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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 | |
187f08c1 | 95 | /* only define max */ |
042b0d85 | 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 | |
187f08c1 | 100 | #define IO_RSRC_TAG_TABLE_SHIFT (PAGE_SHIFT - 3) |
2d091d62 PB |
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 | 301 | |
a1ab7b35 PB |
302 | struct io_submit_link { |
303 | struct io_kiocb *head; | |
304 | struct io_kiocb *last; | |
305 | }; | |
306 | ||
258b29a9 PB |
307 | struct io_submit_state { |
308 | struct blk_plug plug; | |
a1ab7b35 | 309 | struct io_submit_link link; |
258b29a9 PB |
310 | |
311 | /* | |
312 | * io_kiocb alloc cache | |
313 | */ | |
bf019da7 | 314 | void *reqs[IO_REQ_CACHE_SIZE]; |
258b29a9 PB |
315 | unsigned int free_reqs; |
316 | ||
317 | bool plug_started; | |
318 | ||
319 | /* | |
320 | * Batch completion logic | |
321 | */ | |
cd0ca2e0 PB |
322 | struct io_kiocb *compl_reqs[IO_COMPL_BATCH]; |
323 | unsigned int compl_nr; | |
324 | /* inline/task_work completion list, under ->uring_lock */ | |
325 | struct list_head free_list; | |
258b29a9 | 326 | |
258b29a9 PB |
327 | unsigned int ios_left; |
328 | }; | |
329 | ||
2b188cc1 | 330 | struct io_ring_ctx { |
b52ecf8c | 331 | /* const or read-mostly hot data */ |
2b188cc1 JA |
332 | struct { |
333 | struct percpu_ref refs; | |
2b188cc1 | 334 | |
b52ecf8c | 335 | struct io_rings *rings; |
2b188cc1 | 336 | unsigned int flags; |
e1d85334 | 337 | unsigned int compat: 1; |
e1d85334 RD |
338 | unsigned int drain_next: 1; |
339 | unsigned int eventfd_async: 1; | |
21b55dbc | 340 | unsigned int restricted: 1; |
f18ee4cf | 341 | unsigned int off_timeout_used: 1; |
10c66904 | 342 | unsigned int drain_active: 1; |
b52ecf8c | 343 | } ____cacheline_aligned_in_smp; |
2b188cc1 | 344 | |
7f1129d2 | 345 | /* submission data */ |
b52ecf8c | 346 | struct { |
0499e582 PB |
347 | struct mutex uring_lock; |
348 | ||
75b28aff HV |
349 | /* |
350 | * Ring buffer of indices into array of io_uring_sqe, which is | |
351 | * mmapped by the application using the IORING_OFF_SQES offset. | |
352 | * | |
353 | * This indirection could e.g. be used to assign fixed | |
354 | * io_uring_sqe entries to operations and only submit them to | |
355 | * the queue when needed. | |
356 | * | |
357 | * The kernel modifies neither the indices array nor the entries | |
358 | * array. | |
359 | */ | |
360 | u32 *sq_array; | |
c7af47cf | 361 | struct io_uring_sqe *sq_sqes; |
2b188cc1 JA |
362 | unsigned cached_sq_head; |
363 | unsigned sq_entries; | |
de0617e4 | 364 | struct list_head defer_list; |
7f1129d2 PB |
365 | |
366 | /* | |
367 | * Fixed resources fast path, should be accessed only under | |
368 | * uring_lock, and updated through io_uring_register(2) | |
369 | */ | |
370 | struct io_rsrc_node *rsrc_node; | |
371 | struct io_file_table file_table; | |
372 | unsigned nr_user_files; | |
373 | unsigned nr_user_bufs; | |
374 | struct io_mapped_ubuf **user_bufs; | |
375 | ||
376 | struct io_submit_state submit_state; | |
5262f567 | 377 | struct list_head timeout_list; |
ef9dd637 | 378 | struct list_head ltimeout_list; |
1d7bb1d5 | 379 | struct list_head cq_overflow_list; |
7f1129d2 PB |
380 | struct xarray io_buffers; |
381 | struct xarray personalities; | |
382 | u32 pers_next; | |
383 | unsigned sq_thread_idle; | |
2b188cc1 JA |
384 | } ____cacheline_aligned_in_smp; |
385 | ||
d0acdee2 PB |
386 | /* IRQ completion list, under ->completion_lock */ |
387 | struct list_head locked_free_list; | |
388 | unsigned int locked_free_nr; | |
3c1a2ead | 389 | |
7c30f36a | 390 | const struct cred *sq_creds; /* cred used for __io_sq_thread() */ |
534ca6d6 JA |
391 | struct io_sq_data *sq_data; /* if using sq thread polling */ |
392 | ||
90554200 | 393 | struct wait_queue_head sqo_sq_wait; |
69fb2131 | 394 | struct list_head sqd_list; |
75b28aff | 395 | |
5ed7a37d PB |
396 | unsigned long check_cq_overflow; |
397 | ||
206aefde JA |
398 | struct { |
399 | unsigned cached_cq_tail; | |
400 | unsigned cq_entries; | |
0499e582 | 401 | struct eventfd_ctx *cq_ev_fd; |
311997b3 | 402 | struct wait_queue_head poll_wait; |
0499e582 PB |
403 | struct wait_queue_head cq_wait; |
404 | unsigned cq_extra; | |
405 | atomic_t cq_timeouts; | |
206aefde | 406 | struct fasync_struct *cq_fasync; |
0499e582 | 407 | unsigned cq_last_tm_flush; |
206aefde | 408 | } ____cacheline_aligned_in_smp; |
2b188cc1 | 409 | |
2b188cc1 JA |
410 | struct { |
411 | spinlock_t completion_lock; | |
e94f141b | 412 | |
89850fce JA |
413 | spinlock_t timeout_lock; |
414 | ||
def596e9 | 415 | /* |
540e32a0 | 416 | * ->iopoll_list is protected by the ctx->uring_lock for |
def596e9 JA |
417 | * io_uring instances that don't use IORING_SETUP_SQPOLL. |
418 | * For SQPOLL, only the single threaded io_sq_thread() will | |
419 | * manipulate the list, hence no extra locking is needed there. | |
420 | */ | |
540e32a0 | 421 | struct list_head iopoll_list; |
78076bb6 JA |
422 | struct hlist_head *cancel_hash; |
423 | unsigned cancel_hash_bits; | |
915b3dde | 424 | bool poll_multi_queue; |
2b188cc1 | 425 | } ____cacheline_aligned_in_smp; |
85faa7b8 | 426 | |
21b55dbc | 427 | struct io_restriction restrictions; |
3c1a2ead | 428 | |
b13a8918 PB |
429 | /* slow path rsrc auxilary data, used by update/register */ |
430 | struct { | |
431 | struct io_rsrc_node *rsrc_backup_node; | |
432 | struct io_mapped_ubuf *dummy_ubuf; | |
433 | struct io_rsrc_data *file_data; | |
434 | struct io_rsrc_data *buf_data; | |
435 | ||
436 | struct delayed_work rsrc_put_work; | |
437 | struct llist_head rsrc_put_llist; | |
438 | struct list_head rsrc_ref_list; | |
439 | spinlock_t rsrc_ref_lock; | |
440 | }; | |
441 | ||
3c1a2ead | 442 | /* Keep this last, we don't need it for the fast path */ |
b986af7e PB |
443 | struct { |
444 | #if defined(CONFIG_UNIX) | |
445 | struct socket *ring_sock; | |
446 | #endif | |
447 | /* hashed buffered write serialization */ | |
448 | struct io_wq_hash *hash_map; | |
449 | ||
450 | /* Only used for accounting purposes */ | |
451 | struct user_struct *user; | |
452 | struct mm_struct *mm_account; | |
453 | ||
454 | /* ctx exit and cancelation */ | |
9011bf9a PB |
455 | struct llist_head fallback_llist; |
456 | struct delayed_work fallback_work; | |
b986af7e PB |
457 | struct work_struct exit_work; |
458 | struct list_head tctx_list; | |
459 | struct completion ref_comp; | |
460 | }; | |
2b188cc1 JA |
461 | }; |
462 | ||
53e043b2 SM |
463 | struct io_uring_task { |
464 | /* submission side */ | |
09899b19 | 465 | int cached_refs; |
53e043b2 SM |
466 | struct xarray xa; |
467 | struct wait_queue_head wait; | |
ee53fb2b SM |
468 | const struct io_ring_ctx *last; |
469 | struct io_wq *io_wq; | |
53e043b2 | 470 | struct percpu_counter inflight; |
b303fe2e | 471 | atomic_t inflight_tracked; |
53e043b2 | 472 | atomic_t in_idle; |
53e043b2 SM |
473 | |
474 | spinlock_t task_lock; | |
475 | struct io_wq_work_list task_list; | |
53e043b2 | 476 | struct callback_head task_work; |
6294f368 | 477 | bool task_running; |
53e043b2 SM |
478 | }; |
479 | ||
09bb8394 JA |
480 | /* |
481 | * First field must be the file pointer in all the | |
482 | * iocb unions! See also 'struct kiocb' in <linux/fs.h> | |
483 | */ | |
221c5eb2 JA |
484 | struct io_poll_iocb { |
485 | struct file *file; | |
018043be | 486 | struct wait_queue_head *head; |
221c5eb2 | 487 | __poll_t events; |
8c838788 | 488 | bool done; |
221c5eb2 | 489 | bool canceled; |
392edb45 | 490 | struct wait_queue_entry wait; |
221c5eb2 JA |
491 | }; |
492 | ||
9d805892 | 493 | struct io_poll_update { |
018043be | 494 | struct file *file; |
9d805892 PB |
495 | u64 old_user_data; |
496 | u64 new_user_data; | |
497 | __poll_t events; | |
b69de288 JA |
498 | bool update_events; |
499 | bool update_user_data; | |
018043be PB |
500 | }; |
501 | ||
b5dba59e JA |
502 | struct io_close { |
503 | struct file *file; | |
b5dba59e JA |
504 | int fd; |
505 | }; | |
506 | ||
ad8a48ac JA |
507 | struct io_timeout_data { |
508 | struct io_kiocb *req; | |
509 | struct hrtimer timer; | |
510 | struct timespec64 ts; | |
511 | enum hrtimer_mode mode; | |
50c1df2b | 512 | u32 flags; |
ad8a48ac JA |
513 | }; |
514 | ||
8ed8d3c3 JA |
515 | struct io_accept { |
516 | struct file *file; | |
517 | struct sockaddr __user *addr; | |
518 | int __user *addr_len; | |
519 | int flags; | |
aaa4db12 | 520 | u32 file_slot; |
09952e3e | 521 | unsigned long nofile; |
8ed8d3c3 JA |
522 | }; |
523 | ||
524 | struct io_sync { | |
525 | struct file *file; | |
526 | loff_t len; | |
527 | loff_t off; | |
528 | int flags; | |
d63d1b5e | 529 | int mode; |
8ed8d3c3 JA |
530 | }; |
531 | ||
fbf23849 JA |
532 | struct io_cancel { |
533 | struct file *file; | |
534 | u64 addr; | |
535 | }; | |
536 | ||
b29472ee JA |
537 | struct io_timeout { |
538 | struct file *file; | |
bfe68a22 PB |
539 | u32 off; |
540 | u32 target_seq; | |
135fcde8 | 541 | struct list_head list; |
90cd7e42 PB |
542 | /* head of the link, used by linked timeouts only */ |
543 | struct io_kiocb *head; | |
89b263f6 JA |
544 | /* for linked completions */ |
545 | struct io_kiocb *prev; | |
b29472ee JA |
546 | }; |
547 | ||
0bdf7a2d PB |
548 | struct io_timeout_rem { |
549 | struct file *file; | |
550 | u64 addr; | |
9c8e11b3 PB |
551 | |
552 | /* timeout update */ | |
553 | struct timespec64 ts; | |
554 | u32 flags; | |
f1042b6c | 555 | bool ltimeout; |
0bdf7a2d PB |
556 | }; |
557 | ||
9adbd45d JA |
558 | struct io_rw { |
559 | /* NOTE: kiocb has the file as the first member, so don't do it here */ | |
560 | struct kiocb kiocb; | |
561 | u64 addr; | |
562 | u64 len; | |
563 | }; | |
564 | ||
3fbb51c1 JA |
565 | struct io_connect { |
566 | struct file *file; | |
567 | struct sockaddr __user *addr; | |
568 | int addr_len; | |
569 | }; | |
570 | ||
e47293fd JA |
571 | struct io_sr_msg { |
572 | struct file *file; | |
fddaface | 573 | union { |
4af3417a PB |
574 | struct compat_msghdr __user *umsg_compat; |
575 | struct user_msghdr __user *umsg; | |
576 | void __user *buf; | |
fddaface | 577 | }; |
e47293fd | 578 | int msg_flags; |
bcda7baa | 579 | int bgid; |
fddaface | 580 | size_t len; |
bcda7baa | 581 | struct io_buffer *kbuf; |
e47293fd JA |
582 | }; |
583 | ||
15b71abe JA |
584 | struct io_open { |
585 | struct file *file; | |
586 | int dfd; | |
b9445598 | 587 | u32 file_slot; |
15b71abe | 588 | struct filename *filename; |
c12cedf2 | 589 | struct open_how how; |
4022e7af | 590 | unsigned long nofile; |
15b71abe JA |
591 | }; |
592 | ||
269bbe5f | 593 | struct io_rsrc_update { |
05f3fb3c JA |
594 | struct file *file; |
595 | u64 arg; | |
596 | u32 nr_args; | |
597 | u32 offset; | |
598 | }; | |
599 | ||
4840e418 JA |
600 | struct io_fadvise { |
601 | struct file *file; | |
602 | u64 offset; | |
603 | u32 len; | |
604 | u32 advice; | |
605 | }; | |
606 | ||
c1ca757b JA |
607 | struct io_madvise { |
608 | struct file *file; | |
609 | u64 addr; | |
610 | u32 len; | |
611 | u32 advice; | |
612 | }; | |
613 | ||
3e4827b0 JA |
614 | struct io_epoll { |
615 | struct file *file; | |
616 | int epfd; | |
617 | int op; | |
618 | int fd; | |
619 | struct epoll_event event; | |
e47293fd JA |
620 | }; |
621 | ||
7d67af2c PB |
622 | struct io_splice { |
623 | struct file *file_out; | |
624 | struct file *file_in; | |
625 | loff_t off_out; | |
626 | loff_t off_in; | |
627 | u64 len; | |
628 | unsigned int flags; | |
629 | }; | |
630 | ||
ddf0322d JA |
631 | struct io_provide_buf { |
632 | struct file *file; | |
633 | __u64 addr; | |
38134ada | 634 | __u32 len; |
ddf0322d JA |
635 | __u32 bgid; |
636 | __u16 nbufs; | |
637 | __u16 bid; | |
638 | }; | |
639 | ||
1d9e1288 BM |
640 | struct io_statx { |
641 | struct file *file; | |
642 | int dfd; | |
643 | unsigned int mask; | |
644 | unsigned int flags; | |
e62753e4 | 645 | const char __user *filename; |
1d9e1288 BM |
646 | struct statx __user *buffer; |
647 | }; | |
648 | ||
36f4fa68 JA |
649 | struct io_shutdown { |
650 | struct file *file; | |
651 | int how; | |
652 | }; | |
653 | ||
80a261fd JA |
654 | struct io_rename { |
655 | struct file *file; | |
656 | int old_dfd; | |
657 | int new_dfd; | |
658 | struct filename *oldpath; | |
659 | struct filename *newpath; | |
660 | int flags; | |
661 | }; | |
662 | ||
14a1143b JA |
663 | struct io_unlink { |
664 | struct file *file; | |
665 | int dfd; | |
666 | int flags; | |
667 | struct filename *filename; | |
668 | }; | |
669 | ||
3ca405eb PB |
670 | struct io_completion { |
671 | struct file *file; | |
8c3f9cd1 | 672 | u32 cflags; |
3ca405eb PB |
673 | }; |
674 | ||
f499a021 JA |
675 | struct io_async_connect { |
676 | struct sockaddr_storage address; | |
677 | }; | |
678 | ||
03b1230c JA |
679 | struct io_async_msghdr { |
680 | struct iovec fast_iov[UIO_FASTIOV]; | |
257e84a5 PB |
681 | /* points to an allocated iov, if NULL we use fast_iov instead */ |
682 | struct iovec *free_iov; | |
03b1230c JA |
683 | struct sockaddr __user *uaddr; |
684 | struct msghdr msg; | |
b537916c | 685 | struct sockaddr_storage addr; |
03b1230c JA |
686 | }; |
687 | ||
f67676d1 JA |
688 | struct io_async_rw { |
689 | struct iovec fast_iov[UIO_FASTIOV]; | |
ff6165b2 JA |
690 | const struct iovec *free_iovec; |
691 | struct iov_iter iter; | |
227c0c96 | 692 | size_t bytes_done; |
bcf5a063 | 693 | struct wait_page_queue wpq; |
f67676d1 JA |
694 | }; |
695 | ||
6b47ee6e PB |
696 | enum { |
697 | REQ_F_FIXED_FILE_BIT = IOSQE_FIXED_FILE_BIT, | |
698 | REQ_F_IO_DRAIN_BIT = IOSQE_IO_DRAIN_BIT, | |
699 | REQ_F_LINK_BIT = IOSQE_IO_LINK_BIT, | |
700 | REQ_F_HARDLINK_BIT = IOSQE_IO_HARDLINK_BIT, | |
701 | REQ_F_FORCE_ASYNC_BIT = IOSQE_ASYNC_BIT, | |
bcda7baa | 702 | REQ_F_BUFFER_SELECT_BIT = IOSQE_BUFFER_SELECT_BIT, |
6b47ee6e | 703 | |
dddca226 | 704 | /* first byte is taken by user flags, shift it to not overlap */ |
93d2bcd2 | 705 | REQ_F_FAIL_BIT = 8, |
6b47ee6e PB |
706 | REQ_F_INFLIGHT_BIT, |
707 | REQ_F_CUR_POS_BIT, | |
708 | REQ_F_NOWAIT_BIT, | |
6b47ee6e | 709 | REQ_F_LINK_TIMEOUT_BIT, |
99bc4c38 | 710 | REQ_F_NEED_CLEANUP_BIT, |
d7718a9d | 711 | REQ_F_POLLED_BIT, |
bcda7baa | 712 | REQ_F_BUFFER_SELECTED_BIT, |
e342c807 | 713 | REQ_F_COMPLETE_INLINE_BIT, |
230d50d4 | 714 | REQ_F_REISSUE_BIT, |
8c130827 | 715 | REQ_F_DONT_REISSUE_BIT, |
b8e64b53 | 716 | REQ_F_CREDS_BIT, |
20e60a38 | 717 | REQ_F_REFCOUNT_BIT, |
4d13d1a4 | 718 | REQ_F_ARM_LTIMEOUT_BIT, |
7b29f92d | 719 | /* keep async read/write and isreg together and in order */ |
b191e2df PB |
720 | REQ_F_NOWAIT_READ_BIT, |
721 | REQ_F_NOWAIT_WRITE_BIT, | |
7b29f92d | 722 | REQ_F_ISREG_BIT, |
84557871 JA |
723 | |
724 | /* not a real bit, just to check we're not overflowing the space */ | |
725 | __REQ_F_LAST_BIT, | |
6b47ee6e PB |
726 | }; |
727 | ||
728 | enum { | |
729 | /* ctx owns file */ | |
730 | REQ_F_FIXED_FILE = BIT(REQ_F_FIXED_FILE_BIT), | |
731 | /* drain existing IO first */ | |
732 | REQ_F_IO_DRAIN = BIT(REQ_F_IO_DRAIN_BIT), | |
733 | /* linked sqes */ | |
734 | REQ_F_LINK = BIT(REQ_F_LINK_BIT), | |
735 | /* doesn't sever on completion < 0 */ | |
736 | REQ_F_HARDLINK = BIT(REQ_F_HARDLINK_BIT), | |
737 | /* IOSQE_ASYNC */ | |
738 | REQ_F_FORCE_ASYNC = BIT(REQ_F_FORCE_ASYNC_BIT), | |
bcda7baa JA |
739 | /* IOSQE_BUFFER_SELECT */ |
740 | REQ_F_BUFFER_SELECT = BIT(REQ_F_BUFFER_SELECT_BIT), | |
6b47ee6e | 741 | |
6b47ee6e | 742 | /* fail rest of links */ |
93d2bcd2 | 743 | REQ_F_FAIL = BIT(REQ_F_FAIL_BIT), |
b05a1bcd | 744 | /* on inflight list, should be cancelled and waited on exit reliably */ |
6b47ee6e PB |
745 | REQ_F_INFLIGHT = BIT(REQ_F_INFLIGHT_BIT), |
746 | /* read/write uses file position */ | |
747 | REQ_F_CUR_POS = BIT(REQ_F_CUR_POS_BIT), | |
748 | /* must not punt to workers */ | |
749 | REQ_F_NOWAIT = BIT(REQ_F_NOWAIT_BIT), | |
900fad45 | 750 | /* has or had linked timeout */ |
6b47ee6e | 751 | REQ_F_LINK_TIMEOUT = BIT(REQ_F_LINK_TIMEOUT_BIT), |
99bc4c38 PB |
752 | /* needs cleanup */ |
753 | REQ_F_NEED_CLEANUP = BIT(REQ_F_NEED_CLEANUP_BIT), | |
d7718a9d JA |
754 | /* already went through poll handler */ |
755 | REQ_F_POLLED = BIT(REQ_F_POLLED_BIT), | |
bcda7baa JA |
756 | /* buffer already selected */ |
757 | REQ_F_BUFFER_SELECTED = BIT(REQ_F_BUFFER_SELECTED_BIT), | |
e342c807 PB |
758 | /* completion is deferred through io_comp_state */ |
759 | REQ_F_COMPLETE_INLINE = BIT(REQ_F_COMPLETE_INLINE_BIT), | |
230d50d4 JA |
760 | /* caller should reissue async */ |
761 | REQ_F_REISSUE = BIT(REQ_F_REISSUE_BIT), | |
8c130827 PB |
762 | /* don't attempt request reissue, see io_rw_reissue() */ |
763 | REQ_F_DONT_REISSUE = BIT(REQ_F_DONT_REISSUE_BIT), | |
7b29f92d | 764 | /* supports async reads */ |
b191e2df | 765 | REQ_F_NOWAIT_READ = BIT(REQ_F_NOWAIT_READ_BIT), |
7b29f92d | 766 | /* supports async writes */ |
b191e2df | 767 | REQ_F_NOWAIT_WRITE = BIT(REQ_F_NOWAIT_WRITE_BIT), |
7b29f92d JA |
768 | /* regular file */ |
769 | REQ_F_ISREG = BIT(REQ_F_ISREG_BIT), | |
b8e64b53 PB |
770 | /* has creds assigned */ |
771 | REQ_F_CREDS = BIT(REQ_F_CREDS_BIT), | |
20e60a38 PB |
772 | /* skip refcounting if not set */ |
773 | REQ_F_REFCOUNT = BIT(REQ_F_REFCOUNT_BIT), | |
4d13d1a4 PB |
774 | /* there is a linked timeout that has to be armed */ |
775 | REQ_F_ARM_LTIMEOUT = BIT(REQ_F_ARM_LTIMEOUT_BIT), | |
d7718a9d JA |
776 | }; |
777 | ||
778 | struct async_poll { | |
779 | struct io_poll_iocb poll; | |
807abcb0 | 780 | struct io_poll_iocb *double_poll; |
6b47ee6e PB |
781 | }; |
782 | ||
f237c30a | 783 | typedef void (*io_req_tw_func_t)(struct io_kiocb *req, bool *locked); |
5b0a6acc | 784 | |
7cbf1722 | 785 | struct io_task_work { |
5b0a6acc PB |
786 | union { |
787 | struct io_wq_work_node node; | |
788 | struct llist_node fallback_node; | |
789 | }; | |
790 | io_req_tw_func_t func; | |
7cbf1722 JA |
791 | }; |
792 | ||
992da01a PB |
793 | enum { |
794 | IORING_RSRC_FILE = 0, | |
795 | IORING_RSRC_BUFFER = 1, | |
796 | }; | |
797 | ||
09bb8394 JA |
798 | /* |
799 | * NOTE! Each of the iocb union members has the file pointer | |
800 | * as the first entry in their struct definition. So you can | |
801 | * access the file pointer through any of the sub-structs, | |
802 | * or directly as just 'ki_filp' in this struct. | |
803 | */ | |
2b188cc1 | 804 | struct io_kiocb { |
221c5eb2 | 805 | union { |
09bb8394 | 806 | struct file *file; |
9adbd45d | 807 | struct io_rw rw; |
221c5eb2 | 808 | struct io_poll_iocb poll; |
9d805892 | 809 | struct io_poll_update poll_update; |
8ed8d3c3 JA |
810 | struct io_accept accept; |
811 | struct io_sync sync; | |
fbf23849 | 812 | struct io_cancel cancel; |
b29472ee | 813 | struct io_timeout timeout; |
0bdf7a2d | 814 | struct io_timeout_rem timeout_rem; |
3fbb51c1 | 815 | struct io_connect connect; |
e47293fd | 816 | struct io_sr_msg sr_msg; |
15b71abe | 817 | struct io_open open; |
b5dba59e | 818 | struct io_close close; |
269bbe5f | 819 | struct io_rsrc_update rsrc_update; |
4840e418 | 820 | struct io_fadvise fadvise; |
c1ca757b | 821 | struct io_madvise madvise; |
3e4827b0 | 822 | struct io_epoll epoll; |
7d67af2c | 823 | struct io_splice splice; |
ddf0322d | 824 | struct io_provide_buf pbuf; |
1d9e1288 | 825 | struct io_statx statx; |
36f4fa68 | 826 | struct io_shutdown shutdown; |
80a261fd | 827 | struct io_rename rename; |
14a1143b | 828 | struct io_unlink unlink; |
3ca405eb PB |
829 | /* use only after cleaning per-op data, see io_clean_op() */ |
830 | struct io_completion compl; | |
221c5eb2 | 831 | }; |
2b188cc1 | 832 | |
e8c2bc1f JA |
833 | /* opcode allocated if it needs to store data for async defer */ |
834 | void *async_data; | |
d625c6ee | 835 | u8 opcode; |
65a6543d XW |
836 | /* polled IO has completed */ |
837 | u8 iopoll_completed; | |
2b188cc1 | 838 | |
4f4eeba8 | 839 | u16 buf_index; |
9cf7c104 | 840 | u32 result; |
4f4eeba8 | 841 | |
010e8e6b PB |
842 | struct io_ring_ctx *ctx; |
843 | unsigned int flags; | |
abc54d63 | 844 | atomic_t refs; |
010e8e6b PB |
845 | struct task_struct *task; |
846 | u64 user_data; | |
d7718a9d | 847 | |
f2f87370 | 848 | struct io_kiocb *link; |
269bbe5f | 849 | struct percpu_ref *fixed_rsrc_refs; |
fcb323cc | 850 | |
b303fe2e | 851 | /* used with ctx->iopoll_list with reads/writes */ |
010e8e6b | 852 | struct list_head inflight_entry; |
5b0a6acc | 853 | struct io_task_work io_task_work; |
010e8e6b PB |
854 | /* for polled requests, i.e. IORING_OP_POLL_ADD and async armed poll */ |
855 | struct hlist_node hash_node; | |
856 | struct async_poll *apoll; | |
857 | struct io_wq_work work; | |
fe7e3257 | 858 | const struct cred *creds; |
c10d1f98 | 859 | |
eae071c9 PB |
860 | /* store used ubuf, so we can prevent reloading */ |
861 | struct io_mapped_ubuf *imu; | |
2b188cc1 | 862 | }; |
05589553 | 863 | |
13bf43f5 PB |
864 | struct io_tctx_node { |
865 | struct list_head ctx_node; | |
866 | struct task_struct *task; | |
13bf43f5 PB |
867 | struct io_ring_ctx *ctx; |
868 | }; | |
869 | ||
27dc8338 PB |
870 | struct io_defer_entry { |
871 | struct list_head list; | |
872 | struct io_kiocb *req; | |
9cf7c104 | 873 | u32 seq; |
2b188cc1 JA |
874 | }; |
875 | ||
d3656344 | 876 | struct io_op_def { |
d3656344 JA |
877 | /* needs req->file assigned */ |
878 | unsigned needs_file : 1; | |
d3656344 JA |
879 | /* hash wq insertion if file is a regular file */ |
880 | unsigned hash_reg_file : 1; | |
881 | /* unbound wq insertion if file is a non-regular file */ | |
882 | unsigned unbound_nonreg_file : 1; | |
66f4af93 JA |
883 | /* opcode is not supported by this kernel */ |
884 | unsigned not_supported : 1; | |
8a72758c JA |
885 | /* set if opcode supports polled "wait" */ |
886 | unsigned pollin : 1; | |
887 | unsigned pollout : 1; | |
bcda7baa JA |
888 | /* op supports buffer selection */ |
889 | unsigned buffer_select : 1; | |
26f0505a PB |
890 | /* do prep async if is going to be punted */ |
891 | unsigned needs_async_setup : 1; | |
27926b68 JA |
892 | /* should block plug */ |
893 | unsigned plug : 1; | |
e8c2bc1f JA |
894 | /* size of async data needed, if any */ |
895 | unsigned short async_size; | |
d3656344 JA |
896 | }; |
897 | ||
0918682b | 898 | static const struct io_op_def io_op_defs[] = { |
0463b6c5 PB |
899 | [IORING_OP_NOP] = {}, |
900 | [IORING_OP_READV] = { | |
d3656344 JA |
901 | .needs_file = 1, |
902 | .unbound_nonreg_file = 1, | |
8a72758c | 903 | .pollin = 1, |
4d954c25 | 904 | .buffer_select = 1, |
26f0505a | 905 | .needs_async_setup = 1, |
27926b68 | 906 | .plug = 1, |
e8c2bc1f | 907 | .async_size = sizeof(struct io_async_rw), |
d3656344 | 908 | }, |
0463b6c5 | 909 | [IORING_OP_WRITEV] = { |
d3656344 JA |
910 | .needs_file = 1, |
911 | .hash_reg_file = 1, | |
912 | .unbound_nonreg_file = 1, | |
8a72758c | 913 | .pollout = 1, |
26f0505a | 914 | .needs_async_setup = 1, |
27926b68 | 915 | .plug = 1, |
e8c2bc1f | 916 | .async_size = sizeof(struct io_async_rw), |
d3656344 | 917 | }, |
0463b6c5 | 918 | [IORING_OP_FSYNC] = { |
d3656344 JA |
919 | .needs_file = 1, |
920 | }, | |
0463b6c5 | 921 | [IORING_OP_READ_FIXED] = { |
d3656344 JA |
922 | .needs_file = 1, |
923 | .unbound_nonreg_file = 1, | |
8a72758c | 924 | .pollin = 1, |
27926b68 | 925 | .plug = 1, |
e8c2bc1f | 926 | .async_size = sizeof(struct io_async_rw), |
d3656344 | 927 | }, |
0463b6c5 | 928 | [IORING_OP_WRITE_FIXED] = { |
d3656344 JA |
929 | .needs_file = 1, |
930 | .hash_reg_file = 1, | |
931 | .unbound_nonreg_file = 1, | |
8a72758c | 932 | .pollout = 1, |
27926b68 | 933 | .plug = 1, |
e8c2bc1f | 934 | .async_size = sizeof(struct io_async_rw), |
d3656344 | 935 | }, |
0463b6c5 | 936 | [IORING_OP_POLL_ADD] = { |
d3656344 JA |
937 | .needs_file = 1, |
938 | .unbound_nonreg_file = 1, | |
939 | }, | |
0463b6c5 PB |
940 | [IORING_OP_POLL_REMOVE] = {}, |
941 | [IORING_OP_SYNC_FILE_RANGE] = { | |
d3656344 JA |
942 | .needs_file = 1, |
943 | }, | |
0463b6c5 | 944 | [IORING_OP_SENDMSG] = { |
d3656344 JA |
945 | .needs_file = 1, |
946 | .unbound_nonreg_file = 1, | |
8a72758c | 947 | .pollout = 1, |
26f0505a | 948 | .needs_async_setup = 1, |
e8c2bc1f | 949 | .async_size = sizeof(struct io_async_msghdr), |
d3656344 | 950 | }, |
0463b6c5 | 951 | [IORING_OP_RECVMSG] = { |
d3656344 JA |
952 | .needs_file = 1, |
953 | .unbound_nonreg_file = 1, | |
8a72758c | 954 | .pollin = 1, |
52de1fe1 | 955 | .buffer_select = 1, |
26f0505a | 956 | .needs_async_setup = 1, |
e8c2bc1f | 957 | .async_size = sizeof(struct io_async_msghdr), |
d3656344 | 958 | }, |
0463b6c5 | 959 | [IORING_OP_TIMEOUT] = { |
e8c2bc1f | 960 | .async_size = sizeof(struct io_timeout_data), |
d3656344 | 961 | }, |
9c8e11b3 PB |
962 | [IORING_OP_TIMEOUT_REMOVE] = { |
963 | /* used by timeout updates' prep() */ | |
9c8e11b3 | 964 | }, |
0463b6c5 | 965 | [IORING_OP_ACCEPT] = { |
d3656344 JA |
966 | .needs_file = 1, |
967 | .unbound_nonreg_file = 1, | |
8a72758c | 968 | .pollin = 1, |
d3656344 | 969 | }, |
0463b6c5 PB |
970 | [IORING_OP_ASYNC_CANCEL] = {}, |
971 | [IORING_OP_LINK_TIMEOUT] = { | |
e8c2bc1f | 972 | .async_size = sizeof(struct io_timeout_data), |
d3656344 | 973 | }, |
0463b6c5 | 974 | [IORING_OP_CONNECT] = { |
d3656344 JA |
975 | .needs_file = 1, |
976 | .unbound_nonreg_file = 1, | |
8a72758c | 977 | .pollout = 1, |
26f0505a | 978 | .needs_async_setup = 1, |
e8c2bc1f | 979 | .async_size = sizeof(struct io_async_connect), |
d3656344 | 980 | }, |
0463b6c5 | 981 | [IORING_OP_FALLOCATE] = { |
d3656344 | 982 | .needs_file = 1, |
d3656344 | 983 | }, |
44526bed JA |
984 | [IORING_OP_OPENAT] = {}, |
985 | [IORING_OP_CLOSE] = {}, | |
986 | [IORING_OP_FILES_UPDATE] = {}, | |
987 | [IORING_OP_STATX] = {}, | |
0463b6c5 | 988 | [IORING_OP_READ] = { |
3a6820f2 JA |
989 | .needs_file = 1, |
990 | .unbound_nonreg_file = 1, | |
8a72758c | 991 | .pollin = 1, |
bcda7baa | 992 | .buffer_select = 1, |
27926b68 | 993 | .plug = 1, |
e8c2bc1f | 994 | .async_size = sizeof(struct io_async_rw), |
3a6820f2 | 995 | }, |
0463b6c5 | 996 | [IORING_OP_WRITE] = { |
3a6820f2 | 997 | .needs_file = 1, |
7b3188e7 | 998 | .hash_reg_file = 1, |
3a6820f2 | 999 | .unbound_nonreg_file = 1, |
8a72758c | 1000 | .pollout = 1, |
27926b68 | 1001 | .plug = 1, |
e8c2bc1f | 1002 | .async_size = sizeof(struct io_async_rw), |
3a6820f2 | 1003 | }, |
0463b6c5 | 1004 | [IORING_OP_FADVISE] = { |
4840e418 | 1005 | .needs_file = 1, |
c1ca757b | 1006 | }, |
44526bed | 1007 | [IORING_OP_MADVISE] = {}, |
0463b6c5 | 1008 | [IORING_OP_SEND] = { |
fddaface JA |
1009 | .needs_file = 1, |
1010 | .unbound_nonreg_file = 1, | |
8a72758c | 1011 | .pollout = 1, |
fddaface | 1012 | }, |
0463b6c5 | 1013 | [IORING_OP_RECV] = { |
fddaface JA |
1014 | .needs_file = 1, |
1015 | .unbound_nonreg_file = 1, | |
8a72758c | 1016 | .pollin = 1, |
bcda7baa | 1017 | .buffer_select = 1, |
fddaface | 1018 | }, |
0463b6c5 | 1019 | [IORING_OP_OPENAT2] = { |
cebdb986 | 1020 | }, |
3e4827b0 JA |
1021 | [IORING_OP_EPOLL_CTL] = { |
1022 | .unbound_nonreg_file = 1, | |
3e4827b0 | 1023 | }, |
7d67af2c PB |
1024 | [IORING_OP_SPLICE] = { |
1025 | .needs_file = 1, | |
1026 | .hash_reg_file = 1, | |
1027 | .unbound_nonreg_file = 1, | |
ddf0322d JA |
1028 | }, |
1029 | [IORING_OP_PROVIDE_BUFFERS] = {}, | |
067524e9 | 1030 | [IORING_OP_REMOVE_BUFFERS] = {}, |
f2a8d5c7 PB |
1031 | [IORING_OP_TEE] = { |
1032 | .needs_file = 1, | |
1033 | .hash_reg_file = 1, | |
1034 | .unbound_nonreg_file = 1, | |
1035 | }, | |
36f4fa68 JA |
1036 | [IORING_OP_SHUTDOWN] = { |
1037 | .needs_file = 1, | |
1038 | }, | |
44526bed JA |
1039 | [IORING_OP_RENAMEAT] = {}, |
1040 | [IORING_OP_UNLINKAT] = {}, | |
d3656344 JA |
1041 | }; |
1042 | ||
0756a869 PB |
1043 | /* requests with any of those set should undergo io_disarm_next() */ |
1044 | #define IO_DISARM_MASK (REQ_F_ARM_LTIMEOUT | REQ_F_LINK_TIMEOUT | REQ_F_FAIL) | |
1045 | ||
7a612350 | 1046 | static bool io_disarm_next(struct io_kiocb *req); |
eef51daa | 1047 | static void io_uring_del_tctx_node(unsigned long index); |
9936c7c2 PB |
1048 | static void io_uring_try_cancel_requests(struct io_ring_ctx *ctx, |
1049 | struct task_struct *task, | |
3dd0c97a | 1050 | bool cancel_all); |
78cc687b | 1051 | static void io_uring_cancel_generic(bool cancel_all, struct io_sq_data *sqd); |
1ffc5422 | 1052 | |
d4d19c19 PB |
1053 | static bool io_cqring_fill_event(struct io_ring_ctx *ctx, u64 user_data, |
1054 | long res, unsigned int cflags); | |
ec9c02ad | 1055 | static void io_put_req(struct io_kiocb *req); |
91c2f697 | 1056 | static void io_put_req_deferred(struct io_kiocb *req); |
c7dae4ba | 1057 | static void io_dismantle_req(struct io_kiocb *req); |
94ae5e77 | 1058 | static void io_queue_linked_timeout(struct io_kiocb *req); |
fdecb662 | 1059 | static int __io_register_rsrc_update(struct io_ring_ctx *ctx, unsigned type, |
c3bdad02 | 1060 | struct io_uring_rsrc_update2 *up, |
98f0b3b4 | 1061 | unsigned nr_args); |
68fb8979 | 1062 | static void io_clean_op(struct io_kiocb *req); |
ac177053 | 1063 | static struct file *io_file_get(struct io_ring_ctx *ctx, |
8371adf5 | 1064 | struct io_kiocb *req, int fd, bool fixed); |
c5eef2b9 | 1065 | static void __io_queue_sqe(struct io_kiocb *req); |
269bbe5f | 1066 | static void io_rsrc_put_work(struct work_struct *work); |
de0617e4 | 1067 | |
907d1df3 | 1068 | static void io_req_task_queue(struct io_kiocb *req); |
2a2758f2 | 1069 | static void io_submit_flush_completions(struct io_ring_ctx *ctx); |
179ae0d1 | 1070 | static int io_req_prep_async(struct io_kiocb *req); |
de0617e4 | 1071 | |
b9445598 PB |
1072 | static int io_install_fixed_file(struct io_kiocb *req, struct file *file, |
1073 | unsigned int issue_flags, u32 slot_index); | |
f1042b6c | 1074 | static enum hrtimer_restart io_link_timeout_fn(struct hrtimer *timer); |
b9445598 | 1075 | |
2b188cc1 JA |
1076 | static struct kmem_cache *req_cachep; |
1077 | ||
0918682b | 1078 | static const struct file_operations io_uring_fops; |
2b188cc1 JA |
1079 | |
1080 | struct sock *io_uring_get_socket(struct file *file) | |
1081 | { | |
1082 | #if defined(CONFIG_UNIX) | |
1083 | if (file->f_op == &io_uring_fops) { | |
1084 | struct io_ring_ctx *ctx = file->private_data; | |
1085 | ||
1086 | return ctx->ring_sock->sk; | |
1087 | } | |
1088 | #endif | |
1089 | return NULL; | |
1090 | } | |
1091 | EXPORT_SYMBOL(io_uring_get_socket); | |
1092 | ||
f237c30a PB |
1093 | static inline void io_tw_lock(struct io_ring_ctx *ctx, bool *locked) |
1094 | { | |
1095 | if (!*locked) { | |
1096 | mutex_lock(&ctx->uring_lock); | |
1097 | *locked = true; | |
1098 | } | |
1099 | } | |
1100 | ||
f2f87370 PB |
1101 | #define io_for_each_link(pos, head) \ |
1102 | for (pos = (head); pos; pos = pos->link) | |
1103 | ||
21c843d5 PB |
1104 | /* |
1105 | * Shamelessly stolen from the mm implementation of page reference checking, | |
1106 | * see commit f958d7b528b1 for details. | |
1107 | */ | |
1108 | #define req_ref_zero_or_close_to_overflow(req) \ | |
1109 | ((unsigned int) atomic_read(&(req->refs)) + 127u <= 127u) | |
1110 | ||
1111 | static inline bool req_ref_inc_not_zero(struct io_kiocb *req) | |
1112 | { | |
20e60a38 | 1113 | WARN_ON_ONCE(!(req->flags & REQ_F_REFCOUNT)); |
21c843d5 PB |
1114 | return atomic_inc_not_zero(&req->refs); |
1115 | } | |
1116 | ||
21c843d5 PB |
1117 | static inline bool req_ref_put_and_test(struct io_kiocb *req) |
1118 | { | |
20e60a38 PB |
1119 | if (likely(!(req->flags & REQ_F_REFCOUNT))) |
1120 | return true; | |
1121 | ||
21c843d5 PB |
1122 | WARN_ON_ONCE(req_ref_zero_or_close_to_overflow(req)); |
1123 | return atomic_dec_and_test(&req->refs); | |
1124 | } | |
1125 | ||
1126 | static inline void req_ref_put(struct io_kiocb *req) | |
1127 | { | |
20e60a38 | 1128 | WARN_ON_ONCE(!(req->flags & REQ_F_REFCOUNT)); |
21c843d5 PB |
1129 | WARN_ON_ONCE(req_ref_put_and_test(req)); |
1130 | } | |
1131 | ||
1132 | static inline void req_ref_get(struct io_kiocb *req) | |
1133 | { | |
20e60a38 | 1134 | WARN_ON_ONCE(!(req->flags & REQ_F_REFCOUNT)); |
21c843d5 PB |
1135 | WARN_ON_ONCE(req_ref_zero_or_close_to_overflow(req)); |
1136 | atomic_inc(&req->refs); | |
1137 | } | |
1138 | ||
48dcd38d | 1139 | static inline void __io_req_set_refcount(struct io_kiocb *req, int nr) |
20e60a38 PB |
1140 | { |
1141 | if (!(req->flags & REQ_F_REFCOUNT)) { | |
1142 | req->flags |= REQ_F_REFCOUNT; | |
48dcd38d | 1143 | atomic_set(&req->refs, nr); |
20e60a38 PB |
1144 | } |
1145 | } | |
1146 | ||
48dcd38d PB |
1147 | static inline void io_req_set_refcount(struct io_kiocb *req) |
1148 | { | |
1149 | __io_req_set_refcount(req, 1); | |
1150 | } | |
1151 | ||
b895c9a6 | 1152 | static inline void io_req_set_rsrc_node(struct io_kiocb *req) |
36f72fe2 PB |
1153 | { |
1154 | struct io_ring_ctx *ctx = req->ctx; | |
1155 | ||
269bbe5f | 1156 | if (!req->fixed_rsrc_refs) { |
a7f0ed5a | 1157 | req->fixed_rsrc_refs = &ctx->rsrc_node->refs; |
269bbe5f | 1158 | percpu_ref_get(req->fixed_rsrc_refs); |
36f72fe2 PB |
1159 | } |
1160 | } | |
1161 | ||
f70865db PB |
1162 | static void io_refs_resurrect(struct percpu_ref *ref, struct completion *compl) |
1163 | { | |
1164 | bool got = percpu_ref_tryget(ref); | |
1165 | ||
1166 | /* already at zero, wait for ->release() */ | |
1167 | if (!got) | |
1168 | wait_for_completion(compl); | |
1169 | percpu_ref_resurrect(ref); | |
1170 | if (got) | |
1171 | percpu_ref_put(ref); | |
1172 | } | |
1173 | ||
3dd0c97a PB |
1174 | static bool io_match_task(struct io_kiocb *head, struct task_struct *task, |
1175 | bool cancel_all) | |
08d23634 PB |
1176 | { |
1177 | struct io_kiocb *req; | |
1178 | ||
68207680 | 1179 | if (task && head->task != task) |
08d23634 | 1180 | return false; |
3dd0c97a | 1181 | if (cancel_all) |
08d23634 PB |
1182 | return true; |
1183 | ||
1184 | io_for_each_link(req, head) { | |
b05a1bcd | 1185 | if (req->flags & REQ_F_INFLIGHT) |
02a13674 | 1186 | return true; |
08d23634 PB |
1187 | } |
1188 | return false; | |
1189 | } | |
1190 | ||
93d2bcd2 | 1191 | static inline void req_set_fail(struct io_kiocb *req) |
c40f6379 | 1192 | { |
93d2bcd2 | 1193 | req->flags |= REQ_F_FAIL; |
c40f6379 | 1194 | } |
4a38aed2 | 1195 | |
a8295b98 HX |
1196 | static inline void req_fail_link_node(struct io_kiocb *req, int res) |
1197 | { | |
1198 | req_set_fail(req); | |
1199 | req->result = res; | |
1200 | } | |
1201 | ||
2b188cc1 JA |
1202 | static void io_ring_ctx_ref_free(struct percpu_ref *ref) |
1203 | { | |
1204 | struct io_ring_ctx *ctx = container_of(ref, struct io_ring_ctx, refs); | |
1205 | ||
0f158b4c | 1206 | complete(&ctx->ref_comp); |
2b188cc1 JA |
1207 | } |
1208 | ||
8eb7e2d0 PB |
1209 | static inline bool io_is_timeout_noseq(struct io_kiocb *req) |
1210 | { | |
1211 | return !req->timeout.off; | |
1212 | } | |
1213 | ||
f56165e6 PB |
1214 | static void io_fallback_req_func(struct work_struct *work) |
1215 | { | |
1216 | struct io_ring_ctx *ctx = container_of(work, struct io_ring_ctx, | |
1217 | fallback_work.work); | |
1218 | struct llist_node *node = llist_del_all(&ctx->fallback_llist); | |
1219 | struct io_kiocb *req, *tmp; | |
f237c30a | 1220 | bool locked = false; |
f56165e6 PB |
1221 | |
1222 | percpu_ref_get(&ctx->refs); | |
1223 | llist_for_each_entry_safe(req, tmp, node, io_task_work.fallback_node) | |
f237c30a | 1224 | req->io_task_work.func(req, &locked); |
5636c00d | 1225 | |
f237c30a PB |
1226 | if (locked) { |
1227 | if (ctx->submit_state.compl_nr) | |
1228 | io_submit_flush_completions(ctx); | |
1229 | mutex_unlock(&ctx->uring_lock); | |
1230 | } | |
f56165e6 | 1231 | percpu_ref_put(&ctx->refs); |
f237c30a | 1232 | |
f56165e6 PB |
1233 | } |
1234 | ||
2b188cc1 JA |
1235 | static struct io_ring_ctx *io_ring_ctx_alloc(struct io_uring_params *p) |
1236 | { | |
1237 | struct io_ring_ctx *ctx; | |
78076bb6 | 1238 | int hash_bits; |
2b188cc1 JA |
1239 | |
1240 | ctx = kzalloc(sizeof(*ctx), GFP_KERNEL); | |
1241 | if (!ctx) | |
1242 | return NULL; | |
1243 | ||
78076bb6 JA |
1244 | /* |
1245 | * Use 5 bits less than the max cq entries, that should give us around | |
1246 | * 32 entries per hash list if totally full and uniformly spread. | |
1247 | */ | |
1248 | hash_bits = ilog2(p->cq_entries); | |
1249 | hash_bits -= 5; | |
1250 | if (hash_bits <= 0) | |
1251 | hash_bits = 1; | |
1252 | ctx->cancel_hash_bits = hash_bits; | |
1253 | ctx->cancel_hash = kmalloc((1U << hash_bits) * sizeof(struct hlist_head), | |
1254 | GFP_KERNEL); | |
1255 | if (!ctx->cancel_hash) | |
1256 | goto err; | |
1257 | __hash_init(ctx->cancel_hash, 1U << hash_bits); | |
1258 | ||
6224843d PB |
1259 | ctx->dummy_ubuf = kzalloc(sizeof(*ctx->dummy_ubuf), GFP_KERNEL); |
1260 | if (!ctx->dummy_ubuf) | |
1261 | goto err; | |
1262 | /* set invalid range, so io_import_fixed() fails meeting it */ | |
1263 | ctx->dummy_ubuf->ubuf = -1UL; | |
1264 | ||
21482896 | 1265 | if (percpu_ref_init(&ctx->refs, io_ring_ctx_ref_free, |
206aefde JA |
1266 | PERCPU_REF_ALLOW_REINIT, GFP_KERNEL)) |
1267 | goto err; | |
2b188cc1 JA |
1268 | |
1269 | ctx->flags = p->flags; | |
90554200 | 1270 | init_waitqueue_head(&ctx->sqo_sq_wait); |
69fb2131 | 1271 | INIT_LIST_HEAD(&ctx->sqd_list); |
311997b3 | 1272 | init_waitqueue_head(&ctx->poll_wait); |
1d7bb1d5 | 1273 | INIT_LIST_HEAD(&ctx->cq_overflow_list); |
0f158b4c | 1274 | init_completion(&ctx->ref_comp); |
9e15c3a0 | 1275 | xa_init_flags(&ctx->io_buffers, XA_FLAGS_ALLOC1); |
61cf9370 | 1276 | xa_init_flags(&ctx->personalities, XA_FLAGS_ALLOC1); |
2b188cc1 | 1277 | mutex_init(&ctx->uring_lock); |
311997b3 | 1278 | init_waitqueue_head(&ctx->cq_wait); |
2b188cc1 | 1279 | spin_lock_init(&ctx->completion_lock); |
89850fce | 1280 | spin_lock_init(&ctx->timeout_lock); |
540e32a0 | 1281 | INIT_LIST_HEAD(&ctx->iopoll_list); |
de0617e4 | 1282 | INIT_LIST_HEAD(&ctx->defer_list); |
5262f567 | 1283 | INIT_LIST_HEAD(&ctx->timeout_list); |
ef9dd637 | 1284 | INIT_LIST_HEAD(&ctx->ltimeout_list); |
d67d2263 BM |
1285 | spin_lock_init(&ctx->rsrc_ref_lock); |
1286 | INIT_LIST_HEAD(&ctx->rsrc_ref_list); | |
269bbe5f BM |
1287 | INIT_DELAYED_WORK(&ctx->rsrc_put_work, io_rsrc_put_work); |
1288 | init_llist_head(&ctx->rsrc_put_llist); | |
13bf43f5 | 1289 | INIT_LIST_HEAD(&ctx->tctx_list); |
cd0ca2e0 | 1290 | INIT_LIST_HEAD(&ctx->submit_state.free_list); |
d0acdee2 | 1291 | INIT_LIST_HEAD(&ctx->locked_free_list); |
9011bf9a | 1292 | INIT_DELAYED_WORK(&ctx->fallback_work, io_fallback_req_func); |
2b188cc1 | 1293 | return ctx; |
206aefde | 1294 | err: |
6224843d | 1295 | kfree(ctx->dummy_ubuf); |
78076bb6 | 1296 | kfree(ctx->cancel_hash); |
206aefde JA |
1297 | kfree(ctx); |
1298 | return NULL; | |
2b188cc1 JA |
1299 | } |
1300 | ||
8f6ed49a PB |
1301 | static void io_account_cq_overflow(struct io_ring_ctx *ctx) |
1302 | { | |
1303 | struct io_rings *r = ctx->rings; | |
1304 | ||
1305 | WRITE_ONCE(r->cq_overflow, READ_ONCE(r->cq_overflow) + 1); | |
1306 | ctx->cq_extra--; | |
1307 | } | |
1308 | ||
9cf7c104 | 1309 | static bool req_need_defer(struct io_kiocb *req, u32 seq) |
7adf4eaf | 1310 | { |
2bc9930e JA |
1311 | if (unlikely(req->flags & REQ_F_IO_DRAIN)) { |
1312 | struct io_ring_ctx *ctx = req->ctx; | |
a197f664 | 1313 | |
8f6ed49a | 1314 | return seq + READ_ONCE(ctx->cq_extra) != ctx->cached_cq_tail; |
2bc9930e | 1315 | } |
de0617e4 | 1316 | |
9d858b21 | 1317 | return false; |
de0617e4 JA |
1318 | } |
1319 | ||
c97d8a0f PB |
1320 | #define FFS_ASYNC_READ 0x1UL |
1321 | #define FFS_ASYNC_WRITE 0x2UL | |
1322 | #ifdef CONFIG_64BIT | |
1323 | #define FFS_ISREG 0x4UL | |
1324 | #else | |
1325 | #define FFS_ISREG 0x0UL | |
1326 | #endif | |
1327 | #define FFS_MASK ~(FFS_ASYNC_READ|FFS_ASYNC_WRITE|FFS_ISREG) | |
1328 | ||
1329 | static inline bool io_req_ffs_set(struct io_kiocb *req) | |
1330 | { | |
1331 | return IS_ENABLED(CONFIG_64BIT) && (req->flags & REQ_F_FIXED_FILE); | |
1332 | } | |
1333 | ||
ce3d5aae PB |
1334 | static void io_req_track_inflight(struct io_kiocb *req) |
1335 | { | |
ce3d5aae | 1336 | if (!(req->flags & REQ_F_INFLIGHT)) { |
ce3d5aae | 1337 | req->flags |= REQ_F_INFLIGHT; |
b303fe2e | 1338 | atomic_inc(¤t->io_uring->inflight_tracked); |
ce3d5aae PB |
1339 | } |
1340 | } | |
1341 | ||
906c6caa PB |
1342 | static inline void io_unprep_linked_timeout(struct io_kiocb *req) |
1343 | { | |
1344 | req->flags &= ~REQ_F_LINK_TIMEOUT; | |
1345 | } | |
1346 | ||
fd08e530 PB |
1347 | static struct io_kiocb *__io_prep_linked_timeout(struct io_kiocb *req) |
1348 | { | |
906c6caa PB |
1349 | if (WARN_ON_ONCE(!req->link)) |
1350 | return NULL; | |
1351 | ||
4d13d1a4 PB |
1352 | req->flags &= ~REQ_F_ARM_LTIMEOUT; |
1353 | req->flags |= REQ_F_LINK_TIMEOUT; | |
fd08e530 PB |
1354 | |
1355 | /* linked timeouts should have two refs once prep'ed */ | |
48dcd38d | 1356 | io_req_set_refcount(req); |
4d13d1a4 PB |
1357 | __io_req_set_refcount(req->link, 2); |
1358 | return req->link; | |
fd08e530 PB |
1359 | } |
1360 | ||
1361 | static inline struct io_kiocb *io_prep_linked_timeout(struct io_kiocb *req) | |
1362 | { | |
4d13d1a4 | 1363 | if (likely(!(req->flags & REQ_F_ARM_LTIMEOUT))) |
fd08e530 PB |
1364 | return NULL; |
1365 | return __io_prep_linked_timeout(req); | |
1366 | } | |
1367 | ||
1e6fa521 JA |
1368 | static void io_prep_async_work(struct io_kiocb *req) |
1369 | { | |
1370 | const struct io_op_def *def = &io_op_defs[req->opcode]; | |
1e6fa521 JA |
1371 | struct io_ring_ctx *ctx = req->ctx; |
1372 | ||
b8e64b53 PB |
1373 | if (!(req->flags & REQ_F_CREDS)) { |
1374 | req->flags |= REQ_F_CREDS; | |
c10d1f98 | 1375 | req->creds = get_current_cred(); |
b8e64b53 | 1376 | } |
003e8dcc | 1377 | |
e1d675df PB |
1378 | req->work.list.next = NULL; |
1379 | req->work.flags = 0; | |
feaadc4f PB |
1380 | if (req->flags & REQ_F_FORCE_ASYNC) |
1381 | req->work.flags |= IO_WQ_WORK_CONCURRENT; | |
1382 | ||
1e6fa521 JA |
1383 | if (req->flags & REQ_F_ISREG) { |
1384 | if (def->hash_reg_file || (ctx->flags & IORING_SETUP_IOPOLL)) | |
1385 | io_wq_hash_work(&req->work, file_inode(req->file)); | |
4b982bd0 | 1386 | } else if (!req->file || !S_ISBLK(file_inode(req->file)->i_mode)) { |
1e6fa521 JA |
1387 | if (def->unbound_nonreg_file) |
1388 | req->work.flags |= IO_WQ_WORK_UNBOUND; | |
1389 | } | |
e1d675df PB |
1390 | |
1391 | switch (req->opcode) { | |
1392 | case IORING_OP_SPLICE: | |
1393 | case IORING_OP_TEE: | |
e1d675df PB |
1394 | if (!S_ISREG(file_inode(req->splice.file_in)->i_mode)) |
1395 | req->work.flags |= IO_WQ_WORK_UNBOUND; | |
1396 | break; | |
1397 | } | |
561fb04a | 1398 | } |
cccf0ee8 | 1399 | |
cbdcb435 | 1400 | static void io_prep_async_link(struct io_kiocb *req) |
561fb04a | 1401 | { |
cbdcb435 | 1402 | struct io_kiocb *cur; |
54a91f3b | 1403 | |
44eff40a PB |
1404 | if (req->flags & REQ_F_LINK_TIMEOUT) { |
1405 | struct io_ring_ctx *ctx = req->ctx; | |
1406 | ||
79ebeaee | 1407 | spin_lock(&ctx->completion_lock); |
44eff40a PB |
1408 | io_for_each_link(cur, req) |
1409 | io_prep_async_work(cur); | |
79ebeaee | 1410 | spin_unlock(&ctx->completion_lock); |
44eff40a PB |
1411 | } else { |
1412 | io_for_each_link(cur, req) | |
1413 | io_prep_async_work(cur); | |
1414 | } | |
561fb04a JA |
1415 | } |
1416 | ||
f237c30a | 1417 | static void io_queue_async_work(struct io_kiocb *req, bool *locked) |
561fb04a | 1418 | { |
a197f664 | 1419 | struct io_ring_ctx *ctx = req->ctx; |
cbdcb435 | 1420 | struct io_kiocb *link = io_prep_linked_timeout(req); |
5aa75ed5 | 1421 | struct io_uring_task *tctx = req->task->io_uring; |
561fb04a | 1422 | |
f237c30a PB |
1423 | /* must not take the lock, NULL it as a precaution */ |
1424 | locked = NULL; | |
1425 | ||
3bfe6106 JA |
1426 | BUG_ON(!tctx); |
1427 | BUG_ON(!tctx->io_wq); | |
561fb04a | 1428 | |
cbdcb435 PB |
1429 | /* init ->work of the whole link before punting */ |
1430 | io_prep_async_link(req); | |
991468dc JA |
1431 | |
1432 | /* | |
1433 | * Not expected to happen, but if we do have a bug where this _can_ | |
1434 | * happen, catch it here and ensure the request is marked as | |
1435 | * canceled. That will make io-wq go through the usual work cancel | |
1436 | * procedure rather than attempt to run this request (or create a new | |
1437 | * worker for it). | |
1438 | */ | |
1439 | if (WARN_ON_ONCE(!same_thread_group(req->task, current))) | |
1440 | req->work.flags |= IO_WQ_WORK_CANCEL; | |
1441 | ||
d07f1e8a PB |
1442 | trace_io_uring_queue_async_work(ctx, io_wq_is_hashed(&req->work), req, |
1443 | &req->work, req->flags); | |
ebf93667 | 1444 | io_wq_enqueue(tctx->io_wq, &req->work); |
7271ef3a JA |
1445 | if (link) |
1446 | io_queue_linked_timeout(link); | |
cbdcb435 PB |
1447 | } |
1448 | ||
1ee4160c | 1449 | static void io_kill_timeout(struct io_kiocb *req, int status) |
8c855885 | 1450 | __must_hold(&req->ctx->completion_lock) |
89850fce | 1451 | __must_hold(&req->ctx->timeout_lock) |
5262f567 | 1452 | { |
e8c2bc1f | 1453 | struct io_timeout_data *io = req->async_data; |
5262f567 | 1454 | |
fd9c7bc5 | 1455 | if (hrtimer_try_to_cancel(&io->timer) != -1) { |
01cec8c1 PB |
1456 | atomic_set(&req->ctx->cq_timeouts, |
1457 | atomic_read(&req->ctx->cq_timeouts) + 1); | |
135fcde8 | 1458 | list_del_init(&req->timeout.list); |
d4d19c19 | 1459 | io_cqring_fill_event(req->ctx, req->user_data, status, 0); |
91c2f697 | 1460 | io_put_req_deferred(req); |
5262f567 JA |
1461 | } |
1462 | } | |
1463 | ||
441b8a78 | 1464 | static void io_queue_deferred(struct io_ring_ctx *ctx) |
de0617e4 | 1465 | { |
441b8a78 | 1466 | while (!list_empty(&ctx->defer_list)) { |
27dc8338 PB |
1467 | struct io_defer_entry *de = list_first_entry(&ctx->defer_list, |
1468 | struct io_defer_entry, list); | |
de0617e4 | 1469 | |
9cf7c104 | 1470 | if (req_need_defer(de->req, de->seq)) |
04518945 | 1471 | break; |
27dc8338 | 1472 | list_del_init(&de->list); |
907d1df3 | 1473 | io_req_task_queue(de->req); |
27dc8338 | 1474 | kfree(de); |
441b8a78 | 1475 | } |
04518945 PB |
1476 | } |
1477 | ||
360428f8 | 1478 | static void io_flush_timeouts(struct io_ring_ctx *ctx) |
89850fce | 1479 | __must_hold(&ctx->completion_lock) |
de0617e4 | 1480 | { |
441b8a78 | 1481 | u32 seq = ctx->cached_cq_tail - atomic_read(&ctx->cq_timeouts); |
f010505b | 1482 | |
79ebeaee | 1483 | spin_lock_irq(&ctx->timeout_lock); |
f18ee4cf | 1484 | while (!list_empty(&ctx->timeout_list)) { |
f010505b | 1485 | u32 events_needed, events_got; |
360428f8 | 1486 | struct io_kiocb *req = list_first_entry(&ctx->timeout_list, |
135fcde8 | 1487 | struct io_kiocb, timeout.list); |
de0617e4 | 1488 | |
8eb7e2d0 | 1489 | if (io_is_timeout_noseq(req)) |
360428f8 | 1490 | break; |
f010505b MDG |
1491 | |
1492 | /* | |
1493 | * Since seq can easily wrap around over time, subtract | |
1494 | * the last seq at which timeouts were flushed before comparing. | |
1495 | * Assuming not more than 2^31-1 events have happened since, | |
1496 | * these subtractions won't have wrapped, so we can check if | |
1497 | * target is in [last_seq, current_seq] by comparing the two. | |
1498 | */ | |
1499 | events_needed = req->timeout.target_seq - ctx->cq_last_tm_flush; | |
1500 | events_got = seq - ctx->cq_last_tm_flush; | |
1501 | if (events_got < events_needed) | |
360428f8 | 1502 | break; |
bfe68a22 | 1503 | |
135fcde8 | 1504 | list_del_init(&req->timeout.list); |
1ee4160c | 1505 | io_kill_timeout(req, 0); |
f18ee4cf | 1506 | } |
f010505b | 1507 | ctx->cq_last_tm_flush = seq; |
79ebeaee | 1508 | spin_unlock_irq(&ctx->timeout_lock); |
360428f8 | 1509 | } |
5262f567 | 1510 | |
2335f6f5 | 1511 | static void __io_commit_cqring_flush(struct io_ring_ctx *ctx) |
360428f8 | 1512 | { |
2335f6f5 PB |
1513 | if (ctx->off_timeout_used) |
1514 | io_flush_timeouts(ctx); | |
1515 | if (ctx->drain_active) | |
1516 | io_queue_deferred(ctx); | |
1517 | } | |
1518 | ||
1519 | static inline void io_commit_cqring(struct io_ring_ctx *ctx) | |
1520 | { | |
1521 | if (unlikely(ctx->off_timeout_used || ctx->drain_active)) | |
1522 | __io_commit_cqring_flush(ctx); | |
ec30e04b PB |
1523 | /* order cqe stores with ring update */ |
1524 | smp_store_release(&ctx->rings->cq.tail, ctx->cached_cq_tail); | |
de0617e4 JA |
1525 | } |
1526 | ||
90554200 JA |
1527 | static inline bool io_sqring_full(struct io_ring_ctx *ctx) |
1528 | { | |
1529 | struct io_rings *r = ctx->rings; | |
1530 | ||
a566c556 | 1531 | return READ_ONCE(r->sq.tail) - ctx->cached_sq_head == ctx->sq_entries; |
90554200 JA |
1532 | } |
1533 | ||
888aae2e PB |
1534 | static inline unsigned int __io_cqring_events(struct io_ring_ctx *ctx) |
1535 | { | |
1536 | return ctx->cached_cq_tail - READ_ONCE(ctx->rings->cq.head); | |
1537 | } | |
1538 | ||
d068b506 | 1539 | static inline struct io_uring_cqe *io_get_cqe(struct io_ring_ctx *ctx) |
2b188cc1 | 1540 | { |
75b28aff | 1541 | struct io_rings *rings = ctx->rings; |
ea5ab3b5 | 1542 | unsigned tail, mask = ctx->cq_entries - 1; |
2b188cc1 | 1543 | |
115e12e5 SB |
1544 | /* |
1545 | * writes to the cq entry need to come after reading head; the | |
1546 | * control dependency is enough as we're using WRITE_ONCE to | |
1547 | * fill the cq entry | |
1548 | */ | |
a566c556 | 1549 | if (__io_cqring_events(ctx) == ctx->cq_entries) |
2b188cc1 JA |
1550 | return NULL; |
1551 | ||
888aae2e | 1552 | tail = ctx->cached_cq_tail++; |
ea5ab3b5 | 1553 | return &rings->cqes[tail & mask]; |
2b188cc1 JA |
1554 | } |
1555 | ||
f2842ab5 JA |
1556 | static inline bool io_should_trigger_evfd(struct io_ring_ctx *ctx) |
1557 | { | |
44c769de | 1558 | if (likely(!ctx->cq_ev_fd)) |
f0b493e6 | 1559 | return false; |
7e55a19c SG |
1560 | if (READ_ONCE(ctx->rings->cq_flags) & IORING_CQ_EVENTFD_DISABLED) |
1561 | return false; | |
44c769de | 1562 | return !ctx->eventfd_async || io_wq_current_is_worker(); |
f2842ab5 JA |
1563 | } |
1564 | ||
2c5d763c JA |
1565 | /* |
1566 | * This should only get called when at least one event has been posted. | |
1567 | * Some applications rely on the eventfd notification count only changing | |
1568 | * IFF a new CQE has been added to the CQ ring. There's no depedency on | |
1569 | * 1:1 relationship between how many times this function is called (and | |
1570 | * hence the eventfd count) and number of CQEs posted to the CQ ring. | |
1571 | */ | |
b41e9852 | 1572 | static void io_cqring_ev_posted(struct io_ring_ctx *ctx) |
1d7bb1d5 | 1573 | { |
5fd46178 JA |
1574 | /* |
1575 | * wake_up_all() may seem excessive, but io_wake_function() and | |
1576 | * io_should_wake() handle the termination of the loop and only | |
1577 | * wake as many waiters as we need to. | |
1578 | */ | |
1579 | if (wq_has_sleeper(&ctx->cq_wait)) | |
1580 | wake_up_all(&ctx->cq_wait); | |
534ca6d6 JA |
1581 | if (ctx->sq_data && waitqueue_active(&ctx->sq_data->wait)) |
1582 | wake_up(&ctx->sq_data->wait); | |
b41e9852 | 1583 | if (io_should_trigger_evfd(ctx)) |
1d7bb1d5 | 1584 | eventfd_signal(ctx->cq_ev_fd, 1); |
311997b3 PB |
1585 | if (waitqueue_active(&ctx->poll_wait)) { |
1586 | wake_up_interruptible(&ctx->poll_wait); | |
4aa84f2f PB |
1587 | kill_fasync(&ctx->cq_fasync, SIGIO, POLL_IN); |
1588 | } | |
1d7bb1d5 JA |
1589 | } |
1590 | ||
80c18e4a PB |
1591 | static void io_cqring_ev_posted_iopoll(struct io_ring_ctx *ctx) |
1592 | { | |
1593 | if (ctx->flags & IORING_SETUP_SQPOLL) { | |
5fd46178 JA |
1594 | if (wq_has_sleeper(&ctx->cq_wait)) |
1595 | wake_up_all(&ctx->cq_wait); | |
80c18e4a PB |
1596 | } |
1597 | if (io_should_trigger_evfd(ctx)) | |
1598 | eventfd_signal(ctx->cq_ev_fd, 1); | |
311997b3 PB |
1599 | if (waitqueue_active(&ctx->poll_wait)) { |
1600 | wake_up_interruptible(&ctx->poll_wait); | |
4aa84f2f PB |
1601 | kill_fasync(&ctx->cq_fasync, SIGIO, POLL_IN); |
1602 | } | |
80c18e4a PB |
1603 | } |
1604 | ||
c4a2ed72 | 1605 | /* Returns true if there are no backlogged entries after the flush */ |
6c2450ae | 1606 | static bool __io_cqring_overflow_flush(struct io_ring_ctx *ctx, bool force) |
1d7bb1d5 | 1607 | { |
b18032bb | 1608 | bool all_flushed, posted; |
1d7bb1d5 | 1609 | |
a566c556 | 1610 | if (!force && __io_cqring_events(ctx) == ctx->cq_entries) |
e23de15f | 1611 | return false; |
1d7bb1d5 | 1612 | |
b18032bb | 1613 | posted = false; |
79ebeaee | 1614 | spin_lock(&ctx->completion_lock); |
6c2450ae | 1615 | while (!list_empty(&ctx->cq_overflow_list)) { |
d068b506 | 1616 | struct io_uring_cqe *cqe = io_get_cqe(ctx); |
6c2450ae | 1617 | struct io_overflow_cqe *ocqe; |
e6c8aa9a | 1618 | |
1d7bb1d5 JA |
1619 | if (!cqe && !force) |
1620 | break; | |
6c2450ae PB |
1621 | ocqe = list_first_entry(&ctx->cq_overflow_list, |
1622 | struct io_overflow_cqe, list); | |
1623 | if (cqe) | |
1624 | memcpy(cqe, &ocqe->cqe, sizeof(*cqe)); | |
1625 | else | |
8f6ed49a PB |
1626 | io_account_cq_overflow(ctx); |
1627 | ||
b18032bb | 1628 | posted = true; |
6c2450ae PB |
1629 | list_del(&ocqe->list); |
1630 | kfree(ocqe); | |
1d7bb1d5 JA |
1631 | } |
1632 | ||
09e88404 PB |
1633 | all_flushed = list_empty(&ctx->cq_overflow_list); |
1634 | if (all_flushed) { | |
5ed7a37d | 1635 | clear_bit(0, &ctx->check_cq_overflow); |
20c0b380 NA |
1636 | WRITE_ONCE(ctx->rings->sq_flags, |
1637 | ctx->rings->sq_flags & ~IORING_SQ_CQ_OVERFLOW); | |
09e88404 | 1638 | } |
46930143 | 1639 | |
b18032bb JA |
1640 | if (posted) |
1641 | io_commit_cqring(ctx); | |
79ebeaee | 1642 | spin_unlock(&ctx->completion_lock); |
b18032bb JA |
1643 | if (posted) |
1644 | io_cqring_ev_posted(ctx); | |
09e88404 | 1645 | return all_flushed; |
1d7bb1d5 JA |
1646 | } |
1647 | ||
90f67366 | 1648 | static bool io_cqring_overflow_flush(struct io_ring_ctx *ctx) |
6c503150 | 1649 | { |
ca0a2651 JA |
1650 | bool ret = true; |
1651 | ||
5ed7a37d | 1652 | if (test_bit(0, &ctx->check_cq_overflow)) { |
6c503150 PB |
1653 | /* iopoll syncs against uring_lock, not completion_lock */ |
1654 | if (ctx->flags & IORING_SETUP_IOPOLL) | |
1655 | mutex_lock(&ctx->uring_lock); | |
90f67366 | 1656 | ret = __io_cqring_overflow_flush(ctx, false); |
6c503150 PB |
1657 | if (ctx->flags & IORING_SETUP_IOPOLL) |
1658 | mutex_unlock(&ctx->uring_lock); | |
1659 | } | |
ca0a2651 JA |
1660 | |
1661 | return ret; | |
6c503150 PB |
1662 | } |
1663 | ||
6a290a14 PB |
1664 | /* must to be called somewhat shortly after putting a request */ |
1665 | static inline void io_put_task(struct task_struct *task, int nr) | |
1666 | { | |
1667 | struct io_uring_task *tctx = task->io_uring; | |
1668 | ||
e98e49b2 PB |
1669 | if (likely(task == current)) { |
1670 | tctx->cached_refs += nr; | |
1671 | } else { | |
1672 | percpu_counter_sub(&tctx->inflight, nr); | |
1673 | if (unlikely(atomic_read(&tctx->in_idle))) | |
1674 | wake_up(&tctx->wait); | |
1675 | put_task_struct_many(task, nr); | |
1676 | } | |
6a290a14 PB |
1677 | } |
1678 | ||
9a10867a PB |
1679 | static void io_task_refs_refill(struct io_uring_task *tctx) |
1680 | { | |
1681 | unsigned int refill = -tctx->cached_refs + IO_TCTX_REFS_CACHE_NR; | |
1682 | ||
1683 | percpu_counter_add(&tctx->inflight, refill); | |
1684 | refcount_add(refill, ¤t->usage); | |
1685 | tctx->cached_refs += refill; | |
1686 | } | |
1687 | ||
1688 | static inline void io_get_task_refs(int nr) | |
1689 | { | |
1690 | struct io_uring_task *tctx = current->io_uring; | |
1691 | ||
1692 | tctx->cached_refs -= nr; | |
1693 | if (unlikely(tctx->cached_refs < 0)) | |
1694 | io_task_refs_refill(tctx); | |
1695 | } | |
1696 | ||
d4d19c19 PB |
1697 | static bool io_cqring_event_overflow(struct io_ring_ctx *ctx, u64 user_data, |
1698 | long res, unsigned int cflags) | |
2b188cc1 | 1699 | { |
cce4b8b0 | 1700 | struct io_overflow_cqe *ocqe; |
2b188cc1 | 1701 | |
cce4b8b0 PB |
1702 | ocqe = kmalloc(sizeof(*ocqe), GFP_ATOMIC | __GFP_ACCOUNT); |
1703 | if (!ocqe) { | |
1704 | /* | |
1705 | * If we're in ring overflow flush mode, or in task cancel mode, | |
1706 | * or cannot allocate an overflow entry, then we need to drop it | |
1707 | * on the floor. | |
1708 | */ | |
8f6ed49a | 1709 | io_account_cq_overflow(ctx); |
cce4b8b0 | 1710 | return false; |
2b188cc1 | 1711 | } |
cce4b8b0 | 1712 | if (list_empty(&ctx->cq_overflow_list)) { |
5ed7a37d | 1713 | set_bit(0, &ctx->check_cq_overflow); |
20c0b380 NA |
1714 | WRITE_ONCE(ctx->rings->sq_flags, |
1715 | ctx->rings->sq_flags | IORING_SQ_CQ_OVERFLOW); | |
1716 | ||
cce4b8b0 | 1717 | } |
d4d19c19 | 1718 | ocqe->cqe.user_data = user_data; |
cce4b8b0 PB |
1719 | ocqe->cqe.res = res; |
1720 | ocqe->cqe.flags = cflags; | |
1721 | list_add_tail(&ocqe->list, &ctx->cq_overflow_list); | |
1722 | return true; | |
2b188cc1 JA |
1723 | } |
1724 | ||
d4d19c19 PB |
1725 | static inline bool __io_cqring_fill_event(struct io_ring_ctx *ctx, u64 user_data, |
1726 | long res, unsigned int cflags) | |
2b188cc1 JA |
1727 | { |
1728 | struct io_uring_cqe *cqe; | |
1729 | ||
d4d19c19 | 1730 | trace_io_uring_complete(ctx, user_data, res, cflags); |
51c3ff62 | 1731 | |
2b188cc1 JA |
1732 | /* |
1733 | * If we can't get a cq entry, userspace overflowed the | |
1734 | * submission (by quite a lot). Increment the overflow count in | |
1735 | * the ring. | |
1736 | */ | |
d068b506 | 1737 | cqe = io_get_cqe(ctx); |
1d7bb1d5 | 1738 | if (likely(cqe)) { |
d4d19c19 | 1739 | WRITE_ONCE(cqe->user_data, user_data); |
2b188cc1 | 1740 | WRITE_ONCE(cqe->res, res); |
bcda7baa | 1741 | WRITE_ONCE(cqe->flags, cflags); |
8d13326e | 1742 | return true; |
2b188cc1 | 1743 | } |
d4d19c19 | 1744 | return io_cqring_event_overflow(ctx, user_data, res, cflags); |
2b188cc1 JA |
1745 | } |
1746 | ||
8d13326e | 1747 | /* not as hot to bloat with inlining */ |
d4d19c19 PB |
1748 | static noinline bool io_cqring_fill_event(struct io_ring_ctx *ctx, u64 user_data, |
1749 | long res, unsigned int cflags) | |
bcda7baa | 1750 | { |
d4d19c19 | 1751 | return __io_cqring_fill_event(ctx, user_data, res, cflags); |
bcda7baa JA |
1752 | } |
1753 | ||
7a612350 PB |
1754 | static void io_req_complete_post(struct io_kiocb *req, long res, |
1755 | unsigned int cflags) | |
2b188cc1 | 1756 | { |
78e19bbe | 1757 | struct io_ring_ctx *ctx = req->ctx; |
2b188cc1 | 1758 | |
79ebeaee | 1759 | spin_lock(&ctx->completion_lock); |
d4d19c19 | 1760 | __io_cqring_fill_event(ctx, req->user_data, res, cflags); |
c7dae4ba JA |
1761 | /* |
1762 | * If we're the last reference to this request, add to our locked | |
1763 | * free_list cache. | |
1764 | */ | |
de9b4cca | 1765 | if (req_ref_put_and_test(req)) { |
7a612350 | 1766 | if (req->flags & (REQ_F_LINK | REQ_F_HARDLINK)) { |
0756a869 | 1767 | if (req->flags & IO_DISARM_MASK) |
7a612350 PB |
1768 | io_disarm_next(req); |
1769 | if (req->link) { | |
1770 | io_req_task_queue(req->link); | |
1771 | req->link = NULL; | |
1772 | } | |
1773 | } | |
c7dae4ba JA |
1774 | io_dismantle_req(req); |
1775 | io_put_task(req->task, 1); | |
bb943b82 | 1776 | list_add(&req->inflight_entry, &ctx->locked_free_list); |
d0acdee2 | 1777 | ctx->locked_free_nr++; |
180f829f PB |
1778 | } else { |
1779 | if (!percpu_ref_tryget(&ctx->refs)) | |
1780 | req = NULL; | |
1781 | } | |
7a612350 | 1782 | io_commit_cqring(ctx); |
79ebeaee | 1783 | spin_unlock(&ctx->completion_lock); |
7a612350 | 1784 | |
180f829f PB |
1785 | if (req) { |
1786 | io_cqring_ev_posted(ctx); | |
c7dae4ba | 1787 | percpu_ref_put(&ctx->refs); |
180f829f | 1788 | } |
229a7b63 JA |
1789 | } |
1790 | ||
4e3d9ff9 JA |
1791 | static inline bool io_req_needs_clean(struct io_kiocb *req) |
1792 | { | |
c854357b | 1793 | return req->flags & IO_REQ_CLEAN_FLAGS; |
4e3d9ff9 JA |
1794 | } |
1795 | ||
a38d68db | 1796 | static void io_req_complete_state(struct io_kiocb *req, long res, |
889fca73 | 1797 | unsigned int cflags) |
229a7b63 | 1798 | { |
4e3d9ff9 | 1799 | if (io_req_needs_clean(req)) |
68fb8979 | 1800 | io_clean_op(req); |
a38d68db PB |
1801 | req->result = res; |
1802 | req->compl.cflags = cflags; | |
e342c807 | 1803 | req->flags |= REQ_F_COMPLETE_INLINE; |
e1e16097 JA |
1804 | } |
1805 | ||
889fca73 PB |
1806 | static inline void __io_req_complete(struct io_kiocb *req, unsigned issue_flags, |
1807 | long res, unsigned cflags) | |
bcda7baa | 1808 | { |
889fca73 PB |
1809 | if (issue_flags & IO_URING_F_COMPLETE_DEFER) |
1810 | io_req_complete_state(req, res, cflags); | |
a38d68db | 1811 | else |
c7dae4ba | 1812 | io_req_complete_post(req, res, cflags); |
bcda7baa JA |
1813 | } |
1814 | ||
a38d68db | 1815 | static inline void io_req_complete(struct io_kiocb *req, long res) |
0ddf92e8 | 1816 | { |
889fca73 | 1817 | __io_req_complete(req, 0, res, 0); |
0ddf92e8 JA |
1818 | } |
1819 | ||
f41db273 PB |
1820 | static void io_req_complete_failed(struct io_kiocb *req, long res) |
1821 | { | |
93d2bcd2 | 1822 | req_set_fail(req); |
f41db273 PB |
1823 | io_req_complete_post(req, res, 0); |
1824 | } | |
1825 | ||
c6d3d9cb PB |
1826 | static void io_req_complete_fail_submit(struct io_kiocb *req) |
1827 | { | |
1828 | /* | |
1829 | * We don't submit, fail them all, for that replace hardlinks with | |
1830 | * normal links. Extra REQ_F_LINK is tolerated. | |
1831 | */ | |
1832 | req->flags &= ~REQ_F_HARDLINK; | |
1833 | req->flags |= REQ_F_LINK; | |
1834 | io_req_complete_failed(req, req->result); | |
1835 | } | |
1836 | ||
864ea921 PB |
1837 | /* |
1838 | * Don't initialise the fields below on every allocation, but do that in | |
1839 | * advance and keep them valid across allocations. | |
1840 | */ | |
1841 | static void io_preinit_req(struct io_kiocb *req, struct io_ring_ctx *ctx) | |
1842 | { | |
1843 | req->ctx = ctx; | |
1844 | req->link = NULL; | |
1845 | req->async_data = NULL; | |
1846 | /* not necessary, but safer to zero */ | |
1847 | req->result = 0; | |
1848 | } | |
1849 | ||
dac7a098 | 1850 | static void io_flush_cached_locked_reqs(struct io_ring_ctx *ctx, |
cd0ca2e0 | 1851 | struct io_submit_state *state) |
dac7a098 | 1852 | { |
79ebeaee | 1853 | spin_lock(&ctx->completion_lock); |
cd0ca2e0 | 1854 | list_splice_init(&ctx->locked_free_list, &state->free_list); |
d0acdee2 | 1855 | ctx->locked_free_nr = 0; |
79ebeaee | 1856 | spin_unlock(&ctx->completion_lock); |
dac7a098 PB |
1857 | } |
1858 | ||
dd78f492 | 1859 | /* Returns true IFF there are requests in the cache */ |
c7dae4ba | 1860 | static bool io_flush_cached_reqs(struct io_ring_ctx *ctx) |
0ddf92e8 | 1861 | { |
c7dae4ba | 1862 | struct io_submit_state *state = &ctx->submit_state; |
dd78f492 | 1863 | int nr; |
0ddf92e8 | 1864 | |
c7dae4ba JA |
1865 | /* |
1866 | * If we have more than a batch's worth of requests in our IRQ side | |
1867 | * locked cache, grab the lock and move them over to our submission | |
1868 | * side cache. | |
1869 | */ | |
d0acdee2 | 1870 | if (READ_ONCE(ctx->locked_free_nr) > IO_COMPL_BATCH) |
cd0ca2e0 | 1871 | io_flush_cached_locked_reqs(ctx, state); |
0ddf92e8 | 1872 | |
dd78f492 | 1873 | nr = state->free_reqs; |
cd0ca2e0 PB |
1874 | while (!list_empty(&state->free_list)) { |
1875 | struct io_kiocb *req = list_first_entry(&state->free_list, | |
bb943b82 | 1876 | struct io_kiocb, inflight_entry); |
dd78f492 | 1877 | |
bb943b82 | 1878 | list_del(&req->inflight_entry); |
dd78f492 PB |
1879 | state->reqs[nr++] = req; |
1880 | if (nr == ARRAY_SIZE(state->reqs)) | |
e5d1bc0a | 1881 | break; |
1b4c351f JA |
1882 | } |
1883 | ||
dd78f492 PB |
1884 | state->free_reqs = nr; |
1885 | return nr != 0; | |
0ddf92e8 JA |
1886 | } |
1887 | ||
5d5901a3 PB |
1888 | /* |
1889 | * A request might get retired back into the request caches even before opcode | |
1890 | * handlers and io_issue_sqe() are done with it, e.g. inline completion path. | |
1891 | * Because of that, io_alloc_req() should be called only under ->uring_lock | |
1892 | * and with extra caution to not get a request that is still worked on. | |
1893 | */ | |
e5d1bc0a | 1894 | static struct io_kiocb *io_alloc_req(struct io_ring_ctx *ctx) |
5d5901a3 | 1895 | __must_hold(&ctx->uring_lock) |
2b188cc1 | 1896 | { |
e5d1bc0a | 1897 | struct io_submit_state *state = &ctx->submit_state; |
864ea921 PB |
1898 | gfp_t gfp = GFP_KERNEL | __GFP_NOWARN; |
1899 | int ret, i; | |
e5d1bc0a | 1900 | |
fe7e3257 | 1901 | BUILD_BUG_ON(ARRAY_SIZE(state->reqs) < IO_REQ_ALLOC_BATCH); |
e5d1bc0a | 1902 | |
864ea921 PB |
1903 | if (likely(state->free_reqs || io_flush_cached_reqs(ctx))) |
1904 | goto got_req; | |
e5d1bc0a | 1905 | |
864ea921 PB |
1906 | ret = kmem_cache_alloc_bulk(req_cachep, gfp, IO_REQ_ALLOC_BATCH, |
1907 | state->reqs); | |
fd6fab2c | 1908 | |
864ea921 PB |
1909 | /* |
1910 | * Bulk alloc is all-or-nothing. If we fail to get a batch, | |
1911 | * retry single alloc to be on the safe side. | |
1912 | */ | |
1913 | if (unlikely(ret <= 0)) { | |
1914 | state->reqs[0] = kmem_cache_alloc(req_cachep, gfp); | |
1915 | if (!state->reqs[0]) | |
1916 | return NULL; | |
1917 | ret = 1; | |
2b188cc1 | 1918 | } |
864ea921 PB |
1919 | |
1920 | for (i = 0; i < ret; i++) | |
1921 | io_preinit_req(state->reqs[i], ctx); | |
1922 | state->free_reqs = ret; | |
e5d1bc0a | 1923 | got_req: |
291b2821 PB |
1924 | state->free_reqs--; |
1925 | return state->reqs[state->free_reqs]; | |
2b188cc1 JA |
1926 | } |
1927 | ||
e1d767f0 | 1928 | static inline void io_put_file(struct file *file) |
8da11c19 | 1929 | { |
e1d767f0 | 1930 | if (file) |
8da11c19 PB |
1931 | fput(file); |
1932 | } | |
1933 | ||
4edf20f9 | 1934 | static void io_dismantle_req(struct io_kiocb *req) |
2b188cc1 | 1935 | { |
094bae49 | 1936 | unsigned int flags = req->flags; |
929a3af9 | 1937 | |
3a0a6902 PB |
1938 | if (io_req_needs_clean(req)) |
1939 | io_clean_op(req); | |
e1d767f0 PB |
1940 | if (!(flags & REQ_F_FIXED_FILE)) |
1941 | io_put_file(req->file); | |
269bbe5f BM |
1942 | if (req->fixed_rsrc_refs) |
1943 | percpu_ref_put(req->fixed_rsrc_refs); | |
99ebe4ef | 1944 | if (req->async_data) { |
094bae49 | 1945 | kfree(req->async_data); |
99ebe4ef PB |
1946 | req->async_data = NULL; |
1947 | } | |
e65ef56d JA |
1948 | } |
1949 | ||
216578e5 | 1950 | static void __io_free_req(struct io_kiocb *req) |
c6ca97b3 | 1951 | { |
51a4cc11 | 1952 | struct io_ring_ctx *ctx = req->ctx; |
c6ca97b3 | 1953 | |
216578e5 | 1954 | io_dismantle_req(req); |
7c660731 | 1955 | io_put_task(req->task, 1); |
c6ca97b3 | 1956 | |
79ebeaee | 1957 | spin_lock(&ctx->completion_lock); |
bb943b82 | 1958 | list_add(&req->inflight_entry, &ctx->locked_free_list); |
c34b025f | 1959 | ctx->locked_free_nr++; |
79ebeaee | 1960 | spin_unlock(&ctx->completion_lock); |
c34b025f | 1961 | |
ecfc5177 | 1962 | percpu_ref_put(&ctx->refs); |
e65ef56d JA |
1963 | } |
1964 | ||
f2f87370 PB |
1965 | static inline void io_remove_next_linked(struct io_kiocb *req) |
1966 | { | |
1967 | struct io_kiocb *nxt = req->link; | |
1968 | ||
1969 | req->link = nxt->link; | |
1970 | nxt->link = NULL; | |
1971 | } | |
1972 | ||
33cc89a9 PB |
1973 | static bool io_kill_linked_timeout(struct io_kiocb *req) |
1974 | __must_hold(&req->ctx->completion_lock) | |
89b263f6 | 1975 | __must_hold(&req->ctx->timeout_lock) |
2665abfd | 1976 | { |
33cc89a9 | 1977 | struct io_kiocb *link = req->link; |
f2f87370 | 1978 | |
b97e736a | 1979 | if (link && link->opcode == IORING_OP_LINK_TIMEOUT) { |
c9abd7ad | 1980 | struct io_timeout_data *io = link->async_data; |
7c86ffee | 1981 | |
f2f87370 | 1982 | io_remove_next_linked(req); |
90cd7e42 | 1983 | link->timeout.head = NULL; |
fd9c7bc5 | 1984 | if (hrtimer_try_to_cancel(&io->timer) != -1) { |
ef9dd637 | 1985 | list_del(&link->timeout.list); |
d4d19c19 PB |
1986 | io_cqring_fill_event(link->ctx, link->user_data, |
1987 | -ECANCELED, 0); | |
91c2f697 | 1988 | io_put_req_deferred(link); |
d4729fbd | 1989 | return true; |
c9abd7ad PB |
1990 | } |
1991 | } | |
d4729fbd | 1992 | return false; |
7c86ffee PB |
1993 | } |
1994 | ||
d148ca4b | 1995 | static void io_fail_links(struct io_kiocb *req) |
33cc89a9 | 1996 | __must_hold(&req->ctx->completion_lock) |
9e645e11 | 1997 | { |
33cc89a9 | 1998 | struct io_kiocb *nxt, *link = req->link; |
9e645e11 | 1999 | |
f2f87370 | 2000 | req->link = NULL; |
f2f87370 | 2001 | while (link) { |
a8295b98 HX |
2002 | long res = -ECANCELED; |
2003 | ||
2004 | if (link->flags & REQ_F_FAIL) | |
2005 | res = link->result; | |
2006 | ||
f2f87370 PB |
2007 | nxt = link->link; |
2008 | link->link = NULL; | |
2665abfd | 2009 | |
f2f87370 | 2010 | trace_io_uring_fail_link(req, link); |
a8295b98 | 2011 | io_cqring_fill_event(link->ctx, link->user_data, res, 0); |
91c2f697 | 2012 | io_put_req_deferred(link); |
f2f87370 | 2013 | link = nxt; |
9e645e11 | 2014 | } |
33cc89a9 | 2015 | } |
9e645e11 | 2016 | |
33cc89a9 PB |
2017 | static bool io_disarm_next(struct io_kiocb *req) |
2018 | __must_hold(&req->ctx->completion_lock) | |
2019 | { | |
2020 | bool posted = false; | |
2021 | ||
0756a869 PB |
2022 | if (req->flags & REQ_F_ARM_LTIMEOUT) { |
2023 | struct io_kiocb *link = req->link; | |
2024 | ||
906c6caa | 2025 | req->flags &= ~REQ_F_ARM_LTIMEOUT; |
0756a869 PB |
2026 | if (link && link->opcode == IORING_OP_LINK_TIMEOUT) { |
2027 | io_remove_next_linked(req); | |
2028 | io_cqring_fill_event(link->ctx, link->user_data, | |
2029 | -ECANCELED, 0); | |
2030 | io_put_req_deferred(link); | |
2031 | posted = true; | |
2032 | } | |
2033 | } else if (req->flags & REQ_F_LINK_TIMEOUT) { | |
89b263f6 JA |
2034 | struct io_ring_ctx *ctx = req->ctx; |
2035 | ||
2036 | spin_lock_irq(&ctx->timeout_lock); | |
33cc89a9 | 2037 | posted = io_kill_linked_timeout(req); |
89b263f6 JA |
2038 | spin_unlock_irq(&ctx->timeout_lock); |
2039 | } | |
93d2bcd2 | 2040 | if (unlikely((req->flags & REQ_F_FAIL) && |
e4335ed3 | 2041 | !(req->flags & REQ_F_HARDLINK))) { |
33cc89a9 PB |
2042 | posted |= (req->link != NULL); |
2043 | io_fail_links(req); | |
2044 | } | |
2045 | return posted; | |
9e645e11 JA |
2046 | } |
2047 | ||
3fa5e0f3 | 2048 | static struct io_kiocb *__io_req_find_next(struct io_kiocb *req) |
c69f8dbe | 2049 | { |
33cc89a9 | 2050 | struct io_kiocb *nxt; |
944e58bf | 2051 | |
9e645e11 JA |
2052 | /* |
2053 | * If LINK is set, we have dependent requests in this chain. If we | |
2054 | * didn't fail this request, queue the first one up, moving any other | |
2055 | * dependencies to the next request. In case of failure, fail the rest | |
2056 | * of the chain. | |
2057 | */ | |
0756a869 | 2058 | if (req->flags & IO_DISARM_MASK) { |
33cc89a9 | 2059 | struct io_ring_ctx *ctx = req->ctx; |
33cc89a9 PB |
2060 | bool posted; |
2061 | ||
79ebeaee | 2062 | spin_lock(&ctx->completion_lock); |
33cc89a9 PB |
2063 | posted = io_disarm_next(req); |
2064 | if (posted) | |
2065 | io_commit_cqring(req->ctx); | |
79ebeaee | 2066 | spin_unlock(&ctx->completion_lock); |
33cc89a9 PB |
2067 | if (posted) |
2068 | io_cqring_ev_posted(ctx); | |
f2f87370 | 2069 | } |
33cc89a9 PB |
2070 | nxt = req->link; |
2071 | req->link = NULL; | |
2072 | return nxt; | |
4d7dd462 | 2073 | } |
9e645e11 | 2074 | |
f2f87370 | 2075 | static inline struct io_kiocb *io_req_find_next(struct io_kiocb *req) |
3fa5e0f3 | 2076 | { |
cdbff982 | 2077 | if (likely(!(req->flags & (REQ_F_LINK|REQ_F_HARDLINK)))) |
3fa5e0f3 PB |
2078 | return NULL; |
2079 | return __io_req_find_next(req); | |
2080 | } | |
2081 | ||
f237c30a | 2082 | static void ctx_flush_and_put(struct io_ring_ctx *ctx, bool *locked) |
2c32395d PB |
2083 | { |
2084 | if (!ctx) | |
2085 | return; | |
f237c30a | 2086 | if (*locked) { |
99c8bc52 HX |
2087 | if (ctx->submit_state.compl_nr) |
2088 | io_submit_flush_completions(ctx); | |
2c32395d | 2089 | mutex_unlock(&ctx->uring_lock); |
f237c30a | 2090 | *locked = false; |
2c32395d PB |
2091 | } |
2092 | percpu_ref_put(&ctx->refs); | |
2093 | } | |
2094 | ||
7cbf1722 | 2095 | static void tctx_task_work(struct callback_head *cb) |
c40f6379 | 2096 | { |
f237c30a | 2097 | bool locked = false; |
ebd0df2e | 2098 | struct io_ring_ctx *ctx = NULL; |
3f18407d PB |
2099 | struct io_uring_task *tctx = container_of(cb, struct io_uring_task, |
2100 | task_work); | |
c40f6379 | 2101 | |
16f72070 | 2102 | while (1) { |
3f18407d PB |
2103 | struct io_wq_work_node *node; |
2104 | ||
2105 | spin_lock_irq(&tctx->task_lock); | |
c6538be9 | 2106 | node = tctx->task_list.first; |
3f18407d | 2107 | INIT_WQ_LIST(&tctx->task_list); |
6294f368 PB |
2108 | if (!node) |
2109 | tctx->task_running = false; | |
3f18407d | 2110 | spin_unlock_irq(&tctx->task_lock); |
6294f368 PB |
2111 | if (!node) |
2112 | break; | |
3f18407d | 2113 | |
6294f368 | 2114 | do { |
3f18407d PB |
2115 | struct io_wq_work_node *next = node->next; |
2116 | struct io_kiocb *req = container_of(node, struct io_kiocb, | |
2117 | io_task_work.node); | |
2118 | ||
2119 | if (req->ctx != ctx) { | |
f237c30a | 2120 | ctx_flush_and_put(ctx, &locked); |
3f18407d | 2121 | ctx = req->ctx; |
126180b9 PB |
2122 | /* if not contended, grab and improve batching */ |
2123 | locked = mutex_trylock(&ctx->uring_lock); | |
3f18407d PB |
2124 | percpu_ref_get(&ctx->refs); |
2125 | } | |
f237c30a | 2126 | req->io_task_work.func(req, &locked); |
3f18407d | 2127 | node = next; |
6294f368 PB |
2128 | } while (node); |
2129 | ||
7cbf1722 | 2130 | cond_resched(); |
3f18407d | 2131 | } |
ebd0df2e | 2132 | |
f237c30a | 2133 | ctx_flush_and_put(ctx, &locked); |
7cbf1722 JA |
2134 | } |
2135 | ||
e09ee510 | 2136 | static void io_req_task_work_add(struct io_kiocb *req) |
7cbf1722 | 2137 | { |
c15b79de | 2138 | struct task_struct *tsk = req->task; |
7cbf1722 | 2139 | struct io_uring_task *tctx = tsk->io_uring; |
c15b79de | 2140 | enum task_work_notify_mode notify; |
e09ee510 | 2141 | struct io_wq_work_node *node; |
0b81e80c | 2142 | unsigned long flags; |
6294f368 | 2143 | bool running; |
7cbf1722 JA |
2144 | |
2145 | WARN_ON_ONCE(!tctx); | |
2146 | ||
0b81e80c | 2147 | spin_lock_irqsave(&tctx->task_lock, flags); |
7cbf1722 | 2148 | wq_list_add_tail(&req->io_task_work.node, &tctx->task_list); |
6294f368 PB |
2149 | running = tctx->task_running; |
2150 | if (!running) | |
2151 | tctx->task_running = true; | |
0b81e80c | 2152 | spin_unlock_irqrestore(&tctx->task_lock, flags); |
7cbf1722 JA |
2153 | |
2154 | /* task_work already pending, we're done */ | |
6294f368 | 2155 | if (running) |
e09ee510 | 2156 | return; |
7cbf1722 | 2157 | |
c15b79de PB |
2158 | /* |
2159 | * SQPOLL kernel thread doesn't need notification, just a wakeup. For | |
2160 | * all other cases, use TWA_SIGNAL unconditionally to ensure we're | |
2161 | * processing task_work. There's no reliable way to tell if TWA_RESUME | |
2162 | * will do the job. | |
2163 | */ | |
2164 | notify = (req->ctx->flags & IORING_SETUP_SQPOLL) ? TWA_NONE : TWA_SIGNAL; | |
c15b79de PB |
2165 | if (!task_work_add(tsk, &tctx->task_work, notify)) { |
2166 | wake_up_process(tsk); | |
e09ee510 | 2167 | return; |
c15b79de | 2168 | } |
2215bed9 | 2169 | |
0b81e80c | 2170 | spin_lock_irqsave(&tctx->task_lock, flags); |
6294f368 | 2171 | tctx->task_running = false; |
e09ee510 PB |
2172 | node = tctx->task_list.first; |
2173 | INIT_WQ_LIST(&tctx->task_list); | |
0b81e80c | 2174 | spin_unlock_irqrestore(&tctx->task_lock, flags); |
7cbf1722 | 2175 | |
e09ee510 PB |
2176 | while (node) { |
2177 | req = container_of(node, struct io_kiocb, io_task_work.node); | |
2178 | node = node->next; | |
2179 | if (llist_add(&req->io_task_work.fallback_node, | |
2180 | &req->ctx->fallback_llist)) | |
2181 | schedule_delayed_work(&req->ctx->fallback_work, 1); | |
2182 | } | |
eab30c4d PB |
2183 | } |
2184 | ||
f237c30a | 2185 | static void io_req_task_cancel(struct io_kiocb *req, bool *locked) |
c40f6379 | 2186 | { |
87ceb6a6 | 2187 | struct io_ring_ctx *ctx = req->ctx; |
c40f6379 | 2188 | |
b18a1a45 | 2189 | /* not needed for normal modes, but SQPOLL depends on it */ |
f237c30a | 2190 | io_tw_lock(ctx, locked); |
2593553a | 2191 | io_req_complete_failed(req, req->result); |
c40f6379 JA |
2192 | } |
2193 | ||
f237c30a | 2194 | static void io_req_task_submit(struct io_kiocb *req, bool *locked) |
c40f6379 JA |
2195 | { |
2196 | struct io_ring_ctx *ctx = req->ctx; | |
2197 | ||
f237c30a | 2198 | io_tw_lock(ctx, locked); |
316319e8 | 2199 | /* req->task == current here, checking PF_EXITING is safe */ |
af066f31 | 2200 | if (likely(!(req->task->flags & PF_EXITING))) |
c5eef2b9 | 2201 | __io_queue_sqe(req); |
81b6d05c | 2202 | else |
2593553a | 2203 | io_req_complete_failed(req, -EFAULT); |
c40f6379 JA |
2204 | } |
2205 | ||
2c4b8eb6 | 2206 | static void io_req_task_queue_fail(struct io_kiocb *req, int ret) |
c40f6379 | 2207 | { |
2c4b8eb6 | 2208 | req->result = ret; |
5b0a6acc | 2209 | req->io_task_work.func = io_req_task_cancel; |
e09ee510 | 2210 | io_req_task_work_add(req); |
c40f6379 JA |
2211 | } |
2212 | ||
2c4b8eb6 | 2213 | static void io_req_task_queue(struct io_kiocb *req) |
a3df7698 | 2214 | { |
5b0a6acc | 2215 | req->io_task_work.func = io_req_task_submit; |
e09ee510 | 2216 | io_req_task_work_add(req); |
a3df7698 PB |
2217 | } |
2218 | ||
773af691 JA |
2219 | static void io_req_task_queue_reissue(struct io_kiocb *req) |
2220 | { | |
2221 | req->io_task_work.func = io_queue_async_work; | |
2222 | io_req_task_work_add(req); | |
2223 | } | |
2224 | ||
f2f87370 | 2225 | static inline void io_queue_next(struct io_kiocb *req) |
c69f8dbe | 2226 | { |
9b5f7bd9 | 2227 | struct io_kiocb *nxt = io_req_find_next(req); |
944e58bf PB |
2228 | |
2229 | if (nxt) | |
906a8c3f | 2230 | io_req_task_queue(nxt); |
c69f8dbe JL |
2231 | } |
2232 | ||
c3524383 | 2233 | static void io_free_req(struct io_kiocb *req) |
7a743e22 | 2234 | { |
c3524383 PB |
2235 | io_queue_next(req); |
2236 | __io_free_req(req); | |
2237 | } | |
8766dd51 | 2238 | |
f237c30a PB |
2239 | static void io_free_req_work(struct io_kiocb *req, bool *locked) |
2240 | { | |
2241 | io_free_req(req); | |
2242 | } | |
2243 | ||
2d6500d4 | 2244 | struct req_batch { |
5af1d13e PB |
2245 | struct task_struct *task; |
2246 | int task_refs; | |
1b4c351f | 2247 | int ctx_refs; |
2d6500d4 PB |
2248 | }; |
2249 | ||
5af1d13e PB |
2250 | static inline void io_init_req_batch(struct req_batch *rb) |
2251 | { | |
5af1d13e | 2252 | rb->task_refs = 0; |
9ae72463 | 2253 | rb->ctx_refs = 0; |
5af1d13e PB |
2254 | rb->task = NULL; |
2255 | } | |
2256 | ||
2d6500d4 PB |
2257 | static void io_req_free_batch_finish(struct io_ring_ctx *ctx, |
2258 | struct req_batch *rb) | |
2259 | { | |
9ae72463 PB |
2260 | if (rb->ctx_refs) |
2261 | percpu_ref_put_many(&ctx->refs, rb->ctx_refs); | |
e98e49b2 | 2262 | if (rb->task) |
e9dbe221 | 2263 | io_put_task(rb->task, rb->task_refs); |
2d6500d4 PB |
2264 | } |
2265 | ||
6ff119a6 PB |
2266 | static void io_req_free_batch(struct req_batch *rb, struct io_kiocb *req, |
2267 | struct io_submit_state *state) | |
2d6500d4 | 2268 | { |
f2f87370 | 2269 | io_queue_next(req); |
96670657 | 2270 | io_dismantle_req(req); |
2d6500d4 | 2271 | |
e3bc8e9d | 2272 | if (req->task != rb->task) { |
7c660731 PB |
2273 | if (rb->task) |
2274 | io_put_task(rb->task, rb->task_refs); | |
e3bc8e9d JA |
2275 | rb->task = req->task; |
2276 | rb->task_refs = 0; | |
5af1d13e | 2277 | } |
e3bc8e9d | 2278 | rb->task_refs++; |
9ae72463 | 2279 | rb->ctx_refs++; |
5af1d13e | 2280 | |
bd759045 | 2281 | if (state->free_reqs != ARRAY_SIZE(state->reqs)) |
6ff119a6 | 2282 | state->reqs[state->free_reqs++] = req; |
bd759045 | 2283 | else |
cd0ca2e0 | 2284 | list_add(&req->inflight_entry, &state->free_list); |
7a743e22 PB |
2285 | } |
2286 | ||
2a2758f2 | 2287 | static void io_submit_flush_completions(struct io_ring_ctx *ctx) |
a141dd89 | 2288 | __must_hold(&ctx->uring_lock) |
905c172f | 2289 | { |
cd0ca2e0 PB |
2290 | struct io_submit_state *state = &ctx->submit_state; |
2291 | int i, nr = state->compl_nr; | |
905c172f PB |
2292 | struct req_batch rb; |
2293 | ||
79ebeaee | 2294 | spin_lock(&ctx->completion_lock); |
905c172f | 2295 | for (i = 0; i < nr; i++) { |
cd0ca2e0 | 2296 | struct io_kiocb *req = state->compl_reqs[i]; |
5182ed2e | 2297 | |
d4d19c19 PB |
2298 | __io_cqring_fill_event(ctx, req->user_data, req->result, |
2299 | req->compl.cflags); | |
905c172f PB |
2300 | } |
2301 | io_commit_cqring(ctx); | |
79ebeaee | 2302 | spin_unlock(&ctx->completion_lock); |
905c172f | 2303 | io_cqring_ev_posted(ctx); |
5182ed2e PB |
2304 | |
2305 | io_init_req_batch(&rb); | |
905c172f | 2306 | for (i = 0; i < nr; i++) { |
cd0ca2e0 | 2307 | struct io_kiocb *req = state->compl_reqs[i]; |
905c172f | 2308 | |
91c2f697 | 2309 | if (req_ref_put_and_test(req)) |
6ff119a6 | 2310 | io_req_free_batch(&rb, req, &ctx->submit_state); |
905c172f PB |
2311 | } |
2312 | ||
2313 | io_req_free_batch_finish(ctx, &rb); | |
cd0ca2e0 | 2314 | state->compl_nr = 0; |
7a743e22 PB |
2315 | } |
2316 | ||
ba816ad6 JA |
2317 | /* |
2318 | * Drop reference to request, return next in chain (if there is one) if this | |
2319 | * was the last reference to this request. | |
2320 | */ | |
0d85035a | 2321 | static inline struct io_kiocb *io_put_req_find_next(struct io_kiocb *req) |
e65ef56d | 2322 | { |
9b5f7bd9 PB |
2323 | struct io_kiocb *nxt = NULL; |
2324 | ||
de9b4cca | 2325 | if (req_ref_put_and_test(req)) { |
9b5f7bd9 | 2326 | nxt = io_req_find_next(req); |
4d7dd462 | 2327 | __io_free_req(req); |
2a44f467 | 2328 | } |
9b5f7bd9 | 2329 | return nxt; |
2b188cc1 JA |
2330 | } |
2331 | ||
0d85035a | 2332 | static inline void io_put_req(struct io_kiocb *req) |
e65ef56d | 2333 | { |
de9b4cca | 2334 | if (req_ref_put_and_test(req)) |
e65ef56d | 2335 | io_free_req(req); |
2b188cc1 JA |
2336 | } |
2337 | ||
91c2f697 | 2338 | static inline void io_put_req_deferred(struct io_kiocb *req) |
216578e5 | 2339 | { |
91c2f697 | 2340 | if (req_ref_put_and_test(req)) { |
f237c30a | 2341 | req->io_task_work.func = io_free_req_work; |
543af3a1 PB |
2342 | io_req_task_work_add(req); |
2343 | } | |
216578e5 PB |
2344 | } |
2345 | ||
6c503150 | 2346 | static unsigned io_cqring_events(struct io_ring_ctx *ctx) |
a3a0e43f JA |
2347 | { |
2348 | /* See comment at the top of this file */ | |
2349 | smp_rmb(); | |
e23de15f | 2350 | return __io_cqring_events(ctx); |
a3a0e43f JA |
2351 | } |
2352 | ||
fb5ccc98 PB |
2353 | static inline unsigned int io_sqring_entries(struct io_ring_ctx *ctx) |
2354 | { | |
2355 | struct io_rings *rings = ctx->rings; | |
2356 | ||
2357 | /* make sure SQ entry isn't read before tail */ | |
2358 | return smp_load_acquire(&rings->sq.tail) - ctx->cached_sq_head; | |
2359 | } | |
2360 | ||
8ff069bf | 2361 | static unsigned int io_put_kbuf(struct io_kiocb *req, struct io_buffer *kbuf) |
e94f141b | 2362 | { |
8ff069bf | 2363 | unsigned int cflags; |
e94f141b | 2364 | |
bcda7baa JA |
2365 | cflags = kbuf->bid << IORING_CQE_BUFFER_SHIFT; |
2366 | cflags |= IORING_CQE_F_BUFFER; | |
0e1b6fe3 | 2367 | req->flags &= ~REQ_F_BUFFER_SELECTED; |
bcda7baa JA |
2368 | kfree(kbuf); |
2369 | return cflags; | |
e94f141b JA |
2370 | } |
2371 | ||
8ff069bf | 2372 | static inline unsigned int io_put_rw_kbuf(struct io_kiocb *req) |
bcda7baa | 2373 | { |
4d954c25 | 2374 | struct io_buffer *kbuf; |
bcda7baa | 2375 | |
ae421d93 PB |
2376 | if (likely(!(req->flags & REQ_F_BUFFER_SELECTED))) |
2377 | return 0; | |
4d954c25 | 2378 | kbuf = (struct io_buffer *) (unsigned long) req->rw.addr; |
8ff069bf PB |
2379 | return io_put_kbuf(req, kbuf); |
2380 | } | |
2381 | ||
4c6e277c JA |
2382 | static inline bool io_run_task_work(void) |
2383 | { | |
ef98eb04 | 2384 | if (test_thread_flag(TIF_NOTIFY_SIGNAL) || current->task_works) { |
4c6e277c | 2385 | __set_current_state(TASK_RUNNING); |
ef98eb04 | 2386 | tracehook_notify_signal(); |
4c6e277c JA |
2387 | return true; |
2388 | } | |
2389 | ||
2390 | return false; | |
bcda7baa JA |
2391 | } |
2392 | ||
def596e9 JA |
2393 | /* |
2394 | * Find and free completed poll iocbs | |
2395 | */ | |
2396 | static void io_iopoll_complete(struct io_ring_ctx *ctx, unsigned int *nr_events, | |
a8576af9 | 2397 | struct list_head *done) |
def596e9 | 2398 | { |
8237e045 | 2399 | struct req_batch rb; |
def596e9 | 2400 | struct io_kiocb *req; |
bbde017a XW |
2401 | |
2402 | /* order with ->result store in io_complete_rw_iopoll() */ | |
2403 | smp_rmb(); | |
def596e9 | 2404 | |
5af1d13e | 2405 | io_init_req_batch(&rb); |
def596e9 | 2406 | while (!list_empty(done)) { |
d21ffe7e | 2407 | req = list_first_entry(done, struct io_kiocb, inflight_entry); |
f161340d PB |
2408 | list_del(&req->inflight_entry); |
2409 | ||
a8576af9 | 2410 | if (READ_ONCE(req->result) == -EAGAIN && |
8c130827 | 2411 | !(req->flags & REQ_F_DONT_REISSUE)) { |
bbde017a | 2412 | req->iopoll_completed = 0; |
773af691 | 2413 | io_req_task_queue_reissue(req); |
8c130827 | 2414 | continue; |
bbde017a | 2415 | } |
def596e9 | 2416 | |
ae421d93 PB |
2417 | __io_cqring_fill_event(ctx, req->user_data, req->result, |
2418 | io_put_rw_kbuf(req)); | |
def596e9 JA |
2419 | (*nr_events)++; |
2420 | ||
de9b4cca | 2421 | if (req_ref_put_and_test(req)) |
6ff119a6 | 2422 | io_req_free_batch(&rb, req, &ctx->submit_state); |
def596e9 | 2423 | } |
def596e9 | 2424 | |
09bb8394 | 2425 | io_commit_cqring(ctx); |
80c18e4a | 2426 | io_cqring_ev_posted_iopoll(ctx); |
2d6500d4 | 2427 | io_req_free_batch_finish(ctx, &rb); |
581f9810 BM |
2428 | } |
2429 | ||
def596e9 | 2430 | static int io_do_iopoll(struct io_ring_ctx *ctx, unsigned int *nr_events, |
a8576af9 | 2431 | long min) |
def596e9 JA |
2432 | { |
2433 | struct io_kiocb *req, *tmp; | |
2434 | LIST_HEAD(done); | |
2435 | bool spin; | |
def596e9 JA |
2436 | |
2437 | /* | |
2438 | * Only spin for completions if we don't have multiple devices hanging | |
2439 | * off our complete list, and we're under the requested amount. | |
2440 | */ | |
915b3dde | 2441 | spin = !ctx->poll_multi_queue && *nr_events < min; |
def596e9 | 2442 | |
d21ffe7e | 2443 | list_for_each_entry_safe(req, tmp, &ctx->iopoll_list, inflight_entry) { |
9adbd45d | 2444 | struct kiocb *kiocb = &req->rw.kiocb; |
a2416e1e | 2445 | int ret; |
def596e9 JA |
2446 | |
2447 | /* | |
581f9810 BM |
2448 | * Move completed and retryable entries to our local lists. |
2449 | * If we find a request that requires polling, break out | |
2450 | * and complete those lists first, if we have entries there. | |
def596e9 | 2451 | */ |
65a6543d | 2452 | if (READ_ONCE(req->iopoll_completed)) { |
d21ffe7e | 2453 | list_move_tail(&req->inflight_entry, &done); |
def596e9 JA |
2454 | continue; |
2455 | } | |
2456 | if (!list_empty(&done)) | |
2457 | break; | |
2458 | ||
2459 | ret = kiocb->ki_filp->f_op->iopoll(kiocb, spin); | |
a2416e1e PB |
2460 | if (unlikely(ret < 0)) |
2461 | return ret; | |
2462 | else if (ret) | |
2463 | spin = false; | |
def596e9 | 2464 | |
3aadc23e PB |
2465 | /* iopoll may have completed current req */ |
2466 | if (READ_ONCE(req->iopoll_completed)) | |
d21ffe7e | 2467 | list_move_tail(&req->inflight_entry, &done); |
def596e9 JA |
2468 | } |
2469 | ||
2470 | if (!list_empty(&done)) | |
a8576af9 | 2471 | io_iopoll_complete(ctx, nr_events, &done); |
def596e9 | 2472 | |
a2416e1e | 2473 | return 0; |
def596e9 JA |
2474 | } |
2475 | ||
def596e9 JA |
2476 | /* |
2477 | * We can't just wait for polled events to come to us, we have to actively | |
2478 | * find and complete them. | |
2479 | */ | |
b2edc0a7 | 2480 | static void io_iopoll_try_reap_events(struct io_ring_ctx *ctx) |
def596e9 JA |
2481 | { |
2482 | if (!(ctx->flags & IORING_SETUP_IOPOLL)) | |
2483 | return; | |
2484 | ||
2485 | mutex_lock(&ctx->uring_lock); | |
540e32a0 | 2486 | while (!list_empty(&ctx->iopoll_list)) { |
def596e9 JA |
2487 | unsigned int nr_events = 0; |
2488 | ||
a8576af9 | 2489 | io_do_iopoll(ctx, &nr_events, 0); |
08f5439f | 2490 | |
b2edc0a7 PB |
2491 | /* let it sleep and repeat later if can't complete a request */ |
2492 | if (nr_events == 0) | |
2493 | break; | |
08f5439f JA |
2494 | /* |
2495 | * Ensure we allow local-to-the-cpu processing to take place, | |
2496 | * in this case we need to ensure that we reap all events. | |
3fcee5a6 | 2497 | * Also let task_work, etc. to progress by releasing the mutex |
08f5439f | 2498 | */ |
3fcee5a6 PB |
2499 | if (need_resched()) { |
2500 | mutex_unlock(&ctx->uring_lock); | |
2501 | cond_resched(); | |
2502 | mutex_lock(&ctx->uring_lock); | |
2503 | } | |
def596e9 JA |
2504 | } |
2505 | mutex_unlock(&ctx->uring_lock); | |
2506 | } | |
2507 | ||
7668b92a | 2508 | static int io_iopoll_check(struct io_ring_ctx *ctx, long min) |
def596e9 | 2509 | { |
7668b92a | 2510 | unsigned int nr_events = 0; |
e9979b36 | 2511 | int ret = 0; |
500f9fba | 2512 | |
c7849be9 XW |
2513 | /* |
2514 | * We disallow the app entering submit/complete with polling, but we | |
2515 | * still need to lock the ring to prevent racing with polled issue | |
2516 | * that got punted to a workqueue. | |
2517 | */ | |
2518 | mutex_lock(&ctx->uring_lock); | |
f39c8a5b PB |
2519 | /* |
2520 | * Don't enter poll loop if we already have events pending. | |
2521 | * If we do, we can potentially be spinning for commands that | |
2522 | * already triggered a CQE (eg in error). | |
2523 | */ | |
5ed7a37d | 2524 | if (test_bit(0, &ctx->check_cq_overflow)) |
f39c8a5b PB |
2525 | __io_cqring_overflow_flush(ctx, false); |
2526 | if (io_cqring_events(ctx)) | |
2527 | goto out; | |
def596e9 | 2528 | do { |
500f9fba JA |
2529 | /* |
2530 | * If a submit got punted to a workqueue, we can have the | |
2531 | * application entering polling for a command before it gets | |
2532 | * issued. That app will hold the uring_lock for the duration | |
2533 | * of the poll right here, so we need to take a breather every | |
2534 | * now and then to ensure that the issue has a chance to add | |
2535 | * the poll to the issued list. Otherwise we can spin here | |
2536 | * forever, while the workqueue is stuck trying to acquire the | |
2537 | * very same mutex. | |
2538 | */ | |
e9979b36 | 2539 | if (list_empty(&ctx->iopoll_list)) { |
8f487ef2 PB |
2540 | u32 tail = ctx->cached_cq_tail; |
2541 | ||
500f9fba | 2542 | mutex_unlock(&ctx->uring_lock); |
4c6e277c | 2543 | io_run_task_work(); |
500f9fba | 2544 | mutex_lock(&ctx->uring_lock); |
def596e9 | 2545 | |
8f487ef2 PB |
2546 | /* some requests don't go through iopoll_list */ |
2547 | if (tail != ctx->cached_cq_tail || | |
2548 | list_empty(&ctx->iopoll_list)) | |
e9979b36 | 2549 | break; |
500f9fba | 2550 | } |
a8576af9 | 2551 | ret = io_do_iopoll(ctx, &nr_events, min); |
f39c8a5b PB |
2552 | } while (!ret && nr_events < min && !need_resched()); |
2553 | out: | |
500f9fba | 2554 | mutex_unlock(&ctx->uring_lock); |
def596e9 JA |
2555 | return ret; |
2556 | } | |
2557 | ||
491381ce | 2558 | static void kiocb_end_write(struct io_kiocb *req) |
2b188cc1 | 2559 | { |
491381ce JA |
2560 | /* |
2561 | * Tell lockdep we inherited freeze protection from submission | |
2562 | * thread. | |
2563 | */ | |
2564 | if (req->flags & REQ_F_ISREG) { | |
1c98679d | 2565 | struct super_block *sb = file_inode(req->file)->i_sb; |
2b188cc1 | 2566 | |
1c98679d PB |
2567 | __sb_writers_acquired(sb, SB_FREEZE_WRITE); |
2568 | sb_end_write(sb); | |
2b188cc1 JA |
2569 | } |
2570 | } | |
2571 | ||
b63534c4 | 2572 | #ifdef CONFIG_BLOCK |
dc2a6e9a | 2573 | static bool io_resubmit_prep(struct io_kiocb *req) |
b63534c4 | 2574 | { |
ab454438 | 2575 | struct io_async_rw *rw = req->async_data; |
b63534c4 | 2576 | |
ab454438 PB |
2577 | if (!rw) |
2578 | return !io_req_prep_async(req); | |
2579 | /* may have left rw->iter inconsistent on -EIOCBQUEUED */ | |
2580 | iov_iter_revert(&rw->iter, req->result - iov_iter_count(&rw->iter)); | |
2581 | return true; | |
b63534c4 | 2582 | } |
b63534c4 | 2583 | |
3e6a0d3c | 2584 | static bool io_rw_should_reissue(struct io_kiocb *req) |
b63534c4 | 2585 | { |
355afaeb | 2586 | umode_t mode = file_inode(req->file)->i_mode; |
3e6a0d3c | 2587 | struct io_ring_ctx *ctx = req->ctx; |
b63534c4 | 2588 | |
355afaeb JA |
2589 | if (!S_ISBLK(mode) && !S_ISREG(mode)) |
2590 | return false; | |
3e6a0d3c JA |
2591 | if ((req->flags & REQ_F_NOWAIT) || (io_wq_current_is_worker() && |
2592 | !(ctx->flags & IORING_SETUP_IOPOLL))) | |
b63534c4 | 2593 | return false; |
7c977a58 JA |
2594 | /* |
2595 | * If ref is dying, we might be running poll reap from the exit work. | |
2596 | * Don't attempt to reissue from that path, just let it fail with | |
2597 | * -EAGAIN. | |
2598 | */ | |
3e6a0d3c JA |
2599 | if (percpu_ref_is_dying(&ctx->refs)) |
2600 | return false; | |
ef046888 JA |
2601 | /* |
2602 | * Play it safe and assume not safe to re-import and reissue if we're | |
2603 | * not in the original thread group (or in task context). | |
2604 | */ | |
2605 | if (!same_thread_group(req->task, current) || !in_task()) | |
2606 | return false; | |
3e6a0d3c JA |
2607 | return true; |
2608 | } | |
e82ad485 | 2609 | #else |
a1ff1e3f | 2610 | static bool io_resubmit_prep(struct io_kiocb *req) |
e82ad485 JA |
2611 | { |
2612 | return false; | |
2613 | } | |
e82ad485 | 2614 | static bool io_rw_should_reissue(struct io_kiocb *req) |
3e6a0d3c | 2615 | { |
b63534c4 JA |
2616 | return false; |
2617 | } | |
3e6a0d3c | 2618 | #endif |
b63534c4 | 2619 | |
8ef12efe | 2620 | static bool __io_complete_rw_common(struct io_kiocb *req, long res) |
a1d7c393 | 2621 | { |
b65c128f PB |
2622 | if (req->rw.kiocb.ki_flags & IOCB_WRITE) |
2623 | kiocb_end_write(req); | |
9532b99b PB |
2624 | if (res != req->result) { |
2625 | if ((res == -EAGAIN || res == -EOPNOTSUPP) && | |
2626 | io_rw_should_reissue(req)) { | |
2627 | req->flags |= REQ_F_REISSUE; | |
8ef12efe | 2628 | return true; |
9532b99b | 2629 | } |
93d2bcd2 | 2630 | req_set_fail(req); |
8ef12efe | 2631 | req->result = res; |
9532b99b | 2632 | } |
8ef12efe JA |
2633 | return false; |
2634 | } | |
2635 | ||
f237c30a | 2636 | static void io_req_task_complete(struct io_kiocb *req, bool *locked) |
8ef12efe | 2637 | { |
126180b9 PB |
2638 | unsigned int cflags = io_put_rw_kbuf(req); |
2639 | long res = req->result; | |
2640 | ||
2641 | if (*locked) { | |
2642 | struct io_ring_ctx *ctx = req->ctx; | |
2643 | struct io_submit_state *state = &ctx->submit_state; | |
2644 | ||
2645 | io_req_complete_state(req, res, cflags); | |
2646 | state->compl_reqs[state->compl_nr++] = req; | |
2647 | if (state->compl_nr == ARRAY_SIZE(state->compl_reqs)) | |
2648 | io_submit_flush_completions(ctx); | |
2649 | } else { | |
2650 | io_req_complete_post(req, res, cflags); | |
2651 | } | |
8ef12efe JA |
2652 | } |
2653 | ||
2654 | static void __io_complete_rw(struct io_kiocb *req, long res, long res2, | |
2655 | unsigned int issue_flags) | |
2656 | { | |
2657 | if (__io_complete_rw_common(req, res)) | |
2658 | return; | |
f237c30a | 2659 | __io_req_complete(req, 0, req->result, io_put_rw_kbuf(req)); |
ba816ad6 JA |
2660 | } |
2661 | ||
2662 | static void io_complete_rw(struct kiocb *kiocb, long res, long res2) | |
2663 | { | |
9adbd45d | 2664 | struct io_kiocb *req = container_of(kiocb, struct io_kiocb, rw.kiocb); |
ba816ad6 | 2665 | |
8ef12efe JA |
2666 | if (__io_complete_rw_common(req, res)) |
2667 | return; | |
2668 | req->result = res; | |
2669 | req->io_task_work.func = io_req_task_complete; | |
2670 | io_req_task_work_add(req); | |
2b188cc1 JA |
2671 | } |
2672 | ||
def596e9 JA |
2673 | static void io_complete_rw_iopoll(struct kiocb *kiocb, long res, long res2) |
2674 | { | |
9adbd45d | 2675 | struct io_kiocb *req = container_of(kiocb, struct io_kiocb, rw.kiocb); |
def596e9 | 2676 | |
491381ce JA |
2677 | if (kiocb->ki_flags & IOCB_WRITE) |
2678 | kiocb_end_write(req); | |
9532b99b | 2679 | if (unlikely(res != req->result)) { |
a1ff1e3f JA |
2680 | if (!(res == -EAGAIN && io_rw_should_reissue(req) && |
2681 | io_resubmit_prep(req))) { | |
93d2bcd2 | 2682 | req_set_fail(req); |
9532b99b PB |
2683 | req->flags |= REQ_F_DONT_REISSUE; |
2684 | } | |
8c130827 | 2685 | } |
bbde017a XW |
2686 | |
2687 | WRITE_ONCE(req->result, res); | |
b9b0e0d3 | 2688 | /* order with io_iopoll_complete() checking ->result */ |
cd664b0e PB |
2689 | smp_wmb(); |
2690 | WRITE_ONCE(req->iopoll_completed, 1); | |
def596e9 JA |
2691 | } |
2692 | ||
2693 | /* | |
2694 | * After the iocb has been issued, it's safe to be found on the poll list. | |
2695 | * Adding the kiocb to the list AFTER submission ensures that we don't | |
f39c8a5b | 2696 | * find it from a io_do_iopoll() thread before the issuer is done |
def596e9 JA |
2697 | * accessing the kiocb cookie. |
2698 | */ | |
cb3d8972 | 2699 | static void io_iopoll_req_issued(struct io_kiocb *req) |
def596e9 JA |
2700 | { |
2701 | struct io_ring_ctx *ctx = req->ctx; | |
cb3d8972 PB |
2702 | const bool in_async = io_wq_current_is_worker(); |
2703 | ||
2704 | /* workqueue context doesn't hold uring_lock, grab it now */ | |
2705 | if (unlikely(in_async)) | |
2706 | mutex_lock(&ctx->uring_lock); | |
def596e9 JA |
2707 | |
2708 | /* | |
2709 | * Track whether we have multiple files in our lists. This will impact | |
2710 | * how we do polling eventually, not spinning if we're on potentially | |
2711 | * different devices. | |
2712 | */ | |
540e32a0 | 2713 | if (list_empty(&ctx->iopoll_list)) { |
915b3dde HX |
2714 | ctx->poll_multi_queue = false; |
2715 | } else if (!ctx->poll_multi_queue) { | |
def596e9 | 2716 | struct io_kiocb *list_req; |
915b3dde | 2717 | unsigned int queue_num0, queue_num1; |
def596e9 | 2718 | |
540e32a0 | 2719 | list_req = list_first_entry(&ctx->iopoll_list, struct io_kiocb, |
d21ffe7e | 2720 | inflight_entry); |
915b3dde HX |
2721 | |
2722 | if (list_req->file != req->file) { | |
2723 | ctx->poll_multi_queue = true; | |
2724 | } else { | |
2725 | queue_num0 = blk_qc_t_to_queue_num(list_req->rw.kiocb.ki_cookie); | |
2726 | queue_num1 = blk_qc_t_to_queue_num(req->rw.kiocb.ki_cookie); | |
2727 | if (queue_num0 != queue_num1) | |
2728 | ctx->poll_multi_queue = true; | |
2729 | } | |
def596e9 JA |
2730 | } |
2731 | ||
2732 | /* | |
2733 | * For fast devices, IO may have already completed. If it has, add | |
2734 | * it to the front so we find it first. | |
2735 | */ | |
65a6543d | 2736 | if (READ_ONCE(req->iopoll_completed)) |
d21ffe7e | 2737 | list_add(&req->inflight_entry, &ctx->iopoll_list); |
def596e9 | 2738 | else |
d21ffe7e | 2739 | list_add_tail(&req->inflight_entry, &ctx->iopoll_list); |
bdcd3eab | 2740 | |
cb3d8972 PB |
2741 | if (unlikely(in_async)) { |
2742 | /* | |
2743 | * If IORING_SETUP_SQPOLL is enabled, sqes are either handle | |
2744 | * in sq thread task context or in io worker task context. If | |
2745 | * current task context is sq thread, we don't need to check | |
2746 | * whether should wake up sq thread. | |
2747 | */ | |
2748 | if ((ctx->flags & IORING_SETUP_SQPOLL) && | |
2749 | wq_has_sleeper(&ctx->sq_data->wait)) | |
2750 | wake_up(&ctx->sq_data->wait); | |
2751 | ||
2752 | mutex_unlock(&ctx->uring_lock); | |
2753 | } | |
def596e9 JA |
2754 | } |
2755 | ||
4503b767 JA |
2756 | static bool io_bdev_nowait(struct block_device *bdev) |
2757 | { | |
9ba0d0c8 | 2758 | return !bdev || blk_queue_nowait(bdev_get_queue(bdev)); |
4503b767 JA |
2759 | } |
2760 | ||
2b188cc1 JA |
2761 | /* |
2762 | * If we tracked the file through the SCM inflight mechanism, we could support | |
2763 | * any file. For now, just ensure that anything potentially problematic is done | |
2764 | * inline. | |
2765 | */ | |
b191e2df | 2766 | static bool __io_file_supports_nowait(struct file *file, int rw) |
2b188cc1 JA |
2767 | { |
2768 | umode_t mode = file_inode(file)->i_mode; | |
2769 | ||
4503b767 | 2770 | if (S_ISBLK(mode)) { |
4e7b5671 CH |
2771 | if (IS_ENABLED(CONFIG_BLOCK) && |
2772 | io_bdev_nowait(I_BDEV(file->f_mapping->host))) | |
4503b767 JA |
2773 | return true; |
2774 | return false; | |
2775 | } | |
976517f1 | 2776 | if (S_ISSOCK(mode)) |
2b188cc1 | 2777 | return true; |
4503b767 | 2778 | if (S_ISREG(mode)) { |
4e7b5671 CH |
2779 | if (IS_ENABLED(CONFIG_BLOCK) && |
2780 | io_bdev_nowait(file->f_inode->i_sb->s_bdev) && | |
4503b767 JA |
2781 | file->f_op != &io_uring_fops) |
2782 | return true; | |
2783 | return false; | |
2784 | } | |
2b188cc1 | 2785 | |
c5b85625 JA |
2786 | /* any ->read/write should understand O_NONBLOCK */ |
2787 | if (file->f_flags & O_NONBLOCK) | |
2788 | return true; | |
2789 | ||
af197f50 JA |
2790 | if (!(file->f_mode & FMODE_NOWAIT)) |
2791 | return false; | |
2792 | ||
2793 | if (rw == READ) | |
2794 | return file->f_op->read_iter != NULL; | |
2795 | ||
2796 | return file->f_op->write_iter != NULL; | |
2b188cc1 JA |
2797 | } |
2798 | ||
b191e2df | 2799 | static bool io_file_supports_nowait(struct io_kiocb *req, int rw) |
7b29f92d | 2800 | { |
b191e2df | 2801 | if (rw == READ && (req->flags & REQ_F_NOWAIT_READ)) |
7b29f92d | 2802 | return true; |
b191e2df | 2803 | else if (rw == WRITE && (req->flags & REQ_F_NOWAIT_WRITE)) |
7b29f92d JA |
2804 | return true; |
2805 | ||
b191e2df | 2806 | return __io_file_supports_nowait(req->file, rw); |
7b29f92d JA |
2807 | } |
2808 | ||
a88fc400 | 2809 | static int io_prep_rw(struct io_kiocb *req, const struct io_uring_sqe *sqe) |
2b188cc1 | 2810 | { |
def596e9 | 2811 | struct io_ring_ctx *ctx = req->ctx; |
9adbd45d | 2812 | struct kiocb *kiocb = &req->rw.kiocb; |
75c668cd | 2813 | struct file *file = req->file; |
09bb8394 JA |
2814 | unsigned ioprio; |
2815 | int ret; | |
2b188cc1 | 2816 | |
c97d8a0f | 2817 | if (!io_req_ffs_set(req) && S_ISREG(file_inode(file)->i_mode)) |
491381ce JA |
2818 | req->flags |= REQ_F_ISREG; |
2819 | ||
2b188cc1 | 2820 | kiocb->ki_pos = READ_ONCE(sqe->off); |
75c668cd | 2821 | if (kiocb->ki_pos == -1 && !(file->f_mode & FMODE_STREAM)) { |
ba04291e | 2822 | req->flags |= REQ_F_CUR_POS; |
75c668cd | 2823 | kiocb->ki_pos = file->f_pos; |
ba04291e | 2824 | } |
2b188cc1 | 2825 | kiocb->ki_hint = ki_hint_validate(file_write_hint(kiocb->ki_filp)); |
3e577dcd PB |
2826 | kiocb->ki_flags = iocb_flags(kiocb->ki_filp); |
2827 | ret = kiocb_set_rw_flags(kiocb, READ_ONCE(sqe->rw_flags)); | |
2828 | if (unlikely(ret)) | |
2829 | return ret; | |
2b188cc1 | 2830 | |
75c668cd PB |
2831 | /* don't allow async punt for O_NONBLOCK or RWF_NOWAIT */ |
2832 | if ((kiocb->ki_flags & IOCB_NOWAIT) || (file->f_flags & O_NONBLOCK)) | |
2833 | req->flags |= REQ_F_NOWAIT; | |
2834 | ||
2b188cc1 JA |
2835 | ioprio = READ_ONCE(sqe->ioprio); |
2836 | if (ioprio) { | |
2837 | ret = ioprio_check_cap(ioprio); | |
2838 | if (ret) | |
09bb8394 | 2839 | return ret; |
2b188cc1 JA |
2840 | |
2841 | kiocb->ki_ioprio = ioprio; | |
2842 | } else | |
2843 | kiocb->ki_ioprio = get_current_ioprio(); | |
2844 | ||
def596e9 | 2845 | if (ctx->flags & IORING_SETUP_IOPOLL) { |
def596e9 JA |
2846 | if (!(kiocb->ki_flags & IOCB_DIRECT) || |
2847 | !kiocb->ki_filp->f_op->iopoll) | |
09bb8394 | 2848 | return -EOPNOTSUPP; |
2b188cc1 | 2849 | |
def596e9 JA |
2850 | kiocb->ki_flags |= IOCB_HIPRI; |
2851 | kiocb->ki_complete = io_complete_rw_iopoll; | |
65a6543d | 2852 | req->iopoll_completed = 0; |
def596e9 | 2853 | } else { |
09bb8394 JA |
2854 | if (kiocb->ki_flags & IOCB_HIPRI) |
2855 | return -EINVAL; | |
def596e9 JA |
2856 | kiocb->ki_complete = io_complete_rw; |
2857 | } | |
9adbd45d | 2858 | |
eae071c9 PB |
2859 | if (req->opcode == IORING_OP_READ_FIXED || |
2860 | req->opcode == IORING_OP_WRITE_FIXED) { | |
2861 | req->imu = NULL; | |
2862 | io_req_set_rsrc_node(req); | |
2863 | } | |
2864 | ||
3529d8c2 JA |
2865 | req->rw.addr = READ_ONCE(sqe->addr); |
2866 | req->rw.len = READ_ONCE(sqe->len); | |
4f4eeba8 | 2867 | req->buf_index = READ_ONCE(sqe->buf_index); |
2b188cc1 | 2868 | return 0; |
2b188cc1 JA |
2869 | } |
2870 | ||
2871 | static inline void io_rw_done(struct kiocb *kiocb, ssize_t ret) | |
2872 | { | |
2873 | switch (ret) { | |
2874 | case -EIOCBQUEUED: | |
2875 | break; | |
2876 | case -ERESTARTSYS: | |
2877 | case -ERESTARTNOINTR: | |
2878 | case -ERESTARTNOHAND: | |
2879 | case -ERESTART_RESTARTBLOCK: | |
2880 | /* | |
2881 | * We can't just restart the syscall, since previously | |
2882 | * submitted sqes may already be in progress. Just fail this | |
2883 | * IO with EINTR. | |
2884 | */ | |
2885 | ret = -EINTR; | |
df561f66 | 2886 | fallthrough; |
2b188cc1 JA |
2887 | default: |
2888 | kiocb->ki_complete(kiocb, ret, 0); | |
2889 | } | |
2890 | } | |
2891 | ||
a1d7c393 | 2892 | static void kiocb_done(struct kiocb *kiocb, ssize_t ret, |
889fca73 | 2893 | unsigned int issue_flags) |
ba816ad6 | 2894 | { |
ba04291e | 2895 | struct io_kiocb *req = container_of(kiocb, struct io_kiocb, rw.kiocb); |
e8c2bc1f | 2896 | struct io_async_rw *io = req->async_data; |
97284637 | 2897 | bool check_reissue = kiocb->ki_complete == io_complete_rw; |
ba04291e | 2898 | |
227c0c96 | 2899 | /* add previously done IO, if any */ |
e8c2bc1f | 2900 | if (io && io->bytes_done > 0) { |
227c0c96 | 2901 | if (ret < 0) |
e8c2bc1f | 2902 | ret = io->bytes_done; |
227c0c96 | 2903 | else |
e8c2bc1f | 2904 | ret += io->bytes_done; |
227c0c96 JA |
2905 | } |
2906 | ||
ba04291e JA |
2907 | if (req->flags & REQ_F_CUR_POS) |
2908 | req->file->f_pos = kiocb->ki_pos; | |
e149bd74 | 2909 | if (ret >= 0 && check_reissue) |
889fca73 | 2910 | __io_complete_rw(req, ret, 0, issue_flags); |
ba816ad6 JA |
2911 | else |
2912 | io_rw_done(kiocb, ret); | |
97284637 | 2913 | |
fe7e3257 | 2914 | if (check_reissue && (req->flags & REQ_F_REISSUE)) { |
97284637 | 2915 | req->flags &= ~REQ_F_REISSUE; |
a7be7c23 | 2916 | if (io_resubmit_prep(req)) { |
773af691 | 2917 | io_req_task_queue_reissue(req); |
8c130827 | 2918 | } else { |
93d2bcd2 | 2919 | req_set_fail(req); |
ae421d93 PB |
2920 | __io_req_complete(req, issue_flags, ret, |
2921 | io_put_rw_kbuf(req)); | |
97284637 PB |
2922 | } |
2923 | } | |
ba816ad6 JA |
2924 | } |
2925 | ||
eae071c9 PB |
2926 | static int __io_import_fixed(struct io_kiocb *req, int rw, struct iov_iter *iter, |
2927 | struct io_mapped_ubuf *imu) | |
edafccee | 2928 | { |
9adbd45d | 2929 | size_t len = req->rw.len; |
75769e3f | 2930 | u64 buf_end, buf_addr = req->rw.addr; |
edafccee | 2931 | size_t offset; |
edafccee | 2932 | |
75769e3f | 2933 | if (unlikely(check_add_overflow(buf_addr, (u64)len, &buf_end))) |
edafccee JA |
2934 | return -EFAULT; |
2935 | /* not inside the mapped region */ | |
4751f53d | 2936 | if (unlikely(buf_addr < imu->ubuf || buf_end > imu->ubuf_end)) |
edafccee JA |
2937 | return -EFAULT; |
2938 | ||
2939 | /* | |
2940 | * May not be a start of buffer, set size appropriately | |
2941 | * and advance us to the beginning. | |
2942 | */ | |
2943 | offset = buf_addr - imu->ubuf; | |
2944 | iov_iter_bvec(iter, rw, imu->bvec, imu->nr_bvecs, offset + len); | |
bd11b3a3 JA |
2945 | |
2946 | if (offset) { | |
2947 | /* | |
2948 | * Don't use iov_iter_advance() here, as it's really slow for | |
2949 | * using the latter parts of a big fixed buffer - it iterates | |
2950 | * over each segment manually. We can cheat a bit here, because | |
2951 | * we know that: | |
2952 | * | |
2953 | * 1) it's a BVEC iter, we set it up | |
2954 | * 2) all bvecs are PAGE_SIZE in size, except potentially the | |
2955 | * first and last bvec | |
2956 | * | |
2957 | * So just find our index, and adjust the iterator afterwards. | |
2958 | * If the offset is within the first bvec (or the whole first | |
2959 | * bvec, just use iov_iter_advance(). This makes it easier | |
2960 | * since we can just skip the first segment, which may not | |
2961 | * be PAGE_SIZE aligned. | |
2962 | */ | |
2963 | const struct bio_vec *bvec = imu->bvec; | |
2964 | ||
2965 | if (offset <= bvec->bv_len) { | |
2966 | iov_iter_advance(iter, offset); | |
2967 | } else { | |
2968 | unsigned long seg_skip; | |
2969 | ||
2970 | /* skip first vec */ | |
2971 | offset -= bvec->bv_len; | |
2972 | seg_skip = 1 + (offset >> PAGE_SHIFT); | |
2973 | ||
2974 | iter->bvec = bvec + seg_skip; | |
2975 | iter->nr_segs -= seg_skip; | |
99c79f66 | 2976 | iter->count -= bvec->bv_len + offset; |
bd11b3a3 | 2977 | iter->iov_offset = offset & ~PAGE_MASK; |
bd11b3a3 JA |
2978 | } |
2979 | } | |
2980 | ||
847595de | 2981 | return 0; |
edafccee JA |
2982 | } |
2983 | ||
eae071c9 PB |
2984 | static int io_import_fixed(struct io_kiocb *req, int rw, struct iov_iter *iter) |
2985 | { | |
2986 | struct io_ring_ctx *ctx = req->ctx; | |
2987 | struct io_mapped_ubuf *imu = req->imu; | |
2988 | u16 index, buf_index = req->buf_index; | |
2989 | ||
2990 | if (likely(!imu)) { | |
2991 | if (unlikely(buf_index >= ctx->nr_user_bufs)) | |
2992 | return -EFAULT; | |
2993 | index = array_index_nospec(buf_index, ctx->nr_user_bufs); | |
2994 | imu = READ_ONCE(ctx->user_bufs[index]); | |
2995 | req->imu = imu; | |
2996 | } | |
2997 | return __io_import_fixed(req, rw, iter, imu); | |
2998 | } | |
2999 | ||
bcda7baa JA |
3000 | static void io_ring_submit_unlock(struct io_ring_ctx *ctx, bool needs_lock) |
3001 | { | |
3002 | if (needs_lock) | |
3003 | mutex_unlock(&ctx->uring_lock); | |
3004 | } | |
3005 | ||
3006 | static void io_ring_submit_lock(struct io_ring_ctx *ctx, bool needs_lock) | |
3007 | { | |
3008 | /* | |
3009 | * "Normal" inline submissions always hold the uring_lock, since we | |
3010 | * grab it from the system call. Same is true for the SQPOLL offload. | |
3011 | * The only exception is when we've detached the request and issue it | |
3012 | * from an async worker thread, grab the lock for that case. | |
3013 | */ | |
3014 | if (needs_lock) | |
3015 | mutex_lock(&ctx->uring_lock); | |
3016 | } | |
3017 | ||
3018 | static struct io_buffer *io_buffer_select(struct io_kiocb *req, size_t *len, | |
3019 | int bgid, struct io_buffer *kbuf, | |
3020 | bool needs_lock) | |
3021 | { | |
3022 | struct io_buffer *head; | |
3023 | ||
3024 | if (req->flags & REQ_F_BUFFER_SELECTED) | |
3025 | return kbuf; | |
3026 | ||
3027 | io_ring_submit_lock(req->ctx, needs_lock); | |
3028 | ||
3029 | lockdep_assert_held(&req->ctx->uring_lock); | |
3030 | ||
9e15c3a0 | 3031 | head = xa_load(&req->ctx->io_buffers, bgid); |
bcda7baa JA |
3032 | if (head) { |
3033 | if (!list_empty(&head->list)) { | |
3034 | kbuf = list_last_entry(&head->list, struct io_buffer, | |
3035 | list); | |
3036 | list_del(&kbuf->list); | |
3037 | } else { | |
3038 | kbuf = head; | |
9e15c3a0 | 3039 | xa_erase(&req->ctx->io_buffers, bgid); |
bcda7baa JA |
3040 | } |
3041 | if (*len > kbuf->len) | |
3042 | *len = kbuf->len; | |
3043 | } else { | |
3044 | kbuf = ERR_PTR(-ENOBUFS); | |
3045 | } | |
3046 | ||
3047 | io_ring_submit_unlock(req->ctx, needs_lock); | |
3048 | ||
3049 | return kbuf; | |
3050 | } | |
3051 | ||
4d954c25 JA |
3052 | static void __user *io_rw_buffer_select(struct io_kiocb *req, size_t *len, |
3053 | bool needs_lock) | |
3054 | { | |
3055 | struct io_buffer *kbuf; | |
4f4eeba8 | 3056 | u16 bgid; |
4d954c25 JA |
3057 | |
3058 | kbuf = (struct io_buffer *) (unsigned long) req->rw.addr; | |
4f4eeba8 | 3059 | bgid = req->buf_index; |
4d954c25 JA |
3060 | kbuf = io_buffer_select(req, len, bgid, kbuf, needs_lock); |
3061 | if (IS_ERR(kbuf)) | |
3062 | return kbuf; | |
3063 | req->rw.addr = (u64) (unsigned long) kbuf; | |
3064 | req->flags |= REQ_F_BUFFER_SELECTED; | |
3065 | return u64_to_user_ptr(kbuf->addr); | |
3066 | } | |
3067 | ||
3068 | #ifdef CONFIG_COMPAT | |
3069 | static ssize_t io_compat_import(struct io_kiocb *req, struct iovec *iov, | |
3070 | bool needs_lock) | |
3071 | { | |
3072 | struct compat_iovec __user *uiov; | |
3073 | compat_ssize_t clen; | |
3074 | void __user *buf; | |
3075 | ssize_t len; | |
3076 | ||
3077 | uiov = u64_to_user_ptr(req->rw.addr); | |
3078 | if (!access_ok(uiov, sizeof(*uiov))) | |
3079 | return -EFAULT; | |
3080 | if (__get_user(clen, &uiov->iov_len)) | |
3081 | return -EFAULT; | |
3082 | if (clen < 0) | |
3083 | return -EINVAL; | |
3084 | ||
3085 | len = clen; | |
3086 | buf = io_rw_buffer_select(req, &len, needs_lock); | |
3087 | if (IS_ERR(buf)) | |
3088 | return PTR_ERR(buf); | |
3089 | iov[0].iov_base = buf; | |
3090 | iov[0].iov_len = (compat_size_t) len; | |
3091 | return 0; | |
3092 | } | |
3093 | #endif | |
3094 | ||
3095 | static ssize_t __io_iov_buffer_select(struct io_kiocb *req, struct iovec *iov, | |
3096 | bool needs_lock) | |
3097 | { | |
3098 | struct iovec __user *uiov = u64_to_user_ptr(req->rw.addr); | |
3099 | void __user *buf; | |
3100 | ssize_t len; | |
3101 | ||
3102 | if (copy_from_user(iov, uiov, sizeof(*uiov))) | |
3103 | return -EFAULT; | |
3104 | ||
3105 | len = iov[0].iov_len; | |
3106 | if (len < 0) | |
3107 | return -EINVAL; | |
3108 | buf = io_rw_buffer_select(req, &len, needs_lock); | |
3109 | if (IS_ERR(buf)) | |
3110 | return PTR_ERR(buf); | |
3111 | iov[0].iov_base = buf; | |
3112 | iov[0].iov_len = len; | |
3113 | return 0; | |
3114 | } | |
3115 | ||
3116 | static ssize_t io_iov_buffer_select(struct io_kiocb *req, struct iovec *iov, | |
3117 | bool needs_lock) | |
3118 | { | |
dddb3e26 JA |
3119 | if (req->flags & REQ_F_BUFFER_SELECTED) { |
3120 | struct io_buffer *kbuf; | |
3121 | ||
3122 | kbuf = (struct io_buffer *) (unsigned long) req->rw.addr; | |
3123 | iov[0].iov_base = u64_to_user_ptr(kbuf->addr); | |
3124 | iov[0].iov_len = kbuf->len; | |
4d954c25 | 3125 | return 0; |
dddb3e26 | 3126 | } |
dd201662 | 3127 | if (req->rw.len != 1) |
4d954c25 JA |
3128 | return -EINVAL; |
3129 | ||
3130 | #ifdef CONFIG_COMPAT | |
3131 | if (req->ctx->compat) | |
3132 | return io_compat_import(req, iov, needs_lock); | |
3133 | #endif | |
3134 | ||
3135 | return __io_iov_buffer_select(req, iov, needs_lock); | |
3136 | } | |
3137 | ||
847595de PB |
3138 | static int io_import_iovec(int rw, struct io_kiocb *req, struct iovec **iovec, |
3139 | struct iov_iter *iter, bool needs_lock) | |
2b188cc1 | 3140 | { |
9adbd45d JA |
3141 | void __user *buf = u64_to_user_ptr(req->rw.addr); |
3142 | size_t sqe_len = req->rw.len; | |
847595de | 3143 | u8 opcode = req->opcode; |
4d954c25 | 3144 | ssize_t ret; |
edafccee | 3145 | |
7d009165 | 3146 | if (opcode == IORING_OP_READ_FIXED || opcode == IORING_OP_WRITE_FIXED) { |
edafccee | 3147 | *iovec = NULL; |
9adbd45d | 3148 | return io_import_fixed(req, rw, iter); |
edafccee | 3149 | } |
2b188cc1 | 3150 | |
bcda7baa | 3151 | /* buffer index only valid with fixed read/write, or buffer select */ |
4f4eeba8 | 3152 | if (req->buf_index && !(req->flags & REQ_F_BUFFER_SELECT)) |
9adbd45d JA |
3153 | return -EINVAL; |
3154 | ||
3a6820f2 | 3155 | if (opcode == IORING_OP_READ || opcode == IORING_OP_WRITE) { |
bcda7baa | 3156 | if (req->flags & REQ_F_BUFFER_SELECT) { |
4d954c25 | 3157 | buf = io_rw_buffer_select(req, &sqe_len, needs_lock); |
867a23ea | 3158 | if (IS_ERR(buf)) |
4d954c25 | 3159 | return PTR_ERR(buf); |
3f9d6441 | 3160 | req->rw.len = sqe_len; |
bcda7baa JA |
3161 | } |
3162 | ||
3a6820f2 JA |
3163 | ret = import_single_range(rw, buf, sqe_len, *iovec, iter); |
3164 | *iovec = NULL; | |
10fc72e4 | 3165 | return ret; |
3a6820f2 JA |
3166 | } |
3167 | ||
4d954c25 JA |
3168 | if (req->flags & REQ_F_BUFFER_SELECT) { |
3169 | ret = io_iov_buffer_select(req, *iovec, needs_lock); | |
847595de PB |
3170 | if (!ret) |
3171 | iov_iter_init(iter, rw, *iovec, 1, (*iovec)->iov_len); | |
4d954c25 JA |
3172 | *iovec = NULL; |
3173 | return ret; | |
3174 | } | |
3175 | ||
89cd35c5 CH |
3176 | return __import_iovec(rw, buf, sqe_len, UIO_FASTIOV, iovec, iter, |
3177 | req->ctx->compat); | |
2b188cc1 JA |
3178 | } |
3179 | ||
0fef9483 JA |
3180 | static inline loff_t *io_kiocb_ppos(struct kiocb *kiocb) |
3181 | { | |
5b09e37e | 3182 | return (kiocb->ki_filp->f_mode & FMODE_STREAM) ? NULL : &kiocb->ki_pos; |
0fef9483 JA |
3183 | } |
3184 | ||
31b51510 | 3185 | /* |
32960613 JA |
3186 | * For files that don't have ->read_iter() and ->write_iter(), handle them |
3187 | * by looping over ->read() or ->write() manually. | |
31b51510 | 3188 | */ |
4017eb91 | 3189 | static ssize_t loop_rw_iter(int rw, struct io_kiocb *req, struct iov_iter *iter) |
32960613 | 3190 | { |
4017eb91 JA |
3191 | struct kiocb *kiocb = &req->rw.kiocb; |
3192 | struct file *file = req->file; | |
32960613 JA |
3193 | ssize_t ret = 0; |
3194 | ||
3195 | /* | |
3196 | * Don't support polled IO through this interface, and we can't | |
3197 | * support non-blocking either. For the latter, this just causes | |
3198 | * the kiocb to be handled from an async context. | |
3199 | */ | |
3200 | if (kiocb->ki_flags & IOCB_HIPRI) | |
3201 | return -EOPNOTSUPP; | |
3202 | if (kiocb->ki_flags & IOCB_NOWAIT) | |
3203 | return -EAGAIN; | |
3204 | ||
3205 | while (iov_iter_count(iter)) { | |
311ae9e1 | 3206 | struct iovec iovec; |
32960613 JA |
3207 | ssize_t nr; |
3208 | ||
311ae9e1 PB |
3209 | if (!iov_iter_is_bvec(iter)) { |
3210 | iovec = iov_iter_iovec(iter); | |
3211 | } else { | |
4017eb91 JA |
3212 | iovec.iov_base = u64_to_user_ptr(req->rw.addr); |
3213 | iovec.iov_len = req->rw.len; | |
311ae9e1 PB |
3214 | } |
3215 | ||
32960613 JA |
3216 | if (rw == READ) { |
3217 | nr = file->f_op->read(file, iovec.iov_base, | |
0fef9483 | 3218 | iovec.iov_len, io_kiocb_ppos(kiocb)); |
32960613 JA |
3219 | } else { |
3220 | nr = file->f_op->write(file, iovec.iov_base, | |
0fef9483 | 3221 | iovec.iov_len, io_kiocb_ppos(kiocb)); |
32960613 JA |
3222 | } |
3223 | ||
3224 | if (nr < 0) { | |
3225 | if (!ret) | |
3226 | ret = nr; | |
3227 | break; | |
3228 | } | |
3229 | ret += nr; | |
3230 | if (nr != iovec.iov_len) | |
3231 | break; | |
4017eb91 JA |
3232 | req->rw.len -= nr; |
3233 | req->rw.addr += nr; | |
32960613 JA |
3234 | iov_iter_advance(iter, nr); |
3235 | } | |
3236 | ||
3237 | return ret; | |
3238 | } | |
3239 | ||
ff6165b2 JA |
3240 | static void io_req_map_rw(struct io_kiocb *req, const struct iovec *iovec, |
3241 | const struct iovec *fast_iov, struct iov_iter *iter) | |
f67676d1 | 3242 | { |
e8c2bc1f | 3243 | struct io_async_rw *rw = req->async_data; |
b64e3444 | 3244 | |
ff6165b2 | 3245 | memcpy(&rw->iter, iter, sizeof(*iter)); |
afb87658 | 3246 | rw->free_iovec = iovec; |
227c0c96 | 3247 | rw->bytes_done = 0; |
ff6165b2 | 3248 | /* can only be fixed buffers, no need to do anything */ |
9c3a205c | 3249 | if (iov_iter_is_bvec(iter)) |
ff6165b2 | 3250 | return; |
b64e3444 | 3251 | if (!iovec) { |
ff6165b2 JA |
3252 | unsigned iov_off = 0; |
3253 | ||
3254 | rw->iter.iov = rw->fast_iov; | |
3255 | if (iter->iov != fast_iov) { | |
3256 | iov_off = iter->iov - fast_iov; | |
3257 | rw->iter.iov += iov_off; | |
3258 | } | |
3259 | if (rw->fast_iov != fast_iov) | |
3260 | memcpy(rw->fast_iov + iov_off, fast_iov + iov_off, | |
45097dae | 3261 | sizeof(struct iovec) * iter->nr_segs); |
99bc4c38 PB |
3262 | } else { |
3263 | req->flags |= REQ_F_NEED_CLEANUP; | |
f67676d1 JA |
3264 | } |
3265 | } | |
3266 | ||
6cb78689 | 3267 | static inline int io_alloc_async_data(struct io_kiocb *req) |
3d9932a8 | 3268 | { |
e8c2bc1f JA |
3269 | WARN_ON_ONCE(!io_op_defs[req->opcode].async_size); |
3270 | req->async_data = kmalloc(io_op_defs[req->opcode].async_size, GFP_KERNEL); | |
3271 | return req->async_data == NULL; | |
3d9932a8 XW |
3272 | } |
3273 | ||
ff6165b2 JA |
3274 | static int io_setup_async_rw(struct io_kiocb *req, const struct iovec *iovec, |
3275 | const struct iovec *fast_iov, | |
227c0c96 | 3276 | struct iov_iter *iter, bool force) |
b7bb4f7d | 3277 | { |
26f0505a | 3278 | if (!force && !io_op_defs[req->opcode].needs_async_setup) |
74566df3 | 3279 | return 0; |
e8c2bc1f | 3280 | if (!req->async_data) { |
6cb78689 | 3281 | if (io_alloc_async_data(req)) { |
6bf985dc | 3282 | kfree(iovec); |
5d204bcf | 3283 | return -ENOMEM; |
6bf985dc | 3284 | } |
b7bb4f7d | 3285 | |
ff6165b2 | 3286 | io_req_map_rw(req, iovec, fast_iov, iter); |
5d204bcf | 3287 | } |
b7bb4f7d | 3288 | return 0; |
f67676d1 JA |
3289 | } |
3290 | ||
73debe68 | 3291 | static inline int io_rw_prep_async(struct io_kiocb *req, int rw) |
c3e330a4 | 3292 | { |
e8c2bc1f | 3293 | struct io_async_rw *iorw = req->async_data; |
f4bff104 | 3294 | struct iovec *iov = iorw->fast_iov; |
847595de | 3295 | int ret; |
c3e330a4 | 3296 | |
2846c481 | 3297 | ret = io_import_iovec(rw, req, &iov, &iorw->iter, false); |
c3e330a4 PB |
3298 | if (unlikely(ret < 0)) |
3299 | return ret; | |
3300 | ||
ab0b196c PB |
3301 | iorw->bytes_done = 0; |
3302 | iorw->free_iovec = iov; | |
3303 | if (iov) | |
3304 | req->flags |= REQ_F_NEED_CLEANUP; | |
c3e330a4 PB |
3305 | return 0; |
3306 | } | |
3307 | ||
73debe68 | 3308 | static int io_read_prep(struct io_kiocb *req, const struct io_uring_sqe *sqe) |
f67676d1 | 3309 | { |
3529d8c2 JA |
3310 | if (unlikely(!(req->file->f_mode & FMODE_READ))) |
3311 | return -EBADF; | |
93642ef8 | 3312 | return io_prep_rw(req, sqe); |
f67676d1 JA |
3313 | } |
3314 | ||
c1dd91d1 JA |
3315 | /* |
3316 | * This is our waitqueue callback handler, registered through lock_page_async() | |
3317 | * when we initially tried to do the IO with the iocb armed our waitqueue. | |
3318 | * This gets called when the page is unlocked, and we generally expect that to | |
3319 | * happen when the page IO is completed and the page is now uptodate. This will | |
3320 | * queue a task_work based retry of the operation, attempting to copy the data | |
3321 | * again. If the latter fails because the page was NOT uptodate, then we will | |
3322 | * do a thread based blocking retry of the operation. That's the unexpected | |
3323 | * slow path. | |
3324 | */ | |
bcf5a063 JA |
3325 | static int io_async_buf_func(struct wait_queue_entry *wait, unsigned mode, |
3326 | int sync, void *arg) | |
3327 | { | |
3328 | struct wait_page_queue *wpq; | |
3329 | struct io_kiocb *req = wait->private; | |
bcf5a063 | 3330 | struct wait_page_key *key = arg; |
bcf5a063 JA |
3331 | |
3332 | wpq = container_of(wait, struct wait_page_queue, wait); | |
3333 | ||
cdc8fcb4 LT |
3334 | if (!wake_page_match(wpq, key)) |
3335 | return 0; | |
3336 | ||
c8d317aa | 3337 | req->rw.kiocb.ki_flags &= ~IOCB_WAITQ; |
bcf5a063 | 3338 | list_del_init(&wait->entry); |
921b9054 | 3339 | io_req_task_queue(req); |
bcf5a063 JA |
3340 | return 1; |
3341 | } | |
3342 | ||
c1dd91d1 JA |
3343 | /* |
3344 | * This controls whether a given IO request should be armed for async page | |
3345 | * based retry. If we return false here, the request is handed to the async | |
3346 | * worker threads for retry. If we're doing buffered reads on a regular file, | |
3347 | * we prepare a private wait_page_queue entry and retry the operation. This | |
3348 | * will either succeed because the page is now uptodate and unlocked, or it | |
3349 | * will register a callback when the page is unlocked at IO completion. Through | |
3350 | * that callback, io_uring uses task_work to setup a retry of the operation. | |
3351 | * That retry will attempt the buffered read again. The retry will generally | |
3352 | * succeed, or in rare cases where it fails, we then fall back to using the | |
3353 | * async worker threads for a blocking retry. | |
3354 | */ | |
227c0c96 | 3355 | static bool io_rw_should_retry(struct io_kiocb *req) |
f67676d1 | 3356 | { |
e8c2bc1f JA |
3357 | struct io_async_rw *rw = req->async_data; |
3358 | struct wait_page_queue *wait = &rw->wpq; | |
bcf5a063 | 3359 | struct kiocb *kiocb = &req->rw.kiocb; |
f67676d1 | 3360 | |
bcf5a063 JA |
3361 | /* never retry for NOWAIT, we just complete with -EAGAIN */ |
3362 | if (req->flags & REQ_F_NOWAIT) | |
3363 | return false; | |
f67676d1 | 3364 | |
227c0c96 | 3365 | /* Only for buffered IO */ |
3b2a4439 | 3366 | if (kiocb->ki_flags & (IOCB_DIRECT | IOCB_HIPRI)) |
bcf5a063 | 3367 | return false; |
3b2a4439 | 3368 | |
bcf5a063 JA |
3369 | /* |
3370 | * just use poll if we can, and don't attempt if the fs doesn't | |
3371 | * support callback based unlocks | |
3372 | */ | |
3373 | if (file_can_poll(req->file) || !(req->file->f_mode & FMODE_BUF_RASYNC)) | |
3374 | return false; | |
f67676d1 | 3375 | |
3b2a4439 JA |
3376 | wait->wait.func = io_async_buf_func; |
3377 | wait->wait.private = req; | |
3378 | wait->wait.flags = 0; | |
3379 | INIT_LIST_HEAD(&wait->wait.entry); | |
3380 | kiocb->ki_flags |= IOCB_WAITQ; | |
c8d317aa | 3381 | kiocb->ki_flags &= ~IOCB_NOWAIT; |
3b2a4439 | 3382 | kiocb->ki_waitq = wait; |
3b2a4439 | 3383 | return true; |
bcf5a063 JA |
3384 | } |
3385 | ||
aeab9506 | 3386 | static inline int io_iter_do_read(struct io_kiocb *req, struct iov_iter *iter) |
bcf5a063 JA |
3387 | { |
3388 | if (req->file->f_op->read_iter) | |
3389 | return call_read_iter(req->file, &req->rw.kiocb, iter); | |
2dd2111d | 3390 | else if (req->file->f_op->read) |
4017eb91 | 3391 | return loop_rw_iter(READ, req, iter); |
2dd2111d GH |
3392 | else |
3393 | return -EINVAL; | |
f67676d1 JA |
3394 | } |
3395 | ||
7db30437 ML |
3396 | static bool need_read_all(struct io_kiocb *req) |
3397 | { | |
3398 | return req->flags & REQ_F_ISREG || | |
3399 | S_ISBLK(file_inode(req->file)->i_mode); | |
3400 | } | |
3401 | ||
889fca73 | 3402 | static int io_read(struct io_kiocb *req, unsigned int issue_flags) |
2b188cc1 JA |
3403 | { |
3404 | struct iovec inline_vecs[UIO_FASTIOV], *iovec = inline_vecs; | |
9adbd45d | 3405 | struct kiocb *kiocb = &req->rw.kiocb; |
ff6165b2 | 3406 | struct iov_iter __iter, *iter = &__iter; |
e8c2bc1f | 3407 | struct io_async_rw *rw = req->async_data; |
227c0c96 | 3408 | ssize_t io_size, ret, ret2; |
45d189c6 | 3409 | bool force_nonblock = issue_flags & IO_URING_F_NONBLOCK; |
ff6165b2 | 3410 | |
2846c481 | 3411 | if (rw) { |
e8c2bc1f | 3412 | iter = &rw->iter; |
2846c481 PB |
3413 | iovec = NULL; |
3414 | } else { | |
3415 | ret = io_import_iovec(READ, req, &iovec, iter, !force_nonblock); | |
3416 | if (ret < 0) | |
3417 | return ret; | |
3418 | } | |
632546c4 | 3419 | io_size = iov_iter_count(iter); |
fa15bafb | 3420 | req->result = io_size; |
2b188cc1 | 3421 | |
fd6c2e4c JA |
3422 | /* Ensure we clear previously set non-block flag */ |
3423 | if (!force_nonblock) | |
29de5f6a | 3424 | kiocb->ki_flags &= ~IOCB_NOWAIT; |
a88fc400 PB |
3425 | else |
3426 | kiocb->ki_flags |= IOCB_NOWAIT; | |
3427 | ||
24c74678 | 3428 | /* If the file doesn't support async, just async punt */ |
b191e2df | 3429 | if (force_nonblock && !io_file_supports_nowait(req, READ)) { |
6713e7a6 | 3430 | ret = io_setup_async_rw(req, iovec, inline_vecs, iter, true); |
6bf985dc | 3431 | return ret ?: -EAGAIN; |
6713e7a6 | 3432 | } |
9e645e11 | 3433 | |
632546c4 | 3434 | ret = rw_verify_area(READ, req->file, io_kiocb_ppos(kiocb), io_size); |
5ea5dd45 PB |
3435 | if (unlikely(ret)) { |
3436 | kfree(iovec); | |
3437 | return ret; | |
3438 | } | |
2b188cc1 | 3439 | |
227c0c96 | 3440 | ret = io_iter_do_read(req, iter); |
32960613 | 3441 | |
230d50d4 | 3442 | if (ret == -EAGAIN || (req->flags & REQ_F_REISSUE)) { |
6ad7f233 | 3443 | req->flags &= ~REQ_F_REISSUE; |
eefdf30f JA |
3444 | /* IOPOLL retry should happen for io-wq threads */ |
3445 | if (!force_nonblock && !(req->ctx->flags & IORING_SETUP_IOPOLL)) | |
f91daf56 | 3446 | goto done; |
75c668cd PB |
3447 | /* no retry on NONBLOCK nor RWF_NOWAIT */ |
3448 | if (req->flags & REQ_F_NOWAIT) | |
355afaeb | 3449 | goto done; |
84216315 | 3450 | /* some cases will consume bytes even on error returns */ |
632546c4 | 3451 | iov_iter_revert(iter, io_size - iov_iter_count(iter)); |
f38c7e3a | 3452 | ret = 0; |
230d50d4 JA |
3453 | } else if (ret == -EIOCBQUEUED) { |
3454 | goto out_free; | |
7335e3bf | 3455 | } else if (ret <= 0 || ret == io_size || !force_nonblock || |
7db30437 | 3456 | (req->flags & REQ_F_NOWAIT) || !need_read_all(req)) { |
7335e3bf | 3457 | /* read all, failed, already did sync or don't want to retry */ |
00d23d51 | 3458 | goto done; |
227c0c96 JA |
3459 | } |
3460 | ||
227c0c96 | 3461 | ret2 = io_setup_async_rw(req, iovec, inline_vecs, iter, true); |
6bf985dc PB |
3462 | if (ret2) |
3463 | return ret2; | |
3464 | ||
fe1cdd55 | 3465 | iovec = NULL; |
e8c2bc1f | 3466 | rw = req->async_data; |
227c0c96 | 3467 | /* now use our persistent iterator, if we aren't already */ |
e8c2bc1f | 3468 | iter = &rw->iter; |
227c0c96 | 3469 | |
b23df91b PB |
3470 | do { |
3471 | io_size -= ret; | |
3472 | rw->bytes_done += ret; | |
3473 | /* if we can retry, do so with the callbacks armed */ | |
3474 | if (!io_rw_should_retry(req)) { | |
3475 | kiocb->ki_flags &= ~IOCB_WAITQ; | |
3476 | return -EAGAIN; | |
3477 | } | |
3478 | ||
3479 | /* | |
3480 | * Now retry read with the IOCB_WAITQ parts set in the iocb. If | |
3481 | * we get -EIOCBQUEUED, then we'll get a notification when the | |
3482 | * desired page gets unlocked. We can also get a partial read | |
3483 | * here, and if we do, then just retry at the new offset. | |
3484 | */ | |
3485 | ret = io_iter_do_read(req, iter); | |
3486 | if (ret == -EIOCBQUEUED) | |
3487 | return 0; | |
227c0c96 | 3488 | /* we got some bytes, but not all. retry. */ |
b5b0ecb7 | 3489 | kiocb->ki_flags &= ~IOCB_WAITQ; |
b23df91b | 3490 | } while (ret > 0 && ret < io_size); |
227c0c96 | 3491 | done: |
889fca73 | 3492 | kiocb_done(kiocb, ret, issue_flags); |
fe1cdd55 PB |
3493 | out_free: |
3494 | /* it's faster to check here then delegate to kfree */ | |
3495 | if (iovec) | |
3496 | kfree(iovec); | |
5ea5dd45 | 3497 | return 0; |
2b188cc1 JA |
3498 | } |
3499 | ||
73debe68 | 3500 | static int io_write_prep(struct io_kiocb *req, const struct io_uring_sqe *sqe) |
f67676d1 | 3501 | { |
3529d8c2 JA |
3502 | if (unlikely(!(req->file->f_mode & FMODE_WRITE))) |
3503 | return -EBADF; | |
93642ef8 | 3504 | return io_prep_rw(req, sqe); |
f67676d1 JA |
3505 | } |
3506 | ||
889fca73 | 3507 | static int io_write(struct io_kiocb *req, unsigned int issue_flags) |
2b188cc1 JA |
3508 | { |
3509 | struct iovec inline_vecs[UIO_FASTIOV], *iovec = inline_vecs; | |
9adbd45d | 3510 | struct kiocb *kiocb = &req->rw.kiocb; |
ff6165b2 | 3511 | struct iov_iter __iter, *iter = &__iter; |
e8c2bc1f | 3512 | struct io_async_rw *rw = req->async_data; |
fa15bafb | 3513 | ssize_t ret, ret2, io_size; |
45d189c6 | 3514 | bool force_nonblock = issue_flags & IO_URING_F_NONBLOCK; |
2b188cc1 | 3515 | |
2846c481 | 3516 | if (rw) { |
e8c2bc1f | 3517 | iter = &rw->iter; |
2846c481 PB |
3518 | iovec = NULL; |
3519 | } else { | |
3520 | ret = io_import_iovec(WRITE, req, &iovec, iter, !force_nonblock); | |
3521 | if (ret < 0) | |
3522 | return ret; | |
3523 | } | |
632546c4 | 3524 | io_size = iov_iter_count(iter); |
fa15bafb | 3525 | req->result = io_size; |
2b188cc1 | 3526 | |
fd6c2e4c JA |
3527 | /* Ensure we clear previously set non-block flag */ |
3528 | if (!force_nonblock) | |
a88fc400 PB |
3529 | kiocb->ki_flags &= ~IOCB_NOWAIT; |
3530 | else | |
3531 | kiocb->ki_flags |= IOCB_NOWAIT; | |
fd6c2e4c | 3532 | |
24c74678 | 3533 | /* If the file doesn't support async, just async punt */ |
b191e2df | 3534 | if (force_nonblock && !io_file_supports_nowait(req, WRITE)) |
f67676d1 | 3535 | goto copy_iov; |
31b51510 | 3536 | |
10d59345 JA |
3537 | /* file path doesn't support NOWAIT for non-direct_IO */ |
3538 | if (force_nonblock && !(kiocb->ki_flags & IOCB_DIRECT) && | |
3539 | (req->flags & REQ_F_ISREG)) | |
f67676d1 | 3540 | goto copy_iov; |
31b51510 | 3541 | |
632546c4 | 3542 | ret = rw_verify_area(WRITE, req->file, io_kiocb_ppos(kiocb), io_size); |
fa15bafb PB |
3543 | if (unlikely(ret)) |
3544 | goto out_free; | |
4ed734b0 | 3545 | |
fa15bafb PB |
3546 | /* |
3547 | * Open-code file_start_write here to grab freeze protection, | |
3548 | * which will be released by another thread in | |
3549 | * io_complete_rw(). Fool lockdep by telling it the lock got | |
3550 | * released so that it doesn't complain about the held lock when | |
3551 | * we return to userspace. | |
3552 | */ | |
3553 | if (req->flags & REQ_F_ISREG) { | |
8a3c84b6 | 3554 | sb_start_write(file_inode(req->file)->i_sb); |
fa15bafb PB |
3555 | __sb_writers_release(file_inode(req->file)->i_sb, |
3556 | SB_FREEZE_WRITE); | |
3557 | } | |
3558 | kiocb->ki_flags |= IOCB_WRITE; | |
4ed734b0 | 3559 | |
fa15bafb | 3560 | if (req->file->f_op->write_iter) |
ff6165b2 | 3561 | ret2 = call_write_iter(req->file, kiocb, iter); |
2dd2111d | 3562 | else if (req->file->f_op->write) |
4017eb91 | 3563 | ret2 = loop_rw_iter(WRITE, req, iter); |
2dd2111d GH |
3564 | else |
3565 | ret2 = -EINVAL; | |
4ed734b0 | 3566 | |
6ad7f233 PB |
3567 | if (req->flags & REQ_F_REISSUE) { |
3568 | req->flags &= ~REQ_F_REISSUE; | |
230d50d4 | 3569 | ret2 = -EAGAIN; |
6ad7f233 | 3570 | } |
230d50d4 | 3571 | |
fa15bafb PB |
3572 | /* |
3573 | * Raw bdev writes will return -EOPNOTSUPP for IOCB_NOWAIT. Just | |
3574 | * retry them without IOCB_NOWAIT. | |
3575 | */ | |
3576 | if (ret2 == -EOPNOTSUPP && (kiocb->ki_flags & IOCB_NOWAIT)) | |
3577 | ret2 = -EAGAIN; | |
75c668cd PB |
3578 | /* no retry on NONBLOCK nor RWF_NOWAIT */ |
3579 | if (ret2 == -EAGAIN && (req->flags & REQ_F_NOWAIT)) | |
355afaeb | 3580 | goto done; |
fa15bafb | 3581 | if (!force_nonblock || ret2 != -EAGAIN) { |
eefdf30f JA |
3582 | /* IOPOLL retry should happen for io-wq threads */ |
3583 | if ((req->ctx->flags & IORING_SETUP_IOPOLL) && ret2 == -EAGAIN) | |
3584 | goto copy_iov; | |
355afaeb | 3585 | done: |
889fca73 | 3586 | kiocb_done(kiocb, ret2, issue_flags); |
fa15bafb | 3587 | } else { |
f67676d1 | 3588 | copy_iov: |
84216315 | 3589 | /* some cases will consume bytes even on error returns */ |
632546c4 | 3590 | iov_iter_revert(iter, io_size - iov_iter_count(iter)); |
227c0c96 | 3591 | ret = io_setup_async_rw(req, iovec, inline_vecs, iter, false); |
6bf985dc | 3592 | return ret ?: -EAGAIN; |
2b188cc1 | 3593 | } |
31b51510 | 3594 | out_free: |
f261c168 | 3595 | /* it's reportedly faster than delegating the null check to kfree() */ |
252917c3 | 3596 | if (iovec) |
6f2cc166 | 3597 | kfree(iovec); |
2b188cc1 JA |
3598 | return ret; |
3599 | } | |
3600 | ||
80a261fd JA |
3601 | static int io_renameat_prep(struct io_kiocb *req, |
3602 | const struct io_uring_sqe *sqe) | |
3603 | { | |
3604 | struct io_rename *ren = &req->rename; | |
3605 | const char __user *oldf, *newf; | |
3606 | ||
ed7eb259 JA |
3607 | if (unlikely(req->ctx->flags & IORING_SETUP_IOPOLL)) |
3608 | return -EINVAL; | |
26578cda | 3609 | if (sqe->ioprio || sqe->buf_index || sqe->splice_fd_in) |
ed7eb259 | 3610 | return -EINVAL; |
80a261fd JA |
3611 | if (unlikely(req->flags & REQ_F_FIXED_FILE)) |
3612 | return -EBADF; | |
3613 | ||
3614 | ren->old_dfd = READ_ONCE(sqe->fd); | |
3615 | oldf = u64_to_user_ptr(READ_ONCE(sqe->addr)); | |
3616 | newf = u64_to_user_ptr(READ_ONCE(sqe->addr2)); | |
3617 | ren->new_dfd = READ_ONCE(sqe->len); | |
3618 | ren->flags = READ_ONCE(sqe->rename_flags); | |
3619 | ||
3620 | ren->oldpath = getname(oldf); | |
3621 | if (IS_ERR(ren->oldpath)) | |
3622 | return PTR_ERR(ren->oldpath); | |
3623 | ||
3624 | ren->newpath = getname(newf); | |
3625 | if (IS_ERR(ren->newpath)) { | |
3626 | putname(ren->oldpath); | |
3627 | return PTR_ERR(ren->newpath); | |
3628 | } | |
3629 | ||
3630 | req->flags |= REQ_F_NEED_CLEANUP; | |
3631 | return 0; | |
3632 | } | |
3633 | ||
45d189c6 | 3634 | static int io_renameat(struct io_kiocb *req, unsigned int issue_flags) |
80a261fd JA |
3635 | { |
3636 | struct io_rename *ren = &req->rename; | |
3637 | int ret; | |
3638 | ||
45d189c6 | 3639 | if (issue_flags & IO_URING_F_NONBLOCK) |
80a261fd JA |
3640 | return -EAGAIN; |
3641 | ||
3642 | ret = do_renameat2(ren->old_dfd, ren->oldpath, ren->new_dfd, | |
3643 | ren->newpath, ren->flags); | |
3644 | ||
3645 | req->flags &= ~REQ_F_NEED_CLEANUP; | |
3646 | if (ret < 0) | |
93d2bcd2 | 3647 | req_set_fail(req); |
80a261fd JA |
3648 | io_req_complete(req, ret); |
3649 | return 0; | |
3650 | } | |
3651 | ||
14a1143b JA |
3652 | static int io_unlinkat_prep(struct io_kiocb *req, |
3653 | const struct io_uring_sqe *sqe) | |
3654 | { | |
3655 | struct io_unlink *un = &req->unlink; | |
3656 | const char __user *fname; | |
3657 | ||
22634bc5 JA |
3658 | if (unlikely(req->ctx->flags & IORING_SETUP_IOPOLL)) |
3659 | return -EINVAL; | |
26578cda PB |
3660 | if (sqe->ioprio || sqe->off || sqe->len || sqe->buf_index || |
3661 | sqe->splice_fd_in) | |
22634bc5 | 3662 | return -EINVAL; |
14a1143b JA |
3663 | if (unlikely(req->flags & REQ_F_FIXED_FILE)) |
3664 | return -EBADF; | |
3665 | ||
3666 | un->dfd = READ_ONCE(sqe->fd); | |
3667 | ||
3668 | un->flags = READ_ONCE(sqe->unlink_flags); | |
3669 | if (un->flags & ~AT_REMOVEDIR) | |
3670 | return -EINVAL; | |
3671 | ||
3672 | fname = u64_to_user_ptr(READ_ONCE(sqe->addr)); | |
3673 | un->filename = getname(fname); | |
3674 | if (IS_ERR(un->filename)) | |
3675 | return PTR_ERR(un->filename); | |
3676 | ||
3677 | req->flags |= REQ_F_NEED_CLEANUP; | |
3678 | return 0; | |
3679 | } | |
3680 | ||
45d189c6 | 3681 | static int io_unlinkat(struct io_kiocb *req, unsigned int issue_flags) |
14a1143b JA |
3682 | { |
3683 | struct io_unlink *un = &req->unlink; | |
3684 | int ret; | |
3685 | ||
45d189c6 | 3686 | if (issue_flags & IO_URING_F_NONBLOCK) |
14a1143b JA |
3687 | return -EAGAIN; |
3688 | ||
3689 | if (un->flags & AT_REMOVEDIR) | |
3690 | ret = do_rmdir(un->dfd, un->filename); | |
3691 | else | |
3692 | ret = do_unlinkat(un->dfd, un->filename); | |
3693 | ||
3694 | req->flags &= ~REQ_F_NEED_CLEANUP; | |
3695 | if (ret < 0) | |
93d2bcd2 | 3696 | req_set_fail(req); |
14a1143b JA |
3697 | io_req_complete(req, ret); |
3698 | return 0; | |
3699 | } | |
3700 | ||
36f4fa68 JA |
3701 | static int io_shutdown_prep(struct io_kiocb *req, |
3702 | const struct io_uring_sqe *sqe) | |
3703 | { | |
3704 | #if defined(CONFIG_NET) | |
3705 | if (unlikely(req->ctx->flags & IORING_SETUP_IOPOLL)) | |
3706 | return -EINVAL; | |
26578cda PB |
3707 | if (unlikely(sqe->ioprio || sqe->off || sqe->addr || sqe->rw_flags || |
3708 | sqe->buf_index || sqe->splice_fd_in)) | |
36f4fa68 JA |
3709 | return -EINVAL; |
3710 | ||
3711 | req->shutdown.how = READ_ONCE(sqe->len); | |
3712 | return 0; | |
3713 | #else | |
3714 | return -EOPNOTSUPP; | |
3715 | #endif | |
3716 | } | |
3717 | ||
45d189c6 | 3718 | static int io_shutdown(struct io_kiocb *req, unsigned int issue_flags) |
36f4fa68 JA |
3719 | { |
3720 | #if defined(CONFIG_NET) | |
3721 | struct socket *sock; | |
3722 | int ret; | |
3723 | ||
45d189c6 | 3724 | if (issue_flags & IO_URING_F_NONBLOCK) |
36f4fa68 JA |
3725 | return -EAGAIN; |
3726 | ||
48aba79b | 3727 | sock = sock_from_file(req->file); |
36f4fa68 | 3728 | if (unlikely(!sock)) |
48aba79b | 3729 | return -ENOTSOCK; |
36f4fa68 JA |
3730 | |
3731 | ret = __sys_shutdown_sock(sock, req->shutdown.how); | |
a146468d | 3732 | if (ret < 0) |
93d2bcd2 | 3733 | req_set_fail(req); |
36f4fa68 JA |
3734 | io_req_complete(req, ret); |
3735 | return 0; | |
3736 | #else | |
3737 | return -EOPNOTSUPP; | |
3738 | #endif | |
3739 | } | |
3740 | ||
f2a8d5c7 PB |
3741 | static int __io_splice_prep(struct io_kiocb *req, |
3742 | const struct io_uring_sqe *sqe) | |
7d67af2c | 3743 | { |
fe7e3257 | 3744 | struct io_splice *sp = &req->splice; |
7d67af2c | 3745 | unsigned int valid_flags = SPLICE_F_FD_IN_FIXED | SPLICE_F_ALL; |
7d67af2c | 3746 | |
3232dd02 PB |
3747 | if (unlikely(req->ctx->flags & IORING_SETUP_IOPOLL)) |
3748 | return -EINVAL; | |
7d67af2c PB |
3749 | |
3750 | sp->file_in = NULL; | |
7d67af2c PB |
3751 | sp->len = READ_ONCE(sqe->len); |
3752 | sp->flags = READ_ONCE(sqe->splice_flags); | |
3753 | ||
3754 | if (unlikely(sp->flags & ~valid_flags)) | |
3755 | return -EINVAL; | |
3756 | ||
62906e89 | 3757 | sp->file_in = io_file_get(req->ctx, req, READ_ONCE(sqe->splice_fd_in), |
8371adf5 PB |
3758 | (sp->flags & SPLICE_F_FD_IN_FIXED)); |
3759 | if (!sp->file_in) | |
3760 | return -EBADF; | |
7d67af2c | 3761 | req->flags |= REQ_F_NEED_CLEANUP; |
7d67af2c PB |
3762 | return 0; |
3763 | } | |
3764 | ||
f2a8d5c7 PB |
3765 | static int io_tee_prep(struct io_kiocb *req, |
3766 | const struct io_uring_sqe *sqe) | |
3767 | { | |
3768 | if (READ_ONCE(sqe->splice_off_in) || READ_ONCE(sqe->off)) | |
3769 | return -EINVAL; | |
3770 | return __io_splice_prep(req, sqe); | |
3771 | } | |
3772 | ||
45d189c6 | 3773 | static int io_tee(struct io_kiocb *req, unsigned int issue_flags) |
f2a8d5c7 PB |
3774 | { |
3775 | struct io_splice *sp = &req->splice; | |
3776 | struct file *in = sp->file_in; | |
3777 | struct file *out = sp->file_out; | |
3778 | unsigned int flags = sp->flags & ~SPLICE_F_FD_IN_FIXED; | |
3779 | long ret = 0; | |
3780 | ||
45d189c6 | 3781 | if (issue_flags & IO_URING_F_NONBLOCK) |
f2a8d5c7 PB |
3782 | return -EAGAIN; |
3783 | if (sp->len) | |
3784 | ret = do_tee(in, out, sp->len, flags); | |
3785 | ||
e1d767f0 PB |
3786 | if (!(sp->flags & SPLICE_F_FD_IN_FIXED)) |
3787 | io_put_file(in); | |
f2a8d5c7 PB |
3788 | req->flags &= ~REQ_F_NEED_CLEANUP; |
3789 | ||
f2a8d5c7 | 3790 | if (ret != sp->len) |
93d2bcd2 | 3791 | req_set_fail(req); |
e1e16097 | 3792 | io_req_complete(req, ret); |
f2a8d5c7 PB |
3793 | return 0; |
3794 | } | |
3795 | ||
3796 | static int io_splice_prep(struct io_kiocb *req, const struct io_uring_sqe *sqe) | |
3797 | { | |
fe7e3257 | 3798 | struct io_splice *sp = &req->splice; |
f2a8d5c7 PB |
3799 | |
3800 | sp->off_in = READ_ONCE(sqe->splice_off_in); | |
3801 | sp->off_out = READ_ONCE(sqe->off); | |
3802 | return __io_splice_prep(req, sqe); | |
3803 | } | |
3804 | ||
45d189c6 | 3805 | static int io_splice(struct io_kiocb *req, unsigned int issue_flags) |
7d67af2c PB |
3806 | { |
3807 | struct io_splice *sp = &req->splice; | |
3808 | struct file *in = sp->file_in; | |
3809 | struct file *out = sp->file_out; | |
3810 | unsigned int flags = sp->flags & ~SPLICE_F_FD_IN_FIXED; | |
3811 | loff_t *poff_in, *poff_out; | |
c9687426 | 3812 | long ret = 0; |
7d67af2c | 3813 | |
45d189c6 | 3814 | if (issue_flags & IO_URING_F_NONBLOCK) |
2fb3e822 | 3815 | return -EAGAIN; |
7d67af2c PB |
3816 | |
3817 | poff_in = (sp->off_in == -1) ? NULL : &sp->off_in; | |
3818 | poff_out = (sp->off_out == -1) ? NULL : &sp->off_out; | |
c9687426 | 3819 | |
948a7749 | 3820 | if (sp->len) |
c9687426 | 3821 | ret = do_splice(in, poff_in, out, poff_out, sp->len, flags); |
7d67af2c | 3822 | |
e1d767f0 PB |
3823 | if (!(sp->flags & SPLICE_F_FD_IN_FIXED)) |
3824 | io_put_file(in); | |
7d67af2c PB |
3825 | req->flags &= ~REQ_F_NEED_CLEANUP; |
3826 | ||
7d67af2c | 3827 | if (ret != sp->len) |
93d2bcd2 | 3828 | req_set_fail(req); |
e1e16097 | 3829 | io_req_complete(req, ret); |
7d67af2c PB |
3830 | return 0; |
3831 | } | |
3832 | ||
2b188cc1 JA |
3833 | /* |
3834 | * IORING_OP_NOP just posts a completion event, nothing else. | |
3835 | */ | |
889fca73 | 3836 | static int io_nop(struct io_kiocb *req, unsigned int issue_flags) |
2b188cc1 JA |
3837 | { |
3838 | struct io_ring_ctx *ctx = req->ctx; | |
2b188cc1 | 3839 | |
def596e9 JA |
3840 | if (unlikely(ctx->flags & IORING_SETUP_IOPOLL)) |
3841 | return -EINVAL; | |
3842 | ||
889fca73 | 3843 | __io_req_complete(req, issue_flags, 0, 0); |
2b188cc1 JA |
3844 | return 0; |
3845 | } | |
3846 | ||
1155c76a | 3847 | static int io_fsync_prep(struct io_kiocb *req, const struct io_uring_sqe *sqe) |
c992fe29 | 3848 | { |
6b06314c | 3849 | struct io_ring_ctx *ctx = req->ctx; |
c992fe29 | 3850 | |
09bb8394 JA |
3851 | if (!req->file) |
3852 | return -EBADF; | |
c992fe29 | 3853 | |
6b06314c | 3854 | if (unlikely(ctx->flags & IORING_SETUP_IOPOLL)) |
def596e9 | 3855 | return -EINVAL; |
26578cda PB |
3856 | if (unlikely(sqe->addr || sqe->ioprio || sqe->buf_index || |
3857 | sqe->splice_fd_in)) | |
c992fe29 CH |
3858 | return -EINVAL; |
3859 | ||
8ed8d3c3 JA |
3860 | req->sync.flags = READ_ONCE(sqe->fsync_flags); |
3861 | if (unlikely(req->sync.flags & ~IORING_FSYNC_DATASYNC)) | |
3862 | return -EINVAL; | |
3863 | ||
3864 | req->sync.off = READ_ONCE(sqe->off); | |
3865 | req->sync.len = READ_ONCE(sqe->len); | |
c992fe29 CH |
3866 | return 0; |
3867 | } | |
3868 | ||
45d189c6 | 3869 | static int io_fsync(struct io_kiocb *req, unsigned int issue_flags) |
8ed8d3c3 | 3870 | { |
8ed8d3c3 | 3871 | loff_t end = req->sync.off + req->sync.len; |
8ed8d3c3 JA |
3872 | int ret; |
3873 | ||
ac45abc0 | 3874 | /* fsync always requires a blocking context */ |
45d189c6 | 3875 | if (issue_flags & IO_URING_F_NONBLOCK) |
ac45abc0 PB |
3876 | return -EAGAIN; |
3877 | ||
9adbd45d | 3878 | ret = vfs_fsync_range(req->file, req->sync.off, |
8ed8d3c3 JA |
3879 | end > 0 ? end : LLONG_MAX, |
3880 | req->sync.flags & IORING_FSYNC_DATASYNC); | |
3881 | if (ret < 0) | |
93d2bcd2 | 3882 | req_set_fail(req); |
e1e16097 | 3883 | io_req_complete(req, ret); |
c992fe29 CH |
3884 | return 0; |
3885 | } | |
3886 | ||
d63d1b5e JA |
3887 | static int io_fallocate_prep(struct io_kiocb *req, |
3888 | const struct io_uring_sqe *sqe) | |
3889 | { | |
26578cda PB |
3890 | if (sqe->ioprio || sqe->buf_index || sqe->rw_flags || |
3891 | sqe->splice_fd_in) | |
d63d1b5e | 3892 | return -EINVAL; |
3232dd02 PB |
3893 | if (unlikely(req->ctx->flags & IORING_SETUP_IOPOLL)) |
3894 | return -EINVAL; | |
d63d1b5e JA |
3895 | |
3896 | req->sync.off = READ_ONCE(sqe->off); | |
3897 | req->sync.len = READ_ONCE(sqe->addr); | |
3898 | req->sync.mode = READ_ONCE(sqe->len); | |
3899 | return 0; | |
3900 | } | |
3901 | ||
45d189c6 | 3902 | static int io_fallocate(struct io_kiocb *req, unsigned int issue_flags) |
5d17b4a4 | 3903 | { |
ac45abc0 PB |
3904 | int ret; |
3905 | ||
d63d1b5e | 3906 | /* fallocate always requiring blocking context */ |
45d189c6 | 3907 | if (issue_flags & IO_URING_F_NONBLOCK) |
5d17b4a4 | 3908 | return -EAGAIN; |
ac45abc0 PB |
3909 | ret = vfs_fallocate(req->file, req->sync.mode, req->sync.off, |
3910 | req->sync.len); | |
ac45abc0 | 3911 | if (ret < 0) |
93d2bcd2 | 3912 | req_set_fail(req); |
e1e16097 | 3913 | io_req_complete(req, ret); |
5d17b4a4 JA |
3914 | return 0; |
3915 | } | |
3916 | ||
ec65fea5 | 3917 | static int __io_openat_prep(struct io_kiocb *req, const struct io_uring_sqe *sqe) |
b7bb4f7d | 3918 | { |
f8748881 | 3919 | const char __user *fname; |
15b71abe | 3920 | int ret; |
b7bb4f7d | 3921 | |
d3fddf6d PB |
3922 | if (unlikely(req->ctx->flags & IORING_SETUP_IOPOLL)) |
3923 | return -EINVAL; | |
b9445598 | 3924 | if (unlikely(sqe->ioprio || sqe->buf_index)) |
15b71abe | 3925 | return -EINVAL; |
ec65fea5 | 3926 | if (unlikely(req->flags & REQ_F_FIXED_FILE)) |
cf3040ca | 3927 | return -EBADF; |
03b1230c | 3928 | |
ec65fea5 PB |
3929 | /* open.how should be already initialised */ |
3930 | if (!(req->open.how.flags & O_PATH) && force_o_largefile()) | |
08a1d26e | 3931 | req->open.how.flags |= O_LARGEFILE; |
3529d8c2 | 3932 | |
25e72d10 PB |
3933 | req->open.dfd = READ_ONCE(sqe->fd); |
3934 | fname = u64_to_user_ptr(READ_ONCE(sqe->addr)); | |
f8748881 | 3935 | req->open.filename = getname(fname); |
15b71abe JA |
3936 | if (IS_ERR(req->open.filename)) { |
3937 | ret = PTR_ERR(req->open.filename); | |
3938 | req->open.filename = NULL; | |
3939 | return ret; | |
3940 | } | |
b9445598 PB |
3941 | |
3942 | req->open.file_slot = READ_ONCE(sqe->file_index); | |
3943 | if (req->open.file_slot && (req->open.how.flags & O_CLOEXEC)) | |
3944 | return -EINVAL; | |
3945 | ||
4022e7af | 3946 | req->open.nofile = rlimit(RLIMIT_NOFILE); |
8fef80bf | 3947 | req->flags |= REQ_F_NEED_CLEANUP; |
15b71abe | 3948 | return 0; |
03b1230c JA |
3949 | } |
3950 | ||
ec65fea5 PB |
3951 | static int io_openat_prep(struct io_kiocb *req, const struct io_uring_sqe *sqe) |
3952 | { | |
d3fddf6d PB |
3953 | u64 mode = READ_ONCE(sqe->len); |
3954 | u64 flags = READ_ONCE(sqe->open_flags); | |
ec65fea5 | 3955 | |
ec65fea5 PB |
3956 | req->open.how = build_open_how(flags, mode); |
3957 | return __io_openat_prep(req, sqe); | |
3958 | } | |
3959 | ||
cebdb986 | 3960 | static int io_openat2_prep(struct io_kiocb *req, const struct io_uring_sqe *sqe) |
aa1fa28f | 3961 | { |
cebdb986 | 3962 | struct open_how __user *how; |
cebdb986 | 3963 | size_t len; |
0fa03c62 JA |
3964 | int ret; |
3965 | ||
cebdb986 JA |
3966 | how = u64_to_user_ptr(READ_ONCE(sqe->addr2)); |
3967 | len = READ_ONCE(sqe->len); | |
cebdb986 JA |
3968 | if (len < OPEN_HOW_SIZE_VER0) |
3969 | return -EINVAL; | |
3529d8c2 | 3970 | |
cebdb986 JA |
3971 | ret = copy_struct_from_user(&req->open.how, sizeof(req->open.how), how, |
3972 | len); | |
3973 | if (ret) | |
3974 | return ret; | |
3529d8c2 | 3975 | |
ec65fea5 | 3976 | return __io_openat_prep(req, sqe); |
cebdb986 JA |
3977 | } |
3978 | ||
45d189c6 | 3979 | static int io_openat2(struct io_kiocb *req, unsigned int issue_flags) |
15b71abe JA |
3980 | { |
3981 | struct open_flags op; | |
15b71abe | 3982 | struct file *file; |
b9445598 PB |
3983 | bool resolve_nonblock, nonblock_set; |
3984 | bool fixed = !!req->open.file_slot; | |
15b71abe JA |
3985 | int ret; |
3986 | ||
cebdb986 | 3987 | ret = build_open_flags(&req->open.how, &op); |
15b71abe JA |
3988 | if (ret) |
3989 | goto err; | |
3a81fd02 JA |
3990 | nonblock_set = op.open_flag & O_NONBLOCK; |
3991 | resolve_nonblock = req->open.how.resolve & RESOLVE_CACHED; | |
45d189c6 | 3992 | if (issue_flags & IO_URING_F_NONBLOCK) { |
3a81fd02 JA |
3993 | /* |
3994 | * Don't bother trying for O_TRUNC, O_CREAT, or O_TMPFILE open, | |
3995 | * it'll always -EAGAIN | |
3996 | */ | |
3997 | if (req->open.how.flags & (O_TRUNC | O_CREAT | O_TMPFILE)) | |
3998 | return -EAGAIN; | |
3999 | op.lookup_flags |= LOOKUP_CACHED; | |
4000 | op.open_flag |= O_NONBLOCK; | |
4001 | } | |
15b71abe | 4002 | |
b9445598 PB |
4003 | if (!fixed) { |
4004 | ret = __get_unused_fd_flags(req->open.how.flags, req->open.nofile); | |
4005 | if (ret < 0) | |
4006 | goto err; | |
4007 | } | |
15b71abe JA |
4008 | |
4009 | file = do_filp_open(req->open.dfd, req->open.filename, &op); | |
12dcb58a | 4010 | if (IS_ERR(file)) { |
944d1444 | 4011 | /* |
12dcb58a PB |
4012 | * We could hang on to this 'fd' on retrying, but seems like |
4013 | * marginal gain for something that is now known to be a slower | |
4014 | * path. So just put it, and we'll get a new one when we retry. | |
944d1444 | 4015 | */ |
b9445598 PB |
4016 | if (!fixed) |
4017 | put_unused_fd(ret); | |
3a81fd02 | 4018 | |
15b71abe | 4019 | ret = PTR_ERR(file); |
12dcb58a PB |
4020 | /* only retry if RESOLVE_CACHED wasn't already set by application */ |
4021 | if (ret == -EAGAIN && | |
4022 | (!resolve_nonblock && (issue_flags & IO_URING_F_NONBLOCK))) | |
4023 | return -EAGAIN; | |
4024 | goto err; | |
15b71abe | 4025 | } |
12dcb58a PB |
4026 | |
4027 | if ((issue_flags & IO_URING_F_NONBLOCK) && !nonblock_set) | |
4028 | file->f_flags &= ~O_NONBLOCK; | |
4029 | fsnotify_open(file); | |
b9445598 PB |
4030 | |
4031 | if (!fixed) | |
4032 | fd_install(ret, file); | |
4033 | else | |
4034 | ret = io_install_fixed_file(req, file, issue_flags, | |
4035 | req->open.file_slot - 1); | |
15b71abe JA |
4036 | err: |
4037 | putname(req->open.filename); | |
8fef80bf | 4038 | req->flags &= ~REQ_F_NEED_CLEANUP; |
15b71abe | 4039 | if (ret < 0) |
93d2bcd2 | 4040 | req_set_fail(req); |
0bdf3398 | 4041 | __io_req_complete(req, issue_flags, ret, 0); |
15b71abe JA |
4042 | return 0; |
4043 | } | |
4044 | ||
45d189c6 | 4045 | static int io_openat(struct io_kiocb *req, unsigned int issue_flags) |
cebdb986 | 4046 | { |
e45cff58 | 4047 | return io_openat2(req, issue_flags); |
cebdb986 JA |
4048 | } |
4049 | ||
067524e9 JA |
4050 | static int io_remove_buffers_prep(struct io_kiocb *req, |
4051 | const struct io_uring_sqe *sqe) | |
4052 | { | |
4053 | struct io_provide_buf *p = &req->pbuf; | |
4054 | u64 tmp; | |
4055 | ||
26578cda PB |
4056 | if (sqe->ioprio || sqe->rw_flags || sqe->addr || sqe->len || sqe->off || |
4057 | sqe->splice_fd_in) | |
067524e9 JA |
4058 | return -EINVAL; |
4059 | ||
4060 | tmp = READ_ONCE(sqe->fd); | |
4061 | if (!tmp || tmp > USHRT_MAX) | |
4062 | return -EINVAL; | |
4063 | ||
4064 | memset(p, 0, sizeof(*p)); | |
4065 | p->nbufs = tmp; | |
4066 | p->bgid = READ_ONCE(sqe->buf_group); | |
4067 | return 0; | |
4068 | } | |
4069 | ||
4070 | static int __io_remove_buffers(struct io_ring_ctx *ctx, struct io_buffer *buf, | |
4071 | int bgid, unsigned nbufs) | |
4072 | { | |
4073 | unsigned i = 0; | |
4074 | ||
4075 | /* shouldn't happen */ | |
4076 | if (!nbufs) | |
4077 | return 0; | |
4078 | ||
4079 | /* the head kbuf is the list itself */ | |
4080 | while (!list_empty(&buf->list)) { | |
4081 | struct io_buffer *nxt; | |
4082 | ||
4083 | nxt = list_first_entry(&buf->list, struct io_buffer, list); | |
4084 | list_del(&nxt->list); | |
4085 | kfree(nxt); | |
4086 | if (++i == nbufs) | |
4087 | return i; | |
4088 | } | |
4089 | i++; | |
4090 | kfree(buf); | |
9e15c3a0 | 4091 | xa_erase(&ctx->io_buffers, bgid); |
067524e9 JA |
4092 | |
4093 | return i; | |
4094 | } | |
4095 | ||
889fca73 | 4096 | static int io_remove_buffers(struct io_kiocb *req, unsigned int issue_flags) |
067524e9 JA |
4097 | { |
4098 | struct io_provide_buf *p = &req->pbuf; | |
4099 | struct io_ring_ctx *ctx = req->ctx; | |
4100 | struct io_buffer *head; | |
4101 | int ret = 0; | |
45d189c6 | 4102 | bool force_nonblock = issue_flags & IO_URING_F_NONBLOCK; |
067524e9 JA |
4103 | |
4104 | io_ring_submit_lock(ctx, !force_nonblock); | |
4105 | ||
4106 | lockdep_assert_held(&ctx->uring_lock); | |
4107 | ||
4108 | ret = -ENOENT; | |
9e15c3a0 | 4109 | head = xa_load(&ctx->io_buffers, p->bgid); |
067524e9 JA |
4110 | if (head) |
4111 | ret = __io_remove_buffers(ctx, head, p->bgid, p->nbufs); | |
067524e9 | 4112 | if (ret < 0) |
93d2bcd2 | 4113 | req_set_fail(req); |
067524e9 | 4114 | |
9fb8cb49 PB |
4115 | /* complete before unlock, IOPOLL may need the lock */ |
4116 | __io_req_complete(req, issue_flags, ret, 0); | |
4117 | io_ring_submit_unlock(ctx, !force_nonblock); | |
067524e9 JA |
4118 | return 0; |
4119 | } | |
4120 | ||
ddf0322d JA |
4121 | static int io_provide_buffers_prep(struct io_kiocb *req, |
4122 | const struct io_uring_sqe *sqe) | |
4123 | { | |
38134ada | 4124 | unsigned long size, tmp_check; |
ddf0322d JA |
4125 | struct io_provide_buf *p = &req->pbuf; |
4126 | u64 tmp; | |
4127 | ||
26578cda | 4128 | if (sqe->ioprio || sqe->rw_flags || sqe->splice_fd_in) |
ddf0322d JA |
4129 | return -EINVAL; |
4130 | ||
4131 | tmp = READ_ONCE(sqe->fd); | |
4132 | if (!tmp || tmp > USHRT_MAX) | |
4133 | return -E2BIG; | |
4134 | p->nbufs = tmp; | |
4135 | p->addr = READ_ONCE(sqe->addr); | |
4136 | p->len = READ_ONCE(sqe->len); | |
4137 | ||
38134ada PB |
4138 | if (check_mul_overflow((unsigned long)p->len, (unsigned long)p->nbufs, |
4139 | &size)) | |
4140 | return -EOVERFLOW; | |
4141 | if (check_add_overflow((unsigned long)p->addr, size, &tmp_check)) | |
4142 | return -EOVERFLOW; | |
4143 | ||
d81269fe PB |
4144 | size = (unsigned long)p->len * p->nbufs; |
4145 | if (!access_ok(u64_to_user_ptr(p->addr), size)) | |
ddf0322d JA |
4146 | return -EFAULT; |
4147 | ||
4148 | p->bgid = READ_ONCE(sqe->buf_group); | |
4149 | tmp = READ_ONCE(sqe->off); | |
4150 | if (tmp > USHRT_MAX) | |
4151 | return -E2BIG; | |
4152 | p->bid = tmp; | |
4153 | return 0; | |
4154 | } | |
4155 | ||
4156 | static int io_add_buffers(struct io_provide_buf *pbuf, struct io_buffer **head) | |
4157 | { | |
4158 | struct io_buffer *buf; | |
4159 | u64 addr = pbuf->addr; | |
4160 | int i, bid = pbuf->bid; | |
4161 | ||
4162 | for (i = 0; i < pbuf->nbufs; i++) { | |
4163 | buf = kmalloc(sizeof(*buf), GFP_KERNEL); | |
4164 | if (!buf) | |
4165 | break; | |
4166 | ||
4167 | buf->addr = addr; | |
d1f82808 | 4168 | buf->len = min_t(__u32, pbuf->len, MAX_RW_COUNT); |
ddf0322d JA |
4169 | buf->bid = bid; |
4170 | addr += pbuf->len; | |
4171 | bid++; | |
4172 | if (!*head) { | |
4173 | INIT_LIST_HEAD(&buf->list); | |
4174 | *head = buf; | |
4175 | } else { | |
4176 | list_add_tail(&buf->list, &(*head)->list); | |
4177 | } | |
4178 | } | |
4179 | ||
4180 | return i ? i : -ENOMEM; | |
4181 | } | |
4182 | ||
889fca73 | 4183 | static int io_provide_buffers(struct io_kiocb *req, unsigned int issue_flags) |
ddf0322d JA |
4184 | { |
4185 | struct io_provide_buf *p = &req->pbuf; | |
4186 | struct io_ring_ctx *ctx = req->ctx; | |
4187 | struct io_buffer *head, *list; | |
4188 | int ret = 0; | |
45d189c6 | 4189 | bool force_nonblock = issue_flags & IO_URING_F_NONBLOCK; |
ddf0322d JA |
4190 | |
4191 | io_ring_submit_lock(ctx, !force_nonblock); | |
4192 | ||
4193 | lockdep_assert_held(&ctx->uring_lock); | |
4194 | ||
9e15c3a0 | 4195 | list = head = xa_load(&ctx->io_buffers, p->bgid); |
ddf0322d JA |
4196 | |
4197 | ret = io_add_buffers(p, &head); | |
9e15c3a0 JA |
4198 | if (ret >= 0 && !list) { |
4199 | ret = xa_insert(&ctx->io_buffers, p->bgid, head, GFP_KERNEL); | |
4200 | if (ret < 0) | |
067524e9 | 4201 | __io_remove_buffers(ctx, head, p->bgid, -1U); |
ddf0322d | 4202 | } |
ddf0322d | 4203 | if (ret < 0) |
93d2bcd2 | 4204 | req_set_fail(req); |
9fb8cb49 PB |
4205 | /* complete before unlock, IOPOLL may need the lock */ |
4206 | __io_req_complete(req, issue_flags, ret, 0); | |
4207 | io_ring_submit_unlock(ctx, !force_nonblock); | |
ddf0322d | 4208 | return 0; |
cebdb986 JA |
4209 | } |
4210 | ||
3e4827b0 JA |
4211 | static int io_epoll_ctl_prep(struct io_kiocb *req, |
4212 | const struct io_uring_sqe *sqe) | |
4213 | { | |
4214 | #if defined(CONFIG_EPOLL) | |
26578cda | 4215 | if (sqe->ioprio || sqe->buf_index || sqe->splice_fd_in) |
3e4827b0 | 4216 | return -EINVAL; |
2d74d042 | 4217 | if (unlikely(req->ctx->flags & IORING_SETUP_IOPOLL)) |
3232dd02 | 4218 | return -EINVAL; |
3e4827b0 JA |
4219 | |
4220 | req->epoll.epfd = READ_ONCE(sqe->fd); | |
4221 | req->epoll.op = READ_ONCE(sqe->len); | |
4222 | req->epoll.fd = READ_ONCE(sqe->off); | |
4223 | ||
4224 | if (ep_op_has_event(req->epoll.op)) { | |
4225 | struct epoll_event __user *ev; | |
4226 | ||
4227 | ev = u64_to_user_ptr(READ_ONCE(sqe->addr)); | |
4228 | if (copy_from_user(&req->epoll.event, ev, sizeof(*ev))) | |
4229 | return -EFAULT; | |
4230 | } | |
4231 | ||
4232 | return 0; | |
4233 | #else | |
4234 | return -EOPNOTSUPP; | |
4235 | #endif | |
4236 | } | |
4237 | ||
889fca73 | 4238 | static int io_epoll_ctl(struct io_kiocb *req, unsigned int issue_flags) |
3e4827b0 JA |
4239 | { |
4240 | #if defined(CONFIG_EPOLL) | |
4241 | struct io_epoll *ie = &req->epoll; | |
4242 | int ret; | |
45d189c6 | 4243 | bool force_nonblock = issue_flags & IO_URING_F_NONBLOCK; |
3e4827b0 JA |
4244 | |
4245 | ret = do_epoll_ctl(ie->epfd, ie->op, ie->fd, &ie->event, force_nonblock); | |
4246 | if (force_nonblock && ret == -EAGAIN) | |
4247 | return -EAGAIN; | |
4248 | ||
4249 | if (ret < 0) | |
93d2bcd2 | 4250 | req_set_fail(req); |
889fca73 | 4251 | __io_req_complete(req, issue_flags, ret, 0); |
3e4827b0 JA |
4252 | return 0; |
4253 | #else | |
4254 | return -EOPNOTSUPP; | |
4255 | #endif | |
4256 | } | |
4257 | ||
c1ca757b JA |
4258 | static int io_madvise_prep(struct io_kiocb *req, const struct io_uring_sqe *sqe) |
4259 | { | |
4260 | #if defined(CONFIG_ADVISE_SYSCALLS) && defined(CONFIG_MMU) | |
26578cda | 4261 | if (sqe->ioprio || sqe->buf_index || sqe->off || sqe->splice_fd_in) |
c1ca757b | 4262 | return -EINVAL; |
3232dd02 PB |
4263 | if (unlikely(req->ctx->flags & IORING_SETUP_IOPOLL)) |
4264 | return -EINVAL; | |
c1ca757b JA |
4265 | |
4266 | req->madvise.addr = READ_ONCE(sqe->addr); | |
4267 | req->madvise.len = READ_ONCE(sqe->len); | |
4268 | req->madvise.advice = READ_ONCE(sqe->fadvise_advice); | |
4269 | return 0; | |
4270 | #else | |
4271 | return -EOPNOTSUPP; | |
4272 | #endif | |
4273 | } | |
4274 | ||
45d189c6 | 4275 | static int io_madvise(struct io_kiocb *req, unsigned int issue_flags) |
c1ca757b JA |
4276 | { |
4277 | #if defined(CONFIG_ADVISE_SYSCALLS) && defined(CONFIG_MMU) | |
4278 | struct io_madvise *ma = &req->madvise; | |
4279 | int ret; | |
4280 | ||
45d189c6 | 4281 | if (issue_flags & IO_URING_F_NONBLOCK) |
c1ca757b JA |
4282 | return -EAGAIN; |
4283 | ||
0726b01e | 4284 | ret = do_madvise(current->mm, ma->addr, ma->len, ma->advice); |
c1ca757b | 4285 | if (ret < 0) |
93d2bcd2 | 4286 | req_set_fail(req); |
e1e16097 | 4287 | io_req_complete(req, ret); |
c1ca757b JA |
4288 | return 0; |
4289 | #else | |
4290 | return -EOPNOTSUPP; | |
4291 | #endif | |
4292 | } | |
4293 | ||
4840e418 JA |
4294 | static int io_fadvise_prep(struct io_kiocb *req, const struct io_uring_sqe *sqe) |
4295 | { | |
26578cda | 4296 | if (sqe->ioprio || sqe->buf_index || sqe->addr || sqe->splice_fd_in) |
4840e418 | 4297 | return -EINVAL; |
3232dd02 PB |
4298 | if (unlikely(req->ctx->flags & IORING_SETUP_IOPOLL)) |
4299 | return -EINVAL; | |
4840e418 JA |
4300 | |
4301 | req->fadvise.offset = READ_ONCE(sqe->off); | |
4302 | req->fadvise.len = READ_ONCE(sqe->len); | |
4303 | req->fadvise.advice = READ_ONCE(sqe->fadvise_advice); | |
4304 | return 0; | |
4305 | } | |
4306 | ||
45d189c6 | 4307 | static int io_fadvise(struct io_kiocb *req, unsigned int issue_flags) |
4840e418 JA |
4308 | { |
4309 | struct io_fadvise *fa = &req->fadvise; | |
4310 | int ret; | |
4311 | ||
45d189c6 | 4312 | if (issue_flags & IO_URING_F_NONBLOCK) { |
3e69426d JA |
4313 | switch (fa->advice) { |
4314 | case POSIX_FADV_NORMAL: | |
4315 | case POSIX_FADV_RANDOM: | |
4316 | case POSIX_FADV_SEQUENTIAL: | |
4317 | break; | |
4318 | default: | |
4319 | return -EAGAIN; | |
4320 | } | |
4321 | } | |
4840e418 JA |
4322 | |
4323 | ret = vfs_fadvise(req->file, fa->offset, fa->len, fa->advice); | |
4324 | if (ret < 0) | |
93d2bcd2 | 4325 | req_set_fail(req); |
0bdf3398 | 4326 | __io_req_complete(req, issue_flags, ret, 0); |
4840e418 JA |
4327 | return 0; |
4328 | } | |
4329 | ||
eddc7ef5 JA |
4330 | static int io_statx_prep(struct io_kiocb *req, const struct io_uring_sqe *sqe) |
4331 | { | |
2d74d042 | 4332 | if (unlikely(req->ctx->flags & IORING_SETUP_IOPOLL)) |
3232dd02 | 4333 | return -EINVAL; |
26578cda | 4334 | if (sqe->ioprio || sqe->buf_index || sqe->splice_fd_in) |
eddc7ef5 | 4335 | return -EINVAL; |
9c280f90 | 4336 | if (req->flags & REQ_F_FIXED_FILE) |
cf3040ca | 4337 | return -EBADF; |
eddc7ef5 | 4338 | |
1d9e1288 BM |
4339 | req->statx.dfd = READ_ONCE(sqe->fd); |
4340 | req->statx.mask = READ_ONCE(sqe->len); | |
e62753e4 | 4341 | req->statx.filename = u64_to_user_ptr(READ_ONCE(sqe->addr)); |
1d9e1288 BM |
4342 | req->statx.buffer = u64_to_user_ptr(READ_ONCE(sqe->addr2)); |
4343 | req->statx.flags = READ_ONCE(sqe->statx_flags); | |
eddc7ef5 JA |
4344 | |
4345 | return 0; | |
4346 | } | |
4347 | ||
45d189c6 | 4348 | static int io_statx(struct io_kiocb *req, unsigned int issue_flags) |
eddc7ef5 | 4349 | { |
1d9e1288 | 4350 | struct io_statx *ctx = &req->statx; |
eddc7ef5 JA |
4351 | int ret; |
4352 | ||
59d70013 | 4353 | if (issue_flags & IO_URING_F_NONBLOCK) |
eddc7ef5 JA |
4354 | return -EAGAIN; |
4355 | ||
e62753e4 BM |
4356 | ret = do_statx(ctx->dfd, ctx->filename, ctx->flags, ctx->mask, |
4357 | ctx->buffer); | |
eddc7ef5 | 4358 | |
eddc7ef5 | 4359 | if (ret < 0) |
93d2bcd2 | 4360 | req_set_fail(req); |
e1e16097 | 4361 | io_req_complete(req, ret); |
eddc7ef5 JA |
4362 | return 0; |
4363 | } | |
4364 | ||
b5dba59e JA |
4365 | static int io_close_prep(struct io_kiocb *req, const struct io_uring_sqe *sqe) |
4366 | { | |
14587a46 | 4367 | if (unlikely(req->ctx->flags & IORING_SETUP_IOPOLL)) |
3232dd02 | 4368 | return -EINVAL; |
b5dba59e | 4369 | if (sqe->ioprio || sqe->off || sqe->addr || sqe->len || |
26578cda | 4370 | sqe->rw_flags || sqe->buf_index || sqe->splice_fd_in) |
b5dba59e | 4371 | return -EINVAL; |
9c280f90 | 4372 | if (req->flags & REQ_F_FIXED_FILE) |
cf3040ca | 4373 | return -EBADF; |
b5dba59e JA |
4374 | |
4375 | req->close.fd = READ_ONCE(sqe->fd); | |
b5dba59e | 4376 | return 0; |
b5dba59e JA |
4377 | } |
4378 | ||
889fca73 | 4379 | static int io_close(struct io_kiocb *req, unsigned int issue_flags) |
b5dba59e | 4380 | { |
9eac1904 | 4381 | struct files_struct *files = current->files; |
3af73b28 | 4382 | struct io_close *close = &req->close; |
9eac1904 | 4383 | struct fdtable *fdt; |
a1fde923 PB |
4384 | struct file *file = NULL; |
4385 | int ret = -EBADF; | |
b5dba59e | 4386 | |
9eac1904 JA |
4387 | spin_lock(&files->file_lock); |
4388 | fdt = files_fdtable(files); | |
4389 | if (close->fd >= fdt->max_fds) { | |
4390 | spin_unlock(&files->file_lock); | |
4391 | goto err; | |
4392 | } | |
4393 | file = fdt->fd[close->fd]; | |
a1fde923 | 4394 | if (!file || file->f_op == &io_uring_fops) { |
9eac1904 JA |
4395 | spin_unlock(&files->file_lock); |
4396 | file = NULL; | |
4397 | goto err; | |
3af73b28 | 4398 | } |
b5dba59e JA |
4399 | |
4400 | /* if the file has a flush method, be safe and punt to async */ | |
45d189c6 | 4401 | if (file->f_op->flush && (issue_flags & IO_URING_F_NONBLOCK)) { |
9eac1904 | 4402 | spin_unlock(&files->file_lock); |
0bf0eefd | 4403 | return -EAGAIN; |
a2100672 | 4404 | } |
b5dba59e | 4405 | |
9eac1904 JA |
4406 | ret = __close_fd_get_file(close->fd, &file); |
4407 | spin_unlock(&files->file_lock); | |
4408 | if (ret < 0) { | |
4409 | if (ret == -ENOENT) | |
4410 | ret = -EBADF; | |
4411 | goto err; | |
4412 | } | |
4413 | ||
3af73b28 | 4414 | /* No ->flush() or already async, safely close from here */ |
9eac1904 JA |
4415 | ret = filp_close(file, current->files); |
4416 | err: | |
3af73b28 | 4417 | if (ret < 0) |
93d2bcd2 | 4418 | req_set_fail(req); |
9eac1904 JA |
4419 | if (file) |
4420 | fput(file); | |
889fca73 | 4421 | __io_req_complete(req, issue_flags, ret, 0); |
1a417f4e | 4422 | return 0; |
b5dba59e JA |
4423 | } |
4424 | ||
1155c76a | 4425 | static int io_sfr_prep(struct io_kiocb *req, const struct io_uring_sqe *sqe) |
5d17b4a4 JA |
4426 | { |
4427 | struct io_ring_ctx *ctx = req->ctx; | |
5d17b4a4 | 4428 | |
5d17b4a4 JA |
4429 | if (unlikely(ctx->flags & IORING_SETUP_IOPOLL)) |
4430 | return -EINVAL; | |
26578cda PB |
4431 | if (unlikely(sqe->addr || sqe->ioprio || sqe->buf_index || |
4432 | sqe->splice_fd_in)) | |
5d17b4a4 JA |
4433 | return -EINVAL; |
4434 | ||
8ed8d3c3 JA |
4435 | req->sync.off = READ_ONCE(sqe->off); |
4436 | req->sync.len = READ_ONCE(sqe->len); | |
4437 | req->sync.flags = READ_ONCE(sqe->sync_range_flags); | |
8ed8d3c3 JA |
4438 | return 0; |
4439 | } | |
4440 | ||
45d189c6 | 4441 | static int io_sync_file_range(struct io_kiocb *req, unsigned int issue_flags) |
8ed8d3c3 | 4442 | { |
8ed8d3c3 JA |
4443 | int ret; |
4444 | ||
ac45abc0 | 4445 | /* sync_file_range always requires a blocking context */ |
45d189c6 | 4446 | if (issue_flags & IO_URING_F_NONBLOCK) |
ac45abc0 PB |
4447 | return -EAGAIN; |
4448 | ||
9adbd45d | 4449 | ret = sync_file_range(req->file, req->sync.off, req->sync.len, |
8ed8d3c3 JA |
4450 | req->sync.flags); |
4451 | if (ret < 0) | |
93d2bcd2 | 4452 | req_set_fail(req); |
e1e16097 | 4453 | io_req_complete(req, ret); |
5d17b4a4 JA |
4454 | return 0; |
4455 | } | |
4456 | ||
469956e8 | 4457 | #if defined(CONFIG_NET) |
02d27d89 PB |
4458 | static int io_setup_async_msg(struct io_kiocb *req, |
4459 | struct io_async_msghdr *kmsg) | |
4460 | { | |
e8c2bc1f JA |
4461 | struct io_async_msghdr *async_msg = req->async_data; |
4462 | ||
4463 | if (async_msg) | |
02d27d89 | 4464 | return -EAGAIN; |
e8c2bc1f | 4465 | if (io_alloc_async_data(req)) { |
257e84a5 | 4466 | kfree(kmsg->free_iov); |
02d27d89 PB |
4467 | return -ENOMEM; |
4468 | } | |
e8c2bc1f | 4469 | async_msg = req->async_data; |
02d27d89 | 4470 | req->flags |= REQ_F_NEED_CLEANUP; |
e8c2bc1f | 4471 | memcpy(async_msg, kmsg, sizeof(*kmsg)); |
2a780802 | 4472 | async_msg->msg.msg_name = &async_msg->addr; |
257e84a5 PB |
4473 | /* if were using fast_iov, set it to the new one */ |
4474 | if (!async_msg->free_iov) | |
4475 | async_msg->msg.msg_iter.iov = async_msg->fast_iov; | |
4476 | ||
02d27d89 PB |
4477 | return -EAGAIN; |
4478 | } | |
4479 | ||
2ae523ed PB |
4480 | static int io_sendmsg_copy_hdr(struct io_kiocb *req, |
4481 | struct io_async_msghdr *iomsg) | |
4482 | { | |
2ae523ed | 4483 | iomsg->msg.msg_name = &iomsg->addr; |
257e84a5 | 4484 | iomsg->free_iov = iomsg->fast_iov; |
2ae523ed | 4485 | return sendmsg_copy_msghdr(&iomsg->msg, req->sr_msg.umsg, |
257e84a5 | 4486 | req->sr_msg.msg_flags, &iomsg->free_iov); |
2ae523ed PB |
4487 | } |
4488 | ||
93642ef8 PB |
4489 | static int io_sendmsg_prep_async(struct io_kiocb *req) |
4490 | { | |
4491 | int ret; | |
4492 | ||
93642ef8 PB |
4493 | ret = io_sendmsg_copy_hdr(req, req->async_data); |
4494 | if (!ret) | |
4495 | req->flags |= REQ_F_NEED_CLEANUP; | |
4496 | return ret; | |
4497 | } | |
4498 | ||
3529d8c2 | 4499 | static int io_sendmsg_prep(struct io_kiocb *req, const struct io_uring_sqe *sqe) |
03b1230c | 4500 | { |
e47293fd | 4501 | struct io_sr_msg *sr = &req->sr_msg; |
03b1230c | 4502 | |
d2b6f48b PB |
4503 | if (unlikely(req->ctx->flags & IORING_SETUP_IOPOLL)) |
4504 | return -EINVAL; | |
4505 | ||
270a5940 | 4506 | sr->umsg = u64_to_user_ptr(READ_ONCE(sqe->addr)); |
fddaface | 4507 | sr->len = READ_ONCE(sqe->len); |
04411806 PB |
4508 | sr->msg_flags = READ_ONCE(sqe->msg_flags) | MSG_NOSIGNAL; |
4509 | if (sr->msg_flags & MSG_DONTWAIT) | |
4510 | req->flags |= REQ_F_NOWAIT; | |
3529d8c2 | 4511 | |
d8768362 JA |
4512 | #ifdef CONFIG_COMPAT |
4513 | if (req->ctx->compat) | |
4514 | sr->msg_flags |= MSG_CMSG_COMPAT; | |
4515 | #endif | |
93642ef8 | 4516 | return 0; |
03b1230c JA |
4517 | } |
4518 | ||
889fca73 | 4519 | static int io_sendmsg(struct io_kiocb *req, unsigned int issue_flags) |
aa1fa28f | 4520 | { |
6b754c8b | 4521 | struct io_async_msghdr iomsg, *kmsg; |
0fa03c62 | 4522 | struct socket *sock; |
7a7cacba | 4523 | unsigned flags; |
0031275d | 4524 | int min_ret = 0; |
0fa03c62 JA |
4525 | int ret; |
4526 | ||
dba4a925 | 4527 | sock = sock_from_file(req->file); |
7a7cacba | 4528 | if (unlikely(!sock)) |
dba4a925 | 4529 | return -ENOTSOCK; |
3529d8c2 | 4530 | |
257e84a5 PB |
4531 | kmsg = req->async_data; |
4532 | if (!kmsg) { | |
7a7cacba PB |
4533 | ret = io_sendmsg_copy_hdr(req, &iomsg); |
4534 | if (ret) | |
4535 | return ret; | |
4536 | kmsg = &iomsg; | |
0fa03c62 | 4537 | } |
0fa03c62 | 4538 | |
04411806 PB |
4539 | flags = req->sr_msg.msg_flags; |
4540 | if (issue_flags & IO_URING_F_NONBLOCK) | |
7a7cacba | 4541 | flags |= MSG_DONTWAIT; |
0031275d SM |
4542 | if (flags & MSG_WAITALL) |
4543 | min_ret = iov_iter_count(&kmsg->msg.msg_iter); | |
4544 | ||
7a7cacba | 4545 | ret = __sys_sendmsg_sock(sock, &kmsg->msg, flags); |
45d189c6 | 4546 | if ((issue_flags & IO_URING_F_NONBLOCK) && ret == -EAGAIN) |
7a7cacba PB |
4547 | return io_setup_async_msg(req, kmsg); |
4548 | if (ret == -ERESTARTSYS) | |
4549 | ret = -EINTR; | |
0fa03c62 | 4550 | |
257e84a5 PB |
4551 | /* fast path, check for non-NULL to avoid function call */ |
4552 | if (kmsg->free_iov) | |
4553 | kfree(kmsg->free_iov); | |
99bc4c38 | 4554 | req->flags &= ~REQ_F_NEED_CLEANUP; |
0031275d | 4555 | if (ret < min_ret) |
93d2bcd2 | 4556 | req_set_fail(req); |
889fca73 | 4557 | __io_req_complete(req, issue_flags, ret, 0); |
5d17b4a4 | 4558 | return 0; |
03b1230c | 4559 | } |
aa1fa28f | 4560 | |
889fca73 | 4561 | static int io_send(struct io_kiocb *req, unsigned int issue_flags) |
fddaface | 4562 | { |
7a7cacba PB |
4563 | struct io_sr_msg *sr = &req->sr_msg; |
4564 | struct msghdr msg; | |
4565 | struct iovec iov; | |
fddaface | 4566 | struct socket *sock; |
7a7cacba | 4567 | unsigned flags; |
0031275d | 4568 | int min_ret = 0; |
fddaface JA |
4569 | int ret; |
4570 | ||
dba4a925 | 4571 | sock = sock_from_file(req->file); |
7a7cacba | 4572 | if (unlikely(!sock)) |
dba4a925 | 4573 | return -ENOTSOCK; |
fddaface | 4574 | |
7a7cacba PB |
4575 | ret = import_single_range(WRITE, sr->buf, sr->len, &iov, &msg.msg_iter); |
4576 | if (unlikely(ret)) | |
14db8411 | 4577 | return ret; |
fddaface | 4578 | |
7a7cacba PB |
4579 | msg.msg_name = NULL; |
4580 | msg.msg_control = NULL; | |
4581 | msg.msg_controllen = 0; | |
4582 | msg.msg_namelen = 0; | |
fddaface | 4583 | |
04411806 PB |
4584 | flags = req->sr_msg.msg_flags; |
4585 | if (issue_flags & IO_URING_F_NONBLOCK) | |
7a7cacba | 4586 | flags |= MSG_DONTWAIT; |
0031275d SM |
4587 | if (flags & MSG_WAITALL) |
4588 | min_ret = iov_iter_count(&msg.msg_iter); | |
4589 | ||
7a7cacba PB |
4590 | msg.msg_flags = flags; |
4591 | ret = sock_sendmsg(sock, &msg); | |
45d189c6 | 4592 | if ((issue_flags & IO_URING_F_NONBLOCK) && ret == -EAGAIN) |
7a7cacba PB |
4593 | return -EAGAIN; |
4594 | if (ret == -ERESTARTSYS) | |
4595 | ret = -EINTR; | |
fddaface | 4596 | |
0031275d | 4597 | if (ret < min_ret) |
93d2bcd2 | 4598 | req_set_fail(req); |
889fca73 | 4599 | __io_req_complete(req, issue_flags, ret, 0); |
fddaface | 4600 | return 0; |
fddaface JA |
4601 | } |
4602 | ||
1400e697 PB |
4603 | static int __io_recvmsg_copy_hdr(struct io_kiocb *req, |
4604 | struct io_async_msghdr *iomsg) | |
52de1fe1 JA |
4605 | { |
4606 | struct io_sr_msg *sr = &req->sr_msg; | |
4607 | struct iovec __user *uiov; | |
4608 | size_t iov_len; | |
4609 | int ret; | |
4610 | ||
1400e697 PB |
4611 | ret = __copy_msghdr_from_user(&iomsg->msg, sr->umsg, |
4612 | &iomsg->uaddr, &uiov, &iov_len); | |
52de1fe1 JA |
4613 | if (ret) |
4614 | return ret; | |
4615 | ||
4616 | if (req->flags & REQ_F_BUFFER_SELECT) { | |
4617 | if (iov_len > 1) | |
4618 | return -EINVAL; | |
5476dfed | 4619 | if (copy_from_user(iomsg->fast_iov, uiov, sizeof(*uiov))) |
52de1fe1 | 4620 | return -EFAULT; |
5476dfed | 4621 | sr->len = iomsg->fast_iov[0].iov_len; |
257e84a5 | 4622 | iomsg->free_iov = NULL; |
52de1fe1 | 4623 | } else { |
257e84a5 | 4624 | iomsg->free_iov = iomsg->fast_iov; |
89cd35c5 | 4625 | ret = __import_iovec(READ, uiov, iov_len, UIO_FASTIOV, |
257e84a5 | 4626 | &iomsg->free_iov, &iomsg->msg.msg_iter, |
89cd35c5 | 4627 | false); |
52de1fe1 JA |
4628 | if (ret > 0) |
4629 | ret = 0; | |
4630 | } | |
4631 | ||
4632 | return ret; | |
4633 | } | |
4634 | ||
4635 | #ifdef CONFIG_COMPAT | |
4636 | static int __io_compat_recvmsg_copy_hdr(struct io_kiocb *req, | |
1400e697 | 4637 | struct io_async_msghdr *iomsg) |
52de1fe1 | 4638 | { |
52de1fe1 JA |
4639 | struct io_sr_msg *sr = &req->sr_msg; |
4640 | struct compat_iovec __user *uiov; | |
4641 | compat_uptr_t ptr; | |
4642 | compat_size_t len; | |
4643 | int ret; | |
4644 | ||
4af3417a PB |
4645 | ret = __get_compat_msghdr(&iomsg->msg, sr->umsg_compat, &iomsg->uaddr, |
4646 | &ptr, &len); | |
52de1fe1 JA |
4647 | if (ret) |
4648 | return ret; | |
4649 | ||
4650 | uiov = compat_ptr(ptr); | |
4651 | if (req->flags & REQ_F_BUFFER_SELECT) { | |
4652 | compat_ssize_t clen; | |
4653 | ||
4654 | if (len > 1) | |
4655 | return -EINVAL; | |
4656 | if (!access_ok(uiov, sizeof(*uiov))) | |
4657 | return -EFAULT; | |
4658 | if (__get_user(clen, &uiov->iov_len)) | |
4659 | return -EFAULT; | |
4660 | if (clen < 0) | |
4661 | return -EINVAL; | |
2d280bc8 | 4662 | sr->len = clen; |
257e84a5 | 4663 | iomsg->free_iov = NULL; |
52de1fe1 | 4664 | } else { |
257e84a5 | 4665 | iomsg->free_iov = iomsg->fast_iov; |
89cd35c5 | 4666 | ret = __import_iovec(READ, (struct iovec __user *)uiov, len, |
257e84a5 | 4667 | UIO_FASTIOV, &iomsg->free_iov, |
89cd35c5 | 4668 | &iomsg->msg.msg_iter, true); |
52de1fe1 JA |
4669 | if (ret < 0) |
4670 | return ret; | |
4671 | } | |
4672 | ||
4673 | return 0; | |
4674 | } | |
4675 | #endif | |
4676 | ||
1400e697 PB |
4677 | static int io_recvmsg_copy_hdr(struct io_kiocb *req, |
4678 | struct io_async_msghdr *iomsg) | |
52de1fe1 | 4679 | { |
1400e697 | 4680 | iomsg->msg.msg_name = &iomsg->addr; |
52de1fe1 JA |
4681 | |
4682 | #ifdef CONFIG_COMPAT | |
4683 | if (req->ctx->compat) | |
1400e697 | 4684 | return __io_compat_recvmsg_copy_hdr(req, iomsg); |
fddaface | 4685 | #endif |
52de1fe1 | 4686 | |
1400e697 | 4687 | return __io_recvmsg_copy_hdr(req, iomsg); |
52de1fe1 JA |
4688 | } |
4689 | ||
bcda7baa | 4690 | static struct io_buffer *io_recv_buffer_select(struct io_kiocb *req, |
7fbb1b54 | 4691 | bool needs_lock) |
bcda7baa JA |
4692 | { |
4693 | struct io_sr_msg *sr = &req->sr_msg; | |
4694 | struct io_buffer *kbuf; | |
4695 | ||
bcda7baa JA |
4696 | kbuf = io_buffer_select(req, &sr->len, sr->bgid, sr->kbuf, needs_lock); |
4697 | if (IS_ERR(kbuf)) | |
4698 | return kbuf; | |
4699 | ||
4700 | sr->kbuf = kbuf; | |
4701 | req->flags |= REQ_F_BUFFER_SELECTED; | |
bcda7baa | 4702 | return kbuf; |
fddaface JA |
4703 | } |
4704 | ||
7fbb1b54 PB |
4705 | static inline unsigned int io_put_recv_kbuf(struct io_kiocb *req) |
4706 | { | |
4707 | return io_put_kbuf(req, req->sr_msg.kbuf); | |
4708 | } | |
4709 | ||
93642ef8 | 4710 | static int io_recvmsg_prep_async(struct io_kiocb *req) |
aa1fa28f | 4711 | { |
99bc4c38 | 4712 | int ret; |
3529d8c2 | 4713 | |
93642ef8 PB |
4714 | ret = io_recvmsg_copy_hdr(req, req->async_data); |
4715 | if (!ret) | |
4716 | req->flags |= REQ_F_NEED_CLEANUP; | |
4717 | return ret; | |
4718 | } | |
4719 | ||
4720 | static int io_recvmsg_prep(struct io_kiocb *req, const struct io_uring_sqe *sqe) | |
4721 | { | |
4722 | struct io_sr_msg *sr = &req->sr_msg; | |
4723 | ||
d2b6f48b PB |
4724 | if (unlikely(req->ctx->flags & IORING_SETUP_IOPOLL)) |
4725 | return -EINVAL; | |
4726 | ||
270a5940 | 4727 | sr->umsg = u64_to_user_ptr(READ_ONCE(sqe->addr)); |
0b7b21e4 | 4728 | sr->len = READ_ONCE(sqe->len); |
bcda7baa | 4729 | sr->bgid = READ_ONCE(sqe->buf_group); |
04411806 PB |
4730 | sr->msg_flags = READ_ONCE(sqe->msg_flags) | MSG_NOSIGNAL; |
4731 | if (sr->msg_flags & MSG_DONTWAIT) | |
4732 | req->flags |= REQ_F_NOWAIT; | |
06b76d44 | 4733 | |
d8768362 JA |
4734 | #ifdef CONFIG_COMPAT |
4735 | if (req->ctx->compat) | |
4736 | sr->msg_flags |= MSG_CMSG_COMPAT; | |
4737 | #endif | |
93642ef8 | 4738 | return 0; |
aa1fa28f JA |
4739 | } |
4740 | ||
889fca73 | 4741 | static int io_recvmsg(struct io_kiocb *req, unsigned int issue_flags) |
aa1fa28f | 4742 | { |
6b754c8b | 4743 | struct io_async_msghdr iomsg, *kmsg; |
03b1230c | 4744 | struct socket *sock; |
7fbb1b54 | 4745 | struct io_buffer *kbuf; |
7a7cacba | 4746 | unsigned flags; |
0031275d | 4747 | int min_ret = 0; |
52de1fe1 | 4748 | int ret, cflags = 0; |
45d189c6 | 4749 | bool force_nonblock = issue_flags & IO_URING_F_NONBLOCK; |
03b1230c | 4750 | |
dba4a925 | 4751 | sock = sock_from_file(req->file); |
7a7cacba | 4752 | if (unlikely(!sock)) |
dba4a925 | 4753 | return -ENOTSOCK; |
3529d8c2 | 4754 | |
257e84a5 PB |
4755 | kmsg = req->async_data; |
4756 | if (!kmsg) { | |
7a7cacba PB |
4757 | ret = io_recvmsg_copy_hdr(req, &iomsg); |
4758 | if (ret) | |
681fda8d | 4759 | return ret; |
7a7cacba PB |
4760 | kmsg = &iomsg; |
4761 | } | |
03b1230c | 4762 | |
bc02ef33 | 4763 | if (req->flags & REQ_F_BUFFER_SELECT) { |
7fbb1b54 | 4764 | kbuf = io_recv_buffer_select(req, !force_nonblock); |
bc02ef33 | 4765 | if (IS_ERR(kbuf)) |
52de1fe1 | 4766 | return PTR_ERR(kbuf); |
7a7cacba | 4767 | kmsg->fast_iov[0].iov_base = u64_to_user_ptr(kbuf->addr); |
5476dfed PB |
4768 | kmsg->fast_iov[0].iov_len = req->sr_msg.len; |
4769 | iov_iter_init(&kmsg->msg.msg_iter, READ, kmsg->fast_iov, | |
7a7cacba PB |
4770 | 1, req->sr_msg.len); |
4771 | } | |
52de1fe1 | 4772 | |
04411806 PB |
4773 | flags = req->sr_msg.msg_flags; |
4774 | if (force_nonblock) | |
7a7cacba | 4775 | flags |= MSG_DONTWAIT; |
0031275d SM |
4776 | if (flags & MSG_WAITALL) |
4777 | min_ret = iov_iter_count(&kmsg->msg.msg_iter); | |
4778 | ||
7a7cacba PB |
4779 | ret = __sys_recvmsg_sock(sock, &kmsg->msg, req->sr_msg.umsg, |
4780 | kmsg->uaddr, flags); | |
0e1b6fe3 PB |
4781 | if (force_nonblock && ret == -EAGAIN) |
4782 | return io_setup_async_msg(req, kmsg); | |
7a7cacba PB |
4783 | if (ret == -ERESTARTSYS) |
4784 | ret = -EINTR; | |
03b1230c | 4785 | |
7fbb1b54 PB |
4786 | if (req->flags & REQ_F_BUFFER_SELECTED) |
4787 | cflags = io_put_recv_kbuf(req); | |
257e84a5 PB |
4788 | /* fast path, check for non-NULL to avoid function call */ |
4789 | if (kmsg->free_iov) | |
4790 | kfree(kmsg->free_iov); | |
99bc4c38 | 4791 | req->flags &= ~REQ_F_NEED_CLEANUP; |
0031275d | 4792 | if (ret < min_ret || ((flags & MSG_WAITALL) && (kmsg->msg.msg_flags & (MSG_TRUNC | MSG_CTRUNC)))) |
93d2bcd2 | 4793 | req_set_fail(req); |
889fca73 | 4794 | __io_req_complete(req, issue_flags, ret, cflags); |
03b1230c | 4795 | return 0; |
0fa03c62 | 4796 | } |
5d17b4a4 | 4797 | |
889fca73 | 4798 | static int io_recv(struct io_kiocb *req, unsigned int issue_flags) |
fddaface | 4799 | { |
6b754c8b | 4800 | struct io_buffer *kbuf; |
7a7cacba PB |
4801 | struct io_sr_msg *sr = &req->sr_msg; |
4802 | struct msghdr msg; | |
4803 | void __user *buf = sr->buf; | |
fddaface | 4804 | struct socket *sock; |
7a7cacba PB |
4805 | struct iovec iov; |
4806 | unsigned flags; | |
0031275d | 4807 | int min_ret = 0; |
bcda7baa | 4808 | int ret, cflags = 0; |
45d189c6 | 4809 | bool force_nonblock = issue_flags & IO_URING_F_NONBLOCK; |
fddaface | 4810 | |
dba4a925 | 4811 | sock = sock_from_file(req->file); |
7a7cacba | 4812 | if (unlikely(!sock)) |
dba4a925 | 4813 | return -ENOTSOCK; |
fddaface | 4814 | |
bc02ef33 | 4815 | if (req->flags & REQ_F_BUFFER_SELECT) { |
7fbb1b54 | 4816 | kbuf = io_recv_buffer_select(req, !force_nonblock); |
bcda7baa JA |
4817 | if (IS_ERR(kbuf)) |
4818 | return PTR_ERR(kbuf); | |
7a7cacba | 4819 | buf = u64_to_user_ptr(kbuf->addr); |
bc02ef33 | 4820 | } |
bcda7baa | 4821 | |
7a7cacba | 4822 | ret = import_single_range(READ, buf, sr->len, &iov, &msg.msg_iter); |
14c32eee PB |
4823 | if (unlikely(ret)) |
4824 | goto out_free; | |
fddaface | 4825 | |
7a7cacba PB |
4826 | msg.msg_name = NULL; |
4827 | msg.msg_control = NULL; | |
4828 | msg.msg_controllen = 0; | |
4829 | msg.msg_namelen = 0; | |
4830 | msg.msg_iocb = NULL; | |
4831 | msg.msg_flags = 0; | |
fddaface | 4832 | |
04411806 PB |
4833 | flags = req->sr_msg.msg_flags; |
4834 | if (force_nonblock) | |
7a7cacba | 4835 | flags |= MSG_DONTWAIT; |
0031275d SM |
4836 | if (flags & MSG_WAITALL) |
4837 | min_ret = iov_iter_count(&msg.msg_iter); | |
4838 | ||
7a7cacba PB |
4839 | ret = sock_recvmsg(sock, &msg, flags); |
4840 | if (force_nonblock && ret == -EAGAIN) | |
4841 | return -EAGAIN; | |
4842 | if (ret == -ERESTARTSYS) | |
4843 | ret = -EINTR; | |
14c32eee | 4844 | out_free: |
7fbb1b54 PB |
4845 | if (req->flags & REQ_F_BUFFER_SELECTED) |
4846 | cflags = io_put_recv_kbuf(req); | |
0031275d | 4847 | if (ret < min_ret || ((flags & MSG_WAITALL) && (msg.msg_flags & (MSG_TRUNC | MSG_CTRUNC)))) |
93d2bcd2 | 4848 | req_set_fail(req); |
889fca73 | 4849 | __io_req_complete(req, issue_flags, ret, cflags); |
fddaface | 4850 | return 0; |
fddaface JA |
4851 | } |
4852 | ||
3529d8c2 | 4853 | static int io_accept_prep(struct io_kiocb *req, const struct io_uring_sqe *sqe) |
17f2fe35 | 4854 | { |
8ed8d3c3 JA |
4855 | struct io_accept *accept = &req->accept; |
4856 | ||
14587a46 | 4857 | if (unlikely(req->ctx->flags & IORING_SETUP_IOPOLL)) |
17f2fe35 | 4858 | return -EINVAL; |
aaa4db12 | 4859 | if (sqe->ioprio || sqe->len || sqe->buf_index) |
17f2fe35 JA |
4860 | return -EINVAL; |
4861 | ||
d55e5f5b JA |
4862 | accept->addr = u64_to_user_ptr(READ_ONCE(sqe->addr)); |
4863 | accept->addr_len = u64_to_user_ptr(READ_ONCE(sqe->addr2)); | |
8ed8d3c3 | 4864 | accept->flags = READ_ONCE(sqe->accept_flags); |
09952e3e | 4865 | accept->nofile = rlimit(RLIMIT_NOFILE); |
a7083ad5 | 4866 | |
aaa4db12 PB |
4867 | accept->file_slot = READ_ONCE(sqe->file_index); |
4868 | if (accept->file_slot && ((req->open.how.flags & O_CLOEXEC) || | |
4869 | (accept->flags & SOCK_CLOEXEC))) | |
4870 | return -EINVAL; | |
a7083ad5 PB |
4871 | if (accept->flags & ~(SOCK_CLOEXEC | SOCK_NONBLOCK)) |
4872 | return -EINVAL; | |
4873 | if (SOCK_NONBLOCK != O_NONBLOCK && (accept->flags & SOCK_NONBLOCK)) | |
4874 | accept->flags = (accept->flags & ~SOCK_NONBLOCK) | O_NONBLOCK; | |
8ed8d3c3 | 4875 | return 0; |
8ed8d3c3 | 4876 | } |
17f2fe35 | 4877 | |
889fca73 | 4878 | static int io_accept(struct io_kiocb *req, unsigned int issue_flags) |
8ed8d3c3 JA |
4879 | { |
4880 | struct io_accept *accept = &req->accept; | |
45d189c6 | 4881 | bool force_nonblock = issue_flags & IO_URING_F_NONBLOCK; |
ac45abc0 | 4882 | unsigned int file_flags = force_nonblock ? O_NONBLOCK : 0; |
aaa4db12 | 4883 | bool fixed = !!accept->file_slot; |
a7083ad5 PB |
4884 | struct file *file; |
4885 | int ret, fd; | |
8ed8d3c3 | 4886 | |
e697deed JX |
4887 | if (req->file->f_flags & O_NONBLOCK) |
4888 | req->flags |= REQ_F_NOWAIT; | |
4889 | ||
aaa4db12 PB |
4890 | if (!fixed) { |
4891 | fd = __get_unused_fd_flags(accept->flags, accept->nofile); | |
4892 | if (unlikely(fd < 0)) | |
4893 | return fd; | |
4894 | } | |
a7083ad5 PB |
4895 | file = do_accept(req->file, file_flags, accept->addr, accept->addr_len, |
4896 | accept->flags); | |
4897 | if (IS_ERR(file)) { | |
aaa4db12 PB |
4898 | if (!fixed) |
4899 | put_unused_fd(fd); | |
a7083ad5 PB |
4900 | ret = PTR_ERR(file); |
4901 | if (ret == -EAGAIN && force_nonblock) | |
4902 | return -EAGAIN; | |
ac45abc0 PB |
4903 | if (ret == -ERESTARTSYS) |
4904 | ret = -EINTR; | |
93d2bcd2 | 4905 | req_set_fail(req); |
aaa4db12 | 4906 | } else if (!fixed) { |
a7083ad5 PB |
4907 | fd_install(fd, file); |
4908 | ret = fd; | |
aaa4db12 PB |
4909 | } else { |
4910 | ret = io_install_fixed_file(req, file, issue_flags, | |
4911 | accept->file_slot - 1); | |
ac45abc0 | 4912 | } |
889fca73 | 4913 | __io_req_complete(req, issue_flags, ret, 0); |
17f2fe35 | 4914 | return 0; |
8ed8d3c3 JA |
4915 | } |
4916 | ||
93642ef8 PB |
4917 | static int io_connect_prep_async(struct io_kiocb *req) |
4918 | { | |
4919 | struct io_async_connect *io = req->async_data; | |
4920 | struct io_connect *conn = &req->connect; | |
4921 | ||
4922 | return move_addr_to_kernel(conn->addr, conn->addr_len, &io->address); | |
4923 | } | |
4924 | ||
3529d8c2 | 4925 | static int io_connect_prep(struct io_kiocb *req, const struct io_uring_sqe *sqe) |
f499a021 | 4926 | { |
3529d8c2 | 4927 | struct io_connect *conn = &req->connect; |
f499a021 | 4928 | |
14587a46 | 4929 | if (unlikely(req->ctx->flags & IORING_SETUP_IOPOLL)) |
3fbb51c1 | 4930 | return -EINVAL; |
26578cda PB |
4931 | if (sqe->ioprio || sqe->len || sqe->buf_index || sqe->rw_flags || |
4932 | sqe->splice_fd_in) | |
3fbb51c1 JA |
4933 | return -EINVAL; |
4934 | ||
3529d8c2 JA |
4935 | conn->addr = u64_to_user_ptr(READ_ONCE(sqe->addr)); |
4936 | conn->addr_len = READ_ONCE(sqe->addr2); | |
93642ef8 | 4937 | return 0; |
f499a021 JA |
4938 | } |
4939 | ||
889fca73 | 4940 | static int io_connect(struct io_kiocb *req, unsigned int issue_flags) |
f8e85cf2 | 4941 | { |
e8c2bc1f | 4942 | struct io_async_connect __io, *io; |
f8e85cf2 | 4943 | unsigned file_flags; |
3fbb51c1 | 4944 | int ret; |
45d189c6 | 4945 | bool force_nonblock = issue_flags & IO_URING_F_NONBLOCK; |
f8e85cf2 | 4946 | |
e8c2bc1f JA |
4947 | if (req->async_data) { |
4948 | io = req->async_data; | |
f499a021 | 4949 | } else { |
3529d8c2 JA |
4950 | ret = move_addr_to_kernel(req->connect.addr, |
4951 | req->connect.addr_len, | |
e8c2bc1f | 4952 | &__io.address); |
f499a021 JA |
4953 | if (ret) |
4954 | goto out; | |
4955 | io = &__io; | |
4956 | } | |
4957 | ||
3fbb51c1 JA |
4958 | file_flags = force_nonblock ? O_NONBLOCK : 0; |
4959 | ||
e8c2bc1f | 4960 | ret = __sys_connect_file(req->file, &io->address, |
3fbb51c1 | 4961 | req->connect.addr_len, file_flags); |
87f80d62 | 4962 | if ((ret == -EAGAIN || ret == -EINPROGRESS) && force_nonblock) { |
e8c2bc1f | 4963 | if (req->async_data) |
b7bb4f7d | 4964 | return -EAGAIN; |
e8c2bc1f | 4965 | if (io_alloc_async_data(req)) { |
f499a021 JA |
4966 | ret = -ENOMEM; |
4967 | goto out; | |
4968 | } | |
e8c2bc1f | 4969 | memcpy(req->async_data, &__io, sizeof(__io)); |
f8e85cf2 | 4970 | return -EAGAIN; |
f499a021 | 4971 | } |
f8e85cf2 JA |
4972 | if (ret == -ERESTARTSYS) |
4973 | ret = -EINTR; | |
f499a021 | 4974 | out: |
4e88d6e7 | 4975 | if (ret < 0) |
93d2bcd2 | 4976 | req_set_fail(req); |
889fca73 | 4977 | __io_req_complete(req, issue_flags, ret, 0); |
f8e85cf2 | 4978 | return 0; |
469956e8 Y |
4979 | } |
4980 | #else /* !CONFIG_NET */ | |
99a10081 JA |
4981 | #define IO_NETOP_FN(op) \ |
4982 | static int io_##op(struct io_kiocb *req, unsigned int issue_flags) \ | |
4983 | { \ | |
4984 | return -EOPNOTSUPP; \ | |
4985 | } | |
4986 | ||
4987 | #define IO_NETOP_PREP(op) \ | |
4988 | IO_NETOP_FN(op) \ | |
4989 | static int io_##op##_prep(struct io_kiocb *req, const struct io_uring_sqe *sqe) \ | |
4990 | { \ | |
4991 | return -EOPNOTSUPP; \ | |
4992 | } \ | |
4993 | ||
4994 | #define IO_NETOP_PREP_ASYNC(op) \ | |
4995 | IO_NETOP_PREP(op) \ | |
4996 | static int io_##op##_prep_async(struct io_kiocb *req) \ | |
4997 | { \ | |
4998 | return -EOPNOTSUPP; \ | |
4999 | } | |
5000 | ||
5001 | IO_NETOP_PREP_ASYNC(sendmsg); | |
5002 | IO_NETOP_PREP_ASYNC(recvmsg); | |
5003 | IO_NETOP_PREP_ASYNC(connect); | |
5004 | IO_NETOP_PREP(accept); | |
5005 | IO_NETOP_FN(send); | |
5006 | IO_NETOP_FN(recv); | |
469956e8 | 5007 | #endif /* CONFIG_NET */ |
f8e85cf2 | 5008 | |
d7718a9d JA |
5009 | struct io_poll_table { |
5010 | struct poll_table_struct pt; | |
5011 | struct io_kiocb *req; | |
68b11e8b | 5012 | int nr_entries; |
d7718a9d JA |
5013 | int error; |
5014 | }; | |
ce593a6c | 5015 | |
d7718a9d | 5016 | static int __io_async_wake(struct io_kiocb *req, struct io_poll_iocb *poll, |
5b0a6acc | 5017 | __poll_t mask, io_req_tw_func_t func) |
d7718a9d | 5018 | { |
d7718a9d JA |
5019 | /* for instances that support it check for an event match first: */ |
5020 | if (mask && !(mask & poll->events)) | |
5021 | return 0; | |
5022 | ||
5023 | trace_io_uring_task_add(req->ctx, req->opcode, req->user_data, mask); | |
5024 | ||
5025 | list_del_init(&poll->wait.entry); | |
5026 | ||
d7718a9d | 5027 | req->result = mask; |
5b0a6acc | 5028 | req->io_task_work.func = func; |
6d816e08 | 5029 | |
d7718a9d | 5030 | /* |
e3aabf95 JA |
5031 | * If this fails, then the task is exiting. When a task exits, the |
5032 | * work gets canceled, so just cancel this request as well instead | |
5033 | * of executing it. We can't safely execute it anyway, as we may not | |
5034 | * have the needed state needed for it anyway. | |
d7718a9d | 5035 | */ |
e09ee510 | 5036 | io_req_task_work_add(req); |
d7718a9d JA |
5037 | return 1; |
5038 | } | |
5039 | ||
74ce6ce4 JA |
5040 | static bool io_poll_rewait(struct io_kiocb *req, struct io_poll_iocb *poll) |
5041 | __acquires(&req->ctx->completion_lock) | |
5042 | { | |
5043 | struct io_ring_ctx *ctx = req->ctx; | |
5044 | ||
316319e8 | 5045 | /* req->task == current here, checking PF_EXITING is safe */ |
e09ee510 PB |
5046 | if (unlikely(req->task->flags & PF_EXITING)) |
5047 | WRITE_ONCE(poll->canceled, true); | |
5048 | ||
74ce6ce4 JA |
5049 | if (!req->result && !READ_ONCE(poll->canceled)) { |
5050 | struct poll_table_struct pt = { ._key = poll->events }; | |
5051 | ||
5052 | req->result = vfs_poll(req->file, &pt) & poll->events; | |
5053 | } | |
5054 | ||
79ebeaee | 5055 | spin_lock(&ctx->completion_lock); |
74ce6ce4 JA |
5056 | if (!req->result && !READ_ONCE(poll->canceled)) { |
5057 | add_wait_queue(poll->head, &poll->wait); | |
5058 | return true; | |
5059 | } | |
5060 | ||
5061 | return false; | |
5062 | } | |
5063 | ||
d4e7cd36 | 5064 | static struct io_poll_iocb *io_poll_get_double(struct io_kiocb *req) |
18bceab1 | 5065 | { |
e8c2bc1f | 5066 | /* pure poll stashes this in ->async_data, poll driven retry elsewhere */ |
d4e7cd36 | 5067 | if (req->opcode == IORING_OP_POLL_ADD) |
e8c2bc1f | 5068 | return req->async_data; |
d4e7cd36 JA |
5069 | return req->apoll->double_poll; |
5070 | } | |
5071 | ||
5072 | static struct io_poll_iocb *io_poll_get_single(struct io_kiocb *req) | |
5073 | { | |
5074 | if (req->opcode == IORING_OP_POLL_ADD) | |
5075 | return &req->poll; | |
5076 | return &req->apoll->poll; | |
5077 | } | |
5078 | ||
5079 | static void io_poll_remove_double(struct io_kiocb *req) | |
e07785b0 | 5080 | __must_hold(&req->ctx->completion_lock) |
d4e7cd36 JA |
5081 | { |
5082 | struct io_poll_iocb *poll = io_poll_get_double(req); | |
18bceab1 JA |
5083 | |
5084 | lockdep_assert_held(&req->ctx->completion_lock); | |
5085 | ||
5086 | if (poll && poll->head) { | |
5087 | struct wait_queue_head *head = poll->head; | |
5088 | ||
79ebeaee | 5089 | spin_lock_irq(&head->lock); |
18bceab1 JA |
5090 | list_del_init(&poll->wait.entry); |
5091 | if (poll->wait.private) | |
de9b4cca | 5092 | req_ref_put(req); |
18bceab1 | 5093 | poll->head = NULL; |
79ebeaee | 5094 | spin_unlock_irq(&head->lock); |
18bceab1 JA |
5095 | } |
5096 | } | |
5097 | ||
e27414be | 5098 | static bool io_poll_complete(struct io_kiocb *req, __poll_t mask) |
e07785b0 | 5099 | __must_hold(&req->ctx->completion_lock) |
18bceab1 JA |
5100 | { |
5101 | struct io_ring_ctx *ctx = req->ctx; | |
88e41cf9 | 5102 | unsigned flags = IORING_CQE_F_MORE; |
e27414be | 5103 | int error; |
18bceab1 | 5104 | |
e27414be | 5105 | if (READ_ONCE(req->poll.canceled)) { |
45ab03b1 | 5106 | error = -ECANCELED; |
88e41cf9 | 5107 | req->poll.events |= EPOLLONESHOT; |
e27414be | 5108 | } else { |
5082620f | 5109 | error = mangle_poll(mask); |
e27414be | 5110 | } |
b69de288 JA |
5111 | if (req->poll.events & EPOLLONESHOT) |
5112 | flags = 0; | |
d4d19c19 | 5113 | if (!io_cqring_fill_event(ctx, req->user_data, error, flags)) { |
88e41cf9 JA |
5114 | req->poll.done = true; |
5115 | flags = 0; | |
5116 | } | |
7b289c38 HX |
5117 | if (flags & IORING_CQE_F_MORE) |
5118 | ctx->cq_extra++; | |
18bceab1 | 5119 | |
18bceab1 | 5120 | io_commit_cqring(ctx); |
88e41cf9 | 5121 | return !(flags & IORING_CQE_F_MORE); |
18bceab1 JA |
5122 | } |
5123 | ||
f237c30a | 5124 | static void io_poll_task_func(struct io_kiocb *req, bool *locked) |
18bceab1 JA |
5125 | { |
5126 | struct io_ring_ctx *ctx = req->ctx; | |
dd221f46 | 5127 | struct io_kiocb *nxt; |
18bceab1 JA |
5128 | |
5129 | if (io_poll_rewait(req, &req->poll)) { | |
79ebeaee | 5130 | spin_unlock(&ctx->completion_lock); |
dd221f46 | 5131 | } else { |
f40b964a | 5132 | bool done; |
18bceab1 | 5133 | |
e27414be | 5134 | done = io_poll_complete(req, req->result); |
88e41cf9 | 5135 | if (done) { |
a890d01e | 5136 | io_poll_remove_double(req); |
88e41cf9 | 5137 | hash_del(&req->hash_node); |
f40b964a | 5138 | } else { |
88e41cf9 JA |
5139 | req->result = 0; |
5140 | add_wait_queue(req->poll.head, &req->poll.wait); | |
5141 | } | |
79ebeaee | 5142 | spin_unlock(&ctx->completion_lock); |
dd221f46 | 5143 | io_cqring_ev_posted(ctx); |
18bceab1 | 5144 | |
88e41cf9 JA |
5145 | if (done) { |
5146 | nxt = io_put_req_find_next(req); | |
5147 | if (nxt) | |
f237c30a | 5148 | io_req_task_submit(nxt, locked); |
88e41cf9 | 5149 | } |
dd221f46 | 5150 | } |
18bceab1 JA |
5151 | } |
5152 | ||
5153 | static int io_poll_double_wake(struct wait_queue_entry *wait, unsigned mode, | |
5154 | int sync, void *key) | |
5155 | { | |
5156 | struct io_kiocb *req = wait->private; | |
d4e7cd36 | 5157 | struct io_poll_iocb *poll = io_poll_get_single(req); |
18bceab1 | 5158 | __poll_t mask = key_to_poll(key); |
79ebeaee | 5159 | unsigned long flags; |
18bceab1 JA |
5160 | |
5161 | /* for instances that support it check for an event match first: */ | |
5162 | if (mask && !(mask & poll->events)) | |
5163 | return 0; | |
88e41cf9 JA |
5164 | if (!(poll->events & EPOLLONESHOT)) |
5165 | return poll->wait.func(&poll->wait, mode, sync, key); | |
18bceab1 | 5166 | |
8706e04e JA |
5167 | list_del_init(&wait->entry); |
5168 | ||
9ce85ef2 | 5169 | if (poll->head) { |
18bceab1 JA |
5170 | bool done; |
5171 | ||
79ebeaee | 5172 | spin_lock_irqsave(&poll->head->lock, flags); |
807abcb0 | 5173 | done = list_empty(&poll->wait.entry); |
18bceab1 | 5174 | if (!done) |
807abcb0 | 5175 | list_del_init(&poll->wait.entry); |
d4e7cd36 JA |
5176 | /* make sure double remove sees this as being gone */ |
5177 | wait->private = NULL; | |
79ebeaee | 5178 | spin_unlock_irqrestore(&poll->head->lock, flags); |
c8b5e260 JA |
5179 | if (!done) { |
5180 | /* use wait func handler, so it matches the rq type */ | |
5181 | poll->wait.func(&poll->wait, mode, sync, key); | |
5182 | } | |
18bceab1 | 5183 | } |
de9b4cca | 5184 | req_ref_put(req); |
18bceab1 JA |
5185 | return 1; |
5186 | } | |
5187 | ||
5188 | static void io_init_poll_iocb(struct io_poll_iocb *poll, __poll_t events, | |
5189 | wait_queue_func_t wake_func) | |
5190 | { | |
5191 | poll->head = NULL; | |
5192 | poll->done = false; | |
5193 | poll->canceled = false; | |
464dca61 JA |
5194 | #define IO_POLL_UNMASK (EPOLLERR|EPOLLHUP|EPOLLNVAL|EPOLLRDHUP) |
5195 | /* mask in events that we always want/need */ | |
5196 | poll->events = events | IO_POLL_UNMASK; | |
18bceab1 JA |
5197 | INIT_LIST_HEAD(&poll->wait.entry); |
5198 | init_waitqueue_func_entry(&poll->wait, wake_func); | |
5199 | } | |
5200 | ||
5201 | static void __io_queue_proc(struct io_poll_iocb *poll, struct io_poll_table *pt, | |
807abcb0 JA |
5202 | struct wait_queue_head *head, |
5203 | struct io_poll_iocb **poll_ptr) | |
18bceab1 JA |
5204 | { |
5205 | struct io_kiocb *req = pt->req; | |
5206 | ||
5207 | /* | |
68b11e8b PB |
5208 | * The file being polled uses multiple waitqueues for poll handling |
5209 | * (e.g. one for read, one for write). Setup a separate io_poll_iocb | |
5210 | * if this happens. | |
18bceab1 | 5211 | */ |
68b11e8b | 5212 | if (unlikely(pt->nr_entries)) { |
58852d4d PB |
5213 | struct io_poll_iocb *poll_one = poll; |
5214 | ||
23a65db8 PB |
5215 | /* double add on the same waitqueue head, ignore */ |
5216 | if (poll_one->head == head) | |
5217 | return; | |
18bceab1 | 5218 | /* already have a 2nd entry, fail a third attempt */ |
807abcb0 | 5219 | if (*poll_ptr) { |
23a65db8 PB |
5220 | if ((*poll_ptr)->head == head) |
5221 | return; | |
18bceab1 JA |
5222 | pt->error = -EINVAL; |
5223 | return; | |
5224 | } | |
ea6a693d JA |
5225 | /* |
5226 | * Can't handle multishot for double wait for now, turn it | |
5227 | * into one-shot mode. | |
5228 | */ | |
7a274727 PB |
5229 | if (!(poll_one->events & EPOLLONESHOT)) |
5230 | poll_one->events |= EPOLLONESHOT; | |
18bceab1 JA |
5231 | poll = kmalloc(sizeof(*poll), GFP_ATOMIC); |
5232 | if (!poll) { | |
5233 | pt->error = -ENOMEM; | |
5234 | return; | |
5235 | } | |
58852d4d | 5236 | io_init_poll_iocb(poll, poll_one->events, io_poll_double_wake); |
de9b4cca | 5237 | req_ref_get(req); |
18bceab1 | 5238 | poll->wait.private = req; |
807abcb0 | 5239 | *poll_ptr = poll; |
18bceab1 JA |
5240 | } |
5241 | ||
68b11e8b | 5242 | pt->nr_entries++; |
18bceab1 | 5243 | poll->head = head; |
a31eb4a2 JX |
5244 | |
5245 | if (poll->events & EPOLLEXCLUSIVE) | |
5246 | add_wait_queue_exclusive(head, &poll->wait); | |
5247 | else | |
5248 | add_wait_queue(head, &poll->wait); | |
18bceab1 JA |
5249 | } |
5250 | ||
5251 | static void io_async_queue_proc(struct file *file, struct wait_queue_head *head, | |
5252 | struct poll_table_struct *p) | |
5253 | { | |
5254 | struct io_poll_table *pt = container_of(p, struct io_poll_table, pt); | |
807abcb0 | 5255 | struct async_poll *apoll = pt->req->apoll; |
18bceab1 | 5256 | |
807abcb0 | 5257 | __io_queue_proc(&apoll->poll, pt, head, &apoll->double_poll); |
18bceab1 JA |
5258 | } |
5259 | ||
f237c30a | 5260 | static void io_async_task_func(struct io_kiocb *req, bool *locked) |
d7718a9d | 5261 | { |
d7718a9d JA |
5262 | struct async_poll *apoll = req->apoll; |
5263 | struct io_ring_ctx *ctx = req->ctx; | |
5264 | ||
236daeae | 5265 | trace_io_uring_task_run(req->ctx, req, req->opcode, req->user_data); |
d7718a9d | 5266 | |
74ce6ce4 | 5267 | if (io_poll_rewait(req, &apoll->poll)) { |
79ebeaee | 5268 | spin_unlock(&ctx->completion_lock); |
74ce6ce4 | 5269 | return; |
d7718a9d JA |
5270 | } |
5271 | ||
0ea13b44 | 5272 | hash_del(&req->hash_node); |
d4e7cd36 | 5273 | io_poll_remove_double(req); |
79ebeaee | 5274 | spin_unlock(&ctx->completion_lock); |
74ce6ce4 | 5275 | |
0be0b0e3 | 5276 | if (!READ_ONCE(apoll->poll.canceled)) |
f237c30a | 5277 | io_req_task_submit(req, locked); |
0be0b0e3 | 5278 | else |
2593553a | 5279 | io_req_complete_failed(req, -ECANCELED); |
d7718a9d JA |
5280 | } |
5281 | ||
5282 | static int io_async_wake(struct wait_queue_entry *wait, unsigned mode, int sync, | |
5283 | void *key) | |
5284 | { | |
5285 | struct io_kiocb *req = wait->private; | |
5286 | struct io_poll_iocb *poll = &req->apoll->poll; | |
5287 | ||
5288 | trace_io_uring_poll_wake(req->ctx, req->opcode, req->user_data, | |
5289 | key_to_poll(key)); | |
5290 | ||
5291 | return __io_async_wake(req, poll, key_to_poll(key), io_async_task_func); | |
5292 | } | |
5293 | ||
5294 | static void io_poll_req_insert(struct io_kiocb *req) | |
5295 | { | |
5296 | struct io_ring_ctx *ctx = req->ctx; | |
5297 | struct hlist_head *list; | |
5298 | ||
5299 | list = &ctx->cancel_hash[hash_long(req->user_data, ctx->cancel_hash_bits)]; | |
5300 | hlist_add_head(&req->hash_node, list); | |
5301 | } | |
5302 | ||
5303 | static __poll_t __io_arm_poll_handler(struct io_kiocb *req, | |
5304 | struct io_poll_iocb *poll, | |
5305 | struct io_poll_table *ipt, __poll_t mask, | |
5306 | wait_queue_func_t wake_func) | |
5307 | __acquires(&ctx->completion_lock) | |
5308 | { | |
5309 | struct io_ring_ctx *ctx = req->ctx; | |
5310 | bool cancel = false; | |
5311 | ||
4d52f338 | 5312 | INIT_HLIST_NODE(&req->hash_node); |
18bceab1 | 5313 | io_init_poll_iocb(poll, mask, wake_func); |
b90cd197 | 5314 | poll->file = req->file; |
18bceab1 | 5315 | poll->wait.private = req; |
d7718a9d JA |
5316 | |
5317 | ipt->pt._key = mask; | |
5318 | ipt->req = req; | |
68b11e8b PB |
5319 | ipt->error = 0; |
5320 | ipt->nr_entries = 0; | |
d7718a9d | 5321 | |
d7718a9d | 5322 | mask = vfs_poll(req->file, &ipt->pt) & poll->events; |
68b11e8b PB |
5323 | if (unlikely(!ipt->nr_entries) && !ipt->error) |
5324 | ipt->error = -EINVAL; | |
d7718a9d | 5325 | |
79ebeaee | 5326 | spin_lock(&ctx->completion_lock); |
a890d01e | 5327 | if (ipt->error || (mask && (poll->events & EPOLLONESHOT))) |
46fee9ab | 5328 | io_poll_remove_double(req); |
d7718a9d | 5329 | if (likely(poll->head)) { |
79ebeaee | 5330 | spin_lock_irq(&poll->head->lock); |
d7718a9d JA |
5331 | if (unlikely(list_empty(&poll->wait.entry))) { |
5332 | if (ipt->error) | |
5333 | cancel = true; | |
5334 | ipt->error = 0; | |
5335 | mask = 0; | |
5336 | } | |
88e41cf9 | 5337 | if ((mask && (poll->events & EPOLLONESHOT)) || ipt->error) |
d7718a9d JA |
5338 | list_del_init(&poll->wait.entry); |
5339 | else if (cancel) | |
5340 | WRITE_ONCE(poll->canceled, true); | |
5341 | else if (!poll->done) /* actually waiting for an event */ | |
5342 | io_poll_req_insert(req); | |
79ebeaee | 5343 | spin_unlock_irq(&poll->head->lock); |
d7718a9d JA |
5344 | } |
5345 | ||
5346 | return mask; | |
5347 | } | |
5348 | ||
59b735ae OL |
5349 | enum { |
5350 | IO_APOLL_OK, | |
5351 | IO_APOLL_ABORTED, | |
5352 | IO_APOLL_READY | |
5353 | }; | |
5354 | ||
5355 | static int io_arm_poll_handler(struct io_kiocb *req) | |
d7718a9d JA |
5356 | { |
5357 | const struct io_op_def *def = &io_op_defs[req->opcode]; | |
5358 | struct io_ring_ctx *ctx = req->ctx; | |
5359 | struct async_poll *apoll; | |
5360 | struct io_poll_table ipt; | |
b2d9c3da | 5361 | __poll_t ret, mask = EPOLLONESHOT | POLLERR | POLLPRI; |
9dab14b8 | 5362 | int rw; |
d7718a9d JA |
5363 | |
5364 | if (!req->file || !file_can_poll(req->file)) | |
59b735ae | 5365 | return IO_APOLL_ABORTED; |
24c74678 | 5366 | if (req->flags & REQ_F_POLLED) |
59b735ae | 5367 | return IO_APOLL_ABORTED; |
b2d9c3da PB |
5368 | if (!def->pollin && !def->pollout) |
5369 | return IO_APOLL_ABORTED; | |
5370 | ||
5371 | if (def->pollin) { | |
9dab14b8 | 5372 | rw = READ; |
b2d9c3da PB |
5373 | mask |= POLLIN | POLLRDNORM; |
5374 | ||
5375 | /* If reading from MSG_ERRQUEUE using recvmsg, ignore POLLIN */ | |
5376 | if ((req->opcode == IORING_OP_RECVMSG) && | |
5377 | (req->sr_msg.msg_flags & MSG_ERRQUEUE)) | |
5378 | mask &= ~POLLIN; | |
5379 | } else { | |
9dab14b8 | 5380 | rw = WRITE; |
b2d9c3da PB |
5381 | mask |= POLLOUT | POLLWRNORM; |
5382 | } | |
5383 | ||
9dab14b8 | 5384 | /* if we can't nonblock try, then no point in arming a poll handler */ |
b191e2df | 5385 | if (!io_file_supports_nowait(req, rw)) |
59b735ae | 5386 | return IO_APOLL_ABORTED; |
d7718a9d JA |
5387 | |
5388 | apoll = kmalloc(sizeof(*apoll), GFP_ATOMIC); | |
5389 | if (unlikely(!apoll)) | |
59b735ae | 5390 | return IO_APOLL_ABORTED; |
807abcb0 | 5391 | apoll->double_poll = NULL; |
d7718a9d | 5392 | req->apoll = apoll; |
b2d9c3da | 5393 | req->flags |= REQ_F_POLLED; |
d7718a9d | 5394 | ipt.pt._qproc = io_async_queue_proc; |
48dcd38d | 5395 | io_req_set_refcount(req); |
d7718a9d JA |
5396 | |
5397 | ret = __io_arm_poll_handler(req, &apoll->poll, &ipt, mask, | |
5398 | io_async_wake); | |
79ebeaee | 5399 | spin_unlock(&ctx->completion_lock); |
41a5169c HX |
5400 | if (ret || ipt.error) |
5401 | return ret ? IO_APOLL_READY : IO_APOLL_ABORTED; | |
5402 | ||
236daeae OL |
5403 | trace_io_uring_poll_arm(ctx, req, req->opcode, req->user_data, |
5404 | mask, apoll->poll.events); | |
59b735ae | 5405 | return IO_APOLL_OK; |
d7718a9d JA |
5406 | } |
5407 | ||
5408 | static bool __io_poll_remove_one(struct io_kiocb *req, | |
b2e720ac | 5409 | struct io_poll_iocb *poll, bool do_cancel) |
e07785b0 | 5410 | __must_hold(&req->ctx->completion_lock) |
221c5eb2 | 5411 | { |
b41e9852 | 5412 | bool do_complete = false; |
221c5eb2 | 5413 | |
5082620f JA |
5414 | if (!poll->head) |
5415 | return false; | |
79ebeaee | 5416 | spin_lock_irq(&poll->head->lock); |
b2e720ac JA |
5417 | if (do_cancel) |
5418 | WRITE_ONCE(poll->canceled, true); | |
392edb45 JA |
5419 | if (!list_empty(&poll->wait.entry)) { |
5420 | list_del_init(&poll->wait.entry); | |
b41e9852 | 5421 | do_complete = true; |
221c5eb2 | 5422 | } |
79ebeaee | 5423 | spin_unlock_irq(&poll->head->lock); |
3bfa5bcb | 5424 | hash_del(&req->hash_node); |
d7718a9d JA |
5425 | return do_complete; |
5426 | } | |
5427 | ||
5d709043 | 5428 | static bool io_poll_remove_one(struct io_kiocb *req) |
e07785b0 | 5429 | __must_hold(&req->ctx->completion_lock) |
d7718a9d JA |
5430 | { |
5431 | bool do_complete; | |
5432 | ||
d4e7cd36 | 5433 | io_poll_remove_double(req); |
e31001a3 | 5434 | do_complete = __io_poll_remove_one(req, io_poll_get_single(req), true); |
d4e7cd36 | 5435 | |
b41e9852 | 5436 | if (do_complete) { |
d4d19c19 | 5437 | io_cqring_fill_event(req->ctx, req->user_data, -ECANCELED, 0); |
b41e9852 | 5438 | io_commit_cqring(req->ctx); |
93d2bcd2 | 5439 | req_set_fail(req); |
91c2f697 | 5440 | io_put_req_deferred(req); |
5d709043 | 5441 | } |
b41e9852 | 5442 | return do_complete; |
221c5eb2 JA |
5443 | } |
5444 | ||
76e1b642 JA |
5445 | /* |
5446 | * Returns true if we found and killed one or more poll requests | |
5447 | */ | |
6b81928d | 5448 | static bool io_poll_remove_all(struct io_ring_ctx *ctx, struct task_struct *tsk, |
3dd0c97a | 5449 | bool cancel_all) |
221c5eb2 | 5450 | { |
78076bb6 | 5451 | struct hlist_node *tmp; |
221c5eb2 | 5452 | struct io_kiocb *req; |
8e2e1faf | 5453 | int posted = 0, i; |
221c5eb2 | 5454 | |
79ebeaee | 5455 | spin_lock(&ctx->completion_lock); |
78076bb6 JA |
5456 | for (i = 0; i < (1U << ctx->cancel_hash_bits); i++) { |
5457 | struct hlist_head *list; | |
5458 | ||
5459 | list = &ctx->cancel_hash[i]; | |
f3606e3a | 5460 | hlist_for_each_entry_safe(req, tmp, list, hash_node) { |
3dd0c97a | 5461 | if (io_match_task(req, tsk, cancel_all)) |
f3606e3a JA |
5462 | posted += io_poll_remove_one(req); |
5463 | } | |
221c5eb2 | 5464 | } |
79ebeaee | 5465 | spin_unlock(&ctx->completion_lock); |
b41e9852 | 5466 | |
8e2e1faf JA |
5467 | if (posted) |
5468 | io_cqring_ev_posted(ctx); | |
76e1b642 JA |
5469 | |
5470 | return posted != 0; | |
221c5eb2 JA |
5471 | } |
5472 | ||
9ba5fac8 PB |
5473 | static struct io_kiocb *io_poll_find(struct io_ring_ctx *ctx, __u64 sqe_addr, |
5474 | bool poll_only) | |
e07785b0 | 5475 | __must_hold(&ctx->completion_lock) |
47f46768 | 5476 | { |
78076bb6 | 5477 | struct hlist_head *list; |
47f46768 JA |
5478 | struct io_kiocb *req; |
5479 | ||
78076bb6 JA |
5480 | list = &ctx->cancel_hash[hash_long(sqe_addr, ctx->cancel_hash_bits)]; |
5481 | hlist_for_each_entry(req, list, hash_node) { | |
b41e9852 JA |
5482 | if (sqe_addr != req->user_data) |
5483 | continue; | |
9ba5fac8 PB |
5484 | if (poll_only && req->opcode != IORING_OP_POLL_ADD) |
5485 | continue; | |
b2cb805f | 5486 | return req; |
47f46768 | 5487 | } |
b2cb805f JA |
5488 | return NULL; |
5489 | } | |
5490 | ||
9ba5fac8 PB |
5491 | static int io_poll_cancel(struct io_ring_ctx *ctx, __u64 sqe_addr, |
5492 | bool poll_only) | |
e07785b0 | 5493 | __must_hold(&ctx->completion_lock) |
b2cb805f JA |
5494 | { |
5495 | struct io_kiocb *req; | |
5496 | ||
9ba5fac8 | 5497 | req = io_poll_find(ctx, sqe_addr, poll_only); |
b2cb805f JA |
5498 | if (!req) |
5499 | return -ENOENT; | |
5500 | if (io_poll_remove_one(req)) | |
5501 | return 0; | |
5502 | ||
5503 | return -EALREADY; | |
47f46768 JA |
5504 | } |
5505 | ||
9096af3e PB |
5506 | static __poll_t io_poll_parse_events(const struct io_uring_sqe *sqe, |
5507 | unsigned int flags) | |
5508 | { | |
5509 | u32 events; | |
47f46768 | 5510 | |
9096af3e PB |
5511 | events = READ_ONCE(sqe->poll32_events); |
5512 | #ifdef __BIG_ENDIAN | |
5513 | events = swahw32(events); | |
5514 | #endif | |
5515 | if (!(flags & IORING_POLL_ADD_MULTI)) | |
5516 | events |= EPOLLONESHOT; | |
5517 | return demangle_poll(events) | (events & (EPOLLEXCLUSIVE|EPOLLONESHOT)); | |
47f46768 JA |
5518 | } |
5519 | ||
c5de0036 | 5520 | static int io_poll_update_prep(struct io_kiocb *req, |
3529d8c2 | 5521 | const struct io_uring_sqe *sqe) |
0969e783 | 5522 | { |
c5de0036 PB |
5523 | struct io_poll_update *upd = &req->poll_update; |
5524 | u32 flags; | |
5525 | ||
0969e783 JA |
5526 | if (unlikely(req->ctx->flags & IORING_SETUP_IOPOLL)) |
5527 | return -EINVAL; | |
26578cda | 5528 | if (sqe->ioprio || sqe->buf_index || sqe->splice_fd_in) |
c5de0036 PB |
5529 | return -EINVAL; |
5530 | flags = READ_ONCE(sqe->len); | |
5531 | if (flags & ~(IORING_POLL_UPDATE_EVENTS | IORING_POLL_UPDATE_USER_DATA | | |
5532 | IORING_POLL_ADD_MULTI)) | |
5533 | return -EINVAL; | |
5534 | /* meaningless without update */ | |
5535 | if (flags == IORING_POLL_ADD_MULTI) | |
0969e783 JA |
5536 | return -EINVAL; |
5537 | ||
c5de0036 PB |
5538 | upd->old_user_data = READ_ONCE(sqe->addr); |
5539 | upd->update_events = flags & IORING_POLL_UPDATE_EVENTS; | |
5540 | upd->update_user_data = flags & IORING_POLL_UPDATE_USER_DATA; | |
221c5eb2 | 5541 | |
c5de0036 PB |
5542 | upd->new_user_data = READ_ONCE(sqe->off); |
5543 | if (!upd->update_user_data && upd->new_user_data) | |
5544 | return -EINVAL; | |
5545 | if (upd->update_events) | |
5546 | upd->events = io_poll_parse_events(sqe, flags); | |
5547 | else if (sqe->poll32_events) | |
5548 | return -EINVAL; | |
221c5eb2 | 5549 | |
221c5eb2 JA |
5550 | return 0; |
5551 | } | |
5552 | ||
221c5eb2 JA |
5553 | static int io_poll_wake(struct wait_queue_entry *wait, unsigned mode, int sync, |
5554 | void *key) | |
5555 | { | |
c2f2eb7d JA |
5556 | struct io_kiocb *req = wait->private; |
5557 | struct io_poll_iocb *poll = &req->poll; | |
221c5eb2 | 5558 | |
d7718a9d | 5559 | return __io_async_wake(req, poll, key_to_poll(key), io_poll_task_func); |
221c5eb2 JA |
5560 | } |
5561 | ||
221c5eb2 JA |
5562 | static void io_poll_queue_proc(struct file *file, struct wait_queue_head *head, |
5563 | struct poll_table_struct *p) | |
5564 | { | |
5565 | struct io_poll_table *pt = container_of(p, struct io_poll_table, pt); | |
5566 | ||
e8c2bc1f | 5567 | __io_queue_proc(&pt->req->poll, pt, head, (struct io_poll_iocb **) &pt->req->async_data); |
eac406c6 JA |
5568 | } |
5569 | ||
3529d8c2 | 5570 | static int io_poll_add_prep(struct io_kiocb *req, const struct io_uring_sqe *sqe) |
221c5eb2 JA |
5571 | { |
5572 | struct io_poll_iocb *poll = &req->poll; | |
c5de0036 | 5573 | u32 flags; |
221c5eb2 JA |
5574 | |
5575 | if (unlikely(req->ctx->flags & IORING_SETUP_IOPOLL)) | |
5576 | return -EINVAL; | |
c5de0036 | 5577 | if (sqe->ioprio || sqe->buf_index || sqe->off || sqe->addr) |
88e41cf9 JA |
5578 | return -EINVAL; |
5579 | flags = READ_ONCE(sqe->len); | |
c5de0036 | 5580 | if (flags & ~IORING_POLL_ADD_MULTI) |
221c5eb2 JA |
5581 | return -EINVAL; |
5582 | ||
48dcd38d | 5583 | io_req_set_refcount(req); |
c5de0036 | 5584 | poll->events = io_poll_parse_events(sqe, flags); |
0969e783 JA |
5585 | return 0; |
5586 | } | |
5587 | ||
61e98203 | 5588 | static int io_poll_add(struct io_kiocb *req, unsigned int issue_flags) |
0969e783 JA |
5589 | { |
5590 | struct io_poll_iocb *poll = &req->poll; | |
5591 | struct io_ring_ctx *ctx = req->ctx; | |
5592 | struct io_poll_table ipt; | |
0969e783 | 5593 | __poll_t mask; |
0969e783 | 5594 | |
d7718a9d | 5595 | ipt.pt._qproc = io_poll_queue_proc; |
36703247 | 5596 | |
d7718a9d JA |
5597 | mask = __io_arm_poll_handler(req, &req->poll, &ipt, poll->events, |
5598 | io_poll_wake); | |
221c5eb2 | 5599 | |
8c838788 | 5600 | if (mask) { /* no async, we'd stolen it */ |
221c5eb2 | 5601 | ipt.error = 0; |
e27414be | 5602 | io_poll_complete(req, mask); |
221c5eb2 | 5603 | } |
79ebeaee | 5604 | spin_unlock(&ctx->completion_lock); |
221c5eb2 | 5605 | |
8c838788 JA |
5606 | if (mask) { |
5607 | io_cqring_ev_posted(ctx); | |
88e41cf9 JA |
5608 | if (poll->events & EPOLLONESHOT) |
5609 | io_put_req(req); | |
221c5eb2 | 5610 | } |
8c838788 | 5611 | return ipt.error; |
221c5eb2 JA |
5612 | } |
5613 | ||
c5de0036 | 5614 | static int io_poll_update(struct io_kiocb *req, unsigned int issue_flags) |
b69de288 JA |
5615 | { |
5616 | struct io_ring_ctx *ctx = req->ctx; | |
5617 | struct io_kiocb *preq; | |
cb3b200e | 5618 | bool completing; |
b69de288 JA |
5619 | int ret; |
5620 | ||
79ebeaee | 5621 | spin_lock(&ctx->completion_lock); |
9ba5fac8 | 5622 | preq = io_poll_find(ctx, req->poll_update.old_user_data, true); |
b69de288 JA |
5623 | if (!preq) { |
5624 | ret = -ENOENT; | |
5625 | goto err; | |
b69de288 | 5626 | } |
cb3b200e | 5627 | |
c5de0036 PB |
5628 | if (!req->poll_update.update_events && !req->poll_update.update_user_data) { |
5629 | completing = true; | |
5630 | ret = io_poll_remove_one(preq) ? 0 : -EALREADY; | |
5631 | goto err; | |
5632 | } | |
5633 | ||
cb3b200e JA |
5634 | /* |
5635 | * Don't allow racy completion with singleshot, as we cannot safely | |
5636 | * update those. For multishot, if we're racing with completion, just | |
5637 | * let completion re-add it. | |
5638 | */ | |
5639 | completing = !__io_poll_remove_one(preq, &preq->poll, false); | |
5640 | if (completing && (preq->poll.events & EPOLLONESHOT)) { | |
5641 | ret = -EALREADY; | |
5642 | goto err; | |
b69de288 JA |
5643 | } |
5644 | /* we now have a detached poll request. reissue. */ | |
5645 | ret = 0; | |
5646 | err: | |
b69de288 | 5647 | if (ret < 0) { |
79ebeaee | 5648 | spin_unlock(&ctx->completion_lock); |
93d2bcd2 | 5649 | req_set_fail(req); |
b69de288 JA |
5650 | io_req_complete(req, ret); |
5651 | return 0; | |
5652 | } | |
5653 | /* only mask one event flags, keep behavior flags */ | |
9d805892 | 5654 | if (req->poll_update.update_events) { |
b69de288 | 5655 | preq->poll.events &= ~0xffff; |
9d805892 | 5656 | preq->poll.events |= req->poll_update.events & 0xffff; |
b69de288 JA |
5657 | preq->poll.events |= IO_POLL_UNMASK; |
5658 | } | |
9d805892 PB |
5659 | if (req->poll_update.update_user_data) |
5660 | preq->user_data = req->poll_update.new_user_data; | |
79ebeaee | 5661 | spin_unlock(&ctx->completion_lock); |
cb3b200e | 5662 | |
b69de288 JA |
5663 | /* complete update request, we're done with it */ |
5664 | io_req_complete(req, ret); | |
5665 | ||
cb3b200e | 5666 | if (!completing) { |
c5de0036 | 5667 | ret = io_poll_add(preq, issue_flags); |
cb3b200e | 5668 | if (ret < 0) { |
93d2bcd2 | 5669 | req_set_fail(preq); |
cb3b200e JA |
5670 | io_req_complete(preq, ret); |
5671 | } | |
b69de288 JA |
5672 | } |
5673 | return 0; | |
5674 | } | |
5675 | ||
f237c30a | 5676 | static void io_req_task_timeout(struct io_kiocb *req, bool *locked) |
89850fce | 5677 | { |
89850fce | 5678 | req_set_fail(req); |
505657bc | 5679 | io_req_complete_post(req, -ETIME, 0); |
89850fce JA |
5680 | } |
5681 | ||
5262f567 JA |
5682 | static enum hrtimer_restart io_timeout_fn(struct hrtimer *timer) |
5683 | { | |
ad8a48ac JA |
5684 | struct io_timeout_data *data = container_of(timer, |
5685 | struct io_timeout_data, timer); | |
5686 | struct io_kiocb *req = data->req; | |
5687 | struct io_ring_ctx *ctx = req->ctx; | |
5262f567 JA |
5688 | unsigned long flags; |
5689 | ||
89850fce | 5690 | spin_lock_irqsave(&ctx->timeout_lock, flags); |
a71976f3 | 5691 | list_del_init(&req->timeout.list); |
01cec8c1 PB |
5692 | atomic_set(&req->ctx->cq_timeouts, |
5693 | atomic_read(&req->ctx->cq_timeouts) + 1); | |
89850fce | 5694 | spin_unlock_irqrestore(&ctx->timeout_lock, flags); |
01cec8c1 | 5695 | |
89850fce JA |
5696 | req->io_task_work.func = io_req_task_timeout; |
5697 | io_req_task_work_add(req); | |
5262f567 JA |
5698 | return HRTIMER_NORESTART; |
5699 | } | |
5700 | ||
fbd15848 PB |
5701 | static struct io_kiocb *io_timeout_extract(struct io_ring_ctx *ctx, |
5702 | __u64 user_data) | |
89850fce | 5703 | __must_hold(&ctx->timeout_lock) |
f254ac04 | 5704 | { |
fbd15848 | 5705 | struct io_timeout_data *io; |
47f46768 | 5706 | struct io_kiocb *req; |
fd9c7bc5 | 5707 | bool found = false; |
f254ac04 | 5708 | |
135fcde8 | 5709 | list_for_each_entry(req, &ctx->timeout_list, timeout.list) { |
fd9c7bc5 PB |
5710 | found = user_data == req->user_data; |
5711 | if (found) | |
47f46768 | 5712 | break; |
47f46768 | 5713 | } |
fd9c7bc5 PB |
5714 | if (!found) |
5715 | return ERR_PTR(-ENOENT); | |
fbd15848 PB |
5716 | |
5717 | io = req->async_data; | |
fd9c7bc5 | 5718 | if (hrtimer_try_to_cancel(&io->timer) == -1) |
fbd15848 | 5719 | return ERR_PTR(-EALREADY); |
a71976f3 | 5720 | list_del_init(&req->timeout.list); |
fbd15848 PB |
5721 | return req; |
5722 | } | |
47f46768 | 5723 | |
fbd15848 | 5724 | static int io_timeout_cancel(struct io_ring_ctx *ctx, __u64 user_data) |
ec3c3d0f | 5725 | __must_hold(&ctx->completion_lock) |
89850fce | 5726 | __must_hold(&ctx->timeout_lock) |
fbd15848 PB |
5727 | { |
5728 | struct io_kiocb *req = io_timeout_extract(ctx, user_data); | |
5729 | ||
5730 | if (IS_ERR(req)) | |
5731 | return PTR_ERR(req); | |
f254ac04 | 5732 | |
93d2bcd2 | 5733 | req_set_fail(req); |
d4d19c19 | 5734 | io_cqring_fill_event(ctx, req->user_data, -ECANCELED, 0); |
91c2f697 | 5735 | io_put_req_deferred(req); |
f254ac04 JA |
5736 | return 0; |
5737 | } | |
5738 | ||
50c1df2b JA |
5739 | static clockid_t io_timeout_get_clock(struct io_timeout_data *data) |
5740 | { | |
5741 | switch (data->flags & IORING_TIMEOUT_CLOCK_MASK) { | |
5742 | case IORING_TIMEOUT_BOOTTIME: | |
5743 | return CLOCK_BOOTTIME; | |
5744 | case IORING_TIMEOUT_REALTIME: | |
5745 | return CLOCK_REALTIME; | |
5746 | default: | |
5747 | /* can't happen, vetted at prep time */ | |
5748 | WARN_ON_ONCE(1); | |
5749 | fallthrough; | |
5750 | case 0: | |
5751 | return CLOCK_MONOTONIC; | |
5752 | } | |
5753 | } | |
5754 | ||
f1042b6c PB |
5755 | static int io_linked_timeout_update(struct io_ring_ctx *ctx, __u64 user_data, |
5756 | struct timespec64 *ts, enum hrtimer_mode mode) | |
5757 | __must_hold(&ctx->timeout_lock) | |
5758 | { | |
5759 | struct io_timeout_data *io; | |
5760 | struct io_kiocb *req; | |
5761 | bool found = false; | |
5762 | ||
5763 | list_for_each_entry(req, &ctx->ltimeout_list, timeout.list) { | |
5764 | found = user_data == req->user_data; | |
5765 | if (found) | |
5766 | break; | |
5767 | } | |
5768 | if (!found) | |
5769 | return -ENOENT; | |
5770 | ||
5771 | io = req->async_data; | |
5772 | if (hrtimer_try_to_cancel(&io->timer) == -1) | |
5773 | return -EALREADY; | |
5774 | hrtimer_init(&io->timer, io_timeout_get_clock(io), mode); | |
5775 | io->timer.function = io_link_timeout_fn; | |
5776 | hrtimer_start(&io->timer, timespec64_to_ktime(*ts), mode); | |
5777 | return 0; | |
5778 | } | |
5779 | ||
9c8e11b3 PB |
5780 | static int io_timeout_update(struct io_ring_ctx *ctx, __u64 user_data, |
5781 | struct timespec64 *ts, enum hrtimer_mode mode) | |
89850fce | 5782 | __must_hold(&ctx->timeout_lock) |
47f46768 | 5783 | { |
9c8e11b3 PB |
5784 | struct io_kiocb *req = io_timeout_extract(ctx, user_data); |
5785 | struct io_timeout_data *data; | |
47f46768 | 5786 | |
9c8e11b3 PB |
5787 | if (IS_ERR(req)) |
5788 | return PTR_ERR(req); | |
47f46768 | 5789 | |
9c8e11b3 PB |
5790 | req->timeout.off = 0; /* noseq */ |
5791 | data = req->async_data; | |
5792 | list_add_tail(&req->timeout.list, &ctx->timeout_list); | |
50c1df2b | 5793 | hrtimer_init(&data->timer, io_timeout_get_clock(data), mode); |
9c8e11b3 PB |
5794 | data->timer.function = io_timeout_fn; |
5795 | hrtimer_start(&data->timer, timespec64_to_ktime(*ts), mode); | |
5796 | return 0; | |
47f46768 JA |
5797 | } |
5798 | ||
3529d8c2 JA |
5799 | static int io_timeout_remove_prep(struct io_kiocb *req, |
5800 | const struct io_uring_sqe *sqe) | |
b29472ee | 5801 | { |
9c8e11b3 PB |
5802 | struct io_timeout_rem *tr = &req->timeout_rem; |
5803 | ||
b29472ee JA |
5804 | if (unlikely(req->ctx->flags & IORING_SETUP_IOPOLL)) |
5805 | return -EINVAL; | |
61710e43 DA |
5806 | if (unlikely(req->flags & (REQ_F_FIXED_FILE | REQ_F_BUFFER_SELECT))) |
5807 | return -EINVAL; | |
26578cda | 5808 | if (sqe->ioprio || sqe->buf_index || sqe->len || sqe->splice_fd_in) |
b29472ee JA |
5809 | return -EINVAL; |
5810 | ||
f1042b6c | 5811 | tr->ltimeout = false; |
9c8e11b3 PB |
5812 | tr->addr = READ_ONCE(sqe->addr); |
5813 | tr->flags = READ_ONCE(sqe->timeout_flags); | |
f1042b6c PB |
5814 | if (tr->flags & IORING_TIMEOUT_UPDATE_MASK) { |
5815 | if (hweight32(tr->flags & IORING_TIMEOUT_CLOCK_MASK) > 1) | |
5816 | return -EINVAL; | |
5817 | if (tr->flags & IORING_LINK_TIMEOUT_UPDATE) | |
5818 | tr->ltimeout = true; | |
5819 | if (tr->flags & ~(IORING_TIMEOUT_UPDATE_MASK|IORING_TIMEOUT_ABS)) | |
9c8e11b3 PB |
5820 | return -EINVAL; |
5821 | if (get_timespec64(&tr->ts, u64_to_user_ptr(sqe->addr2))) | |
5822 | return -EFAULT; | |
5823 | } else if (tr->flags) { | |
5824 | /* timeout removal doesn't support flags */ | |
b29472ee | 5825 | return -EINVAL; |
9c8e11b3 | 5826 | } |
b29472ee | 5827 | |
b29472ee JA |
5828 | return 0; |
5829 | } | |
5830 | ||
8662daec PB |
5831 | static inline enum hrtimer_mode io_translate_timeout_mode(unsigned int flags) |
5832 | { | |
5833 | return (flags & IORING_TIMEOUT_ABS) ? HRTIMER_MODE_ABS | |
5834 | : HRTIMER_MODE_REL; | |
5835 | } | |
5836 | ||
11365043 JA |
5837 | /* |
5838 | * Remove or update an existing timeout command | |
5839 | */ | |
61e98203 | 5840 | static int io_timeout_remove(struct io_kiocb *req, unsigned int issue_flags) |
11365043 | 5841 | { |
9c8e11b3 | 5842 | struct io_timeout_rem *tr = &req->timeout_rem; |
11365043 | 5843 | struct io_ring_ctx *ctx = req->ctx; |
47f46768 | 5844 | int ret; |
11365043 | 5845 | |
ec3c3d0f PB |
5846 | if (!(req->timeout_rem.flags & IORING_TIMEOUT_UPDATE)) { |
5847 | spin_lock(&ctx->completion_lock); | |
5848 | spin_lock_irq(&ctx->timeout_lock); | |
9c8e11b3 | 5849 | ret = io_timeout_cancel(ctx, tr->addr); |
ec3c3d0f PB |
5850 | spin_unlock_irq(&ctx->timeout_lock); |
5851 | spin_unlock(&ctx->completion_lock); | |
5852 | } else { | |
f1042b6c PB |
5853 | enum hrtimer_mode mode = io_translate_timeout_mode(tr->flags); |
5854 | ||
ec3c3d0f | 5855 | spin_lock_irq(&ctx->timeout_lock); |
f1042b6c PB |
5856 | if (tr->ltimeout) |
5857 | ret = io_linked_timeout_update(ctx, tr->addr, &tr->ts, mode); | |
5858 | else | |
5859 | ret = io_timeout_update(ctx, tr->addr, &tr->ts, mode); | |
ec3c3d0f PB |
5860 | spin_unlock_irq(&ctx->timeout_lock); |
5861 | } | |
11365043 | 5862 | |
4e88d6e7 | 5863 | if (ret < 0) |
93d2bcd2 | 5864 | req_set_fail(req); |
505657bc | 5865 | io_req_complete_post(req, ret, 0); |
11365043 | 5866 | return 0; |
5262f567 JA |
5867 | } |
5868 | ||
3529d8c2 | 5869 | static int io_timeout_prep(struct io_kiocb *req, const struct io_uring_sqe *sqe, |
2d28390a | 5870 | bool is_timeout_link) |
5262f567 | 5871 | { |
ad8a48ac | 5872 | struct io_timeout_data *data; |
a41525ab | 5873 | unsigned flags; |
56080b02 | 5874 | u32 off = READ_ONCE(sqe->off); |
5262f567 | 5875 | |
ad8a48ac | 5876 | if (unlikely(req->ctx->flags & IORING_SETUP_IOPOLL)) |
5262f567 | 5877 | return -EINVAL; |
26578cda PB |
5878 | if (sqe->ioprio || sqe->buf_index || sqe->len != 1 || |
5879 | sqe->splice_fd_in) | |
a41525ab | 5880 | return -EINVAL; |
56080b02 | 5881 | if (off && is_timeout_link) |
2d28390a | 5882 | return -EINVAL; |
a41525ab | 5883 | flags = READ_ONCE(sqe->timeout_flags); |
50c1df2b JA |
5884 | if (flags & ~(IORING_TIMEOUT_ABS | IORING_TIMEOUT_CLOCK_MASK)) |
5885 | return -EINVAL; | |
5886 | /* more than one clock specified is invalid, obviously */ | |
5887 | if (hweight32(flags & IORING_TIMEOUT_CLOCK_MASK) > 1) | |
5262f567 | 5888 | return -EINVAL; |
bdf20073 | 5889 | |
ef9dd637 | 5890 | INIT_LIST_HEAD(&req->timeout.list); |
bfe68a22 | 5891 | req->timeout.off = off; |
f18ee4cf PB |
5892 | if (unlikely(off && !req->ctx->off_timeout_used)) |
5893 | req->ctx->off_timeout_used = true; | |
26a61679 | 5894 | |
e8c2bc1f | 5895 | if (!req->async_data && io_alloc_async_data(req)) |
26a61679 JA |
5896 | return -ENOMEM; |
5897 | ||
e8c2bc1f | 5898 | data = req->async_data; |
ad8a48ac | 5899 | data->req = req; |
50c1df2b | 5900 | data->flags = flags; |
ad8a48ac JA |
5901 | |
5902 | if (get_timespec64(&data->ts, u64_to_user_ptr(sqe->addr))) | |
5262f567 JA |
5903 | return -EFAULT; |
5904 | ||
8662daec | 5905 | data->mode = io_translate_timeout_mode(flags); |
50c1df2b | 5906 | hrtimer_init(&data->timer, io_timeout_get_clock(data), data->mode); |
b97e736a PB |
5907 | |
5908 | if (is_timeout_link) { | |
5909 | struct io_submit_link *link = &req->ctx->submit_state.link; | |
5910 | ||
5911 | if (!link->head) | |
5912 | return -EINVAL; | |
5913 | if (link->last->opcode == IORING_OP_LINK_TIMEOUT) | |
5914 | return -EINVAL; | |
4d13d1a4 PB |
5915 | req->timeout.head = link->last; |
5916 | link->last->flags |= REQ_F_ARM_LTIMEOUT; | |
b97e736a | 5917 | } |
ad8a48ac JA |
5918 | return 0; |
5919 | } | |
5920 | ||
61e98203 | 5921 | static int io_timeout(struct io_kiocb *req, unsigned int issue_flags) |
ad8a48ac | 5922 | { |
ad8a48ac | 5923 | struct io_ring_ctx *ctx = req->ctx; |
e8c2bc1f | 5924 | struct io_timeout_data *data = req->async_data; |
ad8a48ac | 5925 | struct list_head *entry; |
bfe68a22 | 5926 | u32 tail, off = req->timeout.off; |
ad8a48ac | 5927 | |
89850fce | 5928 | spin_lock_irq(&ctx->timeout_lock); |
93bd25bb | 5929 | |
5262f567 JA |
5930 | /* |
5931 | * sqe->off holds how many events that need to occur for this | |
93bd25bb JA |
5932 | * timeout event to be satisfied. If it isn't set, then this is |
5933 | * a pure timeout request, sequence isn't used. | |
5262f567 | 5934 | */ |
8eb7e2d0 | 5935 | if (io_is_timeout_noseq(req)) { |
93bd25bb JA |
5936 | entry = ctx->timeout_list.prev; |
5937 | goto add; | |
5938 | } | |
5262f567 | 5939 | |
bfe68a22 PB |
5940 | tail = ctx->cached_cq_tail - atomic_read(&ctx->cq_timeouts); |
5941 | req->timeout.target_seq = tail + off; | |
5262f567 | 5942 | |
f010505b MDG |
5943 | /* Update the last seq here in case io_flush_timeouts() hasn't. |
5944 | * This is safe because ->completion_lock is held, and submissions | |
5945 | * and completions are never mixed in the same ->completion_lock section. | |
5946 | */ | |
5947 | ctx->cq_last_tm_flush = tail; | |
5948 | ||
5262f567 JA |
5949 | /* |
5950 | * Insertion sort, ensuring the first entry in the list is always | |
5951 | * the one we need first. | |
5952 | */ | |
5262f567 | 5953 | list_for_each_prev(entry, &ctx->timeout_list) { |
135fcde8 PB |
5954 | struct io_kiocb *nxt = list_entry(entry, struct io_kiocb, |
5955 | timeout.list); | |
5262f567 | 5956 | |
8eb7e2d0 | 5957 | if (io_is_timeout_noseq(nxt)) |
93bd25bb | 5958 | continue; |
bfe68a22 PB |
5959 | /* nxt.seq is behind @tail, otherwise would've been completed */ |
5960 | if (off >= nxt->timeout.target_seq - tail) | |
5262f567 JA |
5961 | break; |
5962 | } | |
93bd25bb | 5963 | add: |
135fcde8 | 5964 | list_add(&req->timeout.list, entry); |
ad8a48ac JA |
5965 | data->timer.function = io_timeout_fn; |
5966 | hrtimer_start(&data->timer, timespec64_to_ktime(data->ts), data->mode); | |
89850fce | 5967 | spin_unlock_irq(&ctx->timeout_lock); |
5262f567 JA |
5968 | return 0; |
5969 | } | |
5262f567 | 5970 | |
f458dd84 PB |
5971 | struct io_cancel_data { |
5972 | struct io_ring_ctx *ctx; | |
5973 | u64 user_data; | |
5974 | }; | |
5975 | ||
62755e35 JA |
5976 | static bool io_cancel_cb(struct io_wq_work *work, void *data) |
5977 | { | |
5978 | struct io_kiocb *req = container_of(work, struct io_kiocb, work); | |
f458dd84 | 5979 | struct io_cancel_data *cd = data; |
62755e35 | 5980 | |
f458dd84 | 5981 | return req->ctx == cd->ctx && req->user_data == cd->user_data; |
62755e35 JA |
5982 | } |
5983 | ||
f458dd84 PB |
5984 | static int io_async_cancel_one(struct io_uring_task *tctx, u64 user_data, |
5985 | struct io_ring_ctx *ctx) | |
62755e35 | 5986 | { |
f458dd84 | 5987 | struct io_cancel_data data = { .ctx = ctx, .user_data = user_data, }; |
62755e35 | 5988 | enum io_wq_cancel cancel_ret; |
62755e35 JA |
5989 | int ret = 0; |
5990 | ||
f458dd84 | 5991 | if (!tctx || !tctx->io_wq) |
5aa75ed5 JA |
5992 | return -ENOENT; |
5993 | ||
f458dd84 | 5994 | cancel_ret = io_wq_cancel_cb(tctx->io_wq, io_cancel_cb, &data, false); |
62755e35 JA |
5995 | switch (cancel_ret) { |
5996 | case IO_WQ_CANCEL_OK: | |
5997 | ret = 0; | |
5998 | break; | |
5999 | case IO_WQ_CANCEL_RUNNING: | |
6000 | ret = -EALREADY; | |
6001 | break; | |
6002 | case IO_WQ_CANCEL_NOTFOUND: | |
6003 | ret = -ENOENT; | |
6004 | break; | |
6005 | } | |
6006 | ||
e977d6d3 JA |
6007 | return ret; |
6008 | } | |
6009 | ||
8cb01fac | 6010 | static int io_try_cancel_userdata(struct io_kiocb *req, u64 sqe_addr) |
47f46768 | 6011 | { |
8cb01fac | 6012 | struct io_ring_ctx *ctx = req->ctx; |
47f46768 JA |
6013 | int ret; |
6014 | ||
dadebc35 | 6015 | WARN_ON_ONCE(!io_wq_current_is_worker() && req->task != current); |
8cb01fac | 6016 | |
f458dd84 | 6017 | ret = io_async_cancel_one(req->task->io_uring, sqe_addr, ctx); |
df9727af | 6018 | if (ret != -ENOENT) |
8cb01fac | 6019 | return ret; |
505657bc PB |
6020 | |
6021 | spin_lock(&ctx->completion_lock); | |
79ebeaee | 6022 | spin_lock_irq(&ctx->timeout_lock); |
47f46768 | 6023 | ret = io_timeout_cancel(ctx, sqe_addr); |
79ebeaee | 6024 | spin_unlock_irq(&ctx->timeout_lock); |
47f46768 | 6025 | if (ret != -ENOENT) |
505657bc PB |
6026 | goto out; |
6027 | ret = io_poll_cancel(ctx, sqe_addr, false); | |
6028 | out: | |
6029 | spin_unlock(&ctx->completion_lock); | |
6030 | return ret; | |
47f46768 JA |
6031 | } |
6032 | ||
3529d8c2 JA |
6033 | static int io_async_cancel_prep(struct io_kiocb *req, |
6034 | const struct io_uring_sqe *sqe) | |
e977d6d3 | 6035 | { |
fbf23849 | 6036 | if (unlikely(req->ctx->flags & IORING_SETUP_IOPOLL)) |
e977d6d3 | 6037 | return -EINVAL; |
61710e43 DA |
6038 | if (unlikely(req->flags & (REQ_F_FIXED_FILE | REQ_F_BUFFER_SELECT))) |
6039 | return -EINVAL; | |
26578cda PB |
6040 | if (sqe->ioprio || sqe->off || sqe->len || sqe->cancel_flags || |
6041 | sqe->splice_fd_in) | |
e977d6d3 JA |
6042 | return -EINVAL; |
6043 | ||
fbf23849 JA |
6044 | req->cancel.addr = READ_ONCE(sqe->addr); |
6045 | return 0; | |
6046 | } | |
6047 | ||
61e98203 | 6048 | static int io_async_cancel(struct io_kiocb *req, unsigned int issue_flags) |
fbf23849 JA |
6049 | { |
6050 | struct io_ring_ctx *ctx = req->ctx; | |
58f99373 PB |
6051 | u64 sqe_addr = req->cancel.addr; |
6052 | struct io_tctx_node *node; | |
6053 | int ret; | |
6054 | ||
8cb01fac | 6055 | ret = io_try_cancel_userdata(req, sqe_addr); |
58f99373 PB |
6056 | if (ret != -ENOENT) |
6057 | goto done; | |
58f99373 PB |
6058 | |
6059 | /* slow path, try all io-wq's */ | |
6060 | io_ring_submit_lock(ctx, !(issue_flags & IO_URING_F_NONBLOCK)); | |
6061 | ret = -ENOENT; | |
6062 | list_for_each_entry(node, &ctx->tctx_list, ctx_node) { | |
6063 | struct io_uring_task *tctx = node->task->io_uring; | |
fbf23849 | 6064 | |
58f99373 PB |
6065 | ret = io_async_cancel_one(tctx, req->cancel.addr, ctx); |
6066 | if (ret != -ENOENT) | |
6067 | break; | |
6068 | } | |
6069 | io_ring_submit_unlock(ctx, !(issue_flags & IO_URING_F_NONBLOCK)); | |
58f99373 | 6070 | done: |
58f99373 | 6071 | if (ret < 0) |
93d2bcd2 | 6072 | req_set_fail(req); |
505657bc | 6073 | io_req_complete_post(req, ret, 0); |
5262f567 JA |
6074 | return 0; |
6075 | } | |
6076 | ||
269bbe5f | 6077 | static int io_rsrc_update_prep(struct io_kiocb *req, |
05f3fb3c JA |
6078 | const struct io_uring_sqe *sqe) |
6079 | { | |
61710e43 DA |
6080 | if (unlikely(req->flags & (REQ_F_FIXED_FILE | REQ_F_BUFFER_SELECT))) |
6081 | return -EINVAL; | |
26578cda | 6082 | if (sqe->ioprio || sqe->rw_flags || sqe->splice_fd_in) |
05f3fb3c JA |
6083 | return -EINVAL; |
6084 | ||
269bbe5f BM |
6085 | req->rsrc_update.offset = READ_ONCE(sqe->off); |
6086 | req->rsrc_update.nr_args = READ_ONCE(sqe->len); | |
6087 | if (!req->rsrc_update.nr_args) | |
05f3fb3c | 6088 | return -EINVAL; |
269bbe5f | 6089 | req->rsrc_update.arg = READ_ONCE(sqe->addr); |
05f3fb3c JA |
6090 | return 0; |
6091 | } | |
6092 | ||
889fca73 | 6093 | static int io_files_update(struct io_kiocb *req, unsigned int issue_flags) |
fbf23849 JA |
6094 | { |
6095 | struct io_ring_ctx *ctx = req->ctx; | |
c3bdad02 | 6096 | struct io_uring_rsrc_update2 up; |
05f3fb3c | 6097 | int ret; |
fbf23849 | 6098 | |
45d189c6 | 6099 | if (issue_flags & IO_URING_F_NONBLOCK) |
05f3fb3c | 6100 | return -EAGAIN; |
05f3fb3c | 6101 | |
269bbe5f BM |
6102 | up.offset = req->rsrc_update.offset; |
6103 | up.data = req->rsrc_update.arg; | |
c3bdad02 PB |
6104 | up.nr = 0; |
6105 | up.tags = 0; | |
615cee49 | 6106 | up.resv = 0; |
05f3fb3c JA |
6107 | |
6108 | mutex_lock(&ctx->uring_lock); | |
fdecb662 | 6109 | ret = __io_register_rsrc_update(ctx, IORING_RSRC_FILE, |
98f0b3b4 | 6110 | &up, req->rsrc_update.nr_args); |
05f3fb3c JA |
6111 | mutex_unlock(&ctx->uring_lock); |
6112 | ||
6113 | if (ret < 0) | |
93d2bcd2 | 6114 | req_set_fail(req); |
889fca73 | 6115 | __io_req_complete(req, issue_flags, ret, 0); |
5262f567 JA |
6116 | return 0; |
6117 | } | |
6118 | ||
bfe76559 | 6119 | static int io_req_prep(struct io_kiocb *req, const struct io_uring_sqe *sqe) |
f67676d1 | 6120 | { |
d625c6ee | 6121 | switch (req->opcode) { |
e781573e | 6122 | case IORING_OP_NOP: |
bfe76559 | 6123 | return 0; |
f67676d1 JA |
6124 | case IORING_OP_READV: |
6125 | case IORING_OP_READ_FIXED: | |
3a6820f2 | 6126 | case IORING_OP_READ: |
bfe76559 | 6127 | return io_read_prep(req, sqe); |
f67676d1 JA |
6128 | case IORING_OP_WRITEV: |
6129 | case IORING_OP_WRITE_FIXED: | |
3a6820f2 | 6130 | case IORING_OP_WRITE: |
bfe76559 | 6131 | return io_write_prep(req, sqe); |
0969e783 | 6132 | case IORING_OP_POLL_ADD: |
bfe76559 | 6133 | return io_poll_add_prep(req, sqe); |
0969e783 | 6134 | case IORING_OP_POLL_REMOVE: |
c5de0036 | 6135 | return io_poll_update_prep(req, sqe); |
8ed8d3c3 | 6136 | case IORING_OP_FSYNC: |
1155c76a | 6137 | return io_fsync_prep(req, sqe); |
8ed8d3c3 | 6138 | case IORING_OP_SYNC_FILE_RANGE: |
1155c76a | 6139 | return io_sfr_prep(req, sqe); |
03b1230c | 6140 | case IORING_OP_SENDMSG: |
fddaface | 6141 | case IORING_OP_SEND: |
bfe76559 | 6142 | return io_sendmsg_prep(req, sqe); |
03b1230c | 6143 | case IORING_OP_RECVMSG: |
fddaface | 6144 | case IORING_OP_RECV: |
bfe76559 | 6145 | return io_recvmsg_prep(req, sqe); |
f499a021 | 6146 | case IORING_OP_CONNECT: |
bfe76559 | 6147 | return io_connect_prep(req, sqe); |
2d28390a | 6148 | case IORING_OP_TIMEOUT: |
bfe76559 | 6149 | return io_timeout_prep(req, sqe, false); |
b29472ee | 6150 | case IORING_OP_TIMEOUT_REMOVE: |
bfe76559 | 6151 | return io_timeout_remove_prep(req, sqe); |
fbf23849 | 6152 | case IORING_OP_ASYNC_CANCEL: |
bfe76559 | 6153 | return io_async_cancel_prep(req, sqe); |
2d28390a | 6154 | case IORING_OP_LINK_TIMEOUT: |
bfe76559 | 6155 | return io_timeout_prep(req, sqe, true); |
8ed8d3c3 | 6156 | case IORING_OP_ACCEPT: |
bfe76559 | 6157 | return io_accept_prep(req, sqe); |
d63d1b5e | 6158 | case IORING_OP_FALLOCATE: |
bfe76559 | 6159 | return io_fallocate_prep(req, sqe); |
15b71abe | 6160 | case IORING_OP_OPENAT: |
bfe76559 | 6161 | return io_openat_prep(req, sqe); |
b5dba59e | 6162 | case IORING_OP_CLOSE: |
bfe76559 | 6163 | return io_close_prep(req, sqe); |
05f3fb3c | 6164 | case IORING_OP_FILES_UPDATE: |
269bbe5f | 6165 | return io_rsrc_update_prep(req, sqe); |
eddc7ef5 | 6166 | case IORING_OP_STATX: |
bfe76559 | 6167 | return io_statx_prep(req, sqe); |
4840e418 | 6168 | case IORING_OP_FADVISE: |
bfe76559 | 6169 | return io_fadvise_prep(req, sqe); |
c1ca757b | 6170 | case IORING_OP_MADVISE: |
bfe76559 | 6171 | return io_madvise_prep(req, sqe); |
cebdb986 | 6172 | case IORING_OP_OPENAT2: |
bfe76559 | 6173 | return io_openat2_prep(req, sqe); |
3e4827b0 | 6174 | case IORING_OP_EPOLL_CTL: |
bfe76559 | 6175 | return io_epoll_ctl_prep(req, sqe); |
7d67af2c | 6176 | case IORING_OP_SPLICE: |
bfe76559 | 6177 | return io_splice_prep(req, sqe); |
ddf0322d | 6178 | case IORING_OP_PROVIDE_BUFFERS: |
bfe76559 | 6179 | return io_provide_buffers_prep(req, sqe); |
067524e9 | 6180 | case IORING_OP_REMOVE_BUFFERS: |
bfe76559 | 6181 | return io_remove_buffers_prep(req, sqe); |
f2a8d5c7 | 6182 | case IORING_OP_TEE: |
bfe76559 | 6183 | return io_tee_prep(req, sqe); |
36f4fa68 JA |
6184 | case IORING_OP_SHUTDOWN: |
6185 | return io_shutdown_prep(req, sqe); | |
80a261fd JA |
6186 | case IORING_OP_RENAMEAT: |
6187 | return io_renameat_prep(req, sqe); | |
14a1143b JA |
6188 | case IORING_OP_UNLINKAT: |
6189 | return io_unlinkat_prep(req, sqe); | |
f67676d1 JA |
6190 | } |
6191 | ||
bfe76559 PB |
6192 | printk_once(KERN_WARNING "io_uring: unhandled opcode %d\n", |
6193 | req->opcode); | |
bd54b6fe | 6194 | return -EINVAL; |
bfe76559 PB |
6195 | } |
6196 | ||
93642ef8 | 6197 | static int io_req_prep_async(struct io_kiocb *req) |
bfe76559 | 6198 | { |
b7e298d2 PB |
6199 | if (!io_op_defs[req->opcode].needs_async_setup) |
6200 | return 0; | |
6201 | if (WARN_ON_ONCE(req->async_data)) | |
6202 | return -EFAULT; | |
6203 | if (io_alloc_async_data(req)) | |
6204 | return -EAGAIN; | |
6205 | ||
93642ef8 PB |
6206 | switch (req->opcode) { |
6207 | case IORING_OP_READV: | |
93642ef8 PB |
6208 | return io_rw_prep_async(req, READ); |
6209 | case IORING_OP_WRITEV: | |
93642ef8 PB |
6210 | return io_rw_prep_async(req, WRITE); |
6211 | case IORING_OP_SENDMSG: | |
93642ef8 PB |
6212 | return io_sendmsg_prep_async(req); |
6213 | case IORING_OP_RECVMSG: | |
93642ef8 PB |
6214 | return io_recvmsg_prep_async(req); |
6215 | case IORING_OP_CONNECT: | |
6216 | return io_connect_prep_async(req); | |
6217 | } | |
b7e298d2 PB |
6218 | printk_once(KERN_WARNING "io_uring: prep_async() bad opcode %d\n", |
6219 | req->opcode); | |
6220 | return -EFAULT; | |
f67676d1 JA |
6221 | } |
6222 | ||
9cf7c104 PB |
6223 | static u32 io_get_sequence(struct io_kiocb *req) |
6224 | { | |
a3dbdf54 | 6225 | u32 seq = req->ctx->cached_sq_head; |
9cf7c104 | 6226 | |
a3dbdf54 PB |
6227 | /* need original cached_sq_head, but it was increased for each req */ |
6228 | io_for_each_link(req, req) | |
6229 | seq--; | |
6230 | return seq; | |
9cf7c104 PB |
6231 | } |
6232 | ||
76cc33d7 | 6233 | static bool io_drain_req(struct io_kiocb *req) |
de0617e4 | 6234 | { |
3c19966d | 6235 | struct io_kiocb *pos; |
a197f664 | 6236 | struct io_ring_ctx *ctx = req->ctx; |
27dc8338 | 6237 | struct io_defer_entry *de; |
f67676d1 | 6238 | int ret; |
9cf7c104 | 6239 | u32 seq; |
de0617e4 | 6240 | |
3c19966d PB |
6241 | /* |
6242 | * If we need to drain a request in the middle of a link, drain the | |
6243 | * head request and the next request/link after the current link. | |
6244 | * Considering sequential execution of links, IOSQE_IO_DRAIN will be | |
6245 | * maintained for every request of our link. | |
6246 | */ | |
6247 | if (ctx->drain_next) { | |
6248 | req->flags |= REQ_F_IO_DRAIN; | |
6249 | ctx->drain_next = false; | |
6250 | } | |
6251 | /* not interested in head, start from the first linked */ | |
6252 | io_for_each_link(pos, req->link) { | |
6253 | if (pos->flags & REQ_F_IO_DRAIN) { | |
6254 | ctx->drain_next = true; | |
6255 | req->flags |= REQ_F_IO_DRAIN; | |
6256 | break; | |
6257 | } | |
6258 | } | |
6259 | ||
9d858b21 | 6260 | /* Still need defer if there is pending req in defer list. */ |
9cf7c104 | 6261 | if (likely(list_empty_careful(&ctx->defer_list) && |
10c66904 PB |
6262 | !(req->flags & REQ_F_IO_DRAIN))) { |
6263 | ctx->drain_active = false; | |
76cc33d7 | 6264 | return false; |
10c66904 | 6265 | } |
9cf7c104 PB |
6266 | |
6267 | seq = io_get_sequence(req); | |
6268 | /* Still a chance to pass the sequence check */ | |
6269 | if (!req_need_defer(req, seq) && list_empty_careful(&ctx->defer_list)) | |
76cc33d7 | 6270 | return false; |
de0617e4 | 6271 | |
b7e298d2 | 6272 | ret = io_req_prep_async(req); |
be7053b7 | 6273 | if (ret) |
1b48773f | 6274 | goto fail; |
cbdcb435 | 6275 | io_prep_async_link(req); |
27dc8338 | 6276 | de = kmalloc(sizeof(*de), GFP_KERNEL); |
76cc33d7 | 6277 | if (!de) { |
1b48773f PB |
6278 | ret = -ENOMEM; |
6279 | fail: | |
6280 | io_req_complete_failed(req, ret); | |
76cc33d7 PB |
6281 | return true; |
6282 | } | |
2d28390a | 6283 | |
79ebeaee | 6284 | spin_lock(&ctx->completion_lock); |
9cf7c104 | 6285 | if (!req_need_defer(req, seq) && list_empty(&ctx->defer_list)) { |
79ebeaee | 6286 | spin_unlock(&ctx->completion_lock); |
27dc8338 | 6287 | kfree(de); |
f237c30a | 6288 | io_queue_async_work(req, NULL); |
76cc33d7 | 6289 | return true; |
de0617e4 JA |
6290 | } |
6291 | ||
915967f6 | 6292 | trace_io_uring_defer(ctx, req, req->user_data); |
27dc8338 | 6293 | de->req = req; |
9cf7c104 | 6294 | de->seq = seq; |
27dc8338 | 6295 | list_add_tail(&de->list, &ctx->defer_list); |
79ebeaee | 6296 | spin_unlock(&ctx->completion_lock); |
76cc33d7 | 6297 | return true; |
de0617e4 JA |
6298 | } |
6299 | ||
68fb8979 | 6300 | static void io_clean_op(struct io_kiocb *req) |
99bc4c38 | 6301 | { |
0e1b6fe3 PB |
6302 | if (req->flags & REQ_F_BUFFER_SELECTED) { |
6303 | switch (req->opcode) { | |
6304 | case IORING_OP_READV: | |
6305 | case IORING_OP_READ_FIXED: | |
6306 | case IORING_OP_READ: | |
bcda7baa | 6307 | kfree((void *)(unsigned long)req->rw.addr); |
0e1b6fe3 PB |
6308 | break; |
6309 | case IORING_OP_RECVMSG: | |
6310 | case IORING_OP_RECV: | |
bcda7baa | 6311 | kfree(req->sr_msg.kbuf); |
0e1b6fe3 PB |
6312 | break; |
6313 | } | |
99bc4c38 PB |
6314 | } |
6315 | ||
0e1b6fe3 PB |
6316 | if (req->flags & REQ_F_NEED_CLEANUP) { |
6317 | switch (req->opcode) { | |
6318 | case IORING_OP_READV: | |
6319 | case IORING_OP_READ_FIXED: | |
6320 | case IORING_OP_READ: | |
6321 | case IORING_OP_WRITEV: | |
6322 | case IORING_OP_WRITE_FIXED: | |
e8c2bc1f JA |
6323 | case IORING_OP_WRITE: { |
6324 | struct io_async_rw *io = req->async_data; | |
1dacb4df PB |
6325 | |
6326 | kfree(io->free_iovec); | |
0e1b6fe3 | 6327 | break; |
e8c2bc1f | 6328 | } |
0e1b6fe3 | 6329 | case IORING_OP_RECVMSG: |
e8c2bc1f JA |
6330 | case IORING_OP_SENDMSG: { |
6331 | struct io_async_msghdr *io = req->async_data; | |
257e84a5 PB |
6332 | |
6333 | kfree(io->free_iov); | |
0e1b6fe3 | 6334 | break; |
e8c2bc1f | 6335 | } |
0e1b6fe3 PB |
6336 | case IORING_OP_SPLICE: |
6337 | case IORING_OP_TEE: | |
e1d767f0 PB |
6338 | if (!(req->splice.flags & SPLICE_F_FD_IN_FIXED)) |
6339 | io_put_file(req->splice.file_in); | |
0e1b6fe3 | 6340 | break; |
f3cd4850 JA |
6341 | case IORING_OP_OPENAT: |
6342 | case IORING_OP_OPENAT2: | |
6343 | if (req->open.filename) | |
6344 | putname(req->open.filename); | |
6345 | break; | |
80a261fd JA |
6346 | case IORING_OP_RENAMEAT: |
6347 | putname(req->rename.oldpath); | |
6348 | putname(req->rename.newpath); | |
6349 | break; | |
14a1143b JA |
6350 | case IORING_OP_UNLINKAT: |
6351 | putname(req->unlink.filename); | |
6352 | break; | |
0e1b6fe3 | 6353 | } |
99bc4c38 | 6354 | } |
75652a30 JA |
6355 | if ((req->flags & REQ_F_POLLED) && req->apoll) { |
6356 | kfree(req->apoll->double_poll); | |
6357 | kfree(req->apoll); | |
6358 | req->apoll = NULL; | |
6359 | } | |
3a0a6902 PB |
6360 | if (req->flags & REQ_F_INFLIGHT) { |
6361 | struct io_uring_task *tctx = req->task->io_uring; | |
6362 | ||
6363 | atomic_dec(&tctx->inflight_tracked); | |
3a0a6902 | 6364 | } |
c854357b | 6365 | if (req->flags & REQ_F_CREDS) |
b8e64b53 | 6366 | put_cred(req->creds); |
c854357b PB |
6367 | |
6368 | req->flags &= ~IO_REQ_CLEAN_FLAGS; | |
99bc4c38 PB |
6369 | } |
6370 | ||
889fca73 | 6371 | static int io_issue_sqe(struct io_kiocb *req, unsigned int issue_flags) |
2b188cc1 | 6372 | { |
a197f664 | 6373 | struct io_ring_ctx *ctx = req->ctx; |
5730b27e | 6374 | const struct cred *creds = NULL; |
d625c6ee | 6375 | int ret; |
2b188cc1 | 6376 | |
b8e64b53 | 6377 | if ((req->flags & REQ_F_CREDS) && req->creds != current_cred()) |
c10d1f98 | 6378 | creds = override_creds(req->creds); |
5730b27e | 6379 | |
d625c6ee | 6380 | switch (req->opcode) { |
2b188cc1 | 6381 | case IORING_OP_NOP: |
889fca73 | 6382 | ret = io_nop(req, issue_flags); |
2b188cc1 JA |
6383 | break; |
6384 | case IORING_OP_READV: | |
edafccee | 6385 | case IORING_OP_READ_FIXED: |
3a6820f2 | 6386 | case IORING_OP_READ: |
889fca73 | 6387 | ret = io_read(req, issue_flags); |
edafccee | 6388 | break; |
3529d8c2 | 6389 | case IORING_OP_WRITEV: |
edafccee | 6390 | case IORING_OP_WRITE_FIXED: |
3a6820f2 | 6391 | case IORING_OP_WRITE: |
889fca73 | 6392 | ret = io_write(req, issue_flags); |
2b188cc1 | 6393 | break; |
c992fe29 | 6394 | case IORING_OP_FSYNC: |
45d189c6 | 6395 | ret = io_fsync(req, issue_flags); |
c992fe29 | 6396 | break; |
221c5eb2 | 6397 | case IORING_OP_POLL_ADD: |
61e98203 | 6398 | ret = io_poll_add(req, issue_flags); |
221c5eb2 JA |
6399 | break; |
6400 | case IORING_OP_POLL_REMOVE: | |
c5de0036 | 6401 | ret = io_poll_update(req, issue_flags); |
221c5eb2 | 6402 | break; |
5d17b4a4 | 6403 | case IORING_OP_SYNC_FILE_RANGE: |
45d189c6 | 6404 | ret = io_sync_file_range(req, issue_flags); |
5d17b4a4 | 6405 | break; |
0fa03c62 | 6406 | case IORING_OP_SENDMSG: |
889fca73 | 6407 | ret = io_sendmsg(req, issue_flags); |
062d04d7 | 6408 | break; |
fddaface | 6409 | case IORING_OP_SEND: |
889fca73 | 6410 | ret = io_send(req, issue_flags); |
0fa03c62 | 6411 | break; |
aa1fa28f | 6412 | case IORING_OP_RECVMSG: |
889fca73 | 6413 | ret = io_recvmsg(req, issue_flags); |
062d04d7 | 6414 | break; |
fddaface | 6415 | case IORING_OP_RECV: |
889fca73 | 6416 | ret = io_recv(req, issue_flags); |
aa1fa28f | 6417 | break; |
5262f567 | 6418 | case IORING_OP_TIMEOUT: |
61e98203 | 6419 | ret = io_timeout(req, issue_flags); |
5262f567 | 6420 | break; |
11365043 | 6421 | case IORING_OP_TIMEOUT_REMOVE: |
61e98203 | 6422 | ret = io_timeout_remove(req, issue_flags); |
11365043 | 6423 | break; |
17f2fe35 | 6424 | case IORING_OP_ACCEPT: |
889fca73 | 6425 | ret = io_accept(req, issue_flags); |
17f2fe35 | 6426 | break; |
f8e85cf2 | 6427 | case IORING_OP_CONNECT: |
889fca73 | 6428 | ret = io_connect(req, issue_flags); |
f8e85cf2 | 6429 | break; |
62755e35 | 6430 | case IORING_OP_ASYNC_CANCEL: |
61e98203 | 6431 | ret = io_async_cancel(req, issue_flags); |
62755e35 | 6432 | break; |
d63d1b5e | 6433 | case IORING_OP_FALLOCATE: |
45d189c6 | 6434 | ret = io_fallocate(req, issue_flags); |
d63d1b5e | 6435 | break; |
15b71abe | 6436 | case IORING_OP_OPENAT: |
45d189c6 | 6437 | ret = io_openat(req, issue_flags); |
15b71abe | 6438 | break; |
b5dba59e | 6439 | case IORING_OP_CLOSE: |
889fca73 | 6440 | ret = io_close(req, issue_flags); |
b5dba59e | 6441 | break; |
05f3fb3c | 6442 | case IORING_OP_FILES_UPDATE: |
889fca73 | 6443 | ret = io_files_update(req, issue_flags); |
05f3fb3c | 6444 | break; |
eddc7ef5 | 6445 | case IORING_OP_STATX: |
45d189c6 | 6446 | ret = io_statx(req, issue_flags); |
eddc7ef5 | 6447 | break; |
4840e418 | 6448 | case IORING_OP_FADVISE: |
45d189c6 | 6449 | ret = io_fadvise(req, issue_flags); |
4840e418 | 6450 | break; |
c1ca757b | 6451 | case IORING_OP_MADVISE: |
45d189c6 | 6452 | ret = io_madvise(req, issue_flags); |
c1ca757b | 6453 | break; |
cebdb986 | 6454 | case IORING_OP_OPENAT2: |
45d189c6 | 6455 | ret = io_openat2(req, issue_flags); |
cebdb986 | 6456 | break; |
3e4827b0 | 6457 | case IORING_OP_EPOLL_CTL: |
889fca73 | 6458 | ret = io_epoll_ctl(req, issue_flags); |
3e4827b0 | 6459 | break; |
7d67af2c | 6460 | case IORING_OP_SPLICE: |
45d189c6 | 6461 | ret = io_splice(req, issue_flags); |
7d67af2c | 6462 | break; |
ddf0322d | 6463 | case IORING_OP_PROVIDE_BUFFERS: |
889fca73 | 6464 | ret = io_provide_buffers(req, issue_flags); |
ddf0322d | 6465 | break; |
067524e9 | 6466 | case IORING_OP_REMOVE_BUFFERS: |
889fca73 | 6467 | ret = io_remove_buffers(req, issue_flags); |
3e4827b0 | 6468 | break; |
f2a8d5c7 | 6469 | case IORING_OP_TEE: |
45d189c6 | 6470 | ret = io_tee(req, issue_flags); |
f2a8d5c7 | 6471 | break; |
36f4fa68 | 6472 | case IORING_OP_SHUTDOWN: |
45d189c6 | 6473 | ret = io_shutdown(req, issue_flags); |
36f4fa68 | 6474 | break; |
80a261fd | 6475 | case IORING_OP_RENAMEAT: |
45d189c6 | 6476 | ret = io_renameat(req, issue_flags); |
80a261fd | 6477 | break; |
14a1143b | 6478 | case IORING_OP_UNLINKAT: |
45d189c6 | 6479 | ret = io_unlinkat(req, issue_flags); |
14a1143b | 6480 | break; |
2b188cc1 JA |
6481 | default: |
6482 | ret = -EINVAL; | |
6483 | break; | |
6484 | } | |
6485 | ||
5730b27e JA |
6486 | if (creds) |
6487 | revert_creds(creds); | |
def596e9 JA |
6488 | if (ret) |
6489 | return ret; | |
b532576e | 6490 | /* If the op doesn't have a file, we're not polling for it */ |
cb3d8972 PB |
6491 | if ((ctx->flags & IORING_SETUP_IOPOLL) && req->file) |
6492 | io_iopoll_req_issued(req); | |
def596e9 JA |
6493 | |
6494 | return 0; | |
2b188cc1 JA |
6495 | } |
6496 | ||
ebc11b6c PB |
6497 | static struct io_wq_work *io_wq_free_work(struct io_wq_work *work) |
6498 | { | |
6499 | struct io_kiocb *req = container_of(work, struct io_kiocb, work); | |
6500 | ||
6501 | req = io_put_req_find_next(req); | |
6502 | return req ? &req->work : NULL; | |
6503 | } | |
6504 | ||
5280f7e5 | 6505 | static void io_wq_submit_work(struct io_wq_work *work) |
2b188cc1 JA |
6506 | { |
6507 | struct io_kiocb *req = container_of(work, struct io_kiocb, work); | |
6df1db6b | 6508 | struct io_kiocb *timeout; |
561fb04a | 6509 | int ret = 0; |
2b188cc1 | 6510 | |
48dcd38d PB |
6511 | /* one will be dropped by ->io_free_work() after returning to io-wq */ |
6512 | if (!(req->flags & REQ_F_REFCOUNT)) | |
6513 | __io_req_set_refcount(req, 2); | |
6514 | else | |
6515 | req_ref_get(req); | |
5d5901a3 | 6516 | |
6df1db6b PB |
6517 | timeout = io_prep_linked_timeout(req); |
6518 | if (timeout) | |
6519 | io_queue_linked_timeout(timeout); | |
d4c81f38 | 6520 | |
dadebc35 | 6521 | /* either cancelled or io-wq is dying, so don't touch tctx->iowq */ |
4014d943 | 6522 | if (work->flags & IO_WQ_WORK_CANCEL) |
561fb04a | 6523 | ret = -ECANCELED; |
31b51510 | 6524 | |
561fb04a | 6525 | if (!ret) { |
561fb04a | 6526 | do { |
889fca73 | 6527 | ret = io_issue_sqe(req, 0); |
561fb04a JA |
6528 | /* |
6529 | * We can get EAGAIN for polled IO even though we're | |
6530 | * forcing a sync submission from here, since we can't | |
6531 | * wait for request slots on the block side. | |
6532 | */ | |
6533 | if (ret != -EAGAIN) | |
6534 | break; | |
6535 | cond_resched(); | |
6536 | } while (1); | |
6537 | } | |
31b51510 | 6538 | |
a3df7698 | 6539 | /* avoid locking problems by failing it from a clean context */ |
5d5901a3 | 6540 | if (ret) |
a3df7698 | 6541 | io_req_task_queue_fail(req, ret); |
2b188cc1 JA |
6542 | } |
6543 | ||
aeca241b | 6544 | static inline struct io_fixed_file *io_fixed_file_slot(struct io_file_table *table, |
042b0d85 | 6545 | unsigned i) |
65e19f54 | 6546 | { |
042b0d85 | 6547 | return &table->files[i]; |
dafecf19 PB |
6548 | } |
6549 | ||
65e19f54 JA |
6550 | static inline struct file *io_file_from_index(struct io_ring_ctx *ctx, |
6551 | int index) | |
6552 | { | |
aeca241b | 6553 | struct io_fixed_file *slot = io_fixed_file_slot(&ctx->file_table, index); |
65e19f54 | 6554 | |
a04b0ac0 | 6555 | return (struct file *) (slot->file_ptr & FFS_MASK); |
65e19f54 JA |
6556 | } |
6557 | ||
a04b0ac0 | 6558 | static void io_fixed_file_set(struct io_fixed_file *file_slot, struct file *file) |
9a321c98 PB |
6559 | { |
6560 | unsigned long file_ptr = (unsigned long) file; | |
6561 | ||
b191e2df | 6562 | if (__io_file_supports_nowait(file, READ)) |
9a321c98 | 6563 | file_ptr |= FFS_ASYNC_READ; |
b191e2df | 6564 | if (__io_file_supports_nowait(file, WRITE)) |
9a321c98 PB |
6565 | file_ptr |= FFS_ASYNC_WRITE; |
6566 | if (S_ISREG(file_inode(file)->i_mode)) | |
6567 | file_ptr |= FFS_ISREG; | |
a04b0ac0 | 6568 | file_slot->file_ptr = file_ptr; |
65e19f54 JA |
6569 | } |
6570 | ||
ac177053 PB |
6571 | static inline struct file *io_file_get_fixed(struct io_ring_ctx *ctx, |
6572 | struct io_kiocb *req, int fd) | |
09bb8394 | 6573 | { |
8da11c19 | 6574 | struct file *file; |
ac177053 | 6575 | unsigned long file_ptr; |
09bb8394 | 6576 | |
ac177053 PB |
6577 | if (unlikely((unsigned int)fd >= ctx->nr_user_files)) |
6578 | return NULL; | |
6579 | fd = array_index_nospec(fd, ctx->nr_user_files); | |
6580 | file_ptr = io_fixed_file_slot(&ctx->file_table, fd)->file_ptr; | |
6581 | file = (struct file *) (file_ptr & FFS_MASK); | |
6582 | file_ptr &= ~FFS_MASK; | |
6583 | /* mask in overlapping REQ_F and FFS bits */ | |
b191e2df | 6584 | req->flags |= (file_ptr << REQ_F_NOWAIT_READ_BIT); |
ac177053 PB |
6585 | io_req_set_rsrc_node(req); |
6586 | return file; | |
6587 | } | |
d44f554e | 6588 | |
ac177053 | 6589 | static struct file *io_file_get_normal(struct io_ring_ctx *ctx, |
ac177053 PB |
6590 | struct io_kiocb *req, int fd) |
6591 | { | |
62906e89 | 6592 | struct file *file = fget(fd); |
ac177053 PB |
6593 | |
6594 | trace_io_uring_file_get(ctx, fd); | |
09bb8394 | 6595 | |
ac177053 PB |
6596 | /* we don't allow fixed io_uring files */ |
6597 | if (file && unlikely(file->f_op == &io_uring_fops)) | |
6598 | io_req_track_inflight(req); | |
8371adf5 | 6599 | return file; |
09bb8394 JA |
6600 | } |
6601 | ||
ac177053 | 6602 | static inline struct file *io_file_get(struct io_ring_ctx *ctx, |
ac177053 PB |
6603 | struct io_kiocb *req, int fd, bool fixed) |
6604 | { | |
6605 | if (fixed) | |
6606 | return io_file_get_fixed(ctx, req, fd); | |
6607 | else | |
62906e89 | 6608 | return io_file_get_normal(ctx, req, fd); |
ac177053 PB |
6609 | } |
6610 | ||
f237c30a | 6611 | static void io_req_task_link_timeout(struct io_kiocb *req, bool *locked) |
89b263f6 JA |
6612 | { |
6613 | struct io_kiocb *prev = req->timeout.prev; | |
8cb01fac | 6614 | int ret; |
89b263f6 JA |
6615 | |
6616 | if (prev) { | |
8cb01fac | 6617 | ret = io_try_cancel_userdata(req, prev->user_data); |
505657bc | 6618 | io_req_complete_post(req, ret ?: -ETIME, 0); |
89b263f6 | 6619 | io_put_req(prev); |
89b263f6 JA |
6620 | } else { |
6621 | io_req_complete_post(req, -ETIME, 0); | |
6622 | } | |
6623 | } | |
6624 | ||
2665abfd | 6625 | static enum hrtimer_restart io_link_timeout_fn(struct hrtimer *timer) |
2b188cc1 | 6626 | { |
ad8a48ac JA |
6627 | struct io_timeout_data *data = container_of(timer, |
6628 | struct io_timeout_data, timer); | |
90cd7e42 | 6629 | struct io_kiocb *prev, *req = data->req; |
2665abfd | 6630 | struct io_ring_ctx *ctx = req->ctx; |
2665abfd | 6631 | unsigned long flags; |
2665abfd | 6632 | |
89b263f6 | 6633 | spin_lock_irqsave(&ctx->timeout_lock, flags); |
90cd7e42 PB |
6634 | prev = req->timeout.head; |
6635 | req->timeout.head = NULL; | |
2665abfd JA |
6636 | |
6637 | /* | |
6638 | * We don't expect the list to be empty, that will only happen if we | |
6639 | * race with the completion of the linked work. | |
6640 | */ | |
447c19f3 | 6641 | if (prev) { |
f2f87370 | 6642 | io_remove_next_linked(prev); |
447c19f3 PB |
6643 | if (!req_ref_inc_not_zero(prev)) |
6644 | prev = NULL; | |
6645 | } | |
ef9dd637 | 6646 | list_del(&req->timeout.list); |
89b263f6 JA |
6647 | req->timeout.prev = prev; |
6648 | spin_unlock_irqrestore(&ctx->timeout_lock, flags); | |
2665abfd | 6649 | |
89b263f6 JA |
6650 | req->io_task_work.func = io_req_task_link_timeout; |
6651 | io_req_task_work_add(req); | |
2665abfd JA |
6652 | return HRTIMER_NORESTART; |
6653 | } | |
6654 | ||
de968c18 | 6655 | static void io_queue_linked_timeout(struct io_kiocb *req) |
2665abfd | 6656 | { |
de968c18 PB |
6657 | struct io_ring_ctx *ctx = req->ctx; |
6658 | ||
89b263f6 | 6659 | spin_lock_irq(&ctx->timeout_lock); |
76a46e06 | 6660 | /* |
f2f87370 PB |
6661 | * If the back reference is NULL, then our linked request finished |
6662 | * before we got a chance to setup the timer | |
76a46e06 | 6663 | */ |
90cd7e42 | 6664 | if (req->timeout.head) { |
e8c2bc1f | 6665 | struct io_timeout_data *data = req->async_data; |
94ae5e77 | 6666 | |
ad8a48ac JA |
6667 | data->timer.function = io_link_timeout_fn; |
6668 | hrtimer_start(&data->timer, timespec64_to_ktime(data->ts), | |
6669 | data->mode); | |
ef9dd637 | 6670 | list_add_tail(&req->timeout.list, &ctx->ltimeout_list); |
2665abfd | 6671 | } |
89b263f6 | 6672 | spin_unlock_irq(&ctx->timeout_lock); |
2665abfd | 6673 | /* drop submission reference */ |
76a46e06 JA |
6674 | io_put_req(req); |
6675 | } | |
2665abfd | 6676 | |
c5eef2b9 | 6677 | static void __io_queue_sqe(struct io_kiocb *req) |
282cdc86 | 6678 | __must_hold(&req->ctx->uring_lock) |
2b188cc1 | 6679 | { |
906c6caa | 6680 | struct io_kiocb *linked_timeout; |
e0c5c576 | 6681 | int ret; |
2b188cc1 | 6682 | |
59b735ae | 6683 | issue_sqe: |
c5eef2b9 | 6684 | ret = io_issue_sqe(req, IO_URING_F_NONBLOCK|IO_URING_F_COMPLETE_DEFER); |
193155c8 | 6685 | |
491381ce JA |
6686 | /* |
6687 | * We async punt it if the file wasn't marked NOWAIT, or if the file | |
6688 | * doesn't support non-blocking read/write attempts | |
6689 | */ | |
1840038e | 6690 | if (likely(!ret)) { |
e342c807 | 6691 | if (req->flags & REQ_F_COMPLETE_INLINE) { |
c5eef2b9 | 6692 | struct io_ring_ctx *ctx = req->ctx; |
cd0ca2e0 | 6693 | struct io_submit_state *state = &ctx->submit_state; |
e65ef56d | 6694 | |
cd0ca2e0 PB |
6695 | state->compl_reqs[state->compl_nr++] = req; |
6696 | if (state->compl_nr == ARRAY_SIZE(state->compl_reqs)) | |
2a2758f2 | 6697 | io_submit_flush_completions(ctx); |
906c6caa | 6698 | return; |
0d63c148 | 6699 | } |
906c6caa PB |
6700 | |
6701 | linked_timeout = io_prep_linked_timeout(req); | |
6702 | if (linked_timeout) | |
6703 | io_queue_linked_timeout(linked_timeout); | |
1840038e | 6704 | } else if (ret == -EAGAIN && !(req->flags & REQ_F_NOWAIT)) { |
906c6caa PB |
6705 | linked_timeout = io_prep_linked_timeout(req); |
6706 | ||
59b735ae OL |
6707 | switch (io_arm_poll_handler(req)) { |
6708 | case IO_APOLL_READY: | |
906c6caa PB |
6709 | if (linked_timeout) |
6710 | io_unprep_linked_timeout(req); | |
59b735ae OL |
6711 | goto issue_sqe; |
6712 | case IO_APOLL_ABORTED: | |
1840038e PB |
6713 | /* |
6714 | * Queued up for async execution, worker will release | |
6715 | * submit reference when the iocb is actually submitted. | |
6716 | */ | |
f237c30a | 6717 | io_queue_async_work(req, NULL); |
59b735ae | 6718 | break; |
1840038e | 6719 | } |
906c6caa PB |
6720 | |
6721 | if (linked_timeout) | |
6722 | io_queue_linked_timeout(linked_timeout); | |
0d63c148 | 6723 | } else { |
f41db273 | 6724 | io_req_complete_failed(req, ret); |
9e645e11 | 6725 | } |
2b188cc1 JA |
6726 | } |
6727 | ||
441b8a78 | 6728 | static inline void io_queue_sqe(struct io_kiocb *req) |
282cdc86 | 6729 | __must_hold(&req->ctx->uring_lock) |
4fe2c963 | 6730 | { |
10c66904 | 6731 | if (unlikely(req->ctx->drain_active) && io_drain_req(req)) |
76cc33d7 | 6732 | return; |
4fe2c963 | 6733 | |
a8295b98 | 6734 | if (likely(!(req->flags & (REQ_F_FORCE_ASYNC | REQ_F_FAIL)))) { |
c5eef2b9 | 6735 | __io_queue_sqe(req); |
a8295b98 | 6736 | } else if (req->flags & REQ_F_FAIL) { |
c6d3d9cb | 6737 | io_req_complete_fail_submit(req); |
76cc33d7 PB |
6738 | } else { |
6739 | int ret = io_req_prep_async(req); | |
6740 | ||
6741 | if (unlikely(ret)) | |
6742 | io_req_complete_failed(req, ret); | |
6743 | else | |
f237c30a | 6744 | io_queue_async_work(req, NULL); |
ce35a47a | 6745 | } |
4fe2c963 JL |
6746 | } |
6747 | ||
b16fed66 PB |
6748 | /* |
6749 | * Check SQE restrictions (opcode and flags). | |
6750 | * | |
6751 | * Returns 'true' if SQE is allowed, 'false' otherwise. | |
6752 | */ | |
6753 | static inline bool io_check_restriction(struct io_ring_ctx *ctx, | |
6754 | struct io_kiocb *req, | |
6755 | unsigned int sqe_flags) | |
4fe2c963 | 6756 | { |
4cfb25bf | 6757 | if (likely(!ctx->restricted)) |
b16fed66 PB |
6758 | return true; |
6759 | ||
6760 | if (!test_bit(req->opcode, ctx->restrictions.sqe_op)) | |
6761 | return false; | |
6762 | ||
6763 | if ((sqe_flags & ctx->restrictions.sqe_flags_required) != | |
6764 | ctx->restrictions.sqe_flags_required) | |
6765 | return false; | |
6766 | ||
6767 | if (sqe_flags & ~(ctx->restrictions.sqe_flags_allowed | | |
6768 | ctx->restrictions.sqe_flags_required)) | |
6769 | return false; | |
6770 | ||
6771 | return true; | |
4fe2c963 JL |
6772 | } |
6773 | ||
b16fed66 PB |
6774 | static int io_init_req(struct io_ring_ctx *ctx, struct io_kiocb *req, |
6775 | const struct io_uring_sqe *sqe) | |
282cdc86 | 6776 | __must_hold(&ctx->uring_lock) |
b16fed66 PB |
6777 | { |
6778 | struct io_submit_state *state; | |
6779 | unsigned int sqe_flags; | |
003e8dcc | 6780 | int personality, ret = 0; |
b16fed66 | 6781 | |
864ea921 | 6782 | /* req is partially pre-initialised, see io_preinit_req() */ |
b16fed66 PB |
6783 | req->opcode = READ_ONCE(sqe->opcode); |
6784 | /* same numerical values with corresponding REQ_F_*, safe to copy */ | |
6785 | req->flags = sqe_flags = READ_ONCE(sqe->flags); | |
6786 | req->user_data = READ_ONCE(sqe->user_data); | |
b16fed66 | 6787 | req->file = NULL; |
b16fed66 | 6788 | req->fixed_rsrc_refs = NULL; |
b16fed66 | 6789 | req->task = current; |
b16fed66 PB |
6790 | |
6791 | /* enforce forwards compatibility on users */ | |
dddca226 | 6792 | if (unlikely(sqe_flags & ~SQE_VALID_FLAGS)) |
b16fed66 | 6793 | return -EINVAL; |
b16fed66 PB |
6794 | if (unlikely(req->opcode >= IORING_OP_LAST)) |
6795 | return -EINVAL; | |
4cfb25bf | 6796 | if (!io_check_restriction(ctx, req, sqe_flags)) |
b16fed66 PB |
6797 | return -EACCES; |
6798 | ||
6799 | if ((sqe_flags & IOSQE_BUFFER_SELECT) && | |
6800 | !io_op_defs[req->opcode].buffer_select) | |
6801 | return -EOPNOTSUPP; | |
3c19966d PB |
6802 | if (unlikely(sqe_flags & IOSQE_IO_DRAIN)) |
6803 | ctx->drain_active = true; | |
863e0560 | 6804 | |
003e8dcc JA |
6805 | personality = READ_ONCE(sqe->personality); |
6806 | if (personality) { | |
c10d1f98 PB |
6807 | req->creds = xa_load(&ctx->personalities, personality); |
6808 | if (!req->creds) | |
003e8dcc | 6809 | return -EINVAL; |
c10d1f98 | 6810 | get_cred(req->creds); |
b8e64b53 | 6811 | req->flags |= REQ_F_CREDS; |
003e8dcc | 6812 | } |
b16fed66 PB |
6813 | state = &ctx->submit_state; |
6814 | ||
6815 | /* | |
6816 | * Plug now if we have more than 1 IO left after this, and the target | |
6817 | * is potentially a read/write to block based storage. | |
6818 | */ | |
6819 | if (!state->plug_started && state->ios_left > 1 && | |
6820 | io_op_defs[req->opcode].plug) { | |
6821 | blk_start_plug(&state->plug); | |
6822 | state->plug_started = true; | |
6823 | } | |
6824 | ||
6825 | if (io_op_defs[req->opcode].needs_file) { | |
62906e89 | 6826 | req->file = io_file_get(ctx, req, READ_ONCE(sqe->fd), |
ac177053 | 6827 | (sqe_flags & IOSQE_FIXED_FILE)); |
b16fed66 PB |
6828 | if (unlikely(!req->file)) |
6829 | ret = -EBADF; | |
6830 | } | |
6831 | ||
6832 | state->ios_left--; | |
6833 | return ret; | |
6834 | } | |
6835 | ||
a6b8cadc | 6836 | static int io_submit_sqe(struct io_ring_ctx *ctx, struct io_kiocb *req, |
a1ab7b35 | 6837 | const struct io_uring_sqe *sqe) |
282cdc86 | 6838 | __must_hold(&ctx->uring_lock) |
9e645e11 | 6839 | { |
a1ab7b35 | 6840 | struct io_submit_link *link = &ctx->submit_state.link; |
ef4ff581 | 6841 | int ret; |
9e645e11 | 6842 | |
a6b8cadc PB |
6843 | ret = io_init_req(ctx, req, sqe); |
6844 | if (unlikely(ret)) { | |
6845 | fail_req: | |
a8295b98 | 6846 | /* fail even hard links since we don't submit */ |
de59bc10 | 6847 | if (link->head) { |
a8295b98 HX |
6848 | /* |
6849 | * we can judge a link req is failed or cancelled by if | |
6850 | * REQ_F_FAIL is set, but the head is an exception since | |
6851 | * it may be set REQ_F_FAIL because of other req's failure | |
6852 | * so let's leverage req->result to distinguish if a head | |
6853 | * is set REQ_F_FAIL because of its failure or other req's | |
6854 | * failure so that we can set the correct ret code for it. | |
6855 | * init result here to avoid affecting the normal path. | |
6856 | */ | |
6857 | if (!(link->head->flags & REQ_F_FAIL)) | |
6858 | req_fail_link_node(link->head, -ECANCELED); | |
6859 | } else if (!(req->flags & (REQ_F_LINK | REQ_F_HARDLINK))) { | |
6860 | /* | |
6861 | * the current req is a normal req, we should return | |
6862 | * error and thus break the submittion loop. | |
6863 | */ | |
6864 | io_req_complete_failed(req, ret); | |
6865 | return ret; | |
de59bc10 | 6866 | } |
a8295b98 HX |
6867 | req_fail_link_node(req, ret); |
6868 | } else { | |
6869 | ret = io_req_prep(req, sqe); | |
6870 | if (unlikely(ret)) | |
6871 | goto fail_req; | |
a6b8cadc | 6872 | } |
441b8a78 | 6873 | |
be7053b7 | 6874 | /* don't need @sqe from now on */ |
236daeae OL |
6875 | trace_io_uring_submit_sqe(ctx, req, req->opcode, req->user_data, |
6876 | req->flags, true, | |
6877 | ctx->flags & IORING_SETUP_SQPOLL); | |
a6b8cadc | 6878 | |
9e645e11 JA |
6879 | /* |
6880 | * If we already have a head request, queue this one for async | |
6881 | * submittal once the head completes. If we don't have a head but | |
6882 | * IOSQE_IO_LINK is set in the sqe, start a new head. This one will be | |
6883 | * submitted sync once the chain is complete. If none of those | |
6884 | * conditions are true (normal request), then just queue it. | |
6885 | */ | |
863e0560 PB |
6886 | if (link->head) { |
6887 | struct io_kiocb *head = link->head; | |
4e88d6e7 | 6888 | |
a8295b98 HX |
6889 | if (!(req->flags & REQ_F_FAIL)) { |
6890 | ret = io_req_prep_async(req); | |
6891 | if (unlikely(ret)) { | |
6892 | req_fail_link_node(req, ret); | |
6893 | if (!(head->flags & REQ_F_FAIL)) | |
6894 | req_fail_link_node(head, -ECANCELED); | |
6895 | } | |
6896 | } | |
9d76377f | 6897 | trace_io_uring_link(ctx, req, head); |
f2f87370 | 6898 | link->last->link = req; |
863e0560 | 6899 | link->last = req; |
32fe525b PB |
6900 | |
6901 | /* last request of a link, enqueue the link */ | |
ef4ff581 | 6902 | if (!(req->flags & (REQ_F_LINK | REQ_F_HARDLINK))) { |
863e0560 | 6903 | link->head = NULL; |
5e159204 | 6904 | io_queue_sqe(head); |
32fe525b | 6905 | } |
9e645e11 | 6906 | } else { |
ef4ff581 | 6907 | if (req->flags & (REQ_F_LINK | REQ_F_HARDLINK)) { |
863e0560 PB |
6908 | link->head = req; |
6909 | link->last = req; | |
711be031 | 6910 | } else { |
be7053b7 | 6911 | io_queue_sqe(req); |
711be031 | 6912 | } |
9e645e11 | 6913 | } |
2e6e1fde | 6914 | |
1d4240cc | 6915 | return 0; |
9e645e11 JA |
6916 | } |
6917 | ||
9a56a232 JA |
6918 | /* |
6919 | * Batched submission is done, ensure local IO is flushed out. | |
6920 | */ | |
ba88ff11 PB |
6921 | static void io_submit_state_end(struct io_submit_state *state, |
6922 | struct io_ring_ctx *ctx) | |
9a56a232 | 6923 | { |
a1ab7b35 | 6924 | if (state->link.head) |
de59bc10 | 6925 | io_queue_sqe(state->link.head); |
cd0ca2e0 | 6926 | if (state->compl_nr) |
2a2758f2 | 6927 | io_submit_flush_completions(ctx); |
27926b68 JA |
6928 | if (state->plug_started) |
6929 | blk_finish_plug(&state->plug); | |
9a56a232 JA |
6930 | } |
6931 | ||
6932 | /* | |
6933 | * Start submission side cache. | |
6934 | */ | |
6935 | static void io_submit_state_start(struct io_submit_state *state, | |
ba88ff11 | 6936 | unsigned int max_ios) |
9a56a232 | 6937 | { |
27926b68 | 6938 | state->plug_started = false; |
9a56a232 | 6939 | state->ios_left = max_ios; |
a1ab7b35 PB |
6940 | /* set only head, no need to init link_last in advance */ |
6941 | state->link.head = NULL; | |
9a56a232 JA |
6942 | } |
6943 | ||
2b188cc1 JA |
6944 | static void io_commit_sqring(struct io_ring_ctx *ctx) |
6945 | { | |
75b28aff | 6946 | struct io_rings *rings = ctx->rings; |
2b188cc1 | 6947 | |
caf582c6 PB |
6948 | /* |
6949 | * Ensure any loads from the SQEs are done at this point, | |
6950 | * since once we write the new head, the application could | |
6951 | * write new data to them. | |
6952 | */ | |
6953 | smp_store_release(&rings->sq.head, ctx->cached_sq_head); | |
2b188cc1 JA |
6954 | } |
6955 | ||
2b188cc1 | 6956 | /* |
dd9ae8a0 | 6957 | * Fetch an sqe, if one is available. Note this returns a pointer to memory |
2b188cc1 JA |
6958 | * that is mapped by userspace. This means that care needs to be taken to |
6959 | * ensure that reads are stable, as we cannot rely on userspace always | |
6960 | * being a good citizen. If members of the sqe are validated and then later | |
6961 | * used, it's important that those reads are done through READ_ONCE() to | |
6962 | * prevent a re-load down the line. | |
6963 | */ | |
709b302f | 6964 | static const struct io_uring_sqe *io_get_sqe(struct io_ring_ctx *ctx) |
2b188cc1 | 6965 | { |
ea5ab3b5 | 6966 | unsigned head, mask = ctx->sq_entries - 1; |
17d3aeb3 | 6967 | unsigned sq_idx = ctx->cached_sq_head++ & mask; |
2b188cc1 JA |
6968 | |
6969 | /* | |
6970 | * The cached sq head (or cq tail) serves two purposes: | |
6971 | * | |
6972 | * 1) allows us to batch the cost of updating the user visible | |
6973 | * head updates. | |
6974 | * 2) allows the kernel side to track the head on its own, even | |
6975 | * though the application is the one updating it. | |
6976 | */ | |
17d3aeb3 | 6977 | head = READ_ONCE(ctx->sq_array[sq_idx]); |
709b302f PB |
6978 | if (likely(head < ctx->sq_entries)) |
6979 | return &ctx->sq_sqes[head]; | |
2b188cc1 JA |
6980 | |
6981 | /* drop invalid entries */ | |
15641e42 PB |
6982 | ctx->cq_extra--; |
6983 | WRITE_ONCE(ctx->rings->sq_dropped, | |
6984 | READ_ONCE(ctx->rings->sq_dropped) + 1); | |
709b302f PB |
6985 | return NULL; |
6986 | } | |
6987 | ||
0f212204 | 6988 | static int io_submit_sqes(struct io_ring_ctx *ctx, unsigned int nr) |
282cdc86 | 6989 | __must_hold(&ctx->uring_lock) |
6c271ce2 | 6990 | { |
46c4e16a | 6991 | int submitted = 0; |
6c271ce2 | 6992 | |
ee7d46d9 PB |
6993 | /* make sure SQ entry isn't read before tail */ |
6994 | nr = min3(nr, ctx->sq_entries, io_sqring_entries(ctx)); | |
2b85edfc PB |
6995 | if (!percpu_ref_tryget_many(&ctx->refs, nr)) |
6996 | return -EAGAIN; | |
9a10867a | 6997 | io_get_task_refs(nr); |
6c271ce2 | 6998 | |
ba88ff11 | 6999 | io_submit_state_start(&ctx->submit_state, nr); |
46c4e16a | 7000 | while (submitted < nr) { |
3529d8c2 | 7001 | const struct io_uring_sqe *sqe; |
196be95c | 7002 | struct io_kiocb *req; |
fb5ccc98 | 7003 | |
258b29a9 | 7004 | req = io_alloc_req(ctx); |
196be95c PB |
7005 | if (unlikely(!req)) { |
7006 | if (!submitted) | |
7007 | submitted = -EAGAIN; | |
fb5ccc98 | 7008 | break; |
196be95c | 7009 | } |
4fccfcbb PB |
7010 | sqe = io_get_sqe(ctx); |
7011 | if (unlikely(!sqe)) { | |
0c6e1d7f | 7012 | list_add(&req->inflight_entry, &ctx->submit_state.free_list); |
4fccfcbb PB |
7013 | break; |
7014 | } | |
d3656344 JA |
7015 | /* will complete beyond this point, count as submitted */ |
7016 | submitted++; | |
a1ab7b35 | 7017 | if (io_submit_sqe(ctx, req, sqe)) |
196be95c | 7018 | break; |
6c271ce2 JA |
7019 | } |
7020 | ||
9466f437 PB |
7021 | if (unlikely(submitted != nr)) { |
7022 | int ref_used = (submitted == -EAGAIN) ? 0 : submitted; | |
d8a6df10 | 7023 | int unused = nr - ref_used; |
9466f437 | 7024 | |
09899b19 | 7025 | current->io_uring->cached_refs += unused; |
d8a6df10 | 7026 | percpu_ref_put_many(&ctx->refs, unused); |
9466f437 | 7027 | } |
6c271ce2 | 7028 | |
a1ab7b35 | 7029 | io_submit_state_end(&ctx->submit_state, ctx); |
ae9428ca PB |
7030 | /* Commit SQ ring head once we've consumed and submitted all SQEs */ |
7031 | io_commit_sqring(ctx); | |
7032 | ||
6c271ce2 JA |
7033 | return submitted; |
7034 | } | |
7035 | ||
e4b6d902 PB |
7036 | static inline bool io_sqd_events_pending(struct io_sq_data *sqd) |
7037 | { | |
7038 | return READ_ONCE(sqd->state); | |
7039 | } | |
7040 | ||
23b3628e XW |
7041 | static inline void io_ring_set_wakeup_flag(struct io_ring_ctx *ctx) |
7042 | { | |
7043 | /* Tell userspace we may need a wakeup call */ | |
79ebeaee | 7044 | spin_lock(&ctx->completion_lock); |
20c0b380 NA |
7045 | WRITE_ONCE(ctx->rings->sq_flags, |
7046 | ctx->rings->sq_flags | IORING_SQ_NEED_WAKEUP); | |
79ebeaee | 7047 | spin_unlock(&ctx->completion_lock); |
23b3628e XW |
7048 | } |
7049 | ||
7050 | static inline void io_ring_clear_wakeup_flag(struct io_ring_ctx *ctx) | |
7051 | { | |
79ebeaee | 7052 | spin_lock(&ctx->completion_lock); |
20c0b380 NA |
7053 | WRITE_ONCE(ctx->rings->sq_flags, |
7054 | ctx->rings->sq_flags & ~IORING_SQ_NEED_WAKEUP); | |
79ebeaee | 7055 | spin_unlock(&ctx->completion_lock); |
23b3628e XW |
7056 | } |
7057 | ||
08369246 | 7058 | static int __io_sq_thread(struct io_ring_ctx *ctx, bool cap_entries) |
6c271ce2 | 7059 | { |
c8d1ba58 | 7060 | unsigned int to_submit; |
bdcd3eab | 7061 | int ret = 0; |
6c271ce2 | 7062 | |
c8d1ba58 | 7063 | to_submit = io_sqring_entries(ctx); |
e95eee2d | 7064 | /* if we're handling multiple rings, cap submit size for fairness */ |
4ce8ad95 OL |
7065 | if (cap_entries && to_submit > IORING_SQPOLL_CAP_ENTRIES_VALUE) |
7066 | to_submit = IORING_SQPOLL_CAP_ENTRIES_VALUE; | |
e95eee2d | 7067 | |
906a3c6f | 7068 | if (!list_empty(&ctx->iopoll_list) || to_submit) { |
c8d1ba58 | 7069 | unsigned nr_events = 0; |
948e1947 PB |
7070 | const struct cred *creds = NULL; |
7071 | ||
7072 | if (ctx->sq_creds != current_cred()) | |
7073 | creds = override_creds(ctx->sq_creds); | |
a4c0b3de | 7074 | |
c8d1ba58 | 7075 | mutex_lock(&ctx->uring_lock); |
906a3c6f | 7076 | if (!list_empty(&ctx->iopoll_list)) |
a8576af9 | 7077 | io_do_iopoll(ctx, &nr_events, 0); |
906a3c6f | 7078 | |
3b763ba1 PB |
7079 | /* |
7080 | * Don't submit if refs are dying, good for io_uring_register(), | |
7081 | * but also it is relied upon by io_ring_exit_work() | |
7082 | */ | |
0298ef96 PB |
7083 | if (to_submit && likely(!percpu_ref_is_dying(&ctx->refs)) && |
7084 | !(ctx->flags & IORING_SETUP_R_DISABLED)) | |
08369246 | 7085 | ret = io_submit_sqes(ctx, to_submit); |
c8d1ba58 | 7086 | mutex_unlock(&ctx->uring_lock); |
6c271ce2 | 7087 | |
acfb381d PB |
7088 | if (to_submit && wq_has_sleeper(&ctx->sqo_sq_wait)) |
7089 | wake_up(&ctx->sqo_sq_wait); | |
948e1947 PB |
7090 | if (creds) |
7091 | revert_creds(creds); | |
acfb381d | 7092 | } |
6c271ce2 | 7093 | |
08369246 XW |
7094 | return ret; |
7095 | } | |
6c271ce2 | 7096 | |
08369246 XW |
7097 | static void io_sqd_update_thread_idle(struct io_sq_data *sqd) |
7098 | { | |
7099 | struct io_ring_ctx *ctx; | |
7100 | unsigned sq_thread_idle = 0; | |
6c271ce2 | 7101 | |
c9dca27d PB |
7102 | list_for_each_entry(ctx, &sqd->ctx_list, sqd_list) |
7103 | sq_thread_idle = max(sq_thread_idle, ctx->sq_thread_idle); | |
08369246 | 7104 | sqd->sq_thread_idle = sq_thread_idle; |
c8d1ba58 | 7105 | } |
6c271ce2 | 7106 | |
e4b6d902 PB |
7107 | static bool io_sqd_handle_event(struct io_sq_data *sqd) |
7108 | { | |
7109 | bool did_sig = false; | |
7110 | struct ksignal ksig; | |
7111 | ||
7112 | if (test_bit(IO_SQ_THREAD_SHOULD_PARK, &sqd->state) || | |
7113 | signal_pending(current)) { | |
7114 | mutex_unlock(&sqd->lock); | |
7115 | if (signal_pending(current)) | |
7116 | did_sig = get_signal(&ksig); | |
7117 | cond_resched(); | |
7118 | mutex_lock(&sqd->lock); | |
7119 | } | |
e4b6d902 PB |
7120 | return did_sig || test_bit(IO_SQ_THREAD_SHOULD_STOP, &sqd->state); |
7121 | } | |
7122 | ||
c8d1ba58 JA |
7123 | static int io_sq_thread(void *data) |
7124 | { | |
69fb2131 JA |
7125 | struct io_sq_data *sqd = data; |
7126 | struct io_ring_ctx *ctx; | |
a0d9205f | 7127 | unsigned long timeout = 0; |
37d1e2e3 | 7128 | char buf[TASK_COMM_LEN]; |
08369246 | 7129 | DEFINE_WAIT(wait); |
6c271ce2 | 7130 | |
696ee88a | 7131 | snprintf(buf, sizeof(buf), "iou-sqp-%d", sqd->task_pid); |
37d1e2e3 | 7132 | set_task_comm(current, buf); |
37d1e2e3 JA |
7133 | |
7134 | if (sqd->sq_cpu != -1) | |
7135 | set_cpus_allowed_ptr(current, cpumask_of(sqd->sq_cpu)); | |
7136 | else | |
7137 | set_cpus_allowed_ptr(current, cpu_online_mask); | |
7138 | current->flags |= PF_NO_SETAFFINITY; | |
7139 | ||
09a6f4ef | 7140 | mutex_lock(&sqd->lock); |
e4b6d902 | 7141 | while (1) { |
1a924a80 | 7142 | bool cap_entries, sqt_spin = false; |
c1edbf5f | 7143 | |
e4b6d902 PB |
7144 | if (io_sqd_events_pending(sqd) || signal_pending(current)) { |
7145 | if (io_sqd_handle_event(sqd)) | |
c7d95613 | 7146 | break; |
08369246 XW |
7147 | timeout = jiffies + sqd->sq_thread_idle; |
7148 | } | |
e4b6d902 | 7149 | |
e95eee2d | 7150 | cap_entries = !list_is_singular(&sqd->ctx_list); |
69fb2131 | 7151 | list_for_each_entry(ctx, &sqd->ctx_list, sqd_list) { |
948e1947 | 7152 | int ret = __io_sq_thread(ctx, cap_entries); |
7c30f36a | 7153 | |
08369246 XW |
7154 | if (!sqt_spin && (ret > 0 || !list_empty(&ctx->iopoll_list))) |
7155 | sqt_spin = true; | |
69fb2131 | 7156 | } |
dd432ea5 PB |
7157 | if (io_run_task_work()) |
7158 | sqt_spin = true; | |
6c271ce2 | 7159 | |
08369246 | 7160 | if (sqt_spin || !time_after(jiffies, timeout)) { |
c8d1ba58 | 7161 | cond_resched(); |
08369246 XW |
7162 | if (sqt_spin) |
7163 | timeout = jiffies + sqd->sq_thread_idle; | |
7164 | continue; | |
7165 | } | |
7166 | ||
08369246 | 7167 | prepare_to_wait(&sqd->wait, &wait, TASK_INTERRUPTIBLE); |
dd432ea5 | 7168 | if (!io_sqd_events_pending(sqd) && !current->task_works) { |
1a924a80 PB |
7169 | bool needs_sched = true; |
7170 | ||
724cb4f9 | 7171 | list_for_each_entry(ctx, &sqd->ctx_list, sqd_list) { |
aaa9f0f4 PB |
7172 | io_ring_set_wakeup_flag(ctx); |
7173 | ||
724cb4f9 HX |
7174 | if ((ctx->flags & IORING_SETUP_IOPOLL) && |
7175 | !list_empty_careful(&ctx->iopoll_list)) { | |
7176 | needs_sched = false; | |
7177 | break; | |
7178 | } | |
7179 | if (io_sqring_entries(ctx)) { | |
7180 | needs_sched = false; | |
7181 | break; | |
7182 | } | |
7183 | } | |
7184 | ||
7185 | if (needs_sched) { | |
7186 | mutex_unlock(&sqd->lock); | |
7187 | schedule(); | |
7188 | mutex_lock(&sqd->lock); | |
7189 | } | |
69fb2131 JA |
7190 | list_for_each_entry(ctx, &sqd->ctx_list, sqd_list) |
7191 | io_ring_clear_wakeup_flag(ctx); | |
6c271ce2 | 7192 | } |
08369246 XW |
7193 | |
7194 | finish_wait(&sqd->wait, &wait); | |
7195 | timeout = jiffies + sqd->sq_thread_idle; | |
6c271ce2 | 7196 | } |
28cea78a | 7197 | |
78cc687b | 7198 | io_uring_cancel_generic(true, sqd); |
37d1e2e3 | 7199 | sqd->thread = NULL; |
05962f95 | 7200 | list_for_each_entry(ctx, &sqd->ctx_list, sqd_list) |
5f3f26f9 | 7201 | io_ring_set_wakeup_flag(ctx); |
521d6a73 | 7202 | io_run_task_work(); |
734551df PB |
7203 | mutex_unlock(&sqd->lock); |
7204 | ||
37d1e2e3 JA |
7205 | complete(&sqd->exited); |
7206 | do_exit(0); | |
6c271ce2 JA |
7207 | } |
7208 | ||
bda52162 JA |
7209 | struct io_wait_queue { |
7210 | struct wait_queue_entry wq; | |
7211 | struct io_ring_ctx *ctx; | |
5fd46178 | 7212 | unsigned cq_tail; |
bda52162 JA |
7213 | unsigned nr_timeouts; |
7214 | }; | |
7215 | ||
6c503150 | 7216 | static inline bool io_should_wake(struct io_wait_queue *iowq) |
bda52162 JA |
7217 | { |
7218 | struct io_ring_ctx *ctx = iowq->ctx; | |
5fd46178 | 7219 | int dist = ctx->cached_cq_tail - (int) iowq->cq_tail; |
bda52162 JA |
7220 | |
7221 | /* | |
d195a66e | 7222 | * Wake up if we have enough events, or if a timeout occurred since we |
bda52162 JA |
7223 | * started waiting. For timeouts, we always want to return to userspace, |
7224 | * regardless of event count. | |
7225 | */ | |
5fd46178 | 7226 | return dist >= 0 || atomic_read(&ctx->cq_timeouts) != iowq->nr_timeouts; |
bda52162 JA |
7227 | } |
7228 | ||
7229 | static int io_wake_function(struct wait_queue_entry *curr, unsigned int mode, | |
7230 | int wake_flags, void *key) | |
7231 | { | |
7232 | struct io_wait_queue *iowq = container_of(curr, struct io_wait_queue, | |
7233 | wq); | |
7234 | ||
6c503150 PB |
7235 | /* |
7236 | * Cannot safely flush overflowed CQEs from here, ensure we wake up | |
7237 | * the task, and the next invocation will do it. | |
7238 | */ | |
5ed7a37d | 7239 | if (io_should_wake(iowq) || test_bit(0, &iowq->ctx->check_cq_overflow)) |
6c503150 PB |
7240 | return autoremove_wake_function(curr, mode, wake_flags, key); |
7241 | return -1; | |
bda52162 JA |
7242 | } |
7243 | ||
af9c1a44 JA |
7244 | static int io_run_task_work_sig(void) |
7245 | { | |
7246 | if (io_run_task_work()) | |
7247 | return 1; | |
7248 | if (!signal_pending(current)) | |
7249 | return 0; | |
0b8cfa97 | 7250 | if (test_thread_flag(TIF_NOTIFY_SIGNAL)) |
792ee0f6 | 7251 | return -ERESTARTSYS; |
af9c1a44 JA |
7252 | return -EINTR; |
7253 | } | |
7254 | ||
eeb60b9a PB |
7255 | /* when returns >0, the caller should retry */ |
7256 | static inline int io_cqring_wait_schedule(struct io_ring_ctx *ctx, | |
7257 | struct io_wait_queue *iowq, | |
7258 | signed long *timeout) | |
7259 | { | |
7260 | int ret; | |
7261 | ||
7262 | /* make sure we run task_work before checking for signals */ | |
7263 | ret = io_run_task_work_sig(); | |
7264 | if (ret || io_should_wake(iowq)) | |
7265 | return ret; | |
7266 | /* let the caller flush overflows, retry */ | |
5ed7a37d | 7267 | if (test_bit(0, &ctx->check_cq_overflow)) |
eeb60b9a PB |
7268 | return 1; |
7269 | ||
7270 | *timeout = schedule_timeout(*timeout); | |
7271 | return !*timeout ? -ETIME : 1; | |
7272 | } | |
7273 | ||
2b188cc1 JA |
7274 | /* |
7275 | * Wait until events become available, if we don't already have some. The | |
7276 | * application must reap them itself, as they reside on the shared cq ring. | |
7277 | */ | |
7278 | static int io_cqring_wait(struct io_ring_ctx *ctx, int min_events, | |
c73ebb68 HX |
7279 | const sigset_t __user *sig, size_t sigsz, |
7280 | struct __kernel_timespec __user *uts) | |
2b188cc1 | 7281 | { |
90291099 | 7282 | struct io_wait_queue iowq; |
75b28aff | 7283 | struct io_rings *rings = ctx->rings; |
c1d5a224 PB |
7284 | signed long timeout = MAX_SCHEDULE_TIMEOUT; |
7285 | int ret; | |
2b188cc1 | 7286 | |
b41e9852 | 7287 | do { |
90f67366 | 7288 | io_cqring_overflow_flush(ctx); |
6c503150 | 7289 | if (io_cqring_events(ctx) >= min_events) |
b41e9852 | 7290 | return 0; |
4c6e277c | 7291 | if (!io_run_task_work()) |
b41e9852 | 7292 | break; |
b41e9852 | 7293 | } while (1); |
2b188cc1 JA |
7294 | |
7295 | if (sig) { | |
9e75ad5d AB |
7296 | #ifdef CONFIG_COMPAT |
7297 | if (in_compat_syscall()) | |
7298 | ret = set_compat_user_sigmask((const compat_sigset_t __user *)sig, | |
b772434b | 7299 | sigsz); |
9e75ad5d AB |
7300 | else |
7301 | #endif | |
b772434b | 7302 | ret = set_user_sigmask(sig, sigsz); |
9e75ad5d | 7303 | |
2b188cc1 JA |
7304 | if (ret) |
7305 | return ret; | |
7306 | } | |
7307 | ||
c73ebb68 | 7308 | if (uts) { |
c1d5a224 PB |
7309 | struct timespec64 ts; |
7310 | ||
c73ebb68 HX |
7311 | if (get_timespec64(&ts, uts)) |
7312 | return -EFAULT; | |
7313 | timeout = timespec64_to_jiffies(&ts); | |
7314 | } | |
7315 | ||
90291099 PB |
7316 | init_waitqueue_func_entry(&iowq.wq, io_wake_function); |
7317 | iowq.wq.private = current; | |
7318 | INIT_LIST_HEAD(&iowq.wq.entry); | |
7319 | iowq.ctx = ctx; | |
bda52162 | 7320 | iowq.nr_timeouts = atomic_read(&ctx->cq_timeouts); |
5fd46178 | 7321 | iowq.cq_tail = READ_ONCE(ctx->rings->cq.head) + min_events; |
90291099 | 7322 | |
c826bd7a | 7323 | trace_io_uring_cqring_wait(ctx, min_events); |
bda52162 | 7324 | do { |
ca0a2651 | 7325 | /* if we can't even flush overflow, don't wait for more */ |
90f67366 | 7326 | if (!io_cqring_overflow_flush(ctx)) { |
ca0a2651 JA |
7327 | ret = -EBUSY; |
7328 | break; | |
7329 | } | |
311997b3 | 7330 | prepare_to_wait_exclusive(&ctx->cq_wait, &iowq.wq, |
bda52162 | 7331 | TASK_INTERRUPTIBLE); |
eeb60b9a | 7332 | ret = io_cqring_wait_schedule(ctx, &iowq, &timeout); |
311997b3 | 7333 | finish_wait(&ctx->cq_wait, &iowq.wq); |
ca0a2651 | 7334 | cond_resched(); |
eeb60b9a | 7335 | } while (ret > 0); |
bda52162 | 7336 | |
b7db41c9 | 7337 | restore_saved_sigmask_unless(ret == -EINTR); |
2b188cc1 | 7338 | |
75b28aff | 7339 | return READ_ONCE(rings->cq.head) == READ_ONCE(rings->cq.tail) ? ret : 0; |
2b188cc1 JA |
7340 | } |
7341 | ||
9123c8ff | 7342 | static void io_free_page_table(void **table, size_t size) |
05f3fb3c | 7343 | { |
9123c8ff | 7344 | unsigned i, nr_tables = DIV_ROUND_UP(size, PAGE_SIZE); |
05f3fb3c | 7345 | |
846a4ef2 | 7346 | for (i = 0; i < nr_tables; i++) |
9123c8ff PB |
7347 | kfree(table[i]); |
7348 | kfree(table); | |
7349 | } | |
7350 | ||
7351 | static void **io_alloc_page_table(size_t size) | |
7352 | { | |
7353 | unsigned i, nr_tables = DIV_ROUND_UP(size, PAGE_SIZE); | |
7354 | size_t init_size = size; | |
7355 | void **table; | |
7356 | ||
0bea96f5 | 7357 | table = kcalloc(nr_tables, sizeof(*table), GFP_KERNEL_ACCOUNT); |
9123c8ff PB |
7358 | if (!table) |
7359 | return NULL; | |
7360 | ||
7361 | for (i = 0; i < nr_tables; i++) { | |
27f6b318 | 7362 | unsigned int this_size = min_t(size_t, size, PAGE_SIZE); |
9123c8ff | 7363 | |
0bea96f5 | 7364 | table[i] = kzalloc(this_size, GFP_KERNEL_ACCOUNT); |
9123c8ff PB |
7365 | if (!table[i]) { |
7366 | io_free_page_table(table, init_size); | |
7367 | return NULL; | |
7368 | } | |
7369 | size -= this_size; | |
7370 | } | |
7371 | return table; | |
05f3fb3c JA |
7372 | } |
7373 | ||
28a9fe25 | 7374 | static void io_rsrc_node_destroy(struct io_rsrc_node *ref_node) |
1642b445 | 7375 | { |
28a9fe25 PB |
7376 | percpu_ref_exit(&ref_node->refs); |
7377 | kfree(ref_node); | |
1642b445 PB |
7378 | } |
7379 | ||
b9bd2bea PB |
7380 | static void io_rsrc_node_ref_zero(struct percpu_ref *ref) |
7381 | { | |
7382 | struct io_rsrc_node *node = container_of(ref, struct io_rsrc_node, refs); | |
7383 | struct io_ring_ctx *ctx = node->rsrc_data->ctx; | |
7384 | unsigned long flags; | |
7385 | bool first_add = false; | |
7386 | ||
7387 | spin_lock_irqsave(&ctx->rsrc_ref_lock, flags); | |
7388 | node->done = true; | |
7389 | ||
7390 | while (!list_empty(&ctx->rsrc_ref_list)) { | |
7391 | node = list_first_entry(&ctx->rsrc_ref_list, | |
7392 | struct io_rsrc_node, node); | |
7393 | /* recycle ref nodes in order */ | |
7394 | if (!node->done) | |
7395 | break; | |
7396 | list_del(&node->node); | |
7397 | first_add |= llist_add(&node->llist, &ctx->rsrc_put_llist); | |
7398 | } | |
7399 | spin_unlock_irqrestore(&ctx->rsrc_ref_lock, flags); | |
7400 | ||
7401 | if (first_add) | |
7402 | mod_delayed_work(system_wq, &ctx->rsrc_put_work, HZ); | |
7403 | } | |
7404 | ||
7405 | static struct io_rsrc_node *io_rsrc_node_alloc(struct io_ring_ctx *ctx) | |
7406 | { | |
7407 | struct io_rsrc_node *ref_node; | |
7408 | ||
7409 | ref_node = kzalloc(sizeof(*ref_node), GFP_KERNEL); | |
7410 | if (!ref_node) | |
7411 | return NULL; | |
7412 | ||
7413 | if (percpu_ref_init(&ref_node->refs, io_rsrc_node_ref_zero, | |
7414 | 0, GFP_KERNEL)) { | |
7415 | kfree(ref_node); | |
7416 | return NULL; | |
7417 | } | |
7418 | INIT_LIST_HEAD(&ref_node->node); | |
7419 | INIT_LIST_HEAD(&ref_node->rsrc_list); | |
7420 | ref_node->done = false; | |
7421 | return ref_node; | |
7422 | } | |
7423 | ||
a7f0ed5a PB |
7424 | static void io_rsrc_node_switch(struct io_ring_ctx *ctx, |
7425 | struct io_rsrc_data *data_to_kill) | |
6b06314c | 7426 | { |
a7f0ed5a PB |
7427 | WARN_ON_ONCE(!ctx->rsrc_backup_node); |
7428 | WARN_ON_ONCE(data_to_kill && !ctx->rsrc_node); | |
6b06314c | 7429 | |
a7f0ed5a PB |
7430 | if (data_to_kill) { |
7431 | struct io_rsrc_node *rsrc_node = ctx->rsrc_node; | |
82fbcfa9 | 7432 | |
a7f0ed5a | 7433 | rsrc_node->rsrc_data = data_to_kill; |
4956b9ea | 7434 | spin_lock_irq(&ctx->rsrc_ref_lock); |
a7f0ed5a | 7435 | list_add_tail(&rsrc_node->node, &ctx->rsrc_ref_list); |
4956b9ea | 7436 | spin_unlock_irq(&ctx->rsrc_ref_lock); |
82fbcfa9 | 7437 | |
3e942498 | 7438 | atomic_inc(&data_to_kill->refs); |
a7f0ed5a PB |
7439 | percpu_ref_kill(&rsrc_node->refs); |
7440 | ctx->rsrc_node = NULL; | |
7441 | } | |
6b06314c | 7442 | |
a7f0ed5a PB |
7443 | if (!ctx->rsrc_node) { |
7444 | ctx->rsrc_node = ctx->rsrc_backup_node; | |
7445 | ctx->rsrc_backup_node = NULL; | |
7446 | } | |
8bad28d8 HX |
7447 | } |
7448 | ||
a7f0ed5a | 7449 | static int io_rsrc_node_switch_start(struct io_ring_ctx *ctx) |
8dd03afe PB |
7450 | { |
7451 | if (ctx->rsrc_backup_node) | |
7452 | return 0; | |
b895c9a6 | 7453 | ctx->rsrc_backup_node = io_rsrc_node_alloc(ctx); |
8dd03afe | 7454 | return ctx->rsrc_backup_node ? 0 : -ENOMEM; |
8bad28d8 HX |
7455 | } |
7456 | ||
40ae0ff7 | 7457 | static int io_rsrc_ref_quiesce(struct io_rsrc_data *data, struct io_ring_ctx *ctx) |
8bad28d8 HX |
7458 | { |
7459 | int ret; | |
05589553 | 7460 | |
215c3902 | 7461 | /* As we may drop ->uring_lock, other task may have started quiesce */ |
8bad28d8 HX |
7462 | if (data->quiesce) |
7463 | return -ENXIO; | |
05589553 | 7464 | |
8bad28d8 | 7465 | data->quiesce = true; |
1ffc5422 | 7466 | do { |
a7f0ed5a | 7467 | ret = io_rsrc_node_switch_start(ctx); |
8dd03afe | 7468 | if (ret) |
f2303b1f | 7469 | break; |
a7f0ed5a | 7470 | io_rsrc_node_switch(ctx, data); |
f2303b1f | 7471 | |
3e942498 PB |
7472 | /* kill initial ref, already quiesced if zero */ |
7473 | if (atomic_dec_and_test(&data->refs)) | |
7474 | break; | |
c018db4a | 7475 | mutex_unlock(&ctx->uring_lock); |
8bad28d8 | 7476 | flush_delayed_work(&ctx->rsrc_put_work); |
1ffc5422 | 7477 | ret = wait_for_completion_interruptible(&data->done); |
c018db4a JA |
7478 | if (!ret) { |
7479 | mutex_lock(&ctx->uring_lock); | |
1ffc5422 | 7480 | break; |
c018db4a | 7481 | } |
8bad28d8 | 7482 | |
3e942498 PB |
7483 | atomic_inc(&data->refs); |
7484 | /* wait for all works potentially completing data->done */ | |
7485 | flush_delayed_work(&ctx->rsrc_put_work); | |
cb5e1b81 | 7486 | reinit_completion(&data->done); |
8dd03afe | 7487 | |
1ffc5422 | 7488 | ret = io_run_task_work_sig(); |
8bad28d8 | 7489 | mutex_lock(&ctx->uring_lock); |
f2303b1f | 7490 | } while (ret >= 0); |
8bad28d8 | 7491 | data->quiesce = false; |
05f3fb3c | 7492 | |
8bad28d8 | 7493 | return ret; |
d7954b2b BM |
7494 | } |
7495 | ||
2d091d62 PB |
7496 | static u64 *io_get_tag_slot(struct io_rsrc_data *data, unsigned int idx) |
7497 | { | |
7498 | unsigned int off = idx & IO_RSRC_TAG_TABLE_MASK; | |
7499 | unsigned int table_idx = idx >> IO_RSRC_TAG_TABLE_SHIFT; | |
7500 | ||
7501 | return &data->tags[table_idx][off]; | |
7502 | } | |
7503 | ||
44b31f2f | 7504 | static void io_rsrc_data_free(struct io_rsrc_data *data) |
1ad555c6 | 7505 | { |
2d091d62 PB |
7506 | size_t size = data->nr * sizeof(data->tags[0][0]); |
7507 | ||
7508 | if (data->tags) | |
7509 | io_free_page_table((void **)data->tags, size); | |
44b31f2f PB |
7510 | kfree(data); |
7511 | } | |
7512 | ||
d878c816 PB |
7513 | static int io_rsrc_data_alloc(struct io_ring_ctx *ctx, rsrc_put_fn *do_put, |
7514 | u64 __user *utags, unsigned nr, | |
7515 | struct io_rsrc_data **pdata) | |
1ad555c6 | 7516 | { |
b895c9a6 | 7517 | struct io_rsrc_data *data; |
2d091d62 | 7518 | int ret = -ENOMEM; |
d878c816 | 7519 | unsigned i; |
1ad555c6 BM |
7520 | |
7521 | data = kzalloc(sizeof(*data), GFP_KERNEL); | |
7522 | if (!data) | |
d878c816 | 7523 | return -ENOMEM; |
2d091d62 | 7524 | data->tags = (u64 **)io_alloc_page_table(nr * sizeof(data->tags[0][0])); |
b60c8dce | 7525 | if (!data->tags) { |
1ad555c6 | 7526 | kfree(data); |
d878c816 PB |
7527 | return -ENOMEM; |
7528 | } | |
2d091d62 PB |
7529 | |
7530 | data->nr = nr; | |
7531 | data->ctx = ctx; | |
7532 | data->do_put = do_put; | |
d878c816 | 7533 | if (utags) { |
2d091d62 | 7534 | ret = -EFAULT; |
d878c816 | 7535 | for (i = 0; i < nr; i++) { |
fdd1dc31 CIK |
7536 | u64 *tag_slot = io_get_tag_slot(data, i); |
7537 | ||
7538 | if (copy_from_user(tag_slot, &utags[i], | |
7539 | sizeof(*tag_slot))) | |
2d091d62 | 7540 | goto fail; |
d878c816 | 7541 | } |
1ad555c6 | 7542 | } |
b60c8dce | 7543 | |
3e942498 | 7544 | atomic_set(&data->refs, 1); |
1ad555c6 | 7545 | init_completion(&data->done); |
d878c816 PB |
7546 | *pdata = data; |
7547 | return 0; | |
2d091d62 PB |
7548 | fail: |
7549 | io_rsrc_data_free(data); | |
7550 | return ret; | |
1ad555c6 BM |
7551 | } |
7552 | ||
9123c8ff PB |
7553 | static bool io_alloc_file_tables(struct io_file_table *table, unsigned nr_files) |
7554 | { | |
0bea96f5 PB |
7555 | table->files = kvcalloc(nr_files, sizeof(table->files[0]), |
7556 | GFP_KERNEL_ACCOUNT); | |
9123c8ff PB |
7557 | return !!table->files; |
7558 | } | |
7559 | ||
042b0d85 | 7560 | static void io_free_file_tables(struct io_file_table *table) |
9123c8ff | 7561 | { |
042b0d85 | 7562 | kvfree(table->files); |
9123c8ff PB |
7563 | table->files = NULL; |
7564 | } | |
7565 | ||
fff4db76 | 7566 | static void __io_sqe_files_unregister(struct io_ring_ctx *ctx) |
1ad555c6 | 7567 | { |
fff4db76 PB |
7568 | #if defined(CONFIG_UNIX) |
7569 | if (ctx->ring_sock) { | |
7570 | struct sock *sock = ctx->ring_sock->sk; | |
7571 | struct sk_buff *skb; | |
7572 | ||
7573 | while ((skb = skb_dequeue(&sock->sk_receive_queue)) != NULL) | |
7574 | kfree_skb(skb); | |
7575 | } | |
7576 | #else | |
7577 | int i; | |
7578 | ||
7579 | for (i = 0; i < ctx->nr_user_files; i++) { | |
7580 | struct file *file; | |
7581 | ||
7582 | file = io_file_from_index(ctx, i); | |
7583 | if (file) | |
7584 | fput(file); | |
7585 | } | |
7586 | #endif | |
042b0d85 | 7587 | io_free_file_tables(&ctx->file_table); |
44b31f2f | 7588 | io_rsrc_data_free(ctx->file_data); |
fff4db76 PB |
7589 | ctx->file_data = NULL; |
7590 | ctx->nr_user_files = 0; | |
1ad555c6 BM |
7591 | } |
7592 | ||
d7954b2b BM |
7593 | static int io_sqe_files_unregister(struct io_ring_ctx *ctx) |
7594 | { | |
d7954b2b BM |
7595 | int ret; |
7596 | ||
08480400 | 7597 | if (!ctx->file_data) |
d7954b2b | 7598 | return -ENXIO; |
08480400 PB |
7599 | ret = io_rsrc_ref_quiesce(ctx->file_data, ctx); |
7600 | if (!ret) | |
7601 | __io_sqe_files_unregister(ctx); | |
7602 | return ret; | |
6b06314c JA |
7603 | } |
7604 | ||
37d1e2e3 | 7605 | static void io_sq_thread_unpark(struct io_sq_data *sqd) |
09a6f4ef | 7606 | __releases(&sqd->lock) |
37d1e2e3 | 7607 | { |
521d6a73 PB |
7608 | WARN_ON_ONCE(sqd->thread == current); |
7609 | ||
9e138a48 PB |
7610 | /* |
7611 | * Do the dance but not conditional clear_bit() because it'd race with | |
7612 | * other threads incrementing park_pending and setting the bit. | |
7613 | */ | |
37d1e2e3 | 7614 | clear_bit(IO_SQ_THREAD_SHOULD_PARK, &sqd->state); |
9e138a48 PB |
7615 | if (atomic_dec_return(&sqd->park_pending)) |
7616 | set_bit(IO_SQ_THREAD_SHOULD_PARK, &sqd->state); | |
09a6f4ef | 7617 | mutex_unlock(&sqd->lock); |
37d1e2e3 JA |
7618 | } |
7619 | ||
86e0d676 | 7620 | static void io_sq_thread_park(struct io_sq_data *sqd) |
09a6f4ef | 7621 | __acquires(&sqd->lock) |
37d1e2e3 | 7622 | { |
521d6a73 PB |
7623 | WARN_ON_ONCE(sqd->thread == current); |
7624 | ||
9e138a48 | 7625 | atomic_inc(&sqd->park_pending); |
86e0d676 | 7626 | set_bit(IO_SQ_THREAD_SHOULD_PARK, &sqd->state); |
09a6f4ef | 7627 | mutex_lock(&sqd->lock); |
05962f95 | 7628 | if (sqd->thread) |
86e0d676 | 7629 | wake_up_process(sqd->thread); |
37d1e2e3 JA |
7630 | } |
7631 | ||
7632 | static void io_sq_thread_stop(struct io_sq_data *sqd) | |
7633 | { | |
521d6a73 | 7634 | WARN_ON_ONCE(sqd->thread == current); |
88885f66 | 7635 | WARN_ON_ONCE(test_bit(IO_SQ_THREAD_SHOULD_STOP, &sqd->state)); |
521d6a73 | 7636 | |
05962f95 | 7637 | set_bit(IO_SQ_THREAD_SHOULD_STOP, &sqd->state); |
88885f66 | 7638 | mutex_lock(&sqd->lock); |
e8f98f24 JA |
7639 | if (sqd->thread) |
7640 | wake_up_process(sqd->thread); | |
09a6f4ef | 7641 | mutex_unlock(&sqd->lock); |
05962f95 | 7642 | wait_for_completion(&sqd->exited); |
37d1e2e3 JA |
7643 | } |
7644 | ||
534ca6d6 | 7645 | static void io_put_sq_data(struct io_sq_data *sqd) |
6c271ce2 | 7646 | { |
534ca6d6 | 7647 | if (refcount_dec_and_test(&sqd->refs)) { |
9e138a48 PB |
7648 | WARN_ON_ONCE(atomic_read(&sqd->park_pending)); |
7649 | ||
37d1e2e3 JA |
7650 | io_sq_thread_stop(sqd); |
7651 | kfree(sqd); | |
7652 | } | |
7653 | } | |
7654 | ||
7655 | static void io_sq_thread_finish(struct io_ring_ctx *ctx) | |
7656 | { | |
7657 | struct io_sq_data *sqd = ctx->sq_data; | |
7658 | ||
7659 | if (sqd) { | |
05962f95 | 7660 | io_sq_thread_park(sqd); |
521d6a73 | 7661 | list_del_init(&ctx->sqd_list); |
37d1e2e3 | 7662 | io_sqd_update_thread_idle(sqd); |
05962f95 | 7663 | io_sq_thread_unpark(sqd); |
37d1e2e3 JA |
7664 | |
7665 | io_put_sq_data(sqd); | |
7666 | ctx->sq_data = NULL; | |
534ca6d6 JA |
7667 | } |
7668 | } | |
7669 | ||
aa06165d JA |
7670 | static struct io_sq_data *io_attach_sq_data(struct io_uring_params *p) |
7671 | { | |
7672 | struct io_ring_ctx *ctx_attach; | |
7673 | struct io_sq_data *sqd; | |
7674 | struct fd f; | |
7675 | ||
7676 | f = fdget(p->wq_fd); | |
7677 | if (!f.file) | |
7678 | return ERR_PTR(-ENXIO); | |
7679 | if (f.file->f_op != &io_uring_fops) { | |
7680 | fdput(f); | |
7681 | return ERR_PTR(-EINVAL); | |
7682 | } | |
7683 | ||
7684 | ctx_attach = f.file->private_data; | |
7685 | sqd = ctx_attach->sq_data; | |
7686 | if (!sqd) { | |
7687 | fdput(f); | |
7688 | return ERR_PTR(-EINVAL); | |
7689 | } | |
5c2469e0 JA |
7690 | if (sqd->task_tgid != current->tgid) { |
7691 | fdput(f); | |
7692 | return ERR_PTR(-EPERM); | |
7693 | } | |
aa06165d JA |
7694 | |
7695 | refcount_inc(&sqd->refs); | |
7696 | fdput(f); | |
7697 | return sqd; | |
7698 | } | |
7699 | ||
26984fbf PB |
7700 | static struct io_sq_data *io_get_sq_data(struct io_uring_params *p, |
7701 | bool *attached) | |
534ca6d6 JA |
7702 | { |
7703 | struct io_sq_data *sqd; | |
7704 | ||
26984fbf | 7705 | *attached = false; |
5c2469e0 JA |
7706 | if (p->flags & IORING_SETUP_ATTACH_WQ) { |
7707 | sqd = io_attach_sq_data(p); | |
26984fbf PB |
7708 | if (!IS_ERR(sqd)) { |
7709 | *attached = true; | |
5c2469e0 | 7710 | return sqd; |
26984fbf | 7711 | } |
5c2469e0 JA |
7712 | /* fall through for EPERM case, setup new sqd/task */ |
7713 | if (PTR_ERR(sqd) != -EPERM) | |
7714 | return sqd; | |
7715 | } | |
aa06165d | 7716 | |
534ca6d6 JA |
7717 | sqd = kzalloc(sizeof(*sqd), GFP_KERNEL); |
7718 | if (!sqd) | |
7719 | return ERR_PTR(-ENOMEM); | |
7720 | ||
9e138a48 | 7721 | atomic_set(&sqd->park_pending, 0); |
534ca6d6 | 7722 | refcount_set(&sqd->refs, 1); |
69fb2131 | 7723 | INIT_LIST_HEAD(&sqd->ctx_list); |
09a6f4ef | 7724 | mutex_init(&sqd->lock); |
534ca6d6 | 7725 | init_waitqueue_head(&sqd->wait); |
37d1e2e3 | 7726 | init_completion(&sqd->exited); |
534ca6d6 JA |
7727 | return sqd; |
7728 | } | |
7729 | ||
6b06314c | 7730 | #if defined(CONFIG_UNIX) |
6b06314c JA |
7731 | /* |
7732 | * Ensure the UNIX gc is aware of our file set, so we are certain that | |
7733 | * the io_uring can be safely unregistered on process exit, even if we have | |
7734 | * loops in the file referencing. | |
7735 | */ | |
7736 | static int __io_sqe_files_scm(struct io_ring_ctx *ctx, int nr, int offset) | |
7737 | { | |
7738 | struct sock *sk = ctx->ring_sock->sk; | |
7739 | struct scm_fp_list *fpl; | |
7740 | struct sk_buff *skb; | |
08a45173 | 7741 | int i, nr_files; |
6b06314c | 7742 | |
6b06314c JA |
7743 | fpl = kzalloc(sizeof(*fpl), GFP_KERNEL); |
7744 | if (!fpl) | |
7745 | return -ENOMEM; | |
7746 | ||
7747 | skb = alloc_skb(0, GFP_KERNEL); | |
7748 | if (!skb) { | |
7749 | kfree(fpl); | |
7750 | return -ENOMEM; | |
7751 | } | |
7752 | ||
7753 | skb->sk = sk; | |
6b06314c | 7754 | |
08a45173 | 7755 | nr_files = 0; |
62e398be | 7756 | fpl->user = get_uid(current_user()); |
6b06314c | 7757 | for (i = 0; i < nr; i++) { |
65e19f54 JA |
7758 | struct file *file = io_file_from_index(ctx, i + offset); |
7759 | ||
7760 | if (!file) | |
08a45173 | 7761 | continue; |
65e19f54 | 7762 | fpl->fp[nr_files] = get_file(file); |
08a45173 JA |
7763 | unix_inflight(fpl->user, fpl->fp[nr_files]); |
7764 | nr_files++; | |
6b06314c JA |
7765 | } |
7766 | ||
08a45173 JA |
7767 | if (nr_files) { |
7768 | fpl->max = SCM_MAX_FD; | |
7769 | fpl->count = nr_files; | |
7770 | UNIXCB(skb).fp = fpl; | |
05f3fb3c | 7771 | skb->destructor = unix_destruct_scm; |
08a45173 JA |
7772 | refcount_add(skb->truesize, &sk->sk_wmem_alloc); |
7773 | skb_queue_head(&sk->sk_receive_queue, skb); | |
6b06314c | 7774 | |
08a45173 JA |
7775 | for (i = 0; i < nr_files; i++) |
7776 | fput(fpl->fp[i]); | |
7777 | } else { | |
7778 | kfree_skb(skb); | |
7779 | kfree(fpl); | |
7780 | } | |
6b06314c JA |
7781 | |
7782 | return 0; | |
7783 | } | |
7784 | ||
7785 | /* | |
7786 | * If UNIX sockets are enabled, fd passing can cause a reference cycle which | |
7787 | * causes regular reference counting to break down. We rely on the UNIX | |
7788 | * garbage collection to take care of this problem for us. | |
7789 | */ | |
7790 | static int io_sqe_files_scm(struct io_ring_ctx *ctx) | |
7791 | { | |
7792 | unsigned left, total; | |
7793 | int ret = 0; | |
7794 | ||
7795 | total = 0; | |
7796 | left = ctx->nr_user_files; | |
7797 | while (left) { | |
7798 | unsigned this_files = min_t(unsigned, left, SCM_MAX_FD); | |
6b06314c JA |
7799 | |
7800 | ret = __io_sqe_files_scm(ctx, this_files, total); | |
7801 | if (ret) | |
7802 | break; | |
7803 | left -= this_files; | |
7804 | total += this_files; | |
7805 | } | |
7806 | ||
7807 | if (!ret) | |
7808 | return 0; | |
7809 | ||
7810 | while (total < ctx->nr_user_files) { | |
65e19f54 JA |
7811 | struct file *file = io_file_from_index(ctx, total); |
7812 | ||
7813 | if (file) | |
7814 | fput(file); | |
6b06314c JA |
7815 | total++; |
7816 | } | |
7817 | ||
7818 | return ret; | |
7819 | } | |
7820 | #else | |
7821 | static int io_sqe_files_scm(struct io_ring_ctx *ctx) | |
7822 | { | |
7823 | return 0; | |
7824 | } | |
7825 | #endif | |
7826 | ||
47e90392 | 7827 | static void io_rsrc_file_put(struct io_ring_ctx *ctx, struct io_rsrc_put *prsrc) |
05f3fb3c | 7828 | { |
50238531 | 7829 | struct file *file = prsrc->file; |
05f3fb3c JA |
7830 | #if defined(CONFIG_UNIX) |
7831 | struct sock *sock = ctx->ring_sock->sk; | |
7832 | struct sk_buff_head list, *head = &sock->sk_receive_queue; | |
7833 | struct sk_buff *skb; | |
7834 | int i; | |
7835 | ||
7836 | __skb_queue_head_init(&list); | |
7837 | ||
7838 | /* | |
7839 | * Find the skb that holds this file in its SCM_RIGHTS. When found, | |
7840 | * remove this entry and rearrange the file array. | |
7841 | */ | |
7842 | skb = skb_dequeue(head); | |
7843 | while (skb) { | |
7844 | struct scm_fp_list *fp; | |
7845 | ||
7846 | fp = UNIXCB(skb).fp; | |
7847 | for (i = 0; i < fp->count; i++) { | |
7848 | int left; | |
7849 | ||
7850 | if (fp->fp[i] != file) | |
7851 | continue; | |
7852 | ||
7853 | unix_notinflight(fp->user, fp->fp[i]); | |
7854 | left = fp->count - 1 - i; | |
7855 | if (left) { | |
7856 | memmove(&fp->fp[i], &fp->fp[i + 1], | |
7857 | left * sizeof(struct file *)); | |
7858 | } | |
7859 | fp->count--; | |
7860 | if (!fp->count) { | |
7861 | kfree_skb(skb); | |
7862 | skb = NULL; | |
7863 | } else { | |
7864 | __skb_queue_tail(&list, skb); | |
7865 | } | |
7866 | fput(file); | |
7867 | file = NULL; | |
7868 | break; | |
7869 | } | |
7870 | ||
7871 | if (!file) | |
7872 | break; | |
7873 | ||
7874 | __skb_queue_tail(&list, skb); | |
7875 | ||
7876 | skb = skb_dequeue(head); | |
7877 | } | |
7878 | ||
7879 | if (skb_peek(&list)) { | |
7880 | spin_lock_irq(&head->lock); | |
7881 | while ((skb = __skb_dequeue(&list)) != NULL) | |
7882 | __skb_queue_tail(head, skb); | |
7883 | spin_unlock_irq(&head->lock); | |
7884 | } | |
7885 | #else | |
7886 | fput(file); | |
7887 | #endif | |
7888 | } | |
7889 | ||
b895c9a6 | 7890 | static void __io_rsrc_put_work(struct io_rsrc_node *ref_node) |
65e19f54 | 7891 | { |
b895c9a6 | 7892 | struct io_rsrc_data *rsrc_data = ref_node->rsrc_data; |
269bbe5f BM |
7893 | struct io_ring_ctx *ctx = rsrc_data->ctx; |
7894 | struct io_rsrc_put *prsrc, *tmp; | |
05589553 | 7895 | |
269bbe5f BM |
7896 | list_for_each_entry_safe(prsrc, tmp, &ref_node->rsrc_list, list) { |
7897 | list_del(&prsrc->list); | |
b60c8dce PB |
7898 | |
7899 | if (prsrc->tag) { | |
7900 | bool lock_ring = ctx->flags & IORING_SETUP_IOPOLL; | |
b60c8dce PB |
7901 | |
7902 | io_ring_submit_lock(ctx, lock_ring); | |
79ebeaee | 7903 | spin_lock(&ctx->completion_lock); |
b60c8dce | 7904 | io_cqring_fill_event(ctx, prsrc->tag, 0, 0); |
2840f710 | 7905 | ctx->cq_extra++; |
b60c8dce | 7906 | io_commit_cqring(ctx); |
79ebeaee | 7907 | spin_unlock(&ctx->completion_lock); |
b60c8dce PB |
7908 | io_cqring_ev_posted(ctx); |
7909 | io_ring_submit_unlock(ctx, lock_ring); | |
7910 | } | |
7911 | ||
40ae0ff7 | 7912 | rsrc_data->do_put(ctx, prsrc); |
269bbe5f | 7913 | kfree(prsrc); |
65e19f54 | 7914 | } |
05589553 | 7915 | |
28a9fe25 | 7916 | io_rsrc_node_destroy(ref_node); |
3e942498 PB |
7917 | if (atomic_dec_and_test(&rsrc_data->refs)) |
7918 | complete(&rsrc_data->done); | |
2faf852d | 7919 | } |
65e19f54 | 7920 | |
269bbe5f | 7921 | static void io_rsrc_put_work(struct work_struct *work) |
4a38aed2 JA |
7922 | { |
7923 | struct io_ring_ctx *ctx; | |
7924 | struct llist_node *node; | |
7925 | ||
269bbe5f BM |
7926 | ctx = container_of(work, struct io_ring_ctx, rsrc_put_work.work); |
7927 | node = llist_del_all(&ctx->rsrc_put_llist); | |
4a38aed2 JA |
7928 | |
7929 | while (node) { | |
b895c9a6 | 7930 | struct io_rsrc_node *ref_node; |
4a38aed2 JA |
7931 | struct llist_node *next = node->next; |
7932 | ||
b895c9a6 | 7933 | ref_node = llist_entry(node, struct io_rsrc_node, llist); |
269bbe5f | 7934 | __io_rsrc_put_work(ref_node); |
4a38aed2 JA |
7935 | node = next; |
7936 | } | |
7937 | } | |
7938 | ||
6b06314c | 7939 | static int io_sqe_files_register(struct io_ring_ctx *ctx, void __user *arg, |
792e3582 | 7940 | unsigned nr_args, u64 __user *tags) |
6b06314c JA |
7941 | { |
7942 | __s32 __user *fds = (__s32 __user *) arg; | |
05f3fb3c | 7943 | struct file *file; |
f3baed39 | 7944 | int fd, ret; |
846a4ef2 | 7945 | unsigned i; |
6b06314c | 7946 | |
05f3fb3c | 7947 | if (ctx->file_data) |
6b06314c JA |
7948 | return -EBUSY; |
7949 | if (!nr_args) | |
7950 | return -EINVAL; | |
7951 | if (nr_args > IORING_MAX_FIXED_FILES) | |
7952 | return -EMFILE; | |
3a1b8a4e PB |
7953 | if (nr_args > rlimit(RLIMIT_NOFILE)) |
7954 | return -EMFILE; | |
a7f0ed5a | 7955 | ret = io_rsrc_node_switch_start(ctx); |
f3baed39 PB |
7956 | if (ret) |
7957 | return ret; | |
d878c816 PB |
7958 | ret = io_rsrc_data_alloc(ctx, io_rsrc_file_put, tags, nr_args, |
7959 | &ctx->file_data); | |
7960 | if (ret) | |
7961 | return ret; | |
6b06314c | 7962 | |
f3baed39 | 7963 | ret = -ENOMEM; |
aeca241b | 7964 | if (!io_alloc_file_tables(&ctx->file_table, nr_args)) |
1ad555c6 | 7965 | goto out_free; |
65e19f54 | 7966 | |
08a45173 | 7967 | for (i = 0; i < nr_args; i++, ctx->nr_user_files++) { |
d878c816 | 7968 | if (copy_from_user(&fd, &fds[i], sizeof(fd))) { |
600cf3f8 PB |
7969 | ret = -EFAULT; |
7970 | goto out_fput; | |
7971 | } | |
08a45173 | 7972 | /* allow sparse sets */ |
792e3582 PB |
7973 | if (fd == -1) { |
7974 | ret = -EINVAL; | |
2d091d62 | 7975 | if (unlikely(*io_get_tag_slot(ctx->file_data, i))) |
792e3582 | 7976 | goto out_fput; |
08a45173 | 7977 | continue; |
792e3582 | 7978 | } |
6b06314c | 7979 | |
05f3fb3c | 7980 | file = fget(fd); |
6b06314c | 7981 | ret = -EBADF; |
792e3582 | 7982 | if (unlikely(!file)) |
600cf3f8 | 7983 | goto out_fput; |
05f3fb3c | 7984 | |
6b06314c JA |
7985 | /* |
7986 | * Don't allow io_uring instances to be registered. If UNIX | |
7987 | * isn't enabled, then this causes a reference cycle and this | |
7988 | * instance can never get freed. If UNIX is enabled we'll | |
7989 | * handle it just fine, but there's still no point in allowing | |
7990 | * a ring fd as it doesn't support regular read/write anyway. | |
7991 | */ | |
05f3fb3c JA |
7992 | if (file->f_op == &io_uring_fops) { |
7993 | fput(file); | |
600cf3f8 | 7994 | goto out_fput; |
6b06314c | 7995 | } |
aeca241b | 7996 | io_fixed_file_set(io_fixed_file_slot(&ctx->file_table, i), file); |
6b06314c JA |
7997 | } |
7998 | ||
6b06314c | 7999 | ret = io_sqe_files_scm(ctx); |
05589553 | 8000 | if (ret) { |
08480400 | 8001 | __io_sqe_files_unregister(ctx); |
05589553 XW |
8002 | return ret; |
8003 | } | |
6b06314c | 8004 | |
a7f0ed5a | 8005 | io_rsrc_node_switch(ctx, NULL); |
6b06314c | 8006 | return ret; |
600cf3f8 PB |
8007 | out_fput: |
8008 | for (i = 0; i < ctx->nr_user_files; i++) { | |
8009 | file = io_file_from_index(ctx, i); | |
8010 | if (file) | |
8011 | fput(file); | |
8012 | } | |
042b0d85 | 8013 | io_free_file_tables(&ctx->file_table); |
600cf3f8 | 8014 | ctx->nr_user_files = 0; |
600cf3f8 | 8015 | out_free: |
44b31f2f | 8016 | io_rsrc_data_free(ctx->file_data); |
55cbc256 | 8017 | ctx->file_data = NULL; |
6b06314c JA |
8018 | return ret; |
8019 | } | |
8020 | ||
c3a31e60 JA |
8021 | static int io_sqe_file_register(struct io_ring_ctx *ctx, struct file *file, |
8022 | int index) | |
8023 | { | |
8024 | #if defined(CONFIG_UNIX) | |
8025 | struct sock *sock = ctx->ring_sock->sk; | |
8026 | struct sk_buff_head *head = &sock->sk_receive_queue; | |
8027 | struct sk_buff *skb; | |
8028 | ||
8029 | /* | |
8030 | * See if we can merge this file into an existing skb SCM_RIGHTS | |
8031 | * file set. If there's no room, fall back to allocating a new skb | |
8032 | * and filling it in. | |
8033 | */ | |
8034 | spin_lock_irq(&head->lock); | |
8035 | skb = skb_peek(head); | |
8036 | if (skb) { | |
8037 | struct scm_fp_list *fpl = UNIXCB(skb).fp; | |
8038 | ||
8039 | if (fpl->count < SCM_MAX_FD) { | |
8040 | __skb_unlink(skb, head); | |
8041 | spin_unlock_irq(&head->lock); | |
8042 | fpl->fp[fpl->count] = get_file(file); | |
8043 | unix_inflight(fpl->user, fpl->fp[fpl->count]); | |
8044 | fpl->count++; | |
8045 | spin_lock_irq(&head->lock); | |
8046 | __skb_queue_head(head, skb); | |
8047 | } else { | |
8048 | skb = NULL; | |
8049 | } | |
8050 | } | |
8051 | spin_unlock_irq(&head->lock); | |
8052 | ||
8053 | if (skb) { | |
8054 | fput(file); | |
8055 | return 0; | |
8056 | } | |
8057 | ||
8058 | return __io_sqe_files_scm(ctx, 1, index); | |
8059 | #else | |
8060 | return 0; | |
8061 | #endif | |
8062 | } | |
8063 | ||
b9445598 PB |
8064 | static int io_install_fixed_file(struct io_kiocb *req, struct file *file, |
8065 | unsigned int issue_flags, u32 slot_index) | |
8066 | { | |
8067 | struct io_ring_ctx *ctx = req->ctx; | |
8068 | bool force_nonblock = issue_flags & IO_URING_F_NONBLOCK; | |
8069 | struct io_fixed_file *file_slot; | |
8070 | int ret = -EBADF; | |
8071 | ||
8072 | io_ring_submit_lock(ctx, !force_nonblock); | |
8073 | if (file->f_op == &io_uring_fops) | |
8074 | goto err; | |
8075 | ret = -ENXIO; | |
8076 | if (!ctx->file_data) | |
8077 | goto err; | |
8078 | ret = -EINVAL; | |
8079 | if (slot_index >= ctx->nr_user_files) | |
8080 | goto err; | |
8081 | ||
8082 | slot_index = array_index_nospec(slot_index, ctx->nr_user_files); | |
8083 | file_slot = io_fixed_file_slot(&ctx->file_table, slot_index); | |
8084 | ret = -EBADF; | |
8085 | if (file_slot->file_ptr) | |
8086 | goto err; | |
8087 | ||
8088 | *io_get_tag_slot(ctx->file_data, slot_index) = 0; | |
8089 | io_fixed_file_set(file_slot, file); | |
8090 | ret = io_sqe_file_register(ctx, file, slot_index); | |
8091 | if (ret) { | |
8092 | file_slot->file_ptr = 0; | |
8093 | goto err; | |
8094 | } | |
8095 | ||
8096 | ret = 0; | |
8097 | err: | |
8098 | io_ring_submit_unlock(ctx, !force_nonblock); | |
8099 | if (ret) | |
8100 | fput(file); | |
8101 | return ret; | |
8102 | } | |
8103 | ||
b60c8dce | 8104 | static int io_queue_rsrc_removal(struct io_rsrc_data *data, unsigned idx, |
e7c78371 | 8105 | struct io_rsrc_node *node, void *rsrc) |
05f3fb3c | 8106 | { |
269bbe5f | 8107 | struct io_rsrc_put *prsrc; |
05f3fb3c | 8108 | |
269bbe5f BM |
8109 | prsrc = kzalloc(sizeof(*prsrc), GFP_KERNEL); |
8110 | if (!prsrc) | |
a5318d3c | 8111 | return -ENOMEM; |
05f3fb3c | 8112 | |
2d091d62 | 8113 | prsrc->tag = *io_get_tag_slot(data, idx); |
50238531 | 8114 | prsrc->rsrc = rsrc; |
e7c78371 | 8115 | list_add(&prsrc->list, &node->rsrc_list); |
a5318d3c | 8116 | return 0; |
05f3fb3c JA |
8117 | } |
8118 | ||
8119 | static int __io_sqe_files_update(struct io_ring_ctx *ctx, | |
c3bdad02 | 8120 | struct io_uring_rsrc_update2 *up, |
05f3fb3c JA |
8121 | unsigned nr_args) |
8122 | { | |
c3bdad02 | 8123 | u64 __user *tags = u64_to_user_ptr(up->tags); |
98f0b3b4 | 8124 | __s32 __user *fds = u64_to_user_ptr(up->data); |
b895c9a6 | 8125 | struct io_rsrc_data *data = ctx->file_data; |
a04b0ac0 PB |
8126 | struct io_fixed_file *file_slot; |
8127 | struct file *file; | |
98f0b3b4 PB |
8128 | int fd, i, err = 0; |
8129 | unsigned int done; | |
05589553 | 8130 | bool needs_switch = false; |
c3a31e60 | 8131 | |
98f0b3b4 PB |
8132 | if (!ctx->file_data) |
8133 | return -ENXIO; | |
8134 | if (up->offset + nr_args > ctx->nr_user_files) | |
c3a31e60 JA |
8135 | return -EINVAL; |
8136 | ||
67973b93 | 8137 | for (done = 0; done < nr_args; done++) { |
c3bdad02 PB |
8138 | u64 tag = 0; |
8139 | ||
8140 | if ((tags && copy_from_user(&tag, &tags[done], sizeof(tag))) || | |
8141 | copy_from_user(&fd, &fds[done], sizeof(fd))) { | |
c3a31e60 JA |
8142 | err = -EFAULT; |
8143 | break; | |
8144 | } | |
c3bdad02 PB |
8145 | if ((fd == IORING_REGISTER_FILES_SKIP || fd == -1) && tag) { |
8146 | err = -EINVAL; | |
8147 | break; | |
8148 | } | |
4e0377a1 | 8149 | if (fd == IORING_REGISTER_FILES_SKIP) |
8150 | continue; | |
8151 | ||
67973b93 | 8152 | i = array_index_nospec(up->offset + done, ctx->nr_user_files); |
aeca241b | 8153 | file_slot = io_fixed_file_slot(&ctx->file_table, i); |
ea64ec02 | 8154 | |
a04b0ac0 PB |
8155 | if (file_slot->file_ptr) { |
8156 | file = (struct file *)(file_slot->file_ptr & FFS_MASK); | |
b60c8dce PB |
8157 | err = io_queue_rsrc_removal(data, up->offset + done, |
8158 | ctx->rsrc_node, file); | |
a5318d3c HD |
8159 | if (err) |
8160 | break; | |
a04b0ac0 | 8161 | file_slot->file_ptr = 0; |
05589553 | 8162 | needs_switch = true; |
c3a31e60 JA |
8163 | } |
8164 | if (fd != -1) { | |
c3a31e60 JA |
8165 | file = fget(fd); |
8166 | if (!file) { | |
8167 | err = -EBADF; | |
8168 | break; | |
8169 | } | |
8170 | /* | |
8171 | * Don't allow io_uring instances to be registered. If | |
8172 | * UNIX isn't enabled, then this causes a reference | |
8173 | * cycle and this instance can never get freed. If UNIX | |
8174 | * is enabled we'll handle it just fine, but there's | |
8175 | * still no point in allowing a ring fd as it doesn't | |
8176 | * support regular read/write anyway. | |
8177 | */ | |
8178 | if (file->f_op == &io_uring_fops) { | |
8179 | fput(file); | |
8180 | err = -EBADF; | |
8181 | break; | |
8182 | } | |
2d091d62 | 8183 | *io_get_tag_slot(data, up->offset + done) = tag; |
9a321c98 | 8184 | io_fixed_file_set(file_slot, file); |
c3a31e60 | 8185 | err = io_sqe_file_register(ctx, file, i); |
f3bd9dae | 8186 | if (err) { |
a04b0ac0 | 8187 | file_slot->file_ptr = 0; |
f3bd9dae | 8188 | fput(file); |
c3a31e60 | 8189 | break; |
f3bd9dae | 8190 | } |
c3a31e60 | 8191 | } |
05f3fb3c JA |
8192 | } |
8193 | ||
a7f0ed5a PB |
8194 | if (needs_switch) |
8195 | io_rsrc_node_switch(ctx, data); | |
c3a31e60 JA |
8196 | return done ? done : err; |
8197 | } | |
05589553 | 8198 | |
685fe7fe JA |
8199 | static struct io_wq *io_init_wq_offload(struct io_ring_ctx *ctx, |
8200 | struct task_struct *task) | |
24369c2e | 8201 | { |
e941894e | 8202 | struct io_wq_hash *hash; |
24369c2e | 8203 | struct io_wq_data data; |
24369c2e | 8204 | unsigned int concurrency; |
24369c2e | 8205 | |
362a9e65 | 8206 | mutex_lock(&ctx->uring_lock); |
e941894e JA |
8207 | hash = ctx->hash_map; |
8208 | if (!hash) { | |
8209 | hash = kzalloc(sizeof(*hash), GFP_KERNEL); | |
362a9e65 YY |
8210 | if (!hash) { |
8211 | mutex_unlock(&ctx->uring_lock); | |
e941894e | 8212 | return ERR_PTR(-ENOMEM); |
362a9e65 | 8213 | } |
e941894e JA |
8214 | refcount_set(&hash->refs, 1); |
8215 | init_waitqueue_head(&hash->wait); | |
8216 | ctx->hash_map = hash; | |
24369c2e | 8217 | } |
362a9e65 | 8218 | mutex_unlock(&ctx->uring_lock); |
24369c2e | 8219 | |
e941894e | 8220 | data.hash = hash; |
685fe7fe | 8221 | data.task = task; |
ebc11b6c | 8222 | data.free_work = io_wq_free_work; |
f5fa38c5 | 8223 | data.do_work = io_wq_submit_work; |
24369c2e | 8224 | |
d25e3a3d JA |
8225 | /* Do QD, or 4 * CPUS, whatever is smallest */ |
8226 | concurrency = min(ctx->sq_entries, 4 * num_online_cpus()); | |
24369c2e | 8227 | |
5aa75ed5 | 8228 | return io_wq_create(concurrency, &data); |
24369c2e PB |
8229 | } |
8230 | ||
5aa75ed5 JA |
8231 | static int io_uring_alloc_task_context(struct task_struct *task, |
8232 | struct io_ring_ctx *ctx) | |
0f212204 JA |
8233 | { |
8234 | struct io_uring_task *tctx; | |
d8a6df10 | 8235 | int ret; |
0f212204 | 8236 | |
09899b19 | 8237 | tctx = kzalloc(sizeof(*tctx), GFP_KERNEL); |
0f212204 JA |
8238 | if (unlikely(!tctx)) |
8239 | return -ENOMEM; | |
8240 | ||
d8a6df10 JA |
8241 | ret = percpu_counter_init(&tctx->inflight, 0, GFP_KERNEL); |
8242 | if (unlikely(ret)) { | |
8243 | kfree(tctx); | |
8244 | return ret; | |
8245 | } | |
8246 | ||
685fe7fe | 8247 | tctx->io_wq = io_init_wq_offload(ctx, task); |
5aa75ed5 JA |
8248 | if (IS_ERR(tctx->io_wq)) { |
8249 | ret = PTR_ERR(tctx->io_wq); | |
8250 | percpu_counter_destroy(&tctx->inflight); | |
8251 | kfree(tctx); | |
8252 | return ret; | |
8253 | } | |
8254 | ||
0f212204 JA |
8255 | xa_init(&tctx->xa); |
8256 | init_waitqueue_head(&tctx->wait); | |
fdaf083c | 8257 | atomic_set(&tctx->in_idle, 0); |
b303fe2e | 8258 | atomic_set(&tctx->inflight_tracked, 0); |
0f212204 | 8259 | task->io_uring = tctx; |
7cbf1722 JA |
8260 | spin_lock_init(&tctx->task_lock); |
8261 | INIT_WQ_LIST(&tctx->task_list); | |
7cbf1722 | 8262 | init_task_work(&tctx->task_work, tctx_task_work); |
0f212204 JA |
8263 | return 0; |
8264 | } | |
8265 | ||
8266 | void __io_uring_free(struct task_struct *tsk) | |
8267 | { | |
8268 | struct io_uring_task *tctx = tsk->io_uring; | |
8269 | ||
8270 | WARN_ON_ONCE(!xa_empty(&tctx->xa)); | |
ef8eaa4e | 8271 | WARN_ON_ONCE(tctx->io_wq); |
09899b19 | 8272 | WARN_ON_ONCE(tctx->cached_refs); |
ef8eaa4e | 8273 | |
d8a6df10 | 8274 | percpu_counter_destroy(&tctx->inflight); |
0f212204 JA |
8275 | kfree(tctx); |
8276 | tsk->io_uring = NULL; | |
8277 | } | |
8278 | ||
7e84e1c7 SG |
8279 | static int io_sq_offload_create(struct io_ring_ctx *ctx, |
8280 | struct io_uring_params *p) | |
2b188cc1 JA |
8281 | { |
8282 | int ret; | |
8283 | ||
d25e3a3d JA |
8284 | /* Retain compatibility with failing for an invalid attach attempt */ |
8285 | if ((ctx->flags & (IORING_SETUP_ATTACH_WQ | IORING_SETUP_SQPOLL)) == | |
8286 | IORING_SETUP_ATTACH_WQ) { | |
8287 | struct fd f; | |
8288 | ||
8289 | f = fdget(p->wq_fd); | |
8290 | if (!f.file) | |
8291 | return -ENXIO; | |
0cc936f7 JA |
8292 | if (f.file->f_op != &io_uring_fops) { |
8293 | fdput(f); | |
f2a48dd0 | 8294 | return -EINVAL; |
0cc936f7 JA |
8295 | } |
8296 | fdput(f); | |
d25e3a3d | 8297 | } |
6c271ce2 | 8298 | if (ctx->flags & IORING_SETUP_SQPOLL) { |
46fe18b1 | 8299 | struct task_struct *tsk; |
534ca6d6 | 8300 | struct io_sq_data *sqd; |
26984fbf | 8301 | bool attached; |
534ca6d6 | 8302 | |
26984fbf | 8303 | sqd = io_get_sq_data(p, &attached); |
534ca6d6 JA |
8304 | if (IS_ERR(sqd)) { |
8305 | ret = PTR_ERR(sqd); | |
8306 | goto err; | |
8307 | } | |
69fb2131 | 8308 | |
7c30f36a | 8309 | ctx->sq_creds = get_current_cred(); |
534ca6d6 | 8310 | ctx->sq_data = sqd; |
917257da JA |
8311 | ctx->sq_thread_idle = msecs_to_jiffies(p->sq_thread_idle); |
8312 | if (!ctx->sq_thread_idle) | |
8313 | ctx->sq_thread_idle = HZ; | |
8314 | ||
78d7f6ba | 8315 | io_sq_thread_park(sqd); |
de75a3d3 PB |
8316 | list_add(&ctx->sqd_list, &sqd->ctx_list); |
8317 | io_sqd_update_thread_idle(sqd); | |
26984fbf | 8318 | /* don't attach to a dying SQPOLL thread, would be racy */ |
f2a48dd0 | 8319 | ret = (attached && !sqd->thread) ? -ENXIO : 0; |
78d7f6ba PB |
8320 | io_sq_thread_unpark(sqd); |
8321 | ||
de75a3d3 PB |
8322 | if (ret < 0) |
8323 | goto err; | |
8324 | if (attached) | |
5aa75ed5 | 8325 | return 0; |
aa06165d | 8326 | |
6c271ce2 | 8327 | if (p->flags & IORING_SETUP_SQ_AFF) { |
44a9bd18 | 8328 | int cpu = p->sq_thread_cpu; |
6c271ce2 | 8329 | |
917257da | 8330 | ret = -EINVAL; |
f2a48dd0 | 8331 | if (cpu >= nr_cpu_ids || !cpu_online(cpu)) |
e8f98f24 | 8332 | goto err_sqpoll; |
37d1e2e3 | 8333 | sqd->sq_cpu = cpu; |
6c271ce2 | 8334 | } else { |
37d1e2e3 | 8335 | sqd->sq_cpu = -1; |
6c271ce2 | 8336 | } |
37d1e2e3 JA |
8337 | |
8338 | sqd->task_pid = current->pid; | |
5c2469e0 | 8339 | sqd->task_tgid = current->tgid; |
46fe18b1 JA |
8340 | tsk = create_io_thread(io_sq_thread, sqd, NUMA_NO_NODE); |
8341 | if (IS_ERR(tsk)) { | |
8342 | ret = PTR_ERR(tsk); | |
e8f98f24 | 8343 | goto err_sqpoll; |
6c271ce2 | 8344 | } |
97a73a0f | 8345 | |
46fe18b1 | 8346 | sqd->thread = tsk; |
97a73a0f | 8347 | ret = io_uring_alloc_task_context(tsk, ctx); |
46fe18b1 | 8348 | wake_up_new_task(tsk); |
0f212204 JA |
8349 | if (ret) |
8350 | goto err; | |
6c271ce2 JA |
8351 | } else if (p->flags & IORING_SETUP_SQ_AFF) { |
8352 | /* Can't have SQ_AFF without SQPOLL */ | |
8353 | ret = -EINVAL; | |
8354 | goto err; | |
8355 | } | |
8356 | ||
2b188cc1 | 8357 | return 0; |
f2a48dd0 PB |
8358 | err_sqpoll: |
8359 | complete(&ctx->sq_data->exited); | |
2b188cc1 | 8360 | err: |
37d1e2e3 | 8361 | io_sq_thread_finish(ctx); |
2b188cc1 JA |
8362 | return ret; |
8363 | } | |
8364 | ||
a087e2b5 BM |
8365 | static inline void __io_unaccount_mem(struct user_struct *user, |
8366 | unsigned long nr_pages) | |
2b188cc1 JA |
8367 | { |
8368 | atomic_long_sub(nr_pages, &user->locked_vm); | |
8369 | } | |
8370 | ||
a087e2b5 BM |
8371 | static inline int __io_account_mem(struct user_struct *user, |
8372 | unsigned long nr_pages) | |
2b188cc1 JA |
8373 | { |
8374 | unsigned long page_limit, cur_pages, new_pages; | |
8375 | ||
8376 | /* Don't allow more pages than we can safely lock */ | |
8377 | page_limit = rlimit(RLIMIT_MEMLOCK) >> PAGE_SHIFT; | |
8378 | ||
8379 | do { | |
8380 | cur_pages = atomic_long_read(&user->locked_vm); | |
8381 | new_pages = cur_pages + nr_pages; | |
8382 | if (new_pages > page_limit) | |
8383 | return -ENOMEM; | |
8384 | } while (atomic_long_cmpxchg(&user->locked_vm, cur_pages, | |
8385 | new_pages) != cur_pages); | |
8386 | ||
8387 | return 0; | |
8388 | } | |
8389 | ||
26bfa89e | 8390 | static void io_unaccount_mem(struct io_ring_ctx *ctx, unsigned long nr_pages) |
a087e2b5 | 8391 | { |
62e398be | 8392 | if (ctx->user) |
a087e2b5 | 8393 | __io_unaccount_mem(ctx->user, nr_pages); |
30975825 | 8394 | |
26bfa89e JA |
8395 | if (ctx->mm_account) |
8396 | atomic64_sub(nr_pages, &ctx->mm_account->pinned_vm); | |
a087e2b5 BM |
8397 | } |
8398 | ||
26bfa89e | 8399 | static int io_account_mem(struct io_ring_ctx *ctx, unsigned long nr_pages) |
a087e2b5 | 8400 | { |
30975825 BM |
8401 | int ret; |
8402 | ||
62e398be | 8403 | if (ctx->user) { |
30975825 BM |
8404 | ret = __io_account_mem(ctx->user, nr_pages); |
8405 | if (ret) | |
8406 | return ret; | |
8407 | } | |
8408 | ||
26bfa89e JA |
8409 | if (ctx->mm_account) |
8410 | atomic64_add(nr_pages, &ctx->mm_account->pinned_vm); | |
a087e2b5 BM |
8411 | |
8412 | return 0; | |
8413 | } | |
8414 | ||
2b188cc1 JA |
8415 | static void io_mem_free(void *ptr) |
8416 | { | |
52e04ef4 MR |
8417 | struct page *page; |
8418 | ||
8419 | if (!ptr) | |
8420 | return; | |
2b188cc1 | 8421 | |
52e04ef4 | 8422 | page = virt_to_head_page(ptr); |
2b188cc1 JA |
8423 | if (put_page_testzero(page)) |
8424 | free_compound_page(page); | |
8425 | } | |
8426 | ||
8427 | static void *io_mem_alloc(size_t size) | |
8428 | { | |
8429 | gfp_t gfp_flags = GFP_KERNEL | __GFP_ZERO | __GFP_NOWARN | __GFP_COMP | | |
26bfa89e | 8430 | __GFP_NORETRY | __GFP_ACCOUNT; |
2b188cc1 JA |
8431 | |
8432 | return (void *) __get_free_pages(gfp_flags, get_order(size)); | |
8433 | } | |
8434 | ||
75b28aff HV |
8435 | static unsigned long rings_size(unsigned sq_entries, unsigned cq_entries, |
8436 | size_t *sq_offset) | |
8437 | { | |
8438 | struct io_rings *rings; | |
8439 | size_t off, sq_array_size; | |
8440 | ||
8441 | off = struct_size(rings, cqes, cq_entries); | |
8442 | if (off == SIZE_MAX) | |
8443 | return SIZE_MAX; | |
8444 | ||
8445 | #ifdef CONFIG_SMP | |
8446 | off = ALIGN(off, SMP_CACHE_BYTES); | |
8447 | if (off == 0) | |
8448 | return SIZE_MAX; | |
8449 | #endif | |
8450 | ||
b36200f5 DV |
8451 | if (sq_offset) |
8452 | *sq_offset = off; | |
8453 | ||
75b28aff HV |
8454 | sq_array_size = array_size(sizeof(u32), sq_entries); |
8455 | if (sq_array_size == SIZE_MAX) | |
8456 | return SIZE_MAX; | |
8457 | ||
8458 | if (check_add_overflow(off, sq_array_size, &off)) | |
8459 | return SIZE_MAX; | |
8460 | ||
75b28aff HV |
8461 | return off; |
8462 | } | |
8463 | ||
41edf1a5 | 8464 | static void io_buffer_unmap(struct io_ring_ctx *ctx, struct io_mapped_ubuf **slot) |
7f61a1e9 | 8465 | { |
41edf1a5 | 8466 | struct io_mapped_ubuf *imu = *slot; |
7f61a1e9 PB |
8467 | unsigned int i; |
8468 | ||
6224843d PB |
8469 | if (imu != ctx->dummy_ubuf) { |
8470 | for (i = 0; i < imu->nr_bvecs; i++) | |
8471 | unpin_user_page(imu->bvec[i].bv_page); | |
8472 | if (imu->acct_pages) | |
8473 | io_unaccount_mem(ctx, imu->acct_pages); | |
8474 | kvfree(imu); | |
8475 | } | |
41edf1a5 | 8476 | *slot = NULL; |
7f61a1e9 PB |
8477 | } |
8478 | ||
bd54b6fe | 8479 | static void io_rsrc_buf_put(struct io_ring_ctx *ctx, struct io_rsrc_put *prsrc) |
edafccee | 8480 | { |
634d00df PB |
8481 | io_buffer_unmap(ctx, &prsrc->buf); |
8482 | prsrc->buf = NULL; | |
bd54b6fe | 8483 | } |
edafccee | 8484 | |
bd54b6fe BM |
8485 | static void __io_sqe_buffers_unregister(struct io_ring_ctx *ctx) |
8486 | { | |
8487 | unsigned int i; | |
edafccee | 8488 | |
7f61a1e9 PB |
8489 | for (i = 0; i < ctx->nr_user_bufs; i++) |
8490 | io_buffer_unmap(ctx, &ctx->user_bufs[i]); | |
edafccee | 8491 | kfree(ctx->user_bufs); |
bb6659cc | 8492 | io_rsrc_data_free(ctx->buf_data); |
edafccee | 8493 | ctx->user_bufs = NULL; |
bd54b6fe | 8494 | ctx->buf_data = NULL; |
edafccee | 8495 | ctx->nr_user_bufs = 0; |
bd54b6fe BM |
8496 | } |
8497 | ||
0a96bbe4 | 8498 | static int io_sqe_buffers_unregister(struct io_ring_ctx *ctx) |
edafccee | 8499 | { |
bd54b6fe | 8500 | int ret; |
edafccee | 8501 | |
bd54b6fe | 8502 | if (!ctx->buf_data) |
edafccee JA |
8503 | return -ENXIO; |
8504 | ||
bd54b6fe BM |
8505 | ret = io_rsrc_ref_quiesce(ctx->buf_data, ctx); |
8506 | if (!ret) | |
8507 | __io_sqe_buffers_unregister(ctx); | |
8508 | return ret; | |
edafccee JA |
8509 | } |
8510 | ||
8511 | static int io_copy_iov(struct io_ring_ctx *ctx, struct iovec *dst, | |
8512 | void __user *arg, unsigned index) | |
8513 | { | |
8514 | struct iovec __user *src; | |
8515 | ||
8516 | #ifdef CONFIG_COMPAT | |
8517 | if (ctx->compat) { | |
8518 | struct compat_iovec __user *ciovs; | |
8519 | struct compat_iovec ciov; | |
8520 | ||
8521 | ciovs = (struct compat_iovec __user *) arg; | |
8522 | if (copy_from_user(&ciov, &ciovs[index], sizeof(ciov))) | |
8523 | return -EFAULT; | |
8524 | ||
d55e5f5b | 8525 | dst->iov_base = u64_to_user_ptr((u64)ciov.iov_base); |
edafccee JA |
8526 | dst->iov_len = ciov.iov_len; |
8527 | return 0; | |
8528 | } | |
8529 | #endif | |
8530 | src = (struct iovec __user *) arg; | |
8531 | if (copy_from_user(dst, &src[index], sizeof(*dst))) | |
8532 | return -EFAULT; | |
8533 | return 0; | |
8534 | } | |
8535 | ||
de293938 JA |
8536 | /* |
8537 | * Not super efficient, but this is just a registration time. And we do cache | |
8538 | * the last compound head, so generally we'll only do a full search if we don't | |
8539 | * match that one. | |
8540 | * | |
8541 | * We check if the given compound head page has already been accounted, to | |
8542 | * avoid double accounting it. This allows us to account the full size of the | |
8543 | * page, not just the constituent pages of a huge page. | |
8544 | */ | |
8545 | static bool headpage_already_acct(struct io_ring_ctx *ctx, struct page **pages, | |
8546 | int nr_pages, struct page *hpage) | |
8547 | { | |
8548 | int i, j; | |
8549 | ||
8550 | /* check current page array */ | |
8551 | for (i = 0; i < nr_pages; i++) { | |
8552 | if (!PageCompound(pages[i])) | |
8553 | continue; | |
8554 | if (compound_head(pages[i]) == hpage) | |
8555 | return true; | |
8556 | } | |
8557 | ||
8558 | /* check previously registered pages */ | |
8559 | for (i = 0; i < ctx->nr_user_bufs; i++) { | |
41edf1a5 | 8560 | struct io_mapped_ubuf *imu = ctx->user_bufs[i]; |
de293938 JA |
8561 | |
8562 | for (j = 0; j < imu->nr_bvecs; j++) { | |
8563 | if (!PageCompound(imu->bvec[j].bv_page)) | |
8564 | continue; | |
8565 | if (compound_head(imu->bvec[j].bv_page) == hpage) | |
8566 | return true; | |
8567 | } | |
8568 | } | |
8569 | ||
8570 | return false; | |
8571 | } | |
8572 | ||
8573 | static int io_buffer_account_pin(struct io_ring_ctx *ctx, struct page **pages, | |
8574 | int nr_pages, struct io_mapped_ubuf *imu, | |
8575 | struct page **last_hpage) | |
8576 | { | |
8577 | int i, ret; | |
8578 | ||
216e5835 | 8579 | imu->acct_pages = 0; |
de293938 JA |
8580 | for (i = 0; i < nr_pages; i++) { |
8581 | if (!PageCompound(pages[i])) { | |
8582 | imu->acct_pages++; | |
8583 | } else { | |
8584 | struct page *hpage; | |
8585 | ||
8586 | hpage = compound_head(pages[i]); | |
8587 | if (hpage == *last_hpage) | |
8588 | continue; | |
8589 | *last_hpage = hpage; | |
8590 | if (headpage_already_acct(ctx, pages, i, hpage)) | |
8591 | continue; | |
8592 | imu->acct_pages += page_size(hpage) >> PAGE_SHIFT; | |
8593 | } | |
8594 | } | |
8595 | ||
8596 | if (!imu->acct_pages) | |
8597 | return 0; | |
8598 | ||
26bfa89e | 8599 | ret = io_account_mem(ctx, imu->acct_pages); |
de293938 JA |
8600 | if (ret) |
8601 | imu->acct_pages = 0; | |
8602 | return ret; | |
8603 | } | |
8604 | ||
0a96bbe4 | 8605 | static int io_sqe_buffer_register(struct io_ring_ctx *ctx, struct iovec *iov, |
41edf1a5 | 8606 | struct io_mapped_ubuf **pimu, |
0a96bbe4 | 8607 | struct page **last_hpage) |
edafccee | 8608 | { |
41edf1a5 | 8609 | struct io_mapped_ubuf *imu = NULL; |
edafccee JA |
8610 | struct vm_area_struct **vmas = NULL; |
8611 | struct page **pages = NULL; | |
0a96bbe4 BM |
8612 | unsigned long off, start, end, ubuf; |
8613 | size_t size; | |
8614 | int ret, pret, nr_pages, i; | |
8615 | ||
6224843d PB |
8616 | if (!iov->iov_base) { |
8617 | *pimu = ctx->dummy_ubuf; | |
8618 | return 0; | |
8619 | } | |
8620 | ||
0a96bbe4 BM |
8621 | ubuf = (unsigned long) iov->iov_base; |
8622 | end = (ubuf + iov->iov_len + PAGE_SIZE - 1) >> PAGE_SHIFT; | |
8623 | start = ubuf >> PAGE_SHIFT; | |
8624 | nr_pages = end - start; | |
8625 | ||
41edf1a5 | 8626 | *pimu = NULL; |
0a96bbe4 BM |
8627 | ret = -ENOMEM; |
8628 | ||
8629 | pages = kvmalloc_array(nr_pages, sizeof(struct page *), GFP_KERNEL); | |
8630 | if (!pages) | |
8631 | goto done; | |
8632 | ||
8633 | vmas = kvmalloc_array(nr_pages, sizeof(struct vm_area_struct *), | |
8634 | GFP_KERNEL); | |
8635 | if (!vmas) | |
8636 | goto done; | |
edafccee | 8637 | |
41edf1a5 | 8638 | imu = kvmalloc(struct_size(imu, bvec, nr_pages), GFP_KERNEL); |
a2b4198c | 8639 | if (!imu) |
0a96bbe4 BM |
8640 | goto done; |
8641 | ||
8642 | ret = 0; | |
8643 | mmap_read_lock(current->mm); | |
8644 | pret = pin_user_pages(ubuf, nr_pages, FOLL_WRITE | FOLL_LONGTERM, | |
8645 | pages, vmas); | |
8646 | if (pret == nr_pages) { | |
8647 | /* don't support file backed memory */ | |
8648 | for (i = 0; i < nr_pages; i++) { | |
8649 | struct vm_area_struct *vma = vmas[i]; | |
8650 | ||
40dad765 PB |
8651 | if (vma_is_shmem(vma)) |
8652 | continue; | |
0a96bbe4 BM |
8653 | if (vma->vm_file && |
8654 | !is_file_hugepages(vma->vm_file)) { | |
8655 | ret = -EOPNOTSUPP; | |
8656 | break; | |
8657 | } | |
8658 | } | |
8659 | } else { | |
8660 | ret = pret < 0 ? pret : -EFAULT; | |
8661 | } | |
8662 | mmap_read_unlock(current->mm); | |
8663 | if (ret) { | |
8664 | /* | |
8665 | * if we did partial map, or found file backed vmas, | |
8666 | * release any pages we did get | |
8667 | */ | |
8668 | if (pret > 0) | |
8669 | unpin_user_pages(pages, pret); | |
0a96bbe4 BM |
8670 | goto done; |
8671 | } | |
8672 | ||
8673 | ret = io_buffer_account_pin(ctx, pages, pret, imu, last_hpage); | |
8674 | if (ret) { | |
8675 | unpin_user_pages(pages, pret); | |
0a96bbe4 BM |
8676 | goto done; |
8677 | } | |
8678 | ||
8679 | off = ubuf & ~PAGE_MASK; | |
8680 | size = iov->iov_len; | |
8681 | for (i = 0; i < nr_pages; i++) { | |
8682 | size_t vec_len; | |
8683 | ||
8684 | vec_len = min_t(size_t, size, PAGE_SIZE - off); | |
8685 | imu->bvec[i].bv_page = pages[i]; | |
8686 | imu->bvec[i].bv_len = vec_len; | |
8687 | imu->bvec[i].bv_offset = off; | |
8688 | off = 0; | |
8689 | size -= vec_len; | |
8690 | } | |
8691 | /* store original address for later verification */ | |
8692 | imu->ubuf = ubuf; | |
4751f53d | 8693 | imu->ubuf_end = ubuf + iov->iov_len; |
0a96bbe4 | 8694 | imu->nr_bvecs = nr_pages; |
41edf1a5 | 8695 | *pimu = imu; |
0a96bbe4 BM |
8696 | ret = 0; |
8697 | done: | |
41edf1a5 PB |
8698 | if (ret) |
8699 | kvfree(imu); | |
0a96bbe4 BM |
8700 | kvfree(pages); |
8701 | kvfree(vmas); | |
8702 | return ret; | |
8703 | } | |
8704 | ||
2b358604 | 8705 | static int io_buffers_map_alloc(struct io_ring_ctx *ctx, unsigned int nr_args) |
0a96bbe4 | 8706 | { |
87094465 PB |
8707 | ctx->user_bufs = kcalloc(nr_args, sizeof(*ctx->user_bufs), GFP_KERNEL); |
8708 | return ctx->user_bufs ? 0 : -ENOMEM; | |
2b358604 | 8709 | } |
edafccee | 8710 | |
2b358604 BM |
8711 | static int io_buffer_validate(struct iovec *iov) |
8712 | { | |
50e96989 PB |
8713 | unsigned long tmp, acct_len = iov->iov_len + (PAGE_SIZE - 1); |
8714 | ||
2b358604 BM |
8715 | /* |
8716 | * Don't impose further limits on the size and buffer | |
8717 | * constraints here, we'll -EINVAL later when IO is | |
8718 | * submitted if they are wrong. | |
8719 | */ | |
6224843d PB |
8720 | if (!iov->iov_base) |
8721 | return iov->iov_len ? -EFAULT : 0; | |
8722 | if (!iov->iov_len) | |
2b358604 | 8723 | return -EFAULT; |
edafccee | 8724 | |
2b358604 BM |
8725 | /* arbitrary limit, but we need something */ |
8726 | if (iov->iov_len > SZ_1G) | |
8727 | return -EFAULT; | |
edafccee | 8728 | |
50e96989 PB |
8729 | if (check_add_overflow((unsigned long)iov->iov_base, acct_len, &tmp)) |
8730 | return -EOVERFLOW; | |
8731 | ||
2b358604 BM |
8732 | return 0; |
8733 | } | |
edafccee | 8734 | |
2b358604 | 8735 | static int io_sqe_buffers_register(struct io_ring_ctx *ctx, void __user *arg, |
634d00df | 8736 | unsigned int nr_args, u64 __user *tags) |
2b358604 | 8737 | { |
bd54b6fe BM |
8738 | struct page *last_hpage = NULL; |
8739 | struct io_rsrc_data *data; | |
2b358604 BM |
8740 | int i, ret; |
8741 | struct iovec iov; | |
edafccee | 8742 | |
87094465 PB |
8743 | if (ctx->user_bufs) |
8744 | return -EBUSY; | |
489809e2 | 8745 | if (!nr_args || nr_args > IORING_MAX_REG_BUFFERS) |
87094465 | 8746 | return -EINVAL; |
bd54b6fe | 8747 | ret = io_rsrc_node_switch_start(ctx); |
2b358604 BM |
8748 | if (ret) |
8749 | return ret; | |
d878c816 PB |
8750 | ret = io_rsrc_data_alloc(ctx, io_rsrc_buf_put, tags, nr_args, &data); |
8751 | if (ret) | |
8752 | return ret; | |
bd54b6fe BM |
8753 | ret = io_buffers_map_alloc(ctx, nr_args); |
8754 | if (ret) { | |
bb6659cc | 8755 | io_rsrc_data_free(data); |
bd54b6fe BM |
8756 | return ret; |
8757 | } | |
edafccee | 8758 | |
87094465 | 8759 | for (i = 0; i < nr_args; i++, ctx->nr_user_bufs++) { |
edafccee JA |
8760 | ret = io_copy_iov(ctx, &iov, arg, i); |
8761 | if (ret) | |
0a96bbe4 | 8762 | break; |
2b358604 BM |
8763 | ret = io_buffer_validate(&iov); |
8764 | if (ret) | |
0a96bbe4 | 8765 | break; |
2d091d62 | 8766 | if (!iov.iov_base && *io_get_tag_slot(data, i)) { |
cf3770e7 CIK |
8767 | ret = -EINVAL; |
8768 | break; | |
8769 | } | |
edafccee | 8770 | |
41edf1a5 PB |
8771 | ret = io_sqe_buffer_register(ctx, &iov, &ctx->user_bufs[i], |
8772 | &last_hpage); | |
0a96bbe4 BM |
8773 | if (ret) |
8774 | break; | |
edafccee | 8775 | } |
0a96bbe4 | 8776 | |
bd54b6fe | 8777 | WARN_ON_ONCE(ctx->buf_data); |
0a96bbe4 | 8778 | |
bd54b6fe BM |
8779 | ctx->buf_data = data; |
8780 | if (ret) | |
8781 | __io_sqe_buffers_unregister(ctx); | |
8782 | else | |
8783 | io_rsrc_node_switch(ctx, NULL); | |
edafccee JA |
8784 | return ret; |
8785 | } | |
8786 | ||
634d00df PB |
8787 | static int __io_sqe_buffers_update(struct io_ring_ctx *ctx, |
8788 | struct io_uring_rsrc_update2 *up, | |
8789 | unsigned int nr_args) | |
8790 | { | |
8791 | u64 __user *tags = u64_to_user_ptr(up->tags); | |
8792 | struct iovec iov, __user *iovs = u64_to_user_ptr(up->data); | |
634d00df PB |
8793 | struct page *last_hpage = NULL; |
8794 | bool needs_switch = false; | |
8795 | __u32 done; | |
8796 | int i, err; | |
8797 | ||
8798 | if (!ctx->buf_data) | |
8799 | return -ENXIO; | |
8800 | if (up->offset + nr_args > ctx->nr_user_bufs) | |
8801 | return -EINVAL; | |
8802 | ||
8803 | for (done = 0; done < nr_args; done++) { | |
0b8c0e7c PB |
8804 | struct io_mapped_ubuf *imu; |
8805 | int offset = up->offset + done; | |
634d00df PB |
8806 | u64 tag = 0; |
8807 | ||
8808 | err = io_copy_iov(ctx, &iov, iovs, done); | |
8809 | if (err) | |
8810 | break; | |
8811 | if (tags && copy_from_user(&tag, &tags[done], sizeof(tag))) { | |
8812 | err = -EFAULT; | |
8813 | break; | |
8814 | } | |
0b8c0e7c PB |
8815 | err = io_buffer_validate(&iov); |
8816 | if (err) | |
8817 | break; | |
cf3770e7 CIK |
8818 | if (!iov.iov_base && tag) { |
8819 | err = -EINVAL; | |
8820 | break; | |
8821 | } | |
0b8c0e7c PB |
8822 | err = io_sqe_buffer_register(ctx, &iov, &imu, &last_hpage); |
8823 | if (err) | |
8824 | break; | |
634d00df | 8825 | |
0b8c0e7c | 8826 | i = array_index_nospec(offset, ctx->nr_user_bufs); |
6224843d | 8827 | if (ctx->user_bufs[i] != ctx->dummy_ubuf) { |
0b8c0e7c PB |
8828 | err = io_queue_rsrc_removal(ctx->buf_data, offset, |
8829 | ctx->rsrc_node, ctx->user_bufs[i]); | |
8830 | if (unlikely(err)) { | |
8831 | io_buffer_unmap(ctx, &imu); | |
634d00df | 8832 | break; |
0b8c0e7c | 8833 | } |
634d00df PB |
8834 | ctx->user_bufs[i] = NULL; |
8835 | needs_switch = true; | |
8836 | } | |
8837 | ||
0b8c0e7c | 8838 | ctx->user_bufs[i] = imu; |
2d091d62 | 8839 | *io_get_tag_slot(ctx->buf_data, offset) = tag; |
634d00df PB |
8840 | } |
8841 | ||
8842 | if (needs_switch) | |
8843 | io_rsrc_node_switch(ctx, ctx->buf_data); | |
8844 | return done ? done : err; | |
8845 | } | |
8846 | ||
9b402849 JA |
8847 | static int io_eventfd_register(struct io_ring_ctx *ctx, void __user *arg) |
8848 | { | |
8849 | __s32 __user *fds = arg; | |
8850 | int fd; | |
8851 | ||
8852 | if (ctx->cq_ev_fd) | |
8853 | return -EBUSY; | |
8854 | ||
8855 | if (copy_from_user(&fd, fds, sizeof(*fds))) | |
8856 | return -EFAULT; | |
8857 | ||
8858 | ctx->cq_ev_fd = eventfd_ctx_fdget(fd); | |
8859 | if (IS_ERR(ctx->cq_ev_fd)) { | |
8860 | int ret = PTR_ERR(ctx->cq_ev_fd); | |
fe7e3257 | 8861 | |
9b402849 JA |
8862 | ctx->cq_ev_fd = NULL; |
8863 | return ret; | |
8864 | } | |
8865 | ||
8866 | return 0; | |
8867 | } | |
8868 | ||
8869 | static int io_eventfd_unregister(struct io_ring_ctx *ctx) | |
8870 | { | |
8871 | if (ctx->cq_ev_fd) { | |
8872 | eventfd_ctx_put(ctx->cq_ev_fd); | |
8873 | ctx->cq_ev_fd = NULL; | |
8874 | return 0; | |
8875 | } | |
8876 | ||
8877 | return -ENXIO; | |
8878 | } | |
8879 | ||
5a2e745d JA |
8880 | static void io_destroy_buffers(struct io_ring_ctx *ctx) |
8881 | { | |
9e15c3a0 JA |
8882 | struct io_buffer *buf; |
8883 | unsigned long index; | |
8884 | ||
8885 | xa_for_each(&ctx->io_buffers, index, buf) | |
8886 | __io_remove_buffers(ctx, buf, index, -1U); | |
5a2e745d JA |
8887 | } |
8888 | ||
7255834e | 8889 | static void io_req_cache_free(struct list_head *list) |
1b4c351f | 8890 | { |
68e68ee6 | 8891 | struct io_kiocb *req, *nxt; |
1b4c351f | 8892 | |
bb943b82 PB |
8893 | list_for_each_entry_safe(req, nxt, list, inflight_entry) { |
8894 | list_del(&req->inflight_entry); | |
1b4c351f JA |
8895 | kmem_cache_free(req_cachep, req); |
8896 | } | |
8897 | } | |
8898 | ||
4010fec4 | 8899 | static void io_req_caches_free(struct io_ring_ctx *ctx) |
2b188cc1 | 8900 | { |
cd0ca2e0 | 8901 | struct io_submit_state *state = &ctx->submit_state; |
bf019da7 | 8902 | |
9a4fdbd8 JA |
8903 | mutex_lock(&ctx->uring_lock); |
8904 | ||
cd0ca2e0 PB |
8905 | if (state->free_reqs) { |
8906 | kmem_cache_free_bulk(req_cachep, state->free_reqs, state->reqs); | |
8907 | state->free_reqs = 0; | |
8e5c66c4 | 8908 | } |
9a4fdbd8 | 8909 | |
cd0ca2e0 PB |
8910 | io_flush_cached_locked_reqs(ctx, state); |
8911 | io_req_cache_free(&state->free_list); | |
9a4fdbd8 JA |
8912 | mutex_unlock(&ctx->uring_lock); |
8913 | } | |
8914 | ||
43597aac | 8915 | static void io_wait_rsrc_data(struct io_rsrc_data *data) |
2b188cc1 | 8916 | { |
43597aac | 8917 | if (data && !atomic_dec_and_test(&data->refs)) |
bd54b6fe | 8918 | wait_for_completion(&data->done); |
bd54b6fe | 8919 | } |
04fc6c80 | 8920 | |
2b188cc1 JA |
8921 | static void io_ring_ctx_free(struct io_ring_ctx *ctx) |
8922 | { | |
37d1e2e3 | 8923 | io_sq_thread_finish(ctx); |
2aede0e4 | 8924 | |
37d1e2e3 | 8925 | if (ctx->mm_account) { |
2aede0e4 JA |
8926 | mmdrop(ctx->mm_account); |
8927 | ctx->mm_account = NULL; | |
30975825 | 8928 | } |
def596e9 | 8929 | |
43597aac PB |
8930 | /* __io_rsrc_put_work() may need uring_lock to progress, wait w/o it */ |
8931 | io_wait_rsrc_data(ctx->buf_data); | |
8932 | io_wait_rsrc_data(ctx->file_data); | |
8933 | ||
8bad28d8 | 8934 | mutex_lock(&ctx->uring_lock); |
43597aac | 8935 | if (ctx->buf_data) |
bd54b6fe | 8936 | __io_sqe_buffers_unregister(ctx); |
43597aac | 8937 | if (ctx->file_data) |
08480400 | 8938 | __io_sqe_files_unregister(ctx); |
c4ea060e PB |
8939 | if (ctx->rings) |
8940 | __io_cqring_overflow_flush(ctx, true); | |
8bad28d8 | 8941 | mutex_unlock(&ctx->uring_lock); |
9b402849 | 8942 | io_eventfd_unregister(ctx); |
5a2e745d | 8943 | io_destroy_buffers(ctx); |
07db298a PB |
8944 | if (ctx->sq_creds) |
8945 | put_cred(ctx->sq_creds); | |
def596e9 | 8946 | |
a7f0ed5a PB |
8947 | /* there are no registered resources left, nobody uses it */ |
8948 | if (ctx->rsrc_node) | |
8949 | io_rsrc_node_destroy(ctx->rsrc_node); | |
8dd03afe | 8950 | if (ctx->rsrc_backup_node) |
b895c9a6 | 8951 | io_rsrc_node_destroy(ctx->rsrc_backup_node); |
a7f0ed5a PB |
8952 | flush_delayed_work(&ctx->rsrc_put_work); |
8953 | ||
8954 | WARN_ON_ONCE(!list_empty(&ctx->rsrc_ref_list)); | |
8955 | WARN_ON_ONCE(!llist_empty(&ctx->rsrc_put_llist)); | |
def596e9 | 8956 | |
2b188cc1 | 8957 | #if defined(CONFIG_UNIX) |
355e8d26 EB |
8958 | if (ctx->ring_sock) { |
8959 | ctx->ring_sock->file = NULL; /* so that iput() is called */ | |
2b188cc1 | 8960 | sock_release(ctx->ring_sock); |
355e8d26 | 8961 | } |
2b188cc1 | 8962 | #endif |
ef9dd637 | 8963 | WARN_ON_ONCE(!list_empty(&ctx->ltimeout_list)); |
2b188cc1 | 8964 | |
75b28aff | 8965 | io_mem_free(ctx->rings); |
2b188cc1 | 8966 | io_mem_free(ctx->sq_sqes); |
2b188cc1 JA |
8967 | |
8968 | percpu_ref_exit(&ctx->refs); | |
2b188cc1 | 8969 | free_uid(ctx->user); |
4010fec4 | 8970 | io_req_caches_free(ctx); |
e941894e JA |
8971 | if (ctx->hash_map) |
8972 | io_wq_put_hash(ctx->hash_map); | |
78076bb6 | 8973 | kfree(ctx->cancel_hash); |
6224843d | 8974 | kfree(ctx->dummy_ubuf); |
2b188cc1 JA |
8975 | kfree(ctx); |
8976 | } | |
8977 | ||
8978 | static __poll_t io_uring_poll(struct file *file, poll_table *wait) | |
8979 | { | |
8980 | struct io_ring_ctx *ctx = file->private_data; | |
8981 | __poll_t mask = 0; | |
8982 | ||
311997b3 | 8983 | poll_wait(file, &ctx->poll_wait, wait); |
4f7067c3 SB |
8984 | /* |
8985 | * synchronizes with barrier from wq_has_sleeper call in | |
8986 | * io_commit_cqring | |
8987 | */ | |
2b188cc1 | 8988 | smp_rmb(); |
90554200 | 8989 | if (!io_sqring_full(ctx)) |
2b188cc1 | 8990 | mask |= EPOLLOUT | EPOLLWRNORM; |
ed670c3f HX |
8991 | |
8992 | /* | |
8993 | * Don't flush cqring overflow list here, just do a simple check. | |
8994 | * Otherwise there could possible be ABBA deadlock: | |
8995 | * CPU0 CPU1 | |
8996 | * ---- ---- | |
8997 | * lock(&ctx->uring_lock); | |
8998 | * lock(&ep->mtx); | |
8999 | * lock(&ctx->uring_lock); | |
9000 | * lock(&ep->mtx); | |
9001 | * | |
9002 | * Users may get EPOLLIN meanwhile seeing nothing in cqring, this | |
9003 | * pushs them to do the flush. | |
9004 | */ | |
5ed7a37d | 9005 | if (io_cqring_events(ctx) || test_bit(0, &ctx->check_cq_overflow)) |
2b188cc1 JA |
9006 | mask |= EPOLLIN | EPOLLRDNORM; |
9007 | ||
9008 | return mask; | |
9009 | } | |
9010 | ||
9011 | static int io_uring_fasync(int fd, struct file *file, int on) | |
9012 | { | |
9013 | struct io_ring_ctx *ctx = file->private_data; | |
9014 | ||
9015 | return fasync_helper(fd, file, on, &ctx->cq_fasync); | |
9016 | } | |
9017 | ||
0bead8cd | 9018 | static int io_unregister_personality(struct io_ring_ctx *ctx, unsigned id) |
071698e1 | 9019 | { |
4379bf8b | 9020 | const struct cred *creds; |
071698e1 | 9021 | |
61cf9370 | 9022 | creds = xa_erase(&ctx->personalities, id); |
4379bf8b JA |
9023 | if (creds) { |
9024 | put_cred(creds); | |
0bead8cd | 9025 | return 0; |
1e6fa521 | 9026 | } |
0bead8cd YD |
9027 | |
9028 | return -EINVAL; | |
9029 | } | |
9030 | ||
d56d938b PB |
9031 | struct io_tctx_exit { |
9032 | struct callback_head task_work; | |
9033 | struct completion completion; | |
baf186c4 | 9034 | struct io_ring_ctx *ctx; |
d56d938b PB |
9035 | }; |
9036 | ||
9037 | static void io_tctx_exit_cb(struct callback_head *cb) | |
9038 | { | |
9039 | struct io_uring_task *tctx = current->io_uring; | |
9040 | struct io_tctx_exit *work; | |
9041 | ||
9042 | work = container_of(cb, struct io_tctx_exit, task_work); | |
9043 | /* | |
9044 | * When @in_idle, we're in cancellation and it's racy to remove the | |
9045 | * node. It'll be removed by the end of cancellation, just ignore it. | |
9046 | */ | |
9047 | if (!atomic_read(&tctx->in_idle)) | |
eef51daa | 9048 | io_uring_del_tctx_node((unsigned long)work->ctx); |
d56d938b PB |
9049 | complete(&work->completion); |
9050 | } | |
9051 | ||
28090c13 PB |
9052 | static bool io_cancel_ctx_cb(struct io_wq_work *work, void *data) |
9053 | { | |
9054 | struct io_kiocb *req = container_of(work, struct io_kiocb, work); | |
9055 | ||
9056 | return req->ctx == data; | |
9057 | } | |
9058 | ||
85faa7b8 JA |
9059 | static void io_ring_exit_work(struct work_struct *work) |
9060 | { | |
d56d938b | 9061 | struct io_ring_ctx *ctx = container_of(work, struct io_ring_ctx, exit_work); |
b5bb3a24 | 9062 | unsigned long timeout = jiffies + HZ * 60 * 5; |
58d3be2c | 9063 | unsigned long interval = HZ / 20; |
d56d938b PB |
9064 | struct io_tctx_exit exit; |
9065 | struct io_tctx_node *node; | |
9066 | int ret; | |
85faa7b8 | 9067 | |
56952e91 JA |
9068 | /* |
9069 | * If we're doing polled IO and end up having requests being | |
9070 | * submitted async (out-of-line), then completions can come in while | |
9071 | * we're waiting for refs to drop. We need to reap these manually, | |
9072 | * as nobody else will be looking for them. | |
9073 | */ | |
b2edc0a7 | 9074 | do { |
3dd0c97a | 9075 | io_uring_try_cancel_requests(ctx, NULL, true); |
28090c13 PB |
9076 | if (ctx->sq_data) { |
9077 | struct io_sq_data *sqd = ctx->sq_data; | |
9078 | struct task_struct *tsk; | |
9079 | ||
9080 | io_sq_thread_park(sqd); | |
9081 | tsk = sqd->thread; | |
9082 | if (tsk && tsk->io_uring && tsk->io_uring->io_wq) | |
9083 | io_wq_cancel_cb(tsk->io_uring->io_wq, | |
9084 | io_cancel_ctx_cb, ctx, true); | |
9085 | io_sq_thread_unpark(sqd); | |
9086 | } | |
b5bb3a24 | 9087 | |
58d3be2c PB |
9088 | if (WARN_ON_ONCE(time_after(jiffies, timeout))) { |
9089 | /* there is little hope left, don't run it too often */ | |
9090 | interval = HZ * 60; | |
9091 | } | |
9092 | } while (!wait_for_completion_timeout(&ctx->ref_comp, interval)); | |
d56d938b | 9093 | |
7f00651a PB |
9094 | init_completion(&exit.completion); |
9095 | init_task_work(&exit.task_work, io_tctx_exit_cb); | |
9096 | exit.ctx = ctx; | |
89b5066e PB |
9097 | /* |
9098 | * Some may use context even when all refs and requests have been put, | |
9099 | * and they are free to do so while still holding uring_lock or | |
5b0a6acc | 9100 | * completion_lock, see io_req_task_submit(). Apart from other work, |
89b5066e PB |
9101 | * this lock/unlock section also waits them to finish. |
9102 | */ | |
d56d938b PB |
9103 | mutex_lock(&ctx->uring_lock); |
9104 | while (!list_empty(&ctx->tctx_list)) { | |
b5bb3a24 PB |
9105 | WARN_ON_ONCE(time_after(jiffies, timeout)); |
9106 | ||
d56d938b PB |
9107 | node = list_first_entry(&ctx->tctx_list, struct io_tctx_node, |
9108 | ctx_node); | |
7f00651a PB |
9109 | /* don't spin on a single task if cancellation failed */ |
9110 | list_rotate_left(&ctx->tctx_list); | |
d56d938b PB |
9111 | ret = task_work_add(node->task, &exit.task_work, TWA_SIGNAL); |
9112 | if (WARN_ON_ONCE(ret)) | |
9113 | continue; | |
9114 | wake_up_process(node->task); | |
9115 | ||
9116 | mutex_unlock(&ctx->uring_lock); | |
9117 | wait_for_completion(&exit.completion); | |
d56d938b PB |
9118 | mutex_lock(&ctx->uring_lock); |
9119 | } | |
9120 | mutex_unlock(&ctx->uring_lock); | |
79ebeaee JA |
9121 | spin_lock(&ctx->completion_lock); |
9122 | spin_unlock(&ctx->completion_lock); | |
d56d938b | 9123 | |
85faa7b8 JA |
9124 | io_ring_ctx_free(ctx); |
9125 | } | |
9126 | ||
80c4cbdb PB |
9127 | /* Returns true if we found and killed one or more timeouts */ |
9128 | static bool io_kill_timeouts(struct io_ring_ctx *ctx, struct task_struct *tsk, | |
3dd0c97a | 9129 | bool cancel_all) |
80c4cbdb PB |
9130 | { |
9131 | struct io_kiocb *req, *tmp; | |
9132 | int canceled = 0; | |
9133 | ||
79ebeaee JA |
9134 | spin_lock(&ctx->completion_lock); |
9135 | spin_lock_irq(&ctx->timeout_lock); | |
80c4cbdb | 9136 | list_for_each_entry_safe(req, tmp, &ctx->timeout_list, timeout.list) { |
3dd0c97a | 9137 | if (io_match_task(req, tsk, cancel_all)) { |
80c4cbdb PB |
9138 | io_kill_timeout(req, -ECANCELED); |
9139 | canceled++; | |
9140 | } | |
9141 | } | |
79ebeaee | 9142 | spin_unlock_irq(&ctx->timeout_lock); |
51520426 PB |
9143 | if (canceled != 0) |
9144 | io_commit_cqring(ctx); | |
79ebeaee | 9145 | spin_unlock(&ctx->completion_lock); |
80c4cbdb PB |
9146 | if (canceled != 0) |
9147 | io_cqring_ev_posted(ctx); | |
9148 | return canceled != 0; | |
9149 | } | |
9150 | ||
2b188cc1 JA |
9151 | static void io_ring_ctx_wait_and_kill(struct io_ring_ctx *ctx) |
9152 | { | |
61cf9370 MWO |
9153 | unsigned long index; |
9154 | struct creds *creds; | |
9155 | ||
2b188cc1 JA |
9156 | mutex_lock(&ctx->uring_lock); |
9157 | percpu_ref_kill(&ctx->refs); | |
634578f8 | 9158 | if (ctx->rings) |
6c2450ae | 9159 | __io_cqring_overflow_flush(ctx, true); |
61cf9370 MWO |
9160 | xa_for_each(&ctx->personalities, index, creds) |
9161 | io_unregister_personality(ctx, index); | |
2b188cc1 JA |
9162 | mutex_unlock(&ctx->uring_lock); |
9163 | ||
3dd0c97a PB |
9164 | io_kill_timeouts(ctx, NULL, true); |
9165 | io_poll_remove_all(ctx, NULL, true); | |
561fb04a | 9166 | |
15dff286 | 9167 | /* if we failed setting up the ctx, we might not have any rings */ |
b2edc0a7 | 9168 | io_iopoll_try_reap_events(ctx); |
309fc03a | 9169 | |
85faa7b8 | 9170 | INIT_WORK(&ctx->exit_work, io_ring_exit_work); |
fc666777 JA |
9171 | /* |
9172 | * Use system_unbound_wq to avoid spawning tons of event kworkers | |
9173 | * if we're exiting a ton of rings at the same time. It just adds | |
9174 | * noise and overhead, there's no discernable change in runtime | |
9175 | * over using system_wq. | |
9176 | */ | |
9177 | queue_work(system_unbound_wq, &ctx->exit_work); | |
2b188cc1 JA |
9178 | } |
9179 | ||
9180 | static int io_uring_release(struct inode *inode, struct file *file) | |
9181 | { | |
9182 | struct io_ring_ctx *ctx = file->private_data; | |
9183 | ||
9184 | file->private_data = NULL; | |
9185 | io_ring_ctx_wait_and_kill(ctx); | |
9186 | return 0; | |
9187 | } | |
9188 | ||
f6edbabb PB |
9189 | struct io_task_cancel { |
9190 | struct task_struct *task; | |
3dd0c97a | 9191 | bool all; |
f6edbabb | 9192 | }; |
f254ac04 | 9193 | |
f6edbabb | 9194 | static bool io_cancel_task_cb(struct io_wq_work *work, void *data) |
b711d4ea | 9195 | { |
9a472ef7 | 9196 | struct io_kiocb *req = container_of(work, struct io_kiocb, work); |
f6edbabb | 9197 | struct io_task_cancel *cancel = data; |
9a472ef7 PB |
9198 | bool ret; |
9199 | ||
3dd0c97a | 9200 | if (!cancel->all && (req->flags & REQ_F_LINK_TIMEOUT)) { |
9a472ef7 PB |
9201 | struct io_ring_ctx *ctx = req->ctx; |
9202 | ||
9203 | /* protect against races with linked timeouts */ | |
79ebeaee | 9204 | spin_lock(&ctx->completion_lock); |
3dd0c97a | 9205 | ret = io_match_task(req, cancel->task, cancel->all); |
79ebeaee | 9206 | spin_unlock(&ctx->completion_lock); |
9a472ef7 | 9207 | } else { |
3dd0c97a | 9208 | ret = io_match_task(req, cancel->task, cancel->all); |
9a472ef7 PB |
9209 | } |
9210 | return ret; | |
b711d4ea JA |
9211 | } |
9212 | ||
e1915f76 | 9213 | static bool io_cancel_defer_files(struct io_ring_ctx *ctx, |
3dd0c97a | 9214 | struct task_struct *task, bool cancel_all) |
b7ddce3c | 9215 | { |
e1915f76 | 9216 | struct io_defer_entry *de; |
b7ddce3c PB |
9217 | LIST_HEAD(list); |
9218 | ||
79ebeaee | 9219 | spin_lock(&ctx->completion_lock); |
b7ddce3c | 9220 | list_for_each_entry_reverse(de, &ctx->defer_list, list) { |
3dd0c97a | 9221 | if (io_match_task(de->req, task, cancel_all)) { |
b7ddce3c PB |
9222 | list_cut_position(&list, &ctx->defer_list, &de->list); |
9223 | break; | |
9224 | } | |
9225 | } | |
79ebeaee | 9226 | spin_unlock(&ctx->completion_lock); |
e1915f76 PB |
9227 | if (list_empty(&list)) |
9228 | return false; | |
b7ddce3c PB |
9229 | |
9230 | while (!list_empty(&list)) { | |
9231 | de = list_first_entry(&list, struct io_defer_entry, list); | |
9232 | list_del_init(&de->list); | |
f41db273 | 9233 | io_req_complete_failed(de->req, -ECANCELED); |
b7ddce3c PB |
9234 | kfree(de); |
9235 | } | |
e1915f76 | 9236 | return true; |
b7ddce3c PB |
9237 | } |
9238 | ||
1b00764f PB |
9239 | static bool io_uring_try_cancel_iowq(struct io_ring_ctx *ctx) |
9240 | { | |
9241 | struct io_tctx_node *node; | |
9242 | enum io_wq_cancel cret; | |
9243 | bool ret = false; | |
9244 | ||
9245 | mutex_lock(&ctx->uring_lock); | |
9246 | list_for_each_entry(node, &ctx->tctx_list, ctx_node) { | |
9247 | struct io_uring_task *tctx = node->task->io_uring; | |
9248 | ||
9249 | /* | |
9250 | * io_wq will stay alive while we hold uring_lock, because it's | |
9251 | * killed after ctx nodes, which requires to take the lock. | |
9252 | */ | |
9253 | if (!tctx || !tctx->io_wq) | |
9254 | continue; | |
9255 | cret = io_wq_cancel_cb(tctx->io_wq, io_cancel_ctx_cb, ctx, true); | |
9256 | ret |= (cret != IO_WQ_CANCEL_NOTFOUND); | |
9257 | } | |
9258 | mutex_unlock(&ctx->uring_lock); | |
9259 | ||
9260 | return ret; | |
9261 | } | |
9262 | ||
9936c7c2 PB |
9263 | static void io_uring_try_cancel_requests(struct io_ring_ctx *ctx, |
9264 | struct task_struct *task, | |
3dd0c97a | 9265 | bool cancel_all) |
9936c7c2 | 9266 | { |
3dd0c97a | 9267 | struct io_task_cancel cancel = { .task = task, .all = cancel_all, }; |
1b00764f | 9268 | struct io_uring_task *tctx = task ? task->io_uring : NULL; |
9936c7c2 PB |
9269 | |
9270 | while (1) { | |
9271 | enum io_wq_cancel cret; | |
9272 | bool ret = false; | |
9273 | ||
1b00764f PB |
9274 | if (!task) { |
9275 | ret |= io_uring_try_cancel_iowq(ctx); | |
9276 | } else if (tctx && tctx->io_wq) { | |
9277 | /* | |
9278 | * Cancels requests of all rings, not only @ctx, but | |
9279 | * it's fine as the task is in exit/exec. | |
9280 | */ | |
5aa75ed5 | 9281 | cret = io_wq_cancel_cb(tctx->io_wq, io_cancel_task_cb, |
9936c7c2 PB |
9282 | &cancel, true); |
9283 | ret |= (cret != IO_WQ_CANCEL_NOTFOUND); | |
9284 | } | |
9285 | ||
9286 | /* SQPOLL thread does its own polling */ | |
3dd0c97a | 9287 | if ((!(ctx->flags & IORING_SETUP_SQPOLL) && cancel_all) || |
d052d1d6 | 9288 | (ctx->sq_data && ctx->sq_data->thread == current)) { |
9936c7c2 PB |
9289 | while (!list_empty_careful(&ctx->iopoll_list)) { |
9290 | io_iopoll_try_reap_events(ctx); | |
9291 | ret = true; | |
9292 | } | |
9293 | } | |
9294 | ||
3dd0c97a PB |
9295 | ret |= io_cancel_defer_files(ctx, task, cancel_all); |
9296 | ret |= io_poll_remove_all(ctx, task, cancel_all); | |
9297 | ret |= io_kill_timeouts(ctx, task, cancel_all); | |
e5dc480d PB |
9298 | if (task) |
9299 | ret |= io_run_task_work(); | |
9936c7c2 PB |
9300 | if (!ret) |
9301 | break; | |
9302 | cond_resched(); | |
9303 | } | |
9304 | } | |
9305 | ||
eef51daa | 9306 | static int __io_uring_add_tctx_node(struct io_ring_ctx *ctx) |
0f212204 | 9307 | { |
236434c3 | 9308 | struct io_uring_task *tctx = current->io_uring; |
13bf43f5 | 9309 | struct io_tctx_node *node; |
a528b04e | 9310 | int ret; |
236434c3 MWO |
9311 | |
9312 | if (unlikely(!tctx)) { | |
5aa75ed5 | 9313 | ret = io_uring_alloc_task_context(current, ctx); |
0f212204 JA |
9314 | if (unlikely(ret)) |
9315 | return ret; | |
236434c3 | 9316 | tctx = current->io_uring; |
0f212204 | 9317 | } |
cf27f3b1 PB |
9318 | if (!xa_load(&tctx->xa, (unsigned long)ctx)) { |
9319 | node = kmalloc(sizeof(*node), GFP_KERNEL); | |
9320 | if (!node) | |
9321 | return -ENOMEM; | |
9322 | node->ctx = ctx; | |
9323 | node->task = current; | |
13bf43f5 | 9324 | |
cf27f3b1 PB |
9325 | ret = xa_err(xa_store(&tctx->xa, (unsigned long)ctx, |
9326 | node, GFP_KERNEL)); | |
9327 | if (ret) { | |
9328 | kfree(node); | |
9329 | return ret; | |
0f212204 | 9330 | } |
cf27f3b1 PB |
9331 | |
9332 | mutex_lock(&ctx->uring_lock); | |
9333 | list_add(&node->ctx_node, &ctx->tctx_list); | |
9334 | mutex_unlock(&ctx->uring_lock); | |
0f212204 | 9335 | } |
cf27f3b1 | 9336 | tctx->last = ctx; |
0f212204 JA |
9337 | return 0; |
9338 | } | |
9339 | ||
cf27f3b1 PB |
9340 | /* |
9341 | * Note that this task has used io_uring. We use it for cancelation purposes. | |
9342 | */ | |
eef51daa | 9343 | static inline int io_uring_add_tctx_node(struct io_ring_ctx *ctx) |
cf27f3b1 PB |
9344 | { |
9345 | struct io_uring_task *tctx = current->io_uring; | |
9346 | ||
9347 | if (likely(tctx && tctx->last == ctx)) | |
9348 | return 0; | |
eef51daa | 9349 | return __io_uring_add_tctx_node(ctx); |
cf27f3b1 PB |
9350 | } |
9351 | ||
0f212204 JA |
9352 | /* |
9353 | * Remove this io_uring_file -> task mapping. | |
9354 | */ | |
eef51daa | 9355 | static void io_uring_del_tctx_node(unsigned long index) |
0f212204 JA |
9356 | { |
9357 | struct io_uring_task *tctx = current->io_uring; | |
13bf43f5 | 9358 | struct io_tctx_node *node; |
2941267b | 9359 | |
eebd2e37 PB |
9360 | if (!tctx) |
9361 | return; | |
13bf43f5 PB |
9362 | node = xa_erase(&tctx->xa, index); |
9363 | if (!node) | |
2941267b | 9364 | return; |
0f212204 | 9365 | |
13bf43f5 PB |
9366 | WARN_ON_ONCE(current != node->task); |
9367 | WARN_ON_ONCE(list_empty(&node->ctx_node)); | |
9368 | ||
9369 | mutex_lock(&node->ctx->uring_lock); | |
9370 | list_del(&node->ctx_node); | |
9371 | mutex_unlock(&node->ctx->uring_lock); | |
9372 | ||
baf186c4 | 9373 | if (tctx->last == node->ctx) |
0f212204 | 9374 | tctx->last = NULL; |
13bf43f5 | 9375 | kfree(node); |
0f212204 JA |
9376 | } |
9377 | ||
8452d4a6 | 9378 | static void io_uring_clean_tctx(struct io_uring_task *tctx) |
de7f1d9e | 9379 | { |
ba5ef6dc | 9380 | struct io_wq *wq = tctx->io_wq; |
13bf43f5 | 9381 | struct io_tctx_node *node; |
de7f1d9e PB |
9382 | unsigned long index; |
9383 | ||
13bf43f5 | 9384 | xa_for_each(&tctx->xa, index, node) |
eef51daa | 9385 | io_uring_del_tctx_node(index); |
b16ef427 ME |
9386 | if (wq) { |
9387 | /* | |
9388 | * Must be after io_uring_del_task_file() (removes nodes under | |
9389 | * uring_lock) to avoid race with io_uring_try_cancel_iowq(). | |
9390 | */ | |
ba5ef6dc | 9391 | io_wq_put_and_exit(wq); |
dadebc35 | 9392 | tctx->io_wq = NULL; |
b16ef427 | 9393 | } |
de7f1d9e PB |
9394 | } |
9395 | ||
3f48cf18 | 9396 | static s64 tctx_inflight(struct io_uring_task *tctx, bool tracked) |
521d6a73 | 9397 | { |
3f48cf18 PB |
9398 | if (tracked) |
9399 | return atomic_read(&tctx->inflight_tracked); | |
521d6a73 PB |
9400 | return percpu_counter_sum(&tctx->inflight); |
9401 | } | |
9402 | ||
09899b19 PB |
9403 | static void io_uring_drop_tctx_refs(struct task_struct *task) |
9404 | { | |
9405 | struct io_uring_task *tctx = task->io_uring; | |
9406 | unsigned int refs = tctx->cached_refs; | |
9407 | ||
e9dbe221 PB |
9408 | if (refs) { |
9409 | tctx->cached_refs = 0; | |
9410 | percpu_counter_sub(&tctx->inflight, refs); | |
9411 | put_task_struct_many(task, refs); | |
9412 | } | |
09899b19 PB |
9413 | } |
9414 | ||
78cc687b PB |
9415 | /* |
9416 | * Find any io_uring ctx that this task has registered or done IO on, and cancel | |
9417 | * requests. @sqd should be not-null IIF it's an SQPOLL thread cancellation. | |
9418 | */ | |
9419 | static void io_uring_cancel_generic(bool cancel_all, struct io_sq_data *sqd) | |
0e9ddb39 | 9420 | { |
521d6a73 | 9421 | struct io_uring_task *tctx = current->io_uring; |
734551df | 9422 | struct io_ring_ctx *ctx; |
0e9ddb39 PB |
9423 | s64 inflight; |
9424 | DEFINE_WAIT(wait); | |
fdaf083c | 9425 | |
78cc687b PB |
9426 | WARN_ON_ONCE(sqd && sqd->thread != current); |
9427 | ||
6d042ffb PO |
9428 | if (!current->io_uring) |
9429 | return; | |
17a91051 PB |
9430 | if (tctx->io_wq) |
9431 | io_wq_exit_start(tctx->io_wq); | |
9432 | ||
0e9ddb39 PB |
9433 | atomic_inc(&tctx->in_idle); |
9434 | do { | |
e9dbe221 | 9435 | io_uring_drop_tctx_refs(current); |
0e9ddb39 | 9436 | /* read completions before cancelations */ |
78cc687b | 9437 | inflight = tctx_inflight(tctx, !cancel_all); |
0e9ddb39 PB |
9438 | if (!inflight) |
9439 | break; | |
fdaf083c | 9440 | |
78cc687b PB |
9441 | if (!sqd) { |
9442 | struct io_tctx_node *node; | |
9443 | unsigned long index; | |
0f212204 | 9444 | |
78cc687b PB |
9445 | xa_for_each(&tctx->xa, index, node) { |
9446 | /* sqpoll task will cancel all its requests */ | |
9447 | if (node->ctx->sq_data) | |
9448 | continue; | |
9449 | io_uring_try_cancel_requests(node->ctx, current, | |
9450 | cancel_all); | |
9451 | } | |
9452 | } else { | |
9453 | list_for_each_entry(ctx, &sqd->ctx_list, sqd_list) | |
9454 | io_uring_try_cancel_requests(ctx, current, | |
9455 | cancel_all); | |
9456 | } | |
17a91051 | 9457 | |
0f212204 | 9458 | prepare_to_wait(&tctx->wait, &wait, TASK_UNINTERRUPTIBLE); |
e9dbe221 | 9459 | io_uring_drop_tctx_refs(current); |
0f212204 | 9460 | /* |
a1bb3cd5 PB |
9461 | * If we've seen completions, retry without waiting. This |
9462 | * avoids a race where a completion comes in before we did | |
9463 | * prepare_to_wait(). | |
0f212204 | 9464 | */ |
3dd0c97a | 9465 | if (inflight == tctx_inflight(tctx, !cancel_all)) |
a1bb3cd5 | 9466 | schedule(); |
f57555ed | 9467 | finish_wait(&tctx->wait, &wait); |
d8a6df10 | 9468 | } while (1); |
fdaf083c | 9469 | atomic_dec(&tctx->in_idle); |
de7f1d9e | 9470 | |
8452d4a6 | 9471 | io_uring_clean_tctx(tctx); |
3dd0c97a | 9472 | if (cancel_all) { |
3f48cf18 PB |
9473 | /* for exec all current's requests should be gone, kill tctx */ |
9474 | __io_uring_free(current); | |
9475 | } | |
44e728b8 PB |
9476 | } |
9477 | ||
f552a27a | 9478 | void __io_uring_cancel(bool cancel_all) |
78cc687b | 9479 | { |
f552a27a | 9480 | io_uring_cancel_generic(cancel_all, NULL); |
78cc687b PB |
9481 | } |
9482 | ||
6c5c240e RP |
9483 | static void *io_uring_validate_mmap_request(struct file *file, |
9484 | loff_t pgoff, size_t sz) | |
2b188cc1 | 9485 | { |
2b188cc1 | 9486 | struct io_ring_ctx *ctx = file->private_data; |
6c5c240e | 9487 | loff_t offset = pgoff << PAGE_SHIFT; |
2b188cc1 JA |
9488 | struct page *page; |
9489 | void *ptr; | |
9490 | ||
9491 | switch (offset) { | |
9492 | case IORING_OFF_SQ_RING: | |
75b28aff HV |
9493 | case IORING_OFF_CQ_RING: |
9494 | ptr = ctx->rings; | |
2b188cc1 JA |
9495 | break; |
9496 | case IORING_OFF_SQES: | |
9497 | ptr = ctx->sq_sqes; | |
9498 | break; | |
2b188cc1 | 9499 | default: |
6c5c240e | 9500 | return ERR_PTR(-EINVAL); |
2b188cc1 JA |
9501 | } |
9502 | ||
9503 | page = virt_to_head_page(ptr); | |
a50b854e | 9504 | if (sz > page_size(page)) |
6c5c240e RP |
9505 | return ERR_PTR(-EINVAL); |
9506 | ||
9507 | return ptr; | |
9508 | } | |
9509 | ||
9510 | #ifdef CONFIG_MMU | |
9511 | ||
9512 | static int io_uring_mmap(struct file *file, struct vm_area_struct *vma) | |
9513 | { | |
9514 | size_t sz = vma->vm_end - vma->vm_start; | |
9515 | unsigned long pfn; | |
9516 | void *ptr; | |
9517 | ||
9518 | ptr = io_uring_validate_mmap_request(file, vma->vm_pgoff, sz); | |
9519 | if (IS_ERR(ptr)) | |
9520 | return PTR_ERR(ptr); | |
2b188cc1 JA |
9521 | |
9522 | pfn = virt_to_phys(ptr) >> PAGE_SHIFT; | |
9523 | return remap_pfn_range(vma, vma->vm_start, pfn, sz, vma->vm_page_prot); | |
9524 | } | |
9525 | ||
6c5c240e RP |
9526 | #else /* !CONFIG_MMU */ |
9527 | ||
9528 | static int io_uring_mmap(struct file *file, struct vm_area_struct *vma) | |
9529 | { | |
9530 | return vma->vm_flags & (VM_SHARED | VM_MAYSHARE) ? 0 : -EINVAL; | |
9531 | } | |
9532 | ||
9533 | static unsigned int io_uring_nommu_mmap_capabilities(struct file *file) | |
9534 | { | |
9535 | return NOMMU_MAP_DIRECT | NOMMU_MAP_READ | NOMMU_MAP_WRITE; | |
9536 | } | |
9537 | ||
9538 | static unsigned long io_uring_nommu_get_unmapped_area(struct file *file, | |
9539 | unsigned long addr, unsigned long len, | |
9540 | unsigned long pgoff, unsigned long flags) | |
9541 | { | |
9542 | void *ptr; | |
9543 | ||
9544 | ptr = io_uring_validate_mmap_request(file, pgoff, len); | |
9545 | if (IS_ERR(ptr)) | |
9546 | return PTR_ERR(ptr); | |
9547 | ||
9548 | return (unsigned long) ptr; | |
9549 | } | |
9550 | ||
9551 | #endif /* !CONFIG_MMU */ | |
9552 | ||
d9d05217 | 9553 | static int io_sqpoll_wait_sq(struct io_ring_ctx *ctx) |
90554200 JA |
9554 | { |
9555 | DEFINE_WAIT(wait); | |
9556 | ||
9557 | do { | |
9558 | if (!io_sqring_full(ctx)) | |
9559 | break; | |
90554200 JA |
9560 | prepare_to_wait(&ctx->sqo_sq_wait, &wait, TASK_INTERRUPTIBLE); |
9561 | ||
9562 | if (!io_sqring_full(ctx)) | |
9563 | break; | |
90554200 JA |
9564 | schedule(); |
9565 | } while (!signal_pending(current)); | |
9566 | ||
9567 | finish_wait(&ctx->sqo_sq_wait, &wait); | |
5199328a | 9568 | return 0; |
90554200 JA |
9569 | } |
9570 | ||
c73ebb68 HX |
9571 | static int io_get_ext_arg(unsigned flags, const void __user *argp, size_t *argsz, |
9572 | struct __kernel_timespec __user **ts, | |
9573 | const sigset_t __user **sig) | |
9574 | { | |
9575 | struct io_uring_getevents_arg arg; | |
9576 | ||
9577 | /* | |
9578 | * If EXT_ARG isn't set, then we have no timespec and the argp pointer | |
9579 | * is just a pointer to the sigset_t. | |
9580 | */ | |
9581 | if (!(flags & IORING_ENTER_EXT_ARG)) { | |
9582 | *sig = (const sigset_t __user *) argp; | |
9583 | *ts = NULL; | |
9584 | return 0; | |
9585 | } | |
9586 | ||
9587 | /* | |
9588 | * EXT_ARG is set - ensure we agree on the size of it and copy in our | |
9589 | * timespec and sigset_t pointers if good. | |
9590 | */ | |
9591 | if (*argsz != sizeof(arg)) | |
9592 | return -EINVAL; | |
9593 | if (copy_from_user(&arg, argp, sizeof(arg))) | |
9594 | return -EFAULT; | |
9595 | *sig = u64_to_user_ptr(arg.sigmask); | |
9596 | *argsz = arg.sigmask_sz; | |
9597 | *ts = u64_to_user_ptr(arg.ts); | |
9598 | return 0; | |
9599 | } | |
9600 | ||
2b188cc1 | 9601 | SYSCALL_DEFINE6(io_uring_enter, unsigned int, fd, u32, to_submit, |
c73ebb68 HX |
9602 | u32, min_complete, u32, flags, const void __user *, argp, |
9603 | size_t, argsz) | |
2b188cc1 JA |
9604 | { |
9605 | struct io_ring_ctx *ctx; | |
2b188cc1 JA |
9606 | int submitted = 0; |
9607 | struct fd f; | |
33f993da | 9608 | long ret; |
2b188cc1 | 9609 | |
4c6e277c | 9610 | io_run_task_work(); |
b41e9852 | 9611 | |
33f993da PB |
9612 | if (unlikely(flags & ~(IORING_ENTER_GETEVENTS | IORING_ENTER_SQ_WAKEUP | |
9613 | IORING_ENTER_SQ_WAIT | IORING_ENTER_EXT_ARG))) | |
2b188cc1 JA |
9614 | return -EINVAL; |
9615 | ||
9616 | f = fdget(fd); | |
33f993da | 9617 | if (unlikely(!f.file)) |
2b188cc1 JA |
9618 | return -EBADF; |
9619 | ||
9620 | ret = -EOPNOTSUPP; | |
33f993da | 9621 | if (unlikely(f.file->f_op != &io_uring_fops)) |
2b188cc1 JA |
9622 | goto out_fput; |
9623 | ||
9624 | ret = -ENXIO; | |
9625 | ctx = f.file->private_data; | |
33f993da | 9626 | if (unlikely(!percpu_ref_tryget(&ctx->refs))) |
2b188cc1 JA |
9627 | goto out_fput; |
9628 | ||
7e84e1c7 | 9629 | ret = -EBADFD; |
33f993da | 9630 | if (unlikely(ctx->flags & IORING_SETUP_R_DISABLED)) |
7e84e1c7 SG |
9631 | goto out; |
9632 | ||
6c271ce2 JA |
9633 | /* |
9634 | * For SQ polling, the thread will do all submissions and completions. | |
9635 | * Just return the requested submit count, and wake the thread if | |
9636 | * we were asked to. | |
9637 | */ | |
b2a9eada | 9638 | ret = 0; |
6c271ce2 | 9639 | if (ctx->flags & IORING_SETUP_SQPOLL) { |
90f67366 | 9640 | io_cqring_overflow_flush(ctx); |
89448c47 | 9641 | |
21f96522 JA |
9642 | if (unlikely(ctx->sq_data->thread == NULL)) { |
9643 | ret = -EOWNERDEAD; | |
04147488 | 9644 | goto out; |
21f96522 | 9645 | } |
6c271ce2 | 9646 | if (flags & IORING_ENTER_SQ_WAKEUP) |
534ca6d6 | 9647 | wake_up(&ctx->sq_data->wait); |
d9d05217 PB |
9648 | if (flags & IORING_ENTER_SQ_WAIT) { |
9649 | ret = io_sqpoll_wait_sq(ctx); | |
9650 | if (ret) | |
9651 | goto out; | |
9652 | } | |
6c271ce2 | 9653 | submitted = to_submit; |
b2a9eada | 9654 | } else if (to_submit) { |
eef51daa | 9655 | ret = io_uring_add_tctx_node(ctx); |
0f212204 JA |
9656 | if (unlikely(ret)) |
9657 | goto out; | |
2b188cc1 | 9658 | mutex_lock(&ctx->uring_lock); |
0f212204 | 9659 | submitted = io_submit_sqes(ctx, to_submit); |
2b188cc1 | 9660 | mutex_unlock(&ctx->uring_lock); |
7c504e65 PB |
9661 | |
9662 | if (submitted != to_submit) | |
9663 | goto out; | |
2b188cc1 JA |
9664 | } |
9665 | if (flags & IORING_ENTER_GETEVENTS) { | |
c73ebb68 HX |
9666 | const sigset_t __user *sig; |
9667 | struct __kernel_timespec __user *ts; | |
9668 | ||
9669 | ret = io_get_ext_arg(flags, argp, &argsz, &ts, &sig); | |
9670 | if (unlikely(ret)) | |
9671 | goto out; | |
9672 | ||
2b188cc1 JA |
9673 | min_complete = min(min_complete, ctx->cq_entries); |
9674 | ||
32b2244a XW |
9675 | /* |
9676 | * When SETUP_IOPOLL and SETUP_SQPOLL are both enabled, user | |
9677 | * space applications don't need to do io completion events | |
9678 | * polling again, they can rely on io_sq_thread to do polling | |
9679 | * work, which can reduce cpu usage and uring_lock contention. | |
9680 | */ | |
9681 | if (ctx->flags & IORING_SETUP_IOPOLL && | |
9682 | !(ctx->flags & IORING_SETUP_SQPOLL)) { | |
7668b92a | 9683 | ret = io_iopoll_check(ctx, min_complete); |
def596e9 | 9684 | } else { |
c73ebb68 | 9685 | ret = io_cqring_wait(ctx, min_complete, sig, argsz, ts); |
def596e9 | 9686 | } |
2b188cc1 JA |
9687 | } |
9688 | ||
7c504e65 | 9689 | out: |
6805b32e | 9690 | percpu_ref_put(&ctx->refs); |
2b188cc1 JA |
9691 | out_fput: |
9692 | fdput(f); | |
9693 | return submitted ? submitted : ret; | |
9694 | } | |
9695 | ||
bebdb65e | 9696 | #ifdef CONFIG_PROC_FS |
61cf9370 MWO |
9697 | static int io_uring_show_cred(struct seq_file *m, unsigned int id, |
9698 | const struct cred *cred) | |
87ce955b | 9699 | { |
87ce955b JA |
9700 | struct user_namespace *uns = seq_user_ns(m); |
9701 | struct group_info *gi; | |
9702 | kernel_cap_t cap; | |
9703 | unsigned __capi; | |
9704 | int g; | |
9705 | ||
9706 | seq_printf(m, "%5d\n", id); | |
9707 | seq_put_decimal_ull(m, "\tUid:\t", from_kuid_munged(uns, cred->uid)); | |
9708 | seq_put_decimal_ull(m, "\t\t", from_kuid_munged(uns, cred->euid)); | |
9709 | seq_put_decimal_ull(m, "\t\t", from_kuid_munged(uns, cred->suid)); | |
9710 | seq_put_decimal_ull(m, "\t\t", from_kuid_munged(uns, cred->fsuid)); | |
9711 | seq_put_decimal_ull(m, "\n\tGid:\t", from_kgid_munged(uns, cred->gid)); | |
9712 | seq_put_decimal_ull(m, "\t\t", from_kgid_munged(uns, cred->egid)); | |
9713 | seq_put_decimal_ull(m, "\t\t", from_kgid_munged(uns, cred->sgid)); | |
9714 | seq_put_decimal_ull(m, "\t\t", from_kgid_munged(uns, cred->fsgid)); | |
9715 | seq_puts(m, "\n\tGroups:\t"); | |
9716 | gi = cred->group_info; | |
9717 | for (g = 0; g < gi->ngroups; g++) { | |
9718 | seq_put_decimal_ull(m, g ? " " : "", | |
9719 | from_kgid_munged(uns, gi->gid[g])); | |
9720 | } | |
9721 | seq_puts(m, "\n\tCapEff:\t"); | |
9722 | cap = cred->cap_effective; | |
9723 | CAP_FOR_EACH_U32(__capi) | |
9724 | seq_put_hex_ll(m, NULL, cap.cap[CAP_LAST_U32 - __capi], 8); | |
9725 | seq_putc(m, '\n'); | |
9726 | return 0; | |
9727 | } | |
9728 | ||
9729 | static void __io_uring_show_fdinfo(struct io_ring_ctx *ctx, struct seq_file *m) | |
9730 | { | |
dbbe9c64 | 9731 | struct io_sq_data *sq = NULL; |
fad8e0de | 9732 | bool has_lock; |
87ce955b JA |
9733 | int i; |
9734 | ||
fad8e0de JA |
9735 | /* |
9736 | * Avoid ABBA deadlock between the seq lock and the io_uring mutex, | |
9737 | * since fdinfo case grabs it in the opposite direction of normal use | |
9738 | * cases. If we fail to get the lock, we just don't iterate any | |
9739 | * structures that could be going away outside the io_uring mutex. | |
9740 | */ | |
9741 | has_lock = mutex_trylock(&ctx->uring_lock); | |
9742 | ||
5f3f26f9 | 9743 | if (has_lock && (ctx->flags & IORING_SETUP_SQPOLL)) { |
dbbe9c64 | 9744 | sq = ctx->sq_data; |
5f3f26f9 JA |
9745 | if (!sq->thread) |
9746 | sq = NULL; | |
9747 | } | |
dbbe9c64 JQ |
9748 | |
9749 | seq_printf(m, "SqThread:\t%d\n", sq ? task_pid_nr(sq->thread) : -1); | |
9750 | seq_printf(m, "SqThreadCpu:\t%d\n", sq ? task_cpu(sq->thread) : -1); | |
87ce955b | 9751 | seq_printf(m, "UserFiles:\t%u\n", ctx->nr_user_files); |
fad8e0de | 9752 | for (i = 0; has_lock && i < ctx->nr_user_files; i++) { |
7b29f92d | 9753 | struct file *f = io_file_from_index(ctx, i); |
87ce955b | 9754 | |
87ce955b JA |
9755 | if (f) |
9756 | seq_printf(m, "%5u: %s\n", i, file_dentry(f)->d_iname); | |
9757 | else | |
9758 | seq_printf(m, "%5u: <none>\n", i); | |
9759 | } | |
9760 | seq_printf(m, "UserBufs:\t%u\n", ctx->nr_user_bufs); | |
fad8e0de | 9761 | for (i = 0; has_lock && i < ctx->nr_user_bufs; i++) { |
41edf1a5 | 9762 | struct io_mapped_ubuf *buf = ctx->user_bufs[i]; |
4751f53d | 9763 | unsigned int len = buf->ubuf_end - buf->ubuf; |
87ce955b | 9764 | |
4751f53d | 9765 | seq_printf(m, "%5u: 0x%llx/%u\n", i, buf->ubuf, len); |
87ce955b | 9766 | } |
61cf9370 MWO |
9767 | if (has_lock && !xa_empty(&ctx->personalities)) { |
9768 | unsigned long index; | |
9769 | const struct cred *cred; | |
9770 | ||
87ce955b | 9771 | seq_printf(m, "Personalities:\n"); |
61cf9370 MWO |
9772 | xa_for_each(&ctx->personalities, index, cred) |
9773 | io_uring_show_cred(m, index, cred); | |
87ce955b | 9774 | } |
d7718a9d | 9775 | seq_printf(m, "PollList:\n"); |
79ebeaee | 9776 | spin_lock(&ctx->completion_lock); |
d7718a9d JA |
9777 | for (i = 0; i < (1U << ctx->cancel_hash_bits); i++) { |
9778 | struct hlist_head *list = &ctx->cancel_hash[i]; | |
9779 | struct io_kiocb *req; | |
9780 | ||
9781 | hlist_for_each_entry(req, list, hash_node) | |
9782 | seq_printf(m, " op=%d, task_works=%d\n", req->opcode, | |
9783 | req->task->task_works != NULL); | |
9784 | } | |
79ebeaee | 9785 | spin_unlock(&ctx->completion_lock); |
fad8e0de JA |
9786 | if (has_lock) |
9787 | mutex_unlock(&ctx->uring_lock); | |
87ce955b JA |
9788 | } |
9789 | ||
9790 | static void io_uring_show_fdinfo(struct seq_file *m, struct file *f) | |
9791 | { | |
9792 | struct io_ring_ctx *ctx = f->private_data; | |
9793 | ||
9794 | if (percpu_ref_tryget(&ctx->refs)) { | |
9795 | __io_uring_show_fdinfo(ctx, m); | |
9796 | percpu_ref_put(&ctx->refs); | |
9797 | } | |
9798 | } | |
bebdb65e | 9799 | #endif |
87ce955b | 9800 | |
2b188cc1 JA |
9801 | static const struct file_operations io_uring_fops = { |
9802 | .release = io_uring_release, | |
9803 | .mmap = io_uring_mmap, | |
6c5c240e RP |
9804 | #ifndef CONFIG_MMU |
9805 | .get_unmapped_area = io_uring_nommu_get_unmapped_area, | |
9806 | .mmap_capabilities = io_uring_nommu_mmap_capabilities, | |
9807 | #endif | |
2b188cc1 JA |
9808 | .poll = io_uring_poll, |
9809 | .fasync = io_uring_fasync, | |
bebdb65e | 9810 | #ifdef CONFIG_PROC_FS |
87ce955b | 9811 | .show_fdinfo = io_uring_show_fdinfo, |
bebdb65e | 9812 | #endif |
2b188cc1 JA |
9813 | }; |
9814 | ||
9815 | static int io_allocate_scq_urings(struct io_ring_ctx *ctx, | |
9816 | struct io_uring_params *p) | |
9817 | { | |
75b28aff HV |
9818 | struct io_rings *rings; |
9819 | size_t size, sq_array_offset; | |
2b188cc1 | 9820 | |
bd740481 JA |
9821 | /* make sure these are sane, as we already accounted them */ |
9822 | ctx->sq_entries = p->sq_entries; | |
9823 | ctx->cq_entries = p->cq_entries; | |
9824 | ||
75b28aff HV |
9825 | size = rings_size(p->sq_entries, p->cq_entries, &sq_array_offset); |
9826 | if (size == SIZE_MAX) | |
9827 | return -EOVERFLOW; | |
9828 | ||
9829 | rings = io_mem_alloc(size); | |
9830 | if (!rings) | |
2b188cc1 JA |
9831 | return -ENOMEM; |
9832 | ||
75b28aff HV |
9833 | ctx->rings = rings; |
9834 | ctx->sq_array = (u32 *)((char *)rings + sq_array_offset); | |
9835 | rings->sq_ring_mask = p->sq_entries - 1; | |
9836 | rings->cq_ring_mask = p->cq_entries - 1; | |
9837 | rings->sq_ring_entries = p->sq_entries; | |
9838 | rings->cq_ring_entries = p->cq_entries; | |
2b188cc1 JA |
9839 | |
9840 | size = array_size(sizeof(struct io_uring_sqe), p->sq_entries); | |
eb065d30 JA |
9841 | if (size == SIZE_MAX) { |
9842 | io_mem_free(ctx->rings); | |
9843 | ctx->rings = NULL; | |
2b188cc1 | 9844 | return -EOVERFLOW; |
eb065d30 | 9845 | } |
2b188cc1 JA |
9846 | |
9847 | ctx->sq_sqes = io_mem_alloc(size); | |
eb065d30 JA |
9848 | if (!ctx->sq_sqes) { |
9849 | io_mem_free(ctx->rings); | |
9850 | ctx->rings = NULL; | |
2b188cc1 | 9851 | return -ENOMEM; |
eb065d30 | 9852 | } |
2b188cc1 | 9853 | |
2b188cc1 JA |
9854 | return 0; |
9855 | } | |
9856 | ||
9faadcc8 PB |
9857 | static int io_uring_install_fd(struct io_ring_ctx *ctx, struct file *file) |
9858 | { | |
9859 | int ret, fd; | |
9860 | ||
9861 | fd = get_unused_fd_flags(O_RDWR | O_CLOEXEC); | |
9862 | if (fd < 0) | |
9863 | return fd; | |
9864 | ||
eef51daa | 9865 | ret = io_uring_add_tctx_node(ctx); |
9faadcc8 PB |
9866 | if (ret) { |
9867 | put_unused_fd(fd); | |
9868 | return ret; | |
9869 | } | |
9870 | fd_install(fd, file); | |
9871 | return fd; | |
9872 | } | |
9873 | ||
2b188cc1 JA |
9874 | /* |
9875 | * Allocate an anonymous fd, this is what constitutes the application | |
9876 | * visible backing of an io_uring instance. The application mmaps this | |
9877 | * fd to gain access to the SQ/CQ ring details. If UNIX sockets are enabled, | |
9878 | * we have to tie this fd to a socket for file garbage collection purposes. | |
9879 | */ | |
9faadcc8 | 9880 | static struct file *io_uring_get_file(struct io_ring_ctx *ctx) |
2b188cc1 JA |
9881 | { |
9882 | struct file *file; | |
9faadcc8 | 9883 | #if defined(CONFIG_UNIX) |
2b188cc1 JA |
9884 | int ret; |
9885 | ||
2b188cc1 JA |
9886 | ret = sock_create_kern(&init_net, PF_UNIX, SOCK_RAW, IPPROTO_IP, |
9887 | &ctx->ring_sock); | |
9888 | if (ret) | |
9faadcc8 | 9889 | return ERR_PTR(ret); |
2b188cc1 JA |
9890 | #endif |
9891 | ||
2b188cc1 JA |
9892 | file = anon_inode_getfile("[io_uring]", &io_uring_fops, ctx, |
9893 | O_RDWR | O_CLOEXEC); | |
2b188cc1 | 9894 | #if defined(CONFIG_UNIX) |
9faadcc8 PB |
9895 | if (IS_ERR(file)) { |
9896 | sock_release(ctx->ring_sock); | |
9897 | ctx->ring_sock = NULL; | |
9898 | } else { | |
9899 | ctx->ring_sock->file = file; | |
0f212204 | 9900 | } |
2b188cc1 | 9901 | #endif |
9faadcc8 | 9902 | return file; |
2b188cc1 JA |
9903 | } |
9904 | ||
7f13657d XW |
9905 | static int io_uring_create(unsigned entries, struct io_uring_params *p, |
9906 | struct io_uring_params __user *params) | |
2b188cc1 | 9907 | { |
2b188cc1 | 9908 | struct io_ring_ctx *ctx; |
9faadcc8 | 9909 | struct file *file; |
2b188cc1 JA |
9910 | int ret; |
9911 | ||
8110c1a6 | 9912 | if (!entries) |
2b188cc1 | 9913 | return -EINVAL; |
8110c1a6 JA |
9914 | if (entries > IORING_MAX_ENTRIES) { |
9915 | if (!(p->flags & IORING_SETUP_CLAMP)) | |
9916 | return -EINVAL; | |
9917 | entries = IORING_MAX_ENTRIES; | |
9918 | } | |
2b188cc1 JA |
9919 | |
9920 | /* | |
9921 | * Use twice as many entries for the CQ ring. It's possible for the | |
9922 | * application to drive a higher depth than the size of the SQ ring, | |
9923 | * since the sqes are only used at submission time. This allows for | |
33a107f0 JA |
9924 | * some flexibility in overcommitting a bit. If the application has |
9925 | * set IORING_SETUP_CQSIZE, it will have passed in the desired number | |
9926 | * of CQ ring entries manually. | |
2b188cc1 JA |
9927 | */ |
9928 | p->sq_entries = roundup_pow_of_two(entries); | |
33a107f0 JA |
9929 | if (p->flags & IORING_SETUP_CQSIZE) { |
9930 | /* | |
9931 | * If IORING_SETUP_CQSIZE is set, we do the same roundup | |
9932 | * to a power-of-two, if it isn't already. We do NOT impose | |
9933 | * any cq vs sq ring sizing. | |
9934 | */ | |
eb2667b3 | 9935 | if (!p->cq_entries) |
33a107f0 | 9936 | return -EINVAL; |
8110c1a6 JA |
9937 | if (p->cq_entries > IORING_MAX_CQ_ENTRIES) { |
9938 | if (!(p->flags & IORING_SETUP_CLAMP)) | |
9939 | return -EINVAL; | |
9940 | p->cq_entries = IORING_MAX_CQ_ENTRIES; | |
9941 | } | |
eb2667b3 JQ |
9942 | p->cq_entries = roundup_pow_of_two(p->cq_entries); |
9943 | if (p->cq_entries < p->sq_entries) | |
9944 | return -EINVAL; | |
33a107f0 JA |
9945 | } else { |
9946 | p->cq_entries = 2 * p->sq_entries; | |
9947 | } | |
2b188cc1 | 9948 | |
2b188cc1 | 9949 | ctx = io_ring_ctx_alloc(p); |
62e398be | 9950 | if (!ctx) |
2b188cc1 | 9951 | return -ENOMEM; |
2b188cc1 | 9952 | ctx->compat = in_compat_syscall(); |
62e398be JA |
9953 | if (!capable(CAP_IPC_LOCK)) |
9954 | ctx->user = get_uid(current_user()); | |
2aede0e4 JA |
9955 | |
9956 | /* | |
9957 | * This is just grabbed for accounting purposes. When a process exits, | |
9958 | * the mm is exited and dropped before the files, hence we need to hang | |
9959 | * on to this mm purely for the purposes of being able to unaccount | |
9960 | * memory (locked/pinned vm). It's not used for anything else. | |
9961 | */ | |
6b7898eb | 9962 | mmgrab(current->mm); |
2aede0e4 | 9963 | ctx->mm_account = current->mm; |
6b7898eb | 9964 | |
2b188cc1 JA |
9965 | ret = io_allocate_scq_urings(ctx, p); |
9966 | if (ret) | |
9967 | goto err; | |
9968 | ||
7e84e1c7 | 9969 | ret = io_sq_offload_create(ctx, p); |
2b188cc1 JA |
9970 | if (ret) |
9971 | goto err; | |
eae071c9 | 9972 | /* always set a rsrc node */ |
47b228ce PB |
9973 | ret = io_rsrc_node_switch_start(ctx); |
9974 | if (ret) | |
9975 | goto err; | |
eae071c9 | 9976 | io_rsrc_node_switch(ctx, NULL); |
2b188cc1 | 9977 | |
2b188cc1 | 9978 | memset(&p->sq_off, 0, sizeof(p->sq_off)); |
75b28aff HV |
9979 | p->sq_off.head = offsetof(struct io_rings, sq.head); |
9980 | p->sq_off.tail = offsetof(struct io_rings, sq.tail); | |
9981 | p->sq_off.ring_mask = offsetof(struct io_rings, sq_ring_mask); | |
9982 | p->sq_off.ring_entries = offsetof(struct io_rings, sq_ring_entries); | |
9983 | p->sq_off.flags = offsetof(struct io_rings, sq_flags); | |
9984 | p->sq_off.dropped = offsetof(struct io_rings, sq_dropped); | |
9985 | p->sq_off.array = (char *)ctx->sq_array - (char *)ctx->rings; | |
2b188cc1 JA |
9986 | |
9987 | memset(&p->cq_off, 0, sizeof(p->cq_off)); | |
75b28aff HV |
9988 | p->cq_off.head = offsetof(struct io_rings, cq.head); |
9989 | p->cq_off.tail = offsetof(struct io_rings, cq.tail); | |
9990 | p->cq_off.ring_mask = offsetof(struct io_rings, cq_ring_mask); | |
9991 | p->cq_off.ring_entries = offsetof(struct io_rings, cq_ring_entries); | |
9992 | p->cq_off.overflow = offsetof(struct io_rings, cq_overflow); | |
9993 | p->cq_off.cqes = offsetof(struct io_rings, cqes); | |
0d9b5b3a | 9994 | p->cq_off.flags = offsetof(struct io_rings, cq_flags); |
ac90f249 | 9995 | |
7f13657d XW |
9996 | p->features = IORING_FEAT_SINGLE_MMAP | IORING_FEAT_NODROP | |
9997 | IORING_FEAT_SUBMIT_STABLE | IORING_FEAT_RW_CUR_POS | | |
5769a351 | 9998 | IORING_FEAT_CUR_PERSONALITY | IORING_FEAT_FAST_POLL | |
c73ebb68 | 9999 | IORING_FEAT_POLL_32BITS | IORING_FEAT_SQPOLL_NONFIXED | |
9690557e PB |
10000 | IORING_FEAT_EXT_ARG | IORING_FEAT_NATIVE_WORKERS | |
10001 | IORING_FEAT_RSRC_TAGS; | |
7f13657d XW |
10002 | |
10003 | if (copy_to_user(params, p, sizeof(*p))) { | |
10004 | ret = -EFAULT; | |
10005 | goto err; | |
10006 | } | |
d1719f70 | 10007 | |
9faadcc8 PB |
10008 | file = io_uring_get_file(ctx); |
10009 | if (IS_ERR(file)) { | |
10010 | ret = PTR_ERR(file); | |
10011 | goto err; | |
10012 | } | |
10013 | ||
044c1ab3 JA |
10014 | /* |
10015 | * Install ring fd as the very last thing, so we don't risk someone | |
10016 | * having closed it before we finish setup | |
10017 | */ | |
9faadcc8 PB |
10018 | ret = io_uring_install_fd(ctx, file); |
10019 | if (ret < 0) { | |
10020 | /* fput will clean it up */ | |
10021 | fput(file); | |
10022 | return ret; | |
10023 | } | |
044c1ab3 | 10024 | |
c826bd7a | 10025 | trace_io_uring_create(ret, ctx, p->sq_entries, p->cq_entries, p->flags); |
2b188cc1 JA |
10026 | return ret; |
10027 | err: | |
10028 | io_ring_ctx_wait_and_kill(ctx); | |
10029 | return ret; | |
10030 | } | |
10031 | ||
10032 | /* | |
10033 | * Sets up an aio uring context, and returns the fd. Applications asks for a | |
10034 | * ring size, we return the actual sq/cq ring sizes (among other things) in the | |
10035 | * params structure passed in. | |
10036 | */ | |
10037 | static long io_uring_setup(u32 entries, struct io_uring_params __user *params) | |
10038 | { | |
10039 | struct io_uring_params p; | |
2b188cc1 JA |
10040 | int i; |
10041 | ||
10042 | if (copy_from_user(&p, params, sizeof(p))) | |
10043 | return -EFAULT; | |
10044 | for (i = 0; i < ARRAY_SIZE(p.resv); i++) { | |
10045 | if (p.resv[i]) | |
10046 | return -EINVAL; | |
10047 | } | |
10048 | ||
6c271ce2 | 10049 | if (p.flags & ~(IORING_SETUP_IOPOLL | IORING_SETUP_SQPOLL | |
8110c1a6 | 10050 | IORING_SETUP_SQ_AFF | IORING_SETUP_CQSIZE | |
7e84e1c7 SG |
10051 | IORING_SETUP_CLAMP | IORING_SETUP_ATTACH_WQ | |
10052 | IORING_SETUP_R_DISABLED)) | |
2b188cc1 JA |
10053 | return -EINVAL; |
10054 | ||
7f13657d | 10055 | return io_uring_create(entries, &p, params); |
2b188cc1 JA |
10056 | } |
10057 | ||
10058 | SYSCALL_DEFINE2(io_uring_setup, u32, entries, | |
10059 | struct io_uring_params __user *, params) | |
10060 | { | |
10061 | return io_uring_setup(entries, params); | |
10062 | } | |
10063 | ||
66f4af93 JA |
10064 | static int io_probe(struct io_ring_ctx *ctx, void __user *arg, unsigned nr_args) |
10065 | { | |
10066 | struct io_uring_probe *p; | |
10067 | size_t size; | |
10068 | int i, ret; | |
10069 | ||
10070 | size = struct_size(p, ops, nr_args); | |
10071 | if (size == SIZE_MAX) | |
10072 | return -EOVERFLOW; | |
10073 | p = kzalloc(size, GFP_KERNEL); | |
10074 | if (!p) | |
10075 | return -ENOMEM; | |
10076 | ||
10077 | ret = -EFAULT; | |
10078 | if (copy_from_user(p, arg, size)) | |
10079 | goto out; | |
10080 | ret = -EINVAL; | |
10081 | if (memchr_inv(p, 0, size)) | |
10082 | goto out; | |
10083 | ||
10084 | p->last_op = IORING_OP_LAST - 1; | |
10085 | if (nr_args > IORING_OP_LAST) | |
10086 | nr_args = IORING_OP_LAST; | |
10087 | ||
10088 | for (i = 0; i < nr_args; i++) { | |
10089 | p->ops[i].op = i; | |
10090 | if (!io_op_defs[i].not_supported) | |
10091 | p->ops[i].flags = IO_URING_OP_SUPPORTED; | |
10092 | } | |
10093 | p->ops_len = i; | |
10094 | ||
10095 | ret = 0; | |
10096 | if (copy_to_user(arg, p, size)) | |
10097 | ret = -EFAULT; | |
10098 | out: | |
10099 | kfree(p); | |
10100 | return ret; | |
10101 | } | |
10102 | ||
071698e1 JA |
10103 | static int io_register_personality(struct io_ring_ctx *ctx) |
10104 | { | |
4379bf8b | 10105 | const struct cred *creds; |
61cf9370 | 10106 | u32 id; |
1e6fa521 | 10107 | int ret; |
071698e1 | 10108 | |
4379bf8b | 10109 | creds = get_current_cred(); |
1e6fa521 | 10110 | |
61cf9370 MWO |
10111 | ret = xa_alloc_cyclic(&ctx->personalities, &id, (void *)creds, |
10112 | XA_LIMIT(0, USHRT_MAX), &ctx->pers_next, GFP_KERNEL); | |
a30f895a JA |
10113 | if (ret < 0) { |
10114 | put_cred(creds); | |
10115 | return ret; | |
10116 | } | |
10117 | return id; | |
071698e1 JA |
10118 | } |
10119 | ||
21b55dbc SG |
10120 | static int io_register_restrictions(struct io_ring_ctx *ctx, void __user *arg, |
10121 | unsigned int nr_args) | |
10122 | { | |
10123 | struct io_uring_restriction *res; | |
10124 | size_t size; | |
10125 | int i, ret; | |
10126 | ||
7e84e1c7 SG |
10127 | /* Restrictions allowed only if rings started disabled */ |
10128 | if (!(ctx->flags & IORING_SETUP_R_DISABLED)) | |
10129 | return -EBADFD; | |
10130 | ||
21b55dbc | 10131 | /* We allow only a single restrictions registration */ |
7e84e1c7 | 10132 | if (ctx->restrictions.registered) |
21b55dbc SG |
10133 | return -EBUSY; |
10134 | ||
10135 | if (!arg || nr_args > IORING_MAX_RESTRICTIONS) | |
10136 | return -EINVAL; | |
10137 | ||
10138 | size = array_size(nr_args, sizeof(*res)); | |
10139 | if (size == SIZE_MAX) | |
10140 | return -EOVERFLOW; | |
10141 | ||
10142 | res = memdup_user(arg, size); | |
10143 | if (IS_ERR(res)) | |
10144 | return PTR_ERR(res); | |
10145 | ||
10146 | ret = 0; | |
10147 | ||
10148 | for (i = 0; i < nr_args; i++) { | |
10149 | switch (res[i].opcode) { | |
10150 | case IORING_RESTRICTION_REGISTER_OP: | |
10151 | if (res[i].register_op >= IORING_REGISTER_LAST) { | |
10152 | ret = -EINVAL; | |
10153 | goto out; | |
10154 | } | |
10155 | ||
10156 | __set_bit(res[i].register_op, | |
10157 | ctx->restrictions.register_op); | |
10158 | break; | |
10159 | case IORING_RESTRICTION_SQE_OP: | |
10160 | if (res[i].sqe_op >= IORING_OP_LAST) { | |
10161 | ret = -EINVAL; | |
10162 | goto out; | |
10163 | } | |
10164 | ||
10165 | __set_bit(res[i].sqe_op, ctx->restrictions.sqe_op); | |
10166 | break; | |
10167 | case IORING_RESTRICTION_SQE_FLAGS_ALLOWED: | |
10168 | ctx->restrictions.sqe_flags_allowed = res[i].sqe_flags; | |
10169 | break; | |
10170 | case IORING_RESTRICTION_SQE_FLAGS_REQUIRED: | |
10171 | ctx->restrictions.sqe_flags_required = res[i].sqe_flags; | |
10172 | break; | |
10173 | default: | |
10174 | ret = -EINVAL; | |
10175 | goto out; | |
10176 | } | |
10177 | } | |
10178 | ||
10179 | out: | |
10180 | /* Reset all restrictions if an error happened */ | |
10181 | if (ret != 0) | |
10182 | memset(&ctx->restrictions, 0, sizeof(ctx->restrictions)); | |
10183 | else | |
7e84e1c7 | 10184 | ctx->restrictions.registered = true; |
21b55dbc SG |
10185 | |
10186 | kfree(res); | |
10187 | return ret; | |
10188 | } | |
10189 | ||
7e84e1c7 SG |
10190 | static int io_register_enable_rings(struct io_ring_ctx *ctx) |
10191 | { | |
10192 | if (!(ctx->flags & IORING_SETUP_R_DISABLED)) | |
10193 | return -EBADFD; | |
10194 | ||
10195 | if (ctx->restrictions.registered) | |
10196 | ctx->restricted = 1; | |
10197 | ||
0298ef96 PB |
10198 | ctx->flags &= ~IORING_SETUP_R_DISABLED; |
10199 | if (ctx->sq_data && wq_has_sleeper(&ctx->sq_data->wait)) | |
10200 | wake_up(&ctx->sq_data->wait); | |
7e84e1c7 SG |
10201 | return 0; |
10202 | } | |
10203 | ||
fdecb662 | 10204 | static int __io_register_rsrc_update(struct io_ring_ctx *ctx, unsigned type, |
c3bdad02 | 10205 | struct io_uring_rsrc_update2 *up, |
98f0b3b4 PB |
10206 | unsigned nr_args) |
10207 | { | |
10208 | __u32 tmp; | |
10209 | int err; | |
10210 | ||
c3bdad02 PB |
10211 | if (up->resv) |
10212 | return -EINVAL; | |
98f0b3b4 PB |
10213 | if (check_add_overflow(up->offset, nr_args, &tmp)) |
10214 | return -EOVERFLOW; | |
10215 | err = io_rsrc_node_switch_start(ctx); | |
10216 | if (err) | |
10217 | return err; | |
10218 | ||
fdecb662 PB |
10219 | switch (type) { |
10220 | case IORING_RSRC_FILE: | |
98f0b3b4 | 10221 | return __io_sqe_files_update(ctx, up, nr_args); |
634d00df PB |
10222 | case IORING_RSRC_BUFFER: |
10223 | return __io_sqe_buffers_update(ctx, up, nr_args); | |
98f0b3b4 PB |
10224 | } |
10225 | return -EINVAL; | |
10226 | } | |
10227 | ||
c3bdad02 PB |
10228 | static int io_register_files_update(struct io_ring_ctx *ctx, void __user *arg, |
10229 | unsigned nr_args) | |
98f0b3b4 | 10230 | { |
c3bdad02 | 10231 | struct io_uring_rsrc_update2 up; |
98f0b3b4 PB |
10232 | |
10233 | if (!nr_args) | |
10234 | return -EINVAL; | |
c3bdad02 PB |
10235 | memset(&up, 0, sizeof(up)); |
10236 | if (copy_from_user(&up, arg, sizeof(struct io_uring_rsrc_update))) | |
10237 | return -EFAULT; | |
10238 | return __io_register_rsrc_update(ctx, IORING_RSRC_FILE, &up, nr_args); | |
10239 | } | |
10240 | ||
10241 | static int io_register_rsrc_update(struct io_ring_ctx *ctx, void __user *arg, | |
992da01a | 10242 | unsigned size, unsigned type) |
c3bdad02 PB |
10243 | { |
10244 | struct io_uring_rsrc_update2 up; | |
10245 | ||
10246 | if (size != sizeof(up)) | |
10247 | return -EINVAL; | |
98f0b3b4 PB |
10248 | if (copy_from_user(&up, arg, sizeof(up))) |
10249 | return -EFAULT; | |
992da01a | 10250 | if (!up.nr || up.resv) |
98f0b3b4 | 10251 | return -EINVAL; |
992da01a | 10252 | return __io_register_rsrc_update(ctx, type, &up, up.nr); |
98f0b3b4 PB |
10253 | } |
10254 | ||
792e3582 | 10255 | static int io_register_rsrc(struct io_ring_ctx *ctx, void __user *arg, |
992da01a | 10256 | unsigned int size, unsigned int type) |
792e3582 PB |
10257 | { |
10258 | struct io_uring_rsrc_register rr; | |
10259 | ||
10260 | /* keep it extendible */ | |
10261 | if (size != sizeof(rr)) | |
10262 | return -EINVAL; | |
10263 | ||
10264 | memset(&rr, 0, sizeof(rr)); | |
10265 | if (copy_from_user(&rr, arg, size)) | |
10266 | return -EFAULT; | |
992da01a | 10267 | if (!rr.nr || rr.resv || rr.resv2) |
792e3582 PB |
10268 | return -EINVAL; |
10269 | ||
992da01a | 10270 | switch (type) { |
792e3582 PB |
10271 | case IORING_RSRC_FILE: |
10272 | return io_sqe_files_register(ctx, u64_to_user_ptr(rr.data), | |
10273 | rr.nr, u64_to_user_ptr(rr.tags)); | |
634d00df PB |
10274 | case IORING_RSRC_BUFFER: |
10275 | return io_sqe_buffers_register(ctx, u64_to_user_ptr(rr.data), | |
10276 | rr.nr, u64_to_user_ptr(rr.tags)); | |
792e3582 PB |
10277 | } |
10278 | return -EINVAL; | |
10279 | } | |
10280 | ||
fe76421d JA |
10281 | static int io_register_iowq_aff(struct io_ring_ctx *ctx, void __user *arg, |
10282 | unsigned len) | |
10283 | { | |
10284 | struct io_uring_task *tctx = current->io_uring; | |
10285 | cpumask_var_t new_mask; | |
10286 | int ret; | |
10287 | ||
10288 | if (!tctx || !tctx->io_wq) | |
10289 | return -EINVAL; | |
10290 | ||
10291 | if (!alloc_cpumask_var(&new_mask, GFP_KERNEL)) | |
10292 | return -ENOMEM; | |
10293 | ||
10294 | cpumask_clear(new_mask); | |
10295 | if (len > cpumask_size()) | |
10296 | len = cpumask_size(); | |
10297 | ||
10298 | if (copy_from_user(new_mask, arg, len)) { | |
10299 | free_cpumask_var(new_mask); | |
10300 | return -EFAULT; | |
10301 | } | |
10302 | ||
10303 | ret = io_wq_cpu_affinity(tctx->io_wq, new_mask); | |
10304 | free_cpumask_var(new_mask); | |
10305 | return ret; | |
10306 | } | |
10307 | ||
10308 | static int io_unregister_iowq_aff(struct io_ring_ctx *ctx) | |
10309 | { | |
10310 | struct io_uring_task *tctx = current->io_uring; | |
10311 | ||
10312 | if (!tctx || !tctx->io_wq) | |
10313 | return -EINVAL; | |
10314 | ||
10315 | return io_wq_cpu_affinity(tctx->io_wq, NULL); | |
10316 | } | |
10317 | ||
2e480058 JA |
10318 | static int io_register_iowq_max_workers(struct io_ring_ctx *ctx, |
10319 | void __user *arg) | |
10320 | { | |
10321 | struct io_uring_task *tctx = current->io_uring; | |
10322 | __u32 new_count[2]; | |
10323 | int i, ret; | |
10324 | ||
10325 | if (!tctx || !tctx->io_wq) | |
10326 | return -EINVAL; | |
10327 | if (copy_from_user(new_count, arg, sizeof(new_count))) | |
10328 | return -EFAULT; | |
10329 | for (i = 0; i < ARRAY_SIZE(new_count); i++) | |
10330 | if (new_count[i] > INT_MAX) | |
10331 | return -EINVAL; | |
10332 | ||
10333 | ret = io_wq_max_workers(tctx->io_wq, new_count); | |
10334 | if (ret) | |
10335 | return ret; | |
10336 | ||
10337 | if (copy_to_user(arg, new_count, sizeof(new_count))) | |
10338 | return -EFAULT; | |
10339 | ||
10340 | return 0; | |
10341 | } | |
10342 | ||
071698e1 JA |
10343 | static bool io_register_op_must_quiesce(int op) |
10344 | { | |
10345 | switch (op) { | |
bd54b6fe BM |
10346 | case IORING_REGISTER_BUFFERS: |
10347 | case IORING_UNREGISTER_BUFFERS: | |
f4f7d21c | 10348 | case IORING_REGISTER_FILES: |
071698e1 JA |
10349 | case IORING_UNREGISTER_FILES: |
10350 | case IORING_REGISTER_FILES_UPDATE: | |
10351 | case IORING_REGISTER_PROBE: | |
10352 | case IORING_REGISTER_PERSONALITY: | |
10353 | case IORING_UNREGISTER_PERSONALITY: | |
992da01a PB |
10354 | case IORING_REGISTER_FILES2: |
10355 | case IORING_REGISTER_FILES_UPDATE2: | |
10356 | case IORING_REGISTER_BUFFERS2: | |
10357 | case IORING_REGISTER_BUFFERS_UPDATE: | |
fe76421d JA |
10358 | case IORING_REGISTER_IOWQ_AFF: |
10359 | case IORING_UNREGISTER_IOWQ_AFF: | |
2e480058 | 10360 | case IORING_REGISTER_IOWQ_MAX_WORKERS: |
071698e1 JA |
10361 | return false; |
10362 | default: | |
10363 | return true; | |
10364 | } | |
10365 | } | |
10366 | ||
e73c5c7c PB |
10367 | static int io_ctx_quiesce(struct io_ring_ctx *ctx) |
10368 | { | |
10369 | long ret; | |
10370 | ||
10371 | percpu_ref_kill(&ctx->refs); | |
10372 | ||
10373 | /* | |
10374 | * Drop uring mutex before waiting for references to exit. If another | |
10375 | * thread is currently inside io_uring_enter() it might need to grab the | |
10376 | * uring_lock to make progress. If we hold it here across the drain | |
10377 | * wait, then we can deadlock. It's safe to drop the mutex here, since | |
10378 | * no new references will come in after we've killed the percpu ref. | |
10379 | */ | |
10380 | mutex_unlock(&ctx->uring_lock); | |
10381 | do { | |
10382 | ret = wait_for_completion_interruptible(&ctx->ref_comp); | |
10383 | if (!ret) | |
10384 | break; | |
10385 | ret = io_run_task_work_sig(); | |
10386 | } while (ret >= 0); | |
10387 | mutex_lock(&ctx->uring_lock); | |
10388 | ||
10389 | if (ret) | |
10390 | io_refs_resurrect(&ctx->refs, &ctx->ref_comp); | |
10391 | return ret; | |
10392 | } | |
10393 | ||
edafccee JA |
10394 | static int __io_uring_register(struct io_ring_ctx *ctx, unsigned opcode, |
10395 | void __user *arg, unsigned nr_args) | |
b19062a5 JA |
10396 | __releases(ctx->uring_lock) |
10397 | __acquires(ctx->uring_lock) | |
edafccee JA |
10398 | { |
10399 | int ret; | |
10400 | ||
35fa71a0 JA |
10401 | /* |
10402 | * We're inside the ring mutex, if the ref is already dying, then | |
10403 | * someone else killed the ctx or is already going through | |
10404 | * io_uring_register(). | |
10405 | */ | |
10406 | if (percpu_ref_is_dying(&ctx->refs)) | |
10407 | return -ENXIO; | |
10408 | ||
75c4021a PB |
10409 | if (ctx->restricted) { |
10410 | if (opcode >= IORING_REGISTER_LAST) | |
10411 | return -EINVAL; | |
10412 | opcode = array_index_nospec(opcode, IORING_REGISTER_LAST); | |
10413 | if (!test_bit(opcode, ctx->restrictions.register_op)) | |
10414 | return -EACCES; | |
10415 | } | |
10416 | ||
071698e1 | 10417 | if (io_register_op_must_quiesce(opcode)) { |
e73c5c7c PB |
10418 | ret = io_ctx_quiesce(ctx); |
10419 | if (ret) | |
f70865db | 10420 | return ret; |
05f3fb3c | 10421 | } |
edafccee JA |
10422 | |
10423 | switch (opcode) { | |
10424 | case IORING_REGISTER_BUFFERS: | |
634d00df | 10425 | ret = io_sqe_buffers_register(ctx, arg, nr_args, NULL); |
edafccee JA |
10426 | break; |
10427 | case IORING_UNREGISTER_BUFFERS: | |
10428 | ret = -EINVAL; | |
10429 | if (arg || nr_args) | |
10430 | break; | |
0a96bbe4 | 10431 | ret = io_sqe_buffers_unregister(ctx); |
edafccee | 10432 | break; |
6b06314c | 10433 | case IORING_REGISTER_FILES: |
792e3582 | 10434 | ret = io_sqe_files_register(ctx, arg, nr_args, NULL); |
6b06314c JA |
10435 | break; |
10436 | case IORING_UNREGISTER_FILES: | |
10437 | ret = -EINVAL; | |
10438 | if (arg || nr_args) | |
10439 | break; | |
10440 | ret = io_sqe_files_unregister(ctx); | |
10441 | break; | |
c3a31e60 | 10442 | case IORING_REGISTER_FILES_UPDATE: |
c3bdad02 | 10443 | ret = io_register_files_update(ctx, arg, nr_args); |
c3a31e60 | 10444 | break; |
9b402849 | 10445 | case IORING_REGISTER_EVENTFD: |
f2842ab5 | 10446 | case IORING_REGISTER_EVENTFD_ASYNC: |
9b402849 JA |
10447 | ret = -EINVAL; |
10448 | if (nr_args != 1) | |
10449 | break; | |
10450 | ret = io_eventfd_register(ctx, arg); | |
f2842ab5 JA |
10451 | if (ret) |
10452 | break; | |
10453 | if (opcode == IORING_REGISTER_EVENTFD_ASYNC) | |
10454 | ctx->eventfd_async = 1; | |
10455 | else | |
10456 | ctx->eventfd_async = 0; | |
9b402849 JA |
10457 | break; |
10458 | case IORING_UNREGISTER_EVENTFD: | |
10459 | ret = -EINVAL; | |
10460 | if (arg || nr_args) | |
10461 | break; | |
10462 | ret = io_eventfd_unregister(ctx); | |
10463 | break; | |
66f4af93 JA |
10464 | case IORING_REGISTER_PROBE: |
10465 | ret = -EINVAL; | |
10466 | if (!arg || nr_args > 256) | |
10467 | break; | |
10468 | ret = io_probe(ctx, arg, nr_args); | |
10469 | break; | |
071698e1 JA |
10470 | case IORING_REGISTER_PERSONALITY: |
10471 | ret = -EINVAL; | |
10472 | if (arg || nr_args) | |
10473 | break; | |
10474 | ret = io_register_personality(ctx); | |
10475 | break; | |
10476 | case IORING_UNREGISTER_PERSONALITY: | |
10477 | ret = -EINVAL; | |
10478 | if (arg) | |
10479 | break; | |
10480 | ret = io_unregister_personality(ctx, nr_args); | |
10481 | break; | |
7e84e1c7 SG |
10482 | case IORING_REGISTER_ENABLE_RINGS: |
10483 | ret = -EINVAL; | |
10484 | if (arg || nr_args) | |
10485 | break; | |
10486 | ret = io_register_enable_rings(ctx); | |
10487 | break; | |
21b55dbc SG |
10488 | case IORING_REGISTER_RESTRICTIONS: |
10489 | ret = io_register_restrictions(ctx, arg, nr_args); | |
10490 | break; | |
992da01a PB |
10491 | case IORING_REGISTER_FILES2: |
10492 | ret = io_register_rsrc(ctx, arg, nr_args, IORING_RSRC_FILE); | |
10493 | break; | |
10494 | case IORING_REGISTER_FILES_UPDATE2: | |
10495 | ret = io_register_rsrc_update(ctx, arg, nr_args, | |
10496 | IORING_RSRC_FILE); | |
10497 | break; | |
10498 | case IORING_REGISTER_BUFFERS2: | |
10499 | ret = io_register_rsrc(ctx, arg, nr_args, IORING_RSRC_BUFFER); | |
792e3582 | 10500 | break; |
992da01a PB |
10501 | case IORING_REGISTER_BUFFERS_UPDATE: |
10502 | ret = io_register_rsrc_update(ctx, arg, nr_args, | |
10503 | IORING_RSRC_BUFFER); | |
c3bdad02 | 10504 | break; |
fe76421d JA |
10505 | case IORING_REGISTER_IOWQ_AFF: |
10506 | ret = -EINVAL; | |
10507 | if (!arg || !nr_args) | |
10508 | break; | |
10509 | ret = io_register_iowq_aff(ctx, arg, nr_args); | |
10510 | break; | |
10511 | case IORING_UNREGISTER_IOWQ_AFF: | |
10512 | ret = -EINVAL; | |
10513 | if (arg || nr_args) | |
10514 | break; | |
10515 | ret = io_unregister_iowq_aff(ctx); | |
10516 | break; | |
2e480058 JA |
10517 | case IORING_REGISTER_IOWQ_MAX_WORKERS: |
10518 | ret = -EINVAL; | |
10519 | if (!arg || nr_args != 2) | |
10520 | break; | |
10521 | ret = io_register_iowq_max_workers(ctx, arg); | |
10522 | break; | |
edafccee JA |
10523 | default: |
10524 | ret = -EINVAL; | |
10525 | break; | |
10526 | } | |
10527 | ||
071698e1 | 10528 | if (io_register_op_must_quiesce(opcode)) { |
05f3fb3c | 10529 | /* bring the ctx back to life */ |
05f3fb3c | 10530 | percpu_ref_reinit(&ctx->refs); |
0f158b4c | 10531 | reinit_completion(&ctx->ref_comp); |
05f3fb3c | 10532 | } |
edafccee JA |
10533 | return ret; |
10534 | } | |
10535 | ||
10536 | SYSCALL_DEFINE4(io_uring_register, unsigned int, fd, unsigned int, opcode, | |
10537 | void __user *, arg, unsigned int, nr_args) | |
10538 | { | |
10539 | struct io_ring_ctx *ctx; | |
10540 | long ret = -EBADF; | |
10541 | struct fd f; | |
10542 | ||
10543 | f = fdget(fd); | |
10544 | if (!f.file) | |
10545 | return -EBADF; | |
10546 | ||
10547 | ret = -EOPNOTSUPP; | |
10548 | if (f.file->f_op != &io_uring_fops) | |
10549 | goto out_fput; | |
10550 | ||
10551 | ctx = f.file->private_data; | |
10552 | ||
b6c23dd5 PB |
10553 | io_run_task_work(); |
10554 | ||
edafccee JA |
10555 | mutex_lock(&ctx->uring_lock); |
10556 | ret = __io_uring_register(ctx, opcode, arg, nr_args); | |
10557 | mutex_unlock(&ctx->uring_lock); | |
c826bd7a DD |
10558 | trace_io_uring_register(ctx, opcode, ctx->nr_user_files, ctx->nr_user_bufs, |
10559 | ctx->cq_ev_fd != NULL, ret); | |
edafccee JA |
10560 | out_fput: |
10561 | fdput(f); | |
10562 | return ret; | |
10563 | } | |
10564 | ||
2b188cc1 JA |
10565 | static int __init io_uring_init(void) |
10566 | { | |
d7f62e82 SM |
10567 | #define __BUILD_BUG_VERIFY_ELEMENT(stype, eoffset, etype, ename) do { \ |
10568 | BUILD_BUG_ON(offsetof(stype, ename) != eoffset); \ | |
10569 | BUILD_BUG_ON(sizeof(etype) != sizeof_field(stype, ename)); \ | |
10570 | } while (0) | |
10571 | ||
10572 | #define BUILD_BUG_SQE_ELEM(eoffset, etype, ename) \ | |
10573 | __BUILD_BUG_VERIFY_ELEMENT(struct io_uring_sqe, eoffset, etype, ename) | |
10574 | BUILD_BUG_ON(sizeof(struct io_uring_sqe) != 64); | |
10575 | BUILD_BUG_SQE_ELEM(0, __u8, opcode); | |
10576 | BUILD_BUG_SQE_ELEM(1, __u8, flags); | |
10577 | BUILD_BUG_SQE_ELEM(2, __u16, ioprio); | |
10578 | BUILD_BUG_SQE_ELEM(4, __s32, fd); | |
10579 | BUILD_BUG_SQE_ELEM(8, __u64, off); | |
10580 | BUILD_BUG_SQE_ELEM(8, __u64, addr2); | |
10581 | BUILD_BUG_SQE_ELEM(16, __u64, addr); | |
7d67af2c | 10582 | BUILD_BUG_SQE_ELEM(16, __u64, splice_off_in); |
d7f62e82 SM |
10583 | BUILD_BUG_SQE_ELEM(24, __u32, len); |
10584 | BUILD_BUG_SQE_ELEM(28, __kernel_rwf_t, rw_flags); | |
10585 | BUILD_BUG_SQE_ELEM(28, /* compat */ int, rw_flags); | |
10586 | BUILD_BUG_SQE_ELEM(28, /* compat */ __u32, rw_flags); | |
10587 | BUILD_BUG_SQE_ELEM(28, __u32, fsync_flags); | |
5769a351 JX |
10588 | BUILD_BUG_SQE_ELEM(28, /* compat */ __u16, poll_events); |
10589 | BUILD_BUG_SQE_ELEM(28, __u32, poll32_events); | |
d7f62e82 SM |
10590 | BUILD_BUG_SQE_ELEM(28, __u32, sync_range_flags); |
10591 | BUILD_BUG_SQE_ELEM(28, __u32, msg_flags); | |
10592 | BUILD_BUG_SQE_ELEM(28, __u32, timeout_flags); | |
10593 | BUILD_BUG_SQE_ELEM(28, __u32, accept_flags); | |
10594 | BUILD_BUG_SQE_ELEM(28, __u32, cancel_flags); | |
10595 | BUILD_BUG_SQE_ELEM(28, __u32, open_flags); | |
10596 | BUILD_BUG_SQE_ELEM(28, __u32, statx_flags); | |
10597 | BUILD_BUG_SQE_ELEM(28, __u32, fadvise_advice); | |
7d67af2c | 10598 | BUILD_BUG_SQE_ELEM(28, __u32, splice_flags); |
d7f62e82 SM |
10599 | BUILD_BUG_SQE_ELEM(32, __u64, user_data); |
10600 | BUILD_BUG_SQE_ELEM(40, __u16, buf_index); | |
16340eab | 10601 | BUILD_BUG_SQE_ELEM(40, __u16, buf_group); |
d7f62e82 | 10602 | BUILD_BUG_SQE_ELEM(42, __u16, personality); |
7d67af2c | 10603 | BUILD_BUG_SQE_ELEM(44, __s32, splice_fd_in); |
b9445598 | 10604 | BUILD_BUG_SQE_ELEM(44, __u32, file_index); |
d7f62e82 | 10605 | |
b0d658ec PB |
10606 | BUILD_BUG_ON(sizeof(struct io_uring_files_update) != |
10607 | sizeof(struct io_uring_rsrc_update)); | |
10608 | BUILD_BUG_ON(sizeof(struct io_uring_rsrc_update) > | |
10609 | sizeof(struct io_uring_rsrc_update2)); | |
90499ad0 PB |
10610 | |
10611 | /* ->buf_index is u16 */ | |
10612 | BUILD_BUG_ON(IORING_MAX_REG_BUFFERS >= (1u << 16)); | |
10613 | ||
b0d658ec PB |
10614 | /* should fit into one byte */ |
10615 | BUILD_BUG_ON(SQE_VALID_FLAGS >= (1 << 8)); | |
10616 | ||
d3656344 | 10617 | BUILD_BUG_ON(ARRAY_SIZE(io_op_defs) != IORING_OP_LAST); |
84557871 | 10618 | BUILD_BUG_ON(__REQ_F_LAST_BIT >= 8 * sizeof(int)); |
16340eab | 10619 | |
91f245d5 JA |
10620 | req_cachep = KMEM_CACHE(io_kiocb, SLAB_HWCACHE_ALIGN | SLAB_PANIC | |
10621 | SLAB_ACCOUNT); | |
2b188cc1 JA |
10622 | return 0; |
10623 | }; | |
10624 | __initcall(io_uring_init); |