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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 | ||
14a1143b JA |
558 | struct io_unlink { |
559 | struct file *file; | |
560 | int dfd; | |
561 | int flags; | |
562 | struct filename *filename; | |
563 | }; | |
564 | ||
3ca405eb PB |
565 | struct io_completion { |
566 | struct file *file; | |
567 | struct list_head list; | |
0f7e466b | 568 | int cflags; |
3ca405eb PB |
569 | }; |
570 | ||
f499a021 JA |
571 | struct io_async_connect { |
572 | struct sockaddr_storage address; | |
573 | }; | |
574 | ||
03b1230c JA |
575 | struct io_async_msghdr { |
576 | struct iovec fast_iov[UIO_FASTIOV]; | |
577 | struct iovec *iov; | |
578 | struct sockaddr __user *uaddr; | |
579 | struct msghdr msg; | |
b537916c | 580 | struct sockaddr_storage addr; |
03b1230c JA |
581 | }; |
582 | ||
f67676d1 JA |
583 | struct io_async_rw { |
584 | struct iovec fast_iov[UIO_FASTIOV]; | |
ff6165b2 JA |
585 | const struct iovec *free_iovec; |
586 | struct iov_iter iter; | |
227c0c96 | 587 | size_t bytes_done; |
bcf5a063 | 588 | struct wait_page_queue wpq; |
f67676d1 JA |
589 | }; |
590 | ||
6b47ee6e PB |
591 | enum { |
592 | REQ_F_FIXED_FILE_BIT = IOSQE_FIXED_FILE_BIT, | |
593 | REQ_F_IO_DRAIN_BIT = IOSQE_IO_DRAIN_BIT, | |
594 | REQ_F_LINK_BIT = IOSQE_IO_LINK_BIT, | |
595 | REQ_F_HARDLINK_BIT = IOSQE_IO_HARDLINK_BIT, | |
596 | REQ_F_FORCE_ASYNC_BIT = IOSQE_ASYNC_BIT, | |
bcda7baa | 597 | REQ_F_BUFFER_SELECT_BIT = IOSQE_BUFFER_SELECT_BIT, |
6b47ee6e | 598 | |
dea3b49c | 599 | REQ_F_LINK_HEAD_BIT, |
6b47ee6e PB |
600 | REQ_F_FAIL_LINK_BIT, |
601 | REQ_F_INFLIGHT_BIT, | |
602 | REQ_F_CUR_POS_BIT, | |
603 | REQ_F_NOWAIT_BIT, | |
6b47ee6e | 604 | REQ_F_LINK_TIMEOUT_BIT, |
6b47ee6e | 605 | REQ_F_ISREG_BIT, |
99bc4c38 | 606 | REQ_F_NEED_CLEANUP_BIT, |
d7718a9d | 607 | REQ_F_POLLED_BIT, |
bcda7baa | 608 | REQ_F_BUFFER_SELECTED_BIT, |
5b0bbee4 | 609 | REQ_F_NO_FILE_TABLE_BIT, |
7cdaf587 | 610 | REQ_F_WORK_INITIALIZED_BIT, |
900fad45 | 611 | REQ_F_LTIMEOUT_ACTIVE_BIT, |
84557871 JA |
612 | |
613 | /* not a real bit, just to check we're not overflowing the space */ | |
614 | __REQ_F_LAST_BIT, | |
6b47ee6e PB |
615 | }; |
616 | ||
617 | enum { | |
618 | /* ctx owns file */ | |
619 | REQ_F_FIXED_FILE = BIT(REQ_F_FIXED_FILE_BIT), | |
620 | /* drain existing IO first */ | |
621 | REQ_F_IO_DRAIN = BIT(REQ_F_IO_DRAIN_BIT), | |
622 | /* linked sqes */ | |
623 | REQ_F_LINK = BIT(REQ_F_LINK_BIT), | |
624 | /* doesn't sever on completion < 0 */ | |
625 | REQ_F_HARDLINK = BIT(REQ_F_HARDLINK_BIT), | |
626 | /* IOSQE_ASYNC */ | |
627 | REQ_F_FORCE_ASYNC = BIT(REQ_F_FORCE_ASYNC_BIT), | |
bcda7baa JA |
628 | /* IOSQE_BUFFER_SELECT */ |
629 | REQ_F_BUFFER_SELECT = BIT(REQ_F_BUFFER_SELECT_BIT), | |
6b47ee6e | 630 | |
dea3b49c PB |
631 | /* head of a link */ |
632 | REQ_F_LINK_HEAD = BIT(REQ_F_LINK_HEAD_BIT), | |
6b47ee6e PB |
633 | /* fail rest of links */ |
634 | REQ_F_FAIL_LINK = BIT(REQ_F_FAIL_LINK_BIT), | |
635 | /* on inflight list */ | |
636 | REQ_F_INFLIGHT = BIT(REQ_F_INFLIGHT_BIT), | |
637 | /* read/write uses file position */ | |
638 | REQ_F_CUR_POS = BIT(REQ_F_CUR_POS_BIT), | |
639 | /* must not punt to workers */ | |
640 | REQ_F_NOWAIT = BIT(REQ_F_NOWAIT_BIT), | |
900fad45 | 641 | /* has or had linked timeout */ |
6b47ee6e | 642 | REQ_F_LINK_TIMEOUT = BIT(REQ_F_LINK_TIMEOUT_BIT), |
6b47ee6e PB |
643 | /* regular file */ |
644 | REQ_F_ISREG = BIT(REQ_F_ISREG_BIT), | |
99bc4c38 PB |
645 | /* needs cleanup */ |
646 | REQ_F_NEED_CLEANUP = BIT(REQ_F_NEED_CLEANUP_BIT), | |
d7718a9d JA |
647 | /* already went through poll handler */ |
648 | REQ_F_POLLED = BIT(REQ_F_POLLED_BIT), | |
bcda7baa JA |
649 | /* buffer already selected */ |
650 | REQ_F_BUFFER_SELECTED = BIT(REQ_F_BUFFER_SELECTED_BIT), | |
5b0bbee4 JA |
651 | /* doesn't need file table for this request */ |
652 | REQ_F_NO_FILE_TABLE = BIT(REQ_F_NO_FILE_TABLE_BIT), | |
7cdaf587 XW |
653 | /* io_wq_work is initialized */ |
654 | REQ_F_WORK_INITIALIZED = BIT(REQ_F_WORK_INITIALIZED_BIT), | |
900fad45 PB |
655 | /* linked timeout is active, i.e. prepared by link's head */ |
656 | REQ_F_LTIMEOUT_ACTIVE = BIT(REQ_F_LTIMEOUT_ACTIVE_BIT), | |
d7718a9d JA |
657 | }; |
658 | ||
659 | struct async_poll { | |
660 | struct io_poll_iocb poll; | |
807abcb0 | 661 | struct io_poll_iocb *double_poll; |
6b47ee6e PB |
662 | }; |
663 | ||
09bb8394 JA |
664 | /* |
665 | * NOTE! Each of the iocb union members has the file pointer | |
666 | * as the first entry in their struct definition. So you can | |
667 | * access the file pointer through any of the sub-structs, | |
668 | * or directly as just 'ki_filp' in this struct. | |
669 | */ | |
2b188cc1 | 670 | struct io_kiocb { |
221c5eb2 | 671 | union { |
09bb8394 | 672 | struct file *file; |
9adbd45d | 673 | struct io_rw rw; |
221c5eb2 | 674 | struct io_poll_iocb poll; |
8ed8d3c3 JA |
675 | struct io_accept accept; |
676 | struct io_sync sync; | |
fbf23849 | 677 | struct io_cancel cancel; |
b29472ee | 678 | struct io_timeout timeout; |
0bdf7a2d | 679 | struct io_timeout_rem timeout_rem; |
3fbb51c1 | 680 | struct io_connect connect; |
e47293fd | 681 | struct io_sr_msg sr_msg; |
15b71abe | 682 | struct io_open open; |
b5dba59e | 683 | struct io_close close; |
05f3fb3c | 684 | struct io_files_update files_update; |
4840e418 | 685 | struct io_fadvise fadvise; |
c1ca757b | 686 | struct io_madvise madvise; |
3e4827b0 | 687 | struct io_epoll epoll; |
7d67af2c | 688 | struct io_splice splice; |
ddf0322d | 689 | struct io_provide_buf pbuf; |
1d9e1288 | 690 | struct io_statx statx; |
36f4fa68 | 691 | struct io_shutdown shutdown; |
80a261fd | 692 | struct io_rename rename; |
14a1143b | 693 | struct io_unlink unlink; |
3ca405eb PB |
694 | /* use only after cleaning per-op data, see io_clean_op() */ |
695 | struct io_completion compl; | |
221c5eb2 | 696 | }; |
2b188cc1 | 697 | |
e8c2bc1f JA |
698 | /* opcode allocated if it needs to store data for async defer */ |
699 | void *async_data; | |
d625c6ee | 700 | u8 opcode; |
65a6543d XW |
701 | /* polled IO has completed */ |
702 | u8 iopoll_completed; | |
2b188cc1 | 703 | |
4f4eeba8 | 704 | u16 buf_index; |
9cf7c104 | 705 | u32 result; |
4f4eeba8 | 706 | |
010e8e6b PB |
707 | struct io_ring_ctx *ctx; |
708 | unsigned int flags; | |
709 | refcount_t refs; | |
710 | struct task_struct *task; | |
711 | u64 user_data; | |
d7718a9d | 712 | |
010e8e6b | 713 | struct list_head link_list; |
fcb323cc | 714 | |
d21ffe7e PB |
715 | /* |
716 | * 1. used with ctx->iopoll_list with reads/writes | |
717 | * 2. to track reqs with ->files (see io_op_def::file_table) | |
718 | */ | |
010e8e6b PB |
719 | struct list_head inflight_entry; |
720 | ||
721 | struct percpu_ref *fixed_file_refs; | |
722 | struct callback_head task_work; | |
723 | /* for polled requests, i.e. IORING_OP_POLL_ADD and async armed poll */ | |
724 | struct hlist_node hash_node; | |
725 | struct async_poll *apoll; | |
726 | struct io_wq_work work; | |
2b188cc1 | 727 | }; |
05589553 | 728 | |
27dc8338 PB |
729 | struct io_defer_entry { |
730 | struct list_head list; | |
731 | struct io_kiocb *req; | |
9cf7c104 | 732 | u32 seq; |
2b188cc1 JA |
733 | }; |
734 | ||
def596e9 | 735 | #define IO_IOPOLL_BATCH 8 |
2b188cc1 | 736 | |
013538bd JA |
737 | struct io_comp_state { |
738 | unsigned int nr; | |
739 | struct list_head list; | |
740 | struct io_ring_ctx *ctx; | |
741 | }; | |
742 | ||
9a56a232 JA |
743 | struct io_submit_state { |
744 | struct blk_plug plug; | |
745 | ||
2579f913 JA |
746 | /* |
747 | * io_kiocb alloc cache | |
748 | */ | |
749 | void *reqs[IO_IOPOLL_BATCH]; | |
6c8a3134 | 750 | unsigned int free_reqs; |
2579f913 | 751 | |
013538bd JA |
752 | /* |
753 | * Batch completion logic | |
754 | */ | |
755 | struct io_comp_state comp; | |
756 | ||
9a56a232 JA |
757 | /* |
758 | * File reference cache | |
759 | */ | |
760 | struct file *file; | |
761 | unsigned int fd; | |
762 | unsigned int has_refs; | |
9a56a232 JA |
763 | unsigned int ios_left; |
764 | }; | |
765 | ||
d3656344 | 766 | struct io_op_def { |
d3656344 JA |
767 | /* needs req->file assigned */ |
768 | unsigned needs_file : 1; | |
fd2206e4 JA |
769 | /* don't fail if file grab fails */ |
770 | unsigned needs_file_no_error : 1; | |
d3656344 JA |
771 | /* hash wq insertion if file is a regular file */ |
772 | unsigned hash_reg_file : 1; | |
773 | /* unbound wq insertion if file is a non-regular file */ | |
774 | unsigned unbound_nonreg_file : 1; | |
66f4af93 JA |
775 | /* opcode is not supported by this kernel */ |
776 | unsigned not_supported : 1; | |
8a72758c JA |
777 | /* set if opcode supports polled "wait" */ |
778 | unsigned pollin : 1; | |
779 | unsigned pollout : 1; | |
bcda7baa JA |
780 | /* op supports buffer selection */ |
781 | unsigned buffer_select : 1; | |
e8c2bc1f JA |
782 | /* must always have async data allocated */ |
783 | unsigned needs_async_data : 1; | |
784 | /* size of async data needed, if any */ | |
785 | unsigned short async_size; | |
0f203765 | 786 | unsigned work_flags; |
d3656344 JA |
787 | }; |
788 | ||
0918682b | 789 | static const struct io_op_def io_op_defs[] = { |
0463b6c5 PB |
790 | [IORING_OP_NOP] = {}, |
791 | [IORING_OP_READV] = { | |
d3656344 JA |
792 | .needs_file = 1, |
793 | .unbound_nonreg_file = 1, | |
8a72758c | 794 | .pollin = 1, |
4d954c25 | 795 | .buffer_select = 1, |
e8c2bc1f JA |
796 | .needs_async_data = 1, |
797 | .async_size = sizeof(struct io_async_rw), | |
0f203765 | 798 | .work_flags = IO_WQ_WORK_MM | IO_WQ_WORK_BLKCG, |
d3656344 | 799 | }, |
0463b6c5 | 800 | [IORING_OP_WRITEV] = { |
d3656344 JA |
801 | .needs_file = 1, |
802 | .hash_reg_file = 1, | |
803 | .unbound_nonreg_file = 1, | |
8a72758c | 804 | .pollout = 1, |
e8c2bc1f JA |
805 | .needs_async_data = 1, |
806 | .async_size = sizeof(struct io_async_rw), | |
69228338 JA |
807 | .work_flags = IO_WQ_WORK_MM | IO_WQ_WORK_BLKCG | |
808 | IO_WQ_WORK_FSIZE, | |
d3656344 | 809 | }, |
0463b6c5 | 810 | [IORING_OP_FSYNC] = { |
d3656344 | 811 | .needs_file = 1, |
0f203765 | 812 | .work_flags = IO_WQ_WORK_BLKCG, |
d3656344 | 813 | }, |
0463b6c5 | 814 | [IORING_OP_READ_FIXED] = { |
d3656344 JA |
815 | .needs_file = 1, |
816 | .unbound_nonreg_file = 1, | |
8a72758c | 817 | .pollin = 1, |
e8c2bc1f | 818 | .async_size = sizeof(struct io_async_rw), |
4017eb91 | 819 | .work_flags = IO_WQ_WORK_BLKCG | IO_WQ_WORK_MM, |
d3656344 | 820 | }, |
0463b6c5 | 821 | [IORING_OP_WRITE_FIXED] = { |
d3656344 JA |
822 | .needs_file = 1, |
823 | .hash_reg_file = 1, | |
824 | .unbound_nonreg_file = 1, | |
8a72758c | 825 | .pollout = 1, |
e8c2bc1f | 826 | .async_size = sizeof(struct io_async_rw), |
4017eb91 JA |
827 | .work_flags = IO_WQ_WORK_BLKCG | IO_WQ_WORK_FSIZE | |
828 | IO_WQ_WORK_MM, | |
d3656344 | 829 | }, |
0463b6c5 | 830 | [IORING_OP_POLL_ADD] = { |
d3656344 JA |
831 | .needs_file = 1, |
832 | .unbound_nonreg_file = 1, | |
833 | }, | |
0463b6c5 PB |
834 | [IORING_OP_POLL_REMOVE] = {}, |
835 | [IORING_OP_SYNC_FILE_RANGE] = { | |
d3656344 | 836 | .needs_file = 1, |
0f203765 | 837 | .work_flags = IO_WQ_WORK_BLKCG, |
d3656344 | 838 | }, |
0463b6c5 | 839 | [IORING_OP_SENDMSG] = { |
d3656344 JA |
840 | .needs_file = 1, |
841 | .unbound_nonreg_file = 1, | |
8a72758c | 842 | .pollout = 1, |
e8c2bc1f JA |
843 | .needs_async_data = 1, |
844 | .async_size = sizeof(struct io_async_msghdr), | |
0f203765 JA |
845 | .work_flags = IO_WQ_WORK_MM | IO_WQ_WORK_BLKCG | |
846 | IO_WQ_WORK_FS, | |
d3656344 | 847 | }, |
0463b6c5 | 848 | [IORING_OP_RECVMSG] = { |
d3656344 JA |
849 | .needs_file = 1, |
850 | .unbound_nonreg_file = 1, | |
8a72758c | 851 | .pollin = 1, |
52de1fe1 | 852 | .buffer_select = 1, |
e8c2bc1f JA |
853 | .needs_async_data = 1, |
854 | .async_size = sizeof(struct io_async_msghdr), | |
0f203765 JA |
855 | .work_flags = IO_WQ_WORK_MM | IO_WQ_WORK_BLKCG | |
856 | IO_WQ_WORK_FS, | |
d3656344 | 857 | }, |
0463b6c5 | 858 | [IORING_OP_TIMEOUT] = { |
e8c2bc1f JA |
859 | .needs_async_data = 1, |
860 | .async_size = sizeof(struct io_timeout_data), | |
0f203765 | 861 | .work_flags = IO_WQ_WORK_MM, |
d3656344 | 862 | }, |
0463b6c5 PB |
863 | [IORING_OP_TIMEOUT_REMOVE] = {}, |
864 | [IORING_OP_ACCEPT] = { | |
d3656344 JA |
865 | .needs_file = 1, |
866 | .unbound_nonreg_file = 1, | |
8a72758c | 867 | .pollin = 1, |
0f203765 | 868 | .work_flags = IO_WQ_WORK_MM | IO_WQ_WORK_FILES, |
d3656344 | 869 | }, |
0463b6c5 PB |
870 | [IORING_OP_ASYNC_CANCEL] = {}, |
871 | [IORING_OP_LINK_TIMEOUT] = { | |
e8c2bc1f JA |
872 | .needs_async_data = 1, |
873 | .async_size = sizeof(struct io_timeout_data), | |
0f203765 | 874 | .work_flags = IO_WQ_WORK_MM, |
d3656344 | 875 | }, |
0463b6c5 | 876 | [IORING_OP_CONNECT] = { |
d3656344 JA |
877 | .needs_file = 1, |
878 | .unbound_nonreg_file = 1, | |
8a72758c | 879 | .pollout = 1, |
e8c2bc1f JA |
880 | .needs_async_data = 1, |
881 | .async_size = sizeof(struct io_async_connect), | |
0f203765 | 882 | .work_flags = IO_WQ_WORK_MM, |
d3656344 | 883 | }, |
0463b6c5 | 884 | [IORING_OP_FALLOCATE] = { |
d3656344 | 885 | .needs_file = 1, |
69228338 | 886 | .work_flags = IO_WQ_WORK_BLKCG | IO_WQ_WORK_FSIZE, |
d3656344 | 887 | }, |
0463b6c5 | 888 | [IORING_OP_OPENAT] = { |
0f203765 | 889 | .work_flags = IO_WQ_WORK_FILES | IO_WQ_WORK_BLKCG | |
14587a46 | 890 | IO_WQ_WORK_FS | IO_WQ_WORK_MM, |
d3656344 | 891 | }, |
0463b6c5 | 892 | [IORING_OP_CLOSE] = { |
fd2206e4 JA |
893 | .needs_file = 1, |
894 | .needs_file_no_error = 1, | |
0f203765 | 895 | .work_flags = IO_WQ_WORK_FILES | IO_WQ_WORK_BLKCG, |
d3656344 | 896 | }, |
0463b6c5 | 897 | [IORING_OP_FILES_UPDATE] = { |
0f203765 | 898 | .work_flags = IO_WQ_WORK_FILES | IO_WQ_WORK_MM, |
d3656344 | 899 | }, |
0463b6c5 | 900 | [IORING_OP_STATX] = { |
0f203765 JA |
901 | .work_flags = IO_WQ_WORK_FILES | IO_WQ_WORK_MM | |
902 | IO_WQ_WORK_FS | IO_WQ_WORK_BLKCG, | |
d3656344 | 903 | }, |
0463b6c5 | 904 | [IORING_OP_READ] = { |
3a6820f2 JA |
905 | .needs_file = 1, |
906 | .unbound_nonreg_file = 1, | |
8a72758c | 907 | .pollin = 1, |
bcda7baa | 908 | .buffer_select = 1, |
e8c2bc1f | 909 | .async_size = sizeof(struct io_async_rw), |
0f203765 | 910 | .work_flags = IO_WQ_WORK_MM | IO_WQ_WORK_BLKCG, |
3a6820f2 | 911 | }, |
0463b6c5 | 912 | [IORING_OP_WRITE] = { |
3a6820f2 JA |
913 | .needs_file = 1, |
914 | .unbound_nonreg_file = 1, | |
8a72758c | 915 | .pollout = 1, |
e8c2bc1f | 916 | .async_size = sizeof(struct io_async_rw), |
69228338 JA |
917 | .work_flags = IO_WQ_WORK_MM | IO_WQ_WORK_BLKCG | |
918 | IO_WQ_WORK_FSIZE, | |
3a6820f2 | 919 | }, |
0463b6c5 | 920 | [IORING_OP_FADVISE] = { |
4840e418 | 921 | .needs_file = 1, |
0f203765 | 922 | .work_flags = IO_WQ_WORK_BLKCG, |
4840e418 | 923 | }, |
0463b6c5 | 924 | [IORING_OP_MADVISE] = { |
0f203765 | 925 | .work_flags = IO_WQ_WORK_MM | IO_WQ_WORK_BLKCG, |
c1ca757b | 926 | }, |
0463b6c5 | 927 | [IORING_OP_SEND] = { |
fddaface JA |
928 | .needs_file = 1, |
929 | .unbound_nonreg_file = 1, | |
8a72758c | 930 | .pollout = 1, |
0f203765 | 931 | .work_flags = IO_WQ_WORK_MM | IO_WQ_WORK_BLKCG, |
fddaface | 932 | }, |
0463b6c5 | 933 | [IORING_OP_RECV] = { |
fddaface JA |
934 | .needs_file = 1, |
935 | .unbound_nonreg_file = 1, | |
8a72758c | 936 | .pollin = 1, |
bcda7baa | 937 | .buffer_select = 1, |
0f203765 | 938 | .work_flags = IO_WQ_WORK_MM | IO_WQ_WORK_BLKCG, |
fddaface | 939 | }, |
0463b6c5 | 940 | [IORING_OP_OPENAT2] = { |
0f203765 | 941 | .work_flags = IO_WQ_WORK_FILES | IO_WQ_WORK_FS | |
14587a46 | 942 | IO_WQ_WORK_BLKCG | IO_WQ_WORK_MM, |
cebdb986 | 943 | }, |
3e4827b0 JA |
944 | [IORING_OP_EPOLL_CTL] = { |
945 | .unbound_nonreg_file = 1, | |
0f203765 | 946 | .work_flags = IO_WQ_WORK_FILES, |
3e4827b0 | 947 | }, |
7d67af2c PB |
948 | [IORING_OP_SPLICE] = { |
949 | .needs_file = 1, | |
950 | .hash_reg_file = 1, | |
951 | .unbound_nonreg_file = 1, | |
0f203765 | 952 | .work_flags = IO_WQ_WORK_BLKCG, |
ddf0322d JA |
953 | }, |
954 | [IORING_OP_PROVIDE_BUFFERS] = {}, | |
067524e9 | 955 | [IORING_OP_REMOVE_BUFFERS] = {}, |
f2a8d5c7 PB |
956 | [IORING_OP_TEE] = { |
957 | .needs_file = 1, | |
958 | .hash_reg_file = 1, | |
959 | .unbound_nonreg_file = 1, | |
960 | }, | |
36f4fa68 JA |
961 | [IORING_OP_SHUTDOWN] = { |
962 | .needs_file = 1, | |
963 | }, | |
80a261fd JA |
964 | [IORING_OP_RENAMEAT] = { |
965 | .work_flags = IO_WQ_WORK_MM | IO_WQ_WORK_FILES | | |
966 | IO_WQ_WORK_FS | IO_WQ_WORK_BLKCG, | |
967 | }, | |
14a1143b JA |
968 | [IORING_OP_UNLINKAT] = { |
969 | .work_flags = IO_WQ_WORK_MM | IO_WQ_WORK_FILES | | |
970 | IO_WQ_WORK_FS | IO_WQ_WORK_BLKCG, | |
971 | }, | |
d3656344 JA |
972 | }; |
973 | ||
2e0464d4 BM |
974 | enum io_mem_account { |
975 | ACCT_LOCKED, | |
976 | ACCT_PINNED, | |
977 | }; | |
978 | ||
81b68a5c PB |
979 | static void __io_complete_rw(struct io_kiocb *req, long res, long res2, |
980 | struct io_comp_state *cs); | |
78e19bbe | 981 | static void io_cqring_fill_event(struct io_kiocb *req, long res); |
ec9c02ad | 982 | static void io_put_req(struct io_kiocb *req); |
216578e5 | 983 | static void io_put_req_deferred(struct io_kiocb *req, int nr); |
c40f6379 | 984 | static void io_double_put_req(struct io_kiocb *req); |
94ae5e77 | 985 | static struct io_kiocb *io_prep_linked_timeout(struct io_kiocb *req); |
7271ef3a | 986 | static void __io_queue_linked_timeout(struct io_kiocb *req); |
94ae5e77 | 987 | static void io_queue_linked_timeout(struct io_kiocb *req); |
05f3fb3c JA |
988 | static int __io_sqe_files_update(struct io_ring_ctx *ctx, |
989 | struct io_uring_files_update *ip, | |
990 | unsigned nr_args); | |
3ca405eb | 991 | static void __io_clean_op(struct io_kiocb *req); |
8371adf5 PB |
992 | static struct file *io_file_get(struct io_submit_state *state, |
993 | struct io_kiocb *req, int fd, bool fixed); | |
c1379e24 | 994 | static void __io_queue_sqe(struct io_kiocb *req, struct io_comp_state *cs); |
4349f30e | 995 | static void io_file_put_work(struct work_struct *work); |
de0617e4 | 996 | |
b63534c4 JA |
997 | static ssize_t io_import_iovec(int rw, struct io_kiocb *req, |
998 | struct iovec **iovec, struct iov_iter *iter, | |
999 | bool needs_lock); | |
ff6165b2 JA |
1000 | static int io_setup_async_rw(struct io_kiocb *req, const struct iovec *iovec, |
1001 | const struct iovec *fast_iov, | |
227c0c96 | 1002 | struct iov_iter *iter, bool force); |
de0617e4 | 1003 | |
2b188cc1 JA |
1004 | static struct kmem_cache *req_cachep; |
1005 | ||
0918682b | 1006 | static const struct file_operations io_uring_fops; |
2b188cc1 JA |
1007 | |
1008 | struct sock *io_uring_get_socket(struct file *file) | |
1009 | { | |
1010 | #if defined(CONFIG_UNIX) | |
1011 | if (file->f_op == &io_uring_fops) { | |
1012 | struct io_ring_ctx *ctx = file->private_data; | |
1013 | ||
1014 | return ctx->ring_sock->sk; | |
1015 | } | |
1016 | #endif | |
1017 | return NULL; | |
1018 | } | |
1019 | EXPORT_SYMBOL(io_uring_get_socket); | |
1020 | ||
3ca405eb PB |
1021 | static inline void io_clean_op(struct io_kiocb *req) |
1022 | { | |
bb175342 PB |
1023 | if (req->flags & (REQ_F_NEED_CLEANUP | REQ_F_BUFFER_SELECTED | |
1024 | REQ_F_INFLIGHT)) | |
3ca405eb PB |
1025 | __io_clean_op(req); |
1026 | } | |
1027 | ||
28cea78a | 1028 | static void io_sq_thread_drop_mm_files(void) |
c40f6379 | 1029 | { |
28cea78a | 1030 | struct files_struct *files = current->files; |
c40f6379 JA |
1031 | struct mm_struct *mm = current->mm; |
1032 | ||
1033 | if (mm) { | |
1034 | kthread_unuse_mm(mm); | |
1035 | mmput(mm); | |
4b70cf9d | 1036 | current->mm = NULL; |
c40f6379 | 1037 | } |
28cea78a JA |
1038 | if (files) { |
1039 | struct nsproxy *nsproxy = current->nsproxy; | |
1040 | ||
1041 | task_lock(current); | |
1042 | current->files = NULL; | |
1043 | current->nsproxy = NULL; | |
1044 | task_unlock(current); | |
1045 | put_files_struct(files); | |
1046 | put_nsproxy(nsproxy); | |
1047 | } | |
1048 | } | |
1049 | ||
1050 | static void __io_sq_thread_acquire_files(struct io_ring_ctx *ctx) | |
1051 | { | |
1052 | if (!current->files) { | |
1053 | struct files_struct *files; | |
1054 | struct nsproxy *nsproxy; | |
1055 | ||
1056 | task_lock(ctx->sqo_task); | |
1057 | files = ctx->sqo_task->files; | |
1058 | if (!files) { | |
1059 | task_unlock(ctx->sqo_task); | |
1060 | return; | |
1061 | } | |
1062 | atomic_inc(&files->count); | |
1063 | get_nsproxy(ctx->sqo_task->nsproxy); | |
1064 | nsproxy = ctx->sqo_task->nsproxy; | |
1065 | task_unlock(ctx->sqo_task); | |
1066 | ||
1067 | task_lock(current); | |
1068 | current->files = files; | |
1069 | current->nsproxy = nsproxy; | |
1070 | task_unlock(current); | |
1071 | } | |
c40f6379 JA |
1072 | } |
1073 | ||
1074 | static int __io_sq_thread_acquire_mm(struct io_ring_ctx *ctx) | |
1075 | { | |
4b70cf9d JA |
1076 | struct mm_struct *mm; |
1077 | ||
1078 | if (current->mm) | |
1079 | return 0; | |
1080 | ||
1081 | /* Should never happen */ | |
1082 | if (unlikely(!(ctx->flags & IORING_SETUP_SQPOLL))) | |
1083 | return -EFAULT; | |
1084 | ||
1085 | task_lock(ctx->sqo_task); | |
1086 | mm = ctx->sqo_task->mm; | |
1087 | if (unlikely(!mm || !mmget_not_zero(mm))) | |
1088 | mm = NULL; | |
1089 | task_unlock(ctx->sqo_task); | |
1090 | ||
1091 | if (mm) { | |
1092 | kthread_use_mm(mm); | |
1093 | return 0; | |
c40f6379 JA |
1094 | } |
1095 | ||
4b70cf9d | 1096 | return -EFAULT; |
c40f6379 JA |
1097 | } |
1098 | ||
28cea78a JA |
1099 | static int io_sq_thread_acquire_mm_files(struct io_ring_ctx *ctx, |
1100 | struct io_kiocb *req) | |
c40f6379 | 1101 | { |
28cea78a JA |
1102 | const struct io_op_def *def = &io_op_defs[req->opcode]; |
1103 | ||
1104 | if (def->work_flags & IO_WQ_WORK_MM) { | |
1105 | int ret = __io_sq_thread_acquire_mm(ctx); | |
1106 | if (unlikely(ret)) | |
1107 | return ret; | |
1108 | } | |
1109 | ||
1110 | if (def->needs_file || (def->work_flags & IO_WQ_WORK_FILES)) | |
1111 | __io_sq_thread_acquire_files(ctx); | |
1112 | ||
1113 | return 0; | |
c40f6379 JA |
1114 | } |
1115 | ||
91d8f519 DZ |
1116 | static void io_sq_thread_associate_blkcg(struct io_ring_ctx *ctx, |
1117 | struct cgroup_subsys_state **cur_css) | |
1118 | ||
1119 | { | |
1120 | #ifdef CONFIG_BLK_CGROUP | |
1121 | /* puts the old one when swapping */ | |
1122 | if (*cur_css != ctx->sqo_blkcg_css) { | |
1123 | kthread_associate_blkcg(ctx->sqo_blkcg_css); | |
1124 | *cur_css = ctx->sqo_blkcg_css; | |
1125 | } | |
1126 | #endif | |
1127 | } | |
1128 | ||
1129 | static void io_sq_thread_unassociate_blkcg(void) | |
1130 | { | |
1131 | #ifdef CONFIG_BLK_CGROUP | |
1132 | kthread_associate_blkcg(NULL); | |
1133 | #endif | |
1134 | } | |
1135 | ||
c40f6379 JA |
1136 | static inline void req_set_fail_links(struct io_kiocb *req) |
1137 | { | |
1138 | if ((req->flags & (REQ_F_LINK | REQ_F_HARDLINK)) == REQ_F_LINK) | |
1139 | req->flags |= REQ_F_FAIL_LINK; | |
1140 | } | |
4a38aed2 | 1141 | |
1e6fa521 JA |
1142 | /* |
1143 | * None of these are dereferenced, they are simply used to check if any of | |
1144 | * them have changed. If we're under current and check they are still the | |
1145 | * same, we're fine to grab references to them for actual out-of-line use. | |
1146 | */ | |
1147 | static void io_init_identity(struct io_identity *id) | |
1148 | { | |
1149 | id->files = current->files; | |
1150 | id->mm = current->mm; | |
1151 | #ifdef CONFIG_BLK_CGROUP | |
1152 | rcu_read_lock(); | |
1153 | id->blkcg_css = blkcg_css(); | |
1154 | rcu_read_unlock(); | |
1155 | #endif | |
1156 | id->creds = current_cred(); | |
1157 | id->nsproxy = current->nsproxy; | |
1158 | id->fs = current->fs; | |
1159 | id->fsize = rlimit(RLIMIT_FSIZE); | |
4ea33a97 JA |
1160 | #ifdef CONFIG_AUDIT |
1161 | id->loginuid = current->loginuid; | |
1162 | id->sessionid = current->sessionid; | |
1163 | #endif | |
1e6fa521 JA |
1164 | refcount_set(&id->count, 1); |
1165 | } | |
1166 | ||
ec99ca6c PB |
1167 | static inline void __io_req_init_async(struct io_kiocb *req) |
1168 | { | |
1169 | memset(&req->work, 0, sizeof(req->work)); | |
1170 | req->flags |= REQ_F_WORK_INITIALIZED; | |
1171 | } | |
1172 | ||
7cdaf587 XW |
1173 | /* |
1174 | * Note: must call io_req_init_async() for the first time you | |
1175 | * touch any members of io_wq_work. | |
1176 | */ | |
1177 | static inline void io_req_init_async(struct io_kiocb *req) | |
1178 | { | |
500a373d JA |
1179 | struct io_uring_task *tctx = current->io_uring; |
1180 | ||
7cdaf587 XW |
1181 | if (req->flags & REQ_F_WORK_INITIALIZED) |
1182 | return; | |
1183 | ||
ec99ca6c | 1184 | __io_req_init_async(req); |
500a373d JA |
1185 | |
1186 | /* Grab a ref if this isn't our static identity */ | |
1187 | req->work.identity = tctx->identity; | |
1188 | if (tctx->identity != &tctx->__identity) | |
1189 | refcount_inc(&req->work.identity->count); | |
7cdaf587 XW |
1190 | } |
1191 | ||
0cdaf760 PB |
1192 | static inline bool io_async_submit(struct io_ring_ctx *ctx) |
1193 | { | |
1194 | return ctx->flags & IORING_SETUP_SQPOLL; | |
1195 | } | |
1196 | ||
2b188cc1 JA |
1197 | static void io_ring_ctx_ref_free(struct percpu_ref *ref) |
1198 | { | |
1199 | struct io_ring_ctx *ctx = container_of(ref, struct io_ring_ctx, refs); | |
1200 | ||
0f158b4c | 1201 | complete(&ctx->ref_comp); |
2b188cc1 JA |
1202 | } |
1203 | ||
8eb7e2d0 PB |
1204 | static inline bool io_is_timeout_noseq(struct io_kiocb *req) |
1205 | { | |
1206 | return !req->timeout.off; | |
1207 | } | |
1208 | ||
2b188cc1 JA |
1209 | static struct io_ring_ctx *io_ring_ctx_alloc(struct io_uring_params *p) |
1210 | { | |
1211 | struct io_ring_ctx *ctx; | |
78076bb6 | 1212 | int hash_bits; |
2b188cc1 JA |
1213 | |
1214 | ctx = kzalloc(sizeof(*ctx), GFP_KERNEL); | |
1215 | if (!ctx) | |
1216 | return NULL; | |
1217 | ||
0ddf92e8 JA |
1218 | ctx->fallback_req = kmem_cache_alloc(req_cachep, GFP_KERNEL); |
1219 | if (!ctx->fallback_req) | |
1220 | goto err; | |
1221 | ||
78076bb6 JA |
1222 | /* |
1223 | * Use 5 bits less than the max cq entries, that should give us around | |
1224 | * 32 entries per hash list if totally full and uniformly spread. | |
1225 | */ | |
1226 | hash_bits = ilog2(p->cq_entries); | |
1227 | hash_bits -= 5; | |
1228 | if (hash_bits <= 0) | |
1229 | hash_bits = 1; | |
1230 | ctx->cancel_hash_bits = hash_bits; | |
1231 | ctx->cancel_hash = kmalloc((1U << hash_bits) * sizeof(struct hlist_head), | |
1232 | GFP_KERNEL); | |
1233 | if (!ctx->cancel_hash) | |
1234 | goto err; | |
1235 | __hash_init(ctx->cancel_hash, 1U << hash_bits); | |
1236 | ||
21482896 | 1237 | if (percpu_ref_init(&ctx->refs, io_ring_ctx_ref_free, |
206aefde JA |
1238 | PERCPU_REF_ALLOW_REINIT, GFP_KERNEL)) |
1239 | goto err; | |
2b188cc1 JA |
1240 | |
1241 | ctx->flags = p->flags; | |
90554200 | 1242 | init_waitqueue_head(&ctx->sqo_sq_wait); |
69fb2131 | 1243 | INIT_LIST_HEAD(&ctx->sqd_list); |
2b188cc1 | 1244 | init_waitqueue_head(&ctx->cq_wait); |
1d7bb1d5 | 1245 | INIT_LIST_HEAD(&ctx->cq_overflow_list); |
0f158b4c JA |
1246 | init_completion(&ctx->ref_comp); |
1247 | init_completion(&ctx->sq_thread_comp); | |
5a2e745d | 1248 | idr_init(&ctx->io_buffer_idr); |
071698e1 | 1249 | idr_init(&ctx->personality_idr); |
2b188cc1 JA |
1250 | mutex_init(&ctx->uring_lock); |
1251 | init_waitqueue_head(&ctx->wait); | |
1252 | spin_lock_init(&ctx->completion_lock); | |
540e32a0 | 1253 | INIT_LIST_HEAD(&ctx->iopoll_list); |
de0617e4 | 1254 | INIT_LIST_HEAD(&ctx->defer_list); |
5262f567 | 1255 | INIT_LIST_HEAD(&ctx->timeout_list); |
fcb323cc JA |
1256 | init_waitqueue_head(&ctx->inflight_wait); |
1257 | spin_lock_init(&ctx->inflight_lock); | |
1258 | INIT_LIST_HEAD(&ctx->inflight_list); | |
4a38aed2 JA |
1259 | INIT_DELAYED_WORK(&ctx->file_put_work, io_file_put_work); |
1260 | init_llist_head(&ctx->file_put_llist); | |
2b188cc1 | 1261 | return ctx; |
206aefde | 1262 | err: |
0ddf92e8 JA |
1263 | if (ctx->fallback_req) |
1264 | kmem_cache_free(req_cachep, ctx->fallback_req); | |
78076bb6 | 1265 | kfree(ctx->cancel_hash); |
206aefde JA |
1266 | kfree(ctx); |
1267 | return NULL; | |
2b188cc1 JA |
1268 | } |
1269 | ||
9cf7c104 | 1270 | static bool req_need_defer(struct io_kiocb *req, u32 seq) |
7adf4eaf | 1271 | { |
2bc9930e JA |
1272 | if (unlikely(req->flags & REQ_F_IO_DRAIN)) { |
1273 | struct io_ring_ctx *ctx = req->ctx; | |
a197f664 | 1274 | |
9cf7c104 | 1275 | return seq != ctx->cached_cq_tail |
2c3bac6d | 1276 | + READ_ONCE(ctx->cached_cq_overflow); |
2bc9930e | 1277 | } |
de0617e4 | 1278 | |
9d858b21 | 1279 | return false; |
de0617e4 JA |
1280 | } |
1281 | ||
de0617e4 | 1282 | static void __io_commit_cqring(struct io_ring_ctx *ctx) |
2b188cc1 | 1283 | { |
75b28aff | 1284 | struct io_rings *rings = ctx->rings; |
2b188cc1 | 1285 | |
07910158 PB |
1286 | /* order cqe stores with ring update */ |
1287 | smp_store_release(&rings->cq.tail, ctx->cached_cq_tail); | |
2b188cc1 | 1288 | |
07910158 PB |
1289 | if (wq_has_sleeper(&ctx->cq_wait)) { |
1290 | wake_up_interruptible(&ctx->cq_wait); | |
1291 | kill_fasync(&ctx->cq_fasync, SIGIO, POLL_IN); | |
2b188cc1 JA |
1292 | } |
1293 | } | |
1294 | ||
5c3462cf | 1295 | static void io_put_identity(struct io_uring_task *tctx, struct io_kiocb *req) |
1e6fa521 | 1296 | { |
500a373d | 1297 | if (req->work.identity == &tctx->__identity) |
1e6fa521 JA |
1298 | return; |
1299 | if (refcount_dec_and_test(&req->work.identity->count)) | |
1300 | kfree(req->work.identity); | |
1301 | } | |
1302 | ||
4edf20f9 | 1303 | static void io_req_clean_work(struct io_kiocb *req) |
18d9be1a | 1304 | { |
7cdaf587 | 1305 | if (!(req->flags & REQ_F_WORK_INITIALIZED)) |
4edf20f9 | 1306 | return; |
51a4cc11 JA |
1307 | |
1308 | req->flags &= ~REQ_F_WORK_INITIALIZED; | |
7cdaf587 | 1309 | |
dfead8a8 | 1310 | if (req->work.flags & IO_WQ_WORK_MM) { |
98447d65 | 1311 | mmdrop(req->work.identity->mm); |
dfead8a8 | 1312 | req->work.flags &= ~IO_WQ_WORK_MM; |
cccf0ee8 | 1313 | } |
91d8f519 | 1314 | #ifdef CONFIG_BLK_CGROUP |
dfead8a8 | 1315 | if (req->work.flags & IO_WQ_WORK_BLKCG) { |
98447d65 | 1316 | css_put(req->work.identity->blkcg_css); |
dfead8a8 JA |
1317 | req->work.flags &= ~IO_WQ_WORK_BLKCG; |
1318 | } | |
91d8f519 | 1319 | #endif |
dfead8a8 | 1320 | if (req->work.flags & IO_WQ_WORK_CREDS) { |
98447d65 | 1321 | put_cred(req->work.identity->creds); |
dfead8a8 | 1322 | req->work.flags &= ~IO_WQ_WORK_CREDS; |
cccf0ee8 | 1323 | } |
dfead8a8 | 1324 | if (req->work.flags & IO_WQ_WORK_FS) { |
98447d65 | 1325 | struct fs_struct *fs = req->work.identity->fs; |
51a4cc11 | 1326 | |
98447d65 | 1327 | spin_lock(&req->work.identity->fs->lock); |
ff002b30 JA |
1328 | if (--fs->users) |
1329 | fs = NULL; | |
98447d65 | 1330 | spin_unlock(&req->work.identity->fs->lock); |
ff002b30 JA |
1331 | if (fs) |
1332 | free_fs_struct(fs); | |
dfead8a8 | 1333 | req->work.flags &= ~IO_WQ_WORK_FS; |
ff002b30 | 1334 | } |
51a4cc11 | 1335 | |
5c3462cf | 1336 | io_put_identity(req->task->io_uring, req); |
561fb04a JA |
1337 | } |
1338 | ||
1e6fa521 JA |
1339 | /* |
1340 | * Create a private copy of io_identity, since some fields don't match | |
1341 | * the current context. | |
1342 | */ | |
1343 | static bool io_identity_cow(struct io_kiocb *req) | |
1344 | { | |
5c3462cf | 1345 | struct io_uring_task *tctx = current->io_uring; |
1e6fa521 JA |
1346 | const struct cred *creds = NULL; |
1347 | struct io_identity *id; | |
1348 | ||
1349 | if (req->work.flags & IO_WQ_WORK_CREDS) | |
1350 | creds = req->work.identity->creds; | |
1351 | ||
1352 | id = kmemdup(req->work.identity, sizeof(*id), GFP_KERNEL); | |
1353 | if (unlikely(!id)) { | |
1354 | req->work.flags |= IO_WQ_WORK_CANCEL; | |
1355 | return false; | |
1356 | } | |
1357 | ||
1358 | /* | |
1359 | * We can safely just re-init the creds we copied Either the field | |
1360 | * matches the current one, or we haven't grabbed it yet. The only | |
1361 | * exception is ->creds, through registered personalities, so handle | |
1362 | * that one separately. | |
1363 | */ | |
1364 | io_init_identity(id); | |
1365 | if (creds) | |
1366 | req->work.identity->creds = creds; | |
1367 | ||
1368 | /* add one for this request */ | |
1369 | refcount_inc(&id->count); | |
1370 | ||
cb8a8ae3 JA |
1371 | /* drop tctx and req identity references, if needed */ |
1372 | if (tctx->identity != &tctx->__identity && | |
1373 | refcount_dec_and_test(&tctx->identity->count)) | |
1374 | kfree(tctx->identity); | |
1375 | if (req->work.identity != &tctx->__identity && | |
1376 | refcount_dec_and_test(&req->work.identity->count)) | |
1e6fa521 JA |
1377 | kfree(req->work.identity); |
1378 | ||
1379 | req->work.identity = id; | |
500a373d | 1380 | tctx->identity = id; |
1e6fa521 JA |
1381 | return true; |
1382 | } | |
1383 | ||
1384 | static bool io_grab_identity(struct io_kiocb *req) | |
18d9be1a | 1385 | { |
d3656344 | 1386 | const struct io_op_def *def = &io_op_defs[req->opcode]; |
5c3462cf | 1387 | struct io_identity *id = req->work.identity; |
23329513 | 1388 | struct io_ring_ctx *ctx = req->ctx; |
54a91f3b | 1389 | |
69228338 JA |
1390 | if (def->work_flags & IO_WQ_WORK_FSIZE) { |
1391 | if (id->fsize != rlimit(RLIMIT_FSIZE)) | |
1392 | return false; | |
1393 | req->work.flags |= IO_WQ_WORK_FSIZE; | |
1394 | } | |
16d59803 | 1395 | |
dfead8a8 | 1396 | if (!(req->work.flags & IO_WQ_WORK_FILES) && |
1e6fa521 | 1397 | (def->work_flags & IO_WQ_WORK_FILES) && |
23329513 | 1398 | !(req->flags & REQ_F_NO_FILE_TABLE)) { |
1e6fa521 JA |
1399 | if (id->files != current->files || |
1400 | id->nsproxy != current->nsproxy) | |
1401 | return false; | |
1402 | atomic_inc(&id->files->count); | |
1403 | get_nsproxy(id->nsproxy); | |
23329513 PB |
1404 | req->flags |= REQ_F_INFLIGHT; |
1405 | ||
1406 | spin_lock_irq(&ctx->inflight_lock); | |
1407 | list_add(&req->inflight_entry, &ctx->inflight_list); | |
1408 | spin_unlock_irq(&ctx->inflight_lock); | |
dfead8a8 | 1409 | req->work.flags |= IO_WQ_WORK_FILES; |
dca9cf8b | 1410 | } |
91d8f519 | 1411 | #ifdef CONFIG_BLK_CGROUP |
dfead8a8 JA |
1412 | if (!(req->work.flags & IO_WQ_WORK_BLKCG) && |
1413 | (def->work_flags & IO_WQ_WORK_BLKCG)) { | |
91d8f519 | 1414 | rcu_read_lock(); |
1e6fa521 JA |
1415 | if (id->blkcg_css != blkcg_css()) { |
1416 | rcu_read_unlock(); | |
1417 | return false; | |
1418 | } | |
91d8f519 DZ |
1419 | /* |
1420 | * This should be rare, either the cgroup is dying or the task | |
1421 | * is moving cgroups. Just punt to root for the handful of ios. | |
1422 | */ | |
1e6fa521 | 1423 | if (css_tryget_online(id->blkcg_css)) |
dfead8a8 | 1424 | req->work.flags |= IO_WQ_WORK_BLKCG; |
91d8f519 DZ |
1425 | rcu_read_unlock(); |
1426 | } | |
1427 | #endif | |
dfead8a8 | 1428 | if (!(req->work.flags & IO_WQ_WORK_CREDS)) { |
1e6fa521 JA |
1429 | if (id->creds != current_cred()) |
1430 | return false; | |
1431 | get_cred(id->creds); | |
dfead8a8 JA |
1432 | req->work.flags |= IO_WQ_WORK_CREDS; |
1433 | } | |
4ea33a97 JA |
1434 | #ifdef CONFIG_AUDIT |
1435 | if (!uid_eq(current->loginuid, id->loginuid) || | |
1436 | current->sessionid != id->sessionid) | |
1437 | return false; | |
1438 | #endif | |
dfead8a8 JA |
1439 | if (!(req->work.flags & IO_WQ_WORK_FS) && |
1440 | (def->work_flags & IO_WQ_WORK_FS)) { | |
1e6fa521 JA |
1441 | if (current->fs != id->fs) |
1442 | return false; | |
1443 | spin_lock(&id->fs->lock); | |
1444 | if (!id->fs->in_exec) { | |
1445 | id->fs->users++; | |
dfead8a8 | 1446 | req->work.flags |= IO_WQ_WORK_FS; |
dca9cf8b PB |
1447 | } else { |
1448 | req->work.flags |= IO_WQ_WORK_CANCEL; | |
1449 | } | |
1450 | spin_unlock(¤t->fs->lock); | |
1451 | } | |
1e6fa521 JA |
1452 | |
1453 | return true; | |
1454 | } | |
1455 | ||
1456 | static void io_prep_async_work(struct io_kiocb *req) | |
1457 | { | |
1458 | const struct io_op_def *def = &io_op_defs[req->opcode]; | |
1e6fa521 | 1459 | struct io_ring_ctx *ctx = req->ctx; |
5c3462cf | 1460 | struct io_identity *id; |
1e6fa521 JA |
1461 | |
1462 | io_req_init_async(req); | |
5c3462cf | 1463 | id = req->work.identity; |
1e6fa521 | 1464 | |
feaadc4f PB |
1465 | if (req->flags & REQ_F_FORCE_ASYNC) |
1466 | req->work.flags |= IO_WQ_WORK_CONCURRENT; | |
1467 | ||
1e6fa521 JA |
1468 | if (req->flags & REQ_F_ISREG) { |
1469 | if (def->hash_reg_file || (ctx->flags & IORING_SETUP_IOPOLL)) | |
1470 | io_wq_hash_work(&req->work, file_inode(req->file)); | |
1471 | } else { | |
1472 | if (def->unbound_nonreg_file) | |
1473 | req->work.flags |= IO_WQ_WORK_UNBOUND; | |
1474 | } | |
1475 | ||
1476 | /* ->mm can never change on us */ | |
1477 | if (!(req->work.flags & IO_WQ_WORK_MM) && | |
1478 | (def->work_flags & IO_WQ_WORK_MM)) { | |
1479 | mmgrab(id->mm); | |
1480 | req->work.flags |= IO_WQ_WORK_MM; | |
1481 | } | |
1482 | ||
1483 | /* if we fail grabbing identity, we must COW, regrab, and retry */ | |
1484 | if (io_grab_identity(req)) | |
1485 | return; | |
1486 | ||
1487 | if (!io_identity_cow(req)) | |
1488 | return; | |
1489 | ||
1490 | /* can't fail at this point */ | |
1491 | if (!io_grab_identity(req)) | |
1492 | WARN_ON(1); | |
561fb04a | 1493 | } |
cccf0ee8 | 1494 | |
cbdcb435 | 1495 | static void io_prep_async_link(struct io_kiocb *req) |
561fb04a | 1496 | { |
cbdcb435 | 1497 | struct io_kiocb *cur; |
54a91f3b | 1498 | |
cbdcb435 PB |
1499 | io_prep_async_work(req); |
1500 | if (req->flags & REQ_F_LINK_HEAD) | |
1501 | list_for_each_entry(cur, &req->link_list, link_list) | |
1502 | io_prep_async_work(cur); | |
561fb04a JA |
1503 | } |
1504 | ||
7271ef3a | 1505 | static struct io_kiocb *__io_queue_async_work(struct io_kiocb *req) |
561fb04a | 1506 | { |
a197f664 | 1507 | struct io_ring_ctx *ctx = req->ctx; |
cbdcb435 | 1508 | struct io_kiocb *link = io_prep_linked_timeout(req); |
561fb04a | 1509 | |
8766dd51 PB |
1510 | trace_io_uring_queue_async_work(ctx, io_wq_is_hashed(&req->work), req, |
1511 | &req->work, req->flags); | |
1512 | io_wq_enqueue(ctx->io_wq, &req->work); | |
7271ef3a | 1513 | return link; |
18d9be1a JA |
1514 | } |
1515 | ||
cbdcb435 PB |
1516 | static void io_queue_async_work(struct io_kiocb *req) |
1517 | { | |
7271ef3a JA |
1518 | struct io_kiocb *link; |
1519 | ||
cbdcb435 PB |
1520 | /* init ->work of the whole link before punting */ |
1521 | io_prep_async_link(req); | |
7271ef3a JA |
1522 | link = __io_queue_async_work(req); |
1523 | ||
1524 | if (link) | |
1525 | io_queue_linked_timeout(link); | |
cbdcb435 PB |
1526 | } |
1527 | ||
5262f567 JA |
1528 | static void io_kill_timeout(struct io_kiocb *req) |
1529 | { | |
e8c2bc1f | 1530 | struct io_timeout_data *io = req->async_data; |
5262f567 JA |
1531 | int ret; |
1532 | ||
e8c2bc1f | 1533 | ret = hrtimer_try_to_cancel(&io->timer); |
5262f567 | 1534 | if (ret != -1) { |
01cec8c1 PB |
1535 | atomic_set(&req->ctx->cq_timeouts, |
1536 | atomic_read(&req->ctx->cq_timeouts) + 1); | |
135fcde8 | 1537 | list_del_init(&req->timeout.list); |
78e19bbe | 1538 | io_cqring_fill_event(req, 0); |
216578e5 | 1539 | io_put_req_deferred(req, 1); |
5262f567 JA |
1540 | } |
1541 | } | |
1542 | ||
f3606e3a JA |
1543 | static bool io_task_match(struct io_kiocb *req, struct task_struct *tsk) |
1544 | { | |
1545 | struct io_ring_ctx *ctx = req->ctx; | |
1546 | ||
1547 | if (!tsk || req->task == tsk) | |
1548 | return true; | |
534ca6d6 JA |
1549 | if (ctx->flags & IORING_SETUP_SQPOLL) { |
1550 | if (ctx->sq_data && req->task == ctx->sq_data->thread) | |
1551 | return true; | |
1552 | } | |
f3606e3a JA |
1553 | return false; |
1554 | } | |
1555 | ||
76e1b642 JA |
1556 | /* |
1557 | * Returns true if we found and killed one or more timeouts | |
1558 | */ | |
1559 | static bool io_kill_timeouts(struct io_ring_ctx *ctx, struct task_struct *tsk) | |
5262f567 JA |
1560 | { |
1561 | struct io_kiocb *req, *tmp; | |
76e1b642 | 1562 | int canceled = 0; |
5262f567 JA |
1563 | |
1564 | spin_lock_irq(&ctx->completion_lock); | |
f3606e3a | 1565 | list_for_each_entry_safe(req, tmp, &ctx->timeout_list, timeout.list) { |
76e1b642 | 1566 | if (io_task_match(req, tsk)) { |
f3606e3a | 1567 | io_kill_timeout(req); |
76e1b642 JA |
1568 | canceled++; |
1569 | } | |
f3606e3a | 1570 | } |
5262f567 | 1571 | spin_unlock_irq(&ctx->completion_lock); |
76e1b642 | 1572 | return canceled != 0; |
5262f567 JA |
1573 | } |
1574 | ||
04518945 | 1575 | static void __io_queue_deferred(struct io_ring_ctx *ctx) |
de0617e4 | 1576 | { |
04518945 | 1577 | do { |
27dc8338 PB |
1578 | struct io_defer_entry *de = list_first_entry(&ctx->defer_list, |
1579 | struct io_defer_entry, list); | |
7271ef3a | 1580 | struct io_kiocb *link; |
de0617e4 | 1581 | |
9cf7c104 | 1582 | if (req_need_defer(de->req, de->seq)) |
04518945 | 1583 | break; |
27dc8338 | 1584 | list_del_init(&de->list); |
cbdcb435 | 1585 | /* punt-init is done before queueing for defer */ |
7271ef3a JA |
1586 | link = __io_queue_async_work(de->req); |
1587 | if (link) { | |
1588 | __io_queue_linked_timeout(link); | |
1589 | /* drop submission reference */ | |
216578e5 | 1590 | io_put_req_deferred(link, 1); |
7271ef3a | 1591 | } |
27dc8338 | 1592 | kfree(de); |
04518945 PB |
1593 | } while (!list_empty(&ctx->defer_list)); |
1594 | } | |
1595 | ||
360428f8 | 1596 | static void io_flush_timeouts(struct io_ring_ctx *ctx) |
de0617e4 | 1597 | { |
360428f8 PB |
1598 | while (!list_empty(&ctx->timeout_list)) { |
1599 | struct io_kiocb *req = list_first_entry(&ctx->timeout_list, | |
135fcde8 | 1600 | struct io_kiocb, timeout.list); |
de0617e4 | 1601 | |
8eb7e2d0 | 1602 | if (io_is_timeout_noseq(req)) |
360428f8 | 1603 | break; |
bfe68a22 PB |
1604 | if (req->timeout.target_seq != ctx->cached_cq_tail |
1605 | - atomic_read(&ctx->cq_timeouts)) | |
360428f8 | 1606 | break; |
bfe68a22 | 1607 | |
135fcde8 | 1608 | list_del_init(&req->timeout.list); |
5262f567 | 1609 | io_kill_timeout(req); |
360428f8 PB |
1610 | } |
1611 | } | |
5262f567 | 1612 | |
360428f8 PB |
1613 | static void io_commit_cqring(struct io_ring_ctx *ctx) |
1614 | { | |
1615 | io_flush_timeouts(ctx); | |
de0617e4 JA |
1616 | __io_commit_cqring(ctx); |
1617 | ||
04518945 PB |
1618 | if (unlikely(!list_empty(&ctx->defer_list))) |
1619 | __io_queue_deferred(ctx); | |
de0617e4 JA |
1620 | } |
1621 | ||
90554200 JA |
1622 | static inline bool io_sqring_full(struct io_ring_ctx *ctx) |
1623 | { | |
1624 | struct io_rings *r = ctx->rings; | |
1625 | ||
1626 | return READ_ONCE(r->sq.tail) - ctx->cached_sq_head == r->sq_ring_entries; | |
1627 | } | |
1628 | ||
2b188cc1 JA |
1629 | static struct io_uring_cqe *io_get_cqring(struct io_ring_ctx *ctx) |
1630 | { | |
75b28aff | 1631 | struct io_rings *rings = ctx->rings; |
2b188cc1 JA |
1632 | unsigned tail; |
1633 | ||
1634 | tail = ctx->cached_cq_tail; | |
115e12e5 SB |
1635 | /* |
1636 | * writes to the cq entry need to come after reading head; the | |
1637 | * control dependency is enough as we're using WRITE_ONCE to | |
1638 | * fill the cq entry | |
1639 | */ | |
75b28aff | 1640 | if (tail - READ_ONCE(rings->cq.head) == rings->cq_ring_entries) |
2b188cc1 JA |
1641 | return NULL; |
1642 | ||
1643 | ctx->cached_cq_tail++; | |
75b28aff | 1644 | return &rings->cqes[tail & ctx->cq_mask]; |
2b188cc1 JA |
1645 | } |
1646 | ||
f2842ab5 JA |
1647 | static inline bool io_should_trigger_evfd(struct io_ring_ctx *ctx) |
1648 | { | |
f0b493e6 JA |
1649 | if (!ctx->cq_ev_fd) |
1650 | return false; | |
7e55a19c SG |
1651 | if (READ_ONCE(ctx->rings->cq_flags) & IORING_CQ_EVENTFD_DISABLED) |
1652 | return false; | |
f2842ab5 JA |
1653 | if (!ctx->eventfd_async) |
1654 | return true; | |
b41e9852 | 1655 | return io_wq_current_is_worker(); |
f2842ab5 JA |
1656 | } |
1657 | ||
b41e9852 | 1658 | static void io_cqring_ev_posted(struct io_ring_ctx *ctx) |
1d7bb1d5 JA |
1659 | { |
1660 | if (waitqueue_active(&ctx->wait)) | |
1661 | wake_up(&ctx->wait); | |
534ca6d6 JA |
1662 | if (ctx->sq_data && waitqueue_active(&ctx->sq_data->wait)) |
1663 | wake_up(&ctx->sq_data->wait); | |
b41e9852 | 1664 | if (io_should_trigger_evfd(ctx)) |
1d7bb1d5 JA |
1665 | eventfd_signal(ctx->cq_ev_fd, 1); |
1666 | } | |
1667 | ||
46930143 PB |
1668 | static void io_cqring_mark_overflow(struct io_ring_ctx *ctx) |
1669 | { | |
1670 | if (list_empty(&ctx->cq_overflow_list)) { | |
1671 | clear_bit(0, &ctx->sq_check_overflow); | |
1672 | clear_bit(0, &ctx->cq_check_overflow); | |
1673 | ctx->rings->sq_flags &= ~IORING_SQ_CQ_OVERFLOW; | |
1674 | } | |
1675 | } | |
1676 | ||
99b32808 PB |
1677 | static inline bool __io_match_files(struct io_kiocb *req, |
1678 | struct files_struct *files) | |
e6c8aa9a | 1679 | { |
99b32808 PB |
1680 | return ((req->flags & REQ_F_WORK_INITIALIZED) && |
1681 | (req->work.flags & IO_WQ_WORK_FILES)) && | |
1682 | req->work.identity->files == files; | |
1683 | } | |
1684 | ||
1685 | static bool io_match_files(struct io_kiocb *req, | |
1686 | struct files_struct *files) | |
1687 | { | |
1688 | struct io_kiocb *link; | |
1689 | ||
e6c8aa9a JA |
1690 | if (!files) |
1691 | return true; | |
99b32808 PB |
1692 | if (__io_match_files(req, files)) |
1693 | return true; | |
1694 | if (req->flags & REQ_F_LINK_HEAD) { | |
1695 | list_for_each_entry(link, &req->link_list, link_list) { | |
1696 | if (__io_match_files(link, files)) | |
1697 | return true; | |
1698 | } | |
1699 | } | |
e6c8aa9a JA |
1700 | return false; |
1701 | } | |
1702 | ||
c4a2ed72 | 1703 | /* Returns true if there are no backlogged entries after the flush */ |
e6c8aa9a JA |
1704 | static bool io_cqring_overflow_flush(struct io_ring_ctx *ctx, bool force, |
1705 | struct task_struct *tsk, | |
1706 | struct files_struct *files) | |
1d7bb1d5 JA |
1707 | { |
1708 | struct io_rings *rings = ctx->rings; | |
e6c8aa9a | 1709 | struct io_kiocb *req, *tmp; |
1d7bb1d5 | 1710 | struct io_uring_cqe *cqe; |
1d7bb1d5 JA |
1711 | unsigned long flags; |
1712 | LIST_HEAD(list); | |
1713 | ||
1714 | if (!force) { | |
1715 | if (list_empty_careful(&ctx->cq_overflow_list)) | |
c4a2ed72 | 1716 | return true; |
1d7bb1d5 JA |
1717 | if ((ctx->cached_cq_tail - READ_ONCE(rings->cq.head) == |
1718 | rings->cq_ring_entries)) | |
c4a2ed72 | 1719 | return false; |
1d7bb1d5 JA |
1720 | } |
1721 | ||
1722 | spin_lock_irqsave(&ctx->completion_lock, flags); | |
1723 | ||
1724 | /* if force is set, the ring is going away. always drop after that */ | |
1725 | if (force) | |
69b3e546 | 1726 | ctx->cq_overflow_flushed = 1; |
1d7bb1d5 | 1727 | |
c4a2ed72 | 1728 | cqe = NULL; |
e6c8aa9a JA |
1729 | list_for_each_entry_safe(req, tmp, &ctx->cq_overflow_list, compl.list) { |
1730 | if (tsk && req->task != tsk) | |
1731 | continue; | |
1732 | if (!io_match_files(req, files)) | |
1733 | continue; | |
1734 | ||
1d7bb1d5 JA |
1735 | cqe = io_get_cqring(ctx); |
1736 | if (!cqe && !force) | |
1737 | break; | |
1738 | ||
40d8ddd4 | 1739 | list_move(&req->compl.list, &list); |
1d7bb1d5 JA |
1740 | if (cqe) { |
1741 | WRITE_ONCE(cqe->user_data, req->user_data); | |
1742 | WRITE_ONCE(cqe->res, req->result); | |
0f7e466b | 1743 | WRITE_ONCE(cqe->flags, req->compl.cflags); |
1d7bb1d5 | 1744 | } else { |
2c3bac6d | 1745 | ctx->cached_cq_overflow++; |
1d7bb1d5 | 1746 | WRITE_ONCE(ctx->rings->cq_overflow, |
2c3bac6d | 1747 | ctx->cached_cq_overflow); |
1d7bb1d5 JA |
1748 | } |
1749 | } | |
1750 | ||
1751 | io_commit_cqring(ctx); | |
46930143 PB |
1752 | io_cqring_mark_overflow(ctx); |
1753 | ||
1d7bb1d5 JA |
1754 | spin_unlock_irqrestore(&ctx->completion_lock, flags); |
1755 | io_cqring_ev_posted(ctx); | |
1756 | ||
1757 | while (!list_empty(&list)) { | |
40d8ddd4 PB |
1758 | req = list_first_entry(&list, struct io_kiocb, compl.list); |
1759 | list_del(&req->compl.list); | |
ec9c02ad | 1760 | io_put_req(req); |
1d7bb1d5 | 1761 | } |
c4a2ed72 JA |
1762 | |
1763 | return cqe != NULL; | |
1d7bb1d5 JA |
1764 | } |
1765 | ||
bcda7baa | 1766 | static void __io_cqring_fill_event(struct io_kiocb *req, long res, long cflags) |
2b188cc1 | 1767 | { |
78e19bbe | 1768 | struct io_ring_ctx *ctx = req->ctx; |
2b188cc1 JA |
1769 | struct io_uring_cqe *cqe; |
1770 | ||
78e19bbe | 1771 | trace_io_uring_complete(ctx, req->user_data, res); |
51c3ff62 | 1772 | |
2b188cc1 JA |
1773 | /* |
1774 | * If we can't get a cq entry, userspace overflowed the | |
1775 | * submission (by quite a lot). Increment the overflow count in | |
1776 | * the ring. | |
1777 | */ | |
1778 | cqe = io_get_cqring(ctx); | |
1d7bb1d5 | 1779 | if (likely(cqe)) { |
78e19bbe | 1780 | WRITE_ONCE(cqe->user_data, req->user_data); |
2b188cc1 | 1781 | WRITE_ONCE(cqe->res, res); |
bcda7baa | 1782 | WRITE_ONCE(cqe->flags, cflags); |
fdaf083c JA |
1783 | } else if (ctx->cq_overflow_flushed || |
1784 | atomic_read(&req->task->io_uring->in_idle)) { | |
0f212204 JA |
1785 | /* |
1786 | * If we're in ring overflow flush mode, or in task cancel mode, | |
1787 | * then we cannot store the request for later flushing, we need | |
1788 | * to drop it on the floor. | |
1789 | */ | |
2c3bac6d PB |
1790 | ctx->cached_cq_overflow++; |
1791 | WRITE_ONCE(ctx->rings->cq_overflow, ctx->cached_cq_overflow); | |
1d7bb1d5 | 1792 | } else { |
ad3eb2c8 JA |
1793 | if (list_empty(&ctx->cq_overflow_list)) { |
1794 | set_bit(0, &ctx->sq_check_overflow); | |
1795 | set_bit(0, &ctx->cq_check_overflow); | |
6d5f9049 | 1796 | ctx->rings->sq_flags |= IORING_SQ_CQ_OVERFLOW; |
ad3eb2c8 | 1797 | } |
40d8ddd4 | 1798 | io_clean_op(req); |
1d7bb1d5 | 1799 | req->result = res; |
0f7e466b | 1800 | req->compl.cflags = cflags; |
40d8ddd4 PB |
1801 | refcount_inc(&req->refs); |
1802 | list_add_tail(&req->compl.list, &ctx->cq_overflow_list); | |
2b188cc1 JA |
1803 | } |
1804 | } | |
1805 | ||
bcda7baa JA |
1806 | static void io_cqring_fill_event(struct io_kiocb *req, long res) |
1807 | { | |
1808 | __io_cqring_fill_event(req, res, 0); | |
1809 | } | |
1810 | ||
e1e16097 | 1811 | static void io_cqring_add_event(struct io_kiocb *req, long res, long cflags) |
2b188cc1 | 1812 | { |
78e19bbe | 1813 | struct io_ring_ctx *ctx = req->ctx; |
2b188cc1 JA |
1814 | unsigned long flags; |
1815 | ||
1816 | spin_lock_irqsave(&ctx->completion_lock, flags); | |
bcda7baa | 1817 | __io_cqring_fill_event(req, res, cflags); |
2b188cc1 JA |
1818 | io_commit_cqring(ctx); |
1819 | spin_unlock_irqrestore(&ctx->completion_lock, flags); | |
1820 | ||
8c838788 | 1821 | io_cqring_ev_posted(ctx); |
2b188cc1 JA |
1822 | } |
1823 | ||
229a7b63 | 1824 | static void io_submit_flush_completions(struct io_comp_state *cs) |
bcda7baa | 1825 | { |
229a7b63 JA |
1826 | struct io_ring_ctx *ctx = cs->ctx; |
1827 | ||
1828 | spin_lock_irq(&ctx->completion_lock); | |
1829 | while (!list_empty(&cs->list)) { | |
1830 | struct io_kiocb *req; | |
1831 | ||
3ca405eb PB |
1832 | req = list_first_entry(&cs->list, struct io_kiocb, compl.list); |
1833 | list_del(&req->compl.list); | |
0f7e466b | 1834 | __io_cqring_fill_event(req, req->result, req->compl.cflags); |
216578e5 PB |
1835 | |
1836 | /* | |
1837 | * io_free_req() doesn't care about completion_lock unless one | |
1838 | * of these flags is set. REQ_F_WORK_INITIALIZED is in the list | |
1839 | * because of a potential deadlock with req->work.fs->lock | |
1840 | */ | |
1841 | if (req->flags & (REQ_F_FAIL_LINK|REQ_F_LINK_TIMEOUT | |
1842 | |REQ_F_WORK_INITIALIZED)) { | |
229a7b63 JA |
1843 | spin_unlock_irq(&ctx->completion_lock); |
1844 | io_put_req(req); | |
1845 | spin_lock_irq(&ctx->completion_lock); | |
216578e5 PB |
1846 | } else { |
1847 | io_put_req(req); | |
229a7b63 JA |
1848 | } |
1849 | } | |
1850 | io_commit_cqring(ctx); | |
1851 | spin_unlock_irq(&ctx->completion_lock); | |
1852 | ||
1853 | io_cqring_ev_posted(ctx); | |
1854 | cs->nr = 0; | |
1855 | } | |
1856 | ||
1857 | static void __io_req_complete(struct io_kiocb *req, long res, unsigned cflags, | |
1858 | struct io_comp_state *cs) | |
1859 | { | |
1860 | if (!cs) { | |
1861 | io_cqring_add_event(req, res, cflags); | |
1862 | io_put_req(req); | |
1863 | } else { | |
3ca405eb | 1864 | io_clean_op(req); |
229a7b63 | 1865 | req->result = res; |
0f7e466b | 1866 | req->compl.cflags = cflags; |
3ca405eb | 1867 | list_add_tail(&req->compl.list, &cs->list); |
229a7b63 JA |
1868 | if (++cs->nr >= 32) |
1869 | io_submit_flush_completions(cs); | |
1870 | } | |
e1e16097 JA |
1871 | } |
1872 | ||
1873 | static void io_req_complete(struct io_kiocb *req, long res) | |
bcda7baa | 1874 | { |
229a7b63 | 1875 | __io_req_complete(req, res, 0, NULL); |
bcda7baa JA |
1876 | } |
1877 | ||
0ddf92e8 JA |
1878 | static inline bool io_is_fallback_req(struct io_kiocb *req) |
1879 | { | |
1880 | return req == (struct io_kiocb *) | |
1881 | ((unsigned long) req->ctx->fallback_req & ~1UL); | |
1882 | } | |
1883 | ||
1884 | static struct io_kiocb *io_get_fallback_req(struct io_ring_ctx *ctx) | |
1885 | { | |
1886 | struct io_kiocb *req; | |
1887 | ||
1888 | req = ctx->fallback_req; | |
dd461af6 | 1889 | if (!test_and_set_bit_lock(0, (unsigned long *) &ctx->fallback_req)) |
0ddf92e8 JA |
1890 | return req; |
1891 | ||
1892 | return NULL; | |
1893 | } | |
1894 | ||
0553b8bd PB |
1895 | static struct io_kiocb *io_alloc_req(struct io_ring_ctx *ctx, |
1896 | struct io_submit_state *state) | |
2b188cc1 | 1897 | { |
f6b6c7d6 | 1898 | if (!state->free_reqs) { |
291b2821 | 1899 | gfp_t gfp = GFP_KERNEL | __GFP_NOWARN; |
2579f913 JA |
1900 | size_t sz; |
1901 | int ret; | |
1902 | ||
1903 | sz = min_t(size_t, state->ios_left, ARRAY_SIZE(state->reqs)); | |
fd6fab2c JA |
1904 | ret = kmem_cache_alloc_bulk(req_cachep, gfp, sz, state->reqs); |
1905 | ||
1906 | /* | |
1907 | * Bulk alloc is all-or-nothing. If we fail to get a batch, | |
1908 | * retry single alloc to be on the safe side. | |
1909 | */ | |
1910 | if (unlikely(ret <= 0)) { | |
1911 | state->reqs[0] = kmem_cache_alloc(req_cachep, gfp); | |
1912 | if (!state->reqs[0]) | |
0ddf92e8 | 1913 | goto fallback; |
fd6fab2c JA |
1914 | ret = 1; |
1915 | } | |
291b2821 | 1916 | state->free_reqs = ret; |
2b188cc1 JA |
1917 | } |
1918 | ||
291b2821 PB |
1919 | state->free_reqs--; |
1920 | return state->reqs[state->free_reqs]; | |
0ddf92e8 | 1921 | fallback: |
0553b8bd | 1922 | return io_get_fallback_req(ctx); |
2b188cc1 JA |
1923 | } |
1924 | ||
8da11c19 PB |
1925 | static inline void io_put_file(struct io_kiocb *req, struct file *file, |
1926 | bool fixed) | |
1927 | { | |
1928 | if (fixed) | |
05589553 | 1929 | percpu_ref_put(req->fixed_file_refs); |
8da11c19 PB |
1930 | else |
1931 | fput(file); | |
1932 | } | |
1933 | ||
4edf20f9 | 1934 | static void io_dismantle_req(struct io_kiocb *req) |
2b188cc1 | 1935 | { |
3ca405eb | 1936 | io_clean_op(req); |
929a3af9 | 1937 | |
e8c2bc1f JA |
1938 | if (req->async_data) |
1939 | kfree(req->async_data); | |
8da11c19 PB |
1940 | if (req->file) |
1941 | io_put_file(req, req->file, (req->flags & REQ_F_FIXED_FILE)); | |
fcb323cc | 1942 | |
4edf20f9 | 1943 | io_req_clean_work(req); |
e65ef56d JA |
1944 | } |
1945 | ||
216578e5 | 1946 | static void __io_free_req(struct io_kiocb *req) |
c6ca97b3 | 1947 | { |
0f212204 | 1948 | struct io_uring_task *tctx = req->task->io_uring; |
51a4cc11 | 1949 | struct io_ring_ctx *ctx = req->ctx; |
c6ca97b3 | 1950 | |
216578e5 | 1951 | io_dismantle_req(req); |
c6ca97b3 | 1952 | |
d8a6df10 | 1953 | percpu_counter_dec(&tctx->inflight); |
fdaf083c | 1954 | if (atomic_read(&tctx->in_idle)) |
0f212204 | 1955 | wake_up(&tctx->wait); |
e3bc8e9d JA |
1956 | put_task_struct(req->task); |
1957 | ||
b1e50e54 PB |
1958 | if (likely(!io_is_fallback_req(req))) |
1959 | kmem_cache_free(req_cachep, req); | |
1960 | else | |
ecfc5177 PB |
1961 | clear_bit_unlock(0, (unsigned long *) &ctx->fallback_req); |
1962 | percpu_ref_put(&ctx->refs); | |
e65ef56d JA |
1963 | } |
1964 | ||
c9abd7ad | 1965 | static void io_kill_linked_timeout(struct io_kiocb *req) |
2665abfd | 1966 | { |
a197f664 | 1967 | struct io_ring_ctx *ctx = req->ctx; |
7c86ffee | 1968 | struct io_kiocb *link; |
c9abd7ad PB |
1969 | bool cancelled = false; |
1970 | unsigned long flags; | |
7c86ffee | 1971 | |
c9abd7ad PB |
1972 | spin_lock_irqsave(&ctx->completion_lock, flags); |
1973 | link = list_first_entry_or_null(&req->link_list, struct io_kiocb, | |
1974 | link_list); | |
900fad45 PB |
1975 | /* |
1976 | * Can happen if a linked timeout fired and link had been like | |
1977 | * req -> link t-out -> link t-out [-> ...] | |
1978 | */ | |
c9abd7ad PB |
1979 | if (link && (link->flags & REQ_F_LTIMEOUT_ACTIVE)) { |
1980 | struct io_timeout_data *io = link->async_data; | |
1981 | int ret; | |
7c86ffee | 1982 | |
c9abd7ad PB |
1983 | list_del_init(&link->link_list); |
1984 | ret = hrtimer_try_to_cancel(&io->timer); | |
1985 | if (ret != -1) { | |
1986 | io_cqring_fill_event(link, -ECANCELED); | |
1987 | io_commit_cqring(ctx); | |
1988 | cancelled = true; | |
1989 | } | |
1990 | } | |
7c86ffee | 1991 | req->flags &= ~REQ_F_LINK_TIMEOUT; |
216578e5 | 1992 | spin_unlock_irqrestore(&ctx->completion_lock, flags); |
ab0b6451 | 1993 | |
c9abd7ad | 1994 | if (cancelled) { |
7c86ffee | 1995 | io_cqring_ev_posted(ctx); |
c9abd7ad PB |
1996 | io_put_req(link); |
1997 | } | |
7c86ffee PB |
1998 | } |
1999 | ||
9b5f7bd9 | 2000 | static struct io_kiocb *io_req_link_next(struct io_kiocb *req) |
7c86ffee PB |
2001 | { |
2002 | struct io_kiocb *nxt; | |
4d7dd462 | 2003 | |
9e645e11 JA |
2004 | /* |
2005 | * The list should never be empty when we are called here. But could | |
2006 | * potentially happen if the chain is messed up, check to be on the | |
2007 | * safe side. | |
2008 | */ | |
7c86ffee | 2009 | if (unlikely(list_empty(&req->link_list))) |
9b5f7bd9 | 2010 | return NULL; |
2665abfd | 2011 | |
7c86ffee PB |
2012 | nxt = list_first_entry(&req->link_list, struct io_kiocb, link_list); |
2013 | list_del_init(&req->link_list); | |
2014 | if (!list_empty(&nxt->link_list)) | |
2015 | nxt->flags |= REQ_F_LINK_HEAD; | |
9b5f7bd9 | 2016 | return nxt; |
9e645e11 JA |
2017 | } |
2018 | ||
2019 | /* | |
dea3b49c | 2020 | * Called if REQ_F_LINK_HEAD is set, and we fail the head request |
9e645e11 | 2021 | */ |
d148ca4b | 2022 | static void io_fail_links(struct io_kiocb *req) |
9e645e11 | 2023 | { |
2665abfd | 2024 | struct io_ring_ctx *ctx = req->ctx; |
d148ca4b | 2025 | unsigned long flags; |
9e645e11 | 2026 | |
d148ca4b | 2027 | spin_lock_irqsave(&ctx->completion_lock, flags); |
9e645e11 | 2028 | while (!list_empty(&req->link_list)) { |
4493233e PB |
2029 | struct io_kiocb *link = list_first_entry(&req->link_list, |
2030 | struct io_kiocb, link_list); | |
9e645e11 | 2031 | |
4493233e | 2032 | list_del_init(&link->link_list); |
c826bd7a | 2033 | trace_io_uring_fail_link(req, link); |
2665abfd | 2034 | |
7c86ffee | 2035 | io_cqring_fill_event(link, -ECANCELED); |
216578e5 PB |
2036 | |
2037 | /* | |
2038 | * It's ok to free under spinlock as they're not linked anymore, | |
2039 | * but avoid REQ_F_WORK_INITIALIZED because it may deadlock on | |
2040 | * work.fs->lock. | |
2041 | */ | |
2042 | if (link->flags & REQ_F_WORK_INITIALIZED) | |
2043 | io_put_req_deferred(link, 2); | |
2044 | else | |
2045 | io_double_put_req(link); | |
9e645e11 | 2046 | } |
2665abfd JA |
2047 | |
2048 | io_commit_cqring(ctx); | |
216578e5 | 2049 | spin_unlock_irqrestore(&ctx->completion_lock, flags); |
9e645e11 | 2050 | |
2665abfd | 2051 | io_cqring_ev_posted(ctx); |
9e645e11 JA |
2052 | } |
2053 | ||
3fa5e0f3 | 2054 | static struct io_kiocb *__io_req_find_next(struct io_kiocb *req) |
c69f8dbe | 2055 | { |
9b0d911a | 2056 | req->flags &= ~REQ_F_LINK_HEAD; |
7c86ffee PB |
2057 | if (req->flags & REQ_F_LINK_TIMEOUT) |
2058 | io_kill_linked_timeout(req); | |
944e58bf | 2059 | |
9e645e11 JA |
2060 | /* |
2061 | * If LINK is set, we have dependent requests in this chain. If we | |
2062 | * didn't fail this request, queue the first one up, moving any other | |
2063 | * dependencies to the next request. In case of failure, fail the rest | |
2064 | * of the chain. | |
2065 | */ | |
9b5f7bd9 PB |
2066 | if (likely(!(req->flags & REQ_F_FAIL_LINK))) |
2067 | return io_req_link_next(req); | |
2068 | io_fail_links(req); | |
2069 | return NULL; | |
4d7dd462 | 2070 | } |
9e645e11 | 2071 | |
3fa5e0f3 PB |
2072 | static struct io_kiocb *io_req_find_next(struct io_kiocb *req) |
2073 | { | |
2074 | if (likely(!(req->flags & REQ_F_LINK_HEAD))) | |
2075 | return NULL; | |
2076 | return __io_req_find_next(req); | |
2077 | } | |
2078 | ||
87c4311f | 2079 | static int io_req_task_work_add(struct io_kiocb *req, bool twa_signal_ok) |
c2c4c83c JA |
2080 | { |
2081 | struct task_struct *tsk = req->task; | |
2082 | struct io_ring_ctx *ctx = req->ctx; | |
91989c70 JA |
2083 | enum task_work_notify_mode notify; |
2084 | int ret; | |
c2c4c83c | 2085 | |
6200b0ae JA |
2086 | if (tsk->flags & PF_EXITING) |
2087 | return -ESRCH; | |
2088 | ||
c2c4c83c | 2089 | /* |
0ba9c9ed JA |
2090 | * SQPOLL kernel thread doesn't need notification, just a wakeup. For |
2091 | * all other cases, use TWA_SIGNAL unconditionally to ensure we're | |
2092 | * processing task_work. There's no reliable way to tell if TWA_RESUME | |
2093 | * will do the job. | |
c2c4c83c | 2094 | */ |
91989c70 | 2095 | notify = TWA_NONE; |
fd7d6de2 | 2096 | if (!(ctx->flags & IORING_SETUP_SQPOLL) && twa_signal_ok) |
c2c4c83c JA |
2097 | notify = TWA_SIGNAL; |
2098 | ||
87c4311f | 2099 | ret = task_work_add(tsk, &req->task_work, notify); |
c2c4c83c JA |
2100 | if (!ret) |
2101 | wake_up_process(tsk); | |
0ba9c9ed | 2102 | |
c2c4c83c JA |
2103 | return ret; |
2104 | } | |
2105 | ||
c40f6379 JA |
2106 | static void __io_req_task_cancel(struct io_kiocb *req, int error) |
2107 | { | |
2108 | struct io_ring_ctx *ctx = req->ctx; | |
2109 | ||
2110 | spin_lock_irq(&ctx->completion_lock); | |
2111 | io_cqring_fill_event(req, error); | |
2112 | io_commit_cqring(ctx); | |
2113 | spin_unlock_irq(&ctx->completion_lock); | |
2114 | ||
2115 | io_cqring_ev_posted(ctx); | |
2116 | req_set_fail_links(req); | |
2117 | io_double_put_req(req); | |
2118 | } | |
2119 | ||
2120 | static void io_req_task_cancel(struct callback_head *cb) | |
2121 | { | |
2122 | struct io_kiocb *req = container_of(cb, struct io_kiocb, task_work); | |
87ceb6a6 | 2123 | struct io_ring_ctx *ctx = req->ctx; |
c40f6379 JA |
2124 | |
2125 | __io_req_task_cancel(req, -ECANCELED); | |
87ceb6a6 | 2126 | percpu_ref_put(&ctx->refs); |
c40f6379 JA |
2127 | } |
2128 | ||
2129 | static void __io_req_task_submit(struct io_kiocb *req) | |
2130 | { | |
2131 | struct io_ring_ctx *ctx = req->ctx; | |
2132 | ||
c40f6379 | 2133 | if (!__io_sq_thread_acquire_mm(ctx)) { |
28cea78a | 2134 | __io_sq_thread_acquire_files(ctx); |
c40f6379 | 2135 | mutex_lock(&ctx->uring_lock); |
c1379e24 | 2136 | __io_queue_sqe(req, NULL); |
c40f6379 JA |
2137 | mutex_unlock(&ctx->uring_lock); |
2138 | } else { | |
2139 | __io_req_task_cancel(req, -EFAULT); | |
2140 | } | |
2141 | } | |
2142 | ||
2143 | static void io_req_task_submit(struct callback_head *cb) | |
2144 | { | |
2145 | struct io_kiocb *req = container_of(cb, struct io_kiocb, task_work); | |
6d816e08 | 2146 | struct io_ring_ctx *ctx = req->ctx; |
c40f6379 JA |
2147 | |
2148 | __io_req_task_submit(req); | |
6d816e08 | 2149 | percpu_ref_put(&ctx->refs); |
c40f6379 JA |
2150 | } |
2151 | ||
2152 | static void io_req_task_queue(struct io_kiocb *req) | |
2153 | { | |
c40f6379 JA |
2154 | int ret; |
2155 | ||
2156 | init_task_work(&req->task_work, io_req_task_submit); | |
6d816e08 | 2157 | percpu_ref_get(&req->ctx->refs); |
c40f6379 | 2158 | |
87c4311f | 2159 | ret = io_req_task_work_add(req, true); |
c40f6379 | 2160 | if (unlikely(ret)) { |
c2c4c83c JA |
2161 | struct task_struct *tsk; |
2162 | ||
c40f6379 JA |
2163 | init_task_work(&req->task_work, io_req_task_cancel); |
2164 | tsk = io_wq_get_task(req->ctx->io_wq); | |
91989c70 | 2165 | task_work_add(tsk, &req->task_work, TWA_NONE); |
c2c4c83c | 2166 | wake_up_process(tsk); |
c40f6379 | 2167 | } |
c40f6379 JA |
2168 | } |
2169 | ||
c3524383 | 2170 | static void io_queue_next(struct io_kiocb *req) |
c69f8dbe | 2171 | { |
9b5f7bd9 | 2172 | struct io_kiocb *nxt = io_req_find_next(req); |
944e58bf PB |
2173 | |
2174 | if (nxt) | |
906a8c3f | 2175 | io_req_task_queue(nxt); |
c69f8dbe JL |
2176 | } |
2177 | ||
c3524383 | 2178 | static void io_free_req(struct io_kiocb *req) |
7a743e22 | 2179 | { |
c3524383 PB |
2180 | io_queue_next(req); |
2181 | __io_free_req(req); | |
2182 | } | |
8766dd51 | 2183 | |
2d6500d4 PB |
2184 | struct req_batch { |
2185 | void *reqs[IO_IOPOLL_BATCH]; | |
2186 | int to_free; | |
7a743e22 | 2187 | |
5af1d13e PB |
2188 | struct task_struct *task; |
2189 | int task_refs; | |
2d6500d4 PB |
2190 | }; |
2191 | ||
5af1d13e PB |
2192 | static inline void io_init_req_batch(struct req_batch *rb) |
2193 | { | |
2194 | rb->to_free = 0; | |
2195 | rb->task_refs = 0; | |
2196 | rb->task = NULL; | |
2197 | } | |
2198 | ||
2d6500d4 PB |
2199 | static void __io_req_free_batch_flush(struct io_ring_ctx *ctx, |
2200 | struct req_batch *rb) | |
2201 | { | |
2202 | kmem_cache_free_bulk(req_cachep, rb->to_free, rb->reqs); | |
2203 | percpu_ref_put_many(&ctx->refs, rb->to_free); | |
2204 | rb->to_free = 0; | |
2205 | } | |
2206 | ||
2207 | static void io_req_free_batch_finish(struct io_ring_ctx *ctx, | |
2208 | struct req_batch *rb) | |
2209 | { | |
2210 | if (rb->to_free) | |
2211 | __io_req_free_batch_flush(ctx, rb); | |
5af1d13e | 2212 | if (rb->task) { |
d8a6df10 JA |
2213 | struct io_uring_task *tctx = rb->task->io_uring; |
2214 | ||
2215 | percpu_counter_sub(&tctx->inflight, rb->task_refs); | |
5af1d13e PB |
2216 | put_task_struct_many(rb->task, rb->task_refs); |
2217 | rb->task = NULL; | |
2218 | } | |
2d6500d4 PB |
2219 | } |
2220 | ||
2221 | static void io_req_free_batch(struct req_batch *rb, struct io_kiocb *req) | |
2222 | { | |
2223 | if (unlikely(io_is_fallback_req(req))) { | |
2224 | io_free_req(req); | |
2225 | return; | |
2226 | } | |
2227 | if (req->flags & REQ_F_LINK_HEAD) | |
2228 | io_queue_next(req); | |
2229 | ||
e3bc8e9d | 2230 | if (req->task != rb->task) { |
0f212204 | 2231 | if (rb->task) { |
d8a6df10 JA |
2232 | struct io_uring_task *tctx = rb->task->io_uring; |
2233 | ||
2234 | percpu_counter_sub(&tctx->inflight, rb->task_refs); | |
e3bc8e9d | 2235 | put_task_struct_many(rb->task, rb->task_refs); |
5af1d13e | 2236 | } |
e3bc8e9d JA |
2237 | rb->task = req->task; |
2238 | rb->task_refs = 0; | |
5af1d13e | 2239 | } |
e3bc8e9d | 2240 | rb->task_refs++; |
5af1d13e | 2241 | |
4edf20f9 | 2242 | io_dismantle_req(req); |
2d6500d4 PB |
2243 | rb->reqs[rb->to_free++] = req; |
2244 | if (unlikely(rb->to_free == ARRAY_SIZE(rb->reqs))) | |
2245 | __io_req_free_batch_flush(req->ctx, rb); | |
7a743e22 PB |
2246 | } |
2247 | ||
ba816ad6 JA |
2248 | /* |
2249 | * Drop reference to request, return next in chain (if there is one) if this | |
2250 | * was the last reference to this request. | |
2251 | */ | |
9b5f7bd9 | 2252 | static struct io_kiocb *io_put_req_find_next(struct io_kiocb *req) |
e65ef56d | 2253 | { |
9b5f7bd9 PB |
2254 | struct io_kiocb *nxt = NULL; |
2255 | ||
2a44f467 | 2256 | if (refcount_dec_and_test(&req->refs)) { |
9b5f7bd9 | 2257 | nxt = io_req_find_next(req); |
4d7dd462 | 2258 | __io_free_req(req); |
2a44f467 | 2259 | } |
9b5f7bd9 | 2260 | return nxt; |
2b188cc1 JA |
2261 | } |
2262 | ||
e65ef56d JA |
2263 | static void io_put_req(struct io_kiocb *req) |
2264 | { | |
2265 | if (refcount_dec_and_test(&req->refs)) | |
2266 | io_free_req(req); | |
2b188cc1 JA |
2267 | } |
2268 | ||
216578e5 PB |
2269 | static void io_put_req_deferred_cb(struct callback_head *cb) |
2270 | { | |
2271 | struct io_kiocb *req = container_of(cb, struct io_kiocb, task_work); | |
2272 | ||
2273 | io_free_req(req); | |
2274 | } | |
2275 | ||
2276 | static void io_free_req_deferred(struct io_kiocb *req) | |
2277 | { | |
2278 | int ret; | |
2279 | ||
2280 | init_task_work(&req->task_work, io_put_req_deferred_cb); | |
2281 | ret = io_req_task_work_add(req, true); | |
2282 | if (unlikely(ret)) { | |
2283 | struct task_struct *tsk; | |
2284 | ||
2285 | tsk = io_wq_get_task(req->ctx->io_wq); | |
91989c70 | 2286 | task_work_add(tsk, &req->task_work, TWA_NONE); |
216578e5 PB |
2287 | wake_up_process(tsk); |
2288 | } | |
2289 | } | |
2290 | ||
2291 | static inline void io_put_req_deferred(struct io_kiocb *req, int refs) | |
2292 | { | |
2293 | if (refcount_sub_and_test(refs, &req->refs)) | |
2294 | io_free_req_deferred(req); | |
2295 | } | |
2296 | ||
f4db7182 | 2297 | static struct io_wq_work *io_steal_work(struct io_kiocb *req) |
7a743e22 | 2298 | { |
6df1db6b | 2299 | struct io_kiocb *nxt; |
f4db7182 | 2300 | |
7a743e22 | 2301 | /* |
f4db7182 PB |
2302 | * A ref is owned by io-wq in which context we're. So, if that's the |
2303 | * last one, it's safe to steal next work. False negatives are Ok, | |
2304 | * it just will be re-punted async in io_put_work() | |
7a743e22 | 2305 | */ |
f4db7182 PB |
2306 | if (refcount_read(&req->refs) != 1) |
2307 | return NULL; | |
7a743e22 | 2308 | |
9b5f7bd9 | 2309 | nxt = io_req_find_next(req); |
6df1db6b | 2310 | return nxt ? &nxt->work : NULL; |
7a743e22 PB |
2311 | } |
2312 | ||
978db57e JA |
2313 | static void io_double_put_req(struct io_kiocb *req) |
2314 | { | |
2315 | /* drop both submit and complete references */ | |
2316 | if (refcount_sub_and_test(2, &req->refs)) | |
2317 | io_free_req(req); | |
2318 | } | |
2319 | ||
1d7bb1d5 | 2320 | static unsigned io_cqring_events(struct io_ring_ctx *ctx, bool noflush) |
a3a0e43f | 2321 | { |
84f97dc2 JA |
2322 | struct io_rings *rings = ctx->rings; |
2323 | ||
ad3eb2c8 JA |
2324 | if (test_bit(0, &ctx->cq_check_overflow)) { |
2325 | /* | |
2326 | * noflush == true is from the waitqueue handler, just ensure | |
2327 | * we wake up the task, and the next invocation will flush the | |
2328 | * entries. We cannot safely to it from here. | |
2329 | */ | |
2330 | if (noflush && !list_empty(&ctx->cq_overflow_list)) | |
2331 | return -1U; | |
1d7bb1d5 | 2332 | |
e6c8aa9a | 2333 | io_cqring_overflow_flush(ctx, false, NULL, NULL); |
ad3eb2c8 | 2334 | } |
1d7bb1d5 | 2335 | |
a3a0e43f JA |
2336 | /* See comment at the top of this file */ |
2337 | smp_rmb(); | |
ad3eb2c8 | 2338 | return ctx->cached_cq_tail - READ_ONCE(rings->cq.head); |
a3a0e43f JA |
2339 | } |
2340 | ||
fb5ccc98 PB |
2341 | static inline unsigned int io_sqring_entries(struct io_ring_ctx *ctx) |
2342 | { | |
2343 | struct io_rings *rings = ctx->rings; | |
2344 | ||
2345 | /* make sure SQ entry isn't read before tail */ | |
2346 | return smp_load_acquire(&rings->sq.tail) - ctx->cached_sq_head; | |
2347 | } | |
2348 | ||
8ff069bf | 2349 | static unsigned int io_put_kbuf(struct io_kiocb *req, struct io_buffer *kbuf) |
e94f141b | 2350 | { |
8ff069bf | 2351 | unsigned int cflags; |
e94f141b | 2352 | |
bcda7baa JA |
2353 | cflags = kbuf->bid << IORING_CQE_BUFFER_SHIFT; |
2354 | cflags |= IORING_CQE_F_BUFFER; | |
0e1b6fe3 | 2355 | req->flags &= ~REQ_F_BUFFER_SELECTED; |
bcda7baa JA |
2356 | kfree(kbuf); |
2357 | return cflags; | |
e94f141b JA |
2358 | } |
2359 | ||
8ff069bf | 2360 | static inline unsigned int io_put_rw_kbuf(struct io_kiocb *req) |
bcda7baa | 2361 | { |
4d954c25 | 2362 | struct io_buffer *kbuf; |
bcda7baa | 2363 | |
4d954c25 | 2364 | kbuf = (struct io_buffer *) (unsigned long) req->rw.addr; |
8ff069bf PB |
2365 | return io_put_kbuf(req, kbuf); |
2366 | } | |
2367 | ||
4c6e277c JA |
2368 | static inline bool io_run_task_work(void) |
2369 | { | |
6200b0ae JA |
2370 | /* |
2371 | * Not safe to run on exiting task, and the task_work handling will | |
2372 | * not add work to such a task. | |
2373 | */ | |
2374 | if (unlikely(current->flags & PF_EXITING)) | |
2375 | return false; | |
4c6e277c JA |
2376 | if (current->task_works) { |
2377 | __set_current_state(TASK_RUNNING); | |
2378 | task_work_run(); | |
2379 | return true; | |
2380 | } | |
2381 | ||
2382 | return false; | |
bcda7baa JA |
2383 | } |
2384 | ||
bbde017a XW |
2385 | static void io_iopoll_queue(struct list_head *again) |
2386 | { | |
2387 | struct io_kiocb *req; | |
2388 | ||
2389 | do { | |
d21ffe7e PB |
2390 | req = list_first_entry(again, struct io_kiocb, inflight_entry); |
2391 | list_del(&req->inflight_entry); | |
81b68a5c | 2392 | __io_complete_rw(req, -EAGAIN, 0, NULL); |
bbde017a XW |
2393 | } while (!list_empty(again)); |
2394 | } | |
2395 | ||
def596e9 JA |
2396 | /* |
2397 | * Find and free completed poll iocbs | |
2398 | */ | |
2399 | static void io_iopoll_complete(struct io_ring_ctx *ctx, unsigned int *nr_events, | |
2400 | struct list_head *done) | |
2401 | { | |
8237e045 | 2402 | struct req_batch rb; |
def596e9 | 2403 | struct io_kiocb *req; |
bbde017a XW |
2404 | LIST_HEAD(again); |
2405 | ||
2406 | /* order with ->result store in io_complete_rw_iopoll() */ | |
2407 | smp_rmb(); | |
def596e9 | 2408 | |
5af1d13e | 2409 | io_init_req_batch(&rb); |
def596e9 | 2410 | while (!list_empty(done)) { |
bcda7baa JA |
2411 | int cflags = 0; |
2412 | ||
d21ffe7e | 2413 | req = list_first_entry(done, struct io_kiocb, inflight_entry); |
bbde017a | 2414 | if (READ_ONCE(req->result) == -EAGAIN) { |
56450c20 | 2415 | req->result = 0; |
bbde017a | 2416 | req->iopoll_completed = 0; |
d21ffe7e | 2417 | list_move_tail(&req->inflight_entry, &again); |
bbde017a XW |
2418 | continue; |
2419 | } | |
d21ffe7e | 2420 | list_del(&req->inflight_entry); |
def596e9 | 2421 | |
bcda7baa | 2422 | if (req->flags & REQ_F_BUFFER_SELECTED) |
8ff069bf | 2423 | cflags = io_put_rw_kbuf(req); |
bcda7baa JA |
2424 | |
2425 | __io_cqring_fill_event(req, req->result, cflags); | |
def596e9 JA |
2426 | (*nr_events)++; |
2427 | ||
c3524383 | 2428 | if (refcount_dec_and_test(&req->refs)) |
2d6500d4 | 2429 | io_req_free_batch(&rb, req); |
def596e9 | 2430 | } |
def596e9 | 2431 | |
09bb8394 | 2432 | io_commit_cqring(ctx); |
32b2244a XW |
2433 | if (ctx->flags & IORING_SETUP_SQPOLL) |
2434 | io_cqring_ev_posted(ctx); | |
2d6500d4 | 2435 | io_req_free_batch_finish(ctx, &rb); |
581f9810 | 2436 | |
bbde017a XW |
2437 | if (!list_empty(&again)) |
2438 | io_iopoll_queue(&again); | |
581f9810 BM |
2439 | } |
2440 | ||
def596e9 JA |
2441 | static int io_do_iopoll(struct io_ring_ctx *ctx, unsigned int *nr_events, |
2442 | long min) | |
2443 | { | |
2444 | struct io_kiocb *req, *tmp; | |
2445 | LIST_HEAD(done); | |
2446 | bool spin; | |
2447 | int ret; | |
2448 | ||
2449 | /* | |
2450 | * Only spin for completions if we don't have multiple devices hanging | |
2451 | * off our complete list, and we're under the requested amount. | |
2452 | */ | |
2453 | spin = !ctx->poll_multi_file && *nr_events < min; | |
2454 | ||
2455 | ret = 0; | |
d21ffe7e | 2456 | list_for_each_entry_safe(req, tmp, &ctx->iopoll_list, inflight_entry) { |
9adbd45d | 2457 | struct kiocb *kiocb = &req->rw.kiocb; |
def596e9 JA |
2458 | |
2459 | /* | |
581f9810 BM |
2460 | * Move completed and retryable entries to our local lists. |
2461 | * If we find a request that requires polling, break out | |
2462 | * and complete those lists first, if we have entries there. | |
def596e9 | 2463 | */ |
65a6543d | 2464 | if (READ_ONCE(req->iopoll_completed)) { |
d21ffe7e | 2465 | list_move_tail(&req->inflight_entry, &done); |
def596e9 JA |
2466 | continue; |
2467 | } | |
2468 | if (!list_empty(&done)) | |
2469 | break; | |
2470 | ||
2471 | ret = kiocb->ki_filp->f_op->iopoll(kiocb, spin); | |
2472 | if (ret < 0) | |
2473 | break; | |
2474 | ||
3aadc23e PB |
2475 | /* iopoll may have completed current req */ |
2476 | if (READ_ONCE(req->iopoll_completed)) | |
d21ffe7e | 2477 | list_move_tail(&req->inflight_entry, &done); |
3aadc23e | 2478 | |
def596e9 JA |
2479 | if (ret && spin) |
2480 | spin = false; | |
2481 | ret = 0; | |
2482 | } | |
2483 | ||
2484 | if (!list_empty(&done)) | |
2485 | io_iopoll_complete(ctx, nr_events, &done); | |
2486 | ||
2487 | return ret; | |
2488 | } | |
2489 | ||
2490 | /* | |
d195a66e | 2491 | * Poll for a minimum of 'min' events. Note that if min == 0 we consider that a |
def596e9 JA |
2492 | * non-spinning poll check - we'll still enter the driver poll loop, but only |
2493 | * as a non-spinning completion check. | |
2494 | */ | |
2495 | static int io_iopoll_getevents(struct io_ring_ctx *ctx, unsigned int *nr_events, | |
2496 | long min) | |
2497 | { | |
540e32a0 | 2498 | while (!list_empty(&ctx->iopoll_list) && !need_resched()) { |
def596e9 JA |
2499 | int ret; |
2500 | ||
2501 | ret = io_do_iopoll(ctx, nr_events, min); | |
2502 | if (ret < 0) | |
2503 | return ret; | |
eba0a4dd | 2504 | if (*nr_events >= min) |
def596e9 JA |
2505 | return 0; |
2506 | } | |
2507 | ||
2508 | return 1; | |
2509 | } | |
2510 | ||
2511 | /* | |
2512 | * We can't just wait for polled events to come to us, we have to actively | |
2513 | * find and complete them. | |
2514 | */ | |
b2edc0a7 | 2515 | static void io_iopoll_try_reap_events(struct io_ring_ctx *ctx) |
def596e9 JA |
2516 | { |
2517 | if (!(ctx->flags & IORING_SETUP_IOPOLL)) | |
2518 | return; | |
2519 | ||
2520 | mutex_lock(&ctx->uring_lock); | |
540e32a0 | 2521 | while (!list_empty(&ctx->iopoll_list)) { |
def596e9 JA |
2522 | unsigned int nr_events = 0; |
2523 | ||
b2edc0a7 | 2524 | io_do_iopoll(ctx, &nr_events, 0); |
08f5439f | 2525 | |
b2edc0a7 PB |
2526 | /* let it sleep and repeat later if can't complete a request */ |
2527 | if (nr_events == 0) | |
2528 | break; | |
08f5439f JA |
2529 | /* |
2530 | * Ensure we allow local-to-the-cpu processing to take place, | |
2531 | * in this case we need to ensure that we reap all events. | |
3fcee5a6 | 2532 | * Also let task_work, etc. to progress by releasing the mutex |
08f5439f | 2533 | */ |
3fcee5a6 PB |
2534 | if (need_resched()) { |
2535 | mutex_unlock(&ctx->uring_lock); | |
2536 | cond_resched(); | |
2537 | mutex_lock(&ctx->uring_lock); | |
2538 | } | |
def596e9 JA |
2539 | } |
2540 | mutex_unlock(&ctx->uring_lock); | |
2541 | } | |
2542 | ||
7668b92a | 2543 | static int io_iopoll_check(struct io_ring_ctx *ctx, long min) |
def596e9 | 2544 | { |
7668b92a | 2545 | unsigned int nr_events = 0; |
2b2ed975 | 2546 | int iters = 0, ret = 0; |
500f9fba | 2547 | |
c7849be9 XW |
2548 | /* |
2549 | * We disallow the app entering submit/complete with polling, but we | |
2550 | * still need to lock the ring to prevent racing with polled issue | |
2551 | * that got punted to a workqueue. | |
2552 | */ | |
2553 | mutex_lock(&ctx->uring_lock); | |
def596e9 | 2554 | do { |
a3a0e43f JA |
2555 | /* |
2556 | * Don't enter poll loop if we already have events pending. | |
2557 | * If we do, we can potentially be spinning for commands that | |
2558 | * already triggered a CQE (eg in error). | |
2559 | */ | |
1d7bb1d5 | 2560 | if (io_cqring_events(ctx, false)) |
a3a0e43f JA |
2561 | break; |
2562 | ||
500f9fba JA |
2563 | /* |
2564 | * If a submit got punted to a workqueue, we can have the | |
2565 | * application entering polling for a command before it gets | |
2566 | * issued. That app will hold the uring_lock for the duration | |
2567 | * of the poll right here, so we need to take a breather every | |
2568 | * now and then to ensure that the issue has a chance to add | |
2569 | * the poll to the issued list. Otherwise we can spin here | |
2570 | * forever, while the workqueue is stuck trying to acquire the | |
2571 | * very same mutex. | |
2572 | */ | |
2573 | if (!(++iters & 7)) { | |
2574 | mutex_unlock(&ctx->uring_lock); | |
4c6e277c | 2575 | io_run_task_work(); |
500f9fba JA |
2576 | mutex_lock(&ctx->uring_lock); |
2577 | } | |
2578 | ||
7668b92a | 2579 | ret = io_iopoll_getevents(ctx, &nr_events, min); |
def596e9 JA |
2580 | if (ret <= 0) |
2581 | break; | |
2582 | ret = 0; | |
7668b92a | 2583 | } while (min && !nr_events && !need_resched()); |
def596e9 | 2584 | |
500f9fba | 2585 | mutex_unlock(&ctx->uring_lock); |
def596e9 JA |
2586 | return ret; |
2587 | } | |
2588 | ||
491381ce | 2589 | static void kiocb_end_write(struct io_kiocb *req) |
2b188cc1 | 2590 | { |
491381ce JA |
2591 | /* |
2592 | * Tell lockdep we inherited freeze protection from submission | |
2593 | * thread. | |
2594 | */ | |
2595 | if (req->flags & REQ_F_ISREG) { | |
2596 | struct inode *inode = file_inode(req->file); | |
2b188cc1 | 2597 | |
491381ce | 2598 | __sb_writers_acquired(inode->i_sb, SB_FREEZE_WRITE); |
2b188cc1 | 2599 | } |
491381ce | 2600 | file_end_write(req->file); |
2b188cc1 JA |
2601 | } |
2602 | ||
a1d7c393 JA |
2603 | static void io_complete_rw_common(struct kiocb *kiocb, long res, |
2604 | struct io_comp_state *cs) | |
2b188cc1 | 2605 | { |
9adbd45d | 2606 | struct io_kiocb *req = container_of(kiocb, struct io_kiocb, rw.kiocb); |
bcda7baa | 2607 | int cflags = 0; |
2b188cc1 | 2608 | |
491381ce JA |
2609 | if (kiocb->ki_flags & IOCB_WRITE) |
2610 | kiocb_end_write(req); | |
2b188cc1 | 2611 | |
4e88d6e7 JA |
2612 | if (res != req->result) |
2613 | req_set_fail_links(req); | |
bcda7baa | 2614 | if (req->flags & REQ_F_BUFFER_SELECTED) |
8ff069bf | 2615 | cflags = io_put_rw_kbuf(req); |
a1d7c393 | 2616 | __io_req_complete(req, res, cflags, cs); |
ba816ad6 JA |
2617 | } |
2618 | ||
b63534c4 JA |
2619 | #ifdef CONFIG_BLOCK |
2620 | static bool io_resubmit_prep(struct io_kiocb *req, int error) | |
2621 | { | |
2622 | struct iovec inline_vecs[UIO_FASTIOV], *iovec = inline_vecs; | |
2623 | ssize_t ret = -ECANCELED; | |
2624 | struct iov_iter iter; | |
2625 | int rw; | |
2626 | ||
2627 | if (error) { | |
2628 | ret = error; | |
2629 | goto end_req; | |
2630 | } | |
2631 | ||
2632 | switch (req->opcode) { | |
2633 | case IORING_OP_READV: | |
2634 | case IORING_OP_READ_FIXED: | |
2635 | case IORING_OP_READ: | |
2636 | rw = READ; | |
2637 | break; | |
2638 | case IORING_OP_WRITEV: | |
2639 | case IORING_OP_WRITE_FIXED: | |
2640 | case IORING_OP_WRITE: | |
2641 | rw = WRITE; | |
2642 | break; | |
2643 | default: | |
2644 | printk_once(KERN_WARNING "io_uring: bad opcode in resubmit %d\n", | |
2645 | req->opcode); | |
2646 | goto end_req; | |
2647 | } | |
2648 | ||
e8c2bc1f | 2649 | if (!req->async_data) { |
8f3d7496 JA |
2650 | ret = io_import_iovec(rw, req, &iovec, &iter, false); |
2651 | if (ret < 0) | |
2652 | goto end_req; | |
2653 | ret = io_setup_async_rw(req, iovec, inline_vecs, &iter, false); | |
2654 | if (!ret) | |
2655 | return true; | |
2656 | kfree(iovec); | |
2657 | } else { | |
b63534c4 | 2658 | return true; |
8f3d7496 | 2659 | } |
b63534c4 | 2660 | end_req: |
b63534c4 | 2661 | req_set_fail_links(req); |
b63534c4 JA |
2662 | return false; |
2663 | } | |
b63534c4 JA |
2664 | #endif |
2665 | ||
2666 | static bool io_rw_reissue(struct io_kiocb *req, long res) | |
2667 | { | |
2668 | #ifdef CONFIG_BLOCK | |
355afaeb | 2669 | umode_t mode = file_inode(req->file)->i_mode; |
b63534c4 JA |
2670 | int ret; |
2671 | ||
355afaeb JA |
2672 | if (!S_ISBLK(mode) && !S_ISREG(mode)) |
2673 | return false; | |
b63534c4 JA |
2674 | if ((res != -EAGAIN && res != -EOPNOTSUPP) || io_wq_current_is_worker()) |
2675 | return false; | |
2676 | ||
28cea78a | 2677 | ret = io_sq_thread_acquire_mm_files(req->ctx, req); |
6d816e08 | 2678 | |
fdee946d JA |
2679 | if (io_resubmit_prep(req, ret)) { |
2680 | refcount_inc(&req->refs); | |
2681 | io_queue_async_work(req); | |
b63534c4 | 2682 | return true; |
fdee946d JA |
2683 | } |
2684 | ||
b63534c4 JA |
2685 | #endif |
2686 | return false; | |
2687 | } | |
2688 | ||
a1d7c393 JA |
2689 | static void __io_complete_rw(struct io_kiocb *req, long res, long res2, |
2690 | struct io_comp_state *cs) | |
2691 | { | |
2692 | if (!io_rw_reissue(req, res)) | |
2693 | io_complete_rw_common(&req->rw.kiocb, res, cs); | |
ba816ad6 JA |
2694 | } |
2695 | ||
2696 | static void io_complete_rw(struct kiocb *kiocb, long res, long res2) | |
2697 | { | |
9adbd45d | 2698 | struct io_kiocb *req = container_of(kiocb, struct io_kiocb, rw.kiocb); |
ba816ad6 | 2699 | |
a1d7c393 | 2700 | __io_complete_rw(req, res, res2, NULL); |
2b188cc1 JA |
2701 | } |
2702 | ||
def596e9 JA |
2703 | static void io_complete_rw_iopoll(struct kiocb *kiocb, long res, long res2) |
2704 | { | |
9adbd45d | 2705 | struct io_kiocb *req = container_of(kiocb, struct io_kiocb, rw.kiocb); |
def596e9 | 2706 | |
491381ce JA |
2707 | if (kiocb->ki_flags & IOCB_WRITE) |
2708 | kiocb_end_write(req); | |
def596e9 | 2709 | |
2d7d6792 | 2710 | if (res != -EAGAIN && res != req->result) |
4e88d6e7 | 2711 | req_set_fail_links(req); |
bbde017a XW |
2712 | |
2713 | WRITE_ONCE(req->result, res); | |
2714 | /* order with io_poll_complete() checking ->result */ | |
cd664b0e PB |
2715 | smp_wmb(); |
2716 | WRITE_ONCE(req->iopoll_completed, 1); | |
def596e9 JA |
2717 | } |
2718 | ||
2719 | /* | |
2720 | * After the iocb has been issued, it's safe to be found on the poll list. | |
2721 | * Adding the kiocb to the list AFTER submission ensures that we don't | |
2722 | * find it from a io_iopoll_getevents() thread before the issuer is done | |
2723 | * accessing the kiocb cookie. | |
2724 | */ | |
2725 | static void io_iopoll_req_issued(struct io_kiocb *req) | |
2726 | { | |
2727 | struct io_ring_ctx *ctx = req->ctx; | |
2728 | ||
2729 | /* | |
2730 | * Track whether we have multiple files in our lists. This will impact | |
2731 | * how we do polling eventually, not spinning if we're on potentially | |
2732 | * different devices. | |
2733 | */ | |
540e32a0 | 2734 | if (list_empty(&ctx->iopoll_list)) { |
def596e9 JA |
2735 | ctx->poll_multi_file = false; |
2736 | } else if (!ctx->poll_multi_file) { | |
2737 | struct io_kiocb *list_req; | |
2738 | ||
540e32a0 | 2739 | list_req = list_first_entry(&ctx->iopoll_list, struct io_kiocb, |
d21ffe7e | 2740 | inflight_entry); |
9adbd45d | 2741 | if (list_req->file != req->file) |
def596e9 JA |
2742 | ctx->poll_multi_file = true; |
2743 | } | |
2744 | ||
2745 | /* | |
2746 | * For fast devices, IO may have already completed. If it has, add | |
2747 | * it to the front so we find it first. | |
2748 | */ | |
65a6543d | 2749 | if (READ_ONCE(req->iopoll_completed)) |
d21ffe7e | 2750 | list_add(&req->inflight_entry, &ctx->iopoll_list); |
def596e9 | 2751 | else |
d21ffe7e | 2752 | list_add_tail(&req->inflight_entry, &ctx->iopoll_list); |
bdcd3eab XW |
2753 | |
2754 | if ((ctx->flags & IORING_SETUP_SQPOLL) && | |
534ca6d6 JA |
2755 | wq_has_sleeper(&ctx->sq_data->wait)) |
2756 | wake_up(&ctx->sq_data->wait); | |
def596e9 JA |
2757 | } |
2758 | ||
9f13c35b | 2759 | static void __io_state_file_put(struct io_submit_state *state) |
9a56a232 | 2760 | { |
06ef3608 PB |
2761 | if (state->has_refs) |
2762 | fput_many(state->file, state->has_refs); | |
9f13c35b PB |
2763 | state->file = NULL; |
2764 | } | |
2765 | ||
2766 | static inline void io_state_file_put(struct io_submit_state *state) | |
2767 | { | |
2768 | if (state->file) | |
2769 | __io_state_file_put(state); | |
9a56a232 JA |
2770 | } |
2771 | ||
2772 | /* | |
2773 | * Get as many references to a file as we have IOs left in this submission, | |
2774 | * assuming most submissions are for one file, or at least that each file | |
2775 | * has more than one submission. | |
2776 | */ | |
8da11c19 | 2777 | static struct file *__io_file_get(struct io_submit_state *state, int fd) |
9a56a232 JA |
2778 | { |
2779 | if (!state) | |
2780 | return fget(fd); | |
2781 | ||
2782 | if (state->file) { | |
2783 | if (state->fd == fd) { | |
06ef3608 | 2784 | state->has_refs--; |
9a56a232 JA |
2785 | return state->file; |
2786 | } | |
9f13c35b | 2787 | __io_state_file_put(state); |
9a56a232 JA |
2788 | } |
2789 | state->file = fget_many(fd, state->ios_left); | |
2790 | if (!state->file) | |
2791 | return NULL; | |
2792 | ||
2793 | state->fd = fd; | |
71b547c0 | 2794 | state->has_refs = state->ios_left - 1; |
9a56a232 JA |
2795 | return state->file; |
2796 | } | |
2797 | ||
4503b767 JA |
2798 | static bool io_bdev_nowait(struct block_device *bdev) |
2799 | { | |
2800 | #ifdef CONFIG_BLOCK | |
9ba0d0c8 | 2801 | return !bdev || blk_queue_nowait(bdev_get_queue(bdev)); |
4503b767 JA |
2802 | #else |
2803 | return true; | |
2804 | #endif | |
2805 | } | |
2806 | ||
2b188cc1 JA |
2807 | /* |
2808 | * If we tracked the file through the SCM inflight mechanism, we could support | |
2809 | * any file. For now, just ensure that anything potentially problematic is done | |
2810 | * inline. | |
2811 | */ | |
af197f50 | 2812 | static bool io_file_supports_async(struct file *file, int rw) |
2b188cc1 JA |
2813 | { |
2814 | umode_t mode = file_inode(file)->i_mode; | |
2815 | ||
4503b767 JA |
2816 | if (S_ISBLK(mode)) { |
2817 | if (io_bdev_nowait(file->f_inode->i_bdev)) | |
2818 | return true; | |
2819 | return false; | |
2820 | } | |
2821 | if (S_ISCHR(mode) || S_ISSOCK(mode)) | |
2b188cc1 | 2822 | return true; |
4503b767 JA |
2823 | if (S_ISREG(mode)) { |
2824 | if (io_bdev_nowait(file->f_inode->i_sb->s_bdev) && | |
2825 | file->f_op != &io_uring_fops) | |
2826 | return true; | |
2827 | return false; | |
2828 | } | |
2b188cc1 | 2829 | |
c5b85625 JA |
2830 | /* any ->read/write should understand O_NONBLOCK */ |
2831 | if (file->f_flags & O_NONBLOCK) | |
2832 | return true; | |
2833 | ||
af197f50 JA |
2834 | if (!(file->f_mode & FMODE_NOWAIT)) |
2835 | return false; | |
2836 | ||
2837 | if (rw == READ) | |
2838 | return file->f_op->read_iter != NULL; | |
2839 | ||
2840 | return file->f_op->write_iter != NULL; | |
2b188cc1 JA |
2841 | } |
2842 | ||
a88fc400 | 2843 | static int io_prep_rw(struct io_kiocb *req, const struct io_uring_sqe *sqe) |
2b188cc1 | 2844 | { |
def596e9 | 2845 | struct io_ring_ctx *ctx = req->ctx; |
9adbd45d | 2846 | struct kiocb *kiocb = &req->rw.kiocb; |
09bb8394 JA |
2847 | unsigned ioprio; |
2848 | int ret; | |
2b188cc1 | 2849 | |
491381ce JA |
2850 | if (S_ISREG(file_inode(req->file)->i_mode)) |
2851 | req->flags |= REQ_F_ISREG; | |
2852 | ||
2b188cc1 | 2853 | kiocb->ki_pos = READ_ONCE(sqe->off); |
ba04291e JA |
2854 | if (kiocb->ki_pos == -1 && !(req->file->f_mode & FMODE_STREAM)) { |
2855 | req->flags |= REQ_F_CUR_POS; | |
2856 | kiocb->ki_pos = req->file->f_pos; | |
2857 | } | |
2b188cc1 | 2858 | kiocb->ki_hint = ki_hint_validate(file_write_hint(kiocb->ki_filp)); |
3e577dcd PB |
2859 | kiocb->ki_flags = iocb_flags(kiocb->ki_filp); |
2860 | ret = kiocb_set_rw_flags(kiocb, READ_ONCE(sqe->rw_flags)); | |
2861 | if (unlikely(ret)) | |
2862 | return ret; | |
2b188cc1 JA |
2863 | |
2864 | ioprio = READ_ONCE(sqe->ioprio); | |
2865 | if (ioprio) { | |
2866 | ret = ioprio_check_cap(ioprio); | |
2867 | if (ret) | |
09bb8394 | 2868 | return ret; |
2b188cc1 JA |
2869 | |
2870 | kiocb->ki_ioprio = ioprio; | |
2871 | } else | |
2872 | kiocb->ki_ioprio = get_current_ioprio(); | |
2873 | ||
8449eeda | 2874 | /* don't allow async punt if RWF_NOWAIT was requested */ |
c5b85625 | 2875 | if (kiocb->ki_flags & IOCB_NOWAIT) |
8449eeda SB |
2876 | req->flags |= REQ_F_NOWAIT; |
2877 | ||
def596e9 | 2878 | if (ctx->flags & IORING_SETUP_IOPOLL) { |
def596e9 JA |
2879 | if (!(kiocb->ki_flags & IOCB_DIRECT) || |
2880 | !kiocb->ki_filp->f_op->iopoll) | |
09bb8394 | 2881 | return -EOPNOTSUPP; |
2b188cc1 | 2882 | |
def596e9 JA |
2883 | kiocb->ki_flags |= IOCB_HIPRI; |
2884 | kiocb->ki_complete = io_complete_rw_iopoll; | |
65a6543d | 2885 | req->iopoll_completed = 0; |
def596e9 | 2886 | } else { |
09bb8394 JA |
2887 | if (kiocb->ki_flags & IOCB_HIPRI) |
2888 | return -EINVAL; | |
def596e9 JA |
2889 | kiocb->ki_complete = io_complete_rw; |
2890 | } | |
9adbd45d | 2891 | |
3529d8c2 JA |
2892 | req->rw.addr = READ_ONCE(sqe->addr); |
2893 | req->rw.len = READ_ONCE(sqe->len); | |
4f4eeba8 | 2894 | req->buf_index = READ_ONCE(sqe->buf_index); |
2b188cc1 | 2895 | return 0; |
2b188cc1 JA |
2896 | } |
2897 | ||
2898 | static inline void io_rw_done(struct kiocb *kiocb, ssize_t ret) | |
2899 | { | |
2900 | switch (ret) { | |
2901 | case -EIOCBQUEUED: | |
2902 | break; | |
2903 | case -ERESTARTSYS: | |
2904 | case -ERESTARTNOINTR: | |
2905 | case -ERESTARTNOHAND: | |
2906 | case -ERESTART_RESTARTBLOCK: | |
2907 | /* | |
2908 | * We can't just restart the syscall, since previously | |
2909 | * submitted sqes may already be in progress. Just fail this | |
2910 | * IO with EINTR. | |
2911 | */ | |
2912 | ret = -EINTR; | |
df561f66 | 2913 | fallthrough; |
2b188cc1 JA |
2914 | default: |
2915 | kiocb->ki_complete(kiocb, ret, 0); | |
2916 | } | |
2917 | } | |
2918 | ||
a1d7c393 JA |
2919 | static void kiocb_done(struct kiocb *kiocb, ssize_t ret, |
2920 | struct io_comp_state *cs) | |
ba816ad6 | 2921 | { |
ba04291e | 2922 | struct io_kiocb *req = container_of(kiocb, struct io_kiocb, rw.kiocb); |
e8c2bc1f | 2923 | struct io_async_rw *io = req->async_data; |
ba04291e | 2924 | |
227c0c96 | 2925 | /* add previously done IO, if any */ |
e8c2bc1f | 2926 | if (io && io->bytes_done > 0) { |
227c0c96 | 2927 | if (ret < 0) |
e8c2bc1f | 2928 | ret = io->bytes_done; |
227c0c96 | 2929 | else |
e8c2bc1f | 2930 | ret += io->bytes_done; |
227c0c96 JA |
2931 | } |
2932 | ||
ba04291e JA |
2933 | if (req->flags & REQ_F_CUR_POS) |
2934 | req->file->f_pos = kiocb->ki_pos; | |
bcaec089 | 2935 | if (ret >= 0 && kiocb->ki_complete == io_complete_rw) |
a1d7c393 | 2936 | __io_complete_rw(req, ret, 0, cs); |
ba816ad6 JA |
2937 | else |
2938 | io_rw_done(kiocb, ret); | |
2939 | } | |
2940 | ||
9adbd45d | 2941 | static ssize_t io_import_fixed(struct io_kiocb *req, int rw, |
7d009165 | 2942 | struct iov_iter *iter) |
edafccee | 2943 | { |
9adbd45d JA |
2944 | struct io_ring_ctx *ctx = req->ctx; |
2945 | size_t len = req->rw.len; | |
edafccee | 2946 | struct io_mapped_ubuf *imu; |
4be1c615 | 2947 | u16 index, buf_index = req->buf_index; |
edafccee JA |
2948 | size_t offset; |
2949 | u64 buf_addr; | |
2950 | ||
edafccee JA |
2951 | if (unlikely(buf_index >= ctx->nr_user_bufs)) |
2952 | return -EFAULT; | |
edafccee JA |
2953 | index = array_index_nospec(buf_index, ctx->nr_user_bufs); |
2954 | imu = &ctx->user_bufs[index]; | |
9adbd45d | 2955 | buf_addr = req->rw.addr; |
edafccee JA |
2956 | |
2957 | /* overflow */ | |
2958 | if (buf_addr + len < buf_addr) | |
2959 | return -EFAULT; | |
2960 | /* not inside the mapped region */ | |
2961 | if (buf_addr < imu->ubuf || buf_addr + len > imu->ubuf + imu->len) | |
2962 | return -EFAULT; | |
2963 | ||
2964 | /* | |
2965 | * May not be a start of buffer, set size appropriately | |
2966 | * and advance us to the beginning. | |
2967 | */ | |
2968 | offset = buf_addr - imu->ubuf; | |
2969 | iov_iter_bvec(iter, rw, imu->bvec, imu->nr_bvecs, offset + len); | |
bd11b3a3 JA |
2970 | |
2971 | if (offset) { | |
2972 | /* | |
2973 | * Don't use iov_iter_advance() here, as it's really slow for | |
2974 | * using the latter parts of a big fixed buffer - it iterates | |
2975 | * over each segment manually. We can cheat a bit here, because | |
2976 | * we know that: | |
2977 | * | |
2978 | * 1) it's a BVEC iter, we set it up | |
2979 | * 2) all bvecs are PAGE_SIZE in size, except potentially the | |
2980 | * first and last bvec | |
2981 | * | |
2982 | * So just find our index, and adjust the iterator afterwards. | |
2983 | * If the offset is within the first bvec (or the whole first | |
2984 | * bvec, just use iov_iter_advance(). This makes it easier | |
2985 | * since we can just skip the first segment, which may not | |
2986 | * be PAGE_SIZE aligned. | |
2987 | */ | |
2988 | const struct bio_vec *bvec = imu->bvec; | |
2989 | ||
2990 | if (offset <= bvec->bv_len) { | |
2991 | iov_iter_advance(iter, offset); | |
2992 | } else { | |
2993 | unsigned long seg_skip; | |
2994 | ||
2995 | /* skip first vec */ | |
2996 | offset -= bvec->bv_len; | |
2997 | seg_skip = 1 + (offset >> PAGE_SHIFT); | |
2998 | ||
2999 | iter->bvec = bvec + seg_skip; | |
3000 | iter->nr_segs -= seg_skip; | |
99c79f66 | 3001 | iter->count -= bvec->bv_len + offset; |
bd11b3a3 | 3002 | iter->iov_offset = offset & ~PAGE_MASK; |
bd11b3a3 JA |
3003 | } |
3004 | } | |
3005 | ||
5e559561 | 3006 | return len; |
edafccee JA |
3007 | } |
3008 | ||
bcda7baa JA |
3009 | static void io_ring_submit_unlock(struct io_ring_ctx *ctx, bool needs_lock) |
3010 | { | |
3011 | if (needs_lock) | |
3012 | mutex_unlock(&ctx->uring_lock); | |
3013 | } | |
3014 | ||
3015 | static void io_ring_submit_lock(struct io_ring_ctx *ctx, bool needs_lock) | |
3016 | { | |
3017 | /* | |
3018 | * "Normal" inline submissions always hold the uring_lock, since we | |
3019 | * grab it from the system call. Same is true for the SQPOLL offload. | |
3020 | * The only exception is when we've detached the request and issue it | |
3021 | * from an async worker thread, grab the lock for that case. | |
3022 | */ | |
3023 | if (needs_lock) | |
3024 | mutex_lock(&ctx->uring_lock); | |
3025 | } | |
3026 | ||
3027 | static struct io_buffer *io_buffer_select(struct io_kiocb *req, size_t *len, | |
3028 | int bgid, struct io_buffer *kbuf, | |
3029 | bool needs_lock) | |
3030 | { | |
3031 | struct io_buffer *head; | |
3032 | ||
3033 | if (req->flags & REQ_F_BUFFER_SELECTED) | |
3034 | return kbuf; | |
3035 | ||
3036 | io_ring_submit_lock(req->ctx, needs_lock); | |
3037 | ||
3038 | lockdep_assert_held(&req->ctx->uring_lock); | |
3039 | ||
3040 | head = idr_find(&req->ctx->io_buffer_idr, bgid); | |
3041 | if (head) { | |
3042 | if (!list_empty(&head->list)) { | |
3043 | kbuf = list_last_entry(&head->list, struct io_buffer, | |
3044 | list); | |
3045 | list_del(&kbuf->list); | |
3046 | } else { | |
3047 | kbuf = head; | |
3048 | idr_remove(&req->ctx->io_buffer_idr, bgid); | |
3049 | } | |
3050 | if (*len > kbuf->len) | |
3051 | *len = kbuf->len; | |
3052 | } else { | |
3053 | kbuf = ERR_PTR(-ENOBUFS); | |
3054 | } | |
3055 | ||
3056 | io_ring_submit_unlock(req->ctx, needs_lock); | |
3057 | ||
3058 | return kbuf; | |
3059 | } | |
3060 | ||
4d954c25 JA |
3061 | static void __user *io_rw_buffer_select(struct io_kiocb *req, size_t *len, |
3062 | bool needs_lock) | |
3063 | { | |
3064 | struct io_buffer *kbuf; | |
4f4eeba8 | 3065 | u16 bgid; |
4d954c25 JA |
3066 | |
3067 | kbuf = (struct io_buffer *) (unsigned long) req->rw.addr; | |
4f4eeba8 | 3068 | bgid = req->buf_index; |
4d954c25 JA |
3069 | kbuf = io_buffer_select(req, len, bgid, kbuf, needs_lock); |
3070 | if (IS_ERR(kbuf)) | |
3071 | return kbuf; | |
3072 | req->rw.addr = (u64) (unsigned long) kbuf; | |
3073 | req->flags |= REQ_F_BUFFER_SELECTED; | |
3074 | return u64_to_user_ptr(kbuf->addr); | |
3075 | } | |
3076 | ||
3077 | #ifdef CONFIG_COMPAT | |
3078 | static ssize_t io_compat_import(struct io_kiocb *req, struct iovec *iov, | |
3079 | bool needs_lock) | |
3080 | { | |
3081 | struct compat_iovec __user *uiov; | |
3082 | compat_ssize_t clen; | |
3083 | void __user *buf; | |
3084 | ssize_t len; | |
3085 | ||
3086 | uiov = u64_to_user_ptr(req->rw.addr); | |
3087 | if (!access_ok(uiov, sizeof(*uiov))) | |
3088 | return -EFAULT; | |
3089 | if (__get_user(clen, &uiov->iov_len)) | |
3090 | return -EFAULT; | |
3091 | if (clen < 0) | |
3092 | return -EINVAL; | |
3093 | ||
3094 | len = clen; | |
3095 | buf = io_rw_buffer_select(req, &len, needs_lock); | |
3096 | if (IS_ERR(buf)) | |
3097 | return PTR_ERR(buf); | |
3098 | iov[0].iov_base = buf; | |
3099 | iov[0].iov_len = (compat_size_t) len; | |
3100 | return 0; | |
3101 | } | |
3102 | #endif | |
3103 | ||
3104 | static ssize_t __io_iov_buffer_select(struct io_kiocb *req, struct iovec *iov, | |
3105 | bool needs_lock) | |
3106 | { | |
3107 | struct iovec __user *uiov = u64_to_user_ptr(req->rw.addr); | |
3108 | void __user *buf; | |
3109 | ssize_t len; | |
3110 | ||
3111 | if (copy_from_user(iov, uiov, sizeof(*uiov))) | |
3112 | return -EFAULT; | |
3113 | ||
3114 | len = iov[0].iov_len; | |
3115 | if (len < 0) | |
3116 | return -EINVAL; | |
3117 | buf = io_rw_buffer_select(req, &len, needs_lock); | |
3118 | if (IS_ERR(buf)) | |
3119 | return PTR_ERR(buf); | |
3120 | iov[0].iov_base = buf; | |
3121 | iov[0].iov_len = len; | |
3122 | return 0; | |
3123 | } | |
3124 | ||
3125 | static ssize_t io_iov_buffer_select(struct io_kiocb *req, struct iovec *iov, | |
3126 | bool needs_lock) | |
3127 | { | |
dddb3e26 JA |
3128 | if (req->flags & REQ_F_BUFFER_SELECTED) { |
3129 | struct io_buffer *kbuf; | |
3130 | ||
3131 | kbuf = (struct io_buffer *) (unsigned long) req->rw.addr; | |
3132 | iov[0].iov_base = u64_to_user_ptr(kbuf->addr); | |
3133 | iov[0].iov_len = kbuf->len; | |
4d954c25 | 3134 | return 0; |
dddb3e26 | 3135 | } |
4d954c25 JA |
3136 | if (!req->rw.len) |
3137 | return 0; | |
3138 | else if (req->rw.len > 1) | |
3139 | return -EINVAL; | |
3140 | ||
3141 | #ifdef CONFIG_COMPAT | |
3142 | if (req->ctx->compat) | |
3143 | return io_compat_import(req, iov, needs_lock); | |
3144 | #endif | |
3145 | ||
3146 | return __io_iov_buffer_select(req, iov, needs_lock); | |
3147 | } | |
3148 | ||
8452fd0c JA |
3149 | static ssize_t __io_import_iovec(int rw, struct io_kiocb *req, |
3150 | struct iovec **iovec, struct iov_iter *iter, | |
3151 | bool needs_lock) | |
2b188cc1 | 3152 | { |
9adbd45d JA |
3153 | void __user *buf = u64_to_user_ptr(req->rw.addr); |
3154 | size_t sqe_len = req->rw.len; | |
4d954c25 | 3155 | ssize_t ret; |
edafccee JA |
3156 | u8 opcode; |
3157 | ||
d625c6ee | 3158 | opcode = req->opcode; |
7d009165 | 3159 | if (opcode == IORING_OP_READ_FIXED || opcode == IORING_OP_WRITE_FIXED) { |
edafccee | 3160 | *iovec = NULL; |
9adbd45d | 3161 | return io_import_fixed(req, rw, iter); |
edafccee | 3162 | } |
2b188cc1 | 3163 | |
bcda7baa | 3164 | /* buffer index only valid with fixed read/write, or buffer select */ |
4f4eeba8 | 3165 | if (req->buf_index && !(req->flags & REQ_F_BUFFER_SELECT)) |
9adbd45d JA |
3166 | return -EINVAL; |
3167 | ||
3a6820f2 | 3168 | if (opcode == IORING_OP_READ || opcode == IORING_OP_WRITE) { |
bcda7baa | 3169 | if (req->flags & REQ_F_BUFFER_SELECT) { |
4d954c25 | 3170 | buf = io_rw_buffer_select(req, &sqe_len, needs_lock); |
867a23ea | 3171 | if (IS_ERR(buf)) |
4d954c25 | 3172 | return PTR_ERR(buf); |
3f9d6441 | 3173 | req->rw.len = sqe_len; |
bcda7baa JA |
3174 | } |
3175 | ||
3a6820f2 JA |
3176 | ret = import_single_range(rw, buf, sqe_len, *iovec, iter); |
3177 | *iovec = NULL; | |
3a901598 | 3178 | return ret < 0 ? ret : sqe_len; |
3a6820f2 JA |
3179 | } |
3180 | ||
4d954c25 JA |
3181 | if (req->flags & REQ_F_BUFFER_SELECT) { |
3182 | ret = io_iov_buffer_select(req, *iovec, needs_lock); | |
3f9d6441 JA |
3183 | if (!ret) { |
3184 | ret = (*iovec)->iov_len; | |
3185 | iov_iter_init(iter, rw, *iovec, 1, ret); | |
3186 | } | |
4d954c25 JA |
3187 | *iovec = NULL; |
3188 | return ret; | |
3189 | } | |
3190 | ||
89cd35c5 CH |
3191 | return __import_iovec(rw, buf, sqe_len, UIO_FASTIOV, iovec, iter, |
3192 | req->ctx->compat); | |
2b188cc1 JA |
3193 | } |
3194 | ||
8452fd0c JA |
3195 | static ssize_t io_import_iovec(int rw, struct io_kiocb *req, |
3196 | struct iovec **iovec, struct iov_iter *iter, | |
3197 | bool needs_lock) | |
3198 | { | |
e8c2bc1f JA |
3199 | struct io_async_rw *iorw = req->async_data; |
3200 | ||
3201 | if (!iorw) | |
8452fd0c JA |
3202 | return __io_import_iovec(rw, req, iovec, iter, needs_lock); |
3203 | *iovec = NULL; | |
e8c2bc1f | 3204 | return iov_iter_count(&iorw->iter); |
8452fd0c JA |
3205 | } |
3206 | ||
0fef9483 JA |
3207 | static inline loff_t *io_kiocb_ppos(struct kiocb *kiocb) |
3208 | { | |
5b09e37e | 3209 | return (kiocb->ki_filp->f_mode & FMODE_STREAM) ? NULL : &kiocb->ki_pos; |
0fef9483 JA |
3210 | } |
3211 | ||
31b51510 | 3212 | /* |
32960613 JA |
3213 | * For files that don't have ->read_iter() and ->write_iter(), handle them |
3214 | * by looping over ->read() or ->write() manually. | |
31b51510 | 3215 | */ |
4017eb91 | 3216 | static ssize_t loop_rw_iter(int rw, struct io_kiocb *req, struct iov_iter *iter) |
32960613 | 3217 | { |
4017eb91 JA |
3218 | struct kiocb *kiocb = &req->rw.kiocb; |
3219 | struct file *file = req->file; | |
32960613 JA |
3220 | ssize_t ret = 0; |
3221 | ||
3222 | /* | |
3223 | * Don't support polled IO through this interface, and we can't | |
3224 | * support non-blocking either. For the latter, this just causes | |
3225 | * the kiocb to be handled from an async context. | |
3226 | */ | |
3227 | if (kiocb->ki_flags & IOCB_HIPRI) | |
3228 | return -EOPNOTSUPP; | |
3229 | if (kiocb->ki_flags & IOCB_NOWAIT) | |
3230 | return -EAGAIN; | |
3231 | ||
3232 | while (iov_iter_count(iter)) { | |
311ae9e1 | 3233 | struct iovec iovec; |
32960613 JA |
3234 | ssize_t nr; |
3235 | ||
311ae9e1 PB |
3236 | if (!iov_iter_is_bvec(iter)) { |
3237 | iovec = iov_iter_iovec(iter); | |
3238 | } else { | |
4017eb91 JA |
3239 | iovec.iov_base = u64_to_user_ptr(req->rw.addr); |
3240 | iovec.iov_len = req->rw.len; | |
311ae9e1 PB |
3241 | } |
3242 | ||
32960613 JA |
3243 | if (rw == READ) { |
3244 | nr = file->f_op->read(file, iovec.iov_base, | |
0fef9483 | 3245 | iovec.iov_len, io_kiocb_ppos(kiocb)); |
32960613 JA |
3246 | } else { |
3247 | nr = file->f_op->write(file, iovec.iov_base, | |
0fef9483 | 3248 | iovec.iov_len, io_kiocb_ppos(kiocb)); |
32960613 JA |
3249 | } |
3250 | ||
3251 | if (nr < 0) { | |
3252 | if (!ret) | |
3253 | ret = nr; | |
3254 | break; | |
3255 | } | |
3256 | ret += nr; | |
3257 | if (nr != iovec.iov_len) | |
3258 | break; | |
4017eb91 JA |
3259 | req->rw.len -= nr; |
3260 | req->rw.addr += nr; | |
32960613 JA |
3261 | iov_iter_advance(iter, nr); |
3262 | } | |
3263 | ||
3264 | return ret; | |
3265 | } | |
3266 | ||
ff6165b2 JA |
3267 | static void io_req_map_rw(struct io_kiocb *req, const struct iovec *iovec, |
3268 | const struct iovec *fast_iov, struct iov_iter *iter) | |
f67676d1 | 3269 | { |
e8c2bc1f | 3270 | struct io_async_rw *rw = req->async_data; |
b64e3444 | 3271 | |
ff6165b2 | 3272 | memcpy(&rw->iter, iter, sizeof(*iter)); |
afb87658 | 3273 | rw->free_iovec = iovec; |
227c0c96 | 3274 | rw->bytes_done = 0; |
ff6165b2 JA |
3275 | /* can only be fixed buffers, no need to do anything */ |
3276 | if (iter->type == ITER_BVEC) | |
3277 | return; | |
b64e3444 | 3278 | if (!iovec) { |
ff6165b2 JA |
3279 | unsigned iov_off = 0; |
3280 | ||
3281 | rw->iter.iov = rw->fast_iov; | |
3282 | if (iter->iov != fast_iov) { | |
3283 | iov_off = iter->iov - fast_iov; | |
3284 | rw->iter.iov += iov_off; | |
3285 | } | |
3286 | if (rw->fast_iov != fast_iov) | |
3287 | memcpy(rw->fast_iov + iov_off, fast_iov + iov_off, | |
45097dae | 3288 | sizeof(struct iovec) * iter->nr_segs); |
99bc4c38 PB |
3289 | } else { |
3290 | req->flags |= REQ_F_NEED_CLEANUP; | |
f67676d1 JA |
3291 | } |
3292 | } | |
3293 | ||
e8c2bc1f | 3294 | static inline int __io_alloc_async_data(struct io_kiocb *req) |
3d9932a8 | 3295 | { |
e8c2bc1f JA |
3296 | WARN_ON_ONCE(!io_op_defs[req->opcode].async_size); |
3297 | req->async_data = kmalloc(io_op_defs[req->opcode].async_size, GFP_KERNEL); | |
3298 | return req->async_data == NULL; | |
3d9932a8 XW |
3299 | } |
3300 | ||
e8c2bc1f | 3301 | static int io_alloc_async_data(struct io_kiocb *req) |
f67676d1 | 3302 | { |
e8c2bc1f | 3303 | if (!io_op_defs[req->opcode].needs_async_data) |
d3656344 | 3304 | return 0; |
3d9932a8 | 3305 | |
e8c2bc1f | 3306 | return __io_alloc_async_data(req); |
b7bb4f7d JA |
3307 | } |
3308 | ||
ff6165b2 JA |
3309 | static int io_setup_async_rw(struct io_kiocb *req, const struct iovec *iovec, |
3310 | const struct iovec *fast_iov, | |
227c0c96 | 3311 | struct iov_iter *iter, bool force) |
b7bb4f7d | 3312 | { |
e8c2bc1f | 3313 | if (!force && !io_op_defs[req->opcode].needs_async_data) |
74566df3 | 3314 | return 0; |
e8c2bc1f JA |
3315 | if (!req->async_data) { |
3316 | if (__io_alloc_async_data(req)) | |
5d204bcf | 3317 | return -ENOMEM; |
b7bb4f7d | 3318 | |
ff6165b2 | 3319 | io_req_map_rw(req, iovec, fast_iov, iter); |
5d204bcf | 3320 | } |
b7bb4f7d | 3321 | return 0; |
f67676d1 JA |
3322 | } |
3323 | ||
73debe68 | 3324 | static inline int io_rw_prep_async(struct io_kiocb *req, int rw) |
c3e330a4 | 3325 | { |
e8c2bc1f | 3326 | struct io_async_rw *iorw = req->async_data; |
f4bff104 | 3327 | struct iovec *iov = iorw->fast_iov; |
c3e330a4 PB |
3328 | ssize_t ret; |
3329 | ||
73debe68 | 3330 | ret = __io_import_iovec(rw, req, &iov, &iorw->iter, false); |
c3e330a4 PB |
3331 | if (unlikely(ret < 0)) |
3332 | return ret; | |
3333 | ||
ab0b196c PB |
3334 | iorw->bytes_done = 0; |
3335 | iorw->free_iovec = iov; | |
3336 | if (iov) | |
3337 | req->flags |= REQ_F_NEED_CLEANUP; | |
c3e330a4 PB |
3338 | return 0; |
3339 | } | |
3340 | ||
73debe68 | 3341 | static int io_read_prep(struct io_kiocb *req, const struct io_uring_sqe *sqe) |
f67676d1 JA |
3342 | { |
3343 | ssize_t ret; | |
3344 | ||
a88fc400 | 3345 | ret = io_prep_rw(req, sqe); |
3529d8c2 JA |
3346 | if (ret) |
3347 | return ret; | |
f67676d1 | 3348 | |
3529d8c2 JA |
3349 | if (unlikely(!(req->file->f_mode & FMODE_READ))) |
3350 | return -EBADF; | |
f67676d1 | 3351 | |
5f798bea | 3352 | /* either don't need iovec imported or already have it */ |
2d199895 | 3353 | if (!req->async_data) |
3529d8c2 | 3354 | return 0; |
73debe68 | 3355 | return io_rw_prep_async(req, READ); |
f67676d1 JA |
3356 | } |
3357 | ||
c1dd91d1 JA |
3358 | /* |
3359 | * This is our waitqueue callback handler, registered through lock_page_async() | |
3360 | * when we initially tried to do the IO with the iocb armed our waitqueue. | |
3361 | * This gets called when the page is unlocked, and we generally expect that to | |
3362 | * happen when the page IO is completed and the page is now uptodate. This will | |
3363 | * queue a task_work based retry of the operation, attempting to copy the data | |
3364 | * again. If the latter fails because the page was NOT uptodate, then we will | |
3365 | * do a thread based blocking retry of the operation. That's the unexpected | |
3366 | * slow path. | |
3367 | */ | |
bcf5a063 JA |
3368 | static int io_async_buf_func(struct wait_queue_entry *wait, unsigned mode, |
3369 | int sync, void *arg) | |
3370 | { | |
3371 | struct wait_page_queue *wpq; | |
3372 | struct io_kiocb *req = wait->private; | |
bcf5a063 | 3373 | struct wait_page_key *key = arg; |
bcf5a063 JA |
3374 | int ret; |
3375 | ||
3376 | wpq = container_of(wait, struct wait_page_queue, wait); | |
3377 | ||
cdc8fcb4 LT |
3378 | if (!wake_page_match(wpq, key)) |
3379 | return 0; | |
3380 | ||
c8d317aa | 3381 | req->rw.kiocb.ki_flags &= ~IOCB_WAITQ; |
bcf5a063 JA |
3382 | list_del_init(&wait->entry); |
3383 | ||
e7375122 | 3384 | init_task_work(&req->task_work, io_req_task_submit); |
6d816e08 JA |
3385 | percpu_ref_get(&req->ctx->refs); |
3386 | ||
bcf5a063 JA |
3387 | /* submit ref gets dropped, acquire a new one */ |
3388 | refcount_inc(&req->refs); | |
87c4311f | 3389 | ret = io_req_task_work_add(req, true); |
bcf5a063 | 3390 | if (unlikely(ret)) { |
c2c4c83c JA |
3391 | struct task_struct *tsk; |
3392 | ||
bcf5a063 | 3393 | /* queue just for cancelation */ |
e7375122 | 3394 | init_task_work(&req->task_work, io_req_task_cancel); |
bcf5a063 | 3395 | tsk = io_wq_get_task(req->ctx->io_wq); |
91989c70 | 3396 | task_work_add(tsk, &req->task_work, TWA_NONE); |
c2c4c83c | 3397 | wake_up_process(tsk); |
bcf5a063 | 3398 | } |
bcf5a063 JA |
3399 | return 1; |
3400 | } | |
3401 | ||
c1dd91d1 JA |
3402 | /* |
3403 | * This controls whether a given IO request should be armed for async page | |
3404 | * based retry. If we return false here, the request is handed to the async | |
3405 | * worker threads for retry. If we're doing buffered reads on a regular file, | |
3406 | * we prepare a private wait_page_queue entry and retry the operation. This | |
3407 | * will either succeed because the page is now uptodate and unlocked, or it | |
3408 | * will register a callback when the page is unlocked at IO completion. Through | |
3409 | * that callback, io_uring uses task_work to setup a retry of the operation. | |
3410 | * That retry will attempt the buffered read again. The retry will generally | |
3411 | * succeed, or in rare cases where it fails, we then fall back to using the | |
3412 | * async worker threads for a blocking retry. | |
3413 | */ | |
227c0c96 | 3414 | static bool io_rw_should_retry(struct io_kiocb *req) |
f67676d1 | 3415 | { |
e8c2bc1f JA |
3416 | struct io_async_rw *rw = req->async_data; |
3417 | struct wait_page_queue *wait = &rw->wpq; | |
bcf5a063 | 3418 | struct kiocb *kiocb = &req->rw.kiocb; |
f67676d1 | 3419 | |
bcf5a063 JA |
3420 | /* never retry for NOWAIT, we just complete with -EAGAIN */ |
3421 | if (req->flags & REQ_F_NOWAIT) | |
3422 | return false; | |
f67676d1 | 3423 | |
227c0c96 | 3424 | /* Only for buffered IO */ |
3b2a4439 | 3425 | if (kiocb->ki_flags & (IOCB_DIRECT | IOCB_HIPRI)) |
bcf5a063 | 3426 | return false; |
3b2a4439 | 3427 | |
bcf5a063 JA |
3428 | /* |
3429 | * just use poll if we can, and don't attempt if the fs doesn't | |
3430 | * support callback based unlocks | |
3431 | */ | |
3432 | if (file_can_poll(req->file) || !(req->file->f_mode & FMODE_BUF_RASYNC)) | |
3433 | return false; | |
f67676d1 | 3434 | |
3b2a4439 JA |
3435 | wait->wait.func = io_async_buf_func; |
3436 | wait->wait.private = req; | |
3437 | wait->wait.flags = 0; | |
3438 | INIT_LIST_HEAD(&wait->wait.entry); | |
3439 | kiocb->ki_flags |= IOCB_WAITQ; | |
c8d317aa | 3440 | kiocb->ki_flags &= ~IOCB_NOWAIT; |
3b2a4439 | 3441 | kiocb->ki_waitq = wait; |
3b2a4439 | 3442 | return true; |
bcf5a063 JA |
3443 | } |
3444 | ||
3445 | static int io_iter_do_read(struct io_kiocb *req, struct iov_iter *iter) | |
3446 | { | |
3447 | if (req->file->f_op->read_iter) | |
3448 | return call_read_iter(req->file, &req->rw.kiocb, iter); | |
2dd2111d | 3449 | else if (req->file->f_op->read) |
4017eb91 | 3450 | return loop_rw_iter(READ, req, iter); |
2dd2111d GH |
3451 | else |
3452 | return -EINVAL; | |
f67676d1 JA |
3453 | } |
3454 | ||
a1d7c393 JA |
3455 | static int io_read(struct io_kiocb *req, bool force_nonblock, |
3456 | struct io_comp_state *cs) | |
2b188cc1 JA |
3457 | { |
3458 | struct iovec inline_vecs[UIO_FASTIOV], *iovec = inline_vecs; | |
9adbd45d | 3459 | struct kiocb *kiocb = &req->rw.kiocb; |
ff6165b2 | 3460 | struct iov_iter __iter, *iter = &__iter; |
e8c2bc1f | 3461 | struct io_async_rw *rw = req->async_data; |
227c0c96 | 3462 | ssize_t io_size, ret, ret2; |
31b51510 | 3463 | size_t iov_count; |
f5cac8b1 | 3464 | bool no_async; |
ff6165b2 | 3465 | |
e8c2bc1f JA |
3466 | if (rw) |
3467 | iter = &rw->iter; | |
2b188cc1 | 3468 | |
ff6165b2 | 3469 | ret = io_import_iovec(READ, req, &iovec, iter, !force_nonblock); |
06b76d44 JA |
3470 | if (ret < 0) |
3471 | return ret; | |
eefdf30f | 3472 | iov_count = iov_iter_count(iter); |
fa15bafb PB |
3473 | io_size = ret; |
3474 | req->result = io_size; | |
227c0c96 | 3475 | ret = 0; |
2b188cc1 | 3476 | |
fd6c2e4c JA |
3477 | /* Ensure we clear previously set non-block flag */ |
3478 | if (!force_nonblock) | |
29de5f6a | 3479 | kiocb->ki_flags &= ~IOCB_NOWAIT; |
a88fc400 PB |
3480 | else |
3481 | kiocb->ki_flags |= IOCB_NOWAIT; | |
3482 | ||
fd6c2e4c | 3483 | |
24c74678 | 3484 | /* If the file doesn't support async, just async punt */ |
f5cac8b1 JA |
3485 | no_async = force_nonblock && !io_file_supports_async(req->file, READ); |
3486 | if (no_async) | |
f67676d1 | 3487 | goto copy_iov; |
9e645e11 | 3488 | |
0fef9483 | 3489 | ret = rw_verify_area(READ, req->file, io_kiocb_ppos(kiocb), iov_count); |
fa15bafb PB |
3490 | if (unlikely(ret)) |
3491 | goto out_free; | |
2b188cc1 | 3492 | |
227c0c96 | 3493 | ret = io_iter_do_read(req, iter); |
32960613 | 3494 | |
227c0c96 JA |
3495 | if (!ret) { |
3496 | goto done; | |
3497 | } else if (ret == -EIOCBQUEUED) { | |
3498 | ret = 0; | |
3499 | goto out_free; | |
3500 | } else if (ret == -EAGAIN) { | |
eefdf30f JA |
3501 | /* IOPOLL retry should happen for io-wq threads */ |
3502 | if (!force_nonblock && !(req->ctx->flags & IORING_SETUP_IOPOLL)) | |
f91daf56 | 3503 | goto done; |
355afaeb JA |
3504 | /* no retry on NONBLOCK marked file */ |
3505 | if (req->file->f_flags & O_NONBLOCK) | |
3506 | goto done; | |
84216315 JA |
3507 | /* some cases will consume bytes even on error returns */ |
3508 | iov_iter_revert(iter, iov_count - iov_iter_count(iter)); | |
f38c7e3a JA |
3509 | ret = 0; |
3510 | goto copy_iov; | |
227c0c96 | 3511 | } else if (ret < 0) { |
00d23d51 JA |
3512 | /* make sure -ERESTARTSYS -> -EINTR is done */ |
3513 | goto done; | |
227c0c96 JA |
3514 | } |
3515 | ||
3516 | /* read it all, or we did blocking attempt. no retry. */ | |
f91daf56 JA |
3517 | if (!iov_iter_count(iter) || !force_nonblock || |
3518 | (req->file->f_flags & O_NONBLOCK)) | |
227c0c96 JA |
3519 | goto done; |
3520 | ||
3521 | io_size -= ret; | |
3522 | copy_iov: | |
3523 | ret2 = io_setup_async_rw(req, iovec, inline_vecs, iter, true); | |
3524 | if (ret2) { | |
3525 | ret = ret2; | |
3526 | goto out_free; | |
3527 | } | |
f5cac8b1 JA |
3528 | if (no_async) |
3529 | return -EAGAIN; | |
e8c2bc1f | 3530 | rw = req->async_data; |
227c0c96 JA |
3531 | /* it's copied and will be cleaned with ->io */ |
3532 | iovec = NULL; | |
3533 | /* now use our persistent iterator, if we aren't already */ | |
e8c2bc1f | 3534 | iter = &rw->iter; |
227c0c96 | 3535 | retry: |
e8c2bc1f | 3536 | rw->bytes_done += ret; |
227c0c96 JA |
3537 | /* if we can retry, do so with the callbacks armed */ |
3538 | if (!io_rw_should_retry(req)) { | |
fa15bafb PB |
3539 | kiocb->ki_flags &= ~IOCB_WAITQ; |
3540 | return -EAGAIN; | |
2b188cc1 | 3541 | } |
227c0c96 JA |
3542 | |
3543 | /* | |
3544 | * Now retry read with the IOCB_WAITQ parts set in the iocb. If we | |
3545 | * get -EIOCBQUEUED, then we'll get a notification when the desired | |
3546 | * page gets unlocked. We can also get a partial read here, and if we | |
3547 | * do, then just retry at the new offset. | |
3548 | */ | |
3549 | ret = io_iter_do_read(req, iter); | |
3550 | if (ret == -EIOCBQUEUED) { | |
3551 | ret = 0; | |
3552 | goto out_free; | |
3553 | } else if (ret > 0 && ret < io_size) { | |
3554 | /* we got some bytes, but not all. retry. */ | |
3555 | goto retry; | |
3556 | } | |
3557 | done: | |
3558 | kiocb_done(kiocb, ret, cs); | |
3559 | ret = 0; | |
f67676d1 | 3560 | out_free: |
f261c168 | 3561 | /* it's reportedly faster than delegating the null check to kfree() */ |
252917c3 | 3562 | if (iovec) |
6f2cc166 | 3563 | kfree(iovec); |
2b188cc1 JA |
3564 | return ret; |
3565 | } | |
3566 | ||
73debe68 | 3567 | static int io_write_prep(struct io_kiocb *req, const struct io_uring_sqe *sqe) |
f67676d1 JA |
3568 | { |
3569 | ssize_t ret; | |
3570 | ||
a88fc400 | 3571 | ret = io_prep_rw(req, sqe); |
3529d8c2 JA |
3572 | if (ret) |
3573 | return ret; | |
f67676d1 | 3574 | |
3529d8c2 JA |
3575 | if (unlikely(!(req->file->f_mode & FMODE_WRITE))) |
3576 | return -EBADF; | |
f67676d1 | 3577 | |
5f798bea | 3578 | /* either don't need iovec imported or already have it */ |
2d199895 | 3579 | if (!req->async_data) |
3529d8c2 | 3580 | return 0; |
73debe68 | 3581 | return io_rw_prep_async(req, WRITE); |
f67676d1 JA |
3582 | } |
3583 | ||
a1d7c393 JA |
3584 | static int io_write(struct io_kiocb *req, bool force_nonblock, |
3585 | struct io_comp_state *cs) | |
2b188cc1 JA |
3586 | { |
3587 | struct iovec inline_vecs[UIO_FASTIOV], *iovec = inline_vecs; | |
9adbd45d | 3588 | struct kiocb *kiocb = &req->rw.kiocb; |
ff6165b2 | 3589 | struct iov_iter __iter, *iter = &__iter; |
e8c2bc1f | 3590 | struct io_async_rw *rw = req->async_data; |
31b51510 | 3591 | size_t iov_count; |
fa15bafb | 3592 | ssize_t ret, ret2, io_size; |
2b188cc1 | 3593 | |
e8c2bc1f JA |
3594 | if (rw) |
3595 | iter = &rw->iter; | |
ff6165b2 JA |
3596 | |
3597 | ret = io_import_iovec(WRITE, req, &iovec, iter, !force_nonblock); | |
06b76d44 JA |
3598 | if (ret < 0) |
3599 | return ret; | |
eefdf30f | 3600 | iov_count = iov_iter_count(iter); |
fa15bafb PB |
3601 | io_size = ret; |
3602 | req->result = io_size; | |
2b188cc1 | 3603 | |
fd6c2e4c JA |
3604 | /* Ensure we clear previously set non-block flag */ |
3605 | if (!force_nonblock) | |
a88fc400 PB |
3606 | kiocb->ki_flags &= ~IOCB_NOWAIT; |
3607 | else | |
3608 | kiocb->ki_flags |= IOCB_NOWAIT; | |
fd6c2e4c | 3609 | |
24c74678 | 3610 | /* If the file doesn't support async, just async punt */ |
af197f50 | 3611 | if (force_nonblock && !io_file_supports_async(req->file, WRITE)) |
f67676d1 | 3612 | goto copy_iov; |
31b51510 | 3613 | |
10d59345 JA |
3614 | /* file path doesn't support NOWAIT for non-direct_IO */ |
3615 | if (force_nonblock && !(kiocb->ki_flags & IOCB_DIRECT) && | |
3616 | (req->flags & REQ_F_ISREG)) | |
f67676d1 | 3617 | goto copy_iov; |
31b51510 | 3618 | |
0fef9483 | 3619 | ret = rw_verify_area(WRITE, req->file, io_kiocb_ppos(kiocb), iov_count); |
fa15bafb PB |
3620 | if (unlikely(ret)) |
3621 | goto out_free; | |
4ed734b0 | 3622 | |
fa15bafb PB |
3623 | /* |
3624 | * Open-code file_start_write here to grab freeze protection, | |
3625 | * which will be released by another thread in | |
3626 | * io_complete_rw(). Fool lockdep by telling it the lock got | |
3627 | * released so that it doesn't complain about the held lock when | |
3628 | * we return to userspace. | |
3629 | */ | |
3630 | if (req->flags & REQ_F_ISREG) { | |
8a3c84b6 | 3631 | sb_start_write(file_inode(req->file)->i_sb); |
fa15bafb PB |
3632 | __sb_writers_release(file_inode(req->file)->i_sb, |
3633 | SB_FREEZE_WRITE); | |
3634 | } | |
3635 | kiocb->ki_flags |= IOCB_WRITE; | |
4ed734b0 | 3636 | |
fa15bafb | 3637 | if (req->file->f_op->write_iter) |
ff6165b2 | 3638 | ret2 = call_write_iter(req->file, kiocb, iter); |
2dd2111d | 3639 | else if (req->file->f_op->write) |
4017eb91 | 3640 | ret2 = loop_rw_iter(WRITE, req, iter); |
2dd2111d GH |
3641 | else |
3642 | ret2 = -EINVAL; | |
4ed734b0 | 3643 | |
fa15bafb PB |
3644 | /* |
3645 | * Raw bdev writes will return -EOPNOTSUPP for IOCB_NOWAIT. Just | |
3646 | * retry them without IOCB_NOWAIT. | |
3647 | */ | |
3648 | if (ret2 == -EOPNOTSUPP && (kiocb->ki_flags & IOCB_NOWAIT)) | |
3649 | ret2 = -EAGAIN; | |
355afaeb JA |
3650 | /* no retry on NONBLOCK marked file */ |
3651 | if (ret2 == -EAGAIN && (req->file->f_flags & O_NONBLOCK)) | |
3652 | goto done; | |
fa15bafb | 3653 | if (!force_nonblock || ret2 != -EAGAIN) { |
eefdf30f JA |
3654 | /* IOPOLL retry should happen for io-wq threads */ |
3655 | if ((req->ctx->flags & IORING_SETUP_IOPOLL) && ret2 == -EAGAIN) | |
3656 | goto copy_iov; | |
355afaeb | 3657 | done: |
fa15bafb PB |
3658 | kiocb_done(kiocb, ret2, cs); |
3659 | } else { | |
f67676d1 | 3660 | copy_iov: |
84216315 JA |
3661 | /* some cases will consume bytes even on error returns */ |
3662 | iov_iter_revert(iter, iov_count - iov_iter_count(iter)); | |
227c0c96 | 3663 | ret = io_setup_async_rw(req, iovec, inline_vecs, iter, false); |
ff6165b2 JA |
3664 | if (!ret) |
3665 | return -EAGAIN; | |
2b188cc1 | 3666 | } |
31b51510 | 3667 | out_free: |
f261c168 | 3668 | /* it's reportedly faster than delegating the null check to kfree() */ |
252917c3 | 3669 | if (iovec) |
6f2cc166 | 3670 | kfree(iovec); |
2b188cc1 JA |
3671 | return ret; |
3672 | } | |
3673 | ||
80a261fd JA |
3674 | static int io_renameat_prep(struct io_kiocb *req, |
3675 | const struct io_uring_sqe *sqe) | |
3676 | { | |
3677 | struct io_rename *ren = &req->rename; | |
3678 | const char __user *oldf, *newf; | |
3679 | ||
3680 | if (unlikely(req->flags & REQ_F_FIXED_FILE)) | |
3681 | return -EBADF; | |
3682 | ||
3683 | ren->old_dfd = READ_ONCE(sqe->fd); | |
3684 | oldf = u64_to_user_ptr(READ_ONCE(sqe->addr)); | |
3685 | newf = u64_to_user_ptr(READ_ONCE(sqe->addr2)); | |
3686 | ren->new_dfd = READ_ONCE(sqe->len); | |
3687 | ren->flags = READ_ONCE(sqe->rename_flags); | |
3688 | ||
3689 | ren->oldpath = getname(oldf); | |
3690 | if (IS_ERR(ren->oldpath)) | |
3691 | return PTR_ERR(ren->oldpath); | |
3692 | ||
3693 | ren->newpath = getname(newf); | |
3694 | if (IS_ERR(ren->newpath)) { | |
3695 | putname(ren->oldpath); | |
3696 | return PTR_ERR(ren->newpath); | |
3697 | } | |
3698 | ||
3699 | req->flags |= REQ_F_NEED_CLEANUP; | |
3700 | return 0; | |
3701 | } | |
3702 | ||
3703 | static int io_renameat(struct io_kiocb *req, bool force_nonblock) | |
3704 | { | |
3705 | struct io_rename *ren = &req->rename; | |
3706 | int ret; | |
3707 | ||
3708 | if (force_nonblock) | |
3709 | return -EAGAIN; | |
3710 | ||
3711 | ret = do_renameat2(ren->old_dfd, ren->oldpath, ren->new_dfd, | |
3712 | ren->newpath, ren->flags); | |
3713 | ||
3714 | req->flags &= ~REQ_F_NEED_CLEANUP; | |
3715 | if (ret < 0) | |
3716 | req_set_fail_links(req); | |
3717 | io_req_complete(req, ret); | |
3718 | return 0; | |
3719 | } | |
3720 | ||
14a1143b JA |
3721 | static int io_unlinkat_prep(struct io_kiocb *req, |
3722 | const struct io_uring_sqe *sqe) | |
3723 | { | |
3724 | struct io_unlink *un = &req->unlink; | |
3725 | const char __user *fname; | |
3726 | ||
3727 | if (unlikely(req->flags & REQ_F_FIXED_FILE)) | |
3728 | return -EBADF; | |
3729 | ||
3730 | un->dfd = READ_ONCE(sqe->fd); | |
3731 | ||
3732 | un->flags = READ_ONCE(sqe->unlink_flags); | |
3733 | if (un->flags & ~AT_REMOVEDIR) | |
3734 | return -EINVAL; | |
3735 | ||
3736 | fname = u64_to_user_ptr(READ_ONCE(sqe->addr)); | |
3737 | un->filename = getname(fname); | |
3738 | if (IS_ERR(un->filename)) | |
3739 | return PTR_ERR(un->filename); | |
3740 | ||
3741 | req->flags |= REQ_F_NEED_CLEANUP; | |
3742 | return 0; | |
3743 | } | |
3744 | ||
3745 | static int io_unlinkat(struct io_kiocb *req, bool force_nonblock) | |
3746 | { | |
3747 | struct io_unlink *un = &req->unlink; | |
3748 | int ret; | |
3749 | ||
3750 | if (force_nonblock) | |
3751 | return -EAGAIN; | |
3752 | ||
3753 | if (un->flags & AT_REMOVEDIR) | |
3754 | ret = do_rmdir(un->dfd, un->filename); | |
3755 | else | |
3756 | ret = do_unlinkat(un->dfd, un->filename); | |
3757 | ||
3758 | req->flags &= ~REQ_F_NEED_CLEANUP; | |
3759 | if (ret < 0) | |
3760 | req_set_fail_links(req); | |
3761 | io_req_complete(req, ret); | |
3762 | return 0; | |
3763 | } | |
3764 | ||
36f4fa68 JA |
3765 | static int io_shutdown_prep(struct io_kiocb *req, |
3766 | const struct io_uring_sqe *sqe) | |
3767 | { | |
3768 | #if defined(CONFIG_NET) | |
3769 | if (unlikely(req->ctx->flags & IORING_SETUP_IOPOLL)) | |
3770 | return -EINVAL; | |
3771 | if (sqe->ioprio || sqe->off || sqe->addr || sqe->rw_flags || | |
3772 | sqe->buf_index) | |
3773 | return -EINVAL; | |
3774 | ||
3775 | req->shutdown.how = READ_ONCE(sqe->len); | |
3776 | return 0; | |
3777 | #else | |
3778 | return -EOPNOTSUPP; | |
3779 | #endif | |
3780 | } | |
3781 | ||
3782 | static int io_shutdown(struct io_kiocb *req, bool force_nonblock) | |
3783 | { | |
3784 | #if defined(CONFIG_NET) | |
3785 | struct socket *sock; | |
3786 | int ret; | |
3787 | ||
3788 | if (force_nonblock) | |
3789 | return -EAGAIN; | |
3790 | ||
3791 | sock = sock_from_file(req->file, &ret); | |
3792 | if (unlikely(!sock)) | |
3793 | return ret; | |
3794 | ||
3795 | ret = __sys_shutdown_sock(sock, req->shutdown.how); | |
3796 | io_req_complete(req, ret); | |
3797 | return 0; | |
3798 | #else | |
3799 | return -EOPNOTSUPP; | |
3800 | #endif | |
3801 | } | |
3802 | ||
f2a8d5c7 PB |
3803 | static int __io_splice_prep(struct io_kiocb *req, |
3804 | const struct io_uring_sqe *sqe) | |
7d67af2c PB |
3805 | { |
3806 | struct io_splice* sp = &req->splice; | |
3807 | unsigned int valid_flags = SPLICE_F_FD_IN_FIXED | SPLICE_F_ALL; | |
7d67af2c | 3808 | |
3232dd02 PB |
3809 | if (unlikely(req->ctx->flags & IORING_SETUP_IOPOLL)) |
3810 | return -EINVAL; | |
7d67af2c PB |
3811 | |
3812 | sp->file_in = NULL; | |
7d67af2c PB |
3813 | sp->len = READ_ONCE(sqe->len); |
3814 | sp->flags = READ_ONCE(sqe->splice_flags); | |
3815 | ||
3816 | if (unlikely(sp->flags & ~valid_flags)) | |
3817 | return -EINVAL; | |
3818 | ||
8371adf5 PB |
3819 | sp->file_in = io_file_get(NULL, req, READ_ONCE(sqe->splice_fd_in), |
3820 | (sp->flags & SPLICE_F_FD_IN_FIXED)); | |
3821 | if (!sp->file_in) | |
3822 | return -EBADF; | |
7d67af2c PB |
3823 | req->flags |= REQ_F_NEED_CLEANUP; |
3824 | ||
7cdaf587 XW |
3825 | if (!S_ISREG(file_inode(sp->file_in)->i_mode)) { |
3826 | /* | |
3827 | * Splice operation will be punted aync, and here need to | |
3828 | * modify io_wq_work.flags, so initialize io_wq_work firstly. | |
3829 | */ | |
3830 | io_req_init_async(req); | |
7d67af2c | 3831 | req->work.flags |= IO_WQ_WORK_UNBOUND; |
7cdaf587 | 3832 | } |
7d67af2c PB |
3833 | |
3834 | return 0; | |
3835 | } | |
3836 | ||
f2a8d5c7 PB |
3837 | static int io_tee_prep(struct io_kiocb *req, |
3838 | const struct io_uring_sqe *sqe) | |
3839 | { | |
3840 | if (READ_ONCE(sqe->splice_off_in) || READ_ONCE(sqe->off)) | |
3841 | return -EINVAL; | |
3842 | return __io_splice_prep(req, sqe); | |
3843 | } | |
3844 | ||
3845 | static int io_tee(struct io_kiocb *req, bool force_nonblock) | |
3846 | { | |
3847 | struct io_splice *sp = &req->splice; | |
3848 | struct file *in = sp->file_in; | |
3849 | struct file *out = sp->file_out; | |
3850 | unsigned int flags = sp->flags & ~SPLICE_F_FD_IN_FIXED; | |
3851 | long ret = 0; | |
3852 | ||
3853 | if (force_nonblock) | |
3854 | return -EAGAIN; | |
3855 | if (sp->len) | |
3856 | ret = do_tee(in, out, sp->len, flags); | |
3857 | ||
3858 | io_put_file(req, in, (sp->flags & SPLICE_F_FD_IN_FIXED)); | |
3859 | req->flags &= ~REQ_F_NEED_CLEANUP; | |
3860 | ||
f2a8d5c7 PB |
3861 | if (ret != sp->len) |
3862 | req_set_fail_links(req); | |
e1e16097 | 3863 | io_req_complete(req, ret); |
f2a8d5c7 PB |
3864 | return 0; |
3865 | } | |
3866 | ||
3867 | static int io_splice_prep(struct io_kiocb *req, const struct io_uring_sqe *sqe) | |
3868 | { | |
3869 | struct io_splice* sp = &req->splice; | |
3870 | ||
3871 | sp->off_in = READ_ONCE(sqe->splice_off_in); | |
3872 | sp->off_out = READ_ONCE(sqe->off); | |
3873 | return __io_splice_prep(req, sqe); | |
3874 | } | |
3875 | ||
014db007 | 3876 | static int io_splice(struct io_kiocb *req, bool force_nonblock) |
7d67af2c PB |
3877 | { |
3878 | struct io_splice *sp = &req->splice; | |
3879 | struct file *in = sp->file_in; | |
3880 | struct file *out = sp->file_out; | |
3881 | unsigned int flags = sp->flags & ~SPLICE_F_FD_IN_FIXED; | |
3882 | loff_t *poff_in, *poff_out; | |
c9687426 | 3883 | long ret = 0; |
7d67af2c | 3884 | |
2fb3e822 PB |
3885 | if (force_nonblock) |
3886 | return -EAGAIN; | |
7d67af2c PB |
3887 | |
3888 | poff_in = (sp->off_in == -1) ? NULL : &sp->off_in; | |
3889 | poff_out = (sp->off_out == -1) ? NULL : &sp->off_out; | |
c9687426 | 3890 | |
948a7749 | 3891 | if (sp->len) |
c9687426 | 3892 | ret = do_splice(in, poff_in, out, poff_out, sp->len, flags); |
7d67af2c PB |
3893 | |
3894 | io_put_file(req, in, (sp->flags & SPLICE_F_FD_IN_FIXED)); | |
3895 | req->flags &= ~REQ_F_NEED_CLEANUP; | |
3896 | ||
7d67af2c PB |
3897 | if (ret != sp->len) |
3898 | req_set_fail_links(req); | |
e1e16097 | 3899 | io_req_complete(req, ret); |
7d67af2c PB |
3900 | return 0; |
3901 | } | |
3902 | ||
2b188cc1 JA |
3903 | /* |
3904 | * IORING_OP_NOP just posts a completion event, nothing else. | |
3905 | */ | |
229a7b63 | 3906 | static int io_nop(struct io_kiocb *req, struct io_comp_state *cs) |
2b188cc1 JA |
3907 | { |
3908 | struct io_ring_ctx *ctx = req->ctx; | |
2b188cc1 | 3909 | |
def596e9 JA |
3910 | if (unlikely(ctx->flags & IORING_SETUP_IOPOLL)) |
3911 | return -EINVAL; | |
3912 | ||
229a7b63 | 3913 | __io_req_complete(req, 0, 0, cs); |
2b188cc1 JA |
3914 | return 0; |
3915 | } | |
3916 | ||
3529d8c2 | 3917 | static int io_prep_fsync(struct io_kiocb *req, const struct io_uring_sqe *sqe) |
c992fe29 | 3918 | { |
6b06314c | 3919 | struct io_ring_ctx *ctx = req->ctx; |
c992fe29 | 3920 | |
09bb8394 JA |
3921 | if (!req->file) |
3922 | return -EBADF; | |
c992fe29 | 3923 | |
6b06314c | 3924 | if (unlikely(ctx->flags & IORING_SETUP_IOPOLL)) |
def596e9 | 3925 | return -EINVAL; |
edafccee | 3926 | if (unlikely(sqe->addr || sqe->ioprio || sqe->buf_index)) |
c992fe29 CH |
3927 | return -EINVAL; |
3928 | ||
8ed8d3c3 JA |
3929 | req->sync.flags = READ_ONCE(sqe->fsync_flags); |
3930 | if (unlikely(req->sync.flags & ~IORING_FSYNC_DATASYNC)) | |
3931 | return -EINVAL; | |
3932 | ||
3933 | req->sync.off = READ_ONCE(sqe->off); | |
3934 | req->sync.len = READ_ONCE(sqe->len); | |
c992fe29 CH |
3935 | return 0; |
3936 | } | |
3937 | ||
ac45abc0 | 3938 | static int io_fsync(struct io_kiocb *req, bool force_nonblock) |
8ed8d3c3 | 3939 | { |
8ed8d3c3 | 3940 | loff_t end = req->sync.off + req->sync.len; |
8ed8d3c3 JA |
3941 | int ret; |
3942 | ||
ac45abc0 PB |
3943 | /* fsync always requires a blocking context */ |
3944 | if (force_nonblock) | |
3945 | return -EAGAIN; | |
3946 | ||
9adbd45d | 3947 | ret = vfs_fsync_range(req->file, req->sync.off, |
8ed8d3c3 JA |
3948 | end > 0 ? end : LLONG_MAX, |
3949 | req->sync.flags & IORING_FSYNC_DATASYNC); | |
3950 | if (ret < 0) | |
3951 | req_set_fail_links(req); | |
e1e16097 | 3952 | io_req_complete(req, ret); |
c992fe29 CH |
3953 | return 0; |
3954 | } | |
3955 | ||
d63d1b5e JA |
3956 | static int io_fallocate_prep(struct io_kiocb *req, |
3957 | const struct io_uring_sqe *sqe) | |
3958 | { | |
3959 | if (sqe->ioprio || sqe->buf_index || sqe->rw_flags) | |
3960 | return -EINVAL; | |
3232dd02 PB |
3961 | if (unlikely(req->ctx->flags & IORING_SETUP_IOPOLL)) |
3962 | return -EINVAL; | |
d63d1b5e JA |
3963 | |
3964 | req->sync.off = READ_ONCE(sqe->off); | |
3965 | req->sync.len = READ_ONCE(sqe->addr); | |
3966 | req->sync.mode = READ_ONCE(sqe->len); | |
3967 | return 0; | |
3968 | } | |
3969 | ||
014db007 | 3970 | static int io_fallocate(struct io_kiocb *req, bool force_nonblock) |
5d17b4a4 | 3971 | { |
ac45abc0 PB |
3972 | int ret; |
3973 | ||
d63d1b5e | 3974 | /* fallocate always requiring blocking context */ |
ac45abc0 | 3975 | if (force_nonblock) |
5d17b4a4 | 3976 | return -EAGAIN; |
ac45abc0 PB |
3977 | ret = vfs_fallocate(req->file, req->sync.mode, req->sync.off, |
3978 | req->sync.len); | |
ac45abc0 PB |
3979 | if (ret < 0) |
3980 | req_set_fail_links(req); | |
e1e16097 | 3981 | io_req_complete(req, ret); |
5d17b4a4 JA |
3982 | return 0; |
3983 | } | |
3984 | ||
ec65fea5 | 3985 | static int __io_openat_prep(struct io_kiocb *req, const struct io_uring_sqe *sqe) |
b7bb4f7d | 3986 | { |
f8748881 | 3987 | const char __user *fname; |
15b71abe | 3988 | int ret; |
b7bb4f7d | 3989 | |
ec65fea5 | 3990 | if (unlikely(sqe->ioprio || sqe->buf_index)) |
15b71abe | 3991 | return -EINVAL; |
ec65fea5 | 3992 | if (unlikely(req->flags & REQ_F_FIXED_FILE)) |
cf3040ca | 3993 | return -EBADF; |
03b1230c | 3994 | |
ec65fea5 PB |
3995 | /* open.how should be already initialised */ |
3996 | if (!(req->open.how.flags & O_PATH) && force_o_largefile()) | |
08a1d26e | 3997 | req->open.how.flags |= O_LARGEFILE; |
3529d8c2 | 3998 | |
25e72d10 PB |
3999 | req->open.dfd = READ_ONCE(sqe->fd); |
4000 | fname = u64_to_user_ptr(READ_ONCE(sqe->addr)); | |
f8748881 | 4001 | req->open.filename = getname(fname); |
15b71abe JA |
4002 | if (IS_ERR(req->open.filename)) { |
4003 | ret = PTR_ERR(req->open.filename); | |
4004 | req->open.filename = NULL; | |
4005 | return ret; | |
4006 | } | |
4022e7af | 4007 | req->open.nofile = rlimit(RLIMIT_NOFILE); |
944d1444 | 4008 | req->open.ignore_nonblock = false; |
8fef80bf | 4009 | req->flags |= REQ_F_NEED_CLEANUP; |
15b71abe | 4010 | return 0; |
03b1230c JA |
4011 | } |
4012 | ||
ec65fea5 PB |
4013 | static int io_openat_prep(struct io_kiocb *req, const struct io_uring_sqe *sqe) |
4014 | { | |
4015 | u64 flags, mode; | |
4016 | ||
14587a46 | 4017 | if (unlikely(req->ctx->flags & IORING_SETUP_IOPOLL)) |
4eb8dded | 4018 | return -EINVAL; |
ec65fea5 PB |
4019 | mode = READ_ONCE(sqe->len); |
4020 | flags = READ_ONCE(sqe->open_flags); | |
4021 | req->open.how = build_open_how(flags, mode); | |
4022 | return __io_openat_prep(req, sqe); | |
4023 | } | |
4024 | ||
cebdb986 | 4025 | static int io_openat2_prep(struct io_kiocb *req, const struct io_uring_sqe *sqe) |
aa1fa28f | 4026 | { |
cebdb986 | 4027 | struct open_how __user *how; |
cebdb986 | 4028 | size_t len; |
0fa03c62 JA |
4029 | int ret; |
4030 | ||
14587a46 | 4031 | if (unlikely(req->ctx->flags & IORING_SETUP_IOPOLL)) |
4eb8dded | 4032 | return -EINVAL; |
cebdb986 JA |
4033 | how = u64_to_user_ptr(READ_ONCE(sqe->addr2)); |
4034 | len = READ_ONCE(sqe->len); | |
cebdb986 JA |
4035 | if (len < OPEN_HOW_SIZE_VER0) |
4036 | return -EINVAL; | |
3529d8c2 | 4037 | |
cebdb986 JA |
4038 | ret = copy_struct_from_user(&req->open.how, sizeof(req->open.how), how, |
4039 | len); | |
4040 | if (ret) | |
4041 | return ret; | |
3529d8c2 | 4042 | |
ec65fea5 | 4043 | return __io_openat_prep(req, sqe); |
cebdb986 JA |
4044 | } |
4045 | ||
014db007 | 4046 | static int io_openat2(struct io_kiocb *req, bool force_nonblock) |
15b71abe JA |
4047 | { |
4048 | struct open_flags op; | |
15b71abe JA |
4049 | struct file *file; |
4050 | int ret; | |
4051 | ||
944d1444 | 4052 | if (force_nonblock && !req->open.ignore_nonblock) |
15b71abe | 4053 | return -EAGAIN; |
15b71abe | 4054 | |
cebdb986 | 4055 | ret = build_open_flags(&req->open.how, &op); |
15b71abe JA |
4056 | if (ret) |
4057 | goto err; | |
4058 | ||
4022e7af | 4059 | ret = __get_unused_fd_flags(req->open.how.flags, req->open.nofile); |
15b71abe JA |
4060 | if (ret < 0) |
4061 | goto err; | |
4062 | ||
4063 | file = do_filp_open(req->open.dfd, req->open.filename, &op); | |
4064 | if (IS_ERR(file)) { | |
4065 | put_unused_fd(ret); | |
4066 | ret = PTR_ERR(file); | |
944d1444 JA |
4067 | /* |
4068 | * A work-around to ensure that /proc/self works that way | |
4069 | * that it should - if we get -EOPNOTSUPP back, then assume | |
4070 | * that proc_self_get_link() failed us because we're in async | |
4071 | * context. We should be safe to retry this from the task | |
4072 | * itself with force_nonblock == false set, as it should not | |
4073 | * block on lookup. Would be nice to know this upfront and | |
4074 | * avoid the async dance, but doesn't seem feasible. | |
4075 | */ | |
4076 | if (ret == -EOPNOTSUPP && io_wq_current_is_worker()) { | |
4077 | req->open.ignore_nonblock = true; | |
4078 | refcount_inc(&req->refs); | |
4079 | io_req_task_queue(req); | |
4080 | return 0; | |
4081 | } | |
15b71abe JA |
4082 | } else { |
4083 | fsnotify_open(file); | |
4084 | fd_install(ret, file); | |
4085 | } | |
4086 | err: | |
4087 | putname(req->open.filename); | |
8fef80bf | 4088 | req->flags &= ~REQ_F_NEED_CLEANUP; |
15b71abe JA |
4089 | if (ret < 0) |
4090 | req_set_fail_links(req); | |
e1e16097 | 4091 | io_req_complete(req, ret); |
15b71abe JA |
4092 | return 0; |
4093 | } | |
4094 | ||
014db007 | 4095 | static int io_openat(struct io_kiocb *req, bool force_nonblock) |
cebdb986 | 4096 | { |
014db007 | 4097 | return io_openat2(req, force_nonblock); |
cebdb986 JA |
4098 | } |
4099 | ||
067524e9 JA |
4100 | static int io_remove_buffers_prep(struct io_kiocb *req, |
4101 | const struct io_uring_sqe *sqe) | |
4102 | { | |
4103 | struct io_provide_buf *p = &req->pbuf; | |
4104 | u64 tmp; | |
4105 | ||
4106 | if (sqe->ioprio || sqe->rw_flags || sqe->addr || sqe->len || sqe->off) | |
4107 | return -EINVAL; | |
4108 | ||
4109 | tmp = READ_ONCE(sqe->fd); | |
4110 | if (!tmp || tmp > USHRT_MAX) | |
4111 | return -EINVAL; | |
4112 | ||
4113 | memset(p, 0, sizeof(*p)); | |
4114 | p->nbufs = tmp; | |
4115 | p->bgid = READ_ONCE(sqe->buf_group); | |
4116 | return 0; | |
4117 | } | |
4118 | ||
4119 | static int __io_remove_buffers(struct io_ring_ctx *ctx, struct io_buffer *buf, | |
4120 | int bgid, unsigned nbufs) | |
4121 | { | |
4122 | unsigned i = 0; | |
4123 | ||
4124 | /* shouldn't happen */ | |
4125 | if (!nbufs) | |
4126 | return 0; | |
4127 | ||
4128 | /* the head kbuf is the list itself */ | |
4129 | while (!list_empty(&buf->list)) { | |
4130 | struct io_buffer *nxt; | |
4131 | ||
4132 | nxt = list_first_entry(&buf->list, struct io_buffer, list); | |
4133 | list_del(&nxt->list); | |
4134 | kfree(nxt); | |
4135 | if (++i == nbufs) | |
4136 | return i; | |
4137 | } | |
4138 | i++; | |
4139 | kfree(buf); | |
4140 | idr_remove(&ctx->io_buffer_idr, bgid); | |
4141 | ||
4142 | return i; | |
4143 | } | |
4144 | ||
229a7b63 JA |
4145 | static int io_remove_buffers(struct io_kiocb *req, bool force_nonblock, |
4146 | struct io_comp_state *cs) | |
067524e9 JA |
4147 | { |
4148 | struct io_provide_buf *p = &req->pbuf; | |
4149 | struct io_ring_ctx *ctx = req->ctx; | |
4150 | struct io_buffer *head; | |
4151 | int ret = 0; | |
4152 | ||
4153 | io_ring_submit_lock(ctx, !force_nonblock); | |
4154 | ||
4155 | lockdep_assert_held(&ctx->uring_lock); | |
4156 | ||
4157 | ret = -ENOENT; | |
4158 | head = idr_find(&ctx->io_buffer_idr, p->bgid); | |
4159 | if (head) | |
4160 | ret = __io_remove_buffers(ctx, head, p->bgid, p->nbufs); | |
4161 | ||
4162 | io_ring_submit_lock(ctx, !force_nonblock); | |
4163 | if (ret < 0) | |
4164 | req_set_fail_links(req); | |
229a7b63 | 4165 | __io_req_complete(req, ret, 0, cs); |
067524e9 JA |
4166 | return 0; |
4167 | } | |
4168 | ||
ddf0322d JA |
4169 | static int io_provide_buffers_prep(struct io_kiocb *req, |
4170 | const struct io_uring_sqe *sqe) | |
4171 | { | |
4172 | struct io_provide_buf *p = &req->pbuf; | |
4173 | u64 tmp; | |
4174 | ||
4175 | if (sqe->ioprio || sqe->rw_flags) | |
4176 | return -EINVAL; | |
4177 | ||
4178 | tmp = READ_ONCE(sqe->fd); | |
4179 | if (!tmp || tmp > USHRT_MAX) | |
4180 | return -E2BIG; | |
4181 | p->nbufs = tmp; | |
4182 | p->addr = READ_ONCE(sqe->addr); | |
4183 | p->len = READ_ONCE(sqe->len); | |
4184 | ||
efe68c1c | 4185 | if (!access_ok(u64_to_user_ptr(p->addr), (p->len * p->nbufs))) |
ddf0322d JA |
4186 | return -EFAULT; |
4187 | ||
4188 | p->bgid = READ_ONCE(sqe->buf_group); | |
4189 | tmp = READ_ONCE(sqe->off); | |
4190 | if (tmp > USHRT_MAX) | |
4191 | return -E2BIG; | |
4192 | p->bid = tmp; | |
4193 | return 0; | |
4194 | } | |
4195 | ||
4196 | static int io_add_buffers(struct io_provide_buf *pbuf, struct io_buffer **head) | |
4197 | { | |
4198 | struct io_buffer *buf; | |
4199 | u64 addr = pbuf->addr; | |
4200 | int i, bid = pbuf->bid; | |
4201 | ||
4202 | for (i = 0; i < pbuf->nbufs; i++) { | |
4203 | buf = kmalloc(sizeof(*buf), GFP_KERNEL); | |
4204 | if (!buf) | |
4205 | break; | |
4206 | ||
4207 | buf->addr = addr; | |
4208 | buf->len = pbuf->len; | |
4209 | buf->bid = bid; | |
4210 | addr += pbuf->len; | |
4211 | bid++; | |
4212 | if (!*head) { | |
4213 | INIT_LIST_HEAD(&buf->list); | |
4214 | *head = buf; | |
4215 | } else { | |
4216 | list_add_tail(&buf->list, &(*head)->list); | |
4217 | } | |
4218 | } | |
4219 | ||
4220 | return i ? i : -ENOMEM; | |
4221 | } | |
4222 | ||
229a7b63 JA |
4223 | static int io_provide_buffers(struct io_kiocb *req, bool force_nonblock, |
4224 | struct io_comp_state *cs) | |
ddf0322d JA |
4225 | { |
4226 | struct io_provide_buf *p = &req->pbuf; | |
4227 | struct io_ring_ctx *ctx = req->ctx; | |
4228 | struct io_buffer *head, *list; | |
4229 | int ret = 0; | |
4230 | ||
4231 | io_ring_submit_lock(ctx, !force_nonblock); | |
4232 | ||
4233 | lockdep_assert_held(&ctx->uring_lock); | |
4234 | ||
4235 | list = head = idr_find(&ctx->io_buffer_idr, p->bgid); | |
4236 | ||
4237 | ret = io_add_buffers(p, &head); | |
4238 | if (ret < 0) | |
4239 | goto out; | |
4240 | ||
4241 | if (!list) { | |
4242 | ret = idr_alloc(&ctx->io_buffer_idr, head, p->bgid, p->bgid + 1, | |
4243 | GFP_KERNEL); | |
4244 | if (ret < 0) { | |
067524e9 | 4245 | __io_remove_buffers(ctx, head, p->bgid, -1U); |
ddf0322d JA |
4246 | goto out; |
4247 | } | |
4248 | } | |
4249 | out: | |
4250 | io_ring_submit_unlock(ctx, !force_nonblock); | |
4251 | if (ret < 0) | |
4252 | req_set_fail_links(req); | |
229a7b63 | 4253 | __io_req_complete(req, ret, 0, cs); |
ddf0322d | 4254 | return 0; |
cebdb986 JA |
4255 | } |
4256 | ||
3e4827b0 JA |
4257 | static int io_epoll_ctl_prep(struct io_kiocb *req, |
4258 | const struct io_uring_sqe *sqe) | |
4259 | { | |
4260 | #if defined(CONFIG_EPOLL) | |
4261 | if (sqe->ioprio || sqe->buf_index) | |
4262 | return -EINVAL; | |
6ca56f84 | 4263 | if (unlikely(req->ctx->flags & (IORING_SETUP_IOPOLL | IORING_SETUP_SQPOLL))) |
3232dd02 | 4264 | return -EINVAL; |
3e4827b0 JA |
4265 | |
4266 | req->epoll.epfd = READ_ONCE(sqe->fd); | |
4267 | req->epoll.op = READ_ONCE(sqe->len); | |
4268 | req->epoll.fd = READ_ONCE(sqe->off); | |
4269 | ||
4270 | if (ep_op_has_event(req->epoll.op)) { | |
4271 | struct epoll_event __user *ev; | |
4272 | ||
4273 | ev = u64_to_user_ptr(READ_ONCE(sqe->addr)); | |
4274 | if (copy_from_user(&req->epoll.event, ev, sizeof(*ev))) | |
4275 | return -EFAULT; | |
4276 | } | |
4277 | ||
4278 | return 0; | |
4279 | #else | |
4280 | return -EOPNOTSUPP; | |
4281 | #endif | |
4282 | } | |
4283 | ||
229a7b63 JA |
4284 | static int io_epoll_ctl(struct io_kiocb *req, bool force_nonblock, |
4285 | struct io_comp_state *cs) | |
3e4827b0 JA |
4286 | { |
4287 | #if defined(CONFIG_EPOLL) | |
4288 | struct io_epoll *ie = &req->epoll; | |
4289 | int ret; | |
4290 | ||
4291 | ret = do_epoll_ctl(ie->epfd, ie->op, ie->fd, &ie->event, force_nonblock); | |
4292 | if (force_nonblock && ret == -EAGAIN) | |
4293 | return -EAGAIN; | |
4294 | ||
4295 | if (ret < 0) | |
4296 | req_set_fail_links(req); | |
229a7b63 | 4297 | __io_req_complete(req, ret, 0, cs); |
3e4827b0 JA |
4298 | return 0; |
4299 | #else | |
4300 | return -EOPNOTSUPP; | |
4301 | #endif | |
4302 | } | |
4303 | ||
c1ca757b JA |
4304 | static int io_madvise_prep(struct io_kiocb *req, const struct io_uring_sqe *sqe) |
4305 | { | |
4306 | #if defined(CONFIG_ADVISE_SYSCALLS) && defined(CONFIG_MMU) | |
4307 | if (sqe->ioprio || sqe->buf_index || sqe->off) | |
4308 | return -EINVAL; | |
3232dd02 PB |
4309 | if (unlikely(req->ctx->flags & IORING_SETUP_IOPOLL)) |
4310 | return -EINVAL; | |
c1ca757b JA |
4311 | |
4312 | req->madvise.addr = READ_ONCE(sqe->addr); | |
4313 | req->madvise.len = READ_ONCE(sqe->len); | |
4314 | req->madvise.advice = READ_ONCE(sqe->fadvise_advice); | |
4315 | return 0; | |
4316 | #else | |
4317 | return -EOPNOTSUPP; | |
4318 | #endif | |
4319 | } | |
4320 | ||
014db007 | 4321 | static int io_madvise(struct io_kiocb *req, bool force_nonblock) |
c1ca757b JA |
4322 | { |
4323 | #if defined(CONFIG_ADVISE_SYSCALLS) && defined(CONFIG_MMU) | |
4324 | struct io_madvise *ma = &req->madvise; | |
4325 | int ret; | |
4326 | ||
4327 | if (force_nonblock) | |
4328 | return -EAGAIN; | |
4329 | ||
0726b01e | 4330 | ret = do_madvise(current->mm, ma->addr, ma->len, ma->advice); |
c1ca757b JA |
4331 | if (ret < 0) |
4332 | req_set_fail_links(req); | |
e1e16097 | 4333 | io_req_complete(req, ret); |
c1ca757b JA |
4334 | return 0; |
4335 | #else | |
4336 | return -EOPNOTSUPP; | |
4337 | #endif | |
4338 | } | |
4339 | ||
4840e418 JA |
4340 | static int io_fadvise_prep(struct io_kiocb *req, const struct io_uring_sqe *sqe) |
4341 | { | |
4342 | if (sqe->ioprio || sqe->buf_index || sqe->addr) | |
4343 | return -EINVAL; | |
3232dd02 PB |
4344 | if (unlikely(req->ctx->flags & IORING_SETUP_IOPOLL)) |
4345 | return -EINVAL; | |
4840e418 JA |
4346 | |
4347 | req->fadvise.offset = READ_ONCE(sqe->off); | |
4348 | req->fadvise.len = READ_ONCE(sqe->len); | |
4349 | req->fadvise.advice = READ_ONCE(sqe->fadvise_advice); | |
4350 | return 0; | |
4351 | } | |
4352 | ||
014db007 | 4353 | static int io_fadvise(struct io_kiocb *req, bool force_nonblock) |
4840e418 JA |
4354 | { |
4355 | struct io_fadvise *fa = &req->fadvise; | |
4356 | int ret; | |
4357 | ||
3e69426d JA |
4358 | if (force_nonblock) { |
4359 | switch (fa->advice) { | |
4360 | case POSIX_FADV_NORMAL: | |
4361 | case POSIX_FADV_RANDOM: | |
4362 | case POSIX_FADV_SEQUENTIAL: | |
4363 | break; | |
4364 | default: | |
4365 | return -EAGAIN; | |
4366 | } | |
4367 | } | |
4840e418 JA |
4368 | |
4369 | ret = vfs_fadvise(req->file, fa->offset, fa->len, fa->advice); | |
4370 | if (ret < 0) | |
4371 | req_set_fail_links(req); | |
e1e16097 | 4372 | io_req_complete(req, ret); |
4840e418 JA |
4373 | return 0; |
4374 | } | |
4375 | ||
eddc7ef5 JA |
4376 | static int io_statx_prep(struct io_kiocb *req, const struct io_uring_sqe *sqe) |
4377 | { | |
6ca56f84 | 4378 | if (unlikely(req->ctx->flags & (IORING_SETUP_IOPOLL | IORING_SETUP_SQPOLL))) |
3232dd02 | 4379 | return -EINVAL; |
eddc7ef5 JA |
4380 | if (sqe->ioprio || sqe->buf_index) |
4381 | return -EINVAL; | |
9c280f90 | 4382 | if (req->flags & REQ_F_FIXED_FILE) |
cf3040ca | 4383 | return -EBADF; |
eddc7ef5 | 4384 | |
1d9e1288 BM |
4385 | req->statx.dfd = READ_ONCE(sqe->fd); |
4386 | req->statx.mask = READ_ONCE(sqe->len); | |
e62753e4 | 4387 | req->statx.filename = u64_to_user_ptr(READ_ONCE(sqe->addr)); |
1d9e1288 BM |
4388 | req->statx.buffer = u64_to_user_ptr(READ_ONCE(sqe->addr2)); |
4389 | req->statx.flags = READ_ONCE(sqe->statx_flags); | |
eddc7ef5 JA |
4390 | |
4391 | return 0; | |
4392 | } | |
4393 | ||
014db007 | 4394 | static int io_statx(struct io_kiocb *req, bool force_nonblock) |
eddc7ef5 | 4395 | { |
1d9e1288 | 4396 | struct io_statx *ctx = &req->statx; |
eddc7ef5 JA |
4397 | int ret; |
4398 | ||
5b0bbee4 JA |
4399 | if (force_nonblock) { |
4400 | /* only need file table for an actual valid fd */ | |
4401 | if (ctx->dfd == -1 || ctx->dfd == AT_FDCWD) | |
4402 | req->flags |= REQ_F_NO_FILE_TABLE; | |
eddc7ef5 | 4403 | return -EAGAIN; |
5b0bbee4 | 4404 | } |
eddc7ef5 | 4405 | |
e62753e4 BM |
4406 | ret = do_statx(ctx->dfd, ctx->filename, ctx->flags, ctx->mask, |
4407 | ctx->buffer); | |
eddc7ef5 | 4408 | |
eddc7ef5 JA |
4409 | if (ret < 0) |
4410 | req_set_fail_links(req); | |
e1e16097 | 4411 | io_req_complete(req, ret); |
eddc7ef5 JA |
4412 | return 0; |
4413 | } | |
4414 | ||
b5dba59e JA |
4415 | static int io_close_prep(struct io_kiocb *req, const struct io_uring_sqe *sqe) |
4416 | { | |
4417 | /* | |
4418 | * If we queue this for async, it must not be cancellable. That would | |
7cdaf587 XW |
4419 | * leave the 'file' in an undeterminate state, and here need to modify |
4420 | * io_wq_work.flags, so initialize io_wq_work firstly. | |
b5dba59e | 4421 | */ |
7cdaf587 | 4422 | io_req_init_async(req); |
b5dba59e JA |
4423 | req->work.flags |= IO_WQ_WORK_NO_CANCEL; |
4424 | ||
14587a46 | 4425 | if (unlikely(req->ctx->flags & IORING_SETUP_IOPOLL)) |
3232dd02 | 4426 | return -EINVAL; |
b5dba59e JA |
4427 | if (sqe->ioprio || sqe->off || sqe->addr || sqe->len || |
4428 | sqe->rw_flags || sqe->buf_index) | |
4429 | return -EINVAL; | |
9c280f90 | 4430 | if (req->flags & REQ_F_FIXED_FILE) |
cf3040ca | 4431 | return -EBADF; |
b5dba59e JA |
4432 | |
4433 | req->close.fd = READ_ONCE(sqe->fd); | |
0f212204 | 4434 | if ((req->file && req->file->f_op == &io_uring_fops)) |
fd2206e4 | 4435 | return -EBADF; |
b5dba59e | 4436 | |
3af73b28 | 4437 | req->close.put_file = NULL; |
b5dba59e | 4438 | return 0; |
b5dba59e JA |
4439 | } |
4440 | ||
229a7b63 JA |
4441 | static int io_close(struct io_kiocb *req, bool force_nonblock, |
4442 | struct io_comp_state *cs) | |
b5dba59e | 4443 | { |
3af73b28 | 4444 | struct io_close *close = &req->close; |
b5dba59e JA |
4445 | int ret; |
4446 | ||
3af73b28 PB |
4447 | /* might be already done during nonblock submission */ |
4448 | if (!close->put_file) { | |
4449 | ret = __close_fd_get_file(close->fd, &close->put_file); | |
4450 | if (ret < 0) | |
4451 | return (ret == -ENOENT) ? -EBADF : ret; | |
4452 | } | |
b5dba59e JA |
4453 | |
4454 | /* if the file has a flush method, be safe and punt to async */ | |
3af73b28 | 4455 | if (close->put_file->f_op->flush && force_nonblock) { |
24c74678 PB |
4456 | /* was never set, but play safe */ |
4457 | req->flags &= ~REQ_F_NOWAIT; | |
0bf0eefd | 4458 | /* avoid grabbing files - we don't need the files */ |
24c74678 | 4459 | req->flags |= REQ_F_NO_FILE_TABLE; |
0bf0eefd | 4460 | return -EAGAIN; |
a2100672 | 4461 | } |
b5dba59e | 4462 | |
3af73b28 | 4463 | /* No ->flush() or already async, safely close from here */ |
98447d65 | 4464 | ret = filp_close(close->put_file, req->work.identity->files); |
3af73b28 PB |
4465 | if (ret < 0) |
4466 | req_set_fail_links(req); | |
3af73b28 PB |
4467 | fput(close->put_file); |
4468 | close->put_file = NULL; | |
229a7b63 | 4469 | __io_req_complete(req, ret, 0, cs); |
1a417f4e | 4470 | return 0; |
b5dba59e JA |
4471 | } |
4472 | ||
3529d8c2 | 4473 | static int io_prep_sfr(struct io_kiocb *req, const struct io_uring_sqe *sqe) |
5d17b4a4 JA |
4474 | { |
4475 | struct io_ring_ctx *ctx = req->ctx; | |
5d17b4a4 JA |
4476 | |
4477 | if (!req->file) | |
4478 | return -EBADF; | |
5d17b4a4 JA |
4479 | |
4480 | if (unlikely(ctx->flags & IORING_SETUP_IOPOLL)) | |
4481 | return -EINVAL; | |
4482 | if (unlikely(sqe->addr || sqe->ioprio || sqe->buf_index)) | |
4483 | return -EINVAL; | |
4484 | ||
8ed8d3c3 JA |
4485 | req->sync.off = READ_ONCE(sqe->off); |
4486 | req->sync.len = READ_ONCE(sqe->len); | |
4487 | req->sync.flags = READ_ONCE(sqe->sync_range_flags); | |
8ed8d3c3 JA |
4488 | return 0; |
4489 | } | |
4490 | ||
ac45abc0 | 4491 | static int io_sync_file_range(struct io_kiocb *req, bool force_nonblock) |
8ed8d3c3 | 4492 | { |
8ed8d3c3 JA |
4493 | int ret; |
4494 | ||
ac45abc0 PB |
4495 | /* sync_file_range always requires a blocking context */ |
4496 | if (force_nonblock) | |
4497 | return -EAGAIN; | |
4498 | ||
9adbd45d | 4499 | ret = sync_file_range(req->file, req->sync.off, req->sync.len, |
8ed8d3c3 JA |
4500 | req->sync.flags); |
4501 | if (ret < 0) | |
4502 | req_set_fail_links(req); | |
e1e16097 | 4503 | io_req_complete(req, ret); |
5d17b4a4 JA |
4504 | return 0; |
4505 | } | |
4506 | ||
469956e8 | 4507 | #if defined(CONFIG_NET) |
02d27d89 PB |
4508 | static int io_setup_async_msg(struct io_kiocb *req, |
4509 | struct io_async_msghdr *kmsg) | |
4510 | { | |
e8c2bc1f JA |
4511 | struct io_async_msghdr *async_msg = req->async_data; |
4512 | ||
4513 | if (async_msg) | |
02d27d89 | 4514 | return -EAGAIN; |
e8c2bc1f | 4515 | if (io_alloc_async_data(req)) { |
02d27d89 PB |
4516 | if (kmsg->iov != kmsg->fast_iov) |
4517 | kfree(kmsg->iov); | |
4518 | return -ENOMEM; | |
4519 | } | |
e8c2bc1f | 4520 | async_msg = req->async_data; |
02d27d89 | 4521 | req->flags |= REQ_F_NEED_CLEANUP; |
e8c2bc1f | 4522 | memcpy(async_msg, kmsg, sizeof(*kmsg)); |
02d27d89 PB |
4523 | return -EAGAIN; |
4524 | } | |
4525 | ||
2ae523ed PB |
4526 | static int io_sendmsg_copy_hdr(struct io_kiocb *req, |
4527 | struct io_async_msghdr *iomsg) | |
4528 | { | |
4529 | iomsg->iov = iomsg->fast_iov; | |
4530 | iomsg->msg.msg_name = &iomsg->addr; | |
4531 | return sendmsg_copy_msghdr(&iomsg->msg, req->sr_msg.umsg, | |
4532 | req->sr_msg.msg_flags, &iomsg->iov); | |
4533 | } | |
4534 | ||
3529d8c2 | 4535 | static int io_sendmsg_prep(struct io_kiocb *req, const struct io_uring_sqe *sqe) |
03b1230c | 4536 | { |
e8c2bc1f | 4537 | struct io_async_msghdr *async_msg = req->async_data; |
e47293fd | 4538 | struct io_sr_msg *sr = &req->sr_msg; |
99bc4c38 | 4539 | int ret; |
03b1230c | 4540 | |
d2b6f48b PB |
4541 | if (unlikely(req->ctx->flags & IORING_SETUP_IOPOLL)) |
4542 | return -EINVAL; | |
4543 | ||
e47293fd | 4544 | sr->msg_flags = READ_ONCE(sqe->msg_flags); |
270a5940 | 4545 | sr->umsg = u64_to_user_ptr(READ_ONCE(sqe->addr)); |
fddaface | 4546 | sr->len = READ_ONCE(sqe->len); |
3529d8c2 | 4547 | |
d8768362 JA |
4548 | #ifdef CONFIG_COMPAT |
4549 | if (req->ctx->compat) | |
4550 | sr->msg_flags |= MSG_CMSG_COMPAT; | |
4551 | #endif | |
4552 | ||
e8c2bc1f | 4553 | if (!async_msg || !io_op_defs[req->opcode].needs_async_data) |
3529d8c2 | 4554 | return 0; |
e8c2bc1f | 4555 | ret = io_sendmsg_copy_hdr(req, async_msg); |
99bc4c38 PB |
4556 | if (!ret) |
4557 | req->flags |= REQ_F_NEED_CLEANUP; | |
4558 | return ret; | |
03b1230c JA |
4559 | } |
4560 | ||
229a7b63 JA |
4561 | static int io_sendmsg(struct io_kiocb *req, bool force_nonblock, |
4562 | struct io_comp_state *cs) | |
aa1fa28f | 4563 | { |
6b754c8b | 4564 | struct io_async_msghdr iomsg, *kmsg; |
0fa03c62 | 4565 | struct socket *sock; |
7a7cacba | 4566 | unsigned flags; |
0fa03c62 JA |
4567 | int ret; |
4568 | ||
0fa03c62 | 4569 | sock = sock_from_file(req->file, &ret); |
7a7cacba PB |
4570 | if (unlikely(!sock)) |
4571 | return ret; | |
3529d8c2 | 4572 | |
e8c2bc1f JA |
4573 | if (req->async_data) { |
4574 | kmsg = req->async_data; | |
4575 | kmsg->msg.msg_name = &kmsg->addr; | |
7a7cacba PB |
4576 | /* if iov is set, it's allocated already */ |
4577 | if (!kmsg->iov) | |
4578 | kmsg->iov = kmsg->fast_iov; | |
4579 | kmsg->msg.msg_iter.iov = kmsg->iov; | |
4580 | } else { | |
4581 | ret = io_sendmsg_copy_hdr(req, &iomsg); | |
4582 | if (ret) | |
4583 | return ret; | |
4584 | kmsg = &iomsg; | |
0fa03c62 | 4585 | } |
0fa03c62 | 4586 | |
7a7cacba PB |
4587 | flags = req->sr_msg.msg_flags; |
4588 | if (flags & MSG_DONTWAIT) | |
4589 | req->flags |= REQ_F_NOWAIT; | |
4590 | else if (force_nonblock) | |
4591 | flags |= MSG_DONTWAIT; | |
e47293fd | 4592 | |
7a7cacba PB |
4593 | ret = __sys_sendmsg_sock(sock, &kmsg->msg, flags); |
4594 | if (force_nonblock && ret == -EAGAIN) | |
4595 | return io_setup_async_msg(req, kmsg); | |
4596 | if (ret == -ERESTARTSYS) | |
4597 | ret = -EINTR; | |
0fa03c62 | 4598 | |
6b754c8b | 4599 | if (kmsg->iov != kmsg->fast_iov) |
0b416c3e | 4600 | kfree(kmsg->iov); |
99bc4c38 | 4601 | req->flags &= ~REQ_F_NEED_CLEANUP; |
4e88d6e7 JA |
4602 | if (ret < 0) |
4603 | req_set_fail_links(req); | |
229a7b63 | 4604 | __io_req_complete(req, ret, 0, cs); |
5d17b4a4 | 4605 | return 0; |
03b1230c | 4606 | } |
aa1fa28f | 4607 | |
229a7b63 JA |
4608 | static int io_send(struct io_kiocb *req, bool force_nonblock, |
4609 | struct io_comp_state *cs) | |
fddaface | 4610 | { |
7a7cacba PB |
4611 | struct io_sr_msg *sr = &req->sr_msg; |
4612 | struct msghdr msg; | |
4613 | struct iovec iov; | |
fddaface | 4614 | struct socket *sock; |
7a7cacba | 4615 | unsigned flags; |
fddaface JA |
4616 | int ret; |
4617 | ||
fddaface | 4618 | sock = sock_from_file(req->file, &ret); |
7a7cacba PB |
4619 | if (unlikely(!sock)) |
4620 | return ret; | |
fddaface | 4621 | |
7a7cacba PB |
4622 | ret = import_single_range(WRITE, sr->buf, sr->len, &iov, &msg.msg_iter); |
4623 | if (unlikely(ret)) | |
14db8411 | 4624 | return ret; |
fddaface | 4625 | |
7a7cacba PB |
4626 | msg.msg_name = NULL; |
4627 | msg.msg_control = NULL; | |
4628 | msg.msg_controllen = 0; | |
4629 | msg.msg_namelen = 0; | |
fddaface | 4630 | |
7a7cacba PB |
4631 | flags = req->sr_msg.msg_flags; |
4632 | if (flags & MSG_DONTWAIT) | |
4633 | req->flags |= REQ_F_NOWAIT; | |
4634 | else if (force_nonblock) | |
4635 | flags |= MSG_DONTWAIT; | |
fddaface | 4636 | |
7a7cacba PB |
4637 | msg.msg_flags = flags; |
4638 | ret = sock_sendmsg(sock, &msg); | |
4639 | if (force_nonblock && ret == -EAGAIN) | |
4640 | return -EAGAIN; | |
4641 | if (ret == -ERESTARTSYS) | |
4642 | ret = -EINTR; | |
fddaface | 4643 | |
fddaface JA |
4644 | if (ret < 0) |
4645 | req_set_fail_links(req); | |
229a7b63 | 4646 | __io_req_complete(req, ret, 0, cs); |
fddaface | 4647 | return 0; |
fddaface JA |
4648 | } |
4649 | ||
1400e697 PB |
4650 | static int __io_recvmsg_copy_hdr(struct io_kiocb *req, |
4651 | struct io_async_msghdr *iomsg) | |
52de1fe1 JA |
4652 | { |
4653 | struct io_sr_msg *sr = &req->sr_msg; | |
4654 | struct iovec __user *uiov; | |
4655 | size_t iov_len; | |
4656 | int ret; | |
4657 | ||
1400e697 PB |
4658 | ret = __copy_msghdr_from_user(&iomsg->msg, sr->umsg, |
4659 | &iomsg->uaddr, &uiov, &iov_len); | |
52de1fe1 JA |
4660 | if (ret) |
4661 | return ret; | |
4662 | ||
4663 | if (req->flags & REQ_F_BUFFER_SELECT) { | |
4664 | if (iov_len > 1) | |
4665 | return -EINVAL; | |
1400e697 | 4666 | if (copy_from_user(iomsg->iov, uiov, sizeof(*uiov))) |
52de1fe1 | 4667 | return -EFAULT; |
1400e697 PB |
4668 | sr->len = iomsg->iov[0].iov_len; |
4669 | iov_iter_init(&iomsg->msg.msg_iter, READ, iomsg->iov, 1, | |
52de1fe1 | 4670 | sr->len); |
1400e697 | 4671 | iomsg->iov = NULL; |
52de1fe1 | 4672 | } else { |
89cd35c5 CH |
4673 | ret = __import_iovec(READ, uiov, iov_len, UIO_FASTIOV, |
4674 | &iomsg->iov, &iomsg->msg.msg_iter, | |
4675 | false); | |
52de1fe1 JA |
4676 | if (ret > 0) |
4677 | ret = 0; | |
4678 | } | |
4679 | ||
4680 | return ret; | |
4681 | } | |
4682 | ||
4683 | #ifdef CONFIG_COMPAT | |
4684 | static int __io_compat_recvmsg_copy_hdr(struct io_kiocb *req, | |
1400e697 | 4685 | struct io_async_msghdr *iomsg) |
52de1fe1 JA |
4686 | { |
4687 | struct compat_msghdr __user *msg_compat; | |
4688 | struct io_sr_msg *sr = &req->sr_msg; | |
4689 | struct compat_iovec __user *uiov; | |
4690 | compat_uptr_t ptr; | |
4691 | compat_size_t len; | |
4692 | int ret; | |
4693 | ||
270a5940 | 4694 | msg_compat = (struct compat_msghdr __user *) sr->umsg; |
1400e697 | 4695 | ret = __get_compat_msghdr(&iomsg->msg, msg_compat, &iomsg->uaddr, |
52de1fe1 JA |
4696 | &ptr, &len); |
4697 | if (ret) | |
4698 | return ret; | |
4699 | ||
4700 | uiov = compat_ptr(ptr); | |
4701 | if (req->flags & REQ_F_BUFFER_SELECT) { | |
4702 | compat_ssize_t clen; | |
4703 | ||
4704 | if (len > 1) | |
4705 | return -EINVAL; | |
4706 | if (!access_ok(uiov, sizeof(*uiov))) | |
4707 | return -EFAULT; | |
4708 | if (__get_user(clen, &uiov->iov_len)) | |
4709 | return -EFAULT; | |
4710 | if (clen < 0) | |
4711 | return -EINVAL; | |
1400e697 PB |
4712 | sr->len = iomsg->iov[0].iov_len; |
4713 | iomsg->iov = NULL; | |
52de1fe1 | 4714 | } else { |
89cd35c5 CH |
4715 | ret = __import_iovec(READ, (struct iovec __user *)uiov, len, |
4716 | UIO_FASTIOV, &iomsg->iov, | |
4717 | &iomsg->msg.msg_iter, true); | |
52de1fe1 JA |
4718 | if (ret < 0) |
4719 | return ret; | |
4720 | } | |
4721 | ||
4722 | return 0; | |
4723 | } | |
4724 | #endif | |
4725 | ||
1400e697 PB |
4726 | static int io_recvmsg_copy_hdr(struct io_kiocb *req, |
4727 | struct io_async_msghdr *iomsg) | |
52de1fe1 | 4728 | { |
1400e697 PB |
4729 | iomsg->msg.msg_name = &iomsg->addr; |
4730 | iomsg->iov = iomsg->fast_iov; | |
52de1fe1 JA |
4731 | |
4732 | #ifdef CONFIG_COMPAT | |
4733 | if (req->ctx->compat) | |
1400e697 | 4734 | return __io_compat_recvmsg_copy_hdr(req, iomsg); |
fddaface | 4735 | #endif |
52de1fe1 | 4736 | |
1400e697 | 4737 | return __io_recvmsg_copy_hdr(req, iomsg); |
52de1fe1 JA |
4738 | } |
4739 | ||
bcda7baa | 4740 | static struct io_buffer *io_recv_buffer_select(struct io_kiocb *req, |
7fbb1b54 | 4741 | bool needs_lock) |
bcda7baa JA |
4742 | { |
4743 | struct io_sr_msg *sr = &req->sr_msg; | |
4744 | struct io_buffer *kbuf; | |
4745 | ||
bcda7baa JA |
4746 | kbuf = io_buffer_select(req, &sr->len, sr->bgid, sr->kbuf, needs_lock); |
4747 | if (IS_ERR(kbuf)) | |
4748 | return kbuf; | |
4749 | ||
4750 | sr->kbuf = kbuf; | |
4751 | req->flags |= REQ_F_BUFFER_SELECTED; | |
bcda7baa | 4752 | return kbuf; |
fddaface JA |
4753 | } |
4754 | ||
7fbb1b54 PB |
4755 | static inline unsigned int io_put_recv_kbuf(struct io_kiocb *req) |
4756 | { | |
4757 | return io_put_kbuf(req, req->sr_msg.kbuf); | |
4758 | } | |
4759 | ||
3529d8c2 JA |
4760 | static int io_recvmsg_prep(struct io_kiocb *req, |
4761 | const struct io_uring_sqe *sqe) | |
aa1fa28f | 4762 | { |
e8c2bc1f | 4763 | struct io_async_msghdr *async_msg = req->async_data; |
e47293fd | 4764 | struct io_sr_msg *sr = &req->sr_msg; |
99bc4c38 | 4765 | int ret; |
3529d8c2 | 4766 | |
d2b6f48b PB |
4767 | if (unlikely(req->ctx->flags & IORING_SETUP_IOPOLL)) |
4768 | return -EINVAL; | |
4769 | ||
3529d8c2 | 4770 | sr->msg_flags = READ_ONCE(sqe->msg_flags); |
270a5940 | 4771 | sr->umsg = u64_to_user_ptr(READ_ONCE(sqe->addr)); |
0b7b21e4 | 4772 | sr->len = READ_ONCE(sqe->len); |
bcda7baa | 4773 | sr->bgid = READ_ONCE(sqe->buf_group); |
06b76d44 | 4774 | |
d8768362 JA |
4775 | #ifdef CONFIG_COMPAT |
4776 | if (req->ctx->compat) | |
4777 | sr->msg_flags |= MSG_CMSG_COMPAT; | |
4778 | #endif | |
4779 | ||
e8c2bc1f | 4780 | if (!async_msg || !io_op_defs[req->opcode].needs_async_data) |
5f798bea | 4781 | return 0; |
e8c2bc1f | 4782 | ret = io_recvmsg_copy_hdr(req, async_msg); |
99bc4c38 PB |
4783 | if (!ret) |
4784 | req->flags |= REQ_F_NEED_CLEANUP; | |
4785 | return ret; | |
aa1fa28f JA |
4786 | } |
4787 | ||
229a7b63 JA |
4788 | static int io_recvmsg(struct io_kiocb *req, bool force_nonblock, |
4789 | struct io_comp_state *cs) | |
aa1fa28f | 4790 | { |
6b754c8b | 4791 | struct io_async_msghdr iomsg, *kmsg; |
03b1230c | 4792 | struct socket *sock; |
7fbb1b54 | 4793 | struct io_buffer *kbuf; |
7a7cacba | 4794 | unsigned flags; |
52de1fe1 | 4795 | int ret, cflags = 0; |
03b1230c | 4796 | |
03b1230c | 4797 | sock = sock_from_file(req->file, &ret); |
7a7cacba PB |
4798 | if (unlikely(!sock)) |
4799 | return ret; | |
3529d8c2 | 4800 | |
e8c2bc1f JA |
4801 | if (req->async_data) { |
4802 | kmsg = req->async_data; | |
4803 | kmsg->msg.msg_name = &kmsg->addr; | |
7a7cacba PB |
4804 | /* if iov is set, it's allocated already */ |
4805 | if (!kmsg->iov) | |
4806 | kmsg->iov = kmsg->fast_iov; | |
4807 | kmsg->msg.msg_iter.iov = kmsg->iov; | |
4808 | } else { | |
4809 | ret = io_recvmsg_copy_hdr(req, &iomsg); | |
4810 | if (ret) | |
681fda8d | 4811 | return ret; |
7a7cacba PB |
4812 | kmsg = &iomsg; |
4813 | } | |
03b1230c | 4814 | |
bc02ef33 | 4815 | if (req->flags & REQ_F_BUFFER_SELECT) { |
7fbb1b54 | 4816 | kbuf = io_recv_buffer_select(req, !force_nonblock); |
bc02ef33 | 4817 | if (IS_ERR(kbuf)) |
52de1fe1 | 4818 | return PTR_ERR(kbuf); |
7a7cacba PB |
4819 | kmsg->fast_iov[0].iov_base = u64_to_user_ptr(kbuf->addr); |
4820 | iov_iter_init(&kmsg->msg.msg_iter, READ, kmsg->iov, | |
4821 | 1, req->sr_msg.len); | |
4822 | } | |
52de1fe1 | 4823 | |
7a7cacba PB |
4824 | flags = req->sr_msg.msg_flags; |
4825 | if (flags & MSG_DONTWAIT) | |
4826 | req->flags |= REQ_F_NOWAIT; | |
4827 | else if (force_nonblock) | |
4828 | flags |= MSG_DONTWAIT; | |
e47293fd | 4829 | |
7a7cacba PB |
4830 | ret = __sys_recvmsg_sock(sock, &kmsg->msg, req->sr_msg.umsg, |
4831 | kmsg->uaddr, flags); | |
0e1b6fe3 PB |
4832 | if (force_nonblock && ret == -EAGAIN) |
4833 | return io_setup_async_msg(req, kmsg); | |
7a7cacba PB |
4834 | if (ret == -ERESTARTSYS) |
4835 | ret = -EINTR; | |
03b1230c | 4836 | |
7fbb1b54 PB |
4837 | if (req->flags & REQ_F_BUFFER_SELECTED) |
4838 | cflags = io_put_recv_kbuf(req); | |
6b754c8b | 4839 | if (kmsg->iov != kmsg->fast_iov) |
0b416c3e | 4840 | kfree(kmsg->iov); |
99bc4c38 | 4841 | req->flags &= ~REQ_F_NEED_CLEANUP; |
4e88d6e7 JA |
4842 | if (ret < 0) |
4843 | req_set_fail_links(req); | |
229a7b63 | 4844 | __io_req_complete(req, ret, cflags, cs); |
03b1230c | 4845 | return 0; |
0fa03c62 | 4846 | } |
5d17b4a4 | 4847 | |
229a7b63 JA |
4848 | static int io_recv(struct io_kiocb *req, bool force_nonblock, |
4849 | struct io_comp_state *cs) | |
fddaface | 4850 | { |
6b754c8b | 4851 | struct io_buffer *kbuf; |
7a7cacba PB |
4852 | struct io_sr_msg *sr = &req->sr_msg; |
4853 | struct msghdr msg; | |
4854 | void __user *buf = sr->buf; | |
fddaface | 4855 | struct socket *sock; |
7a7cacba PB |
4856 | struct iovec iov; |
4857 | unsigned flags; | |
bcda7baa | 4858 | int ret, cflags = 0; |
fddaface | 4859 | |
fddaface | 4860 | sock = sock_from_file(req->file, &ret); |
7a7cacba PB |
4861 | if (unlikely(!sock)) |
4862 | return ret; | |
fddaface | 4863 | |
bc02ef33 | 4864 | if (req->flags & REQ_F_BUFFER_SELECT) { |
7fbb1b54 | 4865 | kbuf = io_recv_buffer_select(req, !force_nonblock); |
bcda7baa JA |
4866 | if (IS_ERR(kbuf)) |
4867 | return PTR_ERR(kbuf); | |
7a7cacba | 4868 | buf = u64_to_user_ptr(kbuf->addr); |
bc02ef33 | 4869 | } |
bcda7baa | 4870 | |
7a7cacba | 4871 | ret = import_single_range(READ, buf, sr->len, &iov, &msg.msg_iter); |
14c32eee PB |
4872 | if (unlikely(ret)) |
4873 | goto out_free; | |
fddaface | 4874 | |
7a7cacba PB |
4875 | msg.msg_name = NULL; |
4876 | msg.msg_control = NULL; | |
4877 | msg.msg_controllen = 0; | |
4878 | msg.msg_namelen = 0; | |
4879 | msg.msg_iocb = NULL; | |
4880 | msg.msg_flags = 0; | |
fddaface | 4881 | |
7a7cacba PB |
4882 | flags = req->sr_msg.msg_flags; |
4883 | if (flags & MSG_DONTWAIT) | |
4884 | req->flags |= REQ_F_NOWAIT; | |
4885 | else if (force_nonblock) | |
4886 | flags |= MSG_DONTWAIT; | |
4887 | ||
4888 | ret = sock_recvmsg(sock, &msg, flags); | |
4889 | if (force_nonblock && ret == -EAGAIN) | |
4890 | return -EAGAIN; | |
4891 | if (ret == -ERESTARTSYS) | |
4892 | ret = -EINTR; | |
14c32eee | 4893 | out_free: |
7fbb1b54 PB |
4894 | if (req->flags & REQ_F_BUFFER_SELECTED) |
4895 | cflags = io_put_recv_kbuf(req); | |
fddaface JA |
4896 | if (ret < 0) |
4897 | req_set_fail_links(req); | |
229a7b63 | 4898 | __io_req_complete(req, ret, cflags, cs); |
fddaface | 4899 | return 0; |
fddaface JA |
4900 | } |
4901 | ||
3529d8c2 | 4902 | static int io_accept_prep(struct io_kiocb *req, const struct io_uring_sqe *sqe) |
17f2fe35 | 4903 | { |
8ed8d3c3 JA |
4904 | struct io_accept *accept = &req->accept; |
4905 | ||
14587a46 | 4906 | if (unlikely(req->ctx->flags & IORING_SETUP_IOPOLL)) |
17f2fe35 | 4907 | return -EINVAL; |
8042d6ce | 4908 | if (sqe->ioprio || sqe->len || sqe->buf_index) |
17f2fe35 JA |
4909 | return -EINVAL; |
4910 | ||
d55e5f5b JA |
4911 | accept->addr = u64_to_user_ptr(READ_ONCE(sqe->addr)); |
4912 | accept->addr_len = u64_to_user_ptr(READ_ONCE(sqe->addr2)); | |
8ed8d3c3 | 4913 | accept->flags = READ_ONCE(sqe->accept_flags); |
09952e3e | 4914 | accept->nofile = rlimit(RLIMIT_NOFILE); |
8ed8d3c3 | 4915 | return 0; |
8ed8d3c3 | 4916 | } |
17f2fe35 | 4917 | |
229a7b63 JA |
4918 | static int io_accept(struct io_kiocb *req, bool force_nonblock, |
4919 | struct io_comp_state *cs) | |
8ed8d3c3 JA |
4920 | { |
4921 | struct io_accept *accept = &req->accept; | |
ac45abc0 | 4922 | unsigned int file_flags = force_nonblock ? O_NONBLOCK : 0; |
8ed8d3c3 JA |
4923 | int ret; |
4924 | ||
e697deed JX |
4925 | if (req->file->f_flags & O_NONBLOCK) |
4926 | req->flags |= REQ_F_NOWAIT; | |
4927 | ||
8ed8d3c3 | 4928 | ret = __sys_accept4_file(req->file, file_flags, accept->addr, |
09952e3e JA |
4929 | accept->addr_len, accept->flags, |
4930 | accept->nofile); | |
8ed8d3c3 | 4931 | if (ret == -EAGAIN && force_nonblock) |
17f2fe35 | 4932 | return -EAGAIN; |
ac45abc0 PB |
4933 | if (ret < 0) { |
4934 | if (ret == -ERESTARTSYS) | |
4935 | ret = -EINTR; | |
4e88d6e7 | 4936 | req_set_fail_links(req); |
ac45abc0 | 4937 | } |
229a7b63 | 4938 | __io_req_complete(req, ret, 0, cs); |
17f2fe35 | 4939 | return 0; |
8ed8d3c3 JA |
4940 | } |
4941 | ||
3529d8c2 | 4942 | static int io_connect_prep(struct io_kiocb *req, const struct io_uring_sqe *sqe) |
f499a021 | 4943 | { |
3529d8c2 | 4944 | struct io_connect *conn = &req->connect; |
e8c2bc1f | 4945 | struct io_async_connect *io = req->async_data; |
f499a021 | 4946 | |
14587a46 | 4947 | if (unlikely(req->ctx->flags & IORING_SETUP_IOPOLL)) |
3fbb51c1 JA |
4948 | return -EINVAL; |
4949 | if (sqe->ioprio || sqe->len || sqe->buf_index || sqe->rw_flags) | |
4950 | return -EINVAL; | |
4951 | ||
3529d8c2 JA |
4952 | conn->addr = u64_to_user_ptr(READ_ONCE(sqe->addr)); |
4953 | conn->addr_len = READ_ONCE(sqe->addr2); | |
4954 | ||
4955 | if (!io) | |
4956 | return 0; | |
4957 | ||
4958 | return move_addr_to_kernel(conn->addr, conn->addr_len, | |
e8c2bc1f | 4959 | &io->address); |
f499a021 JA |
4960 | } |
4961 | ||
229a7b63 JA |
4962 | static int io_connect(struct io_kiocb *req, bool force_nonblock, |
4963 | struct io_comp_state *cs) | |
f8e85cf2 | 4964 | { |
e8c2bc1f | 4965 | struct io_async_connect __io, *io; |
f8e85cf2 | 4966 | unsigned file_flags; |
3fbb51c1 | 4967 | int ret; |
f8e85cf2 | 4968 | |
e8c2bc1f JA |
4969 | if (req->async_data) { |
4970 | io = req->async_data; | |
f499a021 | 4971 | } else { |
3529d8c2 JA |
4972 | ret = move_addr_to_kernel(req->connect.addr, |
4973 | req->connect.addr_len, | |
e8c2bc1f | 4974 | &__io.address); |
f499a021 JA |
4975 | if (ret) |
4976 | goto out; | |
4977 | io = &__io; | |
4978 | } | |
4979 | ||
3fbb51c1 JA |
4980 | file_flags = force_nonblock ? O_NONBLOCK : 0; |
4981 | ||
e8c2bc1f | 4982 | ret = __sys_connect_file(req->file, &io->address, |
3fbb51c1 | 4983 | req->connect.addr_len, file_flags); |
87f80d62 | 4984 | if ((ret == -EAGAIN || ret == -EINPROGRESS) && force_nonblock) { |
e8c2bc1f | 4985 | if (req->async_data) |
b7bb4f7d | 4986 | return -EAGAIN; |
e8c2bc1f | 4987 | if (io_alloc_async_data(req)) { |
f499a021 JA |
4988 | ret = -ENOMEM; |
4989 | goto out; | |
4990 | } | |
e8c2bc1f JA |
4991 | io = req->async_data; |
4992 | memcpy(req->async_data, &__io, sizeof(__io)); | |
f8e85cf2 | 4993 | return -EAGAIN; |
f499a021 | 4994 | } |
f8e85cf2 JA |
4995 | if (ret == -ERESTARTSYS) |
4996 | ret = -EINTR; | |
f499a021 | 4997 | out: |
4e88d6e7 JA |
4998 | if (ret < 0) |
4999 | req_set_fail_links(req); | |
229a7b63 | 5000 | __io_req_complete(req, ret, 0, cs); |
f8e85cf2 | 5001 | return 0; |
469956e8 Y |
5002 | } |
5003 | #else /* !CONFIG_NET */ | |
5004 | static int io_sendmsg_prep(struct io_kiocb *req, const struct io_uring_sqe *sqe) | |
5005 | { | |
f8e85cf2 | 5006 | return -EOPNOTSUPP; |
f8e85cf2 JA |
5007 | } |
5008 | ||
1e16c2f9 RD |
5009 | static int io_sendmsg(struct io_kiocb *req, bool force_nonblock, |
5010 | struct io_comp_state *cs) | |
469956e8 Y |
5011 | { |
5012 | return -EOPNOTSUPP; | |
5013 | } | |
5014 | ||
1e16c2f9 RD |
5015 | static int io_send(struct io_kiocb *req, bool force_nonblock, |
5016 | struct io_comp_state *cs) | |
469956e8 Y |
5017 | { |
5018 | return -EOPNOTSUPP; | |
5019 | } | |
5020 | ||
5021 | static int io_recvmsg_prep(struct io_kiocb *req, | |
5022 | const struct io_uring_sqe *sqe) | |
5023 | { | |
5024 | return -EOPNOTSUPP; | |
5025 | } | |
5026 | ||
1e16c2f9 RD |
5027 | static int io_recvmsg(struct io_kiocb *req, bool force_nonblock, |
5028 | struct io_comp_state *cs) | |
469956e8 Y |
5029 | { |
5030 | return -EOPNOTSUPP; | |
5031 | } | |
5032 | ||
1e16c2f9 RD |
5033 | static int io_recv(struct io_kiocb *req, bool force_nonblock, |
5034 | struct io_comp_state *cs) | |
469956e8 Y |
5035 | { |
5036 | return -EOPNOTSUPP; | |
5037 | } | |
5038 | ||
5039 | static int io_accept_prep(struct io_kiocb *req, const struct io_uring_sqe *sqe) | |
5040 | { | |
5041 | return -EOPNOTSUPP; | |
5042 | } | |
5043 | ||
1e16c2f9 RD |
5044 | static int io_accept(struct io_kiocb *req, bool force_nonblock, |
5045 | struct io_comp_state *cs) | |
469956e8 Y |
5046 | { |
5047 | return -EOPNOTSUPP; | |
5048 | } | |
ce593a6c | 5049 | |
469956e8 Y |
5050 | static int io_connect_prep(struct io_kiocb *req, const struct io_uring_sqe *sqe) |
5051 | { | |
5052 | return -EOPNOTSUPP; | |
5053 | } | |
5054 | ||
1e16c2f9 RD |
5055 | static int io_connect(struct io_kiocb *req, bool force_nonblock, |
5056 | struct io_comp_state *cs) | |
469956e8 | 5057 | { |
f8e85cf2 | 5058 | return -EOPNOTSUPP; |
ce593a6c | 5059 | } |
469956e8 | 5060 | #endif /* CONFIG_NET */ |
f8e85cf2 | 5061 | |
d7718a9d JA |
5062 | struct io_poll_table { |
5063 | struct poll_table_struct pt; | |
5064 | struct io_kiocb *req; | |
5065 | int error; | |
5066 | }; | |
ce593a6c | 5067 | |
d7718a9d JA |
5068 | static int __io_async_wake(struct io_kiocb *req, struct io_poll_iocb *poll, |
5069 | __poll_t mask, task_work_func_t func) | |
5070 | { | |
fd7d6de2 | 5071 | bool twa_signal_ok; |
aa96bf8a | 5072 | int ret; |
d7718a9d JA |
5073 | |
5074 | /* for instances that support it check for an event match first: */ | |
5075 | if (mask && !(mask & poll->events)) | |
5076 | return 0; | |
5077 | ||
5078 | trace_io_uring_task_add(req->ctx, req->opcode, req->user_data, mask); | |
5079 | ||
5080 | list_del_init(&poll->wait.entry); | |
5081 | ||
d7718a9d JA |
5082 | req->result = mask; |
5083 | init_task_work(&req->task_work, func); | |
6d816e08 JA |
5084 | percpu_ref_get(&req->ctx->refs); |
5085 | ||
fd7d6de2 JA |
5086 | /* |
5087 | * If we using the signalfd wait_queue_head for this wakeup, then | |
5088 | * it's not safe to use TWA_SIGNAL as we could be recursing on the | |
5089 | * tsk->sighand->siglock on doing the wakeup. Should not be needed | |
5090 | * either, as the normal wakeup will suffice. | |
5091 | */ | |
5092 | twa_signal_ok = (poll->head != &req->task->sighand->signalfd_wqh); | |
5093 | ||
d7718a9d | 5094 | /* |
e3aabf95 JA |
5095 | * If this fails, then the task is exiting. When a task exits, the |
5096 | * work gets canceled, so just cancel this request as well instead | |
5097 | * of executing it. We can't safely execute it anyway, as we may not | |
5098 | * have the needed state needed for it anyway. | |
d7718a9d | 5099 | */ |
87c4311f | 5100 | ret = io_req_task_work_add(req, twa_signal_ok); |
aa96bf8a | 5101 | if (unlikely(ret)) { |
c2c4c83c JA |
5102 | struct task_struct *tsk; |
5103 | ||
e3aabf95 | 5104 | WRITE_ONCE(poll->canceled, true); |
aa96bf8a | 5105 | tsk = io_wq_get_task(req->ctx->io_wq); |
91989c70 | 5106 | task_work_add(tsk, &req->task_work, TWA_NONE); |
ce593a6c | 5107 | wake_up_process(tsk); |
aa96bf8a | 5108 | } |
d7718a9d JA |
5109 | return 1; |
5110 | } | |
5111 | ||
74ce6ce4 JA |
5112 | static bool io_poll_rewait(struct io_kiocb *req, struct io_poll_iocb *poll) |
5113 | __acquires(&req->ctx->completion_lock) | |
5114 | { | |
5115 | struct io_ring_ctx *ctx = req->ctx; | |
5116 | ||
5117 | if (!req->result && !READ_ONCE(poll->canceled)) { | |
5118 | struct poll_table_struct pt = { ._key = poll->events }; | |
5119 | ||
5120 | req->result = vfs_poll(req->file, &pt) & poll->events; | |
5121 | } | |
5122 | ||
5123 | spin_lock_irq(&ctx->completion_lock); | |
5124 | if (!req->result && !READ_ONCE(poll->canceled)) { | |
5125 | add_wait_queue(poll->head, &poll->wait); | |
5126 | return true; | |
5127 | } | |
5128 | ||
5129 | return false; | |
5130 | } | |
5131 | ||
d4e7cd36 | 5132 | static struct io_poll_iocb *io_poll_get_double(struct io_kiocb *req) |
18bceab1 | 5133 | { |
e8c2bc1f | 5134 | /* pure poll stashes this in ->async_data, poll driven retry elsewhere */ |
d4e7cd36 | 5135 | if (req->opcode == IORING_OP_POLL_ADD) |
e8c2bc1f | 5136 | return req->async_data; |
d4e7cd36 JA |
5137 | return req->apoll->double_poll; |
5138 | } | |
5139 | ||
5140 | static struct io_poll_iocb *io_poll_get_single(struct io_kiocb *req) | |
5141 | { | |
5142 | if (req->opcode == IORING_OP_POLL_ADD) | |
5143 | return &req->poll; | |
5144 | return &req->apoll->poll; | |
5145 | } | |
5146 | ||
5147 | static void io_poll_remove_double(struct io_kiocb *req) | |
5148 | { | |
5149 | struct io_poll_iocb *poll = io_poll_get_double(req); | |
18bceab1 JA |
5150 | |
5151 | lockdep_assert_held(&req->ctx->completion_lock); | |
5152 | ||
5153 | if (poll && poll->head) { | |
5154 | struct wait_queue_head *head = poll->head; | |
5155 | ||
5156 | spin_lock(&head->lock); | |
5157 | list_del_init(&poll->wait.entry); | |
5158 | if (poll->wait.private) | |
5159 | refcount_dec(&req->refs); | |
5160 | poll->head = NULL; | |
5161 | spin_unlock(&head->lock); | |
5162 | } | |
5163 | } | |
5164 | ||
5165 | static void io_poll_complete(struct io_kiocb *req, __poll_t mask, int error) | |
5166 | { | |
5167 | struct io_ring_ctx *ctx = req->ctx; | |
5168 | ||
d4e7cd36 | 5169 | io_poll_remove_double(req); |
18bceab1 JA |
5170 | req->poll.done = true; |
5171 | io_cqring_fill_event(req, error ? error : mangle_poll(mask)); | |
5172 | io_commit_cqring(ctx); | |
5173 | } | |
5174 | ||
dd221f46 | 5175 | static void io_poll_task_func(struct callback_head *cb) |
18bceab1 | 5176 | { |
dd221f46 | 5177 | struct io_kiocb *req = container_of(cb, struct io_kiocb, task_work); |
18bceab1 | 5178 | struct io_ring_ctx *ctx = req->ctx; |
dd221f46 | 5179 | struct io_kiocb *nxt; |
18bceab1 JA |
5180 | |
5181 | if (io_poll_rewait(req, &req->poll)) { | |
5182 | spin_unlock_irq(&ctx->completion_lock); | |
dd221f46 PB |
5183 | } else { |
5184 | hash_del(&req->hash_node); | |
5185 | io_poll_complete(req, req->result, 0); | |
5186 | spin_unlock_irq(&ctx->completion_lock); | |
18bceab1 | 5187 | |
dd221f46 PB |
5188 | nxt = io_put_req_find_next(req); |
5189 | io_cqring_ev_posted(ctx); | |
5190 | if (nxt) | |
5191 | __io_req_task_submit(nxt); | |
5192 | } | |
18bceab1 | 5193 | |
6d816e08 | 5194 | percpu_ref_put(&ctx->refs); |
18bceab1 JA |
5195 | } |
5196 | ||
5197 | static int io_poll_double_wake(struct wait_queue_entry *wait, unsigned mode, | |
5198 | int sync, void *key) | |
5199 | { | |
5200 | struct io_kiocb *req = wait->private; | |
d4e7cd36 | 5201 | struct io_poll_iocb *poll = io_poll_get_single(req); |
18bceab1 JA |
5202 | __poll_t mask = key_to_poll(key); |
5203 | ||
5204 | /* for instances that support it check for an event match first: */ | |
5205 | if (mask && !(mask & poll->events)) | |
5206 | return 0; | |
5207 | ||
8706e04e JA |
5208 | list_del_init(&wait->entry); |
5209 | ||
807abcb0 | 5210 | if (poll && poll->head) { |
18bceab1 JA |
5211 | bool done; |
5212 | ||
807abcb0 JA |
5213 | spin_lock(&poll->head->lock); |
5214 | done = list_empty(&poll->wait.entry); | |
18bceab1 | 5215 | if (!done) |
807abcb0 | 5216 | list_del_init(&poll->wait.entry); |
d4e7cd36 JA |
5217 | /* make sure double remove sees this as being gone */ |
5218 | wait->private = NULL; | |
807abcb0 | 5219 | spin_unlock(&poll->head->lock); |
c8b5e260 JA |
5220 | if (!done) { |
5221 | /* use wait func handler, so it matches the rq type */ | |
5222 | poll->wait.func(&poll->wait, mode, sync, key); | |
5223 | } | |
18bceab1 JA |
5224 | } |
5225 | refcount_dec(&req->refs); | |
5226 | return 1; | |
5227 | } | |
5228 | ||
5229 | static void io_init_poll_iocb(struct io_poll_iocb *poll, __poll_t events, | |
5230 | wait_queue_func_t wake_func) | |
5231 | { | |
5232 | poll->head = NULL; | |
5233 | poll->done = false; | |
5234 | poll->canceled = false; | |
5235 | poll->events = events; | |
5236 | INIT_LIST_HEAD(&poll->wait.entry); | |
5237 | init_waitqueue_func_entry(&poll->wait, wake_func); | |
5238 | } | |
5239 | ||
5240 | static void __io_queue_proc(struct io_poll_iocb *poll, struct io_poll_table *pt, | |
807abcb0 JA |
5241 | struct wait_queue_head *head, |
5242 | struct io_poll_iocb **poll_ptr) | |
18bceab1 JA |
5243 | { |
5244 | struct io_kiocb *req = pt->req; | |
5245 | ||
5246 | /* | |
5247 | * If poll->head is already set, it's because the file being polled | |
5248 | * uses multiple waitqueues for poll handling (eg one for read, one | |
5249 | * for write). Setup a separate io_poll_iocb if this happens. | |
5250 | */ | |
5251 | if (unlikely(poll->head)) { | |
58852d4d PB |
5252 | struct io_poll_iocb *poll_one = poll; |
5253 | ||
18bceab1 | 5254 | /* already have a 2nd entry, fail a third attempt */ |
807abcb0 | 5255 | if (*poll_ptr) { |
18bceab1 JA |
5256 | pt->error = -EINVAL; |
5257 | return; | |
5258 | } | |
5259 | poll = kmalloc(sizeof(*poll), GFP_ATOMIC); | |
5260 | if (!poll) { | |
5261 | pt->error = -ENOMEM; | |
5262 | return; | |
5263 | } | |
58852d4d | 5264 | io_init_poll_iocb(poll, poll_one->events, io_poll_double_wake); |
18bceab1 JA |
5265 | refcount_inc(&req->refs); |
5266 | poll->wait.private = req; | |
807abcb0 | 5267 | *poll_ptr = poll; |
18bceab1 JA |
5268 | } |
5269 | ||
5270 | pt->error = 0; | |
5271 | poll->head = head; | |
a31eb4a2 JX |
5272 | |
5273 | if (poll->events & EPOLLEXCLUSIVE) | |
5274 | add_wait_queue_exclusive(head, &poll->wait); | |
5275 | else | |
5276 | add_wait_queue(head, &poll->wait); | |
18bceab1 JA |
5277 | } |
5278 | ||
5279 | static void io_async_queue_proc(struct file *file, struct wait_queue_head *head, | |
5280 | struct poll_table_struct *p) | |
5281 | { | |
5282 | struct io_poll_table *pt = container_of(p, struct io_poll_table, pt); | |
807abcb0 | 5283 | struct async_poll *apoll = pt->req->apoll; |
18bceab1 | 5284 | |
807abcb0 | 5285 | __io_queue_proc(&apoll->poll, pt, head, &apoll->double_poll); |
18bceab1 JA |
5286 | } |
5287 | ||
d7718a9d JA |
5288 | static void io_async_task_func(struct callback_head *cb) |
5289 | { | |
5290 | struct io_kiocb *req = container_of(cb, struct io_kiocb, task_work); | |
5291 | struct async_poll *apoll = req->apoll; | |
5292 | struct io_ring_ctx *ctx = req->ctx; | |
5293 | ||
5294 | trace_io_uring_task_run(req->ctx, req->opcode, req->user_data); | |
5295 | ||
74ce6ce4 | 5296 | if (io_poll_rewait(req, &apoll->poll)) { |
d7718a9d | 5297 | spin_unlock_irq(&ctx->completion_lock); |
6d816e08 | 5298 | percpu_ref_put(&ctx->refs); |
74ce6ce4 | 5299 | return; |
d7718a9d JA |
5300 | } |
5301 | ||
31067255 | 5302 | /* If req is still hashed, it cannot have been canceled. Don't check. */ |
0be0b0e3 | 5303 | if (hash_hashed(&req->hash_node)) |
74ce6ce4 | 5304 | hash_del(&req->hash_node); |
2bae047e | 5305 | |
d4e7cd36 | 5306 | io_poll_remove_double(req); |
74ce6ce4 JA |
5307 | spin_unlock_irq(&ctx->completion_lock); |
5308 | ||
0be0b0e3 PB |
5309 | if (!READ_ONCE(apoll->poll.canceled)) |
5310 | __io_req_task_submit(req); | |
5311 | else | |
5312 | __io_req_task_cancel(req, -ECANCELED); | |
aa340845 | 5313 | |
6d816e08 | 5314 | percpu_ref_put(&ctx->refs); |
807abcb0 | 5315 | kfree(apoll->double_poll); |
31067255 | 5316 | kfree(apoll); |
d7718a9d JA |
5317 | } |
5318 | ||
5319 | static int io_async_wake(struct wait_queue_entry *wait, unsigned mode, int sync, | |
5320 | void *key) | |
5321 | { | |
5322 | struct io_kiocb *req = wait->private; | |
5323 | struct io_poll_iocb *poll = &req->apoll->poll; | |
5324 | ||
5325 | trace_io_uring_poll_wake(req->ctx, req->opcode, req->user_data, | |
5326 | key_to_poll(key)); | |
5327 | ||
5328 | return __io_async_wake(req, poll, key_to_poll(key), io_async_task_func); | |
5329 | } | |
5330 | ||
5331 | static void io_poll_req_insert(struct io_kiocb *req) | |
5332 | { | |
5333 | struct io_ring_ctx *ctx = req->ctx; | |
5334 | struct hlist_head *list; | |
5335 | ||
5336 | list = &ctx->cancel_hash[hash_long(req->user_data, ctx->cancel_hash_bits)]; | |
5337 | hlist_add_head(&req->hash_node, list); | |
5338 | } | |
5339 | ||
5340 | static __poll_t __io_arm_poll_handler(struct io_kiocb *req, | |
5341 | struct io_poll_iocb *poll, | |
5342 | struct io_poll_table *ipt, __poll_t mask, | |
5343 | wait_queue_func_t wake_func) | |
5344 | __acquires(&ctx->completion_lock) | |
5345 | { | |
5346 | struct io_ring_ctx *ctx = req->ctx; | |
5347 | bool cancel = false; | |
5348 | ||
4d52f338 | 5349 | INIT_HLIST_NODE(&req->hash_node); |
18bceab1 | 5350 | io_init_poll_iocb(poll, mask, wake_func); |
b90cd197 | 5351 | poll->file = req->file; |
18bceab1 | 5352 | poll->wait.private = req; |
d7718a9d JA |
5353 | |
5354 | ipt->pt._key = mask; | |
5355 | ipt->req = req; | |
5356 | ipt->error = -EINVAL; | |
5357 | ||
d7718a9d JA |
5358 | mask = vfs_poll(req->file, &ipt->pt) & poll->events; |
5359 | ||
5360 | spin_lock_irq(&ctx->completion_lock); | |
5361 | if (likely(poll->head)) { | |
5362 | spin_lock(&poll->head->lock); | |
5363 | if (unlikely(list_empty(&poll->wait.entry))) { | |
5364 | if (ipt->error) | |
5365 | cancel = true; | |
5366 | ipt->error = 0; | |
5367 | mask = 0; | |
5368 | } | |
5369 | if (mask || ipt->error) | |
5370 | list_del_init(&poll->wait.entry); | |
5371 | else if (cancel) | |
5372 | WRITE_ONCE(poll->canceled, true); | |
5373 | else if (!poll->done) /* actually waiting for an event */ | |
5374 | io_poll_req_insert(req); | |
5375 | spin_unlock(&poll->head->lock); | |
5376 | } | |
5377 | ||
5378 | return mask; | |
5379 | } | |
5380 | ||
5381 | static bool io_arm_poll_handler(struct io_kiocb *req) | |
5382 | { | |
5383 | const struct io_op_def *def = &io_op_defs[req->opcode]; | |
5384 | struct io_ring_ctx *ctx = req->ctx; | |
5385 | struct async_poll *apoll; | |
5386 | struct io_poll_table ipt; | |
5387 | __poll_t mask, ret; | |
9dab14b8 | 5388 | int rw; |
d7718a9d JA |
5389 | |
5390 | if (!req->file || !file_can_poll(req->file)) | |
5391 | return false; | |
24c74678 | 5392 | if (req->flags & REQ_F_POLLED) |
d7718a9d | 5393 | return false; |
9dab14b8 JA |
5394 | if (def->pollin) |
5395 | rw = READ; | |
5396 | else if (def->pollout) | |
5397 | rw = WRITE; | |
5398 | else | |
5399 | return false; | |
5400 | /* if we can't nonblock try, then no point in arming a poll handler */ | |
5401 | if (!io_file_supports_async(req->file, rw)) | |
d7718a9d JA |
5402 | return false; |
5403 | ||
5404 | apoll = kmalloc(sizeof(*apoll), GFP_ATOMIC); | |
5405 | if (unlikely(!apoll)) | |
5406 | return false; | |
807abcb0 | 5407 | apoll->double_poll = NULL; |
d7718a9d JA |
5408 | |
5409 | req->flags |= REQ_F_POLLED; | |
d7718a9d | 5410 | req->apoll = apoll; |
d7718a9d | 5411 | |
8755d97a | 5412 | mask = 0; |
d7718a9d | 5413 | if (def->pollin) |
8755d97a | 5414 | mask |= POLLIN | POLLRDNORM; |
d7718a9d JA |
5415 | if (def->pollout) |
5416 | mask |= POLLOUT | POLLWRNORM; | |
901341bb LH |
5417 | |
5418 | /* If reading from MSG_ERRQUEUE using recvmsg, ignore POLLIN */ | |
5419 | if ((req->opcode == IORING_OP_RECVMSG) && | |
5420 | (req->sr_msg.msg_flags & MSG_ERRQUEUE)) | |
5421 | mask &= ~POLLIN; | |
5422 | ||
d7718a9d JA |
5423 | mask |= POLLERR | POLLPRI; |
5424 | ||
5425 | ipt.pt._qproc = io_async_queue_proc; | |
5426 | ||
5427 | ret = __io_arm_poll_handler(req, &apoll->poll, &ipt, mask, | |
5428 | io_async_wake); | |
a36da65c | 5429 | if (ret || ipt.error) { |
d4e7cd36 | 5430 | io_poll_remove_double(req); |
d7718a9d | 5431 | spin_unlock_irq(&ctx->completion_lock); |
807abcb0 | 5432 | kfree(apoll->double_poll); |
d7718a9d JA |
5433 | kfree(apoll); |
5434 | return false; | |
5435 | } | |
5436 | spin_unlock_irq(&ctx->completion_lock); | |
5437 | trace_io_uring_poll_arm(ctx, req->opcode, req->user_data, mask, | |
5438 | apoll->poll.events); | |
5439 | return true; | |
5440 | } | |
5441 | ||
5442 | static bool __io_poll_remove_one(struct io_kiocb *req, | |
5443 | struct io_poll_iocb *poll) | |
221c5eb2 | 5444 | { |
b41e9852 | 5445 | bool do_complete = false; |
221c5eb2 JA |
5446 | |
5447 | spin_lock(&poll->head->lock); | |
5448 | WRITE_ONCE(poll->canceled, true); | |
392edb45 JA |
5449 | if (!list_empty(&poll->wait.entry)) { |
5450 | list_del_init(&poll->wait.entry); | |
b41e9852 | 5451 | do_complete = true; |
221c5eb2 JA |
5452 | } |
5453 | spin_unlock(&poll->head->lock); | |
3bfa5bcb | 5454 | hash_del(&req->hash_node); |
d7718a9d JA |
5455 | return do_complete; |
5456 | } | |
5457 | ||
5458 | static bool io_poll_remove_one(struct io_kiocb *req) | |
5459 | { | |
5460 | bool do_complete; | |
5461 | ||
d4e7cd36 JA |
5462 | io_poll_remove_double(req); |
5463 | ||
d7718a9d JA |
5464 | if (req->opcode == IORING_OP_POLL_ADD) { |
5465 | do_complete = __io_poll_remove_one(req, &req->poll); | |
5466 | } else { | |
3bfa5bcb JA |
5467 | struct async_poll *apoll = req->apoll; |
5468 | ||
d7718a9d | 5469 | /* non-poll requests have submit ref still */ |
3bfa5bcb JA |
5470 | do_complete = __io_poll_remove_one(req, &apoll->poll); |
5471 | if (do_complete) { | |
d7718a9d | 5472 | io_put_req(req); |
807abcb0 | 5473 | kfree(apoll->double_poll); |
3bfa5bcb JA |
5474 | kfree(apoll); |
5475 | } | |
b1f573bd XW |
5476 | } |
5477 | ||
b41e9852 JA |
5478 | if (do_complete) { |
5479 | io_cqring_fill_event(req, -ECANCELED); | |
5480 | io_commit_cqring(req->ctx); | |
f254ac04 | 5481 | req_set_fail_links(req); |
216578e5 | 5482 | io_put_req_deferred(req, 1); |
b41e9852 JA |
5483 | } |
5484 | ||
5485 | return do_complete; | |
221c5eb2 JA |
5486 | } |
5487 | ||
76e1b642 JA |
5488 | /* |
5489 | * Returns true if we found and killed one or more poll requests | |
5490 | */ | |
5491 | static bool io_poll_remove_all(struct io_ring_ctx *ctx, struct task_struct *tsk) | |
221c5eb2 | 5492 | { |
78076bb6 | 5493 | struct hlist_node *tmp; |
221c5eb2 | 5494 | struct io_kiocb *req; |
8e2e1faf | 5495 | int posted = 0, i; |
221c5eb2 JA |
5496 | |
5497 | spin_lock_irq(&ctx->completion_lock); | |
78076bb6 JA |
5498 | for (i = 0; i < (1U << ctx->cancel_hash_bits); i++) { |
5499 | struct hlist_head *list; | |
5500 | ||
5501 | list = &ctx->cancel_hash[i]; | |
f3606e3a JA |
5502 | hlist_for_each_entry_safe(req, tmp, list, hash_node) { |
5503 | if (io_task_match(req, tsk)) | |
5504 | posted += io_poll_remove_one(req); | |
5505 | } | |
221c5eb2 JA |
5506 | } |
5507 | spin_unlock_irq(&ctx->completion_lock); | |
b41e9852 | 5508 | |
8e2e1faf JA |
5509 | if (posted) |
5510 | io_cqring_ev_posted(ctx); | |
76e1b642 JA |
5511 | |
5512 | return posted != 0; | |
221c5eb2 JA |
5513 | } |
5514 | ||
47f46768 JA |
5515 | static int io_poll_cancel(struct io_ring_ctx *ctx, __u64 sqe_addr) |
5516 | { | |
78076bb6 | 5517 | struct hlist_head *list; |
47f46768 JA |
5518 | struct io_kiocb *req; |
5519 | ||
78076bb6 JA |
5520 | list = &ctx->cancel_hash[hash_long(sqe_addr, ctx->cancel_hash_bits)]; |
5521 | hlist_for_each_entry(req, list, hash_node) { | |
b41e9852 JA |
5522 | if (sqe_addr != req->user_data) |
5523 | continue; | |
5524 | if (io_poll_remove_one(req)) | |
eac406c6 | 5525 | return 0; |
b41e9852 | 5526 | return -EALREADY; |
47f46768 JA |
5527 | } |
5528 | ||
5529 | return -ENOENT; | |
5530 | } | |
5531 | ||
3529d8c2 JA |
5532 | static int io_poll_remove_prep(struct io_kiocb *req, |
5533 | const struct io_uring_sqe *sqe) | |
0969e783 | 5534 | { |
0969e783 JA |
5535 | if (unlikely(req->ctx->flags & IORING_SETUP_IOPOLL)) |
5536 | return -EINVAL; | |
5537 | if (sqe->ioprio || sqe->off || sqe->len || sqe->buf_index || | |
5538 | sqe->poll_events) | |
5539 | return -EINVAL; | |
5540 | ||
5541 | req->poll.addr = READ_ONCE(sqe->addr); | |
0969e783 JA |
5542 | return 0; |
5543 | } | |
5544 | ||
221c5eb2 JA |
5545 | /* |
5546 | * Find a running poll command that matches one specified in sqe->addr, | |
5547 | * and remove it if found. | |
5548 | */ | |
fc4df999 | 5549 | static int io_poll_remove(struct io_kiocb *req) |
221c5eb2 JA |
5550 | { |
5551 | struct io_ring_ctx *ctx = req->ctx; | |
0969e783 | 5552 | u64 addr; |
47f46768 | 5553 | int ret; |
221c5eb2 | 5554 | |
0969e783 | 5555 | addr = req->poll.addr; |
221c5eb2 | 5556 | spin_lock_irq(&ctx->completion_lock); |
0969e783 | 5557 | ret = io_poll_cancel(ctx, addr); |
221c5eb2 JA |
5558 | spin_unlock_irq(&ctx->completion_lock); |
5559 | ||
4e88d6e7 JA |
5560 | if (ret < 0) |
5561 | req_set_fail_links(req); | |
e1e16097 | 5562 | io_req_complete(req, ret); |
221c5eb2 JA |
5563 | return 0; |
5564 | } | |
5565 | ||
221c5eb2 JA |
5566 | static int io_poll_wake(struct wait_queue_entry *wait, unsigned mode, int sync, |
5567 | void *key) | |
5568 | { | |
c2f2eb7d JA |
5569 | struct io_kiocb *req = wait->private; |
5570 | struct io_poll_iocb *poll = &req->poll; | |
221c5eb2 | 5571 | |
d7718a9d | 5572 | return __io_async_wake(req, poll, key_to_poll(key), io_poll_task_func); |
221c5eb2 JA |
5573 | } |
5574 | ||
221c5eb2 JA |
5575 | static void io_poll_queue_proc(struct file *file, struct wait_queue_head *head, |
5576 | struct poll_table_struct *p) | |
5577 | { | |
5578 | struct io_poll_table *pt = container_of(p, struct io_poll_table, pt); | |
5579 | ||
e8c2bc1f | 5580 | __io_queue_proc(&pt->req->poll, pt, head, (struct io_poll_iocb **) &pt->req->async_data); |
eac406c6 JA |
5581 | } |
5582 | ||
3529d8c2 | 5583 | static int io_poll_add_prep(struct io_kiocb *req, const struct io_uring_sqe *sqe) |
221c5eb2 JA |
5584 | { |
5585 | struct io_poll_iocb *poll = &req->poll; | |
5769a351 | 5586 | u32 events; |
221c5eb2 JA |
5587 | |
5588 | if (unlikely(req->ctx->flags & IORING_SETUP_IOPOLL)) | |
5589 | return -EINVAL; | |
5590 | if (sqe->addr || sqe->ioprio || sqe->off || sqe->len || sqe->buf_index) | |
5591 | return -EINVAL; | |
5592 | ||
5769a351 JX |
5593 | events = READ_ONCE(sqe->poll32_events); |
5594 | #ifdef __BIG_ENDIAN | |
5595 | events = swahw32(events); | |
5596 | #endif | |
a31eb4a2 JX |
5597 | poll->events = demangle_poll(events) | EPOLLERR | EPOLLHUP | |
5598 | (events & EPOLLEXCLUSIVE); | |
0969e783 JA |
5599 | return 0; |
5600 | } | |
5601 | ||
014db007 | 5602 | static int io_poll_add(struct io_kiocb *req) |
0969e783 JA |
5603 | { |
5604 | struct io_poll_iocb *poll = &req->poll; | |
5605 | struct io_ring_ctx *ctx = req->ctx; | |
5606 | struct io_poll_table ipt; | |
0969e783 | 5607 | __poll_t mask; |
0969e783 | 5608 | |
d7718a9d | 5609 | ipt.pt._qproc = io_poll_queue_proc; |
36703247 | 5610 | |
d7718a9d JA |
5611 | mask = __io_arm_poll_handler(req, &req->poll, &ipt, poll->events, |
5612 | io_poll_wake); | |
221c5eb2 | 5613 | |
8c838788 | 5614 | if (mask) { /* no async, we'd stolen it */ |
221c5eb2 | 5615 | ipt.error = 0; |
b0dd8a41 | 5616 | io_poll_complete(req, mask, 0); |
221c5eb2 | 5617 | } |
221c5eb2 JA |
5618 | spin_unlock_irq(&ctx->completion_lock); |
5619 | ||
8c838788 JA |
5620 | if (mask) { |
5621 | io_cqring_ev_posted(ctx); | |
014db007 | 5622 | io_put_req(req); |
221c5eb2 | 5623 | } |
8c838788 | 5624 | return ipt.error; |
221c5eb2 JA |
5625 | } |
5626 | ||
5262f567 JA |
5627 | static enum hrtimer_restart io_timeout_fn(struct hrtimer *timer) |
5628 | { | |
ad8a48ac JA |
5629 | struct io_timeout_data *data = container_of(timer, |
5630 | struct io_timeout_data, timer); | |
5631 | struct io_kiocb *req = data->req; | |
5632 | struct io_ring_ctx *ctx = req->ctx; | |
5262f567 JA |
5633 | unsigned long flags; |
5634 | ||
5262f567 | 5635 | spin_lock_irqsave(&ctx->completion_lock, flags); |
a71976f3 | 5636 | list_del_init(&req->timeout.list); |
01cec8c1 PB |
5637 | atomic_set(&req->ctx->cq_timeouts, |
5638 | atomic_read(&req->ctx->cq_timeouts) + 1); | |
5639 | ||
78e19bbe | 5640 | io_cqring_fill_event(req, -ETIME); |
5262f567 JA |
5641 | io_commit_cqring(ctx); |
5642 | spin_unlock_irqrestore(&ctx->completion_lock, flags); | |
5643 | ||
5644 | io_cqring_ev_posted(ctx); | |
4e88d6e7 | 5645 | req_set_fail_links(req); |
5262f567 JA |
5646 | io_put_req(req); |
5647 | return HRTIMER_NORESTART; | |
5648 | } | |
5649 | ||
f254ac04 JA |
5650 | static int __io_timeout_cancel(struct io_kiocb *req) |
5651 | { | |
e8c2bc1f | 5652 | struct io_timeout_data *io = req->async_data; |
f254ac04 JA |
5653 | int ret; |
5654 | ||
e8c2bc1f | 5655 | ret = hrtimer_try_to_cancel(&io->timer); |
f254ac04 JA |
5656 | if (ret == -1) |
5657 | return -EALREADY; | |
a71976f3 | 5658 | list_del_init(&req->timeout.list); |
f254ac04 JA |
5659 | |
5660 | req_set_fail_links(req); | |
f254ac04 | 5661 | io_cqring_fill_event(req, -ECANCELED); |
216578e5 | 5662 | io_put_req_deferred(req, 1); |
f254ac04 JA |
5663 | return 0; |
5664 | } | |
5665 | ||
47f46768 JA |
5666 | static int io_timeout_cancel(struct io_ring_ctx *ctx, __u64 user_data) |
5667 | { | |
5668 | struct io_kiocb *req; | |
5669 | int ret = -ENOENT; | |
5670 | ||
135fcde8 | 5671 | list_for_each_entry(req, &ctx->timeout_list, timeout.list) { |
47f46768 | 5672 | if (user_data == req->user_data) { |
47f46768 JA |
5673 | ret = 0; |
5674 | break; | |
5675 | } | |
5676 | } | |
5677 | ||
5678 | if (ret == -ENOENT) | |
5679 | return ret; | |
5680 | ||
f254ac04 | 5681 | return __io_timeout_cancel(req); |
47f46768 JA |
5682 | } |
5683 | ||
3529d8c2 JA |
5684 | static int io_timeout_remove_prep(struct io_kiocb *req, |
5685 | const struct io_uring_sqe *sqe) | |
b29472ee | 5686 | { |
b29472ee JA |
5687 | if (unlikely(req->ctx->flags & IORING_SETUP_IOPOLL)) |
5688 | return -EINVAL; | |
61710e43 DA |
5689 | if (unlikely(req->flags & (REQ_F_FIXED_FILE | REQ_F_BUFFER_SELECT))) |
5690 | return -EINVAL; | |
0bdf7a2d | 5691 | if (sqe->ioprio || sqe->buf_index || sqe->len || sqe->timeout_flags) |
b29472ee JA |
5692 | return -EINVAL; |
5693 | ||
0bdf7a2d | 5694 | req->timeout_rem.addr = READ_ONCE(sqe->addr); |
b29472ee JA |
5695 | return 0; |
5696 | } | |
5697 | ||
11365043 JA |
5698 | /* |
5699 | * Remove or update an existing timeout command | |
5700 | */ | |
fc4df999 | 5701 | static int io_timeout_remove(struct io_kiocb *req) |
11365043 JA |
5702 | { |
5703 | struct io_ring_ctx *ctx = req->ctx; | |
47f46768 | 5704 | int ret; |
11365043 | 5705 | |
11365043 | 5706 | spin_lock_irq(&ctx->completion_lock); |
0bdf7a2d | 5707 | ret = io_timeout_cancel(ctx, req->timeout_rem.addr); |
11365043 | 5708 | |
47f46768 | 5709 | io_cqring_fill_event(req, ret); |
11365043 JA |
5710 | io_commit_cqring(ctx); |
5711 | spin_unlock_irq(&ctx->completion_lock); | |
5262f567 | 5712 | io_cqring_ev_posted(ctx); |
4e88d6e7 JA |
5713 | if (ret < 0) |
5714 | req_set_fail_links(req); | |
ec9c02ad | 5715 | io_put_req(req); |
11365043 | 5716 | return 0; |
5262f567 JA |
5717 | } |
5718 | ||
3529d8c2 | 5719 | static int io_timeout_prep(struct io_kiocb *req, const struct io_uring_sqe *sqe, |
2d28390a | 5720 | bool is_timeout_link) |
5262f567 | 5721 | { |
ad8a48ac | 5722 | struct io_timeout_data *data; |
a41525ab | 5723 | unsigned flags; |
56080b02 | 5724 | u32 off = READ_ONCE(sqe->off); |
5262f567 | 5725 | |
ad8a48ac | 5726 | if (unlikely(req->ctx->flags & IORING_SETUP_IOPOLL)) |
5262f567 | 5727 | return -EINVAL; |
ad8a48ac | 5728 | if (sqe->ioprio || sqe->buf_index || sqe->len != 1) |
a41525ab | 5729 | return -EINVAL; |
56080b02 | 5730 | if (off && is_timeout_link) |
2d28390a | 5731 | return -EINVAL; |
a41525ab JA |
5732 | flags = READ_ONCE(sqe->timeout_flags); |
5733 | if (flags & ~IORING_TIMEOUT_ABS) | |
5262f567 | 5734 | return -EINVAL; |
bdf20073 | 5735 | |
bfe68a22 | 5736 | req->timeout.off = off; |
26a61679 | 5737 | |
e8c2bc1f | 5738 | if (!req->async_data && io_alloc_async_data(req)) |
26a61679 JA |
5739 | return -ENOMEM; |
5740 | ||
e8c2bc1f | 5741 | data = req->async_data; |
ad8a48ac | 5742 | data->req = req; |
ad8a48ac JA |
5743 | |
5744 | if (get_timespec64(&data->ts, u64_to_user_ptr(sqe->addr))) | |
5262f567 JA |
5745 | return -EFAULT; |
5746 | ||
11365043 | 5747 | if (flags & IORING_TIMEOUT_ABS) |
ad8a48ac | 5748 | data->mode = HRTIMER_MODE_ABS; |
11365043 | 5749 | else |
ad8a48ac | 5750 | data->mode = HRTIMER_MODE_REL; |
11365043 | 5751 | |
ad8a48ac JA |
5752 | hrtimer_init(&data->timer, CLOCK_MONOTONIC, data->mode); |
5753 | return 0; | |
5754 | } | |
5755 | ||
fc4df999 | 5756 | static int io_timeout(struct io_kiocb *req) |
ad8a48ac | 5757 | { |
ad8a48ac | 5758 | struct io_ring_ctx *ctx = req->ctx; |
e8c2bc1f | 5759 | struct io_timeout_data *data = req->async_data; |
ad8a48ac | 5760 | struct list_head *entry; |
bfe68a22 | 5761 | u32 tail, off = req->timeout.off; |
ad8a48ac | 5762 | |
733f5c95 | 5763 | spin_lock_irq(&ctx->completion_lock); |
93bd25bb | 5764 | |
5262f567 JA |
5765 | /* |
5766 | * sqe->off holds how many events that need to occur for this | |
93bd25bb JA |
5767 | * timeout event to be satisfied. If it isn't set, then this is |
5768 | * a pure timeout request, sequence isn't used. | |
5262f567 | 5769 | */ |
8eb7e2d0 | 5770 | if (io_is_timeout_noseq(req)) { |
93bd25bb JA |
5771 | entry = ctx->timeout_list.prev; |
5772 | goto add; | |
5773 | } | |
5262f567 | 5774 | |
bfe68a22 PB |
5775 | tail = ctx->cached_cq_tail - atomic_read(&ctx->cq_timeouts); |
5776 | req->timeout.target_seq = tail + off; | |
5262f567 JA |
5777 | |
5778 | /* | |
5779 | * Insertion sort, ensuring the first entry in the list is always | |
5780 | * the one we need first. | |
5781 | */ | |
5262f567 | 5782 | list_for_each_prev(entry, &ctx->timeout_list) { |
135fcde8 PB |
5783 | struct io_kiocb *nxt = list_entry(entry, struct io_kiocb, |
5784 | timeout.list); | |
5262f567 | 5785 | |
8eb7e2d0 | 5786 | if (io_is_timeout_noseq(nxt)) |
93bd25bb | 5787 | continue; |
bfe68a22 PB |
5788 | /* nxt.seq is behind @tail, otherwise would've been completed */ |
5789 | if (off >= nxt->timeout.target_seq - tail) | |
5262f567 JA |
5790 | break; |
5791 | } | |
93bd25bb | 5792 | add: |
135fcde8 | 5793 | list_add(&req->timeout.list, entry); |
ad8a48ac JA |
5794 | data->timer.function = io_timeout_fn; |
5795 | hrtimer_start(&data->timer, timespec64_to_ktime(data->ts), data->mode); | |
5262f567 | 5796 | spin_unlock_irq(&ctx->completion_lock); |
5262f567 JA |
5797 | return 0; |
5798 | } | |
5262f567 | 5799 | |
62755e35 JA |
5800 | static bool io_cancel_cb(struct io_wq_work *work, void *data) |
5801 | { | |
5802 | struct io_kiocb *req = container_of(work, struct io_kiocb, work); | |
5803 | ||
5804 | return req->user_data == (unsigned long) data; | |
5805 | } | |
5806 | ||
e977d6d3 | 5807 | static int io_async_cancel_one(struct io_ring_ctx *ctx, void *sqe_addr) |
62755e35 | 5808 | { |
62755e35 | 5809 | enum io_wq_cancel cancel_ret; |
62755e35 JA |
5810 | int ret = 0; |
5811 | ||
4f26bda1 | 5812 | cancel_ret = io_wq_cancel_cb(ctx->io_wq, io_cancel_cb, sqe_addr, false); |
62755e35 JA |
5813 | switch (cancel_ret) { |
5814 | case IO_WQ_CANCEL_OK: | |
5815 | ret = 0; | |
5816 | break; | |
5817 | case IO_WQ_CANCEL_RUNNING: | |
5818 | ret = -EALREADY; | |
5819 | break; | |
5820 | case IO_WQ_CANCEL_NOTFOUND: | |
5821 | ret = -ENOENT; | |
5822 | break; | |
5823 | } | |
5824 | ||
e977d6d3 JA |
5825 | return ret; |
5826 | } | |
5827 | ||
47f46768 JA |
5828 | static void io_async_find_and_cancel(struct io_ring_ctx *ctx, |
5829 | struct io_kiocb *req, __u64 sqe_addr, | |
014db007 | 5830 | int success_ret) |
47f46768 JA |
5831 | { |
5832 | unsigned long flags; | |
5833 | int ret; | |
5834 | ||
5835 | ret = io_async_cancel_one(ctx, (void *) (unsigned long) sqe_addr); | |
5836 | if (ret != -ENOENT) { | |
5837 | spin_lock_irqsave(&ctx->completion_lock, flags); | |
5838 | goto done; | |
5839 | } | |
5840 | ||
5841 | spin_lock_irqsave(&ctx->completion_lock, flags); | |
5842 | ret = io_timeout_cancel(ctx, sqe_addr); | |
5843 | if (ret != -ENOENT) | |
5844 | goto done; | |
5845 | ret = io_poll_cancel(ctx, sqe_addr); | |
5846 | done: | |
b0dd8a41 JA |
5847 | if (!ret) |
5848 | ret = success_ret; | |
47f46768 JA |
5849 | io_cqring_fill_event(req, ret); |
5850 | io_commit_cqring(ctx); | |
5851 | spin_unlock_irqrestore(&ctx->completion_lock, flags); | |
5852 | io_cqring_ev_posted(ctx); | |
5853 | ||
4e88d6e7 JA |
5854 | if (ret < 0) |
5855 | req_set_fail_links(req); | |
014db007 | 5856 | io_put_req(req); |
47f46768 JA |
5857 | } |
5858 | ||
3529d8c2 JA |
5859 | static int io_async_cancel_prep(struct io_kiocb *req, |
5860 | const struct io_uring_sqe *sqe) | |
e977d6d3 | 5861 | { |
fbf23849 | 5862 | if (unlikely(req->ctx->flags & IORING_SETUP_IOPOLL)) |
e977d6d3 | 5863 | return -EINVAL; |
61710e43 DA |
5864 | if (unlikely(req->flags & (REQ_F_FIXED_FILE | REQ_F_BUFFER_SELECT))) |
5865 | return -EINVAL; | |
5866 | if (sqe->ioprio || sqe->off || sqe->len || sqe->cancel_flags) | |
e977d6d3 JA |
5867 | return -EINVAL; |
5868 | ||
fbf23849 JA |
5869 | req->cancel.addr = READ_ONCE(sqe->addr); |
5870 | return 0; | |
5871 | } | |
5872 | ||
014db007 | 5873 | static int io_async_cancel(struct io_kiocb *req) |
fbf23849 JA |
5874 | { |
5875 | struct io_ring_ctx *ctx = req->ctx; | |
fbf23849 | 5876 | |
014db007 | 5877 | io_async_find_and_cancel(ctx, req, req->cancel.addr, 0); |
5262f567 JA |
5878 | return 0; |
5879 | } | |
5880 | ||
05f3fb3c JA |
5881 | static int io_files_update_prep(struct io_kiocb *req, |
5882 | const struct io_uring_sqe *sqe) | |
5883 | { | |
6ca56f84 JA |
5884 | if (unlikely(req->ctx->flags & IORING_SETUP_SQPOLL)) |
5885 | return -EINVAL; | |
61710e43 DA |
5886 | if (unlikely(req->flags & (REQ_F_FIXED_FILE | REQ_F_BUFFER_SELECT))) |
5887 | return -EINVAL; | |
5888 | if (sqe->ioprio || sqe->rw_flags) | |
05f3fb3c JA |
5889 | return -EINVAL; |
5890 | ||
5891 | req->files_update.offset = READ_ONCE(sqe->off); | |
5892 | req->files_update.nr_args = READ_ONCE(sqe->len); | |
5893 | if (!req->files_update.nr_args) | |
5894 | return -EINVAL; | |
5895 | req->files_update.arg = READ_ONCE(sqe->addr); | |
5896 | return 0; | |
5897 | } | |
5898 | ||
229a7b63 JA |
5899 | static int io_files_update(struct io_kiocb *req, bool force_nonblock, |
5900 | struct io_comp_state *cs) | |
fbf23849 JA |
5901 | { |
5902 | struct io_ring_ctx *ctx = req->ctx; | |
05f3fb3c JA |
5903 | struct io_uring_files_update up; |
5904 | int ret; | |
fbf23849 | 5905 | |
f86cd20c | 5906 | if (force_nonblock) |
05f3fb3c | 5907 | return -EAGAIN; |
05f3fb3c JA |
5908 | |
5909 | up.offset = req->files_update.offset; | |
5910 | up.fds = req->files_update.arg; | |
5911 | ||
5912 | mutex_lock(&ctx->uring_lock); | |
5913 | ret = __io_sqe_files_update(ctx, &up, req->files_update.nr_args); | |
5914 | mutex_unlock(&ctx->uring_lock); | |
5915 | ||
5916 | if (ret < 0) | |
5917 | req_set_fail_links(req); | |
229a7b63 | 5918 | __io_req_complete(req, ret, 0, cs); |
5262f567 JA |
5919 | return 0; |
5920 | } | |
5921 | ||
bfe76559 | 5922 | static int io_req_prep(struct io_kiocb *req, const struct io_uring_sqe *sqe) |
f67676d1 | 5923 | { |
d625c6ee | 5924 | switch (req->opcode) { |
e781573e | 5925 | case IORING_OP_NOP: |
bfe76559 | 5926 | return 0; |
f67676d1 JA |
5927 | case IORING_OP_READV: |
5928 | case IORING_OP_READ_FIXED: | |
3a6820f2 | 5929 | case IORING_OP_READ: |
bfe76559 | 5930 | return io_read_prep(req, sqe); |
f67676d1 JA |
5931 | case IORING_OP_WRITEV: |
5932 | case IORING_OP_WRITE_FIXED: | |
3a6820f2 | 5933 | case IORING_OP_WRITE: |
bfe76559 | 5934 | return io_write_prep(req, sqe); |
0969e783 | 5935 | case IORING_OP_POLL_ADD: |
bfe76559 | 5936 | return io_poll_add_prep(req, sqe); |
0969e783 | 5937 | case IORING_OP_POLL_REMOVE: |
bfe76559 | 5938 | return io_poll_remove_prep(req, sqe); |
8ed8d3c3 | 5939 | case IORING_OP_FSYNC: |
bfe76559 | 5940 | return io_prep_fsync(req, sqe); |
8ed8d3c3 | 5941 | case IORING_OP_SYNC_FILE_RANGE: |
bfe76559 | 5942 | return io_prep_sfr(req, sqe); |
03b1230c | 5943 | case IORING_OP_SENDMSG: |
fddaface | 5944 | case IORING_OP_SEND: |
bfe76559 | 5945 | return io_sendmsg_prep(req, sqe); |
03b1230c | 5946 | case IORING_OP_RECVMSG: |
fddaface | 5947 | case IORING_OP_RECV: |
bfe76559 | 5948 | return io_recvmsg_prep(req, sqe); |
f499a021 | 5949 | case IORING_OP_CONNECT: |
bfe76559 | 5950 | return io_connect_prep(req, sqe); |
2d28390a | 5951 | case IORING_OP_TIMEOUT: |
bfe76559 | 5952 | return io_timeout_prep(req, sqe, false); |
b29472ee | 5953 | case IORING_OP_TIMEOUT_REMOVE: |
bfe76559 | 5954 | return io_timeout_remove_prep(req, sqe); |
fbf23849 | 5955 | case IORING_OP_ASYNC_CANCEL: |
bfe76559 | 5956 | return io_async_cancel_prep(req, sqe); |
2d28390a | 5957 | case IORING_OP_LINK_TIMEOUT: |
bfe76559 | 5958 | return io_timeout_prep(req, sqe, true); |
8ed8d3c3 | 5959 | case IORING_OP_ACCEPT: |
bfe76559 | 5960 | return io_accept_prep(req, sqe); |
d63d1b5e | 5961 | case IORING_OP_FALLOCATE: |
bfe76559 | 5962 | return io_fallocate_prep(req, sqe); |
15b71abe | 5963 | case IORING_OP_OPENAT: |
bfe76559 | 5964 | return io_openat_prep(req, sqe); |
b5dba59e | 5965 | case IORING_OP_CLOSE: |
bfe76559 | 5966 | return io_close_prep(req, sqe); |
05f3fb3c | 5967 | case IORING_OP_FILES_UPDATE: |
bfe76559 | 5968 | return io_files_update_prep(req, sqe); |
eddc7ef5 | 5969 | case IORING_OP_STATX: |
bfe76559 | 5970 | return io_statx_prep(req, sqe); |
4840e418 | 5971 | case IORING_OP_FADVISE: |
bfe76559 | 5972 | return io_fadvise_prep(req, sqe); |
c1ca757b | 5973 | case IORING_OP_MADVISE: |
bfe76559 | 5974 | return io_madvise_prep(req, sqe); |
cebdb986 | 5975 | case IORING_OP_OPENAT2: |
bfe76559 | 5976 | return io_openat2_prep(req, sqe); |
3e4827b0 | 5977 | case IORING_OP_EPOLL_CTL: |
bfe76559 | 5978 | return io_epoll_ctl_prep(req, sqe); |
7d67af2c | 5979 | case IORING_OP_SPLICE: |
bfe76559 | 5980 | return io_splice_prep(req, sqe); |
ddf0322d | 5981 | case IORING_OP_PROVIDE_BUFFERS: |
bfe76559 | 5982 | return io_provide_buffers_prep(req, sqe); |
067524e9 | 5983 | case IORING_OP_REMOVE_BUFFERS: |
bfe76559 | 5984 | return io_remove_buffers_prep(req, sqe); |
f2a8d5c7 | 5985 | case IORING_OP_TEE: |
bfe76559 | 5986 | return io_tee_prep(req, sqe); |
36f4fa68 JA |
5987 | case IORING_OP_SHUTDOWN: |
5988 | return io_shutdown_prep(req, sqe); | |
80a261fd JA |
5989 | case IORING_OP_RENAMEAT: |
5990 | return io_renameat_prep(req, sqe); | |
14a1143b JA |
5991 | case IORING_OP_UNLINKAT: |
5992 | return io_unlinkat_prep(req, sqe); | |
f67676d1 JA |
5993 | } |
5994 | ||
bfe76559 PB |
5995 | printk_once(KERN_WARNING "io_uring: unhandled opcode %d\n", |
5996 | req->opcode); | |
5997 | return-EINVAL; | |
5998 | } | |
5999 | ||
6000 | static int io_req_defer_prep(struct io_kiocb *req, | |
6001 | const struct io_uring_sqe *sqe) | |
6002 | { | |
bfe76559 PB |
6003 | if (!sqe) |
6004 | return 0; | |
6005 | if (io_alloc_async_data(req)) | |
6006 | return -EAGAIN; | |
bfe76559 | 6007 | return io_req_prep(req, sqe); |
f67676d1 JA |
6008 | } |
6009 | ||
9cf7c104 PB |
6010 | static u32 io_get_sequence(struct io_kiocb *req) |
6011 | { | |
6012 | struct io_kiocb *pos; | |
6013 | struct io_ring_ctx *ctx = req->ctx; | |
6014 | u32 total_submitted, nr_reqs = 1; | |
6015 | ||
6016 | if (req->flags & REQ_F_LINK_HEAD) | |
6017 | list_for_each_entry(pos, &req->link_list, link_list) | |
6018 | nr_reqs++; | |
6019 | ||
6020 | total_submitted = ctx->cached_sq_head - ctx->cached_sq_dropped; | |
6021 | return total_submitted - nr_reqs; | |
6022 | } | |
6023 | ||
3529d8c2 | 6024 | static int io_req_defer(struct io_kiocb *req, const struct io_uring_sqe *sqe) |
de0617e4 | 6025 | { |
a197f664 | 6026 | struct io_ring_ctx *ctx = req->ctx; |
27dc8338 | 6027 | struct io_defer_entry *de; |
f67676d1 | 6028 | int ret; |
9cf7c104 | 6029 | u32 seq; |
de0617e4 | 6030 | |
9d858b21 | 6031 | /* Still need defer if there is pending req in defer list. */ |
9cf7c104 PB |
6032 | if (likely(list_empty_careful(&ctx->defer_list) && |
6033 | !(req->flags & REQ_F_IO_DRAIN))) | |
6034 | return 0; | |
6035 | ||
6036 | seq = io_get_sequence(req); | |
6037 | /* Still a chance to pass the sequence check */ | |
6038 | if (!req_need_defer(req, seq) && list_empty_careful(&ctx->defer_list)) | |
de0617e4 JA |
6039 | return 0; |
6040 | ||
e8c2bc1f | 6041 | if (!req->async_data) { |
650b5481 | 6042 | ret = io_req_defer_prep(req, sqe); |
327d6d96 | 6043 | if (ret) |
650b5481 PB |
6044 | return ret; |
6045 | } | |
cbdcb435 | 6046 | io_prep_async_link(req); |
27dc8338 PB |
6047 | de = kmalloc(sizeof(*de), GFP_KERNEL); |
6048 | if (!de) | |
6049 | return -ENOMEM; | |
2d28390a | 6050 | |
de0617e4 | 6051 | spin_lock_irq(&ctx->completion_lock); |
9cf7c104 | 6052 | if (!req_need_defer(req, seq) && list_empty(&ctx->defer_list)) { |
de0617e4 | 6053 | spin_unlock_irq(&ctx->completion_lock); |
27dc8338 | 6054 | kfree(de); |
ae34817b PB |
6055 | io_queue_async_work(req); |
6056 | return -EIOCBQUEUED; | |
de0617e4 JA |
6057 | } |
6058 | ||
915967f6 | 6059 | trace_io_uring_defer(ctx, req, req->user_data); |
27dc8338 | 6060 | de->req = req; |
9cf7c104 | 6061 | de->seq = seq; |
27dc8338 | 6062 | list_add_tail(&de->list, &ctx->defer_list); |
de0617e4 JA |
6063 | spin_unlock_irq(&ctx->completion_lock); |
6064 | return -EIOCBQUEUED; | |
6065 | } | |
6066 | ||
f573d384 | 6067 | static void io_req_drop_files(struct io_kiocb *req) |
99bc4c38 | 6068 | { |
f573d384 JA |
6069 | struct io_ring_ctx *ctx = req->ctx; |
6070 | unsigned long flags; | |
6071 | ||
6072 | spin_lock_irqsave(&ctx->inflight_lock, flags); | |
6073 | list_del(&req->inflight_entry); | |
6074 | if (waitqueue_active(&ctx->inflight_wait)) | |
6075 | wake_up(&ctx->inflight_wait); | |
6076 | spin_unlock_irqrestore(&ctx->inflight_lock, flags); | |
6077 | req->flags &= ~REQ_F_INFLIGHT; | |
98447d65 JA |
6078 | put_files_struct(req->work.identity->files); |
6079 | put_nsproxy(req->work.identity->nsproxy); | |
dfead8a8 | 6080 | req->work.flags &= ~IO_WQ_WORK_FILES; |
f573d384 | 6081 | } |
99bc4c38 | 6082 | |
3ca405eb | 6083 | static void __io_clean_op(struct io_kiocb *req) |
99bc4c38 | 6084 | { |
0e1b6fe3 PB |
6085 | if (req->flags & REQ_F_BUFFER_SELECTED) { |
6086 | switch (req->opcode) { | |
6087 | case IORING_OP_READV: | |
6088 | case IORING_OP_READ_FIXED: | |
6089 | case IORING_OP_READ: | |
bcda7baa | 6090 | kfree((void *)(unsigned long)req->rw.addr); |
0e1b6fe3 PB |
6091 | break; |
6092 | case IORING_OP_RECVMSG: | |
6093 | case IORING_OP_RECV: | |
bcda7baa | 6094 | kfree(req->sr_msg.kbuf); |
0e1b6fe3 PB |
6095 | break; |
6096 | } | |
6097 | req->flags &= ~REQ_F_BUFFER_SELECTED; | |
99bc4c38 PB |
6098 | } |
6099 | ||
0e1b6fe3 PB |
6100 | if (req->flags & REQ_F_NEED_CLEANUP) { |
6101 | switch (req->opcode) { | |
6102 | case IORING_OP_READV: | |
6103 | case IORING_OP_READ_FIXED: | |
6104 | case IORING_OP_READ: | |
6105 | case IORING_OP_WRITEV: | |
6106 | case IORING_OP_WRITE_FIXED: | |
e8c2bc1f JA |
6107 | case IORING_OP_WRITE: { |
6108 | struct io_async_rw *io = req->async_data; | |
6109 | if (io->free_iovec) | |
6110 | kfree(io->free_iovec); | |
0e1b6fe3 | 6111 | break; |
e8c2bc1f | 6112 | } |
0e1b6fe3 | 6113 | case IORING_OP_RECVMSG: |
e8c2bc1f JA |
6114 | case IORING_OP_SENDMSG: { |
6115 | struct io_async_msghdr *io = req->async_data; | |
6116 | if (io->iov != io->fast_iov) | |
6117 | kfree(io->iov); | |
0e1b6fe3 | 6118 | break; |
e8c2bc1f | 6119 | } |
0e1b6fe3 PB |
6120 | case IORING_OP_SPLICE: |
6121 | case IORING_OP_TEE: | |
6122 | io_put_file(req, req->splice.file_in, | |
6123 | (req->splice.flags & SPLICE_F_FD_IN_FIXED)); | |
6124 | break; | |
f3cd4850 JA |
6125 | case IORING_OP_OPENAT: |
6126 | case IORING_OP_OPENAT2: | |
6127 | if (req->open.filename) | |
6128 | putname(req->open.filename); | |
6129 | break; | |
80a261fd JA |
6130 | case IORING_OP_RENAMEAT: |
6131 | putname(req->rename.oldpath); | |
6132 | putname(req->rename.newpath); | |
6133 | break; | |
14a1143b JA |
6134 | case IORING_OP_UNLINKAT: |
6135 | putname(req->unlink.filename); | |
6136 | break; | |
0e1b6fe3 PB |
6137 | } |
6138 | req->flags &= ~REQ_F_NEED_CLEANUP; | |
99bc4c38 | 6139 | } |
bb175342 | 6140 | |
f573d384 JA |
6141 | if (req->flags & REQ_F_INFLIGHT) |
6142 | io_req_drop_files(req); | |
99bc4c38 PB |
6143 | } |
6144 | ||
c1379e24 PB |
6145 | static int io_issue_sqe(struct io_kiocb *req, bool force_nonblock, |
6146 | struct io_comp_state *cs) | |
2b188cc1 | 6147 | { |
a197f664 | 6148 | struct io_ring_ctx *ctx = req->ctx; |
d625c6ee | 6149 | int ret; |
2b188cc1 | 6150 | |
d625c6ee | 6151 | switch (req->opcode) { |
2b188cc1 | 6152 | case IORING_OP_NOP: |
229a7b63 | 6153 | ret = io_nop(req, cs); |
2b188cc1 JA |
6154 | break; |
6155 | case IORING_OP_READV: | |
edafccee | 6156 | case IORING_OP_READ_FIXED: |
3a6820f2 | 6157 | case IORING_OP_READ: |
a1d7c393 | 6158 | ret = io_read(req, force_nonblock, cs); |
edafccee | 6159 | break; |
3529d8c2 | 6160 | case IORING_OP_WRITEV: |
edafccee | 6161 | case IORING_OP_WRITE_FIXED: |
3a6820f2 | 6162 | case IORING_OP_WRITE: |
a1d7c393 | 6163 | ret = io_write(req, force_nonblock, cs); |
2b188cc1 | 6164 | break; |
c992fe29 | 6165 | case IORING_OP_FSYNC: |
014db007 | 6166 | ret = io_fsync(req, force_nonblock); |
c992fe29 | 6167 | break; |
221c5eb2 | 6168 | case IORING_OP_POLL_ADD: |
014db007 | 6169 | ret = io_poll_add(req); |
221c5eb2 JA |
6170 | break; |
6171 | case IORING_OP_POLL_REMOVE: | |
fc4df999 | 6172 | ret = io_poll_remove(req); |
221c5eb2 | 6173 | break; |
5d17b4a4 | 6174 | case IORING_OP_SYNC_FILE_RANGE: |
014db007 | 6175 | ret = io_sync_file_range(req, force_nonblock); |
5d17b4a4 | 6176 | break; |
0fa03c62 | 6177 | case IORING_OP_SENDMSG: |
062d04d7 PB |
6178 | ret = io_sendmsg(req, force_nonblock, cs); |
6179 | break; | |
fddaface | 6180 | case IORING_OP_SEND: |
062d04d7 | 6181 | ret = io_send(req, force_nonblock, cs); |
0fa03c62 | 6182 | break; |
aa1fa28f | 6183 | case IORING_OP_RECVMSG: |
062d04d7 PB |
6184 | ret = io_recvmsg(req, force_nonblock, cs); |
6185 | break; | |
fddaface | 6186 | case IORING_OP_RECV: |
062d04d7 | 6187 | ret = io_recv(req, force_nonblock, cs); |
aa1fa28f | 6188 | break; |
5262f567 | 6189 | case IORING_OP_TIMEOUT: |
fc4df999 | 6190 | ret = io_timeout(req); |
5262f567 | 6191 | break; |
11365043 | 6192 | case IORING_OP_TIMEOUT_REMOVE: |
fc4df999 | 6193 | ret = io_timeout_remove(req); |
11365043 | 6194 | break; |
17f2fe35 | 6195 | case IORING_OP_ACCEPT: |
229a7b63 | 6196 | ret = io_accept(req, force_nonblock, cs); |
17f2fe35 | 6197 | break; |
f8e85cf2 | 6198 | case IORING_OP_CONNECT: |
229a7b63 | 6199 | ret = io_connect(req, force_nonblock, cs); |
f8e85cf2 | 6200 | break; |
62755e35 | 6201 | case IORING_OP_ASYNC_CANCEL: |
014db007 | 6202 | ret = io_async_cancel(req); |
62755e35 | 6203 | break; |
d63d1b5e | 6204 | case IORING_OP_FALLOCATE: |
014db007 | 6205 | ret = io_fallocate(req, force_nonblock); |
d63d1b5e | 6206 | break; |
15b71abe | 6207 | case IORING_OP_OPENAT: |
014db007 | 6208 | ret = io_openat(req, force_nonblock); |
15b71abe | 6209 | break; |
b5dba59e | 6210 | case IORING_OP_CLOSE: |
229a7b63 | 6211 | ret = io_close(req, force_nonblock, cs); |
b5dba59e | 6212 | break; |
05f3fb3c | 6213 | case IORING_OP_FILES_UPDATE: |
229a7b63 | 6214 | ret = io_files_update(req, force_nonblock, cs); |
05f3fb3c | 6215 | break; |
eddc7ef5 | 6216 | case IORING_OP_STATX: |
014db007 | 6217 | ret = io_statx(req, force_nonblock); |
eddc7ef5 | 6218 | break; |
4840e418 | 6219 | case IORING_OP_FADVISE: |
014db007 | 6220 | ret = io_fadvise(req, force_nonblock); |
4840e418 | 6221 | break; |
c1ca757b | 6222 | case IORING_OP_MADVISE: |
014db007 | 6223 | ret = io_madvise(req, force_nonblock); |
c1ca757b | 6224 | break; |
cebdb986 | 6225 | case IORING_OP_OPENAT2: |
014db007 | 6226 | ret = io_openat2(req, force_nonblock); |
cebdb986 | 6227 | break; |
3e4827b0 | 6228 | case IORING_OP_EPOLL_CTL: |
229a7b63 | 6229 | ret = io_epoll_ctl(req, force_nonblock, cs); |
3e4827b0 | 6230 | break; |
7d67af2c | 6231 | case IORING_OP_SPLICE: |
014db007 | 6232 | ret = io_splice(req, force_nonblock); |
7d67af2c | 6233 | break; |
ddf0322d | 6234 | case IORING_OP_PROVIDE_BUFFERS: |
229a7b63 | 6235 | ret = io_provide_buffers(req, force_nonblock, cs); |
ddf0322d | 6236 | break; |
067524e9 | 6237 | case IORING_OP_REMOVE_BUFFERS: |
229a7b63 | 6238 | ret = io_remove_buffers(req, force_nonblock, cs); |
3e4827b0 | 6239 | break; |
f2a8d5c7 | 6240 | case IORING_OP_TEE: |
f2a8d5c7 PB |
6241 | ret = io_tee(req, force_nonblock); |
6242 | break; | |
36f4fa68 JA |
6243 | case IORING_OP_SHUTDOWN: |
6244 | ret = io_shutdown(req, force_nonblock); | |
6245 | break; | |
80a261fd JA |
6246 | case IORING_OP_RENAMEAT: |
6247 | ret = io_renameat(req, force_nonblock); | |
6248 | break; | |
14a1143b JA |
6249 | case IORING_OP_UNLINKAT: |
6250 | ret = io_unlinkat(req, force_nonblock); | |
6251 | break; | |
2b188cc1 JA |
6252 | default: |
6253 | ret = -EINVAL; | |
6254 | break; | |
6255 | } | |
6256 | ||
def596e9 JA |
6257 | if (ret) |
6258 | return ret; | |
6259 | ||
b532576e JA |
6260 | /* If the op doesn't have a file, we're not polling for it */ |
6261 | if ((ctx->flags & IORING_SETUP_IOPOLL) && req->file) { | |
11ba820b JA |
6262 | const bool in_async = io_wq_current_is_worker(); |
6263 | ||
11ba820b JA |
6264 | /* workqueue context doesn't hold uring_lock, grab it now */ |
6265 | if (in_async) | |
6266 | mutex_lock(&ctx->uring_lock); | |
6267 | ||
def596e9 | 6268 | io_iopoll_req_issued(req); |
11ba820b JA |
6269 | |
6270 | if (in_async) | |
6271 | mutex_unlock(&ctx->uring_lock); | |
def596e9 JA |
6272 | } |
6273 | ||
6274 | return 0; | |
2b188cc1 JA |
6275 | } |
6276 | ||
f4db7182 | 6277 | static struct io_wq_work *io_wq_submit_work(struct io_wq_work *work) |
2b188cc1 JA |
6278 | { |
6279 | struct io_kiocb *req = container_of(work, struct io_kiocb, work); | |
6df1db6b | 6280 | struct io_kiocb *timeout; |
561fb04a | 6281 | int ret = 0; |
2b188cc1 | 6282 | |
6df1db6b PB |
6283 | timeout = io_prep_linked_timeout(req); |
6284 | if (timeout) | |
6285 | io_queue_linked_timeout(timeout); | |
d4c81f38 | 6286 | |
0c9d5ccd JA |
6287 | /* if NO_CANCEL is set, we must still run the work */ |
6288 | if ((work->flags & (IO_WQ_WORK_CANCEL|IO_WQ_WORK_NO_CANCEL)) == | |
6289 | IO_WQ_WORK_CANCEL) { | |
561fb04a | 6290 | ret = -ECANCELED; |
0c9d5ccd | 6291 | } |
31b51510 | 6292 | |
561fb04a | 6293 | if (!ret) { |
561fb04a | 6294 | do { |
c1379e24 | 6295 | ret = io_issue_sqe(req, false, NULL); |
561fb04a JA |
6296 | /* |
6297 | * We can get EAGAIN for polled IO even though we're | |
6298 | * forcing a sync submission from here, since we can't | |
6299 | * wait for request slots on the block side. | |
6300 | */ | |
6301 | if (ret != -EAGAIN) | |
6302 | break; | |
6303 | cond_resched(); | |
6304 | } while (1); | |
6305 | } | |
31b51510 | 6306 | |
561fb04a | 6307 | if (ret) { |
4e88d6e7 | 6308 | req_set_fail_links(req); |
e1e16097 | 6309 | io_req_complete(req, ret); |
edafccee | 6310 | } |
2b188cc1 | 6311 | |
f4db7182 | 6312 | return io_steal_work(req); |
2b188cc1 JA |
6313 | } |
6314 | ||
65e19f54 JA |
6315 | static inline struct file *io_file_from_index(struct io_ring_ctx *ctx, |
6316 | int index) | |
6317 | { | |
6318 | struct fixed_file_table *table; | |
6319 | ||
05f3fb3c | 6320 | table = &ctx->file_data->table[index >> IORING_FILE_TABLE_SHIFT]; |
84695089 | 6321 | return table->files[index & IORING_FILE_TABLE_MASK]; |
65e19f54 JA |
6322 | } |
6323 | ||
8371adf5 PB |
6324 | static struct file *io_file_get(struct io_submit_state *state, |
6325 | struct io_kiocb *req, int fd, bool fixed) | |
09bb8394 | 6326 | { |
a197f664 | 6327 | struct io_ring_ctx *ctx = req->ctx; |
8da11c19 | 6328 | struct file *file; |
09bb8394 | 6329 | |
8da11c19 | 6330 | if (fixed) { |
479f517b | 6331 | if (unlikely((unsigned int)fd >= ctx->nr_user_files)) |
8371adf5 | 6332 | return NULL; |
b7620121 | 6333 | fd = array_index_nospec(fd, ctx->nr_user_files); |
8da11c19 | 6334 | file = io_file_from_index(ctx, fd); |
fd2206e4 | 6335 | if (file) { |
b2e96852 | 6336 | req->fixed_file_refs = &ctx->file_data->node->refs; |
fd2206e4 JA |
6337 | percpu_ref_get(req->fixed_file_refs); |
6338 | } | |
09bb8394 | 6339 | } else { |
c826bd7a | 6340 | trace_io_uring_file_get(ctx, fd); |
8da11c19 | 6341 | file = __io_file_get(state, fd); |
09bb8394 JA |
6342 | } |
6343 | ||
8371adf5 | 6344 | return file; |
09bb8394 JA |
6345 | } |
6346 | ||
8da11c19 | 6347 | static int io_req_set_file(struct io_submit_state *state, struct io_kiocb *req, |
63ff8223 | 6348 | int fd) |
8da11c19 | 6349 | { |
28cea78a | 6350 | req->file = io_file_get(state, req, fd, req->flags & REQ_F_FIXED_FILE); |
8371adf5 | 6351 | if (req->file || io_op_defs[req->opcode].needs_file_no_error) |
f86cd20c | 6352 | return 0; |
8371adf5 | 6353 | return -EBADF; |
f56040b8 PB |
6354 | } |
6355 | ||
2665abfd | 6356 | static enum hrtimer_restart io_link_timeout_fn(struct hrtimer *timer) |
2b188cc1 | 6357 | { |
ad8a48ac JA |
6358 | struct io_timeout_data *data = container_of(timer, |
6359 | struct io_timeout_data, timer); | |
6360 | struct io_kiocb *req = data->req; | |
2665abfd JA |
6361 | struct io_ring_ctx *ctx = req->ctx; |
6362 | struct io_kiocb *prev = NULL; | |
6363 | unsigned long flags; | |
2665abfd JA |
6364 | |
6365 | spin_lock_irqsave(&ctx->completion_lock, flags); | |
6366 | ||
6367 | /* | |
6368 | * We don't expect the list to be empty, that will only happen if we | |
6369 | * race with the completion of the linked work. | |
6370 | */ | |
4493233e PB |
6371 | if (!list_empty(&req->link_list)) { |
6372 | prev = list_entry(req->link_list.prev, struct io_kiocb, | |
6373 | link_list); | |
900fad45 | 6374 | if (refcount_inc_not_zero(&prev->refs)) |
4493233e | 6375 | list_del_init(&req->link_list); |
900fad45 | 6376 | else |
76a46e06 | 6377 | prev = NULL; |
2665abfd JA |
6378 | } |
6379 | ||
6380 | spin_unlock_irqrestore(&ctx->completion_lock, flags); | |
6381 | ||
6382 | if (prev) { | |
4e88d6e7 | 6383 | req_set_fail_links(prev); |
014db007 | 6384 | io_async_find_and_cancel(ctx, req, prev->user_data, -ETIME); |
76a46e06 | 6385 | io_put_req(prev); |
47f46768 | 6386 | } else { |
e1e16097 | 6387 | io_req_complete(req, -ETIME); |
2665abfd | 6388 | } |
2665abfd JA |
6389 | return HRTIMER_NORESTART; |
6390 | } | |
6391 | ||
7271ef3a | 6392 | static void __io_queue_linked_timeout(struct io_kiocb *req) |
2665abfd | 6393 | { |
76a46e06 JA |
6394 | /* |
6395 | * If the list is now empty, then our linked request finished before | |
6396 | * we got a chance to setup the timer | |
6397 | */ | |
4493233e | 6398 | if (!list_empty(&req->link_list)) { |
e8c2bc1f | 6399 | struct io_timeout_data *data = req->async_data; |
94ae5e77 | 6400 | |
ad8a48ac JA |
6401 | data->timer.function = io_link_timeout_fn; |
6402 | hrtimer_start(&data->timer, timespec64_to_ktime(data->ts), | |
6403 | data->mode); | |
2665abfd | 6404 | } |
7271ef3a JA |
6405 | } |
6406 | ||
6407 | static void io_queue_linked_timeout(struct io_kiocb *req) | |
6408 | { | |
6409 | struct io_ring_ctx *ctx = req->ctx; | |
6410 | ||
6411 | spin_lock_irq(&ctx->completion_lock); | |
6412 | __io_queue_linked_timeout(req); | |
76a46e06 | 6413 | spin_unlock_irq(&ctx->completion_lock); |
2665abfd | 6414 | |
2665abfd | 6415 | /* drop submission reference */ |
76a46e06 JA |
6416 | io_put_req(req); |
6417 | } | |
2665abfd | 6418 | |
ad8a48ac | 6419 | static struct io_kiocb *io_prep_linked_timeout(struct io_kiocb *req) |
2665abfd JA |
6420 | { |
6421 | struct io_kiocb *nxt; | |
6422 | ||
dea3b49c | 6423 | if (!(req->flags & REQ_F_LINK_HEAD)) |
2665abfd | 6424 | return NULL; |
6df1db6b | 6425 | if (req->flags & REQ_F_LINK_TIMEOUT) |
d7718a9d | 6426 | return NULL; |
2665abfd | 6427 | |
4493233e PB |
6428 | nxt = list_first_entry_or_null(&req->link_list, struct io_kiocb, |
6429 | link_list); | |
d625c6ee | 6430 | if (!nxt || nxt->opcode != IORING_OP_LINK_TIMEOUT) |
76a46e06 | 6431 | return NULL; |
2665abfd | 6432 | |
900fad45 | 6433 | nxt->flags |= REQ_F_LTIMEOUT_ACTIVE; |
76a46e06 | 6434 | req->flags |= REQ_F_LINK_TIMEOUT; |
76a46e06 | 6435 | return nxt; |
2665abfd JA |
6436 | } |
6437 | ||
c1379e24 | 6438 | static void __io_queue_sqe(struct io_kiocb *req, struct io_comp_state *cs) |
2b188cc1 | 6439 | { |
4a0a7a18 | 6440 | struct io_kiocb *linked_timeout; |
193155c8 | 6441 | const struct cred *old_creds = NULL; |
e0c5c576 | 6442 | int ret; |
2b188cc1 | 6443 | |
4a0a7a18 JA |
6444 | again: |
6445 | linked_timeout = io_prep_linked_timeout(req); | |
6446 | ||
2e5aa6cb PB |
6447 | if ((req->flags & REQ_F_WORK_INITIALIZED) && |
6448 | (req->work.flags & IO_WQ_WORK_CREDS) && | |
98447d65 | 6449 | req->work.identity->creds != current_cred()) { |
193155c8 JA |
6450 | if (old_creds) |
6451 | revert_creds(old_creds); | |
98447d65 | 6452 | if (old_creds == req->work.identity->creds) |
193155c8 JA |
6453 | old_creds = NULL; /* restored original creds */ |
6454 | else | |
98447d65 | 6455 | old_creds = override_creds(req->work.identity->creds); |
193155c8 JA |
6456 | } |
6457 | ||
c1379e24 | 6458 | ret = io_issue_sqe(req, true, cs); |
491381ce JA |
6459 | |
6460 | /* | |
6461 | * We async punt it if the file wasn't marked NOWAIT, or if the file | |
6462 | * doesn't support non-blocking read/write attempts | |
6463 | */ | |
24c74678 | 6464 | if (ret == -EAGAIN && !(req->flags & REQ_F_NOWAIT)) { |
f063c547 | 6465 | if (!io_arm_poll_handler(req)) { |
f063c547 PB |
6466 | /* |
6467 | * Queued up for async execution, worker will release | |
6468 | * submit reference when the iocb is actually submitted. | |
6469 | */ | |
6470 | io_queue_async_work(req); | |
2b188cc1 | 6471 | } |
bbad27b2 | 6472 | |
f063c547 PB |
6473 | if (linked_timeout) |
6474 | io_queue_linked_timeout(linked_timeout); | |
0d63c148 PB |
6475 | } else if (likely(!ret)) { |
6476 | /* drop submission reference */ | |
6477 | req = io_put_req_find_next(req); | |
6478 | if (linked_timeout) | |
6479 | io_queue_linked_timeout(linked_timeout); | |
e65ef56d | 6480 | |
0d63c148 PB |
6481 | if (req) { |
6482 | if (!(req->flags & REQ_F_FORCE_ASYNC)) | |
6483 | goto again; | |
6484 | io_queue_async_work(req); | |
6485 | } | |
6486 | } else { | |
652532ad PB |
6487 | /* un-prep timeout, so it'll be killed as any other linked */ |
6488 | req->flags &= ~REQ_F_LINK_TIMEOUT; | |
4e88d6e7 | 6489 | req_set_fail_links(req); |
e65ef56d | 6490 | io_put_req(req); |
e1e16097 | 6491 | io_req_complete(req, ret); |
9e645e11 | 6492 | } |
652532ad | 6493 | |
193155c8 JA |
6494 | if (old_creds) |
6495 | revert_creds(old_creds); | |
2b188cc1 JA |
6496 | } |
6497 | ||
f13fad7b JA |
6498 | static void io_queue_sqe(struct io_kiocb *req, const struct io_uring_sqe *sqe, |
6499 | struct io_comp_state *cs) | |
4fe2c963 JL |
6500 | { |
6501 | int ret; | |
6502 | ||
3529d8c2 | 6503 | ret = io_req_defer(req, sqe); |
4fe2c963 JL |
6504 | if (ret) { |
6505 | if (ret != -EIOCBQUEUED) { | |
1118591a | 6506 | fail_req: |
4e88d6e7 | 6507 | req_set_fail_links(req); |
e1e16097 JA |
6508 | io_put_req(req); |
6509 | io_req_complete(req, ret); | |
4fe2c963 | 6510 | } |
2550878f | 6511 | } else if (req->flags & REQ_F_FORCE_ASYNC) { |
e8c2bc1f | 6512 | if (!req->async_data) { |
bd2ab18a | 6513 | ret = io_req_defer_prep(req, sqe); |
327d6d96 | 6514 | if (unlikely(ret)) |
bd2ab18a PB |
6515 | goto fail_req; |
6516 | } | |
ce35a47a JA |
6517 | io_queue_async_work(req); |
6518 | } else { | |
c1379e24 PB |
6519 | if (sqe) { |
6520 | ret = io_req_prep(req, sqe); | |
6521 | if (unlikely(ret)) | |
6522 | goto fail_req; | |
6523 | } | |
6524 | __io_queue_sqe(req, cs); | |
ce35a47a | 6525 | } |
4fe2c963 JL |
6526 | } |
6527 | ||
f13fad7b JA |
6528 | static inline void io_queue_link_head(struct io_kiocb *req, |
6529 | struct io_comp_state *cs) | |
4fe2c963 | 6530 | { |
94ae5e77 | 6531 | if (unlikely(req->flags & REQ_F_FAIL_LINK)) { |
e1e16097 JA |
6532 | io_put_req(req); |
6533 | io_req_complete(req, -ECANCELED); | |
1b4a51b6 | 6534 | } else |
f13fad7b | 6535 | io_queue_sqe(req, NULL, cs); |
4fe2c963 JL |
6536 | } |
6537 | ||
1d4240cc | 6538 | static int io_submit_sqe(struct io_kiocb *req, const struct io_uring_sqe *sqe, |
f13fad7b | 6539 | struct io_kiocb **link, struct io_comp_state *cs) |
9e645e11 | 6540 | { |
a197f664 | 6541 | struct io_ring_ctx *ctx = req->ctx; |
ef4ff581 | 6542 | int ret; |
9e645e11 | 6543 | |
9e645e11 JA |
6544 | /* |
6545 | * If we already have a head request, queue this one for async | |
6546 | * submittal once the head completes. If we don't have a head but | |
6547 | * IOSQE_IO_LINK is set in the sqe, start a new head. This one will be | |
6548 | * submitted sync once the chain is complete. If none of those | |
6549 | * conditions are true (normal request), then just queue it. | |
6550 | */ | |
6551 | if (*link) { | |
9d76377f | 6552 | struct io_kiocb *head = *link; |
4e88d6e7 | 6553 | |
8cdf2193 PB |
6554 | /* |
6555 | * Taking sequential execution of a link, draining both sides | |
6556 | * of the link also fullfils IOSQE_IO_DRAIN semantics for all | |
6557 | * requests in the link. So, it drains the head and the | |
6558 | * next after the link request. The last one is done via | |
6559 | * drain_next flag to persist the effect across calls. | |
6560 | */ | |
ef4ff581 | 6561 | if (req->flags & REQ_F_IO_DRAIN) { |
711be031 PB |
6562 | head->flags |= REQ_F_IO_DRAIN; |
6563 | ctx->drain_next = 1; | |
6564 | } | |
3529d8c2 | 6565 | ret = io_req_defer_prep(req, sqe); |
327d6d96 | 6566 | if (unlikely(ret)) { |
4e88d6e7 | 6567 | /* fail even hard links since we don't submit */ |
9d76377f | 6568 | head->flags |= REQ_F_FAIL_LINK; |
1d4240cc | 6569 | return ret; |
2d28390a | 6570 | } |
9d76377f PB |
6571 | trace_io_uring_link(ctx, req, head); |
6572 | list_add_tail(&req->link_list, &head->link_list); | |
32fe525b PB |
6573 | |
6574 | /* last request of a link, enqueue the link */ | |
ef4ff581 | 6575 | if (!(req->flags & (REQ_F_LINK | REQ_F_HARDLINK))) { |
f13fad7b | 6576 | io_queue_link_head(head, cs); |
32fe525b PB |
6577 | *link = NULL; |
6578 | } | |
9e645e11 | 6579 | } else { |
711be031 PB |
6580 | if (unlikely(ctx->drain_next)) { |
6581 | req->flags |= REQ_F_IO_DRAIN; | |
ef4ff581 | 6582 | ctx->drain_next = 0; |
711be031 | 6583 | } |
ef4ff581 | 6584 | if (req->flags & (REQ_F_LINK | REQ_F_HARDLINK)) { |
dea3b49c | 6585 | req->flags |= REQ_F_LINK_HEAD; |
711be031 | 6586 | INIT_LIST_HEAD(&req->link_list); |
f1d96a8f | 6587 | |
711be031 | 6588 | ret = io_req_defer_prep(req, sqe); |
327d6d96 | 6589 | if (unlikely(ret)) |
711be031 PB |
6590 | req->flags |= REQ_F_FAIL_LINK; |
6591 | *link = req; | |
6592 | } else { | |
f13fad7b | 6593 | io_queue_sqe(req, sqe, cs); |
711be031 | 6594 | } |
9e645e11 | 6595 | } |
2e6e1fde | 6596 | |
1d4240cc | 6597 | return 0; |
9e645e11 JA |
6598 | } |
6599 | ||
9a56a232 JA |
6600 | /* |
6601 | * Batched submission is done, ensure local IO is flushed out. | |
6602 | */ | |
6603 | static void io_submit_state_end(struct io_submit_state *state) | |
6604 | { | |
f13fad7b JA |
6605 | if (!list_empty(&state->comp.list)) |
6606 | io_submit_flush_completions(&state->comp); | |
9a56a232 | 6607 | blk_finish_plug(&state->plug); |
9f13c35b | 6608 | io_state_file_put(state); |
2579f913 | 6609 | if (state->free_reqs) |
6c8a3134 | 6610 | kmem_cache_free_bulk(req_cachep, state->free_reqs, state->reqs); |
9a56a232 JA |
6611 | } |
6612 | ||
6613 | /* | |
6614 | * Start submission side cache. | |
6615 | */ | |
6616 | static void io_submit_state_start(struct io_submit_state *state, | |
013538bd | 6617 | struct io_ring_ctx *ctx, unsigned int max_ios) |
9a56a232 JA |
6618 | { |
6619 | blk_start_plug(&state->plug); | |
013538bd JA |
6620 | state->comp.nr = 0; |
6621 | INIT_LIST_HEAD(&state->comp.list); | |
6622 | state->comp.ctx = ctx; | |
2579f913 | 6623 | state->free_reqs = 0; |
9a56a232 JA |
6624 | state->file = NULL; |
6625 | state->ios_left = max_ios; | |
6626 | } | |
6627 | ||
2b188cc1 JA |
6628 | static void io_commit_sqring(struct io_ring_ctx *ctx) |
6629 | { | |
75b28aff | 6630 | struct io_rings *rings = ctx->rings; |
2b188cc1 | 6631 | |
caf582c6 PB |
6632 | /* |
6633 | * Ensure any loads from the SQEs are done at this point, | |
6634 | * since once we write the new head, the application could | |
6635 | * write new data to them. | |
6636 | */ | |
6637 | smp_store_release(&rings->sq.head, ctx->cached_sq_head); | |
2b188cc1 JA |
6638 | } |
6639 | ||
2b188cc1 | 6640 | /* |
3529d8c2 | 6641 | * Fetch an sqe, if one is available. Note that sqe_ptr will point to memory |
2b188cc1 JA |
6642 | * that is mapped by userspace. This means that care needs to be taken to |
6643 | * ensure that reads are stable, as we cannot rely on userspace always | |
6644 | * being a good citizen. If members of the sqe are validated and then later | |
6645 | * used, it's important that those reads are done through READ_ONCE() to | |
6646 | * prevent a re-load down the line. | |
6647 | */ | |
709b302f | 6648 | static const struct io_uring_sqe *io_get_sqe(struct io_ring_ctx *ctx) |
2b188cc1 | 6649 | { |
75b28aff | 6650 | u32 *sq_array = ctx->sq_array; |
2b188cc1 JA |
6651 | unsigned head; |
6652 | ||
6653 | /* | |
6654 | * The cached sq head (or cq tail) serves two purposes: | |
6655 | * | |
6656 | * 1) allows us to batch the cost of updating the user visible | |
6657 | * head updates. | |
6658 | * 2) allows the kernel side to track the head on its own, even | |
6659 | * though the application is the one updating it. | |
6660 | */ | |
ee7d46d9 | 6661 | head = READ_ONCE(sq_array[ctx->cached_sq_head & ctx->sq_mask]); |
709b302f PB |
6662 | if (likely(head < ctx->sq_entries)) |
6663 | return &ctx->sq_sqes[head]; | |
2b188cc1 JA |
6664 | |
6665 | /* drop invalid entries */ | |
498ccd9e | 6666 | ctx->cached_sq_dropped++; |
ee7d46d9 | 6667 | WRITE_ONCE(ctx->rings->sq_dropped, ctx->cached_sq_dropped); |
709b302f PB |
6668 | return NULL; |
6669 | } | |
6670 | ||
6671 | static inline void io_consume_sqe(struct io_ring_ctx *ctx) | |
6672 | { | |
6673 | ctx->cached_sq_head++; | |
2b188cc1 JA |
6674 | } |
6675 | ||
21b55dbc SG |
6676 | /* |
6677 | * Check SQE restrictions (opcode and flags). | |
6678 | * | |
6679 | * Returns 'true' if SQE is allowed, 'false' otherwise. | |
6680 | */ | |
6681 | static inline bool io_check_restriction(struct io_ring_ctx *ctx, | |
6682 | struct io_kiocb *req, | |
6683 | unsigned int sqe_flags) | |
6684 | { | |
6685 | if (!ctx->restricted) | |
6686 | return true; | |
6687 | ||
6688 | if (!test_bit(req->opcode, ctx->restrictions.sqe_op)) | |
6689 | return false; | |
6690 | ||
6691 | if ((sqe_flags & ctx->restrictions.sqe_flags_required) != | |
6692 | ctx->restrictions.sqe_flags_required) | |
6693 | return false; | |
6694 | ||
6695 | if (sqe_flags & ~(ctx->restrictions.sqe_flags_allowed | | |
6696 | ctx->restrictions.sqe_flags_required)) | |
6697 | return false; | |
6698 | ||
6699 | return true; | |
6700 | } | |
6701 | ||
ef4ff581 PB |
6702 | #define SQE_VALID_FLAGS (IOSQE_FIXED_FILE|IOSQE_IO_DRAIN|IOSQE_IO_LINK| \ |
6703 | IOSQE_IO_HARDLINK | IOSQE_ASYNC | \ | |
6704 | IOSQE_BUFFER_SELECT) | |
6705 | ||
6706 | static int io_init_req(struct io_ring_ctx *ctx, struct io_kiocb *req, | |
6707 | const struct io_uring_sqe *sqe, | |
0cdaf760 | 6708 | struct io_submit_state *state) |
0553b8bd | 6709 | { |
ef4ff581 | 6710 | unsigned int sqe_flags; |
71b547c0 | 6711 | int id, ret; |
ef4ff581 | 6712 | |
0553b8bd PB |
6713 | req->opcode = READ_ONCE(sqe->opcode); |
6714 | req->user_data = READ_ONCE(sqe->user_data); | |
e8c2bc1f | 6715 | req->async_data = NULL; |
0553b8bd PB |
6716 | req->file = NULL; |
6717 | req->ctx = ctx; | |
6718 | req->flags = 0; | |
6719 | /* one is dropped after submission, the other at completion */ | |
6720 | refcount_set(&req->refs, 2); | |
4dd2824d | 6721 | req->task = current; |
0553b8bd | 6722 | req->result = 0; |
ef4ff581 PB |
6723 | |
6724 | if (unlikely(req->opcode >= IORING_OP_LAST)) | |
6725 | return -EINVAL; | |
6726 | ||
28cea78a | 6727 | if (unlikely(io_sq_thread_acquire_mm_files(ctx, req))) |
9d8426a0 | 6728 | return -EFAULT; |
ef4ff581 PB |
6729 | |
6730 | sqe_flags = READ_ONCE(sqe->flags); | |
6731 | /* enforce forwards compatibility on users */ | |
6732 | if (unlikely(sqe_flags & ~SQE_VALID_FLAGS)) | |
6733 | return -EINVAL; | |
6734 | ||
21b55dbc SG |
6735 | if (unlikely(!io_check_restriction(ctx, req, sqe_flags))) |
6736 | return -EACCES; | |
6737 | ||
ef4ff581 PB |
6738 | if ((sqe_flags & IOSQE_BUFFER_SELECT) && |
6739 | !io_op_defs[req->opcode].buffer_select) | |
6740 | return -EOPNOTSUPP; | |
6741 | ||
6742 | id = READ_ONCE(sqe->personality); | |
6743 | if (id) { | |
1e6fa521 JA |
6744 | struct io_identity *iod; |
6745 | ||
1e6fa521 JA |
6746 | iod = idr_find(&ctx->personality_idr, id); |
6747 | if (unlikely(!iod)) | |
ef4ff581 | 6748 | return -EINVAL; |
1e6fa521 | 6749 | refcount_inc(&iod->count); |
ec99ca6c PB |
6750 | |
6751 | __io_req_init_async(req); | |
1e6fa521 JA |
6752 | get_cred(iod->creds); |
6753 | req->work.identity = iod; | |
dfead8a8 | 6754 | req->work.flags |= IO_WQ_WORK_CREDS; |
ef4ff581 PB |
6755 | } |
6756 | ||
6757 | /* same numerical values with corresponding REQ_F_*, safe to copy */ | |
c11368a5 | 6758 | req->flags |= sqe_flags; |
ef4ff581 | 6759 | |
63ff8223 JA |
6760 | if (!io_op_defs[req->opcode].needs_file) |
6761 | return 0; | |
6762 | ||
71b547c0 PB |
6763 | ret = io_req_set_file(state, req, READ_ONCE(sqe->fd)); |
6764 | state->ios_left--; | |
6765 | return ret; | |
0553b8bd PB |
6766 | } |
6767 | ||
0f212204 | 6768 | static int io_submit_sqes(struct io_ring_ctx *ctx, unsigned int nr) |
6c271ce2 | 6769 | { |
ac8691c4 | 6770 | struct io_submit_state state; |
9e645e11 | 6771 | struct io_kiocb *link = NULL; |
9e645e11 | 6772 | int i, submitted = 0; |
6c271ce2 | 6773 | |
c4a2ed72 | 6774 | /* if we have a backlog and couldn't flush it all, return BUSY */ |
ad3eb2c8 JA |
6775 | if (test_bit(0, &ctx->sq_check_overflow)) { |
6776 | if (!list_empty(&ctx->cq_overflow_list) && | |
e6c8aa9a | 6777 | !io_cqring_overflow_flush(ctx, false, NULL, NULL)) |
ad3eb2c8 JA |
6778 | return -EBUSY; |
6779 | } | |
6c271ce2 | 6780 | |
ee7d46d9 PB |
6781 | /* make sure SQ entry isn't read before tail */ |
6782 | nr = min3(nr, ctx->sq_entries, io_sqring_entries(ctx)); | |
9ef4f124 | 6783 | |
2b85edfc PB |
6784 | if (!percpu_ref_tryget_many(&ctx->refs, nr)) |
6785 | return -EAGAIN; | |
6c271ce2 | 6786 | |
d8a6df10 | 6787 | percpu_counter_add(¤t->io_uring->inflight, nr); |
faf7b51c | 6788 | refcount_add(nr, ¤t->usage); |
6c271ce2 | 6789 | |
013538bd | 6790 | io_submit_state_start(&state, ctx, nr); |
b14cca0c | 6791 | |
6c271ce2 | 6792 | for (i = 0; i < nr; i++) { |
3529d8c2 | 6793 | const struct io_uring_sqe *sqe; |
196be95c | 6794 | struct io_kiocb *req; |
1cb1edb2 | 6795 | int err; |
fb5ccc98 | 6796 | |
b1e50e54 PB |
6797 | sqe = io_get_sqe(ctx); |
6798 | if (unlikely(!sqe)) { | |
6799 | io_consume_sqe(ctx); | |
6800 | break; | |
6801 | } | |
ac8691c4 | 6802 | req = io_alloc_req(ctx, &state); |
196be95c PB |
6803 | if (unlikely(!req)) { |
6804 | if (!submitted) | |
6805 | submitted = -EAGAIN; | |
fb5ccc98 | 6806 | break; |
196be95c | 6807 | } |
709b302f | 6808 | io_consume_sqe(ctx); |
d3656344 JA |
6809 | /* will complete beyond this point, count as submitted */ |
6810 | submitted++; | |
6811 | ||
692d8363 | 6812 | err = io_init_req(ctx, req, sqe, &state); |
ef4ff581 | 6813 | if (unlikely(err)) { |
1cb1edb2 | 6814 | fail_req: |
e1e16097 JA |
6815 | io_put_req(req); |
6816 | io_req_complete(req, err); | |
196be95c PB |
6817 | break; |
6818 | } | |
fb5ccc98 | 6819 | |
354420f7 | 6820 | trace_io_uring_submit_sqe(ctx, req->opcode, req->user_data, |
0cdaf760 | 6821 | true, io_async_submit(ctx)); |
f13fad7b | 6822 | err = io_submit_sqe(req, sqe, &link, &state.comp); |
1d4240cc PB |
6823 | if (err) |
6824 | goto fail_req; | |
6c271ce2 JA |
6825 | } |
6826 | ||
9466f437 PB |
6827 | if (unlikely(submitted != nr)) { |
6828 | int ref_used = (submitted == -EAGAIN) ? 0 : submitted; | |
d8a6df10 JA |
6829 | struct io_uring_task *tctx = current->io_uring; |
6830 | int unused = nr - ref_used; | |
9466f437 | 6831 | |
d8a6df10 JA |
6832 | percpu_ref_put_many(&ctx->refs, unused); |
6833 | percpu_counter_sub(&tctx->inflight, unused); | |
6834 | put_task_struct_many(current, unused); | |
9466f437 | 6835 | } |
9e645e11 | 6836 | if (link) |
f13fad7b | 6837 | io_queue_link_head(link, &state.comp); |
ac8691c4 | 6838 | io_submit_state_end(&state); |
6c271ce2 | 6839 | |
ae9428ca PB |
6840 | /* Commit SQ ring head once we've consumed and submitted all SQEs */ |
6841 | io_commit_sqring(ctx); | |
6842 | ||
6c271ce2 JA |
6843 | return submitted; |
6844 | } | |
6845 | ||
23b3628e XW |
6846 | static inline void io_ring_set_wakeup_flag(struct io_ring_ctx *ctx) |
6847 | { | |
6848 | /* Tell userspace we may need a wakeup call */ | |
6849 | spin_lock_irq(&ctx->completion_lock); | |
6850 | ctx->rings->sq_flags |= IORING_SQ_NEED_WAKEUP; | |
6851 | spin_unlock_irq(&ctx->completion_lock); | |
6852 | } | |
6853 | ||
6854 | static inline void io_ring_clear_wakeup_flag(struct io_ring_ctx *ctx) | |
6855 | { | |
6856 | spin_lock_irq(&ctx->completion_lock); | |
6857 | ctx->rings->sq_flags &= ~IORING_SQ_NEED_WAKEUP; | |
6858 | spin_unlock_irq(&ctx->completion_lock); | |
6859 | } | |
6860 | ||
3f0e64d0 JA |
6861 | static int io_sq_wake_function(struct wait_queue_entry *wqe, unsigned mode, |
6862 | int sync, void *key) | |
6c271ce2 | 6863 | { |
3f0e64d0 JA |
6864 | struct io_ring_ctx *ctx = container_of(wqe, struct io_ring_ctx, sqo_wait_entry); |
6865 | int ret; | |
6866 | ||
6867 | ret = autoremove_wake_function(wqe, mode, sync, key); | |
6868 | if (ret) { | |
6869 | unsigned long flags; | |
6870 | ||
6871 | spin_lock_irqsave(&ctx->completion_lock, flags); | |
6872 | ctx->rings->sq_flags &= ~IORING_SQ_NEED_WAKEUP; | |
6873 | spin_unlock_irqrestore(&ctx->completion_lock, flags); | |
6874 | } | |
6875 | return ret; | |
6876 | } | |
6877 | ||
c8d1ba58 JA |
6878 | enum sq_ret { |
6879 | SQT_IDLE = 1, | |
6880 | SQT_SPIN = 2, | |
6881 | SQT_DID_WORK = 4, | |
6882 | }; | |
6883 | ||
6884 | static enum sq_ret __io_sq_thread(struct io_ring_ctx *ctx, | |
e95eee2d | 6885 | unsigned long start_jiffies, bool cap_entries) |
6c271ce2 | 6886 | { |
c8d1ba58 | 6887 | unsigned long timeout = start_jiffies + ctx->sq_thread_idle; |
534ca6d6 | 6888 | struct io_sq_data *sqd = ctx->sq_data; |
c8d1ba58 | 6889 | unsigned int to_submit; |
bdcd3eab | 6890 | int ret = 0; |
6c271ce2 | 6891 | |
c8d1ba58 JA |
6892 | again: |
6893 | if (!list_empty(&ctx->iopoll_list)) { | |
6894 | unsigned nr_events = 0; | |
a4c0b3de | 6895 | |
c8d1ba58 JA |
6896 | mutex_lock(&ctx->uring_lock); |
6897 | if (!list_empty(&ctx->iopoll_list) && !need_resched()) | |
6898 | io_do_iopoll(ctx, &nr_events, 0); | |
6899 | mutex_unlock(&ctx->uring_lock); | |
6900 | } | |
6c271ce2 | 6901 | |
c8d1ba58 | 6902 | to_submit = io_sqring_entries(ctx); |
6c271ce2 | 6903 | |
c8d1ba58 JA |
6904 | /* |
6905 | * If submit got -EBUSY, flag us as needing the application | |
6906 | * to enter the kernel to reap and flush events. | |
6907 | */ | |
6908 | if (!to_submit || ret == -EBUSY || need_resched()) { | |
6909 | /* | |
6910 | * Drop cur_mm before scheduling, we can't hold it for | |
6911 | * long periods (or over schedule()). Do this before | |
6912 | * adding ourselves to the waitqueue, as the unuse/drop | |
6913 | * may sleep. | |
6914 | */ | |
28cea78a | 6915 | io_sq_thread_drop_mm_files(); |
6c271ce2 | 6916 | |
c8d1ba58 JA |
6917 | /* |
6918 | * We're polling. If we're within the defined idle | |
6919 | * period, then let us spin without work before going | |
6920 | * to sleep. The exception is if we got EBUSY doing | |
6921 | * more IO, we should wait for the application to | |
6922 | * reap events and wake us up. | |
6923 | */ | |
6924 | if (!list_empty(&ctx->iopoll_list) || need_resched() || | |
6925 | (!time_after(jiffies, timeout) && ret != -EBUSY && | |
6926 | !percpu_ref_is_dying(&ctx->refs))) | |
6927 | return SQT_SPIN; | |
6c271ce2 | 6928 | |
534ca6d6 | 6929 | prepare_to_wait(&sqd->wait, &ctx->sqo_wait_entry, |
c8d1ba58 | 6930 | TASK_INTERRUPTIBLE); |
6c271ce2 | 6931 | |
c8d1ba58 JA |
6932 | /* |
6933 | * While doing polled IO, before going to sleep, we need | |
6934 | * to check if there are new reqs added to iopoll_list, | |
6935 | * it is because reqs may have been punted to io worker | |
6936 | * and will be added to iopoll_list later, hence check | |
6937 | * the iopoll_list again. | |
6938 | */ | |
6939 | if ((ctx->flags & IORING_SETUP_IOPOLL) && | |
6940 | !list_empty_careful(&ctx->iopoll_list)) { | |
534ca6d6 | 6941 | finish_wait(&sqd->wait, &ctx->sqo_wait_entry); |
c8d1ba58 | 6942 | goto again; |
6c271ce2 JA |
6943 | } |
6944 | ||
fb5ccc98 | 6945 | to_submit = io_sqring_entries(ctx); |
c8d1ba58 JA |
6946 | if (!to_submit || ret == -EBUSY) |
6947 | return SQT_IDLE; | |
6948 | } | |
c1edbf5f | 6949 | |
534ca6d6 | 6950 | finish_wait(&sqd->wait, &ctx->sqo_wait_entry); |
c8d1ba58 | 6951 | io_ring_clear_wakeup_flag(ctx); |
7143b5ac | 6952 | |
e95eee2d JA |
6953 | /* if we're handling multiple rings, cap submit size for fairness */ |
6954 | if (cap_entries && to_submit > 8) | |
6955 | to_submit = 8; | |
6956 | ||
c8d1ba58 JA |
6957 | mutex_lock(&ctx->uring_lock); |
6958 | if (likely(!percpu_ref_is_dying(&ctx->refs))) | |
6959 | ret = io_submit_sqes(ctx, to_submit); | |
6960 | mutex_unlock(&ctx->uring_lock); | |
90554200 JA |
6961 | |
6962 | if (!io_sqring_full(ctx) && wq_has_sleeper(&ctx->sqo_sq_wait)) | |
6963 | wake_up(&ctx->sqo_sq_wait); | |
6964 | ||
c8d1ba58 JA |
6965 | return SQT_DID_WORK; |
6966 | } | |
6c271ce2 | 6967 | |
69fb2131 JA |
6968 | static void io_sqd_init_new(struct io_sq_data *sqd) |
6969 | { | |
6970 | struct io_ring_ctx *ctx; | |
6971 | ||
6972 | while (!list_empty(&sqd->ctx_new_list)) { | |
6973 | ctx = list_first_entry(&sqd->ctx_new_list, struct io_ring_ctx, sqd_list); | |
6974 | init_wait(&ctx->sqo_wait_entry); | |
6975 | ctx->sqo_wait_entry.func = io_sq_wake_function; | |
6976 | list_move_tail(&ctx->sqd_list, &sqd->ctx_list); | |
6977 | complete(&ctx->sq_thread_comp); | |
6978 | } | |
6979 | } | |
6980 | ||
c8d1ba58 JA |
6981 | static int io_sq_thread(void *data) |
6982 | { | |
91d8f519 | 6983 | struct cgroup_subsys_state *cur_css = NULL; |
28cea78a JA |
6984 | struct files_struct *old_files = current->files; |
6985 | struct nsproxy *old_nsproxy = current->nsproxy; | |
69fb2131 JA |
6986 | const struct cred *old_cred = NULL; |
6987 | struct io_sq_data *sqd = data; | |
6988 | struct io_ring_ctx *ctx; | |
c8d1ba58 | 6989 | unsigned long start_jiffies; |
6c271ce2 | 6990 | |
28cea78a JA |
6991 | task_lock(current); |
6992 | current->files = NULL; | |
6993 | current->nsproxy = NULL; | |
6994 | task_unlock(current); | |
6995 | ||
69fb2131 JA |
6996 | start_jiffies = jiffies; |
6997 | while (!kthread_should_stop()) { | |
6998 | enum sq_ret ret = 0; | |
e95eee2d | 6999 | bool cap_entries; |
c1edbf5f JA |
7000 | |
7001 | /* | |
69fb2131 JA |
7002 | * Any changes to the sqd lists are synchronized through the |
7003 | * kthread parking. This synchronizes the thread vs users, | |
7004 | * the users are synchronized on the sqd->ctx_lock. | |
c1edbf5f | 7005 | */ |
69fb2131 JA |
7006 | if (kthread_should_park()) |
7007 | kthread_parkme(); | |
7143b5ac | 7008 | |
69fb2131 JA |
7009 | if (unlikely(!list_empty(&sqd->ctx_new_list))) |
7010 | io_sqd_init_new(sqd); | |
6c271ce2 | 7011 | |
e95eee2d | 7012 | cap_entries = !list_is_singular(&sqd->ctx_list); |
6c271ce2 | 7013 | |
69fb2131 JA |
7014 | list_for_each_entry(ctx, &sqd->ctx_list, sqd_list) { |
7015 | if (current->cred != ctx->creds) { | |
7016 | if (old_cred) | |
7017 | revert_creds(old_cred); | |
7018 | old_cred = override_creds(ctx->creds); | |
bdcd3eab | 7019 | } |
91d8f519 | 7020 | io_sq_thread_associate_blkcg(ctx, &cur_css); |
4ea33a97 JA |
7021 | #ifdef CONFIG_AUDIT |
7022 | current->loginuid = ctx->loginuid; | |
7023 | current->sessionid = ctx->sessionid; | |
7024 | #endif | |
bdcd3eab | 7025 | |
e95eee2d | 7026 | ret |= __io_sq_thread(ctx, start_jiffies, cap_entries); |
6c271ce2 | 7027 | |
28cea78a | 7028 | io_sq_thread_drop_mm_files(); |
69fb2131 | 7029 | } |
6c271ce2 | 7030 | |
69fb2131 | 7031 | if (ret & SQT_SPIN) { |
c8d1ba58 JA |
7032 | io_run_task_work(); |
7033 | cond_resched(); | |
69fb2131 JA |
7034 | } else if (ret == SQT_IDLE) { |
7035 | if (kthread_should_park()) | |
6c271ce2 | 7036 | continue; |
69fb2131 JA |
7037 | list_for_each_entry(ctx, &sqd->ctx_list, sqd_list) |
7038 | io_ring_set_wakeup_flag(ctx); | |
7039 | schedule(); | |
7040 | start_jiffies = jiffies; | |
7041 | list_for_each_entry(ctx, &sqd->ctx_list, sqd_list) | |
7042 | io_ring_clear_wakeup_flag(ctx); | |
6c271ce2 | 7043 | } |
6c271ce2 JA |
7044 | } |
7045 | ||
4c6e277c | 7046 | io_run_task_work(); |
b41e9852 | 7047 | |
91d8f519 DZ |
7048 | if (cur_css) |
7049 | io_sq_thread_unassociate_blkcg(); | |
69fb2131 JA |
7050 | if (old_cred) |
7051 | revert_creds(old_cred); | |
06058632 | 7052 | |
28cea78a JA |
7053 | task_lock(current); |
7054 | current->files = old_files; | |
7055 | current->nsproxy = old_nsproxy; | |
7056 | task_unlock(current); | |
7057 | ||
2bbcd6d3 | 7058 | kthread_parkme(); |
06058632 | 7059 | |
6c271ce2 JA |
7060 | return 0; |
7061 | } | |
7062 | ||
bda52162 JA |
7063 | struct io_wait_queue { |
7064 | struct wait_queue_entry wq; | |
7065 | struct io_ring_ctx *ctx; | |
7066 | unsigned to_wait; | |
7067 | unsigned nr_timeouts; | |
7068 | }; | |
7069 | ||
1d7bb1d5 | 7070 | static inline bool io_should_wake(struct io_wait_queue *iowq, bool noflush) |
bda52162 JA |
7071 | { |
7072 | struct io_ring_ctx *ctx = iowq->ctx; | |
7073 | ||
7074 | /* | |
d195a66e | 7075 | * Wake up if we have enough events, or if a timeout occurred since we |
bda52162 JA |
7076 | * started waiting. For timeouts, we always want to return to userspace, |
7077 | * regardless of event count. | |
7078 | */ | |
1d7bb1d5 | 7079 | return io_cqring_events(ctx, noflush) >= iowq->to_wait || |
bda52162 JA |
7080 | atomic_read(&ctx->cq_timeouts) != iowq->nr_timeouts; |
7081 | } | |
7082 | ||
7083 | static int io_wake_function(struct wait_queue_entry *curr, unsigned int mode, | |
7084 | int wake_flags, void *key) | |
7085 | { | |
7086 | struct io_wait_queue *iowq = container_of(curr, struct io_wait_queue, | |
7087 | wq); | |
7088 | ||
1d7bb1d5 JA |
7089 | /* use noflush == true, as we can't safely rely on locking context */ |
7090 | if (!io_should_wake(iowq, true)) | |
bda52162 JA |
7091 | return -1; |
7092 | ||
7093 | return autoremove_wake_function(curr, mode, wake_flags, key); | |
7094 | } | |
7095 | ||
af9c1a44 JA |
7096 | static int io_run_task_work_sig(void) |
7097 | { | |
7098 | if (io_run_task_work()) | |
7099 | return 1; | |
7100 | if (!signal_pending(current)) | |
7101 | return 0; | |
7102 | if (current->jobctl & JOBCTL_TASK_WORK) { | |
7103 | spin_lock_irq(¤t->sighand->siglock); | |
7104 | current->jobctl &= ~JOBCTL_TASK_WORK; | |
7105 | recalc_sigpending(); | |
7106 | spin_unlock_irq(¤t->sighand->siglock); | |
7107 | return 1; | |
7108 | } | |
7109 | return -EINTR; | |
7110 | } | |
7111 | ||
2b188cc1 JA |
7112 | /* |
7113 | * Wait until events become available, if we don't already have some. The | |
7114 | * application must reap them itself, as they reside on the shared cq ring. | |
7115 | */ | |
7116 | static int io_cqring_wait(struct io_ring_ctx *ctx, int min_events, | |
7117 | const sigset_t __user *sig, size_t sigsz) | |
7118 | { | |
bda52162 JA |
7119 | struct io_wait_queue iowq = { |
7120 | .wq = { | |
7121 | .private = current, | |
7122 | .func = io_wake_function, | |
7123 | .entry = LIST_HEAD_INIT(iowq.wq.entry), | |
7124 | }, | |
7125 | .ctx = ctx, | |
7126 | .to_wait = min_events, | |
7127 | }; | |
75b28aff | 7128 | struct io_rings *rings = ctx->rings; |
e9ffa5c2 | 7129 | int ret = 0; |
2b188cc1 | 7130 | |
b41e9852 JA |
7131 | do { |
7132 | if (io_cqring_events(ctx, false) >= min_events) | |
7133 | return 0; | |
4c6e277c | 7134 | if (!io_run_task_work()) |
b41e9852 | 7135 | break; |
b41e9852 | 7136 | } while (1); |
2b188cc1 JA |
7137 | |
7138 | if (sig) { | |
9e75ad5d AB |
7139 | #ifdef CONFIG_COMPAT |
7140 | if (in_compat_syscall()) | |
7141 | ret = set_compat_user_sigmask((const compat_sigset_t __user *)sig, | |
b772434b | 7142 | sigsz); |
9e75ad5d AB |
7143 | else |
7144 | #endif | |
b772434b | 7145 | ret = set_user_sigmask(sig, sigsz); |
9e75ad5d | 7146 | |
2b188cc1 JA |
7147 | if (ret) |
7148 | return ret; | |
7149 | } | |
7150 | ||
bda52162 | 7151 | iowq.nr_timeouts = atomic_read(&ctx->cq_timeouts); |
c826bd7a | 7152 | trace_io_uring_cqring_wait(ctx, min_events); |
bda52162 JA |
7153 | do { |
7154 | prepare_to_wait_exclusive(&ctx->wait, &iowq.wq, | |
7155 | TASK_INTERRUPTIBLE); | |
ce593a6c | 7156 | /* make sure we run task_work before checking for signals */ |
af9c1a44 JA |
7157 | ret = io_run_task_work_sig(); |
7158 | if (ret > 0) | |
4c6e277c | 7159 | continue; |
af9c1a44 | 7160 | else if (ret < 0) |
bda52162 | 7161 | break; |
ce593a6c JA |
7162 | if (io_should_wake(&iowq, false)) |
7163 | break; | |
7164 | schedule(); | |
bda52162 JA |
7165 | } while (1); |
7166 | finish_wait(&ctx->wait, &iowq.wq); | |
7167 | ||
b7db41c9 | 7168 | restore_saved_sigmask_unless(ret == -EINTR); |
2b188cc1 | 7169 | |
75b28aff | 7170 | return READ_ONCE(rings->cq.head) == READ_ONCE(rings->cq.tail) ? ret : 0; |
2b188cc1 JA |
7171 | } |
7172 | ||
6b06314c JA |
7173 | static void __io_sqe_files_unregister(struct io_ring_ctx *ctx) |
7174 | { | |
7175 | #if defined(CONFIG_UNIX) | |
7176 | if (ctx->ring_sock) { | |
7177 | struct sock *sock = ctx->ring_sock->sk; | |
7178 | struct sk_buff *skb; | |
7179 | ||
7180 | while ((skb = skb_dequeue(&sock->sk_receive_queue)) != NULL) | |
7181 | kfree_skb(skb); | |
7182 | } | |
7183 | #else | |
7184 | int i; | |
7185 | ||
65e19f54 JA |
7186 | for (i = 0; i < ctx->nr_user_files; i++) { |
7187 | struct file *file; | |
7188 | ||
7189 | file = io_file_from_index(ctx, i); | |
7190 | if (file) | |
7191 | fput(file); | |
7192 | } | |
6b06314c JA |
7193 | #endif |
7194 | } | |
7195 | ||
05f3fb3c JA |
7196 | static void io_file_ref_kill(struct percpu_ref *ref) |
7197 | { | |
7198 | struct fixed_file_data *data; | |
7199 | ||
7200 | data = container_of(ref, struct fixed_file_data, refs); | |
7201 | complete(&data->done); | |
7202 | } | |
7203 | ||
6b06314c JA |
7204 | static int io_sqe_files_unregister(struct io_ring_ctx *ctx) |
7205 | { | |
05f3fb3c | 7206 | struct fixed_file_data *data = ctx->file_data; |
05589553 | 7207 | struct fixed_file_ref_node *ref_node = NULL; |
65e19f54 JA |
7208 | unsigned nr_tables, i; |
7209 | ||
05f3fb3c | 7210 | if (!data) |
6b06314c JA |
7211 | return -ENXIO; |
7212 | ||
6a4d07cd | 7213 | spin_lock(&data->lock); |
1e5d770b | 7214 | ref_node = data->node; |
6a4d07cd | 7215 | spin_unlock(&data->lock); |
05589553 XW |
7216 | if (ref_node) |
7217 | percpu_ref_kill(&ref_node->refs); | |
7218 | ||
7219 | percpu_ref_kill(&data->refs); | |
7220 | ||
7221 | /* wait for all refs nodes to complete */ | |
4a38aed2 | 7222 | flush_delayed_work(&ctx->file_put_work); |
2faf852d | 7223 | wait_for_completion(&data->done); |
05f3fb3c | 7224 | |
6b06314c | 7225 | __io_sqe_files_unregister(ctx); |
65e19f54 JA |
7226 | nr_tables = DIV_ROUND_UP(ctx->nr_user_files, IORING_MAX_FILES_TABLE); |
7227 | for (i = 0; i < nr_tables; i++) | |
05f3fb3c JA |
7228 | kfree(data->table[i].files); |
7229 | kfree(data->table); | |
05589553 XW |
7230 | percpu_ref_exit(&data->refs); |
7231 | kfree(data); | |
05f3fb3c | 7232 | ctx->file_data = NULL; |
6b06314c JA |
7233 | ctx->nr_user_files = 0; |
7234 | return 0; | |
7235 | } | |
7236 | ||
534ca6d6 | 7237 | static void io_put_sq_data(struct io_sq_data *sqd) |
6c271ce2 | 7238 | { |
534ca6d6 | 7239 | if (refcount_dec_and_test(&sqd->refs)) { |
2bbcd6d3 RP |
7240 | /* |
7241 | * The park is a bit of a work-around, without it we get | |
7242 | * warning spews on shutdown with SQPOLL set and affinity | |
7243 | * set to a single CPU. | |
7244 | */ | |
534ca6d6 JA |
7245 | if (sqd->thread) { |
7246 | kthread_park(sqd->thread); | |
7247 | kthread_stop(sqd->thread); | |
7248 | } | |
7249 | ||
7250 | kfree(sqd); | |
7251 | } | |
7252 | } | |
7253 | ||
aa06165d JA |
7254 | static struct io_sq_data *io_attach_sq_data(struct io_uring_params *p) |
7255 | { | |
7256 | struct io_ring_ctx *ctx_attach; | |
7257 | struct io_sq_data *sqd; | |
7258 | struct fd f; | |
7259 | ||
7260 | f = fdget(p->wq_fd); | |
7261 | if (!f.file) | |
7262 | return ERR_PTR(-ENXIO); | |
7263 | if (f.file->f_op != &io_uring_fops) { | |
7264 | fdput(f); | |
7265 | return ERR_PTR(-EINVAL); | |
7266 | } | |
7267 | ||
7268 | ctx_attach = f.file->private_data; | |
7269 | sqd = ctx_attach->sq_data; | |
7270 | if (!sqd) { | |
7271 | fdput(f); | |
7272 | return ERR_PTR(-EINVAL); | |
7273 | } | |
7274 | ||
7275 | refcount_inc(&sqd->refs); | |
7276 | fdput(f); | |
7277 | return sqd; | |
7278 | } | |
7279 | ||
534ca6d6 JA |
7280 | static struct io_sq_data *io_get_sq_data(struct io_uring_params *p) |
7281 | { | |
7282 | struct io_sq_data *sqd; | |
7283 | ||
aa06165d JA |
7284 | if (p->flags & IORING_SETUP_ATTACH_WQ) |
7285 | return io_attach_sq_data(p); | |
7286 | ||
534ca6d6 JA |
7287 | sqd = kzalloc(sizeof(*sqd), GFP_KERNEL); |
7288 | if (!sqd) | |
7289 | return ERR_PTR(-ENOMEM); | |
7290 | ||
7291 | refcount_set(&sqd->refs, 1); | |
69fb2131 JA |
7292 | INIT_LIST_HEAD(&sqd->ctx_list); |
7293 | INIT_LIST_HEAD(&sqd->ctx_new_list); | |
7294 | mutex_init(&sqd->ctx_lock); | |
7295 | mutex_init(&sqd->lock); | |
534ca6d6 JA |
7296 | init_waitqueue_head(&sqd->wait); |
7297 | return sqd; | |
7298 | } | |
7299 | ||
69fb2131 JA |
7300 | static void io_sq_thread_unpark(struct io_sq_data *sqd) |
7301 | __releases(&sqd->lock) | |
7302 | { | |
7303 | if (!sqd->thread) | |
7304 | return; | |
7305 | kthread_unpark(sqd->thread); | |
7306 | mutex_unlock(&sqd->lock); | |
7307 | } | |
7308 | ||
7309 | static void io_sq_thread_park(struct io_sq_data *sqd) | |
7310 | __acquires(&sqd->lock) | |
7311 | { | |
7312 | if (!sqd->thread) | |
7313 | return; | |
7314 | mutex_lock(&sqd->lock); | |
7315 | kthread_park(sqd->thread); | |
7316 | } | |
7317 | ||
534ca6d6 JA |
7318 | static void io_sq_thread_stop(struct io_ring_ctx *ctx) |
7319 | { | |
7320 | struct io_sq_data *sqd = ctx->sq_data; | |
7321 | ||
7322 | if (sqd) { | |
7323 | if (sqd->thread) { | |
7324 | /* | |
7325 | * We may arrive here from the error branch in | |
7326 | * io_sq_offload_create() where the kthread is created | |
7327 | * without being waked up, thus wake it up now to make | |
7328 | * sure the wait will complete. | |
7329 | */ | |
7330 | wake_up_process(sqd->thread); | |
7331 | wait_for_completion(&ctx->sq_thread_comp); | |
69fb2131 JA |
7332 | |
7333 | io_sq_thread_park(sqd); | |
7334 | } | |
7335 | ||
7336 | mutex_lock(&sqd->ctx_lock); | |
7337 | list_del(&ctx->sqd_list); | |
7338 | mutex_unlock(&sqd->ctx_lock); | |
7339 | ||
7340 | if (sqd->thread) { | |
7341 | finish_wait(&sqd->wait, &ctx->sqo_wait_entry); | |
7342 | io_sq_thread_unpark(sqd); | |
534ca6d6 JA |
7343 | } |
7344 | ||
7345 | io_put_sq_data(sqd); | |
7346 | ctx->sq_data = NULL; | |
6c271ce2 JA |
7347 | } |
7348 | } | |
7349 | ||
6b06314c JA |
7350 | static void io_finish_async(struct io_ring_ctx *ctx) |
7351 | { | |
6c271ce2 JA |
7352 | io_sq_thread_stop(ctx); |
7353 | ||
561fb04a JA |
7354 | if (ctx->io_wq) { |
7355 | io_wq_destroy(ctx->io_wq); | |
7356 | ctx->io_wq = NULL; | |
6b06314c JA |
7357 | } |
7358 | } | |
7359 | ||
7360 | #if defined(CONFIG_UNIX) | |
6b06314c JA |
7361 | /* |
7362 | * Ensure the UNIX gc is aware of our file set, so we are certain that | |
7363 | * the io_uring can be safely unregistered on process exit, even if we have | |
7364 | * loops in the file referencing. | |
7365 | */ | |
7366 | static int __io_sqe_files_scm(struct io_ring_ctx *ctx, int nr, int offset) | |
7367 | { | |
7368 | struct sock *sk = ctx->ring_sock->sk; | |
7369 | struct scm_fp_list *fpl; | |
7370 | struct sk_buff *skb; | |
08a45173 | 7371 | int i, nr_files; |
6b06314c | 7372 | |
6b06314c JA |
7373 | fpl = kzalloc(sizeof(*fpl), GFP_KERNEL); |
7374 | if (!fpl) | |
7375 | return -ENOMEM; | |
7376 | ||
7377 | skb = alloc_skb(0, GFP_KERNEL); | |
7378 | if (!skb) { | |
7379 | kfree(fpl); | |
7380 | return -ENOMEM; | |
7381 | } | |
7382 | ||
7383 | skb->sk = sk; | |
6b06314c | 7384 | |
08a45173 | 7385 | nr_files = 0; |
6b06314c JA |
7386 | fpl->user = get_uid(ctx->user); |
7387 | for (i = 0; i < nr; i++) { | |
65e19f54 JA |
7388 | struct file *file = io_file_from_index(ctx, i + offset); |
7389 | ||
7390 | if (!file) | |
08a45173 | 7391 | continue; |
65e19f54 | 7392 | fpl->fp[nr_files] = get_file(file); |
08a45173 JA |
7393 | unix_inflight(fpl->user, fpl->fp[nr_files]); |
7394 | nr_files++; | |
6b06314c JA |
7395 | } |
7396 | ||
08a45173 JA |
7397 | if (nr_files) { |
7398 | fpl->max = SCM_MAX_FD; | |
7399 | fpl->count = nr_files; | |
7400 | UNIXCB(skb).fp = fpl; | |
05f3fb3c | 7401 | skb->destructor = unix_destruct_scm; |
08a45173 JA |
7402 | refcount_add(skb->truesize, &sk->sk_wmem_alloc); |
7403 | skb_queue_head(&sk->sk_receive_queue, skb); | |
6b06314c | 7404 | |
08a45173 JA |
7405 | for (i = 0; i < nr_files; i++) |
7406 | fput(fpl->fp[i]); | |
7407 | } else { | |
7408 | kfree_skb(skb); | |
7409 | kfree(fpl); | |
7410 | } | |
6b06314c JA |
7411 | |
7412 | return 0; | |
7413 | } | |
7414 | ||
7415 | /* | |
7416 | * If UNIX sockets are enabled, fd passing can cause a reference cycle which | |
7417 | * causes regular reference counting to break down. We rely on the UNIX | |
7418 | * garbage collection to take care of this problem for us. | |
7419 | */ | |
7420 | static int io_sqe_files_scm(struct io_ring_ctx *ctx) | |
7421 | { | |
7422 | unsigned left, total; | |
7423 | int ret = 0; | |
7424 | ||
7425 | total = 0; | |
7426 | left = ctx->nr_user_files; | |
7427 | while (left) { | |
7428 | unsigned this_files = min_t(unsigned, left, SCM_MAX_FD); | |
6b06314c JA |
7429 | |
7430 | ret = __io_sqe_files_scm(ctx, this_files, total); | |
7431 | if (ret) | |
7432 | break; | |
7433 | left -= this_files; | |
7434 | total += this_files; | |
7435 | } | |
7436 | ||
7437 | if (!ret) | |
7438 | return 0; | |
7439 | ||
7440 | while (total < ctx->nr_user_files) { | |
65e19f54 JA |
7441 | struct file *file = io_file_from_index(ctx, total); |
7442 | ||
7443 | if (file) | |
7444 | fput(file); | |
6b06314c JA |
7445 | total++; |
7446 | } | |
7447 | ||
7448 | return ret; | |
7449 | } | |
7450 | #else | |
7451 | static int io_sqe_files_scm(struct io_ring_ctx *ctx) | |
7452 | { | |
7453 | return 0; | |
7454 | } | |
7455 | #endif | |
7456 | ||
5398ae69 PB |
7457 | static int io_sqe_alloc_file_tables(struct fixed_file_data *file_data, |
7458 | unsigned nr_tables, unsigned nr_files) | |
65e19f54 JA |
7459 | { |
7460 | int i; | |
7461 | ||
7462 | for (i = 0; i < nr_tables; i++) { | |
5398ae69 | 7463 | struct fixed_file_table *table = &file_data->table[i]; |
65e19f54 JA |
7464 | unsigned this_files; |
7465 | ||
7466 | this_files = min(nr_files, IORING_MAX_FILES_TABLE); | |
7467 | table->files = kcalloc(this_files, sizeof(struct file *), | |
7468 | GFP_KERNEL); | |
7469 | if (!table->files) | |
7470 | break; | |
7471 | nr_files -= this_files; | |
7472 | } | |
7473 | ||
7474 | if (i == nr_tables) | |
7475 | return 0; | |
7476 | ||
7477 | for (i = 0; i < nr_tables; i++) { | |
5398ae69 | 7478 | struct fixed_file_table *table = &file_data->table[i]; |
65e19f54 JA |
7479 | kfree(table->files); |
7480 | } | |
7481 | return 1; | |
7482 | } | |
7483 | ||
05f3fb3c JA |
7484 | static void io_ring_file_put(struct io_ring_ctx *ctx, struct file *file) |
7485 | { | |
7486 | #if defined(CONFIG_UNIX) | |
7487 | struct sock *sock = ctx->ring_sock->sk; | |
7488 | struct sk_buff_head list, *head = &sock->sk_receive_queue; | |
7489 | struct sk_buff *skb; | |
7490 | int i; | |
7491 | ||
7492 | __skb_queue_head_init(&list); | |
7493 | ||
7494 | /* | |
7495 | * Find the skb that holds this file in its SCM_RIGHTS. When found, | |
7496 | * remove this entry and rearrange the file array. | |
7497 | */ | |
7498 | skb = skb_dequeue(head); | |
7499 | while (skb) { | |
7500 | struct scm_fp_list *fp; | |
7501 | ||
7502 | fp = UNIXCB(skb).fp; | |
7503 | for (i = 0; i < fp->count; i++) { | |
7504 | int left; | |
7505 | ||
7506 | if (fp->fp[i] != file) | |
7507 | continue; | |
7508 | ||
7509 | unix_notinflight(fp->user, fp->fp[i]); | |
7510 | left = fp->count - 1 - i; | |
7511 | if (left) { | |
7512 | memmove(&fp->fp[i], &fp->fp[i + 1], | |
7513 | left * sizeof(struct file *)); | |
7514 | } | |
7515 | fp->count--; | |
7516 | if (!fp->count) { | |
7517 | kfree_skb(skb); | |
7518 | skb = NULL; | |
7519 | } else { | |
7520 | __skb_queue_tail(&list, skb); | |
7521 | } | |
7522 | fput(file); | |
7523 | file = NULL; | |
7524 | break; | |
7525 | } | |
7526 | ||
7527 | if (!file) | |
7528 | break; | |
7529 | ||
7530 | __skb_queue_tail(&list, skb); | |
7531 | ||
7532 | skb = skb_dequeue(head); | |
7533 | } | |
7534 | ||
7535 | if (skb_peek(&list)) { | |
7536 | spin_lock_irq(&head->lock); | |
7537 | while ((skb = __skb_dequeue(&list)) != NULL) | |
7538 | __skb_queue_tail(head, skb); | |
7539 | spin_unlock_irq(&head->lock); | |
7540 | } | |
7541 | #else | |
7542 | fput(file); | |
7543 | #endif | |
7544 | } | |
7545 | ||
7546 | struct io_file_put { | |
05589553 | 7547 | struct list_head list; |
05f3fb3c | 7548 | struct file *file; |
05f3fb3c JA |
7549 | }; |
7550 | ||
4a38aed2 | 7551 | static void __io_file_put_work(struct fixed_file_ref_node *ref_node) |
65e19f54 | 7552 | { |
4a38aed2 JA |
7553 | struct fixed_file_data *file_data = ref_node->file_data; |
7554 | struct io_ring_ctx *ctx = file_data->ctx; | |
05f3fb3c | 7555 | struct io_file_put *pfile, *tmp; |
05589553 XW |
7556 | |
7557 | list_for_each_entry_safe(pfile, tmp, &ref_node->file_list, list) { | |
6a4d07cd | 7558 | list_del(&pfile->list); |
05589553 XW |
7559 | io_ring_file_put(ctx, pfile->file); |
7560 | kfree(pfile); | |
65e19f54 | 7561 | } |
05589553 | 7562 | |
05589553 XW |
7563 | percpu_ref_exit(&ref_node->refs); |
7564 | kfree(ref_node); | |
7565 | percpu_ref_put(&file_data->refs); | |
2faf852d | 7566 | } |
65e19f54 | 7567 | |
4a38aed2 JA |
7568 | static void io_file_put_work(struct work_struct *work) |
7569 | { | |
7570 | struct io_ring_ctx *ctx; | |
7571 | struct llist_node *node; | |
7572 | ||
7573 | ctx = container_of(work, struct io_ring_ctx, file_put_work.work); | |
7574 | node = llist_del_all(&ctx->file_put_llist); | |
7575 | ||
7576 | while (node) { | |
7577 | struct fixed_file_ref_node *ref_node; | |
7578 | struct llist_node *next = node->next; | |
7579 | ||
7580 | ref_node = llist_entry(node, struct fixed_file_ref_node, llist); | |
7581 | __io_file_put_work(ref_node); | |
7582 | node = next; | |
7583 | } | |
7584 | } | |
7585 | ||
05589553 | 7586 | static void io_file_data_ref_zero(struct percpu_ref *ref) |
2faf852d | 7587 | { |
05589553 | 7588 | struct fixed_file_ref_node *ref_node; |
e297822b | 7589 | struct fixed_file_data *data; |
4a38aed2 | 7590 | struct io_ring_ctx *ctx; |
e297822b | 7591 | bool first_add = false; |
4a38aed2 | 7592 | int delay = HZ; |
65e19f54 | 7593 | |
05589553 | 7594 | ref_node = container_of(ref, struct fixed_file_ref_node, refs); |
e297822b PB |
7595 | data = ref_node->file_data; |
7596 | ctx = data->ctx; | |
7597 | ||
7598 | spin_lock(&data->lock); | |
7599 | ref_node->done = true; | |
7600 | ||
7601 | while (!list_empty(&data->ref_list)) { | |
7602 | ref_node = list_first_entry(&data->ref_list, | |
7603 | struct fixed_file_ref_node, node); | |
7604 | /* recycle ref nodes in order */ | |
7605 | if (!ref_node->done) | |
7606 | break; | |
7607 | list_del(&ref_node->node); | |
7608 | first_add |= llist_add(&ref_node->llist, &ctx->file_put_llist); | |
7609 | } | |
7610 | spin_unlock(&data->lock); | |
05589553 | 7611 | |
e297822b | 7612 | if (percpu_ref_is_dying(&data->refs)) |
4a38aed2 | 7613 | delay = 0; |
05589553 | 7614 | |
4a38aed2 JA |
7615 | if (!delay) |
7616 | mod_delayed_work(system_wq, &ctx->file_put_work, 0); | |
7617 | else if (first_add) | |
7618 | queue_delayed_work(system_wq, &ctx->file_put_work, delay); | |
05f3fb3c | 7619 | } |
65e19f54 | 7620 | |
05589553 XW |
7621 | static struct fixed_file_ref_node *alloc_fixed_file_ref_node( |
7622 | struct io_ring_ctx *ctx) | |
05f3fb3c | 7623 | { |
05589553 | 7624 | struct fixed_file_ref_node *ref_node; |
05f3fb3c | 7625 | |
05589553 XW |
7626 | ref_node = kzalloc(sizeof(*ref_node), GFP_KERNEL); |
7627 | if (!ref_node) | |
7628 | return ERR_PTR(-ENOMEM); | |
05f3fb3c | 7629 | |
05589553 XW |
7630 | if (percpu_ref_init(&ref_node->refs, io_file_data_ref_zero, |
7631 | 0, GFP_KERNEL)) { | |
7632 | kfree(ref_node); | |
7633 | return ERR_PTR(-ENOMEM); | |
7634 | } | |
7635 | INIT_LIST_HEAD(&ref_node->node); | |
7636 | INIT_LIST_HEAD(&ref_node->file_list); | |
05589553 | 7637 | ref_node->file_data = ctx->file_data; |
e297822b | 7638 | ref_node->done = false; |
05589553 | 7639 | return ref_node; |
05589553 XW |
7640 | } |
7641 | ||
7642 | static void destroy_fixed_file_ref_node(struct fixed_file_ref_node *ref_node) | |
7643 | { | |
7644 | percpu_ref_exit(&ref_node->refs); | |
7645 | kfree(ref_node); | |
65e19f54 JA |
7646 | } |
7647 | ||
6b06314c JA |
7648 | static int io_sqe_files_register(struct io_ring_ctx *ctx, void __user *arg, |
7649 | unsigned nr_args) | |
7650 | { | |
7651 | __s32 __user *fds = (__s32 __user *) arg; | |
600cf3f8 | 7652 | unsigned nr_tables, i; |
05f3fb3c | 7653 | struct file *file; |
600cf3f8 | 7654 | int fd, ret = -ENOMEM; |
05589553 | 7655 | struct fixed_file_ref_node *ref_node; |
5398ae69 | 7656 | struct fixed_file_data *file_data; |
6b06314c | 7657 | |
05f3fb3c | 7658 | if (ctx->file_data) |
6b06314c JA |
7659 | return -EBUSY; |
7660 | if (!nr_args) | |
7661 | return -EINVAL; | |
7662 | if (nr_args > IORING_MAX_FIXED_FILES) | |
7663 | return -EMFILE; | |
7664 | ||
5398ae69 PB |
7665 | file_data = kzalloc(sizeof(*ctx->file_data), GFP_KERNEL); |
7666 | if (!file_data) | |
05f3fb3c | 7667 | return -ENOMEM; |
5398ae69 PB |
7668 | file_data->ctx = ctx; |
7669 | init_completion(&file_data->done); | |
7670 | INIT_LIST_HEAD(&file_data->ref_list); | |
7671 | spin_lock_init(&file_data->lock); | |
05f3fb3c | 7672 | |
65e19f54 | 7673 | nr_tables = DIV_ROUND_UP(nr_args, IORING_MAX_FILES_TABLE); |
035fbafc | 7674 | file_data->table = kcalloc(nr_tables, sizeof(*file_data->table), |
5398ae69 | 7675 | GFP_KERNEL); |
600cf3f8 PB |
7676 | if (!file_data->table) |
7677 | goto out_free; | |
05f3fb3c | 7678 | |
5398ae69 | 7679 | if (percpu_ref_init(&file_data->refs, io_file_ref_kill, |
600cf3f8 PB |
7680 | PERCPU_REF_ALLOW_REINIT, GFP_KERNEL)) |
7681 | goto out_free; | |
6b06314c | 7682 | |
600cf3f8 PB |
7683 | if (io_sqe_alloc_file_tables(file_data, nr_tables, nr_args)) |
7684 | goto out_ref; | |
55cbc256 | 7685 | ctx->file_data = file_data; |
65e19f54 | 7686 | |
08a45173 | 7687 | for (i = 0; i < nr_args; i++, ctx->nr_user_files++) { |
65e19f54 JA |
7688 | struct fixed_file_table *table; |
7689 | unsigned index; | |
7690 | ||
600cf3f8 PB |
7691 | if (copy_from_user(&fd, &fds[i], sizeof(fd))) { |
7692 | ret = -EFAULT; | |
7693 | goto out_fput; | |
7694 | } | |
08a45173 | 7695 | /* allow sparse sets */ |
600cf3f8 | 7696 | if (fd == -1) |
08a45173 | 7697 | continue; |
6b06314c | 7698 | |
05f3fb3c | 7699 | file = fget(fd); |
6b06314c | 7700 | ret = -EBADF; |
05f3fb3c | 7701 | if (!file) |
600cf3f8 | 7702 | goto out_fput; |
05f3fb3c | 7703 | |
6b06314c JA |
7704 | /* |
7705 | * Don't allow io_uring instances to be registered. If UNIX | |
7706 | * isn't enabled, then this causes a reference cycle and this | |
7707 | * instance can never get freed. If UNIX is enabled we'll | |
7708 | * handle it just fine, but there's still no point in allowing | |
7709 | * a ring fd as it doesn't support regular read/write anyway. | |
7710 | */ | |
05f3fb3c JA |
7711 | if (file->f_op == &io_uring_fops) { |
7712 | fput(file); | |
600cf3f8 | 7713 | goto out_fput; |
6b06314c | 7714 | } |
600cf3f8 PB |
7715 | table = &file_data->table[i >> IORING_FILE_TABLE_SHIFT]; |
7716 | index = i & IORING_FILE_TABLE_MASK; | |
05f3fb3c | 7717 | table->files[index] = file; |
6b06314c JA |
7718 | } |
7719 | ||
6b06314c | 7720 | ret = io_sqe_files_scm(ctx); |
05589553 | 7721 | if (ret) { |
6b06314c | 7722 | io_sqe_files_unregister(ctx); |
05589553 XW |
7723 | return ret; |
7724 | } | |
6b06314c | 7725 | |
05589553 XW |
7726 | ref_node = alloc_fixed_file_ref_node(ctx); |
7727 | if (IS_ERR(ref_node)) { | |
7728 | io_sqe_files_unregister(ctx); | |
7729 | return PTR_ERR(ref_node); | |
7730 | } | |
7731 | ||
b2e96852 | 7732 | file_data->node = ref_node; |
5398ae69 | 7733 | spin_lock(&file_data->lock); |
e297822b | 7734 | list_add_tail(&ref_node->node, &file_data->ref_list); |
5398ae69 PB |
7735 | spin_unlock(&file_data->lock); |
7736 | percpu_ref_get(&file_data->refs); | |
6b06314c | 7737 | return ret; |
600cf3f8 PB |
7738 | out_fput: |
7739 | for (i = 0; i < ctx->nr_user_files; i++) { | |
7740 | file = io_file_from_index(ctx, i); | |
7741 | if (file) | |
7742 | fput(file); | |
7743 | } | |
7744 | for (i = 0; i < nr_tables; i++) | |
7745 | kfree(file_data->table[i].files); | |
7746 | ctx->nr_user_files = 0; | |
7747 | out_ref: | |
7748 | percpu_ref_exit(&file_data->refs); | |
7749 | out_free: | |
7750 | kfree(file_data->table); | |
7751 | kfree(file_data); | |
55cbc256 | 7752 | ctx->file_data = NULL; |
6b06314c JA |
7753 | return ret; |
7754 | } | |
7755 | ||
c3a31e60 JA |
7756 | static int io_sqe_file_register(struct io_ring_ctx *ctx, struct file *file, |
7757 | int index) | |
7758 | { | |
7759 | #if defined(CONFIG_UNIX) | |
7760 | struct sock *sock = ctx->ring_sock->sk; | |
7761 | struct sk_buff_head *head = &sock->sk_receive_queue; | |
7762 | struct sk_buff *skb; | |
7763 | ||
7764 | /* | |
7765 | * See if we can merge this file into an existing skb SCM_RIGHTS | |
7766 | * file set. If there's no room, fall back to allocating a new skb | |
7767 | * and filling it in. | |
7768 | */ | |
7769 | spin_lock_irq(&head->lock); | |
7770 | skb = skb_peek(head); | |
7771 | if (skb) { | |
7772 | struct scm_fp_list *fpl = UNIXCB(skb).fp; | |
7773 | ||
7774 | if (fpl->count < SCM_MAX_FD) { | |
7775 | __skb_unlink(skb, head); | |
7776 | spin_unlock_irq(&head->lock); | |
7777 | fpl->fp[fpl->count] = get_file(file); | |
7778 | unix_inflight(fpl->user, fpl->fp[fpl->count]); | |
7779 | fpl->count++; | |
7780 | spin_lock_irq(&head->lock); | |
7781 | __skb_queue_head(head, skb); | |
7782 | } else { | |
7783 | skb = NULL; | |
7784 | } | |
7785 | } | |
7786 | spin_unlock_irq(&head->lock); | |
7787 | ||
7788 | if (skb) { | |
7789 | fput(file); | |
7790 | return 0; | |
7791 | } | |
7792 | ||
7793 | return __io_sqe_files_scm(ctx, 1, index); | |
7794 | #else | |
7795 | return 0; | |
7796 | #endif | |
7797 | } | |
7798 | ||
a5318d3c | 7799 | static int io_queue_file_removal(struct fixed_file_data *data, |
05589553 | 7800 | struct file *file) |
05f3fb3c | 7801 | { |
a5318d3c | 7802 | struct io_file_put *pfile; |
b2e96852 | 7803 | struct fixed_file_ref_node *ref_node = data->node; |
05f3fb3c | 7804 | |
05f3fb3c | 7805 | pfile = kzalloc(sizeof(*pfile), GFP_KERNEL); |
a5318d3c HD |
7806 | if (!pfile) |
7807 | return -ENOMEM; | |
05f3fb3c JA |
7808 | |
7809 | pfile->file = file; | |
05589553 XW |
7810 | list_add(&pfile->list, &ref_node->file_list); |
7811 | ||
a5318d3c | 7812 | return 0; |
05f3fb3c JA |
7813 | } |
7814 | ||
7815 | static int __io_sqe_files_update(struct io_ring_ctx *ctx, | |
7816 | struct io_uring_files_update *up, | |
7817 | unsigned nr_args) | |
7818 | { | |
7819 | struct fixed_file_data *data = ctx->file_data; | |
05589553 | 7820 | struct fixed_file_ref_node *ref_node; |
05f3fb3c | 7821 | struct file *file; |
c3a31e60 JA |
7822 | __s32 __user *fds; |
7823 | int fd, i, err; | |
7824 | __u32 done; | |
05589553 | 7825 | bool needs_switch = false; |
c3a31e60 | 7826 | |
05f3fb3c | 7827 | if (check_add_overflow(up->offset, nr_args, &done)) |
c3a31e60 JA |
7828 | return -EOVERFLOW; |
7829 | if (done > ctx->nr_user_files) | |
7830 | return -EINVAL; | |
7831 | ||
05589553 XW |
7832 | ref_node = alloc_fixed_file_ref_node(ctx); |
7833 | if (IS_ERR(ref_node)) | |
7834 | return PTR_ERR(ref_node); | |
7835 | ||
c3a31e60 | 7836 | done = 0; |
05f3fb3c | 7837 | fds = u64_to_user_ptr(up->fds); |
c3a31e60 | 7838 | while (nr_args) { |
65e19f54 JA |
7839 | struct fixed_file_table *table; |
7840 | unsigned index; | |
7841 | ||
c3a31e60 JA |
7842 | err = 0; |
7843 | if (copy_from_user(&fd, &fds[done], sizeof(fd))) { | |
7844 | err = -EFAULT; | |
7845 | break; | |
7846 | } | |
05f3fb3c JA |
7847 | i = array_index_nospec(up->offset, ctx->nr_user_files); |
7848 | table = &ctx->file_data->table[i >> IORING_FILE_TABLE_SHIFT]; | |
65e19f54 JA |
7849 | index = i & IORING_FILE_TABLE_MASK; |
7850 | if (table->files[index]) { | |
98dfd502 | 7851 | file = table->files[index]; |
a5318d3c HD |
7852 | err = io_queue_file_removal(data, file); |
7853 | if (err) | |
7854 | break; | |
65e19f54 | 7855 | table->files[index] = NULL; |
05589553 | 7856 | needs_switch = true; |
c3a31e60 JA |
7857 | } |
7858 | if (fd != -1) { | |
c3a31e60 JA |
7859 | file = fget(fd); |
7860 | if (!file) { | |
7861 | err = -EBADF; | |
7862 | break; | |
7863 | } | |
7864 | /* | |
7865 | * Don't allow io_uring instances to be registered. If | |
7866 | * UNIX isn't enabled, then this causes a reference | |
7867 | * cycle and this instance can never get freed. If UNIX | |
7868 | * is enabled we'll handle it just fine, but there's | |
7869 | * still no point in allowing a ring fd as it doesn't | |
7870 | * support regular read/write anyway. | |
7871 | */ | |
7872 | if (file->f_op == &io_uring_fops) { | |
7873 | fput(file); | |
7874 | err = -EBADF; | |
7875 | break; | |
7876 | } | |
65e19f54 | 7877 | table->files[index] = file; |
c3a31e60 | 7878 | err = io_sqe_file_register(ctx, file, i); |
f3bd9dae | 7879 | if (err) { |
95d1c8e5 | 7880 | table->files[index] = NULL; |
f3bd9dae | 7881 | fput(file); |
c3a31e60 | 7882 | break; |
f3bd9dae | 7883 | } |
c3a31e60 JA |
7884 | } |
7885 | nr_args--; | |
7886 | done++; | |
05f3fb3c JA |
7887 | up->offset++; |
7888 | } | |
7889 | ||
05589553 | 7890 | if (needs_switch) { |
b2e96852 | 7891 | percpu_ref_kill(&data->node->refs); |
6a4d07cd | 7892 | spin_lock(&data->lock); |
e297822b | 7893 | list_add_tail(&ref_node->node, &data->ref_list); |
b2e96852 | 7894 | data->node = ref_node; |
6a4d07cd | 7895 | spin_unlock(&data->lock); |
05589553 XW |
7896 | percpu_ref_get(&ctx->file_data->refs); |
7897 | } else | |
7898 | destroy_fixed_file_ref_node(ref_node); | |
c3a31e60 JA |
7899 | |
7900 | return done ? done : err; | |
7901 | } | |
05589553 | 7902 | |
05f3fb3c JA |
7903 | static int io_sqe_files_update(struct io_ring_ctx *ctx, void __user *arg, |
7904 | unsigned nr_args) | |
7905 | { | |
7906 | struct io_uring_files_update up; | |
7907 | ||
7908 | if (!ctx->file_data) | |
7909 | return -ENXIO; | |
7910 | if (!nr_args) | |
7911 | return -EINVAL; | |
7912 | if (copy_from_user(&up, arg, sizeof(up))) | |
7913 | return -EFAULT; | |
7914 | if (up.resv) | |
7915 | return -EINVAL; | |
7916 | ||
7917 | return __io_sqe_files_update(ctx, &up, nr_args); | |
7918 | } | |
c3a31e60 | 7919 | |
e9fd9396 | 7920 | static void io_free_work(struct io_wq_work *work) |
7d723065 JA |
7921 | { |
7922 | struct io_kiocb *req = container_of(work, struct io_kiocb, work); | |
7923 | ||
e9fd9396 | 7924 | /* Consider that io_steal_work() relies on this ref */ |
7d723065 JA |
7925 | io_put_req(req); |
7926 | } | |
7927 | ||
24369c2e PB |
7928 | static int io_init_wq_offload(struct io_ring_ctx *ctx, |
7929 | struct io_uring_params *p) | |
7930 | { | |
7931 | struct io_wq_data data; | |
7932 | struct fd f; | |
7933 | struct io_ring_ctx *ctx_attach; | |
7934 | unsigned int concurrency; | |
7935 | int ret = 0; | |
7936 | ||
7937 | data.user = ctx->user; | |
e9fd9396 | 7938 | data.free_work = io_free_work; |
f5fa38c5 | 7939 | data.do_work = io_wq_submit_work; |
24369c2e PB |
7940 | |
7941 | if (!(p->flags & IORING_SETUP_ATTACH_WQ)) { | |
7942 | /* Do QD, or 4 * CPUS, whatever is smallest */ | |
7943 | concurrency = min(ctx->sq_entries, 4 * num_online_cpus()); | |
7944 | ||
7945 | ctx->io_wq = io_wq_create(concurrency, &data); | |
7946 | if (IS_ERR(ctx->io_wq)) { | |
7947 | ret = PTR_ERR(ctx->io_wq); | |
7948 | ctx->io_wq = NULL; | |
7949 | } | |
7950 | return ret; | |
7951 | } | |
7952 | ||
7953 | f = fdget(p->wq_fd); | |
7954 | if (!f.file) | |
7955 | return -EBADF; | |
7956 | ||
7957 | if (f.file->f_op != &io_uring_fops) { | |
7958 | ret = -EINVAL; | |
7959 | goto out_fput; | |
7960 | } | |
7961 | ||
7962 | ctx_attach = f.file->private_data; | |
7963 | /* @io_wq is protected by holding the fd */ | |
7964 | if (!io_wq_get(ctx_attach->io_wq, &data)) { | |
7965 | ret = -EINVAL; | |
7966 | goto out_fput; | |
7967 | } | |
7968 | ||
7969 | ctx->io_wq = ctx_attach->io_wq; | |
7970 | out_fput: | |
7971 | fdput(f); | |
7972 | return ret; | |
7973 | } | |
7974 | ||
0f212204 JA |
7975 | static int io_uring_alloc_task_context(struct task_struct *task) |
7976 | { | |
7977 | struct io_uring_task *tctx; | |
d8a6df10 | 7978 | int ret; |
0f212204 JA |
7979 | |
7980 | tctx = kmalloc(sizeof(*tctx), GFP_KERNEL); | |
7981 | if (unlikely(!tctx)) | |
7982 | return -ENOMEM; | |
7983 | ||
d8a6df10 JA |
7984 | ret = percpu_counter_init(&tctx->inflight, 0, GFP_KERNEL); |
7985 | if (unlikely(ret)) { | |
7986 | kfree(tctx); | |
7987 | return ret; | |
7988 | } | |
7989 | ||
0f212204 JA |
7990 | xa_init(&tctx->xa); |
7991 | init_waitqueue_head(&tctx->wait); | |
7992 | tctx->last = NULL; | |
fdaf083c JA |
7993 | atomic_set(&tctx->in_idle, 0); |
7994 | tctx->sqpoll = false; | |
500a373d JA |
7995 | io_init_identity(&tctx->__identity); |
7996 | tctx->identity = &tctx->__identity; | |
0f212204 JA |
7997 | task->io_uring = tctx; |
7998 | return 0; | |
7999 | } | |
8000 | ||
8001 | void __io_uring_free(struct task_struct *tsk) | |
8002 | { | |
8003 | struct io_uring_task *tctx = tsk->io_uring; | |
8004 | ||
8005 | WARN_ON_ONCE(!xa_empty(&tctx->xa)); | |
500a373d JA |
8006 | WARN_ON_ONCE(refcount_read(&tctx->identity->count) != 1); |
8007 | if (tctx->identity != &tctx->__identity) | |
8008 | kfree(tctx->identity); | |
d8a6df10 | 8009 | percpu_counter_destroy(&tctx->inflight); |
0f212204 JA |
8010 | kfree(tctx); |
8011 | tsk->io_uring = NULL; | |
8012 | } | |
8013 | ||
7e84e1c7 SG |
8014 | static int io_sq_offload_create(struct io_ring_ctx *ctx, |
8015 | struct io_uring_params *p) | |
2b188cc1 JA |
8016 | { |
8017 | int ret; | |
8018 | ||
6c271ce2 | 8019 | if (ctx->flags & IORING_SETUP_SQPOLL) { |
534ca6d6 JA |
8020 | struct io_sq_data *sqd; |
8021 | ||
3ec482d1 | 8022 | ret = -EPERM; |
ce59fc69 | 8023 | if (!capable(CAP_SYS_ADMIN) && !capable(CAP_SYS_NICE)) |
3ec482d1 JA |
8024 | goto err; |
8025 | ||
534ca6d6 JA |
8026 | sqd = io_get_sq_data(p); |
8027 | if (IS_ERR(sqd)) { | |
8028 | ret = PTR_ERR(sqd); | |
8029 | goto err; | |
8030 | } | |
69fb2131 | 8031 | |
534ca6d6 | 8032 | ctx->sq_data = sqd; |
69fb2131 JA |
8033 | io_sq_thread_park(sqd); |
8034 | mutex_lock(&sqd->ctx_lock); | |
8035 | list_add(&ctx->sqd_list, &sqd->ctx_new_list); | |
8036 | mutex_unlock(&sqd->ctx_lock); | |
8037 | io_sq_thread_unpark(sqd); | |
534ca6d6 | 8038 | |
917257da JA |
8039 | ctx->sq_thread_idle = msecs_to_jiffies(p->sq_thread_idle); |
8040 | if (!ctx->sq_thread_idle) | |
8041 | ctx->sq_thread_idle = HZ; | |
8042 | ||
aa06165d JA |
8043 | if (sqd->thread) |
8044 | goto done; | |
8045 | ||
6c271ce2 | 8046 | if (p->flags & IORING_SETUP_SQ_AFF) { |
44a9bd18 | 8047 | int cpu = p->sq_thread_cpu; |
6c271ce2 | 8048 | |
917257da | 8049 | ret = -EINVAL; |
44a9bd18 JA |
8050 | if (cpu >= nr_cpu_ids) |
8051 | goto err; | |
7889f44d | 8052 | if (!cpu_online(cpu)) |
917257da JA |
8053 | goto err; |
8054 | ||
69fb2131 | 8055 | sqd->thread = kthread_create_on_cpu(io_sq_thread, sqd, |
534ca6d6 | 8056 | cpu, "io_uring-sq"); |
6c271ce2 | 8057 | } else { |
69fb2131 | 8058 | sqd->thread = kthread_create(io_sq_thread, sqd, |
6c271ce2 JA |
8059 | "io_uring-sq"); |
8060 | } | |
534ca6d6 JA |
8061 | if (IS_ERR(sqd->thread)) { |
8062 | ret = PTR_ERR(sqd->thread); | |
8063 | sqd->thread = NULL; | |
6c271ce2 JA |
8064 | goto err; |
8065 | } | |
534ca6d6 | 8066 | ret = io_uring_alloc_task_context(sqd->thread); |
0f212204 JA |
8067 | if (ret) |
8068 | goto err; | |
6c271ce2 JA |
8069 | } else if (p->flags & IORING_SETUP_SQ_AFF) { |
8070 | /* Can't have SQ_AFF without SQPOLL */ | |
8071 | ret = -EINVAL; | |
8072 | goto err; | |
8073 | } | |
8074 | ||
aa06165d | 8075 | done: |
24369c2e PB |
8076 | ret = io_init_wq_offload(ctx, p); |
8077 | if (ret) | |
2b188cc1 | 8078 | goto err; |
2b188cc1 JA |
8079 | |
8080 | return 0; | |
8081 | err: | |
54a91f3b | 8082 | io_finish_async(ctx); |
2b188cc1 JA |
8083 | return ret; |
8084 | } | |
8085 | ||
7e84e1c7 SG |
8086 | static void io_sq_offload_start(struct io_ring_ctx *ctx) |
8087 | { | |
534ca6d6 JA |
8088 | struct io_sq_data *sqd = ctx->sq_data; |
8089 | ||
8090 | if ((ctx->flags & IORING_SETUP_SQPOLL) && sqd->thread) | |
8091 | wake_up_process(sqd->thread); | |
7e84e1c7 SG |
8092 | } |
8093 | ||
a087e2b5 BM |
8094 | static inline void __io_unaccount_mem(struct user_struct *user, |
8095 | unsigned long nr_pages) | |
2b188cc1 JA |
8096 | { |
8097 | atomic_long_sub(nr_pages, &user->locked_vm); | |
8098 | } | |
8099 | ||
a087e2b5 BM |
8100 | static inline int __io_account_mem(struct user_struct *user, |
8101 | unsigned long nr_pages) | |
2b188cc1 JA |
8102 | { |
8103 | unsigned long page_limit, cur_pages, new_pages; | |
8104 | ||
8105 | /* Don't allow more pages than we can safely lock */ | |
8106 | page_limit = rlimit(RLIMIT_MEMLOCK) >> PAGE_SHIFT; | |
8107 | ||
8108 | do { | |
8109 | cur_pages = atomic_long_read(&user->locked_vm); | |
8110 | new_pages = cur_pages + nr_pages; | |
8111 | if (new_pages > page_limit) | |
8112 | return -ENOMEM; | |
8113 | } while (atomic_long_cmpxchg(&user->locked_vm, cur_pages, | |
8114 | new_pages) != cur_pages); | |
8115 | ||
8116 | return 0; | |
8117 | } | |
8118 | ||
2e0464d4 BM |
8119 | static void io_unaccount_mem(struct io_ring_ctx *ctx, unsigned long nr_pages, |
8120 | enum io_mem_account acct) | |
a087e2b5 | 8121 | { |
aad5d8da | 8122 | if (ctx->limit_mem) |
a087e2b5 | 8123 | __io_unaccount_mem(ctx->user, nr_pages); |
30975825 | 8124 | |
2aede0e4 | 8125 | if (ctx->mm_account) { |
2e0464d4 | 8126 | if (acct == ACCT_LOCKED) |
2aede0e4 | 8127 | ctx->mm_account->locked_vm -= nr_pages; |
2e0464d4 | 8128 | else if (acct == ACCT_PINNED) |
2aede0e4 | 8129 | atomic64_sub(nr_pages, &ctx->mm_account->pinned_vm); |
2e0464d4 | 8130 | } |
a087e2b5 BM |
8131 | } |
8132 | ||
2e0464d4 BM |
8133 | static int io_account_mem(struct io_ring_ctx *ctx, unsigned long nr_pages, |
8134 | enum io_mem_account acct) | |
a087e2b5 | 8135 | { |
30975825 BM |
8136 | int ret; |
8137 | ||
8138 | if (ctx->limit_mem) { | |
8139 | ret = __io_account_mem(ctx->user, nr_pages); | |
8140 | if (ret) | |
8141 | return ret; | |
8142 | } | |
8143 | ||
2aede0e4 | 8144 | if (ctx->mm_account) { |
2e0464d4 | 8145 | if (acct == ACCT_LOCKED) |
2aede0e4 | 8146 | ctx->mm_account->locked_vm += nr_pages; |
2e0464d4 | 8147 | else if (acct == ACCT_PINNED) |
2aede0e4 | 8148 | atomic64_add(nr_pages, &ctx->mm_account->pinned_vm); |
2e0464d4 | 8149 | } |
a087e2b5 BM |
8150 | |
8151 | return 0; | |
8152 | } | |
8153 | ||
2b188cc1 JA |
8154 | static void io_mem_free(void *ptr) |
8155 | { | |
52e04ef4 MR |
8156 | struct page *page; |
8157 | ||
8158 | if (!ptr) | |
8159 | return; | |
2b188cc1 | 8160 | |
52e04ef4 | 8161 | page = virt_to_head_page(ptr); |
2b188cc1 JA |
8162 | if (put_page_testzero(page)) |
8163 | free_compound_page(page); | |
8164 | } | |
8165 | ||
8166 | static void *io_mem_alloc(size_t size) | |
8167 | { | |
8168 | gfp_t gfp_flags = GFP_KERNEL | __GFP_ZERO | __GFP_NOWARN | __GFP_COMP | | |
8169 | __GFP_NORETRY; | |
8170 | ||
8171 | return (void *) __get_free_pages(gfp_flags, get_order(size)); | |
8172 | } | |
8173 | ||
75b28aff HV |
8174 | static unsigned long rings_size(unsigned sq_entries, unsigned cq_entries, |
8175 | size_t *sq_offset) | |
8176 | { | |
8177 | struct io_rings *rings; | |
8178 | size_t off, sq_array_size; | |
8179 | ||
8180 | off = struct_size(rings, cqes, cq_entries); | |
8181 | if (off == SIZE_MAX) | |
8182 | return SIZE_MAX; | |
8183 | ||
8184 | #ifdef CONFIG_SMP | |
8185 | off = ALIGN(off, SMP_CACHE_BYTES); | |
8186 | if (off == 0) | |
8187 | return SIZE_MAX; | |
8188 | #endif | |
8189 | ||
b36200f5 DV |
8190 | if (sq_offset) |
8191 | *sq_offset = off; | |
8192 | ||
75b28aff HV |
8193 | sq_array_size = array_size(sizeof(u32), sq_entries); |
8194 | if (sq_array_size == SIZE_MAX) | |
8195 | return SIZE_MAX; | |
8196 | ||
8197 | if (check_add_overflow(off, sq_array_size, &off)) | |
8198 | return SIZE_MAX; | |
8199 | ||
75b28aff HV |
8200 | return off; |
8201 | } | |
8202 | ||
2b188cc1 JA |
8203 | static unsigned long ring_pages(unsigned sq_entries, unsigned cq_entries) |
8204 | { | |
75b28aff | 8205 | size_t pages; |
2b188cc1 | 8206 | |
75b28aff HV |
8207 | pages = (size_t)1 << get_order( |
8208 | rings_size(sq_entries, cq_entries, NULL)); | |
8209 | pages += (size_t)1 << get_order( | |
8210 | array_size(sizeof(struct io_uring_sqe), sq_entries)); | |
2b188cc1 | 8211 | |
75b28aff | 8212 | return pages; |
2b188cc1 JA |
8213 | } |
8214 | ||
edafccee JA |
8215 | static int io_sqe_buffer_unregister(struct io_ring_ctx *ctx) |
8216 | { | |
8217 | int i, j; | |
8218 | ||
8219 | if (!ctx->user_bufs) | |
8220 | return -ENXIO; | |
8221 | ||
8222 | for (i = 0; i < ctx->nr_user_bufs; i++) { | |
8223 | struct io_mapped_ubuf *imu = &ctx->user_bufs[i]; | |
8224 | ||
8225 | for (j = 0; j < imu->nr_bvecs; j++) | |
f1f6a7dd | 8226 | unpin_user_page(imu->bvec[j].bv_page); |
edafccee | 8227 | |
de293938 JA |
8228 | if (imu->acct_pages) |
8229 | io_unaccount_mem(ctx, imu->acct_pages, ACCT_PINNED); | |
d4ef6475 | 8230 | kvfree(imu->bvec); |
edafccee JA |
8231 | imu->nr_bvecs = 0; |
8232 | } | |
8233 | ||
8234 | kfree(ctx->user_bufs); | |
8235 | ctx->user_bufs = NULL; | |
8236 | ctx->nr_user_bufs = 0; | |
8237 | return 0; | |
8238 | } | |
8239 | ||
8240 | static int io_copy_iov(struct io_ring_ctx *ctx, struct iovec *dst, | |
8241 | void __user *arg, unsigned index) | |
8242 | { | |
8243 | struct iovec __user *src; | |
8244 | ||
8245 | #ifdef CONFIG_COMPAT | |
8246 | if (ctx->compat) { | |
8247 | struct compat_iovec __user *ciovs; | |
8248 | struct compat_iovec ciov; | |
8249 | ||
8250 | ciovs = (struct compat_iovec __user *) arg; | |
8251 | if (copy_from_user(&ciov, &ciovs[index], sizeof(ciov))) | |
8252 | return -EFAULT; | |
8253 | ||
d55e5f5b | 8254 | dst->iov_base = u64_to_user_ptr((u64)ciov.iov_base); |
edafccee JA |
8255 | dst->iov_len = ciov.iov_len; |
8256 | return 0; | |
8257 | } | |
8258 | #endif | |
8259 | src = (struct iovec __user *) arg; | |
8260 | if (copy_from_user(dst, &src[index], sizeof(*dst))) | |
8261 | return -EFAULT; | |
8262 | return 0; | |
8263 | } | |
8264 | ||
de293938 JA |
8265 | /* |
8266 | * Not super efficient, but this is just a registration time. And we do cache | |
8267 | * the last compound head, so generally we'll only do a full search if we don't | |
8268 | * match that one. | |
8269 | * | |
8270 | * We check if the given compound head page has already been accounted, to | |
8271 | * avoid double accounting it. This allows us to account the full size of the | |
8272 | * page, not just the constituent pages of a huge page. | |
8273 | */ | |
8274 | static bool headpage_already_acct(struct io_ring_ctx *ctx, struct page **pages, | |
8275 | int nr_pages, struct page *hpage) | |
8276 | { | |
8277 | int i, j; | |
8278 | ||
8279 | /* check current page array */ | |
8280 | for (i = 0; i < nr_pages; i++) { | |
8281 | if (!PageCompound(pages[i])) | |
8282 | continue; | |
8283 | if (compound_head(pages[i]) == hpage) | |
8284 | return true; | |
8285 | } | |
8286 | ||
8287 | /* check previously registered pages */ | |
8288 | for (i = 0; i < ctx->nr_user_bufs; i++) { | |
8289 | struct io_mapped_ubuf *imu = &ctx->user_bufs[i]; | |
8290 | ||
8291 | for (j = 0; j < imu->nr_bvecs; j++) { | |
8292 | if (!PageCompound(imu->bvec[j].bv_page)) | |
8293 | continue; | |
8294 | if (compound_head(imu->bvec[j].bv_page) == hpage) | |
8295 | return true; | |
8296 | } | |
8297 | } | |
8298 | ||
8299 | return false; | |
8300 | } | |
8301 | ||
8302 | static int io_buffer_account_pin(struct io_ring_ctx *ctx, struct page **pages, | |
8303 | int nr_pages, struct io_mapped_ubuf *imu, | |
8304 | struct page **last_hpage) | |
8305 | { | |
8306 | int i, ret; | |
8307 | ||
8308 | for (i = 0; i < nr_pages; i++) { | |
8309 | if (!PageCompound(pages[i])) { | |
8310 | imu->acct_pages++; | |
8311 | } else { | |
8312 | struct page *hpage; | |
8313 | ||
8314 | hpage = compound_head(pages[i]); | |
8315 | if (hpage == *last_hpage) | |
8316 | continue; | |
8317 | *last_hpage = hpage; | |
8318 | if (headpage_already_acct(ctx, pages, i, hpage)) | |
8319 | continue; | |
8320 | imu->acct_pages += page_size(hpage) >> PAGE_SHIFT; | |
8321 | } | |
8322 | } | |
8323 | ||
8324 | if (!imu->acct_pages) | |
8325 | return 0; | |
8326 | ||
8327 | ret = io_account_mem(ctx, imu->acct_pages, ACCT_PINNED); | |
8328 | if (ret) | |
8329 | imu->acct_pages = 0; | |
8330 | return ret; | |
8331 | } | |
8332 | ||
edafccee JA |
8333 | static int io_sqe_buffer_register(struct io_ring_ctx *ctx, void __user *arg, |
8334 | unsigned nr_args) | |
8335 | { | |
8336 | struct vm_area_struct **vmas = NULL; | |
8337 | struct page **pages = NULL; | |
de293938 | 8338 | struct page *last_hpage = NULL; |
edafccee JA |
8339 | int i, j, got_pages = 0; |
8340 | int ret = -EINVAL; | |
8341 | ||
8342 | if (ctx->user_bufs) | |
8343 | return -EBUSY; | |
8344 | if (!nr_args || nr_args > UIO_MAXIOV) | |
8345 | return -EINVAL; | |
8346 | ||
8347 | ctx->user_bufs = kcalloc(nr_args, sizeof(struct io_mapped_ubuf), | |
8348 | GFP_KERNEL); | |
8349 | if (!ctx->user_bufs) | |
8350 | return -ENOMEM; | |
8351 | ||
8352 | for (i = 0; i < nr_args; i++) { | |
8353 | struct io_mapped_ubuf *imu = &ctx->user_bufs[i]; | |
8354 | unsigned long off, start, end, ubuf; | |
8355 | int pret, nr_pages; | |
8356 | struct iovec iov; | |
8357 | size_t size; | |
8358 | ||
8359 | ret = io_copy_iov(ctx, &iov, arg, i); | |
8360 | if (ret) | |
a278682d | 8361 | goto err; |
edafccee JA |
8362 | |
8363 | /* | |
8364 | * Don't impose further limits on the size and buffer | |
8365 | * constraints here, we'll -EINVAL later when IO is | |
8366 | * submitted if they are wrong. | |
8367 | */ | |
8368 | ret = -EFAULT; | |
8369 | if (!iov.iov_base || !iov.iov_len) | |
8370 | goto err; | |
8371 | ||
8372 | /* arbitrary limit, but we need something */ | |
8373 | if (iov.iov_len > SZ_1G) | |
8374 | goto err; | |
8375 | ||
8376 | ubuf = (unsigned long) iov.iov_base; | |
8377 | end = (ubuf + iov.iov_len + PAGE_SIZE - 1) >> PAGE_SHIFT; | |
8378 | start = ubuf >> PAGE_SHIFT; | |
8379 | nr_pages = end - start; | |
8380 | ||
edafccee JA |
8381 | ret = 0; |
8382 | if (!pages || nr_pages > got_pages) { | |
a8c73c1a DE |
8383 | kvfree(vmas); |
8384 | kvfree(pages); | |
d4ef6475 | 8385 | pages = kvmalloc_array(nr_pages, sizeof(struct page *), |
edafccee | 8386 | GFP_KERNEL); |
d4ef6475 | 8387 | vmas = kvmalloc_array(nr_pages, |
edafccee JA |
8388 | sizeof(struct vm_area_struct *), |
8389 | GFP_KERNEL); | |
8390 | if (!pages || !vmas) { | |
8391 | ret = -ENOMEM; | |
edafccee JA |
8392 | goto err; |
8393 | } | |
8394 | got_pages = nr_pages; | |
8395 | } | |
8396 | ||
d4ef6475 | 8397 | imu->bvec = kvmalloc_array(nr_pages, sizeof(struct bio_vec), |
edafccee JA |
8398 | GFP_KERNEL); |
8399 | ret = -ENOMEM; | |
de293938 | 8400 | if (!imu->bvec) |
edafccee | 8401 | goto err; |
edafccee JA |
8402 | |
8403 | ret = 0; | |
d8ed45c5 | 8404 | mmap_read_lock(current->mm); |
2113b05d | 8405 | pret = pin_user_pages(ubuf, nr_pages, |
932f4a63 IW |
8406 | FOLL_WRITE | FOLL_LONGTERM, |
8407 | pages, vmas); | |
edafccee JA |
8408 | if (pret == nr_pages) { |
8409 | /* don't support file backed memory */ | |
8410 | for (j = 0; j < nr_pages; j++) { | |
8411 | struct vm_area_struct *vma = vmas[j]; | |
8412 | ||
8413 | if (vma->vm_file && | |
8414 | !is_file_hugepages(vma->vm_file)) { | |
8415 | ret = -EOPNOTSUPP; | |
8416 | break; | |
8417 | } | |
8418 | } | |
8419 | } else { | |
8420 | ret = pret < 0 ? pret : -EFAULT; | |
8421 | } | |
d8ed45c5 | 8422 | mmap_read_unlock(current->mm); |
edafccee JA |
8423 | if (ret) { |
8424 | /* | |
8425 | * if we did partial map, or found file backed vmas, | |
8426 | * release any pages we did get | |
8427 | */ | |
27c4d3a3 | 8428 | if (pret > 0) |
f1f6a7dd | 8429 | unpin_user_pages(pages, pret); |
de293938 JA |
8430 | kvfree(imu->bvec); |
8431 | goto err; | |
8432 | } | |
8433 | ||
8434 | ret = io_buffer_account_pin(ctx, pages, pret, imu, &last_hpage); | |
8435 | if (ret) { | |
8436 | unpin_user_pages(pages, pret); | |
d4ef6475 | 8437 | kvfree(imu->bvec); |
edafccee JA |
8438 | goto err; |
8439 | } | |
8440 | ||
8441 | off = ubuf & ~PAGE_MASK; | |
8442 | size = iov.iov_len; | |
8443 | for (j = 0; j < nr_pages; j++) { | |
8444 | size_t vec_len; | |
8445 | ||
8446 | vec_len = min_t(size_t, size, PAGE_SIZE - off); | |
8447 | imu->bvec[j].bv_page = pages[j]; | |
8448 | imu->bvec[j].bv_len = vec_len; | |
8449 | imu->bvec[j].bv_offset = off; | |
8450 | off = 0; | |
8451 | size -= vec_len; | |
8452 | } | |
8453 | /* store original address for later verification */ | |
8454 | imu->ubuf = ubuf; | |
8455 | imu->len = iov.iov_len; | |
8456 | imu->nr_bvecs = nr_pages; | |
8457 | ||
8458 | ctx->nr_user_bufs++; | |
8459 | } | |
d4ef6475 MR |
8460 | kvfree(pages); |
8461 | kvfree(vmas); | |
edafccee JA |
8462 | return 0; |
8463 | err: | |
d4ef6475 MR |
8464 | kvfree(pages); |
8465 | kvfree(vmas); | |
edafccee JA |
8466 | io_sqe_buffer_unregister(ctx); |
8467 | return ret; | |
8468 | } | |
8469 | ||
9b402849 JA |
8470 | static int io_eventfd_register(struct io_ring_ctx *ctx, void __user *arg) |
8471 | { | |
8472 | __s32 __user *fds = arg; | |
8473 | int fd; | |
8474 | ||
8475 | if (ctx->cq_ev_fd) | |
8476 | return -EBUSY; | |
8477 | ||
8478 | if (copy_from_user(&fd, fds, sizeof(*fds))) | |
8479 | return -EFAULT; | |
8480 | ||
8481 | ctx->cq_ev_fd = eventfd_ctx_fdget(fd); | |
8482 | if (IS_ERR(ctx->cq_ev_fd)) { | |
8483 | int ret = PTR_ERR(ctx->cq_ev_fd); | |
8484 | ctx->cq_ev_fd = NULL; | |
8485 | return ret; | |
8486 | } | |
8487 | ||
8488 | return 0; | |
8489 | } | |
8490 | ||
8491 | static int io_eventfd_unregister(struct io_ring_ctx *ctx) | |
8492 | { | |
8493 | if (ctx->cq_ev_fd) { | |
8494 | eventfd_ctx_put(ctx->cq_ev_fd); | |
8495 | ctx->cq_ev_fd = NULL; | |
8496 | return 0; | |
8497 | } | |
8498 | ||
8499 | return -ENXIO; | |
8500 | } | |
8501 | ||
5a2e745d JA |
8502 | static int __io_destroy_buffers(int id, void *p, void *data) |
8503 | { | |
8504 | struct io_ring_ctx *ctx = data; | |
8505 | struct io_buffer *buf = p; | |
8506 | ||
067524e9 | 8507 | __io_remove_buffers(ctx, buf, id, -1U); |
5a2e745d JA |
8508 | return 0; |
8509 | } | |
8510 | ||
8511 | static void io_destroy_buffers(struct io_ring_ctx *ctx) | |
8512 | { | |
8513 | idr_for_each(&ctx->io_buffer_idr, __io_destroy_buffers, ctx); | |
8514 | idr_destroy(&ctx->io_buffer_idr); | |
8515 | } | |
8516 | ||
2b188cc1 JA |
8517 | static void io_ring_ctx_free(struct io_ring_ctx *ctx) |
8518 | { | |
6b06314c | 8519 | io_finish_async(ctx); |
5dbcad51 | 8520 | io_sqe_buffer_unregister(ctx); |
2aede0e4 JA |
8521 | |
8522 | if (ctx->sqo_task) { | |
8523 | put_task_struct(ctx->sqo_task); | |
8524 | ctx->sqo_task = NULL; | |
8525 | mmdrop(ctx->mm_account); | |
8526 | ctx->mm_account = NULL; | |
30975825 | 8527 | } |
def596e9 | 8528 | |
91d8f519 DZ |
8529 | #ifdef CONFIG_BLK_CGROUP |
8530 | if (ctx->sqo_blkcg_css) | |
8531 | css_put(ctx->sqo_blkcg_css); | |
8532 | #endif | |
8533 | ||
6b06314c | 8534 | io_sqe_files_unregister(ctx); |
9b402849 | 8535 | io_eventfd_unregister(ctx); |
5a2e745d | 8536 | io_destroy_buffers(ctx); |
41726c9a | 8537 | idr_destroy(&ctx->personality_idr); |
def596e9 | 8538 | |
2b188cc1 | 8539 | #if defined(CONFIG_UNIX) |
355e8d26 EB |
8540 | if (ctx->ring_sock) { |
8541 | ctx->ring_sock->file = NULL; /* so that iput() is called */ | |
2b188cc1 | 8542 | sock_release(ctx->ring_sock); |
355e8d26 | 8543 | } |
2b188cc1 JA |
8544 | #endif |
8545 | ||
75b28aff | 8546 | io_mem_free(ctx->rings); |
2b188cc1 | 8547 | io_mem_free(ctx->sq_sqes); |
2b188cc1 JA |
8548 | |
8549 | percpu_ref_exit(&ctx->refs); | |
2b188cc1 | 8550 | free_uid(ctx->user); |
181e448d | 8551 | put_cred(ctx->creds); |
78076bb6 | 8552 | kfree(ctx->cancel_hash); |
0ddf92e8 | 8553 | kmem_cache_free(req_cachep, ctx->fallback_req); |
2b188cc1 JA |
8554 | kfree(ctx); |
8555 | } | |
8556 | ||
8557 | static __poll_t io_uring_poll(struct file *file, poll_table *wait) | |
8558 | { | |
8559 | struct io_ring_ctx *ctx = file->private_data; | |
8560 | __poll_t mask = 0; | |
8561 | ||
8562 | poll_wait(file, &ctx->cq_wait, wait); | |
4f7067c3 SB |
8563 | /* |
8564 | * synchronizes with barrier from wq_has_sleeper call in | |
8565 | * io_commit_cqring | |
8566 | */ | |
2b188cc1 | 8567 | smp_rmb(); |
90554200 | 8568 | if (!io_sqring_full(ctx)) |
2b188cc1 | 8569 | mask |= EPOLLOUT | EPOLLWRNORM; |
63e5d81f | 8570 | if (io_cqring_events(ctx, false)) |
2b188cc1 JA |
8571 | mask |= EPOLLIN | EPOLLRDNORM; |
8572 | ||
8573 | return mask; | |
8574 | } | |
8575 | ||
8576 | static int io_uring_fasync(int fd, struct file *file, int on) | |
8577 | { | |
8578 | struct io_ring_ctx *ctx = file->private_data; | |
8579 | ||
8580 | return fasync_helper(fd, file, on, &ctx->cq_fasync); | |
8581 | } | |
8582 | ||
071698e1 JA |
8583 | static int io_remove_personalities(int id, void *p, void *data) |
8584 | { | |
8585 | struct io_ring_ctx *ctx = data; | |
1e6fa521 | 8586 | struct io_identity *iod; |
071698e1 | 8587 | |
1e6fa521 JA |
8588 | iod = idr_remove(&ctx->personality_idr, id); |
8589 | if (iod) { | |
8590 | put_cred(iod->creds); | |
8591 | if (refcount_dec_and_test(&iod->count)) | |
8592 | kfree(iod); | |
8593 | } | |
071698e1 JA |
8594 | return 0; |
8595 | } | |
8596 | ||
85faa7b8 JA |
8597 | static void io_ring_exit_work(struct work_struct *work) |
8598 | { | |
b2edc0a7 PB |
8599 | struct io_ring_ctx *ctx = container_of(work, struct io_ring_ctx, |
8600 | exit_work); | |
85faa7b8 | 8601 | |
56952e91 JA |
8602 | /* |
8603 | * If we're doing polled IO and end up having requests being | |
8604 | * submitted async (out-of-line), then completions can come in while | |
8605 | * we're waiting for refs to drop. We need to reap these manually, | |
8606 | * as nobody else will be looking for them. | |
8607 | */ | |
b2edc0a7 | 8608 | do { |
56952e91 | 8609 | if (ctx->rings) |
e6c8aa9a | 8610 | io_cqring_overflow_flush(ctx, true, NULL, NULL); |
b2edc0a7 PB |
8611 | io_iopoll_try_reap_events(ctx); |
8612 | } while (!wait_for_completion_timeout(&ctx->ref_comp, HZ/20)); | |
85faa7b8 JA |
8613 | io_ring_ctx_free(ctx); |
8614 | } | |
8615 | ||
2b188cc1 JA |
8616 | static void io_ring_ctx_wait_and_kill(struct io_ring_ctx *ctx) |
8617 | { | |
8618 | mutex_lock(&ctx->uring_lock); | |
8619 | percpu_ref_kill(&ctx->refs); | |
8620 | mutex_unlock(&ctx->uring_lock); | |
8621 | ||
f3606e3a JA |
8622 | io_kill_timeouts(ctx, NULL); |
8623 | io_poll_remove_all(ctx, NULL); | |
561fb04a JA |
8624 | |
8625 | if (ctx->io_wq) | |
8626 | io_wq_cancel_all(ctx->io_wq); | |
8627 | ||
15dff286 JA |
8628 | /* if we failed setting up the ctx, we might not have any rings */ |
8629 | if (ctx->rings) | |
e6c8aa9a | 8630 | io_cqring_overflow_flush(ctx, true, NULL, NULL); |
b2edc0a7 | 8631 | io_iopoll_try_reap_events(ctx); |
071698e1 | 8632 | idr_for_each(&ctx->personality_idr, io_remove_personalities, ctx); |
309fc03a JA |
8633 | |
8634 | /* | |
8635 | * Do this upfront, so we won't have a grace period where the ring | |
8636 | * is closed but resources aren't reaped yet. This can cause | |
8637 | * spurious failure in setting up a new ring. | |
8638 | */ | |
760618f7 JA |
8639 | io_unaccount_mem(ctx, ring_pages(ctx->sq_entries, ctx->cq_entries), |
8640 | ACCT_LOCKED); | |
309fc03a | 8641 | |
85faa7b8 | 8642 | INIT_WORK(&ctx->exit_work, io_ring_exit_work); |
fc666777 JA |
8643 | /* |
8644 | * Use system_unbound_wq to avoid spawning tons of event kworkers | |
8645 | * if we're exiting a ton of rings at the same time. It just adds | |
8646 | * noise and overhead, there's no discernable change in runtime | |
8647 | * over using system_wq. | |
8648 | */ | |
8649 | queue_work(system_unbound_wq, &ctx->exit_work); | |
2b188cc1 JA |
8650 | } |
8651 | ||
8652 | static int io_uring_release(struct inode *inode, struct file *file) | |
8653 | { | |
8654 | struct io_ring_ctx *ctx = file->private_data; | |
8655 | ||
8656 | file->private_data = NULL; | |
8657 | io_ring_ctx_wait_and_kill(ctx); | |
8658 | return 0; | |
8659 | } | |
8660 | ||
67c4d9e6 PB |
8661 | static bool io_wq_files_match(struct io_wq_work *work, void *data) |
8662 | { | |
8663 | struct files_struct *files = data; | |
8664 | ||
dfead8a8 | 8665 | return !files || ((work->flags & IO_WQ_WORK_FILES) && |
98447d65 | 8666 | work->identity->files == files); |
67c4d9e6 PB |
8667 | } |
8668 | ||
f254ac04 JA |
8669 | /* |
8670 | * Returns true if 'preq' is the link parent of 'req' | |
8671 | */ | |
8672 | static bool io_match_link(struct io_kiocb *preq, struct io_kiocb *req) | |
8673 | { | |
8674 | struct io_kiocb *link; | |
8675 | ||
8676 | if (!(preq->flags & REQ_F_LINK_HEAD)) | |
8677 | return false; | |
8678 | ||
8679 | list_for_each_entry(link, &preq->link_list, link_list) { | |
8680 | if (link == req) | |
8681 | return true; | |
8682 | } | |
8683 | ||
8684 | return false; | |
8685 | } | |
8686 | ||
8687 | /* | |
8688 | * We're looking to cancel 'req' because it's holding on to our files, but | |
8689 | * 'req' could be a link to another request. See if it is, and cancel that | |
8690 | * parent request if so. | |
8691 | */ | |
8692 | static bool io_poll_remove_link(struct io_ring_ctx *ctx, struct io_kiocb *req) | |
8693 | { | |
8694 | struct hlist_node *tmp; | |
8695 | struct io_kiocb *preq; | |
8696 | bool found = false; | |
8697 | int i; | |
8698 | ||
8699 | spin_lock_irq(&ctx->completion_lock); | |
8700 | for (i = 0; i < (1U << ctx->cancel_hash_bits); i++) { | |
8701 | struct hlist_head *list; | |
8702 | ||
8703 | list = &ctx->cancel_hash[i]; | |
8704 | hlist_for_each_entry_safe(preq, tmp, list, hash_node) { | |
8705 | found = io_match_link(preq, req); | |
8706 | if (found) { | |
8707 | io_poll_remove_one(preq); | |
8708 | break; | |
8709 | } | |
8710 | } | |
8711 | } | |
8712 | spin_unlock_irq(&ctx->completion_lock); | |
8713 | return found; | |
8714 | } | |
8715 | ||
8716 | static bool io_timeout_remove_link(struct io_ring_ctx *ctx, | |
8717 | struct io_kiocb *req) | |
8718 | { | |
8719 | struct io_kiocb *preq; | |
8720 | bool found = false; | |
8721 | ||
8722 | spin_lock_irq(&ctx->completion_lock); | |
8723 | list_for_each_entry(preq, &ctx->timeout_list, timeout.list) { | |
8724 | found = io_match_link(preq, req); | |
8725 | if (found) { | |
8726 | __io_timeout_cancel(preq); | |
8727 | break; | |
8728 | } | |
8729 | } | |
8730 | spin_unlock_irq(&ctx->completion_lock); | |
8731 | return found; | |
8732 | } | |
8733 | ||
b711d4ea JA |
8734 | static bool io_cancel_link_cb(struct io_wq_work *work, void *data) |
8735 | { | |
9a472ef7 PB |
8736 | struct io_kiocb *req = container_of(work, struct io_kiocb, work); |
8737 | bool ret; | |
8738 | ||
8739 | if (req->flags & REQ_F_LINK_TIMEOUT) { | |
8740 | unsigned long flags; | |
8741 | struct io_ring_ctx *ctx = req->ctx; | |
8742 | ||
8743 | /* protect against races with linked timeouts */ | |
8744 | spin_lock_irqsave(&ctx->completion_lock, flags); | |
8745 | ret = io_match_link(req, data); | |
8746 | spin_unlock_irqrestore(&ctx->completion_lock, flags); | |
8747 | } else { | |
8748 | ret = io_match_link(req, data); | |
8749 | } | |
8750 | return ret; | |
b711d4ea JA |
8751 | } |
8752 | ||
8753 | static void io_attempt_cancel(struct io_ring_ctx *ctx, struct io_kiocb *req) | |
8754 | { | |
8755 | enum io_wq_cancel cret; | |
8756 | ||
8757 | /* cancel this particular work, if it's running */ | |
8758 | cret = io_wq_cancel_work(ctx->io_wq, &req->work); | |
8759 | if (cret != IO_WQ_CANCEL_NOTFOUND) | |
8760 | return; | |
8761 | ||
8762 | /* find links that hold this pending, cancel those */ | |
8763 | cret = io_wq_cancel_cb(ctx->io_wq, io_cancel_link_cb, req, true); | |
8764 | if (cret != IO_WQ_CANCEL_NOTFOUND) | |
8765 | return; | |
8766 | ||
8767 | /* if we have a poll link holding this pending, cancel that */ | |
8768 | if (io_poll_remove_link(ctx, req)) | |
8769 | return; | |
8770 | ||
8771 | /* final option, timeout link is holding this req pending */ | |
8772 | io_timeout_remove_link(ctx, req); | |
8773 | } | |
8774 | ||
b7ddce3c | 8775 | static void io_cancel_defer_files(struct io_ring_ctx *ctx, |
ef9865a4 | 8776 | struct task_struct *task, |
b7ddce3c PB |
8777 | struct files_struct *files) |
8778 | { | |
8779 | struct io_defer_entry *de = NULL; | |
8780 | LIST_HEAD(list); | |
8781 | ||
8782 | spin_lock_irq(&ctx->completion_lock); | |
8783 | list_for_each_entry_reverse(de, &ctx->defer_list, list) { | |
ef9865a4 PB |
8784 | if (io_task_match(de->req, task) && |
8785 | io_match_files(de->req, files)) { | |
b7ddce3c PB |
8786 | list_cut_position(&list, &ctx->defer_list, &de->list); |
8787 | break; | |
8788 | } | |
8789 | } | |
8790 | spin_unlock_irq(&ctx->completion_lock); | |
8791 | ||
8792 | while (!list_empty(&list)) { | |
8793 | de = list_first_entry(&list, struct io_defer_entry, list); | |
8794 | list_del_init(&de->list); | |
8795 | req_set_fail_links(de->req); | |
8796 | io_put_req(de->req); | |
8797 | io_req_complete(de->req, -ECANCELED); | |
8798 | kfree(de); | |
8799 | } | |
8800 | } | |
8801 | ||
76e1b642 JA |
8802 | /* |
8803 | * Returns true if we found and killed one or more files pinning requests | |
8804 | */ | |
8805 | static bool io_uring_cancel_files(struct io_ring_ctx *ctx, | |
fcb323cc JA |
8806 | struct files_struct *files) |
8807 | { | |
67c4d9e6 | 8808 | if (list_empty_careful(&ctx->inflight_list)) |
76e1b642 | 8809 | return false; |
67c4d9e6 PB |
8810 | |
8811 | /* cancel all at once, should be faster than doing it one by one*/ | |
8812 | io_wq_cancel_cb(ctx->io_wq, io_wq_files_match, files, true); | |
8813 | ||
fcb323cc | 8814 | while (!list_empty_careful(&ctx->inflight_list)) { |
d8f1b971 XW |
8815 | struct io_kiocb *cancel_req = NULL, *req; |
8816 | DEFINE_WAIT(wait); | |
fcb323cc JA |
8817 | |
8818 | spin_lock_irq(&ctx->inflight_lock); | |
8819 | list_for_each_entry(req, &ctx->inflight_list, inflight_entry) { | |
dfead8a8 | 8820 | if (files && (req->work.flags & IO_WQ_WORK_FILES) && |
98447d65 | 8821 | req->work.identity->files != files) |
768134d4 JA |
8822 | continue; |
8823 | /* req is being completed, ignore */ | |
8824 | if (!refcount_inc_not_zero(&req->refs)) | |
8825 | continue; | |
8826 | cancel_req = req; | |
8827 | break; | |
fcb323cc | 8828 | } |
768134d4 | 8829 | if (cancel_req) |
fcb323cc | 8830 | prepare_to_wait(&ctx->inflight_wait, &wait, |
768134d4 | 8831 | TASK_UNINTERRUPTIBLE); |
fcb323cc JA |
8832 | spin_unlock_irq(&ctx->inflight_lock); |
8833 | ||
768134d4 JA |
8834 | /* We need to keep going until we don't find a matching req */ |
8835 | if (!cancel_req) | |
fcb323cc | 8836 | break; |
bb175342 PB |
8837 | /* cancel this request, or head link requests */ |
8838 | io_attempt_cancel(ctx, cancel_req); | |
8839 | io_put_req(cancel_req); | |
6200b0ae JA |
8840 | /* cancellations _may_ trigger task work */ |
8841 | io_run_task_work(); | |
fcb323cc | 8842 | schedule(); |
d8f1b971 | 8843 | finish_wait(&ctx->inflight_wait, &wait); |
fcb323cc | 8844 | } |
76e1b642 JA |
8845 | |
8846 | return true; | |
fcb323cc JA |
8847 | } |
8848 | ||
801dd57b | 8849 | static bool io_cancel_task_cb(struct io_wq_work *work, void *data) |
44e728b8 | 8850 | { |
801dd57b PB |
8851 | struct io_kiocb *req = container_of(work, struct io_kiocb, work); |
8852 | struct task_struct *task = data; | |
44e728b8 | 8853 | |
f3606e3a | 8854 | return io_task_match(req, task); |
44e728b8 PB |
8855 | } |
8856 | ||
0f212204 JA |
8857 | static bool __io_uring_cancel_task_requests(struct io_ring_ctx *ctx, |
8858 | struct task_struct *task, | |
8859 | struct files_struct *files) | |
8860 | { | |
8861 | bool ret; | |
8862 | ||
8863 | ret = io_uring_cancel_files(ctx, files); | |
8864 | if (!files) { | |
8865 | enum io_wq_cancel cret; | |
8866 | ||
8867 | cret = io_wq_cancel_cb(ctx->io_wq, io_cancel_task_cb, task, true); | |
8868 | if (cret != IO_WQ_CANCEL_NOTFOUND) | |
8869 | ret = true; | |
8870 | ||
8871 | /* SQPOLL thread does its own polling */ | |
8872 | if (!(ctx->flags & IORING_SETUP_SQPOLL)) { | |
8873 | while (!list_empty_careful(&ctx->iopoll_list)) { | |
8874 | io_iopoll_try_reap_events(ctx); | |
8875 | ret = true; | |
8876 | } | |
8877 | } | |
8878 | ||
8879 | ret |= io_poll_remove_all(ctx, task); | |
8880 | ret |= io_kill_timeouts(ctx, task); | |
8881 | } | |
8882 | ||
8883 | return ret; | |
8884 | } | |
8885 | ||
8886 | /* | |
8887 | * We need to iteratively cancel requests, in case a request has dependent | |
8888 | * hard links. These persist even for failure of cancelations, hence keep | |
8889 | * looping until none are found. | |
8890 | */ | |
8891 | static void io_uring_cancel_task_requests(struct io_ring_ctx *ctx, | |
8892 | struct files_struct *files) | |
8893 | { | |
8894 | struct task_struct *task = current; | |
8895 | ||
fdaf083c | 8896 | if ((ctx->flags & IORING_SETUP_SQPOLL) && ctx->sq_data) { |
534ca6d6 | 8897 | task = ctx->sq_data->thread; |
fdaf083c JA |
8898 | atomic_inc(&task->io_uring->in_idle); |
8899 | io_sq_thread_park(ctx->sq_data); | |
8900 | } | |
0f212204 | 8901 | |
ef9865a4 PB |
8902 | if (files) |
8903 | io_cancel_defer_files(ctx, NULL, files); | |
8904 | else | |
8905 | io_cancel_defer_files(ctx, task, NULL); | |
8906 | ||
0f212204 JA |
8907 | io_cqring_overflow_flush(ctx, true, task, files); |
8908 | ||
8909 | while (__io_uring_cancel_task_requests(ctx, task, files)) { | |
8910 | io_run_task_work(); | |
8911 | cond_resched(); | |
8912 | } | |
fdaf083c JA |
8913 | |
8914 | if ((ctx->flags & IORING_SETUP_SQPOLL) && ctx->sq_data) { | |
8915 | atomic_dec(&task->io_uring->in_idle); | |
8916 | /* | |
8917 | * If the files that are going away are the ones in the thread | |
8918 | * identity, clear them out. | |
8919 | */ | |
8920 | if (task->io_uring->identity->files == files) | |
8921 | task->io_uring->identity->files = NULL; | |
8922 | io_sq_thread_unpark(ctx->sq_data); | |
8923 | } | |
0f212204 JA |
8924 | } |
8925 | ||
8926 | /* | |
8927 | * Note that this task has used io_uring. We use it for cancelation purposes. | |
8928 | */ | |
fdaf083c | 8929 | static int io_uring_add_task_file(struct io_ring_ctx *ctx, struct file *file) |
0f212204 | 8930 | { |
236434c3 MWO |
8931 | struct io_uring_task *tctx = current->io_uring; |
8932 | ||
8933 | if (unlikely(!tctx)) { | |
0f212204 JA |
8934 | int ret; |
8935 | ||
8936 | ret = io_uring_alloc_task_context(current); | |
8937 | if (unlikely(ret)) | |
8938 | return ret; | |
236434c3 | 8939 | tctx = current->io_uring; |
0f212204 | 8940 | } |
236434c3 MWO |
8941 | if (tctx->last != file) { |
8942 | void *old = xa_load(&tctx->xa, (unsigned long)file); | |
0f212204 | 8943 | |
236434c3 | 8944 | if (!old) { |
0f212204 | 8945 | get_file(file); |
236434c3 | 8946 | xa_store(&tctx->xa, (unsigned long)file, file, GFP_KERNEL); |
0f212204 | 8947 | } |
236434c3 | 8948 | tctx->last = file; |
0f212204 JA |
8949 | } |
8950 | ||
fdaf083c JA |
8951 | /* |
8952 | * This is race safe in that the task itself is doing this, hence it | |
8953 | * cannot be going through the exit/cancel paths at the same time. | |
8954 | * This cannot be modified while exit/cancel is running. | |
8955 | */ | |
8956 | if (!tctx->sqpoll && (ctx->flags & IORING_SETUP_SQPOLL)) | |
8957 | tctx->sqpoll = true; | |
8958 | ||
0f212204 JA |
8959 | return 0; |
8960 | } | |
8961 | ||
8962 | /* | |
8963 | * Remove this io_uring_file -> task mapping. | |
8964 | */ | |
8965 | static void io_uring_del_task_file(struct file *file) | |
8966 | { | |
8967 | struct io_uring_task *tctx = current->io_uring; | |
0f212204 JA |
8968 | |
8969 | if (tctx->last == file) | |
8970 | tctx->last = NULL; | |
5e2ed8c4 | 8971 | file = xa_erase(&tctx->xa, (unsigned long)file); |
0f212204 JA |
8972 | if (file) |
8973 | fput(file); | |
8974 | } | |
8975 | ||
0f212204 JA |
8976 | /* |
8977 | * Drop task note for this file if we're the only ones that hold it after | |
8978 | * pending fput() | |
8979 | */ | |
c8fb20b5 | 8980 | static void io_uring_attempt_task_drop(struct file *file) |
0f212204 JA |
8981 | { |
8982 | if (!current->io_uring) | |
8983 | return; | |
8984 | /* | |
8985 | * fput() is pending, will be 2 if the only other ref is our potential | |
8986 | * task file note. If the task is exiting, drop regardless of count. | |
8987 | */ | |
c8fb20b5 PB |
8988 | if (fatal_signal_pending(current) || (current->flags & PF_EXITING) || |
8989 | atomic_long_read(&file->f_count) == 2) | |
8990 | io_uring_del_task_file(file); | |
0f212204 JA |
8991 | } |
8992 | ||
8993 | void __io_uring_files_cancel(struct files_struct *files) | |
8994 | { | |
8995 | struct io_uring_task *tctx = current->io_uring; | |
ce765372 MWO |
8996 | struct file *file; |
8997 | unsigned long index; | |
0f212204 JA |
8998 | |
8999 | /* make sure overflow events are dropped */ | |
fdaf083c | 9000 | atomic_inc(&tctx->in_idle); |
0f212204 | 9001 | |
ce765372 MWO |
9002 | xa_for_each(&tctx->xa, index, file) { |
9003 | struct io_ring_ctx *ctx = file->private_data; | |
0f212204 JA |
9004 | |
9005 | io_uring_cancel_task_requests(ctx, files); | |
9006 | if (files) | |
9007 | io_uring_del_task_file(file); | |
ce765372 | 9008 | } |
fdaf083c JA |
9009 | |
9010 | atomic_dec(&tctx->in_idle); | |
9011 | } | |
9012 | ||
9013 | static s64 tctx_inflight(struct io_uring_task *tctx) | |
9014 | { | |
9015 | unsigned long index; | |
9016 | struct file *file; | |
9017 | s64 inflight; | |
9018 | ||
9019 | inflight = percpu_counter_sum(&tctx->inflight); | |
9020 | if (!tctx->sqpoll) | |
9021 | return inflight; | |
9022 | ||
9023 | /* | |
9024 | * If we have SQPOLL rings, then we need to iterate and find them, and | |
9025 | * add the pending count for those. | |
9026 | */ | |
9027 | xa_for_each(&tctx->xa, index, file) { | |
9028 | struct io_ring_ctx *ctx = file->private_data; | |
9029 | ||
9030 | if (ctx->flags & IORING_SETUP_SQPOLL) { | |
9031 | struct io_uring_task *__tctx = ctx->sqo_task->io_uring; | |
9032 | ||
9033 | inflight += percpu_counter_sum(&__tctx->inflight); | |
9034 | } | |
9035 | } | |
9036 | ||
9037 | return inflight; | |
0f212204 JA |
9038 | } |
9039 | ||
0f212204 JA |
9040 | /* |
9041 | * Find any io_uring fd that this task has registered or done IO on, and cancel | |
9042 | * requests. | |
9043 | */ | |
9044 | void __io_uring_task_cancel(void) | |
9045 | { | |
9046 | struct io_uring_task *tctx = current->io_uring; | |
9047 | DEFINE_WAIT(wait); | |
d8a6df10 | 9048 | s64 inflight; |
0f212204 JA |
9049 | |
9050 | /* make sure overflow events are dropped */ | |
fdaf083c | 9051 | atomic_inc(&tctx->in_idle); |
0f212204 | 9052 | |
d8a6df10 | 9053 | do { |
0f212204 | 9054 | /* read completions before cancelations */ |
fdaf083c | 9055 | inflight = tctx_inflight(tctx); |
d8a6df10 JA |
9056 | if (!inflight) |
9057 | break; | |
0f212204 JA |
9058 | __io_uring_files_cancel(NULL); |
9059 | ||
9060 | prepare_to_wait(&tctx->wait, &wait, TASK_UNINTERRUPTIBLE); | |
9061 | ||
9062 | /* | |
9063 | * If we've seen completions, retry. This avoids a race where | |
9064 | * a completion comes in before we did prepare_to_wait(). | |
9065 | */ | |
fdaf083c | 9066 | if (inflight != tctx_inflight(tctx)) |
0f212204 | 9067 | continue; |
0f212204 | 9068 | schedule(); |
d8a6df10 | 9069 | } while (1); |
0f212204 JA |
9070 | |
9071 | finish_wait(&tctx->wait, &wait); | |
fdaf083c | 9072 | atomic_dec(&tctx->in_idle); |
44e728b8 PB |
9073 | } |
9074 | ||
fcb323cc JA |
9075 | static int io_uring_flush(struct file *file, void *data) |
9076 | { | |
c8fb20b5 | 9077 | io_uring_attempt_task_drop(file); |
fcb323cc JA |
9078 | return 0; |
9079 | } | |
9080 | ||
6c5c240e RP |
9081 | static void *io_uring_validate_mmap_request(struct file *file, |
9082 | loff_t pgoff, size_t sz) | |
2b188cc1 | 9083 | { |
2b188cc1 | 9084 | struct io_ring_ctx *ctx = file->private_data; |
6c5c240e | 9085 | loff_t offset = pgoff << PAGE_SHIFT; |
2b188cc1 JA |
9086 | struct page *page; |
9087 | void *ptr; | |
9088 | ||
9089 | switch (offset) { | |
9090 | case IORING_OFF_SQ_RING: | |
75b28aff HV |
9091 | case IORING_OFF_CQ_RING: |
9092 | ptr = ctx->rings; | |
2b188cc1 JA |
9093 | break; |
9094 | case IORING_OFF_SQES: | |
9095 | ptr = ctx->sq_sqes; | |
9096 | break; | |
2b188cc1 | 9097 | default: |
6c5c240e | 9098 | return ERR_PTR(-EINVAL); |
2b188cc1 JA |
9099 | } |
9100 | ||
9101 | page = virt_to_head_page(ptr); | |
a50b854e | 9102 | if (sz > page_size(page)) |
6c5c240e RP |
9103 | return ERR_PTR(-EINVAL); |
9104 | ||
9105 | return ptr; | |
9106 | } | |
9107 | ||
9108 | #ifdef CONFIG_MMU | |
9109 | ||
9110 | static int io_uring_mmap(struct file *file, struct vm_area_struct *vma) | |
9111 | { | |
9112 | size_t sz = vma->vm_end - vma->vm_start; | |
9113 | unsigned long pfn; | |
9114 | void *ptr; | |
9115 | ||
9116 | ptr = io_uring_validate_mmap_request(file, vma->vm_pgoff, sz); | |
9117 | if (IS_ERR(ptr)) | |
9118 | return PTR_ERR(ptr); | |
2b188cc1 JA |
9119 | |
9120 | pfn = virt_to_phys(ptr) >> PAGE_SHIFT; | |
9121 | return remap_pfn_range(vma, vma->vm_start, pfn, sz, vma->vm_page_prot); | |
9122 | } | |
9123 | ||
6c5c240e RP |
9124 | #else /* !CONFIG_MMU */ |
9125 | ||
9126 | static int io_uring_mmap(struct file *file, struct vm_area_struct *vma) | |
9127 | { | |
9128 | return vma->vm_flags & (VM_SHARED | VM_MAYSHARE) ? 0 : -EINVAL; | |
9129 | } | |
9130 | ||
9131 | static unsigned int io_uring_nommu_mmap_capabilities(struct file *file) | |
9132 | { | |
9133 | return NOMMU_MAP_DIRECT | NOMMU_MAP_READ | NOMMU_MAP_WRITE; | |
9134 | } | |
9135 | ||
9136 | static unsigned long io_uring_nommu_get_unmapped_area(struct file *file, | |
9137 | unsigned long addr, unsigned long len, | |
9138 | unsigned long pgoff, unsigned long flags) | |
9139 | { | |
9140 | void *ptr; | |
9141 | ||
9142 | ptr = io_uring_validate_mmap_request(file, pgoff, len); | |
9143 | if (IS_ERR(ptr)) | |
9144 | return PTR_ERR(ptr); | |
9145 | ||
9146 | return (unsigned long) ptr; | |
9147 | } | |
9148 | ||
9149 | #endif /* !CONFIG_MMU */ | |
9150 | ||
90554200 JA |
9151 | static void io_sqpoll_wait_sq(struct io_ring_ctx *ctx) |
9152 | { | |
9153 | DEFINE_WAIT(wait); | |
9154 | ||
9155 | do { | |
9156 | if (!io_sqring_full(ctx)) | |
9157 | break; | |
9158 | ||
9159 | prepare_to_wait(&ctx->sqo_sq_wait, &wait, TASK_INTERRUPTIBLE); | |
9160 | ||
9161 | if (!io_sqring_full(ctx)) | |
9162 | break; | |
9163 | ||
9164 | schedule(); | |
9165 | } while (!signal_pending(current)); | |
9166 | ||
9167 | finish_wait(&ctx->sqo_sq_wait, &wait); | |
9168 | } | |
9169 | ||
2b188cc1 JA |
9170 | SYSCALL_DEFINE6(io_uring_enter, unsigned int, fd, u32, to_submit, |
9171 | u32, min_complete, u32, flags, const sigset_t __user *, sig, | |
9172 | size_t, sigsz) | |
9173 | { | |
9174 | struct io_ring_ctx *ctx; | |
9175 | long ret = -EBADF; | |
9176 | int submitted = 0; | |
9177 | struct fd f; | |
9178 | ||
4c6e277c | 9179 | io_run_task_work(); |
b41e9852 | 9180 | |
90554200 JA |
9181 | if (flags & ~(IORING_ENTER_GETEVENTS | IORING_ENTER_SQ_WAKEUP | |
9182 | IORING_ENTER_SQ_WAIT)) | |
2b188cc1 JA |
9183 | return -EINVAL; |
9184 | ||
9185 | f = fdget(fd); | |
9186 | if (!f.file) | |
9187 | return -EBADF; | |
9188 | ||
9189 | ret = -EOPNOTSUPP; | |
9190 | if (f.file->f_op != &io_uring_fops) | |
9191 | goto out_fput; | |
9192 | ||
9193 | ret = -ENXIO; | |
9194 | ctx = f.file->private_data; | |
9195 | if (!percpu_ref_tryget(&ctx->refs)) | |
9196 | goto out_fput; | |
9197 | ||
7e84e1c7 SG |
9198 | ret = -EBADFD; |
9199 | if (ctx->flags & IORING_SETUP_R_DISABLED) | |
9200 | goto out; | |
9201 | ||
6c271ce2 JA |
9202 | /* |
9203 | * For SQ polling, the thread will do all submissions and completions. | |
9204 | * Just return the requested submit count, and wake the thread if | |
9205 | * we were asked to. | |
9206 | */ | |
b2a9eada | 9207 | ret = 0; |
6c271ce2 | 9208 | if (ctx->flags & IORING_SETUP_SQPOLL) { |
c1edbf5f | 9209 | if (!list_empty_careful(&ctx->cq_overflow_list)) |
e6c8aa9a | 9210 | io_cqring_overflow_flush(ctx, false, NULL, NULL); |
6c271ce2 | 9211 | if (flags & IORING_ENTER_SQ_WAKEUP) |
534ca6d6 | 9212 | wake_up(&ctx->sq_data->wait); |
90554200 JA |
9213 | if (flags & IORING_ENTER_SQ_WAIT) |
9214 | io_sqpoll_wait_sq(ctx); | |
6c271ce2 | 9215 | submitted = to_submit; |
b2a9eada | 9216 | } else if (to_submit) { |
fdaf083c | 9217 | ret = io_uring_add_task_file(ctx, f.file); |
0f212204 JA |
9218 | if (unlikely(ret)) |
9219 | goto out; | |
2b188cc1 | 9220 | mutex_lock(&ctx->uring_lock); |
0f212204 | 9221 | submitted = io_submit_sqes(ctx, to_submit); |
2b188cc1 | 9222 | mutex_unlock(&ctx->uring_lock); |
7c504e65 PB |
9223 | |
9224 | if (submitted != to_submit) | |
9225 | goto out; | |
2b188cc1 JA |
9226 | } |
9227 | if (flags & IORING_ENTER_GETEVENTS) { | |
9228 | min_complete = min(min_complete, ctx->cq_entries); | |
9229 | ||
32b2244a XW |
9230 | /* |
9231 | * When SETUP_IOPOLL and SETUP_SQPOLL are both enabled, user | |
9232 | * space applications don't need to do io completion events | |
9233 | * polling again, they can rely on io_sq_thread to do polling | |
9234 | * work, which can reduce cpu usage and uring_lock contention. | |
9235 | */ | |
9236 | if (ctx->flags & IORING_SETUP_IOPOLL && | |
9237 | !(ctx->flags & IORING_SETUP_SQPOLL)) { | |
7668b92a | 9238 | ret = io_iopoll_check(ctx, min_complete); |
def596e9 JA |
9239 | } else { |
9240 | ret = io_cqring_wait(ctx, min_complete, sig, sigsz); | |
9241 | } | |
2b188cc1 JA |
9242 | } |
9243 | ||
7c504e65 | 9244 | out: |
6805b32e | 9245 | percpu_ref_put(&ctx->refs); |
2b188cc1 JA |
9246 | out_fput: |
9247 | fdput(f); | |
9248 | return submitted ? submitted : ret; | |
9249 | } | |
9250 | ||
bebdb65e | 9251 | #ifdef CONFIG_PROC_FS |
87ce955b JA |
9252 | static int io_uring_show_cred(int id, void *p, void *data) |
9253 | { | |
6b47ab81 JA |
9254 | struct io_identity *iod = p; |
9255 | const struct cred *cred = iod->creds; | |
87ce955b JA |
9256 | struct seq_file *m = data; |
9257 | struct user_namespace *uns = seq_user_ns(m); | |
9258 | struct group_info *gi; | |
9259 | kernel_cap_t cap; | |
9260 | unsigned __capi; | |
9261 | int g; | |
9262 | ||
9263 | seq_printf(m, "%5d\n", id); | |
9264 | seq_put_decimal_ull(m, "\tUid:\t", from_kuid_munged(uns, cred->uid)); | |
9265 | seq_put_decimal_ull(m, "\t\t", from_kuid_munged(uns, cred->euid)); | |
9266 | seq_put_decimal_ull(m, "\t\t", from_kuid_munged(uns, cred->suid)); | |
9267 | seq_put_decimal_ull(m, "\t\t", from_kuid_munged(uns, cred->fsuid)); | |
9268 | seq_put_decimal_ull(m, "\n\tGid:\t", from_kgid_munged(uns, cred->gid)); | |
9269 | seq_put_decimal_ull(m, "\t\t", from_kgid_munged(uns, cred->egid)); | |
9270 | seq_put_decimal_ull(m, "\t\t", from_kgid_munged(uns, cred->sgid)); | |
9271 | seq_put_decimal_ull(m, "\t\t", from_kgid_munged(uns, cred->fsgid)); | |
9272 | seq_puts(m, "\n\tGroups:\t"); | |
9273 | gi = cred->group_info; | |
9274 | for (g = 0; g < gi->ngroups; g++) { | |
9275 | seq_put_decimal_ull(m, g ? " " : "", | |
9276 | from_kgid_munged(uns, gi->gid[g])); | |
9277 | } | |
9278 | seq_puts(m, "\n\tCapEff:\t"); | |
9279 | cap = cred->cap_effective; | |
9280 | CAP_FOR_EACH_U32(__capi) | |
9281 | seq_put_hex_ll(m, NULL, cap.cap[CAP_LAST_U32 - __capi], 8); | |
9282 | seq_putc(m, '\n'); | |
9283 | return 0; | |
9284 | } | |
9285 | ||
9286 | static void __io_uring_show_fdinfo(struct io_ring_ctx *ctx, struct seq_file *m) | |
9287 | { | |
dbbe9c64 | 9288 | struct io_sq_data *sq = NULL; |
fad8e0de | 9289 | bool has_lock; |
87ce955b JA |
9290 | int i; |
9291 | ||
fad8e0de JA |
9292 | /* |
9293 | * Avoid ABBA deadlock between the seq lock and the io_uring mutex, | |
9294 | * since fdinfo case grabs it in the opposite direction of normal use | |
9295 | * cases. If we fail to get the lock, we just don't iterate any | |
9296 | * structures that could be going away outside the io_uring mutex. | |
9297 | */ | |
9298 | has_lock = mutex_trylock(&ctx->uring_lock); | |
9299 | ||
dbbe9c64 JQ |
9300 | if (has_lock && (ctx->flags & IORING_SETUP_SQPOLL)) |
9301 | sq = ctx->sq_data; | |
9302 | ||
9303 | seq_printf(m, "SqThread:\t%d\n", sq ? task_pid_nr(sq->thread) : -1); | |
9304 | seq_printf(m, "SqThreadCpu:\t%d\n", sq ? task_cpu(sq->thread) : -1); | |
87ce955b | 9305 | seq_printf(m, "UserFiles:\t%u\n", ctx->nr_user_files); |
fad8e0de | 9306 | for (i = 0; has_lock && i < ctx->nr_user_files; i++) { |
87ce955b JA |
9307 | struct fixed_file_table *table; |
9308 | struct file *f; | |
9309 | ||
9310 | table = &ctx->file_data->table[i >> IORING_FILE_TABLE_SHIFT]; | |
9311 | f = table->files[i & IORING_FILE_TABLE_MASK]; | |
9312 | if (f) | |
9313 | seq_printf(m, "%5u: %s\n", i, file_dentry(f)->d_iname); | |
9314 | else | |
9315 | seq_printf(m, "%5u: <none>\n", i); | |
9316 | } | |
9317 | seq_printf(m, "UserBufs:\t%u\n", ctx->nr_user_bufs); | |
fad8e0de | 9318 | for (i = 0; has_lock && i < ctx->nr_user_bufs; i++) { |
87ce955b JA |
9319 | struct io_mapped_ubuf *buf = &ctx->user_bufs[i]; |
9320 | ||
9321 | seq_printf(m, "%5u: 0x%llx/%u\n", i, buf->ubuf, | |
9322 | (unsigned int) buf->len); | |
9323 | } | |
fad8e0de | 9324 | if (has_lock && !idr_is_empty(&ctx->personality_idr)) { |
87ce955b JA |
9325 | seq_printf(m, "Personalities:\n"); |
9326 | idr_for_each(&ctx->personality_idr, io_uring_show_cred, m); | |
9327 | } | |
d7718a9d JA |
9328 | seq_printf(m, "PollList:\n"); |
9329 | spin_lock_irq(&ctx->completion_lock); | |
9330 | for (i = 0; i < (1U << ctx->cancel_hash_bits); i++) { | |
9331 | struct hlist_head *list = &ctx->cancel_hash[i]; | |
9332 | struct io_kiocb *req; | |
9333 | ||
9334 | hlist_for_each_entry(req, list, hash_node) | |
9335 | seq_printf(m, " op=%d, task_works=%d\n", req->opcode, | |
9336 | req->task->task_works != NULL); | |
9337 | } | |
9338 | spin_unlock_irq(&ctx->completion_lock); | |
fad8e0de JA |
9339 | if (has_lock) |
9340 | mutex_unlock(&ctx->uring_lock); | |
87ce955b JA |
9341 | } |
9342 | ||
9343 | static void io_uring_show_fdinfo(struct seq_file *m, struct file *f) | |
9344 | { | |
9345 | struct io_ring_ctx *ctx = f->private_data; | |
9346 | ||
9347 | if (percpu_ref_tryget(&ctx->refs)) { | |
9348 | __io_uring_show_fdinfo(ctx, m); | |
9349 | percpu_ref_put(&ctx->refs); | |
9350 | } | |
9351 | } | |
bebdb65e | 9352 | #endif |
87ce955b | 9353 | |
2b188cc1 JA |
9354 | static const struct file_operations io_uring_fops = { |
9355 | .release = io_uring_release, | |
fcb323cc | 9356 | .flush = io_uring_flush, |
2b188cc1 | 9357 | .mmap = io_uring_mmap, |
6c5c240e RP |
9358 | #ifndef CONFIG_MMU |
9359 | .get_unmapped_area = io_uring_nommu_get_unmapped_area, | |
9360 | .mmap_capabilities = io_uring_nommu_mmap_capabilities, | |
9361 | #endif | |
2b188cc1 JA |
9362 | .poll = io_uring_poll, |
9363 | .fasync = io_uring_fasync, | |
bebdb65e | 9364 | #ifdef CONFIG_PROC_FS |
87ce955b | 9365 | .show_fdinfo = io_uring_show_fdinfo, |
bebdb65e | 9366 | #endif |
2b188cc1 JA |
9367 | }; |
9368 | ||
9369 | static int io_allocate_scq_urings(struct io_ring_ctx *ctx, | |
9370 | struct io_uring_params *p) | |
9371 | { | |
75b28aff HV |
9372 | struct io_rings *rings; |
9373 | size_t size, sq_array_offset; | |
2b188cc1 | 9374 | |
bd740481 JA |
9375 | /* make sure these are sane, as we already accounted them */ |
9376 | ctx->sq_entries = p->sq_entries; | |
9377 | ctx->cq_entries = p->cq_entries; | |
9378 | ||
75b28aff HV |
9379 | size = rings_size(p->sq_entries, p->cq_entries, &sq_array_offset); |
9380 | if (size == SIZE_MAX) | |
9381 | return -EOVERFLOW; | |
9382 | ||
9383 | rings = io_mem_alloc(size); | |
9384 | if (!rings) | |
2b188cc1 JA |
9385 | return -ENOMEM; |
9386 | ||
75b28aff HV |
9387 | ctx->rings = rings; |
9388 | ctx->sq_array = (u32 *)((char *)rings + sq_array_offset); | |
9389 | rings->sq_ring_mask = p->sq_entries - 1; | |
9390 | rings->cq_ring_mask = p->cq_entries - 1; | |
9391 | rings->sq_ring_entries = p->sq_entries; | |
9392 | rings->cq_ring_entries = p->cq_entries; | |
9393 | ctx->sq_mask = rings->sq_ring_mask; | |
9394 | ctx->cq_mask = rings->cq_ring_mask; | |
2b188cc1 JA |
9395 | |
9396 | size = array_size(sizeof(struct io_uring_sqe), p->sq_entries); | |
eb065d30 JA |
9397 | if (size == SIZE_MAX) { |
9398 | io_mem_free(ctx->rings); | |
9399 | ctx->rings = NULL; | |
2b188cc1 | 9400 | return -EOVERFLOW; |
eb065d30 | 9401 | } |
2b188cc1 JA |
9402 | |
9403 | ctx->sq_sqes = io_mem_alloc(size); | |
eb065d30 JA |
9404 | if (!ctx->sq_sqes) { |
9405 | io_mem_free(ctx->rings); | |
9406 | ctx->rings = NULL; | |
2b188cc1 | 9407 | return -ENOMEM; |
eb065d30 | 9408 | } |
2b188cc1 | 9409 | |
2b188cc1 JA |
9410 | return 0; |
9411 | } | |
9412 | ||
9413 | /* | |
9414 | * Allocate an anonymous fd, this is what constitutes the application | |
9415 | * visible backing of an io_uring instance. The application mmaps this | |
9416 | * fd to gain access to the SQ/CQ ring details. If UNIX sockets are enabled, | |
9417 | * we have to tie this fd to a socket for file garbage collection purposes. | |
9418 | */ | |
9419 | static int io_uring_get_fd(struct io_ring_ctx *ctx) | |
9420 | { | |
9421 | struct file *file; | |
9422 | int ret; | |
9423 | ||
9424 | #if defined(CONFIG_UNIX) | |
9425 | ret = sock_create_kern(&init_net, PF_UNIX, SOCK_RAW, IPPROTO_IP, | |
9426 | &ctx->ring_sock); | |
9427 | if (ret) | |
9428 | return ret; | |
9429 | #endif | |
9430 | ||
9431 | ret = get_unused_fd_flags(O_RDWR | O_CLOEXEC); | |
9432 | if (ret < 0) | |
9433 | goto err; | |
9434 | ||
9435 | file = anon_inode_getfile("[io_uring]", &io_uring_fops, ctx, | |
9436 | O_RDWR | O_CLOEXEC); | |
9437 | if (IS_ERR(file)) { | |
0f212204 | 9438 | err_fd: |
2b188cc1 JA |
9439 | put_unused_fd(ret); |
9440 | ret = PTR_ERR(file); | |
9441 | goto err; | |
9442 | } | |
9443 | ||
9444 | #if defined(CONFIG_UNIX) | |
9445 | ctx->ring_sock->file = file; | |
9446 | #endif | |
fdaf083c | 9447 | if (unlikely(io_uring_add_task_file(ctx, file))) { |
0f212204 JA |
9448 | file = ERR_PTR(-ENOMEM); |
9449 | goto err_fd; | |
9450 | } | |
2b188cc1 JA |
9451 | fd_install(ret, file); |
9452 | return ret; | |
9453 | err: | |
9454 | #if defined(CONFIG_UNIX) | |
9455 | sock_release(ctx->ring_sock); | |
9456 | ctx->ring_sock = NULL; | |
9457 | #endif | |
9458 | return ret; | |
9459 | } | |
9460 | ||
7f13657d XW |
9461 | static int io_uring_create(unsigned entries, struct io_uring_params *p, |
9462 | struct io_uring_params __user *params) | |
2b188cc1 JA |
9463 | { |
9464 | struct user_struct *user = NULL; | |
9465 | struct io_ring_ctx *ctx; | |
aad5d8da | 9466 | bool limit_mem; |
2b188cc1 JA |
9467 | int ret; |
9468 | ||
8110c1a6 | 9469 | if (!entries) |
2b188cc1 | 9470 | return -EINVAL; |
8110c1a6 JA |
9471 | if (entries > IORING_MAX_ENTRIES) { |
9472 | if (!(p->flags & IORING_SETUP_CLAMP)) | |
9473 | return -EINVAL; | |
9474 | entries = IORING_MAX_ENTRIES; | |
9475 | } | |
2b188cc1 JA |
9476 | |
9477 | /* | |
9478 | * Use twice as many entries for the CQ ring. It's possible for the | |
9479 | * application to drive a higher depth than the size of the SQ ring, | |
9480 | * since the sqes are only used at submission time. This allows for | |
33a107f0 JA |
9481 | * some flexibility in overcommitting a bit. If the application has |
9482 | * set IORING_SETUP_CQSIZE, it will have passed in the desired number | |
9483 | * of CQ ring entries manually. | |
2b188cc1 JA |
9484 | */ |
9485 | p->sq_entries = roundup_pow_of_two(entries); | |
33a107f0 JA |
9486 | if (p->flags & IORING_SETUP_CQSIZE) { |
9487 | /* | |
9488 | * If IORING_SETUP_CQSIZE is set, we do the same roundup | |
9489 | * to a power-of-two, if it isn't already. We do NOT impose | |
9490 | * any cq vs sq ring sizing. | |
9491 | */ | |
88ec3211 | 9492 | p->cq_entries = roundup_pow_of_two(p->cq_entries); |
8110c1a6 | 9493 | if (p->cq_entries < p->sq_entries) |
33a107f0 | 9494 | return -EINVAL; |
8110c1a6 JA |
9495 | if (p->cq_entries > IORING_MAX_CQ_ENTRIES) { |
9496 | if (!(p->flags & IORING_SETUP_CLAMP)) | |
9497 | return -EINVAL; | |
9498 | p->cq_entries = IORING_MAX_CQ_ENTRIES; | |
9499 | } | |
33a107f0 JA |
9500 | } else { |
9501 | p->cq_entries = 2 * p->sq_entries; | |
9502 | } | |
2b188cc1 JA |
9503 | |
9504 | user = get_uid(current_user()); | |
aad5d8da | 9505 | limit_mem = !capable(CAP_IPC_LOCK); |
2b188cc1 | 9506 | |
aad5d8da | 9507 | if (limit_mem) { |
a087e2b5 | 9508 | ret = __io_account_mem(user, |
2b188cc1 JA |
9509 | ring_pages(p->sq_entries, p->cq_entries)); |
9510 | if (ret) { | |
9511 | free_uid(user); | |
9512 | return ret; | |
9513 | } | |
9514 | } | |
9515 | ||
9516 | ctx = io_ring_ctx_alloc(p); | |
9517 | if (!ctx) { | |
aad5d8da | 9518 | if (limit_mem) |
a087e2b5 | 9519 | __io_unaccount_mem(user, ring_pages(p->sq_entries, |
2b188cc1 JA |
9520 | p->cq_entries)); |
9521 | free_uid(user); | |
9522 | return -ENOMEM; | |
9523 | } | |
9524 | ctx->compat = in_compat_syscall(); | |
2b188cc1 | 9525 | ctx->user = user; |
0b8c0ec7 | 9526 | ctx->creds = get_current_cred(); |
4ea33a97 JA |
9527 | #ifdef CONFIG_AUDIT |
9528 | ctx->loginuid = current->loginuid; | |
9529 | ctx->sessionid = current->sessionid; | |
9530 | #endif | |
2aede0e4 JA |
9531 | ctx->sqo_task = get_task_struct(current); |
9532 | ||
9533 | /* | |
9534 | * This is just grabbed for accounting purposes. When a process exits, | |
9535 | * the mm is exited and dropped before the files, hence we need to hang | |
9536 | * on to this mm purely for the purposes of being able to unaccount | |
9537 | * memory (locked/pinned vm). It's not used for anything else. | |
9538 | */ | |
6b7898eb | 9539 | mmgrab(current->mm); |
2aede0e4 | 9540 | ctx->mm_account = current->mm; |
6b7898eb | 9541 | |
91d8f519 DZ |
9542 | #ifdef CONFIG_BLK_CGROUP |
9543 | /* | |
9544 | * The sq thread will belong to the original cgroup it was inited in. | |
9545 | * If the cgroup goes offline (e.g. disabling the io controller), then | |
9546 | * issued bios will be associated with the closest cgroup later in the | |
9547 | * block layer. | |
9548 | */ | |
9549 | rcu_read_lock(); | |
9550 | ctx->sqo_blkcg_css = blkcg_css(); | |
9551 | ret = css_tryget_online(ctx->sqo_blkcg_css); | |
9552 | rcu_read_unlock(); | |
9553 | if (!ret) { | |
9554 | /* don't init against a dying cgroup, have the user try again */ | |
9555 | ctx->sqo_blkcg_css = NULL; | |
9556 | ret = -ENODEV; | |
9557 | goto err; | |
9558 | } | |
9559 | #endif | |
6b7898eb | 9560 | |
f74441e6 JA |
9561 | /* |
9562 | * Account memory _before_ installing the file descriptor. Once | |
9563 | * the descriptor is installed, it can get closed at any time. Also | |
9564 | * do this before hitting the general error path, as ring freeing | |
9565 | * will un-account as well. | |
9566 | */ | |
9567 | io_account_mem(ctx, ring_pages(p->sq_entries, p->cq_entries), | |
9568 | ACCT_LOCKED); | |
9569 | ctx->limit_mem = limit_mem; | |
9570 | ||
2b188cc1 JA |
9571 | ret = io_allocate_scq_urings(ctx, p); |
9572 | if (ret) | |
9573 | goto err; | |
9574 | ||
7e84e1c7 | 9575 | ret = io_sq_offload_create(ctx, p); |
2b188cc1 JA |
9576 | if (ret) |
9577 | goto err; | |
9578 | ||
7e84e1c7 SG |
9579 | if (!(p->flags & IORING_SETUP_R_DISABLED)) |
9580 | io_sq_offload_start(ctx); | |
9581 | ||
2b188cc1 | 9582 | memset(&p->sq_off, 0, sizeof(p->sq_off)); |
75b28aff HV |
9583 | p->sq_off.head = offsetof(struct io_rings, sq.head); |
9584 | p->sq_off.tail = offsetof(struct io_rings, sq.tail); | |
9585 | p->sq_off.ring_mask = offsetof(struct io_rings, sq_ring_mask); | |
9586 | p->sq_off.ring_entries = offsetof(struct io_rings, sq_ring_entries); | |
9587 | p->sq_off.flags = offsetof(struct io_rings, sq_flags); | |
9588 | p->sq_off.dropped = offsetof(struct io_rings, sq_dropped); | |
9589 | p->sq_off.array = (char *)ctx->sq_array - (char *)ctx->rings; | |
2b188cc1 JA |
9590 | |
9591 | memset(&p->cq_off, 0, sizeof(p->cq_off)); | |
75b28aff HV |
9592 | p->cq_off.head = offsetof(struct io_rings, cq.head); |
9593 | p->cq_off.tail = offsetof(struct io_rings, cq.tail); | |
9594 | p->cq_off.ring_mask = offsetof(struct io_rings, cq_ring_mask); | |
9595 | p->cq_off.ring_entries = offsetof(struct io_rings, cq_ring_entries); | |
9596 | p->cq_off.overflow = offsetof(struct io_rings, cq_overflow); | |
9597 | p->cq_off.cqes = offsetof(struct io_rings, cqes); | |
0d9b5b3a | 9598 | p->cq_off.flags = offsetof(struct io_rings, cq_flags); |
ac90f249 | 9599 | |
7f13657d XW |
9600 | p->features = IORING_FEAT_SINGLE_MMAP | IORING_FEAT_NODROP | |
9601 | IORING_FEAT_SUBMIT_STABLE | IORING_FEAT_RW_CUR_POS | | |
5769a351 | 9602 | IORING_FEAT_CUR_PERSONALITY | IORING_FEAT_FAST_POLL | |
28cea78a | 9603 | IORING_FEAT_POLL_32BITS | IORING_FEAT_SQPOLL_NONFIXED; |
7f13657d XW |
9604 | |
9605 | if (copy_to_user(params, p, sizeof(*p))) { | |
9606 | ret = -EFAULT; | |
9607 | goto err; | |
9608 | } | |
d1719f70 | 9609 | |
044c1ab3 JA |
9610 | /* |
9611 | * Install ring fd as the very last thing, so we don't risk someone | |
9612 | * having closed it before we finish setup | |
9613 | */ | |
9614 | ret = io_uring_get_fd(ctx); | |
9615 | if (ret < 0) | |
9616 | goto err; | |
9617 | ||
c826bd7a | 9618 | trace_io_uring_create(ret, ctx, p->sq_entries, p->cq_entries, p->flags); |
2b188cc1 JA |
9619 | return ret; |
9620 | err: | |
9621 | io_ring_ctx_wait_and_kill(ctx); | |
9622 | return ret; | |
9623 | } | |
9624 | ||
9625 | /* | |
9626 | * Sets up an aio uring context, and returns the fd. Applications asks for a | |
9627 | * ring size, we return the actual sq/cq ring sizes (among other things) in the | |
9628 | * params structure passed in. | |
9629 | */ | |
9630 | static long io_uring_setup(u32 entries, struct io_uring_params __user *params) | |
9631 | { | |
9632 | struct io_uring_params p; | |
2b188cc1 JA |
9633 | int i; |
9634 | ||
9635 | if (copy_from_user(&p, params, sizeof(p))) | |
9636 | return -EFAULT; | |
9637 | for (i = 0; i < ARRAY_SIZE(p.resv); i++) { | |
9638 | if (p.resv[i]) | |
9639 | return -EINVAL; | |
9640 | } | |
9641 | ||
6c271ce2 | 9642 | if (p.flags & ~(IORING_SETUP_IOPOLL | IORING_SETUP_SQPOLL | |
8110c1a6 | 9643 | IORING_SETUP_SQ_AFF | IORING_SETUP_CQSIZE | |
7e84e1c7 SG |
9644 | IORING_SETUP_CLAMP | IORING_SETUP_ATTACH_WQ | |
9645 | IORING_SETUP_R_DISABLED)) | |
2b188cc1 JA |
9646 | return -EINVAL; |
9647 | ||
7f13657d | 9648 | return io_uring_create(entries, &p, params); |
2b188cc1 JA |
9649 | } |
9650 | ||
9651 | SYSCALL_DEFINE2(io_uring_setup, u32, entries, | |
9652 | struct io_uring_params __user *, params) | |
9653 | { | |
9654 | return io_uring_setup(entries, params); | |
9655 | } | |
9656 | ||
66f4af93 JA |
9657 | static int io_probe(struct io_ring_ctx *ctx, void __user *arg, unsigned nr_args) |
9658 | { | |
9659 | struct io_uring_probe *p; | |
9660 | size_t size; | |
9661 | int i, ret; | |
9662 | ||
9663 | size = struct_size(p, ops, nr_args); | |
9664 | if (size == SIZE_MAX) | |
9665 | return -EOVERFLOW; | |
9666 | p = kzalloc(size, GFP_KERNEL); | |
9667 | if (!p) | |
9668 | return -ENOMEM; | |
9669 | ||
9670 | ret = -EFAULT; | |
9671 | if (copy_from_user(p, arg, size)) | |
9672 | goto out; | |
9673 | ret = -EINVAL; | |
9674 | if (memchr_inv(p, 0, size)) | |
9675 | goto out; | |
9676 | ||
9677 | p->last_op = IORING_OP_LAST - 1; | |
9678 | if (nr_args > IORING_OP_LAST) | |
9679 | nr_args = IORING_OP_LAST; | |
9680 | ||
9681 | for (i = 0; i < nr_args; i++) { | |
9682 | p->ops[i].op = i; | |
9683 | if (!io_op_defs[i].not_supported) | |
9684 | p->ops[i].flags = IO_URING_OP_SUPPORTED; | |
9685 | } | |
9686 | p->ops_len = i; | |
9687 | ||
9688 | ret = 0; | |
9689 | if (copy_to_user(arg, p, size)) | |
9690 | ret = -EFAULT; | |
9691 | out: | |
9692 | kfree(p); | |
9693 | return ret; | |
9694 | } | |
9695 | ||
071698e1 JA |
9696 | static int io_register_personality(struct io_ring_ctx *ctx) |
9697 | { | |
1e6fa521 JA |
9698 | struct io_identity *id; |
9699 | int ret; | |
071698e1 | 9700 | |
1e6fa521 JA |
9701 | id = kmalloc(sizeof(*id), GFP_KERNEL); |
9702 | if (unlikely(!id)) | |
9703 | return -ENOMEM; | |
9704 | ||
9705 | io_init_identity(id); | |
9706 | id->creds = get_current_cred(); | |
9707 | ||
9708 | ret = idr_alloc_cyclic(&ctx->personality_idr, id, 1, USHRT_MAX, GFP_KERNEL); | |
9709 | if (ret < 0) { | |
9710 | put_cred(id->creds); | |
9711 | kfree(id); | |
9712 | } | |
9713 | return ret; | |
071698e1 JA |
9714 | } |
9715 | ||
9716 | static int io_unregister_personality(struct io_ring_ctx *ctx, unsigned id) | |
9717 | { | |
1e6fa521 | 9718 | struct io_identity *iod; |
071698e1 | 9719 | |
1e6fa521 JA |
9720 | iod = idr_remove(&ctx->personality_idr, id); |
9721 | if (iod) { | |
9722 | put_cred(iod->creds); | |
9723 | if (refcount_dec_and_test(&iod->count)) | |
9724 | kfree(iod); | |
071698e1 JA |
9725 | return 0; |
9726 | } | |
9727 | ||
9728 | return -EINVAL; | |
9729 | } | |
9730 | ||
21b55dbc SG |
9731 | static int io_register_restrictions(struct io_ring_ctx *ctx, void __user *arg, |
9732 | unsigned int nr_args) | |
9733 | { | |
9734 | struct io_uring_restriction *res; | |
9735 | size_t size; | |
9736 | int i, ret; | |
9737 | ||
7e84e1c7 SG |
9738 | /* Restrictions allowed only if rings started disabled */ |
9739 | if (!(ctx->flags & IORING_SETUP_R_DISABLED)) | |
9740 | return -EBADFD; | |
9741 | ||
21b55dbc | 9742 | /* We allow only a single restrictions registration */ |
7e84e1c7 | 9743 | if (ctx->restrictions.registered) |
21b55dbc SG |
9744 | return -EBUSY; |
9745 | ||
9746 | if (!arg || nr_args > IORING_MAX_RESTRICTIONS) | |
9747 | return -EINVAL; | |
9748 | ||
9749 | size = array_size(nr_args, sizeof(*res)); | |
9750 | if (size == SIZE_MAX) | |
9751 | return -EOVERFLOW; | |
9752 | ||
9753 | res = memdup_user(arg, size); | |
9754 | if (IS_ERR(res)) | |
9755 | return PTR_ERR(res); | |
9756 | ||
9757 | ret = 0; | |
9758 | ||
9759 | for (i = 0; i < nr_args; i++) { | |
9760 | switch (res[i].opcode) { | |
9761 | case IORING_RESTRICTION_REGISTER_OP: | |
9762 | if (res[i].register_op >= IORING_REGISTER_LAST) { | |
9763 | ret = -EINVAL; | |
9764 | goto out; | |
9765 | } | |
9766 | ||
9767 | __set_bit(res[i].register_op, | |
9768 | ctx->restrictions.register_op); | |
9769 | break; | |
9770 | case IORING_RESTRICTION_SQE_OP: | |
9771 | if (res[i].sqe_op >= IORING_OP_LAST) { | |
9772 | ret = -EINVAL; | |
9773 | goto out; | |
9774 | } | |
9775 | ||
9776 | __set_bit(res[i].sqe_op, ctx->restrictions.sqe_op); | |
9777 | break; | |
9778 | case IORING_RESTRICTION_SQE_FLAGS_ALLOWED: | |
9779 | ctx->restrictions.sqe_flags_allowed = res[i].sqe_flags; | |
9780 | break; | |
9781 | case IORING_RESTRICTION_SQE_FLAGS_REQUIRED: | |
9782 | ctx->restrictions.sqe_flags_required = res[i].sqe_flags; | |
9783 | break; | |
9784 | default: | |
9785 | ret = -EINVAL; | |
9786 | goto out; | |
9787 | } | |
9788 | } | |
9789 | ||
9790 | out: | |
9791 | /* Reset all restrictions if an error happened */ | |
9792 | if (ret != 0) | |
9793 | memset(&ctx->restrictions, 0, sizeof(ctx->restrictions)); | |
9794 | else | |
7e84e1c7 | 9795 | ctx->restrictions.registered = true; |
21b55dbc SG |
9796 | |
9797 | kfree(res); | |
9798 | return ret; | |
9799 | } | |
9800 | ||
7e84e1c7 SG |
9801 | static int io_register_enable_rings(struct io_ring_ctx *ctx) |
9802 | { | |
9803 | if (!(ctx->flags & IORING_SETUP_R_DISABLED)) | |
9804 | return -EBADFD; | |
9805 | ||
9806 | if (ctx->restrictions.registered) | |
9807 | ctx->restricted = 1; | |
9808 | ||
9809 | ctx->flags &= ~IORING_SETUP_R_DISABLED; | |
9810 | ||
9811 | io_sq_offload_start(ctx); | |
9812 | ||
9813 | return 0; | |
9814 | } | |
9815 | ||
071698e1 JA |
9816 | static bool io_register_op_must_quiesce(int op) |
9817 | { | |
9818 | switch (op) { | |
9819 | case IORING_UNREGISTER_FILES: | |
9820 | case IORING_REGISTER_FILES_UPDATE: | |
9821 | case IORING_REGISTER_PROBE: | |
9822 | case IORING_REGISTER_PERSONALITY: | |
9823 | case IORING_UNREGISTER_PERSONALITY: | |
9824 | return false; | |
9825 | default: | |
9826 | return true; | |
9827 | } | |
9828 | } | |
9829 | ||
edafccee JA |
9830 | static int __io_uring_register(struct io_ring_ctx *ctx, unsigned opcode, |
9831 | void __user *arg, unsigned nr_args) | |
b19062a5 JA |
9832 | __releases(ctx->uring_lock) |
9833 | __acquires(ctx->uring_lock) | |
edafccee JA |
9834 | { |
9835 | int ret; | |
9836 | ||
35fa71a0 JA |
9837 | /* |
9838 | * We're inside the ring mutex, if the ref is already dying, then | |
9839 | * someone else killed the ctx or is already going through | |
9840 | * io_uring_register(). | |
9841 | */ | |
9842 | if (percpu_ref_is_dying(&ctx->refs)) | |
9843 | return -ENXIO; | |
9844 | ||
071698e1 | 9845 | if (io_register_op_must_quiesce(opcode)) { |
05f3fb3c | 9846 | percpu_ref_kill(&ctx->refs); |
b19062a5 | 9847 | |
05f3fb3c JA |
9848 | /* |
9849 | * Drop uring mutex before waiting for references to exit. If | |
9850 | * another thread is currently inside io_uring_enter() it might | |
9851 | * need to grab the uring_lock to make progress. If we hold it | |
9852 | * here across the drain wait, then we can deadlock. It's safe | |
9853 | * to drop the mutex here, since no new references will come in | |
9854 | * after we've killed the percpu ref. | |
9855 | */ | |
9856 | mutex_unlock(&ctx->uring_lock); | |
af9c1a44 JA |
9857 | do { |
9858 | ret = wait_for_completion_interruptible(&ctx->ref_comp); | |
9859 | if (!ret) | |
9860 | break; | |
ed6930c9 JA |
9861 | ret = io_run_task_work_sig(); |
9862 | if (ret < 0) | |
9863 | break; | |
af9c1a44 JA |
9864 | } while (1); |
9865 | ||
05f3fb3c | 9866 | mutex_lock(&ctx->uring_lock); |
af9c1a44 | 9867 | |
c150368b JA |
9868 | if (ret) { |
9869 | percpu_ref_resurrect(&ctx->refs); | |
21b55dbc SG |
9870 | goto out_quiesce; |
9871 | } | |
9872 | } | |
9873 | ||
9874 | if (ctx->restricted) { | |
9875 | if (opcode >= IORING_REGISTER_LAST) { | |
9876 | ret = -EINVAL; | |
9877 | goto out; | |
9878 | } | |
9879 | ||
9880 | if (!test_bit(opcode, ctx->restrictions.register_op)) { | |
9881 | ret = -EACCES; | |
c150368b JA |
9882 | goto out; |
9883 | } | |
05f3fb3c | 9884 | } |
edafccee JA |
9885 | |
9886 | switch (opcode) { | |
9887 | case IORING_REGISTER_BUFFERS: | |
9888 | ret = io_sqe_buffer_register(ctx, arg, nr_args); | |
9889 | break; | |
9890 | case IORING_UNREGISTER_BUFFERS: | |
9891 | ret = -EINVAL; | |
9892 | if (arg || nr_args) | |
9893 | break; | |
9894 | ret = io_sqe_buffer_unregister(ctx); | |
9895 | break; | |
6b06314c JA |
9896 | case IORING_REGISTER_FILES: |
9897 | ret = io_sqe_files_register(ctx, arg, nr_args); | |
9898 | break; | |
9899 | case IORING_UNREGISTER_FILES: | |
9900 | ret = -EINVAL; | |
9901 | if (arg || nr_args) | |
9902 | break; | |
9903 | ret = io_sqe_files_unregister(ctx); | |
9904 | break; | |
c3a31e60 JA |
9905 | case IORING_REGISTER_FILES_UPDATE: |
9906 | ret = io_sqe_files_update(ctx, arg, nr_args); | |
9907 | break; | |
9b402849 | 9908 | case IORING_REGISTER_EVENTFD: |
f2842ab5 | 9909 | case IORING_REGISTER_EVENTFD_ASYNC: |
9b402849 JA |
9910 | ret = -EINVAL; |
9911 | if (nr_args != 1) | |
9912 | break; | |
9913 | ret = io_eventfd_register(ctx, arg); | |
f2842ab5 JA |
9914 | if (ret) |
9915 | break; | |
9916 | if (opcode == IORING_REGISTER_EVENTFD_ASYNC) | |
9917 | ctx->eventfd_async = 1; | |
9918 | else | |
9919 | ctx->eventfd_async = 0; | |
9b402849 JA |
9920 | break; |
9921 | case IORING_UNREGISTER_EVENTFD: | |
9922 | ret = -EINVAL; | |
9923 | if (arg || nr_args) | |
9924 | break; | |
9925 | ret = io_eventfd_unregister(ctx); | |
9926 | break; | |
66f4af93 JA |
9927 | case IORING_REGISTER_PROBE: |
9928 | ret = -EINVAL; | |
9929 | if (!arg || nr_args > 256) | |
9930 | break; | |
9931 | ret = io_probe(ctx, arg, nr_args); | |
9932 | break; | |
071698e1 JA |
9933 | case IORING_REGISTER_PERSONALITY: |
9934 | ret = -EINVAL; | |
9935 | if (arg || nr_args) | |
9936 | break; | |
9937 | ret = io_register_personality(ctx); | |
9938 | break; | |
9939 | case IORING_UNREGISTER_PERSONALITY: | |
9940 | ret = -EINVAL; | |
9941 | if (arg) | |
9942 | break; | |
9943 | ret = io_unregister_personality(ctx, nr_args); | |
9944 | break; | |
7e84e1c7 SG |
9945 | case IORING_REGISTER_ENABLE_RINGS: |
9946 | ret = -EINVAL; | |
9947 | if (arg || nr_args) | |
9948 | break; | |
9949 | ret = io_register_enable_rings(ctx); | |
9950 | break; | |
21b55dbc SG |
9951 | case IORING_REGISTER_RESTRICTIONS: |
9952 | ret = io_register_restrictions(ctx, arg, nr_args); | |
9953 | break; | |
edafccee JA |
9954 | default: |
9955 | ret = -EINVAL; | |
9956 | break; | |
9957 | } | |
9958 | ||
21b55dbc | 9959 | out: |
071698e1 | 9960 | if (io_register_op_must_quiesce(opcode)) { |
05f3fb3c | 9961 | /* bring the ctx back to life */ |
05f3fb3c | 9962 | percpu_ref_reinit(&ctx->refs); |
21b55dbc | 9963 | out_quiesce: |
0f158b4c | 9964 | reinit_completion(&ctx->ref_comp); |
05f3fb3c | 9965 | } |
edafccee JA |
9966 | return ret; |
9967 | } | |
9968 | ||
9969 | SYSCALL_DEFINE4(io_uring_register, unsigned int, fd, unsigned int, opcode, | |
9970 | void __user *, arg, unsigned int, nr_args) | |
9971 | { | |
9972 | struct io_ring_ctx *ctx; | |
9973 | long ret = -EBADF; | |
9974 | struct fd f; | |
9975 | ||
9976 | f = fdget(fd); | |
9977 | if (!f.file) | |
9978 | return -EBADF; | |
9979 | ||
9980 | ret = -EOPNOTSUPP; | |
9981 | if (f.file->f_op != &io_uring_fops) | |
9982 | goto out_fput; | |
9983 | ||
9984 | ctx = f.file->private_data; | |
9985 | ||
9986 | mutex_lock(&ctx->uring_lock); | |
9987 | ret = __io_uring_register(ctx, opcode, arg, nr_args); | |
9988 | mutex_unlock(&ctx->uring_lock); | |
c826bd7a DD |
9989 | trace_io_uring_register(ctx, opcode, ctx->nr_user_files, ctx->nr_user_bufs, |
9990 | ctx->cq_ev_fd != NULL, ret); | |
edafccee JA |
9991 | out_fput: |
9992 | fdput(f); | |
9993 | return ret; | |
9994 | } | |
9995 | ||
2b188cc1 JA |
9996 | static int __init io_uring_init(void) |
9997 | { | |
d7f62e82 SM |
9998 | #define __BUILD_BUG_VERIFY_ELEMENT(stype, eoffset, etype, ename) do { \ |
9999 | BUILD_BUG_ON(offsetof(stype, ename) != eoffset); \ | |
10000 | BUILD_BUG_ON(sizeof(etype) != sizeof_field(stype, ename)); \ | |
10001 | } while (0) | |
10002 | ||
10003 | #define BUILD_BUG_SQE_ELEM(eoffset, etype, ename) \ | |
10004 | __BUILD_BUG_VERIFY_ELEMENT(struct io_uring_sqe, eoffset, etype, ename) | |
10005 | BUILD_BUG_ON(sizeof(struct io_uring_sqe) != 64); | |
10006 | BUILD_BUG_SQE_ELEM(0, __u8, opcode); | |
10007 | BUILD_BUG_SQE_ELEM(1, __u8, flags); | |
10008 | BUILD_BUG_SQE_ELEM(2, __u16, ioprio); | |
10009 | BUILD_BUG_SQE_ELEM(4, __s32, fd); | |
10010 | BUILD_BUG_SQE_ELEM(8, __u64, off); | |
10011 | BUILD_BUG_SQE_ELEM(8, __u64, addr2); | |
10012 | BUILD_BUG_SQE_ELEM(16, __u64, addr); | |
7d67af2c | 10013 | BUILD_BUG_SQE_ELEM(16, __u64, splice_off_in); |
d7f62e82 SM |
10014 | BUILD_BUG_SQE_ELEM(24, __u32, len); |
10015 | BUILD_BUG_SQE_ELEM(28, __kernel_rwf_t, rw_flags); | |
10016 | BUILD_BUG_SQE_ELEM(28, /* compat */ int, rw_flags); | |
10017 | BUILD_BUG_SQE_ELEM(28, /* compat */ __u32, rw_flags); | |
10018 | BUILD_BUG_SQE_ELEM(28, __u32, fsync_flags); | |
5769a351 JX |
10019 | BUILD_BUG_SQE_ELEM(28, /* compat */ __u16, poll_events); |
10020 | BUILD_BUG_SQE_ELEM(28, __u32, poll32_events); | |
d7f62e82 SM |
10021 | BUILD_BUG_SQE_ELEM(28, __u32, sync_range_flags); |
10022 | BUILD_BUG_SQE_ELEM(28, __u32, msg_flags); | |
10023 | BUILD_BUG_SQE_ELEM(28, __u32, timeout_flags); | |
10024 | BUILD_BUG_SQE_ELEM(28, __u32, accept_flags); | |
10025 | BUILD_BUG_SQE_ELEM(28, __u32, cancel_flags); | |
10026 | BUILD_BUG_SQE_ELEM(28, __u32, open_flags); | |
10027 | BUILD_BUG_SQE_ELEM(28, __u32, statx_flags); | |
10028 | BUILD_BUG_SQE_ELEM(28, __u32, fadvise_advice); | |
7d67af2c | 10029 | BUILD_BUG_SQE_ELEM(28, __u32, splice_flags); |
d7f62e82 SM |
10030 | BUILD_BUG_SQE_ELEM(32, __u64, user_data); |
10031 | BUILD_BUG_SQE_ELEM(40, __u16, buf_index); | |
10032 | BUILD_BUG_SQE_ELEM(42, __u16, personality); | |
7d67af2c | 10033 | BUILD_BUG_SQE_ELEM(44, __s32, splice_fd_in); |
d7f62e82 | 10034 | |
d3656344 | 10035 | BUILD_BUG_ON(ARRAY_SIZE(io_op_defs) != IORING_OP_LAST); |
84557871 | 10036 | BUILD_BUG_ON(__REQ_F_LAST_BIT >= 8 * sizeof(int)); |
2b188cc1 JA |
10037 | req_cachep = KMEM_CACHE(io_kiocb, SLAB_HWCACHE_ALIGN | SLAB_PANIC); |
10038 | return 0; | |
10039 | }; | |
10040 | __initcall(io_uring_init); |