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2b188cc1 JA |
1 | // SPDX-License-Identifier: GPL-2.0 |
2 | /* | |
3 | * Shared application/kernel submission and completion ring pairs, for | |
4 | * supporting fast/efficient IO. | |
5 | * | |
6 | * A note on the read/write ordering memory barriers that are matched between | |
1e84b97b SB |
7 | * the application and kernel side. |
8 | * | |
9 | * After the application reads the CQ ring tail, it must use an | |
10 | * appropriate smp_rmb() to pair with the smp_wmb() the kernel uses | |
11 | * before writing the tail (using smp_load_acquire to read the tail will | |
12 | * do). It also needs a smp_mb() before updating CQ head (ordering the | |
13 | * entry load(s) with the head store), pairing with an implicit barrier | |
d068b506 | 14 | * through a control-dependency in io_get_cqe (smp_store_release to |
1e84b97b SB |
15 | * store head will do). Failure to do so could lead to reading invalid |
16 | * CQ entries. | |
17 | * | |
18 | * Likewise, the application must use an appropriate smp_wmb() before | |
19 | * writing the SQ tail (ordering SQ entry stores with the tail store), | |
20 | * which pairs with smp_load_acquire in io_get_sqring (smp_store_release | |
21 | * to store the tail will do). And it needs a barrier ordering the SQ | |
22 | * head load before writing new SQ entries (smp_load_acquire to read | |
23 | * head will do). | |
24 | * | |
25 | * When using the SQ poll thread (IORING_SETUP_SQPOLL), the application | |
26 | * needs to check the SQ flags for IORING_SQ_NEED_WAKEUP *after* | |
27 | * updating the SQ tail; a full memory barrier smp_mb() is needed | |
28 | * between. | |
2b188cc1 JA |
29 | * |
30 | * Also see the examples in the liburing library: | |
31 | * | |
32 | * git://git.kernel.dk/liburing | |
33 | * | |
34 | * io_uring also uses READ/WRITE_ONCE() for _any_ store or load that happens | |
35 | * from data shared between the kernel and application. This is done both | |
36 | * for ordering purposes, but also to ensure that once a value is loaded from | |
37 | * data that the application could potentially modify, it remains stable. | |
38 | * | |
39 | * Copyright (C) 2018-2019 Jens Axboe | |
c992fe29 | 40 | * Copyright (c) 2018-2019 Christoph Hellwig |
2b188cc1 JA |
41 | */ |
42 | #include <linux/kernel.h> | |
43 | #include <linux/init.h> | |
44 | #include <linux/errno.h> | |
45 | #include <linux/syscalls.h> | |
46 | #include <linux/compat.h> | |
52de1fe1 | 47 | #include <net/compat.h> |
2b188cc1 JA |
48 | #include <linux/refcount.h> |
49 | #include <linux/uio.h> | |
6b47ee6e | 50 | #include <linux/bits.h> |
2b188cc1 JA |
51 | |
52 | #include <linux/sched/signal.h> | |
53 | #include <linux/fs.h> | |
54 | #include <linux/file.h> | |
55 | #include <linux/fdtable.h> | |
56 | #include <linux/mm.h> | |
57 | #include <linux/mman.h> | |
2b188cc1 JA |
58 | #include <linux/percpu.h> |
59 | #include <linux/slab.h> | |
2b188cc1 | 60 | #include <linux/blkdev.h> |
edafccee | 61 | #include <linux/bvec.h> |
2b188cc1 JA |
62 | #include <linux/net.h> |
63 | #include <net/sock.h> | |
64 | #include <net/af_unix.h> | |
6b06314c | 65 | #include <net/scm.h> |
2b188cc1 JA |
66 | #include <linux/anon_inodes.h> |
67 | #include <linux/sched/mm.h> | |
68 | #include <linux/uaccess.h> | |
69 | #include <linux/nospec.h> | |
edafccee JA |
70 | #include <linux/sizes.h> |
71 | #include <linux/hugetlb.h> | |
aa4c3967 | 72 | #include <linux/highmem.h> |
15b71abe JA |
73 | #include <linux/namei.h> |
74 | #include <linux/fsnotify.h> | |
4840e418 | 75 | #include <linux/fadvise.h> |
3e4827b0 | 76 | #include <linux/eventpoll.h> |
7d67af2c | 77 | #include <linux/splice.h> |
b41e9852 | 78 | #include <linux/task_work.h> |
bcf5a063 | 79 | #include <linux/pagemap.h> |
0f212204 | 80 | #include <linux/io_uring.h> |
ef98eb04 | 81 | #include <linux/tracehook.h> |
2b188cc1 | 82 | |
c826bd7a DD |
83 | #define CREATE_TRACE_POINTS |
84 | #include <trace/events/io_uring.h> | |
85 | ||
2b188cc1 JA |
86 | #include <uapi/linux/io_uring.h> |
87 | ||
88 | #include "internal.h" | |
561fb04a | 89 | #include "io-wq.h" |
2b188cc1 | 90 | |
5277deaa | 91 | #define IORING_MAX_ENTRIES 32768 |
33a107f0 | 92 | #define IORING_MAX_CQ_ENTRIES (2 * IORING_MAX_ENTRIES) |
4ce8ad95 | 93 | #define IORING_SQPOLL_CAP_ENTRIES_VALUE 8 |
65e19f54 | 94 | |
042b0d85 PB |
95 | /* 512 entries per page on 64-bit archs, 64 pages max */ |
96 | #define IORING_MAX_FIXED_FILES (1U << 15) | |
21b55dbc SG |
97 | #define IORING_MAX_RESTRICTIONS (IORING_RESTRICTION_LAST + \ |
98 | IORING_REGISTER_LAST + IORING_OP_LAST) | |
2b188cc1 | 99 | |
2d091d62 PB |
100 | #define IO_RSRC_TAG_TABLE_SHIFT 9 |
101 | #define IO_RSRC_TAG_TABLE_MAX (1U << IO_RSRC_TAG_TABLE_SHIFT) | |
102 | #define IO_RSRC_TAG_TABLE_MASK (IO_RSRC_TAG_TABLE_MAX - 1) | |
103 | ||
489809e2 PB |
104 | #define IORING_MAX_REG_BUFFERS (1U << 14) |
105 | ||
b16fed66 PB |
106 | #define SQE_VALID_FLAGS (IOSQE_FIXED_FILE|IOSQE_IO_DRAIN|IOSQE_IO_LINK| \ |
107 | IOSQE_IO_HARDLINK | IOSQE_ASYNC | \ | |
108 | IOSQE_BUFFER_SELECT) | |
c854357b PB |
109 | #define IO_REQ_CLEAN_FLAGS (REQ_F_BUFFER_SELECTED | REQ_F_NEED_CLEANUP | \ |
110 | REQ_F_POLLED | REQ_F_INFLIGHT | REQ_F_CREDS) | |
b16fed66 | 111 | |
09899b19 PB |
112 | #define IO_TCTX_REFS_CACHE_NR (1U << 10) |
113 | ||
2b188cc1 JA |
114 | struct io_uring { |
115 | u32 head ____cacheline_aligned_in_smp; | |
116 | u32 tail ____cacheline_aligned_in_smp; | |
117 | }; | |
118 | ||
1e84b97b | 119 | /* |
75b28aff HV |
120 | * This data is shared with the application through the mmap at offsets |
121 | * IORING_OFF_SQ_RING and IORING_OFF_CQ_RING. | |
1e84b97b SB |
122 | * |
123 | * The offsets to the member fields are published through struct | |
124 | * io_sqring_offsets when calling io_uring_setup. | |
125 | */ | |
75b28aff | 126 | struct io_rings { |
1e84b97b SB |
127 | /* |
128 | * Head and tail offsets into the ring; the offsets need to be | |
129 | * masked to get valid indices. | |
130 | * | |
75b28aff HV |
131 | * The kernel controls head of the sq ring and the tail of the cq ring, |
132 | * and the application controls tail of the sq ring and the head of the | |
133 | * cq ring. | |
1e84b97b | 134 | */ |
75b28aff | 135 | struct io_uring sq, cq; |
1e84b97b | 136 | /* |
75b28aff | 137 | * Bitmasks to apply to head and tail offsets (constant, equals |
1e84b97b SB |
138 | * ring_entries - 1) |
139 | */ | |
75b28aff HV |
140 | u32 sq_ring_mask, cq_ring_mask; |
141 | /* Ring sizes (constant, power of 2) */ | |
142 | u32 sq_ring_entries, cq_ring_entries; | |
1e84b97b SB |
143 | /* |
144 | * Number of invalid entries dropped by the kernel due to | |
145 | * invalid index stored in array | |
146 | * | |
147 | * Written by the kernel, shouldn't be modified by the | |
148 | * application (i.e. get number of "new events" by comparing to | |
149 | * cached value). | |
150 | * | |
151 | * After a new SQ head value was read by the application this | |
152 | * counter includes all submissions that were dropped reaching | |
153 | * the new SQ head (and possibly more). | |
154 | */ | |
75b28aff | 155 | u32 sq_dropped; |
1e84b97b | 156 | /* |
0d9b5b3a | 157 | * Runtime SQ flags |
1e84b97b SB |
158 | * |
159 | * Written by the kernel, shouldn't be modified by the | |
160 | * application. | |
161 | * | |
162 | * The application needs a full memory barrier before checking | |
163 | * for IORING_SQ_NEED_WAKEUP after updating the sq tail. | |
164 | */ | |
75b28aff | 165 | u32 sq_flags; |
0d9b5b3a SG |
166 | /* |
167 | * Runtime CQ flags | |
168 | * | |
169 | * Written by the application, shouldn't be modified by the | |
170 | * kernel. | |
171 | */ | |
fe7e3257 | 172 | u32 cq_flags; |
1e84b97b SB |
173 | /* |
174 | * Number of completion events lost because the queue was full; | |
175 | * this should be avoided by the application by making sure | |
0b4295b5 | 176 | * there are not more requests pending than there is space in |
1e84b97b SB |
177 | * the completion queue. |
178 | * | |
179 | * Written by the kernel, shouldn't be modified by the | |
180 | * application (i.e. get number of "new events" by comparing to | |
181 | * cached value). | |
182 | * | |
183 | * As completion events come in out of order this counter is not | |
184 | * ordered with any other data. | |
185 | */ | |
75b28aff | 186 | u32 cq_overflow; |
1e84b97b SB |
187 | /* |
188 | * Ring buffer of completion events. | |
189 | * | |
190 | * The kernel writes completion events fresh every time they are | |
191 | * produced, so the application is allowed to modify pending | |
192 | * entries. | |
193 | */ | |
75b28aff | 194 | struct io_uring_cqe cqes[] ____cacheline_aligned_in_smp; |
2b188cc1 JA |
195 | }; |
196 | ||
45d189c6 PB |
197 | enum io_uring_cmd_flags { |
198 | IO_URING_F_NONBLOCK = 1, | |
889fca73 | 199 | IO_URING_F_COMPLETE_DEFER = 2, |
45d189c6 PB |
200 | }; |
201 | ||
edafccee JA |
202 | struct io_mapped_ubuf { |
203 | u64 ubuf; | |
4751f53d | 204 | u64 ubuf_end; |
edafccee | 205 | unsigned int nr_bvecs; |
de293938 | 206 | unsigned long acct_pages; |
41edf1a5 | 207 | struct bio_vec bvec[]; |
edafccee JA |
208 | }; |
209 | ||
50238531 BM |
210 | struct io_ring_ctx; |
211 | ||
6c2450ae PB |
212 | struct io_overflow_cqe { |
213 | struct io_uring_cqe cqe; | |
214 | struct list_head list; | |
215 | }; | |
216 | ||
a04b0ac0 PB |
217 | struct io_fixed_file { |
218 | /* file * with additional FFS_* flags */ | |
219 | unsigned long file_ptr; | |
220 | }; | |
221 | ||
269bbe5f BM |
222 | struct io_rsrc_put { |
223 | struct list_head list; | |
b60c8dce | 224 | u64 tag; |
50238531 BM |
225 | union { |
226 | void *rsrc; | |
227 | struct file *file; | |
bd54b6fe | 228 | struct io_mapped_ubuf *buf; |
50238531 | 229 | }; |
269bbe5f BM |
230 | }; |
231 | ||
aeca241b | 232 | struct io_file_table { |
042b0d85 | 233 | struct io_fixed_file *files; |
31b51510 JA |
234 | }; |
235 | ||
b895c9a6 | 236 | struct io_rsrc_node { |
05589553 XW |
237 | struct percpu_ref refs; |
238 | struct list_head node; | |
269bbe5f | 239 | struct list_head rsrc_list; |
b895c9a6 | 240 | struct io_rsrc_data *rsrc_data; |
4a38aed2 | 241 | struct llist_node llist; |
e297822b | 242 | bool done; |
05589553 XW |
243 | }; |
244 | ||
40ae0ff7 PB |
245 | typedef void (rsrc_put_fn)(struct io_ring_ctx *ctx, struct io_rsrc_put *prsrc); |
246 | ||
b895c9a6 | 247 | struct io_rsrc_data { |
05f3fb3c JA |
248 | struct io_ring_ctx *ctx; |
249 | ||
2d091d62 PB |
250 | u64 **tags; |
251 | unsigned int nr; | |
40ae0ff7 | 252 | rsrc_put_fn *do_put; |
3e942498 | 253 | atomic_t refs; |
05f3fb3c | 254 | struct completion done; |
8bad28d8 | 255 | bool quiesce; |
05f3fb3c JA |
256 | }; |
257 | ||
5a2e745d JA |
258 | struct io_buffer { |
259 | struct list_head list; | |
260 | __u64 addr; | |
d1f82808 | 261 | __u32 len; |
5a2e745d JA |
262 | __u16 bid; |
263 | }; | |
264 | ||
21b55dbc SG |
265 | struct io_restriction { |
266 | DECLARE_BITMAP(register_op, IORING_REGISTER_LAST); | |
267 | DECLARE_BITMAP(sqe_op, IORING_OP_LAST); | |
268 | u8 sqe_flags_allowed; | |
269 | u8 sqe_flags_required; | |
7e84e1c7 | 270 | bool registered; |
21b55dbc SG |
271 | }; |
272 | ||
37d1e2e3 JA |
273 | enum { |
274 | IO_SQ_THREAD_SHOULD_STOP = 0, | |
275 | IO_SQ_THREAD_SHOULD_PARK, | |
276 | }; | |
277 | ||
534ca6d6 JA |
278 | struct io_sq_data { |
279 | refcount_t refs; | |
9e138a48 | 280 | atomic_t park_pending; |
09a6f4ef | 281 | struct mutex lock; |
69fb2131 JA |
282 | |
283 | /* ctx's that are using this sqd */ | |
284 | struct list_head ctx_list; | |
69fb2131 | 285 | |
534ca6d6 JA |
286 | struct task_struct *thread; |
287 | struct wait_queue_head wait; | |
08369246 XW |
288 | |
289 | unsigned sq_thread_idle; | |
37d1e2e3 JA |
290 | int sq_cpu; |
291 | pid_t task_pid; | |
5c2469e0 | 292 | pid_t task_tgid; |
37d1e2e3 JA |
293 | |
294 | unsigned long state; | |
37d1e2e3 | 295 | struct completion exited; |
534ca6d6 JA |
296 | }; |
297 | ||
258b29a9 | 298 | #define IO_IOPOLL_BATCH 8 |
6dd0be1e | 299 | #define IO_COMPL_BATCH 32 |
6ff119a6 | 300 | #define IO_REQ_CACHE_SIZE 32 |
bf019da7 | 301 | #define IO_REQ_ALLOC_BATCH 8 |
258b29a9 PB |
302 | |
303 | struct io_comp_state { | |
6dd0be1e | 304 | struct io_kiocb *reqs[IO_COMPL_BATCH]; |
1b4c351f | 305 | unsigned int nr; |
c7dae4ba | 306 | /* inline/task_work completion list, under ->uring_lock */ |
1b4c351f | 307 | struct list_head free_list; |
258b29a9 PB |
308 | }; |
309 | ||
a1ab7b35 PB |
310 | struct io_submit_link { |
311 | struct io_kiocb *head; | |
312 | struct io_kiocb *last; | |
313 | }; | |
314 | ||
258b29a9 PB |
315 | struct io_submit_state { |
316 | struct blk_plug plug; | |
a1ab7b35 | 317 | struct io_submit_link link; |
258b29a9 PB |
318 | |
319 | /* | |
320 | * io_kiocb alloc cache | |
321 | */ | |
bf019da7 | 322 | void *reqs[IO_REQ_CACHE_SIZE]; |
258b29a9 PB |
323 | unsigned int free_reqs; |
324 | ||
325 | bool plug_started; | |
326 | ||
327 | /* | |
328 | * Batch completion logic | |
329 | */ | |
330 | struct io_comp_state comp; | |
331 | ||
332 | /* | |
333 | * File reference cache | |
334 | */ | |
335 | struct file *file; | |
336 | unsigned int fd; | |
337 | unsigned int file_refs; | |
338 | unsigned int ios_left; | |
339 | }; | |
340 | ||
2b188cc1 | 341 | struct io_ring_ctx { |
b52ecf8c | 342 | /* const or read-mostly hot data */ |
2b188cc1 JA |
343 | struct { |
344 | struct percpu_ref refs; | |
2b188cc1 | 345 | |
b52ecf8c | 346 | struct io_rings *rings; |
2b188cc1 | 347 | unsigned int flags; |
e1d85334 | 348 | unsigned int compat: 1; |
e1d85334 RD |
349 | unsigned int drain_next: 1; |
350 | unsigned int eventfd_async: 1; | |
21b55dbc | 351 | unsigned int restricted: 1; |
f18ee4cf | 352 | unsigned int off_timeout_used: 1; |
10c66904 | 353 | unsigned int drain_active: 1; |
b52ecf8c | 354 | } ____cacheline_aligned_in_smp; |
2b188cc1 | 355 | |
7f1129d2 | 356 | /* submission data */ |
b52ecf8c | 357 | struct { |
0499e582 PB |
358 | struct mutex uring_lock; |
359 | ||
75b28aff HV |
360 | /* |
361 | * Ring buffer of indices into array of io_uring_sqe, which is | |
362 | * mmapped by the application using the IORING_OFF_SQES offset. | |
363 | * | |
364 | * This indirection could e.g. be used to assign fixed | |
365 | * io_uring_sqe entries to operations and only submit them to | |
366 | * the queue when needed. | |
367 | * | |
368 | * The kernel modifies neither the indices array nor the entries | |
369 | * array. | |
370 | */ | |
371 | u32 *sq_array; | |
c7af47cf | 372 | struct io_uring_sqe *sq_sqes; |
2b188cc1 JA |
373 | unsigned cached_sq_head; |
374 | unsigned sq_entries; | |
de0617e4 | 375 | struct list_head defer_list; |
7f1129d2 PB |
376 | |
377 | /* | |
378 | * Fixed resources fast path, should be accessed only under | |
379 | * uring_lock, and updated through io_uring_register(2) | |
380 | */ | |
381 | struct io_rsrc_node *rsrc_node; | |
382 | struct io_file_table file_table; | |
383 | unsigned nr_user_files; | |
384 | unsigned nr_user_bufs; | |
385 | struct io_mapped_ubuf **user_bufs; | |
386 | ||
387 | struct io_submit_state submit_state; | |
5262f567 | 388 | struct list_head timeout_list; |
1d7bb1d5 | 389 | struct list_head cq_overflow_list; |
7f1129d2 PB |
390 | struct xarray io_buffers; |
391 | struct xarray personalities; | |
392 | u32 pers_next; | |
393 | unsigned sq_thread_idle; | |
2b188cc1 JA |
394 | } ____cacheline_aligned_in_smp; |
395 | ||
d0acdee2 PB |
396 | /* IRQ completion list, under ->completion_lock */ |
397 | struct list_head locked_free_list; | |
398 | unsigned int locked_free_nr; | |
3c1a2ead | 399 | |
7c30f36a | 400 | const struct cred *sq_creds; /* cred used for __io_sq_thread() */ |
534ca6d6 JA |
401 | struct io_sq_data *sq_data; /* if using sq thread polling */ |
402 | ||
90554200 | 403 | struct wait_queue_head sqo_sq_wait; |
69fb2131 | 404 | struct list_head sqd_list; |
75b28aff | 405 | |
5ed7a37d PB |
406 | unsigned long check_cq_overflow; |
407 | ||
206aefde JA |
408 | struct { |
409 | unsigned cached_cq_tail; | |
410 | unsigned cq_entries; | |
0499e582 | 411 | struct eventfd_ctx *cq_ev_fd; |
311997b3 | 412 | struct wait_queue_head poll_wait; |
0499e582 PB |
413 | struct wait_queue_head cq_wait; |
414 | unsigned cq_extra; | |
415 | atomic_t cq_timeouts; | |
206aefde | 416 | struct fasync_struct *cq_fasync; |
0499e582 | 417 | unsigned cq_last_tm_flush; |
206aefde | 418 | } ____cacheline_aligned_in_smp; |
2b188cc1 | 419 | |
2b188cc1 JA |
420 | struct { |
421 | spinlock_t completion_lock; | |
e94f141b | 422 | |
def596e9 | 423 | /* |
540e32a0 | 424 | * ->iopoll_list is protected by the ctx->uring_lock for |
def596e9 JA |
425 | * io_uring instances that don't use IORING_SETUP_SQPOLL. |
426 | * For SQPOLL, only the single threaded io_sq_thread() will | |
427 | * manipulate the list, hence no extra locking is needed there. | |
428 | */ | |
540e32a0 | 429 | struct list_head iopoll_list; |
78076bb6 JA |
430 | struct hlist_head *cancel_hash; |
431 | unsigned cancel_hash_bits; | |
915b3dde | 432 | bool poll_multi_queue; |
2b188cc1 | 433 | } ____cacheline_aligned_in_smp; |
85faa7b8 | 434 | |
21b55dbc | 435 | struct io_restriction restrictions; |
3c1a2ead | 436 | |
b13a8918 PB |
437 | /* slow path rsrc auxilary data, used by update/register */ |
438 | struct { | |
439 | struct io_rsrc_node *rsrc_backup_node; | |
440 | struct io_mapped_ubuf *dummy_ubuf; | |
441 | struct io_rsrc_data *file_data; | |
442 | struct io_rsrc_data *buf_data; | |
443 | ||
444 | struct delayed_work rsrc_put_work; | |
445 | struct llist_head rsrc_put_llist; | |
446 | struct list_head rsrc_ref_list; | |
447 | spinlock_t rsrc_ref_lock; | |
448 | }; | |
449 | ||
3c1a2ead | 450 | /* Keep this last, we don't need it for the fast path */ |
b986af7e PB |
451 | struct { |
452 | #if defined(CONFIG_UNIX) | |
453 | struct socket *ring_sock; | |
454 | #endif | |
455 | /* hashed buffered write serialization */ | |
456 | struct io_wq_hash *hash_map; | |
457 | ||
458 | /* Only used for accounting purposes */ | |
459 | struct user_struct *user; | |
460 | struct mm_struct *mm_account; | |
461 | ||
462 | /* ctx exit and cancelation */ | |
9011bf9a PB |
463 | struct llist_head fallback_llist; |
464 | struct delayed_work fallback_work; | |
b986af7e PB |
465 | struct work_struct exit_work; |
466 | struct list_head tctx_list; | |
467 | struct completion ref_comp; | |
468 | }; | |
2b188cc1 JA |
469 | }; |
470 | ||
53e043b2 SM |
471 | struct io_uring_task { |
472 | /* submission side */ | |
09899b19 | 473 | int cached_refs; |
53e043b2 SM |
474 | struct xarray xa; |
475 | struct wait_queue_head wait; | |
ee53fb2b SM |
476 | const struct io_ring_ctx *last; |
477 | struct io_wq *io_wq; | |
53e043b2 | 478 | struct percpu_counter inflight; |
b303fe2e | 479 | atomic_t inflight_tracked; |
53e043b2 | 480 | atomic_t in_idle; |
53e043b2 SM |
481 | |
482 | spinlock_t task_lock; | |
483 | struct io_wq_work_list task_list; | |
484 | unsigned long task_state; | |
485 | struct callback_head task_work; | |
486 | }; | |
487 | ||
09bb8394 JA |
488 | /* |
489 | * First field must be the file pointer in all the | |
490 | * iocb unions! See also 'struct kiocb' in <linux/fs.h> | |
491 | */ | |
221c5eb2 JA |
492 | struct io_poll_iocb { |
493 | struct file *file; | |
018043be | 494 | struct wait_queue_head *head; |
221c5eb2 | 495 | __poll_t events; |
8c838788 | 496 | bool done; |
221c5eb2 | 497 | bool canceled; |
392edb45 | 498 | struct wait_queue_entry wait; |
221c5eb2 JA |
499 | }; |
500 | ||
9d805892 | 501 | struct io_poll_update { |
018043be | 502 | struct file *file; |
9d805892 PB |
503 | u64 old_user_data; |
504 | u64 new_user_data; | |
505 | __poll_t events; | |
b69de288 JA |
506 | bool update_events; |
507 | bool update_user_data; | |
018043be PB |
508 | }; |
509 | ||
b5dba59e JA |
510 | struct io_close { |
511 | struct file *file; | |
b5dba59e JA |
512 | int fd; |
513 | }; | |
514 | ||
ad8a48ac JA |
515 | struct io_timeout_data { |
516 | struct io_kiocb *req; | |
517 | struct hrtimer timer; | |
518 | struct timespec64 ts; | |
519 | enum hrtimer_mode mode; | |
520 | }; | |
521 | ||
8ed8d3c3 JA |
522 | struct io_accept { |
523 | struct file *file; | |
524 | struct sockaddr __user *addr; | |
525 | int __user *addr_len; | |
526 | int flags; | |
09952e3e | 527 | unsigned long nofile; |
8ed8d3c3 JA |
528 | }; |
529 | ||
530 | struct io_sync { | |
531 | struct file *file; | |
532 | loff_t len; | |
533 | loff_t off; | |
534 | int flags; | |
d63d1b5e | 535 | int mode; |
8ed8d3c3 JA |
536 | }; |
537 | ||
fbf23849 JA |
538 | struct io_cancel { |
539 | struct file *file; | |
540 | u64 addr; | |
541 | }; | |
542 | ||
b29472ee JA |
543 | struct io_timeout { |
544 | struct file *file; | |
bfe68a22 PB |
545 | u32 off; |
546 | u32 target_seq; | |
135fcde8 | 547 | struct list_head list; |
90cd7e42 PB |
548 | /* head of the link, used by linked timeouts only */ |
549 | struct io_kiocb *head; | |
b29472ee JA |
550 | }; |
551 | ||
0bdf7a2d PB |
552 | struct io_timeout_rem { |
553 | struct file *file; | |
554 | u64 addr; | |
9c8e11b3 PB |
555 | |
556 | /* timeout update */ | |
557 | struct timespec64 ts; | |
558 | u32 flags; | |
0bdf7a2d PB |
559 | }; |
560 | ||
9adbd45d JA |
561 | struct io_rw { |
562 | /* NOTE: kiocb has the file as the first member, so don't do it here */ | |
563 | struct kiocb kiocb; | |
564 | u64 addr; | |
565 | u64 len; | |
566 | }; | |
567 | ||
3fbb51c1 JA |
568 | struct io_connect { |
569 | struct file *file; | |
570 | struct sockaddr __user *addr; | |
571 | int addr_len; | |
572 | }; | |
573 | ||
e47293fd JA |
574 | struct io_sr_msg { |
575 | struct file *file; | |
fddaface | 576 | union { |
4af3417a PB |
577 | struct compat_msghdr __user *umsg_compat; |
578 | struct user_msghdr __user *umsg; | |
579 | void __user *buf; | |
fddaface | 580 | }; |
e47293fd | 581 | int msg_flags; |
bcda7baa | 582 | int bgid; |
fddaface | 583 | size_t len; |
bcda7baa | 584 | struct io_buffer *kbuf; |
e47293fd JA |
585 | }; |
586 | ||
15b71abe JA |
587 | struct io_open { |
588 | struct file *file; | |
589 | int dfd; | |
15b71abe | 590 | struct filename *filename; |
c12cedf2 | 591 | struct open_how how; |
4022e7af | 592 | unsigned long nofile; |
15b71abe JA |
593 | }; |
594 | ||
269bbe5f | 595 | struct io_rsrc_update { |
05f3fb3c JA |
596 | struct file *file; |
597 | u64 arg; | |
598 | u32 nr_args; | |
599 | u32 offset; | |
600 | }; | |
601 | ||
4840e418 JA |
602 | struct io_fadvise { |
603 | struct file *file; | |
604 | u64 offset; | |
605 | u32 len; | |
606 | u32 advice; | |
607 | }; | |
608 | ||
c1ca757b JA |
609 | struct io_madvise { |
610 | struct file *file; | |
611 | u64 addr; | |
612 | u32 len; | |
613 | u32 advice; | |
614 | }; | |
615 | ||
3e4827b0 JA |
616 | struct io_epoll { |
617 | struct file *file; | |
618 | int epfd; | |
619 | int op; | |
620 | int fd; | |
621 | struct epoll_event event; | |
e47293fd JA |
622 | }; |
623 | ||
7d67af2c PB |
624 | struct io_splice { |
625 | struct file *file_out; | |
626 | struct file *file_in; | |
627 | loff_t off_out; | |
628 | loff_t off_in; | |
629 | u64 len; | |
630 | unsigned int flags; | |
631 | }; | |
632 | ||
ddf0322d JA |
633 | struct io_provide_buf { |
634 | struct file *file; | |
635 | __u64 addr; | |
38134ada | 636 | __u32 len; |
ddf0322d JA |
637 | __u32 bgid; |
638 | __u16 nbufs; | |
639 | __u16 bid; | |
640 | }; | |
641 | ||
1d9e1288 BM |
642 | struct io_statx { |
643 | struct file *file; | |
644 | int dfd; | |
645 | unsigned int mask; | |
646 | unsigned int flags; | |
e62753e4 | 647 | const char __user *filename; |
1d9e1288 BM |
648 | struct statx __user *buffer; |
649 | }; | |
650 | ||
36f4fa68 JA |
651 | struct io_shutdown { |
652 | struct file *file; | |
653 | int how; | |
654 | }; | |
655 | ||
80a261fd JA |
656 | struct io_rename { |
657 | struct file *file; | |
658 | int old_dfd; | |
659 | int new_dfd; | |
660 | struct filename *oldpath; | |
661 | struct filename *newpath; | |
662 | int flags; | |
663 | }; | |
664 | ||
14a1143b JA |
665 | struct io_unlink { |
666 | struct file *file; | |
667 | int dfd; | |
668 | int flags; | |
669 | struct filename *filename; | |
670 | }; | |
671 | ||
3ca405eb PB |
672 | struct io_completion { |
673 | struct file *file; | |
674 | struct list_head list; | |
8c3f9cd1 | 675 | u32 cflags; |
3ca405eb PB |
676 | }; |
677 | ||
f499a021 JA |
678 | struct io_async_connect { |
679 | struct sockaddr_storage address; | |
680 | }; | |
681 | ||
03b1230c JA |
682 | struct io_async_msghdr { |
683 | struct iovec fast_iov[UIO_FASTIOV]; | |
257e84a5 PB |
684 | /* points to an allocated iov, if NULL we use fast_iov instead */ |
685 | struct iovec *free_iov; | |
03b1230c JA |
686 | struct sockaddr __user *uaddr; |
687 | struct msghdr msg; | |
b537916c | 688 | struct sockaddr_storage addr; |
03b1230c JA |
689 | }; |
690 | ||
f67676d1 JA |
691 | struct io_async_rw { |
692 | struct iovec fast_iov[UIO_FASTIOV]; | |
ff6165b2 JA |
693 | const struct iovec *free_iovec; |
694 | struct iov_iter iter; | |
227c0c96 | 695 | size_t bytes_done; |
bcf5a063 | 696 | struct wait_page_queue wpq; |
f67676d1 JA |
697 | }; |
698 | ||
6b47ee6e PB |
699 | enum { |
700 | REQ_F_FIXED_FILE_BIT = IOSQE_FIXED_FILE_BIT, | |
701 | REQ_F_IO_DRAIN_BIT = IOSQE_IO_DRAIN_BIT, | |
702 | REQ_F_LINK_BIT = IOSQE_IO_LINK_BIT, | |
703 | REQ_F_HARDLINK_BIT = IOSQE_IO_HARDLINK_BIT, | |
704 | REQ_F_FORCE_ASYNC_BIT = IOSQE_ASYNC_BIT, | |
bcda7baa | 705 | REQ_F_BUFFER_SELECT_BIT = IOSQE_BUFFER_SELECT_BIT, |
6b47ee6e | 706 | |
dddca226 | 707 | /* first byte is taken by user flags, shift it to not overlap */ |
93d2bcd2 | 708 | REQ_F_FAIL_BIT = 8, |
6b47ee6e PB |
709 | REQ_F_INFLIGHT_BIT, |
710 | REQ_F_CUR_POS_BIT, | |
711 | REQ_F_NOWAIT_BIT, | |
6b47ee6e | 712 | REQ_F_LINK_TIMEOUT_BIT, |
99bc4c38 | 713 | REQ_F_NEED_CLEANUP_BIT, |
d7718a9d | 714 | REQ_F_POLLED_BIT, |
bcda7baa | 715 | REQ_F_BUFFER_SELECTED_BIT, |
900fad45 | 716 | REQ_F_LTIMEOUT_ACTIVE_BIT, |
e342c807 | 717 | REQ_F_COMPLETE_INLINE_BIT, |
230d50d4 | 718 | REQ_F_REISSUE_BIT, |
8c130827 | 719 | REQ_F_DONT_REISSUE_BIT, |
b8e64b53 | 720 | REQ_F_CREDS_BIT, |
7b29f92d | 721 | /* keep async read/write and isreg together and in order */ |
b191e2df PB |
722 | REQ_F_NOWAIT_READ_BIT, |
723 | REQ_F_NOWAIT_WRITE_BIT, | |
7b29f92d | 724 | REQ_F_ISREG_BIT, |
84557871 JA |
725 | |
726 | /* not a real bit, just to check we're not overflowing the space */ | |
727 | __REQ_F_LAST_BIT, | |
6b47ee6e PB |
728 | }; |
729 | ||
730 | enum { | |
731 | /* ctx owns file */ | |
732 | REQ_F_FIXED_FILE = BIT(REQ_F_FIXED_FILE_BIT), | |
733 | /* drain existing IO first */ | |
734 | REQ_F_IO_DRAIN = BIT(REQ_F_IO_DRAIN_BIT), | |
735 | /* linked sqes */ | |
736 | REQ_F_LINK = BIT(REQ_F_LINK_BIT), | |
737 | /* doesn't sever on completion < 0 */ | |
738 | REQ_F_HARDLINK = BIT(REQ_F_HARDLINK_BIT), | |
739 | /* IOSQE_ASYNC */ | |
740 | REQ_F_FORCE_ASYNC = BIT(REQ_F_FORCE_ASYNC_BIT), | |
bcda7baa JA |
741 | /* IOSQE_BUFFER_SELECT */ |
742 | REQ_F_BUFFER_SELECT = BIT(REQ_F_BUFFER_SELECT_BIT), | |
6b47ee6e | 743 | |
6b47ee6e | 744 | /* fail rest of links */ |
93d2bcd2 | 745 | REQ_F_FAIL = BIT(REQ_F_FAIL_BIT), |
b05a1bcd | 746 | /* on inflight list, should be cancelled and waited on exit reliably */ |
6b47ee6e PB |
747 | REQ_F_INFLIGHT = BIT(REQ_F_INFLIGHT_BIT), |
748 | /* read/write uses file position */ | |
749 | REQ_F_CUR_POS = BIT(REQ_F_CUR_POS_BIT), | |
750 | /* must not punt to workers */ | |
751 | REQ_F_NOWAIT = BIT(REQ_F_NOWAIT_BIT), | |
900fad45 | 752 | /* has or had linked timeout */ |
6b47ee6e | 753 | REQ_F_LINK_TIMEOUT = BIT(REQ_F_LINK_TIMEOUT_BIT), |
99bc4c38 PB |
754 | /* needs cleanup */ |
755 | REQ_F_NEED_CLEANUP = BIT(REQ_F_NEED_CLEANUP_BIT), | |
d7718a9d JA |
756 | /* already went through poll handler */ |
757 | REQ_F_POLLED = BIT(REQ_F_POLLED_BIT), | |
bcda7baa JA |
758 | /* buffer already selected */ |
759 | REQ_F_BUFFER_SELECTED = BIT(REQ_F_BUFFER_SELECTED_BIT), | |
900fad45 PB |
760 | /* linked timeout is active, i.e. prepared by link's head */ |
761 | REQ_F_LTIMEOUT_ACTIVE = BIT(REQ_F_LTIMEOUT_ACTIVE_BIT), | |
e342c807 PB |
762 | /* completion is deferred through io_comp_state */ |
763 | REQ_F_COMPLETE_INLINE = BIT(REQ_F_COMPLETE_INLINE_BIT), | |
230d50d4 JA |
764 | /* caller should reissue async */ |
765 | REQ_F_REISSUE = BIT(REQ_F_REISSUE_BIT), | |
8c130827 PB |
766 | /* don't attempt request reissue, see io_rw_reissue() */ |
767 | REQ_F_DONT_REISSUE = BIT(REQ_F_DONT_REISSUE_BIT), | |
7b29f92d | 768 | /* supports async reads */ |
b191e2df | 769 | REQ_F_NOWAIT_READ = BIT(REQ_F_NOWAIT_READ_BIT), |
7b29f92d | 770 | /* supports async writes */ |
b191e2df | 771 | REQ_F_NOWAIT_WRITE = BIT(REQ_F_NOWAIT_WRITE_BIT), |
7b29f92d JA |
772 | /* regular file */ |
773 | REQ_F_ISREG = BIT(REQ_F_ISREG_BIT), | |
b8e64b53 PB |
774 | /* has creds assigned */ |
775 | REQ_F_CREDS = BIT(REQ_F_CREDS_BIT), | |
d7718a9d JA |
776 | }; |
777 | ||
778 | struct async_poll { | |
779 | struct io_poll_iocb poll; | |
807abcb0 | 780 | struct io_poll_iocb *double_poll; |
6b47ee6e PB |
781 | }; |
782 | ||
5b0a6acc PB |
783 | typedef void (*io_req_tw_func_t)(struct io_kiocb *req); |
784 | ||
7cbf1722 | 785 | struct io_task_work { |
5b0a6acc PB |
786 | union { |
787 | struct io_wq_work_node node; | |
788 | struct llist_node fallback_node; | |
789 | }; | |
790 | io_req_tw_func_t func; | |
7cbf1722 JA |
791 | }; |
792 | ||
992da01a PB |
793 | enum { |
794 | IORING_RSRC_FILE = 0, | |
795 | IORING_RSRC_BUFFER = 1, | |
796 | }; | |
797 | ||
09bb8394 JA |
798 | /* |
799 | * NOTE! Each of the iocb union members has the file pointer | |
800 | * as the first entry in their struct definition. So you can | |
801 | * access the file pointer through any of the sub-structs, | |
802 | * or directly as just 'ki_filp' in this struct. | |
803 | */ | |
2b188cc1 | 804 | struct io_kiocb { |
221c5eb2 | 805 | union { |
09bb8394 | 806 | struct file *file; |
9adbd45d | 807 | struct io_rw rw; |
221c5eb2 | 808 | struct io_poll_iocb poll; |
9d805892 | 809 | struct io_poll_update poll_update; |
8ed8d3c3 JA |
810 | struct io_accept accept; |
811 | struct io_sync sync; | |
fbf23849 | 812 | struct io_cancel cancel; |
b29472ee | 813 | struct io_timeout timeout; |
0bdf7a2d | 814 | struct io_timeout_rem timeout_rem; |
3fbb51c1 | 815 | struct io_connect connect; |
e47293fd | 816 | struct io_sr_msg sr_msg; |
15b71abe | 817 | struct io_open open; |
b5dba59e | 818 | struct io_close close; |
269bbe5f | 819 | struct io_rsrc_update rsrc_update; |
4840e418 | 820 | struct io_fadvise fadvise; |
c1ca757b | 821 | struct io_madvise madvise; |
3e4827b0 | 822 | struct io_epoll epoll; |
7d67af2c | 823 | struct io_splice splice; |
ddf0322d | 824 | struct io_provide_buf pbuf; |
1d9e1288 | 825 | struct io_statx statx; |
36f4fa68 | 826 | struct io_shutdown shutdown; |
80a261fd | 827 | struct io_rename rename; |
14a1143b | 828 | struct io_unlink unlink; |
3ca405eb PB |
829 | /* use only after cleaning per-op data, see io_clean_op() */ |
830 | struct io_completion compl; | |
221c5eb2 | 831 | }; |
2b188cc1 | 832 | |
e8c2bc1f JA |
833 | /* opcode allocated if it needs to store data for async defer */ |
834 | void *async_data; | |
d625c6ee | 835 | u8 opcode; |
65a6543d XW |
836 | /* polled IO has completed */ |
837 | u8 iopoll_completed; | |
2b188cc1 | 838 | |
4f4eeba8 | 839 | u16 buf_index; |
9cf7c104 | 840 | u32 result; |
4f4eeba8 | 841 | |
010e8e6b PB |
842 | struct io_ring_ctx *ctx; |
843 | unsigned int flags; | |
abc54d63 | 844 | atomic_t refs; |
010e8e6b PB |
845 | struct task_struct *task; |
846 | u64 user_data; | |
d7718a9d | 847 | |
f2f87370 | 848 | struct io_kiocb *link; |
269bbe5f | 849 | struct percpu_ref *fixed_rsrc_refs; |
fcb323cc | 850 | |
b303fe2e | 851 | /* used with ctx->iopoll_list with reads/writes */ |
010e8e6b | 852 | struct list_head inflight_entry; |
5b0a6acc | 853 | struct io_task_work io_task_work; |
010e8e6b PB |
854 | /* for polled requests, i.e. IORING_OP_POLL_ADD and async armed poll */ |
855 | struct hlist_node hash_node; | |
856 | struct async_poll *apoll; | |
857 | struct io_wq_work work; | |
fe7e3257 | 858 | const struct cred *creds; |
c10d1f98 | 859 | |
eae071c9 PB |
860 | /* store used ubuf, so we can prevent reloading */ |
861 | struct io_mapped_ubuf *imu; | |
2b188cc1 | 862 | }; |
05589553 | 863 | |
13bf43f5 PB |
864 | struct io_tctx_node { |
865 | struct list_head ctx_node; | |
866 | struct task_struct *task; | |
13bf43f5 PB |
867 | struct io_ring_ctx *ctx; |
868 | }; | |
869 | ||
27dc8338 PB |
870 | struct io_defer_entry { |
871 | struct list_head list; | |
872 | struct io_kiocb *req; | |
9cf7c104 | 873 | u32 seq; |
2b188cc1 JA |
874 | }; |
875 | ||
d3656344 | 876 | struct io_op_def { |
d3656344 JA |
877 | /* needs req->file assigned */ |
878 | unsigned needs_file : 1; | |
d3656344 JA |
879 | /* hash wq insertion if file is a regular file */ |
880 | unsigned hash_reg_file : 1; | |
881 | /* unbound wq insertion if file is a non-regular file */ | |
882 | unsigned unbound_nonreg_file : 1; | |
66f4af93 JA |
883 | /* opcode is not supported by this kernel */ |
884 | unsigned not_supported : 1; | |
8a72758c JA |
885 | /* set if opcode supports polled "wait" */ |
886 | unsigned pollin : 1; | |
887 | unsigned pollout : 1; | |
bcda7baa JA |
888 | /* op supports buffer selection */ |
889 | unsigned buffer_select : 1; | |
26f0505a PB |
890 | /* do prep async if is going to be punted */ |
891 | unsigned needs_async_setup : 1; | |
27926b68 JA |
892 | /* should block plug */ |
893 | unsigned plug : 1; | |
e8c2bc1f JA |
894 | /* size of async data needed, if any */ |
895 | unsigned short async_size; | |
d3656344 JA |
896 | }; |
897 | ||
0918682b | 898 | static const struct io_op_def io_op_defs[] = { |
0463b6c5 PB |
899 | [IORING_OP_NOP] = {}, |
900 | [IORING_OP_READV] = { | |
d3656344 JA |
901 | .needs_file = 1, |
902 | .unbound_nonreg_file = 1, | |
8a72758c | 903 | .pollin = 1, |
4d954c25 | 904 | .buffer_select = 1, |
26f0505a | 905 | .needs_async_setup = 1, |
27926b68 | 906 | .plug = 1, |
e8c2bc1f | 907 | .async_size = sizeof(struct io_async_rw), |
d3656344 | 908 | }, |
0463b6c5 | 909 | [IORING_OP_WRITEV] = { |
d3656344 JA |
910 | .needs_file = 1, |
911 | .hash_reg_file = 1, | |
912 | .unbound_nonreg_file = 1, | |
8a72758c | 913 | .pollout = 1, |
26f0505a | 914 | .needs_async_setup = 1, |
27926b68 | 915 | .plug = 1, |
e8c2bc1f | 916 | .async_size = sizeof(struct io_async_rw), |
d3656344 | 917 | }, |
0463b6c5 | 918 | [IORING_OP_FSYNC] = { |
d3656344 JA |
919 | .needs_file = 1, |
920 | }, | |
0463b6c5 | 921 | [IORING_OP_READ_FIXED] = { |
d3656344 JA |
922 | .needs_file = 1, |
923 | .unbound_nonreg_file = 1, | |
8a72758c | 924 | .pollin = 1, |
27926b68 | 925 | .plug = 1, |
e8c2bc1f | 926 | .async_size = sizeof(struct io_async_rw), |
d3656344 | 927 | }, |
0463b6c5 | 928 | [IORING_OP_WRITE_FIXED] = { |
d3656344 JA |
929 | .needs_file = 1, |
930 | .hash_reg_file = 1, | |
931 | .unbound_nonreg_file = 1, | |
8a72758c | 932 | .pollout = 1, |
27926b68 | 933 | .plug = 1, |
e8c2bc1f | 934 | .async_size = sizeof(struct io_async_rw), |
d3656344 | 935 | }, |
0463b6c5 | 936 | [IORING_OP_POLL_ADD] = { |
d3656344 JA |
937 | .needs_file = 1, |
938 | .unbound_nonreg_file = 1, | |
939 | }, | |
0463b6c5 PB |
940 | [IORING_OP_POLL_REMOVE] = {}, |
941 | [IORING_OP_SYNC_FILE_RANGE] = { | |
d3656344 JA |
942 | .needs_file = 1, |
943 | }, | |
0463b6c5 | 944 | [IORING_OP_SENDMSG] = { |
d3656344 JA |
945 | .needs_file = 1, |
946 | .unbound_nonreg_file = 1, | |
8a72758c | 947 | .pollout = 1, |
26f0505a | 948 | .needs_async_setup = 1, |
e8c2bc1f | 949 | .async_size = sizeof(struct io_async_msghdr), |
d3656344 | 950 | }, |
0463b6c5 | 951 | [IORING_OP_RECVMSG] = { |
d3656344 JA |
952 | .needs_file = 1, |
953 | .unbound_nonreg_file = 1, | |
8a72758c | 954 | .pollin = 1, |
52de1fe1 | 955 | .buffer_select = 1, |
26f0505a | 956 | .needs_async_setup = 1, |
e8c2bc1f | 957 | .async_size = sizeof(struct io_async_msghdr), |
d3656344 | 958 | }, |
0463b6c5 | 959 | [IORING_OP_TIMEOUT] = { |
e8c2bc1f | 960 | .async_size = sizeof(struct io_timeout_data), |
d3656344 | 961 | }, |
9c8e11b3 PB |
962 | [IORING_OP_TIMEOUT_REMOVE] = { |
963 | /* used by timeout updates' prep() */ | |
9c8e11b3 | 964 | }, |
0463b6c5 | 965 | [IORING_OP_ACCEPT] = { |
d3656344 JA |
966 | .needs_file = 1, |
967 | .unbound_nonreg_file = 1, | |
8a72758c | 968 | .pollin = 1, |
d3656344 | 969 | }, |
0463b6c5 PB |
970 | [IORING_OP_ASYNC_CANCEL] = {}, |
971 | [IORING_OP_LINK_TIMEOUT] = { | |
e8c2bc1f | 972 | .async_size = sizeof(struct io_timeout_data), |
d3656344 | 973 | }, |
0463b6c5 | 974 | [IORING_OP_CONNECT] = { |
d3656344 JA |
975 | .needs_file = 1, |
976 | .unbound_nonreg_file = 1, | |
8a72758c | 977 | .pollout = 1, |
26f0505a | 978 | .needs_async_setup = 1, |
e8c2bc1f | 979 | .async_size = sizeof(struct io_async_connect), |
d3656344 | 980 | }, |
0463b6c5 | 981 | [IORING_OP_FALLOCATE] = { |
d3656344 | 982 | .needs_file = 1, |
d3656344 | 983 | }, |
44526bed JA |
984 | [IORING_OP_OPENAT] = {}, |
985 | [IORING_OP_CLOSE] = {}, | |
986 | [IORING_OP_FILES_UPDATE] = {}, | |
987 | [IORING_OP_STATX] = {}, | |
0463b6c5 | 988 | [IORING_OP_READ] = { |
3a6820f2 JA |
989 | .needs_file = 1, |
990 | .unbound_nonreg_file = 1, | |
8a72758c | 991 | .pollin = 1, |
bcda7baa | 992 | .buffer_select = 1, |
27926b68 | 993 | .plug = 1, |
e8c2bc1f | 994 | .async_size = sizeof(struct io_async_rw), |
3a6820f2 | 995 | }, |
0463b6c5 | 996 | [IORING_OP_WRITE] = { |
3a6820f2 JA |
997 | .needs_file = 1, |
998 | .unbound_nonreg_file = 1, | |
8a72758c | 999 | .pollout = 1, |
27926b68 | 1000 | .plug = 1, |
e8c2bc1f | 1001 | .async_size = sizeof(struct io_async_rw), |
3a6820f2 | 1002 | }, |
0463b6c5 | 1003 | [IORING_OP_FADVISE] = { |
4840e418 | 1004 | .needs_file = 1, |
c1ca757b | 1005 | }, |
44526bed | 1006 | [IORING_OP_MADVISE] = {}, |
0463b6c5 | 1007 | [IORING_OP_SEND] = { |
fddaface JA |
1008 | .needs_file = 1, |
1009 | .unbound_nonreg_file = 1, | |
8a72758c | 1010 | .pollout = 1, |
fddaface | 1011 | }, |
0463b6c5 | 1012 | [IORING_OP_RECV] = { |
fddaface JA |
1013 | .needs_file = 1, |
1014 | .unbound_nonreg_file = 1, | |
8a72758c | 1015 | .pollin = 1, |
bcda7baa | 1016 | .buffer_select = 1, |
fddaface | 1017 | }, |
0463b6c5 | 1018 | [IORING_OP_OPENAT2] = { |
cebdb986 | 1019 | }, |
3e4827b0 JA |
1020 | [IORING_OP_EPOLL_CTL] = { |
1021 | .unbound_nonreg_file = 1, | |
3e4827b0 | 1022 | }, |
7d67af2c PB |
1023 | [IORING_OP_SPLICE] = { |
1024 | .needs_file = 1, | |
1025 | .hash_reg_file = 1, | |
1026 | .unbound_nonreg_file = 1, | |
ddf0322d JA |
1027 | }, |
1028 | [IORING_OP_PROVIDE_BUFFERS] = {}, | |
067524e9 | 1029 | [IORING_OP_REMOVE_BUFFERS] = {}, |
f2a8d5c7 PB |
1030 | [IORING_OP_TEE] = { |
1031 | .needs_file = 1, | |
1032 | .hash_reg_file = 1, | |
1033 | .unbound_nonreg_file = 1, | |
1034 | }, | |
36f4fa68 JA |
1035 | [IORING_OP_SHUTDOWN] = { |
1036 | .needs_file = 1, | |
1037 | }, | |
44526bed JA |
1038 | [IORING_OP_RENAMEAT] = {}, |
1039 | [IORING_OP_UNLINKAT] = {}, | |
d3656344 JA |
1040 | }; |
1041 | ||
7a612350 | 1042 | static bool io_disarm_next(struct io_kiocb *req); |
eef51daa | 1043 | static void io_uring_del_tctx_node(unsigned long index); |
9936c7c2 PB |
1044 | static void io_uring_try_cancel_requests(struct io_ring_ctx *ctx, |
1045 | struct task_struct *task, | |
3dd0c97a | 1046 | bool cancel_all); |
78cc687b | 1047 | static void io_uring_cancel_generic(bool cancel_all, struct io_sq_data *sqd); |
1ffc5422 | 1048 | |
d4d19c19 PB |
1049 | static bool io_cqring_fill_event(struct io_ring_ctx *ctx, u64 user_data, |
1050 | long res, unsigned int cflags); | |
ec9c02ad | 1051 | static void io_put_req(struct io_kiocb *req); |
216578e5 | 1052 | static void io_put_req_deferred(struct io_kiocb *req, int nr); |
c7dae4ba | 1053 | static void io_dismantle_req(struct io_kiocb *req); |
94ae5e77 JA |
1054 | static struct io_kiocb *io_prep_linked_timeout(struct io_kiocb *req); |
1055 | static void io_queue_linked_timeout(struct io_kiocb *req); | |
fdecb662 | 1056 | static int __io_register_rsrc_update(struct io_ring_ctx *ctx, unsigned type, |
c3bdad02 | 1057 | struct io_uring_rsrc_update2 *up, |
98f0b3b4 | 1058 | unsigned nr_args); |
68fb8979 | 1059 | static void io_clean_op(struct io_kiocb *req); |
ac177053 PB |
1060 | static struct file *io_file_get(struct io_ring_ctx *ctx, |
1061 | struct io_submit_state *state, | |
8371adf5 | 1062 | struct io_kiocb *req, int fd, bool fixed); |
c5eef2b9 | 1063 | static void __io_queue_sqe(struct io_kiocb *req); |
269bbe5f | 1064 | static void io_rsrc_put_work(struct work_struct *work); |
de0617e4 | 1065 | |
907d1df3 | 1066 | static void io_req_task_queue(struct io_kiocb *req); |
2a2758f2 | 1067 | static void io_submit_flush_completions(struct io_ring_ctx *ctx); |
5082620f | 1068 | static bool io_poll_remove_waitqs(struct io_kiocb *req); |
179ae0d1 | 1069 | static int io_req_prep_async(struct io_kiocb *req); |
de0617e4 | 1070 | |
9011bf9a PB |
1071 | static void io_fallback_req_func(struct work_struct *unused); |
1072 | ||
2b188cc1 JA |
1073 | static struct kmem_cache *req_cachep; |
1074 | ||
0918682b | 1075 | static const struct file_operations io_uring_fops; |
2b188cc1 JA |
1076 | |
1077 | struct sock *io_uring_get_socket(struct file *file) | |
1078 | { | |
1079 | #if defined(CONFIG_UNIX) | |
1080 | if (file->f_op == &io_uring_fops) { | |
1081 | struct io_ring_ctx *ctx = file->private_data; | |
1082 | ||
1083 | return ctx->ring_sock->sk; | |
1084 | } | |
1085 | #endif | |
1086 | return NULL; | |
1087 | } | |
1088 | EXPORT_SYMBOL(io_uring_get_socket); | |
1089 | ||
f2f87370 PB |
1090 | #define io_for_each_link(pos, head) \ |
1091 | for (pos = (head); pos; pos = pos->link) | |
1092 | ||
b895c9a6 | 1093 | static inline void io_req_set_rsrc_node(struct io_kiocb *req) |
36f72fe2 PB |
1094 | { |
1095 | struct io_ring_ctx *ctx = req->ctx; | |
1096 | ||
269bbe5f | 1097 | if (!req->fixed_rsrc_refs) { |
a7f0ed5a | 1098 | req->fixed_rsrc_refs = &ctx->rsrc_node->refs; |
269bbe5f | 1099 | percpu_ref_get(req->fixed_rsrc_refs); |
36f72fe2 PB |
1100 | } |
1101 | } | |
1102 | ||
f70865db PB |
1103 | static void io_refs_resurrect(struct percpu_ref *ref, struct completion *compl) |
1104 | { | |
1105 | bool got = percpu_ref_tryget(ref); | |
1106 | ||
1107 | /* already at zero, wait for ->release() */ | |
1108 | if (!got) | |
1109 | wait_for_completion(compl); | |
1110 | percpu_ref_resurrect(ref); | |
1111 | if (got) | |
1112 | percpu_ref_put(ref); | |
1113 | } | |
1114 | ||
3dd0c97a PB |
1115 | static bool io_match_task(struct io_kiocb *head, struct task_struct *task, |
1116 | bool cancel_all) | |
08d23634 PB |
1117 | { |
1118 | struct io_kiocb *req; | |
1119 | ||
68207680 | 1120 | if (task && head->task != task) |
08d23634 | 1121 | return false; |
3dd0c97a | 1122 | if (cancel_all) |
08d23634 PB |
1123 | return true; |
1124 | ||
1125 | io_for_each_link(req, head) { | |
b05a1bcd | 1126 | if (req->flags & REQ_F_INFLIGHT) |
02a13674 | 1127 | return true; |
08d23634 PB |
1128 | } |
1129 | return false; | |
1130 | } | |
1131 | ||
93d2bcd2 | 1132 | static inline void req_set_fail(struct io_kiocb *req) |
c40f6379 | 1133 | { |
93d2bcd2 | 1134 | req->flags |= REQ_F_FAIL; |
c40f6379 | 1135 | } |
4a38aed2 | 1136 | |
2b188cc1 JA |
1137 | static void io_ring_ctx_ref_free(struct percpu_ref *ref) |
1138 | { | |
1139 | struct io_ring_ctx *ctx = container_of(ref, struct io_ring_ctx, refs); | |
1140 | ||
0f158b4c | 1141 | complete(&ctx->ref_comp); |
2b188cc1 JA |
1142 | } |
1143 | ||
8eb7e2d0 PB |
1144 | static inline bool io_is_timeout_noseq(struct io_kiocb *req) |
1145 | { | |
1146 | return !req->timeout.off; | |
1147 | } | |
1148 | ||
2b188cc1 JA |
1149 | static struct io_ring_ctx *io_ring_ctx_alloc(struct io_uring_params *p) |
1150 | { | |
1151 | struct io_ring_ctx *ctx; | |
78076bb6 | 1152 | int hash_bits; |
2b188cc1 JA |
1153 | |
1154 | ctx = kzalloc(sizeof(*ctx), GFP_KERNEL); | |
1155 | if (!ctx) | |
1156 | return NULL; | |
1157 | ||
78076bb6 JA |
1158 | /* |
1159 | * Use 5 bits less than the max cq entries, that should give us around | |
1160 | * 32 entries per hash list if totally full and uniformly spread. | |
1161 | */ | |
1162 | hash_bits = ilog2(p->cq_entries); | |
1163 | hash_bits -= 5; | |
1164 | if (hash_bits <= 0) | |
1165 | hash_bits = 1; | |
1166 | ctx->cancel_hash_bits = hash_bits; | |
1167 | ctx->cancel_hash = kmalloc((1U << hash_bits) * sizeof(struct hlist_head), | |
1168 | GFP_KERNEL); | |
1169 | if (!ctx->cancel_hash) | |
1170 | goto err; | |
1171 | __hash_init(ctx->cancel_hash, 1U << hash_bits); | |
1172 | ||
6224843d PB |
1173 | ctx->dummy_ubuf = kzalloc(sizeof(*ctx->dummy_ubuf), GFP_KERNEL); |
1174 | if (!ctx->dummy_ubuf) | |
1175 | goto err; | |
1176 | /* set invalid range, so io_import_fixed() fails meeting it */ | |
1177 | ctx->dummy_ubuf->ubuf = -1UL; | |
1178 | ||
21482896 | 1179 | if (percpu_ref_init(&ctx->refs, io_ring_ctx_ref_free, |
206aefde JA |
1180 | PERCPU_REF_ALLOW_REINIT, GFP_KERNEL)) |
1181 | goto err; | |
2b188cc1 JA |
1182 | |
1183 | ctx->flags = p->flags; | |
90554200 | 1184 | init_waitqueue_head(&ctx->sqo_sq_wait); |
69fb2131 | 1185 | INIT_LIST_HEAD(&ctx->sqd_list); |
311997b3 | 1186 | init_waitqueue_head(&ctx->poll_wait); |
1d7bb1d5 | 1187 | INIT_LIST_HEAD(&ctx->cq_overflow_list); |
0f158b4c | 1188 | init_completion(&ctx->ref_comp); |
9e15c3a0 | 1189 | xa_init_flags(&ctx->io_buffers, XA_FLAGS_ALLOC1); |
61cf9370 | 1190 | xa_init_flags(&ctx->personalities, XA_FLAGS_ALLOC1); |
2b188cc1 | 1191 | mutex_init(&ctx->uring_lock); |
311997b3 | 1192 | init_waitqueue_head(&ctx->cq_wait); |
2b188cc1 | 1193 | spin_lock_init(&ctx->completion_lock); |
540e32a0 | 1194 | INIT_LIST_HEAD(&ctx->iopoll_list); |
de0617e4 | 1195 | INIT_LIST_HEAD(&ctx->defer_list); |
5262f567 | 1196 | INIT_LIST_HEAD(&ctx->timeout_list); |
d67d2263 BM |
1197 | spin_lock_init(&ctx->rsrc_ref_lock); |
1198 | INIT_LIST_HEAD(&ctx->rsrc_ref_list); | |
269bbe5f BM |
1199 | INIT_DELAYED_WORK(&ctx->rsrc_put_work, io_rsrc_put_work); |
1200 | init_llist_head(&ctx->rsrc_put_llist); | |
13bf43f5 | 1201 | INIT_LIST_HEAD(&ctx->tctx_list); |
1b4c351f | 1202 | INIT_LIST_HEAD(&ctx->submit_state.comp.free_list); |
d0acdee2 | 1203 | INIT_LIST_HEAD(&ctx->locked_free_list); |
9011bf9a | 1204 | INIT_DELAYED_WORK(&ctx->fallback_work, io_fallback_req_func); |
2b188cc1 | 1205 | return ctx; |
206aefde | 1206 | err: |
6224843d | 1207 | kfree(ctx->dummy_ubuf); |
78076bb6 | 1208 | kfree(ctx->cancel_hash); |
206aefde JA |
1209 | kfree(ctx); |
1210 | return NULL; | |
2b188cc1 JA |
1211 | } |
1212 | ||
8f6ed49a PB |
1213 | static void io_account_cq_overflow(struct io_ring_ctx *ctx) |
1214 | { | |
1215 | struct io_rings *r = ctx->rings; | |
1216 | ||
1217 | WRITE_ONCE(r->cq_overflow, READ_ONCE(r->cq_overflow) + 1); | |
1218 | ctx->cq_extra--; | |
1219 | } | |
1220 | ||
9cf7c104 | 1221 | static bool req_need_defer(struct io_kiocb *req, u32 seq) |
7adf4eaf | 1222 | { |
2bc9930e JA |
1223 | if (unlikely(req->flags & REQ_F_IO_DRAIN)) { |
1224 | struct io_ring_ctx *ctx = req->ctx; | |
a197f664 | 1225 | |
8f6ed49a | 1226 | return seq + READ_ONCE(ctx->cq_extra) != ctx->cached_cq_tail; |
2bc9930e | 1227 | } |
de0617e4 | 1228 | |
9d858b21 | 1229 | return false; |
de0617e4 JA |
1230 | } |
1231 | ||
c97d8a0f PB |
1232 | #define FFS_ASYNC_READ 0x1UL |
1233 | #define FFS_ASYNC_WRITE 0x2UL | |
1234 | #ifdef CONFIG_64BIT | |
1235 | #define FFS_ISREG 0x4UL | |
1236 | #else | |
1237 | #define FFS_ISREG 0x0UL | |
1238 | #endif | |
1239 | #define FFS_MASK ~(FFS_ASYNC_READ|FFS_ASYNC_WRITE|FFS_ISREG) | |
1240 | ||
1241 | static inline bool io_req_ffs_set(struct io_kiocb *req) | |
1242 | { | |
1243 | return IS_ENABLED(CONFIG_64BIT) && (req->flags & REQ_F_FIXED_FILE); | |
1244 | } | |
1245 | ||
ce3d5aae PB |
1246 | static void io_req_track_inflight(struct io_kiocb *req) |
1247 | { | |
ce3d5aae | 1248 | if (!(req->flags & REQ_F_INFLIGHT)) { |
ce3d5aae | 1249 | req->flags |= REQ_F_INFLIGHT; |
b303fe2e | 1250 | atomic_inc(¤t->io_uring->inflight_tracked); |
ce3d5aae PB |
1251 | } |
1252 | } | |
1253 | ||
1e6fa521 JA |
1254 | static void io_prep_async_work(struct io_kiocb *req) |
1255 | { | |
1256 | const struct io_op_def *def = &io_op_defs[req->opcode]; | |
1e6fa521 JA |
1257 | struct io_ring_ctx *ctx = req->ctx; |
1258 | ||
b8e64b53 PB |
1259 | if (!(req->flags & REQ_F_CREDS)) { |
1260 | req->flags |= REQ_F_CREDS; | |
c10d1f98 | 1261 | req->creds = get_current_cred(); |
b8e64b53 | 1262 | } |
003e8dcc | 1263 | |
e1d675df PB |
1264 | req->work.list.next = NULL; |
1265 | req->work.flags = 0; | |
feaadc4f PB |
1266 | if (req->flags & REQ_F_FORCE_ASYNC) |
1267 | req->work.flags |= IO_WQ_WORK_CONCURRENT; | |
1268 | ||
1e6fa521 JA |
1269 | if (req->flags & REQ_F_ISREG) { |
1270 | if (def->hash_reg_file || (ctx->flags & IORING_SETUP_IOPOLL)) | |
1271 | io_wq_hash_work(&req->work, file_inode(req->file)); | |
4b982bd0 | 1272 | } else if (!req->file || !S_ISBLK(file_inode(req->file)->i_mode)) { |
1e6fa521 JA |
1273 | if (def->unbound_nonreg_file) |
1274 | req->work.flags |= IO_WQ_WORK_UNBOUND; | |
1275 | } | |
e1d675df PB |
1276 | |
1277 | switch (req->opcode) { | |
1278 | case IORING_OP_SPLICE: | |
1279 | case IORING_OP_TEE: | |
e1d675df PB |
1280 | if (!S_ISREG(file_inode(req->splice.file_in)->i_mode)) |
1281 | req->work.flags |= IO_WQ_WORK_UNBOUND; | |
1282 | break; | |
1283 | } | |
561fb04a | 1284 | } |
cccf0ee8 | 1285 | |
cbdcb435 | 1286 | static void io_prep_async_link(struct io_kiocb *req) |
561fb04a | 1287 | { |
cbdcb435 | 1288 | struct io_kiocb *cur; |
54a91f3b | 1289 | |
44eff40a PB |
1290 | if (req->flags & REQ_F_LINK_TIMEOUT) { |
1291 | struct io_ring_ctx *ctx = req->ctx; | |
1292 | ||
1293 | spin_lock_irq(&ctx->completion_lock); | |
1294 | io_for_each_link(cur, req) | |
1295 | io_prep_async_work(cur); | |
1296 | spin_unlock_irq(&ctx->completion_lock); | |
1297 | } else { | |
1298 | io_for_each_link(cur, req) | |
1299 | io_prep_async_work(cur); | |
1300 | } | |
561fb04a JA |
1301 | } |
1302 | ||
ebf93667 | 1303 | static void io_queue_async_work(struct io_kiocb *req) |
561fb04a | 1304 | { |
a197f664 | 1305 | struct io_ring_ctx *ctx = req->ctx; |
cbdcb435 | 1306 | struct io_kiocb *link = io_prep_linked_timeout(req); |
5aa75ed5 | 1307 | struct io_uring_task *tctx = req->task->io_uring; |
561fb04a | 1308 | |
3bfe6106 JA |
1309 | BUG_ON(!tctx); |
1310 | BUG_ON(!tctx->io_wq); | |
561fb04a | 1311 | |
cbdcb435 PB |
1312 | /* init ->work of the whole link before punting */ |
1313 | io_prep_async_link(req); | |
991468dc JA |
1314 | |
1315 | /* | |
1316 | * Not expected to happen, but if we do have a bug where this _can_ | |
1317 | * happen, catch it here and ensure the request is marked as | |
1318 | * canceled. That will make io-wq go through the usual work cancel | |
1319 | * procedure rather than attempt to run this request (or create a new | |
1320 | * worker for it). | |
1321 | */ | |
1322 | if (WARN_ON_ONCE(!same_thread_group(req->task, current))) | |
1323 | req->work.flags |= IO_WQ_WORK_CANCEL; | |
1324 | ||
d07f1e8a PB |
1325 | trace_io_uring_queue_async_work(ctx, io_wq_is_hashed(&req->work), req, |
1326 | &req->work, req->flags); | |
ebf93667 | 1327 | io_wq_enqueue(tctx->io_wq, &req->work); |
7271ef3a JA |
1328 | if (link) |
1329 | io_queue_linked_timeout(link); | |
cbdcb435 PB |
1330 | } |
1331 | ||
1ee4160c | 1332 | static void io_kill_timeout(struct io_kiocb *req, int status) |
8c855885 | 1333 | __must_hold(&req->ctx->completion_lock) |
5262f567 | 1334 | { |
e8c2bc1f | 1335 | struct io_timeout_data *io = req->async_data; |
5262f567 | 1336 | |
fd9c7bc5 | 1337 | if (hrtimer_try_to_cancel(&io->timer) != -1) { |
01cec8c1 PB |
1338 | atomic_set(&req->ctx->cq_timeouts, |
1339 | atomic_read(&req->ctx->cq_timeouts) + 1); | |
135fcde8 | 1340 | list_del_init(&req->timeout.list); |
d4d19c19 | 1341 | io_cqring_fill_event(req->ctx, req->user_data, status, 0); |
216578e5 | 1342 | io_put_req_deferred(req, 1); |
5262f567 JA |
1343 | } |
1344 | } | |
1345 | ||
441b8a78 | 1346 | static void io_queue_deferred(struct io_ring_ctx *ctx) |
de0617e4 | 1347 | { |
441b8a78 | 1348 | while (!list_empty(&ctx->defer_list)) { |
27dc8338 PB |
1349 | struct io_defer_entry *de = list_first_entry(&ctx->defer_list, |
1350 | struct io_defer_entry, list); | |
de0617e4 | 1351 | |
9cf7c104 | 1352 | if (req_need_defer(de->req, de->seq)) |
04518945 | 1353 | break; |
27dc8338 | 1354 | list_del_init(&de->list); |
907d1df3 | 1355 | io_req_task_queue(de->req); |
27dc8338 | 1356 | kfree(de); |
441b8a78 | 1357 | } |
04518945 PB |
1358 | } |
1359 | ||
360428f8 | 1360 | static void io_flush_timeouts(struct io_ring_ctx *ctx) |
de0617e4 | 1361 | { |
441b8a78 | 1362 | u32 seq = ctx->cached_cq_tail - atomic_read(&ctx->cq_timeouts); |
f010505b | 1363 | |
f18ee4cf | 1364 | while (!list_empty(&ctx->timeout_list)) { |
f010505b | 1365 | u32 events_needed, events_got; |
360428f8 | 1366 | struct io_kiocb *req = list_first_entry(&ctx->timeout_list, |
135fcde8 | 1367 | struct io_kiocb, timeout.list); |
de0617e4 | 1368 | |
8eb7e2d0 | 1369 | if (io_is_timeout_noseq(req)) |
360428f8 | 1370 | break; |
f010505b MDG |
1371 | |
1372 | /* | |
1373 | * Since seq can easily wrap around over time, subtract | |
1374 | * the last seq at which timeouts were flushed before comparing. | |
1375 | * Assuming not more than 2^31-1 events have happened since, | |
1376 | * these subtractions won't have wrapped, so we can check if | |
1377 | * target is in [last_seq, current_seq] by comparing the two. | |
1378 | */ | |
1379 | events_needed = req->timeout.target_seq - ctx->cq_last_tm_flush; | |
1380 | events_got = seq - ctx->cq_last_tm_flush; | |
1381 | if (events_got < events_needed) | |
360428f8 | 1382 | break; |
bfe68a22 | 1383 | |
135fcde8 | 1384 | list_del_init(&req->timeout.list); |
1ee4160c | 1385 | io_kill_timeout(req, 0); |
f18ee4cf | 1386 | } |
f010505b | 1387 | ctx->cq_last_tm_flush = seq; |
360428f8 | 1388 | } |
5262f567 | 1389 | |
2335f6f5 | 1390 | static void __io_commit_cqring_flush(struct io_ring_ctx *ctx) |
360428f8 | 1391 | { |
2335f6f5 PB |
1392 | if (ctx->off_timeout_used) |
1393 | io_flush_timeouts(ctx); | |
1394 | if (ctx->drain_active) | |
1395 | io_queue_deferred(ctx); | |
1396 | } | |
1397 | ||
1398 | static inline void io_commit_cqring(struct io_ring_ctx *ctx) | |
1399 | { | |
1400 | if (unlikely(ctx->off_timeout_used || ctx->drain_active)) | |
1401 | __io_commit_cqring_flush(ctx); | |
ec30e04b PB |
1402 | /* order cqe stores with ring update */ |
1403 | smp_store_release(&ctx->rings->cq.tail, ctx->cached_cq_tail); | |
de0617e4 JA |
1404 | } |
1405 | ||
90554200 JA |
1406 | static inline bool io_sqring_full(struct io_ring_ctx *ctx) |
1407 | { | |
1408 | struct io_rings *r = ctx->rings; | |
1409 | ||
a566c556 | 1410 | return READ_ONCE(r->sq.tail) - ctx->cached_sq_head == ctx->sq_entries; |
90554200 JA |
1411 | } |
1412 | ||
888aae2e PB |
1413 | static inline unsigned int __io_cqring_events(struct io_ring_ctx *ctx) |
1414 | { | |
1415 | return ctx->cached_cq_tail - READ_ONCE(ctx->rings->cq.head); | |
1416 | } | |
1417 | ||
d068b506 | 1418 | static inline struct io_uring_cqe *io_get_cqe(struct io_ring_ctx *ctx) |
2b188cc1 | 1419 | { |
75b28aff | 1420 | struct io_rings *rings = ctx->rings; |
ea5ab3b5 | 1421 | unsigned tail, mask = ctx->cq_entries - 1; |
2b188cc1 | 1422 | |
115e12e5 SB |
1423 | /* |
1424 | * writes to the cq entry need to come after reading head; the | |
1425 | * control dependency is enough as we're using WRITE_ONCE to | |
1426 | * fill the cq entry | |
1427 | */ | |
a566c556 | 1428 | if (__io_cqring_events(ctx) == ctx->cq_entries) |
2b188cc1 JA |
1429 | return NULL; |
1430 | ||
888aae2e | 1431 | tail = ctx->cached_cq_tail++; |
ea5ab3b5 | 1432 | return &rings->cqes[tail & mask]; |
2b188cc1 JA |
1433 | } |
1434 | ||
f2842ab5 JA |
1435 | static inline bool io_should_trigger_evfd(struct io_ring_ctx *ctx) |
1436 | { | |
44c769de | 1437 | if (likely(!ctx->cq_ev_fd)) |
f0b493e6 | 1438 | return false; |
7e55a19c SG |
1439 | if (READ_ONCE(ctx->rings->cq_flags) & IORING_CQ_EVENTFD_DISABLED) |
1440 | return false; | |
44c769de | 1441 | return !ctx->eventfd_async || io_wq_current_is_worker(); |
f2842ab5 JA |
1442 | } |
1443 | ||
b41e9852 | 1444 | static void io_cqring_ev_posted(struct io_ring_ctx *ctx) |
1d7bb1d5 | 1445 | { |
5fd46178 JA |
1446 | /* |
1447 | * wake_up_all() may seem excessive, but io_wake_function() and | |
1448 | * io_should_wake() handle the termination of the loop and only | |
1449 | * wake as many waiters as we need to. | |
1450 | */ | |
1451 | if (wq_has_sleeper(&ctx->cq_wait)) | |
1452 | wake_up_all(&ctx->cq_wait); | |
534ca6d6 JA |
1453 | if (ctx->sq_data && waitqueue_active(&ctx->sq_data->wait)) |
1454 | wake_up(&ctx->sq_data->wait); | |
b41e9852 | 1455 | if (io_should_trigger_evfd(ctx)) |
1d7bb1d5 | 1456 | eventfd_signal(ctx->cq_ev_fd, 1); |
311997b3 PB |
1457 | if (waitqueue_active(&ctx->poll_wait)) { |
1458 | wake_up_interruptible(&ctx->poll_wait); | |
4aa84f2f PB |
1459 | kill_fasync(&ctx->cq_fasync, SIGIO, POLL_IN); |
1460 | } | |
1d7bb1d5 JA |
1461 | } |
1462 | ||
80c18e4a PB |
1463 | static void io_cqring_ev_posted_iopoll(struct io_ring_ctx *ctx) |
1464 | { | |
1465 | if (ctx->flags & IORING_SETUP_SQPOLL) { | |
5fd46178 JA |
1466 | if (wq_has_sleeper(&ctx->cq_wait)) |
1467 | wake_up_all(&ctx->cq_wait); | |
80c18e4a PB |
1468 | } |
1469 | if (io_should_trigger_evfd(ctx)) | |
1470 | eventfd_signal(ctx->cq_ev_fd, 1); | |
311997b3 PB |
1471 | if (waitqueue_active(&ctx->poll_wait)) { |
1472 | wake_up_interruptible(&ctx->poll_wait); | |
4aa84f2f PB |
1473 | kill_fasync(&ctx->cq_fasync, SIGIO, POLL_IN); |
1474 | } | |
80c18e4a PB |
1475 | } |
1476 | ||
c4a2ed72 | 1477 | /* Returns true if there are no backlogged entries after the flush */ |
6c2450ae | 1478 | static bool __io_cqring_overflow_flush(struct io_ring_ctx *ctx, bool force) |
1d7bb1d5 | 1479 | { |
1d7bb1d5 | 1480 | unsigned long flags; |
b18032bb | 1481 | bool all_flushed, posted; |
1d7bb1d5 | 1482 | |
a566c556 | 1483 | if (!force && __io_cqring_events(ctx) == ctx->cq_entries) |
e23de15f | 1484 | return false; |
1d7bb1d5 | 1485 | |
b18032bb | 1486 | posted = false; |
1d7bb1d5 | 1487 | spin_lock_irqsave(&ctx->completion_lock, flags); |
6c2450ae | 1488 | while (!list_empty(&ctx->cq_overflow_list)) { |
d068b506 | 1489 | struct io_uring_cqe *cqe = io_get_cqe(ctx); |
6c2450ae | 1490 | struct io_overflow_cqe *ocqe; |
e6c8aa9a | 1491 | |
1d7bb1d5 JA |
1492 | if (!cqe && !force) |
1493 | break; | |
6c2450ae PB |
1494 | ocqe = list_first_entry(&ctx->cq_overflow_list, |
1495 | struct io_overflow_cqe, list); | |
1496 | if (cqe) | |
1497 | memcpy(cqe, &ocqe->cqe, sizeof(*cqe)); | |
1498 | else | |
8f6ed49a PB |
1499 | io_account_cq_overflow(ctx); |
1500 | ||
b18032bb | 1501 | posted = true; |
6c2450ae PB |
1502 | list_del(&ocqe->list); |
1503 | kfree(ocqe); | |
1d7bb1d5 JA |
1504 | } |
1505 | ||
09e88404 PB |
1506 | all_flushed = list_empty(&ctx->cq_overflow_list); |
1507 | if (all_flushed) { | |
5ed7a37d | 1508 | clear_bit(0, &ctx->check_cq_overflow); |
20c0b380 NA |
1509 | WRITE_ONCE(ctx->rings->sq_flags, |
1510 | ctx->rings->sq_flags & ~IORING_SQ_CQ_OVERFLOW); | |
09e88404 | 1511 | } |
46930143 | 1512 | |
b18032bb JA |
1513 | if (posted) |
1514 | io_commit_cqring(ctx); | |
1d7bb1d5 | 1515 | spin_unlock_irqrestore(&ctx->completion_lock, flags); |
b18032bb JA |
1516 | if (posted) |
1517 | io_cqring_ev_posted(ctx); | |
09e88404 | 1518 | return all_flushed; |
1d7bb1d5 JA |
1519 | } |
1520 | ||
6c2450ae | 1521 | static bool io_cqring_overflow_flush(struct io_ring_ctx *ctx, bool force) |
6c503150 | 1522 | { |
ca0a2651 JA |
1523 | bool ret = true; |
1524 | ||
5ed7a37d | 1525 | if (test_bit(0, &ctx->check_cq_overflow)) { |
6c503150 PB |
1526 | /* iopoll syncs against uring_lock, not completion_lock */ |
1527 | if (ctx->flags & IORING_SETUP_IOPOLL) | |
1528 | mutex_lock(&ctx->uring_lock); | |
6c2450ae | 1529 | ret = __io_cqring_overflow_flush(ctx, force); |
6c503150 PB |
1530 | if (ctx->flags & IORING_SETUP_IOPOLL) |
1531 | mutex_unlock(&ctx->uring_lock); | |
1532 | } | |
ca0a2651 JA |
1533 | |
1534 | return ret; | |
6c503150 PB |
1535 | } |
1536 | ||
abc54d63 JA |
1537 | /* |
1538 | * Shamelessly stolen from the mm implementation of page reference checking, | |
1539 | * see commit f958d7b528b1 for details. | |
1540 | */ | |
1541 | #define req_ref_zero_or_close_to_overflow(req) \ | |
1542 | ((unsigned int) atomic_read(&(req->refs)) + 127u <= 127u) | |
1543 | ||
de9b4cca JA |
1544 | static inline bool req_ref_inc_not_zero(struct io_kiocb *req) |
1545 | { | |
abc54d63 | 1546 | return atomic_inc_not_zero(&req->refs); |
de9b4cca JA |
1547 | } |
1548 | ||
1549 | static inline bool req_ref_sub_and_test(struct io_kiocb *req, int refs) | |
1550 | { | |
abc54d63 JA |
1551 | WARN_ON_ONCE(req_ref_zero_or_close_to_overflow(req)); |
1552 | return atomic_sub_and_test(refs, &req->refs); | |
de9b4cca JA |
1553 | } |
1554 | ||
1555 | static inline bool req_ref_put_and_test(struct io_kiocb *req) | |
1556 | { | |
abc54d63 JA |
1557 | WARN_ON_ONCE(req_ref_zero_or_close_to_overflow(req)); |
1558 | return atomic_dec_and_test(&req->refs); | |
de9b4cca JA |
1559 | } |
1560 | ||
1561 | static inline void req_ref_put(struct io_kiocb *req) | |
1562 | { | |
abc54d63 | 1563 | WARN_ON_ONCE(req_ref_put_and_test(req)); |
de9b4cca JA |
1564 | } |
1565 | ||
1566 | static inline void req_ref_get(struct io_kiocb *req) | |
1567 | { | |
abc54d63 JA |
1568 | WARN_ON_ONCE(req_ref_zero_or_close_to_overflow(req)); |
1569 | atomic_inc(&req->refs); | |
de9b4cca JA |
1570 | } |
1571 | ||
6a290a14 PB |
1572 | /* must to be called somewhat shortly after putting a request */ |
1573 | static inline void io_put_task(struct task_struct *task, int nr) | |
1574 | { | |
1575 | struct io_uring_task *tctx = task->io_uring; | |
1576 | ||
1577 | percpu_counter_sub(&tctx->inflight, nr); | |
1578 | if (unlikely(atomic_read(&tctx->in_idle))) | |
1579 | wake_up(&tctx->wait); | |
1580 | put_task_struct_many(task, nr); | |
1581 | } | |
1582 | ||
d4d19c19 PB |
1583 | static bool io_cqring_event_overflow(struct io_ring_ctx *ctx, u64 user_data, |
1584 | long res, unsigned int cflags) | |
2b188cc1 | 1585 | { |
cce4b8b0 | 1586 | struct io_overflow_cqe *ocqe; |
2b188cc1 | 1587 | |
cce4b8b0 PB |
1588 | ocqe = kmalloc(sizeof(*ocqe), GFP_ATOMIC | __GFP_ACCOUNT); |
1589 | if (!ocqe) { | |
1590 | /* | |
1591 | * If we're in ring overflow flush mode, or in task cancel mode, | |
1592 | * or cannot allocate an overflow entry, then we need to drop it | |
1593 | * on the floor. | |
1594 | */ | |
8f6ed49a | 1595 | io_account_cq_overflow(ctx); |
cce4b8b0 | 1596 | return false; |
2b188cc1 | 1597 | } |
cce4b8b0 | 1598 | if (list_empty(&ctx->cq_overflow_list)) { |
5ed7a37d | 1599 | set_bit(0, &ctx->check_cq_overflow); |
20c0b380 NA |
1600 | WRITE_ONCE(ctx->rings->sq_flags, |
1601 | ctx->rings->sq_flags | IORING_SQ_CQ_OVERFLOW); | |
1602 | ||
cce4b8b0 | 1603 | } |
d4d19c19 | 1604 | ocqe->cqe.user_data = user_data; |
cce4b8b0 PB |
1605 | ocqe->cqe.res = res; |
1606 | ocqe->cqe.flags = cflags; | |
1607 | list_add_tail(&ocqe->list, &ctx->cq_overflow_list); | |
1608 | return true; | |
2b188cc1 JA |
1609 | } |
1610 | ||
d4d19c19 PB |
1611 | static inline bool __io_cqring_fill_event(struct io_ring_ctx *ctx, u64 user_data, |
1612 | long res, unsigned int cflags) | |
2b188cc1 JA |
1613 | { |
1614 | struct io_uring_cqe *cqe; | |
1615 | ||
d4d19c19 | 1616 | trace_io_uring_complete(ctx, user_data, res, cflags); |
51c3ff62 | 1617 | |
2b188cc1 JA |
1618 | /* |
1619 | * If we can't get a cq entry, userspace overflowed the | |
1620 | * submission (by quite a lot). Increment the overflow count in | |
1621 | * the ring. | |
1622 | */ | |
d068b506 | 1623 | cqe = io_get_cqe(ctx); |
1d7bb1d5 | 1624 | if (likely(cqe)) { |
d4d19c19 | 1625 | WRITE_ONCE(cqe->user_data, user_data); |
2b188cc1 | 1626 | WRITE_ONCE(cqe->res, res); |
bcda7baa | 1627 | WRITE_ONCE(cqe->flags, cflags); |
8d13326e | 1628 | return true; |
2b188cc1 | 1629 | } |
d4d19c19 | 1630 | return io_cqring_event_overflow(ctx, user_data, res, cflags); |
2b188cc1 JA |
1631 | } |
1632 | ||
8d13326e | 1633 | /* not as hot to bloat with inlining */ |
d4d19c19 PB |
1634 | static noinline bool io_cqring_fill_event(struct io_ring_ctx *ctx, u64 user_data, |
1635 | long res, unsigned int cflags) | |
bcda7baa | 1636 | { |
d4d19c19 | 1637 | return __io_cqring_fill_event(ctx, user_data, res, cflags); |
bcda7baa JA |
1638 | } |
1639 | ||
7a612350 PB |
1640 | static void io_req_complete_post(struct io_kiocb *req, long res, |
1641 | unsigned int cflags) | |
2b188cc1 | 1642 | { |
78e19bbe | 1643 | struct io_ring_ctx *ctx = req->ctx; |
2b188cc1 JA |
1644 | unsigned long flags; |
1645 | ||
1646 | spin_lock_irqsave(&ctx->completion_lock, flags); | |
d4d19c19 | 1647 | __io_cqring_fill_event(ctx, req->user_data, res, cflags); |
c7dae4ba JA |
1648 | /* |
1649 | * If we're the last reference to this request, add to our locked | |
1650 | * free_list cache. | |
1651 | */ | |
de9b4cca | 1652 | if (req_ref_put_and_test(req)) { |
7a612350 | 1653 | if (req->flags & (REQ_F_LINK | REQ_F_HARDLINK)) { |
93d2bcd2 | 1654 | if (req->flags & (REQ_F_LINK_TIMEOUT | REQ_F_FAIL)) |
7a612350 PB |
1655 | io_disarm_next(req); |
1656 | if (req->link) { | |
1657 | io_req_task_queue(req->link); | |
1658 | req->link = NULL; | |
1659 | } | |
1660 | } | |
c7dae4ba JA |
1661 | io_dismantle_req(req); |
1662 | io_put_task(req->task, 1); | |
d0acdee2 PB |
1663 | list_add(&req->compl.list, &ctx->locked_free_list); |
1664 | ctx->locked_free_nr++; | |
180f829f PB |
1665 | } else { |
1666 | if (!percpu_ref_tryget(&ctx->refs)) | |
1667 | req = NULL; | |
1668 | } | |
7a612350 | 1669 | io_commit_cqring(ctx); |
2b188cc1 | 1670 | spin_unlock_irqrestore(&ctx->completion_lock, flags); |
7a612350 | 1671 | |
180f829f PB |
1672 | if (req) { |
1673 | io_cqring_ev_posted(ctx); | |
c7dae4ba | 1674 | percpu_ref_put(&ctx->refs); |
180f829f | 1675 | } |
229a7b63 JA |
1676 | } |
1677 | ||
4e3d9ff9 JA |
1678 | static inline bool io_req_needs_clean(struct io_kiocb *req) |
1679 | { | |
c854357b | 1680 | return req->flags & IO_REQ_CLEAN_FLAGS; |
4e3d9ff9 JA |
1681 | } |
1682 | ||
a38d68db | 1683 | static void io_req_complete_state(struct io_kiocb *req, long res, |
889fca73 | 1684 | unsigned int cflags) |
229a7b63 | 1685 | { |
4e3d9ff9 | 1686 | if (io_req_needs_clean(req)) |
68fb8979 | 1687 | io_clean_op(req); |
a38d68db PB |
1688 | req->result = res; |
1689 | req->compl.cflags = cflags; | |
e342c807 | 1690 | req->flags |= REQ_F_COMPLETE_INLINE; |
e1e16097 JA |
1691 | } |
1692 | ||
889fca73 PB |
1693 | static inline void __io_req_complete(struct io_kiocb *req, unsigned issue_flags, |
1694 | long res, unsigned cflags) | |
bcda7baa | 1695 | { |
889fca73 PB |
1696 | if (issue_flags & IO_URING_F_COMPLETE_DEFER) |
1697 | io_req_complete_state(req, res, cflags); | |
a38d68db | 1698 | else |
c7dae4ba | 1699 | io_req_complete_post(req, res, cflags); |
bcda7baa JA |
1700 | } |
1701 | ||
a38d68db | 1702 | static inline void io_req_complete(struct io_kiocb *req, long res) |
0ddf92e8 | 1703 | { |
889fca73 | 1704 | __io_req_complete(req, 0, res, 0); |
0ddf92e8 JA |
1705 | } |
1706 | ||
f41db273 PB |
1707 | static void io_req_complete_failed(struct io_kiocb *req, long res) |
1708 | { | |
93d2bcd2 | 1709 | req_set_fail(req); |
f41db273 PB |
1710 | io_put_req(req); |
1711 | io_req_complete_post(req, res, 0); | |
1712 | } | |
1713 | ||
864ea921 PB |
1714 | /* |
1715 | * Don't initialise the fields below on every allocation, but do that in | |
1716 | * advance and keep them valid across allocations. | |
1717 | */ | |
1718 | static void io_preinit_req(struct io_kiocb *req, struct io_ring_ctx *ctx) | |
1719 | { | |
1720 | req->ctx = ctx; | |
1721 | req->link = NULL; | |
1722 | req->async_data = NULL; | |
1723 | /* not necessary, but safer to zero */ | |
1724 | req->result = 0; | |
1725 | } | |
1726 | ||
dac7a098 PB |
1727 | static void io_flush_cached_locked_reqs(struct io_ring_ctx *ctx, |
1728 | struct io_comp_state *cs) | |
1729 | { | |
1730 | spin_lock_irq(&ctx->completion_lock); | |
d0acdee2 PB |
1731 | list_splice_init(&ctx->locked_free_list, &cs->free_list); |
1732 | ctx->locked_free_nr = 0; | |
dac7a098 PB |
1733 | spin_unlock_irq(&ctx->completion_lock); |
1734 | } | |
1735 | ||
dd78f492 | 1736 | /* Returns true IFF there are requests in the cache */ |
c7dae4ba | 1737 | static bool io_flush_cached_reqs(struct io_ring_ctx *ctx) |
0ddf92e8 | 1738 | { |
c7dae4ba JA |
1739 | struct io_submit_state *state = &ctx->submit_state; |
1740 | struct io_comp_state *cs = &state->comp; | |
dd78f492 | 1741 | int nr; |
0ddf92e8 | 1742 | |
c7dae4ba JA |
1743 | /* |
1744 | * If we have more than a batch's worth of requests in our IRQ side | |
1745 | * locked cache, grab the lock and move them over to our submission | |
1746 | * side cache. | |
1747 | */ | |
d0acdee2 | 1748 | if (READ_ONCE(ctx->locked_free_nr) > IO_COMPL_BATCH) |
dac7a098 | 1749 | io_flush_cached_locked_reqs(ctx, cs); |
0ddf92e8 | 1750 | |
dd78f492 | 1751 | nr = state->free_reqs; |
c7dae4ba | 1752 | while (!list_empty(&cs->free_list)) { |
dd78f492 PB |
1753 | struct io_kiocb *req = list_first_entry(&cs->free_list, |
1754 | struct io_kiocb, compl.list); | |
1755 | ||
1b4c351f | 1756 | list_del(&req->compl.list); |
dd78f492 PB |
1757 | state->reqs[nr++] = req; |
1758 | if (nr == ARRAY_SIZE(state->reqs)) | |
e5d1bc0a | 1759 | break; |
1b4c351f JA |
1760 | } |
1761 | ||
dd78f492 PB |
1762 | state->free_reqs = nr; |
1763 | return nr != 0; | |
0ddf92e8 JA |
1764 | } |
1765 | ||
e5d1bc0a | 1766 | static struct io_kiocb *io_alloc_req(struct io_ring_ctx *ctx) |
2b188cc1 | 1767 | { |
e5d1bc0a | 1768 | struct io_submit_state *state = &ctx->submit_state; |
864ea921 PB |
1769 | gfp_t gfp = GFP_KERNEL | __GFP_NOWARN; |
1770 | int ret, i; | |
e5d1bc0a | 1771 | |
fe7e3257 | 1772 | BUILD_BUG_ON(ARRAY_SIZE(state->reqs) < IO_REQ_ALLOC_BATCH); |
e5d1bc0a | 1773 | |
864ea921 PB |
1774 | if (likely(state->free_reqs || io_flush_cached_reqs(ctx))) |
1775 | goto got_req; | |
e5d1bc0a | 1776 | |
864ea921 PB |
1777 | ret = kmem_cache_alloc_bulk(req_cachep, gfp, IO_REQ_ALLOC_BATCH, |
1778 | state->reqs); | |
fd6fab2c | 1779 | |
864ea921 PB |
1780 | /* |
1781 | * Bulk alloc is all-or-nothing. If we fail to get a batch, | |
1782 | * retry single alloc to be on the safe side. | |
1783 | */ | |
1784 | if (unlikely(ret <= 0)) { | |
1785 | state->reqs[0] = kmem_cache_alloc(req_cachep, gfp); | |
1786 | if (!state->reqs[0]) | |
1787 | return NULL; | |
1788 | ret = 1; | |
2b188cc1 | 1789 | } |
864ea921 PB |
1790 | |
1791 | for (i = 0; i < ret; i++) | |
1792 | io_preinit_req(state->reqs[i], ctx); | |
1793 | state->free_reqs = ret; | |
e5d1bc0a | 1794 | got_req: |
291b2821 PB |
1795 | state->free_reqs--; |
1796 | return state->reqs[state->free_reqs]; | |
2b188cc1 JA |
1797 | } |
1798 | ||
e1d767f0 | 1799 | static inline void io_put_file(struct file *file) |
8da11c19 | 1800 | { |
e1d767f0 | 1801 | if (file) |
8da11c19 PB |
1802 | fput(file); |
1803 | } | |
1804 | ||
4edf20f9 | 1805 | static void io_dismantle_req(struct io_kiocb *req) |
2b188cc1 | 1806 | { |
094bae49 | 1807 | unsigned int flags = req->flags; |
929a3af9 | 1808 | |
3a0a6902 PB |
1809 | if (io_req_needs_clean(req)) |
1810 | io_clean_op(req); | |
e1d767f0 PB |
1811 | if (!(flags & REQ_F_FIXED_FILE)) |
1812 | io_put_file(req->file); | |
269bbe5f BM |
1813 | if (req->fixed_rsrc_refs) |
1814 | percpu_ref_put(req->fixed_rsrc_refs); | |
99ebe4ef | 1815 | if (req->async_data) { |
094bae49 | 1816 | kfree(req->async_data); |
99ebe4ef PB |
1817 | req->async_data = NULL; |
1818 | } | |
e65ef56d JA |
1819 | } |
1820 | ||
216578e5 | 1821 | static void __io_free_req(struct io_kiocb *req) |
c6ca97b3 | 1822 | { |
51a4cc11 | 1823 | struct io_ring_ctx *ctx = req->ctx; |
c6ca97b3 | 1824 | |
216578e5 | 1825 | io_dismantle_req(req); |
7c660731 | 1826 | io_put_task(req->task, 1); |
c6ca97b3 | 1827 | |
3893f39f | 1828 | kmem_cache_free(req_cachep, req); |
ecfc5177 | 1829 | percpu_ref_put(&ctx->refs); |
e65ef56d JA |
1830 | } |
1831 | ||
f2f87370 PB |
1832 | static inline void io_remove_next_linked(struct io_kiocb *req) |
1833 | { | |
1834 | struct io_kiocb *nxt = req->link; | |
1835 | ||
1836 | req->link = nxt->link; | |
1837 | nxt->link = NULL; | |
1838 | } | |
1839 | ||
33cc89a9 PB |
1840 | static bool io_kill_linked_timeout(struct io_kiocb *req) |
1841 | __must_hold(&req->ctx->completion_lock) | |
2665abfd | 1842 | { |
33cc89a9 | 1843 | struct io_kiocb *link = req->link; |
f2f87370 | 1844 | |
900fad45 PB |
1845 | /* |
1846 | * Can happen if a linked timeout fired and link had been like | |
1847 | * req -> link t-out -> link t-out [-> ...] | |
1848 | */ | |
c9abd7ad PB |
1849 | if (link && (link->flags & REQ_F_LTIMEOUT_ACTIVE)) { |
1850 | struct io_timeout_data *io = link->async_data; | |
7c86ffee | 1851 | |
f2f87370 | 1852 | io_remove_next_linked(req); |
90cd7e42 | 1853 | link->timeout.head = NULL; |
fd9c7bc5 | 1854 | if (hrtimer_try_to_cancel(&io->timer) != -1) { |
d4d19c19 PB |
1855 | io_cqring_fill_event(link->ctx, link->user_data, |
1856 | -ECANCELED, 0); | |
33cc89a9 | 1857 | io_put_req_deferred(link, 1); |
d4729fbd | 1858 | return true; |
c9abd7ad PB |
1859 | } |
1860 | } | |
d4729fbd | 1861 | return false; |
7c86ffee PB |
1862 | } |
1863 | ||
d148ca4b | 1864 | static void io_fail_links(struct io_kiocb *req) |
33cc89a9 | 1865 | __must_hold(&req->ctx->completion_lock) |
9e645e11 | 1866 | { |
33cc89a9 | 1867 | struct io_kiocb *nxt, *link = req->link; |
9e645e11 | 1868 | |
f2f87370 | 1869 | req->link = NULL; |
f2f87370 PB |
1870 | while (link) { |
1871 | nxt = link->link; | |
1872 | link->link = NULL; | |
2665abfd | 1873 | |
f2f87370 | 1874 | trace_io_uring_fail_link(req, link); |
d4d19c19 | 1875 | io_cqring_fill_event(link->ctx, link->user_data, -ECANCELED, 0); |
1575f21a | 1876 | io_put_req_deferred(link, 2); |
f2f87370 | 1877 | link = nxt; |
9e645e11 | 1878 | } |
33cc89a9 | 1879 | } |
9e645e11 | 1880 | |
33cc89a9 PB |
1881 | static bool io_disarm_next(struct io_kiocb *req) |
1882 | __must_hold(&req->ctx->completion_lock) | |
1883 | { | |
1884 | bool posted = false; | |
1885 | ||
1886 | if (likely(req->flags & REQ_F_LINK_TIMEOUT)) | |
1887 | posted = io_kill_linked_timeout(req); | |
93d2bcd2 | 1888 | if (unlikely((req->flags & REQ_F_FAIL) && |
e4335ed3 | 1889 | !(req->flags & REQ_F_HARDLINK))) { |
33cc89a9 PB |
1890 | posted |= (req->link != NULL); |
1891 | io_fail_links(req); | |
1892 | } | |
1893 | return posted; | |
9e645e11 JA |
1894 | } |
1895 | ||
3fa5e0f3 | 1896 | static struct io_kiocb *__io_req_find_next(struct io_kiocb *req) |
c69f8dbe | 1897 | { |
33cc89a9 | 1898 | struct io_kiocb *nxt; |
944e58bf | 1899 | |
9e645e11 JA |
1900 | /* |
1901 | * If LINK is set, we have dependent requests in this chain. If we | |
1902 | * didn't fail this request, queue the first one up, moving any other | |
1903 | * dependencies to the next request. In case of failure, fail the rest | |
1904 | * of the chain. | |
1905 | */ | |
93d2bcd2 | 1906 | if (req->flags & (REQ_F_LINK_TIMEOUT | REQ_F_FAIL)) { |
33cc89a9 PB |
1907 | struct io_ring_ctx *ctx = req->ctx; |
1908 | unsigned long flags; | |
1909 | bool posted; | |
1910 | ||
1911 | spin_lock_irqsave(&ctx->completion_lock, flags); | |
1912 | posted = io_disarm_next(req); | |
1913 | if (posted) | |
1914 | io_commit_cqring(req->ctx); | |
1915 | spin_unlock_irqrestore(&ctx->completion_lock, flags); | |
1916 | if (posted) | |
1917 | io_cqring_ev_posted(ctx); | |
f2f87370 | 1918 | } |
33cc89a9 PB |
1919 | nxt = req->link; |
1920 | req->link = NULL; | |
1921 | return nxt; | |
4d7dd462 | 1922 | } |
9e645e11 | 1923 | |
f2f87370 | 1924 | static inline struct io_kiocb *io_req_find_next(struct io_kiocb *req) |
3fa5e0f3 | 1925 | { |
cdbff982 | 1926 | if (likely(!(req->flags & (REQ_F_LINK|REQ_F_HARDLINK)))) |
3fa5e0f3 PB |
1927 | return NULL; |
1928 | return __io_req_find_next(req); | |
1929 | } | |
1930 | ||
2c32395d PB |
1931 | static void ctx_flush_and_put(struct io_ring_ctx *ctx) |
1932 | { | |
1933 | if (!ctx) | |
1934 | return; | |
1935 | if (ctx->submit_state.comp.nr) { | |
1936 | mutex_lock(&ctx->uring_lock); | |
2a2758f2 | 1937 | io_submit_flush_completions(ctx); |
2c32395d PB |
1938 | mutex_unlock(&ctx->uring_lock); |
1939 | } | |
1940 | percpu_ref_put(&ctx->refs); | |
1941 | } | |
1942 | ||
7cbf1722 | 1943 | static void tctx_task_work(struct callback_head *cb) |
c40f6379 | 1944 | { |
ebd0df2e | 1945 | struct io_ring_ctx *ctx = NULL; |
3f18407d PB |
1946 | struct io_uring_task *tctx = container_of(cb, struct io_uring_task, |
1947 | task_work); | |
c40f6379 | 1948 | |
16f72070 | 1949 | while (1) { |
3f18407d PB |
1950 | struct io_wq_work_node *node; |
1951 | ||
1952 | spin_lock_irq(&tctx->task_lock); | |
c6538be9 | 1953 | node = tctx->task_list.first; |
3f18407d PB |
1954 | INIT_WQ_LIST(&tctx->task_list); |
1955 | spin_unlock_irq(&tctx->task_lock); | |
1956 | ||
3f18407d PB |
1957 | while (node) { |
1958 | struct io_wq_work_node *next = node->next; | |
1959 | struct io_kiocb *req = container_of(node, struct io_kiocb, | |
1960 | io_task_work.node); | |
1961 | ||
1962 | if (req->ctx != ctx) { | |
1963 | ctx_flush_and_put(ctx); | |
1964 | ctx = req->ctx; | |
1965 | percpu_ref_get(&ctx->refs); | |
1966 | } | |
5b0a6acc | 1967 | req->io_task_work.func(req); |
3f18407d PB |
1968 | node = next; |
1969 | } | |
7a778f9d | 1970 | if (wq_list_empty(&tctx->task_list)) { |
110aa25c | 1971 | spin_lock_irq(&tctx->task_lock); |
7a778f9d | 1972 | clear_bit(0, &tctx->task_state); |
110aa25c JA |
1973 | if (wq_list_empty(&tctx->task_list)) { |
1974 | spin_unlock_irq(&tctx->task_lock); | |
7a778f9d | 1975 | break; |
110aa25c JA |
1976 | } |
1977 | spin_unlock_irq(&tctx->task_lock); | |
7a778f9d PB |
1978 | /* another tctx_task_work() is enqueued, yield */ |
1979 | if (test_and_set_bit(0, &tctx->task_state)) | |
1980 | break; | |
1981 | } | |
7cbf1722 | 1982 | cond_resched(); |
3f18407d | 1983 | } |
ebd0df2e PB |
1984 | |
1985 | ctx_flush_and_put(ctx); | |
7cbf1722 JA |
1986 | } |
1987 | ||
e09ee510 | 1988 | static void io_req_task_work_add(struct io_kiocb *req) |
7cbf1722 | 1989 | { |
c15b79de | 1990 | struct task_struct *tsk = req->task; |
7cbf1722 | 1991 | struct io_uring_task *tctx = tsk->io_uring; |
c15b79de | 1992 | enum task_work_notify_mode notify; |
e09ee510 | 1993 | struct io_wq_work_node *node; |
0b81e80c | 1994 | unsigned long flags; |
7cbf1722 JA |
1995 | |
1996 | WARN_ON_ONCE(!tctx); | |
1997 | ||
0b81e80c | 1998 | spin_lock_irqsave(&tctx->task_lock, flags); |
7cbf1722 | 1999 | wq_list_add_tail(&req->io_task_work.node, &tctx->task_list); |
0b81e80c | 2000 | spin_unlock_irqrestore(&tctx->task_lock, flags); |
7cbf1722 JA |
2001 | |
2002 | /* task_work already pending, we're done */ | |
2003 | if (test_bit(0, &tctx->task_state) || | |
2004 | test_and_set_bit(0, &tctx->task_state)) | |
e09ee510 | 2005 | return; |
7cbf1722 | 2006 | |
c15b79de PB |
2007 | /* |
2008 | * SQPOLL kernel thread doesn't need notification, just a wakeup. For | |
2009 | * all other cases, use TWA_SIGNAL unconditionally to ensure we're | |
2010 | * processing task_work. There's no reliable way to tell if TWA_RESUME | |
2011 | * will do the job. | |
2012 | */ | |
2013 | notify = (req->ctx->flags & IORING_SETUP_SQPOLL) ? TWA_NONE : TWA_SIGNAL; | |
c15b79de PB |
2014 | if (!task_work_add(tsk, &tctx->task_work, notify)) { |
2015 | wake_up_process(tsk); | |
e09ee510 | 2016 | return; |
c15b79de | 2017 | } |
2215bed9 | 2018 | |
e09ee510 | 2019 | clear_bit(0, &tctx->task_state); |
0b81e80c | 2020 | spin_lock_irqsave(&tctx->task_lock, flags); |
e09ee510 PB |
2021 | node = tctx->task_list.first; |
2022 | INIT_WQ_LIST(&tctx->task_list); | |
0b81e80c | 2023 | spin_unlock_irqrestore(&tctx->task_lock, flags); |
7cbf1722 | 2024 | |
e09ee510 PB |
2025 | while (node) { |
2026 | req = container_of(node, struct io_kiocb, io_task_work.node); | |
2027 | node = node->next; | |
2028 | if (llist_add(&req->io_task_work.fallback_node, | |
2029 | &req->ctx->fallback_llist)) | |
2030 | schedule_delayed_work(&req->ctx->fallback_work, 1); | |
2031 | } | |
eab30c4d PB |
2032 | } |
2033 | ||
5b0a6acc | 2034 | static void io_req_task_cancel(struct io_kiocb *req) |
c40f6379 | 2035 | { |
87ceb6a6 | 2036 | struct io_ring_ctx *ctx = req->ctx; |
c40f6379 | 2037 | |
e83acd7d | 2038 | /* ctx is guaranteed to stay alive while we hold uring_lock */ |
792bb6eb | 2039 | mutex_lock(&ctx->uring_lock); |
2593553a | 2040 | io_req_complete_failed(req, req->result); |
792bb6eb | 2041 | mutex_unlock(&ctx->uring_lock); |
c40f6379 JA |
2042 | } |
2043 | ||
5b0a6acc | 2044 | static void io_req_task_submit(struct io_kiocb *req) |
c40f6379 JA |
2045 | { |
2046 | struct io_ring_ctx *ctx = req->ctx; | |
2047 | ||
04fc6c80 | 2048 | /* ctx stays valid until unlock, even if we drop all ours ctx->refs */ |
81b6d05c | 2049 | mutex_lock(&ctx->uring_lock); |
9c688260 | 2050 | if (!(req->task->flags & PF_EXITING) && !req->task->in_execve) |
c5eef2b9 | 2051 | __io_queue_sqe(req); |
81b6d05c | 2052 | else |
2593553a | 2053 | io_req_complete_failed(req, -EFAULT); |
81b6d05c | 2054 | mutex_unlock(&ctx->uring_lock); |
c40f6379 JA |
2055 | } |
2056 | ||
2c4b8eb6 | 2057 | static void io_req_task_queue_fail(struct io_kiocb *req, int ret) |
c40f6379 | 2058 | { |
2c4b8eb6 | 2059 | req->result = ret; |
5b0a6acc | 2060 | req->io_task_work.func = io_req_task_cancel; |
e09ee510 | 2061 | io_req_task_work_add(req); |
c40f6379 JA |
2062 | } |
2063 | ||
2c4b8eb6 | 2064 | static void io_req_task_queue(struct io_kiocb *req) |
a3df7698 | 2065 | { |
5b0a6acc | 2066 | req->io_task_work.func = io_req_task_submit; |
e09ee510 | 2067 | io_req_task_work_add(req); |
a3df7698 PB |
2068 | } |
2069 | ||
773af691 JA |
2070 | static void io_req_task_queue_reissue(struct io_kiocb *req) |
2071 | { | |
2072 | req->io_task_work.func = io_queue_async_work; | |
2073 | io_req_task_work_add(req); | |
2074 | } | |
2075 | ||
f2f87370 | 2076 | static inline void io_queue_next(struct io_kiocb *req) |
c69f8dbe | 2077 | { |
9b5f7bd9 | 2078 | struct io_kiocb *nxt = io_req_find_next(req); |
944e58bf PB |
2079 | |
2080 | if (nxt) | |
906a8c3f | 2081 | io_req_task_queue(nxt); |
c69f8dbe JL |
2082 | } |
2083 | ||
c3524383 | 2084 | static void io_free_req(struct io_kiocb *req) |
7a743e22 | 2085 | { |
c3524383 PB |
2086 | io_queue_next(req); |
2087 | __io_free_req(req); | |
2088 | } | |
8766dd51 | 2089 | |
2d6500d4 | 2090 | struct req_batch { |
5af1d13e PB |
2091 | struct task_struct *task; |
2092 | int task_refs; | |
1b4c351f | 2093 | int ctx_refs; |
2d6500d4 PB |
2094 | }; |
2095 | ||
5af1d13e PB |
2096 | static inline void io_init_req_batch(struct req_batch *rb) |
2097 | { | |
5af1d13e | 2098 | rb->task_refs = 0; |
9ae72463 | 2099 | rb->ctx_refs = 0; |
5af1d13e PB |
2100 | rb->task = NULL; |
2101 | } | |
2102 | ||
2d6500d4 PB |
2103 | static void io_req_free_batch_finish(struct io_ring_ctx *ctx, |
2104 | struct req_batch *rb) | |
2105 | { | |
6e833d53 | 2106 | if (rb->task) |
7c660731 | 2107 | io_put_task(rb->task, rb->task_refs); |
9ae72463 PB |
2108 | if (rb->ctx_refs) |
2109 | percpu_ref_put_many(&ctx->refs, rb->ctx_refs); | |
2d6500d4 PB |
2110 | } |
2111 | ||
6ff119a6 PB |
2112 | static void io_req_free_batch(struct req_batch *rb, struct io_kiocb *req, |
2113 | struct io_submit_state *state) | |
2d6500d4 | 2114 | { |
f2f87370 | 2115 | io_queue_next(req); |
96670657 | 2116 | io_dismantle_req(req); |
2d6500d4 | 2117 | |
e3bc8e9d | 2118 | if (req->task != rb->task) { |
7c660731 PB |
2119 | if (rb->task) |
2120 | io_put_task(rb->task, rb->task_refs); | |
e3bc8e9d JA |
2121 | rb->task = req->task; |
2122 | rb->task_refs = 0; | |
5af1d13e | 2123 | } |
e3bc8e9d | 2124 | rb->task_refs++; |
9ae72463 | 2125 | rb->ctx_refs++; |
5af1d13e | 2126 | |
bd759045 | 2127 | if (state->free_reqs != ARRAY_SIZE(state->reqs)) |
6ff119a6 | 2128 | state->reqs[state->free_reqs++] = req; |
bd759045 PB |
2129 | else |
2130 | list_add(&req->compl.list, &state->comp.free_list); | |
7a743e22 PB |
2131 | } |
2132 | ||
2a2758f2 | 2133 | static void io_submit_flush_completions(struct io_ring_ctx *ctx) |
282cdc86 | 2134 | __must_hold(&req->ctx->uring_lock) |
905c172f | 2135 | { |
2a2758f2 | 2136 | struct io_comp_state *cs = &ctx->submit_state.comp; |
905c172f | 2137 | int i, nr = cs->nr; |
905c172f PB |
2138 | struct req_batch rb; |
2139 | ||
905c172f PB |
2140 | spin_lock_irq(&ctx->completion_lock); |
2141 | for (i = 0; i < nr; i++) { | |
5182ed2e PB |
2142 | struct io_kiocb *req = cs->reqs[i]; |
2143 | ||
d4d19c19 PB |
2144 | __io_cqring_fill_event(ctx, req->user_data, req->result, |
2145 | req->compl.cflags); | |
905c172f PB |
2146 | } |
2147 | io_commit_cqring(ctx); | |
2148 | spin_unlock_irq(&ctx->completion_lock); | |
905c172f | 2149 | io_cqring_ev_posted(ctx); |
5182ed2e PB |
2150 | |
2151 | io_init_req_batch(&rb); | |
905c172f | 2152 | for (i = 0; i < nr; i++) { |
5182ed2e | 2153 | struct io_kiocb *req = cs->reqs[i]; |
905c172f PB |
2154 | |
2155 | /* submission and completion refs */ | |
de9b4cca | 2156 | if (req_ref_sub_and_test(req, 2)) |
6ff119a6 | 2157 | io_req_free_batch(&rb, req, &ctx->submit_state); |
905c172f PB |
2158 | } |
2159 | ||
2160 | io_req_free_batch_finish(ctx, &rb); | |
2161 | cs->nr = 0; | |
7a743e22 PB |
2162 | } |
2163 | ||
ba816ad6 JA |
2164 | /* |
2165 | * Drop reference to request, return next in chain (if there is one) if this | |
2166 | * was the last reference to this request. | |
2167 | */ | |
0d85035a | 2168 | static inline struct io_kiocb *io_put_req_find_next(struct io_kiocb *req) |
e65ef56d | 2169 | { |
9b5f7bd9 PB |
2170 | struct io_kiocb *nxt = NULL; |
2171 | ||
de9b4cca | 2172 | if (req_ref_put_and_test(req)) { |
9b5f7bd9 | 2173 | nxt = io_req_find_next(req); |
4d7dd462 | 2174 | __io_free_req(req); |
2a44f467 | 2175 | } |
9b5f7bd9 | 2176 | return nxt; |
2b188cc1 JA |
2177 | } |
2178 | ||
0d85035a | 2179 | static inline void io_put_req(struct io_kiocb *req) |
e65ef56d | 2180 | { |
de9b4cca | 2181 | if (req_ref_put_and_test(req)) |
e65ef56d | 2182 | io_free_req(req); |
2b188cc1 JA |
2183 | } |
2184 | ||
216578e5 PB |
2185 | static void io_free_req_deferred(struct io_kiocb *req) |
2186 | { | |
5b0a6acc | 2187 | req->io_task_work.func = io_free_req; |
e09ee510 | 2188 | io_req_task_work_add(req); |
216578e5 PB |
2189 | } |
2190 | ||
2191 | static inline void io_put_req_deferred(struct io_kiocb *req, int refs) | |
2192 | { | |
de9b4cca | 2193 | if (req_ref_sub_and_test(req, refs)) |
216578e5 PB |
2194 | io_free_req_deferred(req); |
2195 | } | |
2196 | ||
6c503150 | 2197 | static unsigned io_cqring_events(struct io_ring_ctx *ctx) |
a3a0e43f JA |
2198 | { |
2199 | /* See comment at the top of this file */ | |
2200 | smp_rmb(); | |
e23de15f | 2201 | return __io_cqring_events(ctx); |
a3a0e43f JA |
2202 | } |
2203 | ||
fb5ccc98 PB |
2204 | static inline unsigned int io_sqring_entries(struct io_ring_ctx *ctx) |
2205 | { | |
2206 | struct io_rings *rings = ctx->rings; | |
2207 | ||
2208 | /* make sure SQ entry isn't read before tail */ | |
2209 | return smp_load_acquire(&rings->sq.tail) - ctx->cached_sq_head; | |
2210 | } | |
2211 | ||
8ff069bf | 2212 | static unsigned int io_put_kbuf(struct io_kiocb *req, struct io_buffer *kbuf) |
e94f141b | 2213 | { |
8ff069bf | 2214 | unsigned int cflags; |
e94f141b | 2215 | |
bcda7baa JA |
2216 | cflags = kbuf->bid << IORING_CQE_BUFFER_SHIFT; |
2217 | cflags |= IORING_CQE_F_BUFFER; | |
0e1b6fe3 | 2218 | req->flags &= ~REQ_F_BUFFER_SELECTED; |
bcda7baa JA |
2219 | kfree(kbuf); |
2220 | return cflags; | |
e94f141b JA |
2221 | } |
2222 | ||
8ff069bf | 2223 | static inline unsigned int io_put_rw_kbuf(struct io_kiocb *req) |
bcda7baa | 2224 | { |
4d954c25 | 2225 | struct io_buffer *kbuf; |
bcda7baa | 2226 | |
4d954c25 | 2227 | kbuf = (struct io_buffer *) (unsigned long) req->rw.addr; |
8ff069bf PB |
2228 | return io_put_kbuf(req, kbuf); |
2229 | } | |
2230 | ||
4c6e277c JA |
2231 | static inline bool io_run_task_work(void) |
2232 | { | |
ef98eb04 | 2233 | if (test_thread_flag(TIF_NOTIFY_SIGNAL) || current->task_works) { |
4c6e277c | 2234 | __set_current_state(TASK_RUNNING); |
ef98eb04 | 2235 | tracehook_notify_signal(); |
4c6e277c JA |
2236 | return true; |
2237 | } | |
2238 | ||
2239 | return false; | |
bcda7baa JA |
2240 | } |
2241 | ||
def596e9 JA |
2242 | /* |
2243 | * Find and free completed poll iocbs | |
2244 | */ | |
2245 | static void io_iopoll_complete(struct io_ring_ctx *ctx, unsigned int *nr_events, | |
3c30ef0f | 2246 | struct list_head *done, bool resubmit) |
def596e9 | 2247 | { |
8237e045 | 2248 | struct req_batch rb; |
def596e9 | 2249 | struct io_kiocb *req; |
bbde017a XW |
2250 | |
2251 | /* order with ->result store in io_complete_rw_iopoll() */ | |
2252 | smp_rmb(); | |
def596e9 | 2253 | |
5af1d13e | 2254 | io_init_req_batch(&rb); |
def596e9 | 2255 | while (!list_empty(done)) { |
bcda7baa JA |
2256 | int cflags = 0; |
2257 | ||
d21ffe7e | 2258 | req = list_first_entry(done, struct io_kiocb, inflight_entry); |
f161340d PB |
2259 | list_del(&req->inflight_entry); |
2260 | ||
3c30ef0f | 2261 | if (READ_ONCE(req->result) == -EAGAIN && resubmit && |
8c130827 | 2262 | !(req->flags & REQ_F_DONT_REISSUE)) { |
bbde017a | 2263 | req->iopoll_completed = 0; |
8c130827 | 2264 | req_ref_get(req); |
773af691 | 2265 | io_req_task_queue_reissue(req); |
8c130827 | 2266 | continue; |
bbde017a | 2267 | } |
def596e9 | 2268 | |
bcda7baa | 2269 | if (req->flags & REQ_F_BUFFER_SELECTED) |
8ff069bf | 2270 | cflags = io_put_rw_kbuf(req); |
bcda7baa | 2271 | |
d4d19c19 | 2272 | __io_cqring_fill_event(ctx, req->user_data, req->result, cflags); |
def596e9 JA |
2273 | (*nr_events)++; |
2274 | ||
de9b4cca | 2275 | if (req_ref_put_and_test(req)) |
6ff119a6 | 2276 | io_req_free_batch(&rb, req, &ctx->submit_state); |
def596e9 | 2277 | } |
def596e9 | 2278 | |
09bb8394 | 2279 | io_commit_cqring(ctx); |
80c18e4a | 2280 | io_cqring_ev_posted_iopoll(ctx); |
2d6500d4 | 2281 | io_req_free_batch_finish(ctx, &rb); |
581f9810 BM |
2282 | } |
2283 | ||
def596e9 | 2284 | static int io_do_iopoll(struct io_ring_ctx *ctx, unsigned int *nr_events, |
3c30ef0f | 2285 | long min, bool resubmit) |
def596e9 JA |
2286 | { |
2287 | struct io_kiocb *req, *tmp; | |
2288 | LIST_HEAD(done); | |
2289 | bool spin; | |
def596e9 JA |
2290 | |
2291 | /* | |
2292 | * Only spin for completions if we don't have multiple devices hanging | |
2293 | * off our complete list, and we're under the requested amount. | |
2294 | */ | |
915b3dde | 2295 | spin = !ctx->poll_multi_queue && *nr_events < min; |
def596e9 | 2296 | |
d21ffe7e | 2297 | list_for_each_entry_safe(req, tmp, &ctx->iopoll_list, inflight_entry) { |
9adbd45d | 2298 | struct kiocb *kiocb = &req->rw.kiocb; |
a2416e1e | 2299 | int ret; |
def596e9 JA |
2300 | |
2301 | /* | |
581f9810 BM |
2302 | * Move completed and retryable entries to our local lists. |
2303 | * If we find a request that requires polling, break out | |
2304 | * and complete those lists first, if we have entries there. | |
def596e9 | 2305 | */ |
65a6543d | 2306 | if (READ_ONCE(req->iopoll_completed)) { |
d21ffe7e | 2307 | list_move_tail(&req->inflight_entry, &done); |
def596e9 JA |
2308 | continue; |
2309 | } | |
2310 | if (!list_empty(&done)) | |
2311 | break; | |
2312 | ||
2313 | ret = kiocb->ki_filp->f_op->iopoll(kiocb, spin); | |
a2416e1e PB |
2314 | if (unlikely(ret < 0)) |
2315 | return ret; | |
2316 | else if (ret) | |
2317 | spin = false; | |
def596e9 | 2318 | |
3aadc23e PB |
2319 | /* iopoll may have completed current req */ |
2320 | if (READ_ONCE(req->iopoll_completed)) | |
d21ffe7e | 2321 | list_move_tail(&req->inflight_entry, &done); |
def596e9 JA |
2322 | } |
2323 | ||
2324 | if (!list_empty(&done)) | |
3c30ef0f | 2325 | io_iopoll_complete(ctx, nr_events, &done, resubmit); |
def596e9 | 2326 | |
a2416e1e | 2327 | return 0; |
def596e9 JA |
2328 | } |
2329 | ||
def596e9 JA |
2330 | /* |
2331 | * We can't just wait for polled events to come to us, we have to actively | |
2332 | * find and complete them. | |
2333 | */ | |
b2edc0a7 | 2334 | static void io_iopoll_try_reap_events(struct io_ring_ctx *ctx) |
def596e9 JA |
2335 | { |
2336 | if (!(ctx->flags & IORING_SETUP_IOPOLL)) | |
2337 | return; | |
2338 | ||
2339 | mutex_lock(&ctx->uring_lock); | |
540e32a0 | 2340 | while (!list_empty(&ctx->iopoll_list)) { |
def596e9 JA |
2341 | unsigned int nr_events = 0; |
2342 | ||
3c30ef0f | 2343 | io_do_iopoll(ctx, &nr_events, 0, false); |
08f5439f | 2344 | |
b2edc0a7 PB |
2345 | /* let it sleep and repeat later if can't complete a request */ |
2346 | if (nr_events == 0) | |
2347 | break; | |
08f5439f JA |
2348 | /* |
2349 | * Ensure we allow local-to-the-cpu processing to take place, | |
2350 | * in this case we need to ensure that we reap all events. | |
3fcee5a6 | 2351 | * Also let task_work, etc. to progress by releasing the mutex |
08f5439f | 2352 | */ |
3fcee5a6 PB |
2353 | if (need_resched()) { |
2354 | mutex_unlock(&ctx->uring_lock); | |
2355 | cond_resched(); | |
2356 | mutex_lock(&ctx->uring_lock); | |
2357 | } | |
def596e9 JA |
2358 | } |
2359 | mutex_unlock(&ctx->uring_lock); | |
2360 | } | |
2361 | ||
7668b92a | 2362 | static int io_iopoll_check(struct io_ring_ctx *ctx, long min) |
def596e9 | 2363 | { |
7668b92a | 2364 | unsigned int nr_events = 0; |
e9979b36 | 2365 | int ret = 0; |
500f9fba | 2366 | |
c7849be9 XW |
2367 | /* |
2368 | * We disallow the app entering submit/complete with polling, but we | |
2369 | * still need to lock the ring to prevent racing with polled issue | |
2370 | * that got punted to a workqueue. | |
2371 | */ | |
2372 | mutex_lock(&ctx->uring_lock); | |
f39c8a5b PB |
2373 | /* |
2374 | * Don't enter poll loop if we already have events pending. | |
2375 | * If we do, we can potentially be spinning for commands that | |
2376 | * already triggered a CQE (eg in error). | |
2377 | */ | |
5ed7a37d | 2378 | if (test_bit(0, &ctx->check_cq_overflow)) |
f39c8a5b PB |
2379 | __io_cqring_overflow_flush(ctx, false); |
2380 | if (io_cqring_events(ctx)) | |
2381 | goto out; | |
def596e9 | 2382 | do { |
500f9fba JA |
2383 | /* |
2384 | * If a submit got punted to a workqueue, we can have the | |
2385 | * application entering polling for a command before it gets | |
2386 | * issued. That app will hold the uring_lock for the duration | |
2387 | * of the poll right here, so we need to take a breather every | |
2388 | * now and then to ensure that the issue has a chance to add | |
2389 | * the poll to the issued list. Otherwise we can spin here | |
2390 | * forever, while the workqueue is stuck trying to acquire the | |
2391 | * very same mutex. | |
2392 | */ | |
e9979b36 | 2393 | if (list_empty(&ctx->iopoll_list)) { |
8f487ef2 PB |
2394 | u32 tail = ctx->cached_cq_tail; |
2395 | ||
500f9fba | 2396 | mutex_unlock(&ctx->uring_lock); |
4c6e277c | 2397 | io_run_task_work(); |
500f9fba | 2398 | mutex_lock(&ctx->uring_lock); |
def596e9 | 2399 | |
8f487ef2 PB |
2400 | /* some requests don't go through iopoll_list */ |
2401 | if (tail != ctx->cached_cq_tail || | |
2402 | list_empty(&ctx->iopoll_list)) | |
e9979b36 | 2403 | break; |
500f9fba | 2404 | } |
3c30ef0f | 2405 | ret = io_do_iopoll(ctx, &nr_events, min, true); |
f39c8a5b PB |
2406 | } while (!ret && nr_events < min && !need_resched()); |
2407 | out: | |
500f9fba | 2408 | mutex_unlock(&ctx->uring_lock); |
def596e9 JA |
2409 | return ret; |
2410 | } | |
2411 | ||
491381ce | 2412 | static void kiocb_end_write(struct io_kiocb *req) |
2b188cc1 | 2413 | { |
491381ce JA |
2414 | /* |
2415 | * Tell lockdep we inherited freeze protection from submission | |
2416 | * thread. | |
2417 | */ | |
2418 | if (req->flags & REQ_F_ISREG) { | |
1c98679d | 2419 | struct super_block *sb = file_inode(req->file)->i_sb; |
2b188cc1 | 2420 | |
1c98679d PB |
2421 | __sb_writers_acquired(sb, SB_FREEZE_WRITE); |
2422 | sb_end_write(sb); | |
2b188cc1 JA |
2423 | } |
2424 | } | |
2425 | ||
b63534c4 | 2426 | #ifdef CONFIG_BLOCK |
dc2a6e9a | 2427 | static bool io_resubmit_prep(struct io_kiocb *req) |
b63534c4 | 2428 | { |
ab454438 | 2429 | struct io_async_rw *rw = req->async_data; |
b63534c4 | 2430 | |
ab454438 PB |
2431 | if (!rw) |
2432 | return !io_req_prep_async(req); | |
2433 | /* may have left rw->iter inconsistent on -EIOCBQUEUED */ | |
2434 | iov_iter_revert(&rw->iter, req->result - iov_iter_count(&rw->iter)); | |
2435 | return true; | |
b63534c4 | 2436 | } |
b63534c4 | 2437 | |
3e6a0d3c | 2438 | static bool io_rw_should_reissue(struct io_kiocb *req) |
b63534c4 | 2439 | { |
355afaeb | 2440 | umode_t mode = file_inode(req->file)->i_mode; |
3e6a0d3c | 2441 | struct io_ring_ctx *ctx = req->ctx; |
b63534c4 | 2442 | |
355afaeb JA |
2443 | if (!S_ISBLK(mode) && !S_ISREG(mode)) |
2444 | return false; | |
3e6a0d3c JA |
2445 | if ((req->flags & REQ_F_NOWAIT) || (io_wq_current_is_worker() && |
2446 | !(ctx->flags & IORING_SETUP_IOPOLL))) | |
b63534c4 | 2447 | return false; |
7c977a58 JA |
2448 | /* |
2449 | * If ref is dying, we might be running poll reap from the exit work. | |
2450 | * Don't attempt to reissue from that path, just let it fail with | |
2451 | * -EAGAIN. | |
2452 | */ | |
3e6a0d3c JA |
2453 | if (percpu_ref_is_dying(&ctx->refs)) |
2454 | return false; | |
ef046888 JA |
2455 | /* |
2456 | * Play it safe and assume not safe to re-import and reissue if we're | |
2457 | * not in the original thread group (or in task context). | |
2458 | */ | |
2459 | if (!same_thread_group(req->task, current) || !in_task()) | |
2460 | return false; | |
3e6a0d3c JA |
2461 | return true; |
2462 | } | |
e82ad485 | 2463 | #else |
a1ff1e3f | 2464 | static bool io_resubmit_prep(struct io_kiocb *req) |
e82ad485 JA |
2465 | { |
2466 | return false; | |
2467 | } | |
e82ad485 | 2468 | static bool io_rw_should_reissue(struct io_kiocb *req) |
3e6a0d3c | 2469 | { |
b63534c4 JA |
2470 | return false; |
2471 | } | |
3e6a0d3c | 2472 | #endif |
b63534c4 | 2473 | |
9011bf9a PB |
2474 | static void io_fallback_req_func(struct work_struct *work) |
2475 | { | |
2476 | struct io_ring_ctx *ctx = container_of(work, struct io_ring_ctx, | |
2477 | fallback_work.work); | |
2478 | struct llist_node *node = llist_del_all(&ctx->fallback_llist); | |
2479 | struct io_kiocb *req, *tmp; | |
2480 | ||
9cb0073b | 2481 | percpu_ref_get(&ctx->refs); |
5b0a6acc PB |
2482 | llist_for_each_entry_safe(req, tmp, node, io_task_work.fallback_node) |
2483 | req->io_task_work.func(req); | |
9cb0073b | 2484 | percpu_ref_put(&ctx->refs); |
9011bf9a PB |
2485 | } |
2486 | ||
a1d7c393 | 2487 | static void __io_complete_rw(struct io_kiocb *req, long res, long res2, |
889fca73 | 2488 | unsigned int issue_flags) |
a1d7c393 | 2489 | { |
2f8e45f1 PB |
2490 | int cflags = 0; |
2491 | ||
b65c128f PB |
2492 | if (req->rw.kiocb.ki_flags & IOCB_WRITE) |
2493 | kiocb_end_write(req); | |
9532b99b PB |
2494 | if (res != req->result) { |
2495 | if ((res == -EAGAIN || res == -EOPNOTSUPP) && | |
2496 | io_rw_should_reissue(req)) { | |
2497 | req->flags |= REQ_F_REISSUE; | |
2498 | return; | |
2499 | } | |
93d2bcd2 | 2500 | req_set_fail(req); |
9532b99b | 2501 | } |
2f8e45f1 PB |
2502 | if (req->flags & REQ_F_BUFFER_SELECTED) |
2503 | cflags = io_put_rw_kbuf(req); | |
2504 | __io_req_complete(req, issue_flags, res, cflags); | |
ba816ad6 JA |
2505 | } |
2506 | ||
2507 | static void io_complete_rw(struct kiocb *kiocb, long res, long res2) | |
2508 | { | |
9adbd45d | 2509 | struct io_kiocb *req = container_of(kiocb, struct io_kiocb, rw.kiocb); |
ba816ad6 | 2510 | |
889fca73 | 2511 | __io_complete_rw(req, res, res2, 0); |
2b188cc1 JA |
2512 | } |
2513 | ||
def596e9 JA |
2514 | static void io_complete_rw_iopoll(struct kiocb *kiocb, long res, long res2) |
2515 | { | |
9adbd45d | 2516 | struct io_kiocb *req = container_of(kiocb, struct io_kiocb, rw.kiocb); |
def596e9 | 2517 | |
491381ce JA |
2518 | if (kiocb->ki_flags & IOCB_WRITE) |
2519 | kiocb_end_write(req); | |
9532b99b | 2520 | if (unlikely(res != req->result)) { |
a1ff1e3f JA |
2521 | if (!(res == -EAGAIN && io_rw_should_reissue(req) && |
2522 | io_resubmit_prep(req))) { | |
93d2bcd2 | 2523 | req_set_fail(req); |
9532b99b PB |
2524 | req->flags |= REQ_F_DONT_REISSUE; |
2525 | } | |
8c130827 | 2526 | } |
bbde017a XW |
2527 | |
2528 | WRITE_ONCE(req->result, res); | |
b9b0e0d3 | 2529 | /* order with io_iopoll_complete() checking ->result */ |
cd664b0e PB |
2530 | smp_wmb(); |
2531 | WRITE_ONCE(req->iopoll_completed, 1); | |
def596e9 JA |
2532 | } |
2533 | ||
2534 | /* | |
2535 | * After the iocb has been issued, it's safe to be found on the poll list. | |
2536 | * Adding the kiocb to the list AFTER submission ensures that we don't | |
f39c8a5b | 2537 | * find it from a io_do_iopoll() thread before the issuer is done |
def596e9 JA |
2538 | * accessing the kiocb cookie. |
2539 | */ | |
cb3d8972 | 2540 | static void io_iopoll_req_issued(struct io_kiocb *req) |
def596e9 JA |
2541 | { |
2542 | struct io_ring_ctx *ctx = req->ctx; | |
cb3d8972 PB |
2543 | const bool in_async = io_wq_current_is_worker(); |
2544 | ||
2545 | /* workqueue context doesn't hold uring_lock, grab it now */ | |
2546 | if (unlikely(in_async)) | |
2547 | mutex_lock(&ctx->uring_lock); | |
def596e9 JA |
2548 | |
2549 | /* | |
2550 | * Track whether we have multiple files in our lists. This will impact | |
2551 | * how we do polling eventually, not spinning if we're on potentially | |
2552 | * different devices. | |
2553 | */ | |
540e32a0 | 2554 | if (list_empty(&ctx->iopoll_list)) { |
915b3dde HX |
2555 | ctx->poll_multi_queue = false; |
2556 | } else if (!ctx->poll_multi_queue) { | |
def596e9 | 2557 | struct io_kiocb *list_req; |
915b3dde | 2558 | unsigned int queue_num0, queue_num1; |
def596e9 | 2559 | |
540e32a0 | 2560 | list_req = list_first_entry(&ctx->iopoll_list, struct io_kiocb, |
d21ffe7e | 2561 | inflight_entry); |
915b3dde HX |
2562 | |
2563 | if (list_req->file != req->file) { | |
2564 | ctx->poll_multi_queue = true; | |
2565 | } else { | |
2566 | queue_num0 = blk_qc_t_to_queue_num(list_req->rw.kiocb.ki_cookie); | |
2567 | queue_num1 = blk_qc_t_to_queue_num(req->rw.kiocb.ki_cookie); | |
2568 | if (queue_num0 != queue_num1) | |
2569 | ctx->poll_multi_queue = true; | |
2570 | } | |
def596e9 JA |
2571 | } |
2572 | ||
2573 | /* | |
2574 | * For fast devices, IO may have already completed. If it has, add | |
2575 | * it to the front so we find it first. | |
2576 | */ | |
65a6543d | 2577 | if (READ_ONCE(req->iopoll_completed)) |
d21ffe7e | 2578 | list_add(&req->inflight_entry, &ctx->iopoll_list); |
def596e9 | 2579 | else |
d21ffe7e | 2580 | list_add_tail(&req->inflight_entry, &ctx->iopoll_list); |
bdcd3eab | 2581 | |
cb3d8972 PB |
2582 | if (unlikely(in_async)) { |
2583 | /* | |
2584 | * If IORING_SETUP_SQPOLL is enabled, sqes are either handle | |
2585 | * in sq thread task context or in io worker task context. If | |
2586 | * current task context is sq thread, we don't need to check | |
2587 | * whether should wake up sq thread. | |
2588 | */ | |
2589 | if ((ctx->flags & IORING_SETUP_SQPOLL) && | |
2590 | wq_has_sleeper(&ctx->sq_data->wait)) | |
2591 | wake_up(&ctx->sq_data->wait); | |
2592 | ||
2593 | mutex_unlock(&ctx->uring_lock); | |
2594 | } | |
def596e9 JA |
2595 | } |
2596 | ||
9f13c35b PB |
2597 | static inline void io_state_file_put(struct io_submit_state *state) |
2598 | { | |
02b23a9a PB |
2599 | if (state->file_refs) { |
2600 | fput_many(state->file, state->file_refs); | |
2601 | state->file_refs = 0; | |
2602 | } | |
9a56a232 JA |
2603 | } |
2604 | ||
2605 | /* | |
2606 | * Get as many references to a file as we have IOs left in this submission, | |
2607 | * assuming most submissions are for one file, or at least that each file | |
2608 | * has more than one submission. | |
2609 | */ | |
8da11c19 | 2610 | static struct file *__io_file_get(struct io_submit_state *state, int fd) |
9a56a232 JA |
2611 | { |
2612 | if (!state) | |
2613 | return fget(fd); | |
2614 | ||
6e1271e6 | 2615 | if (state->file_refs) { |
9a56a232 | 2616 | if (state->fd == fd) { |
6e1271e6 | 2617 | state->file_refs--; |
9a56a232 JA |
2618 | return state->file; |
2619 | } | |
02b23a9a | 2620 | io_state_file_put(state); |
9a56a232 JA |
2621 | } |
2622 | state->file = fget_many(fd, state->ios_left); | |
6e1271e6 | 2623 | if (unlikely(!state->file)) |
9a56a232 JA |
2624 | return NULL; |
2625 | ||
2626 | state->fd = fd; | |
6e1271e6 | 2627 | state->file_refs = state->ios_left - 1; |
9a56a232 JA |
2628 | return state->file; |
2629 | } | |
2630 | ||
4503b767 JA |
2631 | static bool io_bdev_nowait(struct block_device *bdev) |
2632 | { | |
9ba0d0c8 | 2633 | return !bdev || blk_queue_nowait(bdev_get_queue(bdev)); |
4503b767 JA |
2634 | } |
2635 | ||
2b188cc1 JA |
2636 | /* |
2637 | * If we tracked the file through the SCM inflight mechanism, we could support | |
2638 | * any file. For now, just ensure that anything potentially problematic is done | |
2639 | * inline. | |
2640 | */ | |
b191e2df | 2641 | static bool __io_file_supports_nowait(struct file *file, int rw) |
2b188cc1 JA |
2642 | { |
2643 | umode_t mode = file_inode(file)->i_mode; | |
2644 | ||
4503b767 | 2645 | if (S_ISBLK(mode)) { |
4e7b5671 CH |
2646 | if (IS_ENABLED(CONFIG_BLOCK) && |
2647 | io_bdev_nowait(I_BDEV(file->f_mapping->host))) | |
4503b767 JA |
2648 | return true; |
2649 | return false; | |
2650 | } | |
976517f1 | 2651 | if (S_ISSOCK(mode)) |
2b188cc1 | 2652 | return true; |
4503b767 | 2653 | if (S_ISREG(mode)) { |
4e7b5671 CH |
2654 | if (IS_ENABLED(CONFIG_BLOCK) && |
2655 | io_bdev_nowait(file->f_inode->i_sb->s_bdev) && | |
4503b767 JA |
2656 | file->f_op != &io_uring_fops) |
2657 | return true; | |
2658 | return false; | |
2659 | } | |
2b188cc1 | 2660 | |
c5b85625 JA |
2661 | /* any ->read/write should understand O_NONBLOCK */ |
2662 | if (file->f_flags & O_NONBLOCK) | |
2663 | return true; | |
2664 | ||
af197f50 JA |
2665 | if (!(file->f_mode & FMODE_NOWAIT)) |
2666 | return false; | |
2667 | ||
2668 | if (rw == READ) | |
2669 | return file->f_op->read_iter != NULL; | |
2670 | ||
2671 | return file->f_op->write_iter != NULL; | |
2b188cc1 JA |
2672 | } |
2673 | ||
b191e2df | 2674 | static bool io_file_supports_nowait(struct io_kiocb *req, int rw) |
7b29f92d | 2675 | { |
b191e2df | 2676 | if (rw == READ && (req->flags & REQ_F_NOWAIT_READ)) |
7b29f92d | 2677 | return true; |
b191e2df | 2678 | else if (rw == WRITE && (req->flags & REQ_F_NOWAIT_WRITE)) |
7b29f92d JA |
2679 | return true; |
2680 | ||
b191e2df | 2681 | return __io_file_supports_nowait(req->file, rw); |
7b29f92d JA |
2682 | } |
2683 | ||
a88fc400 | 2684 | static int io_prep_rw(struct io_kiocb *req, const struct io_uring_sqe *sqe) |
2b188cc1 | 2685 | { |
def596e9 | 2686 | struct io_ring_ctx *ctx = req->ctx; |
9adbd45d | 2687 | struct kiocb *kiocb = &req->rw.kiocb; |
75c668cd | 2688 | struct file *file = req->file; |
09bb8394 JA |
2689 | unsigned ioprio; |
2690 | int ret; | |
2b188cc1 | 2691 | |
c97d8a0f | 2692 | if (!io_req_ffs_set(req) && S_ISREG(file_inode(file)->i_mode)) |
491381ce JA |
2693 | req->flags |= REQ_F_ISREG; |
2694 | ||
2b188cc1 | 2695 | kiocb->ki_pos = READ_ONCE(sqe->off); |
75c668cd | 2696 | if (kiocb->ki_pos == -1 && !(file->f_mode & FMODE_STREAM)) { |
ba04291e | 2697 | req->flags |= REQ_F_CUR_POS; |
75c668cd | 2698 | kiocb->ki_pos = file->f_pos; |
ba04291e | 2699 | } |
2b188cc1 | 2700 | kiocb->ki_hint = ki_hint_validate(file_write_hint(kiocb->ki_filp)); |
3e577dcd PB |
2701 | kiocb->ki_flags = iocb_flags(kiocb->ki_filp); |
2702 | ret = kiocb_set_rw_flags(kiocb, READ_ONCE(sqe->rw_flags)); | |
2703 | if (unlikely(ret)) | |
2704 | return ret; | |
2b188cc1 | 2705 | |
75c668cd PB |
2706 | /* don't allow async punt for O_NONBLOCK or RWF_NOWAIT */ |
2707 | if ((kiocb->ki_flags & IOCB_NOWAIT) || (file->f_flags & O_NONBLOCK)) | |
2708 | req->flags |= REQ_F_NOWAIT; | |
2709 | ||
2b188cc1 JA |
2710 | ioprio = READ_ONCE(sqe->ioprio); |
2711 | if (ioprio) { | |
2712 | ret = ioprio_check_cap(ioprio); | |
2713 | if (ret) | |
09bb8394 | 2714 | return ret; |
2b188cc1 JA |
2715 | |
2716 | kiocb->ki_ioprio = ioprio; | |
2717 | } else | |
2718 | kiocb->ki_ioprio = get_current_ioprio(); | |
2719 | ||
def596e9 | 2720 | if (ctx->flags & IORING_SETUP_IOPOLL) { |
def596e9 JA |
2721 | if (!(kiocb->ki_flags & IOCB_DIRECT) || |
2722 | !kiocb->ki_filp->f_op->iopoll) | |
09bb8394 | 2723 | return -EOPNOTSUPP; |
2b188cc1 | 2724 | |
def596e9 JA |
2725 | kiocb->ki_flags |= IOCB_HIPRI; |
2726 | kiocb->ki_complete = io_complete_rw_iopoll; | |
65a6543d | 2727 | req->iopoll_completed = 0; |
def596e9 | 2728 | } else { |
09bb8394 JA |
2729 | if (kiocb->ki_flags & IOCB_HIPRI) |
2730 | return -EINVAL; | |
def596e9 JA |
2731 | kiocb->ki_complete = io_complete_rw; |
2732 | } | |
9adbd45d | 2733 | |
eae071c9 PB |
2734 | if (req->opcode == IORING_OP_READ_FIXED || |
2735 | req->opcode == IORING_OP_WRITE_FIXED) { | |
2736 | req->imu = NULL; | |
2737 | io_req_set_rsrc_node(req); | |
2738 | } | |
2739 | ||
3529d8c2 JA |
2740 | req->rw.addr = READ_ONCE(sqe->addr); |
2741 | req->rw.len = READ_ONCE(sqe->len); | |
4f4eeba8 | 2742 | req->buf_index = READ_ONCE(sqe->buf_index); |
2b188cc1 | 2743 | return 0; |
2b188cc1 JA |
2744 | } |
2745 | ||
2746 | static inline void io_rw_done(struct kiocb *kiocb, ssize_t ret) | |
2747 | { | |
2748 | switch (ret) { | |
2749 | case -EIOCBQUEUED: | |
2750 | break; | |
2751 | case -ERESTARTSYS: | |
2752 | case -ERESTARTNOINTR: | |
2753 | case -ERESTARTNOHAND: | |
2754 | case -ERESTART_RESTARTBLOCK: | |
2755 | /* | |
2756 | * We can't just restart the syscall, since previously | |
2757 | * submitted sqes may already be in progress. Just fail this | |
2758 | * IO with EINTR. | |
2759 | */ | |
2760 | ret = -EINTR; | |
df561f66 | 2761 | fallthrough; |
2b188cc1 JA |
2762 | default: |
2763 | kiocb->ki_complete(kiocb, ret, 0); | |
2764 | } | |
2765 | } | |
2766 | ||
a1d7c393 | 2767 | static void kiocb_done(struct kiocb *kiocb, ssize_t ret, |
889fca73 | 2768 | unsigned int issue_flags) |
ba816ad6 | 2769 | { |
ba04291e | 2770 | struct io_kiocb *req = container_of(kiocb, struct io_kiocb, rw.kiocb); |
e8c2bc1f | 2771 | struct io_async_rw *io = req->async_data; |
97284637 | 2772 | bool check_reissue = kiocb->ki_complete == io_complete_rw; |
ba04291e | 2773 | |
227c0c96 | 2774 | /* add previously done IO, if any */ |
e8c2bc1f | 2775 | if (io && io->bytes_done > 0) { |
227c0c96 | 2776 | if (ret < 0) |
e8c2bc1f | 2777 | ret = io->bytes_done; |
227c0c96 | 2778 | else |
e8c2bc1f | 2779 | ret += io->bytes_done; |
227c0c96 JA |
2780 | } |
2781 | ||
ba04291e JA |
2782 | if (req->flags & REQ_F_CUR_POS) |
2783 | req->file->f_pos = kiocb->ki_pos; | |
e149bd74 | 2784 | if (ret >= 0 && check_reissue) |
889fca73 | 2785 | __io_complete_rw(req, ret, 0, issue_flags); |
ba816ad6 JA |
2786 | else |
2787 | io_rw_done(kiocb, ret); | |
97284637 | 2788 | |
fe7e3257 | 2789 | if (check_reissue && (req->flags & REQ_F_REISSUE)) { |
97284637 | 2790 | req->flags &= ~REQ_F_REISSUE; |
a7be7c23 | 2791 | if (io_resubmit_prep(req)) { |
8c130827 | 2792 | req_ref_get(req); |
773af691 | 2793 | io_req_task_queue_reissue(req); |
8c130827 | 2794 | } else { |
97284637 PB |
2795 | int cflags = 0; |
2796 | ||
93d2bcd2 | 2797 | req_set_fail(req); |
97284637 PB |
2798 | if (req->flags & REQ_F_BUFFER_SELECTED) |
2799 | cflags = io_put_rw_kbuf(req); | |
2800 | __io_req_complete(req, issue_flags, ret, cflags); | |
2801 | } | |
2802 | } | |
ba816ad6 JA |
2803 | } |
2804 | ||
eae071c9 PB |
2805 | static int __io_import_fixed(struct io_kiocb *req, int rw, struct iov_iter *iter, |
2806 | struct io_mapped_ubuf *imu) | |
edafccee | 2807 | { |
9adbd45d | 2808 | size_t len = req->rw.len; |
75769e3f | 2809 | u64 buf_end, buf_addr = req->rw.addr; |
edafccee | 2810 | size_t offset; |
edafccee | 2811 | |
75769e3f | 2812 | if (unlikely(check_add_overflow(buf_addr, (u64)len, &buf_end))) |
edafccee JA |
2813 | return -EFAULT; |
2814 | /* not inside the mapped region */ | |
4751f53d | 2815 | if (unlikely(buf_addr < imu->ubuf || buf_end > imu->ubuf_end)) |
edafccee JA |
2816 | return -EFAULT; |
2817 | ||
2818 | /* | |
2819 | * May not be a start of buffer, set size appropriately | |
2820 | * and advance us to the beginning. | |
2821 | */ | |
2822 | offset = buf_addr - imu->ubuf; | |
2823 | iov_iter_bvec(iter, rw, imu->bvec, imu->nr_bvecs, offset + len); | |
bd11b3a3 JA |
2824 | |
2825 | if (offset) { | |
2826 | /* | |
2827 | * Don't use iov_iter_advance() here, as it's really slow for | |
2828 | * using the latter parts of a big fixed buffer - it iterates | |
2829 | * over each segment manually. We can cheat a bit here, because | |
2830 | * we know that: | |
2831 | * | |
2832 | * 1) it's a BVEC iter, we set it up | |
2833 | * 2) all bvecs are PAGE_SIZE in size, except potentially the | |
2834 | * first and last bvec | |
2835 | * | |
2836 | * So just find our index, and adjust the iterator afterwards. | |
2837 | * If the offset is within the first bvec (or the whole first | |
2838 | * bvec, just use iov_iter_advance(). This makes it easier | |
2839 | * since we can just skip the first segment, which may not | |
2840 | * be PAGE_SIZE aligned. | |
2841 | */ | |
2842 | const struct bio_vec *bvec = imu->bvec; | |
2843 | ||
2844 | if (offset <= bvec->bv_len) { | |
2845 | iov_iter_advance(iter, offset); | |
2846 | } else { | |
2847 | unsigned long seg_skip; | |
2848 | ||
2849 | /* skip first vec */ | |
2850 | offset -= bvec->bv_len; | |
2851 | seg_skip = 1 + (offset >> PAGE_SHIFT); | |
2852 | ||
2853 | iter->bvec = bvec + seg_skip; | |
2854 | iter->nr_segs -= seg_skip; | |
99c79f66 | 2855 | iter->count -= bvec->bv_len + offset; |
bd11b3a3 | 2856 | iter->iov_offset = offset & ~PAGE_MASK; |
bd11b3a3 JA |
2857 | } |
2858 | } | |
2859 | ||
847595de | 2860 | return 0; |
edafccee JA |
2861 | } |
2862 | ||
eae071c9 PB |
2863 | static int io_import_fixed(struct io_kiocb *req, int rw, struct iov_iter *iter) |
2864 | { | |
2865 | struct io_ring_ctx *ctx = req->ctx; | |
2866 | struct io_mapped_ubuf *imu = req->imu; | |
2867 | u16 index, buf_index = req->buf_index; | |
2868 | ||
2869 | if (likely(!imu)) { | |
2870 | if (unlikely(buf_index >= ctx->nr_user_bufs)) | |
2871 | return -EFAULT; | |
2872 | index = array_index_nospec(buf_index, ctx->nr_user_bufs); | |
2873 | imu = READ_ONCE(ctx->user_bufs[index]); | |
2874 | req->imu = imu; | |
2875 | } | |
2876 | return __io_import_fixed(req, rw, iter, imu); | |
2877 | } | |
2878 | ||
bcda7baa JA |
2879 | static void io_ring_submit_unlock(struct io_ring_ctx *ctx, bool needs_lock) |
2880 | { | |
2881 | if (needs_lock) | |
2882 | mutex_unlock(&ctx->uring_lock); | |
2883 | } | |
2884 | ||
2885 | static void io_ring_submit_lock(struct io_ring_ctx *ctx, bool needs_lock) | |
2886 | { | |
2887 | /* | |
2888 | * "Normal" inline submissions always hold the uring_lock, since we | |
2889 | * grab it from the system call. Same is true for the SQPOLL offload. | |
2890 | * The only exception is when we've detached the request and issue it | |
2891 | * from an async worker thread, grab the lock for that case. | |
2892 | */ | |
2893 | if (needs_lock) | |
2894 | mutex_lock(&ctx->uring_lock); | |
2895 | } | |
2896 | ||
2897 | static struct io_buffer *io_buffer_select(struct io_kiocb *req, size_t *len, | |
2898 | int bgid, struct io_buffer *kbuf, | |
2899 | bool needs_lock) | |
2900 | { | |
2901 | struct io_buffer *head; | |
2902 | ||
2903 | if (req->flags & REQ_F_BUFFER_SELECTED) | |
2904 | return kbuf; | |
2905 | ||
2906 | io_ring_submit_lock(req->ctx, needs_lock); | |
2907 | ||
2908 | lockdep_assert_held(&req->ctx->uring_lock); | |
2909 | ||
9e15c3a0 | 2910 | head = xa_load(&req->ctx->io_buffers, bgid); |
bcda7baa JA |
2911 | if (head) { |
2912 | if (!list_empty(&head->list)) { | |
2913 | kbuf = list_last_entry(&head->list, struct io_buffer, | |
2914 | list); | |
2915 | list_del(&kbuf->list); | |
2916 | } else { | |
2917 | kbuf = head; | |
9e15c3a0 | 2918 | xa_erase(&req->ctx->io_buffers, bgid); |
bcda7baa JA |
2919 | } |
2920 | if (*len > kbuf->len) | |
2921 | *len = kbuf->len; | |
2922 | } else { | |
2923 | kbuf = ERR_PTR(-ENOBUFS); | |
2924 | } | |
2925 | ||
2926 | io_ring_submit_unlock(req->ctx, needs_lock); | |
2927 | ||
2928 | return kbuf; | |
2929 | } | |
2930 | ||
4d954c25 JA |
2931 | static void __user *io_rw_buffer_select(struct io_kiocb *req, size_t *len, |
2932 | bool needs_lock) | |
2933 | { | |
2934 | struct io_buffer *kbuf; | |
4f4eeba8 | 2935 | u16 bgid; |
4d954c25 JA |
2936 | |
2937 | kbuf = (struct io_buffer *) (unsigned long) req->rw.addr; | |
4f4eeba8 | 2938 | bgid = req->buf_index; |
4d954c25 JA |
2939 | kbuf = io_buffer_select(req, len, bgid, kbuf, needs_lock); |
2940 | if (IS_ERR(kbuf)) | |
2941 | return kbuf; | |
2942 | req->rw.addr = (u64) (unsigned long) kbuf; | |
2943 | req->flags |= REQ_F_BUFFER_SELECTED; | |
2944 | return u64_to_user_ptr(kbuf->addr); | |
2945 | } | |
2946 | ||
2947 | #ifdef CONFIG_COMPAT | |
2948 | static ssize_t io_compat_import(struct io_kiocb *req, struct iovec *iov, | |
2949 | bool needs_lock) | |
2950 | { | |
2951 | struct compat_iovec __user *uiov; | |
2952 | compat_ssize_t clen; | |
2953 | void __user *buf; | |
2954 | ssize_t len; | |
2955 | ||
2956 | uiov = u64_to_user_ptr(req->rw.addr); | |
2957 | if (!access_ok(uiov, sizeof(*uiov))) | |
2958 | return -EFAULT; | |
2959 | if (__get_user(clen, &uiov->iov_len)) | |
2960 | return -EFAULT; | |
2961 | if (clen < 0) | |
2962 | return -EINVAL; | |
2963 | ||
2964 | len = clen; | |
2965 | buf = io_rw_buffer_select(req, &len, needs_lock); | |
2966 | if (IS_ERR(buf)) | |
2967 | return PTR_ERR(buf); | |
2968 | iov[0].iov_base = buf; | |
2969 | iov[0].iov_len = (compat_size_t) len; | |
2970 | return 0; | |
2971 | } | |
2972 | #endif | |
2973 | ||
2974 | static ssize_t __io_iov_buffer_select(struct io_kiocb *req, struct iovec *iov, | |
2975 | bool needs_lock) | |
2976 | { | |
2977 | struct iovec __user *uiov = u64_to_user_ptr(req->rw.addr); | |
2978 | void __user *buf; | |
2979 | ssize_t len; | |
2980 | ||
2981 | if (copy_from_user(iov, uiov, sizeof(*uiov))) | |
2982 | return -EFAULT; | |
2983 | ||
2984 | len = iov[0].iov_len; | |
2985 | if (len < 0) | |
2986 | return -EINVAL; | |
2987 | buf = io_rw_buffer_select(req, &len, needs_lock); | |
2988 | if (IS_ERR(buf)) | |
2989 | return PTR_ERR(buf); | |
2990 | iov[0].iov_base = buf; | |
2991 | iov[0].iov_len = len; | |
2992 | return 0; | |
2993 | } | |
2994 | ||
2995 | static ssize_t io_iov_buffer_select(struct io_kiocb *req, struct iovec *iov, | |
2996 | bool needs_lock) | |
2997 | { | |
dddb3e26 JA |
2998 | if (req->flags & REQ_F_BUFFER_SELECTED) { |
2999 | struct io_buffer *kbuf; | |
3000 | ||
3001 | kbuf = (struct io_buffer *) (unsigned long) req->rw.addr; | |
3002 | iov[0].iov_base = u64_to_user_ptr(kbuf->addr); | |
3003 | iov[0].iov_len = kbuf->len; | |
4d954c25 | 3004 | return 0; |
dddb3e26 | 3005 | } |
dd201662 | 3006 | if (req->rw.len != 1) |
4d954c25 JA |
3007 | return -EINVAL; |
3008 | ||
3009 | #ifdef CONFIG_COMPAT | |
3010 | if (req->ctx->compat) | |
3011 | return io_compat_import(req, iov, needs_lock); | |
3012 | #endif | |
3013 | ||
3014 | return __io_iov_buffer_select(req, iov, needs_lock); | |
3015 | } | |
3016 | ||
847595de PB |
3017 | static int io_import_iovec(int rw, struct io_kiocb *req, struct iovec **iovec, |
3018 | struct iov_iter *iter, bool needs_lock) | |
2b188cc1 | 3019 | { |
9adbd45d JA |
3020 | void __user *buf = u64_to_user_ptr(req->rw.addr); |
3021 | size_t sqe_len = req->rw.len; | |
847595de | 3022 | u8 opcode = req->opcode; |
4d954c25 | 3023 | ssize_t ret; |
edafccee | 3024 | |
7d009165 | 3025 | if (opcode == IORING_OP_READ_FIXED || opcode == IORING_OP_WRITE_FIXED) { |
edafccee | 3026 | *iovec = NULL; |
9adbd45d | 3027 | return io_import_fixed(req, rw, iter); |
edafccee | 3028 | } |
2b188cc1 | 3029 | |
bcda7baa | 3030 | /* buffer index only valid with fixed read/write, or buffer select */ |
4f4eeba8 | 3031 | if (req->buf_index && !(req->flags & REQ_F_BUFFER_SELECT)) |
9adbd45d JA |
3032 | return -EINVAL; |
3033 | ||
3a6820f2 | 3034 | if (opcode == IORING_OP_READ || opcode == IORING_OP_WRITE) { |
bcda7baa | 3035 | if (req->flags & REQ_F_BUFFER_SELECT) { |
4d954c25 | 3036 | buf = io_rw_buffer_select(req, &sqe_len, needs_lock); |
867a23ea | 3037 | if (IS_ERR(buf)) |
4d954c25 | 3038 | return PTR_ERR(buf); |
3f9d6441 | 3039 | req->rw.len = sqe_len; |
bcda7baa JA |
3040 | } |
3041 | ||
3a6820f2 JA |
3042 | ret = import_single_range(rw, buf, sqe_len, *iovec, iter); |
3043 | *iovec = NULL; | |
10fc72e4 | 3044 | return ret; |
3a6820f2 JA |
3045 | } |
3046 | ||
4d954c25 JA |
3047 | if (req->flags & REQ_F_BUFFER_SELECT) { |
3048 | ret = io_iov_buffer_select(req, *iovec, needs_lock); | |
847595de PB |
3049 | if (!ret) |
3050 | iov_iter_init(iter, rw, *iovec, 1, (*iovec)->iov_len); | |
4d954c25 JA |
3051 | *iovec = NULL; |
3052 | return ret; | |
3053 | } | |
3054 | ||
89cd35c5 CH |
3055 | return __import_iovec(rw, buf, sqe_len, UIO_FASTIOV, iovec, iter, |
3056 | req->ctx->compat); | |
2b188cc1 JA |
3057 | } |
3058 | ||
0fef9483 JA |
3059 | static inline loff_t *io_kiocb_ppos(struct kiocb *kiocb) |
3060 | { | |
5b09e37e | 3061 | return (kiocb->ki_filp->f_mode & FMODE_STREAM) ? NULL : &kiocb->ki_pos; |
0fef9483 JA |
3062 | } |
3063 | ||
31b51510 | 3064 | /* |
32960613 JA |
3065 | * For files that don't have ->read_iter() and ->write_iter(), handle them |
3066 | * by looping over ->read() or ->write() manually. | |
31b51510 | 3067 | */ |
4017eb91 | 3068 | static ssize_t loop_rw_iter(int rw, struct io_kiocb *req, struct iov_iter *iter) |
32960613 | 3069 | { |
4017eb91 JA |
3070 | struct kiocb *kiocb = &req->rw.kiocb; |
3071 | struct file *file = req->file; | |
32960613 JA |
3072 | ssize_t ret = 0; |
3073 | ||
3074 | /* | |
3075 | * Don't support polled IO through this interface, and we can't | |
3076 | * support non-blocking either. For the latter, this just causes | |
3077 | * the kiocb to be handled from an async context. | |
3078 | */ | |
3079 | if (kiocb->ki_flags & IOCB_HIPRI) | |
3080 | return -EOPNOTSUPP; | |
3081 | if (kiocb->ki_flags & IOCB_NOWAIT) | |
3082 | return -EAGAIN; | |
3083 | ||
3084 | while (iov_iter_count(iter)) { | |
311ae9e1 | 3085 | struct iovec iovec; |
32960613 JA |
3086 | ssize_t nr; |
3087 | ||
311ae9e1 PB |
3088 | if (!iov_iter_is_bvec(iter)) { |
3089 | iovec = iov_iter_iovec(iter); | |
3090 | } else { | |
4017eb91 JA |
3091 | iovec.iov_base = u64_to_user_ptr(req->rw.addr); |
3092 | iovec.iov_len = req->rw.len; | |
311ae9e1 PB |
3093 | } |
3094 | ||
32960613 JA |
3095 | if (rw == READ) { |
3096 | nr = file->f_op->read(file, iovec.iov_base, | |
0fef9483 | 3097 | iovec.iov_len, io_kiocb_ppos(kiocb)); |
32960613 JA |
3098 | } else { |
3099 | nr = file->f_op->write(file, iovec.iov_base, | |
0fef9483 | 3100 | iovec.iov_len, io_kiocb_ppos(kiocb)); |
32960613 JA |
3101 | } |
3102 | ||
3103 | if (nr < 0) { | |
3104 | if (!ret) | |
3105 | ret = nr; | |
3106 | break; | |
3107 | } | |
3108 | ret += nr; | |
3109 | if (nr != iovec.iov_len) | |
3110 | break; | |
4017eb91 JA |
3111 | req->rw.len -= nr; |
3112 | req->rw.addr += nr; | |
32960613 JA |
3113 | iov_iter_advance(iter, nr); |
3114 | } | |
3115 | ||
3116 | return ret; | |
3117 | } | |
3118 | ||
ff6165b2 JA |
3119 | static void io_req_map_rw(struct io_kiocb *req, const struct iovec *iovec, |
3120 | const struct iovec *fast_iov, struct iov_iter *iter) | |
f67676d1 | 3121 | { |
e8c2bc1f | 3122 | struct io_async_rw *rw = req->async_data; |
b64e3444 | 3123 | |
ff6165b2 | 3124 | memcpy(&rw->iter, iter, sizeof(*iter)); |
afb87658 | 3125 | rw->free_iovec = iovec; |
227c0c96 | 3126 | rw->bytes_done = 0; |
ff6165b2 | 3127 | /* can only be fixed buffers, no need to do anything */ |
9c3a205c | 3128 | if (iov_iter_is_bvec(iter)) |
ff6165b2 | 3129 | return; |
b64e3444 | 3130 | if (!iovec) { |
ff6165b2 JA |
3131 | unsigned iov_off = 0; |
3132 | ||
3133 | rw->iter.iov = rw->fast_iov; | |
3134 | if (iter->iov != fast_iov) { | |
3135 | iov_off = iter->iov - fast_iov; | |
3136 | rw->iter.iov += iov_off; | |
3137 | } | |
3138 | if (rw->fast_iov != fast_iov) | |
3139 | memcpy(rw->fast_iov + iov_off, fast_iov + iov_off, | |
45097dae | 3140 | sizeof(struct iovec) * iter->nr_segs); |
99bc4c38 PB |
3141 | } else { |
3142 | req->flags |= REQ_F_NEED_CLEANUP; | |
f67676d1 JA |
3143 | } |
3144 | } | |
3145 | ||
6cb78689 | 3146 | static inline int io_alloc_async_data(struct io_kiocb *req) |
3d9932a8 | 3147 | { |
e8c2bc1f JA |
3148 | WARN_ON_ONCE(!io_op_defs[req->opcode].async_size); |
3149 | req->async_data = kmalloc(io_op_defs[req->opcode].async_size, GFP_KERNEL); | |
3150 | return req->async_data == NULL; | |
3d9932a8 XW |
3151 | } |
3152 | ||
ff6165b2 JA |
3153 | static int io_setup_async_rw(struct io_kiocb *req, const struct iovec *iovec, |
3154 | const struct iovec *fast_iov, | |
227c0c96 | 3155 | struct iov_iter *iter, bool force) |
b7bb4f7d | 3156 | { |
26f0505a | 3157 | if (!force && !io_op_defs[req->opcode].needs_async_setup) |
74566df3 | 3158 | return 0; |
e8c2bc1f | 3159 | if (!req->async_data) { |
6cb78689 | 3160 | if (io_alloc_async_data(req)) { |
6bf985dc | 3161 | kfree(iovec); |
5d204bcf | 3162 | return -ENOMEM; |
6bf985dc | 3163 | } |
b7bb4f7d | 3164 | |
ff6165b2 | 3165 | io_req_map_rw(req, iovec, fast_iov, iter); |
5d204bcf | 3166 | } |
b7bb4f7d | 3167 | return 0; |
f67676d1 JA |
3168 | } |
3169 | ||
73debe68 | 3170 | static inline int io_rw_prep_async(struct io_kiocb *req, int rw) |
c3e330a4 | 3171 | { |
e8c2bc1f | 3172 | struct io_async_rw *iorw = req->async_data; |
f4bff104 | 3173 | struct iovec *iov = iorw->fast_iov; |
847595de | 3174 | int ret; |
c3e330a4 | 3175 | |
2846c481 | 3176 | ret = io_import_iovec(rw, req, &iov, &iorw->iter, false); |
c3e330a4 PB |
3177 | if (unlikely(ret < 0)) |
3178 | return ret; | |
3179 | ||
ab0b196c PB |
3180 | iorw->bytes_done = 0; |
3181 | iorw->free_iovec = iov; | |
3182 | if (iov) | |
3183 | req->flags |= REQ_F_NEED_CLEANUP; | |
c3e330a4 PB |
3184 | return 0; |
3185 | } | |
3186 | ||
73debe68 | 3187 | static int io_read_prep(struct io_kiocb *req, const struct io_uring_sqe *sqe) |
f67676d1 | 3188 | { |
3529d8c2 JA |
3189 | if (unlikely(!(req->file->f_mode & FMODE_READ))) |
3190 | return -EBADF; | |
93642ef8 | 3191 | return io_prep_rw(req, sqe); |
f67676d1 JA |
3192 | } |
3193 | ||
c1dd91d1 JA |
3194 | /* |
3195 | * This is our waitqueue callback handler, registered through lock_page_async() | |
3196 | * when we initially tried to do the IO with the iocb armed our waitqueue. | |
3197 | * This gets called when the page is unlocked, and we generally expect that to | |
3198 | * happen when the page IO is completed and the page is now uptodate. This will | |
3199 | * queue a task_work based retry of the operation, attempting to copy the data | |
3200 | * again. If the latter fails because the page was NOT uptodate, then we will | |
3201 | * do a thread based blocking retry of the operation. That's the unexpected | |
3202 | * slow path. | |
3203 | */ | |
bcf5a063 JA |
3204 | static int io_async_buf_func(struct wait_queue_entry *wait, unsigned mode, |
3205 | int sync, void *arg) | |
3206 | { | |
3207 | struct wait_page_queue *wpq; | |
3208 | struct io_kiocb *req = wait->private; | |
bcf5a063 | 3209 | struct wait_page_key *key = arg; |
bcf5a063 JA |
3210 | |
3211 | wpq = container_of(wait, struct wait_page_queue, wait); | |
3212 | ||
cdc8fcb4 LT |
3213 | if (!wake_page_match(wpq, key)) |
3214 | return 0; | |
3215 | ||
c8d317aa | 3216 | req->rw.kiocb.ki_flags &= ~IOCB_WAITQ; |
bcf5a063 JA |
3217 | list_del_init(&wait->entry); |
3218 | ||
bcf5a063 | 3219 | /* submit ref gets dropped, acquire a new one */ |
de9b4cca | 3220 | req_ref_get(req); |
921b9054 | 3221 | io_req_task_queue(req); |
bcf5a063 JA |
3222 | return 1; |
3223 | } | |
3224 | ||
c1dd91d1 JA |
3225 | /* |
3226 | * This controls whether a given IO request should be armed for async page | |
3227 | * based retry. If we return false here, the request is handed to the async | |
3228 | * worker threads for retry. If we're doing buffered reads on a regular file, | |
3229 | * we prepare a private wait_page_queue entry and retry the operation. This | |
3230 | * will either succeed because the page is now uptodate and unlocked, or it | |
3231 | * will register a callback when the page is unlocked at IO completion. Through | |
3232 | * that callback, io_uring uses task_work to setup a retry of the operation. | |
3233 | * That retry will attempt the buffered read again. The retry will generally | |
3234 | * succeed, or in rare cases where it fails, we then fall back to using the | |
3235 | * async worker threads for a blocking retry. | |
3236 | */ | |
227c0c96 | 3237 | static bool io_rw_should_retry(struct io_kiocb *req) |
f67676d1 | 3238 | { |
e8c2bc1f JA |
3239 | struct io_async_rw *rw = req->async_data; |
3240 | struct wait_page_queue *wait = &rw->wpq; | |
bcf5a063 | 3241 | struct kiocb *kiocb = &req->rw.kiocb; |
f67676d1 | 3242 | |
bcf5a063 JA |
3243 | /* never retry for NOWAIT, we just complete with -EAGAIN */ |
3244 | if (req->flags & REQ_F_NOWAIT) | |
3245 | return false; | |
f67676d1 | 3246 | |
227c0c96 | 3247 | /* Only for buffered IO */ |
3b2a4439 | 3248 | if (kiocb->ki_flags & (IOCB_DIRECT | IOCB_HIPRI)) |
bcf5a063 | 3249 | return false; |
3b2a4439 | 3250 | |
bcf5a063 JA |
3251 | /* |
3252 | * just use poll if we can, and don't attempt if the fs doesn't | |
3253 | * support callback based unlocks | |
3254 | */ | |
3255 | if (file_can_poll(req->file) || !(req->file->f_mode & FMODE_BUF_RASYNC)) | |
3256 | return false; | |
f67676d1 | 3257 | |
3b2a4439 JA |
3258 | wait->wait.func = io_async_buf_func; |
3259 | wait->wait.private = req; | |
3260 | wait->wait.flags = 0; | |
3261 | INIT_LIST_HEAD(&wait->wait.entry); | |
3262 | kiocb->ki_flags |= IOCB_WAITQ; | |
c8d317aa | 3263 | kiocb->ki_flags &= ~IOCB_NOWAIT; |
3b2a4439 | 3264 | kiocb->ki_waitq = wait; |
3b2a4439 | 3265 | return true; |
bcf5a063 JA |
3266 | } |
3267 | ||
aeab9506 | 3268 | static inline int io_iter_do_read(struct io_kiocb *req, struct iov_iter *iter) |
bcf5a063 JA |
3269 | { |
3270 | if (req->file->f_op->read_iter) | |
3271 | return call_read_iter(req->file, &req->rw.kiocb, iter); | |
2dd2111d | 3272 | else if (req->file->f_op->read) |
4017eb91 | 3273 | return loop_rw_iter(READ, req, iter); |
2dd2111d GH |
3274 | else |
3275 | return -EINVAL; | |
f67676d1 JA |
3276 | } |
3277 | ||
889fca73 | 3278 | static int io_read(struct io_kiocb *req, unsigned int issue_flags) |
2b188cc1 JA |
3279 | { |
3280 | struct iovec inline_vecs[UIO_FASTIOV], *iovec = inline_vecs; | |
9adbd45d | 3281 | struct kiocb *kiocb = &req->rw.kiocb; |
ff6165b2 | 3282 | struct iov_iter __iter, *iter = &__iter; |
e8c2bc1f | 3283 | struct io_async_rw *rw = req->async_data; |
227c0c96 | 3284 | ssize_t io_size, ret, ret2; |
45d189c6 | 3285 | bool force_nonblock = issue_flags & IO_URING_F_NONBLOCK; |
ff6165b2 | 3286 | |
2846c481 | 3287 | if (rw) { |
e8c2bc1f | 3288 | iter = &rw->iter; |
2846c481 PB |
3289 | iovec = NULL; |
3290 | } else { | |
3291 | ret = io_import_iovec(READ, req, &iovec, iter, !force_nonblock); | |
3292 | if (ret < 0) | |
3293 | return ret; | |
3294 | } | |
632546c4 | 3295 | io_size = iov_iter_count(iter); |
fa15bafb | 3296 | req->result = io_size; |
2b188cc1 | 3297 | |
fd6c2e4c JA |
3298 | /* Ensure we clear previously set non-block flag */ |
3299 | if (!force_nonblock) | |
29de5f6a | 3300 | kiocb->ki_flags &= ~IOCB_NOWAIT; |
a88fc400 PB |
3301 | else |
3302 | kiocb->ki_flags |= IOCB_NOWAIT; | |
3303 | ||
24c74678 | 3304 | /* If the file doesn't support async, just async punt */ |
b191e2df | 3305 | if (force_nonblock && !io_file_supports_nowait(req, READ)) { |
6713e7a6 | 3306 | ret = io_setup_async_rw(req, iovec, inline_vecs, iter, true); |
6bf985dc | 3307 | return ret ?: -EAGAIN; |
6713e7a6 | 3308 | } |
9e645e11 | 3309 | |
632546c4 | 3310 | ret = rw_verify_area(READ, req->file, io_kiocb_ppos(kiocb), io_size); |
5ea5dd45 PB |
3311 | if (unlikely(ret)) { |
3312 | kfree(iovec); | |
3313 | return ret; | |
3314 | } | |
2b188cc1 | 3315 | |
227c0c96 | 3316 | ret = io_iter_do_read(req, iter); |
32960613 | 3317 | |
230d50d4 | 3318 | if (ret == -EAGAIN || (req->flags & REQ_F_REISSUE)) { |
6ad7f233 | 3319 | req->flags &= ~REQ_F_REISSUE; |
eefdf30f JA |
3320 | /* IOPOLL retry should happen for io-wq threads */ |
3321 | if (!force_nonblock && !(req->ctx->flags & IORING_SETUP_IOPOLL)) | |
f91daf56 | 3322 | goto done; |
75c668cd PB |
3323 | /* no retry on NONBLOCK nor RWF_NOWAIT */ |
3324 | if (req->flags & REQ_F_NOWAIT) | |
355afaeb | 3325 | goto done; |
84216315 | 3326 | /* some cases will consume bytes even on error returns */ |
632546c4 | 3327 | iov_iter_revert(iter, io_size - iov_iter_count(iter)); |
f38c7e3a | 3328 | ret = 0; |
230d50d4 JA |
3329 | } else if (ret == -EIOCBQUEUED) { |
3330 | goto out_free; | |
7335e3bf | 3331 | } else if (ret <= 0 || ret == io_size || !force_nonblock || |
75c668cd | 3332 | (req->flags & REQ_F_NOWAIT) || !(req->flags & REQ_F_ISREG)) { |
7335e3bf | 3333 | /* read all, failed, already did sync or don't want to retry */ |
00d23d51 | 3334 | goto done; |
227c0c96 JA |
3335 | } |
3336 | ||
227c0c96 | 3337 | ret2 = io_setup_async_rw(req, iovec, inline_vecs, iter, true); |
6bf985dc PB |
3338 | if (ret2) |
3339 | return ret2; | |
3340 | ||
fe1cdd55 | 3341 | iovec = NULL; |
e8c2bc1f | 3342 | rw = req->async_data; |
227c0c96 | 3343 | /* now use our persistent iterator, if we aren't already */ |
e8c2bc1f | 3344 | iter = &rw->iter; |
227c0c96 | 3345 | |
b23df91b PB |
3346 | do { |
3347 | io_size -= ret; | |
3348 | rw->bytes_done += ret; | |
3349 | /* if we can retry, do so with the callbacks armed */ | |
3350 | if (!io_rw_should_retry(req)) { | |
3351 | kiocb->ki_flags &= ~IOCB_WAITQ; | |
3352 | return -EAGAIN; | |
3353 | } | |
3354 | ||
3355 | /* | |
3356 | * Now retry read with the IOCB_WAITQ parts set in the iocb. If | |
3357 | * we get -EIOCBQUEUED, then we'll get a notification when the | |
3358 | * desired page gets unlocked. We can also get a partial read | |
3359 | * here, and if we do, then just retry at the new offset. | |
3360 | */ | |
3361 | ret = io_iter_do_read(req, iter); | |
3362 | if (ret == -EIOCBQUEUED) | |
3363 | return 0; | |
227c0c96 | 3364 | /* we got some bytes, but not all. retry. */ |
b5b0ecb7 | 3365 | kiocb->ki_flags &= ~IOCB_WAITQ; |
b23df91b | 3366 | } while (ret > 0 && ret < io_size); |
227c0c96 | 3367 | done: |
889fca73 | 3368 | kiocb_done(kiocb, ret, issue_flags); |
fe1cdd55 PB |
3369 | out_free: |
3370 | /* it's faster to check here then delegate to kfree */ | |
3371 | if (iovec) | |
3372 | kfree(iovec); | |
5ea5dd45 | 3373 | return 0; |
2b188cc1 JA |
3374 | } |
3375 | ||
73debe68 | 3376 | static int io_write_prep(struct io_kiocb *req, const struct io_uring_sqe *sqe) |
f67676d1 | 3377 | { |
3529d8c2 JA |
3378 | if (unlikely(!(req->file->f_mode & FMODE_WRITE))) |
3379 | return -EBADF; | |
93642ef8 | 3380 | return io_prep_rw(req, sqe); |
f67676d1 JA |
3381 | } |
3382 | ||
889fca73 | 3383 | static int io_write(struct io_kiocb *req, unsigned int issue_flags) |
2b188cc1 JA |
3384 | { |
3385 | struct iovec inline_vecs[UIO_FASTIOV], *iovec = inline_vecs; | |
9adbd45d | 3386 | struct kiocb *kiocb = &req->rw.kiocb; |
ff6165b2 | 3387 | struct iov_iter __iter, *iter = &__iter; |
e8c2bc1f | 3388 | struct io_async_rw *rw = req->async_data; |
fa15bafb | 3389 | ssize_t ret, ret2, io_size; |
45d189c6 | 3390 | bool force_nonblock = issue_flags & IO_URING_F_NONBLOCK; |
2b188cc1 | 3391 | |
2846c481 | 3392 | if (rw) { |
e8c2bc1f | 3393 | iter = &rw->iter; |
2846c481 PB |
3394 | iovec = NULL; |
3395 | } else { | |
3396 | ret = io_import_iovec(WRITE, req, &iovec, iter, !force_nonblock); | |
3397 | if (ret < 0) | |
3398 | return ret; | |
3399 | } | |
632546c4 | 3400 | io_size = iov_iter_count(iter); |
fa15bafb | 3401 | req->result = io_size; |
2b188cc1 | 3402 | |
fd6c2e4c JA |
3403 | /* Ensure we clear previously set non-block flag */ |
3404 | if (!force_nonblock) | |
a88fc400 PB |
3405 | kiocb->ki_flags &= ~IOCB_NOWAIT; |
3406 | else | |
3407 | kiocb->ki_flags |= IOCB_NOWAIT; | |
fd6c2e4c | 3408 | |
24c74678 | 3409 | /* If the file doesn't support async, just async punt */ |
b191e2df | 3410 | if (force_nonblock && !io_file_supports_nowait(req, WRITE)) |
f67676d1 | 3411 | goto copy_iov; |
31b51510 | 3412 | |
10d59345 JA |
3413 | /* file path doesn't support NOWAIT for non-direct_IO */ |
3414 | if (force_nonblock && !(kiocb->ki_flags & IOCB_DIRECT) && | |
3415 | (req->flags & REQ_F_ISREG)) | |
f67676d1 | 3416 | goto copy_iov; |
31b51510 | 3417 | |
632546c4 | 3418 | ret = rw_verify_area(WRITE, req->file, io_kiocb_ppos(kiocb), io_size); |
fa15bafb PB |
3419 | if (unlikely(ret)) |
3420 | goto out_free; | |
4ed734b0 | 3421 | |
fa15bafb PB |
3422 | /* |
3423 | * Open-code file_start_write here to grab freeze protection, | |
3424 | * which will be released by another thread in | |
3425 | * io_complete_rw(). Fool lockdep by telling it the lock got | |
3426 | * released so that it doesn't complain about the held lock when | |
3427 | * we return to userspace. | |
3428 | */ | |
3429 | if (req->flags & REQ_F_ISREG) { | |
8a3c84b6 | 3430 | sb_start_write(file_inode(req->file)->i_sb); |
fa15bafb PB |
3431 | __sb_writers_release(file_inode(req->file)->i_sb, |
3432 | SB_FREEZE_WRITE); | |
3433 | } | |
3434 | kiocb->ki_flags |= IOCB_WRITE; | |
4ed734b0 | 3435 | |
fa15bafb | 3436 | if (req->file->f_op->write_iter) |
ff6165b2 | 3437 | ret2 = call_write_iter(req->file, kiocb, iter); |
2dd2111d | 3438 | else if (req->file->f_op->write) |
4017eb91 | 3439 | ret2 = loop_rw_iter(WRITE, req, iter); |
2dd2111d GH |
3440 | else |
3441 | ret2 = -EINVAL; | |
4ed734b0 | 3442 | |
6ad7f233 PB |
3443 | if (req->flags & REQ_F_REISSUE) { |
3444 | req->flags &= ~REQ_F_REISSUE; | |
230d50d4 | 3445 | ret2 = -EAGAIN; |
6ad7f233 | 3446 | } |
230d50d4 | 3447 | |
fa15bafb PB |
3448 | /* |
3449 | * Raw bdev writes will return -EOPNOTSUPP for IOCB_NOWAIT. Just | |
3450 | * retry them without IOCB_NOWAIT. | |
3451 | */ | |
3452 | if (ret2 == -EOPNOTSUPP && (kiocb->ki_flags & IOCB_NOWAIT)) | |
3453 | ret2 = -EAGAIN; | |
75c668cd PB |
3454 | /* no retry on NONBLOCK nor RWF_NOWAIT */ |
3455 | if (ret2 == -EAGAIN && (req->flags & REQ_F_NOWAIT)) | |
355afaeb | 3456 | goto done; |
fa15bafb | 3457 | if (!force_nonblock || ret2 != -EAGAIN) { |
eefdf30f JA |
3458 | /* IOPOLL retry should happen for io-wq threads */ |
3459 | if ((req->ctx->flags & IORING_SETUP_IOPOLL) && ret2 == -EAGAIN) | |
3460 | goto copy_iov; | |
355afaeb | 3461 | done: |
889fca73 | 3462 | kiocb_done(kiocb, ret2, issue_flags); |
fa15bafb | 3463 | } else { |
f67676d1 | 3464 | copy_iov: |
84216315 | 3465 | /* some cases will consume bytes even on error returns */ |
632546c4 | 3466 | iov_iter_revert(iter, io_size - iov_iter_count(iter)); |
227c0c96 | 3467 | ret = io_setup_async_rw(req, iovec, inline_vecs, iter, false); |
6bf985dc | 3468 | return ret ?: -EAGAIN; |
2b188cc1 | 3469 | } |
31b51510 | 3470 | out_free: |
f261c168 | 3471 | /* it's reportedly faster than delegating the null check to kfree() */ |
252917c3 | 3472 | if (iovec) |
6f2cc166 | 3473 | kfree(iovec); |
2b188cc1 JA |
3474 | return ret; |
3475 | } | |
3476 | ||
80a261fd JA |
3477 | static int io_renameat_prep(struct io_kiocb *req, |
3478 | const struct io_uring_sqe *sqe) | |
3479 | { | |
3480 | struct io_rename *ren = &req->rename; | |
3481 | const char __user *oldf, *newf; | |
3482 | ||
ed7eb259 JA |
3483 | if (unlikely(req->ctx->flags & IORING_SETUP_IOPOLL)) |
3484 | return -EINVAL; | |
3485 | if (sqe->ioprio || sqe->buf_index) | |
3486 | return -EINVAL; | |
80a261fd JA |
3487 | if (unlikely(req->flags & REQ_F_FIXED_FILE)) |
3488 | return -EBADF; | |
3489 | ||
3490 | ren->old_dfd = READ_ONCE(sqe->fd); | |
3491 | oldf = u64_to_user_ptr(READ_ONCE(sqe->addr)); | |
3492 | newf = u64_to_user_ptr(READ_ONCE(sqe->addr2)); | |
3493 | ren->new_dfd = READ_ONCE(sqe->len); | |
3494 | ren->flags = READ_ONCE(sqe->rename_flags); | |
3495 | ||
3496 | ren->oldpath = getname(oldf); | |
3497 | if (IS_ERR(ren->oldpath)) | |
3498 | return PTR_ERR(ren->oldpath); | |
3499 | ||
3500 | ren->newpath = getname(newf); | |
3501 | if (IS_ERR(ren->newpath)) { | |
3502 | putname(ren->oldpath); | |
3503 | return PTR_ERR(ren->newpath); | |
3504 | } | |
3505 | ||
3506 | req->flags |= REQ_F_NEED_CLEANUP; | |
3507 | return 0; | |
3508 | } | |
3509 | ||
45d189c6 | 3510 | static int io_renameat(struct io_kiocb *req, unsigned int issue_flags) |
80a261fd JA |
3511 | { |
3512 | struct io_rename *ren = &req->rename; | |
3513 | int ret; | |
3514 | ||
45d189c6 | 3515 | if (issue_flags & IO_URING_F_NONBLOCK) |
80a261fd JA |
3516 | return -EAGAIN; |
3517 | ||
3518 | ret = do_renameat2(ren->old_dfd, ren->oldpath, ren->new_dfd, | |
3519 | ren->newpath, ren->flags); | |
3520 | ||
3521 | req->flags &= ~REQ_F_NEED_CLEANUP; | |
3522 | if (ret < 0) | |
93d2bcd2 | 3523 | req_set_fail(req); |
80a261fd JA |
3524 | io_req_complete(req, ret); |
3525 | return 0; | |
3526 | } | |
3527 | ||
14a1143b JA |
3528 | static int io_unlinkat_prep(struct io_kiocb *req, |
3529 | const struct io_uring_sqe *sqe) | |
3530 | { | |
3531 | struct io_unlink *un = &req->unlink; | |
3532 | const char __user *fname; | |
3533 | ||
22634bc5 JA |
3534 | if (unlikely(req->ctx->flags & IORING_SETUP_IOPOLL)) |
3535 | return -EINVAL; | |
3536 | if (sqe->ioprio || sqe->off || sqe->len || sqe->buf_index) | |
3537 | return -EINVAL; | |
14a1143b JA |
3538 | if (unlikely(req->flags & REQ_F_FIXED_FILE)) |
3539 | return -EBADF; | |
3540 | ||
3541 | un->dfd = READ_ONCE(sqe->fd); | |
3542 | ||
3543 | un->flags = READ_ONCE(sqe->unlink_flags); | |
3544 | if (un->flags & ~AT_REMOVEDIR) | |
3545 | return -EINVAL; | |
3546 | ||
3547 | fname = u64_to_user_ptr(READ_ONCE(sqe->addr)); | |
3548 | un->filename = getname(fname); | |
3549 | if (IS_ERR(un->filename)) | |
3550 | return PTR_ERR(un->filename); | |
3551 | ||
3552 | req->flags |= REQ_F_NEED_CLEANUP; | |
3553 | return 0; | |
3554 | } | |
3555 | ||
45d189c6 | 3556 | static int io_unlinkat(struct io_kiocb *req, unsigned int issue_flags) |
14a1143b JA |
3557 | { |
3558 | struct io_unlink *un = &req->unlink; | |
3559 | int ret; | |
3560 | ||
45d189c6 | 3561 | if (issue_flags & IO_URING_F_NONBLOCK) |
14a1143b JA |
3562 | return -EAGAIN; |
3563 | ||
3564 | if (un->flags & AT_REMOVEDIR) | |
3565 | ret = do_rmdir(un->dfd, un->filename); | |
3566 | else | |
3567 | ret = do_unlinkat(un->dfd, un->filename); | |
3568 | ||
3569 | req->flags &= ~REQ_F_NEED_CLEANUP; | |
3570 | if (ret < 0) | |
93d2bcd2 | 3571 | req_set_fail(req); |
14a1143b JA |
3572 | io_req_complete(req, ret); |
3573 | return 0; | |
3574 | } | |
3575 | ||
36f4fa68 JA |
3576 | static int io_shutdown_prep(struct io_kiocb *req, |
3577 | const struct io_uring_sqe *sqe) | |
3578 | { | |
3579 | #if defined(CONFIG_NET) | |
3580 | if (unlikely(req->ctx->flags & IORING_SETUP_IOPOLL)) | |
3581 | return -EINVAL; | |
3582 | if (sqe->ioprio || sqe->off || sqe->addr || sqe->rw_flags || | |
3583 | sqe->buf_index) | |
3584 | return -EINVAL; | |
3585 | ||
3586 | req->shutdown.how = READ_ONCE(sqe->len); | |
3587 | return 0; | |
3588 | #else | |
3589 | return -EOPNOTSUPP; | |
3590 | #endif | |
3591 | } | |
3592 | ||
45d189c6 | 3593 | static int io_shutdown(struct io_kiocb *req, unsigned int issue_flags) |
36f4fa68 JA |
3594 | { |
3595 | #if defined(CONFIG_NET) | |
3596 | struct socket *sock; | |
3597 | int ret; | |
3598 | ||
45d189c6 | 3599 | if (issue_flags & IO_URING_F_NONBLOCK) |
36f4fa68 JA |
3600 | return -EAGAIN; |
3601 | ||
48aba79b | 3602 | sock = sock_from_file(req->file); |
36f4fa68 | 3603 | if (unlikely(!sock)) |
48aba79b | 3604 | return -ENOTSOCK; |
36f4fa68 JA |
3605 | |
3606 | ret = __sys_shutdown_sock(sock, req->shutdown.how); | |
a146468d | 3607 | if (ret < 0) |
93d2bcd2 | 3608 | req_set_fail(req); |
36f4fa68 JA |
3609 | io_req_complete(req, ret); |
3610 | return 0; | |
3611 | #else | |
3612 | return -EOPNOTSUPP; | |
3613 | #endif | |
3614 | } | |
3615 | ||
f2a8d5c7 PB |
3616 | static int __io_splice_prep(struct io_kiocb *req, |
3617 | const struct io_uring_sqe *sqe) | |
7d67af2c | 3618 | { |
fe7e3257 | 3619 | struct io_splice *sp = &req->splice; |
7d67af2c | 3620 | unsigned int valid_flags = SPLICE_F_FD_IN_FIXED | SPLICE_F_ALL; |
7d67af2c | 3621 | |
3232dd02 PB |
3622 | if (unlikely(req->ctx->flags & IORING_SETUP_IOPOLL)) |
3623 | return -EINVAL; | |
7d67af2c PB |
3624 | |
3625 | sp->file_in = NULL; | |
7d67af2c PB |
3626 | sp->len = READ_ONCE(sqe->len); |
3627 | sp->flags = READ_ONCE(sqe->splice_flags); | |
3628 | ||
3629 | if (unlikely(sp->flags & ~valid_flags)) | |
3630 | return -EINVAL; | |
3631 | ||
ac177053 PB |
3632 | sp->file_in = io_file_get(req->ctx, NULL, req, |
3633 | READ_ONCE(sqe->splice_fd_in), | |
8371adf5 PB |
3634 | (sp->flags & SPLICE_F_FD_IN_FIXED)); |
3635 | if (!sp->file_in) | |
3636 | return -EBADF; | |
7d67af2c | 3637 | req->flags |= REQ_F_NEED_CLEANUP; |
7d67af2c PB |
3638 | return 0; |
3639 | } | |
3640 | ||
f2a8d5c7 PB |
3641 | static int io_tee_prep(struct io_kiocb *req, |
3642 | const struct io_uring_sqe *sqe) | |
3643 | { | |
3644 | if (READ_ONCE(sqe->splice_off_in) || READ_ONCE(sqe->off)) | |
3645 | return -EINVAL; | |
3646 | return __io_splice_prep(req, sqe); | |
3647 | } | |
3648 | ||
45d189c6 | 3649 | static int io_tee(struct io_kiocb *req, unsigned int issue_flags) |
f2a8d5c7 PB |
3650 | { |
3651 | struct io_splice *sp = &req->splice; | |
3652 | struct file *in = sp->file_in; | |
3653 | struct file *out = sp->file_out; | |
3654 | unsigned int flags = sp->flags & ~SPLICE_F_FD_IN_FIXED; | |
3655 | long ret = 0; | |
3656 | ||
45d189c6 | 3657 | if (issue_flags & IO_URING_F_NONBLOCK) |
f2a8d5c7 PB |
3658 | return -EAGAIN; |
3659 | if (sp->len) | |
3660 | ret = do_tee(in, out, sp->len, flags); | |
3661 | ||
e1d767f0 PB |
3662 | if (!(sp->flags & SPLICE_F_FD_IN_FIXED)) |
3663 | io_put_file(in); | |
f2a8d5c7 PB |
3664 | req->flags &= ~REQ_F_NEED_CLEANUP; |
3665 | ||
f2a8d5c7 | 3666 | if (ret != sp->len) |
93d2bcd2 | 3667 | req_set_fail(req); |
e1e16097 | 3668 | io_req_complete(req, ret); |
f2a8d5c7 PB |
3669 | return 0; |
3670 | } | |
3671 | ||
3672 | static int io_splice_prep(struct io_kiocb *req, const struct io_uring_sqe *sqe) | |
3673 | { | |
fe7e3257 | 3674 | struct io_splice *sp = &req->splice; |
f2a8d5c7 PB |
3675 | |
3676 | sp->off_in = READ_ONCE(sqe->splice_off_in); | |
3677 | sp->off_out = READ_ONCE(sqe->off); | |
3678 | return __io_splice_prep(req, sqe); | |
3679 | } | |
3680 | ||
45d189c6 | 3681 | static int io_splice(struct io_kiocb *req, unsigned int issue_flags) |
7d67af2c PB |
3682 | { |
3683 | struct io_splice *sp = &req->splice; | |
3684 | struct file *in = sp->file_in; | |
3685 | struct file *out = sp->file_out; | |
3686 | unsigned int flags = sp->flags & ~SPLICE_F_FD_IN_FIXED; | |
3687 | loff_t *poff_in, *poff_out; | |
c9687426 | 3688 | long ret = 0; |
7d67af2c | 3689 | |
45d189c6 | 3690 | if (issue_flags & IO_URING_F_NONBLOCK) |
2fb3e822 | 3691 | return -EAGAIN; |
7d67af2c PB |
3692 | |
3693 | poff_in = (sp->off_in == -1) ? NULL : &sp->off_in; | |
3694 | poff_out = (sp->off_out == -1) ? NULL : &sp->off_out; | |
c9687426 | 3695 | |
948a7749 | 3696 | if (sp->len) |
c9687426 | 3697 | ret = do_splice(in, poff_in, out, poff_out, sp->len, flags); |
7d67af2c | 3698 | |
e1d767f0 PB |
3699 | if (!(sp->flags & SPLICE_F_FD_IN_FIXED)) |
3700 | io_put_file(in); | |
7d67af2c PB |
3701 | req->flags &= ~REQ_F_NEED_CLEANUP; |
3702 | ||
7d67af2c | 3703 | if (ret != sp->len) |
93d2bcd2 | 3704 | req_set_fail(req); |
e1e16097 | 3705 | io_req_complete(req, ret); |
7d67af2c PB |
3706 | return 0; |
3707 | } | |
3708 | ||
2b188cc1 JA |
3709 | /* |
3710 | * IORING_OP_NOP just posts a completion event, nothing else. | |
3711 | */ | |
889fca73 | 3712 | static int io_nop(struct io_kiocb *req, unsigned int issue_flags) |
2b188cc1 JA |
3713 | { |
3714 | struct io_ring_ctx *ctx = req->ctx; | |
2b188cc1 | 3715 | |
def596e9 JA |
3716 | if (unlikely(ctx->flags & IORING_SETUP_IOPOLL)) |
3717 | return -EINVAL; | |
3718 | ||
889fca73 | 3719 | __io_req_complete(req, issue_flags, 0, 0); |
2b188cc1 JA |
3720 | return 0; |
3721 | } | |
3722 | ||
1155c76a | 3723 | static int io_fsync_prep(struct io_kiocb *req, const struct io_uring_sqe *sqe) |
c992fe29 | 3724 | { |
6b06314c | 3725 | struct io_ring_ctx *ctx = req->ctx; |
c992fe29 | 3726 | |
09bb8394 JA |
3727 | if (!req->file) |
3728 | return -EBADF; | |
c992fe29 | 3729 | |
6b06314c | 3730 | if (unlikely(ctx->flags & IORING_SETUP_IOPOLL)) |
def596e9 | 3731 | return -EINVAL; |
edafccee | 3732 | if (unlikely(sqe->addr || sqe->ioprio || sqe->buf_index)) |
c992fe29 CH |
3733 | return -EINVAL; |
3734 | ||
8ed8d3c3 JA |
3735 | req->sync.flags = READ_ONCE(sqe->fsync_flags); |
3736 | if (unlikely(req->sync.flags & ~IORING_FSYNC_DATASYNC)) | |
3737 | return -EINVAL; | |
3738 | ||
3739 | req->sync.off = READ_ONCE(sqe->off); | |
3740 | req->sync.len = READ_ONCE(sqe->len); | |
c992fe29 CH |
3741 | return 0; |
3742 | } | |
3743 | ||
45d189c6 | 3744 | static int io_fsync(struct io_kiocb *req, unsigned int issue_flags) |
8ed8d3c3 | 3745 | { |
8ed8d3c3 | 3746 | loff_t end = req->sync.off + req->sync.len; |
8ed8d3c3 JA |
3747 | int ret; |
3748 | ||
ac45abc0 | 3749 | /* fsync always requires a blocking context */ |
45d189c6 | 3750 | if (issue_flags & IO_URING_F_NONBLOCK) |
ac45abc0 PB |
3751 | return -EAGAIN; |
3752 | ||
9adbd45d | 3753 | ret = vfs_fsync_range(req->file, req->sync.off, |
8ed8d3c3 JA |
3754 | end > 0 ? end : LLONG_MAX, |
3755 | req->sync.flags & IORING_FSYNC_DATASYNC); | |
3756 | if (ret < 0) | |
93d2bcd2 | 3757 | req_set_fail(req); |
e1e16097 | 3758 | io_req_complete(req, ret); |
c992fe29 CH |
3759 | return 0; |
3760 | } | |
3761 | ||
d63d1b5e JA |
3762 | static int io_fallocate_prep(struct io_kiocb *req, |
3763 | const struct io_uring_sqe *sqe) | |
3764 | { | |
3765 | if (sqe->ioprio || sqe->buf_index || sqe->rw_flags) | |
3766 | return -EINVAL; | |
3232dd02 PB |
3767 | if (unlikely(req->ctx->flags & IORING_SETUP_IOPOLL)) |
3768 | return -EINVAL; | |
d63d1b5e JA |
3769 | |
3770 | req->sync.off = READ_ONCE(sqe->off); | |
3771 | req->sync.len = READ_ONCE(sqe->addr); | |
3772 | req->sync.mode = READ_ONCE(sqe->len); | |
3773 | return 0; | |
3774 | } | |
3775 | ||
45d189c6 | 3776 | static int io_fallocate(struct io_kiocb *req, unsigned int issue_flags) |
5d17b4a4 | 3777 | { |
ac45abc0 PB |
3778 | int ret; |
3779 | ||
d63d1b5e | 3780 | /* fallocate always requiring blocking context */ |
45d189c6 | 3781 | if (issue_flags & IO_URING_F_NONBLOCK) |
5d17b4a4 | 3782 | return -EAGAIN; |
ac45abc0 PB |
3783 | ret = vfs_fallocate(req->file, req->sync.mode, req->sync.off, |
3784 | req->sync.len); | |
ac45abc0 | 3785 | if (ret < 0) |
93d2bcd2 | 3786 | req_set_fail(req); |
e1e16097 | 3787 | io_req_complete(req, ret); |
5d17b4a4 JA |
3788 | return 0; |
3789 | } | |
3790 | ||
ec65fea5 | 3791 | static int __io_openat_prep(struct io_kiocb *req, const struct io_uring_sqe *sqe) |
b7bb4f7d | 3792 | { |
f8748881 | 3793 | const char __user *fname; |
15b71abe | 3794 | int ret; |
b7bb4f7d | 3795 | |
ec65fea5 | 3796 | if (unlikely(sqe->ioprio || sqe->buf_index)) |
15b71abe | 3797 | return -EINVAL; |
ec65fea5 | 3798 | if (unlikely(req->flags & REQ_F_FIXED_FILE)) |
cf3040ca | 3799 | return -EBADF; |
03b1230c | 3800 | |
ec65fea5 PB |
3801 | /* open.how should be already initialised */ |
3802 | if (!(req->open.how.flags & O_PATH) && force_o_largefile()) | |
08a1d26e | 3803 | req->open.how.flags |= O_LARGEFILE; |
3529d8c2 | 3804 | |
25e72d10 PB |
3805 | req->open.dfd = READ_ONCE(sqe->fd); |
3806 | fname = u64_to_user_ptr(READ_ONCE(sqe->addr)); | |
f8748881 | 3807 | req->open.filename = getname(fname); |
15b71abe JA |
3808 | if (IS_ERR(req->open.filename)) { |
3809 | ret = PTR_ERR(req->open.filename); | |
3810 | req->open.filename = NULL; | |
3811 | return ret; | |
3812 | } | |
4022e7af | 3813 | req->open.nofile = rlimit(RLIMIT_NOFILE); |
8fef80bf | 3814 | req->flags |= REQ_F_NEED_CLEANUP; |
15b71abe | 3815 | return 0; |
03b1230c JA |
3816 | } |
3817 | ||
ec65fea5 PB |
3818 | static int io_openat_prep(struct io_kiocb *req, const struct io_uring_sqe *sqe) |
3819 | { | |
3820 | u64 flags, mode; | |
3821 | ||
14587a46 | 3822 | if (unlikely(req->ctx->flags & IORING_SETUP_IOPOLL)) |
4eb8dded | 3823 | return -EINVAL; |
ec65fea5 PB |
3824 | mode = READ_ONCE(sqe->len); |
3825 | flags = READ_ONCE(sqe->open_flags); | |
3826 | req->open.how = build_open_how(flags, mode); | |
3827 | return __io_openat_prep(req, sqe); | |
3828 | } | |
3829 | ||
cebdb986 | 3830 | static int io_openat2_prep(struct io_kiocb *req, const struct io_uring_sqe *sqe) |
aa1fa28f | 3831 | { |
cebdb986 | 3832 | struct open_how __user *how; |
cebdb986 | 3833 | size_t len; |
0fa03c62 JA |
3834 | int ret; |
3835 | ||
14587a46 | 3836 | if (unlikely(req->ctx->flags & IORING_SETUP_IOPOLL)) |
4eb8dded | 3837 | return -EINVAL; |
cebdb986 JA |
3838 | how = u64_to_user_ptr(READ_ONCE(sqe->addr2)); |
3839 | len = READ_ONCE(sqe->len); | |
cebdb986 JA |
3840 | if (len < OPEN_HOW_SIZE_VER0) |
3841 | return -EINVAL; | |
3529d8c2 | 3842 | |
cebdb986 JA |
3843 | ret = copy_struct_from_user(&req->open.how, sizeof(req->open.how), how, |
3844 | len); | |
3845 | if (ret) | |
3846 | return ret; | |
3529d8c2 | 3847 | |
ec65fea5 | 3848 | return __io_openat_prep(req, sqe); |
cebdb986 JA |
3849 | } |
3850 | ||
45d189c6 | 3851 | static int io_openat2(struct io_kiocb *req, unsigned int issue_flags) |
15b71abe JA |
3852 | { |
3853 | struct open_flags op; | |
15b71abe | 3854 | struct file *file; |
3a81fd02 JA |
3855 | bool nonblock_set; |
3856 | bool resolve_nonblock; | |
15b71abe JA |
3857 | int ret; |
3858 | ||
cebdb986 | 3859 | ret = build_open_flags(&req->open.how, &op); |
15b71abe JA |
3860 | if (ret) |
3861 | goto err; | |
3a81fd02 JA |
3862 | nonblock_set = op.open_flag & O_NONBLOCK; |
3863 | resolve_nonblock = req->open.how.resolve & RESOLVE_CACHED; | |
45d189c6 | 3864 | if (issue_flags & IO_URING_F_NONBLOCK) { |
3a81fd02 JA |
3865 | /* |
3866 | * Don't bother trying for O_TRUNC, O_CREAT, or O_TMPFILE open, | |
3867 | * it'll always -EAGAIN | |
3868 | */ | |
3869 | if (req->open.how.flags & (O_TRUNC | O_CREAT | O_TMPFILE)) | |
3870 | return -EAGAIN; | |
3871 | op.lookup_flags |= LOOKUP_CACHED; | |
3872 | op.open_flag |= O_NONBLOCK; | |
3873 | } | |
15b71abe | 3874 | |
4022e7af | 3875 | ret = __get_unused_fd_flags(req->open.how.flags, req->open.nofile); |
15b71abe JA |
3876 | if (ret < 0) |
3877 | goto err; | |
3878 | ||
3879 | file = do_filp_open(req->open.dfd, req->open.filename, &op); | |
12dcb58a | 3880 | if (IS_ERR(file)) { |
944d1444 | 3881 | /* |
12dcb58a PB |
3882 | * We could hang on to this 'fd' on retrying, but seems like |
3883 | * marginal gain for something that is now known to be a slower | |
3884 | * path. So just put it, and we'll get a new one when we retry. | |
944d1444 | 3885 | */ |
3a81fd02 | 3886 | put_unused_fd(ret); |
3a81fd02 | 3887 | |
15b71abe | 3888 | ret = PTR_ERR(file); |
12dcb58a PB |
3889 | /* only retry if RESOLVE_CACHED wasn't already set by application */ |
3890 | if (ret == -EAGAIN && | |
3891 | (!resolve_nonblock && (issue_flags & IO_URING_F_NONBLOCK))) | |
3892 | return -EAGAIN; | |
3893 | goto err; | |
15b71abe | 3894 | } |
12dcb58a PB |
3895 | |
3896 | if ((issue_flags & IO_URING_F_NONBLOCK) && !nonblock_set) | |
3897 | file->f_flags &= ~O_NONBLOCK; | |
3898 | fsnotify_open(file); | |
3899 | fd_install(ret, file); | |
15b71abe JA |
3900 | err: |
3901 | putname(req->open.filename); | |
8fef80bf | 3902 | req->flags &= ~REQ_F_NEED_CLEANUP; |
15b71abe | 3903 | if (ret < 0) |
93d2bcd2 | 3904 | req_set_fail(req); |
0bdf3398 | 3905 | __io_req_complete(req, issue_flags, ret, 0); |
15b71abe JA |
3906 | return 0; |
3907 | } | |
3908 | ||
45d189c6 | 3909 | static int io_openat(struct io_kiocb *req, unsigned int issue_flags) |
cebdb986 | 3910 | { |
e45cff58 | 3911 | return io_openat2(req, issue_flags); |
cebdb986 JA |
3912 | } |
3913 | ||
067524e9 JA |
3914 | static int io_remove_buffers_prep(struct io_kiocb *req, |
3915 | const struct io_uring_sqe *sqe) | |
3916 | { | |
3917 | struct io_provide_buf *p = &req->pbuf; | |
3918 | u64 tmp; | |
3919 | ||
3920 | if (sqe->ioprio || sqe->rw_flags || sqe->addr || sqe->len || sqe->off) | |
3921 | return -EINVAL; | |
3922 | ||
3923 | tmp = READ_ONCE(sqe->fd); | |
3924 | if (!tmp || tmp > USHRT_MAX) | |
3925 | return -EINVAL; | |
3926 | ||
3927 | memset(p, 0, sizeof(*p)); | |
3928 | p->nbufs = tmp; | |
3929 | p->bgid = READ_ONCE(sqe->buf_group); | |
3930 | return 0; | |
3931 | } | |
3932 | ||
3933 | static int __io_remove_buffers(struct io_ring_ctx *ctx, struct io_buffer *buf, | |
3934 | int bgid, unsigned nbufs) | |
3935 | { | |
3936 | unsigned i = 0; | |
3937 | ||
3938 | /* shouldn't happen */ | |
3939 | if (!nbufs) | |
3940 | return 0; | |
3941 | ||
3942 | /* the head kbuf is the list itself */ | |
3943 | while (!list_empty(&buf->list)) { | |
3944 | struct io_buffer *nxt; | |
3945 | ||
3946 | nxt = list_first_entry(&buf->list, struct io_buffer, list); | |
3947 | list_del(&nxt->list); | |
3948 | kfree(nxt); | |
3949 | if (++i == nbufs) | |
3950 | return i; | |
3951 | } | |
3952 | i++; | |
3953 | kfree(buf); | |
9e15c3a0 | 3954 | xa_erase(&ctx->io_buffers, bgid); |
067524e9 JA |
3955 | |
3956 | return i; | |
3957 | } | |
3958 | ||
889fca73 | 3959 | static int io_remove_buffers(struct io_kiocb *req, unsigned int issue_flags) |
067524e9 JA |
3960 | { |
3961 | struct io_provide_buf *p = &req->pbuf; | |
3962 | struct io_ring_ctx *ctx = req->ctx; | |
3963 | struct io_buffer *head; | |
3964 | int ret = 0; | |
45d189c6 | 3965 | bool force_nonblock = issue_flags & IO_URING_F_NONBLOCK; |
067524e9 JA |
3966 | |
3967 | io_ring_submit_lock(ctx, !force_nonblock); | |
3968 | ||
3969 | lockdep_assert_held(&ctx->uring_lock); | |
3970 | ||
3971 | ret = -ENOENT; | |
9e15c3a0 | 3972 | head = xa_load(&ctx->io_buffers, p->bgid); |
067524e9 JA |
3973 | if (head) |
3974 | ret = __io_remove_buffers(ctx, head, p->bgid, p->nbufs); | |
067524e9 | 3975 | if (ret < 0) |
93d2bcd2 | 3976 | req_set_fail(req); |
067524e9 | 3977 | |
9fb8cb49 PB |
3978 | /* complete before unlock, IOPOLL may need the lock */ |
3979 | __io_req_complete(req, issue_flags, ret, 0); | |
3980 | io_ring_submit_unlock(ctx, !force_nonblock); | |
067524e9 JA |
3981 | return 0; |
3982 | } | |
3983 | ||
ddf0322d JA |
3984 | static int io_provide_buffers_prep(struct io_kiocb *req, |
3985 | const struct io_uring_sqe *sqe) | |
3986 | { | |
38134ada | 3987 | unsigned long size, tmp_check; |
ddf0322d JA |
3988 | struct io_provide_buf *p = &req->pbuf; |
3989 | u64 tmp; | |
3990 | ||
3991 | if (sqe->ioprio || sqe->rw_flags) | |
3992 | return -EINVAL; | |
3993 | ||
3994 | tmp = READ_ONCE(sqe->fd); | |
3995 | if (!tmp || tmp > USHRT_MAX) | |
3996 | return -E2BIG; | |
3997 | p->nbufs = tmp; | |
3998 | p->addr = READ_ONCE(sqe->addr); | |
3999 | p->len = READ_ONCE(sqe->len); | |
4000 | ||
38134ada PB |
4001 | if (check_mul_overflow((unsigned long)p->len, (unsigned long)p->nbufs, |
4002 | &size)) | |
4003 | return -EOVERFLOW; | |
4004 | if (check_add_overflow((unsigned long)p->addr, size, &tmp_check)) | |
4005 | return -EOVERFLOW; | |
4006 | ||
d81269fe PB |
4007 | size = (unsigned long)p->len * p->nbufs; |
4008 | if (!access_ok(u64_to_user_ptr(p->addr), size)) | |
ddf0322d JA |
4009 | return -EFAULT; |
4010 | ||
4011 | p->bgid = READ_ONCE(sqe->buf_group); | |
4012 | tmp = READ_ONCE(sqe->off); | |
4013 | if (tmp > USHRT_MAX) | |
4014 | return -E2BIG; | |
4015 | p->bid = tmp; | |
4016 | return 0; | |
4017 | } | |
4018 | ||
4019 | static int io_add_buffers(struct io_provide_buf *pbuf, struct io_buffer **head) | |
4020 | { | |
4021 | struct io_buffer *buf; | |
4022 | u64 addr = pbuf->addr; | |
4023 | int i, bid = pbuf->bid; | |
4024 | ||
4025 | for (i = 0; i < pbuf->nbufs; i++) { | |
4026 | buf = kmalloc(sizeof(*buf), GFP_KERNEL); | |
4027 | if (!buf) | |
4028 | break; | |
4029 | ||
4030 | buf->addr = addr; | |
d1f82808 | 4031 | buf->len = min_t(__u32, pbuf->len, MAX_RW_COUNT); |
ddf0322d JA |
4032 | buf->bid = bid; |
4033 | addr += pbuf->len; | |
4034 | bid++; | |
4035 | if (!*head) { | |
4036 | INIT_LIST_HEAD(&buf->list); | |
4037 | *head = buf; | |
4038 | } else { | |
4039 | list_add_tail(&buf->list, &(*head)->list); | |
4040 | } | |
4041 | } | |
4042 | ||
4043 | return i ? i : -ENOMEM; | |
4044 | } | |
4045 | ||
889fca73 | 4046 | static int io_provide_buffers(struct io_kiocb *req, unsigned int issue_flags) |
ddf0322d JA |
4047 | { |
4048 | struct io_provide_buf *p = &req->pbuf; | |
4049 | struct io_ring_ctx *ctx = req->ctx; | |
4050 | struct io_buffer *head, *list; | |
4051 | int ret = 0; | |
45d189c6 | 4052 | bool force_nonblock = issue_flags & IO_URING_F_NONBLOCK; |
ddf0322d JA |
4053 | |
4054 | io_ring_submit_lock(ctx, !force_nonblock); | |
4055 | ||
4056 | lockdep_assert_held(&ctx->uring_lock); | |
4057 | ||
9e15c3a0 | 4058 | list = head = xa_load(&ctx->io_buffers, p->bgid); |
ddf0322d JA |
4059 | |
4060 | ret = io_add_buffers(p, &head); | |
9e15c3a0 JA |
4061 | if (ret >= 0 && !list) { |
4062 | ret = xa_insert(&ctx->io_buffers, p->bgid, head, GFP_KERNEL); | |
4063 | if (ret < 0) | |
067524e9 | 4064 | __io_remove_buffers(ctx, head, p->bgid, -1U); |
ddf0322d | 4065 | } |
ddf0322d | 4066 | if (ret < 0) |
93d2bcd2 | 4067 | req_set_fail(req); |
9fb8cb49 PB |
4068 | /* complete before unlock, IOPOLL may need the lock */ |
4069 | __io_req_complete(req, issue_flags, ret, 0); | |
4070 | io_ring_submit_unlock(ctx, !force_nonblock); | |
ddf0322d | 4071 | return 0; |
cebdb986 JA |
4072 | } |
4073 | ||
3e4827b0 JA |
4074 | static int io_epoll_ctl_prep(struct io_kiocb *req, |
4075 | const struct io_uring_sqe *sqe) | |
4076 | { | |
4077 | #if defined(CONFIG_EPOLL) | |
4078 | if (sqe->ioprio || sqe->buf_index) | |
4079 | return -EINVAL; | |
2d74d042 | 4080 | if (unlikely(req->ctx->flags & IORING_SETUP_IOPOLL)) |
3232dd02 | 4081 | return -EINVAL; |
3e4827b0 JA |
4082 | |
4083 | req->epoll.epfd = READ_ONCE(sqe->fd); | |
4084 | req->epoll.op = READ_ONCE(sqe->len); | |
4085 | req->epoll.fd = READ_ONCE(sqe->off); | |
4086 | ||
4087 | if (ep_op_has_event(req->epoll.op)) { | |
4088 | struct epoll_event __user *ev; | |
4089 | ||
4090 | ev = u64_to_user_ptr(READ_ONCE(sqe->addr)); | |
4091 | if (copy_from_user(&req->epoll.event, ev, sizeof(*ev))) | |
4092 | return -EFAULT; | |
4093 | } | |
4094 | ||
4095 | return 0; | |
4096 | #else | |
4097 | return -EOPNOTSUPP; | |
4098 | #endif | |
4099 | } | |
4100 | ||
889fca73 | 4101 | static int io_epoll_ctl(struct io_kiocb *req, unsigned int issue_flags) |
3e4827b0 JA |
4102 | { |
4103 | #if defined(CONFIG_EPOLL) | |
4104 | struct io_epoll *ie = &req->epoll; | |
4105 | int ret; | |
45d189c6 | 4106 | bool force_nonblock = issue_flags & IO_URING_F_NONBLOCK; |
3e4827b0 JA |
4107 | |
4108 | ret = do_epoll_ctl(ie->epfd, ie->op, ie->fd, &ie->event, force_nonblock); | |
4109 | if (force_nonblock && ret == -EAGAIN) | |
4110 | return -EAGAIN; | |
4111 | ||
4112 | if (ret < 0) | |
93d2bcd2 | 4113 | req_set_fail(req); |
889fca73 | 4114 | __io_req_complete(req, issue_flags, ret, 0); |
3e4827b0 JA |
4115 | return 0; |
4116 | #else | |
4117 | return -EOPNOTSUPP; | |
4118 | #endif | |
4119 | } | |
4120 | ||
c1ca757b JA |
4121 | static int io_madvise_prep(struct io_kiocb *req, const struct io_uring_sqe *sqe) |
4122 | { | |
4123 | #if defined(CONFIG_ADVISE_SYSCALLS) && defined(CONFIG_MMU) | |
4124 | if (sqe->ioprio || sqe->buf_index || sqe->off) | |
4125 | return -EINVAL; | |
3232dd02 PB |
4126 | if (unlikely(req->ctx->flags & IORING_SETUP_IOPOLL)) |
4127 | return -EINVAL; | |
c1ca757b JA |
4128 | |
4129 | req->madvise.addr = READ_ONCE(sqe->addr); | |
4130 | req->madvise.len = READ_ONCE(sqe->len); | |
4131 | req->madvise.advice = READ_ONCE(sqe->fadvise_advice); | |
4132 | return 0; | |
4133 | #else | |
4134 | return -EOPNOTSUPP; | |
4135 | #endif | |
4136 | } | |
4137 | ||
45d189c6 | 4138 | static int io_madvise(struct io_kiocb *req, unsigned int issue_flags) |
c1ca757b JA |
4139 | { |
4140 | #if defined(CONFIG_ADVISE_SYSCALLS) && defined(CONFIG_MMU) | |
4141 | struct io_madvise *ma = &req->madvise; | |
4142 | int ret; | |
4143 | ||
45d189c6 | 4144 | if (issue_flags & IO_URING_F_NONBLOCK) |
c1ca757b JA |
4145 | return -EAGAIN; |
4146 | ||
0726b01e | 4147 | ret = do_madvise(current->mm, ma->addr, ma->len, ma->advice); |
c1ca757b | 4148 | if (ret < 0) |
93d2bcd2 | 4149 | req_set_fail(req); |
e1e16097 | 4150 | io_req_complete(req, ret); |
c1ca757b JA |
4151 | return 0; |
4152 | #else | |
4153 | return -EOPNOTSUPP; | |
4154 | #endif | |
4155 | } | |
4156 | ||
4840e418 JA |
4157 | static int io_fadvise_prep(struct io_kiocb *req, const struct io_uring_sqe *sqe) |
4158 | { | |
4159 | if (sqe->ioprio || sqe->buf_index || sqe->addr) | |
4160 | return -EINVAL; | |
3232dd02 PB |
4161 | if (unlikely(req->ctx->flags & IORING_SETUP_IOPOLL)) |
4162 | return -EINVAL; | |
4840e418 JA |
4163 | |
4164 | req->fadvise.offset = READ_ONCE(sqe->off); | |
4165 | req->fadvise.len = READ_ONCE(sqe->len); | |
4166 | req->fadvise.advice = READ_ONCE(sqe->fadvise_advice); | |
4167 | return 0; | |
4168 | } | |
4169 | ||
45d189c6 | 4170 | static int io_fadvise(struct io_kiocb *req, unsigned int issue_flags) |
4840e418 JA |
4171 | { |
4172 | struct io_fadvise *fa = &req->fadvise; | |
4173 | int ret; | |
4174 | ||
45d189c6 | 4175 | if (issue_flags & IO_URING_F_NONBLOCK) { |
3e69426d JA |
4176 | switch (fa->advice) { |
4177 | case POSIX_FADV_NORMAL: | |
4178 | case POSIX_FADV_RANDOM: | |
4179 | case POSIX_FADV_SEQUENTIAL: | |
4180 | break; | |
4181 | default: | |
4182 | return -EAGAIN; | |
4183 | } | |
4184 | } | |
4840e418 JA |
4185 | |
4186 | ret = vfs_fadvise(req->file, fa->offset, fa->len, fa->advice); | |
4187 | if (ret < 0) | |
93d2bcd2 | 4188 | req_set_fail(req); |
0bdf3398 | 4189 | __io_req_complete(req, issue_flags, ret, 0); |
4840e418 JA |
4190 | return 0; |
4191 | } | |
4192 | ||
eddc7ef5 JA |
4193 | static int io_statx_prep(struct io_kiocb *req, const struct io_uring_sqe *sqe) |
4194 | { | |
2d74d042 | 4195 | if (unlikely(req->ctx->flags & IORING_SETUP_IOPOLL)) |
3232dd02 | 4196 | return -EINVAL; |
eddc7ef5 JA |
4197 | if (sqe->ioprio || sqe->buf_index) |
4198 | return -EINVAL; | |
9c280f90 | 4199 | if (req->flags & REQ_F_FIXED_FILE) |
cf3040ca | 4200 | return -EBADF; |
eddc7ef5 | 4201 | |
1d9e1288 BM |
4202 | req->statx.dfd = READ_ONCE(sqe->fd); |
4203 | req->statx.mask = READ_ONCE(sqe->len); | |
e62753e4 | 4204 | req->statx.filename = u64_to_user_ptr(READ_ONCE(sqe->addr)); |
1d9e1288 BM |
4205 | req->statx.buffer = u64_to_user_ptr(READ_ONCE(sqe->addr2)); |
4206 | req->statx.flags = READ_ONCE(sqe->statx_flags); | |
eddc7ef5 JA |
4207 | |
4208 | return 0; | |
4209 | } | |
4210 | ||
45d189c6 | 4211 | static int io_statx(struct io_kiocb *req, unsigned int issue_flags) |
eddc7ef5 | 4212 | { |
1d9e1288 | 4213 | struct io_statx *ctx = &req->statx; |
eddc7ef5 JA |
4214 | int ret; |
4215 | ||
59d70013 | 4216 | if (issue_flags & IO_URING_F_NONBLOCK) |
eddc7ef5 JA |
4217 | return -EAGAIN; |
4218 | ||
e62753e4 BM |
4219 | ret = do_statx(ctx->dfd, ctx->filename, ctx->flags, ctx->mask, |
4220 | ctx->buffer); | |
eddc7ef5 | 4221 | |
eddc7ef5 | 4222 | if (ret < 0) |
93d2bcd2 | 4223 | req_set_fail(req); |
e1e16097 | 4224 | io_req_complete(req, ret); |
eddc7ef5 JA |
4225 | return 0; |
4226 | } | |
4227 | ||
b5dba59e JA |
4228 | static int io_close_prep(struct io_kiocb *req, const struct io_uring_sqe *sqe) |
4229 | { | |
14587a46 | 4230 | if (unlikely(req->ctx->flags & IORING_SETUP_IOPOLL)) |
3232dd02 | 4231 | return -EINVAL; |
b5dba59e JA |
4232 | if (sqe->ioprio || sqe->off || sqe->addr || sqe->len || |
4233 | sqe->rw_flags || sqe->buf_index) | |
4234 | return -EINVAL; | |
9c280f90 | 4235 | if (req->flags & REQ_F_FIXED_FILE) |
cf3040ca | 4236 | return -EBADF; |
b5dba59e JA |
4237 | |
4238 | req->close.fd = READ_ONCE(sqe->fd); | |
b5dba59e | 4239 | return 0; |
b5dba59e JA |
4240 | } |
4241 | ||
889fca73 | 4242 | static int io_close(struct io_kiocb *req, unsigned int issue_flags) |
b5dba59e | 4243 | { |
9eac1904 | 4244 | struct files_struct *files = current->files; |
3af73b28 | 4245 | struct io_close *close = &req->close; |
9eac1904 | 4246 | struct fdtable *fdt; |
a1fde923 PB |
4247 | struct file *file = NULL; |
4248 | int ret = -EBADF; | |
b5dba59e | 4249 | |
9eac1904 JA |
4250 | spin_lock(&files->file_lock); |
4251 | fdt = files_fdtable(files); | |
4252 | if (close->fd >= fdt->max_fds) { | |
4253 | spin_unlock(&files->file_lock); | |
4254 | goto err; | |
4255 | } | |
4256 | file = fdt->fd[close->fd]; | |
a1fde923 | 4257 | if (!file || file->f_op == &io_uring_fops) { |
9eac1904 JA |
4258 | spin_unlock(&files->file_lock); |
4259 | file = NULL; | |
4260 | goto err; | |
3af73b28 | 4261 | } |
b5dba59e JA |
4262 | |
4263 | /* if the file has a flush method, be safe and punt to async */ | |
45d189c6 | 4264 | if (file->f_op->flush && (issue_flags & IO_URING_F_NONBLOCK)) { |
9eac1904 | 4265 | spin_unlock(&files->file_lock); |
0bf0eefd | 4266 | return -EAGAIN; |
a2100672 | 4267 | } |
b5dba59e | 4268 | |
9eac1904 JA |
4269 | ret = __close_fd_get_file(close->fd, &file); |
4270 | spin_unlock(&files->file_lock); | |
4271 | if (ret < 0) { | |
4272 | if (ret == -ENOENT) | |
4273 | ret = -EBADF; | |
4274 | goto err; | |
4275 | } | |
4276 | ||
3af73b28 | 4277 | /* No ->flush() or already async, safely close from here */ |
9eac1904 JA |
4278 | ret = filp_close(file, current->files); |
4279 | err: | |
3af73b28 | 4280 | if (ret < 0) |
93d2bcd2 | 4281 | req_set_fail(req); |
9eac1904 JA |
4282 | if (file) |
4283 | fput(file); | |
889fca73 | 4284 | __io_req_complete(req, issue_flags, ret, 0); |
1a417f4e | 4285 | return 0; |
b5dba59e JA |
4286 | } |
4287 | ||
1155c76a | 4288 | static int io_sfr_prep(struct io_kiocb *req, const struct io_uring_sqe *sqe) |
5d17b4a4 JA |
4289 | { |
4290 | struct io_ring_ctx *ctx = req->ctx; | |
5d17b4a4 | 4291 | |
5d17b4a4 JA |
4292 | if (unlikely(ctx->flags & IORING_SETUP_IOPOLL)) |
4293 | return -EINVAL; | |
4294 | if (unlikely(sqe->addr || sqe->ioprio || sqe->buf_index)) | |
4295 | return -EINVAL; | |
4296 | ||
8ed8d3c3 JA |
4297 | req->sync.off = READ_ONCE(sqe->off); |
4298 | req->sync.len = READ_ONCE(sqe->len); | |
4299 | req->sync.flags = READ_ONCE(sqe->sync_range_flags); | |
8ed8d3c3 JA |
4300 | return 0; |
4301 | } | |
4302 | ||
45d189c6 | 4303 | static int io_sync_file_range(struct io_kiocb *req, unsigned int issue_flags) |
8ed8d3c3 | 4304 | { |
8ed8d3c3 JA |
4305 | int ret; |
4306 | ||
ac45abc0 | 4307 | /* sync_file_range always requires a blocking context */ |
45d189c6 | 4308 | if (issue_flags & IO_URING_F_NONBLOCK) |
ac45abc0 PB |
4309 | return -EAGAIN; |
4310 | ||
9adbd45d | 4311 | ret = sync_file_range(req->file, req->sync.off, req->sync.len, |
8ed8d3c3 JA |
4312 | req->sync.flags); |
4313 | if (ret < 0) | |
93d2bcd2 | 4314 | req_set_fail(req); |
e1e16097 | 4315 | io_req_complete(req, ret); |
5d17b4a4 JA |
4316 | return 0; |
4317 | } | |
4318 | ||
469956e8 | 4319 | #if defined(CONFIG_NET) |
02d27d89 PB |
4320 | static int io_setup_async_msg(struct io_kiocb *req, |
4321 | struct io_async_msghdr *kmsg) | |
4322 | { | |
e8c2bc1f JA |
4323 | struct io_async_msghdr *async_msg = req->async_data; |
4324 | ||
4325 | if (async_msg) | |
02d27d89 | 4326 | return -EAGAIN; |
e8c2bc1f | 4327 | if (io_alloc_async_data(req)) { |
257e84a5 | 4328 | kfree(kmsg->free_iov); |
02d27d89 PB |
4329 | return -ENOMEM; |
4330 | } | |
e8c2bc1f | 4331 | async_msg = req->async_data; |
02d27d89 | 4332 | req->flags |= REQ_F_NEED_CLEANUP; |
e8c2bc1f | 4333 | memcpy(async_msg, kmsg, sizeof(*kmsg)); |
2a780802 | 4334 | async_msg->msg.msg_name = &async_msg->addr; |
257e84a5 PB |
4335 | /* if were using fast_iov, set it to the new one */ |
4336 | if (!async_msg->free_iov) | |
4337 | async_msg->msg.msg_iter.iov = async_msg->fast_iov; | |
4338 | ||
02d27d89 PB |
4339 | return -EAGAIN; |
4340 | } | |
4341 | ||
2ae523ed PB |
4342 | static int io_sendmsg_copy_hdr(struct io_kiocb *req, |
4343 | struct io_async_msghdr *iomsg) | |
4344 | { | |
2ae523ed | 4345 | iomsg->msg.msg_name = &iomsg->addr; |
257e84a5 | 4346 | iomsg->free_iov = iomsg->fast_iov; |
2ae523ed | 4347 | return sendmsg_copy_msghdr(&iomsg->msg, req->sr_msg.umsg, |
257e84a5 | 4348 | req->sr_msg.msg_flags, &iomsg->free_iov); |
2ae523ed PB |
4349 | } |
4350 | ||
93642ef8 PB |
4351 | static int io_sendmsg_prep_async(struct io_kiocb *req) |
4352 | { | |
4353 | int ret; | |
4354 | ||
93642ef8 PB |
4355 | ret = io_sendmsg_copy_hdr(req, req->async_data); |
4356 | if (!ret) | |
4357 | req->flags |= REQ_F_NEED_CLEANUP; | |
4358 | return ret; | |
4359 | } | |
4360 | ||
3529d8c2 | 4361 | static int io_sendmsg_prep(struct io_kiocb *req, const struct io_uring_sqe *sqe) |
03b1230c | 4362 | { |
e47293fd | 4363 | struct io_sr_msg *sr = &req->sr_msg; |
03b1230c | 4364 | |
d2b6f48b PB |
4365 | if (unlikely(req->ctx->flags & IORING_SETUP_IOPOLL)) |
4366 | return -EINVAL; | |
4367 | ||
270a5940 | 4368 | sr->umsg = u64_to_user_ptr(READ_ONCE(sqe->addr)); |
fddaface | 4369 | sr->len = READ_ONCE(sqe->len); |
04411806 PB |
4370 | sr->msg_flags = READ_ONCE(sqe->msg_flags) | MSG_NOSIGNAL; |
4371 | if (sr->msg_flags & MSG_DONTWAIT) | |
4372 | req->flags |= REQ_F_NOWAIT; | |
3529d8c2 | 4373 | |
d8768362 JA |
4374 | #ifdef CONFIG_COMPAT |
4375 | if (req->ctx->compat) | |
4376 | sr->msg_flags |= MSG_CMSG_COMPAT; | |
4377 | #endif | |
93642ef8 | 4378 | return 0; |
03b1230c JA |
4379 | } |
4380 | ||
889fca73 | 4381 | static int io_sendmsg(struct io_kiocb *req, unsigned int issue_flags) |
aa1fa28f | 4382 | { |
6b754c8b | 4383 | struct io_async_msghdr iomsg, *kmsg; |
0fa03c62 | 4384 | struct socket *sock; |
7a7cacba | 4385 | unsigned flags; |
0031275d | 4386 | int min_ret = 0; |
0fa03c62 JA |
4387 | int ret; |
4388 | ||
dba4a925 | 4389 | sock = sock_from_file(req->file); |
7a7cacba | 4390 | if (unlikely(!sock)) |
dba4a925 | 4391 | return -ENOTSOCK; |
3529d8c2 | 4392 | |
257e84a5 PB |
4393 | kmsg = req->async_data; |
4394 | if (!kmsg) { | |
7a7cacba PB |
4395 | ret = io_sendmsg_copy_hdr(req, &iomsg); |
4396 | if (ret) | |
4397 | return ret; | |
4398 | kmsg = &iomsg; | |
0fa03c62 | 4399 | } |
0fa03c62 | 4400 | |
04411806 PB |
4401 | flags = req->sr_msg.msg_flags; |
4402 | if (issue_flags & IO_URING_F_NONBLOCK) | |
7a7cacba | 4403 | flags |= MSG_DONTWAIT; |
0031275d SM |
4404 | if (flags & MSG_WAITALL) |
4405 | min_ret = iov_iter_count(&kmsg->msg.msg_iter); | |
4406 | ||
7a7cacba | 4407 | ret = __sys_sendmsg_sock(sock, &kmsg->msg, flags); |
45d189c6 | 4408 | if ((issue_flags & IO_URING_F_NONBLOCK) && ret == -EAGAIN) |
7a7cacba PB |
4409 | return io_setup_async_msg(req, kmsg); |
4410 | if (ret == -ERESTARTSYS) | |
4411 | ret = -EINTR; | |
0fa03c62 | 4412 | |
257e84a5 PB |
4413 | /* fast path, check for non-NULL to avoid function call */ |
4414 | if (kmsg->free_iov) | |
4415 | kfree(kmsg->free_iov); | |
99bc4c38 | 4416 | req->flags &= ~REQ_F_NEED_CLEANUP; |
0031275d | 4417 | if (ret < min_ret) |
93d2bcd2 | 4418 | req_set_fail(req); |
889fca73 | 4419 | __io_req_complete(req, issue_flags, ret, 0); |
5d17b4a4 | 4420 | return 0; |
03b1230c | 4421 | } |
aa1fa28f | 4422 | |
889fca73 | 4423 | static int io_send(struct io_kiocb *req, unsigned int issue_flags) |
fddaface | 4424 | { |
7a7cacba PB |
4425 | struct io_sr_msg *sr = &req->sr_msg; |
4426 | struct msghdr msg; | |
4427 | struct iovec iov; | |
fddaface | 4428 | struct socket *sock; |
7a7cacba | 4429 | unsigned flags; |
0031275d | 4430 | int min_ret = 0; |
fddaface JA |
4431 | int ret; |
4432 | ||
dba4a925 | 4433 | sock = sock_from_file(req->file); |
7a7cacba | 4434 | if (unlikely(!sock)) |
dba4a925 | 4435 | return -ENOTSOCK; |
fddaface | 4436 | |
7a7cacba PB |
4437 | ret = import_single_range(WRITE, sr->buf, sr->len, &iov, &msg.msg_iter); |
4438 | if (unlikely(ret)) | |
14db8411 | 4439 | return ret; |
fddaface | 4440 | |
7a7cacba PB |
4441 | msg.msg_name = NULL; |
4442 | msg.msg_control = NULL; | |
4443 | msg.msg_controllen = 0; | |
4444 | msg.msg_namelen = 0; | |
fddaface | 4445 | |
04411806 PB |
4446 | flags = req->sr_msg.msg_flags; |
4447 | if (issue_flags & IO_URING_F_NONBLOCK) | |
7a7cacba | 4448 | flags |= MSG_DONTWAIT; |
0031275d SM |
4449 | if (flags & MSG_WAITALL) |
4450 | min_ret = iov_iter_count(&msg.msg_iter); | |
4451 | ||
7a7cacba PB |
4452 | msg.msg_flags = flags; |
4453 | ret = sock_sendmsg(sock, &msg); | |
45d189c6 | 4454 | if ((issue_flags & IO_URING_F_NONBLOCK) && ret == -EAGAIN) |
7a7cacba PB |
4455 | return -EAGAIN; |
4456 | if (ret == -ERESTARTSYS) | |
4457 | ret = -EINTR; | |
fddaface | 4458 | |
0031275d | 4459 | if (ret < min_ret) |
93d2bcd2 | 4460 | req_set_fail(req); |
889fca73 | 4461 | __io_req_complete(req, issue_flags, ret, 0); |
fddaface | 4462 | return 0; |
fddaface JA |
4463 | } |
4464 | ||
1400e697 PB |
4465 | static int __io_recvmsg_copy_hdr(struct io_kiocb *req, |
4466 | struct io_async_msghdr *iomsg) | |
52de1fe1 JA |
4467 | { |
4468 | struct io_sr_msg *sr = &req->sr_msg; | |
4469 | struct iovec __user *uiov; | |
4470 | size_t iov_len; | |
4471 | int ret; | |
4472 | ||
1400e697 PB |
4473 | ret = __copy_msghdr_from_user(&iomsg->msg, sr->umsg, |
4474 | &iomsg->uaddr, &uiov, &iov_len); | |
52de1fe1 JA |
4475 | if (ret) |
4476 | return ret; | |
4477 | ||
4478 | if (req->flags & REQ_F_BUFFER_SELECT) { | |
4479 | if (iov_len > 1) | |
4480 | return -EINVAL; | |
5476dfed | 4481 | if (copy_from_user(iomsg->fast_iov, uiov, sizeof(*uiov))) |
52de1fe1 | 4482 | return -EFAULT; |
5476dfed | 4483 | sr->len = iomsg->fast_iov[0].iov_len; |
257e84a5 | 4484 | iomsg->free_iov = NULL; |
52de1fe1 | 4485 | } else { |
257e84a5 | 4486 | iomsg->free_iov = iomsg->fast_iov; |
89cd35c5 | 4487 | ret = __import_iovec(READ, uiov, iov_len, UIO_FASTIOV, |
257e84a5 | 4488 | &iomsg->free_iov, &iomsg->msg.msg_iter, |
89cd35c5 | 4489 | false); |
52de1fe1 JA |
4490 | if (ret > 0) |
4491 | ret = 0; | |
4492 | } | |
4493 | ||
4494 | return ret; | |
4495 | } | |
4496 | ||
4497 | #ifdef CONFIG_COMPAT | |
4498 | static int __io_compat_recvmsg_copy_hdr(struct io_kiocb *req, | |
1400e697 | 4499 | struct io_async_msghdr *iomsg) |
52de1fe1 | 4500 | { |
52de1fe1 JA |
4501 | struct io_sr_msg *sr = &req->sr_msg; |
4502 | struct compat_iovec __user *uiov; | |
4503 | compat_uptr_t ptr; | |
4504 | compat_size_t len; | |
4505 | int ret; | |
4506 | ||
4af3417a PB |
4507 | ret = __get_compat_msghdr(&iomsg->msg, sr->umsg_compat, &iomsg->uaddr, |
4508 | &ptr, &len); | |
52de1fe1 JA |
4509 | if (ret) |
4510 | return ret; | |
4511 | ||
4512 | uiov = compat_ptr(ptr); | |
4513 | if (req->flags & REQ_F_BUFFER_SELECT) { | |
4514 | compat_ssize_t clen; | |
4515 | ||
4516 | if (len > 1) | |
4517 | return -EINVAL; | |
4518 | if (!access_ok(uiov, sizeof(*uiov))) | |
4519 | return -EFAULT; | |
4520 | if (__get_user(clen, &uiov->iov_len)) | |
4521 | return -EFAULT; | |
4522 | if (clen < 0) | |
4523 | return -EINVAL; | |
2d280bc8 | 4524 | sr->len = clen; |
257e84a5 | 4525 | iomsg->free_iov = NULL; |
52de1fe1 | 4526 | } else { |
257e84a5 | 4527 | iomsg->free_iov = iomsg->fast_iov; |
89cd35c5 | 4528 | ret = __import_iovec(READ, (struct iovec __user *)uiov, len, |
257e84a5 | 4529 | UIO_FASTIOV, &iomsg->free_iov, |
89cd35c5 | 4530 | &iomsg->msg.msg_iter, true); |
52de1fe1 JA |
4531 | if (ret < 0) |
4532 | return ret; | |
4533 | } | |
4534 | ||
4535 | return 0; | |
4536 | } | |
4537 | #endif | |
4538 | ||
1400e697 PB |
4539 | static int io_recvmsg_copy_hdr(struct io_kiocb *req, |
4540 | struct io_async_msghdr *iomsg) | |
52de1fe1 | 4541 | { |
1400e697 | 4542 | iomsg->msg.msg_name = &iomsg->addr; |
52de1fe1 JA |
4543 | |
4544 | #ifdef CONFIG_COMPAT | |
4545 | if (req->ctx->compat) | |
1400e697 | 4546 | return __io_compat_recvmsg_copy_hdr(req, iomsg); |
fddaface | 4547 | #endif |
52de1fe1 | 4548 | |
1400e697 | 4549 | return __io_recvmsg_copy_hdr(req, iomsg); |
52de1fe1 JA |
4550 | } |
4551 | ||
bcda7baa | 4552 | static struct io_buffer *io_recv_buffer_select(struct io_kiocb *req, |
7fbb1b54 | 4553 | bool needs_lock) |
bcda7baa JA |
4554 | { |
4555 | struct io_sr_msg *sr = &req->sr_msg; | |
4556 | struct io_buffer *kbuf; | |
4557 | ||
bcda7baa JA |
4558 | kbuf = io_buffer_select(req, &sr->len, sr->bgid, sr->kbuf, needs_lock); |
4559 | if (IS_ERR(kbuf)) | |
4560 | return kbuf; | |
4561 | ||
4562 | sr->kbuf = kbuf; | |
4563 | req->flags |= REQ_F_BUFFER_SELECTED; | |
bcda7baa | 4564 | return kbuf; |
fddaface JA |
4565 | } |
4566 | ||
7fbb1b54 PB |
4567 | static inline unsigned int io_put_recv_kbuf(struct io_kiocb *req) |
4568 | { | |
4569 | return io_put_kbuf(req, req->sr_msg.kbuf); | |
4570 | } | |
4571 | ||
93642ef8 | 4572 | static int io_recvmsg_prep_async(struct io_kiocb *req) |
aa1fa28f | 4573 | { |
99bc4c38 | 4574 | int ret; |
3529d8c2 | 4575 | |
93642ef8 PB |
4576 | ret = io_recvmsg_copy_hdr(req, req->async_data); |
4577 | if (!ret) | |
4578 | req->flags |= REQ_F_NEED_CLEANUP; | |
4579 | return ret; | |
4580 | } | |
4581 | ||
4582 | static int io_recvmsg_prep(struct io_kiocb *req, const struct io_uring_sqe *sqe) | |
4583 | { | |
4584 | struct io_sr_msg *sr = &req->sr_msg; | |
4585 | ||
d2b6f48b PB |
4586 | if (unlikely(req->ctx->flags & IORING_SETUP_IOPOLL)) |
4587 | return -EINVAL; | |
4588 | ||
270a5940 | 4589 | sr->umsg = u64_to_user_ptr(READ_ONCE(sqe->addr)); |
0b7b21e4 | 4590 | sr->len = READ_ONCE(sqe->len); |
bcda7baa | 4591 | sr->bgid = READ_ONCE(sqe->buf_group); |
04411806 PB |
4592 | sr->msg_flags = READ_ONCE(sqe->msg_flags) | MSG_NOSIGNAL; |
4593 | if (sr->msg_flags & MSG_DONTWAIT) | |
4594 | req->flags |= REQ_F_NOWAIT; | |
06b76d44 | 4595 | |
d8768362 JA |
4596 | #ifdef CONFIG_COMPAT |
4597 | if (req->ctx->compat) | |
4598 | sr->msg_flags |= MSG_CMSG_COMPAT; | |
4599 | #endif | |
93642ef8 | 4600 | return 0; |
aa1fa28f JA |
4601 | } |
4602 | ||
889fca73 | 4603 | static int io_recvmsg(struct io_kiocb *req, unsigned int issue_flags) |
aa1fa28f | 4604 | { |
6b754c8b | 4605 | struct io_async_msghdr iomsg, *kmsg; |
03b1230c | 4606 | struct socket *sock; |
7fbb1b54 | 4607 | struct io_buffer *kbuf; |
7a7cacba | 4608 | unsigned flags; |
0031275d | 4609 | int min_ret = 0; |
52de1fe1 | 4610 | int ret, cflags = 0; |
45d189c6 | 4611 | bool force_nonblock = issue_flags & IO_URING_F_NONBLOCK; |
03b1230c | 4612 | |
dba4a925 | 4613 | sock = sock_from_file(req->file); |
7a7cacba | 4614 | if (unlikely(!sock)) |
dba4a925 | 4615 | return -ENOTSOCK; |
3529d8c2 | 4616 | |
257e84a5 PB |
4617 | kmsg = req->async_data; |
4618 | if (!kmsg) { | |
7a7cacba PB |
4619 | ret = io_recvmsg_copy_hdr(req, &iomsg); |
4620 | if (ret) | |
681fda8d | 4621 | return ret; |
7a7cacba PB |
4622 | kmsg = &iomsg; |
4623 | } | |
03b1230c | 4624 | |
bc02ef33 | 4625 | if (req->flags & REQ_F_BUFFER_SELECT) { |
7fbb1b54 | 4626 | kbuf = io_recv_buffer_select(req, !force_nonblock); |
bc02ef33 | 4627 | if (IS_ERR(kbuf)) |
52de1fe1 | 4628 | return PTR_ERR(kbuf); |
7a7cacba | 4629 | kmsg->fast_iov[0].iov_base = u64_to_user_ptr(kbuf->addr); |
5476dfed PB |
4630 | kmsg->fast_iov[0].iov_len = req->sr_msg.len; |
4631 | iov_iter_init(&kmsg->msg.msg_iter, READ, kmsg->fast_iov, | |
7a7cacba PB |
4632 | 1, req->sr_msg.len); |
4633 | } | |
52de1fe1 | 4634 | |
04411806 PB |
4635 | flags = req->sr_msg.msg_flags; |
4636 | if (force_nonblock) | |
7a7cacba | 4637 | flags |= MSG_DONTWAIT; |
0031275d SM |
4638 | if (flags & MSG_WAITALL) |
4639 | min_ret = iov_iter_count(&kmsg->msg.msg_iter); | |
4640 | ||
7a7cacba PB |
4641 | ret = __sys_recvmsg_sock(sock, &kmsg->msg, req->sr_msg.umsg, |
4642 | kmsg->uaddr, flags); | |
0e1b6fe3 PB |
4643 | if (force_nonblock && ret == -EAGAIN) |
4644 | return io_setup_async_msg(req, kmsg); | |
7a7cacba PB |
4645 | if (ret == -ERESTARTSYS) |
4646 | ret = -EINTR; | |
03b1230c | 4647 | |
7fbb1b54 PB |
4648 | if (req->flags & REQ_F_BUFFER_SELECTED) |
4649 | cflags = io_put_recv_kbuf(req); | |
257e84a5 PB |
4650 | /* fast path, check for non-NULL to avoid function call */ |
4651 | if (kmsg->free_iov) | |
4652 | kfree(kmsg->free_iov); | |
99bc4c38 | 4653 | req->flags &= ~REQ_F_NEED_CLEANUP; |
0031275d | 4654 | if (ret < min_ret || ((flags & MSG_WAITALL) && (kmsg->msg.msg_flags & (MSG_TRUNC | MSG_CTRUNC)))) |
93d2bcd2 | 4655 | req_set_fail(req); |
889fca73 | 4656 | __io_req_complete(req, issue_flags, ret, cflags); |
03b1230c | 4657 | return 0; |
0fa03c62 | 4658 | } |
5d17b4a4 | 4659 | |
889fca73 | 4660 | static int io_recv(struct io_kiocb *req, unsigned int issue_flags) |
fddaface | 4661 | { |
6b754c8b | 4662 | struct io_buffer *kbuf; |
7a7cacba PB |
4663 | struct io_sr_msg *sr = &req->sr_msg; |
4664 | struct msghdr msg; | |
4665 | void __user *buf = sr->buf; | |
fddaface | 4666 | struct socket *sock; |
7a7cacba PB |
4667 | struct iovec iov; |
4668 | unsigned flags; | |
0031275d | 4669 | int min_ret = 0; |
bcda7baa | 4670 | int ret, cflags = 0; |
45d189c6 | 4671 | bool force_nonblock = issue_flags & IO_URING_F_NONBLOCK; |
fddaface | 4672 | |
dba4a925 | 4673 | sock = sock_from_file(req->file); |
7a7cacba | 4674 | if (unlikely(!sock)) |
dba4a925 | 4675 | return -ENOTSOCK; |
fddaface | 4676 | |
bc02ef33 | 4677 | if (req->flags & REQ_F_BUFFER_SELECT) { |
7fbb1b54 | 4678 | kbuf = io_recv_buffer_select(req, !force_nonblock); |
bcda7baa JA |
4679 | if (IS_ERR(kbuf)) |
4680 | return PTR_ERR(kbuf); | |
7a7cacba | 4681 | buf = u64_to_user_ptr(kbuf->addr); |
bc02ef33 | 4682 | } |
bcda7baa | 4683 | |
7a7cacba | 4684 | ret = import_single_range(READ, buf, sr->len, &iov, &msg.msg_iter); |
14c32eee PB |
4685 | if (unlikely(ret)) |
4686 | goto out_free; | |
fddaface | 4687 | |
7a7cacba PB |
4688 | msg.msg_name = NULL; |
4689 | msg.msg_control = NULL; | |
4690 | msg.msg_controllen = 0; | |
4691 | msg.msg_namelen = 0; | |
4692 | msg.msg_iocb = NULL; | |
4693 | msg.msg_flags = 0; | |
fddaface | 4694 | |
04411806 PB |
4695 | flags = req->sr_msg.msg_flags; |
4696 | if (force_nonblock) | |
7a7cacba | 4697 | flags |= MSG_DONTWAIT; |
0031275d SM |
4698 | if (flags & MSG_WAITALL) |
4699 | min_ret = iov_iter_count(&msg.msg_iter); | |
4700 | ||
7a7cacba PB |
4701 | ret = sock_recvmsg(sock, &msg, flags); |
4702 | if (force_nonblock && ret == -EAGAIN) | |
4703 | return -EAGAIN; | |
4704 | if (ret == -ERESTARTSYS) | |
4705 | ret = -EINTR; | |
14c32eee | 4706 | out_free: |
7fbb1b54 PB |
4707 | if (req->flags & REQ_F_BUFFER_SELECTED) |
4708 | cflags = io_put_recv_kbuf(req); | |
0031275d | 4709 | if (ret < min_ret || ((flags & MSG_WAITALL) && (msg.msg_flags & (MSG_TRUNC | MSG_CTRUNC)))) |
93d2bcd2 | 4710 | req_set_fail(req); |
889fca73 | 4711 | __io_req_complete(req, issue_flags, ret, cflags); |
fddaface | 4712 | return 0; |
fddaface JA |
4713 | } |
4714 | ||
3529d8c2 | 4715 | static int io_accept_prep(struct io_kiocb *req, const struct io_uring_sqe *sqe) |
17f2fe35 | 4716 | { |
8ed8d3c3 JA |
4717 | struct io_accept *accept = &req->accept; |
4718 | ||
14587a46 | 4719 | if (unlikely(req->ctx->flags & IORING_SETUP_IOPOLL)) |
17f2fe35 | 4720 | return -EINVAL; |
8042d6ce | 4721 | if (sqe->ioprio || sqe->len || sqe->buf_index) |
17f2fe35 JA |
4722 | return -EINVAL; |
4723 | ||
d55e5f5b JA |
4724 | accept->addr = u64_to_user_ptr(READ_ONCE(sqe->addr)); |
4725 | accept->addr_len = u64_to_user_ptr(READ_ONCE(sqe->addr2)); | |
8ed8d3c3 | 4726 | accept->flags = READ_ONCE(sqe->accept_flags); |
09952e3e | 4727 | accept->nofile = rlimit(RLIMIT_NOFILE); |
8ed8d3c3 | 4728 | return 0; |
8ed8d3c3 | 4729 | } |
17f2fe35 | 4730 | |
889fca73 | 4731 | static int io_accept(struct io_kiocb *req, unsigned int issue_flags) |
8ed8d3c3 JA |
4732 | { |
4733 | struct io_accept *accept = &req->accept; | |
45d189c6 | 4734 | bool force_nonblock = issue_flags & IO_URING_F_NONBLOCK; |
ac45abc0 | 4735 | unsigned int file_flags = force_nonblock ? O_NONBLOCK : 0; |
8ed8d3c3 JA |
4736 | int ret; |
4737 | ||
e697deed JX |
4738 | if (req->file->f_flags & O_NONBLOCK) |
4739 | req->flags |= REQ_F_NOWAIT; | |
4740 | ||
8ed8d3c3 | 4741 | ret = __sys_accept4_file(req->file, file_flags, accept->addr, |
09952e3e JA |
4742 | accept->addr_len, accept->flags, |
4743 | accept->nofile); | |
8ed8d3c3 | 4744 | if (ret == -EAGAIN && force_nonblock) |
17f2fe35 | 4745 | return -EAGAIN; |
ac45abc0 PB |
4746 | if (ret < 0) { |
4747 | if (ret == -ERESTARTSYS) | |
4748 | ret = -EINTR; | |
93d2bcd2 | 4749 | req_set_fail(req); |
ac45abc0 | 4750 | } |
889fca73 | 4751 | __io_req_complete(req, issue_flags, ret, 0); |
17f2fe35 | 4752 | return 0; |
8ed8d3c3 JA |
4753 | } |
4754 | ||
93642ef8 PB |
4755 | static int io_connect_prep_async(struct io_kiocb *req) |
4756 | { | |
4757 | struct io_async_connect *io = req->async_data; | |
4758 | struct io_connect *conn = &req->connect; | |
4759 | ||
4760 | return move_addr_to_kernel(conn->addr, conn->addr_len, &io->address); | |
4761 | } | |
4762 | ||
3529d8c2 | 4763 | static int io_connect_prep(struct io_kiocb *req, const struct io_uring_sqe *sqe) |
f499a021 | 4764 | { |
3529d8c2 | 4765 | struct io_connect *conn = &req->connect; |
f499a021 | 4766 | |
14587a46 | 4767 | if (unlikely(req->ctx->flags & IORING_SETUP_IOPOLL)) |
3fbb51c1 JA |
4768 | return -EINVAL; |
4769 | if (sqe->ioprio || sqe->len || sqe->buf_index || sqe->rw_flags) | |
4770 | return -EINVAL; | |
4771 | ||
3529d8c2 JA |
4772 | conn->addr = u64_to_user_ptr(READ_ONCE(sqe->addr)); |
4773 | conn->addr_len = READ_ONCE(sqe->addr2); | |
93642ef8 | 4774 | return 0; |
f499a021 JA |
4775 | } |
4776 | ||
889fca73 | 4777 | static int io_connect(struct io_kiocb *req, unsigned int issue_flags) |
f8e85cf2 | 4778 | { |
e8c2bc1f | 4779 | struct io_async_connect __io, *io; |
f8e85cf2 | 4780 | unsigned file_flags; |
3fbb51c1 | 4781 | int ret; |
45d189c6 | 4782 | bool force_nonblock = issue_flags & IO_URING_F_NONBLOCK; |
f8e85cf2 | 4783 | |
e8c2bc1f JA |
4784 | if (req->async_data) { |
4785 | io = req->async_data; | |
f499a021 | 4786 | } else { |
3529d8c2 JA |
4787 | ret = move_addr_to_kernel(req->connect.addr, |
4788 | req->connect.addr_len, | |
e8c2bc1f | 4789 | &__io.address); |
f499a021 JA |
4790 | if (ret) |
4791 | goto out; | |
4792 | io = &__io; | |
4793 | } | |
4794 | ||
3fbb51c1 JA |
4795 | file_flags = force_nonblock ? O_NONBLOCK : 0; |
4796 | ||
e8c2bc1f | 4797 | ret = __sys_connect_file(req->file, &io->address, |
3fbb51c1 | 4798 | req->connect.addr_len, file_flags); |
87f80d62 | 4799 | if ((ret == -EAGAIN || ret == -EINPROGRESS) && force_nonblock) { |
e8c2bc1f | 4800 | if (req->async_data) |
b7bb4f7d | 4801 | return -EAGAIN; |
e8c2bc1f | 4802 | if (io_alloc_async_data(req)) { |
f499a021 JA |
4803 | ret = -ENOMEM; |
4804 | goto out; | |
4805 | } | |
e8c2bc1f | 4806 | memcpy(req->async_data, &__io, sizeof(__io)); |
f8e85cf2 | 4807 | return -EAGAIN; |
f499a021 | 4808 | } |
f8e85cf2 JA |
4809 | if (ret == -ERESTARTSYS) |
4810 | ret = -EINTR; | |
f499a021 | 4811 | out: |
4e88d6e7 | 4812 | if (ret < 0) |
93d2bcd2 | 4813 | req_set_fail(req); |
889fca73 | 4814 | __io_req_complete(req, issue_flags, ret, 0); |
f8e85cf2 | 4815 | return 0; |
469956e8 Y |
4816 | } |
4817 | #else /* !CONFIG_NET */ | |
99a10081 JA |
4818 | #define IO_NETOP_FN(op) \ |
4819 | static int io_##op(struct io_kiocb *req, unsigned int issue_flags) \ | |
4820 | { \ | |
4821 | return -EOPNOTSUPP; \ | |
4822 | } | |
4823 | ||
4824 | #define IO_NETOP_PREP(op) \ | |
4825 | IO_NETOP_FN(op) \ | |
4826 | static int io_##op##_prep(struct io_kiocb *req, const struct io_uring_sqe *sqe) \ | |
4827 | { \ | |
4828 | return -EOPNOTSUPP; \ | |
4829 | } \ | |
4830 | ||
4831 | #define IO_NETOP_PREP_ASYNC(op) \ | |
4832 | IO_NETOP_PREP(op) \ | |
4833 | static int io_##op##_prep_async(struct io_kiocb *req) \ | |
4834 | { \ | |
4835 | return -EOPNOTSUPP; \ | |
4836 | } | |
4837 | ||
4838 | IO_NETOP_PREP_ASYNC(sendmsg); | |
4839 | IO_NETOP_PREP_ASYNC(recvmsg); | |
4840 | IO_NETOP_PREP_ASYNC(connect); | |
4841 | IO_NETOP_PREP(accept); | |
4842 | IO_NETOP_FN(send); | |
4843 | IO_NETOP_FN(recv); | |
469956e8 | 4844 | #endif /* CONFIG_NET */ |
f8e85cf2 | 4845 | |
d7718a9d JA |
4846 | struct io_poll_table { |
4847 | struct poll_table_struct pt; | |
4848 | struct io_kiocb *req; | |
68b11e8b | 4849 | int nr_entries; |
d7718a9d JA |
4850 | int error; |
4851 | }; | |
ce593a6c | 4852 | |
d7718a9d | 4853 | static int __io_async_wake(struct io_kiocb *req, struct io_poll_iocb *poll, |
5b0a6acc | 4854 | __poll_t mask, io_req_tw_func_t func) |
d7718a9d | 4855 | { |
d7718a9d JA |
4856 | /* for instances that support it check for an event match first: */ |
4857 | if (mask && !(mask & poll->events)) | |
4858 | return 0; | |
4859 | ||
4860 | trace_io_uring_task_add(req->ctx, req->opcode, req->user_data, mask); | |
4861 | ||
4862 | list_del_init(&poll->wait.entry); | |
4863 | ||
d7718a9d | 4864 | req->result = mask; |
5b0a6acc | 4865 | req->io_task_work.func = func; |
6d816e08 | 4866 | |
d7718a9d | 4867 | /* |
e3aabf95 JA |
4868 | * If this fails, then the task is exiting. When a task exits, the |
4869 | * work gets canceled, so just cancel this request as well instead | |
4870 | * of executing it. We can't safely execute it anyway, as we may not | |
4871 | * have the needed state needed for it anyway. | |
d7718a9d | 4872 | */ |
e09ee510 | 4873 | io_req_task_work_add(req); |
d7718a9d JA |
4874 | return 1; |
4875 | } | |
4876 | ||
74ce6ce4 JA |
4877 | static bool io_poll_rewait(struct io_kiocb *req, struct io_poll_iocb *poll) |
4878 | __acquires(&req->ctx->completion_lock) | |
4879 | { | |
4880 | struct io_ring_ctx *ctx = req->ctx; | |
4881 | ||
e09ee510 PB |
4882 | if (unlikely(req->task->flags & PF_EXITING)) |
4883 | WRITE_ONCE(poll->canceled, true); | |
4884 | ||
74ce6ce4 JA |
4885 | if (!req->result && !READ_ONCE(poll->canceled)) { |
4886 | struct poll_table_struct pt = { ._key = poll->events }; | |
4887 | ||
4888 | req->result = vfs_poll(req->file, &pt) & poll->events; | |
4889 | } | |
4890 | ||
4891 | spin_lock_irq(&ctx->completion_lock); | |
4892 | if (!req->result && !READ_ONCE(poll->canceled)) { | |
4893 | add_wait_queue(poll->head, &poll->wait); | |
4894 | return true; | |
4895 | } | |
4896 | ||
4897 | return false; | |
4898 | } | |
4899 | ||
d4e7cd36 | 4900 | static struct io_poll_iocb *io_poll_get_double(struct io_kiocb *req) |
18bceab1 | 4901 | { |
e8c2bc1f | 4902 | /* pure poll stashes this in ->async_data, poll driven retry elsewhere */ |
d4e7cd36 | 4903 | if (req->opcode == IORING_OP_POLL_ADD) |
e8c2bc1f | 4904 | return req->async_data; |
d4e7cd36 JA |
4905 | return req->apoll->double_poll; |
4906 | } | |
4907 | ||
4908 | static struct io_poll_iocb *io_poll_get_single(struct io_kiocb *req) | |
4909 | { | |
4910 | if (req->opcode == IORING_OP_POLL_ADD) | |
4911 | return &req->poll; | |
4912 | return &req->apoll->poll; | |
4913 | } | |
4914 | ||
4915 | static void io_poll_remove_double(struct io_kiocb *req) | |
e07785b0 | 4916 | __must_hold(&req->ctx->completion_lock) |
d4e7cd36 JA |
4917 | { |
4918 | struct io_poll_iocb *poll = io_poll_get_double(req); | |
18bceab1 JA |
4919 | |
4920 | lockdep_assert_held(&req->ctx->completion_lock); | |
4921 | ||
4922 | if (poll && poll->head) { | |
4923 | struct wait_queue_head *head = poll->head; | |
4924 | ||
4925 | spin_lock(&head->lock); | |
4926 | list_del_init(&poll->wait.entry); | |
4927 | if (poll->wait.private) | |
de9b4cca | 4928 | req_ref_put(req); |
18bceab1 JA |
4929 | poll->head = NULL; |
4930 | spin_unlock(&head->lock); | |
4931 | } | |
4932 | } | |
4933 | ||
e27414be | 4934 | static bool io_poll_complete(struct io_kiocb *req, __poll_t mask) |
e07785b0 | 4935 | __must_hold(&req->ctx->completion_lock) |
18bceab1 JA |
4936 | { |
4937 | struct io_ring_ctx *ctx = req->ctx; | |
88e41cf9 | 4938 | unsigned flags = IORING_CQE_F_MORE; |
e27414be | 4939 | int error; |
18bceab1 | 4940 | |
e27414be | 4941 | if (READ_ONCE(req->poll.canceled)) { |
45ab03b1 | 4942 | error = -ECANCELED; |
88e41cf9 | 4943 | req->poll.events |= EPOLLONESHOT; |
e27414be | 4944 | } else { |
5082620f | 4945 | error = mangle_poll(mask); |
e27414be | 4946 | } |
b69de288 JA |
4947 | if (req->poll.events & EPOLLONESHOT) |
4948 | flags = 0; | |
d4d19c19 | 4949 | if (!io_cqring_fill_event(ctx, req->user_data, error, flags)) { |
88e41cf9 JA |
4950 | req->poll.done = true; |
4951 | flags = 0; | |
4952 | } | |
7b289c38 HX |
4953 | if (flags & IORING_CQE_F_MORE) |
4954 | ctx->cq_extra++; | |
18bceab1 | 4955 | |
18bceab1 | 4956 | io_commit_cqring(ctx); |
88e41cf9 | 4957 | return !(flags & IORING_CQE_F_MORE); |
18bceab1 JA |
4958 | } |
4959 | ||
5b0a6acc | 4960 | static void io_poll_task_func(struct io_kiocb *req) |
18bceab1 JA |
4961 | { |
4962 | struct io_ring_ctx *ctx = req->ctx; | |
dd221f46 | 4963 | struct io_kiocb *nxt; |
18bceab1 JA |
4964 | |
4965 | if (io_poll_rewait(req, &req->poll)) { | |
4966 | spin_unlock_irq(&ctx->completion_lock); | |
dd221f46 | 4967 | } else { |
f40b964a | 4968 | bool done; |
18bceab1 | 4969 | |
e27414be | 4970 | done = io_poll_complete(req, req->result); |
88e41cf9 | 4971 | if (done) { |
a890d01e | 4972 | io_poll_remove_double(req); |
88e41cf9 | 4973 | hash_del(&req->hash_node); |
f40b964a | 4974 | } else { |
88e41cf9 JA |
4975 | req->result = 0; |
4976 | add_wait_queue(req->poll.head, &req->poll.wait); | |
4977 | } | |
dd221f46 | 4978 | spin_unlock_irq(&ctx->completion_lock); |
dd221f46 | 4979 | io_cqring_ev_posted(ctx); |
18bceab1 | 4980 | |
88e41cf9 JA |
4981 | if (done) { |
4982 | nxt = io_put_req_find_next(req); | |
4983 | if (nxt) | |
5b0a6acc | 4984 | io_req_task_submit(nxt); |
88e41cf9 | 4985 | } |
dd221f46 | 4986 | } |
18bceab1 JA |
4987 | } |
4988 | ||
4989 | static int io_poll_double_wake(struct wait_queue_entry *wait, unsigned mode, | |
4990 | int sync, void *key) | |
4991 | { | |
4992 | struct io_kiocb *req = wait->private; | |
d4e7cd36 | 4993 | struct io_poll_iocb *poll = io_poll_get_single(req); |
18bceab1 JA |
4994 | __poll_t mask = key_to_poll(key); |
4995 | ||
4996 | /* for instances that support it check for an event match first: */ | |
4997 | if (mask && !(mask & poll->events)) | |
4998 | return 0; | |
88e41cf9 JA |
4999 | if (!(poll->events & EPOLLONESHOT)) |
5000 | return poll->wait.func(&poll->wait, mode, sync, key); | |
18bceab1 | 5001 | |
8706e04e JA |
5002 | list_del_init(&wait->entry); |
5003 | ||
9ce85ef2 | 5004 | if (poll->head) { |
18bceab1 JA |
5005 | bool done; |
5006 | ||
807abcb0 JA |
5007 | spin_lock(&poll->head->lock); |
5008 | done = list_empty(&poll->wait.entry); | |
18bceab1 | 5009 | if (!done) |
807abcb0 | 5010 | list_del_init(&poll->wait.entry); |
d4e7cd36 JA |
5011 | /* make sure double remove sees this as being gone */ |
5012 | wait->private = NULL; | |
807abcb0 | 5013 | spin_unlock(&poll->head->lock); |
c8b5e260 JA |
5014 | if (!done) { |
5015 | /* use wait func handler, so it matches the rq type */ | |
5016 | poll->wait.func(&poll->wait, mode, sync, key); | |
5017 | } | |
18bceab1 | 5018 | } |
de9b4cca | 5019 | req_ref_put(req); |
18bceab1 JA |
5020 | return 1; |
5021 | } | |
5022 | ||
5023 | static void io_init_poll_iocb(struct io_poll_iocb *poll, __poll_t events, | |
5024 | wait_queue_func_t wake_func) | |
5025 | { | |
5026 | poll->head = NULL; | |
5027 | poll->done = false; | |
5028 | poll->canceled = false; | |
464dca61 JA |
5029 | #define IO_POLL_UNMASK (EPOLLERR|EPOLLHUP|EPOLLNVAL|EPOLLRDHUP) |
5030 | /* mask in events that we always want/need */ | |
5031 | poll->events = events | IO_POLL_UNMASK; | |
18bceab1 JA |
5032 | INIT_LIST_HEAD(&poll->wait.entry); |
5033 | init_waitqueue_func_entry(&poll->wait, wake_func); | |
5034 | } | |
5035 | ||
5036 | static void __io_queue_proc(struct io_poll_iocb *poll, struct io_poll_table *pt, | |
807abcb0 JA |
5037 | struct wait_queue_head *head, |
5038 | struct io_poll_iocb **poll_ptr) | |
18bceab1 JA |
5039 | { |
5040 | struct io_kiocb *req = pt->req; | |
5041 | ||
5042 | /* | |
68b11e8b PB |
5043 | * The file being polled uses multiple waitqueues for poll handling |
5044 | * (e.g. one for read, one for write). Setup a separate io_poll_iocb | |
5045 | * if this happens. | |
18bceab1 | 5046 | */ |
68b11e8b | 5047 | if (unlikely(pt->nr_entries)) { |
58852d4d PB |
5048 | struct io_poll_iocb *poll_one = poll; |
5049 | ||
18bceab1 | 5050 | /* already have a 2nd entry, fail a third attempt */ |
807abcb0 | 5051 | if (*poll_ptr) { |
18bceab1 JA |
5052 | pt->error = -EINVAL; |
5053 | return; | |
5054 | } | |
ea6a693d JA |
5055 | /* |
5056 | * Can't handle multishot for double wait for now, turn it | |
5057 | * into one-shot mode. | |
5058 | */ | |
7a274727 PB |
5059 | if (!(poll_one->events & EPOLLONESHOT)) |
5060 | poll_one->events |= EPOLLONESHOT; | |
1c3b3e65 | 5061 | /* double add on the same waitqueue head, ignore */ |
7a274727 | 5062 | if (poll_one->head == head) |
1c3b3e65 | 5063 | return; |
18bceab1 JA |
5064 | poll = kmalloc(sizeof(*poll), GFP_ATOMIC); |
5065 | if (!poll) { | |
5066 | pt->error = -ENOMEM; | |
5067 | return; | |
5068 | } | |
58852d4d | 5069 | io_init_poll_iocb(poll, poll_one->events, io_poll_double_wake); |
de9b4cca | 5070 | req_ref_get(req); |
18bceab1 | 5071 | poll->wait.private = req; |
807abcb0 | 5072 | *poll_ptr = poll; |
18bceab1 JA |
5073 | } |
5074 | ||
68b11e8b | 5075 | pt->nr_entries++; |
18bceab1 | 5076 | poll->head = head; |
a31eb4a2 JX |
5077 | |
5078 | if (poll->events & EPOLLEXCLUSIVE) | |
5079 | add_wait_queue_exclusive(head, &poll->wait); | |
5080 | else | |
5081 | add_wait_queue(head, &poll->wait); | |
18bceab1 JA |
5082 | } |
5083 | ||
5084 | static void io_async_queue_proc(struct file *file, struct wait_queue_head *head, | |
5085 | struct poll_table_struct *p) | |
5086 | { | |
5087 | struct io_poll_table *pt = container_of(p, struct io_poll_table, pt); | |
807abcb0 | 5088 | struct async_poll *apoll = pt->req->apoll; |
18bceab1 | 5089 | |
807abcb0 | 5090 | __io_queue_proc(&apoll->poll, pt, head, &apoll->double_poll); |
18bceab1 JA |
5091 | } |
5092 | ||
5b0a6acc | 5093 | static void io_async_task_func(struct io_kiocb *req) |
d7718a9d | 5094 | { |
d7718a9d JA |
5095 | struct async_poll *apoll = req->apoll; |
5096 | struct io_ring_ctx *ctx = req->ctx; | |
5097 | ||
236daeae | 5098 | trace_io_uring_task_run(req->ctx, req, req->opcode, req->user_data); |
d7718a9d | 5099 | |
74ce6ce4 | 5100 | if (io_poll_rewait(req, &apoll->poll)) { |
d7718a9d | 5101 | spin_unlock_irq(&ctx->completion_lock); |
74ce6ce4 | 5102 | return; |
d7718a9d JA |
5103 | } |
5104 | ||
0ea13b44 | 5105 | hash_del(&req->hash_node); |
d4e7cd36 | 5106 | io_poll_remove_double(req); |
74ce6ce4 JA |
5107 | spin_unlock_irq(&ctx->completion_lock); |
5108 | ||
0be0b0e3 | 5109 | if (!READ_ONCE(apoll->poll.canceled)) |
5b0a6acc | 5110 | io_req_task_submit(req); |
0be0b0e3 | 5111 | else |
2593553a | 5112 | io_req_complete_failed(req, -ECANCELED); |
d7718a9d JA |
5113 | } |
5114 | ||
5115 | static int io_async_wake(struct wait_queue_entry *wait, unsigned mode, int sync, | |
5116 | void *key) | |
5117 | { | |
5118 | struct io_kiocb *req = wait->private; | |
5119 | struct io_poll_iocb *poll = &req->apoll->poll; | |
5120 | ||
5121 | trace_io_uring_poll_wake(req->ctx, req->opcode, req->user_data, | |
5122 | key_to_poll(key)); | |
5123 | ||
5124 | return __io_async_wake(req, poll, key_to_poll(key), io_async_task_func); | |
5125 | } | |
5126 | ||
5127 | static void io_poll_req_insert(struct io_kiocb *req) | |
5128 | { | |
5129 | struct io_ring_ctx *ctx = req->ctx; | |
5130 | struct hlist_head *list; | |
5131 | ||
5132 | list = &ctx->cancel_hash[hash_long(req->user_data, ctx->cancel_hash_bits)]; | |
5133 | hlist_add_head(&req->hash_node, list); | |
5134 | } | |
5135 | ||
5136 | static __poll_t __io_arm_poll_handler(struct io_kiocb *req, | |
5137 | struct io_poll_iocb *poll, | |
5138 | struct io_poll_table *ipt, __poll_t mask, | |
5139 | wait_queue_func_t wake_func) | |
5140 | __acquires(&ctx->completion_lock) | |
5141 | { | |
5142 | struct io_ring_ctx *ctx = req->ctx; | |
5143 | bool cancel = false; | |
5144 | ||
4d52f338 | 5145 | INIT_HLIST_NODE(&req->hash_node); |
18bceab1 | 5146 | io_init_poll_iocb(poll, mask, wake_func); |
b90cd197 | 5147 | poll->file = req->file; |
18bceab1 | 5148 | poll->wait.private = req; |
d7718a9d JA |
5149 | |
5150 | ipt->pt._key = mask; | |
5151 | ipt->req = req; | |
68b11e8b PB |
5152 | ipt->error = 0; |
5153 | ipt->nr_entries = 0; | |
d7718a9d | 5154 | |
d7718a9d | 5155 | mask = vfs_poll(req->file, &ipt->pt) & poll->events; |
68b11e8b PB |
5156 | if (unlikely(!ipt->nr_entries) && !ipt->error) |
5157 | ipt->error = -EINVAL; | |
d7718a9d JA |
5158 | |
5159 | spin_lock_irq(&ctx->completion_lock); | |
a890d01e | 5160 | if (ipt->error || (mask && (poll->events & EPOLLONESHOT))) |
46fee9ab | 5161 | io_poll_remove_double(req); |
d7718a9d JA |
5162 | if (likely(poll->head)) { |
5163 | spin_lock(&poll->head->lock); | |
5164 | if (unlikely(list_empty(&poll->wait.entry))) { | |
5165 | if (ipt->error) | |
5166 | cancel = true; | |
5167 | ipt->error = 0; | |
5168 | mask = 0; | |
5169 | } | |
88e41cf9 | 5170 | if ((mask && (poll->events & EPOLLONESHOT)) || ipt->error) |
d7718a9d JA |
5171 | list_del_init(&poll->wait.entry); |
5172 | else if (cancel) | |
5173 | WRITE_ONCE(poll->canceled, true); | |
5174 | else if (!poll->done) /* actually waiting for an event */ | |
5175 | io_poll_req_insert(req); | |
5176 | spin_unlock(&poll->head->lock); | |
5177 | } | |
5178 | ||
5179 | return mask; | |
5180 | } | |
5181 | ||
59b735ae OL |
5182 | enum { |
5183 | IO_APOLL_OK, | |
5184 | IO_APOLL_ABORTED, | |
5185 | IO_APOLL_READY | |
5186 | }; | |
5187 | ||
5188 | static int io_arm_poll_handler(struct io_kiocb *req) | |
d7718a9d JA |
5189 | { |
5190 | const struct io_op_def *def = &io_op_defs[req->opcode]; | |
5191 | struct io_ring_ctx *ctx = req->ctx; | |
5192 | struct async_poll *apoll; | |
5193 | struct io_poll_table ipt; | |
b2d9c3da | 5194 | __poll_t ret, mask = EPOLLONESHOT | POLLERR | POLLPRI; |
9dab14b8 | 5195 | int rw; |
d7718a9d JA |
5196 | |
5197 | if (!req->file || !file_can_poll(req->file)) | |
59b735ae | 5198 | return IO_APOLL_ABORTED; |
24c74678 | 5199 | if (req->flags & REQ_F_POLLED) |
59b735ae | 5200 | return IO_APOLL_ABORTED; |
b2d9c3da PB |
5201 | if (!def->pollin && !def->pollout) |
5202 | return IO_APOLL_ABORTED; | |
5203 | ||
5204 | if (def->pollin) { | |
9dab14b8 | 5205 | rw = READ; |
b2d9c3da PB |
5206 | mask |= POLLIN | POLLRDNORM; |
5207 | ||
5208 | /* If reading from MSG_ERRQUEUE using recvmsg, ignore POLLIN */ | |
5209 | if ((req->opcode == IORING_OP_RECVMSG) && | |
5210 | (req->sr_msg.msg_flags & MSG_ERRQUEUE)) | |
5211 | mask &= ~POLLIN; | |
5212 | } else { | |
9dab14b8 | 5213 | rw = WRITE; |
b2d9c3da PB |
5214 | mask |= POLLOUT | POLLWRNORM; |
5215 | } | |
5216 | ||
9dab14b8 | 5217 | /* if we can't nonblock try, then no point in arming a poll handler */ |
b191e2df | 5218 | if (!io_file_supports_nowait(req, rw)) |
59b735ae | 5219 | return IO_APOLL_ABORTED; |
d7718a9d JA |
5220 | |
5221 | apoll = kmalloc(sizeof(*apoll), GFP_ATOMIC); | |
5222 | if (unlikely(!apoll)) | |
59b735ae | 5223 | return IO_APOLL_ABORTED; |
807abcb0 | 5224 | apoll->double_poll = NULL; |
d7718a9d | 5225 | req->apoll = apoll; |
b2d9c3da | 5226 | req->flags |= REQ_F_POLLED; |
d7718a9d JA |
5227 | ipt.pt._qproc = io_async_queue_proc; |
5228 | ||
5229 | ret = __io_arm_poll_handler(req, &apoll->poll, &ipt, mask, | |
5230 | io_async_wake); | |
a36da65c | 5231 | if (ret || ipt.error) { |
d7718a9d | 5232 | spin_unlock_irq(&ctx->completion_lock); |
59b735ae OL |
5233 | if (ret) |
5234 | return IO_APOLL_READY; | |
5235 | return IO_APOLL_ABORTED; | |
d7718a9d JA |
5236 | } |
5237 | spin_unlock_irq(&ctx->completion_lock); | |
236daeae OL |
5238 | trace_io_uring_poll_arm(ctx, req, req->opcode, req->user_data, |
5239 | mask, apoll->poll.events); | |
59b735ae | 5240 | return IO_APOLL_OK; |
d7718a9d JA |
5241 | } |
5242 | ||
5243 | static bool __io_poll_remove_one(struct io_kiocb *req, | |
b2e720ac | 5244 | struct io_poll_iocb *poll, bool do_cancel) |
e07785b0 | 5245 | __must_hold(&req->ctx->completion_lock) |
221c5eb2 | 5246 | { |
b41e9852 | 5247 | bool do_complete = false; |
221c5eb2 | 5248 | |
5082620f JA |
5249 | if (!poll->head) |
5250 | return false; | |
221c5eb2 | 5251 | spin_lock(&poll->head->lock); |
b2e720ac JA |
5252 | if (do_cancel) |
5253 | WRITE_ONCE(poll->canceled, true); | |
392edb45 JA |
5254 | if (!list_empty(&poll->wait.entry)) { |
5255 | list_del_init(&poll->wait.entry); | |
b41e9852 | 5256 | do_complete = true; |
221c5eb2 JA |
5257 | } |
5258 | spin_unlock(&poll->head->lock); | |
3bfa5bcb | 5259 | hash_del(&req->hash_node); |
d7718a9d JA |
5260 | return do_complete; |
5261 | } | |
5262 | ||
b2c3f7e1 | 5263 | static bool io_poll_remove_waitqs(struct io_kiocb *req) |
e07785b0 | 5264 | __must_hold(&req->ctx->completion_lock) |
d7718a9d JA |
5265 | { |
5266 | bool do_complete; | |
5267 | ||
d4e7cd36 | 5268 | io_poll_remove_double(req); |
e31001a3 | 5269 | do_complete = __io_poll_remove_one(req, io_poll_get_single(req), true); |
d4e7cd36 | 5270 | |
e31001a3 | 5271 | if (req->opcode != IORING_OP_POLL_ADD && do_complete) { |
d7718a9d | 5272 | /* non-poll requests have submit ref still */ |
e31001a3 | 5273 | req_ref_put(req); |
b1f573bd | 5274 | } |
b2c3f7e1 JA |
5275 | return do_complete; |
5276 | } | |
5277 | ||
5278 | static bool io_poll_remove_one(struct io_kiocb *req) | |
e07785b0 | 5279 | __must_hold(&req->ctx->completion_lock) |
b2c3f7e1 JA |
5280 | { |
5281 | bool do_complete; | |
b1f573bd | 5282 | |
b2c3f7e1 | 5283 | do_complete = io_poll_remove_waitqs(req); |
b41e9852 | 5284 | if (do_complete) { |
d4d19c19 | 5285 | io_cqring_fill_event(req->ctx, req->user_data, -ECANCELED, 0); |
b41e9852 | 5286 | io_commit_cqring(req->ctx); |
93d2bcd2 | 5287 | req_set_fail(req); |
216578e5 | 5288 | io_put_req_deferred(req, 1); |
b41e9852 JA |
5289 | } |
5290 | ||
5291 | return do_complete; | |
221c5eb2 JA |
5292 | } |
5293 | ||
76e1b642 JA |
5294 | /* |
5295 | * Returns true if we found and killed one or more poll requests | |
5296 | */ | |
6b81928d | 5297 | static bool io_poll_remove_all(struct io_ring_ctx *ctx, struct task_struct *tsk, |
3dd0c97a | 5298 | bool cancel_all) |
221c5eb2 | 5299 | { |
78076bb6 | 5300 | struct hlist_node *tmp; |
221c5eb2 | 5301 | struct io_kiocb *req; |
8e2e1faf | 5302 | int posted = 0, i; |
221c5eb2 JA |
5303 | |
5304 | spin_lock_irq(&ctx->completion_lock); | |
78076bb6 JA |
5305 | for (i = 0; i < (1U << ctx->cancel_hash_bits); i++) { |
5306 | struct hlist_head *list; | |
5307 | ||
5308 | list = &ctx->cancel_hash[i]; | |
f3606e3a | 5309 | hlist_for_each_entry_safe(req, tmp, list, hash_node) { |
3dd0c97a | 5310 | if (io_match_task(req, tsk, cancel_all)) |
f3606e3a JA |
5311 | posted += io_poll_remove_one(req); |
5312 | } | |
221c5eb2 JA |
5313 | } |
5314 | spin_unlock_irq(&ctx->completion_lock); | |
b41e9852 | 5315 | |
8e2e1faf JA |
5316 | if (posted) |
5317 | io_cqring_ev_posted(ctx); | |
76e1b642 JA |
5318 | |
5319 | return posted != 0; | |
221c5eb2 JA |
5320 | } |
5321 | ||
9ba5fac8 PB |
5322 | static struct io_kiocb *io_poll_find(struct io_ring_ctx *ctx, __u64 sqe_addr, |
5323 | bool poll_only) | |
e07785b0 | 5324 | __must_hold(&ctx->completion_lock) |
47f46768 | 5325 | { |
78076bb6 | 5326 | struct hlist_head *list; |
47f46768 JA |
5327 | struct io_kiocb *req; |
5328 | ||
78076bb6 JA |
5329 | list = &ctx->cancel_hash[hash_long(sqe_addr, ctx->cancel_hash_bits)]; |
5330 | hlist_for_each_entry(req, list, hash_node) { | |
b41e9852 JA |
5331 | if (sqe_addr != req->user_data) |
5332 | continue; | |
9ba5fac8 PB |
5333 | if (poll_only && req->opcode != IORING_OP_POLL_ADD) |
5334 | continue; | |
b2cb805f | 5335 | return req; |
47f46768 | 5336 | } |
b2cb805f JA |
5337 | return NULL; |
5338 | } | |
5339 | ||
9ba5fac8 PB |
5340 | static int io_poll_cancel(struct io_ring_ctx *ctx, __u64 sqe_addr, |
5341 | bool poll_only) | |
e07785b0 | 5342 | __must_hold(&ctx->completion_lock) |
b2cb805f JA |
5343 | { |
5344 | struct io_kiocb *req; | |
5345 | ||
9ba5fac8 | 5346 | req = io_poll_find(ctx, sqe_addr, poll_only); |
b2cb805f JA |
5347 | if (!req) |
5348 | return -ENOENT; | |
5349 | if (io_poll_remove_one(req)) | |
5350 | return 0; | |
5351 | ||
5352 | return -EALREADY; | |
47f46768 JA |
5353 | } |
5354 | ||
9096af3e PB |
5355 | static __poll_t io_poll_parse_events(const struct io_uring_sqe *sqe, |
5356 | unsigned int flags) | |
5357 | { | |
5358 | u32 events; | |
47f46768 | 5359 | |
9096af3e PB |
5360 | events = READ_ONCE(sqe->poll32_events); |
5361 | #ifdef __BIG_ENDIAN | |
5362 | events = swahw32(events); | |
5363 | #endif | |
5364 | if (!(flags & IORING_POLL_ADD_MULTI)) | |
5365 | events |= EPOLLONESHOT; | |
5366 | return demangle_poll(events) | (events & (EPOLLEXCLUSIVE|EPOLLONESHOT)); | |
47f46768 JA |
5367 | } |
5368 | ||
c5de0036 | 5369 | static int io_poll_update_prep(struct io_kiocb *req, |
3529d8c2 | 5370 | const struct io_uring_sqe *sqe) |
0969e783 | 5371 | { |
c5de0036 PB |
5372 | struct io_poll_update *upd = &req->poll_update; |
5373 | u32 flags; | |
5374 | ||
0969e783 JA |
5375 | if (unlikely(req->ctx->flags & IORING_SETUP_IOPOLL)) |
5376 | return -EINVAL; | |
c5de0036 PB |
5377 | if (sqe->ioprio || sqe->buf_index) |
5378 | return -EINVAL; | |
5379 | flags = READ_ONCE(sqe->len); | |
5380 | if (flags & ~(IORING_POLL_UPDATE_EVENTS | IORING_POLL_UPDATE_USER_DATA | | |
5381 | IORING_POLL_ADD_MULTI)) | |
5382 | return -EINVAL; | |
5383 | /* meaningless without update */ | |
5384 | if (flags == IORING_POLL_ADD_MULTI) | |
0969e783 JA |
5385 | return -EINVAL; |
5386 | ||
c5de0036 PB |
5387 | upd->old_user_data = READ_ONCE(sqe->addr); |
5388 | upd->update_events = flags & IORING_POLL_UPDATE_EVENTS; | |
5389 | upd->update_user_data = flags & IORING_POLL_UPDATE_USER_DATA; | |
221c5eb2 | 5390 | |
c5de0036 PB |
5391 | upd->new_user_data = READ_ONCE(sqe->off); |
5392 | if (!upd->update_user_data && upd->new_user_data) | |
5393 | return -EINVAL; | |
5394 | if (upd->update_events) | |
5395 | upd->events = io_poll_parse_events(sqe, flags); | |
5396 | else if (sqe->poll32_events) | |
5397 | return -EINVAL; | |
221c5eb2 | 5398 | |
221c5eb2 JA |
5399 | return 0; |
5400 | } | |
5401 | ||
221c5eb2 JA |
5402 | static int io_poll_wake(struct wait_queue_entry *wait, unsigned mode, int sync, |
5403 | void *key) | |
5404 | { | |
c2f2eb7d JA |
5405 | struct io_kiocb *req = wait->private; |
5406 | struct io_poll_iocb *poll = &req->poll; | |
221c5eb2 | 5407 | |
d7718a9d | 5408 | return __io_async_wake(req, poll, key_to_poll(key), io_poll_task_func); |
221c5eb2 JA |
5409 | } |
5410 | ||
221c5eb2 JA |
5411 | static void io_poll_queue_proc(struct file *file, struct wait_queue_head *head, |
5412 | struct poll_table_struct *p) | |
5413 | { | |
5414 | struct io_poll_table *pt = container_of(p, struct io_poll_table, pt); | |
5415 | ||
e8c2bc1f | 5416 | __io_queue_proc(&pt->req->poll, pt, head, (struct io_poll_iocb **) &pt->req->async_data); |
eac406c6 JA |
5417 | } |
5418 | ||
3529d8c2 | 5419 | static int io_poll_add_prep(struct io_kiocb *req, const struct io_uring_sqe *sqe) |
221c5eb2 JA |
5420 | { |
5421 | struct io_poll_iocb *poll = &req->poll; | |
c5de0036 | 5422 | u32 flags; |
221c5eb2 JA |
5423 | |
5424 | if (unlikely(req->ctx->flags & IORING_SETUP_IOPOLL)) | |
5425 | return -EINVAL; | |
c5de0036 | 5426 | if (sqe->ioprio || sqe->buf_index || sqe->off || sqe->addr) |
88e41cf9 JA |
5427 | return -EINVAL; |
5428 | flags = READ_ONCE(sqe->len); | |
c5de0036 | 5429 | if (flags & ~IORING_POLL_ADD_MULTI) |
221c5eb2 JA |
5430 | return -EINVAL; |
5431 | ||
c5de0036 | 5432 | poll->events = io_poll_parse_events(sqe, flags); |
0969e783 JA |
5433 | return 0; |
5434 | } | |
5435 | ||
61e98203 | 5436 | static int io_poll_add(struct io_kiocb *req, unsigned int issue_flags) |
0969e783 JA |
5437 | { |
5438 | struct io_poll_iocb *poll = &req->poll; | |
5439 | struct io_ring_ctx *ctx = req->ctx; | |
5440 | struct io_poll_table ipt; | |
0969e783 | 5441 | __poll_t mask; |
0969e783 | 5442 | |
d7718a9d | 5443 | ipt.pt._qproc = io_poll_queue_proc; |
36703247 | 5444 | |
d7718a9d JA |
5445 | mask = __io_arm_poll_handler(req, &req->poll, &ipt, poll->events, |
5446 | io_poll_wake); | |
221c5eb2 | 5447 | |
8c838788 | 5448 | if (mask) { /* no async, we'd stolen it */ |
221c5eb2 | 5449 | ipt.error = 0; |
e27414be | 5450 | io_poll_complete(req, mask); |
221c5eb2 | 5451 | } |
221c5eb2 JA |
5452 | spin_unlock_irq(&ctx->completion_lock); |
5453 | ||
8c838788 JA |
5454 | if (mask) { |
5455 | io_cqring_ev_posted(ctx); | |
88e41cf9 JA |
5456 | if (poll->events & EPOLLONESHOT) |
5457 | io_put_req(req); | |
221c5eb2 | 5458 | } |
8c838788 | 5459 | return ipt.error; |
221c5eb2 JA |
5460 | } |
5461 | ||
c5de0036 | 5462 | static int io_poll_update(struct io_kiocb *req, unsigned int issue_flags) |
b69de288 JA |
5463 | { |
5464 | struct io_ring_ctx *ctx = req->ctx; | |
5465 | struct io_kiocb *preq; | |
cb3b200e | 5466 | bool completing; |
b69de288 JA |
5467 | int ret; |
5468 | ||
5469 | spin_lock_irq(&ctx->completion_lock); | |
9ba5fac8 | 5470 | preq = io_poll_find(ctx, req->poll_update.old_user_data, true); |
b69de288 JA |
5471 | if (!preq) { |
5472 | ret = -ENOENT; | |
5473 | goto err; | |
b69de288 | 5474 | } |
cb3b200e | 5475 | |
c5de0036 PB |
5476 | if (!req->poll_update.update_events && !req->poll_update.update_user_data) { |
5477 | completing = true; | |
5478 | ret = io_poll_remove_one(preq) ? 0 : -EALREADY; | |
5479 | goto err; | |
5480 | } | |
5481 | ||
cb3b200e JA |
5482 | /* |
5483 | * Don't allow racy completion with singleshot, as we cannot safely | |
5484 | * update those. For multishot, if we're racing with completion, just | |
5485 | * let completion re-add it. | |
5486 | */ | |
5487 | completing = !__io_poll_remove_one(preq, &preq->poll, false); | |
5488 | if (completing && (preq->poll.events & EPOLLONESHOT)) { | |
5489 | ret = -EALREADY; | |
5490 | goto err; | |
b69de288 JA |
5491 | } |
5492 | /* we now have a detached poll request. reissue. */ | |
5493 | ret = 0; | |
5494 | err: | |
b69de288 | 5495 | if (ret < 0) { |
cb3b200e | 5496 | spin_unlock_irq(&ctx->completion_lock); |
93d2bcd2 | 5497 | req_set_fail(req); |
b69de288 JA |
5498 | io_req_complete(req, ret); |
5499 | return 0; | |
5500 | } | |
5501 | /* only mask one event flags, keep behavior flags */ | |
9d805892 | 5502 | if (req->poll_update.update_events) { |
b69de288 | 5503 | preq->poll.events &= ~0xffff; |
9d805892 | 5504 | preq->poll.events |= req->poll_update.events & 0xffff; |
b69de288 JA |
5505 | preq->poll.events |= IO_POLL_UNMASK; |
5506 | } | |
9d805892 PB |
5507 | if (req->poll_update.update_user_data) |
5508 | preq->user_data = req->poll_update.new_user_data; | |
cb3b200e JA |
5509 | spin_unlock_irq(&ctx->completion_lock); |
5510 | ||
b69de288 JA |
5511 | /* complete update request, we're done with it */ |
5512 | io_req_complete(req, ret); | |
5513 | ||
cb3b200e | 5514 | if (!completing) { |
c5de0036 | 5515 | ret = io_poll_add(preq, issue_flags); |
cb3b200e | 5516 | if (ret < 0) { |
93d2bcd2 | 5517 | req_set_fail(preq); |
cb3b200e JA |
5518 | io_req_complete(preq, ret); |
5519 | } | |
b69de288 JA |
5520 | } |
5521 | return 0; | |
5522 | } | |
5523 | ||
5262f567 JA |
5524 | static enum hrtimer_restart io_timeout_fn(struct hrtimer *timer) |
5525 | { | |
ad8a48ac JA |
5526 | struct io_timeout_data *data = container_of(timer, |
5527 | struct io_timeout_data, timer); | |
5528 | struct io_kiocb *req = data->req; | |
5529 | struct io_ring_ctx *ctx = req->ctx; | |
5262f567 JA |
5530 | unsigned long flags; |
5531 | ||
5262f567 | 5532 | spin_lock_irqsave(&ctx->completion_lock, flags); |
a71976f3 | 5533 | list_del_init(&req->timeout.list); |
01cec8c1 PB |
5534 | atomic_set(&req->ctx->cq_timeouts, |
5535 | atomic_read(&req->ctx->cq_timeouts) + 1); | |
5536 | ||
d4d19c19 | 5537 | io_cqring_fill_event(ctx, req->user_data, -ETIME, 0); |
5262f567 JA |
5538 | io_commit_cqring(ctx); |
5539 | spin_unlock_irqrestore(&ctx->completion_lock, flags); | |
5540 | ||
5541 | io_cqring_ev_posted(ctx); | |
93d2bcd2 | 5542 | req_set_fail(req); |
5262f567 JA |
5543 | io_put_req(req); |
5544 | return HRTIMER_NORESTART; | |
5545 | } | |
5546 | ||
fbd15848 PB |
5547 | static struct io_kiocb *io_timeout_extract(struct io_ring_ctx *ctx, |
5548 | __u64 user_data) | |
e07785b0 | 5549 | __must_hold(&ctx->completion_lock) |
f254ac04 | 5550 | { |
fbd15848 | 5551 | struct io_timeout_data *io; |
47f46768 | 5552 | struct io_kiocb *req; |
fd9c7bc5 | 5553 | bool found = false; |
f254ac04 | 5554 | |
135fcde8 | 5555 | list_for_each_entry(req, &ctx->timeout_list, timeout.list) { |
fd9c7bc5 PB |
5556 | found = user_data == req->user_data; |
5557 | if (found) | |
47f46768 | 5558 | break; |
47f46768 | 5559 | } |
fd9c7bc5 PB |
5560 | if (!found) |
5561 | return ERR_PTR(-ENOENT); | |
fbd15848 PB |
5562 | |
5563 | io = req->async_data; | |
fd9c7bc5 | 5564 | if (hrtimer_try_to_cancel(&io->timer) == -1) |
fbd15848 | 5565 | return ERR_PTR(-EALREADY); |
a71976f3 | 5566 | list_del_init(&req->timeout.list); |
fbd15848 PB |
5567 | return req; |
5568 | } | |
47f46768 | 5569 | |
fbd15848 | 5570 | static int io_timeout_cancel(struct io_ring_ctx *ctx, __u64 user_data) |
e07785b0 | 5571 | __must_hold(&ctx->completion_lock) |
fbd15848 PB |
5572 | { |
5573 | struct io_kiocb *req = io_timeout_extract(ctx, user_data); | |
5574 | ||
5575 | if (IS_ERR(req)) | |
5576 | return PTR_ERR(req); | |
f254ac04 | 5577 | |
93d2bcd2 | 5578 | req_set_fail(req); |
d4d19c19 | 5579 | io_cqring_fill_event(ctx, req->user_data, -ECANCELED, 0); |
216578e5 | 5580 | io_put_req_deferred(req, 1); |
f254ac04 JA |
5581 | return 0; |
5582 | } | |
5583 | ||
9c8e11b3 PB |
5584 | static int io_timeout_update(struct io_ring_ctx *ctx, __u64 user_data, |
5585 | struct timespec64 *ts, enum hrtimer_mode mode) | |
e07785b0 | 5586 | __must_hold(&ctx->completion_lock) |
47f46768 | 5587 | { |
9c8e11b3 PB |
5588 | struct io_kiocb *req = io_timeout_extract(ctx, user_data); |
5589 | struct io_timeout_data *data; | |
47f46768 | 5590 | |
9c8e11b3 PB |
5591 | if (IS_ERR(req)) |
5592 | return PTR_ERR(req); | |
47f46768 | 5593 | |
9c8e11b3 PB |
5594 | req->timeout.off = 0; /* noseq */ |
5595 | data = req->async_data; | |
5596 | list_add_tail(&req->timeout.list, &ctx->timeout_list); | |
5597 | hrtimer_init(&data->timer, CLOCK_MONOTONIC, mode); | |
5598 | data->timer.function = io_timeout_fn; | |
5599 | hrtimer_start(&data->timer, timespec64_to_ktime(*ts), mode); | |
5600 | return 0; | |
47f46768 JA |
5601 | } |
5602 | ||
3529d8c2 JA |
5603 | static int io_timeout_remove_prep(struct io_kiocb *req, |
5604 | const struct io_uring_sqe *sqe) | |
b29472ee | 5605 | { |
9c8e11b3 PB |
5606 | struct io_timeout_rem *tr = &req->timeout_rem; |
5607 | ||
b29472ee JA |
5608 | if (unlikely(req->ctx->flags & IORING_SETUP_IOPOLL)) |
5609 | return -EINVAL; | |
61710e43 DA |
5610 | if (unlikely(req->flags & (REQ_F_FIXED_FILE | REQ_F_BUFFER_SELECT))) |
5611 | return -EINVAL; | |
9c8e11b3 | 5612 | if (sqe->ioprio || sqe->buf_index || sqe->len) |
b29472ee JA |
5613 | return -EINVAL; |
5614 | ||
9c8e11b3 PB |
5615 | tr->addr = READ_ONCE(sqe->addr); |
5616 | tr->flags = READ_ONCE(sqe->timeout_flags); | |
5617 | if (tr->flags & IORING_TIMEOUT_UPDATE) { | |
5618 | if (tr->flags & ~(IORING_TIMEOUT_UPDATE|IORING_TIMEOUT_ABS)) | |
5619 | return -EINVAL; | |
5620 | if (get_timespec64(&tr->ts, u64_to_user_ptr(sqe->addr2))) | |
5621 | return -EFAULT; | |
5622 | } else if (tr->flags) { | |
5623 | /* timeout removal doesn't support flags */ | |
b29472ee | 5624 | return -EINVAL; |
9c8e11b3 | 5625 | } |
b29472ee | 5626 | |
b29472ee JA |
5627 | return 0; |
5628 | } | |
5629 | ||
8662daec PB |
5630 | static inline enum hrtimer_mode io_translate_timeout_mode(unsigned int flags) |
5631 | { | |
5632 | return (flags & IORING_TIMEOUT_ABS) ? HRTIMER_MODE_ABS | |
5633 | : HRTIMER_MODE_REL; | |
5634 | } | |
5635 | ||
11365043 JA |
5636 | /* |
5637 | * Remove or update an existing timeout command | |
5638 | */ | |
61e98203 | 5639 | static int io_timeout_remove(struct io_kiocb *req, unsigned int issue_flags) |
11365043 | 5640 | { |
9c8e11b3 | 5641 | struct io_timeout_rem *tr = &req->timeout_rem; |
11365043 | 5642 | struct io_ring_ctx *ctx = req->ctx; |
47f46768 | 5643 | int ret; |
11365043 | 5644 | |
11365043 | 5645 | spin_lock_irq(&ctx->completion_lock); |
8662daec | 5646 | if (!(req->timeout_rem.flags & IORING_TIMEOUT_UPDATE)) |
9c8e11b3 | 5647 | ret = io_timeout_cancel(ctx, tr->addr); |
8662daec PB |
5648 | else |
5649 | ret = io_timeout_update(ctx, tr->addr, &tr->ts, | |
5650 | io_translate_timeout_mode(tr->flags)); | |
11365043 | 5651 | |
d4d19c19 | 5652 | io_cqring_fill_event(ctx, req->user_data, ret, 0); |
11365043 JA |
5653 | io_commit_cqring(ctx); |
5654 | spin_unlock_irq(&ctx->completion_lock); | |
5262f567 | 5655 | io_cqring_ev_posted(ctx); |
4e88d6e7 | 5656 | if (ret < 0) |
93d2bcd2 | 5657 | req_set_fail(req); |
ec9c02ad | 5658 | io_put_req(req); |
11365043 | 5659 | return 0; |
5262f567 JA |
5660 | } |
5661 | ||
3529d8c2 | 5662 | static int io_timeout_prep(struct io_kiocb *req, const struct io_uring_sqe *sqe, |
2d28390a | 5663 | bool is_timeout_link) |
5262f567 | 5664 | { |
ad8a48ac | 5665 | struct io_timeout_data *data; |
a41525ab | 5666 | unsigned flags; |
56080b02 | 5667 | u32 off = READ_ONCE(sqe->off); |
5262f567 | 5668 | |
ad8a48ac | 5669 | if (unlikely(req->ctx->flags & IORING_SETUP_IOPOLL)) |
5262f567 | 5670 | return -EINVAL; |
ad8a48ac | 5671 | if (sqe->ioprio || sqe->buf_index || sqe->len != 1) |
a41525ab | 5672 | return -EINVAL; |
56080b02 | 5673 | if (off && is_timeout_link) |
2d28390a | 5674 | return -EINVAL; |
a41525ab JA |
5675 | flags = READ_ONCE(sqe->timeout_flags); |
5676 | if (flags & ~IORING_TIMEOUT_ABS) | |
5262f567 | 5677 | return -EINVAL; |
bdf20073 | 5678 | |
bfe68a22 | 5679 | req->timeout.off = off; |
f18ee4cf PB |
5680 | if (unlikely(off && !req->ctx->off_timeout_used)) |
5681 | req->ctx->off_timeout_used = true; | |
26a61679 | 5682 | |
e8c2bc1f | 5683 | if (!req->async_data && io_alloc_async_data(req)) |
26a61679 JA |
5684 | return -ENOMEM; |
5685 | ||
e8c2bc1f | 5686 | data = req->async_data; |
ad8a48ac | 5687 | data->req = req; |
ad8a48ac JA |
5688 | |
5689 | if (get_timespec64(&data->ts, u64_to_user_ptr(sqe->addr))) | |
5262f567 JA |
5690 | return -EFAULT; |
5691 | ||
8662daec | 5692 | data->mode = io_translate_timeout_mode(flags); |
ad8a48ac | 5693 | hrtimer_init(&data->timer, CLOCK_MONOTONIC, data->mode); |
2482b58f PB |
5694 | if (is_timeout_link) |
5695 | io_req_track_inflight(req); | |
ad8a48ac JA |
5696 | return 0; |
5697 | } | |
5698 | ||
61e98203 | 5699 | static int io_timeout(struct io_kiocb *req, unsigned int issue_flags) |
ad8a48ac | 5700 | { |
ad8a48ac | 5701 | struct io_ring_ctx *ctx = req->ctx; |
e8c2bc1f | 5702 | struct io_timeout_data *data = req->async_data; |
ad8a48ac | 5703 | struct list_head *entry; |
bfe68a22 | 5704 | u32 tail, off = req->timeout.off; |
ad8a48ac | 5705 | |
733f5c95 | 5706 | spin_lock_irq(&ctx->completion_lock); |
93bd25bb | 5707 | |
5262f567 JA |
5708 | /* |
5709 | * sqe->off holds how many events that need to occur for this | |
93bd25bb JA |
5710 | * timeout event to be satisfied. If it isn't set, then this is |
5711 | * a pure timeout request, sequence isn't used. | |
5262f567 | 5712 | */ |
8eb7e2d0 | 5713 | if (io_is_timeout_noseq(req)) { |
93bd25bb JA |
5714 | entry = ctx->timeout_list.prev; |
5715 | goto add; | |
5716 | } | |
5262f567 | 5717 | |
bfe68a22 PB |
5718 | tail = ctx->cached_cq_tail - atomic_read(&ctx->cq_timeouts); |
5719 | req->timeout.target_seq = tail + off; | |
5262f567 | 5720 | |
f010505b MDG |
5721 | /* Update the last seq here in case io_flush_timeouts() hasn't. |
5722 | * This is safe because ->completion_lock is held, and submissions | |
5723 | * and completions are never mixed in the same ->completion_lock section. | |
5724 | */ | |
5725 | ctx->cq_last_tm_flush = tail; | |
5726 | ||
5262f567 JA |
5727 | /* |
5728 | * Insertion sort, ensuring the first entry in the list is always | |
5729 | * the one we need first. | |
5730 | */ | |
5262f567 | 5731 | list_for_each_prev(entry, &ctx->timeout_list) { |
135fcde8 PB |
5732 | struct io_kiocb *nxt = list_entry(entry, struct io_kiocb, |
5733 | timeout.list); | |
5262f567 | 5734 | |
8eb7e2d0 | 5735 | if (io_is_timeout_noseq(nxt)) |
93bd25bb | 5736 | continue; |
bfe68a22 PB |
5737 | /* nxt.seq is behind @tail, otherwise would've been completed */ |
5738 | if (off >= nxt->timeout.target_seq - tail) | |
5262f567 JA |
5739 | break; |
5740 | } | |
93bd25bb | 5741 | add: |
135fcde8 | 5742 | list_add(&req->timeout.list, entry); |
ad8a48ac JA |
5743 | data->timer.function = io_timeout_fn; |
5744 | hrtimer_start(&data->timer, timespec64_to_ktime(data->ts), data->mode); | |
5262f567 | 5745 | spin_unlock_irq(&ctx->completion_lock); |
5262f567 JA |
5746 | return 0; |
5747 | } | |
5262f567 | 5748 | |
f458dd84 PB |
5749 | struct io_cancel_data { |
5750 | struct io_ring_ctx *ctx; | |
5751 | u64 user_data; | |
5752 | }; | |
5753 | ||
62755e35 JA |
5754 | static bool io_cancel_cb(struct io_wq_work *work, void *data) |
5755 | { | |
5756 | struct io_kiocb *req = container_of(work, struct io_kiocb, work); | |
f458dd84 | 5757 | struct io_cancel_data *cd = data; |
62755e35 | 5758 | |
f458dd84 | 5759 | return req->ctx == cd->ctx && req->user_data == cd->user_data; |
62755e35 JA |
5760 | } |
5761 | ||
f458dd84 PB |
5762 | static int io_async_cancel_one(struct io_uring_task *tctx, u64 user_data, |
5763 | struct io_ring_ctx *ctx) | |
62755e35 | 5764 | { |
f458dd84 | 5765 | struct io_cancel_data data = { .ctx = ctx, .user_data = user_data, }; |
62755e35 | 5766 | enum io_wq_cancel cancel_ret; |
62755e35 JA |
5767 | int ret = 0; |
5768 | ||
f458dd84 | 5769 | if (!tctx || !tctx->io_wq) |
5aa75ed5 JA |
5770 | return -ENOENT; |
5771 | ||
f458dd84 | 5772 | cancel_ret = io_wq_cancel_cb(tctx->io_wq, io_cancel_cb, &data, false); |
62755e35 JA |
5773 | switch (cancel_ret) { |
5774 | case IO_WQ_CANCEL_OK: | |
5775 | ret = 0; | |
5776 | break; | |
5777 | case IO_WQ_CANCEL_RUNNING: | |
5778 | ret = -EALREADY; | |
5779 | break; | |
5780 | case IO_WQ_CANCEL_NOTFOUND: | |
5781 | ret = -ENOENT; | |
5782 | break; | |
5783 | } | |
5784 | ||
e977d6d3 JA |
5785 | return ret; |
5786 | } | |
5787 | ||
47f46768 JA |
5788 | static void io_async_find_and_cancel(struct io_ring_ctx *ctx, |
5789 | struct io_kiocb *req, __u64 sqe_addr, | |
014db007 | 5790 | int success_ret) |
47f46768 JA |
5791 | { |
5792 | unsigned long flags; | |
5793 | int ret; | |
5794 | ||
f458dd84 | 5795 | ret = io_async_cancel_one(req->task->io_uring, sqe_addr, ctx); |
47f46768 | 5796 | spin_lock_irqsave(&ctx->completion_lock, flags); |
df9727af PB |
5797 | if (ret != -ENOENT) |
5798 | goto done; | |
47f46768 JA |
5799 | ret = io_timeout_cancel(ctx, sqe_addr); |
5800 | if (ret != -ENOENT) | |
5801 | goto done; | |
9ba5fac8 | 5802 | ret = io_poll_cancel(ctx, sqe_addr, false); |
47f46768 | 5803 | done: |
b0dd8a41 JA |
5804 | if (!ret) |
5805 | ret = success_ret; | |
d4d19c19 | 5806 | io_cqring_fill_event(ctx, req->user_data, ret, 0); |
47f46768 JA |
5807 | io_commit_cqring(ctx); |
5808 | spin_unlock_irqrestore(&ctx->completion_lock, flags); | |
5809 | io_cqring_ev_posted(ctx); | |
5810 | ||
4e88d6e7 | 5811 | if (ret < 0) |
93d2bcd2 | 5812 | req_set_fail(req); |
47f46768 JA |
5813 | } |
5814 | ||
3529d8c2 JA |
5815 | static int io_async_cancel_prep(struct io_kiocb *req, |
5816 | const struct io_uring_sqe *sqe) | |
e977d6d3 | 5817 | { |
fbf23849 | 5818 | if (unlikely(req->ctx->flags & IORING_SETUP_IOPOLL)) |
e977d6d3 | 5819 | return -EINVAL; |
61710e43 DA |
5820 | if (unlikely(req->flags & (REQ_F_FIXED_FILE | REQ_F_BUFFER_SELECT))) |
5821 | return -EINVAL; | |
5822 | if (sqe->ioprio || sqe->off || sqe->len || sqe->cancel_flags) | |
e977d6d3 JA |
5823 | return -EINVAL; |
5824 | ||
fbf23849 JA |
5825 | req->cancel.addr = READ_ONCE(sqe->addr); |
5826 | return 0; | |
5827 | } | |
5828 | ||
61e98203 | 5829 | static int io_async_cancel(struct io_kiocb *req, unsigned int issue_flags) |
fbf23849 JA |
5830 | { |
5831 | struct io_ring_ctx *ctx = req->ctx; | |
58f99373 PB |
5832 | u64 sqe_addr = req->cancel.addr; |
5833 | struct io_tctx_node *node; | |
5834 | int ret; | |
5835 | ||
5836 | /* tasks should wait for their io-wq threads, so safe w/o sync */ | |
5837 | ret = io_async_cancel_one(req->task->io_uring, sqe_addr, ctx); | |
5838 | spin_lock_irq(&ctx->completion_lock); | |
5839 | if (ret != -ENOENT) | |
5840 | goto done; | |
5841 | ret = io_timeout_cancel(ctx, sqe_addr); | |
5842 | if (ret != -ENOENT) | |
5843 | goto done; | |
9ba5fac8 | 5844 | ret = io_poll_cancel(ctx, sqe_addr, false); |
58f99373 PB |
5845 | if (ret != -ENOENT) |
5846 | goto done; | |
5847 | spin_unlock_irq(&ctx->completion_lock); | |
5848 | ||
5849 | /* slow path, try all io-wq's */ | |
5850 | io_ring_submit_lock(ctx, !(issue_flags & IO_URING_F_NONBLOCK)); | |
5851 | ret = -ENOENT; | |
5852 | list_for_each_entry(node, &ctx->tctx_list, ctx_node) { | |
5853 | struct io_uring_task *tctx = node->task->io_uring; | |
fbf23849 | 5854 | |
58f99373 PB |
5855 | ret = io_async_cancel_one(tctx, req->cancel.addr, ctx); |
5856 | if (ret != -ENOENT) | |
5857 | break; | |
5858 | } | |
5859 | io_ring_submit_unlock(ctx, !(issue_flags & IO_URING_F_NONBLOCK)); | |
5860 | ||
5861 | spin_lock_irq(&ctx->completion_lock); | |
5862 | done: | |
d4d19c19 | 5863 | io_cqring_fill_event(ctx, req->user_data, ret, 0); |
58f99373 PB |
5864 | io_commit_cqring(ctx); |
5865 | spin_unlock_irq(&ctx->completion_lock); | |
5866 | io_cqring_ev_posted(ctx); | |
5867 | ||
5868 | if (ret < 0) | |
93d2bcd2 | 5869 | req_set_fail(req); |
58f99373 | 5870 | io_put_req(req); |
5262f567 JA |
5871 | return 0; |
5872 | } | |
5873 | ||
269bbe5f | 5874 | static int io_rsrc_update_prep(struct io_kiocb *req, |
05f3fb3c JA |
5875 | const struct io_uring_sqe *sqe) |
5876 | { | |
61710e43 DA |
5877 | if (unlikely(req->flags & (REQ_F_FIXED_FILE | REQ_F_BUFFER_SELECT))) |
5878 | return -EINVAL; | |
5879 | if (sqe->ioprio || sqe->rw_flags) | |
05f3fb3c JA |
5880 | return -EINVAL; |
5881 | ||
269bbe5f BM |
5882 | req->rsrc_update.offset = READ_ONCE(sqe->off); |
5883 | req->rsrc_update.nr_args = READ_ONCE(sqe->len); | |
5884 | if (!req->rsrc_update.nr_args) | |
05f3fb3c | 5885 | return -EINVAL; |
269bbe5f | 5886 | req->rsrc_update.arg = READ_ONCE(sqe->addr); |
05f3fb3c JA |
5887 | return 0; |
5888 | } | |
5889 | ||
889fca73 | 5890 | static int io_files_update(struct io_kiocb *req, unsigned int issue_flags) |
fbf23849 JA |
5891 | { |
5892 | struct io_ring_ctx *ctx = req->ctx; | |
c3bdad02 | 5893 | struct io_uring_rsrc_update2 up; |
05f3fb3c | 5894 | int ret; |
fbf23849 | 5895 | |
45d189c6 | 5896 | if (issue_flags & IO_URING_F_NONBLOCK) |
05f3fb3c | 5897 | return -EAGAIN; |
05f3fb3c | 5898 | |
269bbe5f BM |
5899 | up.offset = req->rsrc_update.offset; |
5900 | up.data = req->rsrc_update.arg; | |
c3bdad02 PB |
5901 | up.nr = 0; |
5902 | up.tags = 0; | |
615cee49 | 5903 | up.resv = 0; |
05f3fb3c JA |
5904 | |
5905 | mutex_lock(&ctx->uring_lock); | |
fdecb662 | 5906 | ret = __io_register_rsrc_update(ctx, IORING_RSRC_FILE, |
98f0b3b4 | 5907 | &up, req->rsrc_update.nr_args); |
05f3fb3c JA |
5908 | mutex_unlock(&ctx->uring_lock); |
5909 | ||
5910 | if (ret < 0) | |
93d2bcd2 | 5911 | req_set_fail(req); |
889fca73 | 5912 | __io_req_complete(req, issue_flags, ret, 0); |
5262f567 JA |
5913 | return 0; |
5914 | } | |
5915 | ||
bfe76559 | 5916 | static int io_req_prep(struct io_kiocb *req, const struct io_uring_sqe *sqe) |
f67676d1 | 5917 | { |
d625c6ee | 5918 | switch (req->opcode) { |
e781573e | 5919 | case IORING_OP_NOP: |
bfe76559 | 5920 | return 0; |
f67676d1 JA |
5921 | case IORING_OP_READV: |
5922 | case IORING_OP_READ_FIXED: | |
3a6820f2 | 5923 | case IORING_OP_READ: |
bfe76559 | 5924 | return io_read_prep(req, sqe); |
f67676d1 JA |
5925 | case IORING_OP_WRITEV: |
5926 | case IORING_OP_WRITE_FIXED: | |
3a6820f2 | 5927 | case IORING_OP_WRITE: |
bfe76559 | 5928 | return io_write_prep(req, sqe); |
0969e783 | 5929 | case IORING_OP_POLL_ADD: |
bfe76559 | 5930 | return io_poll_add_prep(req, sqe); |
0969e783 | 5931 | case IORING_OP_POLL_REMOVE: |
c5de0036 | 5932 | return io_poll_update_prep(req, sqe); |
8ed8d3c3 | 5933 | case IORING_OP_FSYNC: |
1155c76a | 5934 | return io_fsync_prep(req, sqe); |
8ed8d3c3 | 5935 | case IORING_OP_SYNC_FILE_RANGE: |
1155c76a | 5936 | return io_sfr_prep(req, sqe); |
03b1230c | 5937 | case IORING_OP_SENDMSG: |
fddaface | 5938 | case IORING_OP_SEND: |
bfe76559 | 5939 | return io_sendmsg_prep(req, sqe); |
03b1230c | 5940 | case IORING_OP_RECVMSG: |
fddaface | 5941 | case IORING_OP_RECV: |
bfe76559 | 5942 | return io_recvmsg_prep(req, sqe); |
f499a021 | 5943 | case IORING_OP_CONNECT: |
bfe76559 | 5944 | return io_connect_prep(req, sqe); |
2d28390a | 5945 | case IORING_OP_TIMEOUT: |
bfe76559 | 5946 | return io_timeout_prep(req, sqe, false); |
b29472ee | 5947 | case IORING_OP_TIMEOUT_REMOVE: |
bfe76559 | 5948 | return io_timeout_remove_prep(req, sqe); |
fbf23849 | 5949 | case IORING_OP_ASYNC_CANCEL: |
bfe76559 | 5950 | return io_async_cancel_prep(req, sqe); |
2d28390a | 5951 | case IORING_OP_LINK_TIMEOUT: |
bfe76559 | 5952 | return io_timeout_prep(req, sqe, true); |
8ed8d3c3 | 5953 | case IORING_OP_ACCEPT: |
bfe76559 | 5954 | return io_accept_prep(req, sqe); |
d63d1b5e | 5955 | case IORING_OP_FALLOCATE: |
bfe76559 | 5956 | return io_fallocate_prep(req, sqe); |
15b71abe | 5957 | case IORING_OP_OPENAT: |
bfe76559 | 5958 | return io_openat_prep(req, sqe); |
b5dba59e | 5959 | case IORING_OP_CLOSE: |
bfe76559 | 5960 | return io_close_prep(req, sqe); |
05f3fb3c | 5961 | case IORING_OP_FILES_UPDATE: |
269bbe5f | 5962 | return io_rsrc_update_prep(req, sqe); |
eddc7ef5 | 5963 | case IORING_OP_STATX: |
bfe76559 | 5964 | return io_statx_prep(req, sqe); |
4840e418 | 5965 | case IORING_OP_FADVISE: |
bfe76559 | 5966 | return io_fadvise_prep(req, sqe); |
c1ca757b | 5967 | case IORING_OP_MADVISE: |
bfe76559 | 5968 | return io_madvise_prep(req, sqe); |
cebdb986 | 5969 | case IORING_OP_OPENAT2: |
bfe76559 | 5970 | return io_openat2_prep(req, sqe); |
3e4827b0 | 5971 | case IORING_OP_EPOLL_CTL: |
bfe76559 | 5972 | return io_epoll_ctl_prep(req, sqe); |
7d67af2c | 5973 | case IORING_OP_SPLICE: |
bfe76559 | 5974 | return io_splice_prep(req, sqe); |
ddf0322d | 5975 | case IORING_OP_PROVIDE_BUFFERS: |
bfe76559 | 5976 | return io_provide_buffers_prep(req, sqe); |
067524e9 | 5977 | case IORING_OP_REMOVE_BUFFERS: |
bfe76559 | 5978 | return io_remove_buffers_prep(req, sqe); |
f2a8d5c7 | 5979 | case IORING_OP_TEE: |
bfe76559 | 5980 | return io_tee_prep(req, sqe); |
36f4fa68 JA |
5981 | case IORING_OP_SHUTDOWN: |
5982 | return io_shutdown_prep(req, sqe); | |
80a261fd JA |
5983 | case IORING_OP_RENAMEAT: |
5984 | return io_renameat_prep(req, sqe); | |
14a1143b JA |
5985 | case IORING_OP_UNLINKAT: |
5986 | return io_unlinkat_prep(req, sqe); | |
f67676d1 JA |
5987 | } |
5988 | ||
bfe76559 PB |
5989 | printk_once(KERN_WARNING "io_uring: unhandled opcode %d\n", |
5990 | req->opcode); | |
bd54b6fe | 5991 | return -EINVAL; |
bfe76559 PB |
5992 | } |
5993 | ||
93642ef8 | 5994 | static int io_req_prep_async(struct io_kiocb *req) |
bfe76559 | 5995 | { |
b7e298d2 PB |
5996 | if (!io_op_defs[req->opcode].needs_async_setup) |
5997 | return 0; | |
5998 | if (WARN_ON_ONCE(req->async_data)) | |
5999 | return -EFAULT; | |
6000 | if (io_alloc_async_data(req)) | |
6001 | return -EAGAIN; | |
6002 | ||
93642ef8 PB |
6003 | switch (req->opcode) { |
6004 | case IORING_OP_READV: | |
93642ef8 PB |
6005 | return io_rw_prep_async(req, READ); |
6006 | case IORING_OP_WRITEV: | |
93642ef8 PB |
6007 | return io_rw_prep_async(req, WRITE); |
6008 | case IORING_OP_SENDMSG: | |
93642ef8 PB |
6009 | return io_sendmsg_prep_async(req); |
6010 | case IORING_OP_RECVMSG: | |
93642ef8 PB |
6011 | return io_recvmsg_prep_async(req); |
6012 | case IORING_OP_CONNECT: | |
6013 | return io_connect_prep_async(req); | |
6014 | } | |
b7e298d2 PB |
6015 | printk_once(KERN_WARNING "io_uring: prep_async() bad opcode %d\n", |
6016 | req->opcode); | |
6017 | return -EFAULT; | |
f67676d1 JA |
6018 | } |
6019 | ||
9cf7c104 PB |
6020 | static u32 io_get_sequence(struct io_kiocb *req) |
6021 | { | |
a3dbdf54 | 6022 | u32 seq = req->ctx->cached_sq_head; |
9cf7c104 | 6023 | |
a3dbdf54 PB |
6024 | /* need original cached_sq_head, but it was increased for each req */ |
6025 | io_for_each_link(req, req) | |
6026 | seq--; | |
6027 | return seq; | |
9cf7c104 PB |
6028 | } |
6029 | ||
76cc33d7 | 6030 | static bool io_drain_req(struct io_kiocb *req) |
de0617e4 | 6031 | { |
3c19966d | 6032 | struct io_kiocb *pos; |
a197f664 | 6033 | struct io_ring_ctx *ctx = req->ctx; |
27dc8338 | 6034 | struct io_defer_entry *de; |
f67676d1 | 6035 | int ret; |
9cf7c104 | 6036 | u32 seq; |
de0617e4 | 6037 | |
3c19966d PB |
6038 | /* |
6039 | * If we need to drain a request in the middle of a link, drain the | |
6040 | * head request and the next request/link after the current link. | |
6041 | * Considering sequential execution of links, IOSQE_IO_DRAIN will be | |
6042 | * maintained for every request of our link. | |
6043 | */ | |
6044 | if (ctx->drain_next) { | |
6045 | req->flags |= REQ_F_IO_DRAIN; | |
6046 | ctx->drain_next = false; | |
6047 | } | |
6048 | /* not interested in head, start from the first linked */ | |
6049 | io_for_each_link(pos, req->link) { | |
6050 | if (pos->flags & REQ_F_IO_DRAIN) { | |
6051 | ctx->drain_next = true; | |
6052 | req->flags |= REQ_F_IO_DRAIN; | |
6053 | break; | |
6054 | } | |
6055 | } | |
6056 | ||
9d858b21 | 6057 | /* Still need defer if there is pending req in defer list. */ |
9cf7c104 | 6058 | if (likely(list_empty_careful(&ctx->defer_list) && |
10c66904 PB |
6059 | !(req->flags & REQ_F_IO_DRAIN))) { |
6060 | ctx->drain_active = false; | |
76cc33d7 | 6061 | return false; |
10c66904 | 6062 | } |
9cf7c104 PB |
6063 | |
6064 | seq = io_get_sequence(req); | |
6065 | /* Still a chance to pass the sequence check */ | |
6066 | if (!req_need_defer(req, seq) && list_empty_careful(&ctx->defer_list)) | |
76cc33d7 | 6067 | return false; |
de0617e4 | 6068 | |
b7e298d2 | 6069 | ret = io_req_prep_async(req); |
be7053b7 | 6070 | if (ret) |
1b48773f | 6071 | goto fail; |
cbdcb435 | 6072 | io_prep_async_link(req); |
27dc8338 | 6073 | de = kmalloc(sizeof(*de), GFP_KERNEL); |
76cc33d7 | 6074 | if (!de) { |
1b48773f PB |
6075 | ret = -ENOMEM; |
6076 | fail: | |
6077 | io_req_complete_failed(req, ret); | |
76cc33d7 PB |
6078 | return true; |
6079 | } | |
2d28390a | 6080 | |
de0617e4 | 6081 | spin_lock_irq(&ctx->completion_lock); |
9cf7c104 | 6082 | if (!req_need_defer(req, seq) && list_empty(&ctx->defer_list)) { |
de0617e4 | 6083 | spin_unlock_irq(&ctx->completion_lock); |
27dc8338 | 6084 | kfree(de); |
ae34817b | 6085 | io_queue_async_work(req); |
76cc33d7 | 6086 | return true; |
de0617e4 JA |
6087 | } |
6088 | ||
915967f6 | 6089 | trace_io_uring_defer(ctx, req, req->user_data); |
27dc8338 | 6090 | de->req = req; |
9cf7c104 | 6091 | de->seq = seq; |
27dc8338 | 6092 | list_add_tail(&de->list, &ctx->defer_list); |
de0617e4 | 6093 | spin_unlock_irq(&ctx->completion_lock); |
76cc33d7 | 6094 | return true; |
de0617e4 JA |
6095 | } |
6096 | ||
68fb8979 | 6097 | static void io_clean_op(struct io_kiocb *req) |
99bc4c38 | 6098 | { |
0e1b6fe3 PB |
6099 | if (req->flags & REQ_F_BUFFER_SELECTED) { |
6100 | switch (req->opcode) { | |
6101 | case IORING_OP_READV: | |
6102 | case IORING_OP_READ_FIXED: | |
6103 | case IORING_OP_READ: | |
bcda7baa | 6104 | kfree((void *)(unsigned long)req->rw.addr); |
0e1b6fe3 PB |
6105 | break; |
6106 | case IORING_OP_RECVMSG: | |
6107 | case IORING_OP_RECV: | |
bcda7baa | 6108 | kfree(req->sr_msg.kbuf); |
0e1b6fe3 PB |
6109 | break; |
6110 | } | |
99bc4c38 PB |
6111 | } |
6112 | ||
0e1b6fe3 PB |
6113 | if (req->flags & REQ_F_NEED_CLEANUP) { |
6114 | switch (req->opcode) { | |
6115 | case IORING_OP_READV: | |
6116 | case IORING_OP_READ_FIXED: | |
6117 | case IORING_OP_READ: | |
6118 | case IORING_OP_WRITEV: | |
6119 | case IORING_OP_WRITE_FIXED: | |
e8c2bc1f JA |
6120 | case IORING_OP_WRITE: { |
6121 | struct io_async_rw *io = req->async_data; | |
1dacb4df PB |
6122 | |
6123 | kfree(io->free_iovec); | |
0e1b6fe3 | 6124 | break; |
e8c2bc1f | 6125 | } |
0e1b6fe3 | 6126 | case IORING_OP_RECVMSG: |
e8c2bc1f JA |
6127 | case IORING_OP_SENDMSG: { |
6128 | struct io_async_msghdr *io = req->async_data; | |
257e84a5 PB |
6129 | |
6130 | kfree(io->free_iov); | |
0e1b6fe3 | 6131 | break; |
e8c2bc1f | 6132 | } |
0e1b6fe3 PB |
6133 | case IORING_OP_SPLICE: |
6134 | case IORING_OP_TEE: | |
e1d767f0 PB |
6135 | if (!(req->splice.flags & SPLICE_F_FD_IN_FIXED)) |
6136 | io_put_file(req->splice.file_in); | |
0e1b6fe3 | 6137 | break; |
f3cd4850 JA |
6138 | case IORING_OP_OPENAT: |
6139 | case IORING_OP_OPENAT2: | |
6140 | if (req->open.filename) | |
6141 | putname(req->open.filename); | |
6142 | break; | |
80a261fd JA |
6143 | case IORING_OP_RENAMEAT: |
6144 | putname(req->rename.oldpath); | |
6145 | putname(req->rename.newpath); | |
6146 | break; | |
14a1143b JA |
6147 | case IORING_OP_UNLINKAT: |
6148 | putname(req->unlink.filename); | |
6149 | break; | |
0e1b6fe3 | 6150 | } |
99bc4c38 | 6151 | } |
75652a30 JA |
6152 | if ((req->flags & REQ_F_POLLED) && req->apoll) { |
6153 | kfree(req->apoll->double_poll); | |
6154 | kfree(req->apoll); | |
6155 | req->apoll = NULL; | |
6156 | } | |
3a0a6902 PB |
6157 | if (req->flags & REQ_F_INFLIGHT) { |
6158 | struct io_uring_task *tctx = req->task->io_uring; | |
6159 | ||
6160 | atomic_dec(&tctx->inflight_tracked); | |
3a0a6902 | 6161 | } |
c854357b | 6162 | if (req->flags & REQ_F_CREDS) |
b8e64b53 | 6163 | put_cred(req->creds); |
c854357b PB |
6164 | |
6165 | req->flags &= ~IO_REQ_CLEAN_FLAGS; | |
99bc4c38 PB |
6166 | } |
6167 | ||
889fca73 | 6168 | static int io_issue_sqe(struct io_kiocb *req, unsigned int issue_flags) |
2b188cc1 | 6169 | { |
a197f664 | 6170 | struct io_ring_ctx *ctx = req->ctx; |
5730b27e | 6171 | const struct cred *creds = NULL; |
d625c6ee | 6172 | int ret; |
2b188cc1 | 6173 | |
b8e64b53 | 6174 | if ((req->flags & REQ_F_CREDS) && req->creds != current_cred()) |
c10d1f98 | 6175 | creds = override_creds(req->creds); |
5730b27e | 6176 | |
d625c6ee | 6177 | switch (req->opcode) { |
2b188cc1 | 6178 | case IORING_OP_NOP: |
889fca73 | 6179 | ret = io_nop(req, issue_flags); |
2b188cc1 JA |
6180 | break; |
6181 | case IORING_OP_READV: | |
edafccee | 6182 | case IORING_OP_READ_FIXED: |
3a6820f2 | 6183 | case IORING_OP_READ: |
889fca73 | 6184 | ret = io_read(req, issue_flags); |
edafccee | 6185 | break; |
3529d8c2 | 6186 | case IORING_OP_WRITEV: |
edafccee | 6187 | case IORING_OP_WRITE_FIXED: |
3a6820f2 | 6188 | case IORING_OP_WRITE: |
889fca73 | 6189 | ret = io_write(req, issue_flags); |
2b188cc1 | 6190 | break; |
c992fe29 | 6191 | case IORING_OP_FSYNC: |
45d189c6 | 6192 | ret = io_fsync(req, issue_flags); |
c992fe29 | 6193 | break; |
221c5eb2 | 6194 | case IORING_OP_POLL_ADD: |
61e98203 | 6195 | ret = io_poll_add(req, issue_flags); |
221c5eb2 JA |
6196 | break; |
6197 | case IORING_OP_POLL_REMOVE: | |
c5de0036 | 6198 | ret = io_poll_update(req, issue_flags); |
221c5eb2 | 6199 | break; |
5d17b4a4 | 6200 | case IORING_OP_SYNC_FILE_RANGE: |
45d189c6 | 6201 | ret = io_sync_file_range(req, issue_flags); |
5d17b4a4 | 6202 | break; |
0fa03c62 | 6203 | case IORING_OP_SENDMSG: |
889fca73 | 6204 | ret = io_sendmsg(req, issue_flags); |
062d04d7 | 6205 | break; |
fddaface | 6206 | case IORING_OP_SEND: |
889fca73 | 6207 | ret = io_send(req, issue_flags); |
0fa03c62 | 6208 | break; |
aa1fa28f | 6209 | case IORING_OP_RECVMSG: |
889fca73 | 6210 | ret = io_recvmsg(req, issue_flags); |
062d04d7 | 6211 | break; |
fddaface | 6212 | case IORING_OP_RECV: |
889fca73 | 6213 | ret = io_recv(req, issue_flags); |
aa1fa28f | 6214 | break; |
5262f567 | 6215 | case IORING_OP_TIMEOUT: |
61e98203 | 6216 | ret = io_timeout(req, issue_flags); |
5262f567 | 6217 | break; |
11365043 | 6218 | case IORING_OP_TIMEOUT_REMOVE: |
61e98203 | 6219 | ret = io_timeout_remove(req, issue_flags); |
11365043 | 6220 | break; |
17f2fe35 | 6221 | case IORING_OP_ACCEPT: |
889fca73 | 6222 | ret = io_accept(req, issue_flags); |
17f2fe35 | 6223 | break; |
f8e85cf2 | 6224 | case IORING_OP_CONNECT: |
889fca73 | 6225 | ret = io_connect(req, issue_flags); |
f8e85cf2 | 6226 | break; |
62755e35 | 6227 | case IORING_OP_ASYNC_CANCEL: |
61e98203 | 6228 | ret = io_async_cancel(req, issue_flags); |
62755e35 | 6229 | break; |
d63d1b5e | 6230 | case IORING_OP_FALLOCATE: |
45d189c6 | 6231 | ret = io_fallocate(req, issue_flags); |
d63d1b5e | 6232 | break; |
15b71abe | 6233 | case IORING_OP_OPENAT: |
45d189c6 | 6234 | ret = io_openat(req, issue_flags); |
15b71abe | 6235 | break; |
b5dba59e | 6236 | case IORING_OP_CLOSE: |
889fca73 | 6237 | ret = io_close(req, issue_flags); |
b5dba59e | 6238 | break; |
05f3fb3c | 6239 | case IORING_OP_FILES_UPDATE: |
889fca73 | 6240 | ret = io_files_update(req, issue_flags); |
05f3fb3c | 6241 | break; |
eddc7ef5 | 6242 | case IORING_OP_STATX: |
45d189c6 | 6243 | ret = io_statx(req, issue_flags); |
eddc7ef5 | 6244 | break; |
4840e418 | 6245 | case IORING_OP_FADVISE: |
45d189c6 | 6246 | ret = io_fadvise(req, issue_flags); |
4840e418 | 6247 | break; |
c1ca757b | 6248 | case IORING_OP_MADVISE: |
45d189c6 | 6249 | ret = io_madvise(req, issue_flags); |
c1ca757b | 6250 | break; |
cebdb986 | 6251 | case IORING_OP_OPENAT2: |
45d189c6 | 6252 | ret = io_openat2(req, issue_flags); |
cebdb986 | 6253 | break; |
3e4827b0 | 6254 | case IORING_OP_EPOLL_CTL: |
889fca73 | 6255 | ret = io_epoll_ctl(req, issue_flags); |
3e4827b0 | 6256 | break; |
7d67af2c | 6257 | case IORING_OP_SPLICE: |
45d189c6 | 6258 | ret = io_splice(req, issue_flags); |
7d67af2c | 6259 | break; |
ddf0322d | 6260 | case IORING_OP_PROVIDE_BUFFERS: |
889fca73 | 6261 | ret = io_provide_buffers(req, issue_flags); |
ddf0322d | 6262 | break; |
067524e9 | 6263 | case IORING_OP_REMOVE_BUFFERS: |
889fca73 | 6264 | ret = io_remove_buffers(req, issue_flags); |
3e4827b0 | 6265 | break; |
f2a8d5c7 | 6266 | case IORING_OP_TEE: |
45d189c6 | 6267 | ret = io_tee(req, issue_flags); |
f2a8d5c7 | 6268 | break; |
36f4fa68 | 6269 | case IORING_OP_SHUTDOWN: |
45d189c6 | 6270 | ret = io_shutdown(req, issue_flags); |
36f4fa68 | 6271 | break; |
80a261fd | 6272 | case IORING_OP_RENAMEAT: |
45d189c6 | 6273 | ret = io_renameat(req, issue_flags); |
80a261fd | 6274 | break; |
14a1143b | 6275 | case IORING_OP_UNLINKAT: |
45d189c6 | 6276 | ret = io_unlinkat(req, issue_flags); |
14a1143b | 6277 | break; |
2b188cc1 JA |
6278 | default: |
6279 | ret = -EINVAL; | |
6280 | break; | |
6281 | } | |
6282 | ||
5730b27e JA |
6283 | if (creds) |
6284 | revert_creds(creds); | |
def596e9 JA |
6285 | if (ret) |
6286 | return ret; | |
b532576e | 6287 | /* If the op doesn't have a file, we're not polling for it */ |
cb3d8972 PB |
6288 | if ((ctx->flags & IORING_SETUP_IOPOLL) && req->file) |
6289 | io_iopoll_req_issued(req); | |
def596e9 JA |
6290 | |
6291 | return 0; | |
2b188cc1 JA |
6292 | } |
6293 | ||
ebc11b6c PB |
6294 | static struct io_wq_work *io_wq_free_work(struct io_wq_work *work) |
6295 | { | |
6296 | struct io_kiocb *req = container_of(work, struct io_kiocb, work); | |
6297 | ||
6298 | req = io_put_req_find_next(req); | |
6299 | return req ? &req->work : NULL; | |
6300 | } | |
6301 | ||
5280f7e5 | 6302 | static void io_wq_submit_work(struct io_wq_work *work) |
2b188cc1 JA |
6303 | { |
6304 | struct io_kiocb *req = container_of(work, struct io_kiocb, work); | |
6df1db6b | 6305 | struct io_kiocb *timeout; |
561fb04a | 6306 | int ret = 0; |
2b188cc1 | 6307 | |
6df1db6b PB |
6308 | timeout = io_prep_linked_timeout(req); |
6309 | if (timeout) | |
6310 | io_queue_linked_timeout(timeout); | |
d4c81f38 | 6311 | |
4014d943 | 6312 | if (work->flags & IO_WQ_WORK_CANCEL) |
561fb04a | 6313 | ret = -ECANCELED; |
31b51510 | 6314 | |
561fb04a | 6315 | if (!ret) { |
561fb04a | 6316 | do { |
889fca73 | 6317 | ret = io_issue_sqe(req, 0); |
561fb04a JA |
6318 | /* |
6319 | * We can get EAGAIN for polled IO even though we're | |
6320 | * forcing a sync submission from here, since we can't | |
6321 | * wait for request slots on the block side. | |
6322 | */ | |
6323 | if (ret != -EAGAIN) | |
6324 | break; | |
6325 | cond_resched(); | |
6326 | } while (1); | |
6327 | } | |
31b51510 | 6328 | |
a3df7698 | 6329 | /* avoid locking problems by failing it from a clean context */ |
561fb04a | 6330 | if (ret) { |
a3df7698 | 6331 | /* io-wq is going to take one down */ |
de9b4cca | 6332 | req_ref_get(req); |
a3df7698 | 6333 | io_req_task_queue_fail(req, ret); |
edafccee | 6334 | } |
2b188cc1 JA |
6335 | } |
6336 | ||
aeca241b | 6337 | static inline struct io_fixed_file *io_fixed_file_slot(struct io_file_table *table, |
042b0d85 | 6338 | unsigned i) |
65e19f54 | 6339 | { |
042b0d85 | 6340 | return &table->files[i]; |
dafecf19 PB |
6341 | } |
6342 | ||
65e19f54 JA |
6343 | static inline struct file *io_file_from_index(struct io_ring_ctx *ctx, |
6344 | int index) | |
6345 | { | |
aeca241b | 6346 | struct io_fixed_file *slot = io_fixed_file_slot(&ctx->file_table, index); |
65e19f54 | 6347 | |
a04b0ac0 | 6348 | return (struct file *) (slot->file_ptr & FFS_MASK); |
65e19f54 JA |
6349 | } |
6350 | ||
a04b0ac0 | 6351 | static void io_fixed_file_set(struct io_fixed_file *file_slot, struct file *file) |
9a321c98 PB |
6352 | { |
6353 | unsigned long file_ptr = (unsigned long) file; | |
6354 | ||
b191e2df | 6355 | if (__io_file_supports_nowait(file, READ)) |
9a321c98 | 6356 | file_ptr |= FFS_ASYNC_READ; |
b191e2df | 6357 | if (__io_file_supports_nowait(file, WRITE)) |
9a321c98 PB |
6358 | file_ptr |= FFS_ASYNC_WRITE; |
6359 | if (S_ISREG(file_inode(file)->i_mode)) | |
6360 | file_ptr |= FFS_ISREG; | |
a04b0ac0 | 6361 | file_slot->file_ptr = file_ptr; |
65e19f54 JA |
6362 | } |
6363 | ||
ac177053 PB |
6364 | static inline struct file *io_file_get_fixed(struct io_ring_ctx *ctx, |
6365 | struct io_kiocb *req, int fd) | |
09bb8394 | 6366 | { |
8da11c19 | 6367 | struct file *file; |
ac177053 | 6368 | unsigned long file_ptr; |
09bb8394 | 6369 | |
ac177053 PB |
6370 | if (unlikely((unsigned int)fd >= ctx->nr_user_files)) |
6371 | return NULL; | |
6372 | fd = array_index_nospec(fd, ctx->nr_user_files); | |
6373 | file_ptr = io_fixed_file_slot(&ctx->file_table, fd)->file_ptr; | |
6374 | file = (struct file *) (file_ptr & FFS_MASK); | |
6375 | file_ptr &= ~FFS_MASK; | |
6376 | /* mask in overlapping REQ_F and FFS bits */ | |
b191e2df | 6377 | req->flags |= (file_ptr << REQ_F_NOWAIT_READ_BIT); |
ac177053 PB |
6378 | io_req_set_rsrc_node(req); |
6379 | return file; | |
6380 | } | |
d44f554e | 6381 | |
ac177053 PB |
6382 | static struct file *io_file_get_normal(struct io_ring_ctx *ctx, |
6383 | struct io_submit_state *state, | |
6384 | struct io_kiocb *req, int fd) | |
6385 | { | |
6386 | struct file *file = __io_file_get(state, fd); | |
6387 | ||
6388 | trace_io_uring_file_get(ctx, fd); | |
09bb8394 | 6389 | |
ac177053 PB |
6390 | /* we don't allow fixed io_uring files */ |
6391 | if (file && unlikely(file->f_op == &io_uring_fops)) | |
6392 | io_req_track_inflight(req); | |
8371adf5 | 6393 | return file; |
09bb8394 JA |
6394 | } |
6395 | ||
ac177053 PB |
6396 | static inline struct file *io_file_get(struct io_ring_ctx *ctx, |
6397 | struct io_submit_state *state, | |
6398 | struct io_kiocb *req, int fd, bool fixed) | |
6399 | { | |
6400 | if (fixed) | |
6401 | return io_file_get_fixed(ctx, req, fd); | |
6402 | else | |
6403 | return io_file_get_normal(ctx, state, req, fd); | |
6404 | } | |
6405 | ||
2665abfd | 6406 | static enum hrtimer_restart io_link_timeout_fn(struct hrtimer *timer) |
2b188cc1 | 6407 | { |
ad8a48ac JA |
6408 | struct io_timeout_data *data = container_of(timer, |
6409 | struct io_timeout_data, timer); | |
90cd7e42 | 6410 | struct io_kiocb *prev, *req = data->req; |
2665abfd | 6411 | struct io_ring_ctx *ctx = req->ctx; |
2665abfd | 6412 | unsigned long flags; |
2665abfd JA |
6413 | |
6414 | spin_lock_irqsave(&ctx->completion_lock, flags); | |
90cd7e42 PB |
6415 | prev = req->timeout.head; |
6416 | req->timeout.head = NULL; | |
2665abfd JA |
6417 | |
6418 | /* | |
6419 | * We don't expect the list to be empty, that will only happen if we | |
6420 | * race with the completion of the linked work. | |
6421 | */ | |
447c19f3 | 6422 | if (prev) { |
f2f87370 | 6423 | io_remove_next_linked(prev); |
447c19f3 PB |
6424 | if (!req_ref_inc_not_zero(prev)) |
6425 | prev = NULL; | |
6426 | } | |
2665abfd JA |
6427 | spin_unlock_irqrestore(&ctx->completion_lock, flags); |
6428 | ||
6429 | if (prev) { | |
014db007 | 6430 | io_async_find_and_cancel(ctx, req, prev->user_data, -ETIME); |
9ae1f8dd | 6431 | io_put_req_deferred(prev, 1); |
a298232e | 6432 | io_put_req_deferred(req, 1); |
47f46768 | 6433 | } else { |
9ae1f8dd | 6434 | io_req_complete_post(req, -ETIME, 0); |
2665abfd | 6435 | } |
2665abfd JA |
6436 | return HRTIMER_NORESTART; |
6437 | } | |
6438 | ||
de968c18 | 6439 | static void io_queue_linked_timeout(struct io_kiocb *req) |
2665abfd | 6440 | { |
de968c18 PB |
6441 | struct io_ring_ctx *ctx = req->ctx; |
6442 | ||
6443 | spin_lock_irq(&ctx->completion_lock); | |
76a46e06 | 6444 | /* |
f2f87370 PB |
6445 | * If the back reference is NULL, then our linked request finished |
6446 | * before we got a chance to setup the timer | |
76a46e06 | 6447 | */ |
90cd7e42 | 6448 | if (req->timeout.head) { |
e8c2bc1f | 6449 | struct io_timeout_data *data = req->async_data; |
94ae5e77 | 6450 | |
ad8a48ac JA |
6451 | data->timer.function = io_link_timeout_fn; |
6452 | hrtimer_start(&data->timer, timespec64_to_ktime(data->ts), | |
6453 | data->mode); | |
2665abfd | 6454 | } |
76a46e06 | 6455 | spin_unlock_irq(&ctx->completion_lock); |
2665abfd | 6456 | /* drop submission reference */ |
76a46e06 JA |
6457 | io_put_req(req); |
6458 | } | |
2665abfd | 6459 | |
ad8a48ac | 6460 | static struct io_kiocb *io_prep_linked_timeout(struct io_kiocb *req) |
2665abfd | 6461 | { |
f2f87370 | 6462 | struct io_kiocb *nxt = req->link; |
2665abfd | 6463 | |
f2f87370 PB |
6464 | if (!nxt || (req->flags & REQ_F_LINK_TIMEOUT) || |
6465 | nxt->opcode != IORING_OP_LINK_TIMEOUT) | |
76a46e06 | 6466 | return NULL; |
2665abfd | 6467 | |
90cd7e42 | 6468 | nxt->timeout.head = req; |
900fad45 | 6469 | nxt->flags |= REQ_F_LTIMEOUT_ACTIVE; |
76a46e06 | 6470 | req->flags |= REQ_F_LINK_TIMEOUT; |
76a46e06 | 6471 | return nxt; |
2665abfd JA |
6472 | } |
6473 | ||
c5eef2b9 | 6474 | static void __io_queue_sqe(struct io_kiocb *req) |
282cdc86 | 6475 | __must_hold(&req->ctx->uring_lock) |
2b188cc1 | 6476 | { |
d3d7298d | 6477 | struct io_kiocb *linked_timeout = io_prep_linked_timeout(req); |
e0c5c576 | 6478 | int ret; |
2b188cc1 | 6479 | |
59b735ae | 6480 | issue_sqe: |
c5eef2b9 | 6481 | ret = io_issue_sqe(req, IO_URING_F_NONBLOCK|IO_URING_F_COMPLETE_DEFER); |
193155c8 | 6482 | |
491381ce JA |
6483 | /* |
6484 | * We async punt it if the file wasn't marked NOWAIT, or if the file | |
6485 | * doesn't support non-blocking read/write attempts | |
6486 | */ | |
1840038e | 6487 | if (likely(!ret)) { |
0d63c148 | 6488 | /* drop submission reference */ |
e342c807 | 6489 | if (req->flags & REQ_F_COMPLETE_INLINE) { |
c5eef2b9 PB |
6490 | struct io_ring_ctx *ctx = req->ctx; |
6491 | struct io_comp_state *cs = &ctx->submit_state.comp; | |
e65ef56d | 6492 | |
6dd0be1e | 6493 | cs->reqs[cs->nr++] = req; |
d3d7298d | 6494 | if (cs->nr == ARRAY_SIZE(cs->reqs)) |
2a2758f2 | 6495 | io_submit_flush_completions(ctx); |
9affd664 | 6496 | } else { |
d3d7298d | 6497 | io_put_req(req); |
0d63c148 | 6498 | } |
1840038e | 6499 | } else if (ret == -EAGAIN && !(req->flags & REQ_F_NOWAIT)) { |
59b735ae OL |
6500 | switch (io_arm_poll_handler(req)) { |
6501 | case IO_APOLL_READY: | |
6502 | goto issue_sqe; | |
6503 | case IO_APOLL_ABORTED: | |
1840038e PB |
6504 | /* |
6505 | * Queued up for async execution, worker will release | |
6506 | * submit reference when the iocb is actually submitted. | |
6507 | */ | |
6508 | io_queue_async_work(req); | |
59b735ae | 6509 | break; |
1840038e | 6510 | } |
0d63c148 | 6511 | } else { |
f41db273 | 6512 | io_req_complete_failed(req, ret); |
9e645e11 | 6513 | } |
d3d7298d PB |
6514 | if (linked_timeout) |
6515 | io_queue_linked_timeout(linked_timeout); | |
2b188cc1 JA |
6516 | } |
6517 | ||
441b8a78 | 6518 | static inline void io_queue_sqe(struct io_kiocb *req) |
282cdc86 | 6519 | __must_hold(&req->ctx->uring_lock) |
4fe2c963 | 6520 | { |
10c66904 | 6521 | if (unlikely(req->ctx->drain_active) && io_drain_req(req)) |
76cc33d7 | 6522 | return; |
4fe2c963 | 6523 | |
76cc33d7 | 6524 | if (likely(!(req->flags & REQ_F_FORCE_ASYNC))) { |
c5eef2b9 | 6525 | __io_queue_sqe(req); |
76cc33d7 PB |
6526 | } else { |
6527 | int ret = io_req_prep_async(req); | |
6528 | ||
6529 | if (unlikely(ret)) | |
6530 | io_req_complete_failed(req, ret); | |
6531 | else | |
6532 | io_queue_async_work(req); | |
ce35a47a | 6533 | } |
4fe2c963 JL |
6534 | } |
6535 | ||
b16fed66 PB |
6536 | /* |
6537 | * Check SQE restrictions (opcode and flags). | |
6538 | * | |
6539 | * Returns 'true' if SQE is allowed, 'false' otherwise. | |
6540 | */ | |
6541 | static inline bool io_check_restriction(struct io_ring_ctx *ctx, | |
6542 | struct io_kiocb *req, | |
6543 | unsigned int sqe_flags) | |
4fe2c963 | 6544 | { |
4cfb25bf | 6545 | if (likely(!ctx->restricted)) |
b16fed66 PB |
6546 | return true; |
6547 | ||
6548 | if (!test_bit(req->opcode, ctx->restrictions.sqe_op)) | |
6549 | return false; | |
6550 | ||
6551 | if ((sqe_flags & ctx->restrictions.sqe_flags_required) != | |
6552 | ctx->restrictions.sqe_flags_required) | |
6553 | return false; | |
6554 | ||
6555 | if (sqe_flags & ~(ctx->restrictions.sqe_flags_allowed | | |
6556 | ctx->restrictions.sqe_flags_required)) | |
6557 | return false; | |
6558 | ||
6559 | return true; | |
4fe2c963 JL |
6560 | } |
6561 | ||
b16fed66 PB |
6562 | static int io_init_req(struct io_ring_ctx *ctx, struct io_kiocb *req, |
6563 | const struct io_uring_sqe *sqe) | |
282cdc86 | 6564 | __must_hold(&ctx->uring_lock) |
b16fed66 PB |
6565 | { |
6566 | struct io_submit_state *state; | |
6567 | unsigned int sqe_flags; | |
003e8dcc | 6568 | int personality, ret = 0; |
b16fed66 | 6569 | |
864ea921 | 6570 | /* req is partially pre-initialised, see io_preinit_req() */ |
b16fed66 PB |
6571 | req->opcode = READ_ONCE(sqe->opcode); |
6572 | /* same numerical values with corresponding REQ_F_*, safe to copy */ | |
6573 | req->flags = sqe_flags = READ_ONCE(sqe->flags); | |
6574 | req->user_data = READ_ONCE(sqe->user_data); | |
b16fed66 | 6575 | req->file = NULL; |
b16fed66 PB |
6576 | req->fixed_rsrc_refs = NULL; |
6577 | /* one is dropped after submission, the other at completion */ | |
abc54d63 | 6578 | atomic_set(&req->refs, 2); |
b16fed66 | 6579 | req->task = current; |
b16fed66 PB |
6580 | |
6581 | /* enforce forwards compatibility on users */ | |
dddca226 | 6582 | if (unlikely(sqe_flags & ~SQE_VALID_FLAGS)) |
b16fed66 | 6583 | return -EINVAL; |
b16fed66 PB |
6584 | if (unlikely(req->opcode >= IORING_OP_LAST)) |
6585 | return -EINVAL; | |
4cfb25bf | 6586 | if (!io_check_restriction(ctx, req, sqe_flags)) |
b16fed66 PB |
6587 | return -EACCES; |
6588 | ||
6589 | if ((sqe_flags & IOSQE_BUFFER_SELECT) && | |
6590 | !io_op_defs[req->opcode].buffer_select) | |
6591 | return -EOPNOTSUPP; | |
3c19966d PB |
6592 | if (unlikely(sqe_flags & IOSQE_IO_DRAIN)) |
6593 | ctx->drain_active = true; | |
863e0560 | 6594 | |
003e8dcc JA |
6595 | personality = READ_ONCE(sqe->personality); |
6596 | if (personality) { | |
c10d1f98 PB |
6597 | req->creds = xa_load(&ctx->personalities, personality); |
6598 | if (!req->creds) | |
003e8dcc | 6599 | return -EINVAL; |
c10d1f98 | 6600 | get_cred(req->creds); |
b8e64b53 | 6601 | req->flags |= REQ_F_CREDS; |
003e8dcc | 6602 | } |
b16fed66 PB |
6603 | state = &ctx->submit_state; |
6604 | ||
6605 | /* | |
6606 | * Plug now if we have more than 1 IO left after this, and the target | |
6607 | * is potentially a read/write to block based storage. | |
6608 | */ | |
6609 | if (!state->plug_started && state->ios_left > 1 && | |
6610 | io_op_defs[req->opcode].plug) { | |
6611 | blk_start_plug(&state->plug); | |
6612 | state->plug_started = true; | |
6613 | } | |
6614 | ||
6615 | if (io_op_defs[req->opcode].needs_file) { | |
ac177053 PB |
6616 | req->file = io_file_get(ctx, state, req, READ_ONCE(sqe->fd), |
6617 | (sqe_flags & IOSQE_FIXED_FILE)); | |
b16fed66 PB |
6618 | if (unlikely(!req->file)) |
6619 | ret = -EBADF; | |
6620 | } | |
6621 | ||
6622 | state->ios_left--; | |
6623 | return ret; | |
6624 | } | |
6625 | ||
a6b8cadc | 6626 | static int io_submit_sqe(struct io_ring_ctx *ctx, struct io_kiocb *req, |
a1ab7b35 | 6627 | const struct io_uring_sqe *sqe) |
282cdc86 | 6628 | __must_hold(&ctx->uring_lock) |
9e645e11 | 6629 | { |
a1ab7b35 | 6630 | struct io_submit_link *link = &ctx->submit_state.link; |
ef4ff581 | 6631 | int ret; |
9e645e11 | 6632 | |
a6b8cadc PB |
6633 | ret = io_init_req(ctx, req, sqe); |
6634 | if (unlikely(ret)) { | |
6635 | fail_req: | |
de59bc10 PB |
6636 | if (link->head) { |
6637 | /* fail even hard links since we don't submit */ | |
93d2bcd2 | 6638 | req_set_fail(link->head); |
f41db273 | 6639 | io_req_complete_failed(link->head, -ECANCELED); |
de59bc10 PB |
6640 | link->head = NULL; |
6641 | } | |
f41db273 | 6642 | io_req_complete_failed(req, ret); |
a6b8cadc PB |
6643 | return ret; |
6644 | } | |
441b8a78 | 6645 | |
be7053b7 PB |
6646 | ret = io_req_prep(req, sqe); |
6647 | if (unlikely(ret)) | |
6648 | goto fail_req; | |
a6b8cadc | 6649 | |
be7053b7 | 6650 | /* don't need @sqe from now on */ |
236daeae OL |
6651 | trace_io_uring_submit_sqe(ctx, req, req->opcode, req->user_data, |
6652 | req->flags, true, | |
6653 | ctx->flags & IORING_SETUP_SQPOLL); | |
a6b8cadc | 6654 | |
9e645e11 JA |
6655 | /* |
6656 | * If we already have a head request, queue this one for async | |
6657 | * submittal once the head completes. If we don't have a head but | |
6658 | * IOSQE_IO_LINK is set in the sqe, start a new head. This one will be | |
6659 | * submitted sync once the chain is complete. If none of those | |
6660 | * conditions are true (normal request), then just queue it. | |
6661 | */ | |
863e0560 PB |
6662 | if (link->head) { |
6663 | struct io_kiocb *head = link->head; | |
4e88d6e7 | 6664 | |
b7e298d2 | 6665 | ret = io_req_prep_async(req); |
cf109604 | 6666 | if (unlikely(ret)) |
a6b8cadc | 6667 | goto fail_req; |
9d76377f | 6668 | trace_io_uring_link(ctx, req, head); |
f2f87370 | 6669 | link->last->link = req; |
863e0560 | 6670 | link->last = req; |
32fe525b PB |
6671 | |
6672 | /* last request of a link, enqueue the link */ | |
ef4ff581 | 6673 | if (!(req->flags & (REQ_F_LINK | REQ_F_HARDLINK))) { |
863e0560 | 6674 | link->head = NULL; |
5e159204 | 6675 | io_queue_sqe(head); |
32fe525b | 6676 | } |
9e645e11 | 6677 | } else { |
ef4ff581 | 6678 | if (req->flags & (REQ_F_LINK | REQ_F_HARDLINK)) { |
863e0560 PB |
6679 | link->head = req; |
6680 | link->last = req; | |
711be031 | 6681 | } else { |
be7053b7 | 6682 | io_queue_sqe(req); |
711be031 | 6683 | } |
9e645e11 | 6684 | } |
2e6e1fde | 6685 | |
1d4240cc | 6686 | return 0; |
9e645e11 JA |
6687 | } |
6688 | ||
9a56a232 JA |
6689 | /* |
6690 | * Batched submission is done, ensure local IO is flushed out. | |
6691 | */ | |
ba88ff11 PB |
6692 | static void io_submit_state_end(struct io_submit_state *state, |
6693 | struct io_ring_ctx *ctx) | |
9a56a232 | 6694 | { |
a1ab7b35 | 6695 | if (state->link.head) |
de59bc10 | 6696 | io_queue_sqe(state->link.head); |
6dd0be1e | 6697 | if (state->comp.nr) |
2a2758f2 | 6698 | io_submit_flush_completions(ctx); |
27926b68 JA |
6699 | if (state->plug_started) |
6700 | blk_finish_plug(&state->plug); | |
9f13c35b | 6701 | io_state_file_put(state); |
9a56a232 JA |
6702 | } |
6703 | ||
6704 | /* | |
6705 | * Start submission side cache. | |
6706 | */ | |
6707 | static void io_submit_state_start(struct io_submit_state *state, | |
ba88ff11 | 6708 | unsigned int max_ios) |
9a56a232 | 6709 | { |
27926b68 | 6710 | state->plug_started = false; |
9a56a232 | 6711 | state->ios_left = max_ios; |
a1ab7b35 PB |
6712 | /* set only head, no need to init link_last in advance */ |
6713 | state->link.head = NULL; | |
9a56a232 JA |
6714 | } |
6715 | ||
2b188cc1 JA |
6716 | static void io_commit_sqring(struct io_ring_ctx *ctx) |
6717 | { | |
75b28aff | 6718 | struct io_rings *rings = ctx->rings; |
2b188cc1 | 6719 | |
caf582c6 PB |
6720 | /* |
6721 | * Ensure any loads from the SQEs are done at this point, | |
6722 | * since once we write the new head, the application could | |
6723 | * write new data to them. | |
6724 | */ | |
6725 | smp_store_release(&rings->sq.head, ctx->cached_sq_head); | |
2b188cc1 JA |
6726 | } |
6727 | ||
2b188cc1 | 6728 | /* |
dd9ae8a0 | 6729 | * Fetch an sqe, if one is available. Note this returns a pointer to memory |
2b188cc1 JA |
6730 | * that is mapped by userspace. This means that care needs to be taken to |
6731 | * ensure that reads are stable, as we cannot rely on userspace always | |
6732 | * being a good citizen. If members of the sqe are validated and then later | |
6733 | * used, it's important that those reads are done through READ_ONCE() to | |
6734 | * prevent a re-load down the line. | |
6735 | */ | |
709b302f | 6736 | static const struct io_uring_sqe *io_get_sqe(struct io_ring_ctx *ctx) |
2b188cc1 | 6737 | { |
ea5ab3b5 | 6738 | unsigned head, mask = ctx->sq_entries - 1; |
17d3aeb3 | 6739 | unsigned sq_idx = ctx->cached_sq_head++ & mask; |
2b188cc1 JA |
6740 | |
6741 | /* | |
6742 | * The cached sq head (or cq tail) serves two purposes: | |
6743 | * | |
6744 | * 1) allows us to batch the cost of updating the user visible | |
6745 | * head updates. | |
6746 | * 2) allows the kernel side to track the head on its own, even | |
6747 | * though the application is the one updating it. | |
6748 | */ | |
17d3aeb3 | 6749 | head = READ_ONCE(ctx->sq_array[sq_idx]); |
709b302f PB |
6750 | if (likely(head < ctx->sq_entries)) |
6751 | return &ctx->sq_sqes[head]; | |
2b188cc1 JA |
6752 | |
6753 | /* drop invalid entries */ | |
15641e42 PB |
6754 | ctx->cq_extra--; |
6755 | WRITE_ONCE(ctx->rings->sq_dropped, | |
6756 | READ_ONCE(ctx->rings->sq_dropped) + 1); | |
709b302f PB |
6757 | return NULL; |
6758 | } | |
6759 | ||
0f212204 | 6760 | static int io_submit_sqes(struct io_ring_ctx *ctx, unsigned int nr) |
282cdc86 | 6761 | __must_hold(&ctx->uring_lock) |
6c271ce2 | 6762 | { |
09899b19 | 6763 | struct io_uring_task *tctx; |
46c4e16a | 6764 | int submitted = 0; |
6c271ce2 | 6765 | |
ee7d46d9 PB |
6766 | /* make sure SQ entry isn't read before tail */ |
6767 | nr = min3(nr, ctx->sq_entries, io_sqring_entries(ctx)); | |
2b85edfc PB |
6768 | if (!percpu_ref_tryget_many(&ctx->refs, nr)) |
6769 | return -EAGAIN; | |
6c271ce2 | 6770 | |
09899b19 PB |
6771 | tctx = current->io_uring; |
6772 | tctx->cached_refs -= nr; | |
6773 | if (unlikely(tctx->cached_refs < 0)) { | |
6774 | unsigned int refill = -tctx->cached_refs + IO_TCTX_REFS_CACHE_NR; | |
6775 | ||
6776 | percpu_counter_add(&tctx->inflight, refill); | |
6777 | refcount_add(refill, ¤t->usage); | |
6778 | tctx->cached_refs += refill; | |
6779 | } | |
ba88ff11 | 6780 | io_submit_state_start(&ctx->submit_state, nr); |
b14cca0c | 6781 | |
46c4e16a | 6782 | while (submitted < nr) { |
3529d8c2 | 6783 | const struct io_uring_sqe *sqe; |
196be95c | 6784 | struct io_kiocb *req; |
fb5ccc98 | 6785 | |
258b29a9 | 6786 | req = io_alloc_req(ctx); |
196be95c PB |
6787 | if (unlikely(!req)) { |
6788 | if (!submitted) | |
6789 | submitted = -EAGAIN; | |
fb5ccc98 | 6790 | break; |
196be95c | 6791 | } |
4fccfcbb PB |
6792 | sqe = io_get_sqe(ctx); |
6793 | if (unlikely(!sqe)) { | |
6794 | kmem_cache_free(req_cachep, req); | |
6795 | break; | |
6796 | } | |
d3656344 JA |
6797 | /* will complete beyond this point, count as submitted */ |
6798 | submitted++; | |
a1ab7b35 | 6799 | if (io_submit_sqe(ctx, req, sqe)) |
196be95c | 6800 | break; |
6c271ce2 JA |
6801 | } |
6802 | ||
9466f437 PB |
6803 | if (unlikely(submitted != nr)) { |
6804 | int ref_used = (submitted == -EAGAIN) ? 0 : submitted; | |
d8a6df10 | 6805 | int unused = nr - ref_used; |
9466f437 | 6806 | |
09899b19 | 6807 | current->io_uring->cached_refs += unused; |
d8a6df10 | 6808 | percpu_ref_put_many(&ctx->refs, unused); |
9466f437 | 6809 | } |
6c271ce2 | 6810 | |
a1ab7b35 | 6811 | io_submit_state_end(&ctx->submit_state, ctx); |
ae9428ca PB |
6812 | /* Commit SQ ring head once we've consumed and submitted all SQEs */ |
6813 | io_commit_sqring(ctx); | |
6814 | ||
6c271ce2 JA |
6815 | return submitted; |
6816 | } | |
6817 | ||
e4b6d902 PB |
6818 | static inline bool io_sqd_events_pending(struct io_sq_data *sqd) |
6819 | { | |
6820 | return READ_ONCE(sqd->state); | |
6821 | } | |
6822 | ||
23b3628e XW |
6823 | static inline void io_ring_set_wakeup_flag(struct io_ring_ctx *ctx) |
6824 | { | |
6825 | /* Tell userspace we may need a wakeup call */ | |
6826 | spin_lock_irq(&ctx->completion_lock); | |
20c0b380 NA |
6827 | WRITE_ONCE(ctx->rings->sq_flags, |
6828 | ctx->rings->sq_flags | IORING_SQ_NEED_WAKEUP); | |
23b3628e XW |
6829 | spin_unlock_irq(&ctx->completion_lock); |
6830 | } | |
6831 | ||
6832 | static inline void io_ring_clear_wakeup_flag(struct io_ring_ctx *ctx) | |
6833 | { | |
6834 | spin_lock_irq(&ctx->completion_lock); | |
20c0b380 NA |
6835 | WRITE_ONCE(ctx->rings->sq_flags, |
6836 | ctx->rings->sq_flags & ~IORING_SQ_NEED_WAKEUP); | |
23b3628e XW |
6837 | spin_unlock_irq(&ctx->completion_lock); |
6838 | } | |
6839 | ||
08369246 | 6840 | static int __io_sq_thread(struct io_ring_ctx *ctx, bool cap_entries) |
6c271ce2 | 6841 | { |
c8d1ba58 | 6842 | unsigned int to_submit; |
bdcd3eab | 6843 | int ret = 0; |
6c271ce2 | 6844 | |
c8d1ba58 | 6845 | to_submit = io_sqring_entries(ctx); |
e95eee2d | 6846 | /* if we're handling multiple rings, cap submit size for fairness */ |
4ce8ad95 OL |
6847 | if (cap_entries && to_submit > IORING_SQPOLL_CAP_ENTRIES_VALUE) |
6848 | to_submit = IORING_SQPOLL_CAP_ENTRIES_VALUE; | |
e95eee2d | 6849 | |
906a3c6f | 6850 | if (!list_empty(&ctx->iopoll_list) || to_submit) { |
c8d1ba58 | 6851 | unsigned nr_events = 0; |
948e1947 PB |
6852 | const struct cred *creds = NULL; |
6853 | ||
6854 | if (ctx->sq_creds != current_cred()) | |
6855 | creds = override_creds(ctx->sq_creds); | |
a4c0b3de | 6856 | |
c8d1ba58 | 6857 | mutex_lock(&ctx->uring_lock); |
906a3c6f | 6858 | if (!list_empty(&ctx->iopoll_list)) |
3c30ef0f | 6859 | io_do_iopoll(ctx, &nr_events, 0, true); |
906a3c6f | 6860 | |
3b763ba1 PB |
6861 | /* |
6862 | * Don't submit if refs are dying, good for io_uring_register(), | |
6863 | * but also it is relied upon by io_ring_exit_work() | |
6864 | */ | |
0298ef96 PB |
6865 | if (to_submit && likely(!percpu_ref_is_dying(&ctx->refs)) && |
6866 | !(ctx->flags & IORING_SETUP_R_DISABLED)) | |
08369246 | 6867 | ret = io_submit_sqes(ctx, to_submit); |
c8d1ba58 | 6868 | mutex_unlock(&ctx->uring_lock); |
6c271ce2 | 6869 | |
acfb381d PB |
6870 | if (to_submit && wq_has_sleeper(&ctx->sqo_sq_wait)) |
6871 | wake_up(&ctx->sqo_sq_wait); | |
948e1947 PB |
6872 | if (creds) |
6873 | revert_creds(creds); | |
acfb381d | 6874 | } |
6c271ce2 | 6875 | |
08369246 XW |
6876 | return ret; |
6877 | } | |
6c271ce2 | 6878 | |
08369246 XW |
6879 | static void io_sqd_update_thread_idle(struct io_sq_data *sqd) |
6880 | { | |
6881 | struct io_ring_ctx *ctx; | |
6882 | unsigned sq_thread_idle = 0; | |
6c271ce2 | 6883 | |
c9dca27d PB |
6884 | list_for_each_entry(ctx, &sqd->ctx_list, sqd_list) |
6885 | sq_thread_idle = max(sq_thread_idle, ctx->sq_thread_idle); | |
08369246 | 6886 | sqd->sq_thread_idle = sq_thread_idle; |
c8d1ba58 | 6887 | } |
6c271ce2 | 6888 | |
e4b6d902 PB |
6889 | static bool io_sqd_handle_event(struct io_sq_data *sqd) |
6890 | { | |
6891 | bool did_sig = false; | |
6892 | struct ksignal ksig; | |
6893 | ||
6894 | if (test_bit(IO_SQ_THREAD_SHOULD_PARK, &sqd->state) || | |
6895 | signal_pending(current)) { | |
6896 | mutex_unlock(&sqd->lock); | |
6897 | if (signal_pending(current)) | |
6898 | did_sig = get_signal(&ksig); | |
6899 | cond_resched(); | |
6900 | mutex_lock(&sqd->lock); | |
6901 | } | |
e4b6d902 PB |
6902 | return did_sig || test_bit(IO_SQ_THREAD_SHOULD_STOP, &sqd->state); |
6903 | } | |
6904 | ||
c8d1ba58 JA |
6905 | static int io_sq_thread(void *data) |
6906 | { | |
69fb2131 JA |
6907 | struct io_sq_data *sqd = data; |
6908 | struct io_ring_ctx *ctx; | |
a0d9205f | 6909 | unsigned long timeout = 0; |
37d1e2e3 | 6910 | char buf[TASK_COMM_LEN]; |
08369246 | 6911 | DEFINE_WAIT(wait); |
6c271ce2 | 6912 | |
696ee88a | 6913 | snprintf(buf, sizeof(buf), "iou-sqp-%d", sqd->task_pid); |
37d1e2e3 | 6914 | set_task_comm(current, buf); |
37d1e2e3 JA |
6915 | |
6916 | if (sqd->sq_cpu != -1) | |
6917 | set_cpus_allowed_ptr(current, cpumask_of(sqd->sq_cpu)); | |
6918 | else | |
6919 | set_cpus_allowed_ptr(current, cpu_online_mask); | |
6920 | current->flags |= PF_NO_SETAFFINITY; | |
6921 | ||
09a6f4ef | 6922 | mutex_lock(&sqd->lock); |
e4b6d902 | 6923 | while (1) { |
1a924a80 | 6924 | bool cap_entries, sqt_spin = false; |
c1edbf5f | 6925 | |
e4b6d902 PB |
6926 | if (io_sqd_events_pending(sqd) || signal_pending(current)) { |
6927 | if (io_sqd_handle_event(sqd)) | |
c7d95613 | 6928 | break; |
08369246 XW |
6929 | timeout = jiffies + sqd->sq_thread_idle; |
6930 | } | |
e4b6d902 | 6931 | |
e95eee2d | 6932 | cap_entries = !list_is_singular(&sqd->ctx_list); |
69fb2131 | 6933 | list_for_each_entry(ctx, &sqd->ctx_list, sqd_list) { |
948e1947 | 6934 | int ret = __io_sq_thread(ctx, cap_entries); |
7c30f36a | 6935 | |
08369246 XW |
6936 | if (!sqt_spin && (ret > 0 || !list_empty(&ctx->iopoll_list))) |
6937 | sqt_spin = true; | |
69fb2131 | 6938 | } |
dd432ea5 PB |
6939 | if (io_run_task_work()) |
6940 | sqt_spin = true; | |
6c271ce2 | 6941 | |
08369246 | 6942 | if (sqt_spin || !time_after(jiffies, timeout)) { |
c8d1ba58 | 6943 | cond_resched(); |
08369246 XW |
6944 | if (sqt_spin) |
6945 | timeout = jiffies + sqd->sq_thread_idle; | |
6946 | continue; | |
6947 | } | |
6948 | ||
08369246 | 6949 | prepare_to_wait(&sqd->wait, &wait, TASK_INTERRUPTIBLE); |
dd432ea5 | 6950 | if (!io_sqd_events_pending(sqd) && !current->task_works) { |
1a924a80 PB |
6951 | bool needs_sched = true; |
6952 | ||
724cb4f9 | 6953 | list_for_each_entry(ctx, &sqd->ctx_list, sqd_list) { |
aaa9f0f4 PB |
6954 | io_ring_set_wakeup_flag(ctx); |
6955 | ||
724cb4f9 HX |
6956 | if ((ctx->flags & IORING_SETUP_IOPOLL) && |
6957 | !list_empty_careful(&ctx->iopoll_list)) { | |
6958 | needs_sched = false; | |
6959 | break; | |
6960 | } | |
6961 | if (io_sqring_entries(ctx)) { | |
6962 | needs_sched = false; | |
6963 | break; | |
6964 | } | |
6965 | } | |
6966 | ||
6967 | if (needs_sched) { | |
6968 | mutex_unlock(&sqd->lock); | |
6969 | schedule(); | |
6970 | mutex_lock(&sqd->lock); | |
6971 | } | |
69fb2131 JA |
6972 | list_for_each_entry(ctx, &sqd->ctx_list, sqd_list) |
6973 | io_ring_clear_wakeup_flag(ctx); | |
6c271ce2 | 6974 | } |
08369246 XW |
6975 | |
6976 | finish_wait(&sqd->wait, &wait); | |
6977 | timeout = jiffies + sqd->sq_thread_idle; | |
6c271ce2 | 6978 | } |
28cea78a | 6979 | |
78cc687b | 6980 | io_uring_cancel_generic(true, sqd); |
37d1e2e3 | 6981 | sqd->thread = NULL; |
05962f95 | 6982 | list_for_each_entry(ctx, &sqd->ctx_list, sqd_list) |
5f3f26f9 | 6983 | io_ring_set_wakeup_flag(ctx); |
521d6a73 | 6984 | io_run_task_work(); |
734551df PB |
6985 | mutex_unlock(&sqd->lock); |
6986 | ||
37d1e2e3 JA |
6987 | complete(&sqd->exited); |
6988 | do_exit(0); | |
6c271ce2 JA |
6989 | } |
6990 | ||
bda52162 JA |
6991 | struct io_wait_queue { |
6992 | struct wait_queue_entry wq; | |
6993 | struct io_ring_ctx *ctx; | |
5fd46178 | 6994 | unsigned cq_tail; |
bda52162 JA |
6995 | unsigned nr_timeouts; |
6996 | }; | |
6997 | ||
6c503150 | 6998 | static inline bool io_should_wake(struct io_wait_queue *iowq) |
bda52162 JA |
6999 | { |
7000 | struct io_ring_ctx *ctx = iowq->ctx; | |
5fd46178 | 7001 | int dist = ctx->cached_cq_tail - (int) iowq->cq_tail; |
bda52162 JA |
7002 | |
7003 | /* | |
d195a66e | 7004 | * Wake up if we have enough events, or if a timeout occurred since we |
bda52162 JA |
7005 | * started waiting. For timeouts, we always want to return to userspace, |
7006 | * regardless of event count. | |
7007 | */ | |
5fd46178 | 7008 | return dist >= 0 || atomic_read(&ctx->cq_timeouts) != iowq->nr_timeouts; |
bda52162 JA |
7009 | } |
7010 | ||
7011 | static int io_wake_function(struct wait_queue_entry *curr, unsigned int mode, | |
7012 | int wake_flags, void *key) | |
7013 | { | |
7014 | struct io_wait_queue *iowq = container_of(curr, struct io_wait_queue, | |
7015 | wq); | |
7016 | ||
6c503150 PB |
7017 | /* |
7018 | * Cannot safely flush overflowed CQEs from here, ensure we wake up | |
7019 | * the task, and the next invocation will do it. | |
7020 | */ | |
5ed7a37d | 7021 | if (io_should_wake(iowq) || test_bit(0, &iowq->ctx->check_cq_overflow)) |
6c503150 PB |
7022 | return autoremove_wake_function(curr, mode, wake_flags, key); |
7023 | return -1; | |
bda52162 JA |
7024 | } |
7025 | ||
af9c1a44 JA |
7026 | static int io_run_task_work_sig(void) |
7027 | { | |
7028 | if (io_run_task_work()) | |
7029 | return 1; | |
7030 | if (!signal_pending(current)) | |
7031 | return 0; | |
0b8cfa97 | 7032 | if (test_thread_flag(TIF_NOTIFY_SIGNAL)) |
792ee0f6 | 7033 | return -ERESTARTSYS; |
af9c1a44 JA |
7034 | return -EINTR; |
7035 | } | |
7036 | ||
eeb60b9a PB |
7037 | /* when returns >0, the caller should retry */ |
7038 | static inline int io_cqring_wait_schedule(struct io_ring_ctx *ctx, | |
7039 | struct io_wait_queue *iowq, | |
7040 | signed long *timeout) | |
7041 | { | |
7042 | int ret; | |
7043 | ||
7044 | /* make sure we run task_work before checking for signals */ | |
7045 | ret = io_run_task_work_sig(); | |
7046 | if (ret || io_should_wake(iowq)) | |
7047 | return ret; | |
7048 | /* let the caller flush overflows, retry */ | |
5ed7a37d | 7049 | if (test_bit(0, &ctx->check_cq_overflow)) |
eeb60b9a PB |
7050 | return 1; |
7051 | ||
7052 | *timeout = schedule_timeout(*timeout); | |
7053 | return !*timeout ? -ETIME : 1; | |
7054 | } | |
7055 | ||
2b188cc1 JA |
7056 | /* |
7057 | * Wait until events become available, if we don't already have some. The | |
7058 | * application must reap them itself, as they reside on the shared cq ring. | |
7059 | */ | |
7060 | static int io_cqring_wait(struct io_ring_ctx *ctx, int min_events, | |
c73ebb68 HX |
7061 | const sigset_t __user *sig, size_t sigsz, |
7062 | struct __kernel_timespec __user *uts) | |
2b188cc1 | 7063 | { |
90291099 | 7064 | struct io_wait_queue iowq; |
75b28aff | 7065 | struct io_rings *rings = ctx->rings; |
c1d5a224 PB |
7066 | signed long timeout = MAX_SCHEDULE_TIMEOUT; |
7067 | int ret; | |
2b188cc1 | 7068 | |
b41e9852 | 7069 | do { |
6c2450ae | 7070 | io_cqring_overflow_flush(ctx, false); |
6c503150 | 7071 | if (io_cqring_events(ctx) >= min_events) |
b41e9852 | 7072 | return 0; |
4c6e277c | 7073 | if (!io_run_task_work()) |
b41e9852 | 7074 | break; |
b41e9852 | 7075 | } while (1); |
2b188cc1 JA |
7076 | |
7077 | if (sig) { | |
9e75ad5d AB |
7078 | #ifdef CONFIG_COMPAT |
7079 | if (in_compat_syscall()) | |
7080 | ret = set_compat_user_sigmask((const compat_sigset_t __user *)sig, | |
b772434b | 7081 | sigsz); |
9e75ad5d AB |
7082 | else |
7083 | #endif | |
b772434b | 7084 | ret = set_user_sigmask(sig, sigsz); |
9e75ad5d | 7085 | |
2b188cc1 JA |
7086 | if (ret) |
7087 | return ret; | |
7088 | } | |
7089 | ||
c73ebb68 | 7090 | if (uts) { |
c1d5a224 PB |
7091 | struct timespec64 ts; |
7092 | ||
c73ebb68 HX |
7093 | if (get_timespec64(&ts, uts)) |
7094 | return -EFAULT; | |
7095 | timeout = timespec64_to_jiffies(&ts); | |
7096 | } | |
7097 | ||
90291099 PB |
7098 | init_waitqueue_func_entry(&iowq.wq, io_wake_function); |
7099 | iowq.wq.private = current; | |
7100 | INIT_LIST_HEAD(&iowq.wq.entry); | |
7101 | iowq.ctx = ctx; | |
bda52162 | 7102 | iowq.nr_timeouts = atomic_read(&ctx->cq_timeouts); |
5fd46178 | 7103 | iowq.cq_tail = READ_ONCE(ctx->rings->cq.head) + min_events; |
90291099 | 7104 | |
c826bd7a | 7105 | trace_io_uring_cqring_wait(ctx, min_events); |
bda52162 | 7106 | do { |
ca0a2651 | 7107 | /* if we can't even flush overflow, don't wait for more */ |
6c2450ae | 7108 | if (!io_cqring_overflow_flush(ctx, false)) { |
ca0a2651 JA |
7109 | ret = -EBUSY; |
7110 | break; | |
7111 | } | |
311997b3 | 7112 | prepare_to_wait_exclusive(&ctx->cq_wait, &iowq.wq, |
bda52162 | 7113 | TASK_INTERRUPTIBLE); |
eeb60b9a | 7114 | ret = io_cqring_wait_schedule(ctx, &iowq, &timeout); |
311997b3 | 7115 | finish_wait(&ctx->cq_wait, &iowq.wq); |
ca0a2651 | 7116 | cond_resched(); |
eeb60b9a | 7117 | } while (ret > 0); |
bda52162 | 7118 | |
b7db41c9 | 7119 | restore_saved_sigmask_unless(ret == -EINTR); |
2b188cc1 | 7120 | |
75b28aff | 7121 | return READ_ONCE(rings->cq.head) == READ_ONCE(rings->cq.tail) ? ret : 0; |
2b188cc1 JA |
7122 | } |
7123 | ||
9123c8ff | 7124 | static void io_free_page_table(void **table, size_t size) |
05f3fb3c | 7125 | { |
9123c8ff | 7126 | unsigned i, nr_tables = DIV_ROUND_UP(size, PAGE_SIZE); |
05f3fb3c | 7127 | |
846a4ef2 | 7128 | for (i = 0; i < nr_tables; i++) |
9123c8ff PB |
7129 | kfree(table[i]); |
7130 | kfree(table); | |
7131 | } | |
7132 | ||
7133 | static void **io_alloc_page_table(size_t size) | |
7134 | { | |
7135 | unsigned i, nr_tables = DIV_ROUND_UP(size, PAGE_SIZE); | |
7136 | size_t init_size = size; | |
7137 | void **table; | |
7138 | ||
7139 | table = kcalloc(nr_tables, sizeof(*table), GFP_KERNEL); | |
7140 | if (!table) | |
7141 | return NULL; | |
7142 | ||
7143 | for (i = 0; i < nr_tables; i++) { | |
27f6b318 | 7144 | unsigned int this_size = min_t(size_t, size, PAGE_SIZE); |
9123c8ff PB |
7145 | |
7146 | table[i] = kzalloc(this_size, GFP_KERNEL); | |
7147 | if (!table[i]) { | |
7148 | io_free_page_table(table, init_size); | |
7149 | return NULL; | |
7150 | } | |
7151 | size -= this_size; | |
7152 | } | |
7153 | return table; | |
05f3fb3c JA |
7154 | } |
7155 | ||
28a9fe25 | 7156 | static void io_rsrc_node_destroy(struct io_rsrc_node *ref_node) |
1642b445 | 7157 | { |
28a9fe25 PB |
7158 | percpu_ref_exit(&ref_node->refs); |
7159 | kfree(ref_node); | |
1642b445 PB |
7160 | } |
7161 | ||
b9bd2bea PB |
7162 | static void io_rsrc_node_ref_zero(struct percpu_ref *ref) |
7163 | { | |
7164 | struct io_rsrc_node *node = container_of(ref, struct io_rsrc_node, refs); | |
7165 | struct io_ring_ctx *ctx = node->rsrc_data->ctx; | |
7166 | unsigned long flags; | |
7167 | bool first_add = false; | |
7168 | ||
7169 | spin_lock_irqsave(&ctx->rsrc_ref_lock, flags); | |
7170 | node->done = true; | |
7171 | ||
7172 | while (!list_empty(&ctx->rsrc_ref_list)) { | |
7173 | node = list_first_entry(&ctx->rsrc_ref_list, | |
7174 | struct io_rsrc_node, node); | |
7175 | /* recycle ref nodes in order */ | |
7176 | if (!node->done) | |
7177 | break; | |
7178 | list_del(&node->node); | |
7179 | first_add |= llist_add(&node->llist, &ctx->rsrc_put_llist); | |
7180 | } | |
7181 | spin_unlock_irqrestore(&ctx->rsrc_ref_lock, flags); | |
7182 | ||
7183 | if (first_add) | |
7184 | mod_delayed_work(system_wq, &ctx->rsrc_put_work, HZ); | |
7185 | } | |
7186 | ||
7187 | static struct io_rsrc_node *io_rsrc_node_alloc(struct io_ring_ctx *ctx) | |
7188 | { | |
7189 | struct io_rsrc_node *ref_node; | |
7190 | ||
7191 | ref_node = kzalloc(sizeof(*ref_node), GFP_KERNEL); | |
7192 | if (!ref_node) | |
7193 | return NULL; | |
7194 | ||
7195 | if (percpu_ref_init(&ref_node->refs, io_rsrc_node_ref_zero, | |
7196 | 0, GFP_KERNEL)) { | |
7197 | kfree(ref_node); | |
7198 | return NULL; | |
7199 | } | |
7200 | INIT_LIST_HEAD(&ref_node->node); | |
7201 | INIT_LIST_HEAD(&ref_node->rsrc_list); | |
7202 | ref_node->done = false; | |
7203 | return ref_node; | |
7204 | } | |
7205 | ||
a7f0ed5a PB |
7206 | static void io_rsrc_node_switch(struct io_ring_ctx *ctx, |
7207 | struct io_rsrc_data *data_to_kill) | |
6b06314c | 7208 | { |
a7f0ed5a PB |
7209 | WARN_ON_ONCE(!ctx->rsrc_backup_node); |
7210 | WARN_ON_ONCE(data_to_kill && !ctx->rsrc_node); | |
6b06314c | 7211 | |
a7f0ed5a PB |
7212 | if (data_to_kill) { |
7213 | struct io_rsrc_node *rsrc_node = ctx->rsrc_node; | |
82fbcfa9 | 7214 | |
a7f0ed5a | 7215 | rsrc_node->rsrc_data = data_to_kill; |
4956b9ea | 7216 | spin_lock_irq(&ctx->rsrc_ref_lock); |
a7f0ed5a | 7217 | list_add_tail(&rsrc_node->node, &ctx->rsrc_ref_list); |
4956b9ea | 7218 | spin_unlock_irq(&ctx->rsrc_ref_lock); |
82fbcfa9 | 7219 | |
3e942498 | 7220 | atomic_inc(&data_to_kill->refs); |
a7f0ed5a PB |
7221 | percpu_ref_kill(&rsrc_node->refs); |
7222 | ctx->rsrc_node = NULL; | |
7223 | } | |
6b06314c | 7224 | |
a7f0ed5a PB |
7225 | if (!ctx->rsrc_node) { |
7226 | ctx->rsrc_node = ctx->rsrc_backup_node; | |
7227 | ctx->rsrc_backup_node = NULL; | |
7228 | } | |
8bad28d8 HX |
7229 | } |
7230 | ||
a7f0ed5a | 7231 | static int io_rsrc_node_switch_start(struct io_ring_ctx *ctx) |
8dd03afe PB |
7232 | { |
7233 | if (ctx->rsrc_backup_node) | |
7234 | return 0; | |
b895c9a6 | 7235 | ctx->rsrc_backup_node = io_rsrc_node_alloc(ctx); |
8dd03afe | 7236 | return ctx->rsrc_backup_node ? 0 : -ENOMEM; |
8bad28d8 HX |
7237 | } |
7238 | ||
40ae0ff7 | 7239 | static int io_rsrc_ref_quiesce(struct io_rsrc_data *data, struct io_ring_ctx *ctx) |
8bad28d8 HX |
7240 | { |
7241 | int ret; | |
05589553 | 7242 | |
215c3902 | 7243 | /* As we may drop ->uring_lock, other task may have started quiesce */ |
8bad28d8 HX |
7244 | if (data->quiesce) |
7245 | return -ENXIO; | |
05589553 | 7246 | |
8bad28d8 | 7247 | data->quiesce = true; |
1ffc5422 | 7248 | do { |
a7f0ed5a | 7249 | ret = io_rsrc_node_switch_start(ctx); |
8dd03afe | 7250 | if (ret) |
f2303b1f | 7251 | break; |
a7f0ed5a | 7252 | io_rsrc_node_switch(ctx, data); |
f2303b1f | 7253 | |
3e942498 PB |
7254 | /* kill initial ref, already quiesced if zero */ |
7255 | if (atomic_dec_and_test(&data->refs)) | |
7256 | break; | |
c018db4a | 7257 | mutex_unlock(&ctx->uring_lock); |
8bad28d8 | 7258 | flush_delayed_work(&ctx->rsrc_put_work); |
1ffc5422 | 7259 | ret = wait_for_completion_interruptible(&data->done); |
c018db4a JA |
7260 | if (!ret) { |
7261 | mutex_lock(&ctx->uring_lock); | |
1ffc5422 | 7262 | break; |
c018db4a | 7263 | } |
8bad28d8 | 7264 | |
3e942498 PB |
7265 | atomic_inc(&data->refs); |
7266 | /* wait for all works potentially completing data->done */ | |
7267 | flush_delayed_work(&ctx->rsrc_put_work); | |
cb5e1b81 | 7268 | reinit_completion(&data->done); |
8dd03afe | 7269 | |
1ffc5422 | 7270 | ret = io_run_task_work_sig(); |
8bad28d8 | 7271 | mutex_lock(&ctx->uring_lock); |
f2303b1f | 7272 | } while (ret >= 0); |
8bad28d8 | 7273 | data->quiesce = false; |
05f3fb3c | 7274 | |
8bad28d8 | 7275 | return ret; |
d7954b2b BM |
7276 | } |
7277 | ||
2d091d62 PB |
7278 | static u64 *io_get_tag_slot(struct io_rsrc_data *data, unsigned int idx) |
7279 | { | |
7280 | unsigned int off = idx & IO_RSRC_TAG_TABLE_MASK; | |
7281 | unsigned int table_idx = idx >> IO_RSRC_TAG_TABLE_SHIFT; | |
7282 | ||
7283 | return &data->tags[table_idx][off]; | |
7284 | } | |
7285 | ||
44b31f2f | 7286 | static void io_rsrc_data_free(struct io_rsrc_data *data) |
1ad555c6 | 7287 | { |
2d091d62 PB |
7288 | size_t size = data->nr * sizeof(data->tags[0][0]); |
7289 | ||
7290 | if (data->tags) | |
7291 | io_free_page_table((void **)data->tags, size); | |
44b31f2f PB |
7292 | kfree(data); |
7293 | } | |
7294 | ||
d878c816 PB |
7295 | static int io_rsrc_data_alloc(struct io_ring_ctx *ctx, rsrc_put_fn *do_put, |
7296 | u64 __user *utags, unsigned nr, | |
7297 | struct io_rsrc_data **pdata) | |
1ad555c6 | 7298 | { |
b895c9a6 | 7299 | struct io_rsrc_data *data; |
2d091d62 | 7300 | int ret = -ENOMEM; |
d878c816 | 7301 | unsigned i; |
1ad555c6 BM |
7302 | |
7303 | data = kzalloc(sizeof(*data), GFP_KERNEL); | |
7304 | if (!data) | |
d878c816 | 7305 | return -ENOMEM; |
2d091d62 | 7306 | data->tags = (u64 **)io_alloc_page_table(nr * sizeof(data->tags[0][0])); |
b60c8dce | 7307 | if (!data->tags) { |
1ad555c6 | 7308 | kfree(data); |
d878c816 PB |
7309 | return -ENOMEM; |
7310 | } | |
2d091d62 PB |
7311 | |
7312 | data->nr = nr; | |
7313 | data->ctx = ctx; | |
7314 | data->do_put = do_put; | |
d878c816 | 7315 | if (utags) { |
2d091d62 | 7316 | ret = -EFAULT; |
d878c816 | 7317 | for (i = 0; i < nr; i++) { |
fdd1dc31 CIK |
7318 | u64 *tag_slot = io_get_tag_slot(data, i); |
7319 | ||
7320 | if (copy_from_user(tag_slot, &utags[i], | |
7321 | sizeof(*tag_slot))) | |
2d091d62 | 7322 | goto fail; |
d878c816 | 7323 | } |
1ad555c6 | 7324 | } |
b60c8dce | 7325 | |
3e942498 | 7326 | atomic_set(&data->refs, 1); |
1ad555c6 | 7327 | init_completion(&data->done); |
d878c816 PB |
7328 | *pdata = data; |
7329 | return 0; | |
2d091d62 PB |
7330 | fail: |
7331 | io_rsrc_data_free(data); | |
7332 | return ret; | |
1ad555c6 BM |
7333 | } |
7334 | ||
9123c8ff PB |
7335 | static bool io_alloc_file_tables(struct io_file_table *table, unsigned nr_files) |
7336 | { | |
042b0d85 | 7337 | table->files = kvcalloc(nr_files, sizeof(table->files[0]), GFP_KERNEL); |
9123c8ff PB |
7338 | return !!table->files; |
7339 | } | |
7340 | ||
042b0d85 | 7341 | static void io_free_file_tables(struct io_file_table *table) |
9123c8ff | 7342 | { |
042b0d85 | 7343 | kvfree(table->files); |
9123c8ff PB |
7344 | table->files = NULL; |
7345 | } | |
7346 | ||
fff4db76 | 7347 | static void __io_sqe_files_unregister(struct io_ring_ctx *ctx) |
1ad555c6 | 7348 | { |
fff4db76 PB |
7349 | #if defined(CONFIG_UNIX) |
7350 | if (ctx->ring_sock) { | |
7351 | struct sock *sock = ctx->ring_sock->sk; | |
7352 | struct sk_buff *skb; | |
7353 | ||
7354 | while ((skb = skb_dequeue(&sock->sk_receive_queue)) != NULL) | |
7355 | kfree_skb(skb); | |
7356 | } | |
7357 | #else | |
7358 | int i; | |
7359 | ||
7360 | for (i = 0; i < ctx->nr_user_files; i++) { | |
7361 | struct file *file; | |
7362 | ||
7363 | file = io_file_from_index(ctx, i); | |
7364 | if (file) | |
7365 | fput(file); | |
7366 | } | |
7367 | #endif | |
042b0d85 | 7368 | io_free_file_tables(&ctx->file_table); |
44b31f2f | 7369 | io_rsrc_data_free(ctx->file_data); |
fff4db76 PB |
7370 | ctx->file_data = NULL; |
7371 | ctx->nr_user_files = 0; | |
1ad555c6 BM |
7372 | } |
7373 | ||
d7954b2b BM |
7374 | static int io_sqe_files_unregister(struct io_ring_ctx *ctx) |
7375 | { | |
d7954b2b BM |
7376 | int ret; |
7377 | ||
08480400 | 7378 | if (!ctx->file_data) |
d7954b2b | 7379 | return -ENXIO; |
08480400 PB |
7380 | ret = io_rsrc_ref_quiesce(ctx->file_data, ctx); |
7381 | if (!ret) | |
7382 | __io_sqe_files_unregister(ctx); | |
7383 | return ret; | |
6b06314c JA |
7384 | } |
7385 | ||
37d1e2e3 | 7386 | static void io_sq_thread_unpark(struct io_sq_data *sqd) |
09a6f4ef | 7387 | __releases(&sqd->lock) |
37d1e2e3 | 7388 | { |
521d6a73 PB |
7389 | WARN_ON_ONCE(sqd->thread == current); |
7390 | ||
9e138a48 PB |
7391 | /* |
7392 | * Do the dance but not conditional clear_bit() because it'd race with | |
7393 | * other threads incrementing park_pending and setting the bit. | |
7394 | */ | |
37d1e2e3 | 7395 | clear_bit(IO_SQ_THREAD_SHOULD_PARK, &sqd->state); |
9e138a48 PB |
7396 | if (atomic_dec_return(&sqd->park_pending)) |
7397 | set_bit(IO_SQ_THREAD_SHOULD_PARK, &sqd->state); | |
09a6f4ef | 7398 | mutex_unlock(&sqd->lock); |
37d1e2e3 JA |
7399 | } |
7400 | ||
86e0d676 | 7401 | static void io_sq_thread_park(struct io_sq_data *sqd) |
09a6f4ef | 7402 | __acquires(&sqd->lock) |
37d1e2e3 | 7403 | { |
521d6a73 PB |
7404 | WARN_ON_ONCE(sqd->thread == current); |
7405 | ||
9e138a48 | 7406 | atomic_inc(&sqd->park_pending); |
86e0d676 | 7407 | set_bit(IO_SQ_THREAD_SHOULD_PARK, &sqd->state); |
09a6f4ef | 7408 | mutex_lock(&sqd->lock); |
05962f95 | 7409 | if (sqd->thread) |
86e0d676 | 7410 | wake_up_process(sqd->thread); |
37d1e2e3 JA |
7411 | } |
7412 | ||
7413 | static void io_sq_thread_stop(struct io_sq_data *sqd) | |
7414 | { | |
521d6a73 | 7415 | WARN_ON_ONCE(sqd->thread == current); |
88885f66 | 7416 | WARN_ON_ONCE(test_bit(IO_SQ_THREAD_SHOULD_STOP, &sqd->state)); |
521d6a73 | 7417 | |
05962f95 | 7418 | set_bit(IO_SQ_THREAD_SHOULD_STOP, &sqd->state); |
88885f66 | 7419 | mutex_lock(&sqd->lock); |
e8f98f24 JA |
7420 | if (sqd->thread) |
7421 | wake_up_process(sqd->thread); | |
09a6f4ef | 7422 | mutex_unlock(&sqd->lock); |
05962f95 | 7423 | wait_for_completion(&sqd->exited); |
37d1e2e3 JA |
7424 | } |
7425 | ||
534ca6d6 | 7426 | static void io_put_sq_data(struct io_sq_data *sqd) |
6c271ce2 | 7427 | { |
534ca6d6 | 7428 | if (refcount_dec_and_test(&sqd->refs)) { |
9e138a48 PB |
7429 | WARN_ON_ONCE(atomic_read(&sqd->park_pending)); |
7430 | ||
37d1e2e3 JA |
7431 | io_sq_thread_stop(sqd); |
7432 | kfree(sqd); | |
7433 | } | |
7434 | } | |
7435 | ||
7436 | static void io_sq_thread_finish(struct io_ring_ctx *ctx) | |
7437 | { | |
7438 | struct io_sq_data *sqd = ctx->sq_data; | |
7439 | ||
7440 | if (sqd) { | |
05962f95 | 7441 | io_sq_thread_park(sqd); |
521d6a73 | 7442 | list_del_init(&ctx->sqd_list); |
37d1e2e3 | 7443 | io_sqd_update_thread_idle(sqd); |
05962f95 | 7444 | io_sq_thread_unpark(sqd); |
37d1e2e3 JA |
7445 | |
7446 | io_put_sq_data(sqd); | |
7447 | ctx->sq_data = NULL; | |
534ca6d6 JA |
7448 | } |
7449 | } | |
7450 | ||
aa06165d JA |
7451 | static struct io_sq_data *io_attach_sq_data(struct io_uring_params *p) |
7452 | { | |
7453 | struct io_ring_ctx *ctx_attach; | |
7454 | struct io_sq_data *sqd; | |
7455 | struct fd f; | |
7456 | ||
7457 | f = fdget(p->wq_fd); | |
7458 | if (!f.file) | |
7459 | return ERR_PTR(-ENXIO); | |
7460 | if (f.file->f_op != &io_uring_fops) { | |
7461 | fdput(f); | |
7462 | return ERR_PTR(-EINVAL); | |
7463 | } | |
7464 | ||
7465 | ctx_attach = f.file->private_data; | |
7466 | sqd = ctx_attach->sq_data; | |
7467 | if (!sqd) { | |
7468 | fdput(f); | |
7469 | return ERR_PTR(-EINVAL); | |
7470 | } | |
5c2469e0 JA |
7471 | if (sqd->task_tgid != current->tgid) { |
7472 | fdput(f); | |
7473 | return ERR_PTR(-EPERM); | |
7474 | } | |
aa06165d JA |
7475 | |
7476 | refcount_inc(&sqd->refs); | |
7477 | fdput(f); | |
7478 | return sqd; | |
7479 | } | |
7480 | ||
26984fbf PB |
7481 | static struct io_sq_data *io_get_sq_data(struct io_uring_params *p, |
7482 | bool *attached) | |
534ca6d6 JA |
7483 | { |
7484 | struct io_sq_data *sqd; | |
7485 | ||
26984fbf | 7486 | *attached = false; |
5c2469e0 JA |
7487 | if (p->flags & IORING_SETUP_ATTACH_WQ) { |
7488 | sqd = io_attach_sq_data(p); | |
26984fbf PB |
7489 | if (!IS_ERR(sqd)) { |
7490 | *attached = true; | |
5c2469e0 | 7491 | return sqd; |
26984fbf | 7492 | } |
5c2469e0 JA |
7493 | /* fall through for EPERM case, setup new sqd/task */ |
7494 | if (PTR_ERR(sqd) != -EPERM) | |
7495 | return sqd; | |
7496 | } | |
aa06165d | 7497 | |
534ca6d6 JA |
7498 | sqd = kzalloc(sizeof(*sqd), GFP_KERNEL); |
7499 | if (!sqd) | |
7500 | return ERR_PTR(-ENOMEM); | |
7501 | ||
9e138a48 | 7502 | atomic_set(&sqd->park_pending, 0); |
534ca6d6 | 7503 | refcount_set(&sqd->refs, 1); |
69fb2131 | 7504 | INIT_LIST_HEAD(&sqd->ctx_list); |
09a6f4ef | 7505 | mutex_init(&sqd->lock); |
534ca6d6 | 7506 | init_waitqueue_head(&sqd->wait); |
37d1e2e3 | 7507 | init_completion(&sqd->exited); |
534ca6d6 JA |
7508 | return sqd; |
7509 | } | |
7510 | ||
6b06314c | 7511 | #if defined(CONFIG_UNIX) |
6b06314c JA |
7512 | /* |
7513 | * Ensure the UNIX gc is aware of our file set, so we are certain that | |
7514 | * the io_uring can be safely unregistered on process exit, even if we have | |
7515 | * loops in the file referencing. | |
7516 | */ | |
7517 | static int __io_sqe_files_scm(struct io_ring_ctx *ctx, int nr, int offset) | |
7518 | { | |
7519 | struct sock *sk = ctx->ring_sock->sk; | |
7520 | struct scm_fp_list *fpl; | |
7521 | struct sk_buff *skb; | |
08a45173 | 7522 | int i, nr_files; |
6b06314c | 7523 | |
6b06314c JA |
7524 | fpl = kzalloc(sizeof(*fpl), GFP_KERNEL); |
7525 | if (!fpl) | |
7526 | return -ENOMEM; | |
7527 | ||
7528 | skb = alloc_skb(0, GFP_KERNEL); | |
7529 | if (!skb) { | |
7530 | kfree(fpl); | |
7531 | return -ENOMEM; | |
7532 | } | |
7533 | ||
7534 | skb->sk = sk; | |
6b06314c | 7535 | |
08a45173 | 7536 | nr_files = 0; |
62e398be | 7537 | fpl->user = get_uid(current_user()); |
6b06314c | 7538 | for (i = 0; i < nr; i++) { |
65e19f54 JA |
7539 | struct file *file = io_file_from_index(ctx, i + offset); |
7540 | ||
7541 | if (!file) | |
08a45173 | 7542 | continue; |
65e19f54 | 7543 | fpl->fp[nr_files] = get_file(file); |
08a45173 JA |
7544 | unix_inflight(fpl->user, fpl->fp[nr_files]); |
7545 | nr_files++; | |
6b06314c JA |
7546 | } |
7547 | ||
08a45173 JA |
7548 | if (nr_files) { |
7549 | fpl->max = SCM_MAX_FD; | |
7550 | fpl->count = nr_files; | |
7551 | UNIXCB(skb).fp = fpl; | |
05f3fb3c | 7552 | skb->destructor = unix_destruct_scm; |
08a45173 JA |
7553 | refcount_add(skb->truesize, &sk->sk_wmem_alloc); |
7554 | skb_queue_head(&sk->sk_receive_queue, skb); | |
6b06314c | 7555 | |
08a45173 JA |
7556 | for (i = 0; i < nr_files; i++) |
7557 | fput(fpl->fp[i]); | |
7558 | } else { | |
7559 | kfree_skb(skb); | |
7560 | kfree(fpl); | |
7561 | } | |
6b06314c JA |
7562 | |
7563 | return 0; | |
7564 | } | |
7565 | ||
7566 | /* | |
7567 | * If UNIX sockets are enabled, fd passing can cause a reference cycle which | |
7568 | * causes regular reference counting to break down. We rely on the UNIX | |
7569 | * garbage collection to take care of this problem for us. | |
7570 | */ | |
7571 | static int io_sqe_files_scm(struct io_ring_ctx *ctx) | |
7572 | { | |
7573 | unsigned left, total; | |
7574 | int ret = 0; | |
7575 | ||
7576 | total = 0; | |
7577 | left = ctx->nr_user_files; | |
7578 | while (left) { | |
7579 | unsigned this_files = min_t(unsigned, left, SCM_MAX_FD); | |
6b06314c JA |
7580 | |
7581 | ret = __io_sqe_files_scm(ctx, this_files, total); | |
7582 | if (ret) | |
7583 | break; | |
7584 | left -= this_files; | |
7585 | total += this_files; | |
7586 | } | |
7587 | ||
7588 | if (!ret) | |
7589 | return 0; | |
7590 | ||
7591 | while (total < ctx->nr_user_files) { | |
65e19f54 JA |
7592 | struct file *file = io_file_from_index(ctx, total); |
7593 | ||
7594 | if (file) | |
7595 | fput(file); | |
6b06314c JA |
7596 | total++; |
7597 | } | |
7598 | ||
7599 | return ret; | |
7600 | } | |
7601 | #else | |
7602 | static int io_sqe_files_scm(struct io_ring_ctx *ctx) | |
7603 | { | |
7604 | return 0; | |
7605 | } | |
7606 | #endif | |
7607 | ||
47e90392 | 7608 | static void io_rsrc_file_put(struct io_ring_ctx *ctx, struct io_rsrc_put *prsrc) |
05f3fb3c | 7609 | { |
50238531 | 7610 | struct file *file = prsrc->file; |
05f3fb3c JA |
7611 | #if defined(CONFIG_UNIX) |
7612 | struct sock *sock = ctx->ring_sock->sk; | |
7613 | struct sk_buff_head list, *head = &sock->sk_receive_queue; | |
7614 | struct sk_buff *skb; | |
7615 | int i; | |
7616 | ||
7617 | __skb_queue_head_init(&list); | |
7618 | ||
7619 | /* | |
7620 | * Find the skb that holds this file in its SCM_RIGHTS. When found, | |
7621 | * remove this entry and rearrange the file array. | |
7622 | */ | |
7623 | skb = skb_dequeue(head); | |
7624 | while (skb) { | |
7625 | struct scm_fp_list *fp; | |
7626 | ||
7627 | fp = UNIXCB(skb).fp; | |
7628 | for (i = 0; i < fp->count; i++) { | |
7629 | int left; | |
7630 | ||
7631 | if (fp->fp[i] != file) | |
7632 | continue; | |
7633 | ||
7634 | unix_notinflight(fp->user, fp->fp[i]); | |
7635 | left = fp->count - 1 - i; | |
7636 | if (left) { | |
7637 | memmove(&fp->fp[i], &fp->fp[i + 1], | |
7638 | left * sizeof(struct file *)); | |
7639 | } | |
7640 | fp->count--; | |
7641 | if (!fp->count) { | |
7642 | kfree_skb(skb); | |
7643 | skb = NULL; | |
7644 | } else { | |
7645 | __skb_queue_tail(&list, skb); | |
7646 | } | |
7647 | fput(file); | |
7648 | file = NULL; | |
7649 | break; | |
7650 | } | |
7651 | ||
7652 | if (!file) | |
7653 | break; | |
7654 | ||
7655 | __skb_queue_tail(&list, skb); | |
7656 | ||
7657 | skb = skb_dequeue(head); | |
7658 | } | |
7659 | ||
7660 | if (skb_peek(&list)) { | |
7661 | spin_lock_irq(&head->lock); | |
7662 | while ((skb = __skb_dequeue(&list)) != NULL) | |
7663 | __skb_queue_tail(head, skb); | |
7664 | spin_unlock_irq(&head->lock); | |
7665 | } | |
7666 | #else | |
7667 | fput(file); | |
7668 | #endif | |
7669 | } | |
7670 | ||
b895c9a6 | 7671 | static void __io_rsrc_put_work(struct io_rsrc_node *ref_node) |
65e19f54 | 7672 | { |
b895c9a6 | 7673 | struct io_rsrc_data *rsrc_data = ref_node->rsrc_data; |
269bbe5f BM |
7674 | struct io_ring_ctx *ctx = rsrc_data->ctx; |
7675 | struct io_rsrc_put *prsrc, *tmp; | |
05589553 | 7676 | |
269bbe5f BM |
7677 | list_for_each_entry_safe(prsrc, tmp, &ref_node->rsrc_list, list) { |
7678 | list_del(&prsrc->list); | |
b60c8dce PB |
7679 | |
7680 | if (prsrc->tag) { | |
7681 | bool lock_ring = ctx->flags & IORING_SETUP_IOPOLL; | |
b60c8dce PB |
7682 | |
7683 | io_ring_submit_lock(ctx, lock_ring); | |
157d257f | 7684 | spin_lock_irq(&ctx->completion_lock); |
b60c8dce | 7685 | io_cqring_fill_event(ctx, prsrc->tag, 0, 0); |
2840f710 | 7686 | ctx->cq_extra++; |
b60c8dce | 7687 | io_commit_cqring(ctx); |
157d257f | 7688 | spin_unlock_irq(&ctx->completion_lock); |
b60c8dce PB |
7689 | io_cqring_ev_posted(ctx); |
7690 | io_ring_submit_unlock(ctx, lock_ring); | |
7691 | } | |
7692 | ||
40ae0ff7 | 7693 | rsrc_data->do_put(ctx, prsrc); |
269bbe5f | 7694 | kfree(prsrc); |
65e19f54 | 7695 | } |
05589553 | 7696 | |
28a9fe25 | 7697 | io_rsrc_node_destroy(ref_node); |
3e942498 PB |
7698 | if (atomic_dec_and_test(&rsrc_data->refs)) |
7699 | complete(&rsrc_data->done); | |
2faf852d | 7700 | } |
65e19f54 | 7701 | |
269bbe5f | 7702 | static void io_rsrc_put_work(struct work_struct *work) |
4a38aed2 JA |
7703 | { |
7704 | struct io_ring_ctx *ctx; | |
7705 | struct llist_node *node; | |
7706 | ||
269bbe5f BM |
7707 | ctx = container_of(work, struct io_ring_ctx, rsrc_put_work.work); |
7708 | node = llist_del_all(&ctx->rsrc_put_llist); | |
4a38aed2 JA |
7709 | |
7710 | while (node) { | |
b895c9a6 | 7711 | struct io_rsrc_node *ref_node; |
4a38aed2 JA |
7712 | struct llist_node *next = node->next; |
7713 | ||
b895c9a6 | 7714 | ref_node = llist_entry(node, struct io_rsrc_node, llist); |
269bbe5f | 7715 | __io_rsrc_put_work(ref_node); |
4a38aed2 JA |
7716 | node = next; |
7717 | } | |
7718 | } | |
7719 | ||
6b06314c | 7720 | static int io_sqe_files_register(struct io_ring_ctx *ctx, void __user *arg, |
792e3582 | 7721 | unsigned nr_args, u64 __user *tags) |
6b06314c JA |
7722 | { |
7723 | __s32 __user *fds = (__s32 __user *) arg; | |
05f3fb3c | 7724 | struct file *file; |
f3baed39 | 7725 | int fd, ret; |
846a4ef2 | 7726 | unsigned i; |
6b06314c | 7727 | |
05f3fb3c | 7728 | if (ctx->file_data) |
6b06314c JA |
7729 | return -EBUSY; |
7730 | if (!nr_args) | |
7731 | return -EINVAL; | |
7732 | if (nr_args > IORING_MAX_FIXED_FILES) | |
7733 | return -EMFILE; | |
a7f0ed5a | 7734 | ret = io_rsrc_node_switch_start(ctx); |
f3baed39 PB |
7735 | if (ret) |
7736 | return ret; | |
d878c816 PB |
7737 | ret = io_rsrc_data_alloc(ctx, io_rsrc_file_put, tags, nr_args, |
7738 | &ctx->file_data); | |
7739 | if (ret) | |
7740 | return ret; | |
6b06314c | 7741 | |
f3baed39 | 7742 | ret = -ENOMEM; |
aeca241b | 7743 | if (!io_alloc_file_tables(&ctx->file_table, nr_args)) |
1ad555c6 | 7744 | goto out_free; |
65e19f54 | 7745 | |
08a45173 | 7746 | for (i = 0; i < nr_args; i++, ctx->nr_user_files++) { |
d878c816 | 7747 | if (copy_from_user(&fd, &fds[i], sizeof(fd))) { |
600cf3f8 PB |
7748 | ret = -EFAULT; |
7749 | goto out_fput; | |
7750 | } | |
08a45173 | 7751 | /* allow sparse sets */ |
792e3582 PB |
7752 | if (fd == -1) { |
7753 | ret = -EINVAL; | |
2d091d62 | 7754 | if (unlikely(*io_get_tag_slot(ctx->file_data, i))) |
792e3582 | 7755 | goto out_fput; |
08a45173 | 7756 | continue; |
792e3582 | 7757 | } |
6b06314c | 7758 | |
05f3fb3c | 7759 | file = fget(fd); |
6b06314c | 7760 | ret = -EBADF; |
792e3582 | 7761 | if (unlikely(!file)) |
600cf3f8 | 7762 | goto out_fput; |
05f3fb3c | 7763 | |
6b06314c JA |
7764 | /* |
7765 | * Don't allow io_uring instances to be registered. If UNIX | |
7766 | * isn't enabled, then this causes a reference cycle and this | |
7767 | * instance can never get freed. If UNIX is enabled we'll | |
7768 | * handle it just fine, but there's still no point in allowing | |
7769 | * a ring fd as it doesn't support regular read/write anyway. | |
7770 | */ | |
05f3fb3c JA |
7771 | if (file->f_op == &io_uring_fops) { |
7772 | fput(file); | |
600cf3f8 | 7773 | goto out_fput; |
6b06314c | 7774 | } |
aeca241b | 7775 | io_fixed_file_set(io_fixed_file_slot(&ctx->file_table, i), file); |
6b06314c JA |
7776 | } |
7777 | ||
6b06314c | 7778 | ret = io_sqe_files_scm(ctx); |
05589553 | 7779 | if (ret) { |
08480400 | 7780 | __io_sqe_files_unregister(ctx); |
05589553 XW |
7781 | return ret; |
7782 | } | |
6b06314c | 7783 | |
a7f0ed5a | 7784 | io_rsrc_node_switch(ctx, NULL); |
6b06314c | 7785 | return ret; |
600cf3f8 PB |
7786 | out_fput: |
7787 | for (i = 0; i < ctx->nr_user_files; i++) { | |
7788 | file = io_file_from_index(ctx, i); | |
7789 | if (file) | |
7790 | fput(file); | |
7791 | } | |
042b0d85 | 7792 | io_free_file_tables(&ctx->file_table); |
600cf3f8 | 7793 | ctx->nr_user_files = 0; |
600cf3f8 | 7794 | out_free: |
44b31f2f | 7795 | io_rsrc_data_free(ctx->file_data); |
55cbc256 | 7796 | ctx->file_data = NULL; |
6b06314c JA |
7797 | return ret; |
7798 | } | |
7799 | ||
c3a31e60 JA |
7800 | static int io_sqe_file_register(struct io_ring_ctx *ctx, struct file *file, |
7801 | int index) | |
7802 | { | |
7803 | #if defined(CONFIG_UNIX) | |
7804 | struct sock *sock = ctx->ring_sock->sk; | |
7805 | struct sk_buff_head *head = &sock->sk_receive_queue; | |
7806 | struct sk_buff *skb; | |
7807 | ||
7808 | /* | |
7809 | * See if we can merge this file into an existing skb SCM_RIGHTS | |
7810 | * file set. If there's no room, fall back to allocating a new skb | |
7811 | * and filling it in. | |
7812 | */ | |
7813 | spin_lock_irq(&head->lock); | |
7814 | skb = skb_peek(head); | |
7815 | if (skb) { | |
7816 | struct scm_fp_list *fpl = UNIXCB(skb).fp; | |
7817 | ||
7818 | if (fpl->count < SCM_MAX_FD) { | |
7819 | __skb_unlink(skb, head); | |
7820 | spin_unlock_irq(&head->lock); | |
7821 | fpl->fp[fpl->count] = get_file(file); | |
7822 | unix_inflight(fpl->user, fpl->fp[fpl->count]); | |
7823 | fpl->count++; | |
7824 | spin_lock_irq(&head->lock); | |
7825 | __skb_queue_head(head, skb); | |
7826 | } else { | |
7827 | skb = NULL; | |
7828 | } | |
7829 | } | |
7830 | spin_unlock_irq(&head->lock); | |
7831 | ||
7832 | if (skb) { | |
7833 | fput(file); | |
7834 | return 0; | |
7835 | } | |
7836 | ||
7837 | return __io_sqe_files_scm(ctx, 1, index); | |
7838 | #else | |
7839 | return 0; | |
7840 | #endif | |
7841 | } | |
7842 | ||
b60c8dce | 7843 | static int io_queue_rsrc_removal(struct io_rsrc_data *data, unsigned idx, |
e7c78371 | 7844 | struct io_rsrc_node *node, void *rsrc) |
05f3fb3c | 7845 | { |
269bbe5f | 7846 | struct io_rsrc_put *prsrc; |
05f3fb3c | 7847 | |
269bbe5f BM |
7848 | prsrc = kzalloc(sizeof(*prsrc), GFP_KERNEL); |
7849 | if (!prsrc) | |
a5318d3c | 7850 | return -ENOMEM; |
05f3fb3c | 7851 | |
2d091d62 | 7852 | prsrc->tag = *io_get_tag_slot(data, idx); |
50238531 | 7853 | prsrc->rsrc = rsrc; |
e7c78371 | 7854 | list_add(&prsrc->list, &node->rsrc_list); |
a5318d3c | 7855 | return 0; |
05f3fb3c JA |
7856 | } |
7857 | ||
7858 | static int __io_sqe_files_update(struct io_ring_ctx *ctx, | |
c3bdad02 | 7859 | struct io_uring_rsrc_update2 *up, |
05f3fb3c JA |
7860 | unsigned nr_args) |
7861 | { | |
c3bdad02 | 7862 | u64 __user *tags = u64_to_user_ptr(up->tags); |
98f0b3b4 | 7863 | __s32 __user *fds = u64_to_user_ptr(up->data); |
b895c9a6 | 7864 | struct io_rsrc_data *data = ctx->file_data; |
a04b0ac0 PB |
7865 | struct io_fixed_file *file_slot; |
7866 | struct file *file; | |
98f0b3b4 PB |
7867 | int fd, i, err = 0; |
7868 | unsigned int done; | |
05589553 | 7869 | bool needs_switch = false; |
c3a31e60 | 7870 | |
98f0b3b4 PB |
7871 | if (!ctx->file_data) |
7872 | return -ENXIO; | |
7873 | if (up->offset + nr_args > ctx->nr_user_files) | |
c3a31e60 JA |
7874 | return -EINVAL; |
7875 | ||
67973b93 | 7876 | for (done = 0; done < nr_args; done++) { |
c3bdad02 PB |
7877 | u64 tag = 0; |
7878 | ||
7879 | if ((tags && copy_from_user(&tag, &tags[done], sizeof(tag))) || | |
7880 | copy_from_user(&fd, &fds[done], sizeof(fd))) { | |
c3a31e60 JA |
7881 | err = -EFAULT; |
7882 | break; | |
7883 | } | |
c3bdad02 PB |
7884 | if ((fd == IORING_REGISTER_FILES_SKIP || fd == -1) && tag) { |
7885 | err = -EINVAL; | |
7886 | break; | |
7887 | } | |
4e0377a1 | 7888 | if (fd == IORING_REGISTER_FILES_SKIP) |
7889 | continue; | |
7890 | ||
67973b93 | 7891 | i = array_index_nospec(up->offset + done, ctx->nr_user_files); |
aeca241b | 7892 | file_slot = io_fixed_file_slot(&ctx->file_table, i); |
ea64ec02 | 7893 | |
a04b0ac0 PB |
7894 | if (file_slot->file_ptr) { |
7895 | file = (struct file *)(file_slot->file_ptr & FFS_MASK); | |
b60c8dce PB |
7896 | err = io_queue_rsrc_removal(data, up->offset + done, |
7897 | ctx->rsrc_node, file); | |
a5318d3c HD |
7898 | if (err) |
7899 | break; | |
a04b0ac0 | 7900 | file_slot->file_ptr = 0; |
05589553 | 7901 | needs_switch = true; |
c3a31e60 JA |
7902 | } |
7903 | if (fd != -1) { | |
c3a31e60 JA |
7904 | file = fget(fd); |
7905 | if (!file) { | |
7906 | err = -EBADF; | |
7907 | break; | |
7908 | } | |
7909 | /* | |
7910 | * Don't allow io_uring instances to be registered. If | |
7911 | * UNIX isn't enabled, then this causes a reference | |
7912 | * cycle and this instance can never get freed. If UNIX | |
7913 | * is enabled we'll handle it just fine, but there's | |
7914 | * still no point in allowing a ring fd as it doesn't | |
7915 | * support regular read/write anyway. | |
7916 | */ | |
7917 | if (file->f_op == &io_uring_fops) { | |
7918 | fput(file); | |
7919 | err = -EBADF; | |
7920 | break; | |
7921 | } | |
2d091d62 | 7922 | *io_get_tag_slot(data, up->offset + done) = tag; |
9a321c98 | 7923 | io_fixed_file_set(file_slot, file); |
c3a31e60 | 7924 | err = io_sqe_file_register(ctx, file, i); |
f3bd9dae | 7925 | if (err) { |
a04b0ac0 | 7926 | file_slot->file_ptr = 0; |
f3bd9dae | 7927 | fput(file); |
c3a31e60 | 7928 | break; |
f3bd9dae | 7929 | } |
c3a31e60 | 7930 | } |
05f3fb3c JA |
7931 | } |
7932 | ||
a7f0ed5a PB |
7933 | if (needs_switch) |
7934 | io_rsrc_node_switch(ctx, data); | |
c3a31e60 JA |
7935 | return done ? done : err; |
7936 | } | |
05589553 | 7937 | |
685fe7fe JA |
7938 | static struct io_wq *io_init_wq_offload(struct io_ring_ctx *ctx, |
7939 | struct task_struct *task) | |
24369c2e | 7940 | { |
e941894e | 7941 | struct io_wq_hash *hash; |
24369c2e | 7942 | struct io_wq_data data; |
24369c2e | 7943 | unsigned int concurrency; |
24369c2e | 7944 | |
362a9e65 | 7945 | mutex_lock(&ctx->uring_lock); |
e941894e JA |
7946 | hash = ctx->hash_map; |
7947 | if (!hash) { | |
7948 | hash = kzalloc(sizeof(*hash), GFP_KERNEL); | |
362a9e65 YY |
7949 | if (!hash) { |
7950 | mutex_unlock(&ctx->uring_lock); | |
e941894e | 7951 | return ERR_PTR(-ENOMEM); |
362a9e65 | 7952 | } |
e941894e JA |
7953 | refcount_set(&hash->refs, 1); |
7954 | init_waitqueue_head(&hash->wait); | |
7955 | ctx->hash_map = hash; | |
24369c2e | 7956 | } |
362a9e65 | 7957 | mutex_unlock(&ctx->uring_lock); |
24369c2e | 7958 | |
e941894e | 7959 | data.hash = hash; |
685fe7fe | 7960 | data.task = task; |
ebc11b6c | 7961 | data.free_work = io_wq_free_work; |
f5fa38c5 | 7962 | data.do_work = io_wq_submit_work; |
24369c2e | 7963 | |
d25e3a3d JA |
7964 | /* Do QD, or 4 * CPUS, whatever is smallest */ |
7965 | concurrency = min(ctx->sq_entries, 4 * num_online_cpus()); | |
24369c2e | 7966 | |
5aa75ed5 | 7967 | return io_wq_create(concurrency, &data); |
24369c2e PB |
7968 | } |
7969 | ||
5aa75ed5 JA |
7970 | static int io_uring_alloc_task_context(struct task_struct *task, |
7971 | struct io_ring_ctx *ctx) | |
0f212204 JA |
7972 | { |
7973 | struct io_uring_task *tctx; | |
d8a6df10 | 7974 | int ret; |
0f212204 | 7975 | |
09899b19 | 7976 | tctx = kzalloc(sizeof(*tctx), GFP_KERNEL); |
0f212204 JA |
7977 | if (unlikely(!tctx)) |
7978 | return -ENOMEM; | |
7979 | ||
d8a6df10 JA |
7980 | ret = percpu_counter_init(&tctx->inflight, 0, GFP_KERNEL); |
7981 | if (unlikely(ret)) { | |
7982 | kfree(tctx); | |
7983 | return ret; | |
7984 | } | |
7985 | ||
685fe7fe | 7986 | tctx->io_wq = io_init_wq_offload(ctx, task); |
5aa75ed5 JA |
7987 | if (IS_ERR(tctx->io_wq)) { |
7988 | ret = PTR_ERR(tctx->io_wq); | |
7989 | percpu_counter_destroy(&tctx->inflight); | |
7990 | kfree(tctx); | |
7991 | return ret; | |
7992 | } | |
7993 | ||
0f212204 JA |
7994 | xa_init(&tctx->xa); |
7995 | init_waitqueue_head(&tctx->wait); | |
fdaf083c | 7996 | atomic_set(&tctx->in_idle, 0); |
b303fe2e | 7997 | atomic_set(&tctx->inflight_tracked, 0); |
0f212204 | 7998 | task->io_uring = tctx; |
7cbf1722 JA |
7999 | spin_lock_init(&tctx->task_lock); |
8000 | INIT_WQ_LIST(&tctx->task_list); | |
7cbf1722 | 8001 | init_task_work(&tctx->task_work, tctx_task_work); |
0f212204 JA |
8002 | return 0; |
8003 | } | |
8004 | ||
8005 | void __io_uring_free(struct task_struct *tsk) | |
8006 | { | |
8007 | struct io_uring_task *tctx = tsk->io_uring; | |
8008 | ||
8009 | WARN_ON_ONCE(!xa_empty(&tctx->xa)); | |
ef8eaa4e | 8010 | WARN_ON_ONCE(tctx->io_wq); |
09899b19 | 8011 | WARN_ON_ONCE(tctx->cached_refs); |
ef8eaa4e | 8012 | |
d8a6df10 | 8013 | percpu_counter_destroy(&tctx->inflight); |
0f212204 JA |
8014 | kfree(tctx); |
8015 | tsk->io_uring = NULL; | |
8016 | } | |
8017 | ||
7e84e1c7 SG |
8018 | static int io_sq_offload_create(struct io_ring_ctx *ctx, |
8019 | struct io_uring_params *p) | |
2b188cc1 JA |
8020 | { |
8021 | int ret; | |
8022 | ||
d25e3a3d JA |
8023 | /* Retain compatibility with failing for an invalid attach attempt */ |
8024 | if ((ctx->flags & (IORING_SETUP_ATTACH_WQ | IORING_SETUP_SQPOLL)) == | |
8025 | IORING_SETUP_ATTACH_WQ) { | |
8026 | struct fd f; | |
8027 | ||
8028 | f = fdget(p->wq_fd); | |
8029 | if (!f.file) | |
8030 | return -ENXIO; | |
0cc936f7 JA |
8031 | if (f.file->f_op != &io_uring_fops) { |
8032 | fdput(f); | |
f2a48dd0 | 8033 | return -EINVAL; |
0cc936f7 JA |
8034 | } |
8035 | fdput(f); | |
d25e3a3d | 8036 | } |
6c271ce2 | 8037 | if (ctx->flags & IORING_SETUP_SQPOLL) { |
46fe18b1 | 8038 | struct task_struct *tsk; |
534ca6d6 | 8039 | struct io_sq_data *sqd; |
26984fbf | 8040 | bool attached; |
534ca6d6 | 8041 | |
26984fbf | 8042 | sqd = io_get_sq_data(p, &attached); |
534ca6d6 JA |
8043 | if (IS_ERR(sqd)) { |
8044 | ret = PTR_ERR(sqd); | |
8045 | goto err; | |
8046 | } | |
69fb2131 | 8047 | |
7c30f36a | 8048 | ctx->sq_creds = get_current_cred(); |
534ca6d6 | 8049 | ctx->sq_data = sqd; |
917257da JA |
8050 | ctx->sq_thread_idle = msecs_to_jiffies(p->sq_thread_idle); |
8051 | if (!ctx->sq_thread_idle) | |
8052 | ctx->sq_thread_idle = HZ; | |
8053 | ||
78d7f6ba | 8054 | io_sq_thread_park(sqd); |
de75a3d3 PB |
8055 | list_add(&ctx->sqd_list, &sqd->ctx_list); |
8056 | io_sqd_update_thread_idle(sqd); | |
26984fbf | 8057 | /* don't attach to a dying SQPOLL thread, would be racy */ |
f2a48dd0 | 8058 | ret = (attached && !sqd->thread) ? -ENXIO : 0; |
78d7f6ba PB |
8059 | io_sq_thread_unpark(sqd); |
8060 | ||
de75a3d3 PB |
8061 | if (ret < 0) |
8062 | goto err; | |
8063 | if (attached) | |
5aa75ed5 | 8064 | return 0; |
aa06165d | 8065 | |
6c271ce2 | 8066 | if (p->flags & IORING_SETUP_SQ_AFF) { |
44a9bd18 | 8067 | int cpu = p->sq_thread_cpu; |
6c271ce2 | 8068 | |
917257da | 8069 | ret = -EINVAL; |
f2a48dd0 | 8070 | if (cpu >= nr_cpu_ids || !cpu_online(cpu)) |
e8f98f24 | 8071 | goto err_sqpoll; |
37d1e2e3 | 8072 | sqd->sq_cpu = cpu; |
6c271ce2 | 8073 | } else { |
37d1e2e3 | 8074 | sqd->sq_cpu = -1; |
6c271ce2 | 8075 | } |
37d1e2e3 JA |
8076 | |
8077 | sqd->task_pid = current->pid; | |
5c2469e0 | 8078 | sqd->task_tgid = current->tgid; |
46fe18b1 JA |
8079 | tsk = create_io_thread(io_sq_thread, sqd, NUMA_NO_NODE); |
8080 | if (IS_ERR(tsk)) { | |
8081 | ret = PTR_ERR(tsk); | |
e8f98f24 | 8082 | goto err_sqpoll; |
6c271ce2 | 8083 | } |
97a73a0f | 8084 | |
46fe18b1 | 8085 | sqd->thread = tsk; |
97a73a0f | 8086 | ret = io_uring_alloc_task_context(tsk, ctx); |
46fe18b1 | 8087 | wake_up_new_task(tsk); |
0f212204 JA |
8088 | if (ret) |
8089 | goto err; | |
6c271ce2 JA |
8090 | } else if (p->flags & IORING_SETUP_SQ_AFF) { |
8091 | /* Can't have SQ_AFF without SQPOLL */ | |
8092 | ret = -EINVAL; | |
8093 | goto err; | |
8094 | } | |
8095 | ||
2b188cc1 | 8096 | return 0; |
f2a48dd0 PB |
8097 | err_sqpoll: |
8098 | complete(&ctx->sq_data->exited); | |
2b188cc1 | 8099 | err: |
37d1e2e3 | 8100 | io_sq_thread_finish(ctx); |
2b188cc1 JA |
8101 | return ret; |
8102 | } | |
8103 | ||
a087e2b5 BM |
8104 | static inline void __io_unaccount_mem(struct user_struct *user, |
8105 | unsigned long nr_pages) | |
2b188cc1 JA |
8106 | { |
8107 | atomic_long_sub(nr_pages, &user->locked_vm); | |
8108 | } | |
8109 | ||
a087e2b5 BM |
8110 | static inline int __io_account_mem(struct user_struct *user, |
8111 | unsigned long nr_pages) | |
2b188cc1 JA |
8112 | { |
8113 | unsigned long page_limit, cur_pages, new_pages; | |
8114 | ||
8115 | /* Don't allow more pages than we can safely lock */ | |
8116 | page_limit = rlimit(RLIMIT_MEMLOCK) >> PAGE_SHIFT; | |
8117 | ||
8118 | do { | |
8119 | cur_pages = atomic_long_read(&user->locked_vm); | |
8120 | new_pages = cur_pages + nr_pages; | |
8121 | if (new_pages > page_limit) | |
8122 | return -ENOMEM; | |
8123 | } while (atomic_long_cmpxchg(&user->locked_vm, cur_pages, | |
8124 | new_pages) != cur_pages); | |
8125 | ||
8126 | return 0; | |
8127 | } | |
8128 | ||
26bfa89e | 8129 | static void io_unaccount_mem(struct io_ring_ctx *ctx, unsigned long nr_pages) |
a087e2b5 | 8130 | { |
62e398be | 8131 | if (ctx->user) |
a087e2b5 | 8132 | __io_unaccount_mem(ctx->user, nr_pages); |
30975825 | 8133 | |
26bfa89e JA |
8134 | if (ctx->mm_account) |
8135 | atomic64_sub(nr_pages, &ctx->mm_account->pinned_vm); | |
a087e2b5 BM |
8136 | } |
8137 | ||
26bfa89e | 8138 | static int io_account_mem(struct io_ring_ctx *ctx, unsigned long nr_pages) |
a087e2b5 | 8139 | { |
30975825 BM |
8140 | int ret; |
8141 | ||
62e398be | 8142 | if (ctx->user) { |
30975825 BM |
8143 | ret = __io_account_mem(ctx->user, nr_pages); |
8144 | if (ret) | |
8145 | return ret; | |
8146 | } | |
8147 | ||
26bfa89e JA |
8148 | if (ctx->mm_account) |
8149 | atomic64_add(nr_pages, &ctx->mm_account->pinned_vm); | |
a087e2b5 BM |
8150 | |
8151 | return 0; | |
8152 | } | |
8153 | ||
2b188cc1 JA |
8154 | static void io_mem_free(void *ptr) |
8155 | { | |
52e04ef4 MR |
8156 | struct page *page; |
8157 | ||
8158 | if (!ptr) | |
8159 | return; | |
2b188cc1 | 8160 | |
52e04ef4 | 8161 | page = virt_to_head_page(ptr); |
2b188cc1 JA |
8162 | if (put_page_testzero(page)) |
8163 | free_compound_page(page); | |
8164 | } | |
8165 | ||
8166 | static void *io_mem_alloc(size_t size) | |
8167 | { | |
8168 | gfp_t gfp_flags = GFP_KERNEL | __GFP_ZERO | __GFP_NOWARN | __GFP_COMP | | |
26bfa89e | 8169 | __GFP_NORETRY | __GFP_ACCOUNT; |
2b188cc1 JA |
8170 | |
8171 | return (void *) __get_free_pages(gfp_flags, get_order(size)); | |
8172 | } | |
8173 | ||
75b28aff HV |
8174 | static unsigned long rings_size(unsigned sq_entries, unsigned cq_entries, |
8175 | size_t *sq_offset) | |
8176 | { | |
8177 | struct io_rings *rings; | |
8178 | size_t off, sq_array_size; | |
8179 | ||
8180 | off = struct_size(rings, cqes, cq_entries); | |
8181 | if (off == SIZE_MAX) | |
8182 | return SIZE_MAX; | |
8183 | ||
8184 | #ifdef CONFIG_SMP | |
8185 | off = ALIGN(off, SMP_CACHE_BYTES); | |
8186 | if (off == 0) | |
8187 | return SIZE_MAX; | |
8188 | #endif | |
8189 | ||
b36200f5 DV |
8190 | if (sq_offset) |
8191 | *sq_offset = off; | |
8192 | ||
75b28aff HV |
8193 | sq_array_size = array_size(sizeof(u32), sq_entries); |
8194 | if (sq_array_size == SIZE_MAX) | |
8195 | return SIZE_MAX; | |
8196 | ||
8197 | if (check_add_overflow(off, sq_array_size, &off)) | |
8198 | return SIZE_MAX; | |
8199 | ||
75b28aff HV |
8200 | return off; |
8201 | } | |
8202 | ||
41edf1a5 | 8203 | static void io_buffer_unmap(struct io_ring_ctx *ctx, struct io_mapped_ubuf **slot) |
7f61a1e9 | 8204 | { |
41edf1a5 | 8205 | struct io_mapped_ubuf *imu = *slot; |
7f61a1e9 PB |
8206 | unsigned int i; |
8207 | ||
6224843d PB |
8208 | if (imu != ctx->dummy_ubuf) { |
8209 | for (i = 0; i < imu->nr_bvecs; i++) | |
8210 | unpin_user_page(imu->bvec[i].bv_page); | |
8211 | if (imu->acct_pages) | |
8212 | io_unaccount_mem(ctx, imu->acct_pages); | |
8213 | kvfree(imu); | |
8214 | } | |
41edf1a5 | 8215 | *slot = NULL; |
7f61a1e9 PB |
8216 | } |
8217 | ||
bd54b6fe | 8218 | static void io_rsrc_buf_put(struct io_ring_ctx *ctx, struct io_rsrc_put *prsrc) |
edafccee | 8219 | { |
634d00df PB |
8220 | io_buffer_unmap(ctx, &prsrc->buf); |
8221 | prsrc->buf = NULL; | |
bd54b6fe | 8222 | } |
edafccee | 8223 | |
bd54b6fe BM |
8224 | static void __io_sqe_buffers_unregister(struct io_ring_ctx *ctx) |
8225 | { | |
8226 | unsigned int i; | |
edafccee | 8227 | |
7f61a1e9 PB |
8228 | for (i = 0; i < ctx->nr_user_bufs; i++) |
8229 | io_buffer_unmap(ctx, &ctx->user_bufs[i]); | |
edafccee | 8230 | kfree(ctx->user_bufs); |
bb6659cc | 8231 | io_rsrc_data_free(ctx->buf_data); |
edafccee | 8232 | ctx->user_bufs = NULL; |
bd54b6fe | 8233 | ctx->buf_data = NULL; |
edafccee | 8234 | ctx->nr_user_bufs = 0; |
bd54b6fe BM |
8235 | } |
8236 | ||
0a96bbe4 | 8237 | static int io_sqe_buffers_unregister(struct io_ring_ctx *ctx) |
edafccee | 8238 | { |
bd54b6fe | 8239 | int ret; |
edafccee | 8240 | |
bd54b6fe | 8241 | if (!ctx->buf_data) |
edafccee JA |
8242 | return -ENXIO; |
8243 | ||
bd54b6fe BM |
8244 | ret = io_rsrc_ref_quiesce(ctx->buf_data, ctx); |
8245 | if (!ret) | |
8246 | __io_sqe_buffers_unregister(ctx); | |
8247 | return ret; | |
edafccee JA |
8248 | } |
8249 | ||
8250 | static int io_copy_iov(struct io_ring_ctx *ctx, struct iovec *dst, | |
8251 | void __user *arg, unsigned index) | |
8252 | { | |
8253 | struct iovec __user *src; | |
8254 | ||
8255 | #ifdef CONFIG_COMPAT | |
8256 | if (ctx->compat) { | |
8257 | struct compat_iovec __user *ciovs; | |
8258 | struct compat_iovec ciov; | |
8259 | ||
8260 | ciovs = (struct compat_iovec __user *) arg; | |
8261 | if (copy_from_user(&ciov, &ciovs[index], sizeof(ciov))) | |
8262 | return -EFAULT; | |
8263 | ||
d55e5f5b | 8264 | dst->iov_base = u64_to_user_ptr((u64)ciov.iov_base); |
edafccee JA |
8265 | dst->iov_len = ciov.iov_len; |
8266 | return 0; | |
8267 | } | |
8268 | #endif | |
8269 | src = (struct iovec __user *) arg; | |
8270 | if (copy_from_user(dst, &src[index], sizeof(*dst))) | |
8271 | return -EFAULT; | |
8272 | return 0; | |
8273 | } | |
8274 | ||
de293938 JA |
8275 | /* |
8276 | * Not super efficient, but this is just a registration time. And we do cache | |
8277 | * the last compound head, so generally we'll only do a full search if we don't | |
8278 | * match that one. | |
8279 | * | |
8280 | * We check if the given compound head page has already been accounted, to | |
8281 | * avoid double accounting it. This allows us to account the full size of the | |
8282 | * page, not just the constituent pages of a huge page. | |
8283 | */ | |
8284 | static bool headpage_already_acct(struct io_ring_ctx *ctx, struct page **pages, | |
8285 | int nr_pages, struct page *hpage) | |
8286 | { | |
8287 | int i, j; | |
8288 | ||
8289 | /* check current page array */ | |
8290 | for (i = 0; i < nr_pages; i++) { | |
8291 | if (!PageCompound(pages[i])) | |
8292 | continue; | |
8293 | if (compound_head(pages[i]) == hpage) | |
8294 | return true; | |
8295 | } | |
8296 | ||
8297 | /* check previously registered pages */ | |
8298 | for (i = 0; i < ctx->nr_user_bufs; i++) { | |
41edf1a5 | 8299 | struct io_mapped_ubuf *imu = ctx->user_bufs[i]; |
de293938 JA |
8300 | |
8301 | for (j = 0; j < imu->nr_bvecs; j++) { | |
8302 | if (!PageCompound(imu->bvec[j].bv_page)) | |
8303 | continue; | |
8304 | if (compound_head(imu->bvec[j].bv_page) == hpage) | |
8305 | return true; | |
8306 | } | |
8307 | } | |
8308 | ||
8309 | return false; | |
8310 | } | |
8311 | ||
8312 | static int io_buffer_account_pin(struct io_ring_ctx *ctx, struct page **pages, | |
8313 | int nr_pages, struct io_mapped_ubuf *imu, | |
8314 | struct page **last_hpage) | |
8315 | { | |
8316 | int i, ret; | |
8317 | ||
216e5835 | 8318 | imu->acct_pages = 0; |
de293938 JA |
8319 | for (i = 0; i < nr_pages; i++) { |
8320 | if (!PageCompound(pages[i])) { | |
8321 | imu->acct_pages++; | |
8322 | } else { | |
8323 | struct page *hpage; | |
8324 | ||
8325 | hpage = compound_head(pages[i]); | |
8326 | if (hpage == *last_hpage) | |
8327 | continue; | |
8328 | *last_hpage = hpage; | |
8329 | if (headpage_already_acct(ctx, pages, i, hpage)) | |
8330 | continue; | |
8331 | imu->acct_pages += page_size(hpage) >> PAGE_SHIFT; | |
8332 | } | |
8333 | } | |
8334 | ||
8335 | if (!imu->acct_pages) | |
8336 | return 0; | |
8337 | ||
26bfa89e | 8338 | ret = io_account_mem(ctx, imu->acct_pages); |
de293938 JA |
8339 | if (ret) |
8340 | imu->acct_pages = 0; | |
8341 | return ret; | |
8342 | } | |
8343 | ||
0a96bbe4 | 8344 | static int io_sqe_buffer_register(struct io_ring_ctx *ctx, struct iovec *iov, |
41edf1a5 | 8345 | struct io_mapped_ubuf **pimu, |
0a96bbe4 | 8346 | struct page **last_hpage) |
edafccee | 8347 | { |
41edf1a5 | 8348 | struct io_mapped_ubuf *imu = NULL; |
edafccee JA |
8349 | struct vm_area_struct **vmas = NULL; |
8350 | struct page **pages = NULL; | |
0a96bbe4 BM |
8351 | unsigned long off, start, end, ubuf; |
8352 | size_t size; | |
8353 | int ret, pret, nr_pages, i; | |
8354 | ||
6224843d PB |
8355 | if (!iov->iov_base) { |
8356 | *pimu = ctx->dummy_ubuf; | |
8357 | return 0; | |
8358 | } | |
8359 | ||
0a96bbe4 BM |
8360 | ubuf = (unsigned long) iov->iov_base; |
8361 | end = (ubuf + iov->iov_len + PAGE_SIZE - 1) >> PAGE_SHIFT; | |
8362 | start = ubuf >> PAGE_SHIFT; | |
8363 | nr_pages = end - start; | |
8364 | ||
41edf1a5 | 8365 | *pimu = NULL; |
0a96bbe4 BM |
8366 | ret = -ENOMEM; |
8367 | ||
8368 | pages = kvmalloc_array(nr_pages, sizeof(struct page *), GFP_KERNEL); | |
8369 | if (!pages) | |
8370 | goto done; | |
8371 | ||
8372 | vmas = kvmalloc_array(nr_pages, sizeof(struct vm_area_struct *), | |
8373 | GFP_KERNEL); | |
8374 | if (!vmas) | |
8375 | goto done; | |
edafccee | 8376 | |
41edf1a5 | 8377 | imu = kvmalloc(struct_size(imu, bvec, nr_pages), GFP_KERNEL); |
a2b4198c | 8378 | if (!imu) |
0a96bbe4 BM |
8379 | goto done; |
8380 | ||
8381 | ret = 0; | |
8382 | mmap_read_lock(current->mm); | |
8383 | pret = pin_user_pages(ubuf, nr_pages, FOLL_WRITE | FOLL_LONGTERM, | |
8384 | pages, vmas); | |
8385 | if (pret == nr_pages) { | |
8386 | /* don't support file backed memory */ | |
8387 | for (i = 0; i < nr_pages; i++) { | |
8388 | struct vm_area_struct *vma = vmas[i]; | |
8389 | ||
40dad765 PB |
8390 | if (vma_is_shmem(vma)) |
8391 | continue; | |
0a96bbe4 BM |
8392 | if (vma->vm_file && |
8393 | !is_file_hugepages(vma->vm_file)) { | |
8394 | ret = -EOPNOTSUPP; | |
8395 | break; | |
8396 | } | |
8397 | } | |
8398 | } else { | |
8399 | ret = pret < 0 ? pret : -EFAULT; | |
8400 | } | |
8401 | mmap_read_unlock(current->mm); | |
8402 | if (ret) { | |
8403 | /* | |
8404 | * if we did partial map, or found file backed vmas, | |
8405 | * release any pages we did get | |
8406 | */ | |
8407 | if (pret > 0) | |
8408 | unpin_user_pages(pages, pret); | |
0a96bbe4 BM |
8409 | goto done; |
8410 | } | |
8411 | ||
8412 | ret = io_buffer_account_pin(ctx, pages, pret, imu, last_hpage); | |
8413 | if (ret) { | |
8414 | unpin_user_pages(pages, pret); | |
0a96bbe4 BM |
8415 | goto done; |
8416 | } | |
8417 | ||
8418 | off = ubuf & ~PAGE_MASK; | |
8419 | size = iov->iov_len; | |
8420 | for (i = 0; i < nr_pages; i++) { | |
8421 | size_t vec_len; | |
8422 | ||
8423 | vec_len = min_t(size_t, size, PAGE_SIZE - off); | |
8424 | imu->bvec[i].bv_page = pages[i]; | |
8425 | imu->bvec[i].bv_len = vec_len; | |
8426 | imu->bvec[i].bv_offset = off; | |
8427 | off = 0; | |
8428 | size -= vec_len; | |
8429 | } | |
8430 | /* store original address for later verification */ | |
8431 | imu->ubuf = ubuf; | |
4751f53d | 8432 | imu->ubuf_end = ubuf + iov->iov_len; |
0a96bbe4 | 8433 | imu->nr_bvecs = nr_pages; |
41edf1a5 | 8434 | *pimu = imu; |
0a96bbe4 BM |
8435 | ret = 0; |
8436 | done: | |
41edf1a5 PB |
8437 | if (ret) |
8438 | kvfree(imu); | |
0a96bbe4 BM |
8439 | kvfree(pages); |
8440 | kvfree(vmas); | |
8441 | return ret; | |
8442 | } | |
8443 | ||
2b358604 | 8444 | static int io_buffers_map_alloc(struct io_ring_ctx *ctx, unsigned int nr_args) |
0a96bbe4 | 8445 | { |
87094465 PB |
8446 | ctx->user_bufs = kcalloc(nr_args, sizeof(*ctx->user_bufs), GFP_KERNEL); |
8447 | return ctx->user_bufs ? 0 : -ENOMEM; | |
2b358604 | 8448 | } |
edafccee | 8449 | |
2b358604 BM |
8450 | static int io_buffer_validate(struct iovec *iov) |
8451 | { | |
50e96989 PB |
8452 | unsigned long tmp, acct_len = iov->iov_len + (PAGE_SIZE - 1); |
8453 | ||
2b358604 BM |
8454 | /* |
8455 | * Don't impose further limits on the size and buffer | |
8456 | * constraints here, we'll -EINVAL later when IO is | |
8457 | * submitted if they are wrong. | |
8458 | */ | |
6224843d PB |
8459 | if (!iov->iov_base) |
8460 | return iov->iov_len ? -EFAULT : 0; | |
8461 | if (!iov->iov_len) | |
2b358604 | 8462 | return -EFAULT; |
edafccee | 8463 | |
2b358604 BM |
8464 | /* arbitrary limit, but we need something */ |
8465 | if (iov->iov_len > SZ_1G) | |
8466 | return -EFAULT; | |
edafccee | 8467 | |
50e96989 PB |
8468 | if (check_add_overflow((unsigned long)iov->iov_base, acct_len, &tmp)) |
8469 | return -EOVERFLOW; | |
8470 | ||
2b358604 BM |
8471 | return 0; |
8472 | } | |
edafccee | 8473 | |
2b358604 | 8474 | static int io_sqe_buffers_register(struct io_ring_ctx *ctx, void __user *arg, |
634d00df | 8475 | unsigned int nr_args, u64 __user *tags) |
2b358604 | 8476 | { |
bd54b6fe BM |
8477 | struct page *last_hpage = NULL; |
8478 | struct io_rsrc_data *data; | |
2b358604 BM |
8479 | int i, ret; |
8480 | struct iovec iov; | |
edafccee | 8481 | |
87094465 PB |
8482 | if (ctx->user_bufs) |
8483 | return -EBUSY; | |
489809e2 | 8484 | if (!nr_args || nr_args > IORING_MAX_REG_BUFFERS) |
87094465 | 8485 | return -EINVAL; |
bd54b6fe | 8486 | ret = io_rsrc_node_switch_start(ctx); |
2b358604 BM |
8487 | if (ret) |
8488 | return ret; | |
d878c816 PB |
8489 | ret = io_rsrc_data_alloc(ctx, io_rsrc_buf_put, tags, nr_args, &data); |
8490 | if (ret) | |
8491 | return ret; | |
bd54b6fe BM |
8492 | ret = io_buffers_map_alloc(ctx, nr_args); |
8493 | if (ret) { | |
bb6659cc | 8494 | io_rsrc_data_free(data); |
bd54b6fe BM |
8495 | return ret; |
8496 | } | |
edafccee | 8497 | |
87094465 | 8498 | for (i = 0; i < nr_args; i++, ctx->nr_user_bufs++) { |
edafccee JA |
8499 | ret = io_copy_iov(ctx, &iov, arg, i); |
8500 | if (ret) | |
0a96bbe4 | 8501 | break; |
2b358604 BM |
8502 | ret = io_buffer_validate(&iov); |
8503 | if (ret) | |
0a96bbe4 | 8504 | break; |
2d091d62 | 8505 | if (!iov.iov_base && *io_get_tag_slot(data, i)) { |
cf3770e7 CIK |
8506 | ret = -EINVAL; |
8507 | break; | |
8508 | } | |
edafccee | 8509 | |
41edf1a5 PB |
8510 | ret = io_sqe_buffer_register(ctx, &iov, &ctx->user_bufs[i], |
8511 | &last_hpage); | |
0a96bbe4 BM |
8512 | if (ret) |
8513 | break; | |
edafccee | 8514 | } |
0a96bbe4 | 8515 | |
bd54b6fe | 8516 | WARN_ON_ONCE(ctx->buf_data); |
0a96bbe4 | 8517 | |
bd54b6fe BM |
8518 | ctx->buf_data = data; |
8519 | if (ret) | |
8520 | __io_sqe_buffers_unregister(ctx); | |
8521 | else | |
8522 | io_rsrc_node_switch(ctx, NULL); | |
edafccee JA |
8523 | return ret; |
8524 | } | |
8525 | ||
634d00df PB |
8526 | static int __io_sqe_buffers_update(struct io_ring_ctx *ctx, |
8527 | struct io_uring_rsrc_update2 *up, | |
8528 | unsigned int nr_args) | |
8529 | { | |
8530 | u64 __user *tags = u64_to_user_ptr(up->tags); | |
8531 | struct iovec iov, __user *iovs = u64_to_user_ptr(up->data); | |
634d00df PB |
8532 | struct page *last_hpage = NULL; |
8533 | bool needs_switch = false; | |
8534 | __u32 done; | |
8535 | int i, err; | |
8536 | ||
8537 | if (!ctx->buf_data) | |
8538 | return -ENXIO; | |
8539 | if (up->offset + nr_args > ctx->nr_user_bufs) | |
8540 | return -EINVAL; | |
8541 | ||
8542 | for (done = 0; done < nr_args; done++) { | |
0b8c0e7c PB |
8543 | struct io_mapped_ubuf *imu; |
8544 | int offset = up->offset + done; | |
634d00df PB |
8545 | u64 tag = 0; |
8546 | ||
8547 | err = io_copy_iov(ctx, &iov, iovs, done); | |
8548 | if (err) | |
8549 | break; | |
8550 | if (tags && copy_from_user(&tag, &tags[done], sizeof(tag))) { | |
8551 | err = -EFAULT; | |
8552 | break; | |
8553 | } | |
0b8c0e7c PB |
8554 | err = io_buffer_validate(&iov); |
8555 | if (err) | |
8556 | break; | |
cf3770e7 CIK |
8557 | if (!iov.iov_base && tag) { |
8558 | err = -EINVAL; | |
8559 | break; | |
8560 | } | |
0b8c0e7c PB |
8561 | err = io_sqe_buffer_register(ctx, &iov, &imu, &last_hpage); |
8562 | if (err) | |
8563 | break; | |
634d00df | 8564 | |
0b8c0e7c | 8565 | i = array_index_nospec(offset, ctx->nr_user_bufs); |
6224843d | 8566 | if (ctx->user_bufs[i] != ctx->dummy_ubuf) { |
0b8c0e7c PB |
8567 | err = io_queue_rsrc_removal(ctx->buf_data, offset, |
8568 | ctx->rsrc_node, ctx->user_bufs[i]); | |
8569 | if (unlikely(err)) { | |
8570 | io_buffer_unmap(ctx, &imu); | |
634d00df | 8571 | break; |
0b8c0e7c | 8572 | } |
634d00df PB |
8573 | ctx->user_bufs[i] = NULL; |
8574 | needs_switch = true; | |
8575 | } | |
8576 | ||
0b8c0e7c | 8577 | ctx->user_bufs[i] = imu; |
2d091d62 | 8578 | *io_get_tag_slot(ctx->buf_data, offset) = tag; |
634d00df PB |
8579 | } |
8580 | ||
8581 | if (needs_switch) | |
8582 | io_rsrc_node_switch(ctx, ctx->buf_data); | |
8583 | return done ? done : err; | |
8584 | } | |
8585 | ||
9b402849 JA |
8586 | static int io_eventfd_register(struct io_ring_ctx *ctx, void __user *arg) |
8587 | { | |
8588 | __s32 __user *fds = arg; | |
8589 | int fd; | |
8590 | ||
8591 | if (ctx->cq_ev_fd) | |
8592 | return -EBUSY; | |
8593 | ||
8594 | if (copy_from_user(&fd, fds, sizeof(*fds))) | |
8595 | return -EFAULT; | |
8596 | ||
8597 | ctx->cq_ev_fd = eventfd_ctx_fdget(fd); | |
8598 | if (IS_ERR(ctx->cq_ev_fd)) { | |
8599 | int ret = PTR_ERR(ctx->cq_ev_fd); | |
fe7e3257 | 8600 | |
9b402849 JA |
8601 | ctx->cq_ev_fd = NULL; |
8602 | return ret; | |
8603 | } | |
8604 | ||
8605 | return 0; | |
8606 | } | |
8607 | ||
8608 | static int io_eventfd_unregister(struct io_ring_ctx *ctx) | |
8609 | { | |
8610 | if (ctx->cq_ev_fd) { | |
8611 | eventfd_ctx_put(ctx->cq_ev_fd); | |
8612 | ctx->cq_ev_fd = NULL; | |
8613 | return 0; | |
8614 | } | |
8615 | ||
8616 | return -ENXIO; | |
8617 | } | |
8618 | ||
5a2e745d JA |
8619 | static void io_destroy_buffers(struct io_ring_ctx *ctx) |
8620 | { | |
9e15c3a0 JA |
8621 | struct io_buffer *buf; |
8622 | unsigned long index; | |
8623 | ||
8624 | xa_for_each(&ctx->io_buffers, index, buf) | |
8625 | __io_remove_buffers(ctx, buf, index, -1U); | |
5a2e745d JA |
8626 | } |
8627 | ||
68e68ee6 | 8628 | static void io_req_cache_free(struct list_head *list, struct task_struct *tsk) |
1b4c351f | 8629 | { |
68e68ee6 | 8630 | struct io_kiocb *req, *nxt; |
1b4c351f | 8631 | |
68e68ee6 JA |
8632 | list_for_each_entry_safe(req, nxt, list, compl.list) { |
8633 | if (tsk && req->task != tsk) | |
8634 | continue; | |
1b4c351f JA |
8635 | list_del(&req->compl.list); |
8636 | kmem_cache_free(req_cachep, req); | |
8637 | } | |
8638 | } | |
8639 | ||
4010fec4 | 8640 | static void io_req_caches_free(struct io_ring_ctx *ctx) |
2b188cc1 | 8641 | { |
bf019da7 | 8642 | struct io_submit_state *submit_state = &ctx->submit_state; |
e5547d2c | 8643 | struct io_comp_state *cs = &ctx->submit_state.comp; |
bf019da7 | 8644 | |
9a4fdbd8 JA |
8645 | mutex_lock(&ctx->uring_lock); |
8646 | ||
8e5c66c4 | 8647 | if (submit_state->free_reqs) { |
9a4fdbd8 JA |
8648 | kmem_cache_free_bulk(req_cachep, submit_state->free_reqs, |
8649 | submit_state->reqs); | |
8e5c66c4 PB |
8650 | submit_state->free_reqs = 0; |
8651 | } | |
9a4fdbd8 | 8652 | |
dac7a098 | 8653 | io_flush_cached_locked_reqs(ctx, cs); |
e5547d2c | 8654 | io_req_cache_free(&cs->free_list, NULL); |
9a4fdbd8 JA |
8655 | mutex_unlock(&ctx->uring_lock); |
8656 | } | |
8657 | ||
43597aac | 8658 | static void io_wait_rsrc_data(struct io_rsrc_data *data) |
2b188cc1 | 8659 | { |
43597aac | 8660 | if (data && !atomic_dec_and_test(&data->refs)) |
bd54b6fe | 8661 | wait_for_completion(&data->done); |
bd54b6fe | 8662 | } |
04fc6c80 | 8663 | |
2b188cc1 JA |
8664 | static void io_ring_ctx_free(struct io_ring_ctx *ctx) |
8665 | { | |
37d1e2e3 | 8666 | io_sq_thread_finish(ctx); |
2aede0e4 | 8667 | |
37d1e2e3 | 8668 | if (ctx->mm_account) { |
2aede0e4 JA |
8669 | mmdrop(ctx->mm_account); |
8670 | ctx->mm_account = NULL; | |
30975825 | 8671 | } |
def596e9 | 8672 | |
43597aac PB |
8673 | /* __io_rsrc_put_work() may need uring_lock to progress, wait w/o it */ |
8674 | io_wait_rsrc_data(ctx->buf_data); | |
8675 | io_wait_rsrc_data(ctx->file_data); | |
8676 | ||
8bad28d8 | 8677 | mutex_lock(&ctx->uring_lock); |
43597aac | 8678 | if (ctx->buf_data) |
bd54b6fe | 8679 | __io_sqe_buffers_unregister(ctx); |
43597aac | 8680 | if (ctx->file_data) |
08480400 | 8681 | __io_sqe_files_unregister(ctx); |
c4ea060e PB |
8682 | if (ctx->rings) |
8683 | __io_cqring_overflow_flush(ctx, true); | |
8bad28d8 | 8684 | mutex_unlock(&ctx->uring_lock); |
9b402849 | 8685 | io_eventfd_unregister(ctx); |
5a2e745d | 8686 | io_destroy_buffers(ctx); |
07db298a PB |
8687 | if (ctx->sq_creds) |
8688 | put_cred(ctx->sq_creds); | |
def596e9 | 8689 | |
a7f0ed5a PB |
8690 | /* there are no registered resources left, nobody uses it */ |
8691 | if (ctx->rsrc_node) | |
8692 | io_rsrc_node_destroy(ctx->rsrc_node); | |
8dd03afe | 8693 | if (ctx->rsrc_backup_node) |
b895c9a6 | 8694 | io_rsrc_node_destroy(ctx->rsrc_backup_node); |
a7f0ed5a PB |
8695 | flush_delayed_work(&ctx->rsrc_put_work); |
8696 | ||
8697 | WARN_ON_ONCE(!list_empty(&ctx->rsrc_ref_list)); | |
8698 | WARN_ON_ONCE(!llist_empty(&ctx->rsrc_put_llist)); | |
def596e9 | 8699 | |
2b188cc1 | 8700 | #if defined(CONFIG_UNIX) |
355e8d26 EB |
8701 | if (ctx->ring_sock) { |
8702 | ctx->ring_sock->file = NULL; /* so that iput() is called */ | |
2b188cc1 | 8703 | sock_release(ctx->ring_sock); |
355e8d26 | 8704 | } |
2b188cc1 JA |
8705 | #endif |
8706 | ||
75b28aff | 8707 | io_mem_free(ctx->rings); |
2b188cc1 | 8708 | io_mem_free(ctx->sq_sqes); |
2b188cc1 JA |
8709 | |
8710 | percpu_ref_exit(&ctx->refs); | |
2b188cc1 | 8711 | free_uid(ctx->user); |
4010fec4 | 8712 | io_req_caches_free(ctx); |
e941894e JA |
8713 | if (ctx->hash_map) |
8714 | io_wq_put_hash(ctx->hash_map); | |
78076bb6 | 8715 | kfree(ctx->cancel_hash); |
6224843d | 8716 | kfree(ctx->dummy_ubuf); |
2b188cc1 JA |
8717 | kfree(ctx); |
8718 | } | |
8719 | ||
8720 | static __poll_t io_uring_poll(struct file *file, poll_table *wait) | |
8721 | { | |
8722 | struct io_ring_ctx *ctx = file->private_data; | |
8723 | __poll_t mask = 0; | |
8724 | ||
311997b3 | 8725 | poll_wait(file, &ctx->poll_wait, wait); |
4f7067c3 SB |
8726 | /* |
8727 | * synchronizes with barrier from wq_has_sleeper call in | |
8728 | * io_commit_cqring | |
8729 | */ | |
2b188cc1 | 8730 | smp_rmb(); |
90554200 | 8731 | if (!io_sqring_full(ctx)) |
2b188cc1 | 8732 | mask |= EPOLLOUT | EPOLLWRNORM; |
ed670c3f HX |
8733 | |
8734 | /* | |
8735 | * Don't flush cqring overflow list here, just do a simple check. | |
8736 | * Otherwise there could possible be ABBA deadlock: | |
8737 | * CPU0 CPU1 | |
8738 | * ---- ---- | |
8739 | * lock(&ctx->uring_lock); | |
8740 | * lock(&ep->mtx); | |
8741 | * lock(&ctx->uring_lock); | |
8742 | * lock(&ep->mtx); | |
8743 | * | |
8744 | * Users may get EPOLLIN meanwhile seeing nothing in cqring, this | |
8745 | * pushs them to do the flush. | |
8746 | */ | |
5ed7a37d | 8747 | if (io_cqring_events(ctx) || test_bit(0, &ctx->check_cq_overflow)) |
2b188cc1 JA |
8748 | mask |= EPOLLIN | EPOLLRDNORM; |
8749 | ||
8750 | return mask; | |
8751 | } | |
8752 | ||
8753 | static int io_uring_fasync(int fd, struct file *file, int on) | |
8754 | { | |
8755 | struct io_ring_ctx *ctx = file->private_data; | |
8756 | ||
8757 | return fasync_helper(fd, file, on, &ctx->cq_fasync); | |
8758 | } | |
8759 | ||
0bead8cd | 8760 | static int io_unregister_personality(struct io_ring_ctx *ctx, unsigned id) |
071698e1 | 8761 | { |
4379bf8b | 8762 | const struct cred *creds; |
071698e1 | 8763 | |
61cf9370 | 8764 | creds = xa_erase(&ctx->personalities, id); |
4379bf8b JA |
8765 | if (creds) { |
8766 | put_cred(creds); | |
0bead8cd | 8767 | return 0; |
1e6fa521 | 8768 | } |
0bead8cd YD |
8769 | |
8770 | return -EINVAL; | |
8771 | } | |
8772 | ||
d56d938b PB |
8773 | struct io_tctx_exit { |
8774 | struct callback_head task_work; | |
8775 | struct completion completion; | |
baf186c4 | 8776 | struct io_ring_ctx *ctx; |
d56d938b PB |
8777 | }; |
8778 | ||
8779 | static void io_tctx_exit_cb(struct callback_head *cb) | |
8780 | { | |
8781 | struct io_uring_task *tctx = current->io_uring; | |
8782 | struct io_tctx_exit *work; | |
8783 | ||
8784 | work = container_of(cb, struct io_tctx_exit, task_work); | |
8785 | /* | |
8786 | * When @in_idle, we're in cancellation and it's racy to remove the | |
8787 | * node. It'll be removed by the end of cancellation, just ignore it. | |
8788 | */ | |
8789 | if (!atomic_read(&tctx->in_idle)) | |
eef51daa | 8790 | io_uring_del_tctx_node((unsigned long)work->ctx); |
d56d938b PB |
8791 | complete(&work->completion); |
8792 | } | |
8793 | ||
28090c13 PB |
8794 | static bool io_cancel_ctx_cb(struct io_wq_work *work, void *data) |
8795 | { | |
8796 | struct io_kiocb *req = container_of(work, struct io_kiocb, work); | |
8797 | ||
8798 | return req->ctx == data; | |
8799 | } | |
8800 | ||
85faa7b8 JA |
8801 | static void io_ring_exit_work(struct work_struct *work) |
8802 | { | |
d56d938b | 8803 | struct io_ring_ctx *ctx = container_of(work, struct io_ring_ctx, exit_work); |
b5bb3a24 | 8804 | unsigned long timeout = jiffies + HZ * 60 * 5; |
d56d938b PB |
8805 | struct io_tctx_exit exit; |
8806 | struct io_tctx_node *node; | |
8807 | int ret; | |
85faa7b8 | 8808 | |
56952e91 JA |
8809 | /* |
8810 | * If we're doing polled IO and end up having requests being | |
8811 | * submitted async (out-of-line), then completions can come in while | |
8812 | * we're waiting for refs to drop. We need to reap these manually, | |
8813 | * as nobody else will be looking for them. | |
8814 | */ | |
b2edc0a7 | 8815 | do { |
3dd0c97a | 8816 | io_uring_try_cancel_requests(ctx, NULL, true); |
28090c13 PB |
8817 | if (ctx->sq_data) { |
8818 | struct io_sq_data *sqd = ctx->sq_data; | |
8819 | struct task_struct *tsk; | |
8820 | ||
8821 | io_sq_thread_park(sqd); | |
8822 | tsk = sqd->thread; | |
8823 | if (tsk && tsk->io_uring && tsk->io_uring->io_wq) | |
8824 | io_wq_cancel_cb(tsk->io_uring->io_wq, | |
8825 | io_cancel_ctx_cb, ctx, true); | |
8826 | io_sq_thread_unpark(sqd); | |
8827 | } | |
b5bb3a24 PB |
8828 | |
8829 | WARN_ON_ONCE(time_after(jiffies, timeout)); | |
b2edc0a7 | 8830 | } while (!wait_for_completion_timeout(&ctx->ref_comp, HZ/20)); |
d56d938b | 8831 | |
7f00651a PB |
8832 | init_completion(&exit.completion); |
8833 | init_task_work(&exit.task_work, io_tctx_exit_cb); | |
8834 | exit.ctx = ctx; | |
89b5066e PB |
8835 | /* |
8836 | * Some may use context even when all refs and requests have been put, | |
8837 | * and they are free to do so while still holding uring_lock or | |
5b0a6acc | 8838 | * completion_lock, see io_req_task_submit(). Apart from other work, |
89b5066e PB |
8839 | * this lock/unlock section also waits them to finish. |
8840 | */ | |
d56d938b PB |
8841 | mutex_lock(&ctx->uring_lock); |
8842 | while (!list_empty(&ctx->tctx_list)) { | |
b5bb3a24 PB |
8843 | WARN_ON_ONCE(time_after(jiffies, timeout)); |
8844 | ||
d56d938b PB |
8845 | node = list_first_entry(&ctx->tctx_list, struct io_tctx_node, |
8846 | ctx_node); | |
7f00651a PB |
8847 | /* don't spin on a single task if cancellation failed */ |
8848 | list_rotate_left(&ctx->tctx_list); | |
d56d938b PB |
8849 | ret = task_work_add(node->task, &exit.task_work, TWA_SIGNAL); |
8850 | if (WARN_ON_ONCE(ret)) | |
8851 | continue; | |
8852 | wake_up_process(node->task); | |
8853 | ||
8854 | mutex_unlock(&ctx->uring_lock); | |
8855 | wait_for_completion(&exit.completion); | |
d56d938b PB |
8856 | mutex_lock(&ctx->uring_lock); |
8857 | } | |
8858 | mutex_unlock(&ctx->uring_lock); | |
89b5066e PB |
8859 | spin_lock_irq(&ctx->completion_lock); |
8860 | spin_unlock_irq(&ctx->completion_lock); | |
d56d938b | 8861 | |
85faa7b8 JA |
8862 | io_ring_ctx_free(ctx); |
8863 | } | |
8864 | ||
80c4cbdb PB |
8865 | /* Returns true if we found and killed one or more timeouts */ |
8866 | static bool io_kill_timeouts(struct io_ring_ctx *ctx, struct task_struct *tsk, | |
3dd0c97a | 8867 | bool cancel_all) |
80c4cbdb PB |
8868 | { |
8869 | struct io_kiocb *req, *tmp; | |
8870 | int canceled = 0; | |
8871 | ||
8872 | spin_lock_irq(&ctx->completion_lock); | |
8873 | list_for_each_entry_safe(req, tmp, &ctx->timeout_list, timeout.list) { | |
3dd0c97a | 8874 | if (io_match_task(req, tsk, cancel_all)) { |
80c4cbdb PB |
8875 | io_kill_timeout(req, -ECANCELED); |
8876 | canceled++; | |
8877 | } | |
8878 | } | |
51520426 PB |
8879 | if (canceled != 0) |
8880 | io_commit_cqring(ctx); | |
80c4cbdb | 8881 | spin_unlock_irq(&ctx->completion_lock); |
80c4cbdb PB |
8882 | if (canceled != 0) |
8883 | io_cqring_ev_posted(ctx); | |
8884 | return canceled != 0; | |
8885 | } | |
8886 | ||
2b188cc1 JA |
8887 | static void io_ring_ctx_wait_and_kill(struct io_ring_ctx *ctx) |
8888 | { | |
61cf9370 MWO |
8889 | unsigned long index; |
8890 | struct creds *creds; | |
8891 | ||
2b188cc1 JA |
8892 | mutex_lock(&ctx->uring_lock); |
8893 | percpu_ref_kill(&ctx->refs); | |
634578f8 | 8894 | if (ctx->rings) |
6c2450ae | 8895 | __io_cqring_overflow_flush(ctx, true); |
61cf9370 MWO |
8896 | xa_for_each(&ctx->personalities, index, creds) |
8897 | io_unregister_personality(ctx, index); | |
2b188cc1 JA |
8898 | mutex_unlock(&ctx->uring_lock); |
8899 | ||
3dd0c97a PB |
8900 | io_kill_timeouts(ctx, NULL, true); |
8901 | io_poll_remove_all(ctx, NULL, true); | |
561fb04a | 8902 | |
15dff286 | 8903 | /* if we failed setting up the ctx, we might not have any rings */ |
b2edc0a7 | 8904 | io_iopoll_try_reap_events(ctx); |
309fc03a | 8905 | |
85faa7b8 | 8906 | INIT_WORK(&ctx->exit_work, io_ring_exit_work); |
fc666777 JA |
8907 | /* |
8908 | * Use system_unbound_wq to avoid spawning tons of event kworkers | |
8909 | * if we're exiting a ton of rings at the same time. It just adds | |
8910 | * noise and overhead, there's no discernable change in runtime | |
8911 | * over using system_wq. | |
8912 | */ | |
8913 | queue_work(system_unbound_wq, &ctx->exit_work); | |
2b188cc1 JA |
8914 | } |
8915 | ||
8916 | static int io_uring_release(struct inode *inode, struct file *file) | |
8917 | { | |
8918 | struct io_ring_ctx *ctx = file->private_data; | |
8919 | ||
8920 | file->private_data = NULL; | |
8921 | io_ring_ctx_wait_and_kill(ctx); | |
8922 | return 0; | |
8923 | } | |
8924 | ||
f6edbabb PB |
8925 | struct io_task_cancel { |
8926 | struct task_struct *task; | |
3dd0c97a | 8927 | bool all; |
f6edbabb | 8928 | }; |
f254ac04 | 8929 | |
f6edbabb | 8930 | static bool io_cancel_task_cb(struct io_wq_work *work, void *data) |
b711d4ea | 8931 | { |
9a472ef7 | 8932 | struct io_kiocb *req = container_of(work, struct io_kiocb, work); |
f6edbabb | 8933 | struct io_task_cancel *cancel = data; |
9a472ef7 PB |
8934 | bool ret; |
8935 | ||
3dd0c97a | 8936 | if (!cancel->all && (req->flags & REQ_F_LINK_TIMEOUT)) { |
9a472ef7 PB |
8937 | unsigned long flags; |
8938 | struct io_ring_ctx *ctx = req->ctx; | |
8939 | ||
8940 | /* protect against races with linked timeouts */ | |
8941 | spin_lock_irqsave(&ctx->completion_lock, flags); | |
3dd0c97a | 8942 | ret = io_match_task(req, cancel->task, cancel->all); |
9a472ef7 PB |
8943 | spin_unlock_irqrestore(&ctx->completion_lock, flags); |
8944 | } else { | |
3dd0c97a | 8945 | ret = io_match_task(req, cancel->task, cancel->all); |
9a472ef7 PB |
8946 | } |
8947 | return ret; | |
b711d4ea JA |
8948 | } |
8949 | ||
e1915f76 | 8950 | static bool io_cancel_defer_files(struct io_ring_ctx *ctx, |
3dd0c97a | 8951 | struct task_struct *task, bool cancel_all) |
b7ddce3c | 8952 | { |
e1915f76 | 8953 | struct io_defer_entry *de; |
b7ddce3c PB |
8954 | LIST_HEAD(list); |
8955 | ||
8956 | spin_lock_irq(&ctx->completion_lock); | |
8957 | list_for_each_entry_reverse(de, &ctx->defer_list, list) { | |
3dd0c97a | 8958 | if (io_match_task(de->req, task, cancel_all)) { |
b7ddce3c PB |
8959 | list_cut_position(&list, &ctx->defer_list, &de->list); |
8960 | break; | |
8961 | } | |
8962 | } | |
8963 | spin_unlock_irq(&ctx->completion_lock); | |
e1915f76 PB |
8964 | if (list_empty(&list)) |
8965 | return false; | |
b7ddce3c PB |
8966 | |
8967 | while (!list_empty(&list)) { | |
8968 | de = list_first_entry(&list, struct io_defer_entry, list); | |
8969 | list_del_init(&de->list); | |
f41db273 | 8970 | io_req_complete_failed(de->req, -ECANCELED); |
b7ddce3c PB |
8971 | kfree(de); |
8972 | } | |
e1915f76 | 8973 | return true; |
b7ddce3c PB |
8974 | } |
8975 | ||
1b00764f PB |
8976 | static bool io_uring_try_cancel_iowq(struct io_ring_ctx *ctx) |
8977 | { | |
8978 | struct io_tctx_node *node; | |
8979 | enum io_wq_cancel cret; | |
8980 | bool ret = false; | |
8981 | ||
8982 | mutex_lock(&ctx->uring_lock); | |
8983 | list_for_each_entry(node, &ctx->tctx_list, ctx_node) { | |
8984 | struct io_uring_task *tctx = node->task->io_uring; | |
8985 | ||
8986 | /* | |
8987 | * io_wq will stay alive while we hold uring_lock, because it's | |
8988 | * killed after ctx nodes, which requires to take the lock. | |
8989 | */ | |
8990 | if (!tctx || !tctx->io_wq) | |
8991 | continue; | |
8992 | cret = io_wq_cancel_cb(tctx->io_wq, io_cancel_ctx_cb, ctx, true); | |
8993 | ret |= (cret != IO_WQ_CANCEL_NOTFOUND); | |
8994 | } | |
8995 | mutex_unlock(&ctx->uring_lock); | |
8996 | ||
8997 | return ret; | |
8998 | } | |
8999 | ||
9936c7c2 PB |
9000 | static void io_uring_try_cancel_requests(struct io_ring_ctx *ctx, |
9001 | struct task_struct *task, | |
3dd0c97a | 9002 | bool cancel_all) |
9936c7c2 | 9003 | { |
3dd0c97a | 9004 | struct io_task_cancel cancel = { .task = task, .all = cancel_all, }; |
1b00764f | 9005 | struct io_uring_task *tctx = task ? task->io_uring : NULL; |
9936c7c2 PB |
9006 | |
9007 | while (1) { | |
9008 | enum io_wq_cancel cret; | |
9009 | bool ret = false; | |
9010 | ||
1b00764f PB |
9011 | if (!task) { |
9012 | ret |= io_uring_try_cancel_iowq(ctx); | |
9013 | } else if (tctx && tctx->io_wq) { | |
9014 | /* | |
9015 | * Cancels requests of all rings, not only @ctx, but | |
9016 | * it's fine as the task is in exit/exec. | |
9017 | */ | |
5aa75ed5 | 9018 | cret = io_wq_cancel_cb(tctx->io_wq, io_cancel_task_cb, |
9936c7c2 PB |
9019 | &cancel, true); |
9020 | ret |= (cret != IO_WQ_CANCEL_NOTFOUND); | |
9021 | } | |
9022 | ||
9023 | /* SQPOLL thread does its own polling */ | |
3dd0c97a | 9024 | if ((!(ctx->flags & IORING_SETUP_SQPOLL) && cancel_all) || |
d052d1d6 | 9025 | (ctx->sq_data && ctx->sq_data->thread == current)) { |
9936c7c2 PB |
9026 | while (!list_empty_careful(&ctx->iopoll_list)) { |
9027 | io_iopoll_try_reap_events(ctx); | |
9028 | ret = true; | |
9029 | } | |
9030 | } | |
9031 | ||
3dd0c97a PB |
9032 | ret |= io_cancel_defer_files(ctx, task, cancel_all); |
9033 | ret |= io_poll_remove_all(ctx, task, cancel_all); | |
9034 | ret |= io_kill_timeouts(ctx, task, cancel_all); | |
e5dc480d PB |
9035 | if (task) |
9036 | ret |= io_run_task_work(); | |
9936c7c2 PB |
9037 | if (!ret) |
9038 | break; | |
9039 | cond_resched(); | |
9040 | } | |
9041 | } | |
9042 | ||
eef51daa | 9043 | static int __io_uring_add_tctx_node(struct io_ring_ctx *ctx) |
0f212204 | 9044 | { |
236434c3 | 9045 | struct io_uring_task *tctx = current->io_uring; |
13bf43f5 | 9046 | struct io_tctx_node *node; |
a528b04e | 9047 | int ret; |
236434c3 MWO |
9048 | |
9049 | if (unlikely(!tctx)) { | |
5aa75ed5 | 9050 | ret = io_uring_alloc_task_context(current, ctx); |
0f212204 JA |
9051 | if (unlikely(ret)) |
9052 | return ret; | |
236434c3 | 9053 | tctx = current->io_uring; |
0f212204 | 9054 | } |
cf27f3b1 PB |
9055 | if (!xa_load(&tctx->xa, (unsigned long)ctx)) { |
9056 | node = kmalloc(sizeof(*node), GFP_KERNEL); | |
9057 | if (!node) | |
9058 | return -ENOMEM; | |
9059 | node->ctx = ctx; | |
9060 | node->task = current; | |
13bf43f5 | 9061 | |
cf27f3b1 PB |
9062 | ret = xa_err(xa_store(&tctx->xa, (unsigned long)ctx, |
9063 | node, GFP_KERNEL)); | |
9064 | if (ret) { | |
9065 | kfree(node); | |
9066 | return ret; | |
0f212204 | 9067 | } |
cf27f3b1 PB |
9068 | |
9069 | mutex_lock(&ctx->uring_lock); | |
9070 | list_add(&node->ctx_node, &ctx->tctx_list); | |
9071 | mutex_unlock(&ctx->uring_lock); | |
0f212204 | 9072 | } |
cf27f3b1 | 9073 | tctx->last = ctx; |
0f212204 JA |
9074 | return 0; |
9075 | } | |
9076 | ||
cf27f3b1 PB |
9077 | /* |
9078 | * Note that this task has used io_uring. We use it for cancelation purposes. | |
9079 | */ | |
eef51daa | 9080 | static inline int io_uring_add_tctx_node(struct io_ring_ctx *ctx) |
cf27f3b1 PB |
9081 | { |
9082 | struct io_uring_task *tctx = current->io_uring; | |
9083 | ||
9084 | if (likely(tctx && tctx->last == ctx)) | |
9085 | return 0; | |
eef51daa | 9086 | return __io_uring_add_tctx_node(ctx); |
cf27f3b1 PB |
9087 | } |
9088 | ||
0f212204 JA |
9089 | /* |
9090 | * Remove this io_uring_file -> task mapping. | |
9091 | */ | |
eef51daa | 9092 | static void io_uring_del_tctx_node(unsigned long index) |
0f212204 JA |
9093 | { |
9094 | struct io_uring_task *tctx = current->io_uring; | |
13bf43f5 | 9095 | struct io_tctx_node *node; |
2941267b | 9096 | |
eebd2e37 PB |
9097 | if (!tctx) |
9098 | return; | |
13bf43f5 PB |
9099 | node = xa_erase(&tctx->xa, index); |
9100 | if (!node) | |
2941267b | 9101 | return; |
0f212204 | 9102 | |
13bf43f5 PB |
9103 | WARN_ON_ONCE(current != node->task); |
9104 | WARN_ON_ONCE(list_empty(&node->ctx_node)); | |
9105 | ||
9106 | mutex_lock(&node->ctx->uring_lock); | |
9107 | list_del(&node->ctx_node); | |
9108 | mutex_unlock(&node->ctx->uring_lock); | |
9109 | ||
baf186c4 | 9110 | if (tctx->last == node->ctx) |
0f212204 | 9111 | tctx->last = NULL; |
13bf43f5 | 9112 | kfree(node); |
0f212204 JA |
9113 | } |
9114 | ||
8452d4a6 | 9115 | static void io_uring_clean_tctx(struct io_uring_task *tctx) |
de7f1d9e | 9116 | { |
ba5ef6dc | 9117 | struct io_wq *wq = tctx->io_wq; |
13bf43f5 | 9118 | struct io_tctx_node *node; |
de7f1d9e PB |
9119 | unsigned long index; |
9120 | ||
13bf43f5 | 9121 | xa_for_each(&tctx->xa, index, node) |
eef51daa | 9122 | io_uring_del_tctx_node(index); |
b16ef427 ME |
9123 | if (wq) { |
9124 | /* | |
9125 | * Must be after io_uring_del_task_file() (removes nodes under | |
9126 | * uring_lock) to avoid race with io_uring_try_cancel_iowq(). | |
9127 | */ | |
9128 | tctx->io_wq = NULL; | |
ba5ef6dc | 9129 | io_wq_put_and_exit(wq); |
b16ef427 | 9130 | } |
de7f1d9e PB |
9131 | } |
9132 | ||
3f48cf18 | 9133 | static s64 tctx_inflight(struct io_uring_task *tctx, bool tracked) |
521d6a73 | 9134 | { |
3f48cf18 PB |
9135 | if (tracked) |
9136 | return atomic_read(&tctx->inflight_tracked); | |
521d6a73 PB |
9137 | return percpu_counter_sum(&tctx->inflight); |
9138 | } | |
9139 | ||
09899b19 PB |
9140 | static void io_uring_drop_tctx_refs(struct task_struct *task) |
9141 | { | |
9142 | struct io_uring_task *tctx = task->io_uring; | |
9143 | unsigned int refs = tctx->cached_refs; | |
9144 | ||
9145 | tctx->cached_refs = 0; | |
9146 | percpu_counter_sub(&tctx->inflight, refs); | |
9147 | put_task_struct_many(task, refs); | |
9148 | } | |
9149 | ||
78cc687b PB |
9150 | /* |
9151 | * Find any io_uring ctx that this task has registered or done IO on, and cancel | |
9152 | * requests. @sqd should be not-null IIF it's an SQPOLL thread cancellation. | |
9153 | */ | |
9154 | static void io_uring_cancel_generic(bool cancel_all, struct io_sq_data *sqd) | |
0e9ddb39 | 9155 | { |
521d6a73 | 9156 | struct io_uring_task *tctx = current->io_uring; |
734551df | 9157 | struct io_ring_ctx *ctx; |
0e9ddb39 PB |
9158 | s64 inflight; |
9159 | DEFINE_WAIT(wait); | |
fdaf083c | 9160 | |
78cc687b PB |
9161 | WARN_ON_ONCE(sqd && sqd->thread != current); |
9162 | ||
6d042ffb PO |
9163 | if (!current->io_uring) |
9164 | return; | |
17a91051 PB |
9165 | if (tctx->io_wq) |
9166 | io_wq_exit_start(tctx->io_wq); | |
9167 | ||
09899b19 | 9168 | io_uring_drop_tctx_refs(current); |
0e9ddb39 PB |
9169 | atomic_inc(&tctx->in_idle); |
9170 | do { | |
9171 | /* read completions before cancelations */ | |
78cc687b | 9172 | inflight = tctx_inflight(tctx, !cancel_all); |
0e9ddb39 PB |
9173 | if (!inflight) |
9174 | break; | |
fdaf083c | 9175 | |
78cc687b PB |
9176 | if (!sqd) { |
9177 | struct io_tctx_node *node; | |
9178 | unsigned long index; | |
0f212204 | 9179 | |
78cc687b PB |
9180 | xa_for_each(&tctx->xa, index, node) { |
9181 | /* sqpoll task will cancel all its requests */ | |
9182 | if (node->ctx->sq_data) | |
9183 | continue; | |
9184 | io_uring_try_cancel_requests(node->ctx, current, | |
9185 | cancel_all); | |
9186 | } | |
9187 | } else { | |
9188 | list_for_each_entry(ctx, &sqd->ctx_list, sqd_list) | |
9189 | io_uring_try_cancel_requests(ctx, current, | |
9190 | cancel_all); | |
9191 | } | |
17a91051 | 9192 | |
0f212204 | 9193 | prepare_to_wait(&tctx->wait, &wait, TASK_UNINTERRUPTIBLE); |
0f212204 | 9194 | /* |
a1bb3cd5 PB |
9195 | * If we've seen completions, retry without waiting. This |
9196 | * avoids a race where a completion comes in before we did | |
9197 | * prepare_to_wait(). | |
0f212204 | 9198 | */ |
3dd0c97a | 9199 | if (inflight == tctx_inflight(tctx, !cancel_all)) |
a1bb3cd5 | 9200 | schedule(); |
f57555ed | 9201 | finish_wait(&tctx->wait, &wait); |
d8a6df10 | 9202 | } while (1); |
fdaf083c | 9203 | atomic_dec(&tctx->in_idle); |
de7f1d9e | 9204 | |
8452d4a6 | 9205 | io_uring_clean_tctx(tctx); |
3dd0c97a | 9206 | if (cancel_all) { |
3f48cf18 PB |
9207 | /* for exec all current's requests should be gone, kill tctx */ |
9208 | __io_uring_free(current); | |
9209 | } | |
44e728b8 PB |
9210 | } |
9211 | ||
78cc687b PB |
9212 | void __io_uring_cancel(struct files_struct *files) |
9213 | { | |
9214 | io_uring_cancel_generic(!files, NULL); | |
9215 | } | |
9216 | ||
6c5c240e RP |
9217 | static void *io_uring_validate_mmap_request(struct file *file, |
9218 | loff_t pgoff, size_t sz) | |
2b188cc1 | 9219 | { |
2b188cc1 | 9220 | struct io_ring_ctx *ctx = file->private_data; |
6c5c240e | 9221 | loff_t offset = pgoff << PAGE_SHIFT; |
2b188cc1 JA |
9222 | struct page *page; |
9223 | void *ptr; | |
9224 | ||
9225 | switch (offset) { | |
9226 | case IORING_OFF_SQ_RING: | |
75b28aff HV |
9227 | case IORING_OFF_CQ_RING: |
9228 | ptr = ctx->rings; | |
2b188cc1 JA |
9229 | break; |
9230 | case IORING_OFF_SQES: | |
9231 | ptr = ctx->sq_sqes; | |
9232 | break; | |
2b188cc1 | 9233 | default: |
6c5c240e | 9234 | return ERR_PTR(-EINVAL); |
2b188cc1 JA |
9235 | } |
9236 | ||
9237 | page = virt_to_head_page(ptr); | |
a50b854e | 9238 | if (sz > page_size(page)) |
6c5c240e RP |
9239 | return ERR_PTR(-EINVAL); |
9240 | ||
9241 | return ptr; | |
9242 | } | |
9243 | ||
9244 | #ifdef CONFIG_MMU | |
9245 | ||
9246 | static int io_uring_mmap(struct file *file, struct vm_area_struct *vma) | |
9247 | { | |
9248 | size_t sz = vma->vm_end - vma->vm_start; | |
9249 | unsigned long pfn; | |
9250 | void *ptr; | |
9251 | ||
9252 | ptr = io_uring_validate_mmap_request(file, vma->vm_pgoff, sz); | |
9253 | if (IS_ERR(ptr)) | |
9254 | return PTR_ERR(ptr); | |
2b188cc1 JA |
9255 | |
9256 | pfn = virt_to_phys(ptr) >> PAGE_SHIFT; | |
9257 | return remap_pfn_range(vma, vma->vm_start, pfn, sz, vma->vm_page_prot); | |
9258 | } | |
9259 | ||
6c5c240e RP |
9260 | #else /* !CONFIG_MMU */ |
9261 | ||
9262 | static int io_uring_mmap(struct file *file, struct vm_area_struct *vma) | |
9263 | { | |
9264 | return vma->vm_flags & (VM_SHARED | VM_MAYSHARE) ? 0 : -EINVAL; | |
9265 | } | |
9266 | ||
9267 | static unsigned int io_uring_nommu_mmap_capabilities(struct file *file) | |
9268 | { | |
9269 | return NOMMU_MAP_DIRECT | NOMMU_MAP_READ | NOMMU_MAP_WRITE; | |
9270 | } | |
9271 | ||
9272 | static unsigned long io_uring_nommu_get_unmapped_area(struct file *file, | |
9273 | unsigned long addr, unsigned long len, | |
9274 | unsigned long pgoff, unsigned long flags) | |
9275 | { | |
9276 | void *ptr; | |
9277 | ||
9278 | ptr = io_uring_validate_mmap_request(file, pgoff, len); | |
9279 | if (IS_ERR(ptr)) | |
9280 | return PTR_ERR(ptr); | |
9281 | ||
9282 | return (unsigned long) ptr; | |
9283 | } | |
9284 | ||
9285 | #endif /* !CONFIG_MMU */ | |
9286 | ||
d9d05217 | 9287 | static int io_sqpoll_wait_sq(struct io_ring_ctx *ctx) |
90554200 JA |
9288 | { |
9289 | DEFINE_WAIT(wait); | |
9290 | ||
9291 | do { | |
9292 | if (!io_sqring_full(ctx)) | |
9293 | break; | |
90554200 JA |
9294 | prepare_to_wait(&ctx->sqo_sq_wait, &wait, TASK_INTERRUPTIBLE); |
9295 | ||
9296 | if (!io_sqring_full(ctx)) | |
9297 | break; | |
90554200 JA |
9298 | schedule(); |
9299 | } while (!signal_pending(current)); | |
9300 | ||
9301 | finish_wait(&ctx->sqo_sq_wait, &wait); | |
5199328a | 9302 | return 0; |
90554200 JA |
9303 | } |
9304 | ||
c73ebb68 HX |
9305 | static int io_get_ext_arg(unsigned flags, const void __user *argp, size_t *argsz, |
9306 | struct __kernel_timespec __user **ts, | |
9307 | const sigset_t __user **sig) | |
9308 | { | |
9309 | struct io_uring_getevents_arg arg; | |
9310 | ||
9311 | /* | |
9312 | * If EXT_ARG isn't set, then we have no timespec and the argp pointer | |
9313 | * is just a pointer to the sigset_t. | |
9314 | */ | |
9315 | if (!(flags & IORING_ENTER_EXT_ARG)) { | |
9316 | *sig = (const sigset_t __user *) argp; | |
9317 | *ts = NULL; | |
9318 | return 0; | |
9319 | } | |
9320 | ||
9321 | /* | |
9322 | * EXT_ARG is set - ensure we agree on the size of it and copy in our | |
9323 | * timespec and sigset_t pointers if good. | |
9324 | */ | |
9325 | if (*argsz != sizeof(arg)) | |
9326 | return -EINVAL; | |
9327 | if (copy_from_user(&arg, argp, sizeof(arg))) | |
9328 | return -EFAULT; | |
9329 | *sig = u64_to_user_ptr(arg.sigmask); | |
9330 | *argsz = arg.sigmask_sz; | |
9331 | *ts = u64_to_user_ptr(arg.ts); | |
9332 | return 0; | |
9333 | } | |
9334 | ||
2b188cc1 | 9335 | SYSCALL_DEFINE6(io_uring_enter, unsigned int, fd, u32, to_submit, |
c73ebb68 HX |
9336 | u32, min_complete, u32, flags, const void __user *, argp, |
9337 | size_t, argsz) | |
2b188cc1 JA |
9338 | { |
9339 | struct io_ring_ctx *ctx; | |
2b188cc1 JA |
9340 | int submitted = 0; |
9341 | struct fd f; | |
33f993da | 9342 | long ret; |
2b188cc1 | 9343 | |
4c6e277c | 9344 | io_run_task_work(); |
b41e9852 | 9345 | |
33f993da PB |
9346 | if (unlikely(flags & ~(IORING_ENTER_GETEVENTS | IORING_ENTER_SQ_WAKEUP | |
9347 | IORING_ENTER_SQ_WAIT | IORING_ENTER_EXT_ARG))) | |
2b188cc1 JA |
9348 | return -EINVAL; |
9349 | ||
9350 | f = fdget(fd); | |
33f993da | 9351 | if (unlikely(!f.file)) |
2b188cc1 JA |
9352 | return -EBADF; |
9353 | ||
9354 | ret = -EOPNOTSUPP; | |
33f993da | 9355 | if (unlikely(f.file->f_op != &io_uring_fops)) |
2b188cc1 JA |
9356 | goto out_fput; |
9357 | ||
9358 | ret = -ENXIO; | |
9359 | ctx = f.file->private_data; | |
33f993da | 9360 | if (unlikely(!percpu_ref_tryget(&ctx->refs))) |
2b188cc1 JA |
9361 | goto out_fput; |
9362 | ||
7e84e1c7 | 9363 | ret = -EBADFD; |
33f993da | 9364 | if (unlikely(ctx->flags & IORING_SETUP_R_DISABLED)) |
7e84e1c7 SG |
9365 | goto out; |
9366 | ||
6c271ce2 JA |
9367 | /* |
9368 | * For SQ polling, the thread will do all submissions and completions. | |
9369 | * Just return the requested submit count, and wake the thread if | |
9370 | * we were asked to. | |
9371 | */ | |
b2a9eada | 9372 | ret = 0; |
6c271ce2 | 9373 | if (ctx->flags & IORING_SETUP_SQPOLL) { |
6c2450ae | 9374 | io_cqring_overflow_flush(ctx, false); |
89448c47 | 9375 | |
21f96522 JA |
9376 | if (unlikely(ctx->sq_data->thread == NULL)) { |
9377 | ret = -EOWNERDEAD; | |
04147488 | 9378 | goto out; |
21f96522 | 9379 | } |
6c271ce2 | 9380 | if (flags & IORING_ENTER_SQ_WAKEUP) |
534ca6d6 | 9381 | wake_up(&ctx->sq_data->wait); |
d9d05217 PB |
9382 | if (flags & IORING_ENTER_SQ_WAIT) { |
9383 | ret = io_sqpoll_wait_sq(ctx); | |
9384 | if (ret) | |
9385 | goto out; | |
9386 | } | |
6c271ce2 | 9387 | submitted = to_submit; |
b2a9eada | 9388 | } else if (to_submit) { |
eef51daa | 9389 | ret = io_uring_add_tctx_node(ctx); |
0f212204 JA |
9390 | if (unlikely(ret)) |
9391 | goto out; | |
2b188cc1 | 9392 | mutex_lock(&ctx->uring_lock); |
0f212204 | 9393 | submitted = io_submit_sqes(ctx, to_submit); |
2b188cc1 | 9394 | mutex_unlock(&ctx->uring_lock); |
7c504e65 PB |
9395 | |
9396 | if (submitted != to_submit) | |
9397 | goto out; | |
2b188cc1 JA |
9398 | } |
9399 | if (flags & IORING_ENTER_GETEVENTS) { | |
c73ebb68 HX |
9400 | const sigset_t __user *sig; |
9401 | struct __kernel_timespec __user *ts; | |
9402 | ||
9403 | ret = io_get_ext_arg(flags, argp, &argsz, &ts, &sig); | |
9404 | if (unlikely(ret)) | |
9405 | goto out; | |
9406 | ||
2b188cc1 JA |
9407 | min_complete = min(min_complete, ctx->cq_entries); |
9408 | ||
32b2244a XW |
9409 | /* |
9410 | * When SETUP_IOPOLL and SETUP_SQPOLL are both enabled, user | |
9411 | * space applications don't need to do io completion events | |
9412 | * polling again, they can rely on io_sq_thread to do polling | |
9413 | * work, which can reduce cpu usage and uring_lock contention. | |
9414 | */ | |
9415 | if (ctx->flags & IORING_SETUP_IOPOLL && | |
9416 | !(ctx->flags & IORING_SETUP_SQPOLL)) { | |
7668b92a | 9417 | ret = io_iopoll_check(ctx, min_complete); |
def596e9 | 9418 | } else { |
c73ebb68 | 9419 | ret = io_cqring_wait(ctx, min_complete, sig, argsz, ts); |
def596e9 | 9420 | } |
2b188cc1 JA |
9421 | } |
9422 | ||
7c504e65 | 9423 | out: |
6805b32e | 9424 | percpu_ref_put(&ctx->refs); |
2b188cc1 JA |
9425 | out_fput: |
9426 | fdput(f); | |
9427 | return submitted ? submitted : ret; | |
9428 | } | |
9429 | ||
bebdb65e | 9430 | #ifdef CONFIG_PROC_FS |
61cf9370 MWO |
9431 | static int io_uring_show_cred(struct seq_file *m, unsigned int id, |
9432 | const struct cred *cred) | |
87ce955b | 9433 | { |
87ce955b JA |
9434 | struct user_namespace *uns = seq_user_ns(m); |
9435 | struct group_info *gi; | |
9436 | kernel_cap_t cap; | |
9437 | unsigned __capi; | |
9438 | int g; | |
9439 | ||
9440 | seq_printf(m, "%5d\n", id); | |
9441 | seq_put_decimal_ull(m, "\tUid:\t", from_kuid_munged(uns, cred->uid)); | |
9442 | seq_put_decimal_ull(m, "\t\t", from_kuid_munged(uns, cred->euid)); | |
9443 | seq_put_decimal_ull(m, "\t\t", from_kuid_munged(uns, cred->suid)); | |
9444 | seq_put_decimal_ull(m, "\t\t", from_kuid_munged(uns, cred->fsuid)); | |
9445 | seq_put_decimal_ull(m, "\n\tGid:\t", from_kgid_munged(uns, cred->gid)); | |
9446 | seq_put_decimal_ull(m, "\t\t", from_kgid_munged(uns, cred->egid)); | |
9447 | seq_put_decimal_ull(m, "\t\t", from_kgid_munged(uns, cred->sgid)); | |
9448 | seq_put_decimal_ull(m, "\t\t", from_kgid_munged(uns, cred->fsgid)); | |
9449 | seq_puts(m, "\n\tGroups:\t"); | |
9450 | gi = cred->group_info; | |
9451 | for (g = 0; g < gi->ngroups; g++) { | |
9452 | seq_put_decimal_ull(m, g ? " " : "", | |
9453 | from_kgid_munged(uns, gi->gid[g])); | |
9454 | } | |
9455 | seq_puts(m, "\n\tCapEff:\t"); | |
9456 | cap = cred->cap_effective; | |
9457 | CAP_FOR_EACH_U32(__capi) | |
9458 | seq_put_hex_ll(m, NULL, cap.cap[CAP_LAST_U32 - __capi], 8); | |
9459 | seq_putc(m, '\n'); | |
9460 | return 0; | |
9461 | } | |
9462 | ||
9463 | static void __io_uring_show_fdinfo(struct io_ring_ctx *ctx, struct seq_file *m) | |
9464 | { | |
dbbe9c64 | 9465 | struct io_sq_data *sq = NULL; |
fad8e0de | 9466 | bool has_lock; |
87ce955b JA |
9467 | int i; |
9468 | ||
fad8e0de JA |
9469 | /* |
9470 | * Avoid ABBA deadlock between the seq lock and the io_uring mutex, | |
9471 | * since fdinfo case grabs it in the opposite direction of normal use | |
9472 | * cases. If we fail to get the lock, we just don't iterate any | |
9473 | * structures that could be going away outside the io_uring mutex. | |
9474 | */ | |
9475 | has_lock = mutex_trylock(&ctx->uring_lock); | |
9476 | ||
5f3f26f9 | 9477 | if (has_lock && (ctx->flags & IORING_SETUP_SQPOLL)) { |
dbbe9c64 | 9478 | sq = ctx->sq_data; |
5f3f26f9 JA |
9479 | if (!sq->thread) |
9480 | sq = NULL; | |
9481 | } | |
dbbe9c64 JQ |
9482 | |
9483 | seq_printf(m, "SqThread:\t%d\n", sq ? task_pid_nr(sq->thread) : -1); | |
9484 | seq_printf(m, "SqThreadCpu:\t%d\n", sq ? task_cpu(sq->thread) : -1); | |
87ce955b | 9485 | seq_printf(m, "UserFiles:\t%u\n", ctx->nr_user_files); |
fad8e0de | 9486 | for (i = 0; has_lock && i < ctx->nr_user_files; i++) { |
7b29f92d | 9487 | struct file *f = io_file_from_index(ctx, i); |
87ce955b | 9488 | |
87ce955b JA |
9489 | if (f) |
9490 | seq_printf(m, "%5u: %s\n", i, file_dentry(f)->d_iname); | |
9491 | else | |
9492 | seq_printf(m, "%5u: <none>\n", i); | |
9493 | } | |
9494 | seq_printf(m, "UserBufs:\t%u\n", ctx->nr_user_bufs); | |
fad8e0de | 9495 | for (i = 0; has_lock && i < ctx->nr_user_bufs; i++) { |
41edf1a5 | 9496 | struct io_mapped_ubuf *buf = ctx->user_bufs[i]; |
4751f53d | 9497 | unsigned int len = buf->ubuf_end - buf->ubuf; |
87ce955b | 9498 | |
4751f53d | 9499 | seq_printf(m, "%5u: 0x%llx/%u\n", i, buf->ubuf, len); |
87ce955b | 9500 | } |
61cf9370 MWO |
9501 | if (has_lock && !xa_empty(&ctx->personalities)) { |
9502 | unsigned long index; | |
9503 | const struct cred *cred; | |
9504 | ||
87ce955b | 9505 | seq_printf(m, "Personalities:\n"); |
61cf9370 MWO |
9506 | xa_for_each(&ctx->personalities, index, cred) |
9507 | io_uring_show_cred(m, index, cred); | |
87ce955b | 9508 | } |
d7718a9d JA |
9509 | seq_printf(m, "PollList:\n"); |
9510 | spin_lock_irq(&ctx->completion_lock); | |
9511 | for (i = 0; i < (1U << ctx->cancel_hash_bits); i++) { | |
9512 | struct hlist_head *list = &ctx->cancel_hash[i]; | |
9513 | struct io_kiocb *req; | |
9514 | ||
9515 | hlist_for_each_entry(req, list, hash_node) | |
9516 | seq_printf(m, " op=%d, task_works=%d\n", req->opcode, | |
9517 | req->task->task_works != NULL); | |
9518 | } | |
9519 | spin_unlock_irq(&ctx->completion_lock); | |
fad8e0de JA |
9520 | if (has_lock) |
9521 | mutex_unlock(&ctx->uring_lock); | |
87ce955b JA |
9522 | } |
9523 | ||
9524 | static void io_uring_show_fdinfo(struct seq_file *m, struct file *f) | |
9525 | { | |
9526 | struct io_ring_ctx *ctx = f->private_data; | |
9527 | ||
9528 | if (percpu_ref_tryget(&ctx->refs)) { | |
9529 | __io_uring_show_fdinfo(ctx, m); | |
9530 | percpu_ref_put(&ctx->refs); | |
9531 | } | |
9532 | } | |
bebdb65e | 9533 | #endif |
87ce955b | 9534 | |
2b188cc1 JA |
9535 | static const struct file_operations io_uring_fops = { |
9536 | .release = io_uring_release, | |
9537 | .mmap = io_uring_mmap, | |
6c5c240e RP |
9538 | #ifndef CONFIG_MMU |
9539 | .get_unmapped_area = io_uring_nommu_get_unmapped_area, | |
9540 | .mmap_capabilities = io_uring_nommu_mmap_capabilities, | |
9541 | #endif | |
2b188cc1 JA |
9542 | .poll = io_uring_poll, |
9543 | .fasync = io_uring_fasync, | |
bebdb65e | 9544 | #ifdef CONFIG_PROC_FS |
87ce955b | 9545 | .show_fdinfo = io_uring_show_fdinfo, |
bebdb65e | 9546 | #endif |
2b188cc1 JA |
9547 | }; |
9548 | ||
9549 | static int io_allocate_scq_urings(struct io_ring_ctx *ctx, | |
9550 | struct io_uring_params *p) | |
9551 | { | |
75b28aff HV |
9552 | struct io_rings *rings; |
9553 | size_t size, sq_array_offset; | |
2b188cc1 | 9554 | |
bd740481 JA |
9555 | /* make sure these are sane, as we already accounted them */ |
9556 | ctx->sq_entries = p->sq_entries; | |
9557 | ctx->cq_entries = p->cq_entries; | |
9558 | ||
75b28aff HV |
9559 | size = rings_size(p->sq_entries, p->cq_entries, &sq_array_offset); |
9560 | if (size == SIZE_MAX) | |
9561 | return -EOVERFLOW; | |
9562 | ||
9563 | rings = io_mem_alloc(size); | |
9564 | if (!rings) | |
2b188cc1 JA |
9565 | return -ENOMEM; |
9566 | ||
75b28aff HV |
9567 | ctx->rings = rings; |
9568 | ctx->sq_array = (u32 *)((char *)rings + sq_array_offset); | |
9569 | rings->sq_ring_mask = p->sq_entries - 1; | |
9570 | rings->cq_ring_mask = p->cq_entries - 1; | |
9571 | rings->sq_ring_entries = p->sq_entries; | |
9572 | rings->cq_ring_entries = p->cq_entries; | |
2b188cc1 JA |
9573 | |
9574 | size = array_size(sizeof(struct io_uring_sqe), p->sq_entries); | |
eb065d30 JA |
9575 | if (size == SIZE_MAX) { |
9576 | io_mem_free(ctx->rings); | |
9577 | ctx->rings = NULL; | |
2b188cc1 | 9578 | return -EOVERFLOW; |
eb065d30 | 9579 | } |
2b188cc1 JA |
9580 | |
9581 | ctx->sq_sqes = io_mem_alloc(size); | |
eb065d30 JA |
9582 | if (!ctx->sq_sqes) { |
9583 | io_mem_free(ctx->rings); | |
9584 | ctx->rings = NULL; | |
2b188cc1 | 9585 | return -ENOMEM; |
eb065d30 | 9586 | } |
2b188cc1 | 9587 | |
2b188cc1 JA |
9588 | return 0; |
9589 | } | |
9590 | ||
9faadcc8 PB |
9591 | static int io_uring_install_fd(struct io_ring_ctx *ctx, struct file *file) |
9592 | { | |
9593 | int ret, fd; | |
9594 | ||
9595 | fd = get_unused_fd_flags(O_RDWR | O_CLOEXEC); | |
9596 | if (fd < 0) | |
9597 | return fd; | |
9598 | ||
eef51daa | 9599 | ret = io_uring_add_tctx_node(ctx); |
9faadcc8 PB |
9600 | if (ret) { |
9601 | put_unused_fd(fd); | |
9602 | return ret; | |
9603 | } | |
9604 | fd_install(fd, file); | |
9605 | return fd; | |
9606 | } | |
9607 | ||
2b188cc1 JA |
9608 | /* |
9609 | * Allocate an anonymous fd, this is what constitutes the application | |
9610 | * visible backing of an io_uring instance. The application mmaps this | |
9611 | * fd to gain access to the SQ/CQ ring details. If UNIX sockets are enabled, | |
9612 | * we have to tie this fd to a socket for file garbage collection purposes. | |
9613 | */ | |
9faadcc8 | 9614 | static struct file *io_uring_get_file(struct io_ring_ctx *ctx) |
2b188cc1 JA |
9615 | { |
9616 | struct file *file; | |
9faadcc8 | 9617 | #if defined(CONFIG_UNIX) |
2b188cc1 JA |
9618 | int ret; |
9619 | ||
2b188cc1 JA |
9620 | ret = sock_create_kern(&init_net, PF_UNIX, SOCK_RAW, IPPROTO_IP, |
9621 | &ctx->ring_sock); | |
9622 | if (ret) | |
9faadcc8 | 9623 | return ERR_PTR(ret); |
2b188cc1 JA |
9624 | #endif |
9625 | ||
2b188cc1 JA |
9626 | file = anon_inode_getfile("[io_uring]", &io_uring_fops, ctx, |
9627 | O_RDWR | O_CLOEXEC); | |
2b188cc1 | 9628 | #if defined(CONFIG_UNIX) |
9faadcc8 PB |
9629 | if (IS_ERR(file)) { |
9630 | sock_release(ctx->ring_sock); | |
9631 | ctx->ring_sock = NULL; | |
9632 | } else { | |
9633 | ctx->ring_sock->file = file; | |
0f212204 | 9634 | } |
2b188cc1 | 9635 | #endif |
9faadcc8 | 9636 | return file; |
2b188cc1 JA |
9637 | } |
9638 | ||
7f13657d XW |
9639 | static int io_uring_create(unsigned entries, struct io_uring_params *p, |
9640 | struct io_uring_params __user *params) | |
2b188cc1 | 9641 | { |
2b188cc1 | 9642 | struct io_ring_ctx *ctx; |
9faadcc8 | 9643 | struct file *file; |
2b188cc1 JA |
9644 | int ret; |
9645 | ||
8110c1a6 | 9646 | if (!entries) |
2b188cc1 | 9647 | return -EINVAL; |
8110c1a6 JA |
9648 | if (entries > IORING_MAX_ENTRIES) { |
9649 | if (!(p->flags & IORING_SETUP_CLAMP)) | |
9650 | return -EINVAL; | |
9651 | entries = IORING_MAX_ENTRIES; | |
9652 | } | |
2b188cc1 JA |
9653 | |
9654 | /* | |
9655 | * Use twice as many entries for the CQ ring. It's possible for the | |
9656 | * application to drive a higher depth than the size of the SQ ring, | |
9657 | * since the sqes are only used at submission time. This allows for | |
33a107f0 JA |
9658 | * some flexibility in overcommitting a bit. If the application has |
9659 | * set IORING_SETUP_CQSIZE, it will have passed in the desired number | |
9660 | * of CQ ring entries manually. | |
2b188cc1 JA |
9661 | */ |
9662 | p->sq_entries = roundup_pow_of_two(entries); | |
33a107f0 JA |
9663 | if (p->flags & IORING_SETUP_CQSIZE) { |
9664 | /* | |
9665 | * If IORING_SETUP_CQSIZE is set, we do the same roundup | |
9666 | * to a power-of-two, if it isn't already. We do NOT impose | |
9667 | * any cq vs sq ring sizing. | |
9668 | */ | |
eb2667b3 | 9669 | if (!p->cq_entries) |
33a107f0 | 9670 | return -EINVAL; |
8110c1a6 JA |
9671 | if (p->cq_entries > IORING_MAX_CQ_ENTRIES) { |
9672 | if (!(p->flags & IORING_SETUP_CLAMP)) | |
9673 | return -EINVAL; | |
9674 | p->cq_entries = IORING_MAX_CQ_ENTRIES; | |
9675 | } | |
eb2667b3 JQ |
9676 | p->cq_entries = roundup_pow_of_two(p->cq_entries); |
9677 | if (p->cq_entries < p->sq_entries) | |
9678 | return -EINVAL; | |
33a107f0 JA |
9679 | } else { |
9680 | p->cq_entries = 2 * p->sq_entries; | |
9681 | } | |
2b188cc1 | 9682 | |
2b188cc1 | 9683 | ctx = io_ring_ctx_alloc(p); |
62e398be | 9684 | if (!ctx) |
2b188cc1 | 9685 | return -ENOMEM; |
2b188cc1 | 9686 | ctx->compat = in_compat_syscall(); |
62e398be JA |
9687 | if (!capable(CAP_IPC_LOCK)) |
9688 | ctx->user = get_uid(current_user()); | |
2aede0e4 JA |
9689 | |
9690 | /* | |
9691 | * This is just grabbed for accounting purposes. When a process exits, | |
9692 | * the mm is exited and dropped before the files, hence we need to hang | |
9693 | * on to this mm purely for the purposes of being able to unaccount | |
9694 | * memory (locked/pinned vm). It's not used for anything else. | |
9695 | */ | |
6b7898eb | 9696 | mmgrab(current->mm); |
2aede0e4 | 9697 | ctx->mm_account = current->mm; |
6b7898eb | 9698 | |
2b188cc1 JA |
9699 | ret = io_allocate_scq_urings(ctx, p); |
9700 | if (ret) | |
9701 | goto err; | |
9702 | ||
7e84e1c7 | 9703 | ret = io_sq_offload_create(ctx, p); |
2b188cc1 JA |
9704 | if (ret) |
9705 | goto err; | |
eae071c9 | 9706 | /* always set a rsrc node */ |
47b228ce PB |
9707 | ret = io_rsrc_node_switch_start(ctx); |
9708 | if (ret) | |
9709 | goto err; | |
eae071c9 | 9710 | io_rsrc_node_switch(ctx, NULL); |
2b188cc1 | 9711 | |
2b188cc1 | 9712 | memset(&p->sq_off, 0, sizeof(p->sq_off)); |
75b28aff HV |
9713 | p->sq_off.head = offsetof(struct io_rings, sq.head); |
9714 | p->sq_off.tail = offsetof(struct io_rings, sq.tail); | |
9715 | p->sq_off.ring_mask = offsetof(struct io_rings, sq_ring_mask); | |
9716 | p->sq_off.ring_entries = offsetof(struct io_rings, sq_ring_entries); | |
9717 | p->sq_off.flags = offsetof(struct io_rings, sq_flags); | |
9718 | p->sq_off.dropped = offsetof(struct io_rings, sq_dropped); | |
9719 | p->sq_off.array = (char *)ctx->sq_array - (char *)ctx->rings; | |
2b188cc1 JA |
9720 | |
9721 | memset(&p->cq_off, 0, sizeof(p->cq_off)); | |
75b28aff HV |
9722 | p->cq_off.head = offsetof(struct io_rings, cq.head); |
9723 | p->cq_off.tail = offsetof(struct io_rings, cq.tail); | |
9724 | p->cq_off.ring_mask = offsetof(struct io_rings, cq_ring_mask); | |
9725 | p->cq_off.ring_entries = offsetof(struct io_rings, cq_ring_entries); | |
9726 | p->cq_off.overflow = offsetof(struct io_rings, cq_overflow); | |
9727 | p->cq_off.cqes = offsetof(struct io_rings, cqes); | |
0d9b5b3a | 9728 | p->cq_off.flags = offsetof(struct io_rings, cq_flags); |
ac90f249 | 9729 | |
7f13657d XW |
9730 | p->features = IORING_FEAT_SINGLE_MMAP | IORING_FEAT_NODROP | |
9731 | IORING_FEAT_SUBMIT_STABLE | IORING_FEAT_RW_CUR_POS | | |
5769a351 | 9732 | IORING_FEAT_CUR_PERSONALITY | IORING_FEAT_FAST_POLL | |
c73ebb68 | 9733 | IORING_FEAT_POLL_32BITS | IORING_FEAT_SQPOLL_NONFIXED | |
9690557e PB |
9734 | IORING_FEAT_EXT_ARG | IORING_FEAT_NATIVE_WORKERS | |
9735 | IORING_FEAT_RSRC_TAGS; | |
7f13657d XW |
9736 | |
9737 | if (copy_to_user(params, p, sizeof(*p))) { | |
9738 | ret = -EFAULT; | |
9739 | goto err; | |
9740 | } | |
d1719f70 | 9741 | |
9faadcc8 PB |
9742 | file = io_uring_get_file(ctx); |
9743 | if (IS_ERR(file)) { | |
9744 | ret = PTR_ERR(file); | |
9745 | goto err; | |
9746 | } | |
9747 | ||
044c1ab3 JA |
9748 | /* |
9749 | * Install ring fd as the very last thing, so we don't risk someone | |
9750 | * having closed it before we finish setup | |
9751 | */ | |
9faadcc8 PB |
9752 | ret = io_uring_install_fd(ctx, file); |
9753 | if (ret < 0) { | |
9754 | /* fput will clean it up */ | |
9755 | fput(file); | |
9756 | return ret; | |
9757 | } | |
044c1ab3 | 9758 | |
c826bd7a | 9759 | trace_io_uring_create(ret, ctx, p->sq_entries, p->cq_entries, p->flags); |
2b188cc1 JA |
9760 | return ret; |
9761 | err: | |
9762 | io_ring_ctx_wait_and_kill(ctx); | |
9763 | return ret; | |
9764 | } | |
9765 | ||
9766 | /* | |
9767 | * Sets up an aio uring context, and returns the fd. Applications asks for a | |
9768 | * ring size, we return the actual sq/cq ring sizes (among other things) in the | |
9769 | * params structure passed in. | |
9770 | */ | |
9771 | static long io_uring_setup(u32 entries, struct io_uring_params __user *params) | |
9772 | { | |
9773 | struct io_uring_params p; | |
2b188cc1 JA |
9774 | int i; |
9775 | ||
9776 | if (copy_from_user(&p, params, sizeof(p))) | |
9777 | return -EFAULT; | |
9778 | for (i = 0; i < ARRAY_SIZE(p.resv); i++) { | |
9779 | if (p.resv[i]) | |
9780 | return -EINVAL; | |
9781 | } | |
9782 | ||
6c271ce2 | 9783 | if (p.flags & ~(IORING_SETUP_IOPOLL | IORING_SETUP_SQPOLL | |
8110c1a6 | 9784 | IORING_SETUP_SQ_AFF | IORING_SETUP_CQSIZE | |
7e84e1c7 SG |
9785 | IORING_SETUP_CLAMP | IORING_SETUP_ATTACH_WQ | |
9786 | IORING_SETUP_R_DISABLED)) | |
2b188cc1 JA |
9787 | return -EINVAL; |
9788 | ||
7f13657d | 9789 | return io_uring_create(entries, &p, params); |
2b188cc1 JA |
9790 | } |
9791 | ||
9792 | SYSCALL_DEFINE2(io_uring_setup, u32, entries, | |
9793 | struct io_uring_params __user *, params) | |
9794 | { | |
9795 | return io_uring_setup(entries, params); | |
9796 | } | |
9797 | ||
66f4af93 JA |
9798 | static int io_probe(struct io_ring_ctx *ctx, void __user *arg, unsigned nr_args) |
9799 | { | |
9800 | struct io_uring_probe *p; | |
9801 | size_t size; | |
9802 | int i, ret; | |
9803 | ||
9804 | size = struct_size(p, ops, nr_args); | |
9805 | if (size == SIZE_MAX) | |
9806 | return -EOVERFLOW; | |
9807 | p = kzalloc(size, GFP_KERNEL); | |
9808 | if (!p) | |
9809 | return -ENOMEM; | |
9810 | ||
9811 | ret = -EFAULT; | |
9812 | if (copy_from_user(p, arg, size)) | |
9813 | goto out; | |
9814 | ret = -EINVAL; | |
9815 | if (memchr_inv(p, 0, size)) | |
9816 | goto out; | |
9817 | ||
9818 | p->last_op = IORING_OP_LAST - 1; | |
9819 | if (nr_args > IORING_OP_LAST) | |
9820 | nr_args = IORING_OP_LAST; | |
9821 | ||
9822 | for (i = 0; i < nr_args; i++) { | |
9823 | p->ops[i].op = i; | |
9824 | if (!io_op_defs[i].not_supported) | |
9825 | p->ops[i].flags = IO_URING_OP_SUPPORTED; | |
9826 | } | |
9827 | p->ops_len = i; | |
9828 | ||
9829 | ret = 0; | |
9830 | if (copy_to_user(arg, p, size)) | |
9831 | ret = -EFAULT; | |
9832 | out: | |
9833 | kfree(p); | |
9834 | return ret; | |
9835 | } | |
9836 | ||
071698e1 JA |
9837 | static int io_register_personality(struct io_ring_ctx *ctx) |
9838 | { | |
4379bf8b | 9839 | const struct cred *creds; |
61cf9370 | 9840 | u32 id; |
1e6fa521 | 9841 | int ret; |
071698e1 | 9842 | |
4379bf8b | 9843 | creds = get_current_cred(); |
1e6fa521 | 9844 | |
61cf9370 MWO |
9845 | ret = xa_alloc_cyclic(&ctx->personalities, &id, (void *)creds, |
9846 | XA_LIMIT(0, USHRT_MAX), &ctx->pers_next, GFP_KERNEL); | |
a30f895a JA |
9847 | if (ret < 0) { |
9848 | put_cred(creds); | |
9849 | return ret; | |
9850 | } | |
9851 | return id; | |
071698e1 JA |
9852 | } |
9853 | ||
21b55dbc SG |
9854 | static int io_register_restrictions(struct io_ring_ctx *ctx, void __user *arg, |
9855 | unsigned int nr_args) | |
9856 | { | |
9857 | struct io_uring_restriction *res; | |
9858 | size_t size; | |
9859 | int i, ret; | |
9860 | ||
7e84e1c7 SG |
9861 | /* Restrictions allowed only if rings started disabled */ |
9862 | if (!(ctx->flags & IORING_SETUP_R_DISABLED)) | |
9863 | return -EBADFD; | |
9864 | ||
21b55dbc | 9865 | /* We allow only a single restrictions registration */ |
7e84e1c7 | 9866 | if (ctx->restrictions.registered) |
21b55dbc SG |
9867 | return -EBUSY; |
9868 | ||
9869 | if (!arg || nr_args > IORING_MAX_RESTRICTIONS) | |
9870 | return -EINVAL; | |
9871 | ||
9872 | size = array_size(nr_args, sizeof(*res)); | |
9873 | if (size == SIZE_MAX) | |
9874 | return -EOVERFLOW; | |
9875 | ||
9876 | res = memdup_user(arg, size); | |
9877 | if (IS_ERR(res)) | |
9878 | return PTR_ERR(res); | |
9879 | ||
9880 | ret = 0; | |
9881 | ||
9882 | for (i = 0; i < nr_args; i++) { | |
9883 | switch (res[i].opcode) { | |
9884 | case IORING_RESTRICTION_REGISTER_OP: | |
9885 | if (res[i].register_op >= IORING_REGISTER_LAST) { | |
9886 | ret = -EINVAL; | |
9887 | goto out; | |
9888 | } | |
9889 | ||
9890 | __set_bit(res[i].register_op, | |
9891 | ctx->restrictions.register_op); | |
9892 | break; | |
9893 | case IORING_RESTRICTION_SQE_OP: | |
9894 | if (res[i].sqe_op >= IORING_OP_LAST) { | |
9895 | ret = -EINVAL; | |
9896 | goto out; | |
9897 | } | |
9898 | ||
9899 | __set_bit(res[i].sqe_op, ctx->restrictions.sqe_op); | |
9900 | break; | |
9901 | case IORING_RESTRICTION_SQE_FLAGS_ALLOWED: | |
9902 | ctx->restrictions.sqe_flags_allowed = res[i].sqe_flags; | |
9903 | break; | |
9904 | case IORING_RESTRICTION_SQE_FLAGS_REQUIRED: | |
9905 | ctx->restrictions.sqe_flags_required = res[i].sqe_flags; | |
9906 | break; | |
9907 | default: | |
9908 | ret = -EINVAL; | |
9909 | goto out; | |
9910 | } | |
9911 | } | |
9912 | ||
9913 | out: | |
9914 | /* Reset all restrictions if an error happened */ | |
9915 | if (ret != 0) | |
9916 | memset(&ctx->restrictions, 0, sizeof(ctx->restrictions)); | |
9917 | else | |
7e84e1c7 | 9918 | ctx->restrictions.registered = true; |
21b55dbc SG |
9919 | |
9920 | kfree(res); | |
9921 | return ret; | |
9922 | } | |
9923 | ||
7e84e1c7 SG |
9924 | static int io_register_enable_rings(struct io_ring_ctx *ctx) |
9925 | { | |
9926 | if (!(ctx->flags & IORING_SETUP_R_DISABLED)) | |
9927 | return -EBADFD; | |
9928 | ||
9929 | if (ctx->restrictions.registered) | |
9930 | ctx->restricted = 1; | |
9931 | ||
0298ef96 PB |
9932 | ctx->flags &= ~IORING_SETUP_R_DISABLED; |
9933 | if (ctx->sq_data && wq_has_sleeper(&ctx->sq_data->wait)) | |
9934 | wake_up(&ctx->sq_data->wait); | |
7e84e1c7 SG |
9935 | return 0; |
9936 | } | |
9937 | ||
fdecb662 | 9938 | static int __io_register_rsrc_update(struct io_ring_ctx *ctx, unsigned type, |
c3bdad02 | 9939 | struct io_uring_rsrc_update2 *up, |
98f0b3b4 PB |
9940 | unsigned nr_args) |
9941 | { | |
9942 | __u32 tmp; | |
9943 | int err; | |
9944 | ||
c3bdad02 PB |
9945 | if (up->resv) |
9946 | return -EINVAL; | |
98f0b3b4 PB |
9947 | if (check_add_overflow(up->offset, nr_args, &tmp)) |
9948 | return -EOVERFLOW; | |
9949 | err = io_rsrc_node_switch_start(ctx); | |
9950 | if (err) | |
9951 | return err; | |
9952 | ||
fdecb662 PB |
9953 | switch (type) { |
9954 | case IORING_RSRC_FILE: | |
98f0b3b4 | 9955 | return __io_sqe_files_update(ctx, up, nr_args); |
634d00df PB |
9956 | case IORING_RSRC_BUFFER: |
9957 | return __io_sqe_buffers_update(ctx, up, nr_args); | |
98f0b3b4 PB |
9958 | } |
9959 | return -EINVAL; | |
9960 | } | |
9961 | ||
c3bdad02 PB |
9962 | static int io_register_files_update(struct io_ring_ctx *ctx, void __user *arg, |
9963 | unsigned nr_args) | |
98f0b3b4 | 9964 | { |
c3bdad02 | 9965 | struct io_uring_rsrc_update2 up; |
98f0b3b4 PB |
9966 | |
9967 | if (!nr_args) | |
9968 | return -EINVAL; | |
c3bdad02 PB |
9969 | memset(&up, 0, sizeof(up)); |
9970 | if (copy_from_user(&up, arg, sizeof(struct io_uring_rsrc_update))) | |
9971 | return -EFAULT; | |
9972 | return __io_register_rsrc_update(ctx, IORING_RSRC_FILE, &up, nr_args); | |
9973 | } | |
9974 | ||
9975 | static int io_register_rsrc_update(struct io_ring_ctx *ctx, void __user *arg, | |
992da01a | 9976 | unsigned size, unsigned type) |
c3bdad02 PB |
9977 | { |
9978 | struct io_uring_rsrc_update2 up; | |
9979 | ||
9980 | if (size != sizeof(up)) | |
9981 | return -EINVAL; | |
98f0b3b4 PB |
9982 | if (copy_from_user(&up, arg, sizeof(up))) |
9983 | return -EFAULT; | |
992da01a | 9984 | if (!up.nr || up.resv) |
98f0b3b4 | 9985 | return -EINVAL; |
992da01a | 9986 | return __io_register_rsrc_update(ctx, type, &up, up.nr); |
98f0b3b4 PB |
9987 | } |
9988 | ||
792e3582 | 9989 | static int io_register_rsrc(struct io_ring_ctx *ctx, void __user *arg, |
992da01a | 9990 | unsigned int size, unsigned int type) |
792e3582 PB |
9991 | { |
9992 | struct io_uring_rsrc_register rr; | |
9993 | ||
9994 | /* keep it extendible */ | |
9995 | if (size != sizeof(rr)) | |
9996 | return -EINVAL; | |
9997 | ||
9998 | memset(&rr, 0, sizeof(rr)); | |
9999 | if (copy_from_user(&rr, arg, size)) | |
10000 | return -EFAULT; | |
992da01a | 10001 | if (!rr.nr || rr.resv || rr.resv2) |
792e3582 PB |
10002 | return -EINVAL; |
10003 | ||
992da01a | 10004 | switch (type) { |
792e3582 PB |
10005 | case IORING_RSRC_FILE: |
10006 | return io_sqe_files_register(ctx, u64_to_user_ptr(rr.data), | |
10007 | rr.nr, u64_to_user_ptr(rr.tags)); | |
634d00df PB |
10008 | case IORING_RSRC_BUFFER: |
10009 | return io_sqe_buffers_register(ctx, u64_to_user_ptr(rr.data), | |
10010 | rr.nr, u64_to_user_ptr(rr.tags)); | |
792e3582 PB |
10011 | } |
10012 | return -EINVAL; | |
10013 | } | |
10014 | ||
fe76421d JA |
10015 | static int io_register_iowq_aff(struct io_ring_ctx *ctx, void __user *arg, |
10016 | unsigned len) | |
10017 | { | |
10018 | struct io_uring_task *tctx = current->io_uring; | |
10019 | cpumask_var_t new_mask; | |
10020 | int ret; | |
10021 | ||
10022 | if (!tctx || !tctx->io_wq) | |
10023 | return -EINVAL; | |
10024 | ||
10025 | if (!alloc_cpumask_var(&new_mask, GFP_KERNEL)) | |
10026 | return -ENOMEM; | |
10027 | ||
10028 | cpumask_clear(new_mask); | |
10029 | if (len > cpumask_size()) | |
10030 | len = cpumask_size(); | |
10031 | ||
10032 | if (copy_from_user(new_mask, arg, len)) { | |
10033 | free_cpumask_var(new_mask); | |
10034 | return -EFAULT; | |
10035 | } | |
10036 | ||
10037 | ret = io_wq_cpu_affinity(tctx->io_wq, new_mask); | |
10038 | free_cpumask_var(new_mask); | |
10039 | return ret; | |
10040 | } | |
10041 | ||
10042 | static int io_unregister_iowq_aff(struct io_ring_ctx *ctx) | |
10043 | { | |
10044 | struct io_uring_task *tctx = current->io_uring; | |
10045 | ||
10046 | if (!tctx || !tctx->io_wq) | |
10047 | return -EINVAL; | |
10048 | ||
10049 | return io_wq_cpu_affinity(tctx->io_wq, NULL); | |
10050 | } | |
10051 | ||
071698e1 JA |
10052 | static bool io_register_op_must_quiesce(int op) |
10053 | { | |
10054 | switch (op) { | |
bd54b6fe BM |
10055 | case IORING_REGISTER_BUFFERS: |
10056 | case IORING_UNREGISTER_BUFFERS: | |
f4f7d21c | 10057 | case IORING_REGISTER_FILES: |
071698e1 JA |
10058 | case IORING_UNREGISTER_FILES: |
10059 | case IORING_REGISTER_FILES_UPDATE: | |
10060 | case IORING_REGISTER_PROBE: | |
10061 | case IORING_REGISTER_PERSONALITY: | |
10062 | case IORING_UNREGISTER_PERSONALITY: | |
992da01a PB |
10063 | case IORING_REGISTER_FILES2: |
10064 | case IORING_REGISTER_FILES_UPDATE2: | |
10065 | case IORING_REGISTER_BUFFERS2: | |
10066 | case IORING_REGISTER_BUFFERS_UPDATE: | |
fe76421d JA |
10067 | case IORING_REGISTER_IOWQ_AFF: |
10068 | case IORING_UNREGISTER_IOWQ_AFF: | |
071698e1 JA |
10069 | return false; |
10070 | default: | |
10071 | return true; | |
10072 | } | |
10073 | } | |
10074 | ||
e73c5c7c PB |
10075 | static int io_ctx_quiesce(struct io_ring_ctx *ctx) |
10076 | { | |
10077 | long ret; | |
10078 | ||
10079 | percpu_ref_kill(&ctx->refs); | |
10080 | ||
10081 | /* | |
10082 | * Drop uring mutex before waiting for references to exit. If another | |
10083 | * thread is currently inside io_uring_enter() it might need to grab the | |
10084 | * uring_lock to make progress. If we hold it here across the drain | |
10085 | * wait, then we can deadlock. It's safe to drop the mutex here, since | |
10086 | * no new references will come in after we've killed the percpu ref. | |
10087 | */ | |
10088 | mutex_unlock(&ctx->uring_lock); | |
10089 | do { | |
10090 | ret = wait_for_completion_interruptible(&ctx->ref_comp); | |
10091 | if (!ret) | |
10092 | break; | |
10093 | ret = io_run_task_work_sig(); | |
10094 | } while (ret >= 0); | |
10095 | mutex_lock(&ctx->uring_lock); | |
10096 | ||
10097 | if (ret) | |
10098 | io_refs_resurrect(&ctx->refs, &ctx->ref_comp); | |
10099 | return ret; | |
10100 | } | |
10101 | ||
edafccee JA |
10102 | static int __io_uring_register(struct io_ring_ctx *ctx, unsigned opcode, |
10103 | void __user *arg, unsigned nr_args) | |
b19062a5 JA |
10104 | __releases(ctx->uring_lock) |
10105 | __acquires(ctx->uring_lock) | |
edafccee JA |
10106 | { |
10107 | int ret; | |
10108 | ||
35fa71a0 JA |
10109 | /* |
10110 | * We're inside the ring mutex, if the ref is already dying, then | |
10111 | * someone else killed the ctx or is already going through | |
10112 | * io_uring_register(). | |
10113 | */ | |
10114 | if (percpu_ref_is_dying(&ctx->refs)) | |
10115 | return -ENXIO; | |
10116 | ||
75c4021a PB |
10117 | if (ctx->restricted) { |
10118 | if (opcode >= IORING_REGISTER_LAST) | |
10119 | return -EINVAL; | |
10120 | opcode = array_index_nospec(opcode, IORING_REGISTER_LAST); | |
10121 | if (!test_bit(opcode, ctx->restrictions.register_op)) | |
10122 | return -EACCES; | |
10123 | } | |
10124 | ||
071698e1 | 10125 | if (io_register_op_must_quiesce(opcode)) { |
e73c5c7c PB |
10126 | ret = io_ctx_quiesce(ctx); |
10127 | if (ret) | |
f70865db | 10128 | return ret; |
05f3fb3c | 10129 | } |
edafccee JA |
10130 | |
10131 | switch (opcode) { | |
10132 | case IORING_REGISTER_BUFFERS: | |
634d00df | 10133 | ret = io_sqe_buffers_register(ctx, arg, nr_args, NULL); |
edafccee JA |
10134 | break; |
10135 | case IORING_UNREGISTER_BUFFERS: | |
10136 | ret = -EINVAL; | |
10137 | if (arg || nr_args) | |
10138 | break; | |
0a96bbe4 | 10139 | ret = io_sqe_buffers_unregister(ctx); |
edafccee | 10140 | break; |
6b06314c | 10141 | case IORING_REGISTER_FILES: |
792e3582 | 10142 | ret = io_sqe_files_register(ctx, arg, nr_args, NULL); |
6b06314c JA |
10143 | break; |
10144 | case IORING_UNREGISTER_FILES: | |
10145 | ret = -EINVAL; | |
10146 | if (arg || nr_args) | |
10147 | break; | |
10148 | ret = io_sqe_files_unregister(ctx); | |
10149 | break; | |
c3a31e60 | 10150 | case IORING_REGISTER_FILES_UPDATE: |
c3bdad02 | 10151 | ret = io_register_files_update(ctx, arg, nr_args); |
c3a31e60 | 10152 | break; |
9b402849 | 10153 | case IORING_REGISTER_EVENTFD: |
f2842ab5 | 10154 | case IORING_REGISTER_EVENTFD_ASYNC: |
9b402849 JA |
10155 | ret = -EINVAL; |
10156 | if (nr_args != 1) | |
10157 | break; | |
10158 | ret = io_eventfd_register(ctx, arg); | |
f2842ab5 JA |
10159 | if (ret) |
10160 | break; | |
10161 | if (opcode == IORING_REGISTER_EVENTFD_ASYNC) | |
10162 | ctx->eventfd_async = 1; | |
10163 | else | |
10164 | ctx->eventfd_async = 0; | |
9b402849 JA |
10165 | break; |
10166 | case IORING_UNREGISTER_EVENTFD: | |
10167 | ret = -EINVAL; | |
10168 | if (arg || nr_args) | |
10169 | break; | |
10170 | ret = io_eventfd_unregister(ctx); | |
10171 | break; | |
66f4af93 JA |
10172 | case IORING_REGISTER_PROBE: |
10173 | ret = -EINVAL; | |
10174 | if (!arg || nr_args > 256) | |
10175 | break; | |
10176 | ret = io_probe(ctx, arg, nr_args); | |
10177 | break; | |
071698e1 JA |
10178 | case IORING_REGISTER_PERSONALITY: |
10179 | ret = -EINVAL; | |
10180 | if (arg || nr_args) | |
10181 | break; | |
10182 | ret = io_register_personality(ctx); | |
10183 | break; | |
10184 | case IORING_UNREGISTER_PERSONALITY: | |
10185 | ret = -EINVAL; | |
10186 | if (arg) | |
10187 | break; | |
10188 | ret = io_unregister_personality(ctx, nr_args); | |
10189 | break; | |
7e84e1c7 SG |
10190 | case IORING_REGISTER_ENABLE_RINGS: |
10191 | ret = -EINVAL; | |
10192 | if (arg || nr_args) | |
10193 | break; | |
10194 | ret = io_register_enable_rings(ctx); | |
10195 | break; | |
21b55dbc SG |
10196 | case IORING_REGISTER_RESTRICTIONS: |
10197 | ret = io_register_restrictions(ctx, arg, nr_args); | |
10198 | break; | |
992da01a PB |
10199 | case IORING_REGISTER_FILES2: |
10200 | ret = io_register_rsrc(ctx, arg, nr_args, IORING_RSRC_FILE); | |
10201 | break; | |
10202 | case IORING_REGISTER_FILES_UPDATE2: | |
10203 | ret = io_register_rsrc_update(ctx, arg, nr_args, | |
10204 | IORING_RSRC_FILE); | |
10205 | break; | |
10206 | case IORING_REGISTER_BUFFERS2: | |
10207 | ret = io_register_rsrc(ctx, arg, nr_args, IORING_RSRC_BUFFER); | |
792e3582 | 10208 | break; |
992da01a PB |
10209 | case IORING_REGISTER_BUFFERS_UPDATE: |
10210 | ret = io_register_rsrc_update(ctx, arg, nr_args, | |
10211 | IORING_RSRC_BUFFER); | |
c3bdad02 | 10212 | break; |
fe76421d JA |
10213 | case IORING_REGISTER_IOWQ_AFF: |
10214 | ret = -EINVAL; | |
10215 | if (!arg || !nr_args) | |
10216 | break; | |
10217 | ret = io_register_iowq_aff(ctx, arg, nr_args); | |
10218 | break; | |
10219 | case IORING_UNREGISTER_IOWQ_AFF: | |
10220 | ret = -EINVAL; | |
10221 | if (arg || nr_args) | |
10222 | break; | |
10223 | ret = io_unregister_iowq_aff(ctx); | |
10224 | break; | |
edafccee JA |
10225 | default: |
10226 | ret = -EINVAL; | |
10227 | break; | |
10228 | } | |
10229 | ||
071698e1 | 10230 | if (io_register_op_must_quiesce(opcode)) { |
05f3fb3c | 10231 | /* bring the ctx back to life */ |
05f3fb3c | 10232 | percpu_ref_reinit(&ctx->refs); |
0f158b4c | 10233 | reinit_completion(&ctx->ref_comp); |
05f3fb3c | 10234 | } |
edafccee JA |
10235 | return ret; |
10236 | } | |
10237 | ||
10238 | SYSCALL_DEFINE4(io_uring_register, unsigned int, fd, unsigned int, opcode, | |
10239 | void __user *, arg, unsigned int, nr_args) | |
10240 | { | |
10241 | struct io_ring_ctx *ctx; | |
10242 | long ret = -EBADF; | |
10243 | struct fd f; | |
10244 | ||
10245 | f = fdget(fd); | |
10246 | if (!f.file) | |
10247 | return -EBADF; | |
10248 | ||
10249 | ret = -EOPNOTSUPP; | |
10250 | if (f.file->f_op != &io_uring_fops) | |
10251 | goto out_fput; | |
10252 | ||
10253 | ctx = f.file->private_data; | |
10254 | ||
b6c23dd5 PB |
10255 | io_run_task_work(); |
10256 | ||
edafccee JA |
10257 | mutex_lock(&ctx->uring_lock); |
10258 | ret = __io_uring_register(ctx, opcode, arg, nr_args); | |
10259 | mutex_unlock(&ctx->uring_lock); | |
c826bd7a DD |
10260 | trace_io_uring_register(ctx, opcode, ctx->nr_user_files, ctx->nr_user_bufs, |
10261 | ctx->cq_ev_fd != NULL, ret); | |
edafccee JA |
10262 | out_fput: |
10263 | fdput(f); | |
10264 | return ret; | |
10265 | } | |
10266 | ||
2b188cc1 JA |
10267 | static int __init io_uring_init(void) |
10268 | { | |
d7f62e82 SM |
10269 | #define __BUILD_BUG_VERIFY_ELEMENT(stype, eoffset, etype, ename) do { \ |
10270 | BUILD_BUG_ON(offsetof(stype, ename) != eoffset); \ | |
10271 | BUILD_BUG_ON(sizeof(etype) != sizeof_field(stype, ename)); \ | |
10272 | } while (0) | |
10273 | ||
10274 | #define BUILD_BUG_SQE_ELEM(eoffset, etype, ename) \ | |
10275 | __BUILD_BUG_VERIFY_ELEMENT(struct io_uring_sqe, eoffset, etype, ename) | |
10276 | BUILD_BUG_ON(sizeof(struct io_uring_sqe) != 64); | |
10277 | BUILD_BUG_SQE_ELEM(0, __u8, opcode); | |
10278 | BUILD_BUG_SQE_ELEM(1, __u8, flags); | |
10279 | BUILD_BUG_SQE_ELEM(2, __u16, ioprio); | |
10280 | BUILD_BUG_SQE_ELEM(4, __s32, fd); | |
10281 | BUILD_BUG_SQE_ELEM(8, __u64, off); | |
10282 | BUILD_BUG_SQE_ELEM(8, __u64, addr2); | |
10283 | BUILD_BUG_SQE_ELEM(16, __u64, addr); | |
7d67af2c | 10284 | BUILD_BUG_SQE_ELEM(16, __u64, splice_off_in); |
d7f62e82 SM |
10285 | BUILD_BUG_SQE_ELEM(24, __u32, len); |
10286 | BUILD_BUG_SQE_ELEM(28, __kernel_rwf_t, rw_flags); | |
10287 | BUILD_BUG_SQE_ELEM(28, /* compat */ int, rw_flags); | |
10288 | BUILD_BUG_SQE_ELEM(28, /* compat */ __u32, rw_flags); | |
10289 | BUILD_BUG_SQE_ELEM(28, __u32, fsync_flags); | |
5769a351 JX |
10290 | BUILD_BUG_SQE_ELEM(28, /* compat */ __u16, poll_events); |
10291 | BUILD_BUG_SQE_ELEM(28, __u32, poll32_events); | |
d7f62e82 SM |
10292 | BUILD_BUG_SQE_ELEM(28, __u32, sync_range_flags); |
10293 | BUILD_BUG_SQE_ELEM(28, __u32, msg_flags); | |
10294 | BUILD_BUG_SQE_ELEM(28, __u32, timeout_flags); | |
10295 | BUILD_BUG_SQE_ELEM(28, __u32, accept_flags); | |
10296 | BUILD_BUG_SQE_ELEM(28, __u32, cancel_flags); | |
10297 | BUILD_BUG_SQE_ELEM(28, __u32, open_flags); | |
10298 | BUILD_BUG_SQE_ELEM(28, __u32, statx_flags); | |
10299 | BUILD_BUG_SQE_ELEM(28, __u32, fadvise_advice); | |
7d67af2c | 10300 | BUILD_BUG_SQE_ELEM(28, __u32, splice_flags); |
d7f62e82 SM |
10301 | BUILD_BUG_SQE_ELEM(32, __u64, user_data); |
10302 | BUILD_BUG_SQE_ELEM(40, __u16, buf_index); | |
16340eab | 10303 | BUILD_BUG_SQE_ELEM(40, __u16, buf_group); |
d7f62e82 | 10304 | BUILD_BUG_SQE_ELEM(42, __u16, personality); |
7d67af2c | 10305 | BUILD_BUG_SQE_ELEM(44, __s32, splice_fd_in); |
d7f62e82 | 10306 | |
b0d658ec PB |
10307 | BUILD_BUG_ON(sizeof(struct io_uring_files_update) != |
10308 | sizeof(struct io_uring_rsrc_update)); | |
10309 | BUILD_BUG_ON(sizeof(struct io_uring_rsrc_update) > | |
10310 | sizeof(struct io_uring_rsrc_update2)); | |
10311 | /* should fit into one byte */ | |
10312 | BUILD_BUG_ON(SQE_VALID_FLAGS >= (1 << 8)); | |
10313 | ||
d3656344 | 10314 | BUILD_BUG_ON(ARRAY_SIZE(io_op_defs) != IORING_OP_LAST); |
84557871 | 10315 | BUILD_BUG_ON(__REQ_F_LAST_BIT >= 8 * sizeof(int)); |
16340eab | 10316 | |
91f245d5 JA |
10317 | req_cachep = KMEM_CACHE(io_kiocb, SLAB_HWCACHE_ALIGN | SLAB_PANIC | |
10318 | SLAB_ACCOUNT); | |
2b188cc1 JA |
10319 | return 0; |
10320 | }; | |
10321 | __initcall(io_uring_init); |