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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 | 504 | int fd; |
7df778be | 505 | u32 file_slot; |
b5dba59e JA |
506 | }; |
507 | ||
ad8a48ac JA |
508 | struct io_timeout_data { |
509 | struct io_kiocb *req; | |
510 | struct hrtimer timer; | |
511 | struct timespec64 ts; | |
512 | enum hrtimer_mode mode; | |
50c1df2b | 513 | u32 flags; |
ad8a48ac JA |
514 | }; |
515 | ||
8ed8d3c3 JA |
516 | struct io_accept { |
517 | struct file *file; | |
518 | struct sockaddr __user *addr; | |
519 | int __user *addr_len; | |
520 | int flags; | |
aaa4db12 | 521 | u32 file_slot; |
09952e3e | 522 | unsigned long nofile; |
8ed8d3c3 JA |
523 | }; |
524 | ||
525 | struct io_sync { | |
526 | struct file *file; | |
527 | loff_t len; | |
528 | loff_t off; | |
529 | int flags; | |
d63d1b5e | 530 | int mode; |
8ed8d3c3 JA |
531 | }; |
532 | ||
fbf23849 JA |
533 | struct io_cancel { |
534 | struct file *file; | |
535 | u64 addr; | |
536 | }; | |
537 | ||
b29472ee JA |
538 | struct io_timeout { |
539 | struct file *file; | |
bfe68a22 PB |
540 | u32 off; |
541 | u32 target_seq; | |
135fcde8 | 542 | struct list_head list; |
90cd7e42 PB |
543 | /* head of the link, used by linked timeouts only */ |
544 | struct io_kiocb *head; | |
89b263f6 JA |
545 | /* for linked completions */ |
546 | struct io_kiocb *prev; | |
b29472ee JA |
547 | }; |
548 | ||
0bdf7a2d PB |
549 | struct io_timeout_rem { |
550 | struct file *file; | |
551 | u64 addr; | |
9c8e11b3 PB |
552 | |
553 | /* timeout update */ | |
554 | struct timespec64 ts; | |
555 | u32 flags; | |
f1042b6c | 556 | bool ltimeout; |
0bdf7a2d PB |
557 | }; |
558 | ||
9adbd45d JA |
559 | struct io_rw { |
560 | /* NOTE: kiocb has the file as the first member, so don't do it here */ | |
561 | struct kiocb kiocb; | |
562 | u64 addr; | |
563 | u64 len; | |
564 | }; | |
565 | ||
3fbb51c1 JA |
566 | struct io_connect { |
567 | struct file *file; | |
568 | struct sockaddr __user *addr; | |
569 | int addr_len; | |
570 | }; | |
571 | ||
e47293fd JA |
572 | struct io_sr_msg { |
573 | struct file *file; | |
fddaface | 574 | union { |
4af3417a PB |
575 | struct compat_msghdr __user *umsg_compat; |
576 | struct user_msghdr __user *umsg; | |
577 | void __user *buf; | |
fddaface | 578 | }; |
e47293fd | 579 | int msg_flags; |
bcda7baa | 580 | int bgid; |
fddaface | 581 | size_t len; |
bcda7baa | 582 | struct io_buffer *kbuf; |
e47293fd JA |
583 | }; |
584 | ||
15b71abe JA |
585 | struct io_open { |
586 | struct file *file; | |
587 | int dfd; | |
b9445598 | 588 | u32 file_slot; |
15b71abe | 589 | struct filename *filename; |
c12cedf2 | 590 | struct open_how how; |
4022e7af | 591 | unsigned long nofile; |
15b71abe JA |
592 | }; |
593 | ||
269bbe5f | 594 | struct io_rsrc_update { |
05f3fb3c JA |
595 | struct file *file; |
596 | u64 arg; | |
597 | u32 nr_args; | |
598 | u32 offset; | |
599 | }; | |
600 | ||
4840e418 JA |
601 | struct io_fadvise { |
602 | struct file *file; | |
603 | u64 offset; | |
604 | u32 len; | |
605 | u32 advice; | |
606 | }; | |
607 | ||
c1ca757b JA |
608 | struct io_madvise { |
609 | struct file *file; | |
610 | u64 addr; | |
611 | u32 len; | |
612 | u32 advice; | |
613 | }; | |
614 | ||
3e4827b0 JA |
615 | struct io_epoll { |
616 | struct file *file; | |
617 | int epfd; | |
618 | int op; | |
619 | int fd; | |
620 | struct epoll_event event; | |
e47293fd JA |
621 | }; |
622 | ||
7d67af2c PB |
623 | struct io_splice { |
624 | struct file *file_out; | |
625 | struct file *file_in; | |
626 | loff_t off_out; | |
627 | loff_t off_in; | |
628 | u64 len; | |
629 | unsigned int flags; | |
630 | }; | |
631 | ||
ddf0322d JA |
632 | struct io_provide_buf { |
633 | struct file *file; | |
634 | __u64 addr; | |
38134ada | 635 | __u32 len; |
ddf0322d JA |
636 | __u32 bgid; |
637 | __u16 nbufs; | |
638 | __u16 bid; | |
639 | }; | |
640 | ||
1d9e1288 BM |
641 | struct io_statx { |
642 | struct file *file; | |
643 | int dfd; | |
644 | unsigned int mask; | |
645 | unsigned int flags; | |
e62753e4 | 646 | const char __user *filename; |
1d9e1288 BM |
647 | struct statx __user *buffer; |
648 | }; | |
649 | ||
36f4fa68 JA |
650 | struct io_shutdown { |
651 | struct file *file; | |
652 | int how; | |
653 | }; | |
654 | ||
80a261fd JA |
655 | struct io_rename { |
656 | struct file *file; | |
657 | int old_dfd; | |
658 | int new_dfd; | |
659 | struct filename *oldpath; | |
660 | struct filename *newpath; | |
661 | int flags; | |
662 | }; | |
663 | ||
14a1143b JA |
664 | struct io_unlink { |
665 | struct file *file; | |
666 | int dfd; | |
667 | int flags; | |
668 | struct filename *filename; | |
669 | }; | |
670 | ||
e34a02dc DK |
671 | struct io_mkdir { |
672 | struct file *file; | |
673 | int dfd; | |
674 | umode_t mode; | |
675 | struct filename *filename; | |
676 | }; | |
677 | ||
7a8721f8 DK |
678 | struct io_symlink { |
679 | struct file *file; | |
680 | int new_dfd; | |
681 | struct filename *oldpath; | |
682 | struct filename *newpath; | |
683 | }; | |
684 | ||
cf30da90 DK |
685 | struct io_hardlink { |
686 | struct file *file; | |
687 | int old_dfd; | |
688 | int new_dfd; | |
689 | struct filename *oldpath; | |
690 | struct filename *newpath; | |
691 | int flags; | |
692 | }; | |
693 | ||
3ca405eb PB |
694 | struct io_completion { |
695 | struct file *file; | |
8c3f9cd1 | 696 | u32 cflags; |
3ca405eb PB |
697 | }; |
698 | ||
f499a021 JA |
699 | struct io_async_connect { |
700 | struct sockaddr_storage address; | |
701 | }; | |
702 | ||
03b1230c JA |
703 | struct io_async_msghdr { |
704 | struct iovec fast_iov[UIO_FASTIOV]; | |
257e84a5 PB |
705 | /* points to an allocated iov, if NULL we use fast_iov instead */ |
706 | struct iovec *free_iov; | |
03b1230c JA |
707 | struct sockaddr __user *uaddr; |
708 | struct msghdr msg; | |
b537916c | 709 | struct sockaddr_storage addr; |
03b1230c JA |
710 | }; |
711 | ||
f67676d1 JA |
712 | struct io_async_rw { |
713 | struct iovec fast_iov[UIO_FASTIOV]; | |
ff6165b2 JA |
714 | const struct iovec *free_iovec; |
715 | struct iov_iter iter; | |
cd658695 | 716 | struct iov_iter_state iter_state; |
227c0c96 | 717 | size_t bytes_done; |
bcf5a063 | 718 | struct wait_page_queue wpq; |
f67676d1 JA |
719 | }; |
720 | ||
6b47ee6e PB |
721 | enum { |
722 | REQ_F_FIXED_FILE_BIT = IOSQE_FIXED_FILE_BIT, | |
723 | REQ_F_IO_DRAIN_BIT = IOSQE_IO_DRAIN_BIT, | |
724 | REQ_F_LINK_BIT = IOSQE_IO_LINK_BIT, | |
725 | REQ_F_HARDLINK_BIT = IOSQE_IO_HARDLINK_BIT, | |
726 | REQ_F_FORCE_ASYNC_BIT = IOSQE_ASYNC_BIT, | |
bcda7baa | 727 | REQ_F_BUFFER_SELECT_BIT = IOSQE_BUFFER_SELECT_BIT, |
6b47ee6e | 728 | |
dddca226 | 729 | /* first byte is taken by user flags, shift it to not overlap */ |
93d2bcd2 | 730 | REQ_F_FAIL_BIT = 8, |
6b47ee6e PB |
731 | REQ_F_INFLIGHT_BIT, |
732 | REQ_F_CUR_POS_BIT, | |
733 | REQ_F_NOWAIT_BIT, | |
6b47ee6e | 734 | REQ_F_LINK_TIMEOUT_BIT, |
99bc4c38 | 735 | REQ_F_NEED_CLEANUP_BIT, |
d7718a9d | 736 | REQ_F_POLLED_BIT, |
bcda7baa | 737 | REQ_F_BUFFER_SELECTED_BIT, |
e342c807 | 738 | REQ_F_COMPLETE_INLINE_BIT, |
230d50d4 | 739 | REQ_F_REISSUE_BIT, |
b8e64b53 | 740 | REQ_F_CREDS_BIT, |
20e60a38 | 741 | REQ_F_REFCOUNT_BIT, |
4d13d1a4 | 742 | REQ_F_ARM_LTIMEOUT_BIT, |
7b29f92d | 743 | /* keep async read/write and isreg together and in order */ |
b191e2df PB |
744 | REQ_F_NOWAIT_READ_BIT, |
745 | REQ_F_NOWAIT_WRITE_BIT, | |
7b29f92d | 746 | REQ_F_ISREG_BIT, |
84557871 JA |
747 | |
748 | /* not a real bit, just to check we're not overflowing the space */ | |
749 | __REQ_F_LAST_BIT, | |
6b47ee6e PB |
750 | }; |
751 | ||
752 | enum { | |
753 | /* ctx owns file */ | |
754 | REQ_F_FIXED_FILE = BIT(REQ_F_FIXED_FILE_BIT), | |
755 | /* drain existing IO first */ | |
756 | REQ_F_IO_DRAIN = BIT(REQ_F_IO_DRAIN_BIT), | |
757 | /* linked sqes */ | |
758 | REQ_F_LINK = BIT(REQ_F_LINK_BIT), | |
759 | /* doesn't sever on completion < 0 */ | |
760 | REQ_F_HARDLINK = BIT(REQ_F_HARDLINK_BIT), | |
761 | /* IOSQE_ASYNC */ | |
762 | REQ_F_FORCE_ASYNC = BIT(REQ_F_FORCE_ASYNC_BIT), | |
bcda7baa JA |
763 | /* IOSQE_BUFFER_SELECT */ |
764 | REQ_F_BUFFER_SELECT = BIT(REQ_F_BUFFER_SELECT_BIT), | |
6b47ee6e | 765 | |
6b47ee6e | 766 | /* fail rest of links */ |
93d2bcd2 | 767 | REQ_F_FAIL = BIT(REQ_F_FAIL_BIT), |
b05a1bcd | 768 | /* on inflight list, should be cancelled and waited on exit reliably */ |
6b47ee6e PB |
769 | REQ_F_INFLIGHT = BIT(REQ_F_INFLIGHT_BIT), |
770 | /* read/write uses file position */ | |
771 | REQ_F_CUR_POS = BIT(REQ_F_CUR_POS_BIT), | |
772 | /* must not punt to workers */ | |
773 | REQ_F_NOWAIT = BIT(REQ_F_NOWAIT_BIT), | |
900fad45 | 774 | /* has or had linked timeout */ |
6b47ee6e | 775 | REQ_F_LINK_TIMEOUT = BIT(REQ_F_LINK_TIMEOUT_BIT), |
99bc4c38 PB |
776 | /* needs cleanup */ |
777 | REQ_F_NEED_CLEANUP = BIT(REQ_F_NEED_CLEANUP_BIT), | |
d7718a9d JA |
778 | /* already went through poll handler */ |
779 | REQ_F_POLLED = BIT(REQ_F_POLLED_BIT), | |
bcda7baa JA |
780 | /* buffer already selected */ |
781 | REQ_F_BUFFER_SELECTED = BIT(REQ_F_BUFFER_SELECTED_BIT), | |
e342c807 PB |
782 | /* completion is deferred through io_comp_state */ |
783 | REQ_F_COMPLETE_INLINE = BIT(REQ_F_COMPLETE_INLINE_BIT), | |
230d50d4 JA |
784 | /* caller should reissue async */ |
785 | REQ_F_REISSUE = BIT(REQ_F_REISSUE_BIT), | |
7b29f92d | 786 | /* supports async reads */ |
b191e2df | 787 | REQ_F_NOWAIT_READ = BIT(REQ_F_NOWAIT_READ_BIT), |
7b29f92d | 788 | /* supports async writes */ |
b191e2df | 789 | REQ_F_NOWAIT_WRITE = BIT(REQ_F_NOWAIT_WRITE_BIT), |
7b29f92d JA |
790 | /* regular file */ |
791 | REQ_F_ISREG = BIT(REQ_F_ISREG_BIT), | |
b8e64b53 PB |
792 | /* has creds assigned */ |
793 | REQ_F_CREDS = BIT(REQ_F_CREDS_BIT), | |
20e60a38 PB |
794 | /* skip refcounting if not set */ |
795 | REQ_F_REFCOUNT = BIT(REQ_F_REFCOUNT_BIT), | |
4d13d1a4 PB |
796 | /* there is a linked timeout that has to be armed */ |
797 | REQ_F_ARM_LTIMEOUT = BIT(REQ_F_ARM_LTIMEOUT_BIT), | |
d7718a9d JA |
798 | }; |
799 | ||
800 | struct async_poll { | |
801 | struct io_poll_iocb poll; | |
807abcb0 | 802 | struct io_poll_iocb *double_poll; |
6b47ee6e PB |
803 | }; |
804 | ||
f237c30a | 805 | typedef void (*io_req_tw_func_t)(struct io_kiocb *req, bool *locked); |
5b0a6acc | 806 | |
7cbf1722 | 807 | struct io_task_work { |
5b0a6acc PB |
808 | union { |
809 | struct io_wq_work_node node; | |
810 | struct llist_node fallback_node; | |
811 | }; | |
812 | io_req_tw_func_t func; | |
7cbf1722 JA |
813 | }; |
814 | ||
992da01a PB |
815 | enum { |
816 | IORING_RSRC_FILE = 0, | |
817 | IORING_RSRC_BUFFER = 1, | |
818 | }; | |
819 | ||
09bb8394 JA |
820 | /* |
821 | * NOTE! Each of the iocb union members has the file pointer | |
822 | * as the first entry in their struct definition. So you can | |
823 | * access the file pointer through any of the sub-structs, | |
824 | * or directly as just 'ki_filp' in this struct. | |
825 | */ | |
2b188cc1 | 826 | struct io_kiocb { |
221c5eb2 | 827 | union { |
09bb8394 | 828 | struct file *file; |
9adbd45d | 829 | struct io_rw rw; |
221c5eb2 | 830 | struct io_poll_iocb poll; |
9d805892 | 831 | struct io_poll_update poll_update; |
8ed8d3c3 JA |
832 | struct io_accept accept; |
833 | struct io_sync sync; | |
fbf23849 | 834 | struct io_cancel cancel; |
b29472ee | 835 | struct io_timeout timeout; |
0bdf7a2d | 836 | struct io_timeout_rem timeout_rem; |
3fbb51c1 | 837 | struct io_connect connect; |
e47293fd | 838 | struct io_sr_msg sr_msg; |
15b71abe | 839 | struct io_open open; |
b5dba59e | 840 | struct io_close close; |
269bbe5f | 841 | struct io_rsrc_update rsrc_update; |
4840e418 | 842 | struct io_fadvise fadvise; |
c1ca757b | 843 | struct io_madvise madvise; |
3e4827b0 | 844 | struct io_epoll epoll; |
7d67af2c | 845 | struct io_splice splice; |
ddf0322d | 846 | struct io_provide_buf pbuf; |
1d9e1288 | 847 | struct io_statx statx; |
36f4fa68 | 848 | struct io_shutdown shutdown; |
80a261fd | 849 | struct io_rename rename; |
14a1143b | 850 | struct io_unlink unlink; |
e34a02dc | 851 | struct io_mkdir mkdir; |
7a8721f8 | 852 | struct io_symlink symlink; |
cf30da90 | 853 | struct io_hardlink hardlink; |
3ca405eb PB |
854 | /* use only after cleaning per-op data, see io_clean_op() */ |
855 | struct io_completion compl; | |
221c5eb2 | 856 | }; |
2b188cc1 | 857 | |
e8c2bc1f JA |
858 | /* opcode allocated if it needs to store data for async defer */ |
859 | void *async_data; | |
d625c6ee | 860 | u8 opcode; |
65a6543d XW |
861 | /* polled IO has completed */ |
862 | u8 iopoll_completed; | |
2b188cc1 | 863 | |
4f4eeba8 | 864 | u16 buf_index; |
9cf7c104 | 865 | u32 result; |
4f4eeba8 | 866 | |
010e8e6b PB |
867 | struct io_ring_ctx *ctx; |
868 | unsigned int flags; | |
abc54d63 | 869 | atomic_t refs; |
010e8e6b PB |
870 | struct task_struct *task; |
871 | u64 user_data; | |
d7718a9d | 872 | |
f2f87370 | 873 | struct io_kiocb *link; |
269bbe5f | 874 | struct percpu_ref *fixed_rsrc_refs; |
fcb323cc | 875 | |
b303fe2e | 876 | /* used with ctx->iopoll_list with reads/writes */ |
010e8e6b | 877 | struct list_head inflight_entry; |
5b0a6acc | 878 | struct io_task_work io_task_work; |
010e8e6b PB |
879 | /* for polled requests, i.e. IORING_OP_POLL_ADD and async armed poll */ |
880 | struct hlist_node hash_node; | |
881 | struct async_poll *apoll; | |
882 | struct io_wq_work work; | |
fe7e3257 | 883 | const struct cred *creds; |
c10d1f98 | 884 | |
eae071c9 PB |
885 | /* store used ubuf, so we can prevent reloading */ |
886 | struct io_mapped_ubuf *imu; | |
2b188cc1 | 887 | }; |
05589553 | 888 | |
13bf43f5 PB |
889 | struct io_tctx_node { |
890 | struct list_head ctx_node; | |
891 | struct task_struct *task; | |
13bf43f5 PB |
892 | struct io_ring_ctx *ctx; |
893 | }; | |
894 | ||
27dc8338 PB |
895 | struct io_defer_entry { |
896 | struct list_head list; | |
897 | struct io_kiocb *req; | |
9cf7c104 | 898 | u32 seq; |
2b188cc1 JA |
899 | }; |
900 | ||
d3656344 | 901 | struct io_op_def { |
d3656344 JA |
902 | /* needs req->file assigned */ |
903 | unsigned needs_file : 1; | |
d3656344 JA |
904 | /* hash wq insertion if file is a regular file */ |
905 | unsigned hash_reg_file : 1; | |
906 | /* unbound wq insertion if file is a non-regular file */ | |
907 | unsigned unbound_nonreg_file : 1; | |
66f4af93 JA |
908 | /* opcode is not supported by this kernel */ |
909 | unsigned not_supported : 1; | |
8a72758c JA |
910 | /* set if opcode supports polled "wait" */ |
911 | unsigned pollin : 1; | |
912 | unsigned pollout : 1; | |
bcda7baa JA |
913 | /* op supports buffer selection */ |
914 | unsigned buffer_select : 1; | |
26f0505a PB |
915 | /* do prep async if is going to be punted */ |
916 | unsigned needs_async_setup : 1; | |
27926b68 JA |
917 | /* should block plug */ |
918 | unsigned plug : 1; | |
e8c2bc1f JA |
919 | /* size of async data needed, if any */ |
920 | unsigned short async_size; | |
d3656344 JA |
921 | }; |
922 | ||
0918682b | 923 | static const struct io_op_def io_op_defs[] = { |
0463b6c5 PB |
924 | [IORING_OP_NOP] = {}, |
925 | [IORING_OP_READV] = { | |
d3656344 JA |
926 | .needs_file = 1, |
927 | .unbound_nonreg_file = 1, | |
8a72758c | 928 | .pollin = 1, |
4d954c25 | 929 | .buffer_select = 1, |
26f0505a | 930 | .needs_async_setup = 1, |
27926b68 | 931 | .plug = 1, |
e8c2bc1f | 932 | .async_size = sizeof(struct io_async_rw), |
d3656344 | 933 | }, |
0463b6c5 | 934 | [IORING_OP_WRITEV] = { |
d3656344 JA |
935 | .needs_file = 1, |
936 | .hash_reg_file = 1, | |
937 | .unbound_nonreg_file = 1, | |
8a72758c | 938 | .pollout = 1, |
26f0505a | 939 | .needs_async_setup = 1, |
27926b68 | 940 | .plug = 1, |
e8c2bc1f | 941 | .async_size = sizeof(struct io_async_rw), |
d3656344 | 942 | }, |
0463b6c5 | 943 | [IORING_OP_FSYNC] = { |
d3656344 JA |
944 | .needs_file = 1, |
945 | }, | |
0463b6c5 | 946 | [IORING_OP_READ_FIXED] = { |
d3656344 JA |
947 | .needs_file = 1, |
948 | .unbound_nonreg_file = 1, | |
8a72758c | 949 | .pollin = 1, |
27926b68 | 950 | .plug = 1, |
e8c2bc1f | 951 | .async_size = sizeof(struct io_async_rw), |
d3656344 | 952 | }, |
0463b6c5 | 953 | [IORING_OP_WRITE_FIXED] = { |
d3656344 JA |
954 | .needs_file = 1, |
955 | .hash_reg_file = 1, | |
956 | .unbound_nonreg_file = 1, | |
8a72758c | 957 | .pollout = 1, |
27926b68 | 958 | .plug = 1, |
e8c2bc1f | 959 | .async_size = sizeof(struct io_async_rw), |
d3656344 | 960 | }, |
0463b6c5 | 961 | [IORING_OP_POLL_ADD] = { |
d3656344 JA |
962 | .needs_file = 1, |
963 | .unbound_nonreg_file = 1, | |
964 | }, | |
0463b6c5 PB |
965 | [IORING_OP_POLL_REMOVE] = {}, |
966 | [IORING_OP_SYNC_FILE_RANGE] = { | |
d3656344 JA |
967 | .needs_file = 1, |
968 | }, | |
0463b6c5 | 969 | [IORING_OP_SENDMSG] = { |
d3656344 JA |
970 | .needs_file = 1, |
971 | .unbound_nonreg_file = 1, | |
8a72758c | 972 | .pollout = 1, |
26f0505a | 973 | .needs_async_setup = 1, |
e8c2bc1f | 974 | .async_size = sizeof(struct io_async_msghdr), |
d3656344 | 975 | }, |
0463b6c5 | 976 | [IORING_OP_RECVMSG] = { |
d3656344 JA |
977 | .needs_file = 1, |
978 | .unbound_nonreg_file = 1, | |
8a72758c | 979 | .pollin = 1, |
52de1fe1 | 980 | .buffer_select = 1, |
26f0505a | 981 | .needs_async_setup = 1, |
e8c2bc1f | 982 | .async_size = sizeof(struct io_async_msghdr), |
d3656344 | 983 | }, |
0463b6c5 | 984 | [IORING_OP_TIMEOUT] = { |
e8c2bc1f | 985 | .async_size = sizeof(struct io_timeout_data), |
d3656344 | 986 | }, |
9c8e11b3 PB |
987 | [IORING_OP_TIMEOUT_REMOVE] = { |
988 | /* used by timeout updates' prep() */ | |
9c8e11b3 | 989 | }, |
0463b6c5 | 990 | [IORING_OP_ACCEPT] = { |
d3656344 JA |
991 | .needs_file = 1, |
992 | .unbound_nonreg_file = 1, | |
8a72758c | 993 | .pollin = 1, |
d3656344 | 994 | }, |
0463b6c5 PB |
995 | [IORING_OP_ASYNC_CANCEL] = {}, |
996 | [IORING_OP_LINK_TIMEOUT] = { | |
e8c2bc1f | 997 | .async_size = sizeof(struct io_timeout_data), |
d3656344 | 998 | }, |
0463b6c5 | 999 | [IORING_OP_CONNECT] = { |
d3656344 JA |
1000 | .needs_file = 1, |
1001 | .unbound_nonreg_file = 1, | |
8a72758c | 1002 | .pollout = 1, |
26f0505a | 1003 | .needs_async_setup = 1, |
e8c2bc1f | 1004 | .async_size = sizeof(struct io_async_connect), |
d3656344 | 1005 | }, |
0463b6c5 | 1006 | [IORING_OP_FALLOCATE] = { |
d3656344 | 1007 | .needs_file = 1, |
d3656344 | 1008 | }, |
44526bed JA |
1009 | [IORING_OP_OPENAT] = {}, |
1010 | [IORING_OP_CLOSE] = {}, | |
1011 | [IORING_OP_FILES_UPDATE] = {}, | |
1012 | [IORING_OP_STATX] = {}, | |
0463b6c5 | 1013 | [IORING_OP_READ] = { |
3a6820f2 JA |
1014 | .needs_file = 1, |
1015 | .unbound_nonreg_file = 1, | |
8a72758c | 1016 | .pollin = 1, |
bcda7baa | 1017 | .buffer_select = 1, |
27926b68 | 1018 | .plug = 1, |
e8c2bc1f | 1019 | .async_size = sizeof(struct io_async_rw), |
3a6820f2 | 1020 | }, |
0463b6c5 | 1021 | [IORING_OP_WRITE] = { |
3a6820f2 | 1022 | .needs_file = 1, |
7b3188e7 | 1023 | .hash_reg_file = 1, |
3a6820f2 | 1024 | .unbound_nonreg_file = 1, |
8a72758c | 1025 | .pollout = 1, |
27926b68 | 1026 | .plug = 1, |
e8c2bc1f | 1027 | .async_size = sizeof(struct io_async_rw), |
3a6820f2 | 1028 | }, |
0463b6c5 | 1029 | [IORING_OP_FADVISE] = { |
4840e418 | 1030 | .needs_file = 1, |
c1ca757b | 1031 | }, |
44526bed | 1032 | [IORING_OP_MADVISE] = {}, |
0463b6c5 | 1033 | [IORING_OP_SEND] = { |
fddaface JA |
1034 | .needs_file = 1, |
1035 | .unbound_nonreg_file = 1, | |
8a72758c | 1036 | .pollout = 1, |
fddaface | 1037 | }, |
0463b6c5 | 1038 | [IORING_OP_RECV] = { |
fddaface JA |
1039 | .needs_file = 1, |
1040 | .unbound_nonreg_file = 1, | |
8a72758c | 1041 | .pollin = 1, |
bcda7baa | 1042 | .buffer_select = 1, |
fddaface | 1043 | }, |
0463b6c5 | 1044 | [IORING_OP_OPENAT2] = { |
cebdb986 | 1045 | }, |
3e4827b0 JA |
1046 | [IORING_OP_EPOLL_CTL] = { |
1047 | .unbound_nonreg_file = 1, | |
3e4827b0 | 1048 | }, |
7d67af2c PB |
1049 | [IORING_OP_SPLICE] = { |
1050 | .needs_file = 1, | |
1051 | .hash_reg_file = 1, | |
1052 | .unbound_nonreg_file = 1, | |
ddf0322d JA |
1053 | }, |
1054 | [IORING_OP_PROVIDE_BUFFERS] = {}, | |
067524e9 | 1055 | [IORING_OP_REMOVE_BUFFERS] = {}, |
f2a8d5c7 PB |
1056 | [IORING_OP_TEE] = { |
1057 | .needs_file = 1, | |
1058 | .hash_reg_file = 1, | |
1059 | .unbound_nonreg_file = 1, | |
1060 | }, | |
36f4fa68 JA |
1061 | [IORING_OP_SHUTDOWN] = { |
1062 | .needs_file = 1, | |
1063 | }, | |
44526bed JA |
1064 | [IORING_OP_RENAMEAT] = {}, |
1065 | [IORING_OP_UNLINKAT] = {}, | |
e34a02dc | 1066 | [IORING_OP_MKDIRAT] = {}, |
7a8721f8 | 1067 | [IORING_OP_SYMLINKAT] = {}, |
cf30da90 | 1068 | [IORING_OP_LINKAT] = {}, |
d3656344 JA |
1069 | }; |
1070 | ||
0756a869 PB |
1071 | /* requests with any of those set should undergo io_disarm_next() */ |
1072 | #define IO_DISARM_MASK (REQ_F_ARM_LTIMEOUT | REQ_F_LINK_TIMEOUT | REQ_F_FAIL) | |
1073 | ||
7a612350 | 1074 | static bool io_disarm_next(struct io_kiocb *req); |
eef51daa | 1075 | static void io_uring_del_tctx_node(unsigned long index); |
9936c7c2 PB |
1076 | static void io_uring_try_cancel_requests(struct io_ring_ctx *ctx, |
1077 | struct task_struct *task, | |
3dd0c97a | 1078 | bool cancel_all); |
78cc687b | 1079 | static void io_uring_cancel_generic(bool cancel_all, struct io_sq_data *sqd); |
1ffc5422 | 1080 | |
d4d19c19 PB |
1081 | static bool io_cqring_fill_event(struct io_ring_ctx *ctx, u64 user_data, |
1082 | long res, unsigned int cflags); | |
ec9c02ad | 1083 | static void io_put_req(struct io_kiocb *req); |
91c2f697 | 1084 | static void io_put_req_deferred(struct io_kiocb *req); |
c7dae4ba | 1085 | static void io_dismantle_req(struct io_kiocb *req); |
94ae5e77 | 1086 | static void io_queue_linked_timeout(struct io_kiocb *req); |
fdecb662 | 1087 | static int __io_register_rsrc_update(struct io_ring_ctx *ctx, unsigned type, |
c3bdad02 | 1088 | struct io_uring_rsrc_update2 *up, |
98f0b3b4 | 1089 | unsigned nr_args); |
68fb8979 | 1090 | static void io_clean_op(struct io_kiocb *req); |
ac177053 | 1091 | static struct file *io_file_get(struct io_ring_ctx *ctx, |
8371adf5 | 1092 | struct io_kiocb *req, int fd, bool fixed); |
c5eef2b9 | 1093 | static void __io_queue_sqe(struct io_kiocb *req); |
269bbe5f | 1094 | static void io_rsrc_put_work(struct work_struct *work); |
de0617e4 | 1095 | |
907d1df3 | 1096 | static void io_req_task_queue(struct io_kiocb *req); |
2a2758f2 | 1097 | static void io_submit_flush_completions(struct io_ring_ctx *ctx); |
179ae0d1 | 1098 | static int io_req_prep_async(struct io_kiocb *req); |
de0617e4 | 1099 | |
b9445598 PB |
1100 | static int io_install_fixed_file(struct io_kiocb *req, struct file *file, |
1101 | unsigned int issue_flags, u32 slot_index); | |
7df778be PB |
1102 | static int io_close_fixed(struct io_kiocb *req, unsigned int issue_flags); |
1103 | ||
f1042b6c | 1104 | static enum hrtimer_restart io_link_timeout_fn(struct hrtimer *timer); |
b9445598 | 1105 | |
2b188cc1 JA |
1106 | static struct kmem_cache *req_cachep; |
1107 | ||
0918682b | 1108 | static const struct file_operations io_uring_fops; |
2b188cc1 JA |
1109 | |
1110 | struct sock *io_uring_get_socket(struct file *file) | |
1111 | { | |
1112 | #if defined(CONFIG_UNIX) | |
1113 | if (file->f_op == &io_uring_fops) { | |
1114 | struct io_ring_ctx *ctx = file->private_data; | |
1115 | ||
1116 | return ctx->ring_sock->sk; | |
1117 | } | |
1118 | #endif | |
1119 | return NULL; | |
1120 | } | |
1121 | EXPORT_SYMBOL(io_uring_get_socket); | |
1122 | ||
f237c30a PB |
1123 | static inline void io_tw_lock(struct io_ring_ctx *ctx, bool *locked) |
1124 | { | |
1125 | if (!*locked) { | |
1126 | mutex_lock(&ctx->uring_lock); | |
1127 | *locked = true; | |
1128 | } | |
1129 | } | |
1130 | ||
f2f87370 PB |
1131 | #define io_for_each_link(pos, head) \ |
1132 | for (pos = (head); pos; pos = pos->link) | |
1133 | ||
21c843d5 PB |
1134 | /* |
1135 | * Shamelessly stolen from the mm implementation of page reference checking, | |
1136 | * see commit f958d7b528b1 for details. | |
1137 | */ | |
1138 | #define req_ref_zero_or_close_to_overflow(req) \ | |
1139 | ((unsigned int) atomic_read(&(req->refs)) + 127u <= 127u) | |
1140 | ||
1141 | static inline bool req_ref_inc_not_zero(struct io_kiocb *req) | |
1142 | { | |
20e60a38 | 1143 | WARN_ON_ONCE(!(req->flags & REQ_F_REFCOUNT)); |
21c843d5 PB |
1144 | return atomic_inc_not_zero(&req->refs); |
1145 | } | |
1146 | ||
21c843d5 PB |
1147 | static inline bool req_ref_put_and_test(struct io_kiocb *req) |
1148 | { | |
20e60a38 PB |
1149 | if (likely(!(req->flags & REQ_F_REFCOUNT))) |
1150 | return true; | |
1151 | ||
21c843d5 PB |
1152 | WARN_ON_ONCE(req_ref_zero_or_close_to_overflow(req)); |
1153 | return atomic_dec_and_test(&req->refs); | |
1154 | } | |
1155 | ||
1156 | static inline void req_ref_put(struct io_kiocb *req) | |
1157 | { | |
20e60a38 | 1158 | WARN_ON_ONCE(!(req->flags & REQ_F_REFCOUNT)); |
21c843d5 PB |
1159 | WARN_ON_ONCE(req_ref_put_and_test(req)); |
1160 | } | |
1161 | ||
1162 | static inline void req_ref_get(struct io_kiocb *req) | |
1163 | { | |
20e60a38 | 1164 | WARN_ON_ONCE(!(req->flags & REQ_F_REFCOUNT)); |
21c843d5 PB |
1165 | WARN_ON_ONCE(req_ref_zero_or_close_to_overflow(req)); |
1166 | atomic_inc(&req->refs); | |
1167 | } | |
1168 | ||
48dcd38d | 1169 | static inline void __io_req_set_refcount(struct io_kiocb *req, int nr) |
20e60a38 PB |
1170 | { |
1171 | if (!(req->flags & REQ_F_REFCOUNT)) { | |
1172 | req->flags |= REQ_F_REFCOUNT; | |
48dcd38d | 1173 | atomic_set(&req->refs, nr); |
20e60a38 PB |
1174 | } |
1175 | } | |
1176 | ||
48dcd38d PB |
1177 | static inline void io_req_set_refcount(struct io_kiocb *req) |
1178 | { | |
1179 | __io_req_set_refcount(req, 1); | |
1180 | } | |
1181 | ||
b895c9a6 | 1182 | static inline void io_req_set_rsrc_node(struct io_kiocb *req) |
36f72fe2 PB |
1183 | { |
1184 | struct io_ring_ctx *ctx = req->ctx; | |
1185 | ||
269bbe5f | 1186 | if (!req->fixed_rsrc_refs) { |
a7f0ed5a | 1187 | req->fixed_rsrc_refs = &ctx->rsrc_node->refs; |
269bbe5f | 1188 | percpu_ref_get(req->fixed_rsrc_refs); |
36f72fe2 PB |
1189 | } |
1190 | } | |
1191 | ||
f70865db PB |
1192 | static void io_refs_resurrect(struct percpu_ref *ref, struct completion *compl) |
1193 | { | |
1194 | bool got = percpu_ref_tryget(ref); | |
1195 | ||
1196 | /* already at zero, wait for ->release() */ | |
1197 | if (!got) | |
1198 | wait_for_completion(compl); | |
1199 | percpu_ref_resurrect(ref); | |
1200 | if (got) | |
1201 | percpu_ref_put(ref); | |
1202 | } | |
1203 | ||
3dd0c97a PB |
1204 | static bool io_match_task(struct io_kiocb *head, struct task_struct *task, |
1205 | bool cancel_all) | |
08d23634 PB |
1206 | { |
1207 | struct io_kiocb *req; | |
1208 | ||
68207680 | 1209 | if (task && head->task != task) |
08d23634 | 1210 | return false; |
3dd0c97a | 1211 | if (cancel_all) |
08d23634 PB |
1212 | return true; |
1213 | ||
1214 | io_for_each_link(req, head) { | |
b05a1bcd | 1215 | if (req->flags & REQ_F_INFLIGHT) |
02a13674 | 1216 | return true; |
08d23634 PB |
1217 | } |
1218 | return false; | |
1219 | } | |
1220 | ||
93d2bcd2 | 1221 | static inline void req_set_fail(struct io_kiocb *req) |
c40f6379 | 1222 | { |
93d2bcd2 | 1223 | req->flags |= REQ_F_FAIL; |
c40f6379 | 1224 | } |
4a38aed2 | 1225 | |
a8295b98 HX |
1226 | static inline void req_fail_link_node(struct io_kiocb *req, int res) |
1227 | { | |
1228 | req_set_fail(req); | |
1229 | req->result = res; | |
1230 | } | |
1231 | ||
2b188cc1 JA |
1232 | static void io_ring_ctx_ref_free(struct percpu_ref *ref) |
1233 | { | |
1234 | struct io_ring_ctx *ctx = container_of(ref, struct io_ring_ctx, refs); | |
1235 | ||
0f158b4c | 1236 | complete(&ctx->ref_comp); |
2b188cc1 JA |
1237 | } |
1238 | ||
8eb7e2d0 PB |
1239 | static inline bool io_is_timeout_noseq(struct io_kiocb *req) |
1240 | { | |
1241 | return !req->timeout.off; | |
1242 | } | |
1243 | ||
f56165e6 PB |
1244 | static void io_fallback_req_func(struct work_struct *work) |
1245 | { | |
1246 | struct io_ring_ctx *ctx = container_of(work, struct io_ring_ctx, | |
1247 | fallback_work.work); | |
1248 | struct llist_node *node = llist_del_all(&ctx->fallback_llist); | |
1249 | struct io_kiocb *req, *tmp; | |
f237c30a | 1250 | bool locked = false; |
f56165e6 PB |
1251 | |
1252 | percpu_ref_get(&ctx->refs); | |
1253 | llist_for_each_entry_safe(req, tmp, node, io_task_work.fallback_node) | |
f237c30a | 1254 | req->io_task_work.func(req, &locked); |
5636c00d | 1255 | |
f237c30a PB |
1256 | if (locked) { |
1257 | if (ctx->submit_state.compl_nr) | |
1258 | io_submit_flush_completions(ctx); | |
1259 | mutex_unlock(&ctx->uring_lock); | |
1260 | } | |
f56165e6 | 1261 | percpu_ref_put(&ctx->refs); |
f237c30a | 1262 | |
f56165e6 PB |
1263 | } |
1264 | ||
2b188cc1 JA |
1265 | static struct io_ring_ctx *io_ring_ctx_alloc(struct io_uring_params *p) |
1266 | { | |
1267 | struct io_ring_ctx *ctx; | |
78076bb6 | 1268 | int hash_bits; |
2b188cc1 JA |
1269 | |
1270 | ctx = kzalloc(sizeof(*ctx), GFP_KERNEL); | |
1271 | if (!ctx) | |
1272 | return NULL; | |
1273 | ||
78076bb6 JA |
1274 | /* |
1275 | * Use 5 bits less than the max cq entries, that should give us around | |
1276 | * 32 entries per hash list if totally full and uniformly spread. | |
1277 | */ | |
1278 | hash_bits = ilog2(p->cq_entries); | |
1279 | hash_bits -= 5; | |
1280 | if (hash_bits <= 0) | |
1281 | hash_bits = 1; | |
1282 | ctx->cancel_hash_bits = hash_bits; | |
1283 | ctx->cancel_hash = kmalloc((1U << hash_bits) * sizeof(struct hlist_head), | |
1284 | GFP_KERNEL); | |
1285 | if (!ctx->cancel_hash) | |
1286 | goto err; | |
1287 | __hash_init(ctx->cancel_hash, 1U << hash_bits); | |
1288 | ||
6224843d PB |
1289 | ctx->dummy_ubuf = kzalloc(sizeof(*ctx->dummy_ubuf), GFP_KERNEL); |
1290 | if (!ctx->dummy_ubuf) | |
1291 | goto err; | |
1292 | /* set invalid range, so io_import_fixed() fails meeting it */ | |
1293 | ctx->dummy_ubuf->ubuf = -1UL; | |
1294 | ||
21482896 | 1295 | if (percpu_ref_init(&ctx->refs, io_ring_ctx_ref_free, |
206aefde JA |
1296 | PERCPU_REF_ALLOW_REINIT, GFP_KERNEL)) |
1297 | goto err; | |
2b188cc1 JA |
1298 | |
1299 | ctx->flags = p->flags; | |
90554200 | 1300 | init_waitqueue_head(&ctx->sqo_sq_wait); |
69fb2131 | 1301 | INIT_LIST_HEAD(&ctx->sqd_list); |
311997b3 | 1302 | init_waitqueue_head(&ctx->poll_wait); |
1d7bb1d5 | 1303 | INIT_LIST_HEAD(&ctx->cq_overflow_list); |
0f158b4c | 1304 | init_completion(&ctx->ref_comp); |
9e15c3a0 | 1305 | xa_init_flags(&ctx->io_buffers, XA_FLAGS_ALLOC1); |
61cf9370 | 1306 | xa_init_flags(&ctx->personalities, XA_FLAGS_ALLOC1); |
2b188cc1 | 1307 | mutex_init(&ctx->uring_lock); |
311997b3 | 1308 | init_waitqueue_head(&ctx->cq_wait); |
2b188cc1 | 1309 | spin_lock_init(&ctx->completion_lock); |
89850fce | 1310 | spin_lock_init(&ctx->timeout_lock); |
540e32a0 | 1311 | INIT_LIST_HEAD(&ctx->iopoll_list); |
de0617e4 | 1312 | INIT_LIST_HEAD(&ctx->defer_list); |
5262f567 | 1313 | INIT_LIST_HEAD(&ctx->timeout_list); |
ef9dd637 | 1314 | INIT_LIST_HEAD(&ctx->ltimeout_list); |
d67d2263 BM |
1315 | spin_lock_init(&ctx->rsrc_ref_lock); |
1316 | INIT_LIST_HEAD(&ctx->rsrc_ref_list); | |
269bbe5f BM |
1317 | INIT_DELAYED_WORK(&ctx->rsrc_put_work, io_rsrc_put_work); |
1318 | init_llist_head(&ctx->rsrc_put_llist); | |
13bf43f5 | 1319 | INIT_LIST_HEAD(&ctx->tctx_list); |
cd0ca2e0 | 1320 | INIT_LIST_HEAD(&ctx->submit_state.free_list); |
d0acdee2 | 1321 | INIT_LIST_HEAD(&ctx->locked_free_list); |
9011bf9a | 1322 | INIT_DELAYED_WORK(&ctx->fallback_work, io_fallback_req_func); |
2b188cc1 | 1323 | return ctx; |
206aefde | 1324 | err: |
6224843d | 1325 | kfree(ctx->dummy_ubuf); |
78076bb6 | 1326 | kfree(ctx->cancel_hash); |
206aefde JA |
1327 | kfree(ctx); |
1328 | return NULL; | |
2b188cc1 JA |
1329 | } |
1330 | ||
8f6ed49a PB |
1331 | static void io_account_cq_overflow(struct io_ring_ctx *ctx) |
1332 | { | |
1333 | struct io_rings *r = ctx->rings; | |
1334 | ||
1335 | WRITE_ONCE(r->cq_overflow, READ_ONCE(r->cq_overflow) + 1); | |
1336 | ctx->cq_extra--; | |
1337 | } | |
1338 | ||
9cf7c104 | 1339 | static bool req_need_defer(struct io_kiocb *req, u32 seq) |
7adf4eaf | 1340 | { |
2bc9930e JA |
1341 | if (unlikely(req->flags & REQ_F_IO_DRAIN)) { |
1342 | struct io_ring_ctx *ctx = req->ctx; | |
a197f664 | 1343 | |
8f6ed49a | 1344 | return seq + READ_ONCE(ctx->cq_extra) != ctx->cached_cq_tail; |
2bc9930e | 1345 | } |
de0617e4 | 1346 | |
9d858b21 | 1347 | return false; |
de0617e4 JA |
1348 | } |
1349 | ||
c97d8a0f PB |
1350 | #define FFS_ASYNC_READ 0x1UL |
1351 | #define FFS_ASYNC_WRITE 0x2UL | |
1352 | #ifdef CONFIG_64BIT | |
1353 | #define FFS_ISREG 0x4UL | |
1354 | #else | |
1355 | #define FFS_ISREG 0x0UL | |
1356 | #endif | |
1357 | #define FFS_MASK ~(FFS_ASYNC_READ|FFS_ASYNC_WRITE|FFS_ISREG) | |
1358 | ||
1359 | static inline bool io_req_ffs_set(struct io_kiocb *req) | |
1360 | { | |
1361 | return IS_ENABLED(CONFIG_64BIT) && (req->flags & REQ_F_FIXED_FILE); | |
1362 | } | |
1363 | ||
ce3d5aae PB |
1364 | static void io_req_track_inflight(struct io_kiocb *req) |
1365 | { | |
ce3d5aae | 1366 | if (!(req->flags & REQ_F_INFLIGHT)) { |
ce3d5aae | 1367 | req->flags |= REQ_F_INFLIGHT; |
b303fe2e | 1368 | atomic_inc(¤t->io_uring->inflight_tracked); |
ce3d5aae PB |
1369 | } |
1370 | } | |
1371 | ||
906c6caa PB |
1372 | static inline void io_unprep_linked_timeout(struct io_kiocb *req) |
1373 | { | |
1374 | req->flags &= ~REQ_F_LINK_TIMEOUT; | |
1375 | } | |
1376 | ||
fd08e530 PB |
1377 | static struct io_kiocb *__io_prep_linked_timeout(struct io_kiocb *req) |
1378 | { | |
906c6caa PB |
1379 | if (WARN_ON_ONCE(!req->link)) |
1380 | return NULL; | |
1381 | ||
4d13d1a4 PB |
1382 | req->flags &= ~REQ_F_ARM_LTIMEOUT; |
1383 | req->flags |= REQ_F_LINK_TIMEOUT; | |
fd08e530 PB |
1384 | |
1385 | /* linked timeouts should have two refs once prep'ed */ | |
48dcd38d | 1386 | io_req_set_refcount(req); |
4d13d1a4 PB |
1387 | __io_req_set_refcount(req->link, 2); |
1388 | return req->link; | |
fd08e530 PB |
1389 | } |
1390 | ||
1391 | static inline struct io_kiocb *io_prep_linked_timeout(struct io_kiocb *req) | |
1392 | { | |
4d13d1a4 | 1393 | if (likely(!(req->flags & REQ_F_ARM_LTIMEOUT))) |
fd08e530 PB |
1394 | return NULL; |
1395 | return __io_prep_linked_timeout(req); | |
1396 | } | |
1397 | ||
1e6fa521 JA |
1398 | static void io_prep_async_work(struct io_kiocb *req) |
1399 | { | |
1400 | const struct io_op_def *def = &io_op_defs[req->opcode]; | |
1e6fa521 JA |
1401 | struct io_ring_ctx *ctx = req->ctx; |
1402 | ||
b8e64b53 PB |
1403 | if (!(req->flags & REQ_F_CREDS)) { |
1404 | req->flags |= REQ_F_CREDS; | |
c10d1f98 | 1405 | req->creds = get_current_cred(); |
b8e64b53 | 1406 | } |
003e8dcc | 1407 | |
e1d675df PB |
1408 | req->work.list.next = NULL; |
1409 | req->work.flags = 0; | |
feaadc4f PB |
1410 | if (req->flags & REQ_F_FORCE_ASYNC) |
1411 | req->work.flags |= IO_WQ_WORK_CONCURRENT; | |
1412 | ||
1e6fa521 JA |
1413 | if (req->flags & REQ_F_ISREG) { |
1414 | if (def->hash_reg_file || (ctx->flags & IORING_SETUP_IOPOLL)) | |
1415 | io_wq_hash_work(&req->work, file_inode(req->file)); | |
4b982bd0 | 1416 | } else if (!req->file || !S_ISBLK(file_inode(req->file)->i_mode)) { |
1e6fa521 JA |
1417 | if (def->unbound_nonreg_file) |
1418 | req->work.flags |= IO_WQ_WORK_UNBOUND; | |
1419 | } | |
e1d675df PB |
1420 | |
1421 | switch (req->opcode) { | |
1422 | case IORING_OP_SPLICE: | |
1423 | case IORING_OP_TEE: | |
e1d675df PB |
1424 | if (!S_ISREG(file_inode(req->splice.file_in)->i_mode)) |
1425 | req->work.flags |= IO_WQ_WORK_UNBOUND; | |
1426 | break; | |
1427 | } | |
561fb04a | 1428 | } |
cccf0ee8 | 1429 | |
cbdcb435 | 1430 | static void io_prep_async_link(struct io_kiocb *req) |
561fb04a | 1431 | { |
cbdcb435 | 1432 | struct io_kiocb *cur; |
54a91f3b | 1433 | |
44eff40a PB |
1434 | if (req->flags & REQ_F_LINK_TIMEOUT) { |
1435 | struct io_ring_ctx *ctx = req->ctx; | |
1436 | ||
79ebeaee | 1437 | spin_lock(&ctx->completion_lock); |
44eff40a PB |
1438 | io_for_each_link(cur, req) |
1439 | io_prep_async_work(cur); | |
79ebeaee | 1440 | spin_unlock(&ctx->completion_lock); |
44eff40a PB |
1441 | } else { |
1442 | io_for_each_link(cur, req) | |
1443 | io_prep_async_work(cur); | |
1444 | } | |
561fb04a JA |
1445 | } |
1446 | ||
f237c30a | 1447 | static void io_queue_async_work(struct io_kiocb *req, bool *locked) |
561fb04a | 1448 | { |
a197f664 | 1449 | struct io_ring_ctx *ctx = req->ctx; |
cbdcb435 | 1450 | struct io_kiocb *link = io_prep_linked_timeout(req); |
5aa75ed5 | 1451 | struct io_uring_task *tctx = req->task->io_uring; |
561fb04a | 1452 | |
f237c30a PB |
1453 | /* must not take the lock, NULL it as a precaution */ |
1454 | locked = NULL; | |
1455 | ||
3bfe6106 JA |
1456 | BUG_ON(!tctx); |
1457 | BUG_ON(!tctx->io_wq); | |
561fb04a | 1458 | |
cbdcb435 PB |
1459 | /* init ->work of the whole link before punting */ |
1460 | io_prep_async_link(req); | |
991468dc JA |
1461 | |
1462 | /* | |
1463 | * Not expected to happen, but if we do have a bug where this _can_ | |
1464 | * happen, catch it here and ensure the request is marked as | |
1465 | * canceled. That will make io-wq go through the usual work cancel | |
1466 | * procedure rather than attempt to run this request (or create a new | |
1467 | * worker for it). | |
1468 | */ | |
1469 | if (WARN_ON_ONCE(!same_thread_group(req->task, current))) | |
1470 | req->work.flags |= IO_WQ_WORK_CANCEL; | |
1471 | ||
d07f1e8a PB |
1472 | trace_io_uring_queue_async_work(ctx, io_wq_is_hashed(&req->work), req, |
1473 | &req->work, req->flags); | |
ebf93667 | 1474 | io_wq_enqueue(tctx->io_wq, &req->work); |
7271ef3a JA |
1475 | if (link) |
1476 | io_queue_linked_timeout(link); | |
cbdcb435 PB |
1477 | } |
1478 | ||
1ee4160c | 1479 | static void io_kill_timeout(struct io_kiocb *req, int status) |
8c855885 | 1480 | __must_hold(&req->ctx->completion_lock) |
89850fce | 1481 | __must_hold(&req->ctx->timeout_lock) |
5262f567 | 1482 | { |
e8c2bc1f | 1483 | struct io_timeout_data *io = req->async_data; |
5262f567 | 1484 | |
fd9c7bc5 | 1485 | if (hrtimer_try_to_cancel(&io->timer) != -1) { |
2ae2eb9d PB |
1486 | if (status) |
1487 | req_set_fail(req); | |
01cec8c1 PB |
1488 | atomic_set(&req->ctx->cq_timeouts, |
1489 | atomic_read(&req->ctx->cq_timeouts) + 1); | |
135fcde8 | 1490 | list_del_init(&req->timeout.list); |
d4d19c19 | 1491 | io_cqring_fill_event(req->ctx, req->user_data, status, 0); |
91c2f697 | 1492 | io_put_req_deferred(req); |
5262f567 JA |
1493 | } |
1494 | } | |
1495 | ||
441b8a78 | 1496 | static void io_queue_deferred(struct io_ring_ctx *ctx) |
de0617e4 | 1497 | { |
441b8a78 | 1498 | while (!list_empty(&ctx->defer_list)) { |
27dc8338 PB |
1499 | struct io_defer_entry *de = list_first_entry(&ctx->defer_list, |
1500 | struct io_defer_entry, list); | |
de0617e4 | 1501 | |
9cf7c104 | 1502 | if (req_need_defer(de->req, de->seq)) |
04518945 | 1503 | break; |
27dc8338 | 1504 | list_del_init(&de->list); |
907d1df3 | 1505 | io_req_task_queue(de->req); |
27dc8338 | 1506 | kfree(de); |
441b8a78 | 1507 | } |
04518945 PB |
1508 | } |
1509 | ||
360428f8 | 1510 | static void io_flush_timeouts(struct io_ring_ctx *ctx) |
89850fce | 1511 | __must_hold(&ctx->completion_lock) |
de0617e4 | 1512 | { |
441b8a78 | 1513 | u32 seq = ctx->cached_cq_tail - atomic_read(&ctx->cq_timeouts); |
f010505b | 1514 | |
79ebeaee | 1515 | spin_lock_irq(&ctx->timeout_lock); |
f18ee4cf | 1516 | while (!list_empty(&ctx->timeout_list)) { |
f010505b | 1517 | u32 events_needed, events_got; |
360428f8 | 1518 | struct io_kiocb *req = list_first_entry(&ctx->timeout_list, |
135fcde8 | 1519 | struct io_kiocb, timeout.list); |
de0617e4 | 1520 | |
8eb7e2d0 | 1521 | if (io_is_timeout_noseq(req)) |
360428f8 | 1522 | break; |
f010505b MDG |
1523 | |
1524 | /* | |
1525 | * Since seq can easily wrap around over time, subtract | |
1526 | * the last seq at which timeouts were flushed before comparing. | |
1527 | * Assuming not more than 2^31-1 events have happened since, | |
1528 | * these subtractions won't have wrapped, so we can check if | |
1529 | * target is in [last_seq, current_seq] by comparing the two. | |
1530 | */ | |
1531 | events_needed = req->timeout.target_seq - ctx->cq_last_tm_flush; | |
1532 | events_got = seq - ctx->cq_last_tm_flush; | |
1533 | if (events_got < events_needed) | |
360428f8 | 1534 | break; |
bfe68a22 | 1535 | |
135fcde8 | 1536 | list_del_init(&req->timeout.list); |
1ee4160c | 1537 | io_kill_timeout(req, 0); |
f18ee4cf | 1538 | } |
f010505b | 1539 | ctx->cq_last_tm_flush = seq; |
79ebeaee | 1540 | spin_unlock_irq(&ctx->timeout_lock); |
360428f8 | 1541 | } |
5262f567 | 1542 | |
2335f6f5 | 1543 | static void __io_commit_cqring_flush(struct io_ring_ctx *ctx) |
360428f8 | 1544 | { |
2335f6f5 PB |
1545 | if (ctx->off_timeout_used) |
1546 | io_flush_timeouts(ctx); | |
1547 | if (ctx->drain_active) | |
1548 | io_queue_deferred(ctx); | |
1549 | } | |
1550 | ||
1551 | static inline void io_commit_cqring(struct io_ring_ctx *ctx) | |
1552 | { | |
1553 | if (unlikely(ctx->off_timeout_used || ctx->drain_active)) | |
1554 | __io_commit_cqring_flush(ctx); | |
ec30e04b PB |
1555 | /* order cqe stores with ring update */ |
1556 | smp_store_release(&ctx->rings->cq.tail, ctx->cached_cq_tail); | |
de0617e4 JA |
1557 | } |
1558 | ||
90554200 JA |
1559 | static inline bool io_sqring_full(struct io_ring_ctx *ctx) |
1560 | { | |
1561 | struct io_rings *r = ctx->rings; | |
1562 | ||
a566c556 | 1563 | return READ_ONCE(r->sq.tail) - ctx->cached_sq_head == ctx->sq_entries; |
90554200 JA |
1564 | } |
1565 | ||
888aae2e PB |
1566 | static inline unsigned int __io_cqring_events(struct io_ring_ctx *ctx) |
1567 | { | |
1568 | return ctx->cached_cq_tail - READ_ONCE(ctx->rings->cq.head); | |
1569 | } | |
1570 | ||
d068b506 | 1571 | static inline struct io_uring_cqe *io_get_cqe(struct io_ring_ctx *ctx) |
2b188cc1 | 1572 | { |
75b28aff | 1573 | struct io_rings *rings = ctx->rings; |
ea5ab3b5 | 1574 | unsigned tail, mask = ctx->cq_entries - 1; |
2b188cc1 | 1575 | |
115e12e5 SB |
1576 | /* |
1577 | * writes to the cq entry need to come after reading head; the | |
1578 | * control dependency is enough as we're using WRITE_ONCE to | |
1579 | * fill the cq entry | |
1580 | */ | |
a566c556 | 1581 | if (__io_cqring_events(ctx) == ctx->cq_entries) |
2b188cc1 JA |
1582 | return NULL; |
1583 | ||
888aae2e | 1584 | tail = ctx->cached_cq_tail++; |
ea5ab3b5 | 1585 | return &rings->cqes[tail & mask]; |
2b188cc1 JA |
1586 | } |
1587 | ||
f2842ab5 JA |
1588 | static inline bool io_should_trigger_evfd(struct io_ring_ctx *ctx) |
1589 | { | |
44c769de | 1590 | if (likely(!ctx->cq_ev_fd)) |
f0b493e6 | 1591 | return false; |
7e55a19c SG |
1592 | if (READ_ONCE(ctx->rings->cq_flags) & IORING_CQ_EVENTFD_DISABLED) |
1593 | return false; | |
44c769de | 1594 | return !ctx->eventfd_async || io_wq_current_is_worker(); |
f2842ab5 JA |
1595 | } |
1596 | ||
2c5d763c JA |
1597 | /* |
1598 | * This should only get called when at least one event has been posted. | |
1599 | * Some applications rely on the eventfd notification count only changing | |
1600 | * IFF a new CQE has been added to the CQ ring. There's no depedency on | |
1601 | * 1:1 relationship between how many times this function is called (and | |
1602 | * hence the eventfd count) and number of CQEs posted to the CQ ring. | |
1603 | */ | |
b41e9852 | 1604 | static void io_cqring_ev_posted(struct io_ring_ctx *ctx) |
1d7bb1d5 | 1605 | { |
5fd46178 JA |
1606 | /* |
1607 | * wake_up_all() may seem excessive, but io_wake_function() and | |
1608 | * io_should_wake() handle the termination of the loop and only | |
1609 | * wake as many waiters as we need to. | |
1610 | */ | |
1611 | if (wq_has_sleeper(&ctx->cq_wait)) | |
1612 | wake_up_all(&ctx->cq_wait); | |
534ca6d6 JA |
1613 | if (ctx->sq_data && waitqueue_active(&ctx->sq_data->wait)) |
1614 | wake_up(&ctx->sq_data->wait); | |
b41e9852 | 1615 | if (io_should_trigger_evfd(ctx)) |
1d7bb1d5 | 1616 | eventfd_signal(ctx->cq_ev_fd, 1); |
311997b3 PB |
1617 | if (waitqueue_active(&ctx->poll_wait)) { |
1618 | wake_up_interruptible(&ctx->poll_wait); | |
4aa84f2f PB |
1619 | kill_fasync(&ctx->cq_fasync, SIGIO, POLL_IN); |
1620 | } | |
1d7bb1d5 JA |
1621 | } |
1622 | ||
80c18e4a PB |
1623 | static void io_cqring_ev_posted_iopoll(struct io_ring_ctx *ctx) |
1624 | { | |
c57a91fb PB |
1625 | /* see waitqueue_active() comment */ |
1626 | smp_mb(); | |
1627 | ||
80c18e4a | 1628 | if (ctx->flags & IORING_SETUP_SQPOLL) { |
c57a91fb | 1629 | if (waitqueue_active(&ctx->cq_wait)) |
5fd46178 | 1630 | wake_up_all(&ctx->cq_wait); |
80c18e4a PB |
1631 | } |
1632 | if (io_should_trigger_evfd(ctx)) | |
1633 | eventfd_signal(ctx->cq_ev_fd, 1); | |
311997b3 PB |
1634 | if (waitqueue_active(&ctx->poll_wait)) { |
1635 | wake_up_interruptible(&ctx->poll_wait); | |
4aa84f2f PB |
1636 | kill_fasync(&ctx->cq_fasync, SIGIO, POLL_IN); |
1637 | } | |
80c18e4a PB |
1638 | } |
1639 | ||
c4a2ed72 | 1640 | /* Returns true if there are no backlogged entries after the flush */ |
6c2450ae | 1641 | static bool __io_cqring_overflow_flush(struct io_ring_ctx *ctx, bool force) |
1d7bb1d5 | 1642 | { |
b18032bb | 1643 | bool all_flushed, posted; |
1d7bb1d5 | 1644 | |
a566c556 | 1645 | if (!force && __io_cqring_events(ctx) == ctx->cq_entries) |
e23de15f | 1646 | return false; |
1d7bb1d5 | 1647 | |
b18032bb | 1648 | posted = false; |
79ebeaee | 1649 | spin_lock(&ctx->completion_lock); |
6c2450ae | 1650 | while (!list_empty(&ctx->cq_overflow_list)) { |
d068b506 | 1651 | struct io_uring_cqe *cqe = io_get_cqe(ctx); |
6c2450ae | 1652 | struct io_overflow_cqe *ocqe; |
e6c8aa9a | 1653 | |
1d7bb1d5 JA |
1654 | if (!cqe && !force) |
1655 | break; | |
6c2450ae PB |
1656 | ocqe = list_first_entry(&ctx->cq_overflow_list, |
1657 | struct io_overflow_cqe, list); | |
1658 | if (cqe) | |
1659 | memcpy(cqe, &ocqe->cqe, sizeof(*cqe)); | |
1660 | else | |
8f6ed49a PB |
1661 | io_account_cq_overflow(ctx); |
1662 | ||
b18032bb | 1663 | posted = true; |
6c2450ae PB |
1664 | list_del(&ocqe->list); |
1665 | kfree(ocqe); | |
1d7bb1d5 JA |
1666 | } |
1667 | ||
09e88404 PB |
1668 | all_flushed = list_empty(&ctx->cq_overflow_list); |
1669 | if (all_flushed) { | |
5ed7a37d | 1670 | clear_bit(0, &ctx->check_cq_overflow); |
20c0b380 NA |
1671 | WRITE_ONCE(ctx->rings->sq_flags, |
1672 | ctx->rings->sq_flags & ~IORING_SQ_CQ_OVERFLOW); | |
09e88404 | 1673 | } |
46930143 | 1674 | |
b18032bb JA |
1675 | if (posted) |
1676 | io_commit_cqring(ctx); | |
79ebeaee | 1677 | spin_unlock(&ctx->completion_lock); |
b18032bb JA |
1678 | if (posted) |
1679 | io_cqring_ev_posted(ctx); | |
09e88404 | 1680 | return all_flushed; |
1d7bb1d5 JA |
1681 | } |
1682 | ||
90f67366 | 1683 | static bool io_cqring_overflow_flush(struct io_ring_ctx *ctx) |
6c503150 | 1684 | { |
ca0a2651 JA |
1685 | bool ret = true; |
1686 | ||
5ed7a37d | 1687 | if (test_bit(0, &ctx->check_cq_overflow)) { |
6c503150 PB |
1688 | /* iopoll syncs against uring_lock, not completion_lock */ |
1689 | if (ctx->flags & IORING_SETUP_IOPOLL) | |
1690 | mutex_lock(&ctx->uring_lock); | |
90f67366 | 1691 | ret = __io_cqring_overflow_flush(ctx, false); |
6c503150 PB |
1692 | if (ctx->flags & IORING_SETUP_IOPOLL) |
1693 | mutex_unlock(&ctx->uring_lock); | |
1694 | } | |
ca0a2651 JA |
1695 | |
1696 | return ret; | |
6c503150 PB |
1697 | } |
1698 | ||
6a290a14 PB |
1699 | /* must to be called somewhat shortly after putting a request */ |
1700 | static inline void io_put_task(struct task_struct *task, int nr) | |
1701 | { | |
1702 | struct io_uring_task *tctx = task->io_uring; | |
1703 | ||
e98e49b2 PB |
1704 | if (likely(task == current)) { |
1705 | tctx->cached_refs += nr; | |
1706 | } else { | |
1707 | percpu_counter_sub(&tctx->inflight, nr); | |
1708 | if (unlikely(atomic_read(&tctx->in_idle))) | |
1709 | wake_up(&tctx->wait); | |
1710 | put_task_struct_many(task, nr); | |
1711 | } | |
6a290a14 PB |
1712 | } |
1713 | ||
9a10867a PB |
1714 | static void io_task_refs_refill(struct io_uring_task *tctx) |
1715 | { | |
1716 | unsigned int refill = -tctx->cached_refs + IO_TCTX_REFS_CACHE_NR; | |
1717 | ||
1718 | percpu_counter_add(&tctx->inflight, refill); | |
1719 | refcount_add(refill, ¤t->usage); | |
1720 | tctx->cached_refs += refill; | |
1721 | } | |
1722 | ||
1723 | static inline void io_get_task_refs(int nr) | |
1724 | { | |
1725 | struct io_uring_task *tctx = current->io_uring; | |
1726 | ||
1727 | tctx->cached_refs -= nr; | |
1728 | if (unlikely(tctx->cached_refs < 0)) | |
1729 | io_task_refs_refill(tctx); | |
1730 | } | |
1731 | ||
d4d19c19 PB |
1732 | static bool io_cqring_event_overflow(struct io_ring_ctx *ctx, u64 user_data, |
1733 | long res, unsigned int cflags) | |
2b188cc1 | 1734 | { |
cce4b8b0 | 1735 | struct io_overflow_cqe *ocqe; |
2b188cc1 | 1736 | |
cce4b8b0 PB |
1737 | ocqe = kmalloc(sizeof(*ocqe), GFP_ATOMIC | __GFP_ACCOUNT); |
1738 | if (!ocqe) { | |
1739 | /* | |
1740 | * If we're in ring overflow flush mode, or in task cancel mode, | |
1741 | * or cannot allocate an overflow entry, then we need to drop it | |
1742 | * on the floor. | |
1743 | */ | |
8f6ed49a | 1744 | io_account_cq_overflow(ctx); |
cce4b8b0 | 1745 | return false; |
2b188cc1 | 1746 | } |
cce4b8b0 | 1747 | if (list_empty(&ctx->cq_overflow_list)) { |
5ed7a37d | 1748 | set_bit(0, &ctx->check_cq_overflow); |
20c0b380 NA |
1749 | WRITE_ONCE(ctx->rings->sq_flags, |
1750 | ctx->rings->sq_flags | IORING_SQ_CQ_OVERFLOW); | |
1751 | ||
cce4b8b0 | 1752 | } |
d4d19c19 | 1753 | ocqe->cqe.user_data = user_data; |
cce4b8b0 PB |
1754 | ocqe->cqe.res = res; |
1755 | ocqe->cqe.flags = cflags; | |
1756 | list_add_tail(&ocqe->list, &ctx->cq_overflow_list); | |
1757 | return true; | |
2b188cc1 JA |
1758 | } |
1759 | ||
d4d19c19 PB |
1760 | static inline bool __io_cqring_fill_event(struct io_ring_ctx *ctx, u64 user_data, |
1761 | long res, unsigned int cflags) | |
2b188cc1 JA |
1762 | { |
1763 | struct io_uring_cqe *cqe; | |
1764 | ||
d4d19c19 | 1765 | trace_io_uring_complete(ctx, user_data, res, cflags); |
51c3ff62 | 1766 | |
2b188cc1 JA |
1767 | /* |
1768 | * If we can't get a cq entry, userspace overflowed the | |
1769 | * submission (by quite a lot). Increment the overflow count in | |
1770 | * the ring. | |
1771 | */ | |
d068b506 | 1772 | cqe = io_get_cqe(ctx); |
1d7bb1d5 | 1773 | if (likely(cqe)) { |
d4d19c19 | 1774 | WRITE_ONCE(cqe->user_data, user_data); |
2b188cc1 | 1775 | WRITE_ONCE(cqe->res, res); |
bcda7baa | 1776 | WRITE_ONCE(cqe->flags, cflags); |
8d13326e | 1777 | return true; |
2b188cc1 | 1778 | } |
d4d19c19 | 1779 | return io_cqring_event_overflow(ctx, user_data, res, cflags); |
2b188cc1 JA |
1780 | } |
1781 | ||
8d13326e | 1782 | /* not as hot to bloat with inlining */ |
d4d19c19 PB |
1783 | static noinline bool io_cqring_fill_event(struct io_ring_ctx *ctx, u64 user_data, |
1784 | long res, unsigned int cflags) | |
bcda7baa | 1785 | { |
d4d19c19 | 1786 | return __io_cqring_fill_event(ctx, user_data, res, cflags); |
bcda7baa JA |
1787 | } |
1788 | ||
7a612350 PB |
1789 | static void io_req_complete_post(struct io_kiocb *req, long res, |
1790 | unsigned int cflags) | |
2b188cc1 | 1791 | { |
78e19bbe | 1792 | struct io_ring_ctx *ctx = req->ctx; |
2b188cc1 | 1793 | |
79ebeaee | 1794 | spin_lock(&ctx->completion_lock); |
d4d19c19 | 1795 | __io_cqring_fill_event(ctx, req->user_data, res, cflags); |
c7dae4ba JA |
1796 | /* |
1797 | * If we're the last reference to this request, add to our locked | |
1798 | * free_list cache. | |
1799 | */ | |
de9b4cca | 1800 | if (req_ref_put_and_test(req)) { |
7a612350 | 1801 | if (req->flags & (REQ_F_LINK | REQ_F_HARDLINK)) { |
0756a869 | 1802 | if (req->flags & IO_DISARM_MASK) |
7a612350 PB |
1803 | io_disarm_next(req); |
1804 | if (req->link) { | |
1805 | io_req_task_queue(req->link); | |
1806 | req->link = NULL; | |
1807 | } | |
1808 | } | |
c7dae4ba JA |
1809 | io_dismantle_req(req); |
1810 | io_put_task(req->task, 1); | |
bb943b82 | 1811 | list_add(&req->inflight_entry, &ctx->locked_free_list); |
d0acdee2 | 1812 | ctx->locked_free_nr++; |
180f829f PB |
1813 | } else { |
1814 | if (!percpu_ref_tryget(&ctx->refs)) | |
1815 | req = NULL; | |
1816 | } | |
7a612350 | 1817 | io_commit_cqring(ctx); |
79ebeaee | 1818 | spin_unlock(&ctx->completion_lock); |
7a612350 | 1819 | |
180f829f PB |
1820 | if (req) { |
1821 | io_cqring_ev_posted(ctx); | |
c7dae4ba | 1822 | percpu_ref_put(&ctx->refs); |
180f829f | 1823 | } |
229a7b63 JA |
1824 | } |
1825 | ||
4e3d9ff9 JA |
1826 | static inline bool io_req_needs_clean(struct io_kiocb *req) |
1827 | { | |
c854357b | 1828 | return req->flags & IO_REQ_CLEAN_FLAGS; |
4e3d9ff9 JA |
1829 | } |
1830 | ||
a38d68db | 1831 | static void io_req_complete_state(struct io_kiocb *req, long res, |
889fca73 | 1832 | unsigned int cflags) |
229a7b63 | 1833 | { |
4e3d9ff9 | 1834 | if (io_req_needs_clean(req)) |
68fb8979 | 1835 | io_clean_op(req); |
a38d68db PB |
1836 | req->result = res; |
1837 | req->compl.cflags = cflags; | |
e342c807 | 1838 | req->flags |= REQ_F_COMPLETE_INLINE; |
e1e16097 JA |
1839 | } |
1840 | ||
889fca73 PB |
1841 | static inline void __io_req_complete(struct io_kiocb *req, unsigned issue_flags, |
1842 | long res, unsigned cflags) | |
bcda7baa | 1843 | { |
889fca73 PB |
1844 | if (issue_flags & IO_URING_F_COMPLETE_DEFER) |
1845 | io_req_complete_state(req, res, cflags); | |
a38d68db | 1846 | else |
c7dae4ba | 1847 | io_req_complete_post(req, res, cflags); |
bcda7baa JA |
1848 | } |
1849 | ||
a38d68db | 1850 | static inline void io_req_complete(struct io_kiocb *req, long res) |
0ddf92e8 | 1851 | { |
889fca73 | 1852 | __io_req_complete(req, 0, res, 0); |
0ddf92e8 JA |
1853 | } |
1854 | ||
f41db273 PB |
1855 | static void io_req_complete_failed(struct io_kiocb *req, long res) |
1856 | { | |
93d2bcd2 | 1857 | req_set_fail(req); |
f41db273 PB |
1858 | io_req_complete_post(req, res, 0); |
1859 | } | |
1860 | ||
c6d3d9cb PB |
1861 | static void io_req_complete_fail_submit(struct io_kiocb *req) |
1862 | { | |
1863 | /* | |
1864 | * We don't submit, fail them all, for that replace hardlinks with | |
1865 | * normal links. Extra REQ_F_LINK is tolerated. | |
1866 | */ | |
1867 | req->flags &= ~REQ_F_HARDLINK; | |
1868 | req->flags |= REQ_F_LINK; | |
1869 | io_req_complete_failed(req, req->result); | |
1870 | } | |
1871 | ||
864ea921 PB |
1872 | /* |
1873 | * Don't initialise the fields below on every allocation, but do that in | |
1874 | * advance and keep them valid across allocations. | |
1875 | */ | |
1876 | static void io_preinit_req(struct io_kiocb *req, struct io_ring_ctx *ctx) | |
1877 | { | |
1878 | req->ctx = ctx; | |
1879 | req->link = NULL; | |
1880 | req->async_data = NULL; | |
1881 | /* not necessary, but safer to zero */ | |
1882 | req->result = 0; | |
1883 | } | |
1884 | ||
dac7a098 | 1885 | static void io_flush_cached_locked_reqs(struct io_ring_ctx *ctx, |
cd0ca2e0 | 1886 | struct io_submit_state *state) |
dac7a098 | 1887 | { |
79ebeaee | 1888 | spin_lock(&ctx->completion_lock); |
cd0ca2e0 | 1889 | list_splice_init(&ctx->locked_free_list, &state->free_list); |
d0acdee2 | 1890 | ctx->locked_free_nr = 0; |
79ebeaee | 1891 | spin_unlock(&ctx->completion_lock); |
dac7a098 PB |
1892 | } |
1893 | ||
dd78f492 | 1894 | /* Returns true IFF there are requests in the cache */ |
c7dae4ba | 1895 | static bool io_flush_cached_reqs(struct io_ring_ctx *ctx) |
0ddf92e8 | 1896 | { |
c7dae4ba | 1897 | struct io_submit_state *state = &ctx->submit_state; |
dd78f492 | 1898 | int nr; |
0ddf92e8 | 1899 | |
c7dae4ba JA |
1900 | /* |
1901 | * If we have more than a batch's worth of requests in our IRQ side | |
1902 | * locked cache, grab the lock and move them over to our submission | |
1903 | * side cache. | |
1904 | */ | |
d0acdee2 | 1905 | if (READ_ONCE(ctx->locked_free_nr) > IO_COMPL_BATCH) |
cd0ca2e0 | 1906 | io_flush_cached_locked_reqs(ctx, state); |
0ddf92e8 | 1907 | |
dd78f492 | 1908 | nr = state->free_reqs; |
cd0ca2e0 PB |
1909 | while (!list_empty(&state->free_list)) { |
1910 | struct io_kiocb *req = list_first_entry(&state->free_list, | |
bb943b82 | 1911 | struct io_kiocb, inflight_entry); |
dd78f492 | 1912 | |
bb943b82 | 1913 | list_del(&req->inflight_entry); |
dd78f492 PB |
1914 | state->reqs[nr++] = req; |
1915 | if (nr == ARRAY_SIZE(state->reqs)) | |
e5d1bc0a | 1916 | break; |
1b4c351f JA |
1917 | } |
1918 | ||
dd78f492 PB |
1919 | state->free_reqs = nr; |
1920 | return nr != 0; | |
0ddf92e8 JA |
1921 | } |
1922 | ||
5d5901a3 PB |
1923 | /* |
1924 | * A request might get retired back into the request caches even before opcode | |
1925 | * handlers and io_issue_sqe() are done with it, e.g. inline completion path. | |
1926 | * Because of that, io_alloc_req() should be called only under ->uring_lock | |
1927 | * and with extra caution to not get a request that is still worked on. | |
1928 | */ | |
e5d1bc0a | 1929 | static struct io_kiocb *io_alloc_req(struct io_ring_ctx *ctx) |
5d5901a3 | 1930 | __must_hold(&ctx->uring_lock) |
2b188cc1 | 1931 | { |
e5d1bc0a | 1932 | struct io_submit_state *state = &ctx->submit_state; |
864ea921 PB |
1933 | gfp_t gfp = GFP_KERNEL | __GFP_NOWARN; |
1934 | int ret, i; | |
e5d1bc0a | 1935 | |
fe7e3257 | 1936 | BUILD_BUG_ON(ARRAY_SIZE(state->reqs) < IO_REQ_ALLOC_BATCH); |
e5d1bc0a | 1937 | |
864ea921 PB |
1938 | if (likely(state->free_reqs || io_flush_cached_reqs(ctx))) |
1939 | goto got_req; | |
e5d1bc0a | 1940 | |
864ea921 PB |
1941 | ret = kmem_cache_alloc_bulk(req_cachep, gfp, IO_REQ_ALLOC_BATCH, |
1942 | state->reqs); | |
fd6fab2c | 1943 | |
864ea921 PB |
1944 | /* |
1945 | * Bulk alloc is all-or-nothing. If we fail to get a batch, | |
1946 | * retry single alloc to be on the safe side. | |
1947 | */ | |
1948 | if (unlikely(ret <= 0)) { | |
1949 | state->reqs[0] = kmem_cache_alloc(req_cachep, gfp); | |
1950 | if (!state->reqs[0]) | |
1951 | return NULL; | |
1952 | ret = 1; | |
2b188cc1 | 1953 | } |
864ea921 PB |
1954 | |
1955 | for (i = 0; i < ret; i++) | |
1956 | io_preinit_req(state->reqs[i], ctx); | |
1957 | state->free_reqs = ret; | |
e5d1bc0a | 1958 | got_req: |
291b2821 PB |
1959 | state->free_reqs--; |
1960 | return state->reqs[state->free_reqs]; | |
2b188cc1 JA |
1961 | } |
1962 | ||
e1d767f0 | 1963 | static inline void io_put_file(struct file *file) |
8da11c19 | 1964 | { |
e1d767f0 | 1965 | if (file) |
8da11c19 PB |
1966 | fput(file); |
1967 | } | |
1968 | ||
4edf20f9 | 1969 | static void io_dismantle_req(struct io_kiocb *req) |
2b188cc1 | 1970 | { |
094bae49 | 1971 | unsigned int flags = req->flags; |
929a3af9 | 1972 | |
3a0a6902 PB |
1973 | if (io_req_needs_clean(req)) |
1974 | io_clean_op(req); | |
e1d767f0 PB |
1975 | if (!(flags & REQ_F_FIXED_FILE)) |
1976 | io_put_file(req->file); | |
269bbe5f BM |
1977 | if (req->fixed_rsrc_refs) |
1978 | percpu_ref_put(req->fixed_rsrc_refs); | |
99ebe4ef | 1979 | if (req->async_data) { |
094bae49 | 1980 | kfree(req->async_data); |
99ebe4ef PB |
1981 | req->async_data = NULL; |
1982 | } | |
e65ef56d JA |
1983 | } |
1984 | ||
216578e5 | 1985 | static void __io_free_req(struct io_kiocb *req) |
c6ca97b3 | 1986 | { |
51a4cc11 | 1987 | struct io_ring_ctx *ctx = req->ctx; |
c6ca97b3 | 1988 | |
216578e5 | 1989 | io_dismantle_req(req); |
7c660731 | 1990 | io_put_task(req->task, 1); |
c6ca97b3 | 1991 | |
79ebeaee | 1992 | spin_lock(&ctx->completion_lock); |
bb943b82 | 1993 | list_add(&req->inflight_entry, &ctx->locked_free_list); |
c34b025f | 1994 | ctx->locked_free_nr++; |
79ebeaee | 1995 | spin_unlock(&ctx->completion_lock); |
c34b025f | 1996 | |
ecfc5177 | 1997 | percpu_ref_put(&ctx->refs); |
e65ef56d JA |
1998 | } |
1999 | ||
f2f87370 PB |
2000 | static inline void io_remove_next_linked(struct io_kiocb *req) |
2001 | { | |
2002 | struct io_kiocb *nxt = req->link; | |
2003 | ||
2004 | req->link = nxt->link; | |
2005 | nxt->link = NULL; | |
2006 | } | |
2007 | ||
33cc89a9 PB |
2008 | static bool io_kill_linked_timeout(struct io_kiocb *req) |
2009 | __must_hold(&req->ctx->completion_lock) | |
89b263f6 | 2010 | __must_hold(&req->ctx->timeout_lock) |
2665abfd | 2011 | { |
33cc89a9 | 2012 | struct io_kiocb *link = req->link; |
f2f87370 | 2013 | |
b97e736a | 2014 | if (link && link->opcode == IORING_OP_LINK_TIMEOUT) { |
c9abd7ad | 2015 | struct io_timeout_data *io = link->async_data; |
7c86ffee | 2016 | |
f2f87370 | 2017 | io_remove_next_linked(req); |
90cd7e42 | 2018 | link->timeout.head = NULL; |
fd9c7bc5 | 2019 | if (hrtimer_try_to_cancel(&io->timer) != -1) { |
ef9dd637 | 2020 | list_del(&link->timeout.list); |
d4d19c19 PB |
2021 | io_cqring_fill_event(link->ctx, link->user_data, |
2022 | -ECANCELED, 0); | |
91c2f697 | 2023 | io_put_req_deferred(link); |
d4729fbd | 2024 | return true; |
c9abd7ad PB |
2025 | } |
2026 | } | |
d4729fbd | 2027 | return false; |
7c86ffee PB |
2028 | } |
2029 | ||
d148ca4b | 2030 | static void io_fail_links(struct io_kiocb *req) |
33cc89a9 | 2031 | __must_hold(&req->ctx->completion_lock) |
9e645e11 | 2032 | { |
33cc89a9 | 2033 | struct io_kiocb *nxt, *link = req->link; |
9e645e11 | 2034 | |
f2f87370 | 2035 | req->link = NULL; |
f2f87370 | 2036 | while (link) { |
a8295b98 HX |
2037 | long res = -ECANCELED; |
2038 | ||
2039 | if (link->flags & REQ_F_FAIL) | |
2040 | res = link->result; | |
2041 | ||
f2f87370 PB |
2042 | nxt = link->link; |
2043 | link->link = NULL; | |
2665abfd | 2044 | |
f2f87370 | 2045 | trace_io_uring_fail_link(req, link); |
a8295b98 | 2046 | io_cqring_fill_event(link->ctx, link->user_data, res, 0); |
91c2f697 | 2047 | io_put_req_deferred(link); |
f2f87370 | 2048 | link = nxt; |
9e645e11 | 2049 | } |
33cc89a9 | 2050 | } |
9e645e11 | 2051 | |
33cc89a9 PB |
2052 | static bool io_disarm_next(struct io_kiocb *req) |
2053 | __must_hold(&req->ctx->completion_lock) | |
2054 | { | |
2055 | bool posted = false; | |
2056 | ||
0756a869 PB |
2057 | if (req->flags & REQ_F_ARM_LTIMEOUT) { |
2058 | struct io_kiocb *link = req->link; | |
2059 | ||
906c6caa | 2060 | req->flags &= ~REQ_F_ARM_LTIMEOUT; |
0756a869 PB |
2061 | if (link && link->opcode == IORING_OP_LINK_TIMEOUT) { |
2062 | io_remove_next_linked(req); | |
2063 | io_cqring_fill_event(link->ctx, link->user_data, | |
2064 | -ECANCELED, 0); | |
2065 | io_put_req_deferred(link); | |
2066 | posted = true; | |
2067 | } | |
2068 | } else if (req->flags & REQ_F_LINK_TIMEOUT) { | |
89b263f6 JA |
2069 | struct io_ring_ctx *ctx = req->ctx; |
2070 | ||
2071 | spin_lock_irq(&ctx->timeout_lock); | |
33cc89a9 | 2072 | posted = io_kill_linked_timeout(req); |
89b263f6 JA |
2073 | spin_unlock_irq(&ctx->timeout_lock); |
2074 | } | |
93d2bcd2 | 2075 | if (unlikely((req->flags & REQ_F_FAIL) && |
e4335ed3 | 2076 | !(req->flags & REQ_F_HARDLINK))) { |
33cc89a9 PB |
2077 | posted |= (req->link != NULL); |
2078 | io_fail_links(req); | |
2079 | } | |
2080 | return posted; | |
9e645e11 JA |
2081 | } |
2082 | ||
3fa5e0f3 | 2083 | static struct io_kiocb *__io_req_find_next(struct io_kiocb *req) |
c69f8dbe | 2084 | { |
33cc89a9 | 2085 | struct io_kiocb *nxt; |
944e58bf | 2086 | |
9e645e11 JA |
2087 | /* |
2088 | * If LINK is set, we have dependent requests in this chain. If we | |
2089 | * didn't fail this request, queue the first one up, moving any other | |
2090 | * dependencies to the next request. In case of failure, fail the rest | |
2091 | * of the chain. | |
2092 | */ | |
0756a869 | 2093 | if (req->flags & IO_DISARM_MASK) { |
33cc89a9 | 2094 | struct io_ring_ctx *ctx = req->ctx; |
33cc89a9 PB |
2095 | bool posted; |
2096 | ||
79ebeaee | 2097 | spin_lock(&ctx->completion_lock); |
33cc89a9 PB |
2098 | posted = io_disarm_next(req); |
2099 | if (posted) | |
2100 | io_commit_cqring(req->ctx); | |
79ebeaee | 2101 | spin_unlock(&ctx->completion_lock); |
33cc89a9 PB |
2102 | if (posted) |
2103 | io_cqring_ev_posted(ctx); | |
f2f87370 | 2104 | } |
33cc89a9 PB |
2105 | nxt = req->link; |
2106 | req->link = NULL; | |
2107 | return nxt; | |
4d7dd462 | 2108 | } |
9e645e11 | 2109 | |
f2f87370 | 2110 | static inline struct io_kiocb *io_req_find_next(struct io_kiocb *req) |
3fa5e0f3 | 2111 | { |
cdbff982 | 2112 | if (likely(!(req->flags & (REQ_F_LINK|REQ_F_HARDLINK)))) |
3fa5e0f3 PB |
2113 | return NULL; |
2114 | return __io_req_find_next(req); | |
2115 | } | |
2116 | ||
f237c30a | 2117 | static void ctx_flush_and_put(struct io_ring_ctx *ctx, bool *locked) |
2c32395d PB |
2118 | { |
2119 | if (!ctx) | |
2120 | return; | |
f237c30a | 2121 | if (*locked) { |
99c8bc52 HX |
2122 | if (ctx->submit_state.compl_nr) |
2123 | io_submit_flush_completions(ctx); | |
2c32395d | 2124 | mutex_unlock(&ctx->uring_lock); |
f237c30a | 2125 | *locked = false; |
2c32395d PB |
2126 | } |
2127 | percpu_ref_put(&ctx->refs); | |
2128 | } | |
2129 | ||
7cbf1722 | 2130 | static void tctx_task_work(struct callback_head *cb) |
c40f6379 | 2131 | { |
f237c30a | 2132 | bool locked = false; |
ebd0df2e | 2133 | struct io_ring_ctx *ctx = NULL; |
3f18407d PB |
2134 | struct io_uring_task *tctx = container_of(cb, struct io_uring_task, |
2135 | task_work); | |
c40f6379 | 2136 | |
16f72070 | 2137 | while (1) { |
3f18407d PB |
2138 | struct io_wq_work_node *node; |
2139 | ||
8d4ad41e PB |
2140 | if (!tctx->task_list.first && locked && ctx->submit_state.compl_nr) |
2141 | io_submit_flush_completions(ctx); | |
2142 | ||
3f18407d | 2143 | spin_lock_irq(&tctx->task_lock); |
c6538be9 | 2144 | node = tctx->task_list.first; |
3f18407d | 2145 | INIT_WQ_LIST(&tctx->task_list); |
6294f368 PB |
2146 | if (!node) |
2147 | tctx->task_running = false; | |
3f18407d | 2148 | spin_unlock_irq(&tctx->task_lock); |
6294f368 PB |
2149 | if (!node) |
2150 | break; | |
3f18407d | 2151 | |
6294f368 | 2152 | do { |
3f18407d PB |
2153 | struct io_wq_work_node *next = node->next; |
2154 | struct io_kiocb *req = container_of(node, struct io_kiocb, | |
2155 | io_task_work.node); | |
2156 | ||
2157 | if (req->ctx != ctx) { | |
f237c30a | 2158 | ctx_flush_and_put(ctx, &locked); |
3f18407d | 2159 | ctx = req->ctx; |
126180b9 PB |
2160 | /* if not contended, grab and improve batching */ |
2161 | locked = mutex_trylock(&ctx->uring_lock); | |
3f18407d PB |
2162 | percpu_ref_get(&ctx->refs); |
2163 | } | |
f237c30a | 2164 | req->io_task_work.func(req, &locked); |
3f18407d | 2165 | node = next; |
6294f368 PB |
2166 | } while (node); |
2167 | ||
7cbf1722 | 2168 | cond_resched(); |
3f18407d | 2169 | } |
ebd0df2e | 2170 | |
f237c30a | 2171 | ctx_flush_and_put(ctx, &locked); |
7cbf1722 JA |
2172 | } |
2173 | ||
e09ee510 | 2174 | static void io_req_task_work_add(struct io_kiocb *req) |
7cbf1722 | 2175 | { |
c15b79de | 2176 | struct task_struct *tsk = req->task; |
7cbf1722 | 2177 | struct io_uring_task *tctx = tsk->io_uring; |
c15b79de | 2178 | enum task_work_notify_mode notify; |
e09ee510 | 2179 | struct io_wq_work_node *node; |
0b81e80c | 2180 | unsigned long flags; |
6294f368 | 2181 | bool running; |
7cbf1722 JA |
2182 | |
2183 | WARN_ON_ONCE(!tctx); | |
2184 | ||
0b81e80c | 2185 | spin_lock_irqsave(&tctx->task_lock, flags); |
7cbf1722 | 2186 | wq_list_add_tail(&req->io_task_work.node, &tctx->task_list); |
6294f368 PB |
2187 | running = tctx->task_running; |
2188 | if (!running) | |
2189 | tctx->task_running = true; | |
0b81e80c | 2190 | spin_unlock_irqrestore(&tctx->task_lock, flags); |
7cbf1722 JA |
2191 | |
2192 | /* task_work already pending, we're done */ | |
6294f368 | 2193 | if (running) |
e09ee510 | 2194 | return; |
7cbf1722 | 2195 | |
c15b79de PB |
2196 | /* |
2197 | * SQPOLL kernel thread doesn't need notification, just a wakeup. For | |
2198 | * all other cases, use TWA_SIGNAL unconditionally to ensure we're | |
2199 | * processing task_work. There's no reliable way to tell if TWA_RESUME | |
2200 | * will do the job. | |
2201 | */ | |
2202 | notify = (req->ctx->flags & IORING_SETUP_SQPOLL) ? TWA_NONE : TWA_SIGNAL; | |
c15b79de PB |
2203 | if (!task_work_add(tsk, &tctx->task_work, notify)) { |
2204 | wake_up_process(tsk); | |
e09ee510 | 2205 | return; |
c15b79de | 2206 | } |
2215bed9 | 2207 | |
0b81e80c | 2208 | spin_lock_irqsave(&tctx->task_lock, flags); |
6294f368 | 2209 | tctx->task_running = false; |
e09ee510 PB |
2210 | node = tctx->task_list.first; |
2211 | INIT_WQ_LIST(&tctx->task_list); | |
0b81e80c | 2212 | spin_unlock_irqrestore(&tctx->task_lock, flags); |
7cbf1722 | 2213 | |
e09ee510 PB |
2214 | while (node) { |
2215 | req = container_of(node, struct io_kiocb, io_task_work.node); | |
2216 | node = node->next; | |
2217 | if (llist_add(&req->io_task_work.fallback_node, | |
2218 | &req->ctx->fallback_llist)) | |
2219 | schedule_delayed_work(&req->ctx->fallback_work, 1); | |
2220 | } | |
eab30c4d PB |
2221 | } |
2222 | ||
f237c30a | 2223 | static void io_req_task_cancel(struct io_kiocb *req, bool *locked) |
c40f6379 | 2224 | { |
87ceb6a6 | 2225 | struct io_ring_ctx *ctx = req->ctx; |
c40f6379 | 2226 | |
b18a1a45 | 2227 | /* not needed for normal modes, but SQPOLL depends on it */ |
f237c30a | 2228 | io_tw_lock(ctx, locked); |
2593553a | 2229 | io_req_complete_failed(req, req->result); |
c40f6379 JA |
2230 | } |
2231 | ||
f237c30a | 2232 | static void io_req_task_submit(struct io_kiocb *req, bool *locked) |
c40f6379 JA |
2233 | { |
2234 | struct io_ring_ctx *ctx = req->ctx; | |
2235 | ||
f237c30a | 2236 | io_tw_lock(ctx, locked); |
316319e8 | 2237 | /* req->task == current here, checking PF_EXITING is safe */ |
af066f31 | 2238 | if (likely(!(req->task->flags & PF_EXITING))) |
c5eef2b9 | 2239 | __io_queue_sqe(req); |
81b6d05c | 2240 | else |
2593553a | 2241 | io_req_complete_failed(req, -EFAULT); |
c40f6379 JA |
2242 | } |
2243 | ||
2c4b8eb6 | 2244 | static void io_req_task_queue_fail(struct io_kiocb *req, int ret) |
c40f6379 | 2245 | { |
2c4b8eb6 | 2246 | req->result = ret; |
5b0a6acc | 2247 | req->io_task_work.func = io_req_task_cancel; |
e09ee510 | 2248 | io_req_task_work_add(req); |
c40f6379 JA |
2249 | } |
2250 | ||
2c4b8eb6 | 2251 | static void io_req_task_queue(struct io_kiocb *req) |
a3df7698 | 2252 | { |
5b0a6acc | 2253 | req->io_task_work.func = io_req_task_submit; |
e09ee510 | 2254 | io_req_task_work_add(req); |
a3df7698 PB |
2255 | } |
2256 | ||
773af691 JA |
2257 | static void io_req_task_queue_reissue(struct io_kiocb *req) |
2258 | { | |
2259 | req->io_task_work.func = io_queue_async_work; | |
2260 | io_req_task_work_add(req); | |
2261 | } | |
2262 | ||
f2f87370 | 2263 | static inline void io_queue_next(struct io_kiocb *req) |
c69f8dbe | 2264 | { |
9b5f7bd9 | 2265 | struct io_kiocb *nxt = io_req_find_next(req); |
944e58bf PB |
2266 | |
2267 | if (nxt) | |
906a8c3f | 2268 | io_req_task_queue(nxt); |
c69f8dbe JL |
2269 | } |
2270 | ||
c3524383 | 2271 | static void io_free_req(struct io_kiocb *req) |
7a743e22 | 2272 | { |
c3524383 PB |
2273 | io_queue_next(req); |
2274 | __io_free_req(req); | |
2275 | } | |
8766dd51 | 2276 | |
f237c30a PB |
2277 | static void io_free_req_work(struct io_kiocb *req, bool *locked) |
2278 | { | |
2279 | io_free_req(req); | |
2280 | } | |
2281 | ||
2d6500d4 | 2282 | struct req_batch { |
5af1d13e PB |
2283 | struct task_struct *task; |
2284 | int task_refs; | |
1b4c351f | 2285 | int ctx_refs; |
2d6500d4 PB |
2286 | }; |
2287 | ||
5af1d13e PB |
2288 | static inline void io_init_req_batch(struct req_batch *rb) |
2289 | { | |
5af1d13e | 2290 | rb->task_refs = 0; |
9ae72463 | 2291 | rb->ctx_refs = 0; |
5af1d13e PB |
2292 | rb->task = NULL; |
2293 | } | |
2294 | ||
2d6500d4 PB |
2295 | static void io_req_free_batch_finish(struct io_ring_ctx *ctx, |
2296 | struct req_batch *rb) | |
2297 | { | |
9ae72463 PB |
2298 | if (rb->ctx_refs) |
2299 | percpu_ref_put_many(&ctx->refs, rb->ctx_refs); | |
e98e49b2 | 2300 | if (rb->task) |
e9dbe221 | 2301 | io_put_task(rb->task, rb->task_refs); |
2d6500d4 PB |
2302 | } |
2303 | ||
6ff119a6 PB |
2304 | static void io_req_free_batch(struct req_batch *rb, struct io_kiocb *req, |
2305 | struct io_submit_state *state) | |
2d6500d4 | 2306 | { |
f2f87370 | 2307 | io_queue_next(req); |
96670657 | 2308 | io_dismantle_req(req); |
2d6500d4 | 2309 | |
e3bc8e9d | 2310 | if (req->task != rb->task) { |
7c660731 PB |
2311 | if (rb->task) |
2312 | io_put_task(rb->task, rb->task_refs); | |
e3bc8e9d JA |
2313 | rb->task = req->task; |
2314 | rb->task_refs = 0; | |
5af1d13e | 2315 | } |
e3bc8e9d | 2316 | rb->task_refs++; |
9ae72463 | 2317 | rb->ctx_refs++; |
5af1d13e | 2318 | |
bd759045 | 2319 | if (state->free_reqs != ARRAY_SIZE(state->reqs)) |
6ff119a6 | 2320 | state->reqs[state->free_reqs++] = req; |
bd759045 | 2321 | else |
cd0ca2e0 | 2322 | list_add(&req->inflight_entry, &state->free_list); |
7a743e22 PB |
2323 | } |
2324 | ||
2a2758f2 | 2325 | static void io_submit_flush_completions(struct io_ring_ctx *ctx) |
a141dd89 | 2326 | __must_hold(&ctx->uring_lock) |
905c172f | 2327 | { |
cd0ca2e0 PB |
2328 | struct io_submit_state *state = &ctx->submit_state; |
2329 | int i, nr = state->compl_nr; | |
905c172f PB |
2330 | struct req_batch rb; |
2331 | ||
79ebeaee | 2332 | spin_lock(&ctx->completion_lock); |
905c172f | 2333 | for (i = 0; i < nr; i++) { |
cd0ca2e0 | 2334 | struct io_kiocb *req = state->compl_reqs[i]; |
5182ed2e | 2335 | |
d4d19c19 PB |
2336 | __io_cqring_fill_event(ctx, req->user_data, req->result, |
2337 | req->compl.cflags); | |
905c172f PB |
2338 | } |
2339 | io_commit_cqring(ctx); | |
79ebeaee | 2340 | spin_unlock(&ctx->completion_lock); |
905c172f | 2341 | io_cqring_ev_posted(ctx); |
5182ed2e PB |
2342 | |
2343 | io_init_req_batch(&rb); | |
905c172f | 2344 | for (i = 0; i < nr; i++) { |
cd0ca2e0 | 2345 | struct io_kiocb *req = state->compl_reqs[i]; |
905c172f | 2346 | |
91c2f697 | 2347 | if (req_ref_put_and_test(req)) |
6ff119a6 | 2348 | io_req_free_batch(&rb, req, &ctx->submit_state); |
905c172f PB |
2349 | } |
2350 | ||
2351 | io_req_free_batch_finish(ctx, &rb); | |
cd0ca2e0 | 2352 | state->compl_nr = 0; |
7a743e22 PB |
2353 | } |
2354 | ||
ba816ad6 JA |
2355 | /* |
2356 | * Drop reference to request, return next in chain (if there is one) if this | |
2357 | * was the last reference to this request. | |
2358 | */ | |
0d85035a | 2359 | static inline struct io_kiocb *io_put_req_find_next(struct io_kiocb *req) |
e65ef56d | 2360 | { |
9b5f7bd9 PB |
2361 | struct io_kiocb *nxt = NULL; |
2362 | ||
de9b4cca | 2363 | if (req_ref_put_and_test(req)) { |
9b5f7bd9 | 2364 | nxt = io_req_find_next(req); |
4d7dd462 | 2365 | __io_free_req(req); |
2a44f467 | 2366 | } |
9b5f7bd9 | 2367 | return nxt; |
2b188cc1 JA |
2368 | } |
2369 | ||
0d85035a | 2370 | static inline void io_put_req(struct io_kiocb *req) |
e65ef56d | 2371 | { |
de9b4cca | 2372 | if (req_ref_put_and_test(req)) |
e65ef56d | 2373 | io_free_req(req); |
2b188cc1 JA |
2374 | } |
2375 | ||
91c2f697 | 2376 | static inline void io_put_req_deferred(struct io_kiocb *req) |
216578e5 | 2377 | { |
91c2f697 | 2378 | if (req_ref_put_and_test(req)) { |
f237c30a | 2379 | req->io_task_work.func = io_free_req_work; |
543af3a1 PB |
2380 | io_req_task_work_add(req); |
2381 | } | |
216578e5 PB |
2382 | } |
2383 | ||
6c503150 | 2384 | static unsigned io_cqring_events(struct io_ring_ctx *ctx) |
a3a0e43f JA |
2385 | { |
2386 | /* See comment at the top of this file */ | |
2387 | smp_rmb(); | |
e23de15f | 2388 | return __io_cqring_events(ctx); |
a3a0e43f JA |
2389 | } |
2390 | ||
fb5ccc98 PB |
2391 | static inline unsigned int io_sqring_entries(struct io_ring_ctx *ctx) |
2392 | { | |
2393 | struct io_rings *rings = ctx->rings; | |
2394 | ||
2395 | /* make sure SQ entry isn't read before tail */ | |
2396 | return smp_load_acquire(&rings->sq.tail) - ctx->cached_sq_head; | |
2397 | } | |
2398 | ||
8ff069bf | 2399 | static unsigned int io_put_kbuf(struct io_kiocb *req, struct io_buffer *kbuf) |
e94f141b | 2400 | { |
8ff069bf | 2401 | unsigned int cflags; |
e94f141b | 2402 | |
bcda7baa JA |
2403 | cflags = kbuf->bid << IORING_CQE_BUFFER_SHIFT; |
2404 | cflags |= IORING_CQE_F_BUFFER; | |
0e1b6fe3 | 2405 | req->flags &= ~REQ_F_BUFFER_SELECTED; |
bcda7baa JA |
2406 | kfree(kbuf); |
2407 | return cflags; | |
e94f141b JA |
2408 | } |
2409 | ||
8ff069bf | 2410 | static inline unsigned int io_put_rw_kbuf(struct io_kiocb *req) |
bcda7baa | 2411 | { |
4d954c25 | 2412 | struct io_buffer *kbuf; |
bcda7baa | 2413 | |
ae421d93 PB |
2414 | if (likely(!(req->flags & REQ_F_BUFFER_SELECTED))) |
2415 | return 0; | |
4d954c25 | 2416 | kbuf = (struct io_buffer *) (unsigned long) req->rw.addr; |
8ff069bf PB |
2417 | return io_put_kbuf(req, kbuf); |
2418 | } | |
2419 | ||
4c6e277c JA |
2420 | static inline bool io_run_task_work(void) |
2421 | { | |
ef98eb04 | 2422 | if (test_thread_flag(TIF_NOTIFY_SIGNAL) || current->task_works) { |
4c6e277c | 2423 | __set_current_state(TASK_RUNNING); |
ef98eb04 | 2424 | tracehook_notify_signal(); |
4c6e277c JA |
2425 | return true; |
2426 | } | |
2427 | ||
2428 | return false; | |
bcda7baa JA |
2429 | } |
2430 | ||
def596e9 JA |
2431 | /* |
2432 | * Find and free completed poll iocbs | |
2433 | */ | |
2434 | static void io_iopoll_complete(struct io_ring_ctx *ctx, unsigned int *nr_events, | |
a8576af9 | 2435 | struct list_head *done) |
def596e9 | 2436 | { |
8237e045 | 2437 | struct req_batch rb; |
def596e9 | 2438 | struct io_kiocb *req; |
bbde017a XW |
2439 | |
2440 | /* order with ->result store in io_complete_rw_iopoll() */ | |
2441 | smp_rmb(); | |
def596e9 | 2442 | |
5af1d13e | 2443 | io_init_req_batch(&rb); |
def596e9 | 2444 | while (!list_empty(done)) { |
d21ffe7e | 2445 | req = list_first_entry(done, struct io_kiocb, inflight_entry); |
f161340d PB |
2446 | list_del(&req->inflight_entry); |
2447 | ||
ae421d93 PB |
2448 | __io_cqring_fill_event(ctx, req->user_data, req->result, |
2449 | io_put_rw_kbuf(req)); | |
def596e9 JA |
2450 | (*nr_events)++; |
2451 | ||
de9b4cca | 2452 | if (req_ref_put_and_test(req)) |
6ff119a6 | 2453 | io_req_free_batch(&rb, req, &ctx->submit_state); |
def596e9 | 2454 | } |
def596e9 | 2455 | |
09bb8394 | 2456 | io_commit_cqring(ctx); |
80c18e4a | 2457 | io_cqring_ev_posted_iopoll(ctx); |
2d6500d4 | 2458 | io_req_free_batch_finish(ctx, &rb); |
581f9810 BM |
2459 | } |
2460 | ||
def596e9 | 2461 | static int io_do_iopoll(struct io_ring_ctx *ctx, unsigned int *nr_events, |
a8576af9 | 2462 | long min) |
def596e9 JA |
2463 | { |
2464 | struct io_kiocb *req, *tmp; | |
2465 | LIST_HEAD(done); | |
2466 | bool spin; | |
def596e9 JA |
2467 | |
2468 | /* | |
2469 | * Only spin for completions if we don't have multiple devices hanging | |
2470 | * off our complete list, and we're under the requested amount. | |
2471 | */ | |
915b3dde | 2472 | spin = !ctx->poll_multi_queue && *nr_events < min; |
def596e9 | 2473 | |
d21ffe7e | 2474 | list_for_each_entry_safe(req, tmp, &ctx->iopoll_list, inflight_entry) { |
9adbd45d | 2475 | struct kiocb *kiocb = &req->rw.kiocb; |
a2416e1e | 2476 | int ret; |
def596e9 JA |
2477 | |
2478 | /* | |
581f9810 BM |
2479 | * Move completed and retryable entries to our local lists. |
2480 | * If we find a request that requires polling, break out | |
2481 | * and complete those lists first, if we have entries there. | |
def596e9 | 2482 | */ |
65a6543d | 2483 | if (READ_ONCE(req->iopoll_completed)) { |
d21ffe7e | 2484 | list_move_tail(&req->inflight_entry, &done); |
def596e9 JA |
2485 | continue; |
2486 | } | |
2487 | if (!list_empty(&done)) | |
2488 | break; | |
2489 | ||
2490 | ret = kiocb->ki_filp->f_op->iopoll(kiocb, spin); | |
a2416e1e PB |
2491 | if (unlikely(ret < 0)) |
2492 | return ret; | |
2493 | else if (ret) | |
2494 | spin = false; | |
def596e9 | 2495 | |
3aadc23e PB |
2496 | /* iopoll may have completed current req */ |
2497 | if (READ_ONCE(req->iopoll_completed)) | |
d21ffe7e | 2498 | list_move_tail(&req->inflight_entry, &done); |
def596e9 JA |
2499 | } |
2500 | ||
2501 | if (!list_empty(&done)) | |
a8576af9 | 2502 | io_iopoll_complete(ctx, nr_events, &done); |
def596e9 | 2503 | |
a2416e1e | 2504 | return 0; |
def596e9 JA |
2505 | } |
2506 | ||
def596e9 JA |
2507 | /* |
2508 | * We can't just wait for polled events to come to us, we have to actively | |
2509 | * find and complete them. | |
2510 | */ | |
b2edc0a7 | 2511 | static void io_iopoll_try_reap_events(struct io_ring_ctx *ctx) |
def596e9 JA |
2512 | { |
2513 | if (!(ctx->flags & IORING_SETUP_IOPOLL)) | |
2514 | return; | |
2515 | ||
2516 | mutex_lock(&ctx->uring_lock); | |
540e32a0 | 2517 | while (!list_empty(&ctx->iopoll_list)) { |
def596e9 JA |
2518 | unsigned int nr_events = 0; |
2519 | ||
a8576af9 | 2520 | io_do_iopoll(ctx, &nr_events, 0); |
08f5439f | 2521 | |
b2edc0a7 PB |
2522 | /* let it sleep and repeat later if can't complete a request */ |
2523 | if (nr_events == 0) | |
2524 | break; | |
08f5439f JA |
2525 | /* |
2526 | * Ensure we allow local-to-the-cpu processing to take place, | |
2527 | * in this case we need to ensure that we reap all events. | |
3fcee5a6 | 2528 | * Also let task_work, etc. to progress by releasing the mutex |
08f5439f | 2529 | */ |
3fcee5a6 PB |
2530 | if (need_resched()) { |
2531 | mutex_unlock(&ctx->uring_lock); | |
2532 | cond_resched(); | |
2533 | mutex_lock(&ctx->uring_lock); | |
2534 | } | |
def596e9 JA |
2535 | } |
2536 | mutex_unlock(&ctx->uring_lock); | |
2537 | } | |
2538 | ||
7668b92a | 2539 | static int io_iopoll_check(struct io_ring_ctx *ctx, long min) |
def596e9 | 2540 | { |
7668b92a | 2541 | unsigned int nr_events = 0; |
e9979b36 | 2542 | int ret = 0; |
500f9fba | 2543 | |
c7849be9 XW |
2544 | /* |
2545 | * We disallow the app entering submit/complete with polling, but we | |
2546 | * still need to lock the ring to prevent racing with polled issue | |
2547 | * that got punted to a workqueue. | |
2548 | */ | |
2549 | mutex_lock(&ctx->uring_lock); | |
f39c8a5b PB |
2550 | /* |
2551 | * Don't enter poll loop if we already have events pending. | |
2552 | * If we do, we can potentially be spinning for commands that | |
2553 | * already triggered a CQE (eg in error). | |
2554 | */ | |
5ed7a37d | 2555 | if (test_bit(0, &ctx->check_cq_overflow)) |
f39c8a5b PB |
2556 | __io_cqring_overflow_flush(ctx, false); |
2557 | if (io_cqring_events(ctx)) | |
2558 | goto out; | |
def596e9 | 2559 | do { |
500f9fba JA |
2560 | /* |
2561 | * If a submit got punted to a workqueue, we can have the | |
2562 | * application entering polling for a command before it gets | |
2563 | * issued. That app will hold the uring_lock for the duration | |
2564 | * of the poll right here, so we need to take a breather every | |
2565 | * now and then to ensure that the issue has a chance to add | |
2566 | * the poll to the issued list. Otherwise we can spin here | |
2567 | * forever, while the workqueue is stuck trying to acquire the | |
2568 | * very same mutex. | |
2569 | */ | |
e9979b36 | 2570 | if (list_empty(&ctx->iopoll_list)) { |
8f487ef2 PB |
2571 | u32 tail = ctx->cached_cq_tail; |
2572 | ||
500f9fba | 2573 | mutex_unlock(&ctx->uring_lock); |
4c6e277c | 2574 | io_run_task_work(); |
500f9fba | 2575 | mutex_lock(&ctx->uring_lock); |
def596e9 | 2576 | |
8f487ef2 PB |
2577 | /* some requests don't go through iopoll_list */ |
2578 | if (tail != ctx->cached_cq_tail || | |
2579 | list_empty(&ctx->iopoll_list)) | |
e9979b36 | 2580 | break; |
500f9fba | 2581 | } |
a8576af9 | 2582 | ret = io_do_iopoll(ctx, &nr_events, min); |
f39c8a5b PB |
2583 | } while (!ret && nr_events < min && !need_resched()); |
2584 | out: | |
500f9fba | 2585 | mutex_unlock(&ctx->uring_lock); |
def596e9 JA |
2586 | return ret; |
2587 | } | |
2588 | ||
491381ce | 2589 | static void kiocb_end_write(struct io_kiocb *req) |
2b188cc1 | 2590 | { |
491381ce JA |
2591 | /* |
2592 | * Tell lockdep we inherited freeze protection from submission | |
2593 | * thread. | |
2594 | */ | |
2595 | if (req->flags & REQ_F_ISREG) { | |
1c98679d | 2596 | struct super_block *sb = file_inode(req->file)->i_sb; |
2b188cc1 | 2597 | |
1c98679d PB |
2598 | __sb_writers_acquired(sb, SB_FREEZE_WRITE); |
2599 | sb_end_write(sb); | |
2b188cc1 JA |
2600 | } |
2601 | } | |
2602 | ||
b63534c4 | 2603 | #ifdef CONFIG_BLOCK |
dc2a6e9a | 2604 | static bool io_resubmit_prep(struct io_kiocb *req) |
b63534c4 | 2605 | { |
ab454438 | 2606 | struct io_async_rw *rw = req->async_data; |
b63534c4 | 2607 | |
ab454438 PB |
2608 | if (!rw) |
2609 | return !io_req_prep_async(req); | |
cd658695 | 2610 | iov_iter_restore(&rw->iter, &rw->iter_state); |
ab454438 | 2611 | return true; |
b63534c4 | 2612 | } |
b63534c4 | 2613 | |
3e6a0d3c | 2614 | static bool io_rw_should_reissue(struct io_kiocb *req) |
b63534c4 | 2615 | { |
355afaeb | 2616 | umode_t mode = file_inode(req->file)->i_mode; |
3e6a0d3c | 2617 | struct io_ring_ctx *ctx = req->ctx; |
b63534c4 | 2618 | |
355afaeb JA |
2619 | if (!S_ISBLK(mode) && !S_ISREG(mode)) |
2620 | return false; | |
3e6a0d3c JA |
2621 | if ((req->flags & REQ_F_NOWAIT) || (io_wq_current_is_worker() && |
2622 | !(ctx->flags & IORING_SETUP_IOPOLL))) | |
b63534c4 | 2623 | return false; |
7c977a58 JA |
2624 | /* |
2625 | * If ref is dying, we might be running poll reap from the exit work. | |
2626 | * Don't attempt to reissue from that path, just let it fail with | |
2627 | * -EAGAIN. | |
2628 | */ | |
3e6a0d3c JA |
2629 | if (percpu_ref_is_dying(&ctx->refs)) |
2630 | return false; | |
ef046888 JA |
2631 | /* |
2632 | * Play it safe and assume not safe to re-import and reissue if we're | |
2633 | * not in the original thread group (or in task context). | |
2634 | */ | |
2635 | if (!same_thread_group(req->task, current) || !in_task()) | |
2636 | return false; | |
3e6a0d3c JA |
2637 | return true; |
2638 | } | |
e82ad485 | 2639 | #else |
a1ff1e3f | 2640 | static bool io_resubmit_prep(struct io_kiocb *req) |
e82ad485 JA |
2641 | { |
2642 | return false; | |
2643 | } | |
e82ad485 | 2644 | static bool io_rw_should_reissue(struct io_kiocb *req) |
3e6a0d3c | 2645 | { |
b63534c4 JA |
2646 | return false; |
2647 | } | |
3e6a0d3c | 2648 | #endif |
b63534c4 | 2649 | |
8ef12efe | 2650 | static bool __io_complete_rw_common(struct io_kiocb *req, long res) |
a1d7c393 | 2651 | { |
b65c128f PB |
2652 | if (req->rw.kiocb.ki_flags & IOCB_WRITE) |
2653 | kiocb_end_write(req); | |
9532b99b PB |
2654 | if (res != req->result) { |
2655 | if ((res == -EAGAIN || res == -EOPNOTSUPP) && | |
2656 | io_rw_should_reissue(req)) { | |
2657 | req->flags |= REQ_F_REISSUE; | |
8ef12efe | 2658 | return true; |
9532b99b | 2659 | } |
93d2bcd2 | 2660 | req_set_fail(req); |
8ef12efe | 2661 | req->result = res; |
9532b99b | 2662 | } |
8ef12efe JA |
2663 | return false; |
2664 | } | |
2665 | ||
f237c30a | 2666 | static void io_req_task_complete(struct io_kiocb *req, bool *locked) |
8ef12efe | 2667 | { |
126180b9 PB |
2668 | unsigned int cflags = io_put_rw_kbuf(req); |
2669 | long res = req->result; | |
2670 | ||
2671 | if (*locked) { | |
2672 | struct io_ring_ctx *ctx = req->ctx; | |
2673 | struct io_submit_state *state = &ctx->submit_state; | |
2674 | ||
2675 | io_req_complete_state(req, res, cflags); | |
2676 | state->compl_reqs[state->compl_nr++] = req; | |
2677 | if (state->compl_nr == ARRAY_SIZE(state->compl_reqs)) | |
2678 | io_submit_flush_completions(ctx); | |
2679 | } else { | |
2680 | io_req_complete_post(req, res, cflags); | |
2681 | } | |
8ef12efe JA |
2682 | } |
2683 | ||
2684 | static void __io_complete_rw(struct io_kiocb *req, long res, long res2, | |
2685 | unsigned int issue_flags) | |
2686 | { | |
2687 | if (__io_complete_rw_common(req, res)) | |
2688 | return; | |
63637853 | 2689 | __io_req_complete(req, issue_flags, req->result, io_put_rw_kbuf(req)); |
ba816ad6 JA |
2690 | } |
2691 | ||
2692 | static void io_complete_rw(struct kiocb *kiocb, long res, long res2) | |
2693 | { | |
9adbd45d | 2694 | struct io_kiocb *req = container_of(kiocb, struct io_kiocb, rw.kiocb); |
ba816ad6 | 2695 | |
8ef12efe JA |
2696 | if (__io_complete_rw_common(req, res)) |
2697 | return; | |
2698 | req->result = res; | |
2699 | req->io_task_work.func = io_req_task_complete; | |
2700 | io_req_task_work_add(req); | |
2b188cc1 JA |
2701 | } |
2702 | ||
def596e9 JA |
2703 | static void io_complete_rw_iopoll(struct kiocb *kiocb, long res, long res2) |
2704 | { | |
9adbd45d | 2705 | struct io_kiocb *req = container_of(kiocb, struct io_kiocb, rw.kiocb); |
def596e9 | 2706 | |
491381ce JA |
2707 | if (kiocb->ki_flags & IOCB_WRITE) |
2708 | kiocb_end_write(req); | |
9532b99b | 2709 | if (unlikely(res != req->result)) { |
b66ceaf3 PB |
2710 | if (res == -EAGAIN && io_rw_should_reissue(req)) { |
2711 | req->flags |= REQ_F_REISSUE; | |
2712 | return; | |
9532b99b | 2713 | } |
8c130827 | 2714 | } |
bbde017a XW |
2715 | |
2716 | WRITE_ONCE(req->result, res); | |
b9b0e0d3 | 2717 | /* order with io_iopoll_complete() checking ->result */ |
cd664b0e PB |
2718 | smp_wmb(); |
2719 | WRITE_ONCE(req->iopoll_completed, 1); | |
def596e9 JA |
2720 | } |
2721 | ||
2722 | /* | |
2723 | * After the iocb has been issued, it's safe to be found on the poll list. | |
2724 | * Adding the kiocb to the list AFTER submission ensures that we don't | |
f39c8a5b | 2725 | * find it from a io_do_iopoll() thread before the issuer is done |
def596e9 JA |
2726 | * accessing the kiocb cookie. |
2727 | */ | |
cb3d8972 | 2728 | static void io_iopoll_req_issued(struct io_kiocb *req) |
def596e9 JA |
2729 | { |
2730 | struct io_ring_ctx *ctx = req->ctx; | |
cb3d8972 PB |
2731 | const bool in_async = io_wq_current_is_worker(); |
2732 | ||
2733 | /* workqueue context doesn't hold uring_lock, grab it now */ | |
2734 | if (unlikely(in_async)) | |
2735 | mutex_lock(&ctx->uring_lock); | |
def596e9 JA |
2736 | |
2737 | /* | |
2738 | * Track whether we have multiple files in our lists. This will impact | |
2739 | * how we do polling eventually, not spinning if we're on potentially | |
2740 | * different devices. | |
2741 | */ | |
540e32a0 | 2742 | if (list_empty(&ctx->iopoll_list)) { |
915b3dde HX |
2743 | ctx->poll_multi_queue = false; |
2744 | } else if (!ctx->poll_multi_queue) { | |
def596e9 | 2745 | struct io_kiocb *list_req; |
915b3dde | 2746 | unsigned int queue_num0, queue_num1; |
def596e9 | 2747 | |
540e32a0 | 2748 | list_req = list_first_entry(&ctx->iopoll_list, struct io_kiocb, |
d21ffe7e | 2749 | inflight_entry); |
915b3dde HX |
2750 | |
2751 | if (list_req->file != req->file) { | |
2752 | ctx->poll_multi_queue = true; | |
2753 | } else { | |
2754 | queue_num0 = blk_qc_t_to_queue_num(list_req->rw.kiocb.ki_cookie); | |
2755 | queue_num1 = blk_qc_t_to_queue_num(req->rw.kiocb.ki_cookie); | |
2756 | if (queue_num0 != queue_num1) | |
2757 | ctx->poll_multi_queue = true; | |
2758 | } | |
def596e9 JA |
2759 | } |
2760 | ||
2761 | /* | |
2762 | * For fast devices, IO may have already completed. If it has, add | |
2763 | * it to the front so we find it first. | |
2764 | */ | |
65a6543d | 2765 | if (READ_ONCE(req->iopoll_completed)) |
d21ffe7e | 2766 | list_add(&req->inflight_entry, &ctx->iopoll_list); |
def596e9 | 2767 | else |
d21ffe7e | 2768 | list_add_tail(&req->inflight_entry, &ctx->iopoll_list); |
bdcd3eab | 2769 | |
cb3d8972 PB |
2770 | if (unlikely(in_async)) { |
2771 | /* | |
2772 | * If IORING_SETUP_SQPOLL is enabled, sqes are either handle | |
2773 | * in sq thread task context or in io worker task context. If | |
2774 | * current task context is sq thread, we don't need to check | |
2775 | * whether should wake up sq thread. | |
2776 | */ | |
2777 | if ((ctx->flags & IORING_SETUP_SQPOLL) && | |
2778 | wq_has_sleeper(&ctx->sq_data->wait)) | |
2779 | wake_up(&ctx->sq_data->wait); | |
2780 | ||
2781 | mutex_unlock(&ctx->uring_lock); | |
2782 | } | |
def596e9 JA |
2783 | } |
2784 | ||
4503b767 JA |
2785 | static bool io_bdev_nowait(struct block_device *bdev) |
2786 | { | |
9ba0d0c8 | 2787 | return !bdev || blk_queue_nowait(bdev_get_queue(bdev)); |
4503b767 JA |
2788 | } |
2789 | ||
2b188cc1 JA |
2790 | /* |
2791 | * If we tracked the file through the SCM inflight mechanism, we could support | |
2792 | * any file. For now, just ensure that anything potentially problematic is done | |
2793 | * inline. | |
2794 | */ | |
b191e2df | 2795 | static bool __io_file_supports_nowait(struct file *file, int rw) |
2b188cc1 JA |
2796 | { |
2797 | umode_t mode = file_inode(file)->i_mode; | |
2798 | ||
4503b767 | 2799 | if (S_ISBLK(mode)) { |
4e7b5671 CH |
2800 | if (IS_ENABLED(CONFIG_BLOCK) && |
2801 | io_bdev_nowait(I_BDEV(file->f_mapping->host))) | |
4503b767 JA |
2802 | return true; |
2803 | return false; | |
2804 | } | |
976517f1 | 2805 | if (S_ISSOCK(mode)) |
2b188cc1 | 2806 | return true; |
4503b767 | 2807 | if (S_ISREG(mode)) { |
4e7b5671 CH |
2808 | if (IS_ENABLED(CONFIG_BLOCK) && |
2809 | io_bdev_nowait(file->f_inode->i_sb->s_bdev) && | |
4503b767 JA |
2810 | file->f_op != &io_uring_fops) |
2811 | return true; | |
2812 | return false; | |
2813 | } | |
2b188cc1 | 2814 | |
c5b85625 JA |
2815 | /* any ->read/write should understand O_NONBLOCK */ |
2816 | if (file->f_flags & O_NONBLOCK) | |
2817 | return true; | |
2818 | ||
af197f50 JA |
2819 | if (!(file->f_mode & FMODE_NOWAIT)) |
2820 | return false; | |
2821 | ||
2822 | if (rw == READ) | |
2823 | return file->f_op->read_iter != NULL; | |
2824 | ||
2825 | return file->f_op->write_iter != NULL; | |
2b188cc1 JA |
2826 | } |
2827 | ||
b191e2df | 2828 | static bool io_file_supports_nowait(struct io_kiocb *req, int rw) |
7b29f92d | 2829 | { |
b191e2df | 2830 | if (rw == READ && (req->flags & REQ_F_NOWAIT_READ)) |
7b29f92d | 2831 | return true; |
b191e2df | 2832 | else if (rw == WRITE && (req->flags & REQ_F_NOWAIT_WRITE)) |
7b29f92d JA |
2833 | return true; |
2834 | ||
b191e2df | 2835 | return __io_file_supports_nowait(req->file, rw); |
7b29f92d JA |
2836 | } |
2837 | ||
5d329e12 JA |
2838 | static int io_prep_rw(struct io_kiocb *req, const struct io_uring_sqe *sqe, |
2839 | int rw) | |
2b188cc1 | 2840 | { |
def596e9 | 2841 | struct io_ring_ctx *ctx = req->ctx; |
9adbd45d | 2842 | struct kiocb *kiocb = &req->rw.kiocb; |
75c668cd | 2843 | struct file *file = req->file; |
09bb8394 JA |
2844 | unsigned ioprio; |
2845 | int ret; | |
2b188cc1 | 2846 | |
c97d8a0f | 2847 | if (!io_req_ffs_set(req) && S_ISREG(file_inode(file)->i_mode)) |
491381ce JA |
2848 | req->flags |= REQ_F_ISREG; |
2849 | ||
2b188cc1 | 2850 | kiocb->ki_pos = READ_ONCE(sqe->off); |
75c668cd | 2851 | if (kiocb->ki_pos == -1 && !(file->f_mode & FMODE_STREAM)) { |
ba04291e | 2852 | req->flags |= REQ_F_CUR_POS; |
75c668cd | 2853 | kiocb->ki_pos = file->f_pos; |
ba04291e | 2854 | } |
2b188cc1 | 2855 | kiocb->ki_hint = ki_hint_validate(file_write_hint(kiocb->ki_filp)); |
3e577dcd PB |
2856 | kiocb->ki_flags = iocb_flags(kiocb->ki_filp); |
2857 | ret = kiocb_set_rw_flags(kiocb, READ_ONCE(sqe->rw_flags)); | |
2858 | if (unlikely(ret)) | |
2859 | return ret; | |
2b188cc1 | 2860 | |
5d329e12 JA |
2861 | /* |
2862 | * If the file is marked O_NONBLOCK, still allow retry for it if it | |
2863 | * supports async. Otherwise it's impossible to use O_NONBLOCK files | |
2864 | * reliably. If not, or it IOCB_NOWAIT is set, don't retry. | |
2865 | */ | |
2866 | if ((kiocb->ki_flags & IOCB_NOWAIT) || | |
2867 | ((file->f_flags & O_NONBLOCK) && !io_file_supports_nowait(req, rw))) | |
75c668cd PB |
2868 | req->flags |= REQ_F_NOWAIT; |
2869 | ||
2b188cc1 JA |
2870 | ioprio = READ_ONCE(sqe->ioprio); |
2871 | if (ioprio) { | |
2872 | ret = ioprio_check_cap(ioprio); | |
2873 | if (ret) | |
09bb8394 | 2874 | return ret; |
2b188cc1 JA |
2875 | |
2876 | kiocb->ki_ioprio = ioprio; | |
2877 | } else | |
2878 | kiocb->ki_ioprio = get_current_ioprio(); | |
2879 | ||
def596e9 | 2880 | if (ctx->flags & IORING_SETUP_IOPOLL) { |
def596e9 JA |
2881 | if (!(kiocb->ki_flags & IOCB_DIRECT) || |
2882 | !kiocb->ki_filp->f_op->iopoll) | |
09bb8394 | 2883 | return -EOPNOTSUPP; |
2b188cc1 | 2884 | |
394918eb | 2885 | kiocb->ki_flags |= IOCB_HIPRI | IOCB_ALLOC_CACHE; |
def596e9 | 2886 | kiocb->ki_complete = io_complete_rw_iopoll; |
65a6543d | 2887 | req->iopoll_completed = 0; |
def596e9 | 2888 | } else { |
09bb8394 JA |
2889 | if (kiocb->ki_flags & IOCB_HIPRI) |
2890 | return -EINVAL; | |
def596e9 JA |
2891 | kiocb->ki_complete = io_complete_rw; |
2892 | } | |
9adbd45d | 2893 | |
eae071c9 PB |
2894 | if (req->opcode == IORING_OP_READ_FIXED || |
2895 | req->opcode == IORING_OP_WRITE_FIXED) { | |
2896 | req->imu = NULL; | |
2897 | io_req_set_rsrc_node(req); | |
2898 | } | |
2899 | ||
3529d8c2 JA |
2900 | req->rw.addr = READ_ONCE(sqe->addr); |
2901 | req->rw.len = READ_ONCE(sqe->len); | |
4f4eeba8 | 2902 | req->buf_index = READ_ONCE(sqe->buf_index); |
2b188cc1 | 2903 | return 0; |
2b188cc1 JA |
2904 | } |
2905 | ||
2906 | static inline void io_rw_done(struct kiocb *kiocb, ssize_t ret) | |
2907 | { | |
2908 | switch (ret) { | |
2909 | case -EIOCBQUEUED: | |
2910 | break; | |
2911 | case -ERESTARTSYS: | |
2912 | case -ERESTARTNOINTR: | |
2913 | case -ERESTARTNOHAND: | |
2914 | case -ERESTART_RESTARTBLOCK: | |
2915 | /* | |
2916 | * We can't just restart the syscall, since previously | |
2917 | * submitted sqes may already be in progress. Just fail this | |
2918 | * IO with EINTR. | |
2919 | */ | |
2920 | ret = -EINTR; | |
df561f66 | 2921 | fallthrough; |
2b188cc1 JA |
2922 | default: |
2923 | kiocb->ki_complete(kiocb, ret, 0); | |
2924 | } | |
2925 | } | |
2926 | ||
a1d7c393 | 2927 | static void kiocb_done(struct kiocb *kiocb, ssize_t ret, |
889fca73 | 2928 | unsigned int issue_flags) |
ba816ad6 | 2929 | { |
ba04291e | 2930 | struct io_kiocb *req = container_of(kiocb, struct io_kiocb, rw.kiocb); |
e8c2bc1f | 2931 | struct io_async_rw *io = req->async_data; |
ba04291e | 2932 | |
227c0c96 | 2933 | /* add previously done IO, if any */ |
e8c2bc1f | 2934 | if (io && io->bytes_done > 0) { |
227c0c96 | 2935 | if (ret < 0) |
e8c2bc1f | 2936 | ret = io->bytes_done; |
227c0c96 | 2937 | else |
e8c2bc1f | 2938 | ret += io->bytes_done; |
227c0c96 JA |
2939 | } |
2940 | ||
ba04291e JA |
2941 | if (req->flags & REQ_F_CUR_POS) |
2942 | req->file->f_pos = kiocb->ki_pos; | |
b66ceaf3 | 2943 | if (ret >= 0 && (kiocb->ki_complete == io_complete_rw)) |
889fca73 | 2944 | __io_complete_rw(req, ret, 0, issue_flags); |
ba816ad6 JA |
2945 | else |
2946 | io_rw_done(kiocb, ret); | |
97284637 | 2947 | |
b66ceaf3 | 2948 | if (req->flags & REQ_F_REISSUE) { |
97284637 | 2949 | req->flags &= ~REQ_F_REISSUE; |
a7be7c23 | 2950 | if (io_resubmit_prep(req)) { |
773af691 | 2951 | io_req_task_queue_reissue(req); |
8c130827 | 2952 | } else { |
b66ceaf3 PB |
2953 | unsigned int cflags = io_put_rw_kbuf(req); |
2954 | struct io_ring_ctx *ctx = req->ctx; | |
2955 | ||
93d2bcd2 | 2956 | req_set_fail(req); |
b66ceaf3 PB |
2957 | if (issue_flags & IO_URING_F_NONBLOCK) { |
2958 | mutex_lock(&ctx->uring_lock); | |
2959 | __io_req_complete(req, issue_flags, ret, cflags); | |
2960 | mutex_unlock(&ctx->uring_lock); | |
2961 | } else { | |
2962 | __io_req_complete(req, issue_flags, ret, cflags); | |
2963 | } | |
97284637 PB |
2964 | } |
2965 | } | |
ba816ad6 JA |
2966 | } |
2967 | ||
eae071c9 PB |
2968 | static int __io_import_fixed(struct io_kiocb *req, int rw, struct iov_iter *iter, |
2969 | struct io_mapped_ubuf *imu) | |
edafccee | 2970 | { |
9adbd45d | 2971 | size_t len = req->rw.len; |
75769e3f | 2972 | u64 buf_end, buf_addr = req->rw.addr; |
edafccee | 2973 | size_t offset; |
edafccee | 2974 | |
75769e3f | 2975 | if (unlikely(check_add_overflow(buf_addr, (u64)len, &buf_end))) |
edafccee JA |
2976 | return -EFAULT; |
2977 | /* not inside the mapped region */ | |
4751f53d | 2978 | if (unlikely(buf_addr < imu->ubuf || buf_end > imu->ubuf_end)) |
edafccee JA |
2979 | return -EFAULT; |
2980 | ||
2981 | /* | |
2982 | * May not be a start of buffer, set size appropriately | |
2983 | * and advance us to the beginning. | |
2984 | */ | |
2985 | offset = buf_addr - imu->ubuf; | |
2986 | iov_iter_bvec(iter, rw, imu->bvec, imu->nr_bvecs, offset + len); | |
bd11b3a3 JA |
2987 | |
2988 | if (offset) { | |
2989 | /* | |
2990 | * Don't use iov_iter_advance() here, as it's really slow for | |
2991 | * using the latter parts of a big fixed buffer - it iterates | |
2992 | * over each segment manually. We can cheat a bit here, because | |
2993 | * we know that: | |
2994 | * | |
2995 | * 1) it's a BVEC iter, we set it up | |
2996 | * 2) all bvecs are PAGE_SIZE in size, except potentially the | |
2997 | * first and last bvec | |
2998 | * | |
2999 | * So just find our index, and adjust the iterator afterwards. | |
3000 | * If the offset is within the first bvec (or the whole first | |
3001 | * bvec, just use iov_iter_advance(). This makes it easier | |
3002 | * since we can just skip the first segment, which may not | |
3003 | * be PAGE_SIZE aligned. | |
3004 | */ | |
3005 | const struct bio_vec *bvec = imu->bvec; | |
3006 | ||
3007 | if (offset <= bvec->bv_len) { | |
3008 | iov_iter_advance(iter, offset); | |
3009 | } else { | |
3010 | unsigned long seg_skip; | |
3011 | ||
3012 | /* skip first vec */ | |
3013 | offset -= bvec->bv_len; | |
3014 | seg_skip = 1 + (offset >> PAGE_SHIFT); | |
3015 | ||
3016 | iter->bvec = bvec + seg_skip; | |
3017 | iter->nr_segs -= seg_skip; | |
99c79f66 | 3018 | iter->count -= bvec->bv_len + offset; |
bd11b3a3 | 3019 | iter->iov_offset = offset & ~PAGE_MASK; |
bd11b3a3 JA |
3020 | } |
3021 | } | |
3022 | ||
847595de | 3023 | return 0; |
edafccee JA |
3024 | } |
3025 | ||
eae071c9 PB |
3026 | static int io_import_fixed(struct io_kiocb *req, int rw, struct iov_iter *iter) |
3027 | { | |
3028 | struct io_ring_ctx *ctx = req->ctx; | |
3029 | struct io_mapped_ubuf *imu = req->imu; | |
3030 | u16 index, buf_index = req->buf_index; | |
3031 | ||
3032 | if (likely(!imu)) { | |
3033 | if (unlikely(buf_index >= ctx->nr_user_bufs)) | |
3034 | return -EFAULT; | |
3035 | index = array_index_nospec(buf_index, ctx->nr_user_bufs); | |
3036 | imu = READ_ONCE(ctx->user_bufs[index]); | |
3037 | req->imu = imu; | |
3038 | } | |
3039 | return __io_import_fixed(req, rw, iter, imu); | |
3040 | } | |
3041 | ||
bcda7baa JA |
3042 | static void io_ring_submit_unlock(struct io_ring_ctx *ctx, bool needs_lock) |
3043 | { | |
3044 | if (needs_lock) | |
3045 | mutex_unlock(&ctx->uring_lock); | |
3046 | } | |
3047 | ||
3048 | static void io_ring_submit_lock(struct io_ring_ctx *ctx, bool needs_lock) | |
3049 | { | |
3050 | /* | |
3051 | * "Normal" inline submissions always hold the uring_lock, since we | |
3052 | * grab it from the system call. Same is true for the SQPOLL offload. | |
3053 | * The only exception is when we've detached the request and issue it | |
3054 | * from an async worker thread, grab the lock for that case. | |
3055 | */ | |
3056 | if (needs_lock) | |
3057 | mutex_lock(&ctx->uring_lock); | |
3058 | } | |
3059 | ||
3060 | static struct io_buffer *io_buffer_select(struct io_kiocb *req, size_t *len, | |
3061 | int bgid, struct io_buffer *kbuf, | |
3062 | bool needs_lock) | |
3063 | { | |
3064 | struct io_buffer *head; | |
3065 | ||
3066 | if (req->flags & REQ_F_BUFFER_SELECTED) | |
3067 | return kbuf; | |
3068 | ||
3069 | io_ring_submit_lock(req->ctx, needs_lock); | |
3070 | ||
3071 | lockdep_assert_held(&req->ctx->uring_lock); | |
3072 | ||
9e15c3a0 | 3073 | head = xa_load(&req->ctx->io_buffers, bgid); |
bcda7baa JA |
3074 | if (head) { |
3075 | if (!list_empty(&head->list)) { | |
3076 | kbuf = list_last_entry(&head->list, struct io_buffer, | |
3077 | list); | |
3078 | list_del(&kbuf->list); | |
3079 | } else { | |
3080 | kbuf = head; | |
9e15c3a0 | 3081 | xa_erase(&req->ctx->io_buffers, bgid); |
bcda7baa JA |
3082 | } |
3083 | if (*len > kbuf->len) | |
3084 | *len = kbuf->len; | |
3085 | } else { | |
3086 | kbuf = ERR_PTR(-ENOBUFS); | |
3087 | } | |
3088 | ||
3089 | io_ring_submit_unlock(req->ctx, needs_lock); | |
3090 | ||
3091 | return kbuf; | |
3092 | } | |
3093 | ||
4d954c25 JA |
3094 | static void __user *io_rw_buffer_select(struct io_kiocb *req, size_t *len, |
3095 | bool needs_lock) | |
3096 | { | |
3097 | struct io_buffer *kbuf; | |
4f4eeba8 | 3098 | u16 bgid; |
4d954c25 JA |
3099 | |
3100 | kbuf = (struct io_buffer *) (unsigned long) req->rw.addr; | |
4f4eeba8 | 3101 | bgid = req->buf_index; |
4d954c25 JA |
3102 | kbuf = io_buffer_select(req, len, bgid, kbuf, needs_lock); |
3103 | if (IS_ERR(kbuf)) | |
3104 | return kbuf; | |
3105 | req->rw.addr = (u64) (unsigned long) kbuf; | |
3106 | req->flags |= REQ_F_BUFFER_SELECTED; | |
3107 | return u64_to_user_ptr(kbuf->addr); | |
3108 | } | |
3109 | ||
3110 | #ifdef CONFIG_COMPAT | |
3111 | static ssize_t io_compat_import(struct io_kiocb *req, struct iovec *iov, | |
3112 | bool needs_lock) | |
3113 | { | |
3114 | struct compat_iovec __user *uiov; | |
3115 | compat_ssize_t clen; | |
3116 | void __user *buf; | |
3117 | ssize_t len; | |
3118 | ||
3119 | uiov = u64_to_user_ptr(req->rw.addr); | |
3120 | if (!access_ok(uiov, sizeof(*uiov))) | |
3121 | return -EFAULT; | |
3122 | if (__get_user(clen, &uiov->iov_len)) | |
3123 | return -EFAULT; | |
3124 | if (clen < 0) | |
3125 | return -EINVAL; | |
3126 | ||
3127 | len = clen; | |
3128 | buf = io_rw_buffer_select(req, &len, needs_lock); | |
3129 | if (IS_ERR(buf)) | |
3130 | return PTR_ERR(buf); | |
3131 | iov[0].iov_base = buf; | |
3132 | iov[0].iov_len = (compat_size_t) len; | |
3133 | return 0; | |
3134 | } | |
3135 | #endif | |
3136 | ||
3137 | static ssize_t __io_iov_buffer_select(struct io_kiocb *req, struct iovec *iov, | |
3138 | bool needs_lock) | |
3139 | { | |
3140 | struct iovec __user *uiov = u64_to_user_ptr(req->rw.addr); | |
3141 | void __user *buf; | |
3142 | ssize_t len; | |
3143 | ||
3144 | if (copy_from_user(iov, uiov, sizeof(*uiov))) | |
3145 | return -EFAULT; | |
3146 | ||
3147 | len = iov[0].iov_len; | |
3148 | if (len < 0) | |
3149 | return -EINVAL; | |
3150 | buf = io_rw_buffer_select(req, &len, needs_lock); | |
3151 | if (IS_ERR(buf)) | |
3152 | return PTR_ERR(buf); | |
3153 | iov[0].iov_base = buf; | |
3154 | iov[0].iov_len = len; | |
3155 | return 0; | |
3156 | } | |
3157 | ||
3158 | static ssize_t io_iov_buffer_select(struct io_kiocb *req, struct iovec *iov, | |
3159 | bool needs_lock) | |
3160 | { | |
dddb3e26 JA |
3161 | if (req->flags & REQ_F_BUFFER_SELECTED) { |
3162 | struct io_buffer *kbuf; | |
3163 | ||
3164 | kbuf = (struct io_buffer *) (unsigned long) req->rw.addr; | |
3165 | iov[0].iov_base = u64_to_user_ptr(kbuf->addr); | |
3166 | iov[0].iov_len = kbuf->len; | |
4d954c25 | 3167 | return 0; |
dddb3e26 | 3168 | } |
dd201662 | 3169 | if (req->rw.len != 1) |
4d954c25 JA |
3170 | return -EINVAL; |
3171 | ||
3172 | #ifdef CONFIG_COMPAT | |
3173 | if (req->ctx->compat) | |
3174 | return io_compat_import(req, iov, needs_lock); | |
3175 | #endif | |
3176 | ||
3177 | return __io_iov_buffer_select(req, iov, needs_lock); | |
3178 | } | |
3179 | ||
847595de PB |
3180 | static int io_import_iovec(int rw, struct io_kiocb *req, struct iovec **iovec, |
3181 | struct iov_iter *iter, bool needs_lock) | |
2b188cc1 | 3182 | { |
9adbd45d JA |
3183 | void __user *buf = u64_to_user_ptr(req->rw.addr); |
3184 | size_t sqe_len = req->rw.len; | |
847595de | 3185 | u8 opcode = req->opcode; |
4d954c25 | 3186 | ssize_t ret; |
edafccee | 3187 | |
7d009165 | 3188 | if (opcode == IORING_OP_READ_FIXED || opcode == IORING_OP_WRITE_FIXED) { |
edafccee | 3189 | *iovec = NULL; |
9adbd45d | 3190 | return io_import_fixed(req, rw, iter); |
edafccee | 3191 | } |
2b188cc1 | 3192 | |
bcda7baa | 3193 | /* buffer index only valid with fixed read/write, or buffer select */ |
4f4eeba8 | 3194 | if (req->buf_index && !(req->flags & REQ_F_BUFFER_SELECT)) |
9adbd45d JA |
3195 | return -EINVAL; |
3196 | ||
3a6820f2 | 3197 | if (opcode == IORING_OP_READ || opcode == IORING_OP_WRITE) { |
bcda7baa | 3198 | if (req->flags & REQ_F_BUFFER_SELECT) { |
4d954c25 | 3199 | buf = io_rw_buffer_select(req, &sqe_len, needs_lock); |
867a23ea | 3200 | if (IS_ERR(buf)) |
4d954c25 | 3201 | return PTR_ERR(buf); |
3f9d6441 | 3202 | req->rw.len = sqe_len; |
bcda7baa JA |
3203 | } |
3204 | ||
3a6820f2 JA |
3205 | ret = import_single_range(rw, buf, sqe_len, *iovec, iter); |
3206 | *iovec = NULL; | |
10fc72e4 | 3207 | return ret; |
3a6820f2 JA |
3208 | } |
3209 | ||
4d954c25 JA |
3210 | if (req->flags & REQ_F_BUFFER_SELECT) { |
3211 | ret = io_iov_buffer_select(req, *iovec, needs_lock); | |
847595de PB |
3212 | if (!ret) |
3213 | iov_iter_init(iter, rw, *iovec, 1, (*iovec)->iov_len); | |
4d954c25 JA |
3214 | *iovec = NULL; |
3215 | return ret; | |
3216 | } | |
3217 | ||
89cd35c5 CH |
3218 | return __import_iovec(rw, buf, sqe_len, UIO_FASTIOV, iovec, iter, |
3219 | req->ctx->compat); | |
2b188cc1 JA |
3220 | } |
3221 | ||
0fef9483 JA |
3222 | static inline loff_t *io_kiocb_ppos(struct kiocb *kiocb) |
3223 | { | |
5b09e37e | 3224 | return (kiocb->ki_filp->f_mode & FMODE_STREAM) ? NULL : &kiocb->ki_pos; |
0fef9483 JA |
3225 | } |
3226 | ||
31b51510 | 3227 | /* |
32960613 JA |
3228 | * For files that don't have ->read_iter() and ->write_iter(), handle them |
3229 | * by looping over ->read() or ->write() manually. | |
31b51510 | 3230 | */ |
4017eb91 | 3231 | static ssize_t loop_rw_iter(int rw, struct io_kiocb *req, struct iov_iter *iter) |
32960613 | 3232 | { |
4017eb91 JA |
3233 | struct kiocb *kiocb = &req->rw.kiocb; |
3234 | struct file *file = req->file; | |
32960613 JA |
3235 | ssize_t ret = 0; |
3236 | ||
3237 | /* | |
3238 | * Don't support polled IO through this interface, and we can't | |
3239 | * support non-blocking either. For the latter, this just causes | |
3240 | * the kiocb to be handled from an async context. | |
3241 | */ | |
3242 | if (kiocb->ki_flags & IOCB_HIPRI) | |
3243 | return -EOPNOTSUPP; | |
3244 | if (kiocb->ki_flags & IOCB_NOWAIT) | |
3245 | return -EAGAIN; | |
3246 | ||
3247 | while (iov_iter_count(iter)) { | |
311ae9e1 | 3248 | struct iovec iovec; |
32960613 JA |
3249 | ssize_t nr; |
3250 | ||
311ae9e1 PB |
3251 | if (!iov_iter_is_bvec(iter)) { |
3252 | iovec = iov_iter_iovec(iter); | |
3253 | } else { | |
4017eb91 JA |
3254 | iovec.iov_base = u64_to_user_ptr(req->rw.addr); |
3255 | iovec.iov_len = req->rw.len; | |
311ae9e1 PB |
3256 | } |
3257 | ||
32960613 JA |
3258 | if (rw == READ) { |
3259 | nr = file->f_op->read(file, iovec.iov_base, | |
0fef9483 | 3260 | iovec.iov_len, io_kiocb_ppos(kiocb)); |
32960613 JA |
3261 | } else { |
3262 | nr = file->f_op->write(file, iovec.iov_base, | |
0fef9483 | 3263 | iovec.iov_len, io_kiocb_ppos(kiocb)); |
32960613 JA |
3264 | } |
3265 | ||
3266 | if (nr < 0) { | |
3267 | if (!ret) | |
3268 | ret = nr; | |
3269 | break; | |
3270 | } | |
16c8d2df JA |
3271 | if (!iov_iter_is_bvec(iter)) { |
3272 | iov_iter_advance(iter, nr); | |
3273 | } else { | |
3274 | req->rw.len -= nr; | |
3275 | req->rw.addr += nr; | |
3276 | } | |
32960613 JA |
3277 | ret += nr; |
3278 | if (nr != iovec.iov_len) | |
3279 | break; | |
32960613 JA |
3280 | } |
3281 | ||
3282 | return ret; | |
3283 | } | |
3284 | ||
ff6165b2 JA |
3285 | static void io_req_map_rw(struct io_kiocb *req, const struct iovec *iovec, |
3286 | const struct iovec *fast_iov, struct iov_iter *iter) | |
f67676d1 | 3287 | { |
e8c2bc1f | 3288 | struct io_async_rw *rw = req->async_data; |
b64e3444 | 3289 | |
ff6165b2 | 3290 | memcpy(&rw->iter, iter, sizeof(*iter)); |
afb87658 | 3291 | rw->free_iovec = iovec; |
227c0c96 | 3292 | rw->bytes_done = 0; |
ff6165b2 | 3293 | /* can only be fixed buffers, no need to do anything */ |
9c3a205c | 3294 | if (iov_iter_is_bvec(iter)) |
ff6165b2 | 3295 | return; |
b64e3444 | 3296 | if (!iovec) { |
ff6165b2 JA |
3297 | unsigned iov_off = 0; |
3298 | ||
3299 | rw->iter.iov = rw->fast_iov; | |
3300 | if (iter->iov != fast_iov) { | |
3301 | iov_off = iter->iov - fast_iov; | |
3302 | rw->iter.iov += iov_off; | |
3303 | } | |
3304 | if (rw->fast_iov != fast_iov) | |
3305 | memcpy(rw->fast_iov + iov_off, fast_iov + iov_off, | |
45097dae | 3306 | sizeof(struct iovec) * iter->nr_segs); |
99bc4c38 PB |
3307 | } else { |
3308 | req->flags |= REQ_F_NEED_CLEANUP; | |
f67676d1 JA |
3309 | } |
3310 | } | |
3311 | ||
6cb78689 | 3312 | static inline int io_alloc_async_data(struct io_kiocb *req) |
3d9932a8 | 3313 | { |
e8c2bc1f JA |
3314 | WARN_ON_ONCE(!io_op_defs[req->opcode].async_size); |
3315 | req->async_data = kmalloc(io_op_defs[req->opcode].async_size, GFP_KERNEL); | |
3316 | return req->async_data == NULL; | |
3d9932a8 XW |
3317 | } |
3318 | ||
ff6165b2 JA |
3319 | static int io_setup_async_rw(struct io_kiocb *req, const struct iovec *iovec, |
3320 | const struct iovec *fast_iov, | |
227c0c96 | 3321 | struct iov_iter *iter, bool force) |
b7bb4f7d | 3322 | { |
26f0505a | 3323 | if (!force && !io_op_defs[req->opcode].needs_async_setup) |
74566df3 | 3324 | return 0; |
e8c2bc1f | 3325 | if (!req->async_data) { |
cd658695 JA |
3326 | struct io_async_rw *iorw; |
3327 | ||
6cb78689 | 3328 | if (io_alloc_async_data(req)) { |
6bf985dc | 3329 | kfree(iovec); |
5d204bcf | 3330 | return -ENOMEM; |
6bf985dc | 3331 | } |
b7bb4f7d | 3332 | |
ff6165b2 | 3333 | io_req_map_rw(req, iovec, fast_iov, iter); |
cd658695 JA |
3334 | iorw = req->async_data; |
3335 | /* we've copied and mapped the iter, ensure state is saved */ | |
3336 | iov_iter_save_state(&iorw->iter, &iorw->iter_state); | |
5d204bcf | 3337 | } |
b7bb4f7d | 3338 | return 0; |
f67676d1 JA |
3339 | } |
3340 | ||
73debe68 | 3341 | static inline int io_rw_prep_async(struct io_kiocb *req, int rw) |
c3e330a4 | 3342 | { |
e8c2bc1f | 3343 | struct io_async_rw *iorw = req->async_data; |
f4bff104 | 3344 | struct iovec *iov = iorw->fast_iov; |
847595de | 3345 | int ret; |
c3e330a4 | 3346 | |
2846c481 | 3347 | ret = io_import_iovec(rw, req, &iov, &iorw->iter, false); |
c3e330a4 PB |
3348 | if (unlikely(ret < 0)) |
3349 | return ret; | |
3350 | ||
ab0b196c PB |
3351 | iorw->bytes_done = 0; |
3352 | iorw->free_iovec = iov; | |
3353 | if (iov) | |
3354 | req->flags |= REQ_F_NEED_CLEANUP; | |
cd658695 | 3355 | iov_iter_save_state(&iorw->iter, &iorw->iter_state); |
c3e330a4 PB |
3356 | return 0; |
3357 | } | |
3358 | ||
73debe68 | 3359 | static int io_read_prep(struct io_kiocb *req, const struct io_uring_sqe *sqe) |
f67676d1 | 3360 | { |
3529d8c2 JA |
3361 | if (unlikely(!(req->file->f_mode & FMODE_READ))) |
3362 | return -EBADF; | |
5d329e12 | 3363 | return io_prep_rw(req, sqe, READ); |
f67676d1 JA |
3364 | } |
3365 | ||
c1dd91d1 JA |
3366 | /* |
3367 | * This is our waitqueue callback handler, registered through lock_page_async() | |
3368 | * when we initially tried to do the IO with the iocb armed our waitqueue. | |
3369 | * This gets called when the page is unlocked, and we generally expect that to | |
3370 | * happen when the page IO is completed and the page is now uptodate. This will | |
3371 | * queue a task_work based retry of the operation, attempting to copy the data | |
3372 | * again. If the latter fails because the page was NOT uptodate, then we will | |
3373 | * do a thread based blocking retry of the operation. That's the unexpected | |
3374 | * slow path. | |
3375 | */ | |
bcf5a063 JA |
3376 | static int io_async_buf_func(struct wait_queue_entry *wait, unsigned mode, |
3377 | int sync, void *arg) | |
3378 | { | |
3379 | struct wait_page_queue *wpq; | |
3380 | struct io_kiocb *req = wait->private; | |
bcf5a063 | 3381 | struct wait_page_key *key = arg; |
bcf5a063 JA |
3382 | |
3383 | wpq = container_of(wait, struct wait_page_queue, wait); | |
3384 | ||
cdc8fcb4 LT |
3385 | if (!wake_page_match(wpq, key)) |
3386 | return 0; | |
3387 | ||
c8d317aa | 3388 | req->rw.kiocb.ki_flags &= ~IOCB_WAITQ; |
bcf5a063 | 3389 | list_del_init(&wait->entry); |
921b9054 | 3390 | io_req_task_queue(req); |
bcf5a063 JA |
3391 | return 1; |
3392 | } | |
3393 | ||
c1dd91d1 JA |
3394 | /* |
3395 | * This controls whether a given IO request should be armed for async page | |
3396 | * based retry. If we return false here, the request is handed to the async | |
3397 | * worker threads for retry. If we're doing buffered reads on a regular file, | |
3398 | * we prepare a private wait_page_queue entry and retry the operation. This | |
3399 | * will either succeed because the page is now uptodate and unlocked, or it | |
3400 | * will register a callback when the page is unlocked at IO completion. Through | |
3401 | * that callback, io_uring uses task_work to setup a retry of the operation. | |
3402 | * That retry will attempt the buffered read again. The retry will generally | |
3403 | * succeed, or in rare cases where it fails, we then fall back to using the | |
3404 | * async worker threads for a blocking retry. | |
3405 | */ | |
227c0c96 | 3406 | static bool io_rw_should_retry(struct io_kiocb *req) |
f67676d1 | 3407 | { |
e8c2bc1f JA |
3408 | struct io_async_rw *rw = req->async_data; |
3409 | struct wait_page_queue *wait = &rw->wpq; | |
bcf5a063 | 3410 | struct kiocb *kiocb = &req->rw.kiocb; |
f67676d1 | 3411 | |
bcf5a063 JA |
3412 | /* never retry for NOWAIT, we just complete with -EAGAIN */ |
3413 | if (req->flags & REQ_F_NOWAIT) | |
3414 | return false; | |
f67676d1 | 3415 | |
227c0c96 | 3416 | /* Only for buffered IO */ |
3b2a4439 | 3417 | if (kiocb->ki_flags & (IOCB_DIRECT | IOCB_HIPRI)) |
bcf5a063 | 3418 | return false; |
3b2a4439 | 3419 | |
bcf5a063 JA |
3420 | /* |
3421 | * just use poll if we can, and don't attempt if the fs doesn't | |
3422 | * support callback based unlocks | |
3423 | */ | |
3424 | if (file_can_poll(req->file) || !(req->file->f_mode & FMODE_BUF_RASYNC)) | |
3425 | return false; | |
f67676d1 | 3426 | |
3b2a4439 JA |
3427 | wait->wait.func = io_async_buf_func; |
3428 | wait->wait.private = req; | |
3429 | wait->wait.flags = 0; | |
3430 | INIT_LIST_HEAD(&wait->wait.entry); | |
3431 | kiocb->ki_flags |= IOCB_WAITQ; | |
c8d317aa | 3432 | kiocb->ki_flags &= ~IOCB_NOWAIT; |
3b2a4439 | 3433 | kiocb->ki_waitq = wait; |
3b2a4439 | 3434 | return true; |
bcf5a063 JA |
3435 | } |
3436 | ||
aeab9506 | 3437 | static inline int io_iter_do_read(struct io_kiocb *req, struct iov_iter *iter) |
bcf5a063 JA |
3438 | { |
3439 | if (req->file->f_op->read_iter) | |
3440 | return call_read_iter(req->file, &req->rw.kiocb, iter); | |
2dd2111d | 3441 | else if (req->file->f_op->read) |
4017eb91 | 3442 | return loop_rw_iter(READ, req, iter); |
2dd2111d GH |
3443 | else |
3444 | return -EINVAL; | |
f67676d1 JA |
3445 | } |
3446 | ||
7db30437 ML |
3447 | static bool need_read_all(struct io_kiocb *req) |
3448 | { | |
3449 | return req->flags & REQ_F_ISREG || | |
3450 | S_ISBLK(file_inode(req->file)->i_mode); | |
3451 | } | |
3452 | ||
889fca73 | 3453 | static int io_read(struct io_kiocb *req, unsigned int issue_flags) |
2b188cc1 JA |
3454 | { |
3455 | struct iovec inline_vecs[UIO_FASTIOV], *iovec = inline_vecs; | |
9adbd45d | 3456 | struct kiocb *kiocb = &req->rw.kiocb; |
ff6165b2 | 3457 | struct iov_iter __iter, *iter = &__iter; |
e8c2bc1f | 3458 | struct io_async_rw *rw = req->async_data; |
45d189c6 | 3459 | bool force_nonblock = issue_flags & IO_URING_F_NONBLOCK; |
cd658695 JA |
3460 | struct iov_iter_state __state, *state; |
3461 | ssize_t ret, ret2; | |
ff6165b2 | 3462 | |
2846c481 | 3463 | if (rw) { |
e8c2bc1f | 3464 | iter = &rw->iter; |
cd658695 JA |
3465 | state = &rw->iter_state; |
3466 | /* | |
3467 | * We come here from an earlier attempt, restore our state to | |
3468 | * match in case it doesn't. It's cheap enough that we don't | |
3469 | * need to make this conditional. | |
3470 | */ | |
3471 | iov_iter_restore(iter, state); | |
2846c481 PB |
3472 | iovec = NULL; |
3473 | } else { | |
3474 | ret = io_import_iovec(READ, req, &iovec, iter, !force_nonblock); | |
3475 | if (ret < 0) | |
3476 | return ret; | |
cd658695 JA |
3477 | state = &__state; |
3478 | iov_iter_save_state(iter, state); | |
2846c481 | 3479 | } |
cd658695 | 3480 | req->result = iov_iter_count(iter); |
2b188cc1 | 3481 | |
fd6c2e4c JA |
3482 | /* Ensure we clear previously set non-block flag */ |
3483 | if (!force_nonblock) | |
29de5f6a | 3484 | kiocb->ki_flags &= ~IOCB_NOWAIT; |
a88fc400 PB |
3485 | else |
3486 | kiocb->ki_flags |= IOCB_NOWAIT; | |
3487 | ||
24c74678 | 3488 | /* If the file doesn't support async, just async punt */ |
b191e2df | 3489 | if (force_nonblock && !io_file_supports_nowait(req, READ)) { |
6713e7a6 | 3490 | ret = io_setup_async_rw(req, iovec, inline_vecs, iter, true); |
6bf985dc | 3491 | return ret ?: -EAGAIN; |
6713e7a6 | 3492 | } |
9e645e11 | 3493 | |
cd658695 | 3494 | ret = rw_verify_area(READ, req->file, io_kiocb_ppos(kiocb), req->result); |
5ea5dd45 PB |
3495 | if (unlikely(ret)) { |
3496 | kfree(iovec); | |
3497 | return ret; | |
3498 | } | |
2b188cc1 | 3499 | |
227c0c96 | 3500 | ret = io_iter_do_read(req, iter); |
32960613 | 3501 | |
230d50d4 | 3502 | if (ret == -EAGAIN || (req->flags & REQ_F_REISSUE)) { |
6ad7f233 | 3503 | req->flags &= ~REQ_F_REISSUE; |
eefdf30f JA |
3504 | /* IOPOLL retry should happen for io-wq threads */ |
3505 | if (!force_nonblock && !(req->ctx->flags & IORING_SETUP_IOPOLL)) | |
f91daf56 | 3506 | goto done; |
75c668cd PB |
3507 | /* no retry on NONBLOCK nor RWF_NOWAIT */ |
3508 | if (req->flags & REQ_F_NOWAIT) | |
355afaeb | 3509 | goto done; |
f38c7e3a | 3510 | ret = 0; |
230d50d4 JA |
3511 | } else if (ret == -EIOCBQUEUED) { |
3512 | goto out_free; | |
cd658695 | 3513 | } else if (ret <= 0 || ret == req->result || !force_nonblock || |
7db30437 | 3514 | (req->flags & REQ_F_NOWAIT) || !need_read_all(req)) { |
7335e3bf | 3515 | /* read all, failed, already did sync or don't want to retry */ |
00d23d51 | 3516 | goto done; |
227c0c96 JA |
3517 | } |
3518 | ||
cd658695 JA |
3519 | /* |
3520 | * Don't depend on the iter state matching what was consumed, or being | |
3521 | * untouched in case of error. Restore it and we'll advance it | |
3522 | * manually if we need to. | |
3523 | */ | |
3524 | iov_iter_restore(iter, state); | |
3525 | ||
227c0c96 | 3526 | ret2 = io_setup_async_rw(req, iovec, inline_vecs, iter, true); |
6bf985dc PB |
3527 | if (ret2) |
3528 | return ret2; | |
3529 | ||
fe1cdd55 | 3530 | iovec = NULL; |
e8c2bc1f | 3531 | rw = req->async_data; |
cd658695 JA |
3532 | /* |
3533 | * Now use our persistent iterator and state, if we aren't already. | |
3534 | * We've restored and mapped the iter to match. | |
3535 | */ | |
3536 | if (iter != &rw->iter) { | |
3537 | iter = &rw->iter; | |
3538 | state = &rw->iter_state; | |
3539 | } | |
227c0c96 | 3540 | |
b23df91b | 3541 | do { |
cd658695 JA |
3542 | /* |
3543 | * We end up here because of a partial read, either from | |
3544 | * above or inside this loop. Advance the iter by the bytes | |
3545 | * that were consumed. | |
3546 | */ | |
3547 | iov_iter_advance(iter, ret); | |
3548 | if (!iov_iter_count(iter)) | |
3549 | break; | |
b23df91b | 3550 | rw->bytes_done += ret; |
cd658695 JA |
3551 | iov_iter_save_state(iter, state); |
3552 | ||
b23df91b PB |
3553 | /* if we can retry, do so with the callbacks armed */ |
3554 | if (!io_rw_should_retry(req)) { | |
3555 | kiocb->ki_flags &= ~IOCB_WAITQ; | |
3556 | return -EAGAIN; | |
3557 | } | |
3558 | ||
3559 | /* | |
3560 | * Now retry read with the IOCB_WAITQ parts set in the iocb. If | |
3561 | * we get -EIOCBQUEUED, then we'll get a notification when the | |
3562 | * desired page gets unlocked. We can also get a partial read | |
3563 | * here, and if we do, then just retry at the new offset. | |
3564 | */ | |
3565 | ret = io_iter_do_read(req, iter); | |
3566 | if (ret == -EIOCBQUEUED) | |
3567 | return 0; | |
227c0c96 | 3568 | /* we got some bytes, but not all. retry. */ |
b5b0ecb7 | 3569 | kiocb->ki_flags &= ~IOCB_WAITQ; |
cd658695 JA |
3570 | iov_iter_restore(iter, state); |
3571 | } while (ret > 0); | |
227c0c96 | 3572 | done: |
889fca73 | 3573 | kiocb_done(kiocb, ret, issue_flags); |
fe1cdd55 PB |
3574 | out_free: |
3575 | /* it's faster to check here then delegate to kfree */ | |
3576 | if (iovec) | |
3577 | kfree(iovec); | |
5ea5dd45 | 3578 | return 0; |
2b188cc1 JA |
3579 | } |
3580 | ||
73debe68 | 3581 | static int io_write_prep(struct io_kiocb *req, const struct io_uring_sqe *sqe) |
f67676d1 | 3582 | { |
3529d8c2 JA |
3583 | if (unlikely(!(req->file->f_mode & FMODE_WRITE))) |
3584 | return -EBADF; | |
5d329e12 | 3585 | return io_prep_rw(req, sqe, WRITE); |
f67676d1 JA |
3586 | } |
3587 | ||
889fca73 | 3588 | static int io_write(struct io_kiocb *req, unsigned int issue_flags) |
2b188cc1 JA |
3589 | { |
3590 | struct iovec inline_vecs[UIO_FASTIOV], *iovec = inline_vecs; | |
9adbd45d | 3591 | struct kiocb *kiocb = &req->rw.kiocb; |
ff6165b2 | 3592 | struct iov_iter __iter, *iter = &__iter; |
e8c2bc1f | 3593 | struct io_async_rw *rw = req->async_data; |
45d189c6 | 3594 | bool force_nonblock = issue_flags & IO_URING_F_NONBLOCK; |
cd658695 JA |
3595 | struct iov_iter_state __state, *state; |
3596 | ssize_t ret, ret2; | |
2b188cc1 | 3597 | |
2846c481 | 3598 | if (rw) { |
e8c2bc1f | 3599 | iter = &rw->iter; |
cd658695 JA |
3600 | state = &rw->iter_state; |
3601 | iov_iter_restore(iter, state); | |
2846c481 PB |
3602 | iovec = NULL; |
3603 | } else { | |
3604 | ret = io_import_iovec(WRITE, req, &iovec, iter, !force_nonblock); | |
3605 | if (ret < 0) | |
3606 | return ret; | |
cd658695 JA |
3607 | state = &__state; |
3608 | iov_iter_save_state(iter, state); | |
2846c481 | 3609 | } |
cd658695 | 3610 | req->result = iov_iter_count(iter); |
2b188cc1 | 3611 | |
fd6c2e4c JA |
3612 | /* Ensure we clear previously set non-block flag */ |
3613 | if (!force_nonblock) | |
a88fc400 PB |
3614 | kiocb->ki_flags &= ~IOCB_NOWAIT; |
3615 | else | |
3616 | kiocb->ki_flags |= IOCB_NOWAIT; | |
fd6c2e4c | 3617 | |
24c74678 | 3618 | /* If the file doesn't support async, just async punt */ |
b191e2df | 3619 | if (force_nonblock && !io_file_supports_nowait(req, WRITE)) |
f67676d1 | 3620 | goto copy_iov; |
31b51510 | 3621 | |
10d59345 JA |
3622 | /* file path doesn't support NOWAIT for non-direct_IO */ |
3623 | if (force_nonblock && !(kiocb->ki_flags & IOCB_DIRECT) && | |
3624 | (req->flags & REQ_F_ISREG)) | |
f67676d1 | 3625 | goto copy_iov; |
31b51510 | 3626 | |
cd658695 | 3627 | ret = rw_verify_area(WRITE, req->file, io_kiocb_ppos(kiocb), req->result); |
fa15bafb PB |
3628 | if (unlikely(ret)) |
3629 | goto out_free; | |
4ed734b0 | 3630 | |
fa15bafb PB |
3631 | /* |
3632 | * Open-code file_start_write here to grab freeze protection, | |
3633 | * which will be released by another thread in | |
3634 | * io_complete_rw(). Fool lockdep by telling it the lock got | |
3635 | * released so that it doesn't complain about the held lock when | |
3636 | * we return to userspace. | |
3637 | */ | |
3638 | if (req->flags & REQ_F_ISREG) { | |
8a3c84b6 | 3639 | sb_start_write(file_inode(req->file)->i_sb); |
fa15bafb PB |
3640 | __sb_writers_release(file_inode(req->file)->i_sb, |
3641 | SB_FREEZE_WRITE); | |
3642 | } | |
3643 | kiocb->ki_flags |= IOCB_WRITE; | |
4ed734b0 | 3644 | |
fa15bafb | 3645 | if (req->file->f_op->write_iter) |
ff6165b2 | 3646 | ret2 = call_write_iter(req->file, kiocb, iter); |
2dd2111d | 3647 | else if (req->file->f_op->write) |
4017eb91 | 3648 | ret2 = loop_rw_iter(WRITE, req, iter); |
2dd2111d GH |
3649 | else |
3650 | ret2 = -EINVAL; | |
4ed734b0 | 3651 | |
6ad7f233 PB |
3652 | if (req->flags & REQ_F_REISSUE) { |
3653 | req->flags &= ~REQ_F_REISSUE; | |
230d50d4 | 3654 | ret2 = -EAGAIN; |
6ad7f233 | 3655 | } |
230d50d4 | 3656 | |
fa15bafb PB |
3657 | /* |
3658 | * Raw bdev writes will return -EOPNOTSUPP for IOCB_NOWAIT. Just | |
3659 | * retry them without IOCB_NOWAIT. | |
3660 | */ | |
3661 | if (ret2 == -EOPNOTSUPP && (kiocb->ki_flags & IOCB_NOWAIT)) | |
3662 | ret2 = -EAGAIN; | |
75c668cd PB |
3663 | /* no retry on NONBLOCK nor RWF_NOWAIT */ |
3664 | if (ret2 == -EAGAIN && (req->flags & REQ_F_NOWAIT)) | |
355afaeb | 3665 | goto done; |
fa15bafb | 3666 | if (!force_nonblock || ret2 != -EAGAIN) { |
eefdf30f JA |
3667 | /* IOPOLL retry should happen for io-wq threads */ |
3668 | if ((req->ctx->flags & IORING_SETUP_IOPOLL) && ret2 == -EAGAIN) | |
3669 | goto copy_iov; | |
355afaeb | 3670 | done: |
889fca73 | 3671 | kiocb_done(kiocb, ret2, issue_flags); |
fa15bafb | 3672 | } else { |
f67676d1 | 3673 | copy_iov: |
cd658695 | 3674 | iov_iter_restore(iter, state); |
227c0c96 | 3675 | ret = io_setup_async_rw(req, iovec, inline_vecs, iter, false); |
6bf985dc | 3676 | return ret ?: -EAGAIN; |
2b188cc1 | 3677 | } |
31b51510 | 3678 | out_free: |
f261c168 | 3679 | /* it's reportedly faster than delegating the null check to kfree() */ |
252917c3 | 3680 | if (iovec) |
6f2cc166 | 3681 | kfree(iovec); |
2b188cc1 JA |
3682 | return ret; |
3683 | } | |
3684 | ||
80a261fd JA |
3685 | static int io_renameat_prep(struct io_kiocb *req, |
3686 | const struct io_uring_sqe *sqe) | |
3687 | { | |
3688 | struct io_rename *ren = &req->rename; | |
3689 | const char __user *oldf, *newf; | |
3690 | ||
ed7eb259 JA |
3691 | if (unlikely(req->ctx->flags & IORING_SETUP_IOPOLL)) |
3692 | return -EINVAL; | |
26578cda | 3693 | if (sqe->ioprio || sqe->buf_index || sqe->splice_fd_in) |
ed7eb259 | 3694 | return -EINVAL; |
80a261fd JA |
3695 | if (unlikely(req->flags & REQ_F_FIXED_FILE)) |
3696 | return -EBADF; | |
3697 | ||
3698 | ren->old_dfd = READ_ONCE(sqe->fd); | |
3699 | oldf = u64_to_user_ptr(READ_ONCE(sqe->addr)); | |
3700 | newf = u64_to_user_ptr(READ_ONCE(sqe->addr2)); | |
3701 | ren->new_dfd = READ_ONCE(sqe->len); | |
3702 | ren->flags = READ_ONCE(sqe->rename_flags); | |
3703 | ||
3704 | ren->oldpath = getname(oldf); | |
3705 | if (IS_ERR(ren->oldpath)) | |
3706 | return PTR_ERR(ren->oldpath); | |
3707 | ||
3708 | ren->newpath = getname(newf); | |
3709 | if (IS_ERR(ren->newpath)) { | |
3710 | putname(ren->oldpath); | |
3711 | return PTR_ERR(ren->newpath); | |
3712 | } | |
3713 | ||
3714 | req->flags |= REQ_F_NEED_CLEANUP; | |
3715 | return 0; | |
3716 | } | |
3717 | ||
45d189c6 | 3718 | static int io_renameat(struct io_kiocb *req, unsigned int issue_flags) |
80a261fd JA |
3719 | { |
3720 | struct io_rename *ren = &req->rename; | |
3721 | int ret; | |
3722 | ||
45d189c6 | 3723 | if (issue_flags & IO_URING_F_NONBLOCK) |
80a261fd JA |
3724 | return -EAGAIN; |
3725 | ||
3726 | ret = do_renameat2(ren->old_dfd, ren->oldpath, ren->new_dfd, | |
3727 | ren->newpath, ren->flags); | |
3728 | ||
3729 | req->flags &= ~REQ_F_NEED_CLEANUP; | |
3730 | if (ret < 0) | |
93d2bcd2 | 3731 | req_set_fail(req); |
80a261fd JA |
3732 | io_req_complete(req, ret); |
3733 | return 0; | |
3734 | } | |
3735 | ||
14a1143b JA |
3736 | static int io_unlinkat_prep(struct io_kiocb *req, |
3737 | const struct io_uring_sqe *sqe) | |
3738 | { | |
3739 | struct io_unlink *un = &req->unlink; | |
3740 | const char __user *fname; | |
3741 | ||
22634bc5 JA |
3742 | if (unlikely(req->ctx->flags & IORING_SETUP_IOPOLL)) |
3743 | return -EINVAL; | |
26578cda PB |
3744 | if (sqe->ioprio || sqe->off || sqe->len || sqe->buf_index || |
3745 | sqe->splice_fd_in) | |
22634bc5 | 3746 | return -EINVAL; |
14a1143b JA |
3747 | if (unlikely(req->flags & REQ_F_FIXED_FILE)) |
3748 | return -EBADF; | |
3749 | ||
3750 | un->dfd = READ_ONCE(sqe->fd); | |
3751 | ||
3752 | un->flags = READ_ONCE(sqe->unlink_flags); | |
3753 | if (un->flags & ~AT_REMOVEDIR) | |
3754 | return -EINVAL; | |
3755 | ||
3756 | fname = u64_to_user_ptr(READ_ONCE(sqe->addr)); | |
3757 | un->filename = getname(fname); | |
3758 | if (IS_ERR(un->filename)) | |
3759 | return PTR_ERR(un->filename); | |
3760 | ||
3761 | req->flags |= REQ_F_NEED_CLEANUP; | |
3762 | return 0; | |
3763 | } | |
3764 | ||
45d189c6 | 3765 | static int io_unlinkat(struct io_kiocb *req, unsigned int issue_flags) |
14a1143b JA |
3766 | { |
3767 | struct io_unlink *un = &req->unlink; | |
3768 | int ret; | |
3769 | ||
45d189c6 | 3770 | if (issue_flags & IO_URING_F_NONBLOCK) |
14a1143b JA |
3771 | return -EAGAIN; |
3772 | ||
3773 | if (un->flags & AT_REMOVEDIR) | |
3774 | ret = do_rmdir(un->dfd, un->filename); | |
3775 | else | |
3776 | ret = do_unlinkat(un->dfd, un->filename); | |
3777 | ||
3778 | req->flags &= ~REQ_F_NEED_CLEANUP; | |
3779 | if (ret < 0) | |
93d2bcd2 | 3780 | req_set_fail(req); |
14a1143b JA |
3781 | io_req_complete(req, ret); |
3782 | return 0; | |
3783 | } | |
3784 | ||
e34a02dc DK |
3785 | static int io_mkdirat_prep(struct io_kiocb *req, |
3786 | const struct io_uring_sqe *sqe) | |
3787 | { | |
3788 | struct io_mkdir *mkd = &req->mkdir; | |
3789 | const char __user *fname; | |
3790 | ||
3791 | if (unlikely(req->ctx->flags & IORING_SETUP_IOPOLL)) | |
3792 | return -EINVAL; | |
3793 | if (sqe->ioprio || sqe->off || sqe->rw_flags || sqe->buf_index || | |
3794 | sqe->splice_fd_in) | |
3795 | return -EINVAL; | |
3796 | if (unlikely(req->flags & REQ_F_FIXED_FILE)) | |
3797 | return -EBADF; | |
3798 | ||
3799 | mkd->dfd = READ_ONCE(sqe->fd); | |
3800 | mkd->mode = READ_ONCE(sqe->len); | |
3801 | ||
3802 | fname = u64_to_user_ptr(READ_ONCE(sqe->addr)); | |
3803 | mkd->filename = getname(fname); | |
3804 | if (IS_ERR(mkd->filename)) | |
3805 | return PTR_ERR(mkd->filename); | |
3806 | ||
3807 | req->flags |= REQ_F_NEED_CLEANUP; | |
3808 | return 0; | |
3809 | } | |
3810 | ||
3811 | static int io_mkdirat(struct io_kiocb *req, int issue_flags) | |
3812 | { | |
3813 | struct io_mkdir *mkd = &req->mkdir; | |
3814 | int ret; | |
3815 | ||
3816 | if (issue_flags & IO_URING_F_NONBLOCK) | |
3817 | return -EAGAIN; | |
3818 | ||
3819 | ret = do_mkdirat(mkd->dfd, mkd->filename, mkd->mode); | |
3820 | ||
3821 | req->flags &= ~REQ_F_NEED_CLEANUP; | |
3822 | if (ret < 0) | |
3823 | req_set_fail(req); | |
3824 | io_req_complete(req, ret); | |
3825 | return 0; | |
3826 | } | |
3827 | ||
7a8721f8 DK |
3828 | static int io_symlinkat_prep(struct io_kiocb *req, |
3829 | const struct io_uring_sqe *sqe) | |
3830 | { | |
3831 | struct io_symlink *sl = &req->symlink; | |
3832 | const char __user *oldpath, *newpath; | |
3833 | ||
3834 | if (unlikely(req->ctx->flags & IORING_SETUP_IOPOLL)) | |
3835 | return -EINVAL; | |
3836 | if (sqe->ioprio || sqe->len || sqe->rw_flags || sqe->buf_index || | |
3837 | sqe->splice_fd_in) | |
3838 | return -EINVAL; | |
3839 | if (unlikely(req->flags & REQ_F_FIXED_FILE)) | |
3840 | return -EBADF; | |
3841 | ||
3842 | sl->new_dfd = READ_ONCE(sqe->fd); | |
3843 | oldpath = u64_to_user_ptr(READ_ONCE(sqe->addr)); | |
3844 | newpath = u64_to_user_ptr(READ_ONCE(sqe->addr2)); | |
3845 | ||
3846 | sl->oldpath = getname(oldpath); | |
3847 | if (IS_ERR(sl->oldpath)) | |
3848 | return PTR_ERR(sl->oldpath); | |
3849 | ||
3850 | sl->newpath = getname(newpath); | |
3851 | if (IS_ERR(sl->newpath)) { | |
3852 | putname(sl->oldpath); | |
3853 | return PTR_ERR(sl->newpath); | |
3854 | } | |
3855 | ||
3856 | req->flags |= REQ_F_NEED_CLEANUP; | |
3857 | return 0; | |
3858 | } | |
3859 | ||
3860 | static int io_symlinkat(struct io_kiocb *req, int issue_flags) | |
3861 | { | |
3862 | struct io_symlink *sl = &req->symlink; | |
3863 | int ret; | |
3864 | ||
3865 | if (issue_flags & IO_URING_F_NONBLOCK) | |
3866 | return -EAGAIN; | |
3867 | ||
3868 | ret = do_symlinkat(sl->oldpath, sl->new_dfd, sl->newpath); | |
3869 | ||
3870 | req->flags &= ~REQ_F_NEED_CLEANUP; | |
3871 | if (ret < 0) | |
3872 | req_set_fail(req); | |
3873 | io_req_complete(req, ret); | |
3874 | return 0; | |
3875 | } | |
3876 | ||
cf30da90 DK |
3877 | static int io_linkat_prep(struct io_kiocb *req, |
3878 | const struct io_uring_sqe *sqe) | |
3879 | { | |
3880 | struct io_hardlink *lnk = &req->hardlink; | |
3881 | const char __user *oldf, *newf; | |
3882 | ||
3883 | if (unlikely(req->ctx->flags & IORING_SETUP_IOPOLL)) | |
3884 | return -EINVAL; | |
3885 | if (sqe->ioprio || sqe->rw_flags || sqe->buf_index || sqe->splice_fd_in) | |
3886 | return -EINVAL; | |
3887 | if (unlikely(req->flags & REQ_F_FIXED_FILE)) | |
3888 | return -EBADF; | |
3889 | ||
3890 | lnk->old_dfd = READ_ONCE(sqe->fd); | |
3891 | lnk->new_dfd = READ_ONCE(sqe->len); | |
3892 | oldf = u64_to_user_ptr(READ_ONCE(sqe->addr)); | |
3893 | newf = u64_to_user_ptr(READ_ONCE(sqe->addr2)); | |
3894 | lnk->flags = READ_ONCE(sqe->hardlink_flags); | |
3895 | ||
3896 | lnk->oldpath = getname(oldf); | |
3897 | if (IS_ERR(lnk->oldpath)) | |
3898 | return PTR_ERR(lnk->oldpath); | |
3899 | ||
3900 | lnk->newpath = getname(newf); | |
3901 | if (IS_ERR(lnk->newpath)) { | |
3902 | putname(lnk->oldpath); | |
3903 | return PTR_ERR(lnk->newpath); | |
3904 | } | |
3905 | ||
3906 | req->flags |= REQ_F_NEED_CLEANUP; | |
3907 | return 0; | |
3908 | } | |
3909 | ||
3910 | static int io_linkat(struct io_kiocb *req, int issue_flags) | |
3911 | { | |
3912 | struct io_hardlink *lnk = &req->hardlink; | |
3913 | int ret; | |
3914 | ||
3915 | if (issue_flags & IO_URING_F_NONBLOCK) | |
3916 | return -EAGAIN; | |
3917 | ||
3918 | ret = do_linkat(lnk->old_dfd, lnk->oldpath, lnk->new_dfd, | |
3919 | lnk->newpath, lnk->flags); | |
3920 | ||
3921 | req->flags &= ~REQ_F_NEED_CLEANUP; | |
3922 | if (ret < 0) | |
3923 | req_set_fail(req); | |
3924 | io_req_complete(req, ret); | |
3925 | return 0; | |
3926 | } | |
3927 | ||
36f4fa68 JA |
3928 | static int io_shutdown_prep(struct io_kiocb *req, |
3929 | const struct io_uring_sqe *sqe) | |
3930 | { | |
3931 | #if defined(CONFIG_NET) | |
3932 | if (unlikely(req->ctx->flags & IORING_SETUP_IOPOLL)) | |
3933 | return -EINVAL; | |
26578cda PB |
3934 | if (unlikely(sqe->ioprio || sqe->off || sqe->addr || sqe->rw_flags || |
3935 | sqe->buf_index || sqe->splice_fd_in)) | |
36f4fa68 JA |
3936 | return -EINVAL; |
3937 | ||
3938 | req->shutdown.how = READ_ONCE(sqe->len); | |
3939 | return 0; | |
3940 | #else | |
3941 | return -EOPNOTSUPP; | |
3942 | #endif | |
3943 | } | |
3944 | ||
45d189c6 | 3945 | static int io_shutdown(struct io_kiocb *req, unsigned int issue_flags) |
36f4fa68 JA |
3946 | { |
3947 | #if defined(CONFIG_NET) | |
3948 | struct socket *sock; | |
3949 | int ret; | |
3950 | ||
45d189c6 | 3951 | if (issue_flags & IO_URING_F_NONBLOCK) |
36f4fa68 JA |
3952 | return -EAGAIN; |
3953 | ||
48aba79b | 3954 | sock = sock_from_file(req->file); |
36f4fa68 | 3955 | if (unlikely(!sock)) |
48aba79b | 3956 | return -ENOTSOCK; |
36f4fa68 JA |
3957 | |
3958 | ret = __sys_shutdown_sock(sock, req->shutdown.how); | |
a146468d | 3959 | if (ret < 0) |
93d2bcd2 | 3960 | req_set_fail(req); |
36f4fa68 JA |
3961 | io_req_complete(req, ret); |
3962 | return 0; | |
3963 | #else | |
3964 | return -EOPNOTSUPP; | |
3965 | #endif | |
3966 | } | |
3967 | ||
f2a8d5c7 PB |
3968 | static int __io_splice_prep(struct io_kiocb *req, |
3969 | const struct io_uring_sqe *sqe) | |
7d67af2c | 3970 | { |
fe7e3257 | 3971 | struct io_splice *sp = &req->splice; |
7d67af2c | 3972 | unsigned int valid_flags = SPLICE_F_FD_IN_FIXED | SPLICE_F_ALL; |
7d67af2c | 3973 | |
3232dd02 PB |
3974 | if (unlikely(req->ctx->flags & IORING_SETUP_IOPOLL)) |
3975 | return -EINVAL; | |
7d67af2c PB |
3976 | |
3977 | sp->file_in = NULL; | |
7d67af2c PB |
3978 | sp->len = READ_ONCE(sqe->len); |
3979 | sp->flags = READ_ONCE(sqe->splice_flags); | |
3980 | ||
3981 | if (unlikely(sp->flags & ~valid_flags)) | |
3982 | return -EINVAL; | |
3983 | ||
62906e89 | 3984 | sp->file_in = io_file_get(req->ctx, req, READ_ONCE(sqe->splice_fd_in), |
8371adf5 PB |
3985 | (sp->flags & SPLICE_F_FD_IN_FIXED)); |
3986 | if (!sp->file_in) | |
3987 | return -EBADF; | |
7d67af2c | 3988 | req->flags |= REQ_F_NEED_CLEANUP; |
7d67af2c PB |
3989 | return 0; |
3990 | } | |
3991 | ||
f2a8d5c7 PB |
3992 | static int io_tee_prep(struct io_kiocb *req, |
3993 | const struct io_uring_sqe *sqe) | |
3994 | { | |
3995 | if (READ_ONCE(sqe->splice_off_in) || READ_ONCE(sqe->off)) | |
3996 | return -EINVAL; | |
3997 | return __io_splice_prep(req, sqe); | |
3998 | } | |
3999 | ||
45d189c6 | 4000 | static int io_tee(struct io_kiocb *req, unsigned int issue_flags) |
f2a8d5c7 PB |
4001 | { |
4002 | struct io_splice *sp = &req->splice; | |
4003 | struct file *in = sp->file_in; | |
4004 | struct file *out = sp->file_out; | |
4005 | unsigned int flags = sp->flags & ~SPLICE_F_FD_IN_FIXED; | |
4006 | long ret = 0; | |
4007 | ||
45d189c6 | 4008 | if (issue_flags & IO_URING_F_NONBLOCK) |
f2a8d5c7 PB |
4009 | return -EAGAIN; |
4010 | if (sp->len) | |
4011 | ret = do_tee(in, out, sp->len, flags); | |
4012 | ||
e1d767f0 PB |
4013 | if (!(sp->flags & SPLICE_F_FD_IN_FIXED)) |
4014 | io_put_file(in); | |
f2a8d5c7 PB |
4015 | req->flags &= ~REQ_F_NEED_CLEANUP; |
4016 | ||
f2a8d5c7 | 4017 | if (ret != sp->len) |
93d2bcd2 | 4018 | req_set_fail(req); |
e1e16097 | 4019 | io_req_complete(req, ret); |
f2a8d5c7 PB |
4020 | return 0; |
4021 | } | |
4022 | ||
4023 | static int io_splice_prep(struct io_kiocb *req, const struct io_uring_sqe *sqe) | |
4024 | { | |
fe7e3257 | 4025 | struct io_splice *sp = &req->splice; |
f2a8d5c7 PB |
4026 | |
4027 | sp->off_in = READ_ONCE(sqe->splice_off_in); | |
4028 | sp->off_out = READ_ONCE(sqe->off); | |
4029 | return __io_splice_prep(req, sqe); | |
4030 | } | |
4031 | ||
45d189c6 | 4032 | static int io_splice(struct io_kiocb *req, unsigned int issue_flags) |
7d67af2c PB |
4033 | { |
4034 | struct io_splice *sp = &req->splice; | |
4035 | struct file *in = sp->file_in; | |
4036 | struct file *out = sp->file_out; | |
4037 | unsigned int flags = sp->flags & ~SPLICE_F_FD_IN_FIXED; | |
4038 | loff_t *poff_in, *poff_out; | |
c9687426 | 4039 | long ret = 0; |
7d67af2c | 4040 | |
45d189c6 | 4041 | if (issue_flags & IO_URING_F_NONBLOCK) |
2fb3e822 | 4042 | return -EAGAIN; |
7d67af2c PB |
4043 | |
4044 | poff_in = (sp->off_in == -1) ? NULL : &sp->off_in; | |
4045 | poff_out = (sp->off_out == -1) ? NULL : &sp->off_out; | |
c9687426 | 4046 | |
948a7749 | 4047 | if (sp->len) |
c9687426 | 4048 | ret = do_splice(in, poff_in, out, poff_out, sp->len, flags); |
7d67af2c | 4049 | |
e1d767f0 PB |
4050 | if (!(sp->flags & SPLICE_F_FD_IN_FIXED)) |
4051 | io_put_file(in); | |
7d67af2c PB |
4052 | req->flags &= ~REQ_F_NEED_CLEANUP; |
4053 | ||
7d67af2c | 4054 | if (ret != sp->len) |
93d2bcd2 | 4055 | req_set_fail(req); |
e1e16097 | 4056 | io_req_complete(req, ret); |
7d67af2c PB |
4057 | return 0; |
4058 | } | |
4059 | ||
2b188cc1 JA |
4060 | /* |
4061 | * IORING_OP_NOP just posts a completion event, nothing else. | |
4062 | */ | |
889fca73 | 4063 | static int io_nop(struct io_kiocb *req, unsigned int issue_flags) |
2b188cc1 JA |
4064 | { |
4065 | struct io_ring_ctx *ctx = req->ctx; | |
2b188cc1 | 4066 | |
def596e9 JA |
4067 | if (unlikely(ctx->flags & IORING_SETUP_IOPOLL)) |
4068 | return -EINVAL; | |
4069 | ||
889fca73 | 4070 | __io_req_complete(req, issue_flags, 0, 0); |
2b188cc1 JA |
4071 | return 0; |
4072 | } | |
4073 | ||
1155c76a | 4074 | static int io_fsync_prep(struct io_kiocb *req, const struct io_uring_sqe *sqe) |
c992fe29 | 4075 | { |
6b06314c | 4076 | struct io_ring_ctx *ctx = req->ctx; |
c992fe29 | 4077 | |
09bb8394 JA |
4078 | if (!req->file) |
4079 | return -EBADF; | |
c992fe29 | 4080 | |
6b06314c | 4081 | if (unlikely(ctx->flags & IORING_SETUP_IOPOLL)) |
def596e9 | 4082 | return -EINVAL; |
26578cda PB |
4083 | if (unlikely(sqe->addr || sqe->ioprio || sqe->buf_index || |
4084 | sqe->splice_fd_in)) | |
c992fe29 CH |
4085 | return -EINVAL; |
4086 | ||
8ed8d3c3 JA |
4087 | req->sync.flags = READ_ONCE(sqe->fsync_flags); |
4088 | if (unlikely(req->sync.flags & ~IORING_FSYNC_DATASYNC)) | |
4089 | return -EINVAL; | |
4090 | ||
4091 | req->sync.off = READ_ONCE(sqe->off); | |
4092 | req->sync.len = READ_ONCE(sqe->len); | |
c992fe29 CH |
4093 | return 0; |
4094 | } | |
4095 | ||
45d189c6 | 4096 | static int io_fsync(struct io_kiocb *req, unsigned int issue_flags) |
8ed8d3c3 | 4097 | { |
8ed8d3c3 | 4098 | loff_t end = req->sync.off + req->sync.len; |
8ed8d3c3 JA |
4099 | int ret; |
4100 | ||
ac45abc0 | 4101 | /* fsync always requires a blocking context */ |
45d189c6 | 4102 | if (issue_flags & IO_URING_F_NONBLOCK) |
ac45abc0 PB |
4103 | return -EAGAIN; |
4104 | ||
9adbd45d | 4105 | ret = vfs_fsync_range(req->file, req->sync.off, |
8ed8d3c3 JA |
4106 | end > 0 ? end : LLONG_MAX, |
4107 | req->sync.flags & IORING_FSYNC_DATASYNC); | |
4108 | if (ret < 0) | |
93d2bcd2 | 4109 | req_set_fail(req); |
e1e16097 | 4110 | io_req_complete(req, ret); |
c992fe29 CH |
4111 | return 0; |
4112 | } | |
4113 | ||
d63d1b5e JA |
4114 | static int io_fallocate_prep(struct io_kiocb *req, |
4115 | const struct io_uring_sqe *sqe) | |
4116 | { | |
26578cda PB |
4117 | if (sqe->ioprio || sqe->buf_index || sqe->rw_flags || |
4118 | sqe->splice_fd_in) | |
d63d1b5e | 4119 | return -EINVAL; |
3232dd02 PB |
4120 | if (unlikely(req->ctx->flags & IORING_SETUP_IOPOLL)) |
4121 | return -EINVAL; | |
d63d1b5e JA |
4122 | |
4123 | req->sync.off = READ_ONCE(sqe->off); | |
4124 | req->sync.len = READ_ONCE(sqe->addr); | |
4125 | req->sync.mode = READ_ONCE(sqe->len); | |
4126 | return 0; | |
4127 | } | |
4128 | ||
45d189c6 | 4129 | static int io_fallocate(struct io_kiocb *req, unsigned int issue_flags) |
5d17b4a4 | 4130 | { |
ac45abc0 PB |
4131 | int ret; |
4132 | ||
d63d1b5e | 4133 | /* fallocate always requiring blocking context */ |
45d189c6 | 4134 | if (issue_flags & IO_URING_F_NONBLOCK) |
5d17b4a4 | 4135 | return -EAGAIN; |
ac45abc0 PB |
4136 | ret = vfs_fallocate(req->file, req->sync.mode, req->sync.off, |
4137 | req->sync.len); | |
ac45abc0 | 4138 | if (ret < 0) |
93d2bcd2 | 4139 | req_set_fail(req); |
e1e16097 | 4140 | io_req_complete(req, ret); |
5d17b4a4 JA |
4141 | return 0; |
4142 | } | |
4143 | ||
ec65fea5 | 4144 | static int __io_openat_prep(struct io_kiocb *req, const struct io_uring_sqe *sqe) |
b7bb4f7d | 4145 | { |
f8748881 | 4146 | const char __user *fname; |
15b71abe | 4147 | int ret; |
b7bb4f7d | 4148 | |
d3fddf6d PB |
4149 | if (unlikely(req->ctx->flags & IORING_SETUP_IOPOLL)) |
4150 | return -EINVAL; | |
b9445598 | 4151 | if (unlikely(sqe->ioprio || sqe->buf_index)) |
15b71abe | 4152 | return -EINVAL; |
ec65fea5 | 4153 | if (unlikely(req->flags & REQ_F_FIXED_FILE)) |
cf3040ca | 4154 | return -EBADF; |
03b1230c | 4155 | |
ec65fea5 PB |
4156 | /* open.how should be already initialised */ |
4157 | if (!(req->open.how.flags & O_PATH) && force_o_largefile()) | |
08a1d26e | 4158 | req->open.how.flags |= O_LARGEFILE; |
3529d8c2 | 4159 | |
25e72d10 PB |
4160 | req->open.dfd = READ_ONCE(sqe->fd); |
4161 | fname = u64_to_user_ptr(READ_ONCE(sqe->addr)); | |
f8748881 | 4162 | req->open.filename = getname(fname); |
15b71abe JA |
4163 | if (IS_ERR(req->open.filename)) { |
4164 | ret = PTR_ERR(req->open.filename); | |
4165 | req->open.filename = NULL; | |
4166 | return ret; | |
4167 | } | |
b9445598 PB |
4168 | |
4169 | req->open.file_slot = READ_ONCE(sqe->file_index); | |
4170 | if (req->open.file_slot && (req->open.how.flags & O_CLOEXEC)) | |
4171 | return -EINVAL; | |
4172 | ||
4022e7af | 4173 | req->open.nofile = rlimit(RLIMIT_NOFILE); |
8fef80bf | 4174 | req->flags |= REQ_F_NEED_CLEANUP; |
15b71abe | 4175 | return 0; |
03b1230c JA |
4176 | } |
4177 | ||
ec65fea5 PB |
4178 | static int io_openat_prep(struct io_kiocb *req, const struct io_uring_sqe *sqe) |
4179 | { | |
d3fddf6d PB |
4180 | u64 mode = READ_ONCE(sqe->len); |
4181 | u64 flags = READ_ONCE(sqe->open_flags); | |
ec65fea5 | 4182 | |
ec65fea5 PB |
4183 | req->open.how = build_open_how(flags, mode); |
4184 | return __io_openat_prep(req, sqe); | |
4185 | } | |
4186 | ||
cebdb986 | 4187 | static int io_openat2_prep(struct io_kiocb *req, const struct io_uring_sqe *sqe) |
aa1fa28f | 4188 | { |
cebdb986 | 4189 | struct open_how __user *how; |
cebdb986 | 4190 | size_t len; |
0fa03c62 JA |
4191 | int ret; |
4192 | ||
cebdb986 JA |
4193 | how = u64_to_user_ptr(READ_ONCE(sqe->addr2)); |
4194 | len = READ_ONCE(sqe->len); | |
cebdb986 JA |
4195 | if (len < OPEN_HOW_SIZE_VER0) |
4196 | return -EINVAL; | |
3529d8c2 | 4197 | |
cebdb986 JA |
4198 | ret = copy_struct_from_user(&req->open.how, sizeof(req->open.how), how, |
4199 | len); | |
4200 | if (ret) | |
4201 | return ret; | |
3529d8c2 | 4202 | |
ec65fea5 | 4203 | return __io_openat_prep(req, sqe); |
cebdb986 JA |
4204 | } |
4205 | ||
45d189c6 | 4206 | static int io_openat2(struct io_kiocb *req, unsigned int issue_flags) |
15b71abe JA |
4207 | { |
4208 | struct open_flags op; | |
15b71abe | 4209 | struct file *file; |
b9445598 PB |
4210 | bool resolve_nonblock, nonblock_set; |
4211 | bool fixed = !!req->open.file_slot; | |
15b71abe JA |
4212 | int ret; |
4213 | ||
cebdb986 | 4214 | ret = build_open_flags(&req->open.how, &op); |
15b71abe JA |
4215 | if (ret) |
4216 | goto err; | |
3a81fd02 JA |
4217 | nonblock_set = op.open_flag & O_NONBLOCK; |
4218 | resolve_nonblock = req->open.how.resolve & RESOLVE_CACHED; | |
45d189c6 | 4219 | if (issue_flags & IO_URING_F_NONBLOCK) { |
3a81fd02 JA |
4220 | /* |
4221 | * Don't bother trying for O_TRUNC, O_CREAT, or O_TMPFILE open, | |
4222 | * it'll always -EAGAIN | |
4223 | */ | |
4224 | if (req->open.how.flags & (O_TRUNC | O_CREAT | O_TMPFILE)) | |
4225 | return -EAGAIN; | |
4226 | op.lookup_flags |= LOOKUP_CACHED; | |
4227 | op.open_flag |= O_NONBLOCK; | |
4228 | } | |
15b71abe | 4229 | |
b9445598 PB |
4230 | if (!fixed) { |
4231 | ret = __get_unused_fd_flags(req->open.how.flags, req->open.nofile); | |
4232 | if (ret < 0) | |
4233 | goto err; | |
4234 | } | |
15b71abe JA |
4235 | |
4236 | file = do_filp_open(req->open.dfd, req->open.filename, &op); | |
12dcb58a | 4237 | if (IS_ERR(file)) { |
944d1444 | 4238 | /* |
12dcb58a PB |
4239 | * We could hang on to this 'fd' on retrying, but seems like |
4240 | * marginal gain for something that is now known to be a slower | |
4241 | * path. So just put it, and we'll get a new one when we retry. | |
944d1444 | 4242 | */ |
b9445598 PB |
4243 | if (!fixed) |
4244 | put_unused_fd(ret); | |
3a81fd02 | 4245 | |
15b71abe | 4246 | ret = PTR_ERR(file); |
12dcb58a PB |
4247 | /* only retry if RESOLVE_CACHED wasn't already set by application */ |
4248 | if (ret == -EAGAIN && | |
4249 | (!resolve_nonblock && (issue_flags & IO_URING_F_NONBLOCK))) | |
4250 | return -EAGAIN; | |
4251 | goto err; | |
15b71abe | 4252 | } |
12dcb58a PB |
4253 | |
4254 | if ((issue_flags & IO_URING_F_NONBLOCK) && !nonblock_set) | |
4255 | file->f_flags &= ~O_NONBLOCK; | |
4256 | fsnotify_open(file); | |
b9445598 PB |
4257 | |
4258 | if (!fixed) | |
4259 | fd_install(ret, file); | |
4260 | else | |
4261 | ret = io_install_fixed_file(req, file, issue_flags, | |
4262 | req->open.file_slot - 1); | |
15b71abe JA |
4263 | err: |
4264 | putname(req->open.filename); | |
8fef80bf | 4265 | req->flags &= ~REQ_F_NEED_CLEANUP; |
15b71abe | 4266 | if (ret < 0) |
93d2bcd2 | 4267 | req_set_fail(req); |
0bdf3398 | 4268 | __io_req_complete(req, issue_flags, ret, 0); |
15b71abe JA |
4269 | return 0; |
4270 | } | |
4271 | ||
45d189c6 | 4272 | static int io_openat(struct io_kiocb *req, unsigned int issue_flags) |
cebdb986 | 4273 | { |
e45cff58 | 4274 | return io_openat2(req, issue_flags); |
cebdb986 JA |
4275 | } |
4276 | ||
067524e9 JA |
4277 | static int io_remove_buffers_prep(struct io_kiocb *req, |
4278 | const struct io_uring_sqe *sqe) | |
4279 | { | |
4280 | struct io_provide_buf *p = &req->pbuf; | |
4281 | u64 tmp; | |
4282 | ||
26578cda PB |
4283 | if (sqe->ioprio || sqe->rw_flags || sqe->addr || sqe->len || sqe->off || |
4284 | sqe->splice_fd_in) | |
067524e9 JA |
4285 | return -EINVAL; |
4286 | ||
4287 | tmp = READ_ONCE(sqe->fd); | |
4288 | if (!tmp || tmp > USHRT_MAX) | |
4289 | return -EINVAL; | |
4290 | ||
4291 | memset(p, 0, sizeof(*p)); | |
4292 | p->nbufs = tmp; | |
4293 | p->bgid = READ_ONCE(sqe->buf_group); | |
4294 | return 0; | |
4295 | } | |
4296 | ||
4297 | static int __io_remove_buffers(struct io_ring_ctx *ctx, struct io_buffer *buf, | |
4298 | int bgid, unsigned nbufs) | |
4299 | { | |
4300 | unsigned i = 0; | |
4301 | ||
4302 | /* shouldn't happen */ | |
4303 | if (!nbufs) | |
4304 | return 0; | |
4305 | ||
4306 | /* the head kbuf is the list itself */ | |
4307 | while (!list_empty(&buf->list)) { | |
4308 | struct io_buffer *nxt; | |
4309 | ||
4310 | nxt = list_first_entry(&buf->list, struct io_buffer, list); | |
4311 | list_del(&nxt->list); | |
4312 | kfree(nxt); | |
4313 | if (++i == nbufs) | |
4314 | return i; | |
4315 | } | |
4316 | i++; | |
4317 | kfree(buf); | |
9e15c3a0 | 4318 | xa_erase(&ctx->io_buffers, bgid); |
067524e9 JA |
4319 | |
4320 | return i; | |
4321 | } | |
4322 | ||
889fca73 | 4323 | static int io_remove_buffers(struct io_kiocb *req, unsigned int issue_flags) |
067524e9 JA |
4324 | { |
4325 | struct io_provide_buf *p = &req->pbuf; | |
4326 | struct io_ring_ctx *ctx = req->ctx; | |
4327 | struct io_buffer *head; | |
4328 | int ret = 0; | |
45d189c6 | 4329 | bool force_nonblock = issue_flags & IO_URING_F_NONBLOCK; |
067524e9 JA |
4330 | |
4331 | io_ring_submit_lock(ctx, !force_nonblock); | |
4332 | ||
4333 | lockdep_assert_held(&ctx->uring_lock); | |
4334 | ||
4335 | ret = -ENOENT; | |
9e15c3a0 | 4336 | head = xa_load(&ctx->io_buffers, p->bgid); |
067524e9 JA |
4337 | if (head) |
4338 | ret = __io_remove_buffers(ctx, head, p->bgid, p->nbufs); | |
067524e9 | 4339 | if (ret < 0) |
93d2bcd2 | 4340 | req_set_fail(req); |
067524e9 | 4341 | |
9fb8cb49 PB |
4342 | /* complete before unlock, IOPOLL may need the lock */ |
4343 | __io_req_complete(req, issue_flags, ret, 0); | |
4344 | io_ring_submit_unlock(ctx, !force_nonblock); | |
067524e9 JA |
4345 | return 0; |
4346 | } | |
4347 | ||
ddf0322d JA |
4348 | static int io_provide_buffers_prep(struct io_kiocb *req, |
4349 | const struct io_uring_sqe *sqe) | |
4350 | { | |
38134ada | 4351 | unsigned long size, tmp_check; |
ddf0322d JA |
4352 | struct io_provide_buf *p = &req->pbuf; |
4353 | u64 tmp; | |
4354 | ||
26578cda | 4355 | if (sqe->ioprio || sqe->rw_flags || sqe->splice_fd_in) |
ddf0322d JA |
4356 | return -EINVAL; |
4357 | ||
4358 | tmp = READ_ONCE(sqe->fd); | |
4359 | if (!tmp || tmp > USHRT_MAX) | |
4360 | return -E2BIG; | |
4361 | p->nbufs = tmp; | |
4362 | p->addr = READ_ONCE(sqe->addr); | |
4363 | p->len = READ_ONCE(sqe->len); | |
4364 | ||
38134ada PB |
4365 | if (check_mul_overflow((unsigned long)p->len, (unsigned long)p->nbufs, |
4366 | &size)) | |
4367 | return -EOVERFLOW; | |
4368 | if (check_add_overflow((unsigned long)p->addr, size, &tmp_check)) | |
4369 | return -EOVERFLOW; | |
4370 | ||
d81269fe PB |
4371 | size = (unsigned long)p->len * p->nbufs; |
4372 | if (!access_ok(u64_to_user_ptr(p->addr), size)) | |
ddf0322d JA |
4373 | return -EFAULT; |
4374 | ||
4375 | p->bgid = READ_ONCE(sqe->buf_group); | |
4376 | tmp = READ_ONCE(sqe->off); | |
4377 | if (tmp > USHRT_MAX) | |
4378 | return -E2BIG; | |
4379 | p->bid = tmp; | |
4380 | return 0; | |
4381 | } | |
4382 | ||
4383 | static int io_add_buffers(struct io_provide_buf *pbuf, struct io_buffer **head) | |
4384 | { | |
4385 | struct io_buffer *buf; | |
4386 | u64 addr = pbuf->addr; | |
4387 | int i, bid = pbuf->bid; | |
4388 | ||
4389 | for (i = 0; i < pbuf->nbufs; i++) { | |
9990da93 | 4390 | buf = kmalloc(sizeof(*buf), GFP_KERNEL_ACCOUNT); |
ddf0322d JA |
4391 | if (!buf) |
4392 | break; | |
4393 | ||
4394 | buf->addr = addr; | |
d1f82808 | 4395 | buf->len = min_t(__u32, pbuf->len, MAX_RW_COUNT); |
ddf0322d JA |
4396 | buf->bid = bid; |
4397 | addr += pbuf->len; | |
4398 | bid++; | |
4399 | if (!*head) { | |
4400 | INIT_LIST_HEAD(&buf->list); | |
4401 | *head = buf; | |
4402 | } else { | |
4403 | list_add_tail(&buf->list, &(*head)->list); | |
4404 | } | |
4405 | } | |
4406 | ||
4407 | return i ? i : -ENOMEM; | |
4408 | } | |
4409 | ||
889fca73 | 4410 | static int io_provide_buffers(struct io_kiocb *req, unsigned int issue_flags) |
ddf0322d JA |
4411 | { |
4412 | struct io_provide_buf *p = &req->pbuf; | |
4413 | struct io_ring_ctx *ctx = req->ctx; | |
4414 | struct io_buffer *head, *list; | |
4415 | int ret = 0; | |
45d189c6 | 4416 | bool force_nonblock = issue_flags & IO_URING_F_NONBLOCK; |
ddf0322d JA |
4417 | |
4418 | io_ring_submit_lock(ctx, !force_nonblock); | |
4419 | ||
4420 | lockdep_assert_held(&ctx->uring_lock); | |
4421 | ||
9e15c3a0 | 4422 | list = head = xa_load(&ctx->io_buffers, p->bgid); |
ddf0322d JA |
4423 | |
4424 | ret = io_add_buffers(p, &head); | |
9e15c3a0 JA |
4425 | if (ret >= 0 && !list) { |
4426 | ret = xa_insert(&ctx->io_buffers, p->bgid, head, GFP_KERNEL); | |
4427 | if (ret < 0) | |
067524e9 | 4428 | __io_remove_buffers(ctx, head, p->bgid, -1U); |
ddf0322d | 4429 | } |
ddf0322d | 4430 | if (ret < 0) |
93d2bcd2 | 4431 | req_set_fail(req); |
9fb8cb49 PB |
4432 | /* complete before unlock, IOPOLL may need the lock */ |
4433 | __io_req_complete(req, issue_flags, ret, 0); | |
4434 | io_ring_submit_unlock(ctx, !force_nonblock); | |
ddf0322d | 4435 | return 0; |
cebdb986 JA |
4436 | } |
4437 | ||
3e4827b0 JA |
4438 | static int io_epoll_ctl_prep(struct io_kiocb *req, |
4439 | const struct io_uring_sqe *sqe) | |
4440 | { | |
4441 | #if defined(CONFIG_EPOLL) | |
26578cda | 4442 | if (sqe->ioprio || sqe->buf_index || sqe->splice_fd_in) |
3e4827b0 | 4443 | return -EINVAL; |
2d74d042 | 4444 | if (unlikely(req->ctx->flags & IORING_SETUP_IOPOLL)) |
3232dd02 | 4445 | return -EINVAL; |
3e4827b0 JA |
4446 | |
4447 | req->epoll.epfd = READ_ONCE(sqe->fd); | |
4448 | req->epoll.op = READ_ONCE(sqe->len); | |
4449 | req->epoll.fd = READ_ONCE(sqe->off); | |
4450 | ||
4451 | if (ep_op_has_event(req->epoll.op)) { | |
4452 | struct epoll_event __user *ev; | |
4453 | ||
4454 | ev = u64_to_user_ptr(READ_ONCE(sqe->addr)); | |
4455 | if (copy_from_user(&req->epoll.event, ev, sizeof(*ev))) | |
4456 | return -EFAULT; | |
4457 | } | |
4458 | ||
4459 | return 0; | |
4460 | #else | |
4461 | return -EOPNOTSUPP; | |
4462 | #endif | |
4463 | } | |
4464 | ||
889fca73 | 4465 | static int io_epoll_ctl(struct io_kiocb *req, unsigned int issue_flags) |
3e4827b0 JA |
4466 | { |
4467 | #if defined(CONFIG_EPOLL) | |
4468 | struct io_epoll *ie = &req->epoll; | |
4469 | int ret; | |
45d189c6 | 4470 | bool force_nonblock = issue_flags & IO_URING_F_NONBLOCK; |
3e4827b0 JA |
4471 | |
4472 | ret = do_epoll_ctl(ie->epfd, ie->op, ie->fd, &ie->event, force_nonblock); | |
4473 | if (force_nonblock && ret == -EAGAIN) | |
4474 | return -EAGAIN; | |
4475 | ||
4476 | if (ret < 0) | |
93d2bcd2 | 4477 | req_set_fail(req); |
889fca73 | 4478 | __io_req_complete(req, issue_flags, ret, 0); |
3e4827b0 JA |
4479 | return 0; |
4480 | #else | |
4481 | return -EOPNOTSUPP; | |
4482 | #endif | |
4483 | } | |
4484 | ||
c1ca757b JA |
4485 | static int io_madvise_prep(struct io_kiocb *req, const struct io_uring_sqe *sqe) |
4486 | { | |
4487 | #if defined(CONFIG_ADVISE_SYSCALLS) && defined(CONFIG_MMU) | |
26578cda | 4488 | if (sqe->ioprio || sqe->buf_index || sqe->off || sqe->splice_fd_in) |
c1ca757b | 4489 | return -EINVAL; |
3232dd02 PB |
4490 | if (unlikely(req->ctx->flags & IORING_SETUP_IOPOLL)) |
4491 | return -EINVAL; | |
c1ca757b JA |
4492 | |
4493 | req->madvise.addr = READ_ONCE(sqe->addr); | |
4494 | req->madvise.len = READ_ONCE(sqe->len); | |
4495 | req->madvise.advice = READ_ONCE(sqe->fadvise_advice); | |
4496 | return 0; | |
4497 | #else | |
4498 | return -EOPNOTSUPP; | |
4499 | #endif | |
4500 | } | |
4501 | ||
45d189c6 | 4502 | static int io_madvise(struct io_kiocb *req, unsigned int issue_flags) |
c1ca757b JA |
4503 | { |
4504 | #if defined(CONFIG_ADVISE_SYSCALLS) && defined(CONFIG_MMU) | |
4505 | struct io_madvise *ma = &req->madvise; | |
4506 | int ret; | |
4507 | ||
45d189c6 | 4508 | if (issue_flags & IO_URING_F_NONBLOCK) |
c1ca757b JA |
4509 | return -EAGAIN; |
4510 | ||
0726b01e | 4511 | ret = do_madvise(current->mm, ma->addr, ma->len, ma->advice); |
c1ca757b | 4512 | if (ret < 0) |
93d2bcd2 | 4513 | req_set_fail(req); |
e1e16097 | 4514 | io_req_complete(req, ret); |
c1ca757b JA |
4515 | return 0; |
4516 | #else | |
4517 | return -EOPNOTSUPP; | |
4518 | #endif | |
4519 | } | |
4520 | ||
4840e418 JA |
4521 | static int io_fadvise_prep(struct io_kiocb *req, const struct io_uring_sqe *sqe) |
4522 | { | |
26578cda | 4523 | if (sqe->ioprio || sqe->buf_index || sqe->addr || sqe->splice_fd_in) |
4840e418 | 4524 | return -EINVAL; |
3232dd02 PB |
4525 | if (unlikely(req->ctx->flags & IORING_SETUP_IOPOLL)) |
4526 | return -EINVAL; | |
4840e418 JA |
4527 | |
4528 | req->fadvise.offset = READ_ONCE(sqe->off); | |
4529 | req->fadvise.len = READ_ONCE(sqe->len); | |
4530 | req->fadvise.advice = READ_ONCE(sqe->fadvise_advice); | |
4531 | return 0; | |
4532 | } | |
4533 | ||
45d189c6 | 4534 | static int io_fadvise(struct io_kiocb *req, unsigned int issue_flags) |
4840e418 JA |
4535 | { |
4536 | struct io_fadvise *fa = &req->fadvise; | |
4537 | int ret; | |
4538 | ||
45d189c6 | 4539 | if (issue_flags & IO_URING_F_NONBLOCK) { |
3e69426d JA |
4540 | switch (fa->advice) { |
4541 | case POSIX_FADV_NORMAL: | |
4542 | case POSIX_FADV_RANDOM: | |
4543 | case POSIX_FADV_SEQUENTIAL: | |
4544 | break; | |
4545 | default: | |
4546 | return -EAGAIN; | |
4547 | } | |
4548 | } | |
4840e418 JA |
4549 | |
4550 | ret = vfs_fadvise(req->file, fa->offset, fa->len, fa->advice); | |
4551 | if (ret < 0) | |
93d2bcd2 | 4552 | req_set_fail(req); |
0bdf3398 | 4553 | __io_req_complete(req, issue_flags, ret, 0); |
4840e418 JA |
4554 | return 0; |
4555 | } | |
4556 | ||
eddc7ef5 JA |
4557 | static int io_statx_prep(struct io_kiocb *req, const struct io_uring_sqe *sqe) |
4558 | { | |
2d74d042 | 4559 | if (unlikely(req->ctx->flags & IORING_SETUP_IOPOLL)) |
3232dd02 | 4560 | return -EINVAL; |
26578cda | 4561 | if (sqe->ioprio || sqe->buf_index || sqe->splice_fd_in) |
eddc7ef5 | 4562 | return -EINVAL; |
9c280f90 | 4563 | if (req->flags & REQ_F_FIXED_FILE) |
cf3040ca | 4564 | return -EBADF; |
eddc7ef5 | 4565 | |
1d9e1288 BM |
4566 | req->statx.dfd = READ_ONCE(sqe->fd); |
4567 | req->statx.mask = READ_ONCE(sqe->len); | |
e62753e4 | 4568 | req->statx.filename = u64_to_user_ptr(READ_ONCE(sqe->addr)); |
1d9e1288 BM |
4569 | req->statx.buffer = u64_to_user_ptr(READ_ONCE(sqe->addr2)); |
4570 | req->statx.flags = READ_ONCE(sqe->statx_flags); | |
eddc7ef5 JA |
4571 | |
4572 | return 0; | |
4573 | } | |
4574 | ||
45d189c6 | 4575 | static int io_statx(struct io_kiocb *req, unsigned int issue_flags) |
eddc7ef5 | 4576 | { |
1d9e1288 | 4577 | struct io_statx *ctx = &req->statx; |
eddc7ef5 JA |
4578 | int ret; |
4579 | ||
59d70013 | 4580 | if (issue_flags & IO_URING_F_NONBLOCK) |
eddc7ef5 JA |
4581 | return -EAGAIN; |
4582 | ||
e62753e4 BM |
4583 | ret = do_statx(ctx->dfd, ctx->filename, ctx->flags, ctx->mask, |
4584 | ctx->buffer); | |
eddc7ef5 | 4585 | |
eddc7ef5 | 4586 | if (ret < 0) |
93d2bcd2 | 4587 | req_set_fail(req); |
e1e16097 | 4588 | io_req_complete(req, ret); |
eddc7ef5 JA |
4589 | return 0; |
4590 | } | |
4591 | ||
b5dba59e JA |
4592 | static int io_close_prep(struct io_kiocb *req, const struct io_uring_sqe *sqe) |
4593 | { | |
14587a46 | 4594 | if (unlikely(req->ctx->flags & IORING_SETUP_IOPOLL)) |
3232dd02 | 4595 | return -EINVAL; |
b5dba59e | 4596 | if (sqe->ioprio || sqe->off || sqe->addr || sqe->len || |
7df778be | 4597 | sqe->rw_flags || sqe->buf_index) |
b5dba59e | 4598 | return -EINVAL; |
9c280f90 | 4599 | if (req->flags & REQ_F_FIXED_FILE) |
cf3040ca | 4600 | return -EBADF; |
b5dba59e JA |
4601 | |
4602 | req->close.fd = READ_ONCE(sqe->fd); | |
7df778be PB |
4603 | req->close.file_slot = READ_ONCE(sqe->file_index); |
4604 | if (req->close.file_slot && req->close.fd) | |
4605 | return -EINVAL; | |
4606 | ||
b5dba59e | 4607 | return 0; |
b5dba59e JA |
4608 | } |
4609 | ||
889fca73 | 4610 | static int io_close(struct io_kiocb *req, unsigned int issue_flags) |
b5dba59e | 4611 | { |
9eac1904 | 4612 | struct files_struct *files = current->files; |
3af73b28 | 4613 | struct io_close *close = &req->close; |
9eac1904 | 4614 | struct fdtable *fdt; |
a1fde923 PB |
4615 | struct file *file = NULL; |
4616 | int ret = -EBADF; | |
b5dba59e | 4617 | |
7df778be PB |
4618 | if (req->close.file_slot) { |
4619 | ret = io_close_fixed(req, issue_flags); | |
4620 | goto err; | |
4621 | } | |
4622 | ||
9eac1904 JA |
4623 | spin_lock(&files->file_lock); |
4624 | fdt = files_fdtable(files); | |
4625 | if (close->fd >= fdt->max_fds) { | |
4626 | spin_unlock(&files->file_lock); | |
4627 | goto err; | |
4628 | } | |
4629 | file = fdt->fd[close->fd]; | |
a1fde923 | 4630 | if (!file || file->f_op == &io_uring_fops) { |
9eac1904 JA |
4631 | spin_unlock(&files->file_lock); |
4632 | file = NULL; | |
4633 | goto err; | |
3af73b28 | 4634 | } |
b5dba59e JA |
4635 | |
4636 | /* if the file has a flush method, be safe and punt to async */ | |
45d189c6 | 4637 | if (file->f_op->flush && (issue_flags & IO_URING_F_NONBLOCK)) { |
9eac1904 | 4638 | spin_unlock(&files->file_lock); |
0bf0eefd | 4639 | return -EAGAIN; |
a2100672 | 4640 | } |
b5dba59e | 4641 | |
9eac1904 JA |
4642 | ret = __close_fd_get_file(close->fd, &file); |
4643 | spin_unlock(&files->file_lock); | |
4644 | if (ret < 0) { | |
4645 | if (ret == -ENOENT) | |
4646 | ret = -EBADF; | |
4647 | goto err; | |
4648 | } | |
4649 | ||
3af73b28 | 4650 | /* No ->flush() or already async, safely close from here */ |
9eac1904 JA |
4651 | ret = filp_close(file, current->files); |
4652 | err: | |
3af73b28 | 4653 | if (ret < 0) |
93d2bcd2 | 4654 | req_set_fail(req); |
9eac1904 JA |
4655 | if (file) |
4656 | fput(file); | |
889fca73 | 4657 | __io_req_complete(req, issue_flags, ret, 0); |
1a417f4e | 4658 | return 0; |
b5dba59e JA |
4659 | } |
4660 | ||
1155c76a | 4661 | static int io_sfr_prep(struct io_kiocb *req, const struct io_uring_sqe *sqe) |
5d17b4a4 JA |
4662 | { |
4663 | struct io_ring_ctx *ctx = req->ctx; | |
5d17b4a4 | 4664 | |
5d17b4a4 JA |
4665 | if (unlikely(ctx->flags & IORING_SETUP_IOPOLL)) |
4666 | return -EINVAL; | |
26578cda PB |
4667 | if (unlikely(sqe->addr || sqe->ioprio || sqe->buf_index || |
4668 | sqe->splice_fd_in)) | |
5d17b4a4 JA |
4669 | return -EINVAL; |
4670 | ||
8ed8d3c3 JA |
4671 | req->sync.off = READ_ONCE(sqe->off); |
4672 | req->sync.len = READ_ONCE(sqe->len); | |
4673 | req->sync.flags = READ_ONCE(sqe->sync_range_flags); | |
8ed8d3c3 JA |
4674 | return 0; |
4675 | } | |
4676 | ||
45d189c6 | 4677 | static int io_sync_file_range(struct io_kiocb *req, unsigned int issue_flags) |
8ed8d3c3 | 4678 | { |
8ed8d3c3 JA |
4679 | int ret; |
4680 | ||
ac45abc0 | 4681 | /* sync_file_range always requires a blocking context */ |
45d189c6 | 4682 | if (issue_flags & IO_URING_F_NONBLOCK) |
ac45abc0 PB |
4683 | return -EAGAIN; |
4684 | ||
9adbd45d | 4685 | ret = sync_file_range(req->file, req->sync.off, req->sync.len, |
8ed8d3c3 JA |
4686 | req->sync.flags); |
4687 | if (ret < 0) | |
93d2bcd2 | 4688 | req_set_fail(req); |
e1e16097 | 4689 | io_req_complete(req, ret); |
5d17b4a4 JA |
4690 | return 0; |
4691 | } | |
4692 | ||
469956e8 | 4693 | #if defined(CONFIG_NET) |
02d27d89 PB |
4694 | static int io_setup_async_msg(struct io_kiocb *req, |
4695 | struct io_async_msghdr *kmsg) | |
4696 | { | |
e8c2bc1f JA |
4697 | struct io_async_msghdr *async_msg = req->async_data; |
4698 | ||
4699 | if (async_msg) | |
02d27d89 | 4700 | return -EAGAIN; |
e8c2bc1f | 4701 | if (io_alloc_async_data(req)) { |
257e84a5 | 4702 | kfree(kmsg->free_iov); |
02d27d89 PB |
4703 | return -ENOMEM; |
4704 | } | |
e8c2bc1f | 4705 | async_msg = req->async_data; |
02d27d89 | 4706 | req->flags |= REQ_F_NEED_CLEANUP; |
e8c2bc1f | 4707 | memcpy(async_msg, kmsg, sizeof(*kmsg)); |
2a780802 | 4708 | async_msg->msg.msg_name = &async_msg->addr; |
257e84a5 PB |
4709 | /* if were using fast_iov, set it to the new one */ |
4710 | if (!async_msg->free_iov) | |
4711 | async_msg->msg.msg_iter.iov = async_msg->fast_iov; | |
4712 | ||
02d27d89 PB |
4713 | return -EAGAIN; |
4714 | } | |
4715 | ||
2ae523ed PB |
4716 | static int io_sendmsg_copy_hdr(struct io_kiocb *req, |
4717 | struct io_async_msghdr *iomsg) | |
4718 | { | |
2ae523ed | 4719 | iomsg->msg.msg_name = &iomsg->addr; |
257e84a5 | 4720 | iomsg->free_iov = iomsg->fast_iov; |
2ae523ed | 4721 | return sendmsg_copy_msghdr(&iomsg->msg, req->sr_msg.umsg, |
257e84a5 | 4722 | req->sr_msg.msg_flags, &iomsg->free_iov); |
2ae523ed PB |
4723 | } |
4724 | ||
93642ef8 PB |
4725 | static int io_sendmsg_prep_async(struct io_kiocb *req) |
4726 | { | |
4727 | int ret; | |
4728 | ||
93642ef8 PB |
4729 | ret = io_sendmsg_copy_hdr(req, req->async_data); |
4730 | if (!ret) | |
4731 | req->flags |= REQ_F_NEED_CLEANUP; | |
4732 | return ret; | |
4733 | } | |
4734 | ||
3529d8c2 | 4735 | static int io_sendmsg_prep(struct io_kiocb *req, const struct io_uring_sqe *sqe) |
03b1230c | 4736 | { |
e47293fd | 4737 | struct io_sr_msg *sr = &req->sr_msg; |
03b1230c | 4738 | |
d2b6f48b PB |
4739 | if (unlikely(req->ctx->flags & IORING_SETUP_IOPOLL)) |
4740 | return -EINVAL; | |
4741 | ||
270a5940 | 4742 | sr->umsg = u64_to_user_ptr(READ_ONCE(sqe->addr)); |
fddaface | 4743 | sr->len = READ_ONCE(sqe->len); |
04411806 PB |
4744 | sr->msg_flags = READ_ONCE(sqe->msg_flags) | MSG_NOSIGNAL; |
4745 | if (sr->msg_flags & MSG_DONTWAIT) | |
4746 | req->flags |= REQ_F_NOWAIT; | |
3529d8c2 | 4747 | |
d8768362 JA |
4748 | #ifdef CONFIG_COMPAT |
4749 | if (req->ctx->compat) | |
4750 | sr->msg_flags |= MSG_CMSG_COMPAT; | |
4751 | #endif | |
93642ef8 | 4752 | return 0; |
03b1230c JA |
4753 | } |
4754 | ||
889fca73 | 4755 | static int io_sendmsg(struct io_kiocb *req, unsigned int issue_flags) |
aa1fa28f | 4756 | { |
6b754c8b | 4757 | struct io_async_msghdr iomsg, *kmsg; |
0fa03c62 | 4758 | struct socket *sock; |
7a7cacba | 4759 | unsigned flags; |
0031275d | 4760 | int min_ret = 0; |
0fa03c62 JA |
4761 | int ret; |
4762 | ||
dba4a925 | 4763 | sock = sock_from_file(req->file); |
7a7cacba | 4764 | if (unlikely(!sock)) |
dba4a925 | 4765 | return -ENOTSOCK; |
3529d8c2 | 4766 | |
257e84a5 PB |
4767 | kmsg = req->async_data; |
4768 | if (!kmsg) { | |
7a7cacba PB |
4769 | ret = io_sendmsg_copy_hdr(req, &iomsg); |
4770 | if (ret) | |
4771 | return ret; | |
4772 | kmsg = &iomsg; | |
0fa03c62 | 4773 | } |
0fa03c62 | 4774 | |
04411806 PB |
4775 | flags = req->sr_msg.msg_flags; |
4776 | if (issue_flags & IO_URING_F_NONBLOCK) | |
7a7cacba | 4777 | flags |= MSG_DONTWAIT; |
0031275d SM |
4778 | if (flags & MSG_WAITALL) |
4779 | min_ret = iov_iter_count(&kmsg->msg.msg_iter); | |
4780 | ||
7a7cacba | 4781 | ret = __sys_sendmsg_sock(sock, &kmsg->msg, flags); |
45d189c6 | 4782 | if ((issue_flags & IO_URING_F_NONBLOCK) && ret == -EAGAIN) |
7a7cacba PB |
4783 | return io_setup_async_msg(req, kmsg); |
4784 | if (ret == -ERESTARTSYS) | |
4785 | ret = -EINTR; | |
0fa03c62 | 4786 | |
257e84a5 PB |
4787 | /* fast path, check for non-NULL to avoid function call */ |
4788 | if (kmsg->free_iov) | |
4789 | kfree(kmsg->free_iov); | |
99bc4c38 | 4790 | req->flags &= ~REQ_F_NEED_CLEANUP; |
0031275d | 4791 | if (ret < min_ret) |
93d2bcd2 | 4792 | req_set_fail(req); |
889fca73 | 4793 | __io_req_complete(req, issue_flags, ret, 0); |
5d17b4a4 | 4794 | return 0; |
03b1230c | 4795 | } |
aa1fa28f | 4796 | |
889fca73 | 4797 | static int io_send(struct io_kiocb *req, unsigned int issue_flags) |
fddaface | 4798 | { |
7a7cacba PB |
4799 | struct io_sr_msg *sr = &req->sr_msg; |
4800 | struct msghdr msg; | |
4801 | struct iovec iov; | |
fddaface | 4802 | struct socket *sock; |
7a7cacba | 4803 | unsigned flags; |
0031275d | 4804 | int min_ret = 0; |
fddaface JA |
4805 | int ret; |
4806 | ||
dba4a925 | 4807 | sock = sock_from_file(req->file); |
7a7cacba | 4808 | if (unlikely(!sock)) |
dba4a925 | 4809 | return -ENOTSOCK; |
fddaface | 4810 | |
7a7cacba PB |
4811 | ret = import_single_range(WRITE, sr->buf, sr->len, &iov, &msg.msg_iter); |
4812 | if (unlikely(ret)) | |
14db8411 | 4813 | return ret; |
fddaface | 4814 | |
7a7cacba PB |
4815 | msg.msg_name = NULL; |
4816 | msg.msg_control = NULL; | |
4817 | msg.msg_controllen = 0; | |
4818 | msg.msg_namelen = 0; | |
fddaface | 4819 | |
04411806 PB |
4820 | flags = req->sr_msg.msg_flags; |
4821 | if (issue_flags & IO_URING_F_NONBLOCK) | |
7a7cacba | 4822 | flags |= MSG_DONTWAIT; |
0031275d SM |
4823 | if (flags & MSG_WAITALL) |
4824 | min_ret = iov_iter_count(&msg.msg_iter); | |
4825 | ||
7a7cacba PB |
4826 | msg.msg_flags = flags; |
4827 | ret = sock_sendmsg(sock, &msg); | |
45d189c6 | 4828 | if ((issue_flags & IO_URING_F_NONBLOCK) && ret == -EAGAIN) |
7a7cacba PB |
4829 | return -EAGAIN; |
4830 | if (ret == -ERESTARTSYS) | |
4831 | ret = -EINTR; | |
fddaface | 4832 | |
0031275d | 4833 | if (ret < min_ret) |
93d2bcd2 | 4834 | req_set_fail(req); |
889fca73 | 4835 | __io_req_complete(req, issue_flags, ret, 0); |
fddaface | 4836 | return 0; |
fddaface JA |
4837 | } |
4838 | ||
1400e697 PB |
4839 | static int __io_recvmsg_copy_hdr(struct io_kiocb *req, |
4840 | struct io_async_msghdr *iomsg) | |
52de1fe1 JA |
4841 | { |
4842 | struct io_sr_msg *sr = &req->sr_msg; | |
4843 | struct iovec __user *uiov; | |
4844 | size_t iov_len; | |
4845 | int ret; | |
4846 | ||
1400e697 PB |
4847 | ret = __copy_msghdr_from_user(&iomsg->msg, sr->umsg, |
4848 | &iomsg->uaddr, &uiov, &iov_len); | |
52de1fe1 JA |
4849 | if (ret) |
4850 | return ret; | |
4851 | ||
4852 | if (req->flags & REQ_F_BUFFER_SELECT) { | |
4853 | if (iov_len > 1) | |
4854 | return -EINVAL; | |
5476dfed | 4855 | if (copy_from_user(iomsg->fast_iov, uiov, sizeof(*uiov))) |
52de1fe1 | 4856 | return -EFAULT; |
5476dfed | 4857 | sr->len = iomsg->fast_iov[0].iov_len; |
257e84a5 | 4858 | iomsg->free_iov = NULL; |
52de1fe1 | 4859 | } else { |
257e84a5 | 4860 | iomsg->free_iov = iomsg->fast_iov; |
89cd35c5 | 4861 | ret = __import_iovec(READ, uiov, iov_len, UIO_FASTIOV, |
257e84a5 | 4862 | &iomsg->free_iov, &iomsg->msg.msg_iter, |
89cd35c5 | 4863 | false); |
52de1fe1 JA |
4864 | if (ret > 0) |
4865 | ret = 0; | |
4866 | } | |
4867 | ||
4868 | return ret; | |
4869 | } | |
4870 | ||
4871 | #ifdef CONFIG_COMPAT | |
4872 | static int __io_compat_recvmsg_copy_hdr(struct io_kiocb *req, | |
1400e697 | 4873 | struct io_async_msghdr *iomsg) |
52de1fe1 | 4874 | { |
52de1fe1 JA |
4875 | struct io_sr_msg *sr = &req->sr_msg; |
4876 | struct compat_iovec __user *uiov; | |
4877 | compat_uptr_t ptr; | |
4878 | compat_size_t len; | |
4879 | int ret; | |
4880 | ||
4af3417a PB |
4881 | ret = __get_compat_msghdr(&iomsg->msg, sr->umsg_compat, &iomsg->uaddr, |
4882 | &ptr, &len); | |
52de1fe1 JA |
4883 | if (ret) |
4884 | return ret; | |
4885 | ||
4886 | uiov = compat_ptr(ptr); | |
4887 | if (req->flags & REQ_F_BUFFER_SELECT) { | |
4888 | compat_ssize_t clen; | |
4889 | ||
4890 | if (len > 1) | |
4891 | return -EINVAL; | |
4892 | if (!access_ok(uiov, sizeof(*uiov))) | |
4893 | return -EFAULT; | |
4894 | if (__get_user(clen, &uiov->iov_len)) | |
4895 | return -EFAULT; | |
4896 | if (clen < 0) | |
4897 | return -EINVAL; | |
2d280bc8 | 4898 | sr->len = clen; |
257e84a5 | 4899 | iomsg->free_iov = NULL; |
52de1fe1 | 4900 | } else { |
257e84a5 | 4901 | iomsg->free_iov = iomsg->fast_iov; |
89cd35c5 | 4902 | ret = __import_iovec(READ, (struct iovec __user *)uiov, len, |
257e84a5 | 4903 | UIO_FASTIOV, &iomsg->free_iov, |
89cd35c5 | 4904 | &iomsg->msg.msg_iter, true); |
52de1fe1 JA |
4905 | if (ret < 0) |
4906 | return ret; | |
4907 | } | |
4908 | ||
4909 | return 0; | |
4910 | } | |
4911 | #endif | |
4912 | ||
1400e697 PB |
4913 | static int io_recvmsg_copy_hdr(struct io_kiocb *req, |
4914 | struct io_async_msghdr *iomsg) | |
52de1fe1 | 4915 | { |
1400e697 | 4916 | iomsg->msg.msg_name = &iomsg->addr; |
52de1fe1 JA |
4917 | |
4918 | #ifdef CONFIG_COMPAT | |
4919 | if (req->ctx->compat) | |
1400e697 | 4920 | return __io_compat_recvmsg_copy_hdr(req, iomsg); |
fddaface | 4921 | #endif |
52de1fe1 | 4922 | |
1400e697 | 4923 | return __io_recvmsg_copy_hdr(req, iomsg); |
52de1fe1 JA |
4924 | } |
4925 | ||
bcda7baa | 4926 | static struct io_buffer *io_recv_buffer_select(struct io_kiocb *req, |
7fbb1b54 | 4927 | bool needs_lock) |
bcda7baa JA |
4928 | { |
4929 | struct io_sr_msg *sr = &req->sr_msg; | |
4930 | struct io_buffer *kbuf; | |
4931 | ||
bcda7baa JA |
4932 | kbuf = io_buffer_select(req, &sr->len, sr->bgid, sr->kbuf, needs_lock); |
4933 | if (IS_ERR(kbuf)) | |
4934 | return kbuf; | |
4935 | ||
4936 | sr->kbuf = kbuf; | |
4937 | req->flags |= REQ_F_BUFFER_SELECTED; | |
bcda7baa | 4938 | return kbuf; |
fddaface JA |
4939 | } |
4940 | ||
7fbb1b54 PB |
4941 | static inline unsigned int io_put_recv_kbuf(struct io_kiocb *req) |
4942 | { | |
4943 | return io_put_kbuf(req, req->sr_msg.kbuf); | |
4944 | } | |
4945 | ||
93642ef8 | 4946 | static int io_recvmsg_prep_async(struct io_kiocb *req) |
aa1fa28f | 4947 | { |
99bc4c38 | 4948 | int ret; |
3529d8c2 | 4949 | |
93642ef8 PB |
4950 | ret = io_recvmsg_copy_hdr(req, req->async_data); |
4951 | if (!ret) | |
4952 | req->flags |= REQ_F_NEED_CLEANUP; | |
4953 | return ret; | |
4954 | } | |
4955 | ||
4956 | static int io_recvmsg_prep(struct io_kiocb *req, const struct io_uring_sqe *sqe) | |
4957 | { | |
4958 | struct io_sr_msg *sr = &req->sr_msg; | |
4959 | ||
d2b6f48b PB |
4960 | if (unlikely(req->ctx->flags & IORING_SETUP_IOPOLL)) |
4961 | return -EINVAL; | |
4962 | ||
270a5940 | 4963 | sr->umsg = u64_to_user_ptr(READ_ONCE(sqe->addr)); |
0b7b21e4 | 4964 | sr->len = READ_ONCE(sqe->len); |
bcda7baa | 4965 | sr->bgid = READ_ONCE(sqe->buf_group); |
04411806 PB |
4966 | sr->msg_flags = READ_ONCE(sqe->msg_flags) | MSG_NOSIGNAL; |
4967 | if (sr->msg_flags & MSG_DONTWAIT) | |
4968 | req->flags |= REQ_F_NOWAIT; | |
06b76d44 | 4969 | |
d8768362 JA |
4970 | #ifdef CONFIG_COMPAT |
4971 | if (req->ctx->compat) | |
4972 | sr->msg_flags |= MSG_CMSG_COMPAT; | |
4973 | #endif | |
93642ef8 | 4974 | return 0; |
aa1fa28f JA |
4975 | } |
4976 | ||
889fca73 | 4977 | static int io_recvmsg(struct io_kiocb *req, unsigned int issue_flags) |
aa1fa28f | 4978 | { |
6b754c8b | 4979 | struct io_async_msghdr iomsg, *kmsg; |
03b1230c | 4980 | struct socket *sock; |
7fbb1b54 | 4981 | struct io_buffer *kbuf; |
7a7cacba | 4982 | unsigned flags; |
0031275d | 4983 | int min_ret = 0; |
52de1fe1 | 4984 | int ret, cflags = 0; |
45d189c6 | 4985 | bool force_nonblock = issue_flags & IO_URING_F_NONBLOCK; |
03b1230c | 4986 | |
dba4a925 | 4987 | sock = sock_from_file(req->file); |
7a7cacba | 4988 | if (unlikely(!sock)) |
dba4a925 | 4989 | return -ENOTSOCK; |
3529d8c2 | 4990 | |
257e84a5 PB |
4991 | kmsg = req->async_data; |
4992 | if (!kmsg) { | |
7a7cacba PB |
4993 | ret = io_recvmsg_copy_hdr(req, &iomsg); |
4994 | if (ret) | |
681fda8d | 4995 | return ret; |
7a7cacba PB |
4996 | kmsg = &iomsg; |
4997 | } | |
03b1230c | 4998 | |
bc02ef33 | 4999 | if (req->flags & REQ_F_BUFFER_SELECT) { |
7fbb1b54 | 5000 | kbuf = io_recv_buffer_select(req, !force_nonblock); |
bc02ef33 | 5001 | if (IS_ERR(kbuf)) |
52de1fe1 | 5002 | return PTR_ERR(kbuf); |
7a7cacba | 5003 | kmsg->fast_iov[0].iov_base = u64_to_user_ptr(kbuf->addr); |
5476dfed PB |
5004 | kmsg->fast_iov[0].iov_len = req->sr_msg.len; |
5005 | iov_iter_init(&kmsg->msg.msg_iter, READ, kmsg->fast_iov, | |
7a7cacba PB |
5006 | 1, req->sr_msg.len); |
5007 | } | |
52de1fe1 | 5008 | |
04411806 PB |
5009 | flags = req->sr_msg.msg_flags; |
5010 | if (force_nonblock) | |
7a7cacba | 5011 | flags |= MSG_DONTWAIT; |
0031275d SM |
5012 | if (flags & MSG_WAITALL) |
5013 | min_ret = iov_iter_count(&kmsg->msg.msg_iter); | |
5014 | ||
7a7cacba PB |
5015 | ret = __sys_recvmsg_sock(sock, &kmsg->msg, req->sr_msg.umsg, |
5016 | kmsg->uaddr, flags); | |
0e1b6fe3 PB |
5017 | if (force_nonblock && ret == -EAGAIN) |
5018 | return io_setup_async_msg(req, kmsg); | |
7a7cacba PB |
5019 | if (ret == -ERESTARTSYS) |
5020 | ret = -EINTR; | |
03b1230c | 5021 | |
7fbb1b54 PB |
5022 | if (req->flags & REQ_F_BUFFER_SELECTED) |
5023 | cflags = io_put_recv_kbuf(req); | |
257e84a5 PB |
5024 | /* fast path, check for non-NULL to avoid function call */ |
5025 | if (kmsg->free_iov) | |
5026 | kfree(kmsg->free_iov); | |
99bc4c38 | 5027 | req->flags &= ~REQ_F_NEED_CLEANUP; |
0031275d | 5028 | if (ret < min_ret || ((flags & MSG_WAITALL) && (kmsg->msg.msg_flags & (MSG_TRUNC | MSG_CTRUNC)))) |
93d2bcd2 | 5029 | req_set_fail(req); |
889fca73 | 5030 | __io_req_complete(req, issue_flags, ret, cflags); |
03b1230c | 5031 | return 0; |
0fa03c62 | 5032 | } |
5d17b4a4 | 5033 | |
889fca73 | 5034 | static int io_recv(struct io_kiocb *req, unsigned int issue_flags) |
fddaface | 5035 | { |
6b754c8b | 5036 | struct io_buffer *kbuf; |
7a7cacba PB |
5037 | struct io_sr_msg *sr = &req->sr_msg; |
5038 | struct msghdr msg; | |
5039 | void __user *buf = sr->buf; | |
fddaface | 5040 | struct socket *sock; |
7a7cacba PB |
5041 | struct iovec iov; |
5042 | unsigned flags; | |
0031275d | 5043 | int min_ret = 0; |
bcda7baa | 5044 | int ret, cflags = 0; |
45d189c6 | 5045 | bool force_nonblock = issue_flags & IO_URING_F_NONBLOCK; |
fddaface | 5046 | |
dba4a925 | 5047 | sock = sock_from_file(req->file); |
7a7cacba | 5048 | if (unlikely(!sock)) |
dba4a925 | 5049 | return -ENOTSOCK; |
fddaface | 5050 | |
bc02ef33 | 5051 | if (req->flags & REQ_F_BUFFER_SELECT) { |
7fbb1b54 | 5052 | kbuf = io_recv_buffer_select(req, !force_nonblock); |
bcda7baa JA |
5053 | if (IS_ERR(kbuf)) |
5054 | return PTR_ERR(kbuf); | |
7a7cacba | 5055 | buf = u64_to_user_ptr(kbuf->addr); |
bc02ef33 | 5056 | } |
bcda7baa | 5057 | |
7a7cacba | 5058 | ret = import_single_range(READ, buf, sr->len, &iov, &msg.msg_iter); |
14c32eee PB |
5059 | if (unlikely(ret)) |
5060 | goto out_free; | |
fddaface | 5061 | |
7a7cacba PB |
5062 | msg.msg_name = NULL; |
5063 | msg.msg_control = NULL; | |
5064 | msg.msg_controllen = 0; | |
5065 | msg.msg_namelen = 0; | |
5066 | msg.msg_iocb = NULL; | |
5067 | msg.msg_flags = 0; | |
fddaface | 5068 | |
04411806 PB |
5069 | flags = req->sr_msg.msg_flags; |
5070 | if (force_nonblock) | |
7a7cacba | 5071 | flags |= MSG_DONTWAIT; |
0031275d SM |
5072 | if (flags & MSG_WAITALL) |
5073 | min_ret = iov_iter_count(&msg.msg_iter); | |
5074 | ||
7a7cacba PB |
5075 | ret = sock_recvmsg(sock, &msg, flags); |
5076 | if (force_nonblock && ret == -EAGAIN) | |
5077 | return -EAGAIN; | |
5078 | if (ret == -ERESTARTSYS) | |
5079 | ret = -EINTR; | |
14c32eee | 5080 | out_free: |
7fbb1b54 PB |
5081 | if (req->flags & REQ_F_BUFFER_SELECTED) |
5082 | cflags = io_put_recv_kbuf(req); | |
0031275d | 5083 | if (ret < min_ret || ((flags & MSG_WAITALL) && (msg.msg_flags & (MSG_TRUNC | MSG_CTRUNC)))) |
93d2bcd2 | 5084 | req_set_fail(req); |
889fca73 | 5085 | __io_req_complete(req, issue_flags, ret, cflags); |
fddaface | 5086 | return 0; |
fddaface JA |
5087 | } |
5088 | ||
3529d8c2 | 5089 | static int io_accept_prep(struct io_kiocb *req, const struct io_uring_sqe *sqe) |
17f2fe35 | 5090 | { |
8ed8d3c3 JA |
5091 | struct io_accept *accept = &req->accept; |
5092 | ||
14587a46 | 5093 | if (unlikely(req->ctx->flags & IORING_SETUP_IOPOLL)) |
17f2fe35 | 5094 | return -EINVAL; |
aaa4db12 | 5095 | if (sqe->ioprio || sqe->len || sqe->buf_index) |
17f2fe35 JA |
5096 | return -EINVAL; |
5097 | ||
d55e5f5b JA |
5098 | accept->addr = u64_to_user_ptr(READ_ONCE(sqe->addr)); |
5099 | accept->addr_len = u64_to_user_ptr(READ_ONCE(sqe->addr2)); | |
8ed8d3c3 | 5100 | accept->flags = READ_ONCE(sqe->accept_flags); |
09952e3e | 5101 | accept->nofile = rlimit(RLIMIT_NOFILE); |
a7083ad5 | 5102 | |
aaa4db12 PB |
5103 | accept->file_slot = READ_ONCE(sqe->file_index); |
5104 | if (accept->file_slot && ((req->open.how.flags & O_CLOEXEC) || | |
5105 | (accept->flags & SOCK_CLOEXEC))) | |
5106 | return -EINVAL; | |
a7083ad5 PB |
5107 | if (accept->flags & ~(SOCK_CLOEXEC | SOCK_NONBLOCK)) |
5108 | return -EINVAL; | |
5109 | if (SOCK_NONBLOCK != O_NONBLOCK && (accept->flags & SOCK_NONBLOCK)) | |
5110 | accept->flags = (accept->flags & ~SOCK_NONBLOCK) | O_NONBLOCK; | |
8ed8d3c3 | 5111 | return 0; |
8ed8d3c3 | 5112 | } |
17f2fe35 | 5113 | |
889fca73 | 5114 | static int io_accept(struct io_kiocb *req, unsigned int issue_flags) |
8ed8d3c3 JA |
5115 | { |
5116 | struct io_accept *accept = &req->accept; | |
45d189c6 | 5117 | bool force_nonblock = issue_flags & IO_URING_F_NONBLOCK; |
ac45abc0 | 5118 | unsigned int file_flags = force_nonblock ? O_NONBLOCK : 0; |
aaa4db12 | 5119 | bool fixed = !!accept->file_slot; |
a7083ad5 PB |
5120 | struct file *file; |
5121 | int ret, fd; | |
8ed8d3c3 | 5122 | |
e697deed JX |
5123 | if (req->file->f_flags & O_NONBLOCK) |
5124 | req->flags |= REQ_F_NOWAIT; | |
5125 | ||
aaa4db12 PB |
5126 | if (!fixed) { |
5127 | fd = __get_unused_fd_flags(accept->flags, accept->nofile); | |
5128 | if (unlikely(fd < 0)) | |
5129 | return fd; | |
5130 | } | |
a7083ad5 PB |
5131 | file = do_accept(req->file, file_flags, accept->addr, accept->addr_len, |
5132 | accept->flags); | |
5133 | if (IS_ERR(file)) { | |
aaa4db12 PB |
5134 | if (!fixed) |
5135 | put_unused_fd(fd); | |
a7083ad5 PB |
5136 | ret = PTR_ERR(file); |
5137 | if (ret == -EAGAIN && force_nonblock) | |
5138 | return -EAGAIN; | |
ac45abc0 PB |
5139 | if (ret == -ERESTARTSYS) |
5140 | ret = -EINTR; | |
93d2bcd2 | 5141 | req_set_fail(req); |
aaa4db12 | 5142 | } else if (!fixed) { |
a7083ad5 PB |
5143 | fd_install(fd, file); |
5144 | ret = fd; | |
aaa4db12 PB |
5145 | } else { |
5146 | ret = io_install_fixed_file(req, file, issue_flags, | |
5147 | accept->file_slot - 1); | |
ac45abc0 | 5148 | } |
889fca73 | 5149 | __io_req_complete(req, issue_flags, ret, 0); |
17f2fe35 | 5150 | return 0; |
8ed8d3c3 JA |
5151 | } |
5152 | ||
93642ef8 PB |
5153 | static int io_connect_prep_async(struct io_kiocb *req) |
5154 | { | |
5155 | struct io_async_connect *io = req->async_data; | |
5156 | struct io_connect *conn = &req->connect; | |
5157 | ||
5158 | return move_addr_to_kernel(conn->addr, conn->addr_len, &io->address); | |
5159 | } | |
5160 | ||
3529d8c2 | 5161 | static int io_connect_prep(struct io_kiocb *req, const struct io_uring_sqe *sqe) |
f499a021 | 5162 | { |
3529d8c2 | 5163 | struct io_connect *conn = &req->connect; |
f499a021 | 5164 | |
14587a46 | 5165 | if (unlikely(req->ctx->flags & IORING_SETUP_IOPOLL)) |
3fbb51c1 | 5166 | return -EINVAL; |
26578cda PB |
5167 | if (sqe->ioprio || sqe->len || sqe->buf_index || sqe->rw_flags || |
5168 | sqe->splice_fd_in) | |
3fbb51c1 JA |
5169 | return -EINVAL; |
5170 | ||
3529d8c2 JA |
5171 | conn->addr = u64_to_user_ptr(READ_ONCE(sqe->addr)); |
5172 | conn->addr_len = READ_ONCE(sqe->addr2); | |
93642ef8 | 5173 | return 0; |
f499a021 JA |
5174 | } |
5175 | ||
889fca73 | 5176 | static int io_connect(struct io_kiocb *req, unsigned int issue_flags) |
f8e85cf2 | 5177 | { |
e8c2bc1f | 5178 | struct io_async_connect __io, *io; |
f8e85cf2 | 5179 | unsigned file_flags; |
3fbb51c1 | 5180 | int ret; |
45d189c6 | 5181 | bool force_nonblock = issue_flags & IO_URING_F_NONBLOCK; |
f8e85cf2 | 5182 | |
e8c2bc1f JA |
5183 | if (req->async_data) { |
5184 | io = req->async_data; | |
f499a021 | 5185 | } else { |
3529d8c2 JA |
5186 | ret = move_addr_to_kernel(req->connect.addr, |
5187 | req->connect.addr_len, | |
e8c2bc1f | 5188 | &__io.address); |
f499a021 JA |
5189 | if (ret) |
5190 | goto out; | |
5191 | io = &__io; | |
5192 | } | |
5193 | ||
3fbb51c1 JA |
5194 | file_flags = force_nonblock ? O_NONBLOCK : 0; |
5195 | ||
e8c2bc1f | 5196 | ret = __sys_connect_file(req->file, &io->address, |
3fbb51c1 | 5197 | req->connect.addr_len, file_flags); |
87f80d62 | 5198 | if ((ret == -EAGAIN || ret == -EINPROGRESS) && force_nonblock) { |
e8c2bc1f | 5199 | if (req->async_data) |
b7bb4f7d | 5200 | return -EAGAIN; |
e8c2bc1f | 5201 | if (io_alloc_async_data(req)) { |
f499a021 JA |
5202 | ret = -ENOMEM; |
5203 | goto out; | |
5204 | } | |
e8c2bc1f | 5205 | memcpy(req->async_data, &__io, sizeof(__io)); |
f8e85cf2 | 5206 | return -EAGAIN; |
f499a021 | 5207 | } |
f8e85cf2 JA |
5208 | if (ret == -ERESTARTSYS) |
5209 | ret = -EINTR; | |
f499a021 | 5210 | out: |
4e88d6e7 | 5211 | if (ret < 0) |
93d2bcd2 | 5212 | req_set_fail(req); |
889fca73 | 5213 | __io_req_complete(req, issue_flags, ret, 0); |
f8e85cf2 | 5214 | return 0; |
469956e8 Y |
5215 | } |
5216 | #else /* !CONFIG_NET */ | |
99a10081 JA |
5217 | #define IO_NETOP_FN(op) \ |
5218 | static int io_##op(struct io_kiocb *req, unsigned int issue_flags) \ | |
5219 | { \ | |
5220 | return -EOPNOTSUPP; \ | |
5221 | } | |
5222 | ||
5223 | #define IO_NETOP_PREP(op) \ | |
5224 | IO_NETOP_FN(op) \ | |
5225 | static int io_##op##_prep(struct io_kiocb *req, const struct io_uring_sqe *sqe) \ | |
5226 | { \ | |
5227 | return -EOPNOTSUPP; \ | |
5228 | } \ | |
5229 | ||
5230 | #define IO_NETOP_PREP_ASYNC(op) \ | |
5231 | IO_NETOP_PREP(op) \ | |
5232 | static int io_##op##_prep_async(struct io_kiocb *req) \ | |
5233 | { \ | |
5234 | return -EOPNOTSUPP; \ | |
5235 | } | |
5236 | ||
5237 | IO_NETOP_PREP_ASYNC(sendmsg); | |
5238 | IO_NETOP_PREP_ASYNC(recvmsg); | |
5239 | IO_NETOP_PREP_ASYNC(connect); | |
5240 | IO_NETOP_PREP(accept); | |
5241 | IO_NETOP_FN(send); | |
5242 | IO_NETOP_FN(recv); | |
469956e8 | 5243 | #endif /* CONFIG_NET */ |
f8e85cf2 | 5244 | |
d7718a9d JA |
5245 | struct io_poll_table { |
5246 | struct poll_table_struct pt; | |
5247 | struct io_kiocb *req; | |
68b11e8b | 5248 | int nr_entries; |
d7718a9d JA |
5249 | int error; |
5250 | }; | |
ce593a6c | 5251 | |
d7718a9d | 5252 | static int __io_async_wake(struct io_kiocb *req, struct io_poll_iocb *poll, |
5b0a6acc | 5253 | __poll_t mask, io_req_tw_func_t func) |
d7718a9d | 5254 | { |
d7718a9d JA |
5255 | /* for instances that support it check for an event match first: */ |
5256 | if (mask && !(mask & poll->events)) | |
5257 | return 0; | |
5258 | ||
5259 | trace_io_uring_task_add(req->ctx, req->opcode, req->user_data, mask); | |
5260 | ||
5261 | list_del_init(&poll->wait.entry); | |
5262 | ||
d7718a9d | 5263 | req->result = mask; |
5b0a6acc | 5264 | req->io_task_work.func = func; |
6d816e08 | 5265 | |
d7718a9d | 5266 | /* |
e3aabf95 JA |
5267 | * If this fails, then the task is exiting. When a task exits, the |
5268 | * work gets canceled, so just cancel this request as well instead | |
5269 | * of executing it. We can't safely execute it anyway, as we may not | |
5270 | * have the needed state needed for it anyway. | |
d7718a9d | 5271 | */ |
e09ee510 | 5272 | io_req_task_work_add(req); |
d7718a9d JA |
5273 | return 1; |
5274 | } | |
5275 | ||
74ce6ce4 JA |
5276 | static bool io_poll_rewait(struct io_kiocb *req, struct io_poll_iocb *poll) |
5277 | __acquires(&req->ctx->completion_lock) | |
5278 | { | |
5279 | struct io_ring_ctx *ctx = req->ctx; | |
5280 | ||
316319e8 | 5281 | /* req->task == current here, checking PF_EXITING is safe */ |
e09ee510 PB |
5282 | if (unlikely(req->task->flags & PF_EXITING)) |
5283 | WRITE_ONCE(poll->canceled, true); | |
5284 | ||
74ce6ce4 JA |
5285 | if (!req->result && !READ_ONCE(poll->canceled)) { |
5286 | struct poll_table_struct pt = { ._key = poll->events }; | |
5287 | ||
5288 | req->result = vfs_poll(req->file, &pt) & poll->events; | |
5289 | } | |
5290 | ||
79ebeaee | 5291 | spin_lock(&ctx->completion_lock); |
74ce6ce4 JA |
5292 | if (!req->result && !READ_ONCE(poll->canceled)) { |
5293 | add_wait_queue(poll->head, &poll->wait); | |
5294 | return true; | |
5295 | } | |
5296 | ||
5297 | return false; | |
5298 | } | |
5299 | ||
d4e7cd36 | 5300 | static struct io_poll_iocb *io_poll_get_double(struct io_kiocb *req) |
18bceab1 | 5301 | { |
e8c2bc1f | 5302 | /* pure poll stashes this in ->async_data, poll driven retry elsewhere */ |
d4e7cd36 | 5303 | if (req->opcode == IORING_OP_POLL_ADD) |
e8c2bc1f | 5304 | return req->async_data; |
d4e7cd36 JA |
5305 | return req->apoll->double_poll; |
5306 | } | |
5307 | ||
5308 | static struct io_poll_iocb *io_poll_get_single(struct io_kiocb *req) | |
5309 | { | |
5310 | if (req->opcode == IORING_OP_POLL_ADD) | |
5311 | return &req->poll; | |
5312 | return &req->apoll->poll; | |
5313 | } | |
5314 | ||
5315 | static void io_poll_remove_double(struct io_kiocb *req) | |
e07785b0 | 5316 | __must_hold(&req->ctx->completion_lock) |
d4e7cd36 JA |
5317 | { |
5318 | struct io_poll_iocb *poll = io_poll_get_double(req); | |
18bceab1 JA |
5319 | |
5320 | lockdep_assert_held(&req->ctx->completion_lock); | |
5321 | ||
5322 | if (poll && poll->head) { | |
5323 | struct wait_queue_head *head = poll->head; | |
5324 | ||
79ebeaee | 5325 | spin_lock_irq(&head->lock); |
18bceab1 JA |
5326 | list_del_init(&poll->wait.entry); |
5327 | if (poll->wait.private) | |
de9b4cca | 5328 | req_ref_put(req); |
18bceab1 | 5329 | poll->head = NULL; |
79ebeaee | 5330 | spin_unlock_irq(&head->lock); |
18bceab1 JA |
5331 | } |
5332 | } | |
5333 | ||
31efe48e | 5334 | static bool __io_poll_complete(struct io_kiocb *req, __poll_t mask) |
e07785b0 | 5335 | __must_hold(&req->ctx->completion_lock) |
18bceab1 JA |
5336 | { |
5337 | struct io_ring_ctx *ctx = req->ctx; | |
88e41cf9 | 5338 | unsigned flags = IORING_CQE_F_MORE; |
e27414be | 5339 | int error; |
18bceab1 | 5340 | |
e27414be | 5341 | if (READ_ONCE(req->poll.canceled)) { |
45ab03b1 | 5342 | error = -ECANCELED; |
88e41cf9 | 5343 | req->poll.events |= EPOLLONESHOT; |
e27414be | 5344 | } else { |
5082620f | 5345 | error = mangle_poll(mask); |
e27414be | 5346 | } |
b69de288 JA |
5347 | if (req->poll.events & EPOLLONESHOT) |
5348 | flags = 0; | |
a62682f9 HX |
5349 | if (!io_cqring_fill_event(ctx, req->user_data, error, flags)) { |
5350 | req->poll.events |= EPOLLONESHOT; | |
88e41cf9 | 5351 | flags = 0; |
a62682f9 | 5352 | } |
7b289c38 HX |
5353 | if (flags & IORING_CQE_F_MORE) |
5354 | ctx->cq_extra++; | |
18bceab1 | 5355 | |
88e41cf9 | 5356 | return !(flags & IORING_CQE_F_MORE); |
18bceab1 JA |
5357 | } |
5358 | ||
31efe48e XW |
5359 | static inline bool io_poll_complete(struct io_kiocb *req, __poll_t mask) |
5360 | __must_hold(&req->ctx->completion_lock) | |
5361 | { | |
5362 | bool done; | |
5363 | ||
5364 | done = __io_poll_complete(req, mask); | |
5365 | io_commit_cqring(req->ctx); | |
5366 | return done; | |
5367 | } | |
5368 | ||
f237c30a | 5369 | static void io_poll_task_func(struct io_kiocb *req, bool *locked) |
18bceab1 JA |
5370 | { |
5371 | struct io_ring_ctx *ctx = req->ctx; | |
dd221f46 | 5372 | struct io_kiocb *nxt; |
18bceab1 JA |
5373 | |
5374 | if (io_poll_rewait(req, &req->poll)) { | |
79ebeaee | 5375 | spin_unlock(&ctx->completion_lock); |
dd221f46 | 5376 | } else { |
f40b964a | 5377 | bool done; |
18bceab1 | 5378 | |
5b7aa38d HX |
5379 | if (req->poll.done) { |
5380 | spin_unlock(&ctx->completion_lock); | |
5381 | return; | |
5382 | } | |
31efe48e | 5383 | done = __io_poll_complete(req, req->result); |
88e41cf9 | 5384 | if (done) { |
a890d01e | 5385 | io_poll_remove_double(req); |
88e41cf9 | 5386 | hash_del(&req->hash_node); |
bd99c71b | 5387 | req->poll.done = true; |
f40b964a | 5388 | } else { |
88e41cf9 JA |
5389 | req->result = 0; |
5390 | add_wait_queue(req->poll.head, &req->poll.wait); | |
5391 | } | |
31efe48e | 5392 | io_commit_cqring(ctx); |
79ebeaee | 5393 | spin_unlock(&ctx->completion_lock); |
dd221f46 | 5394 | io_cqring_ev_posted(ctx); |
18bceab1 | 5395 | |
88e41cf9 JA |
5396 | if (done) { |
5397 | nxt = io_put_req_find_next(req); | |
5398 | if (nxt) | |
f237c30a | 5399 | io_req_task_submit(nxt, locked); |
88e41cf9 | 5400 | } |
dd221f46 | 5401 | } |
18bceab1 JA |
5402 | } |
5403 | ||
5404 | static int io_poll_double_wake(struct wait_queue_entry *wait, unsigned mode, | |
5405 | int sync, void *key) | |
5406 | { | |
5407 | struct io_kiocb *req = wait->private; | |
d4e7cd36 | 5408 | struct io_poll_iocb *poll = io_poll_get_single(req); |
18bceab1 | 5409 | __poll_t mask = key_to_poll(key); |
79ebeaee | 5410 | unsigned long flags; |
18bceab1 JA |
5411 | |
5412 | /* for instances that support it check for an event match first: */ | |
5413 | if (mask && !(mask & poll->events)) | |
5414 | return 0; | |
88e41cf9 JA |
5415 | if (!(poll->events & EPOLLONESHOT)) |
5416 | return poll->wait.func(&poll->wait, mode, sync, key); | |
18bceab1 | 5417 | |
8706e04e JA |
5418 | list_del_init(&wait->entry); |
5419 | ||
9ce85ef2 | 5420 | if (poll->head) { |
18bceab1 JA |
5421 | bool done; |
5422 | ||
79ebeaee | 5423 | spin_lock_irqsave(&poll->head->lock, flags); |
807abcb0 | 5424 | done = list_empty(&poll->wait.entry); |
18bceab1 | 5425 | if (!done) |
807abcb0 | 5426 | list_del_init(&poll->wait.entry); |
d4e7cd36 JA |
5427 | /* make sure double remove sees this as being gone */ |
5428 | wait->private = NULL; | |
79ebeaee | 5429 | spin_unlock_irqrestore(&poll->head->lock, flags); |
c8b5e260 JA |
5430 | if (!done) { |
5431 | /* use wait func handler, so it matches the rq type */ | |
5432 | poll->wait.func(&poll->wait, mode, sync, key); | |
5433 | } | |
18bceab1 | 5434 | } |
de9b4cca | 5435 | req_ref_put(req); |
18bceab1 JA |
5436 | return 1; |
5437 | } | |
5438 | ||
5439 | static void io_init_poll_iocb(struct io_poll_iocb *poll, __poll_t events, | |
5440 | wait_queue_func_t wake_func) | |
5441 | { | |
5442 | poll->head = NULL; | |
5443 | poll->done = false; | |
5444 | poll->canceled = false; | |
464dca61 JA |
5445 | #define IO_POLL_UNMASK (EPOLLERR|EPOLLHUP|EPOLLNVAL|EPOLLRDHUP) |
5446 | /* mask in events that we always want/need */ | |
5447 | poll->events = events | IO_POLL_UNMASK; | |
18bceab1 JA |
5448 | INIT_LIST_HEAD(&poll->wait.entry); |
5449 | init_waitqueue_func_entry(&poll->wait, wake_func); | |
5450 | } | |
5451 | ||
5452 | static void __io_queue_proc(struct io_poll_iocb *poll, struct io_poll_table *pt, | |
807abcb0 JA |
5453 | struct wait_queue_head *head, |
5454 | struct io_poll_iocb **poll_ptr) | |
18bceab1 JA |
5455 | { |
5456 | struct io_kiocb *req = pt->req; | |
5457 | ||
5458 | /* | |
68b11e8b PB |
5459 | * The file being polled uses multiple waitqueues for poll handling |
5460 | * (e.g. one for read, one for write). Setup a separate io_poll_iocb | |
5461 | * if this happens. | |
18bceab1 | 5462 | */ |
68b11e8b | 5463 | if (unlikely(pt->nr_entries)) { |
58852d4d PB |
5464 | struct io_poll_iocb *poll_one = poll; |
5465 | ||
23a65db8 PB |
5466 | /* double add on the same waitqueue head, ignore */ |
5467 | if (poll_one->head == head) | |
5468 | return; | |
18bceab1 | 5469 | /* already have a 2nd entry, fail a third attempt */ |
807abcb0 | 5470 | if (*poll_ptr) { |
23a65db8 PB |
5471 | if ((*poll_ptr)->head == head) |
5472 | return; | |
18bceab1 JA |
5473 | pt->error = -EINVAL; |
5474 | return; | |
5475 | } | |
ea6a693d JA |
5476 | /* |
5477 | * Can't handle multishot for double wait for now, turn it | |
5478 | * into one-shot mode. | |
5479 | */ | |
7a274727 PB |
5480 | if (!(poll_one->events & EPOLLONESHOT)) |
5481 | poll_one->events |= EPOLLONESHOT; | |
18bceab1 JA |
5482 | poll = kmalloc(sizeof(*poll), GFP_ATOMIC); |
5483 | if (!poll) { | |
5484 | pt->error = -ENOMEM; | |
5485 | return; | |
5486 | } | |
58852d4d | 5487 | io_init_poll_iocb(poll, poll_one->events, io_poll_double_wake); |
de9b4cca | 5488 | req_ref_get(req); |
18bceab1 | 5489 | poll->wait.private = req; |
807abcb0 | 5490 | *poll_ptr = poll; |
18bceab1 JA |
5491 | } |
5492 | ||
68b11e8b | 5493 | pt->nr_entries++; |
18bceab1 | 5494 | poll->head = head; |
a31eb4a2 JX |
5495 | |
5496 | if (poll->events & EPOLLEXCLUSIVE) | |
5497 | add_wait_queue_exclusive(head, &poll->wait); | |
5498 | else | |
5499 | add_wait_queue(head, &poll->wait); | |
18bceab1 JA |
5500 | } |
5501 | ||
5502 | static void io_async_queue_proc(struct file *file, struct wait_queue_head *head, | |
5503 | struct poll_table_struct *p) | |
5504 | { | |
5505 | struct io_poll_table *pt = container_of(p, struct io_poll_table, pt); | |
807abcb0 | 5506 | struct async_poll *apoll = pt->req->apoll; |
18bceab1 | 5507 | |
807abcb0 | 5508 | __io_queue_proc(&apoll->poll, pt, head, &apoll->double_poll); |
18bceab1 JA |
5509 | } |
5510 | ||
f237c30a | 5511 | static void io_async_task_func(struct io_kiocb *req, bool *locked) |
d7718a9d | 5512 | { |
d7718a9d JA |
5513 | struct async_poll *apoll = req->apoll; |
5514 | struct io_ring_ctx *ctx = req->ctx; | |
5515 | ||
236daeae | 5516 | trace_io_uring_task_run(req->ctx, req, req->opcode, req->user_data); |
d7718a9d | 5517 | |
74ce6ce4 | 5518 | if (io_poll_rewait(req, &apoll->poll)) { |
79ebeaee | 5519 | spin_unlock(&ctx->completion_lock); |
74ce6ce4 | 5520 | return; |
d7718a9d JA |
5521 | } |
5522 | ||
0ea13b44 | 5523 | hash_del(&req->hash_node); |
d4e7cd36 | 5524 | io_poll_remove_double(req); |
bd99c71b | 5525 | apoll->poll.done = true; |
79ebeaee | 5526 | spin_unlock(&ctx->completion_lock); |
74ce6ce4 | 5527 | |
0be0b0e3 | 5528 | if (!READ_ONCE(apoll->poll.canceled)) |
f237c30a | 5529 | io_req_task_submit(req, locked); |
0be0b0e3 | 5530 | else |
2593553a | 5531 | io_req_complete_failed(req, -ECANCELED); |
d7718a9d JA |
5532 | } |
5533 | ||
5534 | static int io_async_wake(struct wait_queue_entry *wait, unsigned mode, int sync, | |
5535 | void *key) | |
5536 | { | |
5537 | struct io_kiocb *req = wait->private; | |
5538 | struct io_poll_iocb *poll = &req->apoll->poll; | |
5539 | ||
5540 | trace_io_uring_poll_wake(req->ctx, req->opcode, req->user_data, | |
5541 | key_to_poll(key)); | |
5542 | ||
5543 | return __io_async_wake(req, poll, key_to_poll(key), io_async_task_func); | |
5544 | } | |
5545 | ||
5546 | static void io_poll_req_insert(struct io_kiocb *req) | |
5547 | { | |
5548 | struct io_ring_ctx *ctx = req->ctx; | |
5549 | struct hlist_head *list; | |
5550 | ||
5551 | list = &ctx->cancel_hash[hash_long(req->user_data, ctx->cancel_hash_bits)]; | |
5552 | hlist_add_head(&req->hash_node, list); | |
5553 | } | |
5554 | ||
5555 | static __poll_t __io_arm_poll_handler(struct io_kiocb *req, | |
5556 | struct io_poll_iocb *poll, | |
5557 | struct io_poll_table *ipt, __poll_t mask, | |
5558 | wait_queue_func_t wake_func) | |
5559 | __acquires(&ctx->completion_lock) | |
5560 | { | |
5561 | struct io_ring_ctx *ctx = req->ctx; | |
5562 | bool cancel = false; | |
5563 | ||
4d52f338 | 5564 | INIT_HLIST_NODE(&req->hash_node); |
18bceab1 | 5565 | io_init_poll_iocb(poll, mask, wake_func); |
b90cd197 | 5566 | poll->file = req->file; |
18bceab1 | 5567 | poll->wait.private = req; |
d7718a9d JA |
5568 | |
5569 | ipt->pt._key = mask; | |
5570 | ipt->req = req; | |
68b11e8b PB |
5571 | ipt->error = 0; |
5572 | ipt->nr_entries = 0; | |
d7718a9d | 5573 | |
d7718a9d | 5574 | mask = vfs_poll(req->file, &ipt->pt) & poll->events; |
68b11e8b PB |
5575 | if (unlikely(!ipt->nr_entries) && !ipt->error) |
5576 | ipt->error = -EINVAL; | |
d7718a9d | 5577 | |
79ebeaee | 5578 | spin_lock(&ctx->completion_lock); |
a890d01e | 5579 | if (ipt->error || (mask && (poll->events & EPOLLONESHOT))) |
46fee9ab | 5580 | io_poll_remove_double(req); |
d7718a9d | 5581 | if (likely(poll->head)) { |
79ebeaee | 5582 | spin_lock_irq(&poll->head->lock); |
d7718a9d JA |
5583 | if (unlikely(list_empty(&poll->wait.entry))) { |
5584 | if (ipt->error) | |
5585 | cancel = true; | |
5586 | ipt->error = 0; | |
5587 | mask = 0; | |
5588 | } | |
88e41cf9 | 5589 | if ((mask && (poll->events & EPOLLONESHOT)) || ipt->error) |
d7718a9d JA |
5590 | list_del_init(&poll->wait.entry); |
5591 | else if (cancel) | |
5592 | WRITE_ONCE(poll->canceled, true); | |
5593 | else if (!poll->done) /* actually waiting for an event */ | |
5594 | io_poll_req_insert(req); | |
79ebeaee | 5595 | spin_unlock_irq(&poll->head->lock); |
d7718a9d JA |
5596 | } |
5597 | ||
5598 | return mask; | |
5599 | } | |
5600 | ||
59b735ae OL |
5601 | enum { |
5602 | IO_APOLL_OK, | |
5603 | IO_APOLL_ABORTED, | |
5604 | IO_APOLL_READY | |
5605 | }; | |
5606 | ||
5607 | static int io_arm_poll_handler(struct io_kiocb *req) | |
d7718a9d JA |
5608 | { |
5609 | const struct io_op_def *def = &io_op_defs[req->opcode]; | |
5610 | struct io_ring_ctx *ctx = req->ctx; | |
5611 | struct async_poll *apoll; | |
5612 | struct io_poll_table ipt; | |
b2d9c3da | 5613 | __poll_t ret, mask = EPOLLONESHOT | POLLERR | POLLPRI; |
9dab14b8 | 5614 | int rw; |
d7718a9d JA |
5615 | |
5616 | if (!req->file || !file_can_poll(req->file)) | |
59b735ae | 5617 | return IO_APOLL_ABORTED; |
24c74678 | 5618 | if (req->flags & REQ_F_POLLED) |
59b735ae | 5619 | return IO_APOLL_ABORTED; |
b2d9c3da PB |
5620 | if (!def->pollin && !def->pollout) |
5621 | return IO_APOLL_ABORTED; | |
5622 | ||
5623 | if (def->pollin) { | |
9dab14b8 | 5624 | rw = READ; |
b2d9c3da PB |
5625 | mask |= POLLIN | POLLRDNORM; |
5626 | ||
5627 | /* If reading from MSG_ERRQUEUE using recvmsg, ignore POLLIN */ | |
5628 | if ((req->opcode == IORING_OP_RECVMSG) && | |
5629 | (req->sr_msg.msg_flags & MSG_ERRQUEUE)) | |
5630 | mask &= ~POLLIN; | |
5631 | } else { | |
9dab14b8 | 5632 | rw = WRITE; |
b2d9c3da PB |
5633 | mask |= POLLOUT | POLLWRNORM; |
5634 | } | |
5635 | ||
9dab14b8 | 5636 | /* if we can't nonblock try, then no point in arming a poll handler */ |
b191e2df | 5637 | if (!io_file_supports_nowait(req, rw)) |
59b735ae | 5638 | return IO_APOLL_ABORTED; |
d7718a9d JA |
5639 | |
5640 | apoll = kmalloc(sizeof(*apoll), GFP_ATOMIC); | |
5641 | if (unlikely(!apoll)) | |
59b735ae | 5642 | return IO_APOLL_ABORTED; |
807abcb0 | 5643 | apoll->double_poll = NULL; |
d7718a9d | 5644 | req->apoll = apoll; |
b2d9c3da | 5645 | req->flags |= REQ_F_POLLED; |
d7718a9d | 5646 | ipt.pt._qproc = io_async_queue_proc; |
48dcd38d | 5647 | io_req_set_refcount(req); |
d7718a9d JA |
5648 | |
5649 | ret = __io_arm_poll_handler(req, &apoll->poll, &ipt, mask, | |
5650 | io_async_wake); | |
79ebeaee | 5651 | spin_unlock(&ctx->completion_lock); |
41a5169c HX |
5652 | if (ret || ipt.error) |
5653 | return ret ? IO_APOLL_READY : IO_APOLL_ABORTED; | |
5654 | ||
236daeae OL |
5655 | trace_io_uring_poll_arm(ctx, req, req->opcode, req->user_data, |
5656 | mask, apoll->poll.events); | |
59b735ae | 5657 | return IO_APOLL_OK; |
d7718a9d JA |
5658 | } |
5659 | ||
5660 | static bool __io_poll_remove_one(struct io_kiocb *req, | |
b2e720ac | 5661 | struct io_poll_iocb *poll, bool do_cancel) |
e07785b0 | 5662 | __must_hold(&req->ctx->completion_lock) |
221c5eb2 | 5663 | { |
b41e9852 | 5664 | bool do_complete = false; |
221c5eb2 | 5665 | |
5082620f JA |
5666 | if (!poll->head) |
5667 | return false; | |
79ebeaee | 5668 | spin_lock_irq(&poll->head->lock); |
b2e720ac JA |
5669 | if (do_cancel) |
5670 | WRITE_ONCE(poll->canceled, true); | |
392edb45 JA |
5671 | if (!list_empty(&poll->wait.entry)) { |
5672 | list_del_init(&poll->wait.entry); | |
b41e9852 | 5673 | do_complete = true; |
221c5eb2 | 5674 | } |
79ebeaee | 5675 | spin_unlock_irq(&poll->head->lock); |
3bfa5bcb | 5676 | hash_del(&req->hash_node); |
d7718a9d JA |
5677 | return do_complete; |
5678 | } | |
5679 | ||
5d709043 | 5680 | static bool io_poll_remove_one(struct io_kiocb *req) |
e07785b0 | 5681 | __must_hold(&req->ctx->completion_lock) |
d7718a9d JA |
5682 | { |
5683 | bool do_complete; | |
5684 | ||
d4e7cd36 | 5685 | io_poll_remove_double(req); |
e31001a3 | 5686 | do_complete = __io_poll_remove_one(req, io_poll_get_single(req), true); |
d4e7cd36 | 5687 | |
b41e9852 | 5688 | if (do_complete) { |
d4d19c19 | 5689 | io_cqring_fill_event(req->ctx, req->user_data, -ECANCELED, 0); |
b41e9852 | 5690 | io_commit_cqring(req->ctx); |
93d2bcd2 | 5691 | req_set_fail(req); |
91c2f697 | 5692 | io_put_req_deferred(req); |
5d709043 | 5693 | } |
b41e9852 | 5694 | return do_complete; |
221c5eb2 JA |
5695 | } |
5696 | ||
76e1b642 JA |
5697 | /* |
5698 | * Returns true if we found and killed one or more poll requests | |
5699 | */ | |
6b81928d | 5700 | static bool io_poll_remove_all(struct io_ring_ctx *ctx, struct task_struct *tsk, |
3dd0c97a | 5701 | bool cancel_all) |
221c5eb2 | 5702 | { |
78076bb6 | 5703 | struct hlist_node *tmp; |
221c5eb2 | 5704 | struct io_kiocb *req; |
8e2e1faf | 5705 | int posted = 0, i; |
221c5eb2 | 5706 | |
79ebeaee | 5707 | spin_lock(&ctx->completion_lock); |
78076bb6 JA |
5708 | for (i = 0; i < (1U << ctx->cancel_hash_bits); i++) { |
5709 | struct hlist_head *list; | |
5710 | ||
5711 | list = &ctx->cancel_hash[i]; | |
f3606e3a | 5712 | hlist_for_each_entry_safe(req, tmp, list, hash_node) { |
3dd0c97a | 5713 | if (io_match_task(req, tsk, cancel_all)) |
f3606e3a JA |
5714 | posted += io_poll_remove_one(req); |
5715 | } | |
221c5eb2 | 5716 | } |
79ebeaee | 5717 | spin_unlock(&ctx->completion_lock); |
b41e9852 | 5718 | |
8e2e1faf JA |
5719 | if (posted) |
5720 | io_cqring_ev_posted(ctx); | |
76e1b642 JA |
5721 | |
5722 | return posted != 0; | |
221c5eb2 JA |
5723 | } |
5724 | ||
9ba5fac8 PB |
5725 | static struct io_kiocb *io_poll_find(struct io_ring_ctx *ctx, __u64 sqe_addr, |
5726 | bool poll_only) | |
e07785b0 | 5727 | __must_hold(&ctx->completion_lock) |
47f46768 | 5728 | { |
78076bb6 | 5729 | struct hlist_head *list; |
47f46768 JA |
5730 | struct io_kiocb *req; |
5731 | ||
78076bb6 JA |
5732 | list = &ctx->cancel_hash[hash_long(sqe_addr, ctx->cancel_hash_bits)]; |
5733 | hlist_for_each_entry(req, list, hash_node) { | |
b41e9852 JA |
5734 | if (sqe_addr != req->user_data) |
5735 | continue; | |
9ba5fac8 PB |
5736 | if (poll_only && req->opcode != IORING_OP_POLL_ADD) |
5737 | continue; | |
b2cb805f | 5738 | return req; |
47f46768 | 5739 | } |
b2cb805f JA |
5740 | return NULL; |
5741 | } | |
5742 | ||
9ba5fac8 PB |
5743 | static int io_poll_cancel(struct io_ring_ctx *ctx, __u64 sqe_addr, |
5744 | bool poll_only) | |
e07785b0 | 5745 | __must_hold(&ctx->completion_lock) |
b2cb805f JA |
5746 | { |
5747 | struct io_kiocb *req; | |
5748 | ||
9ba5fac8 | 5749 | req = io_poll_find(ctx, sqe_addr, poll_only); |
b2cb805f JA |
5750 | if (!req) |
5751 | return -ENOENT; | |
5752 | if (io_poll_remove_one(req)) | |
5753 | return 0; | |
5754 | ||
5755 | return -EALREADY; | |
47f46768 JA |
5756 | } |
5757 | ||
9096af3e PB |
5758 | static __poll_t io_poll_parse_events(const struct io_uring_sqe *sqe, |
5759 | unsigned int flags) | |
5760 | { | |
5761 | u32 events; | |
47f46768 | 5762 | |
9096af3e PB |
5763 | events = READ_ONCE(sqe->poll32_events); |
5764 | #ifdef __BIG_ENDIAN | |
5765 | events = swahw32(events); | |
5766 | #endif | |
5767 | if (!(flags & IORING_POLL_ADD_MULTI)) | |
5768 | events |= EPOLLONESHOT; | |
5769 | return demangle_poll(events) | (events & (EPOLLEXCLUSIVE|EPOLLONESHOT)); | |
47f46768 JA |
5770 | } |
5771 | ||
c5de0036 | 5772 | static int io_poll_update_prep(struct io_kiocb *req, |
3529d8c2 | 5773 | const struct io_uring_sqe *sqe) |
0969e783 | 5774 | { |
c5de0036 PB |
5775 | struct io_poll_update *upd = &req->poll_update; |
5776 | u32 flags; | |
5777 | ||
0969e783 JA |
5778 | if (unlikely(req->ctx->flags & IORING_SETUP_IOPOLL)) |
5779 | return -EINVAL; | |
26578cda | 5780 | if (sqe->ioprio || sqe->buf_index || sqe->splice_fd_in) |
c5de0036 PB |
5781 | return -EINVAL; |
5782 | flags = READ_ONCE(sqe->len); | |
5783 | if (flags & ~(IORING_POLL_UPDATE_EVENTS | IORING_POLL_UPDATE_USER_DATA | | |
5784 | IORING_POLL_ADD_MULTI)) | |
5785 | return -EINVAL; | |
5786 | /* meaningless without update */ | |
5787 | if (flags == IORING_POLL_ADD_MULTI) | |
0969e783 JA |
5788 | return -EINVAL; |
5789 | ||
c5de0036 PB |
5790 | upd->old_user_data = READ_ONCE(sqe->addr); |
5791 | upd->update_events = flags & IORING_POLL_UPDATE_EVENTS; | |
5792 | upd->update_user_data = flags & IORING_POLL_UPDATE_USER_DATA; | |
221c5eb2 | 5793 | |
c5de0036 PB |
5794 | upd->new_user_data = READ_ONCE(sqe->off); |
5795 | if (!upd->update_user_data && upd->new_user_data) | |
5796 | return -EINVAL; | |
5797 | if (upd->update_events) | |
5798 | upd->events = io_poll_parse_events(sqe, flags); | |
5799 | else if (sqe->poll32_events) | |
5800 | return -EINVAL; | |
221c5eb2 | 5801 | |
221c5eb2 JA |
5802 | return 0; |
5803 | } | |
5804 | ||
221c5eb2 JA |
5805 | static int io_poll_wake(struct wait_queue_entry *wait, unsigned mode, int sync, |
5806 | void *key) | |
5807 | { | |
c2f2eb7d JA |
5808 | struct io_kiocb *req = wait->private; |
5809 | struct io_poll_iocb *poll = &req->poll; | |
221c5eb2 | 5810 | |
d7718a9d | 5811 | return __io_async_wake(req, poll, key_to_poll(key), io_poll_task_func); |
221c5eb2 JA |
5812 | } |
5813 | ||
221c5eb2 JA |
5814 | static void io_poll_queue_proc(struct file *file, struct wait_queue_head *head, |
5815 | struct poll_table_struct *p) | |
5816 | { | |
5817 | struct io_poll_table *pt = container_of(p, struct io_poll_table, pt); | |
5818 | ||
e8c2bc1f | 5819 | __io_queue_proc(&pt->req->poll, pt, head, (struct io_poll_iocb **) &pt->req->async_data); |
eac406c6 JA |
5820 | } |
5821 | ||
3529d8c2 | 5822 | static int io_poll_add_prep(struct io_kiocb *req, const struct io_uring_sqe *sqe) |
221c5eb2 JA |
5823 | { |
5824 | struct io_poll_iocb *poll = &req->poll; | |
c5de0036 | 5825 | u32 flags; |
221c5eb2 JA |
5826 | |
5827 | if (unlikely(req->ctx->flags & IORING_SETUP_IOPOLL)) | |
5828 | return -EINVAL; | |
c5de0036 | 5829 | if (sqe->ioprio || sqe->buf_index || sqe->off || sqe->addr) |
88e41cf9 JA |
5830 | return -EINVAL; |
5831 | flags = READ_ONCE(sqe->len); | |
c5de0036 | 5832 | if (flags & ~IORING_POLL_ADD_MULTI) |
221c5eb2 JA |
5833 | return -EINVAL; |
5834 | ||
48dcd38d | 5835 | io_req_set_refcount(req); |
c5de0036 | 5836 | poll->events = io_poll_parse_events(sqe, flags); |
0969e783 JA |
5837 | return 0; |
5838 | } | |
5839 | ||
61e98203 | 5840 | static int io_poll_add(struct io_kiocb *req, unsigned int issue_flags) |
0969e783 JA |
5841 | { |
5842 | struct io_poll_iocb *poll = &req->poll; | |
5843 | struct io_ring_ctx *ctx = req->ctx; | |
5844 | struct io_poll_table ipt; | |
0969e783 | 5845 | __poll_t mask; |
5b7aa38d | 5846 | bool done; |
0969e783 | 5847 | |
d7718a9d | 5848 | ipt.pt._qproc = io_poll_queue_proc; |
36703247 | 5849 | |
d7718a9d JA |
5850 | mask = __io_arm_poll_handler(req, &req->poll, &ipt, poll->events, |
5851 | io_poll_wake); | |
221c5eb2 | 5852 | |
8c838788 | 5853 | if (mask) { /* no async, we'd stolen it */ |
221c5eb2 | 5854 | ipt.error = 0; |
5b7aa38d | 5855 | done = io_poll_complete(req, mask); |
221c5eb2 | 5856 | } |
79ebeaee | 5857 | spin_unlock(&ctx->completion_lock); |
221c5eb2 | 5858 | |
8c838788 JA |
5859 | if (mask) { |
5860 | io_cqring_ev_posted(ctx); | |
5b7aa38d | 5861 | if (done) |
88e41cf9 | 5862 | io_put_req(req); |
221c5eb2 | 5863 | } |
8c838788 | 5864 | return ipt.error; |
221c5eb2 JA |
5865 | } |
5866 | ||
c5de0036 | 5867 | static int io_poll_update(struct io_kiocb *req, unsigned int issue_flags) |
b69de288 JA |
5868 | { |
5869 | struct io_ring_ctx *ctx = req->ctx; | |
5870 | struct io_kiocb *preq; | |
cb3b200e | 5871 | bool completing; |
b69de288 JA |
5872 | int ret; |
5873 | ||
79ebeaee | 5874 | spin_lock(&ctx->completion_lock); |
9ba5fac8 | 5875 | preq = io_poll_find(ctx, req->poll_update.old_user_data, true); |
b69de288 JA |
5876 | if (!preq) { |
5877 | ret = -ENOENT; | |
5878 | goto err; | |
b69de288 | 5879 | } |
cb3b200e | 5880 | |
c5de0036 PB |
5881 | if (!req->poll_update.update_events && !req->poll_update.update_user_data) { |
5882 | completing = true; | |
5883 | ret = io_poll_remove_one(preq) ? 0 : -EALREADY; | |
5884 | goto err; | |
5885 | } | |
5886 | ||
cb3b200e JA |
5887 | /* |
5888 | * Don't allow racy completion with singleshot, as we cannot safely | |
5889 | * update those. For multishot, if we're racing with completion, just | |
5890 | * let completion re-add it. | |
5891 | */ | |
5892 | completing = !__io_poll_remove_one(preq, &preq->poll, false); | |
5893 | if (completing && (preq->poll.events & EPOLLONESHOT)) { | |
5894 | ret = -EALREADY; | |
5895 | goto err; | |
b69de288 JA |
5896 | } |
5897 | /* we now have a detached poll request. reissue. */ | |
5898 | ret = 0; | |
5899 | err: | |
b69de288 | 5900 | if (ret < 0) { |
79ebeaee | 5901 | spin_unlock(&ctx->completion_lock); |
93d2bcd2 | 5902 | req_set_fail(req); |
b69de288 JA |
5903 | io_req_complete(req, ret); |
5904 | return 0; | |
5905 | } | |
5906 | /* only mask one event flags, keep behavior flags */ | |
9d805892 | 5907 | if (req->poll_update.update_events) { |
b69de288 | 5908 | preq->poll.events &= ~0xffff; |
9d805892 | 5909 | preq->poll.events |= req->poll_update.events & 0xffff; |
b69de288 JA |
5910 | preq->poll.events |= IO_POLL_UNMASK; |
5911 | } | |
9d805892 PB |
5912 | if (req->poll_update.update_user_data) |
5913 | preq->user_data = req->poll_update.new_user_data; | |
79ebeaee | 5914 | spin_unlock(&ctx->completion_lock); |
cb3b200e | 5915 | |
b69de288 JA |
5916 | /* complete update request, we're done with it */ |
5917 | io_req_complete(req, ret); | |
5918 | ||
cb3b200e | 5919 | if (!completing) { |
c5de0036 | 5920 | ret = io_poll_add(preq, issue_flags); |
cb3b200e | 5921 | if (ret < 0) { |
93d2bcd2 | 5922 | req_set_fail(preq); |
cb3b200e JA |
5923 | io_req_complete(preq, ret); |
5924 | } | |
b69de288 JA |
5925 | } |
5926 | return 0; | |
5927 | } | |
5928 | ||
f237c30a | 5929 | static void io_req_task_timeout(struct io_kiocb *req, bool *locked) |
89850fce | 5930 | { |
89850fce | 5931 | req_set_fail(req); |
505657bc | 5932 | io_req_complete_post(req, -ETIME, 0); |
89850fce JA |
5933 | } |
5934 | ||
5262f567 JA |
5935 | static enum hrtimer_restart io_timeout_fn(struct hrtimer *timer) |
5936 | { | |
ad8a48ac JA |
5937 | struct io_timeout_data *data = container_of(timer, |
5938 | struct io_timeout_data, timer); | |
5939 | struct io_kiocb *req = data->req; | |
5940 | struct io_ring_ctx *ctx = req->ctx; | |
5262f567 JA |
5941 | unsigned long flags; |
5942 | ||
89850fce | 5943 | spin_lock_irqsave(&ctx->timeout_lock, flags); |
a71976f3 | 5944 | list_del_init(&req->timeout.list); |
01cec8c1 PB |
5945 | atomic_set(&req->ctx->cq_timeouts, |
5946 | atomic_read(&req->ctx->cq_timeouts) + 1); | |
89850fce | 5947 | spin_unlock_irqrestore(&ctx->timeout_lock, flags); |
01cec8c1 | 5948 | |
89850fce JA |
5949 | req->io_task_work.func = io_req_task_timeout; |
5950 | io_req_task_work_add(req); | |
5262f567 JA |
5951 | return HRTIMER_NORESTART; |
5952 | } | |
5953 | ||
fbd15848 PB |
5954 | static struct io_kiocb *io_timeout_extract(struct io_ring_ctx *ctx, |
5955 | __u64 user_data) | |
89850fce | 5956 | __must_hold(&ctx->timeout_lock) |
f254ac04 | 5957 | { |
fbd15848 | 5958 | struct io_timeout_data *io; |
47f46768 | 5959 | struct io_kiocb *req; |
fd9c7bc5 | 5960 | bool found = false; |
f254ac04 | 5961 | |
135fcde8 | 5962 | list_for_each_entry(req, &ctx->timeout_list, timeout.list) { |
fd9c7bc5 PB |
5963 | found = user_data == req->user_data; |
5964 | if (found) | |
47f46768 | 5965 | break; |
47f46768 | 5966 | } |
fd9c7bc5 PB |
5967 | if (!found) |
5968 | return ERR_PTR(-ENOENT); | |
fbd15848 PB |
5969 | |
5970 | io = req->async_data; | |
fd9c7bc5 | 5971 | if (hrtimer_try_to_cancel(&io->timer) == -1) |
fbd15848 | 5972 | return ERR_PTR(-EALREADY); |
a71976f3 | 5973 | list_del_init(&req->timeout.list); |
fbd15848 PB |
5974 | return req; |
5975 | } | |
47f46768 | 5976 | |
fbd15848 | 5977 | static int io_timeout_cancel(struct io_ring_ctx *ctx, __u64 user_data) |
ec3c3d0f | 5978 | __must_hold(&ctx->completion_lock) |
89850fce | 5979 | __must_hold(&ctx->timeout_lock) |
fbd15848 PB |
5980 | { |
5981 | struct io_kiocb *req = io_timeout_extract(ctx, user_data); | |
5982 | ||
5983 | if (IS_ERR(req)) | |
5984 | return PTR_ERR(req); | |
f254ac04 | 5985 | |
93d2bcd2 | 5986 | req_set_fail(req); |
d4d19c19 | 5987 | io_cqring_fill_event(ctx, req->user_data, -ECANCELED, 0); |
91c2f697 | 5988 | io_put_req_deferred(req); |
f254ac04 JA |
5989 | return 0; |
5990 | } | |
5991 | ||
50c1df2b JA |
5992 | static clockid_t io_timeout_get_clock(struct io_timeout_data *data) |
5993 | { | |
5994 | switch (data->flags & IORING_TIMEOUT_CLOCK_MASK) { | |
5995 | case IORING_TIMEOUT_BOOTTIME: | |
5996 | return CLOCK_BOOTTIME; | |
5997 | case IORING_TIMEOUT_REALTIME: | |
5998 | return CLOCK_REALTIME; | |
5999 | default: | |
6000 | /* can't happen, vetted at prep time */ | |
6001 | WARN_ON_ONCE(1); | |
6002 | fallthrough; | |
6003 | case 0: | |
6004 | return CLOCK_MONOTONIC; | |
6005 | } | |
6006 | } | |
6007 | ||
f1042b6c PB |
6008 | static int io_linked_timeout_update(struct io_ring_ctx *ctx, __u64 user_data, |
6009 | struct timespec64 *ts, enum hrtimer_mode mode) | |
6010 | __must_hold(&ctx->timeout_lock) | |
6011 | { | |
6012 | struct io_timeout_data *io; | |
6013 | struct io_kiocb *req; | |
6014 | bool found = false; | |
6015 | ||
6016 | list_for_each_entry(req, &ctx->ltimeout_list, timeout.list) { | |
6017 | found = user_data == req->user_data; | |
6018 | if (found) | |
6019 | break; | |
6020 | } | |
6021 | if (!found) | |
6022 | return -ENOENT; | |
6023 | ||
6024 | io = req->async_data; | |
6025 | if (hrtimer_try_to_cancel(&io->timer) == -1) | |
6026 | return -EALREADY; | |
6027 | hrtimer_init(&io->timer, io_timeout_get_clock(io), mode); | |
6028 | io->timer.function = io_link_timeout_fn; | |
6029 | hrtimer_start(&io->timer, timespec64_to_ktime(*ts), mode); | |
6030 | return 0; | |
6031 | } | |
6032 | ||
9c8e11b3 PB |
6033 | static int io_timeout_update(struct io_ring_ctx *ctx, __u64 user_data, |
6034 | struct timespec64 *ts, enum hrtimer_mode mode) | |
89850fce | 6035 | __must_hold(&ctx->timeout_lock) |
47f46768 | 6036 | { |
9c8e11b3 PB |
6037 | struct io_kiocb *req = io_timeout_extract(ctx, user_data); |
6038 | struct io_timeout_data *data; | |
47f46768 | 6039 | |
9c8e11b3 PB |
6040 | if (IS_ERR(req)) |
6041 | return PTR_ERR(req); | |
47f46768 | 6042 | |
9c8e11b3 PB |
6043 | req->timeout.off = 0; /* noseq */ |
6044 | data = req->async_data; | |
6045 | list_add_tail(&req->timeout.list, &ctx->timeout_list); | |
50c1df2b | 6046 | hrtimer_init(&data->timer, io_timeout_get_clock(data), mode); |
9c8e11b3 PB |
6047 | data->timer.function = io_timeout_fn; |
6048 | hrtimer_start(&data->timer, timespec64_to_ktime(*ts), mode); | |
6049 | return 0; | |
47f46768 JA |
6050 | } |
6051 | ||
3529d8c2 JA |
6052 | static int io_timeout_remove_prep(struct io_kiocb *req, |
6053 | const struct io_uring_sqe *sqe) | |
b29472ee | 6054 | { |
9c8e11b3 PB |
6055 | struct io_timeout_rem *tr = &req->timeout_rem; |
6056 | ||
b29472ee JA |
6057 | if (unlikely(req->ctx->flags & IORING_SETUP_IOPOLL)) |
6058 | return -EINVAL; | |
61710e43 DA |
6059 | if (unlikely(req->flags & (REQ_F_FIXED_FILE | REQ_F_BUFFER_SELECT))) |
6060 | return -EINVAL; | |
26578cda | 6061 | if (sqe->ioprio || sqe->buf_index || sqe->len || sqe->splice_fd_in) |
b29472ee JA |
6062 | return -EINVAL; |
6063 | ||
f1042b6c | 6064 | tr->ltimeout = false; |
9c8e11b3 PB |
6065 | tr->addr = READ_ONCE(sqe->addr); |
6066 | tr->flags = READ_ONCE(sqe->timeout_flags); | |
f1042b6c PB |
6067 | if (tr->flags & IORING_TIMEOUT_UPDATE_MASK) { |
6068 | if (hweight32(tr->flags & IORING_TIMEOUT_CLOCK_MASK) > 1) | |
6069 | return -EINVAL; | |
6070 | if (tr->flags & IORING_LINK_TIMEOUT_UPDATE) | |
6071 | tr->ltimeout = true; | |
6072 | if (tr->flags & ~(IORING_TIMEOUT_UPDATE_MASK|IORING_TIMEOUT_ABS)) | |
9c8e11b3 PB |
6073 | return -EINVAL; |
6074 | if (get_timespec64(&tr->ts, u64_to_user_ptr(sqe->addr2))) | |
6075 | return -EFAULT; | |
6076 | } else if (tr->flags) { | |
6077 | /* timeout removal doesn't support flags */ | |
b29472ee | 6078 | return -EINVAL; |
9c8e11b3 | 6079 | } |
b29472ee | 6080 | |
b29472ee JA |
6081 | return 0; |
6082 | } | |
6083 | ||
8662daec PB |
6084 | static inline enum hrtimer_mode io_translate_timeout_mode(unsigned int flags) |
6085 | { | |
6086 | return (flags & IORING_TIMEOUT_ABS) ? HRTIMER_MODE_ABS | |
6087 | : HRTIMER_MODE_REL; | |
6088 | } | |
6089 | ||
11365043 JA |
6090 | /* |
6091 | * Remove or update an existing timeout command | |
6092 | */ | |
61e98203 | 6093 | static int io_timeout_remove(struct io_kiocb *req, unsigned int issue_flags) |
11365043 | 6094 | { |
9c8e11b3 | 6095 | struct io_timeout_rem *tr = &req->timeout_rem; |
11365043 | 6096 | struct io_ring_ctx *ctx = req->ctx; |
47f46768 | 6097 | int ret; |
11365043 | 6098 | |
ec3c3d0f PB |
6099 | if (!(req->timeout_rem.flags & IORING_TIMEOUT_UPDATE)) { |
6100 | spin_lock(&ctx->completion_lock); | |
6101 | spin_lock_irq(&ctx->timeout_lock); | |
9c8e11b3 | 6102 | ret = io_timeout_cancel(ctx, tr->addr); |
ec3c3d0f PB |
6103 | spin_unlock_irq(&ctx->timeout_lock); |
6104 | spin_unlock(&ctx->completion_lock); | |
6105 | } else { | |
f1042b6c PB |
6106 | enum hrtimer_mode mode = io_translate_timeout_mode(tr->flags); |
6107 | ||
ec3c3d0f | 6108 | spin_lock_irq(&ctx->timeout_lock); |
f1042b6c PB |
6109 | if (tr->ltimeout) |
6110 | ret = io_linked_timeout_update(ctx, tr->addr, &tr->ts, mode); | |
6111 | else | |
6112 | ret = io_timeout_update(ctx, tr->addr, &tr->ts, mode); | |
ec3c3d0f PB |
6113 | spin_unlock_irq(&ctx->timeout_lock); |
6114 | } | |
11365043 | 6115 | |
4e88d6e7 | 6116 | if (ret < 0) |
93d2bcd2 | 6117 | req_set_fail(req); |
505657bc | 6118 | io_req_complete_post(req, ret, 0); |
11365043 | 6119 | return 0; |
5262f567 JA |
6120 | } |
6121 | ||
3529d8c2 | 6122 | static int io_timeout_prep(struct io_kiocb *req, const struct io_uring_sqe *sqe, |
2d28390a | 6123 | bool is_timeout_link) |
5262f567 | 6124 | { |
ad8a48ac | 6125 | struct io_timeout_data *data; |
a41525ab | 6126 | unsigned flags; |
56080b02 | 6127 | u32 off = READ_ONCE(sqe->off); |
5262f567 | 6128 | |
ad8a48ac | 6129 | if (unlikely(req->ctx->flags & IORING_SETUP_IOPOLL)) |
5262f567 | 6130 | return -EINVAL; |
26578cda PB |
6131 | if (sqe->ioprio || sqe->buf_index || sqe->len != 1 || |
6132 | sqe->splice_fd_in) | |
a41525ab | 6133 | return -EINVAL; |
56080b02 | 6134 | if (off && is_timeout_link) |
2d28390a | 6135 | return -EINVAL; |
a41525ab | 6136 | flags = READ_ONCE(sqe->timeout_flags); |
50c1df2b JA |
6137 | if (flags & ~(IORING_TIMEOUT_ABS | IORING_TIMEOUT_CLOCK_MASK)) |
6138 | return -EINVAL; | |
6139 | /* more than one clock specified is invalid, obviously */ | |
6140 | if (hweight32(flags & IORING_TIMEOUT_CLOCK_MASK) > 1) | |
5262f567 | 6141 | return -EINVAL; |
bdf20073 | 6142 | |
ef9dd637 | 6143 | INIT_LIST_HEAD(&req->timeout.list); |
bfe68a22 | 6144 | req->timeout.off = off; |
f18ee4cf PB |
6145 | if (unlikely(off && !req->ctx->off_timeout_used)) |
6146 | req->ctx->off_timeout_used = true; | |
26a61679 | 6147 | |
e8c2bc1f | 6148 | if (!req->async_data && io_alloc_async_data(req)) |
26a61679 JA |
6149 | return -ENOMEM; |
6150 | ||
e8c2bc1f | 6151 | data = req->async_data; |
ad8a48ac | 6152 | data->req = req; |
50c1df2b | 6153 | data->flags = flags; |
ad8a48ac JA |
6154 | |
6155 | if (get_timespec64(&data->ts, u64_to_user_ptr(sqe->addr))) | |
5262f567 JA |
6156 | return -EFAULT; |
6157 | ||
8662daec | 6158 | data->mode = io_translate_timeout_mode(flags); |
50c1df2b | 6159 | hrtimer_init(&data->timer, io_timeout_get_clock(data), data->mode); |
b97e736a PB |
6160 | |
6161 | if (is_timeout_link) { | |
6162 | struct io_submit_link *link = &req->ctx->submit_state.link; | |
6163 | ||
6164 | if (!link->head) | |
6165 | return -EINVAL; | |
6166 | if (link->last->opcode == IORING_OP_LINK_TIMEOUT) | |
6167 | return -EINVAL; | |
4d13d1a4 PB |
6168 | req->timeout.head = link->last; |
6169 | link->last->flags |= REQ_F_ARM_LTIMEOUT; | |
b97e736a | 6170 | } |
ad8a48ac JA |
6171 | return 0; |
6172 | } | |
6173 | ||
61e98203 | 6174 | static int io_timeout(struct io_kiocb *req, unsigned int issue_flags) |
ad8a48ac | 6175 | { |
ad8a48ac | 6176 | struct io_ring_ctx *ctx = req->ctx; |
e8c2bc1f | 6177 | struct io_timeout_data *data = req->async_data; |
ad8a48ac | 6178 | struct list_head *entry; |
bfe68a22 | 6179 | u32 tail, off = req->timeout.off; |
ad8a48ac | 6180 | |
89850fce | 6181 | spin_lock_irq(&ctx->timeout_lock); |
93bd25bb | 6182 | |
5262f567 JA |
6183 | /* |
6184 | * sqe->off holds how many events that need to occur for this | |
93bd25bb JA |
6185 | * timeout event to be satisfied. If it isn't set, then this is |
6186 | * a pure timeout request, sequence isn't used. | |
5262f567 | 6187 | */ |
8eb7e2d0 | 6188 | if (io_is_timeout_noseq(req)) { |
93bd25bb JA |
6189 | entry = ctx->timeout_list.prev; |
6190 | goto add; | |
6191 | } | |
5262f567 | 6192 | |
bfe68a22 PB |
6193 | tail = ctx->cached_cq_tail - atomic_read(&ctx->cq_timeouts); |
6194 | req->timeout.target_seq = tail + off; | |
5262f567 | 6195 | |
f010505b MDG |
6196 | /* Update the last seq here in case io_flush_timeouts() hasn't. |
6197 | * This is safe because ->completion_lock is held, and submissions | |
6198 | * and completions are never mixed in the same ->completion_lock section. | |
6199 | */ | |
6200 | ctx->cq_last_tm_flush = tail; | |
6201 | ||
5262f567 JA |
6202 | /* |
6203 | * Insertion sort, ensuring the first entry in the list is always | |
6204 | * the one we need first. | |
6205 | */ | |
5262f567 | 6206 | list_for_each_prev(entry, &ctx->timeout_list) { |
135fcde8 PB |
6207 | struct io_kiocb *nxt = list_entry(entry, struct io_kiocb, |
6208 | timeout.list); | |
5262f567 | 6209 | |
8eb7e2d0 | 6210 | if (io_is_timeout_noseq(nxt)) |
93bd25bb | 6211 | continue; |
bfe68a22 PB |
6212 | /* nxt.seq is behind @tail, otherwise would've been completed */ |
6213 | if (off >= nxt->timeout.target_seq - tail) | |
5262f567 JA |
6214 | break; |
6215 | } | |
93bd25bb | 6216 | add: |
135fcde8 | 6217 | list_add(&req->timeout.list, entry); |
ad8a48ac JA |
6218 | data->timer.function = io_timeout_fn; |
6219 | hrtimer_start(&data->timer, timespec64_to_ktime(data->ts), data->mode); | |
89850fce | 6220 | spin_unlock_irq(&ctx->timeout_lock); |
5262f567 JA |
6221 | return 0; |
6222 | } | |
5262f567 | 6223 | |
f458dd84 PB |
6224 | struct io_cancel_data { |
6225 | struct io_ring_ctx *ctx; | |
6226 | u64 user_data; | |
6227 | }; | |
6228 | ||
62755e35 JA |
6229 | static bool io_cancel_cb(struct io_wq_work *work, void *data) |
6230 | { | |
6231 | struct io_kiocb *req = container_of(work, struct io_kiocb, work); | |
f458dd84 | 6232 | struct io_cancel_data *cd = data; |
62755e35 | 6233 | |
f458dd84 | 6234 | return req->ctx == cd->ctx && req->user_data == cd->user_data; |
62755e35 JA |
6235 | } |
6236 | ||
f458dd84 PB |
6237 | static int io_async_cancel_one(struct io_uring_task *tctx, u64 user_data, |
6238 | struct io_ring_ctx *ctx) | |
62755e35 | 6239 | { |
f458dd84 | 6240 | struct io_cancel_data data = { .ctx = ctx, .user_data = user_data, }; |
62755e35 | 6241 | enum io_wq_cancel cancel_ret; |
62755e35 JA |
6242 | int ret = 0; |
6243 | ||
f458dd84 | 6244 | if (!tctx || !tctx->io_wq) |
5aa75ed5 JA |
6245 | return -ENOENT; |
6246 | ||
f458dd84 | 6247 | cancel_ret = io_wq_cancel_cb(tctx->io_wq, io_cancel_cb, &data, false); |
62755e35 JA |
6248 | switch (cancel_ret) { |
6249 | case IO_WQ_CANCEL_OK: | |
6250 | ret = 0; | |
6251 | break; | |
6252 | case IO_WQ_CANCEL_RUNNING: | |
6253 | ret = -EALREADY; | |
6254 | break; | |
6255 | case IO_WQ_CANCEL_NOTFOUND: | |
6256 | ret = -ENOENT; | |
6257 | break; | |
6258 | } | |
6259 | ||
e977d6d3 JA |
6260 | return ret; |
6261 | } | |
6262 | ||
8cb01fac | 6263 | static int io_try_cancel_userdata(struct io_kiocb *req, u64 sqe_addr) |
47f46768 | 6264 | { |
8cb01fac | 6265 | struct io_ring_ctx *ctx = req->ctx; |
47f46768 JA |
6266 | int ret; |
6267 | ||
dadebc35 | 6268 | WARN_ON_ONCE(!io_wq_current_is_worker() && req->task != current); |
8cb01fac | 6269 | |
f458dd84 | 6270 | ret = io_async_cancel_one(req->task->io_uring, sqe_addr, ctx); |
df9727af | 6271 | if (ret != -ENOENT) |
8cb01fac | 6272 | return ret; |
505657bc PB |
6273 | |
6274 | spin_lock(&ctx->completion_lock); | |
79ebeaee | 6275 | spin_lock_irq(&ctx->timeout_lock); |
47f46768 | 6276 | ret = io_timeout_cancel(ctx, sqe_addr); |
79ebeaee | 6277 | spin_unlock_irq(&ctx->timeout_lock); |
47f46768 | 6278 | if (ret != -ENOENT) |
505657bc PB |
6279 | goto out; |
6280 | ret = io_poll_cancel(ctx, sqe_addr, false); | |
6281 | out: | |
6282 | spin_unlock(&ctx->completion_lock); | |
6283 | return ret; | |
47f46768 JA |
6284 | } |
6285 | ||
3529d8c2 JA |
6286 | static int io_async_cancel_prep(struct io_kiocb *req, |
6287 | const struct io_uring_sqe *sqe) | |
e977d6d3 | 6288 | { |
fbf23849 | 6289 | if (unlikely(req->ctx->flags & IORING_SETUP_IOPOLL)) |
e977d6d3 | 6290 | return -EINVAL; |
61710e43 DA |
6291 | if (unlikely(req->flags & (REQ_F_FIXED_FILE | REQ_F_BUFFER_SELECT))) |
6292 | return -EINVAL; | |
26578cda PB |
6293 | if (sqe->ioprio || sqe->off || sqe->len || sqe->cancel_flags || |
6294 | sqe->splice_fd_in) | |
e977d6d3 JA |
6295 | return -EINVAL; |
6296 | ||
fbf23849 JA |
6297 | req->cancel.addr = READ_ONCE(sqe->addr); |
6298 | return 0; | |
6299 | } | |
6300 | ||
61e98203 | 6301 | static int io_async_cancel(struct io_kiocb *req, unsigned int issue_flags) |
fbf23849 JA |
6302 | { |
6303 | struct io_ring_ctx *ctx = req->ctx; | |
58f99373 PB |
6304 | u64 sqe_addr = req->cancel.addr; |
6305 | struct io_tctx_node *node; | |
6306 | int ret; | |
6307 | ||
8cb01fac | 6308 | ret = io_try_cancel_userdata(req, sqe_addr); |
58f99373 PB |
6309 | if (ret != -ENOENT) |
6310 | goto done; | |
58f99373 PB |
6311 | |
6312 | /* slow path, try all io-wq's */ | |
6313 | io_ring_submit_lock(ctx, !(issue_flags & IO_URING_F_NONBLOCK)); | |
6314 | ret = -ENOENT; | |
6315 | list_for_each_entry(node, &ctx->tctx_list, ctx_node) { | |
6316 | struct io_uring_task *tctx = node->task->io_uring; | |
fbf23849 | 6317 | |
58f99373 PB |
6318 | ret = io_async_cancel_one(tctx, req->cancel.addr, ctx); |
6319 | if (ret != -ENOENT) | |
6320 | break; | |
6321 | } | |
6322 | io_ring_submit_unlock(ctx, !(issue_flags & IO_URING_F_NONBLOCK)); | |
58f99373 | 6323 | done: |
58f99373 | 6324 | if (ret < 0) |
93d2bcd2 | 6325 | req_set_fail(req); |
505657bc | 6326 | io_req_complete_post(req, ret, 0); |
5262f567 JA |
6327 | return 0; |
6328 | } | |
6329 | ||
269bbe5f | 6330 | static int io_rsrc_update_prep(struct io_kiocb *req, |
05f3fb3c JA |
6331 | const struct io_uring_sqe *sqe) |
6332 | { | |
61710e43 DA |
6333 | if (unlikely(req->flags & (REQ_F_FIXED_FILE | REQ_F_BUFFER_SELECT))) |
6334 | return -EINVAL; | |
26578cda | 6335 | if (sqe->ioprio || sqe->rw_flags || sqe->splice_fd_in) |
05f3fb3c JA |
6336 | return -EINVAL; |
6337 | ||
269bbe5f BM |
6338 | req->rsrc_update.offset = READ_ONCE(sqe->off); |
6339 | req->rsrc_update.nr_args = READ_ONCE(sqe->len); | |
6340 | if (!req->rsrc_update.nr_args) | |
05f3fb3c | 6341 | return -EINVAL; |
269bbe5f | 6342 | req->rsrc_update.arg = READ_ONCE(sqe->addr); |
05f3fb3c JA |
6343 | return 0; |
6344 | } | |
6345 | ||
889fca73 | 6346 | static int io_files_update(struct io_kiocb *req, unsigned int issue_flags) |
fbf23849 JA |
6347 | { |
6348 | struct io_ring_ctx *ctx = req->ctx; | |
c3bdad02 | 6349 | struct io_uring_rsrc_update2 up; |
05f3fb3c | 6350 | int ret; |
fbf23849 | 6351 | |
269bbe5f BM |
6352 | up.offset = req->rsrc_update.offset; |
6353 | up.data = req->rsrc_update.arg; | |
c3bdad02 PB |
6354 | up.nr = 0; |
6355 | up.tags = 0; | |
615cee49 | 6356 | up.resv = 0; |
05f3fb3c | 6357 | |
cdb31c29 | 6358 | io_ring_submit_lock(ctx, !(issue_flags & IO_URING_F_NONBLOCK)); |
fdecb662 | 6359 | ret = __io_register_rsrc_update(ctx, IORING_RSRC_FILE, |
98f0b3b4 | 6360 | &up, req->rsrc_update.nr_args); |
cdb31c29 | 6361 | io_ring_submit_unlock(ctx, !(issue_flags & IO_URING_F_NONBLOCK)); |
05f3fb3c JA |
6362 | |
6363 | if (ret < 0) | |
93d2bcd2 | 6364 | req_set_fail(req); |
889fca73 | 6365 | __io_req_complete(req, issue_flags, ret, 0); |
5262f567 JA |
6366 | return 0; |
6367 | } | |
6368 | ||
bfe76559 | 6369 | static int io_req_prep(struct io_kiocb *req, const struct io_uring_sqe *sqe) |
f67676d1 | 6370 | { |
d625c6ee | 6371 | switch (req->opcode) { |
e781573e | 6372 | case IORING_OP_NOP: |
bfe76559 | 6373 | return 0; |
f67676d1 JA |
6374 | case IORING_OP_READV: |
6375 | case IORING_OP_READ_FIXED: | |
3a6820f2 | 6376 | case IORING_OP_READ: |
bfe76559 | 6377 | return io_read_prep(req, sqe); |
f67676d1 JA |
6378 | case IORING_OP_WRITEV: |
6379 | case IORING_OP_WRITE_FIXED: | |
3a6820f2 | 6380 | case IORING_OP_WRITE: |
bfe76559 | 6381 | return io_write_prep(req, sqe); |
0969e783 | 6382 | case IORING_OP_POLL_ADD: |
bfe76559 | 6383 | return io_poll_add_prep(req, sqe); |
0969e783 | 6384 | case IORING_OP_POLL_REMOVE: |
c5de0036 | 6385 | return io_poll_update_prep(req, sqe); |
8ed8d3c3 | 6386 | case IORING_OP_FSYNC: |
1155c76a | 6387 | return io_fsync_prep(req, sqe); |
8ed8d3c3 | 6388 | case IORING_OP_SYNC_FILE_RANGE: |
1155c76a | 6389 | return io_sfr_prep(req, sqe); |
03b1230c | 6390 | case IORING_OP_SENDMSG: |
fddaface | 6391 | case IORING_OP_SEND: |
bfe76559 | 6392 | return io_sendmsg_prep(req, sqe); |
03b1230c | 6393 | case IORING_OP_RECVMSG: |
fddaface | 6394 | case IORING_OP_RECV: |
bfe76559 | 6395 | return io_recvmsg_prep(req, sqe); |
f499a021 | 6396 | case IORING_OP_CONNECT: |
bfe76559 | 6397 | return io_connect_prep(req, sqe); |
2d28390a | 6398 | case IORING_OP_TIMEOUT: |
bfe76559 | 6399 | return io_timeout_prep(req, sqe, false); |
b29472ee | 6400 | case IORING_OP_TIMEOUT_REMOVE: |
bfe76559 | 6401 | return io_timeout_remove_prep(req, sqe); |
fbf23849 | 6402 | case IORING_OP_ASYNC_CANCEL: |
bfe76559 | 6403 | return io_async_cancel_prep(req, sqe); |
2d28390a | 6404 | case IORING_OP_LINK_TIMEOUT: |
bfe76559 | 6405 | return io_timeout_prep(req, sqe, true); |
8ed8d3c3 | 6406 | case IORING_OP_ACCEPT: |
bfe76559 | 6407 | return io_accept_prep(req, sqe); |
d63d1b5e | 6408 | case IORING_OP_FALLOCATE: |
bfe76559 | 6409 | return io_fallocate_prep(req, sqe); |
15b71abe | 6410 | case IORING_OP_OPENAT: |
bfe76559 | 6411 | return io_openat_prep(req, sqe); |
b5dba59e | 6412 | case IORING_OP_CLOSE: |
bfe76559 | 6413 | return io_close_prep(req, sqe); |
05f3fb3c | 6414 | case IORING_OP_FILES_UPDATE: |
269bbe5f | 6415 | return io_rsrc_update_prep(req, sqe); |
eddc7ef5 | 6416 | case IORING_OP_STATX: |
bfe76559 | 6417 | return io_statx_prep(req, sqe); |
4840e418 | 6418 | case IORING_OP_FADVISE: |
bfe76559 | 6419 | return io_fadvise_prep(req, sqe); |
c1ca757b | 6420 | case IORING_OP_MADVISE: |
bfe76559 | 6421 | return io_madvise_prep(req, sqe); |
cebdb986 | 6422 | case IORING_OP_OPENAT2: |
bfe76559 | 6423 | return io_openat2_prep(req, sqe); |
3e4827b0 | 6424 | case IORING_OP_EPOLL_CTL: |
bfe76559 | 6425 | return io_epoll_ctl_prep(req, sqe); |
7d67af2c | 6426 | case IORING_OP_SPLICE: |
bfe76559 | 6427 | return io_splice_prep(req, sqe); |
ddf0322d | 6428 | case IORING_OP_PROVIDE_BUFFERS: |
bfe76559 | 6429 | return io_provide_buffers_prep(req, sqe); |
067524e9 | 6430 | case IORING_OP_REMOVE_BUFFERS: |
bfe76559 | 6431 | return io_remove_buffers_prep(req, sqe); |
f2a8d5c7 | 6432 | case IORING_OP_TEE: |
bfe76559 | 6433 | return io_tee_prep(req, sqe); |
36f4fa68 JA |
6434 | case IORING_OP_SHUTDOWN: |
6435 | return io_shutdown_prep(req, sqe); | |
80a261fd JA |
6436 | case IORING_OP_RENAMEAT: |
6437 | return io_renameat_prep(req, sqe); | |
14a1143b JA |
6438 | case IORING_OP_UNLINKAT: |
6439 | return io_unlinkat_prep(req, sqe); | |
e34a02dc DK |
6440 | case IORING_OP_MKDIRAT: |
6441 | return io_mkdirat_prep(req, sqe); | |
7a8721f8 DK |
6442 | case IORING_OP_SYMLINKAT: |
6443 | return io_symlinkat_prep(req, sqe); | |
cf30da90 DK |
6444 | case IORING_OP_LINKAT: |
6445 | return io_linkat_prep(req, sqe); | |
f67676d1 JA |
6446 | } |
6447 | ||
bfe76559 PB |
6448 | printk_once(KERN_WARNING "io_uring: unhandled opcode %d\n", |
6449 | req->opcode); | |
bd54b6fe | 6450 | return -EINVAL; |
bfe76559 PB |
6451 | } |
6452 | ||
93642ef8 | 6453 | static int io_req_prep_async(struct io_kiocb *req) |
bfe76559 | 6454 | { |
b7e298d2 PB |
6455 | if (!io_op_defs[req->opcode].needs_async_setup) |
6456 | return 0; | |
6457 | if (WARN_ON_ONCE(req->async_data)) | |
6458 | return -EFAULT; | |
6459 | if (io_alloc_async_data(req)) | |
6460 | return -EAGAIN; | |
6461 | ||
93642ef8 PB |
6462 | switch (req->opcode) { |
6463 | case IORING_OP_READV: | |
93642ef8 PB |
6464 | return io_rw_prep_async(req, READ); |
6465 | case IORING_OP_WRITEV: | |
93642ef8 PB |
6466 | return io_rw_prep_async(req, WRITE); |
6467 | case IORING_OP_SENDMSG: | |
93642ef8 PB |
6468 | return io_sendmsg_prep_async(req); |
6469 | case IORING_OP_RECVMSG: | |
93642ef8 PB |
6470 | return io_recvmsg_prep_async(req); |
6471 | case IORING_OP_CONNECT: | |
6472 | return io_connect_prep_async(req); | |
6473 | } | |
b7e298d2 PB |
6474 | printk_once(KERN_WARNING "io_uring: prep_async() bad opcode %d\n", |
6475 | req->opcode); | |
6476 | return -EFAULT; | |
f67676d1 JA |
6477 | } |
6478 | ||
9cf7c104 PB |
6479 | static u32 io_get_sequence(struct io_kiocb *req) |
6480 | { | |
a3dbdf54 | 6481 | u32 seq = req->ctx->cached_sq_head; |
9cf7c104 | 6482 | |
a3dbdf54 PB |
6483 | /* need original cached_sq_head, but it was increased for each req */ |
6484 | io_for_each_link(req, req) | |
6485 | seq--; | |
6486 | return seq; | |
9cf7c104 PB |
6487 | } |
6488 | ||
76cc33d7 | 6489 | static bool io_drain_req(struct io_kiocb *req) |
de0617e4 | 6490 | { |
3c19966d | 6491 | struct io_kiocb *pos; |
a197f664 | 6492 | struct io_ring_ctx *ctx = req->ctx; |
27dc8338 | 6493 | struct io_defer_entry *de; |
f67676d1 | 6494 | int ret; |
9cf7c104 | 6495 | u32 seq; |
de0617e4 | 6496 | |
b8ce1b9d PB |
6497 | if (req->flags & REQ_F_FAIL) { |
6498 | io_req_complete_fail_submit(req); | |
6499 | return true; | |
6500 | } | |
6501 | ||
3c19966d PB |
6502 | /* |
6503 | * If we need to drain a request in the middle of a link, drain the | |
6504 | * head request and the next request/link after the current link. | |
6505 | * Considering sequential execution of links, IOSQE_IO_DRAIN will be | |
6506 | * maintained for every request of our link. | |
6507 | */ | |
6508 | if (ctx->drain_next) { | |
6509 | req->flags |= REQ_F_IO_DRAIN; | |
6510 | ctx->drain_next = false; | |
6511 | } | |
6512 | /* not interested in head, start from the first linked */ | |
6513 | io_for_each_link(pos, req->link) { | |
6514 | if (pos->flags & REQ_F_IO_DRAIN) { | |
6515 | ctx->drain_next = true; | |
6516 | req->flags |= REQ_F_IO_DRAIN; | |
6517 | break; | |
6518 | } | |
6519 | } | |
6520 | ||
9d858b21 | 6521 | /* Still need defer if there is pending req in defer list. */ |
9cf7c104 | 6522 | if (likely(list_empty_careful(&ctx->defer_list) && |
10c66904 PB |
6523 | !(req->flags & REQ_F_IO_DRAIN))) { |
6524 | ctx->drain_active = false; | |
76cc33d7 | 6525 | return false; |
10c66904 | 6526 | } |
9cf7c104 PB |
6527 | |
6528 | seq = io_get_sequence(req); | |
6529 | /* Still a chance to pass the sequence check */ | |
6530 | if (!req_need_defer(req, seq) && list_empty_careful(&ctx->defer_list)) | |
76cc33d7 | 6531 | return false; |
de0617e4 | 6532 | |
b7e298d2 | 6533 | ret = io_req_prep_async(req); |
be7053b7 | 6534 | if (ret) |
1b48773f | 6535 | goto fail; |
cbdcb435 | 6536 | io_prep_async_link(req); |
27dc8338 | 6537 | de = kmalloc(sizeof(*de), GFP_KERNEL); |
76cc33d7 | 6538 | if (!de) { |
1b48773f PB |
6539 | ret = -ENOMEM; |
6540 | fail: | |
6541 | io_req_complete_failed(req, ret); | |
76cc33d7 PB |
6542 | return true; |
6543 | } | |
2d28390a | 6544 | |
79ebeaee | 6545 | spin_lock(&ctx->completion_lock); |
9cf7c104 | 6546 | if (!req_need_defer(req, seq) && list_empty(&ctx->defer_list)) { |
79ebeaee | 6547 | spin_unlock(&ctx->completion_lock); |
27dc8338 | 6548 | kfree(de); |
f237c30a | 6549 | io_queue_async_work(req, NULL); |
76cc33d7 | 6550 | return true; |
de0617e4 JA |
6551 | } |
6552 | ||
915967f6 | 6553 | trace_io_uring_defer(ctx, req, req->user_data); |
27dc8338 | 6554 | de->req = req; |
9cf7c104 | 6555 | de->seq = seq; |
27dc8338 | 6556 | list_add_tail(&de->list, &ctx->defer_list); |
79ebeaee | 6557 | spin_unlock(&ctx->completion_lock); |
76cc33d7 | 6558 | return true; |
de0617e4 JA |
6559 | } |
6560 | ||
68fb8979 | 6561 | static void io_clean_op(struct io_kiocb *req) |
99bc4c38 | 6562 | { |
0e1b6fe3 PB |
6563 | if (req->flags & REQ_F_BUFFER_SELECTED) { |
6564 | switch (req->opcode) { | |
6565 | case IORING_OP_READV: | |
6566 | case IORING_OP_READ_FIXED: | |
6567 | case IORING_OP_READ: | |
bcda7baa | 6568 | kfree((void *)(unsigned long)req->rw.addr); |
0e1b6fe3 PB |
6569 | break; |
6570 | case IORING_OP_RECVMSG: | |
6571 | case IORING_OP_RECV: | |
bcda7baa | 6572 | kfree(req->sr_msg.kbuf); |
0e1b6fe3 PB |
6573 | break; |
6574 | } | |
99bc4c38 PB |
6575 | } |
6576 | ||
0e1b6fe3 PB |
6577 | if (req->flags & REQ_F_NEED_CLEANUP) { |
6578 | switch (req->opcode) { | |
6579 | case IORING_OP_READV: | |
6580 | case IORING_OP_READ_FIXED: | |
6581 | case IORING_OP_READ: | |
6582 | case IORING_OP_WRITEV: | |
6583 | case IORING_OP_WRITE_FIXED: | |
e8c2bc1f JA |
6584 | case IORING_OP_WRITE: { |
6585 | struct io_async_rw *io = req->async_data; | |
1dacb4df PB |
6586 | |
6587 | kfree(io->free_iovec); | |
0e1b6fe3 | 6588 | break; |
e8c2bc1f | 6589 | } |
0e1b6fe3 | 6590 | case IORING_OP_RECVMSG: |
e8c2bc1f JA |
6591 | case IORING_OP_SENDMSG: { |
6592 | struct io_async_msghdr *io = req->async_data; | |
257e84a5 PB |
6593 | |
6594 | kfree(io->free_iov); | |
0e1b6fe3 | 6595 | break; |
e8c2bc1f | 6596 | } |
0e1b6fe3 PB |
6597 | case IORING_OP_SPLICE: |
6598 | case IORING_OP_TEE: | |
e1d767f0 PB |
6599 | if (!(req->splice.flags & SPLICE_F_FD_IN_FIXED)) |
6600 | io_put_file(req->splice.file_in); | |
0e1b6fe3 | 6601 | break; |
f3cd4850 JA |
6602 | case IORING_OP_OPENAT: |
6603 | case IORING_OP_OPENAT2: | |
6604 | if (req->open.filename) | |
6605 | putname(req->open.filename); | |
6606 | break; | |
80a261fd JA |
6607 | case IORING_OP_RENAMEAT: |
6608 | putname(req->rename.oldpath); | |
6609 | putname(req->rename.newpath); | |
6610 | break; | |
14a1143b JA |
6611 | case IORING_OP_UNLINKAT: |
6612 | putname(req->unlink.filename); | |
6613 | break; | |
e34a02dc DK |
6614 | case IORING_OP_MKDIRAT: |
6615 | putname(req->mkdir.filename); | |
6616 | break; | |
7a8721f8 DK |
6617 | case IORING_OP_SYMLINKAT: |
6618 | putname(req->symlink.oldpath); | |
6619 | putname(req->symlink.newpath); | |
6620 | break; | |
cf30da90 DK |
6621 | case IORING_OP_LINKAT: |
6622 | putname(req->hardlink.oldpath); | |
6623 | putname(req->hardlink.newpath); | |
6624 | break; | |
0e1b6fe3 | 6625 | } |
99bc4c38 | 6626 | } |
75652a30 JA |
6627 | if ((req->flags & REQ_F_POLLED) && req->apoll) { |
6628 | kfree(req->apoll->double_poll); | |
6629 | kfree(req->apoll); | |
6630 | req->apoll = NULL; | |
6631 | } | |
3a0a6902 PB |
6632 | if (req->flags & REQ_F_INFLIGHT) { |
6633 | struct io_uring_task *tctx = req->task->io_uring; | |
6634 | ||
6635 | atomic_dec(&tctx->inflight_tracked); | |
3a0a6902 | 6636 | } |
c854357b | 6637 | if (req->flags & REQ_F_CREDS) |
b8e64b53 | 6638 | put_cred(req->creds); |
c854357b PB |
6639 | |
6640 | req->flags &= ~IO_REQ_CLEAN_FLAGS; | |
99bc4c38 PB |
6641 | } |
6642 | ||
889fca73 | 6643 | static int io_issue_sqe(struct io_kiocb *req, unsigned int issue_flags) |
2b188cc1 | 6644 | { |
a197f664 | 6645 | struct io_ring_ctx *ctx = req->ctx; |
5730b27e | 6646 | const struct cred *creds = NULL; |
d625c6ee | 6647 | int ret; |
2b188cc1 | 6648 | |
b8e64b53 | 6649 | if ((req->flags & REQ_F_CREDS) && req->creds != current_cred()) |
c10d1f98 | 6650 | creds = override_creds(req->creds); |
5730b27e | 6651 | |
d625c6ee | 6652 | switch (req->opcode) { |
2b188cc1 | 6653 | case IORING_OP_NOP: |
889fca73 | 6654 | ret = io_nop(req, issue_flags); |
2b188cc1 JA |
6655 | break; |
6656 | case IORING_OP_READV: | |
edafccee | 6657 | case IORING_OP_READ_FIXED: |
3a6820f2 | 6658 | case IORING_OP_READ: |
889fca73 | 6659 | ret = io_read(req, issue_flags); |
edafccee | 6660 | break; |
3529d8c2 | 6661 | case IORING_OP_WRITEV: |
edafccee | 6662 | case IORING_OP_WRITE_FIXED: |
3a6820f2 | 6663 | case IORING_OP_WRITE: |
889fca73 | 6664 | ret = io_write(req, issue_flags); |
2b188cc1 | 6665 | break; |
c992fe29 | 6666 | case IORING_OP_FSYNC: |
45d189c6 | 6667 | ret = io_fsync(req, issue_flags); |
c992fe29 | 6668 | break; |
221c5eb2 | 6669 | case IORING_OP_POLL_ADD: |
61e98203 | 6670 | ret = io_poll_add(req, issue_flags); |
221c5eb2 JA |
6671 | break; |
6672 | case IORING_OP_POLL_REMOVE: | |
c5de0036 | 6673 | ret = io_poll_update(req, issue_flags); |
221c5eb2 | 6674 | break; |
5d17b4a4 | 6675 | case IORING_OP_SYNC_FILE_RANGE: |
45d189c6 | 6676 | ret = io_sync_file_range(req, issue_flags); |
5d17b4a4 | 6677 | break; |
0fa03c62 | 6678 | case IORING_OP_SENDMSG: |
889fca73 | 6679 | ret = io_sendmsg(req, issue_flags); |
062d04d7 | 6680 | break; |
fddaface | 6681 | case IORING_OP_SEND: |
889fca73 | 6682 | ret = io_send(req, issue_flags); |
0fa03c62 | 6683 | break; |
aa1fa28f | 6684 | case IORING_OP_RECVMSG: |
889fca73 | 6685 | ret = io_recvmsg(req, issue_flags); |
062d04d7 | 6686 | break; |
fddaface | 6687 | case IORING_OP_RECV: |
889fca73 | 6688 | ret = io_recv(req, issue_flags); |
aa1fa28f | 6689 | break; |
5262f567 | 6690 | case IORING_OP_TIMEOUT: |
61e98203 | 6691 | ret = io_timeout(req, issue_flags); |
5262f567 | 6692 | break; |
11365043 | 6693 | case IORING_OP_TIMEOUT_REMOVE: |
61e98203 | 6694 | ret = io_timeout_remove(req, issue_flags); |
11365043 | 6695 | break; |
17f2fe35 | 6696 | case IORING_OP_ACCEPT: |
889fca73 | 6697 | ret = io_accept(req, issue_flags); |
17f2fe35 | 6698 | break; |
f8e85cf2 | 6699 | case IORING_OP_CONNECT: |
889fca73 | 6700 | ret = io_connect(req, issue_flags); |
f8e85cf2 | 6701 | break; |
62755e35 | 6702 | case IORING_OP_ASYNC_CANCEL: |
61e98203 | 6703 | ret = io_async_cancel(req, issue_flags); |
62755e35 | 6704 | break; |
d63d1b5e | 6705 | case IORING_OP_FALLOCATE: |
45d189c6 | 6706 | ret = io_fallocate(req, issue_flags); |
d63d1b5e | 6707 | break; |
15b71abe | 6708 | case IORING_OP_OPENAT: |
45d189c6 | 6709 | ret = io_openat(req, issue_flags); |
15b71abe | 6710 | break; |
b5dba59e | 6711 | case IORING_OP_CLOSE: |
889fca73 | 6712 | ret = io_close(req, issue_flags); |
b5dba59e | 6713 | break; |
05f3fb3c | 6714 | case IORING_OP_FILES_UPDATE: |
889fca73 | 6715 | ret = io_files_update(req, issue_flags); |
05f3fb3c | 6716 | break; |
eddc7ef5 | 6717 | case IORING_OP_STATX: |
45d189c6 | 6718 | ret = io_statx(req, issue_flags); |
eddc7ef5 | 6719 | break; |
4840e418 | 6720 | case IORING_OP_FADVISE: |
45d189c6 | 6721 | ret = io_fadvise(req, issue_flags); |
4840e418 | 6722 | break; |
c1ca757b | 6723 | case IORING_OP_MADVISE: |
45d189c6 | 6724 | ret = io_madvise(req, issue_flags); |
c1ca757b | 6725 | break; |
cebdb986 | 6726 | case IORING_OP_OPENAT2: |
45d189c6 | 6727 | ret = io_openat2(req, issue_flags); |
cebdb986 | 6728 | break; |
3e4827b0 | 6729 | case IORING_OP_EPOLL_CTL: |
889fca73 | 6730 | ret = io_epoll_ctl(req, issue_flags); |
3e4827b0 | 6731 | break; |
7d67af2c | 6732 | case IORING_OP_SPLICE: |
45d189c6 | 6733 | ret = io_splice(req, issue_flags); |
7d67af2c | 6734 | break; |
ddf0322d | 6735 | case IORING_OP_PROVIDE_BUFFERS: |
889fca73 | 6736 | ret = io_provide_buffers(req, issue_flags); |
ddf0322d | 6737 | break; |
067524e9 | 6738 | case IORING_OP_REMOVE_BUFFERS: |
889fca73 | 6739 | ret = io_remove_buffers(req, issue_flags); |
3e4827b0 | 6740 | break; |
f2a8d5c7 | 6741 | case IORING_OP_TEE: |
45d189c6 | 6742 | ret = io_tee(req, issue_flags); |
f2a8d5c7 | 6743 | break; |
36f4fa68 | 6744 | case IORING_OP_SHUTDOWN: |
45d189c6 | 6745 | ret = io_shutdown(req, issue_flags); |
36f4fa68 | 6746 | break; |
80a261fd | 6747 | case IORING_OP_RENAMEAT: |
45d189c6 | 6748 | ret = io_renameat(req, issue_flags); |
80a261fd | 6749 | break; |
14a1143b | 6750 | case IORING_OP_UNLINKAT: |
45d189c6 | 6751 | ret = io_unlinkat(req, issue_flags); |
14a1143b | 6752 | break; |
e34a02dc DK |
6753 | case IORING_OP_MKDIRAT: |
6754 | ret = io_mkdirat(req, issue_flags); | |
6755 | break; | |
7a8721f8 DK |
6756 | case IORING_OP_SYMLINKAT: |
6757 | ret = io_symlinkat(req, issue_flags); | |
6758 | break; | |
cf30da90 DK |
6759 | case IORING_OP_LINKAT: |
6760 | ret = io_linkat(req, issue_flags); | |
6761 | break; | |
2b188cc1 JA |
6762 | default: |
6763 | ret = -EINVAL; | |
6764 | break; | |
6765 | } | |
6766 | ||
5730b27e JA |
6767 | if (creds) |
6768 | revert_creds(creds); | |
def596e9 JA |
6769 | if (ret) |
6770 | return ret; | |
b532576e | 6771 | /* If the op doesn't have a file, we're not polling for it */ |
cb3d8972 PB |
6772 | if ((ctx->flags & IORING_SETUP_IOPOLL) && req->file) |
6773 | io_iopoll_req_issued(req); | |
def596e9 JA |
6774 | |
6775 | return 0; | |
2b188cc1 JA |
6776 | } |
6777 | ||
ebc11b6c PB |
6778 | static struct io_wq_work *io_wq_free_work(struct io_wq_work *work) |
6779 | { | |
6780 | struct io_kiocb *req = container_of(work, struct io_kiocb, work); | |
6781 | ||
6782 | req = io_put_req_find_next(req); | |
6783 | return req ? &req->work : NULL; | |
6784 | } | |
6785 | ||
5280f7e5 | 6786 | static void io_wq_submit_work(struct io_wq_work *work) |
2b188cc1 JA |
6787 | { |
6788 | struct io_kiocb *req = container_of(work, struct io_kiocb, work); | |
6df1db6b | 6789 | struct io_kiocb *timeout; |
561fb04a | 6790 | int ret = 0; |
2b188cc1 | 6791 | |
48dcd38d PB |
6792 | /* one will be dropped by ->io_free_work() after returning to io-wq */ |
6793 | if (!(req->flags & REQ_F_REFCOUNT)) | |
6794 | __io_req_set_refcount(req, 2); | |
6795 | else | |
6796 | req_ref_get(req); | |
5d5901a3 | 6797 | |
6df1db6b PB |
6798 | timeout = io_prep_linked_timeout(req); |
6799 | if (timeout) | |
6800 | io_queue_linked_timeout(timeout); | |
d4c81f38 | 6801 | |
dadebc35 | 6802 | /* either cancelled or io-wq is dying, so don't touch tctx->iowq */ |
4014d943 | 6803 | if (work->flags & IO_WQ_WORK_CANCEL) |
561fb04a | 6804 | ret = -ECANCELED; |
31b51510 | 6805 | |
561fb04a | 6806 | if (!ret) { |
561fb04a | 6807 | do { |
889fca73 | 6808 | ret = io_issue_sqe(req, 0); |
561fb04a JA |
6809 | /* |
6810 | * We can get EAGAIN for polled IO even though we're | |
6811 | * forcing a sync submission from here, since we can't | |
6812 | * wait for request slots on the block side. | |
6813 | */ | |
6814 | if (ret != -EAGAIN) | |
6815 | break; | |
6816 | cond_resched(); | |
6817 | } while (1); | |
6818 | } | |
31b51510 | 6819 | |
a3df7698 | 6820 | /* avoid locking problems by failing it from a clean context */ |
5d5901a3 | 6821 | if (ret) |
a3df7698 | 6822 | io_req_task_queue_fail(req, ret); |
2b188cc1 JA |
6823 | } |
6824 | ||
aeca241b | 6825 | static inline struct io_fixed_file *io_fixed_file_slot(struct io_file_table *table, |
042b0d85 | 6826 | unsigned i) |
65e19f54 | 6827 | { |
042b0d85 | 6828 | return &table->files[i]; |
dafecf19 PB |
6829 | } |
6830 | ||
65e19f54 JA |
6831 | static inline struct file *io_file_from_index(struct io_ring_ctx *ctx, |
6832 | int index) | |
6833 | { | |
aeca241b | 6834 | struct io_fixed_file *slot = io_fixed_file_slot(&ctx->file_table, index); |
65e19f54 | 6835 | |
a04b0ac0 | 6836 | return (struct file *) (slot->file_ptr & FFS_MASK); |
65e19f54 JA |
6837 | } |
6838 | ||
a04b0ac0 | 6839 | static void io_fixed_file_set(struct io_fixed_file *file_slot, struct file *file) |
9a321c98 PB |
6840 | { |
6841 | unsigned long file_ptr = (unsigned long) file; | |
6842 | ||
b191e2df | 6843 | if (__io_file_supports_nowait(file, READ)) |
9a321c98 | 6844 | file_ptr |= FFS_ASYNC_READ; |
b191e2df | 6845 | if (__io_file_supports_nowait(file, WRITE)) |
9a321c98 PB |
6846 | file_ptr |= FFS_ASYNC_WRITE; |
6847 | if (S_ISREG(file_inode(file)->i_mode)) | |
6848 | file_ptr |= FFS_ISREG; | |
a04b0ac0 | 6849 | file_slot->file_ptr = file_ptr; |
65e19f54 JA |
6850 | } |
6851 | ||
ac177053 PB |
6852 | static inline struct file *io_file_get_fixed(struct io_ring_ctx *ctx, |
6853 | struct io_kiocb *req, int fd) | |
09bb8394 | 6854 | { |
8da11c19 | 6855 | struct file *file; |
ac177053 | 6856 | unsigned long file_ptr; |
09bb8394 | 6857 | |
ac177053 PB |
6858 | if (unlikely((unsigned int)fd >= ctx->nr_user_files)) |
6859 | return NULL; | |
6860 | fd = array_index_nospec(fd, ctx->nr_user_files); | |
6861 | file_ptr = io_fixed_file_slot(&ctx->file_table, fd)->file_ptr; | |
6862 | file = (struct file *) (file_ptr & FFS_MASK); | |
6863 | file_ptr &= ~FFS_MASK; | |
6864 | /* mask in overlapping REQ_F and FFS bits */ | |
b191e2df | 6865 | req->flags |= (file_ptr << REQ_F_NOWAIT_READ_BIT); |
ac177053 PB |
6866 | io_req_set_rsrc_node(req); |
6867 | return file; | |
6868 | } | |
d44f554e | 6869 | |
ac177053 | 6870 | static struct file *io_file_get_normal(struct io_ring_ctx *ctx, |
ac177053 PB |
6871 | struct io_kiocb *req, int fd) |
6872 | { | |
62906e89 | 6873 | struct file *file = fget(fd); |
ac177053 PB |
6874 | |
6875 | trace_io_uring_file_get(ctx, fd); | |
09bb8394 | 6876 | |
ac177053 PB |
6877 | /* we don't allow fixed io_uring files */ |
6878 | if (file && unlikely(file->f_op == &io_uring_fops)) | |
6879 | io_req_track_inflight(req); | |
8371adf5 | 6880 | return file; |
09bb8394 JA |
6881 | } |
6882 | ||
ac177053 | 6883 | static inline struct file *io_file_get(struct io_ring_ctx *ctx, |
ac177053 PB |
6884 | struct io_kiocb *req, int fd, bool fixed) |
6885 | { | |
6886 | if (fixed) | |
6887 | return io_file_get_fixed(ctx, req, fd); | |
6888 | else | |
62906e89 | 6889 | return io_file_get_normal(ctx, req, fd); |
ac177053 PB |
6890 | } |
6891 | ||
f237c30a | 6892 | static void io_req_task_link_timeout(struct io_kiocb *req, bool *locked) |
89b263f6 JA |
6893 | { |
6894 | struct io_kiocb *prev = req->timeout.prev; | |
8cb01fac | 6895 | int ret; |
89b263f6 JA |
6896 | |
6897 | if (prev) { | |
8cb01fac | 6898 | ret = io_try_cancel_userdata(req, prev->user_data); |
505657bc | 6899 | io_req_complete_post(req, ret ?: -ETIME, 0); |
89b263f6 | 6900 | io_put_req(prev); |
89b263f6 JA |
6901 | } else { |
6902 | io_req_complete_post(req, -ETIME, 0); | |
6903 | } | |
6904 | } | |
6905 | ||
2665abfd | 6906 | static enum hrtimer_restart io_link_timeout_fn(struct hrtimer *timer) |
2b188cc1 | 6907 | { |
ad8a48ac JA |
6908 | struct io_timeout_data *data = container_of(timer, |
6909 | struct io_timeout_data, timer); | |
90cd7e42 | 6910 | struct io_kiocb *prev, *req = data->req; |
2665abfd | 6911 | struct io_ring_ctx *ctx = req->ctx; |
2665abfd | 6912 | unsigned long flags; |
2665abfd | 6913 | |
89b263f6 | 6914 | spin_lock_irqsave(&ctx->timeout_lock, flags); |
90cd7e42 PB |
6915 | prev = req->timeout.head; |
6916 | req->timeout.head = NULL; | |
2665abfd JA |
6917 | |
6918 | /* | |
6919 | * We don't expect the list to be empty, that will only happen if we | |
6920 | * race with the completion of the linked work. | |
6921 | */ | |
447c19f3 | 6922 | if (prev) { |
f2f87370 | 6923 | io_remove_next_linked(prev); |
447c19f3 PB |
6924 | if (!req_ref_inc_not_zero(prev)) |
6925 | prev = NULL; | |
6926 | } | |
ef9dd637 | 6927 | list_del(&req->timeout.list); |
89b263f6 JA |
6928 | req->timeout.prev = prev; |
6929 | spin_unlock_irqrestore(&ctx->timeout_lock, flags); | |
2665abfd | 6930 | |
89b263f6 JA |
6931 | req->io_task_work.func = io_req_task_link_timeout; |
6932 | io_req_task_work_add(req); | |
2665abfd JA |
6933 | return HRTIMER_NORESTART; |
6934 | } | |
6935 | ||
de968c18 | 6936 | static void io_queue_linked_timeout(struct io_kiocb *req) |
2665abfd | 6937 | { |
de968c18 PB |
6938 | struct io_ring_ctx *ctx = req->ctx; |
6939 | ||
89b263f6 | 6940 | spin_lock_irq(&ctx->timeout_lock); |
76a46e06 | 6941 | /* |
f2f87370 PB |
6942 | * If the back reference is NULL, then our linked request finished |
6943 | * before we got a chance to setup the timer | |
76a46e06 | 6944 | */ |
90cd7e42 | 6945 | if (req->timeout.head) { |
e8c2bc1f | 6946 | struct io_timeout_data *data = req->async_data; |
94ae5e77 | 6947 | |
ad8a48ac JA |
6948 | data->timer.function = io_link_timeout_fn; |
6949 | hrtimer_start(&data->timer, timespec64_to_ktime(data->ts), | |
6950 | data->mode); | |
ef9dd637 | 6951 | list_add_tail(&req->timeout.list, &ctx->ltimeout_list); |
2665abfd | 6952 | } |
89b263f6 | 6953 | spin_unlock_irq(&ctx->timeout_lock); |
2665abfd | 6954 | /* drop submission reference */ |
76a46e06 JA |
6955 | io_put_req(req); |
6956 | } | |
2665abfd | 6957 | |
c5eef2b9 | 6958 | static void __io_queue_sqe(struct io_kiocb *req) |
282cdc86 | 6959 | __must_hold(&req->ctx->uring_lock) |
2b188cc1 | 6960 | { |
906c6caa | 6961 | struct io_kiocb *linked_timeout; |
e0c5c576 | 6962 | int ret; |
2b188cc1 | 6963 | |
59b735ae | 6964 | issue_sqe: |
c5eef2b9 | 6965 | ret = io_issue_sqe(req, IO_URING_F_NONBLOCK|IO_URING_F_COMPLETE_DEFER); |
193155c8 | 6966 | |
491381ce JA |
6967 | /* |
6968 | * We async punt it if the file wasn't marked NOWAIT, or if the file | |
6969 | * doesn't support non-blocking read/write attempts | |
6970 | */ | |
1840038e | 6971 | if (likely(!ret)) { |
e342c807 | 6972 | if (req->flags & REQ_F_COMPLETE_INLINE) { |
c5eef2b9 | 6973 | struct io_ring_ctx *ctx = req->ctx; |
cd0ca2e0 | 6974 | struct io_submit_state *state = &ctx->submit_state; |
e65ef56d | 6975 | |
cd0ca2e0 PB |
6976 | state->compl_reqs[state->compl_nr++] = req; |
6977 | if (state->compl_nr == ARRAY_SIZE(state->compl_reqs)) | |
2a2758f2 | 6978 | io_submit_flush_completions(ctx); |
906c6caa | 6979 | return; |
0d63c148 | 6980 | } |
906c6caa PB |
6981 | |
6982 | linked_timeout = io_prep_linked_timeout(req); | |
6983 | if (linked_timeout) | |
6984 | io_queue_linked_timeout(linked_timeout); | |
1840038e | 6985 | } else if (ret == -EAGAIN && !(req->flags & REQ_F_NOWAIT)) { |
906c6caa PB |
6986 | linked_timeout = io_prep_linked_timeout(req); |
6987 | ||
59b735ae OL |
6988 | switch (io_arm_poll_handler(req)) { |
6989 | case IO_APOLL_READY: | |
906c6caa PB |
6990 | if (linked_timeout) |
6991 | io_unprep_linked_timeout(req); | |
59b735ae OL |
6992 | goto issue_sqe; |
6993 | case IO_APOLL_ABORTED: | |
1840038e PB |
6994 | /* |
6995 | * Queued up for async execution, worker will release | |
6996 | * submit reference when the iocb is actually submitted. | |
6997 | */ | |
f237c30a | 6998 | io_queue_async_work(req, NULL); |
59b735ae | 6999 | break; |
1840038e | 7000 | } |
906c6caa PB |
7001 | |
7002 | if (linked_timeout) | |
7003 | io_queue_linked_timeout(linked_timeout); | |
0d63c148 | 7004 | } else { |
f41db273 | 7005 | io_req_complete_failed(req, ret); |
9e645e11 | 7006 | } |
2b188cc1 JA |
7007 | } |
7008 | ||
441b8a78 | 7009 | static inline void io_queue_sqe(struct io_kiocb *req) |
282cdc86 | 7010 | __must_hold(&req->ctx->uring_lock) |
4fe2c963 | 7011 | { |
10c66904 | 7012 | if (unlikely(req->ctx->drain_active) && io_drain_req(req)) |
76cc33d7 | 7013 | return; |
4fe2c963 | 7014 | |
a8295b98 | 7015 | if (likely(!(req->flags & (REQ_F_FORCE_ASYNC | REQ_F_FAIL)))) { |
c5eef2b9 | 7016 | __io_queue_sqe(req); |
a8295b98 | 7017 | } else if (req->flags & REQ_F_FAIL) { |
c6d3d9cb | 7018 | io_req_complete_fail_submit(req); |
76cc33d7 PB |
7019 | } else { |
7020 | int ret = io_req_prep_async(req); | |
7021 | ||
7022 | if (unlikely(ret)) | |
7023 | io_req_complete_failed(req, ret); | |
7024 | else | |
f237c30a | 7025 | io_queue_async_work(req, NULL); |
ce35a47a | 7026 | } |
4fe2c963 JL |
7027 | } |
7028 | ||
b16fed66 PB |
7029 | /* |
7030 | * Check SQE restrictions (opcode and flags). | |
7031 | * | |
7032 | * Returns 'true' if SQE is allowed, 'false' otherwise. | |
7033 | */ | |
7034 | static inline bool io_check_restriction(struct io_ring_ctx *ctx, | |
7035 | struct io_kiocb *req, | |
7036 | unsigned int sqe_flags) | |
4fe2c963 | 7037 | { |
4cfb25bf | 7038 | if (likely(!ctx->restricted)) |
b16fed66 PB |
7039 | return true; |
7040 | ||
7041 | if (!test_bit(req->opcode, ctx->restrictions.sqe_op)) | |
7042 | return false; | |
7043 | ||
7044 | if ((sqe_flags & ctx->restrictions.sqe_flags_required) != | |
7045 | ctx->restrictions.sqe_flags_required) | |
7046 | return false; | |
7047 | ||
7048 | if (sqe_flags & ~(ctx->restrictions.sqe_flags_allowed | | |
7049 | ctx->restrictions.sqe_flags_required)) | |
7050 | return false; | |
7051 | ||
7052 | return true; | |
4fe2c963 JL |
7053 | } |
7054 | ||
b16fed66 PB |
7055 | static int io_init_req(struct io_ring_ctx *ctx, struct io_kiocb *req, |
7056 | const struct io_uring_sqe *sqe) | |
282cdc86 | 7057 | __must_hold(&ctx->uring_lock) |
b16fed66 PB |
7058 | { |
7059 | struct io_submit_state *state; | |
7060 | unsigned int sqe_flags; | |
003e8dcc | 7061 | int personality, ret = 0; |
b16fed66 | 7062 | |
864ea921 | 7063 | /* req is partially pre-initialised, see io_preinit_req() */ |
b16fed66 PB |
7064 | req->opcode = READ_ONCE(sqe->opcode); |
7065 | /* same numerical values with corresponding REQ_F_*, safe to copy */ | |
7066 | req->flags = sqe_flags = READ_ONCE(sqe->flags); | |
7067 | req->user_data = READ_ONCE(sqe->user_data); | |
b16fed66 | 7068 | req->file = NULL; |
b16fed66 | 7069 | req->fixed_rsrc_refs = NULL; |
b16fed66 | 7070 | req->task = current; |
b16fed66 PB |
7071 | |
7072 | /* enforce forwards compatibility on users */ | |
dddca226 | 7073 | if (unlikely(sqe_flags & ~SQE_VALID_FLAGS)) |
b16fed66 | 7074 | return -EINVAL; |
b16fed66 PB |
7075 | if (unlikely(req->opcode >= IORING_OP_LAST)) |
7076 | return -EINVAL; | |
4cfb25bf | 7077 | if (!io_check_restriction(ctx, req, sqe_flags)) |
b16fed66 PB |
7078 | return -EACCES; |
7079 | ||
7080 | if ((sqe_flags & IOSQE_BUFFER_SELECT) && | |
7081 | !io_op_defs[req->opcode].buffer_select) | |
7082 | return -EOPNOTSUPP; | |
3c19966d PB |
7083 | if (unlikely(sqe_flags & IOSQE_IO_DRAIN)) |
7084 | ctx->drain_active = true; | |
863e0560 | 7085 | |
003e8dcc JA |
7086 | personality = READ_ONCE(sqe->personality); |
7087 | if (personality) { | |
c10d1f98 PB |
7088 | req->creds = xa_load(&ctx->personalities, personality); |
7089 | if (!req->creds) | |
003e8dcc | 7090 | return -EINVAL; |
c10d1f98 | 7091 | get_cred(req->creds); |
b8e64b53 | 7092 | req->flags |= REQ_F_CREDS; |
003e8dcc | 7093 | } |
b16fed66 PB |
7094 | state = &ctx->submit_state; |
7095 | ||
7096 | /* | |
7097 | * Plug now if we have more than 1 IO left after this, and the target | |
7098 | * is potentially a read/write to block based storage. | |
7099 | */ | |
7100 | if (!state->plug_started && state->ios_left > 1 && | |
7101 | io_op_defs[req->opcode].plug) { | |
7102 | blk_start_plug(&state->plug); | |
7103 | state->plug_started = true; | |
7104 | } | |
7105 | ||
7106 | if (io_op_defs[req->opcode].needs_file) { | |
62906e89 | 7107 | req->file = io_file_get(ctx, req, READ_ONCE(sqe->fd), |
ac177053 | 7108 | (sqe_flags & IOSQE_FIXED_FILE)); |
b16fed66 PB |
7109 | if (unlikely(!req->file)) |
7110 | ret = -EBADF; | |
7111 | } | |
7112 | ||
7113 | state->ios_left--; | |
7114 | return ret; | |
7115 | } | |
7116 | ||
a6b8cadc | 7117 | static int io_submit_sqe(struct io_ring_ctx *ctx, struct io_kiocb *req, |
a1ab7b35 | 7118 | const struct io_uring_sqe *sqe) |
282cdc86 | 7119 | __must_hold(&ctx->uring_lock) |
9e645e11 | 7120 | { |
a1ab7b35 | 7121 | struct io_submit_link *link = &ctx->submit_state.link; |
ef4ff581 | 7122 | int ret; |
9e645e11 | 7123 | |
a6b8cadc PB |
7124 | ret = io_init_req(ctx, req, sqe); |
7125 | if (unlikely(ret)) { | |
7126 | fail_req: | |
a8295b98 | 7127 | /* fail even hard links since we don't submit */ |
de59bc10 | 7128 | if (link->head) { |
a8295b98 HX |
7129 | /* |
7130 | * we can judge a link req is failed or cancelled by if | |
7131 | * REQ_F_FAIL is set, but the head is an exception since | |
7132 | * it may be set REQ_F_FAIL because of other req's failure | |
7133 | * so let's leverage req->result to distinguish if a head | |
7134 | * is set REQ_F_FAIL because of its failure or other req's | |
7135 | * failure so that we can set the correct ret code for it. | |
7136 | * init result here to avoid affecting the normal path. | |
7137 | */ | |
7138 | if (!(link->head->flags & REQ_F_FAIL)) | |
7139 | req_fail_link_node(link->head, -ECANCELED); | |
7140 | } else if (!(req->flags & (REQ_F_LINK | REQ_F_HARDLINK))) { | |
7141 | /* | |
7142 | * the current req is a normal req, we should return | |
7143 | * error and thus break the submittion loop. | |
7144 | */ | |
7145 | io_req_complete_failed(req, ret); | |
7146 | return ret; | |
de59bc10 | 7147 | } |
a8295b98 HX |
7148 | req_fail_link_node(req, ret); |
7149 | } else { | |
7150 | ret = io_req_prep(req, sqe); | |
7151 | if (unlikely(ret)) | |
7152 | goto fail_req; | |
a6b8cadc | 7153 | } |
441b8a78 | 7154 | |
be7053b7 | 7155 | /* don't need @sqe from now on */ |
236daeae OL |
7156 | trace_io_uring_submit_sqe(ctx, req, req->opcode, req->user_data, |
7157 | req->flags, true, | |
7158 | ctx->flags & IORING_SETUP_SQPOLL); | |
a6b8cadc | 7159 | |
9e645e11 JA |
7160 | /* |
7161 | * If we already have a head request, queue this one for async | |
7162 | * submittal once the head completes. If we don't have a head but | |
7163 | * IOSQE_IO_LINK is set in the sqe, start a new head. This one will be | |
7164 | * submitted sync once the chain is complete. If none of those | |
7165 | * conditions are true (normal request), then just queue it. | |
7166 | */ | |
863e0560 PB |
7167 | if (link->head) { |
7168 | struct io_kiocb *head = link->head; | |
4e88d6e7 | 7169 | |
a8295b98 HX |
7170 | if (!(req->flags & REQ_F_FAIL)) { |
7171 | ret = io_req_prep_async(req); | |
7172 | if (unlikely(ret)) { | |
7173 | req_fail_link_node(req, ret); | |
7174 | if (!(head->flags & REQ_F_FAIL)) | |
7175 | req_fail_link_node(head, -ECANCELED); | |
7176 | } | |
7177 | } | |
9d76377f | 7178 | trace_io_uring_link(ctx, req, head); |
f2f87370 | 7179 | link->last->link = req; |
863e0560 | 7180 | link->last = req; |
32fe525b PB |
7181 | |
7182 | /* last request of a link, enqueue the link */ | |
ef4ff581 | 7183 | if (!(req->flags & (REQ_F_LINK | REQ_F_HARDLINK))) { |
863e0560 | 7184 | link->head = NULL; |
5e159204 | 7185 | io_queue_sqe(head); |
32fe525b | 7186 | } |
9e645e11 | 7187 | } else { |
ef4ff581 | 7188 | if (req->flags & (REQ_F_LINK | REQ_F_HARDLINK)) { |
863e0560 PB |
7189 | link->head = req; |
7190 | link->last = req; | |
711be031 | 7191 | } else { |
be7053b7 | 7192 | io_queue_sqe(req); |
711be031 | 7193 | } |
9e645e11 | 7194 | } |
2e6e1fde | 7195 | |
1d4240cc | 7196 | return 0; |
9e645e11 JA |
7197 | } |
7198 | ||
9a56a232 JA |
7199 | /* |
7200 | * Batched submission is done, ensure local IO is flushed out. | |
7201 | */ | |
ba88ff11 PB |
7202 | static void io_submit_state_end(struct io_submit_state *state, |
7203 | struct io_ring_ctx *ctx) | |
9a56a232 | 7204 | { |
a1ab7b35 | 7205 | if (state->link.head) |
de59bc10 | 7206 | io_queue_sqe(state->link.head); |
cd0ca2e0 | 7207 | if (state->compl_nr) |
2a2758f2 | 7208 | io_submit_flush_completions(ctx); |
27926b68 JA |
7209 | if (state->plug_started) |
7210 | blk_finish_plug(&state->plug); | |
9a56a232 JA |
7211 | } |
7212 | ||
7213 | /* | |
7214 | * Start submission side cache. | |
7215 | */ | |
7216 | static void io_submit_state_start(struct io_submit_state *state, | |
ba88ff11 | 7217 | unsigned int max_ios) |
9a56a232 | 7218 | { |
27926b68 | 7219 | state->plug_started = false; |
9a56a232 | 7220 | state->ios_left = max_ios; |
a1ab7b35 PB |
7221 | /* set only head, no need to init link_last in advance */ |
7222 | state->link.head = NULL; | |
9a56a232 JA |
7223 | } |
7224 | ||
2b188cc1 JA |
7225 | static void io_commit_sqring(struct io_ring_ctx *ctx) |
7226 | { | |
75b28aff | 7227 | struct io_rings *rings = ctx->rings; |
2b188cc1 | 7228 | |
caf582c6 PB |
7229 | /* |
7230 | * Ensure any loads from the SQEs are done at this point, | |
7231 | * since once we write the new head, the application could | |
7232 | * write new data to them. | |
7233 | */ | |
7234 | smp_store_release(&rings->sq.head, ctx->cached_sq_head); | |
2b188cc1 JA |
7235 | } |
7236 | ||
2b188cc1 | 7237 | /* |
dd9ae8a0 | 7238 | * Fetch an sqe, if one is available. Note this returns a pointer to memory |
2b188cc1 JA |
7239 | * that is mapped by userspace. This means that care needs to be taken to |
7240 | * ensure that reads are stable, as we cannot rely on userspace always | |
7241 | * being a good citizen. If members of the sqe are validated and then later | |
7242 | * used, it's important that those reads are done through READ_ONCE() to | |
7243 | * prevent a re-load down the line. | |
7244 | */ | |
709b302f | 7245 | static const struct io_uring_sqe *io_get_sqe(struct io_ring_ctx *ctx) |
2b188cc1 | 7246 | { |
ea5ab3b5 | 7247 | unsigned head, mask = ctx->sq_entries - 1; |
17d3aeb3 | 7248 | unsigned sq_idx = ctx->cached_sq_head++ & mask; |
2b188cc1 JA |
7249 | |
7250 | /* | |
7251 | * The cached sq head (or cq tail) serves two purposes: | |
7252 | * | |
7253 | * 1) allows us to batch the cost of updating the user visible | |
7254 | * head updates. | |
7255 | * 2) allows the kernel side to track the head on its own, even | |
7256 | * though the application is the one updating it. | |
7257 | */ | |
17d3aeb3 | 7258 | head = READ_ONCE(ctx->sq_array[sq_idx]); |
709b302f PB |
7259 | if (likely(head < ctx->sq_entries)) |
7260 | return &ctx->sq_sqes[head]; | |
2b188cc1 JA |
7261 | |
7262 | /* drop invalid entries */ | |
15641e42 PB |
7263 | ctx->cq_extra--; |
7264 | WRITE_ONCE(ctx->rings->sq_dropped, | |
7265 | READ_ONCE(ctx->rings->sq_dropped) + 1); | |
709b302f PB |
7266 | return NULL; |
7267 | } | |
7268 | ||
0f212204 | 7269 | static int io_submit_sqes(struct io_ring_ctx *ctx, unsigned int nr) |
282cdc86 | 7270 | __must_hold(&ctx->uring_lock) |
6c271ce2 | 7271 | { |
46c4e16a | 7272 | int submitted = 0; |
6c271ce2 | 7273 | |
ee7d46d9 PB |
7274 | /* make sure SQ entry isn't read before tail */ |
7275 | nr = min3(nr, ctx->sq_entries, io_sqring_entries(ctx)); | |
2b85edfc PB |
7276 | if (!percpu_ref_tryget_many(&ctx->refs, nr)) |
7277 | return -EAGAIN; | |
9a10867a | 7278 | io_get_task_refs(nr); |
6c271ce2 | 7279 | |
ba88ff11 | 7280 | io_submit_state_start(&ctx->submit_state, nr); |
46c4e16a | 7281 | while (submitted < nr) { |
3529d8c2 | 7282 | const struct io_uring_sqe *sqe; |
196be95c | 7283 | struct io_kiocb *req; |
fb5ccc98 | 7284 | |
258b29a9 | 7285 | req = io_alloc_req(ctx); |
196be95c PB |
7286 | if (unlikely(!req)) { |
7287 | if (!submitted) | |
7288 | submitted = -EAGAIN; | |
fb5ccc98 | 7289 | break; |
196be95c | 7290 | } |
4fccfcbb PB |
7291 | sqe = io_get_sqe(ctx); |
7292 | if (unlikely(!sqe)) { | |
0c6e1d7f | 7293 | list_add(&req->inflight_entry, &ctx->submit_state.free_list); |
4fccfcbb PB |
7294 | break; |
7295 | } | |
d3656344 JA |
7296 | /* will complete beyond this point, count as submitted */ |
7297 | submitted++; | |
a1ab7b35 | 7298 | if (io_submit_sqe(ctx, req, sqe)) |
196be95c | 7299 | break; |
6c271ce2 JA |
7300 | } |
7301 | ||
9466f437 PB |
7302 | if (unlikely(submitted != nr)) { |
7303 | int ref_used = (submitted == -EAGAIN) ? 0 : submitted; | |
d8a6df10 | 7304 | int unused = nr - ref_used; |
9466f437 | 7305 | |
09899b19 | 7306 | current->io_uring->cached_refs += unused; |
d8a6df10 | 7307 | percpu_ref_put_many(&ctx->refs, unused); |
9466f437 | 7308 | } |
6c271ce2 | 7309 | |
a1ab7b35 | 7310 | io_submit_state_end(&ctx->submit_state, ctx); |
ae9428ca PB |
7311 | /* Commit SQ ring head once we've consumed and submitted all SQEs */ |
7312 | io_commit_sqring(ctx); | |
7313 | ||
6c271ce2 JA |
7314 | return submitted; |
7315 | } | |
7316 | ||
e4b6d902 PB |
7317 | static inline bool io_sqd_events_pending(struct io_sq_data *sqd) |
7318 | { | |
7319 | return READ_ONCE(sqd->state); | |
7320 | } | |
7321 | ||
23b3628e XW |
7322 | static inline void io_ring_set_wakeup_flag(struct io_ring_ctx *ctx) |
7323 | { | |
7324 | /* Tell userspace we may need a wakeup call */ | |
79ebeaee | 7325 | spin_lock(&ctx->completion_lock); |
20c0b380 NA |
7326 | WRITE_ONCE(ctx->rings->sq_flags, |
7327 | ctx->rings->sq_flags | IORING_SQ_NEED_WAKEUP); | |
79ebeaee | 7328 | spin_unlock(&ctx->completion_lock); |
23b3628e XW |
7329 | } |
7330 | ||
7331 | static inline void io_ring_clear_wakeup_flag(struct io_ring_ctx *ctx) | |
7332 | { | |
79ebeaee | 7333 | spin_lock(&ctx->completion_lock); |
20c0b380 NA |
7334 | WRITE_ONCE(ctx->rings->sq_flags, |
7335 | ctx->rings->sq_flags & ~IORING_SQ_NEED_WAKEUP); | |
79ebeaee | 7336 | spin_unlock(&ctx->completion_lock); |
23b3628e XW |
7337 | } |
7338 | ||
08369246 | 7339 | static int __io_sq_thread(struct io_ring_ctx *ctx, bool cap_entries) |
6c271ce2 | 7340 | { |
c8d1ba58 | 7341 | unsigned int to_submit; |
bdcd3eab | 7342 | int ret = 0; |
6c271ce2 | 7343 | |
c8d1ba58 | 7344 | to_submit = io_sqring_entries(ctx); |
e95eee2d | 7345 | /* if we're handling multiple rings, cap submit size for fairness */ |
4ce8ad95 OL |
7346 | if (cap_entries && to_submit > IORING_SQPOLL_CAP_ENTRIES_VALUE) |
7347 | to_submit = IORING_SQPOLL_CAP_ENTRIES_VALUE; | |
e95eee2d | 7348 | |
906a3c6f | 7349 | if (!list_empty(&ctx->iopoll_list) || to_submit) { |
c8d1ba58 | 7350 | unsigned nr_events = 0; |
948e1947 PB |
7351 | const struct cred *creds = NULL; |
7352 | ||
7353 | if (ctx->sq_creds != current_cred()) | |
7354 | creds = override_creds(ctx->sq_creds); | |
a4c0b3de | 7355 | |
c8d1ba58 | 7356 | mutex_lock(&ctx->uring_lock); |
906a3c6f | 7357 | if (!list_empty(&ctx->iopoll_list)) |
a8576af9 | 7358 | io_do_iopoll(ctx, &nr_events, 0); |
906a3c6f | 7359 | |
3b763ba1 PB |
7360 | /* |
7361 | * Don't submit if refs are dying, good for io_uring_register(), | |
7362 | * but also it is relied upon by io_ring_exit_work() | |
7363 | */ | |
0298ef96 PB |
7364 | if (to_submit && likely(!percpu_ref_is_dying(&ctx->refs)) && |
7365 | !(ctx->flags & IORING_SETUP_R_DISABLED)) | |
08369246 | 7366 | ret = io_submit_sqes(ctx, to_submit); |
c8d1ba58 | 7367 | mutex_unlock(&ctx->uring_lock); |
6c271ce2 | 7368 | |
acfb381d PB |
7369 | if (to_submit && wq_has_sleeper(&ctx->sqo_sq_wait)) |
7370 | wake_up(&ctx->sqo_sq_wait); | |
948e1947 PB |
7371 | if (creds) |
7372 | revert_creds(creds); | |
acfb381d | 7373 | } |
6c271ce2 | 7374 | |
08369246 XW |
7375 | return ret; |
7376 | } | |
6c271ce2 | 7377 | |
08369246 XW |
7378 | static void io_sqd_update_thread_idle(struct io_sq_data *sqd) |
7379 | { | |
7380 | struct io_ring_ctx *ctx; | |
7381 | unsigned sq_thread_idle = 0; | |
6c271ce2 | 7382 | |
c9dca27d PB |
7383 | list_for_each_entry(ctx, &sqd->ctx_list, sqd_list) |
7384 | sq_thread_idle = max(sq_thread_idle, ctx->sq_thread_idle); | |
08369246 | 7385 | sqd->sq_thread_idle = sq_thread_idle; |
c8d1ba58 | 7386 | } |
6c271ce2 | 7387 | |
e4b6d902 PB |
7388 | static bool io_sqd_handle_event(struct io_sq_data *sqd) |
7389 | { | |
7390 | bool did_sig = false; | |
7391 | struct ksignal ksig; | |
7392 | ||
7393 | if (test_bit(IO_SQ_THREAD_SHOULD_PARK, &sqd->state) || | |
7394 | signal_pending(current)) { | |
7395 | mutex_unlock(&sqd->lock); | |
7396 | if (signal_pending(current)) | |
7397 | did_sig = get_signal(&ksig); | |
7398 | cond_resched(); | |
7399 | mutex_lock(&sqd->lock); | |
7400 | } | |
e4b6d902 PB |
7401 | return did_sig || test_bit(IO_SQ_THREAD_SHOULD_STOP, &sqd->state); |
7402 | } | |
7403 | ||
c8d1ba58 JA |
7404 | static int io_sq_thread(void *data) |
7405 | { | |
69fb2131 JA |
7406 | struct io_sq_data *sqd = data; |
7407 | struct io_ring_ctx *ctx; | |
a0d9205f | 7408 | unsigned long timeout = 0; |
37d1e2e3 | 7409 | char buf[TASK_COMM_LEN]; |
08369246 | 7410 | DEFINE_WAIT(wait); |
6c271ce2 | 7411 | |
696ee88a | 7412 | snprintf(buf, sizeof(buf), "iou-sqp-%d", sqd->task_pid); |
37d1e2e3 | 7413 | set_task_comm(current, buf); |
37d1e2e3 JA |
7414 | |
7415 | if (sqd->sq_cpu != -1) | |
7416 | set_cpus_allowed_ptr(current, cpumask_of(sqd->sq_cpu)); | |
7417 | else | |
7418 | set_cpus_allowed_ptr(current, cpu_online_mask); | |
7419 | current->flags |= PF_NO_SETAFFINITY; | |
7420 | ||
09a6f4ef | 7421 | mutex_lock(&sqd->lock); |
e4b6d902 | 7422 | while (1) { |
1a924a80 | 7423 | bool cap_entries, sqt_spin = false; |
c1edbf5f | 7424 | |
e4b6d902 PB |
7425 | if (io_sqd_events_pending(sqd) || signal_pending(current)) { |
7426 | if (io_sqd_handle_event(sqd)) | |
c7d95613 | 7427 | break; |
08369246 XW |
7428 | timeout = jiffies + sqd->sq_thread_idle; |
7429 | } | |
e4b6d902 | 7430 | |
e95eee2d | 7431 | cap_entries = !list_is_singular(&sqd->ctx_list); |
69fb2131 | 7432 | list_for_each_entry(ctx, &sqd->ctx_list, sqd_list) { |
948e1947 | 7433 | int ret = __io_sq_thread(ctx, cap_entries); |
7c30f36a | 7434 | |
08369246 XW |
7435 | if (!sqt_spin && (ret > 0 || !list_empty(&ctx->iopoll_list))) |
7436 | sqt_spin = true; | |
69fb2131 | 7437 | } |
dd432ea5 PB |
7438 | if (io_run_task_work()) |
7439 | sqt_spin = true; | |
6c271ce2 | 7440 | |
08369246 | 7441 | if (sqt_spin || !time_after(jiffies, timeout)) { |
c8d1ba58 | 7442 | cond_resched(); |
08369246 XW |
7443 | if (sqt_spin) |
7444 | timeout = jiffies + sqd->sq_thread_idle; | |
7445 | continue; | |
7446 | } | |
7447 | ||
08369246 | 7448 | prepare_to_wait(&sqd->wait, &wait, TASK_INTERRUPTIBLE); |
dd432ea5 | 7449 | if (!io_sqd_events_pending(sqd) && !current->task_works) { |
1a924a80 PB |
7450 | bool needs_sched = true; |
7451 | ||
724cb4f9 | 7452 | list_for_each_entry(ctx, &sqd->ctx_list, sqd_list) { |
aaa9f0f4 PB |
7453 | io_ring_set_wakeup_flag(ctx); |
7454 | ||
724cb4f9 HX |
7455 | if ((ctx->flags & IORING_SETUP_IOPOLL) && |
7456 | !list_empty_careful(&ctx->iopoll_list)) { | |
7457 | needs_sched = false; | |
7458 | break; | |
7459 | } | |
7460 | if (io_sqring_entries(ctx)) { | |
7461 | needs_sched = false; | |
7462 | break; | |
7463 | } | |
7464 | } | |
7465 | ||
7466 | if (needs_sched) { | |
7467 | mutex_unlock(&sqd->lock); | |
7468 | schedule(); | |
7469 | mutex_lock(&sqd->lock); | |
7470 | } | |
69fb2131 JA |
7471 | list_for_each_entry(ctx, &sqd->ctx_list, sqd_list) |
7472 | io_ring_clear_wakeup_flag(ctx); | |
6c271ce2 | 7473 | } |
08369246 XW |
7474 | |
7475 | finish_wait(&sqd->wait, &wait); | |
7476 | timeout = jiffies + sqd->sq_thread_idle; | |
6c271ce2 | 7477 | } |
28cea78a | 7478 | |
78cc687b | 7479 | io_uring_cancel_generic(true, sqd); |
37d1e2e3 | 7480 | sqd->thread = NULL; |
05962f95 | 7481 | list_for_each_entry(ctx, &sqd->ctx_list, sqd_list) |
5f3f26f9 | 7482 | io_ring_set_wakeup_flag(ctx); |
521d6a73 | 7483 | io_run_task_work(); |
734551df PB |
7484 | mutex_unlock(&sqd->lock); |
7485 | ||
37d1e2e3 JA |
7486 | complete(&sqd->exited); |
7487 | do_exit(0); | |
6c271ce2 JA |
7488 | } |
7489 | ||
bda52162 JA |
7490 | struct io_wait_queue { |
7491 | struct wait_queue_entry wq; | |
7492 | struct io_ring_ctx *ctx; | |
5fd46178 | 7493 | unsigned cq_tail; |
bda52162 JA |
7494 | unsigned nr_timeouts; |
7495 | }; | |
7496 | ||
6c503150 | 7497 | static inline bool io_should_wake(struct io_wait_queue *iowq) |
bda52162 JA |
7498 | { |
7499 | struct io_ring_ctx *ctx = iowq->ctx; | |
5fd46178 | 7500 | int dist = ctx->cached_cq_tail - (int) iowq->cq_tail; |
bda52162 JA |
7501 | |
7502 | /* | |
d195a66e | 7503 | * Wake up if we have enough events, or if a timeout occurred since we |
bda52162 JA |
7504 | * started waiting. For timeouts, we always want to return to userspace, |
7505 | * regardless of event count. | |
7506 | */ | |
5fd46178 | 7507 | return dist >= 0 || atomic_read(&ctx->cq_timeouts) != iowq->nr_timeouts; |
bda52162 JA |
7508 | } |
7509 | ||
7510 | static int io_wake_function(struct wait_queue_entry *curr, unsigned int mode, | |
7511 | int wake_flags, void *key) | |
7512 | { | |
7513 | struct io_wait_queue *iowq = container_of(curr, struct io_wait_queue, | |
7514 | wq); | |
7515 | ||
6c503150 PB |
7516 | /* |
7517 | * Cannot safely flush overflowed CQEs from here, ensure we wake up | |
7518 | * the task, and the next invocation will do it. | |
7519 | */ | |
5ed7a37d | 7520 | if (io_should_wake(iowq) || test_bit(0, &iowq->ctx->check_cq_overflow)) |
6c503150 PB |
7521 | return autoremove_wake_function(curr, mode, wake_flags, key); |
7522 | return -1; | |
bda52162 JA |
7523 | } |
7524 | ||
af9c1a44 JA |
7525 | static int io_run_task_work_sig(void) |
7526 | { | |
7527 | if (io_run_task_work()) | |
7528 | return 1; | |
7529 | if (!signal_pending(current)) | |
7530 | return 0; | |
0b8cfa97 | 7531 | if (test_thread_flag(TIF_NOTIFY_SIGNAL)) |
792ee0f6 | 7532 | return -ERESTARTSYS; |
af9c1a44 JA |
7533 | return -EINTR; |
7534 | } | |
7535 | ||
eeb60b9a PB |
7536 | /* when returns >0, the caller should retry */ |
7537 | static inline int io_cqring_wait_schedule(struct io_ring_ctx *ctx, | |
7538 | struct io_wait_queue *iowq, | |
7539 | signed long *timeout) | |
7540 | { | |
7541 | int ret; | |
7542 | ||
7543 | /* make sure we run task_work before checking for signals */ | |
7544 | ret = io_run_task_work_sig(); | |
7545 | if (ret || io_should_wake(iowq)) | |
7546 | return ret; | |
7547 | /* let the caller flush overflows, retry */ | |
5ed7a37d | 7548 | if (test_bit(0, &ctx->check_cq_overflow)) |
eeb60b9a PB |
7549 | return 1; |
7550 | ||
7551 | *timeout = schedule_timeout(*timeout); | |
7552 | return !*timeout ? -ETIME : 1; | |
7553 | } | |
7554 | ||
2b188cc1 JA |
7555 | /* |
7556 | * Wait until events become available, if we don't already have some. The | |
7557 | * application must reap them itself, as they reside on the shared cq ring. | |
7558 | */ | |
7559 | static int io_cqring_wait(struct io_ring_ctx *ctx, int min_events, | |
c73ebb68 HX |
7560 | const sigset_t __user *sig, size_t sigsz, |
7561 | struct __kernel_timespec __user *uts) | |
2b188cc1 | 7562 | { |
90291099 | 7563 | struct io_wait_queue iowq; |
75b28aff | 7564 | struct io_rings *rings = ctx->rings; |
c1d5a224 PB |
7565 | signed long timeout = MAX_SCHEDULE_TIMEOUT; |
7566 | int ret; | |
2b188cc1 | 7567 | |
b41e9852 | 7568 | do { |
90f67366 | 7569 | io_cqring_overflow_flush(ctx); |
6c503150 | 7570 | if (io_cqring_events(ctx) >= min_events) |
b41e9852 | 7571 | return 0; |
4c6e277c | 7572 | if (!io_run_task_work()) |
b41e9852 | 7573 | break; |
b41e9852 | 7574 | } while (1); |
2b188cc1 | 7575 | |
44df58d4 XW |
7576 | if (uts) { |
7577 | struct timespec64 ts; | |
7578 | ||
7579 | if (get_timespec64(&ts, uts)) | |
7580 | return -EFAULT; | |
7581 | timeout = timespec64_to_jiffies(&ts); | |
7582 | } | |
7583 | ||
2b188cc1 | 7584 | if (sig) { |
9e75ad5d AB |
7585 | #ifdef CONFIG_COMPAT |
7586 | if (in_compat_syscall()) | |
7587 | ret = set_compat_user_sigmask((const compat_sigset_t __user *)sig, | |
b772434b | 7588 | sigsz); |
9e75ad5d AB |
7589 | else |
7590 | #endif | |
b772434b | 7591 | ret = set_user_sigmask(sig, sigsz); |
9e75ad5d | 7592 | |
2b188cc1 JA |
7593 | if (ret) |
7594 | return ret; | |
7595 | } | |
7596 | ||
90291099 PB |
7597 | init_waitqueue_func_entry(&iowq.wq, io_wake_function); |
7598 | iowq.wq.private = current; | |
7599 | INIT_LIST_HEAD(&iowq.wq.entry); | |
7600 | iowq.ctx = ctx; | |
bda52162 | 7601 | iowq.nr_timeouts = atomic_read(&ctx->cq_timeouts); |
5fd46178 | 7602 | iowq.cq_tail = READ_ONCE(ctx->rings->cq.head) + min_events; |
90291099 | 7603 | |
c826bd7a | 7604 | trace_io_uring_cqring_wait(ctx, min_events); |
bda52162 | 7605 | do { |
ca0a2651 | 7606 | /* if we can't even flush overflow, don't wait for more */ |
90f67366 | 7607 | if (!io_cqring_overflow_flush(ctx)) { |
ca0a2651 JA |
7608 | ret = -EBUSY; |
7609 | break; | |
7610 | } | |
311997b3 | 7611 | prepare_to_wait_exclusive(&ctx->cq_wait, &iowq.wq, |
bda52162 | 7612 | TASK_INTERRUPTIBLE); |
eeb60b9a | 7613 | ret = io_cqring_wait_schedule(ctx, &iowq, &timeout); |
311997b3 | 7614 | finish_wait(&ctx->cq_wait, &iowq.wq); |
ca0a2651 | 7615 | cond_resched(); |
eeb60b9a | 7616 | } while (ret > 0); |
bda52162 | 7617 | |
b7db41c9 | 7618 | restore_saved_sigmask_unless(ret == -EINTR); |
2b188cc1 | 7619 | |
75b28aff | 7620 | return READ_ONCE(rings->cq.head) == READ_ONCE(rings->cq.tail) ? ret : 0; |
2b188cc1 JA |
7621 | } |
7622 | ||
9123c8ff | 7623 | static void io_free_page_table(void **table, size_t size) |
05f3fb3c | 7624 | { |
9123c8ff | 7625 | unsigned i, nr_tables = DIV_ROUND_UP(size, PAGE_SIZE); |
05f3fb3c | 7626 | |
846a4ef2 | 7627 | for (i = 0; i < nr_tables; i++) |
9123c8ff PB |
7628 | kfree(table[i]); |
7629 | kfree(table); | |
7630 | } | |
7631 | ||
7632 | static void **io_alloc_page_table(size_t size) | |
7633 | { | |
7634 | unsigned i, nr_tables = DIV_ROUND_UP(size, PAGE_SIZE); | |
7635 | size_t init_size = size; | |
7636 | void **table; | |
7637 | ||
0bea96f5 | 7638 | table = kcalloc(nr_tables, sizeof(*table), GFP_KERNEL_ACCOUNT); |
9123c8ff PB |
7639 | if (!table) |
7640 | return NULL; | |
7641 | ||
7642 | for (i = 0; i < nr_tables; i++) { | |
27f6b318 | 7643 | unsigned int this_size = min_t(size_t, size, PAGE_SIZE); |
9123c8ff | 7644 | |
0bea96f5 | 7645 | table[i] = kzalloc(this_size, GFP_KERNEL_ACCOUNT); |
9123c8ff PB |
7646 | if (!table[i]) { |
7647 | io_free_page_table(table, init_size); | |
7648 | return NULL; | |
7649 | } | |
7650 | size -= this_size; | |
7651 | } | |
7652 | return table; | |
05f3fb3c JA |
7653 | } |
7654 | ||
28a9fe25 | 7655 | static void io_rsrc_node_destroy(struct io_rsrc_node *ref_node) |
1642b445 | 7656 | { |
28a9fe25 PB |
7657 | percpu_ref_exit(&ref_node->refs); |
7658 | kfree(ref_node); | |
1642b445 PB |
7659 | } |
7660 | ||
b9bd2bea PB |
7661 | static void io_rsrc_node_ref_zero(struct percpu_ref *ref) |
7662 | { | |
7663 | struct io_rsrc_node *node = container_of(ref, struct io_rsrc_node, refs); | |
7664 | struct io_ring_ctx *ctx = node->rsrc_data->ctx; | |
7665 | unsigned long flags; | |
7666 | bool first_add = false; | |
7667 | ||
7668 | spin_lock_irqsave(&ctx->rsrc_ref_lock, flags); | |
7669 | node->done = true; | |
7670 | ||
7671 | while (!list_empty(&ctx->rsrc_ref_list)) { | |
7672 | node = list_first_entry(&ctx->rsrc_ref_list, | |
7673 | struct io_rsrc_node, node); | |
7674 | /* recycle ref nodes in order */ | |
7675 | if (!node->done) | |
7676 | break; | |
7677 | list_del(&node->node); | |
7678 | first_add |= llist_add(&node->llist, &ctx->rsrc_put_llist); | |
7679 | } | |
7680 | spin_unlock_irqrestore(&ctx->rsrc_ref_lock, flags); | |
7681 | ||
7682 | if (first_add) | |
7683 | mod_delayed_work(system_wq, &ctx->rsrc_put_work, HZ); | |
7684 | } | |
7685 | ||
7686 | static struct io_rsrc_node *io_rsrc_node_alloc(struct io_ring_ctx *ctx) | |
7687 | { | |
7688 | struct io_rsrc_node *ref_node; | |
7689 | ||
7690 | ref_node = kzalloc(sizeof(*ref_node), GFP_KERNEL); | |
7691 | if (!ref_node) | |
7692 | return NULL; | |
7693 | ||
7694 | if (percpu_ref_init(&ref_node->refs, io_rsrc_node_ref_zero, | |
7695 | 0, GFP_KERNEL)) { | |
7696 | kfree(ref_node); | |
7697 | return NULL; | |
7698 | } | |
7699 | INIT_LIST_HEAD(&ref_node->node); | |
7700 | INIT_LIST_HEAD(&ref_node->rsrc_list); | |
7701 | ref_node->done = false; | |
7702 | return ref_node; | |
7703 | } | |
7704 | ||
a7f0ed5a PB |
7705 | static void io_rsrc_node_switch(struct io_ring_ctx *ctx, |
7706 | struct io_rsrc_data *data_to_kill) | |
6b06314c | 7707 | { |
a7f0ed5a PB |
7708 | WARN_ON_ONCE(!ctx->rsrc_backup_node); |
7709 | WARN_ON_ONCE(data_to_kill && !ctx->rsrc_node); | |
6b06314c | 7710 | |
a7f0ed5a PB |
7711 | if (data_to_kill) { |
7712 | struct io_rsrc_node *rsrc_node = ctx->rsrc_node; | |
82fbcfa9 | 7713 | |
a7f0ed5a | 7714 | rsrc_node->rsrc_data = data_to_kill; |
4956b9ea | 7715 | spin_lock_irq(&ctx->rsrc_ref_lock); |
a7f0ed5a | 7716 | list_add_tail(&rsrc_node->node, &ctx->rsrc_ref_list); |
4956b9ea | 7717 | spin_unlock_irq(&ctx->rsrc_ref_lock); |
82fbcfa9 | 7718 | |
3e942498 | 7719 | atomic_inc(&data_to_kill->refs); |
a7f0ed5a PB |
7720 | percpu_ref_kill(&rsrc_node->refs); |
7721 | ctx->rsrc_node = NULL; | |
7722 | } | |
6b06314c | 7723 | |
a7f0ed5a PB |
7724 | if (!ctx->rsrc_node) { |
7725 | ctx->rsrc_node = ctx->rsrc_backup_node; | |
7726 | ctx->rsrc_backup_node = NULL; | |
7727 | } | |
8bad28d8 HX |
7728 | } |
7729 | ||
a7f0ed5a | 7730 | static int io_rsrc_node_switch_start(struct io_ring_ctx *ctx) |
8dd03afe PB |
7731 | { |
7732 | if (ctx->rsrc_backup_node) | |
7733 | return 0; | |
b895c9a6 | 7734 | ctx->rsrc_backup_node = io_rsrc_node_alloc(ctx); |
8dd03afe | 7735 | return ctx->rsrc_backup_node ? 0 : -ENOMEM; |
8bad28d8 HX |
7736 | } |
7737 | ||
40ae0ff7 | 7738 | static int io_rsrc_ref_quiesce(struct io_rsrc_data *data, struct io_ring_ctx *ctx) |
8bad28d8 HX |
7739 | { |
7740 | int ret; | |
05589553 | 7741 | |
215c3902 | 7742 | /* As we may drop ->uring_lock, other task may have started quiesce */ |
8bad28d8 HX |
7743 | if (data->quiesce) |
7744 | return -ENXIO; | |
05589553 | 7745 | |
8bad28d8 | 7746 | data->quiesce = true; |
1ffc5422 | 7747 | do { |
a7f0ed5a | 7748 | ret = io_rsrc_node_switch_start(ctx); |
8dd03afe | 7749 | if (ret) |
f2303b1f | 7750 | break; |
a7f0ed5a | 7751 | io_rsrc_node_switch(ctx, data); |
f2303b1f | 7752 | |
3e942498 PB |
7753 | /* kill initial ref, already quiesced if zero */ |
7754 | if (atomic_dec_and_test(&data->refs)) | |
7755 | break; | |
c018db4a | 7756 | mutex_unlock(&ctx->uring_lock); |
8bad28d8 | 7757 | flush_delayed_work(&ctx->rsrc_put_work); |
1ffc5422 | 7758 | ret = wait_for_completion_interruptible(&data->done); |
c018db4a JA |
7759 | if (!ret) { |
7760 | mutex_lock(&ctx->uring_lock); | |
1ffc5422 | 7761 | break; |
c018db4a | 7762 | } |
8bad28d8 | 7763 | |
3e942498 PB |
7764 | atomic_inc(&data->refs); |
7765 | /* wait for all works potentially completing data->done */ | |
7766 | flush_delayed_work(&ctx->rsrc_put_work); | |
cb5e1b81 | 7767 | reinit_completion(&data->done); |
8dd03afe | 7768 | |
1ffc5422 | 7769 | ret = io_run_task_work_sig(); |
8bad28d8 | 7770 | mutex_lock(&ctx->uring_lock); |
f2303b1f | 7771 | } while (ret >= 0); |
8bad28d8 | 7772 | data->quiesce = false; |
05f3fb3c | 7773 | |
8bad28d8 | 7774 | return ret; |
d7954b2b BM |
7775 | } |
7776 | ||
2d091d62 PB |
7777 | static u64 *io_get_tag_slot(struct io_rsrc_data *data, unsigned int idx) |
7778 | { | |
7779 | unsigned int off = idx & IO_RSRC_TAG_TABLE_MASK; | |
7780 | unsigned int table_idx = idx >> IO_RSRC_TAG_TABLE_SHIFT; | |
7781 | ||
7782 | return &data->tags[table_idx][off]; | |
7783 | } | |
7784 | ||
44b31f2f | 7785 | static void io_rsrc_data_free(struct io_rsrc_data *data) |
1ad555c6 | 7786 | { |
2d091d62 PB |
7787 | size_t size = data->nr * sizeof(data->tags[0][0]); |
7788 | ||
7789 | if (data->tags) | |
7790 | io_free_page_table((void **)data->tags, size); | |
44b31f2f PB |
7791 | kfree(data); |
7792 | } | |
7793 | ||
d878c816 PB |
7794 | static int io_rsrc_data_alloc(struct io_ring_ctx *ctx, rsrc_put_fn *do_put, |
7795 | u64 __user *utags, unsigned nr, | |
7796 | struct io_rsrc_data **pdata) | |
1ad555c6 | 7797 | { |
b895c9a6 | 7798 | struct io_rsrc_data *data; |
2d091d62 | 7799 | int ret = -ENOMEM; |
d878c816 | 7800 | unsigned i; |
1ad555c6 BM |
7801 | |
7802 | data = kzalloc(sizeof(*data), GFP_KERNEL); | |
7803 | if (!data) | |
d878c816 | 7804 | return -ENOMEM; |
2d091d62 | 7805 | data->tags = (u64 **)io_alloc_page_table(nr * sizeof(data->tags[0][0])); |
b60c8dce | 7806 | if (!data->tags) { |
1ad555c6 | 7807 | kfree(data); |
d878c816 PB |
7808 | return -ENOMEM; |
7809 | } | |
2d091d62 PB |
7810 | |
7811 | data->nr = nr; | |
7812 | data->ctx = ctx; | |
7813 | data->do_put = do_put; | |
d878c816 | 7814 | if (utags) { |
2d091d62 | 7815 | ret = -EFAULT; |
d878c816 | 7816 | for (i = 0; i < nr; i++) { |
fdd1dc31 CIK |
7817 | u64 *tag_slot = io_get_tag_slot(data, i); |
7818 | ||
7819 | if (copy_from_user(tag_slot, &utags[i], | |
7820 | sizeof(*tag_slot))) | |
2d091d62 | 7821 | goto fail; |
d878c816 | 7822 | } |
1ad555c6 | 7823 | } |
b60c8dce | 7824 | |
3e942498 | 7825 | atomic_set(&data->refs, 1); |
1ad555c6 | 7826 | init_completion(&data->done); |
d878c816 PB |
7827 | *pdata = data; |
7828 | return 0; | |
2d091d62 PB |
7829 | fail: |
7830 | io_rsrc_data_free(data); | |
7831 | return ret; | |
1ad555c6 BM |
7832 | } |
7833 | ||
9123c8ff PB |
7834 | static bool io_alloc_file_tables(struct io_file_table *table, unsigned nr_files) |
7835 | { | |
0bea96f5 PB |
7836 | table->files = kvcalloc(nr_files, sizeof(table->files[0]), |
7837 | GFP_KERNEL_ACCOUNT); | |
9123c8ff PB |
7838 | return !!table->files; |
7839 | } | |
7840 | ||
042b0d85 | 7841 | static void io_free_file_tables(struct io_file_table *table) |
9123c8ff | 7842 | { |
042b0d85 | 7843 | kvfree(table->files); |
9123c8ff PB |
7844 | table->files = NULL; |
7845 | } | |
7846 | ||
fff4db76 | 7847 | static void __io_sqe_files_unregister(struct io_ring_ctx *ctx) |
1ad555c6 | 7848 | { |
fff4db76 PB |
7849 | #if defined(CONFIG_UNIX) |
7850 | if (ctx->ring_sock) { | |
7851 | struct sock *sock = ctx->ring_sock->sk; | |
7852 | struct sk_buff *skb; | |
7853 | ||
7854 | while ((skb = skb_dequeue(&sock->sk_receive_queue)) != NULL) | |
7855 | kfree_skb(skb); | |
7856 | } | |
7857 | #else | |
7858 | int i; | |
7859 | ||
7860 | for (i = 0; i < ctx->nr_user_files; i++) { | |
7861 | struct file *file; | |
7862 | ||
7863 | file = io_file_from_index(ctx, i); | |
7864 | if (file) | |
7865 | fput(file); | |
7866 | } | |
7867 | #endif | |
042b0d85 | 7868 | io_free_file_tables(&ctx->file_table); |
44b31f2f | 7869 | io_rsrc_data_free(ctx->file_data); |
fff4db76 PB |
7870 | ctx->file_data = NULL; |
7871 | ctx->nr_user_files = 0; | |
1ad555c6 BM |
7872 | } |
7873 | ||
d7954b2b BM |
7874 | static int io_sqe_files_unregister(struct io_ring_ctx *ctx) |
7875 | { | |
d7954b2b BM |
7876 | int ret; |
7877 | ||
08480400 | 7878 | if (!ctx->file_data) |
d7954b2b | 7879 | return -ENXIO; |
08480400 PB |
7880 | ret = io_rsrc_ref_quiesce(ctx->file_data, ctx); |
7881 | if (!ret) | |
7882 | __io_sqe_files_unregister(ctx); | |
7883 | return ret; | |
6b06314c JA |
7884 | } |
7885 | ||
37d1e2e3 | 7886 | static void io_sq_thread_unpark(struct io_sq_data *sqd) |
09a6f4ef | 7887 | __releases(&sqd->lock) |
37d1e2e3 | 7888 | { |
521d6a73 PB |
7889 | WARN_ON_ONCE(sqd->thread == current); |
7890 | ||
9e138a48 PB |
7891 | /* |
7892 | * Do the dance but not conditional clear_bit() because it'd race with | |
7893 | * other threads incrementing park_pending and setting the bit. | |
7894 | */ | |
37d1e2e3 | 7895 | clear_bit(IO_SQ_THREAD_SHOULD_PARK, &sqd->state); |
9e138a48 PB |
7896 | if (atomic_dec_return(&sqd->park_pending)) |
7897 | set_bit(IO_SQ_THREAD_SHOULD_PARK, &sqd->state); | |
09a6f4ef | 7898 | mutex_unlock(&sqd->lock); |
37d1e2e3 JA |
7899 | } |
7900 | ||
86e0d676 | 7901 | static void io_sq_thread_park(struct io_sq_data *sqd) |
09a6f4ef | 7902 | __acquires(&sqd->lock) |
37d1e2e3 | 7903 | { |
521d6a73 PB |
7904 | WARN_ON_ONCE(sqd->thread == current); |
7905 | ||
9e138a48 | 7906 | atomic_inc(&sqd->park_pending); |
86e0d676 | 7907 | set_bit(IO_SQ_THREAD_SHOULD_PARK, &sqd->state); |
09a6f4ef | 7908 | mutex_lock(&sqd->lock); |
05962f95 | 7909 | if (sqd->thread) |
86e0d676 | 7910 | wake_up_process(sqd->thread); |
37d1e2e3 JA |
7911 | } |
7912 | ||
7913 | static void io_sq_thread_stop(struct io_sq_data *sqd) | |
7914 | { | |
521d6a73 | 7915 | WARN_ON_ONCE(sqd->thread == current); |
88885f66 | 7916 | WARN_ON_ONCE(test_bit(IO_SQ_THREAD_SHOULD_STOP, &sqd->state)); |
521d6a73 | 7917 | |
05962f95 | 7918 | set_bit(IO_SQ_THREAD_SHOULD_STOP, &sqd->state); |
88885f66 | 7919 | mutex_lock(&sqd->lock); |
e8f98f24 JA |
7920 | if (sqd->thread) |
7921 | wake_up_process(sqd->thread); | |
09a6f4ef | 7922 | mutex_unlock(&sqd->lock); |
05962f95 | 7923 | wait_for_completion(&sqd->exited); |
37d1e2e3 JA |
7924 | } |
7925 | ||
534ca6d6 | 7926 | static void io_put_sq_data(struct io_sq_data *sqd) |
6c271ce2 | 7927 | { |
534ca6d6 | 7928 | if (refcount_dec_and_test(&sqd->refs)) { |
9e138a48 PB |
7929 | WARN_ON_ONCE(atomic_read(&sqd->park_pending)); |
7930 | ||
37d1e2e3 JA |
7931 | io_sq_thread_stop(sqd); |
7932 | kfree(sqd); | |
7933 | } | |
7934 | } | |
7935 | ||
7936 | static void io_sq_thread_finish(struct io_ring_ctx *ctx) | |
7937 | { | |
7938 | struct io_sq_data *sqd = ctx->sq_data; | |
7939 | ||
7940 | if (sqd) { | |
05962f95 | 7941 | io_sq_thread_park(sqd); |
521d6a73 | 7942 | list_del_init(&ctx->sqd_list); |
37d1e2e3 | 7943 | io_sqd_update_thread_idle(sqd); |
05962f95 | 7944 | io_sq_thread_unpark(sqd); |
37d1e2e3 JA |
7945 | |
7946 | io_put_sq_data(sqd); | |
7947 | ctx->sq_data = NULL; | |
534ca6d6 JA |
7948 | } |
7949 | } | |
7950 | ||
aa06165d JA |
7951 | static struct io_sq_data *io_attach_sq_data(struct io_uring_params *p) |
7952 | { | |
7953 | struct io_ring_ctx *ctx_attach; | |
7954 | struct io_sq_data *sqd; | |
7955 | struct fd f; | |
7956 | ||
7957 | f = fdget(p->wq_fd); | |
7958 | if (!f.file) | |
7959 | return ERR_PTR(-ENXIO); | |
7960 | if (f.file->f_op != &io_uring_fops) { | |
7961 | fdput(f); | |
7962 | return ERR_PTR(-EINVAL); | |
7963 | } | |
7964 | ||
7965 | ctx_attach = f.file->private_data; | |
7966 | sqd = ctx_attach->sq_data; | |
7967 | if (!sqd) { | |
7968 | fdput(f); | |
7969 | return ERR_PTR(-EINVAL); | |
7970 | } | |
5c2469e0 JA |
7971 | if (sqd->task_tgid != current->tgid) { |
7972 | fdput(f); | |
7973 | return ERR_PTR(-EPERM); | |
7974 | } | |
aa06165d JA |
7975 | |
7976 | refcount_inc(&sqd->refs); | |
7977 | fdput(f); | |
7978 | return sqd; | |
7979 | } | |
7980 | ||
26984fbf PB |
7981 | static struct io_sq_data *io_get_sq_data(struct io_uring_params *p, |
7982 | bool *attached) | |
534ca6d6 JA |
7983 | { |
7984 | struct io_sq_data *sqd; | |
7985 | ||
26984fbf | 7986 | *attached = false; |
5c2469e0 JA |
7987 | if (p->flags & IORING_SETUP_ATTACH_WQ) { |
7988 | sqd = io_attach_sq_data(p); | |
26984fbf PB |
7989 | if (!IS_ERR(sqd)) { |
7990 | *attached = true; | |
5c2469e0 | 7991 | return sqd; |
26984fbf | 7992 | } |
5c2469e0 JA |
7993 | /* fall through for EPERM case, setup new sqd/task */ |
7994 | if (PTR_ERR(sqd) != -EPERM) | |
7995 | return sqd; | |
7996 | } | |
aa06165d | 7997 | |
534ca6d6 JA |
7998 | sqd = kzalloc(sizeof(*sqd), GFP_KERNEL); |
7999 | if (!sqd) | |
8000 | return ERR_PTR(-ENOMEM); | |
8001 | ||
9e138a48 | 8002 | atomic_set(&sqd->park_pending, 0); |
534ca6d6 | 8003 | refcount_set(&sqd->refs, 1); |
69fb2131 | 8004 | INIT_LIST_HEAD(&sqd->ctx_list); |
09a6f4ef | 8005 | mutex_init(&sqd->lock); |
534ca6d6 | 8006 | init_waitqueue_head(&sqd->wait); |
37d1e2e3 | 8007 | init_completion(&sqd->exited); |
534ca6d6 JA |
8008 | return sqd; |
8009 | } | |
8010 | ||
6b06314c | 8011 | #if defined(CONFIG_UNIX) |
6b06314c JA |
8012 | /* |
8013 | * Ensure the UNIX gc is aware of our file set, so we are certain that | |
8014 | * the io_uring can be safely unregistered on process exit, even if we have | |
8015 | * loops in the file referencing. | |
8016 | */ | |
8017 | static int __io_sqe_files_scm(struct io_ring_ctx *ctx, int nr, int offset) | |
8018 | { | |
8019 | struct sock *sk = ctx->ring_sock->sk; | |
8020 | struct scm_fp_list *fpl; | |
8021 | struct sk_buff *skb; | |
08a45173 | 8022 | int i, nr_files; |
6b06314c | 8023 | |
6b06314c JA |
8024 | fpl = kzalloc(sizeof(*fpl), GFP_KERNEL); |
8025 | if (!fpl) | |
8026 | return -ENOMEM; | |
8027 | ||
8028 | skb = alloc_skb(0, GFP_KERNEL); | |
8029 | if (!skb) { | |
8030 | kfree(fpl); | |
8031 | return -ENOMEM; | |
8032 | } | |
8033 | ||
8034 | skb->sk = sk; | |
6b06314c | 8035 | |
08a45173 | 8036 | nr_files = 0; |
62e398be | 8037 | fpl->user = get_uid(current_user()); |
6b06314c | 8038 | for (i = 0; i < nr; i++) { |
65e19f54 JA |
8039 | struct file *file = io_file_from_index(ctx, i + offset); |
8040 | ||
8041 | if (!file) | |
08a45173 | 8042 | continue; |
65e19f54 | 8043 | fpl->fp[nr_files] = get_file(file); |
08a45173 JA |
8044 | unix_inflight(fpl->user, fpl->fp[nr_files]); |
8045 | nr_files++; | |
6b06314c JA |
8046 | } |
8047 | ||
08a45173 JA |
8048 | if (nr_files) { |
8049 | fpl->max = SCM_MAX_FD; | |
8050 | fpl->count = nr_files; | |
8051 | UNIXCB(skb).fp = fpl; | |
05f3fb3c | 8052 | skb->destructor = unix_destruct_scm; |
08a45173 JA |
8053 | refcount_add(skb->truesize, &sk->sk_wmem_alloc); |
8054 | skb_queue_head(&sk->sk_receive_queue, skb); | |
6b06314c | 8055 | |
08a45173 JA |
8056 | for (i = 0; i < nr_files; i++) |
8057 | fput(fpl->fp[i]); | |
8058 | } else { | |
8059 | kfree_skb(skb); | |
8060 | kfree(fpl); | |
8061 | } | |
6b06314c JA |
8062 | |
8063 | return 0; | |
8064 | } | |
8065 | ||
8066 | /* | |
8067 | * If UNIX sockets are enabled, fd passing can cause a reference cycle which | |
8068 | * causes regular reference counting to break down. We rely on the UNIX | |
8069 | * garbage collection to take care of this problem for us. | |
8070 | */ | |
8071 | static int io_sqe_files_scm(struct io_ring_ctx *ctx) | |
8072 | { | |
8073 | unsigned left, total; | |
8074 | int ret = 0; | |
8075 | ||
8076 | total = 0; | |
8077 | left = ctx->nr_user_files; | |
8078 | while (left) { | |
8079 | unsigned this_files = min_t(unsigned, left, SCM_MAX_FD); | |
6b06314c JA |
8080 | |
8081 | ret = __io_sqe_files_scm(ctx, this_files, total); | |
8082 | if (ret) | |
8083 | break; | |
8084 | left -= this_files; | |
8085 | total += this_files; | |
8086 | } | |
8087 | ||
8088 | if (!ret) | |
8089 | return 0; | |
8090 | ||
8091 | while (total < ctx->nr_user_files) { | |
65e19f54 JA |
8092 | struct file *file = io_file_from_index(ctx, total); |
8093 | ||
8094 | if (file) | |
8095 | fput(file); | |
6b06314c JA |
8096 | total++; |
8097 | } | |
8098 | ||
8099 | return ret; | |
8100 | } | |
8101 | #else | |
8102 | static int io_sqe_files_scm(struct io_ring_ctx *ctx) | |
8103 | { | |
8104 | return 0; | |
8105 | } | |
8106 | #endif | |
8107 | ||
47e90392 | 8108 | static void io_rsrc_file_put(struct io_ring_ctx *ctx, struct io_rsrc_put *prsrc) |
05f3fb3c | 8109 | { |
50238531 | 8110 | struct file *file = prsrc->file; |
05f3fb3c JA |
8111 | #if defined(CONFIG_UNIX) |
8112 | struct sock *sock = ctx->ring_sock->sk; | |
8113 | struct sk_buff_head list, *head = &sock->sk_receive_queue; | |
8114 | struct sk_buff *skb; | |
8115 | int i; | |
8116 | ||
8117 | __skb_queue_head_init(&list); | |
8118 | ||
8119 | /* | |
8120 | * Find the skb that holds this file in its SCM_RIGHTS. When found, | |
8121 | * remove this entry and rearrange the file array. | |
8122 | */ | |
8123 | skb = skb_dequeue(head); | |
8124 | while (skb) { | |
8125 | struct scm_fp_list *fp; | |
8126 | ||
8127 | fp = UNIXCB(skb).fp; | |
8128 | for (i = 0; i < fp->count; i++) { | |
8129 | int left; | |
8130 | ||
8131 | if (fp->fp[i] != file) | |
8132 | continue; | |
8133 | ||
8134 | unix_notinflight(fp->user, fp->fp[i]); | |
8135 | left = fp->count - 1 - i; | |
8136 | if (left) { | |
8137 | memmove(&fp->fp[i], &fp->fp[i + 1], | |
8138 | left * sizeof(struct file *)); | |
8139 | } | |
8140 | fp->count--; | |
8141 | if (!fp->count) { | |
8142 | kfree_skb(skb); | |
8143 | skb = NULL; | |
8144 | } else { | |
8145 | __skb_queue_tail(&list, skb); | |
8146 | } | |
8147 | fput(file); | |
8148 | file = NULL; | |
8149 | break; | |
8150 | } | |
8151 | ||
8152 | if (!file) | |
8153 | break; | |
8154 | ||
8155 | __skb_queue_tail(&list, skb); | |
8156 | ||
8157 | skb = skb_dequeue(head); | |
8158 | } | |
8159 | ||
8160 | if (skb_peek(&list)) { | |
8161 | spin_lock_irq(&head->lock); | |
8162 | while ((skb = __skb_dequeue(&list)) != NULL) | |
8163 | __skb_queue_tail(head, skb); | |
8164 | spin_unlock_irq(&head->lock); | |
8165 | } | |
8166 | #else | |
8167 | fput(file); | |
8168 | #endif | |
8169 | } | |
8170 | ||
b895c9a6 | 8171 | static void __io_rsrc_put_work(struct io_rsrc_node *ref_node) |
65e19f54 | 8172 | { |
b895c9a6 | 8173 | struct io_rsrc_data *rsrc_data = ref_node->rsrc_data; |
269bbe5f BM |
8174 | struct io_ring_ctx *ctx = rsrc_data->ctx; |
8175 | struct io_rsrc_put *prsrc, *tmp; | |
05589553 | 8176 | |
269bbe5f BM |
8177 | list_for_each_entry_safe(prsrc, tmp, &ref_node->rsrc_list, list) { |
8178 | list_del(&prsrc->list); | |
b60c8dce PB |
8179 | |
8180 | if (prsrc->tag) { | |
8181 | bool lock_ring = ctx->flags & IORING_SETUP_IOPOLL; | |
b60c8dce PB |
8182 | |
8183 | io_ring_submit_lock(ctx, lock_ring); | |
79ebeaee | 8184 | spin_lock(&ctx->completion_lock); |
b60c8dce | 8185 | io_cqring_fill_event(ctx, prsrc->tag, 0, 0); |
2840f710 | 8186 | ctx->cq_extra++; |
b60c8dce | 8187 | io_commit_cqring(ctx); |
79ebeaee | 8188 | spin_unlock(&ctx->completion_lock); |
b60c8dce PB |
8189 | io_cqring_ev_posted(ctx); |
8190 | io_ring_submit_unlock(ctx, lock_ring); | |
8191 | } | |
8192 | ||
40ae0ff7 | 8193 | rsrc_data->do_put(ctx, prsrc); |
269bbe5f | 8194 | kfree(prsrc); |
65e19f54 | 8195 | } |
05589553 | 8196 | |
28a9fe25 | 8197 | io_rsrc_node_destroy(ref_node); |
3e942498 PB |
8198 | if (atomic_dec_and_test(&rsrc_data->refs)) |
8199 | complete(&rsrc_data->done); | |
2faf852d | 8200 | } |
65e19f54 | 8201 | |
269bbe5f | 8202 | static void io_rsrc_put_work(struct work_struct *work) |
4a38aed2 JA |
8203 | { |
8204 | struct io_ring_ctx *ctx; | |
8205 | struct llist_node *node; | |
8206 | ||
269bbe5f BM |
8207 | ctx = container_of(work, struct io_ring_ctx, rsrc_put_work.work); |
8208 | node = llist_del_all(&ctx->rsrc_put_llist); | |
4a38aed2 JA |
8209 | |
8210 | while (node) { | |
b895c9a6 | 8211 | struct io_rsrc_node *ref_node; |
4a38aed2 JA |
8212 | struct llist_node *next = node->next; |
8213 | ||
b895c9a6 | 8214 | ref_node = llist_entry(node, struct io_rsrc_node, llist); |
269bbe5f | 8215 | __io_rsrc_put_work(ref_node); |
4a38aed2 JA |
8216 | node = next; |
8217 | } | |
8218 | } | |
8219 | ||
6b06314c | 8220 | static int io_sqe_files_register(struct io_ring_ctx *ctx, void __user *arg, |
792e3582 | 8221 | unsigned nr_args, u64 __user *tags) |
6b06314c JA |
8222 | { |
8223 | __s32 __user *fds = (__s32 __user *) arg; | |
05f3fb3c | 8224 | struct file *file; |
f3baed39 | 8225 | int fd, ret; |
846a4ef2 | 8226 | unsigned i; |
6b06314c | 8227 | |
05f3fb3c | 8228 | if (ctx->file_data) |
6b06314c JA |
8229 | return -EBUSY; |
8230 | if (!nr_args) | |
8231 | return -EINVAL; | |
8232 | if (nr_args > IORING_MAX_FIXED_FILES) | |
8233 | return -EMFILE; | |
3a1b8a4e PB |
8234 | if (nr_args > rlimit(RLIMIT_NOFILE)) |
8235 | return -EMFILE; | |
a7f0ed5a | 8236 | ret = io_rsrc_node_switch_start(ctx); |
f3baed39 PB |
8237 | if (ret) |
8238 | return ret; | |
d878c816 PB |
8239 | ret = io_rsrc_data_alloc(ctx, io_rsrc_file_put, tags, nr_args, |
8240 | &ctx->file_data); | |
8241 | if (ret) | |
8242 | return ret; | |
6b06314c | 8243 | |
f3baed39 | 8244 | ret = -ENOMEM; |
aeca241b | 8245 | if (!io_alloc_file_tables(&ctx->file_table, nr_args)) |
1ad555c6 | 8246 | goto out_free; |
65e19f54 | 8247 | |
08a45173 | 8248 | for (i = 0; i < nr_args; i++, ctx->nr_user_files++) { |
d878c816 | 8249 | if (copy_from_user(&fd, &fds[i], sizeof(fd))) { |
600cf3f8 PB |
8250 | ret = -EFAULT; |
8251 | goto out_fput; | |
8252 | } | |
08a45173 | 8253 | /* allow sparse sets */ |
792e3582 PB |
8254 | if (fd == -1) { |
8255 | ret = -EINVAL; | |
2d091d62 | 8256 | if (unlikely(*io_get_tag_slot(ctx->file_data, i))) |
792e3582 | 8257 | goto out_fput; |
08a45173 | 8258 | continue; |
792e3582 | 8259 | } |
6b06314c | 8260 | |
05f3fb3c | 8261 | file = fget(fd); |
6b06314c | 8262 | ret = -EBADF; |
792e3582 | 8263 | if (unlikely(!file)) |
600cf3f8 | 8264 | goto out_fput; |
05f3fb3c | 8265 | |
6b06314c JA |
8266 | /* |
8267 | * Don't allow io_uring instances to be registered. If UNIX | |
8268 | * isn't enabled, then this causes a reference cycle and this | |
8269 | * instance can never get freed. If UNIX is enabled we'll | |
8270 | * handle it just fine, but there's still no point in allowing | |
8271 | * a ring fd as it doesn't support regular read/write anyway. | |
8272 | */ | |
05f3fb3c JA |
8273 | if (file->f_op == &io_uring_fops) { |
8274 | fput(file); | |
600cf3f8 | 8275 | goto out_fput; |
6b06314c | 8276 | } |
aeca241b | 8277 | io_fixed_file_set(io_fixed_file_slot(&ctx->file_table, i), file); |
6b06314c JA |
8278 | } |
8279 | ||
6b06314c | 8280 | ret = io_sqe_files_scm(ctx); |
05589553 | 8281 | if (ret) { |
08480400 | 8282 | __io_sqe_files_unregister(ctx); |
05589553 XW |
8283 | return ret; |
8284 | } | |
6b06314c | 8285 | |
a7f0ed5a | 8286 | io_rsrc_node_switch(ctx, NULL); |
6b06314c | 8287 | return ret; |
600cf3f8 PB |
8288 | out_fput: |
8289 | for (i = 0; i < ctx->nr_user_files; i++) { | |
8290 | file = io_file_from_index(ctx, i); | |
8291 | if (file) | |
8292 | fput(file); | |
8293 | } | |
042b0d85 | 8294 | io_free_file_tables(&ctx->file_table); |
600cf3f8 | 8295 | ctx->nr_user_files = 0; |
600cf3f8 | 8296 | out_free: |
44b31f2f | 8297 | io_rsrc_data_free(ctx->file_data); |
55cbc256 | 8298 | ctx->file_data = NULL; |
6b06314c JA |
8299 | return ret; |
8300 | } | |
8301 | ||
c3a31e60 JA |
8302 | static int io_sqe_file_register(struct io_ring_ctx *ctx, struct file *file, |
8303 | int index) | |
8304 | { | |
8305 | #if defined(CONFIG_UNIX) | |
8306 | struct sock *sock = ctx->ring_sock->sk; | |
8307 | struct sk_buff_head *head = &sock->sk_receive_queue; | |
8308 | struct sk_buff *skb; | |
8309 | ||
8310 | /* | |
8311 | * See if we can merge this file into an existing skb SCM_RIGHTS | |
8312 | * file set. If there's no room, fall back to allocating a new skb | |
8313 | * and filling it in. | |
8314 | */ | |
8315 | spin_lock_irq(&head->lock); | |
8316 | skb = skb_peek(head); | |
8317 | if (skb) { | |
8318 | struct scm_fp_list *fpl = UNIXCB(skb).fp; | |
8319 | ||
8320 | if (fpl->count < SCM_MAX_FD) { | |
8321 | __skb_unlink(skb, head); | |
8322 | spin_unlock_irq(&head->lock); | |
8323 | fpl->fp[fpl->count] = get_file(file); | |
8324 | unix_inflight(fpl->user, fpl->fp[fpl->count]); | |
8325 | fpl->count++; | |
8326 | spin_lock_irq(&head->lock); | |
8327 | __skb_queue_head(head, skb); | |
8328 | } else { | |
8329 | skb = NULL; | |
8330 | } | |
8331 | } | |
8332 | spin_unlock_irq(&head->lock); | |
8333 | ||
8334 | if (skb) { | |
8335 | fput(file); | |
8336 | return 0; | |
8337 | } | |
8338 | ||
8339 | return __io_sqe_files_scm(ctx, 1, index); | |
8340 | #else | |
8341 | return 0; | |
8342 | #endif | |
8343 | } | |
8344 | ||
9c7b0ba8 PB |
8345 | static int io_queue_rsrc_removal(struct io_rsrc_data *data, unsigned idx, |
8346 | struct io_rsrc_node *node, void *rsrc) | |
8347 | { | |
8348 | struct io_rsrc_put *prsrc; | |
8349 | ||
8350 | prsrc = kzalloc(sizeof(*prsrc), GFP_KERNEL); | |
8351 | if (!prsrc) | |
8352 | return -ENOMEM; | |
8353 | ||
8354 | prsrc->tag = *io_get_tag_slot(data, idx); | |
8355 | prsrc->rsrc = rsrc; | |
8356 | list_add(&prsrc->list, &node->rsrc_list); | |
8357 | return 0; | |
8358 | } | |
8359 | ||
b9445598 PB |
8360 | static int io_install_fixed_file(struct io_kiocb *req, struct file *file, |
8361 | unsigned int issue_flags, u32 slot_index) | |
8362 | { | |
8363 | struct io_ring_ctx *ctx = req->ctx; | |
8364 | bool force_nonblock = issue_flags & IO_URING_F_NONBLOCK; | |
9c7b0ba8 | 8365 | bool needs_switch = false; |
b9445598 PB |
8366 | struct io_fixed_file *file_slot; |
8367 | int ret = -EBADF; | |
8368 | ||
8369 | io_ring_submit_lock(ctx, !force_nonblock); | |
8370 | if (file->f_op == &io_uring_fops) | |
8371 | goto err; | |
8372 | ret = -ENXIO; | |
8373 | if (!ctx->file_data) | |
8374 | goto err; | |
8375 | ret = -EINVAL; | |
8376 | if (slot_index >= ctx->nr_user_files) | |
8377 | goto err; | |
8378 | ||
8379 | slot_index = array_index_nospec(slot_index, ctx->nr_user_files); | |
8380 | file_slot = io_fixed_file_slot(&ctx->file_table, slot_index); | |
9c7b0ba8 PB |
8381 | |
8382 | if (file_slot->file_ptr) { | |
8383 | struct file *old_file; | |
8384 | ||
8385 | ret = io_rsrc_node_switch_start(ctx); | |
8386 | if (ret) | |
8387 | goto err; | |
8388 | ||
8389 | old_file = (struct file *)(file_slot->file_ptr & FFS_MASK); | |
8390 | ret = io_queue_rsrc_removal(ctx->file_data, slot_index, | |
8391 | ctx->rsrc_node, old_file); | |
8392 | if (ret) | |
8393 | goto err; | |
8394 | file_slot->file_ptr = 0; | |
8395 | needs_switch = true; | |
8396 | } | |
b9445598 PB |
8397 | |
8398 | *io_get_tag_slot(ctx->file_data, slot_index) = 0; | |
8399 | io_fixed_file_set(file_slot, file); | |
8400 | ret = io_sqe_file_register(ctx, file, slot_index); | |
8401 | if (ret) { | |
8402 | file_slot->file_ptr = 0; | |
8403 | goto err; | |
8404 | } | |
8405 | ||
8406 | ret = 0; | |
8407 | err: | |
9c7b0ba8 PB |
8408 | if (needs_switch) |
8409 | io_rsrc_node_switch(ctx, ctx->file_data); | |
b9445598 PB |
8410 | io_ring_submit_unlock(ctx, !force_nonblock); |
8411 | if (ret) | |
8412 | fput(file); | |
8413 | return ret; | |
8414 | } | |
8415 | ||
7df778be PB |
8416 | static int io_close_fixed(struct io_kiocb *req, unsigned int issue_flags) |
8417 | { | |
8418 | unsigned int offset = req->close.file_slot - 1; | |
8419 | struct io_ring_ctx *ctx = req->ctx; | |
8420 | struct io_fixed_file *file_slot; | |
8421 | struct file *file; | |
8422 | int ret, i; | |
8423 | ||
8424 | io_ring_submit_lock(ctx, !(issue_flags & IO_URING_F_NONBLOCK)); | |
8425 | ret = -ENXIO; | |
8426 | if (unlikely(!ctx->file_data)) | |
8427 | goto out; | |
8428 | ret = -EINVAL; | |
8429 | if (offset >= ctx->nr_user_files) | |
8430 | goto out; | |
8431 | ret = io_rsrc_node_switch_start(ctx); | |
8432 | if (ret) | |
8433 | goto out; | |
8434 | ||
8435 | i = array_index_nospec(offset, ctx->nr_user_files); | |
8436 | file_slot = io_fixed_file_slot(&ctx->file_table, i); | |
8437 | ret = -EBADF; | |
8438 | if (!file_slot->file_ptr) | |
8439 | goto out; | |
8440 | ||
8441 | file = (struct file *)(file_slot->file_ptr & FFS_MASK); | |
8442 | ret = io_queue_rsrc_removal(ctx->file_data, offset, ctx->rsrc_node, file); | |
8443 | if (ret) | |
8444 | goto out; | |
8445 | ||
8446 | file_slot->file_ptr = 0; | |
8447 | io_rsrc_node_switch(ctx, ctx->file_data); | |
8448 | ret = 0; | |
8449 | out: | |
8450 | io_ring_submit_unlock(ctx, !(issue_flags & IO_URING_F_NONBLOCK)); | |
8451 | return ret; | |
8452 | } | |
8453 | ||
05f3fb3c | 8454 | static int __io_sqe_files_update(struct io_ring_ctx *ctx, |
c3bdad02 | 8455 | struct io_uring_rsrc_update2 *up, |
05f3fb3c JA |
8456 | unsigned nr_args) |
8457 | { | |
c3bdad02 | 8458 | u64 __user *tags = u64_to_user_ptr(up->tags); |
98f0b3b4 | 8459 | __s32 __user *fds = u64_to_user_ptr(up->data); |
b895c9a6 | 8460 | struct io_rsrc_data *data = ctx->file_data; |
a04b0ac0 PB |
8461 | struct io_fixed_file *file_slot; |
8462 | struct file *file; | |
98f0b3b4 PB |
8463 | int fd, i, err = 0; |
8464 | unsigned int done; | |
05589553 | 8465 | bool needs_switch = false; |
c3a31e60 | 8466 | |
98f0b3b4 PB |
8467 | if (!ctx->file_data) |
8468 | return -ENXIO; | |
8469 | if (up->offset + nr_args > ctx->nr_user_files) | |
c3a31e60 JA |
8470 | return -EINVAL; |
8471 | ||
67973b93 | 8472 | for (done = 0; done < nr_args; done++) { |
c3bdad02 PB |
8473 | u64 tag = 0; |
8474 | ||
8475 | if ((tags && copy_from_user(&tag, &tags[done], sizeof(tag))) || | |
8476 | copy_from_user(&fd, &fds[done], sizeof(fd))) { | |
c3a31e60 JA |
8477 | err = -EFAULT; |
8478 | break; | |
8479 | } | |
c3bdad02 PB |
8480 | if ((fd == IORING_REGISTER_FILES_SKIP || fd == -1) && tag) { |
8481 | err = -EINVAL; | |
8482 | break; | |
8483 | } | |
4e0377a1 | 8484 | if (fd == IORING_REGISTER_FILES_SKIP) |
8485 | continue; | |
8486 | ||
67973b93 | 8487 | i = array_index_nospec(up->offset + done, ctx->nr_user_files); |
aeca241b | 8488 | file_slot = io_fixed_file_slot(&ctx->file_table, i); |
ea64ec02 | 8489 | |
a04b0ac0 PB |
8490 | if (file_slot->file_ptr) { |
8491 | file = (struct file *)(file_slot->file_ptr & FFS_MASK); | |
b60c8dce PB |
8492 | err = io_queue_rsrc_removal(data, up->offset + done, |
8493 | ctx->rsrc_node, file); | |
a5318d3c HD |
8494 | if (err) |
8495 | break; | |
a04b0ac0 | 8496 | file_slot->file_ptr = 0; |
05589553 | 8497 | needs_switch = true; |
c3a31e60 JA |
8498 | } |
8499 | if (fd != -1) { | |
c3a31e60 JA |
8500 | file = fget(fd); |
8501 | if (!file) { | |
8502 | err = -EBADF; | |
8503 | break; | |
8504 | } | |
8505 | /* | |
8506 | * Don't allow io_uring instances to be registered. If | |
8507 | * UNIX isn't enabled, then this causes a reference | |
8508 | * cycle and this instance can never get freed. If UNIX | |
8509 | * is enabled we'll handle it just fine, but there's | |
8510 | * still no point in allowing a ring fd as it doesn't | |
8511 | * support regular read/write anyway. | |
8512 | */ | |
8513 | if (file->f_op == &io_uring_fops) { | |
8514 | fput(file); | |
8515 | err = -EBADF; | |
8516 | break; | |
8517 | } | |
2d091d62 | 8518 | *io_get_tag_slot(data, up->offset + done) = tag; |
9a321c98 | 8519 | io_fixed_file_set(file_slot, file); |
c3a31e60 | 8520 | err = io_sqe_file_register(ctx, file, i); |
f3bd9dae | 8521 | if (err) { |
a04b0ac0 | 8522 | file_slot->file_ptr = 0; |
f3bd9dae | 8523 | fput(file); |
c3a31e60 | 8524 | break; |
f3bd9dae | 8525 | } |
c3a31e60 | 8526 | } |
05f3fb3c JA |
8527 | } |
8528 | ||
a7f0ed5a PB |
8529 | if (needs_switch) |
8530 | io_rsrc_node_switch(ctx, data); | |
c3a31e60 JA |
8531 | return done ? done : err; |
8532 | } | |
05589553 | 8533 | |
685fe7fe JA |
8534 | static struct io_wq *io_init_wq_offload(struct io_ring_ctx *ctx, |
8535 | struct task_struct *task) | |
24369c2e | 8536 | { |
e941894e | 8537 | struct io_wq_hash *hash; |
24369c2e | 8538 | struct io_wq_data data; |
24369c2e | 8539 | unsigned int concurrency; |
24369c2e | 8540 | |
362a9e65 | 8541 | mutex_lock(&ctx->uring_lock); |
e941894e JA |
8542 | hash = ctx->hash_map; |
8543 | if (!hash) { | |
8544 | hash = kzalloc(sizeof(*hash), GFP_KERNEL); | |
362a9e65 YY |
8545 | if (!hash) { |
8546 | mutex_unlock(&ctx->uring_lock); | |
e941894e | 8547 | return ERR_PTR(-ENOMEM); |
362a9e65 | 8548 | } |
e941894e JA |
8549 | refcount_set(&hash->refs, 1); |
8550 | init_waitqueue_head(&hash->wait); | |
8551 | ctx->hash_map = hash; | |
24369c2e | 8552 | } |
362a9e65 | 8553 | mutex_unlock(&ctx->uring_lock); |
24369c2e | 8554 | |
e941894e | 8555 | data.hash = hash; |
685fe7fe | 8556 | data.task = task; |
ebc11b6c | 8557 | data.free_work = io_wq_free_work; |
f5fa38c5 | 8558 | data.do_work = io_wq_submit_work; |
24369c2e | 8559 | |
d25e3a3d JA |
8560 | /* Do QD, or 4 * CPUS, whatever is smallest */ |
8561 | concurrency = min(ctx->sq_entries, 4 * num_online_cpus()); | |
24369c2e | 8562 | |
5aa75ed5 | 8563 | return io_wq_create(concurrency, &data); |
24369c2e PB |
8564 | } |
8565 | ||
5aa75ed5 JA |
8566 | static int io_uring_alloc_task_context(struct task_struct *task, |
8567 | struct io_ring_ctx *ctx) | |
0f212204 JA |
8568 | { |
8569 | struct io_uring_task *tctx; | |
d8a6df10 | 8570 | int ret; |
0f212204 | 8571 | |
09899b19 | 8572 | tctx = kzalloc(sizeof(*tctx), GFP_KERNEL); |
0f212204 JA |
8573 | if (unlikely(!tctx)) |
8574 | return -ENOMEM; | |
8575 | ||
d8a6df10 JA |
8576 | ret = percpu_counter_init(&tctx->inflight, 0, GFP_KERNEL); |
8577 | if (unlikely(ret)) { | |
8578 | kfree(tctx); | |
8579 | return ret; | |
8580 | } | |
8581 | ||
685fe7fe | 8582 | tctx->io_wq = io_init_wq_offload(ctx, task); |
5aa75ed5 JA |
8583 | if (IS_ERR(tctx->io_wq)) { |
8584 | ret = PTR_ERR(tctx->io_wq); | |
8585 | percpu_counter_destroy(&tctx->inflight); | |
8586 | kfree(tctx); | |
8587 | return ret; | |
8588 | } | |
8589 | ||
0f212204 JA |
8590 | xa_init(&tctx->xa); |
8591 | init_waitqueue_head(&tctx->wait); | |
fdaf083c | 8592 | atomic_set(&tctx->in_idle, 0); |
b303fe2e | 8593 | atomic_set(&tctx->inflight_tracked, 0); |
0f212204 | 8594 | task->io_uring = tctx; |
7cbf1722 JA |
8595 | spin_lock_init(&tctx->task_lock); |
8596 | INIT_WQ_LIST(&tctx->task_list); | |
7cbf1722 | 8597 | init_task_work(&tctx->task_work, tctx_task_work); |
0f212204 JA |
8598 | return 0; |
8599 | } | |
8600 | ||
8601 | void __io_uring_free(struct task_struct *tsk) | |
8602 | { | |
8603 | struct io_uring_task *tctx = tsk->io_uring; | |
8604 | ||
8605 | WARN_ON_ONCE(!xa_empty(&tctx->xa)); | |
ef8eaa4e | 8606 | WARN_ON_ONCE(tctx->io_wq); |
09899b19 | 8607 | WARN_ON_ONCE(tctx->cached_refs); |
ef8eaa4e | 8608 | |
d8a6df10 | 8609 | percpu_counter_destroy(&tctx->inflight); |
0f212204 JA |
8610 | kfree(tctx); |
8611 | tsk->io_uring = NULL; | |
8612 | } | |
8613 | ||
7e84e1c7 SG |
8614 | static int io_sq_offload_create(struct io_ring_ctx *ctx, |
8615 | struct io_uring_params *p) | |
2b188cc1 JA |
8616 | { |
8617 | int ret; | |
8618 | ||
d25e3a3d JA |
8619 | /* Retain compatibility with failing for an invalid attach attempt */ |
8620 | if ((ctx->flags & (IORING_SETUP_ATTACH_WQ | IORING_SETUP_SQPOLL)) == | |
8621 | IORING_SETUP_ATTACH_WQ) { | |
8622 | struct fd f; | |
8623 | ||
8624 | f = fdget(p->wq_fd); | |
8625 | if (!f.file) | |
8626 | return -ENXIO; | |
0cc936f7 JA |
8627 | if (f.file->f_op != &io_uring_fops) { |
8628 | fdput(f); | |
f2a48dd0 | 8629 | return -EINVAL; |
0cc936f7 JA |
8630 | } |
8631 | fdput(f); | |
d25e3a3d | 8632 | } |
6c271ce2 | 8633 | if (ctx->flags & IORING_SETUP_SQPOLL) { |
46fe18b1 | 8634 | struct task_struct *tsk; |
534ca6d6 | 8635 | struct io_sq_data *sqd; |
26984fbf | 8636 | bool attached; |
534ca6d6 | 8637 | |
26984fbf | 8638 | sqd = io_get_sq_data(p, &attached); |
534ca6d6 JA |
8639 | if (IS_ERR(sqd)) { |
8640 | ret = PTR_ERR(sqd); | |
8641 | goto err; | |
8642 | } | |
69fb2131 | 8643 | |
7c30f36a | 8644 | ctx->sq_creds = get_current_cred(); |
534ca6d6 | 8645 | ctx->sq_data = sqd; |
917257da JA |
8646 | ctx->sq_thread_idle = msecs_to_jiffies(p->sq_thread_idle); |
8647 | if (!ctx->sq_thread_idle) | |
8648 | ctx->sq_thread_idle = HZ; | |
8649 | ||
78d7f6ba | 8650 | io_sq_thread_park(sqd); |
de75a3d3 PB |
8651 | list_add(&ctx->sqd_list, &sqd->ctx_list); |
8652 | io_sqd_update_thread_idle(sqd); | |
26984fbf | 8653 | /* don't attach to a dying SQPOLL thread, would be racy */ |
f2a48dd0 | 8654 | ret = (attached && !sqd->thread) ? -ENXIO : 0; |
78d7f6ba PB |
8655 | io_sq_thread_unpark(sqd); |
8656 | ||
de75a3d3 PB |
8657 | if (ret < 0) |
8658 | goto err; | |
8659 | if (attached) | |
5aa75ed5 | 8660 | return 0; |
aa06165d | 8661 | |
6c271ce2 | 8662 | if (p->flags & IORING_SETUP_SQ_AFF) { |
44a9bd18 | 8663 | int cpu = p->sq_thread_cpu; |
6c271ce2 | 8664 | |
917257da | 8665 | ret = -EINVAL; |
f2a48dd0 | 8666 | if (cpu >= nr_cpu_ids || !cpu_online(cpu)) |
e8f98f24 | 8667 | goto err_sqpoll; |
37d1e2e3 | 8668 | sqd->sq_cpu = cpu; |
6c271ce2 | 8669 | } else { |
37d1e2e3 | 8670 | sqd->sq_cpu = -1; |
6c271ce2 | 8671 | } |
37d1e2e3 JA |
8672 | |
8673 | sqd->task_pid = current->pid; | |
5c2469e0 | 8674 | sqd->task_tgid = current->tgid; |
46fe18b1 JA |
8675 | tsk = create_io_thread(io_sq_thread, sqd, NUMA_NO_NODE); |
8676 | if (IS_ERR(tsk)) { | |
8677 | ret = PTR_ERR(tsk); | |
e8f98f24 | 8678 | goto err_sqpoll; |
6c271ce2 | 8679 | } |
97a73a0f | 8680 | |
46fe18b1 | 8681 | sqd->thread = tsk; |
97a73a0f | 8682 | ret = io_uring_alloc_task_context(tsk, ctx); |
46fe18b1 | 8683 | wake_up_new_task(tsk); |
0f212204 JA |
8684 | if (ret) |
8685 | goto err; | |
6c271ce2 JA |
8686 | } else if (p->flags & IORING_SETUP_SQ_AFF) { |
8687 | /* Can't have SQ_AFF without SQPOLL */ | |
8688 | ret = -EINVAL; | |
8689 | goto err; | |
8690 | } | |
8691 | ||
2b188cc1 | 8692 | return 0; |
f2a48dd0 PB |
8693 | err_sqpoll: |
8694 | complete(&ctx->sq_data->exited); | |
2b188cc1 | 8695 | err: |
37d1e2e3 | 8696 | io_sq_thread_finish(ctx); |
2b188cc1 JA |
8697 | return ret; |
8698 | } | |
8699 | ||
a087e2b5 BM |
8700 | static inline void __io_unaccount_mem(struct user_struct *user, |
8701 | unsigned long nr_pages) | |
2b188cc1 JA |
8702 | { |
8703 | atomic_long_sub(nr_pages, &user->locked_vm); | |
8704 | } | |
8705 | ||
a087e2b5 BM |
8706 | static inline int __io_account_mem(struct user_struct *user, |
8707 | unsigned long nr_pages) | |
2b188cc1 JA |
8708 | { |
8709 | unsigned long page_limit, cur_pages, new_pages; | |
8710 | ||
8711 | /* Don't allow more pages than we can safely lock */ | |
8712 | page_limit = rlimit(RLIMIT_MEMLOCK) >> PAGE_SHIFT; | |
8713 | ||
8714 | do { | |
8715 | cur_pages = atomic_long_read(&user->locked_vm); | |
8716 | new_pages = cur_pages + nr_pages; | |
8717 | if (new_pages > page_limit) | |
8718 | return -ENOMEM; | |
8719 | } while (atomic_long_cmpxchg(&user->locked_vm, cur_pages, | |
8720 | new_pages) != cur_pages); | |
8721 | ||
8722 | return 0; | |
8723 | } | |
8724 | ||
26bfa89e | 8725 | static void io_unaccount_mem(struct io_ring_ctx *ctx, unsigned long nr_pages) |
a087e2b5 | 8726 | { |
62e398be | 8727 | if (ctx->user) |
a087e2b5 | 8728 | __io_unaccount_mem(ctx->user, nr_pages); |
30975825 | 8729 | |
26bfa89e JA |
8730 | if (ctx->mm_account) |
8731 | atomic64_sub(nr_pages, &ctx->mm_account->pinned_vm); | |
a087e2b5 BM |
8732 | } |
8733 | ||
26bfa89e | 8734 | static int io_account_mem(struct io_ring_ctx *ctx, unsigned long nr_pages) |
a087e2b5 | 8735 | { |
30975825 BM |
8736 | int ret; |
8737 | ||
62e398be | 8738 | if (ctx->user) { |
30975825 BM |
8739 | ret = __io_account_mem(ctx->user, nr_pages); |
8740 | if (ret) | |
8741 | return ret; | |
8742 | } | |
8743 | ||
26bfa89e JA |
8744 | if (ctx->mm_account) |
8745 | atomic64_add(nr_pages, &ctx->mm_account->pinned_vm); | |
a087e2b5 BM |
8746 | |
8747 | return 0; | |
8748 | } | |
8749 | ||
2b188cc1 JA |
8750 | static void io_mem_free(void *ptr) |
8751 | { | |
52e04ef4 MR |
8752 | struct page *page; |
8753 | ||
8754 | if (!ptr) | |
8755 | return; | |
2b188cc1 | 8756 | |
52e04ef4 | 8757 | page = virt_to_head_page(ptr); |
2b188cc1 JA |
8758 | if (put_page_testzero(page)) |
8759 | free_compound_page(page); | |
8760 | } | |
8761 | ||
8762 | static void *io_mem_alloc(size_t size) | |
8763 | { | |
8764 | gfp_t gfp_flags = GFP_KERNEL | __GFP_ZERO | __GFP_NOWARN | __GFP_COMP | | |
26bfa89e | 8765 | __GFP_NORETRY | __GFP_ACCOUNT; |
2b188cc1 JA |
8766 | |
8767 | return (void *) __get_free_pages(gfp_flags, get_order(size)); | |
8768 | } | |
8769 | ||
75b28aff HV |
8770 | static unsigned long rings_size(unsigned sq_entries, unsigned cq_entries, |
8771 | size_t *sq_offset) | |
8772 | { | |
8773 | struct io_rings *rings; | |
8774 | size_t off, sq_array_size; | |
8775 | ||
8776 | off = struct_size(rings, cqes, cq_entries); | |
8777 | if (off == SIZE_MAX) | |
8778 | return SIZE_MAX; | |
8779 | ||
8780 | #ifdef CONFIG_SMP | |
8781 | off = ALIGN(off, SMP_CACHE_BYTES); | |
8782 | if (off == 0) | |
8783 | return SIZE_MAX; | |
8784 | #endif | |
8785 | ||
b36200f5 DV |
8786 | if (sq_offset) |
8787 | *sq_offset = off; | |
8788 | ||
75b28aff HV |
8789 | sq_array_size = array_size(sizeof(u32), sq_entries); |
8790 | if (sq_array_size == SIZE_MAX) | |
8791 | return SIZE_MAX; | |
8792 | ||
8793 | if (check_add_overflow(off, sq_array_size, &off)) | |
8794 | return SIZE_MAX; | |
8795 | ||
75b28aff HV |
8796 | return off; |
8797 | } | |
8798 | ||
41edf1a5 | 8799 | static void io_buffer_unmap(struct io_ring_ctx *ctx, struct io_mapped_ubuf **slot) |
7f61a1e9 | 8800 | { |
41edf1a5 | 8801 | struct io_mapped_ubuf *imu = *slot; |
7f61a1e9 PB |
8802 | unsigned int i; |
8803 | ||
6224843d PB |
8804 | if (imu != ctx->dummy_ubuf) { |
8805 | for (i = 0; i < imu->nr_bvecs; i++) | |
8806 | unpin_user_page(imu->bvec[i].bv_page); | |
8807 | if (imu->acct_pages) | |
8808 | io_unaccount_mem(ctx, imu->acct_pages); | |
8809 | kvfree(imu); | |
8810 | } | |
41edf1a5 | 8811 | *slot = NULL; |
7f61a1e9 PB |
8812 | } |
8813 | ||
bd54b6fe | 8814 | static void io_rsrc_buf_put(struct io_ring_ctx *ctx, struct io_rsrc_put *prsrc) |
edafccee | 8815 | { |
634d00df PB |
8816 | io_buffer_unmap(ctx, &prsrc->buf); |
8817 | prsrc->buf = NULL; | |
bd54b6fe | 8818 | } |
edafccee | 8819 | |
bd54b6fe BM |
8820 | static void __io_sqe_buffers_unregister(struct io_ring_ctx *ctx) |
8821 | { | |
8822 | unsigned int i; | |
edafccee | 8823 | |
7f61a1e9 PB |
8824 | for (i = 0; i < ctx->nr_user_bufs; i++) |
8825 | io_buffer_unmap(ctx, &ctx->user_bufs[i]); | |
edafccee | 8826 | kfree(ctx->user_bufs); |
bb6659cc | 8827 | io_rsrc_data_free(ctx->buf_data); |
edafccee | 8828 | ctx->user_bufs = NULL; |
bd54b6fe | 8829 | ctx->buf_data = NULL; |
edafccee | 8830 | ctx->nr_user_bufs = 0; |
bd54b6fe BM |
8831 | } |
8832 | ||
0a96bbe4 | 8833 | static int io_sqe_buffers_unregister(struct io_ring_ctx *ctx) |
edafccee | 8834 | { |
bd54b6fe | 8835 | int ret; |
edafccee | 8836 | |
bd54b6fe | 8837 | if (!ctx->buf_data) |
edafccee JA |
8838 | return -ENXIO; |
8839 | ||
bd54b6fe BM |
8840 | ret = io_rsrc_ref_quiesce(ctx->buf_data, ctx); |
8841 | if (!ret) | |
8842 | __io_sqe_buffers_unregister(ctx); | |
8843 | return ret; | |
edafccee JA |
8844 | } |
8845 | ||
8846 | static int io_copy_iov(struct io_ring_ctx *ctx, struct iovec *dst, | |
8847 | void __user *arg, unsigned index) | |
8848 | { | |
8849 | struct iovec __user *src; | |
8850 | ||
8851 | #ifdef CONFIG_COMPAT | |
8852 | if (ctx->compat) { | |
8853 | struct compat_iovec __user *ciovs; | |
8854 | struct compat_iovec ciov; | |
8855 | ||
8856 | ciovs = (struct compat_iovec __user *) arg; | |
8857 | if (copy_from_user(&ciov, &ciovs[index], sizeof(ciov))) | |
8858 | return -EFAULT; | |
8859 | ||
d55e5f5b | 8860 | dst->iov_base = u64_to_user_ptr((u64)ciov.iov_base); |
edafccee JA |
8861 | dst->iov_len = ciov.iov_len; |
8862 | return 0; | |
8863 | } | |
8864 | #endif | |
8865 | src = (struct iovec __user *) arg; | |
8866 | if (copy_from_user(dst, &src[index], sizeof(*dst))) | |
8867 | return -EFAULT; | |
8868 | return 0; | |
8869 | } | |
8870 | ||
de293938 JA |
8871 | /* |
8872 | * Not super efficient, but this is just a registration time. And we do cache | |
8873 | * the last compound head, so generally we'll only do a full search if we don't | |
8874 | * match that one. | |
8875 | * | |
8876 | * We check if the given compound head page has already been accounted, to | |
8877 | * avoid double accounting it. This allows us to account the full size of the | |
8878 | * page, not just the constituent pages of a huge page. | |
8879 | */ | |
8880 | static bool headpage_already_acct(struct io_ring_ctx *ctx, struct page **pages, | |
8881 | int nr_pages, struct page *hpage) | |
8882 | { | |
8883 | int i, j; | |
8884 | ||
8885 | /* check current page array */ | |
8886 | for (i = 0; i < nr_pages; i++) { | |
8887 | if (!PageCompound(pages[i])) | |
8888 | continue; | |
8889 | if (compound_head(pages[i]) == hpage) | |
8890 | return true; | |
8891 | } | |
8892 | ||
8893 | /* check previously registered pages */ | |
8894 | for (i = 0; i < ctx->nr_user_bufs; i++) { | |
41edf1a5 | 8895 | struct io_mapped_ubuf *imu = ctx->user_bufs[i]; |
de293938 JA |
8896 | |
8897 | for (j = 0; j < imu->nr_bvecs; j++) { | |
8898 | if (!PageCompound(imu->bvec[j].bv_page)) | |
8899 | continue; | |
8900 | if (compound_head(imu->bvec[j].bv_page) == hpage) | |
8901 | return true; | |
8902 | } | |
8903 | } | |
8904 | ||
8905 | return false; | |
8906 | } | |
8907 | ||
8908 | static int io_buffer_account_pin(struct io_ring_ctx *ctx, struct page **pages, | |
8909 | int nr_pages, struct io_mapped_ubuf *imu, | |
8910 | struct page **last_hpage) | |
8911 | { | |
8912 | int i, ret; | |
8913 | ||
216e5835 | 8914 | imu->acct_pages = 0; |
de293938 JA |
8915 | for (i = 0; i < nr_pages; i++) { |
8916 | if (!PageCompound(pages[i])) { | |
8917 | imu->acct_pages++; | |
8918 | } else { | |
8919 | struct page *hpage; | |
8920 | ||
8921 | hpage = compound_head(pages[i]); | |
8922 | if (hpage == *last_hpage) | |
8923 | continue; | |
8924 | *last_hpage = hpage; | |
8925 | if (headpage_already_acct(ctx, pages, i, hpage)) | |
8926 | continue; | |
8927 | imu->acct_pages += page_size(hpage) >> PAGE_SHIFT; | |
8928 | } | |
8929 | } | |
8930 | ||
8931 | if (!imu->acct_pages) | |
8932 | return 0; | |
8933 | ||
26bfa89e | 8934 | ret = io_account_mem(ctx, imu->acct_pages); |
de293938 JA |
8935 | if (ret) |
8936 | imu->acct_pages = 0; | |
8937 | return ret; | |
8938 | } | |
8939 | ||
0a96bbe4 | 8940 | static int io_sqe_buffer_register(struct io_ring_ctx *ctx, struct iovec *iov, |
41edf1a5 | 8941 | struct io_mapped_ubuf **pimu, |
0a96bbe4 | 8942 | struct page **last_hpage) |
edafccee | 8943 | { |
41edf1a5 | 8944 | struct io_mapped_ubuf *imu = NULL; |
edafccee JA |
8945 | struct vm_area_struct **vmas = NULL; |
8946 | struct page **pages = NULL; | |
0a96bbe4 BM |
8947 | unsigned long off, start, end, ubuf; |
8948 | size_t size; | |
8949 | int ret, pret, nr_pages, i; | |
8950 | ||
6224843d PB |
8951 | if (!iov->iov_base) { |
8952 | *pimu = ctx->dummy_ubuf; | |
8953 | return 0; | |
8954 | } | |
8955 | ||
0a96bbe4 BM |
8956 | ubuf = (unsigned long) iov->iov_base; |
8957 | end = (ubuf + iov->iov_len + PAGE_SIZE - 1) >> PAGE_SHIFT; | |
8958 | start = ubuf >> PAGE_SHIFT; | |
8959 | nr_pages = end - start; | |
8960 | ||
41edf1a5 | 8961 | *pimu = NULL; |
0a96bbe4 BM |
8962 | ret = -ENOMEM; |
8963 | ||
8964 | pages = kvmalloc_array(nr_pages, sizeof(struct page *), GFP_KERNEL); | |
8965 | if (!pages) | |
8966 | goto done; | |
8967 | ||
8968 | vmas = kvmalloc_array(nr_pages, sizeof(struct vm_area_struct *), | |
8969 | GFP_KERNEL); | |
8970 | if (!vmas) | |
8971 | goto done; | |
edafccee | 8972 | |
41edf1a5 | 8973 | imu = kvmalloc(struct_size(imu, bvec, nr_pages), GFP_KERNEL); |
a2b4198c | 8974 | if (!imu) |
0a96bbe4 BM |
8975 | goto done; |
8976 | ||
8977 | ret = 0; | |
8978 | mmap_read_lock(current->mm); | |
8979 | pret = pin_user_pages(ubuf, nr_pages, FOLL_WRITE | FOLL_LONGTERM, | |
8980 | pages, vmas); | |
8981 | if (pret == nr_pages) { | |
8982 | /* don't support file backed memory */ | |
8983 | for (i = 0; i < nr_pages; i++) { | |
8984 | struct vm_area_struct *vma = vmas[i]; | |
8985 | ||
40dad765 PB |
8986 | if (vma_is_shmem(vma)) |
8987 | continue; | |
0a96bbe4 BM |
8988 | if (vma->vm_file && |
8989 | !is_file_hugepages(vma->vm_file)) { | |
8990 | ret = -EOPNOTSUPP; | |
8991 | break; | |
8992 | } | |
8993 | } | |
8994 | } else { | |
8995 | ret = pret < 0 ? pret : -EFAULT; | |
8996 | } | |
8997 | mmap_read_unlock(current->mm); | |
8998 | if (ret) { | |
8999 | /* | |
9000 | * if we did partial map, or found file backed vmas, | |
9001 | * release any pages we did get | |
9002 | */ | |
9003 | if (pret > 0) | |
9004 | unpin_user_pages(pages, pret); | |
0a96bbe4 BM |
9005 | goto done; |
9006 | } | |
9007 | ||
9008 | ret = io_buffer_account_pin(ctx, pages, pret, imu, last_hpage); | |
9009 | if (ret) { | |
9010 | unpin_user_pages(pages, pret); | |
0a96bbe4 BM |
9011 | goto done; |
9012 | } | |
9013 | ||
9014 | off = ubuf & ~PAGE_MASK; | |
9015 | size = iov->iov_len; | |
9016 | for (i = 0; i < nr_pages; i++) { | |
9017 | size_t vec_len; | |
9018 | ||
9019 | vec_len = min_t(size_t, size, PAGE_SIZE - off); | |
9020 | imu->bvec[i].bv_page = pages[i]; | |
9021 | imu->bvec[i].bv_len = vec_len; | |
9022 | imu->bvec[i].bv_offset = off; | |
9023 | off = 0; | |
9024 | size -= vec_len; | |
9025 | } | |
9026 | /* store original address for later verification */ | |
9027 | imu->ubuf = ubuf; | |
4751f53d | 9028 | imu->ubuf_end = ubuf + iov->iov_len; |
0a96bbe4 | 9029 | imu->nr_bvecs = nr_pages; |
41edf1a5 | 9030 | *pimu = imu; |
0a96bbe4 BM |
9031 | ret = 0; |
9032 | done: | |
41edf1a5 PB |
9033 | if (ret) |
9034 | kvfree(imu); | |
0a96bbe4 BM |
9035 | kvfree(pages); |
9036 | kvfree(vmas); | |
9037 | return ret; | |
9038 | } | |
9039 | ||
2b358604 | 9040 | static int io_buffers_map_alloc(struct io_ring_ctx *ctx, unsigned int nr_args) |
0a96bbe4 | 9041 | { |
87094465 PB |
9042 | ctx->user_bufs = kcalloc(nr_args, sizeof(*ctx->user_bufs), GFP_KERNEL); |
9043 | return ctx->user_bufs ? 0 : -ENOMEM; | |
2b358604 | 9044 | } |
edafccee | 9045 | |
2b358604 BM |
9046 | static int io_buffer_validate(struct iovec *iov) |
9047 | { | |
50e96989 PB |
9048 | unsigned long tmp, acct_len = iov->iov_len + (PAGE_SIZE - 1); |
9049 | ||
2b358604 BM |
9050 | /* |
9051 | * Don't impose further limits on the size and buffer | |
9052 | * constraints here, we'll -EINVAL later when IO is | |
9053 | * submitted if they are wrong. | |
9054 | */ | |
6224843d PB |
9055 | if (!iov->iov_base) |
9056 | return iov->iov_len ? -EFAULT : 0; | |
9057 | if (!iov->iov_len) | |
2b358604 | 9058 | return -EFAULT; |
edafccee | 9059 | |
2b358604 BM |
9060 | /* arbitrary limit, but we need something */ |
9061 | if (iov->iov_len > SZ_1G) | |
9062 | return -EFAULT; | |
edafccee | 9063 | |
50e96989 PB |
9064 | if (check_add_overflow((unsigned long)iov->iov_base, acct_len, &tmp)) |
9065 | return -EOVERFLOW; | |
9066 | ||
2b358604 BM |
9067 | return 0; |
9068 | } | |
edafccee | 9069 | |
2b358604 | 9070 | static int io_sqe_buffers_register(struct io_ring_ctx *ctx, void __user *arg, |
634d00df | 9071 | unsigned int nr_args, u64 __user *tags) |
2b358604 | 9072 | { |
bd54b6fe BM |
9073 | struct page *last_hpage = NULL; |
9074 | struct io_rsrc_data *data; | |
2b358604 BM |
9075 | int i, ret; |
9076 | struct iovec iov; | |
edafccee | 9077 | |
87094465 PB |
9078 | if (ctx->user_bufs) |
9079 | return -EBUSY; | |
489809e2 | 9080 | if (!nr_args || nr_args > IORING_MAX_REG_BUFFERS) |
87094465 | 9081 | return -EINVAL; |
bd54b6fe | 9082 | ret = io_rsrc_node_switch_start(ctx); |
2b358604 BM |
9083 | if (ret) |
9084 | return ret; | |
d878c816 PB |
9085 | ret = io_rsrc_data_alloc(ctx, io_rsrc_buf_put, tags, nr_args, &data); |
9086 | if (ret) | |
9087 | return ret; | |
bd54b6fe BM |
9088 | ret = io_buffers_map_alloc(ctx, nr_args); |
9089 | if (ret) { | |
bb6659cc | 9090 | io_rsrc_data_free(data); |
bd54b6fe BM |
9091 | return ret; |
9092 | } | |
edafccee | 9093 | |
87094465 | 9094 | for (i = 0; i < nr_args; i++, ctx->nr_user_bufs++) { |
edafccee JA |
9095 | ret = io_copy_iov(ctx, &iov, arg, i); |
9096 | if (ret) | |
0a96bbe4 | 9097 | break; |
2b358604 BM |
9098 | ret = io_buffer_validate(&iov); |
9099 | if (ret) | |
0a96bbe4 | 9100 | break; |
2d091d62 | 9101 | if (!iov.iov_base && *io_get_tag_slot(data, i)) { |
cf3770e7 CIK |
9102 | ret = -EINVAL; |
9103 | break; | |
9104 | } | |
edafccee | 9105 | |
41edf1a5 PB |
9106 | ret = io_sqe_buffer_register(ctx, &iov, &ctx->user_bufs[i], |
9107 | &last_hpage); | |
0a96bbe4 BM |
9108 | if (ret) |
9109 | break; | |
edafccee | 9110 | } |
0a96bbe4 | 9111 | |
bd54b6fe | 9112 | WARN_ON_ONCE(ctx->buf_data); |
0a96bbe4 | 9113 | |
bd54b6fe BM |
9114 | ctx->buf_data = data; |
9115 | if (ret) | |
9116 | __io_sqe_buffers_unregister(ctx); | |
9117 | else | |
9118 | io_rsrc_node_switch(ctx, NULL); | |
edafccee JA |
9119 | return ret; |
9120 | } | |
9121 | ||
634d00df PB |
9122 | static int __io_sqe_buffers_update(struct io_ring_ctx *ctx, |
9123 | struct io_uring_rsrc_update2 *up, | |
9124 | unsigned int nr_args) | |
9125 | { | |
9126 | u64 __user *tags = u64_to_user_ptr(up->tags); | |
9127 | struct iovec iov, __user *iovs = u64_to_user_ptr(up->data); | |
634d00df PB |
9128 | struct page *last_hpage = NULL; |
9129 | bool needs_switch = false; | |
9130 | __u32 done; | |
9131 | int i, err; | |
9132 | ||
9133 | if (!ctx->buf_data) | |
9134 | return -ENXIO; | |
9135 | if (up->offset + nr_args > ctx->nr_user_bufs) | |
9136 | return -EINVAL; | |
9137 | ||
9138 | for (done = 0; done < nr_args; done++) { | |
0b8c0e7c PB |
9139 | struct io_mapped_ubuf *imu; |
9140 | int offset = up->offset + done; | |
634d00df PB |
9141 | u64 tag = 0; |
9142 | ||
9143 | err = io_copy_iov(ctx, &iov, iovs, done); | |
9144 | if (err) | |
9145 | break; | |
9146 | if (tags && copy_from_user(&tag, &tags[done], sizeof(tag))) { | |
9147 | err = -EFAULT; | |
9148 | break; | |
9149 | } | |
0b8c0e7c PB |
9150 | err = io_buffer_validate(&iov); |
9151 | if (err) | |
9152 | break; | |
cf3770e7 CIK |
9153 | if (!iov.iov_base && tag) { |
9154 | err = -EINVAL; | |
9155 | break; | |
9156 | } | |
0b8c0e7c PB |
9157 | err = io_sqe_buffer_register(ctx, &iov, &imu, &last_hpage); |
9158 | if (err) | |
9159 | break; | |
634d00df | 9160 | |
0b8c0e7c | 9161 | i = array_index_nospec(offset, ctx->nr_user_bufs); |
6224843d | 9162 | if (ctx->user_bufs[i] != ctx->dummy_ubuf) { |
0b8c0e7c PB |
9163 | err = io_queue_rsrc_removal(ctx->buf_data, offset, |
9164 | ctx->rsrc_node, ctx->user_bufs[i]); | |
9165 | if (unlikely(err)) { | |
9166 | io_buffer_unmap(ctx, &imu); | |
634d00df | 9167 | break; |
0b8c0e7c | 9168 | } |
634d00df PB |
9169 | ctx->user_bufs[i] = NULL; |
9170 | needs_switch = true; | |
9171 | } | |
9172 | ||
0b8c0e7c | 9173 | ctx->user_bufs[i] = imu; |
2d091d62 | 9174 | *io_get_tag_slot(ctx->buf_data, offset) = tag; |
634d00df PB |
9175 | } |
9176 | ||
9177 | if (needs_switch) | |
9178 | io_rsrc_node_switch(ctx, ctx->buf_data); | |
9179 | return done ? done : err; | |
9180 | } | |
9181 | ||
9b402849 JA |
9182 | static int io_eventfd_register(struct io_ring_ctx *ctx, void __user *arg) |
9183 | { | |
9184 | __s32 __user *fds = arg; | |
9185 | int fd; | |
9186 | ||
9187 | if (ctx->cq_ev_fd) | |
9188 | return -EBUSY; | |
9189 | ||
9190 | if (copy_from_user(&fd, fds, sizeof(*fds))) | |
9191 | return -EFAULT; | |
9192 | ||
9193 | ctx->cq_ev_fd = eventfd_ctx_fdget(fd); | |
9194 | if (IS_ERR(ctx->cq_ev_fd)) { | |
9195 | int ret = PTR_ERR(ctx->cq_ev_fd); | |
fe7e3257 | 9196 | |
9b402849 JA |
9197 | ctx->cq_ev_fd = NULL; |
9198 | return ret; | |
9199 | } | |
9200 | ||
9201 | return 0; | |
9202 | } | |
9203 | ||
9204 | static int io_eventfd_unregister(struct io_ring_ctx *ctx) | |
9205 | { | |
9206 | if (ctx->cq_ev_fd) { | |
9207 | eventfd_ctx_put(ctx->cq_ev_fd); | |
9208 | ctx->cq_ev_fd = NULL; | |
9209 | return 0; | |
9210 | } | |
9211 | ||
9212 | return -ENXIO; | |
9213 | } | |
9214 | ||
5a2e745d JA |
9215 | static void io_destroy_buffers(struct io_ring_ctx *ctx) |
9216 | { | |
9e15c3a0 JA |
9217 | struct io_buffer *buf; |
9218 | unsigned long index; | |
9219 | ||
8bab4c09 | 9220 | xa_for_each(&ctx->io_buffers, index, buf) { |
9e15c3a0 | 9221 | __io_remove_buffers(ctx, buf, index, -1U); |
8bab4c09 JA |
9222 | cond_resched(); |
9223 | } | |
5a2e745d JA |
9224 | } |
9225 | ||
7255834e | 9226 | static void io_req_cache_free(struct list_head *list) |
1b4c351f | 9227 | { |
68e68ee6 | 9228 | struct io_kiocb *req, *nxt; |
1b4c351f | 9229 | |
bb943b82 PB |
9230 | list_for_each_entry_safe(req, nxt, list, inflight_entry) { |
9231 | list_del(&req->inflight_entry); | |
1b4c351f JA |
9232 | kmem_cache_free(req_cachep, req); |
9233 | } | |
9234 | } | |
9235 | ||
4010fec4 | 9236 | static void io_req_caches_free(struct io_ring_ctx *ctx) |
2b188cc1 | 9237 | { |
cd0ca2e0 | 9238 | struct io_submit_state *state = &ctx->submit_state; |
bf019da7 | 9239 | |
9a4fdbd8 JA |
9240 | mutex_lock(&ctx->uring_lock); |
9241 | ||
cd0ca2e0 PB |
9242 | if (state->free_reqs) { |
9243 | kmem_cache_free_bulk(req_cachep, state->free_reqs, state->reqs); | |
9244 | state->free_reqs = 0; | |
8e5c66c4 | 9245 | } |
9a4fdbd8 | 9246 | |
cd0ca2e0 PB |
9247 | io_flush_cached_locked_reqs(ctx, state); |
9248 | io_req_cache_free(&state->free_list); | |
9a4fdbd8 JA |
9249 | mutex_unlock(&ctx->uring_lock); |
9250 | } | |
9251 | ||
43597aac | 9252 | static void io_wait_rsrc_data(struct io_rsrc_data *data) |
2b188cc1 | 9253 | { |
43597aac | 9254 | if (data && !atomic_dec_and_test(&data->refs)) |
bd54b6fe | 9255 | wait_for_completion(&data->done); |
bd54b6fe | 9256 | } |
04fc6c80 | 9257 | |
2b188cc1 JA |
9258 | static void io_ring_ctx_free(struct io_ring_ctx *ctx) |
9259 | { | |
37d1e2e3 | 9260 | io_sq_thread_finish(ctx); |
2aede0e4 | 9261 | |
37d1e2e3 | 9262 | if (ctx->mm_account) { |
2aede0e4 JA |
9263 | mmdrop(ctx->mm_account); |
9264 | ctx->mm_account = NULL; | |
30975825 | 9265 | } |
def596e9 | 9266 | |
43597aac PB |
9267 | /* __io_rsrc_put_work() may need uring_lock to progress, wait w/o it */ |
9268 | io_wait_rsrc_data(ctx->buf_data); | |
9269 | io_wait_rsrc_data(ctx->file_data); | |
9270 | ||
8bad28d8 | 9271 | mutex_lock(&ctx->uring_lock); |
43597aac | 9272 | if (ctx->buf_data) |
bd54b6fe | 9273 | __io_sqe_buffers_unregister(ctx); |
43597aac | 9274 | if (ctx->file_data) |
08480400 | 9275 | __io_sqe_files_unregister(ctx); |
c4ea060e PB |
9276 | if (ctx->rings) |
9277 | __io_cqring_overflow_flush(ctx, true); | |
8bad28d8 | 9278 | mutex_unlock(&ctx->uring_lock); |
9b402849 | 9279 | io_eventfd_unregister(ctx); |
5a2e745d | 9280 | io_destroy_buffers(ctx); |
07db298a PB |
9281 | if (ctx->sq_creds) |
9282 | put_cred(ctx->sq_creds); | |
def596e9 | 9283 | |
a7f0ed5a PB |
9284 | /* there are no registered resources left, nobody uses it */ |
9285 | if (ctx->rsrc_node) | |
9286 | io_rsrc_node_destroy(ctx->rsrc_node); | |
8dd03afe | 9287 | if (ctx->rsrc_backup_node) |
b895c9a6 | 9288 | io_rsrc_node_destroy(ctx->rsrc_backup_node); |
a7f0ed5a PB |
9289 | flush_delayed_work(&ctx->rsrc_put_work); |
9290 | ||
9291 | WARN_ON_ONCE(!list_empty(&ctx->rsrc_ref_list)); | |
9292 | WARN_ON_ONCE(!llist_empty(&ctx->rsrc_put_llist)); | |
def596e9 | 9293 | |
2b188cc1 | 9294 | #if defined(CONFIG_UNIX) |
355e8d26 EB |
9295 | if (ctx->ring_sock) { |
9296 | ctx->ring_sock->file = NULL; /* so that iput() is called */ | |
2b188cc1 | 9297 | sock_release(ctx->ring_sock); |
355e8d26 | 9298 | } |
2b188cc1 | 9299 | #endif |
ef9dd637 | 9300 | WARN_ON_ONCE(!list_empty(&ctx->ltimeout_list)); |
2b188cc1 | 9301 | |
75b28aff | 9302 | io_mem_free(ctx->rings); |
2b188cc1 | 9303 | io_mem_free(ctx->sq_sqes); |
2b188cc1 JA |
9304 | |
9305 | percpu_ref_exit(&ctx->refs); | |
2b188cc1 | 9306 | free_uid(ctx->user); |
4010fec4 | 9307 | io_req_caches_free(ctx); |
e941894e JA |
9308 | if (ctx->hash_map) |
9309 | io_wq_put_hash(ctx->hash_map); | |
78076bb6 | 9310 | kfree(ctx->cancel_hash); |
6224843d | 9311 | kfree(ctx->dummy_ubuf); |
2b188cc1 JA |
9312 | kfree(ctx); |
9313 | } | |
9314 | ||
9315 | static __poll_t io_uring_poll(struct file *file, poll_table *wait) | |
9316 | { | |
9317 | struct io_ring_ctx *ctx = file->private_data; | |
9318 | __poll_t mask = 0; | |
9319 | ||
311997b3 | 9320 | poll_wait(file, &ctx->poll_wait, wait); |
4f7067c3 SB |
9321 | /* |
9322 | * synchronizes with barrier from wq_has_sleeper call in | |
9323 | * io_commit_cqring | |
9324 | */ | |
2b188cc1 | 9325 | smp_rmb(); |
90554200 | 9326 | if (!io_sqring_full(ctx)) |
2b188cc1 | 9327 | mask |= EPOLLOUT | EPOLLWRNORM; |
ed670c3f HX |
9328 | |
9329 | /* | |
9330 | * Don't flush cqring overflow list here, just do a simple check. | |
9331 | * Otherwise there could possible be ABBA deadlock: | |
9332 | * CPU0 CPU1 | |
9333 | * ---- ---- | |
9334 | * lock(&ctx->uring_lock); | |
9335 | * lock(&ep->mtx); | |
9336 | * lock(&ctx->uring_lock); | |
9337 | * lock(&ep->mtx); | |
9338 | * | |
9339 | * Users may get EPOLLIN meanwhile seeing nothing in cqring, this | |
9340 | * pushs them to do the flush. | |
9341 | */ | |
5ed7a37d | 9342 | if (io_cqring_events(ctx) || test_bit(0, &ctx->check_cq_overflow)) |
2b188cc1 JA |
9343 | mask |= EPOLLIN | EPOLLRDNORM; |
9344 | ||
9345 | return mask; | |
9346 | } | |
9347 | ||
9348 | static int io_uring_fasync(int fd, struct file *file, int on) | |
9349 | { | |
9350 | struct io_ring_ctx *ctx = file->private_data; | |
9351 | ||
9352 | return fasync_helper(fd, file, on, &ctx->cq_fasync); | |
9353 | } | |
9354 | ||
0bead8cd | 9355 | static int io_unregister_personality(struct io_ring_ctx *ctx, unsigned id) |
071698e1 | 9356 | { |
4379bf8b | 9357 | const struct cred *creds; |
071698e1 | 9358 | |
61cf9370 | 9359 | creds = xa_erase(&ctx->personalities, id); |
4379bf8b JA |
9360 | if (creds) { |
9361 | put_cred(creds); | |
0bead8cd | 9362 | return 0; |
1e6fa521 | 9363 | } |
0bead8cd YD |
9364 | |
9365 | return -EINVAL; | |
9366 | } | |
9367 | ||
d56d938b PB |
9368 | struct io_tctx_exit { |
9369 | struct callback_head task_work; | |
9370 | struct completion completion; | |
baf186c4 | 9371 | struct io_ring_ctx *ctx; |
d56d938b PB |
9372 | }; |
9373 | ||
9374 | static void io_tctx_exit_cb(struct callback_head *cb) | |
9375 | { | |
9376 | struct io_uring_task *tctx = current->io_uring; | |
9377 | struct io_tctx_exit *work; | |
9378 | ||
9379 | work = container_of(cb, struct io_tctx_exit, task_work); | |
9380 | /* | |
9381 | * When @in_idle, we're in cancellation and it's racy to remove the | |
9382 | * node. It'll be removed by the end of cancellation, just ignore it. | |
9383 | */ | |
9384 | if (!atomic_read(&tctx->in_idle)) | |
eef51daa | 9385 | io_uring_del_tctx_node((unsigned long)work->ctx); |
d56d938b PB |
9386 | complete(&work->completion); |
9387 | } | |
9388 | ||
28090c13 PB |
9389 | static bool io_cancel_ctx_cb(struct io_wq_work *work, void *data) |
9390 | { | |
9391 | struct io_kiocb *req = container_of(work, struct io_kiocb, work); | |
9392 | ||
9393 | return req->ctx == data; | |
9394 | } | |
9395 | ||
85faa7b8 JA |
9396 | static void io_ring_exit_work(struct work_struct *work) |
9397 | { | |
d56d938b | 9398 | struct io_ring_ctx *ctx = container_of(work, struct io_ring_ctx, exit_work); |
b5bb3a24 | 9399 | unsigned long timeout = jiffies + HZ * 60 * 5; |
58d3be2c | 9400 | unsigned long interval = HZ / 20; |
d56d938b PB |
9401 | struct io_tctx_exit exit; |
9402 | struct io_tctx_node *node; | |
9403 | int ret; | |
85faa7b8 | 9404 | |
56952e91 JA |
9405 | /* |
9406 | * If we're doing polled IO and end up having requests being | |
9407 | * submitted async (out-of-line), then completions can come in while | |
9408 | * we're waiting for refs to drop. We need to reap these manually, | |
9409 | * as nobody else will be looking for them. | |
9410 | */ | |
b2edc0a7 | 9411 | do { |
3dd0c97a | 9412 | io_uring_try_cancel_requests(ctx, NULL, true); |
28090c13 PB |
9413 | if (ctx->sq_data) { |
9414 | struct io_sq_data *sqd = ctx->sq_data; | |
9415 | struct task_struct *tsk; | |
9416 | ||
9417 | io_sq_thread_park(sqd); | |
9418 | tsk = sqd->thread; | |
9419 | if (tsk && tsk->io_uring && tsk->io_uring->io_wq) | |
9420 | io_wq_cancel_cb(tsk->io_uring->io_wq, | |
9421 | io_cancel_ctx_cb, ctx, true); | |
9422 | io_sq_thread_unpark(sqd); | |
9423 | } | |
b5bb3a24 | 9424 | |
58d3be2c PB |
9425 | if (WARN_ON_ONCE(time_after(jiffies, timeout))) { |
9426 | /* there is little hope left, don't run it too often */ | |
9427 | interval = HZ * 60; | |
9428 | } | |
9429 | } while (!wait_for_completion_timeout(&ctx->ref_comp, interval)); | |
d56d938b | 9430 | |
7f00651a PB |
9431 | init_completion(&exit.completion); |
9432 | init_task_work(&exit.task_work, io_tctx_exit_cb); | |
9433 | exit.ctx = ctx; | |
89b5066e PB |
9434 | /* |
9435 | * Some may use context even when all refs and requests have been put, | |
9436 | * and they are free to do so while still holding uring_lock or | |
5b0a6acc | 9437 | * completion_lock, see io_req_task_submit(). Apart from other work, |
89b5066e PB |
9438 | * this lock/unlock section also waits them to finish. |
9439 | */ | |
d56d938b PB |
9440 | mutex_lock(&ctx->uring_lock); |
9441 | while (!list_empty(&ctx->tctx_list)) { | |
b5bb3a24 PB |
9442 | WARN_ON_ONCE(time_after(jiffies, timeout)); |
9443 | ||
d56d938b PB |
9444 | node = list_first_entry(&ctx->tctx_list, struct io_tctx_node, |
9445 | ctx_node); | |
7f00651a PB |
9446 | /* don't spin on a single task if cancellation failed */ |
9447 | list_rotate_left(&ctx->tctx_list); | |
d56d938b PB |
9448 | ret = task_work_add(node->task, &exit.task_work, TWA_SIGNAL); |
9449 | if (WARN_ON_ONCE(ret)) | |
9450 | continue; | |
9451 | wake_up_process(node->task); | |
9452 | ||
9453 | mutex_unlock(&ctx->uring_lock); | |
9454 | wait_for_completion(&exit.completion); | |
d56d938b PB |
9455 | mutex_lock(&ctx->uring_lock); |
9456 | } | |
9457 | mutex_unlock(&ctx->uring_lock); | |
79ebeaee JA |
9458 | spin_lock(&ctx->completion_lock); |
9459 | spin_unlock(&ctx->completion_lock); | |
d56d938b | 9460 | |
85faa7b8 JA |
9461 | io_ring_ctx_free(ctx); |
9462 | } | |
9463 | ||
80c4cbdb PB |
9464 | /* Returns true if we found and killed one or more timeouts */ |
9465 | static bool io_kill_timeouts(struct io_ring_ctx *ctx, struct task_struct *tsk, | |
3dd0c97a | 9466 | bool cancel_all) |
80c4cbdb PB |
9467 | { |
9468 | struct io_kiocb *req, *tmp; | |
9469 | int canceled = 0; | |
9470 | ||
79ebeaee JA |
9471 | spin_lock(&ctx->completion_lock); |
9472 | spin_lock_irq(&ctx->timeout_lock); | |
80c4cbdb | 9473 | list_for_each_entry_safe(req, tmp, &ctx->timeout_list, timeout.list) { |
3dd0c97a | 9474 | if (io_match_task(req, tsk, cancel_all)) { |
80c4cbdb PB |
9475 | io_kill_timeout(req, -ECANCELED); |
9476 | canceled++; | |
9477 | } | |
9478 | } | |
79ebeaee | 9479 | spin_unlock_irq(&ctx->timeout_lock); |
51520426 PB |
9480 | if (canceled != 0) |
9481 | io_commit_cqring(ctx); | |
79ebeaee | 9482 | spin_unlock(&ctx->completion_lock); |
80c4cbdb PB |
9483 | if (canceled != 0) |
9484 | io_cqring_ev_posted(ctx); | |
9485 | return canceled != 0; | |
9486 | } | |
9487 | ||
2b188cc1 JA |
9488 | static void io_ring_ctx_wait_and_kill(struct io_ring_ctx *ctx) |
9489 | { | |
61cf9370 MWO |
9490 | unsigned long index; |
9491 | struct creds *creds; | |
9492 | ||
2b188cc1 JA |
9493 | mutex_lock(&ctx->uring_lock); |
9494 | percpu_ref_kill(&ctx->refs); | |
634578f8 | 9495 | if (ctx->rings) |
6c2450ae | 9496 | __io_cqring_overflow_flush(ctx, true); |
61cf9370 MWO |
9497 | xa_for_each(&ctx->personalities, index, creds) |
9498 | io_unregister_personality(ctx, index); | |
2b188cc1 JA |
9499 | mutex_unlock(&ctx->uring_lock); |
9500 | ||
3dd0c97a PB |
9501 | io_kill_timeouts(ctx, NULL, true); |
9502 | io_poll_remove_all(ctx, NULL, true); | |
561fb04a | 9503 | |
15dff286 | 9504 | /* if we failed setting up the ctx, we might not have any rings */ |
b2edc0a7 | 9505 | io_iopoll_try_reap_events(ctx); |
309fc03a | 9506 | |
85faa7b8 | 9507 | INIT_WORK(&ctx->exit_work, io_ring_exit_work); |
fc666777 JA |
9508 | /* |
9509 | * Use system_unbound_wq to avoid spawning tons of event kworkers | |
9510 | * if we're exiting a ton of rings at the same time. It just adds | |
9511 | * noise and overhead, there's no discernable change in runtime | |
9512 | * over using system_wq. | |
9513 | */ | |
9514 | queue_work(system_unbound_wq, &ctx->exit_work); | |
2b188cc1 JA |
9515 | } |
9516 | ||
9517 | static int io_uring_release(struct inode *inode, struct file *file) | |
9518 | { | |
9519 | struct io_ring_ctx *ctx = file->private_data; | |
9520 | ||
9521 | file->private_data = NULL; | |
9522 | io_ring_ctx_wait_and_kill(ctx); | |
9523 | return 0; | |
9524 | } | |
9525 | ||
f6edbabb PB |
9526 | struct io_task_cancel { |
9527 | struct task_struct *task; | |
3dd0c97a | 9528 | bool all; |
f6edbabb | 9529 | }; |
f254ac04 | 9530 | |
f6edbabb | 9531 | static bool io_cancel_task_cb(struct io_wq_work *work, void *data) |
b711d4ea | 9532 | { |
9a472ef7 | 9533 | struct io_kiocb *req = container_of(work, struct io_kiocb, work); |
f6edbabb | 9534 | struct io_task_cancel *cancel = data; |
9a472ef7 PB |
9535 | bool ret; |
9536 | ||
3dd0c97a | 9537 | if (!cancel->all && (req->flags & REQ_F_LINK_TIMEOUT)) { |
9a472ef7 PB |
9538 | struct io_ring_ctx *ctx = req->ctx; |
9539 | ||
9540 | /* protect against races with linked timeouts */ | |
79ebeaee | 9541 | spin_lock(&ctx->completion_lock); |
3dd0c97a | 9542 | ret = io_match_task(req, cancel->task, cancel->all); |
79ebeaee | 9543 | spin_unlock(&ctx->completion_lock); |
9a472ef7 | 9544 | } else { |
3dd0c97a | 9545 | ret = io_match_task(req, cancel->task, cancel->all); |
9a472ef7 PB |
9546 | } |
9547 | return ret; | |
b711d4ea JA |
9548 | } |
9549 | ||
e1915f76 | 9550 | static bool io_cancel_defer_files(struct io_ring_ctx *ctx, |
3dd0c97a | 9551 | struct task_struct *task, bool cancel_all) |
b7ddce3c | 9552 | { |
e1915f76 | 9553 | struct io_defer_entry *de; |
b7ddce3c PB |
9554 | LIST_HEAD(list); |
9555 | ||
79ebeaee | 9556 | spin_lock(&ctx->completion_lock); |
b7ddce3c | 9557 | list_for_each_entry_reverse(de, &ctx->defer_list, list) { |
3dd0c97a | 9558 | if (io_match_task(de->req, task, cancel_all)) { |
b7ddce3c PB |
9559 | list_cut_position(&list, &ctx->defer_list, &de->list); |
9560 | break; | |
9561 | } | |
9562 | } | |
79ebeaee | 9563 | spin_unlock(&ctx->completion_lock); |
e1915f76 PB |
9564 | if (list_empty(&list)) |
9565 | return false; | |
b7ddce3c PB |
9566 | |
9567 | while (!list_empty(&list)) { | |
9568 | de = list_first_entry(&list, struct io_defer_entry, list); | |
9569 | list_del_init(&de->list); | |
f41db273 | 9570 | io_req_complete_failed(de->req, -ECANCELED); |
b7ddce3c PB |
9571 | kfree(de); |
9572 | } | |
e1915f76 | 9573 | return true; |
b7ddce3c PB |
9574 | } |
9575 | ||
1b00764f PB |
9576 | static bool io_uring_try_cancel_iowq(struct io_ring_ctx *ctx) |
9577 | { | |
9578 | struct io_tctx_node *node; | |
9579 | enum io_wq_cancel cret; | |
9580 | bool ret = false; | |
9581 | ||
9582 | mutex_lock(&ctx->uring_lock); | |
9583 | list_for_each_entry(node, &ctx->tctx_list, ctx_node) { | |
9584 | struct io_uring_task *tctx = node->task->io_uring; | |
9585 | ||
9586 | /* | |
9587 | * io_wq will stay alive while we hold uring_lock, because it's | |
9588 | * killed after ctx nodes, which requires to take the lock. | |
9589 | */ | |
9590 | if (!tctx || !tctx->io_wq) | |
9591 | continue; | |
9592 | cret = io_wq_cancel_cb(tctx->io_wq, io_cancel_ctx_cb, ctx, true); | |
9593 | ret |= (cret != IO_WQ_CANCEL_NOTFOUND); | |
9594 | } | |
9595 | mutex_unlock(&ctx->uring_lock); | |
9596 | ||
9597 | return ret; | |
9598 | } | |
9599 | ||
9936c7c2 PB |
9600 | static void io_uring_try_cancel_requests(struct io_ring_ctx *ctx, |
9601 | struct task_struct *task, | |
3dd0c97a | 9602 | bool cancel_all) |
9936c7c2 | 9603 | { |
3dd0c97a | 9604 | struct io_task_cancel cancel = { .task = task, .all = cancel_all, }; |
1b00764f | 9605 | struct io_uring_task *tctx = task ? task->io_uring : NULL; |
9936c7c2 PB |
9606 | |
9607 | while (1) { | |
9608 | enum io_wq_cancel cret; | |
9609 | bool ret = false; | |
9610 | ||
1b00764f PB |
9611 | if (!task) { |
9612 | ret |= io_uring_try_cancel_iowq(ctx); | |
9613 | } else if (tctx && tctx->io_wq) { | |
9614 | /* | |
9615 | * Cancels requests of all rings, not only @ctx, but | |
9616 | * it's fine as the task is in exit/exec. | |
9617 | */ | |
5aa75ed5 | 9618 | cret = io_wq_cancel_cb(tctx->io_wq, io_cancel_task_cb, |
9936c7c2 PB |
9619 | &cancel, true); |
9620 | ret |= (cret != IO_WQ_CANCEL_NOTFOUND); | |
9621 | } | |
9622 | ||
9623 | /* SQPOLL thread does its own polling */ | |
3dd0c97a | 9624 | if ((!(ctx->flags & IORING_SETUP_SQPOLL) && cancel_all) || |
d052d1d6 | 9625 | (ctx->sq_data && ctx->sq_data->thread == current)) { |
9936c7c2 PB |
9626 | while (!list_empty_careful(&ctx->iopoll_list)) { |
9627 | io_iopoll_try_reap_events(ctx); | |
9628 | ret = true; | |
9629 | } | |
9630 | } | |
9631 | ||
3dd0c97a PB |
9632 | ret |= io_cancel_defer_files(ctx, task, cancel_all); |
9633 | ret |= io_poll_remove_all(ctx, task, cancel_all); | |
9634 | ret |= io_kill_timeouts(ctx, task, cancel_all); | |
e5dc480d PB |
9635 | if (task) |
9636 | ret |= io_run_task_work(); | |
9936c7c2 PB |
9637 | if (!ret) |
9638 | break; | |
9639 | cond_resched(); | |
9640 | } | |
9641 | } | |
9642 | ||
eef51daa | 9643 | static int __io_uring_add_tctx_node(struct io_ring_ctx *ctx) |
0f212204 | 9644 | { |
236434c3 | 9645 | struct io_uring_task *tctx = current->io_uring; |
13bf43f5 | 9646 | struct io_tctx_node *node; |
a528b04e | 9647 | int ret; |
236434c3 MWO |
9648 | |
9649 | if (unlikely(!tctx)) { | |
5aa75ed5 | 9650 | ret = io_uring_alloc_task_context(current, ctx); |
0f212204 JA |
9651 | if (unlikely(ret)) |
9652 | return ret; | |
236434c3 | 9653 | tctx = current->io_uring; |
0f212204 | 9654 | } |
cf27f3b1 PB |
9655 | if (!xa_load(&tctx->xa, (unsigned long)ctx)) { |
9656 | node = kmalloc(sizeof(*node), GFP_KERNEL); | |
9657 | if (!node) | |
9658 | return -ENOMEM; | |
9659 | node->ctx = ctx; | |
9660 | node->task = current; | |
13bf43f5 | 9661 | |
cf27f3b1 PB |
9662 | ret = xa_err(xa_store(&tctx->xa, (unsigned long)ctx, |
9663 | node, GFP_KERNEL)); | |
9664 | if (ret) { | |
9665 | kfree(node); | |
9666 | return ret; | |
0f212204 | 9667 | } |
cf27f3b1 PB |
9668 | |
9669 | mutex_lock(&ctx->uring_lock); | |
9670 | list_add(&node->ctx_node, &ctx->tctx_list); | |
9671 | mutex_unlock(&ctx->uring_lock); | |
0f212204 | 9672 | } |
cf27f3b1 | 9673 | tctx->last = ctx; |
0f212204 JA |
9674 | return 0; |
9675 | } | |
9676 | ||
cf27f3b1 PB |
9677 | /* |
9678 | * Note that this task has used io_uring. We use it for cancelation purposes. | |
9679 | */ | |
eef51daa | 9680 | static inline int io_uring_add_tctx_node(struct io_ring_ctx *ctx) |
cf27f3b1 PB |
9681 | { |
9682 | struct io_uring_task *tctx = current->io_uring; | |
9683 | ||
9684 | if (likely(tctx && tctx->last == ctx)) | |
9685 | return 0; | |
eef51daa | 9686 | return __io_uring_add_tctx_node(ctx); |
cf27f3b1 PB |
9687 | } |
9688 | ||
0f212204 JA |
9689 | /* |
9690 | * Remove this io_uring_file -> task mapping. | |
9691 | */ | |
eef51daa | 9692 | static void io_uring_del_tctx_node(unsigned long index) |
0f212204 JA |
9693 | { |
9694 | struct io_uring_task *tctx = current->io_uring; | |
13bf43f5 | 9695 | struct io_tctx_node *node; |
2941267b | 9696 | |
eebd2e37 PB |
9697 | if (!tctx) |
9698 | return; | |
13bf43f5 PB |
9699 | node = xa_erase(&tctx->xa, index); |
9700 | if (!node) | |
2941267b | 9701 | return; |
0f212204 | 9702 | |
13bf43f5 PB |
9703 | WARN_ON_ONCE(current != node->task); |
9704 | WARN_ON_ONCE(list_empty(&node->ctx_node)); | |
9705 | ||
9706 | mutex_lock(&node->ctx->uring_lock); | |
9707 | list_del(&node->ctx_node); | |
9708 | mutex_unlock(&node->ctx->uring_lock); | |
9709 | ||
baf186c4 | 9710 | if (tctx->last == node->ctx) |
0f212204 | 9711 | tctx->last = NULL; |
13bf43f5 | 9712 | kfree(node); |
0f212204 JA |
9713 | } |
9714 | ||
8452d4a6 | 9715 | static void io_uring_clean_tctx(struct io_uring_task *tctx) |
de7f1d9e | 9716 | { |
ba5ef6dc | 9717 | struct io_wq *wq = tctx->io_wq; |
13bf43f5 | 9718 | struct io_tctx_node *node; |
de7f1d9e PB |
9719 | unsigned long index; |
9720 | ||
8bab4c09 | 9721 | xa_for_each(&tctx->xa, index, node) { |
eef51daa | 9722 | io_uring_del_tctx_node(index); |
8bab4c09 JA |
9723 | cond_resched(); |
9724 | } | |
b16ef427 ME |
9725 | if (wq) { |
9726 | /* | |
9727 | * Must be after io_uring_del_task_file() (removes nodes under | |
9728 | * uring_lock) to avoid race with io_uring_try_cancel_iowq(). | |
9729 | */ | |
ba5ef6dc | 9730 | io_wq_put_and_exit(wq); |
dadebc35 | 9731 | tctx->io_wq = NULL; |
b16ef427 | 9732 | } |
de7f1d9e PB |
9733 | } |
9734 | ||
3f48cf18 | 9735 | static s64 tctx_inflight(struct io_uring_task *tctx, bool tracked) |
521d6a73 | 9736 | { |
3f48cf18 PB |
9737 | if (tracked) |
9738 | return atomic_read(&tctx->inflight_tracked); | |
521d6a73 PB |
9739 | return percpu_counter_sum(&tctx->inflight); |
9740 | } | |
9741 | ||
09899b19 PB |
9742 | static void io_uring_drop_tctx_refs(struct task_struct *task) |
9743 | { | |
9744 | struct io_uring_task *tctx = task->io_uring; | |
9745 | unsigned int refs = tctx->cached_refs; | |
9746 | ||
e9dbe221 PB |
9747 | if (refs) { |
9748 | tctx->cached_refs = 0; | |
9749 | percpu_counter_sub(&tctx->inflight, refs); | |
9750 | put_task_struct_many(task, refs); | |
9751 | } | |
09899b19 PB |
9752 | } |
9753 | ||
78cc687b PB |
9754 | /* |
9755 | * Find any io_uring ctx that this task has registered or done IO on, and cancel | |
9756 | * requests. @sqd should be not-null IIF it's an SQPOLL thread cancellation. | |
9757 | */ | |
9758 | static void io_uring_cancel_generic(bool cancel_all, struct io_sq_data *sqd) | |
0e9ddb39 | 9759 | { |
521d6a73 | 9760 | struct io_uring_task *tctx = current->io_uring; |
734551df | 9761 | struct io_ring_ctx *ctx; |
0e9ddb39 PB |
9762 | s64 inflight; |
9763 | DEFINE_WAIT(wait); | |
fdaf083c | 9764 | |
78cc687b PB |
9765 | WARN_ON_ONCE(sqd && sqd->thread != current); |
9766 | ||
6d042ffb PO |
9767 | if (!current->io_uring) |
9768 | return; | |
17a91051 PB |
9769 | if (tctx->io_wq) |
9770 | io_wq_exit_start(tctx->io_wq); | |
9771 | ||
0e9ddb39 PB |
9772 | atomic_inc(&tctx->in_idle); |
9773 | do { | |
e9dbe221 | 9774 | io_uring_drop_tctx_refs(current); |
0e9ddb39 | 9775 | /* read completions before cancelations */ |
78cc687b | 9776 | inflight = tctx_inflight(tctx, !cancel_all); |
0e9ddb39 PB |
9777 | if (!inflight) |
9778 | break; | |
fdaf083c | 9779 | |
78cc687b PB |
9780 | if (!sqd) { |
9781 | struct io_tctx_node *node; | |
9782 | unsigned long index; | |
0f212204 | 9783 | |
78cc687b PB |
9784 | xa_for_each(&tctx->xa, index, node) { |
9785 | /* sqpoll task will cancel all its requests */ | |
9786 | if (node->ctx->sq_data) | |
9787 | continue; | |
9788 | io_uring_try_cancel_requests(node->ctx, current, | |
9789 | cancel_all); | |
9790 | } | |
9791 | } else { | |
9792 | list_for_each_entry(ctx, &sqd->ctx_list, sqd_list) | |
9793 | io_uring_try_cancel_requests(ctx, current, | |
9794 | cancel_all); | |
9795 | } | |
17a91051 | 9796 | |
0f212204 | 9797 | prepare_to_wait(&tctx->wait, &wait, TASK_UNINTERRUPTIBLE); |
e9dbe221 | 9798 | io_uring_drop_tctx_refs(current); |
0f212204 | 9799 | /* |
a1bb3cd5 PB |
9800 | * If we've seen completions, retry without waiting. This |
9801 | * avoids a race where a completion comes in before we did | |
9802 | * prepare_to_wait(). | |
0f212204 | 9803 | */ |
3dd0c97a | 9804 | if (inflight == tctx_inflight(tctx, !cancel_all)) |
a1bb3cd5 | 9805 | schedule(); |
f57555ed | 9806 | finish_wait(&tctx->wait, &wait); |
d8a6df10 | 9807 | } while (1); |
fdaf083c | 9808 | atomic_dec(&tctx->in_idle); |
de7f1d9e | 9809 | |
8452d4a6 | 9810 | io_uring_clean_tctx(tctx); |
3dd0c97a | 9811 | if (cancel_all) { |
3f48cf18 PB |
9812 | /* for exec all current's requests should be gone, kill tctx */ |
9813 | __io_uring_free(current); | |
9814 | } | |
44e728b8 PB |
9815 | } |
9816 | ||
f552a27a | 9817 | void __io_uring_cancel(bool cancel_all) |
78cc687b | 9818 | { |
f552a27a | 9819 | io_uring_cancel_generic(cancel_all, NULL); |
78cc687b PB |
9820 | } |
9821 | ||
6c5c240e RP |
9822 | static void *io_uring_validate_mmap_request(struct file *file, |
9823 | loff_t pgoff, size_t sz) | |
2b188cc1 | 9824 | { |
2b188cc1 | 9825 | struct io_ring_ctx *ctx = file->private_data; |
6c5c240e | 9826 | loff_t offset = pgoff << PAGE_SHIFT; |
2b188cc1 JA |
9827 | struct page *page; |
9828 | void *ptr; | |
9829 | ||
9830 | switch (offset) { | |
9831 | case IORING_OFF_SQ_RING: | |
75b28aff HV |
9832 | case IORING_OFF_CQ_RING: |
9833 | ptr = ctx->rings; | |
2b188cc1 JA |
9834 | break; |
9835 | case IORING_OFF_SQES: | |
9836 | ptr = ctx->sq_sqes; | |
9837 | break; | |
2b188cc1 | 9838 | default: |
6c5c240e | 9839 | return ERR_PTR(-EINVAL); |
2b188cc1 JA |
9840 | } |
9841 | ||
9842 | page = virt_to_head_page(ptr); | |
a50b854e | 9843 | if (sz > page_size(page)) |
6c5c240e RP |
9844 | return ERR_PTR(-EINVAL); |
9845 | ||
9846 | return ptr; | |
9847 | } | |
9848 | ||
9849 | #ifdef CONFIG_MMU | |
9850 | ||
9851 | static int io_uring_mmap(struct file *file, struct vm_area_struct *vma) | |
9852 | { | |
9853 | size_t sz = vma->vm_end - vma->vm_start; | |
9854 | unsigned long pfn; | |
9855 | void *ptr; | |
9856 | ||
9857 | ptr = io_uring_validate_mmap_request(file, vma->vm_pgoff, sz); | |
9858 | if (IS_ERR(ptr)) | |
9859 | return PTR_ERR(ptr); | |
2b188cc1 JA |
9860 | |
9861 | pfn = virt_to_phys(ptr) >> PAGE_SHIFT; | |
9862 | return remap_pfn_range(vma, vma->vm_start, pfn, sz, vma->vm_page_prot); | |
9863 | } | |
9864 | ||
6c5c240e RP |
9865 | #else /* !CONFIG_MMU */ |
9866 | ||
9867 | static int io_uring_mmap(struct file *file, struct vm_area_struct *vma) | |
9868 | { | |
9869 | return vma->vm_flags & (VM_SHARED | VM_MAYSHARE) ? 0 : -EINVAL; | |
9870 | } | |
9871 | ||
9872 | static unsigned int io_uring_nommu_mmap_capabilities(struct file *file) | |
9873 | { | |
9874 | return NOMMU_MAP_DIRECT | NOMMU_MAP_READ | NOMMU_MAP_WRITE; | |
9875 | } | |
9876 | ||
9877 | static unsigned long io_uring_nommu_get_unmapped_area(struct file *file, | |
9878 | unsigned long addr, unsigned long len, | |
9879 | unsigned long pgoff, unsigned long flags) | |
9880 | { | |
9881 | void *ptr; | |
9882 | ||
9883 | ptr = io_uring_validate_mmap_request(file, pgoff, len); | |
9884 | if (IS_ERR(ptr)) | |
9885 | return PTR_ERR(ptr); | |
9886 | ||
9887 | return (unsigned long) ptr; | |
9888 | } | |
9889 | ||
9890 | #endif /* !CONFIG_MMU */ | |
9891 | ||
d9d05217 | 9892 | static int io_sqpoll_wait_sq(struct io_ring_ctx *ctx) |
90554200 JA |
9893 | { |
9894 | DEFINE_WAIT(wait); | |
9895 | ||
9896 | do { | |
9897 | if (!io_sqring_full(ctx)) | |
9898 | break; | |
90554200 JA |
9899 | prepare_to_wait(&ctx->sqo_sq_wait, &wait, TASK_INTERRUPTIBLE); |
9900 | ||
9901 | if (!io_sqring_full(ctx)) | |
9902 | break; | |
90554200 JA |
9903 | schedule(); |
9904 | } while (!signal_pending(current)); | |
9905 | ||
9906 | finish_wait(&ctx->sqo_sq_wait, &wait); | |
5199328a | 9907 | return 0; |
90554200 JA |
9908 | } |
9909 | ||
c73ebb68 HX |
9910 | static int io_get_ext_arg(unsigned flags, const void __user *argp, size_t *argsz, |
9911 | struct __kernel_timespec __user **ts, | |
9912 | const sigset_t __user **sig) | |
9913 | { | |
9914 | struct io_uring_getevents_arg arg; | |
9915 | ||
9916 | /* | |
9917 | * If EXT_ARG isn't set, then we have no timespec and the argp pointer | |
9918 | * is just a pointer to the sigset_t. | |
9919 | */ | |
9920 | if (!(flags & IORING_ENTER_EXT_ARG)) { | |
9921 | *sig = (const sigset_t __user *) argp; | |
9922 | *ts = NULL; | |
9923 | return 0; | |
9924 | } | |
9925 | ||
9926 | /* | |
9927 | * EXT_ARG is set - ensure we agree on the size of it and copy in our | |
9928 | * timespec and sigset_t pointers if good. | |
9929 | */ | |
9930 | if (*argsz != sizeof(arg)) | |
9931 | return -EINVAL; | |
9932 | if (copy_from_user(&arg, argp, sizeof(arg))) | |
9933 | return -EFAULT; | |
9934 | *sig = u64_to_user_ptr(arg.sigmask); | |
9935 | *argsz = arg.sigmask_sz; | |
9936 | *ts = u64_to_user_ptr(arg.ts); | |
9937 | return 0; | |
9938 | } | |
9939 | ||
2b188cc1 | 9940 | SYSCALL_DEFINE6(io_uring_enter, unsigned int, fd, u32, to_submit, |
c73ebb68 HX |
9941 | u32, min_complete, u32, flags, const void __user *, argp, |
9942 | size_t, argsz) | |
2b188cc1 JA |
9943 | { |
9944 | struct io_ring_ctx *ctx; | |
2b188cc1 JA |
9945 | int submitted = 0; |
9946 | struct fd f; | |
33f993da | 9947 | long ret; |
2b188cc1 | 9948 | |
4c6e277c | 9949 | io_run_task_work(); |
b41e9852 | 9950 | |
33f993da PB |
9951 | if (unlikely(flags & ~(IORING_ENTER_GETEVENTS | IORING_ENTER_SQ_WAKEUP | |
9952 | IORING_ENTER_SQ_WAIT | IORING_ENTER_EXT_ARG))) | |
2b188cc1 JA |
9953 | return -EINVAL; |
9954 | ||
9955 | f = fdget(fd); | |
33f993da | 9956 | if (unlikely(!f.file)) |
2b188cc1 JA |
9957 | return -EBADF; |
9958 | ||
9959 | ret = -EOPNOTSUPP; | |
33f993da | 9960 | if (unlikely(f.file->f_op != &io_uring_fops)) |
2b188cc1 JA |
9961 | goto out_fput; |
9962 | ||
9963 | ret = -ENXIO; | |
9964 | ctx = f.file->private_data; | |
33f993da | 9965 | if (unlikely(!percpu_ref_tryget(&ctx->refs))) |
2b188cc1 JA |
9966 | goto out_fput; |
9967 | ||
7e84e1c7 | 9968 | ret = -EBADFD; |
33f993da | 9969 | if (unlikely(ctx->flags & IORING_SETUP_R_DISABLED)) |
7e84e1c7 SG |
9970 | goto out; |
9971 | ||
6c271ce2 JA |
9972 | /* |
9973 | * For SQ polling, the thread will do all submissions and completions. | |
9974 | * Just return the requested submit count, and wake the thread if | |
9975 | * we were asked to. | |
9976 | */ | |
b2a9eada | 9977 | ret = 0; |
6c271ce2 | 9978 | if (ctx->flags & IORING_SETUP_SQPOLL) { |
90f67366 | 9979 | io_cqring_overflow_flush(ctx); |
89448c47 | 9980 | |
21f96522 JA |
9981 | if (unlikely(ctx->sq_data->thread == NULL)) { |
9982 | ret = -EOWNERDEAD; | |
04147488 | 9983 | goto out; |
21f96522 | 9984 | } |
6c271ce2 | 9985 | if (flags & IORING_ENTER_SQ_WAKEUP) |
534ca6d6 | 9986 | wake_up(&ctx->sq_data->wait); |
d9d05217 PB |
9987 | if (flags & IORING_ENTER_SQ_WAIT) { |
9988 | ret = io_sqpoll_wait_sq(ctx); | |
9989 | if (ret) | |
9990 | goto out; | |
9991 | } | |
6c271ce2 | 9992 | submitted = to_submit; |
b2a9eada | 9993 | } else if (to_submit) { |
eef51daa | 9994 | ret = io_uring_add_tctx_node(ctx); |
0f212204 JA |
9995 | if (unlikely(ret)) |
9996 | goto out; | |
2b188cc1 | 9997 | mutex_lock(&ctx->uring_lock); |
0f212204 | 9998 | submitted = io_submit_sqes(ctx, to_submit); |
2b188cc1 | 9999 | mutex_unlock(&ctx->uring_lock); |
7c504e65 PB |
10000 | |
10001 | if (submitted != to_submit) | |
10002 | goto out; | |
2b188cc1 JA |
10003 | } |
10004 | if (flags & IORING_ENTER_GETEVENTS) { | |
c73ebb68 HX |
10005 | const sigset_t __user *sig; |
10006 | struct __kernel_timespec __user *ts; | |
10007 | ||
10008 | ret = io_get_ext_arg(flags, argp, &argsz, &ts, &sig); | |
10009 | if (unlikely(ret)) | |
10010 | goto out; | |
10011 | ||
2b188cc1 JA |
10012 | min_complete = min(min_complete, ctx->cq_entries); |
10013 | ||
32b2244a XW |
10014 | /* |
10015 | * When SETUP_IOPOLL and SETUP_SQPOLL are both enabled, user | |
10016 | * space applications don't need to do io completion events | |
10017 | * polling again, they can rely on io_sq_thread to do polling | |
10018 | * work, which can reduce cpu usage and uring_lock contention. | |
10019 | */ | |
10020 | if (ctx->flags & IORING_SETUP_IOPOLL && | |
10021 | !(ctx->flags & IORING_SETUP_SQPOLL)) { | |
7668b92a | 10022 | ret = io_iopoll_check(ctx, min_complete); |
def596e9 | 10023 | } else { |
c73ebb68 | 10024 | ret = io_cqring_wait(ctx, min_complete, sig, argsz, ts); |
def596e9 | 10025 | } |
2b188cc1 JA |
10026 | } |
10027 | ||
7c504e65 | 10028 | out: |
6805b32e | 10029 | percpu_ref_put(&ctx->refs); |
2b188cc1 JA |
10030 | out_fput: |
10031 | fdput(f); | |
10032 | return submitted ? submitted : ret; | |
10033 | } | |
10034 | ||
bebdb65e | 10035 | #ifdef CONFIG_PROC_FS |
61cf9370 MWO |
10036 | static int io_uring_show_cred(struct seq_file *m, unsigned int id, |
10037 | const struct cred *cred) | |
87ce955b | 10038 | { |
87ce955b JA |
10039 | struct user_namespace *uns = seq_user_ns(m); |
10040 | struct group_info *gi; | |
10041 | kernel_cap_t cap; | |
10042 | unsigned __capi; | |
10043 | int g; | |
10044 | ||
10045 | seq_printf(m, "%5d\n", id); | |
10046 | seq_put_decimal_ull(m, "\tUid:\t", from_kuid_munged(uns, cred->uid)); | |
10047 | seq_put_decimal_ull(m, "\t\t", from_kuid_munged(uns, cred->euid)); | |
10048 | seq_put_decimal_ull(m, "\t\t", from_kuid_munged(uns, cred->suid)); | |
10049 | seq_put_decimal_ull(m, "\t\t", from_kuid_munged(uns, cred->fsuid)); | |
10050 | seq_put_decimal_ull(m, "\n\tGid:\t", from_kgid_munged(uns, cred->gid)); | |
10051 | seq_put_decimal_ull(m, "\t\t", from_kgid_munged(uns, cred->egid)); | |
10052 | seq_put_decimal_ull(m, "\t\t", from_kgid_munged(uns, cred->sgid)); | |
10053 | seq_put_decimal_ull(m, "\t\t", from_kgid_munged(uns, cred->fsgid)); | |
10054 | seq_puts(m, "\n\tGroups:\t"); | |
10055 | gi = cred->group_info; | |
10056 | for (g = 0; g < gi->ngroups; g++) { | |
10057 | seq_put_decimal_ull(m, g ? " " : "", | |
10058 | from_kgid_munged(uns, gi->gid[g])); | |
10059 | } | |
10060 | seq_puts(m, "\n\tCapEff:\t"); | |
10061 | cap = cred->cap_effective; | |
10062 | CAP_FOR_EACH_U32(__capi) | |
10063 | seq_put_hex_ll(m, NULL, cap.cap[CAP_LAST_U32 - __capi], 8); | |
10064 | seq_putc(m, '\n'); | |
10065 | return 0; | |
10066 | } | |
10067 | ||
10068 | static void __io_uring_show_fdinfo(struct io_ring_ctx *ctx, struct seq_file *m) | |
10069 | { | |
dbbe9c64 | 10070 | struct io_sq_data *sq = NULL; |
fad8e0de | 10071 | bool has_lock; |
87ce955b JA |
10072 | int i; |
10073 | ||
fad8e0de JA |
10074 | /* |
10075 | * Avoid ABBA deadlock between the seq lock and the io_uring mutex, | |
10076 | * since fdinfo case grabs it in the opposite direction of normal use | |
10077 | * cases. If we fail to get the lock, we just don't iterate any | |
10078 | * structures that could be going away outside the io_uring mutex. | |
10079 | */ | |
10080 | has_lock = mutex_trylock(&ctx->uring_lock); | |
10081 | ||
5f3f26f9 | 10082 | if (has_lock && (ctx->flags & IORING_SETUP_SQPOLL)) { |
dbbe9c64 | 10083 | sq = ctx->sq_data; |
5f3f26f9 JA |
10084 | if (!sq->thread) |
10085 | sq = NULL; | |
10086 | } | |
dbbe9c64 JQ |
10087 | |
10088 | seq_printf(m, "SqThread:\t%d\n", sq ? task_pid_nr(sq->thread) : -1); | |
10089 | seq_printf(m, "SqThreadCpu:\t%d\n", sq ? task_cpu(sq->thread) : -1); | |
87ce955b | 10090 | seq_printf(m, "UserFiles:\t%u\n", ctx->nr_user_files); |
fad8e0de | 10091 | for (i = 0; has_lock && i < ctx->nr_user_files; i++) { |
7b29f92d | 10092 | struct file *f = io_file_from_index(ctx, i); |
87ce955b | 10093 | |
87ce955b JA |
10094 | if (f) |
10095 | seq_printf(m, "%5u: %s\n", i, file_dentry(f)->d_iname); | |
10096 | else | |
10097 | seq_printf(m, "%5u: <none>\n", i); | |
10098 | } | |
10099 | seq_printf(m, "UserBufs:\t%u\n", ctx->nr_user_bufs); | |
fad8e0de | 10100 | for (i = 0; has_lock && i < ctx->nr_user_bufs; i++) { |
41edf1a5 | 10101 | struct io_mapped_ubuf *buf = ctx->user_bufs[i]; |
4751f53d | 10102 | unsigned int len = buf->ubuf_end - buf->ubuf; |
87ce955b | 10103 | |
4751f53d | 10104 | seq_printf(m, "%5u: 0x%llx/%u\n", i, buf->ubuf, len); |
87ce955b | 10105 | } |
61cf9370 MWO |
10106 | if (has_lock && !xa_empty(&ctx->personalities)) { |
10107 | unsigned long index; | |
10108 | const struct cred *cred; | |
10109 | ||
87ce955b | 10110 | seq_printf(m, "Personalities:\n"); |
61cf9370 MWO |
10111 | xa_for_each(&ctx->personalities, index, cred) |
10112 | io_uring_show_cred(m, index, cred); | |
87ce955b | 10113 | } |
d7718a9d | 10114 | seq_printf(m, "PollList:\n"); |
79ebeaee | 10115 | spin_lock(&ctx->completion_lock); |
d7718a9d JA |
10116 | for (i = 0; i < (1U << ctx->cancel_hash_bits); i++) { |
10117 | struct hlist_head *list = &ctx->cancel_hash[i]; | |
10118 | struct io_kiocb *req; | |
10119 | ||
10120 | hlist_for_each_entry(req, list, hash_node) | |
10121 | seq_printf(m, " op=%d, task_works=%d\n", req->opcode, | |
10122 | req->task->task_works != NULL); | |
10123 | } | |
79ebeaee | 10124 | spin_unlock(&ctx->completion_lock); |
fad8e0de JA |
10125 | if (has_lock) |
10126 | mutex_unlock(&ctx->uring_lock); | |
87ce955b JA |
10127 | } |
10128 | ||
10129 | static void io_uring_show_fdinfo(struct seq_file *m, struct file *f) | |
10130 | { | |
10131 | struct io_ring_ctx *ctx = f->private_data; | |
10132 | ||
10133 | if (percpu_ref_tryget(&ctx->refs)) { | |
10134 | __io_uring_show_fdinfo(ctx, m); | |
10135 | percpu_ref_put(&ctx->refs); | |
10136 | } | |
10137 | } | |
bebdb65e | 10138 | #endif |
87ce955b | 10139 | |
2b188cc1 JA |
10140 | static const struct file_operations io_uring_fops = { |
10141 | .release = io_uring_release, | |
10142 | .mmap = io_uring_mmap, | |
6c5c240e RP |
10143 | #ifndef CONFIG_MMU |
10144 | .get_unmapped_area = io_uring_nommu_get_unmapped_area, | |
10145 | .mmap_capabilities = io_uring_nommu_mmap_capabilities, | |
10146 | #endif | |
2b188cc1 JA |
10147 | .poll = io_uring_poll, |
10148 | .fasync = io_uring_fasync, | |
bebdb65e | 10149 | #ifdef CONFIG_PROC_FS |
87ce955b | 10150 | .show_fdinfo = io_uring_show_fdinfo, |
bebdb65e | 10151 | #endif |
2b188cc1 JA |
10152 | }; |
10153 | ||
10154 | static int io_allocate_scq_urings(struct io_ring_ctx *ctx, | |
10155 | struct io_uring_params *p) | |
10156 | { | |
75b28aff HV |
10157 | struct io_rings *rings; |
10158 | size_t size, sq_array_offset; | |
2b188cc1 | 10159 | |
bd740481 JA |
10160 | /* make sure these are sane, as we already accounted them */ |
10161 | ctx->sq_entries = p->sq_entries; | |
10162 | ctx->cq_entries = p->cq_entries; | |
10163 | ||
75b28aff HV |
10164 | size = rings_size(p->sq_entries, p->cq_entries, &sq_array_offset); |
10165 | if (size == SIZE_MAX) | |
10166 | return -EOVERFLOW; | |
10167 | ||
10168 | rings = io_mem_alloc(size); | |
10169 | if (!rings) | |
2b188cc1 JA |
10170 | return -ENOMEM; |
10171 | ||
75b28aff HV |
10172 | ctx->rings = rings; |
10173 | ctx->sq_array = (u32 *)((char *)rings + sq_array_offset); | |
10174 | rings->sq_ring_mask = p->sq_entries - 1; | |
10175 | rings->cq_ring_mask = p->cq_entries - 1; | |
10176 | rings->sq_ring_entries = p->sq_entries; | |
10177 | rings->cq_ring_entries = p->cq_entries; | |
2b188cc1 JA |
10178 | |
10179 | size = array_size(sizeof(struct io_uring_sqe), p->sq_entries); | |
eb065d30 JA |
10180 | if (size == SIZE_MAX) { |
10181 | io_mem_free(ctx->rings); | |
10182 | ctx->rings = NULL; | |
2b188cc1 | 10183 | return -EOVERFLOW; |
eb065d30 | 10184 | } |
2b188cc1 JA |
10185 | |
10186 | ctx->sq_sqes = io_mem_alloc(size); | |
eb065d30 JA |
10187 | if (!ctx->sq_sqes) { |
10188 | io_mem_free(ctx->rings); | |
10189 | ctx->rings = NULL; | |
2b188cc1 | 10190 | return -ENOMEM; |
eb065d30 | 10191 | } |
2b188cc1 | 10192 | |
2b188cc1 JA |
10193 | return 0; |
10194 | } | |
10195 | ||
9faadcc8 PB |
10196 | static int io_uring_install_fd(struct io_ring_ctx *ctx, struct file *file) |
10197 | { | |
10198 | int ret, fd; | |
10199 | ||
10200 | fd = get_unused_fd_flags(O_RDWR | O_CLOEXEC); | |
10201 | if (fd < 0) | |
10202 | return fd; | |
10203 | ||
eef51daa | 10204 | ret = io_uring_add_tctx_node(ctx); |
9faadcc8 PB |
10205 | if (ret) { |
10206 | put_unused_fd(fd); | |
10207 | return ret; | |
10208 | } | |
10209 | fd_install(fd, file); | |
10210 | return fd; | |
10211 | } | |
10212 | ||
2b188cc1 JA |
10213 | /* |
10214 | * Allocate an anonymous fd, this is what constitutes the application | |
10215 | * visible backing of an io_uring instance. The application mmaps this | |
10216 | * fd to gain access to the SQ/CQ ring details. If UNIX sockets are enabled, | |
10217 | * we have to tie this fd to a socket for file garbage collection purposes. | |
10218 | */ | |
9faadcc8 | 10219 | static struct file *io_uring_get_file(struct io_ring_ctx *ctx) |
2b188cc1 JA |
10220 | { |
10221 | struct file *file; | |
9faadcc8 | 10222 | #if defined(CONFIG_UNIX) |
2b188cc1 JA |
10223 | int ret; |
10224 | ||
2b188cc1 JA |
10225 | ret = sock_create_kern(&init_net, PF_UNIX, SOCK_RAW, IPPROTO_IP, |
10226 | &ctx->ring_sock); | |
10227 | if (ret) | |
9faadcc8 | 10228 | return ERR_PTR(ret); |
2b188cc1 JA |
10229 | #endif |
10230 | ||
2b188cc1 JA |
10231 | file = anon_inode_getfile("[io_uring]", &io_uring_fops, ctx, |
10232 | O_RDWR | O_CLOEXEC); | |
2b188cc1 | 10233 | #if defined(CONFIG_UNIX) |
9faadcc8 PB |
10234 | if (IS_ERR(file)) { |
10235 | sock_release(ctx->ring_sock); | |
10236 | ctx->ring_sock = NULL; | |
10237 | } else { | |
10238 | ctx->ring_sock->file = file; | |
0f212204 | 10239 | } |
2b188cc1 | 10240 | #endif |
9faadcc8 | 10241 | return file; |
2b188cc1 JA |
10242 | } |
10243 | ||
7f13657d XW |
10244 | static int io_uring_create(unsigned entries, struct io_uring_params *p, |
10245 | struct io_uring_params __user *params) | |
2b188cc1 | 10246 | { |
2b188cc1 | 10247 | struct io_ring_ctx *ctx; |
9faadcc8 | 10248 | struct file *file; |
2b188cc1 JA |
10249 | int ret; |
10250 | ||
8110c1a6 | 10251 | if (!entries) |
2b188cc1 | 10252 | return -EINVAL; |
8110c1a6 JA |
10253 | if (entries > IORING_MAX_ENTRIES) { |
10254 | if (!(p->flags & IORING_SETUP_CLAMP)) | |
10255 | return -EINVAL; | |
10256 | entries = IORING_MAX_ENTRIES; | |
10257 | } | |
2b188cc1 JA |
10258 | |
10259 | /* | |
10260 | * Use twice as many entries for the CQ ring. It's possible for the | |
10261 | * application to drive a higher depth than the size of the SQ ring, | |
10262 | * since the sqes are only used at submission time. This allows for | |
33a107f0 JA |
10263 | * some flexibility in overcommitting a bit. If the application has |
10264 | * set IORING_SETUP_CQSIZE, it will have passed in the desired number | |
10265 | * of CQ ring entries manually. | |
2b188cc1 JA |
10266 | */ |
10267 | p->sq_entries = roundup_pow_of_two(entries); | |
33a107f0 JA |
10268 | if (p->flags & IORING_SETUP_CQSIZE) { |
10269 | /* | |
10270 | * If IORING_SETUP_CQSIZE is set, we do the same roundup | |
10271 | * to a power-of-two, if it isn't already. We do NOT impose | |
10272 | * any cq vs sq ring sizing. | |
10273 | */ | |
eb2667b3 | 10274 | if (!p->cq_entries) |
33a107f0 | 10275 | return -EINVAL; |
8110c1a6 JA |
10276 | if (p->cq_entries > IORING_MAX_CQ_ENTRIES) { |
10277 | if (!(p->flags & IORING_SETUP_CLAMP)) | |
10278 | return -EINVAL; | |
10279 | p->cq_entries = IORING_MAX_CQ_ENTRIES; | |
10280 | } | |
eb2667b3 JQ |
10281 | p->cq_entries = roundup_pow_of_two(p->cq_entries); |
10282 | if (p->cq_entries < p->sq_entries) | |
10283 | return -EINVAL; | |
33a107f0 JA |
10284 | } else { |
10285 | p->cq_entries = 2 * p->sq_entries; | |
10286 | } | |
2b188cc1 | 10287 | |
2b188cc1 | 10288 | ctx = io_ring_ctx_alloc(p); |
62e398be | 10289 | if (!ctx) |
2b188cc1 | 10290 | return -ENOMEM; |
2b188cc1 | 10291 | ctx->compat = in_compat_syscall(); |
62e398be JA |
10292 | if (!capable(CAP_IPC_LOCK)) |
10293 | ctx->user = get_uid(current_user()); | |
2aede0e4 JA |
10294 | |
10295 | /* | |
10296 | * This is just grabbed for accounting purposes. When a process exits, | |
10297 | * the mm is exited and dropped before the files, hence we need to hang | |
10298 | * on to this mm purely for the purposes of being able to unaccount | |
10299 | * memory (locked/pinned vm). It's not used for anything else. | |
10300 | */ | |
6b7898eb | 10301 | mmgrab(current->mm); |
2aede0e4 | 10302 | ctx->mm_account = current->mm; |
6b7898eb | 10303 | |
2b188cc1 JA |
10304 | ret = io_allocate_scq_urings(ctx, p); |
10305 | if (ret) | |
10306 | goto err; | |
10307 | ||
7e84e1c7 | 10308 | ret = io_sq_offload_create(ctx, p); |
2b188cc1 JA |
10309 | if (ret) |
10310 | goto err; | |
eae071c9 | 10311 | /* always set a rsrc node */ |
47b228ce PB |
10312 | ret = io_rsrc_node_switch_start(ctx); |
10313 | if (ret) | |
10314 | goto err; | |
eae071c9 | 10315 | io_rsrc_node_switch(ctx, NULL); |
2b188cc1 | 10316 | |
2b188cc1 | 10317 | memset(&p->sq_off, 0, sizeof(p->sq_off)); |
75b28aff HV |
10318 | p->sq_off.head = offsetof(struct io_rings, sq.head); |
10319 | p->sq_off.tail = offsetof(struct io_rings, sq.tail); | |
10320 | p->sq_off.ring_mask = offsetof(struct io_rings, sq_ring_mask); | |
10321 | p->sq_off.ring_entries = offsetof(struct io_rings, sq_ring_entries); | |
10322 | p->sq_off.flags = offsetof(struct io_rings, sq_flags); | |
10323 | p->sq_off.dropped = offsetof(struct io_rings, sq_dropped); | |
10324 | p->sq_off.array = (char *)ctx->sq_array - (char *)ctx->rings; | |
2b188cc1 JA |
10325 | |
10326 | memset(&p->cq_off, 0, sizeof(p->cq_off)); | |
75b28aff HV |
10327 | p->cq_off.head = offsetof(struct io_rings, cq.head); |
10328 | p->cq_off.tail = offsetof(struct io_rings, cq.tail); | |
10329 | p->cq_off.ring_mask = offsetof(struct io_rings, cq_ring_mask); | |
10330 | p->cq_off.ring_entries = offsetof(struct io_rings, cq_ring_entries); | |
10331 | p->cq_off.overflow = offsetof(struct io_rings, cq_overflow); | |
10332 | p->cq_off.cqes = offsetof(struct io_rings, cqes); | |
0d9b5b3a | 10333 | p->cq_off.flags = offsetof(struct io_rings, cq_flags); |
ac90f249 | 10334 | |
7f13657d XW |
10335 | p->features = IORING_FEAT_SINGLE_MMAP | IORING_FEAT_NODROP | |
10336 | IORING_FEAT_SUBMIT_STABLE | IORING_FEAT_RW_CUR_POS | | |
5769a351 | 10337 | IORING_FEAT_CUR_PERSONALITY | IORING_FEAT_FAST_POLL | |
c73ebb68 | 10338 | IORING_FEAT_POLL_32BITS | IORING_FEAT_SQPOLL_NONFIXED | |
9690557e PB |
10339 | IORING_FEAT_EXT_ARG | IORING_FEAT_NATIVE_WORKERS | |
10340 | IORING_FEAT_RSRC_TAGS; | |
7f13657d XW |
10341 | |
10342 | if (copy_to_user(params, p, sizeof(*p))) { | |
10343 | ret = -EFAULT; | |
10344 | goto err; | |
10345 | } | |
d1719f70 | 10346 | |
9faadcc8 PB |
10347 | file = io_uring_get_file(ctx); |
10348 | if (IS_ERR(file)) { | |
10349 | ret = PTR_ERR(file); | |
10350 | goto err; | |
10351 | } | |
10352 | ||
044c1ab3 JA |
10353 | /* |
10354 | * Install ring fd as the very last thing, so we don't risk someone | |
10355 | * having closed it before we finish setup | |
10356 | */ | |
9faadcc8 PB |
10357 | ret = io_uring_install_fd(ctx, file); |
10358 | if (ret < 0) { | |
10359 | /* fput will clean it up */ | |
10360 | fput(file); | |
10361 | return ret; | |
10362 | } | |
044c1ab3 | 10363 | |
c826bd7a | 10364 | trace_io_uring_create(ret, ctx, p->sq_entries, p->cq_entries, p->flags); |
2b188cc1 JA |
10365 | return ret; |
10366 | err: | |
10367 | io_ring_ctx_wait_and_kill(ctx); | |
10368 | return ret; | |
10369 | } | |
10370 | ||
10371 | /* | |
10372 | * Sets up an aio uring context, and returns the fd. Applications asks for a | |
10373 | * ring size, we return the actual sq/cq ring sizes (among other things) in the | |
10374 | * params structure passed in. | |
10375 | */ | |
10376 | static long io_uring_setup(u32 entries, struct io_uring_params __user *params) | |
10377 | { | |
10378 | struct io_uring_params p; | |
2b188cc1 JA |
10379 | int i; |
10380 | ||
10381 | if (copy_from_user(&p, params, sizeof(p))) | |
10382 | return -EFAULT; | |
10383 | for (i = 0; i < ARRAY_SIZE(p.resv); i++) { | |
10384 | if (p.resv[i]) | |
10385 | return -EINVAL; | |
10386 | } | |
10387 | ||
6c271ce2 | 10388 | if (p.flags & ~(IORING_SETUP_IOPOLL | IORING_SETUP_SQPOLL | |
8110c1a6 | 10389 | IORING_SETUP_SQ_AFF | IORING_SETUP_CQSIZE | |
7e84e1c7 SG |
10390 | IORING_SETUP_CLAMP | IORING_SETUP_ATTACH_WQ | |
10391 | IORING_SETUP_R_DISABLED)) | |
2b188cc1 JA |
10392 | return -EINVAL; |
10393 | ||
7f13657d | 10394 | return io_uring_create(entries, &p, params); |
2b188cc1 JA |
10395 | } |
10396 | ||
10397 | SYSCALL_DEFINE2(io_uring_setup, u32, entries, | |
10398 | struct io_uring_params __user *, params) | |
10399 | { | |
10400 | return io_uring_setup(entries, params); | |
10401 | } | |
10402 | ||
66f4af93 JA |
10403 | static int io_probe(struct io_ring_ctx *ctx, void __user *arg, unsigned nr_args) |
10404 | { | |
10405 | struct io_uring_probe *p; | |
10406 | size_t size; | |
10407 | int i, ret; | |
10408 | ||
10409 | size = struct_size(p, ops, nr_args); | |
10410 | if (size == SIZE_MAX) | |
10411 | return -EOVERFLOW; | |
10412 | p = kzalloc(size, GFP_KERNEL); | |
10413 | if (!p) | |
10414 | return -ENOMEM; | |
10415 | ||
10416 | ret = -EFAULT; | |
10417 | if (copy_from_user(p, arg, size)) | |
10418 | goto out; | |
10419 | ret = -EINVAL; | |
10420 | if (memchr_inv(p, 0, size)) | |
10421 | goto out; | |
10422 | ||
10423 | p->last_op = IORING_OP_LAST - 1; | |
10424 | if (nr_args > IORING_OP_LAST) | |
10425 | nr_args = IORING_OP_LAST; | |
10426 | ||
10427 | for (i = 0; i < nr_args; i++) { | |
10428 | p->ops[i].op = i; | |
10429 | if (!io_op_defs[i].not_supported) | |
10430 | p->ops[i].flags = IO_URING_OP_SUPPORTED; | |
10431 | } | |
10432 | p->ops_len = i; | |
10433 | ||
10434 | ret = 0; | |
10435 | if (copy_to_user(arg, p, size)) | |
10436 | ret = -EFAULT; | |
10437 | out: | |
10438 | kfree(p); | |
10439 | return ret; | |
10440 | } | |
10441 | ||
071698e1 JA |
10442 | static int io_register_personality(struct io_ring_ctx *ctx) |
10443 | { | |
4379bf8b | 10444 | const struct cred *creds; |
61cf9370 | 10445 | u32 id; |
1e6fa521 | 10446 | int ret; |
071698e1 | 10447 | |
4379bf8b | 10448 | creds = get_current_cred(); |
1e6fa521 | 10449 | |
61cf9370 MWO |
10450 | ret = xa_alloc_cyclic(&ctx->personalities, &id, (void *)creds, |
10451 | XA_LIMIT(0, USHRT_MAX), &ctx->pers_next, GFP_KERNEL); | |
a30f895a JA |
10452 | if (ret < 0) { |
10453 | put_cred(creds); | |
10454 | return ret; | |
10455 | } | |
10456 | return id; | |
071698e1 JA |
10457 | } |
10458 | ||
21b55dbc SG |
10459 | static int io_register_restrictions(struct io_ring_ctx *ctx, void __user *arg, |
10460 | unsigned int nr_args) | |
10461 | { | |
10462 | struct io_uring_restriction *res; | |
10463 | size_t size; | |
10464 | int i, ret; | |
10465 | ||
7e84e1c7 SG |
10466 | /* Restrictions allowed only if rings started disabled */ |
10467 | if (!(ctx->flags & IORING_SETUP_R_DISABLED)) | |
10468 | return -EBADFD; | |
10469 | ||
21b55dbc | 10470 | /* We allow only a single restrictions registration */ |
7e84e1c7 | 10471 | if (ctx->restrictions.registered) |
21b55dbc SG |
10472 | return -EBUSY; |
10473 | ||
10474 | if (!arg || nr_args > IORING_MAX_RESTRICTIONS) | |
10475 | return -EINVAL; | |
10476 | ||
10477 | size = array_size(nr_args, sizeof(*res)); | |
10478 | if (size == SIZE_MAX) | |
10479 | return -EOVERFLOW; | |
10480 | ||
10481 | res = memdup_user(arg, size); | |
10482 | if (IS_ERR(res)) | |
10483 | return PTR_ERR(res); | |
10484 | ||
10485 | ret = 0; | |
10486 | ||
10487 | for (i = 0; i < nr_args; i++) { | |
10488 | switch (res[i].opcode) { | |
10489 | case IORING_RESTRICTION_REGISTER_OP: | |
10490 | if (res[i].register_op >= IORING_REGISTER_LAST) { | |
10491 | ret = -EINVAL; | |
10492 | goto out; | |
10493 | } | |
10494 | ||
10495 | __set_bit(res[i].register_op, | |
10496 | ctx->restrictions.register_op); | |
10497 | break; | |
10498 | case IORING_RESTRICTION_SQE_OP: | |
10499 | if (res[i].sqe_op >= IORING_OP_LAST) { | |
10500 | ret = -EINVAL; | |
10501 | goto out; | |
10502 | } | |
10503 | ||
10504 | __set_bit(res[i].sqe_op, ctx->restrictions.sqe_op); | |
10505 | break; | |
10506 | case IORING_RESTRICTION_SQE_FLAGS_ALLOWED: | |
10507 | ctx->restrictions.sqe_flags_allowed = res[i].sqe_flags; | |
10508 | break; | |
10509 | case IORING_RESTRICTION_SQE_FLAGS_REQUIRED: | |
10510 | ctx->restrictions.sqe_flags_required = res[i].sqe_flags; | |
10511 | break; | |
10512 | default: | |
10513 | ret = -EINVAL; | |
10514 | goto out; | |
10515 | } | |
10516 | } | |
10517 | ||
10518 | out: | |
10519 | /* Reset all restrictions if an error happened */ | |
10520 | if (ret != 0) | |
10521 | memset(&ctx->restrictions, 0, sizeof(ctx->restrictions)); | |
10522 | else | |
7e84e1c7 | 10523 | ctx->restrictions.registered = true; |
21b55dbc SG |
10524 | |
10525 | kfree(res); | |
10526 | return ret; | |
10527 | } | |
10528 | ||
7e84e1c7 SG |
10529 | static int io_register_enable_rings(struct io_ring_ctx *ctx) |
10530 | { | |
10531 | if (!(ctx->flags & IORING_SETUP_R_DISABLED)) | |
10532 | return -EBADFD; | |
10533 | ||
10534 | if (ctx->restrictions.registered) | |
10535 | ctx->restricted = 1; | |
10536 | ||
0298ef96 PB |
10537 | ctx->flags &= ~IORING_SETUP_R_DISABLED; |
10538 | if (ctx->sq_data && wq_has_sleeper(&ctx->sq_data->wait)) | |
10539 | wake_up(&ctx->sq_data->wait); | |
7e84e1c7 SG |
10540 | return 0; |
10541 | } | |
10542 | ||
fdecb662 | 10543 | static int __io_register_rsrc_update(struct io_ring_ctx *ctx, unsigned type, |
c3bdad02 | 10544 | struct io_uring_rsrc_update2 *up, |
98f0b3b4 PB |
10545 | unsigned nr_args) |
10546 | { | |
10547 | __u32 tmp; | |
10548 | int err; | |
10549 | ||
c3bdad02 PB |
10550 | if (up->resv) |
10551 | return -EINVAL; | |
98f0b3b4 PB |
10552 | if (check_add_overflow(up->offset, nr_args, &tmp)) |
10553 | return -EOVERFLOW; | |
10554 | err = io_rsrc_node_switch_start(ctx); | |
10555 | if (err) | |
10556 | return err; | |
10557 | ||
fdecb662 PB |
10558 | switch (type) { |
10559 | case IORING_RSRC_FILE: | |
98f0b3b4 | 10560 | return __io_sqe_files_update(ctx, up, nr_args); |
634d00df PB |
10561 | case IORING_RSRC_BUFFER: |
10562 | return __io_sqe_buffers_update(ctx, up, nr_args); | |
98f0b3b4 PB |
10563 | } |
10564 | return -EINVAL; | |
10565 | } | |
10566 | ||
c3bdad02 PB |
10567 | static int io_register_files_update(struct io_ring_ctx *ctx, void __user *arg, |
10568 | unsigned nr_args) | |
98f0b3b4 | 10569 | { |
c3bdad02 | 10570 | struct io_uring_rsrc_update2 up; |
98f0b3b4 PB |
10571 | |
10572 | if (!nr_args) | |
10573 | return -EINVAL; | |
c3bdad02 PB |
10574 | memset(&up, 0, sizeof(up)); |
10575 | if (copy_from_user(&up, arg, sizeof(struct io_uring_rsrc_update))) | |
10576 | return -EFAULT; | |
10577 | return __io_register_rsrc_update(ctx, IORING_RSRC_FILE, &up, nr_args); | |
10578 | } | |
10579 | ||
10580 | static int io_register_rsrc_update(struct io_ring_ctx *ctx, void __user *arg, | |
992da01a | 10581 | unsigned size, unsigned type) |
c3bdad02 PB |
10582 | { |
10583 | struct io_uring_rsrc_update2 up; | |
10584 | ||
10585 | if (size != sizeof(up)) | |
10586 | return -EINVAL; | |
98f0b3b4 PB |
10587 | if (copy_from_user(&up, arg, sizeof(up))) |
10588 | return -EFAULT; | |
992da01a | 10589 | if (!up.nr || up.resv) |
98f0b3b4 | 10590 | return -EINVAL; |
992da01a | 10591 | return __io_register_rsrc_update(ctx, type, &up, up.nr); |
98f0b3b4 PB |
10592 | } |
10593 | ||
792e3582 | 10594 | static int io_register_rsrc(struct io_ring_ctx *ctx, void __user *arg, |
992da01a | 10595 | unsigned int size, unsigned int type) |
792e3582 PB |
10596 | { |
10597 | struct io_uring_rsrc_register rr; | |
10598 | ||
10599 | /* keep it extendible */ | |
10600 | if (size != sizeof(rr)) | |
10601 | return -EINVAL; | |
10602 | ||
10603 | memset(&rr, 0, sizeof(rr)); | |
10604 | if (copy_from_user(&rr, arg, size)) | |
10605 | return -EFAULT; | |
992da01a | 10606 | if (!rr.nr || rr.resv || rr.resv2) |
792e3582 PB |
10607 | return -EINVAL; |
10608 | ||
992da01a | 10609 | switch (type) { |
792e3582 PB |
10610 | case IORING_RSRC_FILE: |
10611 | return io_sqe_files_register(ctx, u64_to_user_ptr(rr.data), | |
10612 | rr.nr, u64_to_user_ptr(rr.tags)); | |
634d00df PB |
10613 | case IORING_RSRC_BUFFER: |
10614 | return io_sqe_buffers_register(ctx, u64_to_user_ptr(rr.data), | |
10615 | rr.nr, u64_to_user_ptr(rr.tags)); | |
792e3582 PB |
10616 | } |
10617 | return -EINVAL; | |
10618 | } | |
10619 | ||
fe76421d JA |
10620 | static int io_register_iowq_aff(struct io_ring_ctx *ctx, void __user *arg, |
10621 | unsigned len) | |
10622 | { | |
10623 | struct io_uring_task *tctx = current->io_uring; | |
10624 | cpumask_var_t new_mask; | |
10625 | int ret; | |
10626 | ||
10627 | if (!tctx || !tctx->io_wq) | |
10628 | return -EINVAL; | |
10629 | ||
10630 | if (!alloc_cpumask_var(&new_mask, GFP_KERNEL)) | |
10631 | return -ENOMEM; | |
10632 | ||
10633 | cpumask_clear(new_mask); | |
10634 | if (len > cpumask_size()) | |
10635 | len = cpumask_size(); | |
10636 | ||
10637 | if (copy_from_user(new_mask, arg, len)) { | |
10638 | free_cpumask_var(new_mask); | |
10639 | return -EFAULT; | |
10640 | } | |
10641 | ||
10642 | ret = io_wq_cpu_affinity(tctx->io_wq, new_mask); | |
10643 | free_cpumask_var(new_mask); | |
10644 | return ret; | |
10645 | } | |
10646 | ||
10647 | static int io_unregister_iowq_aff(struct io_ring_ctx *ctx) | |
10648 | { | |
10649 | struct io_uring_task *tctx = current->io_uring; | |
10650 | ||
10651 | if (!tctx || !tctx->io_wq) | |
10652 | return -EINVAL; | |
10653 | ||
10654 | return io_wq_cpu_affinity(tctx->io_wq, NULL); | |
10655 | } | |
10656 | ||
2e480058 JA |
10657 | static int io_register_iowq_max_workers(struct io_ring_ctx *ctx, |
10658 | void __user *arg) | |
10659 | { | |
fa84693b JA |
10660 | struct io_uring_task *tctx = NULL; |
10661 | struct io_sq_data *sqd = NULL; | |
2e480058 JA |
10662 | __u32 new_count[2]; |
10663 | int i, ret; | |
10664 | ||
2e480058 JA |
10665 | if (copy_from_user(new_count, arg, sizeof(new_count))) |
10666 | return -EFAULT; | |
10667 | for (i = 0; i < ARRAY_SIZE(new_count); i++) | |
10668 | if (new_count[i] > INT_MAX) | |
10669 | return -EINVAL; | |
10670 | ||
fa84693b JA |
10671 | if (ctx->flags & IORING_SETUP_SQPOLL) { |
10672 | sqd = ctx->sq_data; | |
10673 | if (sqd) { | |
009ad9f0 JA |
10674 | /* |
10675 | * Observe the correct sqd->lock -> ctx->uring_lock | |
10676 | * ordering. Fine to drop uring_lock here, we hold | |
10677 | * a ref to the ctx. | |
10678 | */ | |
41d3a6bd | 10679 | refcount_inc(&sqd->refs); |
009ad9f0 | 10680 | mutex_unlock(&ctx->uring_lock); |
fa84693b | 10681 | mutex_lock(&sqd->lock); |
009ad9f0 | 10682 | mutex_lock(&ctx->uring_lock); |
41d3a6bd JA |
10683 | if (sqd->thread) |
10684 | tctx = sqd->thread->io_uring; | |
fa84693b JA |
10685 | } |
10686 | } else { | |
10687 | tctx = current->io_uring; | |
10688 | } | |
10689 | ||
10690 | ret = -EINVAL; | |
10691 | if (!tctx || !tctx->io_wq) | |
10692 | goto err; | |
10693 | ||
2e480058 JA |
10694 | ret = io_wq_max_workers(tctx->io_wq, new_count); |
10695 | if (ret) | |
fa84693b JA |
10696 | goto err; |
10697 | ||
41d3a6bd | 10698 | if (sqd) { |
fa84693b | 10699 | mutex_unlock(&sqd->lock); |
41d3a6bd JA |
10700 | io_put_sq_data(sqd); |
10701 | } | |
2e480058 JA |
10702 | |
10703 | if (copy_to_user(arg, new_count, sizeof(new_count))) | |
10704 | return -EFAULT; | |
10705 | ||
10706 | return 0; | |
fa84693b | 10707 | err: |
41d3a6bd | 10708 | if (sqd) { |
fa84693b | 10709 | mutex_unlock(&sqd->lock); |
41d3a6bd JA |
10710 | io_put_sq_data(sqd); |
10711 | } | |
fa84693b | 10712 | return ret; |
2e480058 JA |
10713 | } |
10714 | ||
071698e1 JA |
10715 | static bool io_register_op_must_quiesce(int op) |
10716 | { | |
10717 | switch (op) { | |
bd54b6fe BM |
10718 | case IORING_REGISTER_BUFFERS: |
10719 | case IORING_UNREGISTER_BUFFERS: | |
f4f7d21c | 10720 | case IORING_REGISTER_FILES: |
071698e1 JA |
10721 | case IORING_UNREGISTER_FILES: |
10722 | case IORING_REGISTER_FILES_UPDATE: | |
10723 | case IORING_REGISTER_PROBE: | |
10724 | case IORING_REGISTER_PERSONALITY: | |
10725 | case IORING_UNREGISTER_PERSONALITY: | |
992da01a PB |
10726 | case IORING_REGISTER_FILES2: |
10727 | case IORING_REGISTER_FILES_UPDATE2: | |
10728 | case IORING_REGISTER_BUFFERS2: | |
10729 | case IORING_REGISTER_BUFFERS_UPDATE: | |
fe76421d JA |
10730 | case IORING_REGISTER_IOWQ_AFF: |
10731 | case IORING_UNREGISTER_IOWQ_AFF: | |
2e480058 | 10732 | case IORING_REGISTER_IOWQ_MAX_WORKERS: |
071698e1 JA |
10733 | return false; |
10734 | default: | |
10735 | return true; | |
10736 | } | |
10737 | } | |
10738 | ||
e73c5c7c PB |
10739 | static int io_ctx_quiesce(struct io_ring_ctx *ctx) |
10740 | { | |
10741 | long ret; | |
10742 | ||
10743 | percpu_ref_kill(&ctx->refs); | |
10744 | ||
10745 | /* | |
10746 | * Drop uring mutex before waiting for references to exit. If another | |
10747 | * thread is currently inside io_uring_enter() it might need to grab the | |
10748 | * uring_lock to make progress. If we hold it here across the drain | |
10749 | * wait, then we can deadlock. It's safe to drop the mutex here, since | |
10750 | * no new references will come in after we've killed the percpu ref. | |
10751 | */ | |
10752 | mutex_unlock(&ctx->uring_lock); | |
10753 | do { | |
10754 | ret = wait_for_completion_interruptible(&ctx->ref_comp); | |
10755 | if (!ret) | |
10756 | break; | |
10757 | ret = io_run_task_work_sig(); | |
10758 | } while (ret >= 0); | |
10759 | mutex_lock(&ctx->uring_lock); | |
10760 | ||
10761 | if (ret) | |
10762 | io_refs_resurrect(&ctx->refs, &ctx->ref_comp); | |
10763 | return ret; | |
10764 | } | |
10765 | ||
edafccee JA |
10766 | static int __io_uring_register(struct io_ring_ctx *ctx, unsigned opcode, |
10767 | void __user *arg, unsigned nr_args) | |
b19062a5 JA |
10768 | __releases(ctx->uring_lock) |
10769 | __acquires(ctx->uring_lock) | |
edafccee JA |
10770 | { |
10771 | int ret; | |
10772 | ||
35fa71a0 JA |
10773 | /* |
10774 | * We're inside the ring mutex, if the ref is already dying, then | |
10775 | * someone else killed the ctx or is already going through | |
10776 | * io_uring_register(). | |
10777 | */ | |
10778 | if (percpu_ref_is_dying(&ctx->refs)) | |
10779 | return -ENXIO; | |
10780 | ||
75c4021a PB |
10781 | if (ctx->restricted) { |
10782 | if (opcode >= IORING_REGISTER_LAST) | |
10783 | return -EINVAL; | |
10784 | opcode = array_index_nospec(opcode, IORING_REGISTER_LAST); | |
10785 | if (!test_bit(opcode, ctx->restrictions.register_op)) | |
10786 | return -EACCES; | |
10787 | } | |
10788 | ||
071698e1 | 10789 | if (io_register_op_must_quiesce(opcode)) { |
e73c5c7c PB |
10790 | ret = io_ctx_quiesce(ctx); |
10791 | if (ret) | |
f70865db | 10792 | return ret; |
05f3fb3c | 10793 | } |
edafccee JA |
10794 | |
10795 | switch (opcode) { | |
10796 | case IORING_REGISTER_BUFFERS: | |
634d00df | 10797 | ret = io_sqe_buffers_register(ctx, arg, nr_args, NULL); |
edafccee JA |
10798 | break; |
10799 | case IORING_UNREGISTER_BUFFERS: | |
10800 | ret = -EINVAL; | |
10801 | if (arg || nr_args) | |
10802 | break; | |
0a96bbe4 | 10803 | ret = io_sqe_buffers_unregister(ctx); |
edafccee | 10804 | break; |
6b06314c | 10805 | case IORING_REGISTER_FILES: |
792e3582 | 10806 | ret = io_sqe_files_register(ctx, arg, nr_args, NULL); |
6b06314c JA |
10807 | break; |
10808 | case IORING_UNREGISTER_FILES: | |
10809 | ret = -EINVAL; | |
10810 | if (arg || nr_args) | |
10811 | break; | |
10812 | ret = io_sqe_files_unregister(ctx); | |
10813 | break; | |
c3a31e60 | 10814 | case IORING_REGISTER_FILES_UPDATE: |
c3bdad02 | 10815 | ret = io_register_files_update(ctx, arg, nr_args); |
c3a31e60 | 10816 | break; |
9b402849 | 10817 | case IORING_REGISTER_EVENTFD: |
f2842ab5 | 10818 | case IORING_REGISTER_EVENTFD_ASYNC: |
9b402849 JA |
10819 | ret = -EINVAL; |
10820 | if (nr_args != 1) | |
10821 | break; | |
10822 | ret = io_eventfd_register(ctx, arg); | |
f2842ab5 JA |
10823 | if (ret) |
10824 | break; | |
10825 | if (opcode == IORING_REGISTER_EVENTFD_ASYNC) | |
10826 | ctx->eventfd_async = 1; | |
10827 | else | |
10828 | ctx->eventfd_async = 0; | |
9b402849 JA |
10829 | break; |
10830 | case IORING_UNREGISTER_EVENTFD: | |
10831 | ret = -EINVAL; | |
10832 | if (arg || nr_args) | |
10833 | break; | |
10834 | ret = io_eventfd_unregister(ctx); | |
10835 | break; | |
66f4af93 JA |
10836 | case IORING_REGISTER_PROBE: |
10837 | ret = -EINVAL; | |
10838 | if (!arg || nr_args > 256) | |
10839 | break; | |
10840 | ret = io_probe(ctx, arg, nr_args); | |
10841 | break; | |
071698e1 JA |
10842 | case IORING_REGISTER_PERSONALITY: |
10843 | ret = -EINVAL; | |
10844 | if (arg || nr_args) | |
10845 | break; | |
10846 | ret = io_register_personality(ctx); | |
10847 | break; | |
10848 | case IORING_UNREGISTER_PERSONALITY: | |
10849 | ret = -EINVAL; | |
10850 | if (arg) | |
10851 | break; | |
10852 | ret = io_unregister_personality(ctx, nr_args); | |
10853 | break; | |
7e84e1c7 SG |
10854 | case IORING_REGISTER_ENABLE_RINGS: |
10855 | ret = -EINVAL; | |
10856 | if (arg || nr_args) | |
10857 | break; | |
10858 | ret = io_register_enable_rings(ctx); | |
10859 | break; | |
21b55dbc SG |
10860 | case IORING_REGISTER_RESTRICTIONS: |
10861 | ret = io_register_restrictions(ctx, arg, nr_args); | |
10862 | break; | |
992da01a PB |
10863 | case IORING_REGISTER_FILES2: |
10864 | ret = io_register_rsrc(ctx, arg, nr_args, IORING_RSRC_FILE); | |
10865 | break; | |
10866 | case IORING_REGISTER_FILES_UPDATE2: | |
10867 | ret = io_register_rsrc_update(ctx, arg, nr_args, | |
10868 | IORING_RSRC_FILE); | |
10869 | break; | |
10870 | case IORING_REGISTER_BUFFERS2: | |
10871 | ret = io_register_rsrc(ctx, arg, nr_args, IORING_RSRC_BUFFER); | |
792e3582 | 10872 | break; |
992da01a PB |
10873 | case IORING_REGISTER_BUFFERS_UPDATE: |
10874 | ret = io_register_rsrc_update(ctx, arg, nr_args, | |
10875 | IORING_RSRC_BUFFER); | |
c3bdad02 | 10876 | break; |
fe76421d JA |
10877 | case IORING_REGISTER_IOWQ_AFF: |
10878 | ret = -EINVAL; | |
10879 | if (!arg || !nr_args) | |
10880 | break; | |
10881 | ret = io_register_iowq_aff(ctx, arg, nr_args); | |
10882 | break; | |
10883 | case IORING_UNREGISTER_IOWQ_AFF: | |
10884 | ret = -EINVAL; | |
10885 | if (arg || nr_args) | |
10886 | break; | |
10887 | ret = io_unregister_iowq_aff(ctx); | |
10888 | break; | |
2e480058 JA |
10889 | case IORING_REGISTER_IOWQ_MAX_WORKERS: |
10890 | ret = -EINVAL; | |
10891 | if (!arg || nr_args != 2) | |
10892 | break; | |
10893 | ret = io_register_iowq_max_workers(ctx, arg); | |
10894 | break; | |
edafccee JA |
10895 | default: |
10896 | ret = -EINVAL; | |
10897 | break; | |
10898 | } | |
10899 | ||
071698e1 | 10900 | if (io_register_op_must_quiesce(opcode)) { |
05f3fb3c | 10901 | /* bring the ctx back to life */ |
05f3fb3c | 10902 | percpu_ref_reinit(&ctx->refs); |
0f158b4c | 10903 | reinit_completion(&ctx->ref_comp); |
05f3fb3c | 10904 | } |
edafccee JA |
10905 | return ret; |
10906 | } | |
10907 | ||
10908 | SYSCALL_DEFINE4(io_uring_register, unsigned int, fd, unsigned int, opcode, | |
10909 | void __user *, arg, unsigned int, nr_args) | |
10910 | { | |
10911 | struct io_ring_ctx *ctx; | |
10912 | long ret = -EBADF; | |
10913 | struct fd f; | |
10914 | ||
10915 | f = fdget(fd); | |
10916 | if (!f.file) | |
10917 | return -EBADF; | |
10918 | ||
10919 | ret = -EOPNOTSUPP; | |
10920 | if (f.file->f_op != &io_uring_fops) | |
10921 | goto out_fput; | |
10922 | ||
10923 | ctx = f.file->private_data; | |
10924 | ||
b6c23dd5 PB |
10925 | io_run_task_work(); |
10926 | ||
edafccee JA |
10927 | mutex_lock(&ctx->uring_lock); |
10928 | ret = __io_uring_register(ctx, opcode, arg, nr_args); | |
10929 | mutex_unlock(&ctx->uring_lock); | |
c826bd7a DD |
10930 | trace_io_uring_register(ctx, opcode, ctx->nr_user_files, ctx->nr_user_bufs, |
10931 | ctx->cq_ev_fd != NULL, ret); | |
edafccee JA |
10932 | out_fput: |
10933 | fdput(f); | |
10934 | return ret; | |
10935 | } | |
10936 | ||
2b188cc1 JA |
10937 | static int __init io_uring_init(void) |
10938 | { | |
d7f62e82 SM |
10939 | #define __BUILD_BUG_VERIFY_ELEMENT(stype, eoffset, etype, ename) do { \ |
10940 | BUILD_BUG_ON(offsetof(stype, ename) != eoffset); \ | |
10941 | BUILD_BUG_ON(sizeof(etype) != sizeof_field(stype, ename)); \ | |
10942 | } while (0) | |
10943 | ||
10944 | #define BUILD_BUG_SQE_ELEM(eoffset, etype, ename) \ | |
10945 | __BUILD_BUG_VERIFY_ELEMENT(struct io_uring_sqe, eoffset, etype, ename) | |
10946 | BUILD_BUG_ON(sizeof(struct io_uring_sqe) != 64); | |
10947 | BUILD_BUG_SQE_ELEM(0, __u8, opcode); | |
10948 | BUILD_BUG_SQE_ELEM(1, __u8, flags); | |
10949 | BUILD_BUG_SQE_ELEM(2, __u16, ioprio); | |
10950 | BUILD_BUG_SQE_ELEM(4, __s32, fd); | |
10951 | BUILD_BUG_SQE_ELEM(8, __u64, off); | |
10952 | BUILD_BUG_SQE_ELEM(8, __u64, addr2); | |
10953 | BUILD_BUG_SQE_ELEM(16, __u64, addr); | |
7d67af2c | 10954 | BUILD_BUG_SQE_ELEM(16, __u64, splice_off_in); |
d7f62e82 SM |
10955 | BUILD_BUG_SQE_ELEM(24, __u32, len); |
10956 | BUILD_BUG_SQE_ELEM(28, __kernel_rwf_t, rw_flags); | |
10957 | BUILD_BUG_SQE_ELEM(28, /* compat */ int, rw_flags); | |
10958 | BUILD_BUG_SQE_ELEM(28, /* compat */ __u32, rw_flags); | |
10959 | BUILD_BUG_SQE_ELEM(28, __u32, fsync_flags); | |
5769a351 JX |
10960 | BUILD_BUG_SQE_ELEM(28, /* compat */ __u16, poll_events); |
10961 | BUILD_BUG_SQE_ELEM(28, __u32, poll32_events); | |
d7f62e82 SM |
10962 | BUILD_BUG_SQE_ELEM(28, __u32, sync_range_flags); |
10963 | BUILD_BUG_SQE_ELEM(28, __u32, msg_flags); | |
10964 | BUILD_BUG_SQE_ELEM(28, __u32, timeout_flags); | |
10965 | BUILD_BUG_SQE_ELEM(28, __u32, accept_flags); | |
10966 | BUILD_BUG_SQE_ELEM(28, __u32, cancel_flags); | |
10967 | BUILD_BUG_SQE_ELEM(28, __u32, open_flags); | |
10968 | BUILD_BUG_SQE_ELEM(28, __u32, statx_flags); | |
10969 | BUILD_BUG_SQE_ELEM(28, __u32, fadvise_advice); | |
7d67af2c | 10970 | BUILD_BUG_SQE_ELEM(28, __u32, splice_flags); |
d7f62e82 SM |
10971 | BUILD_BUG_SQE_ELEM(32, __u64, user_data); |
10972 | BUILD_BUG_SQE_ELEM(40, __u16, buf_index); | |
16340eab | 10973 | BUILD_BUG_SQE_ELEM(40, __u16, buf_group); |
d7f62e82 | 10974 | BUILD_BUG_SQE_ELEM(42, __u16, personality); |
7d67af2c | 10975 | BUILD_BUG_SQE_ELEM(44, __s32, splice_fd_in); |
b9445598 | 10976 | BUILD_BUG_SQE_ELEM(44, __u32, file_index); |
d7f62e82 | 10977 | |
b0d658ec PB |
10978 | BUILD_BUG_ON(sizeof(struct io_uring_files_update) != |
10979 | sizeof(struct io_uring_rsrc_update)); | |
10980 | BUILD_BUG_ON(sizeof(struct io_uring_rsrc_update) > | |
10981 | sizeof(struct io_uring_rsrc_update2)); | |
90499ad0 PB |
10982 | |
10983 | /* ->buf_index is u16 */ | |
10984 | BUILD_BUG_ON(IORING_MAX_REG_BUFFERS >= (1u << 16)); | |
10985 | ||
b0d658ec PB |
10986 | /* should fit into one byte */ |
10987 | BUILD_BUG_ON(SQE_VALID_FLAGS >= (1 << 8)); | |
10988 | ||
d3656344 | 10989 | BUILD_BUG_ON(ARRAY_SIZE(io_op_defs) != IORING_OP_LAST); |
32c2d33e | 10990 | BUILD_BUG_ON(__REQ_F_LAST_BIT > 8 * sizeof(int)); |
16340eab | 10991 | |
91f245d5 JA |
10992 | req_cachep = KMEM_CACHE(io_kiocb, SLAB_HWCACHE_ALIGN | SLAB_PANIC | |
10993 | SLAB_ACCOUNT); | |
2b188cc1 JA |
10994 | return 0; |
10995 | }; | |
10996 | __initcall(io_uring_init); |