout_fn; |
6549 | hrtimer_start(&data->timer, timespec64_to_ktime(*ts), mode); | |
6550 | return 0; | |
47f46768 JA |
6551 | } |
6552 | ||
3529d8c2 JA |
6553 | static int io_timeout_remove_prep(struct io_kiocb *req, |
6554 | const struct io_uring_sqe *sqe) | |
b29472ee | 6555 | { |
9c8e11b3 PB |
6556 | struct io_timeout_rem *tr = &req->timeout_rem; |
6557 | ||
b29472ee JA |
6558 | if (unlikely(req->ctx->flags & IORING_SETUP_IOPOLL)) |
6559 | return -EINVAL; | |
61710e43 DA |
6560 | if (unlikely(req->flags & (REQ_F_FIXED_FILE | REQ_F_BUFFER_SELECT))) |
6561 | return -EINVAL; | |
26578cda | 6562 | if (sqe->ioprio || sqe->buf_index || sqe->len || sqe->splice_fd_in) |
b29472ee JA |
6563 | return -EINVAL; |
6564 | ||
f1042b6c | 6565 | tr->ltimeout = false; |
9c8e11b3 PB |
6566 | tr->addr = READ_ONCE(sqe->addr); |
6567 | tr->flags = READ_ONCE(sqe->timeout_flags); | |
f1042b6c PB |
6568 | if (tr->flags & IORING_TIMEOUT_UPDATE_MASK) { |
6569 | if (hweight32(tr->flags & IORING_TIMEOUT_CLOCK_MASK) > 1) | |
6570 | return -EINVAL; | |
6571 | if (tr->flags & IORING_LINK_TIMEOUT_UPDATE) | |
6572 | tr->ltimeout = true; | |
6573 | if (tr->flags & ~(IORING_TIMEOUT_UPDATE_MASK|IORING_TIMEOUT_ABS)) | |
9c8e11b3 PB |
6574 | return -EINVAL; |
6575 | if (get_timespec64(&tr->ts, u64_to_user_ptr(sqe->addr2))) | |
6576 | return -EFAULT; | |
2087009c YB |
6577 | if (tr->ts.tv_sec < 0 || tr->ts.tv_nsec < 0) |
6578 | return -EINVAL; | |
9c8e11b3 PB |
6579 | } else if (tr->flags) { |
6580 | /* timeout removal doesn't support flags */ | |
b29472ee | 6581 | return -EINVAL; |
9c8e11b3 | 6582 | } |
b29472ee | 6583 | |
b29472ee JA |
6584 | return 0; |
6585 | } | |
6586 | ||
8662daec PB |
6587 | static inline enum hrtimer_mode io_translate_timeout_mode(unsigned int flags) |
6588 | { | |
6589 | return (flags & IORING_TIMEOUT_ABS) ? HRTIMER_MODE_ABS | |
6590 | : HRTIMER_MODE_REL; | |
6591 | } | |
6592 | ||
11365043 JA |
6593 | /* |
6594 | * Remove or update an existing timeout command | |
6595 | */ | |
61e98203 | 6596 | static int io_timeout_remove(struct io_kiocb *req, unsigned int issue_flags) |
11365043 | 6597 | { |
9c8e11b3 | 6598 | struct io_timeout_rem *tr = &req->timeout_rem; |
11365043 | 6599 | struct io_ring_ctx *ctx = req->ctx; |
47f46768 | 6600 | int ret; |
11365043 | 6601 | |
ec3c3d0f PB |
6602 | if (!(req->timeout_rem.flags & IORING_TIMEOUT_UPDATE)) { |
6603 | spin_lock(&ctx->completion_lock); | |
6604 | spin_lock_irq(&ctx->timeout_lock); | |
9c8e11b3 | 6605 | ret = io_timeout_cancel(ctx, tr->addr); |
ec3c3d0f PB |
6606 | spin_unlock_irq(&ctx->timeout_lock); |
6607 | spin_unlock(&ctx->completion_lock); | |
6608 | } else { | |
f1042b6c PB |
6609 | enum hrtimer_mode mode = io_translate_timeout_mode(tr->flags); |
6610 | ||
ec3c3d0f | 6611 | spin_lock_irq(&ctx->timeout_lock); |
f1042b6c PB |
6612 | if (tr->ltimeout) |
6613 | ret = io_linked_timeout_update(ctx, tr->addr, &tr->ts, mode); | |
6614 | else | |
6615 | ret = io_timeout_update(ctx, tr->addr, &tr->ts, mode); | |
ec3c3d0f PB |
6616 | spin_unlock_irq(&ctx->timeout_lock); |
6617 | } | |
11365043 | 6618 | |
4e88d6e7 | 6619 | if (ret < 0) |
93d2bcd2 | 6620 | req_set_fail(req); |
505657bc | 6621 | io_req_complete_post(req, ret, 0); |
11365043 | 6622 | return 0; |
5262f567 JA |
6623 | } |
6624 | ||
3529d8c2 | 6625 | static int io_timeout_prep(struct io_kiocb *req, const struct io_uring_sqe *sqe, |
2d28390a | 6626 | bool is_timeout_link) |
5262f567 | 6627 | { |
ad8a48ac | 6628 | struct io_timeout_data *data; |
a41525ab | 6629 | unsigned flags; |
56080b02 | 6630 | u32 off = READ_ONCE(sqe->off); |
5262f567 | 6631 | |
ad8a48ac | 6632 | if (unlikely(req->ctx->flags & IORING_SETUP_IOPOLL)) |
5262f567 | 6633 | return -EINVAL; |
26578cda PB |
6634 | if (sqe->ioprio || sqe->buf_index || sqe->len != 1 || |
6635 | sqe->splice_fd_in) | |
a41525ab | 6636 | return -EINVAL; |
56080b02 | 6637 | if (off && is_timeout_link) |
2d28390a | 6638 | return -EINVAL; |
a41525ab | 6639 | flags = READ_ONCE(sqe->timeout_flags); |
6224590d PB |
6640 | if (flags & ~(IORING_TIMEOUT_ABS | IORING_TIMEOUT_CLOCK_MASK | |
6641 | IORING_TIMEOUT_ETIME_SUCCESS)) | |
50c1df2b JA |
6642 | return -EINVAL; |
6643 | /* more than one clock specified is invalid, obviously */ | |
6644 | if (hweight32(flags & IORING_TIMEOUT_CLOCK_MASK) > 1) | |
5262f567 | 6645 | return -EINVAL; |
bdf20073 | 6646 | |
ef9dd637 | 6647 | INIT_LIST_HEAD(&req->timeout.list); |
bfe68a22 | 6648 | req->timeout.off = off; |
f18ee4cf PB |
6649 | if (unlikely(off && !req->ctx->off_timeout_used)) |
6650 | req->ctx->off_timeout_used = true; | |
26a61679 | 6651 | |
d6a644a7 PB |
6652 | if (WARN_ON_ONCE(req_has_async_data(req))) |
6653 | return -EFAULT; | |
6654 | if (io_alloc_async_data(req)) | |
26a61679 JA |
6655 | return -ENOMEM; |
6656 | ||
e8c2bc1f | 6657 | data = req->async_data; |
ad8a48ac | 6658 | data->req = req; |
50c1df2b | 6659 | data->flags = flags; |
ad8a48ac JA |
6660 | |
6661 | if (get_timespec64(&data->ts, u64_to_user_ptr(sqe->addr))) | |
5262f567 JA |
6662 | return -EFAULT; |
6663 | ||
f6223ff7 YB |
6664 | if (data->ts.tv_sec < 0 || data->ts.tv_nsec < 0) |
6665 | return -EINVAL; | |
6666 | ||
e677edbc | 6667 | INIT_LIST_HEAD(&req->timeout.list); |
8662daec | 6668 | data->mode = io_translate_timeout_mode(flags); |
50c1df2b | 6669 | hrtimer_init(&data->timer, io_timeout_get_clock(data), data->mode); |
b97e736a PB |
6670 | |
6671 | if (is_timeout_link) { | |
6672 | struct io_submit_link *link = &req->ctx->submit_state.link; | |
6673 | ||
6674 | if (!link->head) | |
6675 | return -EINVAL; | |
6676 | if (link->last->opcode == IORING_OP_LINK_TIMEOUT) | |
6677 | return -EINVAL; | |
4d13d1a4 PB |
6678 | req->timeout.head = link->last; |
6679 | link->last->flags |= REQ_F_ARM_LTIMEOUT; | |
b97e736a | 6680 | } |
ad8a48ac JA |
6681 | return 0; |
6682 | } | |
6683 | ||
61e98203 | 6684 | static int io_timeout(struct io_kiocb *req, unsigned int issue_flags) |
ad8a48ac | 6685 | { |
ad8a48ac | 6686 | struct io_ring_ctx *ctx = req->ctx; |
e8c2bc1f | 6687 | struct io_timeout_data *data = req->async_data; |
ad8a48ac | 6688 | struct list_head *entry; |
bfe68a22 | 6689 | u32 tail, off = req->timeout.off; |
ad8a48ac | 6690 | |
89850fce | 6691 | spin_lock_irq(&ctx->timeout_lock); |
93bd25bb | 6692 | |
5262f567 JA |
6693 | /* |
6694 | * sqe->off holds how many events that need to occur for this | |
93bd25bb JA |
6695 | * timeout event to be satisfied. If it isn't set, then this is |
6696 | * a pure timeout request, sequence isn't used. | |
5262f567 | 6697 | */ |
8eb7e2d0 | 6698 | if (io_is_timeout_noseq(req)) { |
93bd25bb JA |
6699 | entry = ctx->timeout_list.prev; |
6700 | goto add; | |
6701 | } | |
5262f567 | 6702 | |
bfe68a22 PB |
6703 | tail = ctx->cached_cq_tail - atomic_read(&ctx->cq_timeouts); |
6704 | req->timeout.target_seq = tail + off; | |
5262f567 | 6705 | |
f010505b MDG |
6706 | /* Update the last seq here in case io_flush_timeouts() hasn't. |
6707 | * This is safe because ->completion_lock is held, and submissions | |
6708 | * and completions are never mixed in the same ->completion_lock section. | |
6709 | */ | |
6710 | ctx->cq_last_tm_flush = tail; | |
6711 | ||
5262f567 JA |
6712 | /* |
6713 | * Insertion sort, ensuring the first entry in the list is always | |
6714 | * the one we need first. | |
6715 | */ | |
5262f567 | 6716 | list_for_each_prev(entry, &ctx->timeout_list) { |
135fcde8 PB |
6717 | struct io_kiocb *nxt = list_entry(entry, struct io_kiocb, |
6718 | timeout.list); | |
5262f567 | 6719 | |
8eb7e2d0 | 6720 | if (io_is_timeout_noseq(nxt)) |
93bd25bb | 6721 | continue; |
bfe68a22 PB |
6722 | /* nxt.seq is behind @tail, otherwise would've been completed */ |
6723 | if (off >= nxt->timeout.target_seq - tail) | |
5262f567 JA |
6724 | break; |
6725 | } | |
93bd25bb | 6726 | add: |
135fcde8 | 6727 | list_add(&req->timeout.list, entry); |
ad8a48ac JA |
6728 | data->timer.function = io_timeout_fn; |
6729 | hrtimer_start(&data->timer, timespec64_to_ktime(data->ts), data->mode); | |
89850fce | 6730 | spin_unlock_irq(&ctx->timeout_lock); |
5262f567 JA |
6731 | return 0; |
6732 | } | |
5262f567 | 6733 | |
f458dd84 PB |
6734 | struct io_cancel_data { |
6735 | struct io_ring_ctx *ctx; | |
6736 | u64 user_data; | |
6737 | }; | |
6738 | ||
62755e35 JA |
6739 | static bool io_cancel_cb(struct io_wq_work *work, void *data) |
6740 | { | |
6741 | struct io_kiocb *req = container_of(work, struct io_kiocb, work); | |
f458dd84 | 6742 | struct io_cancel_data *cd = data; |
62755e35 | 6743 | |
cef216fc | 6744 | return req->ctx == cd->ctx && req->cqe.user_data == cd->user_data; |
62755e35 JA |
6745 | } |
6746 | ||
f458dd84 PB |
6747 | static int io_async_cancel_one(struct io_uring_task *tctx, u64 user_data, |
6748 | struct io_ring_ctx *ctx) | |
62755e35 | 6749 | { |
f458dd84 | 6750 | struct io_cancel_data data = { .ctx = ctx, .user_data = user_data, }; |
62755e35 | 6751 | enum io_wq_cancel cancel_ret; |
62755e35 JA |
6752 | int ret = 0; |
6753 | ||
f458dd84 | 6754 | if (!tctx || !tctx->io_wq) |
5aa75ed5 JA |
6755 | return -ENOENT; |
6756 | ||
f458dd84 | 6757 | cancel_ret = io_wq_cancel_cb(tctx->io_wq, io_cancel_cb, &data, false); |
62755e35 JA |
6758 | switch (cancel_ret) { |
6759 | case IO_WQ_CANCEL_OK: | |
6760 | ret = 0; | |
6761 | break; | |
6762 | case IO_WQ_CANCEL_RUNNING: | |
6763 | ret = -EALREADY; | |
6764 | break; | |
6765 | case IO_WQ_CANCEL_NOTFOUND: | |
6766 | ret = -ENOENT; | |
6767 | break; | |
6768 | } | |
6769 | ||
e977d6d3 JA |
6770 | return ret; |
6771 | } | |
6772 | ||
8cb01fac | 6773 | static int io_try_cancel_userdata(struct io_kiocb *req, u64 sqe_addr) |
47f46768 | 6774 | { |
8cb01fac | 6775 | struct io_ring_ctx *ctx = req->ctx; |
47f46768 JA |
6776 | int ret; |
6777 | ||
dadebc35 | 6778 | WARN_ON_ONCE(!io_wq_current_is_worker() && req->task != current); |
8cb01fac | 6779 | |
f458dd84 | 6780 | ret = io_async_cancel_one(req->task->io_uring, sqe_addr, ctx); |
ccbf7261 JA |
6781 | /* |
6782 | * Fall-through even for -EALREADY, as we may have poll armed | |
6783 | * that need unarming. | |
6784 | */ | |
6785 | if (!ret) | |
6786 | return 0; | |
505657bc PB |
6787 | |
6788 | spin_lock(&ctx->completion_lock); | |
ccbf7261 JA |
6789 | ret = io_poll_cancel(ctx, sqe_addr, false); |
6790 | if (ret != -ENOENT) | |
6791 | goto out; | |
6792 | ||
79ebeaee | 6793 | spin_lock_irq(&ctx->timeout_lock); |
47f46768 | 6794 | ret = io_timeout_cancel(ctx, sqe_addr); |
79ebeaee | 6795 | spin_unlock_irq(&ctx->timeout_lock); |
505657bc PB |
6796 | out: |
6797 | spin_unlock(&ctx->completion_lock); | |
6798 | return ret; | |
47f46768 JA |
6799 | } |
6800 | ||
3529d8c2 JA |
6801 | static int io_async_cancel_prep(struct io_kiocb *req, |
6802 | const struct io_uring_sqe *sqe) | |
e977d6d3 | 6803 | { |
fbf23849 | 6804 | if (unlikely(req->ctx->flags & IORING_SETUP_IOPOLL)) |
e977d6d3 | 6805 | return -EINVAL; |
61710e43 DA |
6806 | if (unlikely(req->flags & (REQ_F_FIXED_FILE | REQ_F_BUFFER_SELECT))) |
6807 | return -EINVAL; | |
26578cda PB |
6808 | if (sqe->ioprio || sqe->off || sqe->len || sqe->cancel_flags || |
6809 | sqe->splice_fd_in) | |
e977d6d3 JA |
6810 | return -EINVAL; |
6811 | ||
fbf23849 JA |
6812 | req->cancel.addr = READ_ONCE(sqe->addr); |
6813 | return 0; | |
6814 | } | |
6815 | ||
61e98203 | 6816 | static int io_async_cancel(struct io_kiocb *req, unsigned int issue_flags) |
fbf23849 JA |
6817 | { |
6818 | struct io_ring_ctx *ctx = req->ctx; | |
58f99373 PB |
6819 | u64 sqe_addr = req->cancel.addr; |
6820 | struct io_tctx_node *node; | |
6821 | int ret; | |
6822 | ||
8cb01fac | 6823 | ret = io_try_cancel_userdata(req, sqe_addr); |
58f99373 PB |
6824 | if (ret != -ENOENT) |
6825 | goto done; | |
58f99373 PB |
6826 | |
6827 | /* slow path, try all io-wq's */ | |
f8929630 | 6828 | io_ring_submit_lock(ctx, issue_flags); |
58f99373 PB |
6829 | ret = -ENOENT; |
6830 | list_for_each_entry(node, &ctx->tctx_list, ctx_node) { | |
6831 | struct io_uring_task *tctx = node->task->io_uring; | |
fbf23849 | 6832 | |
58f99373 PB |
6833 | ret = io_async_cancel_one(tctx, req->cancel.addr, ctx); |
6834 | if (ret != -ENOENT) | |
6835 | break; | |
6836 | } | |
f8929630 | 6837 | io_ring_submit_unlock(ctx, issue_flags); |
58f99373 | 6838 | done: |
58f99373 | 6839 | if (ret < 0) |
93d2bcd2 | 6840 | req_set_fail(req); |
505657bc | 6841 | io_req_complete_post(req, ret, 0); |
5262f567 JA |
6842 | return 0; |
6843 | } | |
6844 | ||
269bbe5f | 6845 | static int io_rsrc_update_prep(struct io_kiocb *req, |
05f3fb3c JA |
6846 | const struct io_uring_sqe *sqe) |
6847 | { | |
61710e43 DA |
6848 | if (unlikely(req->flags & (REQ_F_FIXED_FILE | REQ_F_BUFFER_SELECT))) |
6849 | return -EINVAL; | |
26578cda | 6850 | if (sqe->ioprio || sqe->rw_flags || sqe->splice_fd_in) |
05f3fb3c JA |
6851 | return -EINVAL; |
6852 | ||
269bbe5f BM |
6853 | req->rsrc_update.offset = READ_ONCE(sqe->off); |
6854 | req->rsrc_update.nr_args = READ_ONCE(sqe->len); | |
6855 | if (!req->rsrc_update.nr_args) | |
05f3fb3c | 6856 | return -EINVAL; |
269bbe5f | 6857 | req->rsrc_update.arg = READ_ONCE(sqe->addr); |
05f3fb3c JA |
6858 | return 0; |
6859 | } | |
6860 | ||
889fca73 | 6861 | static int io_files_update(struct io_kiocb *req, unsigned int issue_flags) |
fbf23849 JA |
6862 | { |
6863 | struct io_ring_ctx *ctx = req->ctx; | |
c3bdad02 | 6864 | struct io_uring_rsrc_update2 up; |
05f3fb3c | 6865 | int ret; |
fbf23849 | 6866 | |
269bbe5f BM |
6867 | up.offset = req->rsrc_update.offset; |
6868 | up.data = req->rsrc_update.arg; | |
c3bdad02 PB |
6869 | up.nr = 0; |
6870 | up.tags = 0; | |
615cee49 | 6871 | up.resv = 0; |
d8a3ba9c | 6872 | up.resv2 = 0; |
05f3fb3c | 6873 | |
f8929630 | 6874 | io_ring_submit_lock(ctx, issue_flags); |
fdecb662 | 6875 | ret = __io_register_rsrc_update(ctx, IORING_RSRC_FILE, |
98f0b3b4 | 6876 | &up, req->rsrc_update.nr_args); |
f8929630 | 6877 | io_ring_submit_unlock(ctx, issue_flags); |
05f3fb3c JA |
6878 | |
6879 | if (ret < 0) | |
93d2bcd2 | 6880 | req_set_fail(req); |
889fca73 | 6881 | __io_req_complete(req, issue_flags, ret, 0); |
5262f567 JA |
6882 | return 0; |
6883 | } | |
6884 | ||
bfe76559 | 6885 | static int io_req_prep(struct io_kiocb *req, const struct io_uring_sqe *sqe) |
f67676d1 | 6886 | { |
d625c6ee | 6887 | switch (req->opcode) { |
e781573e | 6888 | case IORING_OP_NOP: |
bfe76559 | 6889 | return 0; |
f67676d1 JA |
6890 | case IORING_OP_READV: |
6891 | case IORING_OP_READ_FIXED: | |
3a6820f2 | 6892 | case IORING_OP_READ: |
f67676d1 JA |
6893 | case IORING_OP_WRITEV: |
6894 | case IORING_OP_WRITE_FIXED: | |
3a6820f2 | 6895 | case IORING_OP_WRITE: |
584b0180 | 6896 | return io_prep_rw(req, sqe); |
0969e783 | 6897 | case IORING_OP_POLL_ADD: |
bfe76559 | 6898 | return io_poll_add_prep(req, sqe); |
0969e783 | 6899 | case IORING_OP_POLL_REMOVE: |
c5de0036 | 6900 | return io_poll_update_prep(req, sqe); |
8ed8d3c3 | 6901 | case IORING_OP_FSYNC: |
1155c76a | 6902 | return io_fsync_prep(req, sqe); |
8ed8d3c3 | 6903 | case IORING_OP_SYNC_FILE_RANGE: |
1155c76a | 6904 | return io_sfr_prep(req, sqe); |
03b1230c | 6905 | case IORING_OP_SENDMSG: |
fddaface | 6906 | case IORING_OP_SEND: |
bfe76559 | 6907 | return io_sendmsg_prep(req, sqe); |
03b1230c | 6908 | case IORING_OP_RECVMSG: |
fddaface | 6909 | case IORING_OP_RECV: |
bfe76559 | 6910 | return io_recvmsg_prep(req, sqe); |
f499a021 | 6911 | case IORING_OP_CONNECT: |
bfe76559 | 6912 | return io_connect_prep(req, sqe); |
2d28390a | 6913 | case IORING_OP_TIMEOUT: |
bfe76559 | 6914 | return io_timeout_prep(req, sqe, false); |
b29472ee | 6915 | case IORING_OP_TIMEOUT_REMOVE: |
bfe76559 | 6916 | return io_timeout_remove_prep(req, sqe); |
fbf23849 | 6917 | case IORING_OP_ASYNC_CANCEL: |
bfe76559 | 6918 | return io_async_cancel_prep(req, sqe); |
2d28390a | 6919 | case IORING_OP_LINK_TIMEOUT: |
bfe76559 | 6920 | return io_timeout_prep(req, sqe, true); |
8ed8d3c3 | 6921 | case IORING_OP_ACCEPT: |
bfe76559 | 6922 | return io_accept_prep(req, sqe); |
d63d1b5e | 6923 | case IORING_OP_FALLOCATE: |
bfe76559 | 6924 | return io_fallocate_prep(req, sqe); |
15b71abe | 6925 | case IORING_OP_OPENAT: |
bfe76559 | 6926 | return io_openat_prep(req, sqe); |
b5dba59e | 6927 | case IORING_OP_CLOSE: |
bfe76559 | 6928 | return io_close_prep(req, sqe); |
05f3fb3c | 6929 | case IORING_OP_FILES_UPDATE: |
269bbe5f | 6930 | return io_rsrc_update_prep(req, sqe); |
eddc7ef5 | 6931 | case IORING_OP_STATX: |
bfe76559 | 6932 | return io_statx_prep(req, sqe); |
4840e418 | 6933 | case IORING_OP_FADVISE: |
bfe76559 | 6934 | return io_fadvise_prep(req, sqe); |
c1ca757b | 6935 | case IORING_OP_MADVISE: |
bfe76559 | 6936 | return io_madvise_prep(req, sqe); |
cebdb986 | 6937 | case IORING_OP_OPENAT2: |
bfe76559 | 6938 | return io_openat2_prep(req, sqe); |
3e4827b0 | 6939 | case IORING_OP_EPOLL_CTL: |
bfe76559 | 6940 | return io_epoll_ctl_prep(req, sqe); |
7d67af2c | 6941 | case IORING_OP_SPLICE: |
bfe76559 | 6942 | return io_splice_prep(req, sqe); |
ddf0322d | 6943 | case IORING_OP_PROVIDE_BUFFERS: |
bfe76559 | 6944 | return io_provide_buffers_prep(req, sqe); |
067524e9 | 6945 | case IORING_OP_REMOVE_BUFFERS: |
bfe76559 | 6946 | return io_remove_buffers_prep(req, sqe); |
f2a8d5c7 | 6947 | case IORING_OP_TEE: |
bfe76559 | 6948 | return io_tee_prep(req, sqe); |
36f4fa68 JA |
6949 | case IORING_OP_SHUTDOWN: |
6950 | return io_shutdown_prep(req, sqe); | |
80a261fd JA |
6951 | case IORING_OP_RENAMEAT: |
6952 | return io_renameat_prep(req, sqe); | |
14a1143b JA |
6953 | case IORING_OP_UNLINKAT: |
6954 | return io_unlinkat_prep(req, sqe); | |
e34a02dc DK |
6955 | case IORING_OP_MKDIRAT: |
6956 | return io_mkdirat_prep(req, sqe); | |
7a8721f8 DK |
6957 | case IORING_OP_SYMLINKAT: |
6958 | return io_symlinkat_prep(req, sqe); | |
cf30da90 DK |
6959 | case IORING_OP_LINKAT: |
6960 | return io_linkat_prep(req, sqe); | |
4f57f06c JA |
6961 | case IORING_OP_MSG_RING: |
6962 | return io_msg_ring_prep(req, sqe); | |
f67676d1 JA |
6963 | } |
6964 | ||
bfe76559 PB |
6965 | printk_once(KERN_WARNING "io_uring: unhandled opcode %d\n", |
6966 | req->opcode); | |
bd54b6fe | 6967 | return -EINVAL; |
bfe76559 PB |
6968 | } |
6969 | ||
93642ef8 | 6970 | static int io_req_prep_async(struct io_kiocb *req) |
bfe76559 | 6971 | { |
b7e298d2 PB |
6972 | if (!io_op_defs[req->opcode].needs_async_setup) |
6973 | return 0; | |
d886e185 | 6974 | if (WARN_ON_ONCE(req_has_async_data(req))) |
b7e298d2 PB |
6975 | return -EFAULT; |
6976 | if (io_alloc_async_data(req)) | |
6977 | return -EAGAIN; | |
6978 | ||
93642ef8 PB |
6979 | switch (req->opcode) { |
6980 | case IORING_OP_READV: | |
93642ef8 PB |
6981 | return io_rw_prep_async(req, READ); |
6982 | case IORING_OP_WRITEV: | |
93642ef8 PB |
6983 | return io_rw_prep_async(req, WRITE); |
6984 | case IORING_OP_SENDMSG: | |
93642ef8 PB |
6985 | return io_sendmsg_prep_async(req); |
6986 | case IORING_OP_RECVMSG: | |
93642ef8 PB |
6987 | return io_recvmsg_prep_async(req); |
6988 | case IORING_OP_CONNECT: | |
6989 | return io_connect_prep_async(req); | |
6990 | } | |
b7e298d2 PB |
6991 | printk_once(KERN_WARNING "io_uring: prep_async() bad opcode %d\n", |
6992 | req->opcode); | |
6993 | return -EFAULT; | |
f67676d1 JA |
6994 | } |
6995 | ||
9cf7c104 PB |
6996 | static u32 io_get_sequence(struct io_kiocb *req) |
6997 | { | |
a3dbdf54 | 6998 | u32 seq = req->ctx->cached_sq_head; |
963c6abb | 6999 | struct io_kiocb *cur; |
9cf7c104 | 7000 | |
a3dbdf54 | 7001 | /* need original cached_sq_head, but it was increased for each req */ |
963c6abb | 7002 | io_for_each_link(cur, req) |
a3dbdf54 PB |
7003 | seq--; |
7004 | return seq; | |
9cf7c104 PB |
7005 | } |
7006 | ||
c072481d | 7007 | static __cold void io_drain_req(struct io_kiocb *req) |
de0617e4 | 7008 | { |
a197f664 | 7009 | struct io_ring_ctx *ctx = req->ctx; |
27dc8338 | 7010 | struct io_defer_entry *de; |
f67676d1 | 7011 | int ret; |
e0eb71dc | 7012 | u32 seq = io_get_sequence(req); |
3c19966d | 7013 | |
9d858b21 | 7014 | /* Still need defer if there is pending req in defer list. */ |
e302f104 | 7015 | spin_lock(&ctx->completion_lock); |
5e371265 | 7016 | if (!req_need_defer(req, seq) && list_empty_careful(&ctx->defer_list)) { |
e302f104 | 7017 | spin_unlock(&ctx->completion_lock); |
e0eb71dc | 7018 | queue: |
10c66904 | 7019 | ctx->drain_active = false; |
e0eb71dc PB |
7020 | io_req_task_queue(req); |
7021 | return; | |
10c66904 | 7022 | } |
e302f104 | 7023 | spin_unlock(&ctx->completion_lock); |
9cf7c104 | 7024 | |
b7e298d2 | 7025 | ret = io_req_prep_async(req); |
e0eb71dc PB |
7026 | if (ret) { |
7027 | fail: | |
7028 | io_req_complete_failed(req, ret); | |
7029 | return; | |
7030 | } | |
cbdcb435 | 7031 | io_prep_async_link(req); |
27dc8338 | 7032 | de = kmalloc(sizeof(*de), GFP_KERNEL); |
76cc33d7 | 7033 | if (!de) { |
1b48773f | 7034 | ret = -ENOMEM; |
e0eb71dc | 7035 | goto fail; |
76cc33d7 | 7036 | } |
2d28390a | 7037 | |
79ebeaee | 7038 | spin_lock(&ctx->completion_lock); |
9cf7c104 | 7039 | if (!req_need_defer(req, seq) && list_empty(&ctx->defer_list)) { |
79ebeaee | 7040 | spin_unlock(&ctx->completion_lock); |
27dc8338 | 7041 | kfree(de); |
e0eb71dc | 7042 | goto queue; |
de0617e4 JA |
7043 | } |
7044 | ||
cef216fc | 7045 | trace_io_uring_defer(ctx, req, req->cqe.user_data, req->opcode); |
27dc8338 | 7046 | de->req = req; |
9cf7c104 | 7047 | de->seq = seq; |
27dc8338 | 7048 | list_add_tail(&de->list, &ctx->defer_list); |
79ebeaee | 7049 | spin_unlock(&ctx->completion_lock); |
de0617e4 JA |
7050 | } |
7051 | ||
68fb8979 | 7052 | static void io_clean_op(struct io_kiocb *req) |
99bc4c38 | 7053 | { |
8197b053 PB |
7054 | if (req->flags & REQ_F_BUFFER_SELECTED) { |
7055 | spin_lock(&req->ctx->completion_lock); | |
cc3cec83 | 7056 | io_put_kbuf_comp(req); |
8197b053 PB |
7057 | spin_unlock(&req->ctx->completion_lock); |
7058 | } | |
99bc4c38 | 7059 | |
0e1b6fe3 PB |
7060 | if (req->flags & REQ_F_NEED_CLEANUP) { |
7061 | switch (req->opcode) { | |
7062 | case IORING_OP_READV: | |
7063 | case IORING_OP_READ_FIXED: | |
7064 | case IORING_OP_READ: | |
7065 | case IORING_OP_WRITEV: | |
7066 | case IORING_OP_WRITE_FIXED: | |
e8c2bc1f JA |
7067 | case IORING_OP_WRITE: { |
7068 | struct io_async_rw *io = req->async_data; | |
1dacb4df PB |
7069 | |
7070 | kfree(io->free_iovec); | |
0e1b6fe3 | 7071 | break; |
e8c2bc1f | 7072 | } |
0e1b6fe3 | 7073 | case IORING_OP_RECVMSG: |
e8c2bc1f JA |
7074 | case IORING_OP_SENDMSG: { |
7075 | struct io_async_msghdr *io = req->async_data; | |
257e84a5 PB |
7076 | |
7077 | kfree(io->free_iov); | |
0e1b6fe3 | 7078 | break; |
e8c2bc1f | 7079 | } |
f3cd4850 JA |
7080 | case IORING_OP_OPENAT: |
7081 | case IORING_OP_OPENAT2: | |
7082 | if (req->open.filename) | |
7083 | putname(req->open.filename); | |
7084 | break; | |
80a261fd JA |
7085 | case IORING_OP_RENAMEAT: |
7086 | putname(req->rename.oldpath); | |
7087 | putname(req->rename.newpath); | |
7088 | break; | |
14a1143b JA |
7089 | case IORING_OP_UNLINKAT: |
7090 | putname(req->unlink.filename); | |
7091 | break; | |
e34a02dc DK |
7092 | case IORING_OP_MKDIRAT: |
7093 | putname(req->mkdir.filename); | |
7094 | break; | |
7a8721f8 DK |
7095 | case IORING_OP_SYMLINKAT: |
7096 | putname(req->symlink.oldpath); | |
7097 | putname(req->symlink.newpath); | |
7098 | break; | |
cf30da90 DK |
7099 | case IORING_OP_LINKAT: |
7100 | putname(req->hardlink.oldpath); | |
7101 | putname(req->hardlink.newpath); | |
7102 | break; | |
1b6fe6e0 SR |
7103 | case IORING_OP_STATX: |
7104 | if (req->statx.filename) | |
7105 | putname(req->statx.filename); | |
7106 | break; | |
0e1b6fe3 | 7107 | } |
99bc4c38 | 7108 | } |
75652a30 JA |
7109 | if ((req->flags & REQ_F_POLLED) && req->apoll) { |
7110 | kfree(req->apoll->double_poll); | |
7111 | kfree(req->apoll); | |
7112 | req->apoll = NULL; | |
7113 | } | |
c854357b | 7114 | if (req->flags & REQ_F_CREDS) |
b8e64b53 | 7115 | put_cred(req->creds); |
d886e185 PB |
7116 | if (req->flags & REQ_F_ASYNC_DATA) { |
7117 | kfree(req->async_data); | |
7118 | req->async_data = NULL; | |
7119 | } | |
c854357b | 7120 | req->flags &= ~IO_REQ_CLEAN_FLAGS; |
99bc4c38 PB |
7121 | } |
7122 | ||
6bf9c47a JA |
7123 | static bool io_assign_file(struct io_kiocb *req, unsigned int issue_flags) |
7124 | { | |
7125 | if (req->file || !io_op_defs[req->opcode].needs_file) | |
7126 | return true; | |
7127 | ||
7128 | if (req->flags & REQ_F_FIXED_FILE) | |
cef216fc | 7129 | req->file = io_file_get_fixed(req, req->cqe.fd, issue_flags); |
6bf9c47a | 7130 | else |
cef216fc | 7131 | req->file = io_file_get_normal(req, req->cqe.fd); |
6bf9c47a JA |
7132 | if (req->file) |
7133 | return true; | |
7134 | ||
7135 | req_set_fail(req); | |
cef216fc | 7136 | req->cqe.res = -EBADF; |
6bf9c47a JA |
7137 | return false; |
7138 | } | |
7139 | ||
889fca73 | 7140 | static int io_issue_sqe(struct io_kiocb *req, unsigned int issue_flags) |
2b188cc1 | 7141 | { |
5730b27e | 7142 | const struct cred *creds = NULL; |
d625c6ee | 7143 | int ret; |
2b188cc1 | 7144 | |
70152140 JA |
7145 | if (unlikely(!io_assign_file(req, issue_flags))) |
7146 | return -EBADF; | |
7147 | ||
6878b40e | 7148 | if (unlikely((req->flags & REQ_F_CREDS) && req->creds != current_cred())) |
c10d1f98 | 7149 | creds = override_creds(req->creds); |
5730b27e | 7150 | |
5bd2182d PM |
7151 | if (!io_op_defs[req->opcode].audit_skip) |
7152 | audit_uring_entry(req->opcode); | |
7153 | ||
d625c6ee | 7154 | switch (req->opcode) { |
2b188cc1 | 7155 | case IORING_OP_NOP: |
889fca73 | 7156 | ret = io_nop(req, issue_flags); |
2b188cc1 JA |
7157 | break; |
7158 | case IORING_OP_READV: | |
edafccee | 7159 | case IORING_OP_READ_FIXED: |
3a6820f2 | 7160 | case IORING_OP_READ: |
889fca73 | 7161 | ret = io_read(req, issue_flags); |
edafccee | 7162 | break; |
3529d8c2 | 7163 | case IORING_OP_WRITEV: |
edafccee | 7164 | case IORING_OP_WRITE_FIXED: |
3a6820f2 | 7165 | case IORING_OP_WRITE: |
889fca73 | 7166 | ret = io_write(req, issue_flags); |
2b188cc1 | 7167 | break; |
c992fe29 | 7168 | case IORING_OP_FSYNC: |
45d189c6 | 7169 | ret = io_fsync(req, issue_flags); |
c992fe29 | 7170 | break; |
221c5eb2 | 7171 | case IORING_OP_POLL_ADD: |
61e98203 | 7172 | ret = io_poll_add(req, issue_flags); |
221c5eb2 JA |
7173 | break; |
7174 | case IORING_OP_POLL_REMOVE: | |
c5de0036 | 7175 | ret = io_poll_update(req, issue_flags); |
221c5eb2 | 7176 | break; |
5d17b4a4 | 7177 | case IORING_OP_SYNC_FILE_RANGE: |
45d189c6 | 7178 | ret = io_sync_file_range(req, issue_flags); |
5d17b4a4 | 7179 | break; |
0fa03c62 | 7180 | case IORING_OP_SENDMSG: |
889fca73 | 7181 | ret = io_sendmsg(req, issue_flags); |
062d04d7 | 7182 | break; |
fddaface | 7183 | case IORING_OP_SEND: |
889fca73 | 7184 | ret = io_send(req, issue_flags); |
0fa03c62 | 7185 | break; |
aa1fa28f | 7186 | case IORING_OP_RECVMSG: |
889fca73 | 7187 | ret = io_recvmsg(req, issue_flags); |
062d04d7 | 7188 | break; |
fddaface | 7189 | case IORING_OP_RECV: |
889fca73 | 7190 | ret = io_recv(req, issue_flags); |
aa1fa28f | 7191 | break; |
5262f567 | 7192 | case IORING_OP_TIMEOUT: |
61e98203 | 7193 | ret = io_timeout(req, issue_flags); |
5262f567 | 7194 | break; |
11365043 | 7195 | case IORING_OP_TIMEOUT_REMOVE: |
61e98203 | 7196 | ret = io_timeout_remove(req, issue_flags); |
11365043 | 7197 | break; |
17f2fe35 | 7198 | case IORING_OP_ACCEPT: |
889fca73 | 7199 | ret = io_accept(req, issue_flags); |
17f2fe35 | 7200 | break; |
f8e85cf2 | 7201 | case IORING_OP_CONNECT: |
889fca73 | 7202 | ret = io_connect(req, issue_flags); |
f8e85cf2 | 7203 | break; |
62755e35 | 7204 | case IORING_OP_ASYNC_CANCEL: |
61e98203 | 7205 | ret = io_async_cancel(req, issue_flags); |
62755e35 | 7206 | break; |
d63d1b5e | 7207 | case IORING_OP_FALLOCATE: |
45d189c6 | 7208 | ret = io_fallocate(req, issue_flags); |
d63d1b5e | 7209 | break; |
15b71abe | 7210 | case IORING_OP_OPENAT: |
45d189c6 | 7211 | ret = io_openat(req, issue_flags); |
15b71abe | 7212 | break; |
b5dba59e | 7213 | case IORING_OP_CLOSE: |
889fca73 | 7214 | ret = io_close(req, issue_flags); |
b5dba59e | 7215 | break; |
05f3fb3c | 7216 | case IORING_OP_FILES_UPDATE: |
889fca73 | 7217 | ret = io_files_update(req, issue_flags); |
05f3fb3c | 7218 | break; |
eddc7ef5 | 7219 | case IORING_OP_STATX: |
45d189c6 | 7220 | ret = io_statx(req, issue_flags); |
eddc7ef5 | 7221 | break; |
4840e418 | 7222 | case IORING_OP_FADVISE: |
45d189c6 | 7223 | ret = io_fadvise(req, issue_flags); |
4840e418 | 7224 | break; |
c1ca757b | 7225 | case IORING_OP_MADVISE: |
45d189c6 | 7226 | ret = io_madvise(req, issue_flags); |
c1ca757b | 7227 | break; |
cebdb986 | 7228 | case IORING_OP_OPENAT2: |
45d189c6 | 7229 | ret = io_openat2(req, issue_flags); |
cebdb986 | 7230 | break; |
3e4827b0 | 7231 | case IORING_OP_EPOLL_CTL: |
889fca73 | 7232 | ret = io_epoll_ctl(req, issue_flags); |
3e4827b0 | 7233 | break; |
7d67af2c | 7234 | case IORING_OP_SPLICE: |
45d189c6 | 7235 | ret = io_splice(req, issue_flags); |
7d67af2c | 7236 | break; |
ddf0322d | 7237 | case IORING_OP_PROVIDE_BUFFERS: |
889fca73 | 7238 | ret = io_provide_buffers(req, issue_flags); |
ddf0322d | 7239 | break; |
067524e9 | 7240 | case IORING_OP_REMOVE_BUFFERS: |
889fca73 | 7241 | ret = io_remove_buffers(req, issue_flags); |
3e4827b0 | 7242 | break; |
f2a8d5c7 | 7243 | case IORING_OP_TEE: |
45d189c6 | 7244 | ret = io_tee(req, issue_flags); |
f2a8d5c7 | 7245 | break; |
36f4fa68 | 7246 | case IORING_OP_SHUTDOWN: |
45d189c6 | 7247 | ret = io_shutdown(req, issue_flags); |
36f4fa68 | 7248 | break; |
80a261fd | 7249 | case IORING_OP_RENAMEAT: |
45d189c6 | 7250 | ret = io_renameat(req, issue_flags); |
80a261fd | 7251 | break; |
14a1143b | 7252 | case IORING_OP_UNLINKAT: |
45d189c6 | 7253 | ret = io_unlinkat(req, issue_flags); |
14a1143b | 7254 | break; |
e34a02dc DK |
7255 | case IORING_OP_MKDIRAT: |
7256 | ret = io_mkdirat(req, issue_flags); | |
7257 | break; | |
7a8721f8 DK |
7258 | case IORING_OP_SYMLINKAT: |
7259 | ret = io_symlinkat(req, issue_flags); | |
7260 | break; | |
cf30da90 DK |
7261 | case IORING_OP_LINKAT: |
7262 | ret = io_linkat(req, issue_flags); | |
7263 | break; | |
4f57f06c JA |
7264 | case IORING_OP_MSG_RING: |
7265 | ret = io_msg_ring(req, issue_flags); | |
7266 | break; | |
2b188cc1 JA |
7267 | default: |
7268 | ret = -EINVAL; | |
7269 | break; | |
7270 | } | |
7271 | ||
5bd2182d PM |
7272 | if (!io_op_defs[req->opcode].audit_skip) |
7273 | audit_uring_exit(!ret, ret); | |
7274 | ||
5730b27e JA |
7275 | if (creds) |
7276 | revert_creds(creds); | |
def596e9 JA |
7277 | if (ret) |
7278 | return ret; | |
b532576e | 7279 | /* If the op doesn't have a file, we're not polling for it */ |
9983028e | 7280 | if ((req->ctx->flags & IORING_SETUP_IOPOLL) && req->file) |
9882131c | 7281 | io_iopoll_req_issued(req, issue_flags); |
def596e9 JA |
7282 | |
7283 | return 0; | |
2b188cc1 JA |
7284 | } |
7285 | ||
ebc11b6c PB |
7286 | static struct io_wq_work *io_wq_free_work(struct io_wq_work *work) |
7287 | { | |
7288 | struct io_kiocb *req = container_of(work, struct io_kiocb, work); | |
7289 | ||
7290 | req = io_put_req_find_next(req); | |
7291 | return req ? &req->work : NULL; | |
7292 | } | |
7293 | ||
5280f7e5 | 7294 | static void io_wq_submit_work(struct io_wq_work *work) |
2b188cc1 JA |
7295 | { |
7296 | struct io_kiocb *req = container_of(work, struct io_kiocb, work); | |
6bf9c47a | 7297 | const struct io_op_def *def = &io_op_defs[req->opcode]; |
d01905db PB |
7298 | unsigned int issue_flags = IO_URING_F_UNLOCKED; |
7299 | bool needs_poll = false; | |
6df1db6b | 7300 | struct io_kiocb *timeout; |
6bf9c47a | 7301 | int ret = 0, err = -ECANCELED; |
2b188cc1 | 7302 | |
48dcd38d PB |
7303 | /* one will be dropped by ->io_free_work() after returning to io-wq */ |
7304 | if (!(req->flags & REQ_F_REFCOUNT)) | |
7305 | __io_req_set_refcount(req, 2); | |
7306 | else | |
7307 | req_ref_get(req); | |
5d5901a3 | 7308 | |
6df1db6b PB |
7309 | timeout = io_prep_linked_timeout(req); |
7310 | if (timeout) | |
7311 | io_queue_linked_timeout(timeout); | |
d4c81f38 | 7312 | |
6bf9c47a | 7313 | |
dadebc35 | 7314 | /* either cancelled or io-wq is dying, so don't touch tctx->iowq */ |
d01905db | 7315 | if (work->flags & IO_WQ_WORK_CANCEL) { |
0f8da75b | 7316 | fail: |
6bf9c47a | 7317 | io_req_task_queue_fail(req, err); |
d01905db PB |
7318 | return; |
7319 | } | |
0f8da75b PB |
7320 | if (!io_assign_file(req, issue_flags)) { |
7321 | err = -EBADF; | |
7322 | work->flags |= IO_WQ_WORK_CANCEL; | |
7323 | goto fail; | |
7324 | } | |
31b51510 | 7325 | |
d01905db | 7326 | if (req->flags & REQ_F_FORCE_ASYNC) { |
afb7f56f PB |
7327 | bool opcode_poll = def->pollin || def->pollout; |
7328 | ||
7329 | if (opcode_poll && file_can_poll(req->file)) { | |
7330 | needs_poll = true; | |
d01905db | 7331 | issue_flags |= IO_URING_F_NONBLOCK; |
afb7f56f | 7332 | } |
561fb04a | 7333 | } |
31b51510 | 7334 | |
d01905db PB |
7335 | do { |
7336 | ret = io_issue_sqe(req, issue_flags); | |
7337 | if (ret != -EAGAIN) | |
7338 | break; | |
7339 | /* | |
7340 | * We can get EAGAIN for iopolled IO even though we're | |
7341 | * forcing a sync submission from here, since we can't | |
7342 | * wait for request slots on the block side. | |
7343 | */ | |
7344 | if (!needs_poll) { | |
7345 | cond_resched(); | |
7346 | continue; | |
90fa0288 HX |
7347 | } |
7348 | ||
4d9237e3 | 7349 | if (io_arm_poll_handler(req, issue_flags) == IO_APOLL_OK) |
d01905db PB |
7350 | return; |
7351 | /* aborted or ready, in either case retry blocking */ | |
7352 | needs_poll = false; | |
7353 | issue_flags &= ~IO_URING_F_NONBLOCK; | |
7354 | } while (1); | |
31b51510 | 7355 | |
a3df7698 | 7356 | /* avoid locking problems by failing it from a clean context */ |
5d5901a3 | 7357 | if (ret) |
a3df7698 | 7358 | io_req_task_queue_fail(req, ret); |
2b188cc1 JA |
7359 | } |
7360 | ||
aeca241b | 7361 | static inline struct io_fixed_file *io_fixed_file_slot(struct io_file_table *table, |
042b0d85 | 7362 | unsigned i) |
65e19f54 | 7363 | { |
042b0d85 | 7364 | return &table->files[i]; |
dafecf19 PB |
7365 | } |
7366 | ||
65e19f54 JA |
7367 | static inline struct file *io_file_from_index(struct io_ring_ctx *ctx, |
7368 | int index) | |
7369 | { | |
aeca241b | 7370 | struct io_fixed_file *slot = io_fixed_file_slot(&ctx->file_table, index); |
65e19f54 | 7371 | |
a04b0ac0 | 7372 | return (struct file *) (slot->file_ptr & FFS_MASK); |
65e19f54 JA |
7373 | } |
7374 | ||
a04b0ac0 | 7375 | static void io_fixed_file_set(struct io_fixed_file *file_slot, struct file *file) |
9a321c98 PB |
7376 | { |
7377 | unsigned long file_ptr = (unsigned long) file; | |
7378 | ||
88459b50 | 7379 | file_ptr |= io_file_get_flags(file); |
a04b0ac0 | 7380 | file_slot->file_ptr = file_ptr; |
65e19f54 JA |
7381 | } |
7382 | ||
5106dd6e JA |
7383 | static inline struct file *io_file_get_fixed(struct io_kiocb *req, int fd, |
7384 | unsigned int issue_flags) | |
09bb8394 | 7385 | { |
5106dd6e JA |
7386 | struct io_ring_ctx *ctx = req->ctx; |
7387 | struct file *file = NULL; | |
ac177053 | 7388 | unsigned long file_ptr; |
09bb8394 | 7389 | |
5106dd6e JA |
7390 | if (issue_flags & IO_URING_F_UNLOCKED) |
7391 | mutex_lock(&ctx->uring_lock); | |
7392 | ||
ac177053 | 7393 | if (unlikely((unsigned int)fd >= ctx->nr_user_files)) |
5106dd6e | 7394 | goto out; |
ac177053 PB |
7395 | fd = array_index_nospec(fd, ctx->nr_user_files); |
7396 | file_ptr = io_fixed_file_slot(&ctx->file_table, fd)->file_ptr; | |
7397 | file = (struct file *) (file_ptr & FFS_MASK); | |
7398 | file_ptr &= ~FFS_MASK; | |
7399 | /* mask in overlapping REQ_F and FFS bits */ | |
35645ac3 | 7400 | req->flags |= (file_ptr << REQ_F_SUPPORT_NOWAIT_BIT); |
5106dd6e JA |
7401 | io_req_set_rsrc_node(req, ctx, 0); |
7402 | out: | |
7403 | if (issue_flags & IO_URING_F_UNLOCKED) | |
7404 | mutex_unlock(&ctx->uring_lock); | |
ac177053 PB |
7405 | return file; |
7406 | } | |
d44f554e | 7407 | |
d5361233 JA |
7408 | /* |
7409 | * Drop the file for requeue operations. Only used of req->file is the | |
7410 | * io_uring descriptor itself. | |
7411 | */ | |
7412 | static void io_drop_inflight_file(struct io_kiocb *req) | |
7413 | { | |
7414 | if (unlikely(req->flags & REQ_F_INFLIGHT)) { | |
7415 | fput(req->file); | |
7416 | req->file = NULL; | |
7417 | req->flags &= ~REQ_F_INFLIGHT; | |
7418 | } | |
7419 | } | |
7420 | ||
5106dd6e | 7421 | static struct file *io_file_get_normal(struct io_kiocb *req, int fd) |
ac177053 | 7422 | { |
62906e89 | 7423 | struct file *file = fget(fd); |
ac177053 | 7424 | |
cef216fc | 7425 | trace_io_uring_file_get(req->ctx, req, req->cqe.user_data, fd); |
09bb8394 | 7426 | |
ac177053 | 7427 | /* we don't allow fixed io_uring files */ |
d5361233 JA |
7428 | if (file && file->f_op == &io_uring_fops) |
7429 | req->flags |= REQ_F_INFLIGHT; | |
8371adf5 | 7430 | return file; |
09bb8394 JA |
7431 | } |
7432 | ||
f237c30a | 7433 | static void io_req_task_link_timeout(struct io_kiocb *req, bool *locked) |
89b263f6 JA |
7434 | { |
7435 | struct io_kiocb *prev = req->timeout.prev; | |
617a8948 | 7436 | int ret = -ENOENT; |
89b263f6 JA |
7437 | |
7438 | if (prev) { | |
617a8948 | 7439 | if (!(req->task->flags & PF_EXITING)) |
cef216fc | 7440 | ret = io_try_cancel_userdata(req, prev->cqe.user_data); |
505657bc | 7441 | io_req_complete_post(req, ret ?: -ETIME, 0); |
89b263f6 | 7442 | io_put_req(prev); |
89b263f6 JA |
7443 | } else { |
7444 | io_req_complete_post(req, -ETIME, 0); | |
7445 | } | |
7446 | } | |
7447 | ||
2665abfd | 7448 | static enum hrtimer_restart io_link_timeout_fn(struct hrtimer *timer) |
2b188cc1 | 7449 | { |
ad8a48ac JA |
7450 | struct io_timeout_data *data = container_of(timer, |
7451 | struct io_timeout_data, timer); | |
90cd7e42 | 7452 | struct io_kiocb *prev, *req = data->req; |
2665abfd | 7453 | struct io_ring_ctx *ctx = req->ctx; |
2665abfd | 7454 | unsigned long flags; |
2665abfd | 7455 | |
89b263f6 | 7456 | spin_lock_irqsave(&ctx->timeout_lock, flags); |
90cd7e42 PB |
7457 | prev = req->timeout.head; |
7458 | req->timeout.head = NULL; | |
2665abfd JA |
7459 | |
7460 | /* | |
7461 | * We don't expect the list to be empty, that will only happen if we | |
7462 | * race with the completion of the linked work. | |
7463 | */ | |
447c19f3 | 7464 | if (prev) { |
f2f87370 | 7465 | io_remove_next_linked(prev); |
447c19f3 PB |
7466 | if (!req_ref_inc_not_zero(prev)) |
7467 | prev = NULL; | |
7468 | } | |
ef9dd637 | 7469 | list_del(&req->timeout.list); |
89b263f6 JA |
7470 | req->timeout.prev = prev; |
7471 | spin_unlock_irqrestore(&ctx->timeout_lock, flags); | |
2665abfd | 7472 | |
89b263f6 | 7473 | req->io_task_work.func = io_req_task_link_timeout; |
4813c377 | 7474 | io_req_task_work_add(req, false); |
2665abfd JA |
7475 | return HRTIMER_NORESTART; |
7476 | } | |
7477 | ||
de968c18 | 7478 | static void io_queue_linked_timeout(struct io_kiocb *req) |
2665abfd | 7479 | { |
de968c18 PB |
7480 | struct io_ring_ctx *ctx = req->ctx; |
7481 | ||
89b263f6 | 7482 | spin_lock_irq(&ctx->timeout_lock); |
76a46e06 | 7483 | /* |
f2f87370 PB |
7484 | * If the back reference is NULL, then our linked request finished |
7485 | * before we got a chance to setup the timer | |
76a46e06 | 7486 | */ |
90cd7e42 | 7487 | if (req->timeout.head) { |
e8c2bc1f | 7488 | struct io_timeout_data *data = req->async_data; |
94ae5e77 | 7489 | |
ad8a48ac JA |
7490 | data->timer.function = io_link_timeout_fn; |
7491 | hrtimer_start(&data->timer, timespec64_to_ktime(data->ts), | |
7492 | data->mode); | |
ef9dd637 | 7493 | list_add_tail(&req->timeout.list, &ctx->ltimeout_list); |
2665abfd | 7494 | } |
89b263f6 | 7495 | spin_unlock_irq(&ctx->timeout_lock); |
2665abfd | 7496 | /* drop submission reference */ |
76a46e06 JA |
7497 | io_put_req(req); |
7498 | } | |
2665abfd | 7499 | |
d475a9a6 PB |
7500 | static void io_queue_sqe_arm_apoll(struct io_kiocb *req) |
7501 | __must_hold(&req->ctx->uring_lock) | |
7502 | { | |
7503 | struct io_kiocb *linked_timeout = io_prep_linked_timeout(req); | |
7504 | ||
4d9237e3 | 7505 | switch (io_arm_poll_handler(req, 0)) { |
d475a9a6 | 7506 | case IO_APOLL_READY: |
d475a9a6 PB |
7507 | io_req_task_queue(req); |
7508 | break; | |
7509 | case IO_APOLL_ABORTED: | |
7510 | /* | |
7511 | * Queued up for async execution, worker will release | |
7512 | * submit reference when the iocb is actually submitted. | |
7513 | */ | |
7514 | io_queue_async_work(req, NULL); | |
7515 | break; | |
b1c62645 | 7516 | case IO_APOLL_OK: |
b1c62645 | 7517 | break; |
d475a9a6 PB |
7518 | } |
7519 | ||
7520 | if (linked_timeout) | |
7521 | io_queue_linked_timeout(linked_timeout); | |
7522 | } | |
7523 | ||
7524 | static inline void __io_queue_sqe(struct io_kiocb *req) | |
282cdc86 | 7525 | __must_hold(&req->ctx->uring_lock) |
2b188cc1 | 7526 | { |
906c6caa | 7527 | struct io_kiocb *linked_timeout; |
e0c5c576 | 7528 | int ret; |
2b188cc1 | 7529 | |
c5eef2b9 | 7530 | ret = io_issue_sqe(req, IO_URING_F_NONBLOCK|IO_URING_F_COMPLETE_DEFER); |
193155c8 | 7531 | |
fff4e40e PB |
7532 | if (req->flags & REQ_F_COMPLETE_INLINE) { |
7533 | io_req_add_compl_list(req); | |
d9f9d284 | 7534 | return; |
fff4e40e | 7535 | } |
491381ce JA |
7536 | /* |
7537 | * We async punt it if the file wasn't marked NOWAIT, or if the file | |
7538 | * doesn't support non-blocking read/write attempts | |
7539 | */ | |
1840038e | 7540 | if (likely(!ret)) { |
906c6caa PB |
7541 | linked_timeout = io_prep_linked_timeout(req); |
7542 | if (linked_timeout) | |
7543 | io_queue_linked_timeout(linked_timeout); | |
1840038e | 7544 | } else if (ret == -EAGAIN && !(req->flags & REQ_F_NOWAIT)) { |
d475a9a6 | 7545 | io_queue_sqe_arm_apoll(req); |
0d63c148 | 7546 | } else { |
f41db273 | 7547 | io_req_complete_failed(req, ret); |
9e645e11 | 7548 | } |
2b188cc1 JA |
7549 | } |
7550 | ||
4652fe3f | 7551 | static void io_queue_sqe_fallback(struct io_kiocb *req) |
282cdc86 | 7552 | __must_hold(&req->ctx->uring_lock) |
4fe2c963 | 7553 | { |
4652fe3f | 7554 | if (req->flags & REQ_F_FAIL) { |
c6d3d9cb | 7555 | io_req_complete_fail_submit(req); |
e0eb71dc PB |
7556 | } else if (unlikely(req->ctx->drain_active)) { |
7557 | io_drain_req(req); | |
76cc33d7 PB |
7558 | } else { |
7559 | int ret = io_req_prep_async(req); | |
7560 | ||
7561 | if (unlikely(ret)) | |
7562 | io_req_complete_failed(req, ret); | |
7563 | else | |
f237c30a | 7564 | io_queue_async_work(req, NULL); |
ce35a47a | 7565 | } |
4fe2c963 JL |
7566 | } |
7567 | ||
4652fe3f PB |
7568 | static inline void io_queue_sqe(struct io_kiocb *req) |
7569 | __must_hold(&req->ctx->uring_lock) | |
7570 | { | |
7571 | if (likely(!(req->flags & (REQ_F_FORCE_ASYNC | REQ_F_FAIL)))) | |
7572 | __io_queue_sqe(req); | |
7573 | else | |
7574 | io_queue_sqe_fallback(req); | |
7575 | } | |
7576 | ||
b16fed66 PB |
7577 | /* |
7578 | * Check SQE restrictions (opcode and flags). | |
7579 | * | |
7580 | * Returns 'true' if SQE is allowed, 'false' otherwise. | |
7581 | */ | |
7582 | static inline bool io_check_restriction(struct io_ring_ctx *ctx, | |
7583 | struct io_kiocb *req, | |
7584 | unsigned int sqe_flags) | |
4fe2c963 | 7585 | { |
b16fed66 PB |
7586 | if (!test_bit(req->opcode, ctx->restrictions.sqe_op)) |
7587 | return false; | |
7588 | ||
7589 | if ((sqe_flags & ctx->restrictions.sqe_flags_required) != | |
7590 | ctx->restrictions.sqe_flags_required) | |
7591 | return false; | |
7592 | ||
7593 | if (sqe_flags & ~(ctx->restrictions.sqe_flags_allowed | | |
7594 | ctx->restrictions.sqe_flags_required)) | |
7595 | return false; | |
7596 | ||
7597 | return true; | |
4fe2c963 JL |
7598 | } |
7599 | ||
22b2ca31 PB |
7600 | static void io_init_req_drain(struct io_kiocb *req) |
7601 | { | |
7602 | struct io_ring_ctx *ctx = req->ctx; | |
7603 | struct io_kiocb *head = ctx->submit_state.link.head; | |
7604 | ||
7605 | ctx->drain_active = true; | |
7606 | if (head) { | |
7607 | /* | |
7608 | * If we need to drain a request in the middle of a link, drain | |
7609 | * the head request and the next request/link after the current | |
7610 | * link. Considering sequential execution of links, | |
b6c7db32 | 7611 | * REQ_F_IO_DRAIN will be maintained for every request of our |
22b2ca31 PB |
7612 | * link. |
7613 | */ | |
b6c7db32 | 7614 | head->flags |= REQ_F_IO_DRAIN | REQ_F_FORCE_ASYNC; |
22b2ca31 PB |
7615 | ctx->drain_next = true; |
7616 | } | |
7617 | } | |
7618 | ||
b16fed66 PB |
7619 | static int io_init_req(struct io_ring_ctx *ctx, struct io_kiocb *req, |
7620 | const struct io_uring_sqe *sqe) | |
282cdc86 | 7621 | __must_hold(&ctx->uring_lock) |
b16fed66 | 7622 | { |
b16fed66 | 7623 | unsigned int sqe_flags; |
fc0ae024 | 7624 | int personality; |
4a04d1d1 | 7625 | u8 opcode; |
b16fed66 | 7626 | |
864ea921 | 7627 | /* req is partially pre-initialised, see io_preinit_req() */ |
4a04d1d1 | 7628 | req->opcode = opcode = READ_ONCE(sqe->opcode); |
b16fed66 PB |
7629 | /* same numerical values with corresponding REQ_F_*, safe to copy */ |
7630 | req->flags = sqe_flags = READ_ONCE(sqe->flags); | |
cef216fc | 7631 | req->cqe.user_data = READ_ONCE(sqe->user_data); |
b16fed66 | 7632 | req->file = NULL; |
b16fed66 | 7633 | req->fixed_rsrc_refs = NULL; |
b16fed66 | 7634 | req->task = current; |
b16fed66 | 7635 | |
4a04d1d1 PB |
7636 | if (unlikely(opcode >= IORING_OP_LAST)) { |
7637 | req->opcode = 0; | |
b16fed66 | 7638 | return -EINVAL; |
4a04d1d1 | 7639 | } |
68fe256a PB |
7640 | if (unlikely(sqe_flags & ~SQE_COMMON_FLAGS)) { |
7641 | /* enforce forwards compatibility on users */ | |
7642 | if (sqe_flags & ~SQE_VALID_FLAGS) | |
7643 | return -EINVAL; | |
7644 | if ((sqe_flags & IOSQE_BUFFER_SELECT) && | |
4a04d1d1 | 7645 | !io_op_defs[opcode].buffer_select) |
68fe256a | 7646 | return -EOPNOTSUPP; |
5562a8d7 PB |
7647 | if (sqe_flags & IOSQE_CQE_SKIP_SUCCESS) |
7648 | ctx->drain_disabled = true; | |
7649 | if (sqe_flags & IOSQE_IO_DRAIN) { | |
7650 | if (ctx->drain_disabled) | |
7651 | return -EOPNOTSUPP; | |
22b2ca31 | 7652 | io_init_req_drain(req); |
5562a8d7 | 7653 | } |
2a56a9bd PB |
7654 | } |
7655 | if (unlikely(ctx->restricted || ctx->drain_active || ctx->drain_next)) { | |
7656 | if (ctx->restricted && !io_check_restriction(ctx, req, sqe_flags)) | |
7657 | return -EACCES; | |
7658 | /* knock it to the slow queue path, will be drained there */ | |
7659 | if (ctx->drain_active) | |
7660 | req->flags |= REQ_F_FORCE_ASYNC; | |
7661 | /* if there is no link, we're at "next" request and need to drain */ | |
7662 | if (unlikely(ctx->drain_next) && !ctx->submit_state.link.head) { | |
7663 | ctx->drain_next = false; | |
7664 | ctx->drain_active = true; | |
b6c7db32 | 7665 | req->flags |= REQ_F_IO_DRAIN | REQ_F_FORCE_ASYNC; |
2a56a9bd | 7666 | } |
68fe256a | 7667 | } |
b16fed66 | 7668 | |
4a04d1d1 | 7669 | if (io_op_defs[opcode].needs_file) { |
6d63416d PB |
7670 | struct io_submit_state *state = &ctx->submit_state; |
7671 | ||
cef216fc | 7672 | req->cqe.fd = READ_ONCE(sqe->fd); |
6bf9c47a | 7673 | |
6d63416d PB |
7674 | /* |
7675 | * Plug now if we have more than 2 IO left after this, and the | |
7676 | * target is potentially a read/write to block based storage. | |
7677 | */ | |
4a04d1d1 | 7678 | if (state->need_plug && io_op_defs[opcode].plug) { |
6d63416d PB |
7679 | state->plug_started = true; |
7680 | state->need_plug = false; | |
5ca7a8b3 | 7681 | blk_start_plug_nr_ios(&state->plug, state->submit_nr); |
6d63416d | 7682 | } |
b16fed66 | 7683 | } |
863e0560 | 7684 | |
003e8dcc JA |
7685 | personality = READ_ONCE(sqe->personality); |
7686 | if (personality) { | |
cdab10bf LT |
7687 | int ret; |
7688 | ||
c10d1f98 PB |
7689 | req->creds = xa_load(&ctx->personalities, personality); |
7690 | if (!req->creds) | |
003e8dcc | 7691 | return -EINVAL; |
c10d1f98 | 7692 | get_cred(req->creds); |
cdc1404a PM |
7693 | ret = security_uring_override_creds(req->creds); |
7694 | if (ret) { | |
7695 | put_cred(req->creds); | |
7696 | return ret; | |
7697 | } | |
b8e64b53 | 7698 | req->flags |= REQ_F_CREDS; |
003e8dcc | 7699 | } |
b16fed66 | 7700 | |
fc0ae024 | 7701 | return io_req_prep(req, sqe); |
b16fed66 PB |
7702 | } |
7703 | ||
a6b8cadc | 7704 | static int io_submit_sqe(struct io_ring_ctx *ctx, struct io_kiocb *req, |
a1ab7b35 | 7705 | const struct io_uring_sqe *sqe) |
282cdc86 | 7706 | __must_hold(&ctx->uring_lock) |
9e645e11 | 7707 | { |
a1ab7b35 | 7708 | struct io_submit_link *link = &ctx->submit_state.link; |
ef4ff581 | 7709 | int ret; |
9e645e11 | 7710 | |
a6b8cadc PB |
7711 | ret = io_init_req(ctx, req, sqe); |
7712 | if (unlikely(ret)) { | |
502c87d6 | 7713 | trace_io_uring_req_failed(sqe, ctx, req, ret); |
a87acfde | 7714 | |
a8295b98 | 7715 | /* fail even hard links since we don't submit */ |
de59bc10 | 7716 | if (link->head) { |
a8295b98 HX |
7717 | /* |
7718 | * we can judge a link req is failed or cancelled by if | |
7719 | * REQ_F_FAIL is set, but the head is an exception since | |
7720 | * it may be set REQ_F_FAIL because of other req's failure | |
cef216fc | 7721 | * so let's leverage req->cqe.res to distinguish if a head |
a8295b98 HX |
7722 | * is set REQ_F_FAIL because of its failure or other req's |
7723 | * failure so that we can set the correct ret code for it. | |
7724 | * init result here to avoid affecting the normal path. | |
7725 | */ | |
7726 | if (!(link->head->flags & REQ_F_FAIL)) | |
7727 | req_fail_link_node(link->head, -ECANCELED); | |
7728 | } else if (!(req->flags & (REQ_F_LINK | REQ_F_HARDLINK))) { | |
7729 | /* | |
7730 | * the current req is a normal req, we should return | |
7731 | * error and thus break the submittion loop. | |
7732 | */ | |
7733 | io_req_complete_failed(req, ret); | |
7734 | return ret; | |
de59bc10 | 7735 | } |
a8295b98 | 7736 | req_fail_link_node(req, ret); |
a6b8cadc | 7737 | } |
441b8a78 | 7738 | |
be7053b7 | 7739 | /* don't need @sqe from now on */ |
cef216fc | 7740 | trace_io_uring_submit_sqe(ctx, req, req->cqe.user_data, req->opcode, |
236daeae OL |
7741 | req->flags, true, |
7742 | ctx->flags & IORING_SETUP_SQPOLL); | |
a6b8cadc | 7743 | |
9e645e11 JA |
7744 | /* |
7745 | * If we already have a head request, queue this one for async | |
7746 | * submittal once the head completes. If we don't have a head but | |
7747 | * IOSQE_IO_LINK is set in the sqe, start a new head. This one will be | |
7748 | * submitted sync once the chain is complete. If none of those | |
7749 | * conditions are true (normal request), then just queue it. | |
7750 | */ | |
863e0560 PB |
7751 | if (link->head) { |
7752 | struct io_kiocb *head = link->head; | |
4e88d6e7 | 7753 | |
a8295b98 HX |
7754 | if (!(req->flags & REQ_F_FAIL)) { |
7755 | ret = io_req_prep_async(req); | |
7756 | if (unlikely(ret)) { | |
7757 | req_fail_link_node(req, ret); | |
7758 | if (!(head->flags & REQ_F_FAIL)) | |
7759 | req_fail_link_node(head, -ECANCELED); | |
7760 | } | |
7761 | } | |
9d76377f | 7762 | trace_io_uring_link(ctx, req, head); |
f2f87370 | 7763 | link->last->link = req; |
863e0560 | 7764 | link->last = req; |
32fe525b | 7765 | |
f15a3431 PB |
7766 | if (req->flags & (REQ_F_LINK | REQ_F_HARDLINK)) |
7767 | return 0; | |
32fe525b | 7768 | /* last request of a link, enqueue the link */ |
f15a3431 PB |
7769 | link->head = NULL; |
7770 | req = head; | |
7771 | } else if (req->flags & (REQ_F_LINK | REQ_F_HARDLINK)) { | |
7772 | link->head = req; | |
7773 | link->last = req; | |
7774 | return 0; | |
9e645e11 | 7775 | } |
2e6e1fde | 7776 | |
f15a3431 | 7777 | io_queue_sqe(req); |
1d4240cc | 7778 | return 0; |
9e645e11 JA |
7779 | } |
7780 | ||
9a56a232 JA |
7781 | /* |
7782 | * Batched submission is done, ensure local IO is flushed out. | |
7783 | */ | |
553deffd | 7784 | static void io_submit_state_end(struct io_ring_ctx *ctx) |
9a56a232 | 7785 | { |
553deffd PB |
7786 | struct io_submit_state *state = &ctx->submit_state; |
7787 | ||
e126391c PB |
7788 | if (unlikely(state->link.head)) |
7789 | io_queue_sqe_fallback(state->link.head); | |
553deffd | 7790 | /* flush only after queuing links as they can generate completions */ |
c450178d | 7791 | io_submit_flush_completions(ctx); |
27926b68 JA |
7792 | if (state->plug_started) |
7793 | blk_finish_plug(&state->plug); | |
9a56a232 JA |
7794 | } |
7795 | ||
7796 | /* | |
7797 | * Start submission side cache. | |
7798 | */ | |
7799 | static void io_submit_state_start(struct io_submit_state *state, | |
ba88ff11 | 7800 | unsigned int max_ios) |
9a56a232 | 7801 | { |
27926b68 | 7802 | state->plug_started = false; |
4b628aeb | 7803 | state->need_plug = max_ios > 2; |
5ca7a8b3 | 7804 | state->submit_nr = max_ios; |
a1ab7b35 PB |
7805 | /* set only head, no need to init link_last in advance */ |
7806 | state->link.head = NULL; | |
9a56a232 JA |
7807 | } |
7808 | ||
2b188cc1 JA |
7809 | static void io_commit_sqring(struct io_ring_ctx *ctx) |
7810 | { | |
75b28aff | 7811 | struct io_rings *rings = ctx->rings; |
2b188cc1 | 7812 | |
caf582c6 PB |
7813 | /* |
7814 | * Ensure any loads from the SQEs are done at this point, | |
7815 | * since once we write the new head, the application could | |
7816 | * write new data to them. | |
7817 | */ | |
7818 | smp_store_release(&rings->sq.head, ctx->cached_sq_head); | |
2b188cc1 JA |
7819 | } |
7820 | ||
2b188cc1 | 7821 | /* |
dd9ae8a0 | 7822 | * Fetch an sqe, if one is available. Note this returns a pointer to memory |
2b188cc1 JA |
7823 | * that is mapped by userspace. This means that care needs to be taken to |
7824 | * ensure that reads are stable, as we cannot rely on userspace always | |
7825 | * being a good citizen. If members of the sqe are validated and then later | |
7826 | * used, it's important that those reads are done through READ_ONCE() to | |
7827 | * prevent a re-load down the line. | |
7828 | */ | |
709b302f | 7829 | static const struct io_uring_sqe *io_get_sqe(struct io_ring_ctx *ctx) |
2b188cc1 | 7830 | { |
ea5ab3b5 | 7831 | unsigned head, mask = ctx->sq_entries - 1; |
17d3aeb3 | 7832 | unsigned sq_idx = ctx->cached_sq_head++ & mask; |
2b188cc1 JA |
7833 | |
7834 | /* | |
7835 | * The cached sq head (or cq tail) serves two purposes: | |
7836 | * | |
7837 | * 1) allows us to batch the cost of updating the user visible | |
7838 | * head updates. | |
7839 | * 2) allows the kernel side to track the head on its own, even | |
7840 | * though the application is the one updating it. | |
7841 | */ | |
17d3aeb3 | 7842 | head = READ_ONCE(ctx->sq_array[sq_idx]); |
709b302f PB |
7843 | if (likely(head < ctx->sq_entries)) |
7844 | return &ctx->sq_sqes[head]; | |
2b188cc1 JA |
7845 | |
7846 | /* drop invalid entries */ | |
15641e42 PB |
7847 | ctx->cq_extra--; |
7848 | WRITE_ONCE(ctx->rings->sq_dropped, | |
7849 | READ_ONCE(ctx->rings->sq_dropped) + 1); | |
709b302f PB |
7850 | return NULL; |
7851 | } | |
7852 | ||
0f212204 | 7853 | static int io_submit_sqes(struct io_ring_ctx *ctx, unsigned int nr) |
282cdc86 | 7854 | __must_hold(&ctx->uring_lock) |
6c271ce2 | 7855 | { |
69629809 | 7856 | unsigned int entries = io_sqring_entries(ctx); |
46c4e16a | 7857 | int submitted = 0; |
6c271ce2 | 7858 | |
51d48dab | 7859 | if (unlikely(!entries)) |
69629809 | 7860 | return 0; |
ee7d46d9 | 7861 | /* make sure SQ entry isn't read before tail */ |
69629809 | 7862 | nr = min3(nr, ctx->sq_entries, entries); |
9a10867a | 7863 | io_get_task_refs(nr); |
6c271ce2 | 7864 | |
ba88ff11 | 7865 | io_submit_state_start(&ctx->submit_state, nr); |
69629809 | 7866 | do { |
3529d8c2 | 7867 | const struct io_uring_sqe *sqe; |
196be95c | 7868 | struct io_kiocb *req; |
fb5ccc98 | 7869 | |
a33ae9ce | 7870 | if (unlikely(!io_alloc_req_refill(ctx))) { |
196be95c PB |
7871 | if (!submitted) |
7872 | submitted = -EAGAIN; | |
fb5ccc98 | 7873 | break; |
196be95c | 7874 | } |
a33ae9ce | 7875 | req = io_alloc_req(ctx); |
4fccfcbb PB |
7876 | sqe = io_get_sqe(ctx); |
7877 | if (unlikely(!sqe)) { | |
c2b6c6bc | 7878 | wq_stack_add_head(&req->comp_list, &ctx->submit_state.free_list); |
4fccfcbb PB |
7879 | break; |
7880 | } | |
d3656344 JA |
7881 | /* will complete beyond this point, count as submitted */ |
7882 | submitted++; | |
bcbb7bf6 JA |
7883 | if (io_submit_sqe(ctx, req, sqe)) { |
7884 | /* | |
7885 | * Continue submitting even for sqe failure if the | |
7886 | * ring was setup with IORING_SETUP_SUBMIT_ALL | |
7887 | */ | |
7888 | if (!(ctx->flags & IORING_SETUP_SUBMIT_ALL)) | |
7889 | break; | |
7890 | } | |
69629809 | 7891 | } while (submitted < nr); |
6c271ce2 | 7892 | |
9466f437 PB |
7893 | if (unlikely(submitted != nr)) { |
7894 | int ref_used = (submitted == -EAGAIN) ? 0 : submitted; | |
d8a6df10 | 7895 | int unused = nr - ref_used; |
9466f437 | 7896 | |
09899b19 | 7897 | current->io_uring->cached_refs += unused; |
9466f437 | 7898 | } |
6c271ce2 | 7899 | |
553deffd | 7900 | io_submit_state_end(ctx); |
ae9428ca PB |
7901 | /* Commit SQ ring head once we've consumed and submitted all SQEs */ |
7902 | io_commit_sqring(ctx); | |
7903 | ||
6c271ce2 JA |
7904 | return submitted; |
7905 | } | |
7906 | ||
e4b6d902 PB |
7907 | static inline bool io_sqd_events_pending(struct io_sq_data *sqd) |
7908 | { | |
7909 | return READ_ONCE(sqd->state); | |
7910 | } | |
7911 | ||
23b3628e XW |
7912 | static inline void io_ring_set_wakeup_flag(struct io_ring_ctx *ctx) |
7913 | { | |
7914 | /* Tell userspace we may need a wakeup call */ | |
79ebeaee | 7915 | spin_lock(&ctx->completion_lock); |
20c0b380 NA |
7916 | WRITE_ONCE(ctx->rings->sq_flags, |
7917 | ctx->rings->sq_flags | IORING_SQ_NEED_WAKEUP); | |
79ebeaee | 7918 | spin_unlock(&ctx->completion_lock); |
23b3628e XW |
7919 | } |
7920 | ||
7921 | static inline void io_ring_clear_wakeup_flag(struct io_ring_ctx *ctx) | |
7922 | { | |
79ebeaee | 7923 | spin_lock(&ctx->completion_lock); |
20c0b380 NA |
7924 | WRITE_ONCE(ctx->rings->sq_flags, |
7925 | ctx->rings->sq_flags & ~IORING_SQ_NEED_WAKEUP); | |
79ebeaee | 7926 | spin_unlock(&ctx->completion_lock); |
23b3628e XW |
7927 | } |
7928 | ||
08369246 | 7929 | static int __io_sq_thread(struct io_ring_ctx *ctx, bool cap_entries) |
6c271ce2 | 7930 | { |
c8d1ba58 | 7931 | unsigned int to_submit; |
bdcd3eab | 7932 | int ret = 0; |
6c271ce2 | 7933 | |
c8d1ba58 | 7934 | to_submit = io_sqring_entries(ctx); |
e95eee2d | 7935 | /* if we're handling multiple rings, cap submit size for fairness */ |
4ce8ad95 OL |
7936 | if (cap_entries && to_submit > IORING_SQPOLL_CAP_ENTRIES_VALUE) |
7937 | to_submit = IORING_SQPOLL_CAP_ENTRIES_VALUE; | |
e95eee2d | 7938 | |
5eef4e87 | 7939 | if (!wq_list_empty(&ctx->iopoll_list) || to_submit) { |
948e1947 PB |
7940 | const struct cred *creds = NULL; |
7941 | ||
7942 | if (ctx->sq_creds != current_cred()) | |
7943 | creds = override_creds(ctx->sq_creds); | |
a4c0b3de | 7944 | |
c8d1ba58 | 7945 | mutex_lock(&ctx->uring_lock); |
5eef4e87 | 7946 | if (!wq_list_empty(&ctx->iopoll_list)) |
5ba3c874 | 7947 | io_do_iopoll(ctx, true); |
906a3c6f | 7948 | |
3b763ba1 PB |
7949 | /* |
7950 | * Don't submit if refs are dying, good for io_uring_register(), | |
7951 | * but also it is relied upon by io_ring_exit_work() | |
7952 | */ | |
0298ef96 PB |
7953 | if (to_submit && likely(!percpu_ref_is_dying(&ctx->refs)) && |
7954 | !(ctx->flags & IORING_SETUP_R_DISABLED)) | |
08369246 | 7955 | ret = io_submit_sqes(ctx, to_submit); |
c8d1ba58 | 7956 | mutex_unlock(&ctx->uring_lock); |
cb318216 | 7957 | |
acfb381d PB |
7958 | if (to_submit && wq_has_sleeper(&ctx->sqo_sq_wait)) |
7959 | wake_up(&ctx->sqo_sq_wait); | |
948e1947 PB |
7960 | if (creds) |
7961 | revert_creds(creds); | |
acfb381d | 7962 | } |
6c271ce2 | 7963 | |
08369246 XW |
7964 | return ret; |
7965 | } | |
6c271ce2 | 7966 | |
c072481d | 7967 | static __cold void io_sqd_update_thread_idle(struct io_sq_data *sqd) |
08369246 XW |
7968 | { |
7969 | struct io_ring_ctx *ctx; | |
7970 | unsigned sq_thread_idle = 0; | |
6c271ce2 | 7971 | |
c9dca27d PB |
7972 | list_for_each_entry(ctx, &sqd->ctx_list, sqd_list) |
7973 | sq_thread_idle = max(sq_thread_idle, ctx->sq_thread_idle); | |
08369246 | 7974 | sqd->sq_thread_idle = sq_thread_idle; |
c8d1ba58 | 7975 | } |
6c271ce2 | 7976 | |
e4b6d902 PB |
7977 | static bool io_sqd_handle_event(struct io_sq_data *sqd) |
7978 | { | |
7979 | bool did_sig = false; | |
7980 | struct ksignal ksig; | |
7981 | ||
7982 | if (test_bit(IO_SQ_THREAD_SHOULD_PARK, &sqd->state) || | |
7983 | signal_pending(current)) { | |
7984 | mutex_unlock(&sqd->lock); | |
7985 | if (signal_pending(current)) | |
7986 | did_sig = get_signal(&ksig); | |
7987 | cond_resched(); | |
7988 | mutex_lock(&sqd->lock); | |
7989 | } | |
e4b6d902 PB |
7990 | return did_sig || test_bit(IO_SQ_THREAD_SHOULD_STOP, &sqd->state); |
7991 | } | |
7992 | ||
c8d1ba58 JA |
7993 | static int io_sq_thread(void *data) |
7994 | { | |
69fb2131 JA |
7995 | struct io_sq_data *sqd = data; |
7996 | struct io_ring_ctx *ctx; | |
a0d9205f | 7997 | unsigned long timeout = 0; |
37d1e2e3 | 7998 | char buf[TASK_COMM_LEN]; |
08369246 | 7999 | DEFINE_WAIT(wait); |
6c271ce2 | 8000 | |
696ee88a | 8001 | snprintf(buf, sizeof(buf), "iou-sqp-%d", sqd->task_pid); |
37d1e2e3 | 8002 | set_task_comm(current, buf); |
37d1e2e3 JA |
8003 | |
8004 | if (sqd->sq_cpu != -1) | |
8005 | set_cpus_allowed_ptr(current, cpumask_of(sqd->sq_cpu)); | |
8006 | else | |
8007 | set_cpus_allowed_ptr(current, cpu_online_mask); | |
8008 | current->flags |= PF_NO_SETAFFINITY; | |
8009 | ||
5bd2182d PM |
8010 | audit_alloc_kernel(current); |
8011 | ||
09a6f4ef | 8012 | mutex_lock(&sqd->lock); |
e4b6d902 | 8013 | while (1) { |
1a924a80 | 8014 | bool cap_entries, sqt_spin = false; |
c1edbf5f | 8015 | |
e4b6d902 PB |
8016 | if (io_sqd_events_pending(sqd) || signal_pending(current)) { |
8017 | if (io_sqd_handle_event(sqd)) | |
c7d95613 | 8018 | break; |
08369246 XW |
8019 | timeout = jiffies + sqd->sq_thread_idle; |
8020 | } | |
e4b6d902 | 8021 | |
e95eee2d | 8022 | cap_entries = !list_is_singular(&sqd->ctx_list); |
69fb2131 | 8023 | list_for_each_entry(ctx, &sqd->ctx_list, sqd_list) { |
948e1947 | 8024 | int ret = __io_sq_thread(ctx, cap_entries); |
7c30f36a | 8025 | |
5eef4e87 | 8026 | if (!sqt_spin && (ret > 0 || !wq_list_empty(&ctx->iopoll_list))) |
08369246 | 8027 | sqt_spin = true; |
69fb2131 | 8028 | } |
dd432ea5 PB |
8029 | if (io_run_task_work()) |
8030 | sqt_spin = true; | |
6c271ce2 | 8031 | |
08369246 | 8032 | if (sqt_spin || !time_after(jiffies, timeout)) { |
c8d1ba58 | 8033 | cond_resched(); |
08369246 XW |
8034 | if (sqt_spin) |
8035 | timeout = jiffies + sqd->sq_thread_idle; | |
8036 | continue; | |
8037 | } | |
8038 | ||
08369246 | 8039 | prepare_to_wait(&sqd->wait, &wait, TASK_INTERRUPTIBLE); |
7f62d40d | 8040 | if (!io_sqd_events_pending(sqd) && !task_work_pending(current)) { |
1a924a80 PB |
8041 | bool needs_sched = true; |
8042 | ||
724cb4f9 | 8043 | list_for_each_entry(ctx, &sqd->ctx_list, sqd_list) { |
aaa9f0f4 PB |
8044 | io_ring_set_wakeup_flag(ctx); |
8045 | ||
724cb4f9 | 8046 | if ((ctx->flags & IORING_SETUP_IOPOLL) && |
5eef4e87 | 8047 | !wq_list_empty(&ctx->iopoll_list)) { |
724cb4f9 HX |
8048 | needs_sched = false; |
8049 | break; | |
8050 | } | |
649bb75d AK |
8051 | |
8052 | /* | |
8053 | * Ensure the store of the wakeup flag is not | |
8054 | * reordered with the load of the SQ tail | |
8055 | */ | |
8056 | smp_mb(); | |
8057 | ||
724cb4f9 HX |
8058 | if (io_sqring_entries(ctx)) { |
8059 | needs_sched = false; | |
8060 | break; | |
8061 | } | |
8062 | } | |
8063 | ||
8064 | if (needs_sched) { | |
8065 | mutex_unlock(&sqd->lock); | |
8066 | schedule(); | |
8067 | mutex_lock(&sqd->lock); | |
8068 | } | |
69fb2131 JA |
8069 | list_for_each_entry(ctx, &sqd->ctx_list, sqd_list) |
8070 | io_ring_clear_wakeup_flag(ctx); | |
6c271ce2 | 8071 | } |
08369246 XW |
8072 | |
8073 | finish_wait(&sqd->wait, &wait); | |
8074 | timeout = jiffies + sqd->sq_thread_idle; | |
6c271ce2 | 8075 | } |
28cea78a | 8076 | |
78cc687b | 8077 | io_uring_cancel_generic(true, sqd); |
37d1e2e3 | 8078 | sqd->thread = NULL; |
05962f95 | 8079 | list_for_each_entry(ctx, &sqd->ctx_list, sqd_list) |
5f3f26f9 | 8080 | io_ring_set_wakeup_flag(ctx); |
521d6a73 | 8081 | io_run_task_work(); |
734551df PB |
8082 | mutex_unlock(&sqd->lock); |
8083 | ||
5bd2182d PM |
8084 | audit_free(current); |
8085 | ||
37d1e2e3 JA |
8086 | complete(&sqd->exited); |
8087 | do_exit(0); | |
6c271ce2 JA |
8088 | } |
8089 | ||
bda52162 JA |
8090 | struct io_wait_queue { |
8091 | struct wait_queue_entry wq; | |
8092 | struct io_ring_ctx *ctx; | |
5fd46178 | 8093 | unsigned cq_tail; |
bda52162 JA |
8094 | unsigned nr_timeouts; |
8095 | }; | |
8096 | ||
6c503150 | 8097 | static inline bool io_should_wake(struct io_wait_queue *iowq) |
bda52162 JA |
8098 | { |
8099 | struct io_ring_ctx *ctx = iowq->ctx; | |
5fd46178 | 8100 | int dist = ctx->cached_cq_tail - (int) iowq->cq_tail; |
bda52162 JA |
8101 | |
8102 | /* | |
d195a66e | 8103 | * Wake up if we have enough events, or if a timeout occurred since we |
bda52162 JA |
8104 | * started waiting. For timeouts, we always want to return to userspace, |
8105 | * regardless of event count. | |
8106 | */ | |
5fd46178 | 8107 | return dist >= 0 || atomic_read(&ctx->cq_timeouts) != iowq->nr_timeouts; |
bda52162 JA |
8108 | } |
8109 | ||
8110 | static int io_wake_function(struct wait_queue_entry *curr, unsigned int mode, | |
8111 | int wake_flags, void *key) | |
8112 | { | |
8113 | struct io_wait_queue *iowq = container_of(curr, struct io_wait_queue, | |
8114 | wq); | |
8115 | ||
6c503150 PB |
8116 | /* |
8117 | * Cannot safely flush overflowed CQEs from here, ensure we wake up | |
8118 | * the task, and the next invocation will do it. | |
8119 | */ | |
5ed7a37d | 8120 | if (io_should_wake(iowq) || test_bit(0, &iowq->ctx->check_cq_overflow)) |
6c503150 PB |
8121 | return autoremove_wake_function(curr, mode, wake_flags, key); |
8122 | return -1; | |
bda52162 JA |
8123 | } |
8124 | ||
af9c1a44 JA |
8125 | static int io_run_task_work_sig(void) |
8126 | { | |
8127 | if (io_run_task_work()) | |
8128 | return 1; | |
0b8cfa97 | 8129 | if (test_thread_flag(TIF_NOTIFY_SIGNAL)) |
792ee0f6 | 8130 | return -ERESTARTSYS; |
c5020bc8 OL |
8131 | if (task_sigpending(current)) |
8132 | return -EINTR; | |
8133 | return 0; | |
af9c1a44 JA |
8134 | } |
8135 | ||
eeb60b9a PB |
8136 | /* when returns >0, the caller should retry */ |
8137 | static inline int io_cqring_wait_schedule(struct io_ring_ctx *ctx, | |
8138 | struct io_wait_queue *iowq, | |
22833966 | 8139 | ktime_t timeout) |
eeb60b9a PB |
8140 | { |
8141 | int ret; | |
8142 | ||
8143 | /* make sure we run task_work before checking for signals */ | |
8144 | ret = io_run_task_work_sig(); | |
8145 | if (ret || io_should_wake(iowq)) | |
8146 | return ret; | |
8147 | /* let the caller flush overflows, retry */ | |
5ed7a37d | 8148 | if (test_bit(0, &ctx->check_cq_overflow)) |
eeb60b9a PB |
8149 | return 1; |
8150 | ||
22833966 JA |
8151 | if (!schedule_hrtimeout(&timeout, HRTIMER_MODE_ABS)) |
8152 | return -ETIME; | |
8153 | return 1; | |
eeb60b9a PB |
8154 | } |
8155 | ||
2b188cc1 JA |
8156 | /* |
8157 | * Wait until events become available, if we don't already have some. The | |
8158 | * application must reap them itself, as they reside on the shared cq ring. | |
8159 | */ | |
8160 | static int io_cqring_wait(struct io_ring_ctx *ctx, int min_events, | |
c73ebb68 HX |
8161 | const sigset_t __user *sig, size_t sigsz, |
8162 | struct __kernel_timespec __user *uts) | |
2b188cc1 | 8163 | { |
90291099 | 8164 | struct io_wait_queue iowq; |
75b28aff | 8165 | struct io_rings *rings = ctx->rings; |
22833966 | 8166 | ktime_t timeout = KTIME_MAX; |
c1d5a224 | 8167 | int ret; |
2b188cc1 | 8168 | |
b41e9852 | 8169 | do { |
90f67366 | 8170 | io_cqring_overflow_flush(ctx); |
6c503150 | 8171 | if (io_cqring_events(ctx) >= min_events) |
b41e9852 | 8172 | return 0; |
4c6e277c | 8173 | if (!io_run_task_work()) |
b41e9852 | 8174 | break; |
b41e9852 | 8175 | } while (1); |
2b188cc1 JA |
8176 | |
8177 | if (sig) { | |
9e75ad5d AB |
8178 | #ifdef CONFIG_COMPAT |
8179 | if (in_compat_syscall()) | |
8180 | ret = set_compat_user_sigmask((const compat_sigset_t __user *)sig, | |
b772434b | 8181 | sigsz); |
9e75ad5d AB |
8182 | else |
8183 | #endif | |
b772434b | 8184 | ret = set_user_sigmask(sig, sigsz); |
9e75ad5d | 8185 | |
2b188cc1 JA |
8186 | if (ret) |
8187 | return ret; | |
8188 | } | |
8189 | ||
950e79dd OL |
8190 | if (uts) { |
8191 | struct timespec64 ts; | |
8192 | ||
8193 | if (get_timespec64(&ts, uts)) | |
8194 | return -EFAULT; | |
8195 | timeout = ktime_add_ns(timespec64_to_ktime(ts), ktime_get_ns()); | |
8196 | } | |
8197 | ||
90291099 PB |
8198 | init_waitqueue_func_entry(&iowq.wq, io_wake_function); |
8199 | iowq.wq.private = current; | |
8200 | INIT_LIST_HEAD(&iowq.wq.entry); | |
8201 | iowq.ctx = ctx; | |
bda52162 | 8202 | iowq.nr_timeouts = atomic_read(&ctx->cq_timeouts); |
5fd46178 | 8203 | iowq.cq_tail = READ_ONCE(ctx->rings->cq.head) + min_events; |
90291099 | 8204 | |
c826bd7a | 8205 | trace_io_uring_cqring_wait(ctx, min_events); |
bda52162 | 8206 | do { |
ca0a2651 | 8207 | /* if we can't even flush overflow, don't wait for more */ |
90f67366 | 8208 | if (!io_cqring_overflow_flush(ctx)) { |
ca0a2651 JA |
8209 | ret = -EBUSY; |
8210 | break; | |
8211 | } | |
311997b3 | 8212 | prepare_to_wait_exclusive(&ctx->cq_wait, &iowq.wq, |
bda52162 | 8213 | TASK_INTERRUPTIBLE); |
22833966 | 8214 | ret = io_cqring_wait_schedule(ctx, &iowq, timeout); |
ca0a2651 | 8215 | cond_resched(); |
eeb60b9a | 8216 | } while (ret > 0); |
bda52162 | 8217 | |
b4f20bb4 | 8218 | finish_wait(&ctx->cq_wait, &iowq.wq); |
b7db41c9 | 8219 | restore_saved_sigmask_unless(ret == -EINTR); |
2b188cc1 | 8220 | |
75b28aff | 8221 | return READ_ONCE(rings->cq.head) == READ_ONCE(rings->cq.tail) ? ret : 0; |
2b188cc1 JA |
8222 | } |
8223 | ||
9123c8ff | 8224 | static void io_free_page_table(void **table, size_t size) |
05f3fb3c | 8225 | { |
9123c8ff | 8226 | unsigned i, nr_tables = DIV_ROUND_UP(size, PAGE_SIZE); |
05f3fb3c | 8227 | |
846a4ef2 | 8228 | for (i = 0; i < nr_tables; i++) |
9123c8ff PB |
8229 | kfree(table[i]); |
8230 | kfree(table); | |
8231 | } | |
8232 | ||
c072481d | 8233 | static __cold void **io_alloc_page_table(size_t size) |
9123c8ff PB |
8234 | { |
8235 | unsigned i, nr_tables = DIV_ROUND_UP(size, PAGE_SIZE); | |
8236 | size_t init_size = size; | |
8237 | void **table; | |
8238 | ||
0bea96f5 | 8239 | table = kcalloc(nr_tables, sizeof(*table), GFP_KERNEL_ACCOUNT); |
9123c8ff PB |
8240 | if (!table) |
8241 | return NULL; | |
8242 | ||
8243 | for (i = 0; i < nr_tables; i++) { | |
27f6b318 | 8244 | unsigned int this_size = min_t(size_t, size, PAGE_SIZE); |
9123c8ff | 8245 | |
0bea96f5 | 8246 | table[i] = kzalloc(this_size, GFP_KERNEL_ACCOUNT); |
9123c8ff PB |
8247 | if (!table[i]) { |
8248 | io_free_page_table(table, init_size); | |
8249 | return NULL; | |
8250 | } | |
8251 | size -= this_size; | |
8252 | } | |
8253 | return table; | |
05f3fb3c JA |
8254 | } |
8255 | ||
28a9fe25 | 8256 | static void io_rsrc_node_destroy(struct io_rsrc_node *ref_node) |
1642b445 | 8257 | { |
28a9fe25 PB |
8258 | percpu_ref_exit(&ref_node->refs); |
8259 | kfree(ref_node); | |
1642b445 PB |
8260 | } |
8261 | ||
c072481d | 8262 | static __cold void io_rsrc_node_ref_zero(struct percpu_ref *ref) |
b9bd2bea PB |
8263 | { |
8264 | struct io_rsrc_node *node = container_of(ref, struct io_rsrc_node, refs); | |
8265 | struct io_ring_ctx *ctx = node->rsrc_data->ctx; | |
8266 | unsigned long flags; | |
8267 | bool first_add = false; | |
b36a2050 | 8268 | unsigned long delay = HZ; |
b9bd2bea PB |
8269 | |
8270 | spin_lock_irqsave(&ctx->rsrc_ref_lock, flags); | |
8271 | node->done = true; | |
8272 | ||
b36a2050 DY |
8273 | /* if we are mid-quiesce then do not delay */ |
8274 | if (node->rsrc_data->quiesce) | |
8275 | delay = 0; | |
8276 | ||
b9bd2bea PB |
8277 | while (!list_empty(&ctx->rsrc_ref_list)) { |
8278 | node = list_first_entry(&ctx->rsrc_ref_list, | |
8279 | struct io_rsrc_node, node); | |
8280 | /* recycle ref nodes in order */ | |
8281 | if (!node->done) | |
8282 | break; | |
8283 | list_del(&node->node); | |
8284 | first_add |= llist_add(&node->llist, &ctx->rsrc_put_llist); | |
8285 | } | |
8286 | spin_unlock_irqrestore(&ctx->rsrc_ref_lock, flags); | |
8287 | ||
8288 | if (first_add) | |
b36a2050 | 8289 | mod_delayed_work(system_wq, &ctx->rsrc_put_work, delay); |
b9bd2bea PB |
8290 | } |
8291 | ||
f6133fbd | 8292 | static struct io_rsrc_node *io_rsrc_node_alloc(void) |
b9bd2bea PB |
8293 | { |
8294 | struct io_rsrc_node *ref_node; | |
8295 | ||
8296 | ref_node = kzalloc(sizeof(*ref_node), GFP_KERNEL); | |
8297 | if (!ref_node) | |
8298 | return NULL; | |
8299 | ||
8300 | if (percpu_ref_init(&ref_node->refs, io_rsrc_node_ref_zero, | |
8301 | 0, GFP_KERNEL)) { | |
8302 | kfree(ref_node); | |
8303 | return NULL; | |
8304 | } | |
8305 | INIT_LIST_HEAD(&ref_node->node); | |
8306 | INIT_LIST_HEAD(&ref_node->rsrc_list); | |
8307 | ref_node->done = false; | |
8308 | return ref_node; | |
8309 | } | |
8310 | ||
a7f0ed5a PB |
8311 | static void io_rsrc_node_switch(struct io_ring_ctx *ctx, |
8312 | struct io_rsrc_data *data_to_kill) | |
ab409402 | 8313 | __must_hold(&ctx->uring_lock) |
6b06314c | 8314 | { |
a7f0ed5a PB |
8315 | WARN_ON_ONCE(!ctx->rsrc_backup_node); |
8316 | WARN_ON_ONCE(data_to_kill && !ctx->rsrc_node); | |
6b06314c | 8317 | |
ab409402 PB |
8318 | io_rsrc_refs_drop(ctx); |
8319 | ||
a7f0ed5a PB |
8320 | if (data_to_kill) { |
8321 | struct io_rsrc_node *rsrc_node = ctx->rsrc_node; | |
82fbcfa9 | 8322 | |
a7f0ed5a | 8323 | rsrc_node->rsrc_data = data_to_kill; |
4956b9ea | 8324 | spin_lock_irq(&ctx->rsrc_ref_lock); |
a7f0ed5a | 8325 | list_add_tail(&rsrc_node->node, &ctx->rsrc_ref_list); |
4956b9ea | 8326 | spin_unlock_irq(&ctx->rsrc_ref_lock); |
82fbcfa9 | 8327 | |
3e942498 | 8328 | atomic_inc(&data_to_kill->refs); |
a7f0ed5a PB |
8329 | percpu_ref_kill(&rsrc_node->refs); |
8330 | ctx->rsrc_node = NULL; | |
8331 | } | |
6b06314c | 8332 | |
a7f0ed5a PB |
8333 | if (!ctx->rsrc_node) { |
8334 | ctx->rsrc_node = ctx->rsrc_backup_node; | |
8335 | ctx->rsrc_backup_node = NULL; | |
8336 | } | |
8bad28d8 HX |
8337 | } |
8338 | ||
a7f0ed5a | 8339 | static int io_rsrc_node_switch_start(struct io_ring_ctx *ctx) |
8dd03afe PB |
8340 | { |
8341 | if (ctx->rsrc_backup_node) | |
8342 | return 0; | |
f6133fbd | 8343 | ctx->rsrc_backup_node = io_rsrc_node_alloc(); |
8dd03afe | 8344 | return ctx->rsrc_backup_node ? 0 : -ENOMEM; |
8bad28d8 HX |
8345 | } |
8346 | ||
c072481d PB |
8347 | static __cold int io_rsrc_ref_quiesce(struct io_rsrc_data *data, |
8348 | struct io_ring_ctx *ctx) | |
8bad28d8 HX |
8349 | { |
8350 | int ret; | |
05589553 | 8351 | |
215c3902 | 8352 | /* As we may drop ->uring_lock, other task may have started quiesce */ |
8bad28d8 HX |
8353 | if (data->quiesce) |
8354 | return -ENXIO; | |
05589553 | 8355 | |
8bad28d8 | 8356 | data->quiesce = true; |
1ffc5422 | 8357 | do { |
a7f0ed5a | 8358 | ret = io_rsrc_node_switch_start(ctx); |
8dd03afe | 8359 | if (ret) |
f2303b1f | 8360 | break; |
a7f0ed5a | 8361 | io_rsrc_node_switch(ctx, data); |
f2303b1f | 8362 | |
3e942498 PB |
8363 | /* kill initial ref, already quiesced if zero */ |
8364 | if (atomic_dec_and_test(&data->refs)) | |
8365 | break; | |
c018db4a | 8366 | mutex_unlock(&ctx->uring_lock); |
8bad28d8 | 8367 | flush_delayed_work(&ctx->rsrc_put_work); |
1ffc5422 | 8368 | ret = wait_for_completion_interruptible(&data->done); |
c018db4a JA |
8369 | if (!ret) { |
8370 | mutex_lock(&ctx->uring_lock); | |
80912cef DY |
8371 | if (atomic_read(&data->refs) > 0) { |
8372 | /* | |
8373 | * it has been revived by another thread while | |
8374 | * we were unlocked | |
8375 | */ | |
8376 | mutex_unlock(&ctx->uring_lock); | |
8377 | } else { | |
8378 | break; | |
8379 | } | |
c018db4a | 8380 | } |
8bad28d8 | 8381 | |
3e942498 PB |
8382 | atomic_inc(&data->refs); |
8383 | /* wait for all works potentially completing data->done */ | |
8384 | flush_delayed_work(&ctx->rsrc_put_work); | |
cb5e1b81 | 8385 | reinit_completion(&data->done); |
8dd03afe | 8386 | |
1ffc5422 | 8387 | ret = io_run_task_work_sig(); |
8bad28d8 | 8388 | mutex_lock(&ctx->uring_lock); |
f2303b1f | 8389 | } while (ret >= 0); |
8bad28d8 | 8390 | data->quiesce = false; |
05f3fb3c | 8391 | |
8bad28d8 | 8392 | return ret; |
d7954b2b BM |
8393 | } |
8394 | ||
2d091d62 PB |
8395 | static u64 *io_get_tag_slot(struct io_rsrc_data *data, unsigned int idx) |
8396 | { | |
8397 | unsigned int off = idx & IO_RSRC_TAG_TABLE_MASK; | |
8398 | unsigned int table_idx = idx >> IO_RSRC_TAG_TABLE_SHIFT; | |
8399 | ||
8400 | return &data->tags[table_idx][off]; | |
8401 | } | |
8402 | ||
44b31f2f | 8403 | static void io_rsrc_data_free(struct io_rsrc_data *data) |
1ad555c6 | 8404 | { |
2d091d62 PB |
8405 | size_t size = data->nr * sizeof(data->tags[0][0]); |
8406 | ||
8407 | if (data->tags) | |
8408 | io_free_page_table((void **)data->tags, size); | |
44b31f2f PB |
8409 | kfree(data); |
8410 | } | |
8411 | ||
c072481d PB |
8412 | static __cold int io_rsrc_data_alloc(struct io_ring_ctx *ctx, rsrc_put_fn *do_put, |
8413 | u64 __user *utags, unsigned nr, | |
8414 | struct io_rsrc_data **pdata) | |
1ad555c6 | 8415 | { |
b895c9a6 | 8416 | struct io_rsrc_data *data; |
2d091d62 | 8417 | int ret = -ENOMEM; |
d878c816 | 8418 | unsigned i; |
1ad555c6 BM |
8419 | |
8420 | data = kzalloc(sizeof(*data), GFP_KERNEL); | |
8421 | if (!data) | |
d878c816 | 8422 | return -ENOMEM; |
2d091d62 | 8423 | data->tags = (u64 **)io_alloc_page_table(nr * sizeof(data->tags[0][0])); |
b60c8dce | 8424 | if (!data->tags) { |
1ad555c6 | 8425 | kfree(data); |
d878c816 PB |
8426 | return -ENOMEM; |
8427 | } | |
2d091d62 PB |
8428 | |
8429 | data->nr = nr; | |
8430 | data->ctx = ctx; | |
8431 | data->do_put = do_put; | |
d878c816 | 8432 | if (utags) { |
2d091d62 | 8433 | ret = -EFAULT; |
d878c816 | 8434 | for (i = 0; i < nr; i++) { |
fdd1dc31 CIK |
8435 | u64 *tag_slot = io_get_tag_slot(data, i); |
8436 | ||
8437 | if (copy_from_user(tag_slot, &utags[i], | |
8438 | sizeof(*tag_slot))) | |
2d091d62 | 8439 | goto fail; |
d878c816 | 8440 | } |
1ad555c6 | 8441 | } |
b60c8dce | 8442 | |
3e942498 | 8443 | atomic_set(&data->refs, 1); |
1ad555c6 | 8444 | init_completion(&data->done); |
d878c816 PB |
8445 | *pdata = data; |
8446 | return 0; | |
2d091d62 PB |
8447 | fail: |
8448 | io_rsrc_data_free(data); | |
8449 | return ret; | |
1ad555c6 BM |
8450 | } |
8451 | ||
9123c8ff PB |
8452 | static bool io_alloc_file_tables(struct io_file_table *table, unsigned nr_files) |
8453 | { | |
0bea96f5 PB |
8454 | table->files = kvcalloc(nr_files, sizeof(table->files[0]), |
8455 | GFP_KERNEL_ACCOUNT); | |
9123c8ff PB |
8456 | return !!table->files; |
8457 | } | |
8458 | ||
042b0d85 | 8459 | static void io_free_file_tables(struct io_file_table *table) |
9123c8ff | 8460 | { |
042b0d85 | 8461 | kvfree(table->files); |
9123c8ff PB |
8462 | table->files = NULL; |
8463 | } | |
8464 | ||
fff4db76 | 8465 | static void __io_sqe_files_unregister(struct io_ring_ctx *ctx) |
1ad555c6 | 8466 | { |
1f59bc0f PB |
8467 | int i; |
8468 | ||
8469 | for (i = 0; i < ctx->nr_user_files; i++) { | |
8470 | struct file *file = io_file_from_index(ctx, i); | |
8471 | ||
8472 | if (!file || io_file_need_scm(file)) | |
8473 | continue; | |
8474 | io_fixed_file_slot(&ctx->file_table, i)->file_ptr = 0; | |
8475 | fput(file); | |
8476 | } | |
8477 | ||
fff4db76 PB |
8478 | #if defined(CONFIG_UNIX) |
8479 | if (ctx->ring_sock) { | |
8480 | struct sock *sock = ctx->ring_sock->sk; | |
8481 | struct sk_buff *skb; | |
8482 | ||
8483 | while ((skb = skb_dequeue(&sock->sk_receive_queue)) != NULL) | |
8484 | kfree_skb(skb); | |
8485 | } | |
fff4db76 | 8486 | #endif |
042b0d85 | 8487 | io_free_file_tables(&ctx->file_table); |
44b31f2f | 8488 | io_rsrc_data_free(ctx->file_data); |
fff4db76 PB |
8489 | ctx->file_data = NULL; |
8490 | ctx->nr_user_files = 0; | |
1ad555c6 BM |
8491 | } |
8492 | ||
d7954b2b BM |
8493 | static int io_sqe_files_unregister(struct io_ring_ctx *ctx) |
8494 | { | |
d7954b2b BM |
8495 | int ret; |
8496 | ||
08480400 | 8497 | if (!ctx->file_data) |
d7954b2b | 8498 | return -ENXIO; |
08480400 PB |
8499 | ret = io_rsrc_ref_quiesce(ctx->file_data, ctx); |
8500 | if (!ret) | |
8501 | __io_sqe_files_unregister(ctx); | |
8502 | return ret; | |
6b06314c JA |
8503 | } |
8504 | ||
37d1e2e3 | 8505 | static void io_sq_thread_unpark(struct io_sq_data *sqd) |
09a6f4ef | 8506 | __releases(&sqd->lock) |
37d1e2e3 | 8507 | { |
521d6a73 PB |
8508 | WARN_ON_ONCE(sqd->thread == current); |
8509 | ||
9e138a48 PB |
8510 | /* |
8511 | * Do the dance but not conditional clear_bit() because it'd race with | |
8512 | * other threads incrementing park_pending and setting the bit. | |
8513 | */ | |
37d1e2e3 | 8514 | clear_bit(IO_SQ_THREAD_SHOULD_PARK, &sqd->state); |
9e138a48 PB |
8515 | if (atomic_dec_return(&sqd->park_pending)) |
8516 | set_bit(IO_SQ_THREAD_SHOULD_PARK, &sqd->state); | |
09a6f4ef | 8517 | mutex_unlock(&sqd->lock); |
37d1e2e3 JA |
8518 | } |
8519 | ||
86e0d676 | 8520 | static void io_sq_thread_park(struct io_sq_data *sqd) |
09a6f4ef | 8521 | __acquires(&sqd->lock) |
37d1e2e3 | 8522 | { |
521d6a73 PB |
8523 | WARN_ON_ONCE(sqd->thread == current); |
8524 | ||
9e138a48 | 8525 | atomic_inc(&sqd->park_pending); |
86e0d676 | 8526 | set_bit(IO_SQ_THREAD_SHOULD_PARK, &sqd->state); |
09a6f4ef | 8527 | mutex_lock(&sqd->lock); |
05962f95 | 8528 | if (sqd->thread) |
86e0d676 | 8529 | wake_up_process(sqd->thread); |
37d1e2e3 JA |
8530 | } |
8531 | ||
8532 | static void io_sq_thread_stop(struct io_sq_data *sqd) | |
8533 | { | |
521d6a73 | 8534 | WARN_ON_ONCE(sqd->thread == current); |
88885f66 | 8535 | WARN_ON_ONCE(test_bit(IO_SQ_THREAD_SHOULD_STOP, &sqd->state)); |
521d6a73 | 8536 | |
05962f95 | 8537 | set_bit(IO_SQ_THREAD_SHOULD_STOP, &sqd->state); |
88885f66 | 8538 | mutex_lock(&sqd->lock); |
e8f98f24 JA |
8539 | if (sqd->thread) |
8540 | wake_up_process(sqd->thread); | |
09a6f4ef | 8541 | mutex_unlock(&sqd->lock); |
05962f95 | 8542 | wait_for_completion(&sqd->exited); |
37d1e2e3 JA |
8543 | } |
8544 | ||
534ca6d6 | 8545 | static void io_put_sq_data(struct io_sq_data *sqd) |
6c271ce2 | 8546 | { |
534ca6d6 | 8547 | if (refcount_dec_and_test(&sqd->refs)) { |
9e138a48 PB |
8548 | WARN_ON_ONCE(atomic_read(&sqd->park_pending)); |
8549 | ||
37d1e2e3 JA |
8550 | io_sq_thread_stop(sqd); |
8551 | kfree(sqd); | |
8552 | } | |
8553 | } | |
8554 | ||
8555 | static void io_sq_thread_finish(struct io_ring_ctx *ctx) | |
8556 | { | |
8557 | struct io_sq_data *sqd = ctx->sq_data; | |
8558 | ||
8559 | if (sqd) { | |
05962f95 | 8560 | io_sq_thread_park(sqd); |
521d6a73 | 8561 | list_del_init(&ctx->sqd_list); |
37d1e2e3 | 8562 | io_sqd_update_thread_idle(sqd); |
05962f95 | 8563 | io_sq_thread_unpark(sqd); |
37d1e2e3 JA |
8564 | |
8565 | io_put_sq_data(sqd); | |
8566 | ctx->sq_data = NULL; | |
534ca6d6 JA |
8567 | } |
8568 | } | |
8569 | ||
aa06165d JA |
8570 | static struct io_sq_data *io_attach_sq_data(struct io_uring_params *p) |
8571 | { | |
8572 | struct io_ring_ctx *ctx_attach; | |
8573 | struct io_sq_data *sqd; | |
8574 | struct fd f; | |
8575 | ||
8576 | f = fdget(p->wq_fd); | |
8577 | if (!f.file) | |
8578 | return ERR_PTR(-ENXIO); | |
8579 | if (f.file->f_op != &io_uring_fops) { | |
8580 | fdput(f); | |
8581 | return ERR_PTR(-EINVAL); | |
8582 | } | |
8583 | ||
8584 | ctx_attach = f.file->private_data; | |
8585 | sqd = ctx_attach->sq_data; | |
8586 | if (!sqd) { | |
8587 | fdput(f); | |
8588 | return ERR_PTR(-EINVAL); | |
8589 | } | |
5c2469e0 JA |
8590 | if (sqd->task_tgid != current->tgid) { |
8591 | fdput(f); | |
8592 | return ERR_PTR(-EPERM); | |
8593 | } | |
aa06165d JA |
8594 | |
8595 | refcount_inc(&sqd->refs); | |
8596 | fdput(f); | |
8597 | return sqd; | |
8598 | } | |
8599 | ||
26984fbf PB |
8600 | static struct io_sq_data *io_get_sq_data(struct io_uring_params *p, |
8601 | bool *attached) | |
534ca6d6 JA |
8602 | { |
8603 | struct io_sq_data *sqd; | |
8604 | ||
26984fbf | 8605 | *attached = false; |
5c2469e0 JA |
8606 | if (p->flags & IORING_SETUP_ATTACH_WQ) { |
8607 | sqd = io_attach_sq_data(p); | |
26984fbf PB |
8608 | if (!IS_ERR(sqd)) { |
8609 | *attached = true; | |
5c2469e0 | 8610 | return sqd; |
26984fbf | 8611 | } |
5c2469e0 JA |
8612 | /* fall through for EPERM case, setup new sqd/task */ |
8613 | if (PTR_ERR(sqd) != -EPERM) | |
8614 | return sqd; | |
8615 | } | |
aa06165d | 8616 | |
534ca6d6 JA |
8617 | sqd = kzalloc(sizeof(*sqd), GFP_KERNEL); |
8618 | if (!sqd) | |
8619 | return ERR_PTR(-ENOMEM); | |
8620 | ||
9e138a48 | 8621 | atomic_set(&sqd->park_pending, 0); |
534ca6d6 | 8622 | refcount_set(&sqd->refs, 1); |
69fb2131 | 8623 | INIT_LIST_HEAD(&sqd->ctx_list); |
09a6f4ef | 8624 | mutex_init(&sqd->lock); |
534ca6d6 | 8625 | init_waitqueue_head(&sqd->wait); |
37d1e2e3 | 8626 | init_completion(&sqd->exited); |
534ca6d6 JA |
8627 | return sqd; |
8628 | } | |
8629 | ||
6b06314c JA |
8630 | /* |
8631 | * Ensure the UNIX gc is aware of our file set, so we are certain that | |
8632 | * the io_uring can be safely unregistered on process exit, even if we have | |
1f59bc0f PB |
8633 | * loops in the file referencing. We account only files that can hold other |
8634 | * files because otherwise they can't form a loop and so are not interesting | |
8635 | * for GC. | |
6b06314c | 8636 | */ |
8b3171bd | 8637 | static int io_scm_file_account(struct io_ring_ctx *ctx, struct file *file) |
6b06314c | 8638 | { |
73b25d3b | 8639 | #if defined(CONFIG_UNIX) |
6b06314c | 8640 | struct sock *sk = ctx->ring_sock->sk; |
73b25d3b | 8641 | struct sk_buff_head *head = &sk->sk_receive_queue; |
6b06314c JA |
8642 | struct scm_fp_list *fpl; |
8643 | struct sk_buff *skb; | |
6b06314c | 8644 | |
73b25d3b PB |
8645 | if (likely(!io_file_need_scm(file))) |
8646 | return 0; | |
8647 | ||
8648 | /* | |
8649 | * See if we can merge this file into an existing skb SCM_RIGHTS | |
8650 | * file set. If there's no room, fall back to allocating a new skb | |
8651 | * and filling it in. | |
8652 | */ | |
8653 | spin_lock_irq(&head->lock); | |
8654 | skb = skb_peek(head); | |
8655 | if (skb && UNIXCB(skb).fp->count < SCM_MAX_FD) | |
8656 | __skb_unlink(skb, head); | |
8657 | else | |
8658 | skb = NULL; | |
8659 | spin_unlock_irq(&head->lock); | |
6b06314c | 8660 | |
6b06314c | 8661 | if (!skb) { |
73b25d3b PB |
8662 | fpl = kzalloc(sizeof(*fpl), GFP_KERNEL); |
8663 | if (!fpl) | |
8664 | return -ENOMEM; | |
6b06314c | 8665 | |
73b25d3b PB |
8666 | skb = alloc_skb(0, GFP_KERNEL); |
8667 | if (!skb) { | |
8668 | kfree(fpl); | |
8669 | return -ENOMEM; | |
8670 | } | |
6b06314c | 8671 | |
73b25d3b PB |
8672 | fpl->user = get_uid(current_user()); |
8673 | fpl->max = SCM_MAX_FD; | |
8674 | fpl->count = 0; | |
dca58c6a | 8675 | |
73b25d3b PB |
8676 | UNIXCB(skb).fp = fpl; |
8677 | skb->sk = sk; | |
8678 | skb->destructor = unix_destruct_scm; | |
8679 | refcount_add(skb->truesize, &sk->sk_wmem_alloc); | |
8680 | } | |
8681 | ||
8682 | fpl = UNIXCB(skb).fp; | |
8683 | fpl->fp[fpl->count++] = get_file(file); | |
8684 | unix_inflight(fpl->user, file); | |
8685 | skb_queue_head(head, skb); | |
dca58c6a | 8686 | fput(file); |
73b25d3b | 8687 | #endif |
6b06314c JA |
8688 | return 0; |
8689 | } | |
6b06314c | 8690 | |
47e90392 | 8691 | static void io_rsrc_file_put(struct io_ring_ctx *ctx, struct io_rsrc_put *prsrc) |
05f3fb3c | 8692 | { |
50238531 | 8693 | struct file *file = prsrc->file; |
05f3fb3c JA |
8694 | #if defined(CONFIG_UNIX) |
8695 | struct sock *sock = ctx->ring_sock->sk; | |
8696 | struct sk_buff_head list, *head = &sock->sk_receive_queue; | |
8697 | struct sk_buff *skb; | |
8698 | int i; | |
8699 | ||
1f59bc0f PB |
8700 | if (!io_file_need_scm(file)) { |
8701 | fput(file); | |
8702 | return; | |
8703 | } | |
8704 | ||
05f3fb3c JA |
8705 | __skb_queue_head_init(&list); |
8706 | ||
8707 | /* | |
8708 | * Find the skb that holds this file in its SCM_RIGHTS. When found, | |
8709 | * remove this entry and rearrange the file array. | |
8710 | */ | |
8711 | skb = skb_dequeue(head); | |
8712 | while (skb) { | |
8713 | struct scm_fp_list *fp; | |
8714 | ||
8715 | fp = UNIXCB(skb).fp; | |
8716 | for (i = 0; i < fp->count; i++) { | |
8717 | int left; | |
8718 | ||
8719 | if (fp->fp[i] != file) | |
8720 | continue; | |
8721 | ||
8722 | unix_notinflight(fp->user, fp->fp[i]); | |
8723 | left = fp->count - 1 - i; | |
8724 | if (left) { | |
8725 | memmove(&fp->fp[i], &fp->fp[i + 1], | |
8726 | left * sizeof(struct file *)); | |
8727 | } | |
8728 | fp->count--; | |
8729 | if (!fp->count) { | |
8730 | kfree_skb(skb); | |
8731 | skb = NULL; | |
8732 | } else { | |
8733 | __skb_queue_tail(&list, skb); | |
8734 | } | |
8735 | fput(file); | |
8736 | file = NULL; | |
8737 | break; | |
8738 | } | |
8739 | ||
8740 | if (!file) | |
8741 | break; | |
8742 | ||
8743 | __skb_queue_tail(&list, skb); | |
8744 | ||
8745 | skb = skb_dequeue(head); | |
8746 | } | |
8747 | ||
8748 | if (skb_peek(&list)) { | |
8749 | spin_lock_irq(&head->lock); | |
8750 | while ((skb = __skb_dequeue(&list)) != NULL) | |
8751 | __skb_queue_tail(head, skb); | |
8752 | spin_unlock_irq(&head->lock); | |
8753 | } | |
8754 | #else | |
8755 | fput(file); | |
8756 | #endif | |
8757 | } | |
8758 | ||
b895c9a6 | 8759 | static void __io_rsrc_put_work(struct io_rsrc_node *ref_node) |
65e19f54 | 8760 | { |
b895c9a6 | 8761 | struct io_rsrc_data *rsrc_data = ref_node->rsrc_data; |
269bbe5f BM |
8762 | struct io_ring_ctx *ctx = rsrc_data->ctx; |
8763 | struct io_rsrc_put *prsrc, *tmp; | |
05589553 | 8764 | |
269bbe5f BM |
8765 | list_for_each_entry_safe(prsrc, tmp, &ref_node->rsrc_list, list) { |
8766 | list_del(&prsrc->list); | |
b60c8dce PB |
8767 | |
8768 | if (prsrc->tag) { | |
f8929630 PB |
8769 | if (ctx->flags & IORING_SETUP_IOPOLL) |
8770 | mutex_lock(&ctx->uring_lock); | |
b60c8dce | 8771 | |
79ebeaee | 8772 | spin_lock(&ctx->completion_lock); |
913a571a | 8773 | io_fill_cqe_aux(ctx, prsrc->tag, 0, 0); |
b60c8dce | 8774 | io_commit_cqring(ctx); |
79ebeaee | 8775 | spin_unlock(&ctx->completion_lock); |
b60c8dce | 8776 | io_cqring_ev_posted(ctx); |
f8929630 PB |
8777 | |
8778 | if (ctx->flags & IORING_SETUP_IOPOLL) | |
8779 | mutex_unlock(&ctx->uring_lock); | |
b60c8dce PB |
8780 | } |
8781 | ||
40ae0ff7 | 8782 | rsrc_data->do_put(ctx, prsrc); |
269bbe5f | 8783 | kfree(prsrc); |
65e19f54 | 8784 | } |
05589553 | 8785 | |
28a9fe25 | 8786 | io_rsrc_node_destroy(ref_node); |
3e942498 PB |
8787 | if (atomic_dec_and_test(&rsrc_data->refs)) |
8788 | complete(&rsrc_data->done); | |
2faf852d | 8789 | } |
65e19f54 | 8790 | |
269bbe5f | 8791 | static void io_rsrc_put_work(struct work_struct *work) |
4a38aed2 JA |
8792 | { |
8793 | struct io_ring_ctx *ctx; | |
8794 | struct llist_node *node; | |
8795 | ||
269bbe5f BM |
8796 | ctx = container_of(work, struct io_ring_ctx, rsrc_put_work.work); |
8797 | node = llist_del_all(&ctx->rsrc_put_llist); | |
4a38aed2 JA |
8798 | |
8799 | while (node) { | |
b895c9a6 | 8800 | struct io_rsrc_node *ref_node; |
4a38aed2 JA |
8801 | struct llist_node *next = node->next; |
8802 | ||
b895c9a6 | 8803 | ref_node = llist_entry(node, struct io_rsrc_node, llist); |
269bbe5f | 8804 | __io_rsrc_put_work(ref_node); |
4a38aed2 JA |
8805 | node = next; |
8806 | } | |
8807 | } | |
8808 | ||
6b06314c | 8809 | static int io_sqe_files_register(struct io_ring_ctx *ctx, void __user *arg, |
792e3582 | 8810 | unsigned nr_args, u64 __user *tags) |
6b06314c JA |
8811 | { |
8812 | __s32 __user *fds = (__s32 __user *) arg; | |
05f3fb3c | 8813 | struct file *file; |
f3baed39 | 8814 | int fd, ret; |
846a4ef2 | 8815 | unsigned i; |
6b06314c | 8816 | |
05f3fb3c | 8817 | if (ctx->file_data) |
6b06314c JA |
8818 | return -EBUSY; |
8819 | if (!nr_args) | |
8820 | return -EINVAL; | |
8821 | if (nr_args > IORING_MAX_FIXED_FILES) | |
8822 | return -EMFILE; | |
3a1b8a4e PB |
8823 | if (nr_args > rlimit(RLIMIT_NOFILE)) |
8824 | return -EMFILE; | |
a7f0ed5a | 8825 | ret = io_rsrc_node_switch_start(ctx); |
f3baed39 PB |
8826 | if (ret) |
8827 | return ret; | |
d878c816 PB |
8828 | ret = io_rsrc_data_alloc(ctx, io_rsrc_file_put, tags, nr_args, |
8829 | &ctx->file_data); | |
8830 | if (ret) | |
8831 | return ret; | |
6b06314c | 8832 | |
a03a2a20 PB |
8833 | if (!io_alloc_file_tables(&ctx->file_table, nr_args)) { |
8834 | io_rsrc_data_free(ctx->file_data); | |
8835 | ctx->file_data = NULL; | |
8836 | return -ENOMEM; | |
8837 | } | |
65e19f54 | 8838 | |
08a45173 | 8839 | for (i = 0; i < nr_args; i++, ctx->nr_user_files++) { |
a03a2a20 PB |
8840 | struct io_fixed_file *file_slot; |
8841 | ||
d878c816 | 8842 | if (copy_from_user(&fd, &fds[i], sizeof(fd))) { |
600cf3f8 | 8843 | ret = -EFAULT; |
a03a2a20 | 8844 | goto fail; |
600cf3f8 | 8845 | } |
08a45173 | 8846 | /* allow sparse sets */ |
792e3582 PB |
8847 | if (fd == -1) { |
8848 | ret = -EINVAL; | |
2d091d62 | 8849 | if (unlikely(*io_get_tag_slot(ctx->file_data, i))) |
a03a2a20 | 8850 | goto fail; |
08a45173 | 8851 | continue; |
792e3582 | 8852 | } |
6b06314c | 8853 | |
05f3fb3c | 8854 | file = fget(fd); |
6b06314c | 8855 | ret = -EBADF; |
792e3582 | 8856 | if (unlikely(!file)) |
a03a2a20 | 8857 | goto fail; |
05f3fb3c | 8858 | |
6b06314c JA |
8859 | /* |
8860 | * Don't allow io_uring instances to be registered. If UNIX | |
8861 | * isn't enabled, then this causes a reference cycle and this | |
8862 | * instance can never get freed. If UNIX is enabled we'll | |
8863 | * handle it just fine, but there's still no point in allowing | |
8864 | * a ring fd as it doesn't support regular read/write anyway. | |
8865 | */ | |
05f3fb3c JA |
8866 | if (file->f_op == &io_uring_fops) { |
8867 | fput(file); | |
a03a2a20 PB |
8868 | goto fail; |
8869 | } | |
8b3171bd | 8870 | ret = io_scm_file_account(ctx, file); |
a03a2a20 | 8871 | if (ret) { |
a03a2a20 PB |
8872 | fput(file); |
8873 | goto fail; | |
6b06314c | 8874 | } |
e390510a PB |
8875 | file_slot = io_fixed_file_slot(&ctx->file_table, i); |
8876 | io_fixed_file_set(file_slot, file); | |
05589553 | 8877 | } |
6b06314c | 8878 | |
a7f0ed5a | 8879 | io_rsrc_node_switch(ctx, NULL); |
a03a2a20 PB |
8880 | return 0; |
8881 | fail: | |
8882 | __io_sqe_files_unregister(ctx); | |
6b06314c JA |
8883 | return ret; |
8884 | } | |
8885 | ||
9c7b0ba8 PB |
8886 | static int io_queue_rsrc_removal(struct io_rsrc_data *data, unsigned idx, |
8887 | struct io_rsrc_node *node, void *rsrc) | |
8888 | { | |
8f0a2480 | 8889 | u64 *tag_slot = io_get_tag_slot(data, idx); |
9c7b0ba8 PB |
8890 | struct io_rsrc_put *prsrc; |
8891 | ||
8892 | prsrc = kzalloc(sizeof(*prsrc), GFP_KERNEL); | |
8893 | if (!prsrc) | |
8894 | return -ENOMEM; | |
8895 | ||
8f0a2480 PB |
8896 | prsrc->tag = *tag_slot; |
8897 | *tag_slot = 0; | |
9c7b0ba8 PB |
8898 | prsrc->rsrc = rsrc; |
8899 | list_add(&prsrc->list, &node->rsrc_list); | |
8900 | return 0; | |
8901 | } | |
8902 | ||
b9445598 PB |
8903 | static int io_install_fixed_file(struct io_kiocb *req, struct file *file, |
8904 | unsigned int issue_flags, u32 slot_index) | |
8905 | { | |
8906 | struct io_ring_ctx *ctx = req->ctx; | |
9c7b0ba8 | 8907 | bool needs_switch = false; |
b9445598 PB |
8908 | struct io_fixed_file *file_slot; |
8909 | int ret = -EBADF; | |
8910 | ||
f8929630 | 8911 | io_ring_submit_lock(ctx, issue_flags); |
b9445598 PB |
8912 | if (file->f_op == &io_uring_fops) |
8913 | goto err; | |
8914 | ret = -ENXIO; | |
8915 | if (!ctx->file_data) | |
8916 | goto err; | |
8917 | ret = -EINVAL; | |
8918 | if (slot_index >= ctx->nr_user_files) | |
8919 | goto err; | |
8920 | ||
8921 | slot_index = array_index_nospec(slot_index, ctx->nr_user_files); | |
8922 | file_slot = io_fixed_file_slot(&ctx->file_table, slot_index); | |
9c7b0ba8 PB |
8923 | |
8924 | if (file_slot->file_ptr) { | |
8925 | struct file *old_file; | |
8926 | ||
8927 | ret = io_rsrc_node_switch_start(ctx); | |
8928 | if (ret) | |
8929 | goto err; | |
8930 | ||
8931 | old_file = (struct file *)(file_slot->file_ptr & FFS_MASK); | |
8932 | ret = io_queue_rsrc_removal(ctx->file_data, slot_index, | |
8933 | ctx->rsrc_node, old_file); | |
8934 | if (ret) | |
8935 | goto err; | |
8936 | file_slot->file_ptr = 0; | |
8937 | needs_switch = true; | |
8938 | } | |
b9445598 | 8939 | |
8b3171bd | 8940 | ret = io_scm_file_account(ctx, file); |
e390510a PB |
8941 | if (!ret) { |
8942 | *io_get_tag_slot(ctx->file_data, slot_index) = 0; | |
8943 | io_fixed_file_set(file_slot, file); | |
b9445598 | 8944 | } |
b9445598 | 8945 | err: |
9c7b0ba8 PB |
8946 | if (needs_switch) |
8947 | io_rsrc_node_switch(ctx, ctx->file_data); | |
f8929630 | 8948 | io_ring_submit_unlock(ctx, issue_flags); |
b9445598 PB |
8949 | if (ret) |
8950 | fput(file); | |
8951 | return ret; | |
8952 | } | |
8953 | ||
7df778be PB |
8954 | static int io_close_fixed(struct io_kiocb *req, unsigned int issue_flags) |
8955 | { | |
8956 | unsigned int offset = req->close.file_slot - 1; | |
8957 | struct io_ring_ctx *ctx = req->ctx; | |
8958 | struct io_fixed_file *file_slot; | |
8959 | struct file *file; | |
4cdd158b | 8960 | int ret; |
7df778be | 8961 | |
f8929630 | 8962 | io_ring_submit_lock(ctx, issue_flags); |
7df778be PB |
8963 | ret = -ENXIO; |
8964 | if (unlikely(!ctx->file_data)) | |
8965 | goto out; | |
8966 | ret = -EINVAL; | |
8967 | if (offset >= ctx->nr_user_files) | |
8968 | goto out; | |
8969 | ret = io_rsrc_node_switch_start(ctx); | |
8970 | if (ret) | |
8971 | goto out; | |
8972 | ||
4cdd158b PB |
8973 | offset = array_index_nospec(offset, ctx->nr_user_files); |
8974 | file_slot = io_fixed_file_slot(&ctx->file_table, offset); | |
7df778be PB |
8975 | ret = -EBADF; |
8976 | if (!file_slot->file_ptr) | |
8977 | goto out; | |
8978 | ||
8979 | file = (struct file *)(file_slot->file_ptr & FFS_MASK); | |
8980 | ret = io_queue_rsrc_removal(ctx->file_data, offset, ctx->rsrc_node, file); | |
8981 | if (ret) | |
8982 | goto out; | |
8983 | ||
8984 | file_slot->file_ptr = 0; | |
8985 | io_rsrc_node_switch(ctx, ctx->file_data); | |
8986 | ret = 0; | |
8987 | out: | |
f8929630 | 8988 | io_ring_submit_unlock(ctx, issue_flags); |
7df778be PB |
8989 | return ret; |
8990 | } | |
8991 | ||
05f3fb3c | 8992 | static int __io_sqe_files_update(struct io_ring_ctx *ctx, |
c3bdad02 | 8993 | struct io_uring_rsrc_update2 *up, |
05f3fb3c JA |
8994 | unsigned nr_args) |
8995 | { | |
c3bdad02 | 8996 | u64 __user *tags = u64_to_user_ptr(up->tags); |
98f0b3b4 | 8997 | __s32 __user *fds = u64_to_user_ptr(up->data); |
b895c9a6 | 8998 | struct io_rsrc_data *data = ctx->file_data; |
a04b0ac0 PB |
8999 | struct io_fixed_file *file_slot; |
9000 | struct file *file; | |
98f0b3b4 PB |
9001 | int fd, i, err = 0; |
9002 | unsigned int done; | |
05589553 | 9003 | bool needs_switch = false; |
c3a31e60 | 9004 | |
98f0b3b4 PB |
9005 | if (!ctx->file_data) |
9006 | return -ENXIO; | |
9007 | if (up->offset + nr_args > ctx->nr_user_files) | |
c3a31e60 JA |
9008 | return -EINVAL; |
9009 | ||
67973b93 | 9010 | for (done = 0; done < nr_args; done++) { |
c3bdad02 PB |
9011 | u64 tag = 0; |
9012 | ||
9013 | if ((tags && copy_from_user(&tag, &tags[done], sizeof(tag))) || | |
9014 | copy_from_user(&fd, &fds[done], sizeof(fd))) { | |
c3a31e60 JA |
9015 | err = -EFAULT; |
9016 | break; | |
9017 | } | |
c3bdad02 PB |
9018 | if ((fd == IORING_REGISTER_FILES_SKIP || fd == -1) && tag) { |
9019 | err = -EINVAL; | |
9020 | break; | |
9021 | } | |
4e0377a1 | 9022 | if (fd == IORING_REGISTER_FILES_SKIP) |
9023 | continue; | |
9024 | ||
67973b93 | 9025 | i = array_index_nospec(up->offset + done, ctx->nr_user_files); |
aeca241b | 9026 | file_slot = io_fixed_file_slot(&ctx->file_table, i); |
ea64ec02 | 9027 | |
a04b0ac0 PB |
9028 | if (file_slot->file_ptr) { |
9029 | file = (struct file *)(file_slot->file_ptr & FFS_MASK); | |
4cdd158b | 9030 | err = io_queue_rsrc_removal(data, i, ctx->rsrc_node, file); |
a5318d3c HD |
9031 | if (err) |
9032 | break; | |
a04b0ac0 | 9033 | file_slot->file_ptr = 0; |
05589553 | 9034 | needs_switch = true; |
c3a31e60 JA |
9035 | } |
9036 | if (fd != -1) { | |
c3a31e60 JA |
9037 | file = fget(fd); |
9038 | if (!file) { | |
9039 | err = -EBADF; | |
9040 | break; | |
9041 | } | |
9042 | /* | |
9043 | * Don't allow io_uring instances to be registered. If | |
9044 | * UNIX isn't enabled, then this causes a reference | |
9045 | * cycle and this instance can never get freed. If UNIX | |
9046 | * is enabled we'll handle it just fine, but there's | |
9047 | * still no point in allowing a ring fd as it doesn't | |
9048 | * support regular read/write anyway. | |
9049 | */ | |
9050 | if (file->f_op == &io_uring_fops) { | |
9051 | fput(file); | |
9052 | err = -EBADF; | |
9053 | break; | |
9054 | } | |
8b3171bd | 9055 | err = io_scm_file_account(ctx, file); |
f3bd9dae YY |
9056 | if (err) { |
9057 | fput(file); | |
c3a31e60 | 9058 | break; |
f3bd9dae | 9059 | } |
e390510a PB |
9060 | *io_get_tag_slot(data, i) = tag; |
9061 | io_fixed_file_set(file_slot, file); | |
c3a31e60 | 9062 | } |
05f3fb3c JA |
9063 | } |
9064 | ||
a7f0ed5a PB |
9065 | if (needs_switch) |
9066 | io_rsrc_node_switch(ctx, data); | |
c3a31e60 JA |
9067 | return done ? done : err; |
9068 | } | |
05589553 | 9069 | |
685fe7fe JA |
9070 | static struct io_wq *io_init_wq_offload(struct io_ring_ctx *ctx, |
9071 | struct task_struct *task) | |
24369c2e | 9072 | { |
e941894e | 9073 | struct io_wq_hash *hash; |
24369c2e | 9074 | struct io_wq_data data; |
24369c2e | 9075 | unsigned int concurrency; |
24369c2e | 9076 | |
362a9e65 | 9077 | mutex_lock(&ctx->uring_lock); |
e941894e JA |
9078 | hash = ctx->hash_map; |
9079 | if (!hash) { | |
9080 | hash = kzalloc(sizeof(*hash), GFP_KERNEL); | |
362a9e65 YY |
9081 | if (!hash) { |
9082 | mutex_unlock(&ctx->uring_lock); | |
e941894e | 9083 | return ERR_PTR(-ENOMEM); |
362a9e65 | 9084 | } |
e941894e JA |
9085 | refcount_set(&hash->refs, 1); |
9086 | init_waitqueue_head(&hash->wait); | |
9087 | ctx->hash_map = hash; | |
24369c2e | 9088 | } |
362a9e65 | 9089 | mutex_unlock(&ctx->uring_lock); |
24369c2e | 9090 | |
e941894e | 9091 | data.hash = hash; |
685fe7fe | 9092 | data.task = task; |
ebc11b6c | 9093 | data.free_work = io_wq_free_work; |
f5fa38c5 | 9094 | data.do_work = io_wq_submit_work; |
24369c2e | 9095 | |
d25e3a3d JA |
9096 | /* Do QD, or 4 * CPUS, whatever is smallest */ |
9097 | concurrency = min(ctx->sq_entries, 4 * num_online_cpus()); | |
24369c2e | 9098 | |
5aa75ed5 | 9099 | return io_wq_create(concurrency, &data); |
24369c2e PB |
9100 | } |
9101 | ||
c072481d PB |
9102 | static __cold int io_uring_alloc_task_context(struct task_struct *task, |
9103 | struct io_ring_ctx *ctx) | |
0f212204 JA |
9104 | { |
9105 | struct io_uring_task *tctx; | |
d8a6df10 | 9106 | int ret; |
0f212204 | 9107 | |
09899b19 | 9108 | tctx = kzalloc(sizeof(*tctx), GFP_KERNEL); |
0f212204 JA |
9109 | if (unlikely(!tctx)) |
9110 | return -ENOMEM; | |
9111 | ||
e7a6c00d JA |
9112 | tctx->registered_rings = kcalloc(IO_RINGFD_REG_MAX, |
9113 | sizeof(struct file *), GFP_KERNEL); | |
9114 | if (unlikely(!tctx->registered_rings)) { | |
9115 | kfree(tctx); | |
9116 | return -ENOMEM; | |
9117 | } | |
9118 | ||
d8a6df10 JA |
9119 | ret = percpu_counter_init(&tctx->inflight, 0, GFP_KERNEL); |
9120 | if (unlikely(ret)) { | |
e7a6c00d | 9121 | kfree(tctx->registered_rings); |
d8a6df10 JA |
9122 | kfree(tctx); |
9123 | return ret; | |
9124 | } | |
9125 | ||
685fe7fe | 9126 | tctx->io_wq = io_init_wq_offload(ctx, task); |
5aa75ed5 JA |
9127 | if (IS_ERR(tctx->io_wq)) { |
9128 | ret = PTR_ERR(tctx->io_wq); | |
9129 | percpu_counter_destroy(&tctx->inflight); | |
e7a6c00d | 9130 | kfree(tctx->registered_rings); |
5aa75ed5 JA |
9131 | kfree(tctx); |
9132 | return ret; | |
9133 | } | |
9134 | ||
0f212204 JA |
9135 | xa_init(&tctx->xa); |
9136 | init_waitqueue_head(&tctx->wait); | |
fdaf083c | 9137 | atomic_set(&tctx->in_idle, 0); |
0f212204 | 9138 | task->io_uring = tctx; |
7cbf1722 JA |
9139 | spin_lock_init(&tctx->task_lock); |
9140 | INIT_WQ_LIST(&tctx->task_list); | |
4813c377 | 9141 | INIT_WQ_LIST(&tctx->prior_task_list); |
7cbf1722 | 9142 | init_task_work(&tctx->task_work, tctx_task_work); |
0f212204 JA |
9143 | return 0; |
9144 | } | |
9145 | ||
9146 | void __io_uring_free(struct task_struct *tsk) | |
9147 | { | |
9148 | struct io_uring_task *tctx = tsk->io_uring; | |
9149 | ||
9150 | WARN_ON_ONCE(!xa_empty(&tctx->xa)); | |
ef8eaa4e | 9151 | WARN_ON_ONCE(tctx->io_wq); |
09899b19 | 9152 | WARN_ON_ONCE(tctx->cached_refs); |
ef8eaa4e | 9153 | |
e7a6c00d | 9154 | kfree(tctx->registered_rings); |
d8a6df10 | 9155 | percpu_counter_destroy(&tctx->inflight); |
0f212204 JA |
9156 | kfree(tctx); |
9157 | tsk->io_uring = NULL; | |
9158 | } | |
9159 | ||
c072481d PB |
9160 | static __cold int io_sq_offload_create(struct io_ring_ctx *ctx, |
9161 | struct io_uring_params *p) | |
2b188cc1 JA |
9162 | { |
9163 | int ret; | |
9164 | ||
d25e3a3d JA |
9165 | /* Retain compatibility with failing for an invalid attach attempt */ |
9166 | if ((ctx->flags & (IORING_SETUP_ATTACH_WQ | IORING_SETUP_SQPOLL)) == | |
9167 | IORING_SETUP_ATTACH_WQ) { | |
9168 | struct fd f; | |
9169 | ||
9170 | f = fdget(p->wq_fd); | |
9171 | if (!f.file) | |
9172 | return -ENXIO; | |
0cc936f7 JA |
9173 | if (f.file->f_op != &io_uring_fops) { |
9174 | fdput(f); | |
f2a48dd0 | 9175 | return -EINVAL; |
0cc936f7 JA |
9176 | } |
9177 | fdput(f); | |
d25e3a3d | 9178 | } |
6c271ce2 | 9179 | if (ctx->flags & IORING_SETUP_SQPOLL) { |
46fe18b1 | 9180 | struct task_struct *tsk; |
534ca6d6 | 9181 | struct io_sq_data *sqd; |
26984fbf | 9182 | bool attached; |
534ca6d6 | 9183 | |
cdc1404a PM |
9184 | ret = security_uring_sqpoll(); |
9185 | if (ret) | |
9186 | return ret; | |
9187 | ||
26984fbf | 9188 | sqd = io_get_sq_data(p, &attached); |
534ca6d6 JA |
9189 | if (IS_ERR(sqd)) { |
9190 | ret = PTR_ERR(sqd); | |
9191 | goto err; | |
9192 | } | |
69fb2131 | 9193 | |
7c30f36a | 9194 | ctx->sq_creds = get_current_cred(); |
534ca6d6 | 9195 | ctx->sq_data = sqd; |
917257da JA |
9196 | ctx->sq_thread_idle = msecs_to_jiffies(p->sq_thread_idle); |
9197 | if (!ctx->sq_thread_idle) | |
9198 | ctx->sq_thread_idle = HZ; | |
9199 | ||
78d7f6ba | 9200 | io_sq_thread_park(sqd); |
de75a3d3 PB |
9201 | list_add(&ctx->sqd_list, &sqd->ctx_list); |
9202 | io_sqd_update_thread_idle(sqd); | |
26984fbf | 9203 | /* don't attach to a dying SQPOLL thread, would be racy */ |
f2a48dd0 | 9204 | ret = (attached && !sqd->thread) ? -ENXIO : 0; |
78d7f6ba PB |
9205 | io_sq_thread_unpark(sqd); |
9206 | ||
de75a3d3 PB |
9207 | if (ret < 0) |
9208 | goto err; | |
9209 | if (attached) | |
5aa75ed5 | 9210 | return 0; |
aa06165d | 9211 | |
6c271ce2 | 9212 | if (p->flags & IORING_SETUP_SQ_AFF) { |
44a9bd18 | 9213 | int cpu = p->sq_thread_cpu; |
6c271ce2 | 9214 | |
917257da | 9215 | ret = -EINVAL; |
f2a48dd0 | 9216 | if (cpu >= nr_cpu_ids || !cpu_online(cpu)) |
e8f98f24 | 9217 | goto err_sqpoll; |
37d1e2e3 | 9218 | sqd->sq_cpu = cpu; |
6c271ce2 | 9219 | } else { |
37d1e2e3 | 9220 | sqd->sq_cpu = -1; |
6c271ce2 | 9221 | } |
37d1e2e3 JA |
9222 | |
9223 | sqd->task_pid = current->pid; | |
5c2469e0 | 9224 | sqd->task_tgid = current->tgid; |
46fe18b1 JA |
9225 | tsk = create_io_thread(io_sq_thread, sqd, NUMA_NO_NODE); |
9226 | if (IS_ERR(tsk)) { | |
9227 | ret = PTR_ERR(tsk); | |
e8f98f24 | 9228 | goto err_sqpoll; |
6c271ce2 | 9229 | } |
97a73a0f | 9230 | |
46fe18b1 | 9231 | sqd->thread = tsk; |
97a73a0f | 9232 | ret = io_uring_alloc_task_context(tsk, ctx); |
46fe18b1 | 9233 | wake_up_new_task(tsk); |
0f212204 JA |
9234 | if (ret) |
9235 | goto err; | |
6c271ce2 JA |
9236 | } else if (p->flags & IORING_SETUP_SQ_AFF) { |
9237 | /* Can't have SQ_AFF without SQPOLL */ | |
9238 | ret = -EINVAL; | |
9239 | goto err; | |
9240 | } | |
9241 | ||
2b188cc1 | 9242 | return 0; |
f2a48dd0 PB |
9243 | err_sqpoll: |
9244 | complete(&ctx->sq_data->exited); | |
2b188cc1 | 9245 | err: |
37d1e2e3 | 9246 | io_sq_thread_finish(ctx); |
2b188cc1 JA |
9247 | return ret; |
9248 | } | |
9249 | ||
a087e2b5 BM |
9250 | static inline void __io_unaccount_mem(struct user_struct *user, |
9251 | unsigned long nr_pages) | |
2b188cc1 JA |
9252 | { |
9253 | atomic_long_sub(nr_pages, &user->locked_vm); | |
9254 | } | |
9255 | ||
a087e2b5 BM |
9256 | static inline int __io_account_mem(struct user_struct *user, |
9257 | unsigned long nr_pages) | |
2b188cc1 JA |
9258 | { |
9259 | unsigned long page_limit, cur_pages, new_pages; | |
9260 | ||
9261 | /* Don't allow more pages than we can safely lock */ | |
9262 | page_limit = rlimit(RLIMIT_MEMLOCK) >> PAGE_SHIFT; | |
9263 | ||
9264 | do { | |
9265 | cur_pages = atomic_long_read(&user->locked_vm); | |
9266 | new_pages = cur_pages + nr_pages; | |
9267 | if (new_pages > page_limit) | |
9268 | return -ENOMEM; | |
9269 | } while (atomic_long_cmpxchg(&user->locked_vm, cur_pages, | |
9270 | new_pages) != cur_pages); | |
9271 | ||
9272 | return 0; | |
9273 | } | |
9274 | ||
26bfa89e | 9275 | static void io_unaccount_mem(struct io_ring_ctx *ctx, unsigned long nr_pages) |
a087e2b5 | 9276 | { |
62e398be | 9277 | if (ctx->user) |
a087e2b5 | 9278 | __io_unaccount_mem(ctx->user, nr_pages); |
30975825 | 9279 | |
26bfa89e JA |
9280 | if (ctx->mm_account) |
9281 | atomic64_sub(nr_pages, &ctx->mm_account->pinned_vm); | |
a087e2b5 BM |
9282 | } |
9283 | ||
26bfa89e | 9284 | static int io_account_mem(struct io_ring_ctx *ctx, unsigned long nr_pages) |
a087e2b5 | 9285 | { |
30975825 BM |
9286 | int ret; |
9287 | ||
62e398be | 9288 | if (ctx->user) { |
30975825 BM |
9289 | ret = __io_account_mem(ctx->user, nr_pages); |
9290 | if (ret) | |
9291 | return ret; | |
9292 | } | |
9293 | ||
26bfa89e JA |
9294 | if (ctx->mm_account) |
9295 | atomic64_add(nr_pages, &ctx->mm_account->pinned_vm); | |
a087e2b5 BM |
9296 | |
9297 | return 0; | |
9298 | } | |
9299 | ||
2b188cc1 JA |
9300 | static void io_mem_free(void *ptr) |
9301 | { | |
52e04ef4 MR |
9302 | struct page *page; |
9303 | ||
9304 | if (!ptr) | |
9305 | return; | |
2b188cc1 | 9306 | |
52e04ef4 | 9307 | page = virt_to_head_page(ptr); |
2b188cc1 JA |
9308 | if (put_page_testzero(page)) |
9309 | free_compound_page(page); | |
9310 | } | |
9311 | ||
9312 | static void *io_mem_alloc(size_t size) | |
9313 | { | |
0a3f1e0b | 9314 | gfp_t gfp = GFP_KERNEL_ACCOUNT | __GFP_ZERO | __GFP_NOWARN | __GFP_COMP; |
2b188cc1 | 9315 | |
0a3f1e0b | 9316 | return (void *) __get_free_pages(gfp, get_order(size)); |
2b188cc1 JA |
9317 | } |
9318 | ||
75b28aff HV |
9319 | static unsigned long rings_size(unsigned sq_entries, unsigned cq_entries, |
9320 | size_t *sq_offset) | |
9321 | { | |
9322 | struct io_rings *rings; | |
9323 | size_t off, sq_array_size; | |
9324 | ||
9325 | off = struct_size(rings, cqes, cq_entries); | |
9326 | if (off == SIZE_MAX) | |
9327 | return SIZE_MAX; | |
9328 | ||
9329 | #ifdef CONFIG_SMP | |
9330 | off = ALIGN(off, SMP_CACHE_BYTES); | |
9331 | if (off == 0) | |
9332 | return SIZE_MAX; | |
9333 | #endif | |
9334 | ||
b36200f5 DV |
9335 | if (sq_offset) |
9336 | *sq_offset = off; | |
9337 | ||
75b28aff HV |
9338 | sq_array_size = array_size(sizeof(u32), sq_entries); |
9339 | if (sq_array_size == SIZE_MAX) | |
9340 | return SIZE_MAX; | |
9341 | ||
9342 | if (check_add_overflow(off, sq_array_size, &off)) | |
9343 | return SIZE_MAX; | |
9344 | ||
75b28aff HV |
9345 | return off; |
9346 | } | |
9347 | ||
41edf1a5 | 9348 | static void io_buffer_unmap(struct io_ring_ctx *ctx, struct io_mapped_ubuf **slot) |
7f61a1e9 | 9349 | { |
41edf1a5 | 9350 | struct io_mapped_ubuf *imu = *slot; |
7f61a1e9 PB |
9351 | unsigned int i; |
9352 | ||
6224843d PB |
9353 | if (imu != ctx->dummy_ubuf) { |
9354 | for (i = 0; i < imu->nr_bvecs; i++) | |
9355 | unpin_user_page(imu->bvec[i].bv_page); | |
9356 | if (imu->acct_pages) | |
9357 | io_unaccount_mem(ctx, imu->acct_pages); | |
9358 | kvfree(imu); | |
9359 | } | |
41edf1a5 | 9360 | *slot = NULL; |
7f61a1e9 PB |
9361 | } |
9362 | ||
bd54b6fe | 9363 | static void io_rsrc_buf_put(struct io_ring_ctx *ctx, struct io_rsrc_put *prsrc) |
edafccee | 9364 | { |
634d00df PB |
9365 | io_buffer_unmap(ctx, &prsrc->buf); |
9366 | prsrc->buf = NULL; | |
bd54b6fe | 9367 | } |
edafccee | 9368 | |
bd54b6fe BM |
9369 | static void __io_sqe_buffers_unregister(struct io_ring_ctx *ctx) |
9370 | { | |
9371 | unsigned int i; | |
edafccee | 9372 | |
7f61a1e9 PB |
9373 | for (i = 0; i < ctx->nr_user_bufs; i++) |
9374 | io_buffer_unmap(ctx, &ctx->user_bufs[i]); | |
edafccee | 9375 | kfree(ctx->user_bufs); |
bb6659cc | 9376 | io_rsrc_data_free(ctx->buf_data); |
edafccee | 9377 | ctx->user_bufs = NULL; |
bd54b6fe | 9378 | ctx->buf_data = NULL; |
edafccee | 9379 | ctx->nr_user_bufs = 0; |
bd54b6fe BM |
9380 | } |
9381 | ||
0a96bbe4 | 9382 | static int io_sqe_buffers_unregister(struct io_ring_ctx *ctx) |
edafccee | 9383 | { |
bd54b6fe | 9384 | int ret; |
edafccee | 9385 | |
bd54b6fe | 9386 | if (!ctx->buf_data) |
edafccee JA |
9387 | return -ENXIO; |
9388 | ||
bd54b6fe BM |
9389 | ret = io_rsrc_ref_quiesce(ctx->buf_data, ctx); |
9390 | if (!ret) | |
9391 | __io_sqe_buffers_unregister(ctx); | |
9392 | return ret; | |
edafccee JA |
9393 | } |
9394 | ||
9395 | static int io_copy_iov(struct io_ring_ctx *ctx, struct iovec *dst, | |
9396 | void __user *arg, unsigned index) | |
9397 | { | |
9398 | struct iovec __user *src; | |
9399 | ||
9400 | #ifdef CONFIG_COMPAT | |
9401 | if (ctx->compat) { | |
9402 | struct compat_iovec __user *ciovs; | |
9403 | struct compat_iovec ciov; | |
9404 | ||
9405 | ciovs = (struct compat_iovec __user *) arg; | |
9406 | if (copy_from_user(&ciov, &ciovs[index], sizeof(ciov))) | |
9407 | return -EFAULT; | |
9408 | ||
d55e5f5b | 9409 | dst->iov_base = u64_to_user_ptr((u64)ciov.iov_base); |
edafccee JA |
9410 | dst->iov_len = ciov.iov_len; |
9411 | return 0; | |
9412 | } | |
9413 | #endif | |
9414 | src = (struct iovec __user *) arg; | |
9415 | if (copy_from_user(dst, &src[index], sizeof(*dst))) | |
9416 | return -EFAULT; | |
9417 | return 0; | |
9418 | } | |
9419 | ||
de293938 JA |
9420 | /* |
9421 | * Not super efficient, but this is just a registration time. And we do cache | |
9422 | * the last compound head, so generally we'll only do a full search if we don't | |
9423 | * match that one. | |
9424 | * | |
9425 | * We check if the given compound head page has already been accounted, to | |
9426 | * avoid double accounting it. This allows us to account the full size of the | |
9427 | * page, not just the constituent pages of a huge page. | |
9428 | */ | |
9429 | static bool headpage_already_acct(struct io_ring_ctx *ctx, struct page **pages, | |
9430 | int nr_pages, struct page *hpage) | |
9431 | { | |
9432 | int i, j; | |
9433 | ||
9434 | /* check current page array */ | |
9435 | for (i = 0; i < nr_pages; i++) { | |
9436 | if (!PageCompound(pages[i])) | |
9437 | continue; | |
9438 | if (compound_head(pages[i]) == hpage) | |
9439 | return true; | |
9440 | } | |
9441 | ||
9442 | /* check previously registered pages */ | |
9443 | for (i = 0; i < ctx->nr_user_bufs; i++) { | |
41edf1a5 | 9444 | struct io_mapped_ubuf *imu = ctx->user_bufs[i]; |
de293938 JA |
9445 | |
9446 | for (j = 0; j < imu->nr_bvecs; j++) { | |
9447 | if (!PageCompound(imu->bvec[j].bv_page)) | |
9448 | continue; | |
9449 | if (compound_head(imu->bvec[j].bv_page) == hpage) | |
9450 | return true; | |
9451 | } | |
9452 | } | |
9453 | ||
9454 | return false; | |
9455 | } | |
9456 | ||
9457 | static int io_buffer_account_pin(struct io_ring_ctx *ctx, struct page **pages, | |
9458 | int nr_pages, struct io_mapped_ubuf *imu, | |
9459 | struct page **last_hpage) | |
9460 | { | |
9461 | int i, ret; | |
9462 | ||
216e5835 | 9463 | imu->acct_pages = 0; |
de293938 JA |
9464 | for (i = 0; i < nr_pages; i++) { |
9465 | if (!PageCompound(pages[i])) { | |
9466 | imu->acct_pages++; | |
9467 | } else { | |
9468 | struct page *hpage; | |
9469 | ||
9470 | hpage = compound_head(pages[i]); | |
9471 | if (hpage == *last_hpage) | |
9472 | continue; | |
9473 | *last_hpage = hpage; | |
9474 | if (headpage_already_acct(ctx, pages, i, hpage)) | |
9475 | continue; | |
9476 | imu->acct_pages += page_size(hpage) >> PAGE_SHIFT; | |
9477 | } | |
9478 | } | |
9479 | ||
9480 | if (!imu->acct_pages) | |
9481 | return 0; | |
9482 | ||
26bfa89e | 9483 | ret = io_account_mem(ctx, imu->acct_pages); |
de293938 JA |
9484 | if (ret) |
9485 | imu->acct_pages = 0; | |
9486 | return ret; | |
9487 | } | |
9488 | ||
0a96bbe4 | 9489 | static int io_sqe_buffer_register(struct io_ring_ctx *ctx, struct iovec *iov, |
41edf1a5 | 9490 | struct io_mapped_ubuf **pimu, |
0a96bbe4 | 9491 | struct page **last_hpage) |
edafccee | 9492 | { |
41edf1a5 | 9493 | struct io_mapped_ubuf *imu = NULL; |
edafccee JA |
9494 | struct vm_area_struct **vmas = NULL; |
9495 | struct page **pages = NULL; | |
0a96bbe4 BM |
9496 | unsigned long off, start, end, ubuf; |
9497 | size_t size; | |
9498 | int ret, pret, nr_pages, i; | |
9499 | ||
6224843d PB |
9500 | if (!iov->iov_base) { |
9501 | *pimu = ctx->dummy_ubuf; | |
9502 | return 0; | |
9503 | } | |
9504 | ||
0a96bbe4 BM |
9505 | ubuf = (unsigned long) iov->iov_base; |
9506 | end = (ubuf + iov->iov_len + PAGE_SIZE - 1) >> PAGE_SHIFT; | |
9507 | start = ubuf >> PAGE_SHIFT; | |
9508 | nr_pages = end - start; | |
9509 | ||
41edf1a5 | 9510 | *pimu = NULL; |
0a96bbe4 BM |
9511 | ret = -ENOMEM; |
9512 | ||
9513 | pages = kvmalloc_array(nr_pages, sizeof(struct page *), GFP_KERNEL); | |
9514 | if (!pages) | |
9515 | goto done; | |
9516 | ||
9517 | vmas = kvmalloc_array(nr_pages, sizeof(struct vm_area_struct *), | |
9518 | GFP_KERNEL); | |
9519 | if (!vmas) | |
9520 | goto done; | |
edafccee | 9521 | |
41edf1a5 | 9522 | imu = kvmalloc(struct_size(imu, bvec, nr_pages), GFP_KERNEL); |
a2b4198c | 9523 | if (!imu) |
0a96bbe4 BM |
9524 | goto done; |
9525 | ||
9526 | ret = 0; | |
9527 | mmap_read_lock(current->mm); | |
9528 | pret = pin_user_pages(ubuf, nr_pages, FOLL_WRITE | FOLL_LONGTERM, | |
9529 | pages, vmas); | |
9530 | if (pret == nr_pages) { | |
9531 | /* don't support file backed memory */ | |
9532 | for (i = 0; i < nr_pages; i++) { | |
9533 | struct vm_area_struct *vma = vmas[i]; | |
9534 | ||
40dad765 PB |
9535 | if (vma_is_shmem(vma)) |
9536 | continue; | |
0a96bbe4 BM |
9537 | if (vma->vm_file && |
9538 | !is_file_hugepages(vma->vm_file)) { | |
9539 | ret = -EOPNOTSUPP; | |
9540 | break; | |
9541 | } | |
9542 | } | |
9543 | } else { | |
9544 | ret = pret < 0 ? pret : -EFAULT; | |
9545 | } | |
9546 | mmap_read_unlock(current->mm); | |
9547 | if (ret) { | |
9548 | /* | |
9549 | * if we did partial map, or found file backed vmas, | |
9550 | * release any pages we did get | |
9551 | */ | |
9552 | if (pret > 0) | |
9553 | unpin_user_pages(pages, pret); | |
0a96bbe4 BM |
9554 | goto done; |
9555 | } | |
9556 | ||
9557 | ret = io_buffer_account_pin(ctx, pages, pret, imu, last_hpage); | |
9558 | if (ret) { | |
9559 | unpin_user_pages(pages, pret); | |
0a96bbe4 BM |
9560 | goto done; |
9561 | } | |
9562 | ||
9563 | off = ubuf & ~PAGE_MASK; | |
9564 | size = iov->iov_len; | |
9565 | for (i = 0; i < nr_pages; i++) { | |
9566 | size_t vec_len; | |
9567 | ||
9568 | vec_len = min_t(size_t, size, PAGE_SIZE - off); | |
9569 | imu->bvec[i].bv_page = pages[i]; | |
9570 | imu->bvec[i].bv_len = vec_len; | |
9571 | imu->bvec[i].bv_offset = off; | |
9572 | off = 0; | |
9573 | size -= vec_len; | |
9574 | } | |
9575 | /* store original address for later verification */ | |
9576 | imu->ubuf = ubuf; | |
4751f53d | 9577 | imu->ubuf_end = ubuf + iov->iov_len; |
0a96bbe4 | 9578 | imu->nr_bvecs = nr_pages; |
41edf1a5 | 9579 | *pimu = imu; |
0a96bbe4 BM |
9580 | ret = 0; |
9581 | done: | |
41edf1a5 PB |
9582 | if (ret) |
9583 | kvfree(imu); | |
0a96bbe4 BM |
9584 | kvfree(pages); |
9585 | kvfree(vmas); | |
9586 | return ret; | |
9587 | } | |
9588 | ||
2b358604 | 9589 | static int io_buffers_map_alloc(struct io_ring_ctx *ctx, unsigned int nr_args) |
0a96bbe4 | 9590 | { |
87094465 PB |
9591 | ctx->user_bufs = kcalloc(nr_args, sizeof(*ctx->user_bufs), GFP_KERNEL); |
9592 | return ctx->user_bufs ? 0 : -ENOMEM; | |
2b358604 | 9593 | } |
edafccee | 9594 | |
2b358604 BM |
9595 | static int io_buffer_validate(struct iovec *iov) |
9596 | { | |
50e96989 PB |
9597 | unsigned long tmp, acct_len = iov->iov_len + (PAGE_SIZE - 1); |
9598 | ||
2b358604 BM |
9599 | /* |
9600 | * Don't impose further limits on the size and buffer | |
9601 | * constraints here, we'll -EINVAL later when IO is | |
9602 | * submitted if they are wrong. | |
9603 | */ | |
6224843d PB |
9604 | if (!iov->iov_base) |
9605 | return iov->iov_len ? -EFAULT : 0; | |
9606 | if (!iov->iov_len) | |
2b358604 | 9607 | return -EFAULT; |
edafccee | 9608 | |
2b358604 BM |
9609 | /* arbitrary limit, but we need something */ |
9610 | if (iov->iov_len > SZ_1G) | |
9611 | return -EFAULT; | |
edafccee | 9612 | |
50e96989 PB |
9613 | if (check_add_overflow((unsigned long)iov->iov_base, acct_len, &tmp)) |
9614 | return -EOVERFLOW; | |
9615 | ||
2b358604 BM |
9616 | return 0; |
9617 | } | |
edafccee | 9618 | |
2b358604 | 9619 | static int io_sqe_buffers_register(struct io_ring_ctx *ctx, void __user *arg, |
634d00df | 9620 | unsigned int nr_args, u64 __user *tags) |
2b358604 | 9621 | { |
bd54b6fe BM |
9622 | struct page *last_hpage = NULL; |
9623 | struct io_rsrc_data *data; | |
2b358604 BM |
9624 | int i, ret; |
9625 | struct iovec iov; | |
edafccee | 9626 | |
87094465 PB |
9627 | if (ctx->user_bufs) |
9628 | return -EBUSY; | |
489809e2 | 9629 | if (!nr_args || nr_args > IORING_MAX_REG_BUFFERS) |
87094465 | 9630 | return -EINVAL; |
bd54b6fe | 9631 | ret = io_rsrc_node_switch_start(ctx); |
2b358604 BM |
9632 | if (ret) |
9633 | return ret; | |
d878c816 PB |
9634 | ret = io_rsrc_data_alloc(ctx, io_rsrc_buf_put, tags, nr_args, &data); |
9635 | if (ret) | |
9636 | return ret; | |
bd54b6fe BM |
9637 | ret = io_buffers_map_alloc(ctx, nr_args); |
9638 | if (ret) { | |
bb6659cc | 9639 | io_rsrc_data_free(data); |
bd54b6fe BM |
9640 | return ret; |
9641 | } | |
edafccee | 9642 | |
87094465 | 9643 | for (i = 0; i < nr_args; i++, ctx->nr_user_bufs++) { |
edafccee JA |
9644 | ret = io_copy_iov(ctx, &iov, arg, i); |
9645 | if (ret) | |
0a96bbe4 | 9646 | break; |
2b358604 BM |
9647 | ret = io_buffer_validate(&iov); |
9648 | if (ret) | |
0a96bbe4 | 9649 | break; |
2d091d62 | 9650 | if (!iov.iov_base && *io_get_tag_slot(data, i)) { |
cf3770e7 CIK |
9651 | ret = -EINVAL; |
9652 | break; | |
9653 | } | |
edafccee | 9654 | |
41edf1a5 PB |
9655 | ret = io_sqe_buffer_register(ctx, &iov, &ctx->user_bufs[i], |
9656 | &last_hpage); | |
0a96bbe4 BM |
9657 | if (ret) |
9658 | break; | |
edafccee | 9659 | } |
0a96bbe4 | 9660 | |
bd54b6fe | 9661 | WARN_ON_ONCE(ctx->buf_data); |
0a96bbe4 | 9662 | |
bd54b6fe BM |
9663 | ctx->buf_data = data; |
9664 | if (ret) | |
9665 | __io_sqe_buffers_unregister(ctx); | |
9666 | else | |
9667 | io_rsrc_node_switch(ctx, NULL); | |
edafccee JA |
9668 | return ret; |
9669 | } | |
9670 | ||
634d00df PB |
9671 | static int __io_sqe_buffers_update(struct io_ring_ctx *ctx, |
9672 | struct io_uring_rsrc_update2 *up, | |
9673 | unsigned int nr_args) | |
9674 | { | |
9675 | u64 __user *tags = u64_to_user_ptr(up->tags); | |
9676 | struct iovec iov, __user *iovs = u64_to_user_ptr(up->data); | |
634d00df PB |
9677 | struct page *last_hpage = NULL; |
9678 | bool needs_switch = false; | |
9679 | __u32 done; | |
9680 | int i, err; | |
9681 | ||
9682 | if (!ctx->buf_data) | |
9683 | return -ENXIO; | |
9684 | if (up->offset + nr_args > ctx->nr_user_bufs) | |
9685 | return -EINVAL; | |
9686 | ||
9687 | for (done = 0; done < nr_args; done++) { | |
0b8c0e7c PB |
9688 | struct io_mapped_ubuf *imu; |
9689 | int offset = up->offset + done; | |
634d00df PB |
9690 | u64 tag = 0; |
9691 | ||
9692 | err = io_copy_iov(ctx, &iov, iovs, done); | |
9693 | if (err) | |
9694 | break; | |
9695 | if (tags && copy_from_user(&tag, &tags[done], sizeof(tag))) { | |
9696 | err = -EFAULT; | |
9697 | break; | |
9698 | } | |
0b8c0e7c PB |
9699 | err = io_buffer_validate(&iov); |
9700 | if (err) | |
9701 | break; | |
cf3770e7 CIK |
9702 | if (!iov.iov_base && tag) { |
9703 | err = -EINVAL; | |
9704 | break; | |
9705 | } | |
0b8c0e7c PB |
9706 | err = io_sqe_buffer_register(ctx, &iov, &imu, &last_hpage); |
9707 | if (err) | |
9708 | break; | |
634d00df | 9709 | |
0b8c0e7c | 9710 | i = array_index_nospec(offset, ctx->nr_user_bufs); |
6224843d | 9711 | if (ctx->user_bufs[i] != ctx->dummy_ubuf) { |
4cdd158b | 9712 | err = io_queue_rsrc_removal(ctx->buf_data, i, |
0b8c0e7c PB |
9713 | ctx->rsrc_node, ctx->user_bufs[i]); |
9714 | if (unlikely(err)) { | |
9715 | io_buffer_unmap(ctx, &imu); | |
634d00df | 9716 | break; |
0b8c0e7c | 9717 | } |
634d00df PB |
9718 | ctx->user_bufs[i] = NULL; |
9719 | needs_switch = true; | |
9720 | } | |
9721 | ||
0b8c0e7c | 9722 | ctx->user_bufs[i] = imu; |
2d091d62 | 9723 | *io_get_tag_slot(ctx->buf_data, offset) = tag; |
634d00df PB |
9724 | } |
9725 | ||
9726 | if (needs_switch) | |
9727 | io_rsrc_node_switch(ctx, ctx->buf_data); | |
9728 | return done ? done : err; | |
9729 | } | |
9730 | ||
c75312dd UA |
9731 | static int io_eventfd_register(struct io_ring_ctx *ctx, void __user *arg, |
9732 | unsigned int eventfd_async) | |
9b402849 | 9733 | { |
77bc59b4 | 9734 | struct io_ev_fd *ev_fd; |
9b402849 | 9735 | __s32 __user *fds = arg; |
f0a4e62b | 9736 | int fd; |
9b402849 | 9737 | |
77bc59b4 UA |
9738 | ev_fd = rcu_dereference_protected(ctx->io_ev_fd, |
9739 | lockdep_is_held(&ctx->uring_lock)); | |
9740 | if (ev_fd) | |
9b402849 JA |
9741 | return -EBUSY; |
9742 | ||
9743 | if (copy_from_user(&fd, fds, sizeof(*fds))) | |
9744 | return -EFAULT; | |
9745 | ||
77bc59b4 UA |
9746 | ev_fd = kmalloc(sizeof(*ev_fd), GFP_KERNEL); |
9747 | if (!ev_fd) | |
9748 | return -ENOMEM; | |
fe7e3257 | 9749 | |
77bc59b4 UA |
9750 | ev_fd->cq_ev_fd = eventfd_ctx_fdget(fd); |
9751 | if (IS_ERR(ev_fd->cq_ev_fd)) { | |
f0a4e62b | 9752 | int ret = PTR_ERR(ev_fd->cq_ev_fd); |
77bc59b4 | 9753 | kfree(ev_fd); |
9b402849 JA |
9754 | return ret; |
9755 | } | |
c75312dd | 9756 | ev_fd->eventfd_async = eventfd_async; |
9aa8dfde | 9757 | ctx->has_evfd = true; |
77bc59b4 | 9758 | rcu_assign_pointer(ctx->io_ev_fd, ev_fd); |
f0a4e62b | 9759 | return 0; |
77bc59b4 UA |
9760 | } |
9761 | ||
9762 | static void io_eventfd_put(struct rcu_head *rcu) | |
9763 | { | |
9764 | struct io_ev_fd *ev_fd = container_of(rcu, struct io_ev_fd, rcu); | |
9765 | ||
9766 | eventfd_ctx_put(ev_fd->cq_ev_fd); | |
9767 | kfree(ev_fd); | |
9b402849 JA |
9768 | } |
9769 | ||
9770 | static int io_eventfd_unregister(struct io_ring_ctx *ctx) | |
9771 | { | |
77bc59b4 UA |
9772 | struct io_ev_fd *ev_fd; |
9773 | ||
9774 | ev_fd = rcu_dereference_protected(ctx->io_ev_fd, | |
9775 | lockdep_is_held(&ctx->uring_lock)); | |
9776 | if (ev_fd) { | |
9aa8dfde | 9777 | ctx->has_evfd = false; |
77bc59b4 UA |
9778 | rcu_assign_pointer(ctx->io_ev_fd, NULL); |
9779 | call_rcu(&ev_fd->rcu, io_eventfd_put); | |
9b402849 JA |
9780 | return 0; |
9781 | } | |
9782 | ||
9783 | return -ENXIO; | |
9784 | } | |
9785 | ||
5a2e745d JA |
9786 | static void io_destroy_buffers(struct io_ring_ctx *ctx) |
9787 | { | |
dbc7d452 JA |
9788 | int i; |
9789 | ||
9790 | for (i = 0; i < (1U << IO_BUFFERS_HASH_BITS); i++) { | |
9791 | struct list_head *list = &ctx->io_buffers[i]; | |
9e15c3a0 | 9792 | |
dbc7d452 JA |
9793 | while (!list_empty(list)) { |
9794 | struct io_buffer_list *bl; | |
9795 | ||
9796 | bl = list_first_entry(list, struct io_buffer_list, list); | |
9797 | __io_remove_buffers(ctx, bl, -1U); | |
9798 | list_del(&bl->list); | |
9799 | kfree(bl); | |
9800 | } | |
9801 | } | |
cc3cec83 JA |
9802 | |
9803 | while (!list_empty(&ctx->io_buffers_pages)) { | |
9804 | struct page *page; | |
9805 | ||
9806 | page = list_first_entry(&ctx->io_buffers_pages, struct page, lru); | |
9807 | list_del_init(&page->lru); | |
9808 | __free_page(page); | |
9809 | } | |
5a2e745d JA |
9810 | } |
9811 | ||
4010fec4 | 9812 | static void io_req_caches_free(struct io_ring_ctx *ctx) |
2b188cc1 | 9813 | { |
cd0ca2e0 | 9814 | struct io_submit_state *state = &ctx->submit_state; |
37f0e767 | 9815 | int nr = 0; |
bf019da7 | 9816 | |
9a4fdbd8 | 9817 | mutex_lock(&ctx->uring_lock); |
cd0ca2e0 | 9818 | io_flush_cached_locked_reqs(ctx, state); |
9a4fdbd8 | 9819 | |
c2b6c6bc PB |
9820 | while (state->free_list.next) { |
9821 | struct io_wq_work_node *node; | |
9822 | struct io_kiocb *req; | |
9a4fdbd8 | 9823 | |
c2b6c6bc PB |
9824 | node = wq_stack_extract(&state->free_list); |
9825 | req = container_of(node, struct io_kiocb, comp_list); | |
9826 | kmem_cache_free(req_cachep, req); | |
37f0e767 | 9827 | nr++; |
c2b6c6bc | 9828 | } |
37f0e767 PB |
9829 | if (nr) |
9830 | percpu_ref_put_many(&ctx->refs, nr); | |
9a4fdbd8 JA |
9831 | mutex_unlock(&ctx->uring_lock); |
9832 | } | |
9833 | ||
43597aac | 9834 | static void io_wait_rsrc_data(struct io_rsrc_data *data) |
2b188cc1 | 9835 | { |
43597aac | 9836 | if (data && !atomic_dec_and_test(&data->refs)) |
bd54b6fe | 9837 | wait_for_completion(&data->done); |
bd54b6fe | 9838 | } |
04fc6c80 | 9839 | |
4d9237e3 JA |
9840 | static void io_flush_apoll_cache(struct io_ring_ctx *ctx) |
9841 | { | |
9842 | struct async_poll *apoll; | |
9843 | ||
9844 | while (!list_empty(&ctx->apoll_cache)) { | |
9845 | apoll = list_first_entry(&ctx->apoll_cache, struct async_poll, | |
9846 | poll.wait.entry); | |
9847 | list_del(&apoll->poll.wait.entry); | |
9848 | kfree(apoll); | |
9849 | } | |
9850 | } | |
9851 | ||
c072481d | 9852 | static __cold void io_ring_ctx_free(struct io_ring_ctx *ctx) |
2b188cc1 | 9853 | { |
37d1e2e3 | 9854 | io_sq_thread_finish(ctx); |
2aede0e4 | 9855 | |
37d1e2e3 | 9856 | if (ctx->mm_account) { |
2aede0e4 JA |
9857 | mmdrop(ctx->mm_account); |
9858 | ctx->mm_account = NULL; | |
30975825 | 9859 | } |
def596e9 | 9860 | |
ab409402 | 9861 | io_rsrc_refs_drop(ctx); |
43597aac PB |
9862 | /* __io_rsrc_put_work() may need uring_lock to progress, wait w/o it */ |
9863 | io_wait_rsrc_data(ctx->buf_data); | |
9864 | io_wait_rsrc_data(ctx->file_data); | |
9865 | ||
8bad28d8 | 9866 | mutex_lock(&ctx->uring_lock); |
43597aac | 9867 | if (ctx->buf_data) |
bd54b6fe | 9868 | __io_sqe_buffers_unregister(ctx); |
43597aac | 9869 | if (ctx->file_data) |
08480400 | 9870 | __io_sqe_files_unregister(ctx); |
c4ea060e PB |
9871 | if (ctx->rings) |
9872 | __io_cqring_overflow_flush(ctx, true); | |
9b402849 | 9873 | io_eventfd_unregister(ctx); |
4d9237e3 | 9874 | io_flush_apoll_cache(ctx); |
77bc59b4 | 9875 | mutex_unlock(&ctx->uring_lock); |
5a2e745d | 9876 | io_destroy_buffers(ctx); |
07db298a PB |
9877 | if (ctx->sq_creds) |
9878 | put_cred(ctx->sq_creds); | |
def596e9 | 9879 | |
a7f0ed5a PB |
9880 | /* there are no registered resources left, nobody uses it */ |
9881 | if (ctx->rsrc_node) | |
9882 | io_rsrc_node_destroy(ctx->rsrc_node); | |
8dd03afe | 9883 | if (ctx->rsrc_backup_node) |
b895c9a6 | 9884 | io_rsrc_node_destroy(ctx->rsrc_backup_node); |
a7f0ed5a | 9885 | flush_delayed_work(&ctx->rsrc_put_work); |
756ab7c0 | 9886 | flush_delayed_work(&ctx->fallback_work); |
a7f0ed5a PB |
9887 | |
9888 | WARN_ON_ONCE(!list_empty(&ctx->rsrc_ref_list)); | |
9889 | WARN_ON_ONCE(!llist_empty(&ctx->rsrc_put_llist)); | |
def596e9 | 9890 | |
2b188cc1 | 9891 | #if defined(CONFIG_UNIX) |
355e8d26 EB |
9892 | if (ctx->ring_sock) { |
9893 | ctx->ring_sock->file = NULL; /* so that iput() is called */ | |
2b188cc1 | 9894 | sock_release(ctx->ring_sock); |
355e8d26 | 9895 | } |
2b188cc1 | 9896 | #endif |
ef9dd637 | 9897 | WARN_ON_ONCE(!list_empty(&ctx->ltimeout_list)); |
2b188cc1 | 9898 | |
75b28aff | 9899 | io_mem_free(ctx->rings); |
2b188cc1 | 9900 | io_mem_free(ctx->sq_sqes); |
2b188cc1 JA |
9901 | |
9902 | percpu_ref_exit(&ctx->refs); | |
2b188cc1 | 9903 | free_uid(ctx->user); |
4010fec4 | 9904 | io_req_caches_free(ctx); |
e941894e JA |
9905 | if (ctx->hash_map) |
9906 | io_wq_put_hash(ctx->hash_map); | |
78076bb6 | 9907 | kfree(ctx->cancel_hash); |
6224843d | 9908 | kfree(ctx->dummy_ubuf); |
dbc7d452 | 9909 | kfree(ctx->io_buffers); |
2b188cc1 JA |
9910 | kfree(ctx); |
9911 | } | |
9912 | ||
9913 | static __poll_t io_uring_poll(struct file *file, poll_table *wait) | |
9914 | { | |
9915 | struct io_ring_ctx *ctx = file->private_data; | |
9916 | __poll_t mask = 0; | |
9917 | ||
d60aa65b | 9918 | poll_wait(file, &ctx->cq_wait, wait); |
4f7067c3 SB |
9919 | /* |
9920 | * synchronizes with barrier from wq_has_sleeper call in | |
9921 | * io_commit_cqring | |
9922 | */ | |
2b188cc1 | 9923 | smp_rmb(); |
90554200 | 9924 | if (!io_sqring_full(ctx)) |
2b188cc1 | 9925 | mask |= EPOLLOUT | EPOLLWRNORM; |
ed670c3f HX |
9926 | |
9927 | /* | |
9928 | * Don't flush cqring overflow list here, just do a simple check. | |
9929 | * Otherwise there could possible be ABBA deadlock: | |
9930 | * CPU0 CPU1 | |
9931 | * ---- ---- | |
9932 | * lock(&ctx->uring_lock); | |
9933 | * lock(&ep->mtx); | |
9934 | * lock(&ctx->uring_lock); | |
9935 | * lock(&ep->mtx); | |
9936 | * | |
9937 | * Users may get EPOLLIN meanwhile seeing nothing in cqring, this | |
9938 | * pushs them to do the flush. | |
9939 | */ | |
5ed7a37d | 9940 | if (io_cqring_events(ctx) || test_bit(0, &ctx->check_cq_overflow)) |
2b188cc1 JA |
9941 | mask |= EPOLLIN | EPOLLRDNORM; |
9942 | ||
9943 | return mask; | |
9944 | } | |
9945 | ||
0bead8cd | 9946 | static int io_unregister_personality(struct io_ring_ctx *ctx, unsigned id) |
071698e1 | 9947 | { |
4379bf8b | 9948 | const struct cred *creds; |
071698e1 | 9949 | |
61cf9370 | 9950 | creds = xa_erase(&ctx->personalities, id); |
4379bf8b JA |
9951 | if (creds) { |
9952 | put_cred(creds); | |
0bead8cd | 9953 | return 0; |
1e6fa521 | 9954 | } |
0bead8cd YD |
9955 | |
9956 | return -EINVAL; | |
9957 | } | |
9958 | ||
d56d938b PB |
9959 | struct io_tctx_exit { |
9960 | struct callback_head task_work; | |
9961 | struct completion completion; | |
baf186c4 | 9962 | struct io_ring_ctx *ctx; |
d56d938b PB |
9963 | }; |
9964 | ||
c072481d | 9965 | static __cold void io_tctx_exit_cb(struct callback_head *cb) |
d56d938b PB |
9966 | { |
9967 | struct io_uring_task *tctx = current->io_uring; | |
9968 | struct io_tctx_exit *work; | |
9969 | ||
9970 | work = container_of(cb, struct io_tctx_exit, task_work); | |
9971 | /* | |
9972 | * When @in_idle, we're in cancellation and it's racy to remove the | |
9973 | * node. It'll be removed by the end of cancellation, just ignore it. | |
9974 | */ | |
9975 | if (!atomic_read(&tctx->in_idle)) | |
eef51daa | 9976 | io_uring_del_tctx_node((unsigned long)work->ctx); |
d56d938b PB |
9977 | complete(&work->completion); |
9978 | } | |
9979 | ||
c072481d | 9980 | static __cold bool io_cancel_ctx_cb(struct io_wq_work *work, void *data) |
28090c13 PB |
9981 | { |
9982 | struct io_kiocb *req = container_of(work, struct io_kiocb, work); | |
9983 | ||
9984 | return req->ctx == data; | |
9985 | } | |
9986 | ||
c072481d | 9987 | static __cold void io_ring_exit_work(struct work_struct *work) |
85faa7b8 | 9988 | { |
d56d938b | 9989 | struct io_ring_ctx *ctx = container_of(work, struct io_ring_ctx, exit_work); |
b5bb3a24 | 9990 | unsigned long timeout = jiffies + HZ * 60 * 5; |
58d3be2c | 9991 | unsigned long interval = HZ / 20; |
d56d938b PB |
9992 | struct io_tctx_exit exit; |
9993 | struct io_tctx_node *node; | |
9994 | int ret; | |
85faa7b8 | 9995 | |
56952e91 JA |
9996 | /* |
9997 | * If we're doing polled IO and end up having requests being | |
9998 | * submitted async (out-of-line), then completions can come in while | |
9999 | * we're waiting for refs to drop. We need to reap these manually, | |
10000 | * as nobody else will be looking for them. | |
10001 | */ | |
b2edc0a7 | 10002 | do { |
3dd0c97a | 10003 | io_uring_try_cancel_requests(ctx, NULL, true); |
28090c13 PB |
10004 | if (ctx->sq_data) { |
10005 | struct io_sq_data *sqd = ctx->sq_data; | |
10006 | struct task_struct *tsk; | |
10007 | ||
10008 | io_sq_thread_park(sqd); | |
10009 | tsk = sqd->thread; | |
10010 | if (tsk && tsk->io_uring && tsk->io_uring->io_wq) | |
10011 | io_wq_cancel_cb(tsk->io_uring->io_wq, | |
10012 | io_cancel_ctx_cb, ctx, true); | |
10013 | io_sq_thread_unpark(sqd); | |
10014 | } | |
b5bb3a24 | 10015 | |
37f0e767 PB |
10016 | io_req_caches_free(ctx); |
10017 | ||
58d3be2c PB |
10018 | if (WARN_ON_ONCE(time_after(jiffies, timeout))) { |
10019 | /* there is little hope left, don't run it too often */ | |
10020 | interval = HZ * 60; | |
10021 | } | |
10022 | } while (!wait_for_completion_timeout(&ctx->ref_comp, interval)); | |
d56d938b | 10023 | |
7f00651a PB |
10024 | init_completion(&exit.completion); |
10025 | init_task_work(&exit.task_work, io_tctx_exit_cb); | |
10026 | exit.ctx = ctx; | |
89b5066e PB |
10027 | /* |
10028 | * Some may use context even when all refs and requests have been put, | |
10029 | * and they are free to do so while still holding uring_lock or | |
5b0a6acc | 10030 | * completion_lock, see io_req_task_submit(). Apart from other work, |
89b5066e PB |
10031 | * this lock/unlock section also waits them to finish. |
10032 | */ | |
d56d938b PB |
10033 | mutex_lock(&ctx->uring_lock); |
10034 | while (!list_empty(&ctx->tctx_list)) { | |
b5bb3a24 PB |
10035 | WARN_ON_ONCE(time_after(jiffies, timeout)); |
10036 | ||
d56d938b PB |
10037 | node = list_first_entry(&ctx->tctx_list, struct io_tctx_node, |
10038 | ctx_node); | |
7f00651a PB |
10039 | /* don't spin on a single task if cancellation failed */ |
10040 | list_rotate_left(&ctx->tctx_list); | |
d56d938b PB |
10041 | ret = task_work_add(node->task, &exit.task_work, TWA_SIGNAL); |
10042 | if (WARN_ON_ONCE(ret)) | |
10043 | continue; | |
d56d938b PB |
10044 | |
10045 | mutex_unlock(&ctx->uring_lock); | |
10046 | wait_for_completion(&exit.completion); | |
d56d938b PB |
10047 | mutex_lock(&ctx->uring_lock); |
10048 | } | |
10049 | mutex_unlock(&ctx->uring_lock); | |
79ebeaee JA |
10050 | spin_lock(&ctx->completion_lock); |
10051 | spin_unlock(&ctx->completion_lock); | |
d56d938b | 10052 | |
85faa7b8 JA |
10053 | io_ring_ctx_free(ctx); |
10054 | } | |
10055 | ||
80c4cbdb | 10056 | /* Returns true if we found and killed one or more timeouts */ |
c072481d PB |
10057 | static __cold bool io_kill_timeouts(struct io_ring_ctx *ctx, |
10058 | struct task_struct *tsk, bool cancel_all) | |
80c4cbdb PB |
10059 | { |
10060 | struct io_kiocb *req, *tmp; | |
10061 | int canceled = 0; | |
10062 | ||
79ebeaee JA |
10063 | spin_lock(&ctx->completion_lock); |
10064 | spin_lock_irq(&ctx->timeout_lock); | |
80c4cbdb | 10065 | list_for_each_entry_safe(req, tmp, &ctx->timeout_list, timeout.list) { |
3dd0c97a | 10066 | if (io_match_task(req, tsk, cancel_all)) { |
80c4cbdb PB |
10067 | io_kill_timeout(req, -ECANCELED); |
10068 | canceled++; | |
10069 | } | |
10070 | } | |
79ebeaee | 10071 | spin_unlock_irq(&ctx->timeout_lock); |
60053be8 | 10072 | io_commit_cqring(ctx); |
79ebeaee | 10073 | spin_unlock(&ctx->completion_lock); |
80c4cbdb PB |
10074 | if (canceled != 0) |
10075 | io_cqring_ev_posted(ctx); | |
10076 | return canceled != 0; | |
10077 | } | |
10078 | ||
c072481d | 10079 | static __cold void io_ring_ctx_wait_and_kill(struct io_ring_ctx *ctx) |
2b188cc1 | 10080 | { |
61cf9370 MWO |
10081 | unsigned long index; |
10082 | struct creds *creds; | |
10083 | ||
2b188cc1 JA |
10084 | mutex_lock(&ctx->uring_lock); |
10085 | percpu_ref_kill(&ctx->refs); | |
634578f8 | 10086 | if (ctx->rings) |
6c2450ae | 10087 | __io_cqring_overflow_flush(ctx, true); |
61cf9370 MWO |
10088 | xa_for_each(&ctx->personalities, index, creds) |
10089 | io_unregister_personality(ctx, index); | |
2b188cc1 JA |
10090 | mutex_unlock(&ctx->uring_lock); |
10091 | ||
60053be8 PB |
10092 | /* failed during ring init, it couldn't have issued any requests */ |
10093 | if (ctx->rings) { | |
10094 | io_kill_timeouts(ctx, NULL, true); | |
10095 | io_poll_remove_all(ctx, NULL, true); | |
10096 | /* if we failed setting up the ctx, we might not have any rings */ | |
10097 | io_iopoll_try_reap_events(ctx); | |
10098 | } | |
309fc03a | 10099 | |
85faa7b8 | 10100 | INIT_WORK(&ctx->exit_work, io_ring_exit_work); |
fc666777 JA |
10101 | /* |
10102 | * Use system_unbound_wq to avoid spawning tons of event kworkers | |
10103 | * if we're exiting a ton of rings at the same time. It just adds | |
10104 | * noise and overhead, there's no discernable change in runtime | |
10105 | * over using system_wq. | |
10106 | */ | |
10107 | queue_work(system_unbound_wq, &ctx->exit_work); | |
2b188cc1 JA |
10108 | } |
10109 | ||
10110 | static int io_uring_release(struct inode *inode, struct file *file) | |
10111 | { | |
10112 | struct io_ring_ctx *ctx = file->private_data; | |
10113 | ||
10114 | file->private_data = NULL; | |
10115 | io_ring_ctx_wait_and_kill(ctx); | |
10116 | return 0; | |
10117 | } | |
10118 | ||
f6edbabb PB |
10119 | struct io_task_cancel { |
10120 | struct task_struct *task; | |
3dd0c97a | 10121 | bool all; |
f6edbabb | 10122 | }; |
f254ac04 | 10123 | |
f6edbabb | 10124 | static bool io_cancel_task_cb(struct io_wq_work *work, void *data) |
b711d4ea | 10125 | { |
9a472ef7 | 10126 | struct io_kiocb *req = container_of(work, struct io_kiocb, work); |
f6edbabb | 10127 | struct io_task_cancel *cancel = data; |
9a472ef7 | 10128 | |
6af3f48b | 10129 | return io_match_task_safe(req, cancel->task, cancel->all); |
b711d4ea JA |
10130 | } |
10131 | ||
c072481d PB |
10132 | static __cold bool io_cancel_defer_files(struct io_ring_ctx *ctx, |
10133 | struct task_struct *task, | |
10134 | bool cancel_all) | |
b7ddce3c | 10135 | { |
e1915f76 | 10136 | struct io_defer_entry *de; |
b7ddce3c PB |
10137 | LIST_HEAD(list); |
10138 | ||
79ebeaee | 10139 | spin_lock(&ctx->completion_lock); |
b7ddce3c | 10140 | list_for_each_entry_reverse(de, &ctx->defer_list, list) { |
6af3f48b | 10141 | if (io_match_task_safe(de->req, task, cancel_all)) { |
b7ddce3c PB |
10142 | list_cut_position(&list, &ctx->defer_list, &de->list); |
10143 | break; | |
10144 | } | |
10145 | } | |
79ebeaee | 10146 | spin_unlock(&ctx->completion_lock); |
e1915f76 PB |
10147 | if (list_empty(&list)) |
10148 | return false; | |
b7ddce3c PB |
10149 | |
10150 | while (!list_empty(&list)) { | |
10151 | de = list_first_entry(&list, struct io_defer_entry, list); | |
10152 | list_del_init(&de->list); | |
f41db273 | 10153 | io_req_complete_failed(de->req, -ECANCELED); |
b7ddce3c PB |
10154 | kfree(de); |
10155 | } | |
e1915f76 | 10156 | return true; |
b7ddce3c PB |
10157 | } |
10158 | ||
c072481d | 10159 | static __cold bool io_uring_try_cancel_iowq(struct io_ring_ctx *ctx) |
1b00764f PB |
10160 | { |
10161 | struct io_tctx_node *node; | |
10162 | enum io_wq_cancel cret; | |
10163 | bool ret = false; | |
10164 | ||
10165 | mutex_lock(&ctx->uring_lock); | |
10166 | list_for_each_entry(node, &ctx->tctx_list, ctx_node) { | |
10167 | struct io_uring_task *tctx = node->task->io_uring; | |
10168 | ||
10169 | /* | |
10170 | * io_wq will stay alive while we hold uring_lock, because it's | |
10171 | * killed after ctx nodes, which requires to take the lock. | |
10172 | */ | |
10173 | if (!tctx || !tctx->io_wq) | |
10174 | continue; | |
10175 | cret = io_wq_cancel_cb(tctx->io_wq, io_cancel_ctx_cb, ctx, true); | |
10176 | ret |= (cret != IO_WQ_CANCEL_NOTFOUND); | |
10177 | } | |
10178 | mutex_unlock(&ctx->uring_lock); | |
10179 | ||
10180 | return ret; | |
10181 | } | |
10182 | ||
c072481d PB |
10183 | static __cold void io_uring_try_cancel_requests(struct io_ring_ctx *ctx, |
10184 | struct task_struct *task, | |
10185 | bool cancel_all) | |
9936c7c2 | 10186 | { |
3dd0c97a | 10187 | struct io_task_cancel cancel = { .task = task, .all = cancel_all, }; |
1b00764f | 10188 | struct io_uring_task *tctx = task ? task->io_uring : NULL; |
9936c7c2 | 10189 | |
60053be8 PB |
10190 | /* failed during ring init, it couldn't have issued any requests */ |
10191 | if (!ctx->rings) | |
10192 | return; | |
10193 | ||
9936c7c2 PB |
10194 | while (1) { |
10195 | enum io_wq_cancel cret; | |
10196 | bool ret = false; | |
10197 | ||
1b00764f PB |
10198 | if (!task) { |
10199 | ret |= io_uring_try_cancel_iowq(ctx); | |
10200 | } else if (tctx && tctx->io_wq) { | |
10201 | /* | |
10202 | * Cancels requests of all rings, not only @ctx, but | |
10203 | * it's fine as the task is in exit/exec. | |
10204 | */ | |
5aa75ed5 | 10205 | cret = io_wq_cancel_cb(tctx->io_wq, io_cancel_task_cb, |
9936c7c2 PB |
10206 | &cancel, true); |
10207 | ret |= (cret != IO_WQ_CANCEL_NOTFOUND); | |
10208 | } | |
10209 | ||
10210 | /* SQPOLL thread does its own polling */ | |
3dd0c97a | 10211 | if ((!(ctx->flags & IORING_SETUP_SQPOLL) && cancel_all) || |
d052d1d6 | 10212 | (ctx->sq_data && ctx->sq_data->thread == current)) { |
5eef4e87 | 10213 | while (!wq_list_empty(&ctx->iopoll_list)) { |
9936c7c2 PB |
10214 | io_iopoll_try_reap_events(ctx); |
10215 | ret = true; | |
10216 | } | |
10217 | } | |
10218 | ||
3dd0c97a PB |
10219 | ret |= io_cancel_defer_files(ctx, task, cancel_all); |
10220 | ret |= io_poll_remove_all(ctx, task, cancel_all); | |
10221 | ret |= io_kill_timeouts(ctx, task, cancel_all); | |
e5dc480d PB |
10222 | if (task) |
10223 | ret |= io_run_task_work(); | |
9936c7c2 PB |
10224 | if (!ret) |
10225 | break; | |
10226 | cond_resched(); | |
10227 | } | |
10228 | } | |
10229 | ||
eef51daa | 10230 | static int __io_uring_add_tctx_node(struct io_ring_ctx *ctx) |
0f212204 | 10231 | { |
236434c3 | 10232 | struct io_uring_task *tctx = current->io_uring; |
13bf43f5 | 10233 | struct io_tctx_node *node; |
a528b04e | 10234 | int ret; |
236434c3 MWO |
10235 | |
10236 | if (unlikely(!tctx)) { | |
5aa75ed5 | 10237 | ret = io_uring_alloc_task_context(current, ctx); |
0f212204 JA |
10238 | if (unlikely(ret)) |
10239 | return ret; | |
e139a1ec | 10240 | |
236434c3 | 10241 | tctx = current->io_uring; |
e139a1ec PB |
10242 | if (ctx->iowq_limits_set) { |
10243 | unsigned int limits[2] = { ctx->iowq_limits[0], | |
10244 | ctx->iowq_limits[1], }; | |
10245 | ||
10246 | ret = io_wq_max_workers(tctx->io_wq, limits); | |
10247 | if (ret) | |
10248 | return ret; | |
10249 | } | |
0f212204 | 10250 | } |
cf27f3b1 PB |
10251 | if (!xa_load(&tctx->xa, (unsigned long)ctx)) { |
10252 | node = kmalloc(sizeof(*node), GFP_KERNEL); | |
10253 | if (!node) | |
10254 | return -ENOMEM; | |
10255 | node->ctx = ctx; | |
10256 | node->task = current; | |
13bf43f5 | 10257 | |
cf27f3b1 PB |
10258 | ret = xa_err(xa_store(&tctx->xa, (unsigned long)ctx, |
10259 | node, GFP_KERNEL)); | |
10260 | if (ret) { | |
10261 | kfree(node); | |
10262 | return ret; | |
0f212204 | 10263 | } |
cf27f3b1 PB |
10264 | |
10265 | mutex_lock(&ctx->uring_lock); | |
10266 | list_add(&node->ctx_node, &ctx->tctx_list); | |
10267 | mutex_unlock(&ctx->uring_lock); | |
0f212204 | 10268 | } |
cf27f3b1 | 10269 | tctx->last = ctx; |
0f212204 JA |
10270 | return 0; |
10271 | } | |
10272 | ||
cf27f3b1 PB |
10273 | /* |
10274 | * Note that this task has used io_uring. We use it for cancelation purposes. | |
10275 | */ | |
eef51daa | 10276 | static inline int io_uring_add_tctx_node(struct io_ring_ctx *ctx) |
cf27f3b1 PB |
10277 | { |
10278 | struct io_uring_task *tctx = current->io_uring; | |
10279 | ||
10280 | if (likely(tctx && tctx->last == ctx)) | |
10281 | return 0; | |
eef51daa | 10282 | return __io_uring_add_tctx_node(ctx); |
cf27f3b1 PB |
10283 | } |
10284 | ||
0f212204 JA |
10285 | /* |
10286 | * Remove this io_uring_file -> task mapping. | |
10287 | */ | |
c072481d | 10288 | static __cold void io_uring_del_tctx_node(unsigned long index) |
0f212204 JA |
10289 | { |
10290 | struct io_uring_task *tctx = current->io_uring; | |
13bf43f5 | 10291 | struct io_tctx_node *node; |
2941267b | 10292 | |
eebd2e37 PB |
10293 | if (!tctx) |
10294 | return; | |
13bf43f5 PB |
10295 | node = xa_erase(&tctx->xa, index); |
10296 | if (!node) | |
2941267b | 10297 | return; |
0f212204 | 10298 | |
13bf43f5 PB |
10299 | WARN_ON_ONCE(current != node->task); |
10300 | WARN_ON_ONCE(list_empty(&node->ctx_node)); | |
10301 | ||
10302 | mutex_lock(&node->ctx->uring_lock); | |
10303 | list_del(&node->ctx_node); | |
10304 | mutex_unlock(&node->ctx->uring_lock); | |
10305 | ||
baf186c4 | 10306 | if (tctx->last == node->ctx) |
0f212204 | 10307 | tctx->last = NULL; |
13bf43f5 | 10308 | kfree(node); |
0f212204 JA |
10309 | } |
10310 | ||
c072481d | 10311 | static __cold void io_uring_clean_tctx(struct io_uring_task *tctx) |
de7f1d9e | 10312 | { |
ba5ef6dc | 10313 | struct io_wq *wq = tctx->io_wq; |
13bf43f5 | 10314 | struct io_tctx_node *node; |
de7f1d9e PB |
10315 | unsigned long index; |
10316 | ||
8bab4c09 | 10317 | xa_for_each(&tctx->xa, index, node) { |
eef51daa | 10318 | io_uring_del_tctx_node(index); |
8bab4c09 JA |
10319 | cond_resched(); |
10320 | } | |
b16ef427 ME |
10321 | if (wq) { |
10322 | /* | |
f6f9b278 | 10323 | * Must be after io_uring_del_tctx_node() (removes nodes under |
b16ef427 ME |
10324 | * uring_lock) to avoid race with io_uring_try_cancel_iowq(). |
10325 | */ | |
ba5ef6dc | 10326 | io_wq_put_and_exit(wq); |
dadebc35 | 10327 | tctx->io_wq = NULL; |
b16ef427 | 10328 | } |
de7f1d9e PB |
10329 | } |
10330 | ||
3f48cf18 | 10331 | static s64 tctx_inflight(struct io_uring_task *tctx, bool tracked) |
521d6a73 | 10332 | { |
3f48cf18 | 10333 | if (tracked) |
d5361233 | 10334 | return 0; |
521d6a73 PB |
10335 | return percpu_counter_sum(&tctx->inflight); |
10336 | } | |
10337 | ||
78cc687b PB |
10338 | /* |
10339 | * Find any io_uring ctx that this task has registered or done IO on, and cancel | |
78a78060 | 10340 | * requests. @sqd should be not-null IFF it's an SQPOLL thread cancellation. |
78cc687b | 10341 | */ |
c072481d PB |
10342 | static __cold void io_uring_cancel_generic(bool cancel_all, |
10343 | struct io_sq_data *sqd) | |
0e9ddb39 | 10344 | { |
521d6a73 | 10345 | struct io_uring_task *tctx = current->io_uring; |
734551df | 10346 | struct io_ring_ctx *ctx; |
0e9ddb39 PB |
10347 | s64 inflight; |
10348 | DEFINE_WAIT(wait); | |
fdaf083c | 10349 | |
78cc687b PB |
10350 | WARN_ON_ONCE(sqd && sqd->thread != current); |
10351 | ||
6d042ffb PO |
10352 | if (!current->io_uring) |
10353 | return; | |
17a91051 PB |
10354 | if (tctx->io_wq) |
10355 | io_wq_exit_start(tctx->io_wq); | |
10356 | ||
0e9ddb39 PB |
10357 | atomic_inc(&tctx->in_idle); |
10358 | do { | |
e9dbe221 | 10359 | io_uring_drop_tctx_refs(current); |
0e9ddb39 | 10360 | /* read completions before cancelations */ |
78cc687b | 10361 | inflight = tctx_inflight(tctx, !cancel_all); |
0e9ddb39 PB |
10362 | if (!inflight) |
10363 | break; | |
fdaf083c | 10364 | |
78cc687b PB |
10365 | if (!sqd) { |
10366 | struct io_tctx_node *node; | |
10367 | unsigned long index; | |
0f212204 | 10368 | |
78cc687b PB |
10369 | xa_for_each(&tctx->xa, index, node) { |
10370 | /* sqpoll task will cancel all its requests */ | |
10371 | if (node->ctx->sq_data) | |
10372 | continue; | |
10373 | io_uring_try_cancel_requests(node->ctx, current, | |
10374 | cancel_all); | |
10375 | } | |
10376 | } else { | |
10377 | list_for_each_entry(ctx, &sqd->ctx_list, sqd_list) | |
10378 | io_uring_try_cancel_requests(ctx, current, | |
10379 | cancel_all); | |
10380 | } | |
17a91051 | 10381 | |
78a78060 JA |
10382 | prepare_to_wait(&tctx->wait, &wait, TASK_INTERRUPTIBLE); |
10383 | io_run_task_work(); | |
e9dbe221 | 10384 | io_uring_drop_tctx_refs(current); |
78a78060 | 10385 | |
0f212204 | 10386 | /* |
a1bb3cd5 PB |
10387 | * If we've seen completions, retry without waiting. This |
10388 | * avoids a race where a completion comes in before we did | |
10389 | * prepare_to_wait(). | |
0f212204 | 10390 | */ |
3dd0c97a | 10391 | if (inflight == tctx_inflight(tctx, !cancel_all)) |
a1bb3cd5 | 10392 | schedule(); |
f57555ed | 10393 | finish_wait(&tctx->wait, &wait); |
d8a6df10 | 10394 | } while (1); |
de7f1d9e | 10395 | |
8452d4a6 | 10396 | io_uring_clean_tctx(tctx); |
3dd0c97a | 10397 | if (cancel_all) { |
3cc7fdb9 PB |
10398 | /* |
10399 | * We shouldn't run task_works after cancel, so just leave | |
10400 | * ->in_idle set for normal exit. | |
10401 | */ | |
10402 | atomic_dec(&tctx->in_idle); | |
3f48cf18 PB |
10403 | /* for exec all current's requests should be gone, kill tctx */ |
10404 | __io_uring_free(current); | |
10405 | } | |
44e728b8 PB |
10406 | } |
10407 | ||
f552a27a | 10408 | void __io_uring_cancel(bool cancel_all) |
78cc687b | 10409 | { |
f552a27a | 10410 | io_uring_cancel_generic(cancel_all, NULL); |
78cc687b PB |
10411 | } |
10412 | ||
e7a6c00d JA |
10413 | void io_uring_unreg_ringfd(void) |
10414 | { | |
10415 | struct io_uring_task *tctx = current->io_uring; | |
10416 | int i; | |
10417 | ||
10418 | for (i = 0; i < IO_RINGFD_REG_MAX; i++) { | |
10419 | if (tctx->registered_rings[i]) { | |
10420 | fput(tctx->registered_rings[i]); | |
10421 | tctx->registered_rings[i] = NULL; | |
10422 | } | |
10423 | } | |
10424 | } | |
10425 | ||
10426 | static int io_ring_add_registered_fd(struct io_uring_task *tctx, int fd, | |
10427 | int start, int end) | |
10428 | { | |
10429 | struct file *file; | |
10430 | int offset; | |
10431 | ||
10432 | for (offset = start; offset < end; offset++) { | |
10433 | offset = array_index_nospec(offset, IO_RINGFD_REG_MAX); | |
10434 | if (tctx->registered_rings[offset]) | |
10435 | continue; | |
10436 | ||
10437 | file = fget(fd); | |
10438 | if (!file) { | |
10439 | return -EBADF; | |
10440 | } else if (file->f_op != &io_uring_fops) { | |
10441 | fput(file); | |
10442 | return -EOPNOTSUPP; | |
10443 | } | |
10444 | tctx->registered_rings[offset] = file; | |
10445 | return offset; | |
10446 | } | |
10447 | ||
10448 | return -EBUSY; | |
10449 | } | |
10450 | ||
10451 | /* | |
10452 | * Register a ring fd to avoid fdget/fdput for each io_uring_enter() | |
10453 | * invocation. User passes in an array of struct io_uring_rsrc_update | |
10454 | * with ->data set to the ring_fd, and ->offset given for the desired | |
10455 | * index. If no index is desired, application may set ->offset == -1U | |
10456 | * and we'll find an available index. Returns number of entries | |
10457 | * successfully processed, or < 0 on error if none were processed. | |
10458 | */ | |
10459 | static int io_ringfd_register(struct io_ring_ctx *ctx, void __user *__arg, | |
10460 | unsigned nr_args) | |
10461 | { | |
10462 | struct io_uring_rsrc_update __user *arg = __arg; | |
10463 | struct io_uring_rsrc_update reg; | |
10464 | struct io_uring_task *tctx; | |
10465 | int ret, i; | |
10466 | ||
10467 | if (!nr_args || nr_args > IO_RINGFD_REG_MAX) | |
10468 | return -EINVAL; | |
10469 | ||
10470 | mutex_unlock(&ctx->uring_lock); | |
10471 | ret = io_uring_add_tctx_node(ctx); | |
10472 | mutex_lock(&ctx->uring_lock); | |
10473 | if (ret) | |
10474 | return ret; | |
10475 | ||
10476 | tctx = current->io_uring; | |
10477 | for (i = 0; i < nr_args; i++) { | |
10478 | int start, end; | |
10479 | ||
10480 | if (copy_from_user(®, &arg[i], sizeof(reg))) { | |
10481 | ret = -EFAULT; | |
10482 | break; | |
10483 | } | |
10484 | ||
6fb53cf8 DY |
10485 | if (reg.resv) { |
10486 | ret = -EINVAL; | |
10487 | break; | |
10488 | } | |
10489 | ||
e7a6c00d JA |
10490 | if (reg.offset == -1U) { |
10491 | start = 0; | |
10492 | end = IO_RINGFD_REG_MAX; | |
10493 | } else { | |
10494 | if (reg.offset >= IO_RINGFD_REG_MAX) { | |
10495 | ret = -EINVAL; | |
10496 | break; | |
10497 | } | |
10498 | start = reg.offset; | |
10499 | end = start + 1; | |
10500 | } | |
10501 | ||
10502 | ret = io_ring_add_registered_fd(tctx, reg.data, start, end); | |
10503 | if (ret < 0) | |
10504 | break; | |
10505 | ||
10506 | reg.offset = ret; | |
10507 | if (copy_to_user(&arg[i], ®, sizeof(reg))) { | |
10508 | fput(tctx->registered_rings[reg.offset]); | |
10509 | tctx->registered_rings[reg.offset] = NULL; | |
10510 | ret = -EFAULT; | |
10511 | break; | |
10512 | } | |
10513 | } | |
10514 | ||
10515 | return i ? i : ret; | |
10516 | } | |
10517 | ||
10518 | static int io_ringfd_unregister(struct io_ring_ctx *ctx, void __user *__arg, | |
10519 | unsigned nr_args) | |
10520 | { | |
10521 | struct io_uring_rsrc_update __user *arg = __arg; | |
10522 | struct io_uring_task *tctx = current->io_uring; | |
10523 | struct io_uring_rsrc_update reg; | |
10524 | int ret = 0, i; | |
10525 | ||
10526 | if (!nr_args || nr_args > IO_RINGFD_REG_MAX) | |
10527 | return -EINVAL; | |
10528 | if (!tctx) | |
10529 | return 0; | |
10530 | ||
10531 | for (i = 0; i < nr_args; i++) { | |
10532 | if (copy_from_user(®, &arg[i], sizeof(reg))) { | |
10533 | ret = -EFAULT; | |
10534 | break; | |
10535 | } | |
6fb53cf8 | 10536 | if (reg.resv || reg.offset >= IO_RINGFD_REG_MAX) { |
e7a6c00d JA |
10537 | ret = -EINVAL; |
10538 | break; | |
10539 | } | |
10540 | ||
10541 | reg.offset = array_index_nospec(reg.offset, IO_RINGFD_REG_MAX); | |
10542 | if (tctx->registered_rings[reg.offset]) { | |
10543 | fput(tctx->registered_rings[reg.offset]); | |
10544 | tctx->registered_rings[reg.offset] = NULL; | |
10545 | } | |
10546 | } | |
10547 | ||
10548 | return i ? i : ret; | |
10549 | } | |
10550 | ||
6c5c240e RP |
10551 | static void *io_uring_validate_mmap_request(struct file *file, |
10552 | loff_t pgoff, size_t sz) | |
2b188cc1 | 10553 | { |
2b188cc1 | 10554 | struct io_ring_ctx *ctx = file->private_data; |
6c5c240e | 10555 | loff_t offset = pgoff << PAGE_SHIFT; |
2b188cc1 JA |
10556 | struct page *page; |
10557 | void *ptr; | |
10558 | ||
10559 | switch (offset) { | |
10560 | case IORING_OFF_SQ_RING: | |
75b28aff HV |
10561 | case IORING_OFF_CQ_RING: |
10562 | ptr = ctx->rings; | |
2b188cc1 JA |
10563 | break; |
10564 | case IORING_OFF_SQES: | |
10565 | ptr = ctx->sq_sqes; | |
10566 | break; | |
2b188cc1 | 10567 | default: |
6c5c240e | 10568 | return ERR_PTR(-EINVAL); |
2b188cc1 JA |
10569 | } |
10570 | ||
10571 | page = virt_to_head_page(ptr); | |
a50b854e | 10572 | if (sz > page_size(page)) |
6c5c240e RP |
10573 | return ERR_PTR(-EINVAL); |
10574 | ||
10575 | return ptr; | |
10576 | } | |
10577 | ||
10578 | #ifdef CONFIG_MMU | |
10579 | ||
c072481d | 10580 | static __cold int io_uring_mmap(struct file *file, struct vm_area_struct *vma) |
6c5c240e RP |
10581 | { |
10582 | size_t sz = vma->vm_end - vma->vm_start; | |
10583 | unsigned long pfn; | |
10584 | void *ptr; | |
10585 | ||
10586 | ptr = io_uring_validate_mmap_request(file, vma->vm_pgoff, sz); | |
10587 | if (IS_ERR(ptr)) | |
10588 | return PTR_ERR(ptr); | |
2b188cc1 JA |
10589 | |
10590 | pfn = virt_to_phys(ptr) >> PAGE_SHIFT; | |
10591 | return remap_pfn_range(vma, vma->vm_start, pfn, sz, vma->vm_page_prot); | |
10592 | } | |
10593 | ||
6c5c240e RP |
10594 | #else /* !CONFIG_MMU */ |
10595 | ||
10596 | static int io_uring_mmap(struct file *file, struct vm_area_struct *vma) | |
10597 | { | |
10598 | return vma->vm_flags & (VM_SHARED | VM_MAYSHARE) ? 0 : -EINVAL; | |
10599 | } | |
10600 | ||
10601 | static unsigned int io_uring_nommu_mmap_capabilities(struct file *file) | |
10602 | { | |
10603 | return NOMMU_MAP_DIRECT | NOMMU_MAP_READ | NOMMU_MAP_WRITE; | |
10604 | } | |
10605 | ||
10606 | static unsigned long io_uring_nommu_get_unmapped_area(struct file *file, | |
10607 | unsigned long addr, unsigned long len, | |
10608 | unsigned long pgoff, unsigned long flags) | |
10609 | { | |
10610 | void *ptr; | |
10611 | ||
10612 | ptr = io_uring_validate_mmap_request(file, pgoff, len); | |
10613 | if (IS_ERR(ptr)) | |
10614 | return PTR_ERR(ptr); | |
10615 | ||
10616 | return (unsigned long) ptr; | |
10617 | } | |
10618 | ||
10619 | #endif /* !CONFIG_MMU */ | |
10620 | ||
d9d05217 | 10621 | static int io_sqpoll_wait_sq(struct io_ring_ctx *ctx) |
90554200 JA |
10622 | { |
10623 | DEFINE_WAIT(wait); | |
10624 | ||
10625 | do { | |
10626 | if (!io_sqring_full(ctx)) | |
10627 | break; | |
90554200 JA |
10628 | prepare_to_wait(&ctx->sqo_sq_wait, &wait, TASK_INTERRUPTIBLE); |
10629 | ||
10630 | if (!io_sqring_full(ctx)) | |
10631 | break; | |
90554200 JA |
10632 | schedule(); |
10633 | } while (!signal_pending(current)); | |
10634 | ||
10635 | finish_wait(&ctx->sqo_sq_wait, &wait); | |
5199328a | 10636 | return 0; |
90554200 JA |
10637 | } |
10638 | ||
f81440d3 PB |
10639 | static int io_validate_ext_arg(unsigned flags, const void __user *argp, size_t argsz) |
10640 | { | |
10641 | if (flags & IORING_ENTER_EXT_ARG) { | |
10642 | struct io_uring_getevents_arg arg; | |
10643 | ||
10644 | if (argsz != sizeof(arg)) | |
10645 | return -EINVAL; | |
10646 | if (copy_from_user(&arg, argp, sizeof(arg))) | |
10647 | return -EFAULT; | |
10648 | } | |
10649 | return 0; | |
10650 | } | |
10651 | ||
c73ebb68 HX |
10652 | static int io_get_ext_arg(unsigned flags, const void __user *argp, size_t *argsz, |
10653 | struct __kernel_timespec __user **ts, | |
10654 | const sigset_t __user **sig) | |
10655 | { | |
10656 | struct io_uring_getevents_arg arg; | |
10657 | ||
10658 | /* | |
10659 | * If EXT_ARG isn't set, then we have no timespec and the argp pointer | |
10660 | * is just a pointer to the sigset_t. | |
10661 | */ | |
10662 | if (!(flags & IORING_ENTER_EXT_ARG)) { | |
10663 | *sig = (const sigset_t __user *) argp; | |
10664 | *ts = NULL; | |
10665 | return 0; | |
10666 | } | |
10667 | ||
10668 | /* | |
10669 | * EXT_ARG is set - ensure we agree on the size of it and copy in our | |
10670 | * timespec and sigset_t pointers if good. | |
10671 | */ | |
10672 | if (*argsz != sizeof(arg)) | |
10673 | return -EINVAL; | |
10674 | if (copy_from_user(&arg, argp, sizeof(arg))) | |
10675 | return -EFAULT; | |
d2347b96 DY |
10676 | if (arg.pad) |
10677 | return -EINVAL; | |
c73ebb68 HX |
10678 | *sig = u64_to_user_ptr(arg.sigmask); |
10679 | *argsz = arg.sigmask_sz; | |
10680 | *ts = u64_to_user_ptr(arg.ts); | |
10681 | return 0; | |
10682 | } | |
10683 | ||
2b188cc1 | 10684 | SYSCALL_DEFINE6(io_uring_enter, unsigned int, fd, u32, to_submit, |
c73ebb68 HX |
10685 | u32, min_complete, u32, flags, const void __user *, argp, |
10686 | size_t, argsz) | |
2b188cc1 JA |
10687 | { |
10688 | struct io_ring_ctx *ctx; | |
2b188cc1 JA |
10689 | int submitted = 0; |
10690 | struct fd f; | |
33f993da | 10691 | long ret; |
2b188cc1 | 10692 | |
4c6e277c | 10693 | io_run_task_work(); |
b41e9852 | 10694 | |
33f993da | 10695 | if (unlikely(flags & ~(IORING_ENTER_GETEVENTS | IORING_ENTER_SQ_WAKEUP | |
e7a6c00d JA |
10696 | IORING_ENTER_SQ_WAIT | IORING_ENTER_EXT_ARG | |
10697 | IORING_ENTER_REGISTERED_RING))) | |
2b188cc1 JA |
10698 | return -EINVAL; |
10699 | ||
e7a6c00d JA |
10700 | /* |
10701 | * Ring fd has been registered via IORING_REGISTER_RING_FDS, we | |
10702 | * need only dereference our task private array to find it. | |
10703 | */ | |
10704 | if (flags & IORING_ENTER_REGISTERED_RING) { | |
10705 | struct io_uring_task *tctx = current->io_uring; | |
10706 | ||
10707 | if (!tctx || fd >= IO_RINGFD_REG_MAX) | |
10708 | return -EINVAL; | |
10709 | fd = array_index_nospec(fd, IO_RINGFD_REG_MAX); | |
10710 | f.file = tctx->registered_rings[fd]; | |
10711 | if (unlikely(!f.file)) | |
10712 | return -EBADF; | |
10713 | } else { | |
10714 | f = fdget(fd); | |
10715 | if (unlikely(!f.file)) | |
10716 | return -EBADF; | |
10717 | } | |
2b188cc1 JA |
10718 | |
10719 | ret = -EOPNOTSUPP; | |
33f993da | 10720 | if (unlikely(f.file->f_op != &io_uring_fops)) |
2b188cc1 JA |
10721 | goto out_fput; |
10722 | ||
10723 | ret = -ENXIO; | |
10724 | ctx = f.file->private_data; | |
33f993da | 10725 | if (unlikely(!percpu_ref_tryget(&ctx->refs))) |
2b188cc1 JA |
10726 | goto out_fput; |
10727 | ||
7e84e1c7 | 10728 | ret = -EBADFD; |
33f993da | 10729 | if (unlikely(ctx->flags & IORING_SETUP_R_DISABLED)) |
7e84e1c7 SG |
10730 | goto out; |
10731 | ||
6c271ce2 JA |
10732 | /* |
10733 | * For SQ polling, the thread will do all submissions and completions. | |
10734 | * Just return the requested submit count, and wake the thread if | |
10735 | * we were asked to. | |
10736 | */ | |
b2a9eada | 10737 | ret = 0; |
6c271ce2 | 10738 | if (ctx->flags & IORING_SETUP_SQPOLL) { |
90f67366 | 10739 | io_cqring_overflow_flush(ctx); |
89448c47 | 10740 | |
21f96522 JA |
10741 | if (unlikely(ctx->sq_data->thread == NULL)) { |
10742 | ret = -EOWNERDEAD; | |
04147488 | 10743 | goto out; |
21f96522 | 10744 | } |
6c271ce2 | 10745 | if (flags & IORING_ENTER_SQ_WAKEUP) |
534ca6d6 | 10746 | wake_up(&ctx->sq_data->wait); |
d9d05217 PB |
10747 | if (flags & IORING_ENTER_SQ_WAIT) { |
10748 | ret = io_sqpoll_wait_sq(ctx); | |
10749 | if (ret) | |
10750 | goto out; | |
10751 | } | |
6c271ce2 | 10752 | submitted = to_submit; |
b2a9eada | 10753 | } else if (to_submit) { |
eef51daa | 10754 | ret = io_uring_add_tctx_node(ctx); |
0f212204 JA |
10755 | if (unlikely(ret)) |
10756 | goto out; | |
d487b43c | 10757 | |
2b188cc1 | 10758 | mutex_lock(&ctx->uring_lock); |
0f212204 | 10759 | submitted = io_submit_sqes(ctx, to_submit); |
d487b43c PB |
10760 | if (submitted != to_submit) { |
10761 | mutex_unlock(&ctx->uring_lock); | |
7c504e65 | 10762 | goto out; |
d487b43c PB |
10763 | } |
10764 | if ((flags & IORING_ENTER_GETEVENTS) && ctx->syscall_iopoll) | |
10765 | goto iopoll_locked; | |
10766 | mutex_unlock(&ctx->uring_lock); | |
2b188cc1 JA |
10767 | } |
10768 | if (flags & IORING_ENTER_GETEVENTS) { | |
773697b6 | 10769 | if (ctx->syscall_iopoll) { |
d487b43c PB |
10770 | /* |
10771 | * We disallow the app entering submit/complete with | |
10772 | * polling, but we still need to lock the ring to | |
10773 | * prevent racing with polled issue that got punted to | |
10774 | * a workqueue. | |
10775 | */ | |
10776 | mutex_lock(&ctx->uring_lock); | |
10777 | iopoll_locked: | |
f81440d3 | 10778 | ret = io_validate_ext_arg(flags, argp, argsz); |
d487b43c PB |
10779 | if (likely(!ret)) { |
10780 | min_complete = min(min_complete, ctx->cq_entries); | |
10781 | ret = io_iopoll_check(ctx, min_complete); | |
10782 | } | |
10783 | mutex_unlock(&ctx->uring_lock); | |
def596e9 | 10784 | } else { |
f81440d3 PB |
10785 | const sigset_t __user *sig; |
10786 | struct __kernel_timespec __user *ts; | |
10787 | ||
10788 | ret = io_get_ext_arg(flags, argp, &argsz, &ts, &sig); | |
10789 | if (unlikely(ret)) | |
10790 | goto out; | |
d487b43c | 10791 | min_complete = min(min_complete, ctx->cq_entries); |
c73ebb68 | 10792 | ret = io_cqring_wait(ctx, min_complete, sig, argsz, ts); |
def596e9 | 10793 | } |
2b188cc1 JA |
10794 | } |
10795 | ||
7c504e65 | 10796 | out: |
6805b32e | 10797 | percpu_ref_put(&ctx->refs); |
2b188cc1 | 10798 | out_fput: |
e7a6c00d JA |
10799 | if (!(flags & IORING_ENTER_REGISTERED_RING)) |
10800 | fdput(f); | |
2b188cc1 JA |
10801 | return submitted ? submitted : ret; |
10802 | } | |
10803 | ||
bebdb65e | 10804 | #ifdef CONFIG_PROC_FS |
c072481d | 10805 | static __cold int io_uring_show_cred(struct seq_file *m, unsigned int id, |
61cf9370 | 10806 | const struct cred *cred) |
87ce955b | 10807 | { |
87ce955b JA |
10808 | struct user_namespace *uns = seq_user_ns(m); |
10809 | struct group_info *gi; | |
10810 | kernel_cap_t cap; | |
10811 | unsigned __capi; | |
10812 | int g; | |
10813 | ||
10814 | seq_printf(m, "%5d\n", id); | |
10815 | seq_put_decimal_ull(m, "\tUid:\t", from_kuid_munged(uns, cred->uid)); | |
10816 | seq_put_decimal_ull(m, "\t\t", from_kuid_munged(uns, cred->euid)); | |
10817 | seq_put_decimal_ull(m, "\t\t", from_kuid_munged(uns, cred->suid)); | |
10818 | seq_put_decimal_ull(m, "\t\t", from_kuid_munged(uns, cred->fsuid)); | |
10819 | seq_put_decimal_ull(m, "\n\tGid:\t", from_kgid_munged(uns, cred->gid)); | |
10820 | seq_put_decimal_ull(m, "\t\t", from_kgid_munged(uns, cred->egid)); | |
10821 | seq_put_decimal_ull(m, "\t\t", from_kgid_munged(uns, cred->sgid)); | |
10822 | seq_put_decimal_ull(m, "\t\t", from_kgid_munged(uns, cred->fsgid)); | |
10823 | seq_puts(m, "\n\tGroups:\t"); | |
10824 | gi = cred->group_info; | |
10825 | for (g = 0; g < gi->ngroups; g++) { | |
10826 | seq_put_decimal_ull(m, g ? " " : "", | |
10827 | from_kgid_munged(uns, gi->gid[g])); | |
10828 | } | |
10829 | seq_puts(m, "\n\tCapEff:\t"); | |
10830 | cap = cred->cap_effective; | |
10831 | CAP_FOR_EACH_U32(__capi) | |
10832 | seq_put_hex_ll(m, NULL, cap.cap[CAP_LAST_U32 - __capi], 8); | |
10833 | seq_putc(m, '\n'); | |
10834 | return 0; | |
10835 | } | |
10836 | ||
c072481d PB |
10837 | static __cold void __io_uring_show_fdinfo(struct io_ring_ctx *ctx, |
10838 | struct seq_file *m) | |
87ce955b | 10839 | { |
dbbe9c64 | 10840 | struct io_sq_data *sq = NULL; |
83f84356 HX |
10841 | struct io_overflow_cqe *ocqe; |
10842 | struct io_rings *r = ctx->rings; | |
10843 | unsigned int sq_mask = ctx->sq_entries - 1, cq_mask = ctx->cq_entries - 1; | |
83f84356 HX |
10844 | unsigned int sq_head = READ_ONCE(r->sq.head); |
10845 | unsigned int sq_tail = READ_ONCE(r->sq.tail); | |
10846 | unsigned int cq_head = READ_ONCE(r->cq.head); | |
10847 | unsigned int cq_tail = READ_ONCE(r->cq.tail); | |
f75d1183 | 10848 | unsigned int sq_entries, cq_entries; |
fad8e0de | 10849 | bool has_lock; |
83f84356 HX |
10850 | unsigned int i; |
10851 | ||
10852 | /* | |
10853 | * we may get imprecise sqe and cqe info if uring is actively running | |
10854 | * since we get cached_sq_head and cached_cq_tail without uring_lock | |
10855 | * and sq_tail and cq_head are changed by userspace. But it's ok since | |
10856 | * we usually use these info when it is stuck. | |
10857 | */ | |
c0235652 | 10858 | seq_printf(m, "SqMask:\t0x%x\n", sq_mask); |
f75d1183 JA |
10859 | seq_printf(m, "SqHead:\t%u\n", sq_head); |
10860 | seq_printf(m, "SqTail:\t%u\n", sq_tail); | |
10861 | seq_printf(m, "CachedSqHead:\t%u\n", ctx->cached_sq_head); | |
10862 | seq_printf(m, "CqMask:\t0x%x\n", cq_mask); | |
10863 | seq_printf(m, "CqHead:\t%u\n", cq_head); | |
10864 | seq_printf(m, "CqTail:\t%u\n", cq_tail); | |
10865 | seq_printf(m, "CachedCqTail:\t%u\n", ctx->cached_cq_tail); | |
10866 | seq_printf(m, "SQEs:\t%u\n", sq_tail - ctx->cached_sq_head); | |
10867 | sq_entries = min(sq_tail - sq_head, ctx->sq_entries); | |
10868 | for (i = 0; i < sq_entries; i++) { | |
10869 | unsigned int entry = i + sq_head; | |
10870 | unsigned int sq_idx = READ_ONCE(ctx->sq_array[entry & sq_mask]); | |
a1957780 | 10871 | struct io_uring_sqe *sqe; |
f75d1183 JA |
10872 | |
10873 | if (sq_idx > sq_mask) | |
10874 | continue; | |
10875 | sqe = &ctx->sq_sqes[sq_idx]; | |
10876 | seq_printf(m, "%5u: opcode:%d, fd:%d, flags:%x, user_data:%llu\n", | |
10877 | sq_idx, sqe->opcode, sqe->fd, sqe->flags, | |
10878 | sqe->user_data); | |
83f84356 | 10879 | } |
f75d1183 JA |
10880 | seq_printf(m, "CQEs:\t%u\n", cq_tail - cq_head); |
10881 | cq_entries = min(cq_tail - cq_head, ctx->cq_entries); | |
10882 | for (i = 0; i < cq_entries; i++) { | |
10883 | unsigned int entry = i + cq_head; | |
10884 | struct io_uring_cqe *cqe = &r->cqes[entry & cq_mask]; | |
83f84356 HX |
10885 | |
10886 | seq_printf(m, "%5u: user_data:%llu, res:%d, flag:%x\n", | |
f75d1183 JA |
10887 | entry & cq_mask, cqe->user_data, cqe->res, |
10888 | cqe->flags); | |
83f84356 | 10889 | } |
87ce955b | 10890 | |
fad8e0de JA |
10891 | /* |
10892 | * Avoid ABBA deadlock between the seq lock and the io_uring mutex, | |
10893 | * since fdinfo case grabs it in the opposite direction of normal use | |
10894 | * cases. If we fail to get the lock, we just don't iterate any | |
10895 | * structures that could be going away outside the io_uring mutex. | |
10896 | */ | |
10897 | has_lock = mutex_trylock(&ctx->uring_lock); | |
10898 | ||
5f3f26f9 | 10899 | if (has_lock && (ctx->flags & IORING_SETUP_SQPOLL)) { |
dbbe9c64 | 10900 | sq = ctx->sq_data; |
5f3f26f9 JA |
10901 | if (!sq->thread) |
10902 | sq = NULL; | |
10903 | } | |
dbbe9c64 JQ |
10904 | |
10905 | seq_printf(m, "SqThread:\t%d\n", sq ? task_pid_nr(sq->thread) : -1); | |
10906 | seq_printf(m, "SqThreadCpu:\t%d\n", sq ? task_cpu(sq->thread) : -1); | |
87ce955b | 10907 | seq_printf(m, "UserFiles:\t%u\n", ctx->nr_user_files); |
fad8e0de | 10908 | for (i = 0; has_lock && i < ctx->nr_user_files; i++) { |
7b29f92d | 10909 | struct file *f = io_file_from_index(ctx, i); |
87ce955b | 10910 | |
87ce955b JA |
10911 | if (f) |
10912 | seq_printf(m, "%5u: %s\n", i, file_dentry(f)->d_iname); | |
10913 | else | |
10914 | seq_printf(m, "%5u: <none>\n", i); | |
10915 | } | |
10916 | seq_printf(m, "UserBufs:\t%u\n", ctx->nr_user_bufs); | |
fad8e0de | 10917 | for (i = 0; has_lock && i < ctx->nr_user_bufs; i++) { |
41edf1a5 | 10918 | struct io_mapped_ubuf *buf = ctx->user_bufs[i]; |
4751f53d | 10919 | unsigned int len = buf->ubuf_end - buf->ubuf; |
87ce955b | 10920 | |
4751f53d | 10921 | seq_printf(m, "%5u: 0x%llx/%u\n", i, buf->ubuf, len); |
87ce955b | 10922 | } |
61cf9370 MWO |
10923 | if (has_lock && !xa_empty(&ctx->personalities)) { |
10924 | unsigned long index; | |
10925 | const struct cred *cred; | |
10926 | ||
87ce955b | 10927 | seq_printf(m, "Personalities:\n"); |
61cf9370 MWO |
10928 | xa_for_each(&ctx->personalities, index, cred) |
10929 | io_uring_show_cred(m, index, cred); | |
87ce955b | 10930 | } |
83f84356 HX |
10931 | if (has_lock) |
10932 | mutex_unlock(&ctx->uring_lock); | |
10933 | ||
10934 | seq_puts(m, "PollList:\n"); | |
79ebeaee | 10935 | spin_lock(&ctx->completion_lock); |
d7718a9d JA |
10936 | for (i = 0; i < (1U << ctx->cancel_hash_bits); i++) { |
10937 | struct hlist_head *list = &ctx->cancel_hash[i]; | |
10938 | struct io_kiocb *req; | |
10939 | ||
10940 | hlist_for_each_entry(req, list, hash_node) | |
10941 | seq_printf(m, " op=%d, task_works=%d\n", req->opcode, | |
7f62d40d | 10942 | task_work_pending(req->task)); |
d7718a9d | 10943 | } |
83f84356 HX |
10944 | |
10945 | seq_puts(m, "CqOverflowList:\n"); | |
10946 | list_for_each_entry(ocqe, &ctx->cq_overflow_list, list) { | |
10947 | struct io_uring_cqe *cqe = &ocqe->cqe; | |
10948 | ||
10949 | seq_printf(m, " user_data=%llu, res=%d, flags=%x\n", | |
10950 | cqe->user_data, cqe->res, cqe->flags); | |
10951 | ||
10952 | } | |
10953 | ||
79ebeaee | 10954 | spin_unlock(&ctx->completion_lock); |
87ce955b JA |
10955 | } |
10956 | ||
c072481d | 10957 | static __cold void io_uring_show_fdinfo(struct seq_file *m, struct file *f) |
87ce955b JA |
10958 | { |
10959 | struct io_ring_ctx *ctx = f->private_data; | |
10960 | ||
10961 | if (percpu_ref_tryget(&ctx->refs)) { | |
10962 | __io_uring_show_fdinfo(ctx, m); | |
10963 | percpu_ref_put(&ctx->refs); | |
10964 | } | |
10965 | } | |
bebdb65e | 10966 | #endif |
87ce955b | 10967 | |
2b188cc1 JA |
10968 | static const struct file_operations io_uring_fops = { |
10969 | .release = io_uring_release, | |
10970 | .mmap = io_uring_mmap, | |
6c5c240e RP |
10971 | #ifndef CONFIG_MMU |
10972 | .get_unmapped_area = io_uring_nommu_get_unmapped_area, | |
10973 | .mmap_capabilities = io_uring_nommu_mmap_capabilities, | |
10974 | #endif | |
2b188cc1 | 10975 | .poll = io_uring_poll, |
bebdb65e | 10976 | #ifdef CONFIG_PROC_FS |
87ce955b | 10977 | .show_fdinfo = io_uring_show_fdinfo, |
bebdb65e | 10978 | #endif |
2b188cc1 JA |
10979 | }; |
10980 | ||
c072481d PB |
10981 | static __cold int io_allocate_scq_urings(struct io_ring_ctx *ctx, |
10982 | struct io_uring_params *p) | |
2b188cc1 | 10983 | { |
75b28aff HV |
10984 | struct io_rings *rings; |
10985 | size_t size, sq_array_offset; | |
2b188cc1 | 10986 | |
bd740481 JA |
10987 | /* make sure these are sane, as we already accounted them */ |
10988 | ctx->sq_entries = p->sq_entries; | |
10989 | ctx->cq_entries = p->cq_entries; | |
10990 | ||
75b28aff HV |
10991 | size = rings_size(p->sq_entries, p->cq_entries, &sq_array_offset); |
10992 | if (size == SIZE_MAX) | |
10993 | return -EOVERFLOW; | |
10994 | ||
10995 | rings = io_mem_alloc(size); | |
10996 | if (!rings) | |
2b188cc1 JA |
10997 | return -ENOMEM; |
10998 | ||
75b28aff HV |
10999 | ctx->rings = rings; |
11000 | ctx->sq_array = (u32 *)((char *)rings + sq_array_offset); | |
11001 | rings->sq_ring_mask = p->sq_entries - 1; | |
11002 | rings->cq_ring_mask = p->cq_entries - 1; | |
11003 | rings->sq_ring_entries = p->sq_entries; | |
11004 | rings->cq_ring_entries = p->cq_entries; | |
2b188cc1 JA |
11005 | |
11006 | size = array_size(sizeof(struct io_uring_sqe), p->sq_entries); | |
eb065d30 JA |
11007 | if (size == SIZE_MAX) { |
11008 | io_mem_free(ctx->rings); | |
11009 | ctx->rings = NULL; | |
2b188cc1 | 11010 | return -EOVERFLOW; |
eb065d30 | 11011 | } |
2b188cc1 JA |
11012 | |
11013 | ctx->sq_sqes = io_mem_alloc(size); | |
eb065d30 JA |
11014 | if (!ctx->sq_sqes) { |
11015 | io_mem_free(ctx->rings); | |
11016 | ctx->rings = NULL; | |
2b188cc1 | 11017 | return -ENOMEM; |
eb065d30 | 11018 | } |
2b188cc1 | 11019 | |
2b188cc1 JA |
11020 | return 0; |
11021 | } | |
11022 | ||
9faadcc8 PB |
11023 | static int io_uring_install_fd(struct io_ring_ctx *ctx, struct file *file) |
11024 | { | |
11025 | int ret, fd; | |
11026 | ||
11027 | fd = get_unused_fd_flags(O_RDWR | O_CLOEXEC); | |
11028 | if (fd < 0) | |
11029 | return fd; | |
11030 | ||
eef51daa | 11031 | ret = io_uring_add_tctx_node(ctx); |
9faadcc8 PB |
11032 | if (ret) { |
11033 | put_unused_fd(fd); | |
11034 | return ret; | |
11035 | } | |
11036 | fd_install(fd, file); | |
11037 | return fd; | |
11038 | } | |
11039 | ||
2b188cc1 JA |
11040 | /* |
11041 | * Allocate an anonymous fd, this is what constitutes the application | |
11042 | * visible backing of an io_uring instance. The application mmaps this | |
11043 | * fd to gain access to the SQ/CQ ring details. If UNIX sockets are enabled, | |
11044 | * we have to tie this fd to a socket for file garbage collection purposes. | |
11045 | */ | |
9faadcc8 | 11046 | static struct file *io_uring_get_file(struct io_ring_ctx *ctx) |
2b188cc1 JA |
11047 | { |
11048 | struct file *file; | |
9faadcc8 | 11049 | #if defined(CONFIG_UNIX) |
2b188cc1 JA |
11050 | int ret; |
11051 | ||
2b188cc1 JA |
11052 | ret = sock_create_kern(&init_net, PF_UNIX, SOCK_RAW, IPPROTO_IP, |
11053 | &ctx->ring_sock); | |
11054 | if (ret) | |
9faadcc8 | 11055 | return ERR_PTR(ret); |
2b188cc1 JA |
11056 | #endif |
11057 | ||
91a9ab7c PM |
11058 | file = anon_inode_getfile_secure("[io_uring]", &io_uring_fops, ctx, |
11059 | O_RDWR | O_CLOEXEC, NULL); | |
2b188cc1 | 11060 | #if defined(CONFIG_UNIX) |
9faadcc8 PB |
11061 | if (IS_ERR(file)) { |
11062 | sock_release(ctx->ring_sock); | |
11063 | ctx->ring_sock = NULL; | |
11064 | } else { | |
11065 | ctx->ring_sock->file = file; | |
0f212204 | 11066 | } |
2b188cc1 | 11067 | #endif |
9faadcc8 | 11068 | return file; |
2b188cc1 JA |
11069 | } |
11070 | ||
c072481d PB |
11071 | static __cold int io_uring_create(unsigned entries, struct io_uring_params *p, |
11072 | struct io_uring_params __user *params) | |
2b188cc1 | 11073 | { |
2b188cc1 | 11074 | struct io_ring_ctx *ctx; |
9faadcc8 | 11075 | struct file *file; |
2b188cc1 JA |
11076 | int ret; |
11077 | ||
8110c1a6 | 11078 | if (!entries) |
2b188cc1 | 11079 | return -EINVAL; |
8110c1a6 JA |
11080 | if (entries > IORING_MAX_ENTRIES) { |
11081 | if (!(p->flags & IORING_SETUP_CLAMP)) | |
11082 | return -EINVAL; | |
11083 | entries = IORING_MAX_ENTRIES; | |
11084 | } | |
2b188cc1 JA |
11085 | |
11086 | /* | |
11087 | * Use twice as many entries for the CQ ring. It's possible for the | |
11088 | * application to drive a higher depth than the size of the SQ ring, | |
11089 | * since the sqes are only used at submission time. This allows for | |
33a107f0 JA |
11090 | * some flexibility in overcommitting a bit. If the application has |
11091 | * set IORING_SETUP_CQSIZE, it will have passed in the desired number | |
11092 | * of CQ ring entries manually. | |
2b188cc1 JA |
11093 | */ |
11094 | p->sq_entries = roundup_pow_of_two(entries); | |
33a107f0 JA |
11095 | if (p->flags & IORING_SETUP_CQSIZE) { |
11096 | /* | |
11097 | * If IORING_SETUP_CQSIZE is set, we do the same roundup | |
11098 | * to a power-of-two, if it isn't already. We do NOT impose | |
11099 | * any cq vs sq ring sizing. | |
11100 | */ | |
eb2667b3 | 11101 | if (!p->cq_entries) |
33a107f0 | 11102 | return -EINVAL; |
8110c1a6 JA |
11103 | if (p->cq_entries > IORING_MAX_CQ_ENTRIES) { |
11104 | if (!(p->flags & IORING_SETUP_CLAMP)) | |
11105 | return -EINVAL; | |
11106 | p->cq_entries = IORING_MAX_CQ_ENTRIES; | |
11107 | } | |
eb2667b3 JQ |
11108 | p->cq_entries = roundup_pow_of_two(p->cq_entries); |
11109 | if (p->cq_entries < p->sq_entries) | |
11110 | return -EINVAL; | |
33a107f0 JA |
11111 | } else { |
11112 | p->cq_entries = 2 * p->sq_entries; | |
11113 | } | |
2b188cc1 | 11114 | |
2b188cc1 | 11115 | ctx = io_ring_ctx_alloc(p); |
62e398be | 11116 | if (!ctx) |
2b188cc1 | 11117 | return -ENOMEM; |
773697b6 PB |
11118 | |
11119 | /* | |
11120 | * When SETUP_IOPOLL and SETUP_SQPOLL are both enabled, user | |
11121 | * space applications don't need to do io completion events | |
11122 | * polling again, they can rely on io_sq_thread to do polling | |
11123 | * work, which can reduce cpu usage and uring_lock contention. | |
11124 | */ | |
11125 | if (ctx->flags & IORING_SETUP_IOPOLL && | |
11126 | !(ctx->flags & IORING_SETUP_SQPOLL)) | |
11127 | ctx->syscall_iopoll = 1; | |
11128 | ||
2b188cc1 | 11129 | ctx->compat = in_compat_syscall(); |
62e398be JA |
11130 | if (!capable(CAP_IPC_LOCK)) |
11131 | ctx->user = get_uid(current_user()); | |
2aede0e4 JA |
11132 | |
11133 | /* | |
11134 | * This is just grabbed for accounting purposes. When a process exits, | |
11135 | * the mm is exited and dropped before the files, hence we need to hang | |
11136 | * on to this mm purely for the purposes of being able to unaccount | |
11137 | * memory (locked/pinned vm). It's not used for anything else. | |
11138 | */ | |
6b7898eb | 11139 | mmgrab(current->mm); |
2aede0e4 | 11140 | ctx->mm_account = current->mm; |
6b7898eb | 11141 | |
2b188cc1 JA |
11142 | ret = io_allocate_scq_urings(ctx, p); |
11143 | if (ret) | |
11144 | goto err; | |
11145 | ||
7e84e1c7 | 11146 | ret = io_sq_offload_create(ctx, p); |
2b188cc1 JA |
11147 | if (ret) |
11148 | goto err; | |
eae071c9 | 11149 | /* always set a rsrc node */ |
47b228ce PB |
11150 | ret = io_rsrc_node_switch_start(ctx); |
11151 | if (ret) | |
11152 | goto err; | |
eae071c9 | 11153 | io_rsrc_node_switch(ctx, NULL); |
2b188cc1 | 11154 | |
2b188cc1 | 11155 | memset(&p->sq_off, 0, sizeof(p->sq_off)); |
75b28aff HV |
11156 | p->sq_off.head = offsetof(struct io_rings, sq.head); |
11157 | p->sq_off.tail = offsetof(struct io_rings, sq.tail); | |
11158 | p->sq_off.ring_mask = offsetof(struct io_rings, sq_ring_mask); | |
11159 | p->sq_off.ring_entries = offsetof(struct io_rings, sq_ring_entries); | |
11160 | p->sq_off.flags = offsetof(struct io_rings, sq_flags); | |
11161 | p->sq_off.dropped = offsetof(struct io_rings, sq_dropped); | |
11162 | p->sq_off.array = (char *)ctx->sq_array - (char *)ctx->rings; | |
2b188cc1 JA |
11163 | |
11164 | memset(&p->cq_off, 0, sizeof(p->cq_off)); | |
75b28aff HV |
11165 | p->cq_off.head = offsetof(struct io_rings, cq.head); |
11166 | p->cq_off.tail = offsetof(struct io_rings, cq.tail); | |
11167 | p->cq_off.ring_mask = offsetof(struct io_rings, cq_ring_mask); | |
11168 | p->cq_off.ring_entries = offsetof(struct io_rings, cq_ring_entries); | |
11169 | p->cq_off.overflow = offsetof(struct io_rings, cq_overflow); | |
11170 | p->cq_off.cqes = offsetof(struct io_rings, cqes); | |
0d9b5b3a | 11171 | p->cq_off.flags = offsetof(struct io_rings, cq_flags); |
ac90f249 | 11172 | |
7f13657d XW |
11173 | p->features = IORING_FEAT_SINGLE_MMAP | IORING_FEAT_NODROP | |
11174 | IORING_FEAT_SUBMIT_STABLE | IORING_FEAT_RW_CUR_POS | | |
5769a351 | 11175 | IORING_FEAT_CUR_PERSONALITY | IORING_FEAT_FAST_POLL | |
c73ebb68 | 11176 | IORING_FEAT_POLL_32BITS | IORING_FEAT_SQPOLL_NONFIXED | |
9690557e | 11177 | IORING_FEAT_EXT_ARG | IORING_FEAT_NATIVE_WORKERS | |
c4212f3e JA |
11178 | IORING_FEAT_RSRC_TAGS | IORING_FEAT_CQE_SKIP | |
11179 | IORING_FEAT_LINKED_FILE; | |
7f13657d XW |
11180 | |
11181 | if (copy_to_user(params, p, sizeof(*p))) { | |
11182 | ret = -EFAULT; | |
11183 | goto err; | |
11184 | } | |
d1719f70 | 11185 | |
9faadcc8 PB |
11186 | file = io_uring_get_file(ctx); |
11187 | if (IS_ERR(file)) { | |
11188 | ret = PTR_ERR(file); | |
11189 | goto err; | |
11190 | } | |
11191 | ||
044c1ab3 JA |
11192 | /* |
11193 | * Install ring fd as the very last thing, so we don't risk someone | |
11194 | * having closed it before we finish setup | |
11195 | */ | |
9faadcc8 PB |
11196 | ret = io_uring_install_fd(ctx, file); |
11197 | if (ret < 0) { | |
11198 | /* fput will clean it up */ | |
11199 | fput(file); | |
11200 | return ret; | |
11201 | } | |
044c1ab3 | 11202 | |
c826bd7a | 11203 | trace_io_uring_create(ret, ctx, p->sq_entries, p->cq_entries, p->flags); |
2b188cc1 JA |
11204 | return ret; |
11205 | err: | |
11206 | io_ring_ctx_wait_and_kill(ctx); | |
11207 | return ret; | |
11208 | } | |
11209 | ||
11210 | /* | |
11211 | * Sets up an aio uring context, and returns the fd. Applications asks for a | |
11212 | * ring size, we return the actual sq/cq ring sizes (among other things) in the | |
11213 | * params structure passed in. | |
11214 | */ | |
11215 | static long io_uring_setup(u32 entries, struct io_uring_params __user *params) | |
11216 | { | |
11217 | struct io_uring_params p; | |
2b188cc1 JA |
11218 | int i; |
11219 | ||
11220 | if (copy_from_user(&p, params, sizeof(p))) | |
11221 | return -EFAULT; | |
11222 | for (i = 0; i < ARRAY_SIZE(p.resv); i++) { | |
11223 | if (p.resv[i]) | |
11224 | return -EINVAL; | |
11225 | } | |
11226 | ||
6c271ce2 | 11227 | if (p.flags & ~(IORING_SETUP_IOPOLL | IORING_SETUP_SQPOLL | |
8110c1a6 | 11228 | IORING_SETUP_SQ_AFF | IORING_SETUP_CQSIZE | |
7e84e1c7 | 11229 | IORING_SETUP_CLAMP | IORING_SETUP_ATTACH_WQ | |
bcbb7bf6 | 11230 | IORING_SETUP_R_DISABLED | IORING_SETUP_SUBMIT_ALL)) |
2b188cc1 JA |
11231 | return -EINVAL; |
11232 | ||
7f13657d | 11233 | return io_uring_create(entries, &p, params); |
2b188cc1 JA |
11234 | } |
11235 | ||
11236 | SYSCALL_DEFINE2(io_uring_setup, u32, entries, | |
11237 | struct io_uring_params __user *, params) | |
11238 | { | |
11239 | return io_uring_setup(entries, params); | |
11240 | } | |
11241 | ||
c072481d PB |
11242 | static __cold int io_probe(struct io_ring_ctx *ctx, void __user *arg, |
11243 | unsigned nr_args) | |
66f4af93 JA |
11244 | { |
11245 | struct io_uring_probe *p; | |
11246 | size_t size; | |
11247 | int i, ret; | |
11248 | ||
11249 | size = struct_size(p, ops, nr_args); | |
11250 | if (size == SIZE_MAX) | |
11251 | return -EOVERFLOW; | |
11252 | p = kzalloc(size, GFP_KERNEL); | |
11253 | if (!p) | |
11254 | return -ENOMEM; | |
11255 | ||
11256 | ret = -EFAULT; | |
11257 | if (copy_from_user(p, arg, size)) | |
11258 | goto out; | |
11259 | ret = -EINVAL; | |
11260 | if (memchr_inv(p, 0, size)) | |
11261 | goto out; | |
11262 | ||
11263 | p->last_op = IORING_OP_LAST - 1; | |
11264 | if (nr_args > IORING_OP_LAST) | |
11265 | nr_args = IORING_OP_LAST; | |
11266 | ||
11267 | for (i = 0; i < nr_args; i++) { | |
11268 | p->ops[i].op = i; | |
11269 | if (!io_op_defs[i].not_supported) | |
11270 | p->ops[i].flags = IO_URING_OP_SUPPORTED; | |
11271 | } | |
11272 | p->ops_len = i; | |
11273 | ||
11274 | ret = 0; | |
11275 | if (copy_to_user(arg, p, size)) | |
11276 | ret = -EFAULT; | |
11277 | out: | |
11278 | kfree(p); | |
11279 | return ret; | |
11280 | } | |
11281 | ||
071698e1 JA |
11282 | static int io_register_personality(struct io_ring_ctx *ctx) |
11283 | { | |
4379bf8b | 11284 | const struct cred *creds; |
61cf9370 | 11285 | u32 id; |
1e6fa521 | 11286 | int ret; |
071698e1 | 11287 | |
4379bf8b | 11288 | creds = get_current_cred(); |
1e6fa521 | 11289 | |
61cf9370 MWO |
11290 | ret = xa_alloc_cyclic(&ctx->personalities, &id, (void *)creds, |
11291 | XA_LIMIT(0, USHRT_MAX), &ctx->pers_next, GFP_KERNEL); | |
a30f895a JA |
11292 | if (ret < 0) { |
11293 | put_cred(creds); | |
11294 | return ret; | |
11295 | } | |
11296 | return id; | |
071698e1 JA |
11297 | } |
11298 | ||
c072481d PB |
11299 | static __cold int io_register_restrictions(struct io_ring_ctx *ctx, |
11300 | void __user *arg, unsigned int nr_args) | |
21b55dbc SG |
11301 | { |
11302 | struct io_uring_restriction *res; | |
11303 | size_t size; | |
11304 | int i, ret; | |
11305 | ||
7e84e1c7 SG |
11306 | /* Restrictions allowed only if rings started disabled */ |
11307 | if (!(ctx->flags & IORING_SETUP_R_DISABLED)) | |
11308 | return -EBADFD; | |
11309 | ||
21b55dbc | 11310 | /* We allow only a single restrictions registration */ |
7e84e1c7 | 11311 | if (ctx->restrictions.registered) |
21b55dbc SG |
11312 | return -EBUSY; |
11313 | ||
11314 | if (!arg || nr_args > IORING_MAX_RESTRICTIONS) | |
11315 | return -EINVAL; | |
11316 | ||
11317 | size = array_size(nr_args, sizeof(*res)); | |
11318 | if (size == SIZE_MAX) | |
11319 | return -EOVERFLOW; | |
11320 | ||
11321 | res = memdup_user(arg, size); | |
11322 | if (IS_ERR(res)) | |
11323 | return PTR_ERR(res); | |
11324 | ||
11325 | ret = 0; | |
11326 | ||
11327 | for (i = 0; i < nr_args; i++) { | |
11328 | switch (res[i].opcode) { | |
11329 | case IORING_RESTRICTION_REGISTER_OP: | |
11330 | if (res[i].register_op >= IORING_REGISTER_LAST) { | |
11331 | ret = -EINVAL; | |
11332 | goto out; | |
11333 | } | |
11334 | ||
11335 | __set_bit(res[i].register_op, | |
11336 | ctx->restrictions.register_op); | |
11337 | break; | |
11338 | case IORING_RESTRICTION_SQE_OP: | |
11339 | if (res[i].sqe_op >= IORING_OP_LAST) { | |
11340 | ret = -EINVAL; | |
11341 | goto out; | |
11342 | } | |
11343 | ||
11344 | __set_bit(res[i].sqe_op, ctx->restrictions.sqe_op); | |
11345 | break; | |
11346 | case IORING_RESTRICTION_SQE_FLAGS_ALLOWED: | |
11347 | ctx->restrictions.sqe_flags_allowed = res[i].sqe_flags; | |
11348 | break; | |
11349 | case IORING_RESTRICTION_SQE_FLAGS_REQUIRED: | |
11350 | ctx->restrictions.sqe_flags_required = res[i].sqe_flags; | |
11351 | break; | |
11352 | default: | |
11353 | ret = -EINVAL; | |
11354 | goto out; | |
11355 | } | |
11356 | } | |
11357 | ||
11358 | out: | |
11359 | /* Reset all restrictions if an error happened */ | |
11360 | if (ret != 0) | |
11361 | memset(&ctx->restrictions, 0, sizeof(ctx->restrictions)); | |
11362 | else | |
7e84e1c7 | 11363 | ctx->restrictions.registered = true; |
21b55dbc SG |
11364 | |
11365 | kfree(res); | |
11366 | return ret; | |
11367 | } | |
11368 | ||
7e84e1c7 SG |
11369 | static int io_register_enable_rings(struct io_ring_ctx *ctx) |
11370 | { | |
11371 | if (!(ctx->flags & IORING_SETUP_R_DISABLED)) | |
11372 | return -EBADFD; | |
11373 | ||
11374 | if (ctx->restrictions.registered) | |
11375 | ctx->restricted = 1; | |
11376 | ||
0298ef96 PB |
11377 | ctx->flags &= ~IORING_SETUP_R_DISABLED; |
11378 | if (ctx->sq_data && wq_has_sleeper(&ctx->sq_data->wait)) | |
11379 | wake_up(&ctx->sq_data->wait); | |
7e84e1c7 SG |
11380 | return 0; |
11381 | } | |
11382 | ||
fdecb662 | 11383 | static int __io_register_rsrc_update(struct io_ring_ctx *ctx, unsigned type, |
c3bdad02 | 11384 | struct io_uring_rsrc_update2 *up, |
98f0b3b4 PB |
11385 | unsigned nr_args) |
11386 | { | |
11387 | __u32 tmp; | |
11388 | int err; | |
11389 | ||
11390 | if (check_add_overflow(up->offset, nr_args, &tmp)) | |
11391 | return -EOVERFLOW; | |
11392 | err = io_rsrc_node_switch_start(ctx); | |
11393 | if (err) | |
11394 | return err; | |
11395 | ||
fdecb662 PB |
11396 | switch (type) { |
11397 | case IORING_RSRC_FILE: | |
98f0b3b4 | 11398 | return __io_sqe_files_update(ctx, up, nr_args); |
634d00df PB |
11399 | case IORING_RSRC_BUFFER: |
11400 | return __io_sqe_buffers_update(ctx, up, nr_args); | |
98f0b3b4 PB |
11401 | } |
11402 | return -EINVAL; | |
11403 | } | |
11404 | ||
c3bdad02 PB |
11405 | static int io_register_files_update(struct io_ring_ctx *ctx, void __user *arg, |
11406 | unsigned nr_args) | |
98f0b3b4 | 11407 | { |
c3bdad02 | 11408 | struct io_uring_rsrc_update2 up; |
98f0b3b4 PB |
11409 | |
11410 | if (!nr_args) | |
11411 | return -EINVAL; | |
c3bdad02 PB |
11412 | memset(&up, 0, sizeof(up)); |
11413 | if (copy_from_user(&up, arg, sizeof(struct io_uring_rsrc_update))) | |
11414 | return -EFAULT; | |
d8a3ba9c | 11415 | if (up.resv || up.resv2) |
565c5e61 | 11416 | return -EINVAL; |
c3bdad02 PB |
11417 | return __io_register_rsrc_update(ctx, IORING_RSRC_FILE, &up, nr_args); |
11418 | } | |
11419 | ||
11420 | static int io_register_rsrc_update(struct io_ring_ctx *ctx, void __user *arg, | |
992da01a | 11421 | unsigned size, unsigned type) |
c3bdad02 PB |
11422 | { |
11423 | struct io_uring_rsrc_update2 up; | |
11424 | ||
11425 | if (size != sizeof(up)) | |
11426 | return -EINVAL; | |
98f0b3b4 PB |
11427 | if (copy_from_user(&up, arg, sizeof(up))) |
11428 | return -EFAULT; | |
d8a3ba9c | 11429 | if (!up.nr || up.resv || up.resv2) |
98f0b3b4 | 11430 | return -EINVAL; |
992da01a | 11431 | return __io_register_rsrc_update(ctx, type, &up, up.nr); |
98f0b3b4 PB |
11432 | } |
11433 | ||
c072481d | 11434 | static __cold int io_register_rsrc(struct io_ring_ctx *ctx, void __user *arg, |
992da01a | 11435 | unsigned int size, unsigned int type) |
792e3582 PB |
11436 | { |
11437 | struct io_uring_rsrc_register rr; | |
11438 | ||
11439 | /* keep it extendible */ | |
11440 | if (size != sizeof(rr)) | |
11441 | return -EINVAL; | |
11442 | ||
11443 | memset(&rr, 0, sizeof(rr)); | |
11444 | if (copy_from_user(&rr, arg, size)) | |
11445 | return -EFAULT; | |
992da01a | 11446 | if (!rr.nr || rr.resv || rr.resv2) |
792e3582 PB |
11447 | return -EINVAL; |
11448 | ||
992da01a | 11449 | switch (type) { |
792e3582 PB |
11450 | case IORING_RSRC_FILE: |
11451 | return io_sqe_files_register(ctx, u64_to_user_ptr(rr.data), | |
11452 | rr.nr, u64_to_user_ptr(rr.tags)); | |
634d00df PB |
11453 | case IORING_RSRC_BUFFER: |
11454 | return io_sqe_buffers_register(ctx, u64_to_user_ptr(rr.data), | |
11455 | rr.nr, u64_to_user_ptr(rr.tags)); | |
792e3582 PB |
11456 | } |
11457 | return -EINVAL; | |
11458 | } | |
11459 | ||
c072481d PB |
11460 | static __cold int io_register_iowq_aff(struct io_ring_ctx *ctx, |
11461 | void __user *arg, unsigned len) | |
fe76421d JA |
11462 | { |
11463 | struct io_uring_task *tctx = current->io_uring; | |
11464 | cpumask_var_t new_mask; | |
11465 | int ret; | |
11466 | ||
11467 | if (!tctx || !tctx->io_wq) | |
11468 | return -EINVAL; | |
11469 | ||
11470 | if (!alloc_cpumask_var(&new_mask, GFP_KERNEL)) | |
11471 | return -ENOMEM; | |
11472 | ||
11473 | cpumask_clear(new_mask); | |
11474 | if (len > cpumask_size()) | |
11475 | len = cpumask_size(); | |
11476 | ||
0f5e4b83 ES |
11477 | if (in_compat_syscall()) { |
11478 | ret = compat_get_bitmap(cpumask_bits(new_mask), | |
11479 | (const compat_ulong_t __user *)arg, | |
11480 | len * 8 /* CHAR_BIT */); | |
11481 | } else { | |
11482 | ret = copy_from_user(new_mask, arg, len); | |
11483 | } | |
11484 | ||
11485 | if (ret) { | |
fe76421d JA |
11486 | free_cpumask_var(new_mask); |
11487 | return -EFAULT; | |
11488 | } | |
11489 | ||
11490 | ret = io_wq_cpu_affinity(tctx->io_wq, new_mask); | |
11491 | free_cpumask_var(new_mask); | |
11492 | return ret; | |
11493 | } | |
11494 | ||
c072481d | 11495 | static __cold int io_unregister_iowq_aff(struct io_ring_ctx *ctx) |
fe76421d JA |
11496 | { |
11497 | struct io_uring_task *tctx = current->io_uring; | |
11498 | ||
11499 | if (!tctx || !tctx->io_wq) | |
11500 | return -EINVAL; | |
11501 | ||
11502 | return io_wq_cpu_affinity(tctx->io_wq, NULL); | |
11503 | } | |
11504 | ||
c072481d PB |
11505 | static __cold int io_register_iowq_max_workers(struct io_ring_ctx *ctx, |
11506 | void __user *arg) | |
b22fa62a | 11507 | __must_hold(&ctx->uring_lock) |
2e480058 | 11508 | { |
b22fa62a | 11509 | struct io_tctx_node *node; |
fa84693b JA |
11510 | struct io_uring_task *tctx = NULL; |
11511 | struct io_sq_data *sqd = NULL; | |
2e480058 JA |
11512 | __u32 new_count[2]; |
11513 | int i, ret; | |
11514 | ||
2e480058 JA |
11515 | if (copy_from_user(new_count, arg, sizeof(new_count))) |
11516 | return -EFAULT; | |
11517 | for (i = 0; i < ARRAY_SIZE(new_count); i++) | |
11518 | if (new_count[i] > INT_MAX) | |
11519 | return -EINVAL; | |
11520 | ||
fa84693b JA |
11521 | if (ctx->flags & IORING_SETUP_SQPOLL) { |
11522 | sqd = ctx->sq_data; | |
11523 | if (sqd) { | |
009ad9f0 JA |
11524 | /* |
11525 | * Observe the correct sqd->lock -> ctx->uring_lock | |
11526 | * ordering. Fine to drop uring_lock here, we hold | |
11527 | * a ref to the ctx. | |
11528 | */ | |
41d3a6bd | 11529 | refcount_inc(&sqd->refs); |
009ad9f0 | 11530 | mutex_unlock(&ctx->uring_lock); |
fa84693b | 11531 | mutex_lock(&sqd->lock); |
009ad9f0 | 11532 | mutex_lock(&ctx->uring_lock); |
41d3a6bd JA |
11533 | if (sqd->thread) |
11534 | tctx = sqd->thread->io_uring; | |
fa84693b JA |
11535 | } |
11536 | } else { | |
11537 | tctx = current->io_uring; | |
11538 | } | |
11539 | ||
e139a1ec | 11540 | BUILD_BUG_ON(sizeof(new_count) != sizeof(ctx->iowq_limits)); |
fa84693b | 11541 | |
bad119b9 PB |
11542 | for (i = 0; i < ARRAY_SIZE(new_count); i++) |
11543 | if (new_count[i]) | |
11544 | ctx->iowq_limits[i] = new_count[i]; | |
e139a1ec PB |
11545 | ctx->iowq_limits_set = true; |
11546 | ||
e139a1ec PB |
11547 | if (tctx && tctx->io_wq) { |
11548 | ret = io_wq_max_workers(tctx->io_wq, new_count); | |
11549 | if (ret) | |
11550 | goto err; | |
11551 | } else { | |
11552 | memset(new_count, 0, sizeof(new_count)); | |
11553 | } | |
fa84693b | 11554 | |
41d3a6bd | 11555 | if (sqd) { |
fa84693b | 11556 | mutex_unlock(&sqd->lock); |
41d3a6bd JA |
11557 | io_put_sq_data(sqd); |
11558 | } | |
2e480058 JA |
11559 | |
11560 | if (copy_to_user(arg, new_count, sizeof(new_count))) | |
11561 | return -EFAULT; | |
11562 | ||
b22fa62a PB |
11563 | /* that's it for SQPOLL, only the SQPOLL task creates requests */ |
11564 | if (sqd) | |
11565 | return 0; | |
11566 | ||
11567 | /* now propagate the restriction to all registered users */ | |
11568 | list_for_each_entry(node, &ctx->tctx_list, ctx_node) { | |
11569 | struct io_uring_task *tctx = node->task->io_uring; | |
11570 | ||
11571 | if (WARN_ON_ONCE(!tctx->io_wq)) | |
11572 | continue; | |
11573 | ||
11574 | for (i = 0; i < ARRAY_SIZE(new_count); i++) | |
11575 | new_count[i] = ctx->iowq_limits[i]; | |
11576 | /* ignore errors, it always returns zero anyway */ | |
11577 | (void)io_wq_max_workers(tctx->io_wq, new_count); | |
11578 | } | |
2e480058 | 11579 | return 0; |
fa84693b | 11580 | err: |
41d3a6bd | 11581 | if (sqd) { |
fa84693b | 11582 | mutex_unlock(&sqd->lock); |
41d3a6bd JA |
11583 | io_put_sq_data(sqd); |
11584 | } | |
fa84693b | 11585 | return ret; |
2e480058 JA |
11586 | } |
11587 | ||
edafccee JA |
11588 | static int __io_uring_register(struct io_ring_ctx *ctx, unsigned opcode, |
11589 | void __user *arg, unsigned nr_args) | |
b19062a5 JA |
11590 | __releases(ctx->uring_lock) |
11591 | __acquires(ctx->uring_lock) | |
edafccee JA |
11592 | { |
11593 | int ret; | |
11594 | ||
35fa71a0 JA |
11595 | /* |
11596 | * We're inside the ring mutex, if the ref is already dying, then | |
11597 | * someone else killed the ctx or is already going through | |
11598 | * io_uring_register(). | |
11599 | */ | |
11600 | if (percpu_ref_is_dying(&ctx->refs)) | |
11601 | return -ENXIO; | |
11602 | ||
75c4021a PB |
11603 | if (ctx->restricted) { |
11604 | if (opcode >= IORING_REGISTER_LAST) | |
11605 | return -EINVAL; | |
11606 | opcode = array_index_nospec(opcode, IORING_REGISTER_LAST); | |
11607 | if (!test_bit(opcode, ctx->restrictions.register_op)) | |
11608 | return -EACCES; | |
11609 | } | |
11610 | ||
edafccee JA |
11611 | switch (opcode) { |
11612 | case IORING_REGISTER_BUFFERS: | |
634d00df | 11613 | ret = io_sqe_buffers_register(ctx, arg, nr_args, NULL); |
edafccee JA |
11614 | break; |
11615 | case IORING_UNREGISTER_BUFFERS: | |
11616 | ret = -EINVAL; | |
11617 | if (arg || nr_args) | |
11618 | break; | |
0a96bbe4 | 11619 | ret = io_sqe_buffers_unregister(ctx); |
edafccee | 11620 | break; |
6b06314c | 11621 | case IORING_REGISTER_FILES: |
792e3582 | 11622 | ret = io_sqe_files_register(ctx, arg, nr_args, NULL); |
6b06314c JA |
11623 | break; |
11624 | case IORING_UNREGISTER_FILES: | |
11625 | ret = -EINVAL; | |
11626 | if (arg || nr_args) | |
11627 | break; | |
11628 | ret = io_sqe_files_unregister(ctx); | |
11629 | break; | |
c3a31e60 | 11630 | case IORING_REGISTER_FILES_UPDATE: |
c3bdad02 | 11631 | ret = io_register_files_update(ctx, arg, nr_args); |
c3a31e60 | 11632 | break; |
9b402849 JA |
11633 | case IORING_REGISTER_EVENTFD: |
11634 | ret = -EINVAL; | |
11635 | if (nr_args != 1) | |
11636 | break; | |
c75312dd UA |
11637 | ret = io_eventfd_register(ctx, arg, 0); |
11638 | break; | |
11639 | case IORING_REGISTER_EVENTFD_ASYNC: | |
11640 | ret = -EINVAL; | |
11641 | if (nr_args != 1) | |
f2842ab5 | 11642 | break; |
c75312dd | 11643 | ret = io_eventfd_register(ctx, arg, 1); |
9b402849 JA |
11644 | break; |
11645 | case IORING_UNREGISTER_EVENTFD: | |
11646 | ret = -EINVAL; | |
11647 | if (arg || nr_args) | |
11648 | break; | |
11649 | ret = io_eventfd_unregister(ctx); | |
11650 | break; | |
66f4af93 JA |
11651 | case IORING_REGISTER_PROBE: |
11652 | ret = -EINVAL; | |
11653 | if (!arg || nr_args > 256) | |
11654 | break; | |
11655 | ret = io_probe(ctx, arg, nr_args); | |
11656 | break; | |
071698e1 JA |
11657 | case IORING_REGISTER_PERSONALITY: |
11658 | ret = -EINVAL; | |
11659 | if (arg || nr_args) | |
11660 | break; | |
11661 | ret = io_register_personality(ctx); | |
11662 | break; | |
11663 | case IORING_UNREGISTER_PERSONALITY: | |
11664 | ret = -EINVAL; | |
11665 | if (arg) | |
11666 | break; | |
11667 | ret = io_unregister_personality(ctx, nr_args); | |
11668 | break; | |
7e84e1c7 SG |
11669 | case IORING_REGISTER_ENABLE_RINGS: |
11670 | ret = -EINVAL; | |
11671 | if (arg || nr_args) | |
11672 | break; | |
11673 | ret = io_register_enable_rings(ctx); | |
11674 | break; | |
21b55dbc SG |
11675 | case IORING_REGISTER_RESTRICTIONS: |
11676 | ret = io_register_restrictions(ctx, arg, nr_args); | |
11677 | break; | |
992da01a PB |
11678 | case IORING_REGISTER_FILES2: |
11679 | ret = io_register_rsrc(ctx, arg, nr_args, IORING_RSRC_FILE); | |
11680 | break; | |
11681 | case IORING_REGISTER_FILES_UPDATE2: | |
11682 | ret = io_register_rsrc_update(ctx, arg, nr_args, | |
11683 | IORING_RSRC_FILE); | |
11684 | break; | |
11685 | case IORING_REGISTER_BUFFERS2: | |
11686 | ret = io_register_rsrc(ctx, arg, nr_args, IORING_RSRC_BUFFER); | |
792e3582 | 11687 | break; |
992da01a PB |
11688 | case IORING_REGISTER_BUFFERS_UPDATE: |
11689 | ret = io_register_rsrc_update(ctx, arg, nr_args, | |
11690 | IORING_RSRC_BUFFER); | |
c3bdad02 | 11691 | break; |
fe76421d JA |
11692 | case IORING_REGISTER_IOWQ_AFF: |
11693 | ret = -EINVAL; | |
11694 | if (!arg || !nr_args) | |
11695 | break; | |
11696 | ret = io_register_iowq_aff(ctx, arg, nr_args); | |
11697 | break; | |
11698 | case IORING_UNREGISTER_IOWQ_AFF: | |
11699 | ret = -EINVAL; | |
11700 | if (arg || nr_args) | |
11701 | break; | |
11702 | ret = io_unregister_iowq_aff(ctx); | |
11703 | break; | |
2e480058 JA |
11704 | case IORING_REGISTER_IOWQ_MAX_WORKERS: |
11705 | ret = -EINVAL; | |
11706 | if (!arg || nr_args != 2) | |
11707 | break; | |
11708 | ret = io_register_iowq_max_workers(ctx, arg); | |
11709 | break; | |
e7a6c00d JA |
11710 | case IORING_REGISTER_RING_FDS: |
11711 | ret = io_ringfd_register(ctx, arg, nr_args); | |
11712 | break; | |
11713 | case IORING_UNREGISTER_RING_FDS: | |
11714 | ret = io_ringfd_unregister(ctx, arg, nr_args); | |
11715 | break; | |
edafccee JA |
11716 | default: |
11717 | ret = -EINVAL; | |
11718 | break; | |
11719 | } | |
11720 | ||
edafccee JA |
11721 | return ret; |
11722 | } | |
11723 | ||
11724 | SYSCALL_DEFINE4(io_uring_register, unsigned int, fd, unsigned int, opcode, | |
11725 | void __user *, arg, unsigned int, nr_args) | |
11726 | { | |
11727 | struct io_ring_ctx *ctx; | |
11728 | long ret = -EBADF; | |
11729 | struct fd f; | |
11730 | ||
11731 | f = fdget(fd); | |
11732 | if (!f.file) | |
11733 | return -EBADF; | |
11734 | ||
11735 | ret = -EOPNOTSUPP; | |
11736 | if (f.file->f_op != &io_uring_fops) | |
11737 | goto out_fput; | |
11738 | ||
11739 | ctx = f.file->private_data; | |
11740 | ||
b6c23dd5 PB |
11741 | io_run_task_work(); |
11742 | ||
edafccee JA |
11743 | mutex_lock(&ctx->uring_lock); |
11744 | ret = __io_uring_register(ctx, opcode, arg, nr_args); | |
11745 | mutex_unlock(&ctx->uring_lock); | |
2757be22 | 11746 | trace_io_uring_register(ctx, opcode, ctx->nr_user_files, ctx->nr_user_bufs, ret); |
edafccee JA |
11747 | out_fput: |
11748 | fdput(f); | |
11749 | return ret; | |
11750 | } | |
11751 | ||
2b188cc1 JA |
11752 | static int __init io_uring_init(void) |
11753 | { | |
d7f62e82 SM |
11754 | #define __BUILD_BUG_VERIFY_ELEMENT(stype, eoffset, etype, ename) do { \ |
11755 | BUILD_BUG_ON(offsetof(stype, ename) != eoffset); \ | |
11756 | BUILD_BUG_ON(sizeof(etype) != sizeof_field(stype, ename)); \ | |
11757 | } while (0) | |
11758 | ||
11759 | #define BUILD_BUG_SQE_ELEM(eoffset, etype, ename) \ | |
11760 | __BUILD_BUG_VERIFY_ELEMENT(struct io_uring_sqe, eoffset, etype, ename) | |
11761 | BUILD_BUG_ON(sizeof(struct io_uring_sqe) != 64); | |
11762 | BUILD_BUG_SQE_ELEM(0, __u8, opcode); | |
11763 | BUILD_BUG_SQE_ELEM(1, __u8, flags); | |
11764 | BUILD_BUG_SQE_ELEM(2, __u16, ioprio); | |
11765 | BUILD_BUG_SQE_ELEM(4, __s32, fd); | |
11766 | BUILD_BUG_SQE_ELEM(8, __u64, off); | |
11767 | BUILD_BUG_SQE_ELEM(8, __u64, addr2); | |
11768 | BUILD_BUG_SQE_ELEM(16, __u64, addr); | |
7d67af2c | 11769 | BUILD_BUG_SQE_ELEM(16, __u64, splice_off_in); |
d7f62e82 SM |
11770 | BUILD_BUG_SQE_ELEM(24, __u32, len); |
11771 | BUILD_BUG_SQE_ELEM(28, __kernel_rwf_t, rw_flags); | |
11772 | BUILD_BUG_SQE_ELEM(28, /* compat */ int, rw_flags); | |
11773 | BUILD_BUG_SQE_ELEM(28, /* compat */ __u32, rw_flags); | |
11774 | BUILD_BUG_SQE_ELEM(28, __u32, fsync_flags); | |
5769a351 JX |
11775 | BUILD_BUG_SQE_ELEM(28, /* compat */ __u16, poll_events); |
11776 | BUILD_BUG_SQE_ELEM(28, __u32, poll32_events); | |
d7f62e82 SM |
11777 | BUILD_BUG_SQE_ELEM(28, __u32, sync_range_flags); |
11778 | BUILD_BUG_SQE_ELEM(28, __u32, msg_flags); | |
11779 | BUILD_BUG_SQE_ELEM(28, __u32, timeout_flags); | |
11780 | BUILD_BUG_SQE_ELEM(28, __u32, accept_flags); | |
11781 | BUILD_BUG_SQE_ELEM(28, __u32, cancel_flags); | |
11782 | BUILD_BUG_SQE_ELEM(28, __u32, open_flags); | |
11783 | BUILD_BUG_SQE_ELEM(28, __u32, statx_flags); | |
11784 | BUILD_BUG_SQE_ELEM(28, __u32, fadvise_advice); | |
7d67af2c | 11785 | BUILD_BUG_SQE_ELEM(28, __u32, splice_flags); |
d7f62e82 SM |
11786 | BUILD_BUG_SQE_ELEM(32, __u64, user_data); |
11787 | BUILD_BUG_SQE_ELEM(40, __u16, buf_index); | |
16340eab | 11788 | BUILD_BUG_SQE_ELEM(40, __u16, buf_group); |
d7f62e82 | 11789 | BUILD_BUG_SQE_ELEM(42, __u16, personality); |
7d67af2c | 11790 | BUILD_BUG_SQE_ELEM(44, __s32, splice_fd_in); |
b9445598 | 11791 | BUILD_BUG_SQE_ELEM(44, __u32, file_index); |
d7f62e82 | 11792 | |
b0d658ec PB |
11793 | BUILD_BUG_ON(sizeof(struct io_uring_files_update) != |
11794 | sizeof(struct io_uring_rsrc_update)); | |
11795 | BUILD_BUG_ON(sizeof(struct io_uring_rsrc_update) > | |
11796 | sizeof(struct io_uring_rsrc_update2)); | |
90499ad0 PB |
11797 | |
11798 | /* ->buf_index is u16 */ | |
11799 | BUILD_BUG_ON(IORING_MAX_REG_BUFFERS >= (1u << 16)); | |
11800 | ||
b0d658ec PB |
11801 | /* should fit into one byte */ |
11802 | BUILD_BUG_ON(SQE_VALID_FLAGS >= (1 << 8)); | |
68fe256a PB |
11803 | BUILD_BUG_ON(SQE_COMMON_FLAGS >= (1 << 8)); |
11804 | BUILD_BUG_ON((SQE_VALID_FLAGS | SQE_COMMON_FLAGS) != SQE_VALID_FLAGS); | |
b0d658ec | 11805 | |
d3656344 | 11806 | BUILD_BUG_ON(ARRAY_SIZE(io_op_defs) != IORING_OP_LAST); |
32c2d33e | 11807 | BUILD_BUG_ON(__REQ_F_LAST_BIT > 8 * sizeof(int)); |
16340eab | 11808 | |
91f245d5 JA |
11809 | req_cachep = KMEM_CACHE(io_kiocb, SLAB_HWCACHE_ALIGN | SLAB_PANIC | |
11810 | SLAB_ACCOUNT); | |
2b188cc1 JA |
11811 | return 0; |
11812 | }; | |
11813 | __initcall(io_uring_init); |