]>
Commit | Line | Data |
---|---|---|
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 JA |
289 | |
290 | wait_queue_head_t inflight_wait; | |
ad3eb2c8 | 291 | struct io_uring_sqe *sq_sqes; |
2b188cc1 JA |
292 | } ____cacheline_aligned_in_smp; |
293 | ||
206aefde JA |
294 | struct io_rings *rings; |
295 | ||
2b188cc1 | 296 | /* IO offload */ |
561fb04a | 297 | struct io_wq *io_wq; |
2aede0e4 JA |
298 | |
299 | /* | |
300 | * For SQPOLL usage - we hold a reference to the parent task, so we | |
301 | * have access to the ->files | |
302 | */ | |
303 | struct task_struct *sqo_task; | |
304 | ||
305 | /* Only used for accounting purposes */ | |
306 | struct mm_struct *mm_account; | |
307 | ||
91d8f519 DZ |
308 | #ifdef CONFIG_BLK_CGROUP |
309 | struct cgroup_subsys_state *sqo_blkcg_css; | |
310 | #endif | |
311 | ||
534ca6d6 JA |
312 | struct io_sq_data *sq_data; /* if using sq thread polling */ |
313 | ||
90554200 | 314 | struct wait_queue_head sqo_sq_wait; |
69fb2131 | 315 | struct list_head sqd_list; |
75b28aff | 316 | |
6b06314c JA |
317 | /* |
318 | * If used, fixed file set. Writers must ensure that ->refs is dead, | |
319 | * readers must ensure that ->refs is alive as long as the file* is | |
320 | * used. Only updated through io_uring_register(2). | |
321 | */ | |
05f3fb3c | 322 | struct fixed_file_data *file_data; |
6b06314c JA |
323 | unsigned nr_user_files; |
324 | ||
edafccee JA |
325 | /* if used, fixed mapped user buffers */ |
326 | unsigned nr_user_bufs; | |
327 | struct io_mapped_ubuf *user_bufs; | |
328 | ||
2b188cc1 JA |
329 | struct user_struct *user; |
330 | ||
0b8c0ec7 | 331 | const struct cred *creds; |
181e448d | 332 | |
4ea33a97 JA |
333 | #ifdef CONFIG_AUDIT |
334 | kuid_t loginuid; | |
335 | unsigned int sessionid; | |
336 | #endif | |
337 | ||
0f158b4c JA |
338 | struct completion ref_comp; |
339 | struct completion sq_thread_comp; | |
206aefde | 340 | |
0ddf92e8 JA |
341 | /* if all else fails... */ |
342 | struct io_kiocb *fallback_req; | |
343 | ||
206aefde JA |
344 | #if defined(CONFIG_UNIX) |
345 | struct socket *ring_sock; | |
346 | #endif | |
347 | ||
5a2e745d JA |
348 | struct idr io_buffer_idr; |
349 | ||
071698e1 JA |
350 | struct idr personality_idr; |
351 | ||
206aefde JA |
352 | struct { |
353 | unsigned cached_cq_tail; | |
354 | unsigned cq_entries; | |
355 | unsigned cq_mask; | |
356 | atomic_t cq_timeouts; | |
ad3eb2c8 | 357 | unsigned long cq_check_overflow; |
206aefde JA |
358 | struct wait_queue_head cq_wait; |
359 | struct fasync_struct *cq_fasync; | |
360 | struct eventfd_ctx *cq_ev_fd; | |
361 | } ____cacheline_aligned_in_smp; | |
2b188cc1 JA |
362 | |
363 | struct { | |
364 | struct mutex uring_lock; | |
365 | wait_queue_head_t wait; | |
366 | } ____cacheline_aligned_in_smp; | |
367 | ||
368 | struct { | |
369 | spinlock_t completion_lock; | |
e94f141b | 370 | |
def596e9 | 371 | /* |
540e32a0 | 372 | * ->iopoll_list is protected by the ctx->uring_lock for |
def596e9 JA |
373 | * io_uring instances that don't use IORING_SETUP_SQPOLL. |
374 | * For SQPOLL, only the single threaded io_sq_thread() will | |
375 | * manipulate the list, hence no extra locking is needed there. | |
376 | */ | |
540e32a0 | 377 | struct list_head iopoll_list; |
78076bb6 JA |
378 | struct hlist_head *cancel_hash; |
379 | unsigned cancel_hash_bits; | |
e94f141b | 380 | bool poll_multi_file; |
31b51510 | 381 | |
fcb323cc JA |
382 | spinlock_t inflight_lock; |
383 | struct list_head inflight_list; | |
2b188cc1 | 384 | } ____cacheline_aligned_in_smp; |
85faa7b8 | 385 | |
4a38aed2 JA |
386 | struct delayed_work file_put_work; |
387 | struct llist_head file_put_llist; | |
388 | ||
85faa7b8 | 389 | struct work_struct exit_work; |
21b55dbc | 390 | struct io_restriction restrictions; |
2b188cc1 JA |
391 | }; |
392 | ||
09bb8394 JA |
393 | /* |
394 | * First field must be the file pointer in all the | |
395 | * iocb unions! See also 'struct kiocb' in <linux/fs.h> | |
396 | */ | |
221c5eb2 JA |
397 | struct io_poll_iocb { |
398 | struct file *file; | |
018043be | 399 | struct wait_queue_head *head; |
221c5eb2 | 400 | __poll_t events; |
8c838788 | 401 | bool done; |
221c5eb2 | 402 | bool canceled; |
392edb45 | 403 | struct wait_queue_entry wait; |
221c5eb2 JA |
404 | }; |
405 | ||
018043be PB |
406 | struct io_poll_remove { |
407 | struct file *file; | |
408 | u64 addr; | |
409 | }; | |
410 | ||
b5dba59e JA |
411 | struct io_close { |
412 | struct file *file; | |
413 | struct file *put_file; | |
414 | int fd; | |
415 | }; | |
416 | ||
ad8a48ac JA |
417 | struct io_timeout_data { |
418 | struct io_kiocb *req; | |
419 | struct hrtimer timer; | |
420 | struct timespec64 ts; | |
421 | enum hrtimer_mode mode; | |
422 | }; | |
423 | ||
8ed8d3c3 JA |
424 | struct io_accept { |
425 | struct file *file; | |
426 | struct sockaddr __user *addr; | |
427 | int __user *addr_len; | |
428 | int flags; | |
09952e3e | 429 | unsigned long nofile; |
8ed8d3c3 JA |
430 | }; |
431 | ||
432 | struct io_sync { | |
433 | struct file *file; | |
434 | loff_t len; | |
435 | loff_t off; | |
436 | int flags; | |
d63d1b5e | 437 | int mode; |
8ed8d3c3 JA |
438 | }; |
439 | ||
fbf23849 JA |
440 | struct io_cancel { |
441 | struct file *file; | |
442 | u64 addr; | |
443 | }; | |
444 | ||
b29472ee JA |
445 | struct io_timeout { |
446 | struct file *file; | |
bfe68a22 PB |
447 | u32 off; |
448 | u32 target_seq; | |
135fcde8 | 449 | struct list_head list; |
90cd7e42 PB |
450 | /* head of the link, used by linked timeouts only */ |
451 | struct io_kiocb *head; | |
b29472ee JA |
452 | }; |
453 | ||
0bdf7a2d PB |
454 | struct io_timeout_rem { |
455 | struct file *file; | |
456 | u64 addr; | |
457 | }; | |
458 | ||
9adbd45d JA |
459 | struct io_rw { |
460 | /* NOTE: kiocb has the file as the first member, so don't do it here */ | |
461 | struct kiocb kiocb; | |
462 | u64 addr; | |
463 | u64 len; | |
464 | }; | |
465 | ||
3fbb51c1 JA |
466 | struct io_connect { |
467 | struct file *file; | |
468 | struct sockaddr __user *addr; | |
469 | int addr_len; | |
470 | }; | |
471 | ||
e47293fd JA |
472 | struct io_sr_msg { |
473 | struct file *file; | |
fddaface | 474 | union { |
270a5940 | 475 | struct user_msghdr __user *umsg; |
fddaface JA |
476 | void __user *buf; |
477 | }; | |
e47293fd | 478 | int msg_flags; |
bcda7baa | 479 | int bgid; |
fddaface | 480 | size_t len; |
bcda7baa | 481 | struct io_buffer *kbuf; |
e47293fd JA |
482 | }; |
483 | ||
15b71abe JA |
484 | struct io_open { |
485 | struct file *file; | |
486 | int dfd; | |
944d1444 | 487 | bool ignore_nonblock; |
15b71abe | 488 | struct filename *filename; |
c12cedf2 | 489 | struct open_how how; |
4022e7af | 490 | unsigned long nofile; |
15b71abe JA |
491 | }; |
492 | ||
05f3fb3c JA |
493 | struct io_files_update { |
494 | struct file *file; | |
495 | u64 arg; | |
496 | u32 nr_args; | |
497 | u32 offset; | |
498 | }; | |
499 | ||
4840e418 JA |
500 | struct io_fadvise { |
501 | struct file *file; | |
502 | u64 offset; | |
503 | u32 len; | |
504 | u32 advice; | |
505 | }; | |
506 | ||
c1ca757b JA |
507 | struct io_madvise { |
508 | struct file *file; | |
509 | u64 addr; | |
510 | u32 len; | |
511 | u32 advice; | |
512 | }; | |
513 | ||
3e4827b0 JA |
514 | struct io_epoll { |
515 | struct file *file; | |
516 | int epfd; | |
517 | int op; | |
518 | int fd; | |
519 | struct epoll_event event; | |
e47293fd JA |
520 | }; |
521 | ||
7d67af2c PB |
522 | struct io_splice { |
523 | struct file *file_out; | |
524 | struct file *file_in; | |
525 | loff_t off_out; | |
526 | loff_t off_in; | |
527 | u64 len; | |
528 | unsigned int flags; | |
529 | }; | |
530 | ||
ddf0322d JA |
531 | struct io_provide_buf { |
532 | struct file *file; | |
533 | __u64 addr; | |
534 | __s32 len; | |
535 | __u32 bgid; | |
536 | __u16 nbufs; | |
537 | __u16 bid; | |
538 | }; | |
539 | ||
1d9e1288 BM |
540 | struct io_statx { |
541 | struct file *file; | |
542 | int dfd; | |
543 | unsigned int mask; | |
544 | unsigned int flags; | |
e62753e4 | 545 | const char __user *filename; |
1d9e1288 BM |
546 | struct statx __user *buffer; |
547 | }; | |
548 | ||
36f4fa68 JA |
549 | struct io_shutdown { |
550 | struct file *file; | |
551 | int how; | |
552 | }; | |
553 | ||
80a261fd JA |
554 | struct io_rename { |
555 | struct file *file; | |
556 | int old_dfd; | |
557 | int new_dfd; | |
558 | struct filename *oldpath; | |
559 | struct filename *newpath; | |
560 | int flags; | |
561 | }; | |
562 | ||
14a1143b JA |
563 | struct io_unlink { |
564 | struct file *file; | |
565 | int dfd; | |
566 | int flags; | |
567 | struct filename *filename; | |
568 | }; | |
569 | ||
3ca405eb PB |
570 | struct io_completion { |
571 | struct file *file; | |
572 | struct list_head list; | |
0f7e466b | 573 | int cflags; |
3ca405eb PB |
574 | }; |
575 | ||
f499a021 JA |
576 | struct io_async_connect { |
577 | struct sockaddr_storage address; | |
578 | }; | |
579 | ||
03b1230c JA |
580 | struct io_async_msghdr { |
581 | struct iovec fast_iov[UIO_FASTIOV]; | |
582 | struct iovec *iov; | |
583 | struct sockaddr __user *uaddr; | |
584 | struct msghdr msg; | |
b537916c | 585 | struct sockaddr_storage addr; |
03b1230c JA |
586 | }; |
587 | ||
f67676d1 JA |
588 | struct io_async_rw { |
589 | struct iovec fast_iov[UIO_FASTIOV]; | |
ff6165b2 JA |
590 | const struct iovec *free_iovec; |
591 | struct iov_iter iter; | |
227c0c96 | 592 | size_t bytes_done; |
bcf5a063 | 593 | struct wait_page_queue wpq; |
f67676d1 JA |
594 | }; |
595 | ||
6b47ee6e PB |
596 | enum { |
597 | REQ_F_FIXED_FILE_BIT = IOSQE_FIXED_FILE_BIT, | |
598 | REQ_F_IO_DRAIN_BIT = IOSQE_IO_DRAIN_BIT, | |
599 | REQ_F_LINK_BIT = IOSQE_IO_LINK_BIT, | |
600 | REQ_F_HARDLINK_BIT = IOSQE_IO_HARDLINK_BIT, | |
601 | REQ_F_FORCE_ASYNC_BIT = IOSQE_ASYNC_BIT, | |
bcda7baa | 602 | REQ_F_BUFFER_SELECT_BIT = IOSQE_BUFFER_SELECT_BIT, |
6b47ee6e | 603 | |
6b47ee6e PB |
604 | REQ_F_FAIL_LINK_BIT, |
605 | REQ_F_INFLIGHT_BIT, | |
606 | REQ_F_CUR_POS_BIT, | |
607 | REQ_F_NOWAIT_BIT, | |
6b47ee6e | 608 | REQ_F_LINK_TIMEOUT_BIT, |
6b47ee6e | 609 | REQ_F_ISREG_BIT, |
99bc4c38 | 610 | REQ_F_NEED_CLEANUP_BIT, |
d7718a9d | 611 | REQ_F_POLLED_BIT, |
bcda7baa | 612 | REQ_F_BUFFER_SELECTED_BIT, |
5b0bbee4 | 613 | REQ_F_NO_FILE_TABLE_BIT, |
7cdaf587 | 614 | REQ_F_WORK_INITIALIZED_BIT, |
900fad45 | 615 | REQ_F_LTIMEOUT_ACTIVE_BIT, |
84557871 JA |
616 | |
617 | /* not a real bit, just to check we're not overflowing the space */ | |
618 | __REQ_F_LAST_BIT, | |
6b47ee6e PB |
619 | }; |
620 | ||
621 | enum { | |
622 | /* ctx owns file */ | |
623 | REQ_F_FIXED_FILE = BIT(REQ_F_FIXED_FILE_BIT), | |
624 | /* drain existing IO first */ | |
625 | REQ_F_IO_DRAIN = BIT(REQ_F_IO_DRAIN_BIT), | |
626 | /* linked sqes */ | |
627 | REQ_F_LINK = BIT(REQ_F_LINK_BIT), | |
628 | /* doesn't sever on completion < 0 */ | |
629 | REQ_F_HARDLINK = BIT(REQ_F_HARDLINK_BIT), | |
630 | /* IOSQE_ASYNC */ | |
631 | REQ_F_FORCE_ASYNC = BIT(REQ_F_FORCE_ASYNC_BIT), | |
bcda7baa JA |
632 | /* IOSQE_BUFFER_SELECT */ |
633 | REQ_F_BUFFER_SELECT = BIT(REQ_F_BUFFER_SELECT_BIT), | |
6b47ee6e | 634 | |
6b47ee6e PB |
635 | /* fail rest of links */ |
636 | REQ_F_FAIL_LINK = BIT(REQ_F_FAIL_LINK_BIT), | |
637 | /* on inflight list */ | |
638 | REQ_F_INFLIGHT = BIT(REQ_F_INFLIGHT_BIT), | |
639 | /* read/write uses file position */ | |
640 | REQ_F_CUR_POS = BIT(REQ_F_CUR_POS_BIT), | |
641 | /* must not punt to workers */ | |
642 | REQ_F_NOWAIT = BIT(REQ_F_NOWAIT_BIT), | |
900fad45 | 643 | /* has or had linked timeout */ |
6b47ee6e | 644 | REQ_F_LINK_TIMEOUT = BIT(REQ_F_LINK_TIMEOUT_BIT), |
6b47ee6e PB |
645 | /* regular file */ |
646 | REQ_F_ISREG = BIT(REQ_F_ISREG_BIT), | |
99bc4c38 PB |
647 | /* needs cleanup */ |
648 | REQ_F_NEED_CLEANUP = BIT(REQ_F_NEED_CLEANUP_BIT), | |
d7718a9d JA |
649 | /* already went through poll handler */ |
650 | REQ_F_POLLED = BIT(REQ_F_POLLED_BIT), | |
bcda7baa JA |
651 | /* buffer already selected */ |
652 | REQ_F_BUFFER_SELECTED = BIT(REQ_F_BUFFER_SELECTED_BIT), | |
5b0bbee4 JA |
653 | /* doesn't need file table for this request */ |
654 | REQ_F_NO_FILE_TABLE = BIT(REQ_F_NO_FILE_TABLE_BIT), | |
7cdaf587 XW |
655 | /* io_wq_work is initialized */ |
656 | REQ_F_WORK_INITIALIZED = BIT(REQ_F_WORK_INITIALIZED_BIT), | |
900fad45 PB |
657 | /* linked timeout is active, i.e. prepared by link's head */ |
658 | REQ_F_LTIMEOUT_ACTIVE = BIT(REQ_F_LTIMEOUT_ACTIVE_BIT), | |
d7718a9d JA |
659 | }; |
660 | ||
661 | struct async_poll { | |
662 | struct io_poll_iocb poll; | |
807abcb0 | 663 | struct io_poll_iocb *double_poll; |
6b47ee6e PB |
664 | }; |
665 | ||
09bb8394 JA |
666 | /* |
667 | * NOTE! Each of the iocb union members has the file pointer | |
668 | * as the first entry in their struct definition. So you can | |
669 | * access the file pointer through any of the sub-structs, | |
670 | * or directly as just 'ki_filp' in this struct. | |
671 | */ | |
2b188cc1 | 672 | struct io_kiocb { |
221c5eb2 | 673 | union { |
09bb8394 | 674 | struct file *file; |
9adbd45d | 675 | struct io_rw rw; |
221c5eb2 | 676 | struct io_poll_iocb poll; |
018043be | 677 | struct io_poll_remove poll_remove; |
8ed8d3c3 JA |
678 | struct io_accept accept; |
679 | struct io_sync sync; | |
fbf23849 | 680 | struct io_cancel cancel; |
b29472ee | 681 | struct io_timeout timeout; |
0bdf7a2d | 682 | struct io_timeout_rem timeout_rem; |
3fbb51c1 | 683 | struct io_connect connect; |
e47293fd | 684 | struct io_sr_msg sr_msg; |
15b71abe | 685 | struct io_open open; |
b5dba59e | 686 | struct io_close close; |
05f3fb3c | 687 | struct io_files_update files_update; |
4840e418 | 688 | struct io_fadvise fadvise; |
c1ca757b | 689 | struct io_madvise madvise; |
3e4827b0 | 690 | struct io_epoll epoll; |
7d67af2c | 691 | struct io_splice splice; |
ddf0322d | 692 | struct io_provide_buf pbuf; |
1d9e1288 | 693 | struct io_statx statx; |
36f4fa68 | 694 | struct io_shutdown shutdown; |
80a261fd | 695 | struct io_rename rename; |
14a1143b | 696 | struct io_unlink unlink; |
3ca405eb PB |
697 | /* use only after cleaning per-op data, see io_clean_op() */ |
698 | struct io_completion compl; | |
221c5eb2 | 699 | }; |
2b188cc1 | 700 | |
e8c2bc1f JA |
701 | /* opcode allocated if it needs to store data for async defer */ |
702 | void *async_data; | |
d625c6ee | 703 | u8 opcode; |
65a6543d XW |
704 | /* polled IO has completed */ |
705 | u8 iopoll_completed; | |
2b188cc1 | 706 | |
4f4eeba8 | 707 | u16 buf_index; |
9cf7c104 | 708 | u32 result; |
4f4eeba8 | 709 | |
010e8e6b PB |
710 | struct io_ring_ctx *ctx; |
711 | unsigned int flags; | |
712 | refcount_t refs; | |
713 | struct task_struct *task; | |
714 | u64 user_data; | |
d7718a9d | 715 | |
f2f87370 | 716 | struct io_kiocb *link; |
0415767e | 717 | struct percpu_ref *fixed_file_refs; |
fcb323cc | 718 | |
d21ffe7e PB |
719 | /* |
720 | * 1. used with ctx->iopoll_list with reads/writes | |
721 | * 2. to track reqs with ->files (see io_op_def::file_table) | |
722 | */ | |
010e8e6b | 723 | struct list_head inflight_entry; |
010e8e6b PB |
724 | struct callback_head task_work; |
725 | /* for polled requests, i.e. IORING_OP_POLL_ADD and async armed poll */ | |
726 | struct hlist_node hash_node; | |
727 | struct async_poll *apoll; | |
728 | struct io_wq_work work; | |
2b188cc1 | 729 | }; |
05589553 | 730 | |
27dc8338 PB |
731 | struct io_defer_entry { |
732 | struct list_head list; | |
733 | struct io_kiocb *req; | |
9cf7c104 | 734 | u32 seq; |
2b188cc1 JA |
735 | }; |
736 | ||
def596e9 | 737 | #define IO_IOPOLL_BATCH 8 |
2b188cc1 | 738 | |
013538bd JA |
739 | struct io_comp_state { |
740 | unsigned int nr; | |
741 | struct list_head list; | |
742 | struct io_ring_ctx *ctx; | |
743 | }; | |
744 | ||
9a56a232 JA |
745 | struct io_submit_state { |
746 | struct blk_plug plug; | |
747 | ||
2579f913 JA |
748 | /* |
749 | * io_kiocb alloc cache | |
750 | */ | |
751 | void *reqs[IO_IOPOLL_BATCH]; | |
6c8a3134 | 752 | unsigned int free_reqs; |
2579f913 | 753 | |
27926b68 JA |
754 | bool plug_started; |
755 | ||
013538bd JA |
756 | /* |
757 | * Batch completion logic | |
758 | */ | |
759 | struct io_comp_state comp; | |
760 | ||
9a56a232 JA |
761 | /* |
762 | * File reference cache | |
763 | */ | |
764 | struct file *file; | |
765 | unsigned int fd; | |
766 | unsigned int has_refs; | |
9a56a232 JA |
767 | unsigned int ios_left; |
768 | }; | |
769 | ||
d3656344 | 770 | struct io_op_def { |
d3656344 JA |
771 | /* needs req->file assigned */ |
772 | unsigned needs_file : 1; | |
fd2206e4 JA |
773 | /* don't fail if file grab fails */ |
774 | unsigned needs_file_no_error : 1; | |
d3656344 JA |
775 | /* hash wq insertion if file is a regular file */ |
776 | unsigned hash_reg_file : 1; | |
777 | /* unbound wq insertion if file is a non-regular file */ | |
778 | unsigned unbound_nonreg_file : 1; | |
66f4af93 JA |
779 | /* opcode is not supported by this kernel */ |
780 | unsigned not_supported : 1; | |
8a72758c JA |
781 | /* set if opcode supports polled "wait" */ |
782 | unsigned pollin : 1; | |
783 | unsigned pollout : 1; | |
bcda7baa JA |
784 | /* op supports buffer selection */ |
785 | unsigned buffer_select : 1; | |
e8c2bc1f JA |
786 | /* must always have async data allocated */ |
787 | unsigned needs_async_data : 1; | |
27926b68 JA |
788 | /* should block plug */ |
789 | unsigned plug : 1; | |
e8c2bc1f JA |
790 | /* size of async data needed, if any */ |
791 | unsigned short async_size; | |
0f203765 | 792 | unsigned work_flags; |
d3656344 JA |
793 | }; |
794 | ||
0918682b | 795 | static const struct io_op_def io_op_defs[] = { |
0463b6c5 PB |
796 | [IORING_OP_NOP] = {}, |
797 | [IORING_OP_READV] = { | |
d3656344 JA |
798 | .needs_file = 1, |
799 | .unbound_nonreg_file = 1, | |
8a72758c | 800 | .pollin = 1, |
4d954c25 | 801 | .buffer_select = 1, |
e8c2bc1f | 802 | .needs_async_data = 1, |
27926b68 | 803 | .plug = 1, |
e8c2bc1f | 804 | .async_size = sizeof(struct io_async_rw), |
0f203765 | 805 | .work_flags = IO_WQ_WORK_MM | IO_WQ_WORK_BLKCG, |
d3656344 | 806 | }, |
0463b6c5 | 807 | [IORING_OP_WRITEV] = { |
d3656344 JA |
808 | .needs_file = 1, |
809 | .hash_reg_file = 1, | |
810 | .unbound_nonreg_file = 1, | |
8a72758c | 811 | .pollout = 1, |
e8c2bc1f | 812 | .needs_async_data = 1, |
27926b68 | 813 | .plug = 1, |
e8c2bc1f | 814 | .async_size = sizeof(struct io_async_rw), |
69228338 JA |
815 | .work_flags = IO_WQ_WORK_MM | IO_WQ_WORK_BLKCG | |
816 | IO_WQ_WORK_FSIZE, | |
d3656344 | 817 | }, |
0463b6c5 | 818 | [IORING_OP_FSYNC] = { |
d3656344 | 819 | .needs_file = 1, |
0f203765 | 820 | .work_flags = IO_WQ_WORK_BLKCG, |
d3656344 | 821 | }, |
0463b6c5 | 822 | [IORING_OP_READ_FIXED] = { |
d3656344 JA |
823 | .needs_file = 1, |
824 | .unbound_nonreg_file = 1, | |
8a72758c | 825 | .pollin = 1, |
27926b68 | 826 | .plug = 1, |
e8c2bc1f | 827 | .async_size = sizeof(struct io_async_rw), |
4017eb91 | 828 | .work_flags = IO_WQ_WORK_BLKCG | IO_WQ_WORK_MM, |
d3656344 | 829 | }, |
0463b6c5 | 830 | [IORING_OP_WRITE_FIXED] = { |
d3656344 JA |
831 | .needs_file = 1, |
832 | .hash_reg_file = 1, | |
833 | .unbound_nonreg_file = 1, | |
8a72758c | 834 | .pollout = 1, |
27926b68 | 835 | .plug = 1, |
e8c2bc1f | 836 | .async_size = sizeof(struct io_async_rw), |
4017eb91 JA |
837 | .work_flags = IO_WQ_WORK_BLKCG | IO_WQ_WORK_FSIZE | |
838 | IO_WQ_WORK_MM, | |
d3656344 | 839 | }, |
0463b6c5 | 840 | [IORING_OP_POLL_ADD] = { |
d3656344 JA |
841 | .needs_file = 1, |
842 | .unbound_nonreg_file = 1, | |
843 | }, | |
0463b6c5 PB |
844 | [IORING_OP_POLL_REMOVE] = {}, |
845 | [IORING_OP_SYNC_FILE_RANGE] = { | |
d3656344 | 846 | .needs_file = 1, |
0f203765 | 847 | .work_flags = IO_WQ_WORK_BLKCG, |
d3656344 | 848 | }, |
0463b6c5 | 849 | [IORING_OP_SENDMSG] = { |
d3656344 JA |
850 | .needs_file = 1, |
851 | .unbound_nonreg_file = 1, | |
8a72758c | 852 | .pollout = 1, |
e8c2bc1f JA |
853 | .needs_async_data = 1, |
854 | .async_size = sizeof(struct io_async_msghdr), | |
0f203765 JA |
855 | .work_flags = IO_WQ_WORK_MM | IO_WQ_WORK_BLKCG | |
856 | IO_WQ_WORK_FS, | |
d3656344 | 857 | }, |
0463b6c5 | 858 | [IORING_OP_RECVMSG] = { |
d3656344 JA |
859 | .needs_file = 1, |
860 | .unbound_nonreg_file = 1, | |
8a72758c | 861 | .pollin = 1, |
52de1fe1 | 862 | .buffer_select = 1, |
e8c2bc1f JA |
863 | .needs_async_data = 1, |
864 | .async_size = sizeof(struct io_async_msghdr), | |
0f203765 JA |
865 | .work_flags = IO_WQ_WORK_MM | IO_WQ_WORK_BLKCG | |
866 | IO_WQ_WORK_FS, | |
d3656344 | 867 | }, |
0463b6c5 | 868 | [IORING_OP_TIMEOUT] = { |
e8c2bc1f JA |
869 | .needs_async_data = 1, |
870 | .async_size = sizeof(struct io_timeout_data), | |
0f203765 | 871 | .work_flags = IO_WQ_WORK_MM, |
d3656344 | 872 | }, |
0463b6c5 PB |
873 | [IORING_OP_TIMEOUT_REMOVE] = {}, |
874 | [IORING_OP_ACCEPT] = { | |
d3656344 JA |
875 | .needs_file = 1, |
876 | .unbound_nonreg_file = 1, | |
8a72758c | 877 | .pollin = 1, |
0f203765 | 878 | .work_flags = IO_WQ_WORK_MM | IO_WQ_WORK_FILES, |
d3656344 | 879 | }, |
0463b6c5 PB |
880 | [IORING_OP_ASYNC_CANCEL] = {}, |
881 | [IORING_OP_LINK_TIMEOUT] = { | |
e8c2bc1f JA |
882 | .needs_async_data = 1, |
883 | .async_size = sizeof(struct io_timeout_data), | |
0f203765 | 884 | .work_flags = IO_WQ_WORK_MM, |
d3656344 | 885 | }, |
0463b6c5 | 886 | [IORING_OP_CONNECT] = { |
d3656344 JA |
887 | .needs_file = 1, |
888 | .unbound_nonreg_file = 1, | |
8a72758c | 889 | .pollout = 1, |
e8c2bc1f JA |
890 | .needs_async_data = 1, |
891 | .async_size = sizeof(struct io_async_connect), | |
0f203765 | 892 | .work_flags = IO_WQ_WORK_MM, |
d3656344 | 893 | }, |
0463b6c5 | 894 | [IORING_OP_FALLOCATE] = { |
d3656344 | 895 | .needs_file = 1, |
69228338 | 896 | .work_flags = IO_WQ_WORK_BLKCG | IO_WQ_WORK_FSIZE, |
d3656344 | 897 | }, |
0463b6c5 | 898 | [IORING_OP_OPENAT] = { |
0f203765 | 899 | .work_flags = IO_WQ_WORK_FILES | IO_WQ_WORK_BLKCG | |
14587a46 | 900 | IO_WQ_WORK_FS | IO_WQ_WORK_MM, |
d3656344 | 901 | }, |
0463b6c5 | 902 | [IORING_OP_CLOSE] = { |
fd2206e4 JA |
903 | .needs_file = 1, |
904 | .needs_file_no_error = 1, | |
0f203765 | 905 | .work_flags = IO_WQ_WORK_FILES | IO_WQ_WORK_BLKCG, |
d3656344 | 906 | }, |
0463b6c5 | 907 | [IORING_OP_FILES_UPDATE] = { |
0f203765 | 908 | .work_flags = IO_WQ_WORK_FILES | IO_WQ_WORK_MM, |
d3656344 | 909 | }, |
0463b6c5 | 910 | [IORING_OP_STATX] = { |
0f203765 JA |
911 | .work_flags = IO_WQ_WORK_FILES | IO_WQ_WORK_MM | |
912 | IO_WQ_WORK_FS | IO_WQ_WORK_BLKCG, | |
d3656344 | 913 | }, |
0463b6c5 | 914 | [IORING_OP_READ] = { |
3a6820f2 JA |
915 | .needs_file = 1, |
916 | .unbound_nonreg_file = 1, | |
8a72758c | 917 | .pollin = 1, |
bcda7baa | 918 | .buffer_select = 1, |
27926b68 | 919 | .plug = 1, |
e8c2bc1f | 920 | .async_size = sizeof(struct io_async_rw), |
0f203765 | 921 | .work_flags = IO_WQ_WORK_MM | IO_WQ_WORK_BLKCG, |
3a6820f2 | 922 | }, |
0463b6c5 | 923 | [IORING_OP_WRITE] = { |
3a6820f2 JA |
924 | .needs_file = 1, |
925 | .unbound_nonreg_file = 1, | |
8a72758c | 926 | .pollout = 1, |
27926b68 | 927 | .plug = 1, |
e8c2bc1f | 928 | .async_size = sizeof(struct io_async_rw), |
69228338 JA |
929 | .work_flags = IO_WQ_WORK_MM | IO_WQ_WORK_BLKCG | |
930 | IO_WQ_WORK_FSIZE, | |
3a6820f2 | 931 | }, |
0463b6c5 | 932 | [IORING_OP_FADVISE] = { |
4840e418 | 933 | .needs_file = 1, |
0f203765 | 934 | .work_flags = IO_WQ_WORK_BLKCG, |
4840e418 | 935 | }, |
0463b6c5 | 936 | [IORING_OP_MADVISE] = { |
0f203765 | 937 | .work_flags = IO_WQ_WORK_MM | IO_WQ_WORK_BLKCG, |
c1ca757b | 938 | }, |
0463b6c5 | 939 | [IORING_OP_SEND] = { |
fddaface JA |
940 | .needs_file = 1, |
941 | .unbound_nonreg_file = 1, | |
8a72758c | 942 | .pollout = 1, |
0f203765 | 943 | .work_flags = IO_WQ_WORK_MM | IO_WQ_WORK_BLKCG, |
fddaface | 944 | }, |
0463b6c5 | 945 | [IORING_OP_RECV] = { |
fddaface JA |
946 | .needs_file = 1, |
947 | .unbound_nonreg_file = 1, | |
8a72758c | 948 | .pollin = 1, |
bcda7baa | 949 | .buffer_select = 1, |
0f203765 | 950 | .work_flags = IO_WQ_WORK_MM | IO_WQ_WORK_BLKCG, |
fddaface | 951 | }, |
0463b6c5 | 952 | [IORING_OP_OPENAT2] = { |
0f203765 | 953 | .work_flags = IO_WQ_WORK_FILES | IO_WQ_WORK_FS | |
14587a46 | 954 | IO_WQ_WORK_BLKCG | IO_WQ_WORK_MM, |
cebdb986 | 955 | }, |
3e4827b0 JA |
956 | [IORING_OP_EPOLL_CTL] = { |
957 | .unbound_nonreg_file = 1, | |
0f203765 | 958 | .work_flags = IO_WQ_WORK_FILES, |
3e4827b0 | 959 | }, |
7d67af2c PB |
960 | [IORING_OP_SPLICE] = { |
961 | .needs_file = 1, | |
962 | .hash_reg_file = 1, | |
963 | .unbound_nonreg_file = 1, | |
0f203765 | 964 | .work_flags = IO_WQ_WORK_BLKCG, |
ddf0322d JA |
965 | }, |
966 | [IORING_OP_PROVIDE_BUFFERS] = {}, | |
067524e9 | 967 | [IORING_OP_REMOVE_BUFFERS] = {}, |
f2a8d5c7 PB |
968 | [IORING_OP_TEE] = { |
969 | .needs_file = 1, | |
970 | .hash_reg_file = 1, | |
971 | .unbound_nonreg_file = 1, | |
972 | }, | |
36f4fa68 JA |
973 | [IORING_OP_SHUTDOWN] = { |
974 | .needs_file = 1, | |
975 | }, | |
80a261fd JA |
976 | [IORING_OP_RENAMEAT] = { |
977 | .work_flags = IO_WQ_WORK_MM | IO_WQ_WORK_FILES | | |
978 | IO_WQ_WORK_FS | IO_WQ_WORK_BLKCG, | |
979 | }, | |
14a1143b JA |
980 | [IORING_OP_UNLINKAT] = { |
981 | .work_flags = IO_WQ_WORK_MM | IO_WQ_WORK_FILES | | |
982 | IO_WQ_WORK_FS | IO_WQ_WORK_BLKCG, | |
983 | }, | |
d3656344 JA |
984 | }; |
985 | ||
2e0464d4 BM |
986 | enum io_mem_account { |
987 | ACCT_LOCKED, | |
988 | ACCT_PINNED, | |
989 | }; | |
990 | ||
81b68a5c PB |
991 | static void __io_complete_rw(struct io_kiocb *req, long res, long res2, |
992 | struct io_comp_state *cs); | |
78e19bbe | 993 | static void io_cqring_fill_event(struct io_kiocb *req, long res); |
ec9c02ad | 994 | static void io_put_req(struct io_kiocb *req); |
216578e5 | 995 | static void io_put_req_deferred(struct io_kiocb *req, int nr); |
c40f6379 | 996 | static void io_double_put_req(struct io_kiocb *req); |
94ae5e77 | 997 | static struct io_kiocb *io_prep_linked_timeout(struct io_kiocb *req); |
7271ef3a | 998 | static void __io_queue_linked_timeout(struct io_kiocb *req); |
94ae5e77 | 999 | static void io_queue_linked_timeout(struct io_kiocb *req); |
05f3fb3c JA |
1000 | static int __io_sqe_files_update(struct io_ring_ctx *ctx, |
1001 | struct io_uring_files_update *ip, | |
1002 | unsigned nr_args); | |
3ca405eb | 1003 | static void __io_clean_op(struct io_kiocb *req); |
8371adf5 PB |
1004 | static struct file *io_file_get(struct io_submit_state *state, |
1005 | struct io_kiocb *req, int fd, bool fixed); | |
c1379e24 | 1006 | static void __io_queue_sqe(struct io_kiocb *req, struct io_comp_state *cs); |
4349f30e | 1007 | static void io_file_put_work(struct work_struct *work); |
de0617e4 | 1008 | |
b63534c4 JA |
1009 | static ssize_t io_import_iovec(int rw, struct io_kiocb *req, |
1010 | struct iovec **iovec, struct iov_iter *iter, | |
1011 | bool needs_lock); | |
ff6165b2 JA |
1012 | static int io_setup_async_rw(struct io_kiocb *req, const struct iovec *iovec, |
1013 | const struct iovec *fast_iov, | |
227c0c96 | 1014 | struct iov_iter *iter, bool force); |
de0617e4 | 1015 | |
2b188cc1 JA |
1016 | static struct kmem_cache *req_cachep; |
1017 | ||
0918682b | 1018 | static const struct file_operations io_uring_fops; |
2b188cc1 JA |
1019 | |
1020 | struct sock *io_uring_get_socket(struct file *file) | |
1021 | { | |
1022 | #if defined(CONFIG_UNIX) | |
1023 | if (file->f_op == &io_uring_fops) { | |
1024 | struct io_ring_ctx *ctx = file->private_data; | |
1025 | ||
1026 | return ctx->ring_sock->sk; | |
1027 | } | |
1028 | #endif | |
1029 | return NULL; | |
1030 | } | |
1031 | EXPORT_SYMBOL(io_uring_get_socket); | |
1032 | ||
f2f87370 PB |
1033 | #define io_for_each_link(pos, head) \ |
1034 | for (pos = (head); pos; pos = pos->link) | |
1035 | ||
3ca405eb PB |
1036 | static inline void io_clean_op(struct io_kiocb *req) |
1037 | { | |
bb175342 PB |
1038 | if (req->flags & (REQ_F_NEED_CLEANUP | REQ_F_BUFFER_SELECTED | |
1039 | REQ_F_INFLIGHT)) | |
3ca405eb PB |
1040 | __io_clean_op(req); |
1041 | } | |
1042 | ||
08d23634 PB |
1043 | static bool io_match_task(struct io_kiocb *head, |
1044 | struct task_struct *task, | |
1045 | struct files_struct *files) | |
1046 | { | |
1047 | struct io_kiocb *req; | |
1048 | ||
1049 | if (task && head->task != task) | |
1050 | return false; | |
1051 | if (!files) | |
1052 | return true; | |
1053 | ||
1054 | io_for_each_link(req, head) { | |
1055 | if ((req->flags & REQ_F_WORK_INITIALIZED) && | |
1056 | (req->work.flags & IO_WQ_WORK_FILES) && | |
1057 | req->work.identity->files == files) | |
1058 | return true; | |
1059 | } | |
1060 | return false; | |
1061 | } | |
1062 | ||
28cea78a | 1063 | static void io_sq_thread_drop_mm_files(void) |
c40f6379 | 1064 | { |
28cea78a | 1065 | struct files_struct *files = current->files; |
c40f6379 JA |
1066 | struct mm_struct *mm = current->mm; |
1067 | ||
1068 | if (mm) { | |
1069 | kthread_unuse_mm(mm); | |
1070 | mmput(mm); | |
4b70cf9d | 1071 | current->mm = NULL; |
c40f6379 | 1072 | } |
28cea78a JA |
1073 | if (files) { |
1074 | struct nsproxy *nsproxy = current->nsproxy; | |
1075 | ||
1076 | task_lock(current); | |
1077 | current->files = NULL; | |
1078 | current->nsproxy = NULL; | |
1079 | task_unlock(current); | |
1080 | put_files_struct(files); | |
1081 | put_nsproxy(nsproxy); | |
1082 | } | |
1083 | } | |
1084 | ||
1a38ffc9 | 1085 | static int __io_sq_thread_acquire_files(struct io_ring_ctx *ctx) |
28cea78a JA |
1086 | { |
1087 | if (!current->files) { | |
1088 | struct files_struct *files; | |
1089 | struct nsproxy *nsproxy; | |
1090 | ||
1091 | task_lock(ctx->sqo_task); | |
1092 | files = ctx->sqo_task->files; | |
1093 | if (!files) { | |
1094 | task_unlock(ctx->sqo_task); | |
1a38ffc9 | 1095 | return -EOWNERDEAD; |
28cea78a JA |
1096 | } |
1097 | atomic_inc(&files->count); | |
1098 | get_nsproxy(ctx->sqo_task->nsproxy); | |
1099 | nsproxy = ctx->sqo_task->nsproxy; | |
1100 | task_unlock(ctx->sqo_task); | |
1101 | ||
1102 | task_lock(current); | |
1103 | current->files = files; | |
1104 | current->nsproxy = nsproxy; | |
1105 | task_unlock(current); | |
1106 | } | |
1a38ffc9 | 1107 | return 0; |
c40f6379 JA |
1108 | } |
1109 | ||
1110 | static int __io_sq_thread_acquire_mm(struct io_ring_ctx *ctx) | |
1111 | { | |
4b70cf9d JA |
1112 | struct mm_struct *mm; |
1113 | ||
1114 | if (current->mm) | |
1115 | return 0; | |
1116 | ||
1117 | /* Should never happen */ | |
1118 | if (unlikely(!(ctx->flags & IORING_SETUP_SQPOLL))) | |
1119 | return -EFAULT; | |
1120 | ||
1121 | task_lock(ctx->sqo_task); | |
1122 | mm = ctx->sqo_task->mm; | |
1123 | if (unlikely(!mm || !mmget_not_zero(mm))) | |
1124 | mm = NULL; | |
1125 | task_unlock(ctx->sqo_task); | |
1126 | ||
1127 | if (mm) { | |
1128 | kthread_use_mm(mm); | |
1129 | return 0; | |
c40f6379 JA |
1130 | } |
1131 | ||
4b70cf9d | 1132 | return -EFAULT; |
c40f6379 JA |
1133 | } |
1134 | ||
28cea78a JA |
1135 | static int io_sq_thread_acquire_mm_files(struct io_ring_ctx *ctx, |
1136 | struct io_kiocb *req) | |
c40f6379 | 1137 | { |
28cea78a | 1138 | const struct io_op_def *def = &io_op_defs[req->opcode]; |
1a38ffc9 | 1139 | int ret; |
28cea78a JA |
1140 | |
1141 | if (def->work_flags & IO_WQ_WORK_MM) { | |
1a38ffc9 | 1142 | ret = __io_sq_thread_acquire_mm(ctx); |
28cea78a JA |
1143 | if (unlikely(ret)) |
1144 | return ret; | |
1145 | } | |
1146 | ||
1a38ffc9 PB |
1147 | if (def->needs_file || (def->work_flags & IO_WQ_WORK_FILES)) { |
1148 | ret = __io_sq_thread_acquire_files(ctx); | |
1149 | if (unlikely(ret)) | |
1150 | return ret; | |
1151 | } | |
28cea78a JA |
1152 | |
1153 | return 0; | |
c40f6379 JA |
1154 | } |
1155 | ||
91d8f519 DZ |
1156 | static void io_sq_thread_associate_blkcg(struct io_ring_ctx *ctx, |
1157 | struct cgroup_subsys_state **cur_css) | |
1158 | ||
1159 | { | |
1160 | #ifdef CONFIG_BLK_CGROUP | |
1161 | /* puts the old one when swapping */ | |
1162 | if (*cur_css != ctx->sqo_blkcg_css) { | |
1163 | kthread_associate_blkcg(ctx->sqo_blkcg_css); | |
1164 | *cur_css = ctx->sqo_blkcg_css; | |
1165 | } | |
1166 | #endif | |
1167 | } | |
1168 | ||
1169 | static void io_sq_thread_unassociate_blkcg(void) | |
1170 | { | |
1171 | #ifdef CONFIG_BLK_CGROUP | |
1172 | kthread_associate_blkcg(NULL); | |
1173 | #endif | |
1174 | } | |
1175 | ||
c40f6379 JA |
1176 | static inline void req_set_fail_links(struct io_kiocb *req) |
1177 | { | |
1178 | if ((req->flags & (REQ_F_LINK | REQ_F_HARDLINK)) == REQ_F_LINK) | |
1179 | req->flags |= REQ_F_FAIL_LINK; | |
1180 | } | |
4a38aed2 | 1181 | |
1e6fa521 JA |
1182 | /* |
1183 | * None of these are dereferenced, they are simply used to check if any of | |
1184 | * them have changed. If we're under current and check they are still the | |
1185 | * same, we're fine to grab references to them for actual out-of-line use. | |
1186 | */ | |
1187 | static void io_init_identity(struct io_identity *id) | |
1188 | { | |
1189 | id->files = current->files; | |
1190 | id->mm = current->mm; | |
1191 | #ifdef CONFIG_BLK_CGROUP | |
1192 | rcu_read_lock(); | |
1193 | id->blkcg_css = blkcg_css(); | |
1194 | rcu_read_unlock(); | |
1195 | #endif | |
1196 | id->creds = current_cred(); | |
1197 | id->nsproxy = current->nsproxy; | |
1198 | id->fs = current->fs; | |
1199 | id->fsize = rlimit(RLIMIT_FSIZE); | |
4ea33a97 JA |
1200 | #ifdef CONFIG_AUDIT |
1201 | id->loginuid = current->loginuid; | |
1202 | id->sessionid = current->sessionid; | |
1203 | #endif | |
1e6fa521 JA |
1204 | refcount_set(&id->count, 1); |
1205 | } | |
1206 | ||
ec99ca6c PB |
1207 | static inline void __io_req_init_async(struct io_kiocb *req) |
1208 | { | |
1209 | memset(&req->work, 0, sizeof(req->work)); | |
1210 | req->flags |= REQ_F_WORK_INITIALIZED; | |
1211 | } | |
1212 | ||
7cdaf587 XW |
1213 | /* |
1214 | * Note: must call io_req_init_async() for the first time you | |
1215 | * touch any members of io_wq_work. | |
1216 | */ | |
1217 | static inline void io_req_init_async(struct io_kiocb *req) | |
1218 | { | |
500a373d JA |
1219 | struct io_uring_task *tctx = current->io_uring; |
1220 | ||
7cdaf587 XW |
1221 | if (req->flags & REQ_F_WORK_INITIALIZED) |
1222 | return; | |
1223 | ||
ec99ca6c | 1224 | __io_req_init_async(req); |
500a373d JA |
1225 | |
1226 | /* Grab a ref if this isn't our static identity */ | |
1227 | req->work.identity = tctx->identity; | |
1228 | if (tctx->identity != &tctx->__identity) | |
1229 | refcount_inc(&req->work.identity->count); | |
7cdaf587 XW |
1230 | } |
1231 | ||
0cdaf760 PB |
1232 | static inline bool io_async_submit(struct io_ring_ctx *ctx) |
1233 | { | |
1234 | return ctx->flags & IORING_SETUP_SQPOLL; | |
1235 | } | |
1236 | ||
2b188cc1 JA |
1237 | static void io_ring_ctx_ref_free(struct percpu_ref *ref) |
1238 | { | |
1239 | struct io_ring_ctx *ctx = container_of(ref, struct io_ring_ctx, refs); | |
1240 | ||
0f158b4c | 1241 | complete(&ctx->ref_comp); |
2b188cc1 JA |
1242 | } |
1243 | ||
8eb7e2d0 PB |
1244 | static inline bool io_is_timeout_noseq(struct io_kiocb *req) |
1245 | { | |
1246 | return !req->timeout.off; | |
1247 | } | |
1248 | ||
2b188cc1 JA |
1249 | static struct io_ring_ctx *io_ring_ctx_alloc(struct io_uring_params *p) |
1250 | { | |
1251 | struct io_ring_ctx *ctx; | |
78076bb6 | 1252 | int hash_bits; |
2b188cc1 JA |
1253 | |
1254 | ctx = kzalloc(sizeof(*ctx), GFP_KERNEL); | |
1255 | if (!ctx) | |
1256 | return NULL; | |
1257 | ||
0ddf92e8 JA |
1258 | ctx->fallback_req = kmem_cache_alloc(req_cachep, GFP_KERNEL); |
1259 | if (!ctx->fallback_req) | |
1260 | goto err; | |
1261 | ||
78076bb6 JA |
1262 | /* |
1263 | * Use 5 bits less than the max cq entries, that should give us around | |
1264 | * 32 entries per hash list if totally full and uniformly spread. | |
1265 | */ | |
1266 | hash_bits = ilog2(p->cq_entries); | |
1267 | hash_bits -= 5; | |
1268 | if (hash_bits <= 0) | |
1269 | hash_bits = 1; | |
1270 | ctx->cancel_hash_bits = hash_bits; | |
1271 | ctx->cancel_hash = kmalloc((1U << hash_bits) * sizeof(struct hlist_head), | |
1272 | GFP_KERNEL); | |
1273 | if (!ctx->cancel_hash) | |
1274 | goto err; | |
1275 | __hash_init(ctx->cancel_hash, 1U << hash_bits); | |
1276 | ||
21482896 | 1277 | if (percpu_ref_init(&ctx->refs, io_ring_ctx_ref_free, |
206aefde JA |
1278 | PERCPU_REF_ALLOW_REINIT, GFP_KERNEL)) |
1279 | goto err; | |
2b188cc1 JA |
1280 | |
1281 | ctx->flags = p->flags; | |
90554200 | 1282 | init_waitqueue_head(&ctx->sqo_sq_wait); |
69fb2131 | 1283 | INIT_LIST_HEAD(&ctx->sqd_list); |
2b188cc1 | 1284 | init_waitqueue_head(&ctx->cq_wait); |
1d7bb1d5 | 1285 | INIT_LIST_HEAD(&ctx->cq_overflow_list); |
0f158b4c JA |
1286 | init_completion(&ctx->ref_comp); |
1287 | init_completion(&ctx->sq_thread_comp); | |
5a2e745d | 1288 | idr_init(&ctx->io_buffer_idr); |
071698e1 | 1289 | idr_init(&ctx->personality_idr); |
2b188cc1 JA |
1290 | mutex_init(&ctx->uring_lock); |
1291 | init_waitqueue_head(&ctx->wait); | |
1292 | spin_lock_init(&ctx->completion_lock); | |
540e32a0 | 1293 | INIT_LIST_HEAD(&ctx->iopoll_list); |
de0617e4 | 1294 | INIT_LIST_HEAD(&ctx->defer_list); |
5262f567 | 1295 | INIT_LIST_HEAD(&ctx->timeout_list); |
fcb323cc JA |
1296 | init_waitqueue_head(&ctx->inflight_wait); |
1297 | spin_lock_init(&ctx->inflight_lock); | |
1298 | INIT_LIST_HEAD(&ctx->inflight_list); | |
4a38aed2 JA |
1299 | INIT_DELAYED_WORK(&ctx->file_put_work, io_file_put_work); |
1300 | init_llist_head(&ctx->file_put_llist); | |
2b188cc1 | 1301 | return ctx; |
206aefde | 1302 | err: |
0ddf92e8 JA |
1303 | if (ctx->fallback_req) |
1304 | kmem_cache_free(req_cachep, ctx->fallback_req); | |
78076bb6 | 1305 | kfree(ctx->cancel_hash); |
206aefde JA |
1306 | kfree(ctx); |
1307 | return NULL; | |
2b188cc1 JA |
1308 | } |
1309 | ||
9cf7c104 | 1310 | static bool req_need_defer(struct io_kiocb *req, u32 seq) |
7adf4eaf | 1311 | { |
2bc9930e JA |
1312 | if (unlikely(req->flags & REQ_F_IO_DRAIN)) { |
1313 | struct io_ring_ctx *ctx = req->ctx; | |
a197f664 | 1314 | |
9cf7c104 | 1315 | return seq != ctx->cached_cq_tail |
2c3bac6d | 1316 | + READ_ONCE(ctx->cached_cq_overflow); |
2bc9930e | 1317 | } |
de0617e4 | 1318 | |
9d858b21 | 1319 | return false; |
de0617e4 JA |
1320 | } |
1321 | ||
de0617e4 | 1322 | static void __io_commit_cqring(struct io_ring_ctx *ctx) |
2b188cc1 | 1323 | { |
75b28aff | 1324 | struct io_rings *rings = ctx->rings; |
2b188cc1 | 1325 | |
07910158 PB |
1326 | /* order cqe stores with ring update */ |
1327 | smp_store_release(&rings->cq.tail, ctx->cached_cq_tail); | |
2b188cc1 | 1328 | |
07910158 PB |
1329 | if (wq_has_sleeper(&ctx->cq_wait)) { |
1330 | wake_up_interruptible(&ctx->cq_wait); | |
1331 | kill_fasync(&ctx->cq_fasync, SIGIO, POLL_IN); | |
2b188cc1 JA |
1332 | } |
1333 | } | |
1334 | ||
5c3462cf | 1335 | static void io_put_identity(struct io_uring_task *tctx, struct io_kiocb *req) |
1e6fa521 | 1336 | { |
500a373d | 1337 | if (req->work.identity == &tctx->__identity) |
1e6fa521 JA |
1338 | return; |
1339 | if (refcount_dec_and_test(&req->work.identity->count)) | |
1340 | kfree(req->work.identity); | |
1341 | } | |
1342 | ||
4edf20f9 | 1343 | static void io_req_clean_work(struct io_kiocb *req) |
18d9be1a | 1344 | { |
7cdaf587 | 1345 | if (!(req->flags & REQ_F_WORK_INITIALIZED)) |
4edf20f9 | 1346 | return; |
51a4cc11 JA |
1347 | |
1348 | req->flags &= ~REQ_F_WORK_INITIALIZED; | |
7cdaf587 | 1349 | |
dfead8a8 | 1350 | if (req->work.flags & IO_WQ_WORK_MM) { |
98447d65 | 1351 | mmdrop(req->work.identity->mm); |
dfead8a8 | 1352 | req->work.flags &= ~IO_WQ_WORK_MM; |
cccf0ee8 | 1353 | } |
91d8f519 | 1354 | #ifdef CONFIG_BLK_CGROUP |
dfead8a8 | 1355 | if (req->work.flags & IO_WQ_WORK_BLKCG) { |
98447d65 | 1356 | css_put(req->work.identity->blkcg_css); |
dfead8a8 JA |
1357 | req->work.flags &= ~IO_WQ_WORK_BLKCG; |
1358 | } | |
91d8f519 | 1359 | #endif |
dfead8a8 | 1360 | if (req->work.flags & IO_WQ_WORK_CREDS) { |
98447d65 | 1361 | put_cred(req->work.identity->creds); |
dfead8a8 | 1362 | req->work.flags &= ~IO_WQ_WORK_CREDS; |
cccf0ee8 | 1363 | } |
dfead8a8 | 1364 | if (req->work.flags & IO_WQ_WORK_FS) { |
98447d65 | 1365 | struct fs_struct *fs = req->work.identity->fs; |
51a4cc11 | 1366 | |
98447d65 | 1367 | spin_lock(&req->work.identity->fs->lock); |
ff002b30 JA |
1368 | if (--fs->users) |
1369 | fs = NULL; | |
98447d65 | 1370 | spin_unlock(&req->work.identity->fs->lock); |
ff002b30 JA |
1371 | if (fs) |
1372 | free_fs_struct(fs); | |
dfead8a8 | 1373 | req->work.flags &= ~IO_WQ_WORK_FS; |
ff002b30 | 1374 | } |
51a4cc11 | 1375 | |
5c3462cf | 1376 | io_put_identity(req->task->io_uring, req); |
561fb04a JA |
1377 | } |
1378 | ||
1e6fa521 JA |
1379 | /* |
1380 | * Create a private copy of io_identity, since some fields don't match | |
1381 | * the current context. | |
1382 | */ | |
1383 | static bool io_identity_cow(struct io_kiocb *req) | |
1384 | { | |
5c3462cf | 1385 | struct io_uring_task *tctx = current->io_uring; |
1e6fa521 JA |
1386 | const struct cred *creds = NULL; |
1387 | struct io_identity *id; | |
1388 | ||
1389 | if (req->work.flags & IO_WQ_WORK_CREDS) | |
1390 | creds = req->work.identity->creds; | |
1391 | ||
1392 | id = kmemdup(req->work.identity, sizeof(*id), GFP_KERNEL); | |
1393 | if (unlikely(!id)) { | |
1394 | req->work.flags |= IO_WQ_WORK_CANCEL; | |
1395 | return false; | |
1396 | } | |
1397 | ||
1398 | /* | |
1399 | * We can safely just re-init the creds we copied Either the field | |
1400 | * matches the current one, or we haven't grabbed it yet. The only | |
1401 | * exception is ->creds, through registered personalities, so handle | |
1402 | * that one separately. | |
1403 | */ | |
1404 | io_init_identity(id); | |
1405 | if (creds) | |
1406 | req->work.identity->creds = creds; | |
1407 | ||
1408 | /* add one for this request */ | |
1409 | refcount_inc(&id->count); | |
1410 | ||
cb8a8ae3 JA |
1411 | /* drop tctx and req identity references, if needed */ |
1412 | if (tctx->identity != &tctx->__identity && | |
1413 | refcount_dec_and_test(&tctx->identity->count)) | |
1414 | kfree(tctx->identity); | |
1415 | if (req->work.identity != &tctx->__identity && | |
1416 | refcount_dec_and_test(&req->work.identity->count)) | |
1e6fa521 JA |
1417 | kfree(req->work.identity); |
1418 | ||
1419 | req->work.identity = id; | |
500a373d | 1420 | tctx->identity = id; |
1e6fa521 JA |
1421 | return true; |
1422 | } | |
1423 | ||
1424 | static bool io_grab_identity(struct io_kiocb *req) | |
18d9be1a | 1425 | { |
d3656344 | 1426 | const struct io_op_def *def = &io_op_defs[req->opcode]; |
5c3462cf | 1427 | struct io_identity *id = req->work.identity; |
23329513 | 1428 | struct io_ring_ctx *ctx = req->ctx; |
54a91f3b | 1429 | |
69228338 JA |
1430 | if (def->work_flags & IO_WQ_WORK_FSIZE) { |
1431 | if (id->fsize != rlimit(RLIMIT_FSIZE)) | |
1432 | return false; | |
1433 | req->work.flags |= IO_WQ_WORK_FSIZE; | |
1434 | } | |
16d59803 | 1435 | |
dfead8a8 | 1436 | if (!(req->work.flags & IO_WQ_WORK_FILES) && |
1e6fa521 | 1437 | (def->work_flags & IO_WQ_WORK_FILES) && |
23329513 | 1438 | !(req->flags & REQ_F_NO_FILE_TABLE)) { |
1e6fa521 JA |
1439 | if (id->files != current->files || |
1440 | id->nsproxy != current->nsproxy) | |
1441 | return false; | |
1442 | atomic_inc(&id->files->count); | |
1443 | get_nsproxy(id->nsproxy); | |
23329513 PB |
1444 | req->flags |= REQ_F_INFLIGHT; |
1445 | ||
1446 | spin_lock_irq(&ctx->inflight_lock); | |
1447 | list_add(&req->inflight_entry, &ctx->inflight_list); | |
1448 | spin_unlock_irq(&ctx->inflight_lock); | |
dfead8a8 | 1449 | req->work.flags |= IO_WQ_WORK_FILES; |
dca9cf8b | 1450 | } |
91d8f519 | 1451 | #ifdef CONFIG_BLK_CGROUP |
dfead8a8 JA |
1452 | if (!(req->work.flags & IO_WQ_WORK_BLKCG) && |
1453 | (def->work_flags & IO_WQ_WORK_BLKCG)) { | |
91d8f519 | 1454 | rcu_read_lock(); |
1e6fa521 JA |
1455 | if (id->blkcg_css != blkcg_css()) { |
1456 | rcu_read_unlock(); | |
1457 | return false; | |
1458 | } | |
91d8f519 DZ |
1459 | /* |
1460 | * This should be rare, either the cgroup is dying or the task | |
1461 | * is moving cgroups. Just punt to root for the handful of ios. | |
1462 | */ | |
1e6fa521 | 1463 | if (css_tryget_online(id->blkcg_css)) |
dfead8a8 | 1464 | req->work.flags |= IO_WQ_WORK_BLKCG; |
91d8f519 DZ |
1465 | rcu_read_unlock(); |
1466 | } | |
1467 | #endif | |
dfead8a8 | 1468 | if (!(req->work.flags & IO_WQ_WORK_CREDS)) { |
1e6fa521 JA |
1469 | if (id->creds != current_cred()) |
1470 | return false; | |
1471 | get_cred(id->creds); | |
dfead8a8 JA |
1472 | req->work.flags |= IO_WQ_WORK_CREDS; |
1473 | } | |
4ea33a97 JA |
1474 | #ifdef CONFIG_AUDIT |
1475 | if (!uid_eq(current->loginuid, id->loginuid) || | |
1476 | current->sessionid != id->sessionid) | |
1477 | return false; | |
1478 | #endif | |
dfead8a8 JA |
1479 | if (!(req->work.flags & IO_WQ_WORK_FS) && |
1480 | (def->work_flags & IO_WQ_WORK_FS)) { | |
1e6fa521 JA |
1481 | if (current->fs != id->fs) |
1482 | return false; | |
1483 | spin_lock(&id->fs->lock); | |
1484 | if (!id->fs->in_exec) { | |
1485 | id->fs->users++; | |
dfead8a8 | 1486 | req->work.flags |= IO_WQ_WORK_FS; |
dca9cf8b PB |
1487 | } else { |
1488 | req->work.flags |= IO_WQ_WORK_CANCEL; | |
1489 | } | |
1490 | spin_unlock(¤t->fs->lock); | |
1491 | } | |
1e6fa521 JA |
1492 | |
1493 | return true; | |
1494 | } | |
1495 | ||
1496 | static void io_prep_async_work(struct io_kiocb *req) | |
1497 | { | |
1498 | const struct io_op_def *def = &io_op_defs[req->opcode]; | |
1e6fa521 | 1499 | struct io_ring_ctx *ctx = req->ctx; |
5c3462cf | 1500 | struct io_identity *id; |
1e6fa521 JA |
1501 | |
1502 | io_req_init_async(req); | |
5c3462cf | 1503 | id = req->work.identity; |
1e6fa521 | 1504 | |
feaadc4f PB |
1505 | if (req->flags & REQ_F_FORCE_ASYNC) |
1506 | req->work.flags |= IO_WQ_WORK_CONCURRENT; | |
1507 | ||
1e6fa521 JA |
1508 | if (req->flags & REQ_F_ISREG) { |
1509 | if (def->hash_reg_file || (ctx->flags & IORING_SETUP_IOPOLL)) | |
1510 | io_wq_hash_work(&req->work, file_inode(req->file)); | |
1511 | } else { | |
1512 | if (def->unbound_nonreg_file) | |
1513 | req->work.flags |= IO_WQ_WORK_UNBOUND; | |
1514 | } | |
1515 | ||
1516 | /* ->mm can never change on us */ | |
1517 | if (!(req->work.flags & IO_WQ_WORK_MM) && | |
1518 | (def->work_flags & IO_WQ_WORK_MM)) { | |
1519 | mmgrab(id->mm); | |
1520 | req->work.flags |= IO_WQ_WORK_MM; | |
1521 | } | |
1522 | ||
1523 | /* if we fail grabbing identity, we must COW, regrab, and retry */ | |
1524 | if (io_grab_identity(req)) | |
1525 | return; | |
1526 | ||
1527 | if (!io_identity_cow(req)) | |
1528 | return; | |
1529 | ||
1530 | /* can't fail at this point */ | |
1531 | if (!io_grab_identity(req)) | |
1532 | WARN_ON(1); | |
561fb04a | 1533 | } |
cccf0ee8 | 1534 | |
cbdcb435 | 1535 | static void io_prep_async_link(struct io_kiocb *req) |
561fb04a | 1536 | { |
cbdcb435 | 1537 | struct io_kiocb *cur; |
54a91f3b | 1538 | |
f2f87370 PB |
1539 | io_for_each_link(cur, req) |
1540 | io_prep_async_work(cur); | |
561fb04a JA |
1541 | } |
1542 | ||
7271ef3a | 1543 | static struct io_kiocb *__io_queue_async_work(struct io_kiocb *req) |
561fb04a | 1544 | { |
a197f664 | 1545 | struct io_ring_ctx *ctx = req->ctx; |
cbdcb435 | 1546 | struct io_kiocb *link = io_prep_linked_timeout(req); |
561fb04a | 1547 | |
8766dd51 PB |
1548 | trace_io_uring_queue_async_work(ctx, io_wq_is_hashed(&req->work), req, |
1549 | &req->work, req->flags); | |
1550 | io_wq_enqueue(ctx->io_wq, &req->work); | |
7271ef3a | 1551 | return link; |
18d9be1a JA |
1552 | } |
1553 | ||
cbdcb435 PB |
1554 | static void io_queue_async_work(struct io_kiocb *req) |
1555 | { | |
7271ef3a JA |
1556 | struct io_kiocb *link; |
1557 | ||
cbdcb435 PB |
1558 | /* init ->work of the whole link before punting */ |
1559 | io_prep_async_link(req); | |
7271ef3a JA |
1560 | link = __io_queue_async_work(req); |
1561 | ||
1562 | if (link) | |
1563 | io_queue_linked_timeout(link); | |
cbdcb435 PB |
1564 | } |
1565 | ||
5262f567 JA |
1566 | static void io_kill_timeout(struct io_kiocb *req) |
1567 | { | |
e8c2bc1f | 1568 | struct io_timeout_data *io = req->async_data; |
5262f567 JA |
1569 | int ret; |
1570 | ||
e8c2bc1f | 1571 | ret = hrtimer_try_to_cancel(&io->timer); |
5262f567 | 1572 | if (ret != -1) { |
01cec8c1 PB |
1573 | atomic_set(&req->ctx->cq_timeouts, |
1574 | atomic_read(&req->ctx->cq_timeouts) + 1); | |
135fcde8 | 1575 | list_del_init(&req->timeout.list); |
78e19bbe | 1576 | io_cqring_fill_event(req, 0); |
216578e5 | 1577 | io_put_req_deferred(req, 1); |
5262f567 JA |
1578 | } |
1579 | } | |
1580 | ||
76e1b642 JA |
1581 | /* |
1582 | * Returns true if we found and killed one or more timeouts | |
1583 | */ | |
6b81928d PB |
1584 | static bool io_kill_timeouts(struct io_ring_ctx *ctx, struct task_struct *tsk, |
1585 | struct files_struct *files) | |
5262f567 JA |
1586 | { |
1587 | struct io_kiocb *req, *tmp; | |
76e1b642 | 1588 | int canceled = 0; |
5262f567 JA |
1589 | |
1590 | spin_lock_irq(&ctx->completion_lock); | |
f3606e3a | 1591 | list_for_each_entry_safe(req, tmp, &ctx->timeout_list, timeout.list) { |
6b81928d | 1592 | if (io_match_task(req, tsk, files)) { |
f3606e3a | 1593 | io_kill_timeout(req); |
76e1b642 JA |
1594 | canceled++; |
1595 | } | |
f3606e3a | 1596 | } |
5262f567 | 1597 | spin_unlock_irq(&ctx->completion_lock); |
76e1b642 | 1598 | return canceled != 0; |
5262f567 JA |
1599 | } |
1600 | ||
04518945 | 1601 | static void __io_queue_deferred(struct io_ring_ctx *ctx) |
de0617e4 | 1602 | { |
04518945 | 1603 | do { |
27dc8338 PB |
1604 | struct io_defer_entry *de = list_first_entry(&ctx->defer_list, |
1605 | struct io_defer_entry, list); | |
7271ef3a | 1606 | struct io_kiocb *link; |
de0617e4 | 1607 | |
9cf7c104 | 1608 | if (req_need_defer(de->req, de->seq)) |
04518945 | 1609 | break; |
27dc8338 | 1610 | list_del_init(&de->list); |
cbdcb435 | 1611 | /* punt-init is done before queueing for defer */ |
7271ef3a JA |
1612 | link = __io_queue_async_work(de->req); |
1613 | if (link) { | |
1614 | __io_queue_linked_timeout(link); | |
1615 | /* drop submission reference */ | |
216578e5 | 1616 | io_put_req_deferred(link, 1); |
7271ef3a | 1617 | } |
27dc8338 | 1618 | kfree(de); |
04518945 PB |
1619 | } while (!list_empty(&ctx->defer_list)); |
1620 | } | |
1621 | ||
360428f8 | 1622 | static void io_flush_timeouts(struct io_ring_ctx *ctx) |
de0617e4 | 1623 | { |
360428f8 PB |
1624 | while (!list_empty(&ctx->timeout_list)) { |
1625 | struct io_kiocb *req = list_first_entry(&ctx->timeout_list, | |
135fcde8 | 1626 | struct io_kiocb, timeout.list); |
de0617e4 | 1627 | |
8eb7e2d0 | 1628 | if (io_is_timeout_noseq(req)) |
360428f8 | 1629 | break; |
bfe68a22 PB |
1630 | if (req->timeout.target_seq != ctx->cached_cq_tail |
1631 | - atomic_read(&ctx->cq_timeouts)) | |
360428f8 | 1632 | break; |
bfe68a22 | 1633 | |
135fcde8 | 1634 | list_del_init(&req->timeout.list); |
5262f567 | 1635 | io_kill_timeout(req); |
360428f8 PB |
1636 | } |
1637 | } | |
5262f567 | 1638 | |
360428f8 PB |
1639 | static void io_commit_cqring(struct io_ring_ctx *ctx) |
1640 | { | |
1641 | io_flush_timeouts(ctx); | |
de0617e4 JA |
1642 | __io_commit_cqring(ctx); |
1643 | ||
04518945 PB |
1644 | if (unlikely(!list_empty(&ctx->defer_list))) |
1645 | __io_queue_deferred(ctx); | |
de0617e4 JA |
1646 | } |
1647 | ||
90554200 JA |
1648 | static inline bool io_sqring_full(struct io_ring_ctx *ctx) |
1649 | { | |
1650 | struct io_rings *r = ctx->rings; | |
1651 | ||
1652 | return READ_ONCE(r->sq.tail) - ctx->cached_sq_head == r->sq_ring_entries; | |
1653 | } | |
1654 | ||
2b188cc1 JA |
1655 | static struct io_uring_cqe *io_get_cqring(struct io_ring_ctx *ctx) |
1656 | { | |
75b28aff | 1657 | struct io_rings *rings = ctx->rings; |
2b188cc1 JA |
1658 | unsigned tail; |
1659 | ||
1660 | tail = ctx->cached_cq_tail; | |
115e12e5 SB |
1661 | /* |
1662 | * writes to the cq entry need to come after reading head; the | |
1663 | * control dependency is enough as we're using WRITE_ONCE to | |
1664 | * fill the cq entry | |
1665 | */ | |
75b28aff | 1666 | if (tail - READ_ONCE(rings->cq.head) == rings->cq_ring_entries) |
2b188cc1 JA |
1667 | return NULL; |
1668 | ||
1669 | ctx->cached_cq_tail++; | |
75b28aff | 1670 | return &rings->cqes[tail & ctx->cq_mask]; |
2b188cc1 JA |
1671 | } |
1672 | ||
f2842ab5 JA |
1673 | static inline bool io_should_trigger_evfd(struct io_ring_ctx *ctx) |
1674 | { | |
f0b493e6 JA |
1675 | if (!ctx->cq_ev_fd) |
1676 | return false; | |
7e55a19c SG |
1677 | if (READ_ONCE(ctx->rings->cq_flags) & IORING_CQ_EVENTFD_DISABLED) |
1678 | return false; | |
f2842ab5 JA |
1679 | if (!ctx->eventfd_async) |
1680 | return true; | |
b41e9852 | 1681 | return io_wq_current_is_worker(); |
f2842ab5 JA |
1682 | } |
1683 | ||
b41e9852 | 1684 | static void io_cqring_ev_posted(struct io_ring_ctx *ctx) |
1d7bb1d5 JA |
1685 | { |
1686 | if (waitqueue_active(&ctx->wait)) | |
1687 | wake_up(&ctx->wait); | |
534ca6d6 JA |
1688 | if (ctx->sq_data && waitqueue_active(&ctx->sq_data->wait)) |
1689 | wake_up(&ctx->sq_data->wait); | |
b41e9852 | 1690 | if (io_should_trigger_evfd(ctx)) |
1d7bb1d5 JA |
1691 | eventfd_signal(ctx->cq_ev_fd, 1); |
1692 | } | |
1693 | ||
46930143 PB |
1694 | static void io_cqring_mark_overflow(struct io_ring_ctx *ctx) |
1695 | { | |
1696 | if (list_empty(&ctx->cq_overflow_list)) { | |
1697 | clear_bit(0, &ctx->sq_check_overflow); | |
1698 | clear_bit(0, &ctx->cq_check_overflow); | |
1699 | ctx->rings->sq_flags &= ~IORING_SQ_CQ_OVERFLOW; | |
1700 | } | |
1701 | } | |
1702 | ||
c4a2ed72 | 1703 | /* Returns true if there are no backlogged entries after the flush */ |
e6c8aa9a JA |
1704 | static bool io_cqring_overflow_flush(struct io_ring_ctx *ctx, bool force, |
1705 | struct task_struct *tsk, | |
1706 | struct files_struct *files) | |
1d7bb1d5 JA |
1707 | { |
1708 | struct io_rings *rings = ctx->rings; | |
e6c8aa9a | 1709 | struct io_kiocb *req, *tmp; |
1d7bb1d5 | 1710 | struct io_uring_cqe *cqe; |
1d7bb1d5 JA |
1711 | unsigned long flags; |
1712 | LIST_HEAD(list); | |
1713 | ||
1714 | if (!force) { | |
1715 | if (list_empty_careful(&ctx->cq_overflow_list)) | |
c4a2ed72 | 1716 | return true; |
1d7bb1d5 JA |
1717 | if ((ctx->cached_cq_tail - READ_ONCE(rings->cq.head) == |
1718 | rings->cq_ring_entries)) | |
c4a2ed72 | 1719 | return false; |
1d7bb1d5 JA |
1720 | } |
1721 | ||
1722 | spin_lock_irqsave(&ctx->completion_lock, flags); | |
1723 | ||
1724 | /* if force is set, the ring is going away. always drop after that */ | |
1725 | if (force) | |
69b3e546 | 1726 | ctx->cq_overflow_flushed = 1; |
1d7bb1d5 | 1727 | |
c4a2ed72 | 1728 | cqe = NULL; |
e6c8aa9a | 1729 | list_for_each_entry_safe(req, tmp, &ctx->cq_overflow_list, compl.list) { |
08d23634 | 1730 | if (!io_match_task(req, tsk, files)) |
e6c8aa9a JA |
1731 | continue; |
1732 | ||
1d7bb1d5 JA |
1733 | cqe = io_get_cqring(ctx); |
1734 | if (!cqe && !force) | |
1735 | break; | |
1736 | ||
40d8ddd4 | 1737 | list_move(&req->compl.list, &list); |
1d7bb1d5 JA |
1738 | if (cqe) { |
1739 | WRITE_ONCE(cqe->user_data, req->user_data); | |
1740 | WRITE_ONCE(cqe->res, req->result); | |
0f7e466b | 1741 | WRITE_ONCE(cqe->flags, req->compl.cflags); |
1d7bb1d5 | 1742 | } else { |
2c3bac6d | 1743 | ctx->cached_cq_overflow++; |
1d7bb1d5 | 1744 | WRITE_ONCE(ctx->rings->cq_overflow, |
2c3bac6d | 1745 | ctx->cached_cq_overflow); |
1d7bb1d5 JA |
1746 | } |
1747 | } | |
1748 | ||
1749 | io_commit_cqring(ctx); | |
46930143 PB |
1750 | io_cqring_mark_overflow(ctx); |
1751 | ||
1d7bb1d5 JA |
1752 | spin_unlock_irqrestore(&ctx->completion_lock, flags); |
1753 | io_cqring_ev_posted(ctx); | |
1754 | ||
1755 | while (!list_empty(&list)) { | |
40d8ddd4 PB |
1756 | req = list_first_entry(&list, struct io_kiocb, compl.list); |
1757 | list_del(&req->compl.list); | |
ec9c02ad | 1758 | io_put_req(req); |
1d7bb1d5 | 1759 | } |
c4a2ed72 JA |
1760 | |
1761 | return cqe != NULL; | |
1d7bb1d5 JA |
1762 | } |
1763 | ||
bcda7baa | 1764 | static void __io_cqring_fill_event(struct io_kiocb *req, long res, long cflags) |
2b188cc1 | 1765 | { |
78e19bbe | 1766 | struct io_ring_ctx *ctx = req->ctx; |
2b188cc1 JA |
1767 | struct io_uring_cqe *cqe; |
1768 | ||
78e19bbe | 1769 | trace_io_uring_complete(ctx, req->user_data, res); |
51c3ff62 | 1770 | |
2b188cc1 JA |
1771 | /* |
1772 | * If we can't get a cq entry, userspace overflowed the | |
1773 | * submission (by quite a lot). Increment the overflow count in | |
1774 | * the ring. | |
1775 | */ | |
1776 | cqe = io_get_cqring(ctx); | |
1d7bb1d5 | 1777 | if (likely(cqe)) { |
78e19bbe | 1778 | WRITE_ONCE(cqe->user_data, req->user_data); |
2b188cc1 | 1779 | WRITE_ONCE(cqe->res, res); |
bcda7baa | 1780 | WRITE_ONCE(cqe->flags, cflags); |
fdaf083c JA |
1781 | } else if (ctx->cq_overflow_flushed || |
1782 | atomic_read(&req->task->io_uring->in_idle)) { | |
0f212204 JA |
1783 | /* |
1784 | * If we're in ring overflow flush mode, or in task cancel mode, | |
1785 | * then we cannot store the request for later flushing, we need | |
1786 | * to drop it on the floor. | |
1787 | */ | |
2c3bac6d PB |
1788 | ctx->cached_cq_overflow++; |
1789 | WRITE_ONCE(ctx->rings->cq_overflow, ctx->cached_cq_overflow); | |
1d7bb1d5 | 1790 | } else { |
ad3eb2c8 JA |
1791 | if (list_empty(&ctx->cq_overflow_list)) { |
1792 | set_bit(0, &ctx->sq_check_overflow); | |
1793 | set_bit(0, &ctx->cq_check_overflow); | |
6d5f9049 | 1794 | ctx->rings->sq_flags |= IORING_SQ_CQ_OVERFLOW; |
ad3eb2c8 | 1795 | } |
40d8ddd4 | 1796 | io_clean_op(req); |
1d7bb1d5 | 1797 | req->result = res; |
0f7e466b | 1798 | req->compl.cflags = cflags; |
40d8ddd4 PB |
1799 | refcount_inc(&req->refs); |
1800 | list_add_tail(&req->compl.list, &ctx->cq_overflow_list); | |
2b188cc1 JA |
1801 | } |
1802 | } | |
1803 | ||
bcda7baa JA |
1804 | static void io_cqring_fill_event(struct io_kiocb *req, long res) |
1805 | { | |
1806 | __io_cqring_fill_event(req, res, 0); | |
1807 | } | |
1808 | ||
e1e16097 | 1809 | static void io_cqring_add_event(struct io_kiocb *req, long res, long cflags) |
2b188cc1 | 1810 | { |
78e19bbe | 1811 | struct io_ring_ctx *ctx = req->ctx; |
2b188cc1 JA |
1812 | unsigned long flags; |
1813 | ||
1814 | spin_lock_irqsave(&ctx->completion_lock, flags); | |
bcda7baa | 1815 | __io_cqring_fill_event(req, res, cflags); |
2b188cc1 JA |
1816 | io_commit_cqring(ctx); |
1817 | spin_unlock_irqrestore(&ctx->completion_lock, flags); | |
1818 | ||
8c838788 | 1819 | io_cqring_ev_posted(ctx); |
2b188cc1 JA |
1820 | } |
1821 | ||
229a7b63 | 1822 | static void io_submit_flush_completions(struct io_comp_state *cs) |
bcda7baa | 1823 | { |
229a7b63 JA |
1824 | struct io_ring_ctx *ctx = cs->ctx; |
1825 | ||
1826 | spin_lock_irq(&ctx->completion_lock); | |
1827 | while (!list_empty(&cs->list)) { | |
1828 | struct io_kiocb *req; | |
1829 | ||
3ca405eb PB |
1830 | req = list_first_entry(&cs->list, struct io_kiocb, compl.list); |
1831 | list_del(&req->compl.list); | |
0f7e466b | 1832 | __io_cqring_fill_event(req, req->result, req->compl.cflags); |
216578e5 PB |
1833 | |
1834 | /* | |
1835 | * io_free_req() doesn't care about completion_lock unless one | |
1836 | * of these flags is set. REQ_F_WORK_INITIALIZED is in the list | |
1837 | * because of a potential deadlock with req->work.fs->lock | |
1838 | */ | |
1839 | if (req->flags & (REQ_F_FAIL_LINK|REQ_F_LINK_TIMEOUT | |
1840 | |REQ_F_WORK_INITIALIZED)) { | |
229a7b63 JA |
1841 | spin_unlock_irq(&ctx->completion_lock); |
1842 | io_put_req(req); | |
1843 | spin_lock_irq(&ctx->completion_lock); | |
216578e5 PB |
1844 | } else { |
1845 | io_put_req(req); | |
229a7b63 JA |
1846 | } |
1847 | } | |
1848 | io_commit_cqring(ctx); | |
1849 | spin_unlock_irq(&ctx->completion_lock); | |
1850 | ||
1851 | io_cqring_ev_posted(ctx); | |
1852 | cs->nr = 0; | |
1853 | } | |
1854 | ||
1855 | static void __io_req_complete(struct io_kiocb *req, long res, unsigned cflags, | |
1856 | struct io_comp_state *cs) | |
1857 | { | |
1858 | if (!cs) { | |
1859 | io_cqring_add_event(req, res, cflags); | |
1860 | io_put_req(req); | |
1861 | } else { | |
3ca405eb | 1862 | io_clean_op(req); |
229a7b63 | 1863 | req->result = res; |
0f7e466b | 1864 | req->compl.cflags = cflags; |
3ca405eb | 1865 | list_add_tail(&req->compl.list, &cs->list); |
229a7b63 JA |
1866 | if (++cs->nr >= 32) |
1867 | io_submit_flush_completions(cs); | |
1868 | } | |
e1e16097 JA |
1869 | } |
1870 | ||
1871 | static void io_req_complete(struct io_kiocb *req, long res) | |
bcda7baa | 1872 | { |
229a7b63 | 1873 | __io_req_complete(req, res, 0, NULL); |
bcda7baa JA |
1874 | } |
1875 | ||
0ddf92e8 JA |
1876 | static inline bool io_is_fallback_req(struct io_kiocb *req) |
1877 | { | |
1878 | return req == (struct io_kiocb *) | |
1879 | ((unsigned long) req->ctx->fallback_req & ~1UL); | |
1880 | } | |
1881 | ||
1882 | static struct io_kiocb *io_get_fallback_req(struct io_ring_ctx *ctx) | |
1883 | { | |
1884 | struct io_kiocb *req; | |
1885 | ||
1886 | req = ctx->fallback_req; | |
dd461af6 | 1887 | if (!test_and_set_bit_lock(0, (unsigned long *) &ctx->fallback_req)) |
0ddf92e8 JA |
1888 | return req; |
1889 | ||
1890 | return NULL; | |
1891 | } | |
1892 | ||
0553b8bd PB |
1893 | static struct io_kiocb *io_alloc_req(struct io_ring_ctx *ctx, |
1894 | struct io_submit_state *state) | |
2b188cc1 | 1895 | { |
f6b6c7d6 | 1896 | if (!state->free_reqs) { |
291b2821 | 1897 | gfp_t gfp = GFP_KERNEL | __GFP_NOWARN; |
2579f913 JA |
1898 | size_t sz; |
1899 | int ret; | |
1900 | ||
1901 | sz = min_t(size_t, state->ios_left, ARRAY_SIZE(state->reqs)); | |
fd6fab2c JA |
1902 | ret = kmem_cache_alloc_bulk(req_cachep, gfp, sz, state->reqs); |
1903 | ||
1904 | /* | |
1905 | * Bulk alloc is all-or-nothing. If we fail to get a batch, | |
1906 | * retry single alloc to be on the safe side. | |
1907 | */ | |
1908 | if (unlikely(ret <= 0)) { | |
1909 | state->reqs[0] = kmem_cache_alloc(req_cachep, gfp); | |
1910 | if (!state->reqs[0]) | |
0ddf92e8 | 1911 | goto fallback; |
fd6fab2c JA |
1912 | ret = 1; |
1913 | } | |
291b2821 | 1914 | state->free_reqs = ret; |
2b188cc1 JA |
1915 | } |
1916 | ||
291b2821 PB |
1917 | state->free_reqs--; |
1918 | return state->reqs[state->free_reqs]; | |
0ddf92e8 | 1919 | fallback: |
0553b8bd | 1920 | return io_get_fallback_req(ctx); |
2b188cc1 JA |
1921 | } |
1922 | ||
8da11c19 PB |
1923 | static inline void io_put_file(struct io_kiocb *req, struct file *file, |
1924 | bool fixed) | |
1925 | { | |
1926 | if (fixed) | |
05589553 | 1927 | percpu_ref_put(req->fixed_file_refs); |
8da11c19 PB |
1928 | else |
1929 | fput(file); | |
1930 | } | |
1931 | ||
4edf20f9 | 1932 | static void io_dismantle_req(struct io_kiocb *req) |
2b188cc1 | 1933 | { |
3ca405eb | 1934 | io_clean_op(req); |
929a3af9 | 1935 | |
e8c2bc1f JA |
1936 | if (req->async_data) |
1937 | kfree(req->async_data); | |
8da11c19 PB |
1938 | if (req->file) |
1939 | io_put_file(req, req->file, (req->flags & REQ_F_FIXED_FILE)); | |
fcb323cc | 1940 | |
4edf20f9 | 1941 | io_req_clean_work(req); |
e65ef56d JA |
1942 | } |
1943 | ||
216578e5 | 1944 | static void __io_free_req(struct io_kiocb *req) |
c6ca97b3 | 1945 | { |
0f212204 | 1946 | struct io_uring_task *tctx = req->task->io_uring; |
51a4cc11 | 1947 | struct io_ring_ctx *ctx = req->ctx; |
c6ca97b3 | 1948 | |
216578e5 | 1949 | io_dismantle_req(req); |
c6ca97b3 | 1950 | |
d8a6df10 | 1951 | percpu_counter_dec(&tctx->inflight); |
fdaf083c | 1952 | if (atomic_read(&tctx->in_idle)) |
0f212204 | 1953 | wake_up(&tctx->wait); |
e3bc8e9d JA |
1954 | put_task_struct(req->task); |
1955 | ||
b1e50e54 PB |
1956 | if (likely(!io_is_fallback_req(req))) |
1957 | kmem_cache_free(req_cachep, req); | |
1958 | else | |
ecfc5177 PB |
1959 | clear_bit_unlock(0, (unsigned long *) &ctx->fallback_req); |
1960 | percpu_ref_put(&ctx->refs); | |
e65ef56d JA |
1961 | } |
1962 | ||
f2f87370 PB |
1963 | static inline void io_remove_next_linked(struct io_kiocb *req) |
1964 | { | |
1965 | struct io_kiocb *nxt = req->link; | |
1966 | ||
1967 | req->link = nxt->link; | |
1968 | nxt->link = NULL; | |
1969 | } | |
1970 | ||
c9abd7ad | 1971 | static void io_kill_linked_timeout(struct io_kiocb *req) |
2665abfd | 1972 | { |
a197f664 | 1973 | struct io_ring_ctx *ctx = req->ctx; |
7c86ffee | 1974 | struct io_kiocb *link; |
c9abd7ad PB |
1975 | bool cancelled = false; |
1976 | unsigned long flags; | |
7c86ffee | 1977 | |
c9abd7ad | 1978 | spin_lock_irqsave(&ctx->completion_lock, flags); |
f2f87370 PB |
1979 | link = req->link; |
1980 | ||
900fad45 PB |
1981 | /* |
1982 | * Can happen if a linked timeout fired and link had been like | |
1983 | * req -> link t-out -> link t-out [-> ...] | |
1984 | */ | |
c9abd7ad PB |
1985 | if (link && (link->flags & REQ_F_LTIMEOUT_ACTIVE)) { |
1986 | struct io_timeout_data *io = link->async_data; | |
1987 | int ret; | |
7c86ffee | 1988 | |
f2f87370 | 1989 | io_remove_next_linked(req); |
90cd7e42 | 1990 | link->timeout.head = NULL; |
c9abd7ad PB |
1991 | ret = hrtimer_try_to_cancel(&io->timer); |
1992 | if (ret != -1) { | |
1993 | io_cqring_fill_event(link, -ECANCELED); | |
1994 | io_commit_cqring(ctx); | |
1995 | cancelled = true; | |
1996 | } | |
1997 | } | |
7c86ffee | 1998 | req->flags &= ~REQ_F_LINK_TIMEOUT; |
216578e5 | 1999 | spin_unlock_irqrestore(&ctx->completion_lock, flags); |
ab0b6451 | 2000 | |
c9abd7ad | 2001 | if (cancelled) { |
7c86ffee | 2002 | io_cqring_ev_posted(ctx); |
c9abd7ad PB |
2003 | io_put_req(link); |
2004 | } | |
7c86ffee PB |
2005 | } |
2006 | ||
9e645e11 | 2007 | |
d148ca4b | 2008 | static void io_fail_links(struct io_kiocb *req) |
9e645e11 | 2009 | { |
f2f87370 | 2010 | struct io_kiocb *link, *nxt; |
2665abfd | 2011 | struct io_ring_ctx *ctx = req->ctx; |
d148ca4b | 2012 | unsigned long flags; |
9e645e11 | 2013 | |
d148ca4b | 2014 | spin_lock_irqsave(&ctx->completion_lock, flags); |
f2f87370 PB |
2015 | link = req->link; |
2016 | req->link = NULL; | |
9e645e11 | 2017 | |
f2f87370 PB |
2018 | while (link) { |
2019 | nxt = link->link; | |
2020 | link->link = NULL; | |
2665abfd | 2021 | |
f2f87370 | 2022 | trace_io_uring_fail_link(req, link); |
7c86ffee | 2023 | io_cqring_fill_event(link, -ECANCELED); |
216578e5 PB |
2024 | |
2025 | /* | |
2026 | * It's ok to free under spinlock as they're not linked anymore, | |
2027 | * but avoid REQ_F_WORK_INITIALIZED because it may deadlock on | |
2028 | * work.fs->lock. | |
2029 | */ | |
2030 | if (link->flags & REQ_F_WORK_INITIALIZED) | |
2031 | io_put_req_deferred(link, 2); | |
2032 | else | |
2033 | io_double_put_req(link); | |
f2f87370 | 2034 | link = nxt; |
9e645e11 | 2035 | } |
2665abfd | 2036 | io_commit_cqring(ctx); |
216578e5 | 2037 | spin_unlock_irqrestore(&ctx->completion_lock, flags); |
9e645e11 | 2038 | |
2665abfd | 2039 | io_cqring_ev_posted(ctx); |
9e645e11 JA |
2040 | } |
2041 | ||
3fa5e0f3 | 2042 | static struct io_kiocb *__io_req_find_next(struct io_kiocb *req) |
c69f8dbe | 2043 | { |
7c86ffee PB |
2044 | if (req->flags & REQ_F_LINK_TIMEOUT) |
2045 | io_kill_linked_timeout(req); | |
944e58bf | 2046 | |
9e645e11 JA |
2047 | /* |
2048 | * If LINK is set, we have dependent requests in this chain. If we | |
2049 | * didn't fail this request, queue the first one up, moving any other | |
2050 | * dependencies to the next request. In case of failure, fail the rest | |
2051 | * of the chain. | |
2052 | */ | |
f2f87370 PB |
2053 | if (likely(!(req->flags & REQ_F_FAIL_LINK))) { |
2054 | struct io_kiocb *nxt = req->link; | |
2055 | ||
2056 | req->link = NULL; | |
2057 | return nxt; | |
2058 | } | |
9b5f7bd9 PB |
2059 | io_fail_links(req); |
2060 | return NULL; | |
4d7dd462 | 2061 | } |
9e645e11 | 2062 | |
f2f87370 | 2063 | static inline struct io_kiocb *io_req_find_next(struct io_kiocb *req) |
3fa5e0f3 | 2064 | { |
f2f87370 | 2065 | if (likely(!(req->link) && !(req->flags & REQ_F_LINK_TIMEOUT))) |
3fa5e0f3 PB |
2066 | return NULL; |
2067 | return __io_req_find_next(req); | |
2068 | } | |
2069 | ||
87c4311f | 2070 | static int io_req_task_work_add(struct io_kiocb *req, bool twa_signal_ok) |
c2c4c83c JA |
2071 | { |
2072 | struct task_struct *tsk = req->task; | |
2073 | struct io_ring_ctx *ctx = req->ctx; | |
91989c70 JA |
2074 | enum task_work_notify_mode notify; |
2075 | int ret; | |
c2c4c83c | 2076 | |
6200b0ae JA |
2077 | if (tsk->flags & PF_EXITING) |
2078 | return -ESRCH; | |
2079 | ||
c2c4c83c | 2080 | /* |
0ba9c9ed JA |
2081 | * SQPOLL kernel thread doesn't need notification, just a wakeup. For |
2082 | * all other cases, use TWA_SIGNAL unconditionally to ensure we're | |
2083 | * processing task_work. There's no reliable way to tell if TWA_RESUME | |
2084 | * will do the job. | |
c2c4c83c | 2085 | */ |
91989c70 | 2086 | notify = TWA_NONE; |
fd7d6de2 | 2087 | if (!(ctx->flags & IORING_SETUP_SQPOLL) && twa_signal_ok) |
c2c4c83c JA |
2088 | notify = TWA_SIGNAL; |
2089 | ||
87c4311f | 2090 | ret = task_work_add(tsk, &req->task_work, notify); |
c2c4c83c JA |
2091 | if (!ret) |
2092 | wake_up_process(tsk); | |
0ba9c9ed | 2093 | |
c2c4c83c JA |
2094 | return ret; |
2095 | } | |
2096 | ||
c40f6379 JA |
2097 | static void __io_req_task_cancel(struct io_kiocb *req, int error) |
2098 | { | |
2099 | struct io_ring_ctx *ctx = req->ctx; | |
2100 | ||
2101 | spin_lock_irq(&ctx->completion_lock); | |
2102 | io_cqring_fill_event(req, error); | |
2103 | io_commit_cqring(ctx); | |
2104 | spin_unlock_irq(&ctx->completion_lock); | |
2105 | ||
2106 | io_cqring_ev_posted(ctx); | |
2107 | req_set_fail_links(req); | |
2108 | io_double_put_req(req); | |
2109 | } | |
2110 | ||
2111 | static void io_req_task_cancel(struct callback_head *cb) | |
2112 | { | |
2113 | struct io_kiocb *req = container_of(cb, struct io_kiocb, task_work); | |
87ceb6a6 | 2114 | struct io_ring_ctx *ctx = req->ctx; |
c40f6379 JA |
2115 | |
2116 | __io_req_task_cancel(req, -ECANCELED); | |
87ceb6a6 | 2117 | percpu_ref_put(&ctx->refs); |
c40f6379 JA |
2118 | } |
2119 | ||
2120 | static void __io_req_task_submit(struct io_kiocb *req) | |
2121 | { | |
2122 | struct io_ring_ctx *ctx = req->ctx; | |
2123 | ||
1a38ffc9 PB |
2124 | if (!__io_sq_thread_acquire_mm(ctx) && |
2125 | !__io_sq_thread_acquire_files(ctx)) { | |
c40f6379 | 2126 | mutex_lock(&ctx->uring_lock); |
c1379e24 | 2127 | __io_queue_sqe(req, NULL); |
c40f6379 JA |
2128 | mutex_unlock(&ctx->uring_lock); |
2129 | } else { | |
2130 | __io_req_task_cancel(req, -EFAULT); | |
2131 | } | |
2132 | } | |
2133 | ||
2134 | static void io_req_task_submit(struct callback_head *cb) | |
2135 | { | |
2136 | struct io_kiocb *req = container_of(cb, struct io_kiocb, task_work); | |
6d816e08 | 2137 | struct io_ring_ctx *ctx = req->ctx; |
c40f6379 JA |
2138 | |
2139 | __io_req_task_submit(req); | |
6d816e08 | 2140 | percpu_ref_put(&ctx->refs); |
c40f6379 JA |
2141 | } |
2142 | ||
2143 | static void io_req_task_queue(struct io_kiocb *req) | |
2144 | { | |
c40f6379 JA |
2145 | int ret; |
2146 | ||
2147 | init_task_work(&req->task_work, io_req_task_submit); | |
6d816e08 | 2148 | percpu_ref_get(&req->ctx->refs); |
c40f6379 | 2149 | |
87c4311f | 2150 | ret = io_req_task_work_add(req, true); |
c40f6379 | 2151 | if (unlikely(ret)) { |
c2c4c83c JA |
2152 | struct task_struct *tsk; |
2153 | ||
c40f6379 JA |
2154 | init_task_work(&req->task_work, io_req_task_cancel); |
2155 | tsk = io_wq_get_task(req->ctx->io_wq); | |
91989c70 | 2156 | task_work_add(tsk, &req->task_work, TWA_NONE); |
c2c4c83c | 2157 | wake_up_process(tsk); |
c40f6379 | 2158 | } |
c40f6379 JA |
2159 | } |
2160 | ||
f2f87370 | 2161 | static inline void io_queue_next(struct io_kiocb *req) |
c69f8dbe | 2162 | { |
9b5f7bd9 | 2163 | struct io_kiocb *nxt = io_req_find_next(req); |
944e58bf PB |
2164 | |
2165 | if (nxt) | |
906a8c3f | 2166 | io_req_task_queue(nxt); |
c69f8dbe JL |
2167 | } |
2168 | ||
c3524383 | 2169 | static void io_free_req(struct io_kiocb *req) |
7a743e22 | 2170 | { |
c3524383 PB |
2171 | io_queue_next(req); |
2172 | __io_free_req(req); | |
2173 | } | |
8766dd51 | 2174 | |
2d6500d4 PB |
2175 | struct req_batch { |
2176 | void *reqs[IO_IOPOLL_BATCH]; | |
2177 | int to_free; | |
7a743e22 | 2178 | |
5af1d13e PB |
2179 | struct task_struct *task; |
2180 | int task_refs; | |
2d6500d4 PB |
2181 | }; |
2182 | ||
5af1d13e PB |
2183 | static inline void io_init_req_batch(struct req_batch *rb) |
2184 | { | |
2185 | rb->to_free = 0; | |
2186 | rb->task_refs = 0; | |
2187 | rb->task = NULL; | |
2188 | } | |
2189 | ||
2d6500d4 PB |
2190 | static void __io_req_free_batch_flush(struct io_ring_ctx *ctx, |
2191 | struct req_batch *rb) | |
2192 | { | |
2193 | kmem_cache_free_bulk(req_cachep, rb->to_free, rb->reqs); | |
2194 | percpu_ref_put_many(&ctx->refs, rb->to_free); | |
2195 | rb->to_free = 0; | |
2196 | } | |
2197 | ||
2198 | static void io_req_free_batch_finish(struct io_ring_ctx *ctx, | |
2199 | struct req_batch *rb) | |
2200 | { | |
2201 | if (rb->to_free) | |
2202 | __io_req_free_batch_flush(ctx, rb); | |
5af1d13e | 2203 | if (rb->task) { |
d8a6df10 JA |
2204 | struct io_uring_task *tctx = rb->task->io_uring; |
2205 | ||
2206 | percpu_counter_sub(&tctx->inflight, rb->task_refs); | |
5af1d13e PB |
2207 | put_task_struct_many(rb->task, rb->task_refs); |
2208 | rb->task = NULL; | |
2209 | } | |
2d6500d4 PB |
2210 | } |
2211 | ||
2212 | static void io_req_free_batch(struct req_batch *rb, struct io_kiocb *req) | |
2213 | { | |
2214 | if (unlikely(io_is_fallback_req(req))) { | |
2215 | io_free_req(req); | |
2216 | return; | |
2217 | } | |
f2f87370 | 2218 | io_queue_next(req); |
2d6500d4 | 2219 | |
e3bc8e9d | 2220 | if (req->task != rb->task) { |
0f212204 | 2221 | if (rb->task) { |
d8a6df10 JA |
2222 | struct io_uring_task *tctx = rb->task->io_uring; |
2223 | ||
2224 | percpu_counter_sub(&tctx->inflight, rb->task_refs); | |
e3bc8e9d | 2225 | put_task_struct_many(rb->task, rb->task_refs); |
5af1d13e | 2226 | } |
e3bc8e9d JA |
2227 | rb->task = req->task; |
2228 | rb->task_refs = 0; | |
5af1d13e | 2229 | } |
e3bc8e9d | 2230 | rb->task_refs++; |
5af1d13e | 2231 | |
4edf20f9 | 2232 | io_dismantle_req(req); |
2d6500d4 PB |
2233 | rb->reqs[rb->to_free++] = req; |
2234 | if (unlikely(rb->to_free == ARRAY_SIZE(rb->reqs))) | |
2235 | __io_req_free_batch_flush(req->ctx, rb); | |
7a743e22 PB |
2236 | } |
2237 | ||
ba816ad6 JA |
2238 | /* |
2239 | * Drop reference to request, return next in chain (if there is one) if this | |
2240 | * was the last reference to this request. | |
2241 | */ | |
9b5f7bd9 | 2242 | static struct io_kiocb *io_put_req_find_next(struct io_kiocb *req) |
e65ef56d | 2243 | { |
9b5f7bd9 PB |
2244 | struct io_kiocb *nxt = NULL; |
2245 | ||
2a44f467 | 2246 | if (refcount_dec_and_test(&req->refs)) { |
9b5f7bd9 | 2247 | nxt = io_req_find_next(req); |
4d7dd462 | 2248 | __io_free_req(req); |
2a44f467 | 2249 | } |
9b5f7bd9 | 2250 | return nxt; |
2b188cc1 JA |
2251 | } |
2252 | ||
e65ef56d JA |
2253 | static void io_put_req(struct io_kiocb *req) |
2254 | { | |
2255 | if (refcount_dec_and_test(&req->refs)) | |
2256 | io_free_req(req); | |
2b188cc1 JA |
2257 | } |
2258 | ||
216578e5 PB |
2259 | static void io_put_req_deferred_cb(struct callback_head *cb) |
2260 | { | |
2261 | struct io_kiocb *req = container_of(cb, struct io_kiocb, task_work); | |
2262 | ||
2263 | io_free_req(req); | |
2264 | } | |
2265 | ||
2266 | static void io_free_req_deferred(struct io_kiocb *req) | |
2267 | { | |
2268 | int ret; | |
2269 | ||
2270 | init_task_work(&req->task_work, io_put_req_deferred_cb); | |
2271 | ret = io_req_task_work_add(req, true); | |
2272 | if (unlikely(ret)) { | |
2273 | struct task_struct *tsk; | |
2274 | ||
2275 | tsk = io_wq_get_task(req->ctx->io_wq); | |
91989c70 | 2276 | task_work_add(tsk, &req->task_work, TWA_NONE); |
216578e5 PB |
2277 | wake_up_process(tsk); |
2278 | } | |
2279 | } | |
2280 | ||
2281 | static inline void io_put_req_deferred(struct io_kiocb *req, int refs) | |
2282 | { | |
2283 | if (refcount_sub_and_test(refs, &req->refs)) | |
2284 | io_free_req_deferred(req); | |
2285 | } | |
2286 | ||
f4db7182 | 2287 | static struct io_wq_work *io_steal_work(struct io_kiocb *req) |
7a743e22 | 2288 | { |
6df1db6b | 2289 | struct io_kiocb *nxt; |
f4db7182 | 2290 | |
7a743e22 | 2291 | /* |
f4db7182 PB |
2292 | * A ref is owned by io-wq in which context we're. So, if that's the |
2293 | * last one, it's safe to steal next work. False negatives are Ok, | |
2294 | * it just will be re-punted async in io_put_work() | |
7a743e22 | 2295 | */ |
f4db7182 PB |
2296 | if (refcount_read(&req->refs) != 1) |
2297 | return NULL; | |
7a743e22 | 2298 | |
9b5f7bd9 | 2299 | nxt = io_req_find_next(req); |
6df1db6b | 2300 | return nxt ? &nxt->work : NULL; |
7a743e22 PB |
2301 | } |
2302 | ||
978db57e JA |
2303 | static void io_double_put_req(struct io_kiocb *req) |
2304 | { | |
2305 | /* drop both submit and complete references */ | |
2306 | if (refcount_sub_and_test(2, &req->refs)) | |
2307 | io_free_req(req); | |
2308 | } | |
2309 | ||
1d7bb1d5 | 2310 | static unsigned io_cqring_events(struct io_ring_ctx *ctx, bool noflush) |
a3a0e43f | 2311 | { |
84f97dc2 JA |
2312 | struct io_rings *rings = ctx->rings; |
2313 | ||
ad3eb2c8 JA |
2314 | if (test_bit(0, &ctx->cq_check_overflow)) { |
2315 | /* | |
2316 | * noflush == true is from the waitqueue handler, just ensure | |
2317 | * we wake up the task, and the next invocation will flush the | |
2318 | * entries. We cannot safely to it from here. | |
2319 | */ | |
2320 | if (noflush && !list_empty(&ctx->cq_overflow_list)) | |
2321 | return -1U; | |
1d7bb1d5 | 2322 | |
e6c8aa9a | 2323 | io_cqring_overflow_flush(ctx, false, NULL, NULL); |
ad3eb2c8 | 2324 | } |
1d7bb1d5 | 2325 | |
a3a0e43f JA |
2326 | /* See comment at the top of this file */ |
2327 | smp_rmb(); | |
ad3eb2c8 | 2328 | return ctx->cached_cq_tail - READ_ONCE(rings->cq.head); |
a3a0e43f JA |
2329 | } |
2330 | ||
fb5ccc98 PB |
2331 | static inline unsigned int io_sqring_entries(struct io_ring_ctx *ctx) |
2332 | { | |
2333 | struct io_rings *rings = ctx->rings; | |
2334 | ||
2335 | /* make sure SQ entry isn't read before tail */ | |
2336 | return smp_load_acquire(&rings->sq.tail) - ctx->cached_sq_head; | |
2337 | } | |
2338 | ||
8ff069bf | 2339 | static unsigned int io_put_kbuf(struct io_kiocb *req, struct io_buffer *kbuf) |
e94f141b | 2340 | { |
8ff069bf | 2341 | unsigned int cflags; |
e94f141b | 2342 | |
bcda7baa JA |
2343 | cflags = kbuf->bid << IORING_CQE_BUFFER_SHIFT; |
2344 | cflags |= IORING_CQE_F_BUFFER; | |
0e1b6fe3 | 2345 | req->flags &= ~REQ_F_BUFFER_SELECTED; |
bcda7baa JA |
2346 | kfree(kbuf); |
2347 | return cflags; | |
e94f141b JA |
2348 | } |
2349 | ||
8ff069bf | 2350 | static inline unsigned int io_put_rw_kbuf(struct io_kiocb *req) |
bcda7baa | 2351 | { |
4d954c25 | 2352 | struct io_buffer *kbuf; |
bcda7baa | 2353 | |
4d954c25 | 2354 | kbuf = (struct io_buffer *) (unsigned long) req->rw.addr; |
8ff069bf PB |
2355 | return io_put_kbuf(req, kbuf); |
2356 | } | |
2357 | ||
4c6e277c JA |
2358 | static inline bool io_run_task_work(void) |
2359 | { | |
6200b0ae JA |
2360 | /* |
2361 | * Not safe to run on exiting task, and the task_work handling will | |
2362 | * not add work to such a task. | |
2363 | */ | |
2364 | if (unlikely(current->flags & PF_EXITING)) | |
2365 | return false; | |
4c6e277c JA |
2366 | if (current->task_works) { |
2367 | __set_current_state(TASK_RUNNING); | |
2368 | task_work_run(); | |
2369 | return true; | |
2370 | } | |
2371 | ||
2372 | return false; | |
bcda7baa JA |
2373 | } |
2374 | ||
bbde017a XW |
2375 | static void io_iopoll_queue(struct list_head *again) |
2376 | { | |
2377 | struct io_kiocb *req; | |
2378 | ||
2379 | do { | |
d21ffe7e PB |
2380 | req = list_first_entry(again, struct io_kiocb, inflight_entry); |
2381 | list_del(&req->inflight_entry); | |
81b68a5c | 2382 | __io_complete_rw(req, -EAGAIN, 0, NULL); |
bbde017a XW |
2383 | } while (!list_empty(again)); |
2384 | } | |
2385 | ||
def596e9 JA |
2386 | /* |
2387 | * Find and free completed poll iocbs | |
2388 | */ | |
2389 | static void io_iopoll_complete(struct io_ring_ctx *ctx, unsigned int *nr_events, | |
2390 | struct list_head *done) | |
2391 | { | |
8237e045 | 2392 | struct req_batch rb; |
def596e9 | 2393 | struct io_kiocb *req; |
bbde017a XW |
2394 | LIST_HEAD(again); |
2395 | ||
2396 | /* order with ->result store in io_complete_rw_iopoll() */ | |
2397 | smp_rmb(); | |
def596e9 | 2398 | |
5af1d13e | 2399 | io_init_req_batch(&rb); |
def596e9 | 2400 | while (!list_empty(done)) { |
bcda7baa JA |
2401 | int cflags = 0; |
2402 | ||
d21ffe7e | 2403 | req = list_first_entry(done, struct io_kiocb, inflight_entry); |
bbde017a | 2404 | if (READ_ONCE(req->result) == -EAGAIN) { |
56450c20 | 2405 | req->result = 0; |
bbde017a | 2406 | req->iopoll_completed = 0; |
d21ffe7e | 2407 | list_move_tail(&req->inflight_entry, &again); |
bbde017a XW |
2408 | continue; |
2409 | } | |
d21ffe7e | 2410 | list_del(&req->inflight_entry); |
def596e9 | 2411 | |
bcda7baa | 2412 | if (req->flags & REQ_F_BUFFER_SELECTED) |
8ff069bf | 2413 | cflags = io_put_rw_kbuf(req); |
bcda7baa JA |
2414 | |
2415 | __io_cqring_fill_event(req, req->result, cflags); | |
def596e9 JA |
2416 | (*nr_events)++; |
2417 | ||
c3524383 | 2418 | if (refcount_dec_and_test(&req->refs)) |
2d6500d4 | 2419 | io_req_free_batch(&rb, req); |
def596e9 | 2420 | } |
def596e9 | 2421 | |
09bb8394 | 2422 | io_commit_cqring(ctx); |
32b2244a XW |
2423 | if (ctx->flags & IORING_SETUP_SQPOLL) |
2424 | io_cqring_ev_posted(ctx); | |
2d6500d4 | 2425 | io_req_free_batch_finish(ctx, &rb); |
581f9810 | 2426 | |
bbde017a XW |
2427 | if (!list_empty(&again)) |
2428 | io_iopoll_queue(&again); | |
581f9810 BM |
2429 | } |
2430 | ||
def596e9 JA |
2431 | static int io_do_iopoll(struct io_ring_ctx *ctx, unsigned int *nr_events, |
2432 | long min) | |
2433 | { | |
2434 | struct io_kiocb *req, *tmp; | |
2435 | LIST_HEAD(done); | |
2436 | bool spin; | |
2437 | int ret; | |
2438 | ||
2439 | /* | |
2440 | * Only spin for completions if we don't have multiple devices hanging | |
2441 | * off our complete list, and we're under the requested amount. | |
2442 | */ | |
2443 | spin = !ctx->poll_multi_file && *nr_events < min; | |
2444 | ||
2445 | ret = 0; | |
d21ffe7e | 2446 | list_for_each_entry_safe(req, tmp, &ctx->iopoll_list, inflight_entry) { |
9adbd45d | 2447 | struct kiocb *kiocb = &req->rw.kiocb; |
def596e9 JA |
2448 | |
2449 | /* | |
581f9810 BM |
2450 | * Move completed and retryable entries to our local lists. |
2451 | * If we find a request that requires polling, break out | |
2452 | * and complete those lists first, if we have entries there. | |
def596e9 | 2453 | */ |
65a6543d | 2454 | if (READ_ONCE(req->iopoll_completed)) { |
d21ffe7e | 2455 | list_move_tail(&req->inflight_entry, &done); |
def596e9 JA |
2456 | continue; |
2457 | } | |
2458 | if (!list_empty(&done)) | |
2459 | break; | |
2460 | ||
2461 | ret = kiocb->ki_filp->f_op->iopoll(kiocb, spin); | |
2462 | if (ret < 0) | |
2463 | break; | |
2464 | ||
3aadc23e PB |
2465 | /* iopoll may have completed current req */ |
2466 | if (READ_ONCE(req->iopoll_completed)) | |
d21ffe7e | 2467 | list_move_tail(&req->inflight_entry, &done); |
3aadc23e | 2468 | |
def596e9 JA |
2469 | if (ret && spin) |
2470 | spin = false; | |
2471 | ret = 0; | |
2472 | } | |
2473 | ||
2474 | if (!list_empty(&done)) | |
2475 | io_iopoll_complete(ctx, nr_events, &done); | |
2476 | ||
2477 | return ret; | |
2478 | } | |
2479 | ||
2480 | /* | |
d195a66e | 2481 | * Poll for a minimum of 'min' events. Note that if min == 0 we consider that a |
def596e9 JA |
2482 | * non-spinning poll check - we'll still enter the driver poll loop, but only |
2483 | * as a non-spinning completion check. | |
2484 | */ | |
2485 | static int io_iopoll_getevents(struct io_ring_ctx *ctx, unsigned int *nr_events, | |
2486 | long min) | |
2487 | { | |
540e32a0 | 2488 | while (!list_empty(&ctx->iopoll_list) && !need_resched()) { |
def596e9 JA |
2489 | int ret; |
2490 | ||
2491 | ret = io_do_iopoll(ctx, nr_events, min); | |
2492 | if (ret < 0) | |
2493 | return ret; | |
eba0a4dd | 2494 | if (*nr_events >= min) |
def596e9 JA |
2495 | return 0; |
2496 | } | |
2497 | ||
2498 | return 1; | |
2499 | } | |
2500 | ||
2501 | /* | |
2502 | * We can't just wait for polled events to come to us, we have to actively | |
2503 | * find and complete them. | |
2504 | */ | |
b2edc0a7 | 2505 | static void io_iopoll_try_reap_events(struct io_ring_ctx *ctx) |
def596e9 JA |
2506 | { |
2507 | if (!(ctx->flags & IORING_SETUP_IOPOLL)) | |
2508 | return; | |
2509 | ||
2510 | mutex_lock(&ctx->uring_lock); | |
540e32a0 | 2511 | while (!list_empty(&ctx->iopoll_list)) { |
def596e9 JA |
2512 | unsigned int nr_events = 0; |
2513 | ||
b2edc0a7 | 2514 | io_do_iopoll(ctx, &nr_events, 0); |
08f5439f | 2515 | |
b2edc0a7 PB |
2516 | /* let it sleep and repeat later if can't complete a request */ |
2517 | if (nr_events == 0) | |
2518 | break; | |
08f5439f JA |
2519 | /* |
2520 | * Ensure we allow local-to-the-cpu processing to take place, | |
2521 | * in this case we need to ensure that we reap all events. | |
3fcee5a6 | 2522 | * Also let task_work, etc. to progress by releasing the mutex |
08f5439f | 2523 | */ |
3fcee5a6 PB |
2524 | if (need_resched()) { |
2525 | mutex_unlock(&ctx->uring_lock); | |
2526 | cond_resched(); | |
2527 | mutex_lock(&ctx->uring_lock); | |
2528 | } | |
def596e9 JA |
2529 | } |
2530 | mutex_unlock(&ctx->uring_lock); | |
2531 | } | |
2532 | ||
7668b92a | 2533 | static int io_iopoll_check(struct io_ring_ctx *ctx, long min) |
def596e9 | 2534 | { |
7668b92a | 2535 | unsigned int nr_events = 0; |
2b2ed975 | 2536 | int iters = 0, ret = 0; |
500f9fba | 2537 | |
c7849be9 XW |
2538 | /* |
2539 | * We disallow the app entering submit/complete with polling, but we | |
2540 | * still need to lock the ring to prevent racing with polled issue | |
2541 | * that got punted to a workqueue. | |
2542 | */ | |
2543 | mutex_lock(&ctx->uring_lock); | |
def596e9 | 2544 | do { |
a3a0e43f JA |
2545 | /* |
2546 | * Don't enter poll loop if we already have events pending. | |
2547 | * If we do, we can potentially be spinning for commands that | |
2548 | * already triggered a CQE (eg in error). | |
2549 | */ | |
1d7bb1d5 | 2550 | if (io_cqring_events(ctx, false)) |
a3a0e43f JA |
2551 | break; |
2552 | ||
500f9fba JA |
2553 | /* |
2554 | * If a submit got punted to a workqueue, we can have the | |
2555 | * application entering polling for a command before it gets | |
2556 | * issued. That app will hold the uring_lock for the duration | |
2557 | * of the poll right here, so we need to take a breather every | |
2558 | * now and then to ensure that the issue has a chance to add | |
2559 | * the poll to the issued list. Otherwise we can spin here | |
2560 | * forever, while the workqueue is stuck trying to acquire the | |
2561 | * very same mutex. | |
2562 | */ | |
2563 | if (!(++iters & 7)) { | |
2564 | mutex_unlock(&ctx->uring_lock); | |
4c6e277c | 2565 | io_run_task_work(); |
500f9fba JA |
2566 | mutex_lock(&ctx->uring_lock); |
2567 | } | |
2568 | ||
7668b92a | 2569 | ret = io_iopoll_getevents(ctx, &nr_events, min); |
def596e9 JA |
2570 | if (ret <= 0) |
2571 | break; | |
2572 | ret = 0; | |
7668b92a | 2573 | } while (min && !nr_events && !need_resched()); |
def596e9 | 2574 | |
500f9fba | 2575 | mutex_unlock(&ctx->uring_lock); |
def596e9 JA |
2576 | return ret; |
2577 | } | |
2578 | ||
491381ce | 2579 | static void kiocb_end_write(struct io_kiocb *req) |
2b188cc1 | 2580 | { |
491381ce JA |
2581 | /* |
2582 | * Tell lockdep we inherited freeze protection from submission | |
2583 | * thread. | |
2584 | */ | |
2585 | if (req->flags & REQ_F_ISREG) { | |
2586 | struct inode *inode = file_inode(req->file); | |
2b188cc1 | 2587 | |
491381ce | 2588 | __sb_writers_acquired(inode->i_sb, SB_FREEZE_WRITE); |
2b188cc1 | 2589 | } |
491381ce | 2590 | file_end_write(req->file); |
2b188cc1 JA |
2591 | } |
2592 | ||
a1d7c393 JA |
2593 | static void io_complete_rw_common(struct kiocb *kiocb, long res, |
2594 | struct io_comp_state *cs) | |
2b188cc1 | 2595 | { |
9adbd45d | 2596 | struct io_kiocb *req = container_of(kiocb, struct io_kiocb, rw.kiocb); |
bcda7baa | 2597 | int cflags = 0; |
2b188cc1 | 2598 | |
491381ce JA |
2599 | if (kiocb->ki_flags & IOCB_WRITE) |
2600 | kiocb_end_write(req); | |
2b188cc1 | 2601 | |
4e88d6e7 JA |
2602 | if (res != req->result) |
2603 | req_set_fail_links(req); | |
bcda7baa | 2604 | if (req->flags & REQ_F_BUFFER_SELECTED) |
8ff069bf | 2605 | cflags = io_put_rw_kbuf(req); |
a1d7c393 | 2606 | __io_req_complete(req, res, cflags, cs); |
ba816ad6 JA |
2607 | } |
2608 | ||
b63534c4 JA |
2609 | #ifdef CONFIG_BLOCK |
2610 | static bool io_resubmit_prep(struct io_kiocb *req, int error) | |
2611 | { | |
2612 | struct iovec inline_vecs[UIO_FASTIOV], *iovec = inline_vecs; | |
2613 | ssize_t ret = -ECANCELED; | |
2614 | struct iov_iter iter; | |
2615 | int rw; | |
2616 | ||
2617 | if (error) { | |
2618 | ret = error; | |
2619 | goto end_req; | |
2620 | } | |
2621 | ||
2622 | switch (req->opcode) { | |
2623 | case IORING_OP_READV: | |
2624 | case IORING_OP_READ_FIXED: | |
2625 | case IORING_OP_READ: | |
2626 | rw = READ; | |
2627 | break; | |
2628 | case IORING_OP_WRITEV: | |
2629 | case IORING_OP_WRITE_FIXED: | |
2630 | case IORING_OP_WRITE: | |
2631 | rw = WRITE; | |
2632 | break; | |
2633 | default: | |
2634 | printk_once(KERN_WARNING "io_uring: bad opcode in resubmit %d\n", | |
2635 | req->opcode); | |
2636 | goto end_req; | |
2637 | } | |
2638 | ||
e8c2bc1f | 2639 | if (!req->async_data) { |
8f3d7496 JA |
2640 | ret = io_import_iovec(rw, req, &iovec, &iter, false); |
2641 | if (ret < 0) | |
2642 | goto end_req; | |
2643 | ret = io_setup_async_rw(req, iovec, inline_vecs, &iter, false); | |
2644 | if (!ret) | |
2645 | return true; | |
2646 | kfree(iovec); | |
2647 | } else { | |
b63534c4 | 2648 | return true; |
8f3d7496 | 2649 | } |
b63534c4 | 2650 | end_req: |
b63534c4 | 2651 | req_set_fail_links(req); |
b63534c4 JA |
2652 | return false; |
2653 | } | |
b63534c4 JA |
2654 | #endif |
2655 | ||
2656 | static bool io_rw_reissue(struct io_kiocb *req, long res) | |
2657 | { | |
2658 | #ifdef CONFIG_BLOCK | |
355afaeb | 2659 | umode_t mode = file_inode(req->file)->i_mode; |
b63534c4 JA |
2660 | int ret; |
2661 | ||
355afaeb JA |
2662 | if (!S_ISBLK(mode) && !S_ISREG(mode)) |
2663 | return false; | |
b63534c4 JA |
2664 | if ((res != -EAGAIN && res != -EOPNOTSUPP) || io_wq_current_is_worker()) |
2665 | return false; | |
2666 | ||
28cea78a | 2667 | ret = io_sq_thread_acquire_mm_files(req->ctx, req); |
6d816e08 | 2668 | |
fdee946d JA |
2669 | if (io_resubmit_prep(req, ret)) { |
2670 | refcount_inc(&req->refs); | |
2671 | io_queue_async_work(req); | |
b63534c4 | 2672 | return true; |
fdee946d JA |
2673 | } |
2674 | ||
b63534c4 JA |
2675 | #endif |
2676 | return false; | |
2677 | } | |
2678 | ||
a1d7c393 JA |
2679 | static void __io_complete_rw(struct io_kiocb *req, long res, long res2, |
2680 | struct io_comp_state *cs) | |
2681 | { | |
2682 | if (!io_rw_reissue(req, res)) | |
2683 | io_complete_rw_common(&req->rw.kiocb, res, cs); | |
ba816ad6 JA |
2684 | } |
2685 | ||
2686 | static void io_complete_rw(struct kiocb *kiocb, long res, long res2) | |
2687 | { | |
9adbd45d | 2688 | struct io_kiocb *req = container_of(kiocb, struct io_kiocb, rw.kiocb); |
ba816ad6 | 2689 | |
a1d7c393 | 2690 | __io_complete_rw(req, res, res2, NULL); |
2b188cc1 JA |
2691 | } |
2692 | ||
def596e9 JA |
2693 | static void io_complete_rw_iopoll(struct kiocb *kiocb, long res, long res2) |
2694 | { | |
9adbd45d | 2695 | struct io_kiocb *req = container_of(kiocb, struct io_kiocb, rw.kiocb); |
def596e9 | 2696 | |
491381ce JA |
2697 | if (kiocb->ki_flags & IOCB_WRITE) |
2698 | kiocb_end_write(req); | |
def596e9 | 2699 | |
2d7d6792 | 2700 | if (res != -EAGAIN && res != req->result) |
4e88d6e7 | 2701 | req_set_fail_links(req); |
bbde017a XW |
2702 | |
2703 | WRITE_ONCE(req->result, res); | |
2704 | /* order with io_poll_complete() checking ->result */ | |
cd664b0e PB |
2705 | smp_wmb(); |
2706 | WRITE_ONCE(req->iopoll_completed, 1); | |
def596e9 JA |
2707 | } |
2708 | ||
2709 | /* | |
2710 | * After the iocb has been issued, it's safe to be found on the poll list. | |
2711 | * Adding the kiocb to the list AFTER submission ensures that we don't | |
2712 | * find it from a io_iopoll_getevents() thread before the issuer is done | |
2713 | * accessing the kiocb cookie. | |
2714 | */ | |
2715 | static void io_iopoll_req_issued(struct io_kiocb *req) | |
2716 | { | |
2717 | struct io_ring_ctx *ctx = req->ctx; | |
2718 | ||
2719 | /* | |
2720 | * Track whether we have multiple files in our lists. This will impact | |
2721 | * how we do polling eventually, not spinning if we're on potentially | |
2722 | * different devices. | |
2723 | */ | |
540e32a0 | 2724 | if (list_empty(&ctx->iopoll_list)) { |
def596e9 JA |
2725 | ctx->poll_multi_file = false; |
2726 | } else if (!ctx->poll_multi_file) { | |
2727 | struct io_kiocb *list_req; | |
2728 | ||
540e32a0 | 2729 | list_req = list_first_entry(&ctx->iopoll_list, struct io_kiocb, |
d21ffe7e | 2730 | inflight_entry); |
9adbd45d | 2731 | if (list_req->file != req->file) |
def596e9 JA |
2732 | ctx->poll_multi_file = true; |
2733 | } | |
2734 | ||
2735 | /* | |
2736 | * For fast devices, IO may have already completed. If it has, add | |
2737 | * it to the front so we find it first. | |
2738 | */ | |
65a6543d | 2739 | if (READ_ONCE(req->iopoll_completed)) |
d21ffe7e | 2740 | list_add(&req->inflight_entry, &ctx->iopoll_list); |
def596e9 | 2741 | else |
d21ffe7e | 2742 | list_add_tail(&req->inflight_entry, &ctx->iopoll_list); |
bdcd3eab XW |
2743 | |
2744 | if ((ctx->flags & IORING_SETUP_SQPOLL) && | |
534ca6d6 JA |
2745 | wq_has_sleeper(&ctx->sq_data->wait)) |
2746 | wake_up(&ctx->sq_data->wait); | |
def596e9 JA |
2747 | } |
2748 | ||
9f13c35b | 2749 | static void __io_state_file_put(struct io_submit_state *state) |
9a56a232 | 2750 | { |
06ef3608 PB |
2751 | if (state->has_refs) |
2752 | fput_many(state->file, state->has_refs); | |
9f13c35b PB |
2753 | state->file = NULL; |
2754 | } | |
2755 | ||
2756 | static inline void io_state_file_put(struct io_submit_state *state) | |
2757 | { | |
2758 | if (state->file) | |
2759 | __io_state_file_put(state); | |
9a56a232 JA |
2760 | } |
2761 | ||
2762 | /* | |
2763 | * Get as many references to a file as we have IOs left in this submission, | |
2764 | * assuming most submissions are for one file, or at least that each file | |
2765 | * has more than one submission. | |
2766 | */ | |
8da11c19 | 2767 | static struct file *__io_file_get(struct io_submit_state *state, int fd) |
9a56a232 JA |
2768 | { |
2769 | if (!state) | |
2770 | return fget(fd); | |
2771 | ||
2772 | if (state->file) { | |
2773 | if (state->fd == fd) { | |
06ef3608 | 2774 | state->has_refs--; |
9a56a232 JA |
2775 | return state->file; |
2776 | } | |
9f13c35b | 2777 | __io_state_file_put(state); |
9a56a232 JA |
2778 | } |
2779 | state->file = fget_many(fd, state->ios_left); | |
2780 | if (!state->file) | |
2781 | return NULL; | |
2782 | ||
2783 | state->fd = fd; | |
71b547c0 | 2784 | state->has_refs = state->ios_left - 1; |
9a56a232 JA |
2785 | return state->file; |
2786 | } | |
2787 | ||
4503b767 JA |
2788 | static bool io_bdev_nowait(struct block_device *bdev) |
2789 | { | |
2790 | #ifdef CONFIG_BLOCK | |
9ba0d0c8 | 2791 | return !bdev || blk_queue_nowait(bdev_get_queue(bdev)); |
4503b767 JA |
2792 | #else |
2793 | return true; | |
2794 | #endif | |
2795 | } | |
2796 | ||
2b188cc1 JA |
2797 | /* |
2798 | * If we tracked the file through the SCM inflight mechanism, we could support | |
2799 | * any file. For now, just ensure that anything potentially problematic is done | |
2800 | * inline. | |
2801 | */ | |
af197f50 | 2802 | static bool io_file_supports_async(struct file *file, int rw) |
2b188cc1 JA |
2803 | { |
2804 | umode_t mode = file_inode(file)->i_mode; | |
2805 | ||
4503b767 JA |
2806 | if (S_ISBLK(mode)) { |
2807 | if (io_bdev_nowait(file->f_inode->i_bdev)) | |
2808 | return true; | |
2809 | return false; | |
2810 | } | |
2811 | if (S_ISCHR(mode) || S_ISSOCK(mode)) | |
2b188cc1 | 2812 | return true; |
4503b767 JA |
2813 | if (S_ISREG(mode)) { |
2814 | if (io_bdev_nowait(file->f_inode->i_sb->s_bdev) && | |
2815 | file->f_op != &io_uring_fops) | |
2816 | return true; | |
2817 | return false; | |
2818 | } | |
2b188cc1 | 2819 | |
c5b85625 JA |
2820 | /* any ->read/write should understand O_NONBLOCK */ |
2821 | if (file->f_flags & O_NONBLOCK) | |
2822 | return true; | |
2823 | ||
af197f50 JA |
2824 | if (!(file->f_mode & FMODE_NOWAIT)) |
2825 | return false; | |
2826 | ||
2827 | if (rw == READ) | |
2828 | return file->f_op->read_iter != NULL; | |
2829 | ||
2830 | return file->f_op->write_iter != NULL; | |
2b188cc1 JA |
2831 | } |
2832 | ||
a88fc400 | 2833 | static int io_prep_rw(struct io_kiocb *req, const struct io_uring_sqe *sqe) |
2b188cc1 | 2834 | { |
def596e9 | 2835 | struct io_ring_ctx *ctx = req->ctx; |
9adbd45d | 2836 | struct kiocb *kiocb = &req->rw.kiocb; |
09bb8394 JA |
2837 | unsigned ioprio; |
2838 | int ret; | |
2b188cc1 | 2839 | |
491381ce JA |
2840 | if (S_ISREG(file_inode(req->file)->i_mode)) |
2841 | req->flags |= REQ_F_ISREG; | |
2842 | ||
2b188cc1 | 2843 | kiocb->ki_pos = READ_ONCE(sqe->off); |
ba04291e JA |
2844 | if (kiocb->ki_pos == -1 && !(req->file->f_mode & FMODE_STREAM)) { |
2845 | req->flags |= REQ_F_CUR_POS; | |
2846 | kiocb->ki_pos = req->file->f_pos; | |
2847 | } | |
2b188cc1 | 2848 | kiocb->ki_hint = ki_hint_validate(file_write_hint(kiocb->ki_filp)); |
3e577dcd PB |
2849 | kiocb->ki_flags = iocb_flags(kiocb->ki_filp); |
2850 | ret = kiocb_set_rw_flags(kiocb, READ_ONCE(sqe->rw_flags)); | |
2851 | if (unlikely(ret)) | |
2852 | return ret; | |
2b188cc1 JA |
2853 | |
2854 | ioprio = READ_ONCE(sqe->ioprio); | |
2855 | if (ioprio) { | |
2856 | ret = ioprio_check_cap(ioprio); | |
2857 | if (ret) | |
09bb8394 | 2858 | return ret; |
2b188cc1 JA |
2859 | |
2860 | kiocb->ki_ioprio = ioprio; | |
2861 | } else | |
2862 | kiocb->ki_ioprio = get_current_ioprio(); | |
2863 | ||
8449eeda | 2864 | /* don't allow async punt if RWF_NOWAIT was requested */ |
c5b85625 | 2865 | if (kiocb->ki_flags & IOCB_NOWAIT) |
8449eeda SB |
2866 | req->flags |= REQ_F_NOWAIT; |
2867 | ||
def596e9 | 2868 | if (ctx->flags & IORING_SETUP_IOPOLL) { |
def596e9 JA |
2869 | if (!(kiocb->ki_flags & IOCB_DIRECT) || |
2870 | !kiocb->ki_filp->f_op->iopoll) | |
09bb8394 | 2871 | return -EOPNOTSUPP; |
2b188cc1 | 2872 | |
def596e9 JA |
2873 | kiocb->ki_flags |= IOCB_HIPRI; |
2874 | kiocb->ki_complete = io_complete_rw_iopoll; | |
65a6543d | 2875 | req->iopoll_completed = 0; |
def596e9 | 2876 | } else { |
09bb8394 JA |
2877 | if (kiocb->ki_flags & IOCB_HIPRI) |
2878 | return -EINVAL; | |
def596e9 JA |
2879 | kiocb->ki_complete = io_complete_rw; |
2880 | } | |
9adbd45d | 2881 | |
3529d8c2 JA |
2882 | req->rw.addr = READ_ONCE(sqe->addr); |
2883 | req->rw.len = READ_ONCE(sqe->len); | |
4f4eeba8 | 2884 | req->buf_index = READ_ONCE(sqe->buf_index); |
2b188cc1 | 2885 | return 0; |
2b188cc1 JA |
2886 | } |
2887 | ||
2888 | static inline void io_rw_done(struct kiocb *kiocb, ssize_t ret) | |
2889 | { | |
2890 | switch (ret) { | |
2891 | case -EIOCBQUEUED: | |
2892 | break; | |
2893 | case -ERESTARTSYS: | |
2894 | case -ERESTARTNOINTR: | |
2895 | case -ERESTARTNOHAND: | |
2896 | case -ERESTART_RESTARTBLOCK: | |
2897 | /* | |
2898 | * We can't just restart the syscall, since previously | |
2899 | * submitted sqes may already be in progress. Just fail this | |
2900 | * IO with EINTR. | |
2901 | */ | |
2902 | ret = -EINTR; | |
df561f66 | 2903 | fallthrough; |
2b188cc1 JA |
2904 | default: |
2905 | kiocb->ki_complete(kiocb, ret, 0); | |
2906 | } | |
2907 | } | |
2908 | ||
a1d7c393 JA |
2909 | static void kiocb_done(struct kiocb *kiocb, ssize_t ret, |
2910 | struct io_comp_state *cs) | |
ba816ad6 | 2911 | { |
ba04291e | 2912 | struct io_kiocb *req = container_of(kiocb, struct io_kiocb, rw.kiocb); |
e8c2bc1f | 2913 | struct io_async_rw *io = req->async_data; |
ba04291e | 2914 | |
227c0c96 | 2915 | /* add previously done IO, if any */ |
e8c2bc1f | 2916 | if (io && io->bytes_done > 0) { |
227c0c96 | 2917 | if (ret < 0) |
e8c2bc1f | 2918 | ret = io->bytes_done; |
227c0c96 | 2919 | else |
e8c2bc1f | 2920 | ret += io->bytes_done; |
227c0c96 JA |
2921 | } |
2922 | ||
ba04291e JA |
2923 | if (req->flags & REQ_F_CUR_POS) |
2924 | req->file->f_pos = kiocb->ki_pos; | |
bcaec089 | 2925 | if (ret >= 0 && kiocb->ki_complete == io_complete_rw) |
a1d7c393 | 2926 | __io_complete_rw(req, ret, 0, cs); |
ba816ad6 JA |
2927 | else |
2928 | io_rw_done(kiocb, ret); | |
2929 | } | |
2930 | ||
9adbd45d | 2931 | static ssize_t io_import_fixed(struct io_kiocb *req, int rw, |
7d009165 | 2932 | struct iov_iter *iter) |
edafccee | 2933 | { |
9adbd45d JA |
2934 | struct io_ring_ctx *ctx = req->ctx; |
2935 | size_t len = req->rw.len; | |
edafccee | 2936 | struct io_mapped_ubuf *imu; |
4be1c615 | 2937 | u16 index, buf_index = req->buf_index; |
edafccee JA |
2938 | size_t offset; |
2939 | u64 buf_addr; | |
2940 | ||
edafccee JA |
2941 | if (unlikely(buf_index >= ctx->nr_user_bufs)) |
2942 | return -EFAULT; | |
edafccee JA |
2943 | index = array_index_nospec(buf_index, ctx->nr_user_bufs); |
2944 | imu = &ctx->user_bufs[index]; | |
9adbd45d | 2945 | buf_addr = req->rw.addr; |
edafccee JA |
2946 | |
2947 | /* overflow */ | |
2948 | if (buf_addr + len < buf_addr) | |
2949 | return -EFAULT; | |
2950 | /* not inside the mapped region */ | |
2951 | if (buf_addr < imu->ubuf || buf_addr + len > imu->ubuf + imu->len) | |
2952 | return -EFAULT; | |
2953 | ||
2954 | /* | |
2955 | * May not be a start of buffer, set size appropriately | |
2956 | * and advance us to the beginning. | |
2957 | */ | |
2958 | offset = buf_addr - imu->ubuf; | |
2959 | iov_iter_bvec(iter, rw, imu->bvec, imu->nr_bvecs, offset + len); | |
bd11b3a3 JA |
2960 | |
2961 | if (offset) { | |
2962 | /* | |
2963 | * Don't use iov_iter_advance() here, as it's really slow for | |
2964 | * using the latter parts of a big fixed buffer - it iterates | |
2965 | * over each segment manually. We can cheat a bit here, because | |
2966 | * we know that: | |
2967 | * | |
2968 | * 1) it's a BVEC iter, we set it up | |
2969 | * 2) all bvecs are PAGE_SIZE in size, except potentially the | |
2970 | * first and last bvec | |
2971 | * | |
2972 | * So just find our index, and adjust the iterator afterwards. | |
2973 | * If the offset is within the first bvec (or the whole first | |
2974 | * bvec, just use iov_iter_advance(). This makes it easier | |
2975 | * since we can just skip the first segment, which may not | |
2976 | * be PAGE_SIZE aligned. | |
2977 | */ | |
2978 | const struct bio_vec *bvec = imu->bvec; | |
2979 | ||
2980 | if (offset <= bvec->bv_len) { | |
2981 | iov_iter_advance(iter, offset); | |
2982 | } else { | |
2983 | unsigned long seg_skip; | |
2984 | ||
2985 | /* skip first vec */ | |
2986 | offset -= bvec->bv_len; | |
2987 | seg_skip = 1 + (offset >> PAGE_SHIFT); | |
2988 | ||
2989 | iter->bvec = bvec + seg_skip; | |
2990 | iter->nr_segs -= seg_skip; | |
99c79f66 | 2991 | iter->count -= bvec->bv_len + offset; |
bd11b3a3 | 2992 | iter->iov_offset = offset & ~PAGE_MASK; |
bd11b3a3 JA |
2993 | } |
2994 | } | |
2995 | ||
5e559561 | 2996 | return len; |
edafccee JA |
2997 | } |
2998 | ||
bcda7baa JA |
2999 | static void io_ring_submit_unlock(struct io_ring_ctx *ctx, bool needs_lock) |
3000 | { | |
3001 | if (needs_lock) | |
3002 | mutex_unlock(&ctx->uring_lock); | |
3003 | } | |
3004 | ||
3005 | static void io_ring_submit_lock(struct io_ring_ctx *ctx, bool needs_lock) | |
3006 | { | |
3007 | /* | |
3008 | * "Normal" inline submissions always hold the uring_lock, since we | |
3009 | * grab it from the system call. Same is true for the SQPOLL offload. | |
3010 | * The only exception is when we've detached the request and issue it | |
3011 | * from an async worker thread, grab the lock for that case. | |
3012 | */ | |
3013 | if (needs_lock) | |
3014 | mutex_lock(&ctx->uring_lock); | |
3015 | } | |
3016 | ||
3017 | static struct io_buffer *io_buffer_select(struct io_kiocb *req, size_t *len, | |
3018 | int bgid, struct io_buffer *kbuf, | |
3019 | bool needs_lock) | |
3020 | { | |
3021 | struct io_buffer *head; | |
3022 | ||
3023 | if (req->flags & REQ_F_BUFFER_SELECTED) | |
3024 | return kbuf; | |
3025 | ||
3026 | io_ring_submit_lock(req->ctx, needs_lock); | |
3027 | ||
3028 | lockdep_assert_held(&req->ctx->uring_lock); | |
3029 | ||
3030 | head = idr_find(&req->ctx->io_buffer_idr, bgid); | |
3031 | if (head) { | |
3032 | if (!list_empty(&head->list)) { | |
3033 | kbuf = list_last_entry(&head->list, struct io_buffer, | |
3034 | list); | |
3035 | list_del(&kbuf->list); | |
3036 | } else { | |
3037 | kbuf = head; | |
3038 | idr_remove(&req->ctx->io_buffer_idr, bgid); | |
3039 | } | |
3040 | if (*len > kbuf->len) | |
3041 | *len = kbuf->len; | |
3042 | } else { | |
3043 | kbuf = ERR_PTR(-ENOBUFS); | |
3044 | } | |
3045 | ||
3046 | io_ring_submit_unlock(req->ctx, needs_lock); | |
3047 | ||
3048 | return kbuf; | |
3049 | } | |
3050 | ||
4d954c25 JA |
3051 | static void __user *io_rw_buffer_select(struct io_kiocb *req, size_t *len, |
3052 | bool needs_lock) | |
3053 | { | |
3054 | struct io_buffer *kbuf; | |
4f4eeba8 | 3055 | u16 bgid; |
4d954c25 JA |
3056 | |
3057 | kbuf = (struct io_buffer *) (unsigned long) req->rw.addr; | |
4f4eeba8 | 3058 | bgid = req->buf_index; |
4d954c25 JA |
3059 | kbuf = io_buffer_select(req, len, bgid, kbuf, needs_lock); |
3060 | if (IS_ERR(kbuf)) | |
3061 | return kbuf; | |
3062 | req->rw.addr = (u64) (unsigned long) kbuf; | |
3063 | req->flags |= REQ_F_BUFFER_SELECTED; | |
3064 | return u64_to_user_ptr(kbuf->addr); | |
3065 | } | |
3066 | ||
3067 | #ifdef CONFIG_COMPAT | |
3068 | static ssize_t io_compat_import(struct io_kiocb *req, struct iovec *iov, | |
3069 | bool needs_lock) | |
3070 | { | |
3071 | struct compat_iovec __user *uiov; | |
3072 | compat_ssize_t clen; | |
3073 | void __user *buf; | |
3074 | ssize_t len; | |
3075 | ||
3076 | uiov = u64_to_user_ptr(req->rw.addr); | |
3077 | if (!access_ok(uiov, sizeof(*uiov))) | |
3078 | return -EFAULT; | |
3079 | if (__get_user(clen, &uiov->iov_len)) | |
3080 | return -EFAULT; | |
3081 | if (clen < 0) | |
3082 | return -EINVAL; | |
3083 | ||
3084 | len = clen; | |
3085 | buf = io_rw_buffer_select(req, &len, needs_lock); | |
3086 | if (IS_ERR(buf)) | |
3087 | return PTR_ERR(buf); | |
3088 | iov[0].iov_base = buf; | |
3089 | iov[0].iov_len = (compat_size_t) len; | |
3090 | return 0; | |
3091 | } | |
3092 | #endif | |
3093 | ||
3094 | static ssize_t __io_iov_buffer_select(struct io_kiocb *req, struct iovec *iov, | |
3095 | bool needs_lock) | |
3096 | { | |
3097 | struct iovec __user *uiov = u64_to_user_ptr(req->rw.addr); | |
3098 | void __user *buf; | |
3099 | ssize_t len; | |
3100 | ||
3101 | if (copy_from_user(iov, uiov, sizeof(*uiov))) | |
3102 | return -EFAULT; | |
3103 | ||
3104 | len = iov[0].iov_len; | |
3105 | if (len < 0) | |
3106 | return -EINVAL; | |
3107 | buf = io_rw_buffer_select(req, &len, needs_lock); | |
3108 | if (IS_ERR(buf)) | |
3109 | return PTR_ERR(buf); | |
3110 | iov[0].iov_base = buf; | |
3111 | iov[0].iov_len = len; | |
3112 | return 0; | |
3113 | } | |
3114 | ||
3115 | static ssize_t io_iov_buffer_select(struct io_kiocb *req, struct iovec *iov, | |
3116 | bool needs_lock) | |
3117 | { | |
dddb3e26 JA |
3118 | if (req->flags & REQ_F_BUFFER_SELECTED) { |
3119 | struct io_buffer *kbuf; | |
3120 | ||
3121 | kbuf = (struct io_buffer *) (unsigned long) req->rw.addr; | |
3122 | iov[0].iov_base = u64_to_user_ptr(kbuf->addr); | |
3123 | iov[0].iov_len = kbuf->len; | |
4d954c25 | 3124 | return 0; |
dddb3e26 | 3125 | } |
4d954c25 JA |
3126 | if (!req->rw.len) |
3127 | return 0; | |
3128 | else if (req->rw.len > 1) | |
3129 | return -EINVAL; | |
3130 | ||
3131 | #ifdef CONFIG_COMPAT | |
3132 | if (req->ctx->compat) | |
3133 | return io_compat_import(req, iov, needs_lock); | |
3134 | #endif | |
3135 | ||
3136 | return __io_iov_buffer_select(req, iov, needs_lock); | |
3137 | } | |
3138 | ||
2846c481 | 3139 | static ssize_t io_import_iovec(int rw, struct io_kiocb *req, |
8452fd0c JA |
3140 | struct iovec **iovec, struct iov_iter *iter, |
3141 | bool needs_lock) | |
2b188cc1 | 3142 | { |
9adbd45d JA |
3143 | void __user *buf = u64_to_user_ptr(req->rw.addr); |
3144 | size_t sqe_len = req->rw.len; | |
4d954c25 | 3145 | ssize_t ret; |
edafccee JA |
3146 | u8 opcode; |
3147 | ||
d625c6ee | 3148 | opcode = req->opcode; |
7d009165 | 3149 | if (opcode == IORING_OP_READ_FIXED || opcode == IORING_OP_WRITE_FIXED) { |
edafccee | 3150 | *iovec = NULL; |
9adbd45d | 3151 | return io_import_fixed(req, rw, iter); |
edafccee | 3152 | } |
2b188cc1 | 3153 | |
bcda7baa | 3154 | /* buffer index only valid with fixed read/write, or buffer select */ |
4f4eeba8 | 3155 | if (req->buf_index && !(req->flags & REQ_F_BUFFER_SELECT)) |
9adbd45d JA |
3156 | return -EINVAL; |
3157 | ||
3a6820f2 | 3158 | if (opcode == IORING_OP_READ || opcode == IORING_OP_WRITE) { |
bcda7baa | 3159 | if (req->flags & REQ_F_BUFFER_SELECT) { |
4d954c25 | 3160 | buf = io_rw_buffer_select(req, &sqe_len, needs_lock); |
867a23ea | 3161 | if (IS_ERR(buf)) |
4d954c25 | 3162 | return PTR_ERR(buf); |
3f9d6441 | 3163 | req->rw.len = sqe_len; |
bcda7baa JA |
3164 | } |
3165 | ||
3a6820f2 JA |
3166 | ret = import_single_range(rw, buf, sqe_len, *iovec, iter); |
3167 | *iovec = NULL; | |
10fc72e4 | 3168 | return ret; |
3a6820f2 JA |
3169 | } |
3170 | ||
4d954c25 JA |
3171 | if (req->flags & REQ_F_BUFFER_SELECT) { |
3172 | ret = io_iov_buffer_select(req, *iovec, needs_lock); | |
3f9d6441 JA |
3173 | if (!ret) { |
3174 | ret = (*iovec)->iov_len; | |
3175 | iov_iter_init(iter, rw, *iovec, 1, ret); | |
3176 | } | |
4d954c25 JA |
3177 | *iovec = NULL; |
3178 | return ret; | |
3179 | } | |
3180 | ||
89cd35c5 CH |
3181 | return __import_iovec(rw, buf, sqe_len, UIO_FASTIOV, iovec, iter, |
3182 | req->ctx->compat); | |
2b188cc1 JA |
3183 | } |
3184 | ||
0fef9483 JA |
3185 | static inline loff_t *io_kiocb_ppos(struct kiocb *kiocb) |
3186 | { | |
5b09e37e | 3187 | return (kiocb->ki_filp->f_mode & FMODE_STREAM) ? NULL : &kiocb->ki_pos; |
0fef9483 JA |
3188 | } |
3189 | ||
31b51510 | 3190 | /* |
32960613 JA |
3191 | * For files that don't have ->read_iter() and ->write_iter(), handle them |
3192 | * by looping over ->read() or ->write() manually. | |
31b51510 | 3193 | */ |
4017eb91 | 3194 | static ssize_t loop_rw_iter(int rw, struct io_kiocb *req, struct iov_iter *iter) |
32960613 | 3195 | { |
4017eb91 JA |
3196 | struct kiocb *kiocb = &req->rw.kiocb; |
3197 | struct file *file = req->file; | |
32960613 JA |
3198 | ssize_t ret = 0; |
3199 | ||
3200 | /* | |
3201 | * Don't support polled IO through this interface, and we can't | |
3202 | * support non-blocking either. For the latter, this just causes | |
3203 | * the kiocb to be handled from an async context. | |
3204 | */ | |
3205 | if (kiocb->ki_flags & IOCB_HIPRI) | |
3206 | return -EOPNOTSUPP; | |
3207 | if (kiocb->ki_flags & IOCB_NOWAIT) | |
3208 | return -EAGAIN; | |
3209 | ||
3210 | while (iov_iter_count(iter)) { | |
311ae9e1 | 3211 | struct iovec iovec; |
32960613 JA |
3212 | ssize_t nr; |
3213 | ||
311ae9e1 PB |
3214 | if (!iov_iter_is_bvec(iter)) { |
3215 | iovec = iov_iter_iovec(iter); | |
3216 | } else { | |
4017eb91 JA |
3217 | iovec.iov_base = u64_to_user_ptr(req->rw.addr); |
3218 | iovec.iov_len = req->rw.len; | |
311ae9e1 PB |
3219 | } |
3220 | ||
32960613 JA |
3221 | if (rw == READ) { |
3222 | nr = file->f_op->read(file, iovec.iov_base, | |
0fef9483 | 3223 | iovec.iov_len, io_kiocb_ppos(kiocb)); |
32960613 JA |
3224 | } else { |
3225 | nr = file->f_op->write(file, iovec.iov_base, | |
0fef9483 | 3226 | iovec.iov_len, io_kiocb_ppos(kiocb)); |
32960613 JA |
3227 | } |
3228 | ||
3229 | if (nr < 0) { | |
3230 | if (!ret) | |
3231 | ret = nr; | |
3232 | break; | |
3233 | } | |
3234 | ret += nr; | |
3235 | if (nr != iovec.iov_len) | |
3236 | break; | |
4017eb91 JA |
3237 | req->rw.len -= nr; |
3238 | req->rw.addr += nr; | |
32960613 JA |
3239 | iov_iter_advance(iter, nr); |
3240 | } | |
3241 | ||
3242 | return ret; | |
3243 | } | |
3244 | ||
ff6165b2 JA |
3245 | static void io_req_map_rw(struct io_kiocb *req, const struct iovec *iovec, |
3246 | const struct iovec *fast_iov, struct iov_iter *iter) | |
f67676d1 | 3247 | { |
e8c2bc1f | 3248 | struct io_async_rw *rw = req->async_data; |
b64e3444 | 3249 | |
ff6165b2 | 3250 | memcpy(&rw->iter, iter, sizeof(*iter)); |
afb87658 | 3251 | rw->free_iovec = iovec; |
227c0c96 | 3252 | rw->bytes_done = 0; |
ff6165b2 JA |
3253 | /* can only be fixed buffers, no need to do anything */ |
3254 | if (iter->type == ITER_BVEC) | |
3255 | return; | |
b64e3444 | 3256 | if (!iovec) { |
ff6165b2 JA |
3257 | unsigned iov_off = 0; |
3258 | ||
3259 | rw->iter.iov = rw->fast_iov; | |
3260 | if (iter->iov != fast_iov) { | |
3261 | iov_off = iter->iov - fast_iov; | |
3262 | rw->iter.iov += iov_off; | |
3263 | } | |
3264 | if (rw->fast_iov != fast_iov) | |
3265 | memcpy(rw->fast_iov + iov_off, fast_iov + iov_off, | |
45097dae | 3266 | sizeof(struct iovec) * iter->nr_segs); |
99bc4c38 PB |
3267 | } else { |
3268 | req->flags |= REQ_F_NEED_CLEANUP; | |
f67676d1 JA |
3269 | } |
3270 | } | |
3271 | ||
e8c2bc1f | 3272 | static inline int __io_alloc_async_data(struct io_kiocb *req) |
3d9932a8 | 3273 | { |
e8c2bc1f JA |
3274 | WARN_ON_ONCE(!io_op_defs[req->opcode].async_size); |
3275 | req->async_data = kmalloc(io_op_defs[req->opcode].async_size, GFP_KERNEL); | |
3276 | return req->async_data == NULL; | |
3d9932a8 XW |
3277 | } |
3278 | ||
e8c2bc1f | 3279 | static int io_alloc_async_data(struct io_kiocb *req) |
f67676d1 | 3280 | { |
e8c2bc1f | 3281 | if (!io_op_defs[req->opcode].needs_async_data) |
d3656344 | 3282 | return 0; |
3d9932a8 | 3283 | |
e8c2bc1f | 3284 | return __io_alloc_async_data(req); |
b7bb4f7d JA |
3285 | } |
3286 | ||
ff6165b2 JA |
3287 | static int io_setup_async_rw(struct io_kiocb *req, const struct iovec *iovec, |
3288 | const struct iovec *fast_iov, | |
227c0c96 | 3289 | struct iov_iter *iter, bool force) |
b7bb4f7d | 3290 | { |
e8c2bc1f | 3291 | if (!force && !io_op_defs[req->opcode].needs_async_data) |
74566df3 | 3292 | return 0; |
e8c2bc1f JA |
3293 | if (!req->async_data) { |
3294 | if (__io_alloc_async_data(req)) | |
5d204bcf | 3295 | return -ENOMEM; |
b7bb4f7d | 3296 | |
ff6165b2 | 3297 | io_req_map_rw(req, iovec, fast_iov, iter); |
5d204bcf | 3298 | } |
b7bb4f7d | 3299 | return 0; |
f67676d1 JA |
3300 | } |
3301 | ||
73debe68 | 3302 | static inline int io_rw_prep_async(struct io_kiocb *req, int rw) |
c3e330a4 | 3303 | { |
e8c2bc1f | 3304 | struct io_async_rw *iorw = req->async_data; |
f4bff104 | 3305 | struct iovec *iov = iorw->fast_iov; |
c3e330a4 PB |
3306 | ssize_t ret; |
3307 | ||
2846c481 | 3308 | ret = io_import_iovec(rw, req, &iov, &iorw->iter, false); |
c3e330a4 PB |
3309 | if (unlikely(ret < 0)) |
3310 | return ret; | |
3311 | ||
ab0b196c PB |
3312 | iorw->bytes_done = 0; |
3313 | iorw->free_iovec = iov; | |
3314 | if (iov) | |
3315 | req->flags |= REQ_F_NEED_CLEANUP; | |
c3e330a4 PB |
3316 | return 0; |
3317 | } | |
3318 | ||
73debe68 | 3319 | static int io_read_prep(struct io_kiocb *req, const struct io_uring_sqe *sqe) |
f67676d1 JA |
3320 | { |
3321 | ssize_t ret; | |
3322 | ||
a88fc400 | 3323 | ret = io_prep_rw(req, sqe); |
3529d8c2 JA |
3324 | if (ret) |
3325 | return ret; | |
f67676d1 | 3326 | |
3529d8c2 JA |
3327 | if (unlikely(!(req->file->f_mode & FMODE_READ))) |
3328 | return -EBADF; | |
f67676d1 | 3329 | |
5f798bea | 3330 | /* either don't need iovec imported or already have it */ |
2d199895 | 3331 | if (!req->async_data) |
3529d8c2 | 3332 | return 0; |
73debe68 | 3333 | return io_rw_prep_async(req, READ); |
f67676d1 JA |
3334 | } |
3335 | ||
c1dd91d1 JA |
3336 | /* |
3337 | * This is our waitqueue callback handler, registered through lock_page_async() | |
3338 | * when we initially tried to do the IO with the iocb armed our waitqueue. | |
3339 | * This gets called when the page is unlocked, and we generally expect that to | |
3340 | * happen when the page IO is completed and the page is now uptodate. This will | |
3341 | * queue a task_work based retry of the operation, attempting to copy the data | |
3342 | * again. If the latter fails because the page was NOT uptodate, then we will | |
3343 | * do a thread based blocking retry of the operation. That's the unexpected | |
3344 | * slow path. | |
3345 | */ | |
bcf5a063 JA |
3346 | static int io_async_buf_func(struct wait_queue_entry *wait, unsigned mode, |
3347 | int sync, void *arg) | |
3348 | { | |
3349 | struct wait_page_queue *wpq; | |
3350 | struct io_kiocb *req = wait->private; | |
bcf5a063 | 3351 | struct wait_page_key *key = arg; |
bcf5a063 JA |
3352 | int ret; |
3353 | ||
3354 | wpq = container_of(wait, struct wait_page_queue, wait); | |
3355 | ||
cdc8fcb4 LT |
3356 | if (!wake_page_match(wpq, key)) |
3357 | return 0; | |
3358 | ||
c8d317aa | 3359 | req->rw.kiocb.ki_flags &= ~IOCB_WAITQ; |
bcf5a063 JA |
3360 | list_del_init(&wait->entry); |
3361 | ||
e7375122 | 3362 | init_task_work(&req->task_work, io_req_task_submit); |
6d816e08 JA |
3363 | percpu_ref_get(&req->ctx->refs); |
3364 | ||
bcf5a063 JA |
3365 | /* submit ref gets dropped, acquire a new one */ |
3366 | refcount_inc(&req->refs); | |
87c4311f | 3367 | ret = io_req_task_work_add(req, true); |
bcf5a063 | 3368 | if (unlikely(ret)) { |
c2c4c83c JA |
3369 | struct task_struct *tsk; |
3370 | ||
bcf5a063 | 3371 | /* queue just for cancelation */ |
e7375122 | 3372 | init_task_work(&req->task_work, io_req_task_cancel); |
bcf5a063 | 3373 | tsk = io_wq_get_task(req->ctx->io_wq); |
91989c70 | 3374 | task_work_add(tsk, &req->task_work, TWA_NONE); |
c2c4c83c | 3375 | wake_up_process(tsk); |
bcf5a063 | 3376 | } |
bcf5a063 JA |
3377 | return 1; |
3378 | } | |
3379 | ||
c1dd91d1 JA |
3380 | /* |
3381 | * This controls whether a given IO request should be armed for async page | |
3382 | * based retry. If we return false here, the request is handed to the async | |
3383 | * worker threads for retry. If we're doing buffered reads on a regular file, | |
3384 | * we prepare a private wait_page_queue entry and retry the operation. This | |
3385 | * will either succeed because the page is now uptodate and unlocked, or it | |
3386 | * will register a callback when the page is unlocked at IO completion. Through | |
3387 | * that callback, io_uring uses task_work to setup a retry of the operation. | |
3388 | * That retry will attempt the buffered read again. The retry will generally | |
3389 | * succeed, or in rare cases where it fails, we then fall back to using the | |
3390 | * async worker threads for a blocking retry. | |
3391 | */ | |
227c0c96 | 3392 | static bool io_rw_should_retry(struct io_kiocb *req) |
f67676d1 | 3393 | { |
e8c2bc1f JA |
3394 | struct io_async_rw *rw = req->async_data; |
3395 | struct wait_page_queue *wait = &rw->wpq; | |
bcf5a063 | 3396 | struct kiocb *kiocb = &req->rw.kiocb; |
f67676d1 | 3397 | |
bcf5a063 JA |
3398 | /* never retry for NOWAIT, we just complete with -EAGAIN */ |
3399 | if (req->flags & REQ_F_NOWAIT) | |
3400 | return false; | |
f67676d1 | 3401 | |
227c0c96 | 3402 | /* Only for buffered IO */ |
3b2a4439 | 3403 | if (kiocb->ki_flags & (IOCB_DIRECT | IOCB_HIPRI)) |
bcf5a063 | 3404 | return false; |
3b2a4439 | 3405 | |
bcf5a063 JA |
3406 | /* |
3407 | * just use poll if we can, and don't attempt if the fs doesn't | |
3408 | * support callback based unlocks | |
3409 | */ | |
3410 | if (file_can_poll(req->file) || !(req->file->f_mode & FMODE_BUF_RASYNC)) | |
3411 | return false; | |
f67676d1 | 3412 | |
3b2a4439 JA |
3413 | wait->wait.func = io_async_buf_func; |
3414 | wait->wait.private = req; | |
3415 | wait->wait.flags = 0; | |
3416 | INIT_LIST_HEAD(&wait->wait.entry); | |
3417 | kiocb->ki_flags |= IOCB_WAITQ; | |
c8d317aa | 3418 | kiocb->ki_flags &= ~IOCB_NOWAIT; |
3b2a4439 | 3419 | kiocb->ki_waitq = wait; |
3b2a4439 | 3420 | return true; |
bcf5a063 JA |
3421 | } |
3422 | ||
3423 | static int io_iter_do_read(struct io_kiocb *req, struct iov_iter *iter) | |
3424 | { | |
3425 | if (req->file->f_op->read_iter) | |
3426 | return call_read_iter(req->file, &req->rw.kiocb, iter); | |
2dd2111d | 3427 | else if (req->file->f_op->read) |
4017eb91 | 3428 | return loop_rw_iter(READ, req, iter); |
2dd2111d GH |
3429 | else |
3430 | return -EINVAL; | |
f67676d1 JA |
3431 | } |
3432 | ||
a1d7c393 JA |
3433 | static int io_read(struct io_kiocb *req, bool force_nonblock, |
3434 | struct io_comp_state *cs) | |
2b188cc1 JA |
3435 | { |
3436 | struct iovec inline_vecs[UIO_FASTIOV], *iovec = inline_vecs; | |
9adbd45d | 3437 | struct kiocb *kiocb = &req->rw.kiocb; |
ff6165b2 | 3438 | struct iov_iter __iter, *iter = &__iter; |
e8c2bc1f | 3439 | struct io_async_rw *rw = req->async_data; |
227c0c96 | 3440 | ssize_t io_size, ret, ret2; |
f5cac8b1 | 3441 | bool no_async; |
ff6165b2 | 3442 | |
2846c481 | 3443 | if (rw) { |
e8c2bc1f | 3444 | iter = &rw->iter; |
2846c481 PB |
3445 | iovec = NULL; |
3446 | } else { | |
3447 | ret = io_import_iovec(READ, req, &iovec, iter, !force_nonblock); | |
3448 | if (ret < 0) | |
3449 | return ret; | |
3450 | } | |
632546c4 | 3451 | io_size = iov_iter_count(iter); |
fa15bafb | 3452 | req->result = io_size; |
227c0c96 | 3453 | ret = 0; |
2b188cc1 | 3454 | |
fd6c2e4c JA |
3455 | /* Ensure we clear previously set non-block flag */ |
3456 | if (!force_nonblock) | |
29de5f6a | 3457 | kiocb->ki_flags &= ~IOCB_NOWAIT; |
a88fc400 PB |
3458 | else |
3459 | kiocb->ki_flags |= IOCB_NOWAIT; | |
3460 | ||
fd6c2e4c | 3461 | |
24c74678 | 3462 | /* If the file doesn't support async, just async punt */ |
f5cac8b1 JA |
3463 | no_async = force_nonblock && !io_file_supports_async(req->file, READ); |
3464 | if (no_async) | |
f67676d1 | 3465 | goto copy_iov; |
9e645e11 | 3466 | |
632546c4 | 3467 | ret = rw_verify_area(READ, req->file, io_kiocb_ppos(kiocb), io_size); |
fa15bafb PB |
3468 | if (unlikely(ret)) |
3469 | goto out_free; | |
2b188cc1 | 3470 | |
227c0c96 | 3471 | ret = io_iter_do_read(req, iter); |
32960613 | 3472 | |
227c0c96 JA |
3473 | if (!ret) { |
3474 | goto done; | |
3475 | } else if (ret == -EIOCBQUEUED) { | |
3476 | ret = 0; | |
3477 | goto out_free; | |
3478 | } else if (ret == -EAGAIN) { | |
eefdf30f JA |
3479 | /* IOPOLL retry should happen for io-wq threads */ |
3480 | if (!force_nonblock && !(req->ctx->flags & IORING_SETUP_IOPOLL)) | |
f91daf56 | 3481 | goto done; |
355afaeb JA |
3482 | /* no retry on NONBLOCK marked file */ |
3483 | if (req->file->f_flags & O_NONBLOCK) | |
3484 | goto done; | |
84216315 | 3485 | /* some cases will consume bytes even on error returns */ |
632546c4 | 3486 | iov_iter_revert(iter, io_size - iov_iter_count(iter)); |
f38c7e3a JA |
3487 | ret = 0; |
3488 | goto copy_iov; | |
227c0c96 | 3489 | } else if (ret < 0) { |
00d23d51 JA |
3490 | /* make sure -ERESTARTSYS -> -EINTR is done */ |
3491 | goto done; | |
227c0c96 JA |
3492 | } |
3493 | ||
3494 | /* read it all, or we did blocking attempt. no retry. */ | |
f91daf56 JA |
3495 | if (!iov_iter_count(iter) || !force_nonblock || |
3496 | (req->file->f_flags & O_NONBLOCK)) | |
227c0c96 JA |
3497 | goto done; |
3498 | ||
3499 | io_size -= ret; | |
3500 | copy_iov: | |
3501 | ret2 = io_setup_async_rw(req, iovec, inline_vecs, iter, true); | |
3502 | if (ret2) { | |
3503 | ret = ret2; | |
3504 | goto out_free; | |
3505 | } | |
f5cac8b1 JA |
3506 | if (no_async) |
3507 | return -EAGAIN; | |
e8c2bc1f | 3508 | rw = req->async_data; |
227c0c96 JA |
3509 | /* it's copied and will be cleaned with ->io */ |
3510 | iovec = NULL; | |
3511 | /* now use our persistent iterator, if we aren't already */ | |
e8c2bc1f | 3512 | iter = &rw->iter; |
227c0c96 | 3513 | retry: |
e8c2bc1f | 3514 | rw->bytes_done += ret; |
227c0c96 JA |
3515 | /* if we can retry, do so with the callbacks armed */ |
3516 | if (!io_rw_should_retry(req)) { | |
fa15bafb PB |
3517 | kiocb->ki_flags &= ~IOCB_WAITQ; |
3518 | return -EAGAIN; | |
2b188cc1 | 3519 | } |
227c0c96 JA |
3520 | |
3521 | /* | |
3522 | * Now retry read with the IOCB_WAITQ parts set in the iocb. If we | |
3523 | * get -EIOCBQUEUED, then we'll get a notification when the desired | |
3524 | * page gets unlocked. We can also get a partial read here, and if we | |
3525 | * do, then just retry at the new offset. | |
3526 | */ | |
3527 | ret = io_iter_do_read(req, iter); | |
3528 | if (ret == -EIOCBQUEUED) { | |
3529 | ret = 0; | |
3530 | goto out_free; | |
3531 | } else if (ret > 0 && ret < io_size) { | |
3532 | /* we got some bytes, but not all. retry. */ | |
3533 | goto retry; | |
3534 | } | |
3535 | done: | |
3536 | kiocb_done(kiocb, ret, cs); | |
3537 | ret = 0; | |
f67676d1 | 3538 | out_free: |
f261c168 | 3539 | /* it's reportedly faster than delegating the null check to kfree() */ |
252917c3 | 3540 | if (iovec) |
6f2cc166 | 3541 | kfree(iovec); |
2b188cc1 JA |
3542 | return ret; |
3543 | } | |
3544 | ||
73debe68 | 3545 | static int io_write_prep(struct io_kiocb *req, const struct io_uring_sqe *sqe) |
f67676d1 JA |
3546 | { |
3547 | ssize_t ret; | |
3548 | ||
a88fc400 | 3549 | ret = io_prep_rw(req, sqe); |
3529d8c2 JA |
3550 | if (ret) |
3551 | return ret; | |
f67676d1 | 3552 | |
3529d8c2 JA |
3553 | if (unlikely(!(req->file->f_mode & FMODE_WRITE))) |
3554 | return -EBADF; | |
f67676d1 | 3555 | |
5f798bea | 3556 | /* either don't need iovec imported or already have it */ |
2d199895 | 3557 | if (!req->async_data) |
3529d8c2 | 3558 | return 0; |
73debe68 | 3559 | return io_rw_prep_async(req, WRITE); |
f67676d1 JA |
3560 | } |
3561 | ||
a1d7c393 JA |
3562 | static int io_write(struct io_kiocb *req, bool force_nonblock, |
3563 | struct io_comp_state *cs) | |
2b188cc1 JA |
3564 | { |
3565 | struct iovec inline_vecs[UIO_FASTIOV], *iovec = inline_vecs; | |
9adbd45d | 3566 | struct kiocb *kiocb = &req->rw.kiocb; |
ff6165b2 | 3567 | struct iov_iter __iter, *iter = &__iter; |
e8c2bc1f | 3568 | struct io_async_rw *rw = req->async_data; |
fa15bafb | 3569 | ssize_t ret, ret2, io_size; |
2b188cc1 | 3570 | |
2846c481 | 3571 | if (rw) { |
e8c2bc1f | 3572 | iter = &rw->iter; |
2846c481 PB |
3573 | iovec = NULL; |
3574 | } else { | |
3575 | ret = io_import_iovec(WRITE, req, &iovec, iter, !force_nonblock); | |
3576 | if (ret < 0) | |
3577 | return ret; | |
3578 | } | |
632546c4 | 3579 | io_size = iov_iter_count(iter); |
fa15bafb | 3580 | req->result = io_size; |
2b188cc1 | 3581 | |
fd6c2e4c JA |
3582 | /* Ensure we clear previously set non-block flag */ |
3583 | if (!force_nonblock) | |
a88fc400 PB |
3584 | kiocb->ki_flags &= ~IOCB_NOWAIT; |
3585 | else | |
3586 | kiocb->ki_flags |= IOCB_NOWAIT; | |
fd6c2e4c | 3587 | |
24c74678 | 3588 | /* If the file doesn't support async, just async punt */ |
af197f50 | 3589 | if (force_nonblock && !io_file_supports_async(req->file, WRITE)) |
f67676d1 | 3590 | goto copy_iov; |
31b51510 | 3591 | |
10d59345 JA |
3592 | /* file path doesn't support NOWAIT for non-direct_IO */ |
3593 | if (force_nonblock && !(kiocb->ki_flags & IOCB_DIRECT) && | |
3594 | (req->flags & REQ_F_ISREG)) | |
f67676d1 | 3595 | goto copy_iov; |
31b51510 | 3596 | |
632546c4 | 3597 | ret = rw_verify_area(WRITE, req->file, io_kiocb_ppos(kiocb), io_size); |
fa15bafb PB |
3598 | if (unlikely(ret)) |
3599 | goto out_free; | |
4ed734b0 | 3600 | |
fa15bafb PB |
3601 | /* |
3602 | * Open-code file_start_write here to grab freeze protection, | |
3603 | * which will be released by another thread in | |
3604 | * io_complete_rw(). Fool lockdep by telling it the lock got | |
3605 | * released so that it doesn't complain about the held lock when | |
3606 | * we return to userspace. | |
3607 | */ | |
3608 | if (req->flags & REQ_F_ISREG) { | |
8a3c84b6 | 3609 | sb_start_write(file_inode(req->file)->i_sb); |
fa15bafb PB |
3610 | __sb_writers_release(file_inode(req->file)->i_sb, |
3611 | SB_FREEZE_WRITE); | |
3612 | } | |
3613 | kiocb->ki_flags |= IOCB_WRITE; | |
4ed734b0 | 3614 | |
fa15bafb | 3615 | if (req->file->f_op->write_iter) |
ff6165b2 | 3616 | ret2 = call_write_iter(req->file, kiocb, iter); |
2dd2111d | 3617 | else if (req->file->f_op->write) |
4017eb91 | 3618 | ret2 = loop_rw_iter(WRITE, req, iter); |
2dd2111d GH |
3619 | else |
3620 | ret2 = -EINVAL; | |
4ed734b0 | 3621 | |
fa15bafb PB |
3622 | /* |
3623 | * Raw bdev writes will return -EOPNOTSUPP for IOCB_NOWAIT. Just | |
3624 | * retry them without IOCB_NOWAIT. | |
3625 | */ | |
3626 | if (ret2 == -EOPNOTSUPP && (kiocb->ki_flags & IOCB_NOWAIT)) | |
3627 | ret2 = -EAGAIN; | |
355afaeb JA |
3628 | /* no retry on NONBLOCK marked file */ |
3629 | if (ret2 == -EAGAIN && (req->file->f_flags & O_NONBLOCK)) | |
3630 | goto done; | |
fa15bafb | 3631 | if (!force_nonblock || ret2 != -EAGAIN) { |
eefdf30f JA |
3632 | /* IOPOLL retry should happen for io-wq threads */ |
3633 | if ((req->ctx->flags & IORING_SETUP_IOPOLL) && ret2 == -EAGAIN) | |
3634 | goto copy_iov; | |
355afaeb | 3635 | done: |
fa15bafb PB |
3636 | kiocb_done(kiocb, ret2, cs); |
3637 | } else { | |
f67676d1 | 3638 | copy_iov: |
84216315 | 3639 | /* some cases will consume bytes even on error returns */ |
632546c4 | 3640 | iov_iter_revert(iter, io_size - iov_iter_count(iter)); |
227c0c96 | 3641 | ret = io_setup_async_rw(req, iovec, inline_vecs, iter, false); |
ff6165b2 JA |
3642 | if (!ret) |
3643 | return -EAGAIN; | |
2b188cc1 | 3644 | } |
31b51510 | 3645 | out_free: |
f261c168 | 3646 | /* it's reportedly faster than delegating the null check to kfree() */ |
252917c3 | 3647 | if (iovec) |
6f2cc166 | 3648 | kfree(iovec); |
2b188cc1 JA |
3649 | return ret; |
3650 | } | |
3651 | ||
80a261fd JA |
3652 | static int io_renameat_prep(struct io_kiocb *req, |
3653 | const struct io_uring_sqe *sqe) | |
3654 | { | |
3655 | struct io_rename *ren = &req->rename; | |
3656 | const char __user *oldf, *newf; | |
3657 | ||
3658 | if (unlikely(req->flags & REQ_F_FIXED_FILE)) | |
3659 | return -EBADF; | |
3660 | ||
3661 | ren->old_dfd = READ_ONCE(sqe->fd); | |
3662 | oldf = u64_to_user_ptr(READ_ONCE(sqe->addr)); | |
3663 | newf = u64_to_user_ptr(READ_ONCE(sqe->addr2)); | |
3664 | ren->new_dfd = READ_ONCE(sqe->len); | |
3665 | ren->flags = READ_ONCE(sqe->rename_flags); | |
3666 | ||
3667 | ren->oldpath = getname(oldf); | |
3668 | if (IS_ERR(ren->oldpath)) | |
3669 | return PTR_ERR(ren->oldpath); | |
3670 | ||
3671 | ren->newpath = getname(newf); | |
3672 | if (IS_ERR(ren->newpath)) { | |
3673 | putname(ren->oldpath); | |
3674 | return PTR_ERR(ren->newpath); | |
3675 | } | |
3676 | ||
3677 | req->flags |= REQ_F_NEED_CLEANUP; | |
3678 | return 0; | |
3679 | } | |
3680 | ||
3681 | static int io_renameat(struct io_kiocb *req, bool force_nonblock) | |
3682 | { | |
3683 | struct io_rename *ren = &req->rename; | |
3684 | int ret; | |
3685 | ||
3686 | if (force_nonblock) | |
3687 | return -EAGAIN; | |
3688 | ||
3689 | ret = do_renameat2(ren->old_dfd, ren->oldpath, ren->new_dfd, | |
3690 | ren->newpath, ren->flags); | |
3691 | ||
3692 | req->flags &= ~REQ_F_NEED_CLEANUP; | |
3693 | if (ret < 0) | |
3694 | req_set_fail_links(req); | |
3695 | io_req_complete(req, ret); | |
3696 | return 0; | |
3697 | } | |
3698 | ||
14a1143b JA |
3699 | static int io_unlinkat_prep(struct io_kiocb *req, |
3700 | const struct io_uring_sqe *sqe) | |
3701 | { | |
3702 | struct io_unlink *un = &req->unlink; | |
3703 | const char __user *fname; | |
3704 | ||
3705 | if (unlikely(req->flags & REQ_F_FIXED_FILE)) | |
3706 | return -EBADF; | |
3707 | ||
3708 | un->dfd = READ_ONCE(sqe->fd); | |
3709 | ||
3710 | un->flags = READ_ONCE(sqe->unlink_flags); | |
3711 | if (un->flags & ~AT_REMOVEDIR) | |
3712 | return -EINVAL; | |
3713 | ||
3714 | fname = u64_to_user_ptr(READ_ONCE(sqe->addr)); | |
3715 | un->filename = getname(fname); | |
3716 | if (IS_ERR(un->filename)) | |
3717 | return PTR_ERR(un->filename); | |
3718 | ||
3719 | req->flags |= REQ_F_NEED_CLEANUP; | |
3720 | return 0; | |
3721 | } | |
3722 | ||
3723 | static int io_unlinkat(struct io_kiocb *req, bool force_nonblock) | |
3724 | { | |
3725 | struct io_unlink *un = &req->unlink; | |
3726 | int ret; | |
3727 | ||
3728 | if (force_nonblock) | |
3729 | return -EAGAIN; | |
3730 | ||
3731 | if (un->flags & AT_REMOVEDIR) | |
3732 | ret = do_rmdir(un->dfd, un->filename); | |
3733 | else | |
3734 | ret = do_unlinkat(un->dfd, un->filename); | |
3735 | ||
3736 | req->flags &= ~REQ_F_NEED_CLEANUP; | |
3737 | if (ret < 0) | |
3738 | req_set_fail_links(req); | |
3739 | io_req_complete(req, ret); | |
3740 | return 0; | |
3741 | } | |
3742 | ||
36f4fa68 JA |
3743 | static int io_shutdown_prep(struct io_kiocb *req, |
3744 | const struct io_uring_sqe *sqe) | |
3745 | { | |
3746 | #if defined(CONFIG_NET) | |
3747 | if (unlikely(req->ctx->flags & IORING_SETUP_IOPOLL)) | |
3748 | return -EINVAL; | |
3749 | if (sqe->ioprio || sqe->off || sqe->addr || sqe->rw_flags || | |
3750 | sqe->buf_index) | |
3751 | return -EINVAL; | |
3752 | ||
3753 | req->shutdown.how = READ_ONCE(sqe->len); | |
3754 | return 0; | |
3755 | #else | |
3756 | return -EOPNOTSUPP; | |
3757 | #endif | |
3758 | } | |
3759 | ||
3760 | static int io_shutdown(struct io_kiocb *req, bool force_nonblock) | |
3761 | { | |
3762 | #if defined(CONFIG_NET) | |
3763 | struct socket *sock; | |
3764 | int ret; | |
3765 | ||
3766 | if (force_nonblock) | |
3767 | return -EAGAIN; | |
3768 | ||
3769 | sock = sock_from_file(req->file, &ret); | |
3770 | if (unlikely(!sock)) | |
3771 | return ret; | |
3772 | ||
3773 | ret = __sys_shutdown_sock(sock, req->shutdown.how); | |
3774 | io_req_complete(req, ret); | |
3775 | return 0; | |
3776 | #else | |
3777 | return -EOPNOTSUPP; | |
3778 | #endif | |
3779 | } | |
3780 | ||
f2a8d5c7 PB |
3781 | static int __io_splice_prep(struct io_kiocb *req, |
3782 | const struct io_uring_sqe *sqe) | |
7d67af2c PB |
3783 | { |
3784 | struct io_splice* sp = &req->splice; | |
3785 | unsigned int valid_flags = SPLICE_F_FD_IN_FIXED | SPLICE_F_ALL; | |
7d67af2c | 3786 | |
3232dd02 PB |
3787 | if (unlikely(req->ctx->flags & IORING_SETUP_IOPOLL)) |
3788 | return -EINVAL; | |
7d67af2c PB |
3789 | |
3790 | sp->file_in = NULL; | |
7d67af2c PB |
3791 | sp->len = READ_ONCE(sqe->len); |
3792 | sp->flags = READ_ONCE(sqe->splice_flags); | |
3793 | ||
3794 | if (unlikely(sp->flags & ~valid_flags)) | |
3795 | return -EINVAL; | |
3796 | ||
8371adf5 PB |
3797 | sp->file_in = io_file_get(NULL, req, READ_ONCE(sqe->splice_fd_in), |
3798 | (sp->flags & SPLICE_F_FD_IN_FIXED)); | |
3799 | if (!sp->file_in) | |
3800 | return -EBADF; | |
7d67af2c PB |
3801 | req->flags |= REQ_F_NEED_CLEANUP; |
3802 | ||
7cdaf587 XW |
3803 | if (!S_ISREG(file_inode(sp->file_in)->i_mode)) { |
3804 | /* | |
3805 | * Splice operation will be punted aync, and here need to | |
3806 | * modify io_wq_work.flags, so initialize io_wq_work firstly. | |
3807 | */ | |
3808 | io_req_init_async(req); | |
7d67af2c | 3809 | req->work.flags |= IO_WQ_WORK_UNBOUND; |
7cdaf587 | 3810 | } |
7d67af2c PB |
3811 | |
3812 | return 0; | |
3813 | } | |
3814 | ||
f2a8d5c7 PB |
3815 | static int io_tee_prep(struct io_kiocb *req, |
3816 | const struct io_uring_sqe *sqe) | |
3817 | { | |
3818 | if (READ_ONCE(sqe->splice_off_in) || READ_ONCE(sqe->off)) | |
3819 | return -EINVAL; | |
3820 | return __io_splice_prep(req, sqe); | |
3821 | } | |
3822 | ||
3823 | static int io_tee(struct io_kiocb *req, bool force_nonblock) | |
3824 | { | |
3825 | struct io_splice *sp = &req->splice; | |
3826 | struct file *in = sp->file_in; | |
3827 | struct file *out = sp->file_out; | |
3828 | unsigned int flags = sp->flags & ~SPLICE_F_FD_IN_FIXED; | |
3829 | long ret = 0; | |
3830 | ||
3831 | if (force_nonblock) | |
3832 | return -EAGAIN; | |
3833 | if (sp->len) | |
3834 | ret = do_tee(in, out, sp->len, flags); | |
3835 | ||
3836 | io_put_file(req, in, (sp->flags & SPLICE_F_FD_IN_FIXED)); | |
3837 | req->flags &= ~REQ_F_NEED_CLEANUP; | |
3838 | ||
f2a8d5c7 PB |
3839 | if (ret != sp->len) |
3840 | req_set_fail_links(req); | |
e1e16097 | 3841 | io_req_complete(req, ret); |
f2a8d5c7 PB |
3842 | return 0; |
3843 | } | |
3844 | ||
3845 | static int io_splice_prep(struct io_kiocb *req, const struct io_uring_sqe *sqe) | |
3846 | { | |
3847 | struct io_splice* sp = &req->splice; | |
3848 | ||
3849 | sp->off_in = READ_ONCE(sqe->splice_off_in); | |
3850 | sp->off_out = READ_ONCE(sqe->off); | |
3851 | return __io_splice_prep(req, sqe); | |
3852 | } | |
3853 | ||
014db007 | 3854 | static int io_splice(struct io_kiocb *req, bool force_nonblock) |
7d67af2c PB |
3855 | { |
3856 | struct io_splice *sp = &req->splice; | |
3857 | struct file *in = sp->file_in; | |
3858 | struct file *out = sp->file_out; | |
3859 | unsigned int flags = sp->flags & ~SPLICE_F_FD_IN_FIXED; | |
3860 | loff_t *poff_in, *poff_out; | |
c9687426 | 3861 | long ret = 0; |
7d67af2c | 3862 | |
2fb3e822 PB |
3863 | if (force_nonblock) |
3864 | return -EAGAIN; | |
7d67af2c PB |
3865 | |
3866 | poff_in = (sp->off_in == -1) ? NULL : &sp->off_in; | |
3867 | poff_out = (sp->off_out == -1) ? NULL : &sp->off_out; | |
c9687426 | 3868 | |
948a7749 | 3869 | if (sp->len) |
c9687426 | 3870 | ret = do_splice(in, poff_in, out, poff_out, sp->len, flags); |
7d67af2c PB |
3871 | |
3872 | io_put_file(req, in, (sp->flags & SPLICE_F_FD_IN_FIXED)); | |
3873 | req->flags &= ~REQ_F_NEED_CLEANUP; | |
3874 | ||
7d67af2c PB |
3875 | if (ret != sp->len) |
3876 | req_set_fail_links(req); | |
e1e16097 | 3877 | io_req_complete(req, ret); |
7d67af2c PB |
3878 | return 0; |
3879 | } | |
3880 | ||
2b188cc1 JA |
3881 | /* |
3882 | * IORING_OP_NOP just posts a completion event, nothing else. | |
3883 | */ | |
229a7b63 | 3884 | static int io_nop(struct io_kiocb *req, struct io_comp_state *cs) |
2b188cc1 JA |
3885 | { |
3886 | struct io_ring_ctx *ctx = req->ctx; | |
2b188cc1 | 3887 | |
def596e9 JA |
3888 | if (unlikely(ctx->flags & IORING_SETUP_IOPOLL)) |
3889 | return -EINVAL; | |
3890 | ||
229a7b63 | 3891 | __io_req_complete(req, 0, 0, cs); |
2b188cc1 JA |
3892 | return 0; |
3893 | } | |
3894 | ||
3529d8c2 | 3895 | static int io_prep_fsync(struct io_kiocb *req, const struct io_uring_sqe *sqe) |
c992fe29 | 3896 | { |
6b06314c | 3897 | struct io_ring_ctx *ctx = req->ctx; |
c992fe29 | 3898 | |
09bb8394 JA |
3899 | if (!req->file) |
3900 | return -EBADF; | |
c992fe29 | 3901 | |
6b06314c | 3902 | if (unlikely(ctx->flags & IORING_SETUP_IOPOLL)) |
def596e9 | 3903 | return -EINVAL; |
edafccee | 3904 | if (unlikely(sqe->addr || sqe->ioprio || sqe->buf_index)) |
c992fe29 CH |
3905 | return -EINVAL; |
3906 | ||
8ed8d3c3 JA |
3907 | req->sync.flags = READ_ONCE(sqe->fsync_flags); |
3908 | if (unlikely(req->sync.flags & ~IORING_FSYNC_DATASYNC)) | |
3909 | return -EINVAL; | |
3910 | ||
3911 | req->sync.off = READ_ONCE(sqe->off); | |
3912 | req->sync.len = READ_ONCE(sqe->len); | |
c992fe29 CH |
3913 | return 0; |
3914 | } | |
3915 | ||
ac45abc0 | 3916 | static int io_fsync(struct io_kiocb *req, bool force_nonblock) |
8ed8d3c3 | 3917 | { |
8ed8d3c3 | 3918 | loff_t end = req->sync.off + req->sync.len; |
8ed8d3c3 JA |
3919 | int ret; |
3920 | ||
ac45abc0 PB |
3921 | /* fsync always requires a blocking context */ |
3922 | if (force_nonblock) | |
3923 | return -EAGAIN; | |
3924 | ||
9adbd45d | 3925 | ret = vfs_fsync_range(req->file, req->sync.off, |
8ed8d3c3 JA |
3926 | end > 0 ? end : LLONG_MAX, |
3927 | req->sync.flags & IORING_FSYNC_DATASYNC); | |
3928 | if (ret < 0) | |
3929 | req_set_fail_links(req); | |
e1e16097 | 3930 | io_req_complete(req, ret); |
c992fe29 CH |
3931 | return 0; |
3932 | } | |
3933 | ||
d63d1b5e JA |
3934 | static int io_fallocate_prep(struct io_kiocb *req, |
3935 | const struct io_uring_sqe *sqe) | |
3936 | { | |
3937 | if (sqe->ioprio || sqe->buf_index || sqe->rw_flags) | |
3938 | return -EINVAL; | |
3232dd02 PB |
3939 | if (unlikely(req->ctx->flags & IORING_SETUP_IOPOLL)) |
3940 | return -EINVAL; | |
d63d1b5e JA |
3941 | |
3942 | req->sync.off = READ_ONCE(sqe->off); | |
3943 | req->sync.len = READ_ONCE(sqe->addr); | |
3944 | req->sync.mode = READ_ONCE(sqe->len); | |
3945 | return 0; | |
3946 | } | |
3947 | ||
014db007 | 3948 | static int io_fallocate(struct io_kiocb *req, bool force_nonblock) |
5d17b4a4 | 3949 | { |
ac45abc0 PB |
3950 | int ret; |
3951 | ||
d63d1b5e | 3952 | /* fallocate always requiring blocking context */ |
ac45abc0 | 3953 | if (force_nonblock) |
5d17b4a4 | 3954 | return -EAGAIN; |
ac45abc0 PB |
3955 | ret = vfs_fallocate(req->file, req->sync.mode, req->sync.off, |
3956 | req->sync.len); | |
ac45abc0 PB |
3957 | if (ret < 0) |
3958 | req_set_fail_links(req); | |
e1e16097 | 3959 | io_req_complete(req, ret); |
5d17b4a4 JA |
3960 | return 0; |
3961 | } | |
3962 | ||
ec65fea5 | 3963 | static int __io_openat_prep(struct io_kiocb *req, const struct io_uring_sqe *sqe) |
b7bb4f7d | 3964 | { |
f8748881 | 3965 | const char __user *fname; |
15b71abe | 3966 | int ret; |
b7bb4f7d | 3967 | |
ec65fea5 | 3968 | if (unlikely(sqe->ioprio || sqe->buf_index)) |
15b71abe | 3969 | return -EINVAL; |
ec65fea5 | 3970 | if (unlikely(req->flags & REQ_F_FIXED_FILE)) |
cf3040ca | 3971 | return -EBADF; |
03b1230c | 3972 | |
ec65fea5 PB |
3973 | /* open.how should be already initialised */ |
3974 | if (!(req->open.how.flags & O_PATH) && force_o_largefile()) | |
08a1d26e | 3975 | req->open.how.flags |= O_LARGEFILE; |
3529d8c2 | 3976 | |
25e72d10 PB |
3977 | req->open.dfd = READ_ONCE(sqe->fd); |
3978 | fname = u64_to_user_ptr(READ_ONCE(sqe->addr)); | |
f8748881 | 3979 | req->open.filename = getname(fname); |
15b71abe JA |
3980 | if (IS_ERR(req->open.filename)) { |
3981 | ret = PTR_ERR(req->open.filename); | |
3982 | req->open.filename = NULL; | |
3983 | return ret; | |
3984 | } | |
4022e7af | 3985 | req->open.nofile = rlimit(RLIMIT_NOFILE); |
944d1444 | 3986 | req->open.ignore_nonblock = false; |
8fef80bf | 3987 | req->flags |= REQ_F_NEED_CLEANUP; |
15b71abe | 3988 | return 0; |
03b1230c JA |
3989 | } |
3990 | ||
ec65fea5 PB |
3991 | static int io_openat_prep(struct io_kiocb *req, const struct io_uring_sqe *sqe) |
3992 | { | |
3993 | u64 flags, mode; | |
3994 | ||
14587a46 | 3995 | if (unlikely(req->ctx->flags & IORING_SETUP_IOPOLL)) |
4eb8dded | 3996 | return -EINVAL; |
ec65fea5 PB |
3997 | mode = READ_ONCE(sqe->len); |
3998 | flags = READ_ONCE(sqe->open_flags); | |
3999 | req->open.how = build_open_how(flags, mode); | |
4000 | return __io_openat_prep(req, sqe); | |
4001 | } | |
4002 | ||
cebdb986 | 4003 | static int io_openat2_prep(struct io_kiocb *req, const struct io_uring_sqe *sqe) |
aa1fa28f | 4004 | { |
cebdb986 | 4005 | struct open_how __user *how; |
cebdb986 | 4006 | size_t len; |
0fa03c62 JA |
4007 | int ret; |
4008 | ||
14587a46 | 4009 | if (unlikely(req->ctx->flags & IORING_SETUP_IOPOLL)) |
4eb8dded | 4010 | return -EINVAL; |
cebdb986 JA |
4011 | how = u64_to_user_ptr(READ_ONCE(sqe->addr2)); |
4012 | len = READ_ONCE(sqe->len); | |
cebdb986 JA |
4013 | if (len < OPEN_HOW_SIZE_VER0) |
4014 | return -EINVAL; | |
3529d8c2 | 4015 | |
cebdb986 JA |
4016 | ret = copy_struct_from_user(&req->open.how, sizeof(req->open.how), how, |
4017 | len); | |
4018 | if (ret) | |
4019 | return ret; | |
3529d8c2 | 4020 | |
ec65fea5 | 4021 | return __io_openat_prep(req, sqe); |
cebdb986 JA |
4022 | } |
4023 | ||
014db007 | 4024 | static int io_openat2(struct io_kiocb *req, bool force_nonblock) |
15b71abe JA |
4025 | { |
4026 | struct open_flags op; | |
15b71abe JA |
4027 | struct file *file; |
4028 | int ret; | |
4029 | ||
944d1444 | 4030 | if (force_nonblock && !req->open.ignore_nonblock) |
15b71abe | 4031 | return -EAGAIN; |
15b71abe | 4032 | |
cebdb986 | 4033 | ret = build_open_flags(&req->open.how, &op); |
15b71abe JA |
4034 | if (ret) |
4035 | goto err; | |
4036 | ||
4022e7af | 4037 | ret = __get_unused_fd_flags(req->open.how.flags, req->open.nofile); |
15b71abe JA |
4038 | if (ret < 0) |
4039 | goto err; | |
4040 | ||
4041 | file = do_filp_open(req->open.dfd, req->open.filename, &op); | |
4042 | if (IS_ERR(file)) { | |
4043 | put_unused_fd(ret); | |
4044 | ret = PTR_ERR(file); | |
944d1444 JA |
4045 | /* |
4046 | * A work-around to ensure that /proc/self works that way | |
4047 | * that it should - if we get -EOPNOTSUPP back, then assume | |
4048 | * that proc_self_get_link() failed us because we're in async | |
4049 | * context. We should be safe to retry this from the task | |
4050 | * itself with force_nonblock == false set, as it should not | |
4051 | * block on lookup. Would be nice to know this upfront and | |
4052 | * avoid the async dance, but doesn't seem feasible. | |
4053 | */ | |
4054 | if (ret == -EOPNOTSUPP && io_wq_current_is_worker()) { | |
4055 | req->open.ignore_nonblock = true; | |
4056 | refcount_inc(&req->refs); | |
4057 | io_req_task_queue(req); | |
4058 | return 0; | |
4059 | } | |
15b71abe JA |
4060 | } else { |
4061 | fsnotify_open(file); | |
4062 | fd_install(ret, file); | |
4063 | } | |
4064 | err: | |
4065 | putname(req->open.filename); | |
8fef80bf | 4066 | req->flags &= ~REQ_F_NEED_CLEANUP; |
15b71abe JA |
4067 | if (ret < 0) |
4068 | req_set_fail_links(req); | |
e1e16097 | 4069 | io_req_complete(req, ret); |
15b71abe JA |
4070 | return 0; |
4071 | } | |
4072 | ||
014db007 | 4073 | static int io_openat(struct io_kiocb *req, bool force_nonblock) |
cebdb986 | 4074 | { |
014db007 | 4075 | return io_openat2(req, force_nonblock); |
cebdb986 JA |
4076 | } |
4077 | ||
067524e9 JA |
4078 | static int io_remove_buffers_prep(struct io_kiocb *req, |
4079 | const struct io_uring_sqe *sqe) | |
4080 | { | |
4081 | struct io_provide_buf *p = &req->pbuf; | |
4082 | u64 tmp; | |
4083 | ||
4084 | if (sqe->ioprio || sqe->rw_flags || sqe->addr || sqe->len || sqe->off) | |
4085 | return -EINVAL; | |
4086 | ||
4087 | tmp = READ_ONCE(sqe->fd); | |
4088 | if (!tmp || tmp > USHRT_MAX) | |
4089 | return -EINVAL; | |
4090 | ||
4091 | memset(p, 0, sizeof(*p)); | |
4092 | p->nbufs = tmp; | |
4093 | p->bgid = READ_ONCE(sqe->buf_group); | |
4094 | return 0; | |
4095 | } | |
4096 | ||
4097 | static int __io_remove_buffers(struct io_ring_ctx *ctx, struct io_buffer *buf, | |
4098 | int bgid, unsigned nbufs) | |
4099 | { | |
4100 | unsigned i = 0; | |
4101 | ||
4102 | /* shouldn't happen */ | |
4103 | if (!nbufs) | |
4104 | return 0; | |
4105 | ||
4106 | /* the head kbuf is the list itself */ | |
4107 | while (!list_empty(&buf->list)) { | |
4108 | struct io_buffer *nxt; | |
4109 | ||
4110 | nxt = list_first_entry(&buf->list, struct io_buffer, list); | |
4111 | list_del(&nxt->list); | |
4112 | kfree(nxt); | |
4113 | if (++i == nbufs) | |
4114 | return i; | |
4115 | } | |
4116 | i++; | |
4117 | kfree(buf); | |
4118 | idr_remove(&ctx->io_buffer_idr, bgid); | |
4119 | ||
4120 | return i; | |
4121 | } | |
4122 | ||
229a7b63 JA |
4123 | static int io_remove_buffers(struct io_kiocb *req, bool force_nonblock, |
4124 | struct io_comp_state *cs) | |
067524e9 JA |
4125 | { |
4126 | struct io_provide_buf *p = &req->pbuf; | |
4127 | struct io_ring_ctx *ctx = req->ctx; | |
4128 | struct io_buffer *head; | |
4129 | int ret = 0; | |
4130 | ||
4131 | io_ring_submit_lock(ctx, !force_nonblock); | |
4132 | ||
4133 | lockdep_assert_held(&ctx->uring_lock); | |
4134 | ||
4135 | ret = -ENOENT; | |
4136 | head = idr_find(&ctx->io_buffer_idr, p->bgid); | |
4137 | if (head) | |
4138 | ret = __io_remove_buffers(ctx, head, p->bgid, p->nbufs); | |
4139 | ||
4140 | io_ring_submit_lock(ctx, !force_nonblock); | |
4141 | if (ret < 0) | |
4142 | req_set_fail_links(req); | |
229a7b63 | 4143 | __io_req_complete(req, ret, 0, cs); |
067524e9 JA |
4144 | return 0; |
4145 | } | |
4146 | ||
ddf0322d JA |
4147 | static int io_provide_buffers_prep(struct io_kiocb *req, |
4148 | const struct io_uring_sqe *sqe) | |
4149 | { | |
4150 | struct io_provide_buf *p = &req->pbuf; | |
4151 | u64 tmp; | |
4152 | ||
4153 | if (sqe->ioprio || sqe->rw_flags) | |
4154 | return -EINVAL; | |
4155 | ||
4156 | tmp = READ_ONCE(sqe->fd); | |
4157 | if (!tmp || tmp > USHRT_MAX) | |
4158 | return -E2BIG; | |
4159 | p->nbufs = tmp; | |
4160 | p->addr = READ_ONCE(sqe->addr); | |
4161 | p->len = READ_ONCE(sqe->len); | |
4162 | ||
efe68c1c | 4163 | if (!access_ok(u64_to_user_ptr(p->addr), (p->len * p->nbufs))) |
ddf0322d JA |
4164 | return -EFAULT; |
4165 | ||
4166 | p->bgid = READ_ONCE(sqe->buf_group); | |
4167 | tmp = READ_ONCE(sqe->off); | |
4168 | if (tmp > USHRT_MAX) | |
4169 | return -E2BIG; | |
4170 | p->bid = tmp; | |
4171 | return 0; | |
4172 | } | |
4173 | ||
4174 | static int io_add_buffers(struct io_provide_buf *pbuf, struct io_buffer **head) | |
4175 | { | |
4176 | struct io_buffer *buf; | |
4177 | u64 addr = pbuf->addr; | |
4178 | int i, bid = pbuf->bid; | |
4179 | ||
4180 | for (i = 0; i < pbuf->nbufs; i++) { | |
4181 | buf = kmalloc(sizeof(*buf), GFP_KERNEL); | |
4182 | if (!buf) | |
4183 | break; | |
4184 | ||
4185 | buf->addr = addr; | |
4186 | buf->len = pbuf->len; | |
4187 | buf->bid = bid; | |
4188 | addr += pbuf->len; | |
4189 | bid++; | |
4190 | if (!*head) { | |
4191 | INIT_LIST_HEAD(&buf->list); | |
4192 | *head = buf; | |
4193 | } else { | |
4194 | list_add_tail(&buf->list, &(*head)->list); | |
4195 | } | |
4196 | } | |
4197 | ||
4198 | return i ? i : -ENOMEM; | |
4199 | } | |
4200 | ||
229a7b63 JA |
4201 | static int io_provide_buffers(struct io_kiocb *req, bool force_nonblock, |
4202 | struct io_comp_state *cs) | |
ddf0322d JA |
4203 | { |
4204 | struct io_provide_buf *p = &req->pbuf; | |
4205 | struct io_ring_ctx *ctx = req->ctx; | |
4206 | struct io_buffer *head, *list; | |
4207 | int ret = 0; | |
4208 | ||
4209 | io_ring_submit_lock(ctx, !force_nonblock); | |
4210 | ||
4211 | lockdep_assert_held(&ctx->uring_lock); | |
4212 | ||
4213 | list = head = idr_find(&ctx->io_buffer_idr, p->bgid); | |
4214 | ||
4215 | ret = io_add_buffers(p, &head); | |
4216 | if (ret < 0) | |
4217 | goto out; | |
4218 | ||
4219 | if (!list) { | |
4220 | ret = idr_alloc(&ctx->io_buffer_idr, head, p->bgid, p->bgid + 1, | |
4221 | GFP_KERNEL); | |
4222 | if (ret < 0) { | |
067524e9 | 4223 | __io_remove_buffers(ctx, head, p->bgid, -1U); |
ddf0322d JA |
4224 | goto out; |
4225 | } | |
4226 | } | |
4227 | out: | |
4228 | io_ring_submit_unlock(ctx, !force_nonblock); | |
4229 | if (ret < 0) | |
4230 | req_set_fail_links(req); | |
229a7b63 | 4231 | __io_req_complete(req, ret, 0, cs); |
ddf0322d | 4232 | return 0; |
cebdb986 JA |
4233 | } |
4234 | ||
3e4827b0 JA |
4235 | static int io_epoll_ctl_prep(struct io_kiocb *req, |
4236 | const struct io_uring_sqe *sqe) | |
4237 | { | |
4238 | #if defined(CONFIG_EPOLL) | |
4239 | if (sqe->ioprio || sqe->buf_index) | |
4240 | return -EINVAL; | |
6ca56f84 | 4241 | if (unlikely(req->ctx->flags & (IORING_SETUP_IOPOLL | IORING_SETUP_SQPOLL))) |
3232dd02 | 4242 | return -EINVAL; |
3e4827b0 JA |
4243 | |
4244 | req->epoll.epfd = READ_ONCE(sqe->fd); | |
4245 | req->epoll.op = READ_ONCE(sqe->len); | |
4246 | req->epoll.fd = READ_ONCE(sqe->off); | |
4247 | ||
4248 | if (ep_op_has_event(req->epoll.op)) { | |
4249 | struct epoll_event __user *ev; | |
4250 | ||
4251 | ev = u64_to_user_ptr(READ_ONCE(sqe->addr)); | |
4252 | if (copy_from_user(&req->epoll.event, ev, sizeof(*ev))) | |
4253 | return -EFAULT; | |
4254 | } | |
4255 | ||
4256 | return 0; | |
4257 | #else | |
4258 | return -EOPNOTSUPP; | |
4259 | #endif | |
4260 | } | |
4261 | ||
229a7b63 JA |
4262 | static int io_epoll_ctl(struct io_kiocb *req, bool force_nonblock, |
4263 | struct io_comp_state *cs) | |
3e4827b0 JA |
4264 | { |
4265 | #if defined(CONFIG_EPOLL) | |
4266 | struct io_epoll *ie = &req->epoll; | |
4267 | int ret; | |
4268 | ||
4269 | ret = do_epoll_ctl(ie->epfd, ie->op, ie->fd, &ie->event, force_nonblock); | |
4270 | if (force_nonblock && ret == -EAGAIN) | |
4271 | return -EAGAIN; | |
4272 | ||
4273 | if (ret < 0) | |
4274 | req_set_fail_links(req); | |
229a7b63 | 4275 | __io_req_complete(req, ret, 0, cs); |
3e4827b0 JA |
4276 | return 0; |
4277 | #else | |
4278 | return -EOPNOTSUPP; | |
4279 | #endif | |
4280 | } | |
4281 | ||
c1ca757b JA |
4282 | static int io_madvise_prep(struct io_kiocb *req, const struct io_uring_sqe *sqe) |
4283 | { | |
4284 | #if defined(CONFIG_ADVISE_SYSCALLS) && defined(CONFIG_MMU) | |
4285 | if (sqe->ioprio || sqe->buf_index || sqe->off) | |
4286 | return -EINVAL; | |
3232dd02 PB |
4287 | if (unlikely(req->ctx->flags & IORING_SETUP_IOPOLL)) |
4288 | return -EINVAL; | |
c1ca757b JA |
4289 | |
4290 | req->madvise.addr = READ_ONCE(sqe->addr); | |
4291 | req->madvise.len = READ_ONCE(sqe->len); | |
4292 | req->madvise.advice = READ_ONCE(sqe->fadvise_advice); | |
4293 | return 0; | |
4294 | #else | |
4295 | return -EOPNOTSUPP; | |
4296 | #endif | |
4297 | } | |
4298 | ||
014db007 | 4299 | static int io_madvise(struct io_kiocb *req, bool force_nonblock) |
c1ca757b JA |
4300 | { |
4301 | #if defined(CONFIG_ADVISE_SYSCALLS) && defined(CONFIG_MMU) | |
4302 | struct io_madvise *ma = &req->madvise; | |
4303 | int ret; | |
4304 | ||
4305 | if (force_nonblock) | |
4306 | return -EAGAIN; | |
4307 | ||
0726b01e | 4308 | ret = do_madvise(current->mm, ma->addr, ma->len, ma->advice); |
c1ca757b JA |
4309 | if (ret < 0) |
4310 | req_set_fail_links(req); | |
e1e16097 | 4311 | io_req_complete(req, ret); |
c1ca757b JA |
4312 | return 0; |
4313 | #else | |
4314 | return -EOPNOTSUPP; | |
4315 | #endif | |
4316 | } | |
4317 | ||
4840e418 JA |
4318 | static int io_fadvise_prep(struct io_kiocb *req, const struct io_uring_sqe *sqe) |
4319 | { | |
4320 | if (sqe->ioprio || sqe->buf_index || sqe->addr) | |
4321 | return -EINVAL; | |
3232dd02 PB |
4322 | if (unlikely(req->ctx->flags & IORING_SETUP_IOPOLL)) |
4323 | return -EINVAL; | |
4840e418 JA |
4324 | |
4325 | req->fadvise.offset = READ_ONCE(sqe->off); | |
4326 | req->fadvise.len = READ_ONCE(sqe->len); | |
4327 | req->fadvise.advice = READ_ONCE(sqe->fadvise_advice); | |
4328 | return 0; | |
4329 | } | |
4330 | ||
014db007 | 4331 | static int io_fadvise(struct io_kiocb *req, bool force_nonblock) |
4840e418 JA |
4332 | { |
4333 | struct io_fadvise *fa = &req->fadvise; | |
4334 | int ret; | |
4335 | ||
3e69426d JA |
4336 | if (force_nonblock) { |
4337 | switch (fa->advice) { | |
4338 | case POSIX_FADV_NORMAL: | |
4339 | case POSIX_FADV_RANDOM: | |
4340 | case POSIX_FADV_SEQUENTIAL: | |
4341 | break; | |
4342 | default: | |
4343 | return -EAGAIN; | |
4344 | } | |
4345 | } | |
4840e418 JA |
4346 | |
4347 | ret = vfs_fadvise(req->file, fa->offset, fa->len, fa->advice); | |
4348 | if (ret < 0) | |
4349 | req_set_fail_links(req); | |
e1e16097 | 4350 | io_req_complete(req, ret); |
4840e418 JA |
4351 | return 0; |
4352 | } | |
4353 | ||
eddc7ef5 JA |
4354 | static int io_statx_prep(struct io_kiocb *req, const struct io_uring_sqe *sqe) |
4355 | { | |
6ca56f84 | 4356 | if (unlikely(req->ctx->flags & (IORING_SETUP_IOPOLL | IORING_SETUP_SQPOLL))) |
3232dd02 | 4357 | return -EINVAL; |
eddc7ef5 JA |
4358 | if (sqe->ioprio || sqe->buf_index) |
4359 | return -EINVAL; | |
9c280f90 | 4360 | if (req->flags & REQ_F_FIXED_FILE) |
cf3040ca | 4361 | return -EBADF; |
eddc7ef5 | 4362 | |
1d9e1288 BM |
4363 | req->statx.dfd = READ_ONCE(sqe->fd); |
4364 | req->statx.mask = READ_ONCE(sqe->len); | |
e62753e4 | 4365 | req->statx.filename = u64_to_user_ptr(READ_ONCE(sqe->addr)); |
1d9e1288 BM |
4366 | req->statx.buffer = u64_to_user_ptr(READ_ONCE(sqe->addr2)); |
4367 | req->statx.flags = READ_ONCE(sqe->statx_flags); | |
eddc7ef5 JA |
4368 | |
4369 | return 0; | |
4370 | } | |
4371 | ||
014db007 | 4372 | static int io_statx(struct io_kiocb *req, bool force_nonblock) |
eddc7ef5 | 4373 | { |
1d9e1288 | 4374 | struct io_statx *ctx = &req->statx; |
eddc7ef5 JA |
4375 | int ret; |
4376 | ||
5b0bbee4 JA |
4377 | if (force_nonblock) { |
4378 | /* only need file table for an actual valid fd */ | |
4379 | if (ctx->dfd == -1 || ctx->dfd == AT_FDCWD) | |
4380 | req->flags |= REQ_F_NO_FILE_TABLE; | |
eddc7ef5 | 4381 | return -EAGAIN; |
5b0bbee4 | 4382 | } |
eddc7ef5 | 4383 | |
e62753e4 BM |
4384 | ret = do_statx(ctx->dfd, ctx->filename, ctx->flags, ctx->mask, |
4385 | ctx->buffer); | |
eddc7ef5 | 4386 | |
eddc7ef5 JA |
4387 | if (ret < 0) |
4388 | req_set_fail_links(req); | |
e1e16097 | 4389 | io_req_complete(req, ret); |
eddc7ef5 JA |
4390 | return 0; |
4391 | } | |
4392 | ||
b5dba59e JA |
4393 | static int io_close_prep(struct io_kiocb *req, const struct io_uring_sqe *sqe) |
4394 | { | |
4395 | /* | |
4396 | * If we queue this for async, it must not be cancellable. That would | |
7cdaf587 XW |
4397 | * leave the 'file' in an undeterminate state, and here need to modify |
4398 | * io_wq_work.flags, so initialize io_wq_work firstly. | |
b5dba59e | 4399 | */ |
7cdaf587 | 4400 | io_req_init_async(req); |
b5dba59e JA |
4401 | req->work.flags |= IO_WQ_WORK_NO_CANCEL; |
4402 | ||
14587a46 | 4403 | if (unlikely(req->ctx->flags & IORING_SETUP_IOPOLL)) |
3232dd02 | 4404 | return -EINVAL; |
b5dba59e JA |
4405 | if (sqe->ioprio || sqe->off || sqe->addr || sqe->len || |
4406 | sqe->rw_flags || sqe->buf_index) | |
4407 | return -EINVAL; | |
9c280f90 | 4408 | if (req->flags & REQ_F_FIXED_FILE) |
cf3040ca | 4409 | return -EBADF; |
b5dba59e JA |
4410 | |
4411 | req->close.fd = READ_ONCE(sqe->fd); | |
0f212204 | 4412 | if ((req->file && req->file->f_op == &io_uring_fops)) |
fd2206e4 | 4413 | return -EBADF; |
b5dba59e | 4414 | |
3af73b28 | 4415 | req->close.put_file = NULL; |
b5dba59e | 4416 | return 0; |
b5dba59e JA |
4417 | } |
4418 | ||
229a7b63 JA |
4419 | static int io_close(struct io_kiocb *req, bool force_nonblock, |
4420 | struct io_comp_state *cs) | |
b5dba59e | 4421 | { |
3af73b28 | 4422 | struct io_close *close = &req->close; |
b5dba59e JA |
4423 | int ret; |
4424 | ||
3af73b28 PB |
4425 | /* might be already done during nonblock submission */ |
4426 | if (!close->put_file) { | |
4427 | ret = __close_fd_get_file(close->fd, &close->put_file); | |
4428 | if (ret < 0) | |
4429 | return (ret == -ENOENT) ? -EBADF : ret; | |
4430 | } | |
b5dba59e JA |
4431 | |
4432 | /* if the file has a flush method, be safe and punt to async */ | |
3af73b28 | 4433 | if (close->put_file->f_op->flush && force_nonblock) { |
24c74678 PB |
4434 | /* was never set, but play safe */ |
4435 | req->flags &= ~REQ_F_NOWAIT; | |
0bf0eefd | 4436 | /* avoid grabbing files - we don't need the files */ |
24c74678 | 4437 | req->flags |= REQ_F_NO_FILE_TABLE; |
0bf0eefd | 4438 | return -EAGAIN; |
a2100672 | 4439 | } |
b5dba59e | 4440 | |
3af73b28 | 4441 | /* No ->flush() or already async, safely close from here */ |
98447d65 | 4442 | ret = filp_close(close->put_file, req->work.identity->files); |
3af73b28 PB |
4443 | if (ret < 0) |
4444 | req_set_fail_links(req); | |
3af73b28 PB |
4445 | fput(close->put_file); |
4446 | close->put_file = NULL; | |
229a7b63 | 4447 | __io_req_complete(req, ret, 0, cs); |
1a417f4e | 4448 | return 0; |
b5dba59e JA |
4449 | } |
4450 | ||
3529d8c2 | 4451 | static int io_prep_sfr(struct io_kiocb *req, const struct io_uring_sqe *sqe) |
5d17b4a4 JA |
4452 | { |
4453 | struct io_ring_ctx *ctx = req->ctx; | |
5d17b4a4 JA |
4454 | |
4455 | if (!req->file) | |
4456 | return -EBADF; | |
5d17b4a4 JA |
4457 | |
4458 | if (unlikely(ctx->flags & IORING_SETUP_IOPOLL)) | |
4459 | return -EINVAL; | |
4460 | if (unlikely(sqe->addr || sqe->ioprio || sqe->buf_index)) | |
4461 | return -EINVAL; | |
4462 | ||
8ed8d3c3 JA |
4463 | req->sync.off = READ_ONCE(sqe->off); |
4464 | req->sync.len = READ_ONCE(sqe->len); | |
4465 | req->sync.flags = READ_ONCE(sqe->sync_range_flags); | |
8ed8d3c3 JA |
4466 | return 0; |
4467 | } | |
4468 | ||
ac45abc0 | 4469 | static int io_sync_file_range(struct io_kiocb *req, bool force_nonblock) |
8ed8d3c3 | 4470 | { |
8ed8d3c3 JA |
4471 | int ret; |
4472 | ||
ac45abc0 PB |
4473 | /* sync_file_range always requires a blocking context */ |
4474 | if (force_nonblock) | |
4475 | return -EAGAIN; | |
4476 | ||
9adbd45d | 4477 | ret = sync_file_range(req->file, req->sync.off, req->sync.len, |
8ed8d3c3 JA |
4478 | req->sync.flags); |
4479 | if (ret < 0) | |
4480 | req_set_fail_links(req); | |
e1e16097 | 4481 | io_req_complete(req, ret); |
5d17b4a4 JA |
4482 | return 0; |
4483 | } | |
4484 | ||
469956e8 | 4485 | #if defined(CONFIG_NET) |
02d27d89 PB |
4486 | static int io_setup_async_msg(struct io_kiocb *req, |
4487 | struct io_async_msghdr *kmsg) | |
4488 | { | |
e8c2bc1f JA |
4489 | struct io_async_msghdr *async_msg = req->async_data; |
4490 | ||
4491 | if (async_msg) | |
02d27d89 | 4492 | return -EAGAIN; |
e8c2bc1f | 4493 | if (io_alloc_async_data(req)) { |
02d27d89 PB |
4494 | if (kmsg->iov != kmsg->fast_iov) |
4495 | kfree(kmsg->iov); | |
4496 | return -ENOMEM; | |
4497 | } | |
e8c2bc1f | 4498 | async_msg = req->async_data; |
02d27d89 | 4499 | req->flags |= REQ_F_NEED_CLEANUP; |
e8c2bc1f | 4500 | memcpy(async_msg, kmsg, sizeof(*kmsg)); |
02d27d89 PB |
4501 | return -EAGAIN; |
4502 | } | |
4503 | ||
2ae523ed PB |
4504 | static int io_sendmsg_copy_hdr(struct io_kiocb *req, |
4505 | struct io_async_msghdr *iomsg) | |
4506 | { | |
4507 | iomsg->iov = iomsg->fast_iov; | |
4508 | iomsg->msg.msg_name = &iomsg->addr; | |
4509 | return sendmsg_copy_msghdr(&iomsg->msg, req->sr_msg.umsg, | |
4510 | req->sr_msg.msg_flags, &iomsg->iov); | |
4511 | } | |
4512 | ||
3529d8c2 | 4513 | static int io_sendmsg_prep(struct io_kiocb *req, const struct io_uring_sqe *sqe) |
03b1230c | 4514 | { |
e8c2bc1f | 4515 | struct io_async_msghdr *async_msg = req->async_data; |
e47293fd | 4516 | struct io_sr_msg *sr = &req->sr_msg; |
99bc4c38 | 4517 | int ret; |
03b1230c | 4518 | |
d2b6f48b PB |
4519 | if (unlikely(req->ctx->flags & IORING_SETUP_IOPOLL)) |
4520 | return -EINVAL; | |
4521 | ||
e47293fd | 4522 | sr->msg_flags = READ_ONCE(sqe->msg_flags); |
270a5940 | 4523 | sr->umsg = u64_to_user_ptr(READ_ONCE(sqe->addr)); |
fddaface | 4524 | sr->len = READ_ONCE(sqe->len); |
3529d8c2 | 4525 | |
d8768362 JA |
4526 | #ifdef CONFIG_COMPAT |
4527 | if (req->ctx->compat) | |
4528 | sr->msg_flags |= MSG_CMSG_COMPAT; | |
4529 | #endif | |
4530 | ||
e8c2bc1f | 4531 | if (!async_msg || !io_op_defs[req->opcode].needs_async_data) |
3529d8c2 | 4532 | return 0; |
e8c2bc1f | 4533 | ret = io_sendmsg_copy_hdr(req, async_msg); |
99bc4c38 PB |
4534 | if (!ret) |
4535 | req->flags |= REQ_F_NEED_CLEANUP; | |
4536 | return ret; | |
03b1230c JA |
4537 | } |
4538 | ||
229a7b63 JA |
4539 | static int io_sendmsg(struct io_kiocb *req, bool force_nonblock, |
4540 | struct io_comp_state *cs) | |
aa1fa28f | 4541 | { |
6b754c8b | 4542 | struct io_async_msghdr iomsg, *kmsg; |
0fa03c62 | 4543 | struct socket *sock; |
7a7cacba | 4544 | unsigned flags; |
0fa03c62 JA |
4545 | int ret; |
4546 | ||
0fa03c62 | 4547 | sock = sock_from_file(req->file, &ret); |
7a7cacba PB |
4548 | if (unlikely(!sock)) |
4549 | return ret; | |
3529d8c2 | 4550 | |
e8c2bc1f JA |
4551 | if (req->async_data) { |
4552 | kmsg = req->async_data; | |
4553 | kmsg->msg.msg_name = &kmsg->addr; | |
7a7cacba PB |
4554 | /* if iov is set, it's allocated already */ |
4555 | if (!kmsg->iov) | |
4556 | kmsg->iov = kmsg->fast_iov; | |
4557 | kmsg->msg.msg_iter.iov = kmsg->iov; | |
4558 | } else { | |
4559 | ret = io_sendmsg_copy_hdr(req, &iomsg); | |
4560 | if (ret) | |
4561 | return ret; | |
4562 | kmsg = &iomsg; | |
0fa03c62 | 4563 | } |
0fa03c62 | 4564 | |
7a7cacba PB |
4565 | flags = req->sr_msg.msg_flags; |
4566 | if (flags & MSG_DONTWAIT) | |
4567 | req->flags |= REQ_F_NOWAIT; | |
4568 | else if (force_nonblock) | |
4569 | flags |= MSG_DONTWAIT; | |
e47293fd | 4570 | |
7a7cacba PB |
4571 | ret = __sys_sendmsg_sock(sock, &kmsg->msg, flags); |
4572 | if (force_nonblock && ret == -EAGAIN) | |
4573 | return io_setup_async_msg(req, kmsg); | |
4574 | if (ret == -ERESTARTSYS) | |
4575 | ret = -EINTR; | |
0fa03c62 | 4576 | |
6b754c8b | 4577 | if (kmsg->iov != kmsg->fast_iov) |
0b416c3e | 4578 | kfree(kmsg->iov); |
99bc4c38 | 4579 | req->flags &= ~REQ_F_NEED_CLEANUP; |
4e88d6e7 JA |
4580 | if (ret < 0) |
4581 | req_set_fail_links(req); | |
229a7b63 | 4582 | __io_req_complete(req, ret, 0, cs); |
5d17b4a4 | 4583 | return 0; |
03b1230c | 4584 | } |
aa1fa28f | 4585 | |
229a7b63 JA |
4586 | static int io_send(struct io_kiocb *req, bool force_nonblock, |
4587 | struct io_comp_state *cs) | |
fddaface | 4588 | { |
7a7cacba PB |
4589 | struct io_sr_msg *sr = &req->sr_msg; |
4590 | struct msghdr msg; | |
4591 | struct iovec iov; | |
fddaface | 4592 | struct socket *sock; |
7a7cacba | 4593 | unsigned flags; |
fddaface JA |
4594 | int ret; |
4595 | ||
fddaface | 4596 | sock = sock_from_file(req->file, &ret); |
7a7cacba PB |
4597 | if (unlikely(!sock)) |
4598 | return ret; | |
fddaface | 4599 | |
7a7cacba PB |
4600 | ret = import_single_range(WRITE, sr->buf, sr->len, &iov, &msg.msg_iter); |
4601 | if (unlikely(ret)) | |
14db8411 | 4602 | return ret; |
fddaface | 4603 | |
7a7cacba PB |
4604 | msg.msg_name = NULL; |
4605 | msg.msg_control = NULL; | |
4606 | msg.msg_controllen = 0; | |
4607 | msg.msg_namelen = 0; | |
fddaface | 4608 | |
7a7cacba PB |
4609 | flags = req->sr_msg.msg_flags; |
4610 | if (flags & MSG_DONTWAIT) | |
4611 | req->flags |= REQ_F_NOWAIT; | |
4612 | else if (force_nonblock) | |
4613 | flags |= MSG_DONTWAIT; | |
fddaface | 4614 | |
7a7cacba PB |
4615 | msg.msg_flags = flags; |
4616 | ret = sock_sendmsg(sock, &msg); | |
4617 | if (force_nonblock && ret == -EAGAIN) | |
4618 | return -EAGAIN; | |
4619 | if (ret == -ERESTARTSYS) | |
4620 | ret = -EINTR; | |
fddaface | 4621 | |
fddaface JA |
4622 | if (ret < 0) |
4623 | req_set_fail_links(req); | |
229a7b63 | 4624 | __io_req_complete(req, ret, 0, cs); |
fddaface | 4625 | return 0; |
fddaface JA |
4626 | } |
4627 | ||
1400e697 PB |
4628 | static int __io_recvmsg_copy_hdr(struct io_kiocb *req, |
4629 | struct io_async_msghdr *iomsg) | |
52de1fe1 JA |
4630 | { |
4631 | struct io_sr_msg *sr = &req->sr_msg; | |
4632 | struct iovec __user *uiov; | |
4633 | size_t iov_len; | |
4634 | int ret; | |
4635 | ||
1400e697 PB |
4636 | ret = __copy_msghdr_from_user(&iomsg->msg, sr->umsg, |
4637 | &iomsg->uaddr, &uiov, &iov_len); | |
52de1fe1 JA |
4638 | if (ret) |
4639 | return ret; | |
4640 | ||
4641 | if (req->flags & REQ_F_BUFFER_SELECT) { | |
4642 | if (iov_len > 1) | |
4643 | return -EINVAL; | |
1400e697 | 4644 | if (copy_from_user(iomsg->iov, uiov, sizeof(*uiov))) |
52de1fe1 | 4645 | return -EFAULT; |
1400e697 PB |
4646 | sr->len = iomsg->iov[0].iov_len; |
4647 | iov_iter_init(&iomsg->msg.msg_iter, READ, iomsg->iov, 1, | |
52de1fe1 | 4648 | sr->len); |
1400e697 | 4649 | iomsg->iov = NULL; |
52de1fe1 | 4650 | } else { |
89cd35c5 CH |
4651 | ret = __import_iovec(READ, uiov, iov_len, UIO_FASTIOV, |
4652 | &iomsg->iov, &iomsg->msg.msg_iter, | |
4653 | false); | |
52de1fe1 JA |
4654 | if (ret > 0) |
4655 | ret = 0; | |
4656 | } | |
4657 | ||
4658 | return ret; | |
4659 | } | |
4660 | ||
4661 | #ifdef CONFIG_COMPAT | |
4662 | static int __io_compat_recvmsg_copy_hdr(struct io_kiocb *req, | |
1400e697 | 4663 | struct io_async_msghdr *iomsg) |
52de1fe1 JA |
4664 | { |
4665 | struct compat_msghdr __user *msg_compat; | |
4666 | struct io_sr_msg *sr = &req->sr_msg; | |
4667 | struct compat_iovec __user *uiov; | |
4668 | compat_uptr_t ptr; | |
4669 | compat_size_t len; | |
4670 | int ret; | |
4671 | ||
270a5940 | 4672 | msg_compat = (struct compat_msghdr __user *) sr->umsg; |
1400e697 | 4673 | ret = __get_compat_msghdr(&iomsg->msg, msg_compat, &iomsg->uaddr, |
52de1fe1 JA |
4674 | &ptr, &len); |
4675 | if (ret) | |
4676 | return ret; | |
4677 | ||
4678 | uiov = compat_ptr(ptr); | |
4679 | if (req->flags & REQ_F_BUFFER_SELECT) { | |
4680 | compat_ssize_t clen; | |
4681 | ||
4682 | if (len > 1) | |
4683 | return -EINVAL; | |
4684 | if (!access_ok(uiov, sizeof(*uiov))) | |
4685 | return -EFAULT; | |
4686 | if (__get_user(clen, &uiov->iov_len)) | |
4687 | return -EFAULT; | |
4688 | if (clen < 0) | |
4689 | return -EINVAL; | |
1400e697 PB |
4690 | sr->len = iomsg->iov[0].iov_len; |
4691 | iomsg->iov = NULL; | |
52de1fe1 | 4692 | } else { |
89cd35c5 CH |
4693 | ret = __import_iovec(READ, (struct iovec __user *)uiov, len, |
4694 | UIO_FASTIOV, &iomsg->iov, | |
4695 | &iomsg->msg.msg_iter, true); | |
52de1fe1 JA |
4696 | if (ret < 0) |
4697 | return ret; | |
4698 | } | |
4699 | ||
4700 | return 0; | |
4701 | } | |
4702 | #endif | |
4703 | ||
1400e697 PB |
4704 | static int io_recvmsg_copy_hdr(struct io_kiocb *req, |
4705 | struct io_async_msghdr *iomsg) | |
52de1fe1 | 4706 | { |
1400e697 PB |
4707 | iomsg->msg.msg_name = &iomsg->addr; |
4708 | iomsg->iov = iomsg->fast_iov; | |
52de1fe1 JA |
4709 | |
4710 | #ifdef CONFIG_COMPAT | |
4711 | if (req->ctx->compat) | |
1400e697 | 4712 | return __io_compat_recvmsg_copy_hdr(req, iomsg); |
fddaface | 4713 | #endif |
52de1fe1 | 4714 | |
1400e697 | 4715 | return __io_recvmsg_copy_hdr(req, iomsg); |
52de1fe1 JA |
4716 | } |
4717 | ||
bcda7baa | 4718 | static struct io_buffer *io_recv_buffer_select(struct io_kiocb *req, |
7fbb1b54 | 4719 | bool needs_lock) |
bcda7baa JA |
4720 | { |
4721 | struct io_sr_msg *sr = &req->sr_msg; | |
4722 | struct io_buffer *kbuf; | |
4723 | ||
bcda7baa JA |
4724 | kbuf = io_buffer_select(req, &sr->len, sr->bgid, sr->kbuf, needs_lock); |
4725 | if (IS_ERR(kbuf)) | |
4726 | return kbuf; | |
4727 | ||
4728 | sr->kbuf = kbuf; | |
4729 | req->flags |= REQ_F_BUFFER_SELECTED; | |
bcda7baa | 4730 | return kbuf; |
fddaface JA |
4731 | } |
4732 | ||
7fbb1b54 PB |
4733 | static inline unsigned int io_put_recv_kbuf(struct io_kiocb *req) |
4734 | { | |
4735 | return io_put_kbuf(req, req->sr_msg.kbuf); | |
4736 | } | |
4737 | ||
3529d8c2 JA |
4738 | static int io_recvmsg_prep(struct io_kiocb *req, |
4739 | const struct io_uring_sqe *sqe) | |
aa1fa28f | 4740 | { |
e8c2bc1f | 4741 | struct io_async_msghdr *async_msg = req->async_data; |
e47293fd | 4742 | struct io_sr_msg *sr = &req->sr_msg; |
99bc4c38 | 4743 | int ret; |
3529d8c2 | 4744 | |
d2b6f48b PB |
4745 | if (unlikely(req->ctx->flags & IORING_SETUP_IOPOLL)) |
4746 | return -EINVAL; | |
4747 | ||
3529d8c2 | 4748 | sr->msg_flags = READ_ONCE(sqe->msg_flags); |
270a5940 | 4749 | sr->umsg = u64_to_user_ptr(READ_ONCE(sqe->addr)); |
0b7b21e4 | 4750 | sr->len = READ_ONCE(sqe->len); |
bcda7baa | 4751 | sr->bgid = READ_ONCE(sqe->buf_group); |
06b76d44 | 4752 | |
d8768362 JA |
4753 | #ifdef CONFIG_COMPAT |
4754 | if (req->ctx->compat) | |
4755 | sr->msg_flags |= MSG_CMSG_COMPAT; | |
4756 | #endif | |
4757 | ||
e8c2bc1f | 4758 | if (!async_msg || !io_op_defs[req->opcode].needs_async_data) |
5f798bea | 4759 | return 0; |
e8c2bc1f | 4760 | ret = io_recvmsg_copy_hdr(req, async_msg); |
99bc4c38 PB |
4761 | if (!ret) |
4762 | req->flags |= REQ_F_NEED_CLEANUP; | |
4763 | return ret; | |
aa1fa28f JA |
4764 | } |
4765 | ||
229a7b63 JA |
4766 | static int io_recvmsg(struct io_kiocb *req, bool force_nonblock, |
4767 | struct io_comp_state *cs) | |
aa1fa28f | 4768 | { |
6b754c8b | 4769 | struct io_async_msghdr iomsg, *kmsg; |
03b1230c | 4770 | struct socket *sock; |
7fbb1b54 | 4771 | struct io_buffer *kbuf; |
7a7cacba | 4772 | unsigned flags; |
52de1fe1 | 4773 | int ret, cflags = 0; |
03b1230c | 4774 | |
03b1230c | 4775 | sock = sock_from_file(req->file, &ret); |
7a7cacba PB |
4776 | if (unlikely(!sock)) |
4777 | return ret; | |
3529d8c2 | 4778 | |
e8c2bc1f JA |
4779 | if (req->async_data) { |
4780 | kmsg = req->async_data; | |
4781 | kmsg->msg.msg_name = &kmsg->addr; | |
7a7cacba PB |
4782 | /* if iov is set, it's allocated already */ |
4783 | if (!kmsg->iov) | |
4784 | kmsg->iov = kmsg->fast_iov; | |
4785 | kmsg->msg.msg_iter.iov = kmsg->iov; | |
4786 | } else { | |
4787 | ret = io_recvmsg_copy_hdr(req, &iomsg); | |
4788 | if (ret) | |
681fda8d | 4789 | return ret; |
7a7cacba PB |
4790 | kmsg = &iomsg; |
4791 | } | |
03b1230c | 4792 | |
bc02ef33 | 4793 | if (req->flags & REQ_F_BUFFER_SELECT) { |
7fbb1b54 | 4794 | kbuf = io_recv_buffer_select(req, !force_nonblock); |
bc02ef33 | 4795 | if (IS_ERR(kbuf)) |
52de1fe1 | 4796 | return PTR_ERR(kbuf); |
7a7cacba PB |
4797 | kmsg->fast_iov[0].iov_base = u64_to_user_ptr(kbuf->addr); |
4798 | iov_iter_init(&kmsg->msg.msg_iter, READ, kmsg->iov, | |
4799 | 1, req->sr_msg.len); | |
4800 | } | |
52de1fe1 | 4801 | |
7a7cacba PB |
4802 | flags = req->sr_msg.msg_flags; |
4803 | if (flags & MSG_DONTWAIT) | |
4804 | req->flags |= REQ_F_NOWAIT; | |
4805 | else if (force_nonblock) | |
4806 | flags |= MSG_DONTWAIT; | |
e47293fd | 4807 | |
7a7cacba PB |
4808 | ret = __sys_recvmsg_sock(sock, &kmsg->msg, req->sr_msg.umsg, |
4809 | kmsg->uaddr, flags); | |
0e1b6fe3 PB |
4810 | if (force_nonblock && ret == -EAGAIN) |
4811 | return io_setup_async_msg(req, kmsg); | |
7a7cacba PB |
4812 | if (ret == -ERESTARTSYS) |
4813 | ret = -EINTR; | |
03b1230c | 4814 | |
7fbb1b54 PB |
4815 | if (req->flags & REQ_F_BUFFER_SELECTED) |
4816 | cflags = io_put_recv_kbuf(req); | |
6b754c8b | 4817 | if (kmsg->iov != kmsg->fast_iov) |
0b416c3e | 4818 | kfree(kmsg->iov); |
99bc4c38 | 4819 | req->flags &= ~REQ_F_NEED_CLEANUP; |
4e88d6e7 JA |
4820 | if (ret < 0) |
4821 | req_set_fail_links(req); | |
229a7b63 | 4822 | __io_req_complete(req, ret, cflags, cs); |
03b1230c | 4823 | return 0; |
0fa03c62 | 4824 | } |
5d17b4a4 | 4825 | |
229a7b63 JA |
4826 | static int io_recv(struct io_kiocb *req, bool force_nonblock, |
4827 | struct io_comp_state *cs) | |
fddaface | 4828 | { |
6b754c8b | 4829 | struct io_buffer *kbuf; |
7a7cacba PB |
4830 | struct io_sr_msg *sr = &req->sr_msg; |
4831 | struct msghdr msg; | |
4832 | void __user *buf = sr->buf; | |
fddaface | 4833 | struct socket *sock; |
7a7cacba PB |
4834 | struct iovec iov; |
4835 | unsigned flags; | |
bcda7baa | 4836 | int ret, cflags = 0; |
fddaface | 4837 | |
fddaface | 4838 | sock = sock_from_file(req->file, &ret); |
7a7cacba PB |
4839 | if (unlikely(!sock)) |
4840 | return ret; | |
fddaface | 4841 | |
bc02ef33 | 4842 | if (req->flags & REQ_F_BUFFER_SELECT) { |
7fbb1b54 | 4843 | kbuf = io_recv_buffer_select(req, !force_nonblock); |
bcda7baa JA |
4844 | if (IS_ERR(kbuf)) |
4845 | return PTR_ERR(kbuf); | |
7a7cacba | 4846 | buf = u64_to_user_ptr(kbuf->addr); |
bc02ef33 | 4847 | } |
bcda7baa | 4848 | |
7a7cacba | 4849 | ret = import_single_range(READ, buf, sr->len, &iov, &msg.msg_iter); |
14c32eee PB |
4850 | if (unlikely(ret)) |
4851 | goto out_free; | |
fddaface | 4852 | |
7a7cacba PB |
4853 | msg.msg_name = NULL; |
4854 | msg.msg_control = NULL; | |
4855 | msg.msg_controllen = 0; | |
4856 | msg.msg_namelen = 0; | |
4857 | msg.msg_iocb = NULL; | |
4858 | msg.msg_flags = 0; | |
fddaface | 4859 | |
7a7cacba PB |
4860 | flags = req->sr_msg.msg_flags; |
4861 | if (flags & MSG_DONTWAIT) | |
4862 | req->flags |= REQ_F_NOWAIT; | |
4863 | else if (force_nonblock) | |
4864 | flags |= MSG_DONTWAIT; | |
4865 | ||
4866 | ret = sock_recvmsg(sock, &msg, flags); | |
4867 | if (force_nonblock && ret == -EAGAIN) | |
4868 | return -EAGAIN; | |
4869 | if (ret == -ERESTARTSYS) | |
4870 | ret = -EINTR; | |
14c32eee | 4871 | out_free: |
7fbb1b54 PB |
4872 | if (req->flags & REQ_F_BUFFER_SELECTED) |
4873 | cflags = io_put_recv_kbuf(req); | |
fddaface JA |
4874 | if (ret < 0) |
4875 | req_set_fail_links(req); | |
229a7b63 | 4876 | __io_req_complete(req, ret, cflags, cs); |
fddaface | 4877 | return 0; |
fddaface JA |
4878 | } |
4879 | ||
3529d8c2 | 4880 | static int io_accept_prep(struct io_kiocb *req, const struct io_uring_sqe *sqe) |
17f2fe35 | 4881 | { |
8ed8d3c3 JA |
4882 | struct io_accept *accept = &req->accept; |
4883 | ||
14587a46 | 4884 | if (unlikely(req->ctx->flags & IORING_SETUP_IOPOLL)) |
17f2fe35 | 4885 | return -EINVAL; |
8042d6ce | 4886 | if (sqe->ioprio || sqe->len || sqe->buf_index) |
17f2fe35 JA |
4887 | return -EINVAL; |
4888 | ||
d55e5f5b JA |
4889 | accept->addr = u64_to_user_ptr(READ_ONCE(sqe->addr)); |
4890 | accept->addr_len = u64_to_user_ptr(READ_ONCE(sqe->addr2)); | |
8ed8d3c3 | 4891 | accept->flags = READ_ONCE(sqe->accept_flags); |
09952e3e | 4892 | accept->nofile = rlimit(RLIMIT_NOFILE); |
8ed8d3c3 | 4893 | return 0; |
8ed8d3c3 | 4894 | } |
17f2fe35 | 4895 | |
229a7b63 JA |
4896 | static int io_accept(struct io_kiocb *req, bool force_nonblock, |
4897 | struct io_comp_state *cs) | |
8ed8d3c3 JA |
4898 | { |
4899 | struct io_accept *accept = &req->accept; | |
ac45abc0 | 4900 | unsigned int file_flags = force_nonblock ? O_NONBLOCK : 0; |
8ed8d3c3 JA |
4901 | int ret; |
4902 | ||
e697deed JX |
4903 | if (req->file->f_flags & O_NONBLOCK) |
4904 | req->flags |= REQ_F_NOWAIT; | |
4905 | ||
8ed8d3c3 | 4906 | ret = __sys_accept4_file(req->file, file_flags, accept->addr, |
09952e3e JA |
4907 | accept->addr_len, accept->flags, |
4908 | accept->nofile); | |
8ed8d3c3 | 4909 | if (ret == -EAGAIN && force_nonblock) |
17f2fe35 | 4910 | return -EAGAIN; |
ac45abc0 PB |
4911 | if (ret < 0) { |
4912 | if (ret == -ERESTARTSYS) | |
4913 | ret = -EINTR; | |
4e88d6e7 | 4914 | req_set_fail_links(req); |
ac45abc0 | 4915 | } |
229a7b63 | 4916 | __io_req_complete(req, ret, 0, cs); |
17f2fe35 | 4917 | return 0; |
8ed8d3c3 JA |
4918 | } |
4919 | ||
3529d8c2 | 4920 | static int io_connect_prep(struct io_kiocb *req, const struct io_uring_sqe *sqe) |
f499a021 | 4921 | { |
3529d8c2 | 4922 | struct io_connect *conn = &req->connect; |
e8c2bc1f | 4923 | struct io_async_connect *io = req->async_data; |
f499a021 | 4924 | |
14587a46 | 4925 | if (unlikely(req->ctx->flags & IORING_SETUP_IOPOLL)) |
3fbb51c1 JA |
4926 | return -EINVAL; |
4927 | if (sqe->ioprio || sqe->len || sqe->buf_index || sqe->rw_flags) | |
4928 | return -EINVAL; | |
4929 | ||
3529d8c2 JA |
4930 | conn->addr = u64_to_user_ptr(READ_ONCE(sqe->addr)); |
4931 | conn->addr_len = READ_ONCE(sqe->addr2); | |
4932 | ||
4933 | if (!io) | |
4934 | return 0; | |
4935 | ||
4936 | return move_addr_to_kernel(conn->addr, conn->addr_len, | |
e8c2bc1f | 4937 | &io->address); |
f499a021 JA |
4938 | } |
4939 | ||
229a7b63 JA |
4940 | static int io_connect(struct io_kiocb *req, bool force_nonblock, |
4941 | struct io_comp_state *cs) | |
f8e85cf2 | 4942 | { |
e8c2bc1f | 4943 | struct io_async_connect __io, *io; |
f8e85cf2 | 4944 | unsigned file_flags; |
3fbb51c1 | 4945 | int ret; |
f8e85cf2 | 4946 | |
e8c2bc1f JA |
4947 | if (req->async_data) { |
4948 | io = req->async_data; | |
f499a021 | 4949 | } else { |
3529d8c2 JA |
4950 | ret = move_addr_to_kernel(req->connect.addr, |
4951 | req->connect.addr_len, | |
e8c2bc1f | 4952 | &__io.address); |
f499a021 JA |
4953 | if (ret) |
4954 | goto out; | |
4955 | io = &__io; | |
4956 | } | |
4957 | ||
3fbb51c1 JA |
4958 | file_flags = force_nonblock ? O_NONBLOCK : 0; |
4959 | ||
e8c2bc1f | 4960 | ret = __sys_connect_file(req->file, &io->address, |
3fbb51c1 | 4961 | req->connect.addr_len, file_flags); |
87f80d62 | 4962 | if ((ret == -EAGAIN || ret == -EINPROGRESS) && force_nonblock) { |
e8c2bc1f | 4963 | if (req->async_data) |
b7bb4f7d | 4964 | return -EAGAIN; |
e8c2bc1f | 4965 | if (io_alloc_async_data(req)) { |
f499a021 JA |
4966 | ret = -ENOMEM; |
4967 | goto out; | |
4968 | } | |
e8c2bc1f JA |
4969 | io = req->async_data; |
4970 | memcpy(req->async_data, &__io, sizeof(__io)); | |
f8e85cf2 | 4971 | return -EAGAIN; |
f499a021 | 4972 | } |
f8e85cf2 JA |
4973 | if (ret == -ERESTARTSYS) |
4974 | ret = -EINTR; | |
f499a021 | 4975 | out: |
4e88d6e7 JA |
4976 | if (ret < 0) |
4977 | req_set_fail_links(req); | |
229a7b63 | 4978 | __io_req_complete(req, ret, 0, cs); |
f8e85cf2 | 4979 | return 0; |
469956e8 Y |
4980 | } |
4981 | #else /* !CONFIG_NET */ | |
4982 | static int io_sendmsg_prep(struct io_kiocb *req, const struct io_uring_sqe *sqe) | |
4983 | { | |
f8e85cf2 | 4984 | return -EOPNOTSUPP; |
f8e85cf2 JA |
4985 | } |
4986 | ||
1e16c2f9 RD |
4987 | static int io_sendmsg(struct io_kiocb *req, bool force_nonblock, |
4988 | struct io_comp_state *cs) | |
469956e8 Y |
4989 | { |
4990 | return -EOPNOTSUPP; | |
4991 | } | |
4992 | ||
1e16c2f9 RD |
4993 | static int io_send(struct io_kiocb *req, bool force_nonblock, |
4994 | struct io_comp_state *cs) | |
469956e8 Y |
4995 | { |
4996 | return -EOPNOTSUPP; | |
4997 | } | |
4998 | ||
4999 | static int io_recvmsg_prep(struct io_kiocb *req, | |
5000 | const struct io_uring_sqe *sqe) | |
5001 | { | |
5002 | return -EOPNOTSUPP; | |
5003 | } | |
5004 | ||
1e16c2f9 RD |
5005 | static int io_recvmsg(struct io_kiocb *req, bool force_nonblock, |
5006 | struct io_comp_state *cs) | |
469956e8 Y |
5007 | { |
5008 | return -EOPNOTSUPP; | |
5009 | } | |
5010 | ||
1e16c2f9 RD |
5011 | static int io_recv(struct io_kiocb *req, bool force_nonblock, |
5012 | struct io_comp_state *cs) | |
469956e8 Y |
5013 | { |
5014 | return -EOPNOTSUPP; | |
5015 | } | |
5016 | ||
5017 | static int io_accept_prep(struct io_kiocb *req, const struct io_uring_sqe *sqe) | |
5018 | { | |
5019 | return -EOPNOTSUPP; | |
5020 | } | |
5021 | ||
1e16c2f9 RD |
5022 | static int io_accept(struct io_kiocb *req, bool force_nonblock, |
5023 | struct io_comp_state *cs) | |
469956e8 Y |
5024 | { |
5025 | return -EOPNOTSUPP; | |
5026 | } | |
ce593a6c | 5027 | |
469956e8 Y |
5028 | static int io_connect_prep(struct io_kiocb *req, const struct io_uring_sqe *sqe) |
5029 | { | |
5030 | return -EOPNOTSUPP; | |
5031 | } | |
5032 | ||
1e16c2f9 RD |
5033 | static int io_connect(struct io_kiocb *req, bool force_nonblock, |
5034 | struct io_comp_state *cs) | |
469956e8 | 5035 | { |
f8e85cf2 | 5036 | return -EOPNOTSUPP; |
ce593a6c | 5037 | } |
469956e8 | 5038 | #endif /* CONFIG_NET */ |
f8e85cf2 | 5039 | |
d7718a9d JA |
5040 | struct io_poll_table { |
5041 | struct poll_table_struct pt; | |
5042 | struct io_kiocb *req; | |
5043 | int error; | |
5044 | }; | |
ce593a6c | 5045 | |
d7718a9d JA |
5046 | static int __io_async_wake(struct io_kiocb *req, struct io_poll_iocb *poll, |
5047 | __poll_t mask, task_work_func_t func) | |
5048 | { | |
fd7d6de2 | 5049 | bool twa_signal_ok; |
aa96bf8a | 5050 | int ret; |
d7718a9d JA |
5051 | |
5052 | /* for instances that support it check for an event match first: */ | |
5053 | if (mask && !(mask & poll->events)) | |
5054 | return 0; | |
5055 | ||
5056 | trace_io_uring_task_add(req->ctx, req->opcode, req->user_data, mask); | |
5057 | ||
5058 | list_del_init(&poll->wait.entry); | |
5059 | ||
d7718a9d JA |
5060 | req->result = mask; |
5061 | init_task_work(&req->task_work, func); | |
6d816e08 JA |
5062 | percpu_ref_get(&req->ctx->refs); |
5063 | ||
fd7d6de2 JA |
5064 | /* |
5065 | * If we using the signalfd wait_queue_head for this wakeup, then | |
5066 | * it's not safe to use TWA_SIGNAL as we could be recursing on the | |
5067 | * tsk->sighand->siglock on doing the wakeup. Should not be needed | |
5068 | * either, as the normal wakeup will suffice. | |
5069 | */ | |
5070 | twa_signal_ok = (poll->head != &req->task->sighand->signalfd_wqh); | |
5071 | ||
d7718a9d | 5072 | /* |
e3aabf95 JA |
5073 | * If this fails, then the task is exiting. When a task exits, the |
5074 | * work gets canceled, so just cancel this request as well instead | |
5075 | * of executing it. We can't safely execute it anyway, as we may not | |
5076 | * have the needed state needed for it anyway. | |
d7718a9d | 5077 | */ |
87c4311f | 5078 | ret = io_req_task_work_add(req, twa_signal_ok); |
aa96bf8a | 5079 | if (unlikely(ret)) { |
c2c4c83c JA |
5080 | struct task_struct *tsk; |
5081 | ||
e3aabf95 | 5082 | WRITE_ONCE(poll->canceled, true); |
aa96bf8a | 5083 | tsk = io_wq_get_task(req->ctx->io_wq); |
91989c70 | 5084 | task_work_add(tsk, &req->task_work, TWA_NONE); |
ce593a6c | 5085 | wake_up_process(tsk); |
aa96bf8a | 5086 | } |
d7718a9d JA |
5087 | return 1; |
5088 | } | |
5089 | ||
74ce6ce4 JA |
5090 | static bool io_poll_rewait(struct io_kiocb *req, struct io_poll_iocb *poll) |
5091 | __acquires(&req->ctx->completion_lock) | |
5092 | { | |
5093 | struct io_ring_ctx *ctx = req->ctx; | |
5094 | ||
5095 | if (!req->result && !READ_ONCE(poll->canceled)) { | |
5096 | struct poll_table_struct pt = { ._key = poll->events }; | |
5097 | ||
5098 | req->result = vfs_poll(req->file, &pt) & poll->events; | |
5099 | } | |
5100 | ||
5101 | spin_lock_irq(&ctx->completion_lock); | |
5102 | if (!req->result && !READ_ONCE(poll->canceled)) { | |
5103 | add_wait_queue(poll->head, &poll->wait); | |
5104 | return true; | |
5105 | } | |
5106 | ||
5107 | return false; | |
5108 | } | |
5109 | ||
d4e7cd36 | 5110 | static struct io_poll_iocb *io_poll_get_double(struct io_kiocb *req) |
18bceab1 | 5111 | { |
e8c2bc1f | 5112 | /* pure poll stashes this in ->async_data, poll driven retry elsewhere */ |
d4e7cd36 | 5113 | if (req->opcode == IORING_OP_POLL_ADD) |
e8c2bc1f | 5114 | return req->async_data; |
d4e7cd36 JA |
5115 | return req->apoll->double_poll; |
5116 | } | |
5117 | ||
5118 | static struct io_poll_iocb *io_poll_get_single(struct io_kiocb *req) | |
5119 | { | |
5120 | if (req->opcode == IORING_OP_POLL_ADD) | |
5121 | return &req->poll; | |
5122 | return &req->apoll->poll; | |
5123 | } | |
5124 | ||
5125 | static void io_poll_remove_double(struct io_kiocb *req) | |
5126 | { | |
5127 | struct io_poll_iocb *poll = io_poll_get_double(req); | |
18bceab1 JA |
5128 | |
5129 | lockdep_assert_held(&req->ctx->completion_lock); | |
5130 | ||
5131 | if (poll && poll->head) { | |
5132 | struct wait_queue_head *head = poll->head; | |
5133 | ||
5134 | spin_lock(&head->lock); | |
5135 | list_del_init(&poll->wait.entry); | |
5136 | if (poll->wait.private) | |
5137 | refcount_dec(&req->refs); | |
5138 | poll->head = NULL; | |
5139 | spin_unlock(&head->lock); | |
5140 | } | |
5141 | } | |
5142 | ||
5143 | static void io_poll_complete(struct io_kiocb *req, __poll_t mask, int error) | |
5144 | { | |
5145 | struct io_ring_ctx *ctx = req->ctx; | |
5146 | ||
d4e7cd36 | 5147 | io_poll_remove_double(req); |
18bceab1 JA |
5148 | req->poll.done = true; |
5149 | io_cqring_fill_event(req, error ? error : mangle_poll(mask)); | |
5150 | io_commit_cqring(ctx); | |
5151 | } | |
5152 | ||
dd221f46 | 5153 | static void io_poll_task_func(struct callback_head *cb) |
18bceab1 | 5154 | { |
dd221f46 | 5155 | struct io_kiocb *req = container_of(cb, struct io_kiocb, task_work); |
18bceab1 | 5156 | struct io_ring_ctx *ctx = req->ctx; |
dd221f46 | 5157 | struct io_kiocb *nxt; |
18bceab1 JA |
5158 | |
5159 | if (io_poll_rewait(req, &req->poll)) { | |
5160 | spin_unlock_irq(&ctx->completion_lock); | |
dd221f46 PB |
5161 | } else { |
5162 | hash_del(&req->hash_node); | |
5163 | io_poll_complete(req, req->result, 0); | |
5164 | spin_unlock_irq(&ctx->completion_lock); | |
18bceab1 | 5165 | |
dd221f46 PB |
5166 | nxt = io_put_req_find_next(req); |
5167 | io_cqring_ev_posted(ctx); | |
5168 | if (nxt) | |
5169 | __io_req_task_submit(nxt); | |
5170 | } | |
18bceab1 | 5171 | |
6d816e08 | 5172 | percpu_ref_put(&ctx->refs); |
18bceab1 JA |
5173 | } |
5174 | ||
5175 | static int io_poll_double_wake(struct wait_queue_entry *wait, unsigned mode, | |
5176 | int sync, void *key) | |
5177 | { | |
5178 | struct io_kiocb *req = wait->private; | |
d4e7cd36 | 5179 | struct io_poll_iocb *poll = io_poll_get_single(req); |
18bceab1 JA |
5180 | __poll_t mask = key_to_poll(key); |
5181 | ||
5182 | /* for instances that support it check for an event match first: */ | |
5183 | if (mask && !(mask & poll->events)) | |
5184 | return 0; | |
5185 | ||
8706e04e JA |
5186 | list_del_init(&wait->entry); |
5187 | ||
807abcb0 | 5188 | if (poll && poll->head) { |
18bceab1 JA |
5189 | bool done; |
5190 | ||
807abcb0 JA |
5191 | spin_lock(&poll->head->lock); |
5192 | done = list_empty(&poll->wait.entry); | |
18bceab1 | 5193 | if (!done) |
807abcb0 | 5194 | list_del_init(&poll->wait.entry); |
d4e7cd36 JA |
5195 | /* make sure double remove sees this as being gone */ |
5196 | wait->private = NULL; | |
807abcb0 | 5197 | spin_unlock(&poll->head->lock); |
c8b5e260 JA |
5198 | if (!done) { |
5199 | /* use wait func handler, so it matches the rq type */ | |
5200 | poll->wait.func(&poll->wait, mode, sync, key); | |
5201 | } | |
18bceab1 JA |
5202 | } |
5203 | refcount_dec(&req->refs); | |
5204 | return 1; | |
5205 | } | |
5206 | ||
5207 | static void io_init_poll_iocb(struct io_poll_iocb *poll, __poll_t events, | |
5208 | wait_queue_func_t wake_func) | |
5209 | { | |
5210 | poll->head = NULL; | |
5211 | poll->done = false; | |
5212 | poll->canceled = false; | |
5213 | poll->events = events; | |
5214 | INIT_LIST_HEAD(&poll->wait.entry); | |
5215 | init_waitqueue_func_entry(&poll->wait, wake_func); | |
5216 | } | |
5217 | ||
5218 | static void __io_queue_proc(struct io_poll_iocb *poll, struct io_poll_table *pt, | |
807abcb0 JA |
5219 | struct wait_queue_head *head, |
5220 | struct io_poll_iocb **poll_ptr) | |
18bceab1 JA |
5221 | { |
5222 | struct io_kiocb *req = pt->req; | |
5223 | ||
5224 | /* | |
5225 | * If poll->head is already set, it's because the file being polled | |
5226 | * uses multiple waitqueues for poll handling (eg one for read, one | |
5227 | * for write). Setup a separate io_poll_iocb if this happens. | |
5228 | */ | |
5229 | if (unlikely(poll->head)) { | |
58852d4d PB |
5230 | struct io_poll_iocb *poll_one = poll; |
5231 | ||
18bceab1 | 5232 | /* already have a 2nd entry, fail a third attempt */ |
807abcb0 | 5233 | if (*poll_ptr) { |
18bceab1 JA |
5234 | pt->error = -EINVAL; |
5235 | return; | |
5236 | } | |
5237 | poll = kmalloc(sizeof(*poll), GFP_ATOMIC); | |
5238 | if (!poll) { | |
5239 | pt->error = -ENOMEM; | |
5240 | return; | |
5241 | } | |
58852d4d | 5242 | io_init_poll_iocb(poll, poll_one->events, io_poll_double_wake); |
18bceab1 JA |
5243 | refcount_inc(&req->refs); |
5244 | poll->wait.private = req; | |
807abcb0 | 5245 | *poll_ptr = poll; |
18bceab1 JA |
5246 | } |
5247 | ||
5248 | pt->error = 0; | |
5249 | poll->head = head; | |
a31eb4a2 JX |
5250 | |
5251 | if (poll->events & EPOLLEXCLUSIVE) | |
5252 | add_wait_queue_exclusive(head, &poll->wait); | |
5253 | else | |
5254 | add_wait_queue(head, &poll->wait); | |
18bceab1 JA |
5255 | } |
5256 | ||
5257 | static void io_async_queue_proc(struct file *file, struct wait_queue_head *head, | |
5258 | struct poll_table_struct *p) | |
5259 | { | |
5260 | struct io_poll_table *pt = container_of(p, struct io_poll_table, pt); | |
807abcb0 | 5261 | struct async_poll *apoll = pt->req->apoll; |
18bceab1 | 5262 | |
807abcb0 | 5263 | __io_queue_proc(&apoll->poll, pt, head, &apoll->double_poll); |
18bceab1 JA |
5264 | } |
5265 | ||
d7718a9d JA |
5266 | static void io_async_task_func(struct callback_head *cb) |
5267 | { | |
5268 | struct io_kiocb *req = container_of(cb, struct io_kiocb, task_work); | |
5269 | struct async_poll *apoll = req->apoll; | |
5270 | struct io_ring_ctx *ctx = req->ctx; | |
5271 | ||
5272 | trace_io_uring_task_run(req->ctx, req->opcode, req->user_data); | |
5273 | ||
74ce6ce4 | 5274 | if (io_poll_rewait(req, &apoll->poll)) { |
d7718a9d | 5275 | spin_unlock_irq(&ctx->completion_lock); |
6d816e08 | 5276 | percpu_ref_put(&ctx->refs); |
74ce6ce4 | 5277 | return; |
d7718a9d JA |
5278 | } |
5279 | ||
31067255 | 5280 | /* If req is still hashed, it cannot have been canceled. Don't check. */ |
0be0b0e3 | 5281 | if (hash_hashed(&req->hash_node)) |
74ce6ce4 | 5282 | hash_del(&req->hash_node); |
2bae047e | 5283 | |
d4e7cd36 | 5284 | io_poll_remove_double(req); |
74ce6ce4 JA |
5285 | spin_unlock_irq(&ctx->completion_lock); |
5286 | ||
0be0b0e3 PB |
5287 | if (!READ_ONCE(apoll->poll.canceled)) |
5288 | __io_req_task_submit(req); | |
5289 | else | |
5290 | __io_req_task_cancel(req, -ECANCELED); | |
aa340845 | 5291 | |
6d816e08 | 5292 | percpu_ref_put(&ctx->refs); |
807abcb0 | 5293 | kfree(apoll->double_poll); |
31067255 | 5294 | kfree(apoll); |
d7718a9d JA |
5295 | } |
5296 | ||
5297 | static int io_async_wake(struct wait_queue_entry *wait, unsigned mode, int sync, | |
5298 | void *key) | |
5299 | { | |
5300 | struct io_kiocb *req = wait->private; | |
5301 | struct io_poll_iocb *poll = &req->apoll->poll; | |
5302 | ||
5303 | trace_io_uring_poll_wake(req->ctx, req->opcode, req->user_data, | |
5304 | key_to_poll(key)); | |
5305 | ||
5306 | return __io_async_wake(req, poll, key_to_poll(key), io_async_task_func); | |
5307 | } | |
5308 | ||
5309 | static void io_poll_req_insert(struct io_kiocb *req) | |
5310 | { | |
5311 | struct io_ring_ctx *ctx = req->ctx; | |
5312 | struct hlist_head *list; | |
5313 | ||
5314 | list = &ctx->cancel_hash[hash_long(req->user_data, ctx->cancel_hash_bits)]; | |
5315 | hlist_add_head(&req->hash_node, list); | |
5316 | } | |
5317 | ||
5318 | static __poll_t __io_arm_poll_handler(struct io_kiocb *req, | |
5319 | struct io_poll_iocb *poll, | |
5320 | struct io_poll_table *ipt, __poll_t mask, | |
5321 | wait_queue_func_t wake_func) | |
5322 | __acquires(&ctx->completion_lock) | |
5323 | { | |
5324 | struct io_ring_ctx *ctx = req->ctx; | |
5325 | bool cancel = false; | |
5326 | ||
4d52f338 | 5327 | INIT_HLIST_NODE(&req->hash_node); |
18bceab1 | 5328 | io_init_poll_iocb(poll, mask, wake_func); |
b90cd197 | 5329 | poll->file = req->file; |
18bceab1 | 5330 | poll->wait.private = req; |
d7718a9d JA |
5331 | |
5332 | ipt->pt._key = mask; | |
5333 | ipt->req = req; | |
5334 | ipt->error = -EINVAL; | |
5335 | ||
d7718a9d JA |
5336 | mask = vfs_poll(req->file, &ipt->pt) & poll->events; |
5337 | ||
5338 | spin_lock_irq(&ctx->completion_lock); | |
5339 | if (likely(poll->head)) { | |
5340 | spin_lock(&poll->head->lock); | |
5341 | if (unlikely(list_empty(&poll->wait.entry))) { | |
5342 | if (ipt->error) | |
5343 | cancel = true; | |
5344 | ipt->error = 0; | |
5345 | mask = 0; | |
5346 | } | |
5347 | if (mask || ipt->error) | |
5348 | list_del_init(&poll->wait.entry); | |
5349 | else if (cancel) | |
5350 | WRITE_ONCE(poll->canceled, true); | |
5351 | else if (!poll->done) /* actually waiting for an event */ | |
5352 | io_poll_req_insert(req); | |
5353 | spin_unlock(&poll->head->lock); | |
5354 | } | |
5355 | ||
5356 | return mask; | |
5357 | } | |
5358 | ||
5359 | static bool io_arm_poll_handler(struct io_kiocb *req) | |
5360 | { | |
5361 | const struct io_op_def *def = &io_op_defs[req->opcode]; | |
5362 | struct io_ring_ctx *ctx = req->ctx; | |
5363 | struct async_poll *apoll; | |
5364 | struct io_poll_table ipt; | |
5365 | __poll_t mask, ret; | |
9dab14b8 | 5366 | int rw; |
d7718a9d JA |
5367 | |
5368 | if (!req->file || !file_can_poll(req->file)) | |
5369 | return false; | |
24c74678 | 5370 | if (req->flags & REQ_F_POLLED) |
d7718a9d | 5371 | return false; |
9dab14b8 JA |
5372 | if (def->pollin) |
5373 | rw = READ; | |
5374 | else if (def->pollout) | |
5375 | rw = WRITE; | |
5376 | else | |
5377 | return false; | |
5378 | /* if we can't nonblock try, then no point in arming a poll handler */ | |
5379 | if (!io_file_supports_async(req->file, rw)) | |
d7718a9d JA |
5380 | return false; |
5381 | ||
5382 | apoll = kmalloc(sizeof(*apoll), GFP_ATOMIC); | |
5383 | if (unlikely(!apoll)) | |
5384 | return false; | |
807abcb0 | 5385 | apoll->double_poll = NULL; |
d7718a9d JA |
5386 | |
5387 | req->flags |= REQ_F_POLLED; | |
d7718a9d | 5388 | req->apoll = apoll; |
d7718a9d | 5389 | |
8755d97a | 5390 | mask = 0; |
d7718a9d | 5391 | if (def->pollin) |
8755d97a | 5392 | mask |= POLLIN | POLLRDNORM; |
d7718a9d JA |
5393 | if (def->pollout) |
5394 | mask |= POLLOUT | POLLWRNORM; | |
901341bb LH |
5395 | |
5396 | /* If reading from MSG_ERRQUEUE using recvmsg, ignore POLLIN */ | |
5397 | if ((req->opcode == IORING_OP_RECVMSG) && | |
5398 | (req->sr_msg.msg_flags & MSG_ERRQUEUE)) | |
5399 | mask &= ~POLLIN; | |
5400 | ||
d7718a9d JA |
5401 | mask |= POLLERR | POLLPRI; |
5402 | ||
5403 | ipt.pt._qproc = io_async_queue_proc; | |
5404 | ||
5405 | ret = __io_arm_poll_handler(req, &apoll->poll, &ipt, mask, | |
5406 | io_async_wake); | |
a36da65c | 5407 | if (ret || ipt.error) { |
d4e7cd36 | 5408 | io_poll_remove_double(req); |
d7718a9d | 5409 | spin_unlock_irq(&ctx->completion_lock); |
807abcb0 | 5410 | kfree(apoll->double_poll); |
d7718a9d JA |
5411 | kfree(apoll); |
5412 | return false; | |
5413 | } | |
5414 | spin_unlock_irq(&ctx->completion_lock); | |
5415 | trace_io_uring_poll_arm(ctx, req->opcode, req->user_data, mask, | |
5416 | apoll->poll.events); | |
5417 | return true; | |
5418 | } | |
5419 | ||
5420 | static bool __io_poll_remove_one(struct io_kiocb *req, | |
5421 | struct io_poll_iocb *poll) | |
221c5eb2 | 5422 | { |
b41e9852 | 5423 | bool do_complete = false; |
221c5eb2 JA |
5424 | |
5425 | spin_lock(&poll->head->lock); | |
5426 | WRITE_ONCE(poll->canceled, true); | |
392edb45 JA |
5427 | if (!list_empty(&poll->wait.entry)) { |
5428 | list_del_init(&poll->wait.entry); | |
b41e9852 | 5429 | do_complete = true; |
221c5eb2 JA |
5430 | } |
5431 | spin_unlock(&poll->head->lock); | |
3bfa5bcb | 5432 | hash_del(&req->hash_node); |
d7718a9d JA |
5433 | return do_complete; |
5434 | } | |
5435 | ||
5436 | static bool io_poll_remove_one(struct io_kiocb *req) | |
5437 | { | |
5438 | bool do_complete; | |
5439 | ||
d4e7cd36 JA |
5440 | io_poll_remove_double(req); |
5441 | ||
d7718a9d JA |
5442 | if (req->opcode == IORING_OP_POLL_ADD) { |
5443 | do_complete = __io_poll_remove_one(req, &req->poll); | |
5444 | } else { | |
3bfa5bcb JA |
5445 | struct async_poll *apoll = req->apoll; |
5446 | ||
d7718a9d | 5447 | /* non-poll requests have submit ref still */ |
3bfa5bcb JA |
5448 | do_complete = __io_poll_remove_one(req, &apoll->poll); |
5449 | if (do_complete) { | |
d7718a9d | 5450 | io_put_req(req); |
807abcb0 | 5451 | kfree(apoll->double_poll); |
3bfa5bcb JA |
5452 | kfree(apoll); |
5453 | } | |
b1f573bd XW |
5454 | } |
5455 | ||
b41e9852 JA |
5456 | if (do_complete) { |
5457 | io_cqring_fill_event(req, -ECANCELED); | |
5458 | io_commit_cqring(req->ctx); | |
f254ac04 | 5459 | req_set_fail_links(req); |
216578e5 | 5460 | io_put_req_deferred(req, 1); |
b41e9852 JA |
5461 | } |
5462 | ||
5463 | return do_complete; | |
221c5eb2 JA |
5464 | } |
5465 | ||
76e1b642 JA |
5466 | /* |
5467 | * Returns true if we found and killed one or more poll requests | |
5468 | */ | |
6b81928d PB |
5469 | static bool io_poll_remove_all(struct io_ring_ctx *ctx, struct task_struct *tsk, |
5470 | struct files_struct *files) | |
221c5eb2 | 5471 | { |
78076bb6 | 5472 | struct hlist_node *tmp; |
221c5eb2 | 5473 | struct io_kiocb *req; |
8e2e1faf | 5474 | int posted = 0, i; |
221c5eb2 JA |
5475 | |
5476 | spin_lock_irq(&ctx->completion_lock); | |
78076bb6 JA |
5477 | for (i = 0; i < (1U << ctx->cancel_hash_bits); i++) { |
5478 | struct hlist_head *list; | |
5479 | ||
5480 | list = &ctx->cancel_hash[i]; | |
f3606e3a | 5481 | hlist_for_each_entry_safe(req, tmp, list, hash_node) { |
6b81928d | 5482 | if (io_match_task(req, tsk, files)) |
f3606e3a JA |
5483 | posted += io_poll_remove_one(req); |
5484 | } | |
221c5eb2 JA |
5485 | } |
5486 | spin_unlock_irq(&ctx->completion_lock); | |
b41e9852 | 5487 | |
8e2e1faf JA |
5488 | if (posted) |
5489 | io_cqring_ev_posted(ctx); | |
76e1b642 JA |
5490 | |
5491 | return posted != 0; | |
221c5eb2 JA |
5492 | } |
5493 | ||
47f46768 JA |
5494 | static int io_poll_cancel(struct io_ring_ctx *ctx, __u64 sqe_addr) |
5495 | { | |
78076bb6 | 5496 | struct hlist_head *list; |
47f46768 JA |
5497 | struct io_kiocb *req; |
5498 | ||
78076bb6 JA |
5499 | list = &ctx->cancel_hash[hash_long(sqe_addr, ctx->cancel_hash_bits)]; |
5500 | hlist_for_each_entry(req, list, hash_node) { | |
b41e9852 JA |
5501 | if (sqe_addr != req->user_data) |
5502 | continue; | |
5503 | if (io_poll_remove_one(req)) | |
eac406c6 | 5504 | return 0; |
b41e9852 | 5505 | return -EALREADY; |
47f46768 JA |
5506 | } |
5507 | ||
5508 | return -ENOENT; | |
5509 | } | |
5510 | ||
3529d8c2 JA |
5511 | static int io_poll_remove_prep(struct io_kiocb *req, |
5512 | const struct io_uring_sqe *sqe) | |
0969e783 | 5513 | { |
0969e783 JA |
5514 | if (unlikely(req->ctx->flags & IORING_SETUP_IOPOLL)) |
5515 | return -EINVAL; | |
5516 | if (sqe->ioprio || sqe->off || sqe->len || sqe->buf_index || | |
5517 | sqe->poll_events) | |
5518 | return -EINVAL; | |
5519 | ||
018043be | 5520 | req->poll_remove.addr = READ_ONCE(sqe->addr); |
0969e783 JA |
5521 | return 0; |
5522 | } | |
5523 | ||
221c5eb2 JA |
5524 | /* |
5525 | * Find a running poll command that matches one specified in sqe->addr, | |
5526 | * and remove it if found. | |
5527 | */ | |
fc4df999 | 5528 | static int io_poll_remove(struct io_kiocb *req) |
221c5eb2 JA |
5529 | { |
5530 | struct io_ring_ctx *ctx = req->ctx; | |
47f46768 | 5531 | int ret; |
221c5eb2 | 5532 | |
221c5eb2 | 5533 | spin_lock_irq(&ctx->completion_lock); |
018043be | 5534 | ret = io_poll_cancel(ctx, req->poll_remove.addr); |
221c5eb2 JA |
5535 | spin_unlock_irq(&ctx->completion_lock); |
5536 | ||
4e88d6e7 JA |
5537 | if (ret < 0) |
5538 | req_set_fail_links(req); | |
e1e16097 | 5539 | io_req_complete(req, ret); |
221c5eb2 JA |
5540 | return 0; |
5541 | } | |
5542 | ||
221c5eb2 JA |
5543 | static int io_poll_wake(struct wait_queue_entry *wait, unsigned mode, int sync, |
5544 | void *key) | |
5545 | { | |
c2f2eb7d JA |
5546 | struct io_kiocb *req = wait->private; |
5547 | struct io_poll_iocb *poll = &req->poll; | |
221c5eb2 | 5548 | |
d7718a9d | 5549 | return __io_async_wake(req, poll, key_to_poll(key), io_poll_task_func); |
221c5eb2 JA |
5550 | } |
5551 | ||
221c5eb2 JA |
5552 | static void io_poll_queue_proc(struct file *file, struct wait_queue_head *head, |
5553 | struct poll_table_struct *p) | |
5554 | { | |
5555 | struct io_poll_table *pt = container_of(p, struct io_poll_table, pt); | |
5556 | ||
e8c2bc1f | 5557 | __io_queue_proc(&pt->req->poll, pt, head, (struct io_poll_iocb **) &pt->req->async_data); |
eac406c6 JA |
5558 | } |
5559 | ||
3529d8c2 | 5560 | static int io_poll_add_prep(struct io_kiocb *req, const struct io_uring_sqe *sqe) |
221c5eb2 JA |
5561 | { |
5562 | struct io_poll_iocb *poll = &req->poll; | |
5769a351 | 5563 | u32 events; |
221c5eb2 JA |
5564 | |
5565 | if (unlikely(req->ctx->flags & IORING_SETUP_IOPOLL)) | |
5566 | return -EINVAL; | |
5567 | if (sqe->addr || sqe->ioprio || sqe->off || sqe->len || sqe->buf_index) | |
5568 | return -EINVAL; | |
5569 | ||
5769a351 JX |
5570 | events = READ_ONCE(sqe->poll32_events); |
5571 | #ifdef __BIG_ENDIAN | |
5572 | events = swahw32(events); | |
5573 | #endif | |
a31eb4a2 JX |
5574 | poll->events = demangle_poll(events) | EPOLLERR | EPOLLHUP | |
5575 | (events & EPOLLEXCLUSIVE); | |
0969e783 JA |
5576 | return 0; |
5577 | } | |
5578 | ||
014db007 | 5579 | static int io_poll_add(struct io_kiocb *req) |
0969e783 JA |
5580 | { |
5581 | struct io_poll_iocb *poll = &req->poll; | |
5582 | struct io_ring_ctx *ctx = req->ctx; | |
5583 | struct io_poll_table ipt; | |
0969e783 | 5584 | __poll_t mask; |
0969e783 | 5585 | |
d7718a9d | 5586 | ipt.pt._qproc = io_poll_queue_proc; |
36703247 | 5587 | |
d7718a9d JA |
5588 | mask = __io_arm_poll_handler(req, &req->poll, &ipt, poll->events, |
5589 | io_poll_wake); | |
221c5eb2 | 5590 | |
8c838788 | 5591 | if (mask) { /* no async, we'd stolen it */ |
221c5eb2 | 5592 | ipt.error = 0; |
b0dd8a41 | 5593 | io_poll_complete(req, mask, 0); |
221c5eb2 | 5594 | } |
221c5eb2 JA |
5595 | spin_unlock_irq(&ctx->completion_lock); |
5596 | ||
8c838788 JA |
5597 | if (mask) { |
5598 | io_cqring_ev_posted(ctx); | |
014db007 | 5599 | io_put_req(req); |
221c5eb2 | 5600 | } |
8c838788 | 5601 | return ipt.error; |
221c5eb2 JA |
5602 | } |
5603 | ||
5262f567 JA |
5604 | static enum hrtimer_restart io_timeout_fn(struct hrtimer *timer) |
5605 | { | |
ad8a48ac JA |
5606 | struct io_timeout_data *data = container_of(timer, |
5607 | struct io_timeout_data, timer); | |
5608 | struct io_kiocb *req = data->req; | |
5609 | struct io_ring_ctx *ctx = req->ctx; | |
5262f567 JA |
5610 | unsigned long flags; |
5611 | ||
5262f567 | 5612 | spin_lock_irqsave(&ctx->completion_lock, flags); |
a71976f3 | 5613 | list_del_init(&req->timeout.list); |
01cec8c1 PB |
5614 | atomic_set(&req->ctx->cq_timeouts, |
5615 | atomic_read(&req->ctx->cq_timeouts) + 1); | |
5616 | ||
78e19bbe | 5617 | io_cqring_fill_event(req, -ETIME); |
5262f567 JA |
5618 | io_commit_cqring(ctx); |
5619 | spin_unlock_irqrestore(&ctx->completion_lock, flags); | |
5620 | ||
5621 | io_cqring_ev_posted(ctx); | |
4e88d6e7 | 5622 | req_set_fail_links(req); |
5262f567 JA |
5623 | io_put_req(req); |
5624 | return HRTIMER_NORESTART; | |
5625 | } | |
5626 | ||
f254ac04 JA |
5627 | static int __io_timeout_cancel(struct io_kiocb *req) |
5628 | { | |
e8c2bc1f | 5629 | struct io_timeout_data *io = req->async_data; |
f254ac04 JA |
5630 | int ret; |
5631 | ||
e8c2bc1f | 5632 | ret = hrtimer_try_to_cancel(&io->timer); |
f254ac04 JA |
5633 | if (ret == -1) |
5634 | return -EALREADY; | |
a71976f3 | 5635 | list_del_init(&req->timeout.list); |
f254ac04 JA |
5636 | |
5637 | req_set_fail_links(req); | |
f254ac04 | 5638 | io_cqring_fill_event(req, -ECANCELED); |
216578e5 | 5639 | io_put_req_deferred(req, 1); |
f254ac04 JA |
5640 | return 0; |
5641 | } | |
5642 | ||
47f46768 JA |
5643 | static int io_timeout_cancel(struct io_ring_ctx *ctx, __u64 user_data) |
5644 | { | |
5645 | struct io_kiocb *req; | |
5646 | int ret = -ENOENT; | |
5647 | ||
135fcde8 | 5648 | list_for_each_entry(req, &ctx->timeout_list, timeout.list) { |
47f46768 | 5649 | if (user_data == req->user_data) { |
47f46768 JA |
5650 | ret = 0; |
5651 | break; | |
5652 | } | |
5653 | } | |
5654 | ||
5655 | if (ret == -ENOENT) | |
5656 | return ret; | |
5657 | ||
f254ac04 | 5658 | return __io_timeout_cancel(req); |
47f46768 JA |
5659 | } |
5660 | ||
3529d8c2 JA |
5661 | static int io_timeout_remove_prep(struct io_kiocb *req, |
5662 | const struct io_uring_sqe *sqe) | |
b29472ee | 5663 | { |
b29472ee JA |
5664 | if (unlikely(req->ctx->flags & IORING_SETUP_IOPOLL)) |
5665 | return -EINVAL; | |
61710e43 DA |
5666 | if (unlikely(req->flags & (REQ_F_FIXED_FILE | REQ_F_BUFFER_SELECT))) |
5667 | return -EINVAL; | |
0bdf7a2d | 5668 | if (sqe->ioprio || sqe->buf_index || sqe->len || sqe->timeout_flags) |
b29472ee JA |
5669 | return -EINVAL; |
5670 | ||
0bdf7a2d | 5671 | req->timeout_rem.addr = READ_ONCE(sqe->addr); |
b29472ee JA |
5672 | return 0; |
5673 | } | |
5674 | ||
11365043 JA |
5675 | /* |
5676 | * Remove or update an existing timeout command | |
5677 | */ | |
fc4df999 | 5678 | static int io_timeout_remove(struct io_kiocb *req) |
11365043 JA |
5679 | { |
5680 | struct io_ring_ctx *ctx = req->ctx; | |
47f46768 | 5681 | int ret; |
11365043 | 5682 | |
11365043 | 5683 | spin_lock_irq(&ctx->completion_lock); |
0bdf7a2d | 5684 | ret = io_timeout_cancel(ctx, req->timeout_rem.addr); |
11365043 | 5685 | |
47f46768 | 5686 | io_cqring_fill_event(req, ret); |
11365043 JA |
5687 | io_commit_cqring(ctx); |
5688 | spin_unlock_irq(&ctx->completion_lock); | |
5262f567 | 5689 | io_cqring_ev_posted(ctx); |
4e88d6e7 JA |
5690 | if (ret < 0) |
5691 | req_set_fail_links(req); | |
ec9c02ad | 5692 | io_put_req(req); |
11365043 | 5693 | return 0; |
5262f567 JA |
5694 | } |
5695 | ||
3529d8c2 | 5696 | static int io_timeout_prep(struct io_kiocb *req, const struct io_uring_sqe *sqe, |
2d28390a | 5697 | bool is_timeout_link) |
5262f567 | 5698 | { |
ad8a48ac | 5699 | struct io_timeout_data *data; |
a41525ab | 5700 | unsigned flags; |
56080b02 | 5701 | u32 off = READ_ONCE(sqe->off); |
5262f567 | 5702 | |
ad8a48ac | 5703 | if (unlikely(req->ctx->flags & IORING_SETUP_IOPOLL)) |
5262f567 | 5704 | return -EINVAL; |
ad8a48ac | 5705 | if (sqe->ioprio || sqe->buf_index || sqe->len != 1) |
a41525ab | 5706 | return -EINVAL; |
56080b02 | 5707 | if (off && is_timeout_link) |
2d28390a | 5708 | return -EINVAL; |
a41525ab JA |
5709 | flags = READ_ONCE(sqe->timeout_flags); |
5710 | if (flags & ~IORING_TIMEOUT_ABS) | |
5262f567 | 5711 | return -EINVAL; |
bdf20073 | 5712 | |
bfe68a22 | 5713 | req->timeout.off = off; |
26a61679 | 5714 | |
e8c2bc1f | 5715 | if (!req->async_data && io_alloc_async_data(req)) |
26a61679 JA |
5716 | return -ENOMEM; |
5717 | ||
e8c2bc1f | 5718 | data = req->async_data; |
ad8a48ac | 5719 | data->req = req; |
ad8a48ac JA |
5720 | |
5721 | if (get_timespec64(&data->ts, u64_to_user_ptr(sqe->addr))) | |
5262f567 JA |
5722 | return -EFAULT; |
5723 | ||
11365043 | 5724 | if (flags & IORING_TIMEOUT_ABS) |
ad8a48ac | 5725 | data->mode = HRTIMER_MODE_ABS; |
11365043 | 5726 | else |
ad8a48ac | 5727 | data->mode = HRTIMER_MODE_REL; |
11365043 | 5728 | |
ad8a48ac JA |
5729 | hrtimer_init(&data->timer, CLOCK_MONOTONIC, data->mode); |
5730 | return 0; | |
5731 | } | |
5732 | ||
fc4df999 | 5733 | static int io_timeout(struct io_kiocb *req) |
ad8a48ac | 5734 | { |
ad8a48ac | 5735 | struct io_ring_ctx *ctx = req->ctx; |
e8c2bc1f | 5736 | struct io_timeout_data *data = req->async_data; |
ad8a48ac | 5737 | struct list_head *entry; |
bfe68a22 | 5738 | u32 tail, off = req->timeout.off; |
ad8a48ac | 5739 | |
733f5c95 | 5740 | spin_lock_irq(&ctx->completion_lock); |
93bd25bb | 5741 | |
5262f567 JA |
5742 | /* |
5743 | * sqe->off holds how many events that need to occur for this | |
93bd25bb JA |
5744 | * timeout event to be satisfied. If it isn't set, then this is |
5745 | * a pure timeout request, sequence isn't used. | |
5262f567 | 5746 | */ |
8eb7e2d0 | 5747 | if (io_is_timeout_noseq(req)) { |
93bd25bb JA |
5748 | entry = ctx->timeout_list.prev; |
5749 | goto add; | |
5750 | } | |
5262f567 | 5751 | |
bfe68a22 PB |
5752 | tail = ctx->cached_cq_tail - atomic_read(&ctx->cq_timeouts); |
5753 | req->timeout.target_seq = tail + off; | |
5262f567 JA |
5754 | |
5755 | /* | |
5756 | * Insertion sort, ensuring the first entry in the list is always | |
5757 | * the one we need first. | |
5758 | */ | |
5262f567 | 5759 | list_for_each_prev(entry, &ctx->timeout_list) { |
135fcde8 PB |
5760 | struct io_kiocb *nxt = list_entry(entry, struct io_kiocb, |
5761 | timeout.list); | |
5262f567 | 5762 | |
8eb7e2d0 | 5763 | if (io_is_timeout_noseq(nxt)) |
93bd25bb | 5764 | continue; |
bfe68a22 PB |
5765 | /* nxt.seq is behind @tail, otherwise would've been completed */ |
5766 | if (off >= nxt->timeout.target_seq - tail) | |
5262f567 JA |
5767 | break; |
5768 | } | |
93bd25bb | 5769 | add: |
135fcde8 | 5770 | list_add(&req->timeout.list, entry); |
ad8a48ac JA |
5771 | data->timer.function = io_timeout_fn; |
5772 | hrtimer_start(&data->timer, timespec64_to_ktime(data->ts), data->mode); | |
5262f567 | 5773 | spin_unlock_irq(&ctx->completion_lock); |
5262f567 JA |
5774 | return 0; |
5775 | } | |
5262f567 | 5776 | |
62755e35 JA |
5777 | static bool io_cancel_cb(struct io_wq_work *work, void *data) |
5778 | { | |
5779 | struct io_kiocb *req = container_of(work, struct io_kiocb, work); | |
5780 | ||
5781 | return req->user_data == (unsigned long) data; | |
5782 | } | |
5783 | ||
e977d6d3 | 5784 | static int io_async_cancel_one(struct io_ring_ctx *ctx, void *sqe_addr) |
62755e35 | 5785 | { |
62755e35 | 5786 | enum io_wq_cancel cancel_ret; |
62755e35 JA |
5787 | int ret = 0; |
5788 | ||
4f26bda1 | 5789 | cancel_ret = io_wq_cancel_cb(ctx->io_wq, io_cancel_cb, sqe_addr, false); |
62755e35 JA |
5790 | switch (cancel_ret) { |
5791 | case IO_WQ_CANCEL_OK: | |
5792 | ret = 0; | |
5793 | break; | |
5794 | case IO_WQ_CANCEL_RUNNING: | |
5795 | ret = -EALREADY; | |
5796 | break; | |
5797 | case IO_WQ_CANCEL_NOTFOUND: | |
5798 | ret = -ENOENT; | |
5799 | break; | |
5800 | } | |
5801 | ||
e977d6d3 JA |
5802 | return ret; |
5803 | } | |
5804 | ||
47f46768 JA |
5805 | static void io_async_find_and_cancel(struct io_ring_ctx *ctx, |
5806 | struct io_kiocb *req, __u64 sqe_addr, | |
014db007 | 5807 | int success_ret) |
47f46768 JA |
5808 | { |
5809 | unsigned long flags; | |
5810 | int ret; | |
5811 | ||
5812 | ret = io_async_cancel_one(ctx, (void *) (unsigned long) sqe_addr); | |
5813 | if (ret != -ENOENT) { | |
5814 | spin_lock_irqsave(&ctx->completion_lock, flags); | |
5815 | goto done; | |
5816 | } | |
5817 | ||
5818 | spin_lock_irqsave(&ctx->completion_lock, flags); | |
5819 | ret = io_timeout_cancel(ctx, sqe_addr); | |
5820 | if (ret != -ENOENT) | |
5821 | goto done; | |
5822 | ret = io_poll_cancel(ctx, sqe_addr); | |
5823 | done: | |
b0dd8a41 JA |
5824 | if (!ret) |
5825 | ret = success_ret; | |
47f46768 JA |
5826 | io_cqring_fill_event(req, ret); |
5827 | io_commit_cqring(ctx); | |
5828 | spin_unlock_irqrestore(&ctx->completion_lock, flags); | |
5829 | io_cqring_ev_posted(ctx); | |
5830 | ||
4e88d6e7 JA |
5831 | if (ret < 0) |
5832 | req_set_fail_links(req); | |
014db007 | 5833 | io_put_req(req); |
47f46768 JA |
5834 | } |
5835 | ||
3529d8c2 JA |
5836 | static int io_async_cancel_prep(struct io_kiocb *req, |
5837 | const struct io_uring_sqe *sqe) | |
e977d6d3 | 5838 | { |
fbf23849 | 5839 | if (unlikely(req->ctx->flags & IORING_SETUP_IOPOLL)) |
e977d6d3 | 5840 | return -EINVAL; |
61710e43 DA |
5841 | if (unlikely(req->flags & (REQ_F_FIXED_FILE | REQ_F_BUFFER_SELECT))) |
5842 | return -EINVAL; | |
5843 | if (sqe->ioprio || sqe->off || sqe->len || sqe->cancel_flags) | |
e977d6d3 JA |
5844 | return -EINVAL; |
5845 | ||
fbf23849 JA |
5846 | req->cancel.addr = READ_ONCE(sqe->addr); |
5847 | return 0; | |
5848 | } | |
5849 | ||
014db007 | 5850 | static int io_async_cancel(struct io_kiocb *req) |
fbf23849 JA |
5851 | { |
5852 | struct io_ring_ctx *ctx = req->ctx; | |
fbf23849 | 5853 | |
014db007 | 5854 | io_async_find_and_cancel(ctx, req, req->cancel.addr, 0); |
5262f567 JA |
5855 | return 0; |
5856 | } | |
5857 | ||
05f3fb3c JA |
5858 | static int io_files_update_prep(struct io_kiocb *req, |
5859 | const struct io_uring_sqe *sqe) | |
5860 | { | |
6ca56f84 JA |
5861 | if (unlikely(req->ctx->flags & IORING_SETUP_SQPOLL)) |
5862 | return -EINVAL; | |
61710e43 DA |
5863 | if (unlikely(req->flags & (REQ_F_FIXED_FILE | REQ_F_BUFFER_SELECT))) |
5864 | return -EINVAL; | |
5865 | if (sqe->ioprio || sqe->rw_flags) | |
05f3fb3c JA |
5866 | return -EINVAL; |
5867 | ||
5868 | req->files_update.offset = READ_ONCE(sqe->off); | |
5869 | req->files_update.nr_args = READ_ONCE(sqe->len); | |
5870 | if (!req->files_update.nr_args) | |
5871 | return -EINVAL; | |
5872 | req->files_update.arg = READ_ONCE(sqe->addr); | |
5873 | return 0; | |
5874 | } | |
5875 | ||
229a7b63 JA |
5876 | static int io_files_update(struct io_kiocb *req, bool force_nonblock, |
5877 | struct io_comp_state *cs) | |
fbf23849 JA |
5878 | { |
5879 | struct io_ring_ctx *ctx = req->ctx; | |
05f3fb3c JA |
5880 | struct io_uring_files_update up; |
5881 | int ret; | |
fbf23849 | 5882 | |
f86cd20c | 5883 | if (force_nonblock) |
05f3fb3c | 5884 | return -EAGAIN; |
05f3fb3c JA |
5885 | |
5886 | up.offset = req->files_update.offset; | |
5887 | up.fds = req->files_update.arg; | |
5888 | ||
5889 | mutex_lock(&ctx->uring_lock); | |
5890 | ret = __io_sqe_files_update(ctx, &up, req->files_update.nr_args); | |
5891 | mutex_unlock(&ctx->uring_lock); | |
5892 | ||
5893 | if (ret < 0) | |
5894 | req_set_fail_links(req); | |
229a7b63 | 5895 | __io_req_complete(req, ret, 0, cs); |
5262f567 JA |
5896 | return 0; |
5897 | } | |
5898 | ||
bfe76559 | 5899 | static int io_req_prep(struct io_kiocb *req, const struct io_uring_sqe *sqe) |
f67676d1 | 5900 | { |
d625c6ee | 5901 | switch (req->opcode) { |
e781573e | 5902 | case IORING_OP_NOP: |
bfe76559 | 5903 | return 0; |
f67676d1 JA |
5904 | case IORING_OP_READV: |
5905 | case IORING_OP_READ_FIXED: | |
3a6820f2 | 5906 | case IORING_OP_READ: |
bfe76559 | 5907 | return io_read_prep(req, sqe); |
f67676d1 JA |
5908 | case IORING_OP_WRITEV: |
5909 | case IORING_OP_WRITE_FIXED: | |
3a6820f2 | 5910 | case IORING_OP_WRITE: |
bfe76559 | 5911 | return io_write_prep(req, sqe); |
0969e783 | 5912 | case IORING_OP_POLL_ADD: |
bfe76559 | 5913 | return io_poll_add_prep(req, sqe); |
0969e783 | 5914 | case IORING_OP_POLL_REMOVE: |
bfe76559 | 5915 | return io_poll_remove_prep(req, sqe); |
8ed8d3c3 | 5916 | case IORING_OP_FSYNC: |
bfe76559 | 5917 | return io_prep_fsync(req, sqe); |
8ed8d3c3 | 5918 | case IORING_OP_SYNC_FILE_RANGE: |
bfe76559 | 5919 | return io_prep_sfr(req, sqe); |
03b1230c | 5920 | case IORING_OP_SENDMSG: |
fddaface | 5921 | case IORING_OP_SEND: |
bfe76559 | 5922 | return io_sendmsg_prep(req, sqe); |
03b1230c | 5923 | case IORING_OP_RECVMSG: |
fddaface | 5924 | case IORING_OP_RECV: |
bfe76559 | 5925 | return io_recvmsg_prep(req, sqe); |
f499a021 | 5926 | case IORING_OP_CONNECT: |
bfe76559 | 5927 | return io_connect_prep(req, sqe); |
2d28390a | 5928 | case IORING_OP_TIMEOUT: |
bfe76559 | 5929 | return io_timeout_prep(req, sqe, false); |
b29472ee | 5930 | case IORING_OP_TIMEOUT_REMOVE: |
bfe76559 | 5931 | return io_timeout_remove_prep(req, sqe); |
fbf23849 | 5932 | case IORING_OP_ASYNC_CANCEL: |
bfe76559 | 5933 | return io_async_cancel_prep(req, sqe); |
2d28390a | 5934 | case IORING_OP_LINK_TIMEOUT: |
bfe76559 | 5935 | return io_timeout_prep(req, sqe, true); |
8ed8d3c3 | 5936 | case IORING_OP_ACCEPT: |
bfe76559 | 5937 | return io_accept_prep(req, sqe); |
d63d1b5e | 5938 | case IORING_OP_FALLOCATE: |
bfe76559 | 5939 | return io_fallocate_prep(req, sqe); |
15b71abe | 5940 | case IORING_OP_OPENAT: |
bfe76559 | 5941 | return io_openat_prep(req, sqe); |
b5dba59e | 5942 | case IORING_OP_CLOSE: |
bfe76559 | 5943 | return io_close_prep(req, sqe); |
05f3fb3c | 5944 | case IORING_OP_FILES_UPDATE: |
bfe76559 | 5945 | return io_files_update_prep(req, sqe); |
eddc7ef5 | 5946 | case IORING_OP_STATX: |
bfe76559 | 5947 | return io_statx_prep(req, sqe); |
4840e418 | 5948 | case IORING_OP_FADVISE: |
bfe76559 | 5949 | return io_fadvise_prep(req, sqe); |
c1ca757b | 5950 | case IORING_OP_MADVISE: |
bfe76559 | 5951 | return io_madvise_prep(req, sqe); |
cebdb986 | 5952 | case IORING_OP_OPENAT2: |
bfe76559 | 5953 | return io_openat2_prep(req, sqe); |
3e4827b0 | 5954 | case IORING_OP_EPOLL_CTL: |
bfe76559 | 5955 | return io_epoll_ctl_prep(req, sqe); |
7d67af2c | 5956 | case IORING_OP_SPLICE: |
bfe76559 | 5957 | return io_splice_prep(req, sqe); |
ddf0322d | 5958 | case IORING_OP_PROVIDE_BUFFERS: |
bfe76559 | 5959 | return io_provide_buffers_prep(req, sqe); |
067524e9 | 5960 | case IORING_OP_REMOVE_BUFFERS: |
bfe76559 | 5961 | return io_remove_buffers_prep(req, sqe); |
f2a8d5c7 | 5962 | case IORING_OP_TEE: |
bfe76559 | 5963 | return io_tee_prep(req, sqe); |
36f4fa68 JA |
5964 | case IORING_OP_SHUTDOWN: |
5965 | return io_shutdown_prep(req, sqe); | |
80a261fd JA |
5966 | case IORING_OP_RENAMEAT: |
5967 | return io_renameat_prep(req, sqe); | |
14a1143b JA |
5968 | case IORING_OP_UNLINKAT: |
5969 | return io_unlinkat_prep(req, sqe); | |
f67676d1 JA |
5970 | } |
5971 | ||
bfe76559 PB |
5972 | printk_once(KERN_WARNING "io_uring: unhandled opcode %d\n", |
5973 | req->opcode); | |
5974 | return-EINVAL; | |
5975 | } | |
5976 | ||
5977 | static int io_req_defer_prep(struct io_kiocb *req, | |
5978 | const struct io_uring_sqe *sqe) | |
5979 | { | |
bfe76559 PB |
5980 | if (!sqe) |
5981 | return 0; | |
5982 | if (io_alloc_async_data(req)) | |
5983 | return -EAGAIN; | |
bfe76559 | 5984 | return io_req_prep(req, sqe); |
f67676d1 JA |
5985 | } |
5986 | ||
9cf7c104 PB |
5987 | static u32 io_get_sequence(struct io_kiocb *req) |
5988 | { | |
5989 | struct io_kiocb *pos; | |
5990 | struct io_ring_ctx *ctx = req->ctx; | |
f2f87370 | 5991 | u32 total_submitted, nr_reqs = 0; |
9cf7c104 | 5992 | |
f2f87370 PB |
5993 | io_for_each_link(pos, req) |
5994 | nr_reqs++; | |
9cf7c104 PB |
5995 | |
5996 | total_submitted = ctx->cached_sq_head - ctx->cached_sq_dropped; | |
5997 | return total_submitted - nr_reqs; | |
5998 | } | |
5999 | ||
3529d8c2 | 6000 | static int io_req_defer(struct io_kiocb *req, const struct io_uring_sqe *sqe) |
de0617e4 | 6001 | { |
a197f664 | 6002 | struct io_ring_ctx *ctx = req->ctx; |
27dc8338 | 6003 | struct io_defer_entry *de; |
f67676d1 | 6004 | int ret; |
9cf7c104 | 6005 | u32 seq; |
de0617e4 | 6006 | |
9d858b21 | 6007 | /* Still need defer if there is pending req in defer list. */ |
9cf7c104 PB |
6008 | if (likely(list_empty_careful(&ctx->defer_list) && |
6009 | !(req->flags & REQ_F_IO_DRAIN))) | |
6010 | return 0; | |
6011 | ||
6012 | seq = io_get_sequence(req); | |
6013 | /* Still a chance to pass the sequence check */ | |
6014 | if (!req_need_defer(req, seq) && list_empty_careful(&ctx->defer_list)) | |
de0617e4 JA |
6015 | return 0; |
6016 | ||
e8c2bc1f | 6017 | if (!req->async_data) { |
650b5481 | 6018 | ret = io_req_defer_prep(req, sqe); |
327d6d96 | 6019 | if (ret) |
650b5481 PB |
6020 | return ret; |
6021 | } | |
cbdcb435 | 6022 | io_prep_async_link(req); |
27dc8338 PB |
6023 | de = kmalloc(sizeof(*de), GFP_KERNEL); |
6024 | if (!de) | |
6025 | return -ENOMEM; | |
2d28390a | 6026 | |
de0617e4 | 6027 | spin_lock_irq(&ctx->completion_lock); |
9cf7c104 | 6028 | if (!req_need_defer(req, seq) && list_empty(&ctx->defer_list)) { |
de0617e4 | 6029 | spin_unlock_irq(&ctx->completion_lock); |
27dc8338 | 6030 | kfree(de); |
ae34817b PB |
6031 | io_queue_async_work(req); |
6032 | return -EIOCBQUEUED; | |
de0617e4 JA |
6033 | } |
6034 | ||
915967f6 | 6035 | trace_io_uring_defer(ctx, req, req->user_data); |
27dc8338 | 6036 | de->req = req; |
9cf7c104 | 6037 | de->seq = seq; |
27dc8338 | 6038 | list_add_tail(&de->list, &ctx->defer_list); |
de0617e4 JA |
6039 | spin_unlock_irq(&ctx->completion_lock); |
6040 | return -EIOCBQUEUED; | |
6041 | } | |
6042 | ||
f573d384 | 6043 | static void io_req_drop_files(struct io_kiocb *req) |
99bc4c38 | 6044 | { |
f573d384 JA |
6045 | struct io_ring_ctx *ctx = req->ctx; |
6046 | unsigned long flags; | |
6047 | ||
6048 | spin_lock_irqsave(&ctx->inflight_lock, flags); | |
6049 | list_del(&req->inflight_entry); | |
6050 | if (waitqueue_active(&ctx->inflight_wait)) | |
6051 | wake_up(&ctx->inflight_wait); | |
6052 | spin_unlock_irqrestore(&ctx->inflight_lock, flags); | |
6053 | req->flags &= ~REQ_F_INFLIGHT; | |
98447d65 JA |
6054 | put_files_struct(req->work.identity->files); |
6055 | put_nsproxy(req->work.identity->nsproxy); | |
dfead8a8 | 6056 | req->work.flags &= ~IO_WQ_WORK_FILES; |
f573d384 | 6057 | } |
99bc4c38 | 6058 | |
3ca405eb | 6059 | static void __io_clean_op(struct io_kiocb *req) |
99bc4c38 | 6060 | { |
0e1b6fe3 PB |
6061 | if (req->flags & REQ_F_BUFFER_SELECTED) { |
6062 | switch (req->opcode) { | |
6063 | case IORING_OP_READV: | |
6064 | case IORING_OP_READ_FIXED: | |
6065 | case IORING_OP_READ: | |
bcda7baa | 6066 | kfree((void *)(unsigned long)req->rw.addr); |
0e1b6fe3 PB |
6067 | break; |
6068 | case IORING_OP_RECVMSG: | |
6069 | case IORING_OP_RECV: | |
bcda7baa | 6070 | kfree(req->sr_msg.kbuf); |
0e1b6fe3 PB |
6071 | break; |
6072 | } | |
6073 | req->flags &= ~REQ_F_BUFFER_SELECTED; | |
99bc4c38 PB |
6074 | } |
6075 | ||
0e1b6fe3 PB |
6076 | if (req->flags & REQ_F_NEED_CLEANUP) { |
6077 | switch (req->opcode) { | |
6078 | case IORING_OP_READV: | |
6079 | case IORING_OP_READ_FIXED: | |
6080 | case IORING_OP_READ: | |
6081 | case IORING_OP_WRITEV: | |
6082 | case IORING_OP_WRITE_FIXED: | |
e8c2bc1f JA |
6083 | case IORING_OP_WRITE: { |
6084 | struct io_async_rw *io = req->async_data; | |
6085 | if (io->free_iovec) | |
6086 | kfree(io->free_iovec); | |
0e1b6fe3 | 6087 | break; |
e8c2bc1f | 6088 | } |
0e1b6fe3 | 6089 | case IORING_OP_RECVMSG: |
e8c2bc1f JA |
6090 | case IORING_OP_SENDMSG: { |
6091 | struct io_async_msghdr *io = req->async_data; | |
6092 | if (io->iov != io->fast_iov) | |
6093 | kfree(io->iov); | |
0e1b6fe3 | 6094 | break; |
e8c2bc1f | 6095 | } |
0e1b6fe3 PB |
6096 | case IORING_OP_SPLICE: |
6097 | case IORING_OP_TEE: | |
6098 | io_put_file(req, req->splice.file_in, | |
6099 | (req->splice.flags & SPLICE_F_FD_IN_FIXED)); | |
6100 | break; | |
f3cd4850 JA |
6101 | case IORING_OP_OPENAT: |
6102 | case IORING_OP_OPENAT2: | |
6103 | if (req->open.filename) | |
6104 | putname(req->open.filename); | |
6105 | break; | |
80a261fd JA |
6106 | case IORING_OP_RENAMEAT: |
6107 | putname(req->rename.oldpath); | |
6108 | putname(req->rename.newpath); | |
6109 | break; | |
14a1143b JA |
6110 | case IORING_OP_UNLINKAT: |
6111 | putname(req->unlink.filename); | |
6112 | break; | |
0e1b6fe3 PB |
6113 | } |
6114 | req->flags &= ~REQ_F_NEED_CLEANUP; | |
99bc4c38 | 6115 | } |
bb175342 | 6116 | |
f573d384 JA |
6117 | if (req->flags & REQ_F_INFLIGHT) |
6118 | io_req_drop_files(req); | |
99bc4c38 PB |
6119 | } |
6120 | ||
c1379e24 PB |
6121 | static int io_issue_sqe(struct io_kiocb *req, bool force_nonblock, |
6122 | struct io_comp_state *cs) | |
2b188cc1 | 6123 | { |
a197f664 | 6124 | struct io_ring_ctx *ctx = req->ctx; |
d625c6ee | 6125 | int ret; |
2b188cc1 | 6126 | |
d625c6ee | 6127 | switch (req->opcode) { |
2b188cc1 | 6128 | case IORING_OP_NOP: |
229a7b63 | 6129 | ret = io_nop(req, cs); |
2b188cc1 JA |
6130 | break; |
6131 | case IORING_OP_READV: | |
edafccee | 6132 | case IORING_OP_READ_FIXED: |
3a6820f2 | 6133 | case IORING_OP_READ: |
a1d7c393 | 6134 | ret = io_read(req, force_nonblock, cs); |
edafccee | 6135 | break; |
3529d8c2 | 6136 | case IORING_OP_WRITEV: |
edafccee | 6137 | case IORING_OP_WRITE_FIXED: |
3a6820f2 | 6138 | case IORING_OP_WRITE: |
a1d7c393 | 6139 | ret = io_write(req, force_nonblock, cs); |
2b188cc1 | 6140 | break; |
c992fe29 | 6141 | case IORING_OP_FSYNC: |
014db007 | 6142 | ret = io_fsync(req, force_nonblock); |
c992fe29 | 6143 | break; |
221c5eb2 | 6144 | case IORING_OP_POLL_ADD: |
014db007 | 6145 | ret = io_poll_add(req); |
221c5eb2 JA |
6146 | break; |
6147 | case IORING_OP_POLL_REMOVE: | |
fc4df999 | 6148 | ret = io_poll_remove(req); |
221c5eb2 | 6149 | break; |
5d17b4a4 | 6150 | case IORING_OP_SYNC_FILE_RANGE: |
014db007 | 6151 | ret = io_sync_file_range(req, force_nonblock); |
5d17b4a4 | 6152 | break; |
0fa03c62 | 6153 | case IORING_OP_SENDMSG: |
062d04d7 PB |
6154 | ret = io_sendmsg(req, force_nonblock, cs); |
6155 | break; | |
fddaface | 6156 | case IORING_OP_SEND: |
062d04d7 | 6157 | ret = io_send(req, force_nonblock, cs); |
0fa03c62 | 6158 | break; |
aa1fa28f | 6159 | case IORING_OP_RECVMSG: |
062d04d7 PB |
6160 | ret = io_recvmsg(req, force_nonblock, cs); |
6161 | break; | |
fddaface | 6162 | case IORING_OP_RECV: |
062d04d7 | 6163 | ret = io_recv(req, force_nonblock, cs); |
aa1fa28f | 6164 | break; |
5262f567 | 6165 | case IORING_OP_TIMEOUT: |
fc4df999 | 6166 | ret = io_timeout(req); |
5262f567 | 6167 | break; |
11365043 | 6168 | case IORING_OP_TIMEOUT_REMOVE: |
fc4df999 | 6169 | ret = io_timeout_remove(req); |
11365043 | 6170 | break; |
17f2fe35 | 6171 | case IORING_OP_ACCEPT: |
229a7b63 | 6172 | ret = io_accept(req, force_nonblock, cs); |
17f2fe35 | 6173 | break; |
f8e85cf2 | 6174 | case IORING_OP_CONNECT: |
229a7b63 | 6175 | ret = io_connect(req, force_nonblock, cs); |
f8e85cf2 | 6176 | break; |
62755e35 | 6177 | case IORING_OP_ASYNC_CANCEL: |
014db007 | 6178 | ret = io_async_cancel(req); |
62755e35 | 6179 | break; |
d63d1b5e | 6180 | case IORING_OP_FALLOCATE: |
014db007 | 6181 | ret = io_fallocate(req, force_nonblock); |
d63d1b5e | 6182 | break; |
15b71abe | 6183 | case IORING_OP_OPENAT: |
014db007 | 6184 | ret = io_openat(req, force_nonblock); |
15b71abe | 6185 | break; |
b5dba59e | 6186 | case IORING_OP_CLOSE: |
229a7b63 | 6187 | ret = io_close(req, force_nonblock, cs); |
b5dba59e | 6188 | break; |
05f3fb3c | 6189 | case IORING_OP_FILES_UPDATE: |
229a7b63 | 6190 | ret = io_files_update(req, force_nonblock, cs); |
05f3fb3c | 6191 | break; |
eddc7ef5 | 6192 | case IORING_OP_STATX: |
014db007 | 6193 | ret = io_statx(req, force_nonblock); |
eddc7ef5 | 6194 | break; |
4840e418 | 6195 | case IORING_OP_FADVISE: |
014db007 | 6196 | ret = io_fadvise(req, force_nonblock); |
4840e418 | 6197 | break; |
c1ca757b | 6198 | case IORING_OP_MADVISE: |
014db007 | 6199 | ret = io_madvise(req, force_nonblock); |
c1ca757b | 6200 | break; |
cebdb986 | 6201 | case IORING_OP_OPENAT2: |
014db007 | 6202 | ret = io_openat2(req, force_nonblock); |
cebdb986 | 6203 | break; |
3e4827b0 | 6204 | case IORING_OP_EPOLL_CTL: |
229a7b63 | 6205 | ret = io_epoll_ctl(req, force_nonblock, cs); |
3e4827b0 | 6206 | break; |
7d67af2c | 6207 | case IORING_OP_SPLICE: |
014db007 | 6208 | ret = io_splice(req, force_nonblock); |
7d67af2c | 6209 | break; |
ddf0322d | 6210 | case IORING_OP_PROVIDE_BUFFERS: |
229a7b63 | 6211 | ret = io_provide_buffers(req, force_nonblock, cs); |
ddf0322d | 6212 | break; |
067524e9 | 6213 | case IORING_OP_REMOVE_BUFFERS: |
229a7b63 | 6214 | ret = io_remove_buffers(req, force_nonblock, cs); |
3e4827b0 | 6215 | break; |
f2a8d5c7 | 6216 | case IORING_OP_TEE: |
f2a8d5c7 PB |
6217 | ret = io_tee(req, force_nonblock); |
6218 | break; | |
36f4fa68 JA |
6219 | case IORING_OP_SHUTDOWN: |
6220 | ret = io_shutdown(req, force_nonblock); | |
6221 | break; | |
80a261fd JA |
6222 | case IORING_OP_RENAMEAT: |
6223 | ret = io_renameat(req, force_nonblock); | |
6224 | break; | |
14a1143b JA |
6225 | case IORING_OP_UNLINKAT: |
6226 | ret = io_unlinkat(req, force_nonblock); | |
6227 | break; | |
2b188cc1 JA |
6228 | default: |
6229 | ret = -EINVAL; | |
6230 | break; | |
6231 | } | |
6232 | ||
def596e9 JA |
6233 | if (ret) |
6234 | return ret; | |
6235 | ||
b532576e JA |
6236 | /* If the op doesn't have a file, we're not polling for it */ |
6237 | if ((ctx->flags & IORING_SETUP_IOPOLL) && req->file) { | |
11ba820b JA |
6238 | const bool in_async = io_wq_current_is_worker(); |
6239 | ||
11ba820b JA |
6240 | /* workqueue context doesn't hold uring_lock, grab it now */ |
6241 | if (in_async) | |
6242 | mutex_lock(&ctx->uring_lock); | |
6243 | ||
def596e9 | 6244 | io_iopoll_req_issued(req); |
11ba820b JA |
6245 | |
6246 | if (in_async) | |
6247 | mutex_unlock(&ctx->uring_lock); | |
def596e9 JA |
6248 | } |
6249 | ||
6250 | return 0; | |
2b188cc1 JA |
6251 | } |
6252 | ||
f4db7182 | 6253 | static struct io_wq_work *io_wq_submit_work(struct io_wq_work *work) |
2b188cc1 JA |
6254 | { |
6255 | struct io_kiocb *req = container_of(work, struct io_kiocb, work); | |
6df1db6b | 6256 | struct io_kiocb *timeout; |
561fb04a | 6257 | int ret = 0; |
2b188cc1 | 6258 | |
6df1db6b PB |
6259 | timeout = io_prep_linked_timeout(req); |
6260 | if (timeout) | |
6261 | io_queue_linked_timeout(timeout); | |
d4c81f38 | 6262 | |
0c9d5ccd JA |
6263 | /* if NO_CANCEL is set, we must still run the work */ |
6264 | if ((work->flags & (IO_WQ_WORK_CANCEL|IO_WQ_WORK_NO_CANCEL)) == | |
6265 | IO_WQ_WORK_CANCEL) { | |
561fb04a | 6266 | ret = -ECANCELED; |
0c9d5ccd | 6267 | } |
31b51510 | 6268 | |
561fb04a | 6269 | if (!ret) { |
561fb04a | 6270 | do { |
c1379e24 | 6271 | ret = io_issue_sqe(req, false, NULL); |
561fb04a JA |
6272 | /* |
6273 | * We can get EAGAIN for polled IO even though we're | |
6274 | * forcing a sync submission from here, since we can't | |
6275 | * wait for request slots on the block side. | |
6276 | */ | |
6277 | if (ret != -EAGAIN) | |
6278 | break; | |
6279 | cond_resched(); | |
6280 | } while (1); | |
6281 | } | |
31b51510 | 6282 | |
561fb04a | 6283 | if (ret) { |
4e88d6e7 | 6284 | req_set_fail_links(req); |
e1e16097 | 6285 | io_req_complete(req, ret); |
edafccee | 6286 | } |
2b188cc1 | 6287 | |
f4db7182 | 6288 | return io_steal_work(req); |
2b188cc1 JA |
6289 | } |
6290 | ||
65e19f54 JA |
6291 | static inline struct file *io_file_from_index(struct io_ring_ctx *ctx, |
6292 | int index) | |
6293 | { | |
6294 | struct fixed_file_table *table; | |
6295 | ||
05f3fb3c | 6296 | table = &ctx->file_data->table[index >> IORING_FILE_TABLE_SHIFT]; |
84695089 | 6297 | return table->files[index & IORING_FILE_TABLE_MASK]; |
65e19f54 JA |
6298 | } |
6299 | ||
8371adf5 PB |
6300 | static struct file *io_file_get(struct io_submit_state *state, |
6301 | struct io_kiocb *req, int fd, bool fixed) | |
09bb8394 | 6302 | { |
a197f664 | 6303 | struct io_ring_ctx *ctx = req->ctx; |
8da11c19 | 6304 | struct file *file; |
09bb8394 | 6305 | |
8da11c19 | 6306 | if (fixed) { |
479f517b | 6307 | if (unlikely((unsigned int)fd >= ctx->nr_user_files)) |
8371adf5 | 6308 | return NULL; |
b7620121 | 6309 | fd = array_index_nospec(fd, ctx->nr_user_files); |
8da11c19 | 6310 | file = io_file_from_index(ctx, fd); |
fd2206e4 | 6311 | if (file) { |
b2e96852 | 6312 | req->fixed_file_refs = &ctx->file_data->node->refs; |
fd2206e4 JA |
6313 | percpu_ref_get(req->fixed_file_refs); |
6314 | } | |
09bb8394 | 6315 | } else { |
c826bd7a | 6316 | trace_io_uring_file_get(ctx, fd); |
8da11c19 | 6317 | file = __io_file_get(state, fd); |
09bb8394 JA |
6318 | } |
6319 | ||
8371adf5 | 6320 | return file; |
09bb8394 JA |
6321 | } |
6322 | ||
8da11c19 | 6323 | static int io_req_set_file(struct io_submit_state *state, struct io_kiocb *req, |
63ff8223 | 6324 | int fd) |
8da11c19 | 6325 | { |
28cea78a | 6326 | req->file = io_file_get(state, req, fd, req->flags & REQ_F_FIXED_FILE); |
8371adf5 | 6327 | if (req->file || io_op_defs[req->opcode].needs_file_no_error) |
f86cd20c | 6328 | return 0; |
8371adf5 | 6329 | return -EBADF; |
f56040b8 PB |
6330 | } |
6331 | ||
2665abfd | 6332 | static enum hrtimer_restart io_link_timeout_fn(struct hrtimer *timer) |
2b188cc1 | 6333 | { |
ad8a48ac JA |
6334 | struct io_timeout_data *data = container_of(timer, |
6335 | struct io_timeout_data, timer); | |
90cd7e42 | 6336 | struct io_kiocb *prev, *req = data->req; |
2665abfd | 6337 | struct io_ring_ctx *ctx = req->ctx; |
2665abfd | 6338 | unsigned long flags; |
2665abfd JA |
6339 | |
6340 | spin_lock_irqsave(&ctx->completion_lock, flags); | |
90cd7e42 PB |
6341 | prev = req->timeout.head; |
6342 | req->timeout.head = NULL; | |
2665abfd JA |
6343 | |
6344 | /* | |
6345 | * We don't expect the list to be empty, that will only happen if we | |
6346 | * race with the completion of the linked work. | |
6347 | */ | |
90cd7e42 | 6348 | if (prev && refcount_inc_not_zero(&prev->refs)) |
f2f87370 | 6349 | io_remove_next_linked(prev); |
90cd7e42 PB |
6350 | else |
6351 | prev = NULL; | |
2665abfd JA |
6352 | spin_unlock_irqrestore(&ctx->completion_lock, flags); |
6353 | ||
6354 | if (prev) { | |
4e88d6e7 | 6355 | req_set_fail_links(prev); |
014db007 | 6356 | io_async_find_and_cancel(ctx, req, prev->user_data, -ETIME); |
76a46e06 | 6357 | io_put_req(prev); |
47f46768 | 6358 | } else { |
e1e16097 | 6359 | io_req_complete(req, -ETIME); |
2665abfd | 6360 | } |
2665abfd JA |
6361 | return HRTIMER_NORESTART; |
6362 | } | |
6363 | ||
7271ef3a | 6364 | static void __io_queue_linked_timeout(struct io_kiocb *req) |
2665abfd | 6365 | { |
76a46e06 | 6366 | /* |
f2f87370 PB |
6367 | * If the back reference is NULL, then our linked request finished |
6368 | * before we got a chance to setup the timer | |
76a46e06 | 6369 | */ |
90cd7e42 | 6370 | if (req->timeout.head) { |
e8c2bc1f | 6371 | struct io_timeout_data *data = req->async_data; |
94ae5e77 | 6372 | |
ad8a48ac JA |
6373 | data->timer.function = io_link_timeout_fn; |
6374 | hrtimer_start(&data->timer, timespec64_to_ktime(data->ts), | |
6375 | data->mode); | |
2665abfd | 6376 | } |
7271ef3a JA |
6377 | } |
6378 | ||
6379 | static void io_queue_linked_timeout(struct io_kiocb *req) | |
6380 | { | |
6381 | struct io_ring_ctx *ctx = req->ctx; | |
6382 | ||
6383 | spin_lock_irq(&ctx->completion_lock); | |
6384 | __io_queue_linked_timeout(req); | |
76a46e06 | 6385 | spin_unlock_irq(&ctx->completion_lock); |
2665abfd | 6386 | |
2665abfd | 6387 | /* drop submission reference */ |
76a46e06 JA |
6388 | io_put_req(req); |
6389 | } | |
2665abfd | 6390 | |
ad8a48ac | 6391 | static struct io_kiocb *io_prep_linked_timeout(struct io_kiocb *req) |
2665abfd | 6392 | { |
f2f87370 | 6393 | struct io_kiocb *nxt = req->link; |
2665abfd | 6394 | |
f2f87370 PB |
6395 | if (!nxt || (req->flags & REQ_F_LINK_TIMEOUT) || |
6396 | nxt->opcode != IORING_OP_LINK_TIMEOUT) | |
76a46e06 | 6397 | return NULL; |
2665abfd | 6398 | |
90cd7e42 | 6399 | nxt->timeout.head = req; |
900fad45 | 6400 | nxt->flags |= REQ_F_LTIMEOUT_ACTIVE; |
76a46e06 | 6401 | req->flags |= REQ_F_LINK_TIMEOUT; |
76a46e06 | 6402 | return nxt; |
2665abfd JA |
6403 | } |
6404 | ||
c1379e24 | 6405 | static void __io_queue_sqe(struct io_kiocb *req, struct io_comp_state *cs) |
2b188cc1 | 6406 | { |
4a0a7a18 | 6407 | struct io_kiocb *linked_timeout; |
193155c8 | 6408 | const struct cred *old_creds = NULL; |
e0c5c576 | 6409 | int ret; |
2b188cc1 | 6410 | |
4a0a7a18 JA |
6411 | again: |
6412 | linked_timeout = io_prep_linked_timeout(req); | |
6413 | ||
2e5aa6cb PB |
6414 | if ((req->flags & REQ_F_WORK_INITIALIZED) && |
6415 | (req->work.flags & IO_WQ_WORK_CREDS) && | |
98447d65 | 6416 | req->work.identity->creds != current_cred()) { |
193155c8 JA |
6417 | if (old_creds) |
6418 | revert_creds(old_creds); | |
98447d65 | 6419 | if (old_creds == req->work.identity->creds) |
193155c8 JA |
6420 | old_creds = NULL; /* restored original creds */ |
6421 | else | |
98447d65 | 6422 | old_creds = override_creds(req->work.identity->creds); |
193155c8 JA |
6423 | } |
6424 | ||
c1379e24 | 6425 | ret = io_issue_sqe(req, true, cs); |
491381ce JA |
6426 | |
6427 | /* | |
6428 | * We async punt it if the file wasn't marked NOWAIT, or if the file | |
6429 | * doesn't support non-blocking read/write attempts | |
6430 | */ | |
24c74678 | 6431 | if (ret == -EAGAIN && !(req->flags & REQ_F_NOWAIT)) { |
f063c547 | 6432 | if (!io_arm_poll_handler(req)) { |
f063c547 PB |
6433 | /* |
6434 | * Queued up for async execution, worker will release | |
6435 | * submit reference when the iocb is actually submitted. | |
6436 | */ | |
6437 | io_queue_async_work(req); | |
2b188cc1 | 6438 | } |
bbad27b2 | 6439 | |
f063c547 PB |
6440 | if (linked_timeout) |
6441 | io_queue_linked_timeout(linked_timeout); | |
0d63c148 PB |
6442 | } else if (likely(!ret)) { |
6443 | /* drop submission reference */ | |
6444 | req = io_put_req_find_next(req); | |
6445 | if (linked_timeout) | |
6446 | io_queue_linked_timeout(linked_timeout); | |
e65ef56d | 6447 | |
0d63c148 PB |
6448 | if (req) { |
6449 | if (!(req->flags & REQ_F_FORCE_ASYNC)) | |
6450 | goto again; | |
6451 | io_queue_async_work(req); | |
6452 | } | |
6453 | } else { | |
652532ad PB |
6454 | /* un-prep timeout, so it'll be killed as any other linked */ |
6455 | req->flags &= ~REQ_F_LINK_TIMEOUT; | |
4e88d6e7 | 6456 | req_set_fail_links(req); |
e65ef56d | 6457 | io_put_req(req); |
e1e16097 | 6458 | io_req_complete(req, ret); |
9e645e11 | 6459 | } |
652532ad | 6460 | |
193155c8 JA |
6461 | if (old_creds) |
6462 | revert_creds(old_creds); | |
2b188cc1 JA |
6463 | } |
6464 | ||
f13fad7b JA |
6465 | static void io_queue_sqe(struct io_kiocb *req, const struct io_uring_sqe *sqe, |
6466 | struct io_comp_state *cs) | |
4fe2c963 JL |
6467 | { |
6468 | int ret; | |
6469 | ||
3529d8c2 | 6470 | ret = io_req_defer(req, sqe); |
4fe2c963 JL |
6471 | if (ret) { |
6472 | if (ret != -EIOCBQUEUED) { | |
1118591a | 6473 | fail_req: |
4e88d6e7 | 6474 | req_set_fail_links(req); |
e1e16097 JA |
6475 | io_put_req(req); |
6476 | io_req_complete(req, ret); | |
4fe2c963 | 6477 | } |
2550878f | 6478 | } else if (req->flags & REQ_F_FORCE_ASYNC) { |
e8c2bc1f | 6479 | if (!req->async_data) { |
bd2ab18a | 6480 | ret = io_req_defer_prep(req, sqe); |
327d6d96 | 6481 | if (unlikely(ret)) |
bd2ab18a PB |
6482 | goto fail_req; |
6483 | } | |
ce35a47a JA |
6484 | io_queue_async_work(req); |
6485 | } else { | |
c1379e24 PB |
6486 | if (sqe) { |
6487 | ret = io_req_prep(req, sqe); | |
6488 | if (unlikely(ret)) | |
6489 | goto fail_req; | |
6490 | } | |
6491 | __io_queue_sqe(req, cs); | |
ce35a47a | 6492 | } |
4fe2c963 JL |
6493 | } |
6494 | ||
f13fad7b JA |
6495 | static inline void io_queue_link_head(struct io_kiocb *req, |
6496 | struct io_comp_state *cs) | |
4fe2c963 | 6497 | { |
94ae5e77 | 6498 | if (unlikely(req->flags & REQ_F_FAIL_LINK)) { |
e1e16097 JA |
6499 | io_put_req(req); |
6500 | io_req_complete(req, -ECANCELED); | |
1b4a51b6 | 6501 | } else |
f13fad7b | 6502 | io_queue_sqe(req, NULL, cs); |
4fe2c963 JL |
6503 | } |
6504 | ||
863e0560 PB |
6505 | struct io_submit_link { |
6506 | struct io_kiocb *head; | |
6507 | struct io_kiocb *last; | |
6508 | }; | |
6509 | ||
1d4240cc | 6510 | static int io_submit_sqe(struct io_kiocb *req, const struct io_uring_sqe *sqe, |
863e0560 | 6511 | struct io_submit_link *link, struct io_comp_state *cs) |
9e645e11 | 6512 | { |
a197f664 | 6513 | struct io_ring_ctx *ctx = req->ctx; |
ef4ff581 | 6514 | int ret; |
9e645e11 | 6515 | |
9e645e11 JA |
6516 | /* |
6517 | * If we already have a head request, queue this one for async | |
6518 | * submittal once the head completes. If we don't have a head but | |
6519 | * IOSQE_IO_LINK is set in the sqe, start a new head. This one will be | |
6520 | * submitted sync once the chain is complete. If none of those | |
6521 | * conditions are true (normal request), then just queue it. | |
6522 | */ | |
863e0560 PB |
6523 | if (link->head) { |
6524 | struct io_kiocb *head = link->head; | |
4e88d6e7 | 6525 | |
8cdf2193 PB |
6526 | /* |
6527 | * Taking sequential execution of a link, draining both sides | |
6528 | * of the link also fullfils IOSQE_IO_DRAIN semantics for all | |
6529 | * requests in the link. So, it drains the head and the | |
6530 | * next after the link request. The last one is done via | |
6531 | * drain_next flag to persist the effect across calls. | |
6532 | */ | |
ef4ff581 | 6533 | if (req->flags & REQ_F_IO_DRAIN) { |
711be031 PB |
6534 | head->flags |= REQ_F_IO_DRAIN; |
6535 | ctx->drain_next = 1; | |
6536 | } | |
3529d8c2 | 6537 | ret = io_req_defer_prep(req, sqe); |
327d6d96 | 6538 | if (unlikely(ret)) { |
4e88d6e7 | 6539 | /* fail even hard links since we don't submit */ |
9d76377f | 6540 | head->flags |= REQ_F_FAIL_LINK; |
1d4240cc | 6541 | return ret; |
2d28390a | 6542 | } |
9d76377f | 6543 | trace_io_uring_link(ctx, req, head); |
f2f87370 | 6544 | link->last->link = req; |
863e0560 | 6545 | link->last = req; |
32fe525b PB |
6546 | |
6547 | /* last request of a link, enqueue the link */ | |
ef4ff581 | 6548 | if (!(req->flags & (REQ_F_LINK | REQ_F_HARDLINK))) { |
f13fad7b | 6549 | io_queue_link_head(head, cs); |
863e0560 | 6550 | link->head = NULL; |
32fe525b | 6551 | } |
9e645e11 | 6552 | } else { |
711be031 PB |
6553 | if (unlikely(ctx->drain_next)) { |
6554 | req->flags |= REQ_F_IO_DRAIN; | |
ef4ff581 | 6555 | ctx->drain_next = 0; |
711be031 | 6556 | } |
ef4ff581 | 6557 | if (req->flags & (REQ_F_LINK | REQ_F_HARDLINK)) { |
711be031 | 6558 | ret = io_req_defer_prep(req, sqe); |
327d6d96 | 6559 | if (unlikely(ret)) |
711be031 | 6560 | req->flags |= REQ_F_FAIL_LINK; |
863e0560 PB |
6561 | link->head = req; |
6562 | link->last = req; | |
711be031 | 6563 | } else { |
f13fad7b | 6564 | io_queue_sqe(req, sqe, cs); |
711be031 | 6565 | } |
9e645e11 | 6566 | } |
2e6e1fde | 6567 | |
1d4240cc | 6568 | return 0; |
9e645e11 JA |
6569 | } |
6570 | ||
9a56a232 JA |
6571 | /* |
6572 | * Batched submission is done, ensure local IO is flushed out. | |
6573 | */ | |
6574 | static void io_submit_state_end(struct io_submit_state *state) | |
6575 | { | |
f13fad7b JA |
6576 | if (!list_empty(&state->comp.list)) |
6577 | io_submit_flush_completions(&state->comp); | |
27926b68 JA |
6578 | if (state->plug_started) |
6579 | blk_finish_plug(&state->plug); | |
9f13c35b | 6580 | io_state_file_put(state); |
2579f913 | 6581 | if (state->free_reqs) |
6c8a3134 | 6582 | kmem_cache_free_bulk(req_cachep, state->free_reqs, state->reqs); |
9a56a232 JA |
6583 | } |
6584 | ||
6585 | /* | |
6586 | * Start submission side cache. | |
6587 | */ | |
6588 | static void io_submit_state_start(struct io_submit_state *state, | |
013538bd | 6589 | struct io_ring_ctx *ctx, unsigned int max_ios) |
9a56a232 | 6590 | { |
27926b68 | 6591 | state->plug_started = false; |
013538bd JA |
6592 | state->comp.nr = 0; |
6593 | INIT_LIST_HEAD(&state->comp.list); | |
6594 | state->comp.ctx = ctx; | |
2579f913 | 6595 | state->free_reqs = 0; |
9a56a232 JA |
6596 | state->file = NULL; |
6597 | state->ios_left = max_ios; | |
6598 | } | |
6599 | ||
2b188cc1 JA |
6600 | static void io_commit_sqring(struct io_ring_ctx *ctx) |
6601 | { | |
75b28aff | 6602 | struct io_rings *rings = ctx->rings; |
2b188cc1 | 6603 | |
caf582c6 PB |
6604 | /* |
6605 | * Ensure any loads from the SQEs are done at this point, | |
6606 | * since once we write the new head, the application could | |
6607 | * write new data to them. | |
6608 | */ | |
6609 | smp_store_release(&rings->sq.head, ctx->cached_sq_head); | |
2b188cc1 JA |
6610 | } |
6611 | ||
2b188cc1 | 6612 | /* |
3529d8c2 | 6613 | * Fetch an sqe, if one is available. Note that sqe_ptr will point to memory |
2b188cc1 JA |
6614 | * that is mapped by userspace. This means that care needs to be taken to |
6615 | * ensure that reads are stable, as we cannot rely on userspace always | |
6616 | * being a good citizen. If members of the sqe are validated and then later | |
6617 | * used, it's important that those reads are done through READ_ONCE() to | |
6618 | * prevent a re-load down the line. | |
6619 | */ | |
709b302f | 6620 | static const struct io_uring_sqe *io_get_sqe(struct io_ring_ctx *ctx) |
2b188cc1 | 6621 | { |
75b28aff | 6622 | u32 *sq_array = ctx->sq_array; |
2b188cc1 JA |
6623 | unsigned head; |
6624 | ||
6625 | /* | |
6626 | * The cached sq head (or cq tail) serves two purposes: | |
6627 | * | |
6628 | * 1) allows us to batch the cost of updating the user visible | |
6629 | * head updates. | |
6630 | * 2) allows the kernel side to track the head on its own, even | |
6631 | * though the application is the one updating it. | |
6632 | */ | |
ee7d46d9 | 6633 | head = READ_ONCE(sq_array[ctx->cached_sq_head & ctx->sq_mask]); |
709b302f PB |
6634 | if (likely(head < ctx->sq_entries)) |
6635 | return &ctx->sq_sqes[head]; | |
2b188cc1 JA |
6636 | |
6637 | /* drop invalid entries */ | |
498ccd9e | 6638 | ctx->cached_sq_dropped++; |
ee7d46d9 | 6639 | WRITE_ONCE(ctx->rings->sq_dropped, ctx->cached_sq_dropped); |
709b302f PB |
6640 | return NULL; |
6641 | } | |
6642 | ||
6643 | static inline void io_consume_sqe(struct io_ring_ctx *ctx) | |
6644 | { | |
6645 | ctx->cached_sq_head++; | |
2b188cc1 JA |
6646 | } |
6647 | ||
21b55dbc SG |
6648 | /* |
6649 | * Check SQE restrictions (opcode and flags). | |
6650 | * | |
6651 | * Returns 'true' if SQE is allowed, 'false' otherwise. | |
6652 | */ | |
6653 | static inline bool io_check_restriction(struct io_ring_ctx *ctx, | |
6654 | struct io_kiocb *req, | |
6655 | unsigned int sqe_flags) | |
6656 | { | |
6657 | if (!ctx->restricted) | |
6658 | return true; | |
6659 | ||
6660 | if (!test_bit(req->opcode, ctx->restrictions.sqe_op)) | |
6661 | return false; | |
6662 | ||
6663 | if ((sqe_flags & ctx->restrictions.sqe_flags_required) != | |
6664 | ctx->restrictions.sqe_flags_required) | |
6665 | return false; | |
6666 | ||
6667 | if (sqe_flags & ~(ctx->restrictions.sqe_flags_allowed | | |
6668 | ctx->restrictions.sqe_flags_required)) | |
6669 | return false; | |
6670 | ||
6671 | return true; | |
6672 | } | |
6673 | ||
ef4ff581 PB |
6674 | #define SQE_VALID_FLAGS (IOSQE_FIXED_FILE|IOSQE_IO_DRAIN|IOSQE_IO_LINK| \ |
6675 | IOSQE_IO_HARDLINK | IOSQE_ASYNC | \ | |
6676 | IOSQE_BUFFER_SELECT) | |
6677 | ||
6678 | static int io_init_req(struct io_ring_ctx *ctx, struct io_kiocb *req, | |
6679 | const struct io_uring_sqe *sqe, | |
0cdaf760 | 6680 | struct io_submit_state *state) |
0553b8bd | 6681 | { |
ef4ff581 | 6682 | unsigned int sqe_flags; |
71b547c0 | 6683 | int id, ret; |
ef4ff581 | 6684 | |
0553b8bd PB |
6685 | req->opcode = READ_ONCE(sqe->opcode); |
6686 | req->user_data = READ_ONCE(sqe->user_data); | |
e8c2bc1f | 6687 | req->async_data = NULL; |
0553b8bd PB |
6688 | req->file = NULL; |
6689 | req->ctx = ctx; | |
6690 | req->flags = 0; | |
f2f87370 | 6691 | req->link = NULL; |
0553b8bd PB |
6692 | /* one is dropped after submission, the other at completion */ |
6693 | refcount_set(&req->refs, 2); | |
4dd2824d | 6694 | req->task = current; |
0553b8bd | 6695 | req->result = 0; |
ef4ff581 PB |
6696 | |
6697 | if (unlikely(req->opcode >= IORING_OP_LAST)) | |
6698 | return -EINVAL; | |
6699 | ||
28cea78a | 6700 | if (unlikely(io_sq_thread_acquire_mm_files(ctx, req))) |
9d8426a0 | 6701 | return -EFAULT; |
ef4ff581 PB |
6702 | |
6703 | sqe_flags = READ_ONCE(sqe->flags); | |
6704 | /* enforce forwards compatibility on users */ | |
6705 | if (unlikely(sqe_flags & ~SQE_VALID_FLAGS)) | |
6706 | return -EINVAL; | |
6707 | ||
21b55dbc SG |
6708 | if (unlikely(!io_check_restriction(ctx, req, sqe_flags))) |
6709 | return -EACCES; | |
6710 | ||
ef4ff581 PB |
6711 | if ((sqe_flags & IOSQE_BUFFER_SELECT) && |
6712 | !io_op_defs[req->opcode].buffer_select) | |
6713 | return -EOPNOTSUPP; | |
6714 | ||
6715 | id = READ_ONCE(sqe->personality); | |
6716 | if (id) { | |
1e6fa521 JA |
6717 | struct io_identity *iod; |
6718 | ||
1e6fa521 JA |
6719 | iod = idr_find(&ctx->personality_idr, id); |
6720 | if (unlikely(!iod)) | |
ef4ff581 | 6721 | return -EINVAL; |
1e6fa521 | 6722 | refcount_inc(&iod->count); |
ec99ca6c PB |
6723 | |
6724 | __io_req_init_async(req); | |
1e6fa521 JA |
6725 | get_cred(iod->creds); |
6726 | req->work.identity = iod; | |
dfead8a8 | 6727 | req->work.flags |= IO_WQ_WORK_CREDS; |
ef4ff581 PB |
6728 | } |
6729 | ||
6730 | /* same numerical values with corresponding REQ_F_*, safe to copy */ | |
c11368a5 | 6731 | req->flags |= sqe_flags; |
ef4ff581 | 6732 | |
27926b68 JA |
6733 | /* |
6734 | * Plug now if we have more than 1 IO left after this, and the target | |
6735 | * is potentially a read/write to block based storage. | |
6736 | */ | |
6737 | if (!state->plug_started && state->ios_left > 1 && | |
6738 | io_op_defs[req->opcode].plug) { | |
6739 | blk_start_plug(&state->plug); | |
6740 | state->plug_started = true; | |
6741 | } | |
6742 | ||
63ff8223 JA |
6743 | if (!io_op_defs[req->opcode].needs_file) |
6744 | return 0; | |
6745 | ||
71b547c0 PB |
6746 | ret = io_req_set_file(state, req, READ_ONCE(sqe->fd)); |
6747 | state->ios_left--; | |
6748 | return ret; | |
0553b8bd PB |
6749 | } |
6750 | ||
0f212204 | 6751 | static int io_submit_sqes(struct io_ring_ctx *ctx, unsigned int nr) |
6c271ce2 | 6752 | { |
ac8691c4 | 6753 | struct io_submit_state state; |
863e0560 | 6754 | struct io_submit_link link; |
9e645e11 | 6755 | int i, submitted = 0; |
6c271ce2 | 6756 | |
c4a2ed72 | 6757 | /* if we have a backlog and couldn't flush it all, return BUSY */ |
ad3eb2c8 JA |
6758 | if (test_bit(0, &ctx->sq_check_overflow)) { |
6759 | if (!list_empty(&ctx->cq_overflow_list) && | |
e6c8aa9a | 6760 | !io_cqring_overflow_flush(ctx, false, NULL, NULL)) |
ad3eb2c8 JA |
6761 | return -EBUSY; |
6762 | } | |
6c271ce2 | 6763 | |
ee7d46d9 PB |
6764 | /* make sure SQ entry isn't read before tail */ |
6765 | nr = min3(nr, ctx->sq_entries, io_sqring_entries(ctx)); | |
9ef4f124 | 6766 | |
2b85edfc PB |
6767 | if (!percpu_ref_tryget_many(&ctx->refs, nr)) |
6768 | return -EAGAIN; | |
6c271ce2 | 6769 | |
d8a6df10 | 6770 | percpu_counter_add(¤t->io_uring->inflight, nr); |
faf7b51c | 6771 | refcount_add(nr, ¤t->usage); |
6c271ce2 | 6772 | |
013538bd | 6773 | io_submit_state_start(&state, ctx, nr); |
863e0560 | 6774 | link.head = NULL; |
b14cca0c | 6775 | |
6c271ce2 | 6776 | for (i = 0; i < nr; i++) { |
3529d8c2 | 6777 | const struct io_uring_sqe *sqe; |
196be95c | 6778 | struct io_kiocb *req; |
1cb1edb2 | 6779 | int err; |
fb5ccc98 | 6780 | |
b1e50e54 PB |
6781 | sqe = io_get_sqe(ctx); |
6782 | if (unlikely(!sqe)) { | |
6783 | io_consume_sqe(ctx); | |
6784 | break; | |
6785 | } | |
ac8691c4 | 6786 | req = io_alloc_req(ctx, &state); |
196be95c PB |
6787 | if (unlikely(!req)) { |
6788 | if (!submitted) | |
6789 | submitted = -EAGAIN; | |
fb5ccc98 | 6790 | break; |
196be95c | 6791 | } |
709b302f | 6792 | io_consume_sqe(ctx); |
d3656344 JA |
6793 | /* will complete beyond this point, count as submitted */ |
6794 | submitted++; | |
6795 | ||
692d8363 | 6796 | err = io_init_req(ctx, req, sqe, &state); |
ef4ff581 | 6797 | if (unlikely(err)) { |
1cb1edb2 | 6798 | fail_req: |
e1e16097 JA |
6799 | io_put_req(req); |
6800 | io_req_complete(req, err); | |
196be95c PB |
6801 | break; |
6802 | } | |
fb5ccc98 | 6803 | |
354420f7 | 6804 | trace_io_uring_submit_sqe(ctx, req->opcode, req->user_data, |
0cdaf760 | 6805 | true, io_async_submit(ctx)); |
f13fad7b | 6806 | err = io_submit_sqe(req, sqe, &link, &state.comp); |
1d4240cc PB |
6807 | if (err) |
6808 | goto fail_req; | |
6c271ce2 JA |
6809 | } |
6810 | ||
9466f437 PB |
6811 | if (unlikely(submitted != nr)) { |
6812 | int ref_used = (submitted == -EAGAIN) ? 0 : submitted; | |
d8a6df10 JA |
6813 | struct io_uring_task *tctx = current->io_uring; |
6814 | int unused = nr - ref_used; | |
9466f437 | 6815 | |
d8a6df10 JA |
6816 | percpu_ref_put_many(&ctx->refs, unused); |
6817 | percpu_counter_sub(&tctx->inflight, unused); | |
6818 | put_task_struct_many(current, unused); | |
9466f437 | 6819 | } |
863e0560 PB |
6820 | if (link.head) |
6821 | io_queue_link_head(link.head, &state.comp); | |
ac8691c4 | 6822 | io_submit_state_end(&state); |
6c271ce2 | 6823 | |
ae9428ca PB |
6824 | /* Commit SQ ring head once we've consumed and submitted all SQEs */ |
6825 | io_commit_sqring(ctx); | |
6826 | ||
6c271ce2 JA |
6827 | return submitted; |
6828 | } | |
6829 | ||
23b3628e XW |
6830 | static inline void io_ring_set_wakeup_flag(struct io_ring_ctx *ctx) |
6831 | { | |
6832 | /* Tell userspace we may need a wakeup call */ | |
6833 | spin_lock_irq(&ctx->completion_lock); | |
6834 | ctx->rings->sq_flags |= IORING_SQ_NEED_WAKEUP; | |
6835 | spin_unlock_irq(&ctx->completion_lock); | |
6836 | } | |
6837 | ||
6838 | static inline void io_ring_clear_wakeup_flag(struct io_ring_ctx *ctx) | |
6839 | { | |
6840 | spin_lock_irq(&ctx->completion_lock); | |
6841 | ctx->rings->sq_flags &= ~IORING_SQ_NEED_WAKEUP; | |
6842 | spin_unlock_irq(&ctx->completion_lock); | |
6843 | } | |
6844 | ||
08369246 | 6845 | static int __io_sq_thread(struct io_ring_ctx *ctx, bool cap_entries) |
6c271ce2 | 6846 | { |
c8d1ba58 | 6847 | unsigned int to_submit; |
bdcd3eab | 6848 | int ret = 0; |
6c271ce2 | 6849 | |
c8d1ba58 | 6850 | to_submit = io_sqring_entries(ctx); |
e95eee2d JA |
6851 | /* if we're handling multiple rings, cap submit size for fairness */ |
6852 | if (cap_entries && to_submit > 8) | |
6853 | to_submit = 8; | |
6854 | ||
906a3c6f XW |
6855 | if (!list_empty(&ctx->iopoll_list) || to_submit) { |
6856 | unsigned nr_events = 0; | |
6857 | ||
08369246 | 6858 | mutex_lock(&ctx->uring_lock); |
906a3c6f XW |
6859 | if (!list_empty(&ctx->iopoll_list)) |
6860 | io_do_iopoll(ctx, &nr_events, 0); | |
6861 | ||
6862 | if (to_submit && likely(!percpu_ref_is_dying(&ctx->refs))) | |
08369246 XW |
6863 | ret = io_submit_sqes(ctx, to_submit); |
6864 | mutex_unlock(&ctx->uring_lock); | |
6865 | } | |
90554200 JA |
6866 | |
6867 | if (!io_sqring_full(ctx) && wq_has_sleeper(&ctx->sqo_sq_wait)) | |
6868 | wake_up(&ctx->sqo_sq_wait); | |
6869 | ||
08369246 XW |
6870 | return ret; |
6871 | } | |
6872 | ||
6873 | static void io_sqd_update_thread_idle(struct io_sq_data *sqd) | |
6874 | { | |
6875 | struct io_ring_ctx *ctx; | |
6876 | unsigned sq_thread_idle = 0; | |
6877 | ||
6878 | list_for_each_entry(ctx, &sqd->ctx_list, sqd_list) { | |
6879 | if (sq_thread_idle < ctx->sq_thread_idle) | |
6880 | sq_thread_idle = ctx->sq_thread_idle; | |
6881 | } | |
6882 | ||
6883 | sqd->sq_thread_idle = sq_thread_idle; | |
c8d1ba58 | 6884 | } |
6c271ce2 | 6885 | |
69fb2131 JA |
6886 | static void io_sqd_init_new(struct io_sq_data *sqd) |
6887 | { | |
6888 | struct io_ring_ctx *ctx; | |
6889 | ||
6890 | while (!list_empty(&sqd->ctx_new_list)) { | |
6891 | ctx = list_first_entry(&sqd->ctx_new_list, struct io_ring_ctx, sqd_list); | |
69fb2131 JA |
6892 | list_move_tail(&ctx->sqd_list, &sqd->ctx_list); |
6893 | complete(&ctx->sq_thread_comp); | |
6894 | } | |
08369246 XW |
6895 | |
6896 | io_sqd_update_thread_idle(sqd); | |
69fb2131 JA |
6897 | } |
6898 | ||
c8d1ba58 JA |
6899 | static int io_sq_thread(void *data) |
6900 | { | |
91d8f519 | 6901 | struct cgroup_subsys_state *cur_css = NULL; |
28cea78a JA |
6902 | struct files_struct *old_files = current->files; |
6903 | struct nsproxy *old_nsproxy = current->nsproxy; | |
69fb2131 JA |
6904 | const struct cred *old_cred = NULL; |
6905 | struct io_sq_data *sqd = data; | |
6906 | struct io_ring_ctx *ctx; | |
a0d9205f | 6907 | unsigned long timeout = 0; |
08369246 | 6908 | DEFINE_WAIT(wait); |
6c271ce2 | 6909 | |
28cea78a JA |
6910 | task_lock(current); |
6911 | current->files = NULL; | |
6912 | current->nsproxy = NULL; | |
6913 | task_unlock(current); | |
6914 | ||
69fb2131 | 6915 | while (!kthread_should_stop()) { |
08369246 XW |
6916 | int ret; |
6917 | bool cap_entries, sqt_spin, needs_sched; | |
c1edbf5f JA |
6918 | |
6919 | /* | |
69fb2131 JA |
6920 | * Any changes to the sqd lists are synchronized through the |
6921 | * kthread parking. This synchronizes the thread vs users, | |
6922 | * the users are synchronized on the sqd->ctx_lock. | |
c1edbf5f | 6923 | */ |
69fb2131 JA |
6924 | if (kthread_should_park()) |
6925 | kthread_parkme(); | |
7143b5ac | 6926 | |
08369246 | 6927 | if (unlikely(!list_empty(&sqd->ctx_new_list))) { |
69fb2131 | 6928 | io_sqd_init_new(sqd); |
08369246 XW |
6929 | timeout = jiffies + sqd->sq_thread_idle; |
6930 | } | |
6c271ce2 | 6931 | |
08369246 | 6932 | sqt_spin = false; |
e95eee2d | 6933 | cap_entries = !list_is_singular(&sqd->ctx_list); |
69fb2131 JA |
6934 | list_for_each_entry(ctx, &sqd->ctx_list, sqd_list) { |
6935 | if (current->cred != ctx->creds) { | |
6936 | if (old_cred) | |
6937 | revert_creds(old_cred); | |
6938 | old_cred = override_creds(ctx->creds); | |
bdcd3eab | 6939 | } |
91d8f519 | 6940 | io_sq_thread_associate_blkcg(ctx, &cur_css); |
4ea33a97 JA |
6941 | #ifdef CONFIG_AUDIT |
6942 | current->loginuid = ctx->loginuid; | |
6943 | current->sessionid = ctx->sessionid; | |
6944 | #endif | |
bdcd3eab | 6945 | |
08369246 XW |
6946 | ret = __io_sq_thread(ctx, cap_entries); |
6947 | if (!sqt_spin && (ret > 0 || !list_empty(&ctx->iopoll_list))) | |
6948 | sqt_spin = true; | |
6c271ce2 | 6949 | |
28cea78a | 6950 | io_sq_thread_drop_mm_files(); |
69fb2131 | 6951 | } |
6c271ce2 | 6952 | |
08369246 | 6953 | if (sqt_spin || !time_after(jiffies, timeout)) { |
c8d1ba58 JA |
6954 | io_run_task_work(); |
6955 | cond_resched(); | |
08369246 XW |
6956 | if (sqt_spin) |
6957 | timeout = jiffies + sqd->sq_thread_idle; | |
6958 | continue; | |
6959 | } | |
6960 | ||
6961 | if (kthread_should_park()) | |
6962 | continue; | |
6963 | ||
6964 | needs_sched = true; | |
6965 | prepare_to_wait(&sqd->wait, &wait, TASK_INTERRUPTIBLE); | |
6966 | list_for_each_entry(ctx, &sqd->ctx_list, sqd_list) { | |
6967 | if ((ctx->flags & IORING_SETUP_IOPOLL) && | |
6968 | !list_empty_careful(&ctx->iopoll_list)) { | |
6969 | needs_sched = false; | |
6970 | break; | |
6971 | } | |
6972 | if (io_sqring_entries(ctx)) { | |
6973 | needs_sched = false; | |
6974 | break; | |
6975 | } | |
6976 | } | |
6977 | ||
6978 | if (needs_sched) { | |
69fb2131 JA |
6979 | list_for_each_entry(ctx, &sqd->ctx_list, sqd_list) |
6980 | io_ring_set_wakeup_flag(ctx); | |
08369246 | 6981 | |
69fb2131 | 6982 | schedule(); |
69fb2131 JA |
6983 | list_for_each_entry(ctx, &sqd->ctx_list, sqd_list) |
6984 | io_ring_clear_wakeup_flag(ctx); | |
6c271ce2 | 6985 | } |
08369246 XW |
6986 | |
6987 | finish_wait(&sqd->wait, &wait); | |
6988 | timeout = jiffies + sqd->sq_thread_idle; | |
6c271ce2 JA |
6989 | } |
6990 | ||
4c6e277c | 6991 | io_run_task_work(); |
b41e9852 | 6992 | |
91d8f519 DZ |
6993 | if (cur_css) |
6994 | io_sq_thread_unassociate_blkcg(); | |
69fb2131 JA |
6995 | if (old_cred) |
6996 | revert_creds(old_cred); | |
06058632 | 6997 | |
28cea78a JA |
6998 | task_lock(current); |
6999 | current->files = old_files; | |
7000 | current->nsproxy = old_nsproxy; | |
7001 | task_unlock(current); | |
7002 | ||
2bbcd6d3 | 7003 | kthread_parkme(); |
06058632 | 7004 | |
6c271ce2 JA |
7005 | return 0; |
7006 | } | |
7007 | ||
bda52162 JA |
7008 | struct io_wait_queue { |
7009 | struct wait_queue_entry wq; | |
7010 | struct io_ring_ctx *ctx; | |
7011 | unsigned to_wait; | |
7012 | unsigned nr_timeouts; | |
7013 | }; | |
7014 | ||
1d7bb1d5 | 7015 | static inline bool io_should_wake(struct io_wait_queue *iowq, bool noflush) |
bda52162 JA |
7016 | { |
7017 | struct io_ring_ctx *ctx = iowq->ctx; | |
7018 | ||
7019 | /* | |
d195a66e | 7020 | * Wake up if we have enough events, or if a timeout occurred since we |
bda52162 JA |
7021 | * started waiting. For timeouts, we always want to return to userspace, |
7022 | * regardless of event count. | |
7023 | */ | |
1d7bb1d5 | 7024 | return io_cqring_events(ctx, noflush) >= iowq->to_wait || |
bda52162 JA |
7025 | atomic_read(&ctx->cq_timeouts) != iowq->nr_timeouts; |
7026 | } | |
7027 | ||
7028 | static int io_wake_function(struct wait_queue_entry *curr, unsigned int mode, | |
7029 | int wake_flags, void *key) | |
7030 | { | |
7031 | struct io_wait_queue *iowq = container_of(curr, struct io_wait_queue, | |
7032 | wq); | |
7033 | ||
1d7bb1d5 JA |
7034 | /* use noflush == true, as we can't safely rely on locking context */ |
7035 | if (!io_should_wake(iowq, true)) | |
bda52162 JA |
7036 | return -1; |
7037 | ||
7038 | return autoremove_wake_function(curr, mode, wake_flags, key); | |
7039 | } | |
7040 | ||
af9c1a44 JA |
7041 | static int io_run_task_work_sig(void) |
7042 | { | |
7043 | if (io_run_task_work()) | |
7044 | return 1; | |
7045 | if (!signal_pending(current)) | |
7046 | return 0; | |
7047 | if (current->jobctl & JOBCTL_TASK_WORK) { | |
7048 | spin_lock_irq(¤t->sighand->siglock); | |
7049 | current->jobctl &= ~JOBCTL_TASK_WORK; | |
7050 | recalc_sigpending(); | |
7051 | spin_unlock_irq(¤t->sighand->siglock); | |
7052 | return 1; | |
7053 | } | |
7054 | return -EINTR; | |
7055 | } | |
7056 | ||
2b188cc1 JA |
7057 | /* |
7058 | * Wait until events become available, if we don't already have some. The | |
7059 | * application must reap them itself, as they reside on the shared cq ring. | |
7060 | */ | |
7061 | static int io_cqring_wait(struct io_ring_ctx *ctx, int min_events, | |
c73ebb68 HX |
7062 | const sigset_t __user *sig, size_t sigsz, |
7063 | struct __kernel_timespec __user *uts) | |
2b188cc1 | 7064 | { |
bda52162 JA |
7065 | struct io_wait_queue iowq = { |
7066 | .wq = { | |
7067 | .private = current, | |
7068 | .func = io_wake_function, | |
7069 | .entry = LIST_HEAD_INIT(iowq.wq.entry), | |
7070 | }, | |
7071 | .ctx = ctx, | |
7072 | .to_wait = min_events, | |
7073 | }; | |
75b28aff | 7074 | struct io_rings *rings = ctx->rings; |
c73ebb68 HX |
7075 | struct timespec64 ts; |
7076 | signed long timeout = 0; | |
e9ffa5c2 | 7077 | int ret = 0; |
2b188cc1 | 7078 | |
b41e9852 JA |
7079 | do { |
7080 | if (io_cqring_events(ctx, false) >= min_events) | |
7081 | return 0; | |
4c6e277c | 7082 | if (!io_run_task_work()) |
b41e9852 | 7083 | break; |
b41e9852 | 7084 | } while (1); |
2b188cc1 JA |
7085 | |
7086 | if (sig) { | |
9e75ad5d AB |
7087 | #ifdef CONFIG_COMPAT |
7088 | if (in_compat_syscall()) | |
7089 | ret = set_compat_user_sigmask((const compat_sigset_t __user *)sig, | |
b772434b | 7090 | sigsz); |
9e75ad5d AB |
7091 | else |
7092 | #endif | |
b772434b | 7093 | ret = set_user_sigmask(sig, sigsz); |
9e75ad5d | 7094 | |
2b188cc1 JA |
7095 | if (ret) |
7096 | return ret; | |
7097 | } | |
7098 | ||
c73ebb68 HX |
7099 | if (uts) { |
7100 | if (get_timespec64(&ts, uts)) | |
7101 | return -EFAULT; | |
7102 | timeout = timespec64_to_jiffies(&ts); | |
7103 | } | |
7104 | ||
bda52162 | 7105 | iowq.nr_timeouts = atomic_read(&ctx->cq_timeouts); |
c826bd7a | 7106 | trace_io_uring_cqring_wait(ctx, min_events); |
bda52162 JA |
7107 | do { |
7108 | prepare_to_wait_exclusive(&ctx->wait, &iowq.wq, | |
7109 | TASK_INTERRUPTIBLE); | |
ce593a6c | 7110 | /* make sure we run task_work before checking for signals */ |
af9c1a44 JA |
7111 | ret = io_run_task_work_sig(); |
7112 | if (ret > 0) | |
4c6e277c | 7113 | continue; |
af9c1a44 | 7114 | else if (ret < 0) |
bda52162 | 7115 | break; |
ce593a6c JA |
7116 | if (io_should_wake(&iowq, false)) |
7117 | break; | |
c73ebb68 HX |
7118 | if (uts) { |
7119 | timeout = schedule_timeout(timeout); | |
7120 | if (timeout == 0) { | |
7121 | ret = -ETIME; | |
7122 | break; | |
7123 | } | |
7124 | } else { | |
7125 | schedule(); | |
7126 | } | |
bda52162 JA |
7127 | } while (1); |
7128 | finish_wait(&ctx->wait, &iowq.wq); | |
7129 | ||
b7db41c9 | 7130 | restore_saved_sigmask_unless(ret == -EINTR); |
2b188cc1 | 7131 | |
75b28aff | 7132 | return READ_ONCE(rings->cq.head) == READ_ONCE(rings->cq.tail) ? ret : 0; |
2b188cc1 JA |
7133 | } |
7134 | ||
6b06314c JA |
7135 | static void __io_sqe_files_unregister(struct io_ring_ctx *ctx) |
7136 | { | |
7137 | #if defined(CONFIG_UNIX) | |
7138 | if (ctx->ring_sock) { | |
7139 | struct sock *sock = ctx->ring_sock->sk; | |
7140 | struct sk_buff *skb; | |
7141 | ||
7142 | while ((skb = skb_dequeue(&sock->sk_receive_queue)) != NULL) | |
7143 | kfree_skb(skb); | |
7144 | } | |
7145 | #else | |
7146 | int i; | |
7147 | ||
65e19f54 JA |
7148 | for (i = 0; i < ctx->nr_user_files; i++) { |
7149 | struct file *file; | |
7150 | ||
7151 | file = io_file_from_index(ctx, i); | |
7152 | if (file) | |
7153 | fput(file); | |
7154 | } | |
6b06314c JA |
7155 | #endif |
7156 | } | |
7157 | ||
05f3fb3c JA |
7158 | static void io_file_ref_kill(struct percpu_ref *ref) |
7159 | { | |
7160 | struct fixed_file_data *data; | |
7161 | ||
7162 | data = container_of(ref, struct fixed_file_data, refs); | |
7163 | complete(&data->done); | |
7164 | } | |
7165 | ||
6b06314c JA |
7166 | static int io_sqe_files_unregister(struct io_ring_ctx *ctx) |
7167 | { | |
05f3fb3c | 7168 | struct fixed_file_data *data = ctx->file_data; |
05589553 | 7169 | struct fixed_file_ref_node *ref_node = NULL; |
65e19f54 JA |
7170 | unsigned nr_tables, i; |
7171 | ||
05f3fb3c | 7172 | if (!data) |
6b06314c JA |
7173 | return -ENXIO; |
7174 | ||
6a4d07cd | 7175 | spin_lock(&data->lock); |
1e5d770b | 7176 | ref_node = data->node; |
6a4d07cd | 7177 | spin_unlock(&data->lock); |
05589553 XW |
7178 | if (ref_node) |
7179 | percpu_ref_kill(&ref_node->refs); | |
7180 | ||
7181 | percpu_ref_kill(&data->refs); | |
7182 | ||
7183 | /* wait for all refs nodes to complete */ | |
4a38aed2 | 7184 | flush_delayed_work(&ctx->file_put_work); |
2faf852d | 7185 | wait_for_completion(&data->done); |
05f3fb3c | 7186 | |
6b06314c | 7187 | __io_sqe_files_unregister(ctx); |
65e19f54 JA |
7188 | nr_tables = DIV_ROUND_UP(ctx->nr_user_files, IORING_MAX_FILES_TABLE); |
7189 | for (i = 0; i < nr_tables; i++) | |
05f3fb3c JA |
7190 | kfree(data->table[i].files); |
7191 | kfree(data->table); | |
05589553 XW |
7192 | percpu_ref_exit(&data->refs); |
7193 | kfree(data); | |
05f3fb3c | 7194 | ctx->file_data = NULL; |
6b06314c JA |
7195 | ctx->nr_user_files = 0; |
7196 | return 0; | |
7197 | } | |
7198 | ||
534ca6d6 | 7199 | static void io_put_sq_data(struct io_sq_data *sqd) |
6c271ce2 | 7200 | { |
534ca6d6 | 7201 | if (refcount_dec_and_test(&sqd->refs)) { |
2bbcd6d3 RP |
7202 | /* |
7203 | * The park is a bit of a work-around, without it we get | |
7204 | * warning spews on shutdown with SQPOLL set and affinity | |
7205 | * set to a single CPU. | |
7206 | */ | |
534ca6d6 JA |
7207 | if (sqd->thread) { |
7208 | kthread_park(sqd->thread); | |
7209 | kthread_stop(sqd->thread); | |
7210 | } | |
7211 | ||
7212 | kfree(sqd); | |
7213 | } | |
7214 | } | |
7215 | ||
aa06165d JA |
7216 | static struct io_sq_data *io_attach_sq_data(struct io_uring_params *p) |
7217 | { | |
7218 | struct io_ring_ctx *ctx_attach; | |
7219 | struct io_sq_data *sqd; | |
7220 | struct fd f; | |
7221 | ||
7222 | f = fdget(p->wq_fd); | |
7223 | if (!f.file) | |
7224 | return ERR_PTR(-ENXIO); | |
7225 | if (f.file->f_op != &io_uring_fops) { | |
7226 | fdput(f); | |
7227 | return ERR_PTR(-EINVAL); | |
7228 | } | |
7229 | ||
7230 | ctx_attach = f.file->private_data; | |
7231 | sqd = ctx_attach->sq_data; | |
7232 | if (!sqd) { | |
7233 | fdput(f); | |
7234 | return ERR_PTR(-EINVAL); | |
7235 | } | |
7236 | ||
7237 | refcount_inc(&sqd->refs); | |
7238 | fdput(f); | |
7239 | return sqd; | |
7240 | } | |
7241 | ||
534ca6d6 JA |
7242 | static struct io_sq_data *io_get_sq_data(struct io_uring_params *p) |
7243 | { | |
7244 | struct io_sq_data *sqd; | |
7245 | ||
aa06165d JA |
7246 | if (p->flags & IORING_SETUP_ATTACH_WQ) |
7247 | return io_attach_sq_data(p); | |
7248 | ||
534ca6d6 JA |
7249 | sqd = kzalloc(sizeof(*sqd), GFP_KERNEL); |
7250 | if (!sqd) | |
7251 | return ERR_PTR(-ENOMEM); | |
7252 | ||
7253 | refcount_set(&sqd->refs, 1); | |
69fb2131 JA |
7254 | INIT_LIST_HEAD(&sqd->ctx_list); |
7255 | INIT_LIST_HEAD(&sqd->ctx_new_list); | |
7256 | mutex_init(&sqd->ctx_lock); | |
7257 | mutex_init(&sqd->lock); | |
534ca6d6 JA |
7258 | init_waitqueue_head(&sqd->wait); |
7259 | return sqd; | |
7260 | } | |
7261 | ||
69fb2131 JA |
7262 | static void io_sq_thread_unpark(struct io_sq_data *sqd) |
7263 | __releases(&sqd->lock) | |
7264 | { | |
7265 | if (!sqd->thread) | |
7266 | return; | |
7267 | kthread_unpark(sqd->thread); | |
7268 | mutex_unlock(&sqd->lock); | |
7269 | } | |
7270 | ||
7271 | static void io_sq_thread_park(struct io_sq_data *sqd) | |
7272 | __acquires(&sqd->lock) | |
7273 | { | |
7274 | if (!sqd->thread) | |
7275 | return; | |
7276 | mutex_lock(&sqd->lock); | |
7277 | kthread_park(sqd->thread); | |
7278 | } | |
7279 | ||
534ca6d6 JA |
7280 | static void io_sq_thread_stop(struct io_ring_ctx *ctx) |
7281 | { | |
7282 | struct io_sq_data *sqd = ctx->sq_data; | |
7283 | ||
7284 | if (sqd) { | |
7285 | if (sqd->thread) { | |
7286 | /* | |
7287 | * We may arrive here from the error branch in | |
7288 | * io_sq_offload_create() where the kthread is created | |
7289 | * without being waked up, thus wake it up now to make | |
7290 | * sure the wait will complete. | |
7291 | */ | |
7292 | wake_up_process(sqd->thread); | |
7293 | wait_for_completion(&ctx->sq_thread_comp); | |
69fb2131 JA |
7294 | |
7295 | io_sq_thread_park(sqd); | |
7296 | } | |
7297 | ||
7298 | mutex_lock(&sqd->ctx_lock); | |
7299 | list_del(&ctx->sqd_list); | |
08369246 | 7300 | io_sqd_update_thread_idle(sqd); |
69fb2131 JA |
7301 | mutex_unlock(&sqd->ctx_lock); |
7302 | ||
08369246 | 7303 | if (sqd->thread) |
69fb2131 | 7304 | io_sq_thread_unpark(sqd); |
534ca6d6 JA |
7305 | |
7306 | io_put_sq_data(sqd); | |
7307 | ctx->sq_data = NULL; | |
6c271ce2 JA |
7308 | } |
7309 | } | |
7310 | ||
6b06314c JA |
7311 | static void io_finish_async(struct io_ring_ctx *ctx) |
7312 | { | |
6c271ce2 JA |
7313 | io_sq_thread_stop(ctx); |
7314 | ||
561fb04a JA |
7315 | if (ctx->io_wq) { |
7316 | io_wq_destroy(ctx->io_wq); | |
7317 | ctx->io_wq = NULL; | |
6b06314c JA |
7318 | } |
7319 | } | |
7320 | ||
7321 | #if defined(CONFIG_UNIX) | |
6b06314c JA |
7322 | /* |
7323 | * Ensure the UNIX gc is aware of our file set, so we are certain that | |
7324 | * the io_uring can be safely unregistered on process exit, even if we have | |
7325 | * loops in the file referencing. | |
7326 | */ | |
7327 | static int __io_sqe_files_scm(struct io_ring_ctx *ctx, int nr, int offset) | |
7328 | { | |
7329 | struct sock *sk = ctx->ring_sock->sk; | |
7330 | struct scm_fp_list *fpl; | |
7331 | struct sk_buff *skb; | |
08a45173 | 7332 | int i, nr_files; |
6b06314c | 7333 | |
6b06314c JA |
7334 | fpl = kzalloc(sizeof(*fpl), GFP_KERNEL); |
7335 | if (!fpl) | |
7336 | return -ENOMEM; | |
7337 | ||
7338 | skb = alloc_skb(0, GFP_KERNEL); | |
7339 | if (!skb) { | |
7340 | kfree(fpl); | |
7341 | return -ENOMEM; | |
7342 | } | |
7343 | ||
7344 | skb->sk = sk; | |
6b06314c | 7345 | |
08a45173 | 7346 | nr_files = 0; |
6b06314c JA |
7347 | fpl->user = get_uid(ctx->user); |
7348 | for (i = 0; i < nr; i++) { | |
65e19f54 JA |
7349 | struct file *file = io_file_from_index(ctx, i + offset); |
7350 | ||
7351 | if (!file) | |
08a45173 | 7352 | continue; |
65e19f54 | 7353 | fpl->fp[nr_files] = get_file(file); |
08a45173 JA |
7354 | unix_inflight(fpl->user, fpl->fp[nr_files]); |
7355 | nr_files++; | |
6b06314c JA |
7356 | } |
7357 | ||
08a45173 JA |
7358 | if (nr_files) { |
7359 | fpl->max = SCM_MAX_FD; | |
7360 | fpl->count = nr_files; | |
7361 | UNIXCB(skb).fp = fpl; | |
05f3fb3c | 7362 | skb->destructor = unix_destruct_scm; |
08a45173 JA |
7363 | refcount_add(skb->truesize, &sk->sk_wmem_alloc); |
7364 | skb_queue_head(&sk->sk_receive_queue, skb); | |
6b06314c | 7365 | |
08a45173 JA |
7366 | for (i = 0; i < nr_files; i++) |
7367 | fput(fpl->fp[i]); | |
7368 | } else { | |
7369 | kfree_skb(skb); | |
7370 | kfree(fpl); | |
7371 | } | |
6b06314c JA |
7372 | |
7373 | return 0; | |
7374 | } | |
7375 | ||
7376 | /* | |
7377 | * If UNIX sockets are enabled, fd passing can cause a reference cycle which | |
7378 | * causes regular reference counting to break down. We rely on the UNIX | |
7379 | * garbage collection to take care of this problem for us. | |
7380 | */ | |
7381 | static int io_sqe_files_scm(struct io_ring_ctx *ctx) | |
7382 | { | |
7383 | unsigned left, total; | |
7384 | int ret = 0; | |
7385 | ||
7386 | total = 0; | |
7387 | left = ctx->nr_user_files; | |
7388 | while (left) { | |
7389 | unsigned this_files = min_t(unsigned, left, SCM_MAX_FD); | |
6b06314c JA |
7390 | |
7391 | ret = __io_sqe_files_scm(ctx, this_files, total); | |
7392 | if (ret) | |
7393 | break; | |
7394 | left -= this_files; | |
7395 | total += this_files; | |
7396 | } | |
7397 | ||
7398 | if (!ret) | |
7399 | return 0; | |
7400 | ||
7401 | while (total < ctx->nr_user_files) { | |
65e19f54 JA |
7402 | struct file *file = io_file_from_index(ctx, total); |
7403 | ||
7404 | if (file) | |
7405 | fput(file); | |
6b06314c JA |
7406 | total++; |
7407 | } | |
7408 | ||
7409 | return ret; | |
7410 | } | |
7411 | #else | |
7412 | static int io_sqe_files_scm(struct io_ring_ctx *ctx) | |
7413 | { | |
7414 | return 0; | |
7415 | } | |
7416 | #endif | |
7417 | ||
5398ae69 PB |
7418 | static int io_sqe_alloc_file_tables(struct fixed_file_data *file_data, |
7419 | unsigned nr_tables, unsigned nr_files) | |
65e19f54 JA |
7420 | { |
7421 | int i; | |
7422 | ||
7423 | for (i = 0; i < nr_tables; i++) { | |
5398ae69 | 7424 | struct fixed_file_table *table = &file_data->table[i]; |
65e19f54 JA |
7425 | unsigned this_files; |
7426 | ||
7427 | this_files = min(nr_files, IORING_MAX_FILES_TABLE); | |
7428 | table->files = kcalloc(this_files, sizeof(struct file *), | |
7429 | GFP_KERNEL); | |
7430 | if (!table->files) | |
7431 | break; | |
7432 | nr_files -= this_files; | |
7433 | } | |
7434 | ||
7435 | if (i == nr_tables) | |
7436 | return 0; | |
7437 | ||
7438 | for (i = 0; i < nr_tables; i++) { | |
5398ae69 | 7439 | struct fixed_file_table *table = &file_data->table[i]; |
65e19f54 JA |
7440 | kfree(table->files); |
7441 | } | |
7442 | return 1; | |
7443 | } | |
7444 | ||
05f3fb3c JA |
7445 | static void io_ring_file_put(struct io_ring_ctx *ctx, struct file *file) |
7446 | { | |
7447 | #if defined(CONFIG_UNIX) | |
7448 | struct sock *sock = ctx->ring_sock->sk; | |
7449 | struct sk_buff_head list, *head = &sock->sk_receive_queue; | |
7450 | struct sk_buff *skb; | |
7451 | int i; | |
7452 | ||
7453 | __skb_queue_head_init(&list); | |
7454 | ||
7455 | /* | |
7456 | * Find the skb that holds this file in its SCM_RIGHTS. When found, | |
7457 | * remove this entry and rearrange the file array. | |
7458 | */ | |
7459 | skb = skb_dequeue(head); | |
7460 | while (skb) { | |
7461 | struct scm_fp_list *fp; | |
7462 | ||
7463 | fp = UNIXCB(skb).fp; | |
7464 | for (i = 0; i < fp->count; i++) { | |
7465 | int left; | |
7466 | ||
7467 | if (fp->fp[i] != file) | |
7468 | continue; | |
7469 | ||
7470 | unix_notinflight(fp->user, fp->fp[i]); | |
7471 | left = fp->count - 1 - i; | |
7472 | if (left) { | |
7473 | memmove(&fp->fp[i], &fp->fp[i + 1], | |
7474 | left * sizeof(struct file *)); | |
7475 | } | |
7476 | fp->count--; | |
7477 | if (!fp->count) { | |
7478 | kfree_skb(skb); | |
7479 | skb = NULL; | |
7480 | } else { | |
7481 | __skb_queue_tail(&list, skb); | |
7482 | } | |
7483 | fput(file); | |
7484 | file = NULL; | |
7485 | break; | |
7486 | } | |
7487 | ||
7488 | if (!file) | |
7489 | break; | |
7490 | ||
7491 | __skb_queue_tail(&list, skb); | |
7492 | ||
7493 | skb = skb_dequeue(head); | |
7494 | } | |
7495 | ||
7496 | if (skb_peek(&list)) { | |
7497 | spin_lock_irq(&head->lock); | |
7498 | while ((skb = __skb_dequeue(&list)) != NULL) | |
7499 | __skb_queue_tail(head, skb); | |
7500 | spin_unlock_irq(&head->lock); | |
7501 | } | |
7502 | #else | |
7503 | fput(file); | |
7504 | #endif | |
7505 | } | |
7506 | ||
7507 | struct io_file_put { | |
05589553 | 7508 | struct list_head list; |
05f3fb3c | 7509 | struct file *file; |
05f3fb3c JA |
7510 | }; |
7511 | ||
4a38aed2 | 7512 | static void __io_file_put_work(struct fixed_file_ref_node *ref_node) |
65e19f54 | 7513 | { |
4a38aed2 JA |
7514 | struct fixed_file_data *file_data = ref_node->file_data; |
7515 | struct io_ring_ctx *ctx = file_data->ctx; | |
05f3fb3c | 7516 | struct io_file_put *pfile, *tmp; |
05589553 XW |
7517 | |
7518 | list_for_each_entry_safe(pfile, tmp, &ref_node->file_list, list) { | |
6a4d07cd | 7519 | list_del(&pfile->list); |
05589553 XW |
7520 | io_ring_file_put(ctx, pfile->file); |
7521 | kfree(pfile); | |
65e19f54 | 7522 | } |
05589553 | 7523 | |
05589553 XW |
7524 | percpu_ref_exit(&ref_node->refs); |
7525 | kfree(ref_node); | |
7526 | percpu_ref_put(&file_data->refs); | |
2faf852d | 7527 | } |
65e19f54 | 7528 | |
4a38aed2 JA |
7529 | static void io_file_put_work(struct work_struct *work) |
7530 | { | |
7531 | struct io_ring_ctx *ctx; | |
7532 | struct llist_node *node; | |
7533 | ||
7534 | ctx = container_of(work, struct io_ring_ctx, file_put_work.work); | |
7535 | node = llist_del_all(&ctx->file_put_llist); | |
7536 | ||
7537 | while (node) { | |
7538 | struct fixed_file_ref_node *ref_node; | |
7539 | struct llist_node *next = node->next; | |
7540 | ||
7541 | ref_node = llist_entry(node, struct fixed_file_ref_node, llist); | |
7542 | __io_file_put_work(ref_node); | |
7543 | node = next; | |
7544 | } | |
7545 | } | |
7546 | ||
05589553 | 7547 | static void io_file_data_ref_zero(struct percpu_ref *ref) |
2faf852d | 7548 | { |
05589553 | 7549 | struct fixed_file_ref_node *ref_node; |
e297822b | 7550 | struct fixed_file_data *data; |
4a38aed2 | 7551 | struct io_ring_ctx *ctx; |
e297822b | 7552 | bool first_add = false; |
4a38aed2 | 7553 | int delay = HZ; |
65e19f54 | 7554 | |
05589553 | 7555 | ref_node = container_of(ref, struct fixed_file_ref_node, refs); |
e297822b PB |
7556 | data = ref_node->file_data; |
7557 | ctx = data->ctx; | |
7558 | ||
7559 | spin_lock(&data->lock); | |
7560 | ref_node->done = true; | |
7561 | ||
7562 | while (!list_empty(&data->ref_list)) { | |
7563 | ref_node = list_first_entry(&data->ref_list, | |
7564 | struct fixed_file_ref_node, node); | |
7565 | /* recycle ref nodes in order */ | |
7566 | if (!ref_node->done) | |
7567 | break; | |
7568 | list_del(&ref_node->node); | |
7569 | first_add |= llist_add(&ref_node->llist, &ctx->file_put_llist); | |
7570 | } | |
7571 | spin_unlock(&data->lock); | |
05589553 | 7572 | |
e297822b | 7573 | if (percpu_ref_is_dying(&data->refs)) |
4a38aed2 | 7574 | delay = 0; |
05589553 | 7575 | |
4a38aed2 JA |
7576 | if (!delay) |
7577 | mod_delayed_work(system_wq, &ctx->file_put_work, 0); | |
7578 | else if (first_add) | |
7579 | queue_delayed_work(system_wq, &ctx->file_put_work, delay); | |
05f3fb3c | 7580 | } |
65e19f54 | 7581 | |
05589553 XW |
7582 | static struct fixed_file_ref_node *alloc_fixed_file_ref_node( |
7583 | struct io_ring_ctx *ctx) | |
05f3fb3c | 7584 | { |
05589553 | 7585 | struct fixed_file_ref_node *ref_node; |
05f3fb3c | 7586 | |
05589553 XW |
7587 | ref_node = kzalloc(sizeof(*ref_node), GFP_KERNEL); |
7588 | if (!ref_node) | |
7589 | return ERR_PTR(-ENOMEM); | |
05f3fb3c | 7590 | |
05589553 XW |
7591 | if (percpu_ref_init(&ref_node->refs, io_file_data_ref_zero, |
7592 | 0, GFP_KERNEL)) { | |
7593 | kfree(ref_node); | |
7594 | return ERR_PTR(-ENOMEM); | |
7595 | } | |
7596 | INIT_LIST_HEAD(&ref_node->node); | |
7597 | INIT_LIST_HEAD(&ref_node->file_list); | |
05589553 | 7598 | ref_node->file_data = ctx->file_data; |
e297822b | 7599 | ref_node->done = false; |
05589553 | 7600 | return ref_node; |
05589553 XW |
7601 | } |
7602 | ||
7603 | static void destroy_fixed_file_ref_node(struct fixed_file_ref_node *ref_node) | |
7604 | { | |
7605 | percpu_ref_exit(&ref_node->refs); | |
7606 | kfree(ref_node); | |
65e19f54 JA |
7607 | } |
7608 | ||
6b06314c JA |
7609 | static int io_sqe_files_register(struct io_ring_ctx *ctx, void __user *arg, |
7610 | unsigned nr_args) | |
7611 | { | |
7612 | __s32 __user *fds = (__s32 __user *) arg; | |
600cf3f8 | 7613 | unsigned nr_tables, i; |
05f3fb3c | 7614 | struct file *file; |
600cf3f8 | 7615 | int fd, ret = -ENOMEM; |
05589553 | 7616 | struct fixed_file_ref_node *ref_node; |
5398ae69 | 7617 | struct fixed_file_data *file_data; |
6b06314c | 7618 | |
05f3fb3c | 7619 | if (ctx->file_data) |
6b06314c JA |
7620 | return -EBUSY; |
7621 | if (!nr_args) | |
7622 | return -EINVAL; | |
7623 | if (nr_args > IORING_MAX_FIXED_FILES) | |
7624 | return -EMFILE; | |
7625 | ||
5398ae69 PB |
7626 | file_data = kzalloc(sizeof(*ctx->file_data), GFP_KERNEL); |
7627 | if (!file_data) | |
05f3fb3c | 7628 | return -ENOMEM; |
5398ae69 PB |
7629 | file_data->ctx = ctx; |
7630 | init_completion(&file_data->done); | |
7631 | INIT_LIST_HEAD(&file_data->ref_list); | |
7632 | spin_lock_init(&file_data->lock); | |
05f3fb3c | 7633 | |
65e19f54 | 7634 | nr_tables = DIV_ROUND_UP(nr_args, IORING_MAX_FILES_TABLE); |
035fbafc | 7635 | file_data->table = kcalloc(nr_tables, sizeof(*file_data->table), |
5398ae69 | 7636 | GFP_KERNEL); |
600cf3f8 PB |
7637 | if (!file_data->table) |
7638 | goto out_free; | |
05f3fb3c | 7639 | |
5398ae69 | 7640 | if (percpu_ref_init(&file_data->refs, io_file_ref_kill, |
600cf3f8 PB |
7641 | PERCPU_REF_ALLOW_REINIT, GFP_KERNEL)) |
7642 | goto out_free; | |
6b06314c | 7643 | |
600cf3f8 PB |
7644 | if (io_sqe_alloc_file_tables(file_data, nr_tables, nr_args)) |
7645 | goto out_ref; | |
55cbc256 | 7646 | ctx->file_data = file_data; |
65e19f54 | 7647 | |
08a45173 | 7648 | for (i = 0; i < nr_args; i++, ctx->nr_user_files++) { |
65e19f54 JA |
7649 | struct fixed_file_table *table; |
7650 | unsigned index; | |
7651 | ||
600cf3f8 PB |
7652 | if (copy_from_user(&fd, &fds[i], sizeof(fd))) { |
7653 | ret = -EFAULT; | |
7654 | goto out_fput; | |
7655 | } | |
08a45173 | 7656 | /* allow sparse sets */ |
600cf3f8 | 7657 | if (fd == -1) |
08a45173 | 7658 | continue; |
6b06314c | 7659 | |
05f3fb3c | 7660 | file = fget(fd); |
6b06314c | 7661 | ret = -EBADF; |
05f3fb3c | 7662 | if (!file) |
600cf3f8 | 7663 | goto out_fput; |
05f3fb3c | 7664 | |
6b06314c JA |
7665 | /* |
7666 | * Don't allow io_uring instances to be registered. If UNIX | |
7667 | * isn't enabled, then this causes a reference cycle and this | |
7668 | * instance can never get freed. If UNIX is enabled we'll | |
7669 | * handle it just fine, but there's still no point in allowing | |
7670 | * a ring fd as it doesn't support regular read/write anyway. | |
7671 | */ | |
05f3fb3c JA |
7672 | if (file->f_op == &io_uring_fops) { |
7673 | fput(file); | |
600cf3f8 | 7674 | goto out_fput; |
6b06314c | 7675 | } |
600cf3f8 PB |
7676 | table = &file_data->table[i >> IORING_FILE_TABLE_SHIFT]; |
7677 | index = i & IORING_FILE_TABLE_MASK; | |
05f3fb3c | 7678 | table->files[index] = file; |
6b06314c JA |
7679 | } |
7680 | ||
6b06314c | 7681 | ret = io_sqe_files_scm(ctx); |
05589553 | 7682 | if (ret) { |
6b06314c | 7683 | io_sqe_files_unregister(ctx); |
05589553 XW |
7684 | return ret; |
7685 | } | |
6b06314c | 7686 | |
05589553 XW |
7687 | ref_node = alloc_fixed_file_ref_node(ctx); |
7688 | if (IS_ERR(ref_node)) { | |
7689 | io_sqe_files_unregister(ctx); | |
7690 | return PTR_ERR(ref_node); | |
7691 | } | |
7692 | ||
b2e96852 | 7693 | file_data->node = ref_node; |
5398ae69 | 7694 | spin_lock(&file_data->lock); |
e297822b | 7695 | list_add_tail(&ref_node->node, &file_data->ref_list); |
5398ae69 PB |
7696 | spin_unlock(&file_data->lock); |
7697 | percpu_ref_get(&file_data->refs); | |
6b06314c | 7698 | return ret; |
600cf3f8 PB |
7699 | out_fput: |
7700 | for (i = 0; i < ctx->nr_user_files; i++) { | |
7701 | file = io_file_from_index(ctx, i); | |
7702 | if (file) | |
7703 | fput(file); | |
7704 | } | |
7705 | for (i = 0; i < nr_tables; i++) | |
7706 | kfree(file_data->table[i].files); | |
7707 | ctx->nr_user_files = 0; | |
7708 | out_ref: | |
7709 | percpu_ref_exit(&file_data->refs); | |
7710 | out_free: | |
7711 | kfree(file_data->table); | |
7712 | kfree(file_data); | |
55cbc256 | 7713 | ctx->file_data = NULL; |
6b06314c JA |
7714 | return ret; |
7715 | } | |
7716 | ||
c3a31e60 JA |
7717 | static int io_sqe_file_register(struct io_ring_ctx *ctx, struct file *file, |
7718 | int index) | |
7719 | { | |
7720 | #if defined(CONFIG_UNIX) | |
7721 | struct sock *sock = ctx->ring_sock->sk; | |
7722 | struct sk_buff_head *head = &sock->sk_receive_queue; | |
7723 | struct sk_buff *skb; | |
7724 | ||
7725 | /* | |
7726 | * See if we can merge this file into an existing skb SCM_RIGHTS | |
7727 | * file set. If there's no room, fall back to allocating a new skb | |
7728 | * and filling it in. | |
7729 | */ | |
7730 | spin_lock_irq(&head->lock); | |
7731 | skb = skb_peek(head); | |
7732 | if (skb) { | |
7733 | struct scm_fp_list *fpl = UNIXCB(skb).fp; | |
7734 | ||
7735 | if (fpl->count < SCM_MAX_FD) { | |
7736 | __skb_unlink(skb, head); | |
7737 | spin_unlock_irq(&head->lock); | |
7738 | fpl->fp[fpl->count] = get_file(file); | |
7739 | unix_inflight(fpl->user, fpl->fp[fpl->count]); | |
7740 | fpl->count++; | |
7741 | spin_lock_irq(&head->lock); | |
7742 | __skb_queue_head(head, skb); | |
7743 | } else { | |
7744 | skb = NULL; | |
7745 | } | |
7746 | } | |
7747 | spin_unlock_irq(&head->lock); | |
7748 | ||
7749 | if (skb) { | |
7750 | fput(file); | |
7751 | return 0; | |
7752 | } | |
7753 | ||
7754 | return __io_sqe_files_scm(ctx, 1, index); | |
7755 | #else | |
7756 | return 0; | |
7757 | #endif | |
7758 | } | |
7759 | ||
a5318d3c | 7760 | static int io_queue_file_removal(struct fixed_file_data *data, |
05589553 | 7761 | struct file *file) |
05f3fb3c | 7762 | { |
a5318d3c | 7763 | struct io_file_put *pfile; |
b2e96852 | 7764 | struct fixed_file_ref_node *ref_node = data->node; |
05f3fb3c | 7765 | |
05f3fb3c | 7766 | pfile = kzalloc(sizeof(*pfile), GFP_KERNEL); |
a5318d3c HD |
7767 | if (!pfile) |
7768 | return -ENOMEM; | |
05f3fb3c JA |
7769 | |
7770 | pfile->file = file; | |
05589553 XW |
7771 | list_add(&pfile->list, &ref_node->file_list); |
7772 | ||
a5318d3c | 7773 | return 0; |
05f3fb3c JA |
7774 | } |
7775 | ||
7776 | static int __io_sqe_files_update(struct io_ring_ctx *ctx, | |
7777 | struct io_uring_files_update *up, | |
7778 | unsigned nr_args) | |
7779 | { | |
7780 | struct fixed_file_data *data = ctx->file_data; | |
05589553 | 7781 | struct fixed_file_ref_node *ref_node; |
05f3fb3c | 7782 | struct file *file; |
c3a31e60 JA |
7783 | __s32 __user *fds; |
7784 | int fd, i, err; | |
7785 | __u32 done; | |
05589553 | 7786 | bool needs_switch = false; |
c3a31e60 | 7787 | |
05f3fb3c | 7788 | if (check_add_overflow(up->offset, nr_args, &done)) |
c3a31e60 JA |
7789 | return -EOVERFLOW; |
7790 | if (done > ctx->nr_user_files) | |
7791 | return -EINVAL; | |
7792 | ||
05589553 XW |
7793 | ref_node = alloc_fixed_file_ref_node(ctx); |
7794 | if (IS_ERR(ref_node)) | |
7795 | return PTR_ERR(ref_node); | |
7796 | ||
c3a31e60 | 7797 | done = 0; |
05f3fb3c | 7798 | fds = u64_to_user_ptr(up->fds); |
c3a31e60 | 7799 | while (nr_args) { |
65e19f54 JA |
7800 | struct fixed_file_table *table; |
7801 | unsigned index; | |
7802 | ||
c3a31e60 JA |
7803 | err = 0; |
7804 | if (copy_from_user(&fd, &fds[done], sizeof(fd))) { | |
7805 | err = -EFAULT; | |
7806 | break; | |
7807 | } | |
05f3fb3c JA |
7808 | i = array_index_nospec(up->offset, ctx->nr_user_files); |
7809 | table = &ctx->file_data->table[i >> IORING_FILE_TABLE_SHIFT]; | |
65e19f54 JA |
7810 | index = i & IORING_FILE_TABLE_MASK; |
7811 | if (table->files[index]) { | |
98dfd502 | 7812 | file = table->files[index]; |
a5318d3c HD |
7813 | err = io_queue_file_removal(data, file); |
7814 | if (err) | |
7815 | break; | |
65e19f54 | 7816 | table->files[index] = NULL; |
05589553 | 7817 | needs_switch = true; |
c3a31e60 JA |
7818 | } |
7819 | if (fd != -1) { | |
c3a31e60 JA |
7820 | file = fget(fd); |
7821 | if (!file) { | |
7822 | err = -EBADF; | |
7823 | break; | |
7824 | } | |
7825 | /* | |
7826 | * Don't allow io_uring instances to be registered. If | |
7827 | * UNIX isn't enabled, then this causes a reference | |
7828 | * cycle and this instance can never get freed. If UNIX | |
7829 | * is enabled we'll handle it just fine, but there's | |
7830 | * still no point in allowing a ring fd as it doesn't | |
7831 | * support regular read/write anyway. | |
7832 | */ | |
7833 | if (file->f_op == &io_uring_fops) { | |
7834 | fput(file); | |
7835 | err = -EBADF; | |
7836 | break; | |
7837 | } | |
65e19f54 | 7838 | table->files[index] = file; |
c3a31e60 | 7839 | err = io_sqe_file_register(ctx, file, i); |
f3bd9dae | 7840 | if (err) { |
95d1c8e5 | 7841 | table->files[index] = NULL; |
f3bd9dae | 7842 | fput(file); |
c3a31e60 | 7843 | break; |
f3bd9dae | 7844 | } |
c3a31e60 JA |
7845 | } |
7846 | nr_args--; | |
7847 | done++; | |
05f3fb3c JA |
7848 | up->offset++; |
7849 | } | |
7850 | ||
05589553 | 7851 | if (needs_switch) { |
b2e96852 | 7852 | percpu_ref_kill(&data->node->refs); |
6a4d07cd | 7853 | spin_lock(&data->lock); |
e297822b | 7854 | list_add_tail(&ref_node->node, &data->ref_list); |
b2e96852 | 7855 | data->node = ref_node; |
6a4d07cd | 7856 | spin_unlock(&data->lock); |
05589553 XW |
7857 | percpu_ref_get(&ctx->file_data->refs); |
7858 | } else | |
7859 | destroy_fixed_file_ref_node(ref_node); | |
c3a31e60 JA |
7860 | |
7861 | return done ? done : err; | |
7862 | } | |
05589553 | 7863 | |
05f3fb3c JA |
7864 | static int io_sqe_files_update(struct io_ring_ctx *ctx, void __user *arg, |
7865 | unsigned nr_args) | |
7866 | { | |
7867 | struct io_uring_files_update up; | |
7868 | ||
7869 | if (!ctx->file_data) | |
7870 | return -ENXIO; | |
7871 | if (!nr_args) | |
7872 | return -EINVAL; | |
7873 | if (copy_from_user(&up, arg, sizeof(up))) | |
7874 | return -EFAULT; | |
7875 | if (up.resv) | |
7876 | return -EINVAL; | |
7877 | ||
7878 | return __io_sqe_files_update(ctx, &up, nr_args); | |
7879 | } | |
c3a31e60 | 7880 | |
e9fd9396 | 7881 | static void io_free_work(struct io_wq_work *work) |
7d723065 JA |
7882 | { |
7883 | struct io_kiocb *req = container_of(work, struct io_kiocb, work); | |
7884 | ||
e9fd9396 | 7885 | /* Consider that io_steal_work() relies on this ref */ |
7d723065 JA |
7886 | io_put_req(req); |
7887 | } | |
7888 | ||
24369c2e PB |
7889 | static int io_init_wq_offload(struct io_ring_ctx *ctx, |
7890 | struct io_uring_params *p) | |
7891 | { | |
7892 | struct io_wq_data data; | |
7893 | struct fd f; | |
7894 | struct io_ring_ctx *ctx_attach; | |
7895 | unsigned int concurrency; | |
7896 | int ret = 0; | |
7897 | ||
7898 | data.user = ctx->user; | |
e9fd9396 | 7899 | data.free_work = io_free_work; |
f5fa38c5 | 7900 | data.do_work = io_wq_submit_work; |
24369c2e PB |
7901 | |
7902 | if (!(p->flags & IORING_SETUP_ATTACH_WQ)) { | |
7903 | /* Do QD, or 4 * CPUS, whatever is smallest */ | |
7904 | concurrency = min(ctx->sq_entries, 4 * num_online_cpus()); | |
7905 | ||
7906 | ctx->io_wq = io_wq_create(concurrency, &data); | |
7907 | if (IS_ERR(ctx->io_wq)) { | |
7908 | ret = PTR_ERR(ctx->io_wq); | |
7909 | ctx->io_wq = NULL; | |
7910 | } | |
7911 | return ret; | |
7912 | } | |
7913 | ||
7914 | f = fdget(p->wq_fd); | |
7915 | if (!f.file) | |
7916 | return -EBADF; | |
7917 | ||
7918 | if (f.file->f_op != &io_uring_fops) { | |
7919 | ret = -EINVAL; | |
7920 | goto out_fput; | |
7921 | } | |
7922 | ||
7923 | ctx_attach = f.file->private_data; | |
7924 | /* @io_wq is protected by holding the fd */ | |
7925 | if (!io_wq_get(ctx_attach->io_wq, &data)) { | |
7926 | ret = -EINVAL; | |
7927 | goto out_fput; | |
7928 | } | |
7929 | ||
7930 | ctx->io_wq = ctx_attach->io_wq; | |
7931 | out_fput: | |
7932 | fdput(f); | |
7933 | return ret; | |
7934 | } | |
7935 | ||
0f212204 JA |
7936 | static int io_uring_alloc_task_context(struct task_struct *task) |
7937 | { | |
7938 | struct io_uring_task *tctx; | |
d8a6df10 | 7939 | int ret; |
0f212204 JA |
7940 | |
7941 | tctx = kmalloc(sizeof(*tctx), GFP_KERNEL); | |
7942 | if (unlikely(!tctx)) | |
7943 | return -ENOMEM; | |
7944 | ||
d8a6df10 JA |
7945 | ret = percpu_counter_init(&tctx->inflight, 0, GFP_KERNEL); |
7946 | if (unlikely(ret)) { | |
7947 | kfree(tctx); | |
7948 | return ret; | |
7949 | } | |
7950 | ||
0f212204 JA |
7951 | xa_init(&tctx->xa); |
7952 | init_waitqueue_head(&tctx->wait); | |
7953 | tctx->last = NULL; | |
fdaf083c JA |
7954 | atomic_set(&tctx->in_idle, 0); |
7955 | tctx->sqpoll = false; | |
500a373d JA |
7956 | io_init_identity(&tctx->__identity); |
7957 | tctx->identity = &tctx->__identity; | |
0f212204 JA |
7958 | task->io_uring = tctx; |
7959 | return 0; | |
7960 | } | |
7961 | ||
7962 | void __io_uring_free(struct task_struct *tsk) | |
7963 | { | |
7964 | struct io_uring_task *tctx = tsk->io_uring; | |
7965 | ||
7966 | WARN_ON_ONCE(!xa_empty(&tctx->xa)); | |
500a373d JA |
7967 | WARN_ON_ONCE(refcount_read(&tctx->identity->count) != 1); |
7968 | if (tctx->identity != &tctx->__identity) | |
7969 | kfree(tctx->identity); | |
d8a6df10 | 7970 | percpu_counter_destroy(&tctx->inflight); |
0f212204 JA |
7971 | kfree(tctx); |
7972 | tsk->io_uring = NULL; | |
7973 | } | |
7974 | ||
7e84e1c7 SG |
7975 | static int io_sq_offload_create(struct io_ring_ctx *ctx, |
7976 | struct io_uring_params *p) | |
2b188cc1 JA |
7977 | { |
7978 | int ret; | |
7979 | ||
6c271ce2 | 7980 | if (ctx->flags & IORING_SETUP_SQPOLL) { |
534ca6d6 JA |
7981 | struct io_sq_data *sqd; |
7982 | ||
3ec482d1 | 7983 | ret = -EPERM; |
ce59fc69 | 7984 | if (!capable(CAP_SYS_ADMIN) && !capable(CAP_SYS_NICE)) |
3ec482d1 JA |
7985 | goto err; |
7986 | ||
534ca6d6 JA |
7987 | sqd = io_get_sq_data(p); |
7988 | if (IS_ERR(sqd)) { | |
7989 | ret = PTR_ERR(sqd); | |
7990 | goto err; | |
7991 | } | |
69fb2131 | 7992 | |
534ca6d6 | 7993 | ctx->sq_data = sqd; |
69fb2131 JA |
7994 | io_sq_thread_park(sqd); |
7995 | mutex_lock(&sqd->ctx_lock); | |
7996 | list_add(&ctx->sqd_list, &sqd->ctx_new_list); | |
7997 | mutex_unlock(&sqd->ctx_lock); | |
7998 | io_sq_thread_unpark(sqd); | |
534ca6d6 | 7999 | |
917257da JA |
8000 | ctx->sq_thread_idle = msecs_to_jiffies(p->sq_thread_idle); |
8001 | if (!ctx->sq_thread_idle) | |
8002 | ctx->sq_thread_idle = HZ; | |
8003 | ||
aa06165d JA |
8004 | if (sqd->thread) |
8005 | goto done; | |
8006 | ||
6c271ce2 | 8007 | if (p->flags & IORING_SETUP_SQ_AFF) { |
44a9bd18 | 8008 | int cpu = p->sq_thread_cpu; |
6c271ce2 | 8009 | |
917257da | 8010 | ret = -EINVAL; |
44a9bd18 JA |
8011 | if (cpu >= nr_cpu_ids) |
8012 | goto err; | |
7889f44d | 8013 | if (!cpu_online(cpu)) |
917257da JA |
8014 | goto err; |
8015 | ||
69fb2131 | 8016 | sqd->thread = kthread_create_on_cpu(io_sq_thread, sqd, |
534ca6d6 | 8017 | cpu, "io_uring-sq"); |
6c271ce2 | 8018 | } else { |
69fb2131 | 8019 | sqd->thread = kthread_create(io_sq_thread, sqd, |
6c271ce2 JA |
8020 | "io_uring-sq"); |
8021 | } | |
534ca6d6 JA |
8022 | if (IS_ERR(sqd->thread)) { |
8023 | ret = PTR_ERR(sqd->thread); | |
8024 | sqd->thread = NULL; | |
6c271ce2 JA |
8025 | goto err; |
8026 | } | |
534ca6d6 | 8027 | ret = io_uring_alloc_task_context(sqd->thread); |
0f212204 JA |
8028 | if (ret) |
8029 | goto err; | |
6c271ce2 JA |
8030 | } else if (p->flags & IORING_SETUP_SQ_AFF) { |
8031 | /* Can't have SQ_AFF without SQPOLL */ | |
8032 | ret = -EINVAL; | |
8033 | goto err; | |
8034 | } | |
8035 | ||
aa06165d | 8036 | done: |
24369c2e PB |
8037 | ret = io_init_wq_offload(ctx, p); |
8038 | if (ret) | |
2b188cc1 | 8039 | goto err; |
2b188cc1 JA |
8040 | |
8041 | return 0; | |
8042 | err: | |
54a91f3b | 8043 | io_finish_async(ctx); |
2b188cc1 JA |
8044 | return ret; |
8045 | } | |
8046 | ||
7e84e1c7 SG |
8047 | static void io_sq_offload_start(struct io_ring_ctx *ctx) |
8048 | { | |
534ca6d6 JA |
8049 | struct io_sq_data *sqd = ctx->sq_data; |
8050 | ||
8051 | if ((ctx->flags & IORING_SETUP_SQPOLL) && sqd->thread) | |
8052 | wake_up_process(sqd->thread); | |
7e84e1c7 SG |
8053 | } |
8054 | ||
a087e2b5 BM |
8055 | static inline void __io_unaccount_mem(struct user_struct *user, |
8056 | unsigned long nr_pages) | |
2b188cc1 JA |
8057 | { |
8058 | atomic_long_sub(nr_pages, &user->locked_vm); | |
8059 | } | |
8060 | ||
a087e2b5 BM |
8061 | static inline int __io_account_mem(struct user_struct *user, |
8062 | unsigned long nr_pages) | |
2b188cc1 JA |
8063 | { |
8064 | unsigned long page_limit, cur_pages, new_pages; | |
8065 | ||
8066 | /* Don't allow more pages than we can safely lock */ | |
8067 | page_limit = rlimit(RLIMIT_MEMLOCK) >> PAGE_SHIFT; | |
8068 | ||
8069 | do { | |
8070 | cur_pages = atomic_long_read(&user->locked_vm); | |
8071 | new_pages = cur_pages + nr_pages; | |
8072 | if (new_pages > page_limit) | |
8073 | return -ENOMEM; | |
8074 | } while (atomic_long_cmpxchg(&user->locked_vm, cur_pages, | |
8075 | new_pages) != cur_pages); | |
8076 | ||
8077 | return 0; | |
8078 | } | |
8079 | ||
2e0464d4 BM |
8080 | static void io_unaccount_mem(struct io_ring_ctx *ctx, unsigned long nr_pages, |
8081 | enum io_mem_account acct) | |
a087e2b5 | 8082 | { |
aad5d8da | 8083 | if (ctx->limit_mem) |
a087e2b5 | 8084 | __io_unaccount_mem(ctx->user, nr_pages); |
30975825 | 8085 | |
2aede0e4 | 8086 | if (ctx->mm_account) { |
2e0464d4 | 8087 | if (acct == ACCT_LOCKED) |
2aede0e4 | 8088 | ctx->mm_account->locked_vm -= nr_pages; |
2e0464d4 | 8089 | else if (acct == ACCT_PINNED) |
2aede0e4 | 8090 | atomic64_sub(nr_pages, &ctx->mm_account->pinned_vm); |
2e0464d4 | 8091 | } |
a087e2b5 BM |
8092 | } |
8093 | ||
2e0464d4 BM |
8094 | static int io_account_mem(struct io_ring_ctx *ctx, unsigned long nr_pages, |
8095 | enum io_mem_account acct) | |
a087e2b5 | 8096 | { |
30975825 BM |
8097 | int ret; |
8098 | ||
8099 | if (ctx->limit_mem) { | |
8100 | ret = __io_account_mem(ctx->user, nr_pages); | |
8101 | if (ret) | |
8102 | return ret; | |
8103 | } | |
8104 | ||
2aede0e4 | 8105 | if (ctx->mm_account) { |
2e0464d4 | 8106 | if (acct == ACCT_LOCKED) |
2aede0e4 | 8107 | ctx->mm_account->locked_vm += nr_pages; |
2e0464d4 | 8108 | else if (acct == ACCT_PINNED) |
2aede0e4 | 8109 | atomic64_add(nr_pages, &ctx->mm_account->pinned_vm); |
2e0464d4 | 8110 | } |
a087e2b5 BM |
8111 | |
8112 | return 0; | |
8113 | } | |
8114 | ||
2b188cc1 JA |
8115 | static void io_mem_free(void *ptr) |
8116 | { | |
52e04ef4 MR |
8117 | struct page *page; |
8118 | ||
8119 | if (!ptr) | |
8120 | return; | |
2b188cc1 | 8121 | |
52e04ef4 | 8122 | page = virt_to_head_page(ptr); |
2b188cc1 JA |
8123 | if (put_page_testzero(page)) |
8124 | free_compound_page(page); | |
8125 | } | |
8126 | ||
8127 | static void *io_mem_alloc(size_t size) | |
8128 | { | |
8129 | gfp_t gfp_flags = GFP_KERNEL | __GFP_ZERO | __GFP_NOWARN | __GFP_COMP | | |
8130 | __GFP_NORETRY; | |
8131 | ||
8132 | return (void *) __get_free_pages(gfp_flags, get_order(size)); | |
8133 | } | |
8134 | ||
75b28aff HV |
8135 | static unsigned long rings_size(unsigned sq_entries, unsigned cq_entries, |
8136 | size_t *sq_offset) | |
8137 | { | |
8138 | struct io_rings *rings; | |
8139 | size_t off, sq_array_size; | |
8140 | ||
8141 | off = struct_size(rings, cqes, cq_entries); | |
8142 | if (off == SIZE_MAX) | |
8143 | return SIZE_MAX; | |
8144 | ||
8145 | #ifdef CONFIG_SMP | |
8146 | off = ALIGN(off, SMP_CACHE_BYTES); | |
8147 | if (off == 0) | |
8148 | return SIZE_MAX; | |
8149 | #endif | |
8150 | ||
b36200f5 DV |
8151 | if (sq_offset) |
8152 | *sq_offset = off; | |
8153 | ||
75b28aff HV |
8154 | sq_array_size = array_size(sizeof(u32), sq_entries); |
8155 | if (sq_array_size == SIZE_MAX) | |
8156 | return SIZE_MAX; | |
8157 | ||
8158 | if (check_add_overflow(off, sq_array_size, &off)) | |
8159 | return SIZE_MAX; | |
8160 | ||
75b28aff HV |
8161 | return off; |
8162 | } | |
8163 | ||
2b188cc1 JA |
8164 | static unsigned long ring_pages(unsigned sq_entries, unsigned cq_entries) |
8165 | { | |
75b28aff | 8166 | size_t pages; |
2b188cc1 | 8167 | |
75b28aff HV |
8168 | pages = (size_t)1 << get_order( |
8169 | rings_size(sq_entries, cq_entries, NULL)); | |
8170 | pages += (size_t)1 << get_order( | |
8171 | array_size(sizeof(struct io_uring_sqe), sq_entries)); | |
2b188cc1 | 8172 | |
75b28aff | 8173 | return pages; |
2b188cc1 JA |
8174 | } |
8175 | ||
edafccee JA |
8176 | static int io_sqe_buffer_unregister(struct io_ring_ctx *ctx) |
8177 | { | |
8178 | int i, j; | |
8179 | ||
8180 | if (!ctx->user_bufs) | |
8181 | return -ENXIO; | |
8182 | ||
8183 | for (i = 0; i < ctx->nr_user_bufs; i++) { | |
8184 | struct io_mapped_ubuf *imu = &ctx->user_bufs[i]; | |
8185 | ||
8186 | for (j = 0; j < imu->nr_bvecs; j++) | |
f1f6a7dd | 8187 | unpin_user_page(imu->bvec[j].bv_page); |
edafccee | 8188 | |
de293938 JA |
8189 | if (imu->acct_pages) |
8190 | io_unaccount_mem(ctx, imu->acct_pages, ACCT_PINNED); | |
d4ef6475 | 8191 | kvfree(imu->bvec); |
edafccee JA |
8192 | imu->nr_bvecs = 0; |
8193 | } | |
8194 | ||
8195 | kfree(ctx->user_bufs); | |
8196 | ctx->user_bufs = NULL; | |
8197 | ctx->nr_user_bufs = 0; | |
8198 | return 0; | |
8199 | } | |
8200 | ||
8201 | static int io_copy_iov(struct io_ring_ctx *ctx, struct iovec *dst, | |
8202 | void __user *arg, unsigned index) | |
8203 | { | |
8204 | struct iovec __user *src; | |
8205 | ||
8206 | #ifdef CONFIG_COMPAT | |
8207 | if (ctx->compat) { | |
8208 | struct compat_iovec __user *ciovs; | |
8209 | struct compat_iovec ciov; | |
8210 | ||
8211 | ciovs = (struct compat_iovec __user *) arg; | |
8212 | if (copy_from_user(&ciov, &ciovs[index], sizeof(ciov))) | |
8213 | return -EFAULT; | |
8214 | ||
d55e5f5b | 8215 | dst->iov_base = u64_to_user_ptr((u64)ciov.iov_base); |
edafccee JA |
8216 | dst->iov_len = ciov.iov_len; |
8217 | return 0; | |
8218 | } | |
8219 | #endif | |
8220 | src = (struct iovec __user *) arg; | |
8221 | if (copy_from_user(dst, &src[index], sizeof(*dst))) | |
8222 | return -EFAULT; | |
8223 | return 0; | |
8224 | } | |
8225 | ||
de293938 JA |
8226 | /* |
8227 | * Not super efficient, but this is just a registration time. And we do cache | |
8228 | * the last compound head, so generally we'll only do a full search if we don't | |
8229 | * match that one. | |
8230 | * | |
8231 | * We check if the given compound head page has already been accounted, to | |
8232 | * avoid double accounting it. This allows us to account the full size of the | |
8233 | * page, not just the constituent pages of a huge page. | |
8234 | */ | |
8235 | static bool headpage_already_acct(struct io_ring_ctx *ctx, struct page **pages, | |
8236 | int nr_pages, struct page *hpage) | |
8237 | { | |
8238 | int i, j; | |
8239 | ||
8240 | /* check current page array */ | |
8241 | for (i = 0; i < nr_pages; i++) { | |
8242 | if (!PageCompound(pages[i])) | |
8243 | continue; | |
8244 | if (compound_head(pages[i]) == hpage) | |
8245 | return true; | |
8246 | } | |
8247 | ||
8248 | /* check previously registered pages */ | |
8249 | for (i = 0; i < ctx->nr_user_bufs; i++) { | |
8250 | struct io_mapped_ubuf *imu = &ctx->user_bufs[i]; | |
8251 | ||
8252 | for (j = 0; j < imu->nr_bvecs; j++) { | |
8253 | if (!PageCompound(imu->bvec[j].bv_page)) | |
8254 | continue; | |
8255 | if (compound_head(imu->bvec[j].bv_page) == hpage) | |
8256 | return true; | |
8257 | } | |
8258 | } | |
8259 | ||
8260 | return false; | |
8261 | } | |
8262 | ||
8263 | static int io_buffer_account_pin(struct io_ring_ctx *ctx, struct page **pages, | |
8264 | int nr_pages, struct io_mapped_ubuf *imu, | |
8265 | struct page **last_hpage) | |
8266 | { | |
8267 | int i, ret; | |
8268 | ||
8269 | for (i = 0; i < nr_pages; i++) { | |
8270 | if (!PageCompound(pages[i])) { | |
8271 | imu->acct_pages++; | |
8272 | } else { | |
8273 | struct page *hpage; | |
8274 | ||
8275 | hpage = compound_head(pages[i]); | |
8276 | if (hpage == *last_hpage) | |
8277 | continue; | |
8278 | *last_hpage = hpage; | |
8279 | if (headpage_already_acct(ctx, pages, i, hpage)) | |
8280 | continue; | |
8281 | imu->acct_pages += page_size(hpage) >> PAGE_SHIFT; | |
8282 | } | |
8283 | } | |
8284 | ||
8285 | if (!imu->acct_pages) | |
8286 | return 0; | |
8287 | ||
8288 | ret = io_account_mem(ctx, imu->acct_pages, ACCT_PINNED); | |
8289 | if (ret) | |
8290 | imu->acct_pages = 0; | |
8291 | return ret; | |
8292 | } | |
8293 | ||
edafccee JA |
8294 | static int io_sqe_buffer_register(struct io_ring_ctx *ctx, void __user *arg, |
8295 | unsigned nr_args) | |
8296 | { | |
8297 | struct vm_area_struct **vmas = NULL; | |
8298 | struct page **pages = NULL; | |
de293938 | 8299 | struct page *last_hpage = NULL; |
edafccee JA |
8300 | int i, j, got_pages = 0; |
8301 | int ret = -EINVAL; | |
8302 | ||
8303 | if (ctx->user_bufs) | |
8304 | return -EBUSY; | |
8305 | if (!nr_args || nr_args > UIO_MAXIOV) | |
8306 | return -EINVAL; | |
8307 | ||
8308 | ctx->user_bufs = kcalloc(nr_args, sizeof(struct io_mapped_ubuf), | |
8309 | GFP_KERNEL); | |
8310 | if (!ctx->user_bufs) | |
8311 | return -ENOMEM; | |
8312 | ||
8313 | for (i = 0; i < nr_args; i++) { | |
8314 | struct io_mapped_ubuf *imu = &ctx->user_bufs[i]; | |
8315 | unsigned long off, start, end, ubuf; | |
8316 | int pret, nr_pages; | |
8317 | struct iovec iov; | |
8318 | size_t size; | |
8319 | ||
8320 | ret = io_copy_iov(ctx, &iov, arg, i); | |
8321 | if (ret) | |
a278682d | 8322 | goto err; |
edafccee JA |
8323 | |
8324 | /* | |
8325 | * Don't impose further limits on the size and buffer | |
8326 | * constraints here, we'll -EINVAL later when IO is | |
8327 | * submitted if they are wrong. | |
8328 | */ | |
8329 | ret = -EFAULT; | |
8330 | if (!iov.iov_base || !iov.iov_len) | |
8331 | goto err; | |
8332 | ||
8333 | /* arbitrary limit, but we need something */ | |
8334 | if (iov.iov_len > SZ_1G) | |
8335 | goto err; | |
8336 | ||
8337 | ubuf = (unsigned long) iov.iov_base; | |
8338 | end = (ubuf + iov.iov_len + PAGE_SIZE - 1) >> PAGE_SHIFT; | |
8339 | start = ubuf >> PAGE_SHIFT; | |
8340 | nr_pages = end - start; | |
8341 | ||
edafccee JA |
8342 | ret = 0; |
8343 | if (!pages || nr_pages > got_pages) { | |
a8c73c1a DE |
8344 | kvfree(vmas); |
8345 | kvfree(pages); | |
d4ef6475 | 8346 | pages = kvmalloc_array(nr_pages, sizeof(struct page *), |
edafccee | 8347 | GFP_KERNEL); |
d4ef6475 | 8348 | vmas = kvmalloc_array(nr_pages, |
edafccee JA |
8349 | sizeof(struct vm_area_struct *), |
8350 | GFP_KERNEL); | |
8351 | if (!pages || !vmas) { | |
8352 | ret = -ENOMEM; | |
edafccee JA |
8353 | goto err; |
8354 | } | |
8355 | got_pages = nr_pages; | |
8356 | } | |
8357 | ||
d4ef6475 | 8358 | imu->bvec = kvmalloc_array(nr_pages, sizeof(struct bio_vec), |
edafccee JA |
8359 | GFP_KERNEL); |
8360 | ret = -ENOMEM; | |
de293938 | 8361 | if (!imu->bvec) |
edafccee | 8362 | goto err; |
edafccee JA |
8363 | |
8364 | ret = 0; | |
d8ed45c5 | 8365 | mmap_read_lock(current->mm); |
2113b05d | 8366 | pret = pin_user_pages(ubuf, nr_pages, |
932f4a63 IW |
8367 | FOLL_WRITE | FOLL_LONGTERM, |
8368 | pages, vmas); | |
edafccee JA |
8369 | if (pret == nr_pages) { |
8370 | /* don't support file backed memory */ | |
8371 | for (j = 0; j < nr_pages; j++) { | |
8372 | struct vm_area_struct *vma = vmas[j]; | |
8373 | ||
8374 | if (vma->vm_file && | |
8375 | !is_file_hugepages(vma->vm_file)) { | |
8376 | ret = -EOPNOTSUPP; | |
8377 | break; | |
8378 | } | |
8379 | } | |
8380 | } else { | |
8381 | ret = pret < 0 ? pret : -EFAULT; | |
8382 | } | |
d8ed45c5 | 8383 | mmap_read_unlock(current->mm); |
edafccee JA |
8384 | if (ret) { |
8385 | /* | |
8386 | * if we did partial map, or found file backed vmas, | |
8387 | * release any pages we did get | |
8388 | */ | |
27c4d3a3 | 8389 | if (pret > 0) |
f1f6a7dd | 8390 | unpin_user_pages(pages, pret); |
de293938 JA |
8391 | kvfree(imu->bvec); |
8392 | goto err; | |
8393 | } | |
8394 | ||
8395 | ret = io_buffer_account_pin(ctx, pages, pret, imu, &last_hpage); | |
8396 | if (ret) { | |
8397 | unpin_user_pages(pages, pret); | |
d4ef6475 | 8398 | kvfree(imu->bvec); |
edafccee JA |
8399 | goto err; |
8400 | } | |
8401 | ||
8402 | off = ubuf & ~PAGE_MASK; | |
8403 | size = iov.iov_len; | |
8404 | for (j = 0; j < nr_pages; j++) { | |
8405 | size_t vec_len; | |
8406 | ||
8407 | vec_len = min_t(size_t, size, PAGE_SIZE - off); | |
8408 | imu->bvec[j].bv_page = pages[j]; | |
8409 | imu->bvec[j].bv_len = vec_len; | |
8410 | imu->bvec[j].bv_offset = off; | |
8411 | off = 0; | |
8412 | size -= vec_len; | |
8413 | } | |
8414 | /* store original address for later verification */ | |
8415 | imu->ubuf = ubuf; | |
8416 | imu->len = iov.iov_len; | |
8417 | imu->nr_bvecs = nr_pages; | |
8418 | ||
8419 | ctx->nr_user_bufs++; | |
8420 | } | |
d4ef6475 MR |
8421 | kvfree(pages); |
8422 | kvfree(vmas); | |
edafccee JA |
8423 | return 0; |
8424 | err: | |
d4ef6475 MR |
8425 | kvfree(pages); |
8426 | kvfree(vmas); | |
edafccee JA |
8427 | io_sqe_buffer_unregister(ctx); |
8428 | return ret; | |
8429 | } | |
8430 | ||
9b402849 JA |
8431 | static int io_eventfd_register(struct io_ring_ctx *ctx, void __user *arg) |
8432 | { | |
8433 | __s32 __user *fds = arg; | |
8434 | int fd; | |
8435 | ||
8436 | if (ctx->cq_ev_fd) | |
8437 | return -EBUSY; | |
8438 | ||
8439 | if (copy_from_user(&fd, fds, sizeof(*fds))) | |
8440 | return -EFAULT; | |
8441 | ||
8442 | ctx->cq_ev_fd = eventfd_ctx_fdget(fd); | |
8443 | if (IS_ERR(ctx->cq_ev_fd)) { | |
8444 | int ret = PTR_ERR(ctx->cq_ev_fd); | |
8445 | ctx->cq_ev_fd = NULL; | |
8446 | return ret; | |
8447 | } | |
8448 | ||
8449 | return 0; | |
8450 | } | |
8451 | ||
8452 | static int io_eventfd_unregister(struct io_ring_ctx *ctx) | |
8453 | { | |
8454 | if (ctx->cq_ev_fd) { | |
8455 | eventfd_ctx_put(ctx->cq_ev_fd); | |
8456 | ctx->cq_ev_fd = NULL; | |
8457 | return 0; | |
8458 | } | |
8459 | ||
8460 | return -ENXIO; | |
8461 | } | |
8462 | ||
5a2e745d JA |
8463 | static int __io_destroy_buffers(int id, void *p, void *data) |
8464 | { | |
8465 | struct io_ring_ctx *ctx = data; | |
8466 | struct io_buffer *buf = p; | |
8467 | ||
067524e9 | 8468 | __io_remove_buffers(ctx, buf, id, -1U); |
5a2e745d JA |
8469 | return 0; |
8470 | } | |
8471 | ||
8472 | static void io_destroy_buffers(struct io_ring_ctx *ctx) | |
8473 | { | |
8474 | idr_for_each(&ctx->io_buffer_idr, __io_destroy_buffers, ctx); | |
8475 | idr_destroy(&ctx->io_buffer_idr); | |
8476 | } | |
8477 | ||
2b188cc1 JA |
8478 | static void io_ring_ctx_free(struct io_ring_ctx *ctx) |
8479 | { | |
6b06314c | 8480 | io_finish_async(ctx); |
5dbcad51 | 8481 | io_sqe_buffer_unregister(ctx); |
2aede0e4 JA |
8482 | |
8483 | if (ctx->sqo_task) { | |
8484 | put_task_struct(ctx->sqo_task); | |
8485 | ctx->sqo_task = NULL; | |
8486 | mmdrop(ctx->mm_account); | |
8487 | ctx->mm_account = NULL; | |
30975825 | 8488 | } |
def596e9 | 8489 | |
91d8f519 DZ |
8490 | #ifdef CONFIG_BLK_CGROUP |
8491 | if (ctx->sqo_blkcg_css) | |
8492 | css_put(ctx->sqo_blkcg_css); | |
8493 | #endif | |
8494 | ||
6b06314c | 8495 | io_sqe_files_unregister(ctx); |
9b402849 | 8496 | io_eventfd_unregister(ctx); |
5a2e745d | 8497 | io_destroy_buffers(ctx); |
41726c9a | 8498 | idr_destroy(&ctx->personality_idr); |
def596e9 | 8499 | |
2b188cc1 | 8500 | #if defined(CONFIG_UNIX) |
355e8d26 EB |
8501 | if (ctx->ring_sock) { |
8502 | ctx->ring_sock->file = NULL; /* so that iput() is called */ | |
2b188cc1 | 8503 | sock_release(ctx->ring_sock); |
355e8d26 | 8504 | } |
2b188cc1 JA |
8505 | #endif |
8506 | ||
75b28aff | 8507 | io_mem_free(ctx->rings); |
2b188cc1 | 8508 | io_mem_free(ctx->sq_sqes); |
2b188cc1 JA |
8509 | |
8510 | percpu_ref_exit(&ctx->refs); | |
2b188cc1 | 8511 | free_uid(ctx->user); |
181e448d | 8512 | put_cred(ctx->creds); |
78076bb6 | 8513 | kfree(ctx->cancel_hash); |
0ddf92e8 | 8514 | kmem_cache_free(req_cachep, ctx->fallback_req); |
2b188cc1 JA |
8515 | kfree(ctx); |
8516 | } | |
8517 | ||
8518 | static __poll_t io_uring_poll(struct file *file, poll_table *wait) | |
8519 | { | |
8520 | struct io_ring_ctx *ctx = file->private_data; | |
8521 | __poll_t mask = 0; | |
8522 | ||
8523 | poll_wait(file, &ctx->cq_wait, wait); | |
4f7067c3 SB |
8524 | /* |
8525 | * synchronizes with barrier from wq_has_sleeper call in | |
8526 | * io_commit_cqring | |
8527 | */ | |
2b188cc1 | 8528 | smp_rmb(); |
90554200 | 8529 | if (!io_sqring_full(ctx)) |
2b188cc1 | 8530 | mask |= EPOLLOUT | EPOLLWRNORM; |
63e5d81f | 8531 | if (io_cqring_events(ctx, false)) |
2b188cc1 JA |
8532 | mask |= EPOLLIN | EPOLLRDNORM; |
8533 | ||
8534 | return mask; | |
8535 | } | |
8536 | ||
8537 | static int io_uring_fasync(int fd, struct file *file, int on) | |
8538 | { | |
8539 | struct io_ring_ctx *ctx = file->private_data; | |
8540 | ||
8541 | return fasync_helper(fd, file, on, &ctx->cq_fasync); | |
8542 | } | |
8543 | ||
071698e1 JA |
8544 | static int io_remove_personalities(int id, void *p, void *data) |
8545 | { | |
8546 | struct io_ring_ctx *ctx = data; | |
1e6fa521 | 8547 | struct io_identity *iod; |
071698e1 | 8548 | |
1e6fa521 JA |
8549 | iod = idr_remove(&ctx->personality_idr, id); |
8550 | if (iod) { | |
8551 | put_cred(iod->creds); | |
8552 | if (refcount_dec_and_test(&iod->count)) | |
8553 | kfree(iod); | |
8554 | } | |
071698e1 JA |
8555 | return 0; |
8556 | } | |
8557 | ||
85faa7b8 JA |
8558 | static void io_ring_exit_work(struct work_struct *work) |
8559 | { | |
b2edc0a7 PB |
8560 | struct io_ring_ctx *ctx = container_of(work, struct io_ring_ctx, |
8561 | exit_work); | |
85faa7b8 | 8562 | |
56952e91 JA |
8563 | /* |
8564 | * If we're doing polled IO and end up having requests being | |
8565 | * submitted async (out-of-line), then completions can come in while | |
8566 | * we're waiting for refs to drop. We need to reap these manually, | |
8567 | * as nobody else will be looking for them. | |
8568 | */ | |
b2edc0a7 | 8569 | do { |
56952e91 | 8570 | if (ctx->rings) |
e6c8aa9a | 8571 | io_cqring_overflow_flush(ctx, true, NULL, NULL); |
b2edc0a7 PB |
8572 | io_iopoll_try_reap_events(ctx); |
8573 | } while (!wait_for_completion_timeout(&ctx->ref_comp, HZ/20)); | |
85faa7b8 JA |
8574 | io_ring_ctx_free(ctx); |
8575 | } | |
8576 | ||
2b188cc1 JA |
8577 | static void io_ring_ctx_wait_and_kill(struct io_ring_ctx *ctx) |
8578 | { | |
8579 | mutex_lock(&ctx->uring_lock); | |
8580 | percpu_ref_kill(&ctx->refs); | |
8581 | mutex_unlock(&ctx->uring_lock); | |
8582 | ||
6b81928d PB |
8583 | io_kill_timeouts(ctx, NULL, NULL); |
8584 | io_poll_remove_all(ctx, NULL, NULL); | |
561fb04a JA |
8585 | |
8586 | if (ctx->io_wq) | |
8587 | io_wq_cancel_all(ctx->io_wq); | |
8588 | ||
15dff286 JA |
8589 | /* if we failed setting up the ctx, we might not have any rings */ |
8590 | if (ctx->rings) | |
e6c8aa9a | 8591 | io_cqring_overflow_flush(ctx, true, NULL, NULL); |
b2edc0a7 | 8592 | io_iopoll_try_reap_events(ctx); |
071698e1 | 8593 | idr_for_each(&ctx->personality_idr, io_remove_personalities, ctx); |
309fc03a JA |
8594 | |
8595 | /* | |
8596 | * Do this upfront, so we won't have a grace period where the ring | |
8597 | * is closed but resources aren't reaped yet. This can cause | |
8598 | * spurious failure in setting up a new ring. | |
8599 | */ | |
760618f7 JA |
8600 | io_unaccount_mem(ctx, ring_pages(ctx->sq_entries, ctx->cq_entries), |
8601 | ACCT_LOCKED); | |
309fc03a | 8602 | |
85faa7b8 | 8603 | INIT_WORK(&ctx->exit_work, io_ring_exit_work); |
fc666777 JA |
8604 | /* |
8605 | * Use system_unbound_wq to avoid spawning tons of event kworkers | |
8606 | * if we're exiting a ton of rings at the same time. It just adds | |
8607 | * noise and overhead, there's no discernable change in runtime | |
8608 | * over using system_wq. | |
8609 | */ | |
8610 | queue_work(system_unbound_wq, &ctx->exit_work); | |
2b188cc1 JA |
8611 | } |
8612 | ||
8613 | static int io_uring_release(struct inode *inode, struct file *file) | |
8614 | { | |
8615 | struct io_ring_ctx *ctx = file->private_data; | |
8616 | ||
8617 | file->private_data = NULL; | |
8618 | io_ring_ctx_wait_and_kill(ctx); | |
8619 | return 0; | |
8620 | } | |
8621 | ||
f6edbabb PB |
8622 | struct io_task_cancel { |
8623 | struct task_struct *task; | |
8624 | struct files_struct *files; | |
8625 | }; | |
f254ac04 | 8626 | |
f6edbabb | 8627 | static bool io_cancel_task_cb(struct io_wq_work *work, void *data) |
b711d4ea | 8628 | { |
9a472ef7 | 8629 | struct io_kiocb *req = container_of(work, struct io_kiocb, work); |
f6edbabb | 8630 | struct io_task_cancel *cancel = data; |
9a472ef7 PB |
8631 | bool ret; |
8632 | ||
f6edbabb | 8633 | if (cancel->files && (req->flags & REQ_F_LINK_TIMEOUT)) { |
9a472ef7 PB |
8634 | unsigned long flags; |
8635 | struct io_ring_ctx *ctx = req->ctx; | |
8636 | ||
8637 | /* protect against races with linked timeouts */ | |
8638 | spin_lock_irqsave(&ctx->completion_lock, flags); | |
f6edbabb | 8639 | ret = io_match_task(req, cancel->task, cancel->files); |
9a472ef7 PB |
8640 | spin_unlock_irqrestore(&ctx->completion_lock, flags); |
8641 | } else { | |
f6edbabb | 8642 | ret = io_match_task(req, cancel->task, cancel->files); |
9a472ef7 PB |
8643 | } |
8644 | return ret; | |
b711d4ea JA |
8645 | } |
8646 | ||
b7ddce3c | 8647 | static void io_cancel_defer_files(struct io_ring_ctx *ctx, |
ef9865a4 | 8648 | struct task_struct *task, |
b7ddce3c PB |
8649 | struct files_struct *files) |
8650 | { | |
8651 | struct io_defer_entry *de = NULL; | |
8652 | LIST_HEAD(list); | |
8653 | ||
8654 | spin_lock_irq(&ctx->completion_lock); | |
8655 | list_for_each_entry_reverse(de, &ctx->defer_list, list) { | |
08d23634 | 8656 | if (io_match_task(de->req, task, files)) { |
b7ddce3c PB |
8657 | list_cut_position(&list, &ctx->defer_list, &de->list); |
8658 | break; | |
8659 | } | |
8660 | } | |
8661 | spin_unlock_irq(&ctx->completion_lock); | |
8662 | ||
8663 | while (!list_empty(&list)) { | |
8664 | de = list_first_entry(&list, struct io_defer_entry, list); | |
8665 | list_del_init(&de->list); | |
8666 | req_set_fail_links(de->req); | |
8667 | io_put_req(de->req); | |
8668 | io_req_complete(de->req, -ECANCELED); | |
8669 | kfree(de); | |
8670 | } | |
8671 | } | |
8672 | ||
b52fda00 | 8673 | static void io_uring_cancel_files(struct io_ring_ctx *ctx, |
df9923f9 | 8674 | struct task_struct *task, |
fcb323cc JA |
8675 | struct files_struct *files) |
8676 | { | |
fcb323cc | 8677 | while (!list_empty_careful(&ctx->inflight_list)) { |
f6edbabb PB |
8678 | struct io_task_cancel cancel = { .task = task, .files = NULL, }; |
8679 | struct io_kiocb *req; | |
d8f1b971 | 8680 | DEFINE_WAIT(wait); |
f6edbabb | 8681 | bool found = false; |
fcb323cc JA |
8682 | |
8683 | spin_lock_irq(&ctx->inflight_lock); | |
8684 | list_for_each_entry(req, &ctx->inflight_list, inflight_entry) { | |
df9923f9 PB |
8685 | if (req->task == task && |
8686 | (req->work.flags & IO_WQ_WORK_FILES) && | |
98447d65 | 8687 | req->work.identity->files != files) |
768134d4 | 8688 | continue; |
f6edbabb | 8689 | found = true; |
768134d4 | 8690 | break; |
fcb323cc | 8691 | } |
f6edbabb | 8692 | if (found) |
fcb323cc | 8693 | prepare_to_wait(&ctx->inflight_wait, &wait, |
768134d4 | 8694 | TASK_UNINTERRUPTIBLE); |
fcb323cc JA |
8695 | spin_unlock_irq(&ctx->inflight_lock); |
8696 | ||
768134d4 | 8697 | /* We need to keep going until we don't find a matching req */ |
f6edbabb | 8698 | if (!found) |
fcb323cc | 8699 | break; |
f6edbabb PB |
8700 | |
8701 | io_wq_cancel_cb(ctx->io_wq, io_cancel_task_cb, &cancel, true); | |
8702 | io_poll_remove_all(ctx, task, files); | |
8703 | io_kill_timeouts(ctx, task, files); | |
6200b0ae JA |
8704 | /* cancellations _may_ trigger task work */ |
8705 | io_run_task_work(); | |
fcb323cc | 8706 | schedule(); |
d8f1b971 | 8707 | finish_wait(&ctx->inflight_wait, &wait); |
fcb323cc JA |
8708 | } |
8709 | } | |
8710 | ||
b52fda00 PB |
8711 | static void __io_uring_cancel_task_requests(struct io_ring_ctx *ctx, |
8712 | struct task_struct *task) | |
0f212204 | 8713 | { |
b52fda00 | 8714 | while (1) { |
f6edbabb | 8715 | struct io_task_cancel cancel = { .task = task, .files = NULL, }; |
0f212204 | 8716 | enum io_wq_cancel cret; |
b52fda00 | 8717 | bool ret = false; |
0f212204 | 8718 | |
f6edbabb | 8719 | cret = io_wq_cancel_cb(ctx->io_wq, io_cancel_task_cb, &cancel, true); |
0f212204 JA |
8720 | if (cret != IO_WQ_CANCEL_NOTFOUND) |
8721 | ret = true; | |
8722 | ||
8723 | /* SQPOLL thread does its own polling */ | |
8724 | if (!(ctx->flags & IORING_SETUP_SQPOLL)) { | |
8725 | while (!list_empty_careful(&ctx->iopoll_list)) { | |
8726 | io_iopoll_try_reap_events(ctx); | |
8727 | ret = true; | |
8728 | } | |
8729 | } | |
8730 | ||
6b81928d PB |
8731 | ret |= io_poll_remove_all(ctx, task, NULL); |
8732 | ret |= io_kill_timeouts(ctx, task, NULL); | |
b52fda00 PB |
8733 | if (!ret) |
8734 | break; | |
8735 | io_run_task_work(); | |
8736 | cond_resched(); | |
0f212204 | 8737 | } |
0f212204 JA |
8738 | } |
8739 | ||
8740 | /* | |
8741 | * We need to iteratively cancel requests, in case a request has dependent | |
8742 | * hard links. These persist even for failure of cancelations, hence keep | |
8743 | * looping until none are found. | |
8744 | */ | |
8745 | static void io_uring_cancel_task_requests(struct io_ring_ctx *ctx, | |
8746 | struct files_struct *files) | |
8747 | { | |
8748 | struct task_struct *task = current; | |
8749 | ||
fdaf083c | 8750 | if ((ctx->flags & IORING_SETUP_SQPOLL) && ctx->sq_data) { |
534ca6d6 | 8751 | task = ctx->sq_data->thread; |
fdaf083c JA |
8752 | atomic_inc(&task->io_uring->in_idle); |
8753 | io_sq_thread_park(ctx->sq_data); | |
8754 | } | |
0f212204 | 8755 | |
df9923f9 | 8756 | io_cancel_defer_files(ctx, task, files); |
0f212204 | 8757 | io_cqring_overflow_flush(ctx, true, task, files); |
b52fda00 | 8758 | io_uring_cancel_files(ctx, task, files); |
0f212204 | 8759 | |
b52fda00 PB |
8760 | if (!files) |
8761 | __io_uring_cancel_task_requests(ctx, task); | |
fdaf083c JA |
8762 | |
8763 | if ((ctx->flags & IORING_SETUP_SQPOLL) && ctx->sq_data) { | |
8764 | atomic_dec(&task->io_uring->in_idle); | |
8765 | /* | |
8766 | * If the files that are going away are the ones in the thread | |
8767 | * identity, clear them out. | |
8768 | */ | |
8769 | if (task->io_uring->identity->files == files) | |
8770 | task->io_uring->identity->files = NULL; | |
8771 | io_sq_thread_unpark(ctx->sq_data); | |
8772 | } | |
0f212204 JA |
8773 | } |
8774 | ||
8775 | /* | |
8776 | * Note that this task has used io_uring. We use it for cancelation purposes. | |
8777 | */ | |
fdaf083c | 8778 | static int io_uring_add_task_file(struct io_ring_ctx *ctx, struct file *file) |
0f212204 | 8779 | { |
236434c3 MWO |
8780 | struct io_uring_task *tctx = current->io_uring; |
8781 | ||
8782 | if (unlikely(!tctx)) { | |
0f212204 JA |
8783 | int ret; |
8784 | ||
8785 | ret = io_uring_alloc_task_context(current); | |
8786 | if (unlikely(ret)) | |
8787 | return ret; | |
236434c3 | 8788 | tctx = current->io_uring; |
0f212204 | 8789 | } |
236434c3 MWO |
8790 | if (tctx->last != file) { |
8791 | void *old = xa_load(&tctx->xa, (unsigned long)file); | |
0f212204 | 8792 | |
236434c3 | 8793 | if (!old) { |
0f212204 | 8794 | get_file(file); |
236434c3 | 8795 | xa_store(&tctx->xa, (unsigned long)file, file, GFP_KERNEL); |
0f212204 | 8796 | } |
236434c3 | 8797 | tctx->last = file; |
0f212204 JA |
8798 | } |
8799 | ||
fdaf083c JA |
8800 | /* |
8801 | * This is race safe in that the task itself is doing this, hence it | |
8802 | * cannot be going through the exit/cancel paths at the same time. | |
8803 | * This cannot be modified while exit/cancel is running. | |
8804 | */ | |
8805 | if (!tctx->sqpoll && (ctx->flags & IORING_SETUP_SQPOLL)) | |
8806 | tctx->sqpoll = true; | |
8807 | ||
0f212204 JA |
8808 | return 0; |
8809 | } | |
8810 | ||
8811 | /* | |
8812 | * Remove this io_uring_file -> task mapping. | |
8813 | */ | |
8814 | static void io_uring_del_task_file(struct file *file) | |
8815 | { | |
8816 | struct io_uring_task *tctx = current->io_uring; | |
0f212204 JA |
8817 | |
8818 | if (tctx->last == file) | |
8819 | tctx->last = NULL; | |
5e2ed8c4 | 8820 | file = xa_erase(&tctx->xa, (unsigned long)file); |
0f212204 JA |
8821 | if (file) |
8822 | fput(file); | |
8823 | } | |
8824 | ||
0f212204 JA |
8825 | /* |
8826 | * Drop task note for this file if we're the only ones that hold it after | |
8827 | * pending fput() | |
8828 | */ | |
c8fb20b5 | 8829 | static void io_uring_attempt_task_drop(struct file *file) |
0f212204 JA |
8830 | { |
8831 | if (!current->io_uring) | |
8832 | return; | |
8833 | /* | |
8834 | * fput() is pending, will be 2 if the only other ref is our potential | |
8835 | * task file note. If the task is exiting, drop regardless of count. | |
8836 | */ | |
c8fb20b5 PB |
8837 | if (fatal_signal_pending(current) || (current->flags & PF_EXITING) || |
8838 | atomic_long_read(&file->f_count) == 2) | |
8839 | io_uring_del_task_file(file); | |
0f212204 JA |
8840 | } |
8841 | ||
8842 | void __io_uring_files_cancel(struct files_struct *files) | |
8843 | { | |
8844 | struct io_uring_task *tctx = current->io_uring; | |
ce765372 MWO |
8845 | struct file *file; |
8846 | unsigned long index; | |
0f212204 JA |
8847 | |
8848 | /* make sure overflow events are dropped */ | |
fdaf083c | 8849 | atomic_inc(&tctx->in_idle); |
0f212204 | 8850 | |
ce765372 MWO |
8851 | xa_for_each(&tctx->xa, index, file) { |
8852 | struct io_ring_ctx *ctx = file->private_data; | |
0f212204 JA |
8853 | |
8854 | io_uring_cancel_task_requests(ctx, files); | |
8855 | if (files) | |
8856 | io_uring_del_task_file(file); | |
ce765372 | 8857 | } |
fdaf083c JA |
8858 | |
8859 | atomic_dec(&tctx->in_idle); | |
8860 | } | |
8861 | ||
8862 | static s64 tctx_inflight(struct io_uring_task *tctx) | |
8863 | { | |
8864 | unsigned long index; | |
8865 | struct file *file; | |
8866 | s64 inflight; | |
8867 | ||
8868 | inflight = percpu_counter_sum(&tctx->inflight); | |
8869 | if (!tctx->sqpoll) | |
8870 | return inflight; | |
8871 | ||
8872 | /* | |
8873 | * If we have SQPOLL rings, then we need to iterate and find them, and | |
8874 | * add the pending count for those. | |
8875 | */ | |
8876 | xa_for_each(&tctx->xa, index, file) { | |
8877 | struct io_ring_ctx *ctx = file->private_data; | |
8878 | ||
8879 | if (ctx->flags & IORING_SETUP_SQPOLL) { | |
8880 | struct io_uring_task *__tctx = ctx->sqo_task->io_uring; | |
8881 | ||
8882 | inflight += percpu_counter_sum(&__tctx->inflight); | |
8883 | } | |
8884 | } | |
8885 | ||
8886 | return inflight; | |
0f212204 JA |
8887 | } |
8888 | ||
0f212204 JA |
8889 | /* |
8890 | * Find any io_uring fd that this task has registered or done IO on, and cancel | |
8891 | * requests. | |
8892 | */ | |
8893 | void __io_uring_task_cancel(void) | |
8894 | { | |
8895 | struct io_uring_task *tctx = current->io_uring; | |
8896 | DEFINE_WAIT(wait); | |
d8a6df10 | 8897 | s64 inflight; |
0f212204 JA |
8898 | |
8899 | /* make sure overflow events are dropped */ | |
fdaf083c | 8900 | atomic_inc(&tctx->in_idle); |
0f212204 | 8901 | |
d8a6df10 | 8902 | do { |
0f212204 | 8903 | /* read completions before cancelations */ |
fdaf083c | 8904 | inflight = tctx_inflight(tctx); |
d8a6df10 JA |
8905 | if (!inflight) |
8906 | break; | |
0f212204 JA |
8907 | __io_uring_files_cancel(NULL); |
8908 | ||
8909 | prepare_to_wait(&tctx->wait, &wait, TASK_UNINTERRUPTIBLE); | |
8910 | ||
8911 | /* | |
8912 | * If we've seen completions, retry. This avoids a race where | |
8913 | * a completion comes in before we did prepare_to_wait(). | |
8914 | */ | |
fdaf083c | 8915 | if (inflight != tctx_inflight(tctx)) |
0f212204 | 8916 | continue; |
0f212204 | 8917 | schedule(); |
d8a6df10 | 8918 | } while (1); |
0f212204 JA |
8919 | |
8920 | finish_wait(&tctx->wait, &wait); | |
fdaf083c | 8921 | atomic_dec(&tctx->in_idle); |
44e728b8 PB |
8922 | } |
8923 | ||
fcb323cc JA |
8924 | static int io_uring_flush(struct file *file, void *data) |
8925 | { | |
c8fb20b5 | 8926 | io_uring_attempt_task_drop(file); |
fcb323cc JA |
8927 | return 0; |
8928 | } | |
8929 | ||
6c5c240e RP |
8930 | static void *io_uring_validate_mmap_request(struct file *file, |
8931 | loff_t pgoff, size_t sz) | |
2b188cc1 | 8932 | { |
2b188cc1 | 8933 | struct io_ring_ctx *ctx = file->private_data; |
6c5c240e | 8934 | loff_t offset = pgoff << PAGE_SHIFT; |
2b188cc1 JA |
8935 | struct page *page; |
8936 | void *ptr; | |
8937 | ||
8938 | switch (offset) { | |
8939 | case IORING_OFF_SQ_RING: | |
75b28aff HV |
8940 | case IORING_OFF_CQ_RING: |
8941 | ptr = ctx->rings; | |
2b188cc1 JA |
8942 | break; |
8943 | case IORING_OFF_SQES: | |
8944 | ptr = ctx->sq_sqes; | |
8945 | break; | |
2b188cc1 | 8946 | default: |
6c5c240e | 8947 | return ERR_PTR(-EINVAL); |
2b188cc1 JA |
8948 | } |
8949 | ||
8950 | page = virt_to_head_page(ptr); | |
a50b854e | 8951 | if (sz > page_size(page)) |
6c5c240e RP |
8952 | return ERR_PTR(-EINVAL); |
8953 | ||
8954 | return ptr; | |
8955 | } | |
8956 | ||
8957 | #ifdef CONFIG_MMU | |
8958 | ||
8959 | static int io_uring_mmap(struct file *file, struct vm_area_struct *vma) | |
8960 | { | |
8961 | size_t sz = vma->vm_end - vma->vm_start; | |
8962 | unsigned long pfn; | |
8963 | void *ptr; | |
8964 | ||
8965 | ptr = io_uring_validate_mmap_request(file, vma->vm_pgoff, sz); | |
8966 | if (IS_ERR(ptr)) | |
8967 | return PTR_ERR(ptr); | |
2b188cc1 JA |
8968 | |
8969 | pfn = virt_to_phys(ptr) >> PAGE_SHIFT; | |
8970 | return remap_pfn_range(vma, vma->vm_start, pfn, sz, vma->vm_page_prot); | |
8971 | } | |
8972 | ||
6c5c240e RP |
8973 | #else /* !CONFIG_MMU */ |
8974 | ||
8975 | static int io_uring_mmap(struct file *file, struct vm_area_struct *vma) | |
8976 | { | |
8977 | return vma->vm_flags & (VM_SHARED | VM_MAYSHARE) ? 0 : -EINVAL; | |
8978 | } | |
8979 | ||
8980 | static unsigned int io_uring_nommu_mmap_capabilities(struct file *file) | |
8981 | { | |
8982 | return NOMMU_MAP_DIRECT | NOMMU_MAP_READ | NOMMU_MAP_WRITE; | |
8983 | } | |
8984 | ||
8985 | static unsigned long io_uring_nommu_get_unmapped_area(struct file *file, | |
8986 | unsigned long addr, unsigned long len, | |
8987 | unsigned long pgoff, unsigned long flags) | |
8988 | { | |
8989 | void *ptr; | |
8990 | ||
8991 | ptr = io_uring_validate_mmap_request(file, pgoff, len); | |
8992 | if (IS_ERR(ptr)) | |
8993 | return PTR_ERR(ptr); | |
8994 | ||
8995 | return (unsigned long) ptr; | |
8996 | } | |
8997 | ||
8998 | #endif /* !CONFIG_MMU */ | |
8999 | ||
90554200 JA |
9000 | static void io_sqpoll_wait_sq(struct io_ring_ctx *ctx) |
9001 | { | |
9002 | DEFINE_WAIT(wait); | |
9003 | ||
9004 | do { | |
9005 | if (!io_sqring_full(ctx)) | |
9006 | break; | |
9007 | ||
9008 | prepare_to_wait(&ctx->sqo_sq_wait, &wait, TASK_INTERRUPTIBLE); | |
9009 | ||
9010 | if (!io_sqring_full(ctx)) | |
9011 | break; | |
9012 | ||
9013 | schedule(); | |
9014 | } while (!signal_pending(current)); | |
9015 | ||
9016 | finish_wait(&ctx->sqo_sq_wait, &wait); | |
9017 | } | |
9018 | ||
c73ebb68 HX |
9019 | static int io_get_ext_arg(unsigned flags, const void __user *argp, size_t *argsz, |
9020 | struct __kernel_timespec __user **ts, | |
9021 | const sigset_t __user **sig) | |
9022 | { | |
9023 | struct io_uring_getevents_arg arg; | |
9024 | ||
9025 | /* | |
9026 | * If EXT_ARG isn't set, then we have no timespec and the argp pointer | |
9027 | * is just a pointer to the sigset_t. | |
9028 | */ | |
9029 | if (!(flags & IORING_ENTER_EXT_ARG)) { | |
9030 | *sig = (const sigset_t __user *) argp; | |
9031 | *ts = NULL; | |
9032 | return 0; | |
9033 | } | |
9034 | ||
9035 | /* | |
9036 | * EXT_ARG is set - ensure we agree on the size of it and copy in our | |
9037 | * timespec and sigset_t pointers if good. | |
9038 | */ | |
9039 | if (*argsz != sizeof(arg)) | |
9040 | return -EINVAL; | |
9041 | if (copy_from_user(&arg, argp, sizeof(arg))) | |
9042 | return -EFAULT; | |
9043 | *sig = u64_to_user_ptr(arg.sigmask); | |
9044 | *argsz = arg.sigmask_sz; | |
9045 | *ts = u64_to_user_ptr(arg.ts); | |
9046 | return 0; | |
9047 | } | |
9048 | ||
2b188cc1 | 9049 | SYSCALL_DEFINE6(io_uring_enter, unsigned int, fd, u32, to_submit, |
c73ebb68 HX |
9050 | u32, min_complete, u32, flags, const void __user *, argp, |
9051 | size_t, argsz) | |
2b188cc1 JA |
9052 | { |
9053 | struct io_ring_ctx *ctx; | |
9054 | long ret = -EBADF; | |
9055 | int submitted = 0; | |
9056 | struct fd f; | |
9057 | ||
4c6e277c | 9058 | io_run_task_work(); |
b41e9852 | 9059 | |
90554200 | 9060 | if (flags & ~(IORING_ENTER_GETEVENTS | IORING_ENTER_SQ_WAKEUP | |
c73ebb68 | 9061 | IORING_ENTER_SQ_WAIT | IORING_ENTER_EXT_ARG)) |
2b188cc1 JA |
9062 | return -EINVAL; |
9063 | ||
9064 | f = fdget(fd); | |
9065 | if (!f.file) | |
9066 | return -EBADF; | |
9067 | ||
9068 | ret = -EOPNOTSUPP; | |
9069 | if (f.file->f_op != &io_uring_fops) | |
9070 | goto out_fput; | |
9071 | ||
9072 | ret = -ENXIO; | |
9073 | ctx = f.file->private_data; | |
9074 | if (!percpu_ref_tryget(&ctx->refs)) | |
9075 | goto out_fput; | |
9076 | ||
7e84e1c7 SG |
9077 | ret = -EBADFD; |
9078 | if (ctx->flags & IORING_SETUP_R_DISABLED) | |
9079 | goto out; | |
9080 | ||
6c271ce2 JA |
9081 | /* |
9082 | * For SQ polling, the thread will do all submissions and completions. | |
9083 | * Just return the requested submit count, and wake the thread if | |
9084 | * we were asked to. | |
9085 | */ | |
b2a9eada | 9086 | ret = 0; |
6c271ce2 | 9087 | if (ctx->flags & IORING_SETUP_SQPOLL) { |
c1edbf5f | 9088 | if (!list_empty_careful(&ctx->cq_overflow_list)) |
e6c8aa9a | 9089 | io_cqring_overflow_flush(ctx, false, NULL, NULL); |
6c271ce2 | 9090 | if (flags & IORING_ENTER_SQ_WAKEUP) |
534ca6d6 | 9091 | wake_up(&ctx->sq_data->wait); |
90554200 JA |
9092 | if (flags & IORING_ENTER_SQ_WAIT) |
9093 | io_sqpoll_wait_sq(ctx); | |
6c271ce2 | 9094 | submitted = to_submit; |
b2a9eada | 9095 | } else if (to_submit) { |
fdaf083c | 9096 | ret = io_uring_add_task_file(ctx, f.file); |
0f212204 JA |
9097 | if (unlikely(ret)) |
9098 | goto out; | |
2b188cc1 | 9099 | mutex_lock(&ctx->uring_lock); |
0f212204 | 9100 | submitted = io_submit_sqes(ctx, to_submit); |
2b188cc1 | 9101 | mutex_unlock(&ctx->uring_lock); |
7c504e65 PB |
9102 | |
9103 | if (submitted != to_submit) | |
9104 | goto out; | |
2b188cc1 JA |
9105 | } |
9106 | if (flags & IORING_ENTER_GETEVENTS) { | |
c73ebb68 HX |
9107 | const sigset_t __user *sig; |
9108 | struct __kernel_timespec __user *ts; | |
9109 | ||
9110 | ret = io_get_ext_arg(flags, argp, &argsz, &ts, &sig); | |
9111 | if (unlikely(ret)) | |
9112 | goto out; | |
9113 | ||
2b188cc1 JA |
9114 | min_complete = min(min_complete, ctx->cq_entries); |
9115 | ||
32b2244a XW |
9116 | /* |
9117 | * When SETUP_IOPOLL and SETUP_SQPOLL are both enabled, user | |
9118 | * space applications don't need to do io completion events | |
9119 | * polling again, they can rely on io_sq_thread to do polling | |
9120 | * work, which can reduce cpu usage and uring_lock contention. | |
9121 | */ | |
9122 | if (ctx->flags & IORING_SETUP_IOPOLL && | |
9123 | !(ctx->flags & IORING_SETUP_SQPOLL)) { | |
7668b92a | 9124 | ret = io_iopoll_check(ctx, min_complete); |
def596e9 | 9125 | } else { |
c73ebb68 | 9126 | ret = io_cqring_wait(ctx, min_complete, sig, argsz, ts); |
def596e9 | 9127 | } |
2b188cc1 JA |
9128 | } |
9129 | ||
7c504e65 | 9130 | out: |
6805b32e | 9131 | percpu_ref_put(&ctx->refs); |
2b188cc1 JA |
9132 | out_fput: |
9133 | fdput(f); | |
9134 | return submitted ? submitted : ret; | |
9135 | } | |
9136 | ||
bebdb65e | 9137 | #ifdef CONFIG_PROC_FS |
87ce955b JA |
9138 | static int io_uring_show_cred(int id, void *p, void *data) |
9139 | { | |
6b47ab81 JA |
9140 | struct io_identity *iod = p; |
9141 | const struct cred *cred = iod->creds; | |
87ce955b JA |
9142 | struct seq_file *m = data; |
9143 | struct user_namespace *uns = seq_user_ns(m); | |
9144 | struct group_info *gi; | |
9145 | kernel_cap_t cap; | |
9146 | unsigned __capi; | |
9147 | int g; | |
9148 | ||
9149 | seq_printf(m, "%5d\n", id); | |
9150 | seq_put_decimal_ull(m, "\tUid:\t", from_kuid_munged(uns, cred->uid)); | |
9151 | seq_put_decimal_ull(m, "\t\t", from_kuid_munged(uns, cred->euid)); | |
9152 | seq_put_decimal_ull(m, "\t\t", from_kuid_munged(uns, cred->suid)); | |
9153 | seq_put_decimal_ull(m, "\t\t", from_kuid_munged(uns, cred->fsuid)); | |
9154 | seq_put_decimal_ull(m, "\n\tGid:\t", from_kgid_munged(uns, cred->gid)); | |
9155 | seq_put_decimal_ull(m, "\t\t", from_kgid_munged(uns, cred->egid)); | |
9156 | seq_put_decimal_ull(m, "\t\t", from_kgid_munged(uns, cred->sgid)); | |
9157 | seq_put_decimal_ull(m, "\t\t", from_kgid_munged(uns, cred->fsgid)); | |
9158 | seq_puts(m, "\n\tGroups:\t"); | |
9159 | gi = cred->group_info; | |
9160 | for (g = 0; g < gi->ngroups; g++) { | |
9161 | seq_put_decimal_ull(m, g ? " " : "", | |
9162 | from_kgid_munged(uns, gi->gid[g])); | |
9163 | } | |
9164 | seq_puts(m, "\n\tCapEff:\t"); | |
9165 | cap = cred->cap_effective; | |
9166 | CAP_FOR_EACH_U32(__capi) | |
9167 | seq_put_hex_ll(m, NULL, cap.cap[CAP_LAST_U32 - __capi], 8); | |
9168 | seq_putc(m, '\n'); | |
9169 | return 0; | |
9170 | } | |
9171 | ||
9172 | static void __io_uring_show_fdinfo(struct io_ring_ctx *ctx, struct seq_file *m) | |
9173 | { | |
dbbe9c64 | 9174 | struct io_sq_data *sq = NULL; |
fad8e0de | 9175 | bool has_lock; |
87ce955b JA |
9176 | int i; |
9177 | ||
fad8e0de JA |
9178 | /* |
9179 | * Avoid ABBA deadlock between the seq lock and the io_uring mutex, | |
9180 | * since fdinfo case grabs it in the opposite direction of normal use | |
9181 | * cases. If we fail to get the lock, we just don't iterate any | |
9182 | * structures that could be going away outside the io_uring mutex. | |
9183 | */ | |
9184 | has_lock = mutex_trylock(&ctx->uring_lock); | |
9185 | ||
dbbe9c64 JQ |
9186 | if (has_lock && (ctx->flags & IORING_SETUP_SQPOLL)) |
9187 | sq = ctx->sq_data; | |
9188 | ||
9189 | seq_printf(m, "SqThread:\t%d\n", sq ? task_pid_nr(sq->thread) : -1); | |
9190 | seq_printf(m, "SqThreadCpu:\t%d\n", sq ? task_cpu(sq->thread) : -1); | |
87ce955b | 9191 | seq_printf(m, "UserFiles:\t%u\n", ctx->nr_user_files); |
fad8e0de | 9192 | for (i = 0; has_lock && i < ctx->nr_user_files; i++) { |
87ce955b JA |
9193 | struct fixed_file_table *table; |
9194 | struct file *f; | |
9195 | ||
9196 | table = &ctx->file_data->table[i >> IORING_FILE_TABLE_SHIFT]; | |
9197 | f = table->files[i & IORING_FILE_TABLE_MASK]; | |
9198 | if (f) | |
9199 | seq_printf(m, "%5u: %s\n", i, file_dentry(f)->d_iname); | |
9200 | else | |
9201 | seq_printf(m, "%5u: <none>\n", i); | |
9202 | } | |
9203 | seq_printf(m, "UserBufs:\t%u\n", ctx->nr_user_bufs); | |
fad8e0de | 9204 | for (i = 0; has_lock && i < ctx->nr_user_bufs; i++) { |
87ce955b JA |
9205 | struct io_mapped_ubuf *buf = &ctx->user_bufs[i]; |
9206 | ||
9207 | seq_printf(m, "%5u: 0x%llx/%u\n", i, buf->ubuf, | |
9208 | (unsigned int) buf->len); | |
9209 | } | |
fad8e0de | 9210 | if (has_lock && !idr_is_empty(&ctx->personality_idr)) { |
87ce955b JA |
9211 | seq_printf(m, "Personalities:\n"); |
9212 | idr_for_each(&ctx->personality_idr, io_uring_show_cred, m); | |
9213 | } | |
d7718a9d JA |
9214 | seq_printf(m, "PollList:\n"); |
9215 | spin_lock_irq(&ctx->completion_lock); | |
9216 | for (i = 0; i < (1U << ctx->cancel_hash_bits); i++) { | |
9217 | struct hlist_head *list = &ctx->cancel_hash[i]; | |
9218 | struct io_kiocb *req; | |
9219 | ||
9220 | hlist_for_each_entry(req, list, hash_node) | |
9221 | seq_printf(m, " op=%d, task_works=%d\n", req->opcode, | |
9222 | req->task->task_works != NULL); | |
9223 | } | |
9224 | spin_unlock_irq(&ctx->completion_lock); | |
fad8e0de JA |
9225 | if (has_lock) |
9226 | mutex_unlock(&ctx->uring_lock); | |
87ce955b JA |
9227 | } |
9228 | ||
9229 | static void io_uring_show_fdinfo(struct seq_file *m, struct file *f) | |
9230 | { | |
9231 | struct io_ring_ctx *ctx = f->private_data; | |
9232 | ||
9233 | if (percpu_ref_tryget(&ctx->refs)) { | |
9234 | __io_uring_show_fdinfo(ctx, m); | |
9235 | percpu_ref_put(&ctx->refs); | |
9236 | } | |
9237 | } | |
bebdb65e | 9238 | #endif |
87ce955b | 9239 | |
2b188cc1 JA |
9240 | static const struct file_operations io_uring_fops = { |
9241 | .release = io_uring_release, | |
fcb323cc | 9242 | .flush = io_uring_flush, |
2b188cc1 | 9243 | .mmap = io_uring_mmap, |
6c5c240e RP |
9244 | #ifndef CONFIG_MMU |
9245 | .get_unmapped_area = io_uring_nommu_get_unmapped_area, | |
9246 | .mmap_capabilities = io_uring_nommu_mmap_capabilities, | |
9247 | #endif | |
2b188cc1 JA |
9248 | .poll = io_uring_poll, |
9249 | .fasync = io_uring_fasync, | |
bebdb65e | 9250 | #ifdef CONFIG_PROC_FS |
87ce955b | 9251 | .show_fdinfo = io_uring_show_fdinfo, |
bebdb65e | 9252 | #endif |
2b188cc1 JA |
9253 | }; |
9254 | ||
9255 | static int io_allocate_scq_urings(struct io_ring_ctx *ctx, | |
9256 | struct io_uring_params *p) | |
9257 | { | |
75b28aff HV |
9258 | struct io_rings *rings; |
9259 | size_t size, sq_array_offset; | |
2b188cc1 | 9260 | |
bd740481 JA |
9261 | /* make sure these are sane, as we already accounted them */ |
9262 | ctx->sq_entries = p->sq_entries; | |
9263 | ctx->cq_entries = p->cq_entries; | |
9264 | ||
75b28aff HV |
9265 | size = rings_size(p->sq_entries, p->cq_entries, &sq_array_offset); |
9266 | if (size == SIZE_MAX) | |
9267 | return -EOVERFLOW; | |
9268 | ||
9269 | rings = io_mem_alloc(size); | |
9270 | if (!rings) | |
2b188cc1 JA |
9271 | return -ENOMEM; |
9272 | ||
75b28aff HV |
9273 | ctx->rings = rings; |
9274 | ctx->sq_array = (u32 *)((char *)rings + sq_array_offset); | |
9275 | rings->sq_ring_mask = p->sq_entries - 1; | |
9276 | rings->cq_ring_mask = p->cq_entries - 1; | |
9277 | rings->sq_ring_entries = p->sq_entries; | |
9278 | rings->cq_ring_entries = p->cq_entries; | |
9279 | ctx->sq_mask = rings->sq_ring_mask; | |
9280 | ctx->cq_mask = rings->cq_ring_mask; | |
2b188cc1 JA |
9281 | |
9282 | size = array_size(sizeof(struct io_uring_sqe), p->sq_entries); | |
eb065d30 JA |
9283 | if (size == SIZE_MAX) { |
9284 | io_mem_free(ctx->rings); | |
9285 | ctx->rings = NULL; | |
2b188cc1 | 9286 | return -EOVERFLOW; |
eb065d30 | 9287 | } |
2b188cc1 JA |
9288 | |
9289 | ctx->sq_sqes = io_mem_alloc(size); | |
eb065d30 JA |
9290 | if (!ctx->sq_sqes) { |
9291 | io_mem_free(ctx->rings); | |
9292 | ctx->rings = NULL; | |
2b188cc1 | 9293 | return -ENOMEM; |
eb065d30 | 9294 | } |
2b188cc1 | 9295 | |
2b188cc1 JA |
9296 | return 0; |
9297 | } | |
9298 | ||
9299 | /* | |
9300 | * Allocate an anonymous fd, this is what constitutes the application | |
9301 | * visible backing of an io_uring instance. The application mmaps this | |
9302 | * fd to gain access to the SQ/CQ ring details. If UNIX sockets are enabled, | |
9303 | * we have to tie this fd to a socket for file garbage collection purposes. | |
9304 | */ | |
9305 | static int io_uring_get_fd(struct io_ring_ctx *ctx) | |
9306 | { | |
9307 | struct file *file; | |
9308 | int ret; | |
9309 | ||
9310 | #if defined(CONFIG_UNIX) | |
9311 | ret = sock_create_kern(&init_net, PF_UNIX, SOCK_RAW, IPPROTO_IP, | |
9312 | &ctx->ring_sock); | |
9313 | if (ret) | |
9314 | return ret; | |
9315 | #endif | |
9316 | ||
9317 | ret = get_unused_fd_flags(O_RDWR | O_CLOEXEC); | |
9318 | if (ret < 0) | |
9319 | goto err; | |
9320 | ||
9321 | file = anon_inode_getfile("[io_uring]", &io_uring_fops, ctx, | |
9322 | O_RDWR | O_CLOEXEC); | |
9323 | if (IS_ERR(file)) { | |
0f212204 | 9324 | err_fd: |
2b188cc1 JA |
9325 | put_unused_fd(ret); |
9326 | ret = PTR_ERR(file); | |
9327 | goto err; | |
9328 | } | |
9329 | ||
9330 | #if defined(CONFIG_UNIX) | |
9331 | ctx->ring_sock->file = file; | |
9332 | #endif | |
fdaf083c | 9333 | if (unlikely(io_uring_add_task_file(ctx, file))) { |
0f212204 JA |
9334 | file = ERR_PTR(-ENOMEM); |
9335 | goto err_fd; | |
9336 | } | |
2b188cc1 JA |
9337 | fd_install(ret, file); |
9338 | return ret; | |
9339 | err: | |
9340 | #if defined(CONFIG_UNIX) | |
9341 | sock_release(ctx->ring_sock); | |
9342 | ctx->ring_sock = NULL; | |
9343 | #endif | |
9344 | return ret; | |
9345 | } | |
9346 | ||
7f13657d XW |
9347 | static int io_uring_create(unsigned entries, struct io_uring_params *p, |
9348 | struct io_uring_params __user *params) | |
2b188cc1 JA |
9349 | { |
9350 | struct user_struct *user = NULL; | |
9351 | struct io_ring_ctx *ctx; | |
aad5d8da | 9352 | bool limit_mem; |
2b188cc1 JA |
9353 | int ret; |
9354 | ||
8110c1a6 | 9355 | if (!entries) |
2b188cc1 | 9356 | return -EINVAL; |
8110c1a6 JA |
9357 | if (entries > IORING_MAX_ENTRIES) { |
9358 | if (!(p->flags & IORING_SETUP_CLAMP)) | |
9359 | return -EINVAL; | |
9360 | entries = IORING_MAX_ENTRIES; | |
9361 | } | |
2b188cc1 JA |
9362 | |
9363 | /* | |
9364 | * Use twice as many entries for the CQ ring. It's possible for the | |
9365 | * application to drive a higher depth than the size of the SQ ring, | |
9366 | * since the sqes are only used at submission time. This allows for | |
33a107f0 JA |
9367 | * some flexibility in overcommitting a bit. If the application has |
9368 | * set IORING_SETUP_CQSIZE, it will have passed in the desired number | |
9369 | * of CQ ring entries manually. | |
2b188cc1 JA |
9370 | */ |
9371 | p->sq_entries = roundup_pow_of_two(entries); | |
33a107f0 JA |
9372 | if (p->flags & IORING_SETUP_CQSIZE) { |
9373 | /* | |
9374 | * If IORING_SETUP_CQSIZE is set, we do the same roundup | |
9375 | * to a power-of-two, if it isn't already. We do NOT impose | |
9376 | * any cq vs sq ring sizing. | |
9377 | */ | |
88ec3211 | 9378 | p->cq_entries = roundup_pow_of_two(p->cq_entries); |
8110c1a6 | 9379 | if (p->cq_entries < p->sq_entries) |
33a107f0 | 9380 | return -EINVAL; |
8110c1a6 JA |
9381 | if (p->cq_entries > IORING_MAX_CQ_ENTRIES) { |
9382 | if (!(p->flags & IORING_SETUP_CLAMP)) | |
9383 | return -EINVAL; | |
9384 | p->cq_entries = IORING_MAX_CQ_ENTRIES; | |
9385 | } | |
33a107f0 JA |
9386 | } else { |
9387 | p->cq_entries = 2 * p->sq_entries; | |
9388 | } | |
2b188cc1 JA |
9389 | |
9390 | user = get_uid(current_user()); | |
aad5d8da | 9391 | limit_mem = !capable(CAP_IPC_LOCK); |
2b188cc1 | 9392 | |
aad5d8da | 9393 | if (limit_mem) { |
a087e2b5 | 9394 | ret = __io_account_mem(user, |
2b188cc1 JA |
9395 | ring_pages(p->sq_entries, p->cq_entries)); |
9396 | if (ret) { | |
9397 | free_uid(user); | |
9398 | return ret; | |
9399 | } | |
9400 | } | |
9401 | ||
9402 | ctx = io_ring_ctx_alloc(p); | |
9403 | if (!ctx) { | |
aad5d8da | 9404 | if (limit_mem) |
a087e2b5 | 9405 | __io_unaccount_mem(user, ring_pages(p->sq_entries, |
2b188cc1 JA |
9406 | p->cq_entries)); |
9407 | free_uid(user); | |
9408 | return -ENOMEM; | |
9409 | } | |
9410 | ctx->compat = in_compat_syscall(); | |
2b188cc1 | 9411 | ctx->user = user; |
0b8c0ec7 | 9412 | ctx->creds = get_current_cred(); |
4ea33a97 JA |
9413 | #ifdef CONFIG_AUDIT |
9414 | ctx->loginuid = current->loginuid; | |
9415 | ctx->sessionid = current->sessionid; | |
9416 | #endif | |
2aede0e4 JA |
9417 | ctx->sqo_task = get_task_struct(current); |
9418 | ||
9419 | /* | |
9420 | * This is just grabbed for accounting purposes. When a process exits, | |
9421 | * the mm is exited and dropped before the files, hence we need to hang | |
9422 | * on to this mm purely for the purposes of being able to unaccount | |
9423 | * memory (locked/pinned vm). It's not used for anything else. | |
9424 | */ | |
6b7898eb | 9425 | mmgrab(current->mm); |
2aede0e4 | 9426 | ctx->mm_account = current->mm; |
6b7898eb | 9427 | |
91d8f519 DZ |
9428 | #ifdef CONFIG_BLK_CGROUP |
9429 | /* | |
9430 | * The sq thread will belong to the original cgroup it was inited in. | |
9431 | * If the cgroup goes offline (e.g. disabling the io controller), then | |
9432 | * issued bios will be associated with the closest cgroup later in the | |
9433 | * block layer. | |
9434 | */ | |
9435 | rcu_read_lock(); | |
9436 | ctx->sqo_blkcg_css = blkcg_css(); | |
9437 | ret = css_tryget_online(ctx->sqo_blkcg_css); | |
9438 | rcu_read_unlock(); | |
9439 | if (!ret) { | |
9440 | /* don't init against a dying cgroup, have the user try again */ | |
9441 | ctx->sqo_blkcg_css = NULL; | |
9442 | ret = -ENODEV; | |
9443 | goto err; | |
9444 | } | |
9445 | #endif | |
6b7898eb | 9446 | |
f74441e6 JA |
9447 | /* |
9448 | * Account memory _before_ installing the file descriptor. Once | |
9449 | * the descriptor is installed, it can get closed at any time. Also | |
9450 | * do this before hitting the general error path, as ring freeing | |
9451 | * will un-account as well. | |
9452 | */ | |
9453 | io_account_mem(ctx, ring_pages(p->sq_entries, p->cq_entries), | |
9454 | ACCT_LOCKED); | |
9455 | ctx->limit_mem = limit_mem; | |
9456 | ||
2b188cc1 JA |
9457 | ret = io_allocate_scq_urings(ctx, p); |
9458 | if (ret) | |
9459 | goto err; | |
9460 | ||
7e84e1c7 | 9461 | ret = io_sq_offload_create(ctx, p); |
2b188cc1 JA |
9462 | if (ret) |
9463 | goto err; | |
9464 | ||
7e84e1c7 SG |
9465 | if (!(p->flags & IORING_SETUP_R_DISABLED)) |
9466 | io_sq_offload_start(ctx); | |
9467 | ||
2b188cc1 | 9468 | memset(&p->sq_off, 0, sizeof(p->sq_off)); |
75b28aff HV |
9469 | p->sq_off.head = offsetof(struct io_rings, sq.head); |
9470 | p->sq_off.tail = offsetof(struct io_rings, sq.tail); | |
9471 | p->sq_off.ring_mask = offsetof(struct io_rings, sq_ring_mask); | |
9472 | p->sq_off.ring_entries = offsetof(struct io_rings, sq_ring_entries); | |
9473 | p->sq_off.flags = offsetof(struct io_rings, sq_flags); | |
9474 | p->sq_off.dropped = offsetof(struct io_rings, sq_dropped); | |
9475 | p->sq_off.array = (char *)ctx->sq_array - (char *)ctx->rings; | |
2b188cc1 JA |
9476 | |
9477 | memset(&p->cq_off, 0, sizeof(p->cq_off)); | |
75b28aff HV |
9478 | p->cq_off.head = offsetof(struct io_rings, cq.head); |
9479 | p->cq_off.tail = offsetof(struct io_rings, cq.tail); | |
9480 | p->cq_off.ring_mask = offsetof(struct io_rings, cq_ring_mask); | |
9481 | p->cq_off.ring_entries = offsetof(struct io_rings, cq_ring_entries); | |
9482 | p->cq_off.overflow = offsetof(struct io_rings, cq_overflow); | |
9483 | p->cq_off.cqes = offsetof(struct io_rings, cqes); | |
0d9b5b3a | 9484 | p->cq_off.flags = offsetof(struct io_rings, cq_flags); |
ac90f249 | 9485 | |
7f13657d XW |
9486 | p->features = IORING_FEAT_SINGLE_MMAP | IORING_FEAT_NODROP | |
9487 | IORING_FEAT_SUBMIT_STABLE | IORING_FEAT_RW_CUR_POS | | |
5769a351 | 9488 | IORING_FEAT_CUR_PERSONALITY | IORING_FEAT_FAST_POLL | |
c73ebb68 HX |
9489 | IORING_FEAT_POLL_32BITS | IORING_FEAT_SQPOLL_NONFIXED | |
9490 | IORING_FEAT_EXT_ARG; | |
7f13657d XW |
9491 | |
9492 | if (copy_to_user(params, p, sizeof(*p))) { | |
9493 | ret = -EFAULT; | |
9494 | goto err; | |
9495 | } | |
d1719f70 | 9496 | |
044c1ab3 JA |
9497 | /* |
9498 | * Install ring fd as the very last thing, so we don't risk someone | |
9499 | * having closed it before we finish setup | |
9500 | */ | |
9501 | ret = io_uring_get_fd(ctx); | |
9502 | if (ret < 0) | |
9503 | goto err; | |
9504 | ||
c826bd7a | 9505 | trace_io_uring_create(ret, ctx, p->sq_entries, p->cq_entries, p->flags); |
2b188cc1 JA |
9506 | return ret; |
9507 | err: | |
9508 | io_ring_ctx_wait_and_kill(ctx); | |
9509 | return ret; | |
9510 | } | |
9511 | ||
9512 | /* | |
9513 | * Sets up an aio uring context, and returns the fd. Applications asks for a | |
9514 | * ring size, we return the actual sq/cq ring sizes (among other things) in the | |
9515 | * params structure passed in. | |
9516 | */ | |
9517 | static long io_uring_setup(u32 entries, struct io_uring_params __user *params) | |
9518 | { | |
9519 | struct io_uring_params p; | |
2b188cc1 JA |
9520 | int i; |
9521 | ||
9522 | if (copy_from_user(&p, params, sizeof(p))) | |
9523 | return -EFAULT; | |
9524 | for (i = 0; i < ARRAY_SIZE(p.resv); i++) { | |
9525 | if (p.resv[i]) | |
9526 | return -EINVAL; | |
9527 | } | |
9528 | ||
6c271ce2 | 9529 | if (p.flags & ~(IORING_SETUP_IOPOLL | IORING_SETUP_SQPOLL | |
8110c1a6 | 9530 | IORING_SETUP_SQ_AFF | IORING_SETUP_CQSIZE | |
7e84e1c7 SG |
9531 | IORING_SETUP_CLAMP | IORING_SETUP_ATTACH_WQ | |
9532 | IORING_SETUP_R_DISABLED)) | |
2b188cc1 JA |
9533 | return -EINVAL; |
9534 | ||
7f13657d | 9535 | return io_uring_create(entries, &p, params); |
2b188cc1 JA |
9536 | } |
9537 | ||
9538 | SYSCALL_DEFINE2(io_uring_setup, u32, entries, | |
9539 | struct io_uring_params __user *, params) | |
9540 | { | |
9541 | return io_uring_setup(entries, params); | |
9542 | } | |
9543 | ||
66f4af93 JA |
9544 | static int io_probe(struct io_ring_ctx *ctx, void __user *arg, unsigned nr_args) |
9545 | { | |
9546 | struct io_uring_probe *p; | |
9547 | size_t size; | |
9548 | int i, ret; | |
9549 | ||
9550 | size = struct_size(p, ops, nr_args); | |
9551 | if (size == SIZE_MAX) | |
9552 | return -EOVERFLOW; | |
9553 | p = kzalloc(size, GFP_KERNEL); | |
9554 | if (!p) | |
9555 | return -ENOMEM; | |
9556 | ||
9557 | ret = -EFAULT; | |
9558 | if (copy_from_user(p, arg, size)) | |
9559 | goto out; | |
9560 | ret = -EINVAL; | |
9561 | if (memchr_inv(p, 0, size)) | |
9562 | goto out; | |
9563 | ||
9564 | p->last_op = IORING_OP_LAST - 1; | |
9565 | if (nr_args > IORING_OP_LAST) | |
9566 | nr_args = IORING_OP_LAST; | |
9567 | ||
9568 | for (i = 0; i < nr_args; i++) { | |
9569 | p->ops[i].op = i; | |
9570 | if (!io_op_defs[i].not_supported) | |
9571 | p->ops[i].flags = IO_URING_OP_SUPPORTED; | |
9572 | } | |
9573 | p->ops_len = i; | |
9574 | ||
9575 | ret = 0; | |
9576 | if (copy_to_user(arg, p, size)) | |
9577 | ret = -EFAULT; | |
9578 | out: | |
9579 | kfree(p); | |
9580 | return ret; | |
9581 | } | |
9582 | ||
071698e1 JA |
9583 | static int io_register_personality(struct io_ring_ctx *ctx) |
9584 | { | |
1e6fa521 JA |
9585 | struct io_identity *id; |
9586 | int ret; | |
071698e1 | 9587 | |
1e6fa521 JA |
9588 | id = kmalloc(sizeof(*id), GFP_KERNEL); |
9589 | if (unlikely(!id)) | |
9590 | return -ENOMEM; | |
9591 | ||
9592 | io_init_identity(id); | |
9593 | id->creds = get_current_cred(); | |
9594 | ||
9595 | ret = idr_alloc_cyclic(&ctx->personality_idr, id, 1, USHRT_MAX, GFP_KERNEL); | |
9596 | if (ret < 0) { | |
9597 | put_cred(id->creds); | |
9598 | kfree(id); | |
9599 | } | |
9600 | return ret; | |
071698e1 JA |
9601 | } |
9602 | ||
9603 | static int io_unregister_personality(struct io_ring_ctx *ctx, unsigned id) | |
9604 | { | |
1e6fa521 | 9605 | struct io_identity *iod; |
071698e1 | 9606 | |
1e6fa521 JA |
9607 | iod = idr_remove(&ctx->personality_idr, id); |
9608 | if (iod) { | |
9609 | put_cred(iod->creds); | |
9610 | if (refcount_dec_and_test(&iod->count)) | |
9611 | kfree(iod); | |
071698e1 JA |
9612 | return 0; |
9613 | } | |
9614 | ||
9615 | return -EINVAL; | |
9616 | } | |
9617 | ||
21b55dbc SG |
9618 | static int io_register_restrictions(struct io_ring_ctx *ctx, void __user *arg, |
9619 | unsigned int nr_args) | |
9620 | { | |
9621 | struct io_uring_restriction *res; | |
9622 | size_t size; | |
9623 | int i, ret; | |
9624 | ||
7e84e1c7 SG |
9625 | /* Restrictions allowed only if rings started disabled */ |
9626 | if (!(ctx->flags & IORING_SETUP_R_DISABLED)) | |
9627 | return -EBADFD; | |
9628 | ||
21b55dbc | 9629 | /* We allow only a single restrictions registration */ |
7e84e1c7 | 9630 | if (ctx->restrictions.registered) |
21b55dbc SG |
9631 | return -EBUSY; |
9632 | ||
9633 | if (!arg || nr_args > IORING_MAX_RESTRICTIONS) | |
9634 | return -EINVAL; | |
9635 | ||
9636 | size = array_size(nr_args, sizeof(*res)); | |
9637 | if (size == SIZE_MAX) | |
9638 | return -EOVERFLOW; | |
9639 | ||
9640 | res = memdup_user(arg, size); | |
9641 | if (IS_ERR(res)) | |
9642 | return PTR_ERR(res); | |
9643 | ||
9644 | ret = 0; | |
9645 | ||
9646 | for (i = 0; i < nr_args; i++) { | |
9647 | switch (res[i].opcode) { | |
9648 | case IORING_RESTRICTION_REGISTER_OP: | |
9649 | if (res[i].register_op >= IORING_REGISTER_LAST) { | |
9650 | ret = -EINVAL; | |
9651 | goto out; | |
9652 | } | |
9653 | ||
9654 | __set_bit(res[i].register_op, | |
9655 | ctx->restrictions.register_op); | |
9656 | break; | |
9657 | case IORING_RESTRICTION_SQE_OP: | |
9658 | if (res[i].sqe_op >= IORING_OP_LAST) { | |
9659 | ret = -EINVAL; | |
9660 | goto out; | |
9661 | } | |
9662 | ||
9663 | __set_bit(res[i].sqe_op, ctx->restrictions.sqe_op); | |
9664 | break; | |
9665 | case IORING_RESTRICTION_SQE_FLAGS_ALLOWED: | |
9666 | ctx->restrictions.sqe_flags_allowed = res[i].sqe_flags; | |
9667 | break; | |
9668 | case IORING_RESTRICTION_SQE_FLAGS_REQUIRED: | |
9669 | ctx->restrictions.sqe_flags_required = res[i].sqe_flags; | |
9670 | break; | |
9671 | default: | |
9672 | ret = -EINVAL; | |
9673 | goto out; | |
9674 | } | |
9675 | } | |
9676 | ||
9677 | out: | |
9678 | /* Reset all restrictions if an error happened */ | |
9679 | if (ret != 0) | |
9680 | memset(&ctx->restrictions, 0, sizeof(ctx->restrictions)); | |
9681 | else | |
7e84e1c7 | 9682 | ctx->restrictions.registered = true; |
21b55dbc SG |
9683 | |
9684 | kfree(res); | |
9685 | return ret; | |
9686 | } | |
9687 | ||
7e84e1c7 SG |
9688 | static int io_register_enable_rings(struct io_ring_ctx *ctx) |
9689 | { | |
9690 | if (!(ctx->flags & IORING_SETUP_R_DISABLED)) | |
9691 | return -EBADFD; | |
9692 | ||
9693 | if (ctx->restrictions.registered) | |
9694 | ctx->restricted = 1; | |
9695 | ||
9696 | ctx->flags &= ~IORING_SETUP_R_DISABLED; | |
9697 | ||
9698 | io_sq_offload_start(ctx); | |
9699 | ||
9700 | return 0; | |
9701 | } | |
9702 | ||
071698e1 JA |
9703 | static bool io_register_op_must_quiesce(int op) |
9704 | { | |
9705 | switch (op) { | |
9706 | case IORING_UNREGISTER_FILES: | |
9707 | case IORING_REGISTER_FILES_UPDATE: | |
9708 | case IORING_REGISTER_PROBE: | |
9709 | case IORING_REGISTER_PERSONALITY: | |
9710 | case IORING_UNREGISTER_PERSONALITY: | |
9711 | return false; | |
9712 | default: | |
9713 | return true; | |
9714 | } | |
9715 | } | |
9716 | ||
edafccee JA |
9717 | static int __io_uring_register(struct io_ring_ctx *ctx, unsigned opcode, |
9718 | void __user *arg, unsigned nr_args) | |
b19062a5 JA |
9719 | __releases(ctx->uring_lock) |
9720 | __acquires(ctx->uring_lock) | |
edafccee JA |
9721 | { |
9722 | int ret; | |
9723 | ||
35fa71a0 JA |
9724 | /* |
9725 | * We're inside the ring mutex, if the ref is already dying, then | |
9726 | * someone else killed the ctx or is already going through | |
9727 | * io_uring_register(). | |
9728 | */ | |
9729 | if (percpu_ref_is_dying(&ctx->refs)) | |
9730 | return -ENXIO; | |
9731 | ||
071698e1 | 9732 | if (io_register_op_must_quiesce(opcode)) { |
05f3fb3c | 9733 | percpu_ref_kill(&ctx->refs); |
b19062a5 | 9734 | |
05f3fb3c JA |
9735 | /* |
9736 | * Drop uring mutex before waiting for references to exit. If | |
9737 | * another thread is currently inside io_uring_enter() it might | |
9738 | * need to grab the uring_lock to make progress. If we hold it | |
9739 | * here across the drain wait, then we can deadlock. It's safe | |
9740 | * to drop the mutex here, since no new references will come in | |
9741 | * after we've killed the percpu ref. | |
9742 | */ | |
9743 | mutex_unlock(&ctx->uring_lock); | |
af9c1a44 JA |
9744 | do { |
9745 | ret = wait_for_completion_interruptible(&ctx->ref_comp); | |
9746 | if (!ret) | |
9747 | break; | |
ed6930c9 JA |
9748 | ret = io_run_task_work_sig(); |
9749 | if (ret < 0) | |
9750 | break; | |
af9c1a44 JA |
9751 | } while (1); |
9752 | ||
05f3fb3c | 9753 | mutex_lock(&ctx->uring_lock); |
af9c1a44 | 9754 | |
c150368b JA |
9755 | if (ret) { |
9756 | percpu_ref_resurrect(&ctx->refs); | |
21b55dbc SG |
9757 | goto out_quiesce; |
9758 | } | |
9759 | } | |
9760 | ||
9761 | if (ctx->restricted) { | |
9762 | if (opcode >= IORING_REGISTER_LAST) { | |
9763 | ret = -EINVAL; | |
9764 | goto out; | |
9765 | } | |
9766 | ||
9767 | if (!test_bit(opcode, ctx->restrictions.register_op)) { | |
9768 | ret = -EACCES; | |
c150368b JA |
9769 | goto out; |
9770 | } | |
05f3fb3c | 9771 | } |
edafccee JA |
9772 | |
9773 | switch (opcode) { | |
9774 | case IORING_REGISTER_BUFFERS: | |
9775 | ret = io_sqe_buffer_register(ctx, arg, nr_args); | |
9776 | break; | |
9777 | case IORING_UNREGISTER_BUFFERS: | |
9778 | ret = -EINVAL; | |
9779 | if (arg || nr_args) | |
9780 | break; | |
9781 | ret = io_sqe_buffer_unregister(ctx); | |
9782 | break; | |
6b06314c JA |
9783 | case IORING_REGISTER_FILES: |
9784 | ret = io_sqe_files_register(ctx, arg, nr_args); | |
9785 | break; | |
9786 | case IORING_UNREGISTER_FILES: | |
9787 | ret = -EINVAL; | |
9788 | if (arg || nr_args) | |
9789 | break; | |
9790 | ret = io_sqe_files_unregister(ctx); | |
9791 | break; | |
c3a31e60 JA |
9792 | case IORING_REGISTER_FILES_UPDATE: |
9793 | ret = io_sqe_files_update(ctx, arg, nr_args); | |
9794 | break; | |
9b402849 | 9795 | case IORING_REGISTER_EVENTFD: |
f2842ab5 | 9796 | case IORING_REGISTER_EVENTFD_ASYNC: |
9b402849 JA |
9797 | ret = -EINVAL; |
9798 | if (nr_args != 1) | |
9799 | break; | |
9800 | ret = io_eventfd_register(ctx, arg); | |
f2842ab5 JA |
9801 | if (ret) |
9802 | break; | |
9803 | if (opcode == IORING_REGISTER_EVENTFD_ASYNC) | |
9804 | ctx->eventfd_async = 1; | |
9805 | else | |
9806 | ctx->eventfd_async = 0; | |
9b402849 JA |
9807 | break; |
9808 | case IORING_UNREGISTER_EVENTFD: | |
9809 | ret = -EINVAL; | |
9810 | if (arg || nr_args) | |
9811 | break; | |
9812 | ret = io_eventfd_unregister(ctx); | |
9813 | break; | |
66f4af93 JA |
9814 | case IORING_REGISTER_PROBE: |
9815 | ret = -EINVAL; | |
9816 | if (!arg || nr_args > 256) | |
9817 | break; | |
9818 | ret = io_probe(ctx, arg, nr_args); | |
9819 | break; | |
071698e1 JA |
9820 | case IORING_REGISTER_PERSONALITY: |
9821 | ret = -EINVAL; | |
9822 | if (arg || nr_args) | |
9823 | break; | |
9824 | ret = io_register_personality(ctx); | |
9825 | break; | |
9826 | case IORING_UNREGISTER_PERSONALITY: | |
9827 | ret = -EINVAL; | |
9828 | if (arg) | |
9829 | break; | |
9830 | ret = io_unregister_personality(ctx, nr_args); | |
9831 | break; | |
7e84e1c7 SG |
9832 | case IORING_REGISTER_ENABLE_RINGS: |
9833 | ret = -EINVAL; | |
9834 | if (arg || nr_args) | |
9835 | break; | |
9836 | ret = io_register_enable_rings(ctx); | |
9837 | break; | |
21b55dbc SG |
9838 | case IORING_REGISTER_RESTRICTIONS: |
9839 | ret = io_register_restrictions(ctx, arg, nr_args); | |
9840 | break; | |
edafccee JA |
9841 | default: |
9842 | ret = -EINVAL; | |
9843 | break; | |
9844 | } | |
9845 | ||
21b55dbc | 9846 | out: |
071698e1 | 9847 | if (io_register_op_must_quiesce(opcode)) { |
05f3fb3c | 9848 | /* bring the ctx back to life */ |
05f3fb3c | 9849 | percpu_ref_reinit(&ctx->refs); |
21b55dbc | 9850 | out_quiesce: |
0f158b4c | 9851 | reinit_completion(&ctx->ref_comp); |
05f3fb3c | 9852 | } |
edafccee JA |
9853 | return ret; |
9854 | } | |
9855 | ||
9856 | SYSCALL_DEFINE4(io_uring_register, unsigned int, fd, unsigned int, opcode, | |
9857 | void __user *, arg, unsigned int, nr_args) | |
9858 | { | |
9859 | struct io_ring_ctx *ctx; | |
9860 | long ret = -EBADF; | |
9861 | struct fd f; | |
9862 | ||
9863 | f = fdget(fd); | |
9864 | if (!f.file) | |
9865 | return -EBADF; | |
9866 | ||
9867 | ret = -EOPNOTSUPP; | |
9868 | if (f.file->f_op != &io_uring_fops) | |
9869 | goto out_fput; | |
9870 | ||
9871 | ctx = f.file->private_data; | |
9872 | ||
9873 | mutex_lock(&ctx->uring_lock); | |
9874 | ret = __io_uring_register(ctx, opcode, arg, nr_args); | |
9875 | mutex_unlock(&ctx->uring_lock); | |
c826bd7a DD |
9876 | trace_io_uring_register(ctx, opcode, ctx->nr_user_files, ctx->nr_user_bufs, |
9877 | ctx->cq_ev_fd != NULL, ret); | |
edafccee JA |
9878 | out_fput: |
9879 | fdput(f); | |
9880 | return ret; | |
9881 | } | |
9882 | ||
2b188cc1 JA |
9883 | static int __init io_uring_init(void) |
9884 | { | |
d7f62e82 SM |
9885 | #define __BUILD_BUG_VERIFY_ELEMENT(stype, eoffset, etype, ename) do { \ |
9886 | BUILD_BUG_ON(offsetof(stype, ename) != eoffset); \ | |
9887 | BUILD_BUG_ON(sizeof(etype) != sizeof_field(stype, ename)); \ | |
9888 | } while (0) | |
9889 | ||
9890 | #define BUILD_BUG_SQE_ELEM(eoffset, etype, ename) \ | |
9891 | __BUILD_BUG_VERIFY_ELEMENT(struct io_uring_sqe, eoffset, etype, ename) | |
9892 | BUILD_BUG_ON(sizeof(struct io_uring_sqe) != 64); | |
9893 | BUILD_BUG_SQE_ELEM(0, __u8, opcode); | |
9894 | BUILD_BUG_SQE_ELEM(1, __u8, flags); | |
9895 | BUILD_BUG_SQE_ELEM(2, __u16, ioprio); | |
9896 | BUILD_BUG_SQE_ELEM(4, __s32, fd); | |
9897 | BUILD_BUG_SQE_ELEM(8, __u64, off); | |
9898 | BUILD_BUG_SQE_ELEM(8, __u64, addr2); | |
9899 | BUILD_BUG_SQE_ELEM(16, __u64, addr); | |
7d67af2c | 9900 | BUILD_BUG_SQE_ELEM(16, __u64, splice_off_in); |
d7f62e82 SM |
9901 | BUILD_BUG_SQE_ELEM(24, __u32, len); |
9902 | BUILD_BUG_SQE_ELEM(28, __kernel_rwf_t, rw_flags); | |
9903 | BUILD_BUG_SQE_ELEM(28, /* compat */ int, rw_flags); | |
9904 | BUILD_BUG_SQE_ELEM(28, /* compat */ __u32, rw_flags); | |
9905 | BUILD_BUG_SQE_ELEM(28, __u32, fsync_flags); | |
5769a351 JX |
9906 | BUILD_BUG_SQE_ELEM(28, /* compat */ __u16, poll_events); |
9907 | BUILD_BUG_SQE_ELEM(28, __u32, poll32_events); | |
d7f62e82 SM |
9908 | BUILD_BUG_SQE_ELEM(28, __u32, sync_range_flags); |
9909 | BUILD_BUG_SQE_ELEM(28, __u32, msg_flags); | |
9910 | BUILD_BUG_SQE_ELEM(28, __u32, timeout_flags); | |
9911 | BUILD_BUG_SQE_ELEM(28, __u32, accept_flags); | |
9912 | BUILD_BUG_SQE_ELEM(28, __u32, cancel_flags); | |
9913 | BUILD_BUG_SQE_ELEM(28, __u32, open_flags); | |
9914 | BUILD_BUG_SQE_ELEM(28, __u32, statx_flags); | |
9915 | BUILD_BUG_SQE_ELEM(28, __u32, fadvise_advice); | |
7d67af2c | 9916 | BUILD_BUG_SQE_ELEM(28, __u32, splice_flags); |
d7f62e82 SM |
9917 | BUILD_BUG_SQE_ELEM(32, __u64, user_data); |
9918 | BUILD_BUG_SQE_ELEM(40, __u16, buf_index); | |
9919 | BUILD_BUG_SQE_ELEM(42, __u16, personality); | |
7d67af2c | 9920 | BUILD_BUG_SQE_ELEM(44, __s32, splice_fd_in); |
d7f62e82 | 9921 | |
d3656344 | 9922 | BUILD_BUG_ON(ARRAY_SIZE(io_op_defs) != IORING_OP_LAST); |
84557871 | 9923 | BUILD_BUG_ON(__REQ_F_LAST_BIT >= 8 * sizeof(int)); |
2b188cc1 JA |
9924 | req_cachep = KMEM_CACHE(io_kiocb, SLAB_HWCACHE_ALIGN | SLAB_PANIC); |
9925 | return 0; | |
9926 | }; | |
9927 | __initcall(io_uring_init); |