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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; | |
08369246 XW |
248 | |
249 | unsigned sq_thread_idle; | |
534ca6d6 JA |
250 | }; |
251 | ||
2b188cc1 JA |
252 | struct io_ring_ctx { |
253 | struct { | |
254 | struct percpu_ref refs; | |
255 | } ____cacheline_aligned_in_smp; | |
256 | ||
257 | struct { | |
258 | unsigned int flags; | |
e1d85334 | 259 | unsigned int compat: 1; |
aad5d8da | 260 | unsigned int limit_mem: 1; |
e1d85334 RD |
261 | unsigned int cq_overflow_flushed: 1; |
262 | unsigned int drain_next: 1; | |
263 | unsigned int eventfd_async: 1; | |
21b55dbc | 264 | unsigned int restricted: 1; |
2b188cc1 | 265 | |
75b28aff HV |
266 | /* |
267 | * Ring buffer of indices into array of io_uring_sqe, which is | |
268 | * mmapped by the application using the IORING_OFF_SQES offset. | |
269 | * | |
270 | * This indirection could e.g. be used to assign fixed | |
271 | * io_uring_sqe entries to operations and only submit them to | |
272 | * the queue when needed. | |
273 | * | |
274 | * The kernel modifies neither the indices array nor the entries | |
275 | * array. | |
276 | */ | |
277 | u32 *sq_array; | |
2b188cc1 JA |
278 | unsigned cached_sq_head; |
279 | unsigned sq_entries; | |
280 | unsigned sq_mask; | |
6c271ce2 | 281 | unsigned sq_thread_idle; |
498ccd9e | 282 | unsigned cached_sq_dropped; |
2c3bac6d | 283 | unsigned cached_cq_overflow; |
ad3eb2c8 | 284 | unsigned long sq_check_overflow; |
de0617e4 JA |
285 | |
286 | struct list_head defer_list; | |
5262f567 | 287 | struct list_head timeout_list; |
1d7bb1d5 | 288 | struct list_head cq_overflow_list; |
fcb323cc | 289 | |
ad3eb2c8 | 290 | struct io_uring_sqe *sq_sqes; |
2b188cc1 JA |
291 | } ____cacheline_aligned_in_smp; |
292 | ||
206aefde JA |
293 | struct io_rings *rings; |
294 | ||
2b188cc1 | 295 | /* IO offload */ |
561fb04a | 296 | struct io_wq *io_wq; |
2aede0e4 JA |
297 | |
298 | /* | |
299 | * For SQPOLL usage - we hold a reference to the parent task, so we | |
300 | * have access to the ->files | |
301 | */ | |
302 | struct task_struct *sqo_task; | |
303 | ||
304 | /* Only used for accounting purposes */ | |
305 | struct mm_struct *mm_account; | |
306 | ||
91d8f519 DZ |
307 | #ifdef CONFIG_BLK_CGROUP |
308 | struct cgroup_subsys_state *sqo_blkcg_css; | |
309 | #endif | |
310 | ||
534ca6d6 JA |
311 | struct io_sq_data *sq_data; /* if using sq thread polling */ |
312 | ||
90554200 | 313 | struct wait_queue_head sqo_sq_wait; |
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; | |
018043be | 398 | struct wait_queue_head *head; |
221c5eb2 | 399 | __poll_t events; |
8c838788 | 400 | bool done; |
221c5eb2 | 401 | bool canceled; |
392edb45 | 402 | struct wait_queue_entry wait; |
221c5eb2 JA |
403 | }; |
404 | ||
018043be PB |
405 | struct io_poll_remove { |
406 | struct file *file; | |
407 | u64 addr; | |
408 | }; | |
409 | ||
b5dba59e JA |
410 | struct io_close { |
411 | struct file *file; | |
412 | struct file *put_file; | |
413 | int fd; | |
414 | }; | |
415 | ||
ad8a48ac JA |
416 | struct io_timeout_data { |
417 | struct io_kiocb *req; | |
418 | struct hrtimer timer; | |
419 | struct timespec64 ts; | |
420 | enum hrtimer_mode mode; | |
421 | }; | |
422 | ||
8ed8d3c3 JA |
423 | struct io_accept { |
424 | struct file *file; | |
425 | struct sockaddr __user *addr; | |
426 | int __user *addr_len; | |
427 | int flags; | |
09952e3e | 428 | unsigned long nofile; |
8ed8d3c3 JA |
429 | }; |
430 | ||
431 | struct io_sync { | |
432 | struct file *file; | |
433 | loff_t len; | |
434 | loff_t off; | |
435 | int flags; | |
d63d1b5e | 436 | int mode; |
8ed8d3c3 JA |
437 | }; |
438 | ||
fbf23849 JA |
439 | struct io_cancel { |
440 | struct file *file; | |
441 | u64 addr; | |
442 | }; | |
443 | ||
b29472ee JA |
444 | struct io_timeout { |
445 | struct file *file; | |
bfe68a22 PB |
446 | u32 off; |
447 | u32 target_seq; | |
135fcde8 | 448 | struct list_head list; |
90cd7e42 PB |
449 | /* head of the link, used by linked timeouts only */ |
450 | struct io_kiocb *head; | |
b29472ee JA |
451 | }; |
452 | ||
0bdf7a2d PB |
453 | struct io_timeout_rem { |
454 | struct file *file; | |
455 | u64 addr; | |
456 | }; | |
457 | ||
9adbd45d JA |
458 | struct io_rw { |
459 | /* NOTE: kiocb has the file as the first member, so don't do it here */ | |
460 | struct kiocb kiocb; | |
461 | u64 addr; | |
462 | u64 len; | |
463 | }; | |
464 | ||
3fbb51c1 JA |
465 | struct io_connect { |
466 | struct file *file; | |
467 | struct sockaddr __user *addr; | |
468 | int addr_len; | |
469 | }; | |
470 | ||
e47293fd JA |
471 | struct io_sr_msg { |
472 | struct file *file; | |
fddaface | 473 | union { |
270a5940 | 474 | struct user_msghdr __user *umsg; |
fddaface JA |
475 | void __user *buf; |
476 | }; | |
e47293fd | 477 | int msg_flags; |
bcda7baa | 478 | int bgid; |
fddaface | 479 | size_t len; |
bcda7baa | 480 | struct io_buffer *kbuf; |
e47293fd JA |
481 | }; |
482 | ||
15b71abe JA |
483 | struct io_open { |
484 | struct file *file; | |
485 | int dfd; | |
944d1444 | 486 | bool ignore_nonblock; |
15b71abe | 487 | struct filename *filename; |
c12cedf2 | 488 | struct open_how how; |
4022e7af | 489 | unsigned long nofile; |
15b71abe JA |
490 | }; |
491 | ||
05f3fb3c JA |
492 | struct io_files_update { |
493 | struct file *file; | |
494 | u64 arg; | |
495 | u32 nr_args; | |
496 | u32 offset; | |
497 | }; | |
498 | ||
4840e418 JA |
499 | struct io_fadvise { |
500 | struct file *file; | |
501 | u64 offset; | |
502 | u32 len; | |
503 | u32 advice; | |
504 | }; | |
505 | ||
c1ca757b JA |
506 | struct io_madvise { |
507 | struct file *file; | |
508 | u64 addr; | |
509 | u32 len; | |
510 | u32 advice; | |
511 | }; | |
512 | ||
3e4827b0 JA |
513 | struct io_epoll { |
514 | struct file *file; | |
515 | int epfd; | |
516 | int op; | |
517 | int fd; | |
518 | struct epoll_event event; | |
e47293fd JA |
519 | }; |
520 | ||
7d67af2c PB |
521 | struct io_splice { |
522 | struct file *file_out; | |
523 | struct file *file_in; | |
524 | loff_t off_out; | |
525 | loff_t off_in; | |
526 | u64 len; | |
527 | unsigned int flags; | |
528 | }; | |
529 | ||
ddf0322d JA |
530 | struct io_provide_buf { |
531 | struct file *file; | |
532 | __u64 addr; | |
533 | __s32 len; | |
534 | __u32 bgid; | |
535 | __u16 nbufs; | |
536 | __u16 bid; | |
537 | }; | |
538 | ||
1d9e1288 BM |
539 | struct io_statx { |
540 | struct file *file; | |
541 | int dfd; | |
542 | unsigned int mask; | |
543 | unsigned int flags; | |
e62753e4 | 544 | const char __user *filename; |
1d9e1288 BM |
545 | struct statx __user *buffer; |
546 | }; | |
547 | ||
36f4fa68 JA |
548 | struct io_shutdown { |
549 | struct file *file; | |
550 | int how; | |
551 | }; | |
552 | ||
80a261fd JA |
553 | struct io_rename { |
554 | struct file *file; | |
555 | int old_dfd; | |
556 | int new_dfd; | |
557 | struct filename *oldpath; | |
558 | struct filename *newpath; | |
559 | int flags; | |
560 | }; | |
561 | ||
14a1143b JA |
562 | struct io_unlink { |
563 | struct file *file; | |
564 | int dfd; | |
565 | int flags; | |
566 | struct filename *filename; | |
567 | }; | |
568 | ||
3ca405eb PB |
569 | struct io_completion { |
570 | struct file *file; | |
571 | struct list_head list; | |
0f7e466b | 572 | int cflags; |
3ca405eb PB |
573 | }; |
574 | ||
f499a021 JA |
575 | struct io_async_connect { |
576 | struct sockaddr_storage address; | |
577 | }; | |
578 | ||
03b1230c JA |
579 | struct io_async_msghdr { |
580 | struct iovec fast_iov[UIO_FASTIOV]; | |
581 | struct iovec *iov; | |
582 | struct sockaddr __user *uaddr; | |
583 | struct msghdr msg; | |
b537916c | 584 | struct sockaddr_storage addr; |
03b1230c JA |
585 | }; |
586 | ||
f67676d1 JA |
587 | struct io_async_rw { |
588 | struct iovec fast_iov[UIO_FASTIOV]; | |
ff6165b2 JA |
589 | const struct iovec *free_iovec; |
590 | struct iov_iter iter; | |
227c0c96 | 591 | size_t bytes_done; |
bcf5a063 | 592 | struct wait_page_queue wpq; |
f67676d1 JA |
593 | }; |
594 | ||
6b47ee6e PB |
595 | enum { |
596 | REQ_F_FIXED_FILE_BIT = IOSQE_FIXED_FILE_BIT, | |
597 | REQ_F_IO_DRAIN_BIT = IOSQE_IO_DRAIN_BIT, | |
598 | REQ_F_LINK_BIT = IOSQE_IO_LINK_BIT, | |
599 | REQ_F_HARDLINK_BIT = IOSQE_IO_HARDLINK_BIT, | |
600 | REQ_F_FORCE_ASYNC_BIT = IOSQE_ASYNC_BIT, | |
bcda7baa | 601 | REQ_F_BUFFER_SELECT_BIT = IOSQE_BUFFER_SELECT_BIT, |
6b47ee6e | 602 | |
6b47ee6e PB |
603 | REQ_F_FAIL_LINK_BIT, |
604 | REQ_F_INFLIGHT_BIT, | |
605 | REQ_F_CUR_POS_BIT, | |
606 | REQ_F_NOWAIT_BIT, | |
6b47ee6e | 607 | REQ_F_LINK_TIMEOUT_BIT, |
6b47ee6e | 608 | REQ_F_ISREG_BIT, |
99bc4c38 | 609 | REQ_F_NEED_CLEANUP_BIT, |
d7718a9d | 610 | REQ_F_POLLED_BIT, |
bcda7baa | 611 | REQ_F_BUFFER_SELECTED_BIT, |
5b0bbee4 | 612 | REQ_F_NO_FILE_TABLE_BIT, |
7cdaf587 | 613 | REQ_F_WORK_INITIALIZED_BIT, |
900fad45 | 614 | REQ_F_LTIMEOUT_ACTIVE_BIT, |
84557871 JA |
615 | |
616 | /* not a real bit, just to check we're not overflowing the space */ | |
617 | __REQ_F_LAST_BIT, | |
6b47ee6e PB |
618 | }; |
619 | ||
620 | enum { | |
621 | /* ctx owns file */ | |
622 | REQ_F_FIXED_FILE = BIT(REQ_F_FIXED_FILE_BIT), | |
623 | /* drain existing IO first */ | |
624 | REQ_F_IO_DRAIN = BIT(REQ_F_IO_DRAIN_BIT), | |
625 | /* linked sqes */ | |
626 | REQ_F_LINK = BIT(REQ_F_LINK_BIT), | |
627 | /* doesn't sever on completion < 0 */ | |
628 | REQ_F_HARDLINK = BIT(REQ_F_HARDLINK_BIT), | |
629 | /* IOSQE_ASYNC */ | |
630 | REQ_F_FORCE_ASYNC = BIT(REQ_F_FORCE_ASYNC_BIT), | |
bcda7baa JA |
631 | /* IOSQE_BUFFER_SELECT */ |
632 | REQ_F_BUFFER_SELECT = BIT(REQ_F_BUFFER_SELECT_BIT), | |
6b47ee6e | 633 | |
6b47ee6e PB |
634 | /* fail rest of links */ |
635 | REQ_F_FAIL_LINK = BIT(REQ_F_FAIL_LINK_BIT), | |
636 | /* on inflight list */ | |
637 | REQ_F_INFLIGHT = BIT(REQ_F_INFLIGHT_BIT), | |
638 | /* read/write uses file position */ | |
639 | REQ_F_CUR_POS = BIT(REQ_F_CUR_POS_BIT), | |
640 | /* must not punt to workers */ | |
641 | REQ_F_NOWAIT = BIT(REQ_F_NOWAIT_BIT), | |
900fad45 | 642 | /* has or had linked timeout */ |
6b47ee6e | 643 | REQ_F_LINK_TIMEOUT = BIT(REQ_F_LINK_TIMEOUT_BIT), |
6b47ee6e PB |
644 | /* regular file */ |
645 | REQ_F_ISREG = BIT(REQ_F_ISREG_BIT), | |
99bc4c38 PB |
646 | /* needs cleanup */ |
647 | REQ_F_NEED_CLEANUP = BIT(REQ_F_NEED_CLEANUP_BIT), | |
d7718a9d JA |
648 | /* already went through poll handler */ |
649 | REQ_F_POLLED = BIT(REQ_F_POLLED_BIT), | |
bcda7baa JA |
650 | /* buffer already selected */ |
651 | REQ_F_BUFFER_SELECTED = BIT(REQ_F_BUFFER_SELECTED_BIT), | |
5b0bbee4 JA |
652 | /* doesn't need file table for this request */ |
653 | REQ_F_NO_FILE_TABLE = BIT(REQ_F_NO_FILE_TABLE_BIT), | |
7cdaf587 XW |
654 | /* io_wq_work is initialized */ |
655 | REQ_F_WORK_INITIALIZED = BIT(REQ_F_WORK_INITIALIZED_BIT), | |
900fad45 PB |
656 | /* linked timeout is active, i.e. prepared by link's head */ |
657 | REQ_F_LTIMEOUT_ACTIVE = BIT(REQ_F_LTIMEOUT_ACTIVE_BIT), | |
d7718a9d JA |
658 | }; |
659 | ||
660 | struct async_poll { | |
661 | struct io_poll_iocb poll; | |
807abcb0 | 662 | struct io_poll_iocb *double_poll; |
6b47ee6e PB |
663 | }; |
664 | ||
09bb8394 JA |
665 | /* |
666 | * NOTE! Each of the iocb union members has the file pointer | |
667 | * as the first entry in their struct definition. So you can | |
668 | * access the file pointer through any of the sub-structs, | |
669 | * or directly as just 'ki_filp' in this struct. | |
670 | */ | |
2b188cc1 | 671 | struct io_kiocb { |
221c5eb2 | 672 | union { |
09bb8394 | 673 | struct file *file; |
9adbd45d | 674 | struct io_rw rw; |
221c5eb2 | 675 | struct io_poll_iocb poll; |
018043be | 676 | struct io_poll_remove poll_remove; |
8ed8d3c3 JA |
677 | struct io_accept accept; |
678 | struct io_sync sync; | |
fbf23849 | 679 | struct io_cancel cancel; |
b29472ee | 680 | struct io_timeout timeout; |
0bdf7a2d | 681 | struct io_timeout_rem timeout_rem; |
3fbb51c1 | 682 | struct io_connect connect; |
e47293fd | 683 | struct io_sr_msg sr_msg; |
15b71abe | 684 | struct io_open open; |
b5dba59e | 685 | struct io_close close; |
05f3fb3c | 686 | struct io_files_update files_update; |
4840e418 | 687 | struct io_fadvise fadvise; |
c1ca757b | 688 | struct io_madvise madvise; |
3e4827b0 | 689 | struct io_epoll epoll; |
7d67af2c | 690 | struct io_splice splice; |
ddf0322d | 691 | struct io_provide_buf pbuf; |
1d9e1288 | 692 | struct io_statx statx; |
36f4fa68 | 693 | struct io_shutdown shutdown; |
80a261fd | 694 | struct io_rename rename; |
14a1143b | 695 | struct io_unlink unlink; |
3ca405eb PB |
696 | /* use only after cleaning per-op data, see io_clean_op() */ |
697 | struct io_completion compl; | |
221c5eb2 | 698 | }; |
2b188cc1 | 699 | |
e8c2bc1f JA |
700 | /* opcode allocated if it needs to store data for async defer */ |
701 | void *async_data; | |
d625c6ee | 702 | u8 opcode; |
65a6543d XW |
703 | /* polled IO has completed */ |
704 | u8 iopoll_completed; | |
2b188cc1 | 705 | |
4f4eeba8 | 706 | u16 buf_index; |
9cf7c104 | 707 | u32 result; |
4f4eeba8 | 708 | |
010e8e6b PB |
709 | struct io_ring_ctx *ctx; |
710 | unsigned int flags; | |
711 | refcount_t refs; | |
712 | struct task_struct *task; | |
713 | u64 user_data; | |
d7718a9d | 714 | |
f2f87370 | 715 | struct io_kiocb *link; |
0415767e | 716 | struct percpu_ref *fixed_file_refs; |
fcb323cc | 717 | |
d21ffe7e PB |
718 | /* |
719 | * 1. used with ctx->iopoll_list with reads/writes | |
720 | * 2. to track reqs with ->files (see io_op_def::file_table) | |
721 | */ | |
010e8e6b | 722 | struct list_head inflight_entry; |
010e8e6b PB |
723 | struct callback_head task_work; |
724 | /* for polled requests, i.e. IORING_OP_POLL_ADD and async armed poll */ | |
725 | struct hlist_node hash_node; | |
726 | struct async_poll *apoll; | |
727 | struct io_wq_work work; | |
2b188cc1 | 728 | }; |
05589553 | 729 | |
27dc8338 PB |
730 | struct io_defer_entry { |
731 | struct list_head list; | |
732 | struct io_kiocb *req; | |
9cf7c104 | 733 | u32 seq; |
2b188cc1 JA |
734 | }; |
735 | ||
def596e9 | 736 | #define IO_IOPOLL_BATCH 8 |
2b188cc1 | 737 | |
013538bd JA |
738 | struct io_comp_state { |
739 | unsigned int nr; | |
740 | struct list_head list; | |
741 | struct io_ring_ctx *ctx; | |
742 | }; | |
743 | ||
9a56a232 JA |
744 | struct io_submit_state { |
745 | struct blk_plug plug; | |
746 | ||
2579f913 JA |
747 | /* |
748 | * io_kiocb alloc cache | |
749 | */ | |
750 | void *reqs[IO_IOPOLL_BATCH]; | |
6c8a3134 | 751 | unsigned int free_reqs; |
2579f913 | 752 | |
27926b68 JA |
753 | bool plug_started; |
754 | ||
013538bd JA |
755 | /* |
756 | * Batch completion logic | |
757 | */ | |
758 | struct io_comp_state comp; | |
759 | ||
9a56a232 JA |
760 | /* |
761 | * File reference cache | |
762 | */ | |
763 | struct file *file; | |
764 | unsigned int fd; | |
765 | unsigned int has_refs; | |
9a56a232 JA |
766 | unsigned int ios_left; |
767 | }; | |
768 | ||
d3656344 | 769 | struct io_op_def { |
d3656344 JA |
770 | /* needs req->file assigned */ |
771 | unsigned needs_file : 1; | |
fd2206e4 JA |
772 | /* don't fail if file grab fails */ |
773 | unsigned needs_file_no_error : 1; | |
d3656344 JA |
774 | /* hash wq insertion if file is a regular file */ |
775 | unsigned hash_reg_file : 1; | |
776 | /* unbound wq insertion if file is a non-regular file */ | |
777 | unsigned unbound_nonreg_file : 1; | |
66f4af93 JA |
778 | /* opcode is not supported by this kernel */ |
779 | unsigned not_supported : 1; | |
8a72758c JA |
780 | /* set if opcode supports polled "wait" */ |
781 | unsigned pollin : 1; | |
782 | unsigned pollout : 1; | |
bcda7baa JA |
783 | /* op supports buffer selection */ |
784 | unsigned buffer_select : 1; | |
e8c2bc1f JA |
785 | /* must always have async data allocated */ |
786 | unsigned needs_async_data : 1; | |
27926b68 JA |
787 | /* should block plug */ |
788 | unsigned plug : 1; | |
e8c2bc1f JA |
789 | /* size of async data needed, if any */ |
790 | unsigned short async_size; | |
0f203765 | 791 | unsigned work_flags; |
d3656344 JA |
792 | }; |
793 | ||
0918682b | 794 | static const struct io_op_def io_op_defs[] = { |
0463b6c5 PB |
795 | [IORING_OP_NOP] = {}, |
796 | [IORING_OP_READV] = { | |
d3656344 JA |
797 | .needs_file = 1, |
798 | .unbound_nonreg_file = 1, | |
8a72758c | 799 | .pollin = 1, |
4d954c25 | 800 | .buffer_select = 1, |
e8c2bc1f | 801 | .needs_async_data = 1, |
27926b68 | 802 | .plug = 1, |
e8c2bc1f | 803 | .async_size = sizeof(struct io_async_rw), |
0f203765 | 804 | .work_flags = IO_WQ_WORK_MM | IO_WQ_WORK_BLKCG, |
d3656344 | 805 | }, |
0463b6c5 | 806 | [IORING_OP_WRITEV] = { |
d3656344 JA |
807 | .needs_file = 1, |
808 | .hash_reg_file = 1, | |
809 | .unbound_nonreg_file = 1, | |
8a72758c | 810 | .pollout = 1, |
e8c2bc1f | 811 | .needs_async_data = 1, |
27926b68 | 812 | .plug = 1, |
e8c2bc1f | 813 | .async_size = sizeof(struct io_async_rw), |
69228338 JA |
814 | .work_flags = IO_WQ_WORK_MM | IO_WQ_WORK_BLKCG | |
815 | IO_WQ_WORK_FSIZE, | |
d3656344 | 816 | }, |
0463b6c5 | 817 | [IORING_OP_FSYNC] = { |
d3656344 | 818 | .needs_file = 1, |
0f203765 | 819 | .work_flags = IO_WQ_WORK_BLKCG, |
d3656344 | 820 | }, |
0463b6c5 | 821 | [IORING_OP_READ_FIXED] = { |
d3656344 JA |
822 | .needs_file = 1, |
823 | .unbound_nonreg_file = 1, | |
8a72758c | 824 | .pollin = 1, |
27926b68 | 825 | .plug = 1, |
e8c2bc1f | 826 | .async_size = sizeof(struct io_async_rw), |
4017eb91 | 827 | .work_flags = IO_WQ_WORK_BLKCG | IO_WQ_WORK_MM, |
d3656344 | 828 | }, |
0463b6c5 | 829 | [IORING_OP_WRITE_FIXED] = { |
d3656344 JA |
830 | .needs_file = 1, |
831 | .hash_reg_file = 1, | |
832 | .unbound_nonreg_file = 1, | |
8a72758c | 833 | .pollout = 1, |
27926b68 | 834 | .plug = 1, |
e8c2bc1f | 835 | .async_size = sizeof(struct io_async_rw), |
4017eb91 JA |
836 | .work_flags = IO_WQ_WORK_BLKCG | IO_WQ_WORK_FSIZE | |
837 | IO_WQ_WORK_MM, | |
d3656344 | 838 | }, |
0463b6c5 | 839 | [IORING_OP_POLL_ADD] = { |
d3656344 JA |
840 | .needs_file = 1, |
841 | .unbound_nonreg_file = 1, | |
842 | }, | |
0463b6c5 PB |
843 | [IORING_OP_POLL_REMOVE] = {}, |
844 | [IORING_OP_SYNC_FILE_RANGE] = { | |
d3656344 | 845 | .needs_file = 1, |
0f203765 | 846 | .work_flags = IO_WQ_WORK_BLKCG, |
d3656344 | 847 | }, |
0463b6c5 | 848 | [IORING_OP_SENDMSG] = { |
d3656344 JA |
849 | .needs_file = 1, |
850 | .unbound_nonreg_file = 1, | |
8a72758c | 851 | .pollout = 1, |
e8c2bc1f JA |
852 | .needs_async_data = 1, |
853 | .async_size = sizeof(struct io_async_msghdr), | |
10cad2c4 | 854 | .work_flags = IO_WQ_WORK_MM | IO_WQ_WORK_BLKCG, |
d3656344 | 855 | }, |
0463b6c5 | 856 | [IORING_OP_RECVMSG] = { |
d3656344 JA |
857 | .needs_file = 1, |
858 | .unbound_nonreg_file = 1, | |
8a72758c | 859 | .pollin = 1, |
52de1fe1 | 860 | .buffer_select = 1, |
e8c2bc1f JA |
861 | .needs_async_data = 1, |
862 | .async_size = sizeof(struct io_async_msghdr), | |
10cad2c4 | 863 | .work_flags = IO_WQ_WORK_MM | IO_WQ_WORK_BLKCG, |
d3656344 | 864 | }, |
0463b6c5 | 865 | [IORING_OP_TIMEOUT] = { |
e8c2bc1f JA |
866 | .needs_async_data = 1, |
867 | .async_size = sizeof(struct io_timeout_data), | |
0f203765 | 868 | .work_flags = IO_WQ_WORK_MM, |
d3656344 | 869 | }, |
0463b6c5 PB |
870 | [IORING_OP_TIMEOUT_REMOVE] = {}, |
871 | [IORING_OP_ACCEPT] = { | |
d3656344 JA |
872 | .needs_file = 1, |
873 | .unbound_nonreg_file = 1, | |
8a72758c | 874 | .pollin = 1, |
0f203765 | 875 | .work_flags = IO_WQ_WORK_MM | IO_WQ_WORK_FILES, |
d3656344 | 876 | }, |
0463b6c5 PB |
877 | [IORING_OP_ASYNC_CANCEL] = {}, |
878 | [IORING_OP_LINK_TIMEOUT] = { | |
e8c2bc1f JA |
879 | .needs_async_data = 1, |
880 | .async_size = sizeof(struct io_timeout_data), | |
0f203765 | 881 | .work_flags = IO_WQ_WORK_MM, |
d3656344 | 882 | }, |
0463b6c5 | 883 | [IORING_OP_CONNECT] = { |
d3656344 JA |
884 | .needs_file = 1, |
885 | .unbound_nonreg_file = 1, | |
8a72758c | 886 | .pollout = 1, |
e8c2bc1f JA |
887 | .needs_async_data = 1, |
888 | .async_size = sizeof(struct io_async_connect), | |
0f203765 | 889 | .work_flags = IO_WQ_WORK_MM, |
d3656344 | 890 | }, |
0463b6c5 | 891 | [IORING_OP_FALLOCATE] = { |
d3656344 | 892 | .needs_file = 1, |
69228338 | 893 | .work_flags = IO_WQ_WORK_BLKCG | IO_WQ_WORK_FSIZE, |
d3656344 | 894 | }, |
0463b6c5 | 895 | [IORING_OP_OPENAT] = { |
0f203765 | 896 | .work_flags = IO_WQ_WORK_FILES | IO_WQ_WORK_BLKCG | |
14587a46 | 897 | IO_WQ_WORK_FS | IO_WQ_WORK_MM, |
d3656344 | 898 | }, |
0463b6c5 | 899 | [IORING_OP_CLOSE] = { |
fd2206e4 JA |
900 | .needs_file = 1, |
901 | .needs_file_no_error = 1, | |
0f203765 | 902 | .work_flags = IO_WQ_WORK_FILES | IO_WQ_WORK_BLKCG, |
d3656344 | 903 | }, |
0463b6c5 | 904 | [IORING_OP_FILES_UPDATE] = { |
0f203765 | 905 | .work_flags = IO_WQ_WORK_FILES | IO_WQ_WORK_MM, |
d3656344 | 906 | }, |
0463b6c5 | 907 | [IORING_OP_STATX] = { |
0f203765 JA |
908 | .work_flags = IO_WQ_WORK_FILES | IO_WQ_WORK_MM | |
909 | IO_WQ_WORK_FS | IO_WQ_WORK_BLKCG, | |
d3656344 | 910 | }, |
0463b6c5 | 911 | [IORING_OP_READ] = { |
3a6820f2 JA |
912 | .needs_file = 1, |
913 | .unbound_nonreg_file = 1, | |
8a72758c | 914 | .pollin = 1, |
bcda7baa | 915 | .buffer_select = 1, |
27926b68 | 916 | .plug = 1, |
e8c2bc1f | 917 | .async_size = sizeof(struct io_async_rw), |
0f203765 | 918 | .work_flags = IO_WQ_WORK_MM | IO_WQ_WORK_BLKCG, |
3a6820f2 | 919 | }, |
0463b6c5 | 920 | [IORING_OP_WRITE] = { |
3a6820f2 JA |
921 | .needs_file = 1, |
922 | .unbound_nonreg_file = 1, | |
8a72758c | 923 | .pollout = 1, |
27926b68 | 924 | .plug = 1, |
e8c2bc1f | 925 | .async_size = sizeof(struct io_async_rw), |
69228338 JA |
926 | .work_flags = IO_WQ_WORK_MM | IO_WQ_WORK_BLKCG | |
927 | IO_WQ_WORK_FSIZE, | |
3a6820f2 | 928 | }, |
0463b6c5 | 929 | [IORING_OP_FADVISE] = { |
4840e418 | 930 | .needs_file = 1, |
0f203765 | 931 | .work_flags = IO_WQ_WORK_BLKCG, |
4840e418 | 932 | }, |
0463b6c5 | 933 | [IORING_OP_MADVISE] = { |
0f203765 | 934 | .work_flags = IO_WQ_WORK_MM | IO_WQ_WORK_BLKCG, |
c1ca757b | 935 | }, |
0463b6c5 | 936 | [IORING_OP_SEND] = { |
fddaface JA |
937 | .needs_file = 1, |
938 | .unbound_nonreg_file = 1, | |
8a72758c | 939 | .pollout = 1, |
0f203765 | 940 | .work_flags = IO_WQ_WORK_MM | IO_WQ_WORK_BLKCG, |
fddaface | 941 | }, |
0463b6c5 | 942 | [IORING_OP_RECV] = { |
fddaface JA |
943 | .needs_file = 1, |
944 | .unbound_nonreg_file = 1, | |
8a72758c | 945 | .pollin = 1, |
bcda7baa | 946 | .buffer_select = 1, |
0f203765 | 947 | .work_flags = IO_WQ_WORK_MM | IO_WQ_WORK_BLKCG, |
fddaface | 948 | }, |
0463b6c5 | 949 | [IORING_OP_OPENAT2] = { |
0f203765 | 950 | .work_flags = IO_WQ_WORK_FILES | IO_WQ_WORK_FS | |
14587a46 | 951 | IO_WQ_WORK_BLKCG | IO_WQ_WORK_MM, |
cebdb986 | 952 | }, |
3e4827b0 JA |
953 | [IORING_OP_EPOLL_CTL] = { |
954 | .unbound_nonreg_file = 1, | |
0f203765 | 955 | .work_flags = IO_WQ_WORK_FILES, |
3e4827b0 | 956 | }, |
7d67af2c PB |
957 | [IORING_OP_SPLICE] = { |
958 | .needs_file = 1, | |
959 | .hash_reg_file = 1, | |
960 | .unbound_nonreg_file = 1, | |
0f203765 | 961 | .work_flags = IO_WQ_WORK_BLKCG, |
ddf0322d JA |
962 | }, |
963 | [IORING_OP_PROVIDE_BUFFERS] = {}, | |
067524e9 | 964 | [IORING_OP_REMOVE_BUFFERS] = {}, |
f2a8d5c7 PB |
965 | [IORING_OP_TEE] = { |
966 | .needs_file = 1, | |
967 | .hash_reg_file = 1, | |
968 | .unbound_nonreg_file = 1, | |
969 | }, | |
36f4fa68 JA |
970 | [IORING_OP_SHUTDOWN] = { |
971 | .needs_file = 1, | |
972 | }, | |
80a261fd JA |
973 | [IORING_OP_RENAMEAT] = { |
974 | .work_flags = IO_WQ_WORK_MM | IO_WQ_WORK_FILES | | |
975 | IO_WQ_WORK_FS | IO_WQ_WORK_BLKCG, | |
976 | }, | |
14a1143b JA |
977 | [IORING_OP_UNLINKAT] = { |
978 | .work_flags = IO_WQ_WORK_MM | IO_WQ_WORK_FILES | | |
979 | IO_WQ_WORK_FS | IO_WQ_WORK_BLKCG, | |
980 | }, | |
d3656344 JA |
981 | }; |
982 | ||
2e0464d4 BM |
983 | enum io_mem_account { |
984 | ACCT_LOCKED, | |
985 | ACCT_PINNED, | |
986 | }; | |
987 | ||
81b68a5c PB |
988 | static void __io_complete_rw(struct io_kiocb *req, long res, long res2, |
989 | struct io_comp_state *cs); | |
78e19bbe | 990 | static void io_cqring_fill_event(struct io_kiocb *req, long res); |
ec9c02ad | 991 | static void io_put_req(struct io_kiocb *req); |
216578e5 | 992 | static void io_put_req_deferred(struct io_kiocb *req, int nr); |
c40f6379 | 993 | static void io_double_put_req(struct io_kiocb *req); |
94ae5e77 | 994 | static struct io_kiocb *io_prep_linked_timeout(struct io_kiocb *req); |
7271ef3a | 995 | static void __io_queue_linked_timeout(struct io_kiocb *req); |
94ae5e77 | 996 | static void io_queue_linked_timeout(struct io_kiocb *req); |
05f3fb3c JA |
997 | static int __io_sqe_files_update(struct io_ring_ctx *ctx, |
998 | struct io_uring_files_update *ip, | |
999 | unsigned nr_args); | |
3ca405eb | 1000 | static void __io_clean_op(struct io_kiocb *req); |
8371adf5 PB |
1001 | static struct file *io_file_get(struct io_submit_state *state, |
1002 | struct io_kiocb *req, int fd, bool fixed); | |
c1379e24 | 1003 | static void __io_queue_sqe(struct io_kiocb *req, struct io_comp_state *cs); |
4349f30e | 1004 | static void io_file_put_work(struct work_struct *work); |
de0617e4 | 1005 | |
b63534c4 JA |
1006 | static ssize_t io_import_iovec(int rw, struct io_kiocb *req, |
1007 | struct iovec **iovec, struct iov_iter *iter, | |
1008 | bool needs_lock); | |
ff6165b2 JA |
1009 | static int io_setup_async_rw(struct io_kiocb *req, const struct iovec *iovec, |
1010 | const struct iovec *fast_iov, | |
227c0c96 | 1011 | struct iov_iter *iter, bool force); |
de0617e4 | 1012 | |
2b188cc1 JA |
1013 | static struct kmem_cache *req_cachep; |
1014 | ||
0918682b | 1015 | static const struct file_operations io_uring_fops; |
2b188cc1 JA |
1016 | |
1017 | struct sock *io_uring_get_socket(struct file *file) | |
1018 | { | |
1019 | #if defined(CONFIG_UNIX) | |
1020 | if (file->f_op == &io_uring_fops) { | |
1021 | struct io_ring_ctx *ctx = file->private_data; | |
1022 | ||
1023 | return ctx->ring_sock->sk; | |
1024 | } | |
1025 | #endif | |
1026 | return NULL; | |
1027 | } | |
1028 | EXPORT_SYMBOL(io_uring_get_socket); | |
1029 | ||
f2f87370 PB |
1030 | #define io_for_each_link(pos, head) \ |
1031 | for (pos = (head); pos; pos = pos->link) | |
1032 | ||
3ca405eb PB |
1033 | static inline void io_clean_op(struct io_kiocb *req) |
1034 | { | |
bb175342 PB |
1035 | if (req->flags & (REQ_F_NEED_CLEANUP | REQ_F_BUFFER_SELECTED | |
1036 | REQ_F_INFLIGHT)) | |
3ca405eb PB |
1037 | __io_clean_op(req); |
1038 | } | |
1039 | ||
08d23634 PB |
1040 | static bool io_match_task(struct io_kiocb *head, |
1041 | struct task_struct *task, | |
1042 | struct files_struct *files) | |
1043 | { | |
1044 | struct io_kiocb *req; | |
1045 | ||
1046 | if (task && head->task != task) | |
1047 | return false; | |
1048 | if (!files) | |
1049 | return true; | |
1050 | ||
1051 | io_for_each_link(req, head) { | |
1052 | if ((req->flags & REQ_F_WORK_INITIALIZED) && | |
1053 | (req->work.flags & IO_WQ_WORK_FILES) && | |
1054 | req->work.identity->files == files) | |
1055 | return true; | |
1056 | } | |
1057 | return false; | |
1058 | } | |
1059 | ||
28cea78a | 1060 | static void io_sq_thread_drop_mm_files(void) |
c40f6379 | 1061 | { |
28cea78a | 1062 | struct files_struct *files = current->files; |
c40f6379 JA |
1063 | struct mm_struct *mm = current->mm; |
1064 | ||
1065 | if (mm) { | |
1066 | kthread_unuse_mm(mm); | |
1067 | mmput(mm); | |
4b70cf9d | 1068 | current->mm = NULL; |
c40f6379 | 1069 | } |
28cea78a JA |
1070 | if (files) { |
1071 | struct nsproxy *nsproxy = current->nsproxy; | |
1072 | ||
1073 | task_lock(current); | |
1074 | current->files = NULL; | |
1075 | current->nsproxy = NULL; | |
1076 | task_unlock(current); | |
1077 | put_files_struct(files); | |
1078 | put_nsproxy(nsproxy); | |
1079 | } | |
1080 | } | |
1081 | ||
1a38ffc9 | 1082 | static int __io_sq_thread_acquire_files(struct io_ring_ctx *ctx) |
28cea78a JA |
1083 | { |
1084 | if (!current->files) { | |
1085 | struct files_struct *files; | |
1086 | struct nsproxy *nsproxy; | |
1087 | ||
1088 | task_lock(ctx->sqo_task); | |
1089 | files = ctx->sqo_task->files; | |
1090 | if (!files) { | |
1091 | task_unlock(ctx->sqo_task); | |
1a38ffc9 | 1092 | return -EOWNERDEAD; |
28cea78a JA |
1093 | } |
1094 | atomic_inc(&files->count); | |
1095 | get_nsproxy(ctx->sqo_task->nsproxy); | |
1096 | nsproxy = ctx->sqo_task->nsproxy; | |
1097 | task_unlock(ctx->sqo_task); | |
1098 | ||
1099 | task_lock(current); | |
1100 | current->files = files; | |
1101 | current->nsproxy = nsproxy; | |
1102 | task_unlock(current); | |
1103 | } | |
1a38ffc9 | 1104 | return 0; |
c40f6379 JA |
1105 | } |
1106 | ||
1107 | static int __io_sq_thread_acquire_mm(struct io_ring_ctx *ctx) | |
1108 | { | |
4b70cf9d JA |
1109 | struct mm_struct *mm; |
1110 | ||
1111 | if (current->mm) | |
1112 | return 0; | |
1113 | ||
1114 | /* Should never happen */ | |
1115 | if (unlikely(!(ctx->flags & IORING_SETUP_SQPOLL))) | |
1116 | return -EFAULT; | |
1117 | ||
1118 | task_lock(ctx->sqo_task); | |
1119 | mm = ctx->sqo_task->mm; | |
1120 | if (unlikely(!mm || !mmget_not_zero(mm))) | |
1121 | mm = NULL; | |
1122 | task_unlock(ctx->sqo_task); | |
1123 | ||
1124 | if (mm) { | |
1125 | kthread_use_mm(mm); | |
1126 | return 0; | |
c40f6379 JA |
1127 | } |
1128 | ||
4b70cf9d | 1129 | return -EFAULT; |
c40f6379 JA |
1130 | } |
1131 | ||
28cea78a JA |
1132 | static int io_sq_thread_acquire_mm_files(struct io_ring_ctx *ctx, |
1133 | struct io_kiocb *req) | |
c40f6379 | 1134 | { |
28cea78a | 1135 | const struct io_op_def *def = &io_op_defs[req->opcode]; |
1a38ffc9 | 1136 | int ret; |
28cea78a JA |
1137 | |
1138 | if (def->work_flags & IO_WQ_WORK_MM) { | |
1a38ffc9 | 1139 | ret = __io_sq_thread_acquire_mm(ctx); |
28cea78a JA |
1140 | if (unlikely(ret)) |
1141 | return ret; | |
1142 | } | |
1143 | ||
1a38ffc9 PB |
1144 | if (def->needs_file || (def->work_flags & IO_WQ_WORK_FILES)) { |
1145 | ret = __io_sq_thread_acquire_files(ctx); | |
1146 | if (unlikely(ret)) | |
1147 | return ret; | |
1148 | } | |
28cea78a JA |
1149 | |
1150 | return 0; | |
c40f6379 JA |
1151 | } |
1152 | ||
91d8f519 DZ |
1153 | static void io_sq_thread_associate_blkcg(struct io_ring_ctx *ctx, |
1154 | struct cgroup_subsys_state **cur_css) | |
1155 | ||
1156 | { | |
1157 | #ifdef CONFIG_BLK_CGROUP | |
1158 | /* puts the old one when swapping */ | |
1159 | if (*cur_css != ctx->sqo_blkcg_css) { | |
1160 | kthread_associate_blkcg(ctx->sqo_blkcg_css); | |
1161 | *cur_css = ctx->sqo_blkcg_css; | |
1162 | } | |
1163 | #endif | |
1164 | } | |
1165 | ||
1166 | static void io_sq_thread_unassociate_blkcg(void) | |
1167 | { | |
1168 | #ifdef CONFIG_BLK_CGROUP | |
1169 | kthread_associate_blkcg(NULL); | |
1170 | #endif | |
1171 | } | |
1172 | ||
c40f6379 JA |
1173 | static inline void req_set_fail_links(struct io_kiocb *req) |
1174 | { | |
1175 | if ((req->flags & (REQ_F_LINK | REQ_F_HARDLINK)) == REQ_F_LINK) | |
1176 | req->flags |= REQ_F_FAIL_LINK; | |
1177 | } | |
4a38aed2 | 1178 | |
1e6fa521 JA |
1179 | /* |
1180 | * None of these are dereferenced, they are simply used to check if any of | |
1181 | * them have changed. If we're under current and check they are still the | |
1182 | * same, we're fine to grab references to them for actual out-of-line use. | |
1183 | */ | |
1184 | static void io_init_identity(struct io_identity *id) | |
1185 | { | |
1186 | id->files = current->files; | |
1187 | id->mm = current->mm; | |
1188 | #ifdef CONFIG_BLK_CGROUP | |
1189 | rcu_read_lock(); | |
1190 | id->blkcg_css = blkcg_css(); | |
1191 | rcu_read_unlock(); | |
1192 | #endif | |
1193 | id->creds = current_cred(); | |
1194 | id->nsproxy = current->nsproxy; | |
1195 | id->fs = current->fs; | |
1196 | id->fsize = rlimit(RLIMIT_FSIZE); | |
4ea33a97 JA |
1197 | #ifdef CONFIG_AUDIT |
1198 | id->loginuid = current->loginuid; | |
1199 | id->sessionid = current->sessionid; | |
1200 | #endif | |
1e6fa521 JA |
1201 | refcount_set(&id->count, 1); |
1202 | } | |
1203 | ||
ec99ca6c PB |
1204 | static inline void __io_req_init_async(struct io_kiocb *req) |
1205 | { | |
1206 | memset(&req->work, 0, sizeof(req->work)); | |
1207 | req->flags |= REQ_F_WORK_INITIALIZED; | |
1208 | } | |
1209 | ||
7cdaf587 XW |
1210 | /* |
1211 | * Note: must call io_req_init_async() for the first time you | |
1212 | * touch any members of io_wq_work. | |
1213 | */ | |
1214 | static inline void io_req_init_async(struct io_kiocb *req) | |
1215 | { | |
500a373d JA |
1216 | struct io_uring_task *tctx = current->io_uring; |
1217 | ||
7cdaf587 XW |
1218 | if (req->flags & REQ_F_WORK_INITIALIZED) |
1219 | return; | |
1220 | ||
ec99ca6c | 1221 | __io_req_init_async(req); |
500a373d JA |
1222 | |
1223 | /* Grab a ref if this isn't our static identity */ | |
1224 | req->work.identity = tctx->identity; | |
1225 | if (tctx->identity != &tctx->__identity) | |
1226 | refcount_inc(&req->work.identity->count); | |
7cdaf587 XW |
1227 | } |
1228 | ||
0cdaf760 PB |
1229 | static inline bool io_async_submit(struct io_ring_ctx *ctx) |
1230 | { | |
1231 | return ctx->flags & IORING_SETUP_SQPOLL; | |
1232 | } | |
1233 | ||
2b188cc1 JA |
1234 | static void io_ring_ctx_ref_free(struct percpu_ref *ref) |
1235 | { | |
1236 | struct io_ring_ctx *ctx = container_of(ref, struct io_ring_ctx, refs); | |
1237 | ||
0f158b4c | 1238 | complete(&ctx->ref_comp); |
2b188cc1 JA |
1239 | } |
1240 | ||
8eb7e2d0 PB |
1241 | static inline bool io_is_timeout_noseq(struct io_kiocb *req) |
1242 | { | |
1243 | return !req->timeout.off; | |
1244 | } | |
1245 | ||
2b188cc1 JA |
1246 | static struct io_ring_ctx *io_ring_ctx_alloc(struct io_uring_params *p) |
1247 | { | |
1248 | struct io_ring_ctx *ctx; | |
78076bb6 | 1249 | int hash_bits; |
2b188cc1 JA |
1250 | |
1251 | ctx = kzalloc(sizeof(*ctx), GFP_KERNEL); | |
1252 | if (!ctx) | |
1253 | return NULL; | |
1254 | ||
0ddf92e8 JA |
1255 | ctx->fallback_req = kmem_cache_alloc(req_cachep, GFP_KERNEL); |
1256 | if (!ctx->fallback_req) | |
1257 | goto err; | |
1258 | ||
78076bb6 JA |
1259 | /* |
1260 | * Use 5 bits less than the max cq entries, that should give us around | |
1261 | * 32 entries per hash list if totally full and uniformly spread. | |
1262 | */ | |
1263 | hash_bits = ilog2(p->cq_entries); | |
1264 | hash_bits -= 5; | |
1265 | if (hash_bits <= 0) | |
1266 | hash_bits = 1; | |
1267 | ctx->cancel_hash_bits = hash_bits; | |
1268 | ctx->cancel_hash = kmalloc((1U << hash_bits) * sizeof(struct hlist_head), | |
1269 | GFP_KERNEL); | |
1270 | if (!ctx->cancel_hash) | |
1271 | goto err; | |
1272 | __hash_init(ctx->cancel_hash, 1U << hash_bits); | |
1273 | ||
21482896 | 1274 | if (percpu_ref_init(&ctx->refs, io_ring_ctx_ref_free, |
206aefde JA |
1275 | PERCPU_REF_ALLOW_REINIT, GFP_KERNEL)) |
1276 | goto err; | |
2b188cc1 JA |
1277 | |
1278 | ctx->flags = p->flags; | |
90554200 | 1279 | init_waitqueue_head(&ctx->sqo_sq_wait); |
69fb2131 | 1280 | INIT_LIST_HEAD(&ctx->sqd_list); |
2b188cc1 | 1281 | init_waitqueue_head(&ctx->cq_wait); |
1d7bb1d5 | 1282 | INIT_LIST_HEAD(&ctx->cq_overflow_list); |
0f158b4c JA |
1283 | init_completion(&ctx->ref_comp); |
1284 | init_completion(&ctx->sq_thread_comp); | |
5a2e745d | 1285 | idr_init(&ctx->io_buffer_idr); |
071698e1 | 1286 | idr_init(&ctx->personality_idr); |
2b188cc1 JA |
1287 | mutex_init(&ctx->uring_lock); |
1288 | init_waitqueue_head(&ctx->wait); | |
1289 | spin_lock_init(&ctx->completion_lock); | |
540e32a0 | 1290 | INIT_LIST_HEAD(&ctx->iopoll_list); |
de0617e4 | 1291 | INIT_LIST_HEAD(&ctx->defer_list); |
5262f567 | 1292 | INIT_LIST_HEAD(&ctx->timeout_list); |
fcb323cc JA |
1293 | spin_lock_init(&ctx->inflight_lock); |
1294 | INIT_LIST_HEAD(&ctx->inflight_list); | |
4a38aed2 JA |
1295 | INIT_DELAYED_WORK(&ctx->file_put_work, io_file_put_work); |
1296 | init_llist_head(&ctx->file_put_llist); | |
2b188cc1 | 1297 | return ctx; |
206aefde | 1298 | err: |
0ddf92e8 JA |
1299 | if (ctx->fallback_req) |
1300 | kmem_cache_free(req_cachep, ctx->fallback_req); | |
78076bb6 | 1301 | kfree(ctx->cancel_hash); |
206aefde JA |
1302 | kfree(ctx); |
1303 | return NULL; | |
2b188cc1 JA |
1304 | } |
1305 | ||
9cf7c104 | 1306 | static bool req_need_defer(struct io_kiocb *req, u32 seq) |
7adf4eaf | 1307 | { |
2bc9930e JA |
1308 | if (unlikely(req->flags & REQ_F_IO_DRAIN)) { |
1309 | struct io_ring_ctx *ctx = req->ctx; | |
a197f664 | 1310 | |
9cf7c104 | 1311 | return seq != ctx->cached_cq_tail |
2c3bac6d | 1312 | + READ_ONCE(ctx->cached_cq_overflow); |
2bc9930e | 1313 | } |
de0617e4 | 1314 | |
9d858b21 | 1315 | return false; |
de0617e4 JA |
1316 | } |
1317 | ||
de0617e4 | 1318 | static void __io_commit_cqring(struct io_ring_ctx *ctx) |
2b188cc1 | 1319 | { |
75b28aff | 1320 | struct io_rings *rings = ctx->rings; |
2b188cc1 | 1321 | |
07910158 PB |
1322 | /* order cqe stores with ring update */ |
1323 | smp_store_release(&rings->cq.tail, ctx->cached_cq_tail); | |
2b188cc1 | 1324 | |
07910158 PB |
1325 | if (wq_has_sleeper(&ctx->cq_wait)) { |
1326 | wake_up_interruptible(&ctx->cq_wait); | |
1327 | kill_fasync(&ctx->cq_fasync, SIGIO, POLL_IN); | |
2b188cc1 JA |
1328 | } |
1329 | } | |
1330 | ||
5c3462cf | 1331 | static void io_put_identity(struct io_uring_task *tctx, struct io_kiocb *req) |
1e6fa521 | 1332 | { |
500a373d | 1333 | if (req->work.identity == &tctx->__identity) |
1e6fa521 JA |
1334 | return; |
1335 | if (refcount_dec_and_test(&req->work.identity->count)) | |
1336 | kfree(req->work.identity); | |
1337 | } | |
1338 | ||
4edf20f9 | 1339 | static void io_req_clean_work(struct io_kiocb *req) |
18d9be1a | 1340 | { |
7cdaf587 | 1341 | if (!(req->flags & REQ_F_WORK_INITIALIZED)) |
4edf20f9 | 1342 | return; |
51a4cc11 JA |
1343 | |
1344 | req->flags &= ~REQ_F_WORK_INITIALIZED; | |
7cdaf587 | 1345 | |
dfead8a8 | 1346 | if (req->work.flags & IO_WQ_WORK_MM) { |
98447d65 | 1347 | mmdrop(req->work.identity->mm); |
dfead8a8 | 1348 | req->work.flags &= ~IO_WQ_WORK_MM; |
cccf0ee8 | 1349 | } |
91d8f519 | 1350 | #ifdef CONFIG_BLK_CGROUP |
dfead8a8 | 1351 | if (req->work.flags & IO_WQ_WORK_BLKCG) { |
98447d65 | 1352 | css_put(req->work.identity->blkcg_css); |
dfead8a8 JA |
1353 | req->work.flags &= ~IO_WQ_WORK_BLKCG; |
1354 | } | |
91d8f519 | 1355 | #endif |
dfead8a8 | 1356 | if (req->work.flags & IO_WQ_WORK_CREDS) { |
98447d65 | 1357 | put_cred(req->work.identity->creds); |
dfead8a8 | 1358 | req->work.flags &= ~IO_WQ_WORK_CREDS; |
cccf0ee8 | 1359 | } |
dfead8a8 | 1360 | if (req->work.flags & IO_WQ_WORK_FS) { |
98447d65 | 1361 | struct fs_struct *fs = req->work.identity->fs; |
51a4cc11 | 1362 | |
98447d65 | 1363 | spin_lock(&req->work.identity->fs->lock); |
ff002b30 JA |
1364 | if (--fs->users) |
1365 | fs = NULL; | |
98447d65 | 1366 | spin_unlock(&req->work.identity->fs->lock); |
ff002b30 JA |
1367 | if (fs) |
1368 | free_fs_struct(fs); | |
dfead8a8 | 1369 | req->work.flags &= ~IO_WQ_WORK_FS; |
ff002b30 | 1370 | } |
51a4cc11 | 1371 | |
5c3462cf | 1372 | io_put_identity(req->task->io_uring, req); |
561fb04a JA |
1373 | } |
1374 | ||
1e6fa521 JA |
1375 | /* |
1376 | * Create a private copy of io_identity, since some fields don't match | |
1377 | * the current context. | |
1378 | */ | |
1379 | static bool io_identity_cow(struct io_kiocb *req) | |
1380 | { | |
5c3462cf | 1381 | struct io_uring_task *tctx = current->io_uring; |
1e6fa521 JA |
1382 | const struct cred *creds = NULL; |
1383 | struct io_identity *id; | |
1384 | ||
1385 | if (req->work.flags & IO_WQ_WORK_CREDS) | |
1386 | creds = req->work.identity->creds; | |
1387 | ||
1388 | id = kmemdup(req->work.identity, sizeof(*id), GFP_KERNEL); | |
1389 | if (unlikely(!id)) { | |
1390 | req->work.flags |= IO_WQ_WORK_CANCEL; | |
1391 | return false; | |
1392 | } | |
1393 | ||
1394 | /* | |
1395 | * We can safely just re-init the creds we copied Either the field | |
1396 | * matches the current one, or we haven't grabbed it yet. The only | |
1397 | * exception is ->creds, through registered personalities, so handle | |
1398 | * that one separately. | |
1399 | */ | |
1400 | io_init_identity(id); | |
1401 | if (creds) | |
1402 | req->work.identity->creds = creds; | |
1403 | ||
1404 | /* add one for this request */ | |
1405 | refcount_inc(&id->count); | |
1406 | ||
cb8a8ae3 JA |
1407 | /* drop tctx and req identity references, if needed */ |
1408 | if (tctx->identity != &tctx->__identity && | |
1409 | refcount_dec_and_test(&tctx->identity->count)) | |
1410 | kfree(tctx->identity); | |
1411 | if (req->work.identity != &tctx->__identity && | |
1412 | refcount_dec_and_test(&req->work.identity->count)) | |
1e6fa521 JA |
1413 | kfree(req->work.identity); |
1414 | ||
1415 | req->work.identity = id; | |
500a373d | 1416 | tctx->identity = id; |
1e6fa521 JA |
1417 | return true; |
1418 | } | |
1419 | ||
1420 | static bool io_grab_identity(struct io_kiocb *req) | |
18d9be1a | 1421 | { |
d3656344 | 1422 | const struct io_op_def *def = &io_op_defs[req->opcode]; |
5c3462cf | 1423 | struct io_identity *id = req->work.identity; |
23329513 | 1424 | struct io_ring_ctx *ctx = req->ctx; |
54a91f3b | 1425 | |
69228338 JA |
1426 | if (def->work_flags & IO_WQ_WORK_FSIZE) { |
1427 | if (id->fsize != rlimit(RLIMIT_FSIZE)) | |
1428 | return false; | |
1429 | req->work.flags |= IO_WQ_WORK_FSIZE; | |
1430 | } | |
16d59803 | 1431 | |
dfead8a8 | 1432 | if (!(req->work.flags & IO_WQ_WORK_FILES) && |
1e6fa521 | 1433 | (def->work_flags & IO_WQ_WORK_FILES) && |
23329513 | 1434 | !(req->flags & REQ_F_NO_FILE_TABLE)) { |
1e6fa521 JA |
1435 | if (id->files != current->files || |
1436 | id->nsproxy != current->nsproxy) | |
1437 | return false; | |
1438 | atomic_inc(&id->files->count); | |
1439 | get_nsproxy(id->nsproxy); | |
23329513 PB |
1440 | req->flags |= REQ_F_INFLIGHT; |
1441 | ||
1442 | spin_lock_irq(&ctx->inflight_lock); | |
1443 | list_add(&req->inflight_entry, &ctx->inflight_list); | |
1444 | spin_unlock_irq(&ctx->inflight_lock); | |
dfead8a8 | 1445 | req->work.flags |= IO_WQ_WORK_FILES; |
dca9cf8b | 1446 | } |
91d8f519 | 1447 | #ifdef CONFIG_BLK_CGROUP |
dfead8a8 JA |
1448 | if (!(req->work.flags & IO_WQ_WORK_BLKCG) && |
1449 | (def->work_flags & IO_WQ_WORK_BLKCG)) { | |
91d8f519 | 1450 | rcu_read_lock(); |
1e6fa521 JA |
1451 | if (id->blkcg_css != blkcg_css()) { |
1452 | rcu_read_unlock(); | |
1453 | return false; | |
1454 | } | |
91d8f519 DZ |
1455 | /* |
1456 | * This should be rare, either the cgroup is dying or the task | |
1457 | * is moving cgroups. Just punt to root for the handful of ios. | |
1458 | */ | |
1e6fa521 | 1459 | if (css_tryget_online(id->blkcg_css)) |
dfead8a8 | 1460 | req->work.flags |= IO_WQ_WORK_BLKCG; |
91d8f519 DZ |
1461 | rcu_read_unlock(); |
1462 | } | |
1463 | #endif | |
dfead8a8 | 1464 | if (!(req->work.flags & IO_WQ_WORK_CREDS)) { |
1e6fa521 JA |
1465 | if (id->creds != current_cred()) |
1466 | return false; | |
1467 | get_cred(id->creds); | |
dfead8a8 JA |
1468 | req->work.flags |= IO_WQ_WORK_CREDS; |
1469 | } | |
4ea33a97 JA |
1470 | #ifdef CONFIG_AUDIT |
1471 | if (!uid_eq(current->loginuid, id->loginuid) || | |
1472 | current->sessionid != id->sessionid) | |
1473 | return false; | |
1474 | #endif | |
dfead8a8 JA |
1475 | if (!(req->work.flags & IO_WQ_WORK_FS) && |
1476 | (def->work_flags & IO_WQ_WORK_FS)) { | |
1e6fa521 JA |
1477 | if (current->fs != id->fs) |
1478 | return false; | |
1479 | spin_lock(&id->fs->lock); | |
1480 | if (!id->fs->in_exec) { | |
1481 | id->fs->users++; | |
dfead8a8 | 1482 | req->work.flags |= IO_WQ_WORK_FS; |
dca9cf8b PB |
1483 | } else { |
1484 | req->work.flags |= IO_WQ_WORK_CANCEL; | |
1485 | } | |
1486 | spin_unlock(¤t->fs->lock); | |
1487 | } | |
1e6fa521 JA |
1488 | |
1489 | return true; | |
1490 | } | |
1491 | ||
1492 | static void io_prep_async_work(struct io_kiocb *req) | |
1493 | { | |
1494 | const struct io_op_def *def = &io_op_defs[req->opcode]; | |
1e6fa521 | 1495 | struct io_ring_ctx *ctx = req->ctx; |
5c3462cf | 1496 | struct io_identity *id; |
1e6fa521 JA |
1497 | |
1498 | io_req_init_async(req); | |
5c3462cf | 1499 | id = req->work.identity; |
1e6fa521 | 1500 | |
feaadc4f PB |
1501 | if (req->flags & REQ_F_FORCE_ASYNC) |
1502 | req->work.flags |= IO_WQ_WORK_CONCURRENT; | |
1503 | ||
1e6fa521 JA |
1504 | if (req->flags & REQ_F_ISREG) { |
1505 | if (def->hash_reg_file || (ctx->flags & IORING_SETUP_IOPOLL)) | |
1506 | io_wq_hash_work(&req->work, file_inode(req->file)); | |
1507 | } else { | |
1508 | if (def->unbound_nonreg_file) | |
1509 | req->work.flags |= IO_WQ_WORK_UNBOUND; | |
1510 | } | |
1511 | ||
1512 | /* ->mm can never change on us */ | |
1513 | if (!(req->work.flags & IO_WQ_WORK_MM) && | |
1514 | (def->work_flags & IO_WQ_WORK_MM)) { | |
1515 | mmgrab(id->mm); | |
1516 | req->work.flags |= IO_WQ_WORK_MM; | |
1517 | } | |
1518 | ||
1519 | /* if we fail grabbing identity, we must COW, regrab, and retry */ | |
1520 | if (io_grab_identity(req)) | |
1521 | return; | |
1522 | ||
1523 | if (!io_identity_cow(req)) | |
1524 | return; | |
1525 | ||
1526 | /* can't fail at this point */ | |
1527 | if (!io_grab_identity(req)) | |
1528 | WARN_ON(1); | |
561fb04a | 1529 | } |
cccf0ee8 | 1530 | |
cbdcb435 | 1531 | static void io_prep_async_link(struct io_kiocb *req) |
561fb04a | 1532 | { |
cbdcb435 | 1533 | struct io_kiocb *cur; |
54a91f3b | 1534 | |
f2f87370 PB |
1535 | io_for_each_link(cur, req) |
1536 | io_prep_async_work(cur); | |
561fb04a JA |
1537 | } |
1538 | ||
7271ef3a | 1539 | static struct io_kiocb *__io_queue_async_work(struct io_kiocb *req) |
561fb04a | 1540 | { |
a197f664 | 1541 | struct io_ring_ctx *ctx = req->ctx; |
cbdcb435 | 1542 | struct io_kiocb *link = io_prep_linked_timeout(req); |
561fb04a | 1543 | |
8766dd51 PB |
1544 | trace_io_uring_queue_async_work(ctx, io_wq_is_hashed(&req->work), req, |
1545 | &req->work, req->flags); | |
1546 | io_wq_enqueue(ctx->io_wq, &req->work); | |
7271ef3a | 1547 | return link; |
18d9be1a JA |
1548 | } |
1549 | ||
cbdcb435 PB |
1550 | static void io_queue_async_work(struct io_kiocb *req) |
1551 | { | |
7271ef3a JA |
1552 | struct io_kiocb *link; |
1553 | ||
cbdcb435 PB |
1554 | /* init ->work of the whole link before punting */ |
1555 | io_prep_async_link(req); | |
7271ef3a JA |
1556 | link = __io_queue_async_work(req); |
1557 | ||
1558 | if (link) | |
1559 | io_queue_linked_timeout(link); | |
cbdcb435 PB |
1560 | } |
1561 | ||
5262f567 JA |
1562 | static void io_kill_timeout(struct io_kiocb *req) |
1563 | { | |
e8c2bc1f | 1564 | struct io_timeout_data *io = req->async_data; |
5262f567 JA |
1565 | int ret; |
1566 | ||
e8c2bc1f | 1567 | ret = hrtimer_try_to_cancel(&io->timer); |
5262f567 | 1568 | if (ret != -1) { |
01cec8c1 PB |
1569 | atomic_set(&req->ctx->cq_timeouts, |
1570 | atomic_read(&req->ctx->cq_timeouts) + 1); | |
135fcde8 | 1571 | list_del_init(&req->timeout.list); |
78e19bbe | 1572 | io_cqring_fill_event(req, 0); |
216578e5 | 1573 | io_put_req_deferred(req, 1); |
5262f567 JA |
1574 | } |
1575 | } | |
1576 | ||
76e1b642 JA |
1577 | /* |
1578 | * Returns true if we found and killed one or more timeouts | |
1579 | */ | |
6b81928d PB |
1580 | static bool io_kill_timeouts(struct io_ring_ctx *ctx, struct task_struct *tsk, |
1581 | struct files_struct *files) | |
5262f567 JA |
1582 | { |
1583 | struct io_kiocb *req, *tmp; | |
76e1b642 | 1584 | int canceled = 0; |
5262f567 JA |
1585 | |
1586 | spin_lock_irq(&ctx->completion_lock); | |
f3606e3a | 1587 | list_for_each_entry_safe(req, tmp, &ctx->timeout_list, timeout.list) { |
6b81928d | 1588 | if (io_match_task(req, tsk, files)) { |
f3606e3a | 1589 | io_kill_timeout(req); |
76e1b642 JA |
1590 | canceled++; |
1591 | } | |
f3606e3a | 1592 | } |
5262f567 | 1593 | spin_unlock_irq(&ctx->completion_lock); |
76e1b642 | 1594 | return canceled != 0; |
5262f567 JA |
1595 | } |
1596 | ||
04518945 | 1597 | static void __io_queue_deferred(struct io_ring_ctx *ctx) |
de0617e4 | 1598 | { |
04518945 | 1599 | do { |
27dc8338 PB |
1600 | struct io_defer_entry *de = list_first_entry(&ctx->defer_list, |
1601 | struct io_defer_entry, list); | |
7271ef3a | 1602 | struct io_kiocb *link; |
de0617e4 | 1603 | |
9cf7c104 | 1604 | if (req_need_defer(de->req, de->seq)) |
04518945 | 1605 | break; |
27dc8338 | 1606 | list_del_init(&de->list); |
cbdcb435 | 1607 | /* punt-init is done before queueing for defer */ |
7271ef3a JA |
1608 | link = __io_queue_async_work(de->req); |
1609 | if (link) { | |
1610 | __io_queue_linked_timeout(link); | |
1611 | /* drop submission reference */ | |
216578e5 | 1612 | io_put_req_deferred(link, 1); |
7271ef3a | 1613 | } |
27dc8338 | 1614 | kfree(de); |
04518945 PB |
1615 | } while (!list_empty(&ctx->defer_list)); |
1616 | } | |
1617 | ||
360428f8 | 1618 | static void io_flush_timeouts(struct io_ring_ctx *ctx) |
de0617e4 | 1619 | { |
360428f8 PB |
1620 | while (!list_empty(&ctx->timeout_list)) { |
1621 | struct io_kiocb *req = list_first_entry(&ctx->timeout_list, | |
135fcde8 | 1622 | struct io_kiocb, timeout.list); |
de0617e4 | 1623 | |
8eb7e2d0 | 1624 | if (io_is_timeout_noseq(req)) |
360428f8 | 1625 | break; |
bfe68a22 PB |
1626 | if (req->timeout.target_seq != ctx->cached_cq_tail |
1627 | - atomic_read(&ctx->cq_timeouts)) | |
360428f8 | 1628 | break; |
bfe68a22 | 1629 | |
135fcde8 | 1630 | list_del_init(&req->timeout.list); |
5262f567 | 1631 | io_kill_timeout(req); |
360428f8 PB |
1632 | } |
1633 | } | |
5262f567 | 1634 | |
360428f8 PB |
1635 | static void io_commit_cqring(struct io_ring_ctx *ctx) |
1636 | { | |
1637 | io_flush_timeouts(ctx); | |
de0617e4 JA |
1638 | __io_commit_cqring(ctx); |
1639 | ||
04518945 PB |
1640 | if (unlikely(!list_empty(&ctx->defer_list))) |
1641 | __io_queue_deferred(ctx); | |
de0617e4 JA |
1642 | } |
1643 | ||
90554200 JA |
1644 | static inline bool io_sqring_full(struct io_ring_ctx *ctx) |
1645 | { | |
1646 | struct io_rings *r = ctx->rings; | |
1647 | ||
1648 | return READ_ONCE(r->sq.tail) - ctx->cached_sq_head == r->sq_ring_entries; | |
1649 | } | |
1650 | ||
2b188cc1 JA |
1651 | static struct io_uring_cqe *io_get_cqring(struct io_ring_ctx *ctx) |
1652 | { | |
75b28aff | 1653 | struct io_rings *rings = ctx->rings; |
2b188cc1 JA |
1654 | unsigned tail; |
1655 | ||
1656 | tail = ctx->cached_cq_tail; | |
115e12e5 SB |
1657 | /* |
1658 | * writes to the cq entry need to come after reading head; the | |
1659 | * control dependency is enough as we're using WRITE_ONCE to | |
1660 | * fill the cq entry | |
1661 | */ | |
75b28aff | 1662 | if (tail - READ_ONCE(rings->cq.head) == rings->cq_ring_entries) |
2b188cc1 JA |
1663 | return NULL; |
1664 | ||
1665 | ctx->cached_cq_tail++; | |
75b28aff | 1666 | return &rings->cqes[tail & ctx->cq_mask]; |
2b188cc1 JA |
1667 | } |
1668 | ||
f2842ab5 JA |
1669 | static inline bool io_should_trigger_evfd(struct io_ring_ctx *ctx) |
1670 | { | |
f0b493e6 JA |
1671 | if (!ctx->cq_ev_fd) |
1672 | return false; | |
7e55a19c SG |
1673 | if (READ_ONCE(ctx->rings->cq_flags) & IORING_CQ_EVENTFD_DISABLED) |
1674 | return false; | |
f2842ab5 JA |
1675 | if (!ctx->eventfd_async) |
1676 | return true; | |
b41e9852 | 1677 | return io_wq_current_is_worker(); |
f2842ab5 JA |
1678 | } |
1679 | ||
b41e9852 | 1680 | static void io_cqring_ev_posted(struct io_ring_ctx *ctx) |
1d7bb1d5 JA |
1681 | { |
1682 | if (waitqueue_active(&ctx->wait)) | |
1683 | wake_up(&ctx->wait); | |
534ca6d6 JA |
1684 | if (ctx->sq_data && waitqueue_active(&ctx->sq_data->wait)) |
1685 | wake_up(&ctx->sq_data->wait); | |
b41e9852 | 1686 | if (io_should_trigger_evfd(ctx)) |
1d7bb1d5 JA |
1687 | eventfd_signal(ctx->cq_ev_fd, 1); |
1688 | } | |
1689 | ||
46930143 PB |
1690 | static void io_cqring_mark_overflow(struct io_ring_ctx *ctx) |
1691 | { | |
1692 | if (list_empty(&ctx->cq_overflow_list)) { | |
1693 | clear_bit(0, &ctx->sq_check_overflow); | |
1694 | clear_bit(0, &ctx->cq_check_overflow); | |
1695 | ctx->rings->sq_flags &= ~IORING_SQ_CQ_OVERFLOW; | |
1696 | } | |
1697 | } | |
1698 | ||
c4a2ed72 | 1699 | /* Returns true if there are no backlogged entries after the flush */ |
e6c8aa9a JA |
1700 | static bool io_cqring_overflow_flush(struct io_ring_ctx *ctx, bool force, |
1701 | struct task_struct *tsk, | |
1702 | struct files_struct *files) | |
1d7bb1d5 JA |
1703 | { |
1704 | struct io_rings *rings = ctx->rings; | |
e6c8aa9a | 1705 | struct io_kiocb *req, *tmp; |
1d7bb1d5 | 1706 | struct io_uring_cqe *cqe; |
1d7bb1d5 JA |
1707 | unsigned long flags; |
1708 | LIST_HEAD(list); | |
1709 | ||
1710 | if (!force) { | |
1711 | if (list_empty_careful(&ctx->cq_overflow_list)) | |
c4a2ed72 | 1712 | return true; |
1d7bb1d5 JA |
1713 | if ((ctx->cached_cq_tail - READ_ONCE(rings->cq.head) == |
1714 | rings->cq_ring_entries)) | |
c4a2ed72 | 1715 | return false; |
1d7bb1d5 JA |
1716 | } |
1717 | ||
1718 | spin_lock_irqsave(&ctx->completion_lock, flags); | |
1719 | ||
1720 | /* if force is set, the ring is going away. always drop after that */ | |
1721 | if (force) | |
69b3e546 | 1722 | ctx->cq_overflow_flushed = 1; |
1d7bb1d5 | 1723 | |
c4a2ed72 | 1724 | cqe = NULL; |
e6c8aa9a | 1725 | list_for_each_entry_safe(req, tmp, &ctx->cq_overflow_list, compl.list) { |
08d23634 | 1726 | if (!io_match_task(req, tsk, files)) |
e6c8aa9a JA |
1727 | continue; |
1728 | ||
1d7bb1d5 JA |
1729 | cqe = io_get_cqring(ctx); |
1730 | if (!cqe && !force) | |
1731 | break; | |
1732 | ||
40d8ddd4 | 1733 | list_move(&req->compl.list, &list); |
1d7bb1d5 JA |
1734 | if (cqe) { |
1735 | WRITE_ONCE(cqe->user_data, req->user_data); | |
1736 | WRITE_ONCE(cqe->res, req->result); | |
0f7e466b | 1737 | WRITE_ONCE(cqe->flags, req->compl.cflags); |
1d7bb1d5 | 1738 | } else { |
2c3bac6d | 1739 | ctx->cached_cq_overflow++; |
1d7bb1d5 | 1740 | WRITE_ONCE(ctx->rings->cq_overflow, |
2c3bac6d | 1741 | ctx->cached_cq_overflow); |
1d7bb1d5 JA |
1742 | } |
1743 | } | |
1744 | ||
1745 | io_commit_cqring(ctx); | |
46930143 PB |
1746 | io_cqring_mark_overflow(ctx); |
1747 | ||
1d7bb1d5 JA |
1748 | spin_unlock_irqrestore(&ctx->completion_lock, flags); |
1749 | io_cqring_ev_posted(ctx); | |
1750 | ||
1751 | while (!list_empty(&list)) { | |
40d8ddd4 PB |
1752 | req = list_first_entry(&list, struct io_kiocb, compl.list); |
1753 | list_del(&req->compl.list); | |
ec9c02ad | 1754 | io_put_req(req); |
1d7bb1d5 | 1755 | } |
c4a2ed72 JA |
1756 | |
1757 | return cqe != NULL; | |
1d7bb1d5 JA |
1758 | } |
1759 | ||
bcda7baa | 1760 | static void __io_cqring_fill_event(struct io_kiocb *req, long res, long cflags) |
2b188cc1 | 1761 | { |
78e19bbe | 1762 | struct io_ring_ctx *ctx = req->ctx; |
2b188cc1 JA |
1763 | struct io_uring_cqe *cqe; |
1764 | ||
78e19bbe | 1765 | trace_io_uring_complete(ctx, req->user_data, res); |
51c3ff62 | 1766 | |
2b188cc1 JA |
1767 | /* |
1768 | * If we can't get a cq entry, userspace overflowed the | |
1769 | * submission (by quite a lot). Increment the overflow count in | |
1770 | * the ring. | |
1771 | */ | |
1772 | cqe = io_get_cqring(ctx); | |
1d7bb1d5 | 1773 | if (likely(cqe)) { |
78e19bbe | 1774 | WRITE_ONCE(cqe->user_data, req->user_data); |
2b188cc1 | 1775 | WRITE_ONCE(cqe->res, res); |
bcda7baa | 1776 | WRITE_ONCE(cqe->flags, cflags); |
fdaf083c JA |
1777 | } else if (ctx->cq_overflow_flushed || |
1778 | atomic_read(&req->task->io_uring->in_idle)) { | |
0f212204 JA |
1779 | /* |
1780 | * If we're in ring overflow flush mode, or in task cancel mode, | |
1781 | * then we cannot store the request for later flushing, we need | |
1782 | * to drop it on the floor. | |
1783 | */ | |
2c3bac6d PB |
1784 | ctx->cached_cq_overflow++; |
1785 | WRITE_ONCE(ctx->rings->cq_overflow, ctx->cached_cq_overflow); | |
1d7bb1d5 | 1786 | } else { |
ad3eb2c8 JA |
1787 | if (list_empty(&ctx->cq_overflow_list)) { |
1788 | set_bit(0, &ctx->sq_check_overflow); | |
1789 | set_bit(0, &ctx->cq_check_overflow); | |
6d5f9049 | 1790 | ctx->rings->sq_flags |= IORING_SQ_CQ_OVERFLOW; |
ad3eb2c8 | 1791 | } |
40d8ddd4 | 1792 | io_clean_op(req); |
1d7bb1d5 | 1793 | req->result = res; |
0f7e466b | 1794 | req->compl.cflags = cflags; |
40d8ddd4 PB |
1795 | refcount_inc(&req->refs); |
1796 | list_add_tail(&req->compl.list, &ctx->cq_overflow_list); | |
2b188cc1 JA |
1797 | } |
1798 | } | |
1799 | ||
bcda7baa JA |
1800 | static void io_cqring_fill_event(struct io_kiocb *req, long res) |
1801 | { | |
1802 | __io_cqring_fill_event(req, res, 0); | |
1803 | } | |
1804 | ||
e1e16097 | 1805 | static void io_cqring_add_event(struct io_kiocb *req, long res, long cflags) |
2b188cc1 | 1806 | { |
78e19bbe | 1807 | struct io_ring_ctx *ctx = req->ctx; |
2b188cc1 JA |
1808 | unsigned long flags; |
1809 | ||
1810 | spin_lock_irqsave(&ctx->completion_lock, flags); | |
bcda7baa | 1811 | __io_cqring_fill_event(req, res, cflags); |
2b188cc1 JA |
1812 | io_commit_cqring(ctx); |
1813 | spin_unlock_irqrestore(&ctx->completion_lock, flags); | |
1814 | ||
8c838788 | 1815 | io_cqring_ev_posted(ctx); |
2b188cc1 JA |
1816 | } |
1817 | ||
229a7b63 | 1818 | static void io_submit_flush_completions(struct io_comp_state *cs) |
bcda7baa | 1819 | { |
229a7b63 JA |
1820 | struct io_ring_ctx *ctx = cs->ctx; |
1821 | ||
1822 | spin_lock_irq(&ctx->completion_lock); | |
1823 | while (!list_empty(&cs->list)) { | |
1824 | struct io_kiocb *req; | |
1825 | ||
3ca405eb PB |
1826 | req = list_first_entry(&cs->list, struct io_kiocb, compl.list); |
1827 | list_del(&req->compl.list); | |
0f7e466b | 1828 | __io_cqring_fill_event(req, req->result, req->compl.cflags); |
216578e5 PB |
1829 | |
1830 | /* | |
1831 | * io_free_req() doesn't care about completion_lock unless one | |
1832 | * of these flags is set. REQ_F_WORK_INITIALIZED is in the list | |
1833 | * because of a potential deadlock with req->work.fs->lock | |
1834 | */ | |
1835 | if (req->flags & (REQ_F_FAIL_LINK|REQ_F_LINK_TIMEOUT | |
1836 | |REQ_F_WORK_INITIALIZED)) { | |
229a7b63 JA |
1837 | spin_unlock_irq(&ctx->completion_lock); |
1838 | io_put_req(req); | |
1839 | spin_lock_irq(&ctx->completion_lock); | |
216578e5 PB |
1840 | } else { |
1841 | io_put_req(req); | |
229a7b63 JA |
1842 | } |
1843 | } | |
1844 | io_commit_cqring(ctx); | |
1845 | spin_unlock_irq(&ctx->completion_lock); | |
1846 | ||
1847 | io_cqring_ev_posted(ctx); | |
1848 | cs->nr = 0; | |
1849 | } | |
1850 | ||
1851 | static void __io_req_complete(struct io_kiocb *req, long res, unsigned cflags, | |
1852 | struct io_comp_state *cs) | |
1853 | { | |
1854 | if (!cs) { | |
1855 | io_cqring_add_event(req, res, cflags); | |
1856 | io_put_req(req); | |
1857 | } else { | |
3ca405eb | 1858 | io_clean_op(req); |
229a7b63 | 1859 | req->result = res; |
0f7e466b | 1860 | req->compl.cflags = cflags; |
3ca405eb | 1861 | list_add_tail(&req->compl.list, &cs->list); |
229a7b63 JA |
1862 | if (++cs->nr >= 32) |
1863 | io_submit_flush_completions(cs); | |
1864 | } | |
e1e16097 JA |
1865 | } |
1866 | ||
1867 | static void io_req_complete(struct io_kiocb *req, long res) | |
bcda7baa | 1868 | { |
229a7b63 | 1869 | __io_req_complete(req, res, 0, NULL); |
bcda7baa JA |
1870 | } |
1871 | ||
0ddf92e8 JA |
1872 | static inline bool io_is_fallback_req(struct io_kiocb *req) |
1873 | { | |
1874 | return req == (struct io_kiocb *) | |
1875 | ((unsigned long) req->ctx->fallback_req & ~1UL); | |
1876 | } | |
1877 | ||
1878 | static struct io_kiocb *io_get_fallback_req(struct io_ring_ctx *ctx) | |
1879 | { | |
1880 | struct io_kiocb *req; | |
1881 | ||
1882 | req = ctx->fallback_req; | |
dd461af6 | 1883 | if (!test_and_set_bit_lock(0, (unsigned long *) &ctx->fallback_req)) |
0ddf92e8 JA |
1884 | return req; |
1885 | ||
1886 | return NULL; | |
1887 | } | |
1888 | ||
0553b8bd PB |
1889 | static struct io_kiocb *io_alloc_req(struct io_ring_ctx *ctx, |
1890 | struct io_submit_state *state) | |
2b188cc1 | 1891 | { |
f6b6c7d6 | 1892 | if (!state->free_reqs) { |
291b2821 | 1893 | gfp_t gfp = GFP_KERNEL | __GFP_NOWARN; |
2579f913 JA |
1894 | size_t sz; |
1895 | int ret; | |
1896 | ||
1897 | sz = min_t(size_t, state->ios_left, ARRAY_SIZE(state->reqs)); | |
fd6fab2c JA |
1898 | ret = kmem_cache_alloc_bulk(req_cachep, gfp, sz, state->reqs); |
1899 | ||
1900 | /* | |
1901 | * Bulk alloc is all-or-nothing. If we fail to get a batch, | |
1902 | * retry single alloc to be on the safe side. | |
1903 | */ | |
1904 | if (unlikely(ret <= 0)) { | |
1905 | state->reqs[0] = kmem_cache_alloc(req_cachep, gfp); | |
1906 | if (!state->reqs[0]) | |
0ddf92e8 | 1907 | goto fallback; |
fd6fab2c JA |
1908 | ret = 1; |
1909 | } | |
291b2821 | 1910 | state->free_reqs = ret; |
2b188cc1 JA |
1911 | } |
1912 | ||
291b2821 PB |
1913 | state->free_reqs--; |
1914 | return state->reqs[state->free_reqs]; | |
0ddf92e8 | 1915 | fallback: |
0553b8bd | 1916 | return io_get_fallback_req(ctx); |
2b188cc1 JA |
1917 | } |
1918 | ||
8da11c19 PB |
1919 | static inline void io_put_file(struct io_kiocb *req, struct file *file, |
1920 | bool fixed) | |
1921 | { | |
1922 | if (fixed) | |
05589553 | 1923 | percpu_ref_put(req->fixed_file_refs); |
8da11c19 PB |
1924 | else |
1925 | fput(file); | |
1926 | } | |
1927 | ||
4edf20f9 | 1928 | static void io_dismantle_req(struct io_kiocb *req) |
2b188cc1 | 1929 | { |
3ca405eb | 1930 | io_clean_op(req); |
929a3af9 | 1931 | |
e8c2bc1f JA |
1932 | if (req->async_data) |
1933 | kfree(req->async_data); | |
8da11c19 PB |
1934 | if (req->file) |
1935 | io_put_file(req, req->file, (req->flags & REQ_F_FIXED_FILE)); | |
fcb323cc | 1936 | |
4edf20f9 | 1937 | io_req_clean_work(req); |
e65ef56d JA |
1938 | } |
1939 | ||
216578e5 | 1940 | static void __io_free_req(struct io_kiocb *req) |
c6ca97b3 | 1941 | { |
0f212204 | 1942 | struct io_uring_task *tctx = req->task->io_uring; |
51a4cc11 | 1943 | struct io_ring_ctx *ctx = req->ctx; |
c6ca97b3 | 1944 | |
216578e5 | 1945 | io_dismantle_req(req); |
c6ca97b3 | 1946 | |
d8a6df10 | 1947 | percpu_counter_dec(&tctx->inflight); |
fdaf083c | 1948 | if (atomic_read(&tctx->in_idle)) |
0f212204 | 1949 | wake_up(&tctx->wait); |
e3bc8e9d JA |
1950 | put_task_struct(req->task); |
1951 | ||
b1e50e54 PB |
1952 | if (likely(!io_is_fallback_req(req))) |
1953 | kmem_cache_free(req_cachep, req); | |
1954 | else | |
ecfc5177 PB |
1955 | clear_bit_unlock(0, (unsigned long *) &ctx->fallback_req); |
1956 | percpu_ref_put(&ctx->refs); | |
e65ef56d JA |
1957 | } |
1958 | ||
f2f87370 PB |
1959 | static inline void io_remove_next_linked(struct io_kiocb *req) |
1960 | { | |
1961 | struct io_kiocb *nxt = req->link; | |
1962 | ||
1963 | req->link = nxt->link; | |
1964 | nxt->link = NULL; | |
1965 | } | |
1966 | ||
c9abd7ad | 1967 | static void io_kill_linked_timeout(struct io_kiocb *req) |
2665abfd | 1968 | { |
a197f664 | 1969 | struct io_ring_ctx *ctx = req->ctx; |
7c86ffee | 1970 | struct io_kiocb *link; |
c9abd7ad PB |
1971 | bool cancelled = false; |
1972 | unsigned long flags; | |
7c86ffee | 1973 | |
c9abd7ad | 1974 | spin_lock_irqsave(&ctx->completion_lock, flags); |
f2f87370 PB |
1975 | link = req->link; |
1976 | ||
900fad45 PB |
1977 | /* |
1978 | * Can happen if a linked timeout fired and link had been like | |
1979 | * req -> link t-out -> link t-out [-> ...] | |
1980 | */ | |
c9abd7ad PB |
1981 | if (link && (link->flags & REQ_F_LTIMEOUT_ACTIVE)) { |
1982 | struct io_timeout_data *io = link->async_data; | |
1983 | int ret; | |
7c86ffee | 1984 | |
f2f87370 | 1985 | io_remove_next_linked(req); |
90cd7e42 | 1986 | link->timeout.head = NULL; |
c9abd7ad PB |
1987 | ret = hrtimer_try_to_cancel(&io->timer); |
1988 | if (ret != -1) { | |
1989 | io_cqring_fill_event(link, -ECANCELED); | |
1990 | io_commit_cqring(ctx); | |
1991 | cancelled = true; | |
1992 | } | |
1993 | } | |
7c86ffee | 1994 | req->flags &= ~REQ_F_LINK_TIMEOUT; |
216578e5 | 1995 | spin_unlock_irqrestore(&ctx->completion_lock, flags); |
ab0b6451 | 1996 | |
c9abd7ad | 1997 | if (cancelled) { |
7c86ffee | 1998 | io_cqring_ev_posted(ctx); |
c9abd7ad PB |
1999 | io_put_req(link); |
2000 | } | |
7c86ffee PB |
2001 | } |
2002 | ||
9e645e11 | 2003 | |
d148ca4b | 2004 | static void io_fail_links(struct io_kiocb *req) |
9e645e11 | 2005 | { |
f2f87370 | 2006 | struct io_kiocb *link, *nxt; |
2665abfd | 2007 | struct io_ring_ctx *ctx = req->ctx; |
d148ca4b | 2008 | unsigned long flags; |
9e645e11 | 2009 | |
d148ca4b | 2010 | spin_lock_irqsave(&ctx->completion_lock, flags); |
f2f87370 PB |
2011 | link = req->link; |
2012 | req->link = NULL; | |
9e645e11 | 2013 | |
f2f87370 PB |
2014 | while (link) { |
2015 | nxt = link->link; | |
2016 | link->link = NULL; | |
2665abfd | 2017 | |
f2f87370 | 2018 | trace_io_uring_fail_link(req, link); |
7c86ffee | 2019 | io_cqring_fill_event(link, -ECANCELED); |
216578e5 PB |
2020 | |
2021 | /* | |
2022 | * It's ok to free under spinlock as they're not linked anymore, | |
2023 | * but avoid REQ_F_WORK_INITIALIZED because it may deadlock on | |
2024 | * work.fs->lock. | |
2025 | */ | |
2026 | if (link->flags & REQ_F_WORK_INITIALIZED) | |
2027 | io_put_req_deferred(link, 2); | |
2028 | else | |
2029 | io_double_put_req(link); | |
f2f87370 | 2030 | link = nxt; |
9e645e11 | 2031 | } |
2665abfd | 2032 | io_commit_cqring(ctx); |
216578e5 | 2033 | spin_unlock_irqrestore(&ctx->completion_lock, flags); |
9e645e11 | 2034 | |
2665abfd | 2035 | io_cqring_ev_posted(ctx); |
9e645e11 JA |
2036 | } |
2037 | ||
3fa5e0f3 | 2038 | static struct io_kiocb *__io_req_find_next(struct io_kiocb *req) |
c69f8dbe | 2039 | { |
7c86ffee PB |
2040 | if (req->flags & REQ_F_LINK_TIMEOUT) |
2041 | io_kill_linked_timeout(req); | |
944e58bf | 2042 | |
9e645e11 JA |
2043 | /* |
2044 | * If LINK is set, we have dependent requests in this chain. If we | |
2045 | * didn't fail this request, queue the first one up, moving any other | |
2046 | * dependencies to the next request. In case of failure, fail the rest | |
2047 | * of the chain. | |
2048 | */ | |
f2f87370 PB |
2049 | if (likely(!(req->flags & REQ_F_FAIL_LINK))) { |
2050 | struct io_kiocb *nxt = req->link; | |
2051 | ||
2052 | req->link = NULL; | |
2053 | return nxt; | |
2054 | } | |
9b5f7bd9 PB |
2055 | io_fail_links(req); |
2056 | return NULL; | |
4d7dd462 | 2057 | } |
9e645e11 | 2058 | |
f2f87370 | 2059 | static inline struct io_kiocb *io_req_find_next(struct io_kiocb *req) |
3fa5e0f3 | 2060 | { |
f2f87370 | 2061 | if (likely(!(req->link) && !(req->flags & REQ_F_LINK_TIMEOUT))) |
3fa5e0f3 PB |
2062 | return NULL; |
2063 | return __io_req_find_next(req); | |
2064 | } | |
2065 | ||
87c4311f | 2066 | static int io_req_task_work_add(struct io_kiocb *req, bool twa_signal_ok) |
c2c4c83c JA |
2067 | { |
2068 | struct task_struct *tsk = req->task; | |
2069 | struct io_ring_ctx *ctx = req->ctx; | |
91989c70 JA |
2070 | enum task_work_notify_mode notify; |
2071 | int ret; | |
c2c4c83c | 2072 | |
6200b0ae JA |
2073 | if (tsk->flags & PF_EXITING) |
2074 | return -ESRCH; | |
2075 | ||
c2c4c83c | 2076 | /* |
0ba9c9ed JA |
2077 | * SQPOLL kernel thread doesn't need notification, just a wakeup. For |
2078 | * all other cases, use TWA_SIGNAL unconditionally to ensure we're | |
2079 | * processing task_work. There's no reliable way to tell if TWA_RESUME | |
2080 | * will do the job. | |
c2c4c83c | 2081 | */ |
91989c70 | 2082 | notify = TWA_NONE; |
fd7d6de2 | 2083 | if (!(ctx->flags & IORING_SETUP_SQPOLL) && twa_signal_ok) |
c2c4c83c JA |
2084 | notify = TWA_SIGNAL; |
2085 | ||
87c4311f | 2086 | ret = task_work_add(tsk, &req->task_work, notify); |
c2c4c83c JA |
2087 | if (!ret) |
2088 | wake_up_process(tsk); | |
0ba9c9ed | 2089 | |
c2c4c83c JA |
2090 | return ret; |
2091 | } | |
2092 | ||
c40f6379 JA |
2093 | static void __io_req_task_cancel(struct io_kiocb *req, int error) |
2094 | { | |
2095 | struct io_ring_ctx *ctx = req->ctx; | |
2096 | ||
2097 | spin_lock_irq(&ctx->completion_lock); | |
2098 | io_cqring_fill_event(req, error); | |
2099 | io_commit_cqring(ctx); | |
2100 | spin_unlock_irq(&ctx->completion_lock); | |
2101 | ||
2102 | io_cqring_ev_posted(ctx); | |
2103 | req_set_fail_links(req); | |
2104 | io_double_put_req(req); | |
2105 | } | |
2106 | ||
2107 | static void io_req_task_cancel(struct callback_head *cb) | |
2108 | { | |
2109 | struct io_kiocb *req = container_of(cb, struct io_kiocb, task_work); | |
87ceb6a6 | 2110 | struct io_ring_ctx *ctx = req->ctx; |
c40f6379 JA |
2111 | |
2112 | __io_req_task_cancel(req, -ECANCELED); | |
87ceb6a6 | 2113 | percpu_ref_put(&ctx->refs); |
c40f6379 JA |
2114 | } |
2115 | ||
2116 | static void __io_req_task_submit(struct io_kiocb *req) | |
2117 | { | |
2118 | struct io_ring_ctx *ctx = req->ctx; | |
2119 | ||
1a38ffc9 PB |
2120 | if (!__io_sq_thread_acquire_mm(ctx) && |
2121 | !__io_sq_thread_acquire_files(ctx)) { | |
c40f6379 | 2122 | mutex_lock(&ctx->uring_lock); |
c1379e24 | 2123 | __io_queue_sqe(req, NULL); |
c40f6379 JA |
2124 | mutex_unlock(&ctx->uring_lock); |
2125 | } else { | |
2126 | __io_req_task_cancel(req, -EFAULT); | |
2127 | } | |
2128 | } | |
2129 | ||
2130 | static void io_req_task_submit(struct callback_head *cb) | |
2131 | { | |
2132 | struct io_kiocb *req = container_of(cb, struct io_kiocb, task_work); | |
6d816e08 | 2133 | struct io_ring_ctx *ctx = req->ctx; |
c40f6379 JA |
2134 | |
2135 | __io_req_task_submit(req); | |
6d816e08 | 2136 | percpu_ref_put(&ctx->refs); |
c40f6379 JA |
2137 | } |
2138 | ||
2139 | static void io_req_task_queue(struct io_kiocb *req) | |
2140 | { | |
c40f6379 JA |
2141 | int ret; |
2142 | ||
2143 | init_task_work(&req->task_work, io_req_task_submit); | |
6d816e08 | 2144 | percpu_ref_get(&req->ctx->refs); |
c40f6379 | 2145 | |
87c4311f | 2146 | ret = io_req_task_work_add(req, true); |
c40f6379 | 2147 | if (unlikely(ret)) { |
c2c4c83c JA |
2148 | struct task_struct *tsk; |
2149 | ||
c40f6379 JA |
2150 | init_task_work(&req->task_work, io_req_task_cancel); |
2151 | tsk = io_wq_get_task(req->ctx->io_wq); | |
91989c70 | 2152 | task_work_add(tsk, &req->task_work, TWA_NONE); |
c2c4c83c | 2153 | wake_up_process(tsk); |
c40f6379 | 2154 | } |
c40f6379 JA |
2155 | } |
2156 | ||
f2f87370 | 2157 | static inline void io_queue_next(struct io_kiocb *req) |
c69f8dbe | 2158 | { |
9b5f7bd9 | 2159 | struct io_kiocb *nxt = io_req_find_next(req); |
944e58bf PB |
2160 | |
2161 | if (nxt) | |
906a8c3f | 2162 | io_req_task_queue(nxt); |
c69f8dbe JL |
2163 | } |
2164 | ||
c3524383 | 2165 | static void io_free_req(struct io_kiocb *req) |
7a743e22 | 2166 | { |
c3524383 PB |
2167 | io_queue_next(req); |
2168 | __io_free_req(req); | |
2169 | } | |
8766dd51 | 2170 | |
2d6500d4 PB |
2171 | struct req_batch { |
2172 | void *reqs[IO_IOPOLL_BATCH]; | |
2173 | int to_free; | |
7a743e22 | 2174 | |
5af1d13e PB |
2175 | struct task_struct *task; |
2176 | int task_refs; | |
2d6500d4 PB |
2177 | }; |
2178 | ||
5af1d13e PB |
2179 | static inline void io_init_req_batch(struct req_batch *rb) |
2180 | { | |
2181 | rb->to_free = 0; | |
2182 | rb->task_refs = 0; | |
2183 | rb->task = NULL; | |
2184 | } | |
2185 | ||
2d6500d4 PB |
2186 | static void __io_req_free_batch_flush(struct io_ring_ctx *ctx, |
2187 | struct req_batch *rb) | |
2188 | { | |
2189 | kmem_cache_free_bulk(req_cachep, rb->to_free, rb->reqs); | |
2190 | percpu_ref_put_many(&ctx->refs, rb->to_free); | |
2191 | rb->to_free = 0; | |
2192 | } | |
2193 | ||
2194 | static void io_req_free_batch_finish(struct io_ring_ctx *ctx, | |
2195 | struct req_batch *rb) | |
2196 | { | |
2197 | if (rb->to_free) | |
2198 | __io_req_free_batch_flush(ctx, rb); | |
5af1d13e | 2199 | if (rb->task) { |
d8a6df10 JA |
2200 | struct io_uring_task *tctx = rb->task->io_uring; |
2201 | ||
2202 | percpu_counter_sub(&tctx->inflight, rb->task_refs); | |
5af1d13e PB |
2203 | put_task_struct_many(rb->task, rb->task_refs); |
2204 | rb->task = NULL; | |
2205 | } | |
2d6500d4 PB |
2206 | } |
2207 | ||
2208 | static void io_req_free_batch(struct req_batch *rb, struct io_kiocb *req) | |
2209 | { | |
2210 | if (unlikely(io_is_fallback_req(req))) { | |
2211 | io_free_req(req); | |
2212 | return; | |
2213 | } | |
f2f87370 | 2214 | io_queue_next(req); |
2d6500d4 | 2215 | |
e3bc8e9d | 2216 | if (req->task != rb->task) { |
0f212204 | 2217 | if (rb->task) { |
d8a6df10 JA |
2218 | struct io_uring_task *tctx = rb->task->io_uring; |
2219 | ||
2220 | percpu_counter_sub(&tctx->inflight, rb->task_refs); | |
e3bc8e9d | 2221 | put_task_struct_many(rb->task, rb->task_refs); |
5af1d13e | 2222 | } |
e3bc8e9d JA |
2223 | rb->task = req->task; |
2224 | rb->task_refs = 0; | |
5af1d13e | 2225 | } |
e3bc8e9d | 2226 | rb->task_refs++; |
5af1d13e | 2227 | |
4edf20f9 | 2228 | io_dismantle_req(req); |
2d6500d4 PB |
2229 | rb->reqs[rb->to_free++] = req; |
2230 | if (unlikely(rb->to_free == ARRAY_SIZE(rb->reqs))) | |
2231 | __io_req_free_batch_flush(req->ctx, rb); | |
7a743e22 PB |
2232 | } |
2233 | ||
ba816ad6 JA |
2234 | /* |
2235 | * Drop reference to request, return next in chain (if there is one) if this | |
2236 | * was the last reference to this request. | |
2237 | */ | |
9b5f7bd9 | 2238 | static struct io_kiocb *io_put_req_find_next(struct io_kiocb *req) |
e65ef56d | 2239 | { |
9b5f7bd9 PB |
2240 | struct io_kiocb *nxt = NULL; |
2241 | ||
2a44f467 | 2242 | if (refcount_dec_and_test(&req->refs)) { |
9b5f7bd9 | 2243 | nxt = io_req_find_next(req); |
4d7dd462 | 2244 | __io_free_req(req); |
2a44f467 | 2245 | } |
9b5f7bd9 | 2246 | return nxt; |
2b188cc1 JA |
2247 | } |
2248 | ||
e65ef56d JA |
2249 | static void io_put_req(struct io_kiocb *req) |
2250 | { | |
2251 | if (refcount_dec_and_test(&req->refs)) | |
2252 | io_free_req(req); | |
2b188cc1 JA |
2253 | } |
2254 | ||
216578e5 PB |
2255 | static void io_put_req_deferred_cb(struct callback_head *cb) |
2256 | { | |
2257 | struct io_kiocb *req = container_of(cb, struct io_kiocb, task_work); | |
2258 | ||
2259 | io_free_req(req); | |
2260 | } | |
2261 | ||
2262 | static void io_free_req_deferred(struct io_kiocb *req) | |
2263 | { | |
2264 | int ret; | |
2265 | ||
2266 | init_task_work(&req->task_work, io_put_req_deferred_cb); | |
2267 | ret = io_req_task_work_add(req, true); | |
2268 | if (unlikely(ret)) { | |
2269 | struct task_struct *tsk; | |
2270 | ||
2271 | tsk = io_wq_get_task(req->ctx->io_wq); | |
91989c70 | 2272 | task_work_add(tsk, &req->task_work, TWA_NONE); |
216578e5 PB |
2273 | wake_up_process(tsk); |
2274 | } | |
2275 | } | |
2276 | ||
2277 | static inline void io_put_req_deferred(struct io_kiocb *req, int refs) | |
2278 | { | |
2279 | if (refcount_sub_and_test(refs, &req->refs)) | |
2280 | io_free_req_deferred(req); | |
2281 | } | |
2282 | ||
f4db7182 | 2283 | static struct io_wq_work *io_steal_work(struct io_kiocb *req) |
7a743e22 | 2284 | { |
6df1db6b | 2285 | struct io_kiocb *nxt; |
f4db7182 | 2286 | |
7a743e22 | 2287 | /* |
f4db7182 PB |
2288 | * A ref is owned by io-wq in which context we're. So, if that's the |
2289 | * last one, it's safe to steal next work. False negatives are Ok, | |
2290 | * it just will be re-punted async in io_put_work() | |
7a743e22 | 2291 | */ |
f4db7182 PB |
2292 | if (refcount_read(&req->refs) != 1) |
2293 | return NULL; | |
7a743e22 | 2294 | |
9b5f7bd9 | 2295 | nxt = io_req_find_next(req); |
6df1db6b | 2296 | return nxt ? &nxt->work : NULL; |
7a743e22 PB |
2297 | } |
2298 | ||
978db57e JA |
2299 | static void io_double_put_req(struct io_kiocb *req) |
2300 | { | |
2301 | /* drop both submit and complete references */ | |
2302 | if (refcount_sub_and_test(2, &req->refs)) | |
2303 | io_free_req(req); | |
2304 | } | |
2305 | ||
1d7bb1d5 | 2306 | static unsigned io_cqring_events(struct io_ring_ctx *ctx, bool noflush) |
a3a0e43f | 2307 | { |
84f97dc2 JA |
2308 | struct io_rings *rings = ctx->rings; |
2309 | ||
ad3eb2c8 JA |
2310 | if (test_bit(0, &ctx->cq_check_overflow)) { |
2311 | /* | |
2312 | * noflush == true is from the waitqueue handler, just ensure | |
2313 | * we wake up the task, and the next invocation will flush the | |
2314 | * entries. We cannot safely to it from here. | |
2315 | */ | |
2316 | if (noflush && !list_empty(&ctx->cq_overflow_list)) | |
2317 | return -1U; | |
1d7bb1d5 | 2318 | |
e6c8aa9a | 2319 | io_cqring_overflow_flush(ctx, false, NULL, NULL); |
ad3eb2c8 | 2320 | } |
1d7bb1d5 | 2321 | |
a3a0e43f JA |
2322 | /* See comment at the top of this file */ |
2323 | smp_rmb(); | |
ad3eb2c8 | 2324 | return ctx->cached_cq_tail - READ_ONCE(rings->cq.head); |
a3a0e43f JA |
2325 | } |
2326 | ||
fb5ccc98 PB |
2327 | static inline unsigned int io_sqring_entries(struct io_ring_ctx *ctx) |
2328 | { | |
2329 | struct io_rings *rings = ctx->rings; | |
2330 | ||
2331 | /* make sure SQ entry isn't read before tail */ | |
2332 | return smp_load_acquire(&rings->sq.tail) - ctx->cached_sq_head; | |
2333 | } | |
2334 | ||
8ff069bf | 2335 | static unsigned int io_put_kbuf(struct io_kiocb *req, struct io_buffer *kbuf) |
e94f141b | 2336 | { |
8ff069bf | 2337 | unsigned int cflags; |
e94f141b | 2338 | |
bcda7baa JA |
2339 | cflags = kbuf->bid << IORING_CQE_BUFFER_SHIFT; |
2340 | cflags |= IORING_CQE_F_BUFFER; | |
0e1b6fe3 | 2341 | req->flags &= ~REQ_F_BUFFER_SELECTED; |
bcda7baa JA |
2342 | kfree(kbuf); |
2343 | return cflags; | |
e94f141b JA |
2344 | } |
2345 | ||
8ff069bf | 2346 | static inline unsigned int io_put_rw_kbuf(struct io_kiocb *req) |
bcda7baa | 2347 | { |
4d954c25 | 2348 | struct io_buffer *kbuf; |
bcda7baa | 2349 | |
4d954c25 | 2350 | kbuf = (struct io_buffer *) (unsigned long) req->rw.addr; |
8ff069bf PB |
2351 | return io_put_kbuf(req, kbuf); |
2352 | } | |
2353 | ||
4c6e277c JA |
2354 | static inline bool io_run_task_work(void) |
2355 | { | |
6200b0ae JA |
2356 | /* |
2357 | * Not safe to run on exiting task, and the task_work handling will | |
2358 | * not add work to such a task. | |
2359 | */ | |
2360 | if (unlikely(current->flags & PF_EXITING)) | |
2361 | return false; | |
4c6e277c JA |
2362 | if (current->task_works) { |
2363 | __set_current_state(TASK_RUNNING); | |
2364 | task_work_run(); | |
2365 | return true; | |
2366 | } | |
2367 | ||
2368 | return false; | |
bcda7baa JA |
2369 | } |
2370 | ||
bbde017a XW |
2371 | static void io_iopoll_queue(struct list_head *again) |
2372 | { | |
2373 | struct io_kiocb *req; | |
2374 | ||
2375 | do { | |
d21ffe7e PB |
2376 | req = list_first_entry(again, struct io_kiocb, inflight_entry); |
2377 | list_del(&req->inflight_entry); | |
81b68a5c | 2378 | __io_complete_rw(req, -EAGAIN, 0, NULL); |
bbde017a XW |
2379 | } while (!list_empty(again)); |
2380 | } | |
2381 | ||
def596e9 JA |
2382 | /* |
2383 | * Find and free completed poll iocbs | |
2384 | */ | |
2385 | static void io_iopoll_complete(struct io_ring_ctx *ctx, unsigned int *nr_events, | |
2386 | struct list_head *done) | |
2387 | { | |
8237e045 | 2388 | struct req_batch rb; |
def596e9 | 2389 | struct io_kiocb *req; |
bbde017a XW |
2390 | LIST_HEAD(again); |
2391 | ||
2392 | /* order with ->result store in io_complete_rw_iopoll() */ | |
2393 | smp_rmb(); | |
def596e9 | 2394 | |
5af1d13e | 2395 | io_init_req_batch(&rb); |
def596e9 | 2396 | while (!list_empty(done)) { |
bcda7baa JA |
2397 | int cflags = 0; |
2398 | ||
d21ffe7e | 2399 | req = list_first_entry(done, struct io_kiocb, inflight_entry); |
bbde017a | 2400 | if (READ_ONCE(req->result) == -EAGAIN) { |
56450c20 | 2401 | req->result = 0; |
bbde017a | 2402 | req->iopoll_completed = 0; |
d21ffe7e | 2403 | list_move_tail(&req->inflight_entry, &again); |
bbde017a XW |
2404 | continue; |
2405 | } | |
d21ffe7e | 2406 | list_del(&req->inflight_entry); |
def596e9 | 2407 | |
bcda7baa | 2408 | if (req->flags & REQ_F_BUFFER_SELECTED) |
8ff069bf | 2409 | cflags = io_put_rw_kbuf(req); |
bcda7baa JA |
2410 | |
2411 | __io_cqring_fill_event(req, req->result, cflags); | |
def596e9 JA |
2412 | (*nr_events)++; |
2413 | ||
c3524383 | 2414 | if (refcount_dec_and_test(&req->refs)) |
2d6500d4 | 2415 | io_req_free_batch(&rb, req); |
def596e9 | 2416 | } |
def596e9 | 2417 | |
09bb8394 | 2418 | io_commit_cqring(ctx); |
32b2244a XW |
2419 | if (ctx->flags & IORING_SETUP_SQPOLL) |
2420 | io_cqring_ev_posted(ctx); | |
2d6500d4 | 2421 | io_req_free_batch_finish(ctx, &rb); |
581f9810 | 2422 | |
bbde017a XW |
2423 | if (!list_empty(&again)) |
2424 | io_iopoll_queue(&again); | |
581f9810 BM |
2425 | } |
2426 | ||
def596e9 JA |
2427 | static int io_do_iopoll(struct io_ring_ctx *ctx, unsigned int *nr_events, |
2428 | long min) | |
2429 | { | |
2430 | struct io_kiocb *req, *tmp; | |
2431 | LIST_HEAD(done); | |
2432 | bool spin; | |
2433 | int ret; | |
2434 | ||
2435 | /* | |
2436 | * Only spin for completions if we don't have multiple devices hanging | |
2437 | * off our complete list, and we're under the requested amount. | |
2438 | */ | |
2439 | spin = !ctx->poll_multi_file && *nr_events < min; | |
2440 | ||
2441 | ret = 0; | |
d21ffe7e | 2442 | list_for_each_entry_safe(req, tmp, &ctx->iopoll_list, inflight_entry) { |
9adbd45d | 2443 | struct kiocb *kiocb = &req->rw.kiocb; |
def596e9 JA |
2444 | |
2445 | /* | |
581f9810 BM |
2446 | * Move completed and retryable entries to our local lists. |
2447 | * If we find a request that requires polling, break out | |
2448 | * and complete those lists first, if we have entries there. | |
def596e9 | 2449 | */ |
65a6543d | 2450 | if (READ_ONCE(req->iopoll_completed)) { |
d21ffe7e | 2451 | list_move_tail(&req->inflight_entry, &done); |
def596e9 JA |
2452 | continue; |
2453 | } | |
2454 | if (!list_empty(&done)) | |
2455 | break; | |
2456 | ||
2457 | ret = kiocb->ki_filp->f_op->iopoll(kiocb, spin); | |
2458 | if (ret < 0) | |
2459 | break; | |
2460 | ||
3aadc23e PB |
2461 | /* iopoll may have completed current req */ |
2462 | if (READ_ONCE(req->iopoll_completed)) | |
d21ffe7e | 2463 | list_move_tail(&req->inflight_entry, &done); |
3aadc23e | 2464 | |
def596e9 JA |
2465 | if (ret && spin) |
2466 | spin = false; | |
2467 | ret = 0; | |
2468 | } | |
2469 | ||
2470 | if (!list_empty(&done)) | |
2471 | io_iopoll_complete(ctx, nr_events, &done); | |
2472 | ||
2473 | return ret; | |
2474 | } | |
2475 | ||
2476 | /* | |
d195a66e | 2477 | * Poll for a minimum of 'min' events. Note that if min == 0 we consider that a |
def596e9 JA |
2478 | * non-spinning poll check - we'll still enter the driver poll loop, but only |
2479 | * as a non-spinning completion check. | |
2480 | */ | |
2481 | static int io_iopoll_getevents(struct io_ring_ctx *ctx, unsigned int *nr_events, | |
2482 | long min) | |
2483 | { | |
540e32a0 | 2484 | while (!list_empty(&ctx->iopoll_list) && !need_resched()) { |
def596e9 JA |
2485 | int ret; |
2486 | ||
2487 | ret = io_do_iopoll(ctx, nr_events, min); | |
2488 | if (ret < 0) | |
2489 | return ret; | |
eba0a4dd | 2490 | if (*nr_events >= min) |
def596e9 JA |
2491 | return 0; |
2492 | } | |
2493 | ||
2494 | return 1; | |
2495 | } | |
2496 | ||
2497 | /* | |
2498 | * We can't just wait for polled events to come to us, we have to actively | |
2499 | * find and complete them. | |
2500 | */ | |
b2edc0a7 | 2501 | static void io_iopoll_try_reap_events(struct io_ring_ctx *ctx) |
def596e9 JA |
2502 | { |
2503 | if (!(ctx->flags & IORING_SETUP_IOPOLL)) | |
2504 | return; | |
2505 | ||
2506 | mutex_lock(&ctx->uring_lock); | |
540e32a0 | 2507 | while (!list_empty(&ctx->iopoll_list)) { |
def596e9 JA |
2508 | unsigned int nr_events = 0; |
2509 | ||
b2edc0a7 | 2510 | io_do_iopoll(ctx, &nr_events, 0); |
08f5439f | 2511 | |
b2edc0a7 PB |
2512 | /* let it sleep and repeat later if can't complete a request */ |
2513 | if (nr_events == 0) | |
2514 | break; | |
08f5439f JA |
2515 | /* |
2516 | * Ensure we allow local-to-the-cpu processing to take place, | |
2517 | * in this case we need to ensure that we reap all events. | |
3fcee5a6 | 2518 | * Also let task_work, etc. to progress by releasing the mutex |
08f5439f | 2519 | */ |
3fcee5a6 PB |
2520 | if (need_resched()) { |
2521 | mutex_unlock(&ctx->uring_lock); | |
2522 | cond_resched(); | |
2523 | mutex_lock(&ctx->uring_lock); | |
2524 | } | |
def596e9 JA |
2525 | } |
2526 | mutex_unlock(&ctx->uring_lock); | |
2527 | } | |
2528 | ||
7668b92a | 2529 | static int io_iopoll_check(struct io_ring_ctx *ctx, long min) |
def596e9 | 2530 | { |
7668b92a | 2531 | unsigned int nr_events = 0; |
2b2ed975 | 2532 | int iters = 0, ret = 0; |
500f9fba | 2533 | |
c7849be9 XW |
2534 | /* |
2535 | * We disallow the app entering submit/complete with polling, but we | |
2536 | * still need to lock the ring to prevent racing with polled issue | |
2537 | * that got punted to a workqueue. | |
2538 | */ | |
2539 | mutex_lock(&ctx->uring_lock); | |
def596e9 | 2540 | do { |
a3a0e43f JA |
2541 | /* |
2542 | * Don't enter poll loop if we already have events pending. | |
2543 | * If we do, we can potentially be spinning for commands that | |
2544 | * already triggered a CQE (eg in error). | |
2545 | */ | |
1d7bb1d5 | 2546 | if (io_cqring_events(ctx, false)) |
a3a0e43f JA |
2547 | break; |
2548 | ||
500f9fba JA |
2549 | /* |
2550 | * If a submit got punted to a workqueue, we can have the | |
2551 | * application entering polling for a command before it gets | |
2552 | * issued. That app will hold the uring_lock for the duration | |
2553 | * of the poll right here, so we need to take a breather every | |
2554 | * now and then to ensure that the issue has a chance to add | |
2555 | * the poll to the issued list. Otherwise we can spin here | |
2556 | * forever, while the workqueue is stuck trying to acquire the | |
2557 | * very same mutex. | |
2558 | */ | |
2559 | if (!(++iters & 7)) { | |
2560 | mutex_unlock(&ctx->uring_lock); | |
4c6e277c | 2561 | io_run_task_work(); |
500f9fba JA |
2562 | mutex_lock(&ctx->uring_lock); |
2563 | } | |
2564 | ||
7668b92a | 2565 | ret = io_iopoll_getevents(ctx, &nr_events, min); |
def596e9 JA |
2566 | if (ret <= 0) |
2567 | break; | |
2568 | ret = 0; | |
7668b92a | 2569 | } while (min && !nr_events && !need_resched()); |
def596e9 | 2570 | |
500f9fba | 2571 | mutex_unlock(&ctx->uring_lock); |
def596e9 JA |
2572 | return ret; |
2573 | } | |
2574 | ||
491381ce | 2575 | static void kiocb_end_write(struct io_kiocb *req) |
2b188cc1 | 2576 | { |
491381ce JA |
2577 | /* |
2578 | * Tell lockdep we inherited freeze protection from submission | |
2579 | * thread. | |
2580 | */ | |
2581 | if (req->flags & REQ_F_ISREG) { | |
2582 | struct inode *inode = file_inode(req->file); | |
2b188cc1 | 2583 | |
491381ce | 2584 | __sb_writers_acquired(inode->i_sb, SB_FREEZE_WRITE); |
2b188cc1 | 2585 | } |
491381ce | 2586 | file_end_write(req->file); |
2b188cc1 JA |
2587 | } |
2588 | ||
a1d7c393 JA |
2589 | static void io_complete_rw_common(struct kiocb *kiocb, long res, |
2590 | struct io_comp_state *cs) | |
2b188cc1 | 2591 | { |
9adbd45d | 2592 | struct io_kiocb *req = container_of(kiocb, struct io_kiocb, rw.kiocb); |
bcda7baa | 2593 | int cflags = 0; |
2b188cc1 | 2594 | |
491381ce JA |
2595 | if (kiocb->ki_flags & IOCB_WRITE) |
2596 | kiocb_end_write(req); | |
2b188cc1 | 2597 | |
4e88d6e7 JA |
2598 | if (res != req->result) |
2599 | req_set_fail_links(req); | |
bcda7baa | 2600 | if (req->flags & REQ_F_BUFFER_SELECTED) |
8ff069bf | 2601 | cflags = io_put_rw_kbuf(req); |
a1d7c393 | 2602 | __io_req_complete(req, res, cflags, cs); |
ba816ad6 JA |
2603 | } |
2604 | ||
b63534c4 JA |
2605 | #ifdef CONFIG_BLOCK |
2606 | static bool io_resubmit_prep(struct io_kiocb *req, int error) | |
2607 | { | |
2608 | struct iovec inline_vecs[UIO_FASTIOV], *iovec = inline_vecs; | |
2609 | ssize_t ret = -ECANCELED; | |
2610 | struct iov_iter iter; | |
2611 | int rw; | |
2612 | ||
2613 | if (error) { | |
2614 | ret = error; | |
2615 | goto end_req; | |
2616 | } | |
2617 | ||
2618 | switch (req->opcode) { | |
2619 | case IORING_OP_READV: | |
2620 | case IORING_OP_READ_FIXED: | |
2621 | case IORING_OP_READ: | |
2622 | rw = READ; | |
2623 | break; | |
2624 | case IORING_OP_WRITEV: | |
2625 | case IORING_OP_WRITE_FIXED: | |
2626 | case IORING_OP_WRITE: | |
2627 | rw = WRITE; | |
2628 | break; | |
2629 | default: | |
2630 | printk_once(KERN_WARNING "io_uring: bad opcode in resubmit %d\n", | |
2631 | req->opcode); | |
2632 | goto end_req; | |
2633 | } | |
2634 | ||
e8c2bc1f | 2635 | if (!req->async_data) { |
8f3d7496 JA |
2636 | ret = io_import_iovec(rw, req, &iovec, &iter, false); |
2637 | if (ret < 0) | |
2638 | goto end_req; | |
2639 | ret = io_setup_async_rw(req, iovec, inline_vecs, &iter, false); | |
2640 | if (!ret) | |
2641 | return true; | |
2642 | kfree(iovec); | |
2643 | } else { | |
b63534c4 | 2644 | return true; |
8f3d7496 | 2645 | } |
b63534c4 | 2646 | end_req: |
b63534c4 | 2647 | req_set_fail_links(req); |
b63534c4 JA |
2648 | return false; |
2649 | } | |
b63534c4 JA |
2650 | #endif |
2651 | ||
2652 | static bool io_rw_reissue(struct io_kiocb *req, long res) | |
2653 | { | |
2654 | #ifdef CONFIG_BLOCK | |
355afaeb | 2655 | umode_t mode = file_inode(req->file)->i_mode; |
b63534c4 JA |
2656 | int ret; |
2657 | ||
355afaeb JA |
2658 | if (!S_ISBLK(mode) && !S_ISREG(mode)) |
2659 | return false; | |
b63534c4 JA |
2660 | if ((res != -EAGAIN && res != -EOPNOTSUPP) || io_wq_current_is_worker()) |
2661 | return false; | |
2662 | ||
28cea78a | 2663 | ret = io_sq_thread_acquire_mm_files(req->ctx, req); |
6d816e08 | 2664 | |
fdee946d JA |
2665 | if (io_resubmit_prep(req, ret)) { |
2666 | refcount_inc(&req->refs); | |
2667 | io_queue_async_work(req); | |
b63534c4 | 2668 | return true; |
fdee946d JA |
2669 | } |
2670 | ||
b63534c4 JA |
2671 | #endif |
2672 | return false; | |
2673 | } | |
2674 | ||
a1d7c393 JA |
2675 | static void __io_complete_rw(struct io_kiocb *req, long res, long res2, |
2676 | struct io_comp_state *cs) | |
2677 | { | |
2678 | if (!io_rw_reissue(req, res)) | |
2679 | io_complete_rw_common(&req->rw.kiocb, res, cs); | |
ba816ad6 JA |
2680 | } |
2681 | ||
2682 | static void io_complete_rw(struct kiocb *kiocb, long res, long res2) | |
2683 | { | |
9adbd45d | 2684 | struct io_kiocb *req = container_of(kiocb, struct io_kiocb, rw.kiocb); |
ba816ad6 | 2685 | |
a1d7c393 | 2686 | __io_complete_rw(req, res, res2, NULL); |
2b188cc1 JA |
2687 | } |
2688 | ||
def596e9 JA |
2689 | static void io_complete_rw_iopoll(struct kiocb *kiocb, long res, long res2) |
2690 | { | |
9adbd45d | 2691 | struct io_kiocb *req = container_of(kiocb, struct io_kiocb, rw.kiocb); |
def596e9 | 2692 | |
491381ce JA |
2693 | if (kiocb->ki_flags & IOCB_WRITE) |
2694 | kiocb_end_write(req); | |
def596e9 | 2695 | |
2d7d6792 | 2696 | if (res != -EAGAIN && res != req->result) |
4e88d6e7 | 2697 | req_set_fail_links(req); |
bbde017a XW |
2698 | |
2699 | WRITE_ONCE(req->result, res); | |
2700 | /* order with io_poll_complete() checking ->result */ | |
cd664b0e PB |
2701 | smp_wmb(); |
2702 | WRITE_ONCE(req->iopoll_completed, 1); | |
def596e9 JA |
2703 | } |
2704 | ||
2705 | /* | |
2706 | * After the iocb has been issued, it's safe to be found on the poll list. | |
2707 | * Adding the kiocb to the list AFTER submission ensures that we don't | |
2708 | * find it from a io_iopoll_getevents() thread before the issuer is done | |
2709 | * accessing the kiocb cookie. | |
2710 | */ | |
2e9dbe90 | 2711 | static void io_iopoll_req_issued(struct io_kiocb *req, bool in_async) |
def596e9 JA |
2712 | { |
2713 | struct io_ring_ctx *ctx = req->ctx; | |
2714 | ||
2715 | /* | |
2716 | * Track whether we have multiple files in our lists. This will impact | |
2717 | * how we do polling eventually, not spinning if we're on potentially | |
2718 | * different devices. | |
2719 | */ | |
540e32a0 | 2720 | if (list_empty(&ctx->iopoll_list)) { |
def596e9 JA |
2721 | ctx->poll_multi_file = false; |
2722 | } else if (!ctx->poll_multi_file) { | |
2723 | struct io_kiocb *list_req; | |
2724 | ||
540e32a0 | 2725 | list_req = list_first_entry(&ctx->iopoll_list, struct io_kiocb, |
d21ffe7e | 2726 | inflight_entry); |
9adbd45d | 2727 | if (list_req->file != req->file) |
def596e9 JA |
2728 | ctx->poll_multi_file = true; |
2729 | } | |
2730 | ||
2731 | /* | |
2732 | * For fast devices, IO may have already completed. If it has, add | |
2733 | * it to the front so we find it first. | |
2734 | */ | |
65a6543d | 2735 | if (READ_ONCE(req->iopoll_completed)) |
d21ffe7e | 2736 | list_add(&req->inflight_entry, &ctx->iopoll_list); |
def596e9 | 2737 | else |
d21ffe7e | 2738 | list_add_tail(&req->inflight_entry, &ctx->iopoll_list); |
bdcd3eab | 2739 | |
2e9dbe90 XW |
2740 | /* |
2741 | * If IORING_SETUP_SQPOLL is enabled, sqes are either handled in sq thread | |
2742 | * task context or in io worker task context. If current task context is | |
2743 | * sq thread, we don't need to check whether should wake up sq thread. | |
2744 | */ | |
2745 | if (in_async && (ctx->flags & IORING_SETUP_SQPOLL) && | |
534ca6d6 JA |
2746 | wq_has_sleeper(&ctx->sq_data->wait)) |
2747 | wake_up(&ctx->sq_data->wait); | |
def596e9 JA |
2748 | } |
2749 | ||
9f13c35b | 2750 | static void __io_state_file_put(struct io_submit_state *state) |
9a56a232 | 2751 | { |
06ef3608 PB |
2752 | if (state->has_refs) |
2753 | fput_many(state->file, state->has_refs); | |
9f13c35b PB |
2754 | state->file = NULL; |
2755 | } | |
2756 | ||
2757 | static inline void io_state_file_put(struct io_submit_state *state) | |
2758 | { | |
2759 | if (state->file) | |
2760 | __io_state_file_put(state); | |
9a56a232 JA |
2761 | } |
2762 | ||
2763 | /* | |
2764 | * Get as many references to a file as we have IOs left in this submission, | |
2765 | * assuming most submissions are for one file, or at least that each file | |
2766 | * has more than one submission. | |
2767 | */ | |
8da11c19 | 2768 | static struct file *__io_file_get(struct io_submit_state *state, int fd) |
9a56a232 JA |
2769 | { |
2770 | if (!state) | |
2771 | return fget(fd); | |
2772 | ||
2773 | if (state->file) { | |
2774 | if (state->fd == fd) { | |
06ef3608 | 2775 | state->has_refs--; |
9a56a232 JA |
2776 | return state->file; |
2777 | } | |
9f13c35b | 2778 | __io_state_file_put(state); |
9a56a232 JA |
2779 | } |
2780 | state->file = fget_many(fd, state->ios_left); | |
2781 | if (!state->file) | |
2782 | return NULL; | |
2783 | ||
2784 | state->fd = fd; | |
71b547c0 | 2785 | state->has_refs = state->ios_left - 1; |
9a56a232 JA |
2786 | return state->file; |
2787 | } | |
2788 | ||
4503b767 JA |
2789 | static bool io_bdev_nowait(struct block_device *bdev) |
2790 | { | |
2791 | #ifdef CONFIG_BLOCK | |
9ba0d0c8 | 2792 | return !bdev || blk_queue_nowait(bdev_get_queue(bdev)); |
4503b767 JA |
2793 | #else |
2794 | return true; | |
2795 | #endif | |
2796 | } | |
2797 | ||
2b188cc1 JA |
2798 | /* |
2799 | * If we tracked the file through the SCM inflight mechanism, we could support | |
2800 | * any file. For now, just ensure that anything potentially problematic is done | |
2801 | * inline. | |
2802 | */ | |
af197f50 | 2803 | static bool io_file_supports_async(struct file *file, int rw) |
2b188cc1 JA |
2804 | { |
2805 | umode_t mode = file_inode(file)->i_mode; | |
2806 | ||
4503b767 JA |
2807 | if (S_ISBLK(mode)) { |
2808 | if (io_bdev_nowait(file->f_inode->i_bdev)) | |
2809 | return true; | |
2810 | return false; | |
2811 | } | |
2812 | if (S_ISCHR(mode) || S_ISSOCK(mode)) | |
2b188cc1 | 2813 | return true; |
4503b767 JA |
2814 | if (S_ISREG(mode)) { |
2815 | if (io_bdev_nowait(file->f_inode->i_sb->s_bdev) && | |
2816 | file->f_op != &io_uring_fops) | |
2817 | return true; | |
2818 | return false; | |
2819 | } | |
2b188cc1 | 2820 | |
c5b85625 JA |
2821 | /* any ->read/write should understand O_NONBLOCK */ |
2822 | if (file->f_flags & O_NONBLOCK) | |
2823 | return true; | |
2824 | ||
af197f50 JA |
2825 | if (!(file->f_mode & FMODE_NOWAIT)) |
2826 | return false; | |
2827 | ||
2828 | if (rw == READ) | |
2829 | return file->f_op->read_iter != NULL; | |
2830 | ||
2831 | return file->f_op->write_iter != NULL; | |
2b188cc1 JA |
2832 | } |
2833 | ||
a88fc400 | 2834 | static int io_prep_rw(struct io_kiocb *req, const struct io_uring_sqe *sqe) |
2b188cc1 | 2835 | { |
def596e9 | 2836 | struct io_ring_ctx *ctx = req->ctx; |
9adbd45d | 2837 | struct kiocb *kiocb = &req->rw.kiocb; |
09bb8394 JA |
2838 | unsigned ioprio; |
2839 | int ret; | |
2b188cc1 | 2840 | |
491381ce JA |
2841 | if (S_ISREG(file_inode(req->file)->i_mode)) |
2842 | req->flags |= REQ_F_ISREG; | |
2843 | ||
2b188cc1 | 2844 | kiocb->ki_pos = READ_ONCE(sqe->off); |
ba04291e JA |
2845 | if (kiocb->ki_pos == -1 && !(req->file->f_mode & FMODE_STREAM)) { |
2846 | req->flags |= REQ_F_CUR_POS; | |
2847 | kiocb->ki_pos = req->file->f_pos; | |
2848 | } | |
2b188cc1 | 2849 | kiocb->ki_hint = ki_hint_validate(file_write_hint(kiocb->ki_filp)); |
3e577dcd PB |
2850 | kiocb->ki_flags = iocb_flags(kiocb->ki_filp); |
2851 | ret = kiocb_set_rw_flags(kiocb, READ_ONCE(sqe->rw_flags)); | |
2852 | if (unlikely(ret)) | |
2853 | return ret; | |
2b188cc1 JA |
2854 | |
2855 | ioprio = READ_ONCE(sqe->ioprio); | |
2856 | if (ioprio) { | |
2857 | ret = ioprio_check_cap(ioprio); | |
2858 | if (ret) | |
09bb8394 | 2859 | return ret; |
2b188cc1 JA |
2860 | |
2861 | kiocb->ki_ioprio = ioprio; | |
2862 | } else | |
2863 | kiocb->ki_ioprio = get_current_ioprio(); | |
2864 | ||
8449eeda | 2865 | /* don't allow async punt if RWF_NOWAIT was requested */ |
c5b85625 | 2866 | if (kiocb->ki_flags & IOCB_NOWAIT) |
8449eeda SB |
2867 | req->flags |= REQ_F_NOWAIT; |
2868 | ||
def596e9 | 2869 | if (ctx->flags & IORING_SETUP_IOPOLL) { |
def596e9 JA |
2870 | if (!(kiocb->ki_flags & IOCB_DIRECT) || |
2871 | !kiocb->ki_filp->f_op->iopoll) | |
09bb8394 | 2872 | return -EOPNOTSUPP; |
2b188cc1 | 2873 | |
def596e9 JA |
2874 | kiocb->ki_flags |= IOCB_HIPRI; |
2875 | kiocb->ki_complete = io_complete_rw_iopoll; | |
65a6543d | 2876 | req->iopoll_completed = 0; |
def596e9 | 2877 | } else { |
09bb8394 JA |
2878 | if (kiocb->ki_flags & IOCB_HIPRI) |
2879 | return -EINVAL; | |
def596e9 JA |
2880 | kiocb->ki_complete = io_complete_rw; |
2881 | } | |
9adbd45d | 2882 | |
3529d8c2 JA |
2883 | req->rw.addr = READ_ONCE(sqe->addr); |
2884 | req->rw.len = READ_ONCE(sqe->len); | |
4f4eeba8 | 2885 | req->buf_index = READ_ONCE(sqe->buf_index); |
2b188cc1 | 2886 | return 0; |
2b188cc1 JA |
2887 | } |
2888 | ||
2889 | static inline void io_rw_done(struct kiocb *kiocb, ssize_t ret) | |
2890 | { | |
2891 | switch (ret) { | |
2892 | case -EIOCBQUEUED: | |
2893 | break; | |
2894 | case -ERESTARTSYS: | |
2895 | case -ERESTARTNOINTR: | |
2896 | case -ERESTARTNOHAND: | |
2897 | case -ERESTART_RESTARTBLOCK: | |
2898 | /* | |
2899 | * We can't just restart the syscall, since previously | |
2900 | * submitted sqes may already be in progress. Just fail this | |
2901 | * IO with EINTR. | |
2902 | */ | |
2903 | ret = -EINTR; | |
df561f66 | 2904 | fallthrough; |
2b188cc1 JA |
2905 | default: |
2906 | kiocb->ki_complete(kiocb, ret, 0); | |
2907 | } | |
2908 | } | |
2909 | ||
a1d7c393 JA |
2910 | static void kiocb_done(struct kiocb *kiocb, ssize_t ret, |
2911 | struct io_comp_state *cs) | |
ba816ad6 | 2912 | { |
ba04291e | 2913 | struct io_kiocb *req = container_of(kiocb, struct io_kiocb, rw.kiocb); |
e8c2bc1f | 2914 | struct io_async_rw *io = req->async_data; |
ba04291e | 2915 | |
227c0c96 | 2916 | /* add previously done IO, if any */ |
e8c2bc1f | 2917 | if (io && io->bytes_done > 0) { |
227c0c96 | 2918 | if (ret < 0) |
e8c2bc1f | 2919 | ret = io->bytes_done; |
227c0c96 | 2920 | else |
e8c2bc1f | 2921 | ret += io->bytes_done; |
227c0c96 JA |
2922 | } |
2923 | ||
ba04291e JA |
2924 | if (req->flags & REQ_F_CUR_POS) |
2925 | req->file->f_pos = kiocb->ki_pos; | |
bcaec089 | 2926 | if (ret >= 0 && kiocb->ki_complete == io_complete_rw) |
a1d7c393 | 2927 | __io_complete_rw(req, ret, 0, cs); |
ba816ad6 JA |
2928 | else |
2929 | io_rw_done(kiocb, ret); | |
2930 | } | |
2931 | ||
9adbd45d | 2932 | static ssize_t io_import_fixed(struct io_kiocb *req, int rw, |
7d009165 | 2933 | struct iov_iter *iter) |
edafccee | 2934 | { |
9adbd45d JA |
2935 | struct io_ring_ctx *ctx = req->ctx; |
2936 | size_t len = req->rw.len; | |
edafccee | 2937 | struct io_mapped_ubuf *imu; |
4be1c615 | 2938 | u16 index, buf_index = req->buf_index; |
edafccee JA |
2939 | size_t offset; |
2940 | u64 buf_addr; | |
2941 | ||
edafccee JA |
2942 | if (unlikely(buf_index >= ctx->nr_user_bufs)) |
2943 | return -EFAULT; | |
edafccee JA |
2944 | index = array_index_nospec(buf_index, ctx->nr_user_bufs); |
2945 | imu = &ctx->user_bufs[index]; | |
9adbd45d | 2946 | buf_addr = req->rw.addr; |
edafccee JA |
2947 | |
2948 | /* overflow */ | |
2949 | if (buf_addr + len < buf_addr) | |
2950 | return -EFAULT; | |
2951 | /* not inside the mapped region */ | |
2952 | if (buf_addr < imu->ubuf || buf_addr + len > imu->ubuf + imu->len) | |
2953 | return -EFAULT; | |
2954 | ||
2955 | /* | |
2956 | * May not be a start of buffer, set size appropriately | |
2957 | * and advance us to the beginning. | |
2958 | */ | |
2959 | offset = buf_addr - imu->ubuf; | |
2960 | iov_iter_bvec(iter, rw, imu->bvec, imu->nr_bvecs, offset + len); | |
bd11b3a3 JA |
2961 | |
2962 | if (offset) { | |
2963 | /* | |
2964 | * Don't use iov_iter_advance() here, as it's really slow for | |
2965 | * using the latter parts of a big fixed buffer - it iterates | |
2966 | * over each segment manually. We can cheat a bit here, because | |
2967 | * we know that: | |
2968 | * | |
2969 | * 1) it's a BVEC iter, we set it up | |
2970 | * 2) all bvecs are PAGE_SIZE in size, except potentially the | |
2971 | * first and last bvec | |
2972 | * | |
2973 | * So just find our index, and adjust the iterator afterwards. | |
2974 | * If the offset is within the first bvec (or the whole first | |
2975 | * bvec, just use iov_iter_advance(). This makes it easier | |
2976 | * since we can just skip the first segment, which may not | |
2977 | * be PAGE_SIZE aligned. | |
2978 | */ | |
2979 | const struct bio_vec *bvec = imu->bvec; | |
2980 | ||
2981 | if (offset <= bvec->bv_len) { | |
2982 | iov_iter_advance(iter, offset); | |
2983 | } else { | |
2984 | unsigned long seg_skip; | |
2985 | ||
2986 | /* skip first vec */ | |
2987 | offset -= bvec->bv_len; | |
2988 | seg_skip = 1 + (offset >> PAGE_SHIFT); | |
2989 | ||
2990 | iter->bvec = bvec + seg_skip; | |
2991 | iter->nr_segs -= seg_skip; | |
99c79f66 | 2992 | iter->count -= bvec->bv_len + offset; |
bd11b3a3 | 2993 | iter->iov_offset = offset & ~PAGE_MASK; |
bd11b3a3 JA |
2994 | } |
2995 | } | |
2996 | ||
5e559561 | 2997 | return len; |
edafccee JA |
2998 | } |
2999 | ||
bcda7baa JA |
3000 | static void io_ring_submit_unlock(struct io_ring_ctx *ctx, bool needs_lock) |
3001 | { | |
3002 | if (needs_lock) | |
3003 | mutex_unlock(&ctx->uring_lock); | |
3004 | } | |
3005 | ||
3006 | static void io_ring_submit_lock(struct io_ring_ctx *ctx, bool needs_lock) | |
3007 | { | |
3008 | /* | |
3009 | * "Normal" inline submissions always hold the uring_lock, since we | |
3010 | * grab it from the system call. Same is true for the SQPOLL offload. | |
3011 | * The only exception is when we've detached the request and issue it | |
3012 | * from an async worker thread, grab the lock for that case. | |
3013 | */ | |
3014 | if (needs_lock) | |
3015 | mutex_lock(&ctx->uring_lock); | |
3016 | } | |
3017 | ||
3018 | static struct io_buffer *io_buffer_select(struct io_kiocb *req, size_t *len, | |
3019 | int bgid, struct io_buffer *kbuf, | |
3020 | bool needs_lock) | |
3021 | { | |
3022 | struct io_buffer *head; | |
3023 | ||
3024 | if (req->flags & REQ_F_BUFFER_SELECTED) | |
3025 | return kbuf; | |
3026 | ||
3027 | io_ring_submit_lock(req->ctx, needs_lock); | |
3028 | ||
3029 | lockdep_assert_held(&req->ctx->uring_lock); | |
3030 | ||
3031 | head = idr_find(&req->ctx->io_buffer_idr, bgid); | |
3032 | if (head) { | |
3033 | if (!list_empty(&head->list)) { | |
3034 | kbuf = list_last_entry(&head->list, struct io_buffer, | |
3035 | list); | |
3036 | list_del(&kbuf->list); | |
3037 | } else { | |
3038 | kbuf = head; | |
3039 | idr_remove(&req->ctx->io_buffer_idr, bgid); | |
3040 | } | |
3041 | if (*len > kbuf->len) | |
3042 | *len = kbuf->len; | |
3043 | } else { | |
3044 | kbuf = ERR_PTR(-ENOBUFS); | |
3045 | } | |
3046 | ||
3047 | io_ring_submit_unlock(req->ctx, needs_lock); | |
3048 | ||
3049 | return kbuf; | |
3050 | } | |
3051 | ||
4d954c25 JA |
3052 | static void __user *io_rw_buffer_select(struct io_kiocb *req, size_t *len, |
3053 | bool needs_lock) | |
3054 | { | |
3055 | struct io_buffer *kbuf; | |
4f4eeba8 | 3056 | u16 bgid; |
4d954c25 JA |
3057 | |
3058 | kbuf = (struct io_buffer *) (unsigned long) req->rw.addr; | |
4f4eeba8 | 3059 | bgid = req->buf_index; |
4d954c25 JA |
3060 | kbuf = io_buffer_select(req, len, bgid, kbuf, needs_lock); |
3061 | if (IS_ERR(kbuf)) | |
3062 | return kbuf; | |
3063 | req->rw.addr = (u64) (unsigned long) kbuf; | |
3064 | req->flags |= REQ_F_BUFFER_SELECTED; | |
3065 | return u64_to_user_ptr(kbuf->addr); | |
3066 | } | |
3067 | ||
3068 | #ifdef CONFIG_COMPAT | |
3069 | static ssize_t io_compat_import(struct io_kiocb *req, struct iovec *iov, | |
3070 | bool needs_lock) | |
3071 | { | |
3072 | struct compat_iovec __user *uiov; | |
3073 | compat_ssize_t clen; | |
3074 | void __user *buf; | |
3075 | ssize_t len; | |
3076 | ||
3077 | uiov = u64_to_user_ptr(req->rw.addr); | |
3078 | if (!access_ok(uiov, sizeof(*uiov))) | |
3079 | return -EFAULT; | |
3080 | if (__get_user(clen, &uiov->iov_len)) | |
3081 | return -EFAULT; | |
3082 | if (clen < 0) | |
3083 | return -EINVAL; | |
3084 | ||
3085 | len = clen; | |
3086 | buf = io_rw_buffer_select(req, &len, needs_lock); | |
3087 | if (IS_ERR(buf)) | |
3088 | return PTR_ERR(buf); | |
3089 | iov[0].iov_base = buf; | |
3090 | iov[0].iov_len = (compat_size_t) len; | |
3091 | return 0; | |
3092 | } | |
3093 | #endif | |
3094 | ||
3095 | static ssize_t __io_iov_buffer_select(struct io_kiocb *req, struct iovec *iov, | |
3096 | bool needs_lock) | |
3097 | { | |
3098 | struct iovec __user *uiov = u64_to_user_ptr(req->rw.addr); | |
3099 | void __user *buf; | |
3100 | ssize_t len; | |
3101 | ||
3102 | if (copy_from_user(iov, uiov, sizeof(*uiov))) | |
3103 | return -EFAULT; | |
3104 | ||
3105 | len = iov[0].iov_len; | |
3106 | if (len < 0) | |
3107 | return -EINVAL; | |
3108 | buf = io_rw_buffer_select(req, &len, needs_lock); | |
3109 | if (IS_ERR(buf)) | |
3110 | return PTR_ERR(buf); | |
3111 | iov[0].iov_base = buf; | |
3112 | iov[0].iov_len = len; | |
3113 | return 0; | |
3114 | } | |
3115 | ||
3116 | static ssize_t io_iov_buffer_select(struct io_kiocb *req, struct iovec *iov, | |
3117 | bool needs_lock) | |
3118 | { | |
dddb3e26 JA |
3119 | if (req->flags & REQ_F_BUFFER_SELECTED) { |
3120 | struct io_buffer *kbuf; | |
3121 | ||
3122 | kbuf = (struct io_buffer *) (unsigned long) req->rw.addr; | |
3123 | iov[0].iov_base = u64_to_user_ptr(kbuf->addr); | |
3124 | iov[0].iov_len = kbuf->len; | |
4d954c25 | 3125 | return 0; |
dddb3e26 | 3126 | } |
4d954c25 JA |
3127 | if (!req->rw.len) |
3128 | return 0; | |
3129 | else if (req->rw.len > 1) | |
3130 | return -EINVAL; | |
3131 | ||
3132 | #ifdef CONFIG_COMPAT | |
3133 | if (req->ctx->compat) | |
3134 | return io_compat_import(req, iov, needs_lock); | |
3135 | #endif | |
3136 | ||
3137 | return __io_iov_buffer_select(req, iov, needs_lock); | |
3138 | } | |
3139 | ||
2846c481 | 3140 | static ssize_t io_import_iovec(int rw, struct io_kiocb *req, |
8452fd0c JA |
3141 | struct iovec **iovec, struct iov_iter *iter, |
3142 | bool needs_lock) | |
2b188cc1 | 3143 | { |
9adbd45d JA |
3144 | void __user *buf = u64_to_user_ptr(req->rw.addr); |
3145 | size_t sqe_len = req->rw.len; | |
4d954c25 | 3146 | ssize_t ret; |
edafccee JA |
3147 | u8 opcode; |
3148 | ||
d625c6ee | 3149 | opcode = req->opcode; |
7d009165 | 3150 | if (opcode == IORING_OP_READ_FIXED || opcode == IORING_OP_WRITE_FIXED) { |
edafccee | 3151 | *iovec = NULL; |
9adbd45d | 3152 | return io_import_fixed(req, rw, iter); |
edafccee | 3153 | } |
2b188cc1 | 3154 | |
bcda7baa | 3155 | /* buffer index only valid with fixed read/write, or buffer select */ |
4f4eeba8 | 3156 | if (req->buf_index && !(req->flags & REQ_F_BUFFER_SELECT)) |
9adbd45d JA |
3157 | return -EINVAL; |
3158 | ||
3a6820f2 | 3159 | if (opcode == IORING_OP_READ || opcode == IORING_OP_WRITE) { |
bcda7baa | 3160 | if (req->flags & REQ_F_BUFFER_SELECT) { |
4d954c25 | 3161 | buf = io_rw_buffer_select(req, &sqe_len, needs_lock); |
867a23ea | 3162 | if (IS_ERR(buf)) |
4d954c25 | 3163 | return PTR_ERR(buf); |
3f9d6441 | 3164 | req->rw.len = sqe_len; |
bcda7baa JA |
3165 | } |
3166 | ||
3a6820f2 JA |
3167 | ret = import_single_range(rw, buf, sqe_len, *iovec, iter); |
3168 | *iovec = NULL; | |
10fc72e4 | 3169 | return ret; |
3a6820f2 JA |
3170 | } |
3171 | ||
4d954c25 JA |
3172 | if (req->flags & REQ_F_BUFFER_SELECT) { |
3173 | ret = io_iov_buffer_select(req, *iovec, needs_lock); | |
3f9d6441 JA |
3174 | if (!ret) { |
3175 | ret = (*iovec)->iov_len; | |
3176 | iov_iter_init(iter, rw, *iovec, 1, ret); | |
3177 | } | |
4d954c25 JA |
3178 | *iovec = NULL; |
3179 | return ret; | |
3180 | } | |
3181 | ||
89cd35c5 CH |
3182 | return __import_iovec(rw, buf, sqe_len, UIO_FASTIOV, iovec, iter, |
3183 | req->ctx->compat); | |
2b188cc1 JA |
3184 | } |
3185 | ||
0fef9483 JA |
3186 | static inline loff_t *io_kiocb_ppos(struct kiocb *kiocb) |
3187 | { | |
5b09e37e | 3188 | return (kiocb->ki_filp->f_mode & FMODE_STREAM) ? NULL : &kiocb->ki_pos; |
0fef9483 JA |
3189 | } |
3190 | ||
31b51510 | 3191 | /* |
32960613 JA |
3192 | * For files that don't have ->read_iter() and ->write_iter(), handle them |
3193 | * by looping over ->read() or ->write() manually. | |
31b51510 | 3194 | */ |
4017eb91 | 3195 | static ssize_t loop_rw_iter(int rw, struct io_kiocb *req, struct iov_iter *iter) |
32960613 | 3196 | { |
4017eb91 JA |
3197 | struct kiocb *kiocb = &req->rw.kiocb; |
3198 | struct file *file = req->file; | |
32960613 JA |
3199 | ssize_t ret = 0; |
3200 | ||
3201 | /* | |
3202 | * Don't support polled IO through this interface, and we can't | |
3203 | * support non-blocking either. For the latter, this just causes | |
3204 | * the kiocb to be handled from an async context. | |
3205 | */ | |
3206 | if (kiocb->ki_flags & IOCB_HIPRI) | |
3207 | return -EOPNOTSUPP; | |
3208 | if (kiocb->ki_flags & IOCB_NOWAIT) | |
3209 | return -EAGAIN; | |
3210 | ||
3211 | while (iov_iter_count(iter)) { | |
311ae9e1 | 3212 | struct iovec iovec; |
32960613 JA |
3213 | ssize_t nr; |
3214 | ||
311ae9e1 PB |
3215 | if (!iov_iter_is_bvec(iter)) { |
3216 | iovec = iov_iter_iovec(iter); | |
3217 | } else { | |
4017eb91 JA |
3218 | iovec.iov_base = u64_to_user_ptr(req->rw.addr); |
3219 | iovec.iov_len = req->rw.len; | |
311ae9e1 PB |
3220 | } |
3221 | ||
32960613 JA |
3222 | if (rw == READ) { |
3223 | nr = file->f_op->read(file, iovec.iov_base, | |
0fef9483 | 3224 | iovec.iov_len, io_kiocb_ppos(kiocb)); |
32960613 JA |
3225 | } else { |
3226 | nr = file->f_op->write(file, iovec.iov_base, | |
0fef9483 | 3227 | iovec.iov_len, io_kiocb_ppos(kiocb)); |
32960613 JA |
3228 | } |
3229 | ||
3230 | if (nr < 0) { | |
3231 | if (!ret) | |
3232 | ret = nr; | |
3233 | break; | |
3234 | } | |
3235 | ret += nr; | |
3236 | if (nr != iovec.iov_len) | |
3237 | break; | |
4017eb91 JA |
3238 | req->rw.len -= nr; |
3239 | req->rw.addr += nr; | |
32960613 JA |
3240 | iov_iter_advance(iter, nr); |
3241 | } | |
3242 | ||
3243 | return ret; | |
3244 | } | |
3245 | ||
ff6165b2 JA |
3246 | static void io_req_map_rw(struct io_kiocb *req, const struct iovec *iovec, |
3247 | const struct iovec *fast_iov, struct iov_iter *iter) | |
f67676d1 | 3248 | { |
e8c2bc1f | 3249 | struct io_async_rw *rw = req->async_data; |
b64e3444 | 3250 | |
ff6165b2 | 3251 | memcpy(&rw->iter, iter, sizeof(*iter)); |
afb87658 | 3252 | rw->free_iovec = iovec; |
227c0c96 | 3253 | rw->bytes_done = 0; |
ff6165b2 JA |
3254 | /* can only be fixed buffers, no need to do anything */ |
3255 | if (iter->type == ITER_BVEC) | |
3256 | return; | |
b64e3444 | 3257 | if (!iovec) { |
ff6165b2 JA |
3258 | unsigned iov_off = 0; |
3259 | ||
3260 | rw->iter.iov = rw->fast_iov; | |
3261 | if (iter->iov != fast_iov) { | |
3262 | iov_off = iter->iov - fast_iov; | |
3263 | rw->iter.iov += iov_off; | |
3264 | } | |
3265 | if (rw->fast_iov != fast_iov) | |
3266 | memcpy(rw->fast_iov + iov_off, fast_iov + iov_off, | |
45097dae | 3267 | sizeof(struct iovec) * iter->nr_segs); |
99bc4c38 PB |
3268 | } else { |
3269 | req->flags |= REQ_F_NEED_CLEANUP; | |
f67676d1 JA |
3270 | } |
3271 | } | |
3272 | ||
e8c2bc1f | 3273 | static inline int __io_alloc_async_data(struct io_kiocb *req) |
3d9932a8 | 3274 | { |
e8c2bc1f JA |
3275 | WARN_ON_ONCE(!io_op_defs[req->opcode].async_size); |
3276 | req->async_data = kmalloc(io_op_defs[req->opcode].async_size, GFP_KERNEL); | |
3277 | return req->async_data == NULL; | |
3d9932a8 XW |
3278 | } |
3279 | ||
e8c2bc1f | 3280 | static int io_alloc_async_data(struct io_kiocb *req) |
f67676d1 | 3281 | { |
e8c2bc1f | 3282 | if (!io_op_defs[req->opcode].needs_async_data) |
d3656344 | 3283 | return 0; |
3d9932a8 | 3284 | |
e8c2bc1f | 3285 | return __io_alloc_async_data(req); |
b7bb4f7d JA |
3286 | } |
3287 | ||
ff6165b2 JA |
3288 | static int io_setup_async_rw(struct io_kiocb *req, const struct iovec *iovec, |
3289 | const struct iovec *fast_iov, | |
227c0c96 | 3290 | struct iov_iter *iter, bool force) |
b7bb4f7d | 3291 | { |
e8c2bc1f | 3292 | if (!force && !io_op_defs[req->opcode].needs_async_data) |
74566df3 | 3293 | return 0; |
e8c2bc1f JA |
3294 | if (!req->async_data) { |
3295 | if (__io_alloc_async_data(req)) | |
5d204bcf | 3296 | return -ENOMEM; |
b7bb4f7d | 3297 | |
ff6165b2 | 3298 | io_req_map_rw(req, iovec, fast_iov, iter); |
5d204bcf | 3299 | } |
b7bb4f7d | 3300 | return 0; |
f67676d1 JA |
3301 | } |
3302 | ||
73debe68 | 3303 | static inline int io_rw_prep_async(struct io_kiocb *req, int rw) |
c3e330a4 | 3304 | { |
e8c2bc1f | 3305 | struct io_async_rw *iorw = req->async_data; |
f4bff104 | 3306 | struct iovec *iov = iorw->fast_iov; |
c3e330a4 PB |
3307 | ssize_t ret; |
3308 | ||
2846c481 | 3309 | ret = io_import_iovec(rw, req, &iov, &iorw->iter, false); |
c3e330a4 PB |
3310 | if (unlikely(ret < 0)) |
3311 | return ret; | |
3312 | ||
ab0b196c PB |
3313 | iorw->bytes_done = 0; |
3314 | iorw->free_iovec = iov; | |
3315 | if (iov) | |
3316 | req->flags |= REQ_F_NEED_CLEANUP; | |
c3e330a4 PB |
3317 | return 0; |
3318 | } | |
3319 | ||
73debe68 | 3320 | static int io_read_prep(struct io_kiocb *req, const struct io_uring_sqe *sqe) |
f67676d1 JA |
3321 | { |
3322 | ssize_t ret; | |
3323 | ||
a88fc400 | 3324 | ret = io_prep_rw(req, sqe); |
3529d8c2 JA |
3325 | if (ret) |
3326 | return ret; | |
f67676d1 | 3327 | |
3529d8c2 JA |
3328 | if (unlikely(!(req->file->f_mode & FMODE_READ))) |
3329 | return -EBADF; | |
f67676d1 | 3330 | |
5f798bea | 3331 | /* either don't need iovec imported or already have it */ |
2d199895 | 3332 | if (!req->async_data) |
3529d8c2 | 3333 | return 0; |
73debe68 | 3334 | return io_rw_prep_async(req, READ); |
f67676d1 JA |
3335 | } |
3336 | ||
c1dd91d1 JA |
3337 | /* |
3338 | * This is our waitqueue callback handler, registered through lock_page_async() | |
3339 | * when we initially tried to do the IO with the iocb armed our waitqueue. | |
3340 | * This gets called when the page is unlocked, and we generally expect that to | |
3341 | * happen when the page IO is completed and the page is now uptodate. This will | |
3342 | * queue a task_work based retry of the operation, attempting to copy the data | |
3343 | * again. If the latter fails because the page was NOT uptodate, then we will | |
3344 | * do a thread based blocking retry of the operation. That's the unexpected | |
3345 | * slow path. | |
3346 | */ | |
bcf5a063 JA |
3347 | static int io_async_buf_func(struct wait_queue_entry *wait, unsigned mode, |
3348 | int sync, void *arg) | |
3349 | { | |
3350 | struct wait_page_queue *wpq; | |
3351 | struct io_kiocb *req = wait->private; | |
bcf5a063 | 3352 | struct wait_page_key *key = arg; |
bcf5a063 JA |
3353 | int ret; |
3354 | ||
3355 | wpq = container_of(wait, struct wait_page_queue, wait); | |
3356 | ||
cdc8fcb4 LT |
3357 | if (!wake_page_match(wpq, key)) |
3358 | return 0; | |
3359 | ||
c8d317aa | 3360 | req->rw.kiocb.ki_flags &= ~IOCB_WAITQ; |
bcf5a063 JA |
3361 | list_del_init(&wait->entry); |
3362 | ||
e7375122 | 3363 | init_task_work(&req->task_work, io_req_task_submit); |
6d816e08 JA |
3364 | percpu_ref_get(&req->ctx->refs); |
3365 | ||
bcf5a063 JA |
3366 | /* submit ref gets dropped, acquire a new one */ |
3367 | refcount_inc(&req->refs); | |
87c4311f | 3368 | ret = io_req_task_work_add(req, true); |
bcf5a063 | 3369 | if (unlikely(ret)) { |
c2c4c83c JA |
3370 | struct task_struct *tsk; |
3371 | ||
bcf5a063 | 3372 | /* queue just for cancelation */ |
e7375122 | 3373 | init_task_work(&req->task_work, io_req_task_cancel); |
bcf5a063 | 3374 | tsk = io_wq_get_task(req->ctx->io_wq); |
91989c70 | 3375 | task_work_add(tsk, &req->task_work, TWA_NONE); |
c2c4c83c | 3376 | wake_up_process(tsk); |
bcf5a063 | 3377 | } |
bcf5a063 JA |
3378 | return 1; |
3379 | } | |
3380 | ||
c1dd91d1 JA |
3381 | /* |
3382 | * This controls whether a given IO request should be armed for async page | |
3383 | * based retry. If we return false here, the request is handed to the async | |
3384 | * worker threads for retry. If we're doing buffered reads on a regular file, | |
3385 | * we prepare a private wait_page_queue entry and retry the operation. This | |
3386 | * will either succeed because the page is now uptodate and unlocked, or it | |
3387 | * will register a callback when the page is unlocked at IO completion. Through | |
3388 | * that callback, io_uring uses task_work to setup a retry of the operation. | |
3389 | * That retry will attempt the buffered read again. The retry will generally | |
3390 | * succeed, or in rare cases where it fails, we then fall back to using the | |
3391 | * async worker threads for a blocking retry. | |
3392 | */ | |
227c0c96 | 3393 | static bool io_rw_should_retry(struct io_kiocb *req) |
f67676d1 | 3394 | { |
e8c2bc1f JA |
3395 | struct io_async_rw *rw = req->async_data; |
3396 | struct wait_page_queue *wait = &rw->wpq; | |
bcf5a063 | 3397 | struct kiocb *kiocb = &req->rw.kiocb; |
f67676d1 | 3398 | |
bcf5a063 JA |
3399 | /* never retry for NOWAIT, we just complete with -EAGAIN */ |
3400 | if (req->flags & REQ_F_NOWAIT) | |
3401 | return false; | |
f67676d1 | 3402 | |
227c0c96 | 3403 | /* Only for buffered IO */ |
3b2a4439 | 3404 | if (kiocb->ki_flags & (IOCB_DIRECT | IOCB_HIPRI)) |
bcf5a063 | 3405 | return false; |
3b2a4439 | 3406 | |
bcf5a063 JA |
3407 | /* |
3408 | * just use poll if we can, and don't attempt if the fs doesn't | |
3409 | * support callback based unlocks | |
3410 | */ | |
3411 | if (file_can_poll(req->file) || !(req->file->f_mode & FMODE_BUF_RASYNC)) | |
3412 | return false; | |
f67676d1 | 3413 | |
3b2a4439 JA |
3414 | wait->wait.func = io_async_buf_func; |
3415 | wait->wait.private = req; | |
3416 | wait->wait.flags = 0; | |
3417 | INIT_LIST_HEAD(&wait->wait.entry); | |
3418 | kiocb->ki_flags |= IOCB_WAITQ; | |
c8d317aa | 3419 | kiocb->ki_flags &= ~IOCB_NOWAIT; |
3b2a4439 | 3420 | kiocb->ki_waitq = wait; |
3b2a4439 | 3421 | return true; |
bcf5a063 JA |
3422 | } |
3423 | ||
3424 | static int io_iter_do_read(struct io_kiocb *req, struct iov_iter *iter) | |
3425 | { | |
3426 | if (req->file->f_op->read_iter) | |
3427 | return call_read_iter(req->file, &req->rw.kiocb, iter); | |
2dd2111d | 3428 | else if (req->file->f_op->read) |
4017eb91 | 3429 | return loop_rw_iter(READ, req, iter); |
2dd2111d GH |
3430 | else |
3431 | return -EINVAL; | |
f67676d1 JA |
3432 | } |
3433 | ||
a1d7c393 JA |
3434 | static int io_read(struct io_kiocb *req, bool force_nonblock, |
3435 | struct io_comp_state *cs) | |
2b188cc1 JA |
3436 | { |
3437 | struct iovec inline_vecs[UIO_FASTIOV], *iovec = inline_vecs; | |
9adbd45d | 3438 | struct kiocb *kiocb = &req->rw.kiocb; |
ff6165b2 | 3439 | struct iov_iter __iter, *iter = &__iter; |
e8c2bc1f | 3440 | struct io_async_rw *rw = req->async_data; |
227c0c96 | 3441 | ssize_t io_size, ret, ret2; |
f5cac8b1 | 3442 | bool no_async; |
ff6165b2 | 3443 | |
2846c481 | 3444 | if (rw) { |
e8c2bc1f | 3445 | iter = &rw->iter; |
2846c481 PB |
3446 | iovec = NULL; |
3447 | } else { | |
3448 | ret = io_import_iovec(READ, req, &iovec, iter, !force_nonblock); | |
3449 | if (ret < 0) | |
3450 | return ret; | |
3451 | } | |
632546c4 | 3452 | io_size = iov_iter_count(iter); |
fa15bafb | 3453 | req->result = io_size; |
227c0c96 | 3454 | ret = 0; |
2b188cc1 | 3455 | |
fd6c2e4c JA |
3456 | /* Ensure we clear previously set non-block flag */ |
3457 | if (!force_nonblock) | |
29de5f6a | 3458 | kiocb->ki_flags &= ~IOCB_NOWAIT; |
a88fc400 PB |
3459 | else |
3460 | kiocb->ki_flags |= IOCB_NOWAIT; | |
3461 | ||
fd6c2e4c | 3462 | |
24c74678 | 3463 | /* If the file doesn't support async, just async punt */ |
f5cac8b1 JA |
3464 | no_async = force_nonblock && !io_file_supports_async(req->file, READ); |
3465 | if (no_async) | |
f67676d1 | 3466 | goto copy_iov; |
9e645e11 | 3467 | |
632546c4 | 3468 | ret = rw_verify_area(READ, req->file, io_kiocb_ppos(kiocb), io_size); |
fa15bafb PB |
3469 | if (unlikely(ret)) |
3470 | goto out_free; | |
2b188cc1 | 3471 | |
227c0c96 | 3472 | ret = io_iter_do_read(req, iter); |
32960613 | 3473 | |
227c0c96 JA |
3474 | if (!ret) { |
3475 | goto done; | |
3476 | } else if (ret == -EIOCBQUEUED) { | |
3477 | ret = 0; | |
3478 | goto out_free; | |
3479 | } else if (ret == -EAGAIN) { | |
eefdf30f JA |
3480 | /* IOPOLL retry should happen for io-wq threads */ |
3481 | if (!force_nonblock && !(req->ctx->flags & IORING_SETUP_IOPOLL)) | |
f91daf56 | 3482 | goto done; |
355afaeb JA |
3483 | /* no retry on NONBLOCK marked file */ |
3484 | if (req->file->f_flags & O_NONBLOCK) | |
3485 | goto done; | |
84216315 | 3486 | /* some cases will consume bytes even on error returns */ |
632546c4 | 3487 | iov_iter_revert(iter, io_size - iov_iter_count(iter)); |
f38c7e3a JA |
3488 | ret = 0; |
3489 | goto copy_iov; | |
227c0c96 | 3490 | } else if (ret < 0) { |
00d23d51 JA |
3491 | /* make sure -ERESTARTSYS -> -EINTR is done */ |
3492 | goto done; | |
227c0c96 JA |
3493 | } |
3494 | ||
3495 | /* read it all, or we did blocking attempt. no retry. */ | |
f91daf56 JA |
3496 | if (!iov_iter_count(iter) || !force_nonblock || |
3497 | (req->file->f_flags & O_NONBLOCK)) | |
227c0c96 JA |
3498 | goto done; |
3499 | ||
3500 | io_size -= ret; | |
3501 | copy_iov: | |
3502 | ret2 = io_setup_async_rw(req, iovec, inline_vecs, iter, true); | |
3503 | if (ret2) { | |
3504 | ret = ret2; | |
3505 | goto out_free; | |
3506 | } | |
f5cac8b1 JA |
3507 | if (no_async) |
3508 | return -EAGAIN; | |
e8c2bc1f | 3509 | rw = req->async_data; |
227c0c96 JA |
3510 | /* it's copied and will be cleaned with ->io */ |
3511 | iovec = NULL; | |
3512 | /* now use our persistent iterator, if we aren't already */ | |
e8c2bc1f | 3513 | iter = &rw->iter; |
227c0c96 | 3514 | retry: |
e8c2bc1f | 3515 | rw->bytes_done += ret; |
227c0c96 JA |
3516 | /* if we can retry, do so with the callbacks armed */ |
3517 | if (!io_rw_should_retry(req)) { | |
fa15bafb PB |
3518 | kiocb->ki_flags &= ~IOCB_WAITQ; |
3519 | return -EAGAIN; | |
2b188cc1 | 3520 | } |
227c0c96 JA |
3521 | |
3522 | /* | |
3523 | * Now retry read with the IOCB_WAITQ parts set in the iocb. If we | |
3524 | * get -EIOCBQUEUED, then we'll get a notification when the desired | |
3525 | * page gets unlocked. We can also get a partial read here, and if we | |
3526 | * do, then just retry at the new offset. | |
3527 | */ | |
3528 | ret = io_iter_do_read(req, iter); | |
3529 | if (ret == -EIOCBQUEUED) { | |
3530 | ret = 0; | |
3531 | goto out_free; | |
3532 | } else if (ret > 0 && ret < io_size) { | |
3533 | /* we got some bytes, but not all. retry. */ | |
3534 | goto retry; | |
3535 | } | |
3536 | done: | |
3537 | kiocb_done(kiocb, ret, cs); | |
3538 | ret = 0; | |
f67676d1 | 3539 | out_free: |
f261c168 | 3540 | /* it's reportedly faster than delegating the null check to kfree() */ |
252917c3 | 3541 | if (iovec) |
6f2cc166 | 3542 | kfree(iovec); |
2b188cc1 JA |
3543 | return ret; |
3544 | } | |
3545 | ||
73debe68 | 3546 | static int io_write_prep(struct io_kiocb *req, const struct io_uring_sqe *sqe) |
f67676d1 JA |
3547 | { |
3548 | ssize_t ret; | |
3549 | ||
a88fc400 | 3550 | ret = io_prep_rw(req, sqe); |
3529d8c2 JA |
3551 | if (ret) |
3552 | return ret; | |
f67676d1 | 3553 | |
3529d8c2 JA |
3554 | if (unlikely(!(req->file->f_mode & FMODE_WRITE))) |
3555 | return -EBADF; | |
f67676d1 | 3556 | |
5f798bea | 3557 | /* either don't need iovec imported or already have it */ |
2d199895 | 3558 | if (!req->async_data) |
3529d8c2 | 3559 | return 0; |
73debe68 | 3560 | return io_rw_prep_async(req, WRITE); |
f67676d1 JA |
3561 | } |
3562 | ||
a1d7c393 JA |
3563 | static int io_write(struct io_kiocb *req, bool force_nonblock, |
3564 | struct io_comp_state *cs) | |
2b188cc1 JA |
3565 | { |
3566 | struct iovec inline_vecs[UIO_FASTIOV], *iovec = inline_vecs; | |
9adbd45d | 3567 | struct kiocb *kiocb = &req->rw.kiocb; |
ff6165b2 | 3568 | struct iov_iter __iter, *iter = &__iter; |
e8c2bc1f | 3569 | struct io_async_rw *rw = req->async_data; |
fa15bafb | 3570 | ssize_t ret, ret2, io_size; |
2b188cc1 | 3571 | |
2846c481 | 3572 | if (rw) { |
e8c2bc1f | 3573 | iter = &rw->iter; |
2846c481 PB |
3574 | iovec = NULL; |
3575 | } else { | |
3576 | ret = io_import_iovec(WRITE, req, &iovec, iter, !force_nonblock); | |
3577 | if (ret < 0) | |
3578 | return ret; | |
3579 | } | |
632546c4 | 3580 | io_size = iov_iter_count(iter); |
fa15bafb | 3581 | req->result = io_size; |
2b188cc1 | 3582 | |
fd6c2e4c JA |
3583 | /* Ensure we clear previously set non-block flag */ |
3584 | if (!force_nonblock) | |
a88fc400 PB |
3585 | kiocb->ki_flags &= ~IOCB_NOWAIT; |
3586 | else | |
3587 | kiocb->ki_flags |= IOCB_NOWAIT; | |
fd6c2e4c | 3588 | |
24c74678 | 3589 | /* If the file doesn't support async, just async punt */ |
af197f50 | 3590 | if (force_nonblock && !io_file_supports_async(req->file, WRITE)) |
f67676d1 | 3591 | goto copy_iov; |
31b51510 | 3592 | |
10d59345 JA |
3593 | /* file path doesn't support NOWAIT for non-direct_IO */ |
3594 | if (force_nonblock && !(kiocb->ki_flags & IOCB_DIRECT) && | |
3595 | (req->flags & REQ_F_ISREG)) | |
f67676d1 | 3596 | goto copy_iov; |
31b51510 | 3597 | |
632546c4 | 3598 | ret = rw_verify_area(WRITE, req->file, io_kiocb_ppos(kiocb), io_size); |
fa15bafb PB |
3599 | if (unlikely(ret)) |
3600 | goto out_free; | |
4ed734b0 | 3601 | |
fa15bafb PB |
3602 | /* |
3603 | * Open-code file_start_write here to grab freeze protection, | |
3604 | * which will be released by another thread in | |
3605 | * io_complete_rw(). Fool lockdep by telling it the lock got | |
3606 | * released so that it doesn't complain about the held lock when | |
3607 | * we return to userspace. | |
3608 | */ | |
3609 | if (req->flags & REQ_F_ISREG) { | |
8a3c84b6 | 3610 | sb_start_write(file_inode(req->file)->i_sb); |
fa15bafb PB |
3611 | __sb_writers_release(file_inode(req->file)->i_sb, |
3612 | SB_FREEZE_WRITE); | |
3613 | } | |
3614 | kiocb->ki_flags |= IOCB_WRITE; | |
4ed734b0 | 3615 | |
fa15bafb | 3616 | if (req->file->f_op->write_iter) |
ff6165b2 | 3617 | ret2 = call_write_iter(req->file, kiocb, iter); |
2dd2111d | 3618 | else if (req->file->f_op->write) |
4017eb91 | 3619 | ret2 = loop_rw_iter(WRITE, req, iter); |
2dd2111d GH |
3620 | else |
3621 | ret2 = -EINVAL; | |
4ed734b0 | 3622 | |
fa15bafb PB |
3623 | /* |
3624 | * Raw bdev writes will return -EOPNOTSUPP for IOCB_NOWAIT. Just | |
3625 | * retry them without IOCB_NOWAIT. | |
3626 | */ | |
3627 | if (ret2 == -EOPNOTSUPP && (kiocb->ki_flags & IOCB_NOWAIT)) | |
3628 | ret2 = -EAGAIN; | |
355afaeb JA |
3629 | /* no retry on NONBLOCK marked file */ |
3630 | if (ret2 == -EAGAIN && (req->file->f_flags & O_NONBLOCK)) | |
3631 | goto done; | |
fa15bafb | 3632 | if (!force_nonblock || ret2 != -EAGAIN) { |
eefdf30f JA |
3633 | /* IOPOLL retry should happen for io-wq threads */ |
3634 | if ((req->ctx->flags & IORING_SETUP_IOPOLL) && ret2 == -EAGAIN) | |
3635 | goto copy_iov; | |
355afaeb | 3636 | done: |
fa15bafb PB |
3637 | kiocb_done(kiocb, ret2, cs); |
3638 | } else { | |
f67676d1 | 3639 | copy_iov: |
84216315 | 3640 | /* some cases will consume bytes even on error returns */ |
632546c4 | 3641 | iov_iter_revert(iter, io_size - iov_iter_count(iter)); |
227c0c96 | 3642 | ret = io_setup_async_rw(req, iovec, inline_vecs, iter, false); |
ff6165b2 JA |
3643 | if (!ret) |
3644 | return -EAGAIN; | |
2b188cc1 | 3645 | } |
31b51510 | 3646 | out_free: |
f261c168 | 3647 | /* it's reportedly faster than delegating the null check to kfree() */ |
252917c3 | 3648 | if (iovec) |
6f2cc166 | 3649 | kfree(iovec); |
2b188cc1 JA |
3650 | return ret; |
3651 | } | |
3652 | ||
80a261fd JA |
3653 | static int io_renameat_prep(struct io_kiocb *req, |
3654 | const struct io_uring_sqe *sqe) | |
3655 | { | |
3656 | struct io_rename *ren = &req->rename; | |
3657 | const char __user *oldf, *newf; | |
3658 | ||
3659 | if (unlikely(req->flags & REQ_F_FIXED_FILE)) | |
3660 | return -EBADF; | |
3661 | ||
3662 | ren->old_dfd = READ_ONCE(sqe->fd); | |
3663 | oldf = u64_to_user_ptr(READ_ONCE(sqe->addr)); | |
3664 | newf = u64_to_user_ptr(READ_ONCE(sqe->addr2)); | |
3665 | ren->new_dfd = READ_ONCE(sqe->len); | |
3666 | ren->flags = READ_ONCE(sqe->rename_flags); | |
3667 | ||
3668 | ren->oldpath = getname(oldf); | |
3669 | if (IS_ERR(ren->oldpath)) | |
3670 | return PTR_ERR(ren->oldpath); | |
3671 | ||
3672 | ren->newpath = getname(newf); | |
3673 | if (IS_ERR(ren->newpath)) { | |
3674 | putname(ren->oldpath); | |
3675 | return PTR_ERR(ren->newpath); | |
3676 | } | |
3677 | ||
3678 | req->flags |= REQ_F_NEED_CLEANUP; | |
3679 | return 0; | |
3680 | } | |
3681 | ||
3682 | static int io_renameat(struct io_kiocb *req, bool force_nonblock) | |
3683 | { | |
3684 | struct io_rename *ren = &req->rename; | |
3685 | int ret; | |
3686 | ||
3687 | if (force_nonblock) | |
3688 | return -EAGAIN; | |
3689 | ||
3690 | ret = do_renameat2(ren->old_dfd, ren->oldpath, ren->new_dfd, | |
3691 | ren->newpath, ren->flags); | |
3692 | ||
3693 | req->flags &= ~REQ_F_NEED_CLEANUP; | |
3694 | if (ret < 0) | |
3695 | req_set_fail_links(req); | |
3696 | io_req_complete(req, ret); | |
3697 | return 0; | |
3698 | } | |
3699 | ||
14a1143b JA |
3700 | static int io_unlinkat_prep(struct io_kiocb *req, |
3701 | const struct io_uring_sqe *sqe) | |
3702 | { | |
3703 | struct io_unlink *un = &req->unlink; | |
3704 | const char __user *fname; | |
3705 | ||
3706 | if (unlikely(req->flags & REQ_F_FIXED_FILE)) | |
3707 | return -EBADF; | |
3708 | ||
3709 | un->dfd = READ_ONCE(sqe->fd); | |
3710 | ||
3711 | un->flags = READ_ONCE(sqe->unlink_flags); | |
3712 | if (un->flags & ~AT_REMOVEDIR) | |
3713 | return -EINVAL; | |
3714 | ||
3715 | fname = u64_to_user_ptr(READ_ONCE(sqe->addr)); | |
3716 | un->filename = getname(fname); | |
3717 | if (IS_ERR(un->filename)) | |
3718 | return PTR_ERR(un->filename); | |
3719 | ||
3720 | req->flags |= REQ_F_NEED_CLEANUP; | |
3721 | return 0; | |
3722 | } | |
3723 | ||
3724 | static int io_unlinkat(struct io_kiocb *req, bool force_nonblock) | |
3725 | { | |
3726 | struct io_unlink *un = &req->unlink; | |
3727 | int ret; | |
3728 | ||
3729 | if (force_nonblock) | |
3730 | return -EAGAIN; | |
3731 | ||
3732 | if (un->flags & AT_REMOVEDIR) | |
3733 | ret = do_rmdir(un->dfd, un->filename); | |
3734 | else | |
3735 | ret = do_unlinkat(un->dfd, un->filename); | |
3736 | ||
3737 | req->flags &= ~REQ_F_NEED_CLEANUP; | |
3738 | if (ret < 0) | |
3739 | req_set_fail_links(req); | |
3740 | io_req_complete(req, ret); | |
3741 | return 0; | |
3742 | } | |
3743 | ||
36f4fa68 JA |
3744 | static int io_shutdown_prep(struct io_kiocb *req, |
3745 | const struct io_uring_sqe *sqe) | |
3746 | { | |
3747 | #if defined(CONFIG_NET) | |
3748 | if (unlikely(req->ctx->flags & IORING_SETUP_IOPOLL)) | |
3749 | return -EINVAL; | |
3750 | if (sqe->ioprio || sqe->off || sqe->addr || sqe->rw_flags || | |
3751 | sqe->buf_index) | |
3752 | return -EINVAL; | |
3753 | ||
3754 | req->shutdown.how = READ_ONCE(sqe->len); | |
3755 | return 0; | |
3756 | #else | |
3757 | return -EOPNOTSUPP; | |
3758 | #endif | |
3759 | } | |
3760 | ||
3761 | static int io_shutdown(struct io_kiocb *req, bool force_nonblock) | |
3762 | { | |
3763 | #if defined(CONFIG_NET) | |
3764 | struct socket *sock; | |
3765 | int ret; | |
3766 | ||
3767 | if (force_nonblock) | |
3768 | return -EAGAIN; | |
3769 | ||
3770 | sock = sock_from_file(req->file, &ret); | |
3771 | if (unlikely(!sock)) | |
3772 | return ret; | |
3773 | ||
3774 | ret = __sys_shutdown_sock(sock, req->shutdown.how); | |
3775 | io_req_complete(req, ret); | |
3776 | return 0; | |
3777 | #else | |
3778 | return -EOPNOTSUPP; | |
3779 | #endif | |
3780 | } | |
3781 | ||
f2a8d5c7 PB |
3782 | static int __io_splice_prep(struct io_kiocb *req, |
3783 | const struct io_uring_sqe *sqe) | |
7d67af2c PB |
3784 | { |
3785 | struct io_splice* sp = &req->splice; | |
3786 | unsigned int valid_flags = SPLICE_F_FD_IN_FIXED | SPLICE_F_ALL; | |
7d67af2c | 3787 | |
3232dd02 PB |
3788 | if (unlikely(req->ctx->flags & IORING_SETUP_IOPOLL)) |
3789 | return -EINVAL; | |
7d67af2c PB |
3790 | |
3791 | sp->file_in = NULL; | |
7d67af2c PB |
3792 | sp->len = READ_ONCE(sqe->len); |
3793 | sp->flags = READ_ONCE(sqe->splice_flags); | |
3794 | ||
3795 | if (unlikely(sp->flags & ~valid_flags)) | |
3796 | return -EINVAL; | |
3797 | ||
8371adf5 PB |
3798 | sp->file_in = io_file_get(NULL, req, READ_ONCE(sqe->splice_fd_in), |
3799 | (sp->flags & SPLICE_F_FD_IN_FIXED)); | |
3800 | if (!sp->file_in) | |
3801 | return -EBADF; | |
7d67af2c PB |
3802 | req->flags |= REQ_F_NEED_CLEANUP; |
3803 | ||
7cdaf587 XW |
3804 | if (!S_ISREG(file_inode(sp->file_in)->i_mode)) { |
3805 | /* | |
3806 | * Splice operation will be punted aync, and here need to | |
3807 | * modify io_wq_work.flags, so initialize io_wq_work firstly. | |
3808 | */ | |
3809 | io_req_init_async(req); | |
7d67af2c | 3810 | req->work.flags |= IO_WQ_WORK_UNBOUND; |
7cdaf587 | 3811 | } |
7d67af2c PB |
3812 | |
3813 | return 0; | |
3814 | } | |
3815 | ||
f2a8d5c7 PB |
3816 | static int io_tee_prep(struct io_kiocb *req, |
3817 | const struct io_uring_sqe *sqe) | |
3818 | { | |
3819 | if (READ_ONCE(sqe->splice_off_in) || READ_ONCE(sqe->off)) | |
3820 | return -EINVAL; | |
3821 | return __io_splice_prep(req, sqe); | |
3822 | } | |
3823 | ||
3824 | static int io_tee(struct io_kiocb *req, bool force_nonblock) | |
3825 | { | |
3826 | struct io_splice *sp = &req->splice; | |
3827 | struct file *in = sp->file_in; | |
3828 | struct file *out = sp->file_out; | |
3829 | unsigned int flags = sp->flags & ~SPLICE_F_FD_IN_FIXED; | |
3830 | long ret = 0; | |
3831 | ||
3832 | if (force_nonblock) | |
3833 | return -EAGAIN; | |
3834 | if (sp->len) | |
3835 | ret = do_tee(in, out, sp->len, flags); | |
3836 | ||
3837 | io_put_file(req, in, (sp->flags & SPLICE_F_FD_IN_FIXED)); | |
3838 | req->flags &= ~REQ_F_NEED_CLEANUP; | |
3839 | ||
f2a8d5c7 PB |
3840 | if (ret != sp->len) |
3841 | req_set_fail_links(req); | |
e1e16097 | 3842 | io_req_complete(req, ret); |
f2a8d5c7 PB |
3843 | return 0; |
3844 | } | |
3845 | ||
3846 | static int io_splice_prep(struct io_kiocb *req, const struct io_uring_sqe *sqe) | |
3847 | { | |
3848 | struct io_splice* sp = &req->splice; | |
3849 | ||
3850 | sp->off_in = READ_ONCE(sqe->splice_off_in); | |
3851 | sp->off_out = READ_ONCE(sqe->off); | |
3852 | return __io_splice_prep(req, sqe); | |
3853 | } | |
3854 | ||
014db007 | 3855 | static int io_splice(struct io_kiocb *req, bool force_nonblock) |
7d67af2c PB |
3856 | { |
3857 | struct io_splice *sp = &req->splice; | |
3858 | struct file *in = sp->file_in; | |
3859 | struct file *out = sp->file_out; | |
3860 | unsigned int flags = sp->flags & ~SPLICE_F_FD_IN_FIXED; | |
3861 | loff_t *poff_in, *poff_out; | |
c9687426 | 3862 | long ret = 0; |
7d67af2c | 3863 | |
2fb3e822 PB |
3864 | if (force_nonblock) |
3865 | return -EAGAIN; | |
7d67af2c PB |
3866 | |
3867 | poff_in = (sp->off_in == -1) ? NULL : &sp->off_in; | |
3868 | poff_out = (sp->off_out == -1) ? NULL : &sp->off_out; | |
c9687426 | 3869 | |
948a7749 | 3870 | if (sp->len) |
c9687426 | 3871 | ret = do_splice(in, poff_in, out, poff_out, sp->len, flags); |
7d67af2c PB |
3872 | |
3873 | io_put_file(req, in, (sp->flags & SPLICE_F_FD_IN_FIXED)); | |
3874 | req->flags &= ~REQ_F_NEED_CLEANUP; | |
3875 | ||
7d67af2c PB |
3876 | if (ret != sp->len) |
3877 | req_set_fail_links(req); | |
e1e16097 | 3878 | io_req_complete(req, ret); |
7d67af2c PB |
3879 | return 0; |
3880 | } | |
3881 | ||
2b188cc1 JA |
3882 | /* |
3883 | * IORING_OP_NOP just posts a completion event, nothing else. | |
3884 | */ | |
229a7b63 | 3885 | static int io_nop(struct io_kiocb *req, struct io_comp_state *cs) |
2b188cc1 JA |
3886 | { |
3887 | struct io_ring_ctx *ctx = req->ctx; | |
2b188cc1 | 3888 | |
def596e9 JA |
3889 | if (unlikely(ctx->flags & IORING_SETUP_IOPOLL)) |
3890 | return -EINVAL; | |
3891 | ||
229a7b63 | 3892 | __io_req_complete(req, 0, 0, cs); |
2b188cc1 JA |
3893 | return 0; |
3894 | } | |
3895 | ||
3529d8c2 | 3896 | static int io_prep_fsync(struct io_kiocb *req, const struct io_uring_sqe *sqe) |
c992fe29 | 3897 | { |
6b06314c | 3898 | struct io_ring_ctx *ctx = req->ctx; |
c992fe29 | 3899 | |
09bb8394 JA |
3900 | if (!req->file) |
3901 | return -EBADF; | |
c992fe29 | 3902 | |
6b06314c | 3903 | if (unlikely(ctx->flags & IORING_SETUP_IOPOLL)) |
def596e9 | 3904 | return -EINVAL; |
edafccee | 3905 | if (unlikely(sqe->addr || sqe->ioprio || sqe->buf_index)) |
c992fe29 CH |
3906 | return -EINVAL; |
3907 | ||
8ed8d3c3 JA |
3908 | req->sync.flags = READ_ONCE(sqe->fsync_flags); |
3909 | if (unlikely(req->sync.flags & ~IORING_FSYNC_DATASYNC)) | |
3910 | return -EINVAL; | |
3911 | ||
3912 | req->sync.off = READ_ONCE(sqe->off); | |
3913 | req->sync.len = READ_ONCE(sqe->len); | |
c992fe29 CH |
3914 | return 0; |
3915 | } | |
3916 | ||
ac45abc0 | 3917 | static int io_fsync(struct io_kiocb *req, bool force_nonblock) |
8ed8d3c3 | 3918 | { |
8ed8d3c3 | 3919 | loff_t end = req->sync.off + req->sync.len; |
8ed8d3c3 JA |
3920 | int ret; |
3921 | ||
ac45abc0 PB |
3922 | /* fsync always requires a blocking context */ |
3923 | if (force_nonblock) | |
3924 | return -EAGAIN; | |
3925 | ||
9adbd45d | 3926 | ret = vfs_fsync_range(req->file, req->sync.off, |
8ed8d3c3 JA |
3927 | end > 0 ? end : LLONG_MAX, |
3928 | req->sync.flags & IORING_FSYNC_DATASYNC); | |
3929 | if (ret < 0) | |
3930 | req_set_fail_links(req); | |
e1e16097 | 3931 | io_req_complete(req, ret); |
c992fe29 CH |
3932 | return 0; |
3933 | } | |
3934 | ||
d63d1b5e JA |
3935 | static int io_fallocate_prep(struct io_kiocb *req, |
3936 | const struct io_uring_sqe *sqe) | |
3937 | { | |
3938 | if (sqe->ioprio || sqe->buf_index || sqe->rw_flags) | |
3939 | return -EINVAL; | |
3232dd02 PB |
3940 | if (unlikely(req->ctx->flags & IORING_SETUP_IOPOLL)) |
3941 | return -EINVAL; | |
d63d1b5e JA |
3942 | |
3943 | req->sync.off = READ_ONCE(sqe->off); | |
3944 | req->sync.len = READ_ONCE(sqe->addr); | |
3945 | req->sync.mode = READ_ONCE(sqe->len); | |
3946 | return 0; | |
3947 | } | |
3948 | ||
014db007 | 3949 | static int io_fallocate(struct io_kiocb *req, bool force_nonblock) |
5d17b4a4 | 3950 | { |
ac45abc0 PB |
3951 | int ret; |
3952 | ||
d63d1b5e | 3953 | /* fallocate always requiring blocking context */ |
ac45abc0 | 3954 | if (force_nonblock) |
5d17b4a4 | 3955 | return -EAGAIN; |
ac45abc0 PB |
3956 | ret = vfs_fallocate(req->file, req->sync.mode, req->sync.off, |
3957 | req->sync.len); | |
ac45abc0 PB |
3958 | if (ret < 0) |
3959 | req_set_fail_links(req); | |
e1e16097 | 3960 | io_req_complete(req, ret); |
5d17b4a4 JA |
3961 | return 0; |
3962 | } | |
3963 | ||
ec65fea5 | 3964 | static int __io_openat_prep(struct io_kiocb *req, const struct io_uring_sqe *sqe) |
b7bb4f7d | 3965 | { |
f8748881 | 3966 | const char __user *fname; |
15b71abe | 3967 | int ret; |
b7bb4f7d | 3968 | |
ec65fea5 | 3969 | if (unlikely(sqe->ioprio || sqe->buf_index)) |
15b71abe | 3970 | return -EINVAL; |
ec65fea5 | 3971 | if (unlikely(req->flags & REQ_F_FIXED_FILE)) |
cf3040ca | 3972 | return -EBADF; |
03b1230c | 3973 | |
ec65fea5 PB |
3974 | /* open.how should be already initialised */ |
3975 | if (!(req->open.how.flags & O_PATH) && force_o_largefile()) | |
08a1d26e | 3976 | req->open.how.flags |= O_LARGEFILE; |
3529d8c2 | 3977 | |
25e72d10 PB |
3978 | req->open.dfd = READ_ONCE(sqe->fd); |
3979 | fname = u64_to_user_ptr(READ_ONCE(sqe->addr)); | |
f8748881 | 3980 | req->open.filename = getname(fname); |
15b71abe JA |
3981 | if (IS_ERR(req->open.filename)) { |
3982 | ret = PTR_ERR(req->open.filename); | |
3983 | req->open.filename = NULL; | |
3984 | return ret; | |
3985 | } | |
4022e7af | 3986 | req->open.nofile = rlimit(RLIMIT_NOFILE); |
944d1444 | 3987 | req->open.ignore_nonblock = false; |
8fef80bf | 3988 | req->flags |= REQ_F_NEED_CLEANUP; |
15b71abe | 3989 | return 0; |
03b1230c JA |
3990 | } |
3991 | ||
ec65fea5 PB |
3992 | static int io_openat_prep(struct io_kiocb *req, const struct io_uring_sqe *sqe) |
3993 | { | |
3994 | u64 flags, mode; | |
3995 | ||
14587a46 | 3996 | if (unlikely(req->ctx->flags & IORING_SETUP_IOPOLL)) |
4eb8dded | 3997 | return -EINVAL; |
ec65fea5 PB |
3998 | mode = READ_ONCE(sqe->len); |
3999 | flags = READ_ONCE(sqe->open_flags); | |
4000 | req->open.how = build_open_how(flags, mode); | |
4001 | return __io_openat_prep(req, sqe); | |
4002 | } | |
4003 | ||
cebdb986 | 4004 | static int io_openat2_prep(struct io_kiocb *req, const struct io_uring_sqe *sqe) |
aa1fa28f | 4005 | { |
cebdb986 | 4006 | struct open_how __user *how; |
cebdb986 | 4007 | size_t len; |
0fa03c62 JA |
4008 | int ret; |
4009 | ||
14587a46 | 4010 | if (unlikely(req->ctx->flags & IORING_SETUP_IOPOLL)) |
4eb8dded | 4011 | return -EINVAL; |
cebdb986 JA |
4012 | how = u64_to_user_ptr(READ_ONCE(sqe->addr2)); |
4013 | len = READ_ONCE(sqe->len); | |
cebdb986 JA |
4014 | if (len < OPEN_HOW_SIZE_VER0) |
4015 | return -EINVAL; | |
3529d8c2 | 4016 | |
cebdb986 JA |
4017 | ret = copy_struct_from_user(&req->open.how, sizeof(req->open.how), how, |
4018 | len); | |
4019 | if (ret) | |
4020 | return ret; | |
3529d8c2 | 4021 | |
ec65fea5 | 4022 | return __io_openat_prep(req, sqe); |
cebdb986 JA |
4023 | } |
4024 | ||
014db007 | 4025 | static int io_openat2(struct io_kiocb *req, bool force_nonblock) |
15b71abe JA |
4026 | { |
4027 | struct open_flags op; | |
15b71abe JA |
4028 | struct file *file; |
4029 | int ret; | |
4030 | ||
944d1444 | 4031 | if (force_nonblock && !req->open.ignore_nonblock) |
15b71abe | 4032 | return -EAGAIN; |
15b71abe | 4033 | |
cebdb986 | 4034 | ret = build_open_flags(&req->open.how, &op); |
15b71abe JA |
4035 | if (ret) |
4036 | goto err; | |
4037 | ||
4022e7af | 4038 | ret = __get_unused_fd_flags(req->open.how.flags, req->open.nofile); |
15b71abe JA |
4039 | if (ret < 0) |
4040 | goto err; | |
4041 | ||
4042 | file = do_filp_open(req->open.dfd, req->open.filename, &op); | |
4043 | if (IS_ERR(file)) { | |
4044 | put_unused_fd(ret); | |
4045 | ret = PTR_ERR(file); | |
944d1444 JA |
4046 | /* |
4047 | * A work-around to ensure that /proc/self works that way | |
4048 | * that it should - if we get -EOPNOTSUPP back, then assume | |
4049 | * that proc_self_get_link() failed us because we're in async | |
4050 | * context. We should be safe to retry this from the task | |
4051 | * itself with force_nonblock == false set, as it should not | |
4052 | * block on lookup. Would be nice to know this upfront and | |
4053 | * avoid the async dance, but doesn't seem feasible. | |
4054 | */ | |
4055 | if (ret == -EOPNOTSUPP && io_wq_current_is_worker()) { | |
4056 | req->open.ignore_nonblock = true; | |
4057 | refcount_inc(&req->refs); | |
4058 | io_req_task_queue(req); | |
4059 | return 0; | |
4060 | } | |
15b71abe JA |
4061 | } else { |
4062 | fsnotify_open(file); | |
4063 | fd_install(ret, file); | |
4064 | } | |
4065 | err: | |
4066 | putname(req->open.filename); | |
8fef80bf | 4067 | req->flags &= ~REQ_F_NEED_CLEANUP; |
15b71abe JA |
4068 | if (ret < 0) |
4069 | req_set_fail_links(req); | |
e1e16097 | 4070 | io_req_complete(req, ret); |
15b71abe JA |
4071 | return 0; |
4072 | } | |
4073 | ||
014db007 | 4074 | static int io_openat(struct io_kiocb *req, bool force_nonblock) |
cebdb986 | 4075 | { |
014db007 | 4076 | return io_openat2(req, force_nonblock); |
cebdb986 JA |
4077 | } |
4078 | ||
067524e9 JA |
4079 | static int io_remove_buffers_prep(struct io_kiocb *req, |
4080 | const struct io_uring_sqe *sqe) | |
4081 | { | |
4082 | struct io_provide_buf *p = &req->pbuf; | |
4083 | u64 tmp; | |
4084 | ||
4085 | if (sqe->ioprio || sqe->rw_flags || sqe->addr || sqe->len || sqe->off) | |
4086 | return -EINVAL; | |
4087 | ||
4088 | tmp = READ_ONCE(sqe->fd); | |
4089 | if (!tmp || tmp > USHRT_MAX) | |
4090 | return -EINVAL; | |
4091 | ||
4092 | memset(p, 0, sizeof(*p)); | |
4093 | p->nbufs = tmp; | |
4094 | p->bgid = READ_ONCE(sqe->buf_group); | |
4095 | return 0; | |
4096 | } | |
4097 | ||
4098 | static int __io_remove_buffers(struct io_ring_ctx *ctx, struct io_buffer *buf, | |
4099 | int bgid, unsigned nbufs) | |
4100 | { | |
4101 | unsigned i = 0; | |
4102 | ||
4103 | /* shouldn't happen */ | |
4104 | if (!nbufs) | |
4105 | return 0; | |
4106 | ||
4107 | /* the head kbuf is the list itself */ | |
4108 | while (!list_empty(&buf->list)) { | |
4109 | struct io_buffer *nxt; | |
4110 | ||
4111 | nxt = list_first_entry(&buf->list, struct io_buffer, list); | |
4112 | list_del(&nxt->list); | |
4113 | kfree(nxt); | |
4114 | if (++i == nbufs) | |
4115 | return i; | |
4116 | } | |
4117 | i++; | |
4118 | kfree(buf); | |
4119 | idr_remove(&ctx->io_buffer_idr, bgid); | |
4120 | ||
4121 | return i; | |
4122 | } | |
4123 | ||
229a7b63 JA |
4124 | static int io_remove_buffers(struct io_kiocb *req, bool force_nonblock, |
4125 | struct io_comp_state *cs) | |
067524e9 JA |
4126 | { |
4127 | struct io_provide_buf *p = &req->pbuf; | |
4128 | struct io_ring_ctx *ctx = req->ctx; | |
4129 | struct io_buffer *head; | |
4130 | int ret = 0; | |
4131 | ||
4132 | io_ring_submit_lock(ctx, !force_nonblock); | |
4133 | ||
4134 | lockdep_assert_held(&ctx->uring_lock); | |
4135 | ||
4136 | ret = -ENOENT; | |
4137 | head = idr_find(&ctx->io_buffer_idr, p->bgid); | |
4138 | if (head) | |
4139 | ret = __io_remove_buffers(ctx, head, p->bgid, p->nbufs); | |
4140 | ||
4141 | io_ring_submit_lock(ctx, !force_nonblock); | |
4142 | if (ret < 0) | |
4143 | req_set_fail_links(req); | |
229a7b63 | 4144 | __io_req_complete(req, ret, 0, cs); |
067524e9 JA |
4145 | return 0; |
4146 | } | |
4147 | ||
ddf0322d JA |
4148 | static int io_provide_buffers_prep(struct io_kiocb *req, |
4149 | const struct io_uring_sqe *sqe) | |
4150 | { | |
4151 | struct io_provide_buf *p = &req->pbuf; | |
4152 | u64 tmp; | |
4153 | ||
4154 | if (sqe->ioprio || sqe->rw_flags) | |
4155 | return -EINVAL; | |
4156 | ||
4157 | tmp = READ_ONCE(sqe->fd); | |
4158 | if (!tmp || tmp > USHRT_MAX) | |
4159 | return -E2BIG; | |
4160 | p->nbufs = tmp; | |
4161 | p->addr = READ_ONCE(sqe->addr); | |
4162 | p->len = READ_ONCE(sqe->len); | |
4163 | ||
efe68c1c | 4164 | if (!access_ok(u64_to_user_ptr(p->addr), (p->len * p->nbufs))) |
ddf0322d JA |
4165 | return -EFAULT; |
4166 | ||
4167 | p->bgid = READ_ONCE(sqe->buf_group); | |
4168 | tmp = READ_ONCE(sqe->off); | |
4169 | if (tmp > USHRT_MAX) | |
4170 | return -E2BIG; | |
4171 | p->bid = tmp; | |
4172 | return 0; | |
4173 | } | |
4174 | ||
4175 | static int io_add_buffers(struct io_provide_buf *pbuf, struct io_buffer **head) | |
4176 | { | |
4177 | struct io_buffer *buf; | |
4178 | u64 addr = pbuf->addr; | |
4179 | int i, bid = pbuf->bid; | |
4180 | ||
4181 | for (i = 0; i < pbuf->nbufs; i++) { | |
4182 | buf = kmalloc(sizeof(*buf), GFP_KERNEL); | |
4183 | if (!buf) | |
4184 | break; | |
4185 | ||
4186 | buf->addr = addr; | |
4187 | buf->len = pbuf->len; | |
4188 | buf->bid = bid; | |
4189 | addr += pbuf->len; | |
4190 | bid++; | |
4191 | if (!*head) { | |
4192 | INIT_LIST_HEAD(&buf->list); | |
4193 | *head = buf; | |
4194 | } else { | |
4195 | list_add_tail(&buf->list, &(*head)->list); | |
4196 | } | |
4197 | } | |
4198 | ||
4199 | return i ? i : -ENOMEM; | |
4200 | } | |
4201 | ||
229a7b63 JA |
4202 | static int io_provide_buffers(struct io_kiocb *req, bool force_nonblock, |
4203 | struct io_comp_state *cs) | |
ddf0322d JA |
4204 | { |
4205 | struct io_provide_buf *p = &req->pbuf; | |
4206 | struct io_ring_ctx *ctx = req->ctx; | |
4207 | struct io_buffer *head, *list; | |
4208 | int ret = 0; | |
4209 | ||
4210 | io_ring_submit_lock(ctx, !force_nonblock); | |
4211 | ||
4212 | lockdep_assert_held(&ctx->uring_lock); | |
4213 | ||
4214 | list = head = idr_find(&ctx->io_buffer_idr, p->bgid); | |
4215 | ||
4216 | ret = io_add_buffers(p, &head); | |
4217 | if (ret < 0) | |
4218 | goto out; | |
4219 | ||
4220 | if (!list) { | |
4221 | ret = idr_alloc(&ctx->io_buffer_idr, head, p->bgid, p->bgid + 1, | |
4222 | GFP_KERNEL); | |
4223 | if (ret < 0) { | |
067524e9 | 4224 | __io_remove_buffers(ctx, head, p->bgid, -1U); |
ddf0322d JA |
4225 | goto out; |
4226 | } | |
4227 | } | |
4228 | out: | |
4229 | io_ring_submit_unlock(ctx, !force_nonblock); | |
4230 | if (ret < 0) | |
4231 | req_set_fail_links(req); | |
229a7b63 | 4232 | __io_req_complete(req, ret, 0, cs); |
ddf0322d | 4233 | return 0; |
cebdb986 JA |
4234 | } |
4235 | ||
3e4827b0 JA |
4236 | static int io_epoll_ctl_prep(struct io_kiocb *req, |
4237 | const struct io_uring_sqe *sqe) | |
4238 | { | |
4239 | #if defined(CONFIG_EPOLL) | |
4240 | if (sqe->ioprio || sqe->buf_index) | |
4241 | return -EINVAL; | |
6ca56f84 | 4242 | if (unlikely(req->ctx->flags & (IORING_SETUP_IOPOLL | IORING_SETUP_SQPOLL))) |
3232dd02 | 4243 | return -EINVAL; |
3e4827b0 JA |
4244 | |
4245 | req->epoll.epfd = READ_ONCE(sqe->fd); | |
4246 | req->epoll.op = READ_ONCE(sqe->len); | |
4247 | req->epoll.fd = READ_ONCE(sqe->off); | |
4248 | ||
4249 | if (ep_op_has_event(req->epoll.op)) { | |
4250 | struct epoll_event __user *ev; | |
4251 | ||
4252 | ev = u64_to_user_ptr(READ_ONCE(sqe->addr)); | |
4253 | if (copy_from_user(&req->epoll.event, ev, sizeof(*ev))) | |
4254 | return -EFAULT; | |
4255 | } | |
4256 | ||
4257 | return 0; | |
4258 | #else | |
4259 | return -EOPNOTSUPP; | |
4260 | #endif | |
4261 | } | |
4262 | ||
229a7b63 JA |
4263 | static int io_epoll_ctl(struct io_kiocb *req, bool force_nonblock, |
4264 | struct io_comp_state *cs) | |
3e4827b0 JA |
4265 | { |
4266 | #if defined(CONFIG_EPOLL) | |
4267 | struct io_epoll *ie = &req->epoll; | |
4268 | int ret; | |
4269 | ||
4270 | ret = do_epoll_ctl(ie->epfd, ie->op, ie->fd, &ie->event, force_nonblock); | |
4271 | if (force_nonblock && ret == -EAGAIN) | |
4272 | return -EAGAIN; | |
4273 | ||
4274 | if (ret < 0) | |
4275 | req_set_fail_links(req); | |
229a7b63 | 4276 | __io_req_complete(req, ret, 0, cs); |
3e4827b0 JA |
4277 | return 0; |
4278 | #else | |
4279 | return -EOPNOTSUPP; | |
4280 | #endif | |
4281 | } | |
4282 | ||
c1ca757b JA |
4283 | static int io_madvise_prep(struct io_kiocb *req, const struct io_uring_sqe *sqe) |
4284 | { | |
4285 | #if defined(CONFIG_ADVISE_SYSCALLS) && defined(CONFIG_MMU) | |
4286 | if (sqe->ioprio || sqe->buf_index || sqe->off) | |
4287 | return -EINVAL; | |
3232dd02 PB |
4288 | if (unlikely(req->ctx->flags & IORING_SETUP_IOPOLL)) |
4289 | return -EINVAL; | |
c1ca757b JA |
4290 | |
4291 | req->madvise.addr = READ_ONCE(sqe->addr); | |
4292 | req->madvise.len = READ_ONCE(sqe->len); | |
4293 | req->madvise.advice = READ_ONCE(sqe->fadvise_advice); | |
4294 | return 0; | |
4295 | #else | |
4296 | return -EOPNOTSUPP; | |
4297 | #endif | |
4298 | } | |
4299 | ||
014db007 | 4300 | static int io_madvise(struct io_kiocb *req, bool force_nonblock) |
c1ca757b JA |
4301 | { |
4302 | #if defined(CONFIG_ADVISE_SYSCALLS) && defined(CONFIG_MMU) | |
4303 | struct io_madvise *ma = &req->madvise; | |
4304 | int ret; | |
4305 | ||
4306 | if (force_nonblock) | |
4307 | return -EAGAIN; | |
4308 | ||
0726b01e | 4309 | ret = do_madvise(current->mm, ma->addr, ma->len, ma->advice); |
c1ca757b JA |
4310 | if (ret < 0) |
4311 | req_set_fail_links(req); | |
e1e16097 | 4312 | io_req_complete(req, ret); |
c1ca757b JA |
4313 | return 0; |
4314 | #else | |
4315 | return -EOPNOTSUPP; | |
4316 | #endif | |
4317 | } | |
4318 | ||
4840e418 JA |
4319 | static int io_fadvise_prep(struct io_kiocb *req, const struct io_uring_sqe *sqe) |
4320 | { | |
4321 | if (sqe->ioprio || sqe->buf_index || sqe->addr) | |
4322 | return -EINVAL; | |
3232dd02 PB |
4323 | if (unlikely(req->ctx->flags & IORING_SETUP_IOPOLL)) |
4324 | return -EINVAL; | |
4840e418 JA |
4325 | |
4326 | req->fadvise.offset = READ_ONCE(sqe->off); | |
4327 | req->fadvise.len = READ_ONCE(sqe->len); | |
4328 | req->fadvise.advice = READ_ONCE(sqe->fadvise_advice); | |
4329 | return 0; | |
4330 | } | |
4331 | ||
014db007 | 4332 | static int io_fadvise(struct io_kiocb *req, bool force_nonblock) |
4840e418 JA |
4333 | { |
4334 | struct io_fadvise *fa = &req->fadvise; | |
4335 | int ret; | |
4336 | ||
3e69426d JA |
4337 | if (force_nonblock) { |
4338 | switch (fa->advice) { | |
4339 | case POSIX_FADV_NORMAL: | |
4340 | case POSIX_FADV_RANDOM: | |
4341 | case POSIX_FADV_SEQUENTIAL: | |
4342 | break; | |
4343 | default: | |
4344 | return -EAGAIN; | |
4345 | } | |
4346 | } | |
4840e418 JA |
4347 | |
4348 | ret = vfs_fadvise(req->file, fa->offset, fa->len, fa->advice); | |
4349 | if (ret < 0) | |
4350 | req_set_fail_links(req); | |
e1e16097 | 4351 | io_req_complete(req, ret); |
4840e418 JA |
4352 | return 0; |
4353 | } | |
4354 | ||
eddc7ef5 JA |
4355 | static int io_statx_prep(struct io_kiocb *req, const struct io_uring_sqe *sqe) |
4356 | { | |
6ca56f84 | 4357 | if (unlikely(req->ctx->flags & (IORING_SETUP_IOPOLL | IORING_SETUP_SQPOLL))) |
3232dd02 | 4358 | return -EINVAL; |
eddc7ef5 JA |
4359 | if (sqe->ioprio || sqe->buf_index) |
4360 | return -EINVAL; | |
9c280f90 | 4361 | if (req->flags & REQ_F_FIXED_FILE) |
cf3040ca | 4362 | return -EBADF; |
eddc7ef5 | 4363 | |
1d9e1288 BM |
4364 | req->statx.dfd = READ_ONCE(sqe->fd); |
4365 | req->statx.mask = READ_ONCE(sqe->len); | |
e62753e4 | 4366 | req->statx.filename = u64_to_user_ptr(READ_ONCE(sqe->addr)); |
1d9e1288 BM |
4367 | req->statx.buffer = u64_to_user_ptr(READ_ONCE(sqe->addr2)); |
4368 | req->statx.flags = READ_ONCE(sqe->statx_flags); | |
eddc7ef5 JA |
4369 | |
4370 | return 0; | |
4371 | } | |
4372 | ||
014db007 | 4373 | static int io_statx(struct io_kiocb *req, bool force_nonblock) |
eddc7ef5 | 4374 | { |
1d9e1288 | 4375 | struct io_statx *ctx = &req->statx; |
eddc7ef5 JA |
4376 | int ret; |
4377 | ||
5b0bbee4 JA |
4378 | if (force_nonblock) { |
4379 | /* only need file table for an actual valid fd */ | |
4380 | if (ctx->dfd == -1 || ctx->dfd == AT_FDCWD) | |
4381 | req->flags |= REQ_F_NO_FILE_TABLE; | |
eddc7ef5 | 4382 | return -EAGAIN; |
5b0bbee4 | 4383 | } |
eddc7ef5 | 4384 | |
e62753e4 BM |
4385 | ret = do_statx(ctx->dfd, ctx->filename, ctx->flags, ctx->mask, |
4386 | ctx->buffer); | |
eddc7ef5 | 4387 | |
eddc7ef5 JA |
4388 | if (ret < 0) |
4389 | req_set_fail_links(req); | |
e1e16097 | 4390 | io_req_complete(req, ret); |
eddc7ef5 JA |
4391 | return 0; |
4392 | } | |
4393 | ||
b5dba59e JA |
4394 | static int io_close_prep(struct io_kiocb *req, const struct io_uring_sqe *sqe) |
4395 | { | |
4396 | /* | |
4397 | * If we queue this for async, it must not be cancellable. That would | |
7cdaf587 XW |
4398 | * leave the 'file' in an undeterminate state, and here need to modify |
4399 | * io_wq_work.flags, so initialize io_wq_work firstly. | |
b5dba59e | 4400 | */ |
7cdaf587 | 4401 | io_req_init_async(req); |
b5dba59e JA |
4402 | req->work.flags |= IO_WQ_WORK_NO_CANCEL; |
4403 | ||
14587a46 | 4404 | if (unlikely(req->ctx->flags & IORING_SETUP_IOPOLL)) |
3232dd02 | 4405 | return -EINVAL; |
b5dba59e JA |
4406 | if (sqe->ioprio || sqe->off || sqe->addr || sqe->len || |
4407 | sqe->rw_flags || sqe->buf_index) | |
4408 | return -EINVAL; | |
9c280f90 | 4409 | if (req->flags & REQ_F_FIXED_FILE) |
cf3040ca | 4410 | return -EBADF; |
b5dba59e JA |
4411 | |
4412 | req->close.fd = READ_ONCE(sqe->fd); | |
0f212204 | 4413 | if ((req->file && req->file->f_op == &io_uring_fops)) |
fd2206e4 | 4414 | return -EBADF; |
b5dba59e | 4415 | |
3af73b28 | 4416 | req->close.put_file = NULL; |
b5dba59e | 4417 | return 0; |
b5dba59e JA |
4418 | } |
4419 | ||
229a7b63 JA |
4420 | static int io_close(struct io_kiocb *req, bool force_nonblock, |
4421 | struct io_comp_state *cs) | |
b5dba59e | 4422 | { |
3af73b28 | 4423 | struct io_close *close = &req->close; |
b5dba59e JA |
4424 | int ret; |
4425 | ||
3af73b28 PB |
4426 | /* might be already done during nonblock submission */ |
4427 | if (!close->put_file) { | |
4428 | ret = __close_fd_get_file(close->fd, &close->put_file); | |
4429 | if (ret < 0) | |
4430 | return (ret == -ENOENT) ? -EBADF : ret; | |
4431 | } | |
b5dba59e JA |
4432 | |
4433 | /* if the file has a flush method, be safe and punt to async */ | |
3af73b28 | 4434 | if (close->put_file->f_op->flush && force_nonblock) { |
24c74678 PB |
4435 | /* was never set, but play safe */ |
4436 | req->flags &= ~REQ_F_NOWAIT; | |
0bf0eefd | 4437 | /* avoid grabbing files - we don't need the files */ |
24c74678 | 4438 | req->flags |= REQ_F_NO_FILE_TABLE; |
0bf0eefd | 4439 | return -EAGAIN; |
a2100672 | 4440 | } |
b5dba59e | 4441 | |
3af73b28 | 4442 | /* No ->flush() or already async, safely close from here */ |
98447d65 | 4443 | ret = filp_close(close->put_file, req->work.identity->files); |
3af73b28 PB |
4444 | if (ret < 0) |
4445 | req_set_fail_links(req); | |
3af73b28 PB |
4446 | fput(close->put_file); |
4447 | close->put_file = NULL; | |
229a7b63 | 4448 | __io_req_complete(req, ret, 0, cs); |
1a417f4e | 4449 | return 0; |
b5dba59e JA |
4450 | } |
4451 | ||
3529d8c2 | 4452 | static int io_prep_sfr(struct io_kiocb *req, const struct io_uring_sqe *sqe) |
5d17b4a4 JA |
4453 | { |
4454 | struct io_ring_ctx *ctx = req->ctx; | |
5d17b4a4 JA |
4455 | |
4456 | if (!req->file) | |
4457 | return -EBADF; | |
5d17b4a4 JA |
4458 | |
4459 | if (unlikely(ctx->flags & IORING_SETUP_IOPOLL)) | |
4460 | return -EINVAL; | |
4461 | if (unlikely(sqe->addr || sqe->ioprio || sqe->buf_index)) | |
4462 | return -EINVAL; | |
4463 | ||
8ed8d3c3 JA |
4464 | req->sync.off = READ_ONCE(sqe->off); |
4465 | req->sync.len = READ_ONCE(sqe->len); | |
4466 | req->sync.flags = READ_ONCE(sqe->sync_range_flags); | |
8ed8d3c3 JA |
4467 | return 0; |
4468 | } | |
4469 | ||
ac45abc0 | 4470 | static int io_sync_file_range(struct io_kiocb *req, bool force_nonblock) |
8ed8d3c3 | 4471 | { |
8ed8d3c3 JA |
4472 | int ret; |
4473 | ||
ac45abc0 PB |
4474 | /* sync_file_range always requires a blocking context */ |
4475 | if (force_nonblock) | |
4476 | return -EAGAIN; | |
4477 | ||
9adbd45d | 4478 | ret = sync_file_range(req->file, req->sync.off, req->sync.len, |
8ed8d3c3 JA |
4479 | req->sync.flags); |
4480 | if (ret < 0) | |
4481 | req_set_fail_links(req); | |
e1e16097 | 4482 | io_req_complete(req, ret); |
5d17b4a4 JA |
4483 | return 0; |
4484 | } | |
4485 | ||
469956e8 | 4486 | #if defined(CONFIG_NET) |
02d27d89 PB |
4487 | static int io_setup_async_msg(struct io_kiocb *req, |
4488 | struct io_async_msghdr *kmsg) | |
4489 | { | |
e8c2bc1f JA |
4490 | struct io_async_msghdr *async_msg = req->async_data; |
4491 | ||
4492 | if (async_msg) | |
02d27d89 | 4493 | return -EAGAIN; |
e8c2bc1f | 4494 | if (io_alloc_async_data(req)) { |
02d27d89 PB |
4495 | if (kmsg->iov != kmsg->fast_iov) |
4496 | kfree(kmsg->iov); | |
4497 | return -ENOMEM; | |
4498 | } | |
e8c2bc1f | 4499 | async_msg = req->async_data; |
02d27d89 | 4500 | req->flags |= REQ_F_NEED_CLEANUP; |
e8c2bc1f | 4501 | memcpy(async_msg, kmsg, sizeof(*kmsg)); |
02d27d89 PB |
4502 | return -EAGAIN; |
4503 | } | |
4504 | ||
2ae523ed PB |
4505 | static int io_sendmsg_copy_hdr(struct io_kiocb *req, |
4506 | struct io_async_msghdr *iomsg) | |
4507 | { | |
4508 | iomsg->iov = iomsg->fast_iov; | |
4509 | iomsg->msg.msg_name = &iomsg->addr; | |
4510 | return sendmsg_copy_msghdr(&iomsg->msg, req->sr_msg.umsg, | |
4511 | req->sr_msg.msg_flags, &iomsg->iov); | |
4512 | } | |
4513 | ||
3529d8c2 | 4514 | static int io_sendmsg_prep(struct io_kiocb *req, const struct io_uring_sqe *sqe) |
03b1230c | 4515 | { |
e8c2bc1f | 4516 | struct io_async_msghdr *async_msg = req->async_data; |
e47293fd | 4517 | struct io_sr_msg *sr = &req->sr_msg; |
99bc4c38 | 4518 | int ret; |
03b1230c | 4519 | |
d2b6f48b PB |
4520 | if (unlikely(req->ctx->flags & IORING_SETUP_IOPOLL)) |
4521 | return -EINVAL; | |
4522 | ||
e47293fd | 4523 | sr->msg_flags = READ_ONCE(sqe->msg_flags); |
270a5940 | 4524 | sr->umsg = u64_to_user_ptr(READ_ONCE(sqe->addr)); |
fddaface | 4525 | sr->len = READ_ONCE(sqe->len); |
3529d8c2 | 4526 | |
d8768362 JA |
4527 | #ifdef CONFIG_COMPAT |
4528 | if (req->ctx->compat) | |
4529 | sr->msg_flags |= MSG_CMSG_COMPAT; | |
4530 | #endif | |
4531 | ||
e8c2bc1f | 4532 | if (!async_msg || !io_op_defs[req->opcode].needs_async_data) |
3529d8c2 | 4533 | return 0; |
e8c2bc1f | 4534 | ret = io_sendmsg_copy_hdr(req, async_msg); |
99bc4c38 PB |
4535 | if (!ret) |
4536 | req->flags |= REQ_F_NEED_CLEANUP; | |
4537 | return ret; | |
03b1230c JA |
4538 | } |
4539 | ||
229a7b63 JA |
4540 | static int io_sendmsg(struct io_kiocb *req, bool force_nonblock, |
4541 | struct io_comp_state *cs) | |
aa1fa28f | 4542 | { |
6b754c8b | 4543 | struct io_async_msghdr iomsg, *kmsg; |
0fa03c62 | 4544 | struct socket *sock; |
7a7cacba | 4545 | unsigned flags; |
0fa03c62 JA |
4546 | int ret; |
4547 | ||
0fa03c62 | 4548 | sock = sock_from_file(req->file, &ret); |
7a7cacba PB |
4549 | if (unlikely(!sock)) |
4550 | return ret; | |
3529d8c2 | 4551 | |
e8c2bc1f JA |
4552 | if (req->async_data) { |
4553 | kmsg = req->async_data; | |
4554 | kmsg->msg.msg_name = &kmsg->addr; | |
7a7cacba PB |
4555 | /* if iov is set, it's allocated already */ |
4556 | if (!kmsg->iov) | |
4557 | kmsg->iov = kmsg->fast_iov; | |
4558 | kmsg->msg.msg_iter.iov = kmsg->iov; | |
4559 | } else { | |
4560 | ret = io_sendmsg_copy_hdr(req, &iomsg); | |
4561 | if (ret) | |
4562 | return ret; | |
4563 | kmsg = &iomsg; | |
0fa03c62 | 4564 | } |
0fa03c62 | 4565 | |
7a7cacba PB |
4566 | flags = req->sr_msg.msg_flags; |
4567 | if (flags & MSG_DONTWAIT) | |
4568 | req->flags |= REQ_F_NOWAIT; | |
4569 | else if (force_nonblock) | |
4570 | flags |= MSG_DONTWAIT; | |
e47293fd | 4571 | |
7a7cacba PB |
4572 | ret = __sys_sendmsg_sock(sock, &kmsg->msg, flags); |
4573 | if (force_nonblock && ret == -EAGAIN) | |
4574 | return io_setup_async_msg(req, kmsg); | |
4575 | if (ret == -ERESTARTSYS) | |
4576 | ret = -EINTR; | |
0fa03c62 | 4577 | |
6b754c8b | 4578 | if (kmsg->iov != kmsg->fast_iov) |
0b416c3e | 4579 | kfree(kmsg->iov); |
99bc4c38 | 4580 | req->flags &= ~REQ_F_NEED_CLEANUP; |
4e88d6e7 JA |
4581 | if (ret < 0) |
4582 | req_set_fail_links(req); | |
229a7b63 | 4583 | __io_req_complete(req, ret, 0, cs); |
5d17b4a4 | 4584 | return 0; |
03b1230c | 4585 | } |
aa1fa28f | 4586 | |
229a7b63 JA |
4587 | static int io_send(struct io_kiocb *req, bool force_nonblock, |
4588 | struct io_comp_state *cs) | |
fddaface | 4589 | { |
7a7cacba PB |
4590 | struct io_sr_msg *sr = &req->sr_msg; |
4591 | struct msghdr msg; | |
4592 | struct iovec iov; | |
fddaface | 4593 | struct socket *sock; |
7a7cacba | 4594 | unsigned flags; |
fddaface JA |
4595 | int ret; |
4596 | ||
fddaface | 4597 | sock = sock_from_file(req->file, &ret); |
7a7cacba PB |
4598 | if (unlikely(!sock)) |
4599 | return ret; | |
fddaface | 4600 | |
7a7cacba PB |
4601 | ret = import_single_range(WRITE, sr->buf, sr->len, &iov, &msg.msg_iter); |
4602 | if (unlikely(ret)) | |
14db8411 | 4603 | return ret; |
fddaface | 4604 | |
7a7cacba PB |
4605 | msg.msg_name = NULL; |
4606 | msg.msg_control = NULL; | |
4607 | msg.msg_controllen = 0; | |
4608 | msg.msg_namelen = 0; | |
fddaface | 4609 | |
7a7cacba PB |
4610 | flags = req->sr_msg.msg_flags; |
4611 | if (flags & MSG_DONTWAIT) | |
4612 | req->flags |= REQ_F_NOWAIT; | |
4613 | else if (force_nonblock) | |
4614 | flags |= MSG_DONTWAIT; | |
fddaface | 4615 | |
7a7cacba PB |
4616 | msg.msg_flags = flags; |
4617 | ret = sock_sendmsg(sock, &msg); | |
4618 | if (force_nonblock && ret == -EAGAIN) | |
4619 | return -EAGAIN; | |
4620 | if (ret == -ERESTARTSYS) | |
4621 | ret = -EINTR; | |
fddaface | 4622 | |
fddaface JA |
4623 | if (ret < 0) |
4624 | req_set_fail_links(req); | |
229a7b63 | 4625 | __io_req_complete(req, ret, 0, cs); |
fddaface | 4626 | return 0; |
fddaface JA |
4627 | } |
4628 | ||
1400e697 PB |
4629 | static int __io_recvmsg_copy_hdr(struct io_kiocb *req, |
4630 | struct io_async_msghdr *iomsg) | |
52de1fe1 JA |
4631 | { |
4632 | struct io_sr_msg *sr = &req->sr_msg; | |
4633 | struct iovec __user *uiov; | |
4634 | size_t iov_len; | |
4635 | int ret; | |
4636 | ||
1400e697 PB |
4637 | ret = __copy_msghdr_from_user(&iomsg->msg, sr->umsg, |
4638 | &iomsg->uaddr, &uiov, &iov_len); | |
52de1fe1 JA |
4639 | if (ret) |
4640 | return ret; | |
4641 | ||
4642 | if (req->flags & REQ_F_BUFFER_SELECT) { | |
4643 | if (iov_len > 1) | |
4644 | return -EINVAL; | |
1400e697 | 4645 | if (copy_from_user(iomsg->iov, uiov, sizeof(*uiov))) |
52de1fe1 | 4646 | return -EFAULT; |
1400e697 PB |
4647 | sr->len = iomsg->iov[0].iov_len; |
4648 | iov_iter_init(&iomsg->msg.msg_iter, READ, iomsg->iov, 1, | |
52de1fe1 | 4649 | sr->len); |
1400e697 | 4650 | iomsg->iov = NULL; |
52de1fe1 | 4651 | } else { |
89cd35c5 CH |
4652 | ret = __import_iovec(READ, uiov, iov_len, UIO_FASTIOV, |
4653 | &iomsg->iov, &iomsg->msg.msg_iter, | |
4654 | false); | |
52de1fe1 JA |
4655 | if (ret > 0) |
4656 | ret = 0; | |
4657 | } | |
4658 | ||
4659 | return ret; | |
4660 | } | |
4661 | ||
4662 | #ifdef CONFIG_COMPAT | |
4663 | static int __io_compat_recvmsg_copy_hdr(struct io_kiocb *req, | |
1400e697 | 4664 | struct io_async_msghdr *iomsg) |
52de1fe1 JA |
4665 | { |
4666 | struct compat_msghdr __user *msg_compat; | |
4667 | struct io_sr_msg *sr = &req->sr_msg; | |
4668 | struct compat_iovec __user *uiov; | |
4669 | compat_uptr_t ptr; | |
4670 | compat_size_t len; | |
4671 | int ret; | |
4672 | ||
270a5940 | 4673 | msg_compat = (struct compat_msghdr __user *) sr->umsg; |
1400e697 | 4674 | ret = __get_compat_msghdr(&iomsg->msg, msg_compat, &iomsg->uaddr, |
52de1fe1 JA |
4675 | &ptr, &len); |
4676 | if (ret) | |
4677 | return ret; | |
4678 | ||
4679 | uiov = compat_ptr(ptr); | |
4680 | if (req->flags & REQ_F_BUFFER_SELECT) { | |
4681 | compat_ssize_t clen; | |
4682 | ||
4683 | if (len > 1) | |
4684 | return -EINVAL; | |
4685 | if (!access_ok(uiov, sizeof(*uiov))) | |
4686 | return -EFAULT; | |
4687 | if (__get_user(clen, &uiov->iov_len)) | |
4688 | return -EFAULT; | |
4689 | if (clen < 0) | |
4690 | return -EINVAL; | |
1400e697 PB |
4691 | sr->len = iomsg->iov[0].iov_len; |
4692 | iomsg->iov = NULL; | |
52de1fe1 | 4693 | } else { |
89cd35c5 CH |
4694 | ret = __import_iovec(READ, (struct iovec __user *)uiov, len, |
4695 | UIO_FASTIOV, &iomsg->iov, | |
4696 | &iomsg->msg.msg_iter, true); | |
52de1fe1 JA |
4697 | if (ret < 0) |
4698 | return ret; | |
4699 | } | |
4700 | ||
4701 | return 0; | |
4702 | } | |
4703 | #endif | |
4704 | ||
1400e697 PB |
4705 | static int io_recvmsg_copy_hdr(struct io_kiocb *req, |
4706 | struct io_async_msghdr *iomsg) | |
52de1fe1 | 4707 | { |
1400e697 PB |
4708 | iomsg->msg.msg_name = &iomsg->addr; |
4709 | iomsg->iov = iomsg->fast_iov; | |
52de1fe1 JA |
4710 | |
4711 | #ifdef CONFIG_COMPAT | |
4712 | if (req->ctx->compat) | |
1400e697 | 4713 | return __io_compat_recvmsg_copy_hdr(req, iomsg); |
fddaface | 4714 | #endif |
52de1fe1 | 4715 | |
1400e697 | 4716 | return __io_recvmsg_copy_hdr(req, iomsg); |
52de1fe1 JA |
4717 | } |
4718 | ||
bcda7baa | 4719 | static struct io_buffer *io_recv_buffer_select(struct io_kiocb *req, |
7fbb1b54 | 4720 | bool needs_lock) |
bcda7baa JA |
4721 | { |
4722 | struct io_sr_msg *sr = &req->sr_msg; | |
4723 | struct io_buffer *kbuf; | |
4724 | ||
bcda7baa JA |
4725 | kbuf = io_buffer_select(req, &sr->len, sr->bgid, sr->kbuf, needs_lock); |
4726 | if (IS_ERR(kbuf)) | |
4727 | return kbuf; | |
4728 | ||
4729 | sr->kbuf = kbuf; | |
4730 | req->flags |= REQ_F_BUFFER_SELECTED; | |
bcda7baa | 4731 | return kbuf; |
fddaface JA |
4732 | } |
4733 | ||
7fbb1b54 PB |
4734 | static inline unsigned int io_put_recv_kbuf(struct io_kiocb *req) |
4735 | { | |
4736 | return io_put_kbuf(req, req->sr_msg.kbuf); | |
4737 | } | |
4738 | ||
3529d8c2 JA |
4739 | static int io_recvmsg_prep(struct io_kiocb *req, |
4740 | const struct io_uring_sqe *sqe) | |
aa1fa28f | 4741 | { |
e8c2bc1f | 4742 | struct io_async_msghdr *async_msg = req->async_data; |
e47293fd | 4743 | struct io_sr_msg *sr = &req->sr_msg; |
99bc4c38 | 4744 | int ret; |
3529d8c2 | 4745 | |
d2b6f48b PB |
4746 | if (unlikely(req->ctx->flags & IORING_SETUP_IOPOLL)) |
4747 | return -EINVAL; | |
4748 | ||
3529d8c2 | 4749 | sr->msg_flags = READ_ONCE(sqe->msg_flags); |
270a5940 | 4750 | sr->umsg = u64_to_user_ptr(READ_ONCE(sqe->addr)); |
0b7b21e4 | 4751 | sr->len = READ_ONCE(sqe->len); |
bcda7baa | 4752 | sr->bgid = READ_ONCE(sqe->buf_group); |
06b76d44 | 4753 | |
d8768362 JA |
4754 | #ifdef CONFIG_COMPAT |
4755 | if (req->ctx->compat) | |
4756 | sr->msg_flags |= MSG_CMSG_COMPAT; | |
4757 | #endif | |
4758 | ||
e8c2bc1f | 4759 | if (!async_msg || !io_op_defs[req->opcode].needs_async_data) |
5f798bea | 4760 | return 0; |
e8c2bc1f | 4761 | ret = io_recvmsg_copy_hdr(req, async_msg); |
99bc4c38 PB |
4762 | if (!ret) |
4763 | req->flags |= REQ_F_NEED_CLEANUP; | |
4764 | return ret; | |
aa1fa28f JA |
4765 | } |
4766 | ||
229a7b63 JA |
4767 | static int io_recvmsg(struct io_kiocb *req, bool force_nonblock, |
4768 | struct io_comp_state *cs) | |
aa1fa28f | 4769 | { |
6b754c8b | 4770 | struct io_async_msghdr iomsg, *kmsg; |
03b1230c | 4771 | struct socket *sock; |
7fbb1b54 | 4772 | struct io_buffer *kbuf; |
7a7cacba | 4773 | unsigned flags; |
52de1fe1 | 4774 | int ret, cflags = 0; |
03b1230c | 4775 | |
03b1230c | 4776 | sock = sock_from_file(req->file, &ret); |
7a7cacba PB |
4777 | if (unlikely(!sock)) |
4778 | return ret; | |
3529d8c2 | 4779 | |
e8c2bc1f JA |
4780 | if (req->async_data) { |
4781 | kmsg = req->async_data; | |
4782 | kmsg->msg.msg_name = &kmsg->addr; | |
7a7cacba PB |
4783 | /* if iov is set, it's allocated already */ |
4784 | if (!kmsg->iov) | |
4785 | kmsg->iov = kmsg->fast_iov; | |
4786 | kmsg->msg.msg_iter.iov = kmsg->iov; | |
4787 | } else { | |
4788 | ret = io_recvmsg_copy_hdr(req, &iomsg); | |
4789 | if (ret) | |
681fda8d | 4790 | return ret; |
7a7cacba PB |
4791 | kmsg = &iomsg; |
4792 | } | |
03b1230c | 4793 | |
bc02ef33 | 4794 | if (req->flags & REQ_F_BUFFER_SELECT) { |
7fbb1b54 | 4795 | kbuf = io_recv_buffer_select(req, !force_nonblock); |
bc02ef33 | 4796 | if (IS_ERR(kbuf)) |
52de1fe1 | 4797 | return PTR_ERR(kbuf); |
7a7cacba PB |
4798 | kmsg->fast_iov[0].iov_base = u64_to_user_ptr(kbuf->addr); |
4799 | iov_iter_init(&kmsg->msg.msg_iter, READ, kmsg->iov, | |
4800 | 1, req->sr_msg.len); | |
4801 | } | |
52de1fe1 | 4802 | |
7a7cacba PB |
4803 | flags = req->sr_msg.msg_flags; |
4804 | if (flags & MSG_DONTWAIT) | |
4805 | req->flags |= REQ_F_NOWAIT; | |
4806 | else if (force_nonblock) | |
4807 | flags |= MSG_DONTWAIT; | |
e47293fd | 4808 | |
7a7cacba PB |
4809 | ret = __sys_recvmsg_sock(sock, &kmsg->msg, req->sr_msg.umsg, |
4810 | kmsg->uaddr, flags); | |
0e1b6fe3 PB |
4811 | if (force_nonblock && ret == -EAGAIN) |
4812 | return io_setup_async_msg(req, kmsg); | |
7a7cacba PB |
4813 | if (ret == -ERESTARTSYS) |
4814 | ret = -EINTR; | |
03b1230c | 4815 | |
7fbb1b54 PB |
4816 | if (req->flags & REQ_F_BUFFER_SELECTED) |
4817 | cflags = io_put_recv_kbuf(req); | |
6b754c8b | 4818 | if (kmsg->iov != kmsg->fast_iov) |
0b416c3e | 4819 | kfree(kmsg->iov); |
99bc4c38 | 4820 | req->flags &= ~REQ_F_NEED_CLEANUP; |
4e88d6e7 JA |
4821 | if (ret < 0) |
4822 | req_set_fail_links(req); | |
229a7b63 | 4823 | __io_req_complete(req, ret, cflags, cs); |
03b1230c | 4824 | return 0; |
0fa03c62 | 4825 | } |
5d17b4a4 | 4826 | |
229a7b63 JA |
4827 | static int io_recv(struct io_kiocb *req, bool force_nonblock, |
4828 | struct io_comp_state *cs) | |
fddaface | 4829 | { |
6b754c8b | 4830 | struct io_buffer *kbuf; |
7a7cacba PB |
4831 | struct io_sr_msg *sr = &req->sr_msg; |
4832 | struct msghdr msg; | |
4833 | void __user *buf = sr->buf; | |
fddaface | 4834 | struct socket *sock; |
7a7cacba PB |
4835 | struct iovec iov; |
4836 | unsigned flags; | |
bcda7baa | 4837 | int ret, cflags = 0; |
fddaface | 4838 | |
fddaface | 4839 | sock = sock_from_file(req->file, &ret); |
7a7cacba PB |
4840 | if (unlikely(!sock)) |
4841 | return ret; | |
fddaface | 4842 | |
bc02ef33 | 4843 | if (req->flags & REQ_F_BUFFER_SELECT) { |
7fbb1b54 | 4844 | kbuf = io_recv_buffer_select(req, !force_nonblock); |
bcda7baa JA |
4845 | if (IS_ERR(kbuf)) |
4846 | return PTR_ERR(kbuf); | |
7a7cacba | 4847 | buf = u64_to_user_ptr(kbuf->addr); |
bc02ef33 | 4848 | } |
bcda7baa | 4849 | |
7a7cacba | 4850 | ret = import_single_range(READ, buf, sr->len, &iov, &msg.msg_iter); |
14c32eee PB |
4851 | if (unlikely(ret)) |
4852 | goto out_free; | |
fddaface | 4853 | |
7a7cacba PB |
4854 | msg.msg_name = NULL; |
4855 | msg.msg_control = NULL; | |
4856 | msg.msg_controllen = 0; | |
4857 | msg.msg_namelen = 0; | |
4858 | msg.msg_iocb = NULL; | |
4859 | msg.msg_flags = 0; | |
fddaface | 4860 | |
7a7cacba PB |
4861 | flags = req->sr_msg.msg_flags; |
4862 | if (flags & MSG_DONTWAIT) | |
4863 | req->flags |= REQ_F_NOWAIT; | |
4864 | else if (force_nonblock) | |
4865 | flags |= MSG_DONTWAIT; | |
4866 | ||
4867 | ret = sock_recvmsg(sock, &msg, flags); | |
4868 | if (force_nonblock && ret == -EAGAIN) | |
4869 | return -EAGAIN; | |
4870 | if (ret == -ERESTARTSYS) | |
4871 | ret = -EINTR; | |
14c32eee | 4872 | out_free: |
7fbb1b54 PB |
4873 | if (req->flags & REQ_F_BUFFER_SELECTED) |
4874 | cflags = io_put_recv_kbuf(req); | |
fddaface JA |
4875 | if (ret < 0) |
4876 | req_set_fail_links(req); | |
229a7b63 | 4877 | __io_req_complete(req, ret, cflags, cs); |
fddaface | 4878 | return 0; |
fddaface JA |
4879 | } |
4880 | ||
3529d8c2 | 4881 | static int io_accept_prep(struct io_kiocb *req, const struct io_uring_sqe *sqe) |
17f2fe35 | 4882 | { |
8ed8d3c3 JA |
4883 | struct io_accept *accept = &req->accept; |
4884 | ||
14587a46 | 4885 | if (unlikely(req->ctx->flags & IORING_SETUP_IOPOLL)) |
17f2fe35 | 4886 | return -EINVAL; |
8042d6ce | 4887 | if (sqe->ioprio || sqe->len || sqe->buf_index) |
17f2fe35 JA |
4888 | return -EINVAL; |
4889 | ||
d55e5f5b JA |
4890 | accept->addr = u64_to_user_ptr(READ_ONCE(sqe->addr)); |
4891 | accept->addr_len = u64_to_user_ptr(READ_ONCE(sqe->addr2)); | |
8ed8d3c3 | 4892 | accept->flags = READ_ONCE(sqe->accept_flags); |
09952e3e | 4893 | accept->nofile = rlimit(RLIMIT_NOFILE); |
8ed8d3c3 | 4894 | return 0; |
8ed8d3c3 | 4895 | } |
17f2fe35 | 4896 | |
229a7b63 JA |
4897 | static int io_accept(struct io_kiocb *req, bool force_nonblock, |
4898 | struct io_comp_state *cs) | |
8ed8d3c3 JA |
4899 | { |
4900 | struct io_accept *accept = &req->accept; | |
ac45abc0 | 4901 | unsigned int file_flags = force_nonblock ? O_NONBLOCK : 0; |
8ed8d3c3 JA |
4902 | int ret; |
4903 | ||
e697deed JX |
4904 | if (req->file->f_flags & O_NONBLOCK) |
4905 | req->flags |= REQ_F_NOWAIT; | |
4906 | ||
8ed8d3c3 | 4907 | ret = __sys_accept4_file(req->file, file_flags, accept->addr, |
09952e3e JA |
4908 | accept->addr_len, accept->flags, |
4909 | accept->nofile); | |
8ed8d3c3 | 4910 | if (ret == -EAGAIN && force_nonblock) |
17f2fe35 | 4911 | return -EAGAIN; |
ac45abc0 PB |
4912 | if (ret < 0) { |
4913 | if (ret == -ERESTARTSYS) | |
4914 | ret = -EINTR; | |
4e88d6e7 | 4915 | req_set_fail_links(req); |
ac45abc0 | 4916 | } |
229a7b63 | 4917 | __io_req_complete(req, ret, 0, cs); |
17f2fe35 | 4918 | return 0; |
8ed8d3c3 JA |
4919 | } |
4920 | ||
3529d8c2 | 4921 | static int io_connect_prep(struct io_kiocb *req, const struct io_uring_sqe *sqe) |
f499a021 | 4922 | { |
3529d8c2 | 4923 | struct io_connect *conn = &req->connect; |
e8c2bc1f | 4924 | struct io_async_connect *io = req->async_data; |
f499a021 | 4925 | |
14587a46 | 4926 | if (unlikely(req->ctx->flags & IORING_SETUP_IOPOLL)) |
3fbb51c1 JA |
4927 | return -EINVAL; |
4928 | if (sqe->ioprio || sqe->len || sqe->buf_index || sqe->rw_flags) | |
4929 | return -EINVAL; | |
4930 | ||
3529d8c2 JA |
4931 | conn->addr = u64_to_user_ptr(READ_ONCE(sqe->addr)); |
4932 | conn->addr_len = READ_ONCE(sqe->addr2); | |
4933 | ||
4934 | if (!io) | |
4935 | return 0; | |
4936 | ||
4937 | return move_addr_to_kernel(conn->addr, conn->addr_len, | |
e8c2bc1f | 4938 | &io->address); |
f499a021 JA |
4939 | } |
4940 | ||
229a7b63 JA |
4941 | static int io_connect(struct io_kiocb *req, bool force_nonblock, |
4942 | struct io_comp_state *cs) | |
f8e85cf2 | 4943 | { |
e8c2bc1f | 4944 | struct io_async_connect __io, *io; |
f8e85cf2 | 4945 | unsigned file_flags; |
3fbb51c1 | 4946 | int ret; |
f8e85cf2 | 4947 | |
e8c2bc1f JA |
4948 | if (req->async_data) { |
4949 | io = req->async_data; | |
f499a021 | 4950 | } else { |
3529d8c2 JA |
4951 | ret = move_addr_to_kernel(req->connect.addr, |
4952 | req->connect.addr_len, | |
e8c2bc1f | 4953 | &__io.address); |
f499a021 JA |
4954 | if (ret) |
4955 | goto out; | |
4956 | io = &__io; | |
4957 | } | |
4958 | ||
3fbb51c1 JA |
4959 | file_flags = force_nonblock ? O_NONBLOCK : 0; |
4960 | ||
e8c2bc1f | 4961 | ret = __sys_connect_file(req->file, &io->address, |
3fbb51c1 | 4962 | req->connect.addr_len, file_flags); |
87f80d62 | 4963 | if ((ret == -EAGAIN || ret == -EINPROGRESS) && force_nonblock) { |
e8c2bc1f | 4964 | if (req->async_data) |
b7bb4f7d | 4965 | return -EAGAIN; |
e8c2bc1f | 4966 | if (io_alloc_async_data(req)) { |
f499a021 JA |
4967 | ret = -ENOMEM; |
4968 | goto out; | |
4969 | } | |
e8c2bc1f JA |
4970 | io = req->async_data; |
4971 | memcpy(req->async_data, &__io, sizeof(__io)); | |
f8e85cf2 | 4972 | return -EAGAIN; |
f499a021 | 4973 | } |
f8e85cf2 JA |
4974 | if (ret == -ERESTARTSYS) |
4975 | ret = -EINTR; | |
f499a021 | 4976 | out: |
4e88d6e7 JA |
4977 | if (ret < 0) |
4978 | req_set_fail_links(req); | |
229a7b63 | 4979 | __io_req_complete(req, ret, 0, cs); |
f8e85cf2 | 4980 | return 0; |
469956e8 Y |
4981 | } |
4982 | #else /* !CONFIG_NET */ | |
4983 | static int io_sendmsg_prep(struct io_kiocb *req, const struct io_uring_sqe *sqe) | |
4984 | { | |
f8e85cf2 | 4985 | return -EOPNOTSUPP; |
f8e85cf2 JA |
4986 | } |
4987 | ||
1e16c2f9 RD |
4988 | static int io_sendmsg(struct io_kiocb *req, bool force_nonblock, |
4989 | struct io_comp_state *cs) | |
469956e8 Y |
4990 | { |
4991 | return -EOPNOTSUPP; | |
4992 | } | |
4993 | ||
1e16c2f9 RD |
4994 | static int io_send(struct io_kiocb *req, bool force_nonblock, |
4995 | struct io_comp_state *cs) | |
469956e8 Y |
4996 | { |
4997 | return -EOPNOTSUPP; | |
4998 | } | |
4999 | ||
5000 | static int io_recvmsg_prep(struct io_kiocb *req, | |
5001 | const struct io_uring_sqe *sqe) | |
5002 | { | |
5003 | return -EOPNOTSUPP; | |
5004 | } | |
5005 | ||
1e16c2f9 RD |
5006 | static int io_recvmsg(struct io_kiocb *req, bool force_nonblock, |
5007 | struct io_comp_state *cs) | |
469956e8 Y |
5008 | { |
5009 | return -EOPNOTSUPP; | |
5010 | } | |
5011 | ||
1e16c2f9 RD |
5012 | static int io_recv(struct io_kiocb *req, bool force_nonblock, |
5013 | struct io_comp_state *cs) | |
469956e8 Y |
5014 | { |
5015 | return -EOPNOTSUPP; | |
5016 | } | |
5017 | ||
5018 | static int io_accept_prep(struct io_kiocb *req, const struct io_uring_sqe *sqe) | |
5019 | { | |
5020 | return -EOPNOTSUPP; | |
5021 | } | |
5022 | ||
1e16c2f9 RD |
5023 | static int io_accept(struct io_kiocb *req, bool force_nonblock, |
5024 | struct io_comp_state *cs) | |
469956e8 Y |
5025 | { |
5026 | return -EOPNOTSUPP; | |
5027 | } | |
ce593a6c | 5028 | |
469956e8 Y |
5029 | static int io_connect_prep(struct io_kiocb *req, const struct io_uring_sqe *sqe) |
5030 | { | |
5031 | return -EOPNOTSUPP; | |
5032 | } | |
5033 | ||
1e16c2f9 RD |
5034 | static int io_connect(struct io_kiocb *req, bool force_nonblock, |
5035 | struct io_comp_state *cs) | |
469956e8 | 5036 | { |
f8e85cf2 | 5037 | return -EOPNOTSUPP; |
ce593a6c | 5038 | } |
469956e8 | 5039 | #endif /* CONFIG_NET */ |
f8e85cf2 | 5040 | |
d7718a9d JA |
5041 | struct io_poll_table { |
5042 | struct poll_table_struct pt; | |
5043 | struct io_kiocb *req; | |
5044 | int error; | |
5045 | }; | |
ce593a6c | 5046 | |
d7718a9d JA |
5047 | static int __io_async_wake(struct io_kiocb *req, struct io_poll_iocb *poll, |
5048 | __poll_t mask, task_work_func_t func) | |
5049 | { | |
fd7d6de2 | 5050 | bool twa_signal_ok; |
aa96bf8a | 5051 | int ret; |
d7718a9d JA |
5052 | |
5053 | /* for instances that support it check for an event match first: */ | |
5054 | if (mask && !(mask & poll->events)) | |
5055 | return 0; | |
5056 | ||
5057 | trace_io_uring_task_add(req->ctx, req->opcode, req->user_data, mask); | |
5058 | ||
5059 | list_del_init(&poll->wait.entry); | |
5060 | ||
d7718a9d JA |
5061 | req->result = mask; |
5062 | init_task_work(&req->task_work, func); | |
6d816e08 JA |
5063 | percpu_ref_get(&req->ctx->refs); |
5064 | ||
fd7d6de2 JA |
5065 | /* |
5066 | * If we using the signalfd wait_queue_head for this wakeup, then | |
5067 | * it's not safe to use TWA_SIGNAL as we could be recursing on the | |
5068 | * tsk->sighand->siglock on doing the wakeup. Should not be needed | |
5069 | * either, as the normal wakeup will suffice. | |
5070 | */ | |
5071 | twa_signal_ok = (poll->head != &req->task->sighand->signalfd_wqh); | |
5072 | ||
d7718a9d | 5073 | /* |
e3aabf95 JA |
5074 | * If this fails, then the task is exiting. When a task exits, the |
5075 | * work gets canceled, so just cancel this request as well instead | |
5076 | * of executing it. We can't safely execute it anyway, as we may not | |
5077 | * have the needed state needed for it anyway. | |
d7718a9d | 5078 | */ |
87c4311f | 5079 | ret = io_req_task_work_add(req, twa_signal_ok); |
aa96bf8a | 5080 | if (unlikely(ret)) { |
c2c4c83c JA |
5081 | struct task_struct *tsk; |
5082 | ||
e3aabf95 | 5083 | WRITE_ONCE(poll->canceled, true); |
aa96bf8a | 5084 | tsk = io_wq_get_task(req->ctx->io_wq); |
91989c70 | 5085 | task_work_add(tsk, &req->task_work, TWA_NONE); |
ce593a6c | 5086 | wake_up_process(tsk); |
aa96bf8a | 5087 | } |
d7718a9d JA |
5088 | return 1; |
5089 | } | |
5090 | ||
74ce6ce4 JA |
5091 | static bool io_poll_rewait(struct io_kiocb *req, struct io_poll_iocb *poll) |
5092 | __acquires(&req->ctx->completion_lock) | |
5093 | { | |
5094 | struct io_ring_ctx *ctx = req->ctx; | |
5095 | ||
5096 | if (!req->result && !READ_ONCE(poll->canceled)) { | |
5097 | struct poll_table_struct pt = { ._key = poll->events }; | |
5098 | ||
5099 | req->result = vfs_poll(req->file, &pt) & poll->events; | |
5100 | } | |
5101 | ||
5102 | spin_lock_irq(&ctx->completion_lock); | |
5103 | if (!req->result && !READ_ONCE(poll->canceled)) { | |
5104 | add_wait_queue(poll->head, &poll->wait); | |
5105 | return true; | |
5106 | } | |
5107 | ||
5108 | return false; | |
5109 | } | |
5110 | ||
d4e7cd36 | 5111 | static struct io_poll_iocb *io_poll_get_double(struct io_kiocb *req) |
18bceab1 | 5112 | { |
e8c2bc1f | 5113 | /* pure poll stashes this in ->async_data, poll driven retry elsewhere */ |
d4e7cd36 | 5114 | if (req->opcode == IORING_OP_POLL_ADD) |
e8c2bc1f | 5115 | return req->async_data; |
d4e7cd36 JA |
5116 | return req->apoll->double_poll; |
5117 | } | |
5118 | ||
5119 | static struct io_poll_iocb *io_poll_get_single(struct io_kiocb *req) | |
5120 | { | |
5121 | if (req->opcode == IORING_OP_POLL_ADD) | |
5122 | return &req->poll; | |
5123 | return &req->apoll->poll; | |
5124 | } | |
5125 | ||
5126 | static void io_poll_remove_double(struct io_kiocb *req) | |
5127 | { | |
5128 | struct io_poll_iocb *poll = io_poll_get_double(req); | |
18bceab1 JA |
5129 | |
5130 | lockdep_assert_held(&req->ctx->completion_lock); | |
5131 | ||
5132 | if (poll && poll->head) { | |
5133 | struct wait_queue_head *head = poll->head; | |
5134 | ||
5135 | spin_lock(&head->lock); | |
5136 | list_del_init(&poll->wait.entry); | |
5137 | if (poll->wait.private) | |
5138 | refcount_dec(&req->refs); | |
5139 | poll->head = NULL; | |
5140 | spin_unlock(&head->lock); | |
5141 | } | |
5142 | } | |
5143 | ||
5144 | static void io_poll_complete(struct io_kiocb *req, __poll_t mask, int error) | |
5145 | { | |
5146 | struct io_ring_ctx *ctx = req->ctx; | |
5147 | ||
d4e7cd36 | 5148 | io_poll_remove_double(req); |
18bceab1 JA |
5149 | req->poll.done = true; |
5150 | io_cqring_fill_event(req, error ? error : mangle_poll(mask)); | |
5151 | io_commit_cqring(ctx); | |
5152 | } | |
5153 | ||
dd221f46 | 5154 | static void io_poll_task_func(struct callback_head *cb) |
18bceab1 | 5155 | { |
dd221f46 | 5156 | struct io_kiocb *req = container_of(cb, struct io_kiocb, task_work); |
18bceab1 | 5157 | struct io_ring_ctx *ctx = req->ctx; |
dd221f46 | 5158 | struct io_kiocb *nxt; |
18bceab1 JA |
5159 | |
5160 | if (io_poll_rewait(req, &req->poll)) { | |
5161 | spin_unlock_irq(&ctx->completion_lock); | |
dd221f46 PB |
5162 | } else { |
5163 | hash_del(&req->hash_node); | |
5164 | io_poll_complete(req, req->result, 0); | |
5165 | spin_unlock_irq(&ctx->completion_lock); | |
18bceab1 | 5166 | |
dd221f46 PB |
5167 | nxt = io_put_req_find_next(req); |
5168 | io_cqring_ev_posted(ctx); | |
5169 | if (nxt) | |
5170 | __io_req_task_submit(nxt); | |
5171 | } | |
18bceab1 | 5172 | |
6d816e08 | 5173 | percpu_ref_put(&ctx->refs); |
18bceab1 JA |
5174 | } |
5175 | ||
5176 | static int io_poll_double_wake(struct wait_queue_entry *wait, unsigned mode, | |
5177 | int sync, void *key) | |
5178 | { | |
5179 | struct io_kiocb *req = wait->private; | |
d4e7cd36 | 5180 | struct io_poll_iocb *poll = io_poll_get_single(req); |
18bceab1 JA |
5181 | __poll_t mask = key_to_poll(key); |
5182 | ||
5183 | /* for instances that support it check for an event match first: */ | |
5184 | if (mask && !(mask & poll->events)) | |
5185 | return 0; | |
5186 | ||
8706e04e JA |
5187 | list_del_init(&wait->entry); |
5188 | ||
807abcb0 | 5189 | if (poll && poll->head) { |
18bceab1 JA |
5190 | bool done; |
5191 | ||
807abcb0 JA |
5192 | spin_lock(&poll->head->lock); |
5193 | done = list_empty(&poll->wait.entry); | |
18bceab1 | 5194 | if (!done) |
807abcb0 | 5195 | list_del_init(&poll->wait.entry); |
d4e7cd36 JA |
5196 | /* make sure double remove sees this as being gone */ |
5197 | wait->private = NULL; | |
807abcb0 | 5198 | spin_unlock(&poll->head->lock); |
c8b5e260 JA |
5199 | if (!done) { |
5200 | /* use wait func handler, so it matches the rq type */ | |
5201 | poll->wait.func(&poll->wait, mode, sync, key); | |
5202 | } | |
18bceab1 JA |
5203 | } |
5204 | refcount_dec(&req->refs); | |
5205 | return 1; | |
5206 | } | |
5207 | ||
5208 | static void io_init_poll_iocb(struct io_poll_iocb *poll, __poll_t events, | |
5209 | wait_queue_func_t wake_func) | |
5210 | { | |
5211 | poll->head = NULL; | |
5212 | poll->done = false; | |
5213 | poll->canceled = false; | |
5214 | poll->events = events; | |
5215 | INIT_LIST_HEAD(&poll->wait.entry); | |
5216 | init_waitqueue_func_entry(&poll->wait, wake_func); | |
5217 | } | |
5218 | ||
5219 | static void __io_queue_proc(struct io_poll_iocb *poll, struct io_poll_table *pt, | |
807abcb0 JA |
5220 | struct wait_queue_head *head, |
5221 | struct io_poll_iocb **poll_ptr) | |
18bceab1 JA |
5222 | { |
5223 | struct io_kiocb *req = pt->req; | |
5224 | ||
5225 | /* | |
5226 | * If poll->head is already set, it's because the file being polled | |
5227 | * uses multiple waitqueues for poll handling (eg one for read, one | |
5228 | * for write). Setup a separate io_poll_iocb if this happens. | |
5229 | */ | |
5230 | if (unlikely(poll->head)) { | |
58852d4d PB |
5231 | struct io_poll_iocb *poll_one = poll; |
5232 | ||
18bceab1 | 5233 | /* already have a 2nd entry, fail a third attempt */ |
807abcb0 | 5234 | if (*poll_ptr) { |
18bceab1 JA |
5235 | pt->error = -EINVAL; |
5236 | return; | |
5237 | } | |
5238 | poll = kmalloc(sizeof(*poll), GFP_ATOMIC); | |
5239 | if (!poll) { | |
5240 | pt->error = -ENOMEM; | |
5241 | return; | |
5242 | } | |
58852d4d | 5243 | io_init_poll_iocb(poll, poll_one->events, io_poll_double_wake); |
18bceab1 JA |
5244 | refcount_inc(&req->refs); |
5245 | poll->wait.private = req; | |
807abcb0 | 5246 | *poll_ptr = poll; |
18bceab1 JA |
5247 | } |
5248 | ||
5249 | pt->error = 0; | |
5250 | poll->head = head; | |
a31eb4a2 JX |
5251 | |
5252 | if (poll->events & EPOLLEXCLUSIVE) | |
5253 | add_wait_queue_exclusive(head, &poll->wait); | |
5254 | else | |
5255 | add_wait_queue(head, &poll->wait); | |
18bceab1 JA |
5256 | } |
5257 | ||
5258 | static void io_async_queue_proc(struct file *file, struct wait_queue_head *head, | |
5259 | struct poll_table_struct *p) | |
5260 | { | |
5261 | struct io_poll_table *pt = container_of(p, struct io_poll_table, pt); | |
807abcb0 | 5262 | struct async_poll *apoll = pt->req->apoll; |
18bceab1 | 5263 | |
807abcb0 | 5264 | __io_queue_proc(&apoll->poll, pt, head, &apoll->double_poll); |
18bceab1 JA |
5265 | } |
5266 | ||
d7718a9d JA |
5267 | static void io_async_task_func(struct callback_head *cb) |
5268 | { | |
5269 | struct io_kiocb *req = container_of(cb, struct io_kiocb, task_work); | |
5270 | struct async_poll *apoll = req->apoll; | |
5271 | struct io_ring_ctx *ctx = req->ctx; | |
5272 | ||
5273 | trace_io_uring_task_run(req->ctx, req->opcode, req->user_data); | |
5274 | ||
74ce6ce4 | 5275 | if (io_poll_rewait(req, &apoll->poll)) { |
d7718a9d | 5276 | spin_unlock_irq(&ctx->completion_lock); |
6d816e08 | 5277 | percpu_ref_put(&ctx->refs); |
74ce6ce4 | 5278 | return; |
d7718a9d JA |
5279 | } |
5280 | ||
31067255 | 5281 | /* If req is still hashed, it cannot have been canceled. Don't check. */ |
0be0b0e3 | 5282 | if (hash_hashed(&req->hash_node)) |
74ce6ce4 | 5283 | hash_del(&req->hash_node); |
2bae047e | 5284 | |
d4e7cd36 | 5285 | io_poll_remove_double(req); |
74ce6ce4 JA |
5286 | spin_unlock_irq(&ctx->completion_lock); |
5287 | ||
0be0b0e3 PB |
5288 | if (!READ_ONCE(apoll->poll.canceled)) |
5289 | __io_req_task_submit(req); | |
5290 | else | |
5291 | __io_req_task_cancel(req, -ECANCELED); | |
aa340845 | 5292 | |
6d816e08 | 5293 | percpu_ref_put(&ctx->refs); |
807abcb0 | 5294 | kfree(apoll->double_poll); |
31067255 | 5295 | kfree(apoll); |
d7718a9d JA |
5296 | } |
5297 | ||
5298 | static int io_async_wake(struct wait_queue_entry *wait, unsigned mode, int sync, | |
5299 | void *key) | |
5300 | { | |
5301 | struct io_kiocb *req = wait->private; | |
5302 | struct io_poll_iocb *poll = &req->apoll->poll; | |
5303 | ||
5304 | trace_io_uring_poll_wake(req->ctx, req->opcode, req->user_data, | |
5305 | key_to_poll(key)); | |
5306 | ||
5307 | return __io_async_wake(req, poll, key_to_poll(key), io_async_task_func); | |
5308 | } | |
5309 | ||
5310 | static void io_poll_req_insert(struct io_kiocb *req) | |
5311 | { | |
5312 | struct io_ring_ctx *ctx = req->ctx; | |
5313 | struct hlist_head *list; | |
5314 | ||
5315 | list = &ctx->cancel_hash[hash_long(req->user_data, ctx->cancel_hash_bits)]; | |
5316 | hlist_add_head(&req->hash_node, list); | |
5317 | } | |
5318 | ||
5319 | static __poll_t __io_arm_poll_handler(struct io_kiocb *req, | |
5320 | struct io_poll_iocb *poll, | |
5321 | struct io_poll_table *ipt, __poll_t mask, | |
5322 | wait_queue_func_t wake_func) | |
5323 | __acquires(&ctx->completion_lock) | |
5324 | { | |
5325 | struct io_ring_ctx *ctx = req->ctx; | |
5326 | bool cancel = false; | |
5327 | ||
4d52f338 | 5328 | INIT_HLIST_NODE(&req->hash_node); |
18bceab1 | 5329 | io_init_poll_iocb(poll, mask, wake_func); |
b90cd197 | 5330 | poll->file = req->file; |
18bceab1 | 5331 | poll->wait.private = req; |
d7718a9d JA |
5332 | |
5333 | ipt->pt._key = mask; | |
5334 | ipt->req = req; | |
5335 | ipt->error = -EINVAL; | |
5336 | ||
d7718a9d JA |
5337 | mask = vfs_poll(req->file, &ipt->pt) & poll->events; |
5338 | ||
5339 | spin_lock_irq(&ctx->completion_lock); | |
5340 | if (likely(poll->head)) { | |
5341 | spin_lock(&poll->head->lock); | |
5342 | if (unlikely(list_empty(&poll->wait.entry))) { | |
5343 | if (ipt->error) | |
5344 | cancel = true; | |
5345 | ipt->error = 0; | |
5346 | mask = 0; | |
5347 | } | |
5348 | if (mask || ipt->error) | |
5349 | list_del_init(&poll->wait.entry); | |
5350 | else if (cancel) | |
5351 | WRITE_ONCE(poll->canceled, true); | |
5352 | else if (!poll->done) /* actually waiting for an event */ | |
5353 | io_poll_req_insert(req); | |
5354 | spin_unlock(&poll->head->lock); | |
5355 | } | |
5356 | ||
5357 | return mask; | |
5358 | } | |
5359 | ||
5360 | static bool io_arm_poll_handler(struct io_kiocb *req) | |
5361 | { | |
5362 | const struct io_op_def *def = &io_op_defs[req->opcode]; | |
5363 | struct io_ring_ctx *ctx = req->ctx; | |
5364 | struct async_poll *apoll; | |
5365 | struct io_poll_table ipt; | |
5366 | __poll_t mask, ret; | |
9dab14b8 | 5367 | int rw; |
d7718a9d JA |
5368 | |
5369 | if (!req->file || !file_can_poll(req->file)) | |
5370 | return false; | |
24c74678 | 5371 | if (req->flags & REQ_F_POLLED) |
d7718a9d | 5372 | return false; |
9dab14b8 JA |
5373 | if (def->pollin) |
5374 | rw = READ; | |
5375 | else if (def->pollout) | |
5376 | rw = WRITE; | |
5377 | else | |
5378 | return false; | |
5379 | /* if we can't nonblock try, then no point in arming a poll handler */ | |
5380 | if (!io_file_supports_async(req->file, rw)) | |
d7718a9d JA |
5381 | return false; |
5382 | ||
5383 | apoll = kmalloc(sizeof(*apoll), GFP_ATOMIC); | |
5384 | if (unlikely(!apoll)) | |
5385 | return false; | |
807abcb0 | 5386 | apoll->double_poll = NULL; |
d7718a9d JA |
5387 | |
5388 | req->flags |= REQ_F_POLLED; | |
d7718a9d | 5389 | req->apoll = apoll; |
d7718a9d | 5390 | |
8755d97a | 5391 | mask = 0; |
d7718a9d | 5392 | if (def->pollin) |
8755d97a | 5393 | mask |= POLLIN | POLLRDNORM; |
d7718a9d JA |
5394 | if (def->pollout) |
5395 | mask |= POLLOUT | POLLWRNORM; | |
901341bb LH |
5396 | |
5397 | /* If reading from MSG_ERRQUEUE using recvmsg, ignore POLLIN */ | |
5398 | if ((req->opcode == IORING_OP_RECVMSG) && | |
5399 | (req->sr_msg.msg_flags & MSG_ERRQUEUE)) | |
5400 | mask &= ~POLLIN; | |
5401 | ||
d7718a9d JA |
5402 | mask |= POLLERR | POLLPRI; |
5403 | ||
5404 | ipt.pt._qproc = io_async_queue_proc; | |
5405 | ||
5406 | ret = __io_arm_poll_handler(req, &apoll->poll, &ipt, mask, | |
5407 | io_async_wake); | |
a36da65c | 5408 | if (ret || ipt.error) { |
d4e7cd36 | 5409 | io_poll_remove_double(req); |
d7718a9d | 5410 | spin_unlock_irq(&ctx->completion_lock); |
807abcb0 | 5411 | kfree(apoll->double_poll); |
d7718a9d JA |
5412 | kfree(apoll); |
5413 | return false; | |
5414 | } | |
5415 | spin_unlock_irq(&ctx->completion_lock); | |
5416 | trace_io_uring_poll_arm(ctx, req->opcode, req->user_data, mask, | |
5417 | apoll->poll.events); | |
5418 | return true; | |
5419 | } | |
5420 | ||
5421 | static bool __io_poll_remove_one(struct io_kiocb *req, | |
5422 | struct io_poll_iocb *poll) | |
221c5eb2 | 5423 | { |
b41e9852 | 5424 | bool do_complete = false; |
221c5eb2 JA |
5425 | |
5426 | spin_lock(&poll->head->lock); | |
5427 | WRITE_ONCE(poll->canceled, true); | |
392edb45 JA |
5428 | if (!list_empty(&poll->wait.entry)) { |
5429 | list_del_init(&poll->wait.entry); | |
b41e9852 | 5430 | do_complete = true; |
221c5eb2 JA |
5431 | } |
5432 | spin_unlock(&poll->head->lock); | |
3bfa5bcb | 5433 | hash_del(&req->hash_node); |
d7718a9d JA |
5434 | return do_complete; |
5435 | } | |
5436 | ||
5437 | static bool io_poll_remove_one(struct io_kiocb *req) | |
5438 | { | |
5439 | bool do_complete; | |
5440 | ||
d4e7cd36 JA |
5441 | io_poll_remove_double(req); |
5442 | ||
d7718a9d JA |
5443 | if (req->opcode == IORING_OP_POLL_ADD) { |
5444 | do_complete = __io_poll_remove_one(req, &req->poll); | |
5445 | } else { | |
3bfa5bcb JA |
5446 | struct async_poll *apoll = req->apoll; |
5447 | ||
d7718a9d | 5448 | /* non-poll requests have submit ref still */ |
3bfa5bcb JA |
5449 | do_complete = __io_poll_remove_one(req, &apoll->poll); |
5450 | if (do_complete) { | |
d7718a9d | 5451 | io_put_req(req); |
807abcb0 | 5452 | kfree(apoll->double_poll); |
3bfa5bcb JA |
5453 | kfree(apoll); |
5454 | } | |
b1f573bd XW |
5455 | } |
5456 | ||
b41e9852 JA |
5457 | if (do_complete) { |
5458 | io_cqring_fill_event(req, -ECANCELED); | |
5459 | io_commit_cqring(req->ctx); | |
f254ac04 | 5460 | req_set_fail_links(req); |
216578e5 | 5461 | io_put_req_deferred(req, 1); |
b41e9852 JA |
5462 | } |
5463 | ||
5464 | return do_complete; | |
221c5eb2 JA |
5465 | } |
5466 | ||
76e1b642 JA |
5467 | /* |
5468 | * Returns true if we found and killed one or more poll requests | |
5469 | */ | |
6b81928d PB |
5470 | static bool io_poll_remove_all(struct io_ring_ctx *ctx, struct task_struct *tsk, |
5471 | struct files_struct *files) | |
221c5eb2 | 5472 | { |
78076bb6 | 5473 | struct hlist_node *tmp; |
221c5eb2 | 5474 | struct io_kiocb *req; |
8e2e1faf | 5475 | int posted = 0, i; |
221c5eb2 JA |
5476 | |
5477 | spin_lock_irq(&ctx->completion_lock); | |
78076bb6 JA |
5478 | for (i = 0; i < (1U << ctx->cancel_hash_bits); i++) { |
5479 | struct hlist_head *list; | |
5480 | ||
5481 | list = &ctx->cancel_hash[i]; | |
f3606e3a | 5482 | hlist_for_each_entry_safe(req, tmp, list, hash_node) { |
6b81928d | 5483 | if (io_match_task(req, tsk, files)) |
f3606e3a JA |
5484 | posted += io_poll_remove_one(req); |
5485 | } | |
221c5eb2 JA |
5486 | } |
5487 | spin_unlock_irq(&ctx->completion_lock); | |
b41e9852 | 5488 | |
8e2e1faf JA |
5489 | if (posted) |
5490 | io_cqring_ev_posted(ctx); | |
76e1b642 JA |
5491 | |
5492 | return posted != 0; | |
221c5eb2 JA |
5493 | } |
5494 | ||
47f46768 JA |
5495 | static int io_poll_cancel(struct io_ring_ctx *ctx, __u64 sqe_addr) |
5496 | { | |
78076bb6 | 5497 | struct hlist_head *list; |
47f46768 JA |
5498 | struct io_kiocb *req; |
5499 | ||
78076bb6 JA |
5500 | list = &ctx->cancel_hash[hash_long(sqe_addr, ctx->cancel_hash_bits)]; |
5501 | hlist_for_each_entry(req, list, hash_node) { | |
b41e9852 JA |
5502 | if (sqe_addr != req->user_data) |
5503 | continue; | |
5504 | if (io_poll_remove_one(req)) | |
eac406c6 | 5505 | return 0; |
b41e9852 | 5506 | return -EALREADY; |
47f46768 JA |
5507 | } |
5508 | ||
5509 | return -ENOENT; | |
5510 | } | |
5511 | ||
3529d8c2 JA |
5512 | static int io_poll_remove_prep(struct io_kiocb *req, |
5513 | const struct io_uring_sqe *sqe) | |
0969e783 | 5514 | { |
0969e783 JA |
5515 | if (unlikely(req->ctx->flags & IORING_SETUP_IOPOLL)) |
5516 | return -EINVAL; | |
5517 | if (sqe->ioprio || sqe->off || sqe->len || sqe->buf_index || | |
5518 | sqe->poll_events) | |
5519 | return -EINVAL; | |
5520 | ||
018043be | 5521 | req->poll_remove.addr = READ_ONCE(sqe->addr); |
0969e783 JA |
5522 | return 0; |
5523 | } | |
5524 | ||
221c5eb2 JA |
5525 | /* |
5526 | * Find a running poll command that matches one specified in sqe->addr, | |
5527 | * and remove it if found. | |
5528 | */ | |
fc4df999 | 5529 | static int io_poll_remove(struct io_kiocb *req) |
221c5eb2 JA |
5530 | { |
5531 | struct io_ring_ctx *ctx = req->ctx; | |
47f46768 | 5532 | int ret; |
221c5eb2 | 5533 | |
221c5eb2 | 5534 | spin_lock_irq(&ctx->completion_lock); |
018043be | 5535 | ret = io_poll_cancel(ctx, req->poll_remove.addr); |
221c5eb2 JA |
5536 | spin_unlock_irq(&ctx->completion_lock); |
5537 | ||
4e88d6e7 JA |
5538 | if (ret < 0) |
5539 | req_set_fail_links(req); | |
e1e16097 | 5540 | io_req_complete(req, ret); |
221c5eb2 JA |
5541 | return 0; |
5542 | } | |
5543 | ||
221c5eb2 JA |
5544 | static int io_poll_wake(struct wait_queue_entry *wait, unsigned mode, int sync, |
5545 | void *key) | |
5546 | { | |
c2f2eb7d JA |
5547 | struct io_kiocb *req = wait->private; |
5548 | struct io_poll_iocb *poll = &req->poll; | |
221c5eb2 | 5549 | |
d7718a9d | 5550 | return __io_async_wake(req, poll, key_to_poll(key), io_poll_task_func); |
221c5eb2 JA |
5551 | } |
5552 | ||
221c5eb2 JA |
5553 | static void io_poll_queue_proc(struct file *file, struct wait_queue_head *head, |
5554 | struct poll_table_struct *p) | |
5555 | { | |
5556 | struct io_poll_table *pt = container_of(p, struct io_poll_table, pt); | |
5557 | ||
e8c2bc1f | 5558 | __io_queue_proc(&pt->req->poll, pt, head, (struct io_poll_iocb **) &pt->req->async_data); |
eac406c6 JA |
5559 | } |
5560 | ||
3529d8c2 | 5561 | static int io_poll_add_prep(struct io_kiocb *req, const struct io_uring_sqe *sqe) |
221c5eb2 JA |
5562 | { |
5563 | struct io_poll_iocb *poll = &req->poll; | |
5769a351 | 5564 | u32 events; |
221c5eb2 JA |
5565 | |
5566 | if (unlikely(req->ctx->flags & IORING_SETUP_IOPOLL)) | |
5567 | return -EINVAL; | |
5568 | if (sqe->addr || sqe->ioprio || sqe->off || sqe->len || sqe->buf_index) | |
5569 | return -EINVAL; | |
5570 | ||
5769a351 JX |
5571 | events = READ_ONCE(sqe->poll32_events); |
5572 | #ifdef __BIG_ENDIAN | |
5573 | events = swahw32(events); | |
5574 | #endif | |
a31eb4a2 JX |
5575 | poll->events = demangle_poll(events) | EPOLLERR | EPOLLHUP | |
5576 | (events & EPOLLEXCLUSIVE); | |
0969e783 JA |
5577 | return 0; |
5578 | } | |
5579 | ||
014db007 | 5580 | static int io_poll_add(struct io_kiocb *req) |
0969e783 JA |
5581 | { |
5582 | struct io_poll_iocb *poll = &req->poll; | |
5583 | struct io_ring_ctx *ctx = req->ctx; | |
5584 | struct io_poll_table ipt; | |
0969e783 | 5585 | __poll_t mask; |
0969e783 | 5586 | |
d7718a9d | 5587 | ipt.pt._qproc = io_poll_queue_proc; |
36703247 | 5588 | |
d7718a9d JA |
5589 | mask = __io_arm_poll_handler(req, &req->poll, &ipt, poll->events, |
5590 | io_poll_wake); | |
221c5eb2 | 5591 | |
8c838788 | 5592 | if (mask) { /* no async, we'd stolen it */ |
221c5eb2 | 5593 | ipt.error = 0; |
b0dd8a41 | 5594 | io_poll_complete(req, mask, 0); |
221c5eb2 | 5595 | } |
221c5eb2 JA |
5596 | spin_unlock_irq(&ctx->completion_lock); |
5597 | ||
8c838788 JA |
5598 | if (mask) { |
5599 | io_cqring_ev_posted(ctx); | |
014db007 | 5600 | io_put_req(req); |
221c5eb2 | 5601 | } |
8c838788 | 5602 | return ipt.error; |
221c5eb2 JA |
5603 | } |
5604 | ||
5262f567 JA |
5605 | static enum hrtimer_restart io_timeout_fn(struct hrtimer *timer) |
5606 | { | |
ad8a48ac JA |
5607 | struct io_timeout_data *data = container_of(timer, |
5608 | struct io_timeout_data, timer); | |
5609 | struct io_kiocb *req = data->req; | |
5610 | struct io_ring_ctx *ctx = req->ctx; | |
5262f567 JA |
5611 | unsigned long flags; |
5612 | ||
5262f567 | 5613 | spin_lock_irqsave(&ctx->completion_lock, flags); |
a71976f3 | 5614 | list_del_init(&req->timeout.list); |
01cec8c1 PB |
5615 | atomic_set(&req->ctx->cq_timeouts, |
5616 | atomic_read(&req->ctx->cq_timeouts) + 1); | |
5617 | ||
78e19bbe | 5618 | io_cqring_fill_event(req, -ETIME); |
5262f567 JA |
5619 | io_commit_cqring(ctx); |
5620 | spin_unlock_irqrestore(&ctx->completion_lock, flags); | |
5621 | ||
5622 | io_cqring_ev_posted(ctx); | |
4e88d6e7 | 5623 | req_set_fail_links(req); |
5262f567 JA |
5624 | io_put_req(req); |
5625 | return HRTIMER_NORESTART; | |
5626 | } | |
5627 | ||
f254ac04 JA |
5628 | static int __io_timeout_cancel(struct io_kiocb *req) |
5629 | { | |
e8c2bc1f | 5630 | struct io_timeout_data *io = req->async_data; |
f254ac04 JA |
5631 | int ret; |
5632 | ||
e8c2bc1f | 5633 | ret = hrtimer_try_to_cancel(&io->timer); |
f254ac04 JA |
5634 | if (ret == -1) |
5635 | return -EALREADY; | |
a71976f3 | 5636 | list_del_init(&req->timeout.list); |
f254ac04 JA |
5637 | |
5638 | req_set_fail_links(req); | |
f254ac04 | 5639 | io_cqring_fill_event(req, -ECANCELED); |
216578e5 | 5640 | io_put_req_deferred(req, 1); |
f254ac04 JA |
5641 | return 0; |
5642 | } | |
5643 | ||
47f46768 JA |
5644 | static int io_timeout_cancel(struct io_ring_ctx *ctx, __u64 user_data) |
5645 | { | |
5646 | struct io_kiocb *req; | |
5647 | int ret = -ENOENT; | |
5648 | ||
135fcde8 | 5649 | list_for_each_entry(req, &ctx->timeout_list, timeout.list) { |
47f46768 | 5650 | if (user_data == req->user_data) { |
47f46768 JA |
5651 | ret = 0; |
5652 | break; | |
5653 | } | |
5654 | } | |
5655 | ||
5656 | if (ret == -ENOENT) | |
5657 | return ret; | |
5658 | ||
f254ac04 | 5659 | return __io_timeout_cancel(req); |
47f46768 JA |
5660 | } |
5661 | ||
3529d8c2 JA |
5662 | static int io_timeout_remove_prep(struct io_kiocb *req, |
5663 | const struct io_uring_sqe *sqe) | |
b29472ee | 5664 | { |
b29472ee JA |
5665 | if (unlikely(req->ctx->flags & IORING_SETUP_IOPOLL)) |
5666 | return -EINVAL; | |
61710e43 DA |
5667 | if (unlikely(req->flags & (REQ_F_FIXED_FILE | REQ_F_BUFFER_SELECT))) |
5668 | return -EINVAL; | |
0bdf7a2d | 5669 | if (sqe->ioprio || sqe->buf_index || sqe->len || sqe->timeout_flags) |
b29472ee JA |
5670 | return -EINVAL; |
5671 | ||
0bdf7a2d | 5672 | req->timeout_rem.addr = READ_ONCE(sqe->addr); |
b29472ee JA |
5673 | return 0; |
5674 | } | |
5675 | ||
11365043 JA |
5676 | /* |
5677 | * Remove or update an existing timeout command | |
5678 | */ | |
fc4df999 | 5679 | static int io_timeout_remove(struct io_kiocb *req) |
11365043 JA |
5680 | { |
5681 | struct io_ring_ctx *ctx = req->ctx; | |
47f46768 | 5682 | int ret; |
11365043 | 5683 | |
11365043 | 5684 | spin_lock_irq(&ctx->completion_lock); |
0bdf7a2d | 5685 | ret = io_timeout_cancel(ctx, req->timeout_rem.addr); |
11365043 | 5686 | |
47f46768 | 5687 | io_cqring_fill_event(req, ret); |
11365043 JA |
5688 | io_commit_cqring(ctx); |
5689 | spin_unlock_irq(&ctx->completion_lock); | |
5262f567 | 5690 | io_cqring_ev_posted(ctx); |
4e88d6e7 JA |
5691 | if (ret < 0) |
5692 | req_set_fail_links(req); | |
ec9c02ad | 5693 | io_put_req(req); |
11365043 | 5694 | return 0; |
5262f567 JA |
5695 | } |
5696 | ||
3529d8c2 | 5697 | static int io_timeout_prep(struct io_kiocb *req, const struct io_uring_sqe *sqe, |
2d28390a | 5698 | bool is_timeout_link) |
5262f567 | 5699 | { |
ad8a48ac | 5700 | struct io_timeout_data *data; |
a41525ab | 5701 | unsigned flags; |
56080b02 | 5702 | u32 off = READ_ONCE(sqe->off); |
5262f567 | 5703 | |
ad8a48ac | 5704 | if (unlikely(req->ctx->flags & IORING_SETUP_IOPOLL)) |
5262f567 | 5705 | return -EINVAL; |
ad8a48ac | 5706 | if (sqe->ioprio || sqe->buf_index || sqe->len != 1) |
a41525ab | 5707 | return -EINVAL; |
56080b02 | 5708 | if (off && is_timeout_link) |
2d28390a | 5709 | return -EINVAL; |
a41525ab JA |
5710 | flags = READ_ONCE(sqe->timeout_flags); |
5711 | if (flags & ~IORING_TIMEOUT_ABS) | |
5262f567 | 5712 | return -EINVAL; |
bdf20073 | 5713 | |
bfe68a22 | 5714 | req->timeout.off = off; |
26a61679 | 5715 | |
e8c2bc1f | 5716 | if (!req->async_data && io_alloc_async_data(req)) |
26a61679 JA |
5717 | return -ENOMEM; |
5718 | ||
e8c2bc1f | 5719 | data = req->async_data; |
ad8a48ac | 5720 | data->req = req; |
ad8a48ac JA |
5721 | |
5722 | if (get_timespec64(&data->ts, u64_to_user_ptr(sqe->addr))) | |
5262f567 JA |
5723 | return -EFAULT; |
5724 | ||
11365043 | 5725 | if (flags & IORING_TIMEOUT_ABS) |
ad8a48ac | 5726 | data->mode = HRTIMER_MODE_ABS; |
11365043 | 5727 | else |
ad8a48ac | 5728 | data->mode = HRTIMER_MODE_REL; |
11365043 | 5729 | |
ad8a48ac JA |
5730 | hrtimer_init(&data->timer, CLOCK_MONOTONIC, data->mode); |
5731 | return 0; | |
5732 | } | |
5733 | ||
fc4df999 | 5734 | static int io_timeout(struct io_kiocb *req) |
ad8a48ac | 5735 | { |
ad8a48ac | 5736 | struct io_ring_ctx *ctx = req->ctx; |
e8c2bc1f | 5737 | struct io_timeout_data *data = req->async_data; |
ad8a48ac | 5738 | struct list_head *entry; |
bfe68a22 | 5739 | u32 tail, off = req->timeout.off; |
ad8a48ac | 5740 | |
733f5c95 | 5741 | spin_lock_irq(&ctx->completion_lock); |
93bd25bb | 5742 | |
5262f567 JA |
5743 | /* |
5744 | * sqe->off holds how many events that need to occur for this | |
93bd25bb JA |
5745 | * timeout event to be satisfied. If it isn't set, then this is |
5746 | * a pure timeout request, sequence isn't used. | |
5262f567 | 5747 | */ |
8eb7e2d0 | 5748 | if (io_is_timeout_noseq(req)) { |
93bd25bb JA |
5749 | entry = ctx->timeout_list.prev; |
5750 | goto add; | |
5751 | } | |
5262f567 | 5752 | |
bfe68a22 PB |
5753 | tail = ctx->cached_cq_tail - atomic_read(&ctx->cq_timeouts); |
5754 | req->timeout.target_seq = tail + off; | |
5262f567 JA |
5755 | |
5756 | /* | |
5757 | * Insertion sort, ensuring the first entry in the list is always | |
5758 | * the one we need first. | |
5759 | */ | |
5262f567 | 5760 | list_for_each_prev(entry, &ctx->timeout_list) { |
135fcde8 PB |
5761 | struct io_kiocb *nxt = list_entry(entry, struct io_kiocb, |
5762 | timeout.list); | |
5262f567 | 5763 | |
8eb7e2d0 | 5764 | if (io_is_timeout_noseq(nxt)) |
93bd25bb | 5765 | continue; |
bfe68a22 PB |
5766 | /* nxt.seq is behind @tail, otherwise would've been completed */ |
5767 | if (off >= nxt->timeout.target_seq - tail) | |
5262f567 JA |
5768 | break; |
5769 | } | |
93bd25bb | 5770 | add: |
135fcde8 | 5771 | list_add(&req->timeout.list, entry); |
ad8a48ac JA |
5772 | data->timer.function = io_timeout_fn; |
5773 | hrtimer_start(&data->timer, timespec64_to_ktime(data->ts), data->mode); | |
5262f567 | 5774 | spin_unlock_irq(&ctx->completion_lock); |
5262f567 JA |
5775 | return 0; |
5776 | } | |
5262f567 | 5777 | |
62755e35 JA |
5778 | static bool io_cancel_cb(struct io_wq_work *work, void *data) |
5779 | { | |
5780 | struct io_kiocb *req = container_of(work, struct io_kiocb, work); | |
5781 | ||
5782 | return req->user_data == (unsigned long) data; | |
5783 | } | |
5784 | ||
e977d6d3 | 5785 | static int io_async_cancel_one(struct io_ring_ctx *ctx, void *sqe_addr) |
62755e35 | 5786 | { |
62755e35 | 5787 | enum io_wq_cancel cancel_ret; |
62755e35 JA |
5788 | int ret = 0; |
5789 | ||
4f26bda1 | 5790 | cancel_ret = io_wq_cancel_cb(ctx->io_wq, io_cancel_cb, sqe_addr, false); |
62755e35 JA |
5791 | switch (cancel_ret) { |
5792 | case IO_WQ_CANCEL_OK: | |
5793 | ret = 0; | |
5794 | break; | |
5795 | case IO_WQ_CANCEL_RUNNING: | |
5796 | ret = -EALREADY; | |
5797 | break; | |
5798 | case IO_WQ_CANCEL_NOTFOUND: | |
5799 | ret = -ENOENT; | |
5800 | break; | |
5801 | } | |
5802 | ||
e977d6d3 JA |
5803 | return ret; |
5804 | } | |
5805 | ||
47f46768 JA |
5806 | static void io_async_find_and_cancel(struct io_ring_ctx *ctx, |
5807 | struct io_kiocb *req, __u64 sqe_addr, | |
014db007 | 5808 | int success_ret) |
47f46768 JA |
5809 | { |
5810 | unsigned long flags; | |
5811 | int ret; | |
5812 | ||
5813 | ret = io_async_cancel_one(ctx, (void *) (unsigned long) sqe_addr); | |
5814 | if (ret != -ENOENT) { | |
5815 | spin_lock_irqsave(&ctx->completion_lock, flags); | |
5816 | goto done; | |
5817 | } | |
5818 | ||
5819 | spin_lock_irqsave(&ctx->completion_lock, flags); | |
5820 | ret = io_timeout_cancel(ctx, sqe_addr); | |
5821 | if (ret != -ENOENT) | |
5822 | goto done; | |
5823 | ret = io_poll_cancel(ctx, sqe_addr); | |
5824 | done: | |
b0dd8a41 JA |
5825 | if (!ret) |
5826 | ret = success_ret; | |
47f46768 JA |
5827 | io_cqring_fill_event(req, ret); |
5828 | io_commit_cqring(ctx); | |
5829 | spin_unlock_irqrestore(&ctx->completion_lock, flags); | |
5830 | io_cqring_ev_posted(ctx); | |
5831 | ||
4e88d6e7 JA |
5832 | if (ret < 0) |
5833 | req_set_fail_links(req); | |
014db007 | 5834 | io_put_req(req); |
47f46768 JA |
5835 | } |
5836 | ||
3529d8c2 JA |
5837 | static int io_async_cancel_prep(struct io_kiocb *req, |
5838 | const struct io_uring_sqe *sqe) | |
e977d6d3 | 5839 | { |
fbf23849 | 5840 | if (unlikely(req->ctx->flags & IORING_SETUP_IOPOLL)) |
e977d6d3 | 5841 | return -EINVAL; |
61710e43 DA |
5842 | if (unlikely(req->flags & (REQ_F_FIXED_FILE | REQ_F_BUFFER_SELECT))) |
5843 | return -EINVAL; | |
5844 | if (sqe->ioprio || sqe->off || sqe->len || sqe->cancel_flags) | |
e977d6d3 JA |
5845 | return -EINVAL; |
5846 | ||
fbf23849 JA |
5847 | req->cancel.addr = READ_ONCE(sqe->addr); |
5848 | return 0; | |
5849 | } | |
5850 | ||
014db007 | 5851 | static int io_async_cancel(struct io_kiocb *req) |
fbf23849 JA |
5852 | { |
5853 | struct io_ring_ctx *ctx = req->ctx; | |
fbf23849 | 5854 | |
014db007 | 5855 | io_async_find_and_cancel(ctx, req, req->cancel.addr, 0); |
5262f567 JA |
5856 | return 0; |
5857 | } | |
5858 | ||
05f3fb3c JA |
5859 | static int io_files_update_prep(struct io_kiocb *req, |
5860 | const struct io_uring_sqe *sqe) | |
5861 | { | |
6ca56f84 JA |
5862 | if (unlikely(req->ctx->flags & IORING_SETUP_SQPOLL)) |
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->rw_flags) | |
05f3fb3c JA |
5867 | return -EINVAL; |
5868 | ||
5869 | req->files_update.offset = READ_ONCE(sqe->off); | |
5870 | req->files_update.nr_args = READ_ONCE(sqe->len); | |
5871 | if (!req->files_update.nr_args) | |
5872 | return -EINVAL; | |
5873 | req->files_update.arg = READ_ONCE(sqe->addr); | |
5874 | return 0; | |
5875 | } | |
5876 | ||
229a7b63 JA |
5877 | static int io_files_update(struct io_kiocb *req, bool force_nonblock, |
5878 | struct io_comp_state *cs) | |
fbf23849 JA |
5879 | { |
5880 | struct io_ring_ctx *ctx = req->ctx; | |
05f3fb3c JA |
5881 | struct io_uring_files_update up; |
5882 | int ret; | |
fbf23849 | 5883 | |
f86cd20c | 5884 | if (force_nonblock) |
05f3fb3c | 5885 | return -EAGAIN; |
05f3fb3c JA |
5886 | |
5887 | up.offset = req->files_update.offset; | |
5888 | up.fds = req->files_update.arg; | |
5889 | ||
5890 | mutex_lock(&ctx->uring_lock); | |
5891 | ret = __io_sqe_files_update(ctx, &up, req->files_update.nr_args); | |
5892 | mutex_unlock(&ctx->uring_lock); | |
5893 | ||
5894 | if (ret < 0) | |
5895 | req_set_fail_links(req); | |
229a7b63 | 5896 | __io_req_complete(req, ret, 0, cs); |
5262f567 JA |
5897 | return 0; |
5898 | } | |
5899 | ||
bfe76559 | 5900 | static int io_req_prep(struct io_kiocb *req, const struct io_uring_sqe *sqe) |
f67676d1 | 5901 | { |
d625c6ee | 5902 | switch (req->opcode) { |
e781573e | 5903 | case IORING_OP_NOP: |
bfe76559 | 5904 | return 0; |
f67676d1 JA |
5905 | case IORING_OP_READV: |
5906 | case IORING_OP_READ_FIXED: | |
3a6820f2 | 5907 | case IORING_OP_READ: |
bfe76559 | 5908 | return io_read_prep(req, sqe); |
f67676d1 JA |
5909 | case IORING_OP_WRITEV: |
5910 | case IORING_OP_WRITE_FIXED: | |
3a6820f2 | 5911 | case IORING_OP_WRITE: |
bfe76559 | 5912 | return io_write_prep(req, sqe); |
0969e783 | 5913 | case IORING_OP_POLL_ADD: |
bfe76559 | 5914 | return io_poll_add_prep(req, sqe); |
0969e783 | 5915 | case IORING_OP_POLL_REMOVE: |
bfe76559 | 5916 | return io_poll_remove_prep(req, sqe); |
8ed8d3c3 | 5917 | case IORING_OP_FSYNC: |
bfe76559 | 5918 | return io_prep_fsync(req, sqe); |
8ed8d3c3 | 5919 | case IORING_OP_SYNC_FILE_RANGE: |
bfe76559 | 5920 | return io_prep_sfr(req, sqe); |
03b1230c | 5921 | case IORING_OP_SENDMSG: |
fddaface | 5922 | case IORING_OP_SEND: |
bfe76559 | 5923 | return io_sendmsg_prep(req, sqe); |
03b1230c | 5924 | case IORING_OP_RECVMSG: |
fddaface | 5925 | case IORING_OP_RECV: |
bfe76559 | 5926 | return io_recvmsg_prep(req, sqe); |
f499a021 | 5927 | case IORING_OP_CONNECT: |
bfe76559 | 5928 | return io_connect_prep(req, sqe); |
2d28390a | 5929 | case IORING_OP_TIMEOUT: |
bfe76559 | 5930 | return io_timeout_prep(req, sqe, false); |
b29472ee | 5931 | case IORING_OP_TIMEOUT_REMOVE: |
bfe76559 | 5932 | return io_timeout_remove_prep(req, sqe); |
fbf23849 | 5933 | case IORING_OP_ASYNC_CANCEL: |
bfe76559 | 5934 | return io_async_cancel_prep(req, sqe); |
2d28390a | 5935 | case IORING_OP_LINK_TIMEOUT: |
bfe76559 | 5936 | return io_timeout_prep(req, sqe, true); |
8ed8d3c3 | 5937 | case IORING_OP_ACCEPT: |
bfe76559 | 5938 | return io_accept_prep(req, sqe); |
d63d1b5e | 5939 | case IORING_OP_FALLOCATE: |
bfe76559 | 5940 | return io_fallocate_prep(req, sqe); |
15b71abe | 5941 | case IORING_OP_OPENAT: |
bfe76559 | 5942 | return io_openat_prep(req, sqe); |
b5dba59e | 5943 | case IORING_OP_CLOSE: |
bfe76559 | 5944 | return io_close_prep(req, sqe); |
05f3fb3c | 5945 | case IORING_OP_FILES_UPDATE: |
bfe76559 | 5946 | return io_files_update_prep(req, sqe); |
eddc7ef5 | 5947 | case IORING_OP_STATX: |
bfe76559 | 5948 | return io_statx_prep(req, sqe); |
4840e418 | 5949 | case IORING_OP_FADVISE: |
bfe76559 | 5950 | return io_fadvise_prep(req, sqe); |
c1ca757b | 5951 | case IORING_OP_MADVISE: |
bfe76559 | 5952 | return io_madvise_prep(req, sqe); |
cebdb986 | 5953 | case IORING_OP_OPENAT2: |
bfe76559 | 5954 | return io_openat2_prep(req, sqe); |
3e4827b0 | 5955 | case IORING_OP_EPOLL_CTL: |
bfe76559 | 5956 | return io_epoll_ctl_prep(req, sqe); |
7d67af2c | 5957 | case IORING_OP_SPLICE: |
bfe76559 | 5958 | return io_splice_prep(req, sqe); |
ddf0322d | 5959 | case IORING_OP_PROVIDE_BUFFERS: |
bfe76559 | 5960 | return io_provide_buffers_prep(req, sqe); |
067524e9 | 5961 | case IORING_OP_REMOVE_BUFFERS: |
bfe76559 | 5962 | return io_remove_buffers_prep(req, sqe); |
f2a8d5c7 | 5963 | case IORING_OP_TEE: |
bfe76559 | 5964 | return io_tee_prep(req, sqe); |
36f4fa68 JA |
5965 | case IORING_OP_SHUTDOWN: |
5966 | return io_shutdown_prep(req, sqe); | |
80a261fd JA |
5967 | case IORING_OP_RENAMEAT: |
5968 | return io_renameat_prep(req, sqe); | |
14a1143b JA |
5969 | case IORING_OP_UNLINKAT: |
5970 | return io_unlinkat_prep(req, sqe); | |
f67676d1 JA |
5971 | } |
5972 | ||
bfe76559 PB |
5973 | printk_once(KERN_WARNING "io_uring: unhandled opcode %d\n", |
5974 | req->opcode); | |
5975 | return-EINVAL; | |
5976 | } | |
5977 | ||
5978 | static int io_req_defer_prep(struct io_kiocb *req, | |
5979 | const struct io_uring_sqe *sqe) | |
5980 | { | |
bfe76559 PB |
5981 | if (!sqe) |
5982 | return 0; | |
5983 | if (io_alloc_async_data(req)) | |
5984 | return -EAGAIN; | |
bfe76559 | 5985 | return io_req_prep(req, sqe); |
f67676d1 JA |
5986 | } |
5987 | ||
9cf7c104 PB |
5988 | static u32 io_get_sequence(struct io_kiocb *req) |
5989 | { | |
5990 | struct io_kiocb *pos; | |
5991 | struct io_ring_ctx *ctx = req->ctx; | |
f2f87370 | 5992 | u32 total_submitted, nr_reqs = 0; |
9cf7c104 | 5993 | |
f2f87370 PB |
5994 | io_for_each_link(pos, req) |
5995 | nr_reqs++; | |
9cf7c104 PB |
5996 | |
5997 | total_submitted = ctx->cached_sq_head - ctx->cached_sq_dropped; | |
5998 | return total_submitted - nr_reqs; | |
5999 | } | |
6000 | ||
3529d8c2 | 6001 | static int io_req_defer(struct io_kiocb *req, const struct io_uring_sqe *sqe) |
de0617e4 | 6002 | { |
a197f664 | 6003 | struct io_ring_ctx *ctx = req->ctx; |
27dc8338 | 6004 | struct io_defer_entry *de; |
f67676d1 | 6005 | int ret; |
9cf7c104 | 6006 | u32 seq; |
de0617e4 | 6007 | |
9d858b21 | 6008 | /* Still need defer if there is pending req in defer list. */ |
9cf7c104 PB |
6009 | if (likely(list_empty_careful(&ctx->defer_list) && |
6010 | !(req->flags & REQ_F_IO_DRAIN))) | |
6011 | return 0; | |
6012 | ||
6013 | seq = io_get_sequence(req); | |
6014 | /* Still a chance to pass the sequence check */ | |
6015 | if (!req_need_defer(req, seq) && list_empty_careful(&ctx->defer_list)) | |
de0617e4 JA |
6016 | return 0; |
6017 | ||
e8c2bc1f | 6018 | if (!req->async_data) { |
650b5481 | 6019 | ret = io_req_defer_prep(req, sqe); |
327d6d96 | 6020 | if (ret) |
650b5481 PB |
6021 | return ret; |
6022 | } | |
cbdcb435 | 6023 | io_prep_async_link(req); |
27dc8338 PB |
6024 | de = kmalloc(sizeof(*de), GFP_KERNEL); |
6025 | if (!de) | |
6026 | return -ENOMEM; | |
2d28390a | 6027 | |
de0617e4 | 6028 | spin_lock_irq(&ctx->completion_lock); |
9cf7c104 | 6029 | if (!req_need_defer(req, seq) && list_empty(&ctx->defer_list)) { |
de0617e4 | 6030 | spin_unlock_irq(&ctx->completion_lock); |
27dc8338 | 6031 | kfree(de); |
ae34817b PB |
6032 | io_queue_async_work(req); |
6033 | return -EIOCBQUEUED; | |
de0617e4 JA |
6034 | } |
6035 | ||
915967f6 | 6036 | trace_io_uring_defer(ctx, req, req->user_data); |
27dc8338 | 6037 | de->req = req; |
9cf7c104 | 6038 | de->seq = seq; |
27dc8338 | 6039 | list_add_tail(&de->list, &ctx->defer_list); |
de0617e4 JA |
6040 | spin_unlock_irq(&ctx->completion_lock); |
6041 | return -EIOCBQUEUED; | |
6042 | } | |
6043 | ||
f573d384 | 6044 | static void io_req_drop_files(struct io_kiocb *req) |
99bc4c38 | 6045 | { |
f573d384 | 6046 | struct io_ring_ctx *ctx = req->ctx; |
c98de08c | 6047 | struct io_uring_task *tctx = req->task->io_uring; |
f573d384 JA |
6048 | unsigned long flags; |
6049 | ||
6050 | spin_lock_irqsave(&ctx->inflight_lock, flags); | |
6051 | list_del(&req->inflight_entry); | |
c98de08c PB |
6052 | if (atomic_read(&tctx->in_idle)) |
6053 | wake_up(&tctx->wait); | |
f573d384 JA |
6054 | spin_unlock_irqrestore(&ctx->inflight_lock, flags); |
6055 | req->flags &= ~REQ_F_INFLIGHT; | |
98447d65 JA |
6056 | put_files_struct(req->work.identity->files); |
6057 | put_nsproxy(req->work.identity->nsproxy); | |
dfead8a8 | 6058 | req->work.flags &= ~IO_WQ_WORK_FILES; |
f573d384 | 6059 | } |
99bc4c38 | 6060 | |
3ca405eb | 6061 | static void __io_clean_op(struct io_kiocb *req) |
99bc4c38 | 6062 | { |
0e1b6fe3 PB |
6063 | if (req->flags & REQ_F_BUFFER_SELECTED) { |
6064 | switch (req->opcode) { | |
6065 | case IORING_OP_READV: | |
6066 | case IORING_OP_READ_FIXED: | |
6067 | case IORING_OP_READ: | |
bcda7baa | 6068 | kfree((void *)(unsigned long)req->rw.addr); |
0e1b6fe3 PB |
6069 | break; |
6070 | case IORING_OP_RECVMSG: | |
6071 | case IORING_OP_RECV: | |
bcda7baa | 6072 | kfree(req->sr_msg.kbuf); |
0e1b6fe3 PB |
6073 | break; |
6074 | } | |
6075 | req->flags &= ~REQ_F_BUFFER_SELECTED; | |
99bc4c38 PB |
6076 | } |
6077 | ||
0e1b6fe3 PB |
6078 | if (req->flags & REQ_F_NEED_CLEANUP) { |
6079 | switch (req->opcode) { | |
6080 | case IORING_OP_READV: | |
6081 | case IORING_OP_READ_FIXED: | |
6082 | case IORING_OP_READ: | |
6083 | case IORING_OP_WRITEV: | |
6084 | case IORING_OP_WRITE_FIXED: | |
e8c2bc1f JA |
6085 | case IORING_OP_WRITE: { |
6086 | struct io_async_rw *io = req->async_data; | |
6087 | if (io->free_iovec) | |
6088 | kfree(io->free_iovec); | |
0e1b6fe3 | 6089 | break; |
e8c2bc1f | 6090 | } |
0e1b6fe3 | 6091 | case IORING_OP_RECVMSG: |
e8c2bc1f JA |
6092 | case IORING_OP_SENDMSG: { |
6093 | struct io_async_msghdr *io = req->async_data; | |
6094 | if (io->iov != io->fast_iov) | |
6095 | kfree(io->iov); | |
0e1b6fe3 | 6096 | break; |
e8c2bc1f | 6097 | } |
0e1b6fe3 PB |
6098 | case IORING_OP_SPLICE: |
6099 | case IORING_OP_TEE: | |
6100 | io_put_file(req, req->splice.file_in, | |
6101 | (req->splice.flags & SPLICE_F_FD_IN_FIXED)); | |
6102 | break; | |
f3cd4850 JA |
6103 | case IORING_OP_OPENAT: |
6104 | case IORING_OP_OPENAT2: | |
6105 | if (req->open.filename) | |
6106 | putname(req->open.filename); | |
6107 | break; | |
80a261fd JA |
6108 | case IORING_OP_RENAMEAT: |
6109 | putname(req->rename.oldpath); | |
6110 | putname(req->rename.newpath); | |
6111 | break; | |
14a1143b JA |
6112 | case IORING_OP_UNLINKAT: |
6113 | putname(req->unlink.filename); | |
6114 | break; | |
0e1b6fe3 PB |
6115 | } |
6116 | req->flags &= ~REQ_F_NEED_CLEANUP; | |
99bc4c38 | 6117 | } |
bb175342 | 6118 | |
f573d384 JA |
6119 | if (req->flags & REQ_F_INFLIGHT) |
6120 | io_req_drop_files(req); | |
99bc4c38 PB |
6121 | } |
6122 | ||
c1379e24 PB |
6123 | static int io_issue_sqe(struct io_kiocb *req, bool force_nonblock, |
6124 | struct io_comp_state *cs) | |
2b188cc1 | 6125 | { |
a197f664 | 6126 | struct io_ring_ctx *ctx = req->ctx; |
d625c6ee | 6127 | int ret; |
2b188cc1 | 6128 | |
d625c6ee | 6129 | switch (req->opcode) { |
2b188cc1 | 6130 | case IORING_OP_NOP: |
229a7b63 | 6131 | ret = io_nop(req, cs); |
2b188cc1 JA |
6132 | break; |
6133 | case IORING_OP_READV: | |
edafccee | 6134 | case IORING_OP_READ_FIXED: |
3a6820f2 | 6135 | case IORING_OP_READ: |
a1d7c393 | 6136 | ret = io_read(req, force_nonblock, cs); |
edafccee | 6137 | break; |
3529d8c2 | 6138 | case IORING_OP_WRITEV: |
edafccee | 6139 | case IORING_OP_WRITE_FIXED: |
3a6820f2 | 6140 | case IORING_OP_WRITE: |
a1d7c393 | 6141 | ret = io_write(req, force_nonblock, cs); |
2b188cc1 | 6142 | break; |
c992fe29 | 6143 | case IORING_OP_FSYNC: |
014db007 | 6144 | ret = io_fsync(req, force_nonblock); |
c992fe29 | 6145 | break; |
221c5eb2 | 6146 | case IORING_OP_POLL_ADD: |
014db007 | 6147 | ret = io_poll_add(req); |
221c5eb2 JA |
6148 | break; |
6149 | case IORING_OP_POLL_REMOVE: | |
fc4df999 | 6150 | ret = io_poll_remove(req); |
221c5eb2 | 6151 | break; |
5d17b4a4 | 6152 | case IORING_OP_SYNC_FILE_RANGE: |
014db007 | 6153 | ret = io_sync_file_range(req, force_nonblock); |
5d17b4a4 | 6154 | break; |
0fa03c62 | 6155 | case IORING_OP_SENDMSG: |
062d04d7 PB |
6156 | ret = io_sendmsg(req, force_nonblock, cs); |
6157 | break; | |
fddaface | 6158 | case IORING_OP_SEND: |
062d04d7 | 6159 | ret = io_send(req, force_nonblock, cs); |
0fa03c62 | 6160 | break; |
aa1fa28f | 6161 | case IORING_OP_RECVMSG: |
062d04d7 PB |
6162 | ret = io_recvmsg(req, force_nonblock, cs); |
6163 | break; | |
fddaface | 6164 | case IORING_OP_RECV: |
062d04d7 | 6165 | ret = io_recv(req, force_nonblock, cs); |
aa1fa28f | 6166 | break; |
5262f567 | 6167 | case IORING_OP_TIMEOUT: |
fc4df999 | 6168 | ret = io_timeout(req); |
5262f567 | 6169 | break; |
11365043 | 6170 | case IORING_OP_TIMEOUT_REMOVE: |
fc4df999 | 6171 | ret = io_timeout_remove(req); |
11365043 | 6172 | break; |
17f2fe35 | 6173 | case IORING_OP_ACCEPT: |
229a7b63 | 6174 | ret = io_accept(req, force_nonblock, cs); |
17f2fe35 | 6175 | break; |
f8e85cf2 | 6176 | case IORING_OP_CONNECT: |
229a7b63 | 6177 | ret = io_connect(req, force_nonblock, cs); |
f8e85cf2 | 6178 | break; |
62755e35 | 6179 | case IORING_OP_ASYNC_CANCEL: |
014db007 | 6180 | ret = io_async_cancel(req); |
62755e35 | 6181 | break; |
d63d1b5e | 6182 | case IORING_OP_FALLOCATE: |
014db007 | 6183 | ret = io_fallocate(req, force_nonblock); |
d63d1b5e | 6184 | break; |
15b71abe | 6185 | case IORING_OP_OPENAT: |
014db007 | 6186 | ret = io_openat(req, force_nonblock); |
15b71abe | 6187 | break; |
b5dba59e | 6188 | case IORING_OP_CLOSE: |
229a7b63 | 6189 | ret = io_close(req, force_nonblock, cs); |
b5dba59e | 6190 | break; |
05f3fb3c | 6191 | case IORING_OP_FILES_UPDATE: |
229a7b63 | 6192 | ret = io_files_update(req, force_nonblock, cs); |
05f3fb3c | 6193 | break; |
eddc7ef5 | 6194 | case IORING_OP_STATX: |
014db007 | 6195 | ret = io_statx(req, force_nonblock); |
eddc7ef5 | 6196 | break; |
4840e418 | 6197 | case IORING_OP_FADVISE: |
014db007 | 6198 | ret = io_fadvise(req, force_nonblock); |
4840e418 | 6199 | break; |
c1ca757b | 6200 | case IORING_OP_MADVISE: |
014db007 | 6201 | ret = io_madvise(req, force_nonblock); |
c1ca757b | 6202 | break; |
cebdb986 | 6203 | case IORING_OP_OPENAT2: |
014db007 | 6204 | ret = io_openat2(req, force_nonblock); |
cebdb986 | 6205 | break; |
3e4827b0 | 6206 | case IORING_OP_EPOLL_CTL: |
229a7b63 | 6207 | ret = io_epoll_ctl(req, force_nonblock, cs); |
3e4827b0 | 6208 | break; |
7d67af2c | 6209 | case IORING_OP_SPLICE: |
014db007 | 6210 | ret = io_splice(req, force_nonblock); |
7d67af2c | 6211 | break; |
ddf0322d | 6212 | case IORING_OP_PROVIDE_BUFFERS: |
229a7b63 | 6213 | ret = io_provide_buffers(req, force_nonblock, cs); |
ddf0322d | 6214 | break; |
067524e9 | 6215 | case IORING_OP_REMOVE_BUFFERS: |
229a7b63 | 6216 | ret = io_remove_buffers(req, force_nonblock, cs); |
3e4827b0 | 6217 | break; |
f2a8d5c7 | 6218 | case IORING_OP_TEE: |
f2a8d5c7 PB |
6219 | ret = io_tee(req, force_nonblock); |
6220 | break; | |
36f4fa68 JA |
6221 | case IORING_OP_SHUTDOWN: |
6222 | ret = io_shutdown(req, force_nonblock); | |
6223 | break; | |
80a261fd JA |
6224 | case IORING_OP_RENAMEAT: |
6225 | ret = io_renameat(req, force_nonblock); | |
6226 | break; | |
14a1143b JA |
6227 | case IORING_OP_UNLINKAT: |
6228 | ret = io_unlinkat(req, force_nonblock); | |
6229 | break; | |
2b188cc1 JA |
6230 | default: |
6231 | ret = -EINVAL; | |
6232 | break; | |
6233 | } | |
6234 | ||
def596e9 JA |
6235 | if (ret) |
6236 | return ret; | |
6237 | ||
b532576e JA |
6238 | /* If the op doesn't have a file, we're not polling for it */ |
6239 | if ((ctx->flags & IORING_SETUP_IOPOLL) && req->file) { | |
11ba820b JA |
6240 | const bool in_async = io_wq_current_is_worker(); |
6241 | ||
11ba820b JA |
6242 | /* workqueue context doesn't hold uring_lock, grab it now */ |
6243 | if (in_async) | |
6244 | mutex_lock(&ctx->uring_lock); | |
6245 | ||
2e9dbe90 | 6246 | io_iopoll_req_issued(req, in_async); |
11ba820b JA |
6247 | |
6248 | if (in_async) | |
6249 | mutex_unlock(&ctx->uring_lock); | |
def596e9 JA |
6250 | } |
6251 | ||
6252 | return 0; | |
2b188cc1 JA |
6253 | } |
6254 | ||
f4db7182 | 6255 | static struct io_wq_work *io_wq_submit_work(struct io_wq_work *work) |
2b188cc1 JA |
6256 | { |
6257 | struct io_kiocb *req = container_of(work, struct io_kiocb, work); | |
6df1db6b | 6258 | struct io_kiocb *timeout; |
561fb04a | 6259 | int ret = 0; |
2b188cc1 | 6260 | |
6df1db6b PB |
6261 | timeout = io_prep_linked_timeout(req); |
6262 | if (timeout) | |
6263 | io_queue_linked_timeout(timeout); | |
d4c81f38 | 6264 | |
0c9d5ccd JA |
6265 | /* if NO_CANCEL is set, we must still run the work */ |
6266 | if ((work->flags & (IO_WQ_WORK_CANCEL|IO_WQ_WORK_NO_CANCEL)) == | |
6267 | IO_WQ_WORK_CANCEL) { | |
561fb04a | 6268 | ret = -ECANCELED; |
0c9d5ccd | 6269 | } |
31b51510 | 6270 | |
561fb04a | 6271 | if (!ret) { |
561fb04a | 6272 | do { |
c1379e24 | 6273 | ret = io_issue_sqe(req, false, NULL); |
561fb04a JA |
6274 | /* |
6275 | * We can get EAGAIN for polled IO even though we're | |
6276 | * forcing a sync submission from here, since we can't | |
6277 | * wait for request slots on the block side. | |
6278 | */ | |
6279 | if (ret != -EAGAIN) | |
6280 | break; | |
6281 | cond_resched(); | |
6282 | } while (1); | |
6283 | } | |
31b51510 | 6284 | |
561fb04a | 6285 | if (ret) { |
4e88d6e7 | 6286 | req_set_fail_links(req); |
e1e16097 | 6287 | io_req_complete(req, ret); |
edafccee | 6288 | } |
2b188cc1 | 6289 | |
f4db7182 | 6290 | return io_steal_work(req); |
2b188cc1 JA |
6291 | } |
6292 | ||
65e19f54 JA |
6293 | static inline struct file *io_file_from_index(struct io_ring_ctx *ctx, |
6294 | int index) | |
6295 | { | |
6296 | struct fixed_file_table *table; | |
6297 | ||
05f3fb3c | 6298 | table = &ctx->file_data->table[index >> IORING_FILE_TABLE_SHIFT]; |
84695089 | 6299 | return table->files[index & IORING_FILE_TABLE_MASK]; |
65e19f54 JA |
6300 | } |
6301 | ||
8371adf5 PB |
6302 | static struct file *io_file_get(struct io_submit_state *state, |
6303 | struct io_kiocb *req, int fd, bool fixed) | |
09bb8394 | 6304 | { |
a197f664 | 6305 | struct io_ring_ctx *ctx = req->ctx; |
8da11c19 | 6306 | struct file *file; |
09bb8394 | 6307 | |
8da11c19 | 6308 | if (fixed) { |
479f517b | 6309 | if (unlikely((unsigned int)fd >= ctx->nr_user_files)) |
8371adf5 | 6310 | return NULL; |
b7620121 | 6311 | fd = array_index_nospec(fd, ctx->nr_user_files); |
8da11c19 | 6312 | file = io_file_from_index(ctx, fd); |
fd2206e4 | 6313 | if (file) { |
b2e96852 | 6314 | req->fixed_file_refs = &ctx->file_data->node->refs; |
fd2206e4 JA |
6315 | percpu_ref_get(req->fixed_file_refs); |
6316 | } | |
09bb8394 | 6317 | } else { |
c826bd7a | 6318 | trace_io_uring_file_get(ctx, fd); |
8da11c19 | 6319 | file = __io_file_get(state, fd); |
09bb8394 JA |
6320 | } |
6321 | ||
8371adf5 | 6322 | return file; |
09bb8394 JA |
6323 | } |
6324 | ||
8da11c19 | 6325 | static int io_req_set_file(struct io_submit_state *state, struct io_kiocb *req, |
63ff8223 | 6326 | int fd) |
8da11c19 | 6327 | { |
28cea78a | 6328 | req->file = io_file_get(state, req, fd, req->flags & REQ_F_FIXED_FILE); |
8371adf5 | 6329 | if (req->file || io_op_defs[req->opcode].needs_file_no_error) |
f86cd20c | 6330 | return 0; |
8371adf5 | 6331 | return -EBADF; |
f56040b8 PB |
6332 | } |
6333 | ||
2665abfd | 6334 | static enum hrtimer_restart io_link_timeout_fn(struct hrtimer *timer) |
2b188cc1 | 6335 | { |
ad8a48ac JA |
6336 | struct io_timeout_data *data = container_of(timer, |
6337 | struct io_timeout_data, timer); | |
90cd7e42 | 6338 | struct io_kiocb *prev, *req = data->req; |
2665abfd | 6339 | struct io_ring_ctx *ctx = req->ctx; |
2665abfd | 6340 | unsigned long flags; |
2665abfd JA |
6341 | |
6342 | spin_lock_irqsave(&ctx->completion_lock, flags); | |
90cd7e42 PB |
6343 | prev = req->timeout.head; |
6344 | req->timeout.head = NULL; | |
2665abfd JA |
6345 | |
6346 | /* | |
6347 | * We don't expect the list to be empty, that will only happen if we | |
6348 | * race with the completion of the linked work. | |
6349 | */ | |
90cd7e42 | 6350 | if (prev && refcount_inc_not_zero(&prev->refs)) |
f2f87370 | 6351 | io_remove_next_linked(prev); |
90cd7e42 PB |
6352 | else |
6353 | prev = NULL; | |
2665abfd JA |
6354 | spin_unlock_irqrestore(&ctx->completion_lock, flags); |
6355 | ||
6356 | if (prev) { | |
4e88d6e7 | 6357 | req_set_fail_links(prev); |
014db007 | 6358 | io_async_find_and_cancel(ctx, req, prev->user_data, -ETIME); |
76a46e06 | 6359 | io_put_req(prev); |
47f46768 | 6360 | } else { |
e1e16097 | 6361 | io_req_complete(req, -ETIME); |
2665abfd | 6362 | } |
2665abfd JA |
6363 | return HRTIMER_NORESTART; |
6364 | } | |
6365 | ||
7271ef3a | 6366 | static void __io_queue_linked_timeout(struct io_kiocb *req) |
2665abfd | 6367 | { |
76a46e06 | 6368 | /* |
f2f87370 PB |
6369 | * If the back reference is NULL, then our linked request finished |
6370 | * before we got a chance to setup the timer | |
76a46e06 | 6371 | */ |
90cd7e42 | 6372 | if (req->timeout.head) { |
e8c2bc1f | 6373 | struct io_timeout_data *data = req->async_data; |
94ae5e77 | 6374 | |
ad8a48ac JA |
6375 | data->timer.function = io_link_timeout_fn; |
6376 | hrtimer_start(&data->timer, timespec64_to_ktime(data->ts), | |
6377 | data->mode); | |
2665abfd | 6378 | } |
7271ef3a JA |
6379 | } |
6380 | ||
6381 | static void io_queue_linked_timeout(struct io_kiocb *req) | |
6382 | { | |
6383 | struct io_ring_ctx *ctx = req->ctx; | |
6384 | ||
6385 | spin_lock_irq(&ctx->completion_lock); | |
6386 | __io_queue_linked_timeout(req); | |
76a46e06 | 6387 | spin_unlock_irq(&ctx->completion_lock); |
2665abfd | 6388 | |
2665abfd | 6389 | /* drop submission reference */ |
76a46e06 JA |
6390 | io_put_req(req); |
6391 | } | |
2665abfd | 6392 | |
ad8a48ac | 6393 | static struct io_kiocb *io_prep_linked_timeout(struct io_kiocb *req) |
2665abfd | 6394 | { |
f2f87370 | 6395 | struct io_kiocb *nxt = req->link; |
2665abfd | 6396 | |
f2f87370 PB |
6397 | if (!nxt || (req->flags & REQ_F_LINK_TIMEOUT) || |
6398 | nxt->opcode != IORING_OP_LINK_TIMEOUT) | |
76a46e06 | 6399 | return NULL; |
2665abfd | 6400 | |
90cd7e42 | 6401 | nxt->timeout.head = req; |
900fad45 | 6402 | nxt->flags |= REQ_F_LTIMEOUT_ACTIVE; |
76a46e06 | 6403 | req->flags |= REQ_F_LINK_TIMEOUT; |
76a46e06 | 6404 | return nxt; |
2665abfd JA |
6405 | } |
6406 | ||
c1379e24 | 6407 | static void __io_queue_sqe(struct io_kiocb *req, struct io_comp_state *cs) |
2b188cc1 | 6408 | { |
4a0a7a18 | 6409 | struct io_kiocb *linked_timeout; |
193155c8 | 6410 | const struct cred *old_creds = NULL; |
e0c5c576 | 6411 | int ret; |
2b188cc1 | 6412 | |
4a0a7a18 JA |
6413 | again: |
6414 | linked_timeout = io_prep_linked_timeout(req); | |
6415 | ||
2e5aa6cb PB |
6416 | if ((req->flags & REQ_F_WORK_INITIALIZED) && |
6417 | (req->work.flags & IO_WQ_WORK_CREDS) && | |
98447d65 | 6418 | req->work.identity->creds != current_cred()) { |
193155c8 JA |
6419 | if (old_creds) |
6420 | revert_creds(old_creds); | |
98447d65 | 6421 | if (old_creds == req->work.identity->creds) |
193155c8 JA |
6422 | old_creds = NULL; /* restored original creds */ |
6423 | else | |
98447d65 | 6424 | old_creds = override_creds(req->work.identity->creds); |
193155c8 JA |
6425 | } |
6426 | ||
c1379e24 | 6427 | ret = io_issue_sqe(req, true, cs); |
491381ce JA |
6428 | |
6429 | /* | |
6430 | * We async punt it if the file wasn't marked NOWAIT, or if the file | |
6431 | * doesn't support non-blocking read/write attempts | |
6432 | */ | |
24c74678 | 6433 | if (ret == -EAGAIN && !(req->flags & REQ_F_NOWAIT)) { |
f063c547 | 6434 | if (!io_arm_poll_handler(req)) { |
f063c547 PB |
6435 | /* |
6436 | * Queued up for async execution, worker will release | |
6437 | * submit reference when the iocb is actually submitted. | |
6438 | */ | |
6439 | io_queue_async_work(req); | |
2b188cc1 | 6440 | } |
bbad27b2 | 6441 | |
f063c547 PB |
6442 | if (linked_timeout) |
6443 | io_queue_linked_timeout(linked_timeout); | |
0d63c148 PB |
6444 | } else if (likely(!ret)) { |
6445 | /* drop submission reference */ | |
6446 | req = io_put_req_find_next(req); | |
6447 | if (linked_timeout) | |
6448 | io_queue_linked_timeout(linked_timeout); | |
e65ef56d | 6449 | |
0d63c148 PB |
6450 | if (req) { |
6451 | if (!(req->flags & REQ_F_FORCE_ASYNC)) | |
6452 | goto again; | |
6453 | io_queue_async_work(req); | |
6454 | } | |
6455 | } else { | |
652532ad PB |
6456 | /* un-prep timeout, so it'll be killed as any other linked */ |
6457 | req->flags &= ~REQ_F_LINK_TIMEOUT; | |
4e88d6e7 | 6458 | req_set_fail_links(req); |
e65ef56d | 6459 | io_put_req(req); |
e1e16097 | 6460 | io_req_complete(req, ret); |
9e645e11 | 6461 | } |
652532ad | 6462 | |
193155c8 JA |
6463 | if (old_creds) |
6464 | revert_creds(old_creds); | |
2b188cc1 JA |
6465 | } |
6466 | ||
f13fad7b JA |
6467 | static void io_queue_sqe(struct io_kiocb *req, const struct io_uring_sqe *sqe, |
6468 | struct io_comp_state *cs) | |
4fe2c963 JL |
6469 | { |
6470 | int ret; | |
6471 | ||
3529d8c2 | 6472 | ret = io_req_defer(req, sqe); |
4fe2c963 JL |
6473 | if (ret) { |
6474 | if (ret != -EIOCBQUEUED) { | |
1118591a | 6475 | fail_req: |
4e88d6e7 | 6476 | req_set_fail_links(req); |
e1e16097 JA |
6477 | io_put_req(req); |
6478 | io_req_complete(req, ret); | |
4fe2c963 | 6479 | } |
2550878f | 6480 | } else if (req->flags & REQ_F_FORCE_ASYNC) { |
e8c2bc1f | 6481 | if (!req->async_data) { |
bd2ab18a | 6482 | ret = io_req_defer_prep(req, sqe); |
327d6d96 | 6483 | if (unlikely(ret)) |
bd2ab18a PB |
6484 | goto fail_req; |
6485 | } | |
ce35a47a JA |
6486 | io_queue_async_work(req); |
6487 | } else { | |
c1379e24 PB |
6488 | if (sqe) { |
6489 | ret = io_req_prep(req, sqe); | |
6490 | if (unlikely(ret)) | |
6491 | goto fail_req; | |
6492 | } | |
6493 | __io_queue_sqe(req, cs); | |
ce35a47a | 6494 | } |
4fe2c963 JL |
6495 | } |
6496 | ||
f13fad7b JA |
6497 | static inline void io_queue_link_head(struct io_kiocb *req, |
6498 | struct io_comp_state *cs) | |
4fe2c963 | 6499 | { |
94ae5e77 | 6500 | if (unlikely(req->flags & REQ_F_FAIL_LINK)) { |
e1e16097 JA |
6501 | io_put_req(req); |
6502 | io_req_complete(req, -ECANCELED); | |
1b4a51b6 | 6503 | } else |
f13fad7b | 6504 | io_queue_sqe(req, NULL, cs); |
4fe2c963 JL |
6505 | } |
6506 | ||
863e0560 PB |
6507 | struct io_submit_link { |
6508 | struct io_kiocb *head; | |
6509 | struct io_kiocb *last; | |
6510 | }; | |
6511 | ||
1d4240cc | 6512 | static int io_submit_sqe(struct io_kiocb *req, const struct io_uring_sqe *sqe, |
863e0560 | 6513 | struct io_submit_link *link, struct io_comp_state *cs) |
9e645e11 | 6514 | { |
a197f664 | 6515 | struct io_ring_ctx *ctx = req->ctx; |
ef4ff581 | 6516 | int ret; |
9e645e11 | 6517 | |
9e645e11 JA |
6518 | /* |
6519 | * If we already have a head request, queue this one for async | |
6520 | * submittal once the head completes. If we don't have a head but | |
6521 | * IOSQE_IO_LINK is set in the sqe, start a new head. This one will be | |
6522 | * submitted sync once the chain is complete. If none of those | |
6523 | * conditions are true (normal request), then just queue it. | |
6524 | */ | |
863e0560 PB |
6525 | if (link->head) { |
6526 | struct io_kiocb *head = link->head; | |
4e88d6e7 | 6527 | |
8cdf2193 PB |
6528 | /* |
6529 | * Taking sequential execution of a link, draining both sides | |
6530 | * of the link also fullfils IOSQE_IO_DRAIN semantics for all | |
6531 | * requests in the link. So, it drains the head and the | |
6532 | * next after the link request. The last one is done via | |
6533 | * drain_next flag to persist the effect across calls. | |
6534 | */ | |
ef4ff581 | 6535 | if (req->flags & REQ_F_IO_DRAIN) { |
711be031 PB |
6536 | head->flags |= REQ_F_IO_DRAIN; |
6537 | ctx->drain_next = 1; | |
6538 | } | |
3529d8c2 | 6539 | ret = io_req_defer_prep(req, sqe); |
327d6d96 | 6540 | if (unlikely(ret)) { |
4e88d6e7 | 6541 | /* fail even hard links since we don't submit */ |
9d76377f | 6542 | head->flags |= REQ_F_FAIL_LINK; |
1d4240cc | 6543 | return ret; |
2d28390a | 6544 | } |
9d76377f | 6545 | trace_io_uring_link(ctx, req, head); |
f2f87370 | 6546 | link->last->link = req; |
863e0560 | 6547 | link->last = req; |
32fe525b PB |
6548 | |
6549 | /* last request of a link, enqueue the link */ | |
ef4ff581 | 6550 | if (!(req->flags & (REQ_F_LINK | REQ_F_HARDLINK))) { |
f13fad7b | 6551 | io_queue_link_head(head, cs); |
863e0560 | 6552 | link->head = NULL; |
32fe525b | 6553 | } |
9e645e11 | 6554 | } else { |
711be031 PB |
6555 | if (unlikely(ctx->drain_next)) { |
6556 | req->flags |= REQ_F_IO_DRAIN; | |
ef4ff581 | 6557 | ctx->drain_next = 0; |
711be031 | 6558 | } |
ef4ff581 | 6559 | if (req->flags & (REQ_F_LINK | REQ_F_HARDLINK)) { |
711be031 | 6560 | ret = io_req_defer_prep(req, sqe); |
327d6d96 | 6561 | if (unlikely(ret)) |
711be031 | 6562 | req->flags |= REQ_F_FAIL_LINK; |
863e0560 PB |
6563 | link->head = req; |
6564 | link->last = req; | |
711be031 | 6565 | } else { |
f13fad7b | 6566 | io_queue_sqe(req, sqe, cs); |
711be031 | 6567 | } |
9e645e11 | 6568 | } |
2e6e1fde | 6569 | |
1d4240cc | 6570 | return 0; |
9e645e11 JA |
6571 | } |
6572 | ||
9a56a232 JA |
6573 | /* |
6574 | * Batched submission is done, ensure local IO is flushed out. | |
6575 | */ | |
6576 | static void io_submit_state_end(struct io_submit_state *state) | |
6577 | { | |
f13fad7b JA |
6578 | if (!list_empty(&state->comp.list)) |
6579 | io_submit_flush_completions(&state->comp); | |
27926b68 JA |
6580 | if (state->plug_started) |
6581 | blk_finish_plug(&state->plug); | |
9f13c35b | 6582 | io_state_file_put(state); |
2579f913 | 6583 | if (state->free_reqs) |
6c8a3134 | 6584 | kmem_cache_free_bulk(req_cachep, state->free_reqs, state->reqs); |
9a56a232 JA |
6585 | } |
6586 | ||
6587 | /* | |
6588 | * Start submission side cache. | |
6589 | */ | |
6590 | static void io_submit_state_start(struct io_submit_state *state, | |
013538bd | 6591 | struct io_ring_ctx *ctx, unsigned int max_ios) |
9a56a232 | 6592 | { |
27926b68 | 6593 | state->plug_started = false; |
013538bd JA |
6594 | state->comp.nr = 0; |
6595 | INIT_LIST_HEAD(&state->comp.list); | |
6596 | state->comp.ctx = ctx; | |
2579f913 | 6597 | state->free_reqs = 0; |
9a56a232 JA |
6598 | state->file = NULL; |
6599 | state->ios_left = max_ios; | |
6600 | } | |
6601 | ||
2b188cc1 JA |
6602 | static void io_commit_sqring(struct io_ring_ctx *ctx) |
6603 | { | |
75b28aff | 6604 | struct io_rings *rings = ctx->rings; |
2b188cc1 | 6605 | |
caf582c6 PB |
6606 | /* |
6607 | * Ensure any loads from the SQEs are done at this point, | |
6608 | * since once we write the new head, the application could | |
6609 | * write new data to them. | |
6610 | */ | |
6611 | smp_store_release(&rings->sq.head, ctx->cached_sq_head); | |
2b188cc1 JA |
6612 | } |
6613 | ||
2b188cc1 | 6614 | /* |
3529d8c2 | 6615 | * Fetch an sqe, if one is available. Note that sqe_ptr will point to memory |
2b188cc1 JA |
6616 | * that is mapped by userspace. This means that care needs to be taken to |
6617 | * ensure that reads are stable, as we cannot rely on userspace always | |
6618 | * being a good citizen. If members of the sqe are validated and then later | |
6619 | * used, it's important that those reads are done through READ_ONCE() to | |
6620 | * prevent a re-load down the line. | |
6621 | */ | |
709b302f | 6622 | static const struct io_uring_sqe *io_get_sqe(struct io_ring_ctx *ctx) |
2b188cc1 | 6623 | { |
75b28aff | 6624 | u32 *sq_array = ctx->sq_array; |
2b188cc1 JA |
6625 | unsigned head; |
6626 | ||
6627 | /* | |
6628 | * The cached sq head (or cq tail) serves two purposes: | |
6629 | * | |
6630 | * 1) allows us to batch the cost of updating the user visible | |
6631 | * head updates. | |
6632 | * 2) allows the kernel side to track the head on its own, even | |
6633 | * though the application is the one updating it. | |
6634 | */ | |
ee7d46d9 | 6635 | head = READ_ONCE(sq_array[ctx->cached_sq_head & ctx->sq_mask]); |
709b302f PB |
6636 | if (likely(head < ctx->sq_entries)) |
6637 | return &ctx->sq_sqes[head]; | |
2b188cc1 JA |
6638 | |
6639 | /* drop invalid entries */ | |
498ccd9e | 6640 | ctx->cached_sq_dropped++; |
ee7d46d9 | 6641 | WRITE_ONCE(ctx->rings->sq_dropped, ctx->cached_sq_dropped); |
709b302f PB |
6642 | return NULL; |
6643 | } | |
6644 | ||
6645 | static inline void io_consume_sqe(struct io_ring_ctx *ctx) | |
6646 | { | |
6647 | ctx->cached_sq_head++; | |
2b188cc1 JA |
6648 | } |
6649 | ||
21b55dbc SG |
6650 | /* |
6651 | * Check SQE restrictions (opcode and flags). | |
6652 | * | |
6653 | * Returns 'true' if SQE is allowed, 'false' otherwise. | |
6654 | */ | |
6655 | static inline bool io_check_restriction(struct io_ring_ctx *ctx, | |
6656 | struct io_kiocb *req, | |
6657 | unsigned int sqe_flags) | |
6658 | { | |
6659 | if (!ctx->restricted) | |
6660 | return true; | |
6661 | ||
6662 | if (!test_bit(req->opcode, ctx->restrictions.sqe_op)) | |
6663 | return false; | |
6664 | ||
6665 | if ((sqe_flags & ctx->restrictions.sqe_flags_required) != | |
6666 | ctx->restrictions.sqe_flags_required) | |
6667 | return false; | |
6668 | ||
6669 | if (sqe_flags & ~(ctx->restrictions.sqe_flags_allowed | | |
6670 | ctx->restrictions.sqe_flags_required)) | |
6671 | return false; | |
6672 | ||
6673 | return true; | |
6674 | } | |
6675 | ||
ef4ff581 PB |
6676 | #define SQE_VALID_FLAGS (IOSQE_FIXED_FILE|IOSQE_IO_DRAIN|IOSQE_IO_LINK| \ |
6677 | IOSQE_IO_HARDLINK | IOSQE_ASYNC | \ | |
6678 | IOSQE_BUFFER_SELECT) | |
6679 | ||
6680 | static int io_init_req(struct io_ring_ctx *ctx, struct io_kiocb *req, | |
6681 | const struct io_uring_sqe *sqe, | |
0cdaf760 | 6682 | struct io_submit_state *state) |
0553b8bd | 6683 | { |
ef4ff581 | 6684 | unsigned int sqe_flags; |
71b547c0 | 6685 | int id, ret; |
ef4ff581 | 6686 | |
0553b8bd PB |
6687 | req->opcode = READ_ONCE(sqe->opcode); |
6688 | req->user_data = READ_ONCE(sqe->user_data); | |
e8c2bc1f | 6689 | req->async_data = NULL; |
0553b8bd PB |
6690 | req->file = NULL; |
6691 | req->ctx = ctx; | |
6692 | req->flags = 0; | |
f2f87370 | 6693 | req->link = NULL; |
0553b8bd PB |
6694 | /* one is dropped after submission, the other at completion */ |
6695 | refcount_set(&req->refs, 2); | |
4dd2824d | 6696 | req->task = current; |
0553b8bd | 6697 | req->result = 0; |
ef4ff581 PB |
6698 | |
6699 | if (unlikely(req->opcode >= IORING_OP_LAST)) | |
6700 | return -EINVAL; | |
6701 | ||
28cea78a | 6702 | if (unlikely(io_sq_thread_acquire_mm_files(ctx, req))) |
9d8426a0 | 6703 | return -EFAULT; |
ef4ff581 PB |
6704 | |
6705 | sqe_flags = READ_ONCE(sqe->flags); | |
6706 | /* enforce forwards compatibility on users */ | |
6707 | if (unlikely(sqe_flags & ~SQE_VALID_FLAGS)) | |
6708 | return -EINVAL; | |
6709 | ||
21b55dbc SG |
6710 | if (unlikely(!io_check_restriction(ctx, req, sqe_flags))) |
6711 | return -EACCES; | |
6712 | ||
ef4ff581 PB |
6713 | if ((sqe_flags & IOSQE_BUFFER_SELECT) && |
6714 | !io_op_defs[req->opcode].buffer_select) | |
6715 | return -EOPNOTSUPP; | |
6716 | ||
6717 | id = READ_ONCE(sqe->personality); | |
6718 | if (id) { | |
1e6fa521 JA |
6719 | struct io_identity *iod; |
6720 | ||
1e6fa521 JA |
6721 | iod = idr_find(&ctx->personality_idr, id); |
6722 | if (unlikely(!iod)) | |
ef4ff581 | 6723 | return -EINVAL; |
1e6fa521 | 6724 | refcount_inc(&iod->count); |
ec99ca6c PB |
6725 | |
6726 | __io_req_init_async(req); | |
1e6fa521 JA |
6727 | get_cred(iod->creds); |
6728 | req->work.identity = iod; | |
dfead8a8 | 6729 | req->work.flags |= IO_WQ_WORK_CREDS; |
ef4ff581 PB |
6730 | } |
6731 | ||
6732 | /* same numerical values with corresponding REQ_F_*, safe to copy */ | |
c11368a5 | 6733 | req->flags |= sqe_flags; |
ef4ff581 | 6734 | |
27926b68 JA |
6735 | /* |
6736 | * Plug now if we have more than 1 IO left after this, and the target | |
6737 | * is potentially a read/write to block based storage. | |
6738 | */ | |
6739 | if (!state->plug_started && state->ios_left > 1 && | |
6740 | io_op_defs[req->opcode].plug) { | |
6741 | blk_start_plug(&state->plug); | |
6742 | state->plug_started = true; | |
6743 | } | |
6744 | ||
63ff8223 JA |
6745 | if (!io_op_defs[req->opcode].needs_file) |
6746 | return 0; | |
6747 | ||
71b547c0 PB |
6748 | ret = io_req_set_file(state, req, READ_ONCE(sqe->fd)); |
6749 | state->ios_left--; | |
6750 | return ret; | |
0553b8bd PB |
6751 | } |
6752 | ||
0f212204 | 6753 | static int io_submit_sqes(struct io_ring_ctx *ctx, unsigned int nr) |
6c271ce2 | 6754 | { |
ac8691c4 | 6755 | struct io_submit_state state; |
863e0560 | 6756 | struct io_submit_link link; |
9e645e11 | 6757 | int i, submitted = 0; |
6c271ce2 | 6758 | |
c4a2ed72 | 6759 | /* if we have a backlog and couldn't flush it all, return BUSY */ |
ad3eb2c8 JA |
6760 | if (test_bit(0, &ctx->sq_check_overflow)) { |
6761 | if (!list_empty(&ctx->cq_overflow_list) && | |
e6c8aa9a | 6762 | !io_cqring_overflow_flush(ctx, false, NULL, NULL)) |
ad3eb2c8 JA |
6763 | return -EBUSY; |
6764 | } | |
6c271ce2 | 6765 | |
ee7d46d9 PB |
6766 | /* make sure SQ entry isn't read before tail */ |
6767 | nr = min3(nr, ctx->sq_entries, io_sqring_entries(ctx)); | |
9ef4f124 | 6768 | |
2b85edfc PB |
6769 | if (!percpu_ref_tryget_many(&ctx->refs, nr)) |
6770 | return -EAGAIN; | |
6c271ce2 | 6771 | |
d8a6df10 | 6772 | percpu_counter_add(¤t->io_uring->inflight, nr); |
faf7b51c | 6773 | refcount_add(nr, ¤t->usage); |
6c271ce2 | 6774 | |
013538bd | 6775 | io_submit_state_start(&state, ctx, nr); |
863e0560 | 6776 | link.head = NULL; |
b14cca0c | 6777 | |
6c271ce2 | 6778 | for (i = 0; i < nr; i++) { |
3529d8c2 | 6779 | const struct io_uring_sqe *sqe; |
196be95c | 6780 | struct io_kiocb *req; |
1cb1edb2 | 6781 | int err; |
fb5ccc98 | 6782 | |
b1e50e54 PB |
6783 | sqe = io_get_sqe(ctx); |
6784 | if (unlikely(!sqe)) { | |
6785 | io_consume_sqe(ctx); | |
6786 | break; | |
6787 | } | |
ac8691c4 | 6788 | req = io_alloc_req(ctx, &state); |
196be95c PB |
6789 | if (unlikely(!req)) { |
6790 | if (!submitted) | |
6791 | submitted = -EAGAIN; | |
fb5ccc98 | 6792 | break; |
196be95c | 6793 | } |
709b302f | 6794 | io_consume_sqe(ctx); |
d3656344 JA |
6795 | /* will complete beyond this point, count as submitted */ |
6796 | submitted++; | |
6797 | ||
692d8363 | 6798 | err = io_init_req(ctx, req, sqe, &state); |
ef4ff581 | 6799 | if (unlikely(err)) { |
1cb1edb2 | 6800 | fail_req: |
e1e16097 JA |
6801 | io_put_req(req); |
6802 | io_req_complete(req, err); | |
196be95c PB |
6803 | break; |
6804 | } | |
fb5ccc98 | 6805 | |
354420f7 | 6806 | trace_io_uring_submit_sqe(ctx, req->opcode, req->user_data, |
0cdaf760 | 6807 | true, io_async_submit(ctx)); |
f13fad7b | 6808 | err = io_submit_sqe(req, sqe, &link, &state.comp); |
1d4240cc PB |
6809 | if (err) |
6810 | goto fail_req; | |
6c271ce2 JA |
6811 | } |
6812 | ||
9466f437 PB |
6813 | if (unlikely(submitted != nr)) { |
6814 | int ref_used = (submitted == -EAGAIN) ? 0 : submitted; | |
d8a6df10 JA |
6815 | struct io_uring_task *tctx = current->io_uring; |
6816 | int unused = nr - ref_used; | |
9466f437 | 6817 | |
d8a6df10 JA |
6818 | percpu_ref_put_many(&ctx->refs, unused); |
6819 | percpu_counter_sub(&tctx->inflight, unused); | |
6820 | put_task_struct_many(current, unused); | |
9466f437 | 6821 | } |
863e0560 PB |
6822 | if (link.head) |
6823 | io_queue_link_head(link.head, &state.comp); | |
ac8691c4 | 6824 | io_submit_state_end(&state); |
6c271ce2 | 6825 | |
ae9428ca PB |
6826 | /* Commit SQ ring head once we've consumed and submitted all SQEs */ |
6827 | io_commit_sqring(ctx); | |
6828 | ||
6c271ce2 JA |
6829 | return submitted; |
6830 | } | |
6831 | ||
23b3628e XW |
6832 | static inline void io_ring_set_wakeup_flag(struct io_ring_ctx *ctx) |
6833 | { | |
6834 | /* Tell userspace we may need a wakeup call */ | |
6835 | spin_lock_irq(&ctx->completion_lock); | |
6836 | ctx->rings->sq_flags |= IORING_SQ_NEED_WAKEUP; | |
6837 | spin_unlock_irq(&ctx->completion_lock); | |
6838 | } | |
6839 | ||
6840 | static inline void io_ring_clear_wakeup_flag(struct io_ring_ctx *ctx) | |
6841 | { | |
6842 | spin_lock_irq(&ctx->completion_lock); | |
6843 | ctx->rings->sq_flags &= ~IORING_SQ_NEED_WAKEUP; | |
6844 | spin_unlock_irq(&ctx->completion_lock); | |
6845 | } | |
6846 | ||
08369246 | 6847 | static int __io_sq_thread(struct io_ring_ctx *ctx, bool cap_entries) |
6c271ce2 | 6848 | { |
c8d1ba58 | 6849 | unsigned int to_submit; |
bdcd3eab | 6850 | int ret = 0; |
6c271ce2 | 6851 | |
c8d1ba58 | 6852 | to_submit = io_sqring_entries(ctx); |
e95eee2d JA |
6853 | /* if we're handling multiple rings, cap submit size for fairness */ |
6854 | if (cap_entries && to_submit > 8) | |
6855 | to_submit = 8; | |
6856 | ||
906a3c6f XW |
6857 | if (!list_empty(&ctx->iopoll_list) || to_submit) { |
6858 | unsigned nr_events = 0; | |
6859 | ||
08369246 | 6860 | mutex_lock(&ctx->uring_lock); |
906a3c6f XW |
6861 | if (!list_empty(&ctx->iopoll_list)) |
6862 | io_do_iopoll(ctx, &nr_events, 0); | |
6863 | ||
6864 | if (to_submit && likely(!percpu_ref_is_dying(&ctx->refs))) | |
08369246 XW |
6865 | ret = io_submit_sqes(ctx, to_submit); |
6866 | mutex_unlock(&ctx->uring_lock); | |
6867 | } | |
90554200 JA |
6868 | |
6869 | if (!io_sqring_full(ctx) && wq_has_sleeper(&ctx->sqo_sq_wait)) | |
6870 | wake_up(&ctx->sqo_sq_wait); | |
6871 | ||
08369246 XW |
6872 | return ret; |
6873 | } | |
6874 | ||
6875 | static void io_sqd_update_thread_idle(struct io_sq_data *sqd) | |
6876 | { | |
6877 | struct io_ring_ctx *ctx; | |
6878 | unsigned sq_thread_idle = 0; | |
6879 | ||
6880 | list_for_each_entry(ctx, &sqd->ctx_list, sqd_list) { | |
6881 | if (sq_thread_idle < ctx->sq_thread_idle) | |
6882 | sq_thread_idle = ctx->sq_thread_idle; | |
6883 | } | |
6884 | ||
6885 | sqd->sq_thread_idle = sq_thread_idle; | |
c8d1ba58 | 6886 | } |
6c271ce2 | 6887 | |
69fb2131 JA |
6888 | static void io_sqd_init_new(struct io_sq_data *sqd) |
6889 | { | |
6890 | struct io_ring_ctx *ctx; | |
6891 | ||
6892 | while (!list_empty(&sqd->ctx_new_list)) { | |
6893 | ctx = list_first_entry(&sqd->ctx_new_list, struct io_ring_ctx, sqd_list); | |
69fb2131 JA |
6894 | list_move_tail(&ctx->sqd_list, &sqd->ctx_list); |
6895 | complete(&ctx->sq_thread_comp); | |
6896 | } | |
08369246 XW |
6897 | |
6898 | io_sqd_update_thread_idle(sqd); | |
69fb2131 JA |
6899 | } |
6900 | ||
c8d1ba58 JA |
6901 | static int io_sq_thread(void *data) |
6902 | { | |
91d8f519 | 6903 | struct cgroup_subsys_state *cur_css = NULL; |
28cea78a JA |
6904 | struct files_struct *old_files = current->files; |
6905 | struct nsproxy *old_nsproxy = current->nsproxy; | |
69fb2131 JA |
6906 | const struct cred *old_cred = NULL; |
6907 | struct io_sq_data *sqd = data; | |
6908 | struct io_ring_ctx *ctx; | |
a0d9205f | 6909 | unsigned long timeout = 0; |
08369246 | 6910 | DEFINE_WAIT(wait); |
6c271ce2 | 6911 | |
28cea78a JA |
6912 | task_lock(current); |
6913 | current->files = NULL; | |
6914 | current->nsproxy = NULL; | |
6915 | task_unlock(current); | |
6916 | ||
69fb2131 | 6917 | while (!kthread_should_stop()) { |
08369246 XW |
6918 | int ret; |
6919 | bool cap_entries, sqt_spin, needs_sched; | |
c1edbf5f JA |
6920 | |
6921 | /* | |
69fb2131 JA |
6922 | * Any changes to the sqd lists are synchronized through the |
6923 | * kthread parking. This synchronizes the thread vs users, | |
6924 | * the users are synchronized on the sqd->ctx_lock. | |
c1edbf5f | 6925 | */ |
69fb2131 JA |
6926 | if (kthread_should_park()) |
6927 | kthread_parkme(); | |
7143b5ac | 6928 | |
08369246 | 6929 | if (unlikely(!list_empty(&sqd->ctx_new_list))) { |
69fb2131 | 6930 | io_sqd_init_new(sqd); |
08369246 XW |
6931 | timeout = jiffies + sqd->sq_thread_idle; |
6932 | } | |
6c271ce2 | 6933 | |
08369246 | 6934 | sqt_spin = false; |
e95eee2d | 6935 | cap_entries = !list_is_singular(&sqd->ctx_list); |
69fb2131 JA |
6936 | list_for_each_entry(ctx, &sqd->ctx_list, sqd_list) { |
6937 | if (current->cred != ctx->creds) { | |
6938 | if (old_cred) | |
6939 | revert_creds(old_cred); | |
6940 | old_cred = override_creds(ctx->creds); | |
bdcd3eab | 6941 | } |
91d8f519 | 6942 | io_sq_thread_associate_blkcg(ctx, &cur_css); |
4ea33a97 JA |
6943 | #ifdef CONFIG_AUDIT |
6944 | current->loginuid = ctx->loginuid; | |
6945 | current->sessionid = ctx->sessionid; | |
6946 | #endif | |
bdcd3eab | 6947 | |
08369246 XW |
6948 | ret = __io_sq_thread(ctx, cap_entries); |
6949 | if (!sqt_spin && (ret > 0 || !list_empty(&ctx->iopoll_list))) | |
6950 | sqt_spin = true; | |
6c271ce2 | 6951 | |
28cea78a | 6952 | io_sq_thread_drop_mm_files(); |
69fb2131 | 6953 | } |
6c271ce2 | 6954 | |
08369246 | 6955 | if (sqt_spin || !time_after(jiffies, timeout)) { |
c8d1ba58 JA |
6956 | io_run_task_work(); |
6957 | cond_resched(); | |
08369246 XW |
6958 | if (sqt_spin) |
6959 | timeout = jiffies + sqd->sq_thread_idle; | |
6960 | continue; | |
6961 | } | |
6962 | ||
6963 | if (kthread_should_park()) | |
6964 | continue; | |
6965 | ||
6966 | needs_sched = true; | |
6967 | prepare_to_wait(&sqd->wait, &wait, TASK_INTERRUPTIBLE); | |
6968 | list_for_each_entry(ctx, &sqd->ctx_list, sqd_list) { | |
6969 | if ((ctx->flags & IORING_SETUP_IOPOLL) && | |
6970 | !list_empty_careful(&ctx->iopoll_list)) { | |
6971 | needs_sched = false; | |
6972 | break; | |
6973 | } | |
6974 | if (io_sqring_entries(ctx)) { | |
6975 | needs_sched = false; | |
6976 | break; | |
6977 | } | |
6978 | } | |
6979 | ||
6980 | if (needs_sched) { | |
69fb2131 JA |
6981 | list_for_each_entry(ctx, &sqd->ctx_list, sqd_list) |
6982 | io_ring_set_wakeup_flag(ctx); | |
08369246 | 6983 | |
69fb2131 | 6984 | schedule(); |
69fb2131 JA |
6985 | list_for_each_entry(ctx, &sqd->ctx_list, sqd_list) |
6986 | io_ring_clear_wakeup_flag(ctx); | |
6c271ce2 | 6987 | } |
08369246 XW |
6988 | |
6989 | finish_wait(&sqd->wait, &wait); | |
6990 | timeout = jiffies + sqd->sq_thread_idle; | |
6c271ce2 JA |
6991 | } |
6992 | ||
4c6e277c | 6993 | io_run_task_work(); |
b41e9852 | 6994 | |
91d8f519 DZ |
6995 | if (cur_css) |
6996 | io_sq_thread_unassociate_blkcg(); | |
69fb2131 JA |
6997 | if (old_cred) |
6998 | revert_creds(old_cred); | |
06058632 | 6999 | |
28cea78a JA |
7000 | task_lock(current); |
7001 | current->files = old_files; | |
7002 | current->nsproxy = old_nsproxy; | |
7003 | task_unlock(current); | |
7004 | ||
2bbcd6d3 | 7005 | kthread_parkme(); |
06058632 | 7006 | |
6c271ce2 JA |
7007 | return 0; |
7008 | } | |
7009 | ||
bda52162 JA |
7010 | struct io_wait_queue { |
7011 | struct wait_queue_entry wq; | |
7012 | struct io_ring_ctx *ctx; | |
7013 | unsigned to_wait; | |
7014 | unsigned nr_timeouts; | |
7015 | }; | |
7016 | ||
1d7bb1d5 | 7017 | static inline bool io_should_wake(struct io_wait_queue *iowq, bool noflush) |
bda52162 JA |
7018 | { |
7019 | struct io_ring_ctx *ctx = iowq->ctx; | |
7020 | ||
7021 | /* | |
d195a66e | 7022 | * Wake up if we have enough events, or if a timeout occurred since we |
bda52162 JA |
7023 | * started waiting. For timeouts, we always want to return to userspace, |
7024 | * regardless of event count. | |
7025 | */ | |
1d7bb1d5 | 7026 | return io_cqring_events(ctx, noflush) >= iowq->to_wait || |
bda52162 JA |
7027 | atomic_read(&ctx->cq_timeouts) != iowq->nr_timeouts; |
7028 | } | |
7029 | ||
7030 | static int io_wake_function(struct wait_queue_entry *curr, unsigned int mode, | |
7031 | int wake_flags, void *key) | |
7032 | { | |
7033 | struct io_wait_queue *iowq = container_of(curr, struct io_wait_queue, | |
7034 | wq); | |
7035 | ||
1d7bb1d5 JA |
7036 | /* use noflush == true, as we can't safely rely on locking context */ |
7037 | if (!io_should_wake(iowq, true)) | |
bda52162 JA |
7038 | return -1; |
7039 | ||
7040 | return autoremove_wake_function(curr, mode, wake_flags, key); | |
7041 | } | |
7042 | ||
af9c1a44 JA |
7043 | static int io_run_task_work_sig(void) |
7044 | { | |
7045 | if (io_run_task_work()) | |
7046 | return 1; | |
7047 | if (!signal_pending(current)) | |
7048 | return 0; | |
7049 | if (current->jobctl & JOBCTL_TASK_WORK) { | |
7050 | spin_lock_irq(¤t->sighand->siglock); | |
7051 | current->jobctl &= ~JOBCTL_TASK_WORK; | |
7052 | recalc_sigpending(); | |
7053 | spin_unlock_irq(¤t->sighand->siglock); | |
7054 | return 1; | |
7055 | } | |
7056 | return -EINTR; | |
7057 | } | |
7058 | ||
2b188cc1 JA |
7059 | /* |
7060 | * Wait until events become available, if we don't already have some. The | |
7061 | * application must reap them itself, as they reside on the shared cq ring. | |
7062 | */ | |
7063 | static int io_cqring_wait(struct io_ring_ctx *ctx, int min_events, | |
c73ebb68 HX |
7064 | const sigset_t __user *sig, size_t sigsz, |
7065 | struct __kernel_timespec __user *uts) | |
2b188cc1 | 7066 | { |
bda52162 JA |
7067 | struct io_wait_queue iowq = { |
7068 | .wq = { | |
7069 | .private = current, | |
7070 | .func = io_wake_function, | |
7071 | .entry = LIST_HEAD_INIT(iowq.wq.entry), | |
7072 | }, | |
7073 | .ctx = ctx, | |
7074 | .to_wait = min_events, | |
7075 | }; | |
75b28aff | 7076 | struct io_rings *rings = ctx->rings; |
c73ebb68 HX |
7077 | struct timespec64 ts; |
7078 | signed long timeout = 0; | |
e9ffa5c2 | 7079 | int ret = 0; |
2b188cc1 | 7080 | |
b41e9852 JA |
7081 | do { |
7082 | if (io_cqring_events(ctx, false) >= min_events) | |
7083 | return 0; | |
4c6e277c | 7084 | if (!io_run_task_work()) |
b41e9852 | 7085 | break; |
b41e9852 | 7086 | } while (1); |
2b188cc1 JA |
7087 | |
7088 | if (sig) { | |
9e75ad5d AB |
7089 | #ifdef CONFIG_COMPAT |
7090 | if (in_compat_syscall()) | |
7091 | ret = set_compat_user_sigmask((const compat_sigset_t __user *)sig, | |
b772434b | 7092 | sigsz); |
9e75ad5d AB |
7093 | else |
7094 | #endif | |
b772434b | 7095 | ret = set_user_sigmask(sig, sigsz); |
9e75ad5d | 7096 | |
2b188cc1 JA |
7097 | if (ret) |
7098 | return ret; | |
7099 | } | |
7100 | ||
c73ebb68 HX |
7101 | if (uts) { |
7102 | if (get_timespec64(&ts, uts)) | |
7103 | return -EFAULT; | |
7104 | timeout = timespec64_to_jiffies(&ts); | |
7105 | } | |
7106 | ||
bda52162 | 7107 | iowq.nr_timeouts = atomic_read(&ctx->cq_timeouts); |
c826bd7a | 7108 | trace_io_uring_cqring_wait(ctx, min_events); |
bda52162 JA |
7109 | do { |
7110 | prepare_to_wait_exclusive(&ctx->wait, &iowq.wq, | |
7111 | TASK_INTERRUPTIBLE); | |
ce593a6c | 7112 | /* make sure we run task_work before checking for signals */ |
af9c1a44 JA |
7113 | ret = io_run_task_work_sig(); |
7114 | if (ret > 0) | |
4c6e277c | 7115 | continue; |
af9c1a44 | 7116 | else if (ret < 0) |
bda52162 | 7117 | break; |
ce593a6c JA |
7118 | if (io_should_wake(&iowq, false)) |
7119 | break; | |
c73ebb68 HX |
7120 | if (uts) { |
7121 | timeout = schedule_timeout(timeout); | |
7122 | if (timeout == 0) { | |
7123 | ret = -ETIME; | |
7124 | break; | |
7125 | } | |
7126 | } else { | |
7127 | schedule(); | |
7128 | } | |
bda52162 JA |
7129 | } while (1); |
7130 | finish_wait(&ctx->wait, &iowq.wq); | |
7131 | ||
b7db41c9 | 7132 | restore_saved_sigmask_unless(ret == -EINTR); |
2b188cc1 | 7133 | |
75b28aff | 7134 | return READ_ONCE(rings->cq.head) == READ_ONCE(rings->cq.tail) ? ret : 0; |
2b188cc1 JA |
7135 | } |
7136 | ||
6b06314c JA |
7137 | static void __io_sqe_files_unregister(struct io_ring_ctx *ctx) |
7138 | { | |
7139 | #if defined(CONFIG_UNIX) | |
7140 | if (ctx->ring_sock) { | |
7141 | struct sock *sock = ctx->ring_sock->sk; | |
7142 | struct sk_buff *skb; | |
7143 | ||
7144 | while ((skb = skb_dequeue(&sock->sk_receive_queue)) != NULL) | |
7145 | kfree_skb(skb); | |
7146 | } | |
7147 | #else | |
7148 | int i; | |
7149 | ||
65e19f54 JA |
7150 | for (i = 0; i < ctx->nr_user_files; i++) { |
7151 | struct file *file; | |
7152 | ||
7153 | file = io_file_from_index(ctx, i); | |
7154 | if (file) | |
7155 | fput(file); | |
7156 | } | |
6b06314c JA |
7157 | #endif |
7158 | } | |
7159 | ||
05f3fb3c JA |
7160 | static void io_file_ref_kill(struct percpu_ref *ref) |
7161 | { | |
7162 | struct fixed_file_data *data; | |
7163 | ||
7164 | data = container_of(ref, struct fixed_file_data, refs); | |
7165 | complete(&data->done); | |
7166 | } | |
7167 | ||
6b06314c JA |
7168 | static int io_sqe_files_unregister(struct io_ring_ctx *ctx) |
7169 | { | |
05f3fb3c | 7170 | struct fixed_file_data *data = ctx->file_data; |
05589553 | 7171 | struct fixed_file_ref_node *ref_node = NULL; |
65e19f54 JA |
7172 | unsigned nr_tables, i; |
7173 | ||
05f3fb3c | 7174 | if (!data) |
6b06314c JA |
7175 | return -ENXIO; |
7176 | ||
6a4d07cd | 7177 | spin_lock(&data->lock); |
1e5d770b | 7178 | ref_node = data->node; |
6a4d07cd | 7179 | spin_unlock(&data->lock); |
05589553 XW |
7180 | if (ref_node) |
7181 | percpu_ref_kill(&ref_node->refs); | |
7182 | ||
7183 | percpu_ref_kill(&data->refs); | |
7184 | ||
7185 | /* wait for all refs nodes to complete */ | |
4a38aed2 | 7186 | flush_delayed_work(&ctx->file_put_work); |
2faf852d | 7187 | wait_for_completion(&data->done); |
05f3fb3c | 7188 | |
6b06314c | 7189 | __io_sqe_files_unregister(ctx); |
65e19f54 JA |
7190 | nr_tables = DIV_ROUND_UP(ctx->nr_user_files, IORING_MAX_FILES_TABLE); |
7191 | for (i = 0; i < nr_tables; i++) | |
05f3fb3c JA |
7192 | kfree(data->table[i].files); |
7193 | kfree(data->table); | |
05589553 XW |
7194 | percpu_ref_exit(&data->refs); |
7195 | kfree(data); | |
05f3fb3c | 7196 | ctx->file_data = NULL; |
6b06314c JA |
7197 | ctx->nr_user_files = 0; |
7198 | return 0; | |
7199 | } | |
7200 | ||
534ca6d6 | 7201 | static void io_put_sq_data(struct io_sq_data *sqd) |
6c271ce2 | 7202 | { |
534ca6d6 | 7203 | if (refcount_dec_and_test(&sqd->refs)) { |
2bbcd6d3 RP |
7204 | /* |
7205 | * The park is a bit of a work-around, without it we get | |
7206 | * warning spews on shutdown with SQPOLL set and affinity | |
7207 | * set to a single CPU. | |
7208 | */ | |
534ca6d6 JA |
7209 | if (sqd->thread) { |
7210 | kthread_park(sqd->thread); | |
7211 | kthread_stop(sqd->thread); | |
7212 | } | |
7213 | ||
7214 | kfree(sqd); | |
7215 | } | |
7216 | } | |
7217 | ||
aa06165d JA |
7218 | static struct io_sq_data *io_attach_sq_data(struct io_uring_params *p) |
7219 | { | |
7220 | struct io_ring_ctx *ctx_attach; | |
7221 | struct io_sq_data *sqd; | |
7222 | struct fd f; | |
7223 | ||
7224 | f = fdget(p->wq_fd); | |
7225 | if (!f.file) | |
7226 | return ERR_PTR(-ENXIO); | |
7227 | if (f.file->f_op != &io_uring_fops) { | |
7228 | fdput(f); | |
7229 | return ERR_PTR(-EINVAL); | |
7230 | } | |
7231 | ||
7232 | ctx_attach = f.file->private_data; | |
7233 | sqd = ctx_attach->sq_data; | |
7234 | if (!sqd) { | |
7235 | fdput(f); | |
7236 | return ERR_PTR(-EINVAL); | |
7237 | } | |
7238 | ||
7239 | refcount_inc(&sqd->refs); | |
7240 | fdput(f); | |
7241 | return sqd; | |
7242 | } | |
7243 | ||
534ca6d6 JA |
7244 | static struct io_sq_data *io_get_sq_data(struct io_uring_params *p) |
7245 | { | |
7246 | struct io_sq_data *sqd; | |
7247 | ||
aa06165d JA |
7248 | if (p->flags & IORING_SETUP_ATTACH_WQ) |
7249 | return io_attach_sq_data(p); | |
7250 | ||
534ca6d6 JA |
7251 | sqd = kzalloc(sizeof(*sqd), GFP_KERNEL); |
7252 | if (!sqd) | |
7253 | return ERR_PTR(-ENOMEM); | |
7254 | ||
7255 | refcount_set(&sqd->refs, 1); | |
69fb2131 JA |
7256 | INIT_LIST_HEAD(&sqd->ctx_list); |
7257 | INIT_LIST_HEAD(&sqd->ctx_new_list); | |
7258 | mutex_init(&sqd->ctx_lock); | |
7259 | mutex_init(&sqd->lock); | |
534ca6d6 JA |
7260 | init_waitqueue_head(&sqd->wait); |
7261 | return sqd; | |
7262 | } | |
7263 | ||
69fb2131 JA |
7264 | static void io_sq_thread_unpark(struct io_sq_data *sqd) |
7265 | __releases(&sqd->lock) | |
7266 | { | |
7267 | if (!sqd->thread) | |
7268 | return; | |
7269 | kthread_unpark(sqd->thread); | |
7270 | mutex_unlock(&sqd->lock); | |
7271 | } | |
7272 | ||
7273 | static void io_sq_thread_park(struct io_sq_data *sqd) | |
7274 | __acquires(&sqd->lock) | |
7275 | { | |
7276 | if (!sqd->thread) | |
7277 | return; | |
7278 | mutex_lock(&sqd->lock); | |
7279 | kthread_park(sqd->thread); | |
7280 | } | |
7281 | ||
534ca6d6 JA |
7282 | static void io_sq_thread_stop(struct io_ring_ctx *ctx) |
7283 | { | |
7284 | struct io_sq_data *sqd = ctx->sq_data; | |
7285 | ||
7286 | if (sqd) { | |
7287 | if (sqd->thread) { | |
7288 | /* | |
7289 | * We may arrive here from the error branch in | |
7290 | * io_sq_offload_create() where the kthread is created | |
7291 | * without being waked up, thus wake it up now to make | |
7292 | * sure the wait will complete. | |
7293 | */ | |
7294 | wake_up_process(sqd->thread); | |
7295 | wait_for_completion(&ctx->sq_thread_comp); | |
69fb2131 JA |
7296 | |
7297 | io_sq_thread_park(sqd); | |
7298 | } | |
7299 | ||
7300 | mutex_lock(&sqd->ctx_lock); | |
7301 | list_del(&ctx->sqd_list); | |
08369246 | 7302 | io_sqd_update_thread_idle(sqd); |
69fb2131 JA |
7303 | mutex_unlock(&sqd->ctx_lock); |
7304 | ||
08369246 | 7305 | if (sqd->thread) |
69fb2131 | 7306 | io_sq_thread_unpark(sqd); |
534ca6d6 JA |
7307 | |
7308 | io_put_sq_data(sqd); | |
7309 | ctx->sq_data = NULL; | |
6c271ce2 JA |
7310 | } |
7311 | } | |
7312 | ||
6b06314c JA |
7313 | static void io_finish_async(struct io_ring_ctx *ctx) |
7314 | { | |
6c271ce2 JA |
7315 | io_sq_thread_stop(ctx); |
7316 | ||
561fb04a JA |
7317 | if (ctx->io_wq) { |
7318 | io_wq_destroy(ctx->io_wq); | |
7319 | ctx->io_wq = NULL; | |
6b06314c JA |
7320 | } |
7321 | } | |
7322 | ||
7323 | #if defined(CONFIG_UNIX) | |
6b06314c JA |
7324 | /* |
7325 | * Ensure the UNIX gc is aware of our file set, so we are certain that | |
7326 | * the io_uring can be safely unregistered on process exit, even if we have | |
7327 | * loops in the file referencing. | |
7328 | */ | |
7329 | static int __io_sqe_files_scm(struct io_ring_ctx *ctx, int nr, int offset) | |
7330 | { | |
7331 | struct sock *sk = ctx->ring_sock->sk; | |
7332 | struct scm_fp_list *fpl; | |
7333 | struct sk_buff *skb; | |
08a45173 | 7334 | int i, nr_files; |
6b06314c | 7335 | |
6b06314c JA |
7336 | fpl = kzalloc(sizeof(*fpl), GFP_KERNEL); |
7337 | if (!fpl) | |
7338 | return -ENOMEM; | |
7339 | ||
7340 | skb = alloc_skb(0, GFP_KERNEL); | |
7341 | if (!skb) { | |
7342 | kfree(fpl); | |
7343 | return -ENOMEM; | |
7344 | } | |
7345 | ||
7346 | skb->sk = sk; | |
6b06314c | 7347 | |
08a45173 | 7348 | nr_files = 0; |
6b06314c JA |
7349 | fpl->user = get_uid(ctx->user); |
7350 | for (i = 0; i < nr; i++) { | |
65e19f54 JA |
7351 | struct file *file = io_file_from_index(ctx, i + offset); |
7352 | ||
7353 | if (!file) | |
08a45173 | 7354 | continue; |
65e19f54 | 7355 | fpl->fp[nr_files] = get_file(file); |
08a45173 JA |
7356 | unix_inflight(fpl->user, fpl->fp[nr_files]); |
7357 | nr_files++; | |
6b06314c JA |
7358 | } |
7359 | ||
08a45173 JA |
7360 | if (nr_files) { |
7361 | fpl->max = SCM_MAX_FD; | |
7362 | fpl->count = nr_files; | |
7363 | UNIXCB(skb).fp = fpl; | |
05f3fb3c | 7364 | skb->destructor = unix_destruct_scm; |
08a45173 JA |
7365 | refcount_add(skb->truesize, &sk->sk_wmem_alloc); |
7366 | skb_queue_head(&sk->sk_receive_queue, skb); | |
6b06314c | 7367 | |
08a45173 JA |
7368 | for (i = 0; i < nr_files; i++) |
7369 | fput(fpl->fp[i]); | |
7370 | } else { | |
7371 | kfree_skb(skb); | |
7372 | kfree(fpl); | |
7373 | } | |
6b06314c JA |
7374 | |
7375 | return 0; | |
7376 | } | |
7377 | ||
7378 | /* | |
7379 | * If UNIX sockets are enabled, fd passing can cause a reference cycle which | |
7380 | * causes regular reference counting to break down. We rely on the UNIX | |
7381 | * garbage collection to take care of this problem for us. | |
7382 | */ | |
7383 | static int io_sqe_files_scm(struct io_ring_ctx *ctx) | |
7384 | { | |
7385 | unsigned left, total; | |
7386 | int ret = 0; | |
7387 | ||
7388 | total = 0; | |
7389 | left = ctx->nr_user_files; | |
7390 | while (left) { | |
7391 | unsigned this_files = min_t(unsigned, left, SCM_MAX_FD); | |
6b06314c JA |
7392 | |
7393 | ret = __io_sqe_files_scm(ctx, this_files, total); | |
7394 | if (ret) | |
7395 | break; | |
7396 | left -= this_files; | |
7397 | total += this_files; | |
7398 | } | |
7399 | ||
7400 | if (!ret) | |
7401 | return 0; | |
7402 | ||
7403 | while (total < ctx->nr_user_files) { | |
65e19f54 JA |
7404 | struct file *file = io_file_from_index(ctx, total); |
7405 | ||
7406 | if (file) | |
7407 | fput(file); | |
6b06314c JA |
7408 | total++; |
7409 | } | |
7410 | ||
7411 | return ret; | |
7412 | } | |
7413 | #else | |
7414 | static int io_sqe_files_scm(struct io_ring_ctx *ctx) | |
7415 | { | |
7416 | return 0; | |
7417 | } | |
7418 | #endif | |
7419 | ||
5398ae69 PB |
7420 | static int io_sqe_alloc_file_tables(struct fixed_file_data *file_data, |
7421 | unsigned nr_tables, unsigned nr_files) | |
65e19f54 JA |
7422 | { |
7423 | int i; | |
7424 | ||
7425 | for (i = 0; i < nr_tables; i++) { | |
5398ae69 | 7426 | struct fixed_file_table *table = &file_data->table[i]; |
65e19f54 JA |
7427 | unsigned this_files; |
7428 | ||
7429 | this_files = min(nr_files, IORING_MAX_FILES_TABLE); | |
7430 | table->files = kcalloc(this_files, sizeof(struct file *), | |
7431 | GFP_KERNEL); | |
7432 | if (!table->files) | |
7433 | break; | |
7434 | nr_files -= this_files; | |
7435 | } | |
7436 | ||
7437 | if (i == nr_tables) | |
7438 | return 0; | |
7439 | ||
7440 | for (i = 0; i < nr_tables; i++) { | |
5398ae69 | 7441 | struct fixed_file_table *table = &file_data->table[i]; |
65e19f54 JA |
7442 | kfree(table->files); |
7443 | } | |
7444 | return 1; | |
7445 | } | |
7446 | ||
05f3fb3c JA |
7447 | static void io_ring_file_put(struct io_ring_ctx *ctx, struct file *file) |
7448 | { | |
7449 | #if defined(CONFIG_UNIX) | |
7450 | struct sock *sock = ctx->ring_sock->sk; | |
7451 | struct sk_buff_head list, *head = &sock->sk_receive_queue; | |
7452 | struct sk_buff *skb; | |
7453 | int i; | |
7454 | ||
7455 | __skb_queue_head_init(&list); | |
7456 | ||
7457 | /* | |
7458 | * Find the skb that holds this file in its SCM_RIGHTS. When found, | |
7459 | * remove this entry and rearrange the file array. | |
7460 | */ | |
7461 | skb = skb_dequeue(head); | |
7462 | while (skb) { | |
7463 | struct scm_fp_list *fp; | |
7464 | ||
7465 | fp = UNIXCB(skb).fp; | |
7466 | for (i = 0; i < fp->count; i++) { | |
7467 | int left; | |
7468 | ||
7469 | if (fp->fp[i] != file) | |
7470 | continue; | |
7471 | ||
7472 | unix_notinflight(fp->user, fp->fp[i]); | |
7473 | left = fp->count - 1 - i; | |
7474 | if (left) { | |
7475 | memmove(&fp->fp[i], &fp->fp[i + 1], | |
7476 | left * sizeof(struct file *)); | |
7477 | } | |
7478 | fp->count--; | |
7479 | if (!fp->count) { | |
7480 | kfree_skb(skb); | |
7481 | skb = NULL; | |
7482 | } else { | |
7483 | __skb_queue_tail(&list, skb); | |
7484 | } | |
7485 | fput(file); | |
7486 | file = NULL; | |
7487 | break; | |
7488 | } | |
7489 | ||
7490 | if (!file) | |
7491 | break; | |
7492 | ||
7493 | __skb_queue_tail(&list, skb); | |
7494 | ||
7495 | skb = skb_dequeue(head); | |
7496 | } | |
7497 | ||
7498 | if (skb_peek(&list)) { | |
7499 | spin_lock_irq(&head->lock); | |
7500 | while ((skb = __skb_dequeue(&list)) != NULL) | |
7501 | __skb_queue_tail(head, skb); | |
7502 | spin_unlock_irq(&head->lock); | |
7503 | } | |
7504 | #else | |
7505 | fput(file); | |
7506 | #endif | |
7507 | } | |
7508 | ||
7509 | struct io_file_put { | |
05589553 | 7510 | struct list_head list; |
05f3fb3c | 7511 | struct file *file; |
05f3fb3c JA |
7512 | }; |
7513 | ||
4a38aed2 | 7514 | static void __io_file_put_work(struct fixed_file_ref_node *ref_node) |
65e19f54 | 7515 | { |
4a38aed2 JA |
7516 | struct fixed_file_data *file_data = ref_node->file_data; |
7517 | struct io_ring_ctx *ctx = file_data->ctx; | |
05f3fb3c | 7518 | struct io_file_put *pfile, *tmp; |
05589553 XW |
7519 | |
7520 | list_for_each_entry_safe(pfile, tmp, &ref_node->file_list, list) { | |
6a4d07cd | 7521 | list_del(&pfile->list); |
05589553 XW |
7522 | io_ring_file_put(ctx, pfile->file); |
7523 | kfree(pfile); | |
65e19f54 | 7524 | } |
05589553 | 7525 | |
05589553 XW |
7526 | percpu_ref_exit(&ref_node->refs); |
7527 | kfree(ref_node); | |
7528 | percpu_ref_put(&file_data->refs); | |
2faf852d | 7529 | } |
65e19f54 | 7530 | |
4a38aed2 JA |
7531 | static void io_file_put_work(struct work_struct *work) |
7532 | { | |
7533 | struct io_ring_ctx *ctx; | |
7534 | struct llist_node *node; | |
7535 | ||
7536 | ctx = container_of(work, struct io_ring_ctx, file_put_work.work); | |
7537 | node = llist_del_all(&ctx->file_put_llist); | |
7538 | ||
7539 | while (node) { | |
7540 | struct fixed_file_ref_node *ref_node; | |
7541 | struct llist_node *next = node->next; | |
7542 | ||
7543 | ref_node = llist_entry(node, struct fixed_file_ref_node, llist); | |
7544 | __io_file_put_work(ref_node); | |
7545 | node = next; | |
7546 | } | |
7547 | } | |
7548 | ||
05589553 | 7549 | static void io_file_data_ref_zero(struct percpu_ref *ref) |
2faf852d | 7550 | { |
05589553 | 7551 | struct fixed_file_ref_node *ref_node; |
e297822b | 7552 | struct fixed_file_data *data; |
4a38aed2 | 7553 | struct io_ring_ctx *ctx; |
e297822b | 7554 | bool first_add = false; |
4a38aed2 | 7555 | int delay = HZ; |
65e19f54 | 7556 | |
05589553 | 7557 | ref_node = container_of(ref, struct fixed_file_ref_node, refs); |
e297822b PB |
7558 | data = ref_node->file_data; |
7559 | ctx = data->ctx; | |
7560 | ||
7561 | spin_lock(&data->lock); | |
7562 | ref_node->done = true; | |
7563 | ||
7564 | while (!list_empty(&data->ref_list)) { | |
7565 | ref_node = list_first_entry(&data->ref_list, | |
7566 | struct fixed_file_ref_node, node); | |
7567 | /* recycle ref nodes in order */ | |
7568 | if (!ref_node->done) | |
7569 | break; | |
7570 | list_del(&ref_node->node); | |
7571 | first_add |= llist_add(&ref_node->llist, &ctx->file_put_llist); | |
7572 | } | |
7573 | spin_unlock(&data->lock); | |
05589553 | 7574 | |
e297822b | 7575 | if (percpu_ref_is_dying(&data->refs)) |
4a38aed2 | 7576 | delay = 0; |
05589553 | 7577 | |
4a38aed2 JA |
7578 | if (!delay) |
7579 | mod_delayed_work(system_wq, &ctx->file_put_work, 0); | |
7580 | else if (first_add) | |
7581 | queue_delayed_work(system_wq, &ctx->file_put_work, delay); | |
05f3fb3c | 7582 | } |
65e19f54 | 7583 | |
05589553 XW |
7584 | static struct fixed_file_ref_node *alloc_fixed_file_ref_node( |
7585 | struct io_ring_ctx *ctx) | |
05f3fb3c | 7586 | { |
05589553 | 7587 | struct fixed_file_ref_node *ref_node; |
05f3fb3c | 7588 | |
05589553 XW |
7589 | ref_node = kzalloc(sizeof(*ref_node), GFP_KERNEL); |
7590 | if (!ref_node) | |
7591 | return ERR_PTR(-ENOMEM); | |
05f3fb3c | 7592 | |
05589553 XW |
7593 | if (percpu_ref_init(&ref_node->refs, io_file_data_ref_zero, |
7594 | 0, GFP_KERNEL)) { | |
7595 | kfree(ref_node); | |
7596 | return ERR_PTR(-ENOMEM); | |
7597 | } | |
7598 | INIT_LIST_HEAD(&ref_node->node); | |
7599 | INIT_LIST_HEAD(&ref_node->file_list); | |
05589553 | 7600 | ref_node->file_data = ctx->file_data; |
e297822b | 7601 | ref_node->done = false; |
05589553 | 7602 | return ref_node; |
05589553 XW |
7603 | } |
7604 | ||
7605 | static void destroy_fixed_file_ref_node(struct fixed_file_ref_node *ref_node) | |
7606 | { | |
7607 | percpu_ref_exit(&ref_node->refs); | |
7608 | kfree(ref_node); | |
65e19f54 JA |
7609 | } |
7610 | ||
6b06314c JA |
7611 | static int io_sqe_files_register(struct io_ring_ctx *ctx, void __user *arg, |
7612 | unsigned nr_args) | |
7613 | { | |
7614 | __s32 __user *fds = (__s32 __user *) arg; | |
600cf3f8 | 7615 | unsigned nr_tables, i; |
05f3fb3c | 7616 | struct file *file; |
600cf3f8 | 7617 | int fd, ret = -ENOMEM; |
05589553 | 7618 | struct fixed_file_ref_node *ref_node; |
5398ae69 | 7619 | struct fixed_file_data *file_data; |
6b06314c | 7620 | |
05f3fb3c | 7621 | if (ctx->file_data) |
6b06314c JA |
7622 | return -EBUSY; |
7623 | if (!nr_args) | |
7624 | return -EINVAL; | |
7625 | if (nr_args > IORING_MAX_FIXED_FILES) | |
7626 | return -EMFILE; | |
7627 | ||
5398ae69 PB |
7628 | file_data = kzalloc(sizeof(*ctx->file_data), GFP_KERNEL); |
7629 | if (!file_data) | |
05f3fb3c | 7630 | return -ENOMEM; |
5398ae69 PB |
7631 | file_data->ctx = ctx; |
7632 | init_completion(&file_data->done); | |
7633 | INIT_LIST_HEAD(&file_data->ref_list); | |
7634 | spin_lock_init(&file_data->lock); | |
05f3fb3c | 7635 | |
65e19f54 | 7636 | nr_tables = DIV_ROUND_UP(nr_args, IORING_MAX_FILES_TABLE); |
035fbafc | 7637 | file_data->table = kcalloc(nr_tables, sizeof(*file_data->table), |
5398ae69 | 7638 | GFP_KERNEL); |
600cf3f8 PB |
7639 | if (!file_data->table) |
7640 | goto out_free; | |
05f3fb3c | 7641 | |
5398ae69 | 7642 | if (percpu_ref_init(&file_data->refs, io_file_ref_kill, |
600cf3f8 PB |
7643 | PERCPU_REF_ALLOW_REINIT, GFP_KERNEL)) |
7644 | goto out_free; | |
6b06314c | 7645 | |
600cf3f8 PB |
7646 | if (io_sqe_alloc_file_tables(file_data, nr_tables, nr_args)) |
7647 | goto out_ref; | |
55cbc256 | 7648 | ctx->file_data = file_data; |
65e19f54 | 7649 | |
08a45173 | 7650 | for (i = 0; i < nr_args; i++, ctx->nr_user_files++) { |
65e19f54 JA |
7651 | struct fixed_file_table *table; |
7652 | unsigned index; | |
7653 | ||
600cf3f8 PB |
7654 | if (copy_from_user(&fd, &fds[i], sizeof(fd))) { |
7655 | ret = -EFAULT; | |
7656 | goto out_fput; | |
7657 | } | |
08a45173 | 7658 | /* allow sparse sets */ |
600cf3f8 | 7659 | if (fd == -1) |
08a45173 | 7660 | continue; |
6b06314c | 7661 | |
05f3fb3c | 7662 | file = fget(fd); |
6b06314c | 7663 | ret = -EBADF; |
05f3fb3c | 7664 | if (!file) |
600cf3f8 | 7665 | goto out_fput; |
05f3fb3c | 7666 | |
6b06314c JA |
7667 | /* |
7668 | * Don't allow io_uring instances to be registered. If UNIX | |
7669 | * isn't enabled, then this causes a reference cycle and this | |
7670 | * instance can never get freed. If UNIX is enabled we'll | |
7671 | * handle it just fine, but there's still no point in allowing | |
7672 | * a ring fd as it doesn't support regular read/write anyway. | |
7673 | */ | |
05f3fb3c JA |
7674 | if (file->f_op == &io_uring_fops) { |
7675 | fput(file); | |
600cf3f8 | 7676 | goto out_fput; |
6b06314c | 7677 | } |
600cf3f8 PB |
7678 | table = &file_data->table[i >> IORING_FILE_TABLE_SHIFT]; |
7679 | index = i & IORING_FILE_TABLE_MASK; | |
05f3fb3c | 7680 | table->files[index] = file; |
6b06314c JA |
7681 | } |
7682 | ||
6b06314c | 7683 | ret = io_sqe_files_scm(ctx); |
05589553 | 7684 | if (ret) { |
6b06314c | 7685 | io_sqe_files_unregister(ctx); |
05589553 XW |
7686 | return ret; |
7687 | } | |
6b06314c | 7688 | |
05589553 XW |
7689 | ref_node = alloc_fixed_file_ref_node(ctx); |
7690 | if (IS_ERR(ref_node)) { | |
7691 | io_sqe_files_unregister(ctx); | |
7692 | return PTR_ERR(ref_node); | |
7693 | } | |
7694 | ||
b2e96852 | 7695 | file_data->node = ref_node; |
5398ae69 | 7696 | spin_lock(&file_data->lock); |
e297822b | 7697 | list_add_tail(&ref_node->node, &file_data->ref_list); |
5398ae69 PB |
7698 | spin_unlock(&file_data->lock); |
7699 | percpu_ref_get(&file_data->refs); | |
6b06314c | 7700 | return ret; |
600cf3f8 PB |
7701 | out_fput: |
7702 | for (i = 0; i < ctx->nr_user_files; i++) { | |
7703 | file = io_file_from_index(ctx, i); | |
7704 | if (file) | |
7705 | fput(file); | |
7706 | } | |
7707 | for (i = 0; i < nr_tables; i++) | |
7708 | kfree(file_data->table[i].files); | |
7709 | ctx->nr_user_files = 0; | |
7710 | out_ref: | |
7711 | percpu_ref_exit(&file_data->refs); | |
7712 | out_free: | |
7713 | kfree(file_data->table); | |
7714 | kfree(file_data); | |
55cbc256 | 7715 | ctx->file_data = NULL; |
6b06314c JA |
7716 | return ret; |
7717 | } | |
7718 | ||
c3a31e60 JA |
7719 | static int io_sqe_file_register(struct io_ring_ctx *ctx, struct file *file, |
7720 | int index) | |
7721 | { | |
7722 | #if defined(CONFIG_UNIX) | |
7723 | struct sock *sock = ctx->ring_sock->sk; | |
7724 | struct sk_buff_head *head = &sock->sk_receive_queue; | |
7725 | struct sk_buff *skb; | |
7726 | ||
7727 | /* | |
7728 | * See if we can merge this file into an existing skb SCM_RIGHTS | |
7729 | * file set. If there's no room, fall back to allocating a new skb | |
7730 | * and filling it in. | |
7731 | */ | |
7732 | spin_lock_irq(&head->lock); | |
7733 | skb = skb_peek(head); | |
7734 | if (skb) { | |
7735 | struct scm_fp_list *fpl = UNIXCB(skb).fp; | |
7736 | ||
7737 | if (fpl->count < SCM_MAX_FD) { | |
7738 | __skb_unlink(skb, head); | |
7739 | spin_unlock_irq(&head->lock); | |
7740 | fpl->fp[fpl->count] = get_file(file); | |
7741 | unix_inflight(fpl->user, fpl->fp[fpl->count]); | |
7742 | fpl->count++; | |
7743 | spin_lock_irq(&head->lock); | |
7744 | __skb_queue_head(head, skb); | |
7745 | } else { | |
7746 | skb = NULL; | |
7747 | } | |
7748 | } | |
7749 | spin_unlock_irq(&head->lock); | |
7750 | ||
7751 | if (skb) { | |
7752 | fput(file); | |
7753 | return 0; | |
7754 | } | |
7755 | ||
7756 | return __io_sqe_files_scm(ctx, 1, index); | |
7757 | #else | |
7758 | return 0; | |
7759 | #endif | |
7760 | } | |
7761 | ||
a5318d3c | 7762 | static int io_queue_file_removal(struct fixed_file_data *data, |
05589553 | 7763 | struct file *file) |
05f3fb3c | 7764 | { |
a5318d3c | 7765 | struct io_file_put *pfile; |
b2e96852 | 7766 | struct fixed_file_ref_node *ref_node = data->node; |
05f3fb3c | 7767 | |
05f3fb3c | 7768 | pfile = kzalloc(sizeof(*pfile), GFP_KERNEL); |
a5318d3c HD |
7769 | if (!pfile) |
7770 | return -ENOMEM; | |
05f3fb3c JA |
7771 | |
7772 | pfile->file = file; | |
05589553 XW |
7773 | list_add(&pfile->list, &ref_node->file_list); |
7774 | ||
a5318d3c | 7775 | return 0; |
05f3fb3c JA |
7776 | } |
7777 | ||
7778 | static int __io_sqe_files_update(struct io_ring_ctx *ctx, | |
7779 | struct io_uring_files_update *up, | |
7780 | unsigned nr_args) | |
7781 | { | |
7782 | struct fixed_file_data *data = ctx->file_data; | |
05589553 | 7783 | struct fixed_file_ref_node *ref_node; |
05f3fb3c | 7784 | struct file *file; |
c3a31e60 JA |
7785 | __s32 __user *fds; |
7786 | int fd, i, err; | |
7787 | __u32 done; | |
05589553 | 7788 | bool needs_switch = false; |
c3a31e60 | 7789 | |
05f3fb3c | 7790 | if (check_add_overflow(up->offset, nr_args, &done)) |
c3a31e60 JA |
7791 | return -EOVERFLOW; |
7792 | if (done > ctx->nr_user_files) | |
7793 | return -EINVAL; | |
7794 | ||
05589553 XW |
7795 | ref_node = alloc_fixed_file_ref_node(ctx); |
7796 | if (IS_ERR(ref_node)) | |
7797 | return PTR_ERR(ref_node); | |
7798 | ||
c3a31e60 | 7799 | done = 0; |
05f3fb3c | 7800 | fds = u64_to_user_ptr(up->fds); |
c3a31e60 | 7801 | while (nr_args) { |
65e19f54 JA |
7802 | struct fixed_file_table *table; |
7803 | unsigned index; | |
7804 | ||
c3a31e60 JA |
7805 | err = 0; |
7806 | if (copy_from_user(&fd, &fds[done], sizeof(fd))) { | |
7807 | err = -EFAULT; | |
7808 | break; | |
7809 | } | |
05f3fb3c JA |
7810 | i = array_index_nospec(up->offset, ctx->nr_user_files); |
7811 | table = &ctx->file_data->table[i >> IORING_FILE_TABLE_SHIFT]; | |
65e19f54 JA |
7812 | index = i & IORING_FILE_TABLE_MASK; |
7813 | if (table->files[index]) { | |
98dfd502 | 7814 | file = table->files[index]; |
a5318d3c HD |
7815 | err = io_queue_file_removal(data, file); |
7816 | if (err) | |
7817 | break; | |
65e19f54 | 7818 | table->files[index] = NULL; |
05589553 | 7819 | needs_switch = true; |
c3a31e60 JA |
7820 | } |
7821 | if (fd != -1) { | |
c3a31e60 JA |
7822 | file = fget(fd); |
7823 | if (!file) { | |
7824 | err = -EBADF; | |
7825 | break; | |
7826 | } | |
7827 | /* | |
7828 | * Don't allow io_uring instances to be registered. If | |
7829 | * UNIX isn't enabled, then this causes a reference | |
7830 | * cycle and this instance can never get freed. If UNIX | |
7831 | * is enabled we'll handle it just fine, but there's | |
7832 | * still no point in allowing a ring fd as it doesn't | |
7833 | * support regular read/write anyway. | |
7834 | */ | |
7835 | if (file->f_op == &io_uring_fops) { | |
7836 | fput(file); | |
7837 | err = -EBADF; | |
7838 | break; | |
7839 | } | |
65e19f54 | 7840 | table->files[index] = file; |
c3a31e60 | 7841 | err = io_sqe_file_register(ctx, file, i); |
f3bd9dae | 7842 | if (err) { |
95d1c8e5 | 7843 | table->files[index] = NULL; |
f3bd9dae | 7844 | fput(file); |
c3a31e60 | 7845 | break; |
f3bd9dae | 7846 | } |
c3a31e60 JA |
7847 | } |
7848 | nr_args--; | |
7849 | done++; | |
05f3fb3c JA |
7850 | up->offset++; |
7851 | } | |
7852 | ||
05589553 | 7853 | if (needs_switch) { |
b2e96852 | 7854 | percpu_ref_kill(&data->node->refs); |
6a4d07cd | 7855 | spin_lock(&data->lock); |
e297822b | 7856 | list_add_tail(&ref_node->node, &data->ref_list); |
b2e96852 | 7857 | data->node = ref_node; |
6a4d07cd | 7858 | spin_unlock(&data->lock); |
05589553 XW |
7859 | percpu_ref_get(&ctx->file_data->refs); |
7860 | } else | |
7861 | destroy_fixed_file_ref_node(ref_node); | |
c3a31e60 JA |
7862 | |
7863 | return done ? done : err; | |
7864 | } | |
05589553 | 7865 | |
05f3fb3c JA |
7866 | static int io_sqe_files_update(struct io_ring_ctx *ctx, void __user *arg, |
7867 | unsigned nr_args) | |
7868 | { | |
7869 | struct io_uring_files_update up; | |
7870 | ||
7871 | if (!ctx->file_data) | |
7872 | return -ENXIO; | |
7873 | if (!nr_args) | |
7874 | return -EINVAL; | |
7875 | if (copy_from_user(&up, arg, sizeof(up))) | |
7876 | return -EFAULT; | |
7877 | if (up.resv) | |
7878 | return -EINVAL; | |
7879 | ||
7880 | return __io_sqe_files_update(ctx, &up, nr_args); | |
7881 | } | |
c3a31e60 | 7882 | |
e9fd9396 | 7883 | static void io_free_work(struct io_wq_work *work) |
7d723065 JA |
7884 | { |
7885 | struct io_kiocb *req = container_of(work, struct io_kiocb, work); | |
7886 | ||
e9fd9396 | 7887 | /* Consider that io_steal_work() relies on this ref */ |
7d723065 JA |
7888 | io_put_req(req); |
7889 | } | |
7890 | ||
24369c2e PB |
7891 | static int io_init_wq_offload(struct io_ring_ctx *ctx, |
7892 | struct io_uring_params *p) | |
7893 | { | |
7894 | struct io_wq_data data; | |
7895 | struct fd f; | |
7896 | struct io_ring_ctx *ctx_attach; | |
7897 | unsigned int concurrency; | |
7898 | int ret = 0; | |
7899 | ||
7900 | data.user = ctx->user; | |
e9fd9396 | 7901 | data.free_work = io_free_work; |
f5fa38c5 | 7902 | data.do_work = io_wq_submit_work; |
24369c2e PB |
7903 | |
7904 | if (!(p->flags & IORING_SETUP_ATTACH_WQ)) { | |
7905 | /* Do QD, or 4 * CPUS, whatever is smallest */ | |
7906 | concurrency = min(ctx->sq_entries, 4 * num_online_cpus()); | |
7907 | ||
7908 | ctx->io_wq = io_wq_create(concurrency, &data); | |
7909 | if (IS_ERR(ctx->io_wq)) { | |
7910 | ret = PTR_ERR(ctx->io_wq); | |
7911 | ctx->io_wq = NULL; | |
7912 | } | |
7913 | return ret; | |
7914 | } | |
7915 | ||
7916 | f = fdget(p->wq_fd); | |
7917 | if (!f.file) | |
7918 | return -EBADF; | |
7919 | ||
7920 | if (f.file->f_op != &io_uring_fops) { | |
7921 | ret = -EINVAL; | |
7922 | goto out_fput; | |
7923 | } | |
7924 | ||
7925 | ctx_attach = f.file->private_data; | |
7926 | /* @io_wq is protected by holding the fd */ | |
7927 | if (!io_wq_get(ctx_attach->io_wq, &data)) { | |
7928 | ret = -EINVAL; | |
7929 | goto out_fput; | |
7930 | } | |
7931 | ||
7932 | ctx->io_wq = ctx_attach->io_wq; | |
7933 | out_fput: | |
7934 | fdput(f); | |
7935 | return ret; | |
7936 | } | |
7937 | ||
0f212204 JA |
7938 | static int io_uring_alloc_task_context(struct task_struct *task) |
7939 | { | |
7940 | struct io_uring_task *tctx; | |
d8a6df10 | 7941 | int ret; |
0f212204 JA |
7942 | |
7943 | tctx = kmalloc(sizeof(*tctx), GFP_KERNEL); | |
7944 | if (unlikely(!tctx)) | |
7945 | return -ENOMEM; | |
7946 | ||
d8a6df10 JA |
7947 | ret = percpu_counter_init(&tctx->inflight, 0, GFP_KERNEL); |
7948 | if (unlikely(ret)) { | |
7949 | kfree(tctx); | |
7950 | return ret; | |
7951 | } | |
7952 | ||
0f212204 JA |
7953 | xa_init(&tctx->xa); |
7954 | init_waitqueue_head(&tctx->wait); | |
7955 | tctx->last = NULL; | |
fdaf083c JA |
7956 | atomic_set(&tctx->in_idle, 0); |
7957 | tctx->sqpoll = false; | |
500a373d JA |
7958 | io_init_identity(&tctx->__identity); |
7959 | tctx->identity = &tctx->__identity; | |
0f212204 JA |
7960 | task->io_uring = tctx; |
7961 | return 0; | |
7962 | } | |
7963 | ||
7964 | void __io_uring_free(struct task_struct *tsk) | |
7965 | { | |
7966 | struct io_uring_task *tctx = tsk->io_uring; | |
7967 | ||
7968 | WARN_ON_ONCE(!xa_empty(&tctx->xa)); | |
500a373d JA |
7969 | WARN_ON_ONCE(refcount_read(&tctx->identity->count) != 1); |
7970 | if (tctx->identity != &tctx->__identity) | |
7971 | kfree(tctx->identity); | |
d8a6df10 | 7972 | percpu_counter_destroy(&tctx->inflight); |
0f212204 JA |
7973 | kfree(tctx); |
7974 | tsk->io_uring = NULL; | |
7975 | } | |
7976 | ||
7e84e1c7 SG |
7977 | static int io_sq_offload_create(struct io_ring_ctx *ctx, |
7978 | struct io_uring_params *p) | |
2b188cc1 JA |
7979 | { |
7980 | int ret; | |
7981 | ||
6c271ce2 | 7982 | if (ctx->flags & IORING_SETUP_SQPOLL) { |
534ca6d6 JA |
7983 | struct io_sq_data *sqd; |
7984 | ||
3ec482d1 | 7985 | ret = -EPERM; |
ce59fc69 | 7986 | if (!capable(CAP_SYS_ADMIN) && !capable(CAP_SYS_NICE)) |
3ec482d1 JA |
7987 | goto err; |
7988 | ||
534ca6d6 JA |
7989 | sqd = io_get_sq_data(p); |
7990 | if (IS_ERR(sqd)) { | |
7991 | ret = PTR_ERR(sqd); | |
7992 | goto err; | |
7993 | } | |
69fb2131 | 7994 | |
534ca6d6 | 7995 | ctx->sq_data = sqd; |
69fb2131 JA |
7996 | io_sq_thread_park(sqd); |
7997 | mutex_lock(&sqd->ctx_lock); | |
7998 | list_add(&ctx->sqd_list, &sqd->ctx_new_list); | |
7999 | mutex_unlock(&sqd->ctx_lock); | |
8000 | io_sq_thread_unpark(sqd); | |
534ca6d6 | 8001 | |
917257da JA |
8002 | ctx->sq_thread_idle = msecs_to_jiffies(p->sq_thread_idle); |
8003 | if (!ctx->sq_thread_idle) | |
8004 | ctx->sq_thread_idle = HZ; | |
8005 | ||
aa06165d JA |
8006 | if (sqd->thread) |
8007 | goto done; | |
8008 | ||
6c271ce2 | 8009 | if (p->flags & IORING_SETUP_SQ_AFF) { |
44a9bd18 | 8010 | int cpu = p->sq_thread_cpu; |
6c271ce2 | 8011 | |
917257da | 8012 | ret = -EINVAL; |
44a9bd18 JA |
8013 | if (cpu >= nr_cpu_ids) |
8014 | goto err; | |
7889f44d | 8015 | if (!cpu_online(cpu)) |
917257da JA |
8016 | goto err; |
8017 | ||
69fb2131 | 8018 | sqd->thread = kthread_create_on_cpu(io_sq_thread, sqd, |
534ca6d6 | 8019 | cpu, "io_uring-sq"); |
6c271ce2 | 8020 | } else { |
69fb2131 | 8021 | sqd->thread = kthread_create(io_sq_thread, sqd, |
6c271ce2 JA |
8022 | "io_uring-sq"); |
8023 | } | |
534ca6d6 JA |
8024 | if (IS_ERR(sqd->thread)) { |
8025 | ret = PTR_ERR(sqd->thread); | |
8026 | sqd->thread = NULL; | |
6c271ce2 JA |
8027 | goto err; |
8028 | } | |
534ca6d6 | 8029 | ret = io_uring_alloc_task_context(sqd->thread); |
0f212204 JA |
8030 | if (ret) |
8031 | goto err; | |
6c271ce2 JA |
8032 | } else if (p->flags & IORING_SETUP_SQ_AFF) { |
8033 | /* Can't have SQ_AFF without SQPOLL */ | |
8034 | ret = -EINVAL; | |
8035 | goto err; | |
8036 | } | |
8037 | ||
aa06165d | 8038 | done: |
24369c2e PB |
8039 | ret = io_init_wq_offload(ctx, p); |
8040 | if (ret) | |
2b188cc1 | 8041 | goto err; |
2b188cc1 JA |
8042 | |
8043 | return 0; | |
8044 | err: | |
54a91f3b | 8045 | io_finish_async(ctx); |
2b188cc1 JA |
8046 | return ret; |
8047 | } | |
8048 | ||
7e84e1c7 SG |
8049 | static void io_sq_offload_start(struct io_ring_ctx *ctx) |
8050 | { | |
534ca6d6 JA |
8051 | struct io_sq_data *sqd = ctx->sq_data; |
8052 | ||
8053 | if ((ctx->flags & IORING_SETUP_SQPOLL) && sqd->thread) | |
8054 | wake_up_process(sqd->thread); | |
7e84e1c7 SG |
8055 | } |
8056 | ||
a087e2b5 BM |
8057 | static inline void __io_unaccount_mem(struct user_struct *user, |
8058 | unsigned long nr_pages) | |
2b188cc1 JA |
8059 | { |
8060 | atomic_long_sub(nr_pages, &user->locked_vm); | |
8061 | } | |
8062 | ||
a087e2b5 BM |
8063 | static inline int __io_account_mem(struct user_struct *user, |
8064 | unsigned long nr_pages) | |
2b188cc1 JA |
8065 | { |
8066 | unsigned long page_limit, cur_pages, new_pages; | |
8067 | ||
8068 | /* Don't allow more pages than we can safely lock */ | |
8069 | page_limit = rlimit(RLIMIT_MEMLOCK) >> PAGE_SHIFT; | |
8070 | ||
8071 | do { | |
8072 | cur_pages = atomic_long_read(&user->locked_vm); | |
8073 | new_pages = cur_pages + nr_pages; | |
8074 | if (new_pages > page_limit) | |
8075 | return -ENOMEM; | |
8076 | } while (atomic_long_cmpxchg(&user->locked_vm, cur_pages, | |
8077 | new_pages) != cur_pages); | |
8078 | ||
8079 | return 0; | |
8080 | } | |
8081 | ||
2e0464d4 BM |
8082 | static void io_unaccount_mem(struct io_ring_ctx *ctx, unsigned long nr_pages, |
8083 | enum io_mem_account acct) | |
a087e2b5 | 8084 | { |
aad5d8da | 8085 | if (ctx->limit_mem) |
a087e2b5 | 8086 | __io_unaccount_mem(ctx->user, nr_pages); |
30975825 | 8087 | |
2aede0e4 | 8088 | if (ctx->mm_account) { |
2e0464d4 | 8089 | if (acct == ACCT_LOCKED) |
2aede0e4 | 8090 | ctx->mm_account->locked_vm -= nr_pages; |
2e0464d4 | 8091 | else if (acct == ACCT_PINNED) |
2aede0e4 | 8092 | atomic64_sub(nr_pages, &ctx->mm_account->pinned_vm); |
2e0464d4 | 8093 | } |
a087e2b5 BM |
8094 | } |
8095 | ||
2e0464d4 BM |
8096 | static int io_account_mem(struct io_ring_ctx *ctx, unsigned long nr_pages, |
8097 | enum io_mem_account acct) | |
a087e2b5 | 8098 | { |
30975825 BM |
8099 | int ret; |
8100 | ||
8101 | if (ctx->limit_mem) { | |
8102 | ret = __io_account_mem(ctx->user, nr_pages); | |
8103 | if (ret) | |
8104 | return ret; | |
8105 | } | |
8106 | ||
2aede0e4 | 8107 | if (ctx->mm_account) { |
2e0464d4 | 8108 | if (acct == ACCT_LOCKED) |
2aede0e4 | 8109 | ctx->mm_account->locked_vm += nr_pages; |
2e0464d4 | 8110 | else if (acct == ACCT_PINNED) |
2aede0e4 | 8111 | atomic64_add(nr_pages, &ctx->mm_account->pinned_vm); |
2e0464d4 | 8112 | } |
a087e2b5 BM |
8113 | |
8114 | return 0; | |
8115 | } | |
8116 | ||
2b188cc1 JA |
8117 | static void io_mem_free(void *ptr) |
8118 | { | |
52e04ef4 MR |
8119 | struct page *page; |
8120 | ||
8121 | if (!ptr) | |
8122 | return; | |
2b188cc1 | 8123 | |
52e04ef4 | 8124 | page = virt_to_head_page(ptr); |
2b188cc1 JA |
8125 | if (put_page_testzero(page)) |
8126 | free_compound_page(page); | |
8127 | } | |
8128 | ||
8129 | static void *io_mem_alloc(size_t size) | |
8130 | { | |
8131 | gfp_t gfp_flags = GFP_KERNEL | __GFP_ZERO | __GFP_NOWARN | __GFP_COMP | | |
8132 | __GFP_NORETRY; | |
8133 | ||
8134 | return (void *) __get_free_pages(gfp_flags, get_order(size)); | |
8135 | } | |
8136 | ||
75b28aff HV |
8137 | static unsigned long rings_size(unsigned sq_entries, unsigned cq_entries, |
8138 | size_t *sq_offset) | |
8139 | { | |
8140 | struct io_rings *rings; | |
8141 | size_t off, sq_array_size; | |
8142 | ||
8143 | off = struct_size(rings, cqes, cq_entries); | |
8144 | if (off == SIZE_MAX) | |
8145 | return SIZE_MAX; | |
8146 | ||
8147 | #ifdef CONFIG_SMP | |
8148 | off = ALIGN(off, SMP_CACHE_BYTES); | |
8149 | if (off == 0) | |
8150 | return SIZE_MAX; | |
8151 | #endif | |
8152 | ||
b36200f5 DV |
8153 | if (sq_offset) |
8154 | *sq_offset = off; | |
8155 | ||
75b28aff HV |
8156 | sq_array_size = array_size(sizeof(u32), sq_entries); |
8157 | if (sq_array_size == SIZE_MAX) | |
8158 | return SIZE_MAX; | |
8159 | ||
8160 | if (check_add_overflow(off, sq_array_size, &off)) | |
8161 | return SIZE_MAX; | |
8162 | ||
75b28aff HV |
8163 | return off; |
8164 | } | |
8165 | ||
2b188cc1 JA |
8166 | static unsigned long ring_pages(unsigned sq_entries, unsigned cq_entries) |
8167 | { | |
75b28aff | 8168 | size_t pages; |
2b188cc1 | 8169 | |
75b28aff HV |
8170 | pages = (size_t)1 << get_order( |
8171 | rings_size(sq_entries, cq_entries, NULL)); | |
8172 | pages += (size_t)1 << get_order( | |
8173 | array_size(sizeof(struct io_uring_sqe), sq_entries)); | |
2b188cc1 | 8174 | |
75b28aff | 8175 | return pages; |
2b188cc1 JA |
8176 | } |
8177 | ||
edafccee JA |
8178 | static int io_sqe_buffer_unregister(struct io_ring_ctx *ctx) |
8179 | { | |
8180 | int i, j; | |
8181 | ||
8182 | if (!ctx->user_bufs) | |
8183 | return -ENXIO; | |
8184 | ||
8185 | for (i = 0; i < ctx->nr_user_bufs; i++) { | |
8186 | struct io_mapped_ubuf *imu = &ctx->user_bufs[i]; | |
8187 | ||
8188 | for (j = 0; j < imu->nr_bvecs; j++) | |
f1f6a7dd | 8189 | unpin_user_page(imu->bvec[j].bv_page); |
edafccee | 8190 | |
de293938 JA |
8191 | if (imu->acct_pages) |
8192 | io_unaccount_mem(ctx, imu->acct_pages, ACCT_PINNED); | |
d4ef6475 | 8193 | kvfree(imu->bvec); |
edafccee JA |
8194 | imu->nr_bvecs = 0; |
8195 | } | |
8196 | ||
8197 | kfree(ctx->user_bufs); | |
8198 | ctx->user_bufs = NULL; | |
8199 | ctx->nr_user_bufs = 0; | |
8200 | return 0; | |
8201 | } | |
8202 | ||
8203 | static int io_copy_iov(struct io_ring_ctx *ctx, struct iovec *dst, | |
8204 | void __user *arg, unsigned index) | |
8205 | { | |
8206 | struct iovec __user *src; | |
8207 | ||
8208 | #ifdef CONFIG_COMPAT | |
8209 | if (ctx->compat) { | |
8210 | struct compat_iovec __user *ciovs; | |
8211 | struct compat_iovec ciov; | |
8212 | ||
8213 | ciovs = (struct compat_iovec __user *) arg; | |
8214 | if (copy_from_user(&ciov, &ciovs[index], sizeof(ciov))) | |
8215 | return -EFAULT; | |
8216 | ||
d55e5f5b | 8217 | dst->iov_base = u64_to_user_ptr((u64)ciov.iov_base); |
edafccee JA |
8218 | dst->iov_len = ciov.iov_len; |
8219 | return 0; | |
8220 | } | |
8221 | #endif | |
8222 | src = (struct iovec __user *) arg; | |
8223 | if (copy_from_user(dst, &src[index], sizeof(*dst))) | |
8224 | return -EFAULT; | |
8225 | return 0; | |
8226 | } | |
8227 | ||
de293938 JA |
8228 | /* |
8229 | * Not super efficient, but this is just a registration time. And we do cache | |
8230 | * the last compound head, so generally we'll only do a full search if we don't | |
8231 | * match that one. | |
8232 | * | |
8233 | * We check if the given compound head page has already been accounted, to | |
8234 | * avoid double accounting it. This allows us to account the full size of the | |
8235 | * page, not just the constituent pages of a huge page. | |
8236 | */ | |
8237 | static bool headpage_already_acct(struct io_ring_ctx *ctx, struct page **pages, | |
8238 | int nr_pages, struct page *hpage) | |
8239 | { | |
8240 | int i, j; | |
8241 | ||
8242 | /* check current page array */ | |
8243 | for (i = 0; i < nr_pages; i++) { | |
8244 | if (!PageCompound(pages[i])) | |
8245 | continue; | |
8246 | if (compound_head(pages[i]) == hpage) | |
8247 | return true; | |
8248 | } | |
8249 | ||
8250 | /* check previously registered pages */ | |
8251 | for (i = 0; i < ctx->nr_user_bufs; i++) { | |
8252 | struct io_mapped_ubuf *imu = &ctx->user_bufs[i]; | |
8253 | ||
8254 | for (j = 0; j < imu->nr_bvecs; j++) { | |
8255 | if (!PageCompound(imu->bvec[j].bv_page)) | |
8256 | continue; | |
8257 | if (compound_head(imu->bvec[j].bv_page) == hpage) | |
8258 | return true; | |
8259 | } | |
8260 | } | |
8261 | ||
8262 | return false; | |
8263 | } | |
8264 | ||
8265 | static int io_buffer_account_pin(struct io_ring_ctx *ctx, struct page **pages, | |
8266 | int nr_pages, struct io_mapped_ubuf *imu, | |
8267 | struct page **last_hpage) | |
8268 | { | |
8269 | int i, ret; | |
8270 | ||
8271 | for (i = 0; i < nr_pages; i++) { | |
8272 | if (!PageCompound(pages[i])) { | |
8273 | imu->acct_pages++; | |
8274 | } else { | |
8275 | struct page *hpage; | |
8276 | ||
8277 | hpage = compound_head(pages[i]); | |
8278 | if (hpage == *last_hpage) | |
8279 | continue; | |
8280 | *last_hpage = hpage; | |
8281 | if (headpage_already_acct(ctx, pages, i, hpage)) | |
8282 | continue; | |
8283 | imu->acct_pages += page_size(hpage) >> PAGE_SHIFT; | |
8284 | } | |
8285 | } | |
8286 | ||
8287 | if (!imu->acct_pages) | |
8288 | return 0; | |
8289 | ||
8290 | ret = io_account_mem(ctx, imu->acct_pages, ACCT_PINNED); | |
8291 | if (ret) | |
8292 | imu->acct_pages = 0; | |
8293 | return ret; | |
8294 | } | |
8295 | ||
edafccee JA |
8296 | static int io_sqe_buffer_register(struct io_ring_ctx *ctx, void __user *arg, |
8297 | unsigned nr_args) | |
8298 | { | |
8299 | struct vm_area_struct **vmas = NULL; | |
8300 | struct page **pages = NULL; | |
de293938 | 8301 | struct page *last_hpage = NULL; |
edafccee JA |
8302 | int i, j, got_pages = 0; |
8303 | int ret = -EINVAL; | |
8304 | ||
8305 | if (ctx->user_bufs) | |
8306 | return -EBUSY; | |
8307 | if (!nr_args || nr_args > UIO_MAXIOV) | |
8308 | return -EINVAL; | |
8309 | ||
8310 | ctx->user_bufs = kcalloc(nr_args, sizeof(struct io_mapped_ubuf), | |
8311 | GFP_KERNEL); | |
8312 | if (!ctx->user_bufs) | |
8313 | return -ENOMEM; | |
8314 | ||
8315 | for (i = 0; i < nr_args; i++) { | |
8316 | struct io_mapped_ubuf *imu = &ctx->user_bufs[i]; | |
8317 | unsigned long off, start, end, ubuf; | |
8318 | int pret, nr_pages; | |
8319 | struct iovec iov; | |
8320 | size_t size; | |
8321 | ||
8322 | ret = io_copy_iov(ctx, &iov, arg, i); | |
8323 | if (ret) | |
a278682d | 8324 | goto err; |
edafccee JA |
8325 | |
8326 | /* | |
8327 | * Don't impose further limits on the size and buffer | |
8328 | * constraints here, we'll -EINVAL later when IO is | |
8329 | * submitted if they are wrong. | |
8330 | */ | |
8331 | ret = -EFAULT; | |
8332 | if (!iov.iov_base || !iov.iov_len) | |
8333 | goto err; | |
8334 | ||
8335 | /* arbitrary limit, but we need something */ | |
8336 | if (iov.iov_len > SZ_1G) | |
8337 | goto err; | |
8338 | ||
8339 | ubuf = (unsigned long) iov.iov_base; | |
8340 | end = (ubuf + iov.iov_len + PAGE_SIZE - 1) >> PAGE_SHIFT; | |
8341 | start = ubuf >> PAGE_SHIFT; | |
8342 | nr_pages = end - start; | |
8343 | ||
edafccee JA |
8344 | ret = 0; |
8345 | if (!pages || nr_pages > got_pages) { | |
a8c73c1a DE |
8346 | kvfree(vmas); |
8347 | kvfree(pages); | |
d4ef6475 | 8348 | pages = kvmalloc_array(nr_pages, sizeof(struct page *), |
edafccee | 8349 | GFP_KERNEL); |
d4ef6475 | 8350 | vmas = kvmalloc_array(nr_pages, |
edafccee JA |
8351 | sizeof(struct vm_area_struct *), |
8352 | GFP_KERNEL); | |
8353 | if (!pages || !vmas) { | |
8354 | ret = -ENOMEM; | |
edafccee JA |
8355 | goto err; |
8356 | } | |
8357 | got_pages = nr_pages; | |
8358 | } | |
8359 | ||
d4ef6475 | 8360 | imu->bvec = kvmalloc_array(nr_pages, sizeof(struct bio_vec), |
edafccee JA |
8361 | GFP_KERNEL); |
8362 | ret = -ENOMEM; | |
de293938 | 8363 | if (!imu->bvec) |
edafccee | 8364 | goto err; |
edafccee JA |
8365 | |
8366 | ret = 0; | |
d8ed45c5 | 8367 | mmap_read_lock(current->mm); |
2113b05d | 8368 | pret = pin_user_pages(ubuf, nr_pages, |
932f4a63 IW |
8369 | FOLL_WRITE | FOLL_LONGTERM, |
8370 | pages, vmas); | |
edafccee JA |
8371 | if (pret == nr_pages) { |
8372 | /* don't support file backed memory */ | |
8373 | for (j = 0; j < nr_pages; j++) { | |
8374 | struct vm_area_struct *vma = vmas[j]; | |
8375 | ||
8376 | if (vma->vm_file && | |
8377 | !is_file_hugepages(vma->vm_file)) { | |
8378 | ret = -EOPNOTSUPP; | |
8379 | break; | |
8380 | } | |
8381 | } | |
8382 | } else { | |
8383 | ret = pret < 0 ? pret : -EFAULT; | |
8384 | } | |
d8ed45c5 | 8385 | mmap_read_unlock(current->mm); |
edafccee JA |
8386 | if (ret) { |
8387 | /* | |
8388 | * if we did partial map, or found file backed vmas, | |
8389 | * release any pages we did get | |
8390 | */ | |
27c4d3a3 | 8391 | if (pret > 0) |
f1f6a7dd | 8392 | unpin_user_pages(pages, pret); |
de293938 JA |
8393 | kvfree(imu->bvec); |
8394 | goto err; | |
8395 | } | |
8396 | ||
8397 | ret = io_buffer_account_pin(ctx, pages, pret, imu, &last_hpage); | |
8398 | if (ret) { | |
8399 | unpin_user_pages(pages, pret); | |
d4ef6475 | 8400 | kvfree(imu->bvec); |
edafccee JA |
8401 | goto err; |
8402 | } | |
8403 | ||
8404 | off = ubuf & ~PAGE_MASK; | |
8405 | size = iov.iov_len; | |
8406 | for (j = 0; j < nr_pages; j++) { | |
8407 | size_t vec_len; | |
8408 | ||
8409 | vec_len = min_t(size_t, size, PAGE_SIZE - off); | |
8410 | imu->bvec[j].bv_page = pages[j]; | |
8411 | imu->bvec[j].bv_len = vec_len; | |
8412 | imu->bvec[j].bv_offset = off; | |
8413 | off = 0; | |
8414 | size -= vec_len; | |
8415 | } | |
8416 | /* store original address for later verification */ | |
8417 | imu->ubuf = ubuf; | |
8418 | imu->len = iov.iov_len; | |
8419 | imu->nr_bvecs = nr_pages; | |
8420 | ||
8421 | ctx->nr_user_bufs++; | |
8422 | } | |
d4ef6475 MR |
8423 | kvfree(pages); |
8424 | kvfree(vmas); | |
edafccee JA |
8425 | return 0; |
8426 | err: | |
d4ef6475 MR |
8427 | kvfree(pages); |
8428 | kvfree(vmas); | |
edafccee JA |
8429 | io_sqe_buffer_unregister(ctx); |
8430 | return ret; | |
8431 | } | |
8432 | ||
9b402849 JA |
8433 | static int io_eventfd_register(struct io_ring_ctx *ctx, void __user *arg) |
8434 | { | |
8435 | __s32 __user *fds = arg; | |
8436 | int fd; | |
8437 | ||
8438 | if (ctx->cq_ev_fd) | |
8439 | return -EBUSY; | |
8440 | ||
8441 | if (copy_from_user(&fd, fds, sizeof(*fds))) | |
8442 | return -EFAULT; | |
8443 | ||
8444 | ctx->cq_ev_fd = eventfd_ctx_fdget(fd); | |
8445 | if (IS_ERR(ctx->cq_ev_fd)) { | |
8446 | int ret = PTR_ERR(ctx->cq_ev_fd); | |
8447 | ctx->cq_ev_fd = NULL; | |
8448 | return ret; | |
8449 | } | |
8450 | ||
8451 | return 0; | |
8452 | } | |
8453 | ||
8454 | static int io_eventfd_unregister(struct io_ring_ctx *ctx) | |
8455 | { | |
8456 | if (ctx->cq_ev_fd) { | |
8457 | eventfd_ctx_put(ctx->cq_ev_fd); | |
8458 | ctx->cq_ev_fd = NULL; | |
8459 | return 0; | |
8460 | } | |
8461 | ||
8462 | return -ENXIO; | |
8463 | } | |
8464 | ||
5a2e745d JA |
8465 | static int __io_destroy_buffers(int id, void *p, void *data) |
8466 | { | |
8467 | struct io_ring_ctx *ctx = data; | |
8468 | struct io_buffer *buf = p; | |
8469 | ||
067524e9 | 8470 | __io_remove_buffers(ctx, buf, id, -1U); |
5a2e745d JA |
8471 | return 0; |
8472 | } | |
8473 | ||
8474 | static void io_destroy_buffers(struct io_ring_ctx *ctx) | |
8475 | { | |
8476 | idr_for_each(&ctx->io_buffer_idr, __io_destroy_buffers, ctx); | |
8477 | idr_destroy(&ctx->io_buffer_idr); | |
8478 | } | |
8479 | ||
2b188cc1 JA |
8480 | static void io_ring_ctx_free(struct io_ring_ctx *ctx) |
8481 | { | |
6b06314c | 8482 | io_finish_async(ctx); |
5dbcad51 | 8483 | io_sqe_buffer_unregister(ctx); |
2aede0e4 JA |
8484 | |
8485 | if (ctx->sqo_task) { | |
8486 | put_task_struct(ctx->sqo_task); | |
8487 | ctx->sqo_task = NULL; | |
8488 | mmdrop(ctx->mm_account); | |
8489 | ctx->mm_account = NULL; | |
30975825 | 8490 | } |
def596e9 | 8491 | |
91d8f519 DZ |
8492 | #ifdef CONFIG_BLK_CGROUP |
8493 | if (ctx->sqo_blkcg_css) | |
8494 | css_put(ctx->sqo_blkcg_css); | |
8495 | #endif | |
8496 | ||
6b06314c | 8497 | io_sqe_files_unregister(ctx); |
9b402849 | 8498 | io_eventfd_unregister(ctx); |
5a2e745d | 8499 | io_destroy_buffers(ctx); |
41726c9a | 8500 | idr_destroy(&ctx->personality_idr); |
def596e9 | 8501 | |
2b188cc1 | 8502 | #if defined(CONFIG_UNIX) |
355e8d26 EB |
8503 | if (ctx->ring_sock) { |
8504 | ctx->ring_sock->file = NULL; /* so that iput() is called */ | |
2b188cc1 | 8505 | sock_release(ctx->ring_sock); |
355e8d26 | 8506 | } |
2b188cc1 JA |
8507 | #endif |
8508 | ||
75b28aff | 8509 | io_mem_free(ctx->rings); |
2b188cc1 | 8510 | io_mem_free(ctx->sq_sqes); |
2b188cc1 JA |
8511 | |
8512 | percpu_ref_exit(&ctx->refs); | |
2b188cc1 | 8513 | free_uid(ctx->user); |
181e448d | 8514 | put_cred(ctx->creds); |
78076bb6 | 8515 | kfree(ctx->cancel_hash); |
0ddf92e8 | 8516 | kmem_cache_free(req_cachep, ctx->fallback_req); |
2b188cc1 JA |
8517 | kfree(ctx); |
8518 | } | |
8519 | ||
8520 | static __poll_t io_uring_poll(struct file *file, poll_table *wait) | |
8521 | { | |
8522 | struct io_ring_ctx *ctx = file->private_data; | |
8523 | __poll_t mask = 0; | |
8524 | ||
8525 | poll_wait(file, &ctx->cq_wait, wait); | |
4f7067c3 SB |
8526 | /* |
8527 | * synchronizes with barrier from wq_has_sleeper call in | |
8528 | * io_commit_cqring | |
8529 | */ | |
2b188cc1 | 8530 | smp_rmb(); |
90554200 | 8531 | if (!io_sqring_full(ctx)) |
2b188cc1 | 8532 | mask |= EPOLLOUT | EPOLLWRNORM; |
63e5d81f | 8533 | if (io_cqring_events(ctx, false)) |
2b188cc1 JA |
8534 | mask |= EPOLLIN | EPOLLRDNORM; |
8535 | ||
8536 | return mask; | |
8537 | } | |
8538 | ||
8539 | static int io_uring_fasync(int fd, struct file *file, int on) | |
8540 | { | |
8541 | struct io_ring_ctx *ctx = file->private_data; | |
8542 | ||
8543 | return fasync_helper(fd, file, on, &ctx->cq_fasync); | |
8544 | } | |
8545 | ||
071698e1 JA |
8546 | static int io_remove_personalities(int id, void *p, void *data) |
8547 | { | |
8548 | struct io_ring_ctx *ctx = data; | |
1e6fa521 | 8549 | struct io_identity *iod; |
071698e1 | 8550 | |
1e6fa521 JA |
8551 | iod = idr_remove(&ctx->personality_idr, id); |
8552 | if (iod) { | |
8553 | put_cred(iod->creds); | |
8554 | if (refcount_dec_and_test(&iod->count)) | |
8555 | kfree(iod); | |
8556 | } | |
071698e1 JA |
8557 | return 0; |
8558 | } | |
8559 | ||
85faa7b8 JA |
8560 | static void io_ring_exit_work(struct work_struct *work) |
8561 | { | |
b2edc0a7 PB |
8562 | struct io_ring_ctx *ctx = container_of(work, struct io_ring_ctx, |
8563 | exit_work); | |
85faa7b8 | 8564 | |
56952e91 JA |
8565 | /* |
8566 | * If we're doing polled IO and end up having requests being | |
8567 | * submitted async (out-of-line), then completions can come in while | |
8568 | * we're waiting for refs to drop. We need to reap these manually, | |
8569 | * as nobody else will be looking for them. | |
8570 | */ | |
b2edc0a7 | 8571 | do { |
56952e91 | 8572 | if (ctx->rings) |
e6c8aa9a | 8573 | io_cqring_overflow_flush(ctx, true, NULL, NULL); |
b2edc0a7 PB |
8574 | io_iopoll_try_reap_events(ctx); |
8575 | } while (!wait_for_completion_timeout(&ctx->ref_comp, HZ/20)); | |
85faa7b8 JA |
8576 | io_ring_ctx_free(ctx); |
8577 | } | |
8578 | ||
2b188cc1 JA |
8579 | static void io_ring_ctx_wait_and_kill(struct io_ring_ctx *ctx) |
8580 | { | |
8581 | mutex_lock(&ctx->uring_lock); | |
8582 | percpu_ref_kill(&ctx->refs); | |
8583 | mutex_unlock(&ctx->uring_lock); | |
8584 | ||
6b81928d PB |
8585 | io_kill_timeouts(ctx, NULL, NULL); |
8586 | io_poll_remove_all(ctx, NULL, NULL); | |
561fb04a JA |
8587 | |
8588 | if (ctx->io_wq) | |
8589 | io_wq_cancel_all(ctx->io_wq); | |
8590 | ||
15dff286 JA |
8591 | /* if we failed setting up the ctx, we might not have any rings */ |
8592 | if (ctx->rings) | |
e6c8aa9a | 8593 | io_cqring_overflow_flush(ctx, true, NULL, NULL); |
b2edc0a7 | 8594 | io_iopoll_try_reap_events(ctx); |
071698e1 | 8595 | idr_for_each(&ctx->personality_idr, io_remove_personalities, ctx); |
309fc03a JA |
8596 | |
8597 | /* | |
8598 | * Do this upfront, so we won't have a grace period where the ring | |
8599 | * is closed but resources aren't reaped yet. This can cause | |
8600 | * spurious failure in setting up a new ring. | |
8601 | */ | |
760618f7 JA |
8602 | io_unaccount_mem(ctx, ring_pages(ctx->sq_entries, ctx->cq_entries), |
8603 | ACCT_LOCKED); | |
309fc03a | 8604 | |
85faa7b8 | 8605 | INIT_WORK(&ctx->exit_work, io_ring_exit_work); |
fc666777 JA |
8606 | /* |
8607 | * Use system_unbound_wq to avoid spawning tons of event kworkers | |
8608 | * if we're exiting a ton of rings at the same time. It just adds | |
8609 | * noise and overhead, there's no discernable change in runtime | |
8610 | * over using system_wq. | |
8611 | */ | |
8612 | queue_work(system_unbound_wq, &ctx->exit_work); | |
2b188cc1 JA |
8613 | } |
8614 | ||
8615 | static int io_uring_release(struct inode *inode, struct file *file) | |
8616 | { | |
8617 | struct io_ring_ctx *ctx = file->private_data; | |
8618 | ||
8619 | file->private_data = NULL; | |
8620 | io_ring_ctx_wait_and_kill(ctx); | |
8621 | return 0; | |
8622 | } | |
8623 | ||
f6edbabb PB |
8624 | struct io_task_cancel { |
8625 | struct task_struct *task; | |
8626 | struct files_struct *files; | |
8627 | }; | |
f254ac04 | 8628 | |
f6edbabb | 8629 | static bool io_cancel_task_cb(struct io_wq_work *work, void *data) |
b711d4ea | 8630 | { |
9a472ef7 | 8631 | struct io_kiocb *req = container_of(work, struct io_kiocb, work); |
f6edbabb | 8632 | struct io_task_cancel *cancel = data; |
9a472ef7 PB |
8633 | bool ret; |
8634 | ||
f6edbabb | 8635 | if (cancel->files && (req->flags & REQ_F_LINK_TIMEOUT)) { |
9a472ef7 PB |
8636 | unsigned long flags; |
8637 | struct io_ring_ctx *ctx = req->ctx; | |
8638 | ||
8639 | /* protect against races with linked timeouts */ | |
8640 | spin_lock_irqsave(&ctx->completion_lock, flags); | |
f6edbabb | 8641 | ret = io_match_task(req, cancel->task, cancel->files); |
9a472ef7 PB |
8642 | spin_unlock_irqrestore(&ctx->completion_lock, flags); |
8643 | } else { | |
f6edbabb | 8644 | ret = io_match_task(req, cancel->task, cancel->files); |
9a472ef7 PB |
8645 | } |
8646 | return ret; | |
b711d4ea JA |
8647 | } |
8648 | ||
b7ddce3c | 8649 | static void io_cancel_defer_files(struct io_ring_ctx *ctx, |
ef9865a4 | 8650 | struct task_struct *task, |
b7ddce3c PB |
8651 | struct files_struct *files) |
8652 | { | |
8653 | struct io_defer_entry *de = NULL; | |
8654 | LIST_HEAD(list); | |
8655 | ||
8656 | spin_lock_irq(&ctx->completion_lock); | |
8657 | list_for_each_entry_reverse(de, &ctx->defer_list, list) { | |
08d23634 | 8658 | if (io_match_task(de->req, task, files)) { |
b7ddce3c PB |
8659 | list_cut_position(&list, &ctx->defer_list, &de->list); |
8660 | break; | |
8661 | } | |
8662 | } | |
8663 | spin_unlock_irq(&ctx->completion_lock); | |
8664 | ||
8665 | while (!list_empty(&list)) { | |
8666 | de = list_first_entry(&list, struct io_defer_entry, list); | |
8667 | list_del_init(&de->list); | |
8668 | req_set_fail_links(de->req); | |
8669 | io_put_req(de->req); | |
8670 | io_req_complete(de->req, -ECANCELED); | |
8671 | kfree(de); | |
8672 | } | |
8673 | } | |
8674 | ||
b52fda00 | 8675 | static void io_uring_cancel_files(struct io_ring_ctx *ctx, |
df9923f9 | 8676 | struct task_struct *task, |
fcb323cc JA |
8677 | struct files_struct *files) |
8678 | { | |
fcb323cc | 8679 | while (!list_empty_careful(&ctx->inflight_list)) { |
f6edbabb PB |
8680 | struct io_task_cancel cancel = { .task = task, .files = NULL, }; |
8681 | struct io_kiocb *req; | |
d8f1b971 | 8682 | DEFINE_WAIT(wait); |
f6edbabb | 8683 | bool found = false; |
fcb323cc JA |
8684 | |
8685 | spin_lock_irq(&ctx->inflight_lock); | |
8686 | list_for_each_entry(req, &ctx->inflight_list, inflight_entry) { | |
df9923f9 PB |
8687 | if (req->task == task && |
8688 | (req->work.flags & IO_WQ_WORK_FILES) && | |
98447d65 | 8689 | req->work.identity->files != files) |
768134d4 | 8690 | continue; |
f6edbabb | 8691 | found = true; |
768134d4 | 8692 | break; |
fcb323cc | 8693 | } |
f6edbabb | 8694 | if (found) |
c98de08c PB |
8695 | prepare_to_wait(&task->io_uring->wait, &wait, |
8696 | TASK_UNINTERRUPTIBLE); | |
fcb323cc JA |
8697 | spin_unlock_irq(&ctx->inflight_lock); |
8698 | ||
768134d4 | 8699 | /* We need to keep going until we don't find a matching req */ |
f6edbabb | 8700 | if (!found) |
fcb323cc | 8701 | break; |
f6edbabb PB |
8702 | |
8703 | io_wq_cancel_cb(ctx->io_wq, io_cancel_task_cb, &cancel, true); | |
8704 | io_poll_remove_all(ctx, task, files); | |
8705 | io_kill_timeouts(ctx, task, files); | |
6200b0ae JA |
8706 | /* cancellations _may_ trigger task work */ |
8707 | io_run_task_work(); | |
fcb323cc | 8708 | schedule(); |
c98de08c | 8709 | finish_wait(&task->io_uring->wait, &wait); |
fcb323cc JA |
8710 | } |
8711 | } | |
8712 | ||
b52fda00 PB |
8713 | static void __io_uring_cancel_task_requests(struct io_ring_ctx *ctx, |
8714 | struct task_struct *task) | |
0f212204 | 8715 | { |
b52fda00 | 8716 | while (1) { |
f6edbabb | 8717 | struct io_task_cancel cancel = { .task = task, .files = NULL, }; |
0f212204 | 8718 | enum io_wq_cancel cret; |
b52fda00 | 8719 | bool ret = false; |
0f212204 | 8720 | |
f6edbabb | 8721 | cret = io_wq_cancel_cb(ctx->io_wq, io_cancel_task_cb, &cancel, true); |
0f212204 JA |
8722 | if (cret != IO_WQ_CANCEL_NOTFOUND) |
8723 | ret = true; | |
8724 | ||
8725 | /* SQPOLL thread does its own polling */ | |
8726 | if (!(ctx->flags & IORING_SETUP_SQPOLL)) { | |
8727 | while (!list_empty_careful(&ctx->iopoll_list)) { | |
8728 | io_iopoll_try_reap_events(ctx); | |
8729 | ret = true; | |
8730 | } | |
8731 | } | |
8732 | ||
6b81928d PB |
8733 | ret |= io_poll_remove_all(ctx, task, NULL); |
8734 | ret |= io_kill_timeouts(ctx, task, NULL); | |
b52fda00 PB |
8735 | if (!ret) |
8736 | break; | |
8737 | io_run_task_work(); | |
8738 | cond_resched(); | |
0f212204 | 8739 | } |
0f212204 JA |
8740 | } |
8741 | ||
8742 | /* | |
8743 | * We need to iteratively cancel requests, in case a request has dependent | |
8744 | * hard links. These persist even for failure of cancelations, hence keep | |
8745 | * looping until none are found. | |
8746 | */ | |
8747 | static void io_uring_cancel_task_requests(struct io_ring_ctx *ctx, | |
8748 | struct files_struct *files) | |
8749 | { | |
8750 | struct task_struct *task = current; | |
8751 | ||
fdaf083c | 8752 | if ((ctx->flags & IORING_SETUP_SQPOLL) && ctx->sq_data) { |
534ca6d6 | 8753 | task = ctx->sq_data->thread; |
fdaf083c JA |
8754 | atomic_inc(&task->io_uring->in_idle); |
8755 | io_sq_thread_park(ctx->sq_data); | |
8756 | } | |
0f212204 | 8757 | |
df9923f9 | 8758 | io_cancel_defer_files(ctx, task, files); |
0f212204 | 8759 | io_cqring_overflow_flush(ctx, true, task, files); |
b52fda00 | 8760 | io_uring_cancel_files(ctx, task, files); |
0f212204 | 8761 | |
b52fda00 PB |
8762 | if (!files) |
8763 | __io_uring_cancel_task_requests(ctx, task); | |
fdaf083c JA |
8764 | |
8765 | if ((ctx->flags & IORING_SETUP_SQPOLL) && ctx->sq_data) { | |
8766 | atomic_dec(&task->io_uring->in_idle); | |
8767 | /* | |
8768 | * If the files that are going away are the ones in the thread | |
8769 | * identity, clear them out. | |
8770 | */ | |
8771 | if (task->io_uring->identity->files == files) | |
8772 | task->io_uring->identity->files = NULL; | |
8773 | io_sq_thread_unpark(ctx->sq_data); | |
8774 | } | |
0f212204 JA |
8775 | } |
8776 | ||
8777 | /* | |
8778 | * Note that this task has used io_uring. We use it for cancelation purposes. | |
8779 | */ | |
fdaf083c | 8780 | static int io_uring_add_task_file(struct io_ring_ctx *ctx, struct file *file) |
0f212204 | 8781 | { |
236434c3 MWO |
8782 | struct io_uring_task *tctx = current->io_uring; |
8783 | ||
8784 | if (unlikely(!tctx)) { | |
0f212204 JA |
8785 | int ret; |
8786 | ||
8787 | ret = io_uring_alloc_task_context(current); | |
8788 | if (unlikely(ret)) | |
8789 | return ret; | |
236434c3 | 8790 | tctx = current->io_uring; |
0f212204 | 8791 | } |
236434c3 MWO |
8792 | if (tctx->last != file) { |
8793 | void *old = xa_load(&tctx->xa, (unsigned long)file); | |
0f212204 | 8794 | |
236434c3 | 8795 | if (!old) { |
0f212204 | 8796 | get_file(file); |
236434c3 | 8797 | xa_store(&tctx->xa, (unsigned long)file, file, GFP_KERNEL); |
0f212204 | 8798 | } |
236434c3 | 8799 | tctx->last = file; |
0f212204 JA |
8800 | } |
8801 | ||
fdaf083c JA |
8802 | /* |
8803 | * This is race safe in that the task itself is doing this, hence it | |
8804 | * cannot be going through the exit/cancel paths at the same time. | |
8805 | * This cannot be modified while exit/cancel is running. | |
8806 | */ | |
8807 | if (!tctx->sqpoll && (ctx->flags & IORING_SETUP_SQPOLL)) | |
8808 | tctx->sqpoll = true; | |
8809 | ||
0f212204 JA |
8810 | return 0; |
8811 | } | |
8812 | ||
8813 | /* | |
8814 | * Remove this io_uring_file -> task mapping. | |
8815 | */ | |
8816 | static void io_uring_del_task_file(struct file *file) | |
8817 | { | |
8818 | struct io_uring_task *tctx = current->io_uring; | |
0f212204 JA |
8819 | |
8820 | if (tctx->last == file) | |
8821 | tctx->last = NULL; | |
5e2ed8c4 | 8822 | file = xa_erase(&tctx->xa, (unsigned long)file); |
0f212204 JA |
8823 | if (file) |
8824 | fput(file); | |
8825 | } | |
8826 | ||
0f212204 JA |
8827 | /* |
8828 | * Drop task note for this file if we're the only ones that hold it after | |
8829 | * pending fput() | |
8830 | */ | |
c8fb20b5 | 8831 | static void io_uring_attempt_task_drop(struct file *file) |
0f212204 JA |
8832 | { |
8833 | if (!current->io_uring) | |
8834 | return; | |
8835 | /* | |
8836 | * fput() is pending, will be 2 if the only other ref is our potential | |
8837 | * task file note. If the task is exiting, drop regardless of count. | |
8838 | */ | |
c8fb20b5 PB |
8839 | if (fatal_signal_pending(current) || (current->flags & PF_EXITING) || |
8840 | atomic_long_read(&file->f_count) == 2) | |
8841 | io_uring_del_task_file(file); | |
0f212204 JA |
8842 | } |
8843 | ||
8844 | void __io_uring_files_cancel(struct files_struct *files) | |
8845 | { | |
8846 | struct io_uring_task *tctx = current->io_uring; | |
ce765372 MWO |
8847 | struct file *file; |
8848 | unsigned long index; | |
0f212204 JA |
8849 | |
8850 | /* make sure overflow events are dropped */ | |
fdaf083c | 8851 | atomic_inc(&tctx->in_idle); |
0f212204 | 8852 | |
ce765372 MWO |
8853 | xa_for_each(&tctx->xa, index, file) { |
8854 | struct io_ring_ctx *ctx = file->private_data; | |
0f212204 JA |
8855 | |
8856 | io_uring_cancel_task_requests(ctx, files); | |
8857 | if (files) | |
8858 | io_uring_del_task_file(file); | |
ce765372 | 8859 | } |
fdaf083c JA |
8860 | |
8861 | atomic_dec(&tctx->in_idle); | |
8862 | } | |
8863 | ||
8864 | static s64 tctx_inflight(struct io_uring_task *tctx) | |
8865 | { | |
8866 | unsigned long index; | |
8867 | struct file *file; | |
8868 | s64 inflight; | |
8869 | ||
8870 | inflight = percpu_counter_sum(&tctx->inflight); | |
8871 | if (!tctx->sqpoll) | |
8872 | return inflight; | |
8873 | ||
8874 | /* | |
8875 | * If we have SQPOLL rings, then we need to iterate and find them, and | |
8876 | * add the pending count for those. | |
8877 | */ | |
8878 | xa_for_each(&tctx->xa, index, file) { | |
8879 | struct io_ring_ctx *ctx = file->private_data; | |
8880 | ||
8881 | if (ctx->flags & IORING_SETUP_SQPOLL) { | |
8882 | struct io_uring_task *__tctx = ctx->sqo_task->io_uring; | |
8883 | ||
8884 | inflight += percpu_counter_sum(&__tctx->inflight); | |
8885 | } | |
8886 | } | |
8887 | ||
8888 | return inflight; | |
0f212204 JA |
8889 | } |
8890 | ||
0f212204 JA |
8891 | /* |
8892 | * Find any io_uring fd that this task has registered or done IO on, and cancel | |
8893 | * requests. | |
8894 | */ | |
8895 | void __io_uring_task_cancel(void) | |
8896 | { | |
8897 | struct io_uring_task *tctx = current->io_uring; | |
8898 | DEFINE_WAIT(wait); | |
d8a6df10 | 8899 | s64 inflight; |
0f212204 JA |
8900 | |
8901 | /* make sure overflow events are dropped */ | |
fdaf083c | 8902 | atomic_inc(&tctx->in_idle); |
0f212204 | 8903 | |
d8a6df10 | 8904 | do { |
0f212204 | 8905 | /* read completions before cancelations */ |
fdaf083c | 8906 | inflight = tctx_inflight(tctx); |
d8a6df10 JA |
8907 | if (!inflight) |
8908 | break; | |
0f212204 JA |
8909 | __io_uring_files_cancel(NULL); |
8910 | ||
8911 | prepare_to_wait(&tctx->wait, &wait, TASK_UNINTERRUPTIBLE); | |
8912 | ||
8913 | /* | |
8914 | * If we've seen completions, retry. This avoids a race where | |
8915 | * a completion comes in before we did prepare_to_wait(). | |
8916 | */ | |
fdaf083c | 8917 | if (inflight != tctx_inflight(tctx)) |
0f212204 | 8918 | continue; |
0f212204 | 8919 | schedule(); |
d8a6df10 | 8920 | } while (1); |
0f212204 JA |
8921 | |
8922 | finish_wait(&tctx->wait, &wait); | |
fdaf083c | 8923 | atomic_dec(&tctx->in_idle); |
44e728b8 PB |
8924 | } |
8925 | ||
fcb323cc JA |
8926 | static int io_uring_flush(struct file *file, void *data) |
8927 | { | |
c8fb20b5 | 8928 | io_uring_attempt_task_drop(file); |
fcb323cc JA |
8929 | return 0; |
8930 | } | |
8931 | ||
6c5c240e RP |
8932 | static void *io_uring_validate_mmap_request(struct file *file, |
8933 | loff_t pgoff, size_t sz) | |
2b188cc1 | 8934 | { |
2b188cc1 | 8935 | struct io_ring_ctx *ctx = file->private_data; |
6c5c240e | 8936 | loff_t offset = pgoff << PAGE_SHIFT; |
2b188cc1 JA |
8937 | struct page *page; |
8938 | void *ptr; | |
8939 | ||
8940 | switch (offset) { | |
8941 | case IORING_OFF_SQ_RING: | |
75b28aff HV |
8942 | case IORING_OFF_CQ_RING: |
8943 | ptr = ctx->rings; | |
2b188cc1 JA |
8944 | break; |
8945 | case IORING_OFF_SQES: | |
8946 | ptr = ctx->sq_sqes; | |
8947 | break; | |
2b188cc1 | 8948 | default: |
6c5c240e | 8949 | return ERR_PTR(-EINVAL); |
2b188cc1 JA |
8950 | } |
8951 | ||
8952 | page = virt_to_head_page(ptr); | |
a50b854e | 8953 | if (sz > page_size(page)) |
6c5c240e RP |
8954 | return ERR_PTR(-EINVAL); |
8955 | ||
8956 | return ptr; | |
8957 | } | |
8958 | ||
8959 | #ifdef CONFIG_MMU | |
8960 | ||
8961 | static int io_uring_mmap(struct file *file, struct vm_area_struct *vma) | |
8962 | { | |
8963 | size_t sz = vma->vm_end - vma->vm_start; | |
8964 | unsigned long pfn; | |
8965 | void *ptr; | |
8966 | ||
8967 | ptr = io_uring_validate_mmap_request(file, vma->vm_pgoff, sz); | |
8968 | if (IS_ERR(ptr)) | |
8969 | return PTR_ERR(ptr); | |
2b188cc1 JA |
8970 | |
8971 | pfn = virt_to_phys(ptr) >> PAGE_SHIFT; | |
8972 | return remap_pfn_range(vma, vma->vm_start, pfn, sz, vma->vm_page_prot); | |
8973 | } | |
8974 | ||
6c5c240e RP |
8975 | #else /* !CONFIG_MMU */ |
8976 | ||
8977 | static int io_uring_mmap(struct file *file, struct vm_area_struct *vma) | |
8978 | { | |
8979 | return vma->vm_flags & (VM_SHARED | VM_MAYSHARE) ? 0 : -EINVAL; | |
8980 | } | |
8981 | ||
8982 | static unsigned int io_uring_nommu_mmap_capabilities(struct file *file) | |
8983 | { | |
8984 | return NOMMU_MAP_DIRECT | NOMMU_MAP_READ | NOMMU_MAP_WRITE; | |
8985 | } | |
8986 | ||
8987 | static unsigned long io_uring_nommu_get_unmapped_area(struct file *file, | |
8988 | unsigned long addr, unsigned long len, | |
8989 | unsigned long pgoff, unsigned long flags) | |
8990 | { | |
8991 | void *ptr; | |
8992 | ||
8993 | ptr = io_uring_validate_mmap_request(file, pgoff, len); | |
8994 | if (IS_ERR(ptr)) | |
8995 | return PTR_ERR(ptr); | |
8996 | ||
8997 | return (unsigned long) ptr; | |
8998 | } | |
8999 | ||
9000 | #endif /* !CONFIG_MMU */ | |
9001 | ||
90554200 JA |
9002 | static void io_sqpoll_wait_sq(struct io_ring_ctx *ctx) |
9003 | { | |
9004 | DEFINE_WAIT(wait); | |
9005 | ||
9006 | do { | |
9007 | if (!io_sqring_full(ctx)) | |
9008 | break; | |
9009 | ||
9010 | prepare_to_wait(&ctx->sqo_sq_wait, &wait, TASK_INTERRUPTIBLE); | |
9011 | ||
9012 | if (!io_sqring_full(ctx)) | |
9013 | break; | |
9014 | ||
9015 | schedule(); | |
9016 | } while (!signal_pending(current)); | |
9017 | ||
9018 | finish_wait(&ctx->sqo_sq_wait, &wait); | |
9019 | } | |
9020 | ||
c73ebb68 HX |
9021 | static int io_get_ext_arg(unsigned flags, const void __user *argp, size_t *argsz, |
9022 | struct __kernel_timespec __user **ts, | |
9023 | const sigset_t __user **sig) | |
9024 | { | |
9025 | struct io_uring_getevents_arg arg; | |
9026 | ||
9027 | /* | |
9028 | * If EXT_ARG isn't set, then we have no timespec and the argp pointer | |
9029 | * is just a pointer to the sigset_t. | |
9030 | */ | |
9031 | if (!(flags & IORING_ENTER_EXT_ARG)) { | |
9032 | *sig = (const sigset_t __user *) argp; | |
9033 | *ts = NULL; | |
9034 | return 0; | |
9035 | } | |
9036 | ||
9037 | /* | |
9038 | * EXT_ARG is set - ensure we agree on the size of it and copy in our | |
9039 | * timespec and sigset_t pointers if good. | |
9040 | */ | |
9041 | if (*argsz != sizeof(arg)) | |
9042 | return -EINVAL; | |
9043 | if (copy_from_user(&arg, argp, sizeof(arg))) | |
9044 | return -EFAULT; | |
9045 | *sig = u64_to_user_ptr(arg.sigmask); | |
9046 | *argsz = arg.sigmask_sz; | |
9047 | *ts = u64_to_user_ptr(arg.ts); | |
9048 | return 0; | |
9049 | } | |
9050 | ||
2b188cc1 | 9051 | SYSCALL_DEFINE6(io_uring_enter, unsigned int, fd, u32, to_submit, |
c73ebb68 HX |
9052 | u32, min_complete, u32, flags, const void __user *, argp, |
9053 | size_t, argsz) | |
2b188cc1 JA |
9054 | { |
9055 | struct io_ring_ctx *ctx; | |
9056 | long ret = -EBADF; | |
9057 | int submitted = 0; | |
9058 | struct fd f; | |
9059 | ||
4c6e277c | 9060 | io_run_task_work(); |
b41e9852 | 9061 | |
90554200 | 9062 | if (flags & ~(IORING_ENTER_GETEVENTS | IORING_ENTER_SQ_WAKEUP | |
c73ebb68 | 9063 | IORING_ENTER_SQ_WAIT | IORING_ENTER_EXT_ARG)) |
2b188cc1 JA |
9064 | return -EINVAL; |
9065 | ||
9066 | f = fdget(fd); | |
9067 | if (!f.file) | |
9068 | return -EBADF; | |
9069 | ||
9070 | ret = -EOPNOTSUPP; | |
9071 | if (f.file->f_op != &io_uring_fops) | |
9072 | goto out_fput; | |
9073 | ||
9074 | ret = -ENXIO; | |
9075 | ctx = f.file->private_data; | |
9076 | if (!percpu_ref_tryget(&ctx->refs)) | |
9077 | goto out_fput; | |
9078 | ||
7e84e1c7 SG |
9079 | ret = -EBADFD; |
9080 | if (ctx->flags & IORING_SETUP_R_DISABLED) | |
9081 | goto out; | |
9082 | ||
6c271ce2 JA |
9083 | /* |
9084 | * For SQ polling, the thread will do all submissions and completions. | |
9085 | * Just return the requested submit count, and wake the thread if | |
9086 | * we were asked to. | |
9087 | */ | |
b2a9eada | 9088 | ret = 0; |
6c271ce2 | 9089 | if (ctx->flags & IORING_SETUP_SQPOLL) { |
c1edbf5f | 9090 | if (!list_empty_careful(&ctx->cq_overflow_list)) |
e6c8aa9a | 9091 | io_cqring_overflow_flush(ctx, false, NULL, NULL); |
6c271ce2 | 9092 | if (flags & IORING_ENTER_SQ_WAKEUP) |
534ca6d6 | 9093 | wake_up(&ctx->sq_data->wait); |
90554200 JA |
9094 | if (flags & IORING_ENTER_SQ_WAIT) |
9095 | io_sqpoll_wait_sq(ctx); | |
6c271ce2 | 9096 | submitted = to_submit; |
b2a9eada | 9097 | } else if (to_submit) { |
fdaf083c | 9098 | ret = io_uring_add_task_file(ctx, f.file); |
0f212204 JA |
9099 | if (unlikely(ret)) |
9100 | goto out; | |
2b188cc1 | 9101 | mutex_lock(&ctx->uring_lock); |
0f212204 | 9102 | submitted = io_submit_sqes(ctx, to_submit); |
2b188cc1 | 9103 | mutex_unlock(&ctx->uring_lock); |
7c504e65 PB |
9104 | |
9105 | if (submitted != to_submit) | |
9106 | goto out; | |
2b188cc1 JA |
9107 | } |
9108 | if (flags & IORING_ENTER_GETEVENTS) { | |
c73ebb68 HX |
9109 | const sigset_t __user *sig; |
9110 | struct __kernel_timespec __user *ts; | |
9111 | ||
9112 | ret = io_get_ext_arg(flags, argp, &argsz, &ts, &sig); | |
9113 | if (unlikely(ret)) | |
9114 | goto out; | |
9115 | ||
2b188cc1 JA |
9116 | min_complete = min(min_complete, ctx->cq_entries); |
9117 | ||
32b2244a XW |
9118 | /* |
9119 | * When SETUP_IOPOLL and SETUP_SQPOLL are both enabled, user | |
9120 | * space applications don't need to do io completion events | |
9121 | * polling again, they can rely on io_sq_thread to do polling | |
9122 | * work, which can reduce cpu usage and uring_lock contention. | |
9123 | */ | |
9124 | if (ctx->flags & IORING_SETUP_IOPOLL && | |
9125 | !(ctx->flags & IORING_SETUP_SQPOLL)) { | |
7668b92a | 9126 | ret = io_iopoll_check(ctx, min_complete); |
def596e9 | 9127 | } else { |
c73ebb68 | 9128 | ret = io_cqring_wait(ctx, min_complete, sig, argsz, ts); |
def596e9 | 9129 | } |
2b188cc1 JA |
9130 | } |
9131 | ||
7c504e65 | 9132 | out: |
6805b32e | 9133 | percpu_ref_put(&ctx->refs); |
2b188cc1 JA |
9134 | out_fput: |
9135 | fdput(f); | |
9136 | return submitted ? submitted : ret; | |
9137 | } | |
9138 | ||
bebdb65e | 9139 | #ifdef CONFIG_PROC_FS |
87ce955b JA |
9140 | static int io_uring_show_cred(int id, void *p, void *data) |
9141 | { | |
6b47ab81 JA |
9142 | struct io_identity *iod = p; |
9143 | const struct cred *cred = iod->creds; | |
87ce955b JA |
9144 | struct seq_file *m = data; |
9145 | struct user_namespace *uns = seq_user_ns(m); | |
9146 | struct group_info *gi; | |
9147 | kernel_cap_t cap; | |
9148 | unsigned __capi; | |
9149 | int g; | |
9150 | ||
9151 | seq_printf(m, "%5d\n", id); | |
9152 | seq_put_decimal_ull(m, "\tUid:\t", from_kuid_munged(uns, cred->uid)); | |
9153 | seq_put_decimal_ull(m, "\t\t", from_kuid_munged(uns, cred->euid)); | |
9154 | seq_put_decimal_ull(m, "\t\t", from_kuid_munged(uns, cred->suid)); | |
9155 | seq_put_decimal_ull(m, "\t\t", from_kuid_munged(uns, cred->fsuid)); | |
9156 | seq_put_decimal_ull(m, "\n\tGid:\t", from_kgid_munged(uns, cred->gid)); | |
9157 | seq_put_decimal_ull(m, "\t\t", from_kgid_munged(uns, cred->egid)); | |
9158 | seq_put_decimal_ull(m, "\t\t", from_kgid_munged(uns, cred->sgid)); | |
9159 | seq_put_decimal_ull(m, "\t\t", from_kgid_munged(uns, cred->fsgid)); | |
9160 | seq_puts(m, "\n\tGroups:\t"); | |
9161 | gi = cred->group_info; | |
9162 | for (g = 0; g < gi->ngroups; g++) { | |
9163 | seq_put_decimal_ull(m, g ? " " : "", | |
9164 | from_kgid_munged(uns, gi->gid[g])); | |
9165 | } | |
9166 | seq_puts(m, "\n\tCapEff:\t"); | |
9167 | cap = cred->cap_effective; | |
9168 | CAP_FOR_EACH_U32(__capi) | |
9169 | seq_put_hex_ll(m, NULL, cap.cap[CAP_LAST_U32 - __capi], 8); | |
9170 | seq_putc(m, '\n'); | |
9171 | return 0; | |
9172 | } | |
9173 | ||
9174 | static void __io_uring_show_fdinfo(struct io_ring_ctx *ctx, struct seq_file *m) | |
9175 | { | |
dbbe9c64 | 9176 | struct io_sq_data *sq = NULL; |
fad8e0de | 9177 | bool has_lock; |
87ce955b JA |
9178 | int i; |
9179 | ||
fad8e0de JA |
9180 | /* |
9181 | * Avoid ABBA deadlock between the seq lock and the io_uring mutex, | |
9182 | * since fdinfo case grabs it in the opposite direction of normal use | |
9183 | * cases. If we fail to get the lock, we just don't iterate any | |
9184 | * structures that could be going away outside the io_uring mutex. | |
9185 | */ | |
9186 | has_lock = mutex_trylock(&ctx->uring_lock); | |
9187 | ||
dbbe9c64 JQ |
9188 | if (has_lock && (ctx->flags & IORING_SETUP_SQPOLL)) |
9189 | sq = ctx->sq_data; | |
9190 | ||
9191 | seq_printf(m, "SqThread:\t%d\n", sq ? task_pid_nr(sq->thread) : -1); | |
9192 | seq_printf(m, "SqThreadCpu:\t%d\n", sq ? task_cpu(sq->thread) : -1); | |
87ce955b | 9193 | seq_printf(m, "UserFiles:\t%u\n", ctx->nr_user_files); |
fad8e0de | 9194 | for (i = 0; has_lock && i < ctx->nr_user_files; i++) { |
87ce955b JA |
9195 | struct fixed_file_table *table; |
9196 | struct file *f; | |
9197 | ||
9198 | table = &ctx->file_data->table[i >> IORING_FILE_TABLE_SHIFT]; | |
9199 | f = table->files[i & IORING_FILE_TABLE_MASK]; | |
9200 | if (f) | |
9201 | seq_printf(m, "%5u: %s\n", i, file_dentry(f)->d_iname); | |
9202 | else | |
9203 | seq_printf(m, "%5u: <none>\n", i); | |
9204 | } | |
9205 | seq_printf(m, "UserBufs:\t%u\n", ctx->nr_user_bufs); | |
fad8e0de | 9206 | for (i = 0; has_lock && i < ctx->nr_user_bufs; i++) { |
87ce955b JA |
9207 | struct io_mapped_ubuf *buf = &ctx->user_bufs[i]; |
9208 | ||
9209 | seq_printf(m, "%5u: 0x%llx/%u\n", i, buf->ubuf, | |
9210 | (unsigned int) buf->len); | |
9211 | } | |
fad8e0de | 9212 | if (has_lock && !idr_is_empty(&ctx->personality_idr)) { |
87ce955b JA |
9213 | seq_printf(m, "Personalities:\n"); |
9214 | idr_for_each(&ctx->personality_idr, io_uring_show_cred, m); | |
9215 | } | |
d7718a9d JA |
9216 | seq_printf(m, "PollList:\n"); |
9217 | spin_lock_irq(&ctx->completion_lock); | |
9218 | for (i = 0; i < (1U << ctx->cancel_hash_bits); i++) { | |
9219 | struct hlist_head *list = &ctx->cancel_hash[i]; | |
9220 | struct io_kiocb *req; | |
9221 | ||
9222 | hlist_for_each_entry(req, list, hash_node) | |
9223 | seq_printf(m, " op=%d, task_works=%d\n", req->opcode, | |
9224 | req->task->task_works != NULL); | |
9225 | } | |
9226 | spin_unlock_irq(&ctx->completion_lock); | |
fad8e0de JA |
9227 | if (has_lock) |
9228 | mutex_unlock(&ctx->uring_lock); | |
87ce955b JA |
9229 | } |
9230 | ||
9231 | static void io_uring_show_fdinfo(struct seq_file *m, struct file *f) | |
9232 | { | |
9233 | struct io_ring_ctx *ctx = f->private_data; | |
9234 | ||
9235 | if (percpu_ref_tryget(&ctx->refs)) { | |
9236 | __io_uring_show_fdinfo(ctx, m); | |
9237 | percpu_ref_put(&ctx->refs); | |
9238 | } | |
9239 | } | |
bebdb65e | 9240 | #endif |
87ce955b | 9241 | |
2b188cc1 JA |
9242 | static const struct file_operations io_uring_fops = { |
9243 | .release = io_uring_release, | |
fcb323cc | 9244 | .flush = io_uring_flush, |
2b188cc1 | 9245 | .mmap = io_uring_mmap, |
6c5c240e RP |
9246 | #ifndef CONFIG_MMU |
9247 | .get_unmapped_area = io_uring_nommu_get_unmapped_area, | |
9248 | .mmap_capabilities = io_uring_nommu_mmap_capabilities, | |
9249 | #endif | |
2b188cc1 JA |
9250 | .poll = io_uring_poll, |
9251 | .fasync = io_uring_fasync, | |
bebdb65e | 9252 | #ifdef CONFIG_PROC_FS |
87ce955b | 9253 | .show_fdinfo = io_uring_show_fdinfo, |
bebdb65e | 9254 | #endif |
2b188cc1 JA |
9255 | }; |
9256 | ||
9257 | static int io_allocate_scq_urings(struct io_ring_ctx *ctx, | |
9258 | struct io_uring_params *p) | |
9259 | { | |
75b28aff HV |
9260 | struct io_rings *rings; |
9261 | size_t size, sq_array_offset; | |
2b188cc1 | 9262 | |
bd740481 JA |
9263 | /* make sure these are sane, as we already accounted them */ |
9264 | ctx->sq_entries = p->sq_entries; | |
9265 | ctx->cq_entries = p->cq_entries; | |
9266 | ||
75b28aff HV |
9267 | size = rings_size(p->sq_entries, p->cq_entries, &sq_array_offset); |
9268 | if (size == SIZE_MAX) | |
9269 | return -EOVERFLOW; | |
9270 | ||
9271 | rings = io_mem_alloc(size); | |
9272 | if (!rings) | |
2b188cc1 JA |
9273 | return -ENOMEM; |
9274 | ||
75b28aff HV |
9275 | ctx->rings = rings; |
9276 | ctx->sq_array = (u32 *)((char *)rings + sq_array_offset); | |
9277 | rings->sq_ring_mask = p->sq_entries - 1; | |
9278 | rings->cq_ring_mask = p->cq_entries - 1; | |
9279 | rings->sq_ring_entries = p->sq_entries; | |
9280 | rings->cq_ring_entries = p->cq_entries; | |
9281 | ctx->sq_mask = rings->sq_ring_mask; | |
9282 | ctx->cq_mask = rings->cq_ring_mask; | |
2b188cc1 JA |
9283 | |
9284 | size = array_size(sizeof(struct io_uring_sqe), p->sq_entries); | |
eb065d30 JA |
9285 | if (size == SIZE_MAX) { |
9286 | io_mem_free(ctx->rings); | |
9287 | ctx->rings = NULL; | |
2b188cc1 | 9288 | return -EOVERFLOW; |
eb065d30 | 9289 | } |
2b188cc1 JA |
9290 | |
9291 | ctx->sq_sqes = io_mem_alloc(size); | |
eb065d30 JA |
9292 | if (!ctx->sq_sqes) { |
9293 | io_mem_free(ctx->rings); | |
9294 | ctx->rings = NULL; | |
2b188cc1 | 9295 | return -ENOMEM; |
eb065d30 | 9296 | } |
2b188cc1 | 9297 | |
2b188cc1 JA |
9298 | return 0; |
9299 | } | |
9300 | ||
9301 | /* | |
9302 | * Allocate an anonymous fd, this is what constitutes the application | |
9303 | * visible backing of an io_uring instance. The application mmaps this | |
9304 | * fd to gain access to the SQ/CQ ring details. If UNIX sockets are enabled, | |
9305 | * we have to tie this fd to a socket for file garbage collection purposes. | |
9306 | */ | |
9307 | static int io_uring_get_fd(struct io_ring_ctx *ctx) | |
9308 | { | |
9309 | struct file *file; | |
9310 | int ret; | |
9311 | ||
9312 | #if defined(CONFIG_UNIX) | |
9313 | ret = sock_create_kern(&init_net, PF_UNIX, SOCK_RAW, IPPROTO_IP, | |
9314 | &ctx->ring_sock); | |
9315 | if (ret) | |
9316 | return ret; | |
9317 | #endif | |
9318 | ||
9319 | ret = get_unused_fd_flags(O_RDWR | O_CLOEXEC); | |
9320 | if (ret < 0) | |
9321 | goto err; | |
9322 | ||
9323 | file = anon_inode_getfile("[io_uring]", &io_uring_fops, ctx, | |
9324 | O_RDWR | O_CLOEXEC); | |
9325 | if (IS_ERR(file)) { | |
0f212204 | 9326 | err_fd: |
2b188cc1 JA |
9327 | put_unused_fd(ret); |
9328 | ret = PTR_ERR(file); | |
9329 | goto err; | |
9330 | } | |
9331 | ||
9332 | #if defined(CONFIG_UNIX) | |
9333 | ctx->ring_sock->file = file; | |
9334 | #endif | |
fdaf083c | 9335 | if (unlikely(io_uring_add_task_file(ctx, file))) { |
0f212204 JA |
9336 | file = ERR_PTR(-ENOMEM); |
9337 | goto err_fd; | |
9338 | } | |
2b188cc1 JA |
9339 | fd_install(ret, file); |
9340 | return ret; | |
9341 | err: | |
9342 | #if defined(CONFIG_UNIX) | |
9343 | sock_release(ctx->ring_sock); | |
9344 | ctx->ring_sock = NULL; | |
9345 | #endif | |
9346 | return ret; | |
9347 | } | |
9348 | ||
7f13657d XW |
9349 | static int io_uring_create(unsigned entries, struct io_uring_params *p, |
9350 | struct io_uring_params __user *params) | |
2b188cc1 JA |
9351 | { |
9352 | struct user_struct *user = NULL; | |
9353 | struct io_ring_ctx *ctx; | |
aad5d8da | 9354 | bool limit_mem; |
2b188cc1 JA |
9355 | int ret; |
9356 | ||
8110c1a6 | 9357 | if (!entries) |
2b188cc1 | 9358 | return -EINVAL; |
8110c1a6 JA |
9359 | if (entries > IORING_MAX_ENTRIES) { |
9360 | if (!(p->flags & IORING_SETUP_CLAMP)) | |
9361 | return -EINVAL; | |
9362 | entries = IORING_MAX_ENTRIES; | |
9363 | } | |
2b188cc1 JA |
9364 | |
9365 | /* | |
9366 | * Use twice as many entries for the CQ ring. It's possible for the | |
9367 | * application to drive a higher depth than the size of the SQ ring, | |
9368 | * since the sqes are only used at submission time. This allows for | |
33a107f0 JA |
9369 | * some flexibility in overcommitting a bit. If the application has |
9370 | * set IORING_SETUP_CQSIZE, it will have passed in the desired number | |
9371 | * of CQ ring entries manually. | |
2b188cc1 JA |
9372 | */ |
9373 | p->sq_entries = roundup_pow_of_two(entries); | |
33a107f0 JA |
9374 | if (p->flags & IORING_SETUP_CQSIZE) { |
9375 | /* | |
9376 | * If IORING_SETUP_CQSIZE is set, we do the same roundup | |
9377 | * to a power-of-two, if it isn't already. We do NOT impose | |
9378 | * any cq vs sq ring sizing. | |
9379 | */ | |
88ec3211 | 9380 | p->cq_entries = roundup_pow_of_two(p->cq_entries); |
8110c1a6 | 9381 | if (p->cq_entries < p->sq_entries) |
33a107f0 | 9382 | return -EINVAL; |
8110c1a6 JA |
9383 | if (p->cq_entries > IORING_MAX_CQ_ENTRIES) { |
9384 | if (!(p->flags & IORING_SETUP_CLAMP)) | |
9385 | return -EINVAL; | |
9386 | p->cq_entries = IORING_MAX_CQ_ENTRIES; | |
9387 | } | |
33a107f0 JA |
9388 | } else { |
9389 | p->cq_entries = 2 * p->sq_entries; | |
9390 | } | |
2b188cc1 JA |
9391 | |
9392 | user = get_uid(current_user()); | |
aad5d8da | 9393 | limit_mem = !capable(CAP_IPC_LOCK); |
2b188cc1 | 9394 | |
aad5d8da | 9395 | if (limit_mem) { |
a087e2b5 | 9396 | ret = __io_account_mem(user, |
2b188cc1 JA |
9397 | ring_pages(p->sq_entries, p->cq_entries)); |
9398 | if (ret) { | |
9399 | free_uid(user); | |
9400 | return ret; | |
9401 | } | |
9402 | } | |
9403 | ||
9404 | ctx = io_ring_ctx_alloc(p); | |
9405 | if (!ctx) { | |
aad5d8da | 9406 | if (limit_mem) |
a087e2b5 | 9407 | __io_unaccount_mem(user, ring_pages(p->sq_entries, |
2b188cc1 JA |
9408 | p->cq_entries)); |
9409 | free_uid(user); | |
9410 | return -ENOMEM; | |
9411 | } | |
9412 | ctx->compat = in_compat_syscall(); | |
2b188cc1 | 9413 | ctx->user = user; |
0b8c0ec7 | 9414 | ctx->creds = get_current_cred(); |
4ea33a97 JA |
9415 | #ifdef CONFIG_AUDIT |
9416 | ctx->loginuid = current->loginuid; | |
9417 | ctx->sessionid = current->sessionid; | |
9418 | #endif | |
2aede0e4 JA |
9419 | ctx->sqo_task = get_task_struct(current); |
9420 | ||
9421 | /* | |
9422 | * This is just grabbed for accounting purposes. When a process exits, | |
9423 | * the mm is exited and dropped before the files, hence we need to hang | |
9424 | * on to this mm purely for the purposes of being able to unaccount | |
9425 | * memory (locked/pinned vm). It's not used for anything else. | |
9426 | */ | |
6b7898eb | 9427 | mmgrab(current->mm); |
2aede0e4 | 9428 | ctx->mm_account = current->mm; |
6b7898eb | 9429 | |
91d8f519 DZ |
9430 | #ifdef CONFIG_BLK_CGROUP |
9431 | /* | |
9432 | * The sq thread will belong to the original cgroup it was inited in. | |
9433 | * If the cgroup goes offline (e.g. disabling the io controller), then | |
9434 | * issued bios will be associated with the closest cgroup later in the | |
9435 | * block layer. | |
9436 | */ | |
9437 | rcu_read_lock(); | |
9438 | ctx->sqo_blkcg_css = blkcg_css(); | |
9439 | ret = css_tryget_online(ctx->sqo_blkcg_css); | |
9440 | rcu_read_unlock(); | |
9441 | if (!ret) { | |
9442 | /* don't init against a dying cgroup, have the user try again */ | |
9443 | ctx->sqo_blkcg_css = NULL; | |
9444 | ret = -ENODEV; | |
9445 | goto err; | |
9446 | } | |
9447 | #endif | |
6b7898eb | 9448 | |
f74441e6 JA |
9449 | /* |
9450 | * Account memory _before_ installing the file descriptor. Once | |
9451 | * the descriptor is installed, it can get closed at any time. Also | |
9452 | * do this before hitting the general error path, as ring freeing | |
9453 | * will un-account as well. | |
9454 | */ | |
9455 | io_account_mem(ctx, ring_pages(p->sq_entries, p->cq_entries), | |
9456 | ACCT_LOCKED); | |
9457 | ctx->limit_mem = limit_mem; | |
9458 | ||
2b188cc1 JA |
9459 | ret = io_allocate_scq_urings(ctx, p); |
9460 | if (ret) | |
9461 | goto err; | |
9462 | ||
7e84e1c7 | 9463 | ret = io_sq_offload_create(ctx, p); |
2b188cc1 JA |
9464 | if (ret) |
9465 | goto err; | |
9466 | ||
7e84e1c7 SG |
9467 | if (!(p->flags & IORING_SETUP_R_DISABLED)) |
9468 | io_sq_offload_start(ctx); | |
9469 | ||
2b188cc1 | 9470 | memset(&p->sq_off, 0, sizeof(p->sq_off)); |
75b28aff HV |
9471 | p->sq_off.head = offsetof(struct io_rings, sq.head); |
9472 | p->sq_off.tail = offsetof(struct io_rings, sq.tail); | |
9473 | p->sq_off.ring_mask = offsetof(struct io_rings, sq_ring_mask); | |
9474 | p->sq_off.ring_entries = offsetof(struct io_rings, sq_ring_entries); | |
9475 | p->sq_off.flags = offsetof(struct io_rings, sq_flags); | |
9476 | p->sq_off.dropped = offsetof(struct io_rings, sq_dropped); | |
9477 | p->sq_off.array = (char *)ctx->sq_array - (char *)ctx->rings; | |
2b188cc1 JA |
9478 | |
9479 | memset(&p->cq_off, 0, sizeof(p->cq_off)); | |
75b28aff HV |
9480 | p->cq_off.head = offsetof(struct io_rings, cq.head); |
9481 | p->cq_off.tail = offsetof(struct io_rings, cq.tail); | |
9482 | p->cq_off.ring_mask = offsetof(struct io_rings, cq_ring_mask); | |
9483 | p->cq_off.ring_entries = offsetof(struct io_rings, cq_ring_entries); | |
9484 | p->cq_off.overflow = offsetof(struct io_rings, cq_overflow); | |
9485 | p->cq_off.cqes = offsetof(struct io_rings, cqes); | |
0d9b5b3a | 9486 | p->cq_off.flags = offsetof(struct io_rings, cq_flags); |
ac90f249 | 9487 | |
7f13657d XW |
9488 | p->features = IORING_FEAT_SINGLE_MMAP | IORING_FEAT_NODROP | |
9489 | IORING_FEAT_SUBMIT_STABLE | IORING_FEAT_RW_CUR_POS | | |
5769a351 | 9490 | IORING_FEAT_CUR_PERSONALITY | IORING_FEAT_FAST_POLL | |
c73ebb68 HX |
9491 | IORING_FEAT_POLL_32BITS | IORING_FEAT_SQPOLL_NONFIXED | |
9492 | IORING_FEAT_EXT_ARG; | |
7f13657d XW |
9493 | |
9494 | if (copy_to_user(params, p, sizeof(*p))) { | |
9495 | ret = -EFAULT; | |
9496 | goto err; | |
9497 | } | |
d1719f70 | 9498 | |
044c1ab3 JA |
9499 | /* |
9500 | * Install ring fd as the very last thing, so we don't risk someone | |
9501 | * having closed it before we finish setup | |
9502 | */ | |
9503 | ret = io_uring_get_fd(ctx); | |
9504 | if (ret < 0) | |
9505 | goto err; | |
9506 | ||
c826bd7a | 9507 | trace_io_uring_create(ret, ctx, p->sq_entries, p->cq_entries, p->flags); |
2b188cc1 JA |
9508 | return ret; |
9509 | err: | |
9510 | io_ring_ctx_wait_and_kill(ctx); | |
9511 | return ret; | |
9512 | } | |
9513 | ||
9514 | /* | |
9515 | * Sets up an aio uring context, and returns the fd. Applications asks for a | |
9516 | * ring size, we return the actual sq/cq ring sizes (among other things) in the | |
9517 | * params structure passed in. | |
9518 | */ | |
9519 | static long io_uring_setup(u32 entries, struct io_uring_params __user *params) | |
9520 | { | |
9521 | struct io_uring_params p; | |
2b188cc1 JA |
9522 | int i; |
9523 | ||
9524 | if (copy_from_user(&p, params, sizeof(p))) | |
9525 | return -EFAULT; | |
9526 | for (i = 0; i < ARRAY_SIZE(p.resv); i++) { | |
9527 | if (p.resv[i]) | |
9528 | return -EINVAL; | |
9529 | } | |
9530 | ||
6c271ce2 | 9531 | if (p.flags & ~(IORING_SETUP_IOPOLL | IORING_SETUP_SQPOLL | |
8110c1a6 | 9532 | IORING_SETUP_SQ_AFF | IORING_SETUP_CQSIZE | |
7e84e1c7 SG |
9533 | IORING_SETUP_CLAMP | IORING_SETUP_ATTACH_WQ | |
9534 | IORING_SETUP_R_DISABLED)) | |
2b188cc1 JA |
9535 | return -EINVAL; |
9536 | ||
7f13657d | 9537 | return io_uring_create(entries, &p, params); |
2b188cc1 JA |
9538 | } |
9539 | ||
9540 | SYSCALL_DEFINE2(io_uring_setup, u32, entries, | |
9541 | struct io_uring_params __user *, params) | |
9542 | { | |
9543 | return io_uring_setup(entries, params); | |
9544 | } | |
9545 | ||
66f4af93 JA |
9546 | static int io_probe(struct io_ring_ctx *ctx, void __user *arg, unsigned nr_args) |
9547 | { | |
9548 | struct io_uring_probe *p; | |
9549 | size_t size; | |
9550 | int i, ret; | |
9551 | ||
9552 | size = struct_size(p, ops, nr_args); | |
9553 | if (size == SIZE_MAX) | |
9554 | return -EOVERFLOW; | |
9555 | p = kzalloc(size, GFP_KERNEL); | |
9556 | if (!p) | |
9557 | return -ENOMEM; | |
9558 | ||
9559 | ret = -EFAULT; | |
9560 | if (copy_from_user(p, arg, size)) | |
9561 | goto out; | |
9562 | ret = -EINVAL; | |
9563 | if (memchr_inv(p, 0, size)) | |
9564 | goto out; | |
9565 | ||
9566 | p->last_op = IORING_OP_LAST - 1; | |
9567 | if (nr_args > IORING_OP_LAST) | |
9568 | nr_args = IORING_OP_LAST; | |
9569 | ||
9570 | for (i = 0; i < nr_args; i++) { | |
9571 | p->ops[i].op = i; | |
9572 | if (!io_op_defs[i].not_supported) | |
9573 | p->ops[i].flags = IO_URING_OP_SUPPORTED; | |
9574 | } | |
9575 | p->ops_len = i; | |
9576 | ||
9577 | ret = 0; | |
9578 | if (copy_to_user(arg, p, size)) | |
9579 | ret = -EFAULT; | |
9580 | out: | |
9581 | kfree(p); | |
9582 | return ret; | |
9583 | } | |
9584 | ||
071698e1 JA |
9585 | static int io_register_personality(struct io_ring_ctx *ctx) |
9586 | { | |
1e6fa521 JA |
9587 | struct io_identity *id; |
9588 | int ret; | |
071698e1 | 9589 | |
1e6fa521 JA |
9590 | id = kmalloc(sizeof(*id), GFP_KERNEL); |
9591 | if (unlikely(!id)) | |
9592 | return -ENOMEM; | |
9593 | ||
9594 | io_init_identity(id); | |
9595 | id->creds = get_current_cred(); | |
9596 | ||
9597 | ret = idr_alloc_cyclic(&ctx->personality_idr, id, 1, USHRT_MAX, GFP_KERNEL); | |
9598 | if (ret < 0) { | |
9599 | put_cred(id->creds); | |
9600 | kfree(id); | |
9601 | } | |
9602 | return ret; | |
071698e1 JA |
9603 | } |
9604 | ||
9605 | static int io_unregister_personality(struct io_ring_ctx *ctx, unsigned id) | |
9606 | { | |
1e6fa521 | 9607 | struct io_identity *iod; |
071698e1 | 9608 | |
1e6fa521 JA |
9609 | iod = idr_remove(&ctx->personality_idr, id); |
9610 | if (iod) { | |
9611 | put_cred(iod->creds); | |
9612 | if (refcount_dec_and_test(&iod->count)) | |
9613 | kfree(iod); | |
071698e1 JA |
9614 | return 0; |
9615 | } | |
9616 | ||
9617 | return -EINVAL; | |
9618 | } | |
9619 | ||
21b55dbc SG |
9620 | static int io_register_restrictions(struct io_ring_ctx *ctx, void __user *arg, |
9621 | unsigned int nr_args) | |
9622 | { | |
9623 | struct io_uring_restriction *res; | |
9624 | size_t size; | |
9625 | int i, ret; | |
9626 | ||
7e84e1c7 SG |
9627 | /* Restrictions allowed only if rings started disabled */ |
9628 | if (!(ctx->flags & IORING_SETUP_R_DISABLED)) | |
9629 | return -EBADFD; | |
9630 | ||
21b55dbc | 9631 | /* We allow only a single restrictions registration */ |
7e84e1c7 | 9632 | if (ctx->restrictions.registered) |
21b55dbc SG |
9633 | return -EBUSY; |
9634 | ||
9635 | if (!arg || nr_args > IORING_MAX_RESTRICTIONS) | |
9636 | return -EINVAL; | |
9637 | ||
9638 | size = array_size(nr_args, sizeof(*res)); | |
9639 | if (size == SIZE_MAX) | |
9640 | return -EOVERFLOW; | |
9641 | ||
9642 | res = memdup_user(arg, size); | |
9643 | if (IS_ERR(res)) | |
9644 | return PTR_ERR(res); | |
9645 | ||
9646 | ret = 0; | |
9647 | ||
9648 | for (i = 0; i < nr_args; i++) { | |
9649 | switch (res[i].opcode) { | |
9650 | case IORING_RESTRICTION_REGISTER_OP: | |
9651 | if (res[i].register_op >= IORING_REGISTER_LAST) { | |
9652 | ret = -EINVAL; | |
9653 | goto out; | |
9654 | } | |
9655 | ||
9656 | __set_bit(res[i].register_op, | |
9657 | ctx->restrictions.register_op); | |
9658 | break; | |
9659 | case IORING_RESTRICTION_SQE_OP: | |
9660 | if (res[i].sqe_op >= IORING_OP_LAST) { | |
9661 | ret = -EINVAL; | |
9662 | goto out; | |
9663 | } | |
9664 | ||
9665 | __set_bit(res[i].sqe_op, ctx->restrictions.sqe_op); | |
9666 | break; | |
9667 | case IORING_RESTRICTION_SQE_FLAGS_ALLOWED: | |
9668 | ctx->restrictions.sqe_flags_allowed = res[i].sqe_flags; | |
9669 | break; | |
9670 | case IORING_RESTRICTION_SQE_FLAGS_REQUIRED: | |
9671 | ctx->restrictions.sqe_flags_required = res[i].sqe_flags; | |
9672 | break; | |
9673 | default: | |
9674 | ret = -EINVAL; | |
9675 | goto out; | |
9676 | } | |
9677 | } | |
9678 | ||
9679 | out: | |
9680 | /* Reset all restrictions if an error happened */ | |
9681 | if (ret != 0) | |
9682 | memset(&ctx->restrictions, 0, sizeof(ctx->restrictions)); | |
9683 | else | |
7e84e1c7 | 9684 | ctx->restrictions.registered = true; |
21b55dbc SG |
9685 | |
9686 | kfree(res); | |
9687 | return ret; | |
9688 | } | |
9689 | ||
7e84e1c7 SG |
9690 | static int io_register_enable_rings(struct io_ring_ctx *ctx) |
9691 | { | |
9692 | if (!(ctx->flags & IORING_SETUP_R_DISABLED)) | |
9693 | return -EBADFD; | |
9694 | ||
9695 | if (ctx->restrictions.registered) | |
9696 | ctx->restricted = 1; | |
9697 | ||
9698 | ctx->flags &= ~IORING_SETUP_R_DISABLED; | |
9699 | ||
9700 | io_sq_offload_start(ctx); | |
9701 | ||
9702 | return 0; | |
9703 | } | |
9704 | ||
071698e1 JA |
9705 | static bool io_register_op_must_quiesce(int op) |
9706 | { | |
9707 | switch (op) { | |
9708 | case IORING_UNREGISTER_FILES: | |
9709 | case IORING_REGISTER_FILES_UPDATE: | |
9710 | case IORING_REGISTER_PROBE: | |
9711 | case IORING_REGISTER_PERSONALITY: | |
9712 | case IORING_UNREGISTER_PERSONALITY: | |
9713 | return false; | |
9714 | default: | |
9715 | return true; | |
9716 | } | |
9717 | } | |
9718 | ||
edafccee JA |
9719 | static int __io_uring_register(struct io_ring_ctx *ctx, unsigned opcode, |
9720 | void __user *arg, unsigned nr_args) | |
b19062a5 JA |
9721 | __releases(ctx->uring_lock) |
9722 | __acquires(ctx->uring_lock) | |
edafccee JA |
9723 | { |
9724 | int ret; | |
9725 | ||
35fa71a0 JA |
9726 | /* |
9727 | * We're inside the ring mutex, if the ref is already dying, then | |
9728 | * someone else killed the ctx or is already going through | |
9729 | * io_uring_register(). | |
9730 | */ | |
9731 | if (percpu_ref_is_dying(&ctx->refs)) | |
9732 | return -ENXIO; | |
9733 | ||
071698e1 | 9734 | if (io_register_op_must_quiesce(opcode)) { |
05f3fb3c | 9735 | percpu_ref_kill(&ctx->refs); |
b19062a5 | 9736 | |
05f3fb3c JA |
9737 | /* |
9738 | * Drop uring mutex before waiting for references to exit. If | |
9739 | * another thread is currently inside io_uring_enter() it might | |
9740 | * need to grab the uring_lock to make progress. If we hold it | |
9741 | * here across the drain wait, then we can deadlock. It's safe | |
9742 | * to drop the mutex here, since no new references will come in | |
9743 | * after we've killed the percpu ref. | |
9744 | */ | |
9745 | mutex_unlock(&ctx->uring_lock); | |
af9c1a44 JA |
9746 | do { |
9747 | ret = wait_for_completion_interruptible(&ctx->ref_comp); | |
9748 | if (!ret) | |
9749 | break; | |
ed6930c9 JA |
9750 | ret = io_run_task_work_sig(); |
9751 | if (ret < 0) | |
9752 | break; | |
af9c1a44 JA |
9753 | } while (1); |
9754 | ||
05f3fb3c | 9755 | mutex_lock(&ctx->uring_lock); |
af9c1a44 | 9756 | |
c150368b JA |
9757 | if (ret) { |
9758 | percpu_ref_resurrect(&ctx->refs); | |
21b55dbc SG |
9759 | goto out_quiesce; |
9760 | } | |
9761 | } | |
9762 | ||
9763 | if (ctx->restricted) { | |
9764 | if (opcode >= IORING_REGISTER_LAST) { | |
9765 | ret = -EINVAL; | |
9766 | goto out; | |
9767 | } | |
9768 | ||
9769 | if (!test_bit(opcode, ctx->restrictions.register_op)) { | |
9770 | ret = -EACCES; | |
c150368b JA |
9771 | goto out; |
9772 | } | |
05f3fb3c | 9773 | } |
edafccee JA |
9774 | |
9775 | switch (opcode) { | |
9776 | case IORING_REGISTER_BUFFERS: | |
9777 | ret = io_sqe_buffer_register(ctx, arg, nr_args); | |
9778 | break; | |
9779 | case IORING_UNREGISTER_BUFFERS: | |
9780 | ret = -EINVAL; | |
9781 | if (arg || nr_args) | |
9782 | break; | |
9783 | ret = io_sqe_buffer_unregister(ctx); | |
9784 | break; | |
6b06314c JA |
9785 | case IORING_REGISTER_FILES: |
9786 | ret = io_sqe_files_register(ctx, arg, nr_args); | |
9787 | break; | |
9788 | case IORING_UNREGISTER_FILES: | |
9789 | ret = -EINVAL; | |
9790 | if (arg || nr_args) | |
9791 | break; | |
9792 | ret = io_sqe_files_unregister(ctx); | |
9793 | break; | |
c3a31e60 JA |
9794 | case IORING_REGISTER_FILES_UPDATE: |
9795 | ret = io_sqe_files_update(ctx, arg, nr_args); | |
9796 | break; | |
9b402849 | 9797 | case IORING_REGISTER_EVENTFD: |
f2842ab5 | 9798 | case IORING_REGISTER_EVENTFD_ASYNC: |
9b402849 JA |
9799 | ret = -EINVAL; |
9800 | if (nr_args != 1) | |
9801 | break; | |
9802 | ret = io_eventfd_register(ctx, arg); | |
f2842ab5 JA |
9803 | if (ret) |
9804 | break; | |
9805 | if (opcode == IORING_REGISTER_EVENTFD_ASYNC) | |
9806 | ctx->eventfd_async = 1; | |
9807 | else | |
9808 | ctx->eventfd_async = 0; | |
9b402849 JA |
9809 | break; |
9810 | case IORING_UNREGISTER_EVENTFD: | |
9811 | ret = -EINVAL; | |
9812 | if (arg || nr_args) | |
9813 | break; | |
9814 | ret = io_eventfd_unregister(ctx); | |
9815 | break; | |
66f4af93 JA |
9816 | case IORING_REGISTER_PROBE: |
9817 | ret = -EINVAL; | |
9818 | if (!arg || nr_args > 256) | |
9819 | break; | |
9820 | ret = io_probe(ctx, arg, nr_args); | |
9821 | break; | |
071698e1 JA |
9822 | case IORING_REGISTER_PERSONALITY: |
9823 | ret = -EINVAL; | |
9824 | if (arg || nr_args) | |
9825 | break; | |
9826 | ret = io_register_personality(ctx); | |
9827 | break; | |
9828 | case IORING_UNREGISTER_PERSONALITY: | |
9829 | ret = -EINVAL; | |
9830 | if (arg) | |
9831 | break; | |
9832 | ret = io_unregister_personality(ctx, nr_args); | |
9833 | break; | |
7e84e1c7 SG |
9834 | case IORING_REGISTER_ENABLE_RINGS: |
9835 | ret = -EINVAL; | |
9836 | if (arg || nr_args) | |
9837 | break; | |
9838 | ret = io_register_enable_rings(ctx); | |
9839 | break; | |
21b55dbc SG |
9840 | case IORING_REGISTER_RESTRICTIONS: |
9841 | ret = io_register_restrictions(ctx, arg, nr_args); | |
9842 | break; | |
edafccee JA |
9843 | default: |
9844 | ret = -EINVAL; | |
9845 | break; | |
9846 | } | |
9847 | ||
21b55dbc | 9848 | out: |
071698e1 | 9849 | if (io_register_op_must_quiesce(opcode)) { |
05f3fb3c | 9850 | /* bring the ctx back to life */ |
05f3fb3c | 9851 | percpu_ref_reinit(&ctx->refs); |
21b55dbc | 9852 | out_quiesce: |
0f158b4c | 9853 | reinit_completion(&ctx->ref_comp); |
05f3fb3c | 9854 | } |
edafccee JA |
9855 | return ret; |
9856 | } | |
9857 | ||
9858 | SYSCALL_DEFINE4(io_uring_register, unsigned int, fd, unsigned int, opcode, | |
9859 | void __user *, arg, unsigned int, nr_args) | |
9860 | { | |
9861 | struct io_ring_ctx *ctx; | |
9862 | long ret = -EBADF; | |
9863 | struct fd f; | |
9864 | ||
9865 | f = fdget(fd); | |
9866 | if (!f.file) | |
9867 | return -EBADF; | |
9868 | ||
9869 | ret = -EOPNOTSUPP; | |
9870 | if (f.file->f_op != &io_uring_fops) | |
9871 | goto out_fput; | |
9872 | ||
9873 | ctx = f.file->private_data; | |
9874 | ||
9875 | mutex_lock(&ctx->uring_lock); | |
9876 | ret = __io_uring_register(ctx, opcode, arg, nr_args); | |
9877 | mutex_unlock(&ctx->uring_lock); | |
c826bd7a DD |
9878 | trace_io_uring_register(ctx, opcode, ctx->nr_user_files, ctx->nr_user_bufs, |
9879 | ctx->cq_ev_fd != NULL, ret); | |
edafccee JA |
9880 | out_fput: |
9881 | fdput(f); | |
9882 | return ret; | |
9883 | } | |
9884 | ||
2b188cc1 JA |
9885 | static int __init io_uring_init(void) |
9886 | { | |
d7f62e82 SM |
9887 | #define __BUILD_BUG_VERIFY_ELEMENT(stype, eoffset, etype, ename) do { \ |
9888 | BUILD_BUG_ON(offsetof(stype, ename) != eoffset); \ | |
9889 | BUILD_BUG_ON(sizeof(etype) != sizeof_field(stype, ename)); \ | |
9890 | } while (0) | |
9891 | ||
9892 | #define BUILD_BUG_SQE_ELEM(eoffset, etype, ename) \ | |
9893 | __BUILD_BUG_VERIFY_ELEMENT(struct io_uring_sqe, eoffset, etype, ename) | |
9894 | BUILD_BUG_ON(sizeof(struct io_uring_sqe) != 64); | |
9895 | BUILD_BUG_SQE_ELEM(0, __u8, opcode); | |
9896 | BUILD_BUG_SQE_ELEM(1, __u8, flags); | |
9897 | BUILD_BUG_SQE_ELEM(2, __u16, ioprio); | |
9898 | BUILD_BUG_SQE_ELEM(4, __s32, fd); | |
9899 | BUILD_BUG_SQE_ELEM(8, __u64, off); | |
9900 | BUILD_BUG_SQE_ELEM(8, __u64, addr2); | |
9901 | BUILD_BUG_SQE_ELEM(16, __u64, addr); | |
7d67af2c | 9902 | BUILD_BUG_SQE_ELEM(16, __u64, splice_off_in); |
d7f62e82 SM |
9903 | BUILD_BUG_SQE_ELEM(24, __u32, len); |
9904 | BUILD_BUG_SQE_ELEM(28, __kernel_rwf_t, rw_flags); | |
9905 | BUILD_BUG_SQE_ELEM(28, /* compat */ int, rw_flags); | |
9906 | BUILD_BUG_SQE_ELEM(28, /* compat */ __u32, rw_flags); | |
9907 | BUILD_BUG_SQE_ELEM(28, __u32, fsync_flags); | |
5769a351 JX |
9908 | BUILD_BUG_SQE_ELEM(28, /* compat */ __u16, poll_events); |
9909 | BUILD_BUG_SQE_ELEM(28, __u32, poll32_events); | |
d7f62e82 SM |
9910 | BUILD_BUG_SQE_ELEM(28, __u32, sync_range_flags); |
9911 | BUILD_BUG_SQE_ELEM(28, __u32, msg_flags); | |
9912 | BUILD_BUG_SQE_ELEM(28, __u32, timeout_flags); | |
9913 | BUILD_BUG_SQE_ELEM(28, __u32, accept_flags); | |
9914 | BUILD_BUG_SQE_ELEM(28, __u32, cancel_flags); | |
9915 | BUILD_BUG_SQE_ELEM(28, __u32, open_flags); | |
9916 | BUILD_BUG_SQE_ELEM(28, __u32, statx_flags); | |
9917 | BUILD_BUG_SQE_ELEM(28, __u32, fadvise_advice); | |
7d67af2c | 9918 | BUILD_BUG_SQE_ELEM(28, __u32, splice_flags); |
d7f62e82 SM |
9919 | BUILD_BUG_SQE_ELEM(32, __u64, user_data); |
9920 | BUILD_BUG_SQE_ELEM(40, __u16, buf_index); | |
9921 | BUILD_BUG_SQE_ELEM(42, __u16, personality); | |
7d67af2c | 9922 | BUILD_BUG_SQE_ELEM(44, __s32, splice_fd_in); |
d7f62e82 | 9923 | |
d3656344 | 9924 | BUILD_BUG_ON(ARRAY_SIZE(io_op_defs) != IORING_OP_LAST); |
84557871 | 9925 | BUILD_BUG_ON(__REQ_F_LAST_BIT >= 8 * sizeof(int)); |
2b188cc1 JA |
9926 | req_cachep = KMEM_CACHE(io_kiocb, SLAB_HWCACHE_ALIGN | SLAB_PANIC); |
9927 | return 0; | |
9928 | }; | |
9929 | __initcall(io_uring_init); |