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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> | |
2b188cc1 | 60 | #include <linux/blkdev.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> |
ef98eb04 | 81 | #include <linux/tracehook.h> |
2b188cc1 | 82 | |
c826bd7a DD |
83 | #define CREATE_TRACE_POINTS |
84 | #include <trace/events/io_uring.h> | |
85 | ||
2b188cc1 JA |
86 | #include <uapi/linux/io_uring.h> |
87 | ||
88 | #include "internal.h" | |
561fb04a | 89 | #include "io-wq.h" |
2b188cc1 | 90 | |
5277deaa | 91 | #define IORING_MAX_ENTRIES 32768 |
33a107f0 | 92 | #define IORING_MAX_CQ_ENTRIES (2 * IORING_MAX_ENTRIES) |
4ce8ad95 | 93 | #define IORING_SQPOLL_CAP_ENTRIES_VALUE 8 |
65e19f54 | 94 | |
042b0d85 PB |
95 | /* 512 entries per page on 64-bit archs, 64 pages max */ |
96 | #define IORING_MAX_FIXED_FILES (1U << 15) | |
21b55dbc SG |
97 | #define IORING_MAX_RESTRICTIONS (IORING_RESTRICTION_LAST + \ |
98 | IORING_REGISTER_LAST + IORING_OP_LAST) | |
2b188cc1 | 99 | |
2d091d62 PB |
100 | #define IO_RSRC_TAG_TABLE_SHIFT 9 |
101 | #define IO_RSRC_TAG_TABLE_MAX (1U << IO_RSRC_TAG_TABLE_SHIFT) | |
102 | #define IO_RSRC_TAG_TABLE_MASK (IO_RSRC_TAG_TABLE_MAX - 1) | |
103 | ||
489809e2 PB |
104 | #define IORING_MAX_REG_BUFFERS (1U << 14) |
105 | ||
b16fed66 PB |
106 | #define SQE_VALID_FLAGS (IOSQE_FIXED_FILE|IOSQE_IO_DRAIN|IOSQE_IO_LINK| \ |
107 | IOSQE_IO_HARDLINK | IOSQE_ASYNC | \ | |
108 | IOSQE_BUFFER_SELECT) | |
c854357b PB |
109 | #define IO_REQ_CLEAN_FLAGS (REQ_F_BUFFER_SELECTED | REQ_F_NEED_CLEANUP | \ |
110 | REQ_F_POLLED | REQ_F_INFLIGHT | REQ_F_CREDS) | |
b16fed66 | 111 | |
09899b19 PB |
112 | #define IO_TCTX_REFS_CACHE_NR (1U << 10) |
113 | ||
2b188cc1 JA |
114 | struct io_uring { |
115 | u32 head ____cacheline_aligned_in_smp; | |
116 | u32 tail ____cacheline_aligned_in_smp; | |
117 | }; | |
118 | ||
1e84b97b | 119 | /* |
75b28aff HV |
120 | * This data is shared with the application through the mmap at offsets |
121 | * IORING_OFF_SQ_RING and IORING_OFF_CQ_RING. | |
1e84b97b SB |
122 | * |
123 | * The offsets to the member fields are published through struct | |
124 | * io_sqring_offsets when calling io_uring_setup. | |
125 | */ | |
75b28aff | 126 | struct io_rings { |
1e84b97b SB |
127 | /* |
128 | * Head and tail offsets into the ring; the offsets need to be | |
129 | * masked to get valid indices. | |
130 | * | |
75b28aff HV |
131 | * The kernel controls head of the sq ring and the tail of the cq ring, |
132 | * and the application controls tail of the sq ring and the head of the | |
133 | * cq ring. | |
1e84b97b | 134 | */ |
75b28aff | 135 | struct io_uring sq, cq; |
1e84b97b | 136 | /* |
75b28aff | 137 | * Bitmasks to apply to head and tail offsets (constant, equals |
1e84b97b SB |
138 | * ring_entries - 1) |
139 | */ | |
75b28aff HV |
140 | u32 sq_ring_mask, cq_ring_mask; |
141 | /* Ring sizes (constant, power of 2) */ | |
142 | u32 sq_ring_entries, cq_ring_entries; | |
1e84b97b SB |
143 | /* |
144 | * Number of invalid entries dropped by the kernel due to | |
145 | * invalid index stored in array | |
146 | * | |
147 | * Written by the kernel, shouldn't be modified by the | |
148 | * application (i.e. get number of "new events" by comparing to | |
149 | * cached value). | |
150 | * | |
151 | * After a new SQ head value was read by the application this | |
152 | * counter includes all submissions that were dropped reaching | |
153 | * the new SQ head (and possibly more). | |
154 | */ | |
75b28aff | 155 | u32 sq_dropped; |
1e84b97b | 156 | /* |
0d9b5b3a | 157 | * Runtime SQ flags |
1e84b97b SB |
158 | * |
159 | * Written by the kernel, shouldn't be modified by the | |
160 | * application. | |
161 | * | |
162 | * The application needs a full memory barrier before checking | |
163 | * for IORING_SQ_NEED_WAKEUP after updating the sq tail. | |
164 | */ | |
75b28aff | 165 | u32 sq_flags; |
0d9b5b3a SG |
166 | /* |
167 | * Runtime CQ flags | |
168 | * | |
169 | * Written by the application, shouldn't be modified by the | |
170 | * kernel. | |
171 | */ | |
fe7e3257 | 172 | u32 cq_flags; |
1e84b97b SB |
173 | /* |
174 | * Number of completion events lost because the queue was full; | |
175 | * this should be avoided by the application by making sure | |
0b4295b5 | 176 | * there are not more requests pending than there is space in |
1e84b97b SB |
177 | * the completion queue. |
178 | * | |
179 | * Written by the kernel, shouldn't be modified by the | |
180 | * application (i.e. get number of "new events" by comparing to | |
181 | * cached value). | |
182 | * | |
183 | * As completion events come in out of order this counter is not | |
184 | * ordered with any other data. | |
185 | */ | |
75b28aff | 186 | u32 cq_overflow; |
1e84b97b SB |
187 | /* |
188 | * Ring buffer of completion events. | |
189 | * | |
190 | * The kernel writes completion events fresh every time they are | |
191 | * produced, so the application is allowed to modify pending | |
192 | * entries. | |
193 | */ | |
75b28aff | 194 | struct io_uring_cqe cqes[] ____cacheline_aligned_in_smp; |
2b188cc1 JA |
195 | }; |
196 | ||
45d189c6 PB |
197 | enum io_uring_cmd_flags { |
198 | IO_URING_F_NONBLOCK = 1, | |
889fca73 | 199 | IO_URING_F_COMPLETE_DEFER = 2, |
45d189c6 PB |
200 | }; |
201 | ||
edafccee JA |
202 | struct io_mapped_ubuf { |
203 | u64 ubuf; | |
4751f53d | 204 | u64 ubuf_end; |
edafccee | 205 | unsigned int nr_bvecs; |
de293938 | 206 | unsigned long acct_pages; |
41edf1a5 | 207 | struct bio_vec bvec[]; |
edafccee JA |
208 | }; |
209 | ||
50238531 BM |
210 | struct io_ring_ctx; |
211 | ||
6c2450ae PB |
212 | struct io_overflow_cqe { |
213 | struct io_uring_cqe cqe; | |
214 | struct list_head list; | |
215 | }; | |
216 | ||
a04b0ac0 PB |
217 | struct io_fixed_file { |
218 | /* file * with additional FFS_* flags */ | |
219 | unsigned long file_ptr; | |
220 | }; | |
221 | ||
269bbe5f BM |
222 | struct io_rsrc_put { |
223 | struct list_head list; | |
b60c8dce | 224 | u64 tag; |
50238531 BM |
225 | union { |
226 | void *rsrc; | |
227 | struct file *file; | |
bd54b6fe | 228 | struct io_mapped_ubuf *buf; |
50238531 | 229 | }; |
269bbe5f BM |
230 | }; |
231 | ||
aeca241b | 232 | struct io_file_table { |
042b0d85 | 233 | struct io_fixed_file *files; |
31b51510 JA |
234 | }; |
235 | ||
b895c9a6 | 236 | struct io_rsrc_node { |
05589553 XW |
237 | struct percpu_ref refs; |
238 | struct list_head node; | |
269bbe5f | 239 | struct list_head rsrc_list; |
b895c9a6 | 240 | struct io_rsrc_data *rsrc_data; |
4a38aed2 | 241 | struct llist_node llist; |
e297822b | 242 | bool done; |
05589553 XW |
243 | }; |
244 | ||
40ae0ff7 PB |
245 | typedef void (rsrc_put_fn)(struct io_ring_ctx *ctx, struct io_rsrc_put *prsrc); |
246 | ||
b895c9a6 | 247 | struct io_rsrc_data { |
05f3fb3c JA |
248 | struct io_ring_ctx *ctx; |
249 | ||
2d091d62 PB |
250 | u64 **tags; |
251 | unsigned int nr; | |
40ae0ff7 | 252 | rsrc_put_fn *do_put; |
3e942498 | 253 | atomic_t refs; |
05f3fb3c | 254 | struct completion done; |
8bad28d8 | 255 | bool quiesce; |
05f3fb3c JA |
256 | }; |
257 | ||
5a2e745d JA |
258 | struct io_buffer { |
259 | struct list_head list; | |
260 | __u64 addr; | |
d1f82808 | 261 | __u32 len; |
5a2e745d JA |
262 | __u16 bid; |
263 | }; | |
264 | ||
21b55dbc SG |
265 | struct io_restriction { |
266 | DECLARE_BITMAP(register_op, IORING_REGISTER_LAST); | |
267 | DECLARE_BITMAP(sqe_op, IORING_OP_LAST); | |
268 | u8 sqe_flags_allowed; | |
269 | u8 sqe_flags_required; | |
7e84e1c7 | 270 | bool registered; |
21b55dbc SG |
271 | }; |
272 | ||
37d1e2e3 JA |
273 | enum { |
274 | IO_SQ_THREAD_SHOULD_STOP = 0, | |
275 | IO_SQ_THREAD_SHOULD_PARK, | |
276 | }; | |
277 | ||
534ca6d6 JA |
278 | struct io_sq_data { |
279 | refcount_t refs; | |
9e138a48 | 280 | atomic_t park_pending; |
09a6f4ef | 281 | struct mutex lock; |
69fb2131 JA |
282 | |
283 | /* ctx's that are using this sqd */ | |
284 | struct list_head ctx_list; | |
69fb2131 | 285 | |
534ca6d6 JA |
286 | struct task_struct *thread; |
287 | struct wait_queue_head wait; | |
08369246 XW |
288 | |
289 | unsigned sq_thread_idle; | |
37d1e2e3 JA |
290 | int sq_cpu; |
291 | pid_t task_pid; | |
5c2469e0 | 292 | pid_t task_tgid; |
37d1e2e3 JA |
293 | |
294 | unsigned long state; | |
37d1e2e3 | 295 | struct completion exited; |
534ca6d6 JA |
296 | }; |
297 | ||
6dd0be1e | 298 | #define IO_COMPL_BATCH 32 |
6ff119a6 | 299 | #define IO_REQ_CACHE_SIZE 32 |
bf019da7 | 300 | #define IO_REQ_ALLOC_BATCH 8 |
258b29a9 PB |
301 | |
302 | struct io_comp_state { | |
6dd0be1e | 303 | struct io_kiocb *reqs[IO_COMPL_BATCH]; |
1b4c351f | 304 | unsigned int nr; |
c7dae4ba | 305 | /* inline/task_work completion list, under ->uring_lock */ |
1b4c351f | 306 | struct list_head free_list; |
258b29a9 PB |
307 | }; |
308 | ||
a1ab7b35 PB |
309 | struct io_submit_link { |
310 | struct io_kiocb *head; | |
311 | struct io_kiocb *last; | |
312 | }; | |
313 | ||
258b29a9 PB |
314 | struct io_submit_state { |
315 | struct blk_plug plug; | |
a1ab7b35 | 316 | struct io_submit_link link; |
258b29a9 PB |
317 | |
318 | /* | |
319 | * io_kiocb alloc cache | |
320 | */ | |
bf019da7 | 321 | void *reqs[IO_REQ_CACHE_SIZE]; |
258b29a9 PB |
322 | unsigned int free_reqs; |
323 | ||
324 | bool plug_started; | |
325 | ||
326 | /* | |
327 | * Batch completion logic | |
328 | */ | |
329 | struct io_comp_state comp; | |
330 | ||
331 | /* | |
332 | * File reference cache | |
333 | */ | |
334 | struct file *file; | |
335 | unsigned int fd; | |
336 | unsigned int file_refs; | |
337 | unsigned int ios_left; | |
338 | }; | |
339 | ||
2b188cc1 | 340 | struct io_ring_ctx { |
b52ecf8c | 341 | /* const or read-mostly hot data */ |
2b188cc1 JA |
342 | struct { |
343 | struct percpu_ref refs; | |
2b188cc1 | 344 | |
b52ecf8c | 345 | struct io_rings *rings; |
2b188cc1 | 346 | unsigned int flags; |
e1d85334 | 347 | unsigned int compat: 1; |
e1d85334 RD |
348 | unsigned int drain_next: 1; |
349 | unsigned int eventfd_async: 1; | |
21b55dbc | 350 | unsigned int restricted: 1; |
f18ee4cf | 351 | unsigned int off_timeout_used: 1; |
10c66904 | 352 | unsigned int drain_active: 1; |
b52ecf8c | 353 | } ____cacheline_aligned_in_smp; |
2b188cc1 | 354 | |
7f1129d2 | 355 | /* submission data */ |
b52ecf8c | 356 | struct { |
0499e582 PB |
357 | struct mutex uring_lock; |
358 | ||
75b28aff HV |
359 | /* |
360 | * Ring buffer of indices into array of io_uring_sqe, which is | |
361 | * mmapped by the application using the IORING_OFF_SQES offset. | |
362 | * | |
363 | * This indirection could e.g. be used to assign fixed | |
364 | * io_uring_sqe entries to operations and only submit them to | |
365 | * the queue when needed. | |
366 | * | |
367 | * The kernel modifies neither the indices array nor the entries | |
368 | * array. | |
369 | */ | |
370 | u32 *sq_array; | |
c7af47cf | 371 | struct io_uring_sqe *sq_sqes; |
2b188cc1 JA |
372 | unsigned cached_sq_head; |
373 | unsigned sq_entries; | |
de0617e4 | 374 | struct list_head defer_list; |
7f1129d2 PB |
375 | |
376 | /* | |
377 | * Fixed resources fast path, should be accessed only under | |
378 | * uring_lock, and updated through io_uring_register(2) | |
379 | */ | |
380 | struct io_rsrc_node *rsrc_node; | |
381 | struct io_file_table file_table; | |
382 | unsigned nr_user_files; | |
383 | unsigned nr_user_bufs; | |
384 | struct io_mapped_ubuf **user_bufs; | |
385 | ||
386 | struct io_submit_state submit_state; | |
5262f567 | 387 | struct list_head timeout_list; |
1d7bb1d5 | 388 | struct list_head cq_overflow_list; |
7f1129d2 PB |
389 | struct xarray io_buffers; |
390 | struct xarray personalities; | |
391 | u32 pers_next; | |
392 | unsigned sq_thread_idle; | |
2b188cc1 JA |
393 | } ____cacheline_aligned_in_smp; |
394 | ||
d0acdee2 PB |
395 | /* IRQ completion list, under ->completion_lock */ |
396 | struct list_head locked_free_list; | |
397 | unsigned int locked_free_nr; | |
3c1a2ead | 398 | |
7c30f36a | 399 | const struct cred *sq_creds; /* cred used for __io_sq_thread() */ |
534ca6d6 JA |
400 | struct io_sq_data *sq_data; /* if using sq thread polling */ |
401 | ||
90554200 | 402 | struct wait_queue_head sqo_sq_wait; |
69fb2131 | 403 | struct list_head sqd_list; |
75b28aff | 404 | |
5ed7a37d PB |
405 | unsigned long check_cq_overflow; |
406 | ||
206aefde JA |
407 | struct { |
408 | unsigned cached_cq_tail; | |
409 | unsigned cq_entries; | |
0499e582 | 410 | struct eventfd_ctx *cq_ev_fd; |
311997b3 | 411 | struct wait_queue_head poll_wait; |
0499e582 PB |
412 | struct wait_queue_head cq_wait; |
413 | unsigned cq_extra; | |
414 | atomic_t cq_timeouts; | |
206aefde | 415 | struct fasync_struct *cq_fasync; |
0499e582 | 416 | unsigned cq_last_tm_flush; |
206aefde | 417 | } ____cacheline_aligned_in_smp; |
2b188cc1 | 418 | |
2b188cc1 JA |
419 | struct { |
420 | spinlock_t completion_lock; | |
e94f141b | 421 | |
def596e9 | 422 | /* |
540e32a0 | 423 | * ->iopoll_list is protected by the ctx->uring_lock for |
def596e9 JA |
424 | * io_uring instances that don't use IORING_SETUP_SQPOLL. |
425 | * For SQPOLL, only the single threaded io_sq_thread() will | |
426 | * manipulate the list, hence no extra locking is needed there. | |
427 | */ | |
540e32a0 | 428 | struct list_head iopoll_list; |
78076bb6 JA |
429 | struct hlist_head *cancel_hash; |
430 | unsigned cancel_hash_bits; | |
915b3dde | 431 | bool poll_multi_queue; |
2b188cc1 | 432 | } ____cacheline_aligned_in_smp; |
85faa7b8 | 433 | |
21b55dbc | 434 | struct io_restriction restrictions; |
3c1a2ead | 435 | |
b13a8918 PB |
436 | /* slow path rsrc auxilary data, used by update/register */ |
437 | struct { | |
438 | struct io_rsrc_node *rsrc_backup_node; | |
439 | struct io_mapped_ubuf *dummy_ubuf; | |
440 | struct io_rsrc_data *file_data; | |
441 | struct io_rsrc_data *buf_data; | |
442 | ||
443 | struct delayed_work rsrc_put_work; | |
444 | struct llist_head rsrc_put_llist; | |
445 | struct list_head rsrc_ref_list; | |
446 | spinlock_t rsrc_ref_lock; | |
447 | }; | |
448 | ||
3c1a2ead | 449 | /* Keep this last, we don't need it for the fast path */ |
b986af7e PB |
450 | struct { |
451 | #if defined(CONFIG_UNIX) | |
452 | struct socket *ring_sock; | |
453 | #endif | |
454 | /* hashed buffered write serialization */ | |
455 | struct io_wq_hash *hash_map; | |
456 | ||
457 | /* Only used for accounting purposes */ | |
458 | struct user_struct *user; | |
459 | struct mm_struct *mm_account; | |
460 | ||
461 | /* ctx exit and cancelation */ | |
9011bf9a PB |
462 | struct llist_head fallback_llist; |
463 | struct delayed_work fallback_work; | |
b986af7e PB |
464 | struct work_struct exit_work; |
465 | struct list_head tctx_list; | |
466 | struct completion ref_comp; | |
467 | }; | |
2b188cc1 JA |
468 | }; |
469 | ||
53e043b2 SM |
470 | struct io_uring_task { |
471 | /* submission side */ | |
09899b19 | 472 | int cached_refs; |
53e043b2 SM |
473 | struct xarray xa; |
474 | struct wait_queue_head wait; | |
ee53fb2b SM |
475 | const struct io_ring_ctx *last; |
476 | struct io_wq *io_wq; | |
53e043b2 | 477 | struct percpu_counter inflight; |
b303fe2e | 478 | atomic_t inflight_tracked; |
53e043b2 | 479 | atomic_t in_idle; |
53e043b2 SM |
480 | |
481 | spinlock_t task_lock; | |
482 | struct io_wq_work_list task_list; | |
483 | unsigned long task_state; | |
484 | struct callback_head task_work; | |
485 | }; | |
486 | ||
09bb8394 JA |
487 | /* |
488 | * First field must be the file pointer in all the | |
489 | * iocb unions! See also 'struct kiocb' in <linux/fs.h> | |
490 | */ | |
221c5eb2 JA |
491 | struct io_poll_iocb { |
492 | struct file *file; | |
018043be | 493 | struct wait_queue_head *head; |
221c5eb2 | 494 | __poll_t events; |
8c838788 | 495 | bool done; |
221c5eb2 | 496 | bool canceled; |
392edb45 | 497 | struct wait_queue_entry wait; |
221c5eb2 JA |
498 | }; |
499 | ||
9d805892 | 500 | struct io_poll_update { |
018043be | 501 | struct file *file; |
9d805892 PB |
502 | u64 old_user_data; |
503 | u64 new_user_data; | |
504 | __poll_t events; | |
b69de288 JA |
505 | bool update_events; |
506 | bool update_user_data; | |
018043be PB |
507 | }; |
508 | ||
b5dba59e JA |
509 | struct io_close { |
510 | struct file *file; | |
b5dba59e JA |
511 | int fd; |
512 | }; | |
513 | ||
ad8a48ac JA |
514 | struct io_timeout_data { |
515 | struct io_kiocb *req; | |
516 | struct hrtimer timer; | |
517 | struct timespec64 ts; | |
518 | enum hrtimer_mode mode; | |
519 | }; | |
520 | ||
8ed8d3c3 JA |
521 | struct io_accept { |
522 | struct file *file; | |
523 | struct sockaddr __user *addr; | |
524 | int __user *addr_len; | |
525 | int flags; | |
09952e3e | 526 | unsigned long nofile; |
8ed8d3c3 JA |
527 | }; |
528 | ||
529 | struct io_sync { | |
530 | struct file *file; | |
531 | loff_t len; | |
532 | loff_t off; | |
533 | int flags; | |
d63d1b5e | 534 | int mode; |
8ed8d3c3 JA |
535 | }; |
536 | ||
fbf23849 JA |
537 | struct io_cancel { |
538 | struct file *file; | |
539 | u64 addr; | |
540 | }; | |
541 | ||
b29472ee JA |
542 | struct io_timeout { |
543 | struct file *file; | |
bfe68a22 PB |
544 | u32 off; |
545 | u32 target_seq; | |
135fcde8 | 546 | struct list_head list; |
90cd7e42 PB |
547 | /* head of the link, used by linked timeouts only */ |
548 | struct io_kiocb *head; | |
b29472ee JA |
549 | }; |
550 | ||
0bdf7a2d PB |
551 | struct io_timeout_rem { |
552 | struct file *file; | |
553 | u64 addr; | |
9c8e11b3 PB |
554 | |
555 | /* timeout update */ | |
556 | struct timespec64 ts; | |
557 | u32 flags; | |
0bdf7a2d PB |
558 | }; |
559 | ||
9adbd45d JA |
560 | struct io_rw { |
561 | /* NOTE: kiocb has the file as the first member, so don't do it here */ | |
562 | struct kiocb kiocb; | |
563 | u64 addr; | |
564 | u64 len; | |
565 | }; | |
566 | ||
3fbb51c1 JA |
567 | struct io_connect { |
568 | struct file *file; | |
569 | struct sockaddr __user *addr; | |
570 | int addr_len; | |
571 | }; | |
572 | ||
e47293fd JA |
573 | struct io_sr_msg { |
574 | struct file *file; | |
fddaface | 575 | union { |
4af3417a PB |
576 | struct compat_msghdr __user *umsg_compat; |
577 | struct user_msghdr __user *umsg; | |
578 | void __user *buf; | |
fddaface | 579 | }; |
e47293fd | 580 | int msg_flags; |
bcda7baa | 581 | int bgid; |
fddaface | 582 | size_t len; |
bcda7baa | 583 | struct io_buffer *kbuf; |
e47293fd JA |
584 | }; |
585 | ||
15b71abe JA |
586 | struct io_open { |
587 | struct file *file; | |
588 | int dfd; | |
15b71abe | 589 | struct filename *filename; |
c12cedf2 | 590 | struct open_how how; |
4022e7af | 591 | unsigned long nofile; |
15b71abe JA |
592 | }; |
593 | ||
269bbe5f | 594 | struct io_rsrc_update { |
05f3fb3c JA |
595 | struct file *file; |
596 | u64 arg; | |
597 | u32 nr_args; | |
598 | u32 offset; | |
599 | }; | |
600 | ||
4840e418 JA |
601 | struct io_fadvise { |
602 | struct file *file; | |
603 | u64 offset; | |
604 | u32 len; | |
605 | u32 advice; | |
606 | }; | |
607 | ||
c1ca757b JA |
608 | struct io_madvise { |
609 | struct file *file; | |
610 | u64 addr; | |
611 | u32 len; | |
612 | u32 advice; | |
613 | }; | |
614 | ||
3e4827b0 JA |
615 | struct io_epoll { |
616 | struct file *file; | |
617 | int epfd; | |
618 | int op; | |
619 | int fd; | |
620 | struct epoll_event event; | |
e47293fd JA |
621 | }; |
622 | ||
7d67af2c PB |
623 | struct io_splice { |
624 | struct file *file_out; | |
625 | struct file *file_in; | |
626 | loff_t off_out; | |
627 | loff_t off_in; | |
628 | u64 len; | |
629 | unsigned int flags; | |
630 | }; | |
631 | ||
ddf0322d JA |
632 | struct io_provide_buf { |
633 | struct file *file; | |
634 | __u64 addr; | |
38134ada | 635 | __u32 len; |
ddf0322d JA |
636 | __u32 bgid; |
637 | __u16 nbufs; | |
638 | __u16 bid; | |
639 | }; | |
640 | ||
1d9e1288 BM |
641 | struct io_statx { |
642 | struct file *file; | |
643 | int dfd; | |
644 | unsigned int mask; | |
645 | unsigned int flags; | |
e62753e4 | 646 | const char __user *filename; |
1d9e1288 BM |
647 | struct statx __user *buffer; |
648 | }; | |
649 | ||
36f4fa68 JA |
650 | struct io_shutdown { |
651 | struct file *file; | |
652 | int how; | |
653 | }; | |
654 | ||
80a261fd JA |
655 | struct io_rename { |
656 | struct file *file; | |
657 | int old_dfd; | |
658 | int new_dfd; | |
659 | struct filename *oldpath; | |
660 | struct filename *newpath; | |
661 | int flags; | |
662 | }; | |
663 | ||
14a1143b JA |
664 | struct io_unlink { |
665 | struct file *file; | |
666 | int dfd; | |
667 | int flags; | |
668 | struct filename *filename; | |
669 | }; | |
670 | ||
3ca405eb PB |
671 | struct io_completion { |
672 | struct file *file; | |
673 | struct list_head list; | |
8c3f9cd1 | 674 | u32 cflags; |
3ca405eb PB |
675 | }; |
676 | ||
f499a021 JA |
677 | struct io_async_connect { |
678 | struct sockaddr_storage address; | |
679 | }; | |
680 | ||
03b1230c JA |
681 | struct io_async_msghdr { |
682 | struct iovec fast_iov[UIO_FASTIOV]; | |
257e84a5 PB |
683 | /* points to an allocated iov, if NULL we use fast_iov instead */ |
684 | struct iovec *free_iov; | |
03b1230c JA |
685 | struct sockaddr __user *uaddr; |
686 | struct msghdr msg; | |
b537916c | 687 | struct sockaddr_storage addr; |
03b1230c JA |
688 | }; |
689 | ||
f67676d1 JA |
690 | struct io_async_rw { |
691 | struct iovec fast_iov[UIO_FASTIOV]; | |
ff6165b2 JA |
692 | const struct iovec *free_iovec; |
693 | struct iov_iter iter; | |
227c0c96 | 694 | size_t bytes_done; |
bcf5a063 | 695 | struct wait_page_queue wpq; |
f67676d1 JA |
696 | }; |
697 | ||
6b47ee6e PB |
698 | enum { |
699 | REQ_F_FIXED_FILE_BIT = IOSQE_FIXED_FILE_BIT, | |
700 | REQ_F_IO_DRAIN_BIT = IOSQE_IO_DRAIN_BIT, | |
701 | REQ_F_LINK_BIT = IOSQE_IO_LINK_BIT, | |
702 | REQ_F_HARDLINK_BIT = IOSQE_IO_HARDLINK_BIT, | |
703 | REQ_F_FORCE_ASYNC_BIT = IOSQE_ASYNC_BIT, | |
bcda7baa | 704 | REQ_F_BUFFER_SELECT_BIT = IOSQE_BUFFER_SELECT_BIT, |
6b47ee6e | 705 | |
dddca226 | 706 | /* first byte is taken by user flags, shift it to not overlap */ |
93d2bcd2 | 707 | REQ_F_FAIL_BIT = 8, |
6b47ee6e PB |
708 | REQ_F_INFLIGHT_BIT, |
709 | REQ_F_CUR_POS_BIT, | |
710 | REQ_F_NOWAIT_BIT, | |
6b47ee6e | 711 | REQ_F_LINK_TIMEOUT_BIT, |
99bc4c38 | 712 | REQ_F_NEED_CLEANUP_BIT, |
d7718a9d | 713 | REQ_F_POLLED_BIT, |
bcda7baa | 714 | REQ_F_BUFFER_SELECTED_BIT, |
900fad45 | 715 | REQ_F_LTIMEOUT_ACTIVE_BIT, |
e342c807 | 716 | REQ_F_COMPLETE_INLINE_BIT, |
230d50d4 | 717 | REQ_F_REISSUE_BIT, |
8c130827 | 718 | REQ_F_DONT_REISSUE_BIT, |
b8e64b53 | 719 | REQ_F_CREDS_BIT, |
7b29f92d | 720 | /* keep async read/write and isreg together and in order */ |
b191e2df PB |
721 | REQ_F_NOWAIT_READ_BIT, |
722 | REQ_F_NOWAIT_WRITE_BIT, | |
7b29f92d | 723 | REQ_F_ISREG_BIT, |
84557871 JA |
724 | |
725 | /* not a real bit, just to check we're not overflowing the space */ | |
726 | __REQ_F_LAST_BIT, | |
6b47ee6e PB |
727 | }; |
728 | ||
729 | enum { | |
730 | /* ctx owns file */ | |
731 | REQ_F_FIXED_FILE = BIT(REQ_F_FIXED_FILE_BIT), | |
732 | /* drain existing IO first */ | |
733 | REQ_F_IO_DRAIN = BIT(REQ_F_IO_DRAIN_BIT), | |
734 | /* linked sqes */ | |
735 | REQ_F_LINK = BIT(REQ_F_LINK_BIT), | |
736 | /* doesn't sever on completion < 0 */ | |
737 | REQ_F_HARDLINK = BIT(REQ_F_HARDLINK_BIT), | |
738 | /* IOSQE_ASYNC */ | |
739 | REQ_F_FORCE_ASYNC = BIT(REQ_F_FORCE_ASYNC_BIT), | |
bcda7baa JA |
740 | /* IOSQE_BUFFER_SELECT */ |
741 | REQ_F_BUFFER_SELECT = BIT(REQ_F_BUFFER_SELECT_BIT), | |
6b47ee6e | 742 | |
6b47ee6e | 743 | /* fail rest of links */ |
93d2bcd2 | 744 | REQ_F_FAIL = BIT(REQ_F_FAIL_BIT), |
b05a1bcd | 745 | /* on inflight list, should be cancelled and waited on exit reliably */ |
6b47ee6e PB |
746 | REQ_F_INFLIGHT = BIT(REQ_F_INFLIGHT_BIT), |
747 | /* read/write uses file position */ | |
748 | REQ_F_CUR_POS = BIT(REQ_F_CUR_POS_BIT), | |
749 | /* must not punt to workers */ | |
750 | REQ_F_NOWAIT = BIT(REQ_F_NOWAIT_BIT), | |
900fad45 | 751 | /* has or had linked timeout */ |
6b47ee6e | 752 | REQ_F_LINK_TIMEOUT = BIT(REQ_F_LINK_TIMEOUT_BIT), |
99bc4c38 PB |
753 | /* needs cleanup */ |
754 | REQ_F_NEED_CLEANUP = BIT(REQ_F_NEED_CLEANUP_BIT), | |
d7718a9d JA |
755 | /* already went through poll handler */ |
756 | REQ_F_POLLED = BIT(REQ_F_POLLED_BIT), | |
bcda7baa JA |
757 | /* buffer already selected */ |
758 | REQ_F_BUFFER_SELECTED = BIT(REQ_F_BUFFER_SELECTED_BIT), | |
900fad45 PB |
759 | /* linked timeout is active, i.e. prepared by link's head */ |
760 | REQ_F_LTIMEOUT_ACTIVE = BIT(REQ_F_LTIMEOUT_ACTIVE_BIT), | |
e342c807 PB |
761 | /* completion is deferred through io_comp_state */ |
762 | REQ_F_COMPLETE_INLINE = BIT(REQ_F_COMPLETE_INLINE_BIT), | |
230d50d4 JA |
763 | /* caller should reissue async */ |
764 | REQ_F_REISSUE = BIT(REQ_F_REISSUE_BIT), | |
8c130827 PB |
765 | /* don't attempt request reissue, see io_rw_reissue() */ |
766 | REQ_F_DONT_REISSUE = BIT(REQ_F_DONT_REISSUE_BIT), | |
7b29f92d | 767 | /* supports async reads */ |
b191e2df | 768 | REQ_F_NOWAIT_READ = BIT(REQ_F_NOWAIT_READ_BIT), |
7b29f92d | 769 | /* supports async writes */ |
b191e2df | 770 | REQ_F_NOWAIT_WRITE = BIT(REQ_F_NOWAIT_WRITE_BIT), |
7b29f92d JA |
771 | /* regular file */ |
772 | REQ_F_ISREG = BIT(REQ_F_ISREG_BIT), | |
b8e64b53 PB |
773 | /* has creds assigned */ |
774 | REQ_F_CREDS = BIT(REQ_F_CREDS_BIT), | |
d7718a9d JA |
775 | }; |
776 | ||
777 | struct async_poll { | |
778 | struct io_poll_iocb poll; | |
807abcb0 | 779 | struct io_poll_iocb *double_poll; |
6b47ee6e PB |
780 | }; |
781 | ||
5b0a6acc PB |
782 | typedef void (*io_req_tw_func_t)(struct io_kiocb *req); |
783 | ||
7cbf1722 | 784 | struct io_task_work { |
5b0a6acc PB |
785 | union { |
786 | struct io_wq_work_node node; | |
787 | struct llist_node fallback_node; | |
788 | }; | |
789 | io_req_tw_func_t func; | |
7cbf1722 JA |
790 | }; |
791 | ||
992da01a PB |
792 | enum { |
793 | IORING_RSRC_FILE = 0, | |
794 | IORING_RSRC_BUFFER = 1, | |
795 | }; | |
796 | ||
09bb8394 JA |
797 | /* |
798 | * NOTE! Each of the iocb union members has the file pointer | |
799 | * as the first entry in their struct definition. So you can | |
800 | * access the file pointer through any of the sub-structs, | |
801 | * or directly as just 'ki_filp' in this struct. | |
802 | */ | |
2b188cc1 | 803 | struct io_kiocb { |
221c5eb2 | 804 | union { |
09bb8394 | 805 | struct file *file; |
9adbd45d | 806 | struct io_rw rw; |
221c5eb2 | 807 | struct io_poll_iocb poll; |
9d805892 | 808 | struct io_poll_update poll_update; |
8ed8d3c3 JA |
809 | struct io_accept accept; |
810 | struct io_sync sync; | |
fbf23849 | 811 | struct io_cancel cancel; |
b29472ee | 812 | struct io_timeout timeout; |
0bdf7a2d | 813 | struct io_timeout_rem timeout_rem; |
3fbb51c1 | 814 | struct io_connect connect; |
e47293fd | 815 | struct io_sr_msg sr_msg; |
15b71abe | 816 | struct io_open open; |
b5dba59e | 817 | struct io_close close; |
269bbe5f | 818 | struct io_rsrc_update rsrc_update; |
4840e418 | 819 | struct io_fadvise fadvise; |
c1ca757b | 820 | struct io_madvise madvise; |
3e4827b0 | 821 | struct io_epoll epoll; |
7d67af2c | 822 | struct io_splice splice; |
ddf0322d | 823 | struct io_provide_buf pbuf; |
1d9e1288 | 824 | struct io_statx statx; |
36f4fa68 | 825 | struct io_shutdown shutdown; |
80a261fd | 826 | struct io_rename rename; |
14a1143b | 827 | struct io_unlink unlink; |
3ca405eb PB |
828 | /* use only after cleaning per-op data, see io_clean_op() */ |
829 | struct io_completion compl; | |
221c5eb2 | 830 | }; |
2b188cc1 | 831 | |
e8c2bc1f JA |
832 | /* opcode allocated if it needs to store data for async defer */ |
833 | void *async_data; | |
d625c6ee | 834 | u8 opcode; |
65a6543d XW |
835 | /* polled IO has completed */ |
836 | u8 iopoll_completed; | |
2b188cc1 | 837 | |
4f4eeba8 | 838 | u16 buf_index; |
9cf7c104 | 839 | u32 result; |
4f4eeba8 | 840 | |
010e8e6b PB |
841 | struct io_ring_ctx *ctx; |
842 | unsigned int flags; | |
abc54d63 | 843 | atomic_t refs; |
010e8e6b PB |
844 | struct task_struct *task; |
845 | u64 user_data; | |
d7718a9d | 846 | |
f2f87370 | 847 | struct io_kiocb *link; |
269bbe5f | 848 | struct percpu_ref *fixed_rsrc_refs; |
fcb323cc | 849 | |
b303fe2e | 850 | /* used with ctx->iopoll_list with reads/writes */ |
010e8e6b | 851 | struct list_head inflight_entry; |
5b0a6acc | 852 | struct io_task_work io_task_work; |
010e8e6b PB |
853 | /* for polled requests, i.e. IORING_OP_POLL_ADD and async armed poll */ |
854 | struct hlist_node hash_node; | |
855 | struct async_poll *apoll; | |
856 | struct io_wq_work work; | |
fe7e3257 | 857 | const struct cred *creds; |
c10d1f98 | 858 | |
eae071c9 PB |
859 | /* store used ubuf, so we can prevent reloading */ |
860 | struct io_mapped_ubuf *imu; | |
2b188cc1 | 861 | }; |
05589553 | 862 | |
13bf43f5 PB |
863 | struct io_tctx_node { |
864 | struct list_head ctx_node; | |
865 | struct task_struct *task; | |
13bf43f5 PB |
866 | struct io_ring_ctx *ctx; |
867 | }; | |
868 | ||
27dc8338 PB |
869 | struct io_defer_entry { |
870 | struct list_head list; | |
871 | struct io_kiocb *req; | |
9cf7c104 | 872 | u32 seq; |
2b188cc1 JA |
873 | }; |
874 | ||
d3656344 | 875 | struct io_op_def { |
d3656344 JA |
876 | /* needs req->file assigned */ |
877 | unsigned needs_file : 1; | |
d3656344 JA |
878 | /* hash wq insertion if file is a regular file */ |
879 | unsigned hash_reg_file : 1; | |
880 | /* unbound wq insertion if file is a non-regular file */ | |
881 | unsigned unbound_nonreg_file : 1; | |
66f4af93 JA |
882 | /* opcode is not supported by this kernel */ |
883 | unsigned not_supported : 1; | |
8a72758c JA |
884 | /* set if opcode supports polled "wait" */ |
885 | unsigned pollin : 1; | |
886 | unsigned pollout : 1; | |
bcda7baa JA |
887 | /* op supports buffer selection */ |
888 | unsigned buffer_select : 1; | |
26f0505a PB |
889 | /* do prep async if is going to be punted */ |
890 | unsigned needs_async_setup : 1; | |
27926b68 JA |
891 | /* should block plug */ |
892 | unsigned plug : 1; | |
e8c2bc1f JA |
893 | /* size of async data needed, if any */ |
894 | unsigned short async_size; | |
d3656344 JA |
895 | }; |
896 | ||
0918682b | 897 | static const struct io_op_def io_op_defs[] = { |
0463b6c5 PB |
898 | [IORING_OP_NOP] = {}, |
899 | [IORING_OP_READV] = { | |
d3656344 JA |
900 | .needs_file = 1, |
901 | .unbound_nonreg_file = 1, | |
8a72758c | 902 | .pollin = 1, |
4d954c25 | 903 | .buffer_select = 1, |
26f0505a | 904 | .needs_async_setup = 1, |
27926b68 | 905 | .plug = 1, |
e8c2bc1f | 906 | .async_size = sizeof(struct io_async_rw), |
d3656344 | 907 | }, |
0463b6c5 | 908 | [IORING_OP_WRITEV] = { |
d3656344 JA |
909 | .needs_file = 1, |
910 | .hash_reg_file = 1, | |
911 | .unbound_nonreg_file = 1, | |
8a72758c | 912 | .pollout = 1, |
26f0505a | 913 | .needs_async_setup = 1, |
27926b68 | 914 | .plug = 1, |
e8c2bc1f | 915 | .async_size = sizeof(struct io_async_rw), |
d3656344 | 916 | }, |
0463b6c5 | 917 | [IORING_OP_FSYNC] = { |
d3656344 JA |
918 | .needs_file = 1, |
919 | }, | |
0463b6c5 | 920 | [IORING_OP_READ_FIXED] = { |
d3656344 JA |
921 | .needs_file = 1, |
922 | .unbound_nonreg_file = 1, | |
8a72758c | 923 | .pollin = 1, |
27926b68 | 924 | .plug = 1, |
e8c2bc1f | 925 | .async_size = sizeof(struct io_async_rw), |
d3656344 | 926 | }, |
0463b6c5 | 927 | [IORING_OP_WRITE_FIXED] = { |
d3656344 JA |
928 | .needs_file = 1, |
929 | .hash_reg_file = 1, | |
930 | .unbound_nonreg_file = 1, | |
8a72758c | 931 | .pollout = 1, |
27926b68 | 932 | .plug = 1, |
e8c2bc1f | 933 | .async_size = sizeof(struct io_async_rw), |
d3656344 | 934 | }, |
0463b6c5 | 935 | [IORING_OP_POLL_ADD] = { |
d3656344 JA |
936 | .needs_file = 1, |
937 | .unbound_nonreg_file = 1, | |
938 | }, | |
0463b6c5 PB |
939 | [IORING_OP_POLL_REMOVE] = {}, |
940 | [IORING_OP_SYNC_FILE_RANGE] = { | |
d3656344 JA |
941 | .needs_file = 1, |
942 | }, | |
0463b6c5 | 943 | [IORING_OP_SENDMSG] = { |
d3656344 JA |
944 | .needs_file = 1, |
945 | .unbound_nonreg_file = 1, | |
8a72758c | 946 | .pollout = 1, |
26f0505a | 947 | .needs_async_setup = 1, |
e8c2bc1f | 948 | .async_size = sizeof(struct io_async_msghdr), |
d3656344 | 949 | }, |
0463b6c5 | 950 | [IORING_OP_RECVMSG] = { |
d3656344 JA |
951 | .needs_file = 1, |
952 | .unbound_nonreg_file = 1, | |
8a72758c | 953 | .pollin = 1, |
52de1fe1 | 954 | .buffer_select = 1, |
26f0505a | 955 | .needs_async_setup = 1, |
e8c2bc1f | 956 | .async_size = sizeof(struct io_async_msghdr), |
d3656344 | 957 | }, |
0463b6c5 | 958 | [IORING_OP_TIMEOUT] = { |
e8c2bc1f | 959 | .async_size = sizeof(struct io_timeout_data), |
d3656344 | 960 | }, |
9c8e11b3 PB |
961 | [IORING_OP_TIMEOUT_REMOVE] = { |
962 | /* used by timeout updates' prep() */ | |
9c8e11b3 | 963 | }, |
0463b6c5 | 964 | [IORING_OP_ACCEPT] = { |
d3656344 JA |
965 | .needs_file = 1, |
966 | .unbound_nonreg_file = 1, | |
8a72758c | 967 | .pollin = 1, |
d3656344 | 968 | }, |
0463b6c5 PB |
969 | [IORING_OP_ASYNC_CANCEL] = {}, |
970 | [IORING_OP_LINK_TIMEOUT] = { | |
e8c2bc1f | 971 | .async_size = sizeof(struct io_timeout_data), |
d3656344 | 972 | }, |
0463b6c5 | 973 | [IORING_OP_CONNECT] = { |
d3656344 JA |
974 | .needs_file = 1, |
975 | .unbound_nonreg_file = 1, | |
8a72758c | 976 | .pollout = 1, |
26f0505a | 977 | .needs_async_setup = 1, |
e8c2bc1f | 978 | .async_size = sizeof(struct io_async_connect), |
d3656344 | 979 | }, |
0463b6c5 | 980 | [IORING_OP_FALLOCATE] = { |
d3656344 | 981 | .needs_file = 1, |
d3656344 | 982 | }, |
44526bed JA |
983 | [IORING_OP_OPENAT] = {}, |
984 | [IORING_OP_CLOSE] = {}, | |
985 | [IORING_OP_FILES_UPDATE] = {}, | |
986 | [IORING_OP_STATX] = {}, | |
0463b6c5 | 987 | [IORING_OP_READ] = { |
3a6820f2 JA |
988 | .needs_file = 1, |
989 | .unbound_nonreg_file = 1, | |
8a72758c | 990 | .pollin = 1, |
bcda7baa | 991 | .buffer_select = 1, |
27926b68 | 992 | .plug = 1, |
e8c2bc1f | 993 | .async_size = sizeof(struct io_async_rw), |
3a6820f2 | 994 | }, |
0463b6c5 | 995 | [IORING_OP_WRITE] = { |
3a6820f2 JA |
996 | .needs_file = 1, |
997 | .unbound_nonreg_file = 1, | |
8a72758c | 998 | .pollout = 1, |
27926b68 | 999 | .plug = 1, |
e8c2bc1f | 1000 | .async_size = sizeof(struct io_async_rw), |
3a6820f2 | 1001 | }, |
0463b6c5 | 1002 | [IORING_OP_FADVISE] = { |
4840e418 | 1003 | .needs_file = 1, |
c1ca757b | 1004 | }, |
44526bed | 1005 | [IORING_OP_MADVISE] = {}, |
0463b6c5 | 1006 | [IORING_OP_SEND] = { |
fddaface JA |
1007 | .needs_file = 1, |
1008 | .unbound_nonreg_file = 1, | |
8a72758c | 1009 | .pollout = 1, |
fddaface | 1010 | }, |
0463b6c5 | 1011 | [IORING_OP_RECV] = { |
fddaface JA |
1012 | .needs_file = 1, |
1013 | .unbound_nonreg_file = 1, | |
8a72758c | 1014 | .pollin = 1, |
bcda7baa | 1015 | .buffer_select = 1, |
fddaface | 1016 | }, |
0463b6c5 | 1017 | [IORING_OP_OPENAT2] = { |
cebdb986 | 1018 | }, |
3e4827b0 JA |
1019 | [IORING_OP_EPOLL_CTL] = { |
1020 | .unbound_nonreg_file = 1, | |
3e4827b0 | 1021 | }, |
7d67af2c PB |
1022 | [IORING_OP_SPLICE] = { |
1023 | .needs_file = 1, | |
1024 | .hash_reg_file = 1, | |
1025 | .unbound_nonreg_file = 1, | |
ddf0322d JA |
1026 | }, |
1027 | [IORING_OP_PROVIDE_BUFFERS] = {}, | |
067524e9 | 1028 | [IORING_OP_REMOVE_BUFFERS] = {}, |
f2a8d5c7 PB |
1029 | [IORING_OP_TEE] = { |
1030 | .needs_file = 1, | |
1031 | .hash_reg_file = 1, | |
1032 | .unbound_nonreg_file = 1, | |
1033 | }, | |
36f4fa68 JA |
1034 | [IORING_OP_SHUTDOWN] = { |
1035 | .needs_file = 1, | |
1036 | }, | |
44526bed JA |
1037 | [IORING_OP_RENAMEAT] = {}, |
1038 | [IORING_OP_UNLINKAT] = {}, | |
d3656344 JA |
1039 | }; |
1040 | ||
7a612350 | 1041 | static bool io_disarm_next(struct io_kiocb *req); |
eef51daa | 1042 | static void io_uring_del_tctx_node(unsigned long index); |
9936c7c2 PB |
1043 | static void io_uring_try_cancel_requests(struct io_ring_ctx *ctx, |
1044 | struct task_struct *task, | |
3dd0c97a | 1045 | bool cancel_all); |
78cc687b | 1046 | static void io_uring_cancel_generic(bool cancel_all, struct io_sq_data *sqd); |
1ffc5422 | 1047 | |
d4d19c19 PB |
1048 | static bool io_cqring_fill_event(struct io_ring_ctx *ctx, u64 user_data, |
1049 | long res, unsigned int cflags); | |
ec9c02ad | 1050 | static void io_put_req(struct io_kiocb *req); |
216578e5 | 1051 | static void io_put_req_deferred(struct io_kiocb *req, int nr); |
c7dae4ba | 1052 | static void io_dismantle_req(struct io_kiocb *req); |
94ae5e77 JA |
1053 | static struct io_kiocb *io_prep_linked_timeout(struct io_kiocb *req); |
1054 | static void io_queue_linked_timeout(struct io_kiocb *req); | |
fdecb662 | 1055 | static int __io_register_rsrc_update(struct io_ring_ctx *ctx, unsigned type, |
c3bdad02 | 1056 | struct io_uring_rsrc_update2 *up, |
98f0b3b4 | 1057 | unsigned nr_args); |
68fb8979 | 1058 | static void io_clean_op(struct io_kiocb *req); |
ac177053 PB |
1059 | static struct file *io_file_get(struct io_ring_ctx *ctx, |
1060 | struct io_submit_state *state, | |
8371adf5 | 1061 | struct io_kiocb *req, int fd, bool fixed); |
c5eef2b9 | 1062 | static void __io_queue_sqe(struct io_kiocb *req); |
269bbe5f | 1063 | static void io_rsrc_put_work(struct work_struct *work); |
de0617e4 | 1064 | |
907d1df3 | 1065 | static void io_req_task_queue(struct io_kiocb *req); |
2a2758f2 | 1066 | static void io_submit_flush_completions(struct io_ring_ctx *ctx); |
5082620f | 1067 | static bool io_poll_remove_waitqs(struct io_kiocb *req); |
179ae0d1 | 1068 | static int io_req_prep_async(struct io_kiocb *req); |
de0617e4 | 1069 | |
9011bf9a PB |
1070 | static void io_fallback_req_func(struct work_struct *unused); |
1071 | ||
2b188cc1 JA |
1072 | static struct kmem_cache *req_cachep; |
1073 | ||
0918682b | 1074 | static const struct file_operations io_uring_fops; |
2b188cc1 JA |
1075 | |
1076 | struct sock *io_uring_get_socket(struct file *file) | |
1077 | { | |
1078 | #if defined(CONFIG_UNIX) | |
1079 | if (file->f_op == &io_uring_fops) { | |
1080 | struct io_ring_ctx *ctx = file->private_data; | |
1081 | ||
1082 | return ctx->ring_sock->sk; | |
1083 | } | |
1084 | #endif | |
1085 | return NULL; | |
1086 | } | |
1087 | EXPORT_SYMBOL(io_uring_get_socket); | |
1088 | ||
f2f87370 PB |
1089 | #define io_for_each_link(pos, head) \ |
1090 | for (pos = (head); pos; pos = pos->link) | |
1091 | ||
b895c9a6 | 1092 | static inline void io_req_set_rsrc_node(struct io_kiocb *req) |
36f72fe2 PB |
1093 | { |
1094 | struct io_ring_ctx *ctx = req->ctx; | |
1095 | ||
269bbe5f | 1096 | if (!req->fixed_rsrc_refs) { |
a7f0ed5a | 1097 | req->fixed_rsrc_refs = &ctx->rsrc_node->refs; |
269bbe5f | 1098 | percpu_ref_get(req->fixed_rsrc_refs); |
36f72fe2 PB |
1099 | } |
1100 | } | |
1101 | ||
f70865db PB |
1102 | static void io_refs_resurrect(struct percpu_ref *ref, struct completion *compl) |
1103 | { | |
1104 | bool got = percpu_ref_tryget(ref); | |
1105 | ||
1106 | /* already at zero, wait for ->release() */ | |
1107 | if (!got) | |
1108 | wait_for_completion(compl); | |
1109 | percpu_ref_resurrect(ref); | |
1110 | if (got) | |
1111 | percpu_ref_put(ref); | |
1112 | } | |
1113 | ||
3dd0c97a PB |
1114 | static bool io_match_task(struct io_kiocb *head, struct task_struct *task, |
1115 | bool cancel_all) | |
08d23634 PB |
1116 | { |
1117 | struct io_kiocb *req; | |
1118 | ||
68207680 | 1119 | if (task && head->task != task) |
08d23634 | 1120 | return false; |
3dd0c97a | 1121 | if (cancel_all) |
08d23634 PB |
1122 | return true; |
1123 | ||
1124 | io_for_each_link(req, head) { | |
b05a1bcd | 1125 | if (req->flags & REQ_F_INFLIGHT) |
02a13674 | 1126 | return true; |
08d23634 PB |
1127 | } |
1128 | return false; | |
1129 | } | |
1130 | ||
93d2bcd2 | 1131 | static inline void req_set_fail(struct io_kiocb *req) |
c40f6379 | 1132 | { |
93d2bcd2 | 1133 | req->flags |= REQ_F_FAIL; |
c40f6379 | 1134 | } |
4a38aed2 | 1135 | |
2b188cc1 JA |
1136 | static void io_ring_ctx_ref_free(struct percpu_ref *ref) |
1137 | { | |
1138 | struct io_ring_ctx *ctx = container_of(ref, struct io_ring_ctx, refs); | |
1139 | ||
0f158b4c | 1140 | complete(&ctx->ref_comp); |
2b188cc1 JA |
1141 | } |
1142 | ||
8eb7e2d0 PB |
1143 | static inline bool io_is_timeout_noseq(struct io_kiocb *req) |
1144 | { | |
1145 | return !req->timeout.off; | |
1146 | } | |
1147 | ||
2b188cc1 JA |
1148 | static struct io_ring_ctx *io_ring_ctx_alloc(struct io_uring_params *p) |
1149 | { | |
1150 | struct io_ring_ctx *ctx; | |
78076bb6 | 1151 | int hash_bits; |
2b188cc1 JA |
1152 | |
1153 | ctx = kzalloc(sizeof(*ctx), GFP_KERNEL); | |
1154 | if (!ctx) | |
1155 | return NULL; | |
1156 | ||
78076bb6 JA |
1157 | /* |
1158 | * Use 5 bits less than the max cq entries, that should give us around | |
1159 | * 32 entries per hash list if totally full and uniformly spread. | |
1160 | */ | |
1161 | hash_bits = ilog2(p->cq_entries); | |
1162 | hash_bits -= 5; | |
1163 | if (hash_bits <= 0) | |
1164 | hash_bits = 1; | |
1165 | ctx->cancel_hash_bits = hash_bits; | |
1166 | ctx->cancel_hash = kmalloc((1U << hash_bits) * sizeof(struct hlist_head), | |
1167 | GFP_KERNEL); | |
1168 | if (!ctx->cancel_hash) | |
1169 | goto err; | |
1170 | __hash_init(ctx->cancel_hash, 1U << hash_bits); | |
1171 | ||
6224843d PB |
1172 | ctx->dummy_ubuf = kzalloc(sizeof(*ctx->dummy_ubuf), GFP_KERNEL); |
1173 | if (!ctx->dummy_ubuf) | |
1174 | goto err; | |
1175 | /* set invalid range, so io_import_fixed() fails meeting it */ | |
1176 | ctx->dummy_ubuf->ubuf = -1UL; | |
1177 | ||
21482896 | 1178 | if (percpu_ref_init(&ctx->refs, io_ring_ctx_ref_free, |
206aefde JA |
1179 | PERCPU_REF_ALLOW_REINIT, GFP_KERNEL)) |
1180 | goto err; | |
2b188cc1 JA |
1181 | |
1182 | ctx->flags = p->flags; | |
90554200 | 1183 | init_waitqueue_head(&ctx->sqo_sq_wait); |
69fb2131 | 1184 | INIT_LIST_HEAD(&ctx->sqd_list); |
311997b3 | 1185 | init_waitqueue_head(&ctx->poll_wait); |
1d7bb1d5 | 1186 | INIT_LIST_HEAD(&ctx->cq_overflow_list); |
0f158b4c | 1187 | init_completion(&ctx->ref_comp); |
9e15c3a0 | 1188 | xa_init_flags(&ctx->io_buffers, XA_FLAGS_ALLOC1); |
61cf9370 | 1189 | xa_init_flags(&ctx->personalities, XA_FLAGS_ALLOC1); |
2b188cc1 | 1190 | mutex_init(&ctx->uring_lock); |
311997b3 | 1191 | init_waitqueue_head(&ctx->cq_wait); |
2b188cc1 | 1192 | spin_lock_init(&ctx->completion_lock); |
540e32a0 | 1193 | INIT_LIST_HEAD(&ctx->iopoll_list); |
de0617e4 | 1194 | INIT_LIST_HEAD(&ctx->defer_list); |
5262f567 | 1195 | INIT_LIST_HEAD(&ctx->timeout_list); |
d67d2263 BM |
1196 | spin_lock_init(&ctx->rsrc_ref_lock); |
1197 | INIT_LIST_HEAD(&ctx->rsrc_ref_list); | |
269bbe5f BM |
1198 | INIT_DELAYED_WORK(&ctx->rsrc_put_work, io_rsrc_put_work); |
1199 | init_llist_head(&ctx->rsrc_put_llist); | |
13bf43f5 | 1200 | INIT_LIST_HEAD(&ctx->tctx_list); |
1b4c351f | 1201 | INIT_LIST_HEAD(&ctx->submit_state.comp.free_list); |
d0acdee2 | 1202 | INIT_LIST_HEAD(&ctx->locked_free_list); |
9011bf9a | 1203 | INIT_DELAYED_WORK(&ctx->fallback_work, io_fallback_req_func); |
2b188cc1 | 1204 | return ctx; |
206aefde | 1205 | err: |
6224843d | 1206 | kfree(ctx->dummy_ubuf); |
78076bb6 | 1207 | kfree(ctx->cancel_hash); |
206aefde JA |
1208 | kfree(ctx); |
1209 | return NULL; | |
2b188cc1 JA |
1210 | } |
1211 | ||
8f6ed49a PB |
1212 | static void io_account_cq_overflow(struct io_ring_ctx *ctx) |
1213 | { | |
1214 | struct io_rings *r = ctx->rings; | |
1215 | ||
1216 | WRITE_ONCE(r->cq_overflow, READ_ONCE(r->cq_overflow) + 1); | |
1217 | ctx->cq_extra--; | |
1218 | } | |
1219 | ||
9cf7c104 | 1220 | static bool req_need_defer(struct io_kiocb *req, u32 seq) |
7adf4eaf | 1221 | { |
2bc9930e JA |
1222 | if (unlikely(req->flags & REQ_F_IO_DRAIN)) { |
1223 | struct io_ring_ctx *ctx = req->ctx; | |
a197f664 | 1224 | |
8f6ed49a | 1225 | return seq + READ_ONCE(ctx->cq_extra) != ctx->cached_cq_tail; |
2bc9930e | 1226 | } |
de0617e4 | 1227 | |
9d858b21 | 1228 | return false; |
de0617e4 JA |
1229 | } |
1230 | ||
c97d8a0f PB |
1231 | #define FFS_ASYNC_READ 0x1UL |
1232 | #define FFS_ASYNC_WRITE 0x2UL | |
1233 | #ifdef CONFIG_64BIT | |
1234 | #define FFS_ISREG 0x4UL | |
1235 | #else | |
1236 | #define FFS_ISREG 0x0UL | |
1237 | #endif | |
1238 | #define FFS_MASK ~(FFS_ASYNC_READ|FFS_ASYNC_WRITE|FFS_ISREG) | |
1239 | ||
1240 | static inline bool io_req_ffs_set(struct io_kiocb *req) | |
1241 | { | |
1242 | return IS_ENABLED(CONFIG_64BIT) && (req->flags & REQ_F_FIXED_FILE); | |
1243 | } | |
1244 | ||
ce3d5aae PB |
1245 | static void io_req_track_inflight(struct io_kiocb *req) |
1246 | { | |
ce3d5aae | 1247 | if (!(req->flags & REQ_F_INFLIGHT)) { |
ce3d5aae | 1248 | req->flags |= REQ_F_INFLIGHT; |
b303fe2e | 1249 | atomic_inc(¤t->io_uring->inflight_tracked); |
ce3d5aae PB |
1250 | } |
1251 | } | |
1252 | ||
1e6fa521 JA |
1253 | static void io_prep_async_work(struct io_kiocb *req) |
1254 | { | |
1255 | const struct io_op_def *def = &io_op_defs[req->opcode]; | |
1e6fa521 JA |
1256 | struct io_ring_ctx *ctx = req->ctx; |
1257 | ||
b8e64b53 PB |
1258 | if (!(req->flags & REQ_F_CREDS)) { |
1259 | req->flags |= REQ_F_CREDS; | |
c10d1f98 | 1260 | req->creds = get_current_cred(); |
b8e64b53 | 1261 | } |
003e8dcc | 1262 | |
e1d675df PB |
1263 | req->work.list.next = NULL; |
1264 | req->work.flags = 0; | |
feaadc4f PB |
1265 | if (req->flags & REQ_F_FORCE_ASYNC) |
1266 | req->work.flags |= IO_WQ_WORK_CONCURRENT; | |
1267 | ||
1e6fa521 JA |
1268 | if (req->flags & REQ_F_ISREG) { |
1269 | if (def->hash_reg_file || (ctx->flags & IORING_SETUP_IOPOLL)) | |
1270 | io_wq_hash_work(&req->work, file_inode(req->file)); | |
4b982bd0 | 1271 | } else if (!req->file || !S_ISBLK(file_inode(req->file)->i_mode)) { |
1e6fa521 JA |
1272 | if (def->unbound_nonreg_file) |
1273 | req->work.flags |= IO_WQ_WORK_UNBOUND; | |
1274 | } | |
e1d675df PB |
1275 | |
1276 | switch (req->opcode) { | |
1277 | case IORING_OP_SPLICE: | |
1278 | case IORING_OP_TEE: | |
e1d675df PB |
1279 | if (!S_ISREG(file_inode(req->splice.file_in)->i_mode)) |
1280 | req->work.flags |= IO_WQ_WORK_UNBOUND; | |
1281 | break; | |
1282 | } | |
561fb04a | 1283 | } |
cccf0ee8 | 1284 | |
cbdcb435 | 1285 | static void io_prep_async_link(struct io_kiocb *req) |
561fb04a | 1286 | { |
cbdcb435 | 1287 | struct io_kiocb *cur; |
54a91f3b | 1288 | |
44eff40a PB |
1289 | if (req->flags & REQ_F_LINK_TIMEOUT) { |
1290 | struct io_ring_ctx *ctx = req->ctx; | |
1291 | ||
1292 | spin_lock_irq(&ctx->completion_lock); | |
1293 | io_for_each_link(cur, req) | |
1294 | io_prep_async_work(cur); | |
1295 | spin_unlock_irq(&ctx->completion_lock); | |
1296 | } else { | |
1297 | io_for_each_link(cur, req) | |
1298 | io_prep_async_work(cur); | |
1299 | } | |
561fb04a JA |
1300 | } |
1301 | ||
ebf93667 | 1302 | static void io_queue_async_work(struct io_kiocb *req) |
561fb04a | 1303 | { |
a197f664 | 1304 | struct io_ring_ctx *ctx = req->ctx; |
cbdcb435 | 1305 | struct io_kiocb *link = io_prep_linked_timeout(req); |
5aa75ed5 | 1306 | struct io_uring_task *tctx = req->task->io_uring; |
561fb04a | 1307 | |
3bfe6106 JA |
1308 | BUG_ON(!tctx); |
1309 | BUG_ON(!tctx->io_wq); | |
561fb04a | 1310 | |
cbdcb435 PB |
1311 | /* init ->work of the whole link before punting */ |
1312 | io_prep_async_link(req); | |
991468dc JA |
1313 | |
1314 | /* | |
1315 | * Not expected to happen, but if we do have a bug where this _can_ | |
1316 | * happen, catch it here and ensure the request is marked as | |
1317 | * canceled. That will make io-wq go through the usual work cancel | |
1318 | * procedure rather than attempt to run this request (or create a new | |
1319 | * worker for it). | |
1320 | */ | |
1321 | if (WARN_ON_ONCE(!same_thread_group(req->task, current))) | |
1322 | req->work.flags |= IO_WQ_WORK_CANCEL; | |
1323 | ||
d07f1e8a PB |
1324 | trace_io_uring_queue_async_work(ctx, io_wq_is_hashed(&req->work), req, |
1325 | &req->work, req->flags); | |
ebf93667 | 1326 | io_wq_enqueue(tctx->io_wq, &req->work); |
7271ef3a JA |
1327 | if (link) |
1328 | io_queue_linked_timeout(link); | |
cbdcb435 PB |
1329 | } |
1330 | ||
1ee4160c | 1331 | static void io_kill_timeout(struct io_kiocb *req, int status) |
8c855885 | 1332 | __must_hold(&req->ctx->completion_lock) |
5262f567 | 1333 | { |
e8c2bc1f | 1334 | struct io_timeout_data *io = req->async_data; |
5262f567 | 1335 | |
fd9c7bc5 | 1336 | if (hrtimer_try_to_cancel(&io->timer) != -1) { |
01cec8c1 PB |
1337 | atomic_set(&req->ctx->cq_timeouts, |
1338 | atomic_read(&req->ctx->cq_timeouts) + 1); | |
135fcde8 | 1339 | list_del_init(&req->timeout.list); |
d4d19c19 | 1340 | io_cqring_fill_event(req->ctx, req->user_data, status, 0); |
216578e5 | 1341 | io_put_req_deferred(req, 1); |
5262f567 JA |
1342 | } |
1343 | } | |
1344 | ||
441b8a78 | 1345 | static void io_queue_deferred(struct io_ring_ctx *ctx) |
de0617e4 | 1346 | { |
441b8a78 | 1347 | while (!list_empty(&ctx->defer_list)) { |
27dc8338 PB |
1348 | struct io_defer_entry *de = list_first_entry(&ctx->defer_list, |
1349 | struct io_defer_entry, list); | |
de0617e4 | 1350 | |
9cf7c104 | 1351 | if (req_need_defer(de->req, de->seq)) |
04518945 | 1352 | break; |
27dc8338 | 1353 | list_del_init(&de->list); |
907d1df3 | 1354 | io_req_task_queue(de->req); |
27dc8338 | 1355 | kfree(de); |
441b8a78 | 1356 | } |
04518945 PB |
1357 | } |
1358 | ||
360428f8 | 1359 | static void io_flush_timeouts(struct io_ring_ctx *ctx) |
de0617e4 | 1360 | { |
441b8a78 | 1361 | u32 seq = ctx->cached_cq_tail - atomic_read(&ctx->cq_timeouts); |
f010505b | 1362 | |
f18ee4cf | 1363 | while (!list_empty(&ctx->timeout_list)) { |
f010505b | 1364 | u32 events_needed, events_got; |
360428f8 | 1365 | struct io_kiocb *req = list_first_entry(&ctx->timeout_list, |
135fcde8 | 1366 | struct io_kiocb, timeout.list); |
de0617e4 | 1367 | |
8eb7e2d0 | 1368 | if (io_is_timeout_noseq(req)) |
360428f8 | 1369 | break; |
f010505b MDG |
1370 | |
1371 | /* | |
1372 | * Since seq can easily wrap around over time, subtract | |
1373 | * the last seq at which timeouts were flushed before comparing. | |
1374 | * Assuming not more than 2^31-1 events have happened since, | |
1375 | * these subtractions won't have wrapped, so we can check if | |
1376 | * target is in [last_seq, current_seq] by comparing the two. | |
1377 | */ | |
1378 | events_needed = req->timeout.target_seq - ctx->cq_last_tm_flush; | |
1379 | events_got = seq - ctx->cq_last_tm_flush; | |
1380 | if (events_got < events_needed) | |
360428f8 | 1381 | break; |
bfe68a22 | 1382 | |
135fcde8 | 1383 | list_del_init(&req->timeout.list); |
1ee4160c | 1384 | io_kill_timeout(req, 0); |
f18ee4cf | 1385 | } |
f010505b | 1386 | ctx->cq_last_tm_flush = seq; |
360428f8 | 1387 | } |
5262f567 | 1388 | |
2335f6f5 | 1389 | static void __io_commit_cqring_flush(struct io_ring_ctx *ctx) |
360428f8 | 1390 | { |
2335f6f5 PB |
1391 | if (ctx->off_timeout_used) |
1392 | io_flush_timeouts(ctx); | |
1393 | if (ctx->drain_active) | |
1394 | io_queue_deferred(ctx); | |
1395 | } | |
1396 | ||
1397 | static inline void io_commit_cqring(struct io_ring_ctx *ctx) | |
1398 | { | |
1399 | if (unlikely(ctx->off_timeout_used || ctx->drain_active)) | |
1400 | __io_commit_cqring_flush(ctx); | |
ec30e04b PB |
1401 | /* order cqe stores with ring update */ |
1402 | smp_store_release(&ctx->rings->cq.tail, ctx->cached_cq_tail); | |
de0617e4 JA |
1403 | } |
1404 | ||
90554200 JA |
1405 | static inline bool io_sqring_full(struct io_ring_ctx *ctx) |
1406 | { | |
1407 | struct io_rings *r = ctx->rings; | |
1408 | ||
a566c556 | 1409 | return READ_ONCE(r->sq.tail) - ctx->cached_sq_head == ctx->sq_entries; |
90554200 JA |
1410 | } |
1411 | ||
888aae2e PB |
1412 | static inline unsigned int __io_cqring_events(struct io_ring_ctx *ctx) |
1413 | { | |
1414 | return ctx->cached_cq_tail - READ_ONCE(ctx->rings->cq.head); | |
1415 | } | |
1416 | ||
d068b506 | 1417 | static inline struct io_uring_cqe *io_get_cqe(struct io_ring_ctx *ctx) |
2b188cc1 | 1418 | { |
75b28aff | 1419 | struct io_rings *rings = ctx->rings; |
ea5ab3b5 | 1420 | unsigned tail, mask = ctx->cq_entries - 1; |
2b188cc1 | 1421 | |
115e12e5 SB |
1422 | /* |
1423 | * writes to the cq entry need to come after reading head; the | |
1424 | * control dependency is enough as we're using WRITE_ONCE to | |
1425 | * fill the cq entry | |
1426 | */ | |
a566c556 | 1427 | if (__io_cqring_events(ctx) == ctx->cq_entries) |
2b188cc1 JA |
1428 | return NULL; |
1429 | ||
888aae2e | 1430 | tail = ctx->cached_cq_tail++; |
ea5ab3b5 | 1431 | return &rings->cqes[tail & mask]; |
2b188cc1 JA |
1432 | } |
1433 | ||
f2842ab5 JA |
1434 | static inline bool io_should_trigger_evfd(struct io_ring_ctx *ctx) |
1435 | { | |
44c769de | 1436 | if (likely(!ctx->cq_ev_fd)) |
f0b493e6 | 1437 | return false; |
7e55a19c SG |
1438 | if (READ_ONCE(ctx->rings->cq_flags) & IORING_CQ_EVENTFD_DISABLED) |
1439 | return false; | |
44c769de | 1440 | return !ctx->eventfd_async || io_wq_current_is_worker(); |
f2842ab5 JA |
1441 | } |
1442 | ||
b41e9852 | 1443 | static void io_cqring_ev_posted(struct io_ring_ctx *ctx) |
1d7bb1d5 | 1444 | { |
5fd46178 JA |
1445 | /* |
1446 | * wake_up_all() may seem excessive, but io_wake_function() and | |
1447 | * io_should_wake() handle the termination of the loop and only | |
1448 | * wake as many waiters as we need to. | |
1449 | */ | |
1450 | if (wq_has_sleeper(&ctx->cq_wait)) | |
1451 | wake_up_all(&ctx->cq_wait); | |
534ca6d6 JA |
1452 | if (ctx->sq_data && waitqueue_active(&ctx->sq_data->wait)) |
1453 | wake_up(&ctx->sq_data->wait); | |
b41e9852 | 1454 | if (io_should_trigger_evfd(ctx)) |
1d7bb1d5 | 1455 | eventfd_signal(ctx->cq_ev_fd, 1); |
311997b3 PB |
1456 | if (waitqueue_active(&ctx->poll_wait)) { |
1457 | wake_up_interruptible(&ctx->poll_wait); | |
4aa84f2f PB |
1458 | kill_fasync(&ctx->cq_fasync, SIGIO, POLL_IN); |
1459 | } | |
1d7bb1d5 JA |
1460 | } |
1461 | ||
80c18e4a PB |
1462 | static void io_cqring_ev_posted_iopoll(struct io_ring_ctx *ctx) |
1463 | { | |
1464 | if (ctx->flags & IORING_SETUP_SQPOLL) { | |
5fd46178 JA |
1465 | if (wq_has_sleeper(&ctx->cq_wait)) |
1466 | wake_up_all(&ctx->cq_wait); | |
80c18e4a PB |
1467 | } |
1468 | if (io_should_trigger_evfd(ctx)) | |
1469 | eventfd_signal(ctx->cq_ev_fd, 1); | |
311997b3 PB |
1470 | if (waitqueue_active(&ctx->poll_wait)) { |
1471 | wake_up_interruptible(&ctx->poll_wait); | |
4aa84f2f PB |
1472 | kill_fasync(&ctx->cq_fasync, SIGIO, POLL_IN); |
1473 | } | |
80c18e4a PB |
1474 | } |
1475 | ||
c4a2ed72 | 1476 | /* Returns true if there are no backlogged entries after the flush */ |
6c2450ae | 1477 | static bool __io_cqring_overflow_flush(struct io_ring_ctx *ctx, bool force) |
1d7bb1d5 | 1478 | { |
1d7bb1d5 | 1479 | unsigned long flags; |
b18032bb | 1480 | bool all_flushed, posted; |
1d7bb1d5 | 1481 | |
a566c556 | 1482 | if (!force && __io_cqring_events(ctx) == ctx->cq_entries) |
e23de15f | 1483 | return false; |
1d7bb1d5 | 1484 | |
b18032bb | 1485 | posted = false; |
1d7bb1d5 | 1486 | spin_lock_irqsave(&ctx->completion_lock, flags); |
6c2450ae | 1487 | while (!list_empty(&ctx->cq_overflow_list)) { |
d068b506 | 1488 | struct io_uring_cqe *cqe = io_get_cqe(ctx); |
6c2450ae | 1489 | struct io_overflow_cqe *ocqe; |
e6c8aa9a | 1490 | |
1d7bb1d5 JA |
1491 | if (!cqe && !force) |
1492 | break; | |
6c2450ae PB |
1493 | ocqe = list_first_entry(&ctx->cq_overflow_list, |
1494 | struct io_overflow_cqe, list); | |
1495 | if (cqe) | |
1496 | memcpy(cqe, &ocqe->cqe, sizeof(*cqe)); | |
1497 | else | |
8f6ed49a PB |
1498 | io_account_cq_overflow(ctx); |
1499 | ||
b18032bb | 1500 | posted = true; |
6c2450ae PB |
1501 | list_del(&ocqe->list); |
1502 | kfree(ocqe); | |
1d7bb1d5 JA |
1503 | } |
1504 | ||
09e88404 PB |
1505 | all_flushed = list_empty(&ctx->cq_overflow_list); |
1506 | if (all_flushed) { | |
5ed7a37d | 1507 | clear_bit(0, &ctx->check_cq_overflow); |
20c0b380 NA |
1508 | WRITE_ONCE(ctx->rings->sq_flags, |
1509 | ctx->rings->sq_flags & ~IORING_SQ_CQ_OVERFLOW); | |
09e88404 | 1510 | } |
46930143 | 1511 | |
b18032bb JA |
1512 | if (posted) |
1513 | io_commit_cqring(ctx); | |
1d7bb1d5 | 1514 | spin_unlock_irqrestore(&ctx->completion_lock, flags); |
b18032bb JA |
1515 | if (posted) |
1516 | io_cqring_ev_posted(ctx); | |
09e88404 | 1517 | return all_flushed; |
1d7bb1d5 JA |
1518 | } |
1519 | ||
6c2450ae | 1520 | static bool io_cqring_overflow_flush(struct io_ring_ctx *ctx, bool force) |
6c503150 | 1521 | { |
ca0a2651 JA |
1522 | bool ret = true; |
1523 | ||
5ed7a37d | 1524 | if (test_bit(0, &ctx->check_cq_overflow)) { |
6c503150 PB |
1525 | /* iopoll syncs against uring_lock, not completion_lock */ |
1526 | if (ctx->flags & IORING_SETUP_IOPOLL) | |
1527 | mutex_lock(&ctx->uring_lock); | |
6c2450ae | 1528 | ret = __io_cqring_overflow_flush(ctx, force); |
6c503150 PB |
1529 | if (ctx->flags & IORING_SETUP_IOPOLL) |
1530 | mutex_unlock(&ctx->uring_lock); | |
1531 | } | |
ca0a2651 JA |
1532 | |
1533 | return ret; | |
6c503150 PB |
1534 | } |
1535 | ||
abc54d63 JA |
1536 | /* |
1537 | * Shamelessly stolen from the mm implementation of page reference checking, | |
1538 | * see commit f958d7b528b1 for details. | |
1539 | */ | |
1540 | #define req_ref_zero_or_close_to_overflow(req) \ | |
1541 | ((unsigned int) atomic_read(&(req->refs)) + 127u <= 127u) | |
1542 | ||
de9b4cca JA |
1543 | static inline bool req_ref_inc_not_zero(struct io_kiocb *req) |
1544 | { | |
abc54d63 | 1545 | return atomic_inc_not_zero(&req->refs); |
de9b4cca JA |
1546 | } |
1547 | ||
1548 | static inline bool req_ref_sub_and_test(struct io_kiocb *req, int refs) | |
1549 | { | |
abc54d63 JA |
1550 | WARN_ON_ONCE(req_ref_zero_or_close_to_overflow(req)); |
1551 | return atomic_sub_and_test(refs, &req->refs); | |
de9b4cca JA |
1552 | } |
1553 | ||
1554 | static inline bool req_ref_put_and_test(struct io_kiocb *req) | |
1555 | { | |
abc54d63 JA |
1556 | WARN_ON_ONCE(req_ref_zero_or_close_to_overflow(req)); |
1557 | return atomic_dec_and_test(&req->refs); | |
de9b4cca JA |
1558 | } |
1559 | ||
1560 | static inline void req_ref_put(struct io_kiocb *req) | |
1561 | { | |
abc54d63 | 1562 | WARN_ON_ONCE(req_ref_put_and_test(req)); |
de9b4cca JA |
1563 | } |
1564 | ||
1565 | static inline void req_ref_get(struct io_kiocb *req) | |
1566 | { | |
abc54d63 JA |
1567 | WARN_ON_ONCE(req_ref_zero_or_close_to_overflow(req)); |
1568 | atomic_inc(&req->refs); | |
de9b4cca JA |
1569 | } |
1570 | ||
6a290a14 PB |
1571 | /* must to be called somewhat shortly after putting a request */ |
1572 | static inline void io_put_task(struct task_struct *task, int nr) | |
1573 | { | |
1574 | struct io_uring_task *tctx = task->io_uring; | |
1575 | ||
1576 | percpu_counter_sub(&tctx->inflight, nr); | |
1577 | if (unlikely(atomic_read(&tctx->in_idle))) | |
1578 | wake_up(&tctx->wait); | |
1579 | put_task_struct_many(task, nr); | |
1580 | } | |
1581 | ||
d4d19c19 PB |
1582 | static bool io_cqring_event_overflow(struct io_ring_ctx *ctx, u64 user_data, |
1583 | long res, unsigned int cflags) | |
2b188cc1 | 1584 | { |
cce4b8b0 | 1585 | struct io_overflow_cqe *ocqe; |
2b188cc1 | 1586 | |
cce4b8b0 PB |
1587 | ocqe = kmalloc(sizeof(*ocqe), GFP_ATOMIC | __GFP_ACCOUNT); |
1588 | if (!ocqe) { | |
1589 | /* | |
1590 | * If we're in ring overflow flush mode, or in task cancel mode, | |
1591 | * or cannot allocate an overflow entry, then we need to drop it | |
1592 | * on the floor. | |
1593 | */ | |
8f6ed49a | 1594 | io_account_cq_overflow(ctx); |
cce4b8b0 | 1595 | return false; |
2b188cc1 | 1596 | } |
cce4b8b0 | 1597 | if (list_empty(&ctx->cq_overflow_list)) { |
5ed7a37d | 1598 | set_bit(0, &ctx->check_cq_overflow); |
20c0b380 NA |
1599 | WRITE_ONCE(ctx->rings->sq_flags, |
1600 | ctx->rings->sq_flags | IORING_SQ_CQ_OVERFLOW); | |
1601 | ||
cce4b8b0 | 1602 | } |
d4d19c19 | 1603 | ocqe->cqe.user_data = user_data; |
cce4b8b0 PB |
1604 | ocqe->cqe.res = res; |
1605 | ocqe->cqe.flags = cflags; | |
1606 | list_add_tail(&ocqe->list, &ctx->cq_overflow_list); | |
1607 | return true; | |
2b188cc1 JA |
1608 | } |
1609 | ||
d4d19c19 PB |
1610 | static inline bool __io_cqring_fill_event(struct io_ring_ctx *ctx, u64 user_data, |
1611 | long res, unsigned int cflags) | |
2b188cc1 JA |
1612 | { |
1613 | struct io_uring_cqe *cqe; | |
1614 | ||
d4d19c19 | 1615 | trace_io_uring_complete(ctx, user_data, res, cflags); |
51c3ff62 | 1616 | |
2b188cc1 JA |
1617 | /* |
1618 | * If we can't get a cq entry, userspace overflowed the | |
1619 | * submission (by quite a lot). Increment the overflow count in | |
1620 | * the ring. | |
1621 | */ | |
d068b506 | 1622 | cqe = io_get_cqe(ctx); |
1d7bb1d5 | 1623 | if (likely(cqe)) { |
d4d19c19 | 1624 | WRITE_ONCE(cqe->user_data, user_data); |
2b188cc1 | 1625 | WRITE_ONCE(cqe->res, res); |
bcda7baa | 1626 | WRITE_ONCE(cqe->flags, cflags); |
8d13326e | 1627 | return true; |
2b188cc1 | 1628 | } |
d4d19c19 | 1629 | return io_cqring_event_overflow(ctx, user_data, res, cflags); |
2b188cc1 JA |
1630 | } |
1631 | ||
8d13326e | 1632 | /* not as hot to bloat with inlining */ |
d4d19c19 PB |
1633 | static noinline bool io_cqring_fill_event(struct io_ring_ctx *ctx, u64 user_data, |
1634 | long res, unsigned int cflags) | |
bcda7baa | 1635 | { |
d4d19c19 | 1636 | return __io_cqring_fill_event(ctx, user_data, res, cflags); |
bcda7baa JA |
1637 | } |
1638 | ||
7a612350 PB |
1639 | static void io_req_complete_post(struct io_kiocb *req, long res, |
1640 | unsigned int cflags) | |
2b188cc1 | 1641 | { |
78e19bbe | 1642 | struct io_ring_ctx *ctx = req->ctx; |
2b188cc1 JA |
1643 | unsigned long flags; |
1644 | ||
1645 | spin_lock_irqsave(&ctx->completion_lock, flags); | |
d4d19c19 | 1646 | __io_cqring_fill_event(ctx, req->user_data, res, cflags); |
c7dae4ba JA |
1647 | /* |
1648 | * If we're the last reference to this request, add to our locked | |
1649 | * free_list cache. | |
1650 | */ | |
de9b4cca | 1651 | if (req_ref_put_and_test(req)) { |
7a612350 | 1652 | if (req->flags & (REQ_F_LINK | REQ_F_HARDLINK)) { |
93d2bcd2 | 1653 | if (req->flags & (REQ_F_LINK_TIMEOUT | REQ_F_FAIL)) |
7a612350 PB |
1654 | io_disarm_next(req); |
1655 | if (req->link) { | |
1656 | io_req_task_queue(req->link); | |
1657 | req->link = NULL; | |
1658 | } | |
1659 | } | |
c7dae4ba JA |
1660 | io_dismantle_req(req); |
1661 | io_put_task(req->task, 1); | |
d0acdee2 PB |
1662 | list_add(&req->compl.list, &ctx->locked_free_list); |
1663 | ctx->locked_free_nr++; | |
180f829f PB |
1664 | } else { |
1665 | if (!percpu_ref_tryget(&ctx->refs)) | |
1666 | req = NULL; | |
1667 | } | |
7a612350 | 1668 | io_commit_cqring(ctx); |
2b188cc1 | 1669 | spin_unlock_irqrestore(&ctx->completion_lock, flags); |
7a612350 | 1670 | |
180f829f PB |
1671 | if (req) { |
1672 | io_cqring_ev_posted(ctx); | |
c7dae4ba | 1673 | percpu_ref_put(&ctx->refs); |
180f829f | 1674 | } |
229a7b63 JA |
1675 | } |
1676 | ||
4e3d9ff9 JA |
1677 | static inline bool io_req_needs_clean(struct io_kiocb *req) |
1678 | { | |
c854357b | 1679 | return req->flags & IO_REQ_CLEAN_FLAGS; |
4e3d9ff9 JA |
1680 | } |
1681 | ||
a38d68db | 1682 | static void io_req_complete_state(struct io_kiocb *req, long res, |
889fca73 | 1683 | unsigned int cflags) |
229a7b63 | 1684 | { |
4e3d9ff9 | 1685 | if (io_req_needs_clean(req)) |
68fb8979 | 1686 | io_clean_op(req); |
a38d68db PB |
1687 | req->result = res; |
1688 | req->compl.cflags = cflags; | |
e342c807 | 1689 | req->flags |= REQ_F_COMPLETE_INLINE; |
e1e16097 JA |
1690 | } |
1691 | ||
889fca73 PB |
1692 | static inline void __io_req_complete(struct io_kiocb *req, unsigned issue_flags, |
1693 | long res, unsigned cflags) | |
bcda7baa | 1694 | { |
889fca73 PB |
1695 | if (issue_flags & IO_URING_F_COMPLETE_DEFER) |
1696 | io_req_complete_state(req, res, cflags); | |
a38d68db | 1697 | else |
c7dae4ba | 1698 | io_req_complete_post(req, res, cflags); |
bcda7baa JA |
1699 | } |
1700 | ||
a38d68db | 1701 | static inline void io_req_complete(struct io_kiocb *req, long res) |
0ddf92e8 | 1702 | { |
889fca73 | 1703 | __io_req_complete(req, 0, res, 0); |
0ddf92e8 JA |
1704 | } |
1705 | ||
f41db273 PB |
1706 | static void io_req_complete_failed(struct io_kiocb *req, long res) |
1707 | { | |
93d2bcd2 | 1708 | req_set_fail(req); |
f41db273 PB |
1709 | io_put_req(req); |
1710 | io_req_complete_post(req, res, 0); | |
1711 | } | |
1712 | ||
864ea921 PB |
1713 | /* |
1714 | * Don't initialise the fields below on every allocation, but do that in | |
1715 | * advance and keep them valid across allocations. | |
1716 | */ | |
1717 | static void io_preinit_req(struct io_kiocb *req, struct io_ring_ctx *ctx) | |
1718 | { | |
1719 | req->ctx = ctx; | |
1720 | req->link = NULL; | |
1721 | req->async_data = NULL; | |
1722 | /* not necessary, but safer to zero */ | |
1723 | req->result = 0; | |
1724 | } | |
1725 | ||
dac7a098 PB |
1726 | static void io_flush_cached_locked_reqs(struct io_ring_ctx *ctx, |
1727 | struct io_comp_state *cs) | |
1728 | { | |
1729 | spin_lock_irq(&ctx->completion_lock); | |
d0acdee2 PB |
1730 | list_splice_init(&ctx->locked_free_list, &cs->free_list); |
1731 | ctx->locked_free_nr = 0; | |
dac7a098 PB |
1732 | spin_unlock_irq(&ctx->completion_lock); |
1733 | } | |
1734 | ||
dd78f492 | 1735 | /* Returns true IFF there are requests in the cache */ |
c7dae4ba | 1736 | static bool io_flush_cached_reqs(struct io_ring_ctx *ctx) |
0ddf92e8 | 1737 | { |
c7dae4ba JA |
1738 | struct io_submit_state *state = &ctx->submit_state; |
1739 | struct io_comp_state *cs = &state->comp; | |
dd78f492 | 1740 | int nr; |
0ddf92e8 | 1741 | |
c7dae4ba JA |
1742 | /* |
1743 | * If we have more than a batch's worth of requests in our IRQ side | |
1744 | * locked cache, grab the lock and move them over to our submission | |
1745 | * side cache. | |
1746 | */ | |
d0acdee2 | 1747 | if (READ_ONCE(ctx->locked_free_nr) > IO_COMPL_BATCH) |
dac7a098 | 1748 | io_flush_cached_locked_reqs(ctx, cs); |
0ddf92e8 | 1749 | |
dd78f492 | 1750 | nr = state->free_reqs; |
c7dae4ba | 1751 | while (!list_empty(&cs->free_list)) { |
dd78f492 PB |
1752 | struct io_kiocb *req = list_first_entry(&cs->free_list, |
1753 | struct io_kiocb, compl.list); | |
1754 | ||
1b4c351f | 1755 | list_del(&req->compl.list); |
dd78f492 PB |
1756 | state->reqs[nr++] = req; |
1757 | if (nr == ARRAY_SIZE(state->reqs)) | |
e5d1bc0a | 1758 | break; |
1b4c351f JA |
1759 | } |
1760 | ||
dd78f492 PB |
1761 | state->free_reqs = nr; |
1762 | return nr != 0; | |
0ddf92e8 JA |
1763 | } |
1764 | ||
e5d1bc0a | 1765 | static struct io_kiocb *io_alloc_req(struct io_ring_ctx *ctx) |
2b188cc1 | 1766 | { |
e5d1bc0a | 1767 | struct io_submit_state *state = &ctx->submit_state; |
864ea921 PB |
1768 | gfp_t gfp = GFP_KERNEL | __GFP_NOWARN; |
1769 | int ret, i; | |
e5d1bc0a | 1770 | |
fe7e3257 | 1771 | BUILD_BUG_ON(ARRAY_SIZE(state->reqs) < IO_REQ_ALLOC_BATCH); |
e5d1bc0a | 1772 | |
864ea921 PB |
1773 | if (likely(state->free_reqs || io_flush_cached_reqs(ctx))) |
1774 | goto got_req; | |
e5d1bc0a | 1775 | |
864ea921 PB |
1776 | ret = kmem_cache_alloc_bulk(req_cachep, gfp, IO_REQ_ALLOC_BATCH, |
1777 | state->reqs); | |
fd6fab2c | 1778 | |
864ea921 PB |
1779 | /* |
1780 | * Bulk alloc is all-or-nothing. If we fail to get a batch, | |
1781 | * retry single alloc to be on the safe side. | |
1782 | */ | |
1783 | if (unlikely(ret <= 0)) { | |
1784 | state->reqs[0] = kmem_cache_alloc(req_cachep, gfp); | |
1785 | if (!state->reqs[0]) | |
1786 | return NULL; | |
1787 | ret = 1; | |
2b188cc1 | 1788 | } |
864ea921 PB |
1789 | |
1790 | for (i = 0; i < ret; i++) | |
1791 | io_preinit_req(state->reqs[i], ctx); | |
1792 | state->free_reqs = ret; | |
e5d1bc0a | 1793 | got_req: |
291b2821 PB |
1794 | state->free_reqs--; |
1795 | return state->reqs[state->free_reqs]; | |
2b188cc1 JA |
1796 | } |
1797 | ||
e1d767f0 | 1798 | static inline void io_put_file(struct file *file) |
8da11c19 | 1799 | { |
e1d767f0 | 1800 | if (file) |
8da11c19 PB |
1801 | fput(file); |
1802 | } | |
1803 | ||
4edf20f9 | 1804 | static void io_dismantle_req(struct io_kiocb *req) |
2b188cc1 | 1805 | { |
094bae49 | 1806 | unsigned int flags = req->flags; |
929a3af9 | 1807 | |
3a0a6902 PB |
1808 | if (io_req_needs_clean(req)) |
1809 | io_clean_op(req); | |
e1d767f0 PB |
1810 | if (!(flags & REQ_F_FIXED_FILE)) |
1811 | io_put_file(req->file); | |
269bbe5f BM |
1812 | if (req->fixed_rsrc_refs) |
1813 | percpu_ref_put(req->fixed_rsrc_refs); | |
99ebe4ef | 1814 | if (req->async_data) { |
094bae49 | 1815 | kfree(req->async_data); |
99ebe4ef PB |
1816 | req->async_data = NULL; |
1817 | } | |
e65ef56d JA |
1818 | } |
1819 | ||
216578e5 | 1820 | static void __io_free_req(struct io_kiocb *req) |
c6ca97b3 | 1821 | { |
51a4cc11 | 1822 | struct io_ring_ctx *ctx = req->ctx; |
c6ca97b3 | 1823 | |
216578e5 | 1824 | io_dismantle_req(req); |
7c660731 | 1825 | io_put_task(req->task, 1); |
c6ca97b3 | 1826 | |
3893f39f | 1827 | kmem_cache_free(req_cachep, req); |
ecfc5177 | 1828 | percpu_ref_put(&ctx->refs); |
e65ef56d JA |
1829 | } |
1830 | ||
f2f87370 PB |
1831 | static inline void io_remove_next_linked(struct io_kiocb *req) |
1832 | { | |
1833 | struct io_kiocb *nxt = req->link; | |
1834 | ||
1835 | req->link = nxt->link; | |
1836 | nxt->link = NULL; | |
1837 | } | |
1838 | ||
33cc89a9 PB |
1839 | static bool io_kill_linked_timeout(struct io_kiocb *req) |
1840 | __must_hold(&req->ctx->completion_lock) | |
2665abfd | 1841 | { |
33cc89a9 | 1842 | struct io_kiocb *link = req->link; |
f2f87370 | 1843 | |
900fad45 PB |
1844 | /* |
1845 | * Can happen if a linked timeout fired and link had been like | |
1846 | * req -> link t-out -> link t-out [-> ...] | |
1847 | */ | |
c9abd7ad PB |
1848 | if (link && (link->flags & REQ_F_LTIMEOUT_ACTIVE)) { |
1849 | struct io_timeout_data *io = link->async_data; | |
7c86ffee | 1850 | |
f2f87370 | 1851 | io_remove_next_linked(req); |
90cd7e42 | 1852 | link->timeout.head = NULL; |
fd9c7bc5 | 1853 | if (hrtimer_try_to_cancel(&io->timer) != -1) { |
d4d19c19 PB |
1854 | io_cqring_fill_event(link->ctx, link->user_data, |
1855 | -ECANCELED, 0); | |
33cc89a9 | 1856 | io_put_req_deferred(link, 1); |
d4729fbd | 1857 | return true; |
c9abd7ad PB |
1858 | } |
1859 | } | |
d4729fbd | 1860 | return false; |
7c86ffee PB |
1861 | } |
1862 | ||
d148ca4b | 1863 | static void io_fail_links(struct io_kiocb *req) |
33cc89a9 | 1864 | __must_hold(&req->ctx->completion_lock) |
9e645e11 | 1865 | { |
33cc89a9 | 1866 | struct io_kiocb *nxt, *link = req->link; |
9e645e11 | 1867 | |
f2f87370 | 1868 | req->link = NULL; |
f2f87370 PB |
1869 | while (link) { |
1870 | nxt = link->link; | |
1871 | link->link = NULL; | |
2665abfd | 1872 | |
f2f87370 | 1873 | trace_io_uring_fail_link(req, link); |
d4d19c19 | 1874 | io_cqring_fill_event(link->ctx, link->user_data, -ECANCELED, 0); |
1575f21a | 1875 | io_put_req_deferred(link, 2); |
f2f87370 | 1876 | link = nxt; |
9e645e11 | 1877 | } |
33cc89a9 | 1878 | } |
9e645e11 | 1879 | |
33cc89a9 PB |
1880 | static bool io_disarm_next(struct io_kiocb *req) |
1881 | __must_hold(&req->ctx->completion_lock) | |
1882 | { | |
1883 | bool posted = false; | |
1884 | ||
1885 | if (likely(req->flags & REQ_F_LINK_TIMEOUT)) | |
1886 | posted = io_kill_linked_timeout(req); | |
93d2bcd2 | 1887 | if (unlikely((req->flags & REQ_F_FAIL) && |
e4335ed3 | 1888 | !(req->flags & REQ_F_HARDLINK))) { |
33cc89a9 PB |
1889 | posted |= (req->link != NULL); |
1890 | io_fail_links(req); | |
1891 | } | |
1892 | return posted; | |
9e645e11 JA |
1893 | } |
1894 | ||
3fa5e0f3 | 1895 | static struct io_kiocb *__io_req_find_next(struct io_kiocb *req) |
c69f8dbe | 1896 | { |
33cc89a9 | 1897 | struct io_kiocb *nxt; |
944e58bf | 1898 | |
9e645e11 JA |
1899 | /* |
1900 | * If LINK is set, we have dependent requests in this chain. If we | |
1901 | * didn't fail this request, queue the first one up, moving any other | |
1902 | * dependencies to the next request. In case of failure, fail the rest | |
1903 | * of the chain. | |
1904 | */ | |
93d2bcd2 | 1905 | if (req->flags & (REQ_F_LINK_TIMEOUT | REQ_F_FAIL)) { |
33cc89a9 PB |
1906 | struct io_ring_ctx *ctx = req->ctx; |
1907 | unsigned long flags; | |
1908 | bool posted; | |
1909 | ||
1910 | spin_lock_irqsave(&ctx->completion_lock, flags); | |
1911 | posted = io_disarm_next(req); | |
1912 | if (posted) | |
1913 | io_commit_cqring(req->ctx); | |
1914 | spin_unlock_irqrestore(&ctx->completion_lock, flags); | |
1915 | if (posted) | |
1916 | io_cqring_ev_posted(ctx); | |
f2f87370 | 1917 | } |
33cc89a9 PB |
1918 | nxt = req->link; |
1919 | req->link = NULL; | |
1920 | return nxt; | |
4d7dd462 | 1921 | } |
9e645e11 | 1922 | |
f2f87370 | 1923 | static inline struct io_kiocb *io_req_find_next(struct io_kiocb *req) |
3fa5e0f3 | 1924 | { |
cdbff982 | 1925 | if (likely(!(req->flags & (REQ_F_LINK|REQ_F_HARDLINK)))) |
3fa5e0f3 PB |
1926 | return NULL; |
1927 | return __io_req_find_next(req); | |
1928 | } | |
1929 | ||
2c32395d PB |
1930 | static void ctx_flush_and_put(struct io_ring_ctx *ctx) |
1931 | { | |
1932 | if (!ctx) | |
1933 | return; | |
1934 | if (ctx->submit_state.comp.nr) { | |
1935 | mutex_lock(&ctx->uring_lock); | |
2a2758f2 | 1936 | io_submit_flush_completions(ctx); |
2c32395d PB |
1937 | mutex_unlock(&ctx->uring_lock); |
1938 | } | |
1939 | percpu_ref_put(&ctx->refs); | |
1940 | } | |
1941 | ||
7cbf1722 | 1942 | static void tctx_task_work(struct callback_head *cb) |
c40f6379 | 1943 | { |
ebd0df2e | 1944 | struct io_ring_ctx *ctx = NULL; |
3f18407d PB |
1945 | struct io_uring_task *tctx = container_of(cb, struct io_uring_task, |
1946 | task_work); | |
c40f6379 | 1947 | |
16f72070 | 1948 | while (1) { |
3f18407d PB |
1949 | struct io_wq_work_node *node; |
1950 | ||
1951 | spin_lock_irq(&tctx->task_lock); | |
c6538be9 | 1952 | node = tctx->task_list.first; |
3f18407d PB |
1953 | INIT_WQ_LIST(&tctx->task_list); |
1954 | spin_unlock_irq(&tctx->task_lock); | |
1955 | ||
3f18407d PB |
1956 | while (node) { |
1957 | struct io_wq_work_node *next = node->next; | |
1958 | struct io_kiocb *req = container_of(node, struct io_kiocb, | |
1959 | io_task_work.node); | |
1960 | ||
1961 | if (req->ctx != ctx) { | |
1962 | ctx_flush_and_put(ctx); | |
1963 | ctx = req->ctx; | |
1964 | percpu_ref_get(&ctx->refs); | |
1965 | } | |
5b0a6acc | 1966 | req->io_task_work.func(req); |
3f18407d PB |
1967 | node = next; |
1968 | } | |
7a778f9d | 1969 | if (wq_list_empty(&tctx->task_list)) { |
110aa25c | 1970 | spin_lock_irq(&tctx->task_lock); |
7a778f9d | 1971 | clear_bit(0, &tctx->task_state); |
110aa25c JA |
1972 | if (wq_list_empty(&tctx->task_list)) { |
1973 | spin_unlock_irq(&tctx->task_lock); | |
7a778f9d | 1974 | break; |
110aa25c JA |
1975 | } |
1976 | spin_unlock_irq(&tctx->task_lock); | |
7a778f9d PB |
1977 | /* another tctx_task_work() is enqueued, yield */ |
1978 | if (test_and_set_bit(0, &tctx->task_state)) | |
1979 | break; | |
1980 | } | |
7cbf1722 | 1981 | cond_resched(); |
3f18407d | 1982 | } |
ebd0df2e PB |
1983 | |
1984 | ctx_flush_and_put(ctx); | |
7cbf1722 JA |
1985 | } |
1986 | ||
e09ee510 | 1987 | static void io_req_task_work_add(struct io_kiocb *req) |
7cbf1722 | 1988 | { |
c15b79de | 1989 | struct task_struct *tsk = req->task; |
7cbf1722 | 1990 | struct io_uring_task *tctx = tsk->io_uring; |
c15b79de | 1991 | enum task_work_notify_mode notify; |
e09ee510 | 1992 | struct io_wq_work_node *node; |
0b81e80c | 1993 | unsigned long flags; |
7cbf1722 JA |
1994 | |
1995 | WARN_ON_ONCE(!tctx); | |
1996 | ||
0b81e80c | 1997 | spin_lock_irqsave(&tctx->task_lock, flags); |
7cbf1722 | 1998 | wq_list_add_tail(&req->io_task_work.node, &tctx->task_list); |
0b81e80c | 1999 | spin_unlock_irqrestore(&tctx->task_lock, flags); |
7cbf1722 JA |
2000 | |
2001 | /* task_work already pending, we're done */ | |
2002 | if (test_bit(0, &tctx->task_state) || | |
2003 | test_and_set_bit(0, &tctx->task_state)) | |
e09ee510 | 2004 | return; |
7cbf1722 | 2005 | |
c15b79de PB |
2006 | /* |
2007 | * SQPOLL kernel thread doesn't need notification, just a wakeup. For | |
2008 | * all other cases, use TWA_SIGNAL unconditionally to ensure we're | |
2009 | * processing task_work. There's no reliable way to tell if TWA_RESUME | |
2010 | * will do the job. | |
2011 | */ | |
2012 | notify = (req->ctx->flags & IORING_SETUP_SQPOLL) ? TWA_NONE : TWA_SIGNAL; | |
c15b79de PB |
2013 | if (!task_work_add(tsk, &tctx->task_work, notify)) { |
2014 | wake_up_process(tsk); | |
e09ee510 | 2015 | return; |
c15b79de | 2016 | } |
2215bed9 | 2017 | |
e09ee510 | 2018 | clear_bit(0, &tctx->task_state); |
0b81e80c | 2019 | spin_lock_irqsave(&tctx->task_lock, flags); |
e09ee510 PB |
2020 | node = tctx->task_list.first; |
2021 | INIT_WQ_LIST(&tctx->task_list); | |
0b81e80c | 2022 | spin_unlock_irqrestore(&tctx->task_lock, flags); |
7cbf1722 | 2023 | |
e09ee510 PB |
2024 | while (node) { |
2025 | req = container_of(node, struct io_kiocb, io_task_work.node); | |
2026 | node = node->next; | |
2027 | if (llist_add(&req->io_task_work.fallback_node, | |
2028 | &req->ctx->fallback_llist)) | |
2029 | schedule_delayed_work(&req->ctx->fallback_work, 1); | |
2030 | } | |
eab30c4d PB |
2031 | } |
2032 | ||
5b0a6acc | 2033 | static void io_req_task_cancel(struct io_kiocb *req) |
c40f6379 | 2034 | { |
87ceb6a6 | 2035 | struct io_ring_ctx *ctx = req->ctx; |
c40f6379 | 2036 | |
e83acd7d | 2037 | /* ctx is guaranteed to stay alive while we hold uring_lock */ |
792bb6eb | 2038 | mutex_lock(&ctx->uring_lock); |
2593553a | 2039 | io_req_complete_failed(req, req->result); |
792bb6eb | 2040 | mutex_unlock(&ctx->uring_lock); |
c40f6379 JA |
2041 | } |
2042 | ||
5b0a6acc | 2043 | static void io_req_task_submit(struct io_kiocb *req) |
c40f6379 JA |
2044 | { |
2045 | struct io_ring_ctx *ctx = req->ctx; | |
2046 | ||
04fc6c80 | 2047 | /* ctx stays valid until unlock, even if we drop all ours ctx->refs */ |
81b6d05c | 2048 | mutex_lock(&ctx->uring_lock); |
9c688260 | 2049 | if (!(req->task->flags & PF_EXITING) && !req->task->in_execve) |
c5eef2b9 | 2050 | __io_queue_sqe(req); |
81b6d05c | 2051 | else |
2593553a | 2052 | io_req_complete_failed(req, -EFAULT); |
81b6d05c | 2053 | mutex_unlock(&ctx->uring_lock); |
c40f6379 JA |
2054 | } |
2055 | ||
2c4b8eb6 | 2056 | static void io_req_task_queue_fail(struct io_kiocb *req, int ret) |
c40f6379 | 2057 | { |
2c4b8eb6 | 2058 | req->result = ret; |
5b0a6acc | 2059 | req->io_task_work.func = io_req_task_cancel; |
e09ee510 | 2060 | io_req_task_work_add(req); |
c40f6379 JA |
2061 | } |
2062 | ||
2c4b8eb6 | 2063 | static void io_req_task_queue(struct io_kiocb *req) |
a3df7698 | 2064 | { |
5b0a6acc | 2065 | req->io_task_work.func = io_req_task_submit; |
e09ee510 | 2066 | io_req_task_work_add(req); |
a3df7698 PB |
2067 | } |
2068 | ||
773af691 JA |
2069 | static void io_req_task_queue_reissue(struct io_kiocb *req) |
2070 | { | |
2071 | req->io_task_work.func = io_queue_async_work; | |
2072 | io_req_task_work_add(req); | |
2073 | } | |
2074 | ||
f2f87370 | 2075 | static inline void io_queue_next(struct io_kiocb *req) |
c69f8dbe | 2076 | { |
9b5f7bd9 | 2077 | struct io_kiocb *nxt = io_req_find_next(req); |
944e58bf PB |
2078 | |
2079 | if (nxt) | |
906a8c3f | 2080 | io_req_task_queue(nxt); |
c69f8dbe JL |
2081 | } |
2082 | ||
c3524383 | 2083 | static void io_free_req(struct io_kiocb *req) |
7a743e22 | 2084 | { |
c3524383 PB |
2085 | io_queue_next(req); |
2086 | __io_free_req(req); | |
2087 | } | |
8766dd51 | 2088 | |
2d6500d4 | 2089 | struct req_batch { |
5af1d13e PB |
2090 | struct task_struct *task; |
2091 | int task_refs; | |
1b4c351f | 2092 | int ctx_refs; |
2d6500d4 PB |
2093 | }; |
2094 | ||
5af1d13e PB |
2095 | static inline void io_init_req_batch(struct req_batch *rb) |
2096 | { | |
5af1d13e | 2097 | rb->task_refs = 0; |
9ae72463 | 2098 | rb->ctx_refs = 0; |
5af1d13e PB |
2099 | rb->task = NULL; |
2100 | } | |
2101 | ||
2d6500d4 PB |
2102 | static void io_req_free_batch_finish(struct io_ring_ctx *ctx, |
2103 | struct req_batch *rb) | |
2104 | { | |
6e833d53 | 2105 | if (rb->task) |
7c660731 | 2106 | io_put_task(rb->task, rb->task_refs); |
9ae72463 PB |
2107 | if (rb->ctx_refs) |
2108 | percpu_ref_put_many(&ctx->refs, rb->ctx_refs); | |
2d6500d4 PB |
2109 | } |
2110 | ||
6ff119a6 PB |
2111 | static void io_req_free_batch(struct req_batch *rb, struct io_kiocb *req, |
2112 | struct io_submit_state *state) | |
2d6500d4 | 2113 | { |
f2f87370 | 2114 | io_queue_next(req); |
96670657 | 2115 | io_dismantle_req(req); |
2d6500d4 | 2116 | |
e3bc8e9d | 2117 | if (req->task != rb->task) { |
7c660731 PB |
2118 | if (rb->task) |
2119 | io_put_task(rb->task, rb->task_refs); | |
e3bc8e9d JA |
2120 | rb->task = req->task; |
2121 | rb->task_refs = 0; | |
5af1d13e | 2122 | } |
e3bc8e9d | 2123 | rb->task_refs++; |
9ae72463 | 2124 | rb->ctx_refs++; |
5af1d13e | 2125 | |
bd759045 | 2126 | if (state->free_reqs != ARRAY_SIZE(state->reqs)) |
6ff119a6 | 2127 | state->reqs[state->free_reqs++] = req; |
bd759045 PB |
2128 | else |
2129 | list_add(&req->compl.list, &state->comp.free_list); | |
7a743e22 PB |
2130 | } |
2131 | ||
2a2758f2 | 2132 | static void io_submit_flush_completions(struct io_ring_ctx *ctx) |
282cdc86 | 2133 | __must_hold(&req->ctx->uring_lock) |
905c172f | 2134 | { |
2a2758f2 | 2135 | struct io_comp_state *cs = &ctx->submit_state.comp; |
905c172f | 2136 | int i, nr = cs->nr; |
905c172f PB |
2137 | struct req_batch rb; |
2138 | ||
905c172f PB |
2139 | spin_lock_irq(&ctx->completion_lock); |
2140 | for (i = 0; i < nr; i++) { | |
5182ed2e PB |
2141 | struct io_kiocb *req = cs->reqs[i]; |
2142 | ||
d4d19c19 PB |
2143 | __io_cqring_fill_event(ctx, req->user_data, req->result, |
2144 | req->compl.cflags); | |
905c172f PB |
2145 | } |
2146 | io_commit_cqring(ctx); | |
2147 | spin_unlock_irq(&ctx->completion_lock); | |
905c172f | 2148 | io_cqring_ev_posted(ctx); |
5182ed2e PB |
2149 | |
2150 | io_init_req_batch(&rb); | |
905c172f | 2151 | for (i = 0; i < nr; i++) { |
5182ed2e | 2152 | struct io_kiocb *req = cs->reqs[i]; |
905c172f PB |
2153 | |
2154 | /* submission and completion refs */ | |
de9b4cca | 2155 | if (req_ref_sub_and_test(req, 2)) |
6ff119a6 | 2156 | io_req_free_batch(&rb, req, &ctx->submit_state); |
905c172f PB |
2157 | } |
2158 | ||
2159 | io_req_free_batch_finish(ctx, &rb); | |
2160 | cs->nr = 0; | |
7a743e22 PB |
2161 | } |
2162 | ||
ba816ad6 JA |
2163 | /* |
2164 | * Drop reference to request, return next in chain (if there is one) if this | |
2165 | * was the last reference to this request. | |
2166 | */ | |
0d85035a | 2167 | static inline struct io_kiocb *io_put_req_find_next(struct io_kiocb *req) |
e65ef56d | 2168 | { |
9b5f7bd9 PB |
2169 | struct io_kiocb *nxt = NULL; |
2170 | ||
de9b4cca | 2171 | if (req_ref_put_and_test(req)) { |
9b5f7bd9 | 2172 | nxt = io_req_find_next(req); |
4d7dd462 | 2173 | __io_free_req(req); |
2a44f467 | 2174 | } |
9b5f7bd9 | 2175 | return nxt; |
2b188cc1 JA |
2176 | } |
2177 | ||
0d85035a | 2178 | static inline void io_put_req(struct io_kiocb *req) |
e65ef56d | 2179 | { |
de9b4cca | 2180 | if (req_ref_put_and_test(req)) |
e65ef56d | 2181 | io_free_req(req); |
2b188cc1 JA |
2182 | } |
2183 | ||
216578e5 PB |
2184 | static inline void io_put_req_deferred(struct io_kiocb *req, int refs) |
2185 | { | |
543af3a1 PB |
2186 | if (req_ref_sub_and_test(req, refs)) { |
2187 | req->io_task_work.func = io_free_req; | |
2188 | io_req_task_work_add(req); | |
2189 | } | |
216578e5 PB |
2190 | } |
2191 | ||
6c503150 | 2192 | static unsigned io_cqring_events(struct io_ring_ctx *ctx) |
a3a0e43f JA |
2193 | { |
2194 | /* See comment at the top of this file */ | |
2195 | smp_rmb(); | |
e23de15f | 2196 | return __io_cqring_events(ctx); |
a3a0e43f JA |
2197 | } |
2198 | ||
fb5ccc98 PB |
2199 | static inline unsigned int io_sqring_entries(struct io_ring_ctx *ctx) |
2200 | { | |
2201 | struct io_rings *rings = ctx->rings; | |
2202 | ||
2203 | /* make sure SQ entry isn't read before tail */ | |
2204 | return smp_load_acquire(&rings->sq.tail) - ctx->cached_sq_head; | |
2205 | } | |
2206 | ||
8ff069bf | 2207 | static unsigned int io_put_kbuf(struct io_kiocb *req, struct io_buffer *kbuf) |
e94f141b | 2208 | { |
8ff069bf | 2209 | unsigned int cflags; |
e94f141b | 2210 | |
bcda7baa JA |
2211 | cflags = kbuf->bid << IORING_CQE_BUFFER_SHIFT; |
2212 | cflags |= IORING_CQE_F_BUFFER; | |
0e1b6fe3 | 2213 | req->flags &= ~REQ_F_BUFFER_SELECTED; |
bcda7baa JA |
2214 | kfree(kbuf); |
2215 | return cflags; | |
e94f141b JA |
2216 | } |
2217 | ||
8ff069bf | 2218 | static inline unsigned int io_put_rw_kbuf(struct io_kiocb *req) |
bcda7baa | 2219 | { |
4d954c25 | 2220 | struct io_buffer *kbuf; |
bcda7baa | 2221 | |
4d954c25 | 2222 | kbuf = (struct io_buffer *) (unsigned long) req->rw.addr; |
8ff069bf PB |
2223 | return io_put_kbuf(req, kbuf); |
2224 | } | |
2225 | ||
4c6e277c JA |
2226 | static inline bool io_run_task_work(void) |
2227 | { | |
ef98eb04 | 2228 | if (test_thread_flag(TIF_NOTIFY_SIGNAL) || current->task_works) { |
4c6e277c | 2229 | __set_current_state(TASK_RUNNING); |
ef98eb04 | 2230 | tracehook_notify_signal(); |
4c6e277c JA |
2231 | return true; |
2232 | } | |
2233 | ||
2234 | return false; | |
bcda7baa JA |
2235 | } |
2236 | ||
def596e9 JA |
2237 | /* |
2238 | * Find and free completed poll iocbs | |
2239 | */ | |
2240 | static void io_iopoll_complete(struct io_ring_ctx *ctx, unsigned int *nr_events, | |
3c30ef0f | 2241 | struct list_head *done, bool resubmit) |
def596e9 | 2242 | { |
8237e045 | 2243 | struct req_batch rb; |
def596e9 | 2244 | struct io_kiocb *req; |
bbde017a XW |
2245 | |
2246 | /* order with ->result store in io_complete_rw_iopoll() */ | |
2247 | smp_rmb(); | |
def596e9 | 2248 | |
5af1d13e | 2249 | io_init_req_batch(&rb); |
def596e9 | 2250 | while (!list_empty(done)) { |
bcda7baa JA |
2251 | int cflags = 0; |
2252 | ||
d21ffe7e | 2253 | req = list_first_entry(done, struct io_kiocb, inflight_entry); |
f161340d PB |
2254 | list_del(&req->inflight_entry); |
2255 | ||
3c30ef0f | 2256 | if (READ_ONCE(req->result) == -EAGAIN && resubmit && |
8c130827 | 2257 | !(req->flags & REQ_F_DONT_REISSUE)) { |
bbde017a | 2258 | req->iopoll_completed = 0; |
8c130827 | 2259 | req_ref_get(req); |
773af691 | 2260 | io_req_task_queue_reissue(req); |
8c130827 | 2261 | continue; |
bbde017a | 2262 | } |
def596e9 | 2263 | |
bcda7baa | 2264 | if (req->flags & REQ_F_BUFFER_SELECTED) |
8ff069bf | 2265 | cflags = io_put_rw_kbuf(req); |
bcda7baa | 2266 | |
d4d19c19 | 2267 | __io_cqring_fill_event(ctx, req->user_data, req->result, cflags); |
def596e9 JA |
2268 | (*nr_events)++; |
2269 | ||
de9b4cca | 2270 | if (req_ref_put_and_test(req)) |
6ff119a6 | 2271 | io_req_free_batch(&rb, req, &ctx->submit_state); |
def596e9 | 2272 | } |
def596e9 | 2273 | |
09bb8394 | 2274 | io_commit_cqring(ctx); |
80c18e4a | 2275 | io_cqring_ev_posted_iopoll(ctx); |
2d6500d4 | 2276 | io_req_free_batch_finish(ctx, &rb); |
581f9810 BM |
2277 | } |
2278 | ||
def596e9 | 2279 | static int io_do_iopoll(struct io_ring_ctx *ctx, unsigned int *nr_events, |
3c30ef0f | 2280 | long min, bool resubmit) |
def596e9 JA |
2281 | { |
2282 | struct io_kiocb *req, *tmp; | |
2283 | LIST_HEAD(done); | |
2284 | bool spin; | |
def596e9 JA |
2285 | |
2286 | /* | |
2287 | * Only spin for completions if we don't have multiple devices hanging | |
2288 | * off our complete list, and we're under the requested amount. | |
2289 | */ | |
915b3dde | 2290 | spin = !ctx->poll_multi_queue && *nr_events < min; |
def596e9 | 2291 | |
d21ffe7e | 2292 | list_for_each_entry_safe(req, tmp, &ctx->iopoll_list, inflight_entry) { |
9adbd45d | 2293 | struct kiocb *kiocb = &req->rw.kiocb; |
a2416e1e | 2294 | int ret; |
def596e9 JA |
2295 | |
2296 | /* | |
581f9810 BM |
2297 | * Move completed and retryable entries to our local lists. |
2298 | * If we find a request that requires polling, break out | |
2299 | * and complete those lists first, if we have entries there. | |
def596e9 | 2300 | */ |
65a6543d | 2301 | if (READ_ONCE(req->iopoll_completed)) { |
d21ffe7e | 2302 | list_move_tail(&req->inflight_entry, &done); |
def596e9 JA |
2303 | continue; |
2304 | } | |
2305 | if (!list_empty(&done)) | |
2306 | break; | |
2307 | ||
2308 | ret = kiocb->ki_filp->f_op->iopoll(kiocb, spin); | |
a2416e1e PB |
2309 | if (unlikely(ret < 0)) |
2310 | return ret; | |
2311 | else if (ret) | |
2312 | spin = false; | |
def596e9 | 2313 | |
3aadc23e PB |
2314 | /* iopoll may have completed current req */ |
2315 | if (READ_ONCE(req->iopoll_completed)) | |
d21ffe7e | 2316 | list_move_tail(&req->inflight_entry, &done); |
def596e9 JA |
2317 | } |
2318 | ||
2319 | if (!list_empty(&done)) | |
3c30ef0f | 2320 | io_iopoll_complete(ctx, nr_events, &done, resubmit); |
def596e9 | 2321 | |
a2416e1e | 2322 | return 0; |
def596e9 JA |
2323 | } |
2324 | ||
def596e9 JA |
2325 | /* |
2326 | * We can't just wait for polled events to come to us, we have to actively | |
2327 | * find and complete them. | |
2328 | */ | |
b2edc0a7 | 2329 | static void io_iopoll_try_reap_events(struct io_ring_ctx *ctx) |
def596e9 JA |
2330 | { |
2331 | if (!(ctx->flags & IORING_SETUP_IOPOLL)) | |
2332 | return; | |
2333 | ||
2334 | mutex_lock(&ctx->uring_lock); | |
540e32a0 | 2335 | while (!list_empty(&ctx->iopoll_list)) { |
def596e9 JA |
2336 | unsigned int nr_events = 0; |
2337 | ||
3c30ef0f | 2338 | io_do_iopoll(ctx, &nr_events, 0, false); |
08f5439f | 2339 | |
b2edc0a7 PB |
2340 | /* let it sleep and repeat later if can't complete a request */ |
2341 | if (nr_events == 0) | |
2342 | break; | |
08f5439f JA |
2343 | /* |
2344 | * Ensure we allow local-to-the-cpu processing to take place, | |
2345 | * in this case we need to ensure that we reap all events. | |
3fcee5a6 | 2346 | * Also let task_work, etc. to progress by releasing the mutex |
08f5439f | 2347 | */ |
3fcee5a6 PB |
2348 | if (need_resched()) { |
2349 | mutex_unlock(&ctx->uring_lock); | |
2350 | cond_resched(); | |
2351 | mutex_lock(&ctx->uring_lock); | |
2352 | } | |
def596e9 JA |
2353 | } |
2354 | mutex_unlock(&ctx->uring_lock); | |
2355 | } | |
2356 | ||
7668b92a | 2357 | static int io_iopoll_check(struct io_ring_ctx *ctx, long min) |
def596e9 | 2358 | { |
7668b92a | 2359 | unsigned int nr_events = 0; |
e9979b36 | 2360 | int ret = 0; |
500f9fba | 2361 | |
c7849be9 XW |
2362 | /* |
2363 | * We disallow the app entering submit/complete with polling, but we | |
2364 | * still need to lock the ring to prevent racing with polled issue | |
2365 | * that got punted to a workqueue. | |
2366 | */ | |
2367 | mutex_lock(&ctx->uring_lock); | |
f39c8a5b PB |
2368 | /* |
2369 | * Don't enter poll loop if we already have events pending. | |
2370 | * If we do, we can potentially be spinning for commands that | |
2371 | * already triggered a CQE (eg in error). | |
2372 | */ | |
5ed7a37d | 2373 | if (test_bit(0, &ctx->check_cq_overflow)) |
f39c8a5b PB |
2374 | __io_cqring_overflow_flush(ctx, false); |
2375 | if (io_cqring_events(ctx)) | |
2376 | goto out; | |
def596e9 | 2377 | do { |
500f9fba JA |
2378 | /* |
2379 | * If a submit got punted to a workqueue, we can have the | |
2380 | * application entering polling for a command before it gets | |
2381 | * issued. That app will hold the uring_lock for the duration | |
2382 | * of the poll right here, so we need to take a breather every | |
2383 | * now and then to ensure that the issue has a chance to add | |
2384 | * the poll to the issued list. Otherwise we can spin here | |
2385 | * forever, while the workqueue is stuck trying to acquire the | |
2386 | * very same mutex. | |
2387 | */ | |
e9979b36 | 2388 | if (list_empty(&ctx->iopoll_list)) { |
8f487ef2 PB |
2389 | u32 tail = ctx->cached_cq_tail; |
2390 | ||
500f9fba | 2391 | mutex_unlock(&ctx->uring_lock); |
4c6e277c | 2392 | io_run_task_work(); |
500f9fba | 2393 | mutex_lock(&ctx->uring_lock); |
def596e9 | 2394 | |
8f487ef2 PB |
2395 | /* some requests don't go through iopoll_list */ |
2396 | if (tail != ctx->cached_cq_tail || | |
2397 | list_empty(&ctx->iopoll_list)) | |
e9979b36 | 2398 | break; |
500f9fba | 2399 | } |
3c30ef0f | 2400 | ret = io_do_iopoll(ctx, &nr_events, min, true); |
f39c8a5b PB |
2401 | } while (!ret && nr_events < min && !need_resched()); |
2402 | out: | |
500f9fba | 2403 | mutex_unlock(&ctx->uring_lock); |
def596e9 JA |
2404 | return ret; |
2405 | } | |
2406 | ||
491381ce | 2407 | static void kiocb_end_write(struct io_kiocb *req) |
2b188cc1 | 2408 | { |
491381ce JA |
2409 | /* |
2410 | * Tell lockdep we inherited freeze protection from submission | |
2411 | * thread. | |
2412 | */ | |
2413 | if (req->flags & REQ_F_ISREG) { | |
1c98679d | 2414 | struct super_block *sb = file_inode(req->file)->i_sb; |
2b188cc1 | 2415 | |
1c98679d PB |
2416 | __sb_writers_acquired(sb, SB_FREEZE_WRITE); |
2417 | sb_end_write(sb); | |
2b188cc1 JA |
2418 | } |
2419 | } | |
2420 | ||
b63534c4 | 2421 | #ifdef CONFIG_BLOCK |
dc2a6e9a | 2422 | static bool io_resubmit_prep(struct io_kiocb *req) |
b63534c4 | 2423 | { |
ab454438 | 2424 | struct io_async_rw *rw = req->async_data; |
b63534c4 | 2425 | |
ab454438 PB |
2426 | if (!rw) |
2427 | return !io_req_prep_async(req); | |
2428 | /* may have left rw->iter inconsistent on -EIOCBQUEUED */ | |
2429 | iov_iter_revert(&rw->iter, req->result - iov_iter_count(&rw->iter)); | |
2430 | return true; | |
b63534c4 | 2431 | } |
b63534c4 | 2432 | |
3e6a0d3c | 2433 | static bool io_rw_should_reissue(struct io_kiocb *req) |
b63534c4 | 2434 | { |
355afaeb | 2435 | umode_t mode = file_inode(req->file)->i_mode; |
3e6a0d3c | 2436 | struct io_ring_ctx *ctx = req->ctx; |
b63534c4 | 2437 | |
355afaeb JA |
2438 | if (!S_ISBLK(mode) && !S_ISREG(mode)) |
2439 | return false; | |
3e6a0d3c JA |
2440 | if ((req->flags & REQ_F_NOWAIT) || (io_wq_current_is_worker() && |
2441 | !(ctx->flags & IORING_SETUP_IOPOLL))) | |
b63534c4 | 2442 | return false; |
7c977a58 JA |
2443 | /* |
2444 | * If ref is dying, we might be running poll reap from the exit work. | |
2445 | * Don't attempt to reissue from that path, just let it fail with | |
2446 | * -EAGAIN. | |
2447 | */ | |
3e6a0d3c JA |
2448 | if (percpu_ref_is_dying(&ctx->refs)) |
2449 | return false; | |
ef046888 JA |
2450 | /* |
2451 | * Play it safe and assume not safe to re-import and reissue if we're | |
2452 | * not in the original thread group (or in task context). | |
2453 | */ | |
2454 | if (!same_thread_group(req->task, current) || !in_task()) | |
2455 | return false; | |
3e6a0d3c JA |
2456 | return true; |
2457 | } | |
e82ad485 | 2458 | #else |
a1ff1e3f | 2459 | static bool io_resubmit_prep(struct io_kiocb *req) |
e82ad485 JA |
2460 | { |
2461 | return false; | |
2462 | } | |
e82ad485 | 2463 | static bool io_rw_should_reissue(struct io_kiocb *req) |
3e6a0d3c | 2464 | { |
b63534c4 JA |
2465 | return false; |
2466 | } | |
3e6a0d3c | 2467 | #endif |
b63534c4 | 2468 | |
9011bf9a PB |
2469 | static void io_fallback_req_func(struct work_struct *work) |
2470 | { | |
2471 | struct io_ring_ctx *ctx = container_of(work, struct io_ring_ctx, | |
2472 | fallback_work.work); | |
2473 | struct llist_node *node = llist_del_all(&ctx->fallback_llist); | |
2474 | struct io_kiocb *req, *tmp; | |
2475 | ||
9cb0073b | 2476 | percpu_ref_get(&ctx->refs); |
5b0a6acc PB |
2477 | llist_for_each_entry_safe(req, tmp, node, io_task_work.fallback_node) |
2478 | req->io_task_work.func(req); | |
9cb0073b | 2479 | percpu_ref_put(&ctx->refs); |
9011bf9a PB |
2480 | } |
2481 | ||
a1d7c393 | 2482 | static void __io_complete_rw(struct io_kiocb *req, long res, long res2, |
889fca73 | 2483 | unsigned int issue_flags) |
a1d7c393 | 2484 | { |
2f8e45f1 PB |
2485 | int cflags = 0; |
2486 | ||
b65c128f PB |
2487 | if (req->rw.kiocb.ki_flags & IOCB_WRITE) |
2488 | kiocb_end_write(req); | |
9532b99b PB |
2489 | if (res != req->result) { |
2490 | if ((res == -EAGAIN || res == -EOPNOTSUPP) && | |
2491 | io_rw_should_reissue(req)) { | |
2492 | req->flags |= REQ_F_REISSUE; | |
2493 | return; | |
2494 | } | |
93d2bcd2 | 2495 | req_set_fail(req); |
9532b99b | 2496 | } |
2f8e45f1 PB |
2497 | if (req->flags & REQ_F_BUFFER_SELECTED) |
2498 | cflags = io_put_rw_kbuf(req); | |
2499 | __io_req_complete(req, issue_flags, res, cflags); | |
ba816ad6 JA |
2500 | } |
2501 | ||
2502 | static void io_complete_rw(struct kiocb *kiocb, long res, long res2) | |
2503 | { | |
9adbd45d | 2504 | struct io_kiocb *req = container_of(kiocb, struct io_kiocb, rw.kiocb); |
ba816ad6 | 2505 | |
889fca73 | 2506 | __io_complete_rw(req, res, res2, 0); |
2b188cc1 JA |
2507 | } |
2508 | ||
def596e9 JA |
2509 | static void io_complete_rw_iopoll(struct kiocb *kiocb, long res, long res2) |
2510 | { | |
9adbd45d | 2511 | struct io_kiocb *req = container_of(kiocb, struct io_kiocb, rw.kiocb); |
def596e9 | 2512 | |
491381ce JA |
2513 | if (kiocb->ki_flags & IOCB_WRITE) |
2514 | kiocb_end_write(req); | |
9532b99b | 2515 | if (unlikely(res != req->result)) { |
a1ff1e3f JA |
2516 | if (!(res == -EAGAIN && io_rw_should_reissue(req) && |
2517 | io_resubmit_prep(req))) { | |
93d2bcd2 | 2518 | req_set_fail(req); |
9532b99b PB |
2519 | req->flags |= REQ_F_DONT_REISSUE; |
2520 | } | |
8c130827 | 2521 | } |
bbde017a XW |
2522 | |
2523 | WRITE_ONCE(req->result, res); | |
b9b0e0d3 | 2524 | /* order with io_iopoll_complete() checking ->result */ |
cd664b0e PB |
2525 | smp_wmb(); |
2526 | WRITE_ONCE(req->iopoll_completed, 1); | |
def596e9 JA |
2527 | } |
2528 | ||
2529 | /* | |
2530 | * After the iocb has been issued, it's safe to be found on the poll list. | |
2531 | * Adding the kiocb to the list AFTER submission ensures that we don't | |
f39c8a5b | 2532 | * find it from a io_do_iopoll() thread before the issuer is done |
def596e9 JA |
2533 | * accessing the kiocb cookie. |
2534 | */ | |
cb3d8972 | 2535 | static void io_iopoll_req_issued(struct io_kiocb *req) |
def596e9 JA |
2536 | { |
2537 | struct io_ring_ctx *ctx = req->ctx; | |
cb3d8972 PB |
2538 | const bool in_async = io_wq_current_is_worker(); |
2539 | ||
2540 | /* workqueue context doesn't hold uring_lock, grab it now */ | |
2541 | if (unlikely(in_async)) | |
2542 | mutex_lock(&ctx->uring_lock); | |
def596e9 JA |
2543 | |
2544 | /* | |
2545 | * Track whether we have multiple files in our lists. This will impact | |
2546 | * how we do polling eventually, not spinning if we're on potentially | |
2547 | * different devices. | |
2548 | */ | |
540e32a0 | 2549 | if (list_empty(&ctx->iopoll_list)) { |
915b3dde HX |
2550 | ctx->poll_multi_queue = false; |
2551 | } else if (!ctx->poll_multi_queue) { | |
def596e9 | 2552 | struct io_kiocb *list_req; |
915b3dde | 2553 | unsigned int queue_num0, queue_num1; |
def596e9 | 2554 | |
540e32a0 | 2555 | list_req = list_first_entry(&ctx->iopoll_list, struct io_kiocb, |
d21ffe7e | 2556 | inflight_entry); |
915b3dde HX |
2557 | |
2558 | if (list_req->file != req->file) { | |
2559 | ctx->poll_multi_queue = true; | |
2560 | } else { | |
2561 | queue_num0 = blk_qc_t_to_queue_num(list_req->rw.kiocb.ki_cookie); | |
2562 | queue_num1 = blk_qc_t_to_queue_num(req->rw.kiocb.ki_cookie); | |
2563 | if (queue_num0 != queue_num1) | |
2564 | ctx->poll_multi_queue = true; | |
2565 | } | |
def596e9 JA |
2566 | } |
2567 | ||
2568 | /* | |
2569 | * For fast devices, IO may have already completed. If it has, add | |
2570 | * it to the front so we find it first. | |
2571 | */ | |
65a6543d | 2572 | if (READ_ONCE(req->iopoll_completed)) |
d21ffe7e | 2573 | list_add(&req->inflight_entry, &ctx->iopoll_list); |
def596e9 | 2574 | else |
d21ffe7e | 2575 | list_add_tail(&req->inflight_entry, &ctx->iopoll_list); |
bdcd3eab | 2576 | |
cb3d8972 PB |
2577 | if (unlikely(in_async)) { |
2578 | /* | |
2579 | * If IORING_SETUP_SQPOLL is enabled, sqes are either handle | |
2580 | * in sq thread task context or in io worker task context. If | |
2581 | * current task context is sq thread, we don't need to check | |
2582 | * whether should wake up sq thread. | |
2583 | */ | |
2584 | if ((ctx->flags & IORING_SETUP_SQPOLL) && | |
2585 | wq_has_sleeper(&ctx->sq_data->wait)) | |
2586 | wake_up(&ctx->sq_data->wait); | |
2587 | ||
2588 | mutex_unlock(&ctx->uring_lock); | |
2589 | } | |
def596e9 JA |
2590 | } |
2591 | ||
9f13c35b PB |
2592 | static inline void io_state_file_put(struct io_submit_state *state) |
2593 | { | |
02b23a9a PB |
2594 | if (state->file_refs) { |
2595 | fput_many(state->file, state->file_refs); | |
2596 | state->file_refs = 0; | |
2597 | } | |
9a56a232 JA |
2598 | } |
2599 | ||
2600 | /* | |
2601 | * Get as many references to a file as we have IOs left in this submission, | |
2602 | * assuming most submissions are for one file, or at least that each file | |
2603 | * has more than one submission. | |
2604 | */ | |
8da11c19 | 2605 | static struct file *__io_file_get(struct io_submit_state *state, int fd) |
9a56a232 JA |
2606 | { |
2607 | if (!state) | |
2608 | return fget(fd); | |
2609 | ||
6e1271e6 | 2610 | if (state->file_refs) { |
9a56a232 | 2611 | if (state->fd == fd) { |
6e1271e6 | 2612 | state->file_refs--; |
9a56a232 JA |
2613 | return state->file; |
2614 | } | |
02b23a9a | 2615 | io_state_file_put(state); |
9a56a232 JA |
2616 | } |
2617 | state->file = fget_many(fd, state->ios_left); | |
6e1271e6 | 2618 | if (unlikely(!state->file)) |
9a56a232 JA |
2619 | return NULL; |
2620 | ||
2621 | state->fd = fd; | |
6e1271e6 | 2622 | state->file_refs = state->ios_left - 1; |
9a56a232 JA |
2623 | return state->file; |
2624 | } | |
2625 | ||
4503b767 JA |
2626 | static bool io_bdev_nowait(struct block_device *bdev) |
2627 | { | |
9ba0d0c8 | 2628 | return !bdev || blk_queue_nowait(bdev_get_queue(bdev)); |
4503b767 JA |
2629 | } |
2630 | ||
2b188cc1 JA |
2631 | /* |
2632 | * If we tracked the file through the SCM inflight mechanism, we could support | |
2633 | * any file. For now, just ensure that anything potentially problematic is done | |
2634 | * inline. | |
2635 | */ | |
b191e2df | 2636 | static bool __io_file_supports_nowait(struct file *file, int rw) |
2b188cc1 JA |
2637 | { |
2638 | umode_t mode = file_inode(file)->i_mode; | |
2639 | ||
4503b767 | 2640 | if (S_ISBLK(mode)) { |
4e7b5671 CH |
2641 | if (IS_ENABLED(CONFIG_BLOCK) && |
2642 | io_bdev_nowait(I_BDEV(file->f_mapping->host))) | |
4503b767 JA |
2643 | return true; |
2644 | return false; | |
2645 | } | |
976517f1 | 2646 | if (S_ISSOCK(mode)) |
2b188cc1 | 2647 | return true; |
4503b767 | 2648 | if (S_ISREG(mode)) { |
4e7b5671 CH |
2649 | if (IS_ENABLED(CONFIG_BLOCK) && |
2650 | io_bdev_nowait(file->f_inode->i_sb->s_bdev) && | |
4503b767 JA |
2651 | file->f_op != &io_uring_fops) |
2652 | return true; | |
2653 | return false; | |
2654 | } | |
2b188cc1 | 2655 | |
c5b85625 JA |
2656 | /* any ->read/write should understand O_NONBLOCK */ |
2657 | if (file->f_flags & O_NONBLOCK) | |
2658 | return true; | |
2659 | ||
af197f50 JA |
2660 | if (!(file->f_mode & FMODE_NOWAIT)) |
2661 | return false; | |
2662 | ||
2663 | if (rw == READ) | |
2664 | return file->f_op->read_iter != NULL; | |
2665 | ||
2666 | return file->f_op->write_iter != NULL; | |
2b188cc1 JA |
2667 | } |
2668 | ||
b191e2df | 2669 | static bool io_file_supports_nowait(struct io_kiocb *req, int rw) |
7b29f92d | 2670 | { |
b191e2df | 2671 | if (rw == READ && (req->flags & REQ_F_NOWAIT_READ)) |
7b29f92d | 2672 | return true; |
b191e2df | 2673 | else if (rw == WRITE && (req->flags & REQ_F_NOWAIT_WRITE)) |
7b29f92d JA |
2674 | return true; |
2675 | ||
b191e2df | 2676 | return __io_file_supports_nowait(req->file, rw); |
7b29f92d JA |
2677 | } |
2678 | ||
a88fc400 | 2679 | static int io_prep_rw(struct io_kiocb *req, const struct io_uring_sqe *sqe) |
2b188cc1 | 2680 | { |
def596e9 | 2681 | struct io_ring_ctx *ctx = req->ctx; |
9adbd45d | 2682 | struct kiocb *kiocb = &req->rw.kiocb; |
75c668cd | 2683 | struct file *file = req->file; |
09bb8394 JA |
2684 | unsigned ioprio; |
2685 | int ret; | |
2b188cc1 | 2686 | |
c97d8a0f | 2687 | if (!io_req_ffs_set(req) && S_ISREG(file_inode(file)->i_mode)) |
491381ce JA |
2688 | req->flags |= REQ_F_ISREG; |
2689 | ||
2b188cc1 | 2690 | kiocb->ki_pos = READ_ONCE(sqe->off); |
75c668cd | 2691 | if (kiocb->ki_pos == -1 && !(file->f_mode & FMODE_STREAM)) { |
ba04291e | 2692 | req->flags |= REQ_F_CUR_POS; |
75c668cd | 2693 | kiocb->ki_pos = file->f_pos; |
ba04291e | 2694 | } |
2b188cc1 | 2695 | kiocb->ki_hint = ki_hint_validate(file_write_hint(kiocb->ki_filp)); |
3e577dcd PB |
2696 | kiocb->ki_flags = iocb_flags(kiocb->ki_filp); |
2697 | ret = kiocb_set_rw_flags(kiocb, READ_ONCE(sqe->rw_flags)); | |
2698 | if (unlikely(ret)) | |
2699 | return ret; | |
2b188cc1 | 2700 | |
75c668cd PB |
2701 | /* don't allow async punt for O_NONBLOCK or RWF_NOWAIT */ |
2702 | if ((kiocb->ki_flags & IOCB_NOWAIT) || (file->f_flags & O_NONBLOCK)) | |
2703 | req->flags |= REQ_F_NOWAIT; | |
2704 | ||
2b188cc1 JA |
2705 | ioprio = READ_ONCE(sqe->ioprio); |
2706 | if (ioprio) { | |
2707 | ret = ioprio_check_cap(ioprio); | |
2708 | if (ret) | |
09bb8394 | 2709 | return ret; |
2b188cc1 JA |
2710 | |
2711 | kiocb->ki_ioprio = ioprio; | |
2712 | } else | |
2713 | kiocb->ki_ioprio = get_current_ioprio(); | |
2714 | ||
def596e9 | 2715 | if (ctx->flags & IORING_SETUP_IOPOLL) { |
def596e9 JA |
2716 | if (!(kiocb->ki_flags & IOCB_DIRECT) || |
2717 | !kiocb->ki_filp->f_op->iopoll) | |
09bb8394 | 2718 | return -EOPNOTSUPP; |
2b188cc1 | 2719 | |
def596e9 JA |
2720 | kiocb->ki_flags |= IOCB_HIPRI; |
2721 | kiocb->ki_complete = io_complete_rw_iopoll; | |
65a6543d | 2722 | req->iopoll_completed = 0; |
def596e9 | 2723 | } else { |
09bb8394 JA |
2724 | if (kiocb->ki_flags & IOCB_HIPRI) |
2725 | return -EINVAL; | |
def596e9 JA |
2726 | kiocb->ki_complete = io_complete_rw; |
2727 | } | |
9adbd45d | 2728 | |
eae071c9 PB |
2729 | if (req->opcode == IORING_OP_READ_FIXED || |
2730 | req->opcode == IORING_OP_WRITE_FIXED) { | |
2731 | req->imu = NULL; | |
2732 | io_req_set_rsrc_node(req); | |
2733 | } | |
2734 | ||
3529d8c2 JA |
2735 | req->rw.addr = READ_ONCE(sqe->addr); |
2736 | req->rw.len = READ_ONCE(sqe->len); | |
4f4eeba8 | 2737 | req->buf_index = READ_ONCE(sqe->buf_index); |
2b188cc1 | 2738 | return 0; |
2b188cc1 JA |
2739 | } |
2740 | ||
2741 | static inline void io_rw_done(struct kiocb *kiocb, ssize_t ret) | |
2742 | { | |
2743 | switch (ret) { | |
2744 | case -EIOCBQUEUED: | |
2745 | break; | |
2746 | case -ERESTARTSYS: | |
2747 | case -ERESTARTNOINTR: | |
2748 | case -ERESTARTNOHAND: | |
2749 | case -ERESTART_RESTARTBLOCK: | |
2750 | /* | |
2751 | * We can't just restart the syscall, since previously | |
2752 | * submitted sqes may already be in progress. Just fail this | |
2753 | * IO with EINTR. | |
2754 | */ | |
2755 | ret = -EINTR; | |
df561f66 | 2756 | fallthrough; |
2b188cc1 JA |
2757 | default: |
2758 | kiocb->ki_complete(kiocb, ret, 0); | |
2759 | } | |
2760 | } | |
2761 | ||
a1d7c393 | 2762 | static void kiocb_done(struct kiocb *kiocb, ssize_t ret, |
889fca73 | 2763 | unsigned int issue_flags) |
ba816ad6 | 2764 | { |
ba04291e | 2765 | struct io_kiocb *req = container_of(kiocb, struct io_kiocb, rw.kiocb); |
e8c2bc1f | 2766 | struct io_async_rw *io = req->async_data; |
97284637 | 2767 | bool check_reissue = kiocb->ki_complete == io_complete_rw; |
ba04291e | 2768 | |
227c0c96 | 2769 | /* add previously done IO, if any */ |
e8c2bc1f | 2770 | if (io && io->bytes_done > 0) { |
227c0c96 | 2771 | if (ret < 0) |
e8c2bc1f | 2772 | ret = io->bytes_done; |
227c0c96 | 2773 | else |
e8c2bc1f | 2774 | ret += io->bytes_done; |
227c0c96 JA |
2775 | } |
2776 | ||
ba04291e JA |
2777 | if (req->flags & REQ_F_CUR_POS) |
2778 | req->file->f_pos = kiocb->ki_pos; | |
e149bd74 | 2779 | if (ret >= 0 && check_reissue) |
889fca73 | 2780 | __io_complete_rw(req, ret, 0, issue_flags); |
ba816ad6 JA |
2781 | else |
2782 | io_rw_done(kiocb, ret); | |
97284637 | 2783 | |
fe7e3257 | 2784 | if (check_reissue && (req->flags & REQ_F_REISSUE)) { |
97284637 | 2785 | req->flags &= ~REQ_F_REISSUE; |
a7be7c23 | 2786 | if (io_resubmit_prep(req)) { |
8c130827 | 2787 | req_ref_get(req); |
773af691 | 2788 | io_req_task_queue_reissue(req); |
8c130827 | 2789 | } else { |
97284637 PB |
2790 | int cflags = 0; |
2791 | ||
93d2bcd2 | 2792 | req_set_fail(req); |
97284637 PB |
2793 | if (req->flags & REQ_F_BUFFER_SELECTED) |
2794 | cflags = io_put_rw_kbuf(req); | |
2795 | __io_req_complete(req, issue_flags, ret, cflags); | |
2796 | } | |
2797 | } | |
ba816ad6 JA |
2798 | } |
2799 | ||
eae071c9 PB |
2800 | static int __io_import_fixed(struct io_kiocb *req, int rw, struct iov_iter *iter, |
2801 | struct io_mapped_ubuf *imu) | |
edafccee | 2802 | { |
9adbd45d | 2803 | size_t len = req->rw.len; |
75769e3f | 2804 | u64 buf_end, buf_addr = req->rw.addr; |
edafccee | 2805 | size_t offset; |
edafccee | 2806 | |
75769e3f | 2807 | if (unlikely(check_add_overflow(buf_addr, (u64)len, &buf_end))) |
edafccee JA |
2808 | return -EFAULT; |
2809 | /* not inside the mapped region */ | |
4751f53d | 2810 | if (unlikely(buf_addr < imu->ubuf || buf_end > imu->ubuf_end)) |
edafccee JA |
2811 | return -EFAULT; |
2812 | ||
2813 | /* | |
2814 | * May not be a start of buffer, set size appropriately | |
2815 | * and advance us to the beginning. | |
2816 | */ | |
2817 | offset = buf_addr - imu->ubuf; | |
2818 | iov_iter_bvec(iter, rw, imu->bvec, imu->nr_bvecs, offset + len); | |
bd11b3a3 JA |
2819 | |
2820 | if (offset) { | |
2821 | /* | |
2822 | * Don't use iov_iter_advance() here, as it's really slow for | |
2823 | * using the latter parts of a big fixed buffer - it iterates | |
2824 | * over each segment manually. We can cheat a bit here, because | |
2825 | * we know that: | |
2826 | * | |
2827 | * 1) it's a BVEC iter, we set it up | |
2828 | * 2) all bvecs are PAGE_SIZE in size, except potentially the | |
2829 | * first and last bvec | |
2830 | * | |
2831 | * So just find our index, and adjust the iterator afterwards. | |
2832 | * If the offset is within the first bvec (or the whole first | |
2833 | * bvec, just use iov_iter_advance(). This makes it easier | |
2834 | * since we can just skip the first segment, which may not | |
2835 | * be PAGE_SIZE aligned. | |
2836 | */ | |
2837 | const struct bio_vec *bvec = imu->bvec; | |
2838 | ||
2839 | if (offset <= bvec->bv_len) { | |
2840 | iov_iter_advance(iter, offset); | |
2841 | } else { | |
2842 | unsigned long seg_skip; | |
2843 | ||
2844 | /* skip first vec */ | |
2845 | offset -= bvec->bv_len; | |
2846 | seg_skip = 1 + (offset >> PAGE_SHIFT); | |
2847 | ||
2848 | iter->bvec = bvec + seg_skip; | |
2849 | iter->nr_segs -= seg_skip; | |
99c79f66 | 2850 | iter->count -= bvec->bv_len + offset; |
bd11b3a3 | 2851 | iter->iov_offset = offset & ~PAGE_MASK; |
bd11b3a3 JA |
2852 | } |
2853 | } | |
2854 | ||
847595de | 2855 | return 0; |
edafccee JA |
2856 | } |
2857 | ||
eae071c9 PB |
2858 | static int io_import_fixed(struct io_kiocb *req, int rw, struct iov_iter *iter) |
2859 | { | |
2860 | struct io_ring_ctx *ctx = req->ctx; | |
2861 | struct io_mapped_ubuf *imu = req->imu; | |
2862 | u16 index, buf_index = req->buf_index; | |
2863 | ||
2864 | if (likely(!imu)) { | |
2865 | if (unlikely(buf_index >= ctx->nr_user_bufs)) | |
2866 | return -EFAULT; | |
2867 | index = array_index_nospec(buf_index, ctx->nr_user_bufs); | |
2868 | imu = READ_ONCE(ctx->user_bufs[index]); | |
2869 | req->imu = imu; | |
2870 | } | |
2871 | return __io_import_fixed(req, rw, iter, imu); | |
2872 | } | |
2873 | ||
bcda7baa JA |
2874 | static void io_ring_submit_unlock(struct io_ring_ctx *ctx, bool needs_lock) |
2875 | { | |
2876 | if (needs_lock) | |
2877 | mutex_unlock(&ctx->uring_lock); | |
2878 | } | |
2879 | ||
2880 | static void io_ring_submit_lock(struct io_ring_ctx *ctx, bool needs_lock) | |
2881 | { | |
2882 | /* | |
2883 | * "Normal" inline submissions always hold the uring_lock, since we | |
2884 | * grab it from the system call. Same is true for the SQPOLL offload. | |
2885 | * The only exception is when we've detached the request and issue it | |
2886 | * from an async worker thread, grab the lock for that case. | |
2887 | */ | |
2888 | if (needs_lock) | |
2889 | mutex_lock(&ctx->uring_lock); | |
2890 | } | |
2891 | ||
2892 | static struct io_buffer *io_buffer_select(struct io_kiocb *req, size_t *len, | |
2893 | int bgid, struct io_buffer *kbuf, | |
2894 | bool needs_lock) | |
2895 | { | |
2896 | struct io_buffer *head; | |
2897 | ||
2898 | if (req->flags & REQ_F_BUFFER_SELECTED) | |
2899 | return kbuf; | |
2900 | ||
2901 | io_ring_submit_lock(req->ctx, needs_lock); | |
2902 | ||
2903 | lockdep_assert_held(&req->ctx->uring_lock); | |
2904 | ||
9e15c3a0 | 2905 | head = xa_load(&req->ctx->io_buffers, bgid); |
bcda7baa JA |
2906 | if (head) { |
2907 | if (!list_empty(&head->list)) { | |
2908 | kbuf = list_last_entry(&head->list, struct io_buffer, | |
2909 | list); | |
2910 | list_del(&kbuf->list); | |
2911 | } else { | |
2912 | kbuf = head; | |
9e15c3a0 | 2913 | xa_erase(&req->ctx->io_buffers, bgid); |
bcda7baa JA |
2914 | } |
2915 | if (*len > kbuf->len) | |
2916 | *len = kbuf->len; | |
2917 | } else { | |
2918 | kbuf = ERR_PTR(-ENOBUFS); | |
2919 | } | |
2920 | ||
2921 | io_ring_submit_unlock(req->ctx, needs_lock); | |
2922 | ||
2923 | return kbuf; | |
2924 | } | |
2925 | ||
4d954c25 JA |
2926 | static void __user *io_rw_buffer_select(struct io_kiocb *req, size_t *len, |
2927 | bool needs_lock) | |
2928 | { | |
2929 | struct io_buffer *kbuf; | |
4f4eeba8 | 2930 | u16 bgid; |
4d954c25 JA |
2931 | |
2932 | kbuf = (struct io_buffer *) (unsigned long) req->rw.addr; | |
4f4eeba8 | 2933 | bgid = req->buf_index; |
4d954c25 JA |
2934 | kbuf = io_buffer_select(req, len, bgid, kbuf, needs_lock); |
2935 | if (IS_ERR(kbuf)) | |
2936 | return kbuf; | |
2937 | req->rw.addr = (u64) (unsigned long) kbuf; | |
2938 | req->flags |= REQ_F_BUFFER_SELECTED; | |
2939 | return u64_to_user_ptr(kbuf->addr); | |
2940 | } | |
2941 | ||
2942 | #ifdef CONFIG_COMPAT | |
2943 | static ssize_t io_compat_import(struct io_kiocb *req, struct iovec *iov, | |
2944 | bool needs_lock) | |
2945 | { | |
2946 | struct compat_iovec __user *uiov; | |
2947 | compat_ssize_t clen; | |
2948 | void __user *buf; | |
2949 | ssize_t len; | |
2950 | ||
2951 | uiov = u64_to_user_ptr(req->rw.addr); | |
2952 | if (!access_ok(uiov, sizeof(*uiov))) | |
2953 | return -EFAULT; | |
2954 | if (__get_user(clen, &uiov->iov_len)) | |
2955 | return -EFAULT; | |
2956 | if (clen < 0) | |
2957 | return -EINVAL; | |
2958 | ||
2959 | len = clen; | |
2960 | buf = io_rw_buffer_select(req, &len, needs_lock); | |
2961 | if (IS_ERR(buf)) | |
2962 | return PTR_ERR(buf); | |
2963 | iov[0].iov_base = buf; | |
2964 | iov[0].iov_len = (compat_size_t) len; | |
2965 | return 0; | |
2966 | } | |
2967 | #endif | |
2968 | ||
2969 | static ssize_t __io_iov_buffer_select(struct io_kiocb *req, struct iovec *iov, | |
2970 | bool needs_lock) | |
2971 | { | |
2972 | struct iovec __user *uiov = u64_to_user_ptr(req->rw.addr); | |
2973 | void __user *buf; | |
2974 | ssize_t len; | |
2975 | ||
2976 | if (copy_from_user(iov, uiov, sizeof(*uiov))) | |
2977 | return -EFAULT; | |
2978 | ||
2979 | len = iov[0].iov_len; | |
2980 | if (len < 0) | |
2981 | return -EINVAL; | |
2982 | buf = io_rw_buffer_select(req, &len, needs_lock); | |
2983 | if (IS_ERR(buf)) | |
2984 | return PTR_ERR(buf); | |
2985 | iov[0].iov_base = buf; | |
2986 | iov[0].iov_len = len; | |
2987 | return 0; | |
2988 | } | |
2989 | ||
2990 | static ssize_t io_iov_buffer_select(struct io_kiocb *req, struct iovec *iov, | |
2991 | bool needs_lock) | |
2992 | { | |
dddb3e26 JA |
2993 | if (req->flags & REQ_F_BUFFER_SELECTED) { |
2994 | struct io_buffer *kbuf; | |
2995 | ||
2996 | kbuf = (struct io_buffer *) (unsigned long) req->rw.addr; | |
2997 | iov[0].iov_base = u64_to_user_ptr(kbuf->addr); | |
2998 | iov[0].iov_len = kbuf->len; | |
4d954c25 | 2999 | return 0; |
dddb3e26 | 3000 | } |
dd201662 | 3001 | if (req->rw.len != 1) |
4d954c25 JA |
3002 | return -EINVAL; |
3003 | ||
3004 | #ifdef CONFIG_COMPAT | |
3005 | if (req->ctx->compat) | |
3006 | return io_compat_import(req, iov, needs_lock); | |
3007 | #endif | |
3008 | ||
3009 | return __io_iov_buffer_select(req, iov, needs_lock); | |
3010 | } | |
3011 | ||
847595de PB |
3012 | static int io_import_iovec(int rw, struct io_kiocb *req, struct iovec **iovec, |
3013 | struct iov_iter *iter, bool needs_lock) | |
2b188cc1 | 3014 | { |
9adbd45d JA |
3015 | void __user *buf = u64_to_user_ptr(req->rw.addr); |
3016 | size_t sqe_len = req->rw.len; | |
847595de | 3017 | u8 opcode = req->opcode; |
4d954c25 | 3018 | ssize_t ret; |
edafccee | 3019 | |
7d009165 | 3020 | if (opcode == IORING_OP_READ_FIXED || opcode == IORING_OP_WRITE_FIXED) { |
edafccee | 3021 | *iovec = NULL; |
9adbd45d | 3022 | return io_import_fixed(req, rw, iter); |
edafccee | 3023 | } |
2b188cc1 | 3024 | |
bcda7baa | 3025 | /* buffer index only valid with fixed read/write, or buffer select */ |
4f4eeba8 | 3026 | if (req->buf_index && !(req->flags & REQ_F_BUFFER_SELECT)) |
9adbd45d JA |
3027 | return -EINVAL; |
3028 | ||
3a6820f2 | 3029 | if (opcode == IORING_OP_READ || opcode == IORING_OP_WRITE) { |
bcda7baa | 3030 | if (req->flags & REQ_F_BUFFER_SELECT) { |
4d954c25 | 3031 | buf = io_rw_buffer_select(req, &sqe_len, needs_lock); |
867a23ea | 3032 | if (IS_ERR(buf)) |
4d954c25 | 3033 | return PTR_ERR(buf); |
3f9d6441 | 3034 | req->rw.len = sqe_len; |
bcda7baa JA |
3035 | } |
3036 | ||
3a6820f2 JA |
3037 | ret = import_single_range(rw, buf, sqe_len, *iovec, iter); |
3038 | *iovec = NULL; | |
10fc72e4 | 3039 | return ret; |
3a6820f2 JA |
3040 | } |
3041 | ||
4d954c25 JA |
3042 | if (req->flags & REQ_F_BUFFER_SELECT) { |
3043 | ret = io_iov_buffer_select(req, *iovec, needs_lock); | |
847595de PB |
3044 | if (!ret) |
3045 | iov_iter_init(iter, rw, *iovec, 1, (*iovec)->iov_len); | |
4d954c25 JA |
3046 | *iovec = NULL; |
3047 | return ret; | |
3048 | } | |
3049 | ||
89cd35c5 CH |
3050 | return __import_iovec(rw, buf, sqe_len, UIO_FASTIOV, iovec, iter, |
3051 | req->ctx->compat); | |
2b188cc1 JA |
3052 | } |
3053 | ||
0fef9483 JA |
3054 | static inline loff_t *io_kiocb_ppos(struct kiocb *kiocb) |
3055 | { | |
5b09e37e | 3056 | return (kiocb->ki_filp->f_mode & FMODE_STREAM) ? NULL : &kiocb->ki_pos; |
0fef9483 JA |
3057 | } |
3058 | ||
31b51510 | 3059 | /* |
32960613 JA |
3060 | * For files that don't have ->read_iter() and ->write_iter(), handle them |
3061 | * by looping over ->read() or ->write() manually. | |
31b51510 | 3062 | */ |
4017eb91 | 3063 | static ssize_t loop_rw_iter(int rw, struct io_kiocb *req, struct iov_iter *iter) |
32960613 | 3064 | { |
4017eb91 JA |
3065 | struct kiocb *kiocb = &req->rw.kiocb; |
3066 | struct file *file = req->file; | |
32960613 JA |
3067 | ssize_t ret = 0; |
3068 | ||
3069 | /* | |
3070 | * Don't support polled IO through this interface, and we can't | |
3071 | * support non-blocking either. For the latter, this just causes | |
3072 | * the kiocb to be handled from an async context. | |
3073 | */ | |
3074 | if (kiocb->ki_flags & IOCB_HIPRI) | |
3075 | return -EOPNOTSUPP; | |
3076 | if (kiocb->ki_flags & IOCB_NOWAIT) | |
3077 | return -EAGAIN; | |
3078 | ||
3079 | while (iov_iter_count(iter)) { | |
311ae9e1 | 3080 | struct iovec iovec; |
32960613 JA |
3081 | ssize_t nr; |
3082 | ||
311ae9e1 PB |
3083 | if (!iov_iter_is_bvec(iter)) { |
3084 | iovec = iov_iter_iovec(iter); | |
3085 | } else { | |
4017eb91 JA |
3086 | iovec.iov_base = u64_to_user_ptr(req->rw.addr); |
3087 | iovec.iov_len = req->rw.len; | |
311ae9e1 PB |
3088 | } |
3089 | ||
32960613 JA |
3090 | if (rw == READ) { |
3091 | nr = file->f_op->read(file, iovec.iov_base, | |
0fef9483 | 3092 | iovec.iov_len, io_kiocb_ppos(kiocb)); |
32960613 JA |
3093 | } else { |
3094 | nr = file->f_op->write(file, iovec.iov_base, | |
0fef9483 | 3095 | iovec.iov_len, io_kiocb_ppos(kiocb)); |
32960613 JA |
3096 | } |
3097 | ||
3098 | if (nr < 0) { | |
3099 | if (!ret) | |
3100 | ret = nr; | |
3101 | break; | |
3102 | } | |
3103 | ret += nr; | |
3104 | if (nr != iovec.iov_len) | |
3105 | break; | |
4017eb91 JA |
3106 | req->rw.len -= nr; |
3107 | req->rw.addr += nr; | |
32960613 JA |
3108 | iov_iter_advance(iter, nr); |
3109 | } | |
3110 | ||
3111 | return ret; | |
3112 | } | |
3113 | ||
ff6165b2 JA |
3114 | static void io_req_map_rw(struct io_kiocb *req, const struct iovec *iovec, |
3115 | const struct iovec *fast_iov, struct iov_iter *iter) | |
f67676d1 | 3116 | { |
e8c2bc1f | 3117 | struct io_async_rw *rw = req->async_data; |
b64e3444 | 3118 | |
ff6165b2 | 3119 | memcpy(&rw->iter, iter, sizeof(*iter)); |
afb87658 | 3120 | rw->free_iovec = iovec; |
227c0c96 | 3121 | rw->bytes_done = 0; |
ff6165b2 | 3122 | /* can only be fixed buffers, no need to do anything */ |
9c3a205c | 3123 | if (iov_iter_is_bvec(iter)) |
ff6165b2 | 3124 | return; |
b64e3444 | 3125 | if (!iovec) { |
ff6165b2 JA |
3126 | unsigned iov_off = 0; |
3127 | ||
3128 | rw->iter.iov = rw->fast_iov; | |
3129 | if (iter->iov != fast_iov) { | |
3130 | iov_off = iter->iov - fast_iov; | |
3131 | rw->iter.iov += iov_off; | |
3132 | } | |
3133 | if (rw->fast_iov != fast_iov) | |
3134 | memcpy(rw->fast_iov + iov_off, fast_iov + iov_off, | |
45097dae | 3135 | sizeof(struct iovec) * iter->nr_segs); |
99bc4c38 PB |
3136 | } else { |
3137 | req->flags |= REQ_F_NEED_CLEANUP; | |
f67676d1 JA |
3138 | } |
3139 | } | |
3140 | ||
6cb78689 | 3141 | static inline int io_alloc_async_data(struct io_kiocb *req) |
3d9932a8 | 3142 | { |
e8c2bc1f JA |
3143 | WARN_ON_ONCE(!io_op_defs[req->opcode].async_size); |
3144 | req->async_data = kmalloc(io_op_defs[req->opcode].async_size, GFP_KERNEL); | |
3145 | return req->async_data == NULL; | |
3d9932a8 XW |
3146 | } |
3147 | ||
ff6165b2 JA |
3148 | static int io_setup_async_rw(struct io_kiocb *req, const struct iovec *iovec, |
3149 | const struct iovec *fast_iov, | |
227c0c96 | 3150 | struct iov_iter *iter, bool force) |
b7bb4f7d | 3151 | { |
26f0505a | 3152 | if (!force && !io_op_defs[req->opcode].needs_async_setup) |
74566df3 | 3153 | return 0; |
e8c2bc1f | 3154 | if (!req->async_data) { |
6cb78689 | 3155 | if (io_alloc_async_data(req)) { |
6bf985dc | 3156 | kfree(iovec); |
5d204bcf | 3157 | return -ENOMEM; |
6bf985dc | 3158 | } |
b7bb4f7d | 3159 | |
ff6165b2 | 3160 | io_req_map_rw(req, iovec, fast_iov, iter); |
5d204bcf | 3161 | } |
b7bb4f7d | 3162 | return 0; |
f67676d1 JA |
3163 | } |
3164 | ||
73debe68 | 3165 | static inline int io_rw_prep_async(struct io_kiocb *req, int rw) |
c3e330a4 | 3166 | { |
e8c2bc1f | 3167 | struct io_async_rw *iorw = req->async_data; |
f4bff104 | 3168 | struct iovec *iov = iorw->fast_iov; |
847595de | 3169 | int ret; |
c3e330a4 | 3170 | |
2846c481 | 3171 | ret = io_import_iovec(rw, req, &iov, &iorw->iter, false); |
c3e330a4 PB |
3172 | if (unlikely(ret < 0)) |
3173 | return ret; | |
3174 | ||
ab0b196c PB |
3175 | iorw->bytes_done = 0; |
3176 | iorw->free_iovec = iov; | |
3177 | if (iov) | |
3178 | req->flags |= REQ_F_NEED_CLEANUP; | |
c3e330a4 PB |
3179 | return 0; |
3180 | } | |
3181 | ||
73debe68 | 3182 | static int io_read_prep(struct io_kiocb *req, const struct io_uring_sqe *sqe) |
f67676d1 | 3183 | { |
3529d8c2 JA |
3184 | if (unlikely(!(req->file->f_mode & FMODE_READ))) |
3185 | return -EBADF; | |
93642ef8 | 3186 | return io_prep_rw(req, sqe); |
f67676d1 JA |
3187 | } |
3188 | ||
c1dd91d1 JA |
3189 | /* |
3190 | * This is our waitqueue callback handler, registered through lock_page_async() | |
3191 | * when we initially tried to do the IO with the iocb armed our waitqueue. | |
3192 | * This gets called when the page is unlocked, and we generally expect that to | |
3193 | * happen when the page IO is completed and the page is now uptodate. This will | |
3194 | * queue a task_work based retry of the operation, attempting to copy the data | |
3195 | * again. If the latter fails because the page was NOT uptodate, then we will | |
3196 | * do a thread based blocking retry of the operation. That's the unexpected | |
3197 | * slow path. | |
3198 | */ | |
bcf5a063 JA |
3199 | static int io_async_buf_func(struct wait_queue_entry *wait, unsigned mode, |
3200 | int sync, void *arg) | |
3201 | { | |
3202 | struct wait_page_queue *wpq; | |
3203 | struct io_kiocb *req = wait->private; | |
bcf5a063 | 3204 | struct wait_page_key *key = arg; |
bcf5a063 JA |
3205 | |
3206 | wpq = container_of(wait, struct wait_page_queue, wait); | |
3207 | ||
cdc8fcb4 LT |
3208 | if (!wake_page_match(wpq, key)) |
3209 | return 0; | |
3210 | ||
c8d317aa | 3211 | req->rw.kiocb.ki_flags &= ~IOCB_WAITQ; |
bcf5a063 JA |
3212 | list_del_init(&wait->entry); |
3213 | ||
bcf5a063 | 3214 | /* submit ref gets dropped, acquire a new one */ |
de9b4cca | 3215 | req_ref_get(req); |
921b9054 | 3216 | io_req_task_queue(req); |
bcf5a063 JA |
3217 | return 1; |
3218 | } | |
3219 | ||
c1dd91d1 JA |
3220 | /* |
3221 | * This controls whether a given IO request should be armed for async page | |
3222 | * based retry. If we return false here, the request is handed to the async | |
3223 | * worker threads for retry. If we're doing buffered reads on a regular file, | |
3224 | * we prepare a private wait_page_queue entry and retry the operation. This | |
3225 | * will either succeed because the page is now uptodate and unlocked, or it | |
3226 | * will register a callback when the page is unlocked at IO completion. Through | |
3227 | * that callback, io_uring uses task_work to setup a retry of the operation. | |
3228 | * That retry will attempt the buffered read again. The retry will generally | |
3229 | * succeed, or in rare cases where it fails, we then fall back to using the | |
3230 | * async worker threads for a blocking retry. | |
3231 | */ | |
227c0c96 | 3232 | static bool io_rw_should_retry(struct io_kiocb *req) |
f67676d1 | 3233 | { |
e8c2bc1f JA |
3234 | struct io_async_rw *rw = req->async_data; |
3235 | struct wait_page_queue *wait = &rw->wpq; | |
bcf5a063 | 3236 | struct kiocb *kiocb = &req->rw.kiocb; |
f67676d1 | 3237 | |
bcf5a063 JA |
3238 | /* never retry for NOWAIT, we just complete with -EAGAIN */ |
3239 | if (req->flags & REQ_F_NOWAIT) | |
3240 | return false; | |
f67676d1 | 3241 | |
227c0c96 | 3242 | /* Only for buffered IO */ |
3b2a4439 | 3243 | if (kiocb->ki_flags & (IOCB_DIRECT | IOCB_HIPRI)) |
bcf5a063 | 3244 | return false; |
3b2a4439 | 3245 | |
bcf5a063 JA |
3246 | /* |
3247 | * just use poll if we can, and don't attempt if the fs doesn't | |
3248 | * support callback based unlocks | |
3249 | */ | |
3250 | if (file_can_poll(req->file) || !(req->file->f_mode & FMODE_BUF_RASYNC)) | |
3251 | return false; | |
f67676d1 | 3252 | |
3b2a4439 JA |
3253 | wait->wait.func = io_async_buf_func; |
3254 | wait->wait.private = req; | |
3255 | wait->wait.flags = 0; | |
3256 | INIT_LIST_HEAD(&wait->wait.entry); | |
3257 | kiocb->ki_flags |= IOCB_WAITQ; | |
c8d317aa | 3258 | kiocb->ki_flags &= ~IOCB_NOWAIT; |
3b2a4439 | 3259 | kiocb->ki_waitq = wait; |
3b2a4439 | 3260 | return true; |
bcf5a063 JA |
3261 | } |
3262 | ||
aeab9506 | 3263 | static inline int io_iter_do_read(struct io_kiocb *req, struct iov_iter *iter) |
bcf5a063 JA |
3264 | { |
3265 | if (req->file->f_op->read_iter) | |
3266 | return call_read_iter(req->file, &req->rw.kiocb, iter); | |
2dd2111d | 3267 | else if (req->file->f_op->read) |
4017eb91 | 3268 | return loop_rw_iter(READ, req, iter); |
2dd2111d GH |
3269 | else |
3270 | return -EINVAL; | |
f67676d1 JA |
3271 | } |
3272 | ||
889fca73 | 3273 | static int io_read(struct io_kiocb *req, unsigned int issue_flags) |
2b188cc1 JA |
3274 | { |
3275 | struct iovec inline_vecs[UIO_FASTIOV], *iovec = inline_vecs; | |
9adbd45d | 3276 | struct kiocb *kiocb = &req->rw.kiocb; |
ff6165b2 | 3277 | struct iov_iter __iter, *iter = &__iter; |
e8c2bc1f | 3278 | struct io_async_rw *rw = req->async_data; |
227c0c96 | 3279 | ssize_t io_size, ret, ret2; |
45d189c6 | 3280 | bool force_nonblock = issue_flags & IO_URING_F_NONBLOCK; |
ff6165b2 | 3281 | |
2846c481 | 3282 | if (rw) { |
e8c2bc1f | 3283 | iter = &rw->iter; |
2846c481 PB |
3284 | iovec = NULL; |
3285 | } else { | |
3286 | ret = io_import_iovec(READ, req, &iovec, iter, !force_nonblock); | |
3287 | if (ret < 0) | |
3288 | return ret; | |
3289 | } | |
632546c4 | 3290 | io_size = iov_iter_count(iter); |
fa15bafb | 3291 | req->result = io_size; |
2b188cc1 | 3292 | |
fd6c2e4c JA |
3293 | /* Ensure we clear previously set non-block flag */ |
3294 | if (!force_nonblock) | |
29de5f6a | 3295 | kiocb->ki_flags &= ~IOCB_NOWAIT; |
a88fc400 PB |
3296 | else |
3297 | kiocb->ki_flags |= IOCB_NOWAIT; | |
3298 | ||
24c74678 | 3299 | /* If the file doesn't support async, just async punt */ |
b191e2df | 3300 | if (force_nonblock && !io_file_supports_nowait(req, READ)) { |
6713e7a6 | 3301 | ret = io_setup_async_rw(req, iovec, inline_vecs, iter, true); |
6bf985dc | 3302 | return ret ?: -EAGAIN; |
6713e7a6 | 3303 | } |
9e645e11 | 3304 | |
632546c4 | 3305 | ret = rw_verify_area(READ, req->file, io_kiocb_ppos(kiocb), io_size); |
5ea5dd45 PB |
3306 | if (unlikely(ret)) { |
3307 | kfree(iovec); | |
3308 | return ret; | |
3309 | } | |
2b188cc1 | 3310 | |
227c0c96 | 3311 | ret = io_iter_do_read(req, iter); |
32960613 | 3312 | |
230d50d4 | 3313 | if (ret == -EAGAIN || (req->flags & REQ_F_REISSUE)) { |
6ad7f233 | 3314 | req->flags &= ~REQ_F_REISSUE; |
eefdf30f JA |
3315 | /* IOPOLL retry should happen for io-wq threads */ |
3316 | if (!force_nonblock && !(req->ctx->flags & IORING_SETUP_IOPOLL)) | |
f91daf56 | 3317 | goto done; |
75c668cd PB |
3318 | /* no retry on NONBLOCK nor RWF_NOWAIT */ |
3319 | if (req->flags & REQ_F_NOWAIT) | |
355afaeb | 3320 | goto done; |
84216315 | 3321 | /* some cases will consume bytes even on error returns */ |
632546c4 | 3322 | iov_iter_revert(iter, io_size - iov_iter_count(iter)); |
f38c7e3a | 3323 | ret = 0; |
230d50d4 JA |
3324 | } else if (ret == -EIOCBQUEUED) { |
3325 | goto out_free; | |
7335e3bf | 3326 | } else if (ret <= 0 || ret == io_size || !force_nonblock || |
75c668cd | 3327 | (req->flags & REQ_F_NOWAIT) || !(req->flags & REQ_F_ISREG)) { |
7335e3bf | 3328 | /* read all, failed, already did sync or don't want to retry */ |
00d23d51 | 3329 | goto done; |
227c0c96 JA |
3330 | } |
3331 | ||
227c0c96 | 3332 | ret2 = io_setup_async_rw(req, iovec, inline_vecs, iter, true); |
6bf985dc PB |
3333 | if (ret2) |
3334 | return ret2; | |
3335 | ||
fe1cdd55 | 3336 | iovec = NULL; |
e8c2bc1f | 3337 | rw = req->async_data; |
227c0c96 | 3338 | /* now use our persistent iterator, if we aren't already */ |
e8c2bc1f | 3339 | iter = &rw->iter; |
227c0c96 | 3340 | |
b23df91b PB |
3341 | do { |
3342 | io_size -= ret; | |
3343 | rw->bytes_done += ret; | |
3344 | /* if we can retry, do so with the callbacks armed */ | |
3345 | if (!io_rw_should_retry(req)) { | |
3346 | kiocb->ki_flags &= ~IOCB_WAITQ; | |
3347 | return -EAGAIN; | |
3348 | } | |
3349 | ||
3350 | /* | |
3351 | * Now retry read with the IOCB_WAITQ parts set in the iocb. If | |
3352 | * we get -EIOCBQUEUED, then we'll get a notification when the | |
3353 | * desired page gets unlocked. We can also get a partial read | |
3354 | * here, and if we do, then just retry at the new offset. | |
3355 | */ | |
3356 | ret = io_iter_do_read(req, iter); | |
3357 | if (ret == -EIOCBQUEUED) | |
3358 | return 0; | |
227c0c96 | 3359 | /* we got some bytes, but not all. retry. */ |
b5b0ecb7 | 3360 | kiocb->ki_flags &= ~IOCB_WAITQ; |
b23df91b | 3361 | } while (ret > 0 && ret < io_size); |
227c0c96 | 3362 | done: |
889fca73 | 3363 | kiocb_done(kiocb, ret, issue_flags); |
fe1cdd55 PB |
3364 | out_free: |
3365 | /* it's faster to check here then delegate to kfree */ | |
3366 | if (iovec) | |
3367 | kfree(iovec); | |
5ea5dd45 | 3368 | return 0; |
2b188cc1 JA |
3369 | } |
3370 | ||
73debe68 | 3371 | static int io_write_prep(struct io_kiocb *req, const struct io_uring_sqe *sqe) |
f67676d1 | 3372 | { |
3529d8c2 JA |
3373 | if (unlikely(!(req->file->f_mode & FMODE_WRITE))) |
3374 | return -EBADF; | |
93642ef8 | 3375 | return io_prep_rw(req, sqe); |
f67676d1 JA |
3376 | } |
3377 | ||
889fca73 | 3378 | static int io_write(struct io_kiocb *req, unsigned int issue_flags) |
2b188cc1 JA |
3379 | { |
3380 | struct iovec inline_vecs[UIO_FASTIOV], *iovec = inline_vecs; | |
9adbd45d | 3381 | struct kiocb *kiocb = &req->rw.kiocb; |
ff6165b2 | 3382 | struct iov_iter __iter, *iter = &__iter; |
e8c2bc1f | 3383 | struct io_async_rw *rw = req->async_data; |
fa15bafb | 3384 | ssize_t ret, ret2, io_size; |
45d189c6 | 3385 | bool force_nonblock = issue_flags & IO_URING_F_NONBLOCK; |
2b188cc1 | 3386 | |
2846c481 | 3387 | if (rw) { |
e8c2bc1f | 3388 | iter = &rw->iter; |
2846c481 PB |
3389 | iovec = NULL; |
3390 | } else { | |
3391 | ret = io_import_iovec(WRITE, req, &iovec, iter, !force_nonblock); | |
3392 | if (ret < 0) | |
3393 | return ret; | |
3394 | } | |
632546c4 | 3395 | io_size = iov_iter_count(iter); |
fa15bafb | 3396 | req->result = io_size; |
2b188cc1 | 3397 | |
fd6c2e4c JA |
3398 | /* Ensure we clear previously set non-block flag */ |
3399 | if (!force_nonblock) | |
a88fc400 PB |
3400 | kiocb->ki_flags &= ~IOCB_NOWAIT; |
3401 | else | |
3402 | kiocb->ki_flags |= IOCB_NOWAIT; | |
fd6c2e4c | 3403 | |
24c74678 | 3404 | /* If the file doesn't support async, just async punt */ |
b191e2df | 3405 | if (force_nonblock && !io_file_supports_nowait(req, WRITE)) |
f67676d1 | 3406 | goto copy_iov; |
31b51510 | 3407 | |
10d59345 JA |
3408 | /* file path doesn't support NOWAIT for non-direct_IO */ |
3409 | if (force_nonblock && !(kiocb->ki_flags & IOCB_DIRECT) && | |
3410 | (req->flags & REQ_F_ISREG)) | |
f67676d1 | 3411 | goto copy_iov; |
31b51510 | 3412 | |
632546c4 | 3413 | ret = rw_verify_area(WRITE, req->file, io_kiocb_ppos(kiocb), io_size); |
fa15bafb PB |
3414 | if (unlikely(ret)) |
3415 | goto out_free; | |
4ed734b0 | 3416 | |
fa15bafb PB |
3417 | /* |
3418 | * Open-code file_start_write here to grab freeze protection, | |
3419 | * which will be released by another thread in | |
3420 | * io_complete_rw(). Fool lockdep by telling it the lock got | |
3421 | * released so that it doesn't complain about the held lock when | |
3422 | * we return to userspace. | |
3423 | */ | |
3424 | if (req->flags & REQ_F_ISREG) { | |
8a3c84b6 | 3425 | sb_start_write(file_inode(req->file)->i_sb); |
fa15bafb PB |
3426 | __sb_writers_release(file_inode(req->file)->i_sb, |
3427 | SB_FREEZE_WRITE); | |
3428 | } | |
3429 | kiocb->ki_flags |= IOCB_WRITE; | |
4ed734b0 | 3430 | |
fa15bafb | 3431 | if (req->file->f_op->write_iter) |
ff6165b2 | 3432 | ret2 = call_write_iter(req->file, kiocb, iter); |
2dd2111d | 3433 | else if (req->file->f_op->write) |
4017eb91 | 3434 | ret2 = loop_rw_iter(WRITE, req, iter); |
2dd2111d GH |
3435 | else |
3436 | ret2 = -EINVAL; | |
4ed734b0 | 3437 | |
6ad7f233 PB |
3438 | if (req->flags & REQ_F_REISSUE) { |
3439 | req->flags &= ~REQ_F_REISSUE; | |
230d50d4 | 3440 | ret2 = -EAGAIN; |
6ad7f233 | 3441 | } |
230d50d4 | 3442 | |
fa15bafb PB |
3443 | /* |
3444 | * Raw bdev writes will return -EOPNOTSUPP for IOCB_NOWAIT. Just | |
3445 | * retry them without IOCB_NOWAIT. | |
3446 | */ | |
3447 | if (ret2 == -EOPNOTSUPP && (kiocb->ki_flags & IOCB_NOWAIT)) | |
3448 | ret2 = -EAGAIN; | |
75c668cd PB |
3449 | /* no retry on NONBLOCK nor RWF_NOWAIT */ |
3450 | if (ret2 == -EAGAIN && (req->flags & REQ_F_NOWAIT)) | |
355afaeb | 3451 | goto done; |
fa15bafb | 3452 | if (!force_nonblock || ret2 != -EAGAIN) { |
eefdf30f JA |
3453 | /* IOPOLL retry should happen for io-wq threads */ |
3454 | if ((req->ctx->flags & IORING_SETUP_IOPOLL) && ret2 == -EAGAIN) | |
3455 | goto copy_iov; | |
355afaeb | 3456 | done: |
889fca73 | 3457 | kiocb_done(kiocb, ret2, issue_flags); |
fa15bafb | 3458 | } else { |
f67676d1 | 3459 | copy_iov: |
84216315 | 3460 | /* some cases will consume bytes even on error returns */ |
632546c4 | 3461 | iov_iter_revert(iter, io_size - iov_iter_count(iter)); |
227c0c96 | 3462 | ret = io_setup_async_rw(req, iovec, inline_vecs, iter, false); |
6bf985dc | 3463 | return ret ?: -EAGAIN; |
2b188cc1 | 3464 | } |
31b51510 | 3465 | out_free: |
f261c168 | 3466 | /* it's reportedly faster than delegating the null check to kfree() */ |
252917c3 | 3467 | if (iovec) |
6f2cc166 | 3468 | kfree(iovec); |
2b188cc1 JA |
3469 | return ret; |
3470 | } | |
3471 | ||
80a261fd JA |
3472 | static int io_renameat_prep(struct io_kiocb *req, |
3473 | const struct io_uring_sqe *sqe) | |
3474 | { | |
3475 | struct io_rename *ren = &req->rename; | |
3476 | const char __user *oldf, *newf; | |
3477 | ||
ed7eb259 JA |
3478 | if (unlikely(req->ctx->flags & IORING_SETUP_IOPOLL)) |
3479 | return -EINVAL; | |
3480 | if (sqe->ioprio || sqe->buf_index) | |
3481 | return -EINVAL; | |
80a261fd JA |
3482 | if (unlikely(req->flags & REQ_F_FIXED_FILE)) |
3483 | return -EBADF; | |
3484 | ||
3485 | ren->old_dfd = READ_ONCE(sqe->fd); | |
3486 | oldf = u64_to_user_ptr(READ_ONCE(sqe->addr)); | |
3487 | newf = u64_to_user_ptr(READ_ONCE(sqe->addr2)); | |
3488 | ren->new_dfd = READ_ONCE(sqe->len); | |
3489 | ren->flags = READ_ONCE(sqe->rename_flags); | |
3490 | ||
3491 | ren->oldpath = getname(oldf); | |
3492 | if (IS_ERR(ren->oldpath)) | |
3493 | return PTR_ERR(ren->oldpath); | |
3494 | ||
3495 | ren->newpath = getname(newf); | |
3496 | if (IS_ERR(ren->newpath)) { | |
3497 | putname(ren->oldpath); | |
3498 | return PTR_ERR(ren->newpath); | |
3499 | } | |
3500 | ||
3501 | req->flags |= REQ_F_NEED_CLEANUP; | |
3502 | return 0; | |
3503 | } | |
3504 | ||
45d189c6 | 3505 | static int io_renameat(struct io_kiocb *req, unsigned int issue_flags) |
80a261fd JA |
3506 | { |
3507 | struct io_rename *ren = &req->rename; | |
3508 | int ret; | |
3509 | ||
45d189c6 | 3510 | if (issue_flags & IO_URING_F_NONBLOCK) |
80a261fd JA |
3511 | return -EAGAIN; |
3512 | ||
3513 | ret = do_renameat2(ren->old_dfd, ren->oldpath, ren->new_dfd, | |
3514 | ren->newpath, ren->flags); | |
3515 | ||
3516 | req->flags &= ~REQ_F_NEED_CLEANUP; | |
3517 | if (ret < 0) | |
93d2bcd2 | 3518 | req_set_fail(req); |
80a261fd JA |
3519 | io_req_complete(req, ret); |
3520 | return 0; | |
3521 | } | |
3522 | ||
14a1143b JA |
3523 | static int io_unlinkat_prep(struct io_kiocb *req, |
3524 | const struct io_uring_sqe *sqe) | |
3525 | { | |
3526 | struct io_unlink *un = &req->unlink; | |
3527 | const char __user *fname; | |
3528 | ||
22634bc5 JA |
3529 | if (unlikely(req->ctx->flags & IORING_SETUP_IOPOLL)) |
3530 | return -EINVAL; | |
3531 | if (sqe->ioprio || sqe->off || sqe->len || sqe->buf_index) | |
3532 | return -EINVAL; | |
14a1143b JA |
3533 | if (unlikely(req->flags & REQ_F_FIXED_FILE)) |
3534 | return -EBADF; | |
3535 | ||
3536 | un->dfd = READ_ONCE(sqe->fd); | |
3537 | ||
3538 | un->flags = READ_ONCE(sqe->unlink_flags); | |
3539 | if (un->flags & ~AT_REMOVEDIR) | |
3540 | return -EINVAL; | |
3541 | ||
3542 | fname = u64_to_user_ptr(READ_ONCE(sqe->addr)); | |
3543 | un->filename = getname(fname); | |
3544 | if (IS_ERR(un->filename)) | |
3545 | return PTR_ERR(un->filename); | |
3546 | ||
3547 | req->flags |= REQ_F_NEED_CLEANUP; | |
3548 | return 0; | |
3549 | } | |
3550 | ||
45d189c6 | 3551 | static int io_unlinkat(struct io_kiocb *req, unsigned int issue_flags) |
14a1143b JA |
3552 | { |
3553 | struct io_unlink *un = &req->unlink; | |
3554 | int ret; | |
3555 | ||
45d189c6 | 3556 | if (issue_flags & IO_URING_F_NONBLOCK) |
14a1143b JA |
3557 | return -EAGAIN; |
3558 | ||
3559 | if (un->flags & AT_REMOVEDIR) | |
3560 | ret = do_rmdir(un->dfd, un->filename); | |
3561 | else | |
3562 | ret = do_unlinkat(un->dfd, un->filename); | |
3563 | ||
3564 | req->flags &= ~REQ_F_NEED_CLEANUP; | |
3565 | if (ret < 0) | |
93d2bcd2 | 3566 | req_set_fail(req); |
14a1143b JA |
3567 | io_req_complete(req, ret); |
3568 | return 0; | |
3569 | } | |
3570 | ||
36f4fa68 JA |
3571 | static int io_shutdown_prep(struct io_kiocb *req, |
3572 | const struct io_uring_sqe *sqe) | |
3573 | { | |
3574 | #if defined(CONFIG_NET) | |
3575 | if (unlikely(req->ctx->flags & IORING_SETUP_IOPOLL)) | |
3576 | return -EINVAL; | |
3577 | if (sqe->ioprio || sqe->off || sqe->addr || sqe->rw_flags || | |
3578 | sqe->buf_index) | |
3579 | return -EINVAL; | |
3580 | ||
3581 | req->shutdown.how = READ_ONCE(sqe->len); | |
3582 | return 0; | |
3583 | #else | |
3584 | return -EOPNOTSUPP; | |
3585 | #endif | |
3586 | } | |
3587 | ||
45d189c6 | 3588 | static int io_shutdown(struct io_kiocb *req, unsigned int issue_flags) |
36f4fa68 JA |
3589 | { |
3590 | #if defined(CONFIG_NET) | |
3591 | struct socket *sock; | |
3592 | int ret; | |
3593 | ||
45d189c6 | 3594 | if (issue_flags & IO_URING_F_NONBLOCK) |
36f4fa68 JA |
3595 | return -EAGAIN; |
3596 | ||
48aba79b | 3597 | sock = sock_from_file(req->file); |
36f4fa68 | 3598 | if (unlikely(!sock)) |
48aba79b | 3599 | return -ENOTSOCK; |
36f4fa68 JA |
3600 | |
3601 | ret = __sys_shutdown_sock(sock, req->shutdown.how); | |
a146468d | 3602 | if (ret < 0) |
93d2bcd2 | 3603 | req_set_fail(req); |
36f4fa68 JA |
3604 | io_req_complete(req, ret); |
3605 | return 0; | |
3606 | #else | |
3607 | return -EOPNOTSUPP; | |
3608 | #endif | |
3609 | } | |
3610 | ||
f2a8d5c7 PB |
3611 | static int __io_splice_prep(struct io_kiocb *req, |
3612 | const struct io_uring_sqe *sqe) | |
7d67af2c | 3613 | { |
fe7e3257 | 3614 | struct io_splice *sp = &req->splice; |
7d67af2c | 3615 | unsigned int valid_flags = SPLICE_F_FD_IN_FIXED | SPLICE_F_ALL; |
7d67af2c | 3616 | |
3232dd02 PB |
3617 | if (unlikely(req->ctx->flags & IORING_SETUP_IOPOLL)) |
3618 | return -EINVAL; | |
7d67af2c PB |
3619 | |
3620 | sp->file_in = NULL; | |
7d67af2c PB |
3621 | sp->len = READ_ONCE(sqe->len); |
3622 | sp->flags = READ_ONCE(sqe->splice_flags); | |
3623 | ||
3624 | if (unlikely(sp->flags & ~valid_flags)) | |
3625 | return -EINVAL; | |
3626 | ||
ac177053 PB |
3627 | sp->file_in = io_file_get(req->ctx, NULL, req, |
3628 | READ_ONCE(sqe->splice_fd_in), | |
8371adf5 PB |
3629 | (sp->flags & SPLICE_F_FD_IN_FIXED)); |
3630 | if (!sp->file_in) | |
3631 | return -EBADF; | |
7d67af2c | 3632 | req->flags |= REQ_F_NEED_CLEANUP; |
7d67af2c PB |
3633 | return 0; |
3634 | } | |
3635 | ||
f2a8d5c7 PB |
3636 | static int io_tee_prep(struct io_kiocb *req, |
3637 | const struct io_uring_sqe *sqe) | |
3638 | { | |
3639 | if (READ_ONCE(sqe->splice_off_in) || READ_ONCE(sqe->off)) | |
3640 | return -EINVAL; | |
3641 | return __io_splice_prep(req, sqe); | |
3642 | } | |
3643 | ||
45d189c6 | 3644 | static int io_tee(struct io_kiocb *req, unsigned int issue_flags) |
f2a8d5c7 PB |
3645 | { |
3646 | struct io_splice *sp = &req->splice; | |
3647 | struct file *in = sp->file_in; | |
3648 | struct file *out = sp->file_out; | |
3649 | unsigned int flags = sp->flags & ~SPLICE_F_FD_IN_FIXED; | |
3650 | long ret = 0; | |
3651 | ||
45d189c6 | 3652 | if (issue_flags & IO_URING_F_NONBLOCK) |
f2a8d5c7 PB |
3653 | return -EAGAIN; |
3654 | if (sp->len) | |
3655 | ret = do_tee(in, out, sp->len, flags); | |
3656 | ||
e1d767f0 PB |
3657 | if (!(sp->flags & SPLICE_F_FD_IN_FIXED)) |
3658 | io_put_file(in); | |
f2a8d5c7 PB |
3659 | req->flags &= ~REQ_F_NEED_CLEANUP; |
3660 | ||
f2a8d5c7 | 3661 | if (ret != sp->len) |
93d2bcd2 | 3662 | req_set_fail(req); |
e1e16097 | 3663 | io_req_complete(req, ret); |
f2a8d5c7 PB |
3664 | return 0; |
3665 | } | |
3666 | ||
3667 | static int io_splice_prep(struct io_kiocb *req, const struct io_uring_sqe *sqe) | |
3668 | { | |
fe7e3257 | 3669 | struct io_splice *sp = &req->splice; |
f2a8d5c7 PB |
3670 | |
3671 | sp->off_in = READ_ONCE(sqe->splice_off_in); | |
3672 | sp->off_out = READ_ONCE(sqe->off); | |
3673 | return __io_splice_prep(req, sqe); | |
3674 | } | |
3675 | ||
45d189c6 | 3676 | static int io_splice(struct io_kiocb *req, unsigned int issue_flags) |
7d67af2c PB |
3677 | { |
3678 | struct io_splice *sp = &req->splice; | |
3679 | struct file *in = sp->file_in; | |
3680 | struct file *out = sp->file_out; | |
3681 | unsigned int flags = sp->flags & ~SPLICE_F_FD_IN_FIXED; | |
3682 | loff_t *poff_in, *poff_out; | |
c9687426 | 3683 | long ret = 0; |
7d67af2c | 3684 | |
45d189c6 | 3685 | if (issue_flags & IO_URING_F_NONBLOCK) |
2fb3e822 | 3686 | return -EAGAIN; |
7d67af2c PB |
3687 | |
3688 | poff_in = (sp->off_in == -1) ? NULL : &sp->off_in; | |
3689 | poff_out = (sp->off_out == -1) ? NULL : &sp->off_out; | |
c9687426 | 3690 | |
948a7749 | 3691 | if (sp->len) |
c9687426 | 3692 | ret = do_splice(in, poff_in, out, poff_out, sp->len, flags); |
7d67af2c | 3693 | |
e1d767f0 PB |
3694 | if (!(sp->flags & SPLICE_F_FD_IN_FIXED)) |
3695 | io_put_file(in); | |
7d67af2c PB |
3696 | req->flags &= ~REQ_F_NEED_CLEANUP; |
3697 | ||
7d67af2c | 3698 | if (ret != sp->len) |
93d2bcd2 | 3699 | req_set_fail(req); |
e1e16097 | 3700 | io_req_complete(req, ret); |
7d67af2c PB |
3701 | return 0; |
3702 | } | |
3703 | ||
2b188cc1 JA |
3704 | /* |
3705 | * IORING_OP_NOP just posts a completion event, nothing else. | |
3706 | */ | |
889fca73 | 3707 | static int io_nop(struct io_kiocb *req, unsigned int issue_flags) |
2b188cc1 JA |
3708 | { |
3709 | struct io_ring_ctx *ctx = req->ctx; | |
2b188cc1 | 3710 | |
def596e9 JA |
3711 | if (unlikely(ctx->flags & IORING_SETUP_IOPOLL)) |
3712 | return -EINVAL; | |
3713 | ||
889fca73 | 3714 | __io_req_complete(req, issue_flags, 0, 0); |
2b188cc1 JA |
3715 | return 0; |
3716 | } | |
3717 | ||
1155c76a | 3718 | static int io_fsync_prep(struct io_kiocb *req, const struct io_uring_sqe *sqe) |
c992fe29 | 3719 | { |
6b06314c | 3720 | struct io_ring_ctx *ctx = req->ctx; |
c992fe29 | 3721 | |
09bb8394 JA |
3722 | if (!req->file) |
3723 | return -EBADF; | |
c992fe29 | 3724 | |
6b06314c | 3725 | if (unlikely(ctx->flags & IORING_SETUP_IOPOLL)) |
def596e9 | 3726 | return -EINVAL; |
edafccee | 3727 | if (unlikely(sqe->addr || sqe->ioprio || sqe->buf_index)) |
c992fe29 CH |
3728 | return -EINVAL; |
3729 | ||
8ed8d3c3 JA |
3730 | req->sync.flags = READ_ONCE(sqe->fsync_flags); |
3731 | if (unlikely(req->sync.flags & ~IORING_FSYNC_DATASYNC)) | |
3732 | return -EINVAL; | |
3733 | ||
3734 | req->sync.off = READ_ONCE(sqe->off); | |
3735 | req->sync.len = READ_ONCE(sqe->len); | |
c992fe29 CH |
3736 | return 0; |
3737 | } | |
3738 | ||
45d189c6 | 3739 | static int io_fsync(struct io_kiocb *req, unsigned int issue_flags) |
8ed8d3c3 | 3740 | { |
8ed8d3c3 | 3741 | loff_t end = req->sync.off + req->sync.len; |
8ed8d3c3 JA |
3742 | int ret; |
3743 | ||
ac45abc0 | 3744 | /* fsync always requires a blocking context */ |
45d189c6 | 3745 | if (issue_flags & IO_URING_F_NONBLOCK) |
ac45abc0 PB |
3746 | return -EAGAIN; |
3747 | ||
9adbd45d | 3748 | ret = vfs_fsync_range(req->file, req->sync.off, |
8ed8d3c3 JA |
3749 | end > 0 ? end : LLONG_MAX, |
3750 | req->sync.flags & IORING_FSYNC_DATASYNC); | |
3751 | if (ret < 0) | |
93d2bcd2 | 3752 | req_set_fail(req); |
e1e16097 | 3753 | io_req_complete(req, ret); |
c992fe29 CH |
3754 | return 0; |
3755 | } | |
3756 | ||
d63d1b5e JA |
3757 | static int io_fallocate_prep(struct io_kiocb *req, |
3758 | const struct io_uring_sqe *sqe) | |
3759 | { | |
3760 | if (sqe->ioprio || sqe->buf_index || sqe->rw_flags) | |
3761 | return -EINVAL; | |
3232dd02 PB |
3762 | if (unlikely(req->ctx->flags & IORING_SETUP_IOPOLL)) |
3763 | return -EINVAL; | |
d63d1b5e JA |
3764 | |
3765 | req->sync.off = READ_ONCE(sqe->off); | |
3766 | req->sync.len = READ_ONCE(sqe->addr); | |
3767 | req->sync.mode = READ_ONCE(sqe->len); | |
3768 | return 0; | |
3769 | } | |
3770 | ||
45d189c6 | 3771 | static int io_fallocate(struct io_kiocb *req, unsigned int issue_flags) |
5d17b4a4 | 3772 | { |
ac45abc0 PB |
3773 | int ret; |
3774 | ||
d63d1b5e | 3775 | /* fallocate always requiring blocking context */ |
45d189c6 | 3776 | if (issue_flags & IO_URING_F_NONBLOCK) |
5d17b4a4 | 3777 | return -EAGAIN; |
ac45abc0 PB |
3778 | ret = vfs_fallocate(req->file, req->sync.mode, req->sync.off, |
3779 | req->sync.len); | |
ac45abc0 | 3780 | if (ret < 0) |
93d2bcd2 | 3781 | req_set_fail(req); |
e1e16097 | 3782 | io_req_complete(req, ret); |
5d17b4a4 JA |
3783 | return 0; |
3784 | } | |
3785 | ||
ec65fea5 | 3786 | static int __io_openat_prep(struct io_kiocb *req, const struct io_uring_sqe *sqe) |
b7bb4f7d | 3787 | { |
f8748881 | 3788 | const char __user *fname; |
15b71abe | 3789 | int ret; |
b7bb4f7d | 3790 | |
d3fddf6d PB |
3791 | if (unlikely(req->ctx->flags & IORING_SETUP_IOPOLL)) |
3792 | return -EINVAL; | |
ec65fea5 | 3793 | if (unlikely(sqe->ioprio || sqe->buf_index)) |
15b71abe | 3794 | return -EINVAL; |
ec65fea5 | 3795 | if (unlikely(req->flags & REQ_F_FIXED_FILE)) |
cf3040ca | 3796 | return -EBADF; |
03b1230c | 3797 | |
ec65fea5 PB |
3798 | /* open.how should be already initialised */ |
3799 | if (!(req->open.how.flags & O_PATH) && force_o_largefile()) | |
08a1d26e | 3800 | req->open.how.flags |= O_LARGEFILE; |
3529d8c2 | 3801 | |
25e72d10 PB |
3802 | req->open.dfd = READ_ONCE(sqe->fd); |
3803 | fname = u64_to_user_ptr(READ_ONCE(sqe->addr)); | |
f8748881 | 3804 | req->open.filename = getname(fname); |
15b71abe JA |
3805 | if (IS_ERR(req->open.filename)) { |
3806 | ret = PTR_ERR(req->open.filename); | |
3807 | req->open.filename = NULL; | |
3808 | return ret; | |
3809 | } | |
4022e7af | 3810 | req->open.nofile = rlimit(RLIMIT_NOFILE); |
8fef80bf | 3811 | req->flags |= REQ_F_NEED_CLEANUP; |
15b71abe | 3812 | return 0; |
03b1230c JA |
3813 | } |
3814 | ||
ec65fea5 PB |
3815 | static int io_openat_prep(struct io_kiocb *req, const struct io_uring_sqe *sqe) |
3816 | { | |
d3fddf6d PB |
3817 | u64 mode = READ_ONCE(sqe->len); |
3818 | u64 flags = READ_ONCE(sqe->open_flags); | |
ec65fea5 | 3819 | |
ec65fea5 PB |
3820 | req->open.how = build_open_how(flags, mode); |
3821 | return __io_openat_prep(req, sqe); | |
3822 | } | |
3823 | ||
cebdb986 | 3824 | static int io_openat2_prep(struct io_kiocb *req, const struct io_uring_sqe *sqe) |
aa1fa28f | 3825 | { |
cebdb986 | 3826 | struct open_how __user *how; |
cebdb986 | 3827 | size_t len; |
0fa03c62 JA |
3828 | int ret; |
3829 | ||
cebdb986 JA |
3830 | how = u64_to_user_ptr(READ_ONCE(sqe->addr2)); |
3831 | len = READ_ONCE(sqe->len); | |
cebdb986 JA |
3832 | if (len < OPEN_HOW_SIZE_VER0) |
3833 | return -EINVAL; | |
3529d8c2 | 3834 | |
cebdb986 JA |
3835 | ret = copy_struct_from_user(&req->open.how, sizeof(req->open.how), how, |
3836 | len); | |
3837 | if (ret) | |
3838 | return ret; | |
3529d8c2 | 3839 | |
ec65fea5 | 3840 | return __io_openat_prep(req, sqe); |
cebdb986 JA |
3841 | } |
3842 | ||
45d189c6 | 3843 | static int io_openat2(struct io_kiocb *req, unsigned int issue_flags) |
15b71abe JA |
3844 | { |
3845 | struct open_flags op; | |
15b71abe | 3846 | struct file *file; |
3a81fd02 JA |
3847 | bool nonblock_set; |
3848 | bool resolve_nonblock; | |
15b71abe JA |
3849 | int ret; |
3850 | ||
cebdb986 | 3851 | ret = build_open_flags(&req->open.how, &op); |
15b71abe JA |
3852 | if (ret) |
3853 | goto err; | |
3a81fd02 JA |
3854 | nonblock_set = op.open_flag & O_NONBLOCK; |
3855 | resolve_nonblock = req->open.how.resolve & RESOLVE_CACHED; | |
45d189c6 | 3856 | if (issue_flags & IO_URING_F_NONBLOCK) { |
3a81fd02 JA |
3857 | /* |
3858 | * Don't bother trying for O_TRUNC, O_CREAT, or O_TMPFILE open, | |
3859 | * it'll always -EAGAIN | |
3860 | */ | |
3861 | if (req->open.how.flags & (O_TRUNC | O_CREAT | O_TMPFILE)) | |
3862 | return -EAGAIN; | |
3863 | op.lookup_flags |= LOOKUP_CACHED; | |
3864 | op.open_flag |= O_NONBLOCK; | |
3865 | } | |
15b71abe | 3866 | |
4022e7af | 3867 | ret = __get_unused_fd_flags(req->open.how.flags, req->open.nofile); |
15b71abe JA |
3868 | if (ret < 0) |
3869 | goto err; | |
3870 | ||
3871 | file = do_filp_open(req->open.dfd, req->open.filename, &op); | |
12dcb58a | 3872 | if (IS_ERR(file)) { |
944d1444 | 3873 | /* |
12dcb58a PB |
3874 | * We could hang on to this 'fd' on retrying, but seems like |
3875 | * marginal gain for something that is now known to be a slower | |
3876 | * path. So just put it, and we'll get a new one when we retry. | |
944d1444 | 3877 | */ |
3a81fd02 | 3878 | put_unused_fd(ret); |
3a81fd02 | 3879 | |
15b71abe | 3880 | ret = PTR_ERR(file); |
12dcb58a PB |
3881 | /* only retry if RESOLVE_CACHED wasn't already set by application */ |
3882 | if (ret == -EAGAIN && | |
3883 | (!resolve_nonblock && (issue_flags & IO_URING_F_NONBLOCK))) | |
3884 | return -EAGAIN; | |
3885 | goto err; | |
15b71abe | 3886 | } |
12dcb58a PB |
3887 | |
3888 | if ((issue_flags & IO_URING_F_NONBLOCK) && !nonblock_set) | |
3889 | file->f_flags &= ~O_NONBLOCK; | |
3890 | fsnotify_open(file); | |
3891 | fd_install(ret, file); | |
15b71abe JA |
3892 | err: |
3893 | putname(req->open.filename); | |
8fef80bf | 3894 | req->flags &= ~REQ_F_NEED_CLEANUP; |
15b71abe | 3895 | if (ret < 0) |
93d2bcd2 | 3896 | req_set_fail(req); |
0bdf3398 | 3897 | __io_req_complete(req, issue_flags, ret, 0); |
15b71abe JA |
3898 | return 0; |
3899 | } | |
3900 | ||
45d189c6 | 3901 | static int io_openat(struct io_kiocb *req, unsigned int issue_flags) |
cebdb986 | 3902 | { |
e45cff58 | 3903 | return io_openat2(req, issue_flags); |
cebdb986 JA |
3904 | } |
3905 | ||
067524e9 JA |
3906 | static int io_remove_buffers_prep(struct io_kiocb *req, |
3907 | const struct io_uring_sqe *sqe) | |
3908 | { | |
3909 | struct io_provide_buf *p = &req->pbuf; | |
3910 | u64 tmp; | |
3911 | ||
3912 | if (sqe->ioprio || sqe->rw_flags || sqe->addr || sqe->len || sqe->off) | |
3913 | return -EINVAL; | |
3914 | ||
3915 | tmp = READ_ONCE(sqe->fd); | |
3916 | if (!tmp || tmp > USHRT_MAX) | |
3917 | return -EINVAL; | |
3918 | ||
3919 | memset(p, 0, sizeof(*p)); | |
3920 | p->nbufs = tmp; | |
3921 | p->bgid = READ_ONCE(sqe->buf_group); | |
3922 | return 0; | |
3923 | } | |
3924 | ||
3925 | static int __io_remove_buffers(struct io_ring_ctx *ctx, struct io_buffer *buf, | |
3926 | int bgid, unsigned nbufs) | |
3927 | { | |
3928 | unsigned i = 0; | |
3929 | ||
3930 | /* shouldn't happen */ | |
3931 | if (!nbufs) | |
3932 | return 0; | |
3933 | ||
3934 | /* the head kbuf is the list itself */ | |
3935 | while (!list_empty(&buf->list)) { | |
3936 | struct io_buffer *nxt; | |
3937 | ||
3938 | nxt = list_first_entry(&buf->list, struct io_buffer, list); | |
3939 | list_del(&nxt->list); | |
3940 | kfree(nxt); | |
3941 | if (++i == nbufs) | |
3942 | return i; | |
3943 | } | |
3944 | i++; | |
3945 | kfree(buf); | |
9e15c3a0 | 3946 | xa_erase(&ctx->io_buffers, bgid); |
067524e9 JA |
3947 | |
3948 | return i; | |
3949 | } | |
3950 | ||
889fca73 | 3951 | static int io_remove_buffers(struct io_kiocb *req, unsigned int issue_flags) |
067524e9 JA |
3952 | { |
3953 | struct io_provide_buf *p = &req->pbuf; | |
3954 | struct io_ring_ctx *ctx = req->ctx; | |
3955 | struct io_buffer *head; | |
3956 | int ret = 0; | |
45d189c6 | 3957 | bool force_nonblock = issue_flags & IO_URING_F_NONBLOCK; |
067524e9 JA |
3958 | |
3959 | io_ring_submit_lock(ctx, !force_nonblock); | |
3960 | ||
3961 | lockdep_assert_held(&ctx->uring_lock); | |
3962 | ||
3963 | ret = -ENOENT; | |
9e15c3a0 | 3964 | head = xa_load(&ctx->io_buffers, p->bgid); |
067524e9 JA |
3965 | if (head) |
3966 | ret = __io_remove_buffers(ctx, head, p->bgid, p->nbufs); | |
067524e9 | 3967 | if (ret < 0) |
93d2bcd2 | 3968 | req_set_fail(req); |
067524e9 | 3969 | |
9fb8cb49 PB |
3970 | /* complete before unlock, IOPOLL may need the lock */ |
3971 | __io_req_complete(req, issue_flags, ret, 0); | |
3972 | io_ring_submit_unlock(ctx, !force_nonblock); | |
067524e9 JA |
3973 | return 0; |
3974 | } | |
3975 | ||
ddf0322d JA |
3976 | static int io_provide_buffers_prep(struct io_kiocb *req, |
3977 | const struct io_uring_sqe *sqe) | |
3978 | { | |
38134ada | 3979 | unsigned long size, tmp_check; |
ddf0322d JA |
3980 | struct io_provide_buf *p = &req->pbuf; |
3981 | u64 tmp; | |
3982 | ||
3983 | if (sqe->ioprio || sqe->rw_flags) | |
3984 | return -EINVAL; | |
3985 | ||
3986 | tmp = READ_ONCE(sqe->fd); | |
3987 | if (!tmp || tmp > USHRT_MAX) | |
3988 | return -E2BIG; | |
3989 | p->nbufs = tmp; | |
3990 | p->addr = READ_ONCE(sqe->addr); | |
3991 | p->len = READ_ONCE(sqe->len); | |
3992 | ||
38134ada PB |
3993 | if (check_mul_overflow((unsigned long)p->len, (unsigned long)p->nbufs, |
3994 | &size)) | |
3995 | return -EOVERFLOW; | |
3996 | if (check_add_overflow((unsigned long)p->addr, size, &tmp_check)) | |
3997 | return -EOVERFLOW; | |
3998 | ||
d81269fe PB |
3999 | size = (unsigned long)p->len * p->nbufs; |
4000 | if (!access_ok(u64_to_user_ptr(p->addr), size)) | |
ddf0322d JA |
4001 | return -EFAULT; |
4002 | ||
4003 | p->bgid = READ_ONCE(sqe->buf_group); | |
4004 | tmp = READ_ONCE(sqe->off); | |
4005 | if (tmp > USHRT_MAX) | |
4006 | return -E2BIG; | |
4007 | p->bid = tmp; | |
4008 | return 0; | |
4009 | } | |
4010 | ||
4011 | static int io_add_buffers(struct io_provide_buf *pbuf, struct io_buffer **head) | |
4012 | { | |
4013 | struct io_buffer *buf; | |
4014 | u64 addr = pbuf->addr; | |
4015 | int i, bid = pbuf->bid; | |
4016 | ||
4017 | for (i = 0; i < pbuf->nbufs; i++) { | |
4018 | buf = kmalloc(sizeof(*buf), GFP_KERNEL); | |
4019 | if (!buf) | |
4020 | break; | |
4021 | ||
4022 | buf->addr = addr; | |
d1f82808 | 4023 | buf->len = min_t(__u32, pbuf->len, MAX_RW_COUNT); |
ddf0322d JA |
4024 | buf->bid = bid; |
4025 | addr += pbuf->len; | |
4026 | bid++; | |
4027 | if (!*head) { | |
4028 | INIT_LIST_HEAD(&buf->list); | |
4029 | *head = buf; | |
4030 | } else { | |
4031 | list_add_tail(&buf->list, &(*head)->list); | |
4032 | } | |
4033 | } | |
4034 | ||
4035 | return i ? i : -ENOMEM; | |
4036 | } | |
4037 | ||
889fca73 | 4038 | static int io_provide_buffers(struct io_kiocb *req, unsigned int issue_flags) |
ddf0322d JA |
4039 | { |
4040 | struct io_provide_buf *p = &req->pbuf; | |
4041 | struct io_ring_ctx *ctx = req->ctx; | |
4042 | struct io_buffer *head, *list; | |
4043 | int ret = 0; | |
45d189c6 | 4044 | bool force_nonblock = issue_flags & IO_URING_F_NONBLOCK; |
ddf0322d JA |
4045 | |
4046 | io_ring_submit_lock(ctx, !force_nonblock); | |
4047 | ||
4048 | lockdep_assert_held(&ctx->uring_lock); | |
4049 | ||
9e15c3a0 | 4050 | list = head = xa_load(&ctx->io_buffers, p->bgid); |
ddf0322d JA |
4051 | |
4052 | ret = io_add_buffers(p, &head); | |
9e15c3a0 JA |
4053 | if (ret >= 0 && !list) { |
4054 | ret = xa_insert(&ctx->io_buffers, p->bgid, head, GFP_KERNEL); | |
4055 | if (ret < 0) | |
067524e9 | 4056 | __io_remove_buffers(ctx, head, p->bgid, -1U); |
ddf0322d | 4057 | } |
ddf0322d | 4058 | if (ret < 0) |
93d2bcd2 | 4059 | req_set_fail(req); |
9fb8cb49 PB |
4060 | /* complete before unlock, IOPOLL may need the lock */ |
4061 | __io_req_complete(req, issue_flags, ret, 0); | |
4062 | io_ring_submit_unlock(ctx, !force_nonblock); | |
ddf0322d | 4063 | return 0; |
cebdb986 JA |
4064 | } |
4065 | ||
3e4827b0 JA |
4066 | static int io_epoll_ctl_prep(struct io_kiocb *req, |
4067 | const struct io_uring_sqe *sqe) | |
4068 | { | |
4069 | #if defined(CONFIG_EPOLL) | |
4070 | if (sqe->ioprio || sqe->buf_index) | |
4071 | return -EINVAL; | |
2d74d042 | 4072 | if (unlikely(req->ctx->flags & IORING_SETUP_IOPOLL)) |
3232dd02 | 4073 | return -EINVAL; |
3e4827b0 JA |
4074 | |
4075 | req->epoll.epfd = READ_ONCE(sqe->fd); | |
4076 | req->epoll.op = READ_ONCE(sqe->len); | |
4077 | req->epoll.fd = READ_ONCE(sqe->off); | |
4078 | ||
4079 | if (ep_op_has_event(req->epoll.op)) { | |
4080 | struct epoll_event __user *ev; | |
4081 | ||
4082 | ev = u64_to_user_ptr(READ_ONCE(sqe->addr)); | |
4083 | if (copy_from_user(&req->epoll.event, ev, sizeof(*ev))) | |
4084 | return -EFAULT; | |
4085 | } | |
4086 | ||
4087 | return 0; | |
4088 | #else | |
4089 | return -EOPNOTSUPP; | |
4090 | #endif | |
4091 | } | |
4092 | ||
889fca73 | 4093 | static int io_epoll_ctl(struct io_kiocb *req, unsigned int issue_flags) |
3e4827b0 JA |
4094 | { |
4095 | #if defined(CONFIG_EPOLL) | |
4096 | struct io_epoll *ie = &req->epoll; | |
4097 | int ret; | |
45d189c6 | 4098 | bool force_nonblock = issue_flags & IO_URING_F_NONBLOCK; |
3e4827b0 JA |
4099 | |
4100 | ret = do_epoll_ctl(ie->epfd, ie->op, ie->fd, &ie->event, force_nonblock); | |
4101 | if (force_nonblock && ret == -EAGAIN) | |
4102 | return -EAGAIN; | |
4103 | ||
4104 | if (ret < 0) | |
93d2bcd2 | 4105 | req_set_fail(req); |
889fca73 | 4106 | __io_req_complete(req, issue_flags, ret, 0); |
3e4827b0 JA |
4107 | return 0; |
4108 | #else | |
4109 | return -EOPNOTSUPP; | |
4110 | #endif | |
4111 | } | |
4112 | ||
c1ca757b JA |
4113 | static int io_madvise_prep(struct io_kiocb *req, const struct io_uring_sqe *sqe) |
4114 | { | |
4115 | #if defined(CONFIG_ADVISE_SYSCALLS) && defined(CONFIG_MMU) | |
4116 | if (sqe->ioprio || sqe->buf_index || sqe->off) | |
4117 | return -EINVAL; | |
3232dd02 PB |
4118 | if (unlikely(req->ctx->flags & IORING_SETUP_IOPOLL)) |
4119 | return -EINVAL; | |
c1ca757b JA |
4120 | |
4121 | req->madvise.addr = READ_ONCE(sqe->addr); | |
4122 | req->madvise.len = READ_ONCE(sqe->len); | |
4123 | req->madvise.advice = READ_ONCE(sqe->fadvise_advice); | |
4124 | return 0; | |
4125 | #else | |
4126 | return -EOPNOTSUPP; | |
4127 | #endif | |
4128 | } | |
4129 | ||
45d189c6 | 4130 | static int io_madvise(struct io_kiocb *req, unsigned int issue_flags) |
c1ca757b JA |
4131 | { |
4132 | #if defined(CONFIG_ADVISE_SYSCALLS) && defined(CONFIG_MMU) | |
4133 | struct io_madvise *ma = &req->madvise; | |
4134 | int ret; | |
4135 | ||
45d189c6 | 4136 | if (issue_flags & IO_URING_F_NONBLOCK) |
c1ca757b JA |
4137 | return -EAGAIN; |
4138 | ||
0726b01e | 4139 | ret = do_madvise(current->mm, ma->addr, ma->len, ma->advice); |
c1ca757b | 4140 | if (ret < 0) |
93d2bcd2 | 4141 | req_set_fail(req); |
e1e16097 | 4142 | io_req_complete(req, ret); |
c1ca757b JA |
4143 | return 0; |
4144 | #else | |
4145 | return -EOPNOTSUPP; | |
4146 | #endif | |
4147 | } | |
4148 | ||
4840e418 JA |
4149 | static int io_fadvise_prep(struct io_kiocb *req, const struct io_uring_sqe *sqe) |
4150 | { | |
4151 | if (sqe->ioprio || sqe->buf_index || sqe->addr) | |
4152 | return -EINVAL; | |
3232dd02 PB |
4153 | if (unlikely(req->ctx->flags & IORING_SETUP_IOPOLL)) |
4154 | return -EINVAL; | |
4840e418 JA |
4155 | |
4156 | req->fadvise.offset = READ_ONCE(sqe->off); | |
4157 | req->fadvise.len = READ_ONCE(sqe->len); | |
4158 | req->fadvise.advice = READ_ONCE(sqe->fadvise_advice); | |
4159 | return 0; | |
4160 | } | |
4161 | ||
45d189c6 | 4162 | static int io_fadvise(struct io_kiocb *req, unsigned int issue_flags) |
4840e418 JA |
4163 | { |
4164 | struct io_fadvise *fa = &req->fadvise; | |
4165 | int ret; | |
4166 | ||
45d189c6 | 4167 | if (issue_flags & IO_URING_F_NONBLOCK) { |
3e69426d JA |
4168 | switch (fa->advice) { |
4169 | case POSIX_FADV_NORMAL: | |
4170 | case POSIX_FADV_RANDOM: | |
4171 | case POSIX_FADV_SEQUENTIAL: | |
4172 | break; | |
4173 | default: | |
4174 | return -EAGAIN; | |
4175 | } | |
4176 | } | |
4840e418 JA |
4177 | |
4178 | ret = vfs_fadvise(req->file, fa->offset, fa->len, fa->advice); | |
4179 | if (ret < 0) | |
93d2bcd2 | 4180 | req_set_fail(req); |
0bdf3398 | 4181 | __io_req_complete(req, issue_flags, ret, 0); |
4840e418 JA |
4182 | return 0; |
4183 | } | |
4184 | ||
eddc7ef5 JA |
4185 | static int io_statx_prep(struct io_kiocb *req, const struct io_uring_sqe *sqe) |
4186 | { | |
2d74d042 | 4187 | if (unlikely(req->ctx->flags & IORING_SETUP_IOPOLL)) |
3232dd02 | 4188 | return -EINVAL; |
eddc7ef5 JA |
4189 | if (sqe->ioprio || sqe->buf_index) |
4190 | return -EINVAL; | |
9c280f90 | 4191 | if (req->flags & REQ_F_FIXED_FILE) |
cf3040ca | 4192 | return -EBADF; |
eddc7ef5 | 4193 | |
1d9e1288 BM |
4194 | req->statx.dfd = READ_ONCE(sqe->fd); |
4195 | req->statx.mask = READ_ONCE(sqe->len); | |
e62753e4 | 4196 | req->statx.filename = u64_to_user_ptr(READ_ONCE(sqe->addr)); |
1d9e1288 BM |
4197 | req->statx.buffer = u64_to_user_ptr(READ_ONCE(sqe->addr2)); |
4198 | req->statx.flags = READ_ONCE(sqe->statx_flags); | |
eddc7ef5 JA |
4199 | |
4200 | return 0; | |
4201 | } | |
4202 | ||
45d189c6 | 4203 | static int io_statx(struct io_kiocb *req, unsigned int issue_flags) |
eddc7ef5 | 4204 | { |
1d9e1288 | 4205 | struct io_statx *ctx = &req->statx; |
eddc7ef5 JA |
4206 | int ret; |
4207 | ||
59d70013 | 4208 | if (issue_flags & IO_URING_F_NONBLOCK) |
eddc7ef5 JA |
4209 | return -EAGAIN; |
4210 | ||
e62753e4 BM |
4211 | ret = do_statx(ctx->dfd, ctx->filename, ctx->flags, ctx->mask, |
4212 | ctx->buffer); | |
eddc7ef5 | 4213 | |
eddc7ef5 | 4214 | if (ret < 0) |
93d2bcd2 | 4215 | req_set_fail(req); |
e1e16097 | 4216 | io_req_complete(req, ret); |
eddc7ef5 JA |
4217 | return 0; |
4218 | } | |
4219 | ||
b5dba59e JA |
4220 | static int io_close_prep(struct io_kiocb *req, const struct io_uring_sqe *sqe) |
4221 | { | |
14587a46 | 4222 | if (unlikely(req->ctx->flags & IORING_SETUP_IOPOLL)) |
3232dd02 | 4223 | return -EINVAL; |
b5dba59e JA |
4224 | if (sqe->ioprio || sqe->off || sqe->addr || sqe->len || |
4225 | sqe->rw_flags || sqe->buf_index) | |
4226 | return -EINVAL; | |
9c280f90 | 4227 | if (req->flags & REQ_F_FIXED_FILE) |
cf3040ca | 4228 | return -EBADF; |
b5dba59e JA |
4229 | |
4230 | req->close.fd = READ_ONCE(sqe->fd); | |
b5dba59e | 4231 | return 0; |
b5dba59e JA |
4232 | } |
4233 | ||
889fca73 | 4234 | static int io_close(struct io_kiocb *req, unsigned int issue_flags) |
b5dba59e | 4235 | { |
9eac1904 | 4236 | struct files_struct *files = current->files; |
3af73b28 | 4237 | struct io_close *close = &req->close; |
9eac1904 | 4238 | struct fdtable *fdt; |
a1fde923 PB |
4239 | struct file *file = NULL; |
4240 | int ret = -EBADF; | |
b5dba59e | 4241 | |
9eac1904 JA |
4242 | spin_lock(&files->file_lock); |
4243 | fdt = files_fdtable(files); | |
4244 | if (close->fd >= fdt->max_fds) { | |
4245 | spin_unlock(&files->file_lock); | |
4246 | goto err; | |
4247 | } | |
4248 | file = fdt->fd[close->fd]; | |
a1fde923 | 4249 | if (!file || file->f_op == &io_uring_fops) { |
9eac1904 JA |
4250 | spin_unlock(&files->file_lock); |
4251 | file = NULL; | |
4252 | goto err; | |
3af73b28 | 4253 | } |
b5dba59e JA |
4254 | |
4255 | /* if the file has a flush method, be safe and punt to async */ | |
45d189c6 | 4256 | if (file->f_op->flush && (issue_flags & IO_URING_F_NONBLOCK)) { |
9eac1904 | 4257 | spin_unlock(&files->file_lock); |
0bf0eefd | 4258 | return -EAGAIN; |
a2100672 | 4259 | } |
b5dba59e | 4260 | |
9eac1904 JA |
4261 | ret = __close_fd_get_file(close->fd, &file); |
4262 | spin_unlock(&files->file_lock); | |
4263 | if (ret < 0) { | |
4264 | if (ret == -ENOENT) | |
4265 | ret = -EBADF; | |
4266 | goto err; | |
4267 | } | |
4268 | ||
3af73b28 | 4269 | /* No ->flush() or already async, safely close from here */ |
9eac1904 JA |
4270 | ret = filp_close(file, current->files); |
4271 | err: | |
3af73b28 | 4272 | if (ret < 0) |
93d2bcd2 | 4273 | req_set_fail(req); |
9eac1904 JA |
4274 | if (file) |
4275 | fput(file); | |
889fca73 | 4276 | __io_req_complete(req, issue_flags, ret, 0); |
1a417f4e | 4277 | return 0; |
b5dba59e JA |
4278 | } |
4279 | ||
1155c76a | 4280 | static int io_sfr_prep(struct io_kiocb *req, const struct io_uring_sqe *sqe) |
5d17b4a4 JA |
4281 | { |
4282 | struct io_ring_ctx *ctx = req->ctx; | |
5d17b4a4 | 4283 | |
5d17b4a4 JA |
4284 | if (unlikely(ctx->flags & IORING_SETUP_IOPOLL)) |
4285 | return -EINVAL; | |
4286 | if (unlikely(sqe->addr || sqe->ioprio || sqe->buf_index)) | |
4287 | return -EINVAL; | |
4288 | ||
8ed8d3c3 JA |
4289 | req->sync.off = READ_ONCE(sqe->off); |
4290 | req->sync.len = READ_ONCE(sqe->len); | |
4291 | req->sync.flags = READ_ONCE(sqe->sync_range_flags); | |
8ed8d3c3 JA |
4292 | return 0; |
4293 | } | |
4294 | ||
45d189c6 | 4295 | static int io_sync_file_range(struct io_kiocb *req, unsigned int issue_flags) |
8ed8d3c3 | 4296 | { |
8ed8d3c3 JA |
4297 | int ret; |
4298 | ||
ac45abc0 | 4299 | /* sync_file_range always requires a blocking context */ |
45d189c6 | 4300 | if (issue_flags & IO_URING_F_NONBLOCK) |
ac45abc0 PB |
4301 | return -EAGAIN; |
4302 | ||
9adbd45d | 4303 | ret = sync_file_range(req->file, req->sync.off, req->sync.len, |
8ed8d3c3 JA |
4304 | req->sync.flags); |
4305 | if (ret < 0) | |
93d2bcd2 | 4306 | req_set_fail(req); |
e1e16097 | 4307 | io_req_complete(req, ret); |
5d17b4a4 JA |
4308 | return 0; |
4309 | } | |
4310 | ||
469956e8 | 4311 | #if defined(CONFIG_NET) |
02d27d89 PB |
4312 | static int io_setup_async_msg(struct io_kiocb *req, |
4313 | struct io_async_msghdr *kmsg) | |
4314 | { | |
e8c2bc1f JA |
4315 | struct io_async_msghdr *async_msg = req->async_data; |
4316 | ||
4317 | if (async_msg) | |
02d27d89 | 4318 | return -EAGAIN; |
e8c2bc1f | 4319 | if (io_alloc_async_data(req)) { |
257e84a5 | 4320 | kfree(kmsg->free_iov); |
02d27d89 PB |
4321 | return -ENOMEM; |
4322 | } | |
e8c2bc1f | 4323 | async_msg = req->async_data; |
02d27d89 | 4324 | req->flags |= REQ_F_NEED_CLEANUP; |
e8c2bc1f | 4325 | memcpy(async_msg, kmsg, sizeof(*kmsg)); |
2a780802 | 4326 | async_msg->msg.msg_name = &async_msg->addr; |
257e84a5 PB |
4327 | /* if were using fast_iov, set it to the new one */ |
4328 | if (!async_msg->free_iov) | |
4329 | async_msg->msg.msg_iter.iov = async_msg->fast_iov; | |
4330 | ||
02d27d89 PB |
4331 | return -EAGAIN; |
4332 | } | |
4333 | ||
2ae523ed PB |
4334 | static int io_sendmsg_copy_hdr(struct io_kiocb *req, |
4335 | struct io_async_msghdr *iomsg) | |
4336 | { | |
2ae523ed | 4337 | iomsg->msg.msg_name = &iomsg->addr; |
257e84a5 | 4338 | iomsg->free_iov = iomsg->fast_iov; |
2ae523ed | 4339 | return sendmsg_copy_msghdr(&iomsg->msg, req->sr_msg.umsg, |
257e84a5 | 4340 | req->sr_msg.msg_flags, &iomsg->free_iov); |
2ae523ed PB |
4341 | } |
4342 | ||
93642ef8 PB |
4343 | static int io_sendmsg_prep_async(struct io_kiocb *req) |
4344 | { | |
4345 | int ret; | |
4346 | ||
93642ef8 PB |
4347 | ret = io_sendmsg_copy_hdr(req, req->async_data); |
4348 | if (!ret) | |
4349 | req->flags |= REQ_F_NEED_CLEANUP; | |
4350 | return ret; | |
4351 | } | |
4352 | ||
3529d8c2 | 4353 | static int io_sendmsg_prep(struct io_kiocb *req, const struct io_uring_sqe *sqe) |
03b1230c | 4354 | { |
e47293fd | 4355 | struct io_sr_msg *sr = &req->sr_msg; |
03b1230c | 4356 | |
d2b6f48b PB |
4357 | if (unlikely(req->ctx->flags & IORING_SETUP_IOPOLL)) |
4358 | return -EINVAL; | |
4359 | ||
270a5940 | 4360 | sr->umsg = u64_to_user_ptr(READ_ONCE(sqe->addr)); |
fddaface | 4361 | sr->len = READ_ONCE(sqe->len); |
04411806 PB |
4362 | sr->msg_flags = READ_ONCE(sqe->msg_flags) | MSG_NOSIGNAL; |
4363 | if (sr->msg_flags & MSG_DONTWAIT) | |
4364 | req->flags |= REQ_F_NOWAIT; | |
3529d8c2 | 4365 | |
d8768362 JA |
4366 | #ifdef CONFIG_COMPAT |
4367 | if (req->ctx->compat) | |
4368 | sr->msg_flags |= MSG_CMSG_COMPAT; | |
4369 | #endif | |
93642ef8 | 4370 | return 0; |
03b1230c JA |
4371 | } |
4372 | ||
889fca73 | 4373 | static int io_sendmsg(struct io_kiocb *req, unsigned int issue_flags) |
aa1fa28f | 4374 | { |
6b754c8b | 4375 | struct io_async_msghdr iomsg, *kmsg; |
0fa03c62 | 4376 | struct socket *sock; |
7a7cacba | 4377 | unsigned flags; |
0031275d | 4378 | int min_ret = 0; |
0fa03c62 JA |
4379 | int ret; |
4380 | ||
dba4a925 | 4381 | sock = sock_from_file(req->file); |
7a7cacba | 4382 | if (unlikely(!sock)) |
dba4a925 | 4383 | return -ENOTSOCK; |
3529d8c2 | 4384 | |
257e84a5 PB |
4385 | kmsg = req->async_data; |
4386 | if (!kmsg) { | |
7a7cacba PB |
4387 | ret = io_sendmsg_copy_hdr(req, &iomsg); |
4388 | if (ret) | |
4389 | return ret; | |
4390 | kmsg = &iomsg; | |
0fa03c62 | 4391 | } |
0fa03c62 | 4392 | |
04411806 PB |
4393 | flags = req->sr_msg.msg_flags; |
4394 | if (issue_flags & IO_URING_F_NONBLOCK) | |
7a7cacba | 4395 | flags |= MSG_DONTWAIT; |
0031275d SM |
4396 | if (flags & MSG_WAITALL) |
4397 | min_ret = iov_iter_count(&kmsg->msg.msg_iter); | |
4398 | ||
7a7cacba | 4399 | ret = __sys_sendmsg_sock(sock, &kmsg->msg, flags); |
45d189c6 | 4400 | if ((issue_flags & IO_URING_F_NONBLOCK) && ret == -EAGAIN) |
7a7cacba PB |
4401 | return io_setup_async_msg(req, kmsg); |
4402 | if (ret == -ERESTARTSYS) | |
4403 | ret = -EINTR; | |
0fa03c62 | 4404 | |
257e84a5 PB |
4405 | /* fast path, check for non-NULL to avoid function call */ |
4406 | if (kmsg->free_iov) | |
4407 | kfree(kmsg->free_iov); | |
99bc4c38 | 4408 | req->flags &= ~REQ_F_NEED_CLEANUP; |
0031275d | 4409 | if (ret < min_ret) |
93d2bcd2 | 4410 | req_set_fail(req); |
889fca73 | 4411 | __io_req_complete(req, issue_flags, ret, 0); |
5d17b4a4 | 4412 | return 0; |
03b1230c | 4413 | } |
aa1fa28f | 4414 | |
889fca73 | 4415 | static int io_send(struct io_kiocb *req, unsigned int issue_flags) |
fddaface | 4416 | { |
7a7cacba PB |
4417 | struct io_sr_msg *sr = &req->sr_msg; |
4418 | struct msghdr msg; | |
4419 | struct iovec iov; | |
fddaface | 4420 | struct socket *sock; |
7a7cacba | 4421 | unsigned flags; |
0031275d | 4422 | int min_ret = 0; |
fddaface JA |
4423 | int ret; |
4424 | ||
dba4a925 | 4425 | sock = sock_from_file(req->file); |
7a7cacba | 4426 | if (unlikely(!sock)) |
dba4a925 | 4427 | return -ENOTSOCK; |
fddaface | 4428 | |
7a7cacba PB |
4429 | ret = import_single_range(WRITE, sr->buf, sr->len, &iov, &msg.msg_iter); |
4430 | if (unlikely(ret)) | |
14db8411 | 4431 | return ret; |
fddaface | 4432 | |
7a7cacba PB |
4433 | msg.msg_name = NULL; |
4434 | msg.msg_control = NULL; | |
4435 | msg.msg_controllen = 0; | |
4436 | msg.msg_namelen = 0; | |
fddaface | 4437 | |
04411806 PB |
4438 | flags = req->sr_msg.msg_flags; |
4439 | if (issue_flags & IO_URING_F_NONBLOCK) | |
7a7cacba | 4440 | flags |= MSG_DONTWAIT; |
0031275d SM |
4441 | if (flags & MSG_WAITALL) |
4442 | min_ret = iov_iter_count(&msg.msg_iter); | |
4443 | ||
7a7cacba PB |
4444 | msg.msg_flags = flags; |
4445 | ret = sock_sendmsg(sock, &msg); | |
45d189c6 | 4446 | if ((issue_flags & IO_URING_F_NONBLOCK) && ret == -EAGAIN) |
7a7cacba PB |
4447 | return -EAGAIN; |
4448 | if (ret == -ERESTARTSYS) | |
4449 | ret = -EINTR; | |
fddaface | 4450 | |
0031275d | 4451 | if (ret < min_ret) |
93d2bcd2 | 4452 | req_set_fail(req); |
889fca73 | 4453 | __io_req_complete(req, issue_flags, ret, 0); |
fddaface | 4454 | return 0; |
fddaface JA |
4455 | } |
4456 | ||
1400e697 PB |
4457 | static int __io_recvmsg_copy_hdr(struct io_kiocb *req, |
4458 | struct io_async_msghdr *iomsg) | |
52de1fe1 JA |
4459 | { |
4460 | struct io_sr_msg *sr = &req->sr_msg; | |
4461 | struct iovec __user *uiov; | |
4462 | size_t iov_len; | |
4463 | int ret; | |
4464 | ||
1400e697 PB |
4465 | ret = __copy_msghdr_from_user(&iomsg->msg, sr->umsg, |
4466 | &iomsg->uaddr, &uiov, &iov_len); | |
52de1fe1 JA |
4467 | if (ret) |
4468 | return ret; | |
4469 | ||
4470 | if (req->flags & REQ_F_BUFFER_SELECT) { | |
4471 | if (iov_len > 1) | |
4472 | return -EINVAL; | |
5476dfed | 4473 | if (copy_from_user(iomsg->fast_iov, uiov, sizeof(*uiov))) |
52de1fe1 | 4474 | return -EFAULT; |
5476dfed | 4475 | sr->len = iomsg->fast_iov[0].iov_len; |
257e84a5 | 4476 | iomsg->free_iov = NULL; |
52de1fe1 | 4477 | } else { |
257e84a5 | 4478 | iomsg->free_iov = iomsg->fast_iov; |
89cd35c5 | 4479 | ret = __import_iovec(READ, uiov, iov_len, UIO_FASTIOV, |
257e84a5 | 4480 | &iomsg->free_iov, &iomsg->msg.msg_iter, |
89cd35c5 | 4481 | false); |
52de1fe1 JA |
4482 | if (ret > 0) |
4483 | ret = 0; | |
4484 | } | |
4485 | ||
4486 | return ret; | |
4487 | } | |
4488 | ||
4489 | #ifdef CONFIG_COMPAT | |
4490 | static int __io_compat_recvmsg_copy_hdr(struct io_kiocb *req, | |
1400e697 | 4491 | struct io_async_msghdr *iomsg) |
52de1fe1 | 4492 | { |
52de1fe1 JA |
4493 | struct io_sr_msg *sr = &req->sr_msg; |
4494 | struct compat_iovec __user *uiov; | |
4495 | compat_uptr_t ptr; | |
4496 | compat_size_t len; | |
4497 | int ret; | |
4498 | ||
4af3417a PB |
4499 | ret = __get_compat_msghdr(&iomsg->msg, sr->umsg_compat, &iomsg->uaddr, |
4500 | &ptr, &len); | |
52de1fe1 JA |
4501 | if (ret) |
4502 | return ret; | |
4503 | ||
4504 | uiov = compat_ptr(ptr); | |
4505 | if (req->flags & REQ_F_BUFFER_SELECT) { | |
4506 | compat_ssize_t clen; | |
4507 | ||
4508 | if (len > 1) | |
4509 | return -EINVAL; | |
4510 | if (!access_ok(uiov, sizeof(*uiov))) | |
4511 | return -EFAULT; | |
4512 | if (__get_user(clen, &uiov->iov_len)) | |
4513 | return -EFAULT; | |
4514 | if (clen < 0) | |
4515 | return -EINVAL; | |
2d280bc8 | 4516 | sr->len = clen; |
257e84a5 | 4517 | iomsg->free_iov = NULL; |
52de1fe1 | 4518 | } else { |
257e84a5 | 4519 | iomsg->free_iov = iomsg->fast_iov; |
89cd35c5 | 4520 | ret = __import_iovec(READ, (struct iovec __user *)uiov, len, |
257e84a5 | 4521 | UIO_FASTIOV, &iomsg->free_iov, |
89cd35c5 | 4522 | &iomsg->msg.msg_iter, true); |
52de1fe1 JA |
4523 | if (ret < 0) |
4524 | return ret; | |
4525 | } | |
4526 | ||
4527 | return 0; | |
4528 | } | |
4529 | #endif | |
4530 | ||
1400e697 PB |
4531 | static int io_recvmsg_copy_hdr(struct io_kiocb *req, |
4532 | struct io_async_msghdr *iomsg) | |
52de1fe1 | 4533 | { |
1400e697 | 4534 | iomsg->msg.msg_name = &iomsg->addr; |
52de1fe1 JA |
4535 | |
4536 | #ifdef CONFIG_COMPAT | |
4537 | if (req->ctx->compat) | |
1400e697 | 4538 | return __io_compat_recvmsg_copy_hdr(req, iomsg); |
fddaface | 4539 | #endif |
52de1fe1 | 4540 | |
1400e697 | 4541 | return __io_recvmsg_copy_hdr(req, iomsg); |
52de1fe1 JA |
4542 | } |
4543 | ||
bcda7baa | 4544 | static struct io_buffer *io_recv_buffer_select(struct io_kiocb *req, |
7fbb1b54 | 4545 | bool needs_lock) |
bcda7baa JA |
4546 | { |
4547 | struct io_sr_msg *sr = &req->sr_msg; | |
4548 | struct io_buffer *kbuf; | |
4549 | ||
bcda7baa JA |
4550 | kbuf = io_buffer_select(req, &sr->len, sr->bgid, sr->kbuf, needs_lock); |
4551 | if (IS_ERR(kbuf)) | |
4552 | return kbuf; | |
4553 | ||
4554 | sr->kbuf = kbuf; | |
4555 | req->flags |= REQ_F_BUFFER_SELECTED; | |
bcda7baa | 4556 | return kbuf; |
fddaface JA |
4557 | } |
4558 | ||
7fbb1b54 PB |
4559 | static inline unsigned int io_put_recv_kbuf(struct io_kiocb *req) |
4560 | { | |
4561 | return io_put_kbuf(req, req->sr_msg.kbuf); | |
4562 | } | |
4563 | ||
93642ef8 | 4564 | static int io_recvmsg_prep_async(struct io_kiocb *req) |
aa1fa28f | 4565 | { |
99bc4c38 | 4566 | int ret; |
3529d8c2 | 4567 | |
93642ef8 PB |
4568 | ret = io_recvmsg_copy_hdr(req, req->async_data); |
4569 | if (!ret) | |
4570 | req->flags |= REQ_F_NEED_CLEANUP; | |
4571 | return ret; | |
4572 | } | |
4573 | ||
4574 | static int io_recvmsg_prep(struct io_kiocb *req, const struct io_uring_sqe *sqe) | |
4575 | { | |
4576 | struct io_sr_msg *sr = &req->sr_msg; | |
4577 | ||
d2b6f48b PB |
4578 | if (unlikely(req->ctx->flags & IORING_SETUP_IOPOLL)) |
4579 | return -EINVAL; | |
4580 | ||
270a5940 | 4581 | sr->umsg = u64_to_user_ptr(READ_ONCE(sqe->addr)); |
0b7b21e4 | 4582 | sr->len = READ_ONCE(sqe->len); |
bcda7baa | 4583 | sr->bgid = READ_ONCE(sqe->buf_group); |
04411806 PB |
4584 | sr->msg_flags = READ_ONCE(sqe->msg_flags) | MSG_NOSIGNAL; |
4585 | if (sr->msg_flags & MSG_DONTWAIT) | |
4586 | req->flags |= REQ_F_NOWAIT; | |
06b76d44 | 4587 | |
d8768362 JA |
4588 | #ifdef CONFIG_COMPAT |
4589 | if (req->ctx->compat) | |
4590 | sr->msg_flags |= MSG_CMSG_COMPAT; | |
4591 | #endif | |
93642ef8 | 4592 | return 0; |
aa1fa28f JA |
4593 | } |
4594 | ||
889fca73 | 4595 | static int io_recvmsg(struct io_kiocb *req, unsigned int issue_flags) |
aa1fa28f | 4596 | { |
6b754c8b | 4597 | struct io_async_msghdr iomsg, *kmsg; |
03b1230c | 4598 | struct socket *sock; |
7fbb1b54 | 4599 | struct io_buffer *kbuf; |
7a7cacba | 4600 | unsigned flags; |
0031275d | 4601 | int min_ret = 0; |
52de1fe1 | 4602 | int ret, cflags = 0; |
45d189c6 | 4603 | bool force_nonblock = issue_flags & IO_URING_F_NONBLOCK; |
03b1230c | 4604 | |
dba4a925 | 4605 | sock = sock_from_file(req->file); |
7a7cacba | 4606 | if (unlikely(!sock)) |
dba4a925 | 4607 | return -ENOTSOCK; |
3529d8c2 | 4608 | |
257e84a5 PB |
4609 | kmsg = req->async_data; |
4610 | if (!kmsg) { | |
7a7cacba PB |
4611 | ret = io_recvmsg_copy_hdr(req, &iomsg); |
4612 | if (ret) | |
681fda8d | 4613 | return ret; |
7a7cacba PB |
4614 | kmsg = &iomsg; |
4615 | } | |
03b1230c | 4616 | |
bc02ef33 | 4617 | if (req->flags & REQ_F_BUFFER_SELECT) { |
7fbb1b54 | 4618 | kbuf = io_recv_buffer_select(req, !force_nonblock); |
bc02ef33 | 4619 | if (IS_ERR(kbuf)) |
52de1fe1 | 4620 | return PTR_ERR(kbuf); |
7a7cacba | 4621 | kmsg->fast_iov[0].iov_base = u64_to_user_ptr(kbuf->addr); |
5476dfed PB |
4622 | kmsg->fast_iov[0].iov_len = req->sr_msg.len; |
4623 | iov_iter_init(&kmsg->msg.msg_iter, READ, kmsg->fast_iov, | |
7a7cacba PB |
4624 | 1, req->sr_msg.len); |
4625 | } | |
52de1fe1 | 4626 | |
04411806 PB |
4627 | flags = req->sr_msg.msg_flags; |
4628 | if (force_nonblock) | |
7a7cacba | 4629 | flags |= MSG_DONTWAIT; |
0031275d SM |
4630 | if (flags & MSG_WAITALL) |
4631 | min_ret = iov_iter_count(&kmsg->msg.msg_iter); | |
4632 | ||
7a7cacba PB |
4633 | ret = __sys_recvmsg_sock(sock, &kmsg->msg, req->sr_msg.umsg, |
4634 | kmsg->uaddr, flags); | |
0e1b6fe3 PB |
4635 | if (force_nonblock && ret == -EAGAIN) |
4636 | return io_setup_async_msg(req, kmsg); | |
7a7cacba PB |
4637 | if (ret == -ERESTARTSYS) |
4638 | ret = -EINTR; | |
03b1230c | 4639 | |
7fbb1b54 PB |
4640 | if (req->flags & REQ_F_BUFFER_SELECTED) |
4641 | cflags = io_put_recv_kbuf(req); | |
257e84a5 PB |
4642 | /* fast path, check for non-NULL to avoid function call */ |
4643 | if (kmsg->free_iov) | |
4644 | kfree(kmsg->free_iov); | |
99bc4c38 | 4645 | req->flags &= ~REQ_F_NEED_CLEANUP; |
0031275d | 4646 | if (ret < min_ret || ((flags & MSG_WAITALL) && (kmsg->msg.msg_flags & (MSG_TRUNC | MSG_CTRUNC)))) |
93d2bcd2 | 4647 | req_set_fail(req); |
889fca73 | 4648 | __io_req_complete(req, issue_flags, ret, cflags); |
03b1230c | 4649 | return 0; |
0fa03c62 | 4650 | } |
5d17b4a4 | 4651 | |
889fca73 | 4652 | static int io_recv(struct io_kiocb *req, unsigned int issue_flags) |
fddaface | 4653 | { |
6b754c8b | 4654 | struct io_buffer *kbuf; |
7a7cacba PB |
4655 | struct io_sr_msg *sr = &req->sr_msg; |
4656 | struct msghdr msg; | |
4657 | void __user *buf = sr->buf; | |
fddaface | 4658 | struct socket *sock; |
7a7cacba PB |
4659 | struct iovec iov; |
4660 | unsigned flags; | |
0031275d | 4661 | int min_ret = 0; |
bcda7baa | 4662 | int ret, cflags = 0; |
45d189c6 | 4663 | bool force_nonblock = issue_flags & IO_URING_F_NONBLOCK; |
fddaface | 4664 | |
dba4a925 | 4665 | sock = sock_from_file(req->file); |
7a7cacba | 4666 | if (unlikely(!sock)) |
dba4a925 | 4667 | return -ENOTSOCK; |
fddaface | 4668 | |
bc02ef33 | 4669 | if (req->flags & REQ_F_BUFFER_SELECT) { |
7fbb1b54 | 4670 | kbuf = io_recv_buffer_select(req, !force_nonblock); |
bcda7baa JA |
4671 | if (IS_ERR(kbuf)) |
4672 | return PTR_ERR(kbuf); | |
7a7cacba | 4673 | buf = u64_to_user_ptr(kbuf->addr); |
bc02ef33 | 4674 | } |
bcda7baa | 4675 | |
7a7cacba | 4676 | ret = import_single_range(READ, buf, sr->len, &iov, &msg.msg_iter); |
14c32eee PB |
4677 | if (unlikely(ret)) |
4678 | goto out_free; | |
fddaface | 4679 | |
7a7cacba PB |
4680 | msg.msg_name = NULL; |
4681 | msg.msg_control = NULL; | |
4682 | msg.msg_controllen = 0; | |
4683 | msg.msg_namelen = 0; | |
4684 | msg.msg_iocb = NULL; | |
4685 | msg.msg_flags = 0; | |
fddaface | 4686 | |
04411806 PB |
4687 | flags = req->sr_msg.msg_flags; |
4688 | if (force_nonblock) | |
7a7cacba | 4689 | flags |= MSG_DONTWAIT; |
0031275d SM |
4690 | if (flags & MSG_WAITALL) |
4691 | min_ret = iov_iter_count(&msg.msg_iter); | |
4692 | ||
7a7cacba PB |
4693 | ret = sock_recvmsg(sock, &msg, flags); |
4694 | if (force_nonblock && ret == -EAGAIN) | |
4695 | return -EAGAIN; | |
4696 | if (ret == -ERESTARTSYS) | |
4697 | ret = -EINTR; | |
14c32eee | 4698 | out_free: |
7fbb1b54 PB |
4699 | if (req->flags & REQ_F_BUFFER_SELECTED) |
4700 | cflags = io_put_recv_kbuf(req); | |
0031275d | 4701 | if (ret < min_ret || ((flags & MSG_WAITALL) && (msg.msg_flags & (MSG_TRUNC | MSG_CTRUNC)))) |
93d2bcd2 | 4702 | req_set_fail(req); |
889fca73 | 4703 | __io_req_complete(req, issue_flags, ret, cflags); |
fddaface | 4704 | return 0; |
fddaface JA |
4705 | } |
4706 | ||
3529d8c2 | 4707 | static int io_accept_prep(struct io_kiocb *req, const struct io_uring_sqe *sqe) |
17f2fe35 | 4708 | { |
8ed8d3c3 JA |
4709 | struct io_accept *accept = &req->accept; |
4710 | ||
14587a46 | 4711 | if (unlikely(req->ctx->flags & IORING_SETUP_IOPOLL)) |
17f2fe35 | 4712 | return -EINVAL; |
8042d6ce | 4713 | if (sqe->ioprio || sqe->len || sqe->buf_index) |
17f2fe35 JA |
4714 | return -EINVAL; |
4715 | ||
d55e5f5b JA |
4716 | accept->addr = u64_to_user_ptr(READ_ONCE(sqe->addr)); |
4717 | accept->addr_len = u64_to_user_ptr(READ_ONCE(sqe->addr2)); | |
8ed8d3c3 | 4718 | accept->flags = READ_ONCE(sqe->accept_flags); |
09952e3e | 4719 | accept->nofile = rlimit(RLIMIT_NOFILE); |
8ed8d3c3 | 4720 | return 0; |
8ed8d3c3 | 4721 | } |
17f2fe35 | 4722 | |
889fca73 | 4723 | static int io_accept(struct io_kiocb *req, unsigned int issue_flags) |
8ed8d3c3 JA |
4724 | { |
4725 | struct io_accept *accept = &req->accept; | |
45d189c6 | 4726 | bool force_nonblock = issue_flags & IO_URING_F_NONBLOCK; |
ac45abc0 | 4727 | unsigned int file_flags = force_nonblock ? O_NONBLOCK : 0; |
8ed8d3c3 JA |
4728 | int ret; |
4729 | ||
e697deed JX |
4730 | if (req->file->f_flags & O_NONBLOCK) |
4731 | req->flags |= REQ_F_NOWAIT; | |
4732 | ||
8ed8d3c3 | 4733 | ret = __sys_accept4_file(req->file, file_flags, accept->addr, |
09952e3e JA |
4734 | accept->addr_len, accept->flags, |
4735 | accept->nofile); | |
8ed8d3c3 | 4736 | if (ret == -EAGAIN && force_nonblock) |
17f2fe35 | 4737 | return -EAGAIN; |
ac45abc0 PB |
4738 | if (ret < 0) { |
4739 | if (ret == -ERESTARTSYS) | |
4740 | ret = -EINTR; | |
93d2bcd2 | 4741 | req_set_fail(req); |
ac45abc0 | 4742 | } |
889fca73 | 4743 | __io_req_complete(req, issue_flags, ret, 0); |
17f2fe35 | 4744 | return 0; |
8ed8d3c3 JA |
4745 | } |
4746 | ||
93642ef8 PB |
4747 | static int io_connect_prep_async(struct io_kiocb *req) |
4748 | { | |
4749 | struct io_async_connect *io = req->async_data; | |
4750 | struct io_connect *conn = &req->connect; | |
4751 | ||
4752 | return move_addr_to_kernel(conn->addr, conn->addr_len, &io->address); | |
4753 | } | |
4754 | ||
3529d8c2 | 4755 | static int io_connect_prep(struct io_kiocb *req, const struct io_uring_sqe *sqe) |
f499a021 | 4756 | { |
3529d8c2 | 4757 | struct io_connect *conn = &req->connect; |
f499a021 | 4758 | |
14587a46 | 4759 | if (unlikely(req->ctx->flags & IORING_SETUP_IOPOLL)) |
3fbb51c1 JA |
4760 | return -EINVAL; |
4761 | if (sqe->ioprio || sqe->len || sqe->buf_index || sqe->rw_flags) | |
4762 | return -EINVAL; | |
4763 | ||
3529d8c2 JA |
4764 | conn->addr = u64_to_user_ptr(READ_ONCE(sqe->addr)); |
4765 | conn->addr_len = READ_ONCE(sqe->addr2); | |
93642ef8 | 4766 | return 0; |
f499a021 JA |
4767 | } |
4768 | ||
889fca73 | 4769 | static int io_connect(struct io_kiocb *req, unsigned int issue_flags) |
f8e85cf2 | 4770 | { |
e8c2bc1f | 4771 | struct io_async_connect __io, *io; |
f8e85cf2 | 4772 | unsigned file_flags; |
3fbb51c1 | 4773 | int ret; |
45d189c6 | 4774 | bool force_nonblock = issue_flags & IO_URING_F_NONBLOCK; |
f8e85cf2 | 4775 | |
e8c2bc1f JA |
4776 | if (req->async_data) { |
4777 | io = req->async_data; | |
f499a021 | 4778 | } else { |
3529d8c2 JA |
4779 | ret = move_addr_to_kernel(req->connect.addr, |
4780 | req->connect.addr_len, | |
e8c2bc1f | 4781 | &__io.address); |
f499a021 JA |
4782 | if (ret) |
4783 | goto out; | |
4784 | io = &__io; | |
4785 | } | |
4786 | ||
3fbb51c1 JA |
4787 | file_flags = force_nonblock ? O_NONBLOCK : 0; |
4788 | ||
e8c2bc1f | 4789 | ret = __sys_connect_file(req->file, &io->address, |
3fbb51c1 | 4790 | req->connect.addr_len, file_flags); |
87f80d62 | 4791 | if ((ret == -EAGAIN || ret == -EINPROGRESS) && force_nonblock) { |
e8c2bc1f | 4792 | if (req->async_data) |
b7bb4f7d | 4793 | return -EAGAIN; |
e8c2bc1f | 4794 | if (io_alloc_async_data(req)) { |
f499a021 JA |
4795 | ret = -ENOMEM; |
4796 | goto out; | |
4797 | } | |
e8c2bc1f | 4798 | memcpy(req->async_data, &__io, sizeof(__io)); |
f8e85cf2 | 4799 | return -EAGAIN; |
f499a021 | 4800 | } |
f8e85cf2 JA |
4801 | if (ret == -ERESTARTSYS) |
4802 | ret = -EINTR; | |
f499a021 | 4803 | out: |
4e88d6e7 | 4804 | if (ret < 0) |
93d2bcd2 | 4805 | req_set_fail(req); |
889fca73 | 4806 | __io_req_complete(req, issue_flags, ret, 0); |
f8e85cf2 | 4807 | return 0; |
469956e8 Y |
4808 | } |
4809 | #else /* !CONFIG_NET */ | |
99a10081 JA |
4810 | #define IO_NETOP_FN(op) \ |
4811 | static int io_##op(struct io_kiocb *req, unsigned int issue_flags) \ | |
4812 | { \ | |
4813 | return -EOPNOTSUPP; \ | |
4814 | } | |
4815 | ||
4816 | #define IO_NETOP_PREP(op) \ | |
4817 | IO_NETOP_FN(op) \ | |
4818 | static int io_##op##_prep(struct io_kiocb *req, const struct io_uring_sqe *sqe) \ | |
4819 | { \ | |
4820 | return -EOPNOTSUPP; \ | |
4821 | } \ | |
4822 | ||
4823 | #define IO_NETOP_PREP_ASYNC(op) \ | |
4824 | IO_NETOP_PREP(op) \ | |
4825 | static int io_##op##_prep_async(struct io_kiocb *req) \ | |
4826 | { \ | |
4827 | return -EOPNOTSUPP; \ | |
4828 | } | |
4829 | ||
4830 | IO_NETOP_PREP_ASYNC(sendmsg); | |
4831 | IO_NETOP_PREP_ASYNC(recvmsg); | |
4832 | IO_NETOP_PREP_ASYNC(connect); | |
4833 | IO_NETOP_PREP(accept); | |
4834 | IO_NETOP_FN(send); | |
4835 | IO_NETOP_FN(recv); | |
469956e8 | 4836 | #endif /* CONFIG_NET */ |
f8e85cf2 | 4837 | |
d7718a9d JA |
4838 | struct io_poll_table { |
4839 | struct poll_table_struct pt; | |
4840 | struct io_kiocb *req; | |
68b11e8b | 4841 | int nr_entries; |
d7718a9d JA |
4842 | int error; |
4843 | }; | |
ce593a6c | 4844 | |
d7718a9d | 4845 | static int __io_async_wake(struct io_kiocb *req, struct io_poll_iocb *poll, |
5b0a6acc | 4846 | __poll_t mask, io_req_tw_func_t func) |
d7718a9d | 4847 | { |
d7718a9d JA |
4848 | /* for instances that support it check for an event match first: */ |
4849 | if (mask && !(mask & poll->events)) | |
4850 | return 0; | |
4851 | ||
4852 | trace_io_uring_task_add(req->ctx, req->opcode, req->user_data, mask); | |
4853 | ||
4854 | list_del_init(&poll->wait.entry); | |
4855 | ||
d7718a9d | 4856 | req->result = mask; |
5b0a6acc | 4857 | req->io_task_work.func = func; |
6d816e08 | 4858 | |
d7718a9d | 4859 | /* |
e3aabf95 JA |
4860 | * If this fails, then the task is exiting. When a task exits, the |
4861 | * work gets canceled, so just cancel this request as well instead | |
4862 | * of executing it. We can't safely execute it anyway, as we may not | |
4863 | * have the needed state needed for it anyway. | |
d7718a9d | 4864 | */ |
e09ee510 | 4865 | io_req_task_work_add(req); |
d7718a9d JA |
4866 | return 1; |
4867 | } | |
4868 | ||
74ce6ce4 JA |
4869 | static bool io_poll_rewait(struct io_kiocb *req, struct io_poll_iocb *poll) |
4870 | __acquires(&req->ctx->completion_lock) | |
4871 | { | |
4872 | struct io_ring_ctx *ctx = req->ctx; | |
4873 | ||
e09ee510 PB |
4874 | if (unlikely(req->task->flags & PF_EXITING)) |
4875 | WRITE_ONCE(poll->canceled, true); | |
4876 | ||
74ce6ce4 JA |
4877 | if (!req->result && !READ_ONCE(poll->canceled)) { |
4878 | struct poll_table_struct pt = { ._key = poll->events }; | |
4879 | ||
4880 | req->result = vfs_poll(req->file, &pt) & poll->events; | |
4881 | } | |
4882 | ||
4883 | spin_lock_irq(&ctx->completion_lock); | |
4884 | if (!req->result && !READ_ONCE(poll->canceled)) { | |
4885 | add_wait_queue(poll->head, &poll->wait); | |
4886 | return true; | |
4887 | } | |
4888 | ||
4889 | return false; | |
4890 | } | |
4891 | ||
d4e7cd36 | 4892 | static struct io_poll_iocb *io_poll_get_double(struct io_kiocb *req) |
18bceab1 | 4893 | { |
e8c2bc1f | 4894 | /* pure poll stashes this in ->async_data, poll driven retry elsewhere */ |
d4e7cd36 | 4895 | if (req->opcode == IORING_OP_POLL_ADD) |
e8c2bc1f | 4896 | return req->async_data; |
d4e7cd36 JA |
4897 | return req->apoll->double_poll; |
4898 | } | |
4899 | ||
4900 | static struct io_poll_iocb *io_poll_get_single(struct io_kiocb *req) | |
4901 | { | |
4902 | if (req->opcode == IORING_OP_POLL_ADD) | |
4903 | return &req->poll; | |
4904 | return &req->apoll->poll; | |
4905 | } | |
4906 | ||
4907 | static void io_poll_remove_double(struct io_kiocb *req) | |
e07785b0 | 4908 | __must_hold(&req->ctx->completion_lock) |
d4e7cd36 JA |
4909 | { |
4910 | struct io_poll_iocb *poll = io_poll_get_double(req); | |
18bceab1 JA |
4911 | |
4912 | lockdep_assert_held(&req->ctx->completion_lock); | |
4913 | ||
4914 | if (poll && poll->head) { | |
4915 | struct wait_queue_head *head = poll->head; | |
4916 | ||
4917 | spin_lock(&head->lock); | |
4918 | list_del_init(&poll->wait.entry); | |
4919 | if (poll->wait.private) | |
de9b4cca | 4920 | req_ref_put(req); |
18bceab1 JA |
4921 | poll->head = NULL; |
4922 | spin_unlock(&head->lock); | |
4923 | } | |
4924 | } | |
4925 | ||
e27414be | 4926 | static bool io_poll_complete(struct io_kiocb *req, __poll_t mask) |
e07785b0 | 4927 | __must_hold(&req->ctx->completion_lock) |
18bceab1 JA |
4928 | { |
4929 | struct io_ring_ctx *ctx = req->ctx; | |
88e41cf9 | 4930 | unsigned flags = IORING_CQE_F_MORE; |
e27414be | 4931 | int error; |
18bceab1 | 4932 | |
e27414be | 4933 | if (READ_ONCE(req->poll.canceled)) { |
45ab03b1 | 4934 | error = -ECANCELED; |
88e41cf9 | 4935 | req->poll.events |= EPOLLONESHOT; |
e27414be | 4936 | } else { |
5082620f | 4937 | error = mangle_poll(mask); |
e27414be | 4938 | } |
b69de288 JA |
4939 | if (req->poll.events & EPOLLONESHOT) |
4940 | flags = 0; | |
d4d19c19 | 4941 | if (!io_cqring_fill_event(ctx, req->user_data, error, flags)) { |
88e41cf9 JA |
4942 | req->poll.done = true; |
4943 | flags = 0; | |
4944 | } | |
7b289c38 HX |
4945 | if (flags & IORING_CQE_F_MORE) |
4946 | ctx->cq_extra++; | |
18bceab1 | 4947 | |
18bceab1 | 4948 | io_commit_cqring(ctx); |
88e41cf9 | 4949 | return !(flags & IORING_CQE_F_MORE); |
18bceab1 JA |
4950 | } |
4951 | ||
5b0a6acc | 4952 | static void io_poll_task_func(struct io_kiocb *req) |
18bceab1 JA |
4953 | { |
4954 | struct io_ring_ctx *ctx = req->ctx; | |
dd221f46 | 4955 | struct io_kiocb *nxt; |
18bceab1 JA |
4956 | |
4957 | if (io_poll_rewait(req, &req->poll)) { | |
4958 | spin_unlock_irq(&ctx->completion_lock); | |
dd221f46 | 4959 | } else { |
f40b964a | 4960 | bool done; |
18bceab1 | 4961 | |
e27414be | 4962 | done = io_poll_complete(req, req->result); |
88e41cf9 | 4963 | if (done) { |
a890d01e | 4964 | io_poll_remove_double(req); |
88e41cf9 | 4965 | hash_del(&req->hash_node); |
f40b964a | 4966 | } else { |
88e41cf9 JA |
4967 | req->result = 0; |
4968 | add_wait_queue(req->poll.head, &req->poll.wait); | |
4969 | } | |
dd221f46 | 4970 | spin_unlock_irq(&ctx->completion_lock); |
dd221f46 | 4971 | io_cqring_ev_posted(ctx); |
18bceab1 | 4972 | |
88e41cf9 JA |
4973 | if (done) { |
4974 | nxt = io_put_req_find_next(req); | |
4975 | if (nxt) | |
5b0a6acc | 4976 | io_req_task_submit(nxt); |
88e41cf9 | 4977 | } |
dd221f46 | 4978 | } |
18bceab1 JA |
4979 | } |
4980 | ||
4981 | static int io_poll_double_wake(struct wait_queue_entry *wait, unsigned mode, | |
4982 | int sync, void *key) | |
4983 | { | |
4984 | struct io_kiocb *req = wait->private; | |
d4e7cd36 | 4985 | struct io_poll_iocb *poll = io_poll_get_single(req); |
18bceab1 JA |
4986 | __poll_t mask = key_to_poll(key); |
4987 | ||
4988 | /* for instances that support it check for an event match first: */ | |
4989 | if (mask && !(mask & poll->events)) | |
4990 | return 0; | |
88e41cf9 JA |
4991 | if (!(poll->events & EPOLLONESHOT)) |
4992 | return poll->wait.func(&poll->wait, mode, sync, key); | |
18bceab1 | 4993 | |
8706e04e JA |
4994 | list_del_init(&wait->entry); |
4995 | ||
9ce85ef2 | 4996 | if (poll->head) { |
18bceab1 JA |
4997 | bool done; |
4998 | ||
807abcb0 JA |
4999 | spin_lock(&poll->head->lock); |
5000 | done = list_empty(&poll->wait.entry); | |
18bceab1 | 5001 | if (!done) |
807abcb0 | 5002 | list_del_init(&poll->wait.entry); |
d4e7cd36 JA |
5003 | /* make sure double remove sees this as being gone */ |
5004 | wait->private = NULL; | |
807abcb0 | 5005 | spin_unlock(&poll->head->lock); |
c8b5e260 JA |
5006 | if (!done) { |
5007 | /* use wait func handler, so it matches the rq type */ | |
5008 | poll->wait.func(&poll->wait, mode, sync, key); | |
5009 | } | |
18bceab1 | 5010 | } |
de9b4cca | 5011 | req_ref_put(req); |
18bceab1 JA |
5012 | return 1; |
5013 | } | |
5014 | ||
5015 | static void io_init_poll_iocb(struct io_poll_iocb *poll, __poll_t events, | |
5016 | wait_queue_func_t wake_func) | |
5017 | { | |
5018 | poll->head = NULL; | |
5019 | poll->done = false; | |
5020 | poll->canceled = false; | |
464dca61 JA |
5021 | #define IO_POLL_UNMASK (EPOLLERR|EPOLLHUP|EPOLLNVAL|EPOLLRDHUP) |
5022 | /* mask in events that we always want/need */ | |
5023 | poll->events = events | IO_POLL_UNMASK; | |
18bceab1 JA |
5024 | INIT_LIST_HEAD(&poll->wait.entry); |
5025 | init_waitqueue_func_entry(&poll->wait, wake_func); | |
5026 | } | |
5027 | ||
5028 | static void __io_queue_proc(struct io_poll_iocb *poll, struct io_poll_table *pt, | |
807abcb0 JA |
5029 | struct wait_queue_head *head, |
5030 | struct io_poll_iocb **poll_ptr) | |
18bceab1 JA |
5031 | { |
5032 | struct io_kiocb *req = pt->req; | |
5033 | ||
5034 | /* | |
68b11e8b PB |
5035 | * The file being polled uses multiple waitqueues for poll handling |
5036 | * (e.g. one for read, one for write). Setup a separate io_poll_iocb | |
5037 | * if this happens. | |
18bceab1 | 5038 | */ |
68b11e8b | 5039 | if (unlikely(pt->nr_entries)) { |
58852d4d PB |
5040 | struct io_poll_iocb *poll_one = poll; |
5041 | ||
18bceab1 | 5042 | /* already have a 2nd entry, fail a third attempt */ |
807abcb0 | 5043 | if (*poll_ptr) { |
18bceab1 JA |
5044 | pt->error = -EINVAL; |
5045 | return; | |
5046 | } | |
ea6a693d JA |
5047 | /* |
5048 | * Can't handle multishot for double wait for now, turn it | |
5049 | * into one-shot mode. | |
5050 | */ | |
7a274727 PB |
5051 | if (!(poll_one->events & EPOLLONESHOT)) |
5052 | poll_one->events |= EPOLLONESHOT; | |
1c3b3e65 | 5053 | /* double add on the same waitqueue head, ignore */ |
7a274727 | 5054 | if (poll_one->head == head) |
1c3b3e65 | 5055 | return; |
18bceab1 JA |
5056 | poll = kmalloc(sizeof(*poll), GFP_ATOMIC); |
5057 | if (!poll) { | |
5058 | pt->error = -ENOMEM; | |
5059 | return; | |
5060 | } | |
58852d4d | 5061 | io_init_poll_iocb(poll, poll_one->events, io_poll_double_wake); |
de9b4cca | 5062 | req_ref_get(req); |
18bceab1 | 5063 | poll->wait.private = req; |
807abcb0 | 5064 | *poll_ptr = poll; |
18bceab1 JA |
5065 | } |
5066 | ||
68b11e8b | 5067 | pt->nr_entries++; |
18bceab1 | 5068 | poll->head = head; |
a31eb4a2 JX |
5069 | |
5070 | if (poll->events & EPOLLEXCLUSIVE) | |
5071 | add_wait_queue_exclusive(head, &poll->wait); | |
5072 | else | |
5073 | add_wait_queue(head, &poll->wait); | |
18bceab1 JA |
5074 | } |
5075 | ||
5076 | static void io_async_queue_proc(struct file *file, struct wait_queue_head *head, | |
5077 | struct poll_table_struct *p) | |
5078 | { | |
5079 | struct io_poll_table *pt = container_of(p, struct io_poll_table, pt); | |
807abcb0 | 5080 | struct async_poll *apoll = pt->req->apoll; |
18bceab1 | 5081 | |
807abcb0 | 5082 | __io_queue_proc(&apoll->poll, pt, head, &apoll->double_poll); |
18bceab1 JA |
5083 | } |
5084 | ||
5b0a6acc | 5085 | static void io_async_task_func(struct io_kiocb *req) |
d7718a9d | 5086 | { |
d7718a9d JA |
5087 | struct async_poll *apoll = req->apoll; |
5088 | struct io_ring_ctx *ctx = req->ctx; | |
5089 | ||
236daeae | 5090 | trace_io_uring_task_run(req->ctx, req, req->opcode, req->user_data); |
d7718a9d | 5091 | |
74ce6ce4 | 5092 | if (io_poll_rewait(req, &apoll->poll)) { |
d7718a9d | 5093 | spin_unlock_irq(&ctx->completion_lock); |
74ce6ce4 | 5094 | return; |
d7718a9d JA |
5095 | } |
5096 | ||
0ea13b44 | 5097 | hash_del(&req->hash_node); |
d4e7cd36 | 5098 | io_poll_remove_double(req); |
74ce6ce4 JA |
5099 | spin_unlock_irq(&ctx->completion_lock); |
5100 | ||
0be0b0e3 | 5101 | if (!READ_ONCE(apoll->poll.canceled)) |
5b0a6acc | 5102 | io_req_task_submit(req); |
0be0b0e3 | 5103 | else |
2593553a | 5104 | io_req_complete_failed(req, -ECANCELED); |
d7718a9d JA |
5105 | } |
5106 | ||
5107 | static int io_async_wake(struct wait_queue_entry *wait, unsigned mode, int sync, | |
5108 | void *key) | |
5109 | { | |
5110 | struct io_kiocb *req = wait->private; | |
5111 | struct io_poll_iocb *poll = &req->apoll->poll; | |
5112 | ||
5113 | trace_io_uring_poll_wake(req->ctx, req->opcode, req->user_data, | |
5114 | key_to_poll(key)); | |
5115 | ||
5116 | return __io_async_wake(req, poll, key_to_poll(key), io_async_task_func); | |
5117 | } | |
5118 | ||
5119 | static void io_poll_req_insert(struct io_kiocb *req) | |
5120 | { | |
5121 | struct io_ring_ctx *ctx = req->ctx; | |
5122 | struct hlist_head *list; | |
5123 | ||
5124 | list = &ctx->cancel_hash[hash_long(req->user_data, ctx->cancel_hash_bits)]; | |
5125 | hlist_add_head(&req->hash_node, list); | |
5126 | } | |
5127 | ||
5128 | static __poll_t __io_arm_poll_handler(struct io_kiocb *req, | |
5129 | struct io_poll_iocb *poll, | |
5130 | struct io_poll_table *ipt, __poll_t mask, | |
5131 | wait_queue_func_t wake_func) | |
5132 | __acquires(&ctx->completion_lock) | |
5133 | { | |
5134 | struct io_ring_ctx *ctx = req->ctx; | |
5135 | bool cancel = false; | |
5136 | ||
4d52f338 | 5137 | INIT_HLIST_NODE(&req->hash_node); |
18bceab1 | 5138 | io_init_poll_iocb(poll, mask, wake_func); |
b90cd197 | 5139 | poll->file = req->file; |
18bceab1 | 5140 | poll->wait.private = req; |
d7718a9d JA |
5141 | |
5142 | ipt->pt._key = mask; | |
5143 | ipt->req = req; | |
68b11e8b PB |
5144 | ipt->error = 0; |
5145 | ipt->nr_entries = 0; | |
d7718a9d | 5146 | |
d7718a9d | 5147 | mask = vfs_poll(req->file, &ipt->pt) & poll->events; |
68b11e8b PB |
5148 | if (unlikely(!ipt->nr_entries) && !ipt->error) |
5149 | ipt->error = -EINVAL; | |
d7718a9d JA |
5150 | |
5151 | spin_lock_irq(&ctx->completion_lock); | |
a890d01e | 5152 | if (ipt->error || (mask && (poll->events & EPOLLONESHOT))) |
46fee9ab | 5153 | io_poll_remove_double(req); |
d7718a9d JA |
5154 | if (likely(poll->head)) { |
5155 | spin_lock(&poll->head->lock); | |
5156 | if (unlikely(list_empty(&poll->wait.entry))) { | |
5157 | if (ipt->error) | |
5158 | cancel = true; | |
5159 | ipt->error = 0; | |
5160 | mask = 0; | |
5161 | } | |
88e41cf9 | 5162 | if ((mask && (poll->events & EPOLLONESHOT)) || ipt->error) |
d7718a9d JA |
5163 | list_del_init(&poll->wait.entry); |
5164 | else if (cancel) | |
5165 | WRITE_ONCE(poll->canceled, true); | |
5166 | else if (!poll->done) /* actually waiting for an event */ | |
5167 | io_poll_req_insert(req); | |
5168 | spin_unlock(&poll->head->lock); | |
5169 | } | |
5170 | ||
5171 | return mask; | |
5172 | } | |
5173 | ||
59b735ae OL |
5174 | enum { |
5175 | IO_APOLL_OK, | |
5176 | IO_APOLL_ABORTED, | |
5177 | IO_APOLL_READY | |
5178 | }; | |
5179 | ||
5180 | static int io_arm_poll_handler(struct io_kiocb *req) | |
d7718a9d JA |
5181 | { |
5182 | const struct io_op_def *def = &io_op_defs[req->opcode]; | |
5183 | struct io_ring_ctx *ctx = req->ctx; | |
5184 | struct async_poll *apoll; | |
5185 | struct io_poll_table ipt; | |
b2d9c3da | 5186 | __poll_t ret, mask = EPOLLONESHOT | POLLERR | POLLPRI; |
9dab14b8 | 5187 | int rw; |
d7718a9d JA |
5188 | |
5189 | if (!req->file || !file_can_poll(req->file)) | |
59b735ae | 5190 | return IO_APOLL_ABORTED; |
24c74678 | 5191 | if (req->flags & REQ_F_POLLED) |
59b735ae | 5192 | return IO_APOLL_ABORTED; |
b2d9c3da PB |
5193 | if (!def->pollin && !def->pollout) |
5194 | return IO_APOLL_ABORTED; | |
5195 | ||
5196 | if (def->pollin) { | |
9dab14b8 | 5197 | rw = READ; |
b2d9c3da PB |
5198 | mask |= POLLIN | POLLRDNORM; |
5199 | ||
5200 | /* If reading from MSG_ERRQUEUE using recvmsg, ignore POLLIN */ | |
5201 | if ((req->opcode == IORING_OP_RECVMSG) && | |
5202 | (req->sr_msg.msg_flags & MSG_ERRQUEUE)) | |
5203 | mask &= ~POLLIN; | |
5204 | } else { | |
9dab14b8 | 5205 | rw = WRITE; |
b2d9c3da PB |
5206 | mask |= POLLOUT | POLLWRNORM; |
5207 | } | |
5208 | ||
9dab14b8 | 5209 | /* if we can't nonblock try, then no point in arming a poll handler */ |
b191e2df | 5210 | if (!io_file_supports_nowait(req, rw)) |
59b735ae | 5211 | return IO_APOLL_ABORTED; |
d7718a9d JA |
5212 | |
5213 | apoll = kmalloc(sizeof(*apoll), GFP_ATOMIC); | |
5214 | if (unlikely(!apoll)) | |
59b735ae | 5215 | return IO_APOLL_ABORTED; |
807abcb0 | 5216 | apoll->double_poll = NULL; |
d7718a9d | 5217 | req->apoll = apoll; |
b2d9c3da | 5218 | req->flags |= REQ_F_POLLED; |
d7718a9d JA |
5219 | ipt.pt._qproc = io_async_queue_proc; |
5220 | ||
5221 | ret = __io_arm_poll_handler(req, &apoll->poll, &ipt, mask, | |
5222 | io_async_wake); | |
a36da65c | 5223 | if (ret || ipt.error) { |
d7718a9d | 5224 | spin_unlock_irq(&ctx->completion_lock); |
59b735ae OL |
5225 | if (ret) |
5226 | return IO_APOLL_READY; | |
5227 | return IO_APOLL_ABORTED; | |
d7718a9d JA |
5228 | } |
5229 | spin_unlock_irq(&ctx->completion_lock); | |
236daeae OL |
5230 | trace_io_uring_poll_arm(ctx, req, req->opcode, req->user_data, |
5231 | mask, apoll->poll.events); | |
59b735ae | 5232 | return IO_APOLL_OK; |
d7718a9d JA |
5233 | } |
5234 | ||
5235 | static bool __io_poll_remove_one(struct io_kiocb *req, | |
b2e720ac | 5236 | struct io_poll_iocb *poll, bool do_cancel) |
e07785b0 | 5237 | __must_hold(&req->ctx->completion_lock) |
221c5eb2 | 5238 | { |
b41e9852 | 5239 | bool do_complete = false; |
221c5eb2 | 5240 | |
5082620f JA |
5241 | if (!poll->head) |
5242 | return false; | |
221c5eb2 | 5243 | spin_lock(&poll->head->lock); |
b2e720ac JA |
5244 | if (do_cancel) |
5245 | WRITE_ONCE(poll->canceled, true); | |
392edb45 JA |
5246 | if (!list_empty(&poll->wait.entry)) { |
5247 | list_del_init(&poll->wait.entry); | |
b41e9852 | 5248 | do_complete = true; |
221c5eb2 JA |
5249 | } |
5250 | spin_unlock(&poll->head->lock); | |
3bfa5bcb | 5251 | hash_del(&req->hash_node); |
d7718a9d JA |
5252 | return do_complete; |
5253 | } | |
5254 | ||
b2c3f7e1 | 5255 | static bool io_poll_remove_waitqs(struct io_kiocb *req) |
e07785b0 | 5256 | __must_hold(&req->ctx->completion_lock) |
d7718a9d JA |
5257 | { |
5258 | bool do_complete; | |
5259 | ||
d4e7cd36 | 5260 | io_poll_remove_double(req); |
e31001a3 | 5261 | do_complete = __io_poll_remove_one(req, io_poll_get_single(req), true); |
d4e7cd36 | 5262 | |
e31001a3 | 5263 | if (req->opcode != IORING_OP_POLL_ADD && do_complete) { |
d7718a9d | 5264 | /* non-poll requests have submit ref still */ |
e31001a3 | 5265 | req_ref_put(req); |
b1f573bd | 5266 | } |
b2c3f7e1 JA |
5267 | return do_complete; |
5268 | } | |
5269 | ||
5270 | static bool io_poll_remove_one(struct io_kiocb *req) | |
e07785b0 | 5271 | __must_hold(&req->ctx->completion_lock) |
b2c3f7e1 JA |
5272 | { |
5273 | bool do_complete; | |
b1f573bd | 5274 | |
b2c3f7e1 | 5275 | do_complete = io_poll_remove_waitqs(req); |
b41e9852 | 5276 | if (do_complete) { |
d4d19c19 | 5277 | io_cqring_fill_event(req->ctx, req->user_data, -ECANCELED, 0); |
b41e9852 | 5278 | io_commit_cqring(req->ctx); |
93d2bcd2 | 5279 | req_set_fail(req); |
216578e5 | 5280 | io_put_req_deferred(req, 1); |
b41e9852 JA |
5281 | } |
5282 | ||
5283 | return do_complete; | |
221c5eb2 JA |
5284 | } |
5285 | ||
76e1b642 JA |
5286 | /* |
5287 | * Returns true if we found and killed one or more poll requests | |
5288 | */ | |
6b81928d | 5289 | static bool io_poll_remove_all(struct io_ring_ctx *ctx, struct task_struct *tsk, |
3dd0c97a | 5290 | bool cancel_all) |
221c5eb2 | 5291 | { |
78076bb6 | 5292 | struct hlist_node *tmp; |
221c5eb2 | 5293 | struct io_kiocb *req; |
8e2e1faf | 5294 | int posted = 0, i; |
221c5eb2 JA |
5295 | |
5296 | spin_lock_irq(&ctx->completion_lock); | |
78076bb6 JA |
5297 | for (i = 0; i < (1U << ctx->cancel_hash_bits); i++) { |
5298 | struct hlist_head *list; | |
5299 | ||
5300 | list = &ctx->cancel_hash[i]; | |
f3606e3a | 5301 | hlist_for_each_entry_safe(req, tmp, list, hash_node) { |
3dd0c97a | 5302 | if (io_match_task(req, tsk, cancel_all)) |
f3606e3a JA |
5303 | posted += io_poll_remove_one(req); |
5304 | } | |
221c5eb2 JA |
5305 | } |
5306 | spin_unlock_irq(&ctx->completion_lock); | |
b41e9852 | 5307 | |
8e2e1faf JA |
5308 | if (posted) |
5309 | io_cqring_ev_posted(ctx); | |
76e1b642 JA |
5310 | |
5311 | return posted != 0; | |
221c5eb2 JA |
5312 | } |
5313 | ||
9ba5fac8 PB |
5314 | static struct io_kiocb *io_poll_find(struct io_ring_ctx *ctx, __u64 sqe_addr, |
5315 | bool poll_only) | |
e07785b0 | 5316 | __must_hold(&ctx->completion_lock) |
47f46768 | 5317 | { |
78076bb6 | 5318 | struct hlist_head *list; |
47f46768 JA |
5319 | struct io_kiocb *req; |
5320 | ||
78076bb6 JA |
5321 | list = &ctx->cancel_hash[hash_long(sqe_addr, ctx->cancel_hash_bits)]; |
5322 | hlist_for_each_entry(req, list, hash_node) { | |
b41e9852 JA |
5323 | if (sqe_addr != req->user_data) |
5324 | continue; | |
9ba5fac8 PB |
5325 | if (poll_only && req->opcode != IORING_OP_POLL_ADD) |
5326 | continue; | |
b2cb805f | 5327 | return req; |
47f46768 | 5328 | } |
b2cb805f JA |
5329 | return NULL; |
5330 | } | |
5331 | ||
9ba5fac8 PB |
5332 | static int io_poll_cancel(struct io_ring_ctx *ctx, __u64 sqe_addr, |
5333 | bool poll_only) | |
e07785b0 | 5334 | __must_hold(&ctx->completion_lock) |
b2cb805f JA |
5335 | { |
5336 | struct io_kiocb *req; | |
5337 | ||
9ba5fac8 | 5338 | req = io_poll_find(ctx, sqe_addr, poll_only); |
b2cb805f JA |
5339 | if (!req) |
5340 | return -ENOENT; | |
5341 | if (io_poll_remove_one(req)) | |
5342 | return 0; | |
5343 | ||
5344 | return -EALREADY; | |
47f46768 JA |
5345 | } |
5346 | ||
9096af3e PB |
5347 | static __poll_t io_poll_parse_events(const struct io_uring_sqe *sqe, |
5348 | unsigned int flags) | |
5349 | { | |
5350 | u32 events; | |
47f46768 | 5351 | |
9096af3e PB |
5352 | events = READ_ONCE(sqe->poll32_events); |
5353 | #ifdef __BIG_ENDIAN | |
5354 | events = swahw32(events); | |
5355 | #endif | |
5356 | if (!(flags & IORING_POLL_ADD_MULTI)) | |
5357 | events |= EPOLLONESHOT; | |
5358 | return demangle_poll(events) | (events & (EPOLLEXCLUSIVE|EPOLLONESHOT)); | |
47f46768 JA |
5359 | } |
5360 | ||
c5de0036 | 5361 | static int io_poll_update_prep(struct io_kiocb *req, |
3529d8c2 | 5362 | const struct io_uring_sqe *sqe) |
0969e783 | 5363 | { |
c5de0036 PB |
5364 | struct io_poll_update *upd = &req->poll_update; |
5365 | u32 flags; | |
5366 | ||
0969e783 JA |
5367 | if (unlikely(req->ctx->flags & IORING_SETUP_IOPOLL)) |
5368 | return -EINVAL; | |
c5de0036 PB |
5369 | if (sqe->ioprio || sqe->buf_index) |
5370 | return -EINVAL; | |
5371 | flags = READ_ONCE(sqe->len); | |
5372 | if (flags & ~(IORING_POLL_UPDATE_EVENTS | IORING_POLL_UPDATE_USER_DATA | | |
5373 | IORING_POLL_ADD_MULTI)) | |
5374 | return -EINVAL; | |
5375 | /* meaningless without update */ | |
5376 | if (flags == IORING_POLL_ADD_MULTI) | |
0969e783 JA |
5377 | return -EINVAL; |
5378 | ||
c5de0036 PB |
5379 | upd->old_user_data = READ_ONCE(sqe->addr); |
5380 | upd->update_events = flags & IORING_POLL_UPDATE_EVENTS; | |
5381 | upd->update_user_data = flags & IORING_POLL_UPDATE_USER_DATA; | |
221c5eb2 | 5382 | |
c5de0036 PB |
5383 | upd->new_user_data = READ_ONCE(sqe->off); |
5384 | if (!upd->update_user_data && upd->new_user_data) | |
5385 | return -EINVAL; | |
5386 | if (upd->update_events) | |
5387 | upd->events = io_poll_parse_events(sqe, flags); | |
5388 | else if (sqe->poll32_events) | |
5389 | return -EINVAL; | |
221c5eb2 | 5390 | |
221c5eb2 JA |
5391 | return 0; |
5392 | } | |
5393 | ||
221c5eb2 JA |
5394 | static int io_poll_wake(struct wait_queue_entry *wait, unsigned mode, int sync, |
5395 | void *key) | |
5396 | { | |
c2f2eb7d JA |
5397 | struct io_kiocb *req = wait->private; |
5398 | struct io_poll_iocb *poll = &req->poll; | |
221c5eb2 | 5399 | |
d7718a9d | 5400 | return __io_async_wake(req, poll, key_to_poll(key), io_poll_task_func); |
221c5eb2 JA |
5401 | } |
5402 | ||
221c5eb2 JA |
5403 | static void io_poll_queue_proc(struct file *file, struct wait_queue_head *head, |
5404 | struct poll_table_struct *p) | |
5405 | { | |
5406 | struct io_poll_table *pt = container_of(p, struct io_poll_table, pt); | |
5407 | ||
e8c2bc1f | 5408 | __io_queue_proc(&pt->req->poll, pt, head, (struct io_poll_iocb **) &pt->req->async_data); |
eac406c6 JA |
5409 | } |
5410 | ||
3529d8c2 | 5411 | static int io_poll_add_prep(struct io_kiocb *req, const struct io_uring_sqe *sqe) |
221c5eb2 JA |
5412 | { |
5413 | struct io_poll_iocb *poll = &req->poll; | |
c5de0036 | 5414 | u32 flags; |
221c5eb2 JA |
5415 | |
5416 | if (unlikely(req->ctx->flags & IORING_SETUP_IOPOLL)) | |
5417 | return -EINVAL; | |
c5de0036 | 5418 | if (sqe->ioprio || sqe->buf_index || sqe->off || sqe->addr) |
88e41cf9 JA |
5419 | return -EINVAL; |
5420 | flags = READ_ONCE(sqe->len); | |
c5de0036 | 5421 | if (flags & ~IORING_POLL_ADD_MULTI) |
221c5eb2 JA |
5422 | return -EINVAL; |
5423 | ||
c5de0036 | 5424 | poll->events = io_poll_parse_events(sqe, flags); |
0969e783 JA |
5425 | return 0; |
5426 | } | |
5427 | ||
61e98203 | 5428 | static int io_poll_add(struct io_kiocb *req, unsigned int issue_flags) |
0969e783 JA |
5429 | { |
5430 | struct io_poll_iocb *poll = &req->poll; | |
5431 | struct io_ring_ctx *ctx = req->ctx; | |
5432 | struct io_poll_table ipt; | |
0969e783 | 5433 | __poll_t mask; |
0969e783 | 5434 | |
d7718a9d | 5435 | ipt.pt._qproc = io_poll_queue_proc; |
36703247 | 5436 | |
d7718a9d JA |
5437 | mask = __io_arm_poll_handler(req, &req->poll, &ipt, poll->events, |
5438 | io_poll_wake); | |
221c5eb2 | 5439 | |
8c838788 | 5440 | if (mask) { /* no async, we'd stolen it */ |
221c5eb2 | 5441 | ipt.error = 0; |
e27414be | 5442 | io_poll_complete(req, mask); |
221c5eb2 | 5443 | } |
221c5eb2 JA |
5444 | spin_unlock_irq(&ctx->completion_lock); |
5445 | ||
8c838788 JA |
5446 | if (mask) { |
5447 | io_cqring_ev_posted(ctx); | |
88e41cf9 JA |
5448 | if (poll->events & EPOLLONESHOT) |
5449 | io_put_req(req); | |
221c5eb2 | 5450 | } |
8c838788 | 5451 | return ipt.error; |
221c5eb2 JA |
5452 | } |
5453 | ||
c5de0036 | 5454 | static int io_poll_update(struct io_kiocb *req, unsigned int issue_flags) |
b69de288 JA |
5455 | { |
5456 | struct io_ring_ctx *ctx = req->ctx; | |
5457 | struct io_kiocb *preq; | |
cb3b200e | 5458 | bool completing; |
b69de288 JA |
5459 | int ret; |
5460 | ||
5461 | spin_lock_irq(&ctx->completion_lock); | |
9ba5fac8 | 5462 | preq = io_poll_find(ctx, req->poll_update.old_user_data, true); |
b69de288 JA |
5463 | if (!preq) { |
5464 | ret = -ENOENT; | |
5465 | goto err; | |
b69de288 | 5466 | } |
cb3b200e | 5467 | |
c5de0036 PB |
5468 | if (!req->poll_update.update_events && !req->poll_update.update_user_data) { |
5469 | completing = true; | |
5470 | ret = io_poll_remove_one(preq) ? 0 : -EALREADY; | |
5471 | goto err; | |
5472 | } | |
5473 | ||
cb3b200e JA |
5474 | /* |
5475 | * Don't allow racy completion with singleshot, as we cannot safely | |
5476 | * update those. For multishot, if we're racing with completion, just | |
5477 | * let completion re-add it. | |
5478 | */ | |
5479 | completing = !__io_poll_remove_one(preq, &preq->poll, false); | |
5480 | if (completing && (preq->poll.events & EPOLLONESHOT)) { | |
5481 | ret = -EALREADY; | |
5482 | goto err; | |
b69de288 JA |
5483 | } |
5484 | /* we now have a detached poll request. reissue. */ | |
5485 | ret = 0; | |
5486 | err: | |
b69de288 | 5487 | if (ret < 0) { |
cb3b200e | 5488 | spin_unlock_irq(&ctx->completion_lock); |
93d2bcd2 | 5489 | req_set_fail(req); |
b69de288 JA |
5490 | io_req_complete(req, ret); |
5491 | return 0; | |
5492 | } | |
5493 | /* only mask one event flags, keep behavior flags */ | |
9d805892 | 5494 | if (req->poll_update.update_events) { |
b69de288 | 5495 | preq->poll.events &= ~0xffff; |
9d805892 | 5496 | preq->poll.events |= req->poll_update.events & 0xffff; |
b69de288 JA |
5497 | preq->poll.events |= IO_POLL_UNMASK; |
5498 | } | |
9d805892 PB |
5499 | if (req->poll_update.update_user_data) |
5500 | preq->user_data = req->poll_update.new_user_data; | |
cb3b200e JA |
5501 | spin_unlock_irq(&ctx->completion_lock); |
5502 | ||
b69de288 JA |
5503 | /* complete update request, we're done with it */ |
5504 | io_req_complete(req, ret); | |
5505 | ||
cb3b200e | 5506 | if (!completing) { |
c5de0036 | 5507 | ret = io_poll_add(preq, issue_flags); |
cb3b200e | 5508 | if (ret < 0) { |
93d2bcd2 | 5509 | req_set_fail(preq); |
cb3b200e JA |
5510 | io_req_complete(preq, ret); |
5511 | } | |
b69de288 JA |
5512 | } |
5513 | return 0; | |
5514 | } | |
5515 | ||
5262f567 JA |
5516 | static enum hrtimer_restart io_timeout_fn(struct hrtimer *timer) |
5517 | { | |
ad8a48ac JA |
5518 | struct io_timeout_data *data = container_of(timer, |
5519 | struct io_timeout_data, timer); | |
5520 | struct io_kiocb *req = data->req; | |
5521 | struct io_ring_ctx *ctx = req->ctx; | |
5262f567 JA |
5522 | unsigned long flags; |
5523 | ||
5262f567 | 5524 | spin_lock_irqsave(&ctx->completion_lock, flags); |
a71976f3 | 5525 | list_del_init(&req->timeout.list); |
01cec8c1 PB |
5526 | atomic_set(&req->ctx->cq_timeouts, |
5527 | atomic_read(&req->ctx->cq_timeouts) + 1); | |
5528 | ||
d4d19c19 | 5529 | io_cqring_fill_event(ctx, req->user_data, -ETIME, 0); |
5262f567 JA |
5530 | io_commit_cqring(ctx); |
5531 | spin_unlock_irqrestore(&ctx->completion_lock, flags); | |
5532 | ||
5533 | io_cqring_ev_posted(ctx); | |
93d2bcd2 | 5534 | req_set_fail(req); |
5262f567 JA |
5535 | io_put_req(req); |
5536 | return HRTIMER_NORESTART; | |
5537 | } | |
5538 | ||
fbd15848 PB |
5539 | static struct io_kiocb *io_timeout_extract(struct io_ring_ctx *ctx, |
5540 | __u64 user_data) | |
e07785b0 | 5541 | __must_hold(&ctx->completion_lock) |
f254ac04 | 5542 | { |
fbd15848 | 5543 | struct io_timeout_data *io; |
47f46768 | 5544 | struct io_kiocb *req; |
fd9c7bc5 | 5545 | bool found = false; |
f254ac04 | 5546 | |
135fcde8 | 5547 | list_for_each_entry(req, &ctx->timeout_list, timeout.list) { |
fd9c7bc5 PB |
5548 | found = user_data == req->user_data; |
5549 | if (found) | |
47f46768 | 5550 | break; |
47f46768 | 5551 | } |
fd9c7bc5 PB |
5552 | if (!found) |
5553 | return ERR_PTR(-ENOENT); | |
fbd15848 PB |
5554 | |
5555 | io = req->async_data; | |
fd9c7bc5 | 5556 | if (hrtimer_try_to_cancel(&io->timer) == -1) |
fbd15848 | 5557 | return ERR_PTR(-EALREADY); |
a71976f3 | 5558 | list_del_init(&req->timeout.list); |
fbd15848 PB |
5559 | return req; |
5560 | } | |
47f46768 | 5561 | |
fbd15848 | 5562 | static int io_timeout_cancel(struct io_ring_ctx *ctx, __u64 user_data) |
e07785b0 | 5563 | __must_hold(&ctx->completion_lock) |
fbd15848 PB |
5564 | { |
5565 | struct io_kiocb *req = io_timeout_extract(ctx, user_data); | |
5566 | ||
5567 | if (IS_ERR(req)) | |
5568 | return PTR_ERR(req); | |
f254ac04 | 5569 | |
93d2bcd2 | 5570 | req_set_fail(req); |
d4d19c19 | 5571 | io_cqring_fill_event(ctx, req->user_data, -ECANCELED, 0); |
216578e5 | 5572 | io_put_req_deferred(req, 1); |
f254ac04 JA |
5573 | return 0; |
5574 | } | |
5575 | ||
9c8e11b3 PB |
5576 | static int io_timeout_update(struct io_ring_ctx *ctx, __u64 user_data, |
5577 | struct timespec64 *ts, enum hrtimer_mode mode) | |
e07785b0 | 5578 | __must_hold(&ctx->completion_lock) |
47f46768 | 5579 | { |
9c8e11b3 PB |
5580 | struct io_kiocb *req = io_timeout_extract(ctx, user_data); |
5581 | struct io_timeout_data *data; | |
47f46768 | 5582 | |
9c8e11b3 PB |
5583 | if (IS_ERR(req)) |
5584 | return PTR_ERR(req); | |
47f46768 | 5585 | |
9c8e11b3 PB |
5586 | req->timeout.off = 0; /* noseq */ |
5587 | data = req->async_data; | |
5588 | list_add_tail(&req->timeout.list, &ctx->timeout_list); | |
5589 | hrtimer_init(&data->timer, CLOCK_MONOTONIC, mode); | |
5590 | data->timer.function = io_timeout_fn; | |
5591 | hrtimer_start(&data->timer, timespec64_to_ktime(*ts), mode); | |
5592 | return 0; | |
47f46768 JA |
5593 | } |
5594 | ||
3529d8c2 JA |
5595 | static int io_timeout_remove_prep(struct io_kiocb *req, |
5596 | const struct io_uring_sqe *sqe) | |
b29472ee | 5597 | { |
9c8e11b3 PB |
5598 | struct io_timeout_rem *tr = &req->timeout_rem; |
5599 | ||
b29472ee JA |
5600 | if (unlikely(req->ctx->flags & IORING_SETUP_IOPOLL)) |
5601 | return -EINVAL; | |
61710e43 DA |
5602 | if (unlikely(req->flags & (REQ_F_FIXED_FILE | REQ_F_BUFFER_SELECT))) |
5603 | return -EINVAL; | |
9c8e11b3 | 5604 | if (sqe->ioprio || sqe->buf_index || sqe->len) |
b29472ee JA |
5605 | return -EINVAL; |
5606 | ||
9c8e11b3 PB |
5607 | tr->addr = READ_ONCE(sqe->addr); |
5608 | tr->flags = READ_ONCE(sqe->timeout_flags); | |
5609 | if (tr->flags & IORING_TIMEOUT_UPDATE) { | |
5610 | if (tr->flags & ~(IORING_TIMEOUT_UPDATE|IORING_TIMEOUT_ABS)) | |
5611 | return -EINVAL; | |
5612 | if (get_timespec64(&tr->ts, u64_to_user_ptr(sqe->addr2))) | |
5613 | return -EFAULT; | |
5614 | } else if (tr->flags) { | |
5615 | /* timeout removal doesn't support flags */ | |
b29472ee | 5616 | return -EINVAL; |
9c8e11b3 | 5617 | } |
b29472ee | 5618 | |
b29472ee JA |
5619 | return 0; |
5620 | } | |
5621 | ||
8662daec PB |
5622 | static inline enum hrtimer_mode io_translate_timeout_mode(unsigned int flags) |
5623 | { | |
5624 | return (flags & IORING_TIMEOUT_ABS) ? HRTIMER_MODE_ABS | |
5625 | : HRTIMER_MODE_REL; | |
5626 | } | |
5627 | ||
11365043 JA |
5628 | /* |
5629 | * Remove or update an existing timeout command | |
5630 | */ | |
61e98203 | 5631 | static int io_timeout_remove(struct io_kiocb *req, unsigned int issue_flags) |
11365043 | 5632 | { |
9c8e11b3 | 5633 | struct io_timeout_rem *tr = &req->timeout_rem; |
11365043 | 5634 | struct io_ring_ctx *ctx = req->ctx; |
47f46768 | 5635 | int ret; |
11365043 | 5636 | |
11365043 | 5637 | spin_lock_irq(&ctx->completion_lock); |
8662daec | 5638 | if (!(req->timeout_rem.flags & IORING_TIMEOUT_UPDATE)) |
9c8e11b3 | 5639 | ret = io_timeout_cancel(ctx, tr->addr); |
8662daec PB |
5640 | else |
5641 | ret = io_timeout_update(ctx, tr->addr, &tr->ts, | |
5642 | io_translate_timeout_mode(tr->flags)); | |
11365043 | 5643 | |
d4d19c19 | 5644 | io_cqring_fill_event(ctx, req->user_data, ret, 0); |
11365043 JA |
5645 | io_commit_cqring(ctx); |
5646 | spin_unlock_irq(&ctx->completion_lock); | |
5262f567 | 5647 | io_cqring_ev_posted(ctx); |
4e88d6e7 | 5648 | if (ret < 0) |
93d2bcd2 | 5649 | req_set_fail(req); |
ec9c02ad | 5650 | io_put_req(req); |
11365043 | 5651 | return 0; |
5262f567 JA |
5652 | } |
5653 | ||
3529d8c2 | 5654 | static int io_timeout_prep(struct io_kiocb *req, const struct io_uring_sqe *sqe, |
2d28390a | 5655 | bool is_timeout_link) |
5262f567 | 5656 | { |
ad8a48ac | 5657 | struct io_timeout_data *data; |
a41525ab | 5658 | unsigned flags; |
56080b02 | 5659 | u32 off = READ_ONCE(sqe->off); |
5262f567 | 5660 | |
ad8a48ac | 5661 | if (unlikely(req->ctx->flags & IORING_SETUP_IOPOLL)) |
5262f567 | 5662 | return -EINVAL; |
ad8a48ac | 5663 | if (sqe->ioprio || sqe->buf_index || sqe->len != 1) |
a41525ab | 5664 | return -EINVAL; |
56080b02 | 5665 | if (off && is_timeout_link) |
2d28390a | 5666 | return -EINVAL; |
a41525ab JA |
5667 | flags = READ_ONCE(sqe->timeout_flags); |
5668 | if (flags & ~IORING_TIMEOUT_ABS) | |
5262f567 | 5669 | return -EINVAL; |
bdf20073 | 5670 | |
bfe68a22 | 5671 | req->timeout.off = off; |
f18ee4cf PB |
5672 | if (unlikely(off && !req->ctx->off_timeout_used)) |
5673 | req->ctx->off_timeout_used = true; | |
26a61679 | 5674 | |
e8c2bc1f | 5675 | if (!req->async_data && io_alloc_async_data(req)) |
26a61679 JA |
5676 | return -ENOMEM; |
5677 | ||
e8c2bc1f | 5678 | data = req->async_data; |
ad8a48ac | 5679 | data->req = req; |
ad8a48ac JA |
5680 | |
5681 | if (get_timespec64(&data->ts, u64_to_user_ptr(sqe->addr))) | |
5262f567 JA |
5682 | return -EFAULT; |
5683 | ||
8662daec | 5684 | data->mode = io_translate_timeout_mode(flags); |
ad8a48ac | 5685 | hrtimer_init(&data->timer, CLOCK_MONOTONIC, data->mode); |
2482b58f PB |
5686 | if (is_timeout_link) |
5687 | io_req_track_inflight(req); | |
ad8a48ac JA |
5688 | return 0; |
5689 | } | |
5690 | ||
61e98203 | 5691 | static int io_timeout(struct io_kiocb *req, unsigned int issue_flags) |
ad8a48ac | 5692 | { |
ad8a48ac | 5693 | struct io_ring_ctx *ctx = req->ctx; |
e8c2bc1f | 5694 | struct io_timeout_data *data = req->async_data; |
ad8a48ac | 5695 | struct list_head *entry; |
bfe68a22 | 5696 | u32 tail, off = req->timeout.off; |
ad8a48ac | 5697 | |
733f5c95 | 5698 | spin_lock_irq(&ctx->completion_lock); |
93bd25bb | 5699 | |
5262f567 JA |
5700 | /* |
5701 | * sqe->off holds how many events that need to occur for this | |
93bd25bb JA |
5702 | * timeout event to be satisfied. If it isn't set, then this is |
5703 | * a pure timeout request, sequence isn't used. | |
5262f567 | 5704 | */ |
8eb7e2d0 | 5705 | if (io_is_timeout_noseq(req)) { |
93bd25bb JA |
5706 | entry = ctx->timeout_list.prev; |
5707 | goto add; | |
5708 | } | |
5262f567 | 5709 | |
bfe68a22 PB |
5710 | tail = ctx->cached_cq_tail - atomic_read(&ctx->cq_timeouts); |
5711 | req->timeout.target_seq = tail + off; | |
5262f567 | 5712 | |
f010505b MDG |
5713 | /* Update the last seq here in case io_flush_timeouts() hasn't. |
5714 | * This is safe because ->completion_lock is held, and submissions | |
5715 | * and completions are never mixed in the same ->completion_lock section. | |
5716 | */ | |
5717 | ctx->cq_last_tm_flush = tail; | |
5718 | ||
5262f567 JA |
5719 | /* |
5720 | * Insertion sort, ensuring the first entry in the list is always | |
5721 | * the one we need first. | |
5722 | */ | |
5262f567 | 5723 | list_for_each_prev(entry, &ctx->timeout_list) { |
135fcde8 PB |
5724 | struct io_kiocb *nxt = list_entry(entry, struct io_kiocb, |
5725 | timeout.list); | |
5262f567 | 5726 | |
8eb7e2d0 | 5727 | if (io_is_timeout_noseq(nxt)) |
93bd25bb | 5728 | continue; |
bfe68a22 PB |
5729 | /* nxt.seq is behind @tail, otherwise would've been completed */ |
5730 | if (off >= nxt->timeout.target_seq - tail) | |
5262f567 JA |
5731 | break; |
5732 | } | |
93bd25bb | 5733 | add: |
135fcde8 | 5734 | list_add(&req->timeout.list, entry); |
ad8a48ac JA |
5735 | data->timer.function = io_timeout_fn; |
5736 | hrtimer_start(&data->timer, timespec64_to_ktime(data->ts), data->mode); | |
5262f567 | 5737 | spin_unlock_irq(&ctx->completion_lock); |
5262f567 JA |
5738 | return 0; |
5739 | } | |
5262f567 | 5740 | |
f458dd84 PB |
5741 | struct io_cancel_data { |
5742 | struct io_ring_ctx *ctx; | |
5743 | u64 user_data; | |
5744 | }; | |
5745 | ||
62755e35 JA |
5746 | static bool io_cancel_cb(struct io_wq_work *work, void *data) |
5747 | { | |
5748 | struct io_kiocb *req = container_of(work, struct io_kiocb, work); | |
f458dd84 | 5749 | struct io_cancel_data *cd = data; |
62755e35 | 5750 | |
f458dd84 | 5751 | return req->ctx == cd->ctx && req->user_data == cd->user_data; |
62755e35 JA |
5752 | } |
5753 | ||
f458dd84 PB |
5754 | static int io_async_cancel_one(struct io_uring_task *tctx, u64 user_data, |
5755 | struct io_ring_ctx *ctx) | |
62755e35 | 5756 | { |
f458dd84 | 5757 | struct io_cancel_data data = { .ctx = ctx, .user_data = user_data, }; |
62755e35 | 5758 | enum io_wq_cancel cancel_ret; |
62755e35 JA |
5759 | int ret = 0; |
5760 | ||
f458dd84 | 5761 | if (!tctx || !tctx->io_wq) |
5aa75ed5 JA |
5762 | return -ENOENT; |
5763 | ||
f458dd84 | 5764 | cancel_ret = io_wq_cancel_cb(tctx->io_wq, io_cancel_cb, &data, false); |
62755e35 JA |
5765 | switch (cancel_ret) { |
5766 | case IO_WQ_CANCEL_OK: | |
5767 | ret = 0; | |
5768 | break; | |
5769 | case IO_WQ_CANCEL_RUNNING: | |
5770 | ret = -EALREADY; | |
5771 | break; | |
5772 | case IO_WQ_CANCEL_NOTFOUND: | |
5773 | ret = -ENOENT; | |
5774 | break; | |
5775 | } | |
5776 | ||
e977d6d3 JA |
5777 | return ret; |
5778 | } | |
5779 | ||
47f46768 JA |
5780 | static void io_async_find_and_cancel(struct io_ring_ctx *ctx, |
5781 | struct io_kiocb *req, __u64 sqe_addr, | |
014db007 | 5782 | int success_ret) |
47f46768 JA |
5783 | { |
5784 | unsigned long flags; | |
5785 | int ret; | |
5786 | ||
f458dd84 | 5787 | ret = io_async_cancel_one(req->task->io_uring, sqe_addr, ctx); |
47f46768 | 5788 | spin_lock_irqsave(&ctx->completion_lock, flags); |
df9727af PB |
5789 | if (ret != -ENOENT) |
5790 | goto done; | |
47f46768 JA |
5791 | ret = io_timeout_cancel(ctx, sqe_addr); |
5792 | if (ret != -ENOENT) | |
5793 | goto done; | |
9ba5fac8 | 5794 | ret = io_poll_cancel(ctx, sqe_addr, false); |
47f46768 | 5795 | done: |
b0dd8a41 JA |
5796 | if (!ret) |
5797 | ret = success_ret; | |
d4d19c19 | 5798 | io_cqring_fill_event(ctx, req->user_data, ret, 0); |
47f46768 JA |
5799 | io_commit_cqring(ctx); |
5800 | spin_unlock_irqrestore(&ctx->completion_lock, flags); | |
5801 | io_cqring_ev_posted(ctx); | |
5802 | ||
4e88d6e7 | 5803 | if (ret < 0) |
93d2bcd2 | 5804 | req_set_fail(req); |
47f46768 JA |
5805 | } |
5806 | ||
3529d8c2 JA |
5807 | static int io_async_cancel_prep(struct io_kiocb *req, |
5808 | const struct io_uring_sqe *sqe) | |
e977d6d3 | 5809 | { |
fbf23849 | 5810 | if (unlikely(req->ctx->flags & IORING_SETUP_IOPOLL)) |
e977d6d3 | 5811 | return -EINVAL; |
61710e43 DA |
5812 | if (unlikely(req->flags & (REQ_F_FIXED_FILE | REQ_F_BUFFER_SELECT))) |
5813 | return -EINVAL; | |
5814 | if (sqe->ioprio || sqe->off || sqe->len || sqe->cancel_flags) | |
e977d6d3 JA |
5815 | return -EINVAL; |
5816 | ||
fbf23849 JA |
5817 | req->cancel.addr = READ_ONCE(sqe->addr); |
5818 | return 0; | |
5819 | } | |
5820 | ||
61e98203 | 5821 | static int io_async_cancel(struct io_kiocb *req, unsigned int issue_flags) |
fbf23849 JA |
5822 | { |
5823 | struct io_ring_ctx *ctx = req->ctx; | |
58f99373 PB |
5824 | u64 sqe_addr = req->cancel.addr; |
5825 | struct io_tctx_node *node; | |
5826 | int ret; | |
5827 | ||
5828 | /* tasks should wait for their io-wq threads, so safe w/o sync */ | |
5829 | ret = io_async_cancel_one(req->task->io_uring, sqe_addr, ctx); | |
5830 | spin_lock_irq(&ctx->completion_lock); | |
5831 | if (ret != -ENOENT) | |
5832 | goto done; | |
5833 | ret = io_timeout_cancel(ctx, sqe_addr); | |
5834 | if (ret != -ENOENT) | |
5835 | goto done; | |
9ba5fac8 | 5836 | ret = io_poll_cancel(ctx, sqe_addr, false); |
58f99373 PB |
5837 | if (ret != -ENOENT) |
5838 | goto done; | |
5839 | spin_unlock_irq(&ctx->completion_lock); | |
5840 | ||
5841 | /* slow path, try all io-wq's */ | |
5842 | io_ring_submit_lock(ctx, !(issue_flags & IO_URING_F_NONBLOCK)); | |
5843 | ret = -ENOENT; | |
5844 | list_for_each_entry(node, &ctx->tctx_list, ctx_node) { | |
5845 | struct io_uring_task *tctx = node->task->io_uring; | |
fbf23849 | 5846 | |
58f99373 PB |
5847 | ret = io_async_cancel_one(tctx, req->cancel.addr, ctx); |
5848 | if (ret != -ENOENT) | |
5849 | break; | |
5850 | } | |
5851 | io_ring_submit_unlock(ctx, !(issue_flags & IO_URING_F_NONBLOCK)); | |
5852 | ||
5853 | spin_lock_irq(&ctx->completion_lock); | |
5854 | done: | |
d4d19c19 | 5855 | io_cqring_fill_event(ctx, req->user_data, ret, 0); |
58f99373 PB |
5856 | io_commit_cqring(ctx); |
5857 | spin_unlock_irq(&ctx->completion_lock); | |
5858 | io_cqring_ev_posted(ctx); | |
5859 | ||
5860 | if (ret < 0) | |
93d2bcd2 | 5861 | req_set_fail(req); |
58f99373 | 5862 | io_put_req(req); |
5262f567 JA |
5863 | return 0; |
5864 | } | |
5865 | ||
269bbe5f | 5866 | static int io_rsrc_update_prep(struct io_kiocb *req, |
05f3fb3c JA |
5867 | const struct io_uring_sqe *sqe) |
5868 | { | |
61710e43 DA |
5869 | if (unlikely(req->flags & (REQ_F_FIXED_FILE | REQ_F_BUFFER_SELECT))) |
5870 | return -EINVAL; | |
5871 | if (sqe->ioprio || sqe->rw_flags) | |
05f3fb3c JA |
5872 | return -EINVAL; |
5873 | ||
269bbe5f BM |
5874 | req->rsrc_update.offset = READ_ONCE(sqe->off); |
5875 | req->rsrc_update.nr_args = READ_ONCE(sqe->len); | |
5876 | if (!req->rsrc_update.nr_args) | |
05f3fb3c | 5877 | return -EINVAL; |
269bbe5f | 5878 | req->rsrc_update.arg = READ_ONCE(sqe->addr); |
05f3fb3c JA |
5879 | return 0; |
5880 | } | |
5881 | ||
889fca73 | 5882 | static int io_files_update(struct io_kiocb *req, unsigned int issue_flags) |
fbf23849 JA |
5883 | { |
5884 | struct io_ring_ctx *ctx = req->ctx; | |
c3bdad02 | 5885 | struct io_uring_rsrc_update2 up; |
05f3fb3c | 5886 | int ret; |
fbf23849 | 5887 | |
45d189c6 | 5888 | if (issue_flags & IO_URING_F_NONBLOCK) |
05f3fb3c | 5889 | return -EAGAIN; |
05f3fb3c | 5890 | |
269bbe5f BM |
5891 | up.offset = req->rsrc_update.offset; |
5892 | up.data = req->rsrc_update.arg; | |
c3bdad02 PB |
5893 | up.nr = 0; |
5894 | up.tags = 0; | |
615cee49 | 5895 | up.resv = 0; |
05f3fb3c JA |
5896 | |
5897 | mutex_lock(&ctx->uring_lock); | |
fdecb662 | 5898 | ret = __io_register_rsrc_update(ctx, IORING_RSRC_FILE, |
98f0b3b4 | 5899 | &up, req->rsrc_update.nr_args); |
05f3fb3c JA |
5900 | mutex_unlock(&ctx->uring_lock); |
5901 | ||
5902 | if (ret < 0) | |
93d2bcd2 | 5903 | req_set_fail(req); |
889fca73 | 5904 | __io_req_complete(req, issue_flags, ret, 0); |
5262f567 JA |
5905 | return 0; |
5906 | } | |
5907 | ||
bfe76559 | 5908 | static int io_req_prep(struct io_kiocb *req, const struct io_uring_sqe *sqe) |
f67676d1 | 5909 | { |
d625c6ee | 5910 | switch (req->opcode) { |
e781573e | 5911 | case IORING_OP_NOP: |
bfe76559 | 5912 | return 0; |
f67676d1 JA |
5913 | case IORING_OP_READV: |
5914 | case IORING_OP_READ_FIXED: | |
3a6820f2 | 5915 | case IORING_OP_READ: |
bfe76559 | 5916 | return io_read_prep(req, sqe); |
f67676d1 JA |
5917 | case IORING_OP_WRITEV: |
5918 | case IORING_OP_WRITE_FIXED: | |
3a6820f2 | 5919 | case IORING_OP_WRITE: |
bfe76559 | 5920 | return io_write_prep(req, sqe); |
0969e783 | 5921 | case IORING_OP_POLL_ADD: |
bfe76559 | 5922 | return io_poll_add_prep(req, sqe); |
0969e783 | 5923 | case IORING_OP_POLL_REMOVE: |
c5de0036 | 5924 | return io_poll_update_prep(req, sqe); |
8ed8d3c3 | 5925 | case IORING_OP_FSYNC: |
1155c76a | 5926 | return io_fsync_prep(req, sqe); |
8ed8d3c3 | 5927 | case IORING_OP_SYNC_FILE_RANGE: |
1155c76a | 5928 | return io_sfr_prep(req, sqe); |
03b1230c | 5929 | case IORING_OP_SENDMSG: |
fddaface | 5930 | case IORING_OP_SEND: |
bfe76559 | 5931 | return io_sendmsg_prep(req, sqe); |
03b1230c | 5932 | case IORING_OP_RECVMSG: |
fddaface | 5933 | case IORING_OP_RECV: |
bfe76559 | 5934 | return io_recvmsg_prep(req, sqe); |
f499a021 | 5935 | case IORING_OP_CONNECT: |
bfe76559 | 5936 | return io_connect_prep(req, sqe); |
2d28390a | 5937 | case IORING_OP_TIMEOUT: |
bfe76559 | 5938 | return io_timeout_prep(req, sqe, false); |
b29472ee | 5939 | case IORING_OP_TIMEOUT_REMOVE: |
bfe76559 | 5940 | return io_timeout_remove_prep(req, sqe); |
fbf23849 | 5941 | case IORING_OP_ASYNC_CANCEL: |
bfe76559 | 5942 | return io_async_cancel_prep(req, sqe); |
2d28390a | 5943 | case IORING_OP_LINK_TIMEOUT: |
bfe76559 | 5944 | return io_timeout_prep(req, sqe, true); |
8ed8d3c3 | 5945 | case IORING_OP_ACCEPT: |
bfe76559 | 5946 | return io_accept_prep(req, sqe); |
d63d1b5e | 5947 | case IORING_OP_FALLOCATE: |
bfe76559 | 5948 | return io_fallocate_prep(req, sqe); |
15b71abe | 5949 | case IORING_OP_OPENAT: |
bfe76559 | 5950 | return io_openat_prep(req, sqe); |
b5dba59e | 5951 | case IORING_OP_CLOSE: |
bfe76559 | 5952 | return io_close_prep(req, sqe); |
05f3fb3c | 5953 | case IORING_OP_FILES_UPDATE: |
269bbe5f | 5954 | return io_rsrc_update_prep(req, sqe); |
eddc7ef5 | 5955 | case IORING_OP_STATX: |
bfe76559 | 5956 | return io_statx_prep(req, sqe); |
4840e418 | 5957 | case IORING_OP_FADVISE: |
bfe76559 | 5958 | return io_fadvise_prep(req, sqe); |
c1ca757b | 5959 | case IORING_OP_MADVISE: |
bfe76559 | 5960 | return io_madvise_prep(req, sqe); |
cebdb986 | 5961 | case IORING_OP_OPENAT2: |
bfe76559 | 5962 | return io_openat2_prep(req, sqe); |
3e4827b0 | 5963 | case IORING_OP_EPOLL_CTL: |
bfe76559 | 5964 | return io_epoll_ctl_prep(req, sqe); |
7d67af2c | 5965 | case IORING_OP_SPLICE: |
bfe76559 | 5966 | return io_splice_prep(req, sqe); |
ddf0322d | 5967 | case IORING_OP_PROVIDE_BUFFERS: |
bfe76559 | 5968 | return io_provide_buffers_prep(req, sqe); |
067524e9 | 5969 | case IORING_OP_REMOVE_BUFFERS: |
bfe76559 | 5970 | return io_remove_buffers_prep(req, sqe); |
f2a8d5c7 | 5971 | case IORING_OP_TEE: |
bfe76559 | 5972 | return io_tee_prep(req, sqe); |
36f4fa68 JA |
5973 | case IORING_OP_SHUTDOWN: |
5974 | return io_shutdown_prep(req, sqe); | |
80a261fd JA |
5975 | case IORING_OP_RENAMEAT: |
5976 | return io_renameat_prep(req, sqe); | |
14a1143b JA |
5977 | case IORING_OP_UNLINKAT: |
5978 | return io_unlinkat_prep(req, sqe); | |
f67676d1 JA |
5979 | } |
5980 | ||
bfe76559 PB |
5981 | printk_once(KERN_WARNING "io_uring: unhandled opcode %d\n", |
5982 | req->opcode); | |
bd54b6fe | 5983 | return -EINVAL; |
bfe76559 PB |
5984 | } |
5985 | ||
93642ef8 | 5986 | static int io_req_prep_async(struct io_kiocb *req) |
bfe76559 | 5987 | { |
b7e298d2 PB |
5988 | if (!io_op_defs[req->opcode].needs_async_setup) |
5989 | return 0; | |
5990 | if (WARN_ON_ONCE(req->async_data)) | |
5991 | return -EFAULT; | |
5992 | if (io_alloc_async_data(req)) | |
5993 | return -EAGAIN; | |
5994 | ||
93642ef8 PB |
5995 | switch (req->opcode) { |
5996 | case IORING_OP_READV: | |
93642ef8 PB |
5997 | return io_rw_prep_async(req, READ); |
5998 | case IORING_OP_WRITEV: | |
93642ef8 PB |
5999 | return io_rw_prep_async(req, WRITE); |
6000 | case IORING_OP_SENDMSG: | |
93642ef8 PB |
6001 | return io_sendmsg_prep_async(req); |
6002 | case IORING_OP_RECVMSG: | |
93642ef8 PB |
6003 | return io_recvmsg_prep_async(req); |
6004 | case IORING_OP_CONNECT: | |
6005 | return io_connect_prep_async(req); | |
6006 | } | |
b7e298d2 PB |
6007 | printk_once(KERN_WARNING "io_uring: prep_async() bad opcode %d\n", |
6008 | req->opcode); | |
6009 | return -EFAULT; | |
f67676d1 JA |
6010 | } |
6011 | ||
9cf7c104 PB |
6012 | static u32 io_get_sequence(struct io_kiocb *req) |
6013 | { | |
a3dbdf54 | 6014 | u32 seq = req->ctx->cached_sq_head; |
9cf7c104 | 6015 | |
a3dbdf54 PB |
6016 | /* need original cached_sq_head, but it was increased for each req */ |
6017 | io_for_each_link(req, req) | |
6018 | seq--; | |
6019 | return seq; | |
9cf7c104 PB |
6020 | } |
6021 | ||
76cc33d7 | 6022 | static bool io_drain_req(struct io_kiocb *req) |
de0617e4 | 6023 | { |
3c19966d | 6024 | struct io_kiocb *pos; |
a197f664 | 6025 | struct io_ring_ctx *ctx = req->ctx; |
27dc8338 | 6026 | struct io_defer_entry *de; |
f67676d1 | 6027 | int ret; |
9cf7c104 | 6028 | u32 seq; |
de0617e4 | 6029 | |
3c19966d PB |
6030 | /* |
6031 | * If we need to drain a request in the middle of a link, drain the | |
6032 | * head request and the next request/link after the current link. | |
6033 | * Considering sequential execution of links, IOSQE_IO_DRAIN will be | |
6034 | * maintained for every request of our link. | |
6035 | */ | |
6036 | if (ctx->drain_next) { | |
6037 | req->flags |= REQ_F_IO_DRAIN; | |
6038 | ctx->drain_next = false; | |
6039 | } | |
6040 | /* not interested in head, start from the first linked */ | |
6041 | io_for_each_link(pos, req->link) { | |
6042 | if (pos->flags & REQ_F_IO_DRAIN) { | |
6043 | ctx->drain_next = true; | |
6044 | req->flags |= REQ_F_IO_DRAIN; | |
6045 | break; | |
6046 | } | |
6047 | } | |
6048 | ||
9d858b21 | 6049 | /* Still need defer if there is pending req in defer list. */ |
9cf7c104 | 6050 | if (likely(list_empty_careful(&ctx->defer_list) && |
10c66904 PB |
6051 | !(req->flags & REQ_F_IO_DRAIN))) { |
6052 | ctx->drain_active = false; | |
76cc33d7 | 6053 | return false; |
10c66904 | 6054 | } |
9cf7c104 PB |
6055 | |
6056 | seq = io_get_sequence(req); | |
6057 | /* Still a chance to pass the sequence check */ | |
6058 | if (!req_need_defer(req, seq) && list_empty_careful(&ctx->defer_list)) | |
76cc33d7 | 6059 | return false; |
de0617e4 | 6060 | |
b7e298d2 | 6061 | ret = io_req_prep_async(req); |
be7053b7 | 6062 | if (ret) |
1b48773f | 6063 | goto fail; |
cbdcb435 | 6064 | io_prep_async_link(req); |
27dc8338 | 6065 | de = kmalloc(sizeof(*de), GFP_KERNEL); |
76cc33d7 | 6066 | if (!de) { |
1b48773f PB |
6067 | ret = -ENOMEM; |
6068 | fail: | |
6069 | io_req_complete_failed(req, ret); | |
76cc33d7 PB |
6070 | return true; |
6071 | } | |
2d28390a | 6072 | |
de0617e4 | 6073 | spin_lock_irq(&ctx->completion_lock); |
9cf7c104 | 6074 | if (!req_need_defer(req, seq) && list_empty(&ctx->defer_list)) { |
de0617e4 | 6075 | spin_unlock_irq(&ctx->completion_lock); |
27dc8338 | 6076 | kfree(de); |
ae34817b | 6077 | io_queue_async_work(req); |
76cc33d7 | 6078 | return true; |
de0617e4 JA |
6079 | } |
6080 | ||
915967f6 | 6081 | trace_io_uring_defer(ctx, req, req->user_data); |
27dc8338 | 6082 | de->req = req; |
9cf7c104 | 6083 | de->seq = seq; |
27dc8338 | 6084 | list_add_tail(&de->list, &ctx->defer_list); |
de0617e4 | 6085 | spin_unlock_irq(&ctx->completion_lock); |
76cc33d7 | 6086 | return true; |
de0617e4 JA |
6087 | } |
6088 | ||
68fb8979 | 6089 | static void io_clean_op(struct io_kiocb *req) |
99bc4c38 | 6090 | { |
0e1b6fe3 PB |
6091 | if (req->flags & REQ_F_BUFFER_SELECTED) { |
6092 | switch (req->opcode) { | |
6093 | case IORING_OP_READV: | |
6094 | case IORING_OP_READ_FIXED: | |
6095 | case IORING_OP_READ: | |
bcda7baa | 6096 | kfree((void *)(unsigned long)req->rw.addr); |
0e1b6fe3 PB |
6097 | break; |
6098 | case IORING_OP_RECVMSG: | |
6099 | case IORING_OP_RECV: | |
bcda7baa | 6100 | kfree(req->sr_msg.kbuf); |
0e1b6fe3 PB |
6101 | break; |
6102 | } | |
99bc4c38 PB |
6103 | } |
6104 | ||
0e1b6fe3 PB |
6105 | if (req->flags & REQ_F_NEED_CLEANUP) { |
6106 | switch (req->opcode) { | |
6107 | case IORING_OP_READV: | |
6108 | case IORING_OP_READ_FIXED: | |
6109 | case IORING_OP_READ: | |
6110 | case IORING_OP_WRITEV: | |
6111 | case IORING_OP_WRITE_FIXED: | |
e8c2bc1f JA |
6112 | case IORING_OP_WRITE: { |
6113 | struct io_async_rw *io = req->async_data; | |
1dacb4df PB |
6114 | |
6115 | kfree(io->free_iovec); | |
0e1b6fe3 | 6116 | break; |
e8c2bc1f | 6117 | } |
0e1b6fe3 | 6118 | case IORING_OP_RECVMSG: |
e8c2bc1f JA |
6119 | case IORING_OP_SENDMSG: { |
6120 | struct io_async_msghdr *io = req->async_data; | |
257e84a5 PB |
6121 | |
6122 | kfree(io->free_iov); | |
0e1b6fe3 | 6123 | break; |
e8c2bc1f | 6124 | } |
0e1b6fe3 PB |
6125 | case IORING_OP_SPLICE: |
6126 | case IORING_OP_TEE: | |
e1d767f0 PB |
6127 | if (!(req->splice.flags & SPLICE_F_FD_IN_FIXED)) |
6128 | io_put_file(req->splice.file_in); | |
0e1b6fe3 | 6129 | break; |
f3cd4850 JA |
6130 | case IORING_OP_OPENAT: |
6131 | case IORING_OP_OPENAT2: | |
6132 | if (req->open.filename) | |
6133 | putname(req->open.filename); | |
6134 | break; | |
80a261fd JA |
6135 | case IORING_OP_RENAMEAT: |
6136 | putname(req->rename.oldpath); | |
6137 | putname(req->rename.newpath); | |
6138 | break; | |
14a1143b JA |
6139 | case IORING_OP_UNLINKAT: |
6140 | putname(req->unlink.filename); | |
6141 | break; | |
0e1b6fe3 | 6142 | } |
99bc4c38 | 6143 | } |
75652a30 JA |
6144 | if ((req->flags & REQ_F_POLLED) && req->apoll) { |
6145 | kfree(req->apoll->double_poll); | |
6146 | kfree(req->apoll); | |
6147 | req->apoll = NULL; | |
6148 | } | |
3a0a6902 PB |
6149 | if (req->flags & REQ_F_INFLIGHT) { |
6150 | struct io_uring_task *tctx = req->task->io_uring; | |
6151 | ||
6152 | atomic_dec(&tctx->inflight_tracked); | |
3a0a6902 | 6153 | } |
c854357b | 6154 | if (req->flags & REQ_F_CREDS) |
b8e64b53 | 6155 | put_cred(req->creds); |
c854357b PB |
6156 | |
6157 | req->flags &= ~IO_REQ_CLEAN_FLAGS; | |
99bc4c38 PB |
6158 | } |
6159 | ||
889fca73 | 6160 | static int io_issue_sqe(struct io_kiocb *req, unsigned int issue_flags) |
2b188cc1 | 6161 | { |
a197f664 | 6162 | struct io_ring_ctx *ctx = req->ctx; |
5730b27e | 6163 | const struct cred *creds = NULL; |
d625c6ee | 6164 | int ret; |
2b188cc1 | 6165 | |
b8e64b53 | 6166 | if ((req->flags & REQ_F_CREDS) && req->creds != current_cred()) |
c10d1f98 | 6167 | creds = override_creds(req->creds); |
5730b27e | 6168 | |
d625c6ee | 6169 | switch (req->opcode) { |
2b188cc1 | 6170 | case IORING_OP_NOP: |
889fca73 | 6171 | ret = io_nop(req, issue_flags); |
2b188cc1 JA |
6172 | break; |
6173 | case IORING_OP_READV: | |
edafccee | 6174 | case IORING_OP_READ_FIXED: |
3a6820f2 | 6175 | case IORING_OP_READ: |
889fca73 | 6176 | ret = io_read(req, issue_flags); |
edafccee | 6177 | break; |
3529d8c2 | 6178 | case IORING_OP_WRITEV: |
edafccee | 6179 | case IORING_OP_WRITE_FIXED: |
3a6820f2 | 6180 | case IORING_OP_WRITE: |
889fca73 | 6181 | ret = io_write(req, issue_flags); |
2b188cc1 | 6182 | break; |
c992fe29 | 6183 | case IORING_OP_FSYNC: |
45d189c6 | 6184 | ret = io_fsync(req, issue_flags); |
c992fe29 | 6185 | break; |
221c5eb2 | 6186 | case IORING_OP_POLL_ADD: |
61e98203 | 6187 | ret = io_poll_add(req, issue_flags); |
221c5eb2 JA |
6188 | break; |
6189 | case IORING_OP_POLL_REMOVE: | |
c5de0036 | 6190 | ret = io_poll_update(req, issue_flags); |
221c5eb2 | 6191 | break; |
5d17b4a4 | 6192 | case IORING_OP_SYNC_FILE_RANGE: |
45d189c6 | 6193 | ret = io_sync_file_range(req, issue_flags); |
5d17b4a4 | 6194 | break; |
0fa03c62 | 6195 | case IORING_OP_SENDMSG: |
889fca73 | 6196 | ret = io_sendmsg(req, issue_flags); |
062d04d7 | 6197 | break; |
fddaface | 6198 | case IORING_OP_SEND: |
889fca73 | 6199 | ret = io_send(req, issue_flags); |
0fa03c62 | 6200 | break; |
aa1fa28f | 6201 | case IORING_OP_RECVMSG: |
889fca73 | 6202 | ret = io_recvmsg(req, issue_flags); |
062d04d7 | 6203 | break; |
fddaface | 6204 | case IORING_OP_RECV: |
889fca73 | 6205 | ret = io_recv(req, issue_flags); |
aa1fa28f | 6206 | break; |
5262f567 | 6207 | case IORING_OP_TIMEOUT: |
61e98203 | 6208 | ret = io_timeout(req, issue_flags); |
5262f567 | 6209 | break; |
11365043 | 6210 | case IORING_OP_TIMEOUT_REMOVE: |
61e98203 | 6211 | ret = io_timeout_remove(req, issue_flags); |
11365043 | 6212 | break; |
17f2fe35 | 6213 | case IORING_OP_ACCEPT: |
889fca73 | 6214 | ret = io_accept(req, issue_flags); |
17f2fe35 | 6215 | break; |
f8e85cf2 | 6216 | case IORING_OP_CONNECT: |
889fca73 | 6217 | ret = io_connect(req, issue_flags); |
f8e85cf2 | 6218 | break; |
62755e35 | 6219 | case IORING_OP_ASYNC_CANCEL: |
61e98203 | 6220 | ret = io_async_cancel(req, issue_flags); |
62755e35 | 6221 | break; |
d63d1b5e | 6222 | case IORING_OP_FALLOCATE: |
45d189c6 | 6223 | ret = io_fallocate(req, issue_flags); |
d63d1b5e | 6224 | break; |
15b71abe | 6225 | case IORING_OP_OPENAT: |
45d189c6 | 6226 | ret = io_openat(req, issue_flags); |
15b71abe | 6227 | break; |
b5dba59e | 6228 | case IORING_OP_CLOSE: |
889fca73 | 6229 | ret = io_close(req, issue_flags); |
b5dba59e | 6230 | break; |
05f3fb3c | 6231 | case IORING_OP_FILES_UPDATE: |
889fca73 | 6232 | ret = io_files_update(req, issue_flags); |
05f3fb3c | 6233 | break; |
eddc7ef5 | 6234 | case IORING_OP_STATX: |
45d189c6 | 6235 | ret = io_statx(req, issue_flags); |
eddc7ef5 | 6236 | break; |
4840e418 | 6237 | case IORING_OP_FADVISE: |
45d189c6 | 6238 | ret = io_fadvise(req, issue_flags); |
4840e418 | 6239 | break; |
c1ca757b | 6240 | case IORING_OP_MADVISE: |
45d189c6 | 6241 | ret = io_madvise(req, issue_flags); |
c1ca757b | 6242 | break; |
cebdb986 | 6243 | case IORING_OP_OPENAT2: |
45d189c6 | 6244 | ret = io_openat2(req, issue_flags); |
cebdb986 | 6245 | break; |
3e4827b0 | 6246 | case IORING_OP_EPOLL_CTL: |
889fca73 | 6247 | ret = io_epoll_ctl(req, issue_flags); |
3e4827b0 | 6248 | break; |
7d67af2c | 6249 | case IORING_OP_SPLICE: |
45d189c6 | 6250 | ret = io_splice(req, issue_flags); |
7d67af2c | 6251 | break; |
ddf0322d | 6252 | case IORING_OP_PROVIDE_BUFFERS: |
889fca73 | 6253 | ret = io_provide_buffers(req, issue_flags); |
ddf0322d | 6254 | break; |
067524e9 | 6255 | case IORING_OP_REMOVE_BUFFERS: |
889fca73 | 6256 | ret = io_remove_buffers(req, issue_flags); |
3e4827b0 | 6257 | break; |
f2a8d5c7 | 6258 | case IORING_OP_TEE: |
45d189c6 | 6259 | ret = io_tee(req, issue_flags); |
f2a8d5c7 | 6260 | break; |
36f4fa68 | 6261 | case IORING_OP_SHUTDOWN: |
45d189c6 | 6262 | ret = io_shutdown(req, issue_flags); |
36f4fa68 | 6263 | break; |
80a261fd | 6264 | case IORING_OP_RENAMEAT: |
45d189c6 | 6265 | ret = io_renameat(req, issue_flags); |
80a261fd | 6266 | break; |
14a1143b | 6267 | case IORING_OP_UNLINKAT: |
45d189c6 | 6268 | ret = io_unlinkat(req, issue_flags); |
14a1143b | 6269 | break; |
2b188cc1 JA |
6270 | default: |
6271 | ret = -EINVAL; | |
6272 | break; | |
6273 | } | |
6274 | ||
5730b27e JA |
6275 | if (creds) |
6276 | revert_creds(creds); | |
def596e9 JA |
6277 | if (ret) |
6278 | return ret; | |
b532576e | 6279 | /* If the op doesn't have a file, we're not polling for it */ |
cb3d8972 PB |
6280 | if ((ctx->flags & IORING_SETUP_IOPOLL) && req->file) |
6281 | io_iopoll_req_issued(req); | |
def596e9 JA |
6282 | |
6283 | return 0; | |
2b188cc1 JA |
6284 | } |
6285 | ||
ebc11b6c PB |
6286 | static struct io_wq_work *io_wq_free_work(struct io_wq_work *work) |
6287 | { | |
6288 | struct io_kiocb *req = container_of(work, struct io_kiocb, work); | |
6289 | ||
6290 | req = io_put_req_find_next(req); | |
6291 | return req ? &req->work : NULL; | |
6292 | } | |
6293 | ||
5280f7e5 | 6294 | static void io_wq_submit_work(struct io_wq_work *work) |
2b188cc1 JA |
6295 | { |
6296 | struct io_kiocb *req = container_of(work, struct io_kiocb, work); | |
6df1db6b | 6297 | struct io_kiocb *timeout; |
561fb04a | 6298 | int ret = 0; |
2b188cc1 | 6299 | |
6df1db6b PB |
6300 | timeout = io_prep_linked_timeout(req); |
6301 | if (timeout) | |
6302 | io_queue_linked_timeout(timeout); | |
d4c81f38 | 6303 | |
4014d943 | 6304 | if (work->flags & IO_WQ_WORK_CANCEL) |
561fb04a | 6305 | ret = -ECANCELED; |
31b51510 | 6306 | |
561fb04a | 6307 | if (!ret) { |
561fb04a | 6308 | do { |
889fca73 | 6309 | ret = io_issue_sqe(req, 0); |
561fb04a JA |
6310 | /* |
6311 | * We can get EAGAIN for polled IO even though we're | |
6312 | * forcing a sync submission from here, since we can't | |
6313 | * wait for request slots on the block side. | |
6314 | */ | |
6315 | if (ret != -EAGAIN) | |
6316 | break; | |
6317 | cond_resched(); | |
6318 | } while (1); | |
6319 | } | |
31b51510 | 6320 | |
a3df7698 | 6321 | /* avoid locking problems by failing it from a clean context */ |
561fb04a | 6322 | if (ret) { |
a3df7698 | 6323 | /* io-wq is going to take one down */ |
de9b4cca | 6324 | req_ref_get(req); |
a3df7698 | 6325 | io_req_task_queue_fail(req, ret); |
edafccee | 6326 | } |
2b188cc1 JA |
6327 | } |
6328 | ||
aeca241b | 6329 | static inline struct io_fixed_file *io_fixed_file_slot(struct io_file_table *table, |
042b0d85 | 6330 | unsigned i) |
65e19f54 | 6331 | { |
042b0d85 | 6332 | return &table->files[i]; |
dafecf19 PB |
6333 | } |
6334 | ||
65e19f54 JA |
6335 | static inline struct file *io_file_from_index(struct io_ring_ctx *ctx, |
6336 | int index) | |
6337 | { | |
aeca241b | 6338 | struct io_fixed_file *slot = io_fixed_file_slot(&ctx->file_table, index); |
65e19f54 | 6339 | |
a04b0ac0 | 6340 | return (struct file *) (slot->file_ptr & FFS_MASK); |
65e19f54 JA |
6341 | } |
6342 | ||
a04b0ac0 | 6343 | static void io_fixed_file_set(struct io_fixed_file *file_slot, struct file *file) |
9a321c98 PB |
6344 | { |
6345 | unsigned long file_ptr = (unsigned long) file; | |
6346 | ||
b191e2df | 6347 | if (__io_file_supports_nowait(file, READ)) |
9a321c98 | 6348 | file_ptr |= FFS_ASYNC_READ; |
b191e2df | 6349 | if (__io_file_supports_nowait(file, WRITE)) |
9a321c98 PB |
6350 | file_ptr |= FFS_ASYNC_WRITE; |
6351 | if (S_ISREG(file_inode(file)->i_mode)) | |
6352 | file_ptr |= FFS_ISREG; | |
a04b0ac0 | 6353 | file_slot->file_ptr = file_ptr; |
65e19f54 JA |
6354 | } |
6355 | ||
ac177053 PB |
6356 | static inline struct file *io_file_get_fixed(struct io_ring_ctx *ctx, |
6357 | struct io_kiocb *req, int fd) | |
09bb8394 | 6358 | { |
8da11c19 | 6359 | struct file *file; |
ac177053 | 6360 | unsigned long file_ptr; |
09bb8394 | 6361 | |
ac177053 PB |
6362 | if (unlikely((unsigned int)fd >= ctx->nr_user_files)) |
6363 | return NULL; | |
6364 | fd = array_index_nospec(fd, ctx->nr_user_files); | |
6365 | file_ptr = io_fixed_file_slot(&ctx->file_table, fd)->file_ptr; | |
6366 | file = (struct file *) (file_ptr & FFS_MASK); | |
6367 | file_ptr &= ~FFS_MASK; | |
6368 | /* mask in overlapping REQ_F and FFS bits */ | |
b191e2df | 6369 | req->flags |= (file_ptr << REQ_F_NOWAIT_READ_BIT); |
ac177053 PB |
6370 | io_req_set_rsrc_node(req); |
6371 | return file; | |
6372 | } | |
d44f554e | 6373 | |
ac177053 PB |
6374 | static struct file *io_file_get_normal(struct io_ring_ctx *ctx, |
6375 | struct io_submit_state *state, | |
6376 | struct io_kiocb *req, int fd) | |
6377 | { | |
6378 | struct file *file = __io_file_get(state, fd); | |
6379 | ||
6380 | trace_io_uring_file_get(ctx, fd); | |
09bb8394 | 6381 | |
ac177053 PB |
6382 | /* we don't allow fixed io_uring files */ |
6383 | if (file && unlikely(file->f_op == &io_uring_fops)) | |
6384 | io_req_track_inflight(req); | |
8371adf5 | 6385 | return file; |
09bb8394 JA |
6386 | } |
6387 | ||
ac177053 PB |
6388 | static inline struct file *io_file_get(struct io_ring_ctx *ctx, |
6389 | struct io_submit_state *state, | |
6390 | struct io_kiocb *req, int fd, bool fixed) | |
6391 | { | |
6392 | if (fixed) | |
6393 | return io_file_get_fixed(ctx, req, fd); | |
6394 | else | |
6395 | return io_file_get_normal(ctx, state, req, fd); | |
6396 | } | |
6397 | ||
2665abfd | 6398 | static enum hrtimer_restart io_link_timeout_fn(struct hrtimer *timer) |
2b188cc1 | 6399 | { |
ad8a48ac JA |
6400 | struct io_timeout_data *data = container_of(timer, |
6401 | struct io_timeout_data, timer); | |
90cd7e42 | 6402 | struct io_kiocb *prev, *req = data->req; |
2665abfd | 6403 | struct io_ring_ctx *ctx = req->ctx; |
2665abfd | 6404 | unsigned long flags; |
2665abfd JA |
6405 | |
6406 | spin_lock_irqsave(&ctx->completion_lock, flags); | |
90cd7e42 PB |
6407 | prev = req->timeout.head; |
6408 | req->timeout.head = NULL; | |
2665abfd JA |
6409 | |
6410 | /* | |
6411 | * We don't expect the list to be empty, that will only happen if we | |
6412 | * race with the completion of the linked work. | |
6413 | */ | |
447c19f3 | 6414 | if (prev) { |
f2f87370 | 6415 | io_remove_next_linked(prev); |
447c19f3 PB |
6416 | if (!req_ref_inc_not_zero(prev)) |
6417 | prev = NULL; | |
6418 | } | |
2665abfd JA |
6419 | spin_unlock_irqrestore(&ctx->completion_lock, flags); |
6420 | ||
6421 | if (prev) { | |
014db007 | 6422 | io_async_find_and_cancel(ctx, req, prev->user_data, -ETIME); |
9ae1f8dd | 6423 | io_put_req_deferred(prev, 1); |
a298232e | 6424 | io_put_req_deferred(req, 1); |
47f46768 | 6425 | } else { |
9ae1f8dd | 6426 | io_req_complete_post(req, -ETIME, 0); |
2665abfd | 6427 | } |
2665abfd JA |
6428 | return HRTIMER_NORESTART; |
6429 | } | |
6430 | ||
de968c18 | 6431 | static void io_queue_linked_timeout(struct io_kiocb *req) |
2665abfd | 6432 | { |
de968c18 PB |
6433 | struct io_ring_ctx *ctx = req->ctx; |
6434 | ||
6435 | spin_lock_irq(&ctx->completion_lock); | |
76a46e06 | 6436 | /* |
f2f87370 PB |
6437 | * If the back reference is NULL, then our linked request finished |
6438 | * before we got a chance to setup the timer | |
76a46e06 | 6439 | */ |
90cd7e42 | 6440 | if (req->timeout.head) { |
e8c2bc1f | 6441 | struct io_timeout_data *data = req->async_data; |
94ae5e77 | 6442 | |
ad8a48ac JA |
6443 | data->timer.function = io_link_timeout_fn; |
6444 | hrtimer_start(&data->timer, timespec64_to_ktime(data->ts), | |
6445 | data->mode); | |
2665abfd | 6446 | } |
76a46e06 | 6447 | spin_unlock_irq(&ctx->completion_lock); |
2665abfd | 6448 | /* drop submission reference */ |
76a46e06 JA |
6449 | io_put_req(req); |
6450 | } | |
2665abfd | 6451 | |
ad8a48ac | 6452 | static struct io_kiocb *io_prep_linked_timeout(struct io_kiocb *req) |
2665abfd | 6453 | { |
f2f87370 | 6454 | struct io_kiocb *nxt = req->link; |
2665abfd | 6455 | |
f2f87370 PB |
6456 | if (!nxt || (req->flags & REQ_F_LINK_TIMEOUT) || |
6457 | nxt->opcode != IORING_OP_LINK_TIMEOUT) | |
76a46e06 | 6458 | return NULL; |
2665abfd | 6459 | |
90cd7e42 | 6460 | nxt->timeout.head = req; |
900fad45 | 6461 | nxt->flags |= REQ_F_LTIMEOUT_ACTIVE; |
76a46e06 | 6462 | req->flags |= REQ_F_LINK_TIMEOUT; |
76a46e06 | 6463 | return nxt; |
2665abfd JA |
6464 | } |
6465 | ||
c5eef2b9 | 6466 | static void __io_queue_sqe(struct io_kiocb *req) |
282cdc86 | 6467 | __must_hold(&req->ctx->uring_lock) |
2b188cc1 | 6468 | { |
d3d7298d | 6469 | struct io_kiocb *linked_timeout = io_prep_linked_timeout(req); |
e0c5c576 | 6470 | int ret; |
2b188cc1 | 6471 | |
59b735ae | 6472 | issue_sqe: |
c5eef2b9 | 6473 | ret = io_issue_sqe(req, IO_URING_F_NONBLOCK|IO_URING_F_COMPLETE_DEFER); |
193155c8 | 6474 | |
491381ce JA |
6475 | /* |
6476 | * We async punt it if the file wasn't marked NOWAIT, or if the file | |
6477 | * doesn't support non-blocking read/write attempts | |
6478 | */ | |
1840038e | 6479 | if (likely(!ret)) { |
0d63c148 | 6480 | /* drop submission reference */ |
e342c807 | 6481 | if (req->flags & REQ_F_COMPLETE_INLINE) { |
c5eef2b9 PB |
6482 | struct io_ring_ctx *ctx = req->ctx; |
6483 | struct io_comp_state *cs = &ctx->submit_state.comp; | |
e65ef56d | 6484 | |
6dd0be1e | 6485 | cs->reqs[cs->nr++] = req; |
d3d7298d | 6486 | if (cs->nr == ARRAY_SIZE(cs->reqs)) |
2a2758f2 | 6487 | io_submit_flush_completions(ctx); |
9affd664 | 6488 | } else { |
d3d7298d | 6489 | io_put_req(req); |
0d63c148 | 6490 | } |
1840038e | 6491 | } else if (ret == -EAGAIN && !(req->flags & REQ_F_NOWAIT)) { |
59b735ae OL |
6492 | switch (io_arm_poll_handler(req)) { |
6493 | case IO_APOLL_READY: | |
6494 | goto issue_sqe; | |
6495 | case IO_APOLL_ABORTED: | |
1840038e PB |
6496 | /* |
6497 | * Queued up for async execution, worker will release | |
6498 | * submit reference when the iocb is actually submitted. | |
6499 | */ | |
6500 | io_queue_async_work(req); | |
59b735ae | 6501 | break; |
1840038e | 6502 | } |
0d63c148 | 6503 | } else { |
f41db273 | 6504 | io_req_complete_failed(req, ret); |
9e645e11 | 6505 | } |
d3d7298d PB |
6506 | if (linked_timeout) |
6507 | io_queue_linked_timeout(linked_timeout); | |
2b188cc1 JA |
6508 | } |
6509 | ||
441b8a78 | 6510 | static inline void io_queue_sqe(struct io_kiocb *req) |
282cdc86 | 6511 | __must_hold(&req->ctx->uring_lock) |
4fe2c963 | 6512 | { |
10c66904 | 6513 | if (unlikely(req->ctx->drain_active) && io_drain_req(req)) |
76cc33d7 | 6514 | return; |
4fe2c963 | 6515 | |
76cc33d7 | 6516 | if (likely(!(req->flags & REQ_F_FORCE_ASYNC))) { |
c5eef2b9 | 6517 | __io_queue_sqe(req); |
76cc33d7 PB |
6518 | } else { |
6519 | int ret = io_req_prep_async(req); | |
6520 | ||
6521 | if (unlikely(ret)) | |
6522 | io_req_complete_failed(req, ret); | |
6523 | else | |
6524 | io_queue_async_work(req); | |
ce35a47a | 6525 | } |
4fe2c963 JL |
6526 | } |
6527 | ||
b16fed66 PB |
6528 | /* |
6529 | * Check SQE restrictions (opcode and flags). | |
6530 | * | |
6531 | * Returns 'true' if SQE is allowed, 'false' otherwise. | |
6532 | */ | |
6533 | static inline bool io_check_restriction(struct io_ring_ctx *ctx, | |
6534 | struct io_kiocb *req, | |
6535 | unsigned int sqe_flags) | |
4fe2c963 | 6536 | { |
4cfb25bf | 6537 | if (likely(!ctx->restricted)) |
b16fed66 PB |
6538 | return true; |
6539 | ||
6540 | if (!test_bit(req->opcode, ctx->restrictions.sqe_op)) | |
6541 | return false; | |
6542 | ||
6543 | if ((sqe_flags & ctx->restrictions.sqe_flags_required) != | |
6544 | ctx->restrictions.sqe_flags_required) | |
6545 | return false; | |
6546 | ||
6547 | if (sqe_flags & ~(ctx->restrictions.sqe_flags_allowed | | |
6548 | ctx->restrictions.sqe_flags_required)) | |
6549 | return false; | |
6550 | ||
6551 | return true; | |
4fe2c963 JL |
6552 | } |
6553 | ||
b16fed66 PB |
6554 | static int io_init_req(struct io_ring_ctx *ctx, struct io_kiocb *req, |
6555 | const struct io_uring_sqe *sqe) | |
282cdc86 | 6556 | __must_hold(&ctx->uring_lock) |
b16fed66 PB |
6557 | { |
6558 | struct io_submit_state *state; | |
6559 | unsigned int sqe_flags; | |
003e8dcc | 6560 | int personality, ret = 0; |
b16fed66 | 6561 | |
864ea921 | 6562 | /* req is partially pre-initialised, see io_preinit_req() */ |
b16fed66 PB |
6563 | req->opcode = READ_ONCE(sqe->opcode); |
6564 | /* same numerical values with corresponding REQ_F_*, safe to copy */ | |
6565 | req->flags = sqe_flags = READ_ONCE(sqe->flags); | |
6566 | req->user_data = READ_ONCE(sqe->user_data); | |
b16fed66 | 6567 | req->file = NULL; |
b16fed66 PB |
6568 | req->fixed_rsrc_refs = NULL; |
6569 | /* one is dropped after submission, the other at completion */ | |
abc54d63 | 6570 | atomic_set(&req->refs, 2); |
b16fed66 | 6571 | req->task = current; |
b16fed66 PB |
6572 | |
6573 | /* enforce forwards compatibility on users */ | |
dddca226 | 6574 | if (unlikely(sqe_flags & ~SQE_VALID_FLAGS)) |
b16fed66 | 6575 | return -EINVAL; |
b16fed66 PB |
6576 | if (unlikely(req->opcode >= IORING_OP_LAST)) |
6577 | return -EINVAL; | |
4cfb25bf | 6578 | if (!io_check_restriction(ctx, req, sqe_flags)) |
b16fed66 PB |
6579 | return -EACCES; |
6580 | ||
6581 | if ((sqe_flags & IOSQE_BUFFER_SELECT) && | |
6582 | !io_op_defs[req->opcode].buffer_select) | |
6583 | return -EOPNOTSUPP; | |
3c19966d PB |
6584 | if (unlikely(sqe_flags & IOSQE_IO_DRAIN)) |
6585 | ctx->drain_active = true; | |
863e0560 | 6586 | |
003e8dcc JA |
6587 | personality = READ_ONCE(sqe->personality); |
6588 | if (personality) { | |
c10d1f98 PB |
6589 | req->creds = xa_load(&ctx->personalities, personality); |
6590 | if (!req->creds) | |
003e8dcc | 6591 | return -EINVAL; |
c10d1f98 | 6592 | get_cred(req->creds); |
b8e64b53 | 6593 | req->flags |= REQ_F_CREDS; |
003e8dcc | 6594 | } |
b16fed66 PB |
6595 | state = &ctx->submit_state; |
6596 | ||
6597 | /* | |
6598 | * Plug now if we have more than 1 IO left after this, and the target | |
6599 | * is potentially a read/write to block based storage. | |
6600 | */ | |
6601 | if (!state->plug_started && state->ios_left > 1 && | |
6602 | io_op_defs[req->opcode].plug) { | |
6603 | blk_start_plug(&state->plug); | |
6604 | state->plug_started = true; | |
6605 | } | |
6606 | ||
6607 | if (io_op_defs[req->opcode].needs_file) { | |
ac177053 PB |
6608 | req->file = io_file_get(ctx, state, req, READ_ONCE(sqe->fd), |
6609 | (sqe_flags & IOSQE_FIXED_FILE)); | |
b16fed66 PB |
6610 | if (unlikely(!req->file)) |
6611 | ret = -EBADF; | |
6612 | } | |
6613 | ||
6614 | state->ios_left--; | |
6615 | return ret; | |
6616 | } | |
6617 | ||
a6b8cadc | 6618 | static int io_submit_sqe(struct io_ring_ctx *ctx, struct io_kiocb *req, |
a1ab7b35 | 6619 | const struct io_uring_sqe *sqe) |
282cdc86 | 6620 | __must_hold(&ctx->uring_lock) |
9e645e11 | 6621 | { |
a1ab7b35 | 6622 | struct io_submit_link *link = &ctx->submit_state.link; |
ef4ff581 | 6623 | int ret; |
9e645e11 | 6624 | |
a6b8cadc PB |
6625 | ret = io_init_req(ctx, req, sqe); |
6626 | if (unlikely(ret)) { | |
6627 | fail_req: | |
de59bc10 PB |
6628 | if (link->head) { |
6629 | /* fail even hard links since we don't submit */ | |
93d2bcd2 | 6630 | req_set_fail(link->head); |
f41db273 | 6631 | io_req_complete_failed(link->head, -ECANCELED); |
de59bc10 PB |
6632 | link->head = NULL; |
6633 | } | |
f41db273 | 6634 | io_req_complete_failed(req, ret); |
a6b8cadc PB |
6635 | return ret; |
6636 | } | |
441b8a78 | 6637 | |
be7053b7 PB |
6638 | ret = io_req_prep(req, sqe); |
6639 | if (unlikely(ret)) | |
6640 | goto fail_req; | |
a6b8cadc | 6641 | |
be7053b7 | 6642 | /* don't need @sqe from now on */ |
236daeae OL |
6643 | trace_io_uring_submit_sqe(ctx, req, req->opcode, req->user_data, |
6644 | req->flags, true, | |
6645 | ctx->flags & IORING_SETUP_SQPOLL); | |
a6b8cadc | 6646 | |
9e645e11 JA |
6647 | /* |
6648 | * If we already have a head request, queue this one for async | |
6649 | * submittal once the head completes. If we don't have a head but | |
6650 | * IOSQE_IO_LINK is set in the sqe, start a new head. This one will be | |
6651 | * submitted sync once the chain is complete. If none of those | |
6652 | * conditions are true (normal request), then just queue it. | |
6653 | */ | |
863e0560 PB |
6654 | if (link->head) { |
6655 | struct io_kiocb *head = link->head; | |
4e88d6e7 | 6656 | |
b7e298d2 | 6657 | ret = io_req_prep_async(req); |
cf109604 | 6658 | if (unlikely(ret)) |
a6b8cadc | 6659 | goto fail_req; |
9d76377f | 6660 | trace_io_uring_link(ctx, req, head); |
f2f87370 | 6661 | link->last->link = req; |
863e0560 | 6662 | link->last = req; |
32fe525b PB |
6663 | |
6664 | /* last request of a link, enqueue the link */ | |
ef4ff581 | 6665 | if (!(req->flags & (REQ_F_LINK | REQ_F_HARDLINK))) { |
863e0560 | 6666 | link->head = NULL; |
5e159204 | 6667 | io_queue_sqe(head); |
32fe525b | 6668 | } |
9e645e11 | 6669 | } else { |
ef4ff581 | 6670 | if (req->flags & (REQ_F_LINK | REQ_F_HARDLINK)) { |
863e0560 PB |
6671 | link->head = req; |
6672 | link->last = req; | |
711be031 | 6673 | } else { |
be7053b7 | 6674 | io_queue_sqe(req); |
711be031 | 6675 | } |
9e645e11 | 6676 | } |
2e6e1fde | 6677 | |
1d4240cc | 6678 | return 0; |
9e645e11 JA |
6679 | } |
6680 | ||
9a56a232 JA |
6681 | /* |
6682 | * Batched submission is done, ensure local IO is flushed out. | |
6683 | */ | |
ba88ff11 PB |
6684 | static void io_submit_state_end(struct io_submit_state *state, |
6685 | struct io_ring_ctx *ctx) | |
9a56a232 | 6686 | { |
a1ab7b35 | 6687 | if (state->link.head) |
de59bc10 | 6688 | io_queue_sqe(state->link.head); |
6dd0be1e | 6689 | if (state->comp.nr) |
2a2758f2 | 6690 | io_submit_flush_completions(ctx); |
27926b68 JA |
6691 | if (state->plug_started) |
6692 | blk_finish_plug(&state->plug); | |
9f13c35b | 6693 | io_state_file_put(state); |
9a56a232 JA |
6694 | } |
6695 | ||
6696 | /* | |
6697 | * Start submission side cache. | |
6698 | */ | |
6699 | static void io_submit_state_start(struct io_submit_state *state, | |
ba88ff11 | 6700 | unsigned int max_ios) |
9a56a232 | 6701 | { |
27926b68 | 6702 | state->plug_started = false; |
9a56a232 | 6703 | state->ios_left = max_ios; |
a1ab7b35 PB |
6704 | /* set only head, no need to init link_last in advance */ |
6705 | state->link.head = NULL; | |
9a56a232 JA |
6706 | } |
6707 | ||
2b188cc1 JA |
6708 | static void io_commit_sqring(struct io_ring_ctx *ctx) |
6709 | { | |
75b28aff | 6710 | struct io_rings *rings = ctx->rings; |
2b188cc1 | 6711 | |
caf582c6 PB |
6712 | /* |
6713 | * Ensure any loads from the SQEs are done at this point, | |
6714 | * since once we write the new head, the application could | |
6715 | * write new data to them. | |
6716 | */ | |
6717 | smp_store_release(&rings->sq.head, ctx->cached_sq_head); | |
2b188cc1 JA |
6718 | } |
6719 | ||
2b188cc1 | 6720 | /* |
dd9ae8a0 | 6721 | * Fetch an sqe, if one is available. Note this returns a pointer to memory |
2b188cc1 JA |
6722 | * that is mapped by userspace. This means that care needs to be taken to |
6723 | * ensure that reads are stable, as we cannot rely on userspace always | |
6724 | * being a good citizen. If members of the sqe are validated and then later | |
6725 | * used, it's important that those reads are done through READ_ONCE() to | |
6726 | * prevent a re-load down the line. | |
6727 | */ | |
709b302f | 6728 | static const struct io_uring_sqe *io_get_sqe(struct io_ring_ctx *ctx) |
2b188cc1 | 6729 | { |
ea5ab3b5 | 6730 | unsigned head, mask = ctx->sq_entries - 1; |
17d3aeb3 | 6731 | unsigned sq_idx = ctx->cached_sq_head++ & mask; |
2b188cc1 JA |
6732 | |
6733 | /* | |
6734 | * The cached sq head (or cq tail) serves two purposes: | |
6735 | * | |
6736 | * 1) allows us to batch the cost of updating the user visible | |
6737 | * head updates. | |
6738 | * 2) allows the kernel side to track the head on its own, even | |
6739 | * though the application is the one updating it. | |
6740 | */ | |
17d3aeb3 | 6741 | head = READ_ONCE(ctx->sq_array[sq_idx]); |
709b302f PB |
6742 | if (likely(head < ctx->sq_entries)) |
6743 | return &ctx->sq_sqes[head]; | |
2b188cc1 JA |
6744 | |
6745 | /* drop invalid entries */ | |
15641e42 PB |
6746 | ctx->cq_extra--; |
6747 | WRITE_ONCE(ctx->rings->sq_dropped, | |
6748 | READ_ONCE(ctx->rings->sq_dropped) + 1); | |
709b302f PB |
6749 | return NULL; |
6750 | } | |
6751 | ||
0f212204 | 6752 | static int io_submit_sqes(struct io_ring_ctx *ctx, unsigned int nr) |
282cdc86 | 6753 | __must_hold(&ctx->uring_lock) |
6c271ce2 | 6754 | { |
09899b19 | 6755 | struct io_uring_task *tctx; |
46c4e16a | 6756 | int submitted = 0; |
6c271ce2 | 6757 | |
ee7d46d9 PB |
6758 | /* make sure SQ entry isn't read before tail */ |
6759 | nr = min3(nr, ctx->sq_entries, io_sqring_entries(ctx)); | |
2b85edfc PB |
6760 | if (!percpu_ref_tryget_many(&ctx->refs, nr)) |
6761 | return -EAGAIN; | |
6c271ce2 | 6762 | |
09899b19 PB |
6763 | tctx = current->io_uring; |
6764 | tctx->cached_refs -= nr; | |
6765 | if (unlikely(tctx->cached_refs < 0)) { | |
6766 | unsigned int refill = -tctx->cached_refs + IO_TCTX_REFS_CACHE_NR; | |
6767 | ||
6768 | percpu_counter_add(&tctx->inflight, refill); | |
6769 | refcount_add(refill, ¤t->usage); | |
6770 | tctx->cached_refs += refill; | |
6771 | } | |
ba88ff11 | 6772 | io_submit_state_start(&ctx->submit_state, nr); |
b14cca0c | 6773 | |
46c4e16a | 6774 | while (submitted < nr) { |
3529d8c2 | 6775 | const struct io_uring_sqe *sqe; |
196be95c | 6776 | struct io_kiocb *req; |
fb5ccc98 | 6777 | |
258b29a9 | 6778 | req = io_alloc_req(ctx); |
196be95c PB |
6779 | if (unlikely(!req)) { |
6780 | if (!submitted) | |
6781 | submitted = -EAGAIN; | |
fb5ccc98 | 6782 | break; |
196be95c | 6783 | } |
4fccfcbb PB |
6784 | sqe = io_get_sqe(ctx); |
6785 | if (unlikely(!sqe)) { | |
6786 | kmem_cache_free(req_cachep, req); | |
6787 | break; | |
6788 | } | |
d3656344 JA |
6789 | /* will complete beyond this point, count as submitted */ |
6790 | submitted++; | |
a1ab7b35 | 6791 | if (io_submit_sqe(ctx, req, sqe)) |
196be95c | 6792 | break; |
6c271ce2 JA |
6793 | } |
6794 | ||
9466f437 PB |
6795 | if (unlikely(submitted != nr)) { |
6796 | int ref_used = (submitted == -EAGAIN) ? 0 : submitted; | |
d8a6df10 | 6797 | int unused = nr - ref_used; |
9466f437 | 6798 | |
09899b19 | 6799 | current->io_uring->cached_refs += unused; |
d8a6df10 | 6800 | percpu_ref_put_many(&ctx->refs, unused); |
9466f437 | 6801 | } |
6c271ce2 | 6802 | |
a1ab7b35 | 6803 | io_submit_state_end(&ctx->submit_state, ctx); |
ae9428ca PB |
6804 | /* Commit SQ ring head once we've consumed and submitted all SQEs */ |
6805 | io_commit_sqring(ctx); | |
6806 | ||
6c271ce2 JA |
6807 | return submitted; |
6808 | } | |
6809 | ||
e4b6d902 PB |
6810 | static inline bool io_sqd_events_pending(struct io_sq_data *sqd) |
6811 | { | |
6812 | return READ_ONCE(sqd->state); | |
6813 | } | |
6814 | ||
23b3628e XW |
6815 | static inline void io_ring_set_wakeup_flag(struct io_ring_ctx *ctx) |
6816 | { | |
6817 | /* Tell userspace we may need a wakeup call */ | |
6818 | spin_lock_irq(&ctx->completion_lock); | |
20c0b380 NA |
6819 | WRITE_ONCE(ctx->rings->sq_flags, |
6820 | ctx->rings->sq_flags | IORING_SQ_NEED_WAKEUP); | |
23b3628e XW |
6821 | spin_unlock_irq(&ctx->completion_lock); |
6822 | } | |
6823 | ||
6824 | static inline void io_ring_clear_wakeup_flag(struct io_ring_ctx *ctx) | |
6825 | { | |
6826 | spin_lock_irq(&ctx->completion_lock); | |
20c0b380 NA |
6827 | WRITE_ONCE(ctx->rings->sq_flags, |
6828 | ctx->rings->sq_flags & ~IORING_SQ_NEED_WAKEUP); | |
23b3628e XW |
6829 | spin_unlock_irq(&ctx->completion_lock); |
6830 | } | |
6831 | ||
08369246 | 6832 | static int __io_sq_thread(struct io_ring_ctx *ctx, bool cap_entries) |
6c271ce2 | 6833 | { |
c8d1ba58 | 6834 | unsigned int to_submit; |
bdcd3eab | 6835 | int ret = 0; |
6c271ce2 | 6836 | |
c8d1ba58 | 6837 | to_submit = io_sqring_entries(ctx); |
e95eee2d | 6838 | /* if we're handling multiple rings, cap submit size for fairness */ |
4ce8ad95 OL |
6839 | if (cap_entries && to_submit > IORING_SQPOLL_CAP_ENTRIES_VALUE) |
6840 | to_submit = IORING_SQPOLL_CAP_ENTRIES_VALUE; | |
e95eee2d | 6841 | |
906a3c6f | 6842 | if (!list_empty(&ctx->iopoll_list) || to_submit) { |
c8d1ba58 | 6843 | unsigned nr_events = 0; |
948e1947 PB |
6844 | const struct cred *creds = NULL; |
6845 | ||
6846 | if (ctx->sq_creds != current_cred()) | |
6847 | creds = override_creds(ctx->sq_creds); | |
a4c0b3de | 6848 | |
c8d1ba58 | 6849 | mutex_lock(&ctx->uring_lock); |
906a3c6f | 6850 | if (!list_empty(&ctx->iopoll_list)) |
3c30ef0f | 6851 | io_do_iopoll(ctx, &nr_events, 0, true); |
906a3c6f | 6852 | |
3b763ba1 PB |
6853 | /* |
6854 | * Don't submit if refs are dying, good for io_uring_register(), | |
6855 | * but also it is relied upon by io_ring_exit_work() | |
6856 | */ | |
0298ef96 PB |
6857 | if (to_submit && likely(!percpu_ref_is_dying(&ctx->refs)) && |
6858 | !(ctx->flags & IORING_SETUP_R_DISABLED)) | |
08369246 | 6859 | ret = io_submit_sqes(ctx, to_submit); |
c8d1ba58 | 6860 | mutex_unlock(&ctx->uring_lock); |
6c271ce2 | 6861 | |
acfb381d PB |
6862 | if (to_submit && wq_has_sleeper(&ctx->sqo_sq_wait)) |
6863 | wake_up(&ctx->sqo_sq_wait); | |
948e1947 PB |
6864 | if (creds) |
6865 | revert_creds(creds); | |
acfb381d | 6866 | } |
6c271ce2 | 6867 | |
08369246 XW |
6868 | return ret; |
6869 | } | |
6c271ce2 | 6870 | |
08369246 XW |
6871 | static void io_sqd_update_thread_idle(struct io_sq_data *sqd) |
6872 | { | |
6873 | struct io_ring_ctx *ctx; | |
6874 | unsigned sq_thread_idle = 0; | |
6c271ce2 | 6875 | |
c9dca27d PB |
6876 | list_for_each_entry(ctx, &sqd->ctx_list, sqd_list) |
6877 | sq_thread_idle = max(sq_thread_idle, ctx->sq_thread_idle); | |
08369246 | 6878 | sqd->sq_thread_idle = sq_thread_idle; |
c8d1ba58 | 6879 | } |
6c271ce2 | 6880 | |
e4b6d902 PB |
6881 | static bool io_sqd_handle_event(struct io_sq_data *sqd) |
6882 | { | |
6883 | bool did_sig = false; | |
6884 | struct ksignal ksig; | |
6885 | ||
6886 | if (test_bit(IO_SQ_THREAD_SHOULD_PARK, &sqd->state) || | |
6887 | signal_pending(current)) { | |
6888 | mutex_unlock(&sqd->lock); | |
6889 | if (signal_pending(current)) | |
6890 | did_sig = get_signal(&ksig); | |
6891 | cond_resched(); | |
6892 | mutex_lock(&sqd->lock); | |
6893 | } | |
e4b6d902 PB |
6894 | return did_sig || test_bit(IO_SQ_THREAD_SHOULD_STOP, &sqd->state); |
6895 | } | |
6896 | ||
c8d1ba58 JA |
6897 | static int io_sq_thread(void *data) |
6898 | { | |
69fb2131 JA |
6899 | struct io_sq_data *sqd = data; |
6900 | struct io_ring_ctx *ctx; | |
a0d9205f | 6901 | unsigned long timeout = 0; |
37d1e2e3 | 6902 | char buf[TASK_COMM_LEN]; |
08369246 | 6903 | DEFINE_WAIT(wait); |
6c271ce2 | 6904 | |
696ee88a | 6905 | snprintf(buf, sizeof(buf), "iou-sqp-%d", sqd->task_pid); |
37d1e2e3 | 6906 | set_task_comm(current, buf); |
37d1e2e3 JA |
6907 | |
6908 | if (sqd->sq_cpu != -1) | |
6909 | set_cpus_allowed_ptr(current, cpumask_of(sqd->sq_cpu)); | |
6910 | else | |
6911 | set_cpus_allowed_ptr(current, cpu_online_mask); | |
6912 | current->flags |= PF_NO_SETAFFINITY; | |
6913 | ||
09a6f4ef | 6914 | mutex_lock(&sqd->lock); |
e4b6d902 | 6915 | while (1) { |
1a924a80 | 6916 | bool cap_entries, sqt_spin = false; |
c1edbf5f | 6917 | |
e4b6d902 PB |
6918 | if (io_sqd_events_pending(sqd) || signal_pending(current)) { |
6919 | if (io_sqd_handle_event(sqd)) | |
c7d95613 | 6920 | break; |
08369246 XW |
6921 | timeout = jiffies + sqd->sq_thread_idle; |
6922 | } | |
e4b6d902 | 6923 | |
e95eee2d | 6924 | cap_entries = !list_is_singular(&sqd->ctx_list); |
69fb2131 | 6925 | list_for_each_entry(ctx, &sqd->ctx_list, sqd_list) { |
948e1947 | 6926 | int ret = __io_sq_thread(ctx, cap_entries); |
7c30f36a | 6927 | |
08369246 XW |
6928 | if (!sqt_spin && (ret > 0 || !list_empty(&ctx->iopoll_list))) |
6929 | sqt_spin = true; | |
69fb2131 | 6930 | } |
dd432ea5 PB |
6931 | if (io_run_task_work()) |
6932 | sqt_spin = true; | |
6c271ce2 | 6933 | |
08369246 | 6934 | if (sqt_spin || !time_after(jiffies, timeout)) { |
c8d1ba58 | 6935 | cond_resched(); |
08369246 XW |
6936 | if (sqt_spin) |
6937 | timeout = jiffies + sqd->sq_thread_idle; | |
6938 | continue; | |
6939 | } | |
6940 | ||
08369246 | 6941 | prepare_to_wait(&sqd->wait, &wait, TASK_INTERRUPTIBLE); |
dd432ea5 | 6942 | if (!io_sqd_events_pending(sqd) && !current->task_works) { |
1a924a80 PB |
6943 | bool needs_sched = true; |
6944 | ||
724cb4f9 | 6945 | list_for_each_entry(ctx, &sqd->ctx_list, sqd_list) { |
aaa9f0f4 PB |
6946 | io_ring_set_wakeup_flag(ctx); |
6947 | ||
724cb4f9 HX |
6948 | if ((ctx->flags & IORING_SETUP_IOPOLL) && |
6949 | !list_empty_careful(&ctx->iopoll_list)) { | |
6950 | needs_sched = false; | |
6951 | break; | |
6952 | } | |
6953 | if (io_sqring_entries(ctx)) { | |
6954 | needs_sched = false; | |
6955 | break; | |
6956 | } | |
6957 | } | |
6958 | ||
6959 | if (needs_sched) { | |
6960 | mutex_unlock(&sqd->lock); | |
6961 | schedule(); | |
6962 | mutex_lock(&sqd->lock); | |
6963 | } | |
69fb2131 JA |
6964 | list_for_each_entry(ctx, &sqd->ctx_list, sqd_list) |
6965 | io_ring_clear_wakeup_flag(ctx); | |
6c271ce2 | 6966 | } |
08369246 XW |
6967 | |
6968 | finish_wait(&sqd->wait, &wait); | |
6969 | timeout = jiffies + sqd->sq_thread_idle; | |
6c271ce2 | 6970 | } |
28cea78a | 6971 | |
78cc687b | 6972 | io_uring_cancel_generic(true, sqd); |
37d1e2e3 | 6973 | sqd->thread = NULL; |
05962f95 | 6974 | list_for_each_entry(ctx, &sqd->ctx_list, sqd_list) |
5f3f26f9 | 6975 | io_ring_set_wakeup_flag(ctx); |
521d6a73 | 6976 | io_run_task_work(); |
734551df PB |
6977 | mutex_unlock(&sqd->lock); |
6978 | ||
37d1e2e3 JA |
6979 | complete(&sqd->exited); |
6980 | do_exit(0); | |
6c271ce2 JA |
6981 | } |
6982 | ||
bda52162 JA |
6983 | struct io_wait_queue { |
6984 | struct wait_queue_entry wq; | |
6985 | struct io_ring_ctx *ctx; | |
5fd46178 | 6986 | unsigned cq_tail; |
bda52162 JA |
6987 | unsigned nr_timeouts; |
6988 | }; | |
6989 | ||
6c503150 | 6990 | static inline bool io_should_wake(struct io_wait_queue *iowq) |
bda52162 JA |
6991 | { |
6992 | struct io_ring_ctx *ctx = iowq->ctx; | |
5fd46178 | 6993 | int dist = ctx->cached_cq_tail - (int) iowq->cq_tail; |
bda52162 JA |
6994 | |
6995 | /* | |
d195a66e | 6996 | * Wake up if we have enough events, or if a timeout occurred since we |
bda52162 JA |
6997 | * started waiting. For timeouts, we always want to return to userspace, |
6998 | * regardless of event count. | |
6999 | */ | |
5fd46178 | 7000 | return dist >= 0 || atomic_read(&ctx->cq_timeouts) != iowq->nr_timeouts; |
bda52162 JA |
7001 | } |
7002 | ||
7003 | static int io_wake_function(struct wait_queue_entry *curr, unsigned int mode, | |
7004 | int wake_flags, void *key) | |
7005 | { | |
7006 | struct io_wait_queue *iowq = container_of(curr, struct io_wait_queue, | |
7007 | wq); | |
7008 | ||
6c503150 PB |
7009 | /* |
7010 | * Cannot safely flush overflowed CQEs from here, ensure we wake up | |
7011 | * the task, and the next invocation will do it. | |
7012 | */ | |
5ed7a37d | 7013 | if (io_should_wake(iowq) || test_bit(0, &iowq->ctx->check_cq_overflow)) |
6c503150 PB |
7014 | return autoremove_wake_function(curr, mode, wake_flags, key); |
7015 | return -1; | |
bda52162 JA |
7016 | } |
7017 | ||
af9c1a44 JA |
7018 | static int io_run_task_work_sig(void) |
7019 | { | |
7020 | if (io_run_task_work()) | |
7021 | return 1; | |
7022 | if (!signal_pending(current)) | |
7023 | return 0; | |
0b8cfa97 | 7024 | if (test_thread_flag(TIF_NOTIFY_SIGNAL)) |
792ee0f6 | 7025 | return -ERESTARTSYS; |
af9c1a44 JA |
7026 | return -EINTR; |
7027 | } | |
7028 | ||
eeb60b9a PB |
7029 | /* when returns >0, the caller should retry */ |
7030 | static inline int io_cqring_wait_schedule(struct io_ring_ctx *ctx, | |
7031 | struct io_wait_queue *iowq, | |
7032 | signed long *timeout) | |
7033 | { | |
7034 | int ret; | |
7035 | ||
7036 | /* make sure we run task_work before checking for signals */ | |
7037 | ret = io_run_task_work_sig(); | |
7038 | if (ret || io_should_wake(iowq)) | |
7039 | return ret; | |
7040 | /* let the caller flush overflows, retry */ | |
5ed7a37d | 7041 | if (test_bit(0, &ctx->check_cq_overflow)) |
eeb60b9a PB |
7042 | return 1; |
7043 | ||
7044 | *timeout = schedule_timeout(*timeout); | |
7045 | return !*timeout ? -ETIME : 1; | |
7046 | } | |
7047 | ||
2b188cc1 JA |
7048 | /* |
7049 | * Wait until events become available, if we don't already have some. The | |
7050 | * application must reap them itself, as they reside on the shared cq ring. | |
7051 | */ | |
7052 | static int io_cqring_wait(struct io_ring_ctx *ctx, int min_events, | |
c73ebb68 HX |
7053 | const sigset_t __user *sig, size_t sigsz, |
7054 | struct __kernel_timespec __user *uts) | |
2b188cc1 | 7055 | { |
90291099 | 7056 | struct io_wait_queue iowq; |
75b28aff | 7057 | struct io_rings *rings = ctx->rings; |
c1d5a224 PB |
7058 | signed long timeout = MAX_SCHEDULE_TIMEOUT; |
7059 | int ret; | |
2b188cc1 | 7060 | |
b41e9852 | 7061 | do { |
6c2450ae | 7062 | io_cqring_overflow_flush(ctx, false); |
6c503150 | 7063 | if (io_cqring_events(ctx) >= min_events) |
b41e9852 | 7064 | return 0; |
4c6e277c | 7065 | if (!io_run_task_work()) |
b41e9852 | 7066 | break; |
b41e9852 | 7067 | } while (1); |
2b188cc1 JA |
7068 | |
7069 | if (sig) { | |
9e75ad5d AB |
7070 | #ifdef CONFIG_COMPAT |
7071 | if (in_compat_syscall()) | |
7072 | ret = set_compat_user_sigmask((const compat_sigset_t __user *)sig, | |
b772434b | 7073 | sigsz); |
9e75ad5d AB |
7074 | else |
7075 | #endif | |
b772434b | 7076 | ret = set_user_sigmask(sig, sigsz); |
9e75ad5d | 7077 | |
2b188cc1 JA |
7078 | if (ret) |
7079 | return ret; | |
7080 | } | |
7081 | ||
c73ebb68 | 7082 | if (uts) { |
c1d5a224 PB |
7083 | struct timespec64 ts; |
7084 | ||
c73ebb68 HX |
7085 | if (get_timespec64(&ts, uts)) |
7086 | return -EFAULT; | |
7087 | timeout = timespec64_to_jiffies(&ts); | |
7088 | } | |
7089 | ||
90291099 PB |
7090 | init_waitqueue_func_entry(&iowq.wq, io_wake_function); |
7091 | iowq.wq.private = current; | |
7092 | INIT_LIST_HEAD(&iowq.wq.entry); | |
7093 | iowq.ctx = ctx; | |
bda52162 | 7094 | iowq.nr_timeouts = atomic_read(&ctx->cq_timeouts); |
5fd46178 | 7095 | iowq.cq_tail = READ_ONCE(ctx->rings->cq.head) + min_events; |
90291099 | 7096 | |
c826bd7a | 7097 | trace_io_uring_cqring_wait(ctx, min_events); |
bda52162 | 7098 | do { |
ca0a2651 | 7099 | /* if we can't even flush overflow, don't wait for more */ |
6c2450ae | 7100 | if (!io_cqring_overflow_flush(ctx, false)) { |
ca0a2651 JA |
7101 | ret = -EBUSY; |
7102 | break; | |
7103 | } | |
311997b3 | 7104 | prepare_to_wait_exclusive(&ctx->cq_wait, &iowq.wq, |
bda52162 | 7105 | TASK_INTERRUPTIBLE); |
eeb60b9a | 7106 | ret = io_cqring_wait_schedule(ctx, &iowq, &timeout); |
311997b3 | 7107 | finish_wait(&ctx->cq_wait, &iowq.wq); |
ca0a2651 | 7108 | cond_resched(); |
eeb60b9a | 7109 | } while (ret > 0); |
bda52162 | 7110 | |
b7db41c9 | 7111 | restore_saved_sigmask_unless(ret == -EINTR); |
2b188cc1 | 7112 | |
75b28aff | 7113 | return READ_ONCE(rings->cq.head) == READ_ONCE(rings->cq.tail) ? ret : 0; |
2b188cc1 JA |
7114 | } |
7115 | ||
9123c8ff | 7116 | static void io_free_page_table(void **table, size_t size) |
05f3fb3c | 7117 | { |
9123c8ff | 7118 | unsigned i, nr_tables = DIV_ROUND_UP(size, PAGE_SIZE); |
05f3fb3c | 7119 | |
846a4ef2 | 7120 | for (i = 0; i < nr_tables; i++) |
9123c8ff PB |
7121 | kfree(table[i]); |
7122 | kfree(table); | |
7123 | } | |
7124 | ||
7125 | static void **io_alloc_page_table(size_t size) | |
7126 | { | |
7127 | unsigned i, nr_tables = DIV_ROUND_UP(size, PAGE_SIZE); | |
7128 | size_t init_size = size; | |
7129 | void **table; | |
7130 | ||
7131 | table = kcalloc(nr_tables, sizeof(*table), GFP_KERNEL); | |
7132 | if (!table) | |
7133 | return NULL; | |
7134 | ||
7135 | for (i = 0; i < nr_tables; i++) { | |
27f6b318 | 7136 | unsigned int this_size = min_t(size_t, size, PAGE_SIZE); |
9123c8ff PB |
7137 | |
7138 | table[i] = kzalloc(this_size, GFP_KERNEL); | |
7139 | if (!table[i]) { | |
7140 | io_free_page_table(table, init_size); | |
7141 | return NULL; | |
7142 | } | |
7143 | size -= this_size; | |
7144 | } | |
7145 | return table; | |
05f3fb3c JA |
7146 | } |
7147 | ||
28a9fe25 | 7148 | static void io_rsrc_node_destroy(struct io_rsrc_node *ref_node) |
1642b445 | 7149 | { |
28a9fe25 PB |
7150 | percpu_ref_exit(&ref_node->refs); |
7151 | kfree(ref_node); | |
1642b445 PB |
7152 | } |
7153 | ||
b9bd2bea PB |
7154 | static void io_rsrc_node_ref_zero(struct percpu_ref *ref) |
7155 | { | |
7156 | struct io_rsrc_node *node = container_of(ref, struct io_rsrc_node, refs); | |
7157 | struct io_ring_ctx *ctx = node->rsrc_data->ctx; | |
7158 | unsigned long flags; | |
7159 | bool first_add = false; | |
7160 | ||
7161 | spin_lock_irqsave(&ctx->rsrc_ref_lock, flags); | |
7162 | node->done = true; | |
7163 | ||
7164 | while (!list_empty(&ctx->rsrc_ref_list)) { | |
7165 | node = list_first_entry(&ctx->rsrc_ref_list, | |
7166 | struct io_rsrc_node, node); | |
7167 | /* recycle ref nodes in order */ | |
7168 | if (!node->done) | |
7169 | break; | |
7170 | list_del(&node->node); | |
7171 | first_add |= llist_add(&node->llist, &ctx->rsrc_put_llist); | |
7172 | } | |
7173 | spin_unlock_irqrestore(&ctx->rsrc_ref_lock, flags); | |
7174 | ||
7175 | if (first_add) | |
7176 | mod_delayed_work(system_wq, &ctx->rsrc_put_work, HZ); | |
7177 | } | |
7178 | ||
7179 | static struct io_rsrc_node *io_rsrc_node_alloc(struct io_ring_ctx *ctx) | |
7180 | { | |
7181 | struct io_rsrc_node *ref_node; | |
7182 | ||
7183 | ref_node = kzalloc(sizeof(*ref_node), GFP_KERNEL); | |
7184 | if (!ref_node) | |
7185 | return NULL; | |
7186 | ||
7187 | if (percpu_ref_init(&ref_node->refs, io_rsrc_node_ref_zero, | |
7188 | 0, GFP_KERNEL)) { | |
7189 | kfree(ref_node); | |
7190 | return NULL; | |
7191 | } | |
7192 | INIT_LIST_HEAD(&ref_node->node); | |
7193 | INIT_LIST_HEAD(&ref_node->rsrc_list); | |
7194 | ref_node->done = false; | |
7195 | return ref_node; | |
7196 | } | |
7197 | ||
a7f0ed5a PB |
7198 | static void io_rsrc_node_switch(struct io_ring_ctx *ctx, |
7199 | struct io_rsrc_data *data_to_kill) | |
6b06314c | 7200 | { |
a7f0ed5a PB |
7201 | WARN_ON_ONCE(!ctx->rsrc_backup_node); |
7202 | WARN_ON_ONCE(data_to_kill && !ctx->rsrc_node); | |
6b06314c | 7203 | |
a7f0ed5a PB |
7204 | if (data_to_kill) { |
7205 | struct io_rsrc_node *rsrc_node = ctx->rsrc_node; | |
82fbcfa9 | 7206 | |
a7f0ed5a | 7207 | rsrc_node->rsrc_data = data_to_kill; |
4956b9ea | 7208 | spin_lock_irq(&ctx->rsrc_ref_lock); |
a7f0ed5a | 7209 | list_add_tail(&rsrc_node->node, &ctx->rsrc_ref_list); |
4956b9ea | 7210 | spin_unlock_irq(&ctx->rsrc_ref_lock); |
82fbcfa9 | 7211 | |
3e942498 | 7212 | atomic_inc(&data_to_kill->refs); |
a7f0ed5a PB |
7213 | percpu_ref_kill(&rsrc_node->refs); |
7214 | ctx->rsrc_node = NULL; | |
7215 | } | |
6b06314c | 7216 | |
a7f0ed5a PB |
7217 | if (!ctx->rsrc_node) { |
7218 | ctx->rsrc_node = ctx->rsrc_backup_node; | |
7219 | ctx->rsrc_backup_node = NULL; | |
7220 | } | |
8bad28d8 HX |
7221 | } |
7222 | ||
a7f0ed5a | 7223 | static int io_rsrc_node_switch_start(struct io_ring_ctx *ctx) |
8dd03afe PB |
7224 | { |
7225 | if (ctx->rsrc_backup_node) | |
7226 | return 0; | |
b895c9a6 | 7227 | ctx->rsrc_backup_node = io_rsrc_node_alloc(ctx); |
8dd03afe | 7228 | return ctx->rsrc_backup_node ? 0 : -ENOMEM; |
8bad28d8 HX |
7229 | } |
7230 | ||
40ae0ff7 | 7231 | static int io_rsrc_ref_quiesce(struct io_rsrc_data *data, struct io_ring_ctx *ctx) |
8bad28d8 HX |
7232 | { |
7233 | int ret; | |
05589553 | 7234 | |
215c3902 | 7235 | /* As we may drop ->uring_lock, other task may have started quiesce */ |
8bad28d8 HX |
7236 | if (data->quiesce) |
7237 | return -ENXIO; | |
05589553 | 7238 | |
8bad28d8 | 7239 | data->quiesce = true; |
1ffc5422 | 7240 | do { |
a7f0ed5a | 7241 | ret = io_rsrc_node_switch_start(ctx); |
8dd03afe | 7242 | if (ret) |
f2303b1f | 7243 | break; |
a7f0ed5a | 7244 | io_rsrc_node_switch(ctx, data); |
f2303b1f | 7245 | |
3e942498 PB |
7246 | /* kill initial ref, already quiesced if zero */ |
7247 | if (atomic_dec_and_test(&data->refs)) | |
7248 | break; | |
c018db4a | 7249 | mutex_unlock(&ctx->uring_lock); |
8bad28d8 | 7250 | flush_delayed_work(&ctx->rsrc_put_work); |
1ffc5422 | 7251 | ret = wait_for_completion_interruptible(&data->done); |
c018db4a JA |
7252 | if (!ret) { |
7253 | mutex_lock(&ctx->uring_lock); | |
1ffc5422 | 7254 | break; |
c018db4a | 7255 | } |
8bad28d8 | 7256 | |
3e942498 PB |
7257 | atomic_inc(&data->refs); |
7258 | /* wait for all works potentially completing data->done */ | |
7259 | flush_delayed_work(&ctx->rsrc_put_work); | |
cb5e1b81 | 7260 | reinit_completion(&data->done); |
8dd03afe | 7261 | |
1ffc5422 | 7262 | ret = io_run_task_work_sig(); |
8bad28d8 | 7263 | mutex_lock(&ctx->uring_lock); |
f2303b1f | 7264 | } while (ret >= 0); |
8bad28d8 | 7265 | data->quiesce = false; |
05f3fb3c | 7266 | |
8bad28d8 | 7267 | return ret; |
d7954b2b BM |
7268 | } |
7269 | ||
2d091d62 PB |
7270 | static u64 *io_get_tag_slot(struct io_rsrc_data *data, unsigned int idx) |
7271 | { | |
7272 | unsigned int off = idx & IO_RSRC_TAG_TABLE_MASK; | |
7273 | unsigned int table_idx = idx >> IO_RSRC_TAG_TABLE_SHIFT; | |
7274 | ||
7275 | return &data->tags[table_idx][off]; | |
7276 | } | |
7277 | ||
44b31f2f | 7278 | static void io_rsrc_data_free(struct io_rsrc_data *data) |
1ad555c6 | 7279 | { |
2d091d62 PB |
7280 | size_t size = data->nr * sizeof(data->tags[0][0]); |
7281 | ||
7282 | if (data->tags) | |
7283 | io_free_page_table((void **)data->tags, size); | |
44b31f2f PB |
7284 | kfree(data); |
7285 | } | |
7286 | ||
d878c816 PB |
7287 | static int io_rsrc_data_alloc(struct io_ring_ctx *ctx, rsrc_put_fn *do_put, |
7288 | u64 __user *utags, unsigned nr, | |
7289 | struct io_rsrc_data **pdata) | |
1ad555c6 | 7290 | { |
b895c9a6 | 7291 | struct io_rsrc_data *data; |
2d091d62 | 7292 | int ret = -ENOMEM; |
d878c816 | 7293 | unsigned i; |
1ad555c6 BM |
7294 | |
7295 | data = kzalloc(sizeof(*data), GFP_KERNEL); | |
7296 | if (!data) | |
d878c816 | 7297 | return -ENOMEM; |
2d091d62 | 7298 | data->tags = (u64 **)io_alloc_page_table(nr * sizeof(data->tags[0][0])); |
b60c8dce | 7299 | if (!data->tags) { |
1ad555c6 | 7300 | kfree(data); |
d878c816 PB |
7301 | return -ENOMEM; |
7302 | } | |
2d091d62 PB |
7303 | |
7304 | data->nr = nr; | |
7305 | data->ctx = ctx; | |
7306 | data->do_put = do_put; | |
d878c816 | 7307 | if (utags) { |
2d091d62 | 7308 | ret = -EFAULT; |
d878c816 | 7309 | for (i = 0; i < nr; i++) { |
fdd1dc31 CIK |
7310 | u64 *tag_slot = io_get_tag_slot(data, i); |
7311 | ||
7312 | if (copy_from_user(tag_slot, &utags[i], | |
7313 | sizeof(*tag_slot))) | |
2d091d62 | 7314 | goto fail; |
d878c816 | 7315 | } |
1ad555c6 | 7316 | } |
b60c8dce | 7317 | |
3e942498 | 7318 | atomic_set(&data->refs, 1); |
1ad555c6 | 7319 | init_completion(&data->done); |
d878c816 PB |
7320 | *pdata = data; |
7321 | return 0; | |
2d091d62 PB |
7322 | fail: |
7323 | io_rsrc_data_free(data); | |
7324 | return ret; | |
1ad555c6 BM |
7325 | } |
7326 | ||
9123c8ff PB |
7327 | static bool io_alloc_file_tables(struct io_file_table *table, unsigned nr_files) |
7328 | { | |
042b0d85 | 7329 | table->files = kvcalloc(nr_files, sizeof(table->files[0]), GFP_KERNEL); |
9123c8ff PB |
7330 | return !!table->files; |
7331 | } | |
7332 | ||
042b0d85 | 7333 | static void io_free_file_tables(struct io_file_table *table) |
9123c8ff | 7334 | { |
042b0d85 | 7335 | kvfree(table->files); |
9123c8ff PB |
7336 | table->files = NULL; |
7337 | } | |
7338 | ||
fff4db76 | 7339 | static void __io_sqe_files_unregister(struct io_ring_ctx *ctx) |
1ad555c6 | 7340 | { |
fff4db76 PB |
7341 | #if defined(CONFIG_UNIX) |
7342 | if (ctx->ring_sock) { | |
7343 | struct sock *sock = ctx->ring_sock->sk; | |
7344 | struct sk_buff *skb; | |
7345 | ||
7346 | while ((skb = skb_dequeue(&sock->sk_receive_queue)) != NULL) | |
7347 | kfree_skb(skb); | |
7348 | } | |
7349 | #else | |
7350 | int i; | |
7351 | ||
7352 | for (i = 0; i < ctx->nr_user_files; i++) { | |
7353 | struct file *file; | |
7354 | ||
7355 | file = io_file_from_index(ctx, i); | |
7356 | if (file) | |
7357 | fput(file); | |
7358 | } | |
7359 | #endif | |
042b0d85 | 7360 | io_free_file_tables(&ctx->file_table); |
44b31f2f | 7361 | io_rsrc_data_free(ctx->file_data); |
fff4db76 PB |
7362 | ctx->file_data = NULL; |
7363 | ctx->nr_user_files = 0; | |
1ad555c6 BM |
7364 | } |
7365 | ||
d7954b2b BM |
7366 | static int io_sqe_files_unregister(struct io_ring_ctx *ctx) |
7367 | { | |
d7954b2b BM |
7368 | int ret; |
7369 | ||
08480400 | 7370 | if (!ctx->file_data) |
d7954b2b | 7371 | return -ENXIO; |
08480400 PB |
7372 | ret = io_rsrc_ref_quiesce(ctx->file_data, ctx); |
7373 | if (!ret) | |
7374 | __io_sqe_files_unregister(ctx); | |
7375 | return ret; | |
6b06314c JA |
7376 | } |
7377 | ||
37d1e2e3 | 7378 | static void io_sq_thread_unpark(struct io_sq_data *sqd) |
09a6f4ef | 7379 | __releases(&sqd->lock) |
37d1e2e3 | 7380 | { |
521d6a73 PB |
7381 | WARN_ON_ONCE(sqd->thread == current); |
7382 | ||
9e138a48 PB |
7383 | /* |
7384 | * Do the dance but not conditional clear_bit() because it'd race with | |
7385 | * other threads incrementing park_pending and setting the bit. | |
7386 | */ | |
37d1e2e3 | 7387 | clear_bit(IO_SQ_THREAD_SHOULD_PARK, &sqd->state); |
9e138a48 PB |
7388 | if (atomic_dec_return(&sqd->park_pending)) |
7389 | set_bit(IO_SQ_THREAD_SHOULD_PARK, &sqd->state); | |
09a6f4ef | 7390 | mutex_unlock(&sqd->lock); |
37d1e2e3 JA |
7391 | } |
7392 | ||
86e0d676 | 7393 | static void io_sq_thread_park(struct io_sq_data *sqd) |
09a6f4ef | 7394 | __acquires(&sqd->lock) |
37d1e2e3 | 7395 | { |
521d6a73 PB |
7396 | WARN_ON_ONCE(sqd->thread == current); |
7397 | ||
9e138a48 | 7398 | atomic_inc(&sqd->park_pending); |
86e0d676 | 7399 | set_bit(IO_SQ_THREAD_SHOULD_PARK, &sqd->state); |
09a6f4ef | 7400 | mutex_lock(&sqd->lock); |
05962f95 | 7401 | if (sqd->thread) |
86e0d676 | 7402 | wake_up_process(sqd->thread); |
37d1e2e3 JA |
7403 | } |
7404 | ||
7405 | static void io_sq_thread_stop(struct io_sq_data *sqd) | |
7406 | { | |
521d6a73 | 7407 | WARN_ON_ONCE(sqd->thread == current); |
88885f66 | 7408 | WARN_ON_ONCE(test_bit(IO_SQ_THREAD_SHOULD_STOP, &sqd->state)); |
521d6a73 | 7409 | |
05962f95 | 7410 | set_bit(IO_SQ_THREAD_SHOULD_STOP, &sqd->state); |
88885f66 | 7411 | mutex_lock(&sqd->lock); |
e8f98f24 JA |
7412 | if (sqd->thread) |
7413 | wake_up_process(sqd->thread); | |
09a6f4ef | 7414 | mutex_unlock(&sqd->lock); |
05962f95 | 7415 | wait_for_completion(&sqd->exited); |
37d1e2e3 JA |
7416 | } |
7417 | ||
534ca6d6 | 7418 | static void io_put_sq_data(struct io_sq_data *sqd) |
6c271ce2 | 7419 | { |
534ca6d6 | 7420 | if (refcount_dec_and_test(&sqd->refs)) { |
9e138a48 PB |
7421 | WARN_ON_ONCE(atomic_read(&sqd->park_pending)); |
7422 | ||
37d1e2e3 JA |
7423 | io_sq_thread_stop(sqd); |
7424 | kfree(sqd); | |
7425 | } | |
7426 | } | |
7427 | ||
7428 | static void io_sq_thread_finish(struct io_ring_ctx *ctx) | |
7429 | { | |
7430 | struct io_sq_data *sqd = ctx->sq_data; | |
7431 | ||
7432 | if (sqd) { | |
05962f95 | 7433 | io_sq_thread_park(sqd); |
521d6a73 | 7434 | list_del_init(&ctx->sqd_list); |
37d1e2e3 | 7435 | io_sqd_update_thread_idle(sqd); |
05962f95 | 7436 | io_sq_thread_unpark(sqd); |
37d1e2e3 JA |
7437 | |
7438 | io_put_sq_data(sqd); | |
7439 | ctx->sq_data = NULL; | |
534ca6d6 JA |
7440 | } |
7441 | } | |
7442 | ||
aa06165d JA |
7443 | static struct io_sq_data *io_attach_sq_data(struct io_uring_params *p) |
7444 | { | |
7445 | struct io_ring_ctx *ctx_attach; | |
7446 | struct io_sq_data *sqd; | |
7447 | struct fd f; | |
7448 | ||
7449 | f = fdget(p->wq_fd); | |
7450 | if (!f.file) | |
7451 | return ERR_PTR(-ENXIO); | |
7452 | if (f.file->f_op != &io_uring_fops) { | |
7453 | fdput(f); | |
7454 | return ERR_PTR(-EINVAL); | |
7455 | } | |
7456 | ||
7457 | ctx_attach = f.file->private_data; | |
7458 | sqd = ctx_attach->sq_data; | |
7459 | if (!sqd) { | |
7460 | fdput(f); | |
7461 | return ERR_PTR(-EINVAL); | |
7462 | } | |
5c2469e0 JA |
7463 | if (sqd->task_tgid != current->tgid) { |
7464 | fdput(f); | |
7465 | return ERR_PTR(-EPERM); | |
7466 | } | |
aa06165d JA |
7467 | |
7468 | refcount_inc(&sqd->refs); | |
7469 | fdput(f); | |
7470 | return sqd; | |
7471 | } | |
7472 | ||
26984fbf PB |
7473 | static struct io_sq_data *io_get_sq_data(struct io_uring_params *p, |
7474 | bool *attached) | |
534ca6d6 JA |
7475 | { |
7476 | struct io_sq_data *sqd; | |
7477 | ||
26984fbf | 7478 | *attached = false; |
5c2469e0 JA |
7479 | if (p->flags & IORING_SETUP_ATTACH_WQ) { |
7480 | sqd = io_attach_sq_data(p); | |
26984fbf PB |
7481 | if (!IS_ERR(sqd)) { |
7482 | *attached = true; | |
5c2469e0 | 7483 | return sqd; |
26984fbf | 7484 | } |
5c2469e0 JA |
7485 | /* fall through for EPERM case, setup new sqd/task */ |
7486 | if (PTR_ERR(sqd) != -EPERM) | |
7487 | return sqd; | |
7488 | } | |
aa06165d | 7489 | |
534ca6d6 JA |
7490 | sqd = kzalloc(sizeof(*sqd), GFP_KERNEL); |
7491 | if (!sqd) | |
7492 | return ERR_PTR(-ENOMEM); | |
7493 | ||
9e138a48 | 7494 | atomic_set(&sqd->park_pending, 0); |
534ca6d6 | 7495 | refcount_set(&sqd->refs, 1); |
69fb2131 | 7496 | INIT_LIST_HEAD(&sqd->ctx_list); |
09a6f4ef | 7497 | mutex_init(&sqd->lock); |
534ca6d6 | 7498 | init_waitqueue_head(&sqd->wait); |
37d1e2e3 | 7499 | init_completion(&sqd->exited); |
534ca6d6 JA |
7500 | return sqd; |
7501 | } | |
7502 | ||
6b06314c | 7503 | #if defined(CONFIG_UNIX) |
6b06314c JA |
7504 | /* |
7505 | * Ensure the UNIX gc is aware of our file set, so we are certain that | |
7506 | * the io_uring can be safely unregistered on process exit, even if we have | |
7507 | * loops in the file referencing. | |
7508 | */ | |
7509 | static int __io_sqe_files_scm(struct io_ring_ctx *ctx, int nr, int offset) | |
7510 | { | |
7511 | struct sock *sk = ctx->ring_sock->sk; | |
7512 | struct scm_fp_list *fpl; | |
7513 | struct sk_buff *skb; | |
08a45173 | 7514 | int i, nr_files; |
6b06314c | 7515 | |
6b06314c JA |
7516 | fpl = kzalloc(sizeof(*fpl), GFP_KERNEL); |
7517 | if (!fpl) | |
7518 | return -ENOMEM; | |
7519 | ||
7520 | skb = alloc_skb(0, GFP_KERNEL); | |
7521 | if (!skb) { | |
7522 | kfree(fpl); | |
7523 | return -ENOMEM; | |
7524 | } | |
7525 | ||
7526 | skb->sk = sk; | |
6b06314c | 7527 | |
08a45173 | 7528 | nr_files = 0; |
62e398be | 7529 | fpl->user = get_uid(current_user()); |
6b06314c | 7530 | for (i = 0; i < nr; i++) { |
65e19f54 JA |
7531 | struct file *file = io_file_from_index(ctx, i + offset); |
7532 | ||
7533 | if (!file) | |
08a45173 | 7534 | continue; |
65e19f54 | 7535 | fpl->fp[nr_files] = get_file(file); |
08a45173 JA |
7536 | unix_inflight(fpl->user, fpl->fp[nr_files]); |
7537 | nr_files++; | |
6b06314c JA |
7538 | } |
7539 | ||
08a45173 JA |
7540 | if (nr_files) { |
7541 | fpl->max = SCM_MAX_FD; | |
7542 | fpl->count = nr_files; | |
7543 | UNIXCB(skb).fp = fpl; | |
05f3fb3c | 7544 | skb->destructor = unix_destruct_scm; |
08a45173 JA |
7545 | refcount_add(skb->truesize, &sk->sk_wmem_alloc); |
7546 | skb_queue_head(&sk->sk_receive_queue, skb); | |
6b06314c | 7547 | |
08a45173 JA |
7548 | for (i = 0; i < nr_files; i++) |
7549 | fput(fpl->fp[i]); | |
7550 | } else { | |
7551 | kfree_skb(skb); | |
7552 | kfree(fpl); | |
7553 | } | |
6b06314c JA |
7554 | |
7555 | return 0; | |
7556 | } | |
7557 | ||
7558 | /* | |
7559 | * If UNIX sockets are enabled, fd passing can cause a reference cycle which | |
7560 | * causes regular reference counting to break down. We rely on the UNIX | |
7561 | * garbage collection to take care of this problem for us. | |
7562 | */ | |
7563 | static int io_sqe_files_scm(struct io_ring_ctx *ctx) | |
7564 | { | |
7565 | unsigned left, total; | |
7566 | int ret = 0; | |
7567 | ||
7568 | total = 0; | |
7569 | left = ctx->nr_user_files; | |
7570 | while (left) { | |
7571 | unsigned this_files = min_t(unsigned, left, SCM_MAX_FD); | |
6b06314c JA |
7572 | |
7573 | ret = __io_sqe_files_scm(ctx, this_files, total); | |
7574 | if (ret) | |
7575 | break; | |
7576 | left -= this_files; | |
7577 | total += this_files; | |
7578 | } | |
7579 | ||
7580 | if (!ret) | |
7581 | return 0; | |
7582 | ||
7583 | while (total < ctx->nr_user_files) { | |
65e19f54 JA |
7584 | struct file *file = io_file_from_index(ctx, total); |
7585 | ||
7586 | if (file) | |
7587 | fput(file); | |
6b06314c JA |
7588 | total++; |
7589 | } | |
7590 | ||
7591 | return ret; | |
7592 | } | |
7593 | #else | |
7594 | static int io_sqe_files_scm(struct io_ring_ctx *ctx) | |
7595 | { | |
7596 | return 0; | |
7597 | } | |
7598 | #endif | |
7599 | ||
47e90392 | 7600 | static void io_rsrc_file_put(struct io_ring_ctx *ctx, struct io_rsrc_put *prsrc) |
05f3fb3c | 7601 | { |
50238531 | 7602 | struct file *file = prsrc->file; |
05f3fb3c JA |
7603 | #if defined(CONFIG_UNIX) |
7604 | struct sock *sock = ctx->ring_sock->sk; | |
7605 | struct sk_buff_head list, *head = &sock->sk_receive_queue; | |
7606 | struct sk_buff *skb; | |
7607 | int i; | |
7608 | ||
7609 | __skb_queue_head_init(&list); | |
7610 | ||
7611 | /* | |
7612 | * Find the skb that holds this file in its SCM_RIGHTS. When found, | |
7613 | * remove this entry and rearrange the file array. | |
7614 | */ | |
7615 | skb = skb_dequeue(head); | |
7616 | while (skb) { | |
7617 | struct scm_fp_list *fp; | |
7618 | ||
7619 | fp = UNIXCB(skb).fp; | |
7620 | for (i = 0; i < fp->count; i++) { | |
7621 | int left; | |
7622 | ||
7623 | if (fp->fp[i] != file) | |
7624 | continue; | |
7625 | ||
7626 | unix_notinflight(fp->user, fp->fp[i]); | |
7627 | left = fp->count - 1 - i; | |
7628 | if (left) { | |
7629 | memmove(&fp->fp[i], &fp->fp[i + 1], | |
7630 | left * sizeof(struct file *)); | |
7631 | } | |
7632 | fp->count--; | |
7633 | if (!fp->count) { | |
7634 | kfree_skb(skb); | |
7635 | skb = NULL; | |
7636 | } else { | |
7637 | __skb_queue_tail(&list, skb); | |
7638 | } | |
7639 | fput(file); | |
7640 | file = NULL; | |
7641 | break; | |
7642 | } | |
7643 | ||
7644 | if (!file) | |
7645 | break; | |
7646 | ||
7647 | __skb_queue_tail(&list, skb); | |
7648 | ||
7649 | skb = skb_dequeue(head); | |
7650 | } | |
7651 | ||
7652 | if (skb_peek(&list)) { | |
7653 | spin_lock_irq(&head->lock); | |
7654 | while ((skb = __skb_dequeue(&list)) != NULL) | |
7655 | __skb_queue_tail(head, skb); | |
7656 | spin_unlock_irq(&head->lock); | |
7657 | } | |
7658 | #else | |
7659 | fput(file); | |
7660 | #endif | |
7661 | } | |
7662 | ||
b895c9a6 | 7663 | static void __io_rsrc_put_work(struct io_rsrc_node *ref_node) |
65e19f54 | 7664 | { |
b895c9a6 | 7665 | struct io_rsrc_data *rsrc_data = ref_node->rsrc_data; |
269bbe5f BM |
7666 | struct io_ring_ctx *ctx = rsrc_data->ctx; |
7667 | struct io_rsrc_put *prsrc, *tmp; | |
05589553 | 7668 | |
269bbe5f BM |
7669 | list_for_each_entry_safe(prsrc, tmp, &ref_node->rsrc_list, list) { |
7670 | list_del(&prsrc->list); | |
b60c8dce PB |
7671 | |
7672 | if (prsrc->tag) { | |
7673 | bool lock_ring = ctx->flags & IORING_SETUP_IOPOLL; | |
b60c8dce PB |
7674 | |
7675 | io_ring_submit_lock(ctx, lock_ring); | |
157d257f | 7676 | spin_lock_irq(&ctx->completion_lock); |
b60c8dce | 7677 | io_cqring_fill_event(ctx, prsrc->tag, 0, 0); |
2840f710 | 7678 | ctx->cq_extra++; |
b60c8dce | 7679 | io_commit_cqring(ctx); |
157d257f | 7680 | spin_unlock_irq(&ctx->completion_lock); |
b60c8dce PB |
7681 | io_cqring_ev_posted(ctx); |
7682 | io_ring_submit_unlock(ctx, lock_ring); | |
7683 | } | |
7684 | ||
40ae0ff7 | 7685 | rsrc_data->do_put(ctx, prsrc); |
269bbe5f | 7686 | kfree(prsrc); |
65e19f54 | 7687 | } |
05589553 | 7688 | |
28a9fe25 | 7689 | io_rsrc_node_destroy(ref_node); |
3e942498 PB |
7690 | if (atomic_dec_and_test(&rsrc_data->refs)) |
7691 | complete(&rsrc_data->done); | |
2faf852d | 7692 | } |
65e19f54 | 7693 | |
269bbe5f | 7694 | static void io_rsrc_put_work(struct work_struct *work) |
4a38aed2 JA |
7695 | { |
7696 | struct io_ring_ctx *ctx; | |
7697 | struct llist_node *node; | |
7698 | ||
269bbe5f BM |
7699 | ctx = container_of(work, struct io_ring_ctx, rsrc_put_work.work); |
7700 | node = llist_del_all(&ctx->rsrc_put_llist); | |
4a38aed2 JA |
7701 | |
7702 | while (node) { | |
b895c9a6 | 7703 | struct io_rsrc_node *ref_node; |
4a38aed2 JA |
7704 | struct llist_node *next = node->next; |
7705 | ||
b895c9a6 | 7706 | ref_node = llist_entry(node, struct io_rsrc_node, llist); |
269bbe5f | 7707 | __io_rsrc_put_work(ref_node); |
4a38aed2 JA |
7708 | node = next; |
7709 | } | |
7710 | } | |
7711 | ||
6b06314c | 7712 | static int io_sqe_files_register(struct io_ring_ctx *ctx, void __user *arg, |
792e3582 | 7713 | unsigned nr_args, u64 __user *tags) |
6b06314c JA |
7714 | { |
7715 | __s32 __user *fds = (__s32 __user *) arg; | |
05f3fb3c | 7716 | struct file *file; |
f3baed39 | 7717 | int fd, ret; |
846a4ef2 | 7718 | unsigned i; |
6b06314c | 7719 | |
05f3fb3c | 7720 | if (ctx->file_data) |
6b06314c JA |
7721 | return -EBUSY; |
7722 | if (!nr_args) | |
7723 | return -EINVAL; | |
7724 | if (nr_args > IORING_MAX_FIXED_FILES) | |
7725 | return -EMFILE; | |
a7f0ed5a | 7726 | ret = io_rsrc_node_switch_start(ctx); |
f3baed39 PB |
7727 | if (ret) |
7728 | return ret; | |
d878c816 PB |
7729 | ret = io_rsrc_data_alloc(ctx, io_rsrc_file_put, tags, nr_args, |
7730 | &ctx->file_data); | |
7731 | if (ret) | |
7732 | return ret; | |
6b06314c | 7733 | |
f3baed39 | 7734 | ret = -ENOMEM; |
aeca241b | 7735 | if (!io_alloc_file_tables(&ctx->file_table, nr_args)) |
1ad555c6 | 7736 | goto out_free; |
65e19f54 | 7737 | |
08a45173 | 7738 | for (i = 0; i < nr_args; i++, ctx->nr_user_files++) { |
d878c816 | 7739 | if (copy_from_user(&fd, &fds[i], sizeof(fd))) { |
600cf3f8 PB |
7740 | ret = -EFAULT; |
7741 | goto out_fput; | |
7742 | } | |
08a45173 | 7743 | /* allow sparse sets */ |
792e3582 PB |
7744 | if (fd == -1) { |
7745 | ret = -EINVAL; | |
2d091d62 | 7746 | if (unlikely(*io_get_tag_slot(ctx->file_data, i))) |
792e3582 | 7747 | goto out_fput; |
08a45173 | 7748 | continue; |
792e3582 | 7749 | } |
6b06314c | 7750 | |
05f3fb3c | 7751 | file = fget(fd); |
6b06314c | 7752 | ret = -EBADF; |
792e3582 | 7753 | if (unlikely(!file)) |
600cf3f8 | 7754 | goto out_fput; |
05f3fb3c | 7755 | |
6b06314c JA |
7756 | /* |
7757 | * Don't allow io_uring instances to be registered. If UNIX | |
7758 | * isn't enabled, then this causes a reference cycle and this | |
7759 | * instance can never get freed. If UNIX is enabled we'll | |
7760 | * handle it just fine, but there's still no point in allowing | |
7761 | * a ring fd as it doesn't support regular read/write anyway. | |
7762 | */ | |
05f3fb3c JA |
7763 | if (file->f_op == &io_uring_fops) { |
7764 | fput(file); | |
600cf3f8 | 7765 | goto out_fput; |
6b06314c | 7766 | } |
aeca241b | 7767 | io_fixed_file_set(io_fixed_file_slot(&ctx->file_table, i), file); |
6b06314c JA |
7768 | } |
7769 | ||
6b06314c | 7770 | ret = io_sqe_files_scm(ctx); |
05589553 | 7771 | if (ret) { |
08480400 | 7772 | __io_sqe_files_unregister(ctx); |
05589553 XW |
7773 | return ret; |
7774 | } | |
6b06314c | 7775 | |
a7f0ed5a | 7776 | io_rsrc_node_switch(ctx, NULL); |
6b06314c | 7777 | return ret; |
600cf3f8 PB |
7778 | out_fput: |
7779 | for (i = 0; i < ctx->nr_user_files; i++) { | |
7780 | file = io_file_from_index(ctx, i); | |
7781 | if (file) | |
7782 | fput(file); | |
7783 | } | |
042b0d85 | 7784 | io_free_file_tables(&ctx->file_table); |
600cf3f8 | 7785 | ctx->nr_user_files = 0; |
600cf3f8 | 7786 | out_free: |
44b31f2f | 7787 | io_rsrc_data_free(ctx->file_data); |
55cbc256 | 7788 | ctx->file_data = NULL; |
6b06314c JA |
7789 | return ret; |
7790 | } | |
7791 | ||
c3a31e60 JA |
7792 | static int io_sqe_file_register(struct io_ring_ctx *ctx, struct file *file, |
7793 | int index) | |
7794 | { | |
7795 | #if defined(CONFIG_UNIX) | |
7796 | struct sock *sock = ctx->ring_sock->sk; | |
7797 | struct sk_buff_head *head = &sock->sk_receive_queue; | |
7798 | struct sk_buff *skb; | |
7799 | ||
7800 | /* | |
7801 | * See if we can merge this file into an existing skb SCM_RIGHTS | |
7802 | * file set. If there's no room, fall back to allocating a new skb | |
7803 | * and filling it in. | |
7804 | */ | |
7805 | spin_lock_irq(&head->lock); | |
7806 | skb = skb_peek(head); | |
7807 | if (skb) { | |
7808 | struct scm_fp_list *fpl = UNIXCB(skb).fp; | |
7809 | ||
7810 | if (fpl->count < SCM_MAX_FD) { | |
7811 | __skb_unlink(skb, head); | |
7812 | spin_unlock_irq(&head->lock); | |
7813 | fpl->fp[fpl->count] = get_file(file); | |
7814 | unix_inflight(fpl->user, fpl->fp[fpl->count]); | |
7815 | fpl->count++; | |
7816 | spin_lock_irq(&head->lock); | |
7817 | __skb_queue_head(head, skb); | |
7818 | } else { | |
7819 | skb = NULL; | |
7820 | } | |
7821 | } | |
7822 | spin_unlock_irq(&head->lock); | |
7823 | ||
7824 | if (skb) { | |
7825 | fput(file); | |
7826 | return 0; | |
7827 | } | |
7828 | ||
7829 | return __io_sqe_files_scm(ctx, 1, index); | |
7830 | #else | |
7831 | return 0; | |
7832 | #endif | |
7833 | } | |
7834 | ||
b60c8dce | 7835 | static int io_queue_rsrc_removal(struct io_rsrc_data *data, unsigned idx, |
e7c78371 | 7836 | struct io_rsrc_node *node, void *rsrc) |
05f3fb3c | 7837 | { |
269bbe5f | 7838 | struct io_rsrc_put *prsrc; |
05f3fb3c | 7839 | |
269bbe5f BM |
7840 | prsrc = kzalloc(sizeof(*prsrc), GFP_KERNEL); |
7841 | if (!prsrc) | |
a5318d3c | 7842 | return -ENOMEM; |
05f3fb3c | 7843 | |
2d091d62 | 7844 | prsrc->tag = *io_get_tag_slot(data, idx); |
50238531 | 7845 | prsrc->rsrc = rsrc; |
e7c78371 | 7846 | list_add(&prsrc->list, &node->rsrc_list); |
a5318d3c | 7847 | return 0; |
05f3fb3c JA |
7848 | } |
7849 | ||
7850 | static int __io_sqe_files_update(struct io_ring_ctx *ctx, | |
c3bdad02 | 7851 | struct io_uring_rsrc_update2 *up, |
05f3fb3c JA |
7852 | unsigned nr_args) |
7853 | { | |
c3bdad02 | 7854 | u64 __user *tags = u64_to_user_ptr(up->tags); |
98f0b3b4 | 7855 | __s32 __user *fds = u64_to_user_ptr(up->data); |
b895c9a6 | 7856 | struct io_rsrc_data *data = ctx->file_data; |
a04b0ac0 PB |
7857 | struct io_fixed_file *file_slot; |
7858 | struct file *file; | |
98f0b3b4 PB |
7859 | int fd, i, err = 0; |
7860 | unsigned int done; | |
05589553 | 7861 | bool needs_switch = false; |
c3a31e60 | 7862 | |
98f0b3b4 PB |
7863 | if (!ctx->file_data) |
7864 | return -ENXIO; | |
7865 | if (up->offset + nr_args > ctx->nr_user_files) | |
c3a31e60 JA |
7866 | return -EINVAL; |
7867 | ||
67973b93 | 7868 | for (done = 0; done < nr_args; done++) { |
c3bdad02 PB |
7869 | u64 tag = 0; |
7870 | ||
7871 | if ((tags && copy_from_user(&tag, &tags[done], sizeof(tag))) || | |
7872 | copy_from_user(&fd, &fds[done], sizeof(fd))) { | |
c3a31e60 JA |
7873 | err = -EFAULT; |
7874 | break; | |
7875 | } | |
c3bdad02 PB |
7876 | if ((fd == IORING_REGISTER_FILES_SKIP || fd == -1) && tag) { |
7877 | err = -EINVAL; | |
7878 | break; | |
7879 | } | |
4e0377a1 | 7880 | if (fd == IORING_REGISTER_FILES_SKIP) |
7881 | continue; | |
7882 | ||
67973b93 | 7883 | i = array_index_nospec(up->offset + done, ctx->nr_user_files); |
aeca241b | 7884 | file_slot = io_fixed_file_slot(&ctx->file_table, i); |
ea64ec02 | 7885 | |
a04b0ac0 PB |
7886 | if (file_slot->file_ptr) { |
7887 | file = (struct file *)(file_slot->file_ptr & FFS_MASK); | |
b60c8dce PB |
7888 | err = io_queue_rsrc_removal(data, up->offset + done, |
7889 | ctx->rsrc_node, file); | |
a5318d3c HD |
7890 | if (err) |
7891 | break; | |
a04b0ac0 | 7892 | file_slot->file_ptr = 0; |
05589553 | 7893 | needs_switch = true; |
c3a31e60 JA |
7894 | } |
7895 | if (fd != -1) { | |
c3a31e60 JA |
7896 | file = fget(fd); |
7897 | if (!file) { | |
7898 | err = -EBADF; | |
7899 | break; | |
7900 | } | |
7901 | /* | |
7902 | * Don't allow io_uring instances to be registered. If | |
7903 | * UNIX isn't enabled, then this causes a reference | |
7904 | * cycle and this instance can never get freed. If UNIX | |
7905 | * is enabled we'll handle it just fine, but there's | |
7906 | * still no point in allowing a ring fd as it doesn't | |
7907 | * support regular read/write anyway. | |
7908 | */ | |
7909 | if (file->f_op == &io_uring_fops) { | |
7910 | fput(file); | |
7911 | err = -EBADF; | |
7912 | break; | |
7913 | } | |
2d091d62 | 7914 | *io_get_tag_slot(data, up->offset + done) = tag; |
9a321c98 | 7915 | io_fixed_file_set(file_slot, file); |
c3a31e60 | 7916 | err = io_sqe_file_register(ctx, file, i); |
f3bd9dae | 7917 | if (err) { |
a04b0ac0 | 7918 | file_slot->file_ptr = 0; |
f3bd9dae | 7919 | fput(file); |
c3a31e60 | 7920 | break; |
f3bd9dae | 7921 | } |
c3a31e60 | 7922 | } |
05f3fb3c JA |
7923 | } |
7924 | ||
a7f0ed5a PB |
7925 | if (needs_switch) |
7926 | io_rsrc_node_switch(ctx, data); | |
c3a31e60 JA |
7927 | return done ? done : err; |
7928 | } | |
05589553 | 7929 | |
685fe7fe JA |
7930 | static struct io_wq *io_init_wq_offload(struct io_ring_ctx *ctx, |
7931 | struct task_struct *task) | |
24369c2e | 7932 | { |
e941894e | 7933 | struct io_wq_hash *hash; |
24369c2e | 7934 | struct io_wq_data data; |
24369c2e | 7935 | unsigned int concurrency; |
24369c2e | 7936 | |
362a9e65 | 7937 | mutex_lock(&ctx->uring_lock); |
e941894e JA |
7938 | hash = ctx->hash_map; |
7939 | if (!hash) { | |
7940 | hash = kzalloc(sizeof(*hash), GFP_KERNEL); | |
362a9e65 YY |
7941 | if (!hash) { |
7942 | mutex_unlock(&ctx->uring_lock); | |
e941894e | 7943 | return ERR_PTR(-ENOMEM); |
362a9e65 | 7944 | } |
e941894e JA |
7945 | refcount_set(&hash->refs, 1); |
7946 | init_waitqueue_head(&hash->wait); | |
7947 | ctx->hash_map = hash; | |
24369c2e | 7948 | } |
362a9e65 | 7949 | mutex_unlock(&ctx->uring_lock); |
24369c2e | 7950 | |
e941894e | 7951 | data.hash = hash; |
685fe7fe | 7952 | data.task = task; |
ebc11b6c | 7953 | data.free_work = io_wq_free_work; |
f5fa38c5 | 7954 | data.do_work = io_wq_submit_work; |
24369c2e | 7955 | |
d25e3a3d JA |
7956 | /* Do QD, or 4 * CPUS, whatever is smallest */ |
7957 | concurrency = min(ctx->sq_entries, 4 * num_online_cpus()); | |
24369c2e | 7958 | |
5aa75ed5 | 7959 | return io_wq_create(concurrency, &data); |
24369c2e PB |
7960 | } |
7961 | ||
5aa75ed5 JA |
7962 | static int io_uring_alloc_task_context(struct task_struct *task, |
7963 | struct io_ring_ctx *ctx) | |
0f212204 JA |
7964 | { |
7965 | struct io_uring_task *tctx; | |
d8a6df10 | 7966 | int ret; |
0f212204 | 7967 | |
09899b19 | 7968 | tctx = kzalloc(sizeof(*tctx), GFP_KERNEL); |
0f212204 JA |
7969 | if (unlikely(!tctx)) |
7970 | return -ENOMEM; | |
7971 | ||
d8a6df10 JA |
7972 | ret = percpu_counter_init(&tctx->inflight, 0, GFP_KERNEL); |
7973 | if (unlikely(ret)) { | |
7974 | kfree(tctx); | |
7975 | return ret; | |
7976 | } | |
7977 | ||
685fe7fe | 7978 | tctx->io_wq = io_init_wq_offload(ctx, task); |
5aa75ed5 JA |
7979 | if (IS_ERR(tctx->io_wq)) { |
7980 | ret = PTR_ERR(tctx->io_wq); | |
7981 | percpu_counter_destroy(&tctx->inflight); | |
7982 | kfree(tctx); | |
7983 | return ret; | |
7984 | } | |
7985 | ||
0f212204 JA |
7986 | xa_init(&tctx->xa); |
7987 | init_waitqueue_head(&tctx->wait); | |
fdaf083c | 7988 | atomic_set(&tctx->in_idle, 0); |
b303fe2e | 7989 | atomic_set(&tctx->inflight_tracked, 0); |
0f212204 | 7990 | task->io_uring = tctx; |
7cbf1722 JA |
7991 | spin_lock_init(&tctx->task_lock); |
7992 | INIT_WQ_LIST(&tctx->task_list); | |
7cbf1722 | 7993 | init_task_work(&tctx->task_work, tctx_task_work); |
0f212204 JA |
7994 | return 0; |
7995 | } | |
7996 | ||
7997 | void __io_uring_free(struct task_struct *tsk) | |
7998 | { | |
7999 | struct io_uring_task *tctx = tsk->io_uring; | |
8000 | ||
8001 | WARN_ON_ONCE(!xa_empty(&tctx->xa)); | |
ef8eaa4e | 8002 | WARN_ON_ONCE(tctx->io_wq); |
09899b19 | 8003 | WARN_ON_ONCE(tctx->cached_refs); |
ef8eaa4e | 8004 | |
d8a6df10 | 8005 | percpu_counter_destroy(&tctx->inflight); |
0f212204 JA |
8006 | kfree(tctx); |
8007 | tsk->io_uring = NULL; | |
8008 | } | |
8009 | ||
7e84e1c7 SG |
8010 | static int io_sq_offload_create(struct io_ring_ctx *ctx, |
8011 | struct io_uring_params *p) | |
2b188cc1 JA |
8012 | { |
8013 | int ret; | |
8014 | ||
d25e3a3d JA |
8015 | /* Retain compatibility with failing for an invalid attach attempt */ |
8016 | if ((ctx->flags & (IORING_SETUP_ATTACH_WQ | IORING_SETUP_SQPOLL)) == | |
8017 | IORING_SETUP_ATTACH_WQ) { | |
8018 | struct fd f; | |
8019 | ||
8020 | f = fdget(p->wq_fd); | |
8021 | if (!f.file) | |
8022 | return -ENXIO; | |
0cc936f7 JA |
8023 | if (f.file->f_op != &io_uring_fops) { |
8024 | fdput(f); | |
f2a48dd0 | 8025 | return -EINVAL; |
0cc936f7 JA |
8026 | } |
8027 | fdput(f); | |
d25e3a3d | 8028 | } |
6c271ce2 | 8029 | if (ctx->flags & IORING_SETUP_SQPOLL) { |
46fe18b1 | 8030 | struct task_struct *tsk; |
534ca6d6 | 8031 | struct io_sq_data *sqd; |
26984fbf | 8032 | bool attached; |
534ca6d6 | 8033 | |
26984fbf | 8034 | sqd = io_get_sq_data(p, &attached); |
534ca6d6 JA |
8035 | if (IS_ERR(sqd)) { |
8036 | ret = PTR_ERR(sqd); | |
8037 | goto err; | |
8038 | } | |
69fb2131 | 8039 | |
7c30f36a | 8040 | ctx->sq_creds = get_current_cred(); |
534ca6d6 | 8041 | ctx->sq_data = sqd; |
917257da JA |
8042 | ctx->sq_thread_idle = msecs_to_jiffies(p->sq_thread_idle); |
8043 | if (!ctx->sq_thread_idle) | |
8044 | ctx->sq_thread_idle = HZ; | |
8045 | ||
78d7f6ba | 8046 | io_sq_thread_park(sqd); |
de75a3d3 PB |
8047 | list_add(&ctx->sqd_list, &sqd->ctx_list); |
8048 | io_sqd_update_thread_idle(sqd); | |
26984fbf | 8049 | /* don't attach to a dying SQPOLL thread, would be racy */ |
f2a48dd0 | 8050 | ret = (attached && !sqd->thread) ? -ENXIO : 0; |
78d7f6ba PB |
8051 | io_sq_thread_unpark(sqd); |
8052 | ||
de75a3d3 PB |
8053 | if (ret < 0) |
8054 | goto err; | |
8055 | if (attached) | |
5aa75ed5 | 8056 | return 0; |
aa06165d | 8057 | |
6c271ce2 | 8058 | if (p->flags & IORING_SETUP_SQ_AFF) { |
44a9bd18 | 8059 | int cpu = p->sq_thread_cpu; |
6c271ce2 | 8060 | |
917257da | 8061 | ret = -EINVAL; |
f2a48dd0 | 8062 | if (cpu >= nr_cpu_ids || !cpu_online(cpu)) |
e8f98f24 | 8063 | goto err_sqpoll; |
37d1e2e3 | 8064 | sqd->sq_cpu = cpu; |
6c271ce2 | 8065 | } else { |
37d1e2e3 | 8066 | sqd->sq_cpu = -1; |
6c271ce2 | 8067 | } |
37d1e2e3 JA |
8068 | |
8069 | sqd->task_pid = current->pid; | |
5c2469e0 | 8070 | sqd->task_tgid = current->tgid; |
46fe18b1 JA |
8071 | tsk = create_io_thread(io_sq_thread, sqd, NUMA_NO_NODE); |
8072 | if (IS_ERR(tsk)) { | |
8073 | ret = PTR_ERR(tsk); | |
e8f98f24 | 8074 | goto err_sqpoll; |
6c271ce2 | 8075 | } |
97a73a0f | 8076 | |
46fe18b1 | 8077 | sqd->thread = tsk; |
97a73a0f | 8078 | ret = io_uring_alloc_task_context(tsk, ctx); |
46fe18b1 | 8079 | wake_up_new_task(tsk); |
0f212204 JA |
8080 | if (ret) |
8081 | goto err; | |
6c271ce2 JA |
8082 | } else if (p->flags & IORING_SETUP_SQ_AFF) { |
8083 | /* Can't have SQ_AFF without SQPOLL */ | |
8084 | ret = -EINVAL; | |
8085 | goto err; | |
8086 | } | |
8087 | ||
2b188cc1 | 8088 | return 0; |
f2a48dd0 PB |
8089 | err_sqpoll: |
8090 | complete(&ctx->sq_data->exited); | |
2b188cc1 | 8091 | err: |
37d1e2e3 | 8092 | io_sq_thread_finish(ctx); |
2b188cc1 JA |
8093 | return ret; |
8094 | } | |
8095 | ||
a087e2b5 BM |
8096 | static inline void __io_unaccount_mem(struct user_struct *user, |
8097 | unsigned long nr_pages) | |
2b188cc1 JA |
8098 | { |
8099 | atomic_long_sub(nr_pages, &user->locked_vm); | |
8100 | } | |
8101 | ||
a087e2b5 BM |
8102 | static inline int __io_account_mem(struct user_struct *user, |
8103 | unsigned long nr_pages) | |
2b188cc1 JA |
8104 | { |
8105 | unsigned long page_limit, cur_pages, new_pages; | |
8106 | ||
8107 | /* Don't allow more pages than we can safely lock */ | |
8108 | page_limit = rlimit(RLIMIT_MEMLOCK) >> PAGE_SHIFT; | |
8109 | ||
8110 | do { | |
8111 | cur_pages = atomic_long_read(&user->locked_vm); | |
8112 | new_pages = cur_pages + nr_pages; | |
8113 | if (new_pages > page_limit) | |
8114 | return -ENOMEM; | |
8115 | } while (atomic_long_cmpxchg(&user->locked_vm, cur_pages, | |
8116 | new_pages) != cur_pages); | |
8117 | ||
8118 | return 0; | |
8119 | } | |
8120 | ||
26bfa89e | 8121 | static void io_unaccount_mem(struct io_ring_ctx *ctx, unsigned long nr_pages) |
a087e2b5 | 8122 | { |
62e398be | 8123 | if (ctx->user) |
a087e2b5 | 8124 | __io_unaccount_mem(ctx->user, nr_pages); |
30975825 | 8125 | |
26bfa89e JA |
8126 | if (ctx->mm_account) |
8127 | atomic64_sub(nr_pages, &ctx->mm_account->pinned_vm); | |
a087e2b5 BM |
8128 | } |
8129 | ||
26bfa89e | 8130 | static int io_account_mem(struct io_ring_ctx *ctx, unsigned long nr_pages) |
a087e2b5 | 8131 | { |
30975825 BM |
8132 | int ret; |
8133 | ||
62e398be | 8134 | if (ctx->user) { |
30975825 BM |
8135 | ret = __io_account_mem(ctx->user, nr_pages); |
8136 | if (ret) | |
8137 | return ret; | |
8138 | } | |
8139 | ||
26bfa89e JA |
8140 | if (ctx->mm_account) |
8141 | atomic64_add(nr_pages, &ctx->mm_account->pinned_vm); | |
a087e2b5 BM |
8142 | |
8143 | return 0; | |
8144 | } | |
8145 | ||
2b188cc1 JA |
8146 | static void io_mem_free(void *ptr) |
8147 | { | |
52e04ef4 MR |
8148 | struct page *page; |
8149 | ||
8150 | if (!ptr) | |
8151 | return; | |
2b188cc1 | 8152 | |
52e04ef4 | 8153 | page = virt_to_head_page(ptr); |
2b188cc1 JA |
8154 | if (put_page_testzero(page)) |
8155 | free_compound_page(page); | |
8156 | } | |
8157 | ||
8158 | static void *io_mem_alloc(size_t size) | |
8159 | { | |
8160 | gfp_t gfp_flags = GFP_KERNEL | __GFP_ZERO | __GFP_NOWARN | __GFP_COMP | | |
26bfa89e | 8161 | __GFP_NORETRY | __GFP_ACCOUNT; |
2b188cc1 JA |
8162 | |
8163 | return (void *) __get_free_pages(gfp_flags, get_order(size)); | |
8164 | } | |
8165 | ||
75b28aff HV |
8166 | static unsigned long rings_size(unsigned sq_entries, unsigned cq_entries, |
8167 | size_t *sq_offset) | |
8168 | { | |
8169 | struct io_rings *rings; | |
8170 | size_t off, sq_array_size; | |
8171 | ||
8172 | off = struct_size(rings, cqes, cq_entries); | |
8173 | if (off == SIZE_MAX) | |
8174 | return SIZE_MAX; | |
8175 | ||
8176 | #ifdef CONFIG_SMP | |
8177 | off = ALIGN(off, SMP_CACHE_BYTES); | |
8178 | if (off == 0) | |
8179 | return SIZE_MAX; | |
8180 | #endif | |
8181 | ||
b36200f5 DV |
8182 | if (sq_offset) |
8183 | *sq_offset = off; | |
8184 | ||
75b28aff HV |
8185 | sq_array_size = array_size(sizeof(u32), sq_entries); |
8186 | if (sq_array_size == SIZE_MAX) | |
8187 | return SIZE_MAX; | |
8188 | ||
8189 | if (check_add_overflow(off, sq_array_size, &off)) | |
8190 | return SIZE_MAX; | |
8191 | ||
75b28aff HV |
8192 | return off; |
8193 | } | |
8194 | ||
41edf1a5 | 8195 | static void io_buffer_unmap(struct io_ring_ctx *ctx, struct io_mapped_ubuf **slot) |
7f61a1e9 | 8196 | { |
41edf1a5 | 8197 | struct io_mapped_ubuf *imu = *slot; |
7f61a1e9 PB |
8198 | unsigned int i; |
8199 | ||
6224843d PB |
8200 | if (imu != ctx->dummy_ubuf) { |
8201 | for (i = 0; i < imu->nr_bvecs; i++) | |
8202 | unpin_user_page(imu->bvec[i].bv_page); | |
8203 | if (imu->acct_pages) | |
8204 | io_unaccount_mem(ctx, imu->acct_pages); | |
8205 | kvfree(imu); | |
8206 | } | |
41edf1a5 | 8207 | *slot = NULL; |
7f61a1e9 PB |
8208 | } |
8209 | ||
bd54b6fe | 8210 | static void io_rsrc_buf_put(struct io_ring_ctx *ctx, struct io_rsrc_put *prsrc) |
edafccee | 8211 | { |
634d00df PB |
8212 | io_buffer_unmap(ctx, &prsrc->buf); |
8213 | prsrc->buf = NULL; | |
bd54b6fe | 8214 | } |
edafccee | 8215 | |
bd54b6fe BM |
8216 | static void __io_sqe_buffers_unregister(struct io_ring_ctx *ctx) |
8217 | { | |
8218 | unsigned int i; | |
edafccee | 8219 | |
7f61a1e9 PB |
8220 | for (i = 0; i < ctx->nr_user_bufs; i++) |
8221 | io_buffer_unmap(ctx, &ctx->user_bufs[i]); | |
edafccee | 8222 | kfree(ctx->user_bufs); |
bb6659cc | 8223 | io_rsrc_data_free(ctx->buf_data); |
edafccee | 8224 | ctx->user_bufs = NULL; |
bd54b6fe | 8225 | ctx->buf_data = NULL; |
edafccee | 8226 | ctx->nr_user_bufs = 0; |
bd54b6fe BM |
8227 | } |
8228 | ||
0a96bbe4 | 8229 | static int io_sqe_buffers_unregister(struct io_ring_ctx *ctx) |
edafccee | 8230 | { |
bd54b6fe | 8231 | int ret; |
edafccee | 8232 | |
bd54b6fe | 8233 | if (!ctx->buf_data) |
edafccee JA |
8234 | return -ENXIO; |
8235 | ||
bd54b6fe BM |
8236 | ret = io_rsrc_ref_quiesce(ctx->buf_data, ctx); |
8237 | if (!ret) | |
8238 | __io_sqe_buffers_unregister(ctx); | |
8239 | return ret; | |
edafccee JA |
8240 | } |
8241 | ||
8242 | static int io_copy_iov(struct io_ring_ctx *ctx, struct iovec *dst, | |
8243 | void __user *arg, unsigned index) | |
8244 | { | |
8245 | struct iovec __user *src; | |
8246 | ||
8247 | #ifdef CONFIG_COMPAT | |
8248 | if (ctx->compat) { | |
8249 | struct compat_iovec __user *ciovs; | |
8250 | struct compat_iovec ciov; | |
8251 | ||
8252 | ciovs = (struct compat_iovec __user *) arg; | |
8253 | if (copy_from_user(&ciov, &ciovs[index], sizeof(ciov))) | |
8254 | return -EFAULT; | |
8255 | ||
d55e5f5b | 8256 | dst->iov_base = u64_to_user_ptr((u64)ciov.iov_base); |
edafccee JA |
8257 | dst->iov_len = ciov.iov_len; |
8258 | return 0; | |
8259 | } | |
8260 | #endif | |
8261 | src = (struct iovec __user *) arg; | |
8262 | if (copy_from_user(dst, &src[index], sizeof(*dst))) | |
8263 | return -EFAULT; | |
8264 | return 0; | |
8265 | } | |
8266 | ||
de293938 JA |
8267 | /* |
8268 | * Not super efficient, but this is just a registration time. And we do cache | |
8269 | * the last compound head, so generally we'll only do a full search if we don't | |
8270 | * match that one. | |
8271 | * | |
8272 | * We check if the given compound head page has already been accounted, to | |
8273 | * avoid double accounting it. This allows us to account the full size of the | |
8274 | * page, not just the constituent pages of a huge page. | |
8275 | */ | |
8276 | static bool headpage_already_acct(struct io_ring_ctx *ctx, struct page **pages, | |
8277 | int nr_pages, struct page *hpage) | |
8278 | { | |
8279 | int i, j; | |
8280 | ||
8281 | /* check current page array */ | |
8282 | for (i = 0; i < nr_pages; i++) { | |
8283 | if (!PageCompound(pages[i])) | |
8284 | continue; | |
8285 | if (compound_head(pages[i]) == hpage) | |
8286 | return true; | |
8287 | } | |
8288 | ||
8289 | /* check previously registered pages */ | |
8290 | for (i = 0; i < ctx->nr_user_bufs; i++) { | |
41edf1a5 | 8291 | struct io_mapped_ubuf *imu = ctx->user_bufs[i]; |
de293938 JA |
8292 | |
8293 | for (j = 0; j < imu->nr_bvecs; j++) { | |
8294 | if (!PageCompound(imu->bvec[j].bv_page)) | |
8295 | continue; | |
8296 | if (compound_head(imu->bvec[j].bv_page) == hpage) | |
8297 | return true; | |
8298 | } | |
8299 | } | |
8300 | ||
8301 | return false; | |
8302 | } | |
8303 | ||
8304 | static int io_buffer_account_pin(struct io_ring_ctx *ctx, struct page **pages, | |
8305 | int nr_pages, struct io_mapped_ubuf *imu, | |
8306 | struct page **last_hpage) | |
8307 | { | |
8308 | int i, ret; | |
8309 | ||
216e5835 | 8310 | imu->acct_pages = 0; |
de293938 JA |
8311 | for (i = 0; i < nr_pages; i++) { |
8312 | if (!PageCompound(pages[i])) { | |
8313 | imu->acct_pages++; | |
8314 | } else { | |
8315 | struct page *hpage; | |
8316 | ||
8317 | hpage = compound_head(pages[i]); | |
8318 | if (hpage == *last_hpage) | |
8319 | continue; | |
8320 | *last_hpage = hpage; | |
8321 | if (headpage_already_acct(ctx, pages, i, hpage)) | |
8322 | continue; | |
8323 | imu->acct_pages += page_size(hpage) >> PAGE_SHIFT; | |
8324 | } | |
8325 | } | |
8326 | ||
8327 | if (!imu->acct_pages) | |
8328 | return 0; | |
8329 | ||
26bfa89e | 8330 | ret = io_account_mem(ctx, imu->acct_pages); |
de293938 JA |
8331 | if (ret) |
8332 | imu->acct_pages = 0; | |
8333 | return ret; | |
8334 | } | |
8335 | ||
0a96bbe4 | 8336 | static int io_sqe_buffer_register(struct io_ring_ctx *ctx, struct iovec *iov, |
41edf1a5 | 8337 | struct io_mapped_ubuf **pimu, |
0a96bbe4 | 8338 | struct page **last_hpage) |
edafccee | 8339 | { |
41edf1a5 | 8340 | struct io_mapped_ubuf *imu = NULL; |
edafccee JA |
8341 | struct vm_area_struct **vmas = NULL; |
8342 | struct page **pages = NULL; | |
0a96bbe4 BM |
8343 | unsigned long off, start, end, ubuf; |
8344 | size_t size; | |
8345 | int ret, pret, nr_pages, i; | |
8346 | ||
6224843d PB |
8347 | if (!iov->iov_base) { |
8348 | *pimu = ctx->dummy_ubuf; | |
8349 | return 0; | |
8350 | } | |
8351 | ||
0a96bbe4 BM |
8352 | ubuf = (unsigned long) iov->iov_base; |
8353 | end = (ubuf + iov->iov_len + PAGE_SIZE - 1) >> PAGE_SHIFT; | |
8354 | start = ubuf >> PAGE_SHIFT; | |
8355 | nr_pages = end - start; | |
8356 | ||
41edf1a5 | 8357 | *pimu = NULL; |
0a96bbe4 BM |
8358 | ret = -ENOMEM; |
8359 | ||
8360 | pages = kvmalloc_array(nr_pages, sizeof(struct page *), GFP_KERNEL); | |
8361 | if (!pages) | |
8362 | goto done; | |
8363 | ||
8364 | vmas = kvmalloc_array(nr_pages, sizeof(struct vm_area_struct *), | |
8365 | GFP_KERNEL); | |
8366 | if (!vmas) | |
8367 | goto done; | |
edafccee | 8368 | |
41edf1a5 | 8369 | imu = kvmalloc(struct_size(imu, bvec, nr_pages), GFP_KERNEL); |
a2b4198c | 8370 | if (!imu) |
0a96bbe4 BM |
8371 | goto done; |
8372 | ||
8373 | ret = 0; | |
8374 | mmap_read_lock(current->mm); | |
8375 | pret = pin_user_pages(ubuf, nr_pages, FOLL_WRITE | FOLL_LONGTERM, | |
8376 | pages, vmas); | |
8377 | if (pret == nr_pages) { | |
8378 | /* don't support file backed memory */ | |
8379 | for (i = 0; i < nr_pages; i++) { | |
8380 | struct vm_area_struct *vma = vmas[i]; | |
8381 | ||
40dad765 PB |
8382 | if (vma_is_shmem(vma)) |
8383 | continue; | |
0a96bbe4 BM |
8384 | if (vma->vm_file && |
8385 | !is_file_hugepages(vma->vm_file)) { | |
8386 | ret = -EOPNOTSUPP; | |
8387 | break; | |
8388 | } | |
8389 | } | |
8390 | } else { | |
8391 | ret = pret < 0 ? pret : -EFAULT; | |
8392 | } | |
8393 | mmap_read_unlock(current->mm); | |
8394 | if (ret) { | |
8395 | /* | |
8396 | * if we did partial map, or found file backed vmas, | |
8397 | * release any pages we did get | |
8398 | */ | |
8399 | if (pret > 0) | |
8400 | unpin_user_pages(pages, pret); | |
0a96bbe4 BM |
8401 | goto done; |
8402 | } | |
8403 | ||
8404 | ret = io_buffer_account_pin(ctx, pages, pret, imu, last_hpage); | |
8405 | if (ret) { | |
8406 | unpin_user_pages(pages, pret); | |
0a96bbe4 BM |
8407 | goto done; |
8408 | } | |
8409 | ||
8410 | off = ubuf & ~PAGE_MASK; | |
8411 | size = iov->iov_len; | |
8412 | for (i = 0; i < nr_pages; i++) { | |
8413 | size_t vec_len; | |
8414 | ||
8415 | vec_len = min_t(size_t, size, PAGE_SIZE - off); | |
8416 | imu->bvec[i].bv_page = pages[i]; | |
8417 | imu->bvec[i].bv_len = vec_len; | |
8418 | imu->bvec[i].bv_offset = off; | |
8419 | off = 0; | |
8420 | size -= vec_len; | |
8421 | } | |
8422 | /* store original address for later verification */ | |
8423 | imu->ubuf = ubuf; | |
4751f53d | 8424 | imu->ubuf_end = ubuf + iov->iov_len; |
0a96bbe4 | 8425 | imu->nr_bvecs = nr_pages; |
41edf1a5 | 8426 | *pimu = imu; |
0a96bbe4 BM |
8427 | ret = 0; |
8428 | done: | |
41edf1a5 PB |
8429 | if (ret) |
8430 | kvfree(imu); | |
0a96bbe4 BM |
8431 | kvfree(pages); |
8432 | kvfree(vmas); | |
8433 | return ret; | |
8434 | } | |
8435 | ||
2b358604 | 8436 | static int io_buffers_map_alloc(struct io_ring_ctx *ctx, unsigned int nr_args) |
0a96bbe4 | 8437 | { |
87094465 PB |
8438 | ctx->user_bufs = kcalloc(nr_args, sizeof(*ctx->user_bufs), GFP_KERNEL); |
8439 | return ctx->user_bufs ? 0 : -ENOMEM; | |
2b358604 | 8440 | } |
edafccee | 8441 | |
2b358604 BM |
8442 | static int io_buffer_validate(struct iovec *iov) |
8443 | { | |
50e96989 PB |
8444 | unsigned long tmp, acct_len = iov->iov_len + (PAGE_SIZE - 1); |
8445 | ||
2b358604 BM |
8446 | /* |
8447 | * Don't impose further limits on the size and buffer | |
8448 | * constraints here, we'll -EINVAL later when IO is | |
8449 | * submitted if they are wrong. | |
8450 | */ | |
6224843d PB |
8451 | if (!iov->iov_base) |
8452 | return iov->iov_len ? -EFAULT : 0; | |
8453 | if (!iov->iov_len) | |
2b358604 | 8454 | return -EFAULT; |
edafccee | 8455 | |
2b358604 BM |
8456 | /* arbitrary limit, but we need something */ |
8457 | if (iov->iov_len > SZ_1G) | |
8458 | return -EFAULT; | |
edafccee | 8459 | |
50e96989 PB |
8460 | if (check_add_overflow((unsigned long)iov->iov_base, acct_len, &tmp)) |
8461 | return -EOVERFLOW; | |
8462 | ||
2b358604 BM |
8463 | return 0; |
8464 | } | |
edafccee | 8465 | |
2b358604 | 8466 | static int io_sqe_buffers_register(struct io_ring_ctx *ctx, void __user *arg, |
634d00df | 8467 | unsigned int nr_args, u64 __user *tags) |
2b358604 | 8468 | { |
bd54b6fe BM |
8469 | struct page *last_hpage = NULL; |
8470 | struct io_rsrc_data *data; | |
2b358604 BM |
8471 | int i, ret; |
8472 | struct iovec iov; | |
edafccee | 8473 | |
87094465 PB |
8474 | if (ctx->user_bufs) |
8475 | return -EBUSY; | |
489809e2 | 8476 | if (!nr_args || nr_args > IORING_MAX_REG_BUFFERS) |
87094465 | 8477 | return -EINVAL; |
bd54b6fe | 8478 | ret = io_rsrc_node_switch_start(ctx); |
2b358604 BM |
8479 | if (ret) |
8480 | return ret; | |
d878c816 PB |
8481 | ret = io_rsrc_data_alloc(ctx, io_rsrc_buf_put, tags, nr_args, &data); |
8482 | if (ret) | |
8483 | return ret; | |
bd54b6fe BM |
8484 | ret = io_buffers_map_alloc(ctx, nr_args); |
8485 | if (ret) { | |
bb6659cc | 8486 | io_rsrc_data_free(data); |
bd54b6fe BM |
8487 | return ret; |
8488 | } | |
edafccee | 8489 | |
87094465 | 8490 | for (i = 0; i < nr_args; i++, ctx->nr_user_bufs++) { |
edafccee JA |
8491 | ret = io_copy_iov(ctx, &iov, arg, i); |
8492 | if (ret) | |
0a96bbe4 | 8493 | break; |
2b358604 BM |
8494 | ret = io_buffer_validate(&iov); |
8495 | if (ret) | |
0a96bbe4 | 8496 | break; |
2d091d62 | 8497 | if (!iov.iov_base && *io_get_tag_slot(data, i)) { |
cf3770e7 CIK |
8498 | ret = -EINVAL; |
8499 | break; | |
8500 | } | |
edafccee | 8501 | |
41edf1a5 PB |
8502 | ret = io_sqe_buffer_register(ctx, &iov, &ctx->user_bufs[i], |
8503 | &last_hpage); | |
0a96bbe4 BM |
8504 | if (ret) |
8505 | break; | |
edafccee | 8506 | } |
0a96bbe4 | 8507 | |
bd54b6fe | 8508 | WARN_ON_ONCE(ctx->buf_data); |
0a96bbe4 | 8509 | |
bd54b6fe BM |
8510 | ctx->buf_data = data; |
8511 | if (ret) | |
8512 | __io_sqe_buffers_unregister(ctx); | |
8513 | else | |
8514 | io_rsrc_node_switch(ctx, NULL); | |
edafccee JA |
8515 | return ret; |
8516 | } | |
8517 | ||
634d00df PB |
8518 | static int __io_sqe_buffers_update(struct io_ring_ctx *ctx, |
8519 | struct io_uring_rsrc_update2 *up, | |
8520 | unsigned int nr_args) | |
8521 | { | |
8522 | u64 __user *tags = u64_to_user_ptr(up->tags); | |
8523 | struct iovec iov, __user *iovs = u64_to_user_ptr(up->data); | |
634d00df PB |
8524 | struct page *last_hpage = NULL; |
8525 | bool needs_switch = false; | |
8526 | __u32 done; | |
8527 | int i, err; | |
8528 | ||
8529 | if (!ctx->buf_data) | |
8530 | return -ENXIO; | |
8531 | if (up->offset + nr_args > ctx->nr_user_bufs) | |
8532 | return -EINVAL; | |
8533 | ||
8534 | for (done = 0; done < nr_args; done++) { | |
0b8c0e7c PB |
8535 | struct io_mapped_ubuf *imu; |
8536 | int offset = up->offset + done; | |
634d00df PB |
8537 | u64 tag = 0; |
8538 | ||
8539 | err = io_copy_iov(ctx, &iov, iovs, done); | |
8540 | if (err) | |
8541 | break; | |
8542 | if (tags && copy_from_user(&tag, &tags[done], sizeof(tag))) { | |
8543 | err = -EFAULT; | |
8544 | break; | |
8545 | } | |
0b8c0e7c PB |
8546 | err = io_buffer_validate(&iov); |
8547 | if (err) | |
8548 | break; | |
cf3770e7 CIK |
8549 | if (!iov.iov_base && tag) { |
8550 | err = -EINVAL; | |
8551 | break; | |
8552 | } | |
0b8c0e7c PB |
8553 | err = io_sqe_buffer_register(ctx, &iov, &imu, &last_hpage); |
8554 | if (err) | |
8555 | break; | |
634d00df | 8556 | |
0b8c0e7c | 8557 | i = array_index_nospec(offset, ctx->nr_user_bufs); |
6224843d | 8558 | if (ctx->user_bufs[i] != ctx->dummy_ubuf) { |
0b8c0e7c PB |
8559 | err = io_queue_rsrc_removal(ctx->buf_data, offset, |
8560 | ctx->rsrc_node, ctx->user_bufs[i]); | |
8561 | if (unlikely(err)) { | |
8562 | io_buffer_unmap(ctx, &imu); | |
634d00df | 8563 | break; |
0b8c0e7c | 8564 | } |
634d00df PB |
8565 | ctx->user_bufs[i] = NULL; |
8566 | needs_switch = true; | |
8567 | } | |
8568 | ||
0b8c0e7c | 8569 | ctx->user_bufs[i] = imu; |
2d091d62 | 8570 | *io_get_tag_slot(ctx->buf_data, offset) = tag; |
634d00df PB |
8571 | } |
8572 | ||
8573 | if (needs_switch) | |
8574 | io_rsrc_node_switch(ctx, ctx->buf_data); | |
8575 | return done ? done : err; | |
8576 | } | |
8577 | ||
9b402849 JA |
8578 | static int io_eventfd_register(struct io_ring_ctx *ctx, void __user *arg) |
8579 | { | |
8580 | __s32 __user *fds = arg; | |
8581 | int fd; | |
8582 | ||
8583 | if (ctx->cq_ev_fd) | |
8584 | return -EBUSY; | |
8585 | ||
8586 | if (copy_from_user(&fd, fds, sizeof(*fds))) | |
8587 | return -EFAULT; | |
8588 | ||
8589 | ctx->cq_ev_fd = eventfd_ctx_fdget(fd); | |
8590 | if (IS_ERR(ctx->cq_ev_fd)) { | |
8591 | int ret = PTR_ERR(ctx->cq_ev_fd); | |
fe7e3257 | 8592 | |
9b402849 JA |
8593 | ctx->cq_ev_fd = NULL; |
8594 | return ret; | |
8595 | } | |
8596 | ||
8597 | return 0; | |
8598 | } | |
8599 | ||
8600 | static int io_eventfd_unregister(struct io_ring_ctx *ctx) | |
8601 | { | |
8602 | if (ctx->cq_ev_fd) { | |
8603 | eventfd_ctx_put(ctx->cq_ev_fd); | |
8604 | ctx->cq_ev_fd = NULL; | |
8605 | return 0; | |
8606 | } | |
8607 | ||
8608 | return -ENXIO; | |
8609 | } | |
8610 | ||
5a2e745d JA |
8611 | static void io_destroy_buffers(struct io_ring_ctx *ctx) |
8612 | { | |
9e15c3a0 JA |
8613 | struct io_buffer *buf; |
8614 | unsigned long index; | |
8615 | ||
8616 | xa_for_each(&ctx->io_buffers, index, buf) | |
8617 | __io_remove_buffers(ctx, buf, index, -1U); | |
5a2e745d JA |
8618 | } |
8619 | ||
68e68ee6 | 8620 | static void io_req_cache_free(struct list_head *list, struct task_struct *tsk) |
1b4c351f | 8621 | { |
68e68ee6 | 8622 | struct io_kiocb *req, *nxt; |
1b4c351f | 8623 | |
68e68ee6 JA |
8624 | list_for_each_entry_safe(req, nxt, list, compl.list) { |
8625 | if (tsk && req->task != tsk) | |
8626 | continue; | |
1b4c351f JA |
8627 | list_del(&req->compl.list); |
8628 | kmem_cache_free(req_cachep, req); | |
8629 | } | |
8630 | } | |
8631 | ||
4010fec4 | 8632 | static void io_req_caches_free(struct io_ring_ctx *ctx) |
2b188cc1 | 8633 | { |
bf019da7 | 8634 | struct io_submit_state *submit_state = &ctx->submit_state; |
e5547d2c | 8635 | struct io_comp_state *cs = &ctx->submit_state.comp; |
bf019da7 | 8636 | |
9a4fdbd8 JA |
8637 | mutex_lock(&ctx->uring_lock); |
8638 | ||
8e5c66c4 | 8639 | if (submit_state->free_reqs) { |
9a4fdbd8 JA |
8640 | kmem_cache_free_bulk(req_cachep, submit_state->free_reqs, |
8641 | submit_state->reqs); | |
8e5c66c4 PB |
8642 | submit_state->free_reqs = 0; |
8643 | } | |
9a4fdbd8 | 8644 | |
dac7a098 | 8645 | io_flush_cached_locked_reqs(ctx, cs); |
e5547d2c | 8646 | io_req_cache_free(&cs->free_list, NULL); |
9a4fdbd8 JA |
8647 | mutex_unlock(&ctx->uring_lock); |
8648 | } | |
8649 | ||
43597aac | 8650 | static void io_wait_rsrc_data(struct io_rsrc_data *data) |
2b188cc1 | 8651 | { |
43597aac | 8652 | if (data && !atomic_dec_and_test(&data->refs)) |
bd54b6fe | 8653 | wait_for_completion(&data->done); |
bd54b6fe | 8654 | } |
04fc6c80 | 8655 | |
2b188cc1 JA |
8656 | static void io_ring_ctx_free(struct io_ring_ctx *ctx) |
8657 | { | |
37d1e2e3 | 8658 | io_sq_thread_finish(ctx); |
2aede0e4 | 8659 | |
37d1e2e3 | 8660 | if (ctx->mm_account) { |
2aede0e4 JA |
8661 | mmdrop(ctx->mm_account); |
8662 | ctx->mm_account = NULL; | |
30975825 | 8663 | } |
def596e9 | 8664 | |
43597aac PB |
8665 | /* __io_rsrc_put_work() may need uring_lock to progress, wait w/o it */ |
8666 | io_wait_rsrc_data(ctx->buf_data); | |
8667 | io_wait_rsrc_data(ctx->file_data); | |
8668 | ||
8bad28d8 | 8669 | mutex_lock(&ctx->uring_lock); |
43597aac | 8670 | if (ctx->buf_data) |
bd54b6fe | 8671 | __io_sqe_buffers_unregister(ctx); |
43597aac | 8672 | if (ctx->file_data) |
08480400 | 8673 | __io_sqe_files_unregister(ctx); |
c4ea060e PB |
8674 | if (ctx->rings) |
8675 | __io_cqring_overflow_flush(ctx, true); | |
8bad28d8 | 8676 | mutex_unlock(&ctx->uring_lock); |
9b402849 | 8677 | io_eventfd_unregister(ctx); |
5a2e745d | 8678 | io_destroy_buffers(ctx); |
07db298a PB |
8679 | if (ctx->sq_creds) |
8680 | put_cred(ctx->sq_creds); | |
def596e9 | 8681 | |
a7f0ed5a PB |
8682 | /* there are no registered resources left, nobody uses it */ |
8683 | if (ctx->rsrc_node) | |
8684 | io_rsrc_node_destroy(ctx->rsrc_node); | |
8dd03afe | 8685 | if (ctx->rsrc_backup_node) |
b895c9a6 | 8686 | io_rsrc_node_destroy(ctx->rsrc_backup_node); |
a7f0ed5a PB |
8687 | flush_delayed_work(&ctx->rsrc_put_work); |
8688 | ||
8689 | WARN_ON_ONCE(!list_empty(&ctx->rsrc_ref_list)); | |
8690 | WARN_ON_ONCE(!llist_empty(&ctx->rsrc_put_llist)); | |
def596e9 | 8691 | |
2b188cc1 | 8692 | #if defined(CONFIG_UNIX) |
355e8d26 EB |
8693 | if (ctx->ring_sock) { |
8694 | ctx->ring_sock->file = NULL; /* so that iput() is called */ | |
2b188cc1 | 8695 | sock_release(ctx->ring_sock); |
355e8d26 | 8696 | } |
2b188cc1 JA |
8697 | #endif |
8698 | ||
75b28aff | 8699 | io_mem_free(ctx->rings); |
2b188cc1 | 8700 | io_mem_free(ctx->sq_sqes); |
2b188cc1 JA |
8701 | |
8702 | percpu_ref_exit(&ctx->refs); | |
2b188cc1 | 8703 | free_uid(ctx->user); |
4010fec4 | 8704 | io_req_caches_free(ctx); |
e941894e JA |
8705 | if (ctx->hash_map) |
8706 | io_wq_put_hash(ctx->hash_map); | |
78076bb6 | 8707 | kfree(ctx->cancel_hash); |
6224843d | 8708 | kfree(ctx->dummy_ubuf); |
2b188cc1 JA |
8709 | kfree(ctx); |
8710 | } | |
8711 | ||
8712 | static __poll_t io_uring_poll(struct file *file, poll_table *wait) | |
8713 | { | |
8714 | struct io_ring_ctx *ctx = file->private_data; | |
8715 | __poll_t mask = 0; | |
8716 | ||
311997b3 | 8717 | poll_wait(file, &ctx->poll_wait, wait); |
4f7067c3 SB |
8718 | /* |
8719 | * synchronizes with barrier from wq_has_sleeper call in | |
8720 | * io_commit_cqring | |
8721 | */ | |
2b188cc1 | 8722 | smp_rmb(); |
90554200 | 8723 | if (!io_sqring_full(ctx)) |
2b188cc1 | 8724 | mask |= EPOLLOUT | EPOLLWRNORM; |
ed670c3f HX |
8725 | |
8726 | /* | |
8727 | * Don't flush cqring overflow list here, just do a simple check. | |
8728 | * Otherwise there could possible be ABBA deadlock: | |
8729 | * CPU0 CPU1 | |
8730 | * ---- ---- | |
8731 | * lock(&ctx->uring_lock); | |
8732 | * lock(&ep->mtx); | |
8733 | * lock(&ctx->uring_lock); | |
8734 | * lock(&ep->mtx); | |
8735 | * | |
8736 | * Users may get EPOLLIN meanwhile seeing nothing in cqring, this | |
8737 | * pushs them to do the flush. | |
8738 | */ | |
5ed7a37d | 8739 | if (io_cqring_events(ctx) || test_bit(0, &ctx->check_cq_overflow)) |
2b188cc1 JA |
8740 | mask |= EPOLLIN | EPOLLRDNORM; |
8741 | ||
8742 | return mask; | |
8743 | } | |
8744 | ||
8745 | static int io_uring_fasync(int fd, struct file *file, int on) | |
8746 | { | |
8747 | struct io_ring_ctx *ctx = file->private_data; | |
8748 | ||
8749 | return fasync_helper(fd, file, on, &ctx->cq_fasync); | |
8750 | } | |
8751 | ||
0bead8cd | 8752 | static int io_unregister_personality(struct io_ring_ctx *ctx, unsigned id) |
071698e1 | 8753 | { |
4379bf8b | 8754 | const struct cred *creds; |
071698e1 | 8755 | |
61cf9370 | 8756 | creds = xa_erase(&ctx->personalities, id); |
4379bf8b JA |
8757 | if (creds) { |
8758 | put_cred(creds); | |
0bead8cd | 8759 | return 0; |
1e6fa521 | 8760 | } |
0bead8cd YD |
8761 | |
8762 | return -EINVAL; | |
8763 | } | |
8764 | ||
d56d938b PB |
8765 | struct io_tctx_exit { |
8766 | struct callback_head task_work; | |
8767 | struct completion completion; | |
baf186c4 | 8768 | struct io_ring_ctx *ctx; |
d56d938b PB |
8769 | }; |
8770 | ||
8771 | static void io_tctx_exit_cb(struct callback_head *cb) | |
8772 | { | |
8773 | struct io_uring_task *tctx = current->io_uring; | |
8774 | struct io_tctx_exit *work; | |
8775 | ||
8776 | work = container_of(cb, struct io_tctx_exit, task_work); | |
8777 | /* | |
8778 | * When @in_idle, we're in cancellation and it's racy to remove the | |
8779 | * node. It'll be removed by the end of cancellation, just ignore it. | |
8780 | */ | |
8781 | if (!atomic_read(&tctx->in_idle)) | |
eef51daa | 8782 | io_uring_del_tctx_node((unsigned long)work->ctx); |
d56d938b PB |
8783 | complete(&work->completion); |
8784 | } | |
8785 | ||
28090c13 PB |
8786 | static bool io_cancel_ctx_cb(struct io_wq_work *work, void *data) |
8787 | { | |
8788 | struct io_kiocb *req = container_of(work, struct io_kiocb, work); | |
8789 | ||
8790 | return req->ctx == data; | |
8791 | } | |
8792 | ||
85faa7b8 JA |
8793 | static void io_ring_exit_work(struct work_struct *work) |
8794 | { | |
d56d938b | 8795 | struct io_ring_ctx *ctx = container_of(work, struct io_ring_ctx, exit_work); |
b5bb3a24 | 8796 | unsigned long timeout = jiffies + HZ * 60 * 5; |
58d3be2c | 8797 | unsigned long interval = HZ / 20; |
d56d938b PB |
8798 | struct io_tctx_exit exit; |
8799 | struct io_tctx_node *node; | |
8800 | int ret; | |
85faa7b8 | 8801 | |
56952e91 JA |
8802 | /* |
8803 | * If we're doing polled IO and end up having requests being | |
8804 | * submitted async (out-of-line), then completions can come in while | |
8805 | * we're waiting for refs to drop. We need to reap these manually, | |
8806 | * as nobody else will be looking for them. | |
8807 | */ | |
b2edc0a7 | 8808 | do { |
3dd0c97a | 8809 | io_uring_try_cancel_requests(ctx, NULL, true); |
28090c13 PB |
8810 | if (ctx->sq_data) { |
8811 | struct io_sq_data *sqd = ctx->sq_data; | |
8812 | struct task_struct *tsk; | |
8813 | ||
8814 | io_sq_thread_park(sqd); | |
8815 | tsk = sqd->thread; | |
8816 | if (tsk && tsk->io_uring && tsk->io_uring->io_wq) | |
8817 | io_wq_cancel_cb(tsk->io_uring->io_wq, | |
8818 | io_cancel_ctx_cb, ctx, true); | |
8819 | io_sq_thread_unpark(sqd); | |
8820 | } | |
b5bb3a24 | 8821 | |
58d3be2c PB |
8822 | if (WARN_ON_ONCE(time_after(jiffies, timeout))) { |
8823 | /* there is little hope left, don't run it too often */ | |
8824 | interval = HZ * 60; | |
8825 | } | |
8826 | } while (!wait_for_completion_timeout(&ctx->ref_comp, interval)); | |
d56d938b | 8827 | |
7f00651a PB |
8828 | init_completion(&exit.completion); |
8829 | init_task_work(&exit.task_work, io_tctx_exit_cb); | |
8830 | exit.ctx = ctx; | |
89b5066e PB |
8831 | /* |
8832 | * Some may use context even when all refs and requests have been put, | |
8833 | * and they are free to do so while still holding uring_lock or | |
5b0a6acc | 8834 | * completion_lock, see io_req_task_submit(). Apart from other work, |
89b5066e PB |
8835 | * this lock/unlock section also waits them to finish. |
8836 | */ | |
d56d938b PB |
8837 | mutex_lock(&ctx->uring_lock); |
8838 | while (!list_empty(&ctx->tctx_list)) { | |
b5bb3a24 PB |
8839 | WARN_ON_ONCE(time_after(jiffies, timeout)); |
8840 | ||
d56d938b PB |
8841 | node = list_first_entry(&ctx->tctx_list, struct io_tctx_node, |
8842 | ctx_node); | |
7f00651a PB |
8843 | /* don't spin on a single task if cancellation failed */ |
8844 | list_rotate_left(&ctx->tctx_list); | |
d56d938b PB |
8845 | ret = task_work_add(node->task, &exit.task_work, TWA_SIGNAL); |
8846 | if (WARN_ON_ONCE(ret)) | |
8847 | continue; | |
8848 | wake_up_process(node->task); | |
8849 | ||
8850 | mutex_unlock(&ctx->uring_lock); | |
8851 | wait_for_completion(&exit.completion); | |
d56d938b PB |
8852 | mutex_lock(&ctx->uring_lock); |
8853 | } | |
8854 | mutex_unlock(&ctx->uring_lock); | |
89b5066e PB |
8855 | spin_lock_irq(&ctx->completion_lock); |
8856 | spin_unlock_irq(&ctx->completion_lock); | |
d56d938b | 8857 | |
85faa7b8 JA |
8858 | io_ring_ctx_free(ctx); |
8859 | } | |
8860 | ||
80c4cbdb PB |
8861 | /* Returns true if we found and killed one or more timeouts */ |
8862 | static bool io_kill_timeouts(struct io_ring_ctx *ctx, struct task_struct *tsk, | |
3dd0c97a | 8863 | bool cancel_all) |
80c4cbdb PB |
8864 | { |
8865 | struct io_kiocb *req, *tmp; | |
8866 | int canceled = 0; | |
8867 | ||
8868 | spin_lock_irq(&ctx->completion_lock); | |
8869 | list_for_each_entry_safe(req, tmp, &ctx->timeout_list, timeout.list) { | |
3dd0c97a | 8870 | if (io_match_task(req, tsk, cancel_all)) { |
80c4cbdb PB |
8871 | io_kill_timeout(req, -ECANCELED); |
8872 | canceled++; | |
8873 | } | |
8874 | } | |
51520426 PB |
8875 | if (canceled != 0) |
8876 | io_commit_cqring(ctx); | |
80c4cbdb | 8877 | spin_unlock_irq(&ctx->completion_lock); |
80c4cbdb PB |
8878 | if (canceled != 0) |
8879 | io_cqring_ev_posted(ctx); | |
8880 | return canceled != 0; | |
8881 | } | |
8882 | ||
2b188cc1 JA |
8883 | static void io_ring_ctx_wait_and_kill(struct io_ring_ctx *ctx) |
8884 | { | |
61cf9370 MWO |
8885 | unsigned long index; |
8886 | struct creds *creds; | |
8887 | ||
2b188cc1 JA |
8888 | mutex_lock(&ctx->uring_lock); |
8889 | percpu_ref_kill(&ctx->refs); | |
634578f8 | 8890 | if (ctx->rings) |
6c2450ae | 8891 | __io_cqring_overflow_flush(ctx, true); |
61cf9370 MWO |
8892 | xa_for_each(&ctx->personalities, index, creds) |
8893 | io_unregister_personality(ctx, index); | |
2b188cc1 JA |
8894 | mutex_unlock(&ctx->uring_lock); |
8895 | ||
3dd0c97a PB |
8896 | io_kill_timeouts(ctx, NULL, true); |
8897 | io_poll_remove_all(ctx, NULL, true); | |
561fb04a | 8898 | |
15dff286 | 8899 | /* if we failed setting up the ctx, we might not have any rings */ |
b2edc0a7 | 8900 | io_iopoll_try_reap_events(ctx); |
309fc03a | 8901 | |
85faa7b8 | 8902 | INIT_WORK(&ctx->exit_work, io_ring_exit_work); |
fc666777 JA |
8903 | /* |
8904 | * Use system_unbound_wq to avoid spawning tons of event kworkers | |
8905 | * if we're exiting a ton of rings at the same time. It just adds | |
8906 | * noise and overhead, there's no discernable change in runtime | |
8907 | * over using system_wq. | |
8908 | */ | |
8909 | queue_work(system_unbound_wq, &ctx->exit_work); | |
2b188cc1 JA |
8910 | } |
8911 | ||
8912 | static int io_uring_release(struct inode *inode, struct file *file) | |
8913 | { | |
8914 | struct io_ring_ctx *ctx = file->private_data; | |
8915 | ||
8916 | file->private_data = NULL; | |
8917 | io_ring_ctx_wait_and_kill(ctx); | |
8918 | return 0; | |
8919 | } | |
8920 | ||
f6edbabb PB |
8921 | struct io_task_cancel { |
8922 | struct task_struct *task; | |
3dd0c97a | 8923 | bool all; |
f6edbabb | 8924 | }; |
f254ac04 | 8925 | |
f6edbabb | 8926 | static bool io_cancel_task_cb(struct io_wq_work *work, void *data) |
b711d4ea | 8927 | { |
9a472ef7 | 8928 | struct io_kiocb *req = container_of(work, struct io_kiocb, work); |
f6edbabb | 8929 | struct io_task_cancel *cancel = data; |
9a472ef7 PB |
8930 | bool ret; |
8931 | ||
3dd0c97a | 8932 | if (!cancel->all && (req->flags & REQ_F_LINK_TIMEOUT)) { |
9a472ef7 PB |
8933 | unsigned long flags; |
8934 | struct io_ring_ctx *ctx = req->ctx; | |
8935 | ||
8936 | /* protect against races with linked timeouts */ | |
8937 | spin_lock_irqsave(&ctx->completion_lock, flags); | |
3dd0c97a | 8938 | ret = io_match_task(req, cancel->task, cancel->all); |
9a472ef7 PB |
8939 | spin_unlock_irqrestore(&ctx->completion_lock, flags); |
8940 | } else { | |
3dd0c97a | 8941 | ret = io_match_task(req, cancel->task, cancel->all); |
9a472ef7 PB |
8942 | } |
8943 | return ret; | |
b711d4ea JA |
8944 | } |
8945 | ||
e1915f76 | 8946 | static bool io_cancel_defer_files(struct io_ring_ctx *ctx, |
3dd0c97a | 8947 | struct task_struct *task, bool cancel_all) |
b7ddce3c | 8948 | { |
e1915f76 | 8949 | struct io_defer_entry *de; |
b7ddce3c PB |
8950 | LIST_HEAD(list); |
8951 | ||
8952 | spin_lock_irq(&ctx->completion_lock); | |
8953 | list_for_each_entry_reverse(de, &ctx->defer_list, list) { | |
3dd0c97a | 8954 | if (io_match_task(de->req, task, cancel_all)) { |
b7ddce3c PB |
8955 | list_cut_position(&list, &ctx->defer_list, &de->list); |
8956 | break; | |
8957 | } | |
8958 | } | |
8959 | spin_unlock_irq(&ctx->completion_lock); | |
e1915f76 PB |
8960 | if (list_empty(&list)) |
8961 | return false; | |
b7ddce3c PB |
8962 | |
8963 | while (!list_empty(&list)) { | |
8964 | de = list_first_entry(&list, struct io_defer_entry, list); | |
8965 | list_del_init(&de->list); | |
f41db273 | 8966 | io_req_complete_failed(de->req, -ECANCELED); |
b7ddce3c PB |
8967 | kfree(de); |
8968 | } | |
e1915f76 | 8969 | return true; |
b7ddce3c PB |
8970 | } |
8971 | ||
1b00764f PB |
8972 | static bool io_uring_try_cancel_iowq(struct io_ring_ctx *ctx) |
8973 | { | |
8974 | struct io_tctx_node *node; | |
8975 | enum io_wq_cancel cret; | |
8976 | bool ret = false; | |
8977 | ||
8978 | mutex_lock(&ctx->uring_lock); | |
8979 | list_for_each_entry(node, &ctx->tctx_list, ctx_node) { | |
8980 | struct io_uring_task *tctx = node->task->io_uring; | |
8981 | ||
8982 | /* | |
8983 | * io_wq will stay alive while we hold uring_lock, because it's | |
8984 | * killed after ctx nodes, which requires to take the lock. | |
8985 | */ | |
8986 | if (!tctx || !tctx->io_wq) | |
8987 | continue; | |
8988 | cret = io_wq_cancel_cb(tctx->io_wq, io_cancel_ctx_cb, ctx, true); | |
8989 | ret |= (cret != IO_WQ_CANCEL_NOTFOUND); | |
8990 | } | |
8991 | mutex_unlock(&ctx->uring_lock); | |
8992 | ||
8993 | return ret; | |
8994 | } | |
8995 | ||
9936c7c2 PB |
8996 | static void io_uring_try_cancel_requests(struct io_ring_ctx *ctx, |
8997 | struct task_struct *task, | |
3dd0c97a | 8998 | bool cancel_all) |
9936c7c2 | 8999 | { |
3dd0c97a | 9000 | struct io_task_cancel cancel = { .task = task, .all = cancel_all, }; |
1b00764f | 9001 | struct io_uring_task *tctx = task ? task->io_uring : NULL; |
9936c7c2 PB |
9002 | |
9003 | while (1) { | |
9004 | enum io_wq_cancel cret; | |
9005 | bool ret = false; | |
9006 | ||
1b00764f PB |
9007 | if (!task) { |
9008 | ret |= io_uring_try_cancel_iowq(ctx); | |
9009 | } else if (tctx && tctx->io_wq) { | |
9010 | /* | |
9011 | * Cancels requests of all rings, not only @ctx, but | |
9012 | * it's fine as the task is in exit/exec. | |
9013 | */ | |
5aa75ed5 | 9014 | cret = io_wq_cancel_cb(tctx->io_wq, io_cancel_task_cb, |
9936c7c2 PB |
9015 | &cancel, true); |
9016 | ret |= (cret != IO_WQ_CANCEL_NOTFOUND); | |
9017 | } | |
9018 | ||
9019 | /* SQPOLL thread does its own polling */ | |
3dd0c97a | 9020 | if ((!(ctx->flags & IORING_SETUP_SQPOLL) && cancel_all) || |
d052d1d6 | 9021 | (ctx->sq_data && ctx->sq_data->thread == current)) { |
9936c7c2 PB |
9022 | while (!list_empty_careful(&ctx->iopoll_list)) { |
9023 | io_iopoll_try_reap_events(ctx); | |
9024 | ret = true; | |
9025 | } | |
9026 | } | |
9027 | ||
3dd0c97a PB |
9028 | ret |= io_cancel_defer_files(ctx, task, cancel_all); |
9029 | ret |= io_poll_remove_all(ctx, task, cancel_all); | |
9030 | ret |= io_kill_timeouts(ctx, task, cancel_all); | |
e5dc480d PB |
9031 | if (task) |
9032 | ret |= io_run_task_work(); | |
9936c7c2 PB |
9033 | if (!ret) |
9034 | break; | |
9035 | cond_resched(); | |
9036 | } | |
9037 | } | |
9038 | ||
eef51daa | 9039 | static int __io_uring_add_tctx_node(struct io_ring_ctx *ctx) |
0f212204 | 9040 | { |
236434c3 | 9041 | struct io_uring_task *tctx = current->io_uring; |
13bf43f5 | 9042 | struct io_tctx_node *node; |
a528b04e | 9043 | int ret; |
236434c3 MWO |
9044 | |
9045 | if (unlikely(!tctx)) { | |
5aa75ed5 | 9046 | ret = io_uring_alloc_task_context(current, ctx); |
0f212204 JA |
9047 | if (unlikely(ret)) |
9048 | return ret; | |
236434c3 | 9049 | tctx = current->io_uring; |
0f212204 | 9050 | } |
cf27f3b1 PB |
9051 | if (!xa_load(&tctx->xa, (unsigned long)ctx)) { |
9052 | node = kmalloc(sizeof(*node), GFP_KERNEL); | |
9053 | if (!node) | |
9054 | return -ENOMEM; | |
9055 | node->ctx = ctx; | |
9056 | node->task = current; | |
13bf43f5 | 9057 | |
cf27f3b1 PB |
9058 | ret = xa_err(xa_store(&tctx->xa, (unsigned long)ctx, |
9059 | node, GFP_KERNEL)); | |
9060 | if (ret) { | |
9061 | kfree(node); | |
9062 | return ret; | |
0f212204 | 9063 | } |
cf27f3b1 PB |
9064 | |
9065 | mutex_lock(&ctx->uring_lock); | |
9066 | list_add(&node->ctx_node, &ctx->tctx_list); | |
9067 | mutex_unlock(&ctx->uring_lock); | |
0f212204 | 9068 | } |
cf27f3b1 | 9069 | tctx->last = ctx; |
0f212204 JA |
9070 | return 0; |
9071 | } | |
9072 | ||
cf27f3b1 PB |
9073 | /* |
9074 | * Note that this task has used io_uring. We use it for cancelation purposes. | |
9075 | */ | |
eef51daa | 9076 | static inline int io_uring_add_tctx_node(struct io_ring_ctx *ctx) |
cf27f3b1 PB |
9077 | { |
9078 | struct io_uring_task *tctx = current->io_uring; | |
9079 | ||
9080 | if (likely(tctx && tctx->last == ctx)) | |
9081 | return 0; | |
eef51daa | 9082 | return __io_uring_add_tctx_node(ctx); |
cf27f3b1 PB |
9083 | } |
9084 | ||
0f212204 JA |
9085 | /* |
9086 | * Remove this io_uring_file -> task mapping. | |
9087 | */ | |
eef51daa | 9088 | static void io_uring_del_tctx_node(unsigned long index) |
0f212204 JA |
9089 | { |
9090 | struct io_uring_task *tctx = current->io_uring; | |
13bf43f5 | 9091 | struct io_tctx_node *node; |
2941267b | 9092 | |
eebd2e37 PB |
9093 | if (!tctx) |
9094 | return; | |
13bf43f5 PB |
9095 | node = xa_erase(&tctx->xa, index); |
9096 | if (!node) | |
2941267b | 9097 | return; |
0f212204 | 9098 | |
13bf43f5 PB |
9099 | WARN_ON_ONCE(current != node->task); |
9100 | WARN_ON_ONCE(list_empty(&node->ctx_node)); | |
9101 | ||
9102 | mutex_lock(&node->ctx->uring_lock); | |
9103 | list_del(&node->ctx_node); | |
9104 | mutex_unlock(&node->ctx->uring_lock); | |
9105 | ||
baf186c4 | 9106 | if (tctx->last == node->ctx) |
0f212204 | 9107 | tctx->last = NULL; |
13bf43f5 | 9108 | kfree(node); |
0f212204 JA |
9109 | } |
9110 | ||
8452d4a6 | 9111 | static void io_uring_clean_tctx(struct io_uring_task *tctx) |
de7f1d9e | 9112 | { |
ba5ef6dc | 9113 | struct io_wq *wq = tctx->io_wq; |
13bf43f5 | 9114 | struct io_tctx_node *node; |
de7f1d9e PB |
9115 | unsigned long index; |
9116 | ||
13bf43f5 | 9117 | xa_for_each(&tctx->xa, index, node) |
eef51daa | 9118 | io_uring_del_tctx_node(index); |
b16ef427 ME |
9119 | if (wq) { |
9120 | /* | |
9121 | * Must be after io_uring_del_task_file() (removes nodes under | |
9122 | * uring_lock) to avoid race with io_uring_try_cancel_iowq(). | |
9123 | */ | |
9124 | tctx->io_wq = NULL; | |
ba5ef6dc | 9125 | io_wq_put_and_exit(wq); |
b16ef427 | 9126 | } |
de7f1d9e PB |
9127 | } |
9128 | ||
3f48cf18 | 9129 | static s64 tctx_inflight(struct io_uring_task *tctx, bool tracked) |
521d6a73 | 9130 | { |
3f48cf18 PB |
9131 | if (tracked) |
9132 | return atomic_read(&tctx->inflight_tracked); | |
521d6a73 PB |
9133 | return percpu_counter_sum(&tctx->inflight); |
9134 | } | |
9135 | ||
09899b19 PB |
9136 | static void io_uring_drop_tctx_refs(struct task_struct *task) |
9137 | { | |
9138 | struct io_uring_task *tctx = task->io_uring; | |
9139 | unsigned int refs = tctx->cached_refs; | |
9140 | ||
9141 | tctx->cached_refs = 0; | |
9142 | percpu_counter_sub(&tctx->inflight, refs); | |
9143 | put_task_struct_many(task, refs); | |
9144 | } | |
9145 | ||
78cc687b PB |
9146 | /* |
9147 | * Find any io_uring ctx that this task has registered or done IO on, and cancel | |
9148 | * requests. @sqd should be not-null IIF it's an SQPOLL thread cancellation. | |
9149 | */ | |
9150 | static void io_uring_cancel_generic(bool cancel_all, struct io_sq_data *sqd) | |
0e9ddb39 | 9151 | { |
521d6a73 | 9152 | struct io_uring_task *tctx = current->io_uring; |
734551df | 9153 | struct io_ring_ctx *ctx; |
0e9ddb39 PB |
9154 | s64 inflight; |
9155 | DEFINE_WAIT(wait); | |
fdaf083c | 9156 | |
78cc687b PB |
9157 | WARN_ON_ONCE(sqd && sqd->thread != current); |
9158 | ||
6d042ffb PO |
9159 | if (!current->io_uring) |
9160 | return; | |
17a91051 PB |
9161 | if (tctx->io_wq) |
9162 | io_wq_exit_start(tctx->io_wq); | |
9163 | ||
09899b19 | 9164 | io_uring_drop_tctx_refs(current); |
0e9ddb39 PB |
9165 | atomic_inc(&tctx->in_idle); |
9166 | do { | |
9167 | /* read completions before cancelations */ | |
78cc687b | 9168 | inflight = tctx_inflight(tctx, !cancel_all); |
0e9ddb39 PB |
9169 | if (!inflight) |
9170 | break; | |
fdaf083c | 9171 | |
78cc687b PB |
9172 | if (!sqd) { |
9173 | struct io_tctx_node *node; | |
9174 | unsigned long index; | |
0f212204 | 9175 | |
78cc687b PB |
9176 | xa_for_each(&tctx->xa, index, node) { |
9177 | /* sqpoll task will cancel all its requests */ | |
9178 | if (node->ctx->sq_data) | |
9179 | continue; | |
9180 | io_uring_try_cancel_requests(node->ctx, current, | |
9181 | cancel_all); | |
9182 | } | |
9183 | } else { | |
9184 | list_for_each_entry(ctx, &sqd->ctx_list, sqd_list) | |
9185 | io_uring_try_cancel_requests(ctx, current, | |
9186 | cancel_all); | |
9187 | } | |
17a91051 | 9188 | |
0f212204 | 9189 | prepare_to_wait(&tctx->wait, &wait, TASK_UNINTERRUPTIBLE); |
0f212204 | 9190 | /* |
a1bb3cd5 PB |
9191 | * If we've seen completions, retry without waiting. This |
9192 | * avoids a race where a completion comes in before we did | |
9193 | * prepare_to_wait(). | |
0f212204 | 9194 | */ |
3dd0c97a | 9195 | if (inflight == tctx_inflight(tctx, !cancel_all)) |
a1bb3cd5 | 9196 | schedule(); |
f57555ed | 9197 | finish_wait(&tctx->wait, &wait); |
d8a6df10 | 9198 | } while (1); |
fdaf083c | 9199 | atomic_dec(&tctx->in_idle); |
de7f1d9e | 9200 | |
8452d4a6 | 9201 | io_uring_clean_tctx(tctx); |
3dd0c97a | 9202 | if (cancel_all) { |
3f48cf18 PB |
9203 | /* for exec all current's requests should be gone, kill tctx */ |
9204 | __io_uring_free(current); | |
9205 | } | |
44e728b8 PB |
9206 | } |
9207 | ||
78cc687b PB |
9208 | void __io_uring_cancel(struct files_struct *files) |
9209 | { | |
9210 | io_uring_cancel_generic(!files, NULL); | |
9211 | } | |
9212 | ||
6c5c240e RP |
9213 | static void *io_uring_validate_mmap_request(struct file *file, |
9214 | loff_t pgoff, size_t sz) | |
2b188cc1 | 9215 | { |
2b188cc1 | 9216 | struct io_ring_ctx *ctx = file->private_data; |
6c5c240e | 9217 | loff_t offset = pgoff << PAGE_SHIFT; |
2b188cc1 JA |
9218 | struct page *page; |
9219 | void *ptr; | |
9220 | ||
9221 | switch (offset) { | |
9222 | case IORING_OFF_SQ_RING: | |
75b28aff HV |
9223 | case IORING_OFF_CQ_RING: |
9224 | ptr = ctx->rings; | |
2b188cc1 JA |
9225 | break; |
9226 | case IORING_OFF_SQES: | |
9227 | ptr = ctx->sq_sqes; | |
9228 | break; | |
2b188cc1 | 9229 | default: |
6c5c240e | 9230 | return ERR_PTR(-EINVAL); |
2b188cc1 JA |
9231 | } |
9232 | ||
9233 | page = virt_to_head_page(ptr); | |
a50b854e | 9234 | if (sz > page_size(page)) |
6c5c240e RP |
9235 | return ERR_PTR(-EINVAL); |
9236 | ||
9237 | return ptr; | |
9238 | } | |
9239 | ||
9240 | #ifdef CONFIG_MMU | |
9241 | ||
9242 | static int io_uring_mmap(struct file *file, struct vm_area_struct *vma) | |
9243 | { | |
9244 | size_t sz = vma->vm_end - vma->vm_start; | |
9245 | unsigned long pfn; | |
9246 | void *ptr; | |
9247 | ||
9248 | ptr = io_uring_validate_mmap_request(file, vma->vm_pgoff, sz); | |
9249 | if (IS_ERR(ptr)) | |
9250 | return PTR_ERR(ptr); | |
2b188cc1 JA |
9251 | |
9252 | pfn = virt_to_phys(ptr) >> PAGE_SHIFT; | |
9253 | return remap_pfn_range(vma, vma->vm_start, pfn, sz, vma->vm_page_prot); | |
9254 | } | |
9255 | ||
6c5c240e RP |
9256 | #else /* !CONFIG_MMU */ |
9257 | ||
9258 | static int io_uring_mmap(struct file *file, struct vm_area_struct *vma) | |
9259 | { | |
9260 | return vma->vm_flags & (VM_SHARED | VM_MAYSHARE) ? 0 : -EINVAL; | |
9261 | } | |
9262 | ||
9263 | static unsigned int io_uring_nommu_mmap_capabilities(struct file *file) | |
9264 | { | |
9265 | return NOMMU_MAP_DIRECT | NOMMU_MAP_READ | NOMMU_MAP_WRITE; | |
9266 | } | |
9267 | ||
9268 | static unsigned long io_uring_nommu_get_unmapped_area(struct file *file, | |
9269 | unsigned long addr, unsigned long len, | |
9270 | unsigned long pgoff, unsigned long flags) | |
9271 | { | |
9272 | void *ptr; | |
9273 | ||
9274 | ptr = io_uring_validate_mmap_request(file, pgoff, len); | |
9275 | if (IS_ERR(ptr)) | |
9276 | return PTR_ERR(ptr); | |
9277 | ||
9278 | return (unsigned long) ptr; | |
9279 | } | |
9280 | ||
9281 | #endif /* !CONFIG_MMU */ | |
9282 | ||
d9d05217 | 9283 | static int io_sqpoll_wait_sq(struct io_ring_ctx *ctx) |
90554200 JA |
9284 | { |
9285 | DEFINE_WAIT(wait); | |
9286 | ||
9287 | do { | |
9288 | if (!io_sqring_full(ctx)) | |
9289 | break; | |
90554200 JA |
9290 | prepare_to_wait(&ctx->sqo_sq_wait, &wait, TASK_INTERRUPTIBLE); |
9291 | ||
9292 | if (!io_sqring_full(ctx)) | |
9293 | break; | |
90554200 JA |
9294 | schedule(); |
9295 | } while (!signal_pending(current)); | |
9296 | ||
9297 | finish_wait(&ctx->sqo_sq_wait, &wait); | |
5199328a | 9298 | return 0; |
90554200 JA |
9299 | } |
9300 | ||
c73ebb68 HX |
9301 | static int io_get_ext_arg(unsigned flags, const void __user *argp, size_t *argsz, |
9302 | struct __kernel_timespec __user **ts, | |
9303 | const sigset_t __user **sig) | |
9304 | { | |
9305 | struct io_uring_getevents_arg arg; | |
9306 | ||
9307 | /* | |
9308 | * If EXT_ARG isn't set, then we have no timespec and the argp pointer | |
9309 | * is just a pointer to the sigset_t. | |
9310 | */ | |
9311 | if (!(flags & IORING_ENTER_EXT_ARG)) { | |
9312 | *sig = (const sigset_t __user *) argp; | |
9313 | *ts = NULL; | |
9314 | return 0; | |
9315 | } | |
9316 | ||
9317 | /* | |
9318 | * EXT_ARG is set - ensure we agree on the size of it and copy in our | |
9319 | * timespec and sigset_t pointers if good. | |
9320 | */ | |
9321 | if (*argsz != sizeof(arg)) | |
9322 | return -EINVAL; | |
9323 | if (copy_from_user(&arg, argp, sizeof(arg))) | |
9324 | return -EFAULT; | |
9325 | *sig = u64_to_user_ptr(arg.sigmask); | |
9326 | *argsz = arg.sigmask_sz; | |
9327 | *ts = u64_to_user_ptr(arg.ts); | |
9328 | return 0; | |
9329 | } | |
9330 | ||
2b188cc1 | 9331 | SYSCALL_DEFINE6(io_uring_enter, unsigned int, fd, u32, to_submit, |
c73ebb68 HX |
9332 | u32, min_complete, u32, flags, const void __user *, argp, |
9333 | size_t, argsz) | |
2b188cc1 JA |
9334 | { |
9335 | struct io_ring_ctx *ctx; | |
2b188cc1 JA |
9336 | int submitted = 0; |
9337 | struct fd f; | |
33f993da | 9338 | long ret; |
2b188cc1 | 9339 | |
4c6e277c | 9340 | io_run_task_work(); |
b41e9852 | 9341 | |
33f993da PB |
9342 | if (unlikely(flags & ~(IORING_ENTER_GETEVENTS | IORING_ENTER_SQ_WAKEUP | |
9343 | IORING_ENTER_SQ_WAIT | IORING_ENTER_EXT_ARG))) | |
2b188cc1 JA |
9344 | return -EINVAL; |
9345 | ||
9346 | f = fdget(fd); | |
33f993da | 9347 | if (unlikely(!f.file)) |
2b188cc1 JA |
9348 | return -EBADF; |
9349 | ||
9350 | ret = -EOPNOTSUPP; | |
33f993da | 9351 | if (unlikely(f.file->f_op != &io_uring_fops)) |
2b188cc1 JA |
9352 | goto out_fput; |
9353 | ||
9354 | ret = -ENXIO; | |
9355 | ctx = f.file->private_data; | |
33f993da | 9356 | if (unlikely(!percpu_ref_tryget(&ctx->refs))) |
2b188cc1 JA |
9357 | goto out_fput; |
9358 | ||
7e84e1c7 | 9359 | ret = -EBADFD; |
33f993da | 9360 | if (unlikely(ctx->flags & IORING_SETUP_R_DISABLED)) |
7e84e1c7 SG |
9361 | goto out; |
9362 | ||
6c271ce2 JA |
9363 | /* |
9364 | * For SQ polling, the thread will do all submissions and completions. | |
9365 | * Just return the requested submit count, and wake the thread if | |
9366 | * we were asked to. | |
9367 | */ | |
b2a9eada | 9368 | ret = 0; |
6c271ce2 | 9369 | if (ctx->flags & IORING_SETUP_SQPOLL) { |
6c2450ae | 9370 | io_cqring_overflow_flush(ctx, false); |
89448c47 | 9371 | |
21f96522 JA |
9372 | if (unlikely(ctx->sq_data->thread == NULL)) { |
9373 | ret = -EOWNERDEAD; | |
04147488 | 9374 | goto out; |
21f96522 | 9375 | } |
6c271ce2 | 9376 | if (flags & IORING_ENTER_SQ_WAKEUP) |
534ca6d6 | 9377 | wake_up(&ctx->sq_data->wait); |
d9d05217 PB |
9378 | if (flags & IORING_ENTER_SQ_WAIT) { |
9379 | ret = io_sqpoll_wait_sq(ctx); | |
9380 | if (ret) | |
9381 | goto out; | |
9382 | } | |
6c271ce2 | 9383 | submitted = to_submit; |
b2a9eada | 9384 | } else if (to_submit) { |
eef51daa | 9385 | ret = io_uring_add_tctx_node(ctx); |
0f212204 JA |
9386 | if (unlikely(ret)) |
9387 | goto out; | |
2b188cc1 | 9388 | mutex_lock(&ctx->uring_lock); |
0f212204 | 9389 | submitted = io_submit_sqes(ctx, to_submit); |
2b188cc1 | 9390 | mutex_unlock(&ctx->uring_lock); |
7c504e65 PB |
9391 | |
9392 | if (submitted != to_submit) | |
9393 | goto out; | |
2b188cc1 JA |
9394 | } |
9395 | if (flags & IORING_ENTER_GETEVENTS) { | |
c73ebb68 HX |
9396 | const sigset_t __user *sig; |
9397 | struct __kernel_timespec __user *ts; | |
9398 | ||
9399 | ret = io_get_ext_arg(flags, argp, &argsz, &ts, &sig); | |
9400 | if (unlikely(ret)) | |
9401 | goto out; | |
9402 | ||
2b188cc1 JA |
9403 | min_complete = min(min_complete, ctx->cq_entries); |
9404 | ||
32b2244a XW |
9405 | /* |
9406 | * When SETUP_IOPOLL and SETUP_SQPOLL are both enabled, user | |
9407 | * space applications don't need to do io completion events | |
9408 | * polling again, they can rely on io_sq_thread to do polling | |
9409 | * work, which can reduce cpu usage and uring_lock contention. | |
9410 | */ | |
9411 | if (ctx->flags & IORING_SETUP_IOPOLL && | |
9412 | !(ctx->flags & IORING_SETUP_SQPOLL)) { | |
7668b92a | 9413 | ret = io_iopoll_check(ctx, min_complete); |
def596e9 | 9414 | } else { |
c73ebb68 | 9415 | ret = io_cqring_wait(ctx, min_complete, sig, argsz, ts); |
def596e9 | 9416 | } |
2b188cc1 JA |
9417 | } |
9418 | ||
7c504e65 | 9419 | out: |
6805b32e | 9420 | percpu_ref_put(&ctx->refs); |
2b188cc1 JA |
9421 | out_fput: |
9422 | fdput(f); | |
9423 | return submitted ? submitted : ret; | |
9424 | } | |
9425 | ||
bebdb65e | 9426 | #ifdef CONFIG_PROC_FS |
61cf9370 MWO |
9427 | static int io_uring_show_cred(struct seq_file *m, unsigned int id, |
9428 | const struct cred *cred) | |
87ce955b | 9429 | { |
87ce955b JA |
9430 | struct user_namespace *uns = seq_user_ns(m); |
9431 | struct group_info *gi; | |
9432 | kernel_cap_t cap; | |
9433 | unsigned __capi; | |
9434 | int g; | |
9435 | ||
9436 | seq_printf(m, "%5d\n", id); | |
9437 | seq_put_decimal_ull(m, "\tUid:\t", from_kuid_munged(uns, cred->uid)); | |
9438 | seq_put_decimal_ull(m, "\t\t", from_kuid_munged(uns, cred->euid)); | |
9439 | seq_put_decimal_ull(m, "\t\t", from_kuid_munged(uns, cred->suid)); | |
9440 | seq_put_decimal_ull(m, "\t\t", from_kuid_munged(uns, cred->fsuid)); | |
9441 | seq_put_decimal_ull(m, "\n\tGid:\t", from_kgid_munged(uns, cred->gid)); | |
9442 | seq_put_decimal_ull(m, "\t\t", from_kgid_munged(uns, cred->egid)); | |
9443 | seq_put_decimal_ull(m, "\t\t", from_kgid_munged(uns, cred->sgid)); | |
9444 | seq_put_decimal_ull(m, "\t\t", from_kgid_munged(uns, cred->fsgid)); | |
9445 | seq_puts(m, "\n\tGroups:\t"); | |
9446 | gi = cred->group_info; | |
9447 | for (g = 0; g < gi->ngroups; g++) { | |
9448 | seq_put_decimal_ull(m, g ? " " : "", | |
9449 | from_kgid_munged(uns, gi->gid[g])); | |
9450 | } | |
9451 | seq_puts(m, "\n\tCapEff:\t"); | |
9452 | cap = cred->cap_effective; | |
9453 | CAP_FOR_EACH_U32(__capi) | |
9454 | seq_put_hex_ll(m, NULL, cap.cap[CAP_LAST_U32 - __capi], 8); | |
9455 | seq_putc(m, '\n'); | |
9456 | return 0; | |
9457 | } | |
9458 | ||
9459 | static void __io_uring_show_fdinfo(struct io_ring_ctx *ctx, struct seq_file *m) | |
9460 | { | |
dbbe9c64 | 9461 | struct io_sq_data *sq = NULL; |
fad8e0de | 9462 | bool has_lock; |
87ce955b JA |
9463 | int i; |
9464 | ||
fad8e0de JA |
9465 | /* |
9466 | * Avoid ABBA deadlock between the seq lock and the io_uring mutex, | |
9467 | * since fdinfo case grabs it in the opposite direction of normal use | |
9468 | * cases. If we fail to get the lock, we just don't iterate any | |
9469 | * structures that could be going away outside the io_uring mutex. | |
9470 | */ | |
9471 | has_lock = mutex_trylock(&ctx->uring_lock); | |
9472 | ||
5f3f26f9 | 9473 | if (has_lock && (ctx->flags & IORING_SETUP_SQPOLL)) { |
dbbe9c64 | 9474 | sq = ctx->sq_data; |
5f3f26f9 JA |
9475 | if (!sq->thread) |
9476 | sq = NULL; | |
9477 | } | |
dbbe9c64 JQ |
9478 | |
9479 | seq_printf(m, "SqThread:\t%d\n", sq ? task_pid_nr(sq->thread) : -1); | |
9480 | seq_printf(m, "SqThreadCpu:\t%d\n", sq ? task_cpu(sq->thread) : -1); | |
87ce955b | 9481 | seq_printf(m, "UserFiles:\t%u\n", ctx->nr_user_files); |
fad8e0de | 9482 | for (i = 0; has_lock && i < ctx->nr_user_files; i++) { |
7b29f92d | 9483 | struct file *f = io_file_from_index(ctx, i); |
87ce955b | 9484 | |
87ce955b JA |
9485 | if (f) |
9486 | seq_printf(m, "%5u: %s\n", i, file_dentry(f)->d_iname); | |
9487 | else | |
9488 | seq_printf(m, "%5u: <none>\n", i); | |
9489 | } | |
9490 | seq_printf(m, "UserBufs:\t%u\n", ctx->nr_user_bufs); | |
fad8e0de | 9491 | for (i = 0; has_lock && i < ctx->nr_user_bufs; i++) { |
41edf1a5 | 9492 | struct io_mapped_ubuf *buf = ctx->user_bufs[i]; |
4751f53d | 9493 | unsigned int len = buf->ubuf_end - buf->ubuf; |
87ce955b | 9494 | |
4751f53d | 9495 | seq_printf(m, "%5u: 0x%llx/%u\n", i, buf->ubuf, len); |
87ce955b | 9496 | } |
61cf9370 MWO |
9497 | if (has_lock && !xa_empty(&ctx->personalities)) { |
9498 | unsigned long index; | |
9499 | const struct cred *cred; | |
9500 | ||
87ce955b | 9501 | seq_printf(m, "Personalities:\n"); |
61cf9370 MWO |
9502 | xa_for_each(&ctx->personalities, index, cred) |
9503 | io_uring_show_cred(m, index, cred); | |
87ce955b | 9504 | } |
d7718a9d JA |
9505 | seq_printf(m, "PollList:\n"); |
9506 | spin_lock_irq(&ctx->completion_lock); | |
9507 | for (i = 0; i < (1U << ctx->cancel_hash_bits); i++) { | |
9508 | struct hlist_head *list = &ctx->cancel_hash[i]; | |
9509 | struct io_kiocb *req; | |
9510 | ||
9511 | hlist_for_each_entry(req, list, hash_node) | |
9512 | seq_printf(m, " op=%d, task_works=%d\n", req->opcode, | |
9513 | req->task->task_works != NULL); | |
9514 | } | |
9515 | spin_unlock_irq(&ctx->completion_lock); | |
fad8e0de JA |
9516 | if (has_lock) |
9517 | mutex_unlock(&ctx->uring_lock); | |
87ce955b JA |
9518 | } |
9519 | ||
9520 | static void io_uring_show_fdinfo(struct seq_file *m, struct file *f) | |
9521 | { | |
9522 | struct io_ring_ctx *ctx = f->private_data; | |
9523 | ||
9524 | if (percpu_ref_tryget(&ctx->refs)) { | |
9525 | __io_uring_show_fdinfo(ctx, m); | |
9526 | percpu_ref_put(&ctx->refs); | |
9527 | } | |
9528 | } | |
bebdb65e | 9529 | #endif |
87ce955b | 9530 | |
2b188cc1 JA |
9531 | static const struct file_operations io_uring_fops = { |
9532 | .release = io_uring_release, | |
9533 | .mmap = io_uring_mmap, | |
6c5c240e RP |
9534 | #ifndef CONFIG_MMU |
9535 | .get_unmapped_area = io_uring_nommu_get_unmapped_area, | |
9536 | .mmap_capabilities = io_uring_nommu_mmap_capabilities, | |
9537 | #endif | |
2b188cc1 JA |
9538 | .poll = io_uring_poll, |
9539 | .fasync = io_uring_fasync, | |
bebdb65e | 9540 | #ifdef CONFIG_PROC_FS |
87ce955b | 9541 | .show_fdinfo = io_uring_show_fdinfo, |
bebdb65e | 9542 | #endif |
2b188cc1 JA |
9543 | }; |
9544 | ||
9545 | static int io_allocate_scq_urings(struct io_ring_ctx *ctx, | |
9546 | struct io_uring_params *p) | |
9547 | { | |
75b28aff HV |
9548 | struct io_rings *rings; |
9549 | size_t size, sq_array_offset; | |
2b188cc1 | 9550 | |
bd740481 JA |
9551 | /* make sure these are sane, as we already accounted them */ |
9552 | ctx->sq_entries = p->sq_entries; | |
9553 | ctx->cq_entries = p->cq_entries; | |
9554 | ||
75b28aff HV |
9555 | size = rings_size(p->sq_entries, p->cq_entries, &sq_array_offset); |
9556 | if (size == SIZE_MAX) | |
9557 | return -EOVERFLOW; | |
9558 | ||
9559 | rings = io_mem_alloc(size); | |
9560 | if (!rings) | |
2b188cc1 JA |
9561 | return -ENOMEM; |
9562 | ||
75b28aff HV |
9563 | ctx->rings = rings; |
9564 | ctx->sq_array = (u32 *)((char *)rings + sq_array_offset); | |
9565 | rings->sq_ring_mask = p->sq_entries - 1; | |
9566 | rings->cq_ring_mask = p->cq_entries - 1; | |
9567 | rings->sq_ring_entries = p->sq_entries; | |
9568 | rings->cq_ring_entries = p->cq_entries; | |
2b188cc1 JA |
9569 | |
9570 | size = array_size(sizeof(struct io_uring_sqe), p->sq_entries); | |
eb065d30 JA |
9571 | if (size == SIZE_MAX) { |
9572 | io_mem_free(ctx->rings); | |
9573 | ctx->rings = NULL; | |
2b188cc1 | 9574 | return -EOVERFLOW; |
eb065d30 | 9575 | } |
2b188cc1 JA |
9576 | |
9577 | ctx->sq_sqes = io_mem_alloc(size); | |
eb065d30 JA |
9578 | if (!ctx->sq_sqes) { |
9579 | io_mem_free(ctx->rings); | |
9580 | ctx->rings = NULL; | |
2b188cc1 | 9581 | return -ENOMEM; |
eb065d30 | 9582 | } |
2b188cc1 | 9583 | |
2b188cc1 JA |
9584 | return 0; |
9585 | } | |
9586 | ||
9faadcc8 PB |
9587 | static int io_uring_install_fd(struct io_ring_ctx *ctx, struct file *file) |
9588 | { | |
9589 | int ret, fd; | |
9590 | ||
9591 | fd = get_unused_fd_flags(O_RDWR | O_CLOEXEC); | |
9592 | if (fd < 0) | |
9593 | return fd; | |
9594 | ||
eef51daa | 9595 | ret = io_uring_add_tctx_node(ctx); |
9faadcc8 PB |
9596 | if (ret) { |
9597 | put_unused_fd(fd); | |
9598 | return ret; | |
9599 | } | |
9600 | fd_install(fd, file); | |
9601 | return fd; | |
9602 | } | |
9603 | ||
2b188cc1 JA |
9604 | /* |
9605 | * Allocate an anonymous fd, this is what constitutes the application | |
9606 | * visible backing of an io_uring instance. The application mmaps this | |
9607 | * fd to gain access to the SQ/CQ ring details. If UNIX sockets are enabled, | |
9608 | * we have to tie this fd to a socket for file garbage collection purposes. | |
9609 | */ | |
9faadcc8 | 9610 | static struct file *io_uring_get_file(struct io_ring_ctx *ctx) |
2b188cc1 JA |
9611 | { |
9612 | struct file *file; | |
9faadcc8 | 9613 | #if defined(CONFIG_UNIX) |
2b188cc1 JA |
9614 | int ret; |
9615 | ||
2b188cc1 JA |
9616 | ret = sock_create_kern(&init_net, PF_UNIX, SOCK_RAW, IPPROTO_IP, |
9617 | &ctx->ring_sock); | |
9618 | if (ret) | |
9faadcc8 | 9619 | return ERR_PTR(ret); |
2b188cc1 JA |
9620 | #endif |
9621 | ||
2b188cc1 JA |
9622 | file = anon_inode_getfile("[io_uring]", &io_uring_fops, ctx, |
9623 | O_RDWR | O_CLOEXEC); | |
2b188cc1 | 9624 | #if defined(CONFIG_UNIX) |
9faadcc8 PB |
9625 | if (IS_ERR(file)) { |
9626 | sock_release(ctx->ring_sock); | |
9627 | ctx->ring_sock = NULL; | |
9628 | } else { | |
9629 | ctx->ring_sock->file = file; | |
0f212204 | 9630 | } |
2b188cc1 | 9631 | #endif |
9faadcc8 | 9632 | return file; |
2b188cc1 JA |
9633 | } |
9634 | ||
7f13657d XW |
9635 | static int io_uring_create(unsigned entries, struct io_uring_params *p, |
9636 | struct io_uring_params __user *params) | |
2b188cc1 | 9637 | { |
2b188cc1 | 9638 | struct io_ring_ctx *ctx; |
9faadcc8 | 9639 | struct file *file; |
2b188cc1 JA |
9640 | int ret; |
9641 | ||
8110c1a6 | 9642 | if (!entries) |
2b188cc1 | 9643 | return -EINVAL; |
8110c1a6 JA |
9644 | if (entries > IORING_MAX_ENTRIES) { |
9645 | if (!(p->flags & IORING_SETUP_CLAMP)) | |
9646 | return -EINVAL; | |
9647 | entries = IORING_MAX_ENTRIES; | |
9648 | } | |
2b188cc1 JA |
9649 | |
9650 | /* | |
9651 | * Use twice as many entries for the CQ ring. It's possible for the | |
9652 | * application to drive a higher depth than the size of the SQ ring, | |
9653 | * since the sqes are only used at submission time. This allows for | |
33a107f0 JA |
9654 | * some flexibility in overcommitting a bit. If the application has |
9655 | * set IORING_SETUP_CQSIZE, it will have passed in the desired number | |
9656 | * of CQ ring entries manually. | |
2b188cc1 JA |
9657 | */ |
9658 | p->sq_entries = roundup_pow_of_two(entries); | |
33a107f0 JA |
9659 | if (p->flags & IORING_SETUP_CQSIZE) { |
9660 | /* | |
9661 | * If IORING_SETUP_CQSIZE is set, we do the same roundup | |
9662 | * to a power-of-two, if it isn't already. We do NOT impose | |
9663 | * any cq vs sq ring sizing. | |
9664 | */ | |
eb2667b3 | 9665 | if (!p->cq_entries) |
33a107f0 | 9666 | return -EINVAL; |
8110c1a6 JA |
9667 | if (p->cq_entries > IORING_MAX_CQ_ENTRIES) { |
9668 | if (!(p->flags & IORING_SETUP_CLAMP)) | |
9669 | return -EINVAL; | |
9670 | p->cq_entries = IORING_MAX_CQ_ENTRIES; | |
9671 | } | |
eb2667b3 JQ |
9672 | p->cq_entries = roundup_pow_of_two(p->cq_entries); |
9673 | if (p->cq_entries < p->sq_entries) | |
9674 | return -EINVAL; | |
33a107f0 JA |
9675 | } else { |
9676 | p->cq_entries = 2 * p->sq_entries; | |
9677 | } | |
2b188cc1 | 9678 | |
2b188cc1 | 9679 | ctx = io_ring_ctx_alloc(p); |
62e398be | 9680 | if (!ctx) |
2b188cc1 | 9681 | return -ENOMEM; |
2b188cc1 | 9682 | ctx->compat = in_compat_syscall(); |
62e398be JA |
9683 | if (!capable(CAP_IPC_LOCK)) |
9684 | ctx->user = get_uid(current_user()); | |
2aede0e4 JA |
9685 | |
9686 | /* | |
9687 | * This is just grabbed for accounting purposes. When a process exits, | |
9688 | * the mm is exited and dropped before the files, hence we need to hang | |
9689 | * on to this mm purely for the purposes of being able to unaccount | |
9690 | * memory (locked/pinned vm). It's not used for anything else. | |
9691 | */ | |
6b7898eb | 9692 | mmgrab(current->mm); |
2aede0e4 | 9693 | ctx->mm_account = current->mm; |
6b7898eb | 9694 | |
2b188cc1 JA |
9695 | ret = io_allocate_scq_urings(ctx, p); |
9696 | if (ret) | |
9697 | goto err; | |
9698 | ||
7e84e1c7 | 9699 | ret = io_sq_offload_create(ctx, p); |
2b188cc1 JA |
9700 | if (ret) |
9701 | goto err; | |
eae071c9 | 9702 | /* always set a rsrc node */ |
47b228ce PB |
9703 | ret = io_rsrc_node_switch_start(ctx); |
9704 | if (ret) | |
9705 | goto err; | |
eae071c9 | 9706 | io_rsrc_node_switch(ctx, NULL); |
2b188cc1 | 9707 | |
2b188cc1 | 9708 | memset(&p->sq_off, 0, sizeof(p->sq_off)); |
75b28aff HV |
9709 | p->sq_off.head = offsetof(struct io_rings, sq.head); |
9710 | p->sq_off.tail = offsetof(struct io_rings, sq.tail); | |
9711 | p->sq_off.ring_mask = offsetof(struct io_rings, sq_ring_mask); | |
9712 | p->sq_off.ring_entries = offsetof(struct io_rings, sq_ring_entries); | |
9713 | p->sq_off.flags = offsetof(struct io_rings, sq_flags); | |
9714 | p->sq_off.dropped = offsetof(struct io_rings, sq_dropped); | |
9715 | p->sq_off.array = (char *)ctx->sq_array - (char *)ctx->rings; | |
2b188cc1 JA |
9716 | |
9717 | memset(&p->cq_off, 0, sizeof(p->cq_off)); | |
75b28aff HV |
9718 | p->cq_off.head = offsetof(struct io_rings, cq.head); |
9719 | p->cq_off.tail = offsetof(struct io_rings, cq.tail); | |
9720 | p->cq_off.ring_mask = offsetof(struct io_rings, cq_ring_mask); | |
9721 | p->cq_off.ring_entries = offsetof(struct io_rings, cq_ring_entries); | |
9722 | p->cq_off.overflow = offsetof(struct io_rings, cq_overflow); | |
9723 | p->cq_off.cqes = offsetof(struct io_rings, cqes); | |
0d9b5b3a | 9724 | p->cq_off.flags = offsetof(struct io_rings, cq_flags); |
ac90f249 | 9725 | |
7f13657d XW |
9726 | p->features = IORING_FEAT_SINGLE_MMAP | IORING_FEAT_NODROP | |
9727 | IORING_FEAT_SUBMIT_STABLE | IORING_FEAT_RW_CUR_POS | | |
5769a351 | 9728 | IORING_FEAT_CUR_PERSONALITY | IORING_FEAT_FAST_POLL | |
c73ebb68 | 9729 | IORING_FEAT_POLL_32BITS | IORING_FEAT_SQPOLL_NONFIXED | |
9690557e PB |
9730 | IORING_FEAT_EXT_ARG | IORING_FEAT_NATIVE_WORKERS | |
9731 | IORING_FEAT_RSRC_TAGS; | |
7f13657d XW |
9732 | |
9733 | if (copy_to_user(params, p, sizeof(*p))) { | |
9734 | ret = -EFAULT; | |
9735 | goto err; | |
9736 | } | |
d1719f70 | 9737 | |
9faadcc8 PB |
9738 | file = io_uring_get_file(ctx); |
9739 | if (IS_ERR(file)) { | |
9740 | ret = PTR_ERR(file); | |
9741 | goto err; | |
9742 | } | |
9743 | ||
044c1ab3 JA |
9744 | /* |
9745 | * Install ring fd as the very last thing, so we don't risk someone | |
9746 | * having closed it before we finish setup | |
9747 | */ | |
9faadcc8 PB |
9748 | ret = io_uring_install_fd(ctx, file); |
9749 | if (ret < 0) { | |
9750 | /* fput will clean it up */ | |
9751 | fput(file); | |
9752 | return ret; | |
9753 | } | |
044c1ab3 | 9754 | |
c826bd7a | 9755 | trace_io_uring_create(ret, ctx, p->sq_entries, p->cq_entries, p->flags); |
2b188cc1 JA |
9756 | return ret; |
9757 | err: | |
9758 | io_ring_ctx_wait_and_kill(ctx); | |
9759 | return ret; | |
9760 | } | |
9761 | ||
9762 | /* | |
9763 | * Sets up an aio uring context, and returns the fd. Applications asks for a | |
9764 | * ring size, we return the actual sq/cq ring sizes (among other things) in the | |
9765 | * params structure passed in. | |
9766 | */ | |
9767 | static long io_uring_setup(u32 entries, struct io_uring_params __user *params) | |
9768 | { | |
9769 | struct io_uring_params p; | |
2b188cc1 JA |
9770 | int i; |
9771 | ||
9772 | if (copy_from_user(&p, params, sizeof(p))) | |
9773 | return -EFAULT; | |
9774 | for (i = 0; i < ARRAY_SIZE(p.resv); i++) { | |
9775 | if (p.resv[i]) | |
9776 | return -EINVAL; | |
9777 | } | |
9778 | ||
6c271ce2 | 9779 | if (p.flags & ~(IORING_SETUP_IOPOLL | IORING_SETUP_SQPOLL | |
8110c1a6 | 9780 | IORING_SETUP_SQ_AFF | IORING_SETUP_CQSIZE | |
7e84e1c7 SG |
9781 | IORING_SETUP_CLAMP | IORING_SETUP_ATTACH_WQ | |
9782 | IORING_SETUP_R_DISABLED)) | |
2b188cc1 JA |
9783 | return -EINVAL; |
9784 | ||
7f13657d | 9785 | return io_uring_create(entries, &p, params); |
2b188cc1 JA |
9786 | } |
9787 | ||
9788 | SYSCALL_DEFINE2(io_uring_setup, u32, entries, | |
9789 | struct io_uring_params __user *, params) | |
9790 | { | |
9791 | return io_uring_setup(entries, params); | |
9792 | } | |
9793 | ||
66f4af93 JA |
9794 | static int io_probe(struct io_ring_ctx *ctx, void __user *arg, unsigned nr_args) |
9795 | { | |
9796 | struct io_uring_probe *p; | |
9797 | size_t size; | |
9798 | int i, ret; | |
9799 | ||
9800 | size = struct_size(p, ops, nr_args); | |
9801 | if (size == SIZE_MAX) | |
9802 | return -EOVERFLOW; | |
9803 | p = kzalloc(size, GFP_KERNEL); | |
9804 | if (!p) | |
9805 | return -ENOMEM; | |
9806 | ||
9807 | ret = -EFAULT; | |
9808 | if (copy_from_user(p, arg, size)) | |
9809 | goto out; | |
9810 | ret = -EINVAL; | |
9811 | if (memchr_inv(p, 0, size)) | |
9812 | goto out; | |
9813 | ||
9814 | p->last_op = IORING_OP_LAST - 1; | |
9815 | if (nr_args > IORING_OP_LAST) | |
9816 | nr_args = IORING_OP_LAST; | |
9817 | ||
9818 | for (i = 0; i < nr_args; i++) { | |
9819 | p->ops[i].op = i; | |
9820 | if (!io_op_defs[i].not_supported) | |
9821 | p->ops[i].flags = IO_URING_OP_SUPPORTED; | |
9822 | } | |
9823 | p->ops_len = i; | |
9824 | ||
9825 | ret = 0; | |
9826 | if (copy_to_user(arg, p, size)) | |
9827 | ret = -EFAULT; | |
9828 | out: | |
9829 | kfree(p); | |
9830 | return ret; | |
9831 | } | |
9832 | ||
071698e1 JA |
9833 | static int io_register_personality(struct io_ring_ctx *ctx) |
9834 | { | |
4379bf8b | 9835 | const struct cred *creds; |
61cf9370 | 9836 | u32 id; |
1e6fa521 | 9837 | int ret; |
071698e1 | 9838 | |
4379bf8b | 9839 | creds = get_current_cred(); |
1e6fa521 | 9840 | |
61cf9370 MWO |
9841 | ret = xa_alloc_cyclic(&ctx->personalities, &id, (void *)creds, |
9842 | XA_LIMIT(0, USHRT_MAX), &ctx->pers_next, GFP_KERNEL); | |
a30f895a JA |
9843 | if (ret < 0) { |
9844 | put_cred(creds); | |
9845 | return ret; | |
9846 | } | |
9847 | return id; | |
071698e1 JA |
9848 | } |
9849 | ||
21b55dbc SG |
9850 | static int io_register_restrictions(struct io_ring_ctx *ctx, void __user *arg, |
9851 | unsigned int nr_args) | |
9852 | { | |
9853 | struct io_uring_restriction *res; | |
9854 | size_t size; | |
9855 | int i, ret; | |
9856 | ||
7e84e1c7 SG |
9857 | /* Restrictions allowed only if rings started disabled */ |
9858 | if (!(ctx->flags & IORING_SETUP_R_DISABLED)) | |
9859 | return -EBADFD; | |
9860 | ||
21b55dbc | 9861 | /* We allow only a single restrictions registration */ |
7e84e1c7 | 9862 | if (ctx->restrictions.registered) |
21b55dbc SG |
9863 | return -EBUSY; |
9864 | ||
9865 | if (!arg || nr_args > IORING_MAX_RESTRICTIONS) | |
9866 | return -EINVAL; | |
9867 | ||
9868 | size = array_size(nr_args, sizeof(*res)); | |
9869 | if (size == SIZE_MAX) | |
9870 | return -EOVERFLOW; | |
9871 | ||
9872 | res = memdup_user(arg, size); | |
9873 | if (IS_ERR(res)) | |
9874 | return PTR_ERR(res); | |
9875 | ||
9876 | ret = 0; | |
9877 | ||
9878 | for (i = 0; i < nr_args; i++) { | |
9879 | switch (res[i].opcode) { | |
9880 | case IORING_RESTRICTION_REGISTER_OP: | |
9881 | if (res[i].register_op >= IORING_REGISTER_LAST) { | |
9882 | ret = -EINVAL; | |
9883 | goto out; | |
9884 | } | |
9885 | ||
9886 | __set_bit(res[i].register_op, | |
9887 | ctx->restrictions.register_op); | |
9888 | break; | |
9889 | case IORING_RESTRICTION_SQE_OP: | |
9890 | if (res[i].sqe_op >= IORING_OP_LAST) { | |
9891 | ret = -EINVAL; | |
9892 | goto out; | |
9893 | } | |
9894 | ||
9895 | __set_bit(res[i].sqe_op, ctx->restrictions.sqe_op); | |
9896 | break; | |
9897 | case IORING_RESTRICTION_SQE_FLAGS_ALLOWED: | |
9898 | ctx->restrictions.sqe_flags_allowed = res[i].sqe_flags; | |
9899 | break; | |
9900 | case IORING_RESTRICTION_SQE_FLAGS_REQUIRED: | |
9901 | ctx->restrictions.sqe_flags_required = res[i].sqe_flags; | |
9902 | break; | |
9903 | default: | |
9904 | ret = -EINVAL; | |
9905 | goto out; | |
9906 | } | |
9907 | } | |
9908 | ||
9909 | out: | |
9910 | /* Reset all restrictions if an error happened */ | |
9911 | if (ret != 0) | |
9912 | memset(&ctx->restrictions, 0, sizeof(ctx->restrictions)); | |
9913 | else | |
7e84e1c7 | 9914 | ctx->restrictions.registered = true; |
21b55dbc SG |
9915 | |
9916 | kfree(res); | |
9917 | return ret; | |
9918 | } | |
9919 | ||
7e84e1c7 SG |
9920 | static int io_register_enable_rings(struct io_ring_ctx *ctx) |
9921 | { | |
9922 | if (!(ctx->flags & IORING_SETUP_R_DISABLED)) | |
9923 | return -EBADFD; | |
9924 | ||
9925 | if (ctx->restrictions.registered) | |
9926 | ctx->restricted = 1; | |
9927 | ||
0298ef96 PB |
9928 | ctx->flags &= ~IORING_SETUP_R_DISABLED; |
9929 | if (ctx->sq_data && wq_has_sleeper(&ctx->sq_data->wait)) | |
9930 | wake_up(&ctx->sq_data->wait); | |
7e84e1c7 SG |
9931 | return 0; |
9932 | } | |
9933 | ||
fdecb662 | 9934 | static int __io_register_rsrc_update(struct io_ring_ctx *ctx, unsigned type, |
c3bdad02 | 9935 | struct io_uring_rsrc_update2 *up, |
98f0b3b4 PB |
9936 | unsigned nr_args) |
9937 | { | |
9938 | __u32 tmp; | |
9939 | int err; | |
9940 | ||
c3bdad02 PB |
9941 | if (up->resv) |
9942 | return -EINVAL; | |
98f0b3b4 PB |
9943 | if (check_add_overflow(up->offset, nr_args, &tmp)) |
9944 | return -EOVERFLOW; | |
9945 | err = io_rsrc_node_switch_start(ctx); | |
9946 | if (err) | |
9947 | return err; | |
9948 | ||
fdecb662 PB |
9949 | switch (type) { |
9950 | case IORING_RSRC_FILE: | |
98f0b3b4 | 9951 | return __io_sqe_files_update(ctx, up, nr_args); |
634d00df PB |
9952 | case IORING_RSRC_BUFFER: |
9953 | return __io_sqe_buffers_update(ctx, up, nr_args); | |
98f0b3b4 PB |
9954 | } |
9955 | return -EINVAL; | |
9956 | } | |
9957 | ||
c3bdad02 PB |
9958 | static int io_register_files_update(struct io_ring_ctx *ctx, void __user *arg, |
9959 | unsigned nr_args) | |
98f0b3b4 | 9960 | { |
c3bdad02 | 9961 | struct io_uring_rsrc_update2 up; |
98f0b3b4 PB |
9962 | |
9963 | if (!nr_args) | |
9964 | return -EINVAL; | |
c3bdad02 PB |
9965 | memset(&up, 0, sizeof(up)); |
9966 | if (copy_from_user(&up, arg, sizeof(struct io_uring_rsrc_update))) | |
9967 | return -EFAULT; | |
9968 | return __io_register_rsrc_update(ctx, IORING_RSRC_FILE, &up, nr_args); | |
9969 | } | |
9970 | ||
9971 | static int io_register_rsrc_update(struct io_ring_ctx *ctx, void __user *arg, | |
992da01a | 9972 | unsigned size, unsigned type) |
c3bdad02 PB |
9973 | { |
9974 | struct io_uring_rsrc_update2 up; | |
9975 | ||
9976 | if (size != sizeof(up)) | |
9977 | return -EINVAL; | |
98f0b3b4 PB |
9978 | if (copy_from_user(&up, arg, sizeof(up))) |
9979 | return -EFAULT; | |
992da01a | 9980 | if (!up.nr || up.resv) |
98f0b3b4 | 9981 | return -EINVAL; |
992da01a | 9982 | return __io_register_rsrc_update(ctx, type, &up, up.nr); |
98f0b3b4 PB |
9983 | } |
9984 | ||
792e3582 | 9985 | static int io_register_rsrc(struct io_ring_ctx *ctx, void __user *arg, |
992da01a | 9986 | unsigned int size, unsigned int type) |
792e3582 PB |
9987 | { |
9988 | struct io_uring_rsrc_register rr; | |
9989 | ||
9990 | /* keep it extendible */ | |
9991 | if (size != sizeof(rr)) | |
9992 | return -EINVAL; | |
9993 | ||
9994 | memset(&rr, 0, sizeof(rr)); | |
9995 | if (copy_from_user(&rr, arg, size)) | |
9996 | return -EFAULT; | |
992da01a | 9997 | if (!rr.nr || rr.resv || rr.resv2) |
792e3582 PB |
9998 | return -EINVAL; |
9999 | ||
992da01a | 10000 | switch (type) { |
792e3582 PB |
10001 | case IORING_RSRC_FILE: |
10002 | return io_sqe_files_register(ctx, u64_to_user_ptr(rr.data), | |
10003 | rr.nr, u64_to_user_ptr(rr.tags)); | |
634d00df PB |
10004 | case IORING_RSRC_BUFFER: |
10005 | return io_sqe_buffers_register(ctx, u64_to_user_ptr(rr.data), | |
10006 | rr.nr, u64_to_user_ptr(rr.tags)); | |
792e3582 PB |
10007 | } |
10008 | return -EINVAL; | |
10009 | } | |
10010 | ||
fe76421d JA |
10011 | static int io_register_iowq_aff(struct io_ring_ctx *ctx, void __user *arg, |
10012 | unsigned len) | |
10013 | { | |
10014 | struct io_uring_task *tctx = current->io_uring; | |
10015 | cpumask_var_t new_mask; | |
10016 | int ret; | |
10017 | ||
10018 | if (!tctx || !tctx->io_wq) | |
10019 | return -EINVAL; | |
10020 | ||
10021 | if (!alloc_cpumask_var(&new_mask, GFP_KERNEL)) | |
10022 | return -ENOMEM; | |
10023 | ||
10024 | cpumask_clear(new_mask); | |
10025 | if (len > cpumask_size()) | |
10026 | len = cpumask_size(); | |
10027 | ||
10028 | if (copy_from_user(new_mask, arg, len)) { | |
10029 | free_cpumask_var(new_mask); | |
10030 | return -EFAULT; | |
10031 | } | |
10032 | ||
10033 | ret = io_wq_cpu_affinity(tctx->io_wq, new_mask); | |
10034 | free_cpumask_var(new_mask); | |
10035 | return ret; | |
10036 | } | |
10037 | ||
10038 | static int io_unregister_iowq_aff(struct io_ring_ctx *ctx) | |
10039 | { | |
10040 | struct io_uring_task *tctx = current->io_uring; | |
10041 | ||
10042 | if (!tctx || !tctx->io_wq) | |
10043 | return -EINVAL; | |
10044 | ||
10045 | return io_wq_cpu_affinity(tctx->io_wq, NULL); | |
10046 | } | |
10047 | ||
071698e1 JA |
10048 | static bool io_register_op_must_quiesce(int op) |
10049 | { | |
10050 | switch (op) { | |
bd54b6fe BM |
10051 | case IORING_REGISTER_BUFFERS: |
10052 | case IORING_UNREGISTER_BUFFERS: | |
f4f7d21c | 10053 | case IORING_REGISTER_FILES: |
071698e1 JA |
10054 | case IORING_UNREGISTER_FILES: |
10055 | case IORING_REGISTER_FILES_UPDATE: | |
10056 | case IORING_REGISTER_PROBE: | |
10057 | case IORING_REGISTER_PERSONALITY: | |
10058 | case IORING_UNREGISTER_PERSONALITY: | |
992da01a PB |
10059 | case IORING_REGISTER_FILES2: |
10060 | case IORING_REGISTER_FILES_UPDATE2: | |
10061 | case IORING_REGISTER_BUFFERS2: | |
10062 | case IORING_REGISTER_BUFFERS_UPDATE: | |
fe76421d JA |
10063 | case IORING_REGISTER_IOWQ_AFF: |
10064 | case IORING_UNREGISTER_IOWQ_AFF: | |
071698e1 JA |
10065 | return false; |
10066 | default: | |
10067 | return true; | |
10068 | } | |
10069 | } | |
10070 | ||
e73c5c7c PB |
10071 | static int io_ctx_quiesce(struct io_ring_ctx *ctx) |
10072 | { | |
10073 | long ret; | |
10074 | ||
10075 | percpu_ref_kill(&ctx->refs); | |
10076 | ||
10077 | /* | |
10078 | * Drop uring mutex before waiting for references to exit. If another | |
10079 | * thread is currently inside io_uring_enter() it might need to grab the | |
10080 | * uring_lock to make progress. If we hold it here across the drain | |
10081 | * wait, then we can deadlock. It's safe to drop the mutex here, since | |
10082 | * no new references will come in after we've killed the percpu ref. | |
10083 | */ | |
10084 | mutex_unlock(&ctx->uring_lock); | |
10085 | do { | |
10086 | ret = wait_for_completion_interruptible(&ctx->ref_comp); | |
10087 | if (!ret) | |
10088 | break; | |
10089 | ret = io_run_task_work_sig(); | |
10090 | } while (ret >= 0); | |
10091 | mutex_lock(&ctx->uring_lock); | |
10092 | ||
10093 | if (ret) | |
10094 | io_refs_resurrect(&ctx->refs, &ctx->ref_comp); | |
10095 | return ret; | |
10096 | } | |
10097 | ||
edafccee JA |
10098 | static int __io_uring_register(struct io_ring_ctx *ctx, unsigned opcode, |
10099 | void __user *arg, unsigned nr_args) | |
b19062a5 JA |
10100 | __releases(ctx->uring_lock) |
10101 | __acquires(ctx->uring_lock) | |
edafccee JA |
10102 | { |
10103 | int ret; | |
10104 | ||
35fa71a0 JA |
10105 | /* |
10106 | * We're inside the ring mutex, if the ref is already dying, then | |
10107 | * someone else killed the ctx or is already going through | |
10108 | * io_uring_register(). | |
10109 | */ | |
10110 | if (percpu_ref_is_dying(&ctx->refs)) | |
10111 | return -ENXIO; | |
10112 | ||
75c4021a PB |
10113 | if (ctx->restricted) { |
10114 | if (opcode >= IORING_REGISTER_LAST) | |
10115 | return -EINVAL; | |
10116 | opcode = array_index_nospec(opcode, IORING_REGISTER_LAST); | |
10117 | if (!test_bit(opcode, ctx->restrictions.register_op)) | |
10118 | return -EACCES; | |
10119 | } | |
10120 | ||
071698e1 | 10121 | if (io_register_op_must_quiesce(opcode)) { |
e73c5c7c PB |
10122 | ret = io_ctx_quiesce(ctx); |
10123 | if (ret) | |
f70865db | 10124 | return ret; |
05f3fb3c | 10125 | } |
edafccee JA |
10126 | |
10127 | switch (opcode) { | |
10128 | case IORING_REGISTER_BUFFERS: | |
634d00df | 10129 | ret = io_sqe_buffers_register(ctx, arg, nr_args, NULL); |
edafccee JA |
10130 | break; |
10131 | case IORING_UNREGISTER_BUFFERS: | |
10132 | ret = -EINVAL; | |
10133 | if (arg || nr_args) | |
10134 | break; | |
0a96bbe4 | 10135 | ret = io_sqe_buffers_unregister(ctx); |
edafccee | 10136 | break; |
6b06314c | 10137 | case IORING_REGISTER_FILES: |
792e3582 | 10138 | ret = io_sqe_files_register(ctx, arg, nr_args, NULL); |
6b06314c JA |
10139 | break; |
10140 | case IORING_UNREGISTER_FILES: | |
10141 | ret = -EINVAL; | |
10142 | if (arg || nr_args) | |
10143 | break; | |
10144 | ret = io_sqe_files_unregister(ctx); | |
10145 | break; | |
c3a31e60 | 10146 | case IORING_REGISTER_FILES_UPDATE: |
c3bdad02 | 10147 | ret = io_register_files_update(ctx, arg, nr_args); |
c3a31e60 | 10148 | break; |
9b402849 | 10149 | case IORING_REGISTER_EVENTFD: |
f2842ab5 | 10150 | case IORING_REGISTER_EVENTFD_ASYNC: |
9b402849 JA |
10151 | ret = -EINVAL; |
10152 | if (nr_args != 1) | |
10153 | break; | |
10154 | ret = io_eventfd_register(ctx, arg); | |
f2842ab5 JA |
10155 | if (ret) |
10156 | break; | |
10157 | if (opcode == IORING_REGISTER_EVENTFD_ASYNC) | |
10158 | ctx->eventfd_async = 1; | |
10159 | else | |
10160 | ctx->eventfd_async = 0; | |
9b402849 JA |
10161 | break; |
10162 | case IORING_UNREGISTER_EVENTFD: | |
10163 | ret = -EINVAL; | |
10164 | if (arg || nr_args) | |
10165 | break; | |
10166 | ret = io_eventfd_unregister(ctx); | |
10167 | break; | |
66f4af93 JA |
10168 | case IORING_REGISTER_PROBE: |
10169 | ret = -EINVAL; | |
10170 | if (!arg || nr_args > 256) | |
10171 | break; | |
10172 | ret = io_probe(ctx, arg, nr_args); | |
10173 | break; | |
071698e1 JA |
10174 | case IORING_REGISTER_PERSONALITY: |
10175 | ret = -EINVAL; | |
10176 | if (arg || nr_args) | |
10177 | break; | |
10178 | ret = io_register_personality(ctx); | |
10179 | break; | |
10180 | case IORING_UNREGISTER_PERSONALITY: | |
10181 | ret = -EINVAL; | |
10182 | if (arg) | |
10183 | break; | |
10184 | ret = io_unregister_personality(ctx, nr_args); | |
10185 | break; | |
7e84e1c7 SG |
10186 | case IORING_REGISTER_ENABLE_RINGS: |
10187 | ret = -EINVAL; | |
10188 | if (arg || nr_args) | |
10189 | break; | |
10190 | ret = io_register_enable_rings(ctx); | |
10191 | break; | |
21b55dbc SG |
10192 | case IORING_REGISTER_RESTRICTIONS: |
10193 | ret = io_register_restrictions(ctx, arg, nr_args); | |
10194 | break; | |
992da01a PB |
10195 | case IORING_REGISTER_FILES2: |
10196 | ret = io_register_rsrc(ctx, arg, nr_args, IORING_RSRC_FILE); | |
10197 | break; | |
10198 | case IORING_REGISTER_FILES_UPDATE2: | |
10199 | ret = io_register_rsrc_update(ctx, arg, nr_args, | |
10200 | IORING_RSRC_FILE); | |
10201 | break; | |
10202 | case IORING_REGISTER_BUFFERS2: | |
10203 | ret = io_register_rsrc(ctx, arg, nr_args, IORING_RSRC_BUFFER); | |
792e3582 | 10204 | break; |
992da01a PB |
10205 | case IORING_REGISTER_BUFFERS_UPDATE: |
10206 | ret = io_register_rsrc_update(ctx, arg, nr_args, | |
10207 | IORING_RSRC_BUFFER); | |
c3bdad02 | 10208 | break; |
fe76421d JA |
10209 | case IORING_REGISTER_IOWQ_AFF: |
10210 | ret = -EINVAL; | |
10211 | if (!arg || !nr_args) | |
10212 | break; | |
10213 | ret = io_register_iowq_aff(ctx, arg, nr_args); | |
10214 | break; | |
10215 | case IORING_UNREGISTER_IOWQ_AFF: | |
10216 | ret = -EINVAL; | |
10217 | if (arg || nr_args) | |
10218 | break; | |
10219 | ret = io_unregister_iowq_aff(ctx); | |
10220 | break; | |
edafccee JA |
10221 | default: |
10222 | ret = -EINVAL; | |
10223 | break; | |
10224 | } | |
10225 | ||
071698e1 | 10226 | if (io_register_op_must_quiesce(opcode)) { |
05f3fb3c | 10227 | /* bring the ctx back to life */ |
05f3fb3c | 10228 | percpu_ref_reinit(&ctx->refs); |
0f158b4c | 10229 | reinit_completion(&ctx->ref_comp); |
05f3fb3c | 10230 | } |
edafccee JA |
10231 | return ret; |
10232 | } | |
10233 | ||
10234 | SYSCALL_DEFINE4(io_uring_register, unsigned int, fd, unsigned int, opcode, | |
10235 | void __user *, arg, unsigned int, nr_args) | |
10236 | { | |
10237 | struct io_ring_ctx *ctx; | |
10238 | long ret = -EBADF; | |
10239 | struct fd f; | |
10240 | ||
10241 | f = fdget(fd); | |
10242 | if (!f.file) | |
10243 | return -EBADF; | |
10244 | ||
10245 | ret = -EOPNOTSUPP; | |
10246 | if (f.file->f_op != &io_uring_fops) | |
10247 | goto out_fput; | |
10248 | ||
10249 | ctx = f.file->private_data; | |
10250 | ||
b6c23dd5 PB |
10251 | io_run_task_work(); |
10252 | ||
edafccee JA |
10253 | mutex_lock(&ctx->uring_lock); |
10254 | ret = __io_uring_register(ctx, opcode, arg, nr_args); | |
10255 | mutex_unlock(&ctx->uring_lock); | |
c826bd7a DD |
10256 | trace_io_uring_register(ctx, opcode, ctx->nr_user_files, ctx->nr_user_bufs, |
10257 | ctx->cq_ev_fd != NULL, ret); | |
edafccee JA |
10258 | out_fput: |
10259 | fdput(f); | |
10260 | return ret; | |
10261 | } | |
10262 | ||
2b188cc1 JA |
10263 | static int __init io_uring_init(void) |
10264 | { | |
d7f62e82 SM |
10265 | #define __BUILD_BUG_VERIFY_ELEMENT(stype, eoffset, etype, ename) do { \ |
10266 | BUILD_BUG_ON(offsetof(stype, ename) != eoffset); \ | |
10267 | BUILD_BUG_ON(sizeof(etype) != sizeof_field(stype, ename)); \ | |
10268 | } while (0) | |
10269 | ||
10270 | #define BUILD_BUG_SQE_ELEM(eoffset, etype, ename) \ | |
10271 | __BUILD_BUG_VERIFY_ELEMENT(struct io_uring_sqe, eoffset, etype, ename) | |
10272 | BUILD_BUG_ON(sizeof(struct io_uring_sqe) != 64); | |
10273 | BUILD_BUG_SQE_ELEM(0, __u8, opcode); | |
10274 | BUILD_BUG_SQE_ELEM(1, __u8, flags); | |
10275 | BUILD_BUG_SQE_ELEM(2, __u16, ioprio); | |
10276 | BUILD_BUG_SQE_ELEM(4, __s32, fd); | |
10277 | BUILD_BUG_SQE_ELEM(8, __u64, off); | |
10278 | BUILD_BUG_SQE_ELEM(8, __u64, addr2); | |
10279 | BUILD_BUG_SQE_ELEM(16, __u64, addr); | |
7d67af2c | 10280 | BUILD_BUG_SQE_ELEM(16, __u64, splice_off_in); |
d7f62e82 SM |
10281 | BUILD_BUG_SQE_ELEM(24, __u32, len); |
10282 | BUILD_BUG_SQE_ELEM(28, __kernel_rwf_t, rw_flags); | |
10283 | BUILD_BUG_SQE_ELEM(28, /* compat */ int, rw_flags); | |
10284 | BUILD_BUG_SQE_ELEM(28, /* compat */ __u32, rw_flags); | |
10285 | BUILD_BUG_SQE_ELEM(28, __u32, fsync_flags); | |
5769a351 JX |
10286 | BUILD_BUG_SQE_ELEM(28, /* compat */ __u16, poll_events); |
10287 | BUILD_BUG_SQE_ELEM(28, __u32, poll32_events); | |
d7f62e82 SM |
10288 | BUILD_BUG_SQE_ELEM(28, __u32, sync_range_flags); |
10289 | BUILD_BUG_SQE_ELEM(28, __u32, msg_flags); | |
10290 | BUILD_BUG_SQE_ELEM(28, __u32, timeout_flags); | |
10291 | BUILD_BUG_SQE_ELEM(28, __u32, accept_flags); | |
10292 | BUILD_BUG_SQE_ELEM(28, __u32, cancel_flags); | |
10293 | BUILD_BUG_SQE_ELEM(28, __u32, open_flags); | |
10294 | BUILD_BUG_SQE_ELEM(28, __u32, statx_flags); | |
10295 | BUILD_BUG_SQE_ELEM(28, __u32, fadvise_advice); | |
7d67af2c | 10296 | BUILD_BUG_SQE_ELEM(28, __u32, splice_flags); |
d7f62e82 SM |
10297 | BUILD_BUG_SQE_ELEM(32, __u64, user_data); |
10298 | BUILD_BUG_SQE_ELEM(40, __u16, buf_index); | |
16340eab | 10299 | BUILD_BUG_SQE_ELEM(40, __u16, buf_group); |
d7f62e82 | 10300 | BUILD_BUG_SQE_ELEM(42, __u16, personality); |
7d67af2c | 10301 | BUILD_BUG_SQE_ELEM(44, __s32, splice_fd_in); |
d7f62e82 | 10302 | |
b0d658ec PB |
10303 | BUILD_BUG_ON(sizeof(struct io_uring_files_update) != |
10304 | sizeof(struct io_uring_rsrc_update)); | |
10305 | BUILD_BUG_ON(sizeof(struct io_uring_rsrc_update) > | |
10306 | sizeof(struct io_uring_rsrc_update2)); | |
10307 | /* should fit into one byte */ | |
10308 | BUILD_BUG_ON(SQE_VALID_FLAGS >= (1 << 8)); | |
10309 | ||
d3656344 | 10310 | BUILD_BUG_ON(ARRAY_SIZE(io_op_defs) != IORING_OP_LAST); |
84557871 | 10311 | BUILD_BUG_ON(__REQ_F_LAST_BIT >= 8 * sizeof(int)); |
16340eab | 10312 | |
91f245d5 JA |
10313 | req_cachep = KMEM_CACHE(io_kiocb, SLAB_HWCACHE_ALIGN | SLAB_PANIC | |
10314 | SLAB_ACCOUNT); | |
2b188cc1 JA |
10315 | return 0; |
10316 | }; | |
10317 | __initcall(io_uring_init); |