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2b188cc1 JA |
1 | // SPDX-License-Identifier: GPL-2.0 |
2 | /* | |
3 | * Shared application/kernel submission and completion ring pairs, for | |
4 | * supporting fast/efficient IO. | |
5 | * | |
6 | * A note on the read/write ordering memory barriers that are matched between | |
1e84b97b SB |
7 | * the application and kernel side. |
8 | * | |
9 | * After the application reads the CQ ring tail, it must use an | |
10 | * appropriate smp_rmb() to pair with the smp_wmb() the kernel uses | |
11 | * before writing the tail (using smp_load_acquire to read the tail will | |
12 | * do). It also needs a smp_mb() before updating CQ head (ordering the | |
13 | * entry load(s) with the head store), pairing with an implicit barrier | |
14 | * through a control-dependency in io_get_cqring (smp_store_release to | |
15 | * store head will do). Failure to do so could lead to reading invalid | |
16 | * CQ entries. | |
17 | * | |
18 | * Likewise, the application must use an appropriate smp_wmb() before | |
19 | * writing the SQ tail (ordering SQ entry stores with the tail store), | |
20 | * which pairs with smp_load_acquire in io_get_sqring (smp_store_release | |
21 | * to store the tail will do). And it needs a barrier ordering the SQ | |
22 | * head load before writing new SQ entries (smp_load_acquire to read | |
23 | * head will do). | |
24 | * | |
25 | * When using the SQ poll thread (IORING_SETUP_SQPOLL), the application | |
26 | * needs to check the SQ flags for IORING_SQ_NEED_WAKEUP *after* | |
27 | * updating the SQ tail; a full memory barrier smp_mb() is needed | |
28 | * between. | |
2b188cc1 JA |
29 | * |
30 | * Also see the examples in the liburing library: | |
31 | * | |
32 | * git://git.kernel.dk/liburing | |
33 | * | |
34 | * io_uring also uses READ/WRITE_ONCE() for _any_ store or load that happens | |
35 | * from data shared between the kernel and application. This is done both | |
36 | * for ordering purposes, but also to ensure that once a value is loaded from | |
37 | * data that the application could potentially modify, it remains stable. | |
38 | * | |
39 | * Copyright (C) 2018-2019 Jens Axboe | |
c992fe29 | 40 | * Copyright (c) 2018-2019 Christoph Hellwig |
2b188cc1 JA |
41 | */ |
42 | #include <linux/kernel.h> | |
43 | #include <linux/init.h> | |
44 | #include <linux/errno.h> | |
45 | #include <linux/syscalls.h> | |
46 | #include <linux/compat.h> | |
52de1fe1 | 47 | #include <net/compat.h> |
2b188cc1 JA |
48 | #include <linux/refcount.h> |
49 | #include <linux/uio.h> | |
6b47ee6e | 50 | #include <linux/bits.h> |
2b188cc1 JA |
51 | |
52 | #include <linux/sched/signal.h> | |
53 | #include <linux/fs.h> | |
54 | #include <linux/file.h> | |
55 | #include <linux/fdtable.h> | |
56 | #include <linux/mm.h> | |
57 | #include <linux/mman.h> | |
2b188cc1 JA |
58 | #include <linux/percpu.h> |
59 | #include <linux/slab.h> | |
6c271ce2 | 60 | #include <linux/kthread.h> |
2b188cc1 | 61 | #include <linux/blkdev.h> |
edafccee | 62 | #include <linux/bvec.h> |
2b188cc1 JA |
63 | #include <linux/net.h> |
64 | #include <net/sock.h> | |
65 | #include <net/af_unix.h> | |
6b06314c | 66 | #include <net/scm.h> |
2b188cc1 JA |
67 | #include <linux/anon_inodes.h> |
68 | #include <linux/sched/mm.h> | |
69 | #include <linux/uaccess.h> | |
70 | #include <linux/nospec.h> | |
edafccee JA |
71 | #include <linux/sizes.h> |
72 | #include <linux/hugetlb.h> | |
aa4c3967 | 73 | #include <linux/highmem.h> |
15b71abe JA |
74 | #include <linux/namei.h> |
75 | #include <linux/fsnotify.h> | |
4840e418 | 76 | #include <linux/fadvise.h> |
3e4827b0 | 77 | #include <linux/eventpoll.h> |
ff002b30 | 78 | #include <linux/fs_struct.h> |
7d67af2c | 79 | #include <linux/splice.h> |
b41e9852 | 80 | #include <linux/task_work.h> |
bcf5a063 | 81 | #include <linux/pagemap.h> |
0f212204 | 82 | #include <linux/io_uring.h> |
91d8f519 | 83 | #include <linux/blk-cgroup.h> |
4ea33a97 | 84 | #include <linux/audit.h> |
2b188cc1 | 85 | |
c826bd7a DD |
86 | #define CREATE_TRACE_POINTS |
87 | #include <trace/events/io_uring.h> | |
88 | ||
2b188cc1 JA |
89 | #include <uapi/linux/io_uring.h> |
90 | ||
91 | #include "internal.h" | |
561fb04a | 92 | #include "io-wq.h" |
2b188cc1 | 93 | |
5277deaa | 94 | #define IORING_MAX_ENTRIES 32768 |
33a107f0 | 95 | #define IORING_MAX_CQ_ENTRIES (2 * IORING_MAX_ENTRIES) |
65e19f54 JA |
96 | |
97 | /* | |
98 | * Shift of 9 is 512 entries, or exactly one page on 64-bit archs | |
99 | */ | |
100 | #define IORING_FILE_TABLE_SHIFT 9 | |
101 | #define IORING_MAX_FILES_TABLE (1U << IORING_FILE_TABLE_SHIFT) | |
102 | #define IORING_FILE_TABLE_MASK (IORING_MAX_FILES_TABLE - 1) | |
103 | #define IORING_MAX_FIXED_FILES (64 * IORING_MAX_FILES_TABLE) | |
21b55dbc SG |
104 | #define IORING_MAX_RESTRICTIONS (IORING_RESTRICTION_LAST + \ |
105 | IORING_REGISTER_LAST + IORING_OP_LAST) | |
2b188cc1 JA |
106 | |
107 | struct io_uring { | |
108 | u32 head ____cacheline_aligned_in_smp; | |
109 | u32 tail ____cacheline_aligned_in_smp; | |
110 | }; | |
111 | ||
1e84b97b | 112 | /* |
75b28aff HV |
113 | * This data is shared with the application through the mmap at offsets |
114 | * IORING_OFF_SQ_RING and IORING_OFF_CQ_RING. | |
1e84b97b SB |
115 | * |
116 | * The offsets to the member fields are published through struct | |
117 | * io_sqring_offsets when calling io_uring_setup. | |
118 | */ | |
75b28aff | 119 | struct io_rings { |
1e84b97b SB |
120 | /* |
121 | * Head and tail offsets into the ring; the offsets need to be | |
122 | * masked to get valid indices. | |
123 | * | |
75b28aff HV |
124 | * The kernel controls head of the sq ring and the tail of the cq ring, |
125 | * and the application controls tail of the sq ring and the head of the | |
126 | * cq ring. | |
1e84b97b | 127 | */ |
75b28aff | 128 | struct io_uring sq, cq; |
1e84b97b | 129 | /* |
75b28aff | 130 | * Bitmasks to apply to head and tail offsets (constant, equals |
1e84b97b SB |
131 | * ring_entries - 1) |
132 | */ | |
75b28aff HV |
133 | u32 sq_ring_mask, cq_ring_mask; |
134 | /* Ring sizes (constant, power of 2) */ | |
135 | u32 sq_ring_entries, cq_ring_entries; | |
1e84b97b SB |
136 | /* |
137 | * Number of invalid entries dropped by the kernel due to | |
138 | * invalid index stored in array | |
139 | * | |
140 | * Written by the kernel, shouldn't be modified by the | |
141 | * application (i.e. get number of "new events" by comparing to | |
142 | * cached value). | |
143 | * | |
144 | * After a new SQ head value was read by the application this | |
145 | * counter includes all submissions that were dropped reaching | |
146 | * the new SQ head (and possibly more). | |
147 | */ | |
75b28aff | 148 | u32 sq_dropped; |
1e84b97b | 149 | /* |
0d9b5b3a | 150 | * Runtime SQ flags |
1e84b97b SB |
151 | * |
152 | * Written by the kernel, shouldn't be modified by the | |
153 | * application. | |
154 | * | |
155 | * The application needs a full memory barrier before checking | |
156 | * for IORING_SQ_NEED_WAKEUP after updating the sq tail. | |
157 | */ | |
75b28aff | 158 | u32 sq_flags; |
0d9b5b3a SG |
159 | /* |
160 | * Runtime CQ flags | |
161 | * | |
162 | * Written by the application, shouldn't be modified by the | |
163 | * kernel. | |
164 | */ | |
165 | u32 cq_flags; | |
1e84b97b SB |
166 | /* |
167 | * Number of completion events lost because the queue was full; | |
168 | * this should be avoided by the application by making sure | |
0b4295b5 | 169 | * there are not more requests pending than there is space in |
1e84b97b SB |
170 | * the completion queue. |
171 | * | |
172 | * Written by the kernel, shouldn't be modified by the | |
173 | * application (i.e. get number of "new events" by comparing to | |
174 | * cached value). | |
175 | * | |
176 | * As completion events come in out of order this counter is not | |
177 | * ordered with any other data. | |
178 | */ | |
75b28aff | 179 | u32 cq_overflow; |
1e84b97b SB |
180 | /* |
181 | * Ring buffer of completion events. | |
182 | * | |
183 | * The kernel writes completion events fresh every time they are | |
184 | * produced, so the application is allowed to modify pending | |
185 | * entries. | |
186 | */ | |
75b28aff | 187 | struct io_uring_cqe cqes[] ____cacheline_aligned_in_smp; |
2b188cc1 JA |
188 | }; |
189 | ||
edafccee JA |
190 | struct io_mapped_ubuf { |
191 | u64 ubuf; | |
192 | size_t len; | |
193 | struct bio_vec *bvec; | |
194 | unsigned int nr_bvecs; | |
de293938 | 195 | unsigned long acct_pages; |
edafccee JA |
196 | }; |
197 | ||
65e19f54 JA |
198 | struct fixed_file_table { |
199 | struct file **files; | |
31b51510 JA |
200 | }; |
201 | ||
05589553 XW |
202 | struct fixed_file_ref_node { |
203 | struct percpu_ref refs; | |
204 | struct list_head node; | |
205 | struct list_head file_list; | |
206 | struct fixed_file_data *file_data; | |
4a38aed2 | 207 | struct llist_node llist; |
05589553 XW |
208 | }; |
209 | ||
05f3fb3c JA |
210 | struct fixed_file_data { |
211 | struct fixed_file_table *table; | |
212 | struct io_ring_ctx *ctx; | |
213 | ||
b2e96852 | 214 | struct fixed_file_ref_node *node; |
05f3fb3c | 215 | struct percpu_ref refs; |
05f3fb3c | 216 | struct completion done; |
05589553 XW |
217 | struct list_head ref_list; |
218 | spinlock_t lock; | |
05f3fb3c JA |
219 | }; |
220 | ||
5a2e745d JA |
221 | struct io_buffer { |
222 | struct list_head list; | |
223 | __u64 addr; | |
224 | __s32 len; | |
225 | __u16 bid; | |
226 | }; | |
227 | ||
21b55dbc SG |
228 | struct io_restriction { |
229 | DECLARE_BITMAP(register_op, IORING_REGISTER_LAST); | |
230 | DECLARE_BITMAP(sqe_op, IORING_OP_LAST); | |
231 | u8 sqe_flags_allowed; | |
232 | u8 sqe_flags_required; | |
7e84e1c7 | 233 | bool registered; |
21b55dbc SG |
234 | }; |
235 | ||
534ca6d6 JA |
236 | struct io_sq_data { |
237 | refcount_t refs; | |
69fb2131 JA |
238 | struct mutex lock; |
239 | ||
240 | /* ctx's that are using this sqd */ | |
241 | struct list_head ctx_list; | |
242 | struct list_head ctx_new_list; | |
243 | struct mutex ctx_lock; | |
244 | ||
534ca6d6 JA |
245 | struct task_struct *thread; |
246 | struct wait_queue_head wait; | |
247 | }; | |
248 | ||
2b188cc1 JA |
249 | struct io_ring_ctx { |
250 | struct { | |
251 | struct percpu_ref refs; | |
252 | } ____cacheline_aligned_in_smp; | |
253 | ||
254 | struct { | |
255 | unsigned int flags; | |
e1d85334 | 256 | unsigned int compat: 1; |
aad5d8da | 257 | unsigned int limit_mem: 1; |
e1d85334 RD |
258 | unsigned int cq_overflow_flushed: 1; |
259 | unsigned int drain_next: 1; | |
260 | unsigned int eventfd_async: 1; | |
21b55dbc | 261 | unsigned int restricted: 1; |
2b188cc1 | 262 | |
75b28aff HV |
263 | /* |
264 | * Ring buffer of indices into array of io_uring_sqe, which is | |
265 | * mmapped by the application using the IORING_OFF_SQES offset. | |
266 | * | |
267 | * This indirection could e.g. be used to assign fixed | |
268 | * io_uring_sqe entries to operations and only submit them to | |
269 | * the queue when needed. | |
270 | * | |
271 | * The kernel modifies neither the indices array nor the entries | |
272 | * array. | |
273 | */ | |
274 | u32 *sq_array; | |
2b188cc1 JA |
275 | unsigned cached_sq_head; |
276 | unsigned sq_entries; | |
277 | unsigned sq_mask; | |
6c271ce2 | 278 | unsigned sq_thread_idle; |
498ccd9e | 279 | unsigned cached_sq_dropped; |
2c3bac6d | 280 | unsigned cached_cq_overflow; |
ad3eb2c8 | 281 | unsigned long sq_check_overflow; |
de0617e4 JA |
282 | |
283 | struct list_head defer_list; | |
5262f567 | 284 | struct list_head timeout_list; |
1d7bb1d5 | 285 | struct list_head cq_overflow_list; |
fcb323cc JA |
286 | |
287 | wait_queue_head_t inflight_wait; | |
ad3eb2c8 | 288 | struct io_uring_sqe *sq_sqes; |
2b188cc1 JA |
289 | } ____cacheline_aligned_in_smp; |
290 | ||
206aefde JA |
291 | struct io_rings *rings; |
292 | ||
2b188cc1 | 293 | /* IO offload */ |
561fb04a | 294 | struct io_wq *io_wq; |
2aede0e4 JA |
295 | |
296 | /* | |
297 | * For SQPOLL usage - we hold a reference to the parent task, so we | |
298 | * have access to the ->files | |
299 | */ | |
300 | struct task_struct *sqo_task; | |
301 | ||
302 | /* Only used for accounting purposes */ | |
303 | struct mm_struct *mm_account; | |
304 | ||
91d8f519 DZ |
305 | #ifdef CONFIG_BLK_CGROUP |
306 | struct cgroup_subsys_state *sqo_blkcg_css; | |
307 | #endif | |
308 | ||
534ca6d6 JA |
309 | struct io_sq_data *sq_data; /* if using sq thread polling */ |
310 | ||
90554200 | 311 | struct wait_queue_head sqo_sq_wait; |
6a779382 | 312 | struct wait_queue_entry sqo_wait_entry; |
69fb2131 | 313 | struct list_head sqd_list; |
75b28aff | 314 | |
6b06314c JA |
315 | /* |
316 | * If used, fixed file set. Writers must ensure that ->refs is dead, | |
317 | * readers must ensure that ->refs is alive as long as the file* is | |
318 | * used. Only updated through io_uring_register(2). | |
319 | */ | |
05f3fb3c | 320 | struct fixed_file_data *file_data; |
6b06314c JA |
321 | unsigned nr_user_files; |
322 | ||
edafccee JA |
323 | /* if used, fixed mapped user buffers */ |
324 | unsigned nr_user_bufs; | |
325 | struct io_mapped_ubuf *user_bufs; | |
326 | ||
2b188cc1 JA |
327 | struct user_struct *user; |
328 | ||
0b8c0ec7 | 329 | const struct cred *creds; |
181e448d | 330 | |
4ea33a97 JA |
331 | #ifdef CONFIG_AUDIT |
332 | kuid_t loginuid; | |
333 | unsigned int sessionid; | |
334 | #endif | |
335 | ||
0f158b4c JA |
336 | struct completion ref_comp; |
337 | struct completion sq_thread_comp; | |
206aefde | 338 | |
0ddf92e8 JA |
339 | /* if all else fails... */ |
340 | struct io_kiocb *fallback_req; | |
341 | ||
206aefde JA |
342 | #if defined(CONFIG_UNIX) |
343 | struct socket *ring_sock; | |
344 | #endif | |
345 | ||
5a2e745d JA |
346 | struct idr io_buffer_idr; |
347 | ||
071698e1 JA |
348 | struct idr personality_idr; |
349 | ||
206aefde JA |
350 | struct { |
351 | unsigned cached_cq_tail; | |
352 | unsigned cq_entries; | |
353 | unsigned cq_mask; | |
354 | atomic_t cq_timeouts; | |
ad3eb2c8 | 355 | unsigned long cq_check_overflow; |
206aefde JA |
356 | struct wait_queue_head cq_wait; |
357 | struct fasync_struct *cq_fasync; | |
358 | struct eventfd_ctx *cq_ev_fd; | |
359 | } ____cacheline_aligned_in_smp; | |
2b188cc1 JA |
360 | |
361 | struct { | |
362 | struct mutex uring_lock; | |
363 | wait_queue_head_t wait; | |
364 | } ____cacheline_aligned_in_smp; | |
365 | ||
366 | struct { | |
367 | spinlock_t completion_lock; | |
e94f141b | 368 | |
def596e9 | 369 | /* |
540e32a0 | 370 | * ->iopoll_list is protected by the ctx->uring_lock for |
def596e9 JA |
371 | * io_uring instances that don't use IORING_SETUP_SQPOLL. |
372 | * For SQPOLL, only the single threaded io_sq_thread() will | |
373 | * manipulate the list, hence no extra locking is needed there. | |
374 | */ | |
540e32a0 | 375 | struct list_head iopoll_list; |
78076bb6 JA |
376 | struct hlist_head *cancel_hash; |
377 | unsigned cancel_hash_bits; | |
e94f141b | 378 | bool poll_multi_file; |
31b51510 | 379 | |
fcb323cc JA |
380 | spinlock_t inflight_lock; |
381 | struct list_head inflight_list; | |
2b188cc1 | 382 | } ____cacheline_aligned_in_smp; |
85faa7b8 | 383 | |
4a38aed2 JA |
384 | struct delayed_work file_put_work; |
385 | struct llist_head file_put_llist; | |
386 | ||
85faa7b8 | 387 | struct work_struct exit_work; |
21b55dbc | 388 | struct io_restriction restrictions; |
2b188cc1 JA |
389 | }; |
390 | ||
09bb8394 JA |
391 | /* |
392 | * First field must be the file pointer in all the | |
393 | * iocb unions! See also 'struct kiocb' in <linux/fs.h> | |
394 | */ | |
221c5eb2 JA |
395 | struct io_poll_iocb { |
396 | struct file *file; | |
0969e783 JA |
397 | union { |
398 | struct wait_queue_head *head; | |
399 | u64 addr; | |
400 | }; | |
221c5eb2 | 401 | __poll_t events; |
8c838788 | 402 | bool done; |
221c5eb2 | 403 | bool canceled; |
392edb45 | 404 | struct wait_queue_entry wait; |
221c5eb2 JA |
405 | }; |
406 | ||
b5dba59e JA |
407 | struct io_close { |
408 | struct file *file; | |
409 | struct file *put_file; | |
410 | int fd; | |
411 | }; | |
412 | ||
ad8a48ac JA |
413 | struct io_timeout_data { |
414 | struct io_kiocb *req; | |
415 | struct hrtimer timer; | |
416 | struct timespec64 ts; | |
417 | enum hrtimer_mode mode; | |
418 | }; | |
419 | ||
8ed8d3c3 JA |
420 | struct io_accept { |
421 | struct file *file; | |
422 | struct sockaddr __user *addr; | |
423 | int __user *addr_len; | |
424 | int flags; | |
09952e3e | 425 | unsigned long nofile; |
8ed8d3c3 JA |
426 | }; |
427 | ||
428 | struct io_sync { | |
429 | struct file *file; | |
430 | loff_t len; | |
431 | loff_t off; | |
432 | int flags; | |
d63d1b5e | 433 | int mode; |
8ed8d3c3 JA |
434 | }; |
435 | ||
fbf23849 JA |
436 | struct io_cancel { |
437 | struct file *file; | |
438 | u64 addr; | |
439 | }; | |
440 | ||
b29472ee JA |
441 | struct io_timeout { |
442 | struct file *file; | |
bfe68a22 PB |
443 | u32 off; |
444 | u32 target_seq; | |
135fcde8 | 445 | struct list_head list; |
b29472ee JA |
446 | }; |
447 | ||
0bdf7a2d PB |
448 | struct io_timeout_rem { |
449 | struct file *file; | |
450 | u64 addr; | |
451 | }; | |
452 | ||
9adbd45d JA |
453 | struct io_rw { |
454 | /* NOTE: kiocb has the file as the first member, so don't do it here */ | |
455 | struct kiocb kiocb; | |
456 | u64 addr; | |
457 | u64 len; | |
458 | }; | |
459 | ||
3fbb51c1 JA |
460 | struct io_connect { |
461 | struct file *file; | |
462 | struct sockaddr __user *addr; | |
463 | int addr_len; | |
464 | }; | |
465 | ||
e47293fd JA |
466 | struct io_sr_msg { |
467 | struct file *file; | |
fddaface | 468 | union { |
270a5940 | 469 | struct user_msghdr __user *umsg; |
fddaface JA |
470 | void __user *buf; |
471 | }; | |
e47293fd | 472 | int msg_flags; |
bcda7baa | 473 | int bgid; |
fddaface | 474 | size_t len; |
bcda7baa | 475 | struct io_buffer *kbuf; |
e47293fd JA |
476 | }; |
477 | ||
15b71abe JA |
478 | struct io_open { |
479 | struct file *file; | |
480 | int dfd; | |
15b71abe | 481 | struct filename *filename; |
c12cedf2 | 482 | struct open_how how; |
4022e7af | 483 | unsigned long nofile; |
15b71abe JA |
484 | }; |
485 | ||
05f3fb3c JA |
486 | struct io_files_update { |
487 | struct file *file; | |
488 | u64 arg; | |
489 | u32 nr_args; | |
490 | u32 offset; | |
491 | }; | |
492 | ||
4840e418 JA |
493 | struct io_fadvise { |
494 | struct file *file; | |
495 | u64 offset; | |
496 | u32 len; | |
497 | u32 advice; | |
498 | }; | |
499 | ||
c1ca757b JA |
500 | struct io_madvise { |
501 | struct file *file; | |
502 | u64 addr; | |
503 | u32 len; | |
504 | u32 advice; | |
505 | }; | |
506 | ||
3e4827b0 JA |
507 | struct io_epoll { |
508 | struct file *file; | |
509 | int epfd; | |
510 | int op; | |
511 | int fd; | |
512 | struct epoll_event event; | |
e47293fd JA |
513 | }; |
514 | ||
7d67af2c PB |
515 | struct io_splice { |
516 | struct file *file_out; | |
517 | struct file *file_in; | |
518 | loff_t off_out; | |
519 | loff_t off_in; | |
520 | u64 len; | |
521 | unsigned int flags; | |
522 | }; | |
523 | ||
ddf0322d JA |
524 | struct io_provide_buf { |
525 | struct file *file; | |
526 | __u64 addr; | |
527 | __s32 len; | |
528 | __u32 bgid; | |
529 | __u16 nbufs; | |
530 | __u16 bid; | |
531 | }; | |
532 | ||
1d9e1288 BM |
533 | struct io_statx { |
534 | struct file *file; | |
535 | int dfd; | |
536 | unsigned int mask; | |
537 | unsigned int flags; | |
e62753e4 | 538 | const char __user *filename; |
1d9e1288 BM |
539 | struct statx __user *buffer; |
540 | }; | |
541 | ||
3ca405eb PB |
542 | struct io_completion { |
543 | struct file *file; | |
544 | struct list_head list; | |
0f7e466b | 545 | int cflags; |
3ca405eb PB |
546 | }; |
547 | ||
f499a021 JA |
548 | struct io_async_connect { |
549 | struct sockaddr_storage address; | |
550 | }; | |
551 | ||
03b1230c JA |
552 | struct io_async_msghdr { |
553 | struct iovec fast_iov[UIO_FASTIOV]; | |
554 | struct iovec *iov; | |
555 | struct sockaddr __user *uaddr; | |
556 | struct msghdr msg; | |
b537916c | 557 | struct sockaddr_storage addr; |
03b1230c JA |
558 | }; |
559 | ||
f67676d1 JA |
560 | struct io_async_rw { |
561 | struct iovec fast_iov[UIO_FASTIOV]; | |
ff6165b2 JA |
562 | const struct iovec *free_iovec; |
563 | struct iov_iter iter; | |
227c0c96 | 564 | size_t bytes_done; |
bcf5a063 | 565 | struct wait_page_queue wpq; |
f67676d1 JA |
566 | }; |
567 | ||
6b47ee6e PB |
568 | enum { |
569 | REQ_F_FIXED_FILE_BIT = IOSQE_FIXED_FILE_BIT, | |
570 | REQ_F_IO_DRAIN_BIT = IOSQE_IO_DRAIN_BIT, | |
571 | REQ_F_LINK_BIT = IOSQE_IO_LINK_BIT, | |
572 | REQ_F_HARDLINK_BIT = IOSQE_IO_HARDLINK_BIT, | |
573 | REQ_F_FORCE_ASYNC_BIT = IOSQE_ASYNC_BIT, | |
bcda7baa | 574 | REQ_F_BUFFER_SELECT_BIT = IOSQE_BUFFER_SELECT_BIT, |
6b47ee6e | 575 | |
dea3b49c | 576 | REQ_F_LINK_HEAD_BIT, |
6b47ee6e PB |
577 | REQ_F_FAIL_LINK_BIT, |
578 | REQ_F_INFLIGHT_BIT, | |
579 | REQ_F_CUR_POS_BIT, | |
580 | REQ_F_NOWAIT_BIT, | |
6b47ee6e | 581 | REQ_F_LINK_TIMEOUT_BIT, |
6b47ee6e | 582 | REQ_F_ISREG_BIT, |
99bc4c38 | 583 | REQ_F_NEED_CLEANUP_BIT, |
d7718a9d | 584 | REQ_F_POLLED_BIT, |
bcda7baa | 585 | REQ_F_BUFFER_SELECTED_BIT, |
5b0bbee4 | 586 | REQ_F_NO_FILE_TABLE_BIT, |
7cdaf587 | 587 | REQ_F_WORK_INITIALIZED_BIT, |
84557871 JA |
588 | |
589 | /* not a real bit, just to check we're not overflowing the space */ | |
590 | __REQ_F_LAST_BIT, | |
6b47ee6e PB |
591 | }; |
592 | ||
593 | enum { | |
594 | /* ctx owns file */ | |
595 | REQ_F_FIXED_FILE = BIT(REQ_F_FIXED_FILE_BIT), | |
596 | /* drain existing IO first */ | |
597 | REQ_F_IO_DRAIN = BIT(REQ_F_IO_DRAIN_BIT), | |
598 | /* linked sqes */ | |
599 | REQ_F_LINK = BIT(REQ_F_LINK_BIT), | |
600 | /* doesn't sever on completion < 0 */ | |
601 | REQ_F_HARDLINK = BIT(REQ_F_HARDLINK_BIT), | |
602 | /* IOSQE_ASYNC */ | |
603 | REQ_F_FORCE_ASYNC = BIT(REQ_F_FORCE_ASYNC_BIT), | |
bcda7baa JA |
604 | /* IOSQE_BUFFER_SELECT */ |
605 | REQ_F_BUFFER_SELECT = BIT(REQ_F_BUFFER_SELECT_BIT), | |
6b47ee6e | 606 | |
dea3b49c PB |
607 | /* head of a link */ |
608 | REQ_F_LINK_HEAD = BIT(REQ_F_LINK_HEAD_BIT), | |
6b47ee6e PB |
609 | /* fail rest of links */ |
610 | REQ_F_FAIL_LINK = BIT(REQ_F_FAIL_LINK_BIT), | |
611 | /* on inflight list */ | |
612 | REQ_F_INFLIGHT = BIT(REQ_F_INFLIGHT_BIT), | |
613 | /* read/write uses file position */ | |
614 | REQ_F_CUR_POS = BIT(REQ_F_CUR_POS_BIT), | |
615 | /* must not punt to workers */ | |
616 | REQ_F_NOWAIT = BIT(REQ_F_NOWAIT_BIT), | |
6b47ee6e PB |
617 | /* has linked timeout */ |
618 | REQ_F_LINK_TIMEOUT = BIT(REQ_F_LINK_TIMEOUT_BIT), | |
6b47ee6e PB |
619 | /* regular file */ |
620 | REQ_F_ISREG = BIT(REQ_F_ISREG_BIT), | |
99bc4c38 PB |
621 | /* needs cleanup */ |
622 | REQ_F_NEED_CLEANUP = BIT(REQ_F_NEED_CLEANUP_BIT), | |
d7718a9d JA |
623 | /* already went through poll handler */ |
624 | REQ_F_POLLED = BIT(REQ_F_POLLED_BIT), | |
bcda7baa JA |
625 | /* buffer already selected */ |
626 | REQ_F_BUFFER_SELECTED = BIT(REQ_F_BUFFER_SELECTED_BIT), | |
5b0bbee4 JA |
627 | /* doesn't need file table for this request */ |
628 | REQ_F_NO_FILE_TABLE = BIT(REQ_F_NO_FILE_TABLE_BIT), | |
7cdaf587 XW |
629 | /* io_wq_work is initialized */ |
630 | REQ_F_WORK_INITIALIZED = BIT(REQ_F_WORK_INITIALIZED_BIT), | |
d7718a9d JA |
631 | }; |
632 | ||
633 | struct async_poll { | |
634 | struct io_poll_iocb poll; | |
807abcb0 | 635 | struct io_poll_iocb *double_poll; |
6b47ee6e PB |
636 | }; |
637 | ||
09bb8394 JA |
638 | /* |
639 | * NOTE! Each of the iocb union members has the file pointer | |
640 | * as the first entry in their struct definition. So you can | |
641 | * access the file pointer through any of the sub-structs, | |
642 | * or directly as just 'ki_filp' in this struct. | |
643 | */ | |
2b188cc1 | 644 | struct io_kiocb { |
221c5eb2 | 645 | union { |
09bb8394 | 646 | struct file *file; |
9adbd45d | 647 | struct io_rw rw; |
221c5eb2 | 648 | struct io_poll_iocb poll; |
8ed8d3c3 JA |
649 | struct io_accept accept; |
650 | struct io_sync sync; | |
fbf23849 | 651 | struct io_cancel cancel; |
b29472ee | 652 | struct io_timeout timeout; |
0bdf7a2d | 653 | struct io_timeout_rem timeout_rem; |
3fbb51c1 | 654 | struct io_connect connect; |
e47293fd | 655 | struct io_sr_msg sr_msg; |
15b71abe | 656 | struct io_open open; |
b5dba59e | 657 | struct io_close close; |
05f3fb3c | 658 | struct io_files_update files_update; |
4840e418 | 659 | struct io_fadvise fadvise; |
c1ca757b | 660 | struct io_madvise madvise; |
3e4827b0 | 661 | struct io_epoll epoll; |
7d67af2c | 662 | struct io_splice splice; |
ddf0322d | 663 | struct io_provide_buf pbuf; |
1d9e1288 | 664 | struct io_statx statx; |
3ca405eb PB |
665 | /* use only after cleaning per-op data, see io_clean_op() */ |
666 | struct io_completion compl; | |
221c5eb2 | 667 | }; |
2b188cc1 | 668 | |
e8c2bc1f JA |
669 | /* opcode allocated if it needs to store data for async defer */ |
670 | void *async_data; | |
d625c6ee | 671 | u8 opcode; |
65a6543d XW |
672 | /* polled IO has completed */ |
673 | u8 iopoll_completed; | |
2b188cc1 | 674 | |
4f4eeba8 | 675 | u16 buf_index; |
9cf7c104 | 676 | u32 result; |
4f4eeba8 | 677 | |
010e8e6b PB |
678 | struct io_ring_ctx *ctx; |
679 | unsigned int flags; | |
680 | refcount_t refs; | |
681 | struct task_struct *task; | |
682 | u64 user_data; | |
d7718a9d | 683 | |
010e8e6b | 684 | struct list_head link_list; |
fcb323cc | 685 | |
d21ffe7e PB |
686 | /* |
687 | * 1. used with ctx->iopoll_list with reads/writes | |
688 | * 2. to track reqs with ->files (see io_op_def::file_table) | |
689 | */ | |
010e8e6b PB |
690 | struct list_head inflight_entry; |
691 | ||
692 | struct percpu_ref *fixed_file_refs; | |
693 | struct callback_head task_work; | |
694 | /* for polled requests, i.e. IORING_OP_POLL_ADD and async armed poll */ | |
695 | struct hlist_node hash_node; | |
696 | struct async_poll *apoll; | |
697 | struct io_wq_work work; | |
2b188cc1 | 698 | }; |
05589553 | 699 | |
27dc8338 PB |
700 | struct io_defer_entry { |
701 | struct list_head list; | |
702 | struct io_kiocb *req; | |
9cf7c104 | 703 | u32 seq; |
2b188cc1 JA |
704 | }; |
705 | ||
def596e9 | 706 | #define IO_IOPOLL_BATCH 8 |
2b188cc1 | 707 | |
013538bd JA |
708 | struct io_comp_state { |
709 | unsigned int nr; | |
710 | struct list_head list; | |
711 | struct io_ring_ctx *ctx; | |
712 | }; | |
713 | ||
9a56a232 JA |
714 | struct io_submit_state { |
715 | struct blk_plug plug; | |
716 | ||
2579f913 JA |
717 | /* |
718 | * io_kiocb alloc cache | |
719 | */ | |
720 | void *reqs[IO_IOPOLL_BATCH]; | |
6c8a3134 | 721 | unsigned int free_reqs; |
2579f913 | 722 | |
013538bd JA |
723 | /* |
724 | * Batch completion logic | |
725 | */ | |
726 | struct io_comp_state comp; | |
727 | ||
9a56a232 JA |
728 | /* |
729 | * File reference cache | |
730 | */ | |
731 | struct file *file; | |
732 | unsigned int fd; | |
733 | unsigned int has_refs; | |
9a56a232 JA |
734 | unsigned int ios_left; |
735 | }; | |
736 | ||
d3656344 | 737 | struct io_op_def { |
d3656344 JA |
738 | /* needs req->file assigned */ |
739 | unsigned needs_file : 1; | |
fd2206e4 JA |
740 | /* don't fail if file grab fails */ |
741 | unsigned needs_file_no_error : 1; | |
d3656344 JA |
742 | /* hash wq insertion if file is a regular file */ |
743 | unsigned hash_reg_file : 1; | |
744 | /* unbound wq insertion if file is a non-regular file */ | |
745 | unsigned unbound_nonreg_file : 1; | |
66f4af93 JA |
746 | /* opcode is not supported by this kernel */ |
747 | unsigned not_supported : 1; | |
8a72758c JA |
748 | /* set if opcode supports polled "wait" */ |
749 | unsigned pollin : 1; | |
750 | unsigned pollout : 1; | |
bcda7baa JA |
751 | /* op supports buffer selection */ |
752 | unsigned buffer_select : 1; | |
e8c2bc1f | 753 | /* needs rlimit(RLIMIT_FSIZE) assigned */ |
57f1a649 | 754 | unsigned needs_fsize : 1; |
e8c2bc1f JA |
755 | /* must always have async data allocated */ |
756 | unsigned needs_async_data : 1; | |
757 | /* size of async data needed, if any */ | |
758 | unsigned short async_size; | |
0f203765 | 759 | unsigned work_flags; |
d3656344 JA |
760 | }; |
761 | ||
0918682b | 762 | static const struct io_op_def io_op_defs[] = { |
0463b6c5 PB |
763 | [IORING_OP_NOP] = {}, |
764 | [IORING_OP_READV] = { | |
d3656344 JA |
765 | .needs_file = 1, |
766 | .unbound_nonreg_file = 1, | |
8a72758c | 767 | .pollin = 1, |
4d954c25 | 768 | .buffer_select = 1, |
e8c2bc1f JA |
769 | .needs_async_data = 1, |
770 | .async_size = sizeof(struct io_async_rw), | |
0f203765 | 771 | .work_flags = IO_WQ_WORK_MM | IO_WQ_WORK_BLKCG, |
d3656344 | 772 | }, |
0463b6c5 | 773 | [IORING_OP_WRITEV] = { |
d3656344 JA |
774 | .needs_file = 1, |
775 | .hash_reg_file = 1, | |
776 | .unbound_nonreg_file = 1, | |
8a72758c | 777 | .pollout = 1, |
57f1a649 | 778 | .needs_fsize = 1, |
e8c2bc1f JA |
779 | .needs_async_data = 1, |
780 | .async_size = sizeof(struct io_async_rw), | |
0f203765 | 781 | .work_flags = IO_WQ_WORK_MM | IO_WQ_WORK_BLKCG, |
d3656344 | 782 | }, |
0463b6c5 | 783 | [IORING_OP_FSYNC] = { |
d3656344 | 784 | .needs_file = 1, |
0f203765 | 785 | .work_flags = IO_WQ_WORK_BLKCG, |
d3656344 | 786 | }, |
0463b6c5 | 787 | [IORING_OP_READ_FIXED] = { |
d3656344 JA |
788 | .needs_file = 1, |
789 | .unbound_nonreg_file = 1, | |
8a72758c | 790 | .pollin = 1, |
e8c2bc1f | 791 | .async_size = sizeof(struct io_async_rw), |
0f203765 | 792 | .work_flags = IO_WQ_WORK_BLKCG, |
d3656344 | 793 | }, |
0463b6c5 | 794 | [IORING_OP_WRITE_FIXED] = { |
d3656344 JA |
795 | .needs_file = 1, |
796 | .hash_reg_file = 1, | |
797 | .unbound_nonreg_file = 1, | |
8a72758c | 798 | .pollout = 1, |
57f1a649 | 799 | .needs_fsize = 1, |
e8c2bc1f | 800 | .async_size = sizeof(struct io_async_rw), |
0f203765 | 801 | .work_flags = IO_WQ_WORK_BLKCG, |
d3656344 | 802 | }, |
0463b6c5 | 803 | [IORING_OP_POLL_ADD] = { |
d3656344 JA |
804 | .needs_file = 1, |
805 | .unbound_nonreg_file = 1, | |
806 | }, | |
0463b6c5 PB |
807 | [IORING_OP_POLL_REMOVE] = {}, |
808 | [IORING_OP_SYNC_FILE_RANGE] = { | |
d3656344 | 809 | .needs_file = 1, |
0f203765 | 810 | .work_flags = IO_WQ_WORK_BLKCG, |
d3656344 | 811 | }, |
0463b6c5 | 812 | [IORING_OP_SENDMSG] = { |
d3656344 JA |
813 | .needs_file = 1, |
814 | .unbound_nonreg_file = 1, | |
8a72758c | 815 | .pollout = 1, |
e8c2bc1f JA |
816 | .needs_async_data = 1, |
817 | .async_size = sizeof(struct io_async_msghdr), | |
0f203765 JA |
818 | .work_flags = IO_WQ_WORK_MM | IO_WQ_WORK_BLKCG | |
819 | IO_WQ_WORK_FS, | |
d3656344 | 820 | }, |
0463b6c5 | 821 | [IORING_OP_RECVMSG] = { |
d3656344 JA |
822 | .needs_file = 1, |
823 | .unbound_nonreg_file = 1, | |
8a72758c | 824 | .pollin = 1, |
52de1fe1 | 825 | .buffer_select = 1, |
e8c2bc1f JA |
826 | .needs_async_data = 1, |
827 | .async_size = sizeof(struct io_async_msghdr), | |
0f203765 JA |
828 | .work_flags = IO_WQ_WORK_MM | IO_WQ_WORK_BLKCG | |
829 | IO_WQ_WORK_FS, | |
d3656344 | 830 | }, |
0463b6c5 | 831 | [IORING_OP_TIMEOUT] = { |
e8c2bc1f JA |
832 | .needs_async_data = 1, |
833 | .async_size = sizeof(struct io_timeout_data), | |
0f203765 | 834 | .work_flags = IO_WQ_WORK_MM, |
d3656344 | 835 | }, |
0463b6c5 PB |
836 | [IORING_OP_TIMEOUT_REMOVE] = {}, |
837 | [IORING_OP_ACCEPT] = { | |
d3656344 JA |
838 | .needs_file = 1, |
839 | .unbound_nonreg_file = 1, | |
8a72758c | 840 | .pollin = 1, |
0f203765 | 841 | .work_flags = IO_WQ_WORK_MM | IO_WQ_WORK_FILES, |
d3656344 | 842 | }, |
0463b6c5 PB |
843 | [IORING_OP_ASYNC_CANCEL] = {}, |
844 | [IORING_OP_LINK_TIMEOUT] = { | |
e8c2bc1f JA |
845 | .needs_async_data = 1, |
846 | .async_size = sizeof(struct io_timeout_data), | |
0f203765 | 847 | .work_flags = IO_WQ_WORK_MM, |
d3656344 | 848 | }, |
0463b6c5 | 849 | [IORING_OP_CONNECT] = { |
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_connect), | |
0f203765 | 855 | .work_flags = IO_WQ_WORK_MM, |
d3656344 | 856 | }, |
0463b6c5 | 857 | [IORING_OP_FALLOCATE] = { |
d3656344 | 858 | .needs_file = 1, |
57f1a649 | 859 | .needs_fsize = 1, |
0f203765 | 860 | .work_flags = IO_WQ_WORK_BLKCG, |
d3656344 | 861 | }, |
0463b6c5 | 862 | [IORING_OP_OPENAT] = { |
0f203765 JA |
863 | .work_flags = IO_WQ_WORK_FILES | IO_WQ_WORK_BLKCG | |
864 | IO_WQ_WORK_FS, | |
d3656344 | 865 | }, |
0463b6c5 | 866 | [IORING_OP_CLOSE] = { |
fd2206e4 JA |
867 | .needs_file = 1, |
868 | .needs_file_no_error = 1, | |
0f203765 | 869 | .work_flags = IO_WQ_WORK_FILES | IO_WQ_WORK_BLKCG, |
d3656344 | 870 | }, |
0463b6c5 | 871 | [IORING_OP_FILES_UPDATE] = { |
0f203765 | 872 | .work_flags = IO_WQ_WORK_FILES | IO_WQ_WORK_MM, |
d3656344 | 873 | }, |
0463b6c5 | 874 | [IORING_OP_STATX] = { |
0f203765 JA |
875 | .work_flags = IO_WQ_WORK_FILES | IO_WQ_WORK_MM | |
876 | IO_WQ_WORK_FS | IO_WQ_WORK_BLKCG, | |
d3656344 | 877 | }, |
0463b6c5 | 878 | [IORING_OP_READ] = { |
3a6820f2 JA |
879 | .needs_file = 1, |
880 | .unbound_nonreg_file = 1, | |
8a72758c | 881 | .pollin = 1, |
bcda7baa | 882 | .buffer_select = 1, |
e8c2bc1f | 883 | .async_size = sizeof(struct io_async_rw), |
0f203765 | 884 | .work_flags = IO_WQ_WORK_MM | IO_WQ_WORK_BLKCG, |
3a6820f2 | 885 | }, |
0463b6c5 | 886 | [IORING_OP_WRITE] = { |
3a6820f2 JA |
887 | .needs_file = 1, |
888 | .unbound_nonreg_file = 1, | |
8a72758c | 889 | .pollout = 1, |
57f1a649 | 890 | .needs_fsize = 1, |
e8c2bc1f | 891 | .async_size = sizeof(struct io_async_rw), |
0f203765 | 892 | .work_flags = IO_WQ_WORK_MM | IO_WQ_WORK_BLKCG, |
3a6820f2 | 893 | }, |
0463b6c5 | 894 | [IORING_OP_FADVISE] = { |
4840e418 | 895 | .needs_file = 1, |
0f203765 | 896 | .work_flags = IO_WQ_WORK_BLKCG, |
4840e418 | 897 | }, |
0463b6c5 | 898 | [IORING_OP_MADVISE] = { |
0f203765 | 899 | .work_flags = IO_WQ_WORK_MM | IO_WQ_WORK_BLKCG, |
c1ca757b | 900 | }, |
0463b6c5 | 901 | [IORING_OP_SEND] = { |
fddaface JA |
902 | .needs_file = 1, |
903 | .unbound_nonreg_file = 1, | |
8a72758c | 904 | .pollout = 1, |
0f203765 | 905 | .work_flags = IO_WQ_WORK_MM | IO_WQ_WORK_BLKCG, |
fddaface | 906 | }, |
0463b6c5 | 907 | [IORING_OP_RECV] = { |
fddaface JA |
908 | .needs_file = 1, |
909 | .unbound_nonreg_file = 1, | |
8a72758c | 910 | .pollin = 1, |
bcda7baa | 911 | .buffer_select = 1, |
0f203765 | 912 | .work_flags = IO_WQ_WORK_MM | IO_WQ_WORK_BLKCG, |
fddaface | 913 | }, |
0463b6c5 | 914 | [IORING_OP_OPENAT2] = { |
0f203765 JA |
915 | .work_flags = IO_WQ_WORK_FILES | IO_WQ_WORK_FS | |
916 | IO_WQ_WORK_BLKCG, | |
cebdb986 | 917 | }, |
3e4827b0 JA |
918 | [IORING_OP_EPOLL_CTL] = { |
919 | .unbound_nonreg_file = 1, | |
0f203765 | 920 | .work_flags = IO_WQ_WORK_FILES, |
3e4827b0 | 921 | }, |
7d67af2c PB |
922 | [IORING_OP_SPLICE] = { |
923 | .needs_file = 1, | |
924 | .hash_reg_file = 1, | |
925 | .unbound_nonreg_file = 1, | |
0f203765 | 926 | .work_flags = IO_WQ_WORK_BLKCG, |
ddf0322d JA |
927 | }, |
928 | [IORING_OP_PROVIDE_BUFFERS] = {}, | |
067524e9 | 929 | [IORING_OP_REMOVE_BUFFERS] = {}, |
f2a8d5c7 PB |
930 | [IORING_OP_TEE] = { |
931 | .needs_file = 1, | |
932 | .hash_reg_file = 1, | |
933 | .unbound_nonreg_file = 1, | |
934 | }, | |
d3656344 JA |
935 | }; |
936 | ||
2e0464d4 BM |
937 | enum io_mem_account { |
938 | ACCT_LOCKED, | |
939 | ACCT_PINNED, | |
940 | }; | |
941 | ||
81b68a5c PB |
942 | static void __io_complete_rw(struct io_kiocb *req, long res, long res2, |
943 | struct io_comp_state *cs); | |
78e19bbe | 944 | static void io_cqring_fill_event(struct io_kiocb *req, long res); |
ec9c02ad | 945 | static void io_put_req(struct io_kiocb *req); |
216578e5 | 946 | static void io_put_req_deferred(struct io_kiocb *req, int nr); |
c40f6379 | 947 | static void io_double_put_req(struct io_kiocb *req); |
94ae5e77 | 948 | static struct io_kiocb *io_prep_linked_timeout(struct io_kiocb *req); |
7271ef3a | 949 | static void __io_queue_linked_timeout(struct io_kiocb *req); |
94ae5e77 | 950 | static void io_queue_linked_timeout(struct io_kiocb *req); |
05f3fb3c JA |
951 | static int __io_sqe_files_update(struct io_ring_ctx *ctx, |
952 | struct io_uring_files_update *ip, | |
953 | unsigned nr_args); | |
3ca405eb | 954 | static void __io_clean_op(struct io_kiocb *req); |
8371adf5 PB |
955 | static struct file *io_file_get(struct io_submit_state *state, |
956 | struct io_kiocb *req, int fd, bool fixed); | |
c1379e24 | 957 | static void __io_queue_sqe(struct io_kiocb *req, struct io_comp_state *cs); |
4349f30e | 958 | static void io_file_put_work(struct work_struct *work); |
de0617e4 | 959 | |
b63534c4 JA |
960 | static ssize_t io_import_iovec(int rw, struct io_kiocb *req, |
961 | struct iovec **iovec, struct iov_iter *iter, | |
962 | bool needs_lock); | |
ff6165b2 JA |
963 | static int io_setup_async_rw(struct io_kiocb *req, const struct iovec *iovec, |
964 | const struct iovec *fast_iov, | |
227c0c96 | 965 | struct iov_iter *iter, bool force); |
de0617e4 | 966 | |
2b188cc1 JA |
967 | static struct kmem_cache *req_cachep; |
968 | ||
0918682b | 969 | static const struct file_operations io_uring_fops; |
2b188cc1 JA |
970 | |
971 | struct sock *io_uring_get_socket(struct file *file) | |
972 | { | |
973 | #if defined(CONFIG_UNIX) | |
974 | if (file->f_op == &io_uring_fops) { | |
975 | struct io_ring_ctx *ctx = file->private_data; | |
976 | ||
977 | return ctx->ring_sock->sk; | |
978 | } | |
979 | #endif | |
980 | return NULL; | |
981 | } | |
982 | EXPORT_SYMBOL(io_uring_get_socket); | |
983 | ||
3ca405eb PB |
984 | static inline void io_clean_op(struct io_kiocb *req) |
985 | { | |
bb175342 PB |
986 | if (req->flags & (REQ_F_NEED_CLEANUP | REQ_F_BUFFER_SELECTED | |
987 | REQ_F_INFLIGHT)) | |
3ca405eb PB |
988 | __io_clean_op(req); |
989 | } | |
990 | ||
4349f30e | 991 | static void io_sq_thread_drop_mm(void) |
c40f6379 JA |
992 | { |
993 | struct mm_struct *mm = current->mm; | |
994 | ||
995 | if (mm) { | |
996 | kthread_unuse_mm(mm); | |
997 | mmput(mm); | |
998 | } | |
999 | } | |
1000 | ||
1001 | static int __io_sq_thread_acquire_mm(struct io_ring_ctx *ctx) | |
1002 | { | |
1003 | if (!current->mm) { | |
cbcf7214 | 1004 | if (unlikely(!(ctx->flags & IORING_SETUP_SQPOLL) || |
2aede0e4 JA |
1005 | !ctx->sqo_task->mm || |
1006 | !mmget_not_zero(ctx->sqo_task->mm))) | |
c40f6379 | 1007 | return -EFAULT; |
2aede0e4 | 1008 | kthread_use_mm(ctx->sqo_task->mm); |
c40f6379 JA |
1009 | } |
1010 | ||
1011 | return 0; | |
1012 | } | |
1013 | ||
1014 | static int io_sq_thread_acquire_mm(struct io_ring_ctx *ctx, | |
1015 | struct io_kiocb *req) | |
1016 | { | |
0f203765 | 1017 | if (!(io_op_defs[req->opcode].work_flags & IO_WQ_WORK_MM)) |
c40f6379 JA |
1018 | return 0; |
1019 | return __io_sq_thread_acquire_mm(ctx); | |
1020 | } | |
1021 | ||
91d8f519 DZ |
1022 | static void io_sq_thread_associate_blkcg(struct io_ring_ctx *ctx, |
1023 | struct cgroup_subsys_state **cur_css) | |
1024 | ||
1025 | { | |
1026 | #ifdef CONFIG_BLK_CGROUP | |
1027 | /* puts the old one when swapping */ | |
1028 | if (*cur_css != ctx->sqo_blkcg_css) { | |
1029 | kthread_associate_blkcg(ctx->sqo_blkcg_css); | |
1030 | *cur_css = ctx->sqo_blkcg_css; | |
1031 | } | |
1032 | #endif | |
1033 | } | |
1034 | ||
1035 | static void io_sq_thread_unassociate_blkcg(void) | |
1036 | { | |
1037 | #ifdef CONFIG_BLK_CGROUP | |
1038 | kthread_associate_blkcg(NULL); | |
1039 | #endif | |
1040 | } | |
1041 | ||
c40f6379 JA |
1042 | static inline void req_set_fail_links(struct io_kiocb *req) |
1043 | { | |
1044 | if ((req->flags & (REQ_F_LINK | REQ_F_HARDLINK)) == REQ_F_LINK) | |
1045 | req->flags |= REQ_F_FAIL_LINK; | |
1046 | } | |
4a38aed2 | 1047 | |
1e6fa521 JA |
1048 | /* |
1049 | * None of these are dereferenced, they are simply used to check if any of | |
1050 | * them have changed. If we're under current and check they are still the | |
1051 | * same, we're fine to grab references to them for actual out-of-line use. | |
1052 | */ | |
1053 | static void io_init_identity(struct io_identity *id) | |
1054 | { | |
1055 | id->files = current->files; | |
1056 | id->mm = current->mm; | |
1057 | #ifdef CONFIG_BLK_CGROUP | |
1058 | rcu_read_lock(); | |
1059 | id->blkcg_css = blkcg_css(); | |
1060 | rcu_read_unlock(); | |
1061 | #endif | |
1062 | id->creds = current_cred(); | |
1063 | id->nsproxy = current->nsproxy; | |
1064 | id->fs = current->fs; | |
1065 | id->fsize = rlimit(RLIMIT_FSIZE); | |
4ea33a97 JA |
1066 | #ifdef CONFIG_AUDIT |
1067 | id->loginuid = current->loginuid; | |
1068 | id->sessionid = current->sessionid; | |
1069 | #endif | |
1e6fa521 JA |
1070 | refcount_set(&id->count, 1); |
1071 | } | |
1072 | ||
ec99ca6c PB |
1073 | static inline void __io_req_init_async(struct io_kiocb *req) |
1074 | { | |
1075 | memset(&req->work, 0, sizeof(req->work)); | |
1076 | req->flags |= REQ_F_WORK_INITIALIZED; | |
1077 | } | |
1078 | ||
7cdaf587 XW |
1079 | /* |
1080 | * Note: must call io_req_init_async() for the first time you | |
1081 | * touch any members of io_wq_work. | |
1082 | */ | |
1083 | static inline void io_req_init_async(struct io_kiocb *req) | |
1084 | { | |
500a373d JA |
1085 | struct io_uring_task *tctx = current->io_uring; |
1086 | ||
7cdaf587 XW |
1087 | if (req->flags & REQ_F_WORK_INITIALIZED) |
1088 | return; | |
1089 | ||
ec99ca6c | 1090 | __io_req_init_async(req); |
500a373d JA |
1091 | |
1092 | /* Grab a ref if this isn't our static identity */ | |
1093 | req->work.identity = tctx->identity; | |
1094 | if (tctx->identity != &tctx->__identity) | |
1095 | refcount_inc(&req->work.identity->count); | |
7cdaf587 XW |
1096 | } |
1097 | ||
0cdaf760 PB |
1098 | static inline bool io_async_submit(struct io_ring_ctx *ctx) |
1099 | { | |
1100 | return ctx->flags & IORING_SETUP_SQPOLL; | |
1101 | } | |
1102 | ||
2b188cc1 JA |
1103 | static void io_ring_ctx_ref_free(struct percpu_ref *ref) |
1104 | { | |
1105 | struct io_ring_ctx *ctx = container_of(ref, struct io_ring_ctx, refs); | |
1106 | ||
0f158b4c | 1107 | complete(&ctx->ref_comp); |
2b188cc1 JA |
1108 | } |
1109 | ||
8eb7e2d0 PB |
1110 | static inline bool io_is_timeout_noseq(struct io_kiocb *req) |
1111 | { | |
1112 | return !req->timeout.off; | |
1113 | } | |
1114 | ||
2b188cc1 JA |
1115 | static struct io_ring_ctx *io_ring_ctx_alloc(struct io_uring_params *p) |
1116 | { | |
1117 | struct io_ring_ctx *ctx; | |
78076bb6 | 1118 | int hash_bits; |
2b188cc1 JA |
1119 | |
1120 | ctx = kzalloc(sizeof(*ctx), GFP_KERNEL); | |
1121 | if (!ctx) | |
1122 | return NULL; | |
1123 | ||
0ddf92e8 JA |
1124 | ctx->fallback_req = kmem_cache_alloc(req_cachep, GFP_KERNEL); |
1125 | if (!ctx->fallback_req) | |
1126 | goto err; | |
1127 | ||
78076bb6 JA |
1128 | /* |
1129 | * Use 5 bits less than the max cq entries, that should give us around | |
1130 | * 32 entries per hash list if totally full and uniformly spread. | |
1131 | */ | |
1132 | hash_bits = ilog2(p->cq_entries); | |
1133 | hash_bits -= 5; | |
1134 | if (hash_bits <= 0) | |
1135 | hash_bits = 1; | |
1136 | ctx->cancel_hash_bits = hash_bits; | |
1137 | ctx->cancel_hash = kmalloc((1U << hash_bits) * sizeof(struct hlist_head), | |
1138 | GFP_KERNEL); | |
1139 | if (!ctx->cancel_hash) | |
1140 | goto err; | |
1141 | __hash_init(ctx->cancel_hash, 1U << hash_bits); | |
1142 | ||
21482896 | 1143 | if (percpu_ref_init(&ctx->refs, io_ring_ctx_ref_free, |
206aefde JA |
1144 | PERCPU_REF_ALLOW_REINIT, GFP_KERNEL)) |
1145 | goto err; | |
2b188cc1 JA |
1146 | |
1147 | ctx->flags = p->flags; | |
90554200 | 1148 | init_waitqueue_head(&ctx->sqo_sq_wait); |
69fb2131 | 1149 | INIT_LIST_HEAD(&ctx->sqd_list); |
2b188cc1 | 1150 | init_waitqueue_head(&ctx->cq_wait); |
1d7bb1d5 | 1151 | INIT_LIST_HEAD(&ctx->cq_overflow_list); |
0f158b4c JA |
1152 | init_completion(&ctx->ref_comp); |
1153 | init_completion(&ctx->sq_thread_comp); | |
5a2e745d | 1154 | idr_init(&ctx->io_buffer_idr); |
071698e1 | 1155 | idr_init(&ctx->personality_idr); |
2b188cc1 JA |
1156 | mutex_init(&ctx->uring_lock); |
1157 | init_waitqueue_head(&ctx->wait); | |
1158 | spin_lock_init(&ctx->completion_lock); | |
540e32a0 | 1159 | INIT_LIST_HEAD(&ctx->iopoll_list); |
de0617e4 | 1160 | INIT_LIST_HEAD(&ctx->defer_list); |
5262f567 | 1161 | INIT_LIST_HEAD(&ctx->timeout_list); |
fcb323cc JA |
1162 | init_waitqueue_head(&ctx->inflight_wait); |
1163 | spin_lock_init(&ctx->inflight_lock); | |
1164 | INIT_LIST_HEAD(&ctx->inflight_list); | |
4a38aed2 JA |
1165 | INIT_DELAYED_WORK(&ctx->file_put_work, io_file_put_work); |
1166 | init_llist_head(&ctx->file_put_llist); | |
2b188cc1 | 1167 | return ctx; |
206aefde | 1168 | err: |
0ddf92e8 JA |
1169 | if (ctx->fallback_req) |
1170 | kmem_cache_free(req_cachep, ctx->fallback_req); | |
78076bb6 | 1171 | kfree(ctx->cancel_hash); |
206aefde JA |
1172 | kfree(ctx); |
1173 | return NULL; | |
2b188cc1 JA |
1174 | } |
1175 | ||
9cf7c104 | 1176 | static bool req_need_defer(struct io_kiocb *req, u32 seq) |
7adf4eaf | 1177 | { |
2bc9930e JA |
1178 | if (unlikely(req->flags & REQ_F_IO_DRAIN)) { |
1179 | struct io_ring_ctx *ctx = req->ctx; | |
a197f664 | 1180 | |
9cf7c104 | 1181 | return seq != ctx->cached_cq_tail |
2c3bac6d | 1182 | + READ_ONCE(ctx->cached_cq_overflow); |
2bc9930e | 1183 | } |
de0617e4 | 1184 | |
9d858b21 | 1185 | return false; |
de0617e4 JA |
1186 | } |
1187 | ||
de0617e4 | 1188 | static void __io_commit_cqring(struct io_ring_ctx *ctx) |
2b188cc1 | 1189 | { |
75b28aff | 1190 | struct io_rings *rings = ctx->rings; |
2b188cc1 | 1191 | |
07910158 PB |
1192 | /* order cqe stores with ring update */ |
1193 | smp_store_release(&rings->cq.tail, ctx->cached_cq_tail); | |
2b188cc1 | 1194 | |
07910158 PB |
1195 | if (wq_has_sleeper(&ctx->cq_wait)) { |
1196 | wake_up_interruptible(&ctx->cq_wait); | |
1197 | kill_fasync(&ctx->cq_fasync, SIGIO, POLL_IN); | |
2b188cc1 JA |
1198 | } |
1199 | } | |
1200 | ||
5c3462cf | 1201 | static void io_put_identity(struct io_uring_task *tctx, struct io_kiocb *req) |
1e6fa521 | 1202 | { |
500a373d | 1203 | if (req->work.identity == &tctx->__identity) |
1e6fa521 JA |
1204 | return; |
1205 | if (refcount_dec_and_test(&req->work.identity->count)) | |
1206 | kfree(req->work.identity); | |
1207 | } | |
1208 | ||
4edf20f9 | 1209 | static void io_req_clean_work(struct io_kiocb *req) |
18d9be1a | 1210 | { |
7cdaf587 | 1211 | if (!(req->flags & REQ_F_WORK_INITIALIZED)) |
4edf20f9 | 1212 | return; |
51a4cc11 JA |
1213 | |
1214 | req->flags &= ~REQ_F_WORK_INITIALIZED; | |
7cdaf587 | 1215 | |
dfead8a8 | 1216 | if (req->work.flags & IO_WQ_WORK_MM) { |
98447d65 | 1217 | mmdrop(req->work.identity->mm); |
dfead8a8 | 1218 | req->work.flags &= ~IO_WQ_WORK_MM; |
cccf0ee8 | 1219 | } |
91d8f519 | 1220 | #ifdef CONFIG_BLK_CGROUP |
dfead8a8 | 1221 | if (req->work.flags & IO_WQ_WORK_BLKCG) { |
98447d65 | 1222 | css_put(req->work.identity->blkcg_css); |
dfead8a8 JA |
1223 | req->work.flags &= ~IO_WQ_WORK_BLKCG; |
1224 | } | |
91d8f519 | 1225 | #endif |
dfead8a8 | 1226 | if (req->work.flags & IO_WQ_WORK_CREDS) { |
98447d65 | 1227 | put_cred(req->work.identity->creds); |
dfead8a8 | 1228 | req->work.flags &= ~IO_WQ_WORK_CREDS; |
cccf0ee8 | 1229 | } |
dfead8a8 | 1230 | if (req->work.flags & IO_WQ_WORK_FS) { |
98447d65 | 1231 | struct fs_struct *fs = req->work.identity->fs; |
ff002b30 | 1232 | |
98447d65 | 1233 | spin_lock(&req->work.identity->fs->lock); |
ff002b30 JA |
1234 | if (--fs->users) |
1235 | fs = NULL; | |
98447d65 | 1236 | spin_unlock(&req->work.identity->fs->lock); |
ff002b30 JA |
1237 | if (fs) |
1238 | free_fs_struct(fs); | |
dfead8a8 | 1239 | req->work.flags &= ~IO_WQ_WORK_FS; |
ff002b30 | 1240 | } |
1e6fa521 | 1241 | |
5c3462cf | 1242 | io_put_identity(req->task->io_uring, req); |
561fb04a JA |
1243 | } |
1244 | ||
1e6fa521 JA |
1245 | /* |
1246 | * Create a private copy of io_identity, since some fields don't match | |
1247 | * the current context. | |
1248 | */ | |
1249 | static bool io_identity_cow(struct io_kiocb *req) | |
1250 | { | |
5c3462cf | 1251 | struct io_uring_task *tctx = current->io_uring; |
1e6fa521 JA |
1252 | const struct cred *creds = NULL; |
1253 | struct io_identity *id; | |
1254 | ||
1255 | if (req->work.flags & IO_WQ_WORK_CREDS) | |
1256 | creds = req->work.identity->creds; | |
1257 | ||
1258 | id = kmemdup(req->work.identity, sizeof(*id), GFP_KERNEL); | |
1259 | if (unlikely(!id)) { | |
1260 | req->work.flags |= IO_WQ_WORK_CANCEL; | |
1261 | return false; | |
1262 | } | |
1263 | ||
1264 | /* | |
1265 | * We can safely just re-init the creds we copied Either the field | |
1266 | * matches the current one, or we haven't grabbed it yet. The only | |
1267 | * exception is ->creds, through registered personalities, so handle | |
1268 | * that one separately. | |
1269 | */ | |
1270 | io_init_identity(id); | |
1271 | if (creds) | |
1272 | req->work.identity->creds = creds; | |
1273 | ||
1274 | /* add one for this request */ | |
1275 | refcount_inc(&id->count); | |
1276 | ||
1277 | /* drop old identity, assign new one. one ref for req, one for tctx */ | |
500a373d | 1278 | if (req->work.identity != tctx->identity && |
1e6fa521 JA |
1279 | refcount_sub_and_test(2, &req->work.identity->count)) |
1280 | kfree(req->work.identity); | |
1281 | ||
1282 | req->work.identity = id; | |
500a373d | 1283 | tctx->identity = id; |
1e6fa521 JA |
1284 | return true; |
1285 | } | |
1286 | ||
1287 | static bool io_grab_identity(struct io_kiocb *req) | |
18d9be1a | 1288 | { |
d3656344 | 1289 | const struct io_op_def *def = &io_op_defs[req->opcode]; |
5c3462cf | 1290 | struct io_identity *id = req->work.identity; |
23329513 | 1291 | struct io_ring_ctx *ctx = req->ctx; |
54a91f3b | 1292 | |
1e6fa521 JA |
1293 | if (def->needs_fsize && id->fsize != rlimit(RLIMIT_FSIZE)) |
1294 | return false; | |
16d59803 | 1295 | |
dfead8a8 | 1296 | if (!(req->work.flags & IO_WQ_WORK_FILES) && |
1e6fa521 | 1297 | (def->work_flags & IO_WQ_WORK_FILES) && |
23329513 | 1298 | !(req->flags & REQ_F_NO_FILE_TABLE)) { |
1e6fa521 JA |
1299 | if (id->files != current->files || |
1300 | id->nsproxy != current->nsproxy) | |
1301 | return false; | |
1302 | atomic_inc(&id->files->count); | |
1303 | get_nsproxy(id->nsproxy); | |
23329513 PB |
1304 | req->flags |= REQ_F_INFLIGHT; |
1305 | ||
1306 | spin_lock_irq(&ctx->inflight_lock); | |
1307 | list_add(&req->inflight_entry, &ctx->inflight_list); | |
1308 | spin_unlock_irq(&ctx->inflight_lock); | |
dfead8a8 | 1309 | req->work.flags |= IO_WQ_WORK_FILES; |
23329513 | 1310 | } |
91d8f519 | 1311 | #ifdef CONFIG_BLK_CGROUP |
dfead8a8 JA |
1312 | if (!(req->work.flags & IO_WQ_WORK_BLKCG) && |
1313 | (def->work_flags & IO_WQ_WORK_BLKCG)) { | |
91d8f519 | 1314 | rcu_read_lock(); |
1e6fa521 JA |
1315 | if (id->blkcg_css != blkcg_css()) { |
1316 | rcu_read_unlock(); | |
1317 | return false; | |
1318 | } | |
91d8f519 DZ |
1319 | /* |
1320 | * This should be rare, either the cgroup is dying or the task | |
1321 | * is moving cgroups. Just punt to root for the handful of ios. | |
1322 | */ | |
1e6fa521 | 1323 | if (css_tryget_online(id->blkcg_css)) |
dfead8a8 | 1324 | req->work.flags |= IO_WQ_WORK_BLKCG; |
91d8f519 DZ |
1325 | rcu_read_unlock(); |
1326 | } | |
1327 | #endif | |
dfead8a8 | 1328 | if (!(req->work.flags & IO_WQ_WORK_CREDS)) { |
1e6fa521 JA |
1329 | if (id->creds != current_cred()) |
1330 | return false; | |
1331 | get_cred(id->creds); | |
dfead8a8 JA |
1332 | req->work.flags |= IO_WQ_WORK_CREDS; |
1333 | } | |
4ea33a97 JA |
1334 | #ifdef CONFIG_AUDIT |
1335 | if (!uid_eq(current->loginuid, id->loginuid) || | |
1336 | current->sessionid != id->sessionid) | |
1337 | return false; | |
1338 | #endif | |
dfead8a8 JA |
1339 | if (!(req->work.flags & IO_WQ_WORK_FS) && |
1340 | (def->work_flags & IO_WQ_WORK_FS)) { | |
1e6fa521 JA |
1341 | if (current->fs != id->fs) |
1342 | return false; | |
1343 | spin_lock(&id->fs->lock); | |
1344 | if (!id->fs->in_exec) { | |
1345 | id->fs->users++; | |
dfead8a8 | 1346 | req->work.flags |= IO_WQ_WORK_FS; |
dca9cf8b PB |
1347 | } else { |
1348 | req->work.flags |= IO_WQ_WORK_CANCEL; | |
1349 | } | |
1350 | spin_unlock(¤t->fs->lock); | |
1351 | } | |
1e6fa521 JA |
1352 | |
1353 | return true; | |
1354 | } | |
1355 | ||
1356 | static void io_prep_async_work(struct io_kiocb *req) | |
1357 | { | |
1358 | const struct io_op_def *def = &io_op_defs[req->opcode]; | |
1e6fa521 | 1359 | struct io_ring_ctx *ctx = req->ctx; |
5c3462cf | 1360 | struct io_identity *id; |
1e6fa521 JA |
1361 | |
1362 | io_req_init_async(req); | |
5c3462cf | 1363 | id = req->work.identity; |
1e6fa521 JA |
1364 | |
1365 | if (req->flags & REQ_F_ISREG) { | |
1366 | if (def->hash_reg_file || (ctx->flags & IORING_SETUP_IOPOLL)) | |
1367 | io_wq_hash_work(&req->work, file_inode(req->file)); | |
1368 | } else { | |
1369 | if (def->unbound_nonreg_file) | |
1370 | req->work.flags |= IO_WQ_WORK_UNBOUND; | |
1371 | } | |
1372 | ||
1373 | /* ->mm can never change on us */ | |
1374 | if (!(req->work.flags & IO_WQ_WORK_MM) && | |
1375 | (def->work_flags & IO_WQ_WORK_MM)) { | |
1376 | mmgrab(id->mm); | |
1377 | req->work.flags |= IO_WQ_WORK_MM; | |
1378 | } | |
1379 | ||
1380 | /* if we fail grabbing identity, we must COW, regrab, and retry */ | |
1381 | if (io_grab_identity(req)) | |
1382 | return; | |
1383 | ||
1384 | if (!io_identity_cow(req)) | |
1385 | return; | |
1386 | ||
1387 | /* can't fail at this point */ | |
1388 | if (!io_grab_identity(req)) | |
1389 | WARN_ON(1); | |
561fb04a | 1390 | } |
cccf0ee8 | 1391 | |
cbdcb435 | 1392 | static void io_prep_async_link(struct io_kiocb *req) |
561fb04a | 1393 | { |
cbdcb435 | 1394 | struct io_kiocb *cur; |
54a91f3b | 1395 | |
cbdcb435 PB |
1396 | io_prep_async_work(req); |
1397 | if (req->flags & REQ_F_LINK_HEAD) | |
1398 | list_for_each_entry(cur, &req->link_list, link_list) | |
1399 | io_prep_async_work(cur); | |
561fb04a JA |
1400 | } |
1401 | ||
7271ef3a | 1402 | static struct io_kiocb *__io_queue_async_work(struct io_kiocb *req) |
561fb04a | 1403 | { |
a197f664 | 1404 | struct io_ring_ctx *ctx = req->ctx; |
cbdcb435 | 1405 | struct io_kiocb *link = io_prep_linked_timeout(req); |
561fb04a | 1406 | |
8766dd51 PB |
1407 | trace_io_uring_queue_async_work(ctx, io_wq_is_hashed(&req->work), req, |
1408 | &req->work, req->flags); | |
1409 | io_wq_enqueue(ctx->io_wq, &req->work); | |
7271ef3a | 1410 | return link; |
18d9be1a JA |
1411 | } |
1412 | ||
cbdcb435 PB |
1413 | static void io_queue_async_work(struct io_kiocb *req) |
1414 | { | |
7271ef3a JA |
1415 | struct io_kiocb *link; |
1416 | ||
cbdcb435 PB |
1417 | /* init ->work of the whole link before punting */ |
1418 | io_prep_async_link(req); | |
7271ef3a JA |
1419 | link = __io_queue_async_work(req); |
1420 | ||
1421 | if (link) | |
1422 | io_queue_linked_timeout(link); | |
cbdcb435 PB |
1423 | } |
1424 | ||
5262f567 JA |
1425 | static void io_kill_timeout(struct io_kiocb *req) |
1426 | { | |
e8c2bc1f | 1427 | struct io_timeout_data *io = req->async_data; |
5262f567 JA |
1428 | int ret; |
1429 | ||
e8c2bc1f | 1430 | ret = hrtimer_try_to_cancel(&io->timer); |
5262f567 | 1431 | if (ret != -1) { |
01cec8c1 PB |
1432 | atomic_set(&req->ctx->cq_timeouts, |
1433 | atomic_read(&req->ctx->cq_timeouts) + 1); | |
135fcde8 | 1434 | list_del_init(&req->timeout.list); |
78e19bbe | 1435 | io_cqring_fill_event(req, 0); |
216578e5 | 1436 | io_put_req_deferred(req, 1); |
5262f567 JA |
1437 | } |
1438 | } | |
1439 | ||
f3606e3a JA |
1440 | static bool io_task_match(struct io_kiocb *req, struct task_struct *tsk) |
1441 | { | |
1442 | struct io_ring_ctx *ctx = req->ctx; | |
1443 | ||
1444 | if (!tsk || req->task == tsk) | |
1445 | return true; | |
534ca6d6 JA |
1446 | if (ctx->flags & IORING_SETUP_SQPOLL) { |
1447 | if (ctx->sq_data && req->task == ctx->sq_data->thread) | |
1448 | return true; | |
1449 | } | |
f3606e3a JA |
1450 | return false; |
1451 | } | |
1452 | ||
76e1b642 JA |
1453 | /* |
1454 | * Returns true if we found and killed one or more timeouts | |
1455 | */ | |
1456 | static bool io_kill_timeouts(struct io_ring_ctx *ctx, struct task_struct *tsk) | |
5262f567 JA |
1457 | { |
1458 | struct io_kiocb *req, *tmp; | |
76e1b642 | 1459 | int canceled = 0; |
5262f567 JA |
1460 | |
1461 | spin_lock_irq(&ctx->completion_lock); | |
f3606e3a | 1462 | list_for_each_entry_safe(req, tmp, &ctx->timeout_list, timeout.list) { |
76e1b642 | 1463 | if (io_task_match(req, tsk)) { |
f3606e3a | 1464 | io_kill_timeout(req); |
76e1b642 JA |
1465 | canceled++; |
1466 | } | |
f3606e3a | 1467 | } |
5262f567 | 1468 | spin_unlock_irq(&ctx->completion_lock); |
76e1b642 | 1469 | return canceled != 0; |
5262f567 JA |
1470 | } |
1471 | ||
04518945 | 1472 | static void __io_queue_deferred(struct io_ring_ctx *ctx) |
de0617e4 | 1473 | { |
04518945 | 1474 | do { |
27dc8338 PB |
1475 | struct io_defer_entry *de = list_first_entry(&ctx->defer_list, |
1476 | struct io_defer_entry, list); | |
7271ef3a | 1477 | struct io_kiocb *link; |
de0617e4 | 1478 | |
9cf7c104 | 1479 | if (req_need_defer(de->req, de->seq)) |
04518945 | 1480 | break; |
27dc8338 | 1481 | list_del_init(&de->list); |
cbdcb435 | 1482 | /* punt-init is done before queueing for defer */ |
7271ef3a JA |
1483 | link = __io_queue_async_work(de->req); |
1484 | if (link) { | |
1485 | __io_queue_linked_timeout(link); | |
1486 | /* drop submission reference */ | |
216578e5 | 1487 | io_put_req_deferred(link, 1); |
7271ef3a | 1488 | } |
27dc8338 | 1489 | kfree(de); |
04518945 PB |
1490 | } while (!list_empty(&ctx->defer_list)); |
1491 | } | |
1492 | ||
360428f8 | 1493 | static void io_flush_timeouts(struct io_ring_ctx *ctx) |
de0617e4 | 1494 | { |
360428f8 PB |
1495 | while (!list_empty(&ctx->timeout_list)) { |
1496 | struct io_kiocb *req = list_first_entry(&ctx->timeout_list, | |
135fcde8 | 1497 | struct io_kiocb, timeout.list); |
de0617e4 | 1498 | |
8eb7e2d0 | 1499 | if (io_is_timeout_noseq(req)) |
360428f8 | 1500 | break; |
bfe68a22 PB |
1501 | if (req->timeout.target_seq != ctx->cached_cq_tail |
1502 | - atomic_read(&ctx->cq_timeouts)) | |
360428f8 | 1503 | break; |
bfe68a22 | 1504 | |
135fcde8 | 1505 | list_del_init(&req->timeout.list); |
5262f567 | 1506 | io_kill_timeout(req); |
360428f8 PB |
1507 | } |
1508 | } | |
5262f567 | 1509 | |
360428f8 PB |
1510 | static void io_commit_cqring(struct io_ring_ctx *ctx) |
1511 | { | |
1512 | io_flush_timeouts(ctx); | |
de0617e4 JA |
1513 | __io_commit_cqring(ctx); |
1514 | ||
04518945 PB |
1515 | if (unlikely(!list_empty(&ctx->defer_list))) |
1516 | __io_queue_deferred(ctx); | |
de0617e4 JA |
1517 | } |
1518 | ||
90554200 JA |
1519 | static inline bool io_sqring_full(struct io_ring_ctx *ctx) |
1520 | { | |
1521 | struct io_rings *r = ctx->rings; | |
1522 | ||
1523 | return READ_ONCE(r->sq.tail) - ctx->cached_sq_head == r->sq_ring_entries; | |
1524 | } | |
1525 | ||
2b188cc1 JA |
1526 | static struct io_uring_cqe *io_get_cqring(struct io_ring_ctx *ctx) |
1527 | { | |
75b28aff | 1528 | struct io_rings *rings = ctx->rings; |
2b188cc1 JA |
1529 | unsigned tail; |
1530 | ||
1531 | tail = ctx->cached_cq_tail; | |
115e12e5 SB |
1532 | /* |
1533 | * writes to the cq entry need to come after reading head; the | |
1534 | * control dependency is enough as we're using WRITE_ONCE to | |
1535 | * fill the cq entry | |
1536 | */ | |
75b28aff | 1537 | if (tail - READ_ONCE(rings->cq.head) == rings->cq_ring_entries) |
2b188cc1 JA |
1538 | return NULL; |
1539 | ||
1540 | ctx->cached_cq_tail++; | |
75b28aff | 1541 | return &rings->cqes[tail & ctx->cq_mask]; |
2b188cc1 JA |
1542 | } |
1543 | ||
f2842ab5 JA |
1544 | static inline bool io_should_trigger_evfd(struct io_ring_ctx *ctx) |
1545 | { | |
f0b493e6 JA |
1546 | if (!ctx->cq_ev_fd) |
1547 | return false; | |
7e55a19c SG |
1548 | if (READ_ONCE(ctx->rings->cq_flags) & IORING_CQ_EVENTFD_DISABLED) |
1549 | return false; | |
f2842ab5 JA |
1550 | if (!ctx->eventfd_async) |
1551 | return true; | |
b41e9852 | 1552 | return io_wq_current_is_worker(); |
f2842ab5 JA |
1553 | } |
1554 | ||
b41e9852 | 1555 | static void io_cqring_ev_posted(struct io_ring_ctx *ctx) |
1d7bb1d5 JA |
1556 | { |
1557 | if (waitqueue_active(&ctx->wait)) | |
1558 | wake_up(&ctx->wait); | |
534ca6d6 JA |
1559 | if (ctx->sq_data && waitqueue_active(&ctx->sq_data->wait)) |
1560 | wake_up(&ctx->sq_data->wait); | |
b41e9852 | 1561 | if (io_should_trigger_evfd(ctx)) |
1d7bb1d5 JA |
1562 | eventfd_signal(ctx->cq_ev_fd, 1); |
1563 | } | |
1564 | ||
46930143 PB |
1565 | static void io_cqring_mark_overflow(struct io_ring_ctx *ctx) |
1566 | { | |
1567 | if (list_empty(&ctx->cq_overflow_list)) { | |
1568 | clear_bit(0, &ctx->sq_check_overflow); | |
1569 | clear_bit(0, &ctx->cq_check_overflow); | |
1570 | ctx->rings->sq_flags &= ~IORING_SQ_CQ_OVERFLOW; | |
1571 | } | |
1572 | } | |
1573 | ||
e6c8aa9a JA |
1574 | static inline bool io_match_files(struct io_kiocb *req, |
1575 | struct files_struct *files) | |
1576 | { | |
1577 | if (!files) | |
1578 | return true; | |
dfead8a8 JA |
1579 | if ((req->flags & REQ_F_WORK_INITIALIZED) && |
1580 | (req->work.flags & IO_WQ_WORK_FILES)) | |
98447d65 | 1581 | return req->work.identity->files == files; |
e6c8aa9a JA |
1582 | return false; |
1583 | } | |
1584 | ||
c4a2ed72 | 1585 | /* Returns true if there are no backlogged entries after the flush */ |
e6c8aa9a JA |
1586 | static bool io_cqring_overflow_flush(struct io_ring_ctx *ctx, bool force, |
1587 | struct task_struct *tsk, | |
1588 | struct files_struct *files) | |
1d7bb1d5 JA |
1589 | { |
1590 | struct io_rings *rings = ctx->rings; | |
e6c8aa9a | 1591 | struct io_kiocb *req, *tmp; |
1d7bb1d5 | 1592 | struct io_uring_cqe *cqe; |
1d7bb1d5 JA |
1593 | unsigned long flags; |
1594 | LIST_HEAD(list); | |
1595 | ||
1596 | if (!force) { | |
1597 | if (list_empty_careful(&ctx->cq_overflow_list)) | |
c4a2ed72 | 1598 | return true; |
1d7bb1d5 JA |
1599 | if ((ctx->cached_cq_tail - READ_ONCE(rings->cq.head) == |
1600 | rings->cq_ring_entries)) | |
c4a2ed72 | 1601 | return false; |
1d7bb1d5 JA |
1602 | } |
1603 | ||
1604 | spin_lock_irqsave(&ctx->completion_lock, flags); | |
1605 | ||
1606 | /* if force is set, the ring is going away. always drop after that */ | |
1607 | if (force) | |
69b3e546 | 1608 | ctx->cq_overflow_flushed = 1; |
1d7bb1d5 | 1609 | |
c4a2ed72 | 1610 | cqe = NULL; |
e6c8aa9a JA |
1611 | list_for_each_entry_safe(req, tmp, &ctx->cq_overflow_list, compl.list) { |
1612 | if (tsk && req->task != tsk) | |
1613 | continue; | |
1614 | if (!io_match_files(req, files)) | |
1615 | continue; | |
1616 | ||
1d7bb1d5 JA |
1617 | cqe = io_get_cqring(ctx); |
1618 | if (!cqe && !force) | |
1619 | break; | |
1620 | ||
40d8ddd4 | 1621 | list_move(&req->compl.list, &list); |
1d7bb1d5 JA |
1622 | if (cqe) { |
1623 | WRITE_ONCE(cqe->user_data, req->user_data); | |
1624 | WRITE_ONCE(cqe->res, req->result); | |
0f7e466b | 1625 | WRITE_ONCE(cqe->flags, req->compl.cflags); |
1d7bb1d5 | 1626 | } else { |
2c3bac6d | 1627 | ctx->cached_cq_overflow++; |
1d7bb1d5 | 1628 | WRITE_ONCE(ctx->rings->cq_overflow, |
2c3bac6d | 1629 | ctx->cached_cq_overflow); |
1d7bb1d5 JA |
1630 | } |
1631 | } | |
1632 | ||
1633 | io_commit_cqring(ctx); | |
46930143 PB |
1634 | io_cqring_mark_overflow(ctx); |
1635 | ||
1d7bb1d5 JA |
1636 | spin_unlock_irqrestore(&ctx->completion_lock, flags); |
1637 | io_cqring_ev_posted(ctx); | |
1638 | ||
1639 | while (!list_empty(&list)) { | |
40d8ddd4 PB |
1640 | req = list_first_entry(&list, struct io_kiocb, compl.list); |
1641 | list_del(&req->compl.list); | |
ec9c02ad | 1642 | io_put_req(req); |
1d7bb1d5 | 1643 | } |
c4a2ed72 JA |
1644 | |
1645 | return cqe != NULL; | |
1d7bb1d5 JA |
1646 | } |
1647 | ||
bcda7baa | 1648 | static void __io_cqring_fill_event(struct io_kiocb *req, long res, long cflags) |
2b188cc1 | 1649 | { |
78e19bbe | 1650 | struct io_ring_ctx *ctx = req->ctx; |
2b188cc1 JA |
1651 | struct io_uring_cqe *cqe; |
1652 | ||
78e19bbe | 1653 | trace_io_uring_complete(ctx, req->user_data, res); |
51c3ff62 | 1654 | |
2b188cc1 JA |
1655 | /* |
1656 | * If we can't get a cq entry, userspace overflowed the | |
1657 | * submission (by quite a lot). Increment the overflow count in | |
1658 | * the ring. | |
1659 | */ | |
1660 | cqe = io_get_cqring(ctx); | |
1d7bb1d5 | 1661 | if (likely(cqe)) { |
78e19bbe | 1662 | WRITE_ONCE(cqe->user_data, req->user_data); |
2b188cc1 | 1663 | WRITE_ONCE(cqe->res, res); |
bcda7baa | 1664 | WRITE_ONCE(cqe->flags, cflags); |
0f212204 JA |
1665 | } else if (ctx->cq_overflow_flushed || req->task->io_uring->in_idle) { |
1666 | /* | |
1667 | * If we're in ring overflow flush mode, or in task cancel mode, | |
1668 | * then we cannot store the request for later flushing, we need | |
1669 | * to drop it on the floor. | |
1670 | */ | |
2c3bac6d PB |
1671 | ctx->cached_cq_overflow++; |
1672 | WRITE_ONCE(ctx->rings->cq_overflow, ctx->cached_cq_overflow); | |
1d7bb1d5 | 1673 | } else { |
ad3eb2c8 JA |
1674 | if (list_empty(&ctx->cq_overflow_list)) { |
1675 | set_bit(0, &ctx->sq_check_overflow); | |
1676 | set_bit(0, &ctx->cq_check_overflow); | |
6d5f9049 | 1677 | ctx->rings->sq_flags |= IORING_SQ_CQ_OVERFLOW; |
ad3eb2c8 | 1678 | } |
40d8ddd4 | 1679 | io_clean_op(req); |
1d7bb1d5 | 1680 | req->result = res; |
0f7e466b | 1681 | req->compl.cflags = cflags; |
40d8ddd4 PB |
1682 | refcount_inc(&req->refs); |
1683 | list_add_tail(&req->compl.list, &ctx->cq_overflow_list); | |
2b188cc1 JA |
1684 | } |
1685 | } | |
1686 | ||
bcda7baa JA |
1687 | static void io_cqring_fill_event(struct io_kiocb *req, long res) |
1688 | { | |
1689 | __io_cqring_fill_event(req, res, 0); | |
1690 | } | |
1691 | ||
e1e16097 | 1692 | static void io_cqring_add_event(struct io_kiocb *req, long res, long cflags) |
2b188cc1 | 1693 | { |
78e19bbe | 1694 | struct io_ring_ctx *ctx = req->ctx; |
2b188cc1 JA |
1695 | unsigned long flags; |
1696 | ||
1697 | spin_lock_irqsave(&ctx->completion_lock, flags); | |
bcda7baa | 1698 | __io_cqring_fill_event(req, res, cflags); |
2b188cc1 JA |
1699 | io_commit_cqring(ctx); |
1700 | spin_unlock_irqrestore(&ctx->completion_lock, flags); | |
1701 | ||
8c838788 | 1702 | io_cqring_ev_posted(ctx); |
2b188cc1 JA |
1703 | } |
1704 | ||
229a7b63 | 1705 | static void io_submit_flush_completions(struct io_comp_state *cs) |
bcda7baa | 1706 | { |
229a7b63 JA |
1707 | struct io_ring_ctx *ctx = cs->ctx; |
1708 | ||
1709 | spin_lock_irq(&ctx->completion_lock); | |
1710 | while (!list_empty(&cs->list)) { | |
1711 | struct io_kiocb *req; | |
1712 | ||
3ca405eb PB |
1713 | req = list_first_entry(&cs->list, struct io_kiocb, compl.list); |
1714 | list_del(&req->compl.list); | |
0f7e466b | 1715 | __io_cqring_fill_event(req, req->result, req->compl.cflags); |
216578e5 PB |
1716 | |
1717 | /* | |
1718 | * io_free_req() doesn't care about completion_lock unless one | |
1719 | * of these flags is set. REQ_F_WORK_INITIALIZED is in the list | |
1720 | * because of a potential deadlock with req->work.fs->lock | |
1721 | */ | |
1722 | if (req->flags & (REQ_F_FAIL_LINK|REQ_F_LINK_TIMEOUT | |
1723 | |REQ_F_WORK_INITIALIZED)) { | |
229a7b63 JA |
1724 | spin_unlock_irq(&ctx->completion_lock); |
1725 | io_put_req(req); | |
1726 | spin_lock_irq(&ctx->completion_lock); | |
216578e5 PB |
1727 | } else { |
1728 | io_put_req(req); | |
229a7b63 JA |
1729 | } |
1730 | } | |
1731 | io_commit_cqring(ctx); | |
1732 | spin_unlock_irq(&ctx->completion_lock); | |
1733 | ||
1734 | io_cqring_ev_posted(ctx); | |
1735 | cs->nr = 0; | |
1736 | } | |
1737 | ||
1738 | static void __io_req_complete(struct io_kiocb *req, long res, unsigned cflags, | |
1739 | struct io_comp_state *cs) | |
1740 | { | |
1741 | if (!cs) { | |
1742 | io_cqring_add_event(req, res, cflags); | |
1743 | io_put_req(req); | |
1744 | } else { | |
3ca405eb | 1745 | io_clean_op(req); |
229a7b63 | 1746 | req->result = res; |
0f7e466b | 1747 | req->compl.cflags = cflags; |
3ca405eb | 1748 | list_add_tail(&req->compl.list, &cs->list); |
229a7b63 JA |
1749 | if (++cs->nr >= 32) |
1750 | io_submit_flush_completions(cs); | |
1751 | } | |
e1e16097 JA |
1752 | } |
1753 | ||
1754 | static void io_req_complete(struct io_kiocb *req, long res) | |
bcda7baa | 1755 | { |
229a7b63 | 1756 | __io_req_complete(req, res, 0, NULL); |
bcda7baa JA |
1757 | } |
1758 | ||
0ddf92e8 JA |
1759 | static inline bool io_is_fallback_req(struct io_kiocb *req) |
1760 | { | |
1761 | return req == (struct io_kiocb *) | |
1762 | ((unsigned long) req->ctx->fallback_req & ~1UL); | |
1763 | } | |
1764 | ||
1765 | static struct io_kiocb *io_get_fallback_req(struct io_ring_ctx *ctx) | |
1766 | { | |
1767 | struct io_kiocb *req; | |
1768 | ||
1769 | req = ctx->fallback_req; | |
dd461af6 | 1770 | if (!test_and_set_bit_lock(0, (unsigned long *) &ctx->fallback_req)) |
0ddf92e8 JA |
1771 | return req; |
1772 | ||
1773 | return NULL; | |
1774 | } | |
1775 | ||
0553b8bd PB |
1776 | static struct io_kiocb *io_alloc_req(struct io_ring_ctx *ctx, |
1777 | struct io_submit_state *state) | |
2b188cc1 | 1778 | { |
f6b6c7d6 | 1779 | if (!state->free_reqs) { |
291b2821 | 1780 | gfp_t gfp = GFP_KERNEL | __GFP_NOWARN; |
2579f913 JA |
1781 | size_t sz; |
1782 | int ret; | |
1783 | ||
1784 | sz = min_t(size_t, state->ios_left, ARRAY_SIZE(state->reqs)); | |
fd6fab2c JA |
1785 | ret = kmem_cache_alloc_bulk(req_cachep, gfp, sz, state->reqs); |
1786 | ||
1787 | /* | |
1788 | * Bulk alloc is all-or-nothing. If we fail to get a batch, | |
1789 | * retry single alloc to be on the safe side. | |
1790 | */ | |
1791 | if (unlikely(ret <= 0)) { | |
1792 | state->reqs[0] = kmem_cache_alloc(req_cachep, gfp); | |
1793 | if (!state->reqs[0]) | |
0ddf92e8 | 1794 | goto fallback; |
fd6fab2c JA |
1795 | ret = 1; |
1796 | } | |
291b2821 | 1797 | state->free_reqs = ret; |
2b188cc1 JA |
1798 | } |
1799 | ||
291b2821 PB |
1800 | state->free_reqs--; |
1801 | return state->reqs[state->free_reqs]; | |
0ddf92e8 | 1802 | fallback: |
0553b8bd | 1803 | return io_get_fallback_req(ctx); |
2b188cc1 JA |
1804 | } |
1805 | ||
8da11c19 PB |
1806 | static inline void io_put_file(struct io_kiocb *req, struct file *file, |
1807 | bool fixed) | |
1808 | { | |
1809 | if (fixed) | |
05589553 | 1810 | percpu_ref_put(req->fixed_file_refs); |
8da11c19 PB |
1811 | else |
1812 | fput(file); | |
1813 | } | |
1814 | ||
4edf20f9 | 1815 | static void io_dismantle_req(struct io_kiocb *req) |
2b188cc1 | 1816 | { |
3ca405eb | 1817 | io_clean_op(req); |
929a3af9 | 1818 | |
e8c2bc1f JA |
1819 | if (req->async_data) |
1820 | kfree(req->async_data); | |
8da11c19 PB |
1821 | if (req->file) |
1822 | io_put_file(req, req->file, (req->flags & REQ_F_FIXED_FILE)); | |
fcb323cc | 1823 | |
4edf20f9 | 1824 | io_req_clean_work(req); |
e65ef56d JA |
1825 | } |
1826 | ||
216578e5 | 1827 | static void __io_free_req(struct io_kiocb *req) |
c6ca97b3 | 1828 | { |
1e6fa521 JA |
1829 | struct io_uring_task *tctx = req->task->io_uring; |
1830 | struct io_ring_ctx *ctx = req->ctx; | |
216578e5 PB |
1831 | |
1832 | io_dismantle_req(req); | |
c6ca97b3 | 1833 | |
d8a6df10 | 1834 | percpu_counter_dec(&tctx->inflight); |
0f212204 JA |
1835 | if (tctx->in_idle) |
1836 | wake_up(&tctx->wait); | |
e3bc8e9d JA |
1837 | put_task_struct(req->task); |
1838 | ||
b1e50e54 PB |
1839 | if (likely(!io_is_fallback_req(req))) |
1840 | kmem_cache_free(req_cachep, req); | |
1841 | else | |
ecfc5177 PB |
1842 | clear_bit_unlock(0, (unsigned long *) &ctx->fallback_req); |
1843 | percpu_ref_put(&ctx->refs); | |
e65ef56d JA |
1844 | } |
1845 | ||
a197f664 | 1846 | static bool io_link_cancel_timeout(struct io_kiocb *req) |
2665abfd | 1847 | { |
e8c2bc1f | 1848 | struct io_timeout_data *io = req->async_data; |
a197f664 | 1849 | struct io_ring_ctx *ctx = req->ctx; |
2665abfd JA |
1850 | int ret; |
1851 | ||
e8c2bc1f | 1852 | ret = hrtimer_try_to_cancel(&io->timer); |
2665abfd | 1853 | if (ret != -1) { |
78e19bbe | 1854 | io_cqring_fill_event(req, -ECANCELED); |
2665abfd | 1855 | io_commit_cqring(ctx); |
dea3b49c | 1856 | req->flags &= ~REQ_F_LINK_HEAD; |
216578e5 | 1857 | io_put_req_deferred(req, 1); |
2665abfd JA |
1858 | return true; |
1859 | } | |
1860 | ||
1861 | return false; | |
e65ef56d JA |
1862 | } |
1863 | ||
ab0b6451 | 1864 | static bool __io_kill_linked_timeout(struct io_kiocb *req) |
9e645e11 | 1865 | { |
7c86ffee | 1866 | struct io_kiocb *link; |
ab0b6451 | 1867 | bool wake_ev; |
7c86ffee PB |
1868 | |
1869 | if (list_empty(&req->link_list)) | |
ab0b6451 | 1870 | return false; |
7c86ffee PB |
1871 | link = list_first_entry(&req->link_list, struct io_kiocb, link_list); |
1872 | if (link->opcode != IORING_OP_LINK_TIMEOUT) | |
ab0b6451 | 1873 | return false; |
7c86ffee PB |
1874 | |
1875 | list_del_init(&link->link_list); | |
1876 | wake_ev = io_link_cancel_timeout(link); | |
1877 | req->flags &= ~REQ_F_LINK_TIMEOUT; | |
ab0b6451 JA |
1878 | return wake_ev; |
1879 | } | |
1880 | ||
1881 | static void io_kill_linked_timeout(struct io_kiocb *req) | |
9e645e11 | 1882 | { |
2665abfd | 1883 | struct io_ring_ctx *ctx = req->ctx; |
216578e5 | 1884 | unsigned long flags; |
ab0b6451 | 1885 | bool wake_ev; |
9e645e11 | 1886 | |
216578e5 PB |
1887 | spin_lock_irqsave(&ctx->completion_lock, flags); |
1888 | wake_ev = __io_kill_linked_timeout(req); | |
1889 | spin_unlock_irqrestore(&ctx->completion_lock, flags); | |
ab0b6451 | 1890 | |
7c86ffee PB |
1891 | if (wake_ev) |
1892 | io_cqring_ev_posted(ctx); | |
1893 | } | |
1894 | ||
9b5f7bd9 | 1895 | static struct io_kiocb *io_req_link_next(struct io_kiocb *req) |
7c86ffee PB |
1896 | { |
1897 | struct io_kiocb *nxt; | |
4d7dd462 | 1898 | |
9e645e11 JA |
1899 | /* |
1900 | * The list should never be empty when we are called here. But could | |
1901 | * potentially happen if the chain is messed up, check to be on the | |
1902 | * safe side. | |
1903 | */ | |
7c86ffee | 1904 | if (unlikely(list_empty(&req->link_list))) |
9b5f7bd9 | 1905 | return NULL; |
2665abfd | 1906 | |
7c86ffee PB |
1907 | nxt = list_first_entry(&req->link_list, struct io_kiocb, link_list); |
1908 | list_del_init(&req->link_list); | |
1909 | if (!list_empty(&nxt->link_list)) | |
1910 | nxt->flags |= REQ_F_LINK_HEAD; | |
9b5f7bd9 | 1911 | return nxt; |
9e645e11 JA |
1912 | } |
1913 | ||
1914 | /* | |
dea3b49c | 1915 | * Called if REQ_F_LINK_HEAD is set, and we fail the head request |
9e645e11 | 1916 | */ |
d148ca4b | 1917 | static void io_fail_links(struct io_kiocb *req) |
9e645e11 | 1918 | { |
2665abfd | 1919 | struct io_ring_ctx *ctx = req->ctx; |
d148ca4b | 1920 | unsigned long flags; |
9e645e11 | 1921 | |
d148ca4b | 1922 | spin_lock_irqsave(&ctx->completion_lock, flags); |
9e645e11 | 1923 | while (!list_empty(&req->link_list)) { |
4493233e PB |
1924 | struct io_kiocb *link = list_first_entry(&req->link_list, |
1925 | struct io_kiocb, link_list); | |
9e645e11 | 1926 | |
4493233e | 1927 | list_del_init(&link->link_list); |
c826bd7a | 1928 | trace_io_uring_fail_link(req, link); |
2665abfd | 1929 | |
7c86ffee | 1930 | io_cqring_fill_event(link, -ECANCELED); |
216578e5 PB |
1931 | |
1932 | /* | |
1933 | * It's ok to free under spinlock as they're not linked anymore, | |
1934 | * but avoid REQ_F_WORK_INITIALIZED because it may deadlock on | |
1935 | * work.fs->lock. | |
1936 | */ | |
1937 | if (link->flags & REQ_F_WORK_INITIALIZED) | |
1938 | io_put_req_deferred(link, 2); | |
1939 | else | |
1940 | io_double_put_req(link); | |
9e645e11 | 1941 | } |
2665abfd JA |
1942 | |
1943 | io_commit_cqring(ctx); | |
216578e5 | 1944 | spin_unlock_irqrestore(&ctx->completion_lock, flags); |
9e645e11 | 1945 | |
2665abfd | 1946 | io_cqring_ev_posted(ctx); |
9e645e11 JA |
1947 | } |
1948 | ||
3fa5e0f3 | 1949 | static struct io_kiocb *__io_req_find_next(struct io_kiocb *req) |
c69f8dbe | 1950 | { |
9b0d911a | 1951 | req->flags &= ~REQ_F_LINK_HEAD; |
7c86ffee PB |
1952 | if (req->flags & REQ_F_LINK_TIMEOUT) |
1953 | io_kill_linked_timeout(req); | |
944e58bf | 1954 | |
9e645e11 JA |
1955 | /* |
1956 | * If LINK is set, we have dependent requests in this chain. If we | |
1957 | * didn't fail this request, queue the first one up, moving any other | |
1958 | * dependencies to the next request. In case of failure, fail the rest | |
1959 | * of the chain. | |
1960 | */ | |
9b5f7bd9 PB |
1961 | if (likely(!(req->flags & REQ_F_FAIL_LINK))) |
1962 | return io_req_link_next(req); | |
1963 | io_fail_links(req); | |
1964 | return NULL; | |
4d7dd462 | 1965 | } |
9e645e11 | 1966 | |
3fa5e0f3 PB |
1967 | static struct io_kiocb *io_req_find_next(struct io_kiocb *req) |
1968 | { | |
1969 | if (likely(!(req->flags & REQ_F_LINK_HEAD))) | |
1970 | return NULL; | |
1971 | return __io_req_find_next(req); | |
1972 | } | |
1973 | ||
87c4311f | 1974 | static int io_req_task_work_add(struct io_kiocb *req, bool twa_signal_ok) |
c2c4c83c JA |
1975 | { |
1976 | struct task_struct *tsk = req->task; | |
1977 | struct io_ring_ctx *ctx = req->ctx; | |
0ba9c9ed | 1978 | int ret, notify; |
c2c4c83c | 1979 | |
6200b0ae JA |
1980 | if (tsk->flags & PF_EXITING) |
1981 | return -ESRCH; | |
1982 | ||
c2c4c83c | 1983 | /* |
0ba9c9ed JA |
1984 | * SQPOLL kernel thread doesn't need notification, just a wakeup. For |
1985 | * all other cases, use TWA_SIGNAL unconditionally to ensure we're | |
1986 | * processing task_work. There's no reliable way to tell if TWA_RESUME | |
1987 | * will do the job. | |
c2c4c83c | 1988 | */ |
0ba9c9ed | 1989 | notify = 0; |
fd7d6de2 | 1990 | if (!(ctx->flags & IORING_SETUP_SQPOLL) && twa_signal_ok) |
c2c4c83c JA |
1991 | notify = TWA_SIGNAL; |
1992 | ||
87c4311f | 1993 | ret = task_work_add(tsk, &req->task_work, notify); |
c2c4c83c JA |
1994 | if (!ret) |
1995 | wake_up_process(tsk); | |
0ba9c9ed | 1996 | |
c2c4c83c JA |
1997 | return ret; |
1998 | } | |
1999 | ||
c40f6379 JA |
2000 | static void __io_req_task_cancel(struct io_kiocb *req, int error) |
2001 | { | |
2002 | struct io_ring_ctx *ctx = req->ctx; | |
2003 | ||
2004 | spin_lock_irq(&ctx->completion_lock); | |
2005 | io_cqring_fill_event(req, error); | |
2006 | io_commit_cqring(ctx); | |
2007 | spin_unlock_irq(&ctx->completion_lock); | |
2008 | ||
2009 | io_cqring_ev_posted(ctx); | |
2010 | req_set_fail_links(req); | |
2011 | io_double_put_req(req); | |
2012 | } | |
2013 | ||
2014 | static void io_req_task_cancel(struct callback_head *cb) | |
2015 | { | |
2016 | struct io_kiocb *req = container_of(cb, struct io_kiocb, task_work); | |
87ceb6a6 | 2017 | struct io_ring_ctx *ctx = req->ctx; |
c40f6379 JA |
2018 | |
2019 | __io_req_task_cancel(req, -ECANCELED); | |
87ceb6a6 | 2020 | percpu_ref_put(&ctx->refs); |
c40f6379 JA |
2021 | } |
2022 | ||
2023 | static void __io_req_task_submit(struct io_kiocb *req) | |
2024 | { | |
2025 | struct io_ring_ctx *ctx = req->ctx; | |
2026 | ||
c40f6379 JA |
2027 | if (!__io_sq_thread_acquire_mm(ctx)) { |
2028 | mutex_lock(&ctx->uring_lock); | |
c1379e24 | 2029 | __io_queue_sqe(req, NULL); |
c40f6379 JA |
2030 | mutex_unlock(&ctx->uring_lock); |
2031 | } else { | |
2032 | __io_req_task_cancel(req, -EFAULT); | |
2033 | } | |
2034 | } | |
2035 | ||
2036 | static void io_req_task_submit(struct callback_head *cb) | |
2037 | { | |
2038 | struct io_kiocb *req = container_of(cb, struct io_kiocb, task_work); | |
6d816e08 | 2039 | struct io_ring_ctx *ctx = req->ctx; |
c40f6379 JA |
2040 | |
2041 | __io_req_task_submit(req); | |
6d816e08 | 2042 | percpu_ref_put(&ctx->refs); |
c40f6379 JA |
2043 | } |
2044 | ||
2045 | static void io_req_task_queue(struct io_kiocb *req) | |
2046 | { | |
c40f6379 JA |
2047 | int ret; |
2048 | ||
2049 | init_task_work(&req->task_work, io_req_task_submit); | |
6d816e08 | 2050 | percpu_ref_get(&req->ctx->refs); |
c40f6379 | 2051 | |
87c4311f | 2052 | ret = io_req_task_work_add(req, true); |
c40f6379 | 2053 | if (unlikely(ret)) { |
c2c4c83c JA |
2054 | struct task_struct *tsk; |
2055 | ||
c40f6379 JA |
2056 | init_task_work(&req->task_work, io_req_task_cancel); |
2057 | tsk = io_wq_get_task(req->ctx->io_wq); | |
c2c4c83c JA |
2058 | task_work_add(tsk, &req->task_work, 0); |
2059 | wake_up_process(tsk); | |
c40f6379 | 2060 | } |
c40f6379 JA |
2061 | } |
2062 | ||
c3524383 | 2063 | static void io_queue_next(struct io_kiocb *req) |
c69f8dbe | 2064 | { |
9b5f7bd9 | 2065 | struct io_kiocb *nxt = io_req_find_next(req); |
944e58bf PB |
2066 | |
2067 | if (nxt) | |
906a8c3f | 2068 | io_req_task_queue(nxt); |
c69f8dbe JL |
2069 | } |
2070 | ||
c3524383 | 2071 | static void io_free_req(struct io_kiocb *req) |
7a743e22 | 2072 | { |
c3524383 PB |
2073 | io_queue_next(req); |
2074 | __io_free_req(req); | |
2075 | } | |
8766dd51 | 2076 | |
2d6500d4 PB |
2077 | struct req_batch { |
2078 | void *reqs[IO_IOPOLL_BATCH]; | |
2079 | int to_free; | |
7a743e22 | 2080 | |
5af1d13e PB |
2081 | struct task_struct *task; |
2082 | int task_refs; | |
2d6500d4 PB |
2083 | }; |
2084 | ||
5af1d13e PB |
2085 | static inline void io_init_req_batch(struct req_batch *rb) |
2086 | { | |
2087 | rb->to_free = 0; | |
2088 | rb->task_refs = 0; | |
2089 | rb->task = NULL; | |
2090 | } | |
2091 | ||
2d6500d4 PB |
2092 | static void __io_req_free_batch_flush(struct io_ring_ctx *ctx, |
2093 | struct req_batch *rb) | |
2094 | { | |
2095 | kmem_cache_free_bulk(req_cachep, rb->to_free, rb->reqs); | |
2096 | percpu_ref_put_many(&ctx->refs, rb->to_free); | |
2097 | rb->to_free = 0; | |
2098 | } | |
2099 | ||
2100 | static void io_req_free_batch_finish(struct io_ring_ctx *ctx, | |
2101 | struct req_batch *rb) | |
2102 | { | |
2103 | if (rb->to_free) | |
2104 | __io_req_free_batch_flush(ctx, rb); | |
5af1d13e | 2105 | if (rb->task) { |
d8a6df10 JA |
2106 | struct io_uring_task *tctx = rb->task->io_uring; |
2107 | ||
2108 | percpu_counter_sub(&tctx->inflight, rb->task_refs); | |
5af1d13e PB |
2109 | put_task_struct_many(rb->task, rb->task_refs); |
2110 | rb->task = NULL; | |
2111 | } | |
2d6500d4 PB |
2112 | } |
2113 | ||
2114 | static void io_req_free_batch(struct req_batch *rb, struct io_kiocb *req) | |
2115 | { | |
2116 | if (unlikely(io_is_fallback_req(req))) { | |
2117 | io_free_req(req); | |
2118 | return; | |
2119 | } | |
2120 | if (req->flags & REQ_F_LINK_HEAD) | |
2121 | io_queue_next(req); | |
2122 | ||
e3bc8e9d | 2123 | if (req->task != rb->task) { |
0f212204 | 2124 | if (rb->task) { |
d8a6df10 JA |
2125 | struct io_uring_task *tctx = rb->task->io_uring; |
2126 | ||
2127 | percpu_counter_sub(&tctx->inflight, rb->task_refs); | |
e3bc8e9d | 2128 | put_task_struct_many(rb->task, rb->task_refs); |
5af1d13e | 2129 | } |
e3bc8e9d JA |
2130 | rb->task = req->task; |
2131 | rb->task_refs = 0; | |
5af1d13e | 2132 | } |
e3bc8e9d | 2133 | rb->task_refs++; |
5af1d13e | 2134 | |
4edf20f9 | 2135 | io_dismantle_req(req); |
2d6500d4 PB |
2136 | rb->reqs[rb->to_free++] = req; |
2137 | if (unlikely(rb->to_free == ARRAY_SIZE(rb->reqs))) | |
2138 | __io_req_free_batch_flush(req->ctx, rb); | |
7a743e22 PB |
2139 | } |
2140 | ||
ba816ad6 JA |
2141 | /* |
2142 | * Drop reference to request, return next in chain (if there is one) if this | |
2143 | * was the last reference to this request. | |
2144 | */ | |
9b5f7bd9 | 2145 | static struct io_kiocb *io_put_req_find_next(struct io_kiocb *req) |
e65ef56d | 2146 | { |
9b5f7bd9 PB |
2147 | struct io_kiocb *nxt = NULL; |
2148 | ||
2a44f467 | 2149 | if (refcount_dec_and_test(&req->refs)) { |
9b5f7bd9 | 2150 | nxt = io_req_find_next(req); |
4d7dd462 | 2151 | __io_free_req(req); |
2a44f467 | 2152 | } |
9b5f7bd9 | 2153 | return nxt; |
2b188cc1 JA |
2154 | } |
2155 | ||
e65ef56d JA |
2156 | static void io_put_req(struct io_kiocb *req) |
2157 | { | |
2158 | if (refcount_dec_and_test(&req->refs)) | |
2159 | io_free_req(req); | |
2b188cc1 JA |
2160 | } |
2161 | ||
216578e5 PB |
2162 | static void io_put_req_deferred_cb(struct callback_head *cb) |
2163 | { | |
2164 | struct io_kiocb *req = container_of(cb, struct io_kiocb, task_work); | |
2165 | ||
2166 | io_free_req(req); | |
2167 | } | |
2168 | ||
2169 | static void io_free_req_deferred(struct io_kiocb *req) | |
2170 | { | |
2171 | int ret; | |
2172 | ||
2173 | init_task_work(&req->task_work, io_put_req_deferred_cb); | |
2174 | ret = io_req_task_work_add(req, true); | |
2175 | if (unlikely(ret)) { | |
2176 | struct task_struct *tsk; | |
2177 | ||
2178 | tsk = io_wq_get_task(req->ctx->io_wq); | |
2179 | task_work_add(tsk, &req->task_work, 0); | |
2180 | wake_up_process(tsk); | |
2181 | } | |
2182 | } | |
2183 | ||
2184 | static inline void io_put_req_deferred(struct io_kiocb *req, int refs) | |
2185 | { | |
2186 | if (refcount_sub_and_test(refs, &req->refs)) | |
2187 | io_free_req_deferred(req); | |
2188 | } | |
2189 | ||
f4db7182 | 2190 | static struct io_wq_work *io_steal_work(struct io_kiocb *req) |
7a743e22 | 2191 | { |
6df1db6b | 2192 | struct io_kiocb *nxt; |
f4db7182 | 2193 | |
7a743e22 | 2194 | /* |
f4db7182 PB |
2195 | * A ref is owned by io-wq in which context we're. So, if that's the |
2196 | * last one, it's safe to steal next work. False negatives are Ok, | |
2197 | * it just will be re-punted async in io_put_work() | |
7a743e22 | 2198 | */ |
f4db7182 PB |
2199 | if (refcount_read(&req->refs) != 1) |
2200 | return NULL; | |
7a743e22 | 2201 | |
9b5f7bd9 | 2202 | nxt = io_req_find_next(req); |
6df1db6b | 2203 | return nxt ? &nxt->work : NULL; |
7a743e22 PB |
2204 | } |
2205 | ||
978db57e JA |
2206 | static void io_double_put_req(struct io_kiocb *req) |
2207 | { | |
2208 | /* drop both submit and complete references */ | |
2209 | if (refcount_sub_and_test(2, &req->refs)) | |
2210 | io_free_req(req); | |
2211 | } | |
2212 | ||
1d7bb1d5 | 2213 | static unsigned io_cqring_events(struct io_ring_ctx *ctx, bool noflush) |
a3a0e43f | 2214 | { |
84f97dc2 JA |
2215 | struct io_rings *rings = ctx->rings; |
2216 | ||
ad3eb2c8 JA |
2217 | if (test_bit(0, &ctx->cq_check_overflow)) { |
2218 | /* | |
2219 | * noflush == true is from the waitqueue handler, just ensure | |
2220 | * we wake up the task, and the next invocation will flush the | |
2221 | * entries. We cannot safely to it from here. | |
2222 | */ | |
2223 | if (noflush && !list_empty(&ctx->cq_overflow_list)) | |
2224 | return -1U; | |
1d7bb1d5 | 2225 | |
e6c8aa9a | 2226 | io_cqring_overflow_flush(ctx, false, NULL, NULL); |
ad3eb2c8 | 2227 | } |
1d7bb1d5 | 2228 | |
a3a0e43f JA |
2229 | /* See comment at the top of this file */ |
2230 | smp_rmb(); | |
ad3eb2c8 | 2231 | return ctx->cached_cq_tail - READ_ONCE(rings->cq.head); |
a3a0e43f JA |
2232 | } |
2233 | ||
fb5ccc98 PB |
2234 | static inline unsigned int io_sqring_entries(struct io_ring_ctx *ctx) |
2235 | { | |
2236 | struct io_rings *rings = ctx->rings; | |
2237 | ||
2238 | /* make sure SQ entry isn't read before tail */ | |
2239 | return smp_load_acquire(&rings->sq.tail) - ctx->cached_sq_head; | |
2240 | } | |
2241 | ||
8ff069bf | 2242 | static unsigned int io_put_kbuf(struct io_kiocb *req, struct io_buffer *kbuf) |
e94f141b | 2243 | { |
8ff069bf | 2244 | unsigned int cflags; |
e94f141b | 2245 | |
bcda7baa JA |
2246 | cflags = kbuf->bid << IORING_CQE_BUFFER_SHIFT; |
2247 | cflags |= IORING_CQE_F_BUFFER; | |
0e1b6fe3 | 2248 | req->flags &= ~REQ_F_BUFFER_SELECTED; |
bcda7baa JA |
2249 | kfree(kbuf); |
2250 | return cflags; | |
e94f141b JA |
2251 | } |
2252 | ||
8ff069bf | 2253 | static inline unsigned int io_put_rw_kbuf(struct io_kiocb *req) |
bcda7baa | 2254 | { |
4d954c25 | 2255 | struct io_buffer *kbuf; |
bcda7baa | 2256 | |
4d954c25 | 2257 | kbuf = (struct io_buffer *) (unsigned long) req->rw.addr; |
8ff069bf PB |
2258 | return io_put_kbuf(req, kbuf); |
2259 | } | |
2260 | ||
4c6e277c JA |
2261 | static inline bool io_run_task_work(void) |
2262 | { | |
6200b0ae JA |
2263 | /* |
2264 | * Not safe to run on exiting task, and the task_work handling will | |
2265 | * not add work to such a task. | |
2266 | */ | |
2267 | if (unlikely(current->flags & PF_EXITING)) | |
2268 | return false; | |
4c6e277c JA |
2269 | if (current->task_works) { |
2270 | __set_current_state(TASK_RUNNING); | |
2271 | task_work_run(); | |
2272 | return true; | |
2273 | } | |
2274 | ||
2275 | return false; | |
bcda7baa JA |
2276 | } |
2277 | ||
bbde017a XW |
2278 | static void io_iopoll_queue(struct list_head *again) |
2279 | { | |
2280 | struct io_kiocb *req; | |
2281 | ||
2282 | do { | |
d21ffe7e PB |
2283 | req = list_first_entry(again, struct io_kiocb, inflight_entry); |
2284 | list_del(&req->inflight_entry); | |
81b68a5c | 2285 | __io_complete_rw(req, -EAGAIN, 0, NULL); |
bbde017a XW |
2286 | } while (!list_empty(again)); |
2287 | } | |
2288 | ||
def596e9 JA |
2289 | /* |
2290 | * Find and free completed poll iocbs | |
2291 | */ | |
2292 | static void io_iopoll_complete(struct io_ring_ctx *ctx, unsigned int *nr_events, | |
2293 | struct list_head *done) | |
2294 | { | |
8237e045 | 2295 | struct req_batch rb; |
def596e9 | 2296 | struct io_kiocb *req; |
bbde017a XW |
2297 | LIST_HEAD(again); |
2298 | ||
2299 | /* order with ->result store in io_complete_rw_iopoll() */ | |
2300 | smp_rmb(); | |
def596e9 | 2301 | |
5af1d13e | 2302 | io_init_req_batch(&rb); |
def596e9 | 2303 | while (!list_empty(done)) { |
bcda7baa JA |
2304 | int cflags = 0; |
2305 | ||
d21ffe7e | 2306 | req = list_first_entry(done, struct io_kiocb, inflight_entry); |
bbde017a | 2307 | if (READ_ONCE(req->result) == -EAGAIN) { |
56450c20 | 2308 | req->result = 0; |
bbde017a | 2309 | req->iopoll_completed = 0; |
d21ffe7e | 2310 | list_move_tail(&req->inflight_entry, &again); |
bbde017a XW |
2311 | continue; |
2312 | } | |
d21ffe7e | 2313 | list_del(&req->inflight_entry); |
def596e9 | 2314 | |
bcda7baa | 2315 | if (req->flags & REQ_F_BUFFER_SELECTED) |
8ff069bf | 2316 | cflags = io_put_rw_kbuf(req); |
bcda7baa JA |
2317 | |
2318 | __io_cqring_fill_event(req, req->result, cflags); | |
def596e9 JA |
2319 | (*nr_events)++; |
2320 | ||
c3524383 | 2321 | if (refcount_dec_and_test(&req->refs)) |
2d6500d4 | 2322 | io_req_free_batch(&rb, req); |
def596e9 | 2323 | } |
def596e9 | 2324 | |
09bb8394 | 2325 | io_commit_cqring(ctx); |
32b2244a XW |
2326 | if (ctx->flags & IORING_SETUP_SQPOLL) |
2327 | io_cqring_ev_posted(ctx); | |
2d6500d4 | 2328 | io_req_free_batch_finish(ctx, &rb); |
581f9810 | 2329 | |
bbde017a XW |
2330 | if (!list_empty(&again)) |
2331 | io_iopoll_queue(&again); | |
581f9810 BM |
2332 | } |
2333 | ||
def596e9 JA |
2334 | static int io_do_iopoll(struct io_ring_ctx *ctx, unsigned int *nr_events, |
2335 | long min) | |
2336 | { | |
2337 | struct io_kiocb *req, *tmp; | |
2338 | LIST_HEAD(done); | |
2339 | bool spin; | |
2340 | int ret; | |
2341 | ||
2342 | /* | |
2343 | * Only spin for completions if we don't have multiple devices hanging | |
2344 | * off our complete list, and we're under the requested amount. | |
2345 | */ | |
2346 | spin = !ctx->poll_multi_file && *nr_events < min; | |
2347 | ||
2348 | ret = 0; | |
d21ffe7e | 2349 | list_for_each_entry_safe(req, tmp, &ctx->iopoll_list, inflight_entry) { |
9adbd45d | 2350 | struct kiocb *kiocb = &req->rw.kiocb; |
def596e9 JA |
2351 | |
2352 | /* | |
581f9810 BM |
2353 | * Move completed and retryable entries to our local lists. |
2354 | * If we find a request that requires polling, break out | |
2355 | * and complete those lists first, if we have entries there. | |
def596e9 | 2356 | */ |
65a6543d | 2357 | if (READ_ONCE(req->iopoll_completed)) { |
d21ffe7e | 2358 | list_move_tail(&req->inflight_entry, &done); |
def596e9 JA |
2359 | continue; |
2360 | } | |
2361 | if (!list_empty(&done)) | |
2362 | break; | |
2363 | ||
2364 | ret = kiocb->ki_filp->f_op->iopoll(kiocb, spin); | |
2365 | if (ret < 0) | |
2366 | break; | |
2367 | ||
3aadc23e PB |
2368 | /* iopoll may have completed current req */ |
2369 | if (READ_ONCE(req->iopoll_completed)) | |
d21ffe7e | 2370 | list_move_tail(&req->inflight_entry, &done); |
3aadc23e | 2371 | |
def596e9 JA |
2372 | if (ret && spin) |
2373 | spin = false; | |
2374 | ret = 0; | |
2375 | } | |
2376 | ||
2377 | if (!list_empty(&done)) | |
2378 | io_iopoll_complete(ctx, nr_events, &done); | |
2379 | ||
2380 | return ret; | |
2381 | } | |
2382 | ||
2383 | /* | |
d195a66e | 2384 | * Poll for a minimum of 'min' events. Note that if min == 0 we consider that a |
def596e9 JA |
2385 | * non-spinning poll check - we'll still enter the driver poll loop, but only |
2386 | * as a non-spinning completion check. | |
2387 | */ | |
2388 | static int io_iopoll_getevents(struct io_ring_ctx *ctx, unsigned int *nr_events, | |
2389 | long min) | |
2390 | { | |
540e32a0 | 2391 | while (!list_empty(&ctx->iopoll_list) && !need_resched()) { |
def596e9 JA |
2392 | int ret; |
2393 | ||
2394 | ret = io_do_iopoll(ctx, nr_events, min); | |
2395 | if (ret < 0) | |
2396 | return ret; | |
eba0a4dd | 2397 | if (*nr_events >= min) |
def596e9 JA |
2398 | return 0; |
2399 | } | |
2400 | ||
2401 | return 1; | |
2402 | } | |
2403 | ||
2404 | /* | |
2405 | * We can't just wait for polled events to come to us, we have to actively | |
2406 | * find and complete them. | |
2407 | */ | |
b2edc0a7 | 2408 | static void io_iopoll_try_reap_events(struct io_ring_ctx *ctx) |
def596e9 JA |
2409 | { |
2410 | if (!(ctx->flags & IORING_SETUP_IOPOLL)) | |
2411 | return; | |
2412 | ||
2413 | mutex_lock(&ctx->uring_lock); | |
540e32a0 | 2414 | while (!list_empty(&ctx->iopoll_list)) { |
def596e9 JA |
2415 | unsigned int nr_events = 0; |
2416 | ||
b2edc0a7 | 2417 | io_do_iopoll(ctx, &nr_events, 0); |
08f5439f | 2418 | |
b2edc0a7 PB |
2419 | /* let it sleep and repeat later if can't complete a request */ |
2420 | if (nr_events == 0) | |
2421 | break; | |
08f5439f JA |
2422 | /* |
2423 | * Ensure we allow local-to-the-cpu processing to take place, | |
2424 | * in this case we need to ensure that we reap all events. | |
3fcee5a6 | 2425 | * Also let task_work, etc. to progress by releasing the mutex |
08f5439f | 2426 | */ |
3fcee5a6 PB |
2427 | if (need_resched()) { |
2428 | mutex_unlock(&ctx->uring_lock); | |
2429 | cond_resched(); | |
2430 | mutex_lock(&ctx->uring_lock); | |
2431 | } | |
def596e9 JA |
2432 | } |
2433 | mutex_unlock(&ctx->uring_lock); | |
2434 | } | |
2435 | ||
7668b92a | 2436 | static int io_iopoll_check(struct io_ring_ctx *ctx, long min) |
def596e9 | 2437 | { |
7668b92a | 2438 | unsigned int nr_events = 0; |
2b2ed975 | 2439 | int iters = 0, ret = 0; |
500f9fba | 2440 | |
c7849be9 XW |
2441 | /* |
2442 | * We disallow the app entering submit/complete with polling, but we | |
2443 | * still need to lock the ring to prevent racing with polled issue | |
2444 | * that got punted to a workqueue. | |
2445 | */ | |
2446 | mutex_lock(&ctx->uring_lock); | |
def596e9 | 2447 | do { |
a3a0e43f JA |
2448 | /* |
2449 | * Don't enter poll loop if we already have events pending. | |
2450 | * If we do, we can potentially be spinning for commands that | |
2451 | * already triggered a CQE (eg in error). | |
2452 | */ | |
1d7bb1d5 | 2453 | if (io_cqring_events(ctx, false)) |
a3a0e43f JA |
2454 | break; |
2455 | ||
500f9fba JA |
2456 | /* |
2457 | * If a submit got punted to a workqueue, we can have the | |
2458 | * application entering polling for a command before it gets | |
2459 | * issued. That app will hold the uring_lock for the duration | |
2460 | * of the poll right here, so we need to take a breather every | |
2461 | * now and then to ensure that the issue has a chance to add | |
2462 | * the poll to the issued list. Otherwise we can spin here | |
2463 | * forever, while the workqueue is stuck trying to acquire the | |
2464 | * very same mutex. | |
2465 | */ | |
2466 | if (!(++iters & 7)) { | |
2467 | mutex_unlock(&ctx->uring_lock); | |
4c6e277c | 2468 | io_run_task_work(); |
500f9fba JA |
2469 | mutex_lock(&ctx->uring_lock); |
2470 | } | |
2471 | ||
7668b92a | 2472 | ret = io_iopoll_getevents(ctx, &nr_events, min); |
def596e9 JA |
2473 | if (ret <= 0) |
2474 | break; | |
2475 | ret = 0; | |
7668b92a | 2476 | } while (min && !nr_events && !need_resched()); |
def596e9 | 2477 | |
500f9fba | 2478 | mutex_unlock(&ctx->uring_lock); |
def596e9 JA |
2479 | return ret; |
2480 | } | |
2481 | ||
491381ce | 2482 | static void kiocb_end_write(struct io_kiocb *req) |
2b188cc1 | 2483 | { |
491381ce JA |
2484 | /* |
2485 | * Tell lockdep we inherited freeze protection from submission | |
2486 | * thread. | |
2487 | */ | |
2488 | if (req->flags & REQ_F_ISREG) { | |
2489 | struct inode *inode = file_inode(req->file); | |
2b188cc1 | 2490 | |
491381ce | 2491 | __sb_writers_acquired(inode->i_sb, SB_FREEZE_WRITE); |
2b188cc1 | 2492 | } |
491381ce | 2493 | file_end_write(req->file); |
2b188cc1 JA |
2494 | } |
2495 | ||
a1d7c393 JA |
2496 | static void io_complete_rw_common(struct kiocb *kiocb, long res, |
2497 | struct io_comp_state *cs) | |
2b188cc1 | 2498 | { |
9adbd45d | 2499 | struct io_kiocb *req = container_of(kiocb, struct io_kiocb, rw.kiocb); |
bcda7baa | 2500 | int cflags = 0; |
2b188cc1 | 2501 | |
491381ce JA |
2502 | if (kiocb->ki_flags & IOCB_WRITE) |
2503 | kiocb_end_write(req); | |
2b188cc1 | 2504 | |
4e88d6e7 JA |
2505 | if (res != req->result) |
2506 | req_set_fail_links(req); | |
bcda7baa | 2507 | if (req->flags & REQ_F_BUFFER_SELECTED) |
8ff069bf | 2508 | cflags = io_put_rw_kbuf(req); |
a1d7c393 | 2509 | __io_req_complete(req, res, cflags, cs); |
ba816ad6 JA |
2510 | } |
2511 | ||
b63534c4 JA |
2512 | #ifdef CONFIG_BLOCK |
2513 | static bool io_resubmit_prep(struct io_kiocb *req, int error) | |
2514 | { | |
2515 | struct iovec inline_vecs[UIO_FASTIOV], *iovec = inline_vecs; | |
2516 | ssize_t ret = -ECANCELED; | |
2517 | struct iov_iter iter; | |
2518 | int rw; | |
2519 | ||
2520 | if (error) { | |
2521 | ret = error; | |
2522 | goto end_req; | |
2523 | } | |
2524 | ||
2525 | switch (req->opcode) { | |
2526 | case IORING_OP_READV: | |
2527 | case IORING_OP_READ_FIXED: | |
2528 | case IORING_OP_READ: | |
2529 | rw = READ; | |
2530 | break; | |
2531 | case IORING_OP_WRITEV: | |
2532 | case IORING_OP_WRITE_FIXED: | |
2533 | case IORING_OP_WRITE: | |
2534 | rw = WRITE; | |
2535 | break; | |
2536 | default: | |
2537 | printk_once(KERN_WARNING "io_uring: bad opcode in resubmit %d\n", | |
2538 | req->opcode); | |
2539 | goto end_req; | |
2540 | } | |
2541 | ||
e8c2bc1f | 2542 | if (!req->async_data) { |
8f3d7496 JA |
2543 | ret = io_import_iovec(rw, req, &iovec, &iter, false); |
2544 | if (ret < 0) | |
2545 | goto end_req; | |
2546 | ret = io_setup_async_rw(req, iovec, inline_vecs, &iter, false); | |
2547 | if (!ret) | |
2548 | return true; | |
2549 | kfree(iovec); | |
2550 | } else { | |
b63534c4 | 2551 | return true; |
8f3d7496 | 2552 | } |
b63534c4 | 2553 | end_req: |
b63534c4 | 2554 | req_set_fail_links(req); |
e1e16097 | 2555 | io_req_complete(req, ret); |
b63534c4 JA |
2556 | return false; |
2557 | } | |
b63534c4 JA |
2558 | #endif |
2559 | ||
2560 | static bool io_rw_reissue(struct io_kiocb *req, long res) | |
2561 | { | |
2562 | #ifdef CONFIG_BLOCK | |
355afaeb | 2563 | umode_t mode = file_inode(req->file)->i_mode; |
b63534c4 JA |
2564 | int ret; |
2565 | ||
355afaeb JA |
2566 | if (!S_ISBLK(mode) && !S_ISREG(mode)) |
2567 | return false; | |
b63534c4 JA |
2568 | if ((res != -EAGAIN && res != -EOPNOTSUPP) || io_wq_current_is_worker()) |
2569 | return false; | |
2570 | ||
fdee946d | 2571 | ret = io_sq_thread_acquire_mm(req->ctx, req); |
6d816e08 | 2572 | |
fdee946d JA |
2573 | if (io_resubmit_prep(req, ret)) { |
2574 | refcount_inc(&req->refs); | |
2575 | io_queue_async_work(req); | |
b63534c4 | 2576 | return true; |
fdee946d JA |
2577 | } |
2578 | ||
b63534c4 JA |
2579 | #endif |
2580 | return false; | |
2581 | } | |
2582 | ||
a1d7c393 JA |
2583 | static void __io_complete_rw(struct io_kiocb *req, long res, long res2, |
2584 | struct io_comp_state *cs) | |
2585 | { | |
2586 | if (!io_rw_reissue(req, res)) | |
2587 | io_complete_rw_common(&req->rw.kiocb, res, cs); | |
ba816ad6 JA |
2588 | } |
2589 | ||
2590 | static void io_complete_rw(struct kiocb *kiocb, long res, long res2) | |
2591 | { | |
9adbd45d | 2592 | struct io_kiocb *req = container_of(kiocb, struct io_kiocb, rw.kiocb); |
ba816ad6 | 2593 | |
a1d7c393 | 2594 | __io_complete_rw(req, res, res2, NULL); |
2b188cc1 JA |
2595 | } |
2596 | ||
def596e9 JA |
2597 | static void io_complete_rw_iopoll(struct kiocb *kiocb, long res, long res2) |
2598 | { | |
9adbd45d | 2599 | struct io_kiocb *req = container_of(kiocb, struct io_kiocb, rw.kiocb); |
def596e9 | 2600 | |
491381ce JA |
2601 | if (kiocb->ki_flags & IOCB_WRITE) |
2602 | kiocb_end_write(req); | |
def596e9 | 2603 | |
2d7d6792 | 2604 | if (res != -EAGAIN && res != req->result) |
4e88d6e7 | 2605 | req_set_fail_links(req); |
bbde017a XW |
2606 | |
2607 | WRITE_ONCE(req->result, res); | |
2608 | /* order with io_poll_complete() checking ->result */ | |
cd664b0e PB |
2609 | smp_wmb(); |
2610 | WRITE_ONCE(req->iopoll_completed, 1); | |
def596e9 JA |
2611 | } |
2612 | ||
2613 | /* | |
2614 | * After the iocb has been issued, it's safe to be found on the poll list. | |
2615 | * Adding the kiocb to the list AFTER submission ensures that we don't | |
2616 | * find it from a io_iopoll_getevents() thread before the issuer is done | |
2617 | * accessing the kiocb cookie. | |
2618 | */ | |
2619 | static void io_iopoll_req_issued(struct io_kiocb *req) | |
2620 | { | |
2621 | struct io_ring_ctx *ctx = req->ctx; | |
2622 | ||
2623 | /* | |
2624 | * Track whether we have multiple files in our lists. This will impact | |
2625 | * how we do polling eventually, not spinning if we're on potentially | |
2626 | * different devices. | |
2627 | */ | |
540e32a0 | 2628 | if (list_empty(&ctx->iopoll_list)) { |
def596e9 JA |
2629 | ctx->poll_multi_file = false; |
2630 | } else if (!ctx->poll_multi_file) { | |
2631 | struct io_kiocb *list_req; | |
2632 | ||
540e32a0 | 2633 | list_req = list_first_entry(&ctx->iopoll_list, struct io_kiocb, |
d21ffe7e | 2634 | inflight_entry); |
9adbd45d | 2635 | if (list_req->file != req->file) |
def596e9 JA |
2636 | ctx->poll_multi_file = true; |
2637 | } | |
2638 | ||
2639 | /* | |
2640 | * For fast devices, IO may have already completed. If it has, add | |
2641 | * it to the front so we find it first. | |
2642 | */ | |
65a6543d | 2643 | if (READ_ONCE(req->iopoll_completed)) |
d21ffe7e | 2644 | list_add(&req->inflight_entry, &ctx->iopoll_list); |
def596e9 | 2645 | else |
d21ffe7e | 2646 | list_add_tail(&req->inflight_entry, &ctx->iopoll_list); |
bdcd3eab XW |
2647 | |
2648 | if ((ctx->flags & IORING_SETUP_SQPOLL) && | |
534ca6d6 JA |
2649 | wq_has_sleeper(&ctx->sq_data->wait)) |
2650 | wake_up(&ctx->sq_data->wait); | |
def596e9 JA |
2651 | } |
2652 | ||
9f13c35b | 2653 | static void __io_state_file_put(struct io_submit_state *state) |
9a56a232 | 2654 | { |
06ef3608 PB |
2655 | if (state->has_refs) |
2656 | fput_many(state->file, state->has_refs); | |
9f13c35b PB |
2657 | state->file = NULL; |
2658 | } | |
2659 | ||
2660 | static inline void io_state_file_put(struct io_submit_state *state) | |
2661 | { | |
2662 | if (state->file) | |
2663 | __io_state_file_put(state); | |
9a56a232 JA |
2664 | } |
2665 | ||
2666 | /* | |
2667 | * Get as many references to a file as we have IOs left in this submission, | |
2668 | * assuming most submissions are for one file, or at least that each file | |
2669 | * has more than one submission. | |
2670 | */ | |
8da11c19 | 2671 | static struct file *__io_file_get(struct io_submit_state *state, int fd) |
9a56a232 JA |
2672 | { |
2673 | if (!state) | |
2674 | return fget(fd); | |
2675 | ||
2676 | if (state->file) { | |
2677 | if (state->fd == fd) { | |
06ef3608 | 2678 | state->has_refs--; |
9a56a232 JA |
2679 | return state->file; |
2680 | } | |
9f13c35b | 2681 | __io_state_file_put(state); |
9a56a232 JA |
2682 | } |
2683 | state->file = fget_many(fd, state->ios_left); | |
2684 | if (!state->file) | |
2685 | return NULL; | |
2686 | ||
2687 | state->fd = fd; | |
71b547c0 | 2688 | state->has_refs = state->ios_left - 1; |
9a56a232 JA |
2689 | return state->file; |
2690 | } | |
2691 | ||
4503b767 JA |
2692 | static bool io_bdev_nowait(struct block_device *bdev) |
2693 | { | |
2694 | #ifdef CONFIG_BLOCK | |
9ba0d0c8 | 2695 | return !bdev || blk_queue_nowait(bdev_get_queue(bdev)); |
4503b767 JA |
2696 | #else |
2697 | return true; | |
2698 | #endif | |
2699 | } | |
2700 | ||
2b188cc1 JA |
2701 | /* |
2702 | * If we tracked the file through the SCM inflight mechanism, we could support | |
2703 | * any file. For now, just ensure that anything potentially problematic is done | |
2704 | * inline. | |
2705 | */ | |
af197f50 | 2706 | static bool io_file_supports_async(struct file *file, int rw) |
2b188cc1 JA |
2707 | { |
2708 | umode_t mode = file_inode(file)->i_mode; | |
2709 | ||
4503b767 JA |
2710 | if (S_ISBLK(mode)) { |
2711 | if (io_bdev_nowait(file->f_inode->i_bdev)) | |
2712 | return true; | |
2713 | return false; | |
2714 | } | |
2715 | if (S_ISCHR(mode) || S_ISSOCK(mode)) | |
2b188cc1 | 2716 | return true; |
4503b767 JA |
2717 | if (S_ISREG(mode)) { |
2718 | if (io_bdev_nowait(file->f_inode->i_sb->s_bdev) && | |
2719 | file->f_op != &io_uring_fops) | |
2720 | return true; | |
2721 | return false; | |
2722 | } | |
2b188cc1 | 2723 | |
c5b85625 JA |
2724 | /* any ->read/write should understand O_NONBLOCK */ |
2725 | if (file->f_flags & O_NONBLOCK) | |
2726 | return true; | |
2727 | ||
af197f50 JA |
2728 | if (!(file->f_mode & FMODE_NOWAIT)) |
2729 | return false; | |
2730 | ||
2731 | if (rw == READ) | |
2732 | return file->f_op->read_iter != NULL; | |
2733 | ||
2734 | return file->f_op->write_iter != NULL; | |
2b188cc1 JA |
2735 | } |
2736 | ||
a88fc400 | 2737 | static int io_prep_rw(struct io_kiocb *req, const struct io_uring_sqe *sqe) |
2b188cc1 | 2738 | { |
def596e9 | 2739 | struct io_ring_ctx *ctx = req->ctx; |
9adbd45d | 2740 | struct kiocb *kiocb = &req->rw.kiocb; |
09bb8394 JA |
2741 | unsigned ioprio; |
2742 | int ret; | |
2b188cc1 | 2743 | |
491381ce JA |
2744 | if (S_ISREG(file_inode(req->file)->i_mode)) |
2745 | req->flags |= REQ_F_ISREG; | |
2746 | ||
2b188cc1 | 2747 | kiocb->ki_pos = READ_ONCE(sqe->off); |
ba04291e JA |
2748 | if (kiocb->ki_pos == -1 && !(req->file->f_mode & FMODE_STREAM)) { |
2749 | req->flags |= REQ_F_CUR_POS; | |
2750 | kiocb->ki_pos = req->file->f_pos; | |
2751 | } | |
2b188cc1 | 2752 | kiocb->ki_hint = ki_hint_validate(file_write_hint(kiocb->ki_filp)); |
3e577dcd PB |
2753 | kiocb->ki_flags = iocb_flags(kiocb->ki_filp); |
2754 | ret = kiocb_set_rw_flags(kiocb, READ_ONCE(sqe->rw_flags)); | |
2755 | if (unlikely(ret)) | |
2756 | return ret; | |
2b188cc1 JA |
2757 | |
2758 | ioprio = READ_ONCE(sqe->ioprio); | |
2759 | if (ioprio) { | |
2760 | ret = ioprio_check_cap(ioprio); | |
2761 | if (ret) | |
09bb8394 | 2762 | return ret; |
2b188cc1 JA |
2763 | |
2764 | kiocb->ki_ioprio = ioprio; | |
2765 | } else | |
2766 | kiocb->ki_ioprio = get_current_ioprio(); | |
2767 | ||
8449eeda | 2768 | /* don't allow async punt if RWF_NOWAIT was requested */ |
c5b85625 | 2769 | if (kiocb->ki_flags & IOCB_NOWAIT) |
8449eeda SB |
2770 | req->flags |= REQ_F_NOWAIT; |
2771 | ||
def596e9 | 2772 | if (ctx->flags & IORING_SETUP_IOPOLL) { |
def596e9 JA |
2773 | if (!(kiocb->ki_flags & IOCB_DIRECT) || |
2774 | !kiocb->ki_filp->f_op->iopoll) | |
09bb8394 | 2775 | return -EOPNOTSUPP; |
2b188cc1 | 2776 | |
def596e9 JA |
2777 | kiocb->ki_flags |= IOCB_HIPRI; |
2778 | kiocb->ki_complete = io_complete_rw_iopoll; | |
65a6543d | 2779 | req->iopoll_completed = 0; |
def596e9 | 2780 | } else { |
09bb8394 JA |
2781 | if (kiocb->ki_flags & IOCB_HIPRI) |
2782 | return -EINVAL; | |
def596e9 JA |
2783 | kiocb->ki_complete = io_complete_rw; |
2784 | } | |
9adbd45d | 2785 | |
3529d8c2 JA |
2786 | req->rw.addr = READ_ONCE(sqe->addr); |
2787 | req->rw.len = READ_ONCE(sqe->len); | |
4f4eeba8 | 2788 | req->buf_index = READ_ONCE(sqe->buf_index); |
2b188cc1 | 2789 | return 0; |
2b188cc1 JA |
2790 | } |
2791 | ||
2792 | static inline void io_rw_done(struct kiocb *kiocb, ssize_t ret) | |
2793 | { | |
2794 | switch (ret) { | |
2795 | case -EIOCBQUEUED: | |
2796 | break; | |
2797 | case -ERESTARTSYS: | |
2798 | case -ERESTARTNOINTR: | |
2799 | case -ERESTARTNOHAND: | |
2800 | case -ERESTART_RESTARTBLOCK: | |
2801 | /* | |
2802 | * We can't just restart the syscall, since previously | |
2803 | * submitted sqes may already be in progress. Just fail this | |
2804 | * IO with EINTR. | |
2805 | */ | |
2806 | ret = -EINTR; | |
df561f66 | 2807 | fallthrough; |
2b188cc1 JA |
2808 | default: |
2809 | kiocb->ki_complete(kiocb, ret, 0); | |
2810 | } | |
2811 | } | |
2812 | ||
a1d7c393 JA |
2813 | static void kiocb_done(struct kiocb *kiocb, ssize_t ret, |
2814 | struct io_comp_state *cs) | |
ba816ad6 | 2815 | { |
ba04291e | 2816 | struct io_kiocb *req = container_of(kiocb, struct io_kiocb, rw.kiocb); |
e8c2bc1f | 2817 | struct io_async_rw *io = req->async_data; |
ba04291e | 2818 | |
227c0c96 | 2819 | /* add previously done IO, if any */ |
e8c2bc1f | 2820 | if (io && io->bytes_done > 0) { |
227c0c96 | 2821 | if (ret < 0) |
e8c2bc1f | 2822 | ret = io->bytes_done; |
227c0c96 | 2823 | else |
e8c2bc1f | 2824 | ret += io->bytes_done; |
227c0c96 JA |
2825 | } |
2826 | ||
ba04291e JA |
2827 | if (req->flags & REQ_F_CUR_POS) |
2828 | req->file->f_pos = kiocb->ki_pos; | |
bcaec089 | 2829 | if (ret >= 0 && kiocb->ki_complete == io_complete_rw) |
a1d7c393 | 2830 | __io_complete_rw(req, ret, 0, cs); |
ba816ad6 JA |
2831 | else |
2832 | io_rw_done(kiocb, ret); | |
2833 | } | |
2834 | ||
9adbd45d | 2835 | static ssize_t io_import_fixed(struct io_kiocb *req, int rw, |
7d009165 | 2836 | struct iov_iter *iter) |
edafccee | 2837 | { |
9adbd45d JA |
2838 | struct io_ring_ctx *ctx = req->ctx; |
2839 | size_t len = req->rw.len; | |
edafccee | 2840 | struct io_mapped_ubuf *imu; |
4be1c615 | 2841 | u16 index, buf_index = req->buf_index; |
edafccee JA |
2842 | size_t offset; |
2843 | u64 buf_addr; | |
2844 | ||
edafccee JA |
2845 | if (unlikely(buf_index >= ctx->nr_user_bufs)) |
2846 | return -EFAULT; | |
edafccee JA |
2847 | index = array_index_nospec(buf_index, ctx->nr_user_bufs); |
2848 | imu = &ctx->user_bufs[index]; | |
9adbd45d | 2849 | buf_addr = req->rw.addr; |
edafccee JA |
2850 | |
2851 | /* overflow */ | |
2852 | if (buf_addr + len < buf_addr) | |
2853 | return -EFAULT; | |
2854 | /* not inside the mapped region */ | |
2855 | if (buf_addr < imu->ubuf || buf_addr + len > imu->ubuf + imu->len) | |
2856 | return -EFAULT; | |
2857 | ||
2858 | /* | |
2859 | * May not be a start of buffer, set size appropriately | |
2860 | * and advance us to the beginning. | |
2861 | */ | |
2862 | offset = buf_addr - imu->ubuf; | |
2863 | iov_iter_bvec(iter, rw, imu->bvec, imu->nr_bvecs, offset + len); | |
bd11b3a3 JA |
2864 | |
2865 | if (offset) { | |
2866 | /* | |
2867 | * Don't use iov_iter_advance() here, as it's really slow for | |
2868 | * using the latter parts of a big fixed buffer - it iterates | |
2869 | * over each segment manually. We can cheat a bit here, because | |
2870 | * we know that: | |
2871 | * | |
2872 | * 1) it's a BVEC iter, we set it up | |
2873 | * 2) all bvecs are PAGE_SIZE in size, except potentially the | |
2874 | * first and last bvec | |
2875 | * | |
2876 | * So just find our index, and adjust the iterator afterwards. | |
2877 | * If the offset is within the first bvec (or the whole first | |
2878 | * bvec, just use iov_iter_advance(). This makes it easier | |
2879 | * since we can just skip the first segment, which may not | |
2880 | * be PAGE_SIZE aligned. | |
2881 | */ | |
2882 | const struct bio_vec *bvec = imu->bvec; | |
2883 | ||
2884 | if (offset <= bvec->bv_len) { | |
2885 | iov_iter_advance(iter, offset); | |
2886 | } else { | |
2887 | unsigned long seg_skip; | |
2888 | ||
2889 | /* skip first vec */ | |
2890 | offset -= bvec->bv_len; | |
2891 | seg_skip = 1 + (offset >> PAGE_SHIFT); | |
2892 | ||
2893 | iter->bvec = bvec + seg_skip; | |
2894 | iter->nr_segs -= seg_skip; | |
99c79f66 | 2895 | iter->count -= bvec->bv_len + offset; |
bd11b3a3 | 2896 | iter->iov_offset = offset & ~PAGE_MASK; |
bd11b3a3 JA |
2897 | } |
2898 | } | |
2899 | ||
5e559561 | 2900 | return len; |
edafccee JA |
2901 | } |
2902 | ||
bcda7baa JA |
2903 | static void io_ring_submit_unlock(struct io_ring_ctx *ctx, bool needs_lock) |
2904 | { | |
2905 | if (needs_lock) | |
2906 | mutex_unlock(&ctx->uring_lock); | |
2907 | } | |
2908 | ||
2909 | static void io_ring_submit_lock(struct io_ring_ctx *ctx, bool needs_lock) | |
2910 | { | |
2911 | /* | |
2912 | * "Normal" inline submissions always hold the uring_lock, since we | |
2913 | * grab it from the system call. Same is true for the SQPOLL offload. | |
2914 | * The only exception is when we've detached the request and issue it | |
2915 | * from an async worker thread, grab the lock for that case. | |
2916 | */ | |
2917 | if (needs_lock) | |
2918 | mutex_lock(&ctx->uring_lock); | |
2919 | } | |
2920 | ||
2921 | static struct io_buffer *io_buffer_select(struct io_kiocb *req, size_t *len, | |
2922 | int bgid, struct io_buffer *kbuf, | |
2923 | bool needs_lock) | |
2924 | { | |
2925 | struct io_buffer *head; | |
2926 | ||
2927 | if (req->flags & REQ_F_BUFFER_SELECTED) | |
2928 | return kbuf; | |
2929 | ||
2930 | io_ring_submit_lock(req->ctx, needs_lock); | |
2931 | ||
2932 | lockdep_assert_held(&req->ctx->uring_lock); | |
2933 | ||
2934 | head = idr_find(&req->ctx->io_buffer_idr, bgid); | |
2935 | if (head) { | |
2936 | if (!list_empty(&head->list)) { | |
2937 | kbuf = list_last_entry(&head->list, struct io_buffer, | |
2938 | list); | |
2939 | list_del(&kbuf->list); | |
2940 | } else { | |
2941 | kbuf = head; | |
2942 | idr_remove(&req->ctx->io_buffer_idr, bgid); | |
2943 | } | |
2944 | if (*len > kbuf->len) | |
2945 | *len = kbuf->len; | |
2946 | } else { | |
2947 | kbuf = ERR_PTR(-ENOBUFS); | |
2948 | } | |
2949 | ||
2950 | io_ring_submit_unlock(req->ctx, needs_lock); | |
2951 | ||
2952 | return kbuf; | |
2953 | } | |
2954 | ||
4d954c25 JA |
2955 | static void __user *io_rw_buffer_select(struct io_kiocb *req, size_t *len, |
2956 | bool needs_lock) | |
2957 | { | |
2958 | struct io_buffer *kbuf; | |
4f4eeba8 | 2959 | u16 bgid; |
4d954c25 JA |
2960 | |
2961 | kbuf = (struct io_buffer *) (unsigned long) req->rw.addr; | |
4f4eeba8 | 2962 | bgid = req->buf_index; |
4d954c25 JA |
2963 | kbuf = io_buffer_select(req, len, bgid, kbuf, needs_lock); |
2964 | if (IS_ERR(kbuf)) | |
2965 | return kbuf; | |
2966 | req->rw.addr = (u64) (unsigned long) kbuf; | |
2967 | req->flags |= REQ_F_BUFFER_SELECTED; | |
2968 | return u64_to_user_ptr(kbuf->addr); | |
2969 | } | |
2970 | ||
2971 | #ifdef CONFIG_COMPAT | |
2972 | static ssize_t io_compat_import(struct io_kiocb *req, struct iovec *iov, | |
2973 | bool needs_lock) | |
2974 | { | |
2975 | struct compat_iovec __user *uiov; | |
2976 | compat_ssize_t clen; | |
2977 | void __user *buf; | |
2978 | ssize_t len; | |
2979 | ||
2980 | uiov = u64_to_user_ptr(req->rw.addr); | |
2981 | if (!access_ok(uiov, sizeof(*uiov))) | |
2982 | return -EFAULT; | |
2983 | if (__get_user(clen, &uiov->iov_len)) | |
2984 | return -EFAULT; | |
2985 | if (clen < 0) | |
2986 | return -EINVAL; | |
2987 | ||
2988 | len = clen; | |
2989 | buf = io_rw_buffer_select(req, &len, needs_lock); | |
2990 | if (IS_ERR(buf)) | |
2991 | return PTR_ERR(buf); | |
2992 | iov[0].iov_base = buf; | |
2993 | iov[0].iov_len = (compat_size_t) len; | |
2994 | return 0; | |
2995 | } | |
2996 | #endif | |
2997 | ||
2998 | static ssize_t __io_iov_buffer_select(struct io_kiocb *req, struct iovec *iov, | |
2999 | bool needs_lock) | |
3000 | { | |
3001 | struct iovec __user *uiov = u64_to_user_ptr(req->rw.addr); | |
3002 | void __user *buf; | |
3003 | ssize_t len; | |
3004 | ||
3005 | if (copy_from_user(iov, uiov, sizeof(*uiov))) | |
3006 | return -EFAULT; | |
3007 | ||
3008 | len = iov[0].iov_len; | |
3009 | if (len < 0) | |
3010 | return -EINVAL; | |
3011 | buf = io_rw_buffer_select(req, &len, needs_lock); | |
3012 | if (IS_ERR(buf)) | |
3013 | return PTR_ERR(buf); | |
3014 | iov[0].iov_base = buf; | |
3015 | iov[0].iov_len = len; | |
3016 | return 0; | |
3017 | } | |
3018 | ||
3019 | static ssize_t io_iov_buffer_select(struct io_kiocb *req, struct iovec *iov, | |
3020 | bool needs_lock) | |
3021 | { | |
dddb3e26 JA |
3022 | if (req->flags & REQ_F_BUFFER_SELECTED) { |
3023 | struct io_buffer *kbuf; | |
3024 | ||
3025 | kbuf = (struct io_buffer *) (unsigned long) req->rw.addr; | |
3026 | iov[0].iov_base = u64_to_user_ptr(kbuf->addr); | |
3027 | iov[0].iov_len = kbuf->len; | |
4d954c25 | 3028 | return 0; |
dddb3e26 | 3029 | } |
4d954c25 JA |
3030 | if (!req->rw.len) |
3031 | return 0; | |
3032 | else if (req->rw.len > 1) | |
3033 | return -EINVAL; | |
3034 | ||
3035 | #ifdef CONFIG_COMPAT | |
3036 | if (req->ctx->compat) | |
3037 | return io_compat_import(req, iov, needs_lock); | |
3038 | #endif | |
3039 | ||
3040 | return __io_iov_buffer_select(req, iov, needs_lock); | |
3041 | } | |
3042 | ||
8452fd0c JA |
3043 | static ssize_t __io_import_iovec(int rw, struct io_kiocb *req, |
3044 | struct iovec **iovec, struct iov_iter *iter, | |
3045 | bool needs_lock) | |
2b188cc1 | 3046 | { |
9adbd45d JA |
3047 | void __user *buf = u64_to_user_ptr(req->rw.addr); |
3048 | size_t sqe_len = req->rw.len; | |
4d954c25 | 3049 | ssize_t ret; |
edafccee JA |
3050 | u8 opcode; |
3051 | ||
d625c6ee | 3052 | opcode = req->opcode; |
7d009165 | 3053 | if (opcode == IORING_OP_READ_FIXED || opcode == IORING_OP_WRITE_FIXED) { |
edafccee | 3054 | *iovec = NULL; |
9adbd45d | 3055 | return io_import_fixed(req, rw, iter); |
edafccee | 3056 | } |
2b188cc1 | 3057 | |
bcda7baa | 3058 | /* buffer index only valid with fixed read/write, or buffer select */ |
4f4eeba8 | 3059 | if (req->buf_index && !(req->flags & REQ_F_BUFFER_SELECT)) |
9adbd45d JA |
3060 | return -EINVAL; |
3061 | ||
3a6820f2 | 3062 | if (opcode == IORING_OP_READ || opcode == IORING_OP_WRITE) { |
bcda7baa | 3063 | if (req->flags & REQ_F_BUFFER_SELECT) { |
4d954c25 | 3064 | buf = io_rw_buffer_select(req, &sqe_len, needs_lock); |
867a23ea | 3065 | if (IS_ERR(buf)) |
4d954c25 | 3066 | return PTR_ERR(buf); |
3f9d6441 | 3067 | req->rw.len = sqe_len; |
bcda7baa JA |
3068 | } |
3069 | ||
3a6820f2 JA |
3070 | ret = import_single_range(rw, buf, sqe_len, *iovec, iter); |
3071 | *iovec = NULL; | |
3a901598 | 3072 | return ret < 0 ? ret : sqe_len; |
3a6820f2 JA |
3073 | } |
3074 | ||
4d954c25 JA |
3075 | if (req->flags & REQ_F_BUFFER_SELECT) { |
3076 | ret = io_iov_buffer_select(req, *iovec, needs_lock); | |
3f9d6441 JA |
3077 | if (!ret) { |
3078 | ret = (*iovec)->iov_len; | |
3079 | iov_iter_init(iter, rw, *iovec, 1, ret); | |
3080 | } | |
4d954c25 JA |
3081 | *iovec = NULL; |
3082 | return ret; | |
3083 | } | |
3084 | ||
89cd35c5 CH |
3085 | return __import_iovec(rw, buf, sqe_len, UIO_FASTIOV, iovec, iter, |
3086 | req->ctx->compat); | |
2b188cc1 JA |
3087 | } |
3088 | ||
8452fd0c JA |
3089 | static ssize_t io_import_iovec(int rw, struct io_kiocb *req, |
3090 | struct iovec **iovec, struct iov_iter *iter, | |
3091 | bool needs_lock) | |
3092 | { | |
e8c2bc1f JA |
3093 | struct io_async_rw *iorw = req->async_data; |
3094 | ||
3095 | if (!iorw) | |
8452fd0c JA |
3096 | return __io_import_iovec(rw, req, iovec, iter, needs_lock); |
3097 | *iovec = NULL; | |
e8c2bc1f | 3098 | return iov_iter_count(&iorw->iter); |
8452fd0c JA |
3099 | } |
3100 | ||
0fef9483 JA |
3101 | static inline loff_t *io_kiocb_ppos(struct kiocb *kiocb) |
3102 | { | |
5b09e37e | 3103 | return (kiocb->ki_filp->f_mode & FMODE_STREAM) ? NULL : &kiocb->ki_pos; |
0fef9483 JA |
3104 | } |
3105 | ||
31b51510 | 3106 | /* |
32960613 JA |
3107 | * For files that don't have ->read_iter() and ->write_iter(), handle them |
3108 | * by looping over ->read() or ->write() manually. | |
31b51510 | 3109 | */ |
32960613 JA |
3110 | static ssize_t loop_rw_iter(int rw, struct file *file, struct kiocb *kiocb, |
3111 | struct iov_iter *iter) | |
3112 | { | |
3113 | ssize_t ret = 0; | |
3114 | ||
3115 | /* | |
3116 | * Don't support polled IO through this interface, and we can't | |
3117 | * support non-blocking either. For the latter, this just causes | |
3118 | * the kiocb to be handled from an async context. | |
3119 | */ | |
3120 | if (kiocb->ki_flags & IOCB_HIPRI) | |
3121 | return -EOPNOTSUPP; | |
3122 | if (kiocb->ki_flags & IOCB_NOWAIT) | |
3123 | return -EAGAIN; | |
3124 | ||
3125 | while (iov_iter_count(iter)) { | |
311ae9e1 | 3126 | struct iovec iovec; |
32960613 JA |
3127 | ssize_t nr; |
3128 | ||
311ae9e1 PB |
3129 | if (!iov_iter_is_bvec(iter)) { |
3130 | iovec = iov_iter_iovec(iter); | |
3131 | } else { | |
3132 | /* fixed buffers import bvec */ | |
3133 | iovec.iov_base = kmap(iter->bvec->bv_page) | |
3134 | + iter->iov_offset; | |
3135 | iovec.iov_len = min(iter->count, | |
3136 | iter->bvec->bv_len - iter->iov_offset); | |
3137 | } | |
3138 | ||
32960613 JA |
3139 | if (rw == READ) { |
3140 | nr = file->f_op->read(file, iovec.iov_base, | |
0fef9483 | 3141 | iovec.iov_len, io_kiocb_ppos(kiocb)); |
32960613 JA |
3142 | } else { |
3143 | nr = file->f_op->write(file, iovec.iov_base, | |
0fef9483 | 3144 | iovec.iov_len, io_kiocb_ppos(kiocb)); |
32960613 JA |
3145 | } |
3146 | ||
311ae9e1 PB |
3147 | if (iov_iter_is_bvec(iter)) |
3148 | kunmap(iter->bvec->bv_page); | |
3149 | ||
32960613 JA |
3150 | if (nr < 0) { |
3151 | if (!ret) | |
3152 | ret = nr; | |
3153 | break; | |
3154 | } | |
3155 | ret += nr; | |
3156 | if (nr != iovec.iov_len) | |
3157 | break; | |
3158 | iov_iter_advance(iter, nr); | |
3159 | } | |
3160 | ||
3161 | return ret; | |
3162 | } | |
3163 | ||
ff6165b2 JA |
3164 | static void io_req_map_rw(struct io_kiocb *req, const struct iovec *iovec, |
3165 | const struct iovec *fast_iov, struct iov_iter *iter) | |
f67676d1 | 3166 | { |
e8c2bc1f | 3167 | struct io_async_rw *rw = req->async_data; |
b64e3444 | 3168 | |
ff6165b2 | 3169 | memcpy(&rw->iter, iter, sizeof(*iter)); |
afb87658 | 3170 | rw->free_iovec = iovec; |
227c0c96 | 3171 | rw->bytes_done = 0; |
ff6165b2 JA |
3172 | /* can only be fixed buffers, no need to do anything */ |
3173 | if (iter->type == ITER_BVEC) | |
3174 | return; | |
b64e3444 | 3175 | if (!iovec) { |
ff6165b2 JA |
3176 | unsigned iov_off = 0; |
3177 | ||
3178 | rw->iter.iov = rw->fast_iov; | |
3179 | if (iter->iov != fast_iov) { | |
3180 | iov_off = iter->iov - fast_iov; | |
3181 | rw->iter.iov += iov_off; | |
3182 | } | |
3183 | if (rw->fast_iov != fast_iov) | |
3184 | memcpy(rw->fast_iov + iov_off, fast_iov + iov_off, | |
45097dae | 3185 | sizeof(struct iovec) * iter->nr_segs); |
99bc4c38 PB |
3186 | } else { |
3187 | req->flags |= REQ_F_NEED_CLEANUP; | |
f67676d1 JA |
3188 | } |
3189 | } | |
3190 | ||
e8c2bc1f | 3191 | static inline int __io_alloc_async_data(struct io_kiocb *req) |
3d9932a8 | 3192 | { |
e8c2bc1f JA |
3193 | WARN_ON_ONCE(!io_op_defs[req->opcode].async_size); |
3194 | req->async_data = kmalloc(io_op_defs[req->opcode].async_size, GFP_KERNEL); | |
3195 | return req->async_data == NULL; | |
3d9932a8 XW |
3196 | } |
3197 | ||
e8c2bc1f | 3198 | static int io_alloc_async_data(struct io_kiocb *req) |
f67676d1 | 3199 | { |
e8c2bc1f | 3200 | if (!io_op_defs[req->opcode].needs_async_data) |
d3656344 | 3201 | return 0; |
3d9932a8 | 3202 | |
e8c2bc1f | 3203 | return __io_alloc_async_data(req); |
b7bb4f7d JA |
3204 | } |
3205 | ||
ff6165b2 JA |
3206 | static int io_setup_async_rw(struct io_kiocb *req, const struct iovec *iovec, |
3207 | const struct iovec *fast_iov, | |
227c0c96 | 3208 | struct iov_iter *iter, bool force) |
b7bb4f7d | 3209 | { |
e8c2bc1f | 3210 | if (!force && !io_op_defs[req->opcode].needs_async_data) |
74566df3 | 3211 | return 0; |
e8c2bc1f JA |
3212 | if (!req->async_data) { |
3213 | if (__io_alloc_async_data(req)) | |
5d204bcf | 3214 | return -ENOMEM; |
b7bb4f7d | 3215 | |
ff6165b2 | 3216 | io_req_map_rw(req, iovec, fast_iov, iter); |
5d204bcf | 3217 | } |
b7bb4f7d | 3218 | return 0; |
f67676d1 JA |
3219 | } |
3220 | ||
73debe68 | 3221 | static inline int io_rw_prep_async(struct io_kiocb *req, int rw) |
c3e330a4 | 3222 | { |
e8c2bc1f | 3223 | struct io_async_rw *iorw = req->async_data; |
f4bff104 | 3224 | struct iovec *iov = iorw->fast_iov; |
c3e330a4 PB |
3225 | ssize_t ret; |
3226 | ||
73debe68 | 3227 | ret = __io_import_iovec(rw, req, &iov, &iorw->iter, false); |
c3e330a4 PB |
3228 | if (unlikely(ret < 0)) |
3229 | return ret; | |
3230 | ||
ab0b196c PB |
3231 | iorw->bytes_done = 0; |
3232 | iorw->free_iovec = iov; | |
3233 | if (iov) | |
3234 | req->flags |= REQ_F_NEED_CLEANUP; | |
c3e330a4 PB |
3235 | return 0; |
3236 | } | |
3237 | ||
73debe68 | 3238 | static int io_read_prep(struct io_kiocb *req, const struct io_uring_sqe *sqe) |
f67676d1 JA |
3239 | { |
3240 | ssize_t ret; | |
3241 | ||
a88fc400 | 3242 | ret = io_prep_rw(req, sqe); |
3529d8c2 JA |
3243 | if (ret) |
3244 | return ret; | |
f67676d1 | 3245 | |
3529d8c2 JA |
3246 | if (unlikely(!(req->file->f_mode & FMODE_READ))) |
3247 | return -EBADF; | |
f67676d1 | 3248 | |
5f798bea | 3249 | /* either don't need iovec imported or already have it */ |
2d199895 | 3250 | if (!req->async_data) |
3529d8c2 | 3251 | return 0; |
73debe68 | 3252 | return io_rw_prep_async(req, READ); |
f67676d1 JA |
3253 | } |
3254 | ||
c1dd91d1 JA |
3255 | /* |
3256 | * This is our waitqueue callback handler, registered through lock_page_async() | |
3257 | * when we initially tried to do the IO with the iocb armed our waitqueue. | |
3258 | * This gets called when the page is unlocked, and we generally expect that to | |
3259 | * happen when the page IO is completed and the page is now uptodate. This will | |
3260 | * queue a task_work based retry of the operation, attempting to copy the data | |
3261 | * again. If the latter fails because the page was NOT uptodate, then we will | |
3262 | * do a thread based blocking retry of the operation. That's the unexpected | |
3263 | * slow path. | |
3264 | */ | |
bcf5a063 JA |
3265 | static int io_async_buf_func(struct wait_queue_entry *wait, unsigned mode, |
3266 | int sync, void *arg) | |
3267 | { | |
3268 | struct wait_page_queue *wpq; | |
3269 | struct io_kiocb *req = wait->private; | |
bcf5a063 | 3270 | struct wait_page_key *key = arg; |
bcf5a063 JA |
3271 | int ret; |
3272 | ||
3273 | wpq = container_of(wait, struct wait_page_queue, wait); | |
3274 | ||
cdc8fcb4 LT |
3275 | if (!wake_page_match(wpq, key)) |
3276 | return 0; | |
3277 | ||
c8d317aa | 3278 | req->rw.kiocb.ki_flags &= ~IOCB_WAITQ; |
bcf5a063 JA |
3279 | list_del_init(&wait->entry); |
3280 | ||
e7375122 | 3281 | init_task_work(&req->task_work, io_req_task_submit); |
6d816e08 JA |
3282 | percpu_ref_get(&req->ctx->refs); |
3283 | ||
bcf5a063 JA |
3284 | /* submit ref gets dropped, acquire a new one */ |
3285 | refcount_inc(&req->refs); | |
87c4311f | 3286 | ret = io_req_task_work_add(req, true); |
bcf5a063 | 3287 | if (unlikely(ret)) { |
c2c4c83c JA |
3288 | struct task_struct *tsk; |
3289 | ||
bcf5a063 | 3290 | /* queue just for cancelation */ |
e7375122 | 3291 | init_task_work(&req->task_work, io_req_task_cancel); |
bcf5a063 | 3292 | tsk = io_wq_get_task(req->ctx->io_wq); |
e7375122 | 3293 | task_work_add(tsk, &req->task_work, 0); |
c2c4c83c | 3294 | wake_up_process(tsk); |
bcf5a063 | 3295 | } |
bcf5a063 JA |
3296 | return 1; |
3297 | } | |
3298 | ||
c1dd91d1 JA |
3299 | /* |
3300 | * This controls whether a given IO request should be armed for async page | |
3301 | * based retry. If we return false here, the request is handed to the async | |
3302 | * worker threads for retry. If we're doing buffered reads on a regular file, | |
3303 | * we prepare a private wait_page_queue entry and retry the operation. This | |
3304 | * will either succeed because the page is now uptodate and unlocked, or it | |
3305 | * will register a callback when the page is unlocked at IO completion. Through | |
3306 | * that callback, io_uring uses task_work to setup a retry of the operation. | |
3307 | * That retry will attempt the buffered read again. The retry will generally | |
3308 | * succeed, or in rare cases where it fails, we then fall back to using the | |
3309 | * async worker threads for a blocking retry. | |
3310 | */ | |
227c0c96 | 3311 | static bool io_rw_should_retry(struct io_kiocb *req) |
f67676d1 | 3312 | { |
e8c2bc1f JA |
3313 | struct io_async_rw *rw = req->async_data; |
3314 | struct wait_page_queue *wait = &rw->wpq; | |
bcf5a063 | 3315 | struct kiocb *kiocb = &req->rw.kiocb; |
f67676d1 | 3316 | |
bcf5a063 JA |
3317 | /* never retry for NOWAIT, we just complete with -EAGAIN */ |
3318 | if (req->flags & REQ_F_NOWAIT) | |
3319 | return false; | |
f67676d1 | 3320 | |
227c0c96 | 3321 | /* Only for buffered IO */ |
3b2a4439 | 3322 | if (kiocb->ki_flags & (IOCB_DIRECT | IOCB_HIPRI)) |
bcf5a063 | 3323 | return false; |
3b2a4439 | 3324 | |
bcf5a063 JA |
3325 | /* |
3326 | * just use poll if we can, and don't attempt if the fs doesn't | |
3327 | * support callback based unlocks | |
3328 | */ | |
3329 | if (file_can_poll(req->file) || !(req->file->f_mode & FMODE_BUF_RASYNC)) | |
3330 | return false; | |
f67676d1 | 3331 | |
3b2a4439 JA |
3332 | wait->wait.func = io_async_buf_func; |
3333 | wait->wait.private = req; | |
3334 | wait->wait.flags = 0; | |
3335 | INIT_LIST_HEAD(&wait->wait.entry); | |
3336 | kiocb->ki_flags |= IOCB_WAITQ; | |
c8d317aa | 3337 | kiocb->ki_flags &= ~IOCB_NOWAIT; |
3b2a4439 | 3338 | kiocb->ki_waitq = wait; |
3b2a4439 | 3339 | return true; |
bcf5a063 JA |
3340 | } |
3341 | ||
3342 | static int io_iter_do_read(struct io_kiocb *req, struct iov_iter *iter) | |
3343 | { | |
3344 | if (req->file->f_op->read_iter) | |
3345 | return call_read_iter(req->file, &req->rw.kiocb, iter); | |
2dd2111d GH |
3346 | else if (req->file->f_op->read) |
3347 | return loop_rw_iter(READ, req->file, &req->rw.kiocb, iter); | |
3348 | else | |
3349 | return -EINVAL; | |
f67676d1 JA |
3350 | } |
3351 | ||
a1d7c393 JA |
3352 | static int io_read(struct io_kiocb *req, bool force_nonblock, |
3353 | struct io_comp_state *cs) | |
2b188cc1 JA |
3354 | { |
3355 | struct iovec inline_vecs[UIO_FASTIOV], *iovec = inline_vecs; | |
9adbd45d | 3356 | struct kiocb *kiocb = &req->rw.kiocb; |
ff6165b2 | 3357 | struct iov_iter __iter, *iter = &__iter; |
e8c2bc1f | 3358 | struct io_async_rw *rw = req->async_data; |
227c0c96 | 3359 | ssize_t io_size, ret, ret2; |
31b51510 | 3360 | size_t iov_count; |
f5cac8b1 | 3361 | bool no_async; |
ff6165b2 | 3362 | |
e8c2bc1f JA |
3363 | if (rw) |
3364 | iter = &rw->iter; | |
2b188cc1 | 3365 | |
ff6165b2 | 3366 | ret = io_import_iovec(READ, req, &iovec, iter, !force_nonblock); |
06b76d44 JA |
3367 | if (ret < 0) |
3368 | return ret; | |
eefdf30f | 3369 | iov_count = iov_iter_count(iter); |
fa15bafb PB |
3370 | io_size = ret; |
3371 | req->result = io_size; | |
227c0c96 | 3372 | ret = 0; |
2b188cc1 | 3373 | |
fd6c2e4c JA |
3374 | /* Ensure we clear previously set non-block flag */ |
3375 | if (!force_nonblock) | |
29de5f6a | 3376 | kiocb->ki_flags &= ~IOCB_NOWAIT; |
a88fc400 PB |
3377 | else |
3378 | kiocb->ki_flags |= IOCB_NOWAIT; | |
3379 | ||
fd6c2e4c | 3380 | |
24c74678 | 3381 | /* If the file doesn't support async, just async punt */ |
f5cac8b1 JA |
3382 | no_async = force_nonblock && !io_file_supports_async(req->file, READ); |
3383 | if (no_async) | |
f67676d1 | 3384 | goto copy_iov; |
9e645e11 | 3385 | |
0fef9483 | 3386 | ret = rw_verify_area(READ, req->file, io_kiocb_ppos(kiocb), iov_count); |
fa15bafb PB |
3387 | if (unlikely(ret)) |
3388 | goto out_free; | |
2b188cc1 | 3389 | |
227c0c96 | 3390 | ret = io_iter_do_read(req, iter); |
32960613 | 3391 | |
227c0c96 JA |
3392 | if (!ret) { |
3393 | goto done; | |
3394 | } else if (ret == -EIOCBQUEUED) { | |
3395 | ret = 0; | |
3396 | goto out_free; | |
3397 | } else if (ret == -EAGAIN) { | |
eefdf30f JA |
3398 | /* IOPOLL retry should happen for io-wq threads */ |
3399 | if (!force_nonblock && !(req->ctx->flags & IORING_SETUP_IOPOLL)) | |
f91daf56 | 3400 | goto done; |
355afaeb JA |
3401 | /* no retry on NONBLOCK marked file */ |
3402 | if (req->file->f_flags & O_NONBLOCK) | |
3403 | goto done; | |
84216315 JA |
3404 | /* some cases will consume bytes even on error returns */ |
3405 | iov_iter_revert(iter, iov_count - iov_iter_count(iter)); | |
f38c7e3a JA |
3406 | ret = 0; |
3407 | goto copy_iov; | |
227c0c96 | 3408 | } else if (ret < 0) { |
00d23d51 JA |
3409 | /* make sure -ERESTARTSYS -> -EINTR is done */ |
3410 | goto done; | |
227c0c96 JA |
3411 | } |
3412 | ||
3413 | /* read it all, or we did blocking attempt. no retry. */ | |
f91daf56 JA |
3414 | if (!iov_iter_count(iter) || !force_nonblock || |
3415 | (req->file->f_flags & O_NONBLOCK)) | |
227c0c96 JA |
3416 | goto done; |
3417 | ||
3418 | io_size -= ret; | |
3419 | copy_iov: | |
3420 | ret2 = io_setup_async_rw(req, iovec, inline_vecs, iter, true); | |
3421 | if (ret2) { | |
3422 | ret = ret2; | |
3423 | goto out_free; | |
3424 | } | |
f5cac8b1 JA |
3425 | if (no_async) |
3426 | return -EAGAIN; | |
e8c2bc1f | 3427 | rw = req->async_data; |
227c0c96 JA |
3428 | /* it's copied and will be cleaned with ->io */ |
3429 | iovec = NULL; | |
3430 | /* now use our persistent iterator, if we aren't already */ | |
e8c2bc1f | 3431 | iter = &rw->iter; |
227c0c96 | 3432 | retry: |
e8c2bc1f | 3433 | rw->bytes_done += ret; |
227c0c96 JA |
3434 | /* if we can retry, do so with the callbacks armed */ |
3435 | if (!io_rw_should_retry(req)) { | |
fa15bafb PB |
3436 | kiocb->ki_flags &= ~IOCB_WAITQ; |
3437 | return -EAGAIN; | |
2b188cc1 | 3438 | } |
227c0c96 JA |
3439 | |
3440 | /* | |
3441 | * Now retry read with the IOCB_WAITQ parts set in the iocb. If we | |
3442 | * get -EIOCBQUEUED, then we'll get a notification when the desired | |
3443 | * page gets unlocked. We can also get a partial read here, and if we | |
3444 | * do, then just retry at the new offset. | |
3445 | */ | |
3446 | ret = io_iter_do_read(req, iter); | |
3447 | if (ret == -EIOCBQUEUED) { | |
3448 | ret = 0; | |
3449 | goto out_free; | |
3450 | } else if (ret > 0 && ret < io_size) { | |
3451 | /* we got some bytes, but not all. retry. */ | |
3452 | goto retry; | |
3453 | } | |
3454 | done: | |
3455 | kiocb_done(kiocb, ret, cs); | |
3456 | ret = 0; | |
f67676d1 | 3457 | out_free: |
f261c168 | 3458 | /* it's reportedly faster than delegating the null check to kfree() */ |
252917c3 | 3459 | if (iovec) |
6f2cc166 | 3460 | kfree(iovec); |
2b188cc1 JA |
3461 | return ret; |
3462 | } | |
3463 | ||
73debe68 | 3464 | static int io_write_prep(struct io_kiocb *req, const struct io_uring_sqe *sqe) |
f67676d1 JA |
3465 | { |
3466 | ssize_t ret; | |
3467 | ||
a88fc400 | 3468 | ret = io_prep_rw(req, sqe); |
3529d8c2 JA |
3469 | if (ret) |
3470 | return ret; | |
f67676d1 | 3471 | |
3529d8c2 JA |
3472 | if (unlikely(!(req->file->f_mode & FMODE_WRITE))) |
3473 | return -EBADF; | |
f67676d1 | 3474 | |
5f798bea | 3475 | /* either don't need iovec imported or already have it */ |
2d199895 | 3476 | if (!req->async_data) |
3529d8c2 | 3477 | return 0; |
73debe68 | 3478 | return io_rw_prep_async(req, WRITE); |
f67676d1 JA |
3479 | } |
3480 | ||
a1d7c393 JA |
3481 | static int io_write(struct io_kiocb *req, bool force_nonblock, |
3482 | struct io_comp_state *cs) | |
2b188cc1 JA |
3483 | { |
3484 | struct iovec inline_vecs[UIO_FASTIOV], *iovec = inline_vecs; | |
9adbd45d | 3485 | struct kiocb *kiocb = &req->rw.kiocb; |
ff6165b2 | 3486 | struct iov_iter __iter, *iter = &__iter; |
e8c2bc1f | 3487 | struct io_async_rw *rw = req->async_data; |
31b51510 | 3488 | size_t iov_count; |
fa15bafb | 3489 | ssize_t ret, ret2, io_size; |
2b188cc1 | 3490 | |
e8c2bc1f JA |
3491 | if (rw) |
3492 | iter = &rw->iter; | |
ff6165b2 JA |
3493 | |
3494 | ret = io_import_iovec(WRITE, req, &iovec, iter, !force_nonblock); | |
06b76d44 JA |
3495 | if (ret < 0) |
3496 | return ret; | |
eefdf30f | 3497 | iov_count = iov_iter_count(iter); |
fa15bafb PB |
3498 | io_size = ret; |
3499 | req->result = io_size; | |
2b188cc1 | 3500 | |
fd6c2e4c JA |
3501 | /* Ensure we clear previously set non-block flag */ |
3502 | if (!force_nonblock) | |
a88fc400 PB |
3503 | kiocb->ki_flags &= ~IOCB_NOWAIT; |
3504 | else | |
3505 | kiocb->ki_flags |= IOCB_NOWAIT; | |
fd6c2e4c | 3506 | |
24c74678 | 3507 | /* If the file doesn't support async, just async punt */ |
af197f50 | 3508 | if (force_nonblock && !io_file_supports_async(req->file, WRITE)) |
f67676d1 | 3509 | goto copy_iov; |
31b51510 | 3510 | |
10d59345 JA |
3511 | /* file path doesn't support NOWAIT for non-direct_IO */ |
3512 | if (force_nonblock && !(kiocb->ki_flags & IOCB_DIRECT) && | |
3513 | (req->flags & REQ_F_ISREG)) | |
f67676d1 | 3514 | goto copy_iov; |
31b51510 | 3515 | |
0fef9483 | 3516 | ret = rw_verify_area(WRITE, req->file, io_kiocb_ppos(kiocb), iov_count); |
fa15bafb PB |
3517 | if (unlikely(ret)) |
3518 | goto out_free; | |
4ed734b0 | 3519 | |
fa15bafb PB |
3520 | /* |
3521 | * Open-code file_start_write here to grab freeze protection, | |
3522 | * which will be released by another thread in | |
3523 | * io_complete_rw(). Fool lockdep by telling it the lock got | |
3524 | * released so that it doesn't complain about the held lock when | |
3525 | * we return to userspace. | |
3526 | */ | |
3527 | if (req->flags & REQ_F_ISREG) { | |
3528 | __sb_start_write(file_inode(req->file)->i_sb, | |
3529 | SB_FREEZE_WRITE, true); | |
3530 | __sb_writers_release(file_inode(req->file)->i_sb, | |
3531 | SB_FREEZE_WRITE); | |
3532 | } | |
3533 | kiocb->ki_flags |= IOCB_WRITE; | |
4ed734b0 | 3534 | |
fa15bafb | 3535 | if (req->file->f_op->write_iter) |
ff6165b2 | 3536 | ret2 = call_write_iter(req->file, kiocb, iter); |
2dd2111d | 3537 | else if (req->file->f_op->write) |
ff6165b2 | 3538 | ret2 = loop_rw_iter(WRITE, req->file, kiocb, iter); |
2dd2111d GH |
3539 | else |
3540 | ret2 = -EINVAL; | |
4ed734b0 | 3541 | |
fa15bafb PB |
3542 | /* |
3543 | * Raw bdev writes will return -EOPNOTSUPP for IOCB_NOWAIT. Just | |
3544 | * retry them without IOCB_NOWAIT. | |
3545 | */ | |
3546 | if (ret2 == -EOPNOTSUPP && (kiocb->ki_flags & IOCB_NOWAIT)) | |
3547 | ret2 = -EAGAIN; | |
355afaeb JA |
3548 | /* no retry on NONBLOCK marked file */ |
3549 | if (ret2 == -EAGAIN && (req->file->f_flags & O_NONBLOCK)) | |
3550 | goto done; | |
fa15bafb | 3551 | if (!force_nonblock || ret2 != -EAGAIN) { |
eefdf30f JA |
3552 | /* IOPOLL retry should happen for io-wq threads */ |
3553 | if ((req->ctx->flags & IORING_SETUP_IOPOLL) && ret2 == -EAGAIN) | |
3554 | goto copy_iov; | |
355afaeb | 3555 | done: |
fa15bafb PB |
3556 | kiocb_done(kiocb, ret2, cs); |
3557 | } else { | |
f67676d1 | 3558 | copy_iov: |
84216315 JA |
3559 | /* some cases will consume bytes even on error returns */ |
3560 | iov_iter_revert(iter, iov_count - iov_iter_count(iter)); | |
227c0c96 | 3561 | ret = io_setup_async_rw(req, iovec, inline_vecs, iter, false); |
ff6165b2 JA |
3562 | if (!ret) |
3563 | return -EAGAIN; | |
2b188cc1 | 3564 | } |
31b51510 | 3565 | out_free: |
f261c168 | 3566 | /* it's reportedly faster than delegating the null check to kfree() */ |
252917c3 | 3567 | if (iovec) |
6f2cc166 | 3568 | kfree(iovec); |
2b188cc1 JA |
3569 | return ret; |
3570 | } | |
3571 | ||
f2a8d5c7 PB |
3572 | static int __io_splice_prep(struct io_kiocb *req, |
3573 | const struct io_uring_sqe *sqe) | |
7d67af2c PB |
3574 | { |
3575 | struct io_splice* sp = &req->splice; | |
3576 | unsigned int valid_flags = SPLICE_F_FD_IN_FIXED | SPLICE_F_ALL; | |
7d67af2c | 3577 | |
3232dd02 PB |
3578 | if (unlikely(req->ctx->flags & IORING_SETUP_IOPOLL)) |
3579 | return -EINVAL; | |
7d67af2c PB |
3580 | |
3581 | sp->file_in = NULL; | |
7d67af2c PB |
3582 | sp->len = READ_ONCE(sqe->len); |
3583 | sp->flags = READ_ONCE(sqe->splice_flags); | |
3584 | ||
3585 | if (unlikely(sp->flags & ~valid_flags)) | |
3586 | return -EINVAL; | |
3587 | ||
8371adf5 PB |
3588 | sp->file_in = io_file_get(NULL, req, READ_ONCE(sqe->splice_fd_in), |
3589 | (sp->flags & SPLICE_F_FD_IN_FIXED)); | |
3590 | if (!sp->file_in) | |
3591 | return -EBADF; | |
7d67af2c PB |
3592 | req->flags |= REQ_F_NEED_CLEANUP; |
3593 | ||
7cdaf587 XW |
3594 | if (!S_ISREG(file_inode(sp->file_in)->i_mode)) { |
3595 | /* | |
3596 | * Splice operation will be punted aync, and here need to | |
3597 | * modify io_wq_work.flags, so initialize io_wq_work firstly. | |
3598 | */ | |
3599 | io_req_init_async(req); | |
7d67af2c | 3600 | req->work.flags |= IO_WQ_WORK_UNBOUND; |
7cdaf587 | 3601 | } |
7d67af2c PB |
3602 | |
3603 | return 0; | |
3604 | } | |
3605 | ||
f2a8d5c7 PB |
3606 | static int io_tee_prep(struct io_kiocb *req, |
3607 | const struct io_uring_sqe *sqe) | |
3608 | { | |
3609 | if (READ_ONCE(sqe->splice_off_in) || READ_ONCE(sqe->off)) | |
3610 | return -EINVAL; | |
3611 | return __io_splice_prep(req, sqe); | |
3612 | } | |
3613 | ||
3614 | static int io_tee(struct io_kiocb *req, bool force_nonblock) | |
3615 | { | |
3616 | struct io_splice *sp = &req->splice; | |
3617 | struct file *in = sp->file_in; | |
3618 | struct file *out = sp->file_out; | |
3619 | unsigned int flags = sp->flags & ~SPLICE_F_FD_IN_FIXED; | |
3620 | long ret = 0; | |
3621 | ||
3622 | if (force_nonblock) | |
3623 | return -EAGAIN; | |
3624 | if (sp->len) | |
3625 | ret = do_tee(in, out, sp->len, flags); | |
3626 | ||
3627 | io_put_file(req, in, (sp->flags & SPLICE_F_FD_IN_FIXED)); | |
3628 | req->flags &= ~REQ_F_NEED_CLEANUP; | |
3629 | ||
f2a8d5c7 PB |
3630 | if (ret != sp->len) |
3631 | req_set_fail_links(req); | |
e1e16097 | 3632 | io_req_complete(req, ret); |
f2a8d5c7 PB |
3633 | return 0; |
3634 | } | |
3635 | ||
3636 | static int io_splice_prep(struct io_kiocb *req, const struct io_uring_sqe *sqe) | |
3637 | { | |
3638 | struct io_splice* sp = &req->splice; | |
3639 | ||
3640 | sp->off_in = READ_ONCE(sqe->splice_off_in); | |
3641 | sp->off_out = READ_ONCE(sqe->off); | |
3642 | return __io_splice_prep(req, sqe); | |
3643 | } | |
3644 | ||
014db007 | 3645 | static int io_splice(struct io_kiocb *req, bool force_nonblock) |
7d67af2c PB |
3646 | { |
3647 | struct io_splice *sp = &req->splice; | |
3648 | struct file *in = sp->file_in; | |
3649 | struct file *out = sp->file_out; | |
3650 | unsigned int flags = sp->flags & ~SPLICE_F_FD_IN_FIXED; | |
3651 | loff_t *poff_in, *poff_out; | |
c9687426 | 3652 | long ret = 0; |
7d67af2c | 3653 | |
2fb3e822 PB |
3654 | if (force_nonblock) |
3655 | return -EAGAIN; | |
7d67af2c PB |
3656 | |
3657 | poff_in = (sp->off_in == -1) ? NULL : &sp->off_in; | |
3658 | poff_out = (sp->off_out == -1) ? NULL : &sp->off_out; | |
c9687426 | 3659 | |
948a7749 | 3660 | if (sp->len) |
c9687426 | 3661 | ret = do_splice(in, poff_in, out, poff_out, sp->len, flags); |
7d67af2c PB |
3662 | |
3663 | io_put_file(req, in, (sp->flags & SPLICE_F_FD_IN_FIXED)); | |
3664 | req->flags &= ~REQ_F_NEED_CLEANUP; | |
3665 | ||
7d67af2c PB |
3666 | if (ret != sp->len) |
3667 | req_set_fail_links(req); | |
e1e16097 | 3668 | io_req_complete(req, ret); |
7d67af2c PB |
3669 | return 0; |
3670 | } | |
3671 | ||
2b188cc1 JA |
3672 | /* |
3673 | * IORING_OP_NOP just posts a completion event, nothing else. | |
3674 | */ | |
229a7b63 | 3675 | static int io_nop(struct io_kiocb *req, struct io_comp_state *cs) |
2b188cc1 JA |
3676 | { |
3677 | struct io_ring_ctx *ctx = req->ctx; | |
2b188cc1 | 3678 | |
def596e9 JA |
3679 | if (unlikely(ctx->flags & IORING_SETUP_IOPOLL)) |
3680 | return -EINVAL; | |
3681 | ||
229a7b63 | 3682 | __io_req_complete(req, 0, 0, cs); |
2b188cc1 JA |
3683 | return 0; |
3684 | } | |
3685 | ||
3529d8c2 | 3686 | static int io_prep_fsync(struct io_kiocb *req, const struct io_uring_sqe *sqe) |
c992fe29 | 3687 | { |
6b06314c | 3688 | struct io_ring_ctx *ctx = req->ctx; |
c992fe29 | 3689 | |
09bb8394 JA |
3690 | if (!req->file) |
3691 | return -EBADF; | |
c992fe29 | 3692 | |
6b06314c | 3693 | if (unlikely(ctx->flags & IORING_SETUP_IOPOLL)) |
def596e9 | 3694 | return -EINVAL; |
edafccee | 3695 | if (unlikely(sqe->addr || sqe->ioprio || sqe->buf_index)) |
c992fe29 CH |
3696 | return -EINVAL; |
3697 | ||
8ed8d3c3 JA |
3698 | req->sync.flags = READ_ONCE(sqe->fsync_flags); |
3699 | if (unlikely(req->sync.flags & ~IORING_FSYNC_DATASYNC)) | |
3700 | return -EINVAL; | |
3701 | ||
3702 | req->sync.off = READ_ONCE(sqe->off); | |
3703 | req->sync.len = READ_ONCE(sqe->len); | |
c992fe29 CH |
3704 | return 0; |
3705 | } | |
3706 | ||
ac45abc0 | 3707 | static int io_fsync(struct io_kiocb *req, bool force_nonblock) |
8ed8d3c3 | 3708 | { |
8ed8d3c3 | 3709 | loff_t end = req->sync.off + req->sync.len; |
8ed8d3c3 JA |
3710 | int ret; |
3711 | ||
ac45abc0 PB |
3712 | /* fsync always requires a blocking context */ |
3713 | if (force_nonblock) | |
3714 | return -EAGAIN; | |
3715 | ||
9adbd45d | 3716 | ret = vfs_fsync_range(req->file, req->sync.off, |
8ed8d3c3 JA |
3717 | end > 0 ? end : LLONG_MAX, |
3718 | req->sync.flags & IORING_FSYNC_DATASYNC); | |
3719 | if (ret < 0) | |
3720 | req_set_fail_links(req); | |
e1e16097 | 3721 | io_req_complete(req, ret); |
c992fe29 CH |
3722 | return 0; |
3723 | } | |
3724 | ||
d63d1b5e JA |
3725 | static int io_fallocate_prep(struct io_kiocb *req, |
3726 | const struct io_uring_sqe *sqe) | |
3727 | { | |
3728 | if (sqe->ioprio || sqe->buf_index || sqe->rw_flags) | |
3729 | return -EINVAL; | |
3232dd02 PB |
3730 | if (unlikely(req->ctx->flags & IORING_SETUP_IOPOLL)) |
3731 | return -EINVAL; | |
d63d1b5e JA |
3732 | |
3733 | req->sync.off = READ_ONCE(sqe->off); | |
3734 | req->sync.len = READ_ONCE(sqe->addr); | |
3735 | req->sync.mode = READ_ONCE(sqe->len); | |
3736 | return 0; | |
3737 | } | |
3738 | ||
014db007 | 3739 | static int io_fallocate(struct io_kiocb *req, bool force_nonblock) |
5d17b4a4 | 3740 | { |
ac45abc0 PB |
3741 | int ret; |
3742 | ||
d63d1b5e | 3743 | /* fallocate always requiring blocking context */ |
ac45abc0 | 3744 | if (force_nonblock) |
5d17b4a4 | 3745 | return -EAGAIN; |
ac45abc0 PB |
3746 | ret = vfs_fallocate(req->file, req->sync.mode, req->sync.off, |
3747 | req->sync.len); | |
ac45abc0 PB |
3748 | if (ret < 0) |
3749 | req_set_fail_links(req); | |
e1e16097 | 3750 | io_req_complete(req, ret); |
5d17b4a4 JA |
3751 | return 0; |
3752 | } | |
3753 | ||
ec65fea5 | 3754 | static int __io_openat_prep(struct io_kiocb *req, const struct io_uring_sqe *sqe) |
b7bb4f7d | 3755 | { |
f8748881 | 3756 | const char __user *fname; |
15b71abe | 3757 | int ret; |
b7bb4f7d | 3758 | |
ec65fea5 | 3759 | if (unlikely(sqe->ioprio || sqe->buf_index)) |
15b71abe | 3760 | return -EINVAL; |
ec65fea5 | 3761 | if (unlikely(req->flags & REQ_F_FIXED_FILE)) |
cf3040ca | 3762 | return -EBADF; |
03b1230c | 3763 | |
ec65fea5 PB |
3764 | /* open.how should be already initialised */ |
3765 | if (!(req->open.how.flags & O_PATH) && force_o_largefile()) | |
08a1d26e | 3766 | req->open.how.flags |= O_LARGEFILE; |
3529d8c2 | 3767 | |
25e72d10 PB |
3768 | req->open.dfd = READ_ONCE(sqe->fd); |
3769 | fname = u64_to_user_ptr(READ_ONCE(sqe->addr)); | |
f8748881 | 3770 | req->open.filename = getname(fname); |
15b71abe JA |
3771 | if (IS_ERR(req->open.filename)) { |
3772 | ret = PTR_ERR(req->open.filename); | |
3773 | req->open.filename = NULL; | |
3774 | return ret; | |
3775 | } | |
4022e7af | 3776 | req->open.nofile = rlimit(RLIMIT_NOFILE); |
8fef80bf | 3777 | req->flags |= REQ_F_NEED_CLEANUP; |
15b71abe | 3778 | return 0; |
03b1230c JA |
3779 | } |
3780 | ||
ec65fea5 PB |
3781 | static int io_openat_prep(struct io_kiocb *req, const struct io_uring_sqe *sqe) |
3782 | { | |
3783 | u64 flags, mode; | |
3784 | ||
4eb8dded JA |
3785 | if (unlikely(req->ctx->flags & (IORING_SETUP_IOPOLL|IORING_SETUP_SQPOLL))) |
3786 | return -EINVAL; | |
ec65fea5 PB |
3787 | mode = READ_ONCE(sqe->len); |
3788 | flags = READ_ONCE(sqe->open_flags); | |
3789 | req->open.how = build_open_how(flags, mode); | |
3790 | return __io_openat_prep(req, sqe); | |
3791 | } | |
3792 | ||
cebdb986 | 3793 | static int io_openat2_prep(struct io_kiocb *req, const struct io_uring_sqe *sqe) |
aa1fa28f | 3794 | { |
cebdb986 | 3795 | struct open_how __user *how; |
cebdb986 | 3796 | size_t len; |
0fa03c62 JA |
3797 | int ret; |
3798 | ||
4eb8dded JA |
3799 | if (unlikely(req->ctx->flags & (IORING_SETUP_IOPOLL|IORING_SETUP_SQPOLL))) |
3800 | return -EINVAL; | |
cebdb986 JA |
3801 | how = u64_to_user_ptr(READ_ONCE(sqe->addr2)); |
3802 | len = READ_ONCE(sqe->len); | |
cebdb986 JA |
3803 | if (len < OPEN_HOW_SIZE_VER0) |
3804 | return -EINVAL; | |
3529d8c2 | 3805 | |
cebdb986 JA |
3806 | ret = copy_struct_from_user(&req->open.how, sizeof(req->open.how), how, |
3807 | len); | |
3808 | if (ret) | |
3809 | return ret; | |
3529d8c2 | 3810 | |
ec65fea5 | 3811 | return __io_openat_prep(req, sqe); |
cebdb986 JA |
3812 | } |
3813 | ||
014db007 | 3814 | static int io_openat2(struct io_kiocb *req, bool force_nonblock) |
15b71abe JA |
3815 | { |
3816 | struct open_flags op; | |
15b71abe JA |
3817 | struct file *file; |
3818 | int ret; | |
3819 | ||
f86cd20c | 3820 | if (force_nonblock) |
15b71abe | 3821 | return -EAGAIN; |
15b71abe | 3822 | |
cebdb986 | 3823 | ret = build_open_flags(&req->open.how, &op); |
15b71abe JA |
3824 | if (ret) |
3825 | goto err; | |
3826 | ||
4022e7af | 3827 | ret = __get_unused_fd_flags(req->open.how.flags, req->open.nofile); |
15b71abe JA |
3828 | if (ret < 0) |
3829 | goto err; | |
3830 | ||
3831 | file = do_filp_open(req->open.dfd, req->open.filename, &op); | |
3832 | if (IS_ERR(file)) { | |
3833 | put_unused_fd(ret); | |
3834 | ret = PTR_ERR(file); | |
3835 | } else { | |
3836 | fsnotify_open(file); | |
3837 | fd_install(ret, file); | |
3838 | } | |
3839 | err: | |
3840 | putname(req->open.filename); | |
8fef80bf | 3841 | req->flags &= ~REQ_F_NEED_CLEANUP; |
15b71abe JA |
3842 | if (ret < 0) |
3843 | req_set_fail_links(req); | |
e1e16097 | 3844 | io_req_complete(req, ret); |
15b71abe JA |
3845 | return 0; |
3846 | } | |
3847 | ||
014db007 | 3848 | static int io_openat(struct io_kiocb *req, bool force_nonblock) |
cebdb986 | 3849 | { |
014db007 | 3850 | return io_openat2(req, force_nonblock); |
cebdb986 JA |
3851 | } |
3852 | ||
067524e9 JA |
3853 | static int io_remove_buffers_prep(struct io_kiocb *req, |
3854 | const struct io_uring_sqe *sqe) | |
3855 | { | |
3856 | struct io_provide_buf *p = &req->pbuf; | |
3857 | u64 tmp; | |
3858 | ||
3859 | if (sqe->ioprio || sqe->rw_flags || sqe->addr || sqe->len || sqe->off) | |
3860 | return -EINVAL; | |
3861 | ||
3862 | tmp = READ_ONCE(sqe->fd); | |
3863 | if (!tmp || tmp > USHRT_MAX) | |
3864 | return -EINVAL; | |
3865 | ||
3866 | memset(p, 0, sizeof(*p)); | |
3867 | p->nbufs = tmp; | |
3868 | p->bgid = READ_ONCE(sqe->buf_group); | |
3869 | return 0; | |
3870 | } | |
3871 | ||
3872 | static int __io_remove_buffers(struct io_ring_ctx *ctx, struct io_buffer *buf, | |
3873 | int bgid, unsigned nbufs) | |
3874 | { | |
3875 | unsigned i = 0; | |
3876 | ||
3877 | /* shouldn't happen */ | |
3878 | if (!nbufs) | |
3879 | return 0; | |
3880 | ||
3881 | /* the head kbuf is the list itself */ | |
3882 | while (!list_empty(&buf->list)) { | |
3883 | struct io_buffer *nxt; | |
3884 | ||
3885 | nxt = list_first_entry(&buf->list, struct io_buffer, list); | |
3886 | list_del(&nxt->list); | |
3887 | kfree(nxt); | |
3888 | if (++i == nbufs) | |
3889 | return i; | |
3890 | } | |
3891 | i++; | |
3892 | kfree(buf); | |
3893 | idr_remove(&ctx->io_buffer_idr, bgid); | |
3894 | ||
3895 | return i; | |
3896 | } | |
3897 | ||
229a7b63 JA |
3898 | static int io_remove_buffers(struct io_kiocb *req, bool force_nonblock, |
3899 | struct io_comp_state *cs) | |
067524e9 JA |
3900 | { |
3901 | struct io_provide_buf *p = &req->pbuf; | |
3902 | struct io_ring_ctx *ctx = req->ctx; | |
3903 | struct io_buffer *head; | |
3904 | int ret = 0; | |
3905 | ||
3906 | io_ring_submit_lock(ctx, !force_nonblock); | |
3907 | ||
3908 | lockdep_assert_held(&ctx->uring_lock); | |
3909 | ||
3910 | ret = -ENOENT; | |
3911 | head = idr_find(&ctx->io_buffer_idr, p->bgid); | |
3912 | if (head) | |
3913 | ret = __io_remove_buffers(ctx, head, p->bgid, p->nbufs); | |
3914 | ||
3915 | io_ring_submit_lock(ctx, !force_nonblock); | |
3916 | if (ret < 0) | |
3917 | req_set_fail_links(req); | |
229a7b63 | 3918 | __io_req_complete(req, ret, 0, cs); |
067524e9 JA |
3919 | return 0; |
3920 | } | |
3921 | ||
ddf0322d JA |
3922 | static int io_provide_buffers_prep(struct io_kiocb *req, |
3923 | const struct io_uring_sqe *sqe) | |
3924 | { | |
3925 | struct io_provide_buf *p = &req->pbuf; | |
3926 | u64 tmp; | |
3927 | ||
3928 | if (sqe->ioprio || sqe->rw_flags) | |
3929 | return -EINVAL; | |
3930 | ||
3931 | tmp = READ_ONCE(sqe->fd); | |
3932 | if (!tmp || tmp > USHRT_MAX) | |
3933 | return -E2BIG; | |
3934 | p->nbufs = tmp; | |
3935 | p->addr = READ_ONCE(sqe->addr); | |
3936 | p->len = READ_ONCE(sqe->len); | |
3937 | ||
efe68c1c | 3938 | if (!access_ok(u64_to_user_ptr(p->addr), (p->len * p->nbufs))) |
ddf0322d JA |
3939 | return -EFAULT; |
3940 | ||
3941 | p->bgid = READ_ONCE(sqe->buf_group); | |
3942 | tmp = READ_ONCE(sqe->off); | |
3943 | if (tmp > USHRT_MAX) | |
3944 | return -E2BIG; | |
3945 | p->bid = tmp; | |
3946 | return 0; | |
3947 | } | |
3948 | ||
3949 | static int io_add_buffers(struct io_provide_buf *pbuf, struct io_buffer **head) | |
3950 | { | |
3951 | struct io_buffer *buf; | |
3952 | u64 addr = pbuf->addr; | |
3953 | int i, bid = pbuf->bid; | |
3954 | ||
3955 | for (i = 0; i < pbuf->nbufs; i++) { | |
3956 | buf = kmalloc(sizeof(*buf), GFP_KERNEL); | |
3957 | if (!buf) | |
3958 | break; | |
3959 | ||
3960 | buf->addr = addr; | |
3961 | buf->len = pbuf->len; | |
3962 | buf->bid = bid; | |
3963 | addr += pbuf->len; | |
3964 | bid++; | |
3965 | if (!*head) { | |
3966 | INIT_LIST_HEAD(&buf->list); | |
3967 | *head = buf; | |
3968 | } else { | |
3969 | list_add_tail(&buf->list, &(*head)->list); | |
3970 | } | |
3971 | } | |
3972 | ||
3973 | return i ? i : -ENOMEM; | |
3974 | } | |
3975 | ||
229a7b63 JA |
3976 | static int io_provide_buffers(struct io_kiocb *req, bool force_nonblock, |
3977 | struct io_comp_state *cs) | |
ddf0322d JA |
3978 | { |
3979 | struct io_provide_buf *p = &req->pbuf; | |
3980 | struct io_ring_ctx *ctx = req->ctx; | |
3981 | struct io_buffer *head, *list; | |
3982 | int ret = 0; | |
3983 | ||
3984 | io_ring_submit_lock(ctx, !force_nonblock); | |
3985 | ||
3986 | lockdep_assert_held(&ctx->uring_lock); | |
3987 | ||
3988 | list = head = idr_find(&ctx->io_buffer_idr, p->bgid); | |
3989 | ||
3990 | ret = io_add_buffers(p, &head); | |
3991 | if (ret < 0) | |
3992 | goto out; | |
3993 | ||
3994 | if (!list) { | |
3995 | ret = idr_alloc(&ctx->io_buffer_idr, head, p->bgid, p->bgid + 1, | |
3996 | GFP_KERNEL); | |
3997 | if (ret < 0) { | |
067524e9 | 3998 | __io_remove_buffers(ctx, head, p->bgid, -1U); |
ddf0322d JA |
3999 | goto out; |
4000 | } | |
4001 | } | |
4002 | out: | |
4003 | io_ring_submit_unlock(ctx, !force_nonblock); | |
4004 | if (ret < 0) | |
4005 | req_set_fail_links(req); | |
229a7b63 | 4006 | __io_req_complete(req, ret, 0, cs); |
ddf0322d | 4007 | return 0; |
cebdb986 JA |
4008 | } |
4009 | ||
3e4827b0 JA |
4010 | static int io_epoll_ctl_prep(struct io_kiocb *req, |
4011 | const struct io_uring_sqe *sqe) | |
4012 | { | |
4013 | #if defined(CONFIG_EPOLL) | |
4014 | if (sqe->ioprio || sqe->buf_index) | |
4015 | return -EINVAL; | |
6ca56f84 | 4016 | if (unlikely(req->ctx->flags & (IORING_SETUP_IOPOLL | IORING_SETUP_SQPOLL))) |
3232dd02 | 4017 | return -EINVAL; |
3e4827b0 JA |
4018 | |
4019 | req->epoll.epfd = READ_ONCE(sqe->fd); | |
4020 | req->epoll.op = READ_ONCE(sqe->len); | |
4021 | req->epoll.fd = READ_ONCE(sqe->off); | |
4022 | ||
4023 | if (ep_op_has_event(req->epoll.op)) { | |
4024 | struct epoll_event __user *ev; | |
4025 | ||
4026 | ev = u64_to_user_ptr(READ_ONCE(sqe->addr)); | |
4027 | if (copy_from_user(&req->epoll.event, ev, sizeof(*ev))) | |
4028 | return -EFAULT; | |
4029 | } | |
4030 | ||
4031 | return 0; | |
4032 | #else | |
4033 | return -EOPNOTSUPP; | |
4034 | #endif | |
4035 | } | |
4036 | ||
229a7b63 JA |
4037 | static int io_epoll_ctl(struct io_kiocb *req, bool force_nonblock, |
4038 | struct io_comp_state *cs) | |
3e4827b0 JA |
4039 | { |
4040 | #if defined(CONFIG_EPOLL) | |
4041 | struct io_epoll *ie = &req->epoll; | |
4042 | int ret; | |
4043 | ||
4044 | ret = do_epoll_ctl(ie->epfd, ie->op, ie->fd, &ie->event, force_nonblock); | |
4045 | if (force_nonblock && ret == -EAGAIN) | |
4046 | return -EAGAIN; | |
4047 | ||
4048 | if (ret < 0) | |
4049 | req_set_fail_links(req); | |
229a7b63 | 4050 | __io_req_complete(req, ret, 0, cs); |
3e4827b0 JA |
4051 | return 0; |
4052 | #else | |
4053 | return -EOPNOTSUPP; | |
4054 | #endif | |
4055 | } | |
4056 | ||
c1ca757b JA |
4057 | static int io_madvise_prep(struct io_kiocb *req, const struct io_uring_sqe *sqe) |
4058 | { | |
4059 | #if defined(CONFIG_ADVISE_SYSCALLS) && defined(CONFIG_MMU) | |
4060 | if (sqe->ioprio || sqe->buf_index || sqe->off) | |
4061 | return -EINVAL; | |
3232dd02 PB |
4062 | if (unlikely(req->ctx->flags & IORING_SETUP_IOPOLL)) |
4063 | return -EINVAL; | |
c1ca757b JA |
4064 | |
4065 | req->madvise.addr = READ_ONCE(sqe->addr); | |
4066 | req->madvise.len = READ_ONCE(sqe->len); | |
4067 | req->madvise.advice = READ_ONCE(sqe->fadvise_advice); | |
4068 | return 0; | |
4069 | #else | |
4070 | return -EOPNOTSUPP; | |
4071 | #endif | |
4072 | } | |
4073 | ||
014db007 | 4074 | static int io_madvise(struct io_kiocb *req, bool force_nonblock) |
c1ca757b JA |
4075 | { |
4076 | #if defined(CONFIG_ADVISE_SYSCALLS) && defined(CONFIG_MMU) | |
4077 | struct io_madvise *ma = &req->madvise; | |
4078 | int ret; | |
4079 | ||
4080 | if (force_nonblock) | |
4081 | return -EAGAIN; | |
4082 | ||
4083 | ret = do_madvise(ma->addr, ma->len, ma->advice); | |
4084 | if (ret < 0) | |
4085 | req_set_fail_links(req); | |
e1e16097 | 4086 | io_req_complete(req, ret); |
c1ca757b JA |
4087 | return 0; |
4088 | #else | |
4089 | return -EOPNOTSUPP; | |
4090 | #endif | |
4091 | } | |
4092 | ||
4840e418 JA |
4093 | static int io_fadvise_prep(struct io_kiocb *req, const struct io_uring_sqe *sqe) |
4094 | { | |
4095 | if (sqe->ioprio || sqe->buf_index || sqe->addr) | |
4096 | return -EINVAL; | |
3232dd02 PB |
4097 | if (unlikely(req->ctx->flags & IORING_SETUP_IOPOLL)) |
4098 | return -EINVAL; | |
4840e418 JA |
4099 | |
4100 | req->fadvise.offset = READ_ONCE(sqe->off); | |
4101 | req->fadvise.len = READ_ONCE(sqe->len); | |
4102 | req->fadvise.advice = READ_ONCE(sqe->fadvise_advice); | |
4103 | return 0; | |
4104 | } | |
4105 | ||
014db007 | 4106 | static int io_fadvise(struct io_kiocb *req, bool force_nonblock) |
4840e418 JA |
4107 | { |
4108 | struct io_fadvise *fa = &req->fadvise; | |
4109 | int ret; | |
4110 | ||
3e69426d JA |
4111 | if (force_nonblock) { |
4112 | switch (fa->advice) { | |
4113 | case POSIX_FADV_NORMAL: | |
4114 | case POSIX_FADV_RANDOM: | |
4115 | case POSIX_FADV_SEQUENTIAL: | |
4116 | break; | |
4117 | default: | |
4118 | return -EAGAIN; | |
4119 | } | |
4120 | } | |
4840e418 JA |
4121 | |
4122 | ret = vfs_fadvise(req->file, fa->offset, fa->len, fa->advice); | |
4123 | if (ret < 0) | |
4124 | req_set_fail_links(req); | |
e1e16097 | 4125 | io_req_complete(req, ret); |
4840e418 JA |
4126 | return 0; |
4127 | } | |
4128 | ||
eddc7ef5 JA |
4129 | static int io_statx_prep(struct io_kiocb *req, const struct io_uring_sqe *sqe) |
4130 | { | |
6ca56f84 | 4131 | if (unlikely(req->ctx->flags & (IORING_SETUP_IOPOLL | IORING_SETUP_SQPOLL))) |
3232dd02 | 4132 | return -EINVAL; |
eddc7ef5 JA |
4133 | if (sqe->ioprio || sqe->buf_index) |
4134 | return -EINVAL; | |
9c280f90 | 4135 | if (req->flags & REQ_F_FIXED_FILE) |
cf3040ca | 4136 | return -EBADF; |
eddc7ef5 | 4137 | |
1d9e1288 BM |
4138 | req->statx.dfd = READ_ONCE(sqe->fd); |
4139 | req->statx.mask = READ_ONCE(sqe->len); | |
e62753e4 | 4140 | req->statx.filename = u64_to_user_ptr(READ_ONCE(sqe->addr)); |
1d9e1288 BM |
4141 | req->statx.buffer = u64_to_user_ptr(READ_ONCE(sqe->addr2)); |
4142 | req->statx.flags = READ_ONCE(sqe->statx_flags); | |
eddc7ef5 JA |
4143 | |
4144 | return 0; | |
4145 | } | |
4146 | ||
014db007 | 4147 | static int io_statx(struct io_kiocb *req, bool force_nonblock) |
eddc7ef5 | 4148 | { |
1d9e1288 | 4149 | struct io_statx *ctx = &req->statx; |
eddc7ef5 JA |
4150 | int ret; |
4151 | ||
5b0bbee4 JA |
4152 | if (force_nonblock) { |
4153 | /* only need file table for an actual valid fd */ | |
4154 | if (ctx->dfd == -1 || ctx->dfd == AT_FDCWD) | |
4155 | req->flags |= REQ_F_NO_FILE_TABLE; | |
eddc7ef5 | 4156 | return -EAGAIN; |
5b0bbee4 | 4157 | } |
eddc7ef5 | 4158 | |
e62753e4 BM |
4159 | ret = do_statx(ctx->dfd, ctx->filename, ctx->flags, ctx->mask, |
4160 | ctx->buffer); | |
eddc7ef5 | 4161 | |
eddc7ef5 JA |
4162 | if (ret < 0) |
4163 | req_set_fail_links(req); | |
e1e16097 | 4164 | io_req_complete(req, ret); |
eddc7ef5 JA |
4165 | return 0; |
4166 | } | |
4167 | ||
b5dba59e JA |
4168 | static int io_close_prep(struct io_kiocb *req, const struct io_uring_sqe *sqe) |
4169 | { | |
4170 | /* | |
4171 | * If we queue this for async, it must not be cancellable. That would | |
7cdaf587 XW |
4172 | * leave the 'file' in an undeterminate state, and here need to modify |
4173 | * io_wq_work.flags, so initialize io_wq_work firstly. | |
b5dba59e | 4174 | */ |
7cdaf587 | 4175 | io_req_init_async(req); |
b5dba59e JA |
4176 | req->work.flags |= IO_WQ_WORK_NO_CANCEL; |
4177 | ||
3232dd02 PB |
4178 | if (unlikely(req->ctx->flags & (IORING_SETUP_IOPOLL|IORING_SETUP_SQPOLL))) |
4179 | return -EINVAL; | |
b5dba59e JA |
4180 | if (sqe->ioprio || sqe->off || sqe->addr || sqe->len || |
4181 | sqe->rw_flags || sqe->buf_index) | |
4182 | return -EINVAL; | |
9c280f90 | 4183 | if (req->flags & REQ_F_FIXED_FILE) |
cf3040ca | 4184 | return -EBADF; |
b5dba59e JA |
4185 | |
4186 | req->close.fd = READ_ONCE(sqe->fd); | |
0f212204 | 4187 | if ((req->file && req->file->f_op == &io_uring_fops)) |
fd2206e4 | 4188 | return -EBADF; |
b5dba59e | 4189 | |
3af73b28 | 4190 | req->close.put_file = NULL; |
b5dba59e | 4191 | return 0; |
b5dba59e JA |
4192 | } |
4193 | ||
229a7b63 JA |
4194 | static int io_close(struct io_kiocb *req, bool force_nonblock, |
4195 | struct io_comp_state *cs) | |
b5dba59e | 4196 | { |
3af73b28 | 4197 | struct io_close *close = &req->close; |
b5dba59e JA |
4198 | int ret; |
4199 | ||
3af73b28 PB |
4200 | /* might be already done during nonblock submission */ |
4201 | if (!close->put_file) { | |
4202 | ret = __close_fd_get_file(close->fd, &close->put_file); | |
4203 | if (ret < 0) | |
4204 | return (ret == -ENOENT) ? -EBADF : ret; | |
4205 | } | |
b5dba59e JA |
4206 | |
4207 | /* if the file has a flush method, be safe and punt to async */ | |
3af73b28 | 4208 | if (close->put_file->f_op->flush && force_nonblock) { |
24c74678 PB |
4209 | /* was never set, but play safe */ |
4210 | req->flags &= ~REQ_F_NOWAIT; | |
0bf0eefd | 4211 | /* avoid grabbing files - we don't need the files */ |
24c74678 | 4212 | req->flags |= REQ_F_NO_FILE_TABLE; |
0bf0eefd | 4213 | return -EAGAIN; |
a2100672 | 4214 | } |
b5dba59e | 4215 | |
3af73b28 | 4216 | /* No ->flush() or already async, safely close from here */ |
98447d65 | 4217 | ret = filp_close(close->put_file, req->work.identity->files); |
3af73b28 PB |
4218 | if (ret < 0) |
4219 | req_set_fail_links(req); | |
3af73b28 PB |
4220 | fput(close->put_file); |
4221 | close->put_file = NULL; | |
229a7b63 | 4222 | __io_req_complete(req, ret, 0, cs); |
1a417f4e | 4223 | return 0; |
b5dba59e JA |
4224 | } |
4225 | ||
3529d8c2 | 4226 | static int io_prep_sfr(struct io_kiocb *req, const struct io_uring_sqe *sqe) |
5d17b4a4 JA |
4227 | { |
4228 | struct io_ring_ctx *ctx = req->ctx; | |
5d17b4a4 JA |
4229 | |
4230 | if (!req->file) | |
4231 | return -EBADF; | |
5d17b4a4 JA |
4232 | |
4233 | if (unlikely(ctx->flags & IORING_SETUP_IOPOLL)) | |
4234 | return -EINVAL; | |
4235 | if (unlikely(sqe->addr || sqe->ioprio || sqe->buf_index)) | |
4236 | return -EINVAL; | |
4237 | ||
8ed8d3c3 JA |
4238 | req->sync.off = READ_ONCE(sqe->off); |
4239 | req->sync.len = READ_ONCE(sqe->len); | |
4240 | req->sync.flags = READ_ONCE(sqe->sync_range_flags); | |
8ed8d3c3 JA |
4241 | return 0; |
4242 | } | |
4243 | ||
ac45abc0 | 4244 | static int io_sync_file_range(struct io_kiocb *req, bool force_nonblock) |
8ed8d3c3 | 4245 | { |
8ed8d3c3 JA |
4246 | int ret; |
4247 | ||
ac45abc0 PB |
4248 | /* sync_file_range always requires a blocking context */ |
4249 | if (force_nonblock) | |
4250 | return -EAGAIN; | |
4251 | ||
9adbd45d | 4252 | ret = sync_file_range(req->file, req->sync.off, req->sync.len, |
8ed8d3c3 JA |
4253 | req->sync.flags); |
4254 | if (ret < 0) | |
4255 | req_set_fail_links(req); | |
e1e16097 | 4256 | io_req_complete(req, ret); |
5d17b4a4 JA |
4257 | return 0; |
4258 | } | |
4259 | ||
469956e8 | 4260 | #if defined(CONFIG_NET) |
02d27d89 PB |
4261 | static int io_setup_async_msg(struct io_kiocb *req, |
4262 | struct io_async_msghdr *kmsg) | |
4263 | { | |
e8c2bc1f JA |
4264 | struct io_async_msghdr *async_msg = req->async_data; |
4265 | ||
4266 | if (async_msg) | |
02d27d89 | 4267 | return -EAGAIN; |
e8c2bc1f | 4268 | if (io_alloc_async_data(req)) { |
02d27d89 PB |
4269 | if (kmsg->iov != kmsg->fast_iov) |
4270 | kfree(kmsg->iov); | |
4271 | return -ENOMEM; | |
4272 | } | |
e8c2bc1f | 4273 | async_msg = req->async_data; |
02d27d89 | 4274 | req->flags |= REQ_F_NEED_CLEANUP; |
e8c2bc1f | 4275 | memcpy(async_msg, kmsg, sizeof(*kmsg)); |
02d27d89 PB |
4276 | return -EAGAIN; |
4277 | } | |
4278 | ||
2ae523ed PB |
4279 | static int io_sendmsg_copy_hdr(struct io_kiocb *req, |
4280 | struct io_async_msghdr *iomsg) | |
4281 | { | |
4282 | iomsg->iov = iomsg->fast_iov; | |
4283 | iomsg->msg.msg_name = &iomsg->addr; | |
4284 | return sendmsg_copy_msghdr(&iomsg->msg, req->sr_msg.umsg, | |
4285 | req->sr_msg.msg_flags, &iomsg->iov); | |
4286 | } | |
4287 | ||
3529d8c2 | 4288 | static int io_sendmsg_prep(struct io_kiocb *req, const struct io_uring_sqe *sqe) |
03b1230c | 4289 | { |
e8c2bc1f | 4290 | struct io_async_msghdr *async_msg = req->async_data; |
e47293fd | 4291 | struct io_sr_msg *sr = &req->sr_msg; |
99bc4c38 | 4292 | int ret; |
03b1230c | 4293 | |
d2b6f48b PB |
4294 | if (unlikely(req->ctx->flags & IORING_SETUP_IOPOLL)) |
4295 | return -EINVAL; | |
4296 | ||
e47293fd | 4297 | sr->msg_flags = READ_ONCE(sqe->msg_flags); |
270a5940 | 4298 | sr->umsg = u64_to_user_ptr(READ_ONCE(sqe->addr)); |
fddaface | 4299 | sr->len = READ_ONCE(sqe->len); |
3529d8c2 | 4300 | |
d8768362 JA |
4301 | #ifdef CONFIG_COMPAT |
4302 | if (req->ctx->compat) | |
4303 | sr->msg_flags |= MSG_CMSG_COMPAT; | |
4304 | #endif | |
4305 | ||
e8c2bc1f | 4306 | if (!async_msg || !io_op_defs[req->opcode].needs_async_data) |
3529d8c2 | 4307 | return 0; |
e8c2bc1f | 4308 | ret = io_sendmsg_copy_hdr(req, async_msg); |
99bc4c38 PB |
4309 | if (!ret) |
4310 | req->flags |= REQ_F_NEED_CLEANUP; | |
4311 | return ret; | |
03b1230c JA |
4312 | } |
4313 | ||
229a7b63 JA |
4314 | static int io_sendmsg(struct io_kiocb *req, bool force_nonblock, |
4315 | struct io_comp_state *cs) | |
aa1fa28f | 4316 | { |
6b754c8b | 4317 | struct io_async_msghdr iomsg, *kmsg; |
0fa03c62 | 4318 | struct socket *sock; |
7a7cacba | 4319 | unsigned flags; |
0fa03c62 JA |
4320 | int ret; |
4321 | ||
0fa03c62 | 4322 | sock = sock_from_file(req->file, &ret); |
7a7cacba PB |
4323 | if (unlikely(!sock)) |
4324 | return ret; | |
3529d8c2 | 4325 | |
e8c2bc1f JA |
4326 | if (req->async_data) { |
4327 | kmsg = req->async_data; | |
4328 | kmsg->msg.msg_name = &kmsg->addr; | |
7a7cacba PB |
4329 | /* if iov is set, it's allocated already */ |
4330 | if (!kmsg->iov) | |
4331 | kmsg->iov = kmsg->fast_iov; | |
4332 | kmsg->msg.msg_iter.iov = kmsg->iov; | |
4333 | } else { | |
4334 | ret = io_sendmsg_copy_hdr(req, &iomsg); | |
4335 | if (ret) | |
4336 | return ret; | |
4337 | kmsg = &iomsg; | |
0fa03c62 | 4338 | } |
0fa03c62 | 4339 | |
7a7cacba PB |
4340 | flags = req->sr_msg.msg_flags; |
4341 | if (flags & MSG_DONTWAIT) | |
4342 | req->flags |= REQ_F_NOWAIT; | |
4343 | else if (force_nonblock) | |
4344 | flags |= MSG_DONTWAIT; | |
e47293fd | 4345 | |
7a7cacba PB |
4346 | ret = __sys_sendmsg_sock(sock, &kmsg->msg, flags); |
4347 | if (force_nonblock && ret == -EAGAIN) | |
4348 | return io_setup_async_msg(req, kmsg); | |
4349 | if (ret == -ERESTARTSYS) | |
4350 | ret = -EINTR; | |
0fa03c62 | 4351 | |
6b754c8b | 4352 | if (kmsg->iov != kmsg->fast_iov) |
0b416c3e | 4353 | kfree(kmsg->iov); |
99bc4c38 | 4354 | req->flags &= ~REQ_F_NEED_CLEANUP; |
4e88d6e7 JA |
4355 | if (ret < 0) |
4356 | req_set_fail_links(req); | |
229a7b63 | 4357 | __io_req_complete(req, ret, 0, cs); |
5d17b4a4 | 4358 | return 0; |
03b1230c | 4359 | } |
aa1fa28f | 4360 | |
229a7b63 JA |
4361 | static int io_send(struct io_kiocb *req, bool force_nonblock, |
4362 | struct io_comp_state *cs) | |
fddaface | 4363 | { |
7a7cacba PB |
4364 | struct io_sr_msg *sr = &req->sr_msg; |
4365 | struct msghdr msg; | |
4366 | struct iovec iov; | |
fddaface | 4367 | struct socket *sock; |
7a7cacba | 4368 | unsigned flags; |
fddaface JA |
4369 | int ret; |
4370 | ||
fddaface | 4371 | sock = sock_from_file(req->file, &ret); |
7a7cacba PB |
4372 | if (unlikely(!sock)) |
4373 | return ret; | |
fddaface | 4374 | |
7a7cacba PB |
4375 | ret = import_single_range(WRITE, sr->buf, sr->len, &iov, &msg.msg_iter); |
4376 | if (unlikely(ret)) | |
14db8411 | 4377 | return ret; |
fddaface | 4378 | |
7a7cacba PB |
4379 | msg.msg_name = NULL; |
4380 | msg.msg_control = NULL; | |
4381 | msg.msg_controllen = 0; | |
4382 | msg.msg_namelen = 0; | |
fddaface | 4383 | |
7a7cacba PB |
4384 | flags = req->sr_msg.msg_flags; |
4385 | if (flags & MSG_DONTWAIT) | |
4386 | req->flags |= REQ_F_NOWAIT; | |
4387 | else if (force_nonblock) | |
4388 | flags |= MSG_DONTWAIT; | |
fddaface | 4389 | |
7a7cacba PB |
4390 | msg.msg_flags = flags; |
4391 | ret = sock_sendmsg(sock, &msg); | |
4392 | if (force_nonblock && ret == -EAGAIN) | |
4393 | return -EAGAIN; | |
4394 | if (ret == -ERESTARTSYS) | |
4395 | ret = -EINTR; | |
fddaface | 4396 | |
fddaface JA |
4397 | if (ret < 0) |
4398 | req_set_fail_links(req); | |
229a7b63 | 4399 | __io_req_complete(req, ret, 0, cs); |
fddaface | 4400 | return 0; |
fddaface JA |
4401 | } |
4402 | ||
1400e697 PB |
4403 | static int __io_recvmsg_copy_hdr(struct io_kiocb *req, |
4404 | struct io_async_msghdr *iomsg) | |
52de1fe1 JA |
4405 | { |
4406 | struct io_sr_msg *sr = &req->sr_msg; | |
4407 | struct iovec __user *uiov; | |
4408 | size_t iov_len; | |
4409 | int ret; | |
4410 | ||
1400e697 PB |
4411 | ret = __copy_msghdr_from_user(&iomsg->msg, sr->umsg, |
4412 | &iomsg->uaddr, &uiov, &iov_len); | |
52de1fe1 JA |
4413 | if (ret) |
4414 | return ret; | |
4415 | ||
4416 | if (req->flags & REQ_F_BUFFER_SELECT) { | |
4417 | if (iov_len > 1) | |
4418 | return -EINVAL; | |
1400e697 | 4419 | if (copy_from_user(iomsg->iov, uiov, sizeof(*uiov))) |
52de1fe1 | 4420 | return -EFAULT; |
1400e697 PB |
4421 | sr->len = iomsg->iov[0].iov_len; |
4422 | iov_iter_init(&iomsg->msg.msg_iter, READ, iomsg->iov, 1, | |
52de1fe1 | 4423 | sr->len); |
1400e697 | 4424 | iomsg->iov = NULL; |
52de1fe1 | 4425 | } else { |
89cd35c5 CH |
4426 | ret = __import_iovec(READ, uiov, iov_len, UIO_FASTIOV, |
4427 | &iomsg->iov, &iomsg->msg.msg_iter, | |
4428 | false); | |
52de1fe1 JA |
4429 | if (ret > 0) |
4430 | ret = 0; | |
4431 | } | |
4432 | ||
4433 | return ret; | |
4434 | } | |
4435 | ||
4436 | #ifdef CONFIG_COMPAT | |
4437 | static int __io_compat_recvmsg_copy_hdr(struct io_kiocb *req, | |
1400e697 | 4438 | struct io_async_msghdr *iomsg) |
52de1fe1 JA |
4439 | { |
4440 | struct compat_msghdr __user *msg_compat; | |
4441 | struct io_sr_msg *sr = &req->sr_msg; | |
4442 | struct compat_iovec __user *uiov; | |
4443 | compat_uptr_t ptr; | |
4444 | compat_size_t len; | |
4445 | int ret; | |
4446 | ||
270a5940 | 4447 | msg_compat = (struct compat_msghdr __user *) sr->umsg; |
1400e697 | 4448 | ret = __get_compat_msghdr(&iomsg->msg, msg_compat, &iomsg->uaddr, |
52de1fe1 JA |
4449 | &ptr, &len); |
4450 | if (ret) | |
4451 | return ret; | |
4452 | ||
4453 | uiov = compat_ptr(ptr); | |
4454 | if (req->flags & REQ_F_BUFFER_SELECT) { | |
4455 | compat_ssize_t clen; | |
4456 | ||
4457 | if (len > 1) | |
4458 | return -EINVAL; | |
4459 | if (!access_ok(uiov, sizeof(*uiov))) | |
4460 | return -EFAULT; | |
4461 | if (__get_user(clen, &uiov->iov_len)) | |
4462 | return -EFAULT; | |
4463 | if (clen < 0) | |
4464 | return -EINVAL; | |
1400e697 PB |
4465 | sr->len = iomsg->iov[0].iov_len; |
4466 | iomsg->iov = NULL; | |
52de1fe1 | 4467 | } else { |
89cd35c5 CH |
4468 | ret = __import_iovec(READ, (struct iovec __user *)uiov, len, |
4469 | UIO_FASTIOV, &iomsg->iov, | |
4470 | &iomsg->msg.msg_iter, true); | |
52de1fe1 JA |
4471 | if (ret < 0) |
4472 | return ret; | |
4473 | } | |
4474 | ||
4475 | return 0; | |
4476 | } | |
4477 | #endif | |
4478 | ||
1400e697 PB |
4479 | static int io_recvmsg_copy_hdr(struct io_kiocb *req, |
4480 | struct io_async_msghdr *iomsg) | |
52de1fe1 | 4481 | { |
1400e697 PB |
4482 | iomsg->msg.msg_name = &iomsg->addr; |
4483 | iomsg->iov = iomsg->fast_iov; | |
52de1fe1 JA |
4484 | |
4485 | #ifdef CONFIG_COMPAT | |
4486 | if (req->ctx->compat) | |
1400e697 | 4487 | return __io_compat_recvmsg_copy_hdr(req, iomsg); |
fddaface | 4488 | #endif |
52de1fe1 | 4489 | |
1400e697 | 4490 | return __io_recvmsg_copy_hdr(req, iomsg); |
52de1fe1 JA |
4491 | } |
4492 | ||
bcda7baa | 4493 | static struct io_buffer *io_recv_buffer_select(struct io_kiocb *req, |
7fbb1b54 | 4494 | bool needs_lock) |
bcda7baa JA |
4495 | { |
4496 | struct io_sr_msg *sr = &req->sr_msg; | |
4497 | struct io_buffer *kbuf; | |
4498 | ||
bcda7baa JA |
4499 | kbuf = io_buffer_select(req, &sr->len, sr->bgid, sr->kbuf, needs_lock); |
4500 | if (IS_ERR(kbuf)) | |
4501 | return kbuf; | |
4502 | ||
4503 | sr->kbuf = kbuf; | |
4504 | req->flags |= REQ_F_BUFFER_SELECTED; | |
bcda7baa | 4505 | return kbuf; |
fddaface JA |
4506 | } |
4507 | ||
7fbb1b54 PB |
4508 | static inline unsigned int io_put_recv_kbuf(struct io_kiocb *req) |
4509 | { | |
4510 | return io_put_kbuf(req, req->sr_msg.kbuf); | |
4511 | } | |
4512 | ||
3529d8c2 JA |
4513 | static int io_recvmsg_prep(struct io_kiocb *req, |
4514 | const struct io_uring_sqe *sqe) | |
aa1fa28f | 4515 | { |
e8c2bc1f | 4516 | struct io_async_msghdr *async_msg = req->async_data; |
e47293fd | 4517 | struct io_sr_msg *sr = &req->sr_msg; |
99bc4c38 | 4518 | int ret; |
3529d8c2 | 4519 | |
d2b6f48b PB |
4520 | if (unlikely(req->ctx->flags & IORING_SETUP_IOPOLL)) |
4521 | return -EINVAL; | |
4522 | ||
3529d8c2 | 4523 | sr->msg_flags = READ_ONCE(sqe->msg_flags); |
270a5940 | 4524 | sr->umsg = u64_to_user_ptr(READ_ONCE(sqe->addr)); |
0b7b21e4 | 4525 | sr->len = READ_ONCE(sqe->len); |
bcda7baa | 4526 | sr->bgid = READ_ONCE(sqe->buf_group); |
06b76d44 | 4527 | |
d8768362 JA |
4528 | #ifdef CONFIG_COMPAT |
4529 | if (req->ctx->compat) | |
4530 | sr->msg_flags |= MSG_CMSG_COMPAT; | |
4531 | #endif | |
4532 | ||
e8c2bc1f | 4533 | if (!async_msg || !io_op_defs[req->opcode].needs_async_data) |
5f798bea | 4534 | return 0; |
e8c2bc1f | 4535 | ret = io_recvmsg_copy_hdr(req, async_msg); |
99bc4c38 PB |
4536 | if (!ret) |
4537 | req->flags |= REQ_F_NEED_CLEANUP; | |
4538 | return ret; | |
aa1fa28f JA |
4539 | } |
4540 | ||
229a7b63 JA |
4541 | static int io_recvmsg(struct io_kiocb *req, bool force_nonblock, |
4542 | struct io_comp_state *cs) | |
aa1fa28f | 4543 | { |
6b754c8b | 4544 | struct io_async_msghdr iomsg, *kmsg; |
03b1230c | 4545 | struct socket *sock; |
7fbb1b54 | 4546 | struct io_buffer *kbuf; |
7a7cacba | 4547 | unsigned flags; |
52de1fe1 | 4548 | int ret, cflags = 0; |
03b1230c | 4549 | |
03b1230c | 4550 | sock = sock_from_file(req->file, &ret); |
7a7cacba PB |
4551 | if (unlikely(!sock)) |
4552 | return ret; | |
3529d8c2 | 4553 | |
e8c2bc1f JA |
4554 | if (req->async_data) { |
4555 | kmsg = req->async_data; | |
4556 | kmsg->msg.msg_name = &kmsg->addr; | |
7a7cacba PB |
4557 | /* if iov is set, it's allocated already */ |
4558 | if (!kmsg->iov) | |
4559 | kmsg->iov = kmsg->fast_iov; | |
4560 | kmsg->msg.msg_iter.iov = kmsg->iov; | |
4561 | } else { | |
4562 | ret = io_recvmsg_copy_hdr(req, &iomsg); | |
4563 | if (ret) | |
681fda8d | 4564 | return ret; |
7a7cacba PB |
4565 | kmsg = &iomsg; |
4566 | } | |
03b1230c | 4567 | |
bc02ef33 | 4568 | if (req->flags & REQ_F_BUFFER_SELECT) { |
7fbb1b54 | 4569 | kbuf = io_recv_buffer_select(req, !force_nonblock); |
bc02ef33 | 4570 | if (IS_ERR(kbuf)) |
52de1fe1 | 4571 | return PTR_ERR(kbuf); |
7a7cacba PB |
4572 | kmsg->fast_iov[0].iov_base = u64_to_user_ptr(kbuf->addr); |
4573 | iov_iter_init(&kmsg->msg.msg_iter, READ, kmsg->iov, | |
4574 | 1, req->sr_msg.len); | |
4575 | } | |
52de1fe1 | 4576 | |
7a7cacba PB |
4577 | flags = req->sr_msg.msg_flags; |
4578 | if (flags & MSG_DONTWAIT) | |
4579 | req->flags |= REQ_F_NOWAIT; | |
4580 | else if (force_nonblock) | |
4581 | flags |= MSG_DONTWAIT; | |
e47293fd | 4582 | |
7a7cacba PB |
4583 | ret = __sys_recvmsg_sock(sock, &kmsg->msg, req->sr_msg.umsg, |
4584 | kmsg->uaddr, flags); | |
0e1b6fe3 PB |
4585 | if (force_nonblock && ret == -EAGAIN) |
4586 | return io_setup_async_msg(req, kmsg); | |
7a7cacba PB |
4587 | if (ret == -ERESTARTSYS) |
4588 | ret = -EINTR; | |
03b1230c | 4589 | |
7fbb1b54 PB |
4590 | if (req->flags & REQ_F_BUFFER_SELECTED) |
4591 | cflags = io_put_recv_kbuf(req); | |
6b754c8b | 4592 | if (kmsg->iov != kmsg->fast_iov) |
0b416c3e | 4593 | kfree(kmsg->iov); |
99bc4c38 | 4594 | req->flags &= ~REQ_F_NEED_CLEANUP; |
4e88d6e7 JA |
4595 | if (ret < 0) |
4596 | req_set_fail_links(req); | |
229a7b63 | 4597 | __io_req_complete(req, ret, cflags, cs); |
03b1230c | 4598 | return 0; |
0fa03c62 | 4599 | } |
5d17b4a4 | 4600 | |
229a7b63 JA |
4601 | static int io_recv(struct io_kiocb *req, bool force_nonblock, |
4602 | struct io_comp_state *cs) | |
fddaface | 4603 | { |
6b754c8b | 4604 | struct io_buffer *kbuf; |
7a7cacba PB |
4605 | struct io_sr_msg *sr = &req->sr_msg; |
4606 | struct msghdr msg; | |
4607 | void __user *buf = sr->buf; | |
fddaface | 4608 | struct socket *sock; |
7a7cacba PB |
4609 | struct iovec iov; |
4610 | unsigned flags; | |
bcda7baa | 4611 | int ret, cflags = 0; |
fddaface | 4612 | |
fddaface | 4613 | sock = sock_from_file(req->file, &ret); |
7a7cacba PB |
4614 | if (unlikely(!sock)) |
4615 | return ret; | |
fddaface | 4616 | |
bc02ef33 | 4617 | if (req->flags & REQ_F_BUFFER_SELECT) { |
7fbb1b54 | 4618 | kbuf = io_recv_buffer_select(req, !force_nonblock); |
bcda7baa JA |
4619 | if (IS_ERR(kbuf)) |
4620 | return PTR_ERR(kbuf); | |
7a7cacba | 4621 | buf = u64_to_user_ptr(kbuf->addr); |
bc02ef33 | 4622 | } |
bcda7baa | 4623 | |
7a7cacba | 4624 | ret = import_single_range(READ, buf, sr->len, &iov, &msg.msg_iter); |
14c32eee PB |
4625 | if (unlikely(ret)) |
4626 | goto out_free; | |
fddaface | 4627 | |
7a7cacba PB |
4628 | msg.msg_name = NULL; |
4629 | msg.msg_control = NULL; | |
4630 | msg.msg_controllen = 0; | |
4631 | msg.msg_namelen = 0; | |
4632 | msg.msg_iocb = NULL; | |
4633 | msg.msg_flags = 0; | |
fddaface | 4634 | |
7a7cacba PB |
4635 | flags = req->sr_msg.msg_flags; |
4636 | if (flags & MSG_DONTWAIT) | |
4637 | req->flags |= REQ_F_NOWAIT; | |
4638 | else if (force_nonblock) | |
4639 | flags |= MSG_DONTWAIT; | |
4640 | ||
4641 | ret = sock_recvmsg(sock, &msg, flags); | |
4642 | if (force_nonblock && ret == -EAGAIN) | |
4643 | return -EAGAIN; | |
4644 | if (ret == -ERESTARTSYS) | |
4645 | ret = -EINTR; | |
14c32eee | 4646 | out_free: |
7fbb1b54 PB |
4647 | if (req->flags & REQ_F_BUFFER_SELECTED) |
4648 | cflags = io_put_recv_kbuf(req); | |
fddaface JA |
4649 | if (ret < 0) |
4650 | req_set_fail_links(req); | |
229a7b63 | 4651 | __io_req_complete(req, ret, cflags, cs); |
fddaface | 4652 | return 0; |
fddaface JA |
4653 | } |
4654 | ||
3529d8c2 | 4655 | static int io_accept_prep(struct io_kiocb *req, const struct io_uring_sqe *sqe) |
17f2fe35 | 4656 | { |
8ed8d3c3 JA |
4657 | struct io_accept *accept = &req->accept; |
4658 | ||
17f2fe35 JA |
4659 | if (unlikely(req->ctx->flags & (IORING_SETUP_IOPOLL|IORING_SETUP_SQPOLL))) |
4660 | return -EINVAL; | |
8042d6ce | 4661 | if (sqe->ioprio || sqe->len || sqe->buf_index) |
17f2fe35 JA |
4662 | return -EINVAL; |
4663 | ||
d55e5f5b JA |
4664 | accept->addr = u64_to_user_ptr(READ_ONCE(sqe->addr)); |
4665 | accept->addr_len = u64_to_user_ptr(READ_ONCE(sqe->addr2)); | |
8ed8d3c3 | 4666 | accept->flags = READ_ONCE(sqe->accept_flags); |
09952e3e | 4667 | accept->nofile = rlimit(RLIMIT_NOFILE); |
8ed8d3c3 | 4668 | return 0; |
8ed8d3c3 | 4669 | } |
17f2fe35 | 4670 | |
229a7b63 JA |
4671 | static int io_accept(struct io_kiocb *req, bool force_nonblock, |
4672 | struct io_comp_state *cs) | |
8ed8d3c3 JA |
4673 | { |
4674 | struct io_accept *accept = &req->accept; | |
ac45abc0 | 4675 | unsigned int file_flags = force_nonblock ? O_NONBLOCK : 0; |
8ed8d3c3 JA |
4676 | int ret; |
4677 | ||
e697deed JX |
4678 | if (req->file->f_flags & O_NONBLOCK) |
4679 | req->flags |= REQ_F_NOWAIT; | |
4680 | ||
8ed8d3c3 | 4681 | ret = __sys_accept4_file(req->file, file_flags, accept->addr, |
09952e3e JA |
4682 | accept->addr_len, accept->flags, |
4683 | accept->nofile); | |
8ed8d3c3 | 4684 | if (ret == -EAGAIN && force_nonblock) |
17f2fe35 | 4685 | return -EAGAIN; |
ac45abc0 PB |
4686 | if (ret < 0) { |
4687 | if (ret == -ERESTARTSYS) | |
4688 | ret = -EINTR; | |
4e88d6e7 | 4689 | req_set_fail_links(req); |
ac45abc0 | 4690 | } |
229a7b63 | 4691 | __io_req_complete(req, ret, 0, cs); |
17f2fe35 | 4692 | return 0; |
8ed8d3c3 JA |
4693 | } |
4694 | ||
3529d8c2 | 4695 | static int io_connect_prep(struct io_kiocb *req, const struct io_uring_sqe *sqe) |
f499a021 | 4696 | { |
3529d8c2 | 4697 | struct io_connect *conn = &req->connect; |
e8c2bc1f | 4698 | struct io_async_connect *io = req->async_data; |
f499a021 | 4699 | |
3fbb51c1 JA |
4700 | if (unlikely(req->ctx->flags & (IORING_SETUP_IOPOLL|IORING_SETUP_SQPOLL))) |
4701 | return -EINVAL; | |
4702 | if (sqe->ioprio || sqe->len || sqe->buf_index || sqe->rw_flags) | |
4703 | return -EINVAL; | |
4704 | ||
3529d8c2 JA |
4705 | conn->addr = u64_to_user_ptr(READ_ONCE(sqe->addr)); |
4706 | conn->addr_len = READ_ONCE(sqe->addr2); | |
4707 | ||
4708 | if (!io) | |
4709 | return 0; | |
4710 | ||
4711 | return move_addr_to_kernel(conn->addr, conn->addr_len, | |
e8c2bc1f | 4712 | &io->address); |
f499a021 JA |
4713 | } |
4714 | ||
229a7b63 JA |
4715 | static int io_connect(struct io_kiocb *req, bool force_nonblock, |
4716 | struct io_comp_state *cs) | |
f8e85cf2 | 4717 | { |
e8c2bc1f | 4718 | struct io_async_connect __io, *io; |
f8e85cf2 | 4719 | unsigned file_flags; |
3fbb51c1 | 4720 | int ret; |
f8e85cf2 | 4721 | |
e8c2bc1f JA |
4722 | if (req->async_data) { |
4723 | io = req->async_data; | |
f499a021 | 4724 | } else { |
3529d8c2 JA |
4725 | ret = move_addr_to_kernel(req->connect.addr, |
4726 | req->connect.addr_len, | |
e8c2bc1f | 4727 | &__io.address); |
f499a021 JA |
4728 | if (ret) |
4729 | goto out; | |
4730 | io = &__io; | |
4731 | } | |
4732 | ||
3fbb51c1 JA |
4733 | file_flags = force_nonblock ? O_NONBLOCK : 0; |
4734 | ||
e8c2bc1f | 4735 | ret = __sys_connect_file(req->file, &io->address, |
3fbb51c1 | 4736 | req->connect.addr_len, file_flags); |
87f80d62 | 4737 | if ((ret == -EAGAIN || ret == -EINPROGRESS) && force_nonblock) { |
e8c2bc1f | 4738 | if (req->async_data) |
b7bb4f7d | 4739 | return -EAGAIN; |
e8c2bc1f | 4740 | if (io_alloc_async_data(req)) { |
f499a021 JA |
4741 | ret = -ENOMEM; |
4742 | goto out; | |
4743 | } | |
e8c2bc1f JA |
4744 | io = req->async_data; |
4745 | memcpy(req->async_data, &__io, sizeof(__io)); | |
f8e85cf2 | 4746 | return -EAGAIN; |
f499a021 | 4747 | } |
f8e85cf2 JA |
4748 | if (ret == -ERESTARTSYS) |
4749 | ret = -EINTR; | |
f499a021 | 4750 | out: |
4e88d6e7 JA |
4751 | if (ret < 0) |
4752 | req_set_fail_links(req); | |
229a7b63 | 4753 | __io_req_complete(req, ret, 0, cs); |
f8e85cf2 | 4754 | return 0; |
469956e8 Y |
4755 | } |
4756 | #else /* !CONFIG_NET */ | |
4757 | static int io_sendmsg_prep(struct io_kiocb *req, const struct io_uring_sqe *sqe) | |
4758 | { | |
f8e85cf2 | 4759 | return -EOPNOTSUPP; |
f8e85cf2 JA |
4760 | } |
4761 | ||
1e16c2f9 RD |
4762 | static int io_sendmsg(struct io_kiocb *req, bool force_nonblock, |
4763 | struct io_comp_state *cs) | |
469956e8 Y |
4764 | { |
4765 | return -EOPNOTSUPP; | |
4766 | } | |
4767 | ||
1e16c2f9 RD |
4768 | static int io_send(struct io_kiocb *req, bool force_nonblock, |
4769 | struct io_comp_state *cs) | |
469956e8 Y |
4770 | { |
4771 | return -EOPNOTSUPP; | |
4772 | } | |
4773 | ||
4774 | static int io_recvmsg_prep(struct io_kiocb *req, | |
4775 | const struct io_uring_sqe *sqe) | |
4776 | { | |
4777 | return -EOPNOTSUPP; | |
4778 | } | |
4779 | ||
1e16c2f9 RD |
4780 | static int io_recvmsg(struct io_kiocb *req, bool force_nonblock, |
4781 | struct io_comp_state *cs) | |
469956e8 Y |
4782 | { |
4783 | return -EOPNOTSUPP; | |
4784 | } | |
4785 | ||
1e16c2f9 RD |
4786 | static int io_recv(struct io_kiocb *req, bool force_nonblock, |
4787 | struct io_comp_state *cs) | |
469956e8 Y |
4788 | { |
4789 | return -EOPNOTSUPP; | |
4790 | } | |
4791 | ||
4792 | static int io_accept_prep(struct io_kiocb *req, const struct io_uring_sqe *sqe) | |
4793 | { | |
4794 | return -EOPNOTSUPP; | |
4795 | } | |
4796 | ||
1e16c2f9 RD |
4797 | static int io_accept(struct io_kiocb *req, bool force_nonblock, |
4798 | struct io_comp_state *cs) | |
469956e8 Y |
4799 | { |
4800 | return -EOPNOTSUPP; | |
4801 | } | |
ce593a6c | 4802 | |
469956e8 Y |
4803 | static int io_connect_prep(struct io_kiocb *req, const struct io_uring_sqe *sqe) |
4804 | { | |
4805 | return -EOPNOTSUPP; | |
4806 | } | |
4807 | ||
1e16c2f9 RD |
4808 | static int io_connect(struct io_kiocb *req, bool force_nonblock, |
4809 | struct io_comp_state *cs) | |
469956e8 | 4810 | { |
f8e85cf2 | 4811 | return -EOPNOTSUPP; |
ce593a6c | 4812 | } |
469956e8 | 4813 | #endif /* CONFIG_NET */ |
f8e85cf2 | 4814 | |
d7718a9d JA |
4815 | struct io_poll_table { |
4816 | struct poll_table_struct pt; | |
4817 | struct io_kiocb *req; | |
4818 | int error; | |
4819 | }; | |
ce593a6c | 4820 | |
d7718a9d JA |
4821 | static int __io_async_wake(struct io_kiocb *req, struct io_poll_iocb *poll, |
4822 | __poll_t mask, task_work_func_t func) | |
4823 | { | |
fd7d6de2 | 4824 | bool twa_signal_ok; |
aa96bf8a | 4825 | int ret; |
d7718a9d JA |
4826 | |
4827 | /* for instances that support it check for an event match first: */ | |
4828 | if (mask && !(mask & poll->events)) | |
4829 | return 0; | |
4830 | ||
4831 | trace_io_uring_task_add(req->ctx, req->opcode, req->user_data, mask); | |
4832 | ||
4833 | list_del_init(&poll->wait.entry); | |
4834 | ||
d7718a9d JA |
4835 | req->result = mask; |
4836 | init_task_work(&req->task_work, func); | |
6d816e08 JA |
4837 | percpu_ref_get(&req->ctx->refs); |
4838 | ||
fd7d6de2 JA |
4839 | /* |
4840 | * If we using the signalfd wait_queue_head for this wakeup, then | |
4841 | * it's not safe to use TWA_SIGNAL as we could be recursing on the | |
4842 | * tsk->sighand->siglock on doing the wakeup. Should not be needed | |
4843 | * either, as the normal wakeup will suffice. | |
4844 | */ | |
4845 | twa_signal_ok = (poll->head != &req->task->sighand->signalfd_wqh); | |
4846 | ||
d7718a9d | 4847 | /* |
e3aabf95 JA |
4848 | * If this fails, then the task is exiting. When a task exits, the |
4849 | * work gets canceled, so just cancel this request as well instead | |
4850 | * of executing it. We can't safely execute it anyway, as we may not | |
4851 | * have the needed state needed for it anyway. | |
d7718a9d | 4852 | */ |
87c4311f | 4853 | ret = io_req_task_work_add(req, twa_signal_ok); |
aa96bf8a | 4854 | if (unlikely(ret)) { |
c2c4c83c JA |
4855 | struct task_struct *tsk; |
4856 | ||
e3aabf95 | 4857 | WRITE_ONCE(poll->canceled, true); |
aa96bf8a | 4858 | tsk = io_wq_get_task(req->ctx->io_wq); |
ce593a6c JA |
4859 | task_work_add(tsk, &req->task_work, 0); |
4860 | wake_up_process(tsk); | |
aa96bf8a | 4861 | } |
d7718a9d JA |
4862 | return 1; |
4863 | } | |
4864 | ||
74ce6ce4 JA |
4865 | static bool io_poll_rewait(struct io_kiocb *req, struct io_poll_iocb *poll) |
4866 | __acquires(&req->ctx->completion_lock) | |
4867 | { | |
4868 | struct io_ring_ctx *ctx = req->ctx; | |
4869 | ||
4870 | if (!req->result && !READ_ONCE(poll->canceled)) { | |
4871 | struct poll_table_struct pt = { ._key = poll->events }; | |
4872 | ||
4873 | req->result = vfs_poll(req->file, &pt) & poll->events; | |
4874 | } | |
4875 | ||
4876 | spin_lock_irq(&ctx->completion_lock); | |
4877 | if (!req->result && !READ_ONCE(poll->canceled)) { | |
4878 | add_wait_queue(poll->head, &poll->wait); | |
4879 | return true; | |
4880 | } | |
4881 | ||
4882 | return false; | |
4883 | } | |
4884 | ||
d4e7cd36 | 4885 | static struct io_poll_iocb *io_poll_get_double(struct io_kiocb *req) |
18bceab1 | 4886 | { |
e8c2bc1f | 4887 | /* pure poll stashes this in ->async_data, poll driven retry elsewhere */ |
d4e7cd36 | 4888 | if (req->opcode == IORING_OP_POLL_ADD) |
e8c2bc1f | 4889 | return req->async_data; |
d4e7cd36 JA |
4890 | return req->apoll->double_poll; |
4891 | } | |
4892 | ||
4893 | static struct io_poll_iocb *io_poll_get_single(struct io_kiocb *req) | |
4894 | { | |
4895 | if (req->opcode == IORING_OP_POLL_ADD) | |
4896 | return &req->poll; | |
4897 | return &req->apoll->poll; | |
4898 | } | |
4899 | ||
4900 | static void io_poll_remove_double(struct io_kiocb *req) | |
4901 | { | |
4902 | struct io_poll_iocb *poll = io_poll_get_double(req); | |
18bceab1 JA |
4903 | |
4904 | lockdep_assert_held(&req->ctx->completion_lock); | |
4905 | ||
4906 | if (poll && poll->head) { | |
4907 | struct wait_queue_head *head = poll->head; | |
4908 | ||
4909 | spin_lock(&head->lock); | |
4910 | list_del_init(&poll->wait.entry); | |
4911 | if (poll->wait.private) | |
4912 | refcount_dec(&req->refs); | |
4913 | poll->head = NULL; | |
4914 | spin_unlock(&head->lock); | |
4915 | } | |
4916 | } | |
4917 | ||
4918 | static void io_poll_complete(struct io_kiocb *req, __poll_t mask, int error) | |
4919 | { | |
4920 | struct io_ring_ctx *ctx = req->ctx; | |
4921 | ||
d4e7cd36 | 4922 | io_poll_remove_double(req); |
18bceab1 JA |
4923 | req->poll.done = true; |
4924 | io_cqring_fill_event(req, error ? error : mangle_poll(mask)); | |
4925 | io_commit_cqring(ctx); | |
4926 | } | |
4927 | ||
dd221f46 | 4928 | static void io_poll_task_func(struct callback_head *cb) |
18bceab1 | 4929 | { |
dd221f46 | 4930 | struct io_kiocb *req = container_of(cb, struct io_kiocb, task_work); |
18bceab1 | 4931 | struct io_ring_ctx *ctx = req->ctx; |
dd221f46 | 4932 | struct io_kiocb *nxt; |
18bceab1 JA |
4933 | |
4934 | if (io_poll_rewait(req, &req->poll)) { | |
4935 | spin_unlock_irq(&ctx->completion_lock); | |
dd221f46 PB |
4936 | } else { |
4937 | hash_del(&req->hash_node); | |
4938 | io_poll_complete(req, req->result, 0); | |
4939 | spin_unlock_irq(&ctx->completion_lock); | |
18bceab1 | 4940 | |
dd221f46 PB |
4941 | nxt = io_put_req_find_next(req); |
4942 | io_cqring_ev_posted(ctx); | |
4943 | if (nxt) | |
4944 | __io_req_task_submit(nxt); | |
4945 | } | |
18bceab1 | 4946 | |
6d816e08 | 4947 | percpu_ref_put(&ctx->refs); |
18bceab1 JA |
4948 | } |
4949 | ||
4950 | static int io_poll_double_wake(struct wait_queue_entry *wait, unsigned mode, | |
4951 | int sync, void *key) | |
4952 | { | |
4953 | struct io_kiocb *req = wait->private; | |
d4e7cd36 | 4954 | struct io_poll_iocb *poll = io_poll_get_single(req); |
18bceab1 JA |
4955 | __poll_t mask = key_to_poll(key); |
4956 | ||
4957 | /* for instances that support it check for an event match first: */ | |
4958 | if (mask && !(mask & poll->events)) | |
4959 | return 0; | |
4960 | ||
8706e04e JA |
4961 | list_del_init(&wait->entry); |
4962 | ||
807abcb0 | 4963 | if (poll && poll->head) { |
18bceab1 JA |
4964 | bool done; |
4965 | ||
807abcb0 JA |
4966 | spin_lock(&poll->head->lock); |
4967 | done = list_empty(&poll->wait.entry); | |
18bceab1 | 4968 | if (!done) |
807abcb0 | 4969 | list_del_init(&poll->wait.entry); |
d4e7cd36 JA |
4970 | /* make sure double remove sees this as being gone */ |
4971 | wait->private = NULL; | |
807abcb0 | 4972 | spin_unlock(&poll->head->lock); |
18bceab1 JA |
4973 | if (!done) |
4974 | __io_async_wake(req, poll, mask, io_poll_task_func); | |
4975 | } | |
4976 | refcount_dec(&req->refs); | |
4977 | return 1; | |
4978 | } | |
4979 | ||
4980 | static void io_init_poll_iocb(struct io_poll_iocb *poll, __poll_t events, | |
4981 | wait_queue_func_t wake_func) | |
4982 | { | |
4983 | poll->head = NULL; | |
4984 | poll->done = false; | |
4985 | poll->canceled = false; | |
4986 | poll->events = events; | |
4987 | INIT_LIST_HEAD(&poll->wait.entry); | |
4988 | init_waitqueue_func_entry(&poll->wait, wake_func); | |
4989 | } | |
4990 | ||
4991 | static void __io_queue_proc(struct io_poll_iocb *poll, struct io_poll_table *pt, | |
807abcb0 JA |
4992 | struct wait_queue_head *head, |
4993 | struct io_poll_iocb **poll_ptr) | |
18bceab1 JA |
4994 | { |
4995 | struct io_kiocb *req = pt->req; | |
4996 | ||
4997 | /* | |
4998 | * If poll->head is already set, it's because the file being polled | |
4999 | * uses multiple waitqueues for poll handling (eg one for read, one | |
5000 | * for write). Setup a separate io_poll_iocb if this happens. | |
5001 | */ | |
5002 | if (unlikely(poll->head)) { | |
58852d4d PB |
5003 | struct io_poll_iocb *poll_one = poll; |
5004 | ||
18bceab1 | 5005 | /* already have a 2nd entry, fail a third attempt */ |
807abcb0 | 5006 | if (*poll_ptr) { |
18bceab1 JA |
5007 | pt->error = -EINVAL; |
5008 | return; | |
5009 | } | |
5010 | poll = kmalloc(sizeof(*poll), GFP_ATOMIC); | |
5011 | if (!poll) { | |
5012 | pt->error = -ENOMEM; | |
5013 | return; | |
5014 | } | |
58852d4d | 5015 | io_init_poll_iocb(poll, poll_one->events, io_poll_double_wake); |
18bceab1 JA |
5016 | refcount_inc(&req->refs); |
5017 | poll->wait.private = req; | |
807abcb0 | 5018 | *poll_ptr = poll; |
18bceab1 JA |
5019 | } |
5020 | ||
5021 | pt->error = 0; | |
5022 | poll->head = head; | |
a31eb4a2 JX |
5023 | |
5024 | if (poll->events & EPOLLEXCLUSIVE) | |
5025 | add_wait_queue_exclusive(head, &poll->wait); | |
5026 | else | |
5027 | add_wait_queue(head, &poll->wait); | |
18bceab1 JA |
5028 | } |
5029 | ||
5030 | static void io_async_queue_proc(struct file *file, struct wait_queue_head *head, | |
5031 | struct poll_table_struct *p) | |
5032 | { | |
5033 | struct io_poll_table *pt = container_of(p, struct io_poll_table, pt); | |
807abcb0 | 5034 | struct async_poll *apoll = pt->req->apoll; |
18bceab1 | 5035 | |
807abcb0 | 5036 | __io_queue_proc(&apoll->poll, pt, head, &apoll->double_poll); |
18bceab1 JA |
5037 | } |
5038 | ||
d7718a9d JA |
5039 | static void io_async_task_func(struct callback_head *cb) |
5040 | { | |
5041 | struct io_kiocb *req = container_of(cb, struct io_kiocb, task_work); | |
5042 | struct async_poll *apoll = req->apoll; | |
5043 | struct io_ring_ctx *ctx = req->ctx; | |
5044 | ||
5045 | trace_io_uring_task_run(req->ctx, req->opcode, req->user_data); | |
5046 | ||
74ce6ce4 | 5047 | if (io_poll_rewait(req, &apoll->poll)) { |
d7718a9d | 5048 | spin_unlock_irq(&ctx->completion_lock); |
6d816e08 | 5049 | percpu_ref_put(&ctx->refs); |
74ce6ce4 | 5050 | return; |
d7718a9d JA |
5051 | } |
5052 | ||
31067255 | 5053 | /* If req is still hashed, it cannot have been canceled. Don't check. */ |
0be0b0e3 | 5054 | if (hash_hashed(&req->hash_node)) |
74ce6ce4 | 5055 | hash_del(&req->hash_node); |
2bae047e | 5056 | |
d4e7cd36 | 5057 | io_poll_remove_double(req); |
74ce6ce4 JA |
5058 | spin_unlock_irq(&ctx->completion_lock); |
5059 | ||
0be0b0e3 PB |
5060 | if (!READ_ONCE(apoll->poll.canceled)) |
5061 | __io_req_task_submit(req); | |
5062 | else | |
5063 | __io_req_task_cancel(req, -ECANCELED); | |
aa340845 | 5064 | |
6d816e08 | 5065 | percpu_ref_put(&ctx->refs); |
807abcb0 | 5066 | kfree(apoll->double_poll); |
31067255 | 5067 | kfree(apoll); |
d7718a9d JA |
5068 | } |
5069 | ||
5070 | static int io_async_wake(struct wait_queue_entry *wait, unsigned mode, int sync, | |
5071 | void *key) | |
5072 | { | |
5073 | struct io_kiocb *req = wait->private; | |
5074 | struct io_poll_iocb *poll = &req->apoll->poll; | |
5075 | ||
5076 | trace_io_uring_poll_wake(req->ctx, req->opcode, req->user_data, | |
5077 | key_to_poll(key)); | |
5078 | ||
5079 | return __io_async_wake(req, poll, key_to_poll(key), io_async_task_func); | |
5080 | } | |
5081 | ||
5082 | static void io_poll_req_insert(struct io_kiocb *req) | |
5083 | { | |
5084 | struct io_ring_ctx *ctx = req->ctx; | |
5085 | struct hlist_head *list; | |
5086 | ||
5087 | list = &ctx->cancel_hash[hash_long(req->user_data, ctx->cancel_hash_bits)]; | |
5088 | hlist_add_head(&req->hash_node, list); | |
5089 | } | |
5090 | ||
5091 | static __poll_t __io_arm_poll_handler(struct io_kiocb *req, | |
5092 | struct io_poll_iocb *poll, | |
5093 | struct io_poll_table *ipt, __poll_t mask, | |
5094 | wait_queue_func_t wake_func) | |
5095 | __acquires(&ctx->completion_lock) | |
5096 | { | |
5097 | struct io_ring_ctx *ctx = req->ctx; | |
5098 | bool cancel = false; | |
5099 | ||
18bceab1 | 5100 | io_init_poll_iocb(poll, mask, wake_func); |
b90cd197 | 5101 | poll->file = req->file; |
18bceab1 | 5102 | poll->wait.private = req; |
d7718a9d JA |
5103 | |
5104 | ipt->pt._key = mask; | |
5105 | ipt->req = req; | |
5106 | ipt->error = -EINVAL; | |
5107 | ||
d7718a9d JA |
5108 | mask = vfs_poll(req->file, &ipt->pt) & poll->events; |
5109 | ||
5110 | spin_lock_irq(&ctx->completion_lock); | |
5111 | if (likely(poll->head)) { | |
5112 | spin_lock(&poll->head->lock); | |
5113 | if (unlikely(list_empty(&poll->wait.entry))) { | |
5114 | if (ipt->error) | |
5115 | cancel = true; | |
5116 | ipt->error = 0; | |
5117 | mask = 0; | |
5118 | } | |
5119 | if (mask || ipt->error) | |
5120 | list_del_init(&poll->wait.entry); | |
5121 | else if (cancel) | |
5122 | WRITE_ONCE(poll->canceled, true); | |
5123 | else if (!poll->done) /* actually waiting for an event */ | |
5124 | io_poll_req_insert(req); | |
5125 | spin_unlock(&poll->head->lock); | |
5126 | } | |
5127 | ||
5128 | return mask; | |
5129 | } | |
5130 | ||
5131 | static bool io_arm_poll_handler(struct io_kiocb *req) | |
5132 | { | |
5133 | const struct io_op_def *def = &io_op_defs[req->opcode]; | |
5134 | struct io_ring_ctx *ctx = req->ctx; | |
5135 | struct async_poll *apoll; | |
5136 | struct io_poll_table ipt; | |
5137 | __poll_t mask, ret; | |
9dab14b8 | 5138 | int rw; |
d7718a9d JA |
5139 | |
5140 | if (!req->file || !file_can_poll(req->file)) | |
5141 | return false; | |
24c74678 | 5142 | if (req->flags & REQ_F_POLLED) |
d7718a9d | 5143 | return false; |
9dab14b8 JA |
5144 | if (def->pollin) |
5145 | rw = READ; | |
5146 | else if (def->pollout) | |
5147 | rw = WRITE; | |
5148 | else | |
5149 | return false; | |
5150 | /* if we can't nonblock try, then no point in arming a poll handler */ | |
5151 | if (!io_file_supports_async(req->file, rw)) | |
d7718a9d JA |
5152 | return false; |
5153 | ||
5154 | apoll = kmalloc(sizeof(*apoll), GFP_ATOMIC); | |
5155 | if (unlikely(!apoll)) | |
5156 | return false; | |
807abcb0 | 5157 | apoll->double_poll = NULL; |
d7718a9d JA |
5158 | |
5159 | req->flags |= REQ_F_POLLED; | |
d7718a9d JA |
5160 | req->apoll = apoll; |
5161 | INIT_HLIST_NODE(&req->hash_node); | |
5162 | ||
8755d97a | 5163 | mask = 0; |
d7718a9d | 5164 | if (def->pollin) |
8755d97a | 5165 | mask |= POLLIN | POLLRDNORM; |
d7718a9d JA |
5166 | if (def->pollout) |
5167 | mask |= POLLOUT | POLLWRNORM; | |
901341bb LH |
5168 | |
5169 | /* If reading from MSG_ERRQUEUE using recvmsg, ignore POLLIN */ | |
5170 | if ((req->opcode == IORING_OP_RECVMSG) && | |
5171 | (req->sr_msg.msg_flags & MSG_ERRQUEUE)) | |
5172 | mask &= ~POLLIN; | |
5173 | ||
d7718a9d JA |
5174 | mask |= POLLERR | POLLPRI; |
5175 | ||
5176 | ipt.pt._qproc = io_async_queue_proc; | |
5177 | ||
5178 | ret = __io_arm_poll_handler(req, &apoll->poll, &ipt, mask, | |
5179 | io_async_wake); | |
a36da65c | 5180 | if (ret || ipt.error) { |
d4e7cd36 | 5181 | io_poll_remove_double(req); |
d7718a9d | 5182 | spin_unlock_irq(&ctx->completion_lock); |
807abcb0 | 5183 | kfree(apoll->double_poll); |
d7718a9d JA |
5184 | kfree(apoll); |
5185 | return false; | |
5186 | } | |
5187 | spin_unlock_irq(&ctx->completion_lock); | |
5188 | trace_io_uring_poll_arm(ctx, req->opcode, req->user_data, mask, | |
5189 | apoll->poll.events); | |
5190 | return true; | |
5191 | } | |
5192 | ||
5193 | static bool __io_poll_remove_one(struct io_kiocb *req, | |
5194 | struct io_poll_iocb *poll) | |
221c5eb2 | 5195 | { |
b41e9852 | 5196 | bool do_complete = false; |
221c5eb2 JA |
5197 | |
5198 | spin_lock(&poll->head->lock); | |
5199 | WRITE_ONCE(poll->canceled, true); | |
392edb45 JA |
5200 | if (!list_empty(&poll->wait.entry)) { |
5201 | list_del_init(&poll->wait.entry); | |
b41e9852 | 5202 | do_complete = true; |
221c5eb2 JA |
5203 | } |
5204 | spin_unlock(&poll->head->lock); | |
3bfa5bcb | 5205 | hash_del(&req->hash_node); |
d7718a9d JA |
5206 | return do_complete; |
5207 | } | |
5208 | ||
5209 | static bool io_poll_remove_one(struct io_kiocb *req) | |
5210 | { | |
5211 | bool do_complete; | |
5212 | ||
d4e7cd36 JA |
5213 | io_poll_remove_double(req); |
5214 | ||
d7718a9d JA |
5215 | if (req->opcode == IORING_OP_POLL_ADD) { |
5216 | do_complete = __io_poll_remove_one(req, &req->poll); | |
5217 | } else { | |
3bfa5bcb JA |
5218 | struct async_poll *apoll = req->apoll; |
5219 | ||
d7718a9d | 5220 | /* non-poll requests have submit ref still */ |
3bfa5bcb JA |
5221 | do_complete = __io_poll_remove_one(req, &apoll->poll); |
5222 | if (do_complete) { | |
d7718a9d | 5223 | io_put_req(req); |
807abcb0 | 5224 | kfree(apoll->double_poll); |
3bfa5bcb JA |
5225 | kfree(apoll); |
5226 | } | |
b1f573bd XW |
5227 | } |
5228 | ||
b41e9852 JA |
5229 | if (do_complete) { |
5230 | io_cqring_fill_event(req, -ECANCELED); | |
5231 | io_commit_cqring(req->ctx); | |
f254ac04 | 5232 | req_set_fail_links(req); |
216578e5 | 5233 | io_put_req_deferred(req, 1); |
b41e9852 JA |
5234 | } |
5235 | ||
5236 | return do_complete; | |
221c5eb2 JA |
5237 | } |
5238 | ||
76e1b642 JA |
5239 | /* |
5240 | * Returns true if we found and killed one or more poll requests | |
5241 | */ | |
5242 | static bool io_poll_remove_all(struct io_ring_ctx *ctx, struct task_struct *tsk) | |
221c5eb2 | 5243 | { |
78076bb6 | 5244 | struct hlist_node *tmp; |
221c5eb2 | 5245 | struct io_kiocb *req; |
8e2e1faf | 5246 | int posted = 0, i; |
221c5eb2 JA |
5247 | |
5248 | spin_lock_irq(&ctx->completion_lock); | |
78076bb6 JA |
5249 | for (i = 0; i < (1U << ctx->cancel_hash_bits); i++) { |
5250 | struct hlist_head *list; | |
5251 | ||
5252 | list = &ctx->cancel_hash[i]; | |
f3606e3a JA |
5253 | hlist_for_each_entry_safe(req, tmp, list, hash_node) { |
5254 | if (io_task_match(req, tsk)) | |
5255 | posted += io_poll_remove_one(req); | |
5256 | } | |
221c5eb2 JA |
5257 | } |
5258 | spin_unlock_irq(&ctx->completion_lock); | |
b41e9852 | 5259 | |
8e2e1faf JA |
5260 | if (posted) |
5261 | io_cqring_ev_posted(ctx); | |
76e1b642 JA |
5262 | |
5263 | return posted != 0; | |
221c5eb2 JA |
5264 | } |
5265 | ||
47f46768 JA |
5266 | static int io_poll_cancel(struct io_ring_ctx *ctx, __u64 sqe_addr) |
5267 | { | |
78076bb6 | 5268 | struct hlist_head *list; |
47f46768 JA |
5269 | struct io_kiocb *req; |
5270 | ||
78076bb6 JA |
5271 | list = &ctx->cancel_hash[hash_long(sqe_addr, ctx->cancel_hash_bits)]; |
5272 | hlist_for_each_entry(req, list, hash_node) { | |
b41e9852 JA |
5273 | if (sqe_addr != req->user_data) |
5274 | continue; | |
5275 | if (io_poll_remove_one(req)) | |
eac406c6 | 5276 | return 0; |
b41e9852 | 5277 | return -EALREADY; |
47f46768 JA |
5278 | } |
5279 | ||
5280 | return -ENOENT; | |
5281 | } | |
5282 | ||
3529d8c2 JA |
5283 | static int io_poll_remove_prep(struct io_kiocb *req, |
5284 | const struct io_uring_sqe *sqe) | |
0969e783 | 5285 | { |
0969e783 JA |
5286 | if (unlikely(req->ctx->flags & IORING_SETUP_IOPOLL)) |
5287 | return -EINVAL; | |
5288 | if (sqe->ioprio || sqe->off || sqe->len || sqe->buf_index || | |
5289 | sqe->poll_events) | |
5290 | return -EINVAL; | |
5291 | ||
5292 | req->poll.addr = READ_ONCE(sqe->addr); | |
0969e783 JA |
5293 | return 0; |
5294 | } | |
5295 | ||
221c5eb2 JA |
5296 | /* |
5297 | * Find a running poll command that matches one specified in sqe->addr, | |
5298 | * and remove it if found. | |
5299 | */ | |
fc4df999 | 5300 | static int io_poll_remove(struct io_kiocb *req) |
221c5eb2 JA |
5301 | { |
5302 | struct io_ring_ctx *ctx = req->ctx; | |
0969e783 | 5303 | u64 addr; |
47f46768 | 5304 | int ret; |
221c5eb2 | 5305 | |
0969e783 | 5306 | addr = req->poll.addr; |
221c5eb2 | 5307 | spin_lock_irq(&ctx->completion_lock); |
0969e783 | 5308 | ret = io_poll_cancel(ctx, addr); |
221c5eb2 JA |
5309 | spin_unlock_irq(&ctx->completion_lock); |
5310 | ||
4e88d6e7 JA |
5311 | if (ret < 0) |
5312 | req_set_fail_links(req); | |
e1e16097 | 5313 | io_req_complete(req, ret); |
221c5eb2 JA |
5314 | return 0; |
5315 | } | |
5316 | ||
221c5eb2 JA |
5317 | static int io_poll_wake(struct wait_queue_entry *wait, unsigned mode, int sync, |
5318 | void *key) | |
5319 | { | |
c2f2eb7d JA |
5320 | struct io_kiocb *req = wait->private; |
5321 | struct io_poll_iocb *poll = &req->poll; | |
221c5eb2 | 5322 | |
d7718a9d | 5323 | return __io_async_wake(req, poll, key_to_poll(key), io_poll_task_func); |
221c5eb2 JA |
5324 | } |
5325 | ||
221c5eb2 JA |
5326 | static void io_poll_queue_proc(struct file *file, struct wait_queue_head *head, |
5327 | struct poll_table_struct *p) | |
5328 | { | |
5329 | struct io_poll_table *pt = container_of(p, struct io_poll_table, pt); | |
5330 | ||
e8c2bc1f | 5331 | __io_queue_proc(&pt->req->poll, pt, head, (struct io_poll_iocb **) &pt->req->async_data); |
eac406c6 JA |
5332 | } |
5333 | ||
3529d8c2 | 5334 | static int io_poll_add_prep(struct io_kiocb *req, const struct io_uring_sqe *sqe) |
221c5eb2 JA |
5335 | { |
5336 | struct io_poll_iocb *poll = &req->poll; | |
5769a351 | 5337 | u32 events; |
221c5eb2 JA |
5338 | |
5339 | if (unlikely(req->ctx->flags & IORING_SETUP_IOPOLL)) | |
5340 | return -EINVAL; | |
5341 | if (sqe->addr || sqe->ioprio || sqe->off || sqe->len || sqe->buf_index) | |
5342 | return -EINVAL; | |
5343 | ||
5769a351 JX |
5344 | events = READ_ONCE(sqe->poll32_events); |
5345 | #ifdef __BIG_ENDIAN | |
5346 | events = swahw32(events); | |
5347 | #endif | |
a31eb4a2 JX |
5348 | poll->events = demangle_poll(events) | EPOLLERR | EPOLLHUP | |
5349 | (events & EPOLLEXCLUSIVE); | |
0969e783 JA |
5350 | return 0; |
5351 | } | |
5352 | ||
014db007 | 5353 | static int io_poll_add(struct io_kiocb *req) |
0969e783 JA |
5354 | { |
5355 | struct io_poll_iocb *poll = &req->poll; | |
5356 | struct io_ring_ctx *ctx = req->ctx; | |
5357 | struct io_poll_table ipt; | |
0969e783 | 5358 | __poll_t mask; |
0969e783 | 5359 | |
78076bb6 | 5360 | INIT_HLIST_NODE(&req->hash_node); |
d7718a9d | 5361 | ipt.pt._qproc = io_poll_queue_proc; |
36703247 | 5362 | |
d7718a9d JA |
5363 | mask = __io_arm_poll_handler(req, &req->poll, &ipt, poll->events, |
5364 | io_poll_wake); | |
221c5eb2 | 5365 | |
8c838788 | 5366 | if (mask) { /* no async, we'd stolen it */ |
221c5eb2 | 5367 | ipt.error = 0; |
b0dd8a41 | 5368 | io_poll_complete(req, mask, 0); |
221c5eb2 | 5369 | } |
221c5eb2 JA |
5370 | spin_unlock_irq(&ctx->completion_lock); |
5371 | ||
8c838788 JA |
5372 | if (mask) { |
5373 | io_cqring_ev_posted(ctx); | |
014db007 | 5374 | io_put_req(req); |
221c5eb2 | 5375 | } |
8c838788 | 5376 | return ipt.error; |
221c5eb2 JA |
5377 | } |
5378 | ||
5262f567 JA |
5379 | static enum hrtimer_restart io_timeout_fn(struct hrtimer *timer) |
5380 | { | |
ad8a48ac JA |
5381 | struct io_timeout_data *data = container_of(timer, |
5382 | struct io_timeout_data, timer); | |
5383 | struct io_kiocb *req = data->req; | |
5384 | struct io_ring_ctx *ctx = req->ctx; | |
5262f567 JA |
5385 | unsigned long flags; |
5386 | ||
5262f567 | 5387 | spin_lock_irqsave(&ctx->completion_lock, flags); |
a71976f3 | 5388 | list_del_init(&req->timeout.list); |
01cec8c1 PB |
5389 | atomic_set(&req->ctx->cq_timeouts, |
5390 | atomic_read(&req->ctx->cq_timeouts) + 1); | |
5391 | ||
78e19bbe | 5392 | io_cqring_fill_event(req, -ETIME); |
5262f567 JA |
5393 | io_commit_cqring(ctx); |
5394 | spin_unlock_irqrestore(&ctx->completion_lock, flags); | |
5395 | ||
5396 | io_cqring_ev_posted(ctx); | |
4e88d6e7 | 5397 | req_set_fail_links(req); |
5262f567 JA |
5398 | io_put_req(req); |
5399 | return HRTIMER_NORESTART; | |
5400 | } | |
5401 | ||
f254ac04 JA |
5402 | static int __io_timeout_cancel(struct io_kiocb *req) |
5403 | { | |
e8c2bc1f | 5404 | struct io_timeout_data *io = req->async_data; |
f254ac04 JA |
5405 | int ret; |
5406 | ||
e8c2bc1f | 5407 | ret = hrtimer_try_to_cancel(&io->timer); |
f254ac04 JA |
5408 | if (ret == -1) |
5409 | return -EALREADY; | |
a71976f3 | 5410 | list_del_init(&req->timeout.list); |
f254ac04 JA |
5411 | |
5412 | req_set_fail_links(req); | |
f254ac04 | 5413 | io_cqring_fill_event(req, -ECANCELED); |
216578e5 | 5414 | io_put_req_deferred(req, 1); |
f254ac04 JA |
5415 | return 0; |
5416 | } | |
5417 | ||
47f46768 JA |
5418 | static int io_timeout_cancel(struct io_ring_ctx *ctx, __u64 user_data) |
5419 | { | |
5420 | struct io_kiocb *req; | |
5421 | int ret = -ENOENT; | |
5422 | ||
135fcde8 | 5423 | list_for_each_entry(req, &ctx->timeout_list, timeout.list) { |
47f46768 | 5424 | if (user_data == req->user_data) { |
47f46768 JA |
5425 | ret = 0; |
5426 | break; | |
5427 | } | |
5428 | } | |
5429 | ||
5430 | if (ret == -ENOENT) | |
5431 | return ret; | |
5432 | ||
f254ac04 | 5433 | return __io_timeout_cancel(req); |
47f46768 JA |
5434 | } |
5435 | ||
3529d8c2 JA |
5436 | static int io_timeout_remove_prep(struct io_kiocb *req, |
5437 | const struct io_uring_sqe *sqe) | |
b29472ee | 5438 | { |
b29472ee JA |
5439 | if (unlikely(req->ctx->flags & IORING_SETUP_IOPOLL)) |
5440 | return -EINVAL; | |
61710e43 DA |
5441 | if (unlikely(req->flags & (REQ_F_FIXED_FILE | REQ_F_BUFFER_SELECT))) |
5442 | return -EINVAL; | |
0bdf7a2d | 5443 | if (sqe->ioprio || sqe->buf_index || sqe->len || sqe->timeout_flags) |
b29472ee JA |
5444 | return -EINVAL; |
5445 | ||
0bdf7a2d | 5446 | req->timeout_rem.addr = READ_ONCE(sqe->addr); |
b29472ee JA |
5447 | return 0; |
5448 | } | |
5449 | ||
11365043 JA |
5450 | /* |
5451 | * Remove or update an existing timeout command | |
5452 | */ | |
fc4df999 | 5453 | static int io_timeout_remove(struct io_kiocb *req) |
11365043 JA |
5454 | { |
5455 | struct io_ring_ctx *ctx = req->ctx; | |
47f46768 | 5456 | int ret; |
11365043 | 5457 | |
11365043 | 5458 | spin_lock_irq(&ctx->completion_lock); |
0bdf7a2d | 5459 | ret = io_timeout_cancel(ctx, req->timeout_rem.addr); |
11365043 | 5460 | |
47f46768 | 5461 | io_cqring_fill_event(req, ret); |
11365043 JA |
5462 | io_commit_cqring(ctx); |
5463 | spin_unlock_irq(&ctx->completion_lock); | |
5262f567 | 5464 | io_cqring_ev_posted(ctx); |
4e88d6e7 JA |
5465 | if (ret < 0) |
5466 | req_set_fail_links(req); | |
ec9c02ad | 5467 | io_put_req(req); |
11365043 | 5468 | return 0; |
5262f567 JA |
5469 | } |
5470 | ||
3529d8c2 | 5471 | static int io_timeout_prep(struct io_kiocb *req, const struct io_uring_sqe *sqe, |
2d28390a | 5472 | bool is_timeout_link) |
5262f567 | 5473 | { |
ad8a48ac | 5474 | struct io_timeout_data *data; |
a41525ab | 5475 | unsigned flags; |
56080b02 | 5476 | u32 off = READ_ONCE(sqe->off); |
5262f567 | 5477 | |
ad8a48ac | 5478 | if (unlikely(req->ctx->flags & IORING_SETUP_IOPOLL)) |
5262f567 | 5479 | return -EINVAL; |
ad8a48ac | 5480 | if (sqe->ioprio || sqe->buf_index || sqe->len != 1) |
a41525ab | 5481 | return -EINVAL; |
56080b02 | 5482 | if (off && is_timeout_link) |
2d28390a | 5483 | return -EINVAL; |
a41525ab JA |
5484 | flags = READ_ONCE(sqe->timeout_flags); |
5485 | if (flags & ~IORING_TIMEOUT_ABS) | |
5262f567 | 5486 | return -EINVAL; |
bdf20073 | 5487 | |
bfe68a22 | 5488 | req->timeout.off = off; |
26a61679 | 5489 | |
e8c2bc1f | 5490 | if (!req->async_data && io_alloc_async_data(req)) |
26a61679 JA |
5491 | return -ENOMEM; |
5492 | ||
e8c2bc1f | 5493 | data = req->async_data; |
ad8a48ac | 5494 | data->req = req; |
ad8a48ac JA |
5495 | |
5496 | if (get_timespec64(&data->ts, u64_to_user_ptr(sqe->addr))) | |
5262f567 JA |
5497 | return -EFAULT; |
5498 | ||
11365043 | 5499 | if (flags & IORING_TIMEOUT_ABS) |
ad8a48ac | 5500 | data->mode = HRTIMER_MODE_ABS; |
11365043 | 5501 | else |
ad8a48ac | 5502 | data->mode = HRTIMER_MODE_REL; |
11365043 | 5503 | |
ad8a48ac JA |
5504 | hrtimer_init(&data->timer, CLOCK_MONOTONIC, data->mode); |
5505 | return 0; | |
5506 | } | |
5507 | ||
fc4df999 | 5508 | static int io_timeout(struct io_kiocb *req) |
ad8a48ac | 5509 | { |
ad8a48ac | 5510 | struct io_ring_ctx *ctx = req->ctx; |
e8c2bc1f | 5511 | struct io_timeout_data *data = req->async_data; |
ad8a48ac | 5512 | struct list_head *entry; |
bfe68a22 | 5513 | u32 tail, off = req->timeout.off; |
ad8a48ac | 5514 | |
733f5c95 | 5515 | spin_lock_irq(&ctx->completion_lock); |
93bd25bb | 5516 | |
5262f567 JA |
5517 | /* |
5518 | * sqe->off holds how many events that need to occur for this | |
93bd25bb JA |
5519 | * timeout event to be satisfied. If it isn't set, then this is |
5520 | * a pure timeout request, sequence isn't used. | |
5262f567 | 5521 | */ |
8eb7e2d0 | 5522 | if (io_is_timeout_noseq(req)) { |
93bd25bb JA |
5523 | entry = ctx->timeout_list.prev; |
5524 | goto add; | |
5525 | } | |
5262f567 | 5526 | |
bfe68a22 PB |
5527 | tail = ctx->cached_cq_tail - atomic_read(&ctx->cq_timeouts); |
5528 | req->timeout.target_seq = tail + off; | |
5262f567 JA |
5529 | |
5530 | /* | |
5531 | * Insertion sort, ensuring the first entry in the list is always | |
5532 | * the one we need first. | |
5533 | */ | |
5262f567 | 5534 | list_for_each_prev(entry, &ctx->timeout_list) { |
135fcde8 PB |
5535 | struct io_kiocb *nxt = list_entry(entry, struct io_kiocb, |
5536 | timeout.list); | |
5262f567 | 5537 | |
8eb7e2d0 | 5538 | if (io_is_timeout_noseq(nxt)) |
93bd25bb | 5539 | continue; |
bfe68a22 PB |
5540 | /* nxt.seq is behind @tail, otherwise would've been completed */ |
5541 | if (off >= nxt->timeout.target_seq - tail) | |
5262f567 JA |
5542 | break; |
5543 | } | |
93bd25bb | 5544 | add: |
135fcde8 | 5545 | list_add(&req->timeout.list, entry); |
ad8a48ac JA |
5546 | data->timer.function = io_timeout_fn; |
5547 | hrtimer_start(&data->timer, timespec64_to_ktime(data->ts), data->mode); | |
5262f567 | 5548 | spin_unlock_irq(&ctx->completion_lock); |
5262f567 JA |
5549 | return 0; |
5550 | } | |
5262f567 | 5551 | |
62755e35 JA |
5552 | static bool io_cancel_cb(struct io_wq_work *work, void *data) |
5553 | { | |
5554 | struct io_kiocb *req = container_of(work, struct io_kiocb, work); | |
5555 | ||
5556 | return req->user_data == (unsigned long) data; | |
5557 | } | |
5558 | ||
e977d6d3 | 5559 | static int io_async_cancel_one(struct io_ring_ctx *ctx, void *sqe_addr) |
62755e35 | 5560 | { |
62755e35 | 5561 | enum io_wq_cancel cancel_ret; |
62755e35 JA |
5562 | int ret = 0; |
5563 | ||
4f26bda1 | 5564 | cancel_ret = io_wq_cancel_cb(ctx->io_wq, io_cancel_cb, sqe_addr, false); |
62755e35 JA |
5565 | switch (cancel_ret) { |
5566 | case IO_WQ_CANCEL_OK: | |
5567 | ret = 0; | |
5568 | break; | |
5569 | case IO_WQ_CANCEL_RUNNING: | |
5570 | ret = -EALREADY; | |
5571 | break; | |
5572 | case IO_WQ_CANCEL_NOTFOUND: | |
5573 | ret = -ENOENT; | |
5574 | break; | |
5575 | } | |
5576 | ||
e977d6d3 JA |
5577 | return ret; |
5578 | } | |
5579 | ||
47f46768 JA |
5580 | static void io_async_find_and_cancel(struct io_ring_ctx *ctx, |
5581 | struct io_kiocb *req, __u64 sqe_addr, | |
014db007 | 5582 | int success_ret) |
47f46768 JA |
5583 | { |
5584 | unsigned long flags; | |
5585 | int ret; | |
5586 | ||
5587 | ret = io_async_cancel_one(ctx, (void *) (unsigned long) sqe_addr); | |
5588 | if (ret != -ENOENT) { | |
5589 | spin_lock_irqsave(&ctx->completion_lock, flags); | |
5590 | goto done; | |
5591 | } | |
5592 | ||
5593 | spin_lock_irqsave(&ctx->completion_lock, flags); | |
5594 | ret = io_timeout_cancel(ctx, sqe_addr); | |
5595 | if (ret != -ENOENT) | |
5596 | goto done; | |
5597 | ret = io_poll_cancel(ctx, sqe_addr); | |
5598 | done: | |
b0dd8a41 JA |
5599 | if (!ret) |
5600 | ret = success_ret; | |
47f46768 JA |
5601 | io_cqring_fill_event(req, ret); |
5602 | io_commit_cqring(ctx); | |
5603 | spin_unlock_irqrestore(&ctx->completion_lock, flags); | |
5604 | io_cqring_ev_posted(ctx); | |
5605 | ||
4e88d6e7 JA |
5606 | if (ret < 0) |
5607 | req_set_fail_links(req); | |
014db007 | 5608 | io_put_req(req); |
47f46768 JA |
5609 | } |
5610 | ||
3529d8c2 JA |
5611 | static int io_async_cancel_prep(struct io_kiocb *req, |
5612 | const struct io_uring_sqe *sqe) | |
e977d6d3 | 5613 | { |
fbf23849 | 5614 | if (unlikely(req->ctx->flags & IORING_SETUP_IOPOLL)) |
e977d6d3 | 5615 | return -EINVAL; |
61710e43 DA |
5616 | if (unlikely(req->flags & (REQ_F_FIXED_FILE | REQ_F_BUFFER_SELECT))) |
5617 | return -EINVAL; | |
5618 | if (sqe->ioprio || sqe->off || sqe->len || sqe->cancel_flags) | |
e977d6d3 JA |
5619 | return -EINVAL; |
5620 | ||
fbf23849 JA |
5621 | req->cancel.addr = READ_ONCE(sqe->addr); |
5622 | return 0; | |
5623 | } | |
5624 | ||
014db007 | 5625 | static int io_async_cancel(struct io_kiocb *req) |
fbf23849 JA |
5626 | { |
5627 | struct io_ring_ctx *ctx = req->ctx; | |
fbf23849 | 5628 | |
014db007 | 5629 | io_async_find_and_cancel(ctx, req, req->cancel.addr, 0); |
5262f567 JA |
5630 | return 0; |
5631 | } | |
5632 | ||
05f3fb3c JA |
5633 | static int io_files_update_prep(struct io_kiocb *req, |
5634 | const struct io_uring_sqe *sqe) | |
5635 | { | |
6ca56f84 JA |
5636 | if (unlikely(req->ctx->flags & IORING_SETUP_SQPOLL)) |
5637 | return -EINVAL; | |
61710e43 DA |
5638 | if (unlikely(req->flags & (REQ_F_FIXED_FILE | REQ_F_BUFFER_SELECT))) |
5639 | return -EINVAL; | |
5640 | if (sqe->ioprio || sqe->rw_flags) | |
05f3fb3c JA |
5641 | return -EINVAL; |
5642 | ||
5643 | req->files_update.offset = READ_ONCE(sqe->off); | |
5644 | req->files_update.nr_args = READ_ONCE(sqe->len); | |
5645 | if (!req->files_update.nr_args) | |
5646 | return -EINVAL; | |
5647 | req->files_update.arg = READ_ONCE(sqe->addr); | |
5648 | return 0; | |
5649 | } | |
5650 | ||
229a7b63 JA |
5651 | static int io_files_update(struct io_kiocb *req, bool force_nonblock, |
5652 | struct io_comp_state *cs) | |
fbf23849 JA |
5653 | { |
5654 | struct io_ring_ctx *ctx = req->ctx; | |
05f3fb3c JA |
5655 | struct io_uring_files_update up; |
5656 | int ret; | |
fbf23849 | 5657 | |
f86cd20c | 5658 | if (force_nonblock) |
05f3fb3c | 5659 | return -EAGAIN; |
05f3fb3c JA |
5660 | |
5661 | up.offset = req->files_update.offset; | |
5662 | up.fds = req->files_update.arg; | |
5663 | ||
5664 | mutex_lock(&ctx->uring_lock); | |
5665 | ret = __io_sqe_files_update(ctx, &up, req->files_update.nr_args); | |
5666 | mutex_unlock(&ctx->uring_lock); | |
5667 | ||
5668 | if (ret < 0) | |
5669 | req_set_fail_links(req); | |
229a7b63 | 5670 | __io_req_complete(req, ret, 0, cs); |
5262f567 JA |
5671 | return 0; |
5672 | } | |
5673 | ||
bfe76559 | 5674 | static int io_req_prep(struct io_kiocb *req, const struct io_uring_sqe *sqe) |
f67676d1 | 5675 | { |
d625c6ee | 5676 | switch (req->opcode) { |
e781573e | 5677 | case IORING_OP_NOP: |
bfe76559 | 5678 | return 0; |
f67676d1 JA |
5679 | case IORING_OP_READV: |
5680 | case IORING_OP_READ_FIXED: | |
3a6820f2 | 5681 | case IORING_OP_READ: |
bfe76559 | 5682 | return io_read_prep(req, sqe); |
f67676d1 JA |
5683 | case IORING_OP_WRITEV: |
5684 | case IORING_OP_WRITE_FIXED: | |
3a6820f2 | 5685 | case IORING_OP_WRITE: |
bfe76559 | 5686 | return io_write_prep(req, sqe); |
0969e783 | 5687 | case IORING_OP_POLL_ADD: |
bfe76559 | 5688 | return io_poll_add_prep(req, sqe); |
0969e783 | 5689 | case IORING_OP_POLL_REMOVE: |
bfe76559 | 5690 | return io_poll_remove_prep(req, sqe); |
8ed8d3c3 | 5691 | case IORING_OP_FSYNC: |
bfe76559 | 5692 | return io_prep_fsync(req, sqe); |
8ed8d3c3 | 5693 | case IORING_OP_SYNC_FILE_RANGE: |
bfe76559 | 5694 | return io_prep_sfr(req, sqe); |
03b1230c | 5695 | case IORING_OP_SENDMSG: |
fddaface | 5696 | case IORING_OP_SEND: |
bfe76559 | 5697 | return io_sendmsg_prep(req, sqe); |
03b1230c | 5698 | case IORING_OP_RECVMSG: |
fddaface | 5699 | case IORING_OP_RECV: |
bfe76559 | 5700 | return io_recvmsg_prep(req, sqe); |
f499a021 | 5701 | case IORING_OP_CONNECT: |
bfe76559 | 5702 | return io_connect_prep(req, sqe); |
2d28390a | 5703 | case IORING_OP_TIMEOUT: |
bfe76559 | 5704 | return io_timeout_prep(req, sqe, false); |
b29472ee | 5705 | case IORING_OP_TIMEOUT_REMOVE: |
bfe76559 | 5706 | return io_timeout_remove_prep(req, sqe); |
fbf23849 | 5707 | case IORING_OP_ASYNC_CANCEL: |
bfe76559 | 5708 | return io_async_cancel_prep(req, sqe); |
2d28390a | 5709 | case IORING_OP_LINK_TIMEOUT: |
bfe76559 | 5710 | return io_timeout_prep(req, sqe, true); |
8ed8d3c3 | 5711 | case IORING_OP_ACCEPT: |
bfe76559 | 5712 | return io_accept_prep(req, sqe); |
d63d1b5e | 5713 | case IORING_OP_FALLOCATE: |
bfe76559 | 5714 | return io_fallocate_prep(req, sqe); |
15b71abe | 5715 | case IORING_OP_OPENAT: |
bfe76559 | 5716 | return io_openat_prep(req, sqe); |
b5dba59e | 5717 | case IORING_OP_CLOSE: |
bfe76559 | 5718 | return io_close_prep(req, sqe); |
05f3fb3c | 5719 | case IORING_OP_FILES_UPDATE: |
bfe76559 | 5720 | return io_files_update_prep(req, sqe); |
eddc7ef5 | 5721 | case IORING_OP_STATX: |
bfe76559 | 5722 | return io_statx_prep(req, sqe); |
4840e418 | 5723 | case IORING_OP_FADVISE: |
bfe76559 | 5724 | return io_fadvise_prep(req, sqe); |
c1ca757b | 5725 | case IORING_OP_MADVISE: |
bfe76559 | 5726 | return io_madvise_prep(req, sqe); |
cebdb986 | 5727 | case IORING_OP_OPENAT2: |
bfe76559 | 5728 | return io_openat2_prep(req, sqe); |
3e4827b0 | 5729 | case IORING_OP_EPOLL_CTL: |
bfe76559 | 5730 | return io_epoll_ctl_prep(req, sqe); |
7d67af2c | 5731 | case IORING_OP_SPLICE: |
bfe76559 | 5732 | return io_splice_prep(req, sqe); |
ddf0322d | 5733 | case IORING_OP_PROVIDE_BUFFERS: |
bfe76559 | 5734 | return io_provide_buffers_prep(req, sqe); |
067524e9 | 5735 | case IORING_OP_REMOVE_BUFFERS: |
bfe76559 | 5736 | return io_remove_buffers_prep(req, sqe); |
f2a8d5c7 | 5737 | case IORING_OP_TEE: |
bfe76559 | 5738 | return io_tee_prep(req, sqe); |
f67676d1 JA |
5739 | } |
5740 | ||
bfe76559 PB |
5741 | printk_once(KERN_WARNING "io_uring: unhandled opcode %d\n", |
5742 | req->opcode); | |
5743 | return-EINVAL; | |
5744 | } | |
5745 | ||
5746 | static int io_req_defer_prep(struct io_kiocb *req, | |
5747 | const struct io_uring_sqe *sqe) | |
5748 | { | |
bfe76559 PB |
5749 | if (!sqe) |
5750 | return 0; | |
5751 | if (io_alloc_async_data(req)) | |
5752 | return -EAGAIN; | |
bfe76559 | 5753 | return io_req_prep(req, sqe); |
f67676d1 JA |
5754 | } |
5755 | ||
9cf7c104 PB |
5756 | static u32 io_get_sequence(struct io_kiocb *req) |
5757 | { | |
5758 | struct io_kiocb *pos; | |
5759 | struct io_ring_ctx *ctx = req->ctx; | |
5760 | u32 total_submitted, nr_reqs = 1; | |
5761 | ||
5762 | if (req->flags & REQ_F_LINK_HEAD) | |
5763 | list_for_each_entry(pos, &req->link_list, link_list) | |
5764 | nr_reqs++; | |
5765 | ||
5766 | total_submitted = ctx->cached_sq_head - ctx->cached_sq_dropped; | |
5767 | return total_submitted - nr_reqs; | |
5768 | } | |
5769 | ||
3529d8c2 | 5770 | static int io_req_defer(struct io_kiocb *req, const struct io_uring_sqe *sqe) |
de0617e4 | 5771 | { |
a197f664 | 5772 | struct io_ring_ctx *ctx = req->ctx; |
27dc8338 | 5773 | struct io_defer_entry *de; |
f67676d1 | 5774 | int ret; |
9cf7c104 | 5775 | u32 seq; |
de0617e4 | 5776 | |
9d858b21 | 5777 | /* Still need defer if there is pending req in defer list. */ |
9cf7c104 PB |
5778 | if (likely(list_empty_careful(&ctx->defer_list) && |
5779 | !(req->flags & REQ_F_IO_DRAIN))) | |
5780 | return 0; | |
5781 | ||
5782 | seq = io_get_sequence(req); | |
5783 | /* Still a chance to pass the sequence check */ | |
5784 | if (!req_need_defer(req, seq) && list_empty_careful(&ctx->defer_list)) | |
de0617e4 JA |
5785 | return 0; |
5786 | ||
e8c2bc1f | 5787 | if (!req->async_data) { |
650b5481 | 5788 | ret = io_req_defer_prep(req, sqe); |
327d6d96 | 5789 | if (ret) |
650b5481 PB |
5790 | return ret; |
5791 | } | |
cbdcb435 | 5792 | io_prep_async_link(req); |
27dc8338 PB |
5793 | de = kmalloc(sizeof(*de), GFP_KERNEL); |
5794 | if (!de) | |
5795 | return -ENOMEM; | |
2d28390a | 5796 | |
de0617e4 | 5797 | spin_lock_irq(&ctx->completion_lock); |
9cf7c104 | 5798 | if (!req_need_defer(req, seq) && list_empty(&ctx->defer_list)) { |
de0617e4 | 5799 | spin_unlock_irq(&ctx->completion_lock); |
27dc8338 | 5800 | kfree(de); |
ae34817b PB |
5801 | io_queue_async_work(req); |
5802 | return -EIOCBQUEUED; | |
de0617e4 JA |
5803 | } |
5804 | ||
915967f6 | 5805 | trace_io_uring_defer(ctx, req, req->user_data); |
27dc8338 | 5806 | de->req = req; |
9cf7c104 | 5807 | de->seq = seq; |
27dc8338 | 5808 | list_add_tail(&de->list, &ctx->defer_list); |
de0617e4 JA |
5809 | spin_unlock_irq(&ctx->completion_lock); |
5810 | return -EIOCBQUEUED; | |
5811 | } | |
5812 | ||
f573d384 | 5813 | static void io_req_drop_files(struct io_kiocb *req) |
99bc4c38 | 5814 | { |
f573d384 JA |
5815 | struct io_ring_ctx *ctx = req->ctx; |
5816 | unsigned long flags; | |
5817 | ||
5818 | spin_lock_irqsave(&ctx->inflight_lock, flags); | |
5819 | list_del(&req->inflight_entry); | |
5820 | if (waitqueue_active(&ctx->inflight_wait)) | |
5821 | wake_up(&ctx->inflight_wait); | |
5822 | spin_unlock_irqrestore(&ctx->inflight_lock, flags); | |
5823 | req->flags &= ~REQ_F_INFLIGHT; | |
98447d65 JA |
5824 | put_files_struct(req->work.identity->files); |
5825 | put_nsproxy(req->work.identity->nsproxy); | |
dfead8a8 | 5826 | req->work.flags &= ~IO_WQ_WORK_FILES; |
f573d384 | 5827 | } |
99bc4c38 | 5828 | |
3ca405eb | 5829 | static void __io_clean_op(struct io_kiocb *req) |
99bc4c38 | 5830 | { |
0e1b6fe3 PB |
5831 | if (req->flags & REQ_F_BUFFER_SELECTED) { |
5832 | switch (req->opcode) { | |
5833 | case IORING_OP_READV: | |
5834 | case IORING_OP_READ_FIXED: | |
5835 | case IORING_OP_READ: | |
bcda7baa | 5836 | kfree((void *)(unsigned long)req->rw.addr); |
0e1b6fe3 PB |
5837 | break; |
5838 | case IORING_OP_RECVMSG: | |
5839 | case IORING_OP_RECV: | |
bcda7baa | 5840 | kfree(req->sr_msg.kbuf); |
0e1b6fe3 PB |
5841 | break; |
5842 | } | |
5843 | req->flags &= ~REQ_F_BUFFER_SELECTED; | |
99bc4c38 PB |
5844 | } |
5845 | ||
0e1b6fe3 PB |
5846 | if (req->flags & REQ_F_NEED_CLEANUP) { |
5847 | switch (req->opcode) { | |
5848 | case IORING_OP_READV: | |
5849 | case IORING_OP_READ_FIXED: | |
5850 | case IORING_OP_READ: | |
5851 | case IORING_OP_WRITEV: | |
5852 | case IORING_OP_WRITE_FIXED: | |
e8c2bc1f JA |
5853 | case IORING_OP_WRITE: { |
5854 | struct io_async_rw *io = req->async_data; | |
5855 | if (io->free_iovec) | |
5856 | kfree(io->free_iovec); | |
0e1b6fe3 | 5857 | break; |
e8c2bc1f | 5858 | } |
0e1b6fe3 | 5859 | case IORING_OP_RECVMSG: |
e8c2bc1f JA |
5860 | case IORING_OP_SENDMSG: { |
5861 | struct io_async_msghdr *io = req->async_data; | |
5862 | if (io->iov != io->fast_iov) | |
5863 | kfree(io->iov); | |
0e1b6fe3 | 5864 | break; |
e8c2bc1f | 5865 | } |
0e1b6fe3 PB |
5866 | case IORING_OP_SPLICE: |
5867 | case IORING_OP_TEE: | |
5868 | io_put_file(req, req->splice.file_in, | |
5869 | (req->splice.flags & SPLICE_F_FD_IN_FIXED)); | |
5870 | break; | |
f3cd4850 JA |
5871 | case IORING_OP_OPENAT: |
5872 | case IORING_OP_OPENAT2: | |
5873 | if (req->open.filename) | |
5874 | putname(req->open.filename); | |
5875 | break; | |
0e1b6fe3 PB |
5876 | } |
5877 | req->flags &= ~REQ_F_NEED_CLEANUP; | |
99bc4c38 | 5878 | } |
bb175342 | 5879 | |
f573d384 JA |
5880 | if (req->flags & REQ_F_INFLIGHT) |
5881 | io_req_drop_files(req); | |
99bc4c38 PB |
5882 | } |
5883 | ||
c1379e24 PB |
5884 | static int io_issue_sqe(struct io_kiocb *req, bool force_nonblock, |
5885 | struct io_comp_state *cs) | |
2b188cc1 | 5886 | { |
a197f664 | 5887 | struct io_ring_ctx *ctx = req->ctx; |
d625c6ee | 5888 | int ret; |
2b188cc1 | 5889 | |
d625c6ee | 5890 | switch (req->opcode) { |
2b188cc1 | 5891 | case IORING_OP_NOP: |
229a7b63 | 5892 | ret = io_nop(req, cs); |
2b188cc1 JA |
5893 | break; |
5894 | case IORING_OP_READV: | |
edafccee | 5895 | case IORING_OP_READ_FIXED: |
3a6820f2 | 5896 | case IORING_OP_READ: |
a1d7c393 | 5897 | ret = io_read(req, force_nonblock, cs); |
edafccee | 5898 | break; |
3529d8c2 | 5899 | case IORING_OP_WRITEV: |
edafccee | 5900 | case IORING_OP_WRITE_FIXED: |
3a6820f2 | 5901 | case IORING_OP_WRITE: |
a1d7c393 | 5902 | ret = io_write(req, force_nonblock, cs); |
2b188cc1 | 5903 | break; |
c992fe29 | 5904 | case IORING_OP_FSYNC: |
014db007 | 5905 | ret = io_fsync(req, force_nonblock); |
c992fe29 | 5906 | break; |
221c5eb2 | 5907 | case IORING_OP_POLL_ADD: |
014db007 | 5908 | ret = io_poll_add(req); |
221c5eb2 JA |
5909 | break; |
5910 | case IORING_OP_POLL_REMOVE: | |
fc4df999 | 5911 | ret = io_poll_remove(req); |
221c5eb2 | 5912 | break; |
5d17b4a4 | 5913 | case IORING_OP_SYNC_FILE_RANGE: |
014db007 | 5914 | ret = io_sync_file_range(req, force_nonblock); |
5d17b4a4 | 5915 | break; |
0fa03c62 | 5916 | case IORING_OP_SENDMSG: |
062d04d7 PB |
5917 | ret = io_sendmsg(req, force_nonblock, cs); |
5918 | break; | |
fddaface | 5919 | case IORING_OP_SEND: |
062d04d7 | 5920 | ret = io_send(req, force_nonblock, cs); |
0fa03c62 | 5921 | break; |
aa1fa28f | 5922 | case IORING_OP_RECVMSG: |
062d04d7 PB |
5923 | ret = io_recvmsg(req, force_nonblock, cs); |
5924 | break; | |
fddaface | 5925 | case IORING_OP_RECV: |
062d04d7 | 5926 | ret = io_recv(req, force_nonblock, cs); |
aa1fa28f | 5927 | break; |
5262f567 | 5928 | case IORING_OP_TIMEOUT: |
fc4df999 | 5929 | ret = io_timeout(req); |
5262f567 | 5930 | break; |
11365043 | 5931 | case IORING_OP_TIMEOUT_REMOVE: |
fc4df999 | 5932 | ret = io_timeout_remove(req); |
11365043 | 5933 | break; |
17f2fe35 | 5934 | case IORING_OP_ACCEPT: |
229a7b63 | 5935 | ret = io_accept(req, force_nonblock, cs); |
17f2fe35 | 5936 | break; |
f8e85cf2 | 5937 | case IORING_OP_CONNECT: |
229a7b63 | 5938 | ret = io_connect(req, force_nonblock, cs); |
f8e85cf2 | 5939 | break; |
62755e35 | 5940 | case IORING_OP_ASYNC_CANCEL: |
014db007 | 5941 | ret = io_async_cancel(req); |
62755e35 | 5942 | break; |
d63d1b5e | 5943 | case IORING_OP_FALLOCATE: |
014db007 | 5944 | ret = io_fallocate(req, force_nonblock); |
d63d1b5e | 5945 | break; |
15b71abe | 5946 | case IORING_OP_OPENAT: |
014db007 | 5947 | ret = io_openat(req, force_nonblock); |
15b71abe | 5948 | break; |
b5dba59e | 5949 | case IORING_OP_CLOSE: |
229a7b63 | 5950 | ret = io_close(req, force_nonblock, cs); |
b5dba59e | 5951 | break; |
05f3fb3c | 5952 | case IORING_OP_FILES_UPDATE: |
229a7b63 | 5953 | ret = io_files_update(req, force_nonblock, cs); |
05f3fb3c | 5954 | break; |
eddc7ef5 | 5955 | case IORING_OP_STATX: |
014db007 | 5956 | ret = io_statx(req, force_nonblock); |
eddc7ef5 | 5957 | break; |
4840e418 | 5958 | case IORING_OP_FADVISE: |
014db007 | 5959 | ret = io_fadvise(req, force_nonblock); |
4840e418 | 5960 | break; |
c1ca757b | 5961 | case IORING_OP_MADVISE: |
014db007 | 5962 | ret = io_madvise(req, force_nonblock); |
c1ca757b | 5963 | break; |
cebdb986 | 5964 | case IORING_OP_OPENAT2: |
014db007 | 5965 | ret = io_openat2(req, force_nonblock); |
cebdb986 | 5966 | break; |
3e4827b0 | 5967 | case IORING_OP_EPOLL_CTL: |
229a7b63 | 5968 | ret = io_epoll_ctl(req, force_nonblock, cs); |
3e4827b0 | 5969 | break; |
7d67af2c | 5970 | case IORING_OP_SPLICE: |
014db007 | 5971 | ret = io_splice(req, force_nonblock); |
7d67af2c | 5972 | break; |
ddf0322d | 5973 | case IORING_OP_PROVIDE_BUFFERS: |
229a7b63 | 5974 | ret = io_provide_buffers(req, force_nonblock, cs); |
ddf0322d | 5975 | break; |
067524e9 | 5976 | case IORING_OP_REMOVE_BUFFERS: |
229a7b63 | 5977 | ret = io_remove_buffers(req, force_nonblock, cs); |
3e4827b0 | 5978 | break; |
f2a8d5c7 | 5979 | case IORING_OP_TEE: |
f2a8d5c7 PB |
5980 | ret = io_tee(req, force_nonblock); |
5981 | break; | |
2b188cc1 JA |
5982 | default: |
5983 | ret = -EINVAL; | |
5984 | break; | |
5985 | } | |
5986 | ||
def596e9 JA |
5987 | if (ret) |
5988 | return ret; | |
5989 | ||
b532576e JA |
5990 | /* If the op doesn't have a file, we're not polling for it */ |
5991 | if ((ctx->flags & IORING_SETUP_IOPOLL) && req->file) { | |
11ba820b JA |
5992 | const bool in_async = io_wq_current_is_worker(); |
5993 | ||
11ba820b JA |
5994 | /* workqueue context doesn't hold uring_lock, grab it now */ |
5995 | if (in_async) | |
5996 | mutex_lock(&ctx->uring_lock); | |
5997 | ||
def596e9 | 5998 | io_iopoll_req_issued(req); |
11ba820b JA |
5999 | |
6000 | if (in_async) | |
6001 | mutex_unlock(&ctx->uring_lock); | |
def596e9 JA |
6002 | } |
6003 | ||
6004 | return 0; | |
2b188cc1 JA |
6005 | } |
6006 | ||
f4db7182 | 6007 | static struct io_wq_work *io_wq_submit_work(struct io_wq_work *work) |
2b188cc1 JA |
6008 | { |
6009 | struct io_kiocb *req = container_of(work, struct io_kiocb, work); | |
6df1db6b | 6010 | struct io_kiocb *timeout; |
561fb04a | 6011 | int ret = 0; |
2b188cc1 | 6012 | |
6df1db6b PB |
6013 | timeout = io_prep_linked_timeout(req); |
6014 | if (timeout) | |
6015 | io_queue_linked_timeout(timeout); | |
d4c81f38 | 6016 | |
0c9d5ccd JA |
6017 | /* if NO_CANCEL is set, we must still run the work */ |
6018 | if ((work->flags & (IO_WQ_WORK_CANCEL|IO_WQ_WORK_NO_CANCEL)) == | |
6019 | IO_WQ_WORK_CANCEL) { | |
561fb04a | 6020 | ret = -ECANCELED; |
0c9d5ccd | 6021 | } |
31b51510 | 6022 | |
561fb04a | 6023 | if (!ret) { |
561fb04a | 6024 | do { |
c1379e24 | 6025 | ret = io_issue_sqe(req, false, NULL); |
561fb04a JA |
6026 | /* |
6027 | * We can get EAGAIN for polled IO even though we're | |
6028 | * forcing a sync submission from here, since we can't | |
6029 | * wait for request slots on the block side. | |
6030 | */ | |
6031 | if (ret != -EAGAIN) | |
6032 | break; | |
6033 | cond_resched(); | |
6034 | } while (1); | |
6035 | } | |
31b51510 | 6036 | |
561fb04a | 6037 | if (ret) { |
4e88d6e7 | 6038 | req_set_fail_links(req); |
e1e16097 | 6039 | io_req_complete(req, ret); |
edafccee | 6040 | } |
2b188cc1 | 6041 | |
f4db7182 | 6042 | return io_steal_work(req); |
2b188cc1 JA |
6043 | } |
6044 | ||
65e19f54 JA |
6045 | static inline struct file *io_file_from_index(struct io_ring_ctx *ctx, |
6046 | int index) | |
6047 | { | |
6048 | struct fixed_file_table *table; | |
6049 | ||
05f3fb3c | 6050 | table = &ctx->file_data->table[index >> IORING_FILE_TABLE_SHIFT]; |
84695089 | 6051 | return table->files[index & IORING_FILE_TABLE_MASK]; |
65e19f54 JA |
6052 | } |
6053 | ||
8371adf5 PB |
6054 | static struct file *io_file_get(struct io_submit_state *state, |
6055 | struct io_kiocb *req, int fd, bool fixed) | |
09bb8394 | 6056 | { |
a197f664 | 6057 | struct io_ring_ctx *ctx = req->ctx; |
8da11c19 | 6058 | struct file *file; |
09bb8394 | 6059 | |
8da11c19 | 6060 | if (fixed) { |
479f517b | 6061 | if (unlikely((unsigned int)fd >= ctx->nr_user_files)) |
8371adf5 | 6062 | return NULL; |
b7620121 | 6063 | fd = array_index_nospec(fd, ctx->nr_user_files); |
8da11c19 | 6064 | file = io_file_from_index(ctx, fd); |
fd2206e4 | 6065 | if (file) { |
b2e96852 | 6066 | req->fixed_file_refs = &ctx->file_data->node->refs; |
fd2206e4 JA |
6067 | percpu_ref_get(req->fixed_file_refs); |
6068 | } | |
09bb8394 | 6069 | } else { |
c826bd7a | 6070 | trace_io_uring_file_get(ctx, fd); |
8da11c19 | 6071 | file = __io_file_get(state, fd); |
09bb8394 JA |
6072 | } |
6073 | ||
8371adf5 | 6074 | return file; |
09bb8394 JA |
6075 | } |
6076 | ||
8da11c19 | 6077 | static int io_req_set_file(struct io_submit_state *state, struct io_kiocb *req, |
63ff8223 | 6078 | int fd) |
8da11c19 | 6079 | { |
8da11c19 PB |
6080 | bool fixed; |
6081 | ||
63ff8223 | 6082 | fixed = (req->flags & REQ_F_FIXED_FILE) != 0; |
0cdaf760 | 6083 | if (unlikely(!fixed && io_async_submit(req->ctx))) |
8da11c19 PB |
6084 | return -EBADF; |
6085 | ||
8371adf5 PB |
6086 | req->file = io_file_get(state, req, fd, fixed); |
6087 | if (req->file || io_op_defs[req->opcode].needs_file_no_error) | |
f86cd20c | 6088 | return 0; |
8371adf5 | 6089 | return -EBADF; |
f56040b8 PB |
6090 | } |
6091 | ||
2665abfd | 6092 | static enum hrtimer_restart io_link_timeout_fn(struct hrtimer *timer) |
2b188cc1 | 6093 | { |
ad8a48ac JA |
6094 | struct io_timeout_data *data = container_of(timer, |
6095 | struct io_timeout_data, timer); | |
6096 | struct io_kiocb *req = data->req; | |
2665abfd JA |
6097 | struct io_ring_ctx *ctx = req->ctx; |
6098 | struct io_kiocb *prev = NULL; | |
6099 | unsigned long flags; | |
2665abfd JA |
6100 | |
6101 | spin_lock_irqsave(&ctx->completion_lock, flags); | |
6102 | ||
6103 | /* | |
6104 | * We don't expect the list to be empty, that will only happen if we | |
6105 | * race with the completion of the linked work. | |
6106 | */ | |
4493233e PB |
6107 | if (!list_empty(&req->link_list)) { |
6108 | prev = list_entry(req->link_list.prev, struct io_kiocb, | |
6109 | link_list); | |
5d960724 | 6110 | if (refcount_inc_not_zero(&prev->refs)) { |
4493233e | 6111 | list_del_init(&req->link_list); |
5d960724 JA |
6112 | prev->flags &= ~REQ_F_LINK_TIMEOUT; |
6113 | } else | |
76a46e06 | 6114 | prev = NULL; |
2665abfd JA |
6115 | } |
6116 | ||
6117 | spin_unlock_irqrestore(&ctx->completion_lock, flags); | |
6118 | ||
6119 | if (prev) { | |
4e88d6e7 | 6120 | req_set_fail_links(prev); |
014db007 | 6121 | io_async_find_and_cancel(ctx, req, prev->user_data, -ETIME); |
76a46e06 | 6122 | io_put_req(prev); |
47f46768 | 6123 | } else { |
e1e16097 | 6124 | io_req_complete(req, -ETIME); |
2665abfd | 6125 | } |
2665abfd JA |
6126 | return HRTIMER_NORESTART; |
6127 | } | |
6128 | ||
7271ef3a | 6129 | static void __io_queue_linked_timeout(struct io_kiocb *req) |
2665abfd | 6130 | { |
76a46e06 JA |
6131 | /* |
6132 | * If the list is now empty, then our linked request finished before | |
6133 | * we got a chance to setup the timer | |
6134 | */ | |
4493233e | 6135 | if (!list_empty(&req->link_list)) { |
e8c2bc1f | 6136 | struct io_timeout_data *data = req->async_data; |
94ae5e77 | 6137 | |
ad8a48ac JA |
6138 | data->timer.function = io_link_timeout_fn; |
6139 | hrtimer_start(&data->timer, timespec64_to_ktime(data->ts), | |
6140 | data->mode); | |
2665abfd | 6141 | } |
7271ef3a JA |
6142 | } |
6143 | ||
6144 | static void io_queue_linked_timeout(struct io_kiocb *req) | |
6145 | { | |
6146 | struct io_ring_ctx *ctx = req->ctx; | |
6147 | ||
6148 | spin_lock_irq(&ctx->completion_lock); | |
6149 | __io_queue_linked_timeout(req); | |
76a46e06 | 6150 | spin_unlock_irq(&ctx->completion_lock); |
2665abfd | 6151 | |
2665abfd | 6152 | /* drop submission reference */ |
76a46e06 JA |
6153 | io_put_req(req); |
6154 | } | |
2665abfd | 6155 | |
ad8a48ac | 6156 | static struct io_kiocb *io_prep_linked_timeout(struct io_kiocb *req) |
2665abfd JA |
6157 | { |
6158 | struct io_kiocb *nxt; | |
6159 | ||
dea3b49c | 6160 | if (!(req->flags & REQ_F_LINK_HEAD)) |
2665abfd | 6161 | return NULL; |
6df1db6b | 6162 | if (req->flags & REQ_F_LINK_TIMEOUT) |
d7718a9d | 6163 | return NULL; |
2665abfd | 6164 | |
4493233e PB |
6165 | nxt = list_first_entry_or_null(&req->link_list, struct io_kiocb, |
6166 | link_list); | |
d625c6ee | 6167 | if (!nxt || nxt->opcode != IORING_OP_LINK_TIMEOUT) |
76a46e06 | 6168 | return NULL; |
2665abfd | 6169 | |
76a46e06 | 6170 | req->flags |= REQ_F_LINK_TIMEOUT; |
76a46e06 | 6171 | return nxt; |
2665abfd JA |
6172 | } |
6173 | ||
c1379e24 | 6174 | static void __io_queue_sqe(struct io_kiocb *req, struct io_comp_state *cs) |
2b188cc1 | 6175 | { |
4a0a7a18 | 6176 | struct io_kiocb *linked_timeout; |
4bc4494e | 6177 | struct io_kiocb *nxt; |
193155c8 | 6178 | const struct cred *old_creds = NULL; |
e0c5c576 | 6179 | int ret; |
2b188cc1 | 6180 | |
4a0a7a18 JA |
6181 | again: |
6182 | linked_timeout = io_prep_linked_timeout(req); | |
6183 | ||
2e5aa6cb PB |
6184 | if ((req->flags & REQ_F_WORK_INITIALIZED) && |
6185 | (req->work.flags & IO_WQ_WORK_CREDS) && | |
98447d65 | 6186 | req->work.identity->creds != current_cred()) { |
193155c8 JA |
6187 | if (old_creds) |
6188 | revert_creds(old_creds); | |
98447d65 | 6189 | if (old_creds == req->work.identity->creds) |
193155c8 JA |
6190 | old_creds = NULL; /* restored original creds */ |
6191 | else | |
98447d65 | 6192 | old_creds = override_creds(req->work.identity->creds); |
193155c8 JA |
6193 | } |
6194 | ||
c1379e24 | 6195 | ret = io_issue_sqe(req, true, cs); |
491381ce JA |
6196 | |
6197 | /* | |
6198 | * We async punt it if the file wasn't marked NOWAIT, or if the file | |
6199 | * doesn't support non-blocking read/write attempts | |
6200 | */ | |
24c74678 | 6201 | if (ret == -EAGAIN && !(req->flags & REQ_F_NOWAIT)) { |
f063c547 | 6202 | if (!io_arm_poll_handler(req)) { |
86a761f8 | 6203 | punt: |
f063c547 PB |
6204 | /* |
6205 | * Queued up for async execution, worker will release | |
6206 | * submit reference when the iocb is actually submitted. | |
6207 | */ | |
6208 | io_queue_async_work(req); | |
2b188cc1 | 6209 | } |
bbad27b2 | 6210 | |
f063c547 PB |
6211 | if (linked_timeout) |
6212 | io_queue_linked_timeout(linked_timeout); | |
4bc4494e | 6213 | goto exit; |
2b188cc1 | 6214 | } |
e65ef56d | 6215 | |
652532ad | 6216 | if (unlikely(ret)) { |
652532ad PB |
6217 | /* un-prep timeout, so it'll be killed as any other linked */ |
6218 | req->flags &= ~REQ_F_LINK_TIMEOUT; | |
4e88d6e7 | 6219 | req_set_fail_links(req); |
e65ef56d | 6220 | io_put_req(req); |
e1e16097 | 6221 | io_req_complete(req, ret); |
652532ad | 6222 | goto exit; |
9e645e11 | 6223 | } |
652532ad PB |
6224 | |
6225 | /* drop submission reference */ | |
6226 | nxt = io_put_req_find_next(req); | |
6227 | if (linked_timeout) | |
6228 | io_queue_linked_timeout(linked_timeout); | |
6229 | ||
4a0a7a18 JA |
6230 | if (nxt) { |
6231 | req = nxt; | |
86a761f8 PB |
6232 | |
6233 | if (req->flags & REQ_F_FORCE_ASYNC) | |
6234 | goto punt; | |
4a0a7a18 JA |
6235 | goto again; |
6236 | } | |
4bc4494e | 6237 | exit: |
193155c8 JA |
6238 | if (old_creds) |
6239 | revert_creds(old_creds); | |
2b188cc1 JA |
6240 | } |
6241 | ||
f13fad7b JA |
6242 | static void io_queue_sqe(struct io_kiocb *req, const struct io_uring_sqe *sqe, |
6243 | struct io_comp_state *cs) | |
4fe2c963 JL |
6244 | { |
6245 | int ret; | |
6246 | ||
3529d8c2 | 6247 | ret = io_req_defer(req, sqe); |
4fe2c963 JL |
6248 | if (ret) { |
6249 | if (ret != -EIOCBQUEUED) { | |
1118591a | 6250 | fail_req: |
4e88d6e7 | 6251 | req_set_fail_links(req); |
e1e16097 JA |
6252 | io_put_req(req); |
6253 | io_req_complete(req, ret); | |
4fe2c963 | 6254 | } |
2550878f | 6255 | } else if (req->flags & REQ_F_FORCE_ASYNC) { |
e8c2bc1f | 6256 | if (!req->async_data) { |
bd2ab18a | 6257 | ret = io_req_defer_prep(req, sqe); |
327d6d96 | 6258 | if (unlikely(ret)) |
bd2ab18a PB |
6259 | goto fail_req; |
6260 | } | |
6261 | ||
ce35a47a JA |
6262 | /* |
6263 | * Never try inline submit of IOSQE_ASYNC is set, go straight | |
6264 | * to async execution. | |
6265 | */ | |
3e863ea3 | 6266 | io_req_init_async(req); |
ce35a47a JA |
6267 | req->work.flags |= IO_WQ_WORK_CONCURRENT; |
6268 | io_queue_async_work(req); | |
6269 | } else { | |
c1379e24 PB |
6270 | if (sqe) { |
6271 | ret = io_req_prep(req, sqe); | |
6272 | if (unlikely(ret)) | |
6273 | goto fail_req; | |
6274 | } | |
6275 | __io_queue_sqe(req, cs); | |
ce35a47a | 6276 | } |
4fe2c963 JL |
6277 | } |
6278 | ||
f13fad7b JA |
6279 | static inline void io_queue_link_head(struct io_kiocb *req, |
6280 | struct io_comp_state *cs) | |
4fe2c963 | 6281 | { |
94ae5e77 | 6282 | if (unlikely(req->flags & REQ_F_FAIL_LINK)) { |
e1e16097 JA |
6283 | io_put_req(req); |
6284 | io_req_complete(req, -ECANCELED); | |
1b4a51b6 | 6285 | } else |
f13fad7b | 6286 | io_queue_sqe(req, NULL, cs); |
4fe2c963 JL |
6287 | } |
6288 | ||
1d4240cc | 6289 | static int io_submit_sqe(struct io_kiocb *req, const struct io_uring_sqe *sqe, |
f13fad7b | 6290 | struct io_kiocb **link, struct io_comp_state *cs) |
9e645e11 | 6291 | { |
a197f664 | 6292 | struct io_ring_ctx *ctx = req->ctx; |
ef4ff581 | 6293 | int ret; |
9e645e11 | 6294 | |
9e645e11 JA |
6295 | /* |
6296 | * If we already have a head request, queue this one for async | |
6297 | * submittal once the head completes. If we don't have a head but | |
6298 | * IOSQE_IO_LINK is set in the sqe, start a new head. This one will be | |
6299 | * submitted sync once the chain is complete. If none of those | |
6300 | * conditions are true (normal request), then just queue it. | |
6301 | */ | |
6302 | if (*link) { | |
9d76377f | 6303 | struct io_kiocb *head = *link; |
4e88d6e7 | 6304 | |
8cdf2193 PB |
6305 | /* |
6306 | * Taking sequential execution of a link, draining both sides | |
6307 | * of the link also fullfils IOSQE_IO_DRAIN semantics for all | |
6308 | * requests in the link. So, it drains the head and the | |
6309 | * next after the link request. The last one is done via | |
6310 | * drain_next flag to persist the effect across calls. | |
6311 | */ | |
ef4ff581 | 6312 | if (req->flags & REQ_F_IO_DRAIN) { |
711be031 PB |
6313 | head->flags |= REQ_F_IO_DRAIN; |
6314 | ctx->drain_next = 1; | |
6315 | } | |
3529d8c2 | 6316 | ret = io_req_defer_prep(req, sqe); |
327d6d96 | 6317 | if (unlikely(ret)) { |
4e88d6e7 | 6318 | /* fail even hard links since we don't submit */ |
9d76377f | 6319 | head->flags |= REQ_F_FAIL_LINK; |
1d4240cc | 6320 | return ret; |
2d28390a | 6321 | } |
9d76377f PB |
6322 | trace_io_uring_link(ctx, req, head); |
6323 | list_add_tail(&req->link_list, &head->link_list); | |
32fe525b PB |
6324 | |
6325 | /* last request of a link, enqueue the link */ | |
ef4ff581 | 6326 | if (!(req->flags & (REQ_F_LINK | REQ_F_HARDLINK))) { |
f13fad7b | 6327 | io_queue_link_head(head, cs); |
32fe525b PB |
6328 | *link = NULL; |
6329 | } | |
9e645e11 | 6330 | } else { |
711be031 PB |
6331 | if (unlikely(ctx->drain_next)) { |
6332 | req->flags |= REQ_F_IO_DRAIN; | |
ef4ff581 | 6333 | ctx->drain_next = 0; |
711be031 | 6334 | } |
ef4ff581 | 6335 | if (req->flags & (REQ_F_LINK | REQ_F_HARDLINK)) { |
dea3b49c | 6336 | req->flags |= REQ_F_LINK_HEAD; |
711be031 | 6337 | INIT_LIST_HEAD(&req->link_list); |
f1d96a8f | 6338 | |
711be031 | 6339 | ret = io_req_defer_prep(req, sqe); |
327d6d96 | 6340 | if (unlikely(ret)) |
711be031 PB |
6341 | req->flags |= REQ_F_FAIL_LINK; |
6342 | *link = req; | |
6343 | } else { | |
f13fad7b | 6344 | io_queue_sqe(req, sqe, cs); |
711be031 | 6345 | } |
9e645e11 | 6346 | } |
2e6e1fde | 6347 | |
1d4240cc | 6348 | return 0; |
9e645e11 JA |
6349 | } |
6350 | ||
9a56a232 JA |
6351 | /* |
6352 | * Batched submission is done, ensure local IO is flushed out. | |
6353 | */ | |
6354 | static void io_submit_state_end(struct io_submit_state *state) | |
6355 | { | |
f13fad7b JA |
6356 | if (!list_empty(&state->comp.list)) |
6357 | io_submit_flush_completions(&state->comp); | |
9a56a232 | 6358 | blk_finish_plug(&state->plug); |
9f13c35b | 6359 | io_state_file_put(state); |
2579f913 | 6360 | if (state->free_reqs) |
6c8a3134 | 6361 | kmem_cache_free_bulk(req_cachep, state->free_reqs, state->reqs); |
9a56a232 JA |
6362 | } |
6363 | ||
6364 | /* | |
6365 | * Start submission side cache. | |
6366 | */ | |
6367 | static void io_submit_state_start(struct io_submit_state *state, | |
013538bd | 6368 | struct io_ring_ctx *ctx, unsigned int max_ios) |
9a56a232 JA |
6369 | { |
6370 | blk_start_plug(&state->plug); | |
013538bd JA |
6371 | state->comp.nr = 0; |
6372 | INIT_LIST_HEAD(&state->comp.list); | |
6373 | state->comp.ctx = ctx; | |
2579f913 | 6374 | state->free_reqs = 0; |
9a56a232 JA |
6375 | state->file = NULL; |
6376 | state->ios_left = max_ios; | |
6377 | } | |
6378 | ||
2b188cc1 JA |
6379 | static void io_commit_sqring(struct io_ring_ctx *ctx) |
6380 | { | |
75b28aff | 6381 | struct io_rings *rings = ctx->rings; |
2b188cc1 | 6382 | |
caf582c6 PB |
6383 | /* |
6384 | * Ensure any loads from the SQEs are done at this point, | |
6385 | * since once we write the new head, the application could | |
6386 | * write new data to them. | |
6387 | */ | |
6388 | smp_store_release(&rings->sq.head, ctx->cached_sq_head); | |
2b188cc1 JA |
6389 | } |
6390 | ||
2b188cc1 | 6391 | /* |
3529d8c2 | 6392 | * Fetch an sqe, if one is available. Note that sqe_ptr will point to memory |
2b188cc1 JA |
6393 | * that is mapped by userspace. This means that care needs to be taken to |
6394 | * ensure that reads are stable, as we cannot rely on userspace always | |
6395 | * being a good citizen. If members of the sqe are validated and then later | |
6396 | * used, it's important that those reads are done through READ_ONCE() to | |
6397 | * prevent a re-load down the line. | |
6398 | */ | |
709b302f | 6399 | static const struct io_uring_sqe *io_get_sqe(struct io_ring_ctx *ctx) |
2b188cc1 | 6400 | { |
75b28aff | 6401 | u32 *sq_array = ctx->sq_array; |
2b188cc1 JA |
6402 | unsigned head; |
6403 | ||
6404 | /* | |
6405 | * The cached sq head (or cq tail) serves two purposes: | |
6406 | * | |
6407 | * 1) allows us to batch the cost of updating the user visible | |
6408 | * head updates. | |
6409 | * 2) allows the kernel side to track the head on its own, even | |
6410 | * though the application is the one updating it. | |
6411 | */ | |
ee7d46d9 | 6412 | head = READ_ONCE(sq_array[ctx->cached_sq_head & ctx->sq_mask]); |
709b302f PB |
6413 | if (likely(head < ctx->sq_entries)) |
6414 | return &ctx->sq_sqes[head]; | |
2b188cc1 JA |
6415 | |
6416 | /* drop invalid entries */ | |
498ccd9e | 6417 | ctx->cached_sq_dropped++; |
ee7d46d9 | 6418 | WRITE_ONCE(ctx->rings->sq_dropped, ctx->cached_sq_dropped); |
709b302f PB |
6419 | return NULL; |
6420 | } | |
6421 | ||
6422 | static inline void io_consume_sqe(struct io_ring_ctx *ctx) | |
6423 | { | |
6424 | ctx->cached_sq_head++; | |
2b188cc1 JA |
6425 | } |
6426 | ||
21b55dbc SG |
6427 | /* |
6428 | * Check SQE restrictions (opcode and flags). | |
6429 | * | |
6430 | * Returns 'true' if SQE is allowed, 'false' otherwise. | |
6431 | */ | |
6432 | static inline bool io_check_restriction(struct io_ring_ctx *ctx, | |
6433 | struct io_kiocb *req, | |
6434 | unsigned int sqe_flags) | |
6435 | { | |
6436 | if (!ctx->restricted) | |
6437 | return true; | |
6438 | ||
6439 | if (!test_bit(req->opcode, ctx->restrictions.sqe_op)) | |
6440 | return false; | |
6441 | ||
6442 | if ((sqe_flags & ctx->restrictions.sqe_flags_required) != | |
6443 | ctx->restrictions.sqe_flags_required) | |
6444 | return false; | |
6445 | ||
6446 | if (sqe_flags & ~(ctx->restrictions.sqe_flags_allowed | | |
6447 | ctx->restrictions.sqe_flags_required)) | |
6448 | return false; | |
6449 | ||
6450 | return true; | |
6451 | } | |
6452 | ||
ef4ff581 PB |
6453 | #define SQE_VALID_FLAGS (IOSQE_FIXED_FILE|IOSQE_IO_DRAIN|IOSQE_IO_LINK| \ |
6454 | IOSQE_IO_HARDLINK | IOSQE_ASYNC | \ | |
6455 | IOSQE_BUFFER_SELECT) | |
6456 | ||
6457 | static int io_init_req(struct io_ring_ctx *ctx, struct io_kiocb *req, | |
6458 | const struct io_uring_sqe *sqe, | |
0cdaf760 | 6459 | struct io_submit_state *state) |
0553b8bd | 6460 | { |
ef4ff581 | 6461 | unsigned int sqe_flags; |
71b547c0 | 6462 | int id, ret; |
ef4ff581 | 6463 | |
0553b8bd PB |
6464 | req->opcode = READ_ONCE(sqe->opcode); |
6465 | req->user_data = READ_ONCE(sqe->user_data); | |
e8c2bc1f | 6466 | req->async_data = NULL; |
0553b8bd PB |
6467 | req->file = NULL; |
6468 | req->ctx = ctx; | |
6469 | req->flags = 0; | |
6470 | /* one is dropped after submission, the other at completion */ | |
6471 | refcount_set(&req->refs, 2); | |
4dd2824d | 6472 | req->task = current; |
0553b8bd | 6473 | req->result = 0; |
ef4ff581 PB |
6474 | |
6475 | if (unlikely(req->opcode >= IORING_OP_LAST)) | |
6476 | return -EINVAL; | |
6477 | ||
9d8426a0 JA |
6478 | if (unlikely(io_sq_thread_acquire_mm(ctx, req))) |
6479 | return -EFAULT; | |
ef4ff581 PB |
6480 | |
6481 | sqe_flags = READ_ONCE(sqe->flags); | |
6482 | /* enforce forwards compatibility on users */ | |
6483 | if (unlikely(sqe_flags & ~SQE_VALID_FLAGS)) | |
6484 | return -EINVAL; | |
6485 | ||
21b55dbc SG |
6486 | if (unlikely(!io_check_restriction(ctx, req, sqe_flags))) |
6487 | return -EACCES; | |
6488 | ||
ef4ff581 PB |
6489 | if ((sqe_flags & IOSQE_BUFFER_SELECT) && |
6490 | !io_op_defs[req->opcode].buffer_select) | |
6491 | return -EOPNOTSUPP; | |
6492 | ||
6493 | id = READ_ONCE(sqe->personality); | |
6494 | if (id) { | |
1e6fa521 JA |
6495 | struct io_identity *iod; |
6496 | ||
1e6fa521 JA |
6497 | iod = idr_find(&ctx->personality_idr, id); |
6498 | if (unlikely(!iod)) | |
ef4ff581 | 6499 | return -EINVAL; |
1e6fa521 | 6500 | refcount_inc(&iod->count); |
ec99ca6c PB |
6501 | |
6502 | __io_req_init_async(req); | |
1e6fa521 JA |
6503 | get_cred(iod->creds); |
6504 | req->work.identity = iod; | |
dfead8a8 | 6505 | req->work.flags |= IO_WQ_WORK_CREDS; |
ef4ff581 PB |
6506 | } |
6507 | ||
6508 | /* same numerical values with corresponding REQ_F_*, safe to copy */ | |
c11368a5 | 6509 | req->flags |= sqe_flags; |
ef4ff581 | 6510 | |
63ff8223 JA |
6511 | if (!io_op_defs[req->opcode].needs_file) |
6512 | return 0; | |
6513 | ||
71b547c0 PB |
6514 | ret = io_req_set_file(state, req, READ_ONCE(sqe->fd)); |
6515 | state->ios_left--; | |
6516 | return ret; | |
0553b8bd PB |
6517 | } |
6518 | ||
0f212204 | 6519 | static int io_submit_sqes(struct io_ring_ctx *ctx, unsigned int nr) |
6c271ce2 | 6520 | { |
ac8691c4 | 6521 | struct io_submit_state state; |
9e645e11 | 6522 | struct io_kiocb *link = NULL; |
9e645e11 | 6523 | int i, submitted = 0; |
6c271ce2 | 6524 | |
c4a2ed72 | 6525 | /* if we have a backlog and couldn't flush it all, return BUSY */ |
ad3eb2c8 JA |
6526 | if (test_bit(0, &ctx->sq_check_overflow)) { |
6527 | if (!list_empty(&ctx->cq_overflow_list) && | |
e6c8aa9a | 6528 | !io_cqring_overflow_flush(ctx, false, NULL, NULL)) |
ad3eb2c8 JA |
6529 | return -EBUSY; |
6530 | } | |
6c271ce2 | 6531 | |
ee7d46d9 PB |
6532 | /* make sure SQ entry isn't read before tail */ |
6533 | nr = min3(nr, ctx->sq_entries, io_sqring_entries(ctx)); | |
9ef4f124 | 6534 | |
2b85edfc PB |
6535 | if (!percpu_ref_tryget_many(&ctx->refs, nr)) |
6536 | return -EAGAIN; | |
6c271ce2 | 6537 | |
d8a6df10 | 6538 | percpu_counter_add(¤t->io_uring->inflight, nr); |
faf7b51c | 6539 | refcount_add(nr, ¤t->usage); |
6c271ce2 | 6540 | |
013538bd | 6541 | io_submit_state_start(&state, ctx, nr); |
b14cca0c | 6542 | |
6c271ce2 | 6543 | for (i = 0; i < nr; i++) { |
3529d8c2 | 6544 | const struct io_uring_sqe *sqe; |
196be95c | 6545 | struct io_kiocb *req; |
1cb1edb2 | 6546 | int err; |
fb5ccc98 | 6547 | |
b1e50e54 PB |
6548 | sqe = io_get_sqe(ctx); |
6549 | if (unlikely(!sqe)) { | |
6550 | io_consume_sqe(ctx); | |
6551 | break; | |
6552 | } | |
ac8691c4 | 6553 | req = io_alloc_req(ctx, &state); |
196be95c PB |
6554 | if (unlikely(!req)) { |
6555 | if (!submitted) | |
6556 | submitted = -EAGAIN; | |
fb5ccc98 | 6557 | break; |
196be95c | 6558 | } |
709b302f | 6559 | io_consume_sqe(ctx); |
d3656344 JA |
6560 | /* will complete beyond this point, count as submitted */ |
6561 | submitted++; | |
6562 | ||
692d8363 | 6563 | err = io_init_req(ctx, req, sqe, &state); |
ef4ff581 | 6564 | if (unlikely(err)) { |
1cb1edb2 | 6565 | fail_req: |
e1e16097 JA |
6566 | io_put_req(req); |
6567 | io_req_complete(req, err); | |
196be95c PB |
6568 | break; |
6569 | } | |
fb5ccc98 | 6570 | |
354420f7 | 6571 | trace_io_uring_submit_sqe(ctx, req->opcode, req->user_data, |
0cdaf760 | 6572 | true, io_async_submit(ctx)); |
f13fad7b | 6573 | err = io_submit_sqe(req, sqe, &link, &state.comp); |
1d4240cc PB |
6574 | if (err) |
6575 | goto fail_req; | |
6c271ce2 JA |
6576 | } |
6577 | ||
9466f437 PB |
6578 | if (unlikely(submitted != nr)) { |
6579 | int ref_used = (submitted == -EAGAIN) ? 0 : submitted; | |
d8a6df10 JA |
6580 | struct io_uring_task *tctx = current->io_uring; |
6581 | int unused = nr - ref_used; | |
9466f437 | 6582 | |
d8a6df10 JA |
6583 | percpu_ref_put_many(&ctx->refs, unused); |
6584 | percpu_counter_sub(&tctx->inflight, unused); | |
6585 | put_task_struct_many(current, unused); | |
9466f437 | 6586 | } |
9e645e11 | 6587 | if (link) |
f13fad7b | 6588 | io_queue_link_head(link, &state.comp); |
ac8691c4 | 6589 | io_submit_state_end(&state); |
6c271ce2 | 6590 | |
ae9428ca PB |
6591 | /* Commit SQ ring head once we've consumed and submitted all SQEs */ |
6592 | io_commit_sqring(ctx); | |
6593 | ||
6c271ce2 JA |
6594 | return submitted; |
6595 | } | |
6596 | ||
23b3628e XW |
6597 | static inline void io_ring_set_wakeup_flag(struct io_ring_ctx *ctx) |
6598 | { | |
6599 | /* Tell userspace we may need a wakeup call */ | |
6600 | spin_lock_irq(&ctx->completion_lock); | |
6601 | ctx->rings->sq_flags |= IORING_SQ_NEED_WAKEUP; | |
6602 | spin_unlock_irq(&ctx->completion_lock); | |
6603 | } | |
6604 | ||
6605 | static inline void io_ring_clear_wakeup_flag(struct io_ring_ctx *ctx) | |
6606 | { | |
6607 | spin_lock_irq(&ctx->completion_lock); | |
6608 | ctx->rings->sq_flags &= ~IORING_SQ_NEED_WAKEUP; | |
6609 | spin_unlock_irq(&ctx->completion_lock); | |
6610 | } | |
6611 | ||
3f0e64d0 JA |
6612 | static int io_sq_wake_function(struct wait_queue_entry *wqe, unsigned mode, |
6613 | int sync, void *key) | |
6c271ce2 | 6614 | { |
3f0e64d0 JA |
6615 | struct io_ring_ctx *ctx = container_of(wqe, struct io_ring_ctx, sqo_wait_entry); |
6616 | int ret; | |
6617 | ||
6618 | ret = autoremove_wake_function(wqe, mode, sync, key); | |
6619 | if (ret) { | |
6620 | unsigned long flags; | |
6621 | ||
6622 | spin_lock_irqsave(&ctx->completion_lock, flags); | |
6623 | ctx->rings->sq_flags &= ~IORING_SQ_NEED_WAKEUP; | |
6624 | spin_unlock_irqrestore(&ctx->completion_lock, flags); | |
6625 | } | |
6626 | return ret; | |
6627 | } | |
6628 | ||
c8d1ba58 JA |
6629 | enum sq_ret { |
6630 | SQT_IDLE = 1, | |
6631 | SQT_SPIN = 2, | |
6632 | SQT_DID_WORK = 4, | |
6633 | }; | |
6634 | ||
6635 | static enum sq_ret __io_sq_thread(struct io_ring_ctx *ctx, | |
e95eee2d | 6636 | unsigned long start_jiffies, bool cap_entries) |
6c271ce2 | 6637 | { |
c8d1ba58 | 6638 | unsigned long timeout = start_jiffies + ctx->sq_thread_idle; |
534ca6d6 | 6639 | struct io_sq_data *sqd = ctx->sq_data; |
c8d1ba58 | 6640 | unsigned int to_submit; |
bdcd3eab | 6641 | int ret = 0; |
6c271ce2 | 6642 | |
c8d1ba58 JA |
6643 | again: |
6644 | if (!list_empty(&ctx->iopoll_list)) { | |
6645 | unsigned nr_events = 0; | |
a4c0b3de | 6646 | |
c8d1ba58 JA |
6647 | mutex_lock(&ctx->uring_lock); |
6648 | if (!list_empty(&ctx->iopoll_list) && !need_resched()) | |
6649 | io_do_iopoll(ctx, &nr_events, 0); | |
6650 | mutex_unlock(&ctx->uring_lock); | |
6651 | } | |
6c271ce2 | 6652 | |
c8d1ba58 | 6653 | to_submit = io_sqring_entries(ctx); |
6c271ce2 | 6654 | |
c8d1ba58 JA |
6655 | /* |
6656 | * If submit got -EBUSY, flag us as needing the application | |
6657 | * to enter the kernel to reap and flush events. | |
6658 | */ | |
6659 | if (!to_submit || ret == -EBUSY || need_resched()) { | |
6660 | /* | |
6661 | * Drop cur_mm before scheduling, we can't hold it for | |
6662 | * long periods (or over schedule()). Do this before | |
6663 | * adding ourselves to the waitqueue, as the unuse/drop | |
6664 | * may sleep. | |
6665 | */ | |
6666 | io_sq_thread_drop_mm(); | |
6c271ce2 | 6667 | |
c8d1ba58 JA |
6668 | /* |
6669 | * We're polling. If we're within the defined idle | |
6670 | * period, then let us spin without work before going | |
6671 | * to sleep. The exception is if we got EBUSY doing | |
6672 | * more IO, we should wait for the application to | |
6673 | * reap events and wake us up. | |
6674 | */ | |
6675 | if (!list_empty(&ctx->iopoll_list) || need_resched() || | |
6676 | (!time_after(jiffies, timeout) && ret != -EBUSY && | |
6677 | !percpu_ref_is_dying(&ctx->refs))) | |
6678 | return SQT_SPIN; | |
6c271ce2 | 6679 | |
534ca6d6 | 6680 | prepare_to_wait(&sqd->wait, &ctx->sqo_wait_entry, |
c8d1ba58 | 6681 | TASK_INTERRUPTIBLE); |
6c271ce2 | 6682 | |
c8d1ba58 JA |
6683 | /* |
6684 | * While doing polled IO, before going to sleep, we need | |
6685 | * to check if there are new reqs added to iopoll_list, | |
6686 | * it is because reqs may have been punted to io worker | |
6687 | * and will be added to iopoll_list later, hence check | |
6688 | * the iopoll_list again. | |
6689 | */ | |
6690 | if ((ctx->flags & IORING_SETUP_IOPOLL) && | |
6691 | !list_empty_careful(&ctx->iopoll_list)) { | |
534ca6d6 | 6692 | finish_wait(&sqd->wait, &ctx->sqo_wait_entry); |
c8d1ba58 | 6693 | goto again; |
6c271ce2 JA |
6694 | } |
6695 | ||
fb5ccc98 | 6696 | to_submit = io_sqring_entries(ctx); |
c8d1ba58 JA |
6697 | if (!to_submit || ret == -EBUSY) |
6698 | return SQT_IDLE; | |
6699 | } | |
c1edbf5f | 6700 | |
534ca6d6 | 6701 | finish_wait(&sqd->wait, &ctx->sqo_wait_entry); |
c8d1ba58 | 6702 | io_ring_clear_wakeup_flag(ctx); |
7143b5ac | 6703 | |
e95eee2d JA |
6704 | /* if we're handling multiple rings, cap submit size for fairness */ |
6705 | if (cap_entries && to_submit > 8) | |
6706 | to_submit = 8; | |
6707 | ||
c8d1ba58 JA |
6708 | mutex_lock(&ctx->uring_lock); |
6709 | if (likely(!percpu_ref_is_dying(&ctx->refs))) | |
6710 | ret = io_submit_sqes(ctx, to_submit); | |
6711 | mutex_unlock(&ctx->uring_lock); | |
90554200 JA |
6712 | |
6713 | if (!io_sqring_full(ctx) && wq_has_sleeper(&ctx->sqo_sq_wait)) | |
6714 | wake_up(&ctx->sqo_sq_wait); | |
6715 | ||
c8d1ba58 JA |
6716 | return SQT_DID_WORK; |
6717 | } | |
6c271ce2 | 6718 | |
69fb2131 JA |
6719 | static void io_sqd_init_new(struct io_sq_data *sqd) |
6720 | { | |
6721 | struct io_ring_ctx *ctx; | |
6722 | ||
6723 | while (!list_empty(&sqd->ctx_new_list)) { | |
6724 | ctx = list_first_entry(&sqd->ctx_new_list, struct io_ring_ctx, sqd_list); | |
6725 | init_wait(&ctx->sqo_wait_entry); | |
6726 | ctx->sqo_wait_entry.func = io_sq_wake_function; | |
6727 | list_move_tail(&ctx->sqd_list, &sqd->ctx_list); | |
6728 | complete(&ctx->sq_thread_comp); | |
6729 | } | |
6730 | } | |
6731 | ||
c8d1ba58 JA |
6732 | static int io_sq_thread(void *data) |
6733 | { | |
91d8f519 | 6734 | struct cgroup_subsys_state *cur_css = NULL; |
69fb2131 JA |
6735 | const struct cred *old_cred = NULL; |
6736 | struct io_sq_data *sqd = data; | |
6737 | struct io_ring_ctx *ctx; | |
c8d1ba58 | 6738 | unsigned long start_jiffies; |
6c271ce2 | 6739 | |
69fb2131 JA |
6740 | start_jiffies = jiffies; |
6741 | while (!kthread_should_stop()) { | |
6742 | enum sq_ret ret = 0; | |
e95eee2d | 6743 | bool cap_entries; |
c1edbf5f JA |
6744 | |
6745 | /* | |
69fb2131 JA |
6746 | * Any changes to the sqd lists are synchronized through the |
6747 | * kthread parking. This synchronizes the thread vs users, | |
6748 | * the users are synchronized on the sqd->ctx_lock. | |
c1edbf5f | 6749 | */ |
69fb2131 JA |
6750 | if (kthread_should_park()) |
6751 | kthread_parkme(); | |
7143b5ac | 6752 | |
69fb2131 JA |
6753 | if (unlikely(!list_empty(&sqd->ctx_new_list))) |
6754 | io_sqd_init_new(sqd); | |
6c271ce2 | 6755 | |
e95eee2d | 6756 | cap_entries = !list_is_singular(&sqd->ctx_list); |
6c271ce2 | 6757 | |
69fb2131 JA |
6758 | list_for_each_entry(ctx, &sqd->ctx_list, sqd_list) { |
6759 | if (current->cred != ctx->creds) { | |
6760 | if (old_cred) | |
6761 | revert_creds(old_cred); | |
6762 | old_cred = override_creds(ctx->creds); | |
bdcd3eab | 6763 | } |
91d8f519 | 6764 | io_sq_thread_associate_blkcg(ctx, &cur_css); |
4ea33a97 JA |
6765 | #ifdef CONFIG_AUDIT |
6766 | current->loginuid = ctx->loginuid; | |
6767 | current->sessionid = ctx->sessionid; | |
6768 | #endif | |
bdcd3eab | 6769 | |
e95eee2d | 6770 | ret |= __io_sq_thread(ctx, start_jiffies, cap_entries); |
6c271ce2 | 6771 | |
69fb2131 JA |
6772 | io_sq_thread_drop_mm(); |
6773 | } | |
6c271ce2 | 6774 | |
69fb2131 | 6775 | if (ret & SQT_SPIN) { |
c8d1ba58 JA |
6776 | io_run_task_work(); |
6777 | cond_resched(); | |
69fb2131 JA |
6778 | } else if (ret == SQT_IDLE) { |
6779 | if (kthread_should_park()) | |
6c271ce2 | 6780 | continue; |
69fb2131 JA |
6781 | list_for_each_entry(ctx, &sqd->ctx_list, sqd_list) |
6782 | io_ring_set_wakeup_flag(ctx); | |
6783 | schedule(); | |
6784 | start_jiffies = jiffies; | |
6785 | list_for_each_entry(ctx, &sqd->ctx_list, sqd_list) | |
6786 | io_ring_clear_wakeup_flag(ctx); | |
6c271ce2 | 6787 | } |
6c271ce2 JA |
6788 | } |
6789 | ||
4c6e277c | 6790 | io_run_task_work(); |
b41e9852 | 6791 | |
91d8f519 DZ |
6792 | if (cur_css) |
6793 | io_sq_thread_unassociate_blkcg(); | |
69fb2131 JA |
6794 | if (old_cred) |
6795 | revert_creds(old_cred); | |
06058632 | 6796 | |
2bbcd6d3 | 6797 | kthread_parkme(); |
06058632 | 6798 | |
6c271ce2 JA |
6799 | return 0; |
6800 | } | |
6801 | ||
bda52162 JA |
6802 | struct io_wait_queue { |
6803 | struct wait_queue_entry wq; | |
6804 | struct io_ring_ctx *ctx; | |
6805 | unsigned to_wait; | |
6806 | unsigned nr_timeouts; | |
6807 | }; | |
6808 | ||
1d7bb1d5 | 6809 | static inline bool io_should_wake(struct io_wait_queue *iowq, bool noflush) |
bda52162 JA |
6810 | { |
6811 | struct io_ring_ctx *ctx = iowq->ctx; | |
6812 | ||
6813 | /* | |
d195a66e | 6814 | * Wake up if we have enough events, or if a timeout occurred since we |
bda52162 JA |
6815 | * started waiting. For timeouts, we always want to return to userspace, |
6816 | * regardless of event count. | |
6817 | */ | |
1d7bb1d5 | 6818 | return io_cqring_events(ctx, noflush) >= iowq->to_wait || |
bda52162 JA |
6819 | atomic_read(&ctx->cq_timeouts) != iowq->nr_timeouts; |
6820 | } | |
6821 | ||
6822 | static int io_wake_function(struct wait_queue_entry *curr, unsigned int mode, | |
6823 | int wake_flags, void *key) | |
6824 | { | |
6825 | struct io_wait_queue *iowq = container_of(curr, struct io_wait_queue, | |
6826 | wq); | |
6827 | ||
1d7bb1d5 JA |
6828 | /* use noflush == true, as we can't safely rely on locking context */ |
6829 | if (!io_should_wake(iowq, true)) | |
bda52162 JA |
6830 | return -1; |
6831 | ||
6832 | return autoremove_wake_function(curr, mode, wake_flags, key); | |
6833 | } | |
6834 | ||
af9c1a44 JA |
6835 | static int io_run_task_work_sig(void) |
6836 | { | |
6837 | if (io_run_task_work()) | |
6838 | return 1; | |
6839 | if (!signal_pending(current)) | |
6840 | return 0; | |
6841 | if (current->jobctl & JOBCTL_TASK_WORK) { | |
6842 | spin_lock_irq(¤t->sighand->siglock); | |
6843 | current->jobctl &= ~JOBCTL_TASK_WORK; | |
6844 | recalc_sigpending(); | |
6845 | spin_unlock_irq(¤t->sighand->siglock); | |
6846 | return 1; | |
6847 | } | |
6848 | return -EINTR; | |
6849 | } | |
6850 | ||
2b188cc1 JA |
6851 | /* |
6852 | * Wait until events become available, if we don't already have some. The | |
6853 | * application must reap them itself, as they reside on the shared cq ring. | |
6854 | */ | |
6855 | static int io_cqring_wait(struct io_ring_ctx *ctx, int min_events, | |
6856 | const sigset_t __user *sig, size_t sigsz) | |
6857 | { | |
bda52162 JA |
6858 | struct io_wait_queue iowq = { |
6859 | .wq = { | |
6860 | .private = current, | |
6861 | .func = io_wake_function, | |
6862 | .entry = LIST_HEAD_INIT(iowq.wq.entry), | |
6863 | }, | |
6864 | .ctx = ctx, | |
6865 | .to_wait = min_events, | |
6866 | }; | |
75b28aff | 6867 | struct io_rings *rings = ctx->rings; |
e9ffa5c2 | 6868 | int ret = 0; |
2b188cc1 | 6869 | |
b41e9852 JA |
6870 | do { |
6871 | if (io_cqring_events(ctx, false) >= min_events) | |
6872 | return 0; | |
4c6e277c | 6873 | if (!io_run_task_work()) |
b41e9852 | 6874 | break; |
b41e9852 | 6875 | } while (1); |
2b188cc1 JA |
6876 | |
6877 | if (sig) { | |
9e75ad5d AB |
6878 | #ifdef CONFIG_COMPAT |
6879 | if (in_compat_syscall()) | |
6880 | ret = set_compat_user_sigmask((const compat_sigset_t __user *)sig, | |
b772434b | 6881 | sigsz); |
9e75ad5d AB |
6882 | else |
6883 | #endif | |
b772434b | 6884 | ret = set_user_sigmask(sig, sigsz); |
9e75ad5d | 6885 | |
2b188cc1 JA |
6886 | if (ret) |
6887 | return ret; | |
6888 | } | |
6889 | ||
bda52162 | 6890 | iowq.nr_timeouts = atomic_read(&ctx->cq_timeouts); |
c826bd7a | 6891 | trace_io_uring_cqring_wait(ctx, min_events); |
bda52162 JA |
6892 | do { |
6893 | prepare_to_wait_exclusive(&ctx->wait, &iowq.wq, | |
6894 | TASK_INTERRUPTIBLE); | |
ce593a6c | 6895 | /* make sure we run task_work before checking for signals */ |
af9c1a44 JA |
6896 | ret = io_run_task_work_sig(); |
6897 | if (ret > 0) | |
4c6e277c | 6898 | continue; |
af9c1a44 | 6899 | else if (ret < 0) |
bda52162 | 6900 | break; |
ce593a6c JA |
6901 | if (io_should_wake(&iowq, false)) |
6902 | break; | |
6903 | schedule(); | |
bda52162 JA |
6904 | } while (1); |
6905 | finish_wait(&ctx->wait, &iowq.wq); | |
6906 | ||
b7db41c9 | 6907 | restore_saved_sigmask_unless(ret == -EINTR); |
2b188cc1 | 6908 | |
75b28aff | 6909 | return READ_ONCE(rings->cq.head) == READ_ONCE(rings->cq.tail) ? ret : 0; |
2b188cc1 JA |
6910 | } |
6911 | ||
6b06314c JA |
6912 | static void __io_sqe_files_unregister(struct io_ring_ctx *ctx) |
6913 | { | |
6914 | #if defined(CONFIG_UNIX) | |
6915 | if (ctx->ring_sock) { | |
6916 | struct sock *sock = ctx->ring_sock->sk; | |
6917 | struct sk_buff *skb; | |
6918 | ||
6919 | while ((skb = skb_dequeue(&sock->sk_receive_queue)) != NULL) | |
6920 | kfree_skb(skb); | |
6921 | } | |
6922 | #else | |
6923 | int i; | |
6924 | ||
65e19f54 JA |
6925 | for (i = 0; i < ctx->nr_user_files; i++) { |
6926 | struct file *file; | |
6927 | ||
6928 | file = io_file_from_index(ctx, i); | |
6929 | if (file) | |
6930 | fput(file); | |
6931 | } | |
6b06314c JA |
6932 | #endif |
6933 | } | |
6934 | ||
05f3fb3c JA |
6935 | static void io_file_ref_kill(struct percpu_ref *ref) |
6936 | { | |
6937 | struct fixed_file_data *data; | |
6938 | ||
6939 | data = container_of(ref, struct fixed_file_data, refs); | |
6940 | complete(&data->done); | |
6941 | } | |
6942 | ||
6b06314c JA |
6943 | static int io_sqe_files_unregister(struct io_ring_ctx *ctx) |
6944 | { | |
05f3fb3c | 6945 | struct fixed_file_data *data = ctx->file_data; |
05589553 | 6946 | struct fixed_file_ref_node *ref_node = NULL; |
65e19f54 JA |
6947 | unsigned nr_tables, i; |
6948 | ||
05f3fb3c | 6949 | if (!data) |
6b06314c JA |
6950 | return -ENXIO; |
6951 | ||
6a4d07cd | 6952 | spin_lock(&data->lock); |
05589553 XW |
6953 | if (!list_empty(&data->ref_list)) |
6954 | ref_node = list_first_entry(&data->ref_list, | |
6955 | struct fixed_file_ref_node, node); | |
6a4d07cd | 6956 | spin_unlock(&data->lock); |
05589553 XW |
6957 | if (ref_node) |
6958 | percpu_ref_kill(&ref_node->refs); | |
6959 | ||
6960 | percpu_ref_kill(&data->refs); | |
6961 | ||
6962 | /* wait for all refs nodes to complete */ | |
4a38aed2 | 6963 | flush_delayed_work(&ctx->file_put_work); |
2faf852d | 6964 | wait_for_completion(&data->done); |
05f3fb3c | 6965 | |
6b06314c | 6966 | __io_sqe_files_unregister(ctx); |
65e19f54 JA |
6967 | nr_tables = DIV_ROUND_UP(ctx->nr_user_files, IORING_MAX_FILES_TABLE); |
6968 | for (i = 0; i < nr_tables; i++) | |
05f3fb3c JA |
6969 | kfree(data->table[i].files); |
6970 | kfree(data->table); | |
05589553 XW |
6971 | percpu_ref_exit(&data->refs); |
6972 | kfree(data); | |
05f3fb3c | 6973 | ctx->file_data = NULL; |
6b06314c JA |
6974 | ctx->nr_user_files = 0; |
6975 | return 0; | |
6976 | } | |
6977 | ||
534ca6d6 | 6978 | static void io_put_sq_data(struct io_sq_data *sqd) |
6c271ce2 | 6979 | { |
534ca6d6 | 6980 | if (refcount_dec_and_test(&sqd->refs)) { |
2bbcd6d3 RP |
6981 | /* |
6982 | * The park is a bit of a work-around, without it we get | |
6983 | * warning spews on shutdown with SQPOLL set and affinity | |
6984 | * set to a single CPU. | |
6985 | */ | |
534ca6d6 JA |
6986 | if (sqd->thread) { |
6987 | kthread_park(sqd->thread); | |
6988 | kthread_stop(sqd->thread); | |
6989 | } | |
6990 | ||
6991 | kfree(sqd); | |
6992 | } | |
6993 | } | |
6994 | ||
aa06165d JA |
6995 | static struct io_sq_data *io_attach_sq_data(struct io_uring_params *p) |
6996 | { | |
6997 | struct io_ring_ctx *ctx_attach; | |
6998 | struct io_sq_data *sqd; | |
6999 | struct fd f; | |
7000 | ||
7001 | f = fdget(p->wq_fd); | |
7002 | if (!f.file) | |
7003 | return ERR_PTR(-ENXIO); | |
7004 | if (f.file->f_op != &io_uring_fops) { | |
7005 | fdput(f); | |
7006 | return ERR_PTR(-EINVAL); | |
7007 | } | |
7008 | ||
7009 | ctx_attach = f.file->private_data; | |
7010 | sqd = ctx_attach->sq_data; | |
7011 | if (!sqd) { | |
7012 | fdput(f); | |
7013 | return ERR_PTR(-EINVAL); | |
7014 | } | |
7015 | ||
7016 | refcount_inc(&sqd->refs); | |
7017 | fdput(f); | |
7018 | return sqd; | |
7019 | } | |
7020 | ||
534ca6d6 JA |
7021 | static struct io_sq_data *io_get_sq_data(struct io_uring_params *p) |
7022 | { | |
7023 | struct io_sq_data *sqd; | |
7024 | ||
aa06165d JA |
7025 | if (p->flags & IORING_SETUP_ATTACH_WQ) |
7026 | return io_attach_sq_data(p); | |
7027 | ||
534ca6d6 JA |
7028 | sqd = kzalloc(sizeof(*sqd), GFP_KERNEL); |
7029 | if (!sqd) | |
7030 | return ERR_PTR(-ENOMEM); | |
7031 | ||
7032 | refcount_set(&sqd->refs, 1); | |
69fb2131 JA |
7033 | INIT_LIST_HEAD(&sqd->ctx_list); |
7034 | INIT_LIST_HEAD(&sqd->ctx_new_list); | |
7035 | mutex_init(&sqd->ctx_lock); | |
7036 | mutex_init(&sqd->lock); | |
534ca6d6 JA |
7037 | init_waitqueue_head(&sqd->wait); |
7038 | return sqd; | |
7039 | } | |
7040 | ||
69fb2131 JA |
7041 | static void io_sq_thread_unpark(struct io_sq_data *sqd) |
7042 | __releases(&sqd->lock) | |
7043 | { | |
7044 | if (!sqd->thread) | |
7045 | return; | |
7046 | kthread_unpark(sqd->thread); | |
7047 | mutex_unlock(&sqd->lock); | |
7048 | } | |
7049 | ||
7050 | static void io_sq_thread_park(struct io_sq_data *sqd) | |
7051 | __acquires(&sqd->lock) | |
7052 | { | |
7053 | if (!sqd->thread) | |
7054 | return; | |
7055 | mutex_lock(&sqd->lock); | |
7056 | kthread_park(sqd->thread); | |
7057 | } | |
7058 | ||
534ca6d6 JA |
7059 | static void io_sq_thread_stop(struct io_ring_ctx *ctx) |
7060 | { | |
7061 | struct io_sq_data *sqd = ctx->sq_data; | |
7062 | ||
7063 | if (sqd) { | |
7064 | if (sqd->thread) { | |
7065 | /* | |
7066 | * We may arrive here from the error branch in | |
7067 | * io_sq_offload_create() where the kthread is created | |
7068 | * without being waked up, thus wake it up now to make | |
7069 | * sure the wait will complete. | |
7070 | */ | |
7071 | wake_up_process(sqd->thread); | |
7072 | wait_for_completion(&ctx->sq_thread_comp); | |
69fb2131 JA |
7073 | |
7074 | io_sq_thread_park(sqd); | |
7075 | } | |
7076 | ||
7077 | mutex_lock(&sqd->ctx_lock); | |
7078 | list_del(&ctx->sqd_list); | |
7079 | mutex_unlock(&sqd->ctx_lock); | |
7080 | ||
7081 | if (sqd->thread) { | |
7082 | finish_wait(&sqd->wait, &ctx->sqo_wait_entry); | |
7083 | io_sq_thread_unpark(sqd); | |
534ca6d6 JA |
7084 | } |
7085 | ||
7086 | io_put_sq_data(sqd); | |
7087 | ctx->sq_data = NULL; | |
6c271ce2 JA |
7088 | } |
7089 | } | |
7090 | ||
6b06314c JA |
7091 | static void io_finish_async(struct io_ring_ctx *ctx) |
7092 | { | |
6c271ce2 JA |
7093 | io_sq_thread_stop(ctx); |
7094 | ||
561fb04a JA |
7095 | if (ctx->io_wq) { |
7096 | io_wq_destroy(ctx->io_wq); | |
7097 | ctx->io_wq = NULL; | |
6b06314c JA |
7098 | } |
7099 | } | |
7100 | ||
7101 | #if defined(CONFIG_UNIX) | |
6b06314c JA |
7102 | /* |
7103 | * Ensure the UNIX gc is aware of our file set, so we are certain that | |
7104 | * the io_uring can be safely unregistered on process exit, even if we have | |
7105 | * loops in the file referencing. | |
7106 | */ | |
7107 | static int __io_sqe_files_scm(struct io_ring_ctx *ctx, int nr, int offset) | |
7108 | { | |
7109 | struct sock *sk = ctx->ring_sock->sk; | |
7110 | struct scm_fp_list *fpl; | |
7111 | struct sk_buff *skb; | |
08a45173 | 7112 | int i, nr_files; |
6b06314c | 7113 | |
6b06314c JA |
7114 | fpl = kzalloc(sizeof(*fpl), GFP_KERNEL); |
7115 | if (!fpl) | |
7116 | return -ENOMEM; | |
7117 | ||
7118 | skb = alloc_skb(0, GFP_KERNEL); | |
7119 | if (!skb) { | |
7120 | kfree(fpl); | |
7121 | return -ENOMEM; | |
7122 | } | |
7123 | ||
7124 | skb->sk = sk; | |
6b06314c | 7125 | |
08a45173 | 7126 | nr_files = 0; |
6b06314c JA |
7127 | fpl->user = get_uid(ctx->user); |
7128 | for (i = 0; i < nr; i++) { | |
65e19f54 JA |
7129 | struct file *file = io_file_from_index(ctx, i + offset); |
7130 | ||
7131 | if (!file) | |
08a45173 | 7132 | continue; |
65e19f54 | 7133 | fpl->fp[nr_files] = get_file(file); |
08a45173 JA |
7134 | unix_inflight(fpl->user, fpl->fp[nr_files]); |
7135 | nr_files++; | |
6b06314c JA |
7136 | } |
7137 | ||
08a45173 JA |
7138 | if (nr_files) { |
7139 | fpl->max = SCM_MAX_FD; | |
7140 | fpl->count = nr_files; | |
7141 | UNIXCB(skb).fp = fpl; | |
05f3fb3c | 7142 | skb->destructor = unix_destruct_scm; |
08a45173 JA |
7143 | refcount_add(skb->truesize, &sk->sk_wmem_alloc); |
7144 | skb_queue_head(&sk->sk_receive_queue, skb); | |
6b06314c | 7145 | |
08a45173 JA |
7146 | for (i = 0; i < nr_files; i++) |
7147 | fput(fpl->fp[i]); | |
7148 | } else { | |
7149 | kfree_skb(skb); | |
7150 | kfree(fpl); | |
7151 | } | |
6b06314c JA |
7152 | |
7153 | return 0; | |
7154 | } | |
7155 | ||
7156 | /* | |
7157 | * If UNIX sockets are enabled, fd passing can cause a reference cycle which | |
7158 | * causes regular reference counting to break down. We rely on the UNIX | |
7159 | * garbage collection to take care of this problem for us. | |
7160 | */ | |
7161 | static int io_sqe_files_scm(struct io_ring_ctx *ctx) | |
7162 | { | |
7163 | unsigned left, total; | |
7164 | int ret = 0; | |
7165 | ||
7166 | total = 0; | |
7167 | left = ctx->nr_user_files; | |
7168 | while (left) { | |
7169 | unsigned this_files = min_t(unsigned, left, SCM_MAX_FD); | |
6b06314c JA |
7170 | |
7171 | ret = __io_sqe_files_scm(ctx, this_files, total); | |
7172 | if (ret) | |
7173 | break; | |
7174 | left -= this_files; | |
7175 | total += this_files; | |
7176 | } | |
7177 | ||
7178 | if (!ret) | |
7179 | return 0; | |
7180 | ||
7181 | while (total < ctx->nr_user_files) { | |
65e19f54 JA |
7182 | struct file *file = io_file_from_index(ctx, total); |
7183 | ||
7184 | if (file) | |
7185 | fput(file); | |
6b06314c JA |
7186 | total++; |
7187 | } | |
7188 | ||
7189 | return ret; | |
7190 | } | |
7191 | #else | |
7192 | static int io_sqe_files_scm(struct io_ring_ctx *ctx) | |
7193 | { | |
7194 | return 0; | |
7195 | } | |
7196 | #endif | |
7197 | ||
5398ae69 PB |
7198 | static int io_sqe_alloc_file_tables(struct fixed_file_data *file_data, |
7199 | unsigned nr_tables, unsigned nr_files) | |
65e19f54 JA |
7200 | { |
7201 | int i; | |
7202 | ||
7203 | for (i = 0; i < nr_tables; i++) { | |
5398ae69 | 7204 | struct fixed_file_table *table = &file_data->table[i]; |
65e19f54 JA |
7205 | unsigned this_files; |
7206 | ||
7207 | this_files = min(nr_files, IORING_MAX_FILES_TABLE); | |
7208 | table->files = kcalloc(this_files, sizeof(struct file *), | |
7209 | GFP_KERNEL); | |
7210 | if (!table->files) | |
7211 | break; | |
7212 | nr_files -= this_files; | |
7213 | } | |
7214 | ||
7215 | if (i == nr_tables) | |
7216 | return 0; | |
7217 | ||
7218 | for (i = 0; i < nr_tables; i++) { | |
5398ae69 | 7219 | struct fixed_file_table *table = &file_data->table[i]; |
65e19f54 JA |
7220 | kfree(table->files); |
7221 | } | |
7222 | return 1; | |
7223 | } | |
7224 | ||
05f3fb3c JA |
7225 | static void io_ring_file_put(struct io_ring_ctx *ctx, struct file *file) |
7226 | { | |
7227 | #if defined(CONFIG_UNIX) | |
7228 | struct sock *sock = ctx->ring_sock->sk; | |
7229 | struct sk_buff_head list, *head = &sock->sk_receive_queue; | |
7230 | struct sk_buff *skb; | |
7231 | int i; | |
7232 | ||
7233 | __skb_queue_head_init(&list); | |
7234 | ||
7235 | /* | |
7236 | * Find the skb that holds this file in its SCM_RIGHTS. When found, | |
7237 | * remove this entry and rearrange the file array. | |
7238 | */ | |
7239 | skb = skb_dequeue(head); | |
7240 | while (skb) { | |
7241 | struct scm_fp_list *fp; | |
7242 | ||
7243 | fp = UNIXCB(skb).fp; | |
7244 | for (i = 0; i < fp->count; i++) { | |
7245 | int left; | |
7246 | ||
7247 | if (fp->fp[i] != file) | |
7248 | continue; | |
7249 | ||
7250 | unix_notinflight(fp->user, fp->fp[i]); | |
7251 | left = fp->count - 1 - i; | |
7252 | if (left) { | |
7253 | memmove(&fp->fp[i], &fp->fp[i + 1], | |
7254 | left * sizeof(struct file *)); | |
7255 | } | |
7256 | fp->count--; | |
7257 | if (!fp->count) { | |
7258 | kfree_skb(skb); | |
7259 | skb = NULL; | |
7260 | } else { | |
7261 | __skb_queue_tail(&list, skb); | |
7262 | } | |
7263 | fput(file); | |
7264 | file = NULL; | |
7265 | break; | |
7266 | } | |
7267 | ||
7268 | if (!file) | |
7269 | break; | |
7270 | ||
7271 | __skb_queue_tail(&list, skb); | |
7272 | ||
7273 | skb = skb_dequeue(head); | |
7274 | } | |
7275 | ||
7276 | if (skb_peek(&list)) { | |
7277 | spin_lock_irq(&head->lock); | |
7278 | while ((skb = __skb_dequeue(&list)) != NULL) | |
7279 | __skb_queue_tail(head, skb); | |
7280 | spin_unlock_irq(&head->lock); | |
7281 | } | |
7282 | #else | |
7283 | fput(file); | |
7284 | #endif | |
7285 | } | |
7286 | ||
7287 | struct io_file_put { | |
05589553 | 7288 | struct list_head list; |
05f3fb3c | 7289 | struct file *file; |
05f3fb3c JA |
7290 | }; |
7291 | ||
4a38aed2 | 7292 | static void __io_file_put_work(struct fixed_file_ref_node *ref_node) |
65e19f54 | 7293 | { |
4a38aed2 JA |
7294 | struct fixed_file_data *file_data = ref_node->file_data; |
7295 | struct io_ring_ctx *ctx = file_data->ctx; | |
05f3fb3c | 7296 | struct io_file_put *pfile, *tmp; |
05589553 XW |
7297 | |
7298 | list_for_each_entry_safe(pfile, tmp, &ref_node->file_list, list) { | |
6a4d07cd | 7299 | list_del(&pfile->list); |
05589553 XW |
7300 | io_ring_file_put(ctx, pfile->file); |
7301 | kfree(pfile); | |
65e19f54 | 7302 | } |
05589553 | 7303 | |
6a4d07cd JA |
7304 | spin_lock(&file_data->lock); |
7305 | list_del(&ref_node->node); | |
7306 | spin_unlock(&file_data->lock); | |
05589553 XW |
7307 | |
7308 | percpu_ref_exit(&ref_node->refs); | |
7309 | kfree(ref_node); | |
7310 | percpu_ref_put(&file_data->refs); | |
2faf852d | 7311 | } |
65e19f54 | 7312 | |
4a38aed2 JA |
7313 | static void io_file_put_work(struct work_struct *work) |
7314 | { | |
7315 | struct io_ring_ctx *ctx; | |
7316 | struct llist_node *node; | |
7317 | ||
7318 | ctx = container_of(work, struct io_ring_ctx, file_put_work.work); | |
7319 | node = llist_del_all(&ctx->file_put_llist); | |
7320 | ||
7321 | while (node) { | |
7322 | struct fixed_file_ref_node *ref_node; | |
7323 | struct llist_node *next = node->next; | |
7324 | ||
7325 | ref_node = llist_entry(node, struct fixed_file_ref_node, llist); | |
7326 | __io_file_put_work(ref_node); | |
7327 | node = next; | |
7328 | } | |
7329 | } | |
7330 | ||
05589553 | 7331 | static void io_file_data_ref_zero(struct percpu_ref *ref) |
2faf852d | 7332 | { |
05589553 | 7333 | struct fixed_file_ref_node *ref_node; |
4a38aed2 JA |
7334 | struct io_ring_ctx *ctx; |
7335 | bool first_add; | |
7336 | int delay = HZ; | |
65e19f54 | 7337 | |
05589553 | 7338 | ref_node = container_of(ref, struct fixed_file_ref_node, refs); |
4a38aed2 | 7339 | ctx = ref_node->file_data->ctx; |
05589553 | 7340 | |
4a38aed2 JA |
7341 | if (percpu_ref_is_dying(&ctx->file_data->refs)) |
7342 | delay = 0; | |
05589553 | 7343 | |
4a38aed2 JA |
7344 | first_add = llist_add(&ref_node->llist, &ctx->file_put_llist); |
7345 | if (!delay) | |
7346 | mod_delayed_work(system_wq, &ctx->file_put_work, 0); | |
7347 | else if (first_add) | |
7348 | queue_delayed_work(system_wq, &ctx->file_put_work, delay); | |
05f3fb3c | 7349 | } |
65e19f54 | 7350 | |
05589553 XW |
7351 | static struct fixed_file_ref_node *alloc_fixed_file_ref_node( |
7352 | struct io_ring_ctx *ctx) | |
05f3fb3c | 7353 | { |
05589553 | 7354 | struct fixed_file_ref_node *ref_node; |
05f3fb3c | 7355 | |
05589553 XW |
7356 | ref_node = kzalloc(sizeof(*ref_node), GFP_KERNEL); |
7357 | if (!ref_node) | |
7358 | return ERR_PTR(-ENOMEM); | |
05f3fb3c | 7359 | |
05589553 XW |
7360 | if (percpu_ref_init(&ref_node->refs, io_file_data_ref_zero, |
7361 | 0, GFP_KERNEL)) { | |
7362 | kfree(ref_node); | |
7363 | return ERR_PTR(-ENOMEM); | |
7364 | } | |
7365 | INIT_LIST_HEAD(&ref_node->node); | |
7366 | INIT_LIST_HEAD(&ref_node->file_list); | |
05589553 XW |
7367 | ref_node->file_data = ctx->file_data; |
7368 | return ref_node; | |
05589553 XW |
7369 | } |
7370 | ||
7371 | static void destroy_fixed_file_ref_node(struct fixed_file_ref_node *ref_node) | |
7372 | { | |
7373 | percpu_ref_exit(&ref_node->refs); | |
7374 | kfree(ref_node); | |
65e19f54 JA |
7375 | } |
7376 | ||
6b06314c JA |
7377 | static int io_sqe_files_register(struct io_ring_ctx *ctx, void __user *arg, |
7378 | unsigned nr_args) | |
7379 | { | |
7380 | __s32 __user *fds = (__s32 __user *) arg; | |
600cf3f8 | 7381 | unsigned nr_tables, i; |
05f3fb3c | 7382 | struct file *file; |
600cf3f8 | 7383 | int fd, ret = -ENOMEM; |
05589553 | 7384 | struct fixed_file_ref_node *ref_node; |
5398ae69 | 7385 | struct fixed_file_data *file_data; |
6b06314c | 7386 | |
05f3fb3c | 7387 | if (ctx->file_data) |
6b06314c JA |
7388 | return -EBUSY; |
7389 | if (!nr_args) | |
7390 | return -EINVAL; | |
7391 | if (nr_args > IORING_MAX_FIXED_FILES) | |
7392 | return -EMFILE; | |
7393 | ||
5398ae69 PB |
7394 | file_data = kzalloc(sizeof(*ctx->file_data), GFP_KERNEL); |
7395 | if (!file_data) | |
05f3fb3c | 7396 | return -ENOMEM; |
5398ae69 PB |
7397 | file_data->ctx = ctx; |
7398 | init_completion(&file_data->done); | |
7399 | INIT_LIST_HEAD(&file_data->ref_list); | |
7400 | spin_lock_init(&file_data->lock); | |
05f3fb3c | 7401 | |
65e19f54 | 7402 | nr_tables = DIV_ROUND_UP(nr_args, IORING_MAX_FILES_TABLE); |
035fbafc | 7403 | file_data->table = kcalloc(nr_tables, sizeof(*file_data->table), |
5398ae69 | 7404 | GFP_KERNEL); |
600cf3f8 PB |
7405 | if (!file_data->table) |
7406 | goto out_free; | |
05f3fb3c | 7407 | |
5398ae69 | 7408 | if (percpu_ref_init(&file_data->refs, io_file_ref_kill, |
600cf3f8 PB |
7409 | PERCPU_REF_ALLOW_REINIT, GFP_KERNEL)) |
7410 | goto out_free; | |
6b06314c | 7411 | |
600cf3f8 PB |
7412 | if (io_sqe_alloc_file_tables(file_data, nr_tables, nr_args)) |
7413 | goto out_ref; | |
55cbc256 | 7414 | ctx->file_data = file_data; |
65e19f54 | 7415 | |
08a45173 | 7416 | for (i = 0; i < nr_args; i++, ctx->nr_user_files++) { |
65e19f54 JA |
7417 | struct fixed_file_table *table; |
7418 | unsigned index; | |
7419 | ||
600cf3f8 PB |
7420 | if (copy_from_user(&fd, &fds[i], sizeof(fd))) { |
7421 | ret = -EFAULT; | |
7422 | goto out_fput; | |
7423 | } | |
08a45173 | 7424 | /* allow sparse sets */ |
600cf3f8 | 7425 | if (fd == -1) |
08a45173 | 7426 | continue; |
6b06314c | 7427 | |
05f3fb3c | 7428 | file = fget(fd); |
6b06314c | 7429 | ret = -EBADF; |
05f3fb3c | 7430 | if (!file) |
600cf3f8 | 7431 | goto out_fput; |
05f3fb3c | 7432 | |
6b06314c JA |
7433 | /* |
7434 | * Don't allow io_uring instances to be registered. If UNIX | |
7435 | * isn't enabled, then this causes a reference cycle and this | |
7436 | * instance can never get freed. If UNIX is enabled we'll | |
7437 | * handle it just fine, but there's still no point in allowing | |
7438 | * a ring fd as it doesn't support regular read/write anyway. | |
7439 | */ | |
05f3fb3c JA |
7440 | if (file->f_op == &io_uring_fops) { |
7441 | fput(file); | |
600cf3f8 | 7442 | goto out_fput; |
6b06314c | 7443 | } |
600cf3f8 PB |
7444 | table = &file_data->table[i >> IORING_FILE_TABLE_SHIFT]; |
7445 | index = i & IORING_FILE_TABLE_MASK; | |
05f3fb3c | 7446 | table->files[index] = file; |
6b06314c JA |
7447 | } |
7448 | ||
6b06314c | 7449 | ret = io_sqe_files_scm(ctx); |
05589553 | 7450 | if (ret) { |
6b06314c | 7451 | io_sqe_files_unregister(ctx); |
05589553 XW |
7452 | return ret; |
7453 | } | |
6b06314c | 7454 | |
05589553 XW |
7455 | ref_node = alloc_fixed_file_ref_node(ctx); |
7456 | if (IS_ERR(ref_node)) { | |
7457 | io_sqe_files_unregister(ctx); | |
7458 | return PTR_ERR(ref_node); | |
7459 | } | |
7460 | ||
b2e96852 | 7461 | file_data->node = ref_node; |
5398ae69 PB |
7462 | spin_lock(&file_data->lock); |
7463 | list_add(&ref_node->node, &file_data->ref_list); | |
7464 | spin_unlock(&file_data->lock); | |
7465 | percpu_ref_get(&file_data->refs); | |
6b06314c | 7466 | return ret; |
600cf3f8 PB |
7467 | out_fput: |
7468 | for (i = 0; i < ctx->nr_user_files; i++) { | |
7469 | file = io_file_from_index(ctx, i); | |
7470 | if (file) | |
7471 | fput(file); | |
7472 | } | |
7473 | for (i = 0; i < nr_tables; i++) | |
7474 | kfree(file_data->table[i].files); | |
7475 | ctx->nr_user_files = 0; | |
7476 | out_ref: | |
7477 | percpu_ref_exit(&file_data->refs); | |
7478 | out_free: | |
7479 | kfree(file_data->table); | |
7480 | kfree(file_data); | |
55cbc256 | 7481 | ctx->file_data = NULL; |
6b06314c JA |
7482 | return ret; |
7483 | } | |
7484 | ||
c3a31e60 JA |
7485 | static int io_sqe_file_register(struct io_ring_ctx *ctx, struct file *file, |
7486 | int index) | |
7487 | { | |
7488 | #if defined(CONFIG_UNIX) | |
7489 | struct sock *sock = ctx->ring_sock->sk; | |
7490 | struct sk_buff_head *head = &sock->sk_receive_queue; | |
7491 | struct sk_buff *skb; | |
7492 | ||
7493 | /* | |
7494 | * See if we can merge this file into an existing skb SCM_RIGHTS | |
7495 | * file set. If there's no room, fall back to allocating a new skb | |
7496 | * and filling it in. | |
7497 | */ | |
7498 | spin_lock_irq(&head->lock); | |
7499 | skb = skb_peek(head); | |
7500 | if (skb) { | |
7501 | struct scm_fp_list *fpl = UNIXCB(skb).fp; | |
7502 | ||
7503 | if (fpl->count < SCM_MAX_FD) { | |
7504 | __skb_unlink(skb, head); | |
7505 | spin_unlock_irq(&head->lock); | |
7506 | fpl->fp[fpl->count] = get_file(file); | |
7507 | unix_inflight(fpl->user, fpl->fp[fpl->count]); | |
7508 | fpl->count++; | |
7509 | spin_lock_irq(&head->lock); | |
7510 | __skb_queue_head(head, skb); | |
7511 | } else { | |
7512 | skb = NULL; | |
7513 | } | |
7514 | } | |
7515 | spin_unlock_irq(&head->lock); | |
7516 | ||
7517 | if (skb) { | |
7518 | fput(file); | |
7519 | return 0; | |
7520 | } | |
7521 | ||
7522 | return __io_sqe_files_scm(ctx, 1, index); | |
7523 | #else | |
7524 | return 0; | |
7525 | #endif | |
7526 | } | |
7527 | ||
a5318d3c | 7528 | static int io_queue_file_removal(struct fixed_file_data *data, |
05589553 | 7529 | struct file *file) |
05f3fb3c | 7530 | { |
a5318d3c | 7531 | struct io_file_put *pfile; |
b2e96852 | 7532 | struct fixed_file_ref_node *ref_node = data->node; |
05f3fb3c | 7533 | |
05f3fb3c | 7534 | pfile = kzalloc(sizeof(*pfile), GFP_KERNEL); |
a5318d3c HD |
7535 | if (!pfile) |
7536 | return -ENOMEM; | |
05f3fb3c JA |
7537 | |
7538 | pfile->file = file; | |
05589553 XW |
7539 | list_add(&pfile->list, &ref_node->file_list); |
7540 | ||
a5318d3c | 7541 | return 0; |
05f3fb3c JA |
7542 | } |
7543 | ||
7544 | static int __io_sqe_files_update(struct io_ring_ctx *ctx, | |
7545 | struct io_uring_files_update *up, | |
7546 | unsigned nr_args) | |
7547 | { | |
7548 | struct fixed_file_data *data = ctx->file_data; | |
05589553 | 7549 | struct fixed_file_ref_node *ref_node; |
05f3fb3c | 7550 | struct file *file; |
c3a31e60 JA |
7551 | __s32 __user *fds; |
7552 | int fd, i, err; | |
7553 | __u32 done; | |
05589553 | 7554 | bool needs_switch = false; |
c3a31e60 | 7555 | |
05f3fb3c | 7556 | if (check_add_overflow(up->offset, nr_args, &done)) |
c3a31e60 JA |
7557 | return -EOVERFLOW; |
7558 | if (done > ctx->nr_user_files) | |
7559 | return -EINVAL; | |
7560 | ||
05589553 XW |
7561 | ref_node = alloc_fixed_file_ref_node(ctx); |
7562 | if (IS_ERR(ref_node)) | |
7563 | return PTR_ERR(ref_node); | |
7564 | ||
c3a31e60 | 7565 | done = 0; |
05f3fb3c | 7566 | fds = u64_to_user_ptr(up->fds); |
c3a31e60 | 7567 | while (nr_args) { |
65e19f54 JA |
7568 | struct fixed_file_table *table; |
7569 | unsigned index; | |
7570 | ||
c3a31e60 JA |
7571 | err = 0; |
7572 | if (copy_from_user(&fd, &fds[done], sizeof(fd))) { | |
7573 | err = -EFAULT; | |
7574 | break; | |
7575 | } | |
05f3fb3c JA |
7576 | i = array_index_nospec(up->offset, ctx->nr_user_files); |
7577 | table = &ctx->file_data->table[i >> IORING_FILE_TABLE_SHIFT]; | |
65e19f54 JA |
7578 | index = i & IORING_FILE_TABLE_MASK; |
7579 | if (table->files[index]) { | |
98dfd502 | 7580 | file = table->files[index]; |
a5318d3c HD |
7581 | err = io_queue_file_removal(data, file); |
7582 | if (err) | |
7583 | break; | |
65e19f54 | 7584 | table->files[index] = NULL; |
05589553 | 7585 | needs_switch = true; |
c3a31e60 JA |
7586 | } |
7587 | if (fd != -1) { | |
c3a31e60 JA |
7588 | file = fget(fd); |
7589 | if (!file) { | |
7590 | err = -EBADF; | |
7591 | break; | |
7592 | } | |
7593 | /* | |
7594 | * Don't allow io_uring instances to be registered. If | |
7595 | * UNIX isn't enabled, then this causes a reference | |
7596 | * cycle and this instance can never get freed. If UNIX | |
7597 | * is enabled we'll handle it just fine, but there's | |
7598 | * still no point in allowing a ring fd as it doesn't | |
7599 | * support regular read/write anyway. | |
7600 | */ | |
7601 | if (file->f_op == &io_uring_fops) { | |
7602 | fput(file); | |
7603 | err = -EBADF; | |
7604 | break; | |
7605 | } | |
65e19f54 | 7606 | table->files[index] = file; |
c3a31e60 | 7607 | err = io_sqe_file_register(ctx, file, i); |
f3bd9dae | 7608 | if (err) { |
95d1c8e5 | 7609 | table->files[index] = NULL; |
f3bd9dae | 7610 | fput(file); |
c3a31e60 | 7611 | break; |
f3bd9dae | 7612 | } |
c3a31e60 JA |
7613 | } |
7614 | nr_args--; | |
7615 | done++; | |
05f3fb3c JA |
7616 | up->offset++; |
7617 | } | |
7618 | ||
05589553 | 7619 | if (needs_switch) { |
b2e96852 | 7620 | percpu_ref_kill(&data->node->refs); |
6a4d07cd | 7621 | spin_lock(&data->lock); |
05589553 | 7622 | list_add(&ref_node->node, &data->ref_list); |
b2e96852 | 7623 | data->node = ref_node; |
6a4d07cd | 7624 | spin_unlock(&data->lock); |
05589553 XW |
7625 | percpu_ref_get(&ctx->file_data->refs); |
7626 | } else | |
7627 | destroy_fixed_file_ref_node(ref_node); | |
c3a31e60 JA |
7628 | |
7629 | return done ? done : err; | |
7630 | } | |
05589553 | 7631 | |
05f3fb3c JA |
7632 | static int io_sqe_files_update(struct io_ring_ctx *ctx, void __user *arg, |
7633 | unsigned nr_args) | |
7634 | { | |
7635 | struct io_uring_files_update up; | |
7636 | ||
7637 | if (!ctx->file_data) | |
7638 | return -ENXIO; | |
7639 | if (!nr_args) | |
7640 | return -EINVAL; | |
7641 | if (copy_from_user(&up, arg, sizeof(up))) | |
7642 | return -EFAULT; | |
7643 | if (up.resv) | |
7644 | return -EINVAL; | |
7645 | ||
7646 | return __io_sqe_files_update(ctx, &up, nr_args); | |
7647 | } | |
c3a31e60 | 7648 | |
e9fd9396 | 7649 | static void io_free_work(struct io_wq_work *work) |
7d723065 JA |
7650 | { |
7651 | struct io_kiocb *req = container_of(work, struct io_kiocb, work); | |
7652 | ||
e9fd9396 | 7653 | /* Consider that io_steal_work() relies on this ref */ |
7d723065 JA |
7654 | io_put_req(req); |
7655 | } | |
7656 | ||
24369c2e PB |
7657 | static int io_init_wq_offload(struct io_ring_ctx *ctx, |
7658 | struct io_uring_params *p) | |
7659 | { | |
7660 | struct io_wq_data data; | |
7661 | struct fd f; | |
7662 | struct io_ring_ctx *ctx_attach; | |
7663 | unsigned int concurrency; | |
7664 | int ret = 0; | |
7665 | ||
7666 | data.user = ctx->user; | |
e9fd9396 | 7667 | data.free_work = io_free_work; |
f5fa38c5 | 7668 | data.do_work = io_wq_submit_work; |
24369c2e PB |
7669 | |
7670 | if (!(p->flags & IORING_SETUP_ATTACH_WQ)) { | |
7671 | /* Do QD, or 4 * CPUS, whatever is smallest */ | |
7672 | concurrency = min(ctx->sq_entries, 4 * num_online_cpus()); | |
7673 | ||
7674 | ctx->io_wq = io_wq_create(concurrency, &data); | |
7675 | if (IS_ERR(ctx->io_wq)) { | |
7676 | ret = PTR_ERR(ctx->io_wq); | |
7677 | ctx->io_wq = NULL; | |
7678 | } | |
7679 | return ret; | |
7680 | } | |
7681 | ||
7682 | f = fdget(p->wq_fd); | |
7683 | if (!f.file) | |
7684 | return -EBADF; | |
7685 | ||
7686 | if (f.file->f_op != &io_uring_fops) { | |
7687 | ret = -EINVAL; | |
7688 | goto out_fput; | |
7689 | } | |
7690 | ||
7691 | ctx_attach = f.file->private_data; | |
7692 | /* @io_wq is protected by holding the fd */ | |
7693 | if (!io_wq_get(ctx_attach->io_wq, &data)) { | |
7694 | ret = -EINVAL; | |
7695 | goto out_fput; | |
7696 | } | |
7697 | ||
7698 | ctx->io_wq = ctx_attach->io_wq; | |
7699 | out_fput: | |
7700 | fdput(f); | |
7701 | return ret; | |
7702 | } | |
7703 | ||
0f212204 JA |
7704 | static int io_uring_alloc_task_context(struct task_struct *task) |
7705 | { | |
7706 | struct io_uring_task *tctx; | |
d8a6df10 | 7707 | int ret; |
0f212204 JA |
7708 | |
7709 | tctx = kmalloc(sizeof(*tctx), GFP_KERNEL); | |
7710 | if (unlikely(!tctx)) | |
7711 | return -ENOMEM; | |
7712 | ||
d8a6df10 JA |
7713 | ret = percpu_counter_init(&tctx->inflight, 0, GFP_KERNEL); |
7714 | if (unlikely(ret)) { | |
7715 | kfree(tctx); | |
7716 | return ret; | |
7717 | } | |
7718 | ||
0f212204 JA |
7719 | xa_init(&tctx->xa); |
7720 | init_waitqueue_head(&tctx->wait); | |
7721 | tctx->last = NULL; | |
7722 | tctx->in_idle = 0; | |
500a373d JA |
7723 | io_init_identity(&tctx->__identity); |
7724 | tctx->identity = &tctx->__identity; | |
0f212204 JA |
7725 | task->io_uring = tctx; |
7726 | return 0; | |
7727 | } | |
7728 | ||
7729 | void __io_uring_free(struct task_struct *tsk) | |
7730 | { | |
7731 | struct io_uring_task *tctx = tsk->io_uring; | |
7732 | ||
7733 | WARN_ON_ONCE(!xa_empty(&tctx->xa)); | |
500a373d JA |
7734 | WARN_ON_ONCE(refcount_read(&tctx->identity->count) != 1); |
7735 | if (tctx->identity != &tctx->__identity) | |
7736 | kfree(tctx->identity); | |
d8a6df10 | 7737 | percpu_counter_destroy(&tctx->inflight); |
0f212204 JA |
7738 | kfree(tctx); |
7739 | tsk->io_uring = NULL; | |
7740 | } | |
7741 | ||
7e84e1c7 SG |
7742 | static int io_sq_offload_create(struct io_ring_ctx *ctx, |
7743 | struct io_uring_params *p) | |
2b188cc1 JA |
7744 | { |
7745 | int ret; | |
7746 | ||
6c271ce2 | 7747 | if (ctx->flags & IORING_SETUP_SQPOLL) { |
534ca6d6 JA |
7748 | struct io_sq_data *sqd; |
7749 | ||
3ec482d1 JA |
7750 | ret = -EPERM; |
7751 | if (!capable(CAP_SYS_ADMIN)) | |
7752 | goto err; | |
7753 | ||
534ca6d6 JA |
7754 | sqd = io_get_sq_data(p); |
7755 | if (IS_ERR(sqd)) { | |
7756 | ret = PTR_ERR(sqd); | |
7757 | goto err; | |
7758 | } | |
69fb2131 | 7759 | |
534ca6d6 | 7760 | ctx->sq_data = sqd; |
69fb2131 JA |
7761 | io_sq_thread_park(sqd); |
7762 | mutex_lock(&sqd->ctx_lock); | |
7763 | list_add(&ctx->sqd_list, &sqd->ctx_new_list); | |
7764 | mutex_unlock(&sqd->ctx_lock); | |
7765 | io_sq_thread_unpark(sqd); | |
534ca6d6 | 7766 | |
917257da JA |
7767 | ctx->sq_thread_idle = msecs_to_jiffies(p->sq_thread_idle); |
7768 | if (!ctx->sq_thread_idle) | |
7769 | ctx->sq_thread_idle = HZ; | |
7770 | ||
aa06165d JA |
7771 | if (sqd->thread) |
7772 | goto done; | |
7773 | ||
6c271ce2 | 7774 | if (p->flags & IORING_SETUP_SQ_AFF) { |
44a9bd18 | 7775 | int cpu = p->sq_thread_cpu; |
6c271ce2 | 7776 | |
917257da | 7777 | ret = -EINVAL; |
44a9bd18 JA |
7778 | if (cpu >= nr_cpu_ids) |
7779 | goto err; | |
7889f44d | 7780 | if (!cpu_online(cpu)) |
917257da JA |
7781 | goto err; |
7782 | ||
69fb2131 | 7783 | sqd->thread = kthread_create_on_cpu(io_sq_thread, sqd, |
534ca6d6 | 7784 | cpu, "io_uring-sq"); |
6c271ce2 | 7785 | } else { |
69fb2131 | 7786 | sqd->thread = kthread_create(io_sq_thread, sqd, |
6c271ce2 JA |
7787 | "io_uring-sq"); |
7788 | } | |
534ca6d6 JA |
7789 | if (IS_ERR(sqd->thread)) { |
7790 | ret = PTR_ERR(sqd->thread); | |
7791 | sqd->thread = NULL; | |
6c271ce2 JA |
7792 | goto err; |
7793 | } | |
534ca6d6 | 7794 | ret = io_uring_alloc_task_context(sqd->thread); |
0f212204 JA |
7795 | if (ret) |
7796 | goto err; | |
6c271ce2 JA |
7797 | } else if (p->flags & IORING_SETUP_SQ_AFF) { |
7798 | /* Can't have SQ_AFF without SQPOLL */ | |
7799 | ret = -EINVAL; | |
7800 | goto err; | |
7801 | } | |
7802 | ||
aa06165d | 7803 | done: |
24369c2e PB |
7804 | ret = io_init_wq_offload(ctx, p); |
7805 | if (ret) | |
2b188cc1 | 7806 | goto err; |
2b188cc1 JA |
7807 | |
7808 | return 0; | |
7809 | err: | |
54a91f3b | 7810 | io_finish_async(ctx); |
2b188cc1 JA |
7811 | return ret; |
7812 | } | |
7813 | ||
7e84e1c7 SG |
7814 | static void io_sq_offload_start(struct io_ring_ctx *ctx) |
7815 | { | |
534ca6d6 JA |
7816 | struct io_sq_data *sqd = ctx->sq_data; |
7817 | ||
7818 | if ((ctx->flags & IORING_SETUP_SQPOLL) && sqd->thread) | |
7819 | wake_up_process(sqd->thread); | |
7e84e1c7 SG |
7820 | } |
7821 | ||
a087e2b5 BM |
7822 | static inline void __io_unaccount_mem(struct user_struct *user, |
7823 | unsigned long nr_pages) | |
2b188cc1 JA |
7824 | { |
7825 | atomic_long_sub(nr_pages, &user->locked_vm); | |
7826 | } | |
7827 | ||
a087e2b5 BM |
7828 | static inline int __io_account_mem(struct user_struct *user, |
7829 | unsigned long nr_pages) | |
2b188cc1 JA |
7830 | { |
7831 | unsigned long page_limit, cur_pages, new_pages; | |
7832 | ||
7833 | /* Don't allow more pages than we can safely lock */ | |
7834 | page_limit = rlimit(RLIMIT_MEMLOCK) >> PAGE_SHIFT; | |
7835 | ||
7836 | do { | |
7837 | cur_pages = atomic_long_read(&user->locked_vm); | |
7838 | new_pages = cur_pages + nr_pages; | |
7839 | if (new_pages > page_limit) | |
7840 | return -ENOMEM; | |
7841 | } while (atomic_long_cmpxchg(&user->locked_vm, cur_pages, | |
7842 | new_pages) != cur_pages); | |
7843 | ||
7844 | return 0; | |
7845 | } | |
7846 | ||
2e0464d4 BM |
7847 | static void io_unaccount_mem(struct io_ring_ctx *ctx, unsigned long nr_pages, |
7848 | enum io_mem_account acct) | |
a087e2b5 | 7849 | { |
aad5d8da | 7850 | if (ctx->limit_mem) |
a087e2b5 | 7851 | __io_unaccount_mem(ctx->user, nr_pages); |
30975825 | 7852 | |
2aede0e4 | 7853 | if (ctx->mm_account) { |
2e0464d4 | 7854 | if (acct == ACCT_LOCKED) |
2aede0e4 | 7855 | ctx->mm_account->locked_vm -= nr_pages; |
2e0464d4 | 7856 | else if (acct == ACCT_PINNED) |
2aede0e4 | 7857 | atomic64_sub(nr_pages, &ctx->mm_account->pinned_vm); |
2e0464d4 | 7858 | } |
a087e2b5 BM |
7859 | } |
7860 | ||
2e0464d4 BM |
7861 | static int io_account_mem(struct io_ring_ctx *ctx, unsigned long nr_pages, |
7862 | enum io_mem_account acct) | |
a087e2b5 | 7863 | { |
30975825 BM |
7864 | int ret; |
7865 | ||
7866 | if (ctx->limit_mem) { | |
7867 | ret = __io_account_mem(ctx->user, nr_pages); | |
7868 | if (ret) | |
7869 | return ret; | |
7870 | } | |
7871 | ||
2aede0e4 | 7872 | if (ctx->mm_account) { |
2e0464d4 | 7873 | if (acct == ACCT_LOCKED) |
2aede0e4 | 7874 | ctx->mm_account->locked_vm += nr_pages; |
2e0464d4 | 7875 | else if (acct == ACCT_PINNED) |
2aede0e4 | 7876 | atomic64_add(nr_pages, &ctx->mm_account->pinned_vm); |
2e0464d4 | 7877 | } |
a087e2b5 BM |
7878 | |
7879 | return 0; | |
7880 | } | |
7881 | ||
2b188cc1 JA |
7882 | static void io_mem_free(void *ptr) |
7883 | { | |
52e04ef4 MR |
7884 | struct page *page; |
7885 | ||
7886 | if (!ptr) | |
7887 | return; | |
2b188cc1 | 7888 | |
52e04ef4 | 7889 | page = virt_to_head_page(ptr); |
2b188cc1 JA |
7890 | if (put_page_testzero(page)) |
7891 | free_compound_page(page); | |
7892 | } | |
7893 | ||
7894 | static void *io_mem_alloc(size_t size) | |
7895 | { | |
7896 | gfp_t gfp_flags = GFP_KERNEL | __GFP_ZERO | __GFP_NOWARN | __GFP_COMP | | |
7897 | __GFP_NORETRY; | |
7898 | ||
7899 | return (void *) __get_free_pages(gfp_flags, get_order(size)); | |
7900 | } | |
7901 | ||
75b28aff HV |
7902 | static unsigned long rings_size(unsigned sq_entries, unsigned cq_entries, |
7903 | size_t *sq_offset) | |
7904 | { | |
7905 | struct io_rings *rings; | |
7906 | size_t off, sq_array_size; | |
7907 | ||
7908 | off = struct_size(rings, cqes, cq_entries); | |
7909 | if (off == SIZE_MAX) | |
7910 | return SIZE_MAX; | |
7911 | ||
7912 | #ifdef CONFIG_SMP | |
7913 | off = ALIGN(off, SMP_CACHE_BYTES); | |
7914 | if (off == 0) | |
7915 | return SIZE_MAX; | |
7916 | #endif | |
7917 | ||
b36200f5 DV |
7918 | if (sq_offset) |
7919 | *sq_offset = off; | |
7920 | ||
75b28aff HV |
7921 | sq_array_size = array_size(sizeof(u32), sq_entries); |
7922 | if (sq_array_size == SIZE_MAX) | |
7923 | return SIZE_MAX; | |
7924 | ||
7925 | if (check_add_overflow(off, sq_array_size, &off)) | |
7926 | return SIZE_MAX; | |
7927 | ||
75b28aff HV |
7928 | return off; |
7929 | } | |
7930 | ||
2b188cc1 JA |
7931 | static unsigned long ring_pages(unsigned sq_entries, unsigned cq_entries) |
7932 | { | |
75b28aff | 7933 | size_t pages; |
2b188cc1 | 7934 | |
75b28aff HV |
7935 | pages = (size_t)1 << get_order( |
7936 | rings_size(sq_entries, cq_entries, NULL)); | |
7937 | pages += (size_t)1 << get_order( | |
7938 | array_size(sizeof(struct io_uring_sqe), sq_entries)); | |
2b188cc1 | 7939 | |
75b28aff | 7940 | return pages; |
2b188cc1 JA |
7941 | } |
7942 | ||
edafccee JA |
7943 | static int io_sqe_buffer_unregister(struct io_ring_ctx *ctx) |
7944 | { | |
7945 | int i, j; | |
7946 | ||
7947 | if (!ctx->user_bufs) | |
7948 | return -ENXIO; | |
7949 | ||
7950 | for (i = 0; i < ctx->nr_user_bufs; i++) { | |
7951 | struct io_mapped_ubuf *imu = &ctx->user_bufs[i]; | |
7952 | ||
7953 | for (j = 0; j < imu->nr_bvecs; j++) | |
f1f6a7dd | 7954 | unpin_user_page(imu->bvec[j].bv_page); |
edafccee | 7955 | |
de293938 JA |
7956 | if (imu->acct_pages) |
7957 | io_unaccount_mem(ctx, imu->acct_pages, ACCT_PINNED); | |
d4ef6475 | 7958 | kvfree(imu->bvec); |
edafccee JA |
7959 | imu->nr_bvecs = 0; |
7960 | } | |
7961 | ||
7962 | kfree(ctx->user_bufs); | |
7963 | ctx->user_bufs = NULL; | |
7964 | ctx->nr_user_bufs = 0; | |
7965 | return 0; | |
7966 | } | |
7967 | ||
7968 | static int io_copy_iov(struct io_ring_ctx *ctx, struct iovec *dst, | |
7969 | void __user *arg, unsigned index) | |
7970 | { | |
7971 | struct iovec __user *src; | |
7972 | ||
7973 | #ifdef CONFIG_COMPAT | |
7974 | if (ctx->compat) { | |
7975 | struct compat_iovec __user *ciovs; | |
7976 | struct compat_iovec ciov; | |
7977 | ||
7978 | ciovs = (struct compat_iovec __user *) arg; | |
7979 | if (copy_from_user(&ciov, &ciovs[index], sizeof(ciov))) | |
7980 | return -EFAULT; | |
7981 | ||
d55e5f5b | 7982 | dst->iov_base = u64_to_user_ptr((u64)ciov.iov_base); |
edafccee JA |
7983 | dst->iov_len = ciov.iov_len; |
7984 | return 0; | |
7985 | } | |
7986 | #endif | |
7987 | src = (struct iovec __user *) arg; | |
7988 | if (copy_from_user(dst, &src[index], sizeof(*dst))) | |
7989 | return -EFAULT; | |
7990 | return 0; | |
7991 | } | |
7992 | ||
de293938 JA |
7993 | /* |
7994 | * Not super efficient, but this is just a registration time. And we do cache | |
7995 | * the last compound head, so generally we'll only do a full search if we don't | |
7996 | * match that one. | |
7997 | * | |
7998 | * We check if the given compound head page has already been accounted, to | |
7999 | * avoid double accounting it. This allows us to account the full size of the | |
8000 | * page, not just the constituent pages of a huge page. | |
8001 | */ | |
8002 | static bool headpage_already_acct(struct io_ring_ctx *ctx, struct page **pages, | |
8003 | int nr_pages, struct page *hpage) | |
8004 | { | |
8005 | int i, j; | |
8006 | ||
8007 | /* check current page array */ | |
8008 | for (i = 0; i < nr_pages; i++) { | |
8009 | if (!PageCompound(pages[i])) | |
8010 | continue; | |
8011 | if (compound_head(pages[i]) == hpage) | |
8012 | return true; | |
8013 | } | |
8014 | ||
8015 | /* check previously registered pages */ | |
8016 | for (i = 0; i < ctx->nr_user_bufs; i++) { | |
8017 | struct io_mapped_ubuf *imu = &ctx->user_bufs[i]; | |
8018 | ||
8019 | for (j = 0; j < imu->nr_bvecs; j++) { | |
8020 | if (!PageCompound(imu->bvec[j].bv_page)) | |
8021 | continue; | |
8022 | if (compound_head(imu->bvec[j].bv_page) == hpage) | |
8023 | return true; | |
8024 | } | |
8025 | } | |
8026 | ||
8027 | return false; | |
8028 | } | |
8029 | ||
8030 | static int io_buffer_account_pin(struct io_ring_ctx *ctx, struct page **pages, | |
8031 | int nr_pages, struct io_mapped_ubuf *imu, | |
8032 | struct page **last_hpage) | |
8033 | { | |
8034 | int i, ret; | |
8035 | ||
8036 | for (i = 0; i < nr_pages; i++) { | |
8037 | if (!PageCompound(pages[i])) { | |
8038 | imu->acct_pages++; | |
8039 | } else { | |
8040 | struct page *hpage; | |
8041 | ||
8042 | hpage = compound_head(pages[i]); | |
8043 | if (hpage == *last_hpage) | |
8044 | continue; | |
8045 | *last_hpage = hpage; | |
8046 | if (headpage_already_acct(ctx, pages, i, hpage)) | |
8047 | continue; | |
8048 | imu->acct_pages += page_size(hpage) >> PAGE_SHIFT; | |
8049 | } | |
8050 | } | |
8051 | ||
8052 | if (!imu->acct_pages) | |
8053 | return 0; | |
8054 | ||
8055 | ret = io_account_mem(ctx, imu->acct_pages, ACCT_PINNED); | |
8056 | if (ret) | |
8057 | imu->acct_pages = 0; | |
8058 | return ret; | |
8059 | } | |
8060 | ||
edafccee JA |
8061 | static int io_sqe_buffer_register(struct io_ring_ctx *ctx, void __user *arg, |
8062 | unsigned nr_args) | |
8063 | { | |
8064 | struct vm_area_struct **vmas = NULL; | |
8065 | struct page **pages = NULL; | |
de293938 | 8066 | struct page *last_hpage = NULL; |
edafccee JA |
8067 | int i, j, got_pages = 0; |
8068 | int ret = -EINVAL; | |
8069 | ||
8070 | if (ctx->user_bufs) | |
8071 | return -EBUSY; | |
8072 | if (!nr_args || nr_args > UIO_MAXIOV) | |
8073 | return -EINVAL; | |
8074 | ||
8075 | ctx->user_bufs = kcalloc(nr_args, sizeof(struct io_mapped_ubuf), | |
8076 | GFP_KERNEL); | |
8077 | if (!ctx->user_bufs) | |
8078 | return -ENOMEM; | |
8079 | ||
8080 | for (i = 0; i < nr_args; i++) { | |
8081 | struct io_mapped_ubuf *imu = &ctx->user_bufs[i]; | |
8082 | unsigned long off, start, end, ubuf; | |
8083 | int pret, nr_pages; | |
8084 | struct iovec iov; | |
8085 | size_t size; | |
8086 | ||
8087 | ret = io_copy_iov(ctx, &iov, arg, i); | |
8088 | if (ret) | |
a278682d | 8089 | goto err; |
edafccee JA |
8090 | |
8091 | /* | |
8092 | * Don't impose further limits on the size and buffer | |
8093 | * constraints here, we'll -EINVAL later when IO is | |
8094 | * submitted if they are wrong. | |
8095 | */ | |
8096 | ret = -EFAULT; | |
8097 | if (!iov.iov_base || !iov.iov_len) | |
8098 | goto err; | |
8099 | ||
8100 | /* arbitrary limit, but we need something */ | |
8101 | if (iov.iov_len > SZ_1G) | |
8102 | goto err; | |
8103 | ||
8104 | ubuf = (unsigned long) iov.iov_base; | |
8105 | end = (ubuf + iov.iov_len + PAGE_SIZE - 1) >> PAGE_SHIFT; | |
8106 | start = ubuf >> PAGE_SHIFT; | |
8107 | nr_pages = end - start; | |
8108 | ||
edafccee JA |
8109 | ret = 0; |
8110 | if (!pages || nr_pages > got_pages) { | |
a8c73c1a DE |
8111 | kvfree(vmas); |
8112 | kvfree(pages); | |
d4ef6475 | 8113 | pages = kvmalloc_array(nr_pages, sizeof(struct page *), |
edafccee | 8114 | GFP_KERNEL); |
d4ef6475 | 8115 | vmas = kvmalloc_array(nr_pages, |
edafccee JA |
8116 | sizeof(struct vm_area_struct *), |
8117 | GFP_KERNEL); | |
8118 | if (!pages || !vmas) { | |
8119 | ret = -ENOMEM; | |
edafccee JA |
8120 | goto err; |
8121 | } | |
8122 | got_pages = nr_pages; | |
8123 | } | |
8124 | ||
d4ef6475 | 8125 | imu->bvec = kvmalloc_array(nr_pages, sizeof(struct bio_vec), |
edafccee JA |
8126 | GFP_KERNEL); |
8127 | ret = -ENOMEM; | |
de293938 | 8128 | if (!imu->bvec) |
edafccee | 8129 | goto err; |
edafccee JA |
8130 | |
8131 | ret = 0; | |
d8ed45c5 | 8132 | mmap_read_lock(current->mm); |
2113b05d | 8133 | pret = pin_user_pages(ubuf, nr_pages, |
932f4a63 IW |
8134 | FOLL_WRITE | FOLL_LONGTERM, |
8135 | pages, vmas); | |
edafccee JA |
8136 | if (pret == nr_pages) { |
8137 | /* don't support file backed memory */ | |
8138 | for (j = 0; j < nr_pages; j++) { | |
8139 | struct vm_area_struct *vma = vmas[j]; | |
8140 | ||
8141 | if (vma->vm_file && | |
8142 | !is_file_hugepages(vma->vm_file)) { | |
8143 | ret = -EOPNOTSUPP; | |
8144 | break; | |
8145 | } | |
8146 | } | |
8147 | } else { | |
8148 | ret = pret < 0 ? pret : -EFAULT; | |
8149 | } | |
d8ed45c5 | 8150 | mmap_read_unlock(current->mm); |
edafccee JA |
8151 | if (ret) { |
8152 | /* | |
8153 | * if we did partial map, or found file backed vmas, | |
8154 | * release any pages we did get | |
8155 | */ | |
27c4d3a3 | 8156 | if (pret > 0) |
f1f6a7dd | 8157 | unpin_user_pages(pages, pret); |
de293938 JA |
8158 | kvfree(imu->bvec); |
8159 | goto err; | |
8160 | } | |
8161 | ||
8162 | ret = io_buffer_account_pin(ctx, pages, pret, imu, &last_hpage); | |
8163 | if (ret) { | |
8164 | unpin_user_pages(pages, pret); | |
d4ef6475 | 8165 | kvfree(imu->bvec); |
edafccee JA |
8166 | goto err; |
8167 | } | |
8168 | ||
8169 | off = ubuf & ~PAGE_MASK; | |
8170 | size = iov.iov_len; | |
8171 | for (j = 0; j < nr_pages; j++) { | |
8172 | size_t vec_len; | |
8173 | ||
8174 | vec_len = min_t(size_t, size, PAGE_SIZE - off); | |
8175 | imu->bvec[j].bv_page = pages[j]; | |
8176 | imu->bvec[j].bv_len = vec_len; | |
8177 | imu->bvec[j].bv_offset = off; | |
8178 | off = 0; | |
8179 | size -= vec_len; | |
8180 | } | |
8181 | /* store original address for later verification */ | |
8182 | imu->ubuf = ubuf; | |
8183 | imu->len = iov.iov_len; | |
8184 | imu->nr_bvecs = nr_pages; | |
8185 | ||
8186 | ctx->nr_user_bufs++; | |
8187 | } | |
d4ef6475 MR |
8188 | kvfree(pages); |
8189 | kvfree(vmas); | |
edafccee JA |
8190 | return 0; |
8191 | err: | |
d4ef6475 MR |
8192 | kvfree(pages); |
8193 | kvfree(vmas); | |
edafccee JA |
8194 | io_sqe_buffer_unregister(ctx); |
8195 | return ret; | |
8196 | } | |
8197 | ||
9b402849 JA |
8198 | static int io_eventfd_register(struct io_ring_ctx *ctx, void __user *arg) |
8199 | { | |
8200 | __s32 __user *fds = arg; | |
8201 | int fd; | |
8202 | ||
8203 | if (ctx->cq_ev_fd) | |
8204 | return -EBUSY; | |
8205 | ||
8206 | if (copy_from_user(&fd, fds, sizeof(*fds))) | |
8207 | return -EFAULT; | |
8208 | ||
8209 | ctx->cq_ev_fd = eventfd_ctx_fdget(fd); | |
8210 | if (IS_ERR(ctx->cq_ev_fd)) { | |
8211 | int ret = PTR_ERR(ctx->cq_ev_fd); | |
8212 | ctx->cq_ev_fd = NULL; | |
8213 | return ret; | |
8214 | } | |
8215 | ||
8216 | return 0; | |
8217 | } | |
8218 | ||
8219 | static int io_eventfd_unregister(struct io_ring_ctx *ctx) | |
8220 | { | |
8221 | if (ctx->cq_ev_fd) { | |
8222 | eventfd_ctx_put(ctx->cq_ev_fd); | |
8223 | ctx->cq_ev_fd = NULL; | |
8224 | return 0; | |
8225 | } | |
8226 | ||
8227 | return -ENXIO; | |
8228 | } | |
8229 | ||
5a2e745d JA |
8230 | static int __io_destroy_buffers(int id, void *p, void *data) |
8231 | { | |
8232 | struct io_ring_ctx *ctx = data; | |
8233 | struct io_buffer *buf = p; | |
8234 | ||
067524e9 | 8235 | __io_remove_buffers(ctx, buf, id, -1U); |
5a2e745d JA |
8236 | return 0; |
8237 | } | |
8238 | ||
8239 | static void io_destroy_buffers(struct io_ring_ctx *ctx) | |
8240 | { | |
8241 | idr_for_each(&ctx->io_buffer_idr, __io_destroy_buffers, ctx); | |
8242 | idr_destroy(&ctx->io_buffer_idr); | |
8243 | } | |
8244 | ||
2b188cc1 JA |
8245 | static void io_ring_ctx_free(struct io_ring_ctx *ctx) |
8246 | { | |
6b06314c | 8247 | io_finish_async(ctx); |
5dbcad51 | 8248 | io_sqe_buffer_unregister(ctx); |
2aede0e4 JA |
8249 | |
8250 | if (ctx->sqo_task) { | |
8251 | put_task_struct(ctx->sqo_task); | |
8252 | ctx->sqo_task = NULL; | |
8253 | mmdrop(ctx->mm_account); | |
8254 | ctx->mm_account = NULL; | |
30975825 | 8255 | } |
def596e9 | 8256 | |
91d8f519 DZ |
8257 | #ifdef CONFIG_BLK_CGROUP |
8258 | if (ctx->sqo_blkcg_css) | |
8259 | css_put(ctx->sqo_blkcg_css); | |
8260 | #endif | |
8261 | ||
6b06314c | 8262 | io_sqe_files_unregister(ctx); |
9b402849 | 8263 | io_eventfd_unregister(ctx); |
5a2e745d | 8264 | io_destroy_buffers(ctx); |
41726c9a | 8265 | idr_destroy(&ctx->personality_idr); |
def596e9 | 8266 | |
2b188cc1 | 8267 | #if defined(CONFIG_UNIX) |
355e8d26 EB |
8268 | if (ctx->ring_sock) { |
8269 | ctx->ring_sock->file = NULL; /* so that iput() is called */ | |
2b188cc1 | 8270 | sock_release(ctx->ring_sock); |
355e8d26 | 8271 | } |
2b188cc1 JA |
8272 | #endif |
8273 | ||
75b28aff | 8274 | io_mem_free(ctx->rings); |
2b188cc1 | 8275 | io_mem_free(ctx->sq_sqes); |
2b188cc1 JA |
8276 | |
8277 | percpu_ref_exit(&ctx->refs); | |
2b188cc1 | 8278 | free_uid(ctx->user); |
181e448d | 8279 | put_cred(ctx->creds); |
78076bb6 | 8280 | kfree(ctx->cancel_hash); |
0ddf92e8 | 8281 | kmem_cache_free(req_cachep, ctx->fallback_req); |
2b188cc1 JA |
8282 | kfree(ctx); |
8283 | } | |
8284 | ||
8285 | static __poll_t io_uring_poll(struct file *file, poll_table *wait) | |
8286 | { | |
8287 | struct io_ring_ctx *ctx = file->private_data; | |
8288 | __poll_t mask = 0; | |
8289 | ||
8290 | poll_wait(file, &ctx->cq_wait, wait); | |
4f7067c3 SB |
8291 | /* |
8292 | * synchronizes with barrier from wq_has_sleeper call in | |
8293 | * io_commit_cqring | |
8294 | */ | |
2b188cc1 | 8295 | smp_rmb(); |
90554200 | 8296 | if (!io_sqring_full(ctx)) |
2b188cc1 | 8297 | mask |= EPOLLOUT | EPOLLWRNORM; |
63e5d81f | 8298 | if (io_cqring_events(ctx, false)) |
2b188cc1 JA |
8299 | mask |= EPOLLIN | EPOLLRDNORM; |
8300 | ||
8301 | return mask; | |
8302 | } | |
8303 | ||
8304 | static int io_uring_fasync(int fd, struct file *file, int on) | |
8305 | { | |
8306 | struct io_ring_ctx *ctx = file->private_data; | |
8307 | ||
8308 | return fasync_helper(fd, file, on, &ctx->cq_fasync); | |
8309 | } | |
8310 | ||
071698e1 JA |
8311 | static int io_remove_personalities(int id, void *p, void *data) |
8312 | { | |
8313 | struct io_ring_ctx *ctx = data; | |
1e6fa521 | 8314 | struct io_identity *iod; |
071698e1 | 8315 | |
1e6fa521 JA |
8316 | iod = idr_remove(&ctx->personality_idr, id); |
8317 | if (iod) { | |
8318 | put_cred(iod->creds); | |
8319 | if (refcount_dec_and_test(&iod->count)) | |
8320 | kfree(iod); | |
8321 | } | |
071698e1 JA |
8322 | return 0; |
8323 | } | |
8324 | ||
85faa7b8 JA |
8325 | static void io_ring_exit_work(struct work_struct *work) |
8326 | { | |
b2edc0a7 PB |
8327 | struct io_ring_ctx *ctx = container_of(work, struct io_ring_ctx, |
8328 | exit_work); | |
85faa7b8 | 8329 | |
56952e91 JA |
8330 | /* |
8331 | * If we're doing polled IO and end up having requests being | |
8332 | * submitted async (out-of-line), then completions can come in while | |
8333 | * we're waiting for refs to drop. We need to reap these manually, | |
8334 | * as nobody else will be looking for them. | |
8335 | */ | |
b2edc0a7 | 8336 | do { |
56952e91 | 8337 | if (ctx->rings) |
e6c8aa9a | 8338 | io_cqring_overflow_flush(ctx, true, NULL, NULL); |
b2edc0a7 PB |
8339 | io_iopoll_try_reap_events(ctx); |
8340 | } while (!wait_for_completion_timeout(&ctx->ref_comp, HZ/20)); | |
85faa7b8 JA |
8341 | io_ring_ctx_free(ctx); |
8342 | } | |
8343 | ||
2b188cc1 JA |
8344 | static void io_ring_ctx_wait_and_kill(struct io_ring_ctx *ctx) |
8345 | { | |
8346 | mutex_lock(&ctx->uring_lock); | |
8347 | percpu_ref_kill(&ctx->refs); | |
8348 | mutex_unlock(&ctx->uring_lock); | |
8349 | ||
f3606e3a JA |
8350 | io_kill_timeouts(ctx, NULL); |
8351 | io_poll_remove_all(ctx, NULL); | |
561fb04a JA |
8352 | |
8353 | if (ctx->io_wq) | |
8354 | io_wq_cancel_all(ctx->io_wq); | |
8355 | ||
15dff286 JA |
8356 | /* if we failed setting up the ctx, we might not have any rings */ |
8357 | if (ctx->rings) | |
e6c8aa9a | 8358 | io_cqring_overflow_flush(ctx, true, NULL, NULL); |
b2edc0a7 | 8359 | io_iopoll_try_reap_events(ctx); |
071698e1 | 8360 | idr_for_each(&ctx->personality_idr, io_remove_personalities, ctx); |
309fc03a JA |
8361 | |
8362 | /* | |
8363 | * Do this upfront, so we won't have a grace period where the ring | |
8364 | * is closed but resources aren't reaped yet. This can cause | |
8365 | * spurious failure in setting up a new ring. | |
8366 | */ | |
760618f7 JA |
8367 | io_unaccount_mem(ctx, ring_pages(ctx->sq_entries, ctx->cq_entries), |
8368 | ACCT_LOCKED); | |
309fc03a | 8369 | |
85faa7b8 | 8370 | INIT_WORK(&ctx->exit_work, io_ring_exit_work); |
fc666777 JA |
8371 | /* |
8372 | * Use system_unbound_wq to avoid spawning tons of event kworkers | |
8373 | * if we're exiting a ton of rings at the same time. It just adds | |
8374 | * noise and overhead, there's no discernable change in runtime | |
8375 | * over using system_wq. | |
8376 | */ | |
8377 | queue_work(system_unbound_wq, &ctx->exit_work); | |
2b188cc1 JA |
8378 | } |
8379 | ||
8380 | static int io_uring_release(struct inode *inode, struct file *file) | |
8381 | { | |
8382 | struct io_ring_ctx *ctx = file->private_data; | |
8383 | ||
8384 | file->private_data = NULL; | |
8385 | io_ring_ctx_wait_and_kill(ctx); | |
8386 | return 0; | |
8387 | } | |
8388 | ||
67c4d9e6 PB |
8389 | static bool io_wq_files_match(struct io_wq_work *work, void *data) |
8390 | { | |
8391 | struct files_struct *files = data; | |
8392 | ||
dfead8a8 | 8393 | return !files || ((work->flags & IO_WQ_WORK_FILES) && |
98447d65 | 8394 | work->identity->files == files); |
67c4d9e6 PB |
8395 | } |
8396 | ||
f254ac04 JA |
8397 | /* |
8398 | * Returns true if 'preq' is the link parent of 'req' | |
8399 | */ | |
8400 | static bool io_match_link(struct io_kiocb *preq, struct io_kiocb *req) | |
8401 | { | |
8402 | struct io_kiocb *link; | |
8403 | ||
8404 | if (!(preq->flags & REQ_F_LINK_HEAD)) | |
8405 | return false; | |
8406 | ||
8407 | list_for_each_entry(link, &preq->link_list, link_list) { | |
8408 | if (link == req) | |
8409 | return true; | |
8410 | } | |
8411 | ||
8412 | return false; | |
8413 | } | |
8414 | ||
c127a2a1 PB |
8415 | static bool io_match_link_files(struct io_kiocb *req, |
8416 | struct files_struct *files) | |
8417 | { | |
8418 | struct io_kiocb *link; | |
8419 | ||
8420 | if (io_match_files(req, files)) | |
8421 | return true; | |
8422 | if (req->flags & REQ_F_LINK_HEAD) { | |
8423 | list_for_each_entry(link, &req->link_list, link_list) { | |
8424 | if (io_match_files(link, files)) | |
8425 | return true; | |
8426 | } | |
8427 | } | |
8428 | return false; | |
8429 | } | |
8430 | ||
f254ac04 JA |
8431 | /* |
8432 | * We're looking to cancel 'req' because it's holding on to our files, but | |
8433 | * 'req' could be a link to another request. See if it is, and cancel that | |
8434 | * parent request if so. | |
8435 | */ | |
8436 | static bool io_poll_remove_link(struct io_ring_ctx *ctx, struct io_kiocb *req) | |
8437 | { | |
8438 | struct hlist_node *tmp; | |
8439 | struct io_kiocb *preq; | |
8440 | bool found = false; | |
8441 | int i; | |
8442 | ||
8443 | spin_lock_irq(&ctx->completion_lock); | |
8444 | for (i = 0; i < (1U << ctx->cancel_hash_bits); i++) { | |
8445 | struct hlist_head *list; | |
8446 | ||
8447 | list = &ctx->cancel_hash[i]; | |
8448 | hlist_for_each_entry_safe(preq, tmp, list, hash_node) { | |
8449 | found = io_match_link(preq, req); | |
8450 | if (found) { | |
8451 | io_poll_remove_one(preq); | |
8452 | break; | |
8453 | } | |
8454 | } | |
8455 | } | |
8456 | spin_unlock_irq(&ctx->completion_lock); | |
8457 | return found; | |
8458 | } | |
8459 | ||
8460 | static bool io_timeout_remove_link(struct io_ring_ctx *ctx, | |
8461 | struct io_kiocb *req) | |
8462 | { | |
8463 | struct io_kiocb *preq; | |
8464 | bool found = false; | |
8465 | ||
8466 | spin_lock_irq(&ctx->completion_lock); | |
8467 | list_for_each_entry(preq, &ctx->timeout_list, timeout.list) { | |
8468 | found = io_match_link(preq, req); | |
8469 | if (found) { | |
8470 | __io_timeout_cancel(preq); | |
8471 | break; | |
8472 | } | |
8473 | } | |
8474 | spin_unlock_irq(&ctx->completion_lock); | |
8475 | return found; | |
8476 | } | |
8477 | ||
b711d4ea JA |
8478 | static bool io_cancel_link_cb(struct io_wq_work *work, void *data) |
8479 | { | |
8480 | return io_match_link(container_of(work, struct io_kiocb, work), data); | |
8481 | } | |
8482 | ||
8483 | static void io_attempt_cancel(struct io_ring_ctx *ctx, struct io_kiocb *req) | |
8484 | { | |
8485 | enum io_wq_cancel cret; | |
8486 | ||
8487 | /* cancel this particular work, if it's running */ | |
8488 | cret = io_wq_cancel_work(ctx->io_wq, &req->work); | |
8489 | if (cret != IO_WQ_CANCEL_NOTFOUND) | |
8490 | return; | |
8491 | ||
8492 | /* find links that hold this pending, cancel those */ | |
8493 | cret = io_wq_cancel_cb(ctx->io_wq, io_cancel_link_cb, req, true); | |
8494 | if (cret != IO_WQ_CANCEL_NOTFOUND) | |
8495 | return; | |
8496 | ||
8497 | /* if we have a poll link holding this pending, cancel that */ | |
8498 | if (io_poll_remove_link(ctx, req)) | |
8499 | return; | |
8500 | ||
8501 | /* final option, timeout link is holding this req pending */ | |
8502 | io_timeout_remove_link(ctx, req); | |
8503 | } | |
8504 | ||
b7ddce3c PB |
8505 | static void io_cancel_defer_files(struct io_ring_ctx *ctx, |
8506 | struct files_struct *files) | |
8507 | { | |
8508 | struct io_defer_entry *de = NULL; | |
8509 | LIST_HEAD(list); | |
8510 | ||
8511 | spin_lock_irq(&ctx->completion_lock); | |
8512 | list_for_each_entry_reverse(de, &ctx->defer_list, list) { | |
c127a2a1 | 8513 | if (io_match_link_files(de->req, files)) { |
b7ddce3c PB |
8514 | list_cut_position(&list, &ctx->defer_list, &de->list); |
8515 | break; | |
8516 | } | |
8517 | } | |
8518 | spin_unlock_irq(&ctx->completion_lock); | |
8519 | ||
8520 | while (!list_empty(&list)) { | |
8521 | de = list_first_entry(&list, struct io_defer_entry, list); | |
8522 | list_del_init(&de->list); | |
8523 | req_set_fail_links(de->req); | |
8524 | io_put_req(de->req); | |
8525 | io_req_complete(de->req, -ECANCELED); | |
8526 | kfree(de); | |
8527 | } | |
8528 | } | |
8529 | ||
76e1b642 JA |
8530 | /* |
8531 | * Returns true if we found and killed one or more files pinning requests | |
8532 | */ | |
8533 | static bool io_uring_cancel_files(struct io_ring_ctx *ctx, | |
fcb323cc JA |
8534 | struct files_struct *files) |
8535 | { | |
67c4d9e6 | 8536 | if (list_empty_careful(&ctx->inflight_list)) |
76e1b642 | 8537 | return false; |
67c4d9e6 | 8538 | |
b7ddce3c | 8539 | io_cancel_defer_files(ctx, files); |
67c4d9e6 PB |
8540 | /* cancel all at once, should be faster than doing it one by one*/ |
8541 | io_wq_cancel_cb(ctx->io_wq, io_wq_files_match, files, true); | |
8542 | ||
fcb323cc | 8543 | while (!list_empty_careful(&ctx->inflight_list)) { |
d8f1b971 XW |
8544 | struct io_kiocb *cancel_req = NULL, *req; |
8545 | DEFINE_WAIT(wait); | |
fcb323cc JA |
8546 | |
8547 | spin_lock_irq(&ctx->inflight_lock); | |
8548 | list_for_each_entry(req, &ctx->inflight_list, inflight_entry) { | |
dfead8a8 | 8549 | if (files && (req->work.flags & IO_WQ_WORK_FILES) && |
98447d65 | 8550 | req->work.identity->files != files) |
768134d4 JA |
8551 | continue; |
8552 | /* req is being completed, ignore */ | |
8553 | if (!refcount_inc_not_zero(&req->refs)) | |
8554 | continue; | |
8555 | cancel_req = req; | |
8556 | break; | |
fcb323cc | 8557 | } |
768134d4 | 8558 | if (cancel_req) |
fcb323cc | 8559 | prepare_to_wait(&ctx->inflight_wait, &wait, |
768134d4 | 8560 | TASK_UNINTERRUPTIBLE); |
fcb323cc JA |
8561 | spin_unlock_irq(&ctx->inflight_lock); |
8562 | ||
768134d4 JA |
8563 | /* We need to keep going until we don't find a matching req */ |
8564 | if (!cancel_req) | |
fcb323cc | 8565 | break; |
bb175342 PB |
8566 | /* cancel this request, or head link requests */ |
8567 | io_attempt_cancel(ctx, cancel_req); | |
8568 | io_put_req(cancel_req); | |
6200b0ae JA |
8569 | /* cancellations _may_ trigger task work */ |
8570 | io_run_task_work(); | |
fcb323cc | 8571 | schedule(); |
d8f1b971 | 8572 | finish_wait(&ctx->inflight_wait, &wait); |
fcb323cc | 8573 | } |
76e1b642 JA |
8574 | |
8575 | return true; | |
fcb323cc JA |
8576 | } |
8577 | ||
801dd57b | 8578 | static bool io_cancel_task_cb(struct io_wq_work *work, void *data) |
44e728b8 | 8579 | { |
801dd57b PB |
8580 | struct io_kiocb *req = container_of(work, struct io_kiocb, work); |
8581 | struct task_struct *task = data; | |
44e728b8 | 8582 | |
f3606e3a | 8583 | return io_task_match(req, task); |
44e728b8 PB |
8584 | } |
8585 | ||
0f212204 JA |
8586 | static bool __io_uring_cancel_task_requests(struct io_ring_ctx *ctx, |
8587 | struct task_struct *task, | |
8588 | struct files_struct *files) | |
8589 | { | |
8590 | bool ret; | |
8591 | ||
8592 | ret = io_uring_cancel_files(ctx, files); | |
8593 | if (!files) { | |
8594 | enum io_wq_cancel cret; | |
8595 | ||
8596 | cret = io_wq_cancel_cb(ctx->io_wq, io_cancel_task_cb, task, true); | |
8597 | if (cret != IO_WQ_CANCEL_NOTFOUND) | |
8598 | ret = true; | |
8599 | ||
8600 | /* SQPOLL thread does its own polling */ | |
8601 | if (!(ctx->flags & IORING_SETUP_SQPOLL)) { | |
8602 | while (!list_empty_careful(&ctx->iopoll_list)) { | |
8603 | io_iopoll_try_reap_events(ctx); | |
8604 | ret = true; | |
8605 | } | |
8606 | } | |
8607 | ||
8608 | ret |= io_poll_remove_all(ctx, task); | |
8609 | ret |= io_kill_timeouts(ctx, task); | |
8610 | } | |
8611 | ||
8612 | return ret; | |
8613 | } | |
8614 | ||
8615 | /* | |
8616 | * We need to iteratively cancel requests, in case a request has dependent | |
8617 | * hard links. These persist even for failure of cancelations, hence keep | |
8618 | * looping until none are found. | |
8619 | */ | |
8620 | static void io_uring_cancel_task_requests(struct io_ring_ctx *ctx, | |
8621 | struct files_struct *files) | |
8622 | { | |
8623 | struct task_struct *task = current; | |
8624 | ||
534ca6d6 JA |
8625 | if ((ctx->flags & IORING_SETUP_SQPOLL) && ctx->sq_data) |
8626 | task = ctx->sq_data->thread; | |
0f212204 JA |
8627 | |
8628 | io_cqring_overflow_flush(ctx, true, task, files); | |
8629 | ||
8630 | while (__io_uring_cancel_task_requests(ctx, task, files)) { | |
8631 | io_run_task_work(); | |
8632 | cond_resched(); | |
8633 | } | |
8634 | } | |
8635 | ||
8636 | /* | |
8637 | * Note that this task has used io_uring. We use it for cancelation purposes. | |
8638 | */ | |
8639 | static int io_uring_add_task_file(struct file *file) | |
8640 | { | |
236434c3 MWO |
8641 | struct io_uring_task *tctx = current->io_uring; |
8642 | ||
8643 | if (unlikely(!tctx)) { | |
0f212204 JA |
8644 | int ret; |
8645 | ||
8646 | ret = io_uring_alloc_task_context(current); | |
8647 | if (unlikely(ret)) | |
8648 | return ret; | |
236434c3 | 8649 | tctx = current->io_uring; |
0f212204 | 8650 | } |
236434c3 MWO |
8651 | if (tctx->last != file) { |
8652 | void *old = xa_load(&tctx->xa, (unsigned long)file); | |
0f212204 | 8653 | |
236434c3 | 8654 | if (!old) { |
0f212204 | 8655 | get_file(file); |
236434c3 | 8656 | xa_store(&tctx->xa, (unsigned long)file, file, GFP_KERNEL); |
0f212204 | 8657 | } |
236434c3 | 8658 | tctx->last = file; |
0f212204 JA |
8659 | } |
8660 | ||
8661 | return 0; | |
8662 | } | |
8663 | ||
8664 | /* | |
8665 | * Remove this io_uring_file -> task mapping. | |
8666 | */ | |
8667 | static void io_uring_del_task_file(struct file *file) | |
8668 | { | |
8669 | struct io_uring_task *tctx = current->io_uring; | |
0f212204 JA |
8670 | |
8671 | if (tctx->last == file) | |
8672 | tctx->last = NULL; | |
5e2ed8c4 | 8673 | file = xa_erase(&tctx->xa, (unsigned long)file); |
0f212204 JA |
8674 | if (file) |
8675 | fput(file); | |
8676 | } | |
8677 | ||
8678 | static void __io_uring_attempt_task_drop(struct file *file) | |
8679 | { | |
5e2ed8c4 | 8680 | struct file *old = xa_load(¤t->io_uring->xa, (unsigned long)file); |
0f212204 JA |
8681 | |
8682 | if (old == file) | |
8683 | io_uring_del_task_file(file); | |
8684 | } | |
8685 | ||
8686 | /* | |
8687 | * Drop task note for this file if we're the only ones that hold it after | |
8688 | * pending fput() | |
8689 | */ | |
8690 | static void io_uring_attempt_task_drop(struct file *file, bool exiting) | |
8691 | { | |
8692 | if (!current->io_uring) | |
8693 | return; | |
8694 | /* | |
8695 | * fput() is pending, will be 2 if the only other ref is our potential | |
8696 | * task file note. If the task is exiting, drop regardless of count. | |
8697 | */ | |
8698 | if (!exiting && atomic_long_read(&file->f_count) != 2) | |
8699 | return; | |
8700 | ||
8701 | __io_uring_attempt_task_drop(file); | |
8702 | } | |
8703 | ||
8704 | void __io_uring_files_cancel(struct files_struct *files) | |
8705 | { | |
8706 | struct io_uring_task *tctx = current->io_uring; | |
ce765372 MWO |
8707 | struct file *file; |
8708 | unsigned long index; | |
0f212204 JA |
8709 | |
8710 | /* make sure overflow events are dropped */ | |
8711 | tctx->in_idle = true; | |
8712 | ||
ce765372 MWO |
8713 | xa_for_each(&tctx->xa, index, file) { |
8714 | struct io_ring_ctx *ctx = file->private_data; | |
0f212204 JA |
8715 | |
8716 | io_uring_cancel_task_requests(ctx, files); | |
8717 | if (files) | |
8718 | io_uring_del_task_file(file); | |
ce765372 | 8719 | } |
0f212204 JA |
8720 | } |
8721 | ||
0f212204 JA |
8722 | /* |
8723 | * Find any io_uring fd that this task has registered or done IO on, and cancel | |
8724 | * requests. | |
8725 | */ | |
8726 | void __io_uring_task_cancel(void) | |
8727 | { | |
8728 | struct io_uring_task *tctx = current->io_uring; | |
8729 | DEFINE_WAIT(wait); | |
d8a6df10 | 8730 | s64 inflight; |
0f212204 JA |
8731 | |
8732 | /* make sure overflow events are dropped */ | |
8733 | tctx->in_idle = true; | |
8734 | ||
d8a6df10 | 8735 | do { |
0f212204 | 8736 | /* read completions before cancelations */ |
d8a6df10 JA |
8737 | inflight = percpu_counter_sum(&tctx->inflight); |
8738 | if (!inflight) | |
8739 | break; | |
0f212204 JA |
8740 | __io_uring_files_cancel(NULL); |
8741 | ||
8742 | prepare_to_wait(&tctx->wait, &wait, TASK_UNINTERRUPTIBLE); | |
8743 | ||
8744 | /* | |
8745 | * If we've seen completions, retry. This avoids a race where | |
8746 | * a completion comes in before we did prepare_to_wait(). | |
8747 | */ | |
d8a6df10 | 8748 | if (inflight != percpu_counter_sum(&tctx->inflight)) |
0f212204 | 8749 | continue; |
0f212204 | 8750 | schedule(); |
d8a6df10 | 8751 | } while (1); |
0f212204 JA |
8752 | |
8753 | finish_wait(&tctx->wait, &wait); | |
8754 | tctx->in_idle = false; | |
44e728b8 PB |
8755 | } |
8756 | ||
fcb323cc JA |
8757 | static int io_uring_flush(struct file *file, void *data) |
8758 | { | |
8759 | struct io_ring_ctx *ctx = file->private_data; | |
8760 | ||
6ab23144 JA |
8761 | /* |
8762 | * If the task is going away, cancel work it may have pending | |
8763 | */ | |
801dd57b | 8764 | if (fatal_signal_pending(current) || (current->flags & PF_EXITING)) |
0f212204 | 8765 | data = NULL; |
6ab23144 | 8766 | |
0f212204 JA |
8767 | io_uring_cancel_task_requests(ctx, data); |
8768 | io_uring_attempt_task_drop(file, !data); | |
fcb323cc JA |
8769 | return 0; |
8770 | } | |
8771 | ||
6c5c240e RP |
8772 | static void *io_uring_validate_mmap_request(struct file *file, |
8773 | loff_t pgoff, size_t sz) | |
2b188cc1 | 8774 | { |
2b188cc1 | 8775 | struct io_ring_ctx *ctx = file->private_data; |
6c5c240e | 8776 | loff_t offset = pgoff << PAGE_SHIFT; |
2b188cc1 JA |
8777 | struct page *page; |
8778 | void *ptr; | |
8779 | ||
8780 | switch (offset) { | |
8781 | case IORING_OFF_SQ_RING: | |
75b28aff HV |
8782 | case IORING_OFF_CQ_RING: |
8783 | ptr = ctx->rings; | |
2b188cc1 JA |
8784 | break; |
8785 | case IORING_OFF_SQES: | |
8786 | ptr = ctx->sq_sqes; | |
8787 | break; | |
2b188cc1 | 8788 | default: |
6c5c240e | 8789 | return ERR_PTR(-EINVAL); |
2b188cc1 JA |
8790 | } |
8791 | ||
8792 | page = virt_to_head_page(ptr); | |
a50b854e | 8793 | if (sz > page_size(page)) |
6c5c240e RP |
8794 | return ERR_PTR(-EINVAL); |
8795 | ||
8796 | return ptr; | |
8797 | } | |
8798 | ||
8799 | #ifdef CONFIG_MMU | |
8800 | ||
8801 | static int io_uring_mmap(struct file *file, struct vm_area_struct *vma) | |
8802 | { | |
8803 | size_t sz = vma->vm_end - vma->vm_start; | |
8804 | unsigned long pfn; | |
8805 | void *ptr; | |
8806 | ||
8807 | ptr = io_uring_validate_mmap_request(file, vma->vm_pgoff, sz); | |
8808 | if (IS_ERR(ptr)) | |
8809 | return PTR_ERR(ptr); | |
2b188cc1 JA |
8810 | |
8811 | pfn = virt_to_phys(ptr) >> PAGE_SHIFT; | |
8812 | return remap_pfn_range(vma, vma->vm_start, pfn, sz, vma->vm_page_prot); | |
8813 | } | |
8814 | ||
6c5c240e RP |
8815 | #else /* !CONFIG_MMU */ |
8816 | ||
8817 | static int io_uring_mmap(struct file *file, struct vm_area_struct *vma) | |
8818 | { | |
8819 | return vma->vm_flags & (VM_SHARED | VM_MAYSHARE) ? 0 : -EINVAL; | |
8820 | } | |
8821 | ||
8822 | static unsigned int io_uring_nommu_mmap_capabilities(struct file *file) | |
8823 | { | |
8824 | return NOMMU_MAP_DIRECT | NOMMU_MAP_READ | NOMMU_MAP_WRITE; | |
8825 | } | |
8826 | ||
8827 | static unsigned long io_uring_nommu_get_unmapped_area(struct file *file, | |
8828 | unsigned long addr, unsigned long len, | |
8829 | unsigned long pgoff, unsigned long flags) | |
8830 | { | |
8831 | void *ptr; | |
8832 | ||
8833 | ptr = io_uring_validate_mmap_request(file, pgoff, len); | |
8834 | if (IS_ERR(ptr)) | |
8835 | return PTR_ERR(ptr); | |
8836 | ||
8837 | return (unsigned long) ptr; | |
8838 | } | |
8839 | ||
8840 | #endif /* !CONFIG_MMU */ | |
8841 | ||
90554200 JA |
8842 | static void io_sqpoll_wait_sq(struct io_ring_ctx *ctx) |
8843 | { | |
8844 | DEFINE_WAIT(wait); | |
8845 | ||
8846 | do { | |
8847 | if (!io_sqring_full(ctx)) | |
8848 | break; | |
8849 | ||
8850 | prepare_to_wait(&ctx->sqo_sq_wait, &wait, TASK_INTERRUPTIBLE); | |
8851 | ||
8852 | if (!io_sqring_full(ctx)) | |
8853 | break; | |
8854 | ||
8855 | schedule(); | |
8856 | } while (!signal_pending(current)); | |
8857 | ||
8858 | finish_wait(&ctx->sqo_sq_wait, &wait); | |
8859 | } | |
8860 | ||
2b188cc1 JA |
8861 | SYSCALL_DEFINE6(io_uring_enter, unsigned int, fd, u32, to_submit, |
8862 | u32, min_complete, u32, flags, const sigset_t __user *, sig, | |
8863 | size_t, sigsz) | |
8864 | { | |
8865 | struct io_ring_ctx *ctx; | |
8866 | long ret = -EBADF; | |
8867 | int submitted = 0; | |
8868 | struct fd f; | |
8869 | ||
4c6e277c | 8870 | io_run_task_work(); |
b41e9852 | 8871 | |
90554200 JA |
8872 | if (flags & ~(IORING_ENTER_GETEVENTS | IORING_ENTER_SQ_WAKEUP | |
8873 | IORING_ENTER_SQ_WAIT)) | |
2b188cc1 JA |
8874 | return -EINVAL; |
8875 | ||
8876 | f = fdget(fd); | |
8877 | if (!f.file) | |
8878 | return -EBADF; | |
8879 | ||
8880 | ret = -EOPNOTSUPP; | |
8881 | if (f.file->f_op != &io_uring_fops) | |
8882 | goto out_fput; | |
8883 | ||
8884 | ret = -ENXIO; | |
8885 | ctx = f.file->private_data; | |
8886 | if (!percpu_ref_tryget(&ctx->refs)) | |
8887 | goto out_fput; | |
8888 | ||
7e84e1c7 SG |
8889 | ret = -EBADFD; |
8890 | if (ctx->flags & IORING_SETUP_R_DISABLED) | |
8891 | goto out; | |
8892 | ||
6c271ce2 JA |
8893 | /* |
8894 | * For SQ polling, the thread will do all submissions and completions. | |
8895 | * Just return the requested submit count, and wake the thread if | |
8896 | * we were asked to. | |
8897 | */ | |
b2a9eada | 8898 | ret = 0; |
6c271ce2 | 8899 | if (ctx->flags & IORING_SETUP_SQPOLL) { |
c1edbf5f | 8900 | if (!list_empty_careful(&ctx->cq_overflow_list)) |
e6c8aa9a | 8901 | io_cqring_overflow_flush(ctx, false, NULL, NULL); |
6c271ce2 | 8902 | if (flags & IORING_ENTER_SQ_WAKEUP) |
534ca6d6 | 8903 | wake_up(&ctx->sq_data->wait); |
90554200 JA |
8904 | if (flags & IORING_ENTER_SQ_WAIT) |
8905 | io_sqpoll_wait_sq(ctx); | |
6c271ce2 | 8906 | submitted = to_submit; |
b2a9eada | 8907 | } else if (to_submit) { |
0f212204 JA |
8908 | ret = io_uring_add_task_file(f.file); |
8909 | if (unlikely(ret)) | |
8910 | goto out; | |
2b188cc1 | 8911 | mutex_lock(&ctx->uring_lock); |
0f212204 | 8912 | submitted = io_submit_sqes(ctx, to_submit); |
2b188cc1 | 8913 | mutex_unlock(&ctx->uring_lock); |
7c504e65 PB |
8914 | |
8915 | if (submitted != to_submit) | |
8916 | goto out; | |
2b188cc1 JA |
8917 | } |
8918 | if (flags & IORING_ENTER_GETEVENTS) { | |
8919 | min_complete = min(min_complete, ctx->cq_entries); | |
8920 | ||
32b2244a XW |
8921 | /* |
8922 | * When SETUP_IOPOLL and SETUP_SQPOLL are both enabled, user | |
8923 | * space applications don't need to do io completion events | |
8924 | * polling again, they can rely on io_sq_thread to do polling | |
8925 | * work, which can reduce cpu usage and uring_lock contention. | |
8926 | */ | |
8927 | if (ctx->flags & IORING_SETUP_IOPOLL && | |
8928 | !(ctx->flags & IORING_SETUP_SQPOLL)) { | |
7668b92a | 8929 | ret = io_iopoll_check(ctx, min_complete); |
def596e9 JA |
8930 | } else { |
8931 | ret = io_cqring_wait(ctx, min_complete, sig, sigsz); | |
8932 | } | |
2b188cc1 JA |
8933 | } |
8934 | ||
7c504e65 | 8935 | out: |
6805b32e | 8936 | percpu_ref_put(&ctx->refs); |
2b188cc1 JA |
8937 | out_fput: |
8938 | fdput(f); | |
8939 | return submitted ? submitted : ret; | |
8940 | } | |
8941 | ||
bebdb65e | 8942 | #ifdef CONFIG_PROC_FS |
87ce955b JA |
8943 | static int io_uring_show_cred(int id, void *p, void *data) |
8944 | { | |
8945 | const struct cred *cred = p; | |
8946 | struct seq_file *m = data; | |
8947 | struct user_namespace *uns = seq_user_ns(m); | |
8948 | struct group_info *gi; | |
8949 | kernel_cap_t cap; | |
8950 | unsigned __capi; | |
8951 | int g; | |
8952 | ||
8953 | seq_printf(m, "%5d\n", id); | |
8954 | seq_put_decimal_ull(m, "\tUid:\t", from_kuid_munged(uns, cred->uid)); | |
8955 | seq_put_decimal_ull(m, "\t\t", from_kuid_munged(uns, cred->euid)); | |
8956 | seq_put_decimal_ull(m, "\t\t", from_kuid_munged(uns, cred->suid)); | |
8957 | seq_put_decimal_ull(m, "\t\t", from_kuid_munged(uns, cred->fsuid)); | |
8958 | seq_put_decimal_ull(m, "\n\tGid:\t", from_kgid_munged(uns, cred->gid)); | |
8959 | seq_put_decimal_ull(m, "\t\t", from_kgid_munged(uns, cred->egid)); | |
8960 | seq_put_decimal_ull(m, "\t\t", from_kgid_munged(uns, cred->sgid)); | |
8961 | seq_put_decimal_ull(m, "\t\t", from_kgid_munged(uns, cred->fsgid)); | |
8962 | seq_puts(m, "\n\tGroups:\t"); | |
8963 | gi = cred->group_info; | |
8964 | for (g = 0; g < gi->ngroups; g++) { | |
8965 | seq_put_decimal_ull(m, g ? " " : "", | |
8966 | from_kgid_munged(uns, gi->gid[g])); | |
8967 | } | |
8968 | seq_puts(m, "\n\tCapEff:\t"); | |
8969 | cap = cred->cap_effective; | |
8970 | CAP_FOR_EACH_U32(__capi) | |
8971 | seq_put_hex_ll(m, NULL, cap.cap[CAP_LAST_U32 - __capi], 8); | |
8972 | seq_putc(m, '\n'); | |
8973 | return 0; | |
8974 | } | |
8975 | ||
8976 | static void __io_uring_show_fdinfo(struct io_ring_ctx *ctx, struct seq_file *m) | |
8977 | { | |
dbbe9c64 | 8978 | struct io_sq_data *sq = NULL; |
fad8e0de | 8979 | bool has_lock; |
87ce955b JA |
8980 | int i; |
8981 | ||
fad8e0de JA |
8982 | /* |
8983 | * Avoid ABBA deadlock between the seq lock and the io_uring mutex, | |
8984 | * since fdinfo case grabs it in the opposite direction of normal use | |
8985 | * cases. If we fail to get the lock, we just don't iterate any | |
8986 | * structures that could be going away outside the io_uring mutex. | |
8987 | */ | |
8988 | has_lock = mutex_trylock(&ctx->uring_lock); | |
8989 | ||
dbbe9c64 JQ |
8990 | if (has_lock && (ctx->flags & IORING_SETUP_SQPOLL)) |
8991 | sq = ctx->sq_data; | |
8992 | ||
8993 | seq_printf(m, "SqThread:\t%d\n", sq ? task_pid_nr(sq->thread) : -1); | |
8994 | seq_printf(m, "SqThreadCpu:\t%d\n", sq ? task_cpu(sq->thread) : -1); | |
87ce955b | 8995 | seq_printf(m, "UserFiles:\t%u\n", ctx->nr_user_files); |
fad8e0de | 8996 | for (i = 0; has_lock && i < ctx->nr_user_files; i++) { |
87ce955b JA |
8997 | struct fixed_file_table *table; |
8998 | struct file *f; | |
8999 | ||
9000 | table = &ctx->file_data->table[i >> IORING_FILE_TABLE_SHIFT]; | |
9001 | f = table->files[i & IORING_FILE_TABLE_MASK]; | |
9002 | if (f) | |
9003 | seq_printf(m, "%5u: %s\n", i, file_dentry(f)->d_iname); | |
9004 | else | |
9005 | seq_printf(m, "%5u: <none>\n", i); | |
9006 | } | |
9007 | seq_printf(m, "UserBufs:\t%u\n", ctx->nr_user_bufs); | |
fad8e0de | 9008 | for (i = 0; has_lock && i < ctx->nr_user_bufs; i++) { |
87ce955b JA |
9009 | struct io_mapped_ubuf *buf = &ctx->user_bufs[i]; |
9010 | ||
9011 | seq_printf(m, "%5u: 0x%llx/%u\n", i, buf->ubuf, | |
9012 | (unsigned int) buf->len); | |
9013 | } | |
fad8e0de | 9014 | if (has_lock && !idr_is_empty(&ctx->personality_idr)) { |
87ce955b JA |
9015 | seq_printf(m, "Personalities:\n"); |
9016 | idr_for_each(&ctx->personality_idr, io_uring_show_cred, m); | |
9017 | } | |
d7718a9d JA |
9018 | seq_printf(m, "PollList:\n"); |
9019 | spin_lock_irq(&ctx->completion_lock); | |
9020 | for (i = 0; i < (1U << ctx->cancel_hash_bits); i++) { | |
9021 | struct hlist_head *list = &ctx->cancel_hash[i]; | |
9022 | struct io_kiocb *req; | |
9023 | ||
9024 | hlist_for_each_entry(req, list, hash_node) | |
9025 | seq_printf(m, " op=%d, task_works=%d\n", req->opcode, | |
9026 | req->task->task_works != NULL); | |
9027 | } | |
9028 | spin_unlock_irq(&ctx->completion_lock); | |
fad8e0de JA |
9029 | if (has_lock) |
9030 | mutex_unlock(&ctx->uring_lock); | |
87ce955b JA |
9031 | } |
9032 | ||
9033 | static void io_uring_show_fdinfo(struct seq_file *m, struct file *f) | |
9034 | { | |
9035 | struct io_ring_ctx *ctx = f->private_data; | |
9036 | ||
9037 | if (percpu_ref_tryget(&ctx->refs)) { | |
9038 | __io_uring_show_fdinfo(ctx, m); | |
9039 | percpu_ref_put(&ctx->refs); | |
9040 | } | |
9041 | } | |
bebdb65e | 9042 | #endif |
87ce955b | 9043 | |
2b188cc1 JA |
9044 | static const struct file_operations io_uring_fops = { |
9045 | .release = io_uring_release, | |
fcb323cc | 9046 | .flush = io_uring_flush, |
2b188cc1 | 9047 | .mmap = io_uring_mmap, |
6c5c240e RP |
9048 | #ifndef CONFIG_MMU |
9049 | .get_unmapped_area = io_uring_nommu_get_unmapped_area, | |
9050 | .mmap_capabilities = io_uring_nommu_mmap_capabilities, | |
9051 | #endif | |
2b188cc1 JA |
9052 | .poll = io_uring_poll, |
9053 | .fasync = io_uring_fasync, | |
bebdb65e | 9054 | #ifdef CONFIG_PROC_FS |
87ce955b | 9055 | .show_fdinfo = io_uring_show_fdinfo, |
bebdb65e | 9056 | #endif |
2b188cc1 JA |
9057 | }; |
9058 | ||
9059 | static int io_allocate_scq_urings(struct io_ring_ctx *ctx, | |
9060 | struct io_uring_params *p) | |
9061 | { | |
75b28aff HV |
9062 | struct io_rings *rings; |
9063 | size_t size, sq_array_offset; | |
2b188cc1 | 9064 | |
bd740481 JA |
9065 | /* make sure these are sane, as we already accounted them */ |
9066 | ctx->sq_entries = p->sq_entries; | |
9067 | ctx->cq_entries = p->cq_entries; | |
9068 | ||
75b28aff HV |
9069 | size = rings_size(p->sq_entries, p->cq_entries, &sq_array_offset); |
9070 | if (size == SIZE_MAX) | |
9071 | return -EOVERFLOW; | |
9072 | ||
9073 | rings = io_mem_alloc(size); | |
9074 | if (!rings) | |
2b188cc1 JA |
9075 | return -ENOMEM; |
9076 | ||
75b28aff HV |
9077 | ctx->rings = rings; |
9078 | ctx->sq_array = (u32 *)((char *)rings + sq_array_offset); | |
9079 | rings->sq_ring_mask = p->sq_entries - 1; | |
9080 | rings->cq_ring_mask = p->cq_entries - 1; | |
9081 | rings->sq_ring_entries = p->sq_entries; | |
9082 | rings->cq_ring_entries = p->cq_entries; | |
9083 | ctx->sq_mask = rings->sq_ring_mask; | |
9084 | ctx->cq_mask = rings->cq_ring_mask; | |
2b188cc1 JA |
9085 | |
9086 | size = array_size(sizeof(struct io_uring_sqe), p->sq_entries); | |
eb065d30 JA |
9087 | if (size == SIZE_MAX) { |
9088 | io_mem_free(ctx->rings); | |
9089 | ctx->rings = NULL; | |
2b188cc1 | 9090 | return -EOVERFLOW; |
eb065d30 | 9091 | } |
2b188cc1 JA |
9092 | |
9093 | ctx->sq_sqes = io_mem_alloc(size); | |
eb065d30 JA |
9094 | if (!ctx->sq_sqes) { |
9095 | io_mem_free(ctx->rings); | |
9096 | ctx->rings = NULL; | |
2b188cc1 | 9097 | return -ENOMEM; |
eb065d30 | 9098 | } |
2b188cc1 | 9099 | |
2b188cc1 JA |
9100 | return 0; |
9101 | } | |
9102 | ||
9103 | /* | |
9104 | * Allocate an anonymous fd, this is what constitutes the application | |
9105 | * visible backing of an io_uring instance. The application mmaps this | |
9106 | * fd to gain access to the SQ/CQ ring details. If UNIX sockets are enabled, | |
9107 | * we have to tie this fd to a socket for file garbage collection purposes. | |
9108 | */ | |
9109 | static int io_uring_get_fd(struct io_ring_ctx *ctx) | |
9110 | { | |
9111 | struct file *file; | |
9112 | int ret; | |
9113 | ||
9114 | #if defined(CONFIG_UNIX) | |
9115 | ret = sock_create_kern(&init_net, PF_UNIX, SOCK_RAW, IPPROTO_IP, | |
9116 | &ctx->ring_sock); | |
9117 | if (ret) | |
9118 | return ret; | |
9119 | #endif | |
9120 | ||
9121 | ret = get_unused_fd_flags(O_RDWR | O_CLOEXEC); | |
9122 | if (ret < 0) | |
9123 | goto err; | |
9124 | ||
9125 | file = anon_inode_getfile("[io_uring]", &io_uring_fops, ctx, | |
9126 | O_RDWR | O_CLOEXEC); | |
9127 | if (IS_ERR(file)) { | |
0f212204 | 9128 | err_fd: |
2b188cc1 JA |
9129 | put_unused_fd(ret); |
9130 | ret = PTR_ERR(file); | |
9131 | goto err; | |
9132 | } | |
9133 | ||
9134 | #if defined(CONFIG_UNIX) | |
9135 | ctx->ring_sock->file = file; | |
9136 | #endif | |
0f212204 JA |
9137 | if (unlikely(io_uring_add_task_file(file))) { |
9138 | file = ERR_PTR(-ENOMEM); | |
9139 | goto err_fd; | |
9140 | } | |
2b188cc1 JA |
9141 | fd_install(ret, file); |
9142 | return ret; | |
9143 | err: | |
9144 | #if defined(CONFIG_UNIX) | |
9145 | sock_release(ctx->ring_sock); | |
9146 | ctx->ring_sock = NULL; | |
9147 | #endif | |
9148 | return ret; | |
9149 | } | |
9150 | ||
7f13657d XW |
9151 | static int io_uring_create(unsigned entries, struct io_uring_params *p, |
9152 | struct io_uring_params __user *params) | |
2b188cc1 JA |
9153 | { |
9154 | struct user_struct *user = NULL; | |
9155 | struct io_ring_ctx *ctx; | |
aad5d8da | 9156 | bool limit_mem; |
2b188cc1 JA |
9157 | int ret; |
9158 | ||
8110c1a6 | 9159 | if (!entries) |
2b188cc1 | 9160 | return -EINVAL; |
8110c1a6 JA |
9161 | if (entries > IORING_MAX_ENTRIES) { |
9162 | if (!(p->flags & IORING_SETUP_CLAMP)) | |
9163 | return -EINVAL; | |
9164 | entries = IORING_MAX_ENTRIES; | |
9165 | } | |
2b188cc1 JA |
9166 | |
9167 | /* | |
9168 | * Use twice as many entries for the CQ ring. It's possible for the | |
9169 | * application to drive a higher depth than the size of the SQ ring, | |
9170 | * since the sqes are only used at submission time. This allows for | |
33a107f0 JA |
9171 | * some flexibility in overcommitting a bit. If the application has |
9172 | * set IORING_SETUP_CQSIZE, it will have passed in the desired number | |
9173 | * of CQ ring entries manually. | |
2b188cc1 JA |
9174 | */ |
9175 | p->sq_entries = roundup_pow_of_two(entries); | |
33a107f0 JA |
9176 | if (p->flags & IORING_SETUP_CQSIZE) { |
9177 | /* | |
9178 | * If IORING_SETUP_CQSIZE is set, we do the same roundup | |
9179 | * to a power-of-two, if it isn't already. We do NOT impose | |
9180 | * any cq vs sq ring sizing. | |
9181 | */ | |
8110c1a6 | 9182 | if (p->cq_entries < p->sq_entries) |
33a107f0 | 9183 | return -EINVAL; |
8110c1a6 JA |
9184 | if (p->cq_entries > IORING_MAX_CQ_ENTRIES) { |
9185 | if (!(p->flags & IORING_SETUP_CLAMP)) | |
9186 | return -EINVAL; | |
9187 | p->cq_entries = IORING_MAX_CQ_ENTRIES; | |
9188 | } | |
33a107f0 JA |
9189 | p->cq_entries = roundup_pow_of_two(p->cq_entries); |
9190 | } else { | |
9191 | p->cq_entries = 2 * p->sq_entries; | |
9192 | } | |
2b188cc1 JA |
9193 | |
9194 | user = get_uid(current_user()); | |
aad5d8da | 9195 | limit_mem = !capable(CAP_IPC_LOCK); |
2b188cc1 | 9196 | |
aad5d8da | 9197 | if (limit_mem) { |
a087e2b5 | 9198 | ret = __io_account_mem(user, |
2b188cc1 JA |
9199 | ring_pages(p->sq_entries, p->cq_entries)); |
9200 | if (ret) { | |
9201 | free_uid(user); | |
9202 | return ret; | |
9203 | } | |
9204 | } | |
9205 | ||
9206 | ctx = io_ring_ctx_alloc(p); | |
9207 | if (!ctx) { | |
aad5d8da | 9208 | if (limit_mem) |
a087e2b5 | 9209 | __io_unaccount_mem(user, ring_pages(p->sq_entries, |
2b188cc1 JA |
9210 | p->cq_entries)); |
9211 | free_uid(user); | |
9212 | return -ENOMEM; | |
9213 | } | |
9214 | ctx->compat = in_compat_syscall(); | |
2b188cc1 | 9215 | ctx->user = user; |
0b8c0ec7 | 9216 | ctx->creds = get_current_cred(); |
4ea33a97 JA |
9217 | #ifdef CONFIG_AUDIT |
9218 | ctx->loginuid = current->loginuid; | |
9219 | ctx->sessionid = current->sessionid; | |
9220 | #endif | |
2aede0e4 JA |
9221 | ctx->sqo_task = get_task_struct(current); |
9222 | ||
9223 | /* | |
9224 | * This is just grabbed for accounting purposes. When a process exits, | |
9225 | * the mm is exited and dropped before the files, hence we need to hang | |
9226 | * on to this mm purely for the purposes of being able to unaccount | |
9227 | * memory (locked/pinned vm). It's not used for anything else. | |
9228 | */ | |
6b7898eb | 9229 | mmgrab(current->mm); |
2aede0e4 | 9230 | ctx->mm_account = current->mm; |
6b7898eb | 9231 | |
91d8f519 DZ |
9232 | #ifdef CONFIG_BLK_CGROUP |
9233 | /* | |
9234 | * The sq thread will belong to the original cgroup it was inited in. | |
9235 | * If the cgroup goes offline (e.g. disabling the io controller), then | |
9236 | * issued bios will be associated with the closest cgroup later in the | |
9237 | * block layer. | |
9238 | */ | |
9239 | rcu_read_lock(); | |
9240 | ctx->sqo_blkcg_css = blkcg_css(); | |
9241 | ret = css_tryget_online(ctx->sqo_blkcg_css); | |
9242 | rcu_read_unlock(); | |
9243 | if (!ret) { | |
9244 | /* don't init against a dying cgroup, have the user try again */ | |
9245 | ctx->sqo_blkcg_css = NULL; | |
9246 | ret = -ENODEV; | |
9247 | goto err; | |
9248 | } | |
9249 | #endif | |
6b7898eb | 9250 | |
f74441e6 JA |
9251 | /* |
9252 | * Account memory _before_ installing the file descriptor. Once | |
9253 | * the descriptor is installed, it can get closed at any time. Also | |
9254 | * do this before hitting the general error path, as ring freeing | |
9255 | * will un-account as well. | |
9256 | */ | |
9257 | io_account_mem(ctx, ring_pages(p->sq_entries, p->cq_entries), | |
9258 | ACCT_LOCKED); | |
9259 | ctx->limit_mem = limit_mem; | |
9260 | ||
2b188cc1 JA |
9261 | ret = io_allocate_scq_urings(ctx, p); |
9262 | if (ret) | |
9263 | goto err; | |
9264 | ||
7e84e1c7 | 9265 | ret = io_sq_offload_create(ctx, p); |
2b188cc1 JA |
9266 | if (ret) |
9267 | goto err; | |
9268 | ||
7e84e1c7 SG |
9269 | if (!(p->flags & IORING_SETUP_R_DISABLED)) |
9270 | io_sq_offload_start(ctx); | |
9271 | ||
2b188cc1 | 9272 | memset(&p->sq_off, 0, sizeof(p->sq_off)); |
75b28aff HV |
9273 | p->sq_off.head = offsetof(struct io_rings, sq.head); |
9274 | p->sq_off.tail = offsetof(struct io_rings, sq.tail); | |
9275 | p->sq_off.ring_mask = offsetof(struct io_rings, sq_ring_mask); | |
9276 | p->sq_off.ring_entries = offsetof(struct io_rings, sq_ring_entries); | |
9277 | p->sq_off.flags = offsetof(struct io_rings, sq_flags); | |
9278 | p->sq_off.dropped = offsetof(struct io_rings, sq_dropped); | |
9279 | p->sq_off.array = (char *)ctx->sq_array - (char *)ctx->rings; | |
2b188cc1 JA |
9280 | |
9281 | memset(&p->cq_off, 0, sizeof(p->cq_off)); | |
75b28aff HV |
9282 | p->cq_off.head = offsetof(struct io_rings, cq.head); |
9283 | p->cq_off.tail = offsetof(struct io_rings, cq.tail); | |
9284 | p->cq_off.ring_mask = offsetof(struct io_rings, cq_ring_mask); | |
9285 | p->cq_off.ring_entries = offsetof(struct io_rings, cq_ring_entries); | |
9286 | p->cq_off.overflow = offsetof(struct io_rings, cq_overflow); | |
9287 | p->cq_off.cqes = offsetof(struct io_rings, cqes); | |
0d9b5b3a | 9288 | p->cq_off.flags = offsetof(struct io_rings, cq_flags); |
ac90f249 | 9289 | |
7f13657d XW |
9290 | p->features = IORING_FEAT_SINGLE_MMAP | IORING_FEAT_NODROP | |
9291 | IORING_FEAT_SUBMIT_STABLE | IORING_FEAT_RW_CUR_POS | | |
5769a351 JX |
9292 | IORING_FEAT_CUR_PERSONALITY | IORING_FEAT_FAST_POLL | |
9293 | IORING_FEAT_POLL_32BITS; | |
7f13657d XW |
9294 | |
9295 | if (copy_to_user(params, p, sizeof(*p))) { | |
9296 | ret = -EFAULT; | |
9297 | goto err; | |
9298 | } | |
d1719f70 | 9299 | |
044c1ab3 JA |
9300 | /* |
9301 | * Install ring fd as the very last thing, so we don't risk someone | |
9302 | * having closed it before we finish setup | |
9303 | */ | |
9304 | ret = io_uring_get_fd(ctx); | |
9305 | if (ret < 0) | |
9306 | goto err; | |
9307 | ||
c826bd7a | 9308 | trace_io_uring_create(ret, ctx, p->sq_entries, p->cq_entries, p->flags); |
2b188cc1 JA |
9309 | return ret; |
9310 | err: | |
9311 | io_ring_ctx_wait_and_kill(ctx); | |
9312 | return ret; | |
9313 | } | |
9314 | ||
9315 | /* | |
9316 | * Sets up an aio uring context, and returns the fd. Applications asks for a | |
9317 | * ring size, we return the actual sq/cq ring sizes (among other things) in the | |
9318 | * params structure passed in. | |
9319 | */ | |
9320 | static long io_uring_setup(u32 entries, struct io_uring_params __user *params) | |
9321 | { | |
9322 | struct io_uring_params p; | |
2b188cc1 JA |
9323 | int i; |
9324 | ||
9325 | if (copy_from_user(&p, params, sizeof(p))) | |
9326 | return -EFAULT; | |
9327 | for (i = 0; i < ARRAY_SIZE(p.resv); i++) { | |
9328 | if (p.resv[i]) | |
9329 | return -EINVAL; | |
9330 | } | |
9331 | ||
6c271ce2 | 9332 | if (p.flags & ~(IORING_SETUP_IOPOLL | IORING_SETUP_SQPOLL | |
8110c1a6 | 9333 | IORING_SETUP_SQ_AFF | IORING_SETUP_CQSIZE | |
7e84e1c7 SG |
9334 | IORING_SETUP_CLAMP | IORING_SETUP_ATTACH_WQ | |
9335 | IORING_SETUP_R_DISABLED)) | |
2b188cc1 JA |
9336 | return -EINVAL; |
9337 | ||
7f13657d | 9338 | return io_uring_create(entries, &p, params); |
2b188cc1 JA |
9339 | } |
9340 | ||
9341 | SYSCALL_DEFINE2(io_uring_setup, u32, entries, | |
9342 | struct io_uring_params __user *, params) | |
9343 | { | |
9344 | return io_uring_setup(entries, params); | |
9345 | } | |
9346 | ||
66f4af93 JA |
9347 | static int io_probe(struct io_ring_ctx *ctx, void __user *arg, unsigned nr_args) |
9348 | { | |
9349 | struct io_uring_probe *p; | |
9350 | size_t size; | |
9351 | int i, ret; | |
9352 | ||
9353 | size = struct_size(p, ops, nr_args); | |
9354 | if (size == SIZE_MAX) | |
9355 | return -EOVERFLOW; | |
9356 | p = kzalloc(size, GFP_KERNEL); | |
9357 | if (!p) | |
9358 | return -ENOMEM; | |
9359 | ||
9360 | ret = -EFAULT; | |
9361 | if (copy_from_user(p, arg, size)) | |
9362 | goto out; | |
9363 | ret = -EINVAL; | |
9364 | if (memchr_inv(p, 0, size)) | |
9365 | goto out; | |
9366 | ||
9367 | p->last_op = IORING_OP_LAST - 1; | |
9368 | if (nr_args > IORING_OP_LAST) | |
9369 | nr_args = IORING_OP_LAST; | |
9370 | ||
9371 | for (i = 0; i < nr_args; i++) { | |
9372 | p->ops[i].op = i; | |
9373 | if (!io_op_defs[i].not_supported) | |
9374 | p->ops[i].flags = IO_URING_OP_SUPPORTED; | |
9375 | } | |
9376 | p->ops_len = i; | |
9377 | ||
9378 | ret = 0; | |
9379 | if (copy_to_user(arg, p, size)) | |
9380 | ret = -EFAULT; | |
9381 | out: | |
9382 | kfree(p); | |
9383 | return ret; | |
9384 | } | |
9385 | ||
071698e1 JA |
9386 | static int io_register_personality(struct io_ring_ctx *ctx) |
9387 | { | |
1e6fa521 JA |
9388 | struct io_identity *id; |
9389 | int ret; | |
071698e1 | 9390 | |
1e6fa521 JA |
9391 | id = kmalloc(sizeof(*id), GFP_KERNEL); |
9392 | if (unlikely(!id)) | |
9393 | return -ENOMEM; | |
9394 | ||
9395 | io_init_identity(id); | |
9396 | id->creds = get_current_cred(); | |
9397 | ||
9398 | ret = idr_alloc_cyclic(&ctx->personality_idr, id, 1, USHRT_MAX, GFP_KERNEL); | |
9399 | if (ret < 0) { | |
9400 | put_cred(id->creds); | |
9401 | kfree(id); | |
9402 | } | |
9403 | return ret; | |
071698e1 JA |
9404 | } |
9405 | ||
9406 | static int io_unregister_personality(struct io_ring_ctx *ctx, unsigned id) | |
9407 | { | |
1e6fa521 | 9408 | struct io_identity *iod; |
071698e1 | 9409 | |
1e6fa521 JA |
9410 | iod = idr_remove(&ctx->personality_idr, id); |
9411 | if (iod) { | |
9412 | put_cred(iod->creds); | |
9413 | if (refcount_dec_and_test(&iod->count)) | |
9414 | kfree(iod); | |
071698e1 JA |
9415 | return 0; |
9416 | } | |
9417 | ||
9418 | return -EINVAL; | |
9419 | } | |
9420 | ||
21b55dbc SG |
9421 | static int io_register_restrictions(struct io_ring_ctx *ctx, void __user *arg, |
9422 | unsigned int nr_args) | |
9423 | { | |
9424 | struct io_uring_restriction *res; | |
9425 | size_t size; | |
9426 | int i, ret; | |
9427 | ||
7e84e1c7 SG |
9428 | /* Restrictions allowed only if rings started disabled */ |
9429 | if (!(ctx->flags & IORING_SETUP_R_DISABLED)) | |
9430 | return -EBADFD; | |
9431 | ||
21b55dbc | 9432 | /* We allow only a single restrictions registration */ |
7e84e1c7 | 9433 | if (ctx->restrictions.registered) |
21b55dbc SG |
9434 | return -EBUSY; |
9435 | ||
9436 | if (!arg || nr_args > IORING_MAX_RESTRICTIONS) | |
9437 | return -EINVAL; | |
9438 | ||
9439 | size = array_size(nr_args, sizeof(*res)); | |
9440 | if (size == SIZE_MAX) | |
9441 | return -EOVERFLOW; | |
9442 | ||
9443 | res = memdup_user(arg, size); | |
9444 | if (IS_ERR(res)) | |
9445 | return PTR_ERR(res); | |
9446 | ||
9447 | ret = 0; | |
9448 | ||
9449 | for (i = 0; i < nr_args; i++) { | |
9450 | switch (res[i].opcode) { | |
9451 | case IORING_RESTRICTION_REGISTER_OP: | |
9452 | if (res[i].register_op >= IORING_REGISTER_LAST) { | |
9453 | ret = -EINVAL; | |
9454 | goto out; | |
9455 | } | |
9456 | ||
9457 | __set_bit(res[i].register_op, | |
9458 | ctx->restrictions.register_op); | |
9459 | break; | |
9460 | case IORING_RESTRICTION_SQE_OP: | |
9461 | if (res[i].sqe_op >= IORING_OP_LAST) { | |
9462 | ret = -EINVAL; | |
9463 | goto out; | |
9464 | } | |
9465 | ||
9466 | __set_bit(res[i].sqe_op, ctx->restrictions.sqe_op); | |
9467 | break; | |
9468 | case IORING_RESTRICTION_SQE_FLAGS_ALLOWED: | |
9469 | ctx->restrictions.sqe_flags_allowed = res[i].sqe_flags; | |
9470 | break; | |
9471 | case IORING_RESTRICTION_SQE_FLAGS_REQUIRED: | |
9472 | ctx->restrictions.sqe_flags_required = res[i].sqe_flags; | |
9473 | break; | |
9474 | default: | |
9475 | ret = -EINVAL; | |
9476 | goto out; | |
9477 | } | |
9478 | } | |
9479 | ||
9480 | out: | |
9481 | /* Reset all restrictions if an error happened */ | |
9482 | if (ret != 0) | |
9483 | memset(&ctx->restrictions, 0, sizeof(ctx->restrictions)); | |
9484 | else | |
7e84e1c7 | 9485 | ctx->restrictions.registered = true; |
21b55dbc SG |
9486 | |
9487 | kfree(res); | |
9488 | return ret; | |
9489 | } | |
9490 | ||
7e84e1c7 SG |
9491 | static int io_register_enable_rings(struct io_ring_ctx *ctx) |
9492 | { | |
9493 | if (!(ctx->flags & IORING_SETUP_R_DISABLED)) | |
9494 | return -EBADFD; | |
9495 | ||
9496 | if (ctx->restrictions.registered) | |
9497 | ctx->restricted = 1; | |
9498 | ||
9499 | ctx->flags &= ~IORING_SETUP_R_DISABLED; | |
9500 | ||
9501 | io_sq_offload_start(ctx); | |
9502 | ||
9503 | return 0; | |
9504 | } | |
9505 | ||
071698e1 JA |
9506 | static bool io_register_op_must_quiesce(int op) |
9507 | { | |
9508 | switch (op) { | |
9509 | case IORING_UNREGISTER_FILES: | |
9510 | case IORING_REGISTER_FILES_UPDATE: | |
9511 | case IORING_REGISTER_PROBE: | |
9512 | case IORING_REGISTER_PERSONALITY: | |
9513 | case IORING_UNREGISTER_PERSONALITY: | |
9514 | return false; | |
9515 | default: | |
9516 | return true; | |
9517 | } | |
9518 | } | |
9519 | ||
edafccee JA |
9520 | static int __io_uring_register(struct io_ring_ctx *ctx, unsigned opcode, |
9521 | void __user *arg, unsigned nr_args) | |
b19062a5 JA |
9522 | __releases(ctx->uring_lock) |
9523 | __acquires(ctx->uring_lock) | |
edafccee JA |
9524 | { |
9525 | int ret; | |
9526 | ||
35fa71a0 JA |
9527 | /* |
9528 | * We're inside the ring mutex, if the ref is already dying, then | |
9529 | * someone else killed the ctx or is already going through | |
9530 | * io_uring_register(). | |
9531 | */ | |
9532 | if (percpu_ref_is_dying(&ctx->refs)) | |
9533 | return -ENXIO; | |
9534 | ||
071698e1 | 9535 | if (io_register_op_must_quiesce(opcode)) { |
05f3fb3c | 9536 | percpu_ref_kill(&ctx->refs); |
b19062a5 | 9537 | |
05f3fb3c JA |
9538 | /* |
9539 | * Drop uring mutex before waiting for references to exit. If | |
9540 | * another thread is currently inside io_uring_enter() it might | |
9541 | * need to grab the uring_lock to make progress. If we hold it | |
9542 | * here across the drain wait, then we can deadlock. It's safe | |
9543 | * to drop the mutex here, since no new references will come in | |
9544 | * after we've killed the percpu ref. | |
9545 | */ | |
9546 | mutex_unlock(&ctx->uring_lock); | |
af9c1a44 JA |
9547 | do { |
9548 | ret = wait_for_completion_interruptible(&ctx->ref_comp); | |
9549 | if (!ret) | |
9550 | break; | |
ed6930c9 JA |
9551 | ret = io_run_task_work_sig(); |
9552 | if (ret < 0) | |
9553 | break; | |
af9c1a44 JA |
9554 | } while (1); |
9555 | ||
05f3fb3c | 9556 | mutex_lock(&ctx->uring_lock); |
af9c1a44 | 9557 | |
c150368b JA |
9558 | if (ret) { |
9559 | percpu_ref_resurrect(&ctx->refs); | |
21b55dbc SG |
9560 | goto out_quiesce; |
9561 | } | |
9562 | } | |
9563 | ||
9564 | if (ctx->restricted) { | |
9565 | if (opcode >= IORING_REGISTER_LAST) { | |
9566 | ret = -EINVAL; | |
9567 | goto out; | |
9568 | } | |
9569 | ||
9570 | if (!test_bit(opcode, ctx->restrictions.register_op)) { | |
9571 | ret = -EACCES; | |
c150368b JA |
9572 | goto out; |
9573 | } | |
05f3fb3c | 9574 | } |
edafccee JA |
9575 | |
9576 | switch (opcode) { | |
9577 | case IORING_REGISTER_BUFFERS: | |
9578 | ret = io_sqe_buffer_register(ctx, arg, nr_args); | |
9579 | break; | |
9580 | case IORING_UNREGISTER_BUFFERS: | |
9581 | ret = -EINVAL; | |
9582 | if (arg || nr_args) | |
9583 | break; | |
9584 | ret = io_sqe_buffer_unregister(ctx); | |
9585 | break; | |
6b06314c JA |
9586 | case IORING_REGISTER_FILES: |
9587 | ret = io_sqe_files_register(ctx, arg, nr_args); | |
9588 | break; | |
9589 | case IORING_UNREGISTER_FILES: | |
9590 | ret = -EINVAL; | |
9591 | if (arg || nr_args) | |
9592 | break; | |
9593 | ret = io_sqe_files_unregister(ctx); | |
9594 | break; | |
c3a31e60 JA |
9595 | case IORING_REGISTER_FILES_UPDATE: |
9596 | ret = io_sqe_files_update(ctx, arg, nr_args); | |
9597 | break; | |
9b402849 | 9598 | case IORING_REGISTER_EVENTFD: |
f2842ab5 | 9599 | case IORING_REGISTER_EVENTFD_ASYNC: |
9b402849 JA |
9600 | ret = -EINVAL; |
9601 | if (nr_args != 1) | |
9602 | break; | |
9603 | ret = io_eventfd_register(ctx, arg); | |
f2842ab5 JA |
9604 | if (ret) |
9605 | break; | |
9606 | if (opcode == IORING_REGISTER_EVENTFD_ASYNC) | |
9607 | ctx->eventfd_async = 1; | |
9608 | else | |
9609 | ctx->eventfd_async = 0; | |
9b402849 JA |
9610 | break; |
9611 | case IORING_UNREGISTER_EVENTFD: | |
9612 | ret = -EINVAL; | |
9613 | if (arg || nr_args) | |
9614 | break; | |
9615 | ret = io_eventfd_unregister(ctx); | |
9616 | break; | |
66f4af93 JA |
9617 | case IORING_REGISTER_PROBE: |
9618 | ret = -EINVAL; | |
9619 | if (!arg || nr_args > 256) | |
9620 | break; | |
9621 | ret = io_probe(ctx, arg, nr_args); | |
9622 | break; | |
071698e1 JA |
9623 | case IORING_REGISTER_PERSONALITY: |
9624 | ret = -EINVAL; | |
9625 | if (arg || nr_args) | |
9626 | break; | |
9627 | ret = io_register_personality(ctx); | |
9628 | break; | |
9629 | case IORING_UNREGISTER_PERSONALITY: | |
9630 | ret = -EINVAL; | |
9631 | if (arg) | |
9632 | break; | |
9633 | ret = io_unregister_personality(ctx, nr_args); | |
9634 | break; | |
7e84e1c7 SG |
9635 | case IORING_REGISTER_ENABLE_RINGS: |
9636 | ret = -EINVAL; | |
9637 | if (arg || nr_args) | |
9638 | break; | |
9639 | ret = io_register_enable_rings(ctx); | |
9640 | break; | |
21b55dbc SG |
9641 | case IORING_REGISTER_RESTRICTIONS: |
9642 | ret = io_register_restrictions(ctx, arg, nr_args); | |
9643 | break; | |
edafccee JA |
9644 | default: |
9645 | ret = -EINVAL; | |
9646 | break; | |
9647 | } | |
9648 | ||
21b55dbc | 9649 | out: |
071698e1 | 9650 | if (io_register_op_must_quiesce(opcode)) { |
05f3fb3c | 9651 | /* bring the ctx back to life */ |
05f3fb3c | 9652 | percpu_ref_reinit(&ctx->refs); |
21b55dbc | 9653 | out_quiesce: |
0f158b4c | 9654 | reinit_completion(&ctx->ref_comp); |
05f3fb3c | 9655 | } |
edafccee JA |
9656 | return ret; |
9657 | } | |
9658 | ||
9659 | SYSCALL_DEFINE4(io_uring_register, unsigned int, fd, unsigned int, opcode, | |
9660 | void __user *, arg, unsigned int, nr_args) | |
9661 | { | |
9662 | struct io_ring_ctx *ctx; | |
9663 | long ret = -EBADF; | |
9664 | struct fd f; | |
9665 | ||
9666 | f = fdget(fd); | |
9667 | if (!f.file) | |
9668 | return -EBADF; | |
9669 | ||
9670 | ret = -EOPNOTSUPP; | |
9671 | if (f.file->f_op != &io_uring_fops) | |
9672 | goto out_fput; | |
9673 | ||
9674 | ctx = f.file->private_data; | |
9675 | ||
9676 | mutex_lock(&ctx->uring_lock); | |
9677 | ret = __io_uring_register(ctx, opcode, arg, nr_args); | |
9678 | mutex_unlock(&ctx->uring_lock); | |
c826bd7a DD |
9679 | trace_io_uring_register(ctx, opcode, ctx->nr_user_files, ctx->nr_user_bufs, |
9680 | ctx->cq_ev_fd != NULL, ret); | |
edafccee JA |
9681 | out_fput: |
9682 | fdput(f); | |
9683 | return ret; | |
9684 | } | |
9685 | ||
2b188cc1 JA |
9686 | static int __init io_uring_init(void) |
9687 | { | |
d7f62e82 SM |
9688 | #define __BUILD_BUG_VERIFY_ELEMENT(stype, eoffset, etype, ename) do { \ |
9689 | BUILD_BUG_ON(offsetof(stype, ename) != eoffset); \ | |
9690 | BUILD_BUG_ON(sizeof(etype) != sizeof_field(stype, ename)); \ | |
9691 | } while (0) | |
9692 | ||
9693 | #define BUILD_BUG_SQE_ELEM(eoffset, etype, ename) \ | |
9694 | __BUILD_BUG_VERIFY_ELEMENT(struct io_uring_sqe, eoffset, etype, ename) | |
9695 | BUILD_BUG_ON(sizeof(struct io_uring_sqe) != 64); | |
9696 | BUILD_BUG_SQE_ELEM(0, __u8, opcode); | |
9697 | BUILD_BUG_SQE_ELEM(1, __u8, flags); | |
9698 | BUILD_BUG_SQE_ELEM(2, __u16, ioprio); | |
9699 | BUILD_BUG_SQE_ELEM(4, __s32, fd); | |
9700 | BUILD_BUG_SQE_ELEM(8, __u64, off); | |
9701 | BUILD_BUG_SQE_ELEM(8, __u64, addr2); | |
9702 | BUILD_BUG_SQE_ELEM(16, __u64, addr); | |
7d67af2c | 9703 | BUILD_BUG_SQE_ELEM(16, __u64, splice_off_in); |
d7f62e82 SM |
9704 | BUILD_BUG_SQE_ELEM(24, __u32, len); |
9705 | BUILD_BUG_SQE_ELEM(28, __kernel_rwf_t, rw_flags); | |
9706 | BUILD_BUG_SQE_ELEM(28, /* compat */ int, rw_flags); | |
9707 | BUILD_BUG_SQE_ELEM(28, /* compat */ __u32, rw_flags); | |
9708 | BUILD_BUG_SQE_ELEM(28, __u32, fsync_flags); | |
5769a351 JX |
9709 | BUILD_BUG_SQE_ELEM(28, /* compat */ __u16, poll_events); |
9710 | BUILD_BUG_SQE_ELEM(28, __u32, poll32_events); | |
d7f62e82 SM |
9711 | BUILD_BUG_SQE_ELEM(28, __u32, sync_range_flags); |
9712 | BUILD_BUG_SQE_ELEM(28, __u32, msg_flags); | |
9713 | BUILD_BUG_SQE_ELEM(28, __u32, timeout_flags); | |
9714 | BUILD_BUG_SQE_ELEM(28, __u32, accept_flags); | |
9715 | BUILD_BUG_SQE_ELEM(28, __u32, cancel_flags); | |
9716 | BUILD_BUG_SQE_ELEM(28, __u32, open_flags); | |
9717 | BUILD_BUG_SQE_ELEM(28, __u32, statx_flags); | |
9718 | BUILD_BUG_SQE_ELEM(28, __u32, fadvise_advice); | |
7d67af2c | 9719 | BUILD_BUG_SQE_ELEM(28, __u32, splice_flags); |
d7f62e82 SM |
9720 | BUILD_BUG_SQE_ELEM(32, __u64, user_data); |
9721 | BUILD_BUG_SQE_ELEM(40, __u16, buf_index); | |
9722 | BUILD_BUG_SQE_ELEM(42, __u16, personality); | |
7d67af2c | 9723 | BUILD_BUG_SQE_ELEM(44, __s32, splice_fd_in); |
d7f62e82 | 9724 | |
d3656344 | 9725 | BUILD_BUG_ON(ARRAY_SIZE(io_op_defs) != IORING_OP_LAST); |
84557871 | 9726 | BUILD_BUG_ON(__REQ_F_LAST_BIT >= 8 * sizeof(int)); |
2b188cc1 JA |
9727 | req_cachep = KMEM_CACHE(io_kiocb, SLAB_HWCACHE_ALIGN | SLAB_PANIC); |
9728 | return 0; | |
9729 | }; | |
9730 | __initcall(io_uring_init); |