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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 | |
14 | * through a control-dependency in io_get_cqring (smp_store_release to | |
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> | |
6c271ce2 | 60 | #include <linux/kthread.h> |
2b188cc1 | 61 | #include <linux/blkdev.h> |
edafccee | 62 | #include <linux/bvec.h> |
2b188cc1 JA |
63 | #include <linux/net.h> |
64 | #include <net/sock.h> | |
65 | #include <net/af_unix.h> | |
6b06314c | 66 | #include <net/scm.h> |
2b188cc1 JA |
67 | #include <linux/anon_inodes.h> |
68 | #include <linux/sched/mm.h> | |
69 | #include <linux/uaccess.h> | |
70 | #include <linux/nospec.h> | |
edafccee JA |
71 | #include <linux/sizes.h> |
72 | #include <linux/hugetlb.h> | |
aa4c3967 | 73 | #include <linux/highmem.h> |
15b71abe JA |
74 | #include <linux/namei.h> |
75 | #include <linux/fsnotify.h> | |
4840e418 | 76 | #include <linux/fadvise.h> |
3e4827b0 | 77 | #include <linux/eventpoll.h> |
ff002b30 | 78 | #include <linux/fs_struct.h> |
7d67af2c | 79 | #include <linux/splice.h> |
b41e9852 | 80 | #include <linux/task_work.h> |
bcf5a063 | 81 | #include <linux/pagemap.h> |
0f212204 | 82 | #include <linux/io_uring.h> |
91d8f519 | 83 | #include <linux/blk-cgroup.h> |
4ea33a97 | 84 | #include <linux/audit.h> |
2b188cc1 | 85 | |
c826bd7a DD |
86 | #define CREATE_TRACE_POINTS |
87 | #include <trace/events/io_uring.h> | |
88 | ||
2b188cc1 JA |
89 | #include <uapi/linux/io_uring.h> |
90 | ||
91 | #include "internal.h" | |
561fb04a | 92 | #include "io-wq.h" |
2b188cc1 | 93 | |
5277deaa | 94 | #define IORING_MAX_ENTRIES 32768 |
33a107f0 | 95 | #define IORING_MAX_CQ_ENTRIES (2 * IORING_MAX_ENTRIES) |
65e19f54 JA |
96 | |
97 | /* | |
98 | * Shift of 9 is 512 entries, or exactly one page on 64-bit archs | |
99 | */ | |
100 | #define IORING_FILE_TABLE_SHIFT 9 | |
101 | #define IORING_MAX_FILES_TABLE (1U << IORING_FILE_TABLE_SHIFT) | |
102 | #define IORING_FILE_TABLE_MASK (IORING_MAX_FILES_TABLE - 1) | |
103 | #define IORING_MAX_FIXED_FILES (64 * IORING_MAX_FILES_TABLE) | |
21b55dbc SG |
104 | #define IORING_MAX_RESTRICTIONS (IORING_RESTRICTION_LAST + \ |
105 | IORING_REGISTER_LAST + IORING_OP_LAST) | |
2b188cc1 JA |
106 | |
107 | struct io_uring { | |
108 | u32 head ____cacheline_aligned_in_smp; | |
109 | u32 tail ____cacheline_aligned_in_smp; | |
110 | }; | |
111 | ||
1e84b97b | 112 | /* |
75b28aff HV |
113 | * This data is shared with the application through the mmap at offsets |
114 | * IORING_OFF_SQ_RING and IORING_OFF_CQ_RING. | |
1e84b97b SB |
115 | * |
116 | * The offsets to the member fields are published through struct | |
117 | * io_sqring_offsets when calling io_uring_setup. | |
118 | */ | |
75b28aff | 119 | struct io_rings { |
1e84b97b SB |
120 | /* |
121 | * Head and tail offsets into the ring; the offsets need to be | |
122 | * masked to get valid indices. | |
123 | * | |
75b28aff HV |
124 | * The kernel controls head of the sq ring and the tail of the cq ring, |
125 | * and the application controls tail of the sq ring and the head of the | |
126 | * cq ring. | |
1e84b97b | 127 | */ |
75b28aff | 128 | struct io_uring sq, cq; |
1e84b97b | 129 | /* |
75b28aff | 130 | * Bitmasks to apply to head and tail offsets (constant, equals |
1e84b97b SB |
131 | * ring_entries - 1) |
132 | */ | |
75b28aff HV |
133 | u32 sq_ring_mask, cq_ring_mask; |
134 | /* Ring sizes (constant, power of 2) */ | |
135 | u32 sq_ring_entries, cq_ring_entries; | |
1e84b97b SB |
136 | /* |
137 | * Number of invalid entries dropped by the kernel due to | |
138 | * invalid index stored in array | |
139 | * | |
140 | * Written by the kernel, shouldn't be modified by the | |
141 | * application (i.e. get number of "new events" by comparing to | |
142 | * cached value). | |
143 | * | |
144 | * After a new SQ head value was read by the application this | |
145 | * counter includes all submissions that were dropped reaching | |
146 | * the new SQ head (and possibly more). | |
147 | */ | |
75b28aff | 148 | u32 sq_dropped; |
1e84b97b | 149 | /* |
0d9b5b3a | 150 | * Runtime SQ flags |
1e84b97b SB |
151 | * |
152 | * Written by the kernel, shouldn't be modified by the | |
153 | * application. | |
154 | * | |
155 | * The application needs a full memory barrier before checking | |
156 | * for IORING_SQ_NEED_WAKEUP after updating the sq tail. | |
157 | */ | |
75b28aff | 158 | u32 sq_flags; |
0d9b5b3a SG |
159 | /* |
160 | * Runtime CQ flags | |
161 | * | |
162 | * Written by the application, shouldn't be modified by the | |
163 | * kernel. | |
164 | */ | |
165 | u32 cq_flags; | |
1e84b97b SB |
166 | /* |
167 | * Number of completion events lost because the queue was full; | |
168 | * this should be avoided by the application by making sure | |
0b4295b5 | 169 | * there are not more requests pending than there is space in |
1e84b97b SB |
170 | * the completion queue. |
171 | * | |
172 | * Written by the kernel, shouldn't be modified by the | |
173 | * application (i.e. get number of "new events" by comparing to | |
174 | * cached value). | |
175 | * | |
176 | * As completion events come in out of order this counter is not | |
177 | * ordered with any other data. | |
178 | */ | |
75b28aff | 179 | u32 cq_overflow; |
1e84b97b SB |
180 | /* |
181 | * Ring buffer of completion events. | |
182 | * | |
183 | * The kernel writes completion events fresh every time they are | |
184 | * produced, so the application is allowed to modify pending | |
185 | * entries. | |
186 | */ | |
75b28aff | 187 | struct io_uring_cqe cqes[] ____cacheline_aligned_in_smp; |
2b188cc1 JA |
188 | }; |
189 | ||
edafccee JA |
190 | struct io_mapped_ubuf { |
191 | u64 ubuf; | |
192 | size_t len; | |
193 | struct bio_vec *bvec; | |
194 | unsigned int nr_bvecs; | |
de293938 | 195 | unsigned long acct_pages; |
edafccee JA |
196 | }; |
197 | ||
65e19f54 JA |
198 | struct fixed_file_table { |
199 | struct file **files; | |
31b51510 JA |
200 | }; |
201 | ||
05589553 XW |
202 | struct fixed_file_ref_node { |
203 | struct percpu_ref refs; | |
204 | struct list_head node; | |
205 | struct list_head file_list; | |
206 | struct fixed_file_data *file_data; | |
4a38aed2 | 207 | struct llist_node llist; |
e297822b | 208 | bool done; |
05589553 XW |
209 | }; |
210 | ||
05f3fb3c JA |
211 | struct fixed_file_data { |
212 | struct fixed_file_table *table; | |
213 | struct io_ring_ctx *ctx; | |
214 | ||
b2e96852 | 215 | struct fixed_file_ref_node *node; |
05f3fb3c | 216 | struct percpu_ref refs; |
05f3fb3c | 217 | struct completion done; |
05589553 XW |
218 | struct list_head ref_list; |
219 | spinlock_t lock; | |
05f3fb3c JA |
220 | }; |
221 | ||
5a2e745d JA |
222 | struct io_buffer { |
223 | struct list_head list; | |
224 | __u64 addr; | |
225 | __s32 len; | |
226 | __u16 bid; | |
227 | }; | |
228 | ||
21b55dbc SG |
229 | struct io_restriction { |
230 | DECLARE_BITMAP(register_op, IORING_REGISTER_LAST); | |
231 | DECLARE_BITMAP(sqe_op, IORING_OP_LAST); | |
232 | u8 sqe_flags_allowed; | |
233 | u8 sqe_flags_required; | |
7e84e1c7 | 234 | bool registered; |
21b55dbc SG |
235 | }; |
236 | ||
534ca6d6 JA |
237 | struct io_sq_data { |
238 | refcount_t refs; | |
69fb2131 JA |
239 | struct mutex lock; |
240 | ||
241 | /* ctx's that are using this sqd */ | |
242 | struct list_head ctx_list; | |
243 | struct list_head ctx_new_list; | |
244 | struct mutex ctx_lock; | |
245 | ||
534ca6d6 JA |
246 | struct task_struct *thread; |
247 | struct wait_queue_head wait; | |
248 | }; | |
249 | ||
2b188cc1 JA |
250 | struct io_ring_ctx { |
251 | struct { | |
252 | struct percpu_ref refs; | |
253 | } ____cacheline_aligned_in_smp; | |
254 | ||
255 | struct { | |
256 | unsigned int flags; | |
e1d85334 | 257 | unsigned int compat: 1; |
aad5d8da | 258 | unsigned int limit_mem: 1; |
e1d85334 RD |
259 | unsigned int cq_overflow_flushed: 1; |
260 | unsigned int drain_next: 1; | |
261 | unsigned int eventfd_async: 1; | |
21b55dbc | 262 | unsigned int restricted: 1; |
2b188cc1 | 263 | |
75b28aff HV |
264 | /* |
265 | * Ring buffer of indices into array of io_uring_sqe, which is | |
266 | * mmapped by the application using the IORING_OFF_SQES offset. | |
267 | * | |
268 | * This indirection could e.g. be used to assign fixed | |
269 | * io_uring_sqe entries to operations and only submit them to | |
270 | * the queue when needed. | |
271 | * | |
272 | * The kernel modifies neither the indices array nor the entries | |
273 | * array. | |
274 | */ | |
275 | u32 *sq_array; | |
2b188cc1 JA |
276 | unsigned cached_sq_head; |
277 | unsigned sq_entries; | |
278 | unsigned sq_mask; | |
6c271ce2 | 279 | unsigned sq_thread_idle; |
498ccd9e | 280 | unsigned cached_sq_dropped; |
2c3bac6d | 281 | unsigned cached_cq_overflow; |
ad3eb2c8 | 282 | unsigned long sq_check_overflow; |
de0617e4 JA |
283 | |
284 | struct list_head defer_list; | |
5262f567 | 285 | struct list_head timeout_list; |
1d7bb1d5 | 286 | struct list_head cq_overflow_list; |
fcb323cc JA |
287 | |
288 | wait_queue_head_t inflight_wait; | |
ad3eb2c8 | 289 | struct io_uring_sqe *sq_sqes; |
2b188cc1 JA |
290 | } ____cacheline_aligned_in_smp; |
291 | ||
206aefde JA |
292 | struct io_rings *rings; |
293 | ||
2b188cc1 | 294 | /* IO offload */ |
561fb04a | 295 | struct io_wq *io_wq; |
2aede0e4 JA |
296 | |
297 | /* | |
298 | * For SQPOLL usage - we hold a reference to the parent task, so we | |
299 | * have access to the ->files | |
300 | */ | |
301 | struct task_struct *sqo_task; | |
302 | ||
303 | /* Only used for accounting purposes */ | |
304 | struct mm_struct *mm_account; | |
305 | ||
91d8f519 DZ |
306 | #ifdef CONFIG_BLK_CGROUP |
307 | struct cgroup_subsys_state *sqo_blkcg_css; | |
308 | #endif | |
309 | ||
534ca6d6 JA |
310 | struct io_sq_data *sq_data; /* if using sq thread polling */ |
311 | ||
90554200 | 312 | struct wait_queue_head sqo_sq_wait; |
6a779382 | 313 | struct wait_queue_entry sqo_wait_entry; |
69fb2131 | 314 | struct list_head sqd_list; |
75b28aff | 315 | |
6b06314c JA |
316 | /* |
317 | * If used, fixed file set. Writers must ensure that ->refs is dead, | |
318 | * readers must ensure that ->refs is alive as long as the file* is | |
319 | * used. Only updated through io_uring_register(2). | |
320 | */ | |
05f3fb3c | 321 | struct fixed_file_data *file_data; |
6b06314c JA |
322 | unsigned nr_user_files; |
323 | ||
edafccee JA |
324 | /* if used, fixed mapped user buffers */ |
325 | unsigned nr_user_bufs; | |
326 | struct io_mapped_ubuf *user_bufs; | |
327 | ||
2b188cc1 JA |
328 | struct user_struct *user; |
329 | ||
0b8c0ec7 | 330 | const struct cred *creds; |
181e448d | 331 | |
4ea33a97 JA |
332 | #ifdef CONFIG_AUDIT |
333 | kuid_t loginuid; | |
334 | unsigned int sessionid; | |
335 | #endif | |
336 | ||
0f158b4c JA |
337 | struct completion ref_comp; |
338 | struct completion sq_thread_comp; | |
206aefde | 339 | |
0ddf92e8 JA |
340 | /* if all else fails... */ |
341 | struct io_kiocb *fallback_req; | |
342 | ||
206aefde JA |
343 | #if defined(CONFIG_UNIX) |
344 | struct socket *ring_sock; | |
345 | #endif | |
346 | ||
5a2e745d JA |
347 | struct idr io_buffer_idr; |
348 | ||
071698e1 JA |
349 | struct idr personality_idr; |
350 | ||
206aefde JA |
351 | struct { |
352 | unsigned cached_cq_tail; | |
353 | unsigned cq_entries; | |
354 | unsigned cq_mask; | |
355 | atomic_t cq_timeouts; | |
ad3eb2c8 | 356 | unsigned long cq_check_overflow; |
206aefde JA |
357 | struct wait_queue_head cq_wait; |
358 | struct fasync_struct *cq_fasync; | |
359 | struct eventfd_ctx *cq_ev_fd; | |
360 | } ____cacheline_aligned_in_smp; | |
2b188cc1 JA |
361 | |
362 | struct { | |
363 | struct mutex uring_lock; | |
364 | wait_queue_head_t wait; | |
365 | } ____cacheline_aligned_in_smp; | |
366 | ||
367 | struct { | |
368 | spinlock_t completion_lock; | |
e94f141b | 369 | |
def596e9 | 370 | /* |
540e32a0 | 371 | * ->iopoll_list is protected by the ctx->uring_lock for |
def596e9 JA |
372 | * io_uring instances that don't use IORING_SETUP_SQPOLL. |
373 | * For SQPOLL, only the single threaded io_sq_thread() will | |
374 | * manipulate the list, hence no extra locking is needed there. | |
375 | */ | |
540e32a0 | 376 | struct list_head iopoll_list; |
78076bb6 JA |
377 | struct hlist_head *cancel_hash; |
378 | unsigned cancel_hash_bits; | |
e94f141b | 379 | bool poll_multi_file; |
31b51510 | 380 | |
fcb323cc JA |
381 | spinlock_t inflight_lock; |
382 | struct list_head inflight_list; | |
2b188cc1 | 383 | } ____cacheline_aligned_in_smp; |
85faa7b8 | 384 | |
4a38aed2 JA |
385 | struct delayed_work file_put_work; |
386 | struct llist_head file_put_llist; | |
387 | ||
85faa7b8 | 388 | struct work_struct exit_work; |
21b55dbc | 389 | struct io_restriction restrictions; |
2b188cc1 JA |
390 | }; |
391 | ||
09bb8394 JA |
392 | /* |
393 | * First field must be the file pointer in all the | |
394 | * iocb unions! See also 'struct kiocb' in <linux/fs.h> | |
395 | */ | |
221c5eb2 JA |
396 | struct io_poll_iocb { |
397 | struct file *file; | |
0969e783 JA |
398 | union { |
399 | struct wait_queue_head *head; | |
400 | u64 addr; | |
401 | }; | |
221c5eb2 | 402 | __poll_t events; |
8c838788 | 403 | bool done; |
221c5eb2 | 404 | bool canceled; |
392edb45 | 405 | struct wait_queue_entry wait; |
221c5eb2 JA |
406 | }; |
407 | ||
b5dba59e JA |
408 | struct io_close { |
409 | struct file *file; | |
410 | struct file *put_file; | |
411 | int fd; | |
412 | }; | |
413 | ||
ad8a48ac JA |
414 | struct io_timeout_data { |
415 | struct io_kiocb *req; | |
416 | struct hrtimer timer; | |
417 | struct timespec64 ts; | |
418 | enum hrtimer_mode mode; | |
419 | }; | |
420 | ||
8ed8d3c3 JA |
421 | struct io_accept { |
422 | struct file *file; | |
423 | struct sockaddr __user *addr; | |
424 | int __user *addr_len; | |
425 | int flags; | |
09952e3e | 426 | unsigned long nofile; |
8ed8d3c3 JA |
427 | }; |
428 | ||
429 | struct io_sync { | |
430 | struct file *file; | |
431 | loff_t len; | |
432 | loff_t off; | |
433 | int flags; | |
d63d1b5e | 434 | int mode; |
8ed8d3c3 JA |
435 | }; |
436 | ||
fbf23849 JA |
437 | struct io_cancel { |
438 | struct file *file; | |
439 | u64 addr; | |
440 | }; | |
441 | ||
b29472ee JA |
442 | struct io_timeout { |
443 | struct file *file; | |
bfe68a22 PB |
444 | u32 off; |
445 | u32 target_seq; | |
135fcde8 | 446 | struct list_head list; |
b29472ee JA |
447 | }; |
448 | ||
0bdf7a2d PB |
449 | struct io_timeout_rem { |
450 | struct file *file; | |
451 | u64 addr; | |
452 | }; | |
453 | ||
9adbd45d JA |
454 | struct io_rw { |
455 | /* NOTE: kiocb has the file as the first member, so don't do it here */ | |
456 | struct kiocb kiocb; | |
457 | u64 addr; | |
458 | u64 len; | |
459 | }; | |
460 | ||
3fbb51c1 JA |
461 | struct io_connect { |
462 | struct file *file; | |
463 | struct sockaddr __user *addr; | |
464 | int addr_len; | |
465 | }; | |
466 | ||
e47293fd JA |
467 | struct io_sr_msg { |
468 | struct file *file; | |
fddaface | 469 | union { |
270a5940 | 470 | struct user_msghdr __user *umsg; |
fddaface JA |
471 | void __user *buf; |
472 | }; | |
e47293fd | 473 | int msg_flags; |
bcda7baa | 474 | int bgid; |
fddaface | 475 | size_t len; |
bcda7baa | 476 | struct io_buffer *kbuf; |
e47293fd JA |
477 | }; |
478 | ||
15b71abe JA |
479 | struct io_open { |
480 | struct file *file; | |
481 | int dfd; | |
944d1444 | 482 | bool ignore_nonblock; |
15b71abe | 483 | struct filename *filename; |
c12cedf2 | 484 | struct open_how how; |
4022e7af | 485 | unsigned long nofile; |
15b71abe JA |
486 | }; |
487 | ||
05f3fb3c JA |
488 | struct io_files_update { |
489 | struct file *file; | |
490 | u64 arg; | |
491 | u32 nr_args; | |
492 | u32 offset; | |
493 | }; | |
494 | ||
4840e418 JA |
495 | struct io_fadvise { |
496 | struct file *file; | |
497 | u64 offset; | |
498 | u32 len; | |
499 | u32 advice; | |
500 | }; | |
501 | ||
c1ca757b JA |
502 | struct io_madvise { |
503 | struct file *file; | |
504 | u64 addr; | |
505 | u32 len; | |
506 | u32 advice; | |
507 | }; | |
508 | ||
3e4827b0 JA |
509 | struct io_epoll { |
510 | struct file *file; | |
511 | int epfd; | |
512 | int op; | |
513 | int fd; | |
514 | struct epoll_event event; | |
e47293fd JA |
515 | }; |
516 | ||
7d67af2c PB |
517 | struct io_splice { |
518 | struct file *file_out; | |
519 | struct file *file_in; | |
520 | loff_t off_out; | |
521 | loff_t off_in; | |
522 | u64 len; | |
523 | unsigned int flags; | |
524 | }; | |
525 | ||
ddf0322d JA |
526 | struct io_provide_buf { |
527 | struct file *file; | |
528 | __u64 addr; | |
529 | __s32 len; | |
530 | __u32 bgid; | |
531 | __u16 nbufs; | |
532 | __u16 bid; | |
533 | }; | |
534 | ||
1d9e1288 BM |
535 | struct io_statx { |
536 | struct file *file; | |
537 | int dfd; | |
538 | unsigned int mask; | |
539 | unsigned int flags; | |
e62753e4 | 540 | const char __user *filename; |
1d9e1288 BM |
541 | struct statx __user *buffer; |
542 | }; | |
543 | ||
36f4fa68 JA |
544 | struct io_shutdown { |
545 | struct file *file; | |
546 | int how; | |
547 | }; | |
548 | ||
80a261fd JA |
549 | struct io_rename { |
550 | struct file *file; | |
551 | int old_dfd; | |
552 | int new_dfd; | |
553 | struct filename *oldpath; | |
554 | struct filename *newpath; | |
555 | int flags; | |
556 | }; | |
557 | ||
3ca405eb PB |
558 | struct io_completion { |
559 | struct file *file; | |
560 | struct list_head list; | |
0f7e466b | 561 | int cflags; |
3ca405eb PB |
562 | }; |
563 | ||
f499a021 JA |
564 | struct io_async_connect { |
565 | struct sockaddr_storage address; | |
566 | }; | |
567 | ||
03b1230c JA |
568 | struct io_async_msghdr { |
569 | struct iovec fast_iov[UIO_FASTIOV]; | |
570 | struct iovec *iov; | |
571 | struct sockaddr __user *uaddr; | |
572 | struct msghdr msg; | |
b537916c | 573 | struct sockaddr_storage addr; |
03b1230c JA |
574 | }; |
575 | ||
f67676d1 JA |
576 | struct io_async_rw { |
577 | struct iovec fast_iov[UIO_FASTIOV]; | |
ff6165b2 JA |
578 | const struct iovec *free_iovec; |
579 | struct iov_iter iter; | |
227c0c96 | 580 | size_t bytes_done; |
bcf5a063 | 581 | struct wait_page_queue wpq; |
f67676d1 JA |
582 | }; |
583 | ||
6b47ee6e PB |
584 | enum { |
585 | REQ_F_FIXED_FILE_BIT = IOSQE_FIXED_FILE_BIT, | |
586 | REQ_F_IO_DRAIN_BIT = IOSQE_IO_DRAIN_BIT, | |
587 | REQ_F_LINK_BIT = IOSQE_IO_LINK_BIT, | |
588 | REQ_F_HARDLINK_BIT = IOSQE_IO_HARDLINK_BIT, | |
589 | REQ_F_FORCE_ASYNC_BIT = IOSQE_ASYNC_BIT, | |
bcda7baa | 590 | REQ_F_BUFFER_SELECT_BIT = IOSQE_BUFFER_SELECT_BIT, |
6b47ee6e | 591 | |
dea3b49c | 592 | REQ_F_LINK_HEAD_BIT, |
6b47ee6e PB |
593 | REQ_F_FAIL_LINK_BIT, |
594 | REQ_F_INFLIGHT_BIT, | |
595 | REQ_F_CUR_POS_BIT, | |
596 | REQ_F_NOWAIT_BIT, | |
6b47ee6e | 597 | REQ_F_LINK_TIMEOUT_BIT, |
6b47ee6e | 598 | REQ_F_ISREG_BIT, |
99bc4c38 | 599 | REQ_F_NEED_CLEANUP_BIT, |
d7718a9d | 600 | REQ_F_POLLED_BIT, |
bcda7baa | 601 | REQ_F_BUFFER_SELECTED_BIT, |
5b0bbee4 | 602 | REQ_F_NO_FILE_TABLE_BIT, |
7cdaf587 | 603 | REQ_F_WORK_INITIALIZED_BIT, |
900fad45 | 604 | REQ_F_LTIMEOUT_ACTIVE_BIT, |
84557871 JA |
605 | |
606 | /* not a real bit, just to check we're not overflowing the space */ | |
607 | __REQ_F_LAST_BIT, | |
6b47ee6e PB |
608 | }; |
609 | ||
610 | enum { | |
611 | /* ctx owns file */ | |
612 | REQ_F_FIXED_FILE = BIT(REQ_F_FIXED_FILE_BIT), | |
613 | /* drain existing IO first */ | |
614 | REQ_F_IO_DRAIN = BIT(REQ_F_IO_DRAIN_BIT), | |
615 | /* linked sqes */ | |
616 | REQ_F_LINK = BIT(REQ_F_LINK_BIT), | |
617 | /* doesn't sever on completion < 0 */ | |
618 | REQ_F_HARDLINK = BIT(REQ_F_HARDLINK_BIT), | |
619 | /* IOSQE_ASYNC */ | |
620 | REQ_F_FORCE_ASYNC = BIT(REQ_F_FORCE_ASYNC_BIT), | |
bcda7baa JA |
621 | /* IOSQE_BUFFER_SELECT */ |
622 | REQ_F_BUFFER_SELECT = BIT(REQ_F_BUFFER_SELECT_BIT), | |
6b47ee6e | 623 | |
dea3b49c PB |
624 | /* head of a link */ |
625 | REQ_F_LINK_HEAD = BIT(REQ_F_LINK_HEAD_BIT), | |
6b47ee6e PB |
626 | /* fail rest of links */ |
627 | REQ_F_FAIL_LINK = BIT(REQ_F_FAIL_LINK_BIT), | |
628 | /* on inflight list */ | |
629 | REQ_F_INFLIGHT = BIT(REQ_F_INFLIGHT_BIT), | |
630 | /* read/write uses file position */ | |
631 | REQ_F_CUR_POS = BIT(REQ_F_CUR_POS_BIT), | |
632 | /* must not punt to workers */ | |
633 | REQ_F_NOWAIT = BIT(REQ_F_NOWAIT_BIT), | |
900fad45 | 634 | /* has or had linked timeout */ |
6b47ee6e | 635 | REQ_F_LINK_TIMEOUT = BIT(REQ_F_LINK_TIMEOUT_BIT), |
6b47ee6e PB |
636 | /* regular file */ |
637 | REQ_F_ISREG = BIT(REQ_F_ISREG_BIT), | |
99bc4c38 PB |
638 | /* needs cleanup */ |
639 | REQ_F_NEED_CLEANUP = BIT(REQ_F_NEED_CLEANUP_BIT), | |
d7718a9d JA |
640 | /* already went through poll handler */ |
641 | REQ_F_POLLED = BIT(REQ_F_POLLED_BIT), | |
bcda7baa JA |
642 | /* buffer already selected */ |
643 | REQ_F_BUFFER_SELECTED = BIT(REQ_F_BUFFER_SELECTED_BIT), | |
5b0bbee4 JA |
644 | /* doesn't need file table for this request */ |
645 | REQ_F_NO_FILE_TABLE = BIT(REQ_F_NO_FILE_TABLE_BIT), | |
7cdaf587 XW |
646 | /* io_wq_work is initialized */ |
647 | REQ_F_WORK_INITIALIZED = BIT(REQ_F_WORK_INITIALIZED_BIT), | |
900fad45 PB |
648 | /* linked timeout is active, i.e. prepared by link's head */ |
649 | REQ_F_LTIMEOUT_ACTIVE = BIT(REQ_F_LTIMEOUT_ACTIVE_BIT), | |
d7718a9d JA |
650 | }; |
651 | ||
652 | struct async_poll { | |
653 | struct io_poll_iocb poll; | |
807abcb0 | 654 | struct io_poll_iocb *double_poll; |
6b47ee6e PB |
655 | }; |
656 | ||
09bb8394 JA |
657 | /* |
658 | * NOTE! Each of the iocb union members has the file pointer | |
659 | * as the first entry in their struct definition. So you can | |
660 | * access the file pointer through any of the sub-structs, | |
661 | * or directly as just 'ki_filp' in this struct. | |
662 | */ | |
2b188cc1 | 663 | struct io_kiocb { |
221c5eb2 | 664 | union { |
09bb8394 | 665 | struct file *file; |
9adbd45d | 666 | struct io_rw rw; |
221c5eb2 | 667 | struct io_poll_iocb poll; |
8ed8d3c3 JA |
668 | struct io_accept accept; |
669 | struct io_sync sync; | |
fbf23849 | 670 | struct io_cancel cancel; |
b29472ee | 671 | struct io_timeout timeout; |
0bdf7a2d | 672 | struct io_timeout_rem timeout_rem; |
3fbb51c1 | 673 | struct io_connect connect; |
e47293fd | 674 | struct io_sr_msg sr_msg; |
15b71abe | 675 | struct io_open open; |
b5dba59e | 676 | struct io_close close; |
05f3fb3c | 677 | struct io_files_update files_update; |
4840e418 | 678 | struct io_fadvise fadvise; |
c1ca757b | 679 | struct io_madvise madvise; |
3e4827b0 | 680 | struct io_epoll epoll; |
7d67af2c | 681 | struct io_splice splice; |
ddf0322d | 682 | struct io_provide_buf pbuf; |
1d9e1288 | 683 | struct io_statx statx; |
36f4fa68 | 684 | struct io_shutdown shutdown; |
80a261fd | 685 | struct io_rename rename; |
3ca405eb PB |
686 | /* use only after cleaning per-op data, see io_clean_op() */ |
687 | struct io_completion compl; | |
221c5eb2 | 688 | }; |
2b188cc1 | 689 | |
e8c2bc1f JA |
690 | /* opcode allocated if it needs to store data for async defer */ |
691 | void *async_data; | |
d625c6ee | 692 | u8 opcode; |
65a6543d XW |
693 | /* polled IO has completed */ |
694 | u8 iopoll_completed; | |
2b188cc1 | 695 | |
4f4eeba8 | 696 | u16 buf_index; |
9cf7c104 | 697 | u32 result; |
4f4eeba8 | 698 | |
010e8e6b PB |
699 | struct io_ring_ctx *ctx; |
700 | unsigned int flags; | |
701 | refcount_t refs; | |
702 | struct task_struct *task; | |
703 | u64 user_data; | |
d7718a9d | 704 | |
010e8e6b | 705 | struct list_head link_list; |
fcb323cc | 706 | |
d21ffe7e PB |
707 | /* |
708 | * 1. used with ctx->iopoll_list with reads/writes | |
709 | * 2. to track reqs with ->files (see io_op_def::file_table) | |
710 | */ | |
010e8e6b PB |
711 | struct list_head inflight_entry; |
712 | ||
713 | struct percpu_ref *fixed_file_refs; | |
714 | struct callback_head task_work; | |
715 | /* for polled requests, i.e. IORING_OP_POLL_ADD and async armed poll */ | |
716 | struct hlist_node hash_node; | |
717 | struct async_poll *apoll; | |
718 | struct io_wq_work work; | |
2b188cc1 | 719 | }; |
05589553 | 720 | |
27dc8338 PB |
721 | struct io_defer_entry { |
722 | struct list_head list; | |
723 | struct io_kiocb *req; | |
9cf7c104 | 724 | u32 seq; |
2b188cc1 JA |
725 | }; |
726 | ||
def596e9 | 727 | #define IO_IOPOLL_BATCH 8 |
2b188cc1 | 728 | |
013538bd JA |
729 | struct io_comp_state { |
730 | unsigned int nr; | |
731 | struct list_head list; | |
732 | struct io_ring_ctx *ctx; | |
733 | }; | |
734 | ||
9a56a232 JA |
735 | struct io_submit_state { |
736 | struct blk_plug plug; | |
737 | ||
2579f913 JA |
738 | /* |
739 | * io_kiocb alloc cache | |
740 | */ | |
741 | void *reqs[IO_IOPOLL_BATCH]; | |
6c8a3134 | 742 | unsigned int free_reqs; |
2579f913 | 743 | |
013538bd JA |
744 | /* |
745 | * Batch completion logic | |
746 | */ | |
747 | struct io_comp_state comp; | |
748 | ||
9a56a232 JA |
749 | /* |
750 | * File reference cache | |
751 | */ | |
752 | struct file *file; | |
753 | unsigned int fd; | |
754 | unsigned int has_refs; | |
9a56a232 JA |
755 | unsigned int ios_left; |
756 | }; | |
757 | ||
d3656344 | 758 | struct io_op_def { |
d3656344 JA |
759 | /* needs req->file assigned */ |
760 | unsigned needs_file : 1; | |
fd2206e4 JA |
761 | /* don't fail if file grab fails */ |
762 | unsigned needs_file_no_error : 1; | |
d3656344 JA |
763 | /* hash wq insertion if file is a regular file */ |
764 | unsigned hash_reg_file : 1; | |
765 | /* unbound wq insertion if file is a non-regular file */ | |
766 | unsigned unbound_nonreg_file : 1; | |
66f4af93 JA |
767 | /* opcode is not supported by this kernel */ |
768 | unsigned not_supported : 1; | |
8a72758c JA |
769 | /* set if opcode supports polled "wait" */ |
770 | unsigned pollin : 1; | |
771 | unsigned pollout : 1; | |
bcda7baa JA |
772 | /* op supports buffer selection */ |
773 | unsigned buffer_select : 1; | |
e8c2bc1f JA |
774 | /* must always have async data allocated */ |
775 | unsigned needs_async_data : 1; | |
776 | /* size of async data needed, if any */ | |
777 | unsigned short async_size; | |
0f203765 | 778 | unsigned work_flags; |
d3656344 JA |
779 | }; |
780 | ||
0918682b | 781 | static const struct io_op_def io_op_defs[] = { |
0463b6c5 PB |
782 | [IORING_OP_NOP] = {}, |
783 | [IORING_OP_READV] = { | |
d3656344 JA |
784 | .needs_file = 1, |
785 | .unbound_nonreg_file = 1, | |
8a72758c | 786 | .pollin = 1, |
4d954c25 | 787 | .buffer_select = 1, |
e8c2bc1f JA |
788 | .needs_async_data = 1, |
789 | .async_size = sizeof(struct io_async_rw), | |
0f203765 | 790 | .work_flags = IO_WQ_WORK_MM | IO_WQ_WORK_BLKCG, |
d3656344 | 791 | }, |
0463b6c5 | 792 | [IORING_OP_WRITEV] = { |
d3656344 JA |
793 | .needs_file = 1, |
794 | .hash_reg_file = 1, | |
795 | .unbound_nonreg_file = 1, | |
8a72758c | 796 | .pollout = 1, |
e8c2bc1f JA |
797 | .needs_async_data = 1, |
798 | .async_size = sizeof(struct io_async_rw), | |
69228338 JA |
799 | .work_flags = IO_WQ_WORK_MM | IO_WQ_WORK_BLKCG | |
800 | IO_WQ_WORK_FSIZE, | |
d3656344 | 801 | }, |
0463b6c5 | 802 | [IORING_OP_FSYNC] = { |
d3656344 | 803 | .needs_file = 1, |
0f203765 | 804 | .work_flags = IO_WQ_WORK_BLKCG, |
d3656344 | 805 | }, |
0463b6c5 | 806 | [IORING_OP_READ_FIXED] = { |
d3656344 JA |
807 | .needs_file = 1, |
808 | .unbound_nonreg_file = 1, | |
8a72758c | 809 | .pollin = 1, |
e8c2bc1f | 810 | .async_size = sizeof(struct io_async_rw), |
4017eb91 | 811 | .work_flags = IO_WQ_WORK_BLKCG | IO_WQ_WORK_MM, |
d3656344 | 812 | }, |
0463b6c5 | 813 | [IORING_OP_WRITE_FIXED] = { |
d3656344 JA |
814 | .needs_file = 1, |
815 | .hash_reg_file = 1, | |
816 | .unbound_nonreg_file = 1, | |
8a72758c | 817 | .pollout = 1, |
e8c2bc1f | 818 | .async_size = sizeof(struct io_async_rw), |
4017eb91 JA |
819 | .work_flags = IO_WQ_WORK_BLKCG | IO_WQ_WORK_FSIZE | |
820 | IO_WQ_WORK_MM, | |
d3656344 | 821 | }, |
0463b6c5 | 822 | [IORING_OP_POLL_ADD] = { |
d3656344 JA |
823 | .needs_file = 1, |
824 | .unbound_nonreg_file = 1, | |
825 | }, | |
0463b6c5 PB |
826 | [IORING_OP_POLL_REMOVE] = {}, |
827 | [IORING_OP_SYNC_FILE_RANGE] = { | |
d3656344 | 828 | .needs_file = 1, |
0f203765 | 829 | .work_flags = IO_WQ_WORK_BLKCG, |
d3656344 | 830 | }, |
0463b6c5 | 831 | [IORING_OP_SENDMSG] = { |
d3656344 JA |
832 | .needs_file = 1, |
833 | .unbound_nonreg_file = 1, | |
8a72758c | 834 | .pollout = 1, |
e8c2bc1f JA |
835 | .needs_async_data = 1, |
836 | .async_size = sizeof(struct io_async_msghdr), | |
0f203765 JA |
837 | .work_flags = IO_WQ_WORK_MM | IO_WQ_WORK_BLKCG | |
838 | IO_WQ_WORK_FS, | |
d3656344 | 839 | }, |
0463b6c5 | 840 | [IORING_OP_RECVMSG] = { |
d3656344 JA |
841 | .needs_file = 1, |
842 | .unbound_nonreg_file = 1, | |
8a72758c | 843 | .pollin = 1, |
52de1fe1 | 844 | .buffer_select = 1, |
e8c2bc1f JA |
845 | .needs_async_data = 1, |
846 | .async_size = sizeof(struct io_async_msghdr), | |
0f203765 JA |
847 | .work_flags = IO_WQ_WORK_MM | IO_WQ_WORK_BLKCG | |
848 | IO_WQ_WORK_FS, | |
d3656344 | 849 | }, |
0463b6c5 | 850 | [IORING_OP_TIMEOUT] = { |
e8c2bc1f JA |
851 | .needs_async_data = 1, |
852 | .async_size = sizeof(struct io_timeout_data), | |
0f203765 | 853 | .work_flags = IO_WQ_WORK_MM, |
d3656344 | 854 | }, |
0463b6c5 PB |
855 | [IORING_OP_TIMEOUT_REMOVE] = {}, |
856 | [IORING_OP_ACCEPT] = { | |
d3656344 JA |
857 | .needs_file = 1, |
858 | .unbound_nonreg_file = 1, | |
8a72758c | 859 | .pollin = 1, |
0f203765 | 860 | .work_flags = IO_WQ_WORK_MM | IO_WQ_WORK_FILES, |
d3656344 | 861 | }, |
0463b6c5 PB |
862 | [IORING_OP_ASYNC_CANCEL] = {}, |
863 | [IORING_OP_LINK_TIMEOUT] = { | |
e8c2bc1f JA |
864 | .needs_async_data = 1, |
865 | .async_size = sizeof(struct io_timeout_data), | |
0f203765 | 866 | .work_flags = IO_WQ_WORK_MM, |
d3656344 | 867 | }, |
0463b6c5 | 868 | [IORING_OP_CONNECT] = { |
d3656344 JA |
869 | .needs_file = 1, |
870 | .unbound_nonreg_file = 1, | |
8a72758c | 871 | .pollout = 1, |
e8c2bc1f JA |
872 | .needs_async_data = 1, |
873 | .async_size = sizeof(struct io_async_connect), | |
0f203765 | 874 | .work_flags = IO_WQ_WORK_MM, |
d3656344 | 875 | }, |
0463b6c5 | 876 | [IORING_OP_FALLOCATE] = { |
d3656344 | 877 | .needs_file = 1, |
69228338 | 878 | .work_flags = IO_WQ_WORK_BLKCG | IO_WQ_WORK_FSIZE, |
d3656344 | 879 | }, |
0463b6c5 | 880 | [IORING_OP_OPENAT] = { |
0f203765 | 881 | .work_flags = IO_WQ_WORK_FILES | IO_WQ_WORK_BLKCG | |
14587a46 | 882 | IO_WQ_WORK_FS | IO_WQ_WORK_MM, |
d3656344 | 883 | }, |
0463b6c5 | 884 | [IORING_OP_CLOSE] = { |
fd2206e4 JA |
885 | .needs_file = 1, |
886 | .needs_file_no_error = 1, | |
0f203765 | 887 | .work_flags = IO_WQ_WORK_FILES | IO_WQ_WORK_BLKCG, |
d3656344 | 888 | }, |
0463b6c5 | 889 | [IORING_OP_FILES_UPDATE] = { |
0f203765 | 890 | .work_flags = IO_WQ_WORK_FILES | IO_WQ_WORK_MM, |
d3656344 | 891 | }, |
0463b6c5 | 892 | [IORING_OP_STATX] = { |
0f203765 JA |
893 | .work_flags = IO_WQ_WORK_FILES | IO_WQ_WORK_MM | |
894 | IO_WQ_WORK_FS | IO_WQ_WORK_BLKCG, | |
d3656344 | 895 | }, |
0463b6c5 | 896 | [IORING_OP_READ] = { |
3a6820f2 JA |
897 | .needs_file = 1, |
898 | .unbound_nonreg_file = 1, | |
8a72758c | 899 | .pollin = 1, |
bcda7baa | 900 | .buffer_select = 1, |
e8c2bc1f | 901 | .async_size = sizeof(struct io_async_rw), |
0f203765 | 902 | .work_flags = IO_WQ_WORK_MM | IO_WQ_WORK_BLKCG, |
3a6820f2 | 903 | }, |
0463b6c5 | 904 | [IORING_OP_WRITE] = { |
3a6820f2 JA |
905 | .needs_file = 1, |
906 | .unbound_nonreg_file = 1, | |
8a72758c | 907 | .pollout = 1, |
e8c2bc1f | 908 | .async_size = sizeof(struct io_async_rw), |
69228338 JA |
909 | .work_flags = IO_WQ_WORK_MM | IO_WQ_WORK_BLKCG | |
910 | IO_WQ_WORK_FSIZE, | |
3a6820f2 | 911 | }, |
0463b6c5 | 912 | [IORING_OP_FADVISE] = { |
4840e418 | 913 | .needs_file = 1, |
0f203765 | 914 | .work_flags = IO_WQ_WORK_BLKCG, |
4840e418 | 915 | }, |
0463b6c5 | 916 | [IORING_OP_MADVISE] = { |
0f203765 | 917 | .work_flags = IO_WQ_WORK_MM | IO_WQ_WORK_BLKCG, |
c1ca757b | 918 | }, |
0463b6c5 | 919 | [IORING_OP_SEND] = { |
fddaface JA |
920 | .needs_file = 1, |
921 | .unbound_nonreg_file = 1, | |
8a72758c | 922 | .pollout = 1, |
0f203765 | 923 | .work_flags = IO_WQ_WORK_MM | IO_WQ_WORK_BLKCG, |
fddaface | 924 | }, |
0463b6c5 | 925 | [IORING_OP_RECV] = { |
fddaface JA |
926 | .needs_file = 1, |
927 | .unbound_nonreg_file = 1, | |
8a72758c | 928 | .pollin = 1, |
bcda7baa | 929 | .buffer_select = 1, |
0f203765 | 930 | .work_flags = IO_WQ_WORK_MM | IO_WQ_WORK_BLKCG, |
fddaface | 931 | }, |
0463b6c5 | 932 | [IORING_OP_OPENAT2] = { |
0f203765 | 933 | .work_flags = IO_WQ_WORK_FILES | IO_WQ_WORK_FS | |
14587a46 | 934 | IO_WQ_WORK_BLKCG | IO_WQ_WORK_MM, |
cebdb986 | 935 | }, |
3e4827b0 JA |
936 | [IORING_OP_EPOLL_CTL] = { |
937 | .unbound_nonreg_file = 1, | |
0f203765 | 938 | .work_flags = IO_WQ_WORK_FILES, |
3e4827b0 | 939 | }, |
7d67af2c PB |
940 | [IORING_OP_SPLICE] = { |
941 | .needs_file = 1, | |
942 | .hash_reg_file = 1, | |
943 | .unbound_nonreg_file = 1, | |
0f203765 | 944 | .work_flags = IO_WQ_WORK_BLKCG, |
ddf0322d JA |
945 | }, |
946 | [IORING_OP_PROVIDE_BUFFERS] = {}, | |
067524e9 | 947 | [IORING_OP_REMOVE_BUFFERS] = {}, |
f2a8d5c7 PB |
948 | [IORING_OP_TEE] = { |
949 | .needs_file = 1, | |
950 | .hash_reg_file = 1, | |
951 | .unbound_nonreg_file = 1, | |
952 | }, | |
36f4fa68 JA |
953 | [IORING_OP_SHUTDOWN] = { |
954 | .needs_file = 1, | |
955 | }, | |
80a261fd JA |
956 | [IORING_OP_RENAMEAT] = { |
957 | .work_flags = IO_WQ_WORK_MM | IO_WQ_WORK_FILES | | |
958 | IO_WQ_WORK_FS | IO_WQ_WORK_BLKCG, | |
959 | }, | |
d3656344 JA |
960 | }; |
961 | ||
2e0464d4 BM |
962 | enum io_mem_account { |
963 | ACCT_LOCKED, | |
964 | ACCT_PINNED, | |
965 | }; | |
966 | ||
81b68a5c PB |
967 | static void __io_complete_rw(struct io_kiocb *req, long res, long res2, |
968 | struct io_comp_state *cs); | |
78e19bbe | 969 | static void io_cqring_fill_event(struct io_kiocb *req, long res); |
ec9c02ad | 970 | static void io_put_req(struct io_kiocb *req); |
216578e5 | 971 | static void io_put_req_deferred(struct io_kiocb *req, int nr); |
c40f6379 | 972 | static void io_double_put_req(struct io_kiocb *req); |
94ae5e77 | 973 | static struct io_kiocb *io_prep_linked_timeout(struct io_kiocb *req); |
7271ef3a | 974 | static void __io_queue_linked_timeout(struct io_kiocb *req); |
94ae5e77 | 975 | static void io_queue_linked_timeout(struct io_kiocb *req); |
05f3fb3c JA |
976 | static int __io_sqe_files_update(struct io_ring_ctx *ctx, |
977 | struct io_uring_files_update *ip, | |
978 | unsigned nr_args); | |
3ca405eb | 979 | static void __io_clean_op(struct io_kiocb *req); |
8371adf5 PB |
980 | static struct file *io_file_get(struct io_submit_state *state, |
981 | struct io_kiocb *req, int fd, bool fixed); | |
c1379e24 | 982 | static void __io_queue_sqe(struct io_kiocb *req, struct io_comp_state *cs); |
4349f30e | 983 | static void io_file_put_work(struct work_struct *work); |
de0617e4 | 984 | |
b63534c4 JA |
985 | static ssize_t io_import_iovec(int rw, struct io_kiocb *req, |
986 | struct iovec **iovec, struct iov_iter *iter, | |
987 | bool needs_lock); | |
ff6165b2 JA |
988 | static int io_setup_async_rw(struct io_kiocb *req, const struct iovec *iovec, |
989 | const struct iovec *fast_iov, | |
227c0c96 | 990 | struct iov_iter *iter, bool force); |
de0617e4 | 991 | |
2b188cc1 JA |
992 | static struct kmem_cache *req_cachep; |
993 | ||
0918682b | 994 | static const struct file_operations io_uring_fops; |
2b188cc1 JA |
995 | |
996 | struct sock *io_uring_get_socket(struct file *file) | |
997 | { | |
998 | #if defined(CONFIG_UNIX) | |
999 | if (file->f_op == &io_uring_fops) { | |
1000 | struct io_ring_ctx *ctx = file->private_data; | |
1001 | ||
1002 | return ctx->ring_sock->sk; | |
1003 | } | |
1004 | #endif | |
1005 | return NULL; | |
1006 | } | |
1007 | EXPORT_SYMBOL(io_uring_get_socket); | |
1008 | ||
3ca405eb PB |
1009 | static inline void io_clean_op(struct io_kiocb *req) |
1010 | { | |
bb175342 PB |
1011 | if (req->flags & (REQ_F_NEED_CLEANUP | REQ_F_BUFFER_SELECTED | |
1012 | REQ_F_INFLIGHT)) | |
3ca405eb PB |
1013 | __io_clean_op(req); |
1014 | } | |
1015 | ||
28cea78a | 1016 | static void io_sq_thread_drop_mm_files(void) |
c40f6379 | 1017 | { |
28cea78a | 1018 | struct files_struct *files = current->files; |
c40f6379 JA |
1019 | struct mm_struct *mm = current->mm; |
1020 | ||
1021 | if (mm) { | |
1022 | kthread_unuse_mm(mm); | |
1023 | mmput(mm); | |
4b70cf9d | 1024 | current->mm = NULL; |
c40f6379 | 1025 | } |
28cea78a JA |
1026 | if (files) { |
1027 | struct nsproxy *nsproxy = current->nsproxy; | |
1028 | ||
1029 | task_lock(current); | |
1030 | current->files = NULL; | |
1031 | current->nsproxy = NULL; | |
1032 | task_unlock(current); | |
1033 | put_files_struct(files); | |
1034 | put_nsproxy(nsproxy); | |
1035 | } | |
1036 | } | |
1037 | ||
1038 | static void __io_sq_thread_acquire_files(struct io_ring_ctx *ctx) | |
1039 | { | |
1040 | if (!current->files) { | |
1041 | struct files_struct *files; | |
1042 | struct nsproxy *nsproxy; | |
1043 | ||
1044 | task_lock(ctx->sqo_task); | |
1045 | files = ctx->sqo_task->files; | |
1046 | if (!files) { | |
1047 | task_unlock(ctx->sqo_task); | |
1048 | return; | |
1049 | } | |
1050 | atomic_inc(&files->count); | |
1051 | get_nsproxy(ctx->sqo_task->nsproxy); | |
1052 | nsproxy = ctx->sqo_task->nsproxy; | |
1053 | task_unlock(ctx->sqo_task); | |
1054 | ||
1055 | task_lock(current); | |
1056 | current->files = files; | |
1057 | current->nsproxy = nsproxy; | |
1058 | task_unlock(current); | |
1059 | } | |
c40f6379 JA |
1060 | } |
1061 | ||
1062 | static int __io_sq_thread_acquire_mm(struct io_ring_ctx *ctx) | |
1063 | { | |
4b70cf9d JA |
1064 | struct mm_struct *mm; |
1065 | ||
1066 | if (current->mm) | |
1067 | return 0; | |
1068 | ||
1069 | /* Should never happen */ | |
1070 | if (unlikely(!(ctx->flags & IORING_SETUP_SQPOLL))) | |
1071 | return -EFAULT; | |
1072 | ||
1073 | task_lock(ctx->sqo_task); | |
1074 | mm = ctx->sqo_task->mm; | |
1075 | if (unlikely(!mm || !mmget_not_zero(mm))) | |
1076 | mm = NULL; | |
1077 | task_unlock(ctx->sqo_task); | |
1078 | ||
1079 | if (mm) { | |
1080 | kthread_use_mm(mm); | |
1081 | return 0; | |
c40f6379 JA |
1082 | } |
1083 | ||
4b70cf9d | 1084 | return -EFAULT; |
c40f6379 JA |
1085 | } |
1086 | ||
28cea78a JA |
1087 | static int io_sq_thread_acquire_mm_files(struct io_ring_ctx *ctx, |
1088 | struct io_kiocb *req) | |
c40f6379 | 1089 | { |
28cea78a JA |
1090 | const struct io_op_def *def = &io_op_defs[req->opcode]; |
1091 | ||
1092 | if (def->work_flags & IO_WQ_WORK_MM) { | |
1093 | int ret = __io_sq_thread_acquire_mm(ctx); | |
1094 | if (unlikely(ret)) | |
1095 | return ret; | |
1096 | } | |
1097 | ||
1098 | if (def->needs_file || (def->work_flags & IO_WQ_WORK_FILES)) | |
1099 | __io_sq_thread_acquire_files(ctx); | |
1100 | ||
1101 | return 0; | |
c40f6379 JA |
1102 | } |
1103 | ||
91d8f519 DZ |
1104 | static void io_sq_thread_associate_blkcg(struct io_ring_ctx *ctx, |
1105 | struct cgroup_subsys_state **cur_css) | |
1106 | ||
1107 | { | |
1108 | #ifdef CONFIG_BLK_CGROUP | |
1109 | /* puts the old one when swapping */ | |
1110 | if (*cur_css != ctx->sqo_blkcg_css) { | |
1111 | kthread_associate_blkcg(ctx->sqo_blkcg_css); | |
1112 | *cur_css = ctx->sqo_blkcg_css; | |
1113 | } | |
1114 | #endif | |
1115 | } | |
1116 | ||
1117 | static void io_sq_thread_unassociate_blkcg(void) | |
1118 | { | |
1119 | #ifdef CONFIG_BLK_CGROUP | |
1120 | kthread_associate_blkcg(NULL); | |
1121 | #endif | |
1122 | } | |
1123 | ||
c40f6379 JA |
1124 | static inline void req_set_fail_links(struct io_kiocb *req) |
1125 | { | |
1126 | if ((req->flags & (REQ_F_LINK | REQ_F_HARDLINK)) == REQ_F_LINK) | |
1127 | req->flags |= REQ_F_FAIL_LINK; | |
1128 | } | |
4a38aed2 | 1129 | |
1e6fa521 JA |
1130 | /* |
1131 | * None of these are dereferenced, they are simply used to check if any of | |
1132 | * them have changed. If we're under current and check they are still the | |
1133 | * same, we're fine to grab references to them for actual out-of-line use. | |
1134 | */ | |
1135 | static void io_init_identity(struct io_identity *id) | |
1136 | { | |
1137 | id->files = current->files; | |
1138 | id->mm = current->mm; | |
1139 | #ifdef CONFIG_BLK_CGROUP | |
1140 | rcu_read_lock(); | |
1141 | id->blkcg_css = blkcg_css(); | |
1142 | rcu_read_unlock(); | |
1143 | #endif | |
1144 | id->creds = current_cred(); | |
1145 | id->nsproxy = current->nsproxy; | |
1146 | id->fs = current->fs; | |
1147 | id->fsize = rlimit(RLIMIT_FSIZE); | |
4ea33a97 JA |
1148 | #ifdef CONFIG_AUDIT |
1149 | id->loginuid = current->loginuid; | |
1150 | id->sessionid = current->sessionid; | |
1151 | #endif | |
1e6fa521 JA |
1152 | refcount_set(&id->count, 1); |
1153 | } | |
1154 | ||
ec99ca6c PB |
1155 | static inline void __io_req_init_async(struct io_kiocb *req) |
1156 | { | |
1157 | memset(&req->work, 0, sizeof(req->work)); | |
1158 | req->flags |= REQ_F_WORK_INITIALIZED; | |
1159 | } | |
1160 | ||
7cdaf587 XW |
1161 | /* |
1162 | * Note: must call io_req_init_async() for the first time you | |
1163 | * touch any members of io_wq_work. | |
1164 | */ | |
1165 | static inline void io_req_init_async(struct io_kiocb *req) | |
1166 | { | |
500a373d JA |
1167 | struct io_uring_task *tctx = current->io_uring; |
1168 | ||
7cdaf587 XW |
1169 | if (req->flags & REQ_F_WORK_INITIALIZED) |
1170 | return; | |
1171 | ||
ec99ca6c | 1172 | __io_req_init_async(req); |
500a373d JA |
1173 | |
1174 | /* Grab a ref if this isn't our static identity */ | |
1175 | req->work.identity = tctx->identity; | |
1176 | if (tctx->identity != &tctx->__identity) | |
1177 | refcount_inc(&req->work.identity->count); | |
7cdaf587 XW |
1178 | } |
1179 | ||
0cdaf760 PB |
1180 | static inline bool io_async_submit(struct io_ring_ctx *ctx) |
1181 | { | |
1182 | return ctx->flags & IORING_SETUP_SQPOLL; | |
1183 | } | |
1184 | ||
2b188cc1 JA |
1185 | static void io_ring_ctx_ref_free(struct percpu_ref *ref) |
1186 | { | |
1187 | struct io_ring_ctx *ctx = container_of(ref, struct io_ring_ctx, refs); | |
1188 | ||
0f158b4c | 1189 | complete(&ctx->ref_comp); |
2b188cc1 JA |
1190 | } |
1191 | ||
8eb7e2d0 PB |
1192 | static inline bool io_is_timeout_noseq(struct io_kiocb *req) |
1193 | { | |
1194 | return !req->timeout.off; | |
1195 | } | |
1196 | ||
2b188cc1 JA |
1197 | static struct io_ring_ctx *io_ring_ctx_alloc(struct io_uring_params *p) |
1198 | { | |
1199 | struct io_ring_ctx *ctx; | |
78076bb6 | 1200 | int hash_bits; |
2b188cc1 JA |
1201 | |
1202 | ctx = kzalloc(sizeof(*ctx), GFP_KERNEL); | |
1203 | if (!ctx) | |
1204 | return NULL; | |
1205 | ||
0ddf92e8 JA |
1206 | ctx->fallback_req = kmem_cache_alloc(req_cachep, GFP_KERNEL); |
1207 | if (!ctx->fallback_req) | |
1208 | goto err; | |
1209 | ||
78076bb6 JA |
1210 | /* |
1211 | * Use 5 bits less than the max cq entries, that should give us around | |
1212 | * 32 entries per hash list if totally full and uniformly spread. | |
1213 | */ | |
1214 | hash_bits = ilog2(p->cq_entries); | |
1215 | hash_bits -= 5; | |
1216 | if (hash_bits <= 0) | |
1217 | hash_bits = 1; | |
1218 | ctx->cancel_hash_bits = hash_bits; | |
1219 | ctx->cancel_hash = kmalloc((1U << hash_bits) * sizeof(struct hlist_head), | |
1220 | GFP_KERNEL); | |
1221 | if (!ctx->cancel_hash) | |
1222 | goto err; | |
1223 | __hash_init(ctx->cancel_hash, 1U << hash_bits); | |
1224 | ||
21482896 | 1225 | if (percpu_ref_init(&ctx->refs, io_ring_ctx_ref_free, |
206aefde JA |
1226 | PERCPU_REF_ALLOW_REINIT, GFP_KERNEL)) |
1227 | goto err; | |
2b188cc1 JA |
1228 | |
1229 | ctx->flags = p->flags; | |
90554200 | 1230 | init_waitqueue_head(&ctx->sqo_sq_wait); |
69fb2131 | 1231 | INIT_LIST_HEAD(&ctx->sqd_list); |
2b188cc1 | 1232 | init_waitqueue_head(&ctx->cq_wait); |
1d7bb1d5 | 1233 | INIT_LIST_HEAD(&ctx->cq_overflow_list); |
0f158b4c JA |
1234 | init_completion(&ctx->ref_comp); |
1235 | init_completion(&ctx->sq_thread_comp); | |
5a2e745d | 1236 | idr_init(&ctx->io_buffer_idr); |
071698e1 | 1237 | idr_init(&ctx->personality_idr); |
2b188cc1 JA |
1238 | mutex_init(&ctx->uring_lock); |
1239 | init_waitqueue_head(&ctx->wait); | |
1240 | spin_lock_init(&ctx->completion_lock); | |
540e32a0 | 1241 | INIT_LIST_HEAD(&ctx->iopoll_list); |
de0617e4 | 1242 | INIT_LIST_HEAD(&ctx->defer_list); |
5262f567 | 1243 | INIT_LIST_HEAD(&ctx->timeout_list); |
fcb323cc JA |
1244 | init_waitqueue_head(&ctx->inflight_wait); |
1245 | spin_lock_init(&ctx->inflight_lock); | |
1246 | INIT_LIST_HEAD(&ctx->inflight_list); | |
4a38aed2 JA |
1247 | INIT_DELAYED_WORK(&ctx->file_put_work, io_file_put_work); |
1248 | init_llist_head(&ctx->file_put_llist); | |
2b188cc1 | 1249 | return ctx; |
206aefde | 1250 | err: |
0ddf92e8 JA |
1251 | if (ctx->fallback_req) |
1252 | kmem_cache_free(req_cachep, ctx->fallback_req); | |
78076bb6 | 1253 | kfree(ctx->cancel_hash); |
206aefde JA |
1254 | kfree(ctx); |
1255 | return NULL; | |
2b188cc1 JA |
1256 | } |
1257 | ||
9cf7c104 | 1258 | static bool req_need_defer(struct io_kiocb *req, u32 seq) |
7adf4eaf | 1259 | { |
2bc9930e JA |
1260 | if (unlikely(req->flags & REQ_F_IO_DRAIN)) { |
1261 | struct io_ring_ctx *ctx = req->ctx; | |
a197f664 | 1262 | |
9cf7c104 | 1263 | return seq != ctx->cached_cq_tail |
2c3bac6d | 1264 | + READ_ONCE(ctx->cached_cq_overflow); |
2bc9930e | 1265 | } |
de0617e4 | 1266 | |
9d858b21 | 1267 | return false; |
de0617e4 JA |
1268 | } |
1269 | ||
de0617e4 | 1270 | static void __io_commit_cqring(struct io_ring_ctx *ctx) |
2b188cc1 | 1271 | { |
75b28aff | 1272 | struct io_rings *rings = ctx->rings; |
2b188cc1 | 1273 | |
07910158 PB |
1274 | /* order cqe stores with ring update */ |
1275 | smp_store_release(&rings->cq.tail, ctx->cached_cq_tail); | |
2b188cc1 | 1276 | |
07910158 PB |
1277 | if (wq_has_sleeper(&ctx->cq_wait)) { |
1278 | wake_up_interruptible(&ctx->cq_wait); | |
1279 | kill_fasync(&ctx->cq_fasync, SIGIO, POLL_IN); | |
2b188cc1 JA |
1280 | } |
1281 | } | |
1282 | ||
5c3462cf | 1283 | static void io_put_identity(struct io_uring_task *tctx, struct io_kiocb *req) |
1e6fa521 | 1284 | { |
500a373d | 1285 | if (req->work.identity == &tctx->__identity) |
1e6fa521 JA |
1286 | return; |
1287 | if (refcount_dec_and_test(&req->work.identity->count)) | |
1288 | kfree(req->work.identity); | |
1289 | } | |
1290 | ||
4edf20f9 | 1291 | static void io_req_clean_work(struct io_kiocb *req) |
18d9be1a | 1292 | { |
7cdaf587 | 1293 | if (!(req->flags & REQ_F_WORK_INITIALIZED)) |
4edf20f9 | 1294 | return; |
51a4cc11 JA |
1295 | |
1296 | req->flags &= ~REQ_F_WORK_INITIALIZED; | |
7cdaf587 | 1297 | |
dfead8a8 | 1298 | if (req->work.flags & IO_WQ_WORK_MM) { |
98447d65 | 1299 | mmdrop(req->work.identity->mm); |
dfead8a8 | 1300 | req->work.flags &= ~IO_WQ_WORK_MM; |
cccf0ee8 | 1301 | } |
91d8f519 | 1302 | #ifdef CONFIG_BLK_CGROUP |
dfead8a8 | 1303 | if (req->work.flags & IO_WQ_WORK_BLKCG) { |
98447d65 | 1304 | css_put(req->work.identity->blkcg_css); |
dfead8a8 JA |
1305 | req->work.flags &= ~IO_WQ_WORK_BLKCG; |
1306 | } | |
91d8f519 | 1307 | #endif |
dfead8a8 | 1308 | if (req->work.flags & IO_WQ_WORK_CREDS) { |
98447d65 | 1309 | put_cred(req->work.identity->creds); |
dfead8a8 | 1310 | req->work.flags &= ~IO_WQ_WORK_CREDS; |
cccf0ee8 | 1311 | } |
dfead8a8 | 1312 | if (req->work.flags & IO_WQ_WORK_FS) { |
98447d65 | 1313 | struct fs_struct *fs = req->work.identity->fs; |
51a4cc11 | 1314 | |
98447d65 | 1315 | spin_lock(&req->work.identity->fs->lock); |
ff002b30 JA |
1316 | if (--fs->users) |
1317 | fs = NULL; | |
98447d65 | 1318 | spin_unlock(&req->work.identity->fs->lock); |
ff002b30 JA |
1319 | if (fs) |
1320 | free_fs_struct(fs); | |
dfead8a8 | 1321 | req->work.flags &= ~IO_WQ_WORK_FS; |
ff002b30 | 1322 | } |
51a4cc11 | 1323 | |
5c3462cf | 1324 | io_put_identity(req->task->io_uring, req); |
561fb04a JA |
1325 | } |
1326 | ||
1e6fa521 JA |
1327 | /* |
1328 | * Create a private copy of io_identity, since some fields don't match | |
1329 | * the current context. | |
1330 | */ | |
1331 | static bool io_identity_cow(struct io_kiocb *req) | |
1332 | { | |
5c3462cf | 1333 | struct io_uring_task *tctx = current->io_uring; |
1e6fa521 JA |
1334 | const struct cred *creds = NULL; |
1335 | struct io_identity *id; | |
1336 | ||
1337 | if (req->work.flags & IO_WQ_WORK_CREDS) | |
1338 | creds = req->work.identity->creds; | |
1339 | ||
1340 | id = kmemdup(req->work.identity, sizeof(*id), GFP_KERNEL); | |
1341 | if (unlikely(!id)) { | |
1342 | req->work.flags |= IO_WQ_WORK_CANCEL; | |
1343 | return false; | |
1344 | } | |
1345 | ||
1346 | /* | |
1347 | * We can safely just re-init the creds we copied Either the field | |
1348 | * matches the current one, or we haven't grabbed it yet. The only | |
1349 | * exception is ->creds, through registered personalities, so handle | |
1350 | * that one separately. | |
1351 | */ | |
1352 | io_init_identity(id); | |
1353 | if (creds) | |
1354 | req->work.identity->creds = creds; | |
1355 | ||
1356 | /* add one for this request */ | |
1357 | refcount_inc(&id->count); | |
1358 | ||
cb8a8ae3 JA |
1359 | /* drop tctx and req identity references, if needed */ |
1360 | if (tctx->identity != &tctx->__identity && | |
1361 | refcount_dec_and_test(&tctx->identity->count)) | |
1362 | kfree(tctx->identity); | |
1363 | if (req->work.identity != &tctx->__identity && | |
1364 | refcount_dec_and_test(&req->work.identity->count)) | |
1e6fa521 JA |
1365 | kfree(req->work.identity); |
1366 | ||
1367 | req->work.identity = id; | |
500a373d | 1368 | tctx->identity = id; |
1e6fa521 JA |
1369 | return true; |
1370 | } | |
1371 | ||
1372 | static bool io_grab_identity(struct io_kiocb *req) | |
18d9be1a | 1373 | { |
d3656344 | 1374 | const struct io_op_def *def = &io_op_defs[req->opcode]; |
5c3462cf | 1375 | struct io_identity *id = req->work.identity; |
23329513 | 1376 | struct io_ring_ctx *ctx = req->ctx; |
54a91f3b | 1377 | |
69228338 JA |
1378 | if (def->work_flags & IO_WQ_WORK_FSIZE) { |
1379 | if (id->fsize != rlimit(RLIMIT_FSIZE)) | |
1380 | return false; | |
1381 | req->work.flags |= IO_WQ_WORK_FSIZE; | |
1382 | } | |
16d59803 | 1383 | |
dfead8a8 | 1384 | if (!(req->work.flags & IO_WQ_WORK_FILES) && |
1e6fa521 | 1385 | (def->work_flags & IO_WQ_WORK_FILES) && |
23329513 | 1386 | !(req->flags & REQ_F_NO_FILE_TABLE)) { |
1e6fa521 JA |
1387 | if (id->files != current->files || |
1388 | id->nsproxy != current->nsproxy) | |
1389 | return false; | |
1390 | atomic_inc(&id->files->count); | |
1391 | get_nsproxy(id->nsproxy); | |
23329513 PB |
1392 | req->flags |= REQ_F_INFLIGHT; |
1393 | ||
1394 | spin_lock_irq(&ctx->inflight_lock); | |
1395 | list_add(&req->inflight_entry, &ctx->inflight_list); | |
1396 | spin_unlock_irq(&ctx->inflight_lock); | |
dfead8a8 | 1397 | req->work.flags |= IO_WQ_WORK_FILES; |
dca9cf8b | 1398 | } |
91d8f519 | 1399 | #ifdef CONFIG_BLK_CGROUP |
dfead8a8 JA |
1400 | if (!(req->work.flags & IO_WQ_WORK_BLKCG) && |
1401 | (def->work_flags & IO_WQ_WORK_BLKCG)) { | |
91d8f519 | 1402 | rcu_read_lock(); |
1e6fa521 JA |
1403 | if (id->blkcg_css != blkcg_css()) { |
1404 | rcu_read_unlock(); | |
1405 | return false; | |
1406 | } | |
91d8f519 DZ |
1407 | /* |
1408 | * This should be rare, either the cgroup is dying or the task | |
1409 | * is moving cgroups. Just punt to root for the handful of ios. | |
1410 | */ | |
1e6fa521 | 1411 | if (css_tryget_online(id->blkcg_css)) |
dfead8a8 | 1412 | req->work.flags |= IO_WQ_WORK_BLKCG; |
91d8f519 DZ |
1413 | rcu_read_unlock(); |
1414 | } | |
1415 | #endif | |
dfead8a8 | 1416 | if (!(req->work.flags & IO_WQ_WORK_CREDS)) { |
1e6fa521 JA |
1417 | if (id->creds != current_cred()) |
1418 | return false; | |
1419 | get_cred(id->creds); | |
dfead8a8 JA |
1420 | req->work.flags |= IO_WQ_WORK_CREDS; |
1421 | } | |
4ea33a97 JA |
1422 | #ifdef CONFIG_AUDIT |
1423 | if (!uid_eq(current->loginuid, id->loginuid) || | |
1424 | current->sessionid != id->sessionid) | |
1425 | return false; | |
1426 | #endif | |
dfead8a8 JA |
1427 | if (!(req->work.flags & IO_WQ_WORK_FS) && |
1428 | (def->work_flags & IO_WQ_WORK_FS)) { | |
1e6fa521 JA |
1429 | if (current->fs != id->fs) |
1430 | return false; | |
1431 | spin_lock(&id->fs->lock); | |
1432 | if (!id->fs->in_exec) { | |
1433 | id->fs->users++; | |
dfead8a8 | 1434 | req->work.flags |= IO_WQ_WORK_FS; |
dca9cf8b PB |
1435 | } else { |
1436 | req->work.flags |= IO_WQ_WORK_CANCEL; | |
1437 | } | |
1438 | spin_unlock(¤t->fs->lock); | |
1439 | } | |
1e6fa521 JA |
1440 | |
1441 | return true; | |
1442 | } | |
1443 | ||
1444 | static void io_prep_async_work(struct io_kiocb *req) | |
1445 | { | |
1446 | const struct io_op_def *def = &io_op_defs[req->opcode]; | |
1e6fa521 | 1447 | struct io_ring_ctx *ctx = req->ctx; |
5c3462cf | 1448 | struct io_identity *id; |
1e6fa521 JA |
1449 | |
1450 | io_req_init_async(req); | |
5c3462cf | 1451 | id = req->work.identity; |
1e6fa521 | 1452 | |
feaadc4f PB |
1453 | if (req->flags & REQ_F_FORCE_ASYNC) |
1454 | req->work.flags |= IO_WQ_WORK_CONCURRENT; | |
1455 | ||
1e6fa521 JA |
1456 | if (req->flags & REQ_F_ISREG) { |
1457 | if (def->hash_reg_file || (ctx->flags & IORING_SETUP_IOPOLL)) | |
1458 | io_wq_hash_work(&req->work, file_inode(req->file)); | |
1459 | } else { | |
1460 | if (def->unbound_nonreg_file) | |
1461 | req->work.flags |= IO_WQ_WORK_UNBOUND; | |
1462 | } | |
1463 | ||
1464 | /* ->mm can never change on us */ | |
1465 | if (!(req->work.flags & IO_WQ_WORK_MM) && | |
1466 | (def->work_flags & IO_WQ_WORK_MM)) { | |
1467 | mmgrab(id->mm); | |
1468 | req->work.flags |= IO_WQ_WORK_MM; | |
1469 | } | |
1470 | ||
1471 | /* if we fail grabbing identity, we must COW, regrab, and retry */ | |
1472 | if (io_grab_identity(req)) | |
1473 | return; | |
1474 | ||
1475 | if (!io_identity_cow(req)) | |
1476 | return; | |
1477 | ||
1478 | /* can't fail at this point */ | |
1479 | if (!io_grab_identity(req)) | |
1480 | WARN_ON(1); | |
561fb04a | 1481 | } |
cccf0ee8 | 1482 | |
cbdcb435 | 1483 | static void io_prep_async_link(struct io_kiocb *req) |
561fb04a | 1484 | { |
cbdcb435 | 1485 | struct io_kiocb *cur; |
54a91f3b | 1486 | |
cbdcb435 PB |
1487 | io_prep_async_work(req); |
1488 | if (req->flags & REQ_F_LINK_HEAD) | |
1489 | list_for_each_entry(cur, &req->link_list, link_list) | |
1490 | io_prep_async_work(cur); | |
561fb04a JA |
1491 | } |
1492 | ||
7271ef3a | 1493 | static struct io_kiocb *__io_queue_async_work(struct io_kiocb *req) |
561fb04a | 1494 | { |
a197f664 | 1495 | struct io_ring_ctx *ctx = req->ctx; |
cbdcb435 | 1496 | struct io_kiocb *link = io_prep_linked_timeout(req); |
561fb04a | 1497 | |
8766dd51 PB |
1498 | trace_io_uring_queue_async_work(ctx, io_wq_is_hashed(&req->work), req, |
1499 | &req->work, req->flags); | |
1500 | io_wq_enqueue(ctx->io_wq, &req->work); | |
7271ef3a | 1501 | return link; |
18d9be1a JA |
1502 | } |
1503 | ||
cbdcb435 PB |
1504 | static void io_queue_async_work(struct io_kiocb *req) |
1505 | { | |
7271ef3a JA |
1506 | struct io_kiocb *link; |
1507 | ||
cbdcb435 PB |
1508 | /* init ->work of the whole link before punting */ |
1509 | io_prep_async_link(req); | |
7271ef3a JA |
1510 | link = __io_queue_async_work(req); |
1511 | ||
1512 | if (link) | |
1513 | io_queue_linked_timeout(link); | |
cbdcb435 PB |
1514 | } |
1515 | ||
5262f567 JA |
1516 | static void io_kill_timeout(struct io_kiocb *req) |
1517 | { | |
e8c2bc1f | 1518 | struct io_timeout_data *io = req->async_data; |
5262f567 JA |
1519 | int ret; |
1520 | ||
e8c2bc1f | 1521 | ret = hrtimer_try_to_cancel(&io->timer); |
5262f567 | 1522 | if (ret != -1) { |
01cec8c1 PB |
1523 | atomic_set(&req->ctx->cq_timeouts, |
1524 | atomic_read(&req->ctx->cq_timeouts) + 1); | |
135fcde8 | 1525 | list_del_init(&req->timeout.list); |
78e19bbe | 1526 | io_cqring_fill_event(req, 0); |
216578e5 | 1527 | io_put_req_deferred(req, 1); |
5262f567 JA |
1528 | } |
1529 | } | |
1530 | ||
f3606e3a JA |
1531 | static bool io_task_match(struct io_kiocb *req, struct task_struct *tsk) |
1532 | { | |
1533 | struct io_ring_ctx *ctx = req->ctx; | |
1534 | ||
1535 | if (!tsk || req->task == tsk) | |
1536 | return true; | |
534ca6d6 JA |
1537 | if (ctx->flags & IORING_SETUP_SQPOLL) { |
1538 | if (ctx->sq_data && req->task == ctx->sq_data->thread) | |
1539 | return true; | |
1540 | } | |
f3606e3a JA |
1541 | return false; |
1542 | } | |
1543 | ||
76e1b642 JA |
1544 | /* |
1545 | * Returns true if we found and killed one or more timeouts | |
1546 | */ | |
1547 | static bool io_kill_timeouts(struct io_ring_ctx *ctx, struct task_struct *tsk) | |
5262f567 JA |
1548 | { |
1549 | struct io_kiocb *req, *tmp; | |
76e1b642 | 1550 | int canceled = 0; |
5262f567 JA |
1551 | |
1552 | spin_lock_irq(&ctx->completion_lock); | |
f3606e3a | 1553 | list_for_each_entry_safe(req, tmp, &ctx->timeout_list, timeout.list) { |
76e1b642 | 1554 | if (io_task_match(req, tsk)) { |
f3606e3a | 1555 | io_kill_timeout(req); |
76e1b642 JA |
1556 | canceled++; |
1557 | } | |
f3606e3a | 1558 | } |
5262f567 | 1559 | spin_unlock_irq(&ctx->completion_lock); |
76e1b642 | 1560 | return canceled != 0; |
5262f567 JA |
1561 | } |
1562 | ||
04518945 | 1563 | static void __io_queue_deferred(struct io_ring_ctx *ctx) |
de0617e4 | 1564 | { |
04518945 | 1565 | do { |
27dc8338 PB |
1566 | struct io_defer_entry *de = list_first_entry(&ctx->defer_list, |
1567 | struct io_defer_entry, list); | |
7271ef3a | 1568 | struct io_kiocb *link; |
de0617e4 | 1569 | |
9cf7c104 | 1570 | if (req_need_defer(de->req, de->seq)) |
04518945 | 1571 | break; |
27dc8338 | 1572 | list_del_init(&de->list); |
cbdcb435 | 1573 | /* punt-init is done before queueing for defer */ |
7271ef3a JA |
1574 | link = __io_queue_async_work(de->req); |
1575 | if (link) { | |
1576 | __io_queue_linked_timeout(link); | |
1577 | /* drop submission reference */ | |
216578e5 | 1578 | io_put_req_deferred(link, 1); |
7271ef3a | 1579 | } |
27dc8338 | 1580 | kfree(de); |
04518945 PB |
1581 | } while (!list_empty(&ctx->defer_list)); |
1582 | } | |
1583 | ||
360428f8 | 1584 | static void io_flush_timeouts(struct io_ring_ctx *ctx) |
de0617e4 | 1585 | { |
360428f8 PB |
1586 | while (!list_empty(&ctx->timeout_list)) { |
1587 | struct io_kiocb *req = list_first_entry(&ctx->timeout_list, | |
135fcde8 | 1588 | struct io_kiocb, timeout.list); |
de0617e4 | 1589 | |
8eb7e2d0 | 1590 | if (io_is_timeout_noseq(req)) |
360428f8 | 1591 | break; |
bfe68a22 PB |
1592 | if (req->timeout.target_seq != ctx->cached_cq_tail |
1593 | - atomic_read(&ctx->cq_timeouts)) | |
360428f8 | 1594 | break; |
bfe68a22 | 1595 | |
135fcde8 | 1596 | list_del_init(&req->timeout.list); |
5262f567 | 1597 | io_kill_timeout(req); |
360428f8 PB |
1598 | } |
1599 | } | |
5262f567 | 1600 | |
360428f8 PB |
1601 | static void io_commit_cqring(struct io_ring_ctx *ctx) |
1602 | { | |
1603 | io_flush_timeouts(ctx); | |
de0617e4 JA |
1604 | __io_commit_cqring(ctx); |
1605 | ||
04518945 PB |
1606 | if (unlikely(!list_empty(&ctx->defer_list))) |
1607 | __io_queue_deferred(ctx); | |
de0617e4 JA |
1608 | } |
1609 | ||
90554200 JA |
1610 | static inline bool io_sqring_full(struct io_ring_ctx *ctx) |
1611 | { | |
1612 | struct io_rings *r = ctx->rings; | |
1613 | ||
1614 | return READ_ONCE(r->sq.tail) - ctx->cached_sq_head == r->sq_ring_entries; | |
1615 | } | |
1616 | ||
2b188cc1 JA |
1617 | static struct io_uring_cqe *io_get_cqring(struct io_ring_ctx *ctx) |
1618 | { | |
75b28aff | 1619 | struct io_rings *rings = ctx->rings; |
2b188cc1 JA |
1620 | unsigned tail; |
1621 | ||
1622 | tail = ctx->cached_cq_tail; | |
115e12e5 SB |
1623 | /* |
1624 | * writes to the cq entry need to come after reading head; the | |
1625 | * control dependency is enough as we're using WRITE_ONCE to | |
1626 | * fill the cq entry | |
1627 | */ | |
75b28aff | 1628 | if (tail - READ_ONCE(rings->cq.head) == rings->cq_ring_entries) |
2b188cc1 JA |
1629 | return NULL; |
1630 | ||
1631 | ctx->cached_cq_tail++; | |
75b28aff | 1632 | return &rings->cqes[tail & ctx->cq_mask]; |
2b188cc1 JA |
1633 | } |
1634 | ||
f2842ab5 JA |
1635 | static inline bool io_should_trigger_evfd(struct io_ring_ctx *ctx) |
1636 | { | |
f0b493e6 JA |
1637 | if (!ctx->cq_ev_fd) |
1638 | return false; | |
7e55a19c SG |
1639 | if (READ_ONCE(ctx->rings->cq_flags) & IORING_CQ_EVENTFD_DISABLED) |
1640 | return false; | |
f2842ab5 JA |
1641 | if (!ctx->eventfd_async) |
1642 | return true; | |
b41e9852 | 1643 | return io_wq_current_is_worker(); |
f2842ab5 JA |
1644 | } |
1645 | ||
b41e9852 | 1646 | static void io_cqring_ev_posted(struct io_ring_ctx *ctx) |
1d7bb1d5 JA |
1647 | { |
1648 | if (waitqueue_active(&ctx->wait)) | |
1649 | wake_up(&ctx->wait); | |
534ca6d6 JA |
1650 | if (ctx->sq_data && waitqueue_active(&ctx->sq_data->wait)) |
1651 | wake_up(&ctx->sq_data->wait); | |
b41e9852 | 1652 | if (io_should_trigger_evfd(ctx)) |
1d7bb1d5 JA |
1653 | eventfd_signal(ctx->cq_ev_fd, 1); |
1654 | } | |
1655 | ||
46930143 PB |
1656 | static void io_cqring_mark_overflow(struct io_ring_ctx *ctx) |
1657 | { | |
1658 | if (list_empty(&ctx->cq_overflow_list)) { | |
1659 | clear_bit(0, &ctx->sq_check_overflow); | |
1660 | clear_bit(0, &ctx->cq_check_overflow); | |
1661 | ctx->rings->sq_flags &= ~IORING_SQ_CQ_OVERFLOW; | |
1662 | } | |
1663 | } | |
1664 | ||
99b32808 PB |
1665 | static inline bool __io_match_files(struct io_kiocb *req, |
1666 | struct files_struct *files) | |
e6c8aa9a | 1667 | { |
99b32808 PB |
1668 | return ((req->flags & REQ_F_WORK_INITIALIZED) && |
1669 | (req->work.flags & IO_WQ_WORK_FILES)) && | |
1670 | req->work.identity->files == files; | |
1671 | } | |
1672 | ||
1673 | static bool io_match_files(struct io_kiocb *req, | |
1674 | struct files_struct *files) | |
1675 | { | |
1676 | struct io_kiocb *link; | |
1677 | ||
e6c8aa9a JA |
1678 | if (!files) |
1679 | return true; | |
99b32808 PB |
1680 | if (__io_match_files(req, files)) |
1681 | return true; | |
1682 | if (req->flags & REQ_F_LINK_HEAD) { | |
1683 | list_for_each_entry(link, &req->link_list, link_list) { | |
1684 | if (__io_match_files(link, files)) | |
1685 | return true; | |
1686 | } | |
1687 | } | |
e6c8aa9a JA |
1688 | return false; |
1689 | } | |
1690 | ||
c4a2ed72 | 1691 | /* Returns true if there are no backlogged entries after the flush */ |
e6c8aa9a JA |
1692 | static bool io_cqring_overflow_flush(struct io_ring_ctx *ctx, bool force, |
1693 | struct task_struct *tsk, | |
1694 | struct files_struct *files) | |
1d7bb1d5 JA |
1695 | { |
1696 | struct io_rings *rings = ctx->rings; | |
e6c8aa9a | 1697 | struct io_kiocb *req, *tmp; |
1d7bb1d5 | 1698 | struct io_uring_cqe *cqe; |
1d7bb1d5 JA |
1699 | unsigned long flags; |
1700 | LIST_HEAD(list); | |
1701 | ||
1702 | if (!force) { | |
1703 | if (list_empty_careful(&ctx->cq_overflow_list)) | |
c4a2ed72 | 1704 | return true; |
1d7bb1d5 JA |
1705 | if ((ctx->cached_cq_tail - READ_ONCE(rings->cq.head) == |
1706 | rings->cq_ring_entries)) | |
c4a2ed72 | 1707 | return false; |
1d7bb1d5 JA |
1708 | } |
1709 | ||
1710 | spin_lock_irqsave(&ctx->completion_lock, flags); | |
1711 | ||
1712 | /* if force is set, the ring is going away. always drop after that */ | |
1713 | if (force) | |
69b3e546 | 1714 | ctx->cq_overflow_flushed = 1; |
1d7bb1d5 | 1715 | |
c4a2ed72 | 1716 | cqe = NULL; |
e6c8aa9a JA |
1717 | list_for_each_entry_safe(req, tmp, &ctx->cq_overflow_list, compl.list) { |
1718 | if (tsk && req->task != tsk) | |
1719 | continue; | |
1720 | if (!io_match_files(req, files)) | |
1721 | continue; | |
1722 | ||
1d7bb1d5 JA |
1723 | cqe = io_get_cqring(ctx); |
1724 | if (!cqe && !force) | |
1725 | break; | |
1726 | ||
40d8ddd4 | 1727 | list_move(&req->compl.list, &list); |
1d7bb1d5 JA |
1728 | if (cqe) { |
1729 | WRITE_ONCE(cqe->user_data, req->user_data); | |
1730 | WRITE_ONCE(cqe->res, req->result); | |
0f7e466b | 1731 | WRITE_ONCE(cqe->flags, req->compl.cflags); |
1d7bb1d5 | 1732 | } else { |
2c3bac6d | 1733 | ctx->cached_cq_overflow++; |
1d7bb1d5 | 1734 | WRITE_ONCE(ctx->rings->cq_overflow, |
2c3bac6d | 1735 | ctx->cached_cq_overflow); |
1d7bb1d5 JA |
1736 | } |
1737 | } | |
1738 | ||
1739 | io_commit_cqring(ctx); | |
46930143 PB |
1740 | io_cqring_mark_overflow(ctx); |
1741 | ||
1d7bb1d5 JA |
1742 | spin_unlock_irqrestore(&ctx->completion_lock, flags); |
1743 | io_cqring_ev_posted(ctx); | |
1744 | ||
1745 | while (!list_empty(&list)) { | |
40d8ddd4 PB |
1746 | req = list_first_entry(&list, struct io_kiocb, compl.list); |
1747 | list_del(&req->compl.list); | |
ec9c02ad | 1748 | io_put_req(req); |
1d7bb1d5 | 1749 | } |
c4a2ed72 JA |
1750 | |
1751 | return cqe != NULL; | |
1d7bb1d5 JA |
1752 | } |
1753 | ||
bcda7baa | 1754 | static void __io_cqring_fill_event(struct io_kiocb *req, long res, long cflags) |
2b188cc1 | 1755 | { |
78e19bbe | 1756 | struct io_ring_ctx *ctx = req->ctx; |
2b188cc1 JA |
1757 | struct io_uring_cqe *cqe; |
1758 | ||
78e19bbe | 1759 | trace_io_uring_complete(ctx, req->user_data, res); |
51c3ff62 | 1760 | |
2b188cc1 JA |
1761 | /* |
1762 | * If we can't get a cq entry, userspace overflowed the | |
1763 | * submission (by quite a lot). Increment the overflow count in | |
1764 | * the ring. | |
1765 | */ | |
1766 | cqe = io_get_cqring(ctx); | |
1d7bb1d5 | 1767 | if (likely(cqe)) { |
78e19bbe | 1768 | WRITE_ONCE(cqe->user_data, req->user_data); |
2b188cc1 | 1769 | WRITE_ONCE(cqe->res, res); |
bcda7baa | 1770 | WRITE_ONCE(cqe->flags, cflags); |
fdaf083c JA |
1771 | } else if (ctx->cq_overflow_flushed || |
1772 | atomic_read(&req->task->io_uring->in_idle)) { | |
0f212204 JA |
1773 | /* |
1774 | * If we're in ring overflow flush mode, or in task cancel mode, | |
1775 | * then we cannot store the request for later flushing, we need | |
1776 | * to drop it on the floor. | |
1777 | */ | |
2c3bac6d PB |
1778 | ctx->cached_cq_overflow++; |
1779 | WRITE_ONCE(ctx->rings->cq_overflow, ctx->cached_cq_overflow); | |
1d7bb1d5 | 1780 | } else { |
ad3eb2c8 JA |
1781 | if (list_empty(&ctx->cq_overflow_list)) { |
1782 | set_bit(0, &ctx->sq_check_overflow); | |
1783 | set_bit(0, &ctx->cq_check_overflow); | |
6d5f9049 | 1784 | ctx->rings->sq_flags |= IORING_SQ_CQ_OVERFLOW; |
ad3eb2c8 | 1785 | } |
40d8ddd4 | 1786 | io_clean_op(req); |
1d7bb1d5 | 1787 | req->result = res; |
0f7e466b | 1788 | req->compl.cflags = cflags; |
40d8ddd4 PB |
1789 | refcount_inc(&req->refs); |
1790 | list_add_tail(&req->compl.list, &ctx->cq_overflow_list); | |
2b188cc1 JA |
1791 | } |
1792 | } | |
1793 | ||
bcda7baa JA |
1794 | static void io_cqring_fill_event(struct io_kiocb *req, long res) |
1795 | { | |
1796 | __io_cqring_fill_event(req, res, 0); | |
1797 | } | |
1798 | ||
e1e16097 | 1799 | static void io_cqring_add_event(struct io_kiocb *req, long res, long cflags) |
2b188cc1 | 1800 | { |
78e19bbe | 1801 | struct io_ring_ctx *ctx = req->ctx; |
2b188cc1 JA |
1802 | unsigned long flags; |
1803 | ||
1804 | spin_lock_irqsave(&ctx->completion_lock, flags); | |
bcda7baa | 1805 | __io_cqring_fill_event(req, res, cflags); |
2b188cc1 JA |
1806 | io_commit_cqring(ctx); |
1807 | spin_unlock_irqrestore(&ctx->completion_lock, flags); | |
1808 | ||
8c838788 | 1809 | io_cqring_ev_posted(ctx); |
2b188cc1 JA |
1810 | } |
1811 | ||
229a7b63 | 1812 | static void io_submit_flush_completions(struct io_comp_state *cs) |
bcda7baa | 1813 | { |
229a7b63 JA |
1814 | struct io_ring_ctx *ctx = cs->ctx; |
1815 | ||
1816 | spin_lock_irq(&ctx->completion_lock); | |
1817 | while (!list_empty(&cs->list)) { | |
1818 | struct io_kiocb *req; | |
1819 | ||
3ca405eb PB |
1820 | req = list_first_entry(&cs->list, struct io_kiocb, compl.list); |
1821 | list_del(&req->compl.list); | |
0f7e466b | 1822 | __io_cqring_fill_event(req, req->result, req->compl.cflags); |
216578e5 PB |
1823 | |
1824 | /* | |
1825 | * io_free_req() doesn't care about completion_lock unless one | |
1826 | * of these flags is set. REQ_F_WORK_INITIALIZED is in the list | |
1827 | * because of a potential deadlock with req->work.fs->lock | |
1828 | */ | |
1829 | if (req->flags & (REQ_F_FAIL_LINK|REQ_F_LINK_TIMEOUT | |
1830 | |REQ_F_WORK_INITIALIZED)) { | |
229a7b63 JA |
1831 | spin_unlock_irq(&ctx->completion_lock); |
1832 | io_put_req(req); | |
1833 | spin_lock_irq(&ctx->completion_lock); | |
216578e5 PB |
1834 | } else { |
1835 | io_put_req(req); | |
229a7b63 JA |
1836 | } |
1837 | } | |
1838 | io_commit_cqring(ctx); | |
1839 | spin_unlock_irq(&ctx->completion_lock); | |
1840 | ||
1841 | io_cqring_ev_posted(ctx); | |
1842 | cs->nr = 0; | |
1843 | } | |
1844 | ||
1845 | static void __io_req_complete(struct io_kiocb *req, long res, unsigned cflags, | |
1846 | struct io_comp_state *cs) | |
1847 | { | |
1848 | if (!cs) { | |
1849 | io_cqring_add_event(req, res, cflags); | |
1850 | io_put_req(req); | |
1851 | } else { | |
3ca405eb | 1852 | io_clean_op(req); |
229a7b63 | 1853 | req->result = res; |
0f7e466b | 1854 | req->compl.cflags = cflags; |
3ca405eb | 1855 | list_add_tail(&req->compl.list, &cs->list); |
229a7b63 JA |
1856 | if (++cs->nr >= 32) |
1857 | io_submit_flush_completions(cs); | |
1858 | } | |
e1e16097 JA |
1859 | } |
1860 | ||
1861 | static void io_req_complete(struct io_kiocb *req, long res) | |
bcda7baa | 1862 | { |
229a7b63 | 1863 | __io_req_complete(req, res, 0, NULL); |
bcda7baa JA |
1864 | } |
1865 | ||
0ddf92e8 JA |
1866 | static inline bool io_is_fallback_req(struct io_kiocb *req) |
1867 | { | |
1868 | return req == (struct io_kiocb *) | |
1869 | ((unsigned long) req->ctx->fallback_req & ~1UL); | |
1870 | } | |
1871 | ||
1872 | static struct io_kiocb *io_get_fallback_req(struct io_ring_ctx *ctx) | |
1873 | { | |
1874 | struct io_kiocb *req; | |
1875 | ||
1876 | req = ctx->fallback_req; | |
dd461af6 | 1877 | if (!test_and_set_bit_lock(0, (unsigned long *) &ctx->fallback_req)) |
0ddf92e8 JA |
1878 | return req; |
1879 | ||
1880 | return NULL; | |
1881 | } | |
1882 | ||
0553b8bd PB |
1883 | static struct io_kiocb *io_alloc_req(struct io_ring_ctx *ctx, |
1884 | struct io_submit_state *state) | |
2b188cc1 | 1885 | { |
f6b6c7d6 | 1886 | if (!state->free_reqs) { |
291b2821 | 1887 | gfp_t gfp = GFP_KERNEL | __GFP_NOWARN; |
2579f913 JA |
1888 | size_t sz; |
1889 | int ret; | |
1890 | ||
1891 | sz = min_t(size_t, state->ios_left, ARRAY_SIZE(state->reqs)); | |
fd6fab2c JA |
1892 | ret = kmem_cache_alloc_bulk(req_cachep, gfp, sz, state->reqs); |
1893 | ||
1894 | /* | |
1895 | * Bulk alloc is all-or-nothing. If we fail to get a batch, | |
1896 | * retry single alloc to be on the safe side. | |
1897 | */ | |
1898 | if (unlikely(ret <= 0)) { | |
1899 | state->reqs[0] = kmem_cache_alloc(req_cachep, gfp); | |
1900 | if (!state->reqs[0]) | |
0ddf92e8 | 1901 | goto fallback; |
fd6fab2c JA |
1902 | ret = 1; |
1903 | } | |
291b2821 | 1904 | state->free_reqs = ret; |
2b188cc1 JA |
1905 | } |
1906 | ||
291b2821 PB |
1907 | state->free_reqs--; |
1908 | return state->reqs[state->free_reqs]; | |
0ddf92e8 | 1909 | fallback: |
0553b8bd | 1910 | return io_get_fallback_req(ctx); |
2b188cc1 JA |
1911 | } |
1912 | ||
8da11c19 PB |
1913 | static inline void io_put_file(struct io_kiocb *req, struct file *file, |
1914 | bool fixed) | |
1915 | { | |
1916 | if (fixed) | |
05589553 | 1917 | percpu_ref_put(req->fixed_file_refs); |
8da11c19 PB |
1918 | else |
1919 | fput(file); | |
1920 | } | |
1921 | ||
4edf20f9 | 1922 | static void io_dismantle_req(struct io_kiocb *req) |
2b188cc1 | 1923 | { |
3ca405eb | 1924 | io_clean_op(req); |
929a3af9 | 1925 | |
e8c2bc1f JA |
1926 | if (req->async_data) |
1927 | kfree(req->async_data); | |
8da11c19 PB |
1928 | if (req->file) |
1929 | io_put_file(req, req->file, (req->flags & REQ_F_FIXED_FILE)); | |
fcb323cc | 1930 | |
4edf20f9 | 1931 | io_req_clean_work(req); |
e65ef56d JA |
1932 | } |
1933 | ||
216578e5 | 1934 | static void __io_free_req(struct io_kiocb *req) |
c6ca97b3 | 1935 | { |
0f212204 | 1936 | struct io_uring_task *tctx = req->task->io_uring; |
51a4cc11 | 1937 | struct io_ring_ctx *ctx = req->ctx; |
c6ca97b3 | 1938 | |
216578e5 | 1939 | io_dismantle_req(req); |
c6ca97b3 | 1940 | |
d8a6df10 | 1941 | percpu_counter_dec(&tctx->inflight); |
fdaf083c | 1942 | if (atomic_read(&tctx->in_idle)) |
0f212204 | 1943 | wake_up(&tctx->wait); |
e3bc8e9d JA |
1944 | put_task_struct(req->task); |
1945 | ||
b1e50e54 PB |
1946 | if (likely(!io_is_fallback_req(req))) |
1947 | kmem_cache_free(req_cachep, req); | |
1948 | else | |
ecfc5177 PB |
1949 | clear_bit_unlock(0, (unsigned long *) &ctx->fallback_req); |
1950 | percpu_ref_put(&ctx->refs); | |
e65ef56d JA |
1951 | } |
1952 | ||
c9abd7ad | 1953 | static void io_kill_linked_timeout(struct io_kiocb *req) |
2665abfd | 1954 | { |
a197f664 | 1955 | struct io_ring_ctx *ctx = req->ctx; |
7c86ffee | 1956 | struct io_kiocb *link; |
c9abd7ad PB |
1957 | bool cancelled = false; |
1958 | unsigned long flags; | |
7c86ffee | 1959 | |
c9abd7ad PB |
1960 | spin_lock_irqsave(&ctx->completion_lock, flags); |
1961 | link = list_first_entry_or_null(&req->link_list, struct io_kiocb, | |
1962 | link_list); | |
900fad45 PB |
1963 | /* |
1964 | * Can happen if a linked timeout fired and link had been like | |
1965 | * req -> link t-out -> link t-out [-> ...] | |
1966 | */ | |
c9abd7ad PB |
1967 | if (link && (link->flags & REQ_F_LTIMEOUT_ACTIVE)) { |
1968 | struct io_timeout_data *io = link->async_data; | |
1969 | int ret; | |
7c86ffee | 1970 | |
c9abd7ad PB |
1971 | list_del_init(&link->link_list); |
1972 | ret = hrtimer_try_to_cancel(&io->timer); | |
1973 | if (ret != -1) { | |
1974 | io_cqring_fill_event(link, -ECANCELED); | |
1975 | io_commit_cqring(ctx); | |
1976 | cancelled = true; | |
1977 | } | |
1978 | } | |
7c86ffee | 1979 | req->flags &= ~REQ_F_LINK_TIMEOUT; |
216578e5 | 1980 | spin_unlock_irqrestore(&ctx->completion_lock, flags); |
ab0b6451 | 1981 | |
c9abd7ad | 1982 | if (cancelled) { |
7c86ffee | 1983 | io_cqring_ev_posted(ctx); |
c9abd7ad PB |
1984 | io_put_req(link); |
1985 | } | |
7c86ffee PB |
1986 | } |
1987 | ||
9b5f7bd9 | 1988 | static struct io_kiocb *io_req_link_next(struct io_kiocb *req) |
7c86ffee PB |
1989 | { |
1990 | struct io_kiocb *nxt; | |
4d7dd462 | 1991 | |
9e645e11 JA |
1992 | /* |
1993 | * The list should never be empty when we are called here. But could | |
1994 | * potentially happen if the chain is messed up, check to be on the | |
1995 | * safe side. | |
1996 | */ | |
7c86ffee | 1997 | if (unlikely(list_empty(&req->link_list))) |
9b5f7bd9 | 1998 | return NULL; |
2665abfd | 1999 | |
7c86ffee PB |
2000 | nxt = list_first_entry(&req->link_list, struct io_kiocb, link_list); |
2001 | list_del_init(&req->link_list); | |
2002 | if (!list_empty(&nxt->link_list)) | |
2003 | nxt->flags |= REQ_F_LINK_HEAD; | |
9b5f7bd9 | 2004 | return nxt; |
9e645e11 JA |
2005 | } |
2006 | ||
2007 | /* | |
dea3b49c | 2008 | * Called if REQ_F_LINK_HEAD is set, and we fail the head request |
9e645e11 | 2009 | */ |
d148ca4b | 2010 | static void io_fail_links(struct io_kiocb *req) |
9e645e11 | 2011 | { |
2665abfd | 2012 | struct io_ring_ctx *ctx = req->ctx; |
d148ca4b | 2013 | unsigned long flags; |
9e645e11 | 2014 | |
d148ca4b | 2015 | spin_lock_irqsave(&ctx->completion_lock, flags); |
9e645e11 | 2016 | while (!list_empty(&req->link_list)) { |
4493233e PB |
2017 | struct io_kiocb *link = list_first_entry(&req->link_list, |
2018 | struct io_kiocb, link_list); | |
9e645e11 | 2019 | |
4493233e | 2020 | list_del_init(&link->link_list); |
c826bd7a | 2021 | trace_io_uring_fail_link(req, link); |
2665abfd | 2022 | |
7c86ffee | 2023 | io_cqring_fill_event(link, -ECANCELED); |
216578e5 PB |
2024 | |
2025 | /* | |
2026 | * It's ok to free under spinlock as they're not linked anymore, | |
2027 | * but avoid REQ_F_WORK_INITIALIZED because it may deadlock on | |
2028 | * work.fs->lock. | |
2029 | */ | |
2030 | if (link->flags & REQ_F_WORK_INITIALIZED) | |
2031 | io_put_req_deferred(link, 2); | |
2032 | else | |
2033 | io_double_put_req(link); | |
9e645e11 | 2034 | } |
2665abfd JA |
2035 | |
2036 | io_commit_cqring(ctx); | |
216578e5 | 2037 | spin_unlock_irqrestore(&ctx->completion_lock, flags); |
9e645e11 | 2038 | |
2665abfd | 2039 | io_cqring_ev_posted(ctx); |
9e645e11 JA |
2040 | } |
2041 | ||
3fa5e0f3 | 2042 | static struct io_kiocb *__io_req_find_next(struct io_kiocb *req) |
c69f8dbe | 2043 | { |
9b0d911a | 2044 | req->flags &= ~REQ_F_LINK_HEAD; |
7c86ffee PB |
2045 | if (req->flags & REQ_F_LINK_TIMEOUT) |
2046 | io_kill_linked_timeout(req); | |
944e58bf | 2047 | |
9e645e11 JA |
2048 | /* |
2049 | * If LINK is set, we have dependent requests in this chain. If we | |
2050 | * didn't fail this request, queue the first one up, moving any other | |
2051 | * dependencies to the next request. In case of failure, fail the rest | |
2052 | * of the chain. | |
2053 | */ | |
9b5f7bd9 PB |
2054 | if (likely(!(req->flags & REQ_F_FAIL_LINK))) |
2055 | return io_req_link_next(req); | |
2056 | io_fail_links(req); | |
2057 | return NULL; | |
4d7dd462 | 2058 | } |
9e645e11 | 2059 | |
3fa5e0f3 PB |
2060 | static struct io_kiocb *io_req_find_next(struct io_kiocb *req) |
2061 | { | |
2062 | if (likely(!(req->flags & REQ_F_LINK_HEAD))) | |
2063 | return NULL; | |
2064 | return __io_req_find_next(req); | |
2065 | } | |
2066 | ||
87c4311f | 2067 | static int io_req_task_work_add(struct io_kiocb *req, bool twa_signal_ok) |
c2c4c83c JA |
2068 | { |
2069 | struct task_struct *tsk = req->task; | |
2070 | struct io_ring_ctx *ctx = req->ctx; | |
91989c70 JA |
2071 | enum task_work_notify_mode notify; |
2072 | int ret; | |
c2c4c83c | 2073 | |
6200b0ae JA |
2074 | if (tsk->flags & PF_EXITING) |
2075 | return -ESRCH; | |
2076 | ||
c2c4c83c | 2077 | /* |
0ba9c9ed JA |
2078 | * SQPOLL kernel thread doesn't need notification, just a wakeup. For |
2079 | * all other cases, use TWA_SIGNAL unconditionally to ensure we're | |
2080 | * processing task_work. There's no reliable way to tell if TWA_RESUME | |
2081 | * will do the job. | |
c2c4c83c | 2082 | */ |
91989c70 | 2083 | notify = TWA_NONE; |
fd7d6de2 | 2084 | if (!(ctx->flags & IORING_SETUP_SQPOLL) && twa_signal_ok) |
c2c4c83c JA |
2085 | notify = TWA_SIGNAL; |
2086 | ||
87c4311f | 2087 | ret = task_work_add(tsk, &req->task_work, notify); |
c2c4c83c JA |
2088 | if (!ret) |
2089 | wake_up_process(tsk); | |
0ba9c9ed | 2090 | |
c2c4c83c JA |
2091 | return ret; |
2092 | } | |
2093 | ||
c40f6379 JA |
2094 | static void __io_req_task_cancel(struct io_kiocb *req, int error) |
2095 | { | |
2096 | struct io_ring_ctx *ctx = req->ctx; | |
2097 | ||
2098 | spin_lock_irq(&ctx->completion_lock); | |
2099 | io_cqring_fill_event(req, error); | |
2100 | io_commit_cqring(ctx); | |
2101 | spin_unlock_irq(&ctx->completion_lock); | |
2102 | ||
2103 | io_cqring_ev_posted(ctx); | |
2104 | req_set_fail_links(req); | |
2105 | io_double_put_req(req); | |
2106 | } | |
2107 | ||
2108 | static void io_req_task_cancel(struct callback_head *cb) | |
2109 | { | |
2110 | struct io_kiocb *req = container_of(cb, struct io_kiocb, task_work); | |
87ceb6a6 | 2111 | struct io_ring_ctx *ctx = req->ctx; |
c40f6379 JA |
2112 | |
2113 | __io_req_task_cancel(req, -ECANCELED); | |
87ceb6a6 | 2114 | percpu_ref_put(&ctx->refs); |
c40f6379 JA |
2115 | } |
2116 | ||
2117 | static void __io_req_task_submit(struct io_kiocb *req) | |
2118 | { | |
2119 | struct io_ring_ctx *ctx = req->ctx; | |
2120 | ||
c40f6379 | 2121 | if (!__io_sq_thread_acquire_mm(ctx)) { |
28cea78a | 2122 | __io_sq_thread_acquire_files(ctx); |
c40f6379 | 2123 | mutex_lock(&ctx->uring_lock); |
c1379e24 | 2124 | __io_queue_sqe(req, NULL); |
c40f6379 JA |
2125 | mutex_unlock(&ctx->uring_lock); |
2126 | } else { | |
2127 | __io_req_task_cancel(req, -EFAULT); | |
2128 | } | |
2129 | } | |
2130 | ||
2131 | static void io_req_task_submit(struct callback_head *cb) | |
2132 | { | |
2133 | struct io_kiocb *req = container_of(cb, struct io_kiocb, task_work); | |
6d816e08 | 2134 | struct io_ring_ctx *ctx = req->ctx; |
c40f6379 JA |
2135 | |
2136 | __io_req_task_submit(req); | |
6d816e08 | 2137 | percpu_ref_put(&ctx->refs); |
c40f6379 JA |
2138 | } |
2139 | ||
2140 | static void io_req_task_queue(struct io_kiocb *req) | |
2141 | { | |
c40f6379 JA |
2142 | int ret; |
2143 | ||
2144 | init_task_work(&req->task_work, io_req_task_submit); | |
6d816e08 | 2145 | percpu_ref_get(&req->ctx->refs); |
c40f6379 | 2146 | |
87c4311f | 2147 | ret = io_req_task_work_add(req, true); |
c40f6379 | 2148 | if (unlikely(ret)) { |
c2c4c83c JA |
2149 | struct task_struct *tsk; |
2150 | ||
c40f6379 JA |
2151 | init_task_work(&req->task_work, io_req_task_cancel); |
2152 | tsk = io_wq_get_task(req->ctx->io_wq); | |
91989c70 | 2153 | task_work_add(tsk, &req->task_work, TWA_NONE); |
c2c4c83c | 2154 | wake_up_process(tsk); |
c40f6379 | 2155 | } |
c40f6379 JA |
2156 | } |
2157 | ||
c3524383 | 2158 | static void io_queue_next(struct io_kiocb *req) |
c69f8dbe | 2159 | { |
9b5f7bd9 | 2160 | struct io_kiocb *nxt = io_req_find_next(req); |
944e58bf PB |
2161 | |
2162 | if (nxt) | |
906a8c3f | 2163 | io_req_task_queue(nxt); |
c69f8dbe JL |
2164 | } |
2165 | ||
c3524383 | 2166 | static void io_free_req(struct io_kiocb *req) |
7a743e22 | 2167 | { |
c3524383 PB |
2168 | io_queue_next(req); |
2169 | __io_free_req(req); | |
2170 | } | |
8766dd51 | 2171 | |
2d6500d4 PB |
2172 | struct req_batch { |
2173 | void *reqs[IO_IOPOLL_BATCH]; | |
2174 | int to_free; | |
7a743e22 | 2175 | |
5af1d13e PB |
2176 | struct task_struct *task; |
2177 | int task_refs; | |
2d6500d4 PB |
2178 | }; |
2179 | ||
5af1d13e PB |
2180 | static inline void io_init_req_batch(struct req_batch *rb) |
2181 | { | |
2182 | rb->to_free = 0; | |
2183 | rb->task_refs = 0; | |
2184 | rb->task = NULL; | |
2185 | } | |
2186 | ||
2d6500d4 PB |
2187 | static void __io_req_free_batch_flush(struct io_ring_ctx *ctx, |
2188 | struct req_batch *rb) | |
2189 | { | |
2190 | kmem_cache_free_bulk(req_cachep, rb->to_free, rb->reqs); | |
2191 | percpu_ref_put_many(&ctx->refs, rb->to_free); | |
2192 | rb->to_free = 0; | |
2193 | } | |
2194 | ||
2195 | static void io_req_free_batch_finish(struct io_ring_ctx *ctx, | |
2196 | struct req_batch *rb) | |
2197 | { | |
2198 | if (rb->to_free) | |
2199 | __io_req_free_batch_flush(ctx, rb); | |
5af1d13e | 2200 | if (rb->task) { |
d8a6df10 JA |
2201 | struct io_uring_task *tctx = rb->task->io_uring; |
2202 | ||
2203 | percpu_counter_sub(&tctx->inflight, rb->task_refs); | |
5af1d13e PB |
2204 | put_task_struct_many(rb->task, rb->task_refs); |
2205 | rb->task = NULL; | |
2206 | } | |
2d6500d4 PB |
2207 | } |
2208 | ||
2209 | static void io_req_free_batch(struct req_batch *rb, struct io_kiocb *req) | |
2210 | { | |
2211 | if (unlikely(io_is_fallback_req(req))) { | |
2212 | io_free_req(req); | |
2213 | return; | |
2214 | } | |
2215 | if (req->flags & REQ_F_LINK_HEAD) | |
2216 | io_queue_next(req); | |
2217 | ||
e3bc8e9d | 2218 | if (req->task != rb->task) { |
0f212204 | 2219 | if (rb->task) { |
d8a6df10 JA |
2220 | struct io_uring_task *tctx = rb->task->io_uring; |
2221 | ||
2222 | percpu_counter_sub(&tctx->inflight, rb->task_refs); | |
e3bc8e9d | 2223 | put_task_struct_many(rb->task, rb->task_refs); |
5af1d13e | 2224 | } |
e3bc8e9d JA |
2225 | rb->task = req->task; |
2226 | rb->task_refs = 0; | |
5af1d13e | 2227 | } |
e3bc8e9d | 2228 | rb->task_refs++; |
5af1d13e | 2229 | |
4edf20f9 | 2230 | io_dismantle_req(req); |
2d6500d4 PB |
2231 | rb->reqs[rb->to_free++] = req; |
2232 | if (unlikely(rb->to_free == ARRAY_SIZE(rb->reqs))) | |
2233 | __io_req_free_batch_flush(req->ctx, rb); | |
7a743e22 PB |
2234 | } |
2235 | ||
ba816ad6 JA |
2236 | /* |
2237 | * Drop reference to request, return next in chain (if there is one) if this | |
2238 | * was the last reference to this request. | |
2239 | */ | |
9b5f7bd9 | 2240 | static struct io_kiocb *io_put_req_find_next(struct io_kiocb *req) |
e65ef56d | 2241 | { |
9b5f7bd9 PB |
2242 | struct io_kiocb *nxt = NULL; |
2243 | ||
2a44f467 | 2244 | if (refcount_dec_and_test(&req->refs)) { |
9b5f7bd9 | 2245 | nxt = io_req_find_next(req); |
4d7dd462 | 2246 | __io_free_req(req); |
2a44f467 | 2247 | } |
9b5f7bd9 | 2248 | return nxt; |
2b188cc1 JA |
2249 | } |
2250 | ||
e65ef56d JA |
2251 | static void io_put_req(struct io_kiocb *req) |
2252 | { | |
2253 | if (refcount_dec_and_test(&req->refs)) | |
2254 | io_free_req(req); | |
2b188cc1 JA |
2255 | } |
2256 | ||
216578e5 PB |
2257 | static void io_put_req_deferred_cb(struct callback_head *cb) |
2258 | { | |
2259 | struct io_kiocb *req = container_of(cb, struct io_kiocb, task_work); | |
2260 | ||
2261 | io_free_req(req); | |
2262 | } | |
2263 | ||
2264 | static void io_free_req_deferred(struct io_kiocb *req) | |
2265 | { | |
2266 | int ret; | |
2267 | ||
2268 | init_task_work(&req->task_work, io_put_req_deferred_cb); | |
2269 | ret = io_req_task_work_add(req, true); | |
2270 | if (unlikely(ret)) { | |
2271 | struct task_struct *tsk; | |
2272 | ||
2273 | tsk = io_wq_get_task(req->ctx->io_wq); | |
91989c70 | 2274 | task_work_add(tsk, &req->task_work, TWA_NONE); |
216578e5 PB |
2275 | wake_up_process(tsk); |
2276 | } | |
2277 | } | |
2278 | ||
2279 | static inline void io_put_req_deferred(struct io_kiocb *req, int refs) | |
2280 | { | |
2281 | if (refcount_sub_and_test(refs, &req->refs)) | |
2282 | io_free_req_deferred(req); | |
2283 | } | |
2284 | ||
f4db7182 | 2285 | static struct io_wq_work *io_steal_work(struct io_kiocb *req) |
7a743e22 | 2286 | { |
6df1db6b | 2287 | struct io_kiocb *nxt; |
f4db7182 | 2288 | |
7a743e22 | 2289 | /* |
f4db7182 PB |
2290 | * A ref is owned by io-wq in which context we're. So, if that's the |
2291 | * last one, it's safe to steal next work. False negatives are Ok, | |
2292 | * it just will be re-punted async in io_put_work() | |
7a743e22 | 2293 | */ |
f4db7182 PB |
2294 | if (refcount_read(&req->refs) != 1) |
2295 | return NULL; | |
7a743e22 | 2296 | |
9b5f7bd9 | 2297 | nxt = io_req_find_next(req); |
6df1db6b | 2298 | return nxt ? &nxt->work : NULL; |
7a743e22 PB |
2299 | } |
2300 | ||
978db57e JA |
2301 | static void io_double_put_req(struct io_kiocb *req) |
2302 | { | |
2303 | /* drop both submit and complete references */ | |
2304 | if (refcount_sub_and_test(2, &req->refs)) | |
2305 | io_free_req(req); | |
2306 | } | |
2307 | ||
1d7bb1d5 | 2308 | static unsigned io_cqring_events(struct io_ring_ctx *ctx, bool noflush) |
a3a0e43f | 2309 | { |
84f97dc2 JA |
2310 | struct io_rings *rings = ctx->rings; |
2311 | ||
ad3eb2c8 JA |
2312 | if (test_bit(0, &ctx->cq_check_overflow)) { |
2313 | /* | |
2314 | * noflush == true is from the waitqueue handler, just ensure | |
2315 | * we wake up the task, and the next invocation will flush the | |
2316 | * entries. We cannot safely to it from here. | |
2317 | */ | |
2318 | if (noflush && !list_empty(&ctx->cq_overflow_list)) | |
2319 | return -1U; | |
1d7bb1d5 | 2320 | |
e6c8aa9a | 2321 | io_cqring_overflow_flush(ctx, false, NULL, NULL); |
ad3eb2c8 | 2322 | } |
1d7bb1d5 | 2323 | |
a3a0e43f JA |
2324 | /* See comment at the top of this file */ |
2325 | smp_rmb(); | |
ad3eb2c8 | 2326 | return ctx->cached_cq_tail - READ_ONCE(rings->cq.head); |
a3a0e43f JA |
2327 | } |
2328 | ||
fb5ccc98 PB |
2329 | static inline unsigned int io_sqring_entries(struct io_ring_ctx *ctx) |
2330 | { | |
2331 | struct io_rings *rings = ctx->rings; | |
2332 | ||
2333 | /* make sure SQ entry isn't read before tail */ | |
2334 | return smp_load_acquire(&rings->sq.tail) - ctx->cached_sq_head; | |
2335 | } | |
2336 | ||
8ff069bf | 2337 | static unsigned int io_put_kbuf(struct io_kiocb *req, struct io_buffer *kbuf) |
e94f141b | 2338 | { |
8ff069bf | 2339 | unsigned int cflags; |
e94f141b | 2340 | |
bcda7baa JA |
2341 | cflags = kbuf->bid << IORING_CQE_BUFFER_SHIFT; |
2342 | cflags |= IORING_CQE_F_BUFFER; | |
0e1b6fe3 | 2343 | req->flags &= ~REQ_F_BUFFER_SELECTED; |
bcda7baa JA |
2344 | kfree(kbuf); |
2345 | return cflags; | |
e94f141b JA |
2346 | } |
2347 | ||
8ff069bf | 2348 | static inline unsigned int io_put_rw_kbuf(struct io_kiocb *req) |
bcda7baa | 2349 | { |
4d954c25 | 2350 | struct io_buffer *kbuf; |
bcda7baa | 2351 | |
4d954c25 | 2352 | kbuf = (struct io_buffer *) (unsigned long) req->rw.addr; |
8ff069bf PB |
2353 | return io_put_kbuf(req, kbuf); |
2354 | } | |
2355 | ||
4c6e277c JA |
2356 | static inline bool io_run_task_work(void) |
2357 | { | |
6200b0ae JA |
2358 | /* |
2359 | * Not safe to run on exiting task, and the task_work handling will | |
2360 | * not add work to such a task. | |
2361 | */ | |
2362 | if (unlikely(current->flags & PF_EXITING)) | |
2363 | return false; | |
4c6e277c JA |
2364 | if (current->task_works) { |
2365 | __set_current_state(TASK_RUNNING); | |
2366 | task_work_run(); | |
2367 | return true; | |
2368 | } | |
2369 | ||
2370 | return false; | |
bcda7baa JA |
2371 | } |
2372 | ||
bbde017a XW |
2373 | static void io_iopoll_queue(struct list_head *again) |
2374 | { | |
2375 | struct io_kiocb *req; | |
2376 | ||
2377 | do { | |
d21ffe7e PB |
2378 | req = list_first_entry(again, struct io_kiocb, inflight_entry); |
2379 | list_del(&req->inflight_entry); | |
81b68a5c | 2380 | __io_complete_rw(req, -EAGAIN, 0, NULL); |
bbde017a XW |
2381 | } while (!list_empty(again)); |
2382 | } | |
2383 | ||
def596e9 JA |
2384 | /* |
2385 | * Find and free completed poll iocbs | |
2386 | */ | |
2387 | static void io_iopoll_complete(struct io_ring_ctx *ctx, unsigned int *nr_events, | |
2388 | struct list_head *done) | |
2389 | { | |
8237e045 | 2390 | struct req_batch rb; |
def596e9 | 2391 | struct io_kiocb *req; |
bbde017a XW |
2392 | LIST_HEAD(again); |
2393 | ||
2394 | /* order with ->result store in io_complete_rw_iopoll() */ | |
2395 | smp_rmb(); | |
def596e9 | 2396 | |
5af1d13e | 2397 | io_init_req_batch(&rb); |
def596e9 | 2398 | while (!list_empty(done)) { |
bcda7baa JA |
2399 | int cflags = 0; |
2400 | ||
d21ffe7e | 2401 | req = list_first_entry(done, struct io_kiocb, inflight_entry); |
bbde017a | 2402 | if (READ_ONCE(req->result) == -EAGAIN) { |
56450c20 | 2403 | req->result = 0; |
bbde017a | 2404 | req->iopoll_completed = 0; |
d21ffe7e | 2405 | list_move_tail(&req->inflight_entry, &again); |
bbde017a XW |
2406 | continue; |
2407 | } | |
d21ffe7e | 2408 | list_del(&req->inflight_entry); |
def596e9 | 2409 | |
bcda7baa | 2410 | if (req->flags & REQ_F_BUFFER_SELECTED) |
8ff069bf | 2411 | cflags = io_put_rw_kbuf(req); |
bcda7baa JA |
2412 | |
2413 | __io_cqring_fill_event(req, req->result, cflags); | |
def596e9 JA |
2414 | (*nr_events)++; |
2415 | ||
c3524383 | 2416 | if (refcount_dec_and_test(&req->refs)) |
2d6500d4 | 2417 | io_req_free_batch(&rb, req); |
def596e9 | 2418 | } |
def596e9 | 2419 | |
09bb8394 | 2420 | io_commit_cqring(ctx); |
32b2244a XW |
2421 | if (ctx->flags & IORING_SETUP_SQPOLL) |
2422 | io_cqring_ev_posted(ctx); | |
2d6500d4 | 2423 | io_req_free_batch_finish(ctx, &rb); |
581f9810 | 2424 | |
bbde017a XW |
2425 | if (!list_empty(&again)) |
2426 | io_iopoll_queue(&again); | |
581f9810 BM |
2427 | } |
2428 | ||
def596e9 JA |
2429 | static int io_do_iopoll(struct io_ring_ctx *ctx, unsigned int *nr_events, |
2430 | long min) | |
2431 | { | |
2432 | struct io_kiocb *req, *tmp; | |
2433 | LIST_HEAD(done); | |
2434 | bool spin; | |
2435 | int ret; | |
2436 | ||
2437 | /* | |
2438 | * Only spin for completions if we don't have multiple devices hanging | |
2439 | * off our complete list, and we're under the requested amount. | |
2440 | */ | |
2441 | spin = !ctx->poll_multi_file && *nr_events < min; | |
2442 | ||
2443 | ret = 0; | |
d21ffe7e | 2444 | list_for_each_entry_safe(req, tmp, &ctx->iopoll_list, inflight_entry) { |
9adbd45d | 2445 | struct kiocb *kiocb = &req->rw.kiocb; |
def596e9 JA |
2446 | |
2447 | /* | |
581f9810 BM |
2448 | * Move completed and retryable entries to our local lists. |
2449 | * If we find a request that requires polling, break out | |
2450 | * and complete those lists first, if we have entries there. | |
def596e9 | 2451 | */ |
65a6543d | 2452 | if (READ_ONCE(req->iopoll_completed)) { |
d21ffe7e | 2453 | list_move_tail(&req->inflight_entry, &done); |
def596e9 JA |
2454 | continue; |
2455 | } | |
2456 | if (!list_empty(&done)) | |
2457 | break; | |
2458 | ||
2459 | ret = kiocb->ki_filp->f_op->iopoll(kiocb, spin); | |
2460 | if (ret < 0) | |
2461 | break; | |
2462 | ||
3aadc23e PB |
2463 | /* iopoll may have completed current req */ |
2464 | if (READ_ONCE(req->iopoll_completed)) | |
d21ffe7e | 2465 | list_move_tail(&req->inflight_entry, &done); |
3aadc23e | 2466 | |
def596e9 JA |
2467 | if (ret && spin) |
2468 | spin = false; | |
2469 | ret = 0; | |
2470 | } | |
2471 | ||
2472 | if (!list_empty(&done)) | |
2473 | io_iopoll_complete(ctx, nr_events, &done); | |
2474 | ||
2475 | return ret; | |
2476 | } | |
2477 | ||
2478 | /* | |
d195a66e | 2479 | * Poll for a minimum of 'min' events. Note that if min == 0 we consider that a |
def596e9 JA |
2480 | * non-spinning poll check - we'll still enter the driver poll loop, but only |
2481 | * as a non-spinning completion check. | |
2482 | */ | |
2483 | static int io_iopoll_getevents(struct io_ring_ctx *ctx, unsigned int *nr_events, | |
2484 | long min) | |
2485 | { | |
540e32a0 | 2486 | while (!list_empty(&ctx->iopoll_list) && !need_resched()) { |
def596e9 JA |
2487 | int ret; |
2488 | ||
2489 | ret = io_do_iopoll(ctx, nr_events, min); | |
2490 | if (ret < 0) | |
2491 | return ret; | |
eba0a4dd | 2492 | if (*nr_events >= min) |
def596e9 JA |
2493 | return 0; |
2494 | } | |
2495 | ||
2496 | return 1; | |
2497 | } | |
2498 | ||
2499 | /* | |
2500 | * We can't just wait for polled events to come to us, we have to actively | |
2501 | * find and complete them. | |
2502 | */ | |
b2edc0a7 | 2503 | static void io_iopoll_try_reap_events(struct io_ring_ctx *ctx) |
def596e9 JA |
2504 | { |
2505 | if (!(ctx->flags & IORING_SETUP_IOPOLL)) | |
2506 | return; | |
2507 | ||
2508 | mutex_lock(&ctx->uring_lock); | |
540e32a0 | 2509 | while (!list_empty(&ctx->iopoll_list)) { |
def596e9 JA |
2510 | unsigned int nr_events = 0; |
2511 | ||
b2edc0a7 | 2512 | io_do_iopoll(ctx, &nr_events, 0); |
08f5439f | 2513 | |
b2edc0a7 PB |
2514 | /* let it sleep and repeat later if can't complete a request */ |
2515 | if (nr_events == 0) | |
2516 | break; | |
08f5439f JA |
2517 | /* |
2518 | * Ensure we allow local-to-the-cpu processing to take place, | |
2519 | * in this case we need to ensure that we reap all events. | |
3fcee5a6 | 2520 | * Also let task_work, etc. to progress by releasing the mutex |
08f5439f | 2521 | */ |
3fcee5a6 PB |
2522 | if (need_resched()) { |
2523 | mutex_unlock(&ctx->uring_lock); | |
2524 | cond_resched(); | |
2525 | mutex_lock(&ctx->uring_lock); | |
2526 | } | |
def596e9 JA |
2527 | } |
2528 | mutex_unlock(&ctx->uring_lock); | |
2529 | } | |
2530 | ||
7668b92a | 2531 | static int io_iopoll_check(struct io_ring_ctx *ctx, long min) |
def596e9 | 2532 | { |
7668b92a | 2533 | unsigned int nr_events = 0; |
2b2ed975 | 2534 | int iters = 0, ret = 0; |
500f9fba | 2535 | |
c7849be9 XW |
2536 | /* |
2537 | * We disallow the app entering submit/complete with polling, but we | |
2538 | * still need to lock the ring to prevent racing with polled issue | |
2539 | * that got punted to a workqueue. | |
2540 | */ | |
2541 | mutex_lock(&ctx->uring_lock); | |
def596e9 | 2542 | do { |
a3a0e43f JA |
2543 | /* |
2544 | * Don't enter poll loop if we already have events pending. | |
2545 | * If we do, we can potentially be spinning for commands that | |
2546 | * already triggered a CQE (eg in error). | |
2547 | */ | |
1d7bb1d5 | 2548 | if (io_cqring_events(ctx, false)) |
a3a0e43f JA |
2549 | break; |
2550 | ||
500f9fba JA |
2551 | /* |
2552 | * If a submit got punted to a workqueue, we can have the | |
2553 | * application entering polling for a command before it gets | |
2554 | * issued. That app will hold the uring_lock for the duration | |
2555 | * of the poll right here, so we need to take a breather every | |
2556 | * now and then to ensure that the issue has a chance to add | |
2557 | * the poll to the issued list. Otherwise we can spin here | |
2558 | * forever, while the workqueue is stuck trying to acquire the | |
2559 | * very same mutex. | |
2560 | */ | |
2561 | if (!(++iters & 7)) { | |
2562 | mutex_unlock(&ctx->uring_lock); | |
4c6e277c | 2563 | io_run_task_work(); |
500f9fba JA |
2564 | mutex_lock(&ctx->uring_lock); |
2565 | } | |
2566 | ||
7668b92a | 2567 | ret = io_iopoll_getevents(ctx, &nr_events, min); |
def596e9 JA |
2568 | if (ret <= 0) |
2569 | break; | |
2570 | ret = 0; | |
7668b92a | 2571 | } while (min && !nr_events && !need_resched()); |
def596e9 | 2572 | |
500f9fba | 2573 | mutex_unlock(&ctx->uring_lock); |
def596e9 JA |
2574 | return ret; |
2575 | } | |
2576 | ||
491381ce | 2577 | static void kiocb_end_write(struct io_kiocb *req) |
2b188cc1 | 2578 | { |
491381ce JA |
2579 | /* |
2580 | * Tell lockdep we inherited freeze protection from submission | |
2581 | * thread. | |
2582 | */ | |
2583 | if (req->flags & REQ_F_ISREG) { | |
2584 | struct inode *inode = file_inode(req->file); | |
2b188cc1 | 2585 | |
491381ce | 2586 | __sb_writers_acquired(inode->i_sb, SB_FREEZE_WRITE); |
2b188cc1 | 2587 | } |
491381ce | 2588 | file_end_write(req->file); |
2b188cc1 JA |
2589 | } |
2590 | ||
a1d7c393 JA |
2591 | static void io_complete_rw_common(struct kiocb *kiocb, long res, |
2592 | struct io_comp_state *cs) | |
2b188cc1 | 2593 | { |
9adbd45d | 2594 | struct io_kiocb *req = container_of(kiocb, struct io_kiocb, rw.kiocb); |
bcda7baa | 2595 | int cflags = 0; |
2b188cc1 | 2596 | |
491381ce JA |
2597 | if (kiocb->ki_flags & IOCB_WRITE) |
2598 | kiocb_end_write(req); | |
2b188cc1 | 2599 | |
4e88d6e7 JA |
2600 | if (res != req->result) |
2601 | req_set_fail_links(req); | |
bcda7baa | 2602 | if (req->flags & REQ_F_BUFFER_SELECTED) |
8ff069bf | 2603 | cflags = io_put_rw_kbuf(req); |
a1d7c393 | 2604 | __io_req_complete(req, res, cflags, cs); |
ba816ad6 JA |
2605 | } |
2606 | ||
b63534c4 JA |
2607 | #ifdef CONFIG_BLOCK |
2608 | static bool io_resubmit_prep(struct io_kiocb *req, int error) | |
2609 | { | |
2610 | struct iovec inline_vecs[UIO_FASTIOV], *iovec = inline_vecs; | |
2611 | ssize_t ret = -ECANCELED; | |
2612 | struct iov_iter iter; | |
2613 | int rw; | |
2614 | ||
2615 | if (error) { | |
2616 | ret = error; | |
2617 | goto end_req; | |
2618 | } | |
2619 | ||
2620 | switch (req->opcode) { | |
2621 | case IORING_OP_READV: | |
2622 | case IORING_OP_READ_FIXED: | |
2623 | case IORING_OP_READ: | |
2624 | rw = READ; | |
2625 | break; | |
2626 | case IORING_OP_WRITEV: | |
2627 | case IORING_OP_WRITE_FIXED: | |
2628 | case IORING_OP_WRITE: | |
2629 | rw = WRITE; | |
2630 | break; | |
2631 | default: | |
2632 | printk_once(KERN_WARNING "io_uring: bad opcode in resubmit %d\n", | |
2633 | req->opcode); | |
2634 | goto end_req; | |
2635 | } | |
2636 | ||
e8c2bc1f | 2637 | if (!req->async_data) { |
8f3d7496 JA |
2638 | ret = io_import_iovec(rw, req, &iovec, &iter, false); |
2639 | if (ret < 0) | |
2640 | goto end_req; | |
2641 | ret = io_setup_async_rw(req, iovec, inline_vecs, &iter, false); | |
2642 | if (!ret) | |
2643 | return true; | |
2644 | kfree(iovec); | |
2645 | } else { | |
b63534c4 | 2646 | return true; |
8f3d7496 | 2647 | } |
b63534c4 | 2648 | end_req: |
b63534c4 | 2649 | req_set_fail_links(req); |
b63534c4 JA |
2650 | return false; |
2651 | } | |
b63534c4 JA |
2652 | #endif |
2653 | ||
2654 | static bool io_rw_reissue(struct io_kiocb *req, long res) | |
2655 | { | |
2656 | #ifdef CONFIG_BLOCK | |
355afaeb | 2657 | umode_t mode = file_inode(req->file)->i_mode; |
b63534c4 JA |
2658 | int ret; |
2659 | ||
355afaeb JA |
2660 | if (!S_ISBLK(mode) && !S_ISREG(mode)) |
2661 | return false; | |
b63534c4 JA |
2662 | if ((res != -EAGAIN && res != -EOPNOTSUPP) || io_wq_current_is_worker()) |
2663 | return false; | |
2664 | ||
28cea78a | 2665 | ret = io_sq_thread_acquire_mm_files(req->ctx, req); |
6d816e08 | 2666 | |
fdee946d JA |
2667 | if (io_resubmit_prep(req, ret)) { |
2668 | refcount_inc(&req->refs); | |
2669 | io_queue_async_work(req); | |
b63534c4 | 2670 | return true; |
fdee946d JA |
2671 | } |
2672 | ||
b63534c4 JA |
2673 | #endif |
2674 | return false; | |
2675 | } | |
2676 | ||
a1d7c393 JA |
2677 | static void __io_complete_rw(struct io_kiocb *req, long res, long res2, |
2678 | struct io_comp_state *cs) | |
2679 | { | |
2680 | if (!io_rw_reissue(req, res)) | |
2681 | io_complete_rw_common(&req->rw.kiocb, res, cs); | |
ba816ad6 JA |
2682 | } |
2683 | ||
2684 | static void io_complete_rw(struct kiocb *kiocb, long res, long res2) | |
2685 | { | |
9adbd45d | 2686 | struct io_kiocb *req = container_of(kiocb, struct io_kiocb, rw.kiocb); |
ba816ad6 | 2687 | |
a1d7c393 | 2688 | __io_complete_rw(req, res, res2, NULL); |
2b188cc1 JA |
2689 | } |
2690 | ||
def596e9 JA |
2691 | static void io_complete_rw_iopoll(struct kiocb *kiocb, long res, long res2) |
2692 | { | |
9adbd45d | 2693 | struct io_kiocb *req = container_of(kiocb, struct io_kiocb, rw.kiocb); |
def596e9 | 2694 | |
491381ce JA |
2695 | if (kiocb->ki_flags & IOCB_WRITE) |
2696 | kiocb_end_write(req); | |
def596e9 | 2697 | |
2d7d6792 | 2698 | if (res != -EAGAIN && res != req->result) |
4e88d6e7 | 2699 | req_set_fail_links(req); |
bbde017a XW |
2700 | |
2701 | WRITE_ONCE(req->result, res); | |
2702 | /* order with io_poll_complete() checking ->result */ | |
cd664b0e PB |
2703 | smp_wmb(); |
2704 | WRITE_ONCE(req->iopoll_completed, 1); | |
def596e9 JA |
2705 | } |
2706 | ||
2707 | /* | |
2708 | * After the iocb has been issued, it's safe to be found on the poll list. | |
2709 | * Adding the kiocb to the list AFTER submission ensures that we don't | |
2710 | * find it from a io_iopoll_getevents() thread before the issuer is done | |
2711 | * accessing the kiocb cookie. | |
2712 | */ | |
2713 | static void io_iopoll_req_issued(struct io_kiocb *req) | |
2714 | { | |
2715 | struct io_ring_ctx *ctx = req->ctx; | |
2716 | ||
2717 | /* | |
2718 | * Track whether we have multiple files in our lists. This will impact | |
2719 | * how we do polling eventually, not spinning if we're on potentially | |
2720 | * different devices. | |
2721 | */ | |
540e32a0 | 2722 | if (list_empty(&ctx->iopoll_list)) { |
def596e9 JA |
2723 | ctx->poll_multi_file = false; |
2724 | } else if (!ctx->poll_multi_file) { | |
2725 | struct io_kiocb *list_req; | |
2726 | ||
540e32a0 | 2727 | list_req = list_first_entry(&ctx->iopoll_list, struct io_kiocb, |
d21ffe7e | 2728 | inflight_entry); |
9adbd45d | 2729 | if (list_req->file != req->file) |
def596e9 JA |
2730 | ctx->poll_multi_file = true; |
2731 | } | |
2732 | ||
2733 | /* | |
2734 | * For fast devices, IO may have already completed. If it has, add | |
2735 | * it to the front so we find it first. | |
2736 | */ | |
65a6543d | 2737 | if (READ_ONCE(req->iopoll_completed)) |
d21ffe7e | 2738 | list_add(&req->inflight_entry, &ctx->iopoll_list); |
def596e9 | 2739 | else |
d21ffe7e | 2740 | list_add_tail(&req->inflight_entry, &ctx->iopoll_list); |
bdcd3eab XW |
2741 | |
2742 | if ((ctx->flags & IORING_SETUP_SQPOLL) && | |
534ca6d6 JA |
2743 | wq_has_sleeper(&ctx->sq_data->wait)) |
2744 | wake_up(&ctx->sq_data->wait); | |
def596e9 JA |
2745 | } |
2746 | ||
9f13c35b | 2747 | static void __io_state_file_put(struct io_submit_state *state) |
9a56a232 | 2748 | { |
06ef3608 PB |
2749 | if (state->has_refs) |
2750 | fput_many(state->file, state->has_refs); | |
9f13c35b PB |
2751 | state->file = NULL; |
2752 | } | |
2753 | ||
2754 | static inline void io_state_file_put(struct io_submit_state *state) | |
2755 | { | |
2756 | if (state->file) | |
2757 | __io_state_file_put(state); | |
9a56a232 JA |
2758 | } |
2759 | ||
2760 | /* | |
2761 | * Get as many references to a file as we have IOs left in this submission, | |
2762 | * assuming most submissions are for one file, or at least that each file | |
2763 | * has more than one submission. | |
2764 | */ | |
8da11c19 | 2765 | static struct file *__io_file_get(struct io_submit_state *state, int fd) |
9a56a232 JA |
2766 | { |
2767 | if (!state) | |
2768 | return fget(fd); | |
2769 | ||
2770 | if (state->file) { | |
2771 | if (state->fd == fd) { | |
06ef3608 | 2772 | state->has_refs--; |
9a56a232 JA |
2773 | return state->file; |
2774 | } | |
9f13c35b | 2775 | __io_state_file_put(state); |
9a56a232 JA |
2776 | } |
2777 | state->file = fget_many(fd, state->ios_left); | |
2778 | if (!state->file) | |
2779 | return NULL; | |
2780 | ||
2781 | state->fd = fd; | |
71b547c0 | 2782 | state->has_refs = state->ios_left - 1; |
9a56a232 JA |
2783 | return state->file; |
2784 | } | |
2785 | ||
4503b767 JA |
2786 | static bool io_bdev_nowait(struct block_device *bdev) |
2787 | { | |
2788 | #ifdef CONFIG_BLOCK | |
9ba0d0c8 | 2789 | return !bdev || blk_queue_nowait(bdev_get_queue(bdev)); |
4503b767 JA |
2790 | #else |
2791 | return true; | |
2792 | #endif | |
2793 | } | |
2794 | ||
2b188cc1 JA |
2795 | /* |
2796 | * If we tracked the file through the SCM inflight mechanism, we could support | |
2797 | * any file. For now, just ensure that anything potentially problematic is done | |
2798 | * inline. | |
2799 | */ | |
af197f50 | 2800 | static bool io_file_supports_async(struct file *file, int rw) |
2b188cc1 JA |
2801 | { |
2802 | umode_t mode = file_inode(file)->i_mode; | |
2803 | ||
4503b767 JA |
2804 | if (S_ISBLK(mode)) { |
2805 | if (io_bdev_nowait(file->f_inode->i_bdev)) | |
2806 | return true; | |
2807 | return false; | |
2808 | } | |
2809 | if (S_ISCHR(mode) || S_ISSOCK(mode)) | |
2b188cc1 | 2810 | return true; |
4503b767 JA |
2811 | if (S_ISREG(mode)) { |
2812 | if (io_bdev_nowait(file->f_inode->i_sb->s_bdev) && | |
2813 | file->f_op != &io_uring_fops) | |
2814 | return true; | |
2815 | return false; | |
2816 | } | |
2b188cc1 | 2817 | |
c5b85625 JA |
2818 | /* any ->read/write should understand O_NONBLOCK */ |
2819 | if (file->f_flags & O_NONBLOCK) | |
2820 | return true; | |
2821 | ||
af197f50 JA |
2822 | if (!(file->f_mode & FMODE_NOWAIT)) |
2823 | return false; | |
2824 | ||
2825 | if (rw == READ) | |
2826 | return file->f_op->read_iter != NULL; | |
2827 | ||
2828 | return file->f_op->write_iter != NULL; | |
2b188cc1 JA |
2829 | } |
2830 | ||
a88fc400 | 2831 | static int io_prep_rw(struct io_kiocb *req, const struct io_uring_sqe *sqe) |
2b188cc1 | 2832 | { |
def596e9 | 2833 | struct io_ring_ctx *ctx = req->ctx; |
9adbd45d | 2834 | struct kiocb *kiocb = &req->rw.kiocb; |
09bb8394 JA |
2835 | unsigned ioprio; |
2836 | int ret; | |
2b188cc1 | 2837 | |
491381ce JA |
2838 | if (S_ISREG(file_inode(req->file)->i_mode)) |
2839 | req->flags |= REQ_F_ISREG; | |
2840 | ||
2b188cc1 | 2841 | kiocb->ki_pos = READ_ONCE(sqe->off); |
ba04291e JA |
2842 | if (kiocb->ki_pos == -1 && !(req->file->f_mode & FMODE_STREAM)) { |
2843 | req->flags |= REQ_F_CUR_POS; | |
2844 | kiocb->ki_pos = req->file->f_pos; | |
2845 | } | |
2b188cc1 | 2846 | kiocb->ki_hint = ki_hint_validate(file_write_hint(kiocb->ki_filp)); |
3e577dcd PB |
2847 | kiocb->ki_flags = iocb_flags(kiocb->ki_filp); |
2848 | ret = kiocb_set_rw_flags(kiocb, READ_ONCE(sqe->rw_flags)); | |
2849 | if (unlikely(ret)) | |
2850 | return ret; | |
2b188cc1 JA |
2851 | |
2852 | ioprio = READ_ONCE(sqe->ioprio); | |
2853 | if (ioprio) { | |
2854 | ret = ioprio_check_cap(ioprio); | |
2855 | if (ret) | |
09bb8394 | 2856 | return ret; |
2b188cc1 JA |
2857 | |
2858 | kiocb->ki_ioprio = ioprio; | |
2859 | } else | |
2860 | kiocb->ki_ioprio = get_current_ioprio(); | |
2861 | ||
8449eeda | 2862 | /* don't allow async punt if RWF_NOWAIT was requested */ |
c5b85625 | 2863 | if (kiocb->ki_flags & IOCB_NOWAIT) |
8449eeda SB |
2864 | req->flags |= REQ_F_NOWAIT; |
2865 | ||
def596e9 | 2866 | if (ctx->flags & IORING_SETUP_IOPOLL) { |
def596e9 JA |
2867 | if (!(kiocb->ki_flags & IOCB_DIRECT) || |
2868 | !kiocb->ki_filp->f_op->iopoll) | |
09bb8394 | 2869 | return -EOPNOTSUPP; |
2b188cc1 | 2870 | |
def596e9 JA |
2871 | kiocb->ki_flags |= IOCB_HIPRI; |
2872 | kiocb->ki_complete = io_complete_rw_iopoll; | |
65a6543d | 2873 | req->iopoll_completed = 0; |
def596e9 | 2874 | } else { |
09bb8394 JA |
2875 | if (kiocb->ki_flags & IOCB_HIPRI) |
2876 | return -EINVAL; | |
def596e9 JA |
2877 | kiocb->ki_complete = io_complete_rw; |
2878 | } | |
9adbd45d | 2879 | |
3529d8c2 JA |
2880 | req->rw.addr = READ_ONCE(sqe->addr); |
2881 | req->rw.len = READ_ONCE(sqe->len); | |
4f4eeba8 | 2882 | req->buf_index = READ_ONCE(sqe->buf_index); |
2b188cc1 | 2883 | return 0; |
2b188cc1 JA |
2884 | } |
2885 | ||
2886 | static inline void io_rw_done(struct kiocb *kiocb, ssize_t ret) | |
2887 | { | |
2888 | switch (ret) { | |
2889 | case -EIOCBQUEUED: | |
2890 | break; | |
2891 | case -ERESTARTSYS: | |
2892 | case -ERESTARTNOINTR: | |
2893 | case -ERESTARTNOHAND: | |
2894 | case -ERESTART_RESTARTBLOCK: | |
2895 | /* | |
2896 | * We can't just restart the syscall, since previously | |
2897 | * submitted sqes may already be in progress. Just fail this | |
2898 | * IO with EINTR. | |
2899 | */ | |
2900 | ret = -EINTR; | |
df561f66 | 2901 | fallthrough; |
2b188cc1 JA |
2902 | default: |
2903 | kiocb->ki_complete(kiocb, ret, 0); | |
2904 | } | |
2905 | } | |
2906 | ||
a1d7c393 JA |
2907 | static void kiocb_done(struct kiocb *kiocb, ssize_t ret, |
2908 | struct io_comp_state *cs) | |
ba816ad6 | 2909 | { |
ba04291e | 2910 | struct io_kiocb *req = container_of(kiocb, struct io_kiocb, rw.kiocb); |
e8c2bc1f | 2911 | struct io_async_rw *io = req->async_data; |
ba04291e | 2912 | |
227c0c96 | 2913 | /* add previously done IO, if any */ |
e8c2bc1f | 2914 | if (io && io->bytes_done > 0) { |
227c0c96 | 2915 | if (ret < 0) |
e8c2bc1f | 2916 | ret = io->bytes_done; |
227c0c96 | 2917 | else |
e8c2bc1f | 2918 | ret += io->bytes_done; |
227c0c96 JA |
2919 | } |
2920 | ||
ba04291e JA |
2921 | if (req->flags & REQ_F_CUR_POS) |
2922 | req->file->f_pos = kiocb->ki_pos; | |
bcaec089 | 2923 | if (ret >= 0 && kiocb->ki_complete == io_complete_rw) |
a1d7c393 | 2924 | __io_complete_rw(req, ret, 0, cs); |
ba816ad6 JA |
2925 | else |
2926 | io_rw_done(kiocb, ret); | |
2927 | } | |
2928 | ||
9adbd45d | 2929 | static ssize_t io_import_fixed(struct io_kiocb *req, int rw, |
7d009165 | 2930 | struct iov_iter *iter) |
edafccee | 2931 | { |
9adbd45d JA |
2932 | struct io_ring_ctx *ctx = req->ctx; |
2933 | size_t len = req->rw.len; | |
edafccee | 2934 | struct io_mapped_ubuf *imu; |
4be1c615 | 2935 | u16 index, buf_index = req->buf_index; |
edafccee JA |
2936 | size_t offset; |
2937 | u64 buf_addr; | |
2938 | ||
edafccee JA |
2939 | if (unlikely(buf_index >= ctx->nr_user_bufs)) |
2940 | return -EFAULT; | |
edafccee JA |
2941 | index = array_index_nospec(buf_index, ctx->nr_user_bufs); |
2942 | imu = &ctx->user_bufs[index]; | |
9adbd45d | 2943 | buf_addr = req->rw.addr; |
edafccee JA |
2944 | |
2945 | /* overflow */ | |
2946 | if (buf_addr + len < buf_addr) | |
2947 | return -EFAULT; | |
2948 | /* not inside the mapped region */ | |
2949 | if (buf_addr < imu->ubuf || buf_addr + len > imu->ubuf + imu->len) | |
2950 | return -EFAULT; | |
2951 | ||
2952 | /* | |
2953 | * May not be a start of buffer, set size appropriately | |
2954 | * and advance us to the beginning. | |
2955 | */ | |
2956 | offset = buf_addr - imu->ubuf; | |
2957 | iov_iter_bvec(iter, rw, imu->bvec, imu->nr_bvecs, offset + len); | |
bd11b3a3 JA |
2958 | |
2959 | if (offset) { | |
2960 | /* | |
2961 | * Don't use iov_iter_advance() here, as it's really slow for | |
2962 | * using the latter parts of a big fixed buffer - it iterates | |
2963 | * over each segment manually. We can cheat a bit here, because | |
2964 | * we know that: | |
2965 | * | |
2966 | * 1) it's a BVEC iter, we set it up | |
2967 | * 2) all bvecs are PAGE_SIZE in size, except potentially the | |
2968 | * first and last bvec | |
2969 | * | |
2970 | * So just find our index, and adjust the iterator afterwards. | |
2971 | * If the offset is within the first bvec (or the whole first | |
2972 | * bvec, just use iov_iter_advance(). This makes it easier | |
2973 | * since we can just skip the first segment, which may not | |
2974 | * be PAGE_SIZE aligned. | |
2975 | */ | |
2976 | const struct bio_vec *bvec = imu->bvec; | |
2977 | ||
2978 | if (offset <= bvec->bv_len) { | |
2979 | iov_iter_advance(iter, offset); | |
2980 | } else { | |
2981 | unsigned long seg_skip; | |
2982 | ||
2983 | /* skip first vec */ | |
2984 | offset -= bvec->bv_len; | |
2985 | seg_skip = 1 + (offset >> PAGE_SHIFT); | |
2986 | ||
2987 | iter->bvec = bvec + seg_skip; | |
2988 | iter->nr_segs -= seg_skip; | |
99c79f66 | 2989 | iter->count -= bvec->bv_len + offset; |
bd11b3a3 | 2990 | iter->iov_offset = offset & ~PAGE_MASK; |
bd11b3a3 JA |
2991 | } |
2992 | } | |
2993 | ||
5e559561 | 2994 | return len; |
edafccee JA |
2995 | } |
2996 | ||
bcda7baa JA |
2997 | static void io_ring_submit_unlock(struct io_ring_ctx *ctx, bool needs_lock) |
2998 | { | |
2999 | if (needs_lock) | |
3000 | mutex_unlock(&ctx->uring_lock); | |
3001 | } | |
3002 | ||
3003 | static void io_ring_submit_lock(struct io_ring_ctx *ctx, bool needs_lock) | |
3004 | { | |
3005 | /* | |
3006 | * "Normal" inline submissions always hold the uring_lock, since we | |
3007 | * grab it from the system call. Same is true for the SQPOLL offload. | |
3008 | * The only exception is when we've detached the request and issue it | |
3009 | * from an async worker thread, grab the lock for that case. | |
3010 | */ | |
3011 | if (needs_lock) | |
3012 | mutex_lock(&ctx->uring_lock); | |
3013 | } | |
3014 | ||
3015 | static struct io_buffer *io_buffer_select(struct io_kiocb *req, size_t *len, | |
3016 | int bgid, struct io_buffer *kbuf, | |
3017 | bool needs_lock) | |
3018 | { | |
3019 | struct io_buffer *head; | |
3020 | ||
3021 | if (req->flags & REQ_F_BUFFER_SELECTED) | |
3022 | return kbuf; | |
3023 | ||
3024 | io_ring_submit_lock(req->ctx, needs_lock); | |
3025 | ||
3026 | lockdep_assert_held(&req->ctx->uring_lock); | |
3027 | ||
3028 | head = idr_find(&req->ctx->io_buffer_idr, bgid); | |
3029 | if (head) { | |
3030 | if (!list_empty(&head->list)) { | |
3031 | kbuf = list_last_entry(&head->list, struct io_buffer, | |
3032 | list); | |
3033 | list_del(&kbuf->list); | |
3034 | } else { | |
3035 | kbuf = head; | |
3036 | idr_remove(&req->ctx->io_buffer_idr, bgid); | |
3037 | } | |
3038 | if (*len > kbuf->len) | |
3039 | *len = kbuf->len; | |
3040 | } else { | |
3041 | kbuf = ERR_PTR(-ENOBUFS); | |
3042 | } | |
3043 | ||
3044 | io_ring_submit_unlock(req->ctx, needs_lock); | |
3045 | ||
3046 | return kbuf; | |
3047 | } | |
3048 | ||
4d954c25 JA |
3049 | static void __user *io_rw_buffer_select(struct io_kiocb *req, size_t *len, |
3050 | bool needs_lock) | |
3051 | { | |
3052 | struct io_buffer *kbuf; | |
4f4eeba8 | 3053 | u16 bgid; |
4d954c25 JA |
3054 | |
3055 | kbuf = (struct io_buffer *) (unsigned long) req->rw.addr; | |
4f4eeba8 | 3056 | bgid = req->buf_index; |
4d954c25 JA |
3057 | kbuf = io_buffer_select(req, len, bgid, kbuf, needs_lock); |
3058 | if (IS_ERR(kbuf)) | |
3059 | return kbuf; | |
3060 | req->rw.addr = (u64) (unsigned long) kbuf; | |
3061 | req->flags |= REQ_F_BUFFER_SELECTED; | |
3062 | return u64_to_user_ptr(kbuf->addr); | |
3063 | } | |
3064 | ||
3065 | #ifdef CONFIG_COMPAT | |
3066 | static ssize_t io_compat_import(struct io_kiocb *req, struct iovec *iov, | |
3067 | bool needs_lock) | |
3068 | { | |
3069 | struct compat_iovec __user *uiov; | |
3070 | compat_ssize_t clen; | |
3071 | void __user *buf; | |
3072 | ssize_t len; | |
3073 | ||
3074 | uiov = u64_to_user_ptr(req->rw.addr); | |
3075 | if (!access_ok(uiov, sizeof(*uiov))) | |
3076 | return -EFAULT; | |
3077 | if (__get_user(clen, &uiov->iov_len)) | |
3078 | return -EFAULT; | |
3079 | if (clen < 0) | |
3080 | return -EINVAL; | |
3081 | ||
3082 | len = clen; | |
3083 | buf = io_rw_buffer_select(req, &len, needs_lock); | |
3084 | if (IS_ERR(buf)) | |
3085 | return PTR_ERR(buf); | |
3086 | iov[0].iov_base = buf; | |
3087 | iov[0].iov_len = (compat_size_t) len; | |
3088 | return 0; | |
3089 | } | |
3090 | #endif | |
3091 | ||
3092 | static ssize_t __io_iov_buffer_select(struct io_kiocb *req, struct iovec *iov, | |
3093 | bool needs_lock) | |
3094 | { | |
3095 | struct iovec __user *uiov = u64_to_user_ptr(req->rw.addr); | |
3096 | void __user *buf; | |
3097 | ssize_t len; | |
3098 | ||
3099 | if (copy_from_user(iov, uiov, sizeof(*uiov))) | |
3100 | return -EFAULT; | |
3101 | ||
3102 | len = iov[0].iov_len; | |
3103 | if (len < 0) | |
3104 | return -EINVAL; | |
3105 | buf = io_rw_buffer_select(req, &len, needs_lock); | |
3106 | if (IS_ERR(buf)) | |
3107 | return PTR_ERR(buf); | |
3108 | iov[0].iov_base = buf; | |
3109 | iov[0].iov_len = len; | |
3110 | return 0; | |
3111 | } | |
3112 | ||
3113 | static ssize_t io_iov_buffer_select(struct io_kiocb *req, struct iovec *iov, | |
3114 | bool needs_lock) | |
3115 | { | |
dddb3e26 JA |
3116 | if (req->flags & REQ_F_BUFFER_SELECTED) { |
3117 | struct io_buffer *kbuf; | |
3118 | ||
3119 | kbuf = (struct io_buffer *) (unsigned long) req->rw.addr; | |
3120 | iov[0].iov_base = u64_to_user_ptr(kbuf->addr); | |
3121 | iov[0].iov_len = kbuf->len; | |
4d954c25 | 3122 | return 0; |
dddb3e26 | 3123 | } |
4d954c25 JA |
3124 | if (!req->rw.len) |
3125 | return 0; | |
3126 | else if (req->rw.len > 1) | |
3127 | return -EINVAL; | |
3128 | ||
3129 | #ifdef CONFIG_COMPAT | |
3130 | if (req->ctx->compat) | |
3131 | return io_compat_import(req, iov, needs_lock); | |
3132 | #endif | |
3133 | ||
3134 | return __io_iov_buffer_select(req, iov, needs_lock); | |
3135 | } | |
3136 | ||
8452fd0c JA |
3137 | static ssize_t __io_import_iovec(int rw, struct io_kiocb *req, |
3138 | struct iovec **iovec, struct iov_iter *iter, | |
3139 | bool needs_lock) | |
2b188cc1 | 3140 | { |
9adbd45d JA |
3141 | void __user *buf = u64_to_user_ptr(req->rw.addr); |
3142 | size_t sqe_len = req->rw.len; | |
4d954c25 | 3143 | ssize_t ret; |
edafccee JA |
3144 | u8 opcode; |
3145 | ||
d625c6ee | 3146 | opcode = req->opcode; |
7d009165 | 3147 | if (opcode == IORING_OP_READ_FIXED || opcode == IORING_OP_WRITE_FIXED) { |
edafccee | 3148 | *iovec = NULL; |
9adbd45d | 3149 | return io_import_fixed(req, rw, iter); |
edafccee | 3150 | } |
2b188cc1 | 3151 | |
bcda7baa | 3152 | /* buffer index only valid with fixed read/write, or buffer select */ |
4f4eeba8 | 3153 | if (req->buf_index && !(req->flags & REQ_F_BUFFER_SELECT)) |
9adbd45d JA |
3154 | return -EINVAL; |
3155 | ||
3a6820f2 | 3156 | if (opcode == IORING_OP_READ || opcode == IORING_OP_WRITE) { |
bcda7baa | 3157 | if (req->flags & REQ_F_BUFFER_SELECT) { |
4d954c25 | 3158 | buf = io_rw_buffer_select(req, &sqe_len, needs_lock); |
867a23ea | 3159 | if (IS_ERR(buf)) |
4d954c25 | 3160 | return PTR_ERR(buf); |
3f9d6441 | 3161 | req->rw.len = sqe_len; |
bcda7baa JA |
3162 | } |
3163 | ||
3a6820f2 JA |
3164 | ret = import_single_range(rw, buf, sqe_len, *iovec, iter); |
3165 | *iovec = NULL; | |
3a901598 | 3166 | return ret < 0 ? ret : sqe_len; |
3a6820f2 JA |
3167 | } |
3168 | ||
4d954c25 JA |
3169 | if (req->flags & REQ_F_BUFFER_SELECT) { |
3170 | ret = io_iov_buffer_select(req, *iovec, needs_lock); | |
3f9d6441 JA |
3171 | if (!ret) { |
3172 | ret = (*iovec)->iov_len; | |
3173 | iov_iter_init(iter, rw, *iovec, 1, ret); | |
3174 | } | |
4d954c25 JA |
3175 | *iovec = NULL; |
3176 | return ret; | |
3177 | } | |
3178 | ||
89cd35c5 CH |
3179 | return __import_iovec(rw, buf, sqe_len, UIO_FASTIOV, iovec, iter, |
3180 | req->ctx->compat); | |
2b188cc1 JA |
3181 | } |
3182 | ||
8452fd0c JA |
3183 | static ssize_t io_import_iovec(int rw, struct io_kiocb *req, |
3184 | struct iovec **iovec, struct iov_iter *iter, | |
3185 | bool needs_lock) | |
3186 | { | |
e8c2bc1f JA |
3187 | struct io_async_rw *iorw = req->async_data; |
3188 | ||
3189 | if (!iorw) | |
8452fd0c JA |
3190 | return __io_import_iovec(rw, req, iovec, iter, needs_lock); |
3191 | *iovec = NULL; | |
e8c2bc1f | 3192 | return iov_iter_count(&iorw->iter); |
8452fd0c JA |
3193 | } |
3194 | ||
0fef9483 JA |
3195 | static inline loff_t *io_kiocb_ppos(struct kiocb *kiocb) |
3196 | { | |
5b09e37e | 3197 | return (kiocb->ki_filp->f_mode & FMODE_STREAM) ? NULL : &kiocb->ki_pos; |
0fef9483 JA |
3198 | } |
3199 | ||
31b51510 | 3200 | /* |
32960613 JA |
3201 | * For files that don't have ->read_iter() and ->write_iter(), handle them |
3202 | * by looping over ->read() or ->write() manually. | |
31b51510 | 3203 | */ |
4017eb91 | 3204 | static ssize_t loop_rw_iter(int rw, struct io_kiocb *req, struct iov_iter *iter) |
32960613 | 3205 | { |
4017eb91 JA |
3206 | struct kiocb *kiocb = &req->rw.kiocb; |
3207 | struct file *file = req->file; | |
32960613 JA |
3208 | ssize_t ret = 0; |
3209 | ||
3210 | /* | |
3211 | * Don't support polled IO through this interface, and we can't | |
3212 | * support non-blocking either. For the latter, this just causes | |
3213 | * the kiocb to be handled from an async context. | |
3214 | */ | |
3215 | if (kiocb->ki_flags & IOCB_HIPRI) | |
3216 | return -EOPNOTSUPP; | |
3217 | if (kiocb->ki_flags & IOCB_NOWAIT) | |
3218 | return -EAGAIN; | |
3219 | ||
3220 | while (iov_iter_count(iter)) { | |
311ae9e1 | 3221 | struct iovec iovec; |
32960613 JA |
3222 | ssize_t nr; |
3223 | ||
311ae9e1 PB |
3224 | if (!iov_iter_is_bvec(iter)) { |
3225 | iovec = iov_iter_iovec(iter); | |
3226 | } else { | |
4017eb91 JA |
3227 | iovec.iov_base = u64_to_user_ptr(req->rw.addr); |
3228 | iovec.iov_len = req->rw.len; | |
311ae9e1 PB |
3229 | } |
3230 | ||
32960613 JA |
3231 | if (rw == READ) { |
3232 | nr = file->f_op->read(file, iovec.iov_base, | |
0fef9483 | 3233 | iovec.iov_len, io_kiocb_ppos(kiocb)); |
32960613 JA |
3234 | } else { |
3235 | nr = file->f_op->write(file, iovec.iov_base, | |
0fef9483 | 3236 | iovec.iov_len, io_kiocb_ppos(kiocb)); |
32960613 JA |
3237 | } |
3238 | ||
3239 | if (nr < 0) { | |
3240 | if (!ret) | |
3241 | ret = nr; | |
3242 | break; | |
3243 | } | |
3244 | ret += nr; | |
3245 | if (nr != iovec.iov_len) | |
3246 | break; | |
4017eb91 JA |
3247 | req->rw.len -= nr; |
3248 | req->rw.addr += nr; | |
32960613 JA |
3249 | iov_iter_advance(iter, nr); |
3250 | } | |
3251 | ||
3252 | return ret; | |
3253 | } | |
3254 | ||
ff6165b2 JA |
3255 | static void io_req_map_rw(struct io_kiocb *req, const struct iovec *iovec, |
3256 | const struct iovec *fast_iov, struct iov_iter *iter) | |
f67676d1 | 3257 | { |
e8c2bc1f | 3258 | struct io_async_rw *rw = req->async_data; |
b64e3444 | 3259 | |
ff6165b2 | 3260 | memcpy(&rw->iter, iter, sizeof(*iter)); |
afb87658 | 3261 | rw->free_iovec = iovec; |
227c0c96 | 3262 | rw->bytes_done = 0; |
ff6165b2 JA |
3263 | /* can only be fixed buffers, no need to do anything */ |
3264 | if (iter->type == ITER_BVEC) | |
3265 | return; | |
b64e3444 | 3266 | if (!iovec) { |
ff6165b2 JA |
3267 | unsigned iov_off = 0; |
3268 | ||
3269 | rw->iter.iov = rw->fast_iov; | |
3270 | if (iter->iov != fast_iov) { | |
3271 | iov_off = iter->iov - fast_iov; | |
3272 | rw->iter.iov += iov_off; | |
3273 | } | |
3274 | if (rw->fast_iov != fast_iov) | |
3275 | memcpy(rw->fast_iov + iov_off, fast_iov + iov_off, | |
45097dae | 3276 | sizeof(struct iovec) * iter->nr_segs); |
99bc4c38 PB |
3277 | } else { |
3278 | req->flags |= REQ_F_NEED_CLEANUP; | |
f67676d1 JA |
3279 | } |
3280 | } | |
3281 | ||
e8c2bc1f | 3282 | static inline int __io_alloc_async_data(struct io_kiocb *req) |
3d9932a8 | 3283 | { |
e8c2bc1f JA |
3284 | WARN_ON_ONCE(!io_op_defs[req->opcode].async_size); |
3285 | req->async_data = kmalloc(io_op_defs[req->opcode].async_size, GFP_KERNEL); | |
3286 | return req->async_data == NULL; | |
3d9932a8 XW |
3287 | } |
3288 | ||
e8c2bc1f | 3289 | static int io_alloc_async_data(struct io_kiocb *req) |
f67676d1 | 3290 | { |
e8c2bc1f | 3291 | if (!io_op_defs[req->opcode].needs_async_data) |
d3656344 | 3292 | return 0; |
3d9932a8 | 3293 | |
e8c2bc1f | 3294 | return __io_alloc_async_data(req); |
b7bb4f7d JA |
3295 | } |
3296 | ||
ff6165b2 JA |
3297 | static int io_setup_async_rw(struct io_kiocb *req, const struct iovec *iovec, |
3298 | const struct iovec *fast_iov, | |
227c0c96 | 3299 | struct iov_iter *iter, bool force) |
b7bb4f7d | 3300 | { |
e8c2bc1f | 3301 | if (!force && !io_op_defs[req->opcode].needs_async_data) |
74566df3 | 3302 | return 0; |
e8c2bc1f JA |
3303 | if (!req->async_data) { |
3304 | if (__io_alloc_async_data(req)) | |
5d204bcf | 3305 | return -ENOMEM; |
b7bb4f7d | 3306 | |
ff6165b2 | 3307 | io_req_map_rw(req, iovec, fast_iov, iter); |
5d204bcf | 3308 | } |
b7bb4f7d | 3309 | return 0; |
f67676d1 JA |
3310 | } |
3311 | ||
73debe68 | 3312 | static inline int io_rw_prep_async(struct io_kiocb *req, int rw) |
c3e330a4 | 3313 | { |
e8c2bc1f | 3314 | struct io_async_rw *iorw = req->async_data; |
f4bff104 | 3315 | struct iovec *iov = iorw->fast_iov; |
c3e330a4 PB |
3316 | ssize_t ret; |
3317 | ||
73debe68 | 3318 | ret = __io_import_iovec(rw, req, &iov, &iorw->iter, false); |
c3e330a4 PB |
3319 | if (unlikely(ret < 0)) |
3320 | return ret; | |
3321 | ||
ab0b196c PB |
3322 | iorw->bytes_done = 0; |
3323 | iorw->free_iovec = iov; | |
3324 | if (iov) | |
3325 | req->flags |= REQ_F_NEED_CLEANUP; | |
c3e330a4 PB |
3326 | return 0; |
3327 | } | |
3328 | ||
73debe68 | 3329 | static int io_read_prep(struct io_kiocb *req, const struct io_uring_sqe *sqe) |
f67676d1 JA |
3330 | { |
3331 | ssize_t ret; | |
3332 | ||
a88fc400 | 3333 | ret = io_prep_rw(req, sqe); |
3529d8c2 JA |
3334 | if (ret) |
3335 | return ret; | |
f67676d1 | 3336 | |
3529d8c2 JA |
3337 | if (unlikely(!(req->file->f_mode & FMODE_READ))) |
3338 | return -EBADF; | |
f67676d1 | 3339 | |
5f798bea | 3340 | /* either don't need iovec imported or already have it */ |
2d199895 | 3341 | if (!req->async_data) |
3529d8c2 | 3342 | return 0; |
73debe68 | 3343 | return io_rw_prep_async(req, READ); |
f67676d1 JA |
3344 | } |
3345 | ||
c1dd91d1 JA |
3346 | /* |
3347 | * This is our waitqueue callback handler, registered through lock_page_async() | |
3348 | * when we initially tried to do the IO with the iocb armed our waitqueue. | |
3349 | * This gets called when the page is unlocked, and we generally expect that to | |
3350 | * happen when the page IO is completed and the page is now uptodate. This will | |
3351 | * queue a task_work based retry of the operation, attempting to copy the data | |
3352 | * again. If the latter fails because the page was NOT uptodate, then we will | |
3353 | * do a thread based blocking retry of the operation. That's the unexpected | |
3354 | * slow path. | |
3355 | */ | |
bcf5a063 JA |
3356 | static int io_async_buf_func(struct wait_queue_entry *wait, unsigned mode, |
3357 | int sync, void *arg) | |
3358 | { | |
3359 | struct wait_page_queue *wpq; | |
3360 | struct io_kiocb *req = wait->private; | |
bcf5a063 | 3361 | struct wait_page_key *key = arg; |
bcf5a063 JA |
3362 | int ret; |
3363 | ||
3364 | wpq = container_of(wait, struct wait_page_queue, wait); | |
3365 | ||
cdc8fcb4 LT |
3366 | if (!wake_page_match(wpq, key)) |
3367 | return 0; | |
3368 | ||
c8d317aa | 3369 | req->rw.kiocb.ki_flags &= ~IOCB_WAITQ; |
bcf5a063 JA |
3370 | list_del_init(&wait->entry); |
3371 | ||
e7375122 | 3372 | init_task_work(&req->task_work, io_req_task_submit); |
6d816e08 JA |
3373 | percpu_ref_get(&req->ctx->refs); |
3374 | ||
bcf5a063 JA |
3375 | /* submit ref gets dropped, acquire a new one */ |
3376 | refcount_inc(&req->refs); | |
87c4311f | 3377 | ret = io_req_task_work_add(req, true); |
bcf5a063 | 3378 | if (unlikely(ret)) { |
c2c4c83c JA |
3379 | struct task_struct *tsk; |
3380 | ||
bcf5a063 | 3381 | /* queue just for cancelation */ |
e7375122 | 3382 | init_task_work(&req->task_work, io_req_task_cancel); |
bcf5a063 | 3383 | tsk = io_wq_get_task(req->ctx->io_wq); |
91989c70 | 3384 | task_work_add(tsk, &req->task_work, TWA_NONE); |
c2c4c83c | 3385 | wake_up_process(tsk); |
bcf5a063 | 3386 | } |
bcf5a063 JA |
3387 | return 1; |
3388 | } | |
3389 | ||
c1dd91d1 JA |
3390 | /* |
3391 | * This controls whether a given IO request should be armed for async page | |
3392 | * based retry. If we return false here, the request is handed to the async | |
3393 | * worker threads for retry. If we're doing buffered reads on a regular file, | |
3394 | * we prepare a private wait_page_queue entry and retry the operation. This | |
3395 | * will either succeed because the page is now uptodate and unlocked, or it | |
3396 | * will register a callback when the page is unlocked at IO completion. Through | |
3397 | * that callback, io_uring uses task_work to setup a retry of the operation. | |
3398 | * That retry will attempt the buffered read again. The retry will generally | |
3399 | * succeed, or in rare cases where it fails, we then fall back to using the | |
3400 | * async worker threads for a blocking retry. | |
3401 | */ | |
227c0c96 | 3402 | static bool io_rw_should_retry(struct io_kiocb *req) |
f67676d1 | 3403 | { |
e8c2bc1f JA |
3404 | struct io_async_rw *rw = req->async_data; |
3405 | struct wait_page_queue *wait = &rw->wpq; | |
bcf5a063 | 3406 | struct kiocb *kiocb = &req->rw.kiocb; |
f67676d1 | 3407 | |
bcf5a063 JA |
3408 | /* never retry for NOWAIT, we just complete with -EAGAIN */ |
3409 | if (req->flags & REQ_F_NOWAIT) | |
3410 | return false; | |
f67676d1 | 3411 | |
227c0c96 | 3412 | /* Only for buffered IO */ |
3b2a4439 | 3413 | if (kiocb->ki_flags & (IOCB_DIRECT | IOCB_HIPRI)) |
bcf5a063 | 3414 | return false; |
3b2a4439 | 3415 | |
bcf5a063 JA |
3416 | /* |
3417 | * just use poll if we can, and don't attempt if the fs doesn't | |
3418 | * support callback based unlocks | |
3419 | */ | |
3420 | if (file_can_poll(req->file) || !(req->file->f_mode & FMODE_BUF_RASYNC)) | |
3421 | return false; | |
f67676d1 | 3422 | |
3b2a4439 JA |
3423 | wait->wait.func = io_async_buf_func; |
3424 | wait->wait.private = req; | |
3425 | wait->wait.flags = 0; | |
3426 | INIT_LIST_HEAD(&wait->wait.entry); | |
3427 | kiocb->ki_flags |= IOCB_WAITQ; | |
c8d317aa | 3428 | kiocb->ki_flags &= ~IOCB_NOWAIT; |
3b2a4439 | 3429 | kiocb->ki_waitq = wait; |
3b2a4439 | 3430 | return true; |
bcf5a063 JA |
3431 | } |
3432 | ||
3433 | static int io_iter_do_read(struct io_kiocb *req, struct iov_iter *iter) | |
3434 | { | |
3435 | if (req->file->f_op->read_iter) | |
3436 | return call_read_iter(req->file, &req->rw.kiocb, iter); | |
2dd2111d | 3437 | else if (req->file->f_op->read) |
4017eb91 | 3438 | return loop_rw_iter(READ, req, iter); |
2dd2111d GH |
3439 | else |
3440 | return -EINVAL; | |
f67676d1 JA |
3441 | } |
3442 | ||
a1d7c393 JA |
3443 | static int io_read(struct io_kiocb *req, bool force_nonblock, |
3444 | struct io_comp_state *cs) | |
2b188cc1 JA |
3445 | { |
3446 | struct iovec inline_vecs[UIO_FASTIOV], *iovec = inline_vecs; | |
9adbd45d | 3447 | struct kiocb *kiocb = &req->rw.kiocb; |
ff6165b2 | 3448 | struct iov_iter __iter, *iter = &__iter; |
e8c2bc1f | 3449 | struct io_async_rw *rw = req->async_data; |
227c0c96 | 3450 | ssize_t io_size, ret, ret2; |
31b51510 | 3451 | size_t iov_count; |
f5cac8b1 | 3452 | bool no_async; |
ff6165b2 | 3453 | |
e8c2bc1f JA |
3454 | if (rw) |
3455 | iter = &rw->iter; | |
2b188cc1 | 3456 | |
ff6165b2 | 3457 | ret = io_import_iovec(READ, req, &iovec, iter, !force_nonblock); |
06b76d44 JA |
3458 | if (ret < 0) |
3459 | return ret; | |
eefdf30f | 3460 | iov_count = iov_iter_count(iter); |
fa15bafb PB |
3461 | io_size = ret; |
3462 | req->result = io_size; | |
227c0c96 | 3463 | ret = 0; |
2b188cc1 | 3464 | |
fd6c2e4c JA |
3465 | /* Ensure we clear previously set non-block flag */ |
3466 | if (!force_nonblock) | |
29de5f6a | 3467 | kiocb->ki_flags &= ~IOCB_NOWAIT; |
a88fc400 PB |
3468 | else |
3469 | kiocb->ki_flags |= IOCB_NOWAIT; | |
3470 | ||
fd6c2e4c | 3471 | |
24c74678 | 3472 | /* If the file doesn't support async, just async punt */ |
f5cac8b1 JA |
3473 | no_async = force_nonblock && !io_file_supports_async(req->file, READ); |
3474 | if (no_async) | |
f67676d1 | 3475 | goto copy_iov; |
9e645e11 | 3476 | |
0fef9483 | 3477 | ret = rw_verify_area(READ, req->file, io_kiocb_ppos(kiocb), iov_count); |
fa15bafb PB |
3478 | if (unlikely(ret)) |
3479 | goto out_free; | |
2b188cc1 | 3480 | |
227c0c96 | 3481 | ret = io_iter_do_read(req, iter); |
32960613 | 3482 | |
227c0c96 JA |
3483 | if (!ret) { |
3484 | goto done; | |
3485 | } else if (ret == -EIOCBQUEUED) { | |
3486 | ret = 0; | |
3487 | goto out_free; | |
3488 | } else if (ret == -EAGAIN) { | |
eefdf30f JA |
3489 | /* IOPOLL retry should happen for io-wq threads */ |
3490 | if (!force_nonblock && !(req->ctx->flags & IORING_SETUP_IOPOLL)) | |
f91daf56 | 3491 | goto done; |
355afaeb JA |
3492 | /* no retry on NONBLOCK marked file */ |
3493 | if (req->file->f_flags & O_NONBLOCK) | |
3494 | goto done; | |
84216315 JA |
3495 | /* some cases will consume bytes even on error returns */ |
3496 | iov_iter_revert(iter, iov_count - iov_iter_count(iter)); | |
f38c7e3a JA |
3497 | ret = 0; |
3498 | goto copy_iov; | |
227c0c96 | 3499 | } else if (ret < 0) { |
00d23d51 JA |
3500 | /* make sure -ERESTARTSYS -> -EINTR is done */ |
3501 | goto done; | |
227c0c96 JA |
3502 | } |
3503 | ||
3504 | /* read it all, or we did blocking attempt. no retry. */ | |
f91daf56 JA |
3505 | if (!iov_iter_count(iter) || !force_nonblock || |
3506 | (req->file->f_flags & O_NONBLOCK)) | |
227c0c96 JA |
3507 | goto done; |
3508 | ||
3509 | io_size -= ret; | |
3510 | copy_iov: | |
3511 | ret2 = io_setup_async_rw(req, iovec, inline_vecs, iter, true); | |
3512 | if (ret2) { | |
3513 | ret = ret2; | |
3514 | goto out_free; | |
3515 | } | |
f5cac8b1 JA |
3516 | if (no_async) |
3517 | return -EAGAIN; | |
e8c2bc1f | 3518 | rw = req->async_data; |
227c0c96 JA |
3519 | /* it's copied and will be cleaned with ->io */ |
3520 | iovec = NULL; | |
3521 | /* now use our persistent iterator, if we aren't already */ | |
e8c2bc1f | 3522 | iter = &rw->iter; |
227c0c96 | 3523 | retry: |
e8c2bc1f | 3524 | rw->bytes_done += ret; |
227c0c96 JA |
3525 | /* if we can retry, do so with the callbacks armed */ |
3526 | if (!io_rw_should_retry(req)) { | |
fa15bafb PB |
3527 | kiocb->ki_flags &= ~IOCB_WAITQ; |
3528 | return -EAGAIN; | |
2b188cc1 | 3529 | } |
227c0c96 JA |
3530 | |
3531 | /* | |
3532 | * Now retry read with the IOCB_WAITQ parts set in the iocb. If we | |
3533 | * get -EIOCBQUEUED, then we'll get a notification when the desired | |
3534 | * page gets unlocked. We can also get a partial read here, and if we | |
3535 | * do, then just retry at the new offset. | |
3536 | */ | |
3537 | ret = io_iter_do_read(req, iter); | |
3538 | if (ret == -EIOCBQUEUED) { | |
3539 | ret = 0; | |
3540 | goto out_free; | |
3541 | } else if (ret > 0 && ret < io_size) { | |
3542 | /* we got some bytes, but not all. retry. */ | |
3543 | goto retry; | |
3544 | } | |
3545 | done: | |
3546 | kiocb_done(kiocb, ret, cs); | |
3547 | ret = 0; | |
f67676d1 | 3548 | out_free: |
f261c168 | 3549 | /* it's reportedly faster than delegating the null check to kfree() */ |
252917c3 | 3550 | if (iovec) |
6f2cc166 | 3551 | kfree(iovec); |
2b188cc1 JA |
3552 | return ret; |
3553 | } | |
3554 | ||
73debe68 | 3555 | static int io_write_prep(struct io_kiocb *req, const struct io_uring_sqe *sqe) |
f67676d1 JA |
3556 | { |
3557 | ssize_t ret; | |
3558 | ||
a88fc400 | 3559 | ret = io_prep_rw(req, sqe); |
3529d8c2 JA |
3560 | if (ret) |
3561 | return ret; | |
f67676d1 | 3562 | |
3529d8c2 JA |
3563 | if (unlikely(!(req->file->f_mode & FMODE_WRITE))) |
3564 | return -EBADF; | |
f67676d1 | 3565 | |
5f798bea | 3566 | /* either don't need iovec imported or already have it */ |
2d199895 | 3567 | if (!req->async_data) |
3529d8c2 | 3568 | return 0; |
73debe68 | 3569 | return io_rw_prep_async(req, WRITE); |
f67676d1 JA |
3570 | } |
3571 | ||
a1d7c393 JA |
3572 | static int io_write(struct io_kiocb *req, bool force_nonblock, |
3573 | struct io_comp_state *cs) | |
2b188cc1 JA |
3574 | { |
3575 | struct iovec inline_vecs[UIO_FASTIOV], *iovec = inline_vecs; | |
9adbd45d | 3576 | struct kiocb *kiocb = &req->rw.kiocb; |
ff6165b2 | 3577 | struct iov_iter __iter, *iter = &__iter; |
e8c2bc1f | 3578 | struct io_async_rw *rw = req->async_data; |
31b51510 | 3579 | size_t iov_count; |
fa15bafb | 3580 | ssize_t ret, ret2, io_size; |
2b188cc1 | 3581 | |
e8c2bc1f JA |
3582 | if (rw) |
3583 | iter = &rw->iter; | |
ff6165b2 JA |
3584 | |
3585 | ret = io_import_iovec(WRITE, req, &iovec, iter, !force_nonblock); | |
06b76d44 JA |
3586 | if (ret < 0) |
3587 | return ret; | |
eefdf30f | 3588 | iov_count = iov_iter_count(iter); |
fa15bafb PB |
3589 | io_size = ret; |
3590 | req->result = io_size; | |
2b188cc1 | 3591 | |
fd6c2e4c JA |
3592 | /* Ensure we clear previously set non-block flag */ |
3593 | if (!force_nonblock) | |
a88fc400 PB |
3594 | kiocb->ki_flags &= ~IOCB_NOWAIT; |
3595 | else | |
3596 | kiocb->ki_flags |= IOCB_NOWAIT; | |
fd6c2e4c | 3597 | |
24c74678 | 3598 | /* If the file doesn't support async, just async punt */ |
af197f50 | 3599 | if (force_nonblock && !io_file_supports_async(req->file, WRITE)) |
f67676d1 | 3600 | goto copy_iov; |
31b51510 | 3601 | |
10d59345 JA |
3602 | /* file path doesn't support NOWAIT for non-direct_IO */ |
3603 | if (force_nonblock && !(kiocb->ki_flags & IOCB_DIRECT) && | |
3604 | (req->flags & REQ_F_ISREG)) | |
f67676d1 | 3605 | goto copy_iov; |
31b51510 | 3606 | |
0fef9483 | 3607 | ret = rw_verify_area(WRITE, req->file, io_kiocb_ppos(kiocb), iov_count); |
fa15bafb PB |
3608 | if (unlikely(ret)) |
3609 | goto out_free; | |
4ed734b0 | 3610 | |
fa15bafb PB |
3611 | /* |
3612 | * Open-code file_start_write here to grab freeze protection, | |
3613 | * which will be released by another thread in | |
3614 | * io_complete_rw(). Fool lockdep by telling it the lock got | |
3615 | * released so that it doesn't complain about the held lock when | |
3616 | * we return to userspace. | |
3617 | */ | |
3618 | if (req->flags & REQ_F_ISREG) { | |
8a3c84b6 | 3619 | sb_start_write(file_inode(req->file)->i_sb); |
fa15bafb PB |
3620 | __sb_writers_release(file_inode(req->file)->i_sb, |
3621 | SB_FREEZE_WRITE); | |
3622 | } | |
3623 | kiocb->ki_flags |= IOCB_WRITE; | |
4ed734b0 | 3624 | |
fa15bafb | 3625 | if (req->file->f_op->write_iter) |
ff6165b2 | 3626 | ret2 = call_write_iter(req->file, kiocb, iter); |
2dd2111d | 3627 | else if (req->file->f_op->write) |
4017eb91 | 3628 | ret2 = loop_rw_iter(WRITE, req, iter); |
2dd2111d GH |
3629 | else |
3630 | ret2 = -EINVAL; | |
4ed734b0 | 3631 | |
fa15bafb PB |
3632 | /* |
3633 | * Raw bdev writes will return -EOPNOTSUPP for IOCB_NOWAIT. Just | |
3634 | * retry them without IOCB_NOWAIT. | |
3635 | */ | |
3636 | if (ret2 == -EOPNOTSUPP && (kiocb->ki_flags & IOCB_NOWAIT)) | |
3637 | ret2 = -EAGAIN; | |
355afaeb JA |
3638 | /* no retry on NONBLOCK marked file */ |
3639 | if (ret2 == -EAGAIN && (req->file->f_flags & O_NONBLOCK)) | |
3640 | goto done; | |
fa15bafb | 3641 | if (!force_nonblock || ret2 != -EAGAIN) { |
eefdf30f JA |
3642 | /* IOPOLL retry should happen for io-wq threads */ |
3643 | if ((req->ctx->flags & IORING_SETUP_IOPOLL) && ret2 == -EAGAIN) | |
3644 | goto copy_iov; | |
355afaeb | 3645 | done: |
fa15bafb PB |
3646 | kiocb_done(kiocb, ret2, cs); |
3647 | } else { | |
f67676d1 | 3648 | copy_iov: |
84216315 JA |
3649 | /* some cases will consume bytes even on error returns */ |
3650 | iov_iter_revert(iter, iov_count - iov_iter_count(iter)); | |
227c0c96 | 3651 | ret = io_setup_async_rw(req, iovec, inline_vecs, iter, false); |
ff6165b2 JA |
3652 | if (!ret) |
3653 | return -EAGAIN; | |
2b188cc1 | 3654 | } |
31b51510 | 3655 | out_free: |
f261c168 | 3656 | /* it's reportedly faster than delegating the null check to kfree() */ |
252917c3 | 3657 | if (iovec) |
6f2cc166 | 3658 | kfree(iovec); |
2b188cc1 JA |
3659 | return ret; |
3660 | } | |
3661 | ||
80a261fd JA |
3662 | static int io_renameat_prep(struct io_kiocb *req, |
3663 | const struct io_uring_sqe *sqe) | |
3664 | { | |
3665 | struct io_rename *ren = &req->rename; | |
3666 | const char __user *oldf, *newf; | |
3667 | ||
3668 | if (unlikely(req->flags & REQ_F_FIXED_FILE)) | |
3669 | return -EBADF; | |
3670 | ||
3671 | ren->old_dfd = READ_ONCE(sqe->fd); | |
3672 | oldf = u64_to_user_ptr(READ_ONCE(sqe->addr)); | |
3673 | newf = u64_to_user_ptr(READ_ONCE(sqe->addr2)); | |
3674 | ren->new_dfd = READ_ONCE(sqe->len); | |
3675 | ren->flags = READ_ONCE(sqe->rename_flags); | |
3676 | ||
3677 | ren->oldpath = getname(oldf); | |
3678 | if (IS_ERR(ren->oldpath)) | |
3679 | return PTR_ERR(ren->oldpath); | |
3680 | ||
3681 | ren->newpath = getname(newf); | |
3682 | if (IS_ERR(ren->newpath)) { | |
3683 | putname(ren->oldpath); | |
3684 | return PTR_ERR(ren->newpath); | |
3685 | } | |
3686 | ||
3687 | req->flags |= REQ_F_NEED_CLEANUP; | |
3688 | return 0; | |
3689 | } | |
3690 | ||
3691 | static int io_renameat(struct io_kiocb *req, bool force_nonblock) | |
3692 | { | |
3693 | struct io_rename *ren = &req->rename; | |
3694 | int ret; | |
3695 | ||
3696 | if (force_nonblock) | |
3697 | return -EAGAIN; | |
3698 | ||
3699 | ret = do_renameat2(ren->old_dfd, ren->oldpath, ren->new_dfd, | |
3700 | ren->newpath, ren->flags); | |
3701 | ||
3702 | req->flags &= ~REQ_F_NEED_CLEANUP; | |
3703 | if (ret < 0) | |
3704 | req_set_fail_links(req); | |
3705 | io_req_complete(req, ret); | |
3706 | return 0; | |
3707 | } | |
3708 | ||
36f4fa68 JA |
3709 | static int io_shutdown_prep(struct io_kiocb *req, |
3710 | const struct io_uring_sqe *sqe) | |
3711 | { | |
3712 | #if defined(CONFIG_NET) | |
3713 | if (unlikely(req->ctx->flags & IORING_SETUP_IOPOLL)) | |
3714 | return -EINVAL; | |
3715 | if (sqe->ioprio || sqe->off || sqe->addr || sqe->rw_flags || | |
3716 | sqe->buf_index) | |
3717 | return -EINVAL; | |
3718 | ||
3719 | req->shutdown.how = READ_ONCE(sqe->len); | |
3720 | return 0; | |
3721 | #else | |
3722 | return -EOPNOTSUPP; | |
3723 | #endif | |
3724 | } | |
3725 | ||
3726 | static int io_shutdown(struct io_kiocb *req, bool force_nonblock) | |
3727 | { | |
3728 | #if defined(CONFIG_NET) | |
3729 | struct socket *sock; | |
3730 | int ret; | |
3731 | ||
3732 | if (force_nonblock) | |
3733 | return -EAGAIN; | |
3734 | ||
3735 | sock = sock_from_file(req->file, &ret); | |
3736 | if (unlikely(!sock)) | |
3737 | return ret; | |
3738 | ||
3739 | ret = __sys_shutdown_sock(sock, req->shutdown.how); | |
3740 | io_req_complete(req, ret); | |
3741 | return 0; | |
3742 | #else | |
3743 | return -EOPNOTSUPP; | |
3744 | #endif | |
3745 | } | |
3746 | ||
f2a8d5c7 PB |
3747 | static int __io_splice_prep(struct io_kiocb *req, |
3748 | const struct io_uring_sqe *sqe) | |
7d67af2c PB |
3749 | { |
3750 | struct io_splice* sp = &req->splice; | |
3751 | unsigned int valid_flags = SPLICE_F_FD_IN_FIXED | SPLICE_F_ALL; | |
7d67af2c | 3752 | |
3232dd02 PB |
3753 | if (unlikely(req->ctx->flags & IORING_SETUP_IOPOLL)) |
3754 | return -EINVAL; | |
7d67af2c PB |
3755 | |
3756 | sp->file_in = NULL; | |
7d67af2c PB |
3757 | sp->len = READ_ONCE(sqe->len); |
3758 | sp->flags = READ_ONCE(sqe->splice_flags); | |
3759 | ||
3760 | if (unlikely(sp->flags & ~valid_flags)) | |
3761 | return -EINVAL; | |
3762 | ||
8371adf5 PB |
3763 | sp->file_in = io_file_get(NULL, req, READ_ONCE(sqe->splice_fd_in), |
3764 | (sp->flags & SPLICE_F_FD_IN_FIXED)); | |
3765 | if (!sp->file_in) | |
3766 | return -EBADF; | |
7d67af2c PB |
3767 | req->flags |= REQ_F_NEED_CLEANUP; |
3768 | ||
7cdaf587 XW |
3769 | if (!S_ISREG(file_inode(sp->file_in)->i_mode)) { |
3770 | /* | |
3771 | * Splice operation will be punted aync, and here need to | |
3772 | * modify io_wq_work.flags, so initialize io_wq_work firstly. | |
3773 | */ | |
3774 | io_req_init_async(req); | |
7d67af2c | 3775 | req->work.flags |= IO_WQ_WORK_UNBOUND; |
7cdaf587 | 3776 | } |
7d67af2c PB |
3777 | |
3778 | return 0; | |
3779 | } | |
3780 | ||
f2a8d5c7 PB |
3781 | static int io_tee_prep(struct io_kiocb *req, |
3782 | const struct io_uring_sqe *sqe) | |
3783 | { | |
3784 | if (READ_ONCE(sqe->splice_off_in) || READ_ONCE(sqe->off)) | |
3785 | return -EINVAL; | |
3786 | return __io_splice_prep(req, sqe); | |
3787 | } | |
3788 | ||
3789 | static int io_tee(struct io_kiocb *req, bool force_nonblock) | |
3790 | { | |
3791 | struct io_splice *sp = &req->splice; | |
3792 | struct file *in = sp->file_in; | |
3793 | struct file *out = sp->file_out; | |
3794 | unsigned int flags = sp->flags & ~SPLICE_F_FD_IN_FIXED; | |
3795 | long ret = 0; | |
3796 | ||
3797 | if (force_nonblock) | |
3798 | return -EAGAIN; | |
3799 | if (sp->len) | |
3800 | ret = do_tee(in, out, sp->len, flags); | |
3801 | ||
3802 | io_put_file(req, in, (sp->flags & SPLICE_F_FD_IN_FIXED)); | |
3803 | req->flags &= ~REQ_F_NEED_CLEANUP; | |
3804 | ||
f2a8d5c7 PB |
3805 | if (ret != sp->len) |
3806 | req_set_fail_links(req); | |
e1e16097 | 3807 | io_req_complete(req, ret); |
f2a8d5c7 PB |
3808 | return 0; |
3809 | } | |
3810 | ||
3811 | static int io_splice_prep(struct io_kiocb *req, const struct io_uring_sqe *sqe) | |
3812 | { | |
3813 | struct io_splice* sp = &req->splice; | |
3814 | ||
3815 | sp->off_in = READ_ONCE(sqe->splice_off_in); | |
3816 | sp->off_out = READ_ONCE(sqe->off); | |
3817 | return __io_splice_prep(req, sqe); | |
3818 | } | |
3819 | ||
014db007 | 3820 | static int io_splice(struct io_kiocb *req, bool force_nonblock) |
7d67af2c PB |
3821 | { |
3822 | struct io_splice *sp = &req->splice; | |
3823 | struct file *in = sp->file_in; | |
3824 | struct file *out = sp->file_out; | |
3825 | unsigned int flags = sp->flags & ~SPLICE_F_FD_IN_FIXED; | |
3826 | loff_t *poff_in, *poff_out; | |
c9687426 | 3827 | long ret = 0; |
7d67af2c | 3828 | |
2fb3e822 PB |
3829 | if (force_nonblock) |
3830 | return -EAGAIN; | |
7d67af2c PB |
3831 | |
3832 | poff_in = (sp->off_in == -1) ? NULL : &sp->off_in; | |
3833 | poff_out = (sp->off_out == -1) ? NULL : &sp->off_out; | |
c9687426 | 3834 | |
948a7749 | 3835 | if (sp->len) |
c9687426 | 3836 | ret = do_splice(in, poff_in, out, poff_out, sp->len, flags); |
7d67af2c PB |
3837 | |
3838 | io_put_file(req, in, (sp->flags & SPLICE_F_FD_IN_FIXED)); | |
3839 | req->flags &= ~REQ_F_NEED_CLEANUP; | |
3840 | ||
7d67af2c PB |
3841 | if (ret != sp->len) |
3842 | req_set_fail_links(req); | |
e1e16097 | 3843 | io_req_complete(req, ret); |
7d67af2c PB |
3844 | return 0; |
3845 | } | |
3846 | ||
2b188cc1 JA |
3847 | /* |
3848 | * IORING_OP_NOP just posts a completion event, nothing else. | |
3849 | */ | |
229a7b63 | 3850 | static int io_nop(struct io_kiocb *req, struct io_comp_state *cs) |
2b188cc1 JA |
3851 | { |
3852 | struct io_ring_ctx *ctx = req->ctx; | |
2b188cc1 | 3853 | |
def596e9 JA |
3854 | if (unlikely(ctx->flags & IORING_SETUP_IOPOLL)) |
3855 | return -EINVAL; | |
3856 | ||
229a7b63 | 3857 | __io_req_complete(req, 0, 0, cs); |
2b188cc1 JA |
3858 | return 0; |
3859 | } | |
3860 | ||
3529d8c2 | 3861 | static int io_prep_fsync(struct io_kiocb *req, const struct io_uring_sqe *sqe) |
c992fe29 | 3862 | { |
6b06314c | 3863 | struct io_ring_ctx *ctx = req->ctx; |
c992fe29 | 3864 | |
09bb8394 JA |
3865 | if (!req->file) |
3866 | return -EBADF; | |
c992fe29 | 3867 | |
6b06314c | 3868 | if (unlikely(ctx->flags & IORING_SETUP_IOPOLL)) |
def596e9 | 3869 | return -EINVAL; |
edafccee | 3870 | if (unlikely(sqe->addr || sqe->ioprio || sqe->buf_index)) |
c992fe29 CH |
3871 | return -EINVAL; |
3872 | ||
8ed8d3c3 JA |
3873 | req->sync.flags = READ_ONCE(sqe->fsync_flags); |
3874 | if (unlikely(req->sync.flags & ~IORING_FSYNC_DATASYNC)) | |
3875 | return -EINVAL; | |
3876 | ||
3877 | req->sync.off = READ_ONCE(sqe->off); | |
3878 | req->sync.len = READ_ONCE(sqe->len); | |
c992fe29 CH |
3879 | return 0; |
3880 | } | |
3881 | ||
ac45abc0 | 3882 | static int io_fsync(struct io_kiocb *req, bool force_nonblock) |
8ed8d3c3 | 3883 | { |
8ed8d3c3 | 3884 | loff_t end = req->sync.off + req->sync.len; |
8ed8d3c3 JA |
3885 | int ret; |
3886 | ||
ac45abc0 PB |
3887 | /* fsync always requires a blocking context */ |
3888 | if (force_nonblock) | |
3889 | return -EAGAIN; | |
3890 | ||
9adbd45d | 3891 | ret = vfs_fsync_range(req->file, req->sync.off, |
8ed8d3c3 JA |
3892 | end > 0 ? end : LLONG_MAX, |
3893 | req->sync.flags & IORING_FSYNC_DATASYNC); | |
3894 | if (ret < 0) | |
3895 | req_set_fail_links(req); | |
e1e16097 | 3896 | io_req_complete(req, ret); |
c992fe29 CH |
3897 | return 0; |
3898 | } | |
3899 | ||
d63d1b5e JA |
3900 | static int io_fallocate_prep(struct io_kiocb *req, |
3901 | const struct io_uring_sqe *sqe) | |
3902 | { | |
3903 | if (sqe->ioprio || sqe->buf_index || sqe->rw_flags) | |
3904 | return -EINVAL; | |
3232dd02 PB |
3905 | if (unlikely(req->ctx->flags & IORING_SETUP_IOPOLL)) |
3906 | return -EINVAL; | |
d63d1b5e JA |
3907 | |
3908 | req->sync.off = READ_ONCE(sqe->off); | |
3909 | req->sync.len = READ_ONCE(sqe->addr); | |
3910 | req->sync.mode = READ_ONCE(sqe->len); | |
3911 | return 0; | |
3912 | } | |
3913 | ||
014db007 | 3914 | static int io_fallocate(struct io_kiocb *req, bool force_nonblock) |
5d17b4a4 | 3915 | { |
ac45abc0 PB |
3916 | int ret; |
3917 | ||
d63d1b5e | 3918 | /* fallocate always requiring blocking context */ |
ac45abc0 | 3919 | if (force_nonblock) |
5d17b4a4 | 3920 | return -EAGAIN; |
ac45abc0 PB |
3921 | ret = vfs_fallocate(req->file, req->sync.mode, req->sync.off, |
3922 | req->sync.len); | |
ac45abc0 PB |
3923 | if (ret < 0) |
3924 | req_set_fail_links(req); | |
e1e16097 | 3925 | io_req_complete(req, ret); |
5d17b4a4 JA |
3926 | return 0; |
3927 | } | |
3928 | ||
ec65fea5 | 3929 | static int __io_openat_prep(struct io_kiocb *req, const struct io_uring_sqe *sqe) |
b7bb4f7d | 3930 | { |
f8748881 | 3931 | const char __user *fname; |
15b71abe | 3932 | int ret; |
b7bb4f7d | 3933 | |
ec65fea5 | 3934 | if (unlikely(sqe->ioprio || sqe->buf_index)) |
15b71abe | 3935 | return -EINVAL; |
ec65fea5 | 3936 | if (unlikely(req->flags & REQ_F_FIXED_FILE)) |
cf3040ca | 3937 | return -EBADF; |
03b1230c | 3938 | |
ec65fea5 PB |
3939 | /* open.how should be already initialised */ |
3940 | if (!(req->open.how.flags & O_PATH) && force_o_largefile()) | |
08a1d26e | 3941 | req->open.how.flags |= O_LARGEFILE; |
3529d8c2 | 3942 | |
25e72d10 PB |
3943 | req->open.dfd = READ_ONCE(sqe->fd); |
3944 | fname = u64_to_user_ptr(READ_ONCE(sqe->addr)); | |
f8748881 | 3945 | req->open.filename = getname(fname); |
15b71abe JA |
3946 | if (IS_ERR(req->open.filename)) { |
3947 | ret = PTR_ERR(req->open.filename); | |
3948 | req->open.filename = NULL; | |
3949 | return ret; | |
3950 | } | |
4022e7af | 3951 | req->open.nofile = rlimit(RLIMIT_NOFILE); |
944d1444 | 3952 | req->open.ignore_nonblock = false; |
8fef80bf | 3953 | req->flags |= REQ_F_NEED_CLEANUP; |
15b71abe | 3954 | return 0; |
03b1230c JA |
3955 | } |
3956 | ||
ec65fea5 PB |
3957 | static int io_openat_prep(struct io_kiocb *req, const struct io_uring_sqe *sqe) |
3958 | { | |
3959 | u64 flags, mode; | |
3960 | ||
14587a46 | 3961 | if (unlikely(req->ctx->flags & IORING_SETUP_IOPOLL)) |
4eb8dded | 3962 | return -EINVAL; |
ec65fea5 PB |
3963 | mode = READ_ONCE(sqe->len); |
3964 | flags = READ_ONCE(sqe->open_flags); | |
3965 | req->open.how = build_open_how(flags, mode); | |
3966 | return __io_openat_prep(req, sqe); | |
3967 | } | |
3968 | ||
cebdb986 | 3969 | static int io_openat2_prep(struct io_kiocb *req, const struct io_uring_sqe *sqe) |
aa1fa28f | 3970 | { |
cebdb986 | 3971 | struct open_how __user *how; |
cebdb986 | 3972 | size_t len; |
0fa03c62 JA |
3973 | int ret; |
3974 | ||
14587a46 | 3975 | if (unlikely(req->ctx->flags & IORING_SETUP_IOPOLL)) |
4eb8dded | 3976 | return -EINVAL; |
cebdb986 JA |
3977 | how = u64_to_user_ptr(READ_ONCE(sqe->addr2)); |
3978 | len = READ_ONCE(sqe->len); | |
cebdb986 JA |
3979 | if (len < OPEN_HOW_SIZE_VER0) |
3980 | return -EINVAL; | |
3529d8c2 | 3981 | |
cebdb986 JA |
3982 | ret = copy_struct_from_user(&req->open.how, sizeof(req->open.how), how, |
3983 | len); | |
3984 | if (ret) | |
3985 | return ret; | |
3529d8c2 | 3986 | |
ec65fea5 | 3987 | return __io_openat_prep(req, sqe); |
cebdb986 JA |
3988 | } |
3989 | ||
014db007 | 3990 | static int io_openat2(struct io_kiocb *req, bool force_nonblock) |
15b71abe JA |
3991 | { |
3992 | struct open_flags op; | |
15b71abe JA |
3993 | struct file *file; |
3994 | int ret; | |
3995 | ||
944d1444 | 3996 | if (force_nonblock && !req->open.ignore_nonblock) |
15b71abe | 3997 | return -EAGAIN; |
15b71abe | 3998 | |
cebdb986 | 3999 | ret = build_open_flags(&req->open.how, &op); |
15b71abe JA |
4000 | if (ret) |
4001 | goto err; | |
4002 | ||
4022e7af | 4003 | ret = __get_unused_fd_flags(req->open.how.flags, req->open.nofile); |
15b71abe JA |
4004 | if (ret < 0) |
4005 | goto err; | |
4006 | ||
4007 | file = do_filp_open(req->open.dfd, req->open.filename, &op); | |
4008 | if (IS_ERR(file)) { | |
4009 | put_unused_fd(ret); | |
4010 | ret = PTR_ERR(file); | |
944d1444 JA |
4011 | /* |
4012 | * A work-around to ensure that /proc/self works that way | |
4013 | * that it should - if we get -EOPNOTSUPP back, then assume | |
4014 | * that proc_self_get_link() failed us because we're in async | |
4015 | * context. We should be safe to retry this from the task | |
4016 | * itself with force_nonblock == false set, as it should not | |
4017 | * block on lookup. Would be nice to know this upfront and | |
4018 | * avoid the async dance, but doesn't seem feasible. | |
4019 | */ | |
4020 | if (ret == -EOPNOTSUPP && io_wq_current_is_worker()) { | |
4021 | req->open.ignore_nonblock = true; | |
4022 | refcount_inc(&req->refs); | |
4023 | io_req_task_queue(req); | |
4024 | return 0; | |
4025 | } | |
15b71abe JA |
4026 | } else { |
4027 | fsnotify_open(file); | |
4028 | fd_install(ret, file); | |
4029 | } | |
4030 | err: | |
4031 | putname(req->open.filename); | |
8fef80bf | 4032 | req->flags &= ~REQ_F_NEED_CLEANUP; |
15b71abe JA |
4033 | if (ret < 0) |
4034 | req_set_fail_links(req); | |
e1e16097 | 4035 | io_req_complete(req, ret); |
15b71abe JA |
4036 | return 0; |
4037 | } | |
4038 | ||
014db007 | 4039 | static int io_openat(struct io_kiocb *req, bool force_nonblock) |
cebdb986 | 4040 | { |
014db007 | 4041 | return io_openat2(req, force_nonblock); |
cebdb986 JA |
4042 | } |
4043 | ||
067524e9 JA |
4044 | static int io_remove_buffers_prep(struct io_kiocb *req, |
4045 | const struct io_uring_sqe *sqe) | |
4046 | { | |
4047 | struct io_provide_buf *p = &req->pbuf; | |
4048 | u64 tmp; | |
4049 | ||
4050 | if (sqe->ioprio || sqe->rw_flags || sqe->addr || sqe->len || sqe->off) | |
4051 | return -EINVAL; | |
4052 | ||
4053 | tmp = READ_ONCE(sqe->fd); | |
4054 | if (!tmp || tmp > USHRT_MAX) | |
4055 | return -EINVAL; | |
4056 | ||
4057 | memset(p, 0, sizeof(*p)); | |
4058 | p->nbufs = tmp; | |
4059 | p->bgid = READ_ONCE(sqe->buf_group); | |
4060 | return 0; | |
4061 | } | |
4062 | ||
4063 | static int __io_remove_buffers(struct io_ring_ctx *ctx, struct io_buffer *buf, | |
4064 | int bgid, unsigned nbufs) | |
4065 | { | |
4066 | unsigned i = 0; | |
4067 | ||
4068 | /* shouldn't happen */ | |
4069 | if (!nbufs) | |
4070 | return 0; | |
4071 | ||
4072 | /* the head kbuf is the list itself */ | |
4073 | while (!list_empty(&buf->list)) { | |
4074 | struct io_buffer *nxt; | |
4075 | ||
4076 | nxt = list_first_entry(&buf->list, struct io_buffer, list); | |
4077 | list_del(&nxt->list); | |
4078 | kfree(nxt); | |
4079 | if (++i == nbufs) | |
4080 | return i; | |
4081 | } | |
4082 | i++; | |
4083 | kfree(buf); | |
4084 | idr_remove(&ctx->io_buffer_idr, bgid); | |
4085 | ||
4086 | return i; | |
4087 | } | |
4088 | ||
229a7b63 JA |
4089 | static int io_remove_buffers(struct io_kiocb *req, bool force_nonblock, |
4090 | struct io_comp_state *cs) | |
067524e9 JA |
4091 | { |
4092 | struct io_provide_buf *p = &req->pbuf; | |
4093 | struct io_ring_ctx *ctx = req->ctx; | |
4094 | struct io_buffer *head; | |
4095 | int ret = 0; | |
4096 | ||
4097 | io_ring_submit_lock(ctx, !force_nonblock); | |
4098 | ||
4099 | lockdep_assert_held(&ctx->uring_lock); | |
4100 | ||
4101 | ret = -ENOENT; | |
4102 | head = idr_find(&ctx->io_buffer_idr, p->bgid); | |
4103 | if (head) | |
4104 | ret = __io_remove_buffers(ctx, head, p->bgid, p->nbufs); | |
4105 | ||
4106 | io_ring_submit_lock(ctx, !force_nonblock); | |
4107 | if (ret < 0) | |
4108 | req_set_fail_links(req); | |
229a7b63 | 4109 | __io_req_complete(req, ret, 0, cs); |
067524e9 JA |
4110 | return 0; |
4111 | } | |
4112 | ||
ddf0322d JA |
4113 | static int io_provide_buffers_prep(struct io_kiocb *req, |
4114 | const struct io_uring_sqe *sqe) | |
4115 | { | |
4116 | struct io_provide_buf *p = &req->pbuf; | |
4117 | u64 tmp; | |
4118 | ||
4119 | if (sqe->ioprio || sqe->rw_flags) | |
4120 | return -EINVAL; | |
4121 | ||
4122 | tmp = READ_ONCE(sqe->fd); | |
4123 | if (!tmp || tmp > USHRT_MAX) | |
4124 | return -E2BIG; | |
4125 | p->nbufs = tmp; | |
4126 | p->addr = READ_ONCE(sqe->addr); | |
4127 | p->len = READ_ONCE(sqe->len); | |
4128 | ||
efe68c1c | 4129 | if (!access_ok(u64_to_user_ptr(p->addr), (p->len * p->nbufs))) |
ddf0322d JA |
4130 | return -EFAULT; |
4131 | ||
4132 | p->bgid = READ_ONCE(sqe->buf_group); | |
4133 | tmp = READ_ONCE(sqe->off); | |
4134 | if (tmp > USHRT_MAX) | |
4135 | return -E2BIG; | |
4136 | p->bid = tmp; | |
4137 | return 0; | |
4138 | } | |
4139 | ||
4140 | static int io_add_buffers(struct io_provide_buf *pbuf, struct io_buffer **head) | |
4141 | { | |
4142 | struct io_buffer *buf; | |
4143 | u64 addr = pbuf->addr; | |
4144 | int i, bid = pbuf->bid; | |
4145 | ||
4146 | for (i = 0; i < pbuf->nbufs; i++) { | |
4147 | buf = kmalloc(sizeof(*buf), GFP_KERNEL); | |
4148 | if (!buf) | |
4149 | break; | |
4150 | ||
4151 | buf->addr = addr; | |
4152 | buf->len = pbuf->len; | |
4153 | buf->bid = bid; | |
4154 | addr += pbuf->len; | |
4155 | bid++; | |
4156 | if (!*head) { | |
4157 | INIT_LIST_HEAD(&buf->list); | |
4158 | *head = buf; | |
4159 | } else { | |
4160 | list_add_tail(&buf->list, &(*head)->list); | |
4161 | } | |
4162 | } | |
4163 | ||
4164 | return i ? i : -ENOMEM; | |
4165 | } | |
4166 | ||
229a7b63 JA |
4167 | static int io_provide_buffers(struct io_kiocb *req, bool force_nonblock, |
4168 | struct io_comp_state *cs) | |
ddf0322d JA |
4169 | { |
4170 | struct io_provide_buf *p = &req->pbuf; | |
4171 | struct io_ring_ctx *ctx = req->ctx; | |
4172 | struct io_buffer *head, *list; | |
4173 | int ret = 0; | |
4174 | ||
4175 | io_ring_submit_lock(ctx, !force_nonblock); | |
4176 | ||
4177 | lockdep_assert_held(&ctx->uring_lock); | |
4178 | ||
4179 | list = head = idr_find(&ctx->io_buffer_idr, p->bgid); | |
4180 | ||
4181 | ret = io_add_buffers(p, &head); | |
4182 | if (ret < 0) | |
4183 | goto out; | |
4184 | ||
4185 | if (!list) { | |
4186 | ret = idr_alloc(&ctx->io_buffer_idr, head, p->bgid, p->bgid + 1, | |
4187 | GFP_KERNEL); | |
4188 | if (ret < 0) { | |
067524e9 | 4189 | __io_remove_buffers(ctx, head, p->bgid, -1U); |
ddf0322d JA |
4190 | goto out; |
4191 | } | |
4192 | } | |
4193 | out: | |
4194 | io_ring_submit_unlock(ctx, !force_nonblock); | |
4195 | if (ret < 0) | |
4196 | req_set_fail_links(req); | |
229a7b63 | 4197 | __io_req_complete(req, ret, 0, cs); |
ddf0322d | 4198 | return 0; |
cebdb986 JA |
4199 | } |
4200 | ||
3e4827b0 JA |
4201 | static int io_epoll_ctl_prep(struct io_kiocb *req, |
4202 | const struct io_uring_sqe *sqe) | |
4203 | { | |
4204 | #if defined(CONFIG_EPOLL) | |
4205 | if (sqe->ioprio || sqe->buf_index) | |
4206 | return -EINVAL; | |
6ca56f84 | 4207 | if (unlikely(req->ctx->flags & (IORING_SETUP_IOPOLL | IORING_SETUP_SQPOLL))) |
3232dd02 | 4208 | return -EINVAL; |
3e4827b0 JA |
4209 | |
4210 | req->epoll.epfd = READ_ONCE(sqe->fd); | |
4211 | req->epoll.op = READ_ONCE(sqe->len); | |
4212 | req->epoll.fd = READ_ONCE(sqe->off); | |
4213 | ||
4214 | if (ep_op_has_event(req->epoll.op)) { | |
4215 | struct epoll_event __user *ev; | |
4216 | ||
4217 | ev = u64_to_user_ptr(READ_ONCE(sqe->addr)); | |
4218 | if (copy_from_user(&req->epoll.event, ev, sizeof(*ev))) | |
4219 | return -EFAULT; | |
4220 | } | |
4221 | ||
4222 | return 0; | |
4223 | #else | |
4224 | return -EOPNOTSUPP; | |
4225 | #endif | |
4226 | } | |
4227 | ||
229a7b63 JA |
4228 | static int io_epoll_ctl(struct io_kiocb *req, bool force_nonblock, |
4229 | struct io_comp_state *cs) | |
3e4827b0 JA |
4230 | { |
4231 | #if defined(CONFIG_EPOLL) | |
4232 | struct io_epoll *ie = &req->epoll; | |
4233 | int ret; | |
4234 | ||
4235 | ret = do_epoll_ctl(ie->epfd, ie->op, ie->fd, &ie->event, force_nonblock); | |
4236 | if (force_nonblock && ret == -EAGAIN) | |
4237 | return -EAGAIN; | |
4238 | ||
4239 | if (ret < 0) | |
4240 | req_set_fail_links(req); | |
229a7b63 | 4241 | __io_req_complete(req, ret, 0, cs); |
3e4827b0 JA |
4242 | return 0; |
4243 | #else | |
4244 | return -EOPNOTSUPP; | |
4245 | #endif | |
4246 | } | |
4247 | ||
c1ca757b JA |
4248 | static int io_madvise_prep(struct io_kiocb *req, const struct io_uring_sqe *sqe) |
4249 | { | |
4250 | #if defined(CONFIG_ADVISE_SYSCALLS) && defined(CONFIG_MMU) | |
4251 | if (sqe->ioprio || sqe->buf_index || sqe->off) | |
4252 | return -EINVAL; | |
3232dd02 PB |
4253 | if (unlikely(req->ctx->flags & IORING_SETUP_IOPOLL)) |
4254 | return -EINVAL; | |
c1ca757b JA |
4255 | |
4256 | req->madvise.addr = READ_ONCE(sqe->addr); | |
4257 | req->madvise.len = READ_ONCE(sqe->len); | |
4258 | req->madvise.advice = READ_ONCE(sqe->fadvise_advice); | |
4259 | return 0; | |
4260 | #else | |
4261 | return -EOPNOTSUPP; | |
4262 | #endif | |
4263 | } | |
4264 | ||
014db007 | 4265 | static int io_madvise(struct io_kiocb *req, bool force_nonblock) |
c1ca757b JA |
4266 | { |
4267 | #if defined(CONFIG_ADVISE_SYSCALLS) && defined(CONFIG_MMU) | |
4268 | struct io_madvise *ma = &req->madvise; | |
4269 | int ret; | |
4270 | ||
4271 | if (force_nonblock) | |
4272 | return -EAGAIN; | |
4273 | ||
0726b01e | 4274 | ret = do_madvise(current->mm, ma->addr, ma->len, ma->advice); |
c1ca757b JA |
4275 | if (ret < 0) |
4276 | req_set_fail_links(req); | |
e1e16097 | 4277 | io_req_complete(req, ret); |
c1ca757b JA |
4278 | return 0; |
4279 | #else | |
4280 | return -EOPNOTSUPP; | |
4281 | #endif | |
4282 | } | |
4283 | ||
4840e418 JA |
4284 | static int io_fadvise_prep(struct io_kiocb *req, const struct io_uring_sqe *sqe) |
4285 | { | |
4286 | if (sqe->ioprio || sqe->buf_index || sqe->addr) | |
4287 | return -EINVAL; | |
3232dd02 PB |
4288 | if (unlikely(req->ctx->flags & IORING_SETUP_IOPOLL)) |
4289 | return -EINVAL; | |
4840e418 JA |
4290 | |
4291 | req->fadvise.offset = READ_ONCE(sqe->off); | |
4292 | req->fadvise.len = READ_ONCE(sqe->len); | |
4293 | req->fadvise.advice = READ_ONCE(sqe->fadvise_advice); | |
4294 | return 0; | |
4295 | } | |
4296 | ||
014db007 | 4297 | static int io_fadvise(struct io_kiocb *req, bool force_nonblock) |
4840e418 JA |
4298 | { |
4299 | struct io_fadvise *fa = &req->fadvise; | |
4300 | int ret; | |
4301 | ||
3e69426d JA |
4302 | if (force_nonblock) { |
4303 | switch (fa->advice) { | |
4304 | case POSIX_FADV_NORMAL: | |
4305 | case POSIX_FADV_RANDOM: | |
4306 | case POSIX_FADV_SEQUENTIAL: | |
4307 | break; | |
4308 | default: | |
4309 | return -EAGAIN; | |
4310 | } | |
4311 | } | |
4840e418 JA |
4312 | |
4313 | ret = vfs_fadvise(req->file, fa->offset, fa->len, fa->advice); | |
4314 | if (ret < 0) | |
4315 | req_set_fail_links(req); | |
e1e16097 | 4316 | io_req_complete(req, ret); |
4840e418 JA |
4317 | return 0; |
4318 | } | |
4319 | ||
eddc7ef5 JA |
4320 | static int io_statx_prep(struct io_kiocb *req, const struct io_uring_sqe *sqe) |
4321 | { | |
6ca56f84 | 4322 | if (unlikely(req->ctx->flags & (IORING_SETUP_IOPOLL | IORING_SETUP_SQPOLL))) |
3232dd02 | 4323 | return -EINVAL; |
eddc7ef5 JA |
4324 | if (sqe->ioprio || sqe->buf_index) |
4325 | return -EINVAL; | |
9c280f90 | 4326 | if (req->flags & REQ_F_FIXED_FILE) |
cf3040ca | 4327 | return -EBADF; |
eddc7ef5 | 4328 | |
1d9e1288 BM |
4329 | req->statx.dfd = READ_ONCE(sqe->fd); |
4330 | req->statx.mask = READ_ONCE(sqe->len); | |
e62753e4 | 4331 | req->statx.filename = u64_to_user_ptr(READ_ONCE(sqe->addr)); |
1d9e1288 BM |
4332 | req->statx.buffer = u64_to_user_ptr(READ_ONCE(sqe->addr2)); |
4333 | req->statx.flags = READ_ONCE(sqe->statx_flags); | |
eddc7ef5 JA |
4334 | |
4335 | return 0; | |
4336 | } | |
4337 | ||
014db007 | 4338 | static int io_statx(struct io_kiocb *req, bool force_nonblock) |
eddc7ef5 | 4339 | { |
1d9e1288 | 4340 | struct io_statx *ctx = &req->statx; |
eddc7ef5 JA |
4341 | int ret; |
4342 | ||
5b0bbee4 JA |
4343 | if (force_nonblock) { |
4344 | /* only need file table for an actual valid fd */ | |
4345 | if (ctx->dfd == -1 || ctx->dfd == AT_FDCWD) | |
4346 | req->flags |= REQ_F_NO_FILE_TABLE; | |
eddc7ef5 | 4347 | return -EAGAIN; |
5b0bbee4 | 4348 | } |
eddc7ef5 | 4349 | |
e62753e4 BM |
4350 | ret = do_statx(ctx->dfd, ctx->filename, ctx->flags, ctx->mask, |
4351 | ctx->buffer); | |
eddc7ef5 | 4352 | |
eddc7ef5 JA |
4353 | if (ret < 0) |
4354 | req_set_fail_links(req); | |
e1e16097 | 4355 | io_req_complete(req, ret); |
eddc7ef5 JA |
4356 | return 0; |
4357 | } | |
4358 | ||
b5dba59e JA |
4359 | static int io_close_prep(struct io_kiocb *req, const struct io_uring_sqe *sqe) |
4360 | { | |
4361 | /* | |
4362 | * If we queue this for async, it must not be cancellable. That would | |
7cdaf587 XW |
4363 | * leave the 'file' in an undeterminate state, and here need to modify |
4364 | * io_wq_work.flags, so initialize io_wq_work firstly. | |
b5dba59e | 4365 | */ |
7cdaf587 | 4366 | io_req_init_async(req); |
b5dba59e JA |
4367 | req->work.flags |= IO_WQ_WORK_NO_CANCEL; |
4368 | ||
14587a46 | 4369 | if (unlikely(req->ctx->flags & IORING_SETUP_IOPOLL)) |
3232dd02 | 4370 | return -EINVAL; |
b5dba59e JA |
4371 | if (sqe->ioprio || sqe->off || sqe->addr || sqe->len || |
4372 | sqe->rw_flags || sqe->buf_index) | |
4373 | return -EINVAL; | |
9c280f90 | 4374 | if (req->flags & REQ_F_FIXED_FILE) |
cf3040ca | 4375 | return -EBADF; |
b5dba59e JA |
4376 | |
4377 | req->close.fd = READ_ONCE(sqe->fd); | |
0f212204 | 4378 | if ((req->file && req->file->f_op == &io_uring_fops)) |
fd2206e4 | 4379 | return -EBADF; |
b5dba59e | 4380 | |
3af73b28 | 4381 | req->close.put_file = NULL; |
b5dba59e | 4382 | return 0; |
b5dba59e JA |
4383 | } |
4384 | ||
229a7b63 JA |
4385 | static int io_close(struct io_kiocb *req, bool force_nonblock, |
4386 | struct io_comp_state *cs) | |
b5dba59e | 4387 | { |
3af73b28 | 4388 | struct io_close *close = &req->close; |
b5dba59e JA |
4389 | int ret; |
4390 | ||
3af73b28 PB |
4391 | /* might be already done during nonblock submission */ |
4392 | if (!close->put_file) { | |
4393 | ret = __close_fd_get_file(close->fd, &close->put_file); | |
4394 | if (ret < 0) | |
4395 | return (ret == -ENOENT) ? -EBADF : ret; | |
4396 | } | |
b5dba59e JA |
4397 | |
4398 | /* if the file has a flush method, be safe and punt to async */ | |
3af73b28 | 4399 | if (close->put_file->f_op->flush && force_nonblock) { |
24c74678 PB |
4400 | /* was never set, but play safe */ |
4401 | req->flags &= ~REQ_F_NOWAIT; | |
0bf0eefd | 4402 | /* avoid grabbing files - we don't need the files */ |
24c74678 | 4403 | req->flags |= REQ_F_NO_FILE_TABLE; |
0bf0eefd | 4404 | return -EAGAIN; |
a2100672 | 4405 | } |
b5dba59e | 4406 | |
3af73b28 | 4407 | /* No ->flush() or already async, safely close from here */ |
98447d65 | 4408 | ret = filp_close(close->put_file, req->work.identity->files); |
3af73b28 PB |
4409 | if (ret < 0) |
4410 | req_set_fail_links(req); | |
3af73b28 PB |
4411 | fput(close->put_file); |
4412 | close->put_file = NULL; | |
229a7b63 | 4413 | __io_req_complete(req, ret, 0, cs); |
1a417f4e | 4414 | return 0; |
b5dba59e JA |
4415 | } |
4416 | ||
3529d8c2 | 4417 | static int io_prep_sfr(struct io_kiocb *req, const struct io_uring_sqe *sqe) |
5d17b4a4 JA |
4418 | { |
4419 | struct io_ring_ctx *ctx = req->ctx; | |
5d17b4a4 JA |
4420 | |
4421 | if (!req->file) | |
4422 | return -EBADF; | |
5d17b4a4 JA |
4423 | |
4424 | if (unlikely(ctx->flags & IORING_SETUP_IOPOLL)) | |
4425 | return -EINVAL; | |
4426 | if (unlikely(sqe->addr || sqe->ioprio || sqe->buf_index)) | |
4427 | return -EINVAL; | |
4428 | ||
8ed8d3c3 JA |
4429 | req->sync.off = READ_ONCE(sqe->off); |
4430 | req->sync.len = READ_ONCE(sqe->len); | |
4431 | req->sync.flags = READ_ONCE(sqe->sync_range_flags); | |
8ed8d3c3 JA |
4432 | return 0; |
4433 | } | |
4434 | ||
ac45abc0 | 4435 | static int io_sync_file_range(struct io_kiocb *req, bool force_nonblock) |
8ed8d3c3 | 4436 | { |
8ed8d3c3 JA |
4437 | int ret; |
4438 | ||
ac45abc0 PB |
4439 | /* sync_file_range always requires a blocking context */ |
4440 | if (force_nonblock) | |
4441 | return -EAGAIN; | |
4442 | ||
9adbd45d | 4443 | ret = sync_file_range(req->file, req->sync.off, req->sync.len, |
8ed8d3c3 JA |
4444 | req->sync.flags); |
4445 | if (ret < 0) | |
4446 | req_set_fail_links(req); | |
e1e16097 | 4447 | io_req_complete(req, ret); |
5d17b4a4 JA |
4448 | return 0; |
4449 | } | |
4450 | ||
469956e8 | 4451 | #if defined(CONFIG_NET) |
02d27d89 PB |
4452 | static int io_setup_async_msg(struct io_kiocb *req, |
4453 | struct io_async_msghdr *kmsg) | |
4454 | { | |
e8c2bc1f JA |
4455 | struct io_async_msghdr *async_msg = req->async_data; |
4456 | ||
4457 | if (async_msg) | |
02d27d89 | 4458 | return -EAGAIN; |
e8c2bc1f | 4459 | if (io_alloc_async_data(req)) { |
02d27d89 PB |
4460 | if (kmsg->iov != kmsg->fast_iov) |
4461 | kfree(kmsg->iov); | |
4462 | return -ENOMEM; | |
4463 | } | |
e8c2bc1f | 4464 | async_msg = req->async_data; |
02d27d89 | 4465 | req->flags |= REQ_F_NEED_CLEANUP; |
e8c2bc1f | 4466 | memcpy(async_msg, kmsg, sizeof(*kmsg)); |
02d27d89 PB |
4467 | return -EAGAIN; |
4468 | } | |
4469 | ||
2ae523ed PB |
4470 | static int io_sendmsg_copy_hdr(struct io_kiocb *req, |
4471 | struct io_async_msghdr *iomsg) | |
4472 | { | |
4473 | iomsg->iov = iomsg->fast_iov; | |
4474 | iomsg->msg.msg_name = &iomsg->addr; | |
4475 | return sendmsg_copy_msghdr(&iomsg->msg, req->sr_msg.umsg, | |
4476 | req->sr_msg.msg_flags, &iomsg->iov); | |
4477 | } | |
4478 | ||
3529d8c2 | 4479 | static int io_sendmsg_prep(struct io_kiocb *req, const struct io_uring_sqe *sqe) |
03b1230c | 4480 | { |
e8c2bc1f | 4481 | struct io_async_msghdr *async_msg = req->async_data; |
e47293fd | 4482 | struct io_sr_msg *sr = &req->sr_msg; |
99bc4c38 | 4483 | int ret; |
03b1230c | 4484 | |
d2b6f48b PB |
4485 | if (unlikely(req->ctx->flags & IORING_SETUP_IOPOLL)) |
4486 | return -EINVAL; | |
4487 | ||
e47293fd | 4488 | sr->msg_flags = READ_ONCE(sqe->msg_flags); |
270a5940 | 4489 | sr->umsg = u64_to_user_ptr(READ_ONCE(sqe->addr)); |
fddaface | 4490 | sr->len = READ_ONCE(sqe->len); |
3529d8c2 | 4491 | |
d8768362 JA |
4492 | #ifdef CONFIG_COMPAT |
4493 | if (req->ctx->compat) | |
4494 | sr->msg_flags |= MSG_CMSG_COMPAT; | |
4495 | #endif | |
4496 | ||
e8c2bc1f | 4497 | if (!async_msg || !io_op_defs[req->opcode].needs_async_data) |
3529d8c2 | 4498 | return 0; |
e8c2bc1f | 4499 | ret = io_sendmsg_copy_hdr(req, async_msg); |
99bc4c38 PB |
4500 | if (!ret) |
4501 | req->flags |= REQ_F_NEED_CLEANUP; | |
4502 | return ret; | |
03b1230c JA |
4503 | } |
4504 | ||
229a7b63 JA |
4505 | static int io_sendmsg(struct io_kiocb *req, bool force_nonblock, |
4506 | struct io_comp_state *cs) | |
aa1fa28f | 4507 | { |
6b754c8b | 4508 | struct io_async_msghdr iomsg, *kmsg; |
0fa03c62 | 4509 | struct socket *sock; |
7a7cacba | 4510 | unsigned flags; |
0fa03c62 JA |
4511 | int ret; |
4512 | ||
0fa03c62 | 4513 | sock = sock_from_file(req->file, &ret); |
7a7cacba PB |
4514 | if (unlikely(!sock)) |
4515 | return ret; | |
3529d8c2 | 4516 | |
e8c2bc1f JA |
4517 | if (req->async_data) { |
4518 | kmsg = req->async_data; | |
4519 | kmsg->msg.msg_name = &kmsg->addr; | |
7a7cacba PB |
4520 | /* if iov is set, it's allocated already */ |
4521 | if (!kmsg->iov) | |
4522 | kmsg->iov = kmsg->fast_iov; | |
4523 | kmsg->msg.msg_iter.iov = kmsg->iov; | |
4524 | } else { | |
4525 | ret = io_sendmsg_copy_hdr(req, &iomsg); | |
4526 | if (ret) | |
4527 | return ret; | |
4528 | kmsg = &iomsg; | |
0fa03c62 | 4529 | } |
0fa03c62 | 4530 | |
7a7cacba PB |
4531 | flags = req->sr_msg.msg_flags; |
4532 | if (flags & MSG_DONTWAIT) | |
4533 | req->flags |= REQ_F_NOWAIT; | |
4534 | else if (force_nonblock) | |
4535 | flags |= MSG_DONTWAIT; | |
e47293fd | 4536 | |
7a7cacba PB |
4537 | ret = __sys_sendmsg_sock(sock, &kmsg->msg, flags); |
4538 | if (force_nonblock && ret == -EAGAIN) | |
4539 | return io_setup_async_msg(req, kmsg); | |
4540 | if (ret == -ERESTARTSYS) | |
4541 | ret = -EINTR; | |
0fa03c62 | 4542 | |
6b754c8b | 4543 | if (kmsg->iov != kmsg->fast_iov) |
0b416c3e | 4544 | kfree(kmsg->iov); |
99bc4c38 | 4545 | req->flags &= ~REQ_F_NEED_CLEANUP; |
4e88d6e7 JA |
4546 | if (ret < 0) |
4547 | req_set_fail_links(req); | |
229a7b63 | 4548 | __io_req_complete(req, ret, 0, cs); |
5d17b4a4 | 4549 | return 0; |
03b1230c | 4550 | } |
aa1fa28f | 4551 | |
229a7b63 JA |
4552 | static int io_send(struct io_kiocb *req, bool force_nonblock, |
4553 | struct io_comp_state *cs) | |
fddaface | 4554 | { |
7a7cacba PB |
4555 | struct io_sr_msg *sr = &req->sr_msg; |
4556 | struct msghdr msg; | |
4557 | struct iovec iov; | |
fddaface | 4558 | struct socket *sock; |
7a7cacba | 4559 | unsigned flags; |
fddaface JA |
4560 | int ret; |
4561 | ||
fddaface | 4562 | sock = sock_from_file(req->file, &ret); |
7a7cacba PB |
4563 | if (unlikely(!sock)) |
4564 | return ret; | |
fddaface | 4565 | |
7a7cacba PB |
4566 | ret = import_single_range(WRITE, sr->buf, sr->len, &iov, &msg.msg_iter); |
4567 | if (unlikely(ret)) | |
14db8411 | 4568 | return ret; |
fddaface | 4569 | |
7a7cacba PB |
4570 | msg.msg_name = NULL; |
4571 | msg.msg_control = NULL; | |
4572 | msg.msg_controllen = 0; | |
4573 | msg.msg_namelen = 0; | |
fddaface | 4574 | |
7a7cacba PB |
4575 | flags = req->sr_msg.msg_flags; |
4576 | if (flags & MSG_DONTWAIT) | |
4577 | req->flags |= REQ_F_NOWAIT; | |
4578 | else if (force_nonblock) | |
4579 | flags |= MSG_DONTWAIT; | |
fddaface | 4580 | |
7a7cacba PB |
4581 | msg.msg_flags = flags; |
4582 | ret = sock_sendmsg(sock, &msg); | |
4583 | if (force_nonblock && ret == -EAGAIN) | |
4584 | return -EAGAIN; | |
4585 | if (ret == -ERESTARTSYS) | |
4586 | ret = -EINTR; | |
fddaface | 4587 | |
fddaface JA |
4588 | if (ret < 0) |
4589 | req_set_fail_links(req); | |
229a7b63 | 4590 | __io_req_complete(req, ret, 0, cs); |
fddaface | 4591 | return 0; |
fddaface JA |
4592 | } |
4593 | ||
1400e697 PB |
4594 | static int __io_recvmsg_copy_hdr(struct io_kiocb *req, |
4595 | struct io_async_msghdr *iomsg) | |
52de1fe1 JA |
4596 | { |
4597 | struct io_sr_msg *sr = &req->sr_msg; | |
4598 | struct iovec __user *uiov; | |
4599 | size_t iov_len; | |
4600 | int ret; | |
4601 | ||
1400e697 PB |
4602 | ret = __copy_msghdr_from_user(&iomsg->msg, sr->umsg, |
4603 | &iomsg->uaddr, &uiov, &iov_len); | |
52de1fe1 JA |
4604 | if (ret) |
4605 | return ret; | |
4606 | ||
4607 | if (req->flags & REQ_F_BUFFER_SELECT) { | |
4608 | if (iov_len > 1) | |
4609 | return -EINVAL; | |
1400e697 | 4610 | if (copy_from_user(iomsg->iov, uiov, sizeof(*uiov))) |
52de1fe1 | 4611 | return -EFAULT; |
1400e697 PB |
4612 | sr->len = iomsg->iov[0].iov_len; |
4613 | iov_iter_init(&iomsg->msg.msg_iter, READ, iomsg->iov, 1, | |
52de1fe1 | 4614 | sr->len); |
1400e697 | 4615 | iomsg->iov = NULL; |
52de1fe1 | 4616 | } else { |
89cd35c5 CH |
4617 | ret = __import_iovec(READ, uiov, iov_len, UIO_FASTIOV, |
4618 | &iomsg->iov, &iomsg->msg.msg_iter, | |
4619 | false); | |
52de1fe1 JA |
4620 | if (ret > 0) |
4621 | ret = 0; | |
4622 | } | |
4623 | ||
4624 | return ret; | |
4625 | } | |
4626 | ||
4627 | #ifdef CONFIG_COMPAT | |
4628 | static int __io_compat_recvmsg_copy_hdr(struct io_kiocb *req, | |
1400e697 | 4629 | struct io_async_msghdr *iomsg) |
52de1fe1 JA |
4630 | { |
4631 | struct compat_msghdr __user *msg_compat; | |
4632 | struct io_sr_msg *sr = &req->sr_msg; | |
4633 | struct compat_iovec __user *uiov; | |
4634 | compat_uptr_t ptr; | |
4635 | compat_size_t len; | |
4636 | int ret; | |
4637 | ||
270a5940 | 4638 | msg_compat = (struct compat_msghdr __user *) sr->umsg; |
1400e697 | 4639 | ret = __get_compat_msghdr(&iomsg->msg, msg_compat, &iomsg->uaddr, |
52de1fe1 JA |
4640 | &ptr, &len); |
4641 | if (ret) | |
4642 | return ret; | |
4643 | ||
4644 | uiov = compat_ptr(ptr); | |
4645 | if (req->flags & REQ_F_BUFFER_SELECT) { | |
4646 | compat_ssize_t clen; | |
4647 | ||
4648 | if (len > 1) | |
4649 | return -EINVAL; | |
4650 | if (!access_ok(uiov, sizeof(*uiov))) | |
4651 | return -EFAULT; | |
4652 | if (__get_user(clen, &uiov->iov_len)) | |
4653 | return -EFAULT; | |
4654 | if (clen < 0) | |
4655 | return -EINVAL; | |
1400e697 PB |
4656 | sr->len = iomsg->iov[0].iov_len; |
4657 | iomsg->iov = NULL; | |
52de1fe1 | 4658 | } else { |
89cd35c5 CH |
4659 | ret = __import_iovec(READ, (struct iovec __user *)uiov, len, |
4660 | UIO_FASTIOV, &iomsg->iov, | |
4661 | &iomsg->msg.msg_iter, true); | |
52de1fe1 JA |
4662 | if (ret < 0) |
4663 | return ret; | |
4664 | } | |
4665 | ||
4666 | return 0; | |
4667 | } | |
4668 | #endif | |
4669 | ||
1400e697 PB |
4670 | static int io_recvmsg_copy_hdr(struct io_kiocb *req, |
4671 | struct io_async_msghdr *iomsg) | |
52de1fe1 | 4672 | { |
1400e697 PB |
4673 | iomsg->msg.msg_name = &iomsg->addr; |
4674 | iomsg->iov = iomsg->fast_iov; | |
52de1fe1 JA |
4675 | |
4676 | #ifdef CONFIG_COMPAT | |
4677 | if (req->ctx->compat) | |
1400e697 | 4678 | return __io_compat_recvmsg_copy_hdr(req, iomsg); |
fddaface | 4679 | #endif |
52de1fe1 | 4680 | |
1400e697 | 4681 | return __io_recvmsg_copy_hdr(req, iomsg); |
52de1fe1 JA |
4682 | } |
4683 | ||
bcda7baa | 4684 | static struct io_buffer *io_recv_buffer_select(struct io_kiocb *req, |
7fbb1b54 | 4685 | bool needs_lock) |
bcda7baa JA |
4686 | { |
4687 | struct io_sr_msg *sr = &req->sr_msg; | |
4688 | struct io_buffer *kbuf; | |
4689 | ||
bcda7baa JA |
4690 | kbuf = io_buffer_select(req, &sr->len, sr->bgid, sr->kbuf, needs_lock); |
4691 | if (IS_ERR(kbuf)) | |
4692 | return kbuf; | |
4693 | ||
4694 | sr->kbuf = kbuf; | |
4695 | req->flags |= REQ_F_BUFFER_SELECTED; | |
bcda7baa | 4696 | return kbuf; |
fddaface JA |
4697 | } |
4698 | ||
7fbb1b54 PB |
4699 | static inline unsigned int io_put_recv_kbuf(struct io_kiocb *req) |
4700 | { | |
4701 | return io_put_kbuf(req, req->sr_msg.kbuf); | |
4702 | } | |
4703 | ||
3529d8c2 JA |
4704 | static int io_recvmsg_prep(struct io_kiocb *req, |
4705 | const struct io_uring_sqe *sqe) | |
aa1fa28f | 4706 | { |
e8c2bc1f | 4707 | struct io_async_msghdr *async_msg = req->async_data; |
e47293fd | 4708 | struct io_sr_msg *sr = &req->sr_msg; |
99bc4c38 | 4709 | int ret; |
3529d8c2 | 4710 | |
d2b6f48b PB |
4711 | if (unlikely(req->ctx->flags & IORING_SETUP_IOPOLL)) |
4712 | return -EINVAL; | |
4713 | ||
3529d8c2 | 4714 | sr->msg_flags = READ_ONCE(sqe->msg_flags); |
270a5940 | 4715 | sr->umsg = u64_to_user_ptr(READ_ONCE(sqe->addr)); |
0b7b21e4 | 4716 | sr->len = READ_ONCE(sqe->len); |
bcda7baa | 4717 | sr->bgid = READ_ONCE(sqe->buf_group); |
06b76d44 | 4718 | |
d8768362 JA |
4719 | #ifdef CONFIG_COMPAT |
4720 | if (req->ctx->compat) | |
4721 | sr->msg_flags |= MSG_CMSG_COMPAT; | |
4722 | #endif | |
4723 | ||
e8c2bc1f | 4724 | if (!async_msg || !io_op_defs[req->opcode].needs_async_data) |
5f798bea | 4725 | return 0; |
e8c2bc1f | 4726 | ret = io_recvmsg_copy_hdr(req, async_msg); |
99bc4c38 PB |
4727 | if (!ret) |
4728 | req->flags |= REQ_F_NEED_CLEANUP; | |
4729 | return ret; | |
aa1fa28f JA |
4730 | } |
4731 | ||
229a7b63 JA |
4732 | static int io_recvmsg(struct io_kiocb *req, bool force_nonblock, |
4733 | struct io_comp_state *cs) | |
aa1fa28f | 4734 | { |
6b754c8b | 4735 | struct io_async_msghdr iomsg, *kmsg; |
03b1230c | 4736 | struct socket *sock; |
7fbb1b54 | 4737 | struct io_buffer *kbuf; |
7a7cacba | 4738 | unsigned flags; |
52de1fe1 | 4739 | int ret, cflags = 0; |
03b1230c | 4740 | |
03b1230c | 4741 | sock = sock_from_file(req->file, &ret); |
7a7cacba PB |
4742 | if (unlikely(!sock)) |
4743 | return ret; | |
3529d8c2 | 4744 | |
e8c2bc1f JA |
4745 | if (req->async_data) { |
4746 | kmsg = req->async_data; | |
4747 | kmsg->msg.msg_name = &kmsg->addr; | |
7a7cacba PB |
4748 | /* if iov is set, it's allocated already */ |
4749 | if (!kmsg->iov) | |
4750 | kmsg->iov = kmsg->fast_iov; | |
4751 | kmsg->msg.msg_iter.iov = kmsg->iov; | |
4752 | } else { | |
4753 | ret = io_recvmsg_copy_hdr(req, &iomsg); | |
4754 | if (ret) | |
681fda8d | 4755 | return ret; |
7a7cacba PB |
4756 | kmsg = &iomsg; |
4757 | } | |
03b1230c | 4758 | |
bc02ef33 | 4759 | if (req->flags & REQ_F_BUFFER_SELECT) { |
7fbb1b54 | 4760 | kbuf = io_recv_buffer_select(req, !force_nonblock); |
bc02ef33 | 4761 | if (IS_ERR(kbuf)) |
52de1fe1 | 4762 | return PTR_ERR(kbuf); |
7a7cacba PB |
4763 | kmsg->fast_iov[0].iov_base = u64_to_user_ptr(kbuf->addr); |
4764 | iov_iter_init(&kmsg->msg.msg_iter, READ, kmsg->iov, | |
4765 | 1, req->sr_msg.len); | |
4766 | } | |
52de1fe1 | 4767 | |
7a7cacba PB |
4768 | flags = req->sr_msg.msg_flags; |
4769 | if (flags & MSG_DONTWAIT) | |
4770 | req->flags |= REQ_F_NOWAIT; | |
4771 | else if (force_nonblock) | |
4772 | flags |= MSG_DONTWAIT; | |
e47293fd | 4773 | |
7a7cacba PB |
4774 | ret = __sys_recvmsg_sock(sock, &kmsg->msg, req->sr_msg.umsg, |
4775 | kmsg->uaddr, flags); | |
0e1b6fe3 PB |
4776 | if (force_nonblock && ret == -EAGAIN) |
4777 | return io_setup_async_msg(req, kmsg); | |
7a7cacba PB |
4778 | if (ret == -ERESTARTSYS) |
4779 | ret = -EINTR; | |
03b1230c | 4780 | |
7fbb1b54 PB |
4781 | if (req->flags & REQ_F_BUFFER_SELECTED) |
4782 | cflags = io_put_recv_kbuf(req); | |
6b754c8b | 4783 | if (kmsg->iov != kmsg->fast_iov) |
0b416c3e | 4784 | kfree(kmsg->iov); |
99bc4c38 | 4785 | req->flags &= ~REQ_F_NEED_CLEANUP; |
4e88d6e7 JA |
4786 | if (ret < 0) |
4787 | req_set_fail_links(req); | |
229a7b63 | 4788 | __io_req_complete(req, ret, cflags, cs); |
03b1230c | 4789 | return 0; |
0fa03c62 | 4790 | } |
5d17b4a4 | 4791 | |
229a7b63 JA |
4792 | static int io_recv(struct io_kiocb *req, bool force_nonblock, |
4793 | struct io_comp_state *cs) | |
fddaface | 4794 | { |
6b754c8b | 4795 | struct io_buffer *kbuf; |
7a7cacba PB |
4796 | struct io_sr_msg *sr = &req->sr_msg; |
4797 | struct msghdr msg; | |
4798 | void __user *buf = sr->buf; | |
fddaface | 4799 | struct socket *sock; |
7a7cacba PB |
4800 | struct iovec iov; |
4801 | unsigned flags; | |
bcda7baa | 4802 | int ret, cflags = 0; |
fddaface | 4803 | |
fddaface | 4804 | sock = sock_from_file(req->file, &ret); |
7a7cacba PB |
4805 | if (unlikely(!sock)) |
4806 | return ret; | |
fddaface | 4807 | |
bc02ef33 | 4808 | if (req->flags & REQ_F_BUFFER_SELECT) { |
7fbb1b54 | 4809 | kbuf = io_recv_buffer_select(req, !force_nonblock); |
bcda7baa JA |
4810 | if (IS_ERR(kbuf)) |
4811 | return PTR_ERR(kbuf); | |
7a7cacba | 4812 | buf = u64_to_user_ptr(kbuf->addr); |
bc02ef33 | 4813 | } |
bcda7baa | 4814 | |
7a7cacba | 4815 | ret = import_single_range(READ, buf, sr->len, &iov, &msg.msg_iter); |
14c32eee PB |
4816 | if (unlikely(ret)) |
4817 | goto out_free; | |
fddaface | 4818 | |
7a7cacba PB |
4819 | msg.msg_name = NULL; |
4820 | msg.msg_control = NULL; | |
4821 | msg.msg_controllen = 0; | |
4822 | msg.msg_namelen = 0; | |
4823 | msg.msg_iocb = NULL; | |
4824 | msg.msg_flags = 0; | |
fddaface | 4825 | |
7a7cacba PB |
4826 | flags = req->sr_msg.msg_flags; |
4827 | if (flags & MSG_DONTWAIT) | |
4828 | req->flags |= REQ_F_NOWAIT; | |
4829 | else if (force_nonblock) | |
4830 | flags |= MSG_DONTWAIT; | |
4831 | ||
4832 | ret = sock_recvmsg(sock, &msg, flags); | |
4833 | if (force_nonblock && ret == -EAGAIN) | |
4834 | return -EAGAIN; | |
4835 | if (ret == -ERESTARTSYS) | |
4836 | ret = -EINTR; | |
14c32eee | 4837 | out_free: |
7fbb1b54 PB |
4838 | if (req->flags & REQ_F_BUFFER_SELECTED) |
4839 | cflags = io_put_recv_kbuf(req); | |
fddaface JA |
4840 | if (ret < 0) |
4841 | req_set_fail_links(req); | |
229a7b63 | 4842 | __io_req_complete(req, ret, cflags, cs); |
fddaface | 4843 | return 0; |
fddaface JA |
4844 | } |
4845 | ||
3529d8c2 | 4846 | static int io_accept_prep(struct io_kiocb *req, const struct io_uring_sqe *sqe) |
17f2fe35 | 4847 | { |
8ed8d3c3 JA |
4848 | struct io_accept *accept = &req->accept; |
4849 | ||
14587a46 | 4850 | if (unlikely(req->ctx->flags & IORING_SETUP_IOPOLL)) |
17f2fe35 | 4851 | return -EINVAL; |
8042d6ce | 4852 | if (sqe->ioprio || sqe->len || sqe->buf_index) |
17f2fe35 JA |
4853 | return -EINVAL; |
4854 | ||
d55e5f5b JA |
4855 | accept->addr = u64_to_user_ptr(READ_ONCE(sqe->addr)); |
4856 | accept->addr_len = u64_to_user_ptr(READ_ONCE(sqe->addr2)); | |
8ed8d3c3 | 4857 | accept->flags = READ_ONCE(sqe->accept_flags); |
09952e3e | 4858 | accept->nofile = rlimit(RLIMIT_NOFILE); |
8ed8d3c3 | 4859 | return 0; |
8ed8d3c3 | 4860 | } |
17f2fe35 | 4861 | |
229a7b63 JA |
4862 | static int io_accept(struct io_kiocb *req, bool force_nonblock, |
4863 | struct io_comp_state *cs) | |
8ed8d3c3 JA |
4864 | { |
4865 | struct io_accept *accept = &req->accept; | |
ac45abc0 | 4866 | unsigned int file_flags = force_nonblock ? O_NONBLOCK : 0; |
8ed8d3c3 JA |
4867 | int ret; |
4868 | ||
e697deed JX |
4869 | if (req->file->f_flags & O_NONBLOCK) |
4870 | req->flags |= REQ_F_NOWAIT; | |
4871 | ||
8ed8d3c3 | 4872 | ret = __sys_accept4_file(req->file, file_flags, accept->addr, |
09952e3e JA |
4873 | accept->addr_len, accept->flags, |
4874 | accept->nofile); | |
8ed8d3c3 | 4875 | if (ret == -EAGAIN && force_nonblock) |
17f2fe35 | 4876 | return -EAGAIN; |
ac45abc0 PB |
4877 | if (ret < 0) { |
4878 | if (ret == -ERESTARTSYS) | |
4879 | ret = -EINTR; | |
4e88d6e7 | 4880 | req_set_fail_links(req); |
ac45abc0 | 4881 | } |
229a7b63 | 4882 | __io_req_complete(req, ret, 0, cs); |
17f2fe35 | 4883 | return 0; |
8ed8d3c3 JA |
4884 | } |
4885 | ||
3529d8c2 | 4886 | static int io_connect_prep(struct io_kiocb *req, const struct io_uring_sqe *sqe) |
f499a021 | 4887 | { |
3529d8c2 | 4888 | struct io_connect *conn = &req->connect; |
e8c2bc1f | 4889 | struct io_async_connect *io = req->async_data; |
f499a021 | 4890 | |
14587a46 | 4891 | if (unlikely(req->ctx->flags & IORING_SETUP_IOPOLL)) |
3fbb51c1 JA |
4892 | return -EINVAL; |
4893 | if (sqe->ioprio || sqe->len || sqe->buf_index || sqe->rw_flags) | |
4894 | return -EINVAL; | |
4895 | ||
3529d8c2 JA |
4896 | conn->addr = u64_to_user_ptr(READ_ONCE(sqe->addr)); |
4897 | conn->addr_len = READ_ONCE(sqe->addr2); | |
4898 | ||
4899 | if (!io) | |
4900 | return 0; | |
4901 | ||
4902 | return move_addr_to_kernel(conn->addr, conn->addr_len, | |
e8c2bc1f | 4903 | &io->address); |
f499a021 JA |
4904 | } |
4905 | ||
229a7b63 JA |
4906 | static int io_connect(struct io_kiocb *req, bool force_nonblock, |
4907 | struct io_comp_state *cs) | |
f8e85cf2 | 4908 | { |
e8c2bc1f | 4909 | struct io_async_connect __io, *io; |
f8e85cf2 | 4910 | unsigned file_flags; |
3fbb51c1 | 4911 | int ret; |
f8e85cf2 | 4912 | |
e8c2bc1f JA |
4913 | if (req->async_data) { |
4914 | io = req->async_data; | |
f499a021 | 4915 | } else { |
3529d8c2 JA |
4916 | ret = move_addr_to_kernel(req->connect.addr, |
4917 | req->connect.addr_len, | |
e8c2bc1f | 4918 | &__io.address); |
f499a021 JA |
4919 | if (ret) |
4920 | goto out; | |
4921 | io = &__io; | |
4922 | } | |
4923 | ||
3fbb51c1 JA |
4924 | file_flags = force_nonblock ? O_NONBLOCK : 0; |
4925 | ||
e8c2bc1f | 4926 | ret = __sys_connect_file(req->file, &io->address, |
3fbb51c1 | 4927 | req->connect.addr_len, file_flags); |
87f80d62 | 4928 | if ((ret == -EAGAIN || ret == -EINPROGRESS) && force_nonblock) { |
e8c2bc1f | 4929 | if (req->async_data) |
b7bb4f7d | 4930 | return -EAGAIN; |
e8c2bc1f | 4931 | if (io_alloc_async_data(req)) { |
f499a021 JA |
4932 | ret = -ENOMEM; |
4933 | goto out; | |
4934 | } | |
e8c2bc1f JA |
4935 | io = req->async_data; |
4936 | memcpy(req->async_data, &__io, sizeof(__io)); | |
f8e85cf2 | 4937 | return -EAGAIN; |
f499a021 | 4938 | } |
f8e85cf2 JA |
4939 | if (ret == -ERESTARTSYS) |
4940 | ret = -EINTR; | |
f499a021 | 4941 | out: |
4e88d6e7 JA |
4942 | if (ret < 0) |
4943 | req_set_fail_links(req); | |
229a7b63 | 4944 | __io_req_complete(req, ret, 0, cs); |
f8e85cf2 | 4945 | return 0; |
469956e8 Y |
4946 | } |
4947 | #else /* !CONFIG_NET */ | |
4948 | static int io_sendmsg_prep(struct io_kiocb *req, const struct io_uring_sqe *sqe) | |
4949 | { | |
f8e85cf2 | 4950 | return -EOPNOTSUPP; |
f8e85cf2 JA |
4951 | } |
4952 | ||
1e16c2f9 RD |
4953 | static int io_sendmsg(struct io_kiocb *req, bool force_nonblock, |
4954 | struct io_comp_state *cs) | |
469956e8 Y |
4955 | { |
4956 | return -EOPNOTSUPP; | |
4957 | } | |
4958 | ||
1e16c2f9 RD |
4959 | static int io_send(struct io_kiocb *req, bool force_nonblock, |
4960 | struct io_comp_state *cs) | |
469956e8 Y |
4961 | { |
4962 | return -EOPNOTSUPP; | |
4963 | } | |
4964 | ||
4965 | static int io_recvmsg_prep(struct io_kiocb *req, | |
4966 | const struct io_uring_sqe *sqe) | |
4967 | { | |
4968 | return -EOPNOTSUPP; | |
4969 | } | |
4970 | ||
1e16c2f9 RD |
4971 | static int io_recvmsg(struct io_kiocb *req, bool force_nonblock, |
4972 | struct io_comp_state *cs) | |
469956e8 Y |
4973 | { |
4974 | return -EOPNOTSUPP; | |
4975 | } | |
4976 | ||
1e16c2f9 RD |
4977 | static int io_recv(struct io_kiocb *req, bool force_nonblock, |
4978 | struct io_comp_state *cs) | |
469956e8 Y |
4979 | { |
4980 | return -EOPNOTSUPP; | |
4981 | } | |
4982 | ||
4983 | static int io_accept_prep(struct io_kiocb *req, const struct io_uring_sqe *sqe) | |
4984 | { | |
4985 | return -EOPNOTSUPP; | |
4986 | } | |
4987 | ||
1e16c2f9 RD |
4988 | static int io_accept(struct io_kiocb *req, bool force_nonblock, |
4989 | struct io_comp_state *cs) | |
469956e8 Y |
4990 | { |
4991 | return -EOPNOTSUPP; | |
4992 | } | |
ce593a6c | 4993 | |
469956e8 Y |
4994 | static int io_connect_prep(struct io_kiocb *req, const struct io_uring_sqe *sqe) |
4995 | { | |
4996 | return -EOPNOTSUPP; | |
4997 | } | |
4998 | ||
1e16c2f9 RD |
4999 | static int io_connect(struct io_kiocb *req, bool force_nonblock, |
5000 | struct io_comp_state *cs) | |
469956e8 | 5001 | { |
f8e85cf2 | 5002 | return -EOPNOTSUPP; |
ce593a6c | 5003 | } |
469956e8 | 5004 | #endif /* CONFIG_NET */ |
f8e85cf2 | 5005 | |
d7718a9d JA |
5006 | struct io_poll_table { |
5007 | struct poll_table_struct pt; | |
5008 | struct io_kiocb *req; | |
5009 | int error; | |
5010 | }; | |
ce593a6c | 5011 | |
d7718a9d JA |
5012 | static int __io_async_wake(struct io_kiocb *req, struct io_poll_iocb *poll, |
5013 | __poll_t mask, task_work_func_t func) | |
5014 | { | |
fd7d6de2 | 5015 | bool twa_signal_ok; |
aa96bf8a | 5016 | int ret; |
d7718a9d JA |
5017 | |
5018 | /* for instances that support it check for an event match first: */ | |
5019 | if (mask && !(mask & poll->events)) | |
5020 | return 0; | |
5021 | ||
5022 | trace_io_uring_task_add(req->ctx, req->opcode, req->user_data, mask); | |
5023 | ||
5024 | list_del_init(&poll->wait.entry); | |
5025 | ||
d7718a9d JA |
5026 | req->result = mask; |
5027 | init_task_work(&req->task_work, func); | |
6d816e08 JA |
5028 | percpu_ref_get(&req->ctx->refs); |
5029 | ||
fd7d6de2 JA |
5030 | /* |
5031 | * If we using the signalfd wait_queue_head for this wakeup, then | |
5032 | * it's not safe to use TWA_SIGNAL as we could be recursing on the | |
5033 | * tsk->sighand->siglock on doing the wakeup. Should not be needed | |
5034 | * either, as the normal wakeup will suffice. | |
5035 | */ | |
5036 | twa_signal_ok = (poll->head != &req->task->sighand->signalfd_wqh); | |
5037 | ||
d7718a9d | 5038 | /* |
e3aabf95 JA |
5039 | * If this fails, then the task is exiting. When a task exits, the |
5040 | * work gets canceled, so just cancel this request as well instead | |
5041 | * of executing it. We can't safely execute it anyway, as we may not | |
5042 | * have the needed state needed for it anyway. | |
d7718a9d | 5043 | */ |
87c4311f | 5044 | ret = io_req_task_work_add(req, twa_signal_ok); |
aa96bf8a | 5045 | if (unlikely(ret)) { |
c2c4c83c JA |
5046 | struct task_struct *tsk; |
5047 | ||
e3aabf95 | 5048 | WRITE_ONCE(poll->canceled, true); |
aa96bf8a | 5049 | tsk = io_wq_get_task(req->ctx->io_wq); |
91989c70 | 5050 | task_work_add(tsk, &req->task_work, TWA_NONE); |
ce593a6c | 5051 | wake_up_process(tsk); |
aa96bf8a | 5052 | } |
d7718a9d JA |
5053 | return 1; |
5054 | } | |
5055 | ||
74ce6ce4 JA |
5056 | static bool io_poll_rewait(struct io_kiocb *req, struct io_poll_iocb *poll) |
5057 | __acquires(&req->ctx->completion_lock) | |
5058 | { | |
5059 | struct io_ring_ctx *ctx = req->ctx; | |
5060 | ||
5061 | if (!req->result && !READ_ONCE(poll->canceled)) { | |
5062 | struct poll_table_struct pt = { ._key = poll->events }; | |
5063 | ||
5064 | req->result = vfs_poll(req->file, &pt) & poll->events; | |
5065 | } | |
5066 | ||
5067 | spin_lock_irq(&ctx->completion_lock); | |
5068 | if (!req->result && !READ_ONCE(poll->canceled)) { | |
5069 | add_wait_queue(poll->head, &poll->wait); | |
5070 | return true; | |
5071 | } | |
5072 | ||
5073 | return false; | |
5074 | } | |
5075 | ||
d4e7cd36 | 5076 | static struct io_poll_iocb *io_poll_get_double(struct io_kiocb *req) |
18bceab1 | 5077 | { |
e8c2bc1f | 5078 | /* pure poll stashes this in ->async_data, poll driven retry elsewhere */ |
d4e7cd36 | 5079 | if (req->opcode == IORING_OP_POLL_ADD) |
e8c2bc1f | 5080 | return req->async_data; |
d4e7cd36 JA |
5081 | return req->apoll->double_poll; |
5082 | } | |
5083 | ||
5084 | static struct io_poll_iocb *io_poll_get_single(struct io_kiocb *req) | |
5085 | { | |
5086 | if (req->opcode == IORING_OP_POLL_ADD) | |
5087 | return &req->poll; | |
5088 | return &req->apoll->poll; | |
5089 | } | |
5090 | ||
5091 | static void io_poll_remove_double(struct io_kiocb *req) | |
5092 | { | |
5093 | struct io_poll_iocb *poll = io_poll_get_double(req); | |
18bceab1 JA |
5094 | |
5095 | lockdep_assert_held(&req->ctx->completion_lock); | |
5096 | ||
5097 | if (poll && poll->head) { | |
5098 | struct wait_queue_head *head = poll->head; | |
5099 | ||
5100 | spin_lock(&head->lock); | |
5101 | list_del_init(&poll->wait.entry); | |
5102 | if (poll->wait.private) | |
5103 | refcount_dec(&req->refs); | |
5104 | poll->head = NULL; | |
5105 | spin_unlock(&head->lock); | |
5106 | } | |
5107 | } | |
5108 | ||
5109 | static void io_poll_complete(struct io_kiocb *req, __poll_t mask, int error) | |
5110 | { | |
5111 | struct io_ring_ctx *ctx = req->ctx; | |
5112 | ||
d4e7cd36 | 5113 | io_poll_remove_double(req); |
18bceab1 JA |
5114 | req->poll.done = true; |
5115 | io_cqring_fill_event(req, error ? error : mangle_poll(mask)); | |
5116 | io_commit_cqring(ctx); | |
5117 | } | |
5118 | ||
dd221f46 | 5119 | static void io_poll_task_func(struct callback_head *cb) |
18bceab1 | 5120 | { |
dd221f46 | 5121 | struct io_kiocb *req = container_of(cb, struct io_kiocb, task_work); |
18bceab1 | 5122 | struct io_ring_ctx *ctx = req->ctx; |
dd221f46 | 5123 | struct io_kiocb *nxt; |
18bceab1 JA |
5124 | |
5125 | if (io_poll_rewait(req, &req->poll)) { | |
5126 | spin_unlock_irq(&ctx->completion_lock); | |
dd221f46 PB |
5127 | } else { |
5128 | hash_del(&req->hash_node); | |
5129 | io_poll_complete(req, req->result, 0); | |
5130 | spin_unlock_irq(&ctx->completion_lock); | |
18bceab1 | 5131 | |
dd221f46 PB |
5132 | nxt = io_put_req_find_next(req); |
5133 | io_cqring_ev_posted(ctx); | |
5134 | if (nxt) | |
5135 | __io_req_task_submit(nxt); | |
5136 | } | |
18bceab1 | 5137 | |
6d816e08 | 5138 | percpu_ref_put(&ctx->refs); |
18bceab1 JA |
5139 | } |
5140 | ||
5141 | static int io_poll_double_wake(struct wait_queue_entry *wait, unsigned mode, | |
5142 | int sync, void *key) | |
5143 | { | |
5144 | struct io_kiocb *req = wait->private; | |
d4e7cd36 | 5145 | struct io_poll_iocb *poll = io_poll_get_single(req); |
18bceab1 JA |
5146 | __poll_t mask = key_to_poll(key); |
5147 | ||
5148 | /* for instances that support it check for an event match first: */ | |
5149 | if (mask && !(mask & poll->events)) | |
5150 | return 0; | |
5151 | ||
8706e04e JA |
5152 | list_del_init(&wait->entry); |
5153 | ||
807abcb0 | 5154 | if (poll && poll->head) { |
18bceab1 JA |
5155 | bool done; |
5156 | ||
807abcb0 JA |
5157 | spin_lock(&poll->head->lock); |
5158 | done = list_empty(&poll->wait.entry); | |
18bceab1 | 5159 | if (!done) |
807abcb0 | 5160 | list_del_init(&poll->wait.entry); |
d4e7cd36 JA |
5161 | /* make sure double remove sees this as being gone */ |
5162 | wait->private = NULL; | |
807abcb0 | 5163 | spin_unlock(&poll->head->lock); |
c8b5e260 JA |
5164 | if (!done) { |
5165 | /* use wait func handler, so it matches the rq type */ | |
5166 | poll->wait.func(&poll->wait, mode, sync, key); | |
5167 | } | |
18bceab1 JA |
5168 | } |
5169 | refcount_dec(&req->refs); | |
5170 | return 1; | |
5171 | } | |
5172 | ||
5173 | static void io_init_poll_iocb(struct io_poll_iocb *poll, __poll_t events, | |
5174 | wait_queue_func_t wake_func) | |
5175 | { | |
5176 | poll->head = NULL; | |
5177 | poll->done = false; | |
5178 | poll->canceled = false; | |
5179 | poll->events = events; | |
5180 | INIT_LIST_HEAD(&poll->wait.entry); | |
5181 | init_waitqueue_func_entry(&poll->wait, wake_func); | |
5182 | } | |
5183 | ||
5184 | static void __io_queue_proc(struct io_poll_iocb *poll, struct io_poll_table *pt, | |
807abcb0 JA |
5185 | struct wait_queue_head *head, |
5186 | struct io_poll_iocb **poll_ptr) | |
18bceab1 JA |
5187 | { |
5188 | struct io_kiocb *req = pt->req; | |
5189 | ||
5190 | /* | |
5191 | * If poll->head is already set, it's because the file being polled | |
5192 | * uses multiple waitqueues for poll handling (eg one for read, one | |
5193 | * for write). Setup a separate io_poll_iocb if this happens. | |
5194 | */ | |
5195 | if (unlikely(poll->head)) { | |
58852d4d PB |
5196 | struct io_poll_iocb *poll_one = poll; |
5197 | ||
18bceab1 | 5198 | /* already have a 2nd entry, fail a third attempt */ |
807abcb0 | 5199 | if (*poll_ptr) { |
18bceab1 JA |
5200 | pt->error = -EINVAL; |
5201 | return; | |
5202 | } | |
5203 | poll = kmalloc(sizeof(*poll), GFP_ATOMIC); | |
5204 | if (!poll) { | |
5205 | pt->error = -ENOMEM; | |
5206 | return; | |
5207 | } | |
58852d4d | 5208 | io_init_poll_iocb(poll, poll_one->events, io_poll_double_wake); |
18bceab1 JA |
5209 | refcount_inc(&req->refs); |
5210 | poll->wait.private = req; | |
807abcb0 | 5211 | *poll_ptr = poll; |
18bceab1 JA |
5212 | } |
5213 | ||
5214 | pt->error = 0; | |
5215 | poll->head = head; | |
a31eb4a2 JX |
5216 | |
5217 | if (poll->events & EPOLLEXCLUSIVE) | |
5218 | add_wait_queue_exclusive(head, &poll->wait); | |
5219 | else | |
5220 | add_wait_queue(head, &poll->wait); | |
18bceab1 JA |
5221 | } |
5222 | ||
5223 | static void io_async_queue_proc(struct file *file, struct wait_queue_head *head, | |
5224 | struct poll_table_struct *p) | |
5225 | { | |
5226 | struct io_poll_table *pt = container_of(p, struct io_poll_table, pt); | |
807abcb0 | 5227 | struct async_poll *apoll = pt->req->apoll; |
18bceab1 | 5228 | |
807abcb0 | 5229 | __io_queue_proc(&apoll->poll, pt, head, &apoll->double_poll); |
18bceab1 JA |
5230 | } |
5231 | ||
d7718a9d JA |
5232 | static void io_async_task_func(struct callback_head *cb) |
5233 | { | |
5234 | struct io_kiocb *req = container_of(cb, struct io_kiocb, task_work); | |
5235 | struct async_poll *apoll = req->apoll; | |
5236 | struct io_ring_ctx *ctx = req->ctx; | |
5237 | ||
5238 | trace_io_uring_task_run(req->ctx, req->opcode, req->user_data); | |
5239 | ||
74ce6ce4 | 5240 | if (io_poll_rewait(req, &apoll->poll)) { |
d7718a9d | 5241 | spin_unlock_irq(&ctx->completion_lock); |
6d816e08 | 5242 | percpu_ref_put(&ctx->refs); |
74ce6ce4 | 5243 | return; |
d7718a9d JA |
5244 | } |
5245 | ||
31067255 | 5246 | /* If req is still hashed, it cannot have been canceled. Don't check. */ |
0be0b0e3 | 5247 | if (hash_hashed(&req->hash_node)) |
74ce6ce4 | 5248 | hash_del(&req->hash_node); |
2bae047e | 5249 | |
d4e7cd36 | 5250 | io_poll_remove_double(req); |
74ce6ce4 JA |
5251 | spin_unlock_irq(&ctx->completion_lock); |
5252 | ||
0be0b0e3 PB |
5253 | if (!READ_ONCE(apoll->poll.canceled)) |
5254 | __io_req_task_submit(req); | |
5255 | else | |
5256 | __io_req_task_cancel(req, -ECANCELED); | |
aa340845 | 5257 | |
6d816e08 | 5258 | percpu_ref_put(&ctx->refs); |
807abcb0 | 5259 | kfree(apoll->double_poll); |
31067255 | 5260 | kfree(apoll); |
d7718a9d JA |
5261 | } |
5262 | ||
5263 | static int io_async_wake(struct wait_queue_entry *wait, unsigned mode, int sync, | |
5264 | void *key) | |
5265 | { | |
5266 | struct io_kiocb *req = wait->private; | |
5267 | struct io_poll_iocb *poll = &req->apoll->poll; | |
5268 | ||
5269 | trace_io_uring_poll_wake(req->ctx, req->opcode, req->user_data, | |
5270 | key_to_poll(key)); | |
5271 | ||
5272 | return __io_async_wake(req, poll, key_to_poll(key), io_async_task_func); | |
5273 | } | |
5274 | ||
5275 | static void io_poll_req_insert(struct io_kiocb *req) | |
5276 | { | |
5277 | struct io_ring_ctx *ctx = req->ctx; | |
5278 | struct hlist_head *list; | |
5279 | ||
5280 | list = &ctx->cancel_hash[hash_long(req->user_data, ctx->cancel_hash_bits)]; | |
5281 | hlist_add_head(&req->hash_node, list); | |
5282 | } | |
5283 | ||
5284 | static __poll_t __io_arm_poll_handler(struct io_kiocb *req, | |
5285 | struct io_poll_iocb *poll, | |
5286 | struct io_poll_table *ipt, __poll_t mask, | |
5287 | wait_queue_func_t wake_func) | |
5288 | __acquires(&ctx->completion_lock) | |
5289 | { | |
5290 | struct io_ring_ctx *ctx = req->ctx; | |
5291 | bool cancel = false; | |
5292 | ||
4d52f338 | 5293 | INIT_HLIST_NODE(&req->hash_node); |
18bceab1 | 5294 | io_init_poll_iocb(poll, mask, wake_func); |
b90cd197 | 5295 | poll->file = req->file; |
18bceab1 | 5296 | poll->wait.private = req; |
d7718a9d JA |
5297 | |
5298 | ipt->pt._key = mask; | |
5299 | ipt->req = req; | |
5300 | ipt->error = -EINVAL; | |
5301 | ||
d7718a9d JA |
5302 | mask = vfs_poll(req->file, &ipt->pt) & poll->events; |
5303 | ||
5304 | spin_lock_irq(&ctx->completion_lock); | |
5305 | if (likely(poll->head)) { | |
5306 | spin_lock(&poll->head->lock); | |
5307 | if (unlikely(list_empty(&poll->wait.entry))) { | |
5308 | if (ipt->error) | |
5309 | cancel = true; | |
5310 | ipt->error = 0; | |
5311 | mask = 0; | |
5312 | } | |
5313 | if (mask || ipt->error) | |
5314 | list_del_init(&poll->wait.entry); | |
5315 | else if (cancel) | |
5316 | WRITE_ONCE(poll->canceled, true); | |
5317 | else if (!poll->done) /* actually waiting for an event */ | |
5318 | io_poll_req_insert(req); | |
5319 | spin_unlock(&poll->head->lock); | |
5320 | } | |
5321 | ||
5322 | return mask; | |
5323 | } | |
5324 | ||
5325 | static bool io_arm_poll_handler(struct io_kiocb *req) | |
5326 | { | |
5327 | const struct io_op_def *def = &io_op_defs[req->opcode]; | |
5328 | struct io_ring_ctx *ctx = req->ctx; | |
5329 | struct async_poll *apoll; | |
5330 | struct io_poll_table ipt; | |
5331 | __poll_t mask, ret; | |
9dab14b8 | 5332 | int rw; |
d7718a9d JA |
5333 | |
5334 | if (!req->file || !file_can_poll(req->file)) | |
5335 | return false; | |
24c74678 | 5336 | if (req->flags & REQ_F_POLLED) |
d7718a9d | 5337 | return false; |
9dab14b8 JA |
5338 | if (def->pollin) |
5339 | rw = READ; | |
5340 | else if (def->pollout) | |
5341 | rw = WRITE; | |
5342 | else | |
5343 | return false; | |
5344 | /* if we can't nonblock try, then no point in arming a poll handler */ | |
5345 | if (!io_file_supports_async(req->file, rw)) | |
d7718a9d JA |
5346 | return false; |
5347 | ||
5348 | apoll = kmalloc(sizeof(*apoll), GFP_ATOMIC); | |
5349 | if (unlikely(!apoll)) | |
5350 | return false; | |
807abcb0 | 5351 | apoll->double_poll = NULL; |
d7718a9d JA |
5352 | |
5353 | req->flags |= REQ_F_POLLED; | |
d7718a9d | 5354 | req->apoll = apoll; |
d7718a9d | 5355 | |
8755d97a | 5356 | mask = 0; |
d7718a9d | 5357 | if (def->pollin) |
8755d97a | 5358 | mask |= POLLIN | POLLRDNORM; |
d7718a9d JA |
5359 | if (def->pollout) |
5360 | mask |= POLLOUT | POLLWRNORM; | |
901341bb LH |
5361 | |
5362 | /* If reading from MSG_ERRQUEUE using recvmsg, ignore POLLIN */ | |
5363 | if ((req->opcode == IORING_OP_RECVMSG) && | |
5364 | (req->sr_msg.msg_flags & MSG_ERRQUEUE)) | |
5365 | mask &= ~POLLIN; | |
5366 | ||
d7718a9d JA |
5367 | mask |= POLLERR | POLLPRI; |
5368 | ||
5369 | ipt.pt._qproc = io_async_queue_proc; | |
5370 | ||
5371 | ret = __io_arm_poll_handler(req, &apoll->poll, &ipt, mask, | |
5372 | io_async_wake); | |
a36da65c | 5373 | if (ret || ipt.error) { |
d4e7cd36 | 5374 | io_poll_remove_double(req); |
d7718a9d | 5375 | spin_unlock_irq(&ctx->completion_lock); |
807abcb0 | 5376 | kfree(apoll->double_poll); |
d7718a9d JA |
5377 | kfree(apoll); |
5378 | return false; | |
5379 | } | |
5380 | spin_unlock_irq(&ctx->completion_lock); | |
5381 | trace_io_uring_poll_arm(ctx, req->opcode, req->user_data, mask, | |
5382 | apoll->poll.events); | |
5383 | return true; | |
5384 | } | |
5385 | ||
5386 | static bool __io_poll_remove_one(struct io_kiocb *req, | |
5387 | struct io_poll_iocb *poll) | |
221c5eb2 | 5388 | { |
b41e9852 | 5389 | bool do_complete = false; |
221c5eb2 JA |
5390 | |
5391 | spin_lock(&poll->head->lock); | |
5392 | WRITE_ONCE(poll->canceled, true); | |
392edb45 JA |
5393 | if (!list_empty(&poll->wait.entry)) { |
5394 | list_del_init(&poll->wait.entry); | |
b41e9852 | 5395 | do_complete = true; |
221c5eb2 JA |
5396 | } |
5397 | spin_unlock(&poll->head->lock); | |
3bfa5bcb | 5398 | hash_del(&req->hash_node); |
d7718a9d JA |
5399 | return do_complete; |
5400 | } | |
5401 | ||
5402 | static bool io_poll_remove_one(struct io_kiocb *req) | |
5403 | { | |
5404 | bool do_complete; | |
5405 | ||
d4e7cd36 JA |
5406 | io_poll_remove_double(req); |
5407 | ||
d7718a9d JA |
5408 | if (req->opcode == IORING_OP_POLL_ADD) { |
5409 | do_complete = __io_poll_remove_one(req, &req->poll); | |
5410 | } else { | |
3bfa5bcb JA |
5411 | struct async_poll *apoll = req->apoll; |
5412 | ||
d7718a9d | 5413 | /* non-poll requests have submit ref still */ |
3bfa5bcb JA |
5414 | do_complete = __io_poll_remove_one(req, &apoll->poll); |
5415 | if (do_complete) { | |
d7718a9d | 5416 | io_put_req(req); |
807abcb0 | 5417 | kfree(apoll->double_poll); |
3bfa5bcb JA |
5418 | kfree(apoll); |
5419 | } | |
b1f573bd XW |
5420 | } |
5421 | ||
b41e9852 JA |
5422 | if (do_complete) { |
5423 | io_cqring_fill_event(req, -ECANCELED); | |
5424 | io_commit_cqring(req->ctx); | |
f254ac04 | 5425 | req_set_fail_links(req); |
216578e5 | 5426 | io_put_req_deferred(req, 1); |
b41e9852 JA |
5427 | } |
5428 | ||
5429 | return do_complete; | |
221c5eb2 JA |
5430 | } |
5431 | ||
76e1b642 JA |
5432 | /* |
5433 | * Returns true if we found and killed one or more poll requests | |
5434 | */ | |
5435 | static bool io_poll_remove_all(struct io_ring_ctx *ctx, struct task_struct *tsk) | |
221c5eb2 | 5436 | { |
78076bb6 | 5437 | struct hlist_node *tmp; |
221c5eb2 | 5438 | struct io_kiocb *req; |
8e2e1faf | 5439 | int posted = 0, i; |
221c5eb2 JA |
5440 | |
5441 | spin_lock_irq(&ctx->completion_lock); | |
78076bb6 JA |
5442 | for (i = 0; i < (1U << ctx->cancel_hash_bits); i++) { |
5443 | struct hlist_head *list; | |
5444 | ||
5445 | list = &ctx->cancel_hash[i]; | |
f3606e3a JA |
5446 | hlist_for_each_entry_safe(req, tmp, list, hash_node) { |
5447 | if (io_task_match(req, tsk)) | |
5448 | posted += io_poll_remove_one(req); | |
5449 | } | |
221c5eb2 JA |
5450 | } |
5451 | spin_unlock_irq(&ctx->completion_lock); | |
b41e9852 | 5452 | |
8e2e1faf JA |
5453 | if (posted) |
5454 | io_cqring_ev_posted(ctx); | |
76e1b642 JA |
5455 | |
5456 | return posted != 0; | |
221c5eb2 JA |
5457 | } |
5458 | ||
47f46768 JA |
5459 | static int io_poll_cancel(struct io_ring_ctx *ctx, __u64 sqe_addr) |
5460 | { | |
78076bb6 | 5461 | struct hlist_head *list; |
47f46768 JA |
5462 | struct io_kiocb *req; |
5463 | ||
78076bb6 JA |
5464 | list = &ctx->cancel_hash[hash_long(sqe_addr, ctx->cancel_hash_bits)]; |
5465 | hlist_for_each_entry(req, list, hash_node) { | |
b41e9852 JA |
5466 | if (sqe_addr != req->user_data) |
5467 | continue; | |
5468 | if (io_poll_remove_one(req)) | |
eac406c6 | 5469 | return 0; |
b41e9852 | 5470 | return -EALREADY; |
47f46768 JA |
5471 | } |
5472 | ||
5473 | return -ENOENT; | |
5474 | } | |
5475 | ||
3529d8c2 JA |
5476 | static int io_poll_remove_prep(struct io_kiocb *req, |
5477 | const struct io_uring_sqe *sqe) | |
0969e783 | 5478 | { |
0969e783 JA |
5479 | if (unlikely(req->ctx->flags & IORING_SETUP_IOPOLL)) |
5480 | return -EINVAL; | |
5481 | if (sqe->ioprio || sqe->off || sqe->len || sqe->buf_index || | |
5482 | sqe->poll_events) | |
5483 | return -EINVAL; | |
5484 | ||
5485 | req->poll.addr = READ_ONCE(sqe->addr); | |
0969e783 JA |
5486 | return 0; |
5487 | } | |
5488 | ||
221c5eb2 JA |
5489 | /* |
5490 | * Find a running poll command that matches one specified in sqe->addr, | |
5491 | * and remove it if found. | |
5492 | */ | |
fc4df999 | 5493 | static int io_poll_remove(struct io_kiocb *req) |
221c5eb2 JA |
5494 | { |
5495 | struct io_ring_ctx *ctx = req->ctx; | |
0969e783 | 5496 | u64 addr; |
47f46768 | 5497 | int ret; |
221c5eb2 | 5498 | |
0969e783 | 5499 | addr = req->poll.addr; |
221c5eb2 | 5500 | spin_lock_irq(&ctx->completion_lock); |
0969e783 | 5501 | ret = io_poll_cancel(ctx, addr); |
221c5eb2 JA |
5502 | spin_unlock_irq(&ctx->completion_lock); |
5503 | ||
4e88d6e7 JA |
5504 | if (ret < 0) |
5505 | req_set_fail_links(req); | |
e1e16097 | 5506 | io_req_complete(req, ret); |
221c5eb2 JA |
5507 | return 0; |
5508 | } | |
5509 | ||
221c5eb2 JA |
5510 | static int io_poll_wake(struct wait_queue_entry *wait, unsigned mode, int sync, |
5511 | void *key) | |
5512 | { | |
c2f2eb7d JA |
5513 | struct io_kiocb *req = wait->private; |
5514 | struct io_poll_iocb *poll = &req->poll; | |
221c5eb2 | 5515 | |
d7718a9d | 5516 | return __io_async_wake(req, poll, key_to_poll(key), io_poll_task_func); |
221c5eb2 JA |
5517 | } |
5518 | ||
221c5eb2 JA |
5519 | static void io_poll_queue_proc(struct file *file, struct wait_queue_head *head, |
5520 | struct poll_table_struct *p) | |
5521 | { | |
5522 | struct io_poll_table *pt = container_of(p, struct io_poll_table, pt); | |
5523 | ||
e8c2bc1f | 5524 | __io_queue_proc(&pt->req->poll, pt, head, (struct io_poll_iocb **) &pt->req->async_data); |
eac406c6 JA |
5525 | } |
5526 | ||
3529d8c2 | 5527 | static int io_poll_add_prep(struct io_kiocb *req, const struct io_uring_sqe *sqe) |
221c5eb2 JA |
5528 | { |
5529 | struct io_poll_iocb *poll = &req->poll; | |
5769a351 | 5530 | u32 events; |
221c5eb2 JA |
5531 | |
5532 | if (unlikely(req->ctx->flags & IORING_SETUP_IOPOLL)) | |
5533 | return -EINVAL; | |
5534 | if (sqe->addr || sqe->ioprio || sqe->off || sqe->len || sqe->buf_index) | |
5535 | return -EINVAL; | |
5536 | ||
5769a351 JX |
5537 | events = READ_ONCE(sqe->poll32_events); |
5538 | #ifdef __BIG_ENDIAN | |
5539 | events = swahw32(events); | |
5540 | #endif | |
a31eb4a2 JX |
5541 | poll->events = demangle_poll(events) | EPOLLERR | EPOLLHUP | |
5542 | (events & EPOLLEXCLUSIVE); | |
0969e783 JA |
5543 | return 0; |
5544 | } | |
5545 | ||
014db007 | 5546 | static int io_poll_add(struct io_kiocb *req) |
0969e783 JA |
5547 | { |
5548 | struct io_poll_iocb *poll = &req->poll; | |
5549 | struct io_ring_ctx *ctx = req->ctx; | |
5550 | struct io_poll_table ipt; | |
0969e783 | 5551 | __poll_t mask; |
0969e783 | 5552 | |
d7718a9d | 5553 | ipt.pt._qproc = io_poll_queue_proc; |
36703247 | 5554 | |
d7718a9d JA |
5555 | mask = __io_arm_poll_handler(req, &req->poll, &ipt, poll->events, |
5556 | io_poll_wake); | |
221c5eb2 | 5557 | |
8c838788 | 5558 | if (mask) { /* no async, we'd stolen it */ |
221c5eb2 | 5559 | ipt.error = 0; |
b0dd8a41 | 5560 | io_poll_complete(req, mask, 0); |
221c5eb2 | 5561 | } |
221c5eb2 JA |
5562 | spin_unlock_irq(&ctx->completion_lock); |
5563 | ||
8c838788 JA |
5564 | if (mask) { |
5565 | io_cqring_ev_posted(ctx); | |
014db007 | 5566 | io_put_req(req); |
221c5eb2 | 5567 | } |
8c838788 | 5568 | return ipt.error; |
221c5eb2 JA |
5569 | } |
5570 | ||
5262f567 JA |
5571 | static enum hrtimer_restart io_timeout_fn(struct hrtimer *timer) |
5572 | { | |
ad8a48ac JA |
5573 | struct io_timeout_data *data = container_of(timer, |
5574 | struct io_timeout_data, timer); | |
5575 | struct io_kiocb *req = data->req; | |
5576 | struct io_ring_ctx *ctx = req->ctx; | |
5262f567 JA |
5577 | unsigned long flags; |
5578 | ||
5262f567 | 5579 | spin_lock_irqsave(&ctx->completion_lock, flags); |
a71976f3 | 5580 | list_del_init(&req->timeout.list); |
01cec8c1 PB |
5581 | atomic_set(&req->ctx->cq_timeouts, |
5582 | atomic_read(&req->ctx->cq_timeouts) + 1); | |
5583 | ||
78e19bbe | 5584 | io_cqring_fill_event(req, -ETIME); |
5262f567 JA |
5585 | io_commit_cqring(ctx); |
5586 | spin_unlock_irqrestore(&ctx->completion_lock, flags); | |
5587 | ||
5588 | io_cqring_ev_posted(ctx); | |
4e88d6e7 | 5589 | req_set_fail_links(req); |
5262f567 JA |
5590 | io_put_req(req); |
5591 | return HRTIMER_NORESTART; | |
5592 | } | |
5593 | ||
f254ac04 JA |
5594 | static int __io_timeout_cancel(struct io_kiocb *req) |
5595 | { | |
e8c2bc1f | 5596 | struct io_timeout_data *io = req->async_data; |
f254ac04 JA |
5597 | int ret; |
5598 | ||
e8c2bc1f | 5599 | ret = hrtimer_try_to_cancel(&io->timer); |
f254ac04 JA |
5600 | if (ret == -1) |
5601 | return -EALREADY; | |
a71976f3 | 5602 | list_del_init(&req->timeout.list); |
f254ac04 JA |
5603 | |
5604 | req_set_fail_links(req); | |
f254ac04 | 5605 | io_cqring_fill_event(req, -ECANCELED); |
216578e5 | 5606 | io_put_req_deferred(req, 1); |
f254ac04 JA |
5607 | return 0; |
5608 | } | |
5609 | ||
47f46768 JA |
5610 | static int io_timeout_cancel(struct io_ring_ctx *ctx, __u64 user_data) |
5611 | { | |
5612 | struct io_kiocb *req; | |
5613 | int ret = -ENOENT; | |
5614 | ||
135fcde8 | 5615 | list_for_each_entry(req, &ctx->timeout_list, timeout.list) { |
47f46768 | 5616 | if (user_data == req->user_data) { |
47f46768 JA |
5617 | ret = 0; |
5618 | break; | |
5619 | } | |
5620 | } | |
5621 | ||
5622 | if (ret == -ENOENT) | |
5623 | return ret; | |
5624 | ||
f254ac04 | 5625 | return __io_timeout_cancel(req); |
47f46768 JA |
5626 | } |
5627 | ||
3529d8c2 JA |
5628 | static int io_timeout_remove_prep(struct io_kiocb *req, |
5629 | const struct io_uring_sqe *sqe) | |
b29472ee | 5630 | { |
b29472ee JA |
5631 | if (unlikely(req->ctx->flags & IORING_SETUP_IOPOLL)) |
5632 | return -EINVAL; | |
61710e43 DA |
5633 | if (unlikely(req->flags & (REQ_F_FIXED_FILE | REQ_F_BUFFER_SELECT))) |
5634 | return -EINVAL; | |
0bdf7a2d | 5635 | if (sqe->ioprio || sqe->buf_index || sqe->len || sqe->timeout_flags) |
b29472ee JA |
5636 | return -EINVAL; |
5637 | ||
0bdf7a2d | 5638 | req->timeout_rem.addr = READ_ONCE(sqe->addr); |
b29472ee JA |
5639 | return 0; |
5640 | } | |
5641 | ||
11365043 JA |
5642 | /* |
5643 | * Remove or update an existing timeout command | |
5644 | */ | |
fc4df999 | 5645 | static int io_timeout_remove(struct io_kiocb *req) |
11365043 JA |
5646 | { |
5647 | struct io_ring_ctx *ctx = req->ctx; | |
47f46768 | 5648 | int ret; |
11365043 | 5649 | |
11365043 | 5650 | spin_lock_irq(&ctx->completion_lock); |
0bdf7a2d | 5651 | ret = io_timeout_cancel(ctx, req->timeout_rem.addr); |
11365043 | 5652 | |
47f46768 | 5653 | io_cqring_fill_event(req, ret); |
11365043 JA |
5654 | io_commit_cqring(ctx); |
5655 | spin_unlock_irq(&ctx->completion_lock); | |
5262f567 | 5656 | io_cqring_ev_posted(ctx); |
4e88d6e7 JA |
5657 | if (ret < 0) |
5658 | req_set_fail_links(req); | |
ec9c02ad | 5659 | io_put_req(req); |
11365043 | 5660 | return 0; |
5262f567 JA |
5661 | } |
5662 | ||
3529d8c2 | 5663 | static int io_timeout_prep(struct io_kiocb *req, const struct io_uring_sqe *sqe, |
2d28390a | 5664 | bool is_timeout_link) |
5262f567 | 5665 | { |
ad8a48ac | 5666 | struct io_timeout_data *data; |
a41525ab | 5667 | unsigned flags; |
56080b02 | 5668 | u32 off = READ_ONCE(sqe->off); |
5262f567 | 5669 | |
ad8a48ac | 5670 | if (unlikely(req->ctx->flags & IORING_SETUP_IOPOLL)) |
5262f567 | 5671 | return -EINVAL; |
ad8a48ac | 5672 | if (sqe->ioprio || sqe->buf_index || sqe->len != 1) |
a41525ab | 5673 | return -EINVAL; |
56080b02 | 5674 | if (off && is_timeout_link) |
2d28390a | 5675 | return -EINVAL; |
a41525ab JA |
5676 | flags = READ_ONCE(sqe->timeout_flags); |
5677 | if (flags & ~IORING_TIMEOUT_ABS) | |
5262f567 | 5678 | return -EINVAL; |
bdf20073 | 5679 | |
bfe68a22 | 5680 | req->timeout.off = off; |
26a61679 | 5681 | |
e8c2bc1f | 5682 | if (!req->async_data && io_alloc_async_data(req)) |
26a61679 JA |
5683 | return -ENOMEM; |
5684 | ||
e8c2bc1f | 5685 | data = req->async_data; |
ad8a48ac | 5686 | data->req = req; |
ad8a48ac JA |
5687 | |
5688 | if (get_timespec64(&data->ts, u64_to_user_ptr(sqe->addr))) | |
5262f567 JA |
5689 | return -EFAULT; |
5690 | ||
11365043 | 5691 | if (flags & IORING_TIMEOUT_ABS) |
ad8a48ac | 5692 | data->mode = HRTIMER_MODE_ABS; |
11365043 | 5693 | else |
ad8a48ac | 5694 | data->mode = HRTIMER_MODE_REL; |
11365043 | 5695 | |
ad8a48ac JA |
5696 | hrtimer_init(&data->timer, CLOCK_MONOTONIC, data->mode); |
5697 | return 0; | |
5698 | } | |
5699 | ||
fc4df999 | 5700 | static int io_timeout(struct io_kiocb *req) |
ad8a48ac | 5701 | { |
ad8a48ac | 5702 | struct io_ring_ctx *ctx = req->ctx; |
e8c2bc1f | 5703 | struct io_timeout_data *data = req->async_data; |
ad8a48ac | 5704 | struct list_head *entry; |
bfe68a22 | 5705 | u32 tail, off = req->timeout.off; |
ad8a48ac | 5706 | |
733f5c95 | 5707 | spin_lock_irq(&ctx->completion_lock); |
93bd25bb | 5708 | |
5262f567 JA |
5709 | /* |
5710 | * sqe->off holds how many events that need to occur for this | |
93bd25bb JA |
5711 | * timeout event to be satisfied. If it isn't set, then this is |
5712 | * a pure timeout request, sequence isn't used. | |
5262f567 | 5713 | */ |
8eb7e2d0 | 5714 | if (io_is_timeout_noseq(req)) { |
93bd25bb JA |
5715 | entry = ctx->timeout_list.prev; |
5716 | goto add; | |
5717 | } | |
5262f567 | 5718 | |
bfe68a22 PB |
5719 | tail = ctx->cached_cq_tail - atomic_read(&ctx->cq_timeouts); |
5720 | req->timeout.target_seq = tail + off; | |
5262f567 JA |
5721 | |
5722 | /* | |
5723 | * Insertion sort, ensuring the first entry in the list is always | |
5724 | * the one we need first. | |
5725 | */ | |
5262f567 | 5726 | list_for_each_prev(entry, &ctx->timeout_list) { |
135fcde8 PB |
5727 | struct io_kiocb *nxt = list_entry(entry, struct io_kiocb, |
5728 | timeout.list); | |
5262f567 | 5729 | |
8eb7e2d0 | 5730 | if (io_is_timeout_noseq(nxt)) |
93bd25bb | 5731 | continue; |
bfe68a22 PB |
5732 | /* nxt.seq is behind @tail, otherwise would've been completed */ |
5733 | if (off >= nxt->timeout.target_seq - tail) | |
5262f567 JA |
5734 | break; |
5735 | } | |
93bd25bb | 5736 | add: |
135fcde8 | 5737 | list_add(&req->timeout.list, entry); |
ad8a48ac JA |
5738 | data->timer.function = io_timeout_fn; |
5739 | hrtimer_start(&data->timer, timespec64_to_ktime(data->ts), data->mode); | |
5262f567 | 5740 | spin_unlock_irq(&ctx->completion_lock); |
5262f567 JA |
5741 | return 0; |
5742 | } | |
5262f567 | 5743 | |
62755e35 JA |
5744 | static bool io_cancel_cb(struct io_wq_work *work, void *data) |
5745 | { | |
5746 | struct io_kiocb *req = container_of(work, struct io_kiocb, work); | |
5747 | ||
5748 | return req->user_data == (unsigned long) data; | |
5749 | } | |
5750 | ||
e977d6d3 | 5751 | static int io_async_cancel_one(struct io_ring_ctx *ctx, void *sqe_addr) |
62755e35 | 5752 | { |
62755e35 | 5753 | enum io_wq_cancel cancel_ret; |
62755e35 JA |
5754 | int ret = 0; |
5755 | ||
4f26bda1 | 5756 | cancel_ret = io_wq_cancel_cb(ctx->io_wq, io_cancel_cb, sqe_addr, false); |
62755e35 JA |
5757 | switch (cancel_ret) { |
5758 | case IO_WQ_CANCEL_OK: | |
5759 | ret = 0; | |
5760 | break; | |
5761 | case IO_WQ_CANCEL_RUNNING: | |
5762 | ret = -EALREADY; | |
5763 | break; | |
5764 | case IO_WQ_CANCEL_NOTFOUND: | |
5765 | ret = -ENOENT; | |
5766 | break; | |
5767 | } | |
5768 | ||
e977d6d3 JA |
5769 | return ret; |
5770 | } | |
5771 | ||
47f46768 JA |
5772 | static void io_async_find_and_cancel(struct io_ring_ctx *ctx, |
5773 | struct io_kiocb *req, __u64 sqe_addr, | |
014db007 | 5774 | int success_ret) |
47f46768 JA |
5775 | { |
5776 | unsigned long flags; | |
5777 | int ret; | |
5778 | ||
5779 | ret = io_async_cancel_one(ctx, (void *) (unsigned long) sqe_addr); | |
5780 | if (ret != -ENOENT) { | |
5781 | spin_lock_irqsave(&ctx->completion_lock, flags); | |
5782 | goto done; | |
5783 | } | |
5784 | ||
5785 | spin_lock_irqsave(&ctx->completion_lock, flags); | |
5786 | ret = io_timeout_cancel(ctx, sqe_addr); | |
5787 | if (ret != -ENOENT) | |
5788 | goto done; | |
5789 | ret = io_poll_cancel(ctx, sqe_addr); | |
5790 | done: | |
b0dd8a41 JA |
5791 | if (!ret) |
5792 | ret = success_ret; | |
47f46768 JA |
5793 | io_cqring_fill_event(req, ret); |
5794 | io_commit_cqring(ctx); | |
5795 | spin_unlock_irqrestore(&ctx->completion_lock, flags); | |
5796 | io_cqring_ev_posted(ctx); | |
5797 | ||
4e88d6e7 JA |
5798 | if (ret < 0) |
5799 | req_set_fail_links(req); | |
014db007 | 5800 | io_put_req(req); |
47f46768 JA |
5801 | } |
5802 | ||
3529d8c2 JA |
5803 | static int io_async_cancel_prep(struct io_kiocb *req, |
5804 | const struct io_uring_sqe *sqe) | |
e977d6d3 | 5805 | { |
fbf23849 | 5806 | if (unlikely(req->ctx->flags & IORING_SETUP_IOPOLL)) |
e977d6d3 | 5807 | return -EINVAL; |
61710e43 DA |
5808 | if (unlikely(req->flags & (REQ_F_FIXED_FILE | REQ_F_BUFFER_SELECT))) |
5809 | return -EINVAL; | |
5810 | if (sqe->ioprio || sqe->off || sqe->len || sqe->cancel_flags) | |
e977d6d3 JA |
5811 | return -EINVAL; |
5812 | ||
fbf23849 JA |
5813 | req->cancel.addr = READ_ONCE(sqe->addr); |
5814 | return 0; | |
5815 | } | |
5816 | ||
014db007 | 5817 | static int io_async_cancel(struct io_kiocb *req) |
fbf23849 JA |
5818 | { |
5819 | struct io_ring_ctx *ctx = req->ctx; | |
fbf23849 | 5820 | |
014db007 | 5821 | io_async_find_and_cancel(ctx, req, req->cancel.addr, 0); |
5262f567 JA |
5822 | return 0; |
5823 | } | |
5824 | ||
05f3fb3c JA |
5825 | static int io_files_update_prep(struct io_kiocb *req, |
5826 | const struct io_uring_sqe *sqe) | |
5827 | { | |
6ca56f84 JA |
5828 | if (unlikely(req->ctx->flags & IORING_SETUP_SQPOLL)) |
5829 | return -EINVAL; | |
61710e43 DA |
5830 | if (unlikely(req->flags & (REQ_F_FIXED_FILE | REQ_F_BUFFER_SELECT))) |
5831 | return -EINVAL; | |
5832 | if (sqe->ioprio || sqe->rw_flags) | |
05f3fb3c JA |
5833 | return -EINVAL; |
5834 | ||
5835 | req->files_update.offset = READ_ONCE(sqe->off); | |
5836 | req->files_update.nr_args = READ_ONCE(sqe->len); | |
5837 | if (!req->files_update.nr_args) | |
5838 | return -EINVAL; | |
5839 | req->files_update.arg = READ_ONCE(sqe->addr); | |
5840 | return 0; | |
5841 | } | |
5842 | ||
229a7b63 JA |
5843 | static int io_files_update(struct io_kiocb *req, bool force_nonblock, |
5844 | struct io_comp_state *cs) | |
fbf23849 JA |
5845 | { |
5846 | struct io_ring_ctx *ctx = req->ctx; | |
05f3fb3c JA |
5847 | struct io_uring_files_update up; |
5848 | int ret; | |
fbf23849 | 5849 | |
f86cd20c | 5850 | if (force_nonblock) |
05f3fb3c | 5851 | return -EAGAIN; |
05f3fb3c JA |
5852 | |
5853 | up.offset = req->files_update.offset; | |
5854 | up.fds = req->files_update.arg; | |
5855 | ||
5856 | mutex_lock(&ctx->uring_lock); | |
5857 | ret = __io_sqe_files_update(ctx, &up, req->files_update.nr_args); | |
5858 | mutex_unlock(&ctx->uring_lock); | |
5859 | ||
5860 | if (ret < 0) | |
5861 | req_set_fail_links(req); | |
229a7b63 | 5862 | __io_req_complete(req, ret, 0, cs); |
5262f567 JA |
5863 | return 0; |
5864 | } | |
5865 | ||
bfe76559 | 5866 | static int io_req_prep(struct io_kiocb *req, const struct io_uring_sqe *sqe) |
f67676d1 | 5867 | { |
d625c6ee | 5868 | switch (req->opcode) { |
e781573e | 5869 | case IORING_OP_NOP: |
bfe76559 | 5870 | return 0; |
f67676d1 JA |
5871 | case IORING_OP_READV: |
5872 | case IORING_OP_READ_FIXED: | |
3a6820f2 | 5873 | case IORING_OP_READ: |
bfe76559 | 5874 | return io_read_prep(req, sqe); |
f67676d1 JA |
5875 | case IORING_OP_WRITEV: |
5876 | case IORING_OP_WRITE_FIXED: | |
3a6820f2 | 5877 | case IORING_OP_WRITE: |
bfe76559 | 5878 | return io_write_prep(req, sqe); |
0969e783 | 5879 | case IORING_OP_POLL_ADD: |
bfe76559 | 5880 | return io_poll_add_prep(req, sqe); |
0969e783 | 5881 | case IORING_OP_POLL_REMOVE: |
bfe76559 | 5882 | return io_poll_remove_prep(req, sqe); |
8ed8d3c3 | 5883 | case IORING_OP_FSYNC: |
bfe76559 | 5884 | return io_prep_fsync(req, sqe); |
8ed8d3c3 | 5885 | case IORING_OP_SYNC_FILE_RANGE: |
bfe76559 | 5886 | return io_prep_sfr(req, sqe); |
03b1230c | 5887 | case IORING_OP_SENDMSG: |
fddaface | 5888 | case IORING_OP_SEND: |
bfe76559 | 5889 | return io_sendmsg_prep(req, sqe); |
03b1230c | 5890 | case IORING_OP_RECVMSG: |
fddaface | 5891 | case IORING_OP_RECV: |
bfe76559 | 5892 | return io_recvmsg_prep(req, sqe); |
f499a021 | 5893 | case IORING_OP_CONNECT: |
bfe76559 | 5894 | return io_connect_prep(req, sqe); |
2d28390a | 5895 | case IORING_OP_TIMEOUT: |
bfe76559 | 5896 | return io_timeout_prep(req, sqe, false); |
b29472ee | 5897 | case IORING_OP_TIMEOUT_REMOVE: |
bfe76559 | 5898 | return io_timeout_remove_prep(req, sqe); |
fbf23849 | 5899 | case IORING_OP_ASYNC_CANCEL: |
bfe76559 | 5900 | return io_async_cancel_prep(req, sqe); |
2d28390a | 5901 | case IORING_OP_LINK_TIMEOUT: |
bfe76559 | 5902 | return io_timeout_prep(req, sqe, true); |
8ed8d3c3 | 5903 | case IORING_OP_ACCEPT: |
bfe76559 | 5904 | return io_accept_prep(req, sqe); |
d63d1b5e | 5905 | case IORING_OP_FALLOCATE: |
bfe76559 | 5906 | return io_fallocate_prep(req, sqe); |
15b71abe | 5907 | case IORING_OP_OPENAT: |
bfe76559 | 5908 | return io_openat_prep(req, sqe); |
b5dba59e | 5909 | case IORING_OP_CLOSE: |
bfe76559 | 5910 | return io_close_prep(req, sqe); |
05f3fb3c | 5911 | case IORING_OP_FILES_UPDATE: |
bfe76559 | 5912 | return io_files_update_prep(req, sqe); |
eddc7ef5 | 5913 | case IORING_OP_STATX: |
bfe76559 | 5914 | return io_statx_prep(req, sqe); |
4840e418 | 5915 | case IORING_OP_FADVISE: |
bfe76559 | 5916 | return io_fadvise_prep(req, sqe); |
c1ca757b | 5917 | case IORING_OP_MADVISE: |
bfe76559 | 5918 | return io_madvise_prep(req, sqe); |
cebdb986 | 5919 | case IORING_OP_OPENAT2: |
bfe76559 | 5920 | return io_openat2_prep(req, sqe); |
3e4827b0 | 5921 | case IORING_OP_EPOLL_CTL: |
bfe76559 | 5922 | return io_epoll_ctl_prep(req, sqe); |
7d67af2c | 5923 | case IORING_OP_SPLICE: |
bfe76559 | 5924 | return io_splice_prep(req, sqe); |
ddf0322d | 5925 | case IORING_OP_PROVIDE_BUFFERS: |
bfe76559 | 5926 | return io_provide_buffers_prep(req, sqe); |
067524e9 | 5927 | case IORING_OP_REMOVE_BUFFERS: |
bfe76559 | 5928 | return io_remove_buffers_prep(req, sqe); |
f2a8d5c7 | 5929 | case IORING_OP_TEE: |
bfe76559 | 5930 | return io_tee_prep(req, sqe); |
36f4fa68 JA |
5931 | case IORING_OP_SHUTDOWN: |
5932 | return io_shutdown_prep(req, sqe); | |
80a261fd JA |
5933 | case IORING_OP_RENAMEAT: |
5934 | return io_renameat_prep(req, sqe); | |
f67676d1 JA |
5935 | } |
5936 | ||
bfe76559 PB |
5937 | printk_once(KERN_WARNING "io_uring: unhandled opcode %d\n", |
5938 | req->opcode); | |
5939 | return-EINVAL; | |
5940 | } | |
5941 | ||
5942 | static int io_req_defer_prep(struct io_kiocb *req, | |
5943 | const struct io_uring_sqe *sqe) | |
5944 | { | |
bfe76559 PB |
5945 | if (!sqe) |
5946 | return 0; | |
5947 | if (io_alloc_async_data(req)) | |
5948 | return -EAGAIN; | |
bfe76559 | 5949 | return io_req_prep(req, sqe); |
f67676d1 JA |
5950 | } |
5951 | ||
9cf7c104 PB |
5952 | static u32 io_get_sequence(struct io_kiocb *req) |
5953 | { | |
5954 | struct io_kiocb *pos; | |
5955 | struct io_ring_ctx *ctx = req->ctx; | |
5956 | u32 total_submitted, nr_reqs = 1; | |
5957 | ||
5958 | if (req->flags & REQ_F_LINK_HEAD) | |
5959 | list_for_each_entry(pos, &req->link_list, link_list) | |
5960 | nr_reqs++; | |
5961 | ||
5962 | total_submitted = ctx->cached_sq_head - ctx->cached_sq_dropped; | |
5963 | return total_submitted - nr_reqs; | |
5964 | } | |
5965 | ||
3529d8c2 | 5966 | static int io_req_defer(struct io_kiocb *req, const struct io_uring_sqe *sqe) |
de0617e4 | 5967 | { |
a197f664 | 5968 | struct io_ring_ctx *ctx = req->ctx; |
27dc8338 | 5969 | struct io_defer_entry *de; |
f67676d1 | 5970 | int ret; |
9cf7c104 | 5971 | u32 seq; |
de0617e4 | 5972 | |
9d858b21 | 5973 | /* Still need defer if there is pending req in defer list. */ |
9cf7c104 PB |
5974 | if (likely(list_empty_careful(&ctx->defer_list) && |
5975 | !(req->flags & REQ_F_IO_DRAIN))) | |
5976 | return 0; | |
5977 | ||
5978 | seq = io_get_sequence(req); | |
5979 | /* Still a chance to pass the sequence check */ | |
5980 | if (!req_need_defer(req, seq) && list_empty_careful(&ctx->defer_list)) | |
de0617e4 JA |
5981 | return 0; |
5982 | ||
e8c2bc1f | 5983 | if (!req->async_data) { |
650b5481 | 5984 | ret = io_req_defer_prep(req, sqe); |
327d6d96 | 5985 | if (ret) |
650b5481 PB |
5986 | return ret; |
5987 | } | |
cbdcb435 | 5988 | io_prep_async_link(req); |
27dc8338 PB |
5989 | de = kmalloc(sizeof(*de), GFP_KERNEL); |
5990 | if (!de) | |
5991 | return -ENOMEM; | |
2d28390a | 5992 | |
de0617e4 | 5993 | spin_lock_irq(&ctx->completion_lock); |
9cf7c104 | 5994 | if (!req_need_defer(req, seq) && list_empty(&ctx->defer_list)) { |
de0617e4 | 5995 | spin_unlock_irq(&ctx->completion_lock); |
27dc8338 | 5996 | kfree(de); |
ae34817b PB |
5997 | io_queue_async_work(req); |
5998 | return -EIOCBQUEUED; | |
de0617e4 JA |
5999 | } |
6000 | ||
915967f6 | 6001 | trace_io_uring_defer(ctx, req, req->user_data); |
27dc8338 | 6002 | de->req = req; |
9cf7c104 | 6003 | de->seq = seq; |
27dc8338 | 6004 | list_add_tail(&de->list, &ctx->defer_list); |
de0617e4 JA |
6005 | spin_unlock_irq(&ctx->completion_lock); |
6006 | return -EIOCBQUEUED; | |
6007 | } | |
6008 | ||
f573d384 | 6009 | static void io_req_drop_files(struct io_kiocb *req) |
99bc4c38 | 6010 | { |
f573d384 JA |
6011 | struct io_ring_ctx *ctx = req->ctx; |
6012 | unsigned long flags; | |
6013 | ||
6014 | spin_lock_irqsave(&ctx->inflight_lock, flags); | |
6015 | list_del(&req->inflight_entry); | |
6016 | if (waitqueue_active(&ctx->inflight_wait)) | |
6017 | wake_up(&ctx->inflight_wait); | |
6018 | spin_unlock_irqrestore(&ctx->inflight_lock, flags); | |
6019 | req->flags &= ~REQ_F_INFLIGHT; | |
98447d65 JA |
6020 | put_files_struct(req->work.identity->files); |
6021 | put_nsproxy(req->work.identity->nsproxy); | |
dfead8a8 | 6022 | req->work.flags &= ~IO_WQ_WORK_FILES; |
f573d384 | 6023 | } |
99bc4c38 | 6024 | |
3ca405eb | 6025 | static void __io_clean_op(struct io_kiocb *req) |
99bc4c38 | 6026 | { |
0e1b6fe3 PB |
6027 | if (req->flags & REQ_F_BUFFER_SELECTED) { |
6028 | switch (req->opcode) { | |
6029 | case IORING_OP_READV: | |
6030 | case IORING_OP_READ_FIXED: | |
6031 | case IORING_OP_READ: | |
bcda7baa | 6032 | kfree((void *)(unsigned long)req->rw.addr); |
0e1b6fe3 PB |
6033 | break; |
6034 | case IORING_OP_RECVMSG: | |
6035 | case IORING_OP_RECV: | |
bcda7baa | 6036 | kfree(req->sr_msg.kbuf); |
0e1b6fe3 PB |
6037 | break; |
6038 | } | |
6039 | req->flags &= ~REQ_F_BUFFER_SELECTED; | |
99bc4c38 PB |
6040 | } |
6041 | ||
0e1b6fe3 PB |
6042 | if (req->flags & REQ_F_NEED_CLEANUP) { |
6043 | switch (req->opcode) { | |
6044 | case IORING_OP_READV: | |
6045 | case IORING_OP_READ_FIXED: | |
6046 | case IORING_OP_READ: | |
6047 | case IORING_OP_WRITEV: | |
6048 | case IORING_OP_WRITE_FIXED: | |
e8c2bc1f JA |
6049 | case IORING_OP_WRITE: { |
6050 | struct io_async_rw *io = req->async_data; | |
6051 | if (io->free_iovec) | |
6052 | kfree(io->free_iovec); | |
0e1b6fe3 | 6053 | break; |
e8c2bc1f | 6054 | } |
0e1b6fe3 | 6055 | case IORING_OP_RECVMSG: |
e8c2bc1f JA |
6056 | case IORING_OP_SENDMSG: { |
6057 | struct io_async_msghdr *io = req->async_data; | |
6058 | if (io->iov != io->fast_iov) | |
6059 | kfree(io->iov); | |
0e1b6fe3 | 6060 | break; |
e8c2bc1f | 6061 | } |
0e1b6fe3 PB |
6062 | case IORING_OP_SPLICE: |
6063 | case IORING_OP_TEE: | |
6064 | io_put_file(req, req->splice.file_in, | |
6065 | (req->splice.flags & SPLICE_F_FD_IN_FIXED)); | |
6066 | break; | |
f3cd4850 JA |
6067 | case IORING_OP_OPENAT: |
6068 | case IORING_OP_OPENAT2: | |
6069 | if (req->open.filename) | |
6070 | putname(req->open.filename); | |
6071 | break; | |
80a261fd JA |
6072 | case IORING_OP_RENAMEAT: |
6073 | putname(req->rename.oldpath); | |
6074 | putname(req->rename.newpath); | |
6075 | break; | |
0e1b6fe3 PB |
6076 | } |
6077 | req->flags &= ~REQ_F_NEED_CLEANUP; | |
99bc4c38 | 6078 | } |
bb175342 | 6079 | |
f573d384 JA |
6080 | if (req->flags & REQ_F_INFLIGHT) |
6081 | io_req_drop_files(req); | |
99bc4c38 PB |
6082 | } |
6083 | ||
c1379e24 PB |
6084 | static int io_issue_sqe(struct io_kiocb *req, bool force_nonblock, |
6085 | struct io_comp_state *cs) | |
2b188cc1 | 6086 | { |
a197f664 | 6087 | struct io_ring_ctx *ctx = req->ctx; |
d625c6ee | 6088 | int ret; |
2b188cc1 | 6089 | |
d625c6ee | 6090 | switch (req->opcode) { |
2b188cc1 | 6091 | case IORING_OP_NOP: |
229a7b63 | 6092 | ret = io_nop(req, cs); |
2b188cc1 JA |
6093 | break; |
6094 | case IORING_OP_READV: | |
edafccee | 6095 | case IORING_OP_READ_FIXED: |
3a6820f2 | 6096 | case IORING_OP_READ: |
a1d7c393 | 6097 | ret = io_read(req, force_nonblock, cs); |
edafccee | 6098 | break; |
3529d8c2 | 6099 | case IORING_OP_WRITEV: |
edafccee | 6100 | case IORING_OP_WRITE_FIXED: |
3a6820f2 | 6101 | case IORING_OP_WRITE: |
a1d7c393 | 6102 | ret = io_write(req, force_nonblock, cs); |
2b188cc1 | 6103 | break; |
c992fe29 | 6104 | case IORING_OP_FSYNC: |
014db007 | 6105 | ret = io_fsync(req, force_nonblock); |
c992fe29 | 6106 | break; |
221c5eb2 | 6107 | case IORING_OP_POLL_ADD: |
014db007 | 6108 | ret = io_poll_add(req); |
221c5eb2 JA |
6109 | break; |
6110 | case IORING_OP_POLL_REMOVE: | |
fc4df999 | 6111 | ret = io_poll_remove(req); |
221c5eb2 | 6112 | break; |
5d17b4a4 | 6113 | case IORING_OP_SYNC_FILE_RANGE: |
014db007 | 6114 | ret = io_sync_file_range(req, force_nonblock); |
5d17b4a4 | 6115 | break; |
0fa03c62 | 6116 | case IORING_OP_SENDMSG: |
062d04d7 PB |
6117 | ret = io_sendmsg(req, force_nonblock, cs); |
6118 | break; | |
fddaface | 6119 | case IORING_OP_SEND: |
062d04d7 | 6120 | ret = io_send(req, force_nonblock, cs); |
0fa03c62 | 6121 | break; |
aa1fa28f | 6122 | case IORING_OP_RECVMSG: |
062d04d7 PB |
6123 | ret = io_recvmsg(req, force_nonblock, cs); |
6124 | break; | |
fddaface | 6125 | case IORING_OP_RECV: |
062d04d7 | 6126 | ret = io_recv(req, force_nonblock, cs); |
aa1fa28f | 6127 | break; |
5262f567 | 6128 | case IORING_OP_TIMEOUT: |
fc4df999 | 6129 | ret = io_timeout(req); |
5262f567 | 6130 | break; |
11365043 | 6131 | case IORING_OP_TIMEOUT_REMOVE: |
fc4df999 | 6132 | ret = io_timeout_remove(req); |
11365043 | 6133 | break; |
17f2fe35 | 6134 | case IORING_OP_ACCEPT: |
229a7b63 | 6135 | ret = io_accept(req, force_nonblock, cs); |
17f2fe35 | 6136 | break; |
f8e85cf2 | 6137 | case IORING_OP_CONNECT: |
229a7b63 | 6138 | ret = io_connect(req, force_nonblock, cs); |
f8e85cf2 | 6139 | break; |
62755e35 | 6140 | case IORING_OP_ASYNC_CANCEL: |
014db007 | 6141 | ret = io_async_cancel(req); |
62755e35 | 6142 | break; |
d63d1b5e | 6143 | case IORING_OP_FALLOCATE: |
014db007 | 6144 | ret = io_fallocate(req, force_nonblock); |
d63d1b5e | 6145 | break; |
15b71abe | 6146 | case IORING_OP_OPENAT: |
014db007 | 6147 | ret = io_openat(req, force_nonblock); |
15b71abe | 6148 | break; |
b5dba59e | 6149 | case IORING_OP_CLOSE: |
229a7b63 | 6150 | ret = io_close(req, force_nonblock, cs); |
b5dba59e | 6151 | break; |
05f3fb3c | 6152 | case IORING_OP_FILES_UPDATE: |
229a7b63 | 6153 | ret = io_files_update(req, force_nonblock, cs); |
05f3fb3c | 6154 | break; |
eddc7ef5 | 6155 | case IORING_OP_STATX: |
014db007 | 6156 | ret = io_statx(req, force_nonblock); |
eddc7ef5 | 6157 | break; |
4840e418 | 6158 | case IORING_OP_FADVISE: |
014db007 | 6159 | ret = io_fadvise(req, force_nonblock); |
4840e418 | 6160 | break; |
c1ca757b | 6161 | case IORING_OP_MADVISE: |
014db007 | 6162 | ret = io_madvise(req, force_nonblock); |
c1ca757b | 6163 | break; |
cebdb986 | 6164 | case IORING_OP_OPENAT2: |
014db007 | 6165 | ret = io_openat2(req, force_nonblock); |
cebdb986 | 6166 | break; |
3e4827b0 | 6167 | case IORING_OP_EPOLL_CTL: |
229a7b63 | 6168 | ret = io_epoll_ctl(req, force_nonblock, cs); |
3e4827b0 | 6169 | break; |
7d67af2c | 6170 | case IORING_OP_SPLICE: |
014db007 | 6171 | ret = io_splice(req, force_nonblock); |
7d67af2c | 6172 | break; |
ddf0322d | 6173 | case IORING_OP_PROVIDE_BUFFERS: |
229a7b63 | 6174 | ret = io_provide_buffers(req, force_nonblock, cs); |
ddf0322d | 6175 | break; |
067524e9 | 6176 | case IORING_OP_REMOVE_BUFFERS: |
229a7b63 | 6177 | ret = io_remove_buffers(req, force_nonblock, cs); |
3e4827b0 | 6178 | break; |
f2a8d5c7 | 6179 | case IORING_OP_TEE: |
f2a8d5c7 PB |
6180 | ret = io_tee(req, force_nonblock); |
6181 | break; | |
36f4fa68 JA |
6182 | case IORING_OP_SHUTDOWN: |
6183 | ret = io_shutdown(req, force_nonblock); | |
6184 | break; | |
80a261fd JA |
6185 | case IORING_OP_RENAMEAT: |
6186 | ret = io_renameat(req, force_nonblock); | |
6187 | break; | |
2b188cc1 JA |
6188 | default: |
6189 | ret = -EINVAL; | |
6190 | break; | |
6191 | } | |
6192 | ||
def596e9 JA |
6193 | if (ret) |
6194 | return ret; | |
6195 | ||
b532576e JA |
6196 | /* If the op doesn't have a file, we're not polling for it */ |
6197 | if ((ctx->flags & IORING_SETUP_IOPOLL) && req->file) { | |
11ba820b JA |
6198 | const bool in_async = io_wq_current_is_worker(); |
6199 | ||
11ba820b JA |
6200 | /* workqueue context doesn't hold uring_lock, grab it now */ |
6201 | if (in_async) | |
6202 | mutex_lock(&ctx->uring_lock); | |
6203 | ||
def596e9 | 6204 | io_iopoll_req_issued(req); |
11ba820b JA |
6205 | |
6206 | if (in_async) | |
6207 | mutex_unlock(&ctx->uring_lock); | |
def596e9 JA |
6208 | } |
6209 | ||
6210 | return 0; | |
2b188cc1 JA |
6211 | } |
6212 | ||
f4db7182 | 6213 | static struct io_wq_work *io_wq_submit_work(struct io_wq_work *work) |
2b188cc1 JA |
6214 | { |
6215 | struct io_kiocb *req = container_of(work, struct io_kiocb, work); | |
6df1db6b | 6216 | struct io_kiocb *timeout; |
561fb04a | 6217 | int ret = 0; |
2b188cc1 | 6218 | |
6df1db6b PB |
6219 | timeout = io_prep_linked_timeout(req); |
6220 | if (timeout) | |
6221 | io_queue_linked_timeout(timeout); | |
d4c81f38 | 6222 | |
0c9d5ccd JA |
6223 | /* if NO_CANCEL is set, we must still run the work */ |
6224 | if ((work->flags & (IO_WQ_WORK_CANCEL|IO_WQ_WORK_NO_CANCEL)) == | |
6225 | IO_WQ_WORK_CANCEL) { | |
561fb04a | 6226 | ret = -ECANCELED; |
0c9d5ccd | 6227 | } |
31b51510 | 6228 | |
561fb04a | 6229 | if (!ret) { |
561fb04a | 6230 | do { |
c1379e24 | 6231 | ret = io_issue_sqe(req, false, NULL); |
561fb04a JA |
6232 | /* |
6233 | * We can get EAGAIN for polled IO even though we're | |
6234 | * forcing a sync submission from here, since we can't | |
6235 | * wait for request slots on the block side. | |
6236 | */ | |
6237 | if (ret != -EAGAIN) | |
6238 | break; | |
6239 | cond_resched(); | |
6240 | } while (1); | |
6241 | } | |
31b51510 | 6242 | |
561fb04a | 6243 | if (ret) { |
4e88d6e7 | 6244 | req_set_fail_links(req); |
e1e16097 | 6245 | io_req_complete(req, ret); |
edafccee | 6246 | } |
2b188cc1 | 6247 | |
f4db7182 | 6248 | return io_steal_work(req); |
2b188cc1 JA |
6249 | } |
6250 | ||
65e19f54 JA |
6251 | static inline struct file *io_file_from_index(struct io_ring_ctx *ctx, |
6252 | int index) | |
6253 | { | |
6254 | struct fixed_file_table *table; | |
6255 | ||
05f3fb3c | 6256 | table = &ctx->file_data->table[index >> IORING_FILE_TABLE_SHIFT]; |
84695089 | 6257 | return table->files[index & IORING_FILE_TABLE_MASK]; |
65e19f54 JA |
6258 | } |
6259 | ||
8371adf5 PB |
6260 | static struct file *io_file_get(struct io_submit_state *state, |
6261 | struct io_kiocb *req, int fd, bool fixed) | |
09bb8394 | 6262 | { |
a197f664 | 6263 | struct io_ring_ctx *ctx = req->ctx; |
8da11c19 | 6264 | struct file *file; |
09bb8394 | 6265 | |
8da11c19 | 6266 | if (fixed) { |
479f517b | 6267 | if (unlikely((unsigned int)fd >= ctx->nr_user_files)) |
8371adf5 | 6268 | return NULL; |
b7620121 | 6269 | fd = array_index_nospec(fd, ctx->nr_user_files); |
8da11c19 | 6270 | file = io_file_from_index(ctx, fd); |
fd2206e4 | 6271 | if (file) { |
b2e96852 | 6272 | req->fixed_file_refs = &ctx->file_data->node->refs; |
fd2206e4 JA |
6273 | percpu_ref_get(req->fixed_file_refs); |
6274 | } | |
09bb8394 | 6275 | } else { |
c826bd7a | 6276 | trace_io_uring_file_get(ctx, fd); |
8da11c19 | 6277 | file = __io_file_get(state, fd); |
09bb8394 JA |
6278 | } |
6279 | ||
8371adf5 | 6280 | return file; |
09bb8394 JA |
6281 | } |
6282 | ||
8da11c19 | 6283 | static int io_req_set_file(struct io_submit_state *state, struct io_kiocb *req, |
63ff8223 | 6284 | int fd) |
8da11c19 | 6285 | { |
28cea78a | 6286 | req->file = io_file_get(state, req, fd, req->flags & REQ_F_FIXED_FILE); |
8371adf5 | 6287 | if (req->file || io_op_defs[req->opcode].needs_file_no_error) |
f86cd20c | 6288 | return 0; |
8371adf5 | 6289 | return -EBADF; |
f56040b8 PB |
6290 | } |
6291 | ||
2665abfd | 6292 | static enum hrtimer_restart io_link_timeout_fn(struct hrtimer *timer) |
2b188cc1 | 6293 | { |
ad8a48ac JA |
6294 | struct io_timeout_data *data = container_of(timer, |
6295 | struct io_timeout_data, timer); | |
6296 | struct io_kiocb *req = data->req; | |
2665abfd JA |
6297 | struct io_ring_ctx *ctx = req->ctx; |
6298 | struct io_kiocb *prev = NULL; | |
6299 | unsigned long flags; | |
2665abfd JA |
6300 | |
6301 | spin_lock_irqsave(&ctx->completion_lock, flags); | |
6302 | ||
6303 | /* | |
6304 | * We don't expect the list to be empty, that will only happen if we | |
6305 | * race with the completion of the linked work. | |
6306 | */ | |
4493233e PB |
6307 | if (!list_empty(&req->link_list)) { |
6308 | prev = list_entry(req->link_list.prev, struct io_kiocb, | |
6309 | link_list); | |
900fad45 | 6310 | if (refcount_inc_not_zero(&prev->refs)) |
4493233e | 6311 | list_del_init(&req->link_list); |
900fad45 | 6312 | else |
76a46e06 | 6313 | prev = NULL; |
2665abfd JA |
6314 | } |
6315 | ||
6316 | spin_unlock_irqrestore(&ctx->completion_lock, flags); | |
6317 | ||
6318 | if (prev) { | |
4e88d6e7 | 6319 | req_set_fail_links(prev); |
014db007 | 6320 | io_async_find_and_cancel(ctx, req, prev->user_data, -ETIME); |
76a46e06 | 6321 | io_put_req(prev); |
47f46768 | 6322 | } else { |
e1e16097 | 6323 | io_req_complete(req, -ETIME); |
2665abfd | 6324 | } |
2665abfd JA |
6325 | return HRTIMER_NORESTART; |
6326 | } | |
6327 | ||
7271ef3a | 6328 | static void __io_queue_linked_timeout(struct io_kiocb *req) |
2665abfd | 6329 | { |
76a46e06 JA |
6330 | /* |
6331 | * If the list is now empty, then our linked request finished before | |
6332 | * we got a chance to setup the timer | |
6333 | */ | |
4493233e | 6334 | if (!list_empty(&req->link_list)) { |
e8c2bc1f | 6335 | struct io_timeout_data *data = req->async_data; |
94ae5e77 | 6336 | |
ad8a48ac JA |
6337 | data->timer.function = io_link_timeout_fn; |
6338 | hrtimer_start(&data->timer, timespec64_to_ktime(data->ts), | |
6339 | data->mode); | |
2665abfd | 6340 | } |
7271ef3a JA |
6341 | } |
6342 | ||
6343 | static void io_queue_linked_timeout(struct io_kiocb *req) | |
6344 | { | |
6345 | struct io_ring_ctx *ctx = req->ctx; | |
6346 | ||
6347 | spin_lock_irq(&ctx->completion_lock); | |
6348 | __io_queue_linked_timeout(req); | |
76a46e06 | 6349 | spin_unlock_irq(&ctx->completion_lock); |
2665abfd | 6350 | |
2665abfd | 6351 | /* drop submission reference */ |
76a46e06 JA |
6352 | io_put_req(req); |
6353 | } | |
2665abfd | 6354 | |
ad8a48ac | 6355 | static struct io_kiocb *io_prep_linked_timeout(struct io_kiocb *req) |
2665abfd JA |
6356 | { |
6357 | struct io_kiocb *nxt; | |
6358 | ||
dea3b49c | 6359 | if (!(req->flags & REQ_F_LINK_HEAD)) |
2665abfd | 6360 | return NULL; |
6df1db6b | 6361 | if (req->flags & REQ_F_LINK_TIMEOUT) |
d7718a9d | 6362 | return NULL; |
2665abfd | 6363 | |
4493233e PB |
6364 | nxt = list_first_entry_or_null(&req->link_list, struct io_kiocb, |
6365 | link_list); | |
d625c6ee | 6366 | if (!nxt || nxt->opcode != IORING_OP_LINK_TIMEOUT) |
76a46e06 | 6367 | return NULL; |
2665abfd | 6368 | |
900fad45 | 6369 | nxt->flags |= REQ_F_LTIMEOUT_ACTIVE; |
76a46e06 | 6370 | req->flags |= REQ_F_LINK_TIMEOUT; |
76a46e06 | 6371 | return nxt; |
2665abfd JA |
6372 | } |
6373 | ||
c1379e24 | 6374 | static void __io_queue_sqe(struct io_kiocb *req, struct io_comp_state *cs) |
2b188cc1 | 6375 | { |
4a0a7a18 | 6376 | struct io_kiocb *linked_timeout; |
193155c8 | 6377 | const struct cred *old_creds = NULL; |
e0c5c576 | 6378 | int ret; |
2b188cc1 | 6379 | |
4a0a7a18 JA |
6380 | again: |
6381 | linked_timeout = io_prep_linked_timeout(req); | |
6382 | ||
2e5aa6cb PB |
6383 | if ((req->flags & REQ_F_WORK_INITIALIZED) && |
6384 | (req->work.flags & IO_WQ_WORK_CREDS) && | |
98447d65 | 6385 | req->work.identity->creds != current_cred()) { |
193155c8 JA |
6386 | if (old_creds) |
6387 | revert_creds(old_creds); | |
98447d65 | 6388 | if (old_creds == req->work.identity->creds) |
193155c8 JA |
6389 | old_creds = NULL; /* restored original creds */ |
6390 | else | |
98447d65 | 6391 | old_creds = override_creds(req->work.identity->creds); |
193155c8 JA |
6392 | } |
6393 | ||
c1379e24 | 6394 | ret = io_issue_sqe(req, true, cs); |
491381ce JA |
6395 | |
6396 | /* | |
6397 | * We async punt it if the file wasn't marked NOWAIT, or if the file | |
6398 | * doesn't support non-blocking read/write attempts | |
6399 | */ | |
24c74678 | 6400 | if (ret == -EAGAIN && !(req->flags & REQ_F_NOWAIT)) { |
f063c547 | 6401 | if (!io_arm_poll_handler(req)) { |
f063c547 PB |
6402 | /* |
6403 | * Queued up for async execution, worker will release | |
6404 | * submit reference when the iocb is actually submitted. | |
6405 | */ | |
6406 | io_queue_async_work(req); | |
2b188cc1 | 6407 | } |
bbad27b2 | 6408 | |
f063c547 PB |
6409 | if (linked_timeout) |
6410 | io_queue_linked_timeout(linked_timeout); | |
0d63c148 PB |
6411 | } else if (likely(!ret)) { |
6412 | /* drop submission reference */ | |
6413 | req = io_put_req_find_next(req); | |
6414 | if (linked_timeout) | |
6415 | io_queue_linked_timeout(linked_timeout); | |
e65ef56d | 6416 | |
0d63c148 PB |
6417 | if (req) { |
6418 | if (!(req->flags & REQ_F_FORCE_ASYNC)) | |
6419 | goto again; | |
6420 | io_queue_async_work(req); | |
6421 | } | |
6422 | } else { | |
652532ad PB |
6423 | /* un-prep timeout, so it'll be killed as any other linked */ |
6424 | req->flags &= ~REQ_F_LINK_TIMEOUT; | |
4e88d6e7 | 6425 | req_set_fail_links(req); |
e65ef56d | 6426 | io_put_req(req); |
e1e16097 | 6427 | io_req_complete(req, ret); |
9e645e11 | 6428 | } |
652532ad | 6429 | |
193155c8 JA |
6430 | if (old_creds) |
6431 | revert_creds(old_creds); | |
2b188cc1 JA |
6432 | } |
6433 | ||
f13fad7b JA |
6434 | static void io_queue_sqe(struct io_kiocb *req, const struct io_uring_sqe *sqe, |
6435 | struct io_comp_state *cs) | |
4fe2c963 JL |
6436 | { |
6437 | int ret; | |
6438 | ||
3529d8c2 | 6439 | ret = io_req_defer(req, sqe); |
4fe2c963 JL |
6440 | if (ret) { |
6441 | if (ret != -EIOCBQUEUED) { | |
1118591a | 6442 | fail_req: |
4e88d6e7 | 6443 | req_set_fail_links(req); |
e1e16097 JA |
6444 | io_put_req(req); |
6445 | io_req_complete(req, ret); | |
4fe2c963 | 6446 | } |
2550878f | 6447 | } else if (req->flags & REQ_F_FORCE_ASYNC) { |
e8c2bc1f | 6448 | if (!req->async_data) { |
bd2ab18a | 6449 | ret = io_req_defer_prep(req, sqe); |
327d6d96 | 6450 | if (unlikely(ret)) |
bd2ab18a PB |
6451 | goto fail_req; |
6452 | } | |
ce35a47a JA |
6453 | io_queue_async_work(req); |
6454 | } else { | |
c1379e24 PB |
6455 | if (sqe) { |
6456 | ret = io_req_prep(req, sqe); | |
6457 | if (unlikely(ret)) | |
6458 | goto fail_req; | |
6459 | } | |
6460 | __io_queue_sqe(req, cs); | |
ce35a47a | 6461 | } |
4fe2c963 JL |
6462 | } |
6463 | ||
f13fad7b JA |
6464 | static inline void io_queue_link_head(struct io_kiocb *req, |
6465 | struct io_comp_state *cs) | |
4fe2c963 | 6466 | { |
94ae5e77 | 6467 | if (unlikely(req->flags & REQ_F_FAIL_LINK)) { |
e1e16097 JA |
6468 | io_put_req(req); |
6469 | io_req_complete(req, -ECANCELED); | |
1b4a51b6 | 6470 | } else |
f13fad7b | 6471 | io_queue_sqe(req, NULL, cs); |
4fe2c963 JL |
6472 | } |
6473 | ||
1d4240cc | 6474 | static int io_submit_sqe(struct io_kiocb *req, const struct io_uring_sqe *sqe, |
f13fad7b | 6475 | struct io_kiocb **link, struct io_comp_state *cs) |
9e645e11 | 6476 | { |
a197f664 | 6477 | struct io_ring_ctx *ctx = req->ctx; |
ef4ff581 | 6478 | int ret; |
9e645e11 | 6479 | |
9e645e11 JA |
6480 | /* |
6481 | * If we already have a head request, queue this one for async | |
6482 | * submittal once the head completes. If we don't have a head but | |
6483 | * IOSQE_IO_LINK is set in the sqe, start a new head. This one will be | |
6484 | * submitted sync once the chain is complete. If none of those | |
6485 | * conditions are true (normal request), then just queue it. | |
6486 | */ | |
6487 | if (*link) { | |
9d76377f | 6488 | struct io_kiocb *head = *link; |
4e88d6e7 | 6489 | |
8cdf2193 PB |
6490 | /* |
6491 | * Taking sequential execution of a link, draining both sides | |
6492 | * of the link also fullfils IOSQE_IO_DRAIN semantics for all | |
6493 | * requests in the link. So, it drains the head and the | |
6494 | * next after the link request. The last one is done via | |
6495 | * drain_next flag to persist the effect across calls. | |
6496 | */ | |
ef4ff581 | 6497 | if (req->flags & REQ_F_IO_DRAIN) { |
711be031 PB |
6498 | head->flags |= REQ_F_IO_DRAIN; |
6499 | ctx->drain_next = 1; | |
6500 | } | |
3529d8c2 | 6501 | ret = io_req_defer_prep(req, sqe); |
327d6d96 | 6502 | if (unlikely(ret)) { |
4e88d6e7 | 6503 | /* fail even hard links since we don't submit */ |
9d76377f | 6504 | head->flags |= REQ_F_FAIL_LINK; |
1d4240cc | 6505 | return ret; |
2d28390a | 6506 | } |
9d76377f PB |
6507 | trace_io_uring_link(ctx, req, head); |
6508 | list_add_tail(&req->link_list, &head->link_list); | |
32fe525b PB |
6509 | |
6510 | /* last request of a link, enqueue the link */ | |
ef4ff581 | 6511 | if (!(req->flags & (REQ_F_LINK | REQ_F_HARDLINK))) { |
f13fad7b | 6512 | io_queue_link_head(head, cs); |
32fe525b PB |
6513 | *link = NULL; |
6514 | } | |
9e645e11 | 6515 | } else { |
711be031 PB |
6516 | if (unlikely(ctx->drain_next)) { |
6517 | req->flags |= REQ_F_IO_DRAIN; | |
ef4ff581 | 6518 | ctx->drain_next = 0; |
711be031 | 6519 | } |
ef4ff581 | 6520 | if (req->flags & (REQ_F_LINK | REQ_F_HARDLINK)) { |
dea3b49c | 6521 | req->flags |= REQ_F_LINK_HEAD; |
711be031 | 6522 | INIT_LIST_HEAD(&req->link_list); |
f1d96a8f | 6523 | |
711be031 | 6524 | ret = io_req_defer_prep(req, sqe); |
327d6d96 | 6525 | if (unlikely(ret)) |
711be031 PB |
6526 | req->flags |= REQ_F_FAIL_LINK; |
6527 | *link = req; | |
6528 | } else { | |
f13fad7b | 6529 | io_queue_sqe(req, sqe, cs); |
711be031 | 6530 | } |
9e645e11 | 6531 | } |
2e6e1fde | 6532 | |
1d4240cc | 6533 | return 0; |
9e645e11 JA |
6534 | } |
6535 | ||
9a56a232 JA |
6536 | /* |
6537 | * Batched submission is done, ensure local IO is flushed out. | |
6538 | */ | |
6539 | static void io_submit_state_end(struct io_submit_state *state) | |
6540 | { | |
f13fad7b JA |
6541 | if (!list_empty(&state->comp.list)) |
6542 | io_submit_flush_completions(&state->comp); | |
9a56a232 | 6543 | blk_finish_plug(&state->plug); |
9f13c35b | 6544 | io_state_file_put(state); |
2579f913 | 6545 | if (state->free_reqs) |
6c8a3134 | 6546 | kmem_cache_free_bulk(req_cachep, state->free_reqs, state->reqs); |
9a56a232 JA |
6547 | } |
6548 | ||
6549 | /* | |
6550 | * Start submission side cache. | |
6551 | */ | |
6552 | static void io_submit_state_start(struct io_submit_state *state, | |
013538bd | 6553 | struct io_ring_ctx *ctx, unsigned int max_ios) |
9a56a232 JA |
6554 | { |
6555 | blk_start_plug(&state->plug); | |
013538bd JA |
6556 | state->comp.nr = 0; |
6557 | INIT_LIST_HEAD(&state->comp.list); | |
6558 | state->comp.ctx = ctx; | |
2579f913 | 6559 | state->free_reqs = 0; |
9a56a232 JA |
6560 | state->file = NULL; |
6561 | state->ios_left = max_ios; | |
6562 | } | |
6563 | ||
2b188cc1 JA |
6564 | static void io_commit_sqring(struct io_ring_ctx *ctx) |
6565 | { | |
75b28aff | 6566 | struct io_rings *rings = ctx->rings; |
2b188cc1 | 6567 | |
caf582c6 PB |
6568 | /* |
6569 | * Ensure any loads from the SQEs are done at this point, | |
6570 | * since once we write the new head, the application could | |
6571 | * write new data to them. | |
6572 | */ | |
6573 | smp_store_release(&rings->sq.head, ctx->cached_sq_head); | |
2b188cc1 JA |
6574 | } |
6575 | ||
2b188cc1 | 6576 | /* |
3529d8c2 | 6577 | * Fetch an sqe, if one is available. Note that sqe_ptr will point to memory |
2b188cc1 JA |
6578 | * that is mapped by userspace. This means that care needs to be taken to |
6579 | * ensure that reads are stable, as we cannot rely on userspace always | |
6580 | * being a good citizen. If members of the sqe are validated and then later | |
6581 | * used, it's important that those reads are done through READ_ONCE() to | |
6582 | * prevent a re-load down the line. | |
6583 | */ | |
709b302f | 6584 | static const struct io_uring_sqe *io_get_sqe(struct io_ring_ctx *ctx) |
2b188cc1 | 6585 | { |
75b28aff | 6586 | u32 *sq_array = ctx->sq_array; |
2b188cc1 JA |
6587 | unsigned head; |
6588 | ||
6589 | /* | |
6590 | * The cached sq head (or cq tail) serves two purposes: | |
6591 | * | |
6592 | * 1) allows us to batch the cost of updating the user visible | |
6593 | * head updates. | |
6594 | * 2) allows the kernel side to track the head on its own, even | |
6595 | * though the application is the one updating it. | |
6596 | */ | |
ee7d46d9 | 6597 | head = READ_ONCE(sq_array[ctx->cached_sq_head & ctx->sq_mask]); |
709b302f PB |
6598 | if (likely(head < ctx->sq_entries)) |
6599 | return &ctx->sq_sqes[head]; | |
2b188cc1 JA |
6600 | |
6601 | /* drop invalid entries */ | |
498ccd9e | 6602 | ctx->cached_sq_dropped++; |
ee7d46d9 | 6603 | WRITE_ONCE(ctx->rings->sq_dropped, ctx->cached_sq_dropped); |
709b302f PB |
6604 | return NULL; |
6605 | } | |
6606 | ||
6607 | static inline void io_consume_sqe(struct io_ring_ctx *ctx) | |
6608 | { | |
6609 | ctx->cached_sq_head++; | |
2b188cc1 JA |
6610 | } |
6611 | ||
21b55dbc SG |
6612 | /* |
6613 | * Check SQE restrictions (opcode and flags). | |
6614 | * | |
6615 | * Returns 'true' if SQE is allowed, 'false' otherwise. | |
6616 | */ | |
6617 | static inline bool io_check_restriction(struct io_ring_ctx *ctx, | |
6618 | struct io_kiocb *req, | |
6619 | unsigned int sqe_flags) | |
6620 | { | |
6621 | if (!ctx->restricted) | |
6622 | return true; | |
6623 | ||
6624 | if (!test_bit(req->opcode, ctx->restrictions.sqe_op)) | |
6625 | return false; | |
6626 | ||
6627 | if ((sqe_flags & ctx->restrictions.sqe_flags_required) != | |
6628 | ctx->restrictions.sqe_flags_required) | |
6629 | return false; | |
6630 | ||
6631 | if (sqe_flags & ~(ctx->restrictions.sqe_flags_allowed | | |
6632 | ctx->restrictions.sqe_flags_required)) | |
6633 | return false; | |
6634 | ||
6635 | return true; | |
6636 | } | |
6637 | ||
ef4ff581 PB |
6638 | #define SQE_VALID_FLAGS (IOSQE_FIXED_FILE|IOSQE_IO_DRAIN|IOSQE_IO_LINK| \ |
6639 | IOSQE_IO_HARDLINK | IOSQE_ASYNC | \ | |
6640 | IOSQE_BUFFER_SELECT) | |
6641 | ||
6642 | static int io_init_req(struct io_ring_ctx *ctx, struct io_kiocb *req, | |
6643 | const struct io_uring_sqe *sqe, | |
0cdaf760 | 6644 | struct io_submit_state *state) |
0553b8bd | 6645 | { |
ef4ff581 | 6646 | unsigned int sqe_flags; |
71b547c0 | 6647 | int id, ret; |
ef4ff581 | 6648 | |
0553b8bd PB |
6649 | req->opcode = READ_ONCE(sqe->opcode); |
6650 | req->user_data = READ_ONCE(sqe->user_data); | |
e8c2bc1f | 6651 | req->async_data = NULL; |
0553b8bd PB |
6652 | req->file = NULL; |
6653 | req->ctx = ctx; | |
6654 | req->flags = 0; | |
6655 | /* one is dropped after submission, the other at completion */ | |
6656 | refcount_set(&req->refs, 2); | |
4dd2824d | 6657 | req->task = current; |
0553b8bd | 6658 | req->result = 0; |
ef4ff581 PB |
6659 | |
6660 | if (unlikely(req->opcode >= IORING_OP_LAST)) | |
6661 | return -EINVAL; | |
6662 | ||
28cea78a | 6663 | if (unlikely(io_sq_thread_acquire_mm_files(ctx, req))) |
9d8426a0 | 6664 | return -EFAULT; |
ef4ff581 PB |
6665 | |
6666 | sqe_flags = READ_ONCE(sqe->flags); | |
6667 | /* enforce forwards compatibility on users */ | |
6668 | if (unlikely(sqe_flags & ~SQE_VALID_FLAGS)) | |
6669 | return -EINVAL; | |
6670 | ||
21b55dbc SG |
6671 | if (unlikely(!io_check_restriction(ctx, req, sqe_flags))) |
6672 | return -EACCES; | |
6673 | ||
ef4ff581 PB |
6674 | if ((sqe_flags & IOSQE_BUFFER_SELECT) && |
6675 | !io_op_defs[req->opcode].buffer_select) | |
6676 | return -EOPNOTSUPP; | |
6677 | ||
6678 | id = READ_ONCE(sqe->personality); | |
6679 | if (id) { | |
1e6fa521 JA |
6680 | struct io_identity *iod; |
6681 | ||
1e6fa521 JA |
6682 | iod = idr_find(&ctx->personality_idr, id); |
6683 | if (unlikely(!iod)) | |
ef4ff581 | 6684 | return -EINVAL; |
1e6fa521 | 6685 | refcount_inc(&iod->count); |
ec99ca6c PB |
6686 | |
6687 | __io_req_init_async(req); | |
1e6fa521 JA |
6688 | get_cred(iod->creds); |
6689 | req->work.identity = iod; | |
dfead8a8 | 6690 | req->work.flags |= IO_WQ_WORK_CREDS; |
ef4ff581 PB |
6691 | } |
6692 | ||
6693 | /* same numerical values with corresponding REQ_F_*, safe to copy */ | |
c11368a5 | 6694 | req->flags |= sqe_flags; |
ef4ff581 | 6695 | |
63ff8223 JA |
6696 | if (!io_op_defs[req->opcode].needs_file) |
6697 | return 0; | |
6698 | ||
71b547c0 PB |
6699 | ret = io_req_set_file(state, req, READ_ONCE(sqe->fd)); |
6700 | state->ios_left--; | |
6701 | return ret; | |
0553b8bd PB |
6702 | } |
6703 | ||
0f212204 | 6704 | static int io_submit_sqes(struct io_ring_ctx *ctx, unsigned int nr) |
6c271ce2 | 6705 | { |
ac8691c4 | 6706 | struct io_submit_state state; |
9e645e11 | 6707 | struct io_kiocb *link = NULL; |
9e645e11 | 6708 | int i, submitted = 0; |
6c271ce2 | 6709 | |
c4a2ed72 | 6710 | /* if we have a backlog and couldn't flush it all, return BUSY */ |
ad3eb2c8 JA |
6711 | if (test_bit(0, &ctx->sq_check_overflow)) { |
6712 | if (!list_empty(&ctx->cq_overflow_list) && | |
e6c8aa9a | 6713 | !io_cqring_overflow_flush(ctx, false, NULL, NULL)) |
ad3eb2c8 JA |
6714 | return -EBUSY; |
6715 | } | |
6c271ce2 | 6716 | |
ee7d46d9 PB |
6717 | /* make sure SQ entry isn't read before tail */ |
6718 | nr = min3(nr, ctx->sq_entries, io_sqring_entries(ctx)); | |
9ef4f124 | 6719 | |
2b85edfc PB |
6720 | if (!percpu_ref_tryget_many(&ctx->refs, nr)) |
6721 | return -EAGAIN; | |
6c271ce2 | 6722 | |
d8a6df10 | 6723 | percpu_counter_add(¤t->io_uring->inflight, nr); |
faf7b51c | 6724 | refcount_add(nr, ¤t->usage); |
6c271ce2 | 6725 | |
013538bd | 6726 | io_submit_state_start(&state, ctx, nr); |
b14cca0c | 6727 | |
6c271ce2 | 6728 | for (i = 0; i < nr; i++) { |
3529d8c2 | 6729 | const struct io_uring_sqe *sqe; |
196be95c | 6730 | struct io_kiocb *req; |
1cb1edb2 | 6731 | int err; |
fb5ccc98 | 6732 | |
b1e50e54 PB |
6733 | sqe = io_get_sqe(ctx); |
6734 | if (unlikely(!sqe)) { | |
6735 | io_consume_sqe(ctx); | |
6736 | break; | |
6737 | } | |
ac8691c4 | 6738 | req = io_alloc_req(ctx, &state); |
196be95c PB |
6739 | if (unlikely(!req)) { |
6740 | if (!submitted) | |
6741 | submitted = -EAGAIN; | |
fb5ccc98 | 6742 | break; |
196be95c | 6743 | } |
709b302f | 6744 | io_consume_sqe(ctx); |
d3656344 JA |
6745 | /* will complete beyond this point, count as submitted */ |
6746 | submitted++; | |
6747 | ||
692d8363 | 6748 | err = io_init_req(ctx, req, sqe, &state); |
ef4ff581 | 6749 | if (unlikely(err)) { |
1cb1edb2 | 6750 | fail_req: |
e1e16097 JA |
6751 | io_put_req(req); |
6752 | io_req_complete(req, err); | |
196be95c PB |
6753 | break; |
6754 | } | |
fb5ccc98 | 6755 | |
354420f7 | 6756 | trace_io_uring_submit_sqe(ctx, req->opcode, req->user_data, |
0cdaf760 | 6757 | true, io_async_submit(ctx)); |
f13fad7b | 6758 | err = io_submit_sqe(req, sqe, &link, &state.comp); |
1d4240cc PB |
6759 | if (err) |
6760 | goto fail_req; | |
6c271ce2 JA |
6761 | } |
6762 | ||
9466f437 PB |
6763 | if (unlikely(submitted != nr)) { |
6764 | int ref_used = (submitted == -EAGAIN) ? 0 : submitted; | |
d8a6df10 JA |
6765 | struct io_uring_task *tctx = current->io_uring; |
6766 | int unused = nr - ref_used; | |
9466f437 | 6767 | |
d8a6df10 JA |
6768 | percpu_ref_put_many(&ctx->refs, unused); |
6769 | percpu_counter_sub(&tctx->inflight, unused); | |
6770 | put_task_struct_many(current, unused); | |
9466f437 | 6771 | } |
9e645e11 | 6772 | if (link) |
f13fad7b | 6773 | io_queue_link_head(link, &state.comp); |
ac8691c4 | 6774 | io_submit_state_end(&state); |
6c271ce2 | 6775 | |
ae9428ca PB |
6776 | /* Commit SQ ring head once we've consumed and submitted all SQEs */ |
6777 | io_commit_sqring(ctx); | |
6778 | ||
6c271ce2 JA |
6779 | return submitted; |
6780 | } | |
6781 | ||
23b3628e XW |
6782 | static inline void io_ring_set_wakeup_flag(struct io_ring_ctx *ctx) |
6783 | { | |
6784 | /* Tell userspace we may need a wakeup call */ | |
6785 | spin_lock_irq(&ctx->completion_lock); | |
6786 | ctx->rings->sq_flags |= IORING_SQ_NEED_WAKEUP; | |
6787 | spin_unlock_irq(&ctx->completion_lock); | |
6788 | } | |
6789 | ||
6790 | static inline void io_ring_clear_wakeup_flag(struct io_ring_ctx *ctx) | |
6791 | { | |
6792 | spin_lock_irq(&ctx->completion_lock); | |
6793 | ctx->rings->sq_flags &= ~IORING_SQ_NEED_WAKEUP; | |
6794 | spin_unlock_irq(&ctx->completion_lock); | |
6795 | } | |
6796 | ||
3f0e64d0 JA |
6797 | static int io_sq_wake_function(struct wait_queue_entry *wqe, unsigned mode, |
6798 | int sync, void *key) | |
6c271ce2 | 6799 | { |
3f0e64d0 JA |
6800 | struct io_ring_ctx *ctx = container_of(wqe, struct io_ring_ctx, sqo_wait_entry); |
6801 | int ret; | |
6802 | ||
6803 | ret = autoremove_wake_function(wqe, mode, sync, key); | |
6804 | if (ret) { | |
6805 | unsigned long flags; | |
6806 | ||
6807 | spin_lock_irqsave(&ctx->completion_lock, flags); | |
6808 | ctx->rings->sq_flags &= ~IORING_SQ_NEED_WAKEUP; | |
6809 | spin_unlock_irqrestore(&ctx->completion_lock, flags); | |
6810 | } | |
6811 | return ret; | |
6812 | } | |
6813 | ||
c8d1ba58 JA |
6814 | enum sq_ret { |
6815 | SQT_IDLE = 1, | |
6816 | SQT_SPIN = 2, | |
6817 | SQT_DID_WORK = 4, | |
6818 | }; | |
6819 | ||
6820 | static enum sq_ret __io_sq_thread(struct io_ring_ctx *ctx, | |
e95eee2d | 6821 | unsigned long start_jiffies, bool cap_entries) |
6c271ce2 | 6822 | { |
c8d1ba58 | 6823 | unsigned long timeout = start_jiffies + ctx->sq_thread_idle; |
534ca6d6 | 6824 | struct io_sq_data *sqd = ctx->sq_data; |
c8d1ba58 | 6825 | unsigned int to_submit; |
bdcd3eab | 6826 | int ret = 0; |
6c271ce2 | 6827 | |
c8d1ba58 JA |
6828 | again: |
6829 | if (!list_empty(&ctx->iopoll_list)) { | |
6830 | unsigned nr_events = 0; | |
a4c0b3de | 6831 | |
c8d1ba58 JA |
6832 | mutex_lock(&ctx->uring_lock); |
6833 | if (!list_empty(&ctx->iopoll_list) && !need_resched()) | |
6834 | io_do_iopoll(ctx, &nr_events, 0); | |
6835 | mutex_unlock(&ctx->uring_lock); | |
6836 | } | |
6c271ce2 | 6837 | |
c8d1ba58 | 6838 | to_submit = io_sqring_entries(ctx); |
6c271ce2 | 6839 | |
c8d1ba58 JA |
6840 | /* |
6841 | * If submit got -EBUSY, flag us as needing the application | |
6842 | * to enter the kernel to reap and flush events. | |
6843 | */ | |
6844 | if (!to_submit || ret == -EBUSY || need_resched()) { | |
6845 | /* | |
6846 | * Drop cur_mm before scheduling, we can't hold it for | |
6847 | * long periods (or over schedule()). Do this before | |
6848 | * adding ourselves to the waitqueue, as the unuse/drop | |
6849 | * may sleep. | |
6850 | */ | |
28cea78a | 6851 | io_sq_thread_drop_mm_files(); |
6c271ce2 | 6852 | |
c8d1ba58 JA |
6853 | /* |
6854 | * We're polling. If we're within the defined idle | |
6855 | * period, then let us spin without work before going | |
6856 | * to sleep. The exception is if we got EBUSY doing | |
6857 | * more IO, we should wait for the application to | |
6858 | * reap events and wake us up. | |
6859 | */ | |
6860 | if (!list_empty(&ctx->iopoll_list) || need_resched() || | |
6861 | (!time_after(jiffies, timeout) && ret != -EBUSY && | |
6862 | !percpu_ref_is_dying(&ctx->refs))) | |
6863 | return SQT_SPIN; | |
6c271ce2 | 6864 | |
534ca6d6 | 6865 | prepare_to_wait(&sqd->wait, &ctx->sqo_wait_entry, |
c8d1ba58 | 6866 | TASK_INTERRUPTIBLE); |
6c271ce2 | 6867 | |
c8d1ba58 JA |
6868 | /* |
6869 | * While doing polled IO, before going to sleep, we need | |
6870 | * to check if there are new reqs added to iopoll_list, | |
6871 | * it is because reqs may have been punted to io worker | |
6872 | * and will be added to iopoll_list later, hence check | |
6873 | * the iopoll_list again. | |
6874 | */ | |
6875 | if ((ctx->flags & IORING_SETUP_IOPOLL) && | |
6876 | !list_empty_careful(&ctx->iopoll_list)) { | |
534ca6d6 | 6877 | finish_wait(&sqd->wait, &ctx->sqo_wait_entry); |
c8d1ba58 | 6878 | goto again; |
6c271ce2 JA |
6879 | } |
6880 | ||
fb5ccc98 | 6881 | to_submit = io_sqring_entries(ctx); |
c8d1ba58 JA |
6882 | if (!to_submit || ret == -EBUSY) |
6883 | return SQT_IDLE; | |
6884 | } | |
c1edbf5f | 6885 | |
534ca6d6 | 6886 | finish_wait(&sqd->wait, &ctx->sqo_wait_entry); |
c8d1ba58 | 6887 | io_ring_clear_wakeup_flag(ctx); |
7143b5ac | 6888 | |
e95eee2d JA |
6889 | /* if we're handling multiple rings, cap submit size for fairness */ |
6890 | if (cap_entries && to_submit > 8) | |
6891 | to_submit = 8; | |
6892 | ||
c8d1ba58 JA |
6893 | mutex_lock(&ctx->uring_lock); |
6894 | if (likely(!percpu_ref_is_dying(&ctx->refs))) | |
6895 | ret = io_submit_sqes(ctx, to_submit); | |
6896 | mutex_unlock(&ctx->uring_lock); | |
90554200 JA |
6897 | |
6898 | if (!io_sqring_full(ctx) && wq_has_sleeper(&ctx->sqo_sq_wait)) | |
6899 | wake_up(&ctx->sqo_sq_wait); | |
6900 | ||
c8d1ba58 JA |
6901 | return SQT_DID_WORK; |
6902 | } | |
6c271ce2 | 6903 | |
69fb2131 JA |
6904 | static void io_sqd_init_new(struct io_sq_data *sqd) |
6905 | { | |
6906 | struct io_ring_ctx *ctx; | |
6907 | ||
6908 | while (!list_empty(&sqd->ctx_new_list)) { | |
6909 | ctx = list_first_entry(&sqd->ctx_new_list, struct io_ring_ctx, sqd_list); | |
6910 | init_wait(&ctx->sqo_wait_entry); | |
6911 | ctx->sqo_wait_entry.func = io_sq_wake_function; | |
6912 | list_move_tail(&ctx->sqd_list, &sqd->ctx_list); | |
6913 | complete(&ctx->sq_thread_comp); | |
6914 | } | |
6915 | } | |
6916 | ||
c8d1ba58 JA |
6917 | static int io_sq_thread(void *data) |
6918 | { | |
91d8f519 | 6919 | struct cgroup_subsys_state *cur_css = NULL; |
28cea78a JA |
6920 | struct files_struct *old_files = current->files; |
6921 | struct nsproxy *old_nsproxy = current->nsproxy; | |
69fb2131 JA |
6922 | const struct cred *old_cred = NULL; |
6923 | struct io_sq_data *sqd = data; | |
6924 | struct io_ring_ctx *ctx; | |
c8d1ba58 | 6925 | unsigned long start_jiffies; |
6c271ce2 | 6926 | |
28cea78a JA |
6927 | task_lock(current); |
6928 | current->files = NULL; | |
6929 | current->nsproxy = NULL; | |
6930 | task_unlock(current); | |
6931 | ||
69fb2131 JA |
6932 | start_jiffies = jiffies; |
6933 | while (!kthread_should_stop()) { | |
6934 | enum sq_ret ret = 0; | |
e95eee2d | 6935 | bool cap_entries; |
c1edbf5f JA |
6936 | |
6937 | /* | |
69fb2131 JA |
6938 | * Any changes to the sqd lists are synchronized through the |
6939 | * kthread parking. This synchronizes the thread vs users, | |
6940 | * the users are synchronized on the sqd->ctx_lock. | |
c1edbf5f | 6941 | */ |
69fb2131 JA |
6942 | if (kthread_should_park()) |
6943 | kthread_parkme(); | |
7143b5ac | 6944 | |
69fb2131 JA |
6945 | if (unlikely(!list_empty(&sqd->ctx_new_list))) |
6946 | io_sqd_init_new(sqd); | |
6c271ce2 | 6947 | |
e95eee2d | 6948 | cap_entries = !list_is_singular(&sqd->ctx_list); |
6c271ce2 | 6949 | |
69fb2131 JA |
6950 | list_for_each_entry(ctx, &sqd->ctx_list, sqd_list) { |
6951 | if (current->cred != ctx->creds) { | |
6952 | if (old_cred) | |
6953 | revert_creds(old_cred); | |
6954 | old_cred = override_creds(ctx->creds); | |
bdcd3eab | 6955 | } |
91d8f519 | 6956 | io_sq_thread_associate_blkcg(ctx, &cur_css); |
4ea33a97 JA |
6957 | #ifdef CONFIG_AUDIT |
6958 | current->loginuid = ctx->loginuid; | |
6959 | current->sessionid = ctx->sessionid; | |
6960 | #endif | |
bdcd3eab | 6961 | |
e95eee2d | 6962 | ret |= __io_sq_thread(ctx, start_jiffies, cap_entries); |
6c271ce2 | 6963 | |
28cea78a | 6964 | io_sq_thread_drop_mm_files(); |
69fb2131 | 6965 | } |
6c271ce2 | 6966 | |
69fb2131 | 6967 | if (ret & SQT_SPIN) { |
c8d1ba58 JA |
6968 | io_run_task_work(); |
6969 | cond_resched(); | |
69fb2131 JA |
6970 | } else if (ret == SQT_IDLE) { |
6971 | if (kthread_should_park()) | |
6c271ce2 | 6972 | continue; |
69fb2131 JA |
6973 | list_for_each_entry(ctx, &sqd->ctx_list, sqd_list) |
6974 | io_ring_set_wakeup_flag(ctx); | |
6975 | schedule(); | |
6976 | start_jiffies = jiffies; | |
6977 | list_for_each_entry(ctx, &sqd->ctx_list, sqd_list) | |
6978 | io_ring_clear_wakeup_flag(ctx); | |
6c271ce2 | 6979 | } |
6c271ce2 JA |
6980 | } |
6981 | ||
4c6e277c | 6982 | io_run_task_work(); |
b41e9852 | 6983 | |
91d8f519 DZ |
6984 | if (cur_css) |
6985 | io_sq_thread_unassociate_blkcg(); | |
69fb2131 JA |
6986 | if (old_cred) |
6987 | revert_creds(old_cred); | |
06058632 | 6988 | |
28cea78a JA |
6989 | task_lock(current); |
6990 | current->files = old_files; | |
6991 | current->nsproxy = old_nsproxy; | |
6992 | task_unlock(current); | |
6993 | ||
2bbcd6d3 | 6994 | kthread_parkme(); |
06058632 | 6995 | |
6c271ce2 JA |
6996 | return 0; |
6997 | } | |
6998 | ||
bda52162 JA |
6999 | struct io_wait_queue { |
7000 | struct wait_queue_entry wq; | |
7001 | struct io_ring_ctx *ctx; | |
7002 | unsigned to_wait; | |
7003 | unsigned nr_timeouts; | |
7004 | }; | |
7005 | ||
1d7bb1d5 | 7006 | static inline bool io_should_wake(struct io_wait_queue *iowq, bool noflush) |
bda52162 JA |
7007 | { |
7008 | struct io_ring_ctx *ctx = iowq->ctx; | |
7009 | ||
7010 | /* | |
d195a66e | 7011 | * Wake up if we have enough events, or if a timeout occurred since we |
bda52162 JA |
7012 | * started waiting. For timeouts, we always want to return to userspace, |
7013 | * regardless of event count. | |
7014 | */ | |
1d7bb1d5 | 7015 | return io_cqring_events(ctx, noflush) >= iowq->to_wait || |
bda52162 JA |
7016 | atomic_read(&ctx->cq_timeouts) != iowq->nr_timeouts; |
7017 | } | |
7018 | ||
7019 | static int io_wake_function(struct wait_queue_entry *curr, unsigned int mode, | |
7020 | int wake_flags, void *key) | |
7021 | { | |
7022 | struct io_wait_queue *iowq = container_of(curr, struct io_wait_queue, | |
7023 | wq); | |
7024 | ||
1d7bb1d5 JA |
7025 | /* use noflush == true, as we can't safely rely on locking context */ |
7026 | if (!io_should_wake(iowq, true)) | |
bda52162 JA |
7027 | return -1; |
7028 | ||
7029 | return autoremove_wake_function(curr, mode, wake_flags, key); | |
7030 | } | |
7031 | ||
af9c1a44 JA |
7032 | static int io_run_task_work_sig(void) |
7033 | { | |
7034 | if (io_run_task_work()) | |
7035 | return 1; | |
7036 | if (!signal_pending(current)) | |
7037 | return 0; | |
7038 | if (current->jobctl & JOBCTL_TASK_WORK) { | |
7039 | spin_lock_irq(¤t->sighand->siglock); | |
7040 | current->jobctl &= ~JOBCTL_TASK_WORK; | |
7041 | recalc_sigpending(); | |
7042 | spin_unlock_irq(¤t->sighand->siglock); | |
7043 | return 1; | |
7044 | } | |
7045 | return -EINTR; | |
7046 | } | |
7047 | ||
2b188cc1 JA |
7048 | /* |
7049 | * Wait until events become available, if we don't already have some. The | |
7050 | * application must reap them itself, as they reside on the shared cq ring. | |
7051 | */ | |
7052 | static int io_cqring_wait(struct io_ring_ctx *ctx, int min_events, | |
7053 | const sigset_t __user *sig, size_t sigsz) | |
7054 | { | |
bda52162 JA |
7055 | struct io_wait_queue iowq = { |
7056 | .wq = { | |
7057 | .private = current, | |
7058 | .func = io_wake_function, | |
7059 | .entry = LIST_HEAD_INIT(iowq.wq.entry), | |
7060 | }, | |
7061 | .ctx = ctx, | |
7062 | .to_wait = min_events, | |
7063 | }; | |
75b28aff | 7064 | struct io_rings *rings = ctx->rings; |
e9ffa5c2 | 7065 | int ret = 0; |
2b188cc1 | 7066 | |
b41e9852 JA |
7067 | do { |
7068 | if (io_cqring_events(ctx, false) >= min_events) | |
7069 | return 0; | |
4c6e277c | 7070 | if (!io_run_task_work()) |
b41e9852 | 7071 | break; |
b41e9852 | 7072 | } while (1); |
2b188cc1 JA |
7073 | |
7074 | if (sig) { | |
9e75ad5d AB |
7075 | #ifdef CONFIG_COMPAT |
7076 | if (in_compat_syscall()) | |
7077 | ret = set_compat_user_sigmask((const compat_sigset_t __user *)sig, | |
b772434b | 7078 | sigsz); |
9e75ad5d AB |
7079 | else |
7080 | #endif | |
b772434b | 7081 | ret = set_user_sigmask(sig, sigsz); |
9e75ad5d | 7082 | |
2b188cc1 JA |
7083 | if (ret) |
7084 | return ret; | |
7085 | } | |
7086 | ||
bda52162 | 7087 | iowq.nr_timeouts = atomic_read(&ctx->cq_timeouts); |
c826bd7a | 7088 | trace_io_uring_cqring_wait(ctx, min_events); |
bda52162 JA |
7089 | do { |
7090 | prepare_to_wait_exclusive(&ctx->wait, &iowq.wq, | |
7091 | TASK_INTERRUPTIBLE); | |
ce593a6c | 7092 | /* make sure we run task_work before checking for signals */ |
af9c1a44 JA |
7093 | ret = io_run_task_work_sig(); |
7094 | if (ret > 0) | |
4c6e277c | 7095 | continue; |
af9c1a44 | 7096 | else if (ret < 0) |
bda52162 | 7097 | break; |
ce593a6c JA |
7098 | if (io_should_wake(&iowq, false)) |
7099 | break; | |
7100 | schedule(); | |
bda52162 JA |
7101 | } while (1); |
7102 | finish_wait(&ctx->wait, &iowq.wq); | |
7103 | ||
b7db41c9 | 7104 | restore_saved_sigmask_unless(ret == -EINTR); |
2b188cc1 | 7105 | |
75b28aff | 7106 | return READ_ONCE(rings->cq.head) == READ_ONCE(rings->cq.tail) ? ret : 0; |
2b188cc1 JA |
7107 | } |
7108 | ||
6b06314c JA |
7109 | static void __io_sqe_files_unregister(struct io_ring_ctx *ctx) |
7110 | { | |
7111 | #if defined(CONFIG_UNIX) | |
7112 | if (ctx->ring_sock) { | |
7113 | struct sock *sock = ctx->ring_sock->sk; | |
7114 | struct sk_buff *skb; | |
7115 | ||
7116 | while ((skb = skb_dequeue(&sock->sk_receive_queue)) != NULL) | |
7117 | kfree_skb(skb); | |
7118 | } | |
7119 | #else | |
7120 | int i; | |
7121 | ||
65e19f54 JA |
7122 | for (i = 0; i < ctx->nr_user_files; i++) { |
7123 | struct file *file; | |
7124 | ||
7125 | file = io_file_from_index(ctx, i); | |
7126 | if (file) | |
7127 | fput(file); | |
7128 | } | |
6b06314c JA |
7129 | #endif |
7130 | } | |
7131 | ||
05f3fb3c JA |
7132 | static void io_file_ref_kill(struct percpu_ref *ref) |
7133 | { | |
7134 | struct fixed_file_data *data; | |
7135 | ||
7136 | data = container_of(ref, struct fixed_file_data, refs); | |
7137 | complete(&data->done); | |
7138 | } | |
7139 | ||
6b06314c JA |
7140 | static int io_sqe_files_unregister(struct io_ring_ctx *ctx) |
7141 | { | |
05f3fb3c | 7142 | struct fixed_file_data *data = ctx->file_data; |
05589553 | 7143 | struct fixed_file_ref_node *ref_node = NULL; |
65e19f54 JA |
7144 | unsigned nr_tables, i; |
7145 | ||
05f3fb3c | 7146 | if (!data) |
6b06314c JA |
7147 | return -ENXIO; |
7148 | ||
6a4d07cd | 7149 | spin_lock(&data->lock); |
1e5d770b | 7150 | ref_node = data->node; |
6a4d07cd | 7151 | spin_unlock(&data->lock); |
05589553 XW |
7152 | if (ref_node) |
7153 | percpu_ref_kill(&ref_node->refs); | |
7154 | ||
7155 | percpu_ref_kill(&data->refs); | |
7156 | ||
7157 | /* wait for all refs nodes to complete */ | |
4a38aed2 | 7158 | flush_delayed_work(&ctx->file_put_work); |
2faf852d | 7159 | wait_for_completion(&data->done); |
05f3fb3c | 7160 | |
6b06314c | 7161 | __io_sqe_files_unregister(ctx); |
65e19f54 JA |
7162 | nr_tables = DIV_ROUND_UP(ctx->nr_user_files, IORING_MAX_FILES_TABLE); |
7163 | for (i = 0; i < nr_tables; i++) | |
05f3fb3c JA |
7164 | kfree(data->table[i].files); |
7165 | kfree(data->table); | |
05589553 XW |
7166 | percpu_ref_exit(&data->refs); |
7167 | kfree(data); | |
05f3fb3c | 7168 | ctx->file_data = NULL; |
6b06314c JA |
7169 | ctx->nr_user_files = 0; |
7170 | return 0; | |
7171 | } | |
7172 | ||
534ca6d6 | 7173 | static void io_put_sq_data(struct io_sq_data *sqd) |
6c271ce2 | 7174 | { |
534ca6d6 | 7175 | if (refcount_dec_and_test(&sqd->refs)) { |
2bbcd6d3 RP |
7176 | /* |
7177 | * The park is a bit of a work-around, without it we get | |
7178 | * warning spews on shutdown with SQPOLL set and affinity | |
7179 | * set to a single CPU. | |
7180 | */ | |
534ca6d6 JA |
7181 | if (sqd->thread) { |
7182 | kthread_park(sqd->thread); | |
7183 | kthread_stop(sqd->thread); | |
7184 | } | |
7185 | ||
7186 | kfree(sqd); | |
7187 | } | |
7188 | } | |
7189 | ||
aa06165d JA |
7190 | static struct io_sq_data *io_attach_sq_data(struct io_uring_params *p) |
7191 | { | |
7192 | struct io_ring_ctx *ctx_attach; | |
7193 | struct io_sq_data *sqd; | |
7194 | struct fd f; | |
7195 | ||
7196 | f = fdget(p->wq_fd); | |
7197 | if (!f.file) | |
7198 | return ERR_PTR(-ENXIO); | |
7199 | if (f.file->f_op != &io_uring_fops) { | |
7200 | fdput(f); | |
7201 | return ERR_PTR(-EINVAL); | |
7202 | } | |
7203 | ||
7204 | ctx_attach = f.file->private_data; | |
7205 | sqd = ctx_attach->sq_data; | |
7206 | if (!sqd) { | |
7207 | fdput(f); | |
7208 | return ERR_PTR(-EINVAL); | |
7209 | } | |
7210 | ||
7211 | refcount_inc(&sqd->refs); | |
7212 | fdput(f); | |
7213 | return sqd; | |
7214 | } | |
7215 | ||
534ca6d6 JA |
7216 | static struct io_sq_data *io_get_sq_data(struct io_uring_params *p) |
7217 | { | |
7218 | struct io_sq_data *sqd; | |
7219 | ||
aa06165d JA |
7220 | if (p->flags & IORING_SETUP_ATTACH_WQ) |
7221 | return io_attach_sq_data(p); | |
7222 | ||
534ca6d6 JA |
7223 | sqd = kzalloc(sizeof(*sqd), GFP_KERNEL); |
7224 | if (!sqd) | |
7225 | return ERR_PTR(-ENOMEM); | |
7226 | ||
7227 | refcount_set(&sqd->refs, 1); | |
69fb2131 JA |
7228 | INIT_LIST_HEAD(&sqd->ctx_list); |
7229 | INIT_LIST_HEAD(&sqd->ctx_new_list); | |
7230 | mutex_init(&sqd->ctx_lock); | |
7231 | mutex_init(&sqd->lock); | |
534ca6d6 JA |
7232 | init_waitqueue_head(&sqd->wait); |
7233 | return sqd; | |
7234 | } | |
7235 | ||
69fb2131 JA |
7236 | static void io_sq_thread_unpark(struct io_sq_data *sqd) |
7237 | __releases(&sqd->lock) | |
7238 | { | |
7239 | if (!sqd->thread) | |
7240 | return; | |
7241 | kthread_unpark(sqd->thread); | |
7242 | mutex_unlock(&sqd->lock); | |
7243 | } | |
7244 | ||
7245 | static void io_sq_thread_park(struct io_sq_data *sqd) | |
7246 | __acquires(&sqd->lock) | |
7247 | { | |
7248 | if (!sqd->thread) | |
7249 | return; | |
7250 | mutex_lock(&sqd->lock); | |
7251 | kthread_park(sqd->thread); | |
7252 | } | |
7253 | ||
534ca6d6 JA |
7254 | static void io_sq_thread_stop(struct io_ring_ctx *ctx) |
7255 | { | |
7256 | struct io_sq_data *sqd = ctx->sq_data; | |
7257 | ||
7258 | if (sqd) { | |
7259 | if (sqd->thread) { | |
7260 | /* | |
7261 | * We may arrive here from the error branch in | |
7262 | * io_sq_offload_create() where the kthread is created | |
7263 | * without being waked up, thus wake it up now to make | |
7264 | * sure the wait will complete. | |
7265 | */ | |
7266 | wake_up_process(sqd->thread); | |
7267 | wait_for_completion(&ctx->sq_thread_comp); | |
69fb2131 JA |
7268 | |
7269 | io_sq_thread_park(sqd); | |
7270 | } | |
7271 | ||
7272 | mutex_lock(&sqd->ctx_lock); | |
7273 | list_del(&ctx->sqd_list); | |
7274 | mutex_unlock(&sqd->ctx_lock); | |
7275 | ||
7276 | if (sqd->thread) { | |
7277 | finish_wait(&sqd->wait, &ctx->sqo_wait_entry); | |
7278 | io_sq_thread_unpark(sqd); | |
534ca6d6 JA |
7279 | } |
7280 | ||
7281 | io_put_sq_data(sqd); | |
7282 | ctx->sq_data = NULL; | |
6c271ce2 JA |
7283 | } |
7284 | } | |
7285 | ||
6b06314c JA |
7286 | static void io_finish_async(struct io_ring_ctx *ctx) |
7287 | { | |
6c271ce2 JA |
7288 | io_sq_thread_stop(ctx); |
7289 | ||
561fb04a JA |
7290 | if (ctx->io_wq) { |
7291 | io_wq_destroy(ctx->io_wq); | |
7292 | ctx->io_wq = NULL; | |
6b06314c JA |
7293 | } |
7294 | } | |
7295 | ||
7296 | #if defined(CONFIG_UNIX) | |
6b06314c JA |
7297 | /* |
7298 | * Ensure the UNIX gc is aware of our file set, so we are certain that | |
7299 | * the io_uring can be safely unregistered on process exit, even if we have | |
7300 | * loops in the file referencing. | |
7301 | */ | |
7302 | static int __io_sqe_files_scm(struct io_ring_ctx *ctx, int nr, int offset) | |
7303 | { | |
7304 | struct sock *sk = ctx->ring_sock->sk; | |
7305 | struct scm_fp_list *fpl; | |
7306 | struct sk_buff *skb; | |
08a45173 | 7307 | int i, nr_files; |
6b06314c | 7308 | |
6b06314c JA |
7309 | fpl = kzalloc(sizeof(*fpl), GFP_KERNEL); |
7310 | if (!fpl) | |
7311 | return -ENOMEM; | |
7312 | ||
7313 | skb = alloc_skb(0, GFP_KERNEL); | |
7314 | if (!skb) { | |
7315 | kfree(fpl); | |
7316 | return -ENOMEM; | |
7317 | } | |
7318 | ||
7319 | skb->sk = sk; | |
6b06314c | 7320 | |
08a45173 | 7321 | nr_files = 0; |
6b06314c JA |
7322 | fpl->user = get_uid(ctx->user); |
7323 | for (i = 0; i < nr; i++) { | |
65e19f54 JA |
7324 | struct file *file = io_file_from_index(ctx, i + offset); |
7325 | ||
7326 | if (!file) | |
08a45173 | 7327 | continue; |
65e19f54 | 7328 | fpl->fp[nr_files] = get_file(file); |
08a45173 JA |
7329 | unix_inflight(fpl->user, fpl->fp[nr_files]); |
7330 | nr_files++; | |
6b06314c JA |
7331 | } |
7332 | ||
08a45173 JA |
7333 | if (nr_files) { |
7334 | fpl->max = SCM_MAX_FD; | |
7335 | fpl->count = nr_files; | |
7336 | UNIXCB(skb).fp = fpl; | |
05f3fb3c | 7337 | skb->destructor = unix_destruct_scm; |
08a45173 JA |
7338 | refcount_add(skb->truesize, &sk->sk_wmem_alloc); |
7339 | skb_queue_head(&sk->sk_receive_queue, skb); | |
6b06314c | 7340 | |
08a45173 JA |
7341 | for (i = 0; i < nr_files; i++) |
7342 | fput(fpl->fp[i]); | |
7343 | } else { | |
7344 | kfree_skb(skb); | |
7345 | kfree(fpl); | |
7346 | } | |
6b06314c JA |
7347 | |
7348 | return 0; | |
7349 | } | |
7350 | ||
7351 | /* | |
7352 | * If UNIX sockets are enabled, fd passing can cause a reference cycle which | |
7353 | * causes regular reference counting to break down. We rely on the UNIX | |
7354 | * garbage collection to take care of this problem for us. | |
7355 | */ | |
7356 | static int io_sqe_files_scm(struct io_ring_ctx *ctx) | |
7357 | { | |
7358 | unsigned left, total; | |
7359 | int ret = 0; | |
7360 | ||
7361 | total = 0; | |
7362 | left = ctx->nr_user_files; | |
7363 | while (left) { | |
7364 | unsigned this_files = min_t(unsigned, left, SCM_MAX_FD); | |
6b06314c JA |
7365 | |
7366 | ret = __io_sqe_files_scm(ctx, this_files, total); | |
7367 | if (ret) | |
7368 | break; | |
7369 | left -= this_files; | |
7370 | total += this_files; | |
7371 | } | |
7372 | ||
7373 | if (!ret) | |
7374 | return 0; | |
7375 | ||
7376 | while (total < ctx->nr_user_files) { | |
65e19f54 JA |
7377 | struct file *file = io_file_from_index(ctx, total); |
7378 | ||
7379 | if (file) | |
7380 | fput(file); | |
6b06314c JA |
7381 | total++; |
7382 | } | |
7383 | ||
7384 | return ret; | |
7385 | } | |
7386 | #else | |
7387 | static int io_sqe_files_scm(struct io_ring_ctx *ctx) | |
7388 | { | |
7389 | return 0; | |
7390 | } | |
7391 | #endif | |
7392 | ||
5398ae69 PB |
7393 | static int io_sqe_alloc_file_tables(struct fixed_file_data *file_data, |
7394 | unsigned nr_tables, unsigned nr_files) | |
65e19f54 JA |
7395 | { |
7396 | int i; | |
7397 | ||
7398 | for (i = 0; i < nr_tables; i++) { | |
5398ae69 | 7399 | struct fixed_file_table *table = &file_data->table[i]; |
65e19f54 JA |
7400 | unsigned this_files; |
7401 | ||
7402 | this_files = min(nr_files, IORING_MAX_FILES_TABLE); | |
7403 | table->files = kcalloc(this_files, sizeof(struct file *), | |
7404 | GFP_KERNEL); | |
7405 | if (!table->files) | |
7406 | break; | |
7407 | nr_files -= this_files; | |
7408 | } | |
7409 | ||
7410 | if (i == nr_tables) | |
7411 | return 0; | |
7412 | ||
7413 | for (i = 0; i < nr_tables; i++) { | |
5398ae69 | 7414 | struct fixed_file_table *table = &file_data->table[i]; |
65e19f54 JA |
7415 | kfree(table->files); |
7416 | } | |
7417 | return 1; | |
7418 | } | |
7419 | ||
05f3fb3c JA |
7420 | static void io_ring_file_put(struct io_ring_ctx *ctx, struct file *file) |
7421 | { | |
7422 | #if defined(CONFIG_UNIX) | |
7423 | struct sock *sock = ctx->ring_sock->sk; | |
7424 | struct sk_buff_head list, *head = &sock->sk_receive_queue; | |
7425 | struct sk_buff *skb; | |
7426 | int i; | |
7427 | ||
7428 | __skb_queue_head_init(&list); | |
7429 | ||
7430 | /* | |
7431 | * Find the skb that holds this file in its SCM_RIGHTS. When found, | |
7432 | * remove this entry and rearrange the file array. | |
7433 | */ | |
7434 | skb = skb_dequeue(head); | |
7435 | while (skb) { | |
7436 | struct scm_fp_list *fp; | |
7437 | ||
7438 | fp = UNIXCB(skb).fp; | |
7439 | for (i = 0; i < fp->count; i++) { | |
7440 | int left; | |
7441 | ||
7442 | if (fp->fp[i] != file) | |
7443 | continue; | |
7444 | ||
7445 | unix_notinflight(fp->user, fp->fp[i]); | |
7446 | left = fp->count - 1 - i; | |
7447 | if (left) { | |
7448 | memmove(&fp->fp[i], &fp->fp[i + 1], | |
7449 | left * sizeof(struct file *)); | |
7450 | } | |
7451 | fp->count--; | |
7452 | if (!fp->count) { | |
7453 | kfree_skb(skb); | |
7454 | skb = NULL; | |
7455 | } else { | |
7456 | __skb_queue_tail(&list, skb); | |
7457 | } | |
7458 | fput(file); | |
7459 | file = NULL; | |
7460 | break; | |
7461 | } | |
7462 | ||
7463 | if (!file) | |
7464 | break; | |
7465 | ||
7466 | __skb_queue_tail(&list, skb); | |
7467 | ||
7468 | skb = skb_dequeue(head); | |
7469 | } | |
7470 | ||
7471 | if (skb_peek(&list)) { | |
7472 | spin_lock_irq(&head->lock); | |
7473 | while ((skb = __skb_dequeue(&list)) != NULL) | |
7474 | __skb_queue_tail(head, skb); | |
7475 | spin_unlock_irq(&head->lock); | |
7476 | } | |
7477 | #else | |
7478 | fput(file); | |
7479 | #endif | |
7480 | } | |
7481 | ||
7482 | struct io_file_put { | |
05589553 | 7483 | struct list_head list; |
05f3fb3c | 7484 | struct file *file; |
05f3fb3c JA |
7485 | }; |
7486 | ||
4a38aed2 | 7487 | static void __io_file_put_work(struct fixed_file_ref_node *ref_node) |
65e19f54 | 7488 | { |
4a38aed2 JA |
7489 | struct fixed_file_data *file_data = ref_node->file_data; |
7490 | struct io_ring_ctx *ctx = file_data->ctx; | |
05f3fb3c | 7491 | struct io_file_put *pfile, *tmp; |
05589553 XW |
7492 | |
7493 | list_for_each_entry_safe(pfile, tmp, &ref_node->file_list, list) { | |
6a4d07cd | 7494 | list_del(&pfile->list); |
05589553 XW |
7495 | io_ring_file_put(ctx, pfile->file); |
7496 | kfree(pfile); | |
65e19f54 | 7497 | } |
05589553 | 7498 | |
05589553 XW |
7499 | percpu_ref_exit(&ref_node->refs); |
7500 | kfree(ref_node); | |
7501 | percpu_ref_put(&file_data->refs); | |
2faf852d | 7502 | } |
65e19f54 | 7503 | |
4a38aed2 JA |
7504 | static void io_file_put_work(struct work_struct *work) |
7505 | { | |
7506 | struct io_ring_ctx *ctx; | |
7507 | struct llist_node *node; | |
7508 | ||
7509 | ctx = container_of(work, struct io_ring_ctx, file_put_work.work); | |
7510 | node = llist_del_all(&ctx->file_put_llist); | |
7511 | ||
7512 | while (node) { | |
7513 | struct fixed_file_ref_node *ref_node; | |
7514 | struct llist_node *next = node->next; | |
7515 | ||
7516 | ref_node = llist_entry(node, struct fixed_file_ref_node, llist); | |
7517 | __io_file_put_work(ref_node); | |
7518 | node = next; | |
7519 | } | |
7520 | } | |
7521 | ||
05589553 | 7522 | static void io_file_data_ref_zero(struct percpu_ref *ref) |
2faf852d | 7523 | { |
05589553 | 7524 | struct fixed_file_ref_node *ref_node; |
e297822b | 7525 | struct fixed_file_data *data; |
4a38aed2 | 7526 | struct io_ring_ctx *ctx; |
e297822b | 7527 | bool first_add = false; |
4a38aed2 | 7528 | int delay = HZ; |
65e19f54 | 7529 | |
05589553 | 7530 | ref_node = container_of(ref, struct fixed_file_ref_node, refs); |
e297822b PB |
7531 | data = ref_node->file_data; |
7532 | ctx = data->ctx; | |
7533 | ||
7534 | spin_lock(&data->lock); | |
7535 | ref_node->done = true; | |
7536 | ||
7537 | while (!list_empty(&data->ref_list)) { | |
7538 | ref_node = list_first_entry(&data->ref_list, | |
7539 | struct fixed_file_ref_node, node); | |
7540 | /* recycle ref nodes in order */ | |
7541 | if (!ref_node->done) | |
7542 | break; | |
7543 | list_del(&ref_node->node); | |
7544 | first_add |= llist_add(&ref_node->llist, &ctx->file_put_llist); | |
7545 | } | |
7546 | spin_unlock(&data->lock); | |
05589553 | 7547 | |
e297822b | 7548 | if (percpu_ref_is_dying(&data->refs)) |
4a38aed2 | 7549 | delay = 0; |
05589553 | 7550 | |
4a38aed2 JA |
7551 | if (!delay) |
7552 | mod_delayed_work(system_wq, &ctx->file_put_work, 0); | |
7553 | else if (first_add) | |
7554 | queue_delayed_work(system_wq, &ctx->file_put_work, delay); | |
05f3fb3c | 7555 | } |
65e19f54 | 7556 | |
05589553 XW |
7557 | static struct fixed_file_ref_node *alloc_fixed_file_ref_node( |
7558 | struct io_ring_ctx *ctx) | |
05f3fb3c | 7559 | { |
05589553 | 7560 | struct fixed_file_ref_node *ref_node; |
05f3fb3c | 7561 | |
05589553 XW |
7562 | ref_node = kzalloc(sizeof(*ref_node), GFP_KERNEL); |
7563 | if (!ref_node) | |
7564 | return ERR_PTR(-ENOMEM); | |
05f3fb3c | 7565 | |
05589553 XW |
7566 | if (percpu_ref_init(&ref_node->refs, io_file_data_ref_zero, |
7567 | 0, GFP_KERNEL)) { | |
7568 | kfree(ref_node); | |
7569 | return ERR_PTR(-ENOMEM); | |
7570 | } | |
7571 | INIT_LIST_HEAD(&ref_node->node); | |
7572 | INIT_LIST_HEAD(&ref_node->file_list); | |
05589553 | 7573 | ref_node->file_data = ctx->file_data; |
e297822b | 7574 | ref_node->done = false; |
05589553 | 7575 | return ref_node; |
05589553 XW |
7576 | } |
7577 | ||
7578 | static void destroy_fixed_file_ref_node(struct fixed_file_ref_node *ref_node) | |
7579 | { | |
7580 | percpu_ref_exit(&ref_node->refs); | |
7581 | kfree(ref_node); | |
65e19f54 JA |
7582 | } |
7583 | ||
6b06314c JA |
7584 | static int io_sqe_files_register(struct io_ring_ctx *ctx, void __user *arg, |
7585 | unsigned nr_args) | |
7586 | { | |
7587 | __s32 __user *fds = (__s32 __user *) arg; | |
600cf3f8 | 7588 | unsigned nr_tables, i; |
05f3fb3c | 7589 | struct file *file; |
600cf3f8 | 7590 | int fd, ret = -ENOMEM; |
05589553 | 7591 | struct fixed_file_ref_node *ref_node; |
5398ae69 | 7592 | struct fixed_file_data *file_data; |
6b06314c | 7593 | |
05f3fb3c | 7594 | if (ctx->file_data) |
6b06314c JA |
7595 | return -EBUSY; |
7596 | if (!nr_args) | |
7597 | return -EINVAL; | |
7598 | if (nr_args > IORING_MAX_FIXED_FILES) | |
7599 | return -EMFILE; | |
7600 | ||
5398ae69 PB |
7601 | file_data = kzalloc(sizeof(*ctx->file_data), GFP_KERNEL); |
7602 | if (!file_data) | |
05f3fb3c | 7603 | return -ENOMEM; |
5398ae69 PB |
7604 | file_data->ctx = ctx; |
7605 | init_completion(&file_data->done); | |
7606 | INIT_LIST_HEAD(&file_data->ref_list); | |
7607 | spin_lock_init(&file_data->lock); | |
05f3fb3c | 7608 | |
65e19f54 | 7609 | nr_tables = DIV_ROUND_UP(nr_args, IORING_MAX_FILES_TABLE); |
035fbafc | 7610 | file_data->table = kcalloc(nr_tables, sizeof(*file_data->table), |
5398ae69 | 7611 | GFP_KERNEL); |
600cf3f8 PB |
7612 | if (!file_data->table) |
7613 | goto out_free; | |
05f3fb3c | 7614 | |
5398ae69 | 7615 | if (percpu_ref_init(&file_data->refs, io_file_ref_kill, |
600cf3f8 PB |
7616 | PERCPU_REF_ALLOW_REINIT, GFP_KERNEL)) |
7617 | goto out_free; | |
6b06314c | 7618 | |
600cf3f8 PB |
7619 | if (io_sqe_alloc_file_tables(file_data, nr_tables, nr_args)) |
7620 | goto out_ref; | |
55cbc256 | 7621 | ctx->file_data = file_data; |
65e19f54 | 7622 | |
08a45173 | 7623 | for (i = 0; i < nr_args; i++, ctx->nr_user_files++) { |
65e19f54 JA |
7624 | struct fixed_file_table *table; |
7625 | unsigned index; | |
7626 | ||
600cf3f8 PB |
7627 | if (copy_from_user(&fd, &fds[i], sizeof(fd))) { |
7628 | ret = -EFAULT; | |
7629 | goto out_fput; | |
7630 | } | |
08a45173 | 7631 | /* allow sparse sets */ |
600cf3f8 | 7632 | if (fd == -1) |
08a45173 | 7633 | continue; |
6b06314c | 7634 | |
05f3fb3c | 7635 | file = fget(fd); |
6b06314c | 7636 | ret = -EBADF; |
05f3fb3c | 7637 | if (!file) |
600cf3f8 | 7638 | goto out_fput; |
05f3fb3c | 7639 | |
6b06314c JA |
7640 | /* |
7641 | * Don't allow io_uring instances to be registered. If UNIX | |
7642 | * isn't enabled, then this causes a reference cycle and this | |
7643 | * instance can never get freed. If UNIX is enabled we'll | |
7644 | * handle it just fine, but there's still no point in allowing | |
7645 | * a ring fd as it doesn't support regular read/write anyway. | |
7646 | */ | |
05f3fb3c JA |
7647 | if (file->f_op == &io_uring_fops) { |
7648 | fput(file); | |
600cf3f8 | 7649 | goto out_fput; |
6b06314c | 7650 | } |
600cf3f8 PB |
7651 | table = &file_data->table[i >> IORING_FILE_TABLE_SHIFT]; |
7652 | index = i & IORING_FILE_TABLE_MASK; | |
05f3fb3c | 7653 | table->files[index] = file; |
6b06314c JA |
7654 | } |
7655 | ||
6b06314c | 7656 | ret = io_sqe_files_scm(ctx); |
05589553 | 7657 | if (ret) { |
6b06314c | 7658 | io_sqe_files_unregister(ctx); |
05589553 XW |
7659 | return ret; |
7660 | } | |
6b06314c | 7661 | |
05589553 XW |
7662 | ref_node = alloc_fixed_file_ref_node(ctx); |
7663 | if (IS_ERR(ref_node)) { | |
7664 | io_sqe_files_unregister(ctx); | |
7665 | return PTR_ERR(ref_node); | |
7666 | } | |
7667 | ||
b2e96852 | 7668 | file_data->node = ref_node; |
5398ae69 | 7669 | spin_lock(&file_data->lock); |
e297822b | 7670 | list_add_tail(&ref_node->node, &file_data->ref_list); |
5398ae69 PB |
7671 | spin_unlock(&file_data->lock); |
7672 | percpu_ref_get(&file_data->refs); | |
6b06314c | 7673 | return ret; |
600cf3f8 PB |
7674 | out_fput: |
7675 | for (i = 0; i < ctx->nr_user_files; i++) { | |
7676 | file = io_file_from_index(ctx, i); | |
7677 | if (file) | |
7678 | fput(file); | |
7679 | } | |
7680 | for (i = 0; i < nr_tables; i++) | |
7681 | kfree(file_data->table[i].files); | |
7682 | ctx->nr_user_files = 0; | |
7683 | out_ref: | |
7684 | percpu_ref_exit(&file_data->refs); | |
7685 | out_free: | |
7686 | kfree(file_data->table); | |
7687 | kfree(file_data); | |
55cbc256 | 7688 | ctx->file_data = NULL; |
6b06314c JA |
7689 | return ret; |
7690 | } | |
7691 | ||
c3a31e60 JA |
7692 | static int io_sqe_file_register(struct io_ring_ctx *ctx, struct file *file, |
7693 | int index) | |
7694 | { | |
7695 | #if defined(CONFIG_UNIX) | |
7696 | struct sock *sock = ctx->ring_sock->sk; | |
7697 | struct sk_buff_head *head = &sock->sk_receive_queue; | |
7698 | struct sk_buff *skb; | |
7699 | ||
7700 | /* | |
7701 | * See if we can merge this file into an existing skb SCM_RIGHTS | |
7702 | * file set. If there's no room, fall back to allocating a new skb | |
7703 | * and filling it in. | |
7704 | */ | |
7705 | spin_lock_irq(&head->lock); | |
7706 | skb = skb_peek(head); | |
7707 | if (skb) { | |
7708 | struct scm_fp_list *fpl = UNIXCB(skb).fp; | |
7709 | ||
7710 | if (fpl->count < SCM_MAX_FD) { | |
7711 | __skb_unlink(skb, head); | |
7712 | spin_unlock_irq(&head->lock); | |
7713 | fpl->fp[fpl->count] = get_file(file); | |
7714 | unix_inflight(fpl->user, fpl->fp[fpl->count]); | |
7715 | fpl->count++; | |
7716 | spin_lock_irq(&head->lock); | |
7717 | __skb_queue_head(head, skb); | |
7718 | } else { | |
7719 | skb = NULL; | |
7720 | } | |
7721 | } | |
7722 | spin_unlock_irq(&head->lock); | |
7723 | ||
7724 | if (skb) { | |
7725 | fput(file); | |
7726 | return 0; | |
7727 | } | |
7728 | ||
7729 | return __io_sqe_files_scm(ctx, 1, index); | |
7730 | #else | |
7731 | return 0; | |
7732 | #endif | |
7733 | } | |
7734 | ||
a5318d3c | 7735 | static int io_queue_file_removal(struct fixed_file_data *data, |
05589553 | 7736 | struct file *file) |
05f3fb3c | 7737 | { |
a5318d3c | 7738 | struct io_file_put *pfile; |
b2e96852 | 7739 | struct fixed_file_ref_node *ref_node = data->node; |
05f3fb3c | 7740 | |
05f3fb3c | 7741 | pfile = kzalloc(sizeof(*pfile), GFP_KERNEL); |
a5318d3c HD |
7742 | if (!pfile) |
7743 | return -ENOMEM; | |
05f3fb3c JA |
7744 | |
7745 | pfile->file = file; | |
05589553 XW |
7746 | list_add(&pfile->list, &ref_node->file_list); |
7747 | ||
a5318d3c | 7748 | return 0; |
05f3fb3c JA |
7749 | } |
7750 | ||
7751 | static int __io_sqe_files_update(struct io_ring_ctx *ctx, | |
7752 | struct io_uring_files_update *up, | |
7753 | unsigned nr_args) | |
7754 | { | |
7755 | struct fixed_file_data *data = ctx->file_data; | |
05589553 | 7756 | struct fixed_file_ref_node *ref_node; |
05f3fb3c | 7757 | struct file *file; |
c3a31e60 JA |
7758 | __s32 __user *fds; |
7759 | int fd, i, err; | |
7760 | __u32 done; | |
05589553 | 7761 | bool needs_switch = false; |
c3a31e60 | 7762 | |
05f3fb3c | 7763 | if (check_add_overflow(up->offset, nr_args, &done)) |
c3a31e60 JA |
7764 | return -EOVERFLOW; |
7765 | if (done > ctx->nr_user_files) | |
7766 | return -EINVAL; | |
7767 | ||
05589553 XW |
7768 | ref_node = alloc_fixed_file_ref_node(ctx); |
7769 | if (IS_ERR(ref_node)) | |
7770 | return PTR_ERR(ref_node); | |
7771 | ||
c3a31e60 | 7772 | done = 0; |
05f3fb3c | 7773 | fds = u64_to_user_ptr(up->fds); |
c3a31e60 | 7774 | while (nr_args) { |
65e19f54 JA |
7775 | struct fixed_file_table *table; |
7776 | unsigned index; | |
7777 | ||
c3a31e60 JA |
7778 | err = 0; |
7779 | if (copy_from_user(&fd, &fds[done], sizeof(fd))) { | |
7780 | err = -EFAULT; | |
7781 | break; | |
7782 | } | |
05f3fb3c JA |
7783 | i = array_index_nospec(up->offset, ctx->nr_user_files); |
7784 | table = &ctx->file_data->table[i >> IORING_FILE_TABLE_SHIFT]; | |
65e19f54 JA |
7785 | index = i & IORING_FILE_TABLE_MASK; |
7786 | if (table->files[index]) { | |
98dfd502 | 7787 | file = table->files[index]; |
a5318d3c HD |
7788 | err = io_queue_file_removal(data, file); |
7789 | if (err) | |
7790 | break; | |
65e19f54 | 7791 | table->files[index] = NULL; |
05589553 | 7792 | needs_switch = true; |
c3a31e60 JA |
7793 | } |
7794 | if (fd != -1) { | |
c3a31e60 JA |
7795 | file = fget(fd); |
7796 | if (!file) { | |
7797 | err = -EBADF; | |
7798 | break; | |
7799 | } | |
7800 | /* | |
7801 | * Don't allow io_uring instances to be registered. If | |
7802 | * UNIX isn't enabled, then this causes a reference | |
7803 | * cycle and this instance can never get freed. If UNIX | |
7804 | * is enabled we'll handle it just fine, but there's | |
7805 | * still no point in allowing a ring fd as it doesn't | |
7806 | * support regular read/write anyway. | |
7807 | */ | |
7808 | if (file->f_op == &io_uring_fops) { | |
7809 | fput(file); | |
7810 | err = -EBADF; | |
7811 | break; | |
7812 | } | |
65e19f54 | 7813 | table->files[index] = file; |
c3a31e60 | 7814 | err = io_sqe_file_register(ctx, file, i); |
f3bd9dae | 7815 | if (err) { |
95d1c8e5 | 7816 | table->files[index] = NULL; |
f3bd9dae | 7817 | fput(file); |
c3a31e60 | 7818 | break; |
f3bd9dae | 7819 | } |
c3a31e60 JA |
7820 | } |
7821 | nr_args--; | |
7822 | done++; | |
05f3fb3c JA |
7823 | up->offset++; |
7824 | } | |
7825 | ||
05589553 | 7826 | if (needs_switch) { |
b2e96852 | 7827 | percpu_ref_kill(&data->node->refs); |
6a4d07cd | 7828 | spin_lock(&data->lock); |
e297822b | 7829 | list_add_tail(&ref_node->node, &data->ref_list); |
b2e96852 | 7830 | data->node = ref_node; |
6a4d07cd | 7831 | spin_unlock(&data->lock); |
05589553 XW |
7832 | percpu_ref_get(&ctx->file_data->refs); |
7833 | } else | |
7834 | destroy_fixed_file_ref_node(ref_node); | |
c3a31e60 JA |
7835 | |
7836 | return done ? done : err; | |
7837 | } | |
05589553 | 7838 | |
05f3fb3c JA |
7839 | static int io_sqe_files_update(struct io_ring_ctx *ctx, void __user *arg, |
7840 | unsigned nr_args) | |
7841 | { | |
7842 | struct io_uring_files_update up; | |
7843 | ||
7844 | if (!ctx->file_data) | |
7845 | return -ENXIO; | |
7846 | if (!nr_args) | |
7847 | return -EINVAL; | |
7848 | if (copy_from_user(&up, arg, sizeof(up))) | |
7849 | return -EFAULT; | |
7850 | if (up.resv) | |
7851 | return -EINVAL; | |
7852 | ||
7853 | return __io_sqe_files_update(ctx, &up, nr_args); | |
7854 | } | |
c3a31e60 | 7855 | |
e9fd9396 | 7856 | static void io_free_work(struct io_wq_work *work) |
7d723065 JA |
7857 | { |
7858 | struct io_kiocb *req = container_of(work, struct io_kiocb, work); | |
7859 | ||
e9fd9396 | 7860 | /* Consider that io_steal_work() relies on this ref */ |
7d723065 JA |
7861 | io_put_req(req); |
7862 | } | |
7863 | ||
24369c2e PB |
7864 | static int io_init_wq_offload(struct io_ring_ctx *ctx, |
7865 | struct io_uring_params *p) | |
7866 | { | |
7867 | struct io_wq_data data; | |
7868 | struct fd f; | |
7869 | struct io_ring_ctx *ctx_attach; | |
7870 | unsigned int concurrency; | |
7871 | int ret = 0; | |
7872 | ||
7873 | data.user = ctx->user; | |
e9fd9396 | 7874 | data.free_work = io_free_work; |
f5fa38c5 | 7875 | data.do_work = io_wq_submit_work; |
24369c2e PB |
7876 | |
7877 | if (!(p->flags & IORING_SETUP_ATTACH_WQ)) { | |
7878 | /* Do QD, or 4 * CPUS, whatever is smallest */ | |
7879 | concurrency = min(ctx->sq_entries, 4 * num_online_cpus()); | |
7880 | ||
7881 | ctx->io_wq = io_wq_create(concurrency, &data); | |
7882 | if (IS_ERR(ctx->io_wq)) { | |
7883 | ret = PTR_ERR(ctx->io_wq); | |
7884 | ctx->io_wq = NULL; | |
7885 | } | |
7886 | return ret; | |
7887 | } | |
7888 | ||
7889 | f = fdget(p->wq_fd); | |
7890 | if (!f.file) | |
7891 | return -EBADF; | |
7892 | ||
7893 | if (f.file->f_op != &io_uring_fops) { | |
7894 | ret = -EINVAL; | |
7895 | goto out_fput; | |
7896 | } | |
7897 | ||
7898 | ctx_attach = f.file->private_data; | |
7899 | /* @io_wq is protected by holding the fd */ | |
7900 | if (!io_wq_get(ctx_attach->io_wq, &data)) { | |
7901 | ret = -EINVAL; | |
7902 | goto out_fput; | |
7903 | } | |
7904 | ||
7905 | ctx->io_wq = ctx_attach->io_wq; | |
7906 | out_fput: | |
7907 | fdput(f); | |
7908 | return ret; | |
7909 | } | |
7910 | ||
0f212204 JA |
7911 | static int io_uring_alloc_task_context(struct task_struct *task) |
7912 | { | |
7913 | struct io_uring_task *tctx; | |
d8a6df10 | 7914 | int ret; |
0f212204 JA |
7915 | |
7916 | tctx = kmalloc(sizeof(*tctx), GFP_KERNEL); | |
7917 | if (unlikely(!tctx)) | |
7918 | return -ENOMEM; | |
7919 | ||
d8a6df10 JA |
7920 | ret = percpu_counter_init(&tctx->inflight, 0, GFP_KERNEL); |
7921 | if (unlikely(ret)) { | |
7922 | kfree(tctx); | |
7923 | return ret; | |
7924 | } | |
7925 | ||
0f212204 JA |
7926 | xa_init(&tctx->xa); |
7927 | init_waitqueue_head(&tctx->wait); | |
7928 | tctx->last = NULL; | |
fdaf083c JA |
7929 | atomic_set(&tctx->in_idle, 0); |
7930 | tctx->sqpoll = false; | |
500a373d JA |
7931 | io_init_identity(&tctx->__identity); |
7932 | tctx->identity = &tctx->__identity; | |
0f212204 JA |
7933 | task->io_uring = tctx; |
7934 | return 0; | |
7935 | } | |
7936 | ||
7937 | void __io_uring_free(struct task_struct *tsk) | |
7938 | { | |
7939 | struct io_uring_task *tctx = tsk->io_uring; | |
7940 | ||
7941 | WARN_ON_ONCE(!xa_empty(&tctx->xa)); | |
500a373d JA |
7942 | WARN_ON_ONCE(refcount_read(&tctx->identity->count) != 1); |
7943 | if (tctx->identity != &tctx->__identity) | |
7944 | kfree(tctx->identity); | |
d8a6df10 | 7945 | percpu_counter_destroy(&tctx->inflight); |
0f212204 JA |
7946 | kfree(tctx); |
7947 | tsk->io_uring = NULL; | |
7948 | } | |
7949 | ||
7e84e1c7 SG |
7950 | static int io_sq_offload_create(struct io_ring_ctx *ctx, |
7951 | struct io_uring_params *p) | |
2b188cc1 JA |
7952 | { |
7953 | int ret; | |
7954 | ||
6c271ce2 | 7955 | if (ctx->flags & IORING_SETUP_SQPOLL) { |
534ca6d6 JA |
7956 | struct io_sq_data *sqd; |
7957 | ||
3ec482d1 | 7958 | ret = -EPERM; |
ce59fc69 | 7959 | if (!capable(CAP_SYS_ADMIN) && !capable(CAP_SYS_NICE)) |
3ec482d1 JA |
7960 | goto err; |
7961 | ||
534ca6d6 JA |
7962 | sqd = io_get_sq_data(p); |
7963 | if (IS_ERR(sqd)) { | |
7964 | ret = PTR_ERR(sqd); | |
7965 | goto err; | |
7966 | } | |
69fb2131 | 7967 | |
534ca6d6 | 7968 | ctx->sq_data = sqd; |
69fb2131 JA |
7969 | io_sq_thread_park(sqd); |
7970 | mutex_lock(&sqd->ctx_lock); | |
7971 | list_add(&ctx->sqd_list, &sqd->ctx_new_list); | |
7972 | mutex_unlock(&sqd->ctx_lock); | |
7973 | io_sq_thread_unpark(sqd); | |
534ca6d6 | 7974 | |
917257da JA |
7975 | ctx->sq_thread_idle = msecs_to_jiffies(p->sq_thread_idle); |
7976 | if (!ctx->sq_thread_idle) | |
7977 | ctx->sq_thread_idle = HZ; | |
7978 | ||
aa06165d JA |
7979 | if (sqd->thread) |
7980 | goto done; | |
7981 | ||
6c271ce2 | 7982 | if (p->flags & IORING_SETUP_SQ_AFF) { |
44a9bd18 | 7983 | int cpu = p->sq_thread_cpu; |
6c271ce2 | 7984 | |
917257da | 7985 | ret = -EINVAL; |
44a9bd18 JA |
7986 | if (cpu >= nr_cpu_ids) |
7987 | goto err; | |
7889f44d | 7988 | if (!cpu_online(cpu)) |
917257da JA |
7989 | goto err; |
7990 | ||
69fb2131 | 7991 | sqd->thread = kthread_create_on_cpu(io_sq_thread, sqd, |
534ca6d6 | 7992 | cpu, "io_uring-sq"); |
6c271ce2 | 7993 | } else { |
69fb2131 | 7994 | sqd->thread = kthread_create(io_sq_thread, sqd, |
6c271ce2 JA |
7995 | "io_uring-sq"); |
7996 | } | |
534ca6d6 JA |
7997 | if (IS_ERR(sqd->thread)) { |
7998 | ret = PTR_ERR(sqd->thread); | |
7999 | sqd->thread = NULL; | |
6c271ce2 JA |
8000 | goto err; |
8001 | } | |
534ca6d6 | 8002 | ret = io_uring_alloc_task_context(sqd->thread); |
0f212204 JA |
8003 | if (ret) |
8004 | goto err; | |
6c271ce2 JA |
8005 | } else if (p->flags & IORING_SETUP_SQ_AFF) { |
8006 | /* Can't have SQ_AFF without SQPOLL */ | |
8007 | ret = -EINVAL; | |
8008 | goto err; | |
8009 | } | |
8010 | ||
aa06165d | 8011 | done: |
24369c2e PB |
8012 | ret = io_init_wq_offload(ctx, p); |
8013 | if (ret) | |
2b188cc1 | 8014 | goto err; |
2b188cc1 JA |
8015 | |
8016 | return 0; | |
8017 | err: | |
54a91f3b | 8018 | io_finish_async(ctx); |
2b188cc1 JA |
8019 | return ret; |
8020 | } | |
8021 | ||
7e84e1c7 SG |
8022 | static void io_sq_offload_start(struct io_ring_ctx *ctx) |
8023 | { | |
534ca6d6 JA |
8024 | struct io_sq_data *sqd = ctx->sq_data; |
8025 | ||
8026 | if ((ctx->flags & IORING_SETUP_SQPOLL) && sqd->thread) | |
8027 | wake_up_process(sqd->thread); | |
7e84e1c7 SG |
8028 | } |
8029 | ||
a087e2b5 BM |
8030 | static inline void __io_unaccount_mem(struct user_struct *user, |
8031 | unsigned long nr_pages) | |
2b188cc1 JA |
8032 | { |
8033 | atomic_long_sub(nr_pages, &user->locked_vm); | |
8034 | } | |
8035 | ||
a087e2b5 BM |
8036 | static inline int __io_account_mem(struct user_struct *user, |
8037 | unsigned long nr_pages) | |
2b188cc1 JA |
8038 | { |
8039 | unsigned long page_limit, cur_pages, new_pages; | |
8040 | ||
8041 | /* Don't allow more pages than we can safely lock */ | |
8042 | page_limit = rlimit(RLIMIT_MEMLOCK) >> PAGE_SHIFT; | |
8043 | ||
8044 | do { | |
8045 | cur_pages = atomic_long_read(&user->locked_vm); | |
8046 | new_pages = cur_pages + nr_pages; | |
8047 | if (new_pages > page_limit) | |
8048 | return -ENOMEM; | |
8049 | } while (atomic_long_cmpxchg(&user->locked_vm, cur_pages, | |
8050 | new_pages) != cur_pages); | |
8051 | ||
8052 | return 0; | |
8053 | } | |
8054 | ||
2e0464d4 BM |
8055 | static void io_unaccount_mem(struct io_ring_ctx *ctx, unsigned long nr_pages, |
8056 | enum io_mem_account acct) | |
a087e2b5 | 8057 | { |
aad5d8da | 8058 | if (ctx->limit_mem) |
a087e2b5 | 8059 | __io_unaccount_mem(ctx->user, nr_pages); |
30975825 | 8060 | |
2aede0e4 | 8061 | if (ctx->mm_account) { |
2e0464d4 | 8062 | if (acct == ACCT_LOCKED) |
2aede0e4 | 8063 | ctx->mm_account->locked_vm -= nr_pages; |
2e0464d4 | 8064 | else if (acct == ACCT_PINNED) |
2aede0e4 | 8065 | atomic64_sub(nr_pages, &ctx->mm_account->pinned_vm); |
2e0464d4 | 8066 | } |
a087e2b5 BM |
8067 | } |
8068 | ||
2e0464d4 BM |
8069 | static int io_account_mem(struct io_ring_ctx *ctx, unsigned long nr_pages, |
8070 | enum io_mem_account acct) | |
a087e2b5 | 8071 | { |
30975825 BM |
8072 | int ret; |
8073 | ||
8074 | if (ctx->limit_mem) { | |
8075 | ret = __io_account_mem(ctx->user, nr_pages); | |
8076 | if (ret) | |
8077 | return ret; | |
8078 | } | |
8079 | ||
2aede0e4 | 8080 | if (ctx->mm_account) { |
2e0464d4 | 8081 | if (acct == ACCT_LOCKED) |
2aede0e4 | 8082 | ctx->mm_account->locked_vm += nr_pages; |
2e0464d4 | 8083 | else if (acct == ACCT_PINNED) |
2aede0e4 | 8084 | atomic64_add(nr_pages, &ctx->mm_account->pinned_vm); |
2e0464d4 | 8085 | } |
a087e2b5 BM |
8086 | |
8087 | return 0; | |
8088 | } | |
8089 | ||
2b188cc1 JA |
8090 | static void io_mem_free(void *ptr) |
8091 | { | |
52e04ef4 MR |
8092 | struct page *page; |
8093 | ||
8094 | if (!ptr) | |
8095 | return; | |
2b188cc1 | 8096 | |
52e04ef4 | 8097 | page = virt_to_head_page(ptr); |
2b188cc1 JA |
8098 | if (put_page_testzero(page)) |
8099 | free_compound_page(page); | |
8100 | } | |
8101 | ||
8102 | static void *io_mem_alloc(size_t size) | |
8103 | { | |
8104 | gfp_t gfp_flags = GFP_KERNEL | __GFP_ZERO | __GFP_NOWARN | __GFP_COMP | | |
8105 | __GFP_NORETRY; | |
8106 | ||
8107 | return (void *) __get_free_pages(gfp_flags, get_order(size)); | |
8108 | } | |
8109 | ||
75b28aff HV |
8110 | static unsigned long rings_size(unsigned sq_entries, unsigned cq_entries, |
8111 | size_t *sq_offset) | |
8112 | { | |
8113 | struct io_rings *rings; | |
8114 | size_t off, sq_array_size; | |
8115 | ||
8116 | off = struct_size(rings, cqes, cq_entries); | |
8117 | if (off == SIZE_MAX) | |
8118 | return SIZE_MAX; | |
8119 | ||
8120 | #ifdef CONFIG_SMP | |
8121 | off = ALIGN(off, SMP_CACHE_BYTES); | |
8122 | if (off == 0) | |
8123 | return SIZE_MAX; | |
8124 | #endif | |
8125 | ||
b36200f5 DV |
8126 | if (sq_offset) |
8127 | *sq_offset = off; | |
8128 | ||
75b28aff HV |
8129 | sq_array_size = array_size(sizeof(u32), sq_entries); |
8130 | if (sq_array_size == SIZE_MAX) | |
8131 | return SIZE_MAX; | |
8132 | ||
8133 | if (check_add_overflow(off, sq_array_size, &off)) | |
8134 | return SIZE_MAX; | |
8135 | ||
75b28aff HV |
8136 | return off; |
8137 | } | |
8138 | ||
2b188cc1 JA |
8139 | static unsigned long ring_pages(unsigned sq_entries, unsigned cq_entries) |
8140 | { | |
75b28aff | 8141 | size_t pages; |
2b188cc1 | 8142 | |
75b28aff HV |
8143 | pages = (size_t)1 << get_order( |
8144 | rings_size(sq_entries, cq_entries, NULL)); | |
8145 | pages += (size_t)1 << get_order( | |
8146 | array_size(sizeof(struct io_uring_sqe), sq_entries)); | |
2b188cc1 | 8147 | |
75b28aff | 8148 | return pages; |
2b188cc1 JA |
8149 | } |
8150 | ||
edafccee JA |
8151 | static int io_sqe_buffer_unregister(struct io_ring_ctx *ctx) |
8152 | { | |
8153 | int i, j; | |
8154 | ||
8155 | if (!ctx->user_bufs) | |
8156 | return -ENXIO; | |
8157 | ||
8158 | for (i = 0; i < ctx->nr_user_bufs; i++) { | |
8159 | struct io_mapped_ubuf *imu = &ctx->user_bufs[i]; | |
8160 | ||
8161 | for (j = 0; j < imu->nr_bvecs; j++) | |
f1f6a7dd | 8162 | unpin_user_page(imu->bvec[j].bv_page); |
edafccee | 8163 | |
de293938 JA |
8164 | if (imu->acct_pages) |
8165 | io_unaccount_mem(ctx, imu->acct_pages, ACCT_PINNED); | |
d4ef6475 | 8166 | kvfree(imu->bvec); |
edafccee JA |
8167 | imu->nr_bvecs = 0; |
8168 | } | |
8169 | ||
8170 | kfree(ctx->user_bufs); | |
8171 | ctx->user_bufs = NULL; | |
8172 | ctx->nr_user_bufs = 0; | |
8173 | return 0; | |
8174 | } | |
8175 | ||
8176 | static int io_copy_iov(struct io_ring_ctx *ctx, struct iovec *dst, | |
8177 | void __user *arg, unsigned index) | |
8178 | { | |
8179 | struct iovec __user *src; | |
8180 | ||
8181 | #ifdef CONFIG_COMPAT | |
8182 | if (ctx->compat) { | |
8183 | struct compat_iovec __user *ciovs; | |
8184 | struct compat_iovec ciov; | |
8185 | ||
8186 | ciovs = (struct compat_iovec __user *) arg; | |
8187 | if (copy_from_user(&ciov, &ciovs[index], sizeof(ciov))) | |
8188 | return -EFAULT; | |
8189 | ||
d55e5f5b | 8190 | dst->iov_base = u64_to_user_ptr((u64)ciov.iov_base); |
edafccee JA |
8191 | dst->iov_len = ciov.iov_len; |
8192 | return 0; | |
8193 | } | |
8194 | #endif | |
8195 | src = (struct iovec __user *) arg; | |
8196 | if (copy_from_user(dst, &src[index], sizeof(*dst))) | |
8197 | return -EFAULT; | |
8198 | return 0; | |
8199 | } | |
8200 | ||
de293938 JA |
8201 | /* |
8202 | * Not super efficient, but this is just a registration time. And we do cache | |
8203 | * the last compound head, so generally we'll only do a full search if we don't | |
8204 | * match that one. | |
8205 | * | |
8206 | * We check if the given compound head page has already been accounted, to | |
8207 | * avoid double accounting it. This allows us to account the full size of the | |
8208 | * page, not just the constituent pages of a huge page. | |
8209 | */ | |
8210 | static bool headpage_already_acct(struct io_ring_ctx *ctx, struct page **pages, | |
8211 | int nr_pages, struct page *hpage) | |
8212 | { | |
8213 | int i, j; | |
8214 | ||
8215 | /* check current page array */ | |
8216 | for (i = 0; i < nr_pages; i++) { | |
8217 | if (!PageCompound(pages[i])) | |
8218 | continue; | |
8219 | if (compound_head(pages[i]) == hpage) | |
8220 | return true; | |
8221 | } | |
8222 | ||
8223 | /* check previously registered pages */ | |
8224 | for (i = 0; i < ctx->nr_user_bufs; i++) { | |
8225 | struct io_mapped_ubuf *imu = &ctx->user_bufs[i]; | |
8226 | ||
8227 | for (j = 0; j < imu->nr_bvecs; j++) { | |
8228 | if (!PageCompound(imu->bvec[j].bv_page)) | |
8229 | continue; | |
8230 | if (compound_head(imu->bvec[j].bv_page) == hpage) | |
8231 | return true; | |
8232 | } | |
8233 | } | |
8234 | ||
8235 | return false; | |
8236 | } | |
8237 | ||
8238 | static int io_buffer_account_pin(struct io_ring_ctx *ctx, struct page **pages, | |
8239 | int nr_pages, struct io_mapped_ubuf *imu, | |
8240 | struct page **last_hpage) | |
8241 | { | |
8242 | int i, ret; | |
8243 | ||
8244 | for (i = 0; i < nr_pages; i++) { | |
8245 | if (!PageCompound(pages[i])) { | |
8246 | imu->acct_pages++; | |
8247 | } else { | |
8248 | struct page *hpage; | |
8249 | ||
8250 | hpage = compound_head(pages[i]); | |
8251 | if (hpage == *last_hpage) | |
8252 | continue; | |
8253 | *last_hpage = hpage; | |
8254 | if (headpage_already_acct(ctx, pages, i, hpage)) | |
8255 | continue; | |
8256 | imu->acct_pages += page_size(hpage) >> PAGE_SHIFT; | |
8257 | } | |
8258 | } | |
8259 | ||
8260 | if (!imu->acct_pages) | |
8261 | return 0; | |
8262 | ||
8263 | ret = io_account_mem(ctx, imu->acct_pages, ACCT_PINNED); | |
8264 | if (ret) | |
8265 | imu->acct_pages = 0; | |
8266 | return ret; | |
8267 | } | |
8268 | ||
edafccee JA |
8269 | static int io_sqe_buffer_register(struct io_ring_ctx *ctx, void __user *arg, |
8270 | unsigned nr_args) | |
8271 | { | |
8272 | struct vm_area_struct **vmas = NULL; | |
8273 | struct page **pages = NULL; | |
de293938 | 8274 | struct page *last_hpage = NULL; |
edafccee JA |
8275 | int i, j, got_pages = 0; |
8276 | int ret = -EINVAL; | |
8277 | ||
8278 | if (ctx->user_bufs) | |
8279 | return -EBUSY; | |
8280 | if (!nr_args || nr_args > UIO_MAXIOV) | |
8281 | return -EINVAL; | |
8282 | ||
8283 | ctx->user_bufs = kcalloc(nr_args, sizeof(struct io_mapped_ubuf), | |
8284 | GFP_KERNEL); | |
8285 | if (!ctx->user_bufs) | |
8286 | return -ENOMEM; | |
8287 | ||
8288 | for (i = 0; i < nr_args; i++) { | |
8289 | struct io_mapped_ubuf *imu = &ctx->user_bufs[i]; | |
8290 | unsigned long off, start, end, ubuf; | |
8291 | int pret, nr_pages; | |
8292 | struct iovec iov; | |
8293 | size_t size; | |
8294 | ||
8295 | ret = io_copy_iov(ctx, &iov, arg, i); | |
8296 | if (ret) | |
a278682d | 8297 | goto err; |
edafccee JA |
8298 | |
8299 | /* | |
8300 | * Don't impose further limits on the size and buffer | |
8301 | * constraints here, we'll -EINVAL later when IO is | |
8302 | * submitted if they are wrong. | |
8303 | */ | |
8304 | ret = -EFAULT; | |
8305 | if (!iov.iov_base || !iov.iov_len) | |
8306 | goto err; | |
8307 | ||
8308 | /* arbitrary limit, but we need something */ | |
8309 | if (iov.iov_len > SZ_1G) | |
8310 | goto err; | |
8311 | ||
8312 | ubuf = (unsigned long) iov.iov_base; | |
8313 | end = (ubuf + iov.iov_len + PAGE_SIZE - 1) >> PAGE_SHIFT; | |
8314 | start = ubuf >> PAGE_SHIFT; | |
8315 | nr_pages = end - start; | |
8316 | ||
edafccee JA |
8317 | ret = 0; |
8318 | if (!pages || nr_pages > got_pages) { | |
a8c73c1a DE |
8319 | kvfree(vmas); |
8320 | kvfree(pages); | |
d4ef6475 | 8321 | pages = kvmalloc_array(nr_pages, sizeof(struct page *), |
edafccee | 8322 | GFP_KERNEL); |
d4ef6475 | 8323 | vmas = kvmalloc_array(nr_pages, |
edafccee JA |
8324 | sizeof(struct vm_area_struct *), |
8325 | GFP_KERNEL); | |
8326 | if (!pages || !vmas) { | |
8327 | ret = -ENOMEM; | |
edafccee JA |
8328 | goto err; |
8329 | } | |
8330 | got_pages = nr_pages; | |
8331 | } | |
8332 | ||
d4ef6475 | 8333 | imu->bvec = kvmalloc_array(nr_pages, sizeof(struct bio_vec), |
edafccee JA |
8334 | GFP_KERNEL); |
8335 | ret = -ENOMEM; | |
de293938 | 8336 | if (!imu->bvec) |
edafccee | 8337 | goto err; |
edafccee JA |
8338 | |
8339 | ret = 0; | |
d8ed45c5 | 8340 | mmap_read_lock(current->mm); |
2113b05d | 8341 | pret = pin_user_pages(ubuf, nr_pages, |
932f4a63 IW |
8342 | FOLL_WRITE | FOLL_LONGTERM, |
8343 | pages, vmas); | |
edafccee JA |
8344 | if (pret == nr_pages) { |
8345 | /* don't support file backed memory */ | |
8346 | for (j = 0; j < nr_pages; j++) { | |
8347 | struct vm_area_struct *vma = vmas[j]; | |
8348 | ||
8349 | if (vma->vm_file && | |
8350 | !is_file_hugepages(vma->vm_file)) { | |
8351 | ret = -EOPNOTSUPP; | |
8352 | break; | |
8353 | } | |
8354 | } | |
8355 | } else { | |
8356 | ret = pret < 0 ? pret : -EFAULT; | |
8357 | } | |
d8ed45c5 | 8358 | mmap_read_unlock(current->mm); |
edafccee JA |
8359 | if (ret) { |
8360 | /* | |
8361 | * if we did partial map, or found file backed vmas, | |
8362 | * release any pages we did get | |
8363 | */ | |
27c4d3a3 | 8364 | if (pret > 0) |
f1f6a7dd | 8365 | unpin_user_pages(pages, pret); |
de293938 JA |
8366 | kvfree(imu->bvec); |
8367 | goto err; | |
8368 | } | |
8369 | ||
8370 | ret = io_buffer_account_pin(ctx, pages, pret, imu, &last_hpage); | |
8371 | if (ret) { | |
8372 | unpin_user_pages(pages, pret); | |
d4ef6475 | 8373 | kvfree(imu->bvec); |
edafccee JA |
8374 | goto err; |
8375 | } | |
8376 | ||
8377 | off = ubuf & ~PAGE_MASK; | |
8378 | size = iov.iov_len; | |
8379 | for (j = 0; j < nr_pages; j++) { | |
8380 | size_t vec_len; | |
8381 | ||
8382 | vec_len = min_t(size_t, size, PAGE_SIZE - off); | |
8383 | imu->bvec[j].bv_page = pages[j]; | |
8384 | imu->bvec[j].bv_len = vec_len; | |
8385 | imu->bvec[j].bv_offset = off; | |
8386 | off = 0; | |
8387 | size -= vec_len; | |
8388 | } | |
8389 | /* store original address for later verification */ | |
8390 | imu->ubuf = ubuf; | |
8391 | imu->len = iov.iov_len; | |
8392 | imu->nr_bvecs = nr_pages; | |
8393 | ||
8394 | ctx->nr_user_bufs++; | |
8395 | } | |
d4ef6475 MR |
8396 | kvfree(pages); |
8397 | kvfree(vmas); | |
edafccee JA |
8398 | return 0; |
8399 | err: | |
d4ef6475 MR |
8400 | kvfree(pages); |
8401 | kvfree(vmas); | |
edafccee JA |
8402 | io_sqe_buffer_unregister(ctx); |
8403 | return ret; | |
8404 | } | |
8405 | ||
9b402849 JA |
8406 | static int io_eventfd_register(struct io_ring_ctx *ctx, void __user *arg) |
8407 | { | |
8408 | __s32 __user *fds = arg; | |
8409 | int fd; | |
8410 | ||
8411 | if (ctx->cq_ev_fd) | |
8412 | return -EBUSY; | |
8413 | ||
8414 | if (copy_from_user(&fd, fds, sizeof(*fds))) | |
8415 | return -EFAULT; | |
8416 | ||
8417 | ctx->cq_ev_fd = eventfd_ctx_fdget(fd); | |
8418 | if (IS_ERR(ctx->cq_ev_fd)) { | |
8419 | int ret = PTR_ERR(ctx->cq_ev_fd); | |
8420 | ctx->cq_ev_fd = NULL; | |
8421 | return ret; | |
8422 | } | |
8423 | ||
8424 | return 0; | |
8425 | } | |
8426 | ||
8427 | static int io_eventfd_unregister(struct io_ring_ctx *ctx) | |
8428 | { | |
8429 | if (ctx->cq_ev_fd) { | |
8430 | eventfd_ctx_put(ctx->cq_ev_fd); | |
8431 | ctx->cq_ev_fd = NULL; | |
8432 | return 0; | |
8433 | } | |
8434 | ||
8435 | return -ENXIO; | |
8436 | } | |
8437 | ||
5a2e745d JA |
8438 | static int __io_destroy_buffers(int id, void *p, void *data) |
8439 | { | |
8440 | struct io_ring_ctx *ctx = data; | |
8441 | struct io_buffer *buf = p; | |
8442 | ||
067524e9 | 8443 | __io_remove_buffers(ctx, buf, id, -1U); |
5a2e745d JA |
8444 | return 0; |
8445 | } | |
8446 | ||
8447 | static void io_destroy_buffers(struct io_ring_ctx *ctx) | |
8448 | { | |
8449 | idr_for_each(&ctx->io_buffer_idr, __io_destroy_buffers, ctx); | |
8450 | idr_destroy(&ctx->io_buffer_idr); | |
8451 | } | |
8452 | ||
2b188cc1 JA |
8453 | static void io_ring_ctx_free(struct io_ring_ctx *ctx) |
8454 | { | |
6b06314c | 8455 | io_finish_async(ctx); |
5dbcad51 | 8456 | io_sqe_buffer_unregister(ctx); |
2aede0e4 JA |
8457 | |
8458 | if (ctx->sqo_task) { | |
8459 | put_task_struct(ctx->sqo_task); | |
8460 | ctx->sqo_task = NULL; | |
8461 | mmdrop(ctx->mm_account); | |
8462 | ctx->mm_account = NULL; | |
30975825 | 8463 | } |
def596e9 | 8464 | |
91d8f519 DZ |
8465 | #ifdef CONFIG_BLK_CGROUP |
8466 | if (ctx->sqo_blkcg_css) | |
8467 | css_put(ctx->sqo_blkcg_css); | |
8468 | #endif | |
8469 | ||
6b06314c | 8470 | io_sqe_files_unregister(ctx); |
9b402849 | 8471 | io_eventfd_unregister(ctx); |
5a2e745d | 8472 | io_destroy_buffers(ctx); |
41726c9a | 8473 | idr_destroy(&ctx->personality_idr); |
def596e9 | 8474 | |
2b188cc1 | 8475 | #if defined(CONFIG_UNIX) |
355e8d26 EB |
8476 | if (ctx->ring_sock) { |
8477 | ctx->ring_sock->file = NULL; /* so that iput() is called */ | |
2b188cc1 | 8478 | sock_release(ctx->ring_sock); |
355e8d26 | 8479 | } |
2b188cc1 JA |
8480 | #endif |
8481 | ||
75b28aff | 8482 | io_mem_free(ctx->rings); |
2b188cc1 | 8483 | io_mem_free(ctx->sq_sqes); |
2b188cc1 JA |
8484 | |
8485 | percpu_ref_exit(&ctx->refs); | |
2b188cc1 | 8486 | free_uid(ctx->user); |
181e448d | 8487 | put_cred(ctx->creds); |
78076bb6 | 8488 | kfree(ctx->cancel_hash); |
0ddf92e8 | 8489 | kmem_cache_free(req_cachep, ctx->fallback_req); |
2b188cc1 JA |
8490 | kfree(ctx); |
8491 | } | |
8492 | ||
8493 | static __poll_t io_uring_poll(struct file *file, poll_table *wait) | |
8494 | { | |
8495 | struct io_ring_ctx *ctx = file->private_data; | |
8496 | __poll_t mask = 0; | |
8497 | ||
8498 | poll_wait(file, &ctx->cq_wait, wait); | |
4f7067c3 SB |
8499 | /* |
8500 | * synchronizes with barrier from wq_has_sleeper call in | |
8501 | * io_commit_cqring | |
8502 | */ | |
2b188cc1 | 8503 | smp_rmb(); |
90554200 | 8504 | if (!io_sqring_full(ctx)) |
2b188cc1 | 8505 | mask |= EPOLLOUT | EPOLLWRNORM; |
63e5d81f | 8506 | if (io_cqring_events(ctx, false)) |
2b188cc1 JA |
8507 | mask |= EPOLLIN | EPOLLRDNORM; |
8508 | ||
8509 | return mask; | |
8510 | } | |
8511 | ||
8512 | static int io_uring_fasync(int fd, struct file *file, int on) | |
8513 | { | |
8514 | struct io_ring_ctx *ctx = file->private_data; | |
8515 | ||
8516 | return fasync_helper(fd, file, on, &ctx->cq_fasync); | |
8517 | } | |
8518 | ||
071698e1 JA |
8519 | static int io_remove_personalities(int id, void *p, void *data) |
8520 | { | |
8521 | struct io_ring_ctx *ctx = data; | |
1e6fa521 | 8522 | struct io_identity *iod; |
071698e1 | 8523 | |
1e6fa521 JA |
8524 | iod = idr_remove(&ctx->personality_idr, id); |
8525 | if (iod) { | |
8526 | put_cred(iod->creds); | |
8527 | if (refcount_dec_and_test(&iod->count)) | |
8528 | kfree(iod); | |
8529 | } | |
071698e1 JA |
8530 | return 0; |
8531 | } | |
8532 | ||
85faa7b8 JA |
8533 | static void io_ring_exit_work(struct work_struct *work) |
8534 | { | |
b2edc0a7 PB |
8535 | struct io_ring_ctx *ctx = container_of(work, struct io_ring_ctx, |
8536 | exit_work); | |
85faa7b8 | 8537 | |
56952e91 JA |
8538 | /* |
8539 | * If we're doing polled IO and end up having requests being | |
8540 | * submitted async (out-of-line), then completions can come in while | |
8541 | * we're waiting for refs to drop. We need to reap these manually, | |
8542 | * as nobody else will be looking for them. | |
8543 | */ | |
b2edc0a7 | 8544 | do { |
56952e91 | 8545 | if (ctx->rings) |
e6c8aa9a | 8546 | io_cqring_overflow_flush(ctx, true, NULL, NULL); |
b2edc0a7 PB |
8547 | io_iopoll_try_reap_events(ctx); |
8548 | } while (!wait_for_completion_timeout(&ctx->ref_comp, HZ/20)); | |
85faa7b8 JA |
8549 | io_ring_ctx_free(ctx); |
8550 | } | |
8551 | ||
2b188cc1 JA |
8552 | static void io_ring_ctx_wait_and_kill(struct io_ring_ctx *ctx) |
8553 | { | |
8554 | mutex_lock(&ctx->uring_lock); | |
8555 | percpu_ref_kill(&ctx->refs); | |
8556 | mutex_unlock(&ctx->uring_lock); | |
8557 | ||
f3606e3a JA |
8558 | io_kill_timeouts(ctx, NULL); |
8559 | io_poll_remove_all(ctx, NULL); | |
561fb04a JA |
8560 | |
8561 | if (ctx->io_wq) | |
8562 | io_wq_cancel_all(ctx->io_wq); | |
8563 | ||
15dff286 JA |
8564 | /* if we failed setting up the ctx, we might not have any rings */ |
8565 | if (ctx->rings) | |
e6c8aa9a | 8566 | io_cqring_overflow_flush(ctx, true, NULL, NULL); |
b2edc0a7 | 8567 | io_iopoll_try_reap_events(ctx); |
071698e1 | 8568 | idr_for_each(&ctx->personality_idr, io_remove_personalities, ctx); |
309fc03a JA |
8569 | |
8570 | /* | |
8571 | * Do this upfront, so we won't have a grace period where the ring | |
8572 | * is closed but resources aren't reaped yet. This can cause | |
8573 | * spurious failure in setting up a new ring. | |
8574 | */ | |
760618f7 JA |
8575 | io_unaccount_mem(ctx, ring_pages(ctx->sq_entries, ctx->cq_entries), |
8576 | ACCT_LOCKED); | |
309fc03a | 8577 | |
85faa7b8 | 8578 | INIT_WORK(&ctx->exit_work, io_ring_exit_work); |
fc666777 JA |
8579 | /* |
8580 | * Use system_unbound_wq to avoid spawning tons of event kworkers | |
8581 | * if we're exiting a ton of rings at the same time. It just adds | |
8582 | * noise and overhead, there's no discernable change in runtime | |
8583 | * over using system_wq. | |
8584 | */ | |
8585 | queue_work(system_unbound_wq, &ctx->exit_work); | |
2b188cc1 JA |
8586 | } |
8587 | ||
8588 | static int io_uring_release(struct inode *inode, struct file *file) | |
8589 | { | |
8590 | struct io_ring_ctx *ctx = file->private_data; | |
8591 | ||
8592 | file->private_data = NULL; | |
8593 | io_ring_ctx_wait_and_kill(ctx); | |
8594 | return 0; | |
8595 | } | |
8596 | ||
67c4d9e6 PB |
8597 | static bool io_wq_files_match(struct io_wq_work *work, void *data) |
8598 | { | |
8599 | struct files_struct *files = data; | |
8600 | ||
dfead8a8 | 8601 | return !files || ((work->flags & IO_WQ_WORK_FILES) && |
98447d65 | 8602 | work->identity->files == files); |
67c4d9e6 PB |
8603 | } |
8604 | ||
f254ac04 JA |
8605 | /* |
8606 | * Returns true if 'preq' is the link parent of 'req' | |
8607 | */ | |
8608 | static bool io_match_link(struct io_kiocb *preq, struct io_kiocb *req) | |
8609 | { | |
8610 | struct io_kiocb *link; | |
8611 | ||
8612 | if (!(preq->flags & REQ_F_LINK_HEAD)) | |
8613 | return false; | |
8614 | ||
8615 | list_for_each_entry(link, &preq->link_list, link_list) { | |
8616 | if (link == req) | |
8617 | return true; | |
8618 | } | |
8619 | ||
8620 | return false; | |
8621 | } | |
8622 | ||
8623 | /* | |
8624 | * We're looking to cancel 'req' because it's holding on to our files, but | |
8625 | * 'req' could be a link to another request. See if it is, and cancel that | |
8626 | * parent request if so. | |
8627 | */ | |
8628 | static bool io_poll_remove_link(struct io_ring_ctx *ctx, struct io_kiocb *req) | |
8629 | { | |
8630 | struct hlist_node *tmp; | |
8631 | struct io_kiocb *preq; | |
8632 | bool found = false; | |
8633 | int i; | |
8634 | ||
8635 | spin_lock_irq(&ctx->completion_lock); | |
8636 | for (i = 0; i < (1U << ctx->cancel_hash_bits); i++) { | |
8637 | struct hlist_head *list; | |
8638 | ||
8639 | list = &ctx->cancel_hash[i]; | |
8640 | hlist_for_each_entry_safe(preq, tmp, list, hash_node) { | |
8641 | found = io_match_link(preq, req); | |
8642 | if (found) { | |
8643 | io_poll_remove_one(preq); | |
8644 | break; | |
8645 | } | |
8646 | } | |
8647 | } | |
8648 | spin_unlock_irq(&ctx->completion_lock); | |
8649 | return found; | |
8650 | } | |
8651 | ||
8652 | static bool io_timeout_remove_link(struct io_ring_ctx *ctx, | |
8653 | struct io_kiocb *req) | |
8654 | { | |
8655 | struct io_kiocb *preq; | |
8656 | bool found = false; | |
8657 | ||
8658 | spin_lock_irq(&ctx->completion_lock); | |
8659 | list_for_each_entry(preq, &ctx->timeout_list, timeout.list) { | |
8660 | found = io_match_link(preq, req); | |
8661 | if (found) { | |
8662 | __io_timeout_cancel(preq); | |
8663 | break; | |
8664 | } | |
8665 | } | |
8666 | spin_unlock_irq(&ctx->completion_lock); | |
8667 | return found; | |
8668 | } | |
8669 | ||
b711d4ea JA |
8670 | static bool io_cancel_link_cb(struct io_wq_work *work, void *data) |
8671 | { | |
9a472ef7 PB |
8672 | struct io_kiocb *req = container_of(work, struct io_kiocb, work); |
8673 | bool ret; | |
8674 | ||
8675 | if (req->flags & REQ_F_LINK_TIMEOUT) { | |
8676 | unsigned long flags; | |
8677 | struct io_ring_ctx *ctx = req->ctx; | |
8678 | ||
8679 | /* protect against races with linked timeouts */ | |
8680 | spin_lock_irqsave(&ctx->completion_lock, flags); | |
8681 | ret = io_match_link(req, data); | |
8682 | spin_unlock_irqrestore(&ctx->completion_lock, flags); | |
8683 | } else { | |
8684 | ret = io_match_link(req, data); | |
8685 | } | |
8686 | return ret; | |
b711d4ea JA |
8687 | } |
8688 | ||
8689 | static void io_attempt_cancel(struct io_ring_ctx *ctx, struct io_kiocb *req) | |
8690 | { | |
8691 | enum io_wq_cancel cret; | |
8692 | ||
8693 | /* cancel this particular work, if it's running */ | |
8694 | cret = io_wq_cancel_work(ctx->io_wq, &req->work); | |
8695 | if (cret != IO_WQ_CANCEL_NOTFOUND) | |
8696 | return; | |
8697 | ||
8698 | /* find links that hold this pending, cancel those */ | |
8699 | cret = io_wq_cancel_cb(ctx->io_wq, io_cancel_link_cb, req, true); | |
8700 | if (cret != IO_WQ_CANCEL_NOTFOUND) | |
8701 | return; | |
8702 | ||
8703 | /* if we have a poll link holding this pending, cancel that */ | |
8704 | if (io_poll_remove_link(ctx, req)) | |
8705 | return; | |
8706 | ||
8707 | /* final option, timeout link is holding this req pending */ | |
8708 | io_timeout_remove_link(ctx, req); | |
8709 | } | |
8710 | ||
b7ddce3c | 8711 | static void io_cancel_defer_files(struct io_ring_ctx *ctx, |
ef9865a4 | 8712 | struct task_struct *task, |
b7ddce3c PB |
8713 | struct files_struct *files) |
8714 | { | |
8715 | struct io_defer_entry *de = NULL; | |
8716 | LIST_HEAD(list); | |
8717 | ||
8718 | spin_lock_irq(&ctx->completion_lock); | |
8719 | list_for_each_entry_reverse(de, &ctx->defer_list, list) { | |
ef9865a4 PB |
8720 | if (io_task_match(de->req, task) && |
8721 | io_match_files(de->req, files)) { | |
b7ddce3c PB |
8722 | list_cut_position(&list, &ctx->defer_list, &de->list); |
8723 | break; | |
8724 | } | |
8725 | } | |
8726 | spin_unlock_irq(&ctx->completion_lock); | |
8727 | ||
8728 | while (!list_empty(&list)) { | |
8729 | de = list_first_entry(&list, struct io_defer_entry, list); | |
8730 | list_del_init(&de->list); | |
8731 | req_set_fail_links(de->req); | |
8732 | io_put_req(de->req); | |
8733 | io_req_complete(de->req, -ECANCELED); | |
8734 | kfree(de); | |
8735 | } | |
8736 | } | |
8737 | ||
76e1b642 JA |
8738 | /* |
8739 | * Returns true if we found and killed one or more files pinning requests | |
8740 | */ | |
8741 | static bool io_uring_cancel_files(struct io_ring_ctx *ctx, | |
fcb323cc JA |
8742 | struct files_struct *files) |
8743 | { | |
67c4d9e6 | 8744 | if (list_empty_careful(&ctx->inflight_list)) |
76e1b642 | 8745 | return false; |
67c4d9e6 PB |
8746 | |
8747 | /* cancel all at once, should be faster than doing it one by one*/ | |
8748 | io_wq_cancel_cb(ctx->io_wq, io_wq_files_match, files, true); | |
8749 | ||
fcb323cc | 8750 | while (!list_empty_careful(&ctx->inflight_list)) { |
d8f1b971 XW |
8751 | struct io_kiocb *cancel_req = NULL, *req; |
8752 | DEFINE_WAIT(wait); | |
fcb323cc JA |
8753 | |
8754 | spin_lock_irq(&ctx->inflight_lock); | |
8755 | list_for_each_entry(req, &ctx->inflight_list, inflight_entry) { | |
dfead8a8 | 8756 | if (files && (req->work.flags & IO_WQ_WORK_FILES) && |
98447d65 | 8757 | req->work.identity->files != files) |
768134d4 JA |
8758 | continue; |
8759 | /* req is being completed, ignore */ | |
8760 | if (!refcount_inc_not_zero(&req->refs)) | |
8761 | continue; | |
8762 | cancel_req = req; | |
8763 | break; | |
fcb323cc | 8764 | } |
768134d4 | 8765 | if (cancel_req) |
fcb323cc | 8766 | prepare_to_wait(&ctx->inflight_wait, &wait, |
768134d4 | 8767 | TASK_UNINTERRUPTIBLE); |
fcb323cc JA |
8768 | spin_unlock_irq(&ctx->inflight_lock); |
8769 | ||
768134d4 JA |
8770 | /* We need to keep going until we don't find a matching req */ |
8771 | if (!cancel_req) | |
fcb323cc | 8772 | break; |
bb175342 PB |
8773 | /* cancel this request, or head link requests */ |
8774 | io_attempt_cancel(ctx, cancel_req); | |
8775 | io_put_req(cancel_req); | |
6200b0ae JA |
8776 | /* cancellations _may_ trigger task work */ |
8777 | io_run_task_work(); | |
fcb323cc | 8778 | schedule(); |
d8f1b971 | 8779 | finish_wait(&ctx->inflight_wait, &wait); |
fcb323cc | 8780 | } |
76e1b642 JA |
8781 | |
8782 | return true; | |
fcb323cc JA |
8783 | } |
8784 | ||
801dd57b | 8785 | static bool io_cancel_task_cb(struct io_wq_work *work, void *data) |
44e728b8 | 8786 | { |
801dd57b PB |
8787 | struct io_kiocb *req = container_of(work, struct io_kiocb, work); |
8788 | struct task_struct *task = data; | |
44e728b8 | 8789 | |
f3606e3a | 8790 | return io_task_match(req, task); |
44e728b8 PB |
8791 | } |
8792 | ||
0f212204 JA |
8793 | static bool __io_uring_cancel_task_requests(struct io_ring_ctx *ctx, |
8794 | struct task_struct *task, | |
8795 | struct files_struct *files) | |
8796 | { | |
8797 | bool ret; | |
8798 | ||
8799 | ret = io_uring_cancel_files(ctx, files); | |
8800 | if (!files) { | |
8801 | enum io_wq_cancel cret; | |
8802 | ||
8803 | cret = io_wq_cancel_cb(ctx->io_wq, io_cancel_task_cb, task, true); | |
8804 | if (cret != IO_WQ_CANCEL_NOTFOUND) | |
8805 | ret = true; | |
8806 | ||
8807 | /* SQPOLL thread does its own polling */ | |
8808 | if (!(ctx->flags & IORING_SETUP_SQPOLL)) { | |
8809 | while (!list_empty_careful(&ctx->iopoll_list)) { | |
8810 | io_iopoll_try_reap_events(ctx); | |
8811 | ret = true; | |
8812 | } | |
8813 | } | |
8814 | ||
8815 | ret |= io_poll_remove_all(ctx, task); | |
8816 | ret |= io_kill_timeouts(ctx, task); | |
8817 | } | |
8818 | ||
8819 | return ret; | |
8820 | } | |
8821 | ||
8822 | /* | |
8823 | * We need to iteratively cancel requests, in case a request has dependent | |
8824 | * hard links. These persist even for failure of cancelations, hence keep | |
8825 | * looping until none are found. | |
8826 | */ | |
8827 | static void io_uring_cancel_task_requests(struct io_ring_ctx *ctx, | |
8828 | struct files_struct *files) | |
8829 | { | |
8830 | struct task_struct *task = current; | |
8831 | ||
fdaf083c | 8832 | if ((ctx->flags & IORING_SETUP_SQPOLL) && ctx->sq_data) { |
534ca6d6 | 8833 | task = ctx->sq_data->thread; |
fdaf083c JA |
8834 | atomic_inc(&task->io_uring->in_idle); |
8835 | io_sq_thread_park(ctx->sq_data); | |
8836 | } | |
0f212204 | 8837 | |
ef9865a4 PB |
8838 | if (files) |
8839 | io_cancel_defer_files(ctx, NULL, files); | |
8840 | else | |
8841 | io_cancel_defer_files(ctx, task, NULL); | |
8842 | ||
0f212204 JA |
8843 | io_cqring_overflow_flush(ctx, true, task, files); |
8844 | ||
8845 | while (__io_uring_cancel_task_requests(ctx, task, files)) { | |
8846 | io_run_task_work(); | |
8847 | cond_resched(); | |
8848 | } | |
fdaf083c JA |
8849 | |
8850 | if ((ctx->flags & IORING_SETUP_SQPOLL) && ctx->sq_data) { | |
8851 | atomic_dec(&task->io_uring->in_idle); | |
8852 | /* | |
8853 | * If the files that are going away are the ones in the thread | |
8854 | * identity, clear them out. | |
8855 | */ | |
8856 | if (task->io_uring->identity->files == files) | |
8857 | task->io_uring->identity->files = NULL; | |
8858 | io_sq_thread_unpark(ctx->sq_data); | |
8859 | } | |
0f212204 JA |
8860 | } |
8861 | ||
8862 | /* | |
8863 | * Note that this task has used io_uring. We use it for cancelation purposes. | |
8864 | */ | |
fdaf083c | 8865 | static int io_uring_add_task_file(struct io_ring_ctx *ctx, struct file *file) |
0f212204 | 8866 | { |
236434c3 MWO |
8867 | struct io_uring_task *tctx = current->io_uring; |
8868 | ||
8869 | if (unlikely(!tctx)) { | |
0f212204 JA |
8870 | int ret; |
8871 | ||
8872 | ret = io_uring_alloc_task_context(current); | |
8873 | if (unlikely(ret)) | |
8874 | return ret; | |
236434c3 | 8875 | tctx = current->io_uring; |
0f212204 | 8876 | } |
236434c3 MWO |
8877 | if (tctx->last != file) { |
8878 | void *old = xa_load(&tctx->xa, (unsigned long)file); | |
0f212204 | 8879 | |
236434c3 | 8880 | if (!old) { |
0f212204 | 8881 | get_file(file); |
236434c3 | 8882 | xa_store(&tctx->xa, (unsigned long)file, file, GFP_KERNEL); |
0f212204 | 8883 | } |
236434c3 | 8884 | tctx->last = file; |
0f212204 JA |
8885 | } |
8886 | ||
fdaf083c JA |
8887 | /* |
8888 | * This is race safe in that the task itself is doing this, hence it | |
8889 | * cannot be going through the exit/cancel paths at the same time. | |
8890 | * This cannot be modified while exit/cancel is running. | |
8891 | */ | |
8892 | if (!tctx->sqpoll && (ctx->flags & IORING_SETUP_SQPOLL)) | |
8893 | tctx->sqpoll = true; | |
8894 | ||
0f212204 JA |
8895 | return 0; |
8896 | } | |
8897 | ||
8898 | /* | |
8899 | * Remove this io_uring_file -> task mapping. | |
8900 | */ | |
8901 | static void io_uring_del_task_file(struct file *file) | |
8902 | { | |
8903 | struct io_uring_task *tctx = current->io_uring; | |
0f212204 JA |
8904 | |
8905 | if (tctx->last == file) | |
8906 | tctx->last = NULL; | |
5e2ed8c4 | 8907 | file = xa_erase(&tctx->xa, (unsigned long)file); |
0f212204 JA |
8908 | if (file) |
8909 | fput(file); | |
8910 | } | |
8911 | ||
0f212204 JA |
8912 | /* |
8913 | * Drop task note for this file if we're the only ones that hold it after | |
8914 | * pending fput() | |
8915 | */ | |
c8fb20b5 | 8916 | static void io_uring_attempt_task_drop(struct file *file) |
0f212204 JA |
8917 | { |
8918 | if (!current->io_uring) | |
8919 | return; | |
8920 | /* | |
8921 | * fput() is pending, will be 2 if the only other ref is our potential | |
8922 | * task file note. If the task is exiting, drop regardless of count. | |
8923 | */ | |
c8fb20b5 PB |
8924 | if (fatal_signal_pending(current) || (current->flags & PF_EXITING) || |
8925 | atomic_long_read(&file->f_count) == 2) | |
8926 | io_uring_del_task_file(file); | |
0f212204 JA |
8927 | } |
8928 | ||
8929 | void __io_uring_files_cancel(struct files_struct *files) | |
8930 | { | |
8931 | struct io_uring_task *tctx = current->io_uring; | |
ce765372 MWO |
8932 | struct file *file; |
8933 | unsigned long index; | |
0f212204 JA |
8934 | |
8935 | /* make sure overflow events are dropped */ | |
fdaf083c | 8936 | atomic_inc(&tctx->in_idle); |
0f212204 | 8937 | |
ce765372 MWO |
8938 | xa_for_each(&tctx->xa, index, file) { |
8939 | struct io_ring_ctx *ctx = file->private_data; | |
0f212204 JA |
8940 | |
8941 | io_uring_cancel_task_requests(ctx, files); | |
8942 | if (files) | |
8943 | io_uring_del_task_file(file); | |
ce765372 | 8944 | } |
fdaf083c JA |
8945 | |
8946 | atomic_dec(&tctx->in_idle); | |
8947 | } | |
8948 | ||
8949 | static s64 tctx_inflight(struct io_uring_task *tctx) | |
8950 | { | |
8951 | unsigned long index; | |
8952 | struct file *file; | |
8953 | s64 inflight; | |
8954 | ||
8955 | inflight = percpu_counter_sum(&tctx->inflight); | |
8956 | if (!tctx->sqpoll) | |
8957 | return inflight; | |
8958 | ||
8959 | /* | |
8960 | * If we have SQPOLL rings, then we need to iterate and find them, and | |
8961 | * add the pending count for those. | |
8962 | */ | |
8963 | xa_for_each(&tctx->xa, index, file) { | |
8964 | struct io_ring_ctx *ctx = file->private_data; | |
8965 | ||
8966 | if (ctx->flags & IORING_SETUP_SQPOLL) { | |
8967 | struct io_uring_task *__tctx = ctx->sqo_task->io_uring; | |
8968 | ||
8969 | inflight += percpu_counter_sum(&__tctx->inflight); | |
8970 | } | |
8971 | } | |
8972 | ||
8973 | return inflight; | |
0f212204 JA |
8974 | } |
8975 | ||
0f212204 JA |
8976 | /* |
8977 | * Find any io_uring fd that this task has registered or done IO on, and cancel | |
8978 | * requests. | |
8979 | */ | |
8980 | void __io_uring_task_cancel(void) | |
8981 | { | |
8982 | struct io_uring_task *tctx = current->io_uring; | |
8983 | DEFINE_WAIT(wait); | |
d8a6df10 | 8984 | s64 inflight; |
0f212204 JA |
8985 | |
8986 | /* make sure overflow events are dropped */ | |
fdaf083c | 8987 | atomic_inc(&tctx->in_idle); |
0f212204 | 8988 | |
d8a6df10 | 8989 | do { |
0f212204 | 8990 | /* read completions before cancelations */ |
fdaf083c | 8991 | inflight = tctx_inflight(tctx); |
d8a6df10 JA |
8992 | if (!inflight) |
8993 | break; | |
0f212204 JA |
8994 | __io_uring_files_cancel(NULL); |
8995 | ||
8996 | prepare_to_wait(&tctx->wait, &wait, TASK_UNINTERRUPTIBLE); | |
8997 | ||
8998 | /* | |
8999 | * If we've seen completions, retry. This avoids a race where | |
9000 | * a completion comes in before we did prepare_to_wait(). | |
9001 | */ | |
fdaf083c | 9002 | if (inflight != tctx_inflight(tctx)) |
0f212204 | 9003 | continue; |
0f212204 | 9004 | schedule(); |
d8a6df10 | 9005 | } while (1); |
0f212204 JA |
9006 | |
9007 | finish_wait(&tctx->wait, &wait); | |
fdaf083c | 9008 | atomic_dec(&tctx->in_idle); |
44e728b8 PB |
9009 | } |
9010 | ||
fcb323cc JA |
9011 | static int io_uring_flush(struct file *file, void *data) |
9012 | { | |
c8fb20b5 | 9013 | io_uring_attempt_task_drop(file); |
fcb323cc JA |
9014 | return 0; |
9015 | } | |
9016 | ||
6c5c240e RP |
9017 | static void *io_uring_validate_mmap_request(struct file *file, |
9018 | loff_t pgoff, size_t sz) | |
2b188cc1 | 9019 | { |
2b188cc1 | 9020 | struct io_ring_ctx *ctx = file->private_data; |
6c5c240e | 9021 | loff_t offset = pgoff << PAGE_SHIFT; |
2b188cc1 JA |
9022 | struct page *page; |
9023 | void *ptr; | |
9024 | ||
9025 | switch (offset) { | |
9026 | case IORING_OFF_SQ_RING: | |
75b28aff HV |
9027 | case IORING_OFF_CQ_RING: |
9028 | ptr = ctx->rings; | |
2b188cc1 JA |
9029 | break; |
9030 | case IORING_OFF_SQES: | |
9031 | ptr = ctx->sq_sqes; | |
9032 | break; | |
2b188cc1 | 9033 | default: |
6c5c240e | 9034 | return ERR_PTR(-EINVAL); |
2b188cc1 JA |
9035 | } |
9036 | ||
9037 | page = virt_to_head_page(ptr); | |
a50b854e | 9038 | if (sz > page_size(page)) |
6c5c240e RP |
9039 | return ERR_PTR(-EINVAL); |
9040 | ||
9041 | return ptr; | |
9042 | } | |
9043 | ||
9044 | #ifdef CONFIG_MMU | |
9045 | ||
9046 | static int io_uring_mmap(struct file *file, struct vm_area_struct *vma) | |
9047 | { | |
9048 | size_t sz = vma->vm_end - vma->vm_start; | |
9049 | unsigned long pfn; | |
9050 | void *ptr; | |
9051 | ||
9052 | ptr = io_uring_validate_mmap_request(file, vma->vm_pgoff, sz); | |
9053 | if (IS_ERR(ptr)) | |
9054 | return PTR_ERR(ptr); | |
2b188cc1 JA |
9055 | |
9056 | pfn = virt_to_phys(ptr) >> PAGE_SHIFT; | |
9057 | return remap_pfn_range(vma, vma->vm_start, pfn, sz, vma->vm_page_prot); | |
9058 | } | |
9059 | ||
6c5c240e RP |
9060 | #else /* !CONFIG_MMU */ |
9061 | ||
9062 | static int io_uring_mmap(struct file *file, struct vm_area_struct *vma) | |
9063 | { | |
9064 | return vma->vm_flags & (VM_SHARED | VM_MAYSHARE) ? 0 : -EINVAL; | |
9065 | } | |
9066 | ||
9067 | static unsigned int io_uring_nommu_mmap_capabilities(struct file *file) | |
9068 | { | |
9069 | return NOMMU_MAP_DIRECT | NOMMU_MAP_READ | NOMMU_MAP_WRITE; | |
9070 | } | |
9071 | ||
9072 | static unsigned long io_uring_nommu_get_unmapped_area(struct file *file, | |
9073 | unsigned long addr, unsigned long len, | |
9074 | unsigned long pgoff, unsigned long flags) | |
9075 | { | |
9076 | void *ptr; | |
9077 | ||
9078 | ptr = io_uring_validate_mmap_request(file, pgoff, len); | |
9079 | if (IS_ERR(ptr)) | |
9080 | return PTR_ERR(ptr); | |
9081 | ||
9082 | return (unsigned long) ptr; | |
9083 | } | |
9084 | ||
9085 | #endif /* !CONFIG_MMU */ | |
9086 | ||
90554200 JA |
9087 | static void io_sqpoll_wait_sq(struct io_ring_ctx *ctx) |
9088 | { | |
9089 | DEFINE_WAIT(wait); | |
9090 | ||
9091 | do { | |
9092 | if (!io_sqring_full(ctx)) | |
9093 | break; | |
9094 | ||
9095 | prepare_to_wait(&ctx->sqo_sq_wait, &wait, TASK_INTERRUPTIBLE); | |
9096 | ||
9097 | if (!io_sqring_full(ctx)) | |
9098 | break; | |
9099 | ||
9100 | schedule(); | |
9101 | } while (!signal_pending(current)); | |
9102 | ||
9103 | finish_wait(&ctx->sqo_sq_wait, &wait); | |
9104 | } | |
9105 | ||
2b188cc1 JA |
9106 | SYSCALL_DEFINE6(io_uring_enter, unsigned int, fd, u32, to_submit, |
9107 | u32, min_complete, u32, flags, const sigset_t __user *, sig, | |
9108 | size_t, sigsz) | |
9109 | { | |
9110 | struct io_ring_ctx *ctx; | |
9111 | long ret = -EBADF; | |
9112 | int submitted = 0; | |
9113 | struct fd f; | |
9114 | ||
4c6e277c | 9115 | io_run_task_work(); |
b41e9852 | 9116 | |
90554200 JA |
9117 | if (flags & ~(IORING_ENTER_GETEVENTS | IORING_ENTER_SQ_WAKEUP | |
9118 | IORING_ENTER_SQ_WAIT)) | |
2b188cc1 JA |
9119 | return -EINVAL; |
9120 | ||
9121 | f = fdget(fd); | |
9122 | if (!f.file) | |
9123 | return -EBADF; | |
9124 | ||
9125 | ret = -EOPNOTSUPP; | |
9126 | if (f.file->f_op != &io_uring_fops) | |
9127 | goto out_fput; | |
9128 | ||
9129 | ret = -ENXIO; | |
9130 | ctx = f.file->private_data; | |
9131 | if (!percpu_ref_tryget(&ctx->refs)) | |
9132 | goto out_fput; | |
9133 | ||
7e84e1c7 SG |
9134 | ret = -EBADFD; |
9135 | if (ctx->flags & IORING_SETUP_R_DISABLED) | |
9136 | goto out; | |
9137 | ||
6c271ce2 JA |
9138 | /* |
9139 | * For SQ polling, the thread will do all submissions and completions. | |
9140 | * Just return the requested submit count, and wake the thread if | |
9141 | * we were asked to. | |
9142 | */ | |
b2a9eada | 9143 | ret = 0; |
6c271ce2 | 9144 | if (ctx->flags & IORING_SETUP_SQPOLL) { |
c1edbf5f | 9145 | if (!list_empty_careful(&ctx->cq_overflow_list)) |
e6c8aa9a | 9146 | io_cqring_overflow_flush(ctx, false, NULL, NULL); |
6c271ce2 | 9147 | if (flags & IORING_ENTER_SQ_WAKEUP) |
534ca6d6 | 9148 | wake_up(&ctx->sq_data->wait); |
90554200 JA |
9149 | if (flags & IORING_ENTER_SQ_WAIT) |
9150 | io_sqpoll_wait_sq(ctx); | |
6c271ce2 | 9151 | submitted = to_submit; |
b2a9eada | 9152 | } else if (to_submit) { |
fdaf083c | 9153 | ret = io_uring_add_task_file(ctx, f.file); |
0f212204 JA |
9154 | if (unlikely(ret)) |
9155 | goto out; | |
2b188cc1 | 9156 | mutex_lock(&ctx->uring_lock); |
0f212204 | 9157 | submitted = io_submit_sqes(ctx, to_submit); |
2b188cc1 | 9158 | mutex_unlock(&ctx->uring_lock); |
7c504e65 PB |
9159 | |
9160 | if (submitted != to_submit) | |
9161 | goto out; | |
2b188cc1 JA |
9162 | } |
9163 | if (flags & IORING_ENTER_GETEVENTS) { | |
9164 | min_complete = min(min_complete, ctx->cq_entries); | |
9165 | ||
32b2244a XW |
9166 | /* |
9167 | * When SETUP_IOPOLL and SETUP_SQPOLL are both enabled, user | |
9168 | * space applications don't need to do io completion events | |
9169 | * polling again, they can rely on io_sq_thread to do polling | |
9170 | * work, which can reduce cpu usage and uring_lock contention. | |
9171 | */ | |
9172 | if (ctx->flags & IORING_SETUP_IOPOLL && | |
9173 | !(ctx->flags & IORING_SETUP_SQPOLL)) { | |
7668b92a | 9174 | ret = io_iopoll_check(ctx, min_complete); |
def596e9 JA |
9175 | } else { |
9176 | ret = io_cqring_wait(ctx, min_complete, sig, sigsz); | |
9177 | } | |
2b188cc1 JA |
9178 | } |
9179 | ||
7c504e65 | 9180 | out: |
6805b32e | 9181 | percpu_ref_put(&ctx->refs); |
2b188cc1 JA |
9182 | out_fput: |
9183 | fdput(f); | |
9184 | return submitted ? submitted : ret; | |
9185 | } | |
9186 | ||
bebdb65e | 9187 | #ifdef CONFIG_PROC_FS |
87ce955b JA |
9188 | static int io_uring_show_cred(int id, void *p, void *data) |
9189 | { | |
6b47ab81 JA |
9190 | struct io_identity *iod = p; |
9191 | const struct cred *cred = iod->creds; | |
87ce955b JA |
9192 | struct seq_file *m = data; |
9193 | struct user_namespace *uns = seq_user_ns(m); | |
9194 | struct group_info *gi; | |
9195 | kernel_cap_t cap; | |
9196 | unsigned __capi; | |
9197 | int g; | |
9198 | ||
9199 | seq_printf(m, "%5d\n", id); | |
9200 | seq_put_decimal_ull(m, "\tUid:\t", from_kuid_munged(uns, cred->uid)); | |
9201 | seq_put_decimal_ull(m, "\t\t", from_kuid_munged(uns, cred->euid)); | |
9202 | seq_put_decimal_ull(m, "\t\t", from_kuid_munged(uns, cred->suid)); | |
9203 | seq_put_decimal_ull(m, "\t\t", from_kuid_munged(uns, cred->fsuid)); | |
9204 | seq_put_decimal_ull(m, "\n\tGid:\t", from_kgid_munged(uns, cred->gid)); | |
9205 | seq_put_decimal_ull(m, "\t\t", from_kgid_munged(uns, cred->egid)); | |
9206 | seq_put_decimal_ull(m, "\t\t", from_kgid_munged(uns, cred->sgid)); | |
9207 | seq_put_decimal_ull(m, "\t\t", from_kgid_munged(uns, cred->fsgid)); | |
9208 | seq_puts(m, "\n\tGroups:\t"); | |
9209 | gi = cred->group_info; | |
9210 | for (g = 0; g < gi->ngroups; g++) { | |
9211 | seq_put_decimal_ull(m, g ? " " : "", | |
9212 | from_kgid_munged(uns, gi->gid[g])); | |
9213 | } | |
9214 | seq_puts(m, "\n\tCapEff:\t"); | |
9215 | cap = cred->cap_effective; | |
9216 | CAP_FOR_EACH_U32(__capi) | |
9217 | seq_put_hex_ll(m, NULL, cap.cap[CAP_LAST_U32 - __capi], 8); | |
9218 | seq_putc(m, '\n'); | |
9219 | return 0; | |
9220 | } | |
9221 | ||
9222 | static void __io_uring_show_fdinfo(struct io_ring_ctx *ctx, struct seq_file *m) | |
9223 | { | |
dbbe9c64 | 9224 | struct io_sq_data *sq = NULL; |
fad8e0de | 9225 | bool has_lock; |
87ce955b JA |
9226 | int i; |
9227 | ||
fad8e0de JA |
9228 | /* |
9229 | * Avoid ABBA deadlock between the seq lock and the io_uring mutex, | |
9230 | * since fdinfo case grabs it in the opposite direction of normal use | |
9231 | * cases. If we fail to get the lock, we just don't iterate any | |
9232 | * structures that could be going away outside the io_uring mutex. | |
9233 | */ | |
9234 | has_lock = mutex_trylock(&ctx->uring_lock); | |
9235 | ||
dbbe9c64 JQ |
9236 | if (has_lock && (ctx->flags & IORING_SETUP_SQPOLL)) |
9237 | sq = ctx->sq_data; | |
9238 | ||
9239 | seq_printf(m, "SqThread:\t%d\n", sq ? task_pid_nr(sq->thread) : -1); | |
9240 | seq_printf(m, "SqThreadCpu:\t%d\n", sq ? task_cpu(sq->thread) : -1); | |
87ce955b | 9241 | seq_printf(m, "UserFiles:\t%u\n", ctx->nr_user_files); |
fad8e0de | 9242 | for (i = 0; has_lock && i < ctx->nr_user_files; i++) { |
87ce955b JA |
9243 | struct fixed_file_table *table; |
9244 | struct file *f; | |
9245 | ||
9246 | table = &ctx->file_data->table[i >> IORING_FILE_TABLE_SHIFT]; | |
9247 | f = table->files[i & IORING_FILE_TABLE_MASK]; | |
9248 | if (f) | |
9249 | seq_printf(m, "%5u: %s\n", i, file_dentry(f)->d_iname); | |
9250 | else | |
9251 | seq_printf(m, "%5u: <none>\n", i); | |
9252 | } | |
9253 | seq_printf(m, "UserBufs:\t%u\n", ctx->nr_user_bufs); | |
fad8e0de | 9254 | for (i = 0; has_lock && i < ctx->nr_user_bufs; i++) { |
87ce955b JA |
9255 | struct io_mapped_ubuf *buf = &ctx->user_bufs[i]; |
9256 | ||
9257 | seq_printf(m, "%5u: 0x%llx/%u\n", i, buf->ubuf, | |
9258 | (unsigned int) buf->len); | |
9259 | } | |
fad8e0de | 9260 | if (has_lock && !idr_is_empty(&ctx->personality_idr)) { |
87ce955b JA |
9261 | seq_printf(m, "Personalities:\n"); |
9262 | idr_for_each(&ctx->personality_idr, io_uring_show_cred, m); | |
9263 | } | |
d7718a9d JA |
9264 | seq_printf(m, "PollList:\n"); |
9265 | spin_lock_irq(&ctx->completion_lock); | |
9266 | for (i = 0; i < (1U << ctx->cancel_hash_bits); i++) { | |
9267 | struct hlist_head *list = &ctx->cancel_hash[i]; | |
9268 | struct io_kiocb *req; | |
9269 | ||
9270 | hlist_for_each_entry(req, list, hash_node) | |
9271 | seq_printf(m, " op=%d, task_works=%d\n", req->opcode, | |
9272 | req->task->task_works != NULL); | |
9273 | } | |
9274 | spin_unlock_irq(&ctx->completion_lock); | |
fad8e0de JA |
9275 | if (has_lock) |
9276 | mutex_unlock(&ctx->uring_lock); | |
87ce955b JA |
9277 | } |
9278 | ||
9279 | static void io_uring_show_fdinfo(struct seq_file *m, struct file *f) | |
9280 | { | |
9281 | struct io_ring_ctx *ctx = f->private_data; | |
9282 | ||
9283 | if (percpu_ref_tryget(&ctx->refs)) { | |
9284 | __io_uring_show_fdinfo(ctx, m); | |
9285 | percpu_ref_put(&ctx->refs); | |
9286 | } | |
9287 | } | |
bebdb65e | 9288 | #endif |
87ce955b | 9289 | |
2b188cc1 JA |
9290 | static const struct file_operations io_uring_fops = { |
9291 | .release = io_uring_release, | |
fcb323cc | 9292 | .flush = io_uring_flush, |
2b188cc1 | 9293 | .mmap = io_uring_mmap, |
6c5c240e RP |
9294 | #ifndef CONFIG_MMU |
9295 | .get_unmapped_area = io_uring_nommu_get_unmapped_area, | |
9296 | .mmap_capabilities = io_uring_nommu_mmap_capabilities, | |
9297 | #endif | |
2b188cc1 JA |
9298 | .poll = io_uring_poll, |
9299 | .fasync = io_uring_fasync, | |
bebdb65e | 9300 | #ifdef CONFIG_PROC_FS |
87ce955b | 9301 | .show_fdinfo = io_uring_show_fdinfo, |
bebdb65e | 9302 | #endif |
2b188cc1 JA |
9303 | }; |
9304 | ||
9305 | static int io_allocate_scq_urings(struct io_ring_ctx *ctx, | |
9306 | struct io_uring_params *p) | |
9307 | { | |
75b28aff HV |
9308 | struct io_rings *rings; |
9309 | size_t size, sq_array_offset; | |
2b188cc1 | 9310 | |
bd740481 JA |
9311 | /* make sure these are sane, as we already accounted them */ |
9312 | ctx->sq_entries = p->sq_entries; | |
9313 | ctx->cq_entries = p->cq_entries; | |
9314 | ||
75b28aff HV |
9315 | size = rings_size(p->sq_entries, p->cq_entries, &sq_array_offset); |
9316 | if (size == SIZE_MAX) | |
9317 | return -EOVERFLOW; | |
9318 | ||
9319 | rings = io_mem_alloc(size); | |
9320 | if (!rings) | |
2b188cc1 JA |
9321 | return -ENOMEM; |
9322 | ||
75b28aff HV |
9323 | ctx->rings = rings; |
9324 | ctx->sq_array = (u32 *)((char *)rings + sq_array_offset); | |
9325 | rings->sq_ring_mask = p->sq_entries - 1; | |
9326 | rings->cq_ring_mask = p->cq_entries - 1; | |
9327 | rings->sq_ring_entries = p->sq_entries; | |
9328 | rings->cq_ring_entries = p->cq_entries; | |
9329 | ctx->sq_mask = rings->sq_ring_mask; | |
9330 | ctx->cq_mask = rings->cq_ring_mask; | |
2b188cc1 JA |
9331 | |
9332 | size = array_size(sizeof(struct io_uring_sqe), p->sq_entries); | |
eb065d30 JA |
9333 | if (size == SIZE_MAX) { |
9334 | io_mem_free(ctx->rings); | |
9335 | ctx->rings = NULL; | |
2b188cc1 | 9336 | return -EOVERFLOW; |
eb065d30 | 9337 | } |
2b188cc1 JA |
9338 | |
9339 | ctx->sq_sqes = io_mem_alloc(size); | |
eb065d30 JA |
9340 | if (!ctx->sq_sqes) { |
9341 | io_mem_free(ctx->rings); | |
9342 | ctx->rings = NULL; | |
2b188cc1 | 9343 | return -ENOMEM; |
eb065d30 | 9344 | } |
2b188cc1 | 9345 | |
2b188cc1 JA |
9346 | return 0; |
9347 | } | |
9348 | ||
9349 | /* | |
9350 | * Allocate an anonymous fd, this is what constitutes the application | |
9351 | * visible backing of an io_uring instance. The application mmaps this | |
9352 | * fd to gain access to the SQ/CQ ring details. If UNIX sockets are enabled, | |
9353 | * we have to tie this fd to a socket for file garbage collection purposes. | |
9354 | */ | |
9355 | static int io_uring_get_fd(struct io_ring_ctx *ctx) | |
9356 | { | |
9357 | struct file *file; | |
9358 | int ret; | |
9359 | ||
9360 | #if defined(CONFIG_UNIX) | |
9361 | ret = sock_create_kern(&init_net, PF_UNIX, SOCK_RAW, IPPROTO_IP, | |
9362 | &ctx->ring_sock); | |
9363 | if (ret) | |
9364 | return ret; | |
9365 | #endif | |
9366 | ||
9367 | ret = get_unused_fd_flags(O_RDWR | O_CLOEXEC); | |
9368 | if (ret < 0) | |
9369 | goto err; | |
9370 | ||
9371 | file = anon_inode_getfile("[io_uring]", &io_uring_fops, ctx, | |
9372 | O_RDWR | O_CLOEXEC); | |
9373 | if (IS_ERR(file)) { | |
0f212204 | 9374 | err_fd: |
2b188cc1 JA |
9375 | put_unused_fd(ret); |
9376 | ret = PTR_ERR(file); | |
9377 | goto err; | |
9378 | } | |
9379 | ||
9380 | #if defined(CONFIG_UNIX) | |
9381 | ctx->ring_sock->file = file; | |
9382 | #endif | |
fdaf083c | 9383 | if (unlikely(io_uring_add_task_file(ctx, file))) { |
0f212204 JA |
9384 | file = ERR_PTR(-ENOMEM); |
9385 | goto err_fd; | |
9386 | } | |
2b188cc1 JA |
9387 | fd_install(ret, file); |
9388 | return ret; | |
9389 | err: | |
9390 | #if defined(CONFIG_UNIX) | |
9391 | sock_release(ctx->ring_sock); | |
9392 | ctx->ring_sock = NULL; | |
9393 | #endif | |
9394 | return ret; | |
9395 | } | |
9396 | ||
7f13657d XW |
9397 | static int io_uring_create(unsigned entries, struct io_uring_params *p, |
9398 | struct io_uring_params __user *params) | |
2b188cc1 JA |
9399 | { |
9400 | struct user_struct *user = NULL; | |
9401 | struct io_ring_ctx *ctx; | |
aad5d8da | 9402 | bool limit_mem; |
2b188cc1 JA |
9403 | int ret; |
9404 | ||
8110c1a6 | 9405 | if (!entries) |
2b188cc1 | 9406 | return -EINVAL; |
8110c1a6 JA |
9407 | if (entries > IORING_MAX_ENTRIES) { |
9408 | if (!(p->flags & IORING_SETUP_CLAMP)) | |
9409 | return -EINVAL; | |
9410 | entries = IORING_MAX_ENTRIES; | |
9411 | } | |
2b188cc1 JA |
9412 | |
9413 | /* | |
9414 | * Use twice as many entries for the CQ ring. It's possible for the | |
9415 | * application to drive a higher depth than the size of the SQ ring, | |
9416 | * since the sqes are only used at submission time. This allows for | |
33a107f0 JA |
9417 | * some flexibility in overcommitting a bit. If the application has |
9418 | * set IORING_SETUP_CQSIZE, it will have passed in the desired number | |
9419 | * of CQ ring entries manually. | |
2b188cc1 JA |
9420 | */ |
9421 | p->sq_entries = roundup_pow_of_two(entries); | |
33a107f0 JA |
9422 | if (p->flags & IORING_SETUP_CQSIZE) { |
9423 | /* | |
9424 | * If IORING_SETUP_CQSIZE is set, we do the same roundup | |
9425 | * to a power-of-two, if it isn't already. We do NOT impose | |
9426 | * any cq vs sq ring sizing. | |
9427 | */ | |
88ec3211 | 9428 | p->cq_entries = roundup_pow_of_two(p->cq_entries); |
8110c1a6 | 9429 | if (p->cq_entries < p->sq_entries) |
33a107f0 | 9430 | return -EINVAL; |
8110c1a6 JA |
9431 | if (p->cq_entries > IORING_MAX_CQ_ENTRIES) { |
9432 | if (!(p->flags & IORING_SETUP_CLAMP)) | |
9433 | return -EINVAL; | |
9434 | p->cq_entries = IORING_MAX_CQ_ENTRIES; | |
9435 | } | |
33a107f0 JA |
9436 | } else { |
9437 | p->cq_entries = 2 * p->sq_entries; | |
9438 | } | |
2b188cc1 JA |
9439 | |
9440 | user = get_uid(current_user()); | |
aad5d8da | 9441 | limit_mem = !capable(CAP_IPC_LOCK); |
2b188cc1 | 9442 | |
aad5d8da | 9443 | if (limit_mem) { |
a087e2b5 | 9444 | ret = __io_account_mem(user, |
2b188cc1 JA |
9445 | ring_pages(p->sq_entries, p->cq_entries)); |
9446 | if (ret) { | |
9447 | free_uid(user); | |
9448 | return ret; | |
9449 | } | |
9450 | } | |
9451 | ||
9452 | ctx = io_ring_ctx_alloc(p); | |
9453 | if (!ctx) { | |
aad5d8da | 9454 | if (limit_mem) |
a087e2b5 | 9455 | __io_unaccount_mem(user, ring_pages(p->sq_entries, |
2b188cc1 JA |
9456 | p->cq_entries)); |
9457 | free_uid(user); | |
9458 | return -ENOMEM; | |
9459 | } | |
9460 | ctx->compat = in_compat_syscall(); | |
2b188cc1 | 9461 | ctx->user = user; |
0b8c0ec7 | 9462 | ctx->creds = get_current_cred(); |
4ea33a97 JA |
9463 | #ifdef CONFIG_AUDIT |
9464 | ctx->loginuid = current->loginuid; | |
9465 | ctx->sessionid = current->sessionid; | |
9466 | #endif | |
2aede0e4 JA |
9467 | ctx->sqo_task = get_task_struct(current); |
9468 | ||
9469 | /* | |
9470 | * This is just grabbed for accounting purposes. When a process exits, | |
9471 | * the mm is exited and dropped before the files, hence we need to hang | |
9472 | * on to this mm purely for the purposes of being able to unaccount | |
9473 | * memory (locked/pinned vm). It's not used for anything else. | |
9474 | */ | |
6b7898eb | 9475 | mmgrab(current->mm); |
2aede0e4 | 9476 | ctx->mm_account = current->mm; |
6b7898eb | 9477 | |
91d8f519 DZ |
9478 | #ifdef CONFIG_BLK_CGROUP |
9479 | /* | |
9480 | * The sq thread will belong to the original cgroup it was inited in. | |
9481 | * If the cgroup goes offline (e.g. disabling the io controller), then | |
9482 | * issued bios will be associated with the closest cgroup later in the | |
9483 | * block layer. | |
9484 | */ | |
9485 | rcu_read_lock(); | |
9486 | ctx->sqo_blkcg_css = blkcg_css(); | |
9487 | ret = css_tryget_online(ctx->sqo_blkcg_css); | |
9488 | rcu_read_unlock(); | |
9489 | if (!ret) { | |
9490 | /* don't init against a dying cgroup, have the user try again */ | |
9491 | ctx->sqo_blkcg_css = NULL; | |
9492 | ret = -ENODEV; | |
9493 | goto err; | |
9494 | } | |
9495 | #endif | |
6b7898eb | 9496 | |
f74441e6 JA |
9497 | /* |
9498 | * Account memory _before_ installing the file descriptor. Once | |
9499 | * the descriptor is installed, it can get closed at any time. Also | |
9500 | * do this before hitting the general error path, as ring freeing | |
9501 | * will un-account as well. | |
9502 | */ | |
9503 | io_account_mem(ctx, ring_pages(p->sq_entries, p->cq_entries), | |
9504 | ACCT_LOCKED); | |
9505 | ctx->limit_mem = limit_mem; | |
9506 | ||
2b188cc1 JA |
9507 | ret = io_allocate_scq_urings(ctx, p); |
9508 | if (ret) | |
9509 | goto err; | |
9510 | ||
7e84e1c7 | 9511 | ret = io_sq_offload_create(ctx, p); |
2b188cc1 JA |
9512 | if (ret) |
9513 | goto err; | |
9514 | ||
7e84e1c7 SG |
9515 | if (!(p->flags & IORING_SETUP_R_DISABLED)) |
9516 | io_sq_offload_start(ctx); | |
9517 | ||
2b188cc1 | 9518 | memset(&p->sq_off, 0, sizeof(p->sq_off)); |
75b28aff HV |
9519 | p->sq_off.head = offsetof(struct io_rings, sq.head); |
9520 | p->sq_off.tail = offsetof(struct io_rings, sq.tail); | |
9521 | p->sq_off.ring_mask = offsetof(struct io_rings, sq_ring_mask); | |
9522 | p->sq_off.ring_entries = offsetof(struct io_rings, sq_ring_entries); | |
9523 | p->sq_off.flags = offsetof(struct io_rings, sq_flags); | |
9524 | p->sq_off.dropped = offsetof(struct io_rings, sq_dropped); | |
9525 | p->sq_off.array = (char *)ctx->sq_array - (char *)ctx->rings; | |
2b188cc1 JA |
9526 | |
9527 | memset(&p->cq_off, 0, sizeof(p->cq_off)); | |
75b28aff HV |
9528 | p->cq_off.head = offsetof(struct io_rings, cq.head); |
9529 | p->cq_off.tail = offsetof(struct io_rings, cq.tail); | |
9530 | p->cq_off.ring_mask = offsetof(struct io_rings, cq_ring_mask); | |
9531 | p->cq_off.ring_entries = offsetof(struct io_rings, cq_ring_entries); | |
9532 | p->cq_off.overflow = offsetof(struct io_rings, cq_overflow); | |
9533 | p->cq_off.cqes = offsetof(struct io_rings, cqes); | |
0d9b5b3a | 9534 | p->cq_off.flags = offsetof(struct io_rings, cq_flags); |
ac90f249 | 9535 | |
7f13657d XW |
9536 | p->features = IORING_FEAT_SINGLE_MMAP | IORING_FEAT_NODROP | |
9537 | IORING_FEAT_SUBMIT_STABLE | IORING_FEAT_RW_CUR_POS | | |
5769a351 | 9538 | IORING_FEAT_CUR_PERSONALITY | IORING_FEAT_FAST_POLL | |
28cea78a | 9539 | IORING_FEAT_POLL_32BITS | IORING_FEAT_SQPOLL_NONFIXED; |
7f13657d XW |
9540 | |
9541 | if (copy_to_user(params, p, sizeof(*p))) { | |
9542 | ret = -EFAULT; | |
9543 | goto err; | |
9544 | } | |
d1719f70 | 9545 | |
044c1ab3 JA |
9546 | /* |
9547 | * Install ring fd as the very last thing, so we don't risk someone | |
9548 | * having closed it before we finish setup | |
9549 | */ | |
9550 | ret = io_uring_get_fd(ctx); | |
9551 | if (ret < 0) | |
9552 | goto err; | |
9553 | ||
c826bd7a | 9554 | trace_io_uring_create(ret, ctx, p->sq_entries, p->cq_entries, p->flags); |
2b188cc1 JA |
9555 | return ret; |
9556 | err: | |
9557 | io_ring_ctx_wait_and_kill(ctx); | |
9558 | return ret; | |
9559 | } | |
9560 | ||
9561 | /* | |
9562 | * Sets up an aio uring context, and returns the fd. Applications asks for a | |
9563 | * ring size, we return the actual sq/cq ring sizes (among other things) in the | |
9564 | * params structure passed in. | |
9565 | */ | |
9566 | static long io_uring_setup(u32 entries, struct io_uring_params __user *params) | |
9567 | { | |
9568 | struct io_uring_params p; | |
2b188cc1 JA |
9569 | int i; |
9570 | ||
9571 | if (copy_from_user(&p, params, sizeof(p))) | |
9572 | return -EFAULT; | |
9573 | for (i = 0; i < ARRAY_SIZE(p.resv); i++) { | |
9574 | if (p.resv[i]) | |
9575 | return -EINVAL; | |
9576 | } | |
9577 | ||
6c271ce2 | 9578 | if (p.flags & ~(IORING_SETUP_IOPOLL | IORING_SETUP_SQPOLL | |
8110c1a6 | 9579 | IORING_SETUP_SQ_AFF | IORING_SETUP_CQSIZE | |
7e84e1c7 SG |
9580 | IORING_SETUP_CLAMP | IORING_SETUP_ATTACH_WQ | |
9581 | IORING_SETUP_R_DISABLED)) | |
2b188cc1 JA |
9582 | return -EINVAL; |
9583 | ||
7f13657d | 9584 | return io_uring_create(entries, &p, params); |
2b188cc1 JA |
9585 | } |
9586 | ||
9587 | SYSCALL_DEFINE2(io_uring_setup, u32, entries, | |
9588 | struct io_uring_params __user *, params) | |
9589 | { | |
9590 | return io_uring_setup(entries, params); | |
9591 | } | |
9592 | ||
66f4af93 JA |
9593 | static int io_probe(struct io_ring_ctx *ctx, void __user *arg, unsigned nr_args) |
9594 | { | |
9595 | struct io_uring_probe *p; | |
9596 | size_t size; | |
9597 | int i, ret; | |
9598 | ||
9599 | size = struct_size(p, ops, nr_args); | |
9600 | if (size == SIZE_MAX) | |
9601 | return -EOVERFLOW; | |
9602 | p = kzalloc(size, GFP_KERNEL); | |
9603 | if (!p) | |
9604 | return -ENOMEM; | |
9605 | ||
9606 | ret = -EFAULT; | |
9607 | if (copy_from_user(p, arg, size)) | |
9608 | goto out; | |
9609 | ret = -EINVAL; | |
9610 | if (memchr_inv(p, 0, size)) | |
9611 | goto out; | |
9612 | ||
9613 | p->last_op = IORING_OP_LAST - 1; | |
9614 | if (nr_args > IORING_OP_LAST) | |
9615 | nr_args = IORING_OP_LAST; | |
9616 | ||
9617 | for (i = 0; i < nr_args; i++) { | |
9618 | p->ops[i].op = i; | |
9619 | if (!io_op_defs[i].not_supported) | |
9620 | p->ops[i].flags = IO_URING_OP_SUPPORTED; | |
9621 | } | |
9622 | p->ops_len = i; | |
9623 | ||
9624 | ret = 0; | |
9625 | if (copy_to_user(arg, p, size)) | |
9626 | ret = -EFAULT; | |
9627 | out: | |
9628 | kfree(p); | |
9629 | return ret; | |
9630 | } | |
9631 | ||
071698e1 JA |
9632 | static int io_register_personality(struct io_ring_ctx *ctx) |
9633 | { | |
1e6fa521 JA |
9634 | struct io_identity *id; |
9635 | int ret; | |
071698e1 | 9636 | |
1e6fa521 JA |
9637 | id = kmalloc(sizeof(*id), GFP_KERNEL); |
9638 | if (unlikely(!id)) | |
9639 | return -ENOMEM; | |
9640 | ||
9641 | io_init_identity(id); | |
9642 | id->creds = get_current_cred(); | |
9643 | ||
9644 | ret = idr_alloc_cyclic(&ctx->personality_idr, id, 1, USHRT_MAX, GFP_KERNEL); | |
9645 | if (ret < 0) { | |
9646 | put_cred(id->creds); | |
9647 | kfree(id); | |
9648 | } | |
9649 | return ret; | |
071698e1 JA |
9650 | } |
9651 | ||
9652 | static int io_unregister_personality(struct io_ring_ctx *ctx, unsigned id) | |
9653 | { | |
1e6fa521 | 9654 | struct io_identity *iod; |
071698e1 | 9655 | |
1e6fa521 JA |
9656 | iod = idr_remove(&ctx->personality_idr, id); |
9657 | if (iod) { | |
9658 | put_cred(iod->creds); | |
9659 | if (refcount_dec_and_test(&iod->count)) | |
9660 | kfree(iod); | |
071698e1 JA |
9661 | return 0; |
9662 | } | |
9663 | ||
9664 | return -EINVAL; | |
9665 | } | |
9666 | ||
21b55dbc SG |
9667 | static int io_register_restrictions(struct io_ring_ctx *ctx, void __user *arg, |
9668 | unsigned int nr_args) | |
9669 | { | |
9670 | struct io_uring_restriction *res; | |
9671 | size_t size; | |
9672 | int i, ret; | |
9673 | ||
7e84e1c7 SG |
9674 | /* Restrictions allowed only if rings started disabled */ |
9675 | if (!(ctx->flags & IORING_SETUP_R_DISABLED)) | |
9676 | return -EBADFD; | |
9677 | ||
21b55dbc | 9678 | /* We allow only a single restrictions registration */ |
7e84e1c7 | 9679 | if (ctx->restrictions.registered) |
21b55dbc SG |
9680 | return -EBUSY; |
9681 | ||
9682 | if (!arg || nr_args > IORING_MAX_RESTRICTIONS) | |
9683 | return -EINVAL; | |
9684 | ||
9685 | size = array_size(nr_args, sizeof(*res)); | |
9686 | if (size == SIZE_MAX) | |
9687 | return -EOVERFLOW; | |
9688 | ||
9689 | res = memdup_user(arg, size); | |
9690 | if (IS_ERR(res)) | |
9691 | return PTR_ERR(res); | |
9692 | ||
9693 | ret = 0; | |
9694 | ||
9695 | for (i = 0; i < nr_args; i++) { | |
9696 | switch (res[i].opcode) { | |
9697 | case IORING_RESTRICTION_REGISTER_OP: | |
9698 | if (res[i].register_op >= IORING_REGISTER_LAST) { | |
9699 | ret = -EINVAL; | |
9700 | goto out; | |
9701 | } | |
9702 | ||
9703 | __set_bit(res[i].register_op, | |
9704 | ctx->restrictions.register_op); | |
9705 | break; | |
9706 | case IORING_RESTRICTION_SQE_OP: | |
9707 | if (res[i].sqe_op >= IORING_OP_LAST) { | |
9708 | ret = -EINVAL; | |
9709 | goto out; | |
9710 | } | |
9711 | ||
9712 | __set_bit(res[i].sqe_op, ctx->restrictions.sqe_op); | |
9713 | break; | |
9714 | case IORING_RESTRICTION_SQE_FLAGS_ALLOWED: | |
9715 | ctx->restrictions.sqe_flags_allowed = res[i].sqe_flags; | |
9716 | break; | |
9717 | case IORING_RESTRICTION_SQE_FLAGS_REQUIRED: | |
9718 | ctx->restrictions.sqe_flags_required = res[i].sqe_flags; | |
9719 | break; | |
9720 | default: | |
9721 | ret = -EINVAL; | |
9722 | goto out; | |
9723 | } | |
9724 | } | |
9725 | ||
9726 | out: | |
9727 | /* Reset all restrictions if an error happened */ | |
9728 | if (ret != 0) | |
9729 | memset(&ctx->restrictions, 0, sizeof(ctx->restrictions)); | |
9730 | else | |
7e84e1c7 | 9731 | ctx->restrictions.registered = true; |
21b55dbc SG |
9732 | |
9733 | kfree(res); | |
9734 | return ret; | |
9735 | } | |
9736 | ||
7e84e1c7 SG |
9737 | static int io_register_enable_rings(struct io_ring_ctx *ctx) |
9738 | { | |
9739 | if (!(ctx->flags & IORING_SETUP_R_DISABLED)) | |
9740 | return -EBADFD; | |
9741 | ||
9742 | if (ctx->restrictions.registered) | |
9743 | ctx->restricted = 1; | |
9744 | ||
9745 | ctx->flags &= ~IORING_SETUP_R_DISABLED; | |
9746 | ||
9747 | io_sq_offload_start(ctx); | |
9748 | ||
9749 | return 0; | |
9750 | } | |
9751 | ||
071698e1 JA |
9752 | static bool io_register_op_must_quiesce(int op) |
9753 | { | |
9754 | switch (op) { | |
9755 | case IORING_UNREGISTER_FILES: | |
9756 | case IORING_REGISTER_FILES_UPDATE: | |
9757 | case IORING_REGISTER_PROBE: | |
9758 | case IORING_REGISTER_PERSONALITY: | |
9759 | case IORING_UNREGISTER_PERSONALITY: | |
9760 | return false; | |
9761 | default: | |
9762 | return true; | |
9763 | } | |
9764 | } | |
9765 | ||
edafccee JA |
9766 | static int __io_uring_register(struct io_ring_ctx *ctx, unsigned opcode, |
9767 | void __user *arg, unsigned nr_args) | |
b19062a5 JA |
9768 | __releases(ctx->uring_lock) |
9769 | __acquires(ctx->uring_lock) | |
edafccee JA |
9770 | { |
9771 | int ret; | |
9772 | ||
35fa71a0 JA |
9773 | /* |
9774 | * We're inside the ring mutex, if the ref is already dying, then | |
9775 | * someone else killed the ctx or is already going through | |
9776 | * io_uring_register(). | |
9777 | */ | |
9778 | if (percpu_ref_is_dying(&ctx->refs)) | |
9779 | return -ENXIO; | |
9780 | ||
071698e1 | 9781 | if (io_register_op_must_quiesce(opcode)) { |
05f3fb3c | 9782 | percpu_ref_kill(&ctx->refs); |
b19062a5 | 9783 | |
05f3fb3c JA |
9784 | /* |
9785 | * Drop uring mutex before waiting for references to exit. If | |
9786 | * another thread is currently inside io_uring_enter() it might | |
9787 | * need to grab the uring_lock to make progress. If we hold it | |
9788 | * here across the drain wait, then we can deadlock. It's safe | |
9789 | * to drop the mutex here, since no new references will come in | |
9790 | * after we've killed the percpu ref. | |
9791 | */ | |
9792 | mutex_unlock(&ctx->uring_lock); | |
af9c1a44 JA |
9793 | do { |
9794 | ret = wait_for_completion_interruptible(&ctx->ref_comp); | |
9795 | if (!ret) | |
9796 | break; | |
ed6930c9 JA |
9797 | ret = io_run_task_work_sig(); |
9798 | if (ret < 0) | |
9799 | break; | |
af9c1a44 JA |
9800 | } while (1); |
9801 | ||
05f3fb3c | 9802 | mutex_lock(&ctx->uring_lock); |
af9c1a44 | 9803 | |
c150368b JA |
9804 | if (ret) { |
9805 | percpu_ref_resurrect(&ctx->refs); | |
21b55dbc SG |
9806 | goto out_quiesce; |
9807 | } | |
9808 | } | |
9809 | ||
9810 | if (ctx->restricted) { | |
9811 | if (opcode >= IORING_REGISTER_LAST) { | |
9812 | ret = -EINVAL; | |
9813 | goto out; | |
9814 | } | |
9815 | ||
9816 | if (!test_bit(opcode, ctx->restrictions.register_op)) { | |
9817 | ret = -EACCES; | |
c150368b JA |
9818 | goto out; |
9819 | } | |
05f3fb3c | 9820 | } |
edafccee JA |
9821 | |
9822 | switch (opcode) { | |
9823 | case IORING_REGISTER_BUFFERS: | |
9824 | ret = io_sqe_buffer_register(ctx, arg, nr_args); | |
9825 | break; | |
9826 | case IORING_UNREGISTER_BUFFERS: | |
9827 | ret = -EINVAL; | |
9828 | if (arg || nr_args) | |
9829 | break; | |
9830 | ret = io_sqe_buffer_unregister(ctx); | |
9831 | break; | |
6b06314c JA |
9832 | case IORING_REGISTER_FILES: |
9833 | ret = io_sqe_files_register(ctx, arg, nr_args); | |
9834 | break; | |
9835 | case IORING_UNREGISTER_FILES: | |
9836 | ret = -EINVAL; | |
9837 | if (arg || nr_args) | |
9838 | break; | |
9839 | ret = io_sqe_files_unregister(ctx); | |
9840 | break; | |
c3a31e60 JA |
9841 | case IORING_REGISTER_FILES_UPDATE: |
9842 | ret = io_sqe_files_update(ctx, arg, nr_args); | |
9843 | break; | |
9b402849 | 9844 | case IORING_REGISTER_EVENTFD: |
f2842ab5 | 9845 | case IORING_REGISTER_EVENTFD_ASYNC: |
9b402849 JA |
9846 | ret = -EINVAL; |
9847 | if (nr_args != 1) | |
9848 | break; | |
9849 | ret = io_eventfd_register(ctx, arg); | |
f2842ab5 JA |
9850 | if (ret) |
9851 | break; | |
9852 | if (opcode == IORING_REGISTER_EVENTFD_ASYNC) | |
9853 | ctx->eventfd_async = 1; | |
9854 | else | |
9855 | ctx->eventfd_async = 0; | |
9b402849 JA |
9856 | break; |
9857 | case IORING_UNREGISTER_EVENTFD: | |
9858 | ret = -EINVAL; | |
9859 | if (arg || nr_args) | |
9860 | break; | |
9861 | ret = io_eventfd_unregister(ctx); | |
9862 | break; | |
66f4af93 JA |
9863 | case IORING_REGISTER_PROBE: |
9864 | ret = -EINVAL; | |
9865 | if (!arg || nr_args > 256) | |
9866 | break; | |
9867 | ret = io_probe(ctx, arg, nr_args); | |
9868 | break; | |
071698e1 JA |
9869 | case IORING_REGISTER_PERSONALITY: |
9870 | ret = -EINVAL; | |
9871 | if (arg || nr_args) | |
9872 | break; | |
9873 | ret = io_register_personality(ctx); | |
9874 | break; | |
9875 | case IORING_UNREGISTER_PERSONALITY: | |
9876 | ret = -EINVAL; | |
9877 | if (arg) | |
9878 | break; | |
9879 | ret = io_unregister_personality(ctx, nr_args); | |
9880 | break; | |
7e84e1c7 SG |
9881 | case IORING_REGISTER_ENABLE_RINGS: |
9882 | ret = -EINVAL; | |
9883 | if (arg || nr_args) | |
9884 | break; | |
9885 | ret = io_register_enable_rings(ctx); | |
9886 | break; | |
21b55dbc SG |
9887 | case IORING_REGISTER_RESTRICTIONS: |
9888 | ret = io_register_restrictions(ctx, arg, nr_args); | |
9889 | break; | |
edafccee JA |
9890 | default: |
9891 | ret = -EINVAL; | |
9892 | break; | |
9893 | } | |
9894 | ||
21b55dbc | 9895 | out: |
071698e1 | 9896 | if (io_register_op_must_quiesce(opcode)) { |
05f3fb3c | 9897 | /* bring the ctx back to life */ |
05f3fb3c | 9898 | percpu_ref_reinit(&ctx->refs); |
21b55dbc | 9899 | out_quiesce: |
0f158b4c | 9900 | reinit_completion(&ctx->ref_comp); |
05f3fb3c | 9901 | } |
edafccee JA |
9902 | return ret; |
9903 | } | |
9904 | ||
9905 | SYSCALL_DEFINE4(io_uring_register, unsigned int, fd, unsigned int, opcode, | |
9906 | void __user *, arg, unsigned int, nr_args) | |
9907 | { | |
9908 | struct io_ring_ctx *ctx; | |
9909 | long ret = -EBADF; | |
9910 | struct fd f; | |
9911 | ||
9912 | f = fdget(fd); | |
9913 | if (!f.file) | |
9914 | return -EBADF; | |
9915 | ||
9916 | ret = -EOPNOTSUPP; | |
9917 | if (f.file->f_op != &io_uring_fops) | |
9918 | goto out_fput; | |
9919 | ||
9920 | ctx = f.file->private_data; | |
9921 | ||
9922 | mutex_lock(&ctx->uring_lock); | |
9923 | ret = __io_uring_register(ctx, opcode, arg, nr_args); | |
9924 | mutex_unlock(&ctx->uring_lock); | |
c826bd7a DD |
9925 | trace_io_uring_register(ctx, opcode, ctx->nr_user_files, ctx->nr_user_bufs, |
9926 | ctx->cq_ev_fd != NULL, ret); | |
edafccee JA |
9927 | out_fput: |
9928 | fdput(f); | |
9929 | return ret; | |
9930 | } | |
9931 | ||
2b188cc1 JA |
9932 | static int __init io_uring_init(void) |
9933 | { | |
d7f62e82 SM |
9934 | #define __BUILD_BUG_VERIFY_ELEMENT(stype, eoffset, etype, ename) do { \ |
9935 | BUILD_BUG_ON(offsetof(stype, ename) != eoffset); \ | |
9936 | BUILD_BUG_ON(sizeof(etype) != sizeof_field(stype, ename)); \ | |
9937 | } while (0) | |
9938 | ||
9939 | #define BUILD_BUG_SQE_ELEM(eoffset, etype, ename) \ | |
9940 | __BUILD_BUG_VERIFY_ELEMENT(struct io_uring_sqe, eoffset, etype, ename) | |
9941 | BUILD_BUG_ON(sizeof(struct io_uring_sqe) != 64); | |
9942 | BUILD_BUG_SQE_ELEM(0, __u8, opcode); | |
9943 | BUILD_BUG_SQE_ELEM(1, __u8, flags); | |
9944 | BUILD_BUG_SQE_ELEM(2, __u16, ioprio); | |
9945 | BUILD_BUG_SQE_ELEM(4, __s32, fd); | |
9946 | BUILD_BUG_SQE_ELEM(8, __u64, off); | |
9947 | BUILD_BUG_SQE_ELEM(8, __u64, addr2); | |
9948 | BUILD_BUG_SQE_ELEM(16, __u64, addr); | |
7d67af2c | 9949 | BUILD_BUG_SQE_ELEM(16, __u64, splice_off_in); |
d7f62e82 SM |
9950 | BUILD_BUG_SQE_ELEM(24, __u32, len); |
9951 | BUILD_BUG_SQE_ELEM(28, __kernel_rwf_t, rw_flags); | |
9952 | BUILD_BUG_SQE_ELEM(28, /* compat */ int, rw_flags); | |
9953 | BUILD_BUG_SQE_ELEM(28, /* compat */ __u32, rw_flags); | |
9954 | BUILD_BUG_SQE_ELEM(28, __u32, fsync_flags); | |
5769a351 JX |
9955 | BUILD_BUG_SQE_ELEM(28, /* compat */ __u16, poll_events); |
9956 | BUILD_BUG_SQE_ELEM(28, __u32, poll32_events); | |
d7f62e82 SM |
9957 | BUILD_BUG_SQE_ELEM(28, __u32, sync_range_flags); |
9958 | BUILD_BUG_SQE_ELEM(28, __u32, msg_flags); | |
9959 | BUILD_BUG_SQE_ELEM(28, __u32, timeout_flags); | |
9960 | BUILD_BUG_SQE_ELEM(28, __u32, accept_flags); | |
9961 | BUILD_BUG_SQE_ELEM(28, __u32, cancel_flags); | |
9962 | BUILD_BUG_SQE_ELEM(28, __u32, open_flags); | |
9963 | BUILD_BUG_SQE_ELEM(28, __u32, statx_flags); | |
9964 | BUILD_BUG_SQE_ELEM(28, __u32, fadvise_advice); | |
7d67af2c | 9965 | BUILD_BUG_SQE_ELEM(28, __u32, splice_flags); |
d7f62e82 SM |
9966 | BUILD_BUG_SQE_ELEM(32, __u64, user_data); |
9967 | BUILD_BUG_SQE_ELEM(40, __u16, buf_index); | |
9968 | BUILD_BUG_SQE_ELEM(42, __u16, personality); | |
7d67af2c | 9969 | BUILD_BUG_SQE_ELEM(44, __s32, splice_fd_in); |
d7f62e82 | 9970 | |
d3656344 | 9971 | BUILD_BUG_ON(ARRAY_SIZE(io_op_defs) != IORING_OP_LAST); |
84557871 | 9972 | BUILD_BUG_ON(__REQ_F_LAST_BIT >= 8 * sizeof(int)); |
2b188cc1 JA |
9973 | req_cachep = KMEM_CACHE(io_kiocb, SLAB_HWCACHE_ALIGN | SLAB_PANIC); |
9974 | return 0; | |
9975 | }; | |
9976 | __initcall(io_uring_init); |