Commit | Line | Data |
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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> |
2b188cc1 | 83 | |
c826bd7a DD |
84 | #define CREATE_TRACE_POINTS |
85 | #include <trace/events/io_uring.h> | |
86 | ||
2b188cc1 JA |
87 | #include <uapi/linux/io_uring.h> |
88 | ||
89 | #include "internal.h" | |
561fb04a | 90 | #include "io-wq.h" |
2b188cc1 | 91 | |
5277deaa | 92 | #define IORING_MAX_ENTRIES 32768 |
33a107f0 | 93 | #define IORING_MAX_CQ_ENTRIES (2 * IORING_MAX_ENTRIES) |
65e19f54 JA |
94 | |
95 | /* | |
96 | * Shift of 9 is 512 entries, or exactly one page on 64-bit archs | |
97 | */ | |
98 | #define IORING_FILE_TABLE_SHIFT 9 | |
99 | #define IORING_MAX_FILES_TABLE (1U << IORING_FILE_TABLE_SHIFT) | |
100 | #define IORING_FILE_TABLE_MASK (IORING_MAX_FILES_TABLE - 1) | |
101 | #define IORING_MAX_FIXED_FILES (64 * IORING_MAX_FILES_TABLE) | |
2b188cc1 JA |
102 | |
103 | struct io_uring { | |
104 | u32 head ____cacheline_aligned_in_smp; | |
105 | u32 tail ____cacheline_aligned_in_smp; | |
106 | }; | |
107 | ||
1e84b97b | 108 | /* |
75b28aff HV |
109 | * This data is shared with the application through the mmap at offsets |
110 | * IORING_OFF_SQ_RING and IORING_OFF_CQ_RING. | |
1e84b97b SB |
111 | * |
112 | * The offsets to the member fields are published through struct | |
113 | * io_sqring_offsets when calling io_uring_setup. | |
114 | */ | |
75b28aff | 115 | struct io_rings { |
1e84b97b SB |
116 | /* |
117 | * Head and tail offsets into the ring; the offsets need to be | |
118 | * masked to get valid indices. | |
119 | * | |
75b28aff HV |
120 | * The kernel controls head of the sq ring and the tail of the cq ring, |
121 | * and the application controls tail of the sq ring and the head of the | |
122 | * cq ring. | |
1e84b97b | 123 | */ |
75b28aff | 124 | struct io_uring sq, cq; |
1e84b97b | 125 | /* |
75b28aff | 126 | * Bitmasks to apply to head and tail offsets (constant, equals |
1e84b97b SB |
127 | * ring_entries - 1) |
128 | */ | |
75b28aff HV |
129 | u32 sq_ring_mask, cq_ring_mask; |
130 | /* Ring sizes (constant, power of 2) */ | |
131 | u32 sq_ring_entries, cq_ring_entries; | |
1e84b97b SB |
132 | /* |
133 | * Number of invalid entries dropped by the kernel due to | |
134 | * invalid index stored in array | |
135 | * | |
136 | * Written by the kernel, shouldn't be modified by the | |
137 | * application (i.e. get number of "new events" by comparing to | |
138 | * cached value). | |
139 | * | |
140 | * After a new SQ head value was read by the application this | |
141 | * counter includes all submissions that were dropped reaching | |
142 | * the new SQ head (and possibly more). | |
143 | */ | |
75b28aff | 144 | u32 sq_dropped; |
1e84b97b | 145 | /* |
0d9b5b3a | 146 | * Runtime SQ flags |
1e84b97b SB |
147 | * |
148 | * Written by the kernel, shouldn't be modified by the | |
149 | * application. | |
150 | * | |
151 | * The application needs a full memory barrier before checking | |
152 | * for IORING_SQ_NEED_WAKEUP after updating the sq tail. | |
153 | */ | |
75b28aff | 154 | u32 sq_flags; |
0d9b5b3a SG |
155 | /* |
156 | * Runtime CQ flags | |
157 | * | |
158 | * Written by the application, shouldn't be modified by the | |
159 | * kernel. | |
160 | */ | |
161 | u32 cq_flags; | |
1e84b97b SB |
162 | /* |
163 | * Number of completion events lost because the queue was full; | |
164 | * this should be avoided by the application by making sure | |
0b4295b5 | 165 | * there are not more requests pending than there is space in |
1e84b97b SB |
166 | * the completion queue. |
167 | * | |
168 | * Written by the kernel, shouldn't be modified by the | |
169 | * application (i.e. get number of "new events" by comparing to | |
170 | * cached value). | |
171 | * | |
172 | * As completion events come in out of order this counter is not | |
173 | * ordered with any other data. | |
174 | */ | |
75b28aff | 175 | u32 cq_overflow; |
1e84b97b SB |
176 | /* |
177 | * Ring buffer of completion events. | |
178 | * | |
179 | * The kernel writes completion events fresh every time they are | |
180 | * produced, so the application is allowed to modify pending | |
181 | * entries. | |
182 | */ | |
75b28aff | 183 | struct io_uring_cqe cqes[] ____cacheline_aligned_in_smp; |
2b188cc1 JA |
184 | }; |
185 | ||
edafccee JA |
186 | struct io_mapped_ubuf { |
187 | u64 ubuf; | |
188 | size_t len; | |
189 | struct bio_vec *bvec; | |
190 | unsigned int nr_bvecs; | |
191 | }; | |
192 | ||
65e19f54 JA |
193 | struct fixed_file_table { |
194 | struct file **files; | |
31b51510 JA |
195 | }; |
196 | ||
05589553 XW |
197 | struct fixed_file_ref_node { |
198 | struct percpu_ref refs; | |
199 | struct list_head node; | |
200 | struct list_head file_list; | |
201 | struct fixed_file_data *file_data; | |
4a38aed2 | 202 | struct llist_node llist; |
05589553 XW |
203 | }; |
204 | ||
05f3fb3c JA |
205 | struct fixed_file_data { |
206 | struct fixed_file_table *table; | |
207 | struct io_ring_ctx *ctx; | |
208 | ||
05589553 | 209 | struct percpu_ref *cur_refs; |
05f3fb3c | 210 | struct percpu_ref refs; |
05f3fb3c | 211 | struct completion done; |
05589553 XW |
212 | struct list_head ref_list; |
213 | spinlock_t lock; | |
05f3fb3c JA |
214 | }; |
215 | ||
5a2e745d JA |
216 | struct io_buffer { |
217 | struct list_head list; | |
218 | __u64 addr; | |
219 | __s32 len; | |
220 | __u16 bid; | |
221 | }; | |
222 | ||
2b188cc1 JA |
223 | struct io_ring_ctx { |
224 | struct { | |
225 | struct percpu_ref refs; | |
226 | } ____cacheline_aligned_in_smp; | |
227 | ||
228 | struct { | |
229 | unsigned int flags; | |
e1d85334 | 230 | unsigned int compat: 1; |
aad5d8da | 231 | unsigned int limit_mem: 1; |
e1d85334 RD |
232 | unsigned int cq_overflow_flushed: 1; |
233 | unsigned int drain_next: 1; | |
234 | unsigned int eventfd_async: 1; | |
2b188cc1 | 235 | |
75b28aff HV |
236 | /* |
237 | * Ring buffer of indices into array of io_uring_sqe, which is | |
238 | * mmapped by the application using the IORING_OFF_SQES offset. | |
239 | * | |
240 | * This indirection could e.g. be used to assign fixed | |
241 | * io_uring_sqe entries to operations and only submit them to | |
242 | * the queue when needed. | |
243 | * | |
244 | * The kernel modifies neither the indices array nor the entries | |
245 | * array. | |
246 | */ | |
247 | u32 *sq_array; | |
2b188cc1 JA |
248 | unsigned cached_sq_head; |
249 | unsigned sq_entries; | |
250 | unsigned sq_mask; | |
6c271ce2 | 251 | unsigned sq_thread_idle; |
498ccd9e | 252 | unsigned cached_sq_dropped; |
206aefde | 253 | atomic_t cached_cq_overflow; |
ad3eb2c8 | 254 | unsigned long sq_check_overflow; |
de0617e4 JA |
255 | |
256 | struct list_head defer_list; | |
5262f567 | 257 | struct list_head timeout_list; |
1d7bb1d5 | 258 | struct list_head cq_overflow_list; |
fcb323cc JA |
259 | |
260 | wait_queue_head_t inflight_wait; | |
ad3eb2c8 | 261 | struct io_uring_sqe *sq_sqes; |
2b188cc1 JA |
262 | } ____cacheline_aligned_in_smp; |
263 | ||
206aefde JA |
264 | struct io_rings *rings; |
265 | ||
2b188cc1 | 266 | /* IO offload */ |
561fb04a | 267 | struct io_wq *io_wq; |
6c271ce2 | 268 | struct task_struct *sqo_thread; /* if using sq thread polling */ |
2aede0e4 JA |
269 | |
270 | /* | |
271 | * For SQPOLL usage - we hold a reference to the parent task, so we | |
272 | * have access to the ->files | |
273 | */ | |
274 | struct task_struct *sqo_task; | |
275 | ||
276 | /* Only used for accounting purposes */ | |
277 | struct mm_struct *mm_account; | |
278 | ||
6c271ce2 | 279 | wait_queue_head_t sqo_wait; |
75b28aff | 280 | |
6b06314c JA |
281 | /* |
282 | * If used, fixed file set. Writers must ensure that ->refs is dead, | |
283 | * readers must ensure that ->refs is alive as long as the file* is | |
284 | * used. Only updated through io_uring_register(2). | |
285 | */ | |
05f3fb3c | 286 | struct fixed_file_data *file_data; |
6b06314c JA |
287 | unsigned nr_user_files; |
288 | ||
edafccee JA |
289 | /* if used, fixed mapped user buffers */ |
290 | unsigned nr_user_bufs; | |
291 | struct io_mapped_ubuf *user_bufs; | |
292 | ||
2b188cc1 JA |
293 | struct user_struct *user; |
294 | ||
0b8c0ec7 | 295 | const struct cred *creds; |
181e448d | 296 | |
0f158b4c JA |
297 | struct completion ref_comp; |
298 | struct completion sq_thread_comp; | |
206aefde | 299 | |
0ddf92e8 JA |
300 | /* if all else fails... */ |
301 | struct io_kiocb *fallback_req; | |
302 | ||
206aefde JA |
303 | #if defined(CONFIG_UNIX) |
304 | struct socket *ring_sock; | |
305 | #endif | |
306 | ||
5a2e745d JA |
307 | struct idr io_buffer_idr; |
308 | ||
071698e1 JA |
309 | struct idr personality_idr; |
310 | ||
206aefde JA |
311 | struct { |
312 | unsigned cached_cq_tail; | |
313 | unsigned cq_entries; | |
314 | unsigned cq_mask; | |
315 | atomic_t cq_timeouts; | |
ad3eb2c8 | 316 | unsigned long cq_check_overflow; |
206aefde JA |
317 | struct wait_queue_head cq_wait; |
318 | struct fasync_struct *cq_fasync; | |
319 | struct eventfd_ctx *cq_ev_fd; | |
320 | } ____cacheline_aligned_in_smp; | |
2b188cc1 JA |
321 | |
322 | struct { | |
323 | struct mutex uring_lock; | |
324 | wait_queue_head_t wait; | |
325 | } ____cacheline_aligned_in_smp; | |
326 | ||
327 | struct { | |
328 | spinlock_t completion_lock; | |
e94f141b | 329 | |
def596e9 | 330 | /* |
540e32a0 | 331 | * ->iopoll_list is protected by the ctx->uring_lock for |
def596e9 JA |
332 | * io_uring instances that don't use IORING_SETUP_SQPOLL. |
333 | * For SQPOLL, only the single threaded io_sq_thread() will | |
334 | * manipulate the list, hence no extra locking is needed there. | |
335 | */ | |
540e32a0 | 336 | struct list_head iopoll_list; |
78076bb6 JA |
337 | struct hlist_head *cancel_hash; |
338 | unsigned cancel_hash_bits; | |
e94f141b | 339 | bool poll_multi_file; |
31b51510 | 340 | |
fcb323cc JA |
341 | spinlock_t inflight_lock; |
342 | struct list_head inflight_list; | |
2b188cc1 | 343 | } ____cacheline_aligned_in_smp; |
85faa7b8 | 344 | |
4a38aed2 JA |
345 | struct delayed_work file_put_work; |
346 | struct llist_head file_put_llist; | |
347 | ||
85faa7b8 | 348 | struct work_struct exit_work; |
2b188cc1 JA |
349 | }; |
350 | ||
09bb8394 JA |
351 | /* |
352 | * First field must be the file pointer in all the | |
353 | * iocb unions! See also 'struct kiocb' in <linux/fs.h> | |
354 | */ | |
221c5eb2 JA |
355 | struct io_poll_iocb { |
356 | struct file *file; | |
0969e783 JA |
357 | union { |
358 | struct wait_queue_head *head; | |
359 | u64 addr; | |
360 | }; | |
221c5eb2 | 361 | __poll_t events; |
8c838788 | 362 | bool done; |
221c5eb2 | 363 | bool canceled; |
392edb45 | 364 | struct wait_queue_entry wait; |
221c5eb2 JA |
365 | }; |
366 | ||
b5dba59e JA |
367 | struct io_close { |
368 | struct file *file; | |
369 | struct file *put_file; | |
370 | int fd; | |
371 | }; | |
372 | ||
ad8a48ac JA |
373 | struct io_timeout_data { |
374 | struct io_kiocb *req; | |
375 | struct hrtimer timer; | |
376 | struct timespec64 ts; | |
377 | enum hrtimer_mode mode; | |
378 | }; | |
379 | ||
8ed8d3c3 JA |
380 | struct io_accept { |
381 | struct file *file; | |
382 | struct sockaddr __user *addr; | |
383 | int __user *addr_len; | |
384 | int flags; | |
09952e3e | 385 | unsigned long nofile; |
8ed8d3c3 JA |
386 | }; |
387 | ||
388 | struct io_sync { | |
389 | struct file *file; | |
390 | loff_t len; | |
391 | loff_t off; | |
392 | int flags; | |
d63d1b5e | 393 | int mode; |
8ed8d3c3 JA |
394 | }; |
395 | ||
fbf23849 JA |
396 | struct io_cancel { |
397 | struct file *file; | |
398 | u64 addr; | |
399 | }; | |
400 | ||
b29472ee JA |
401 | struct io_timeout { |
402 | struct file *file; | |
403 | u64 addr; | |
404 | int flags; | |
bfe68a22 PB |
405 | u32 off; |
406 | u32 target_seq; | |
135fcde8 | 407 | struct list_head list; |
b29472ee JA |
408 | }; |
409 | ||
9adbd45d JA |
410 | struct io_rw { |
411 | /* NOTE: kiocb has the file as the first member, so don't do it here */ | |
412 | struct kiocb kiocb; | |
413 | u64 addr; | |
414 | u64 len; | |
415 | }; | |
416 | ||
3fbb51c1 JA |
417 | struct io_connect { |
418 | struct file *file; | |
419 | struct sockaddr __user *addr; | |
420 | int addr_len; | |
421 | }; | |
422 | ||
e47293fd JA |
423 | struct io_sr_msg { |
424 | struct file *file; | |
fddaface | 425 | union { |
270a5940 | 426 | struct user_msghdr __user *umsg; |
fddaface JA |
427 | void __user *buf; |
428 | }; | |
e47293fd | 429 | int msg_flags; |
bcda7baa | 430 | int bgid; |
fddaface | 431 | size_t len; |
bcda7baa | 432 | struct io_buffer *kbuf; |
e47293fd JA |
433 | }; |
434 | ||
15b71abe JA |
435 | struct io_open { |
436 | struct file *file; | |
437 | int dfd; | |
15b71abe | 438 | struct filename *filename; |
c12cedf2 | 439 | struct open_how how; |
4022e7af | 440 | unsigned long nofile; |
15b71abe JA |
441 | }; |
442 | ||
05f3fb3c JA |
443 | struct io_files_update { |
444 | struct file *file; | |
445 | u64 arg; | |
446 | u32 nr_args; | |
447 | u32 offset; | |
448 | }; | |
449 | ||
4840e418 JA |
450 | struct io_fadvise { |
451 | struct file *file; | |
452 | u64 offset; | |
453 | u32 len; | |
454 | u32 advice; | |
455 | }; | |
456 | ||
c1ca757b JA |
457 | struct io_madvise { |
458 | struct file *file; | |
459 | u64 addr; | |
460 | u32 len; | |
461 | u32 advice; | |
462 | }; | |
463 | ||
3e4827b0 JA |
464 | struct io_epoll { |
465 | struct file *file; | |
466 | int epfd; | |
467 | int op; | |
468 | int fd; | |
469 | struct epoll_event event; | |
e47293fd JA |
470 | }; |
471 | ||
7d67af2c PB |
472 | struct io_splice { |
473 | struct file *file_out; | |
474 | struct file *file_in; | |
475 | loff_t off_out; | |
476 | loff_t off_in; | |
477 | u64 len; | |
478 | unsigned int flags; | |
479 | }; | |
480 | ||
ddf0322d JA |
481 | struct io_provide_buf { |
482 | struct file *file; | |
483 | __u64 addr; | |
484 | __s32 len; | |
485 | __u32 bgid; | |
486 | __u16 nbufs; | |
487 | __u16 bid; | |
488 | }; | |
489 | ||
1d9e1288 BM |
490 | struct io_statx { |
491 | struct file *file; | |
492 | int dfd; | |
493 | unsigned int mask; | |
494 | unsigned int flags; | |
e62753e4 | 495 | const char __user *filename; |
1d9e1288 BM |
496 | struct statx __user *buffer; |
497 | }; | |
498 | ||
3ca405eb PB |
499 | struct io_completion { |
500 | struct file *file; | |
501 | struct list_head list; | |
0f7e466b | 502 | int cflags; |
3ca405eb PB |
503 | }; |
504 | ||
f499a021 JA |
505 | struct io_async_connect { |
506 | struct sockaddr_storage address; | |
507 | }; | |
508 | ||
03b1230c JA |
509 | struct io_async_msghdr { |
510 | struct iovec fast_iov[UIO_FASTIOV]; | |
511 | struct iovec *iov; | |
512 | struct sockaddr __user *uaddr; | |
513 | struct msghdr msg; | |
b537916c | 514 | struct sockaddr_storage addr; |
03b1230c JA |
515 | }; |
516 | ||
f67676d1 JA |
517 | struct io_async_rw { |
518 | struct iovec fast_iov[UIO_FASTIOV]; | |
ff6165b2 JA |
519 | const struct iovec *free_iovec; |
520 | struct iov_iter iter; | |
227c0c96 | 521 | size_t bytes_done; |
bcf5a063 | 522 | struct wait_page_queue wpq; |
f67676d1 JA |
523 | }; |
524 | ||
1a6b74fc | 525 | struct io_async_ctx { |
f67676d1 JA |
526 | union { |
527 | struct io_async_rw rw; | |
03b1230c | 528 | struct io_async_msghdr msg; |
f499a021 | 529 | struct io_async_connect connect; |
2d28390a | 530 | struct io_timeout_data timeout; |
f67676d1 | 531 | }; |
1a6b74fc JA |
532 | }; |
533 | ||
6b47ee6e PB |
534 | enum { |
535 | REQ_F_FIXED_FILE_BIT = IOSQE_FIXED_FILE_BIT, | |
536 | REQ_F_IO_DRAIN_BIT = IOSQE_IO_DRAIN_BIT, | |
537 | REQ_F_LINK_BIT = IOSQE_IO_LINK_BIT, | |
538 | REQ_F_HARDLINK_BIT = IOSQE_IO_HARDLINK_BIT, | |
539 | REQ_F_FORCE_ASYNC_BIT = IOSQE_ASYNC_BIT, | |
bcda7baa | 540 | REQ_F_BUFFER_SELECT_BIT = IOSQE_BUFFER_SELECT_BIT, |
6b47ee6e | 541 | |
dea3b49c | 542 | REQ_F_LINK_HEAD_BIT, |
6b47ee6e PB |
543 | REQ_F_FAIL_LINK_BIT, |
544 | REQ_F_INFLIGHT_BIT, | |
545 | REQ_F_CUR_POS_BIT, | |
546 | REQ_F_NOWAIT_BIT, | |
6b47ee6e | 547 | REQ_F_LINK_TIMEOUT_BIT, |
6b47ee6e | 548 | REQ_F_ISREG_BIT, |
6b47ee6e | 549 | REQ_F_COMP_LOCKED_BIT, |
99bc4c38 | 550 | REQ_F_NEED_CLEANUP_BIT, |
d7718a9d | 551 | REQ_F_POLLED_BIT, |
bcda7baa | 552 | REQ_F_BUFFER_SELECTED_BIT, |
5b0bbee4 | 553 | REQ_F_NO_FILE_TABLE_BIT, |
7cdaf587 | 554 | REQ_F_WORK_INITIALIZED_BIT, |
84557871 JA |
555 | |
556 | /* not a real bit, just to check we're not overflowing the space */ | |
557 | __REQ_F_LAST_BIT, | |
6b47ee6e PB |
558 | }; |
559 | ||
560 | enum { | |
561 | /* ctx owns file */ | |
562 | REQ_F_FIXED_FILE = BIT(REQ_F_FIXED_FILE_BIT), | |
563 | /* drain existing IO first */ | |
564 | REQ_F_IO_DRAIN = BIT(REQ_F_IO_DRAIN_BIT), | |
565 | /* linked sqes */ | |
566 | REQ_F_LINK = BIT(REQ_F_LINK_BIT), | |
567 | /* doesn't sever on completion < 0 */ | |
568 | REQ_F_HARDLINK = BIT(REQ_F_HARDLINK_BIT), | |
569 | /* IOSQE_ASYNC */ | |
570 | REQ_F_FORCE_ASYNC = BIT(REQ_F_FORCE_ASYNC_BIT), | |
bcda7baa JA |
571 | /* IOSQE_BUFFER_SELECT */ |
572 | REQ_F_BUFFER_SELECT = BIT(REQ_F_BUFFER_SELECT_BIT), | |
6b47ee6e | 573 | |
dea3b49c PB |
574 | /* head of a link */ |
575 | REQ_F_LINK_HEAD = BIT(REQ_F_LINK_HEAD_BIT), | |
6b47ee6e PB |
576 | /* fail rest of links */ |
577 | REQ_F_FAIL_LINK = BIT(REQ_F_FAIL_LINK_BIT), | |
578 | /* on inflight list */ | |
579 | REQ_F_INFLIGHT = BIT(REQ_F_INFLIGHT_BIT), | |
580 | /* read/write uses file position */ | |
581 | REQ_F_CUR_POS = BIT(REQ_F_CUR_POS_BIT), | |
582 | /* must not punt to workers */ | |
583 | REQ_F_NOWAIT = BIT(REQ_F_NOWAIT_BIT), | |
6b47ee6e PB |
584 | /* has linked timeout */ |
585 | REQ_F_LINK_TIMEOUT = BIT(REQ_F_LINK_TIMEOUT_BIT), | |
6b47ee6e PB |
586 | /* regular file */ |
587 | REQ_F_ISREG = BIT(REQ_F_ISREG_BIT), | |
6b47ee6e PB |
588 | /* completion under lock */ |
589 | REQ_F_COMP_LOCKED = BIT(REQ_F_COMP_LOCKED_BIT), | |
99bc4c38 PB |
590 | /* needs cleanup */ |
591 | REQ_F_NEED_CLEANUP = BIT(REQ_F_NEED_CLEANUP_BIT), | |
d7718a9d JA |
592 | /* already went through poll handler */ |
593 | REQ_F_POLLED = BIT(REQ_F_POLLED_BIT), | |
bcda7baa JA |
594 | /* buffer already selected */ |
595 | REQ_F_BUFFER_SELECTED = BIT(REQ_F_BUFFER_SELECTED_BIT), | |
5b0bbee4 JA |
596 | /* doesn't need file table for this request */ |
597 | REQ_F_NO_FILE_TABLE = BIT(REQ_F_NO_FILE_TABLE_BIT), | |
7cdaf587 XW |
598 | /* io_wq_work is initialized */ |
599 | REQ_F_WORK_INITIALIZED = BIT(REQ_F_WORK_INITIALIZED_BIT), | |
d7718a9d JA |
600 | }; |
601 | ||
602 | struct async_poll { | |
603 | struct io_poll_iocb poll; | |
807abcb0 | 604 | struct io_poll_iocb *double_poll; |
6b47ee6e PB |
605 | }; |
606 | ||
09bb8394 JA |
607 | /* |
608 | * NOTE! Each of the iocb union members has the file pointer | |
609 | * as the first entry in their struct definition. So you can | |
610 | * access the file pointer through any of the sub-structs, | |
611 | * or directly as just 'ki_filp' in this struct. | |
612 | */ | |
2b188cc1 | 613 | struct io_kiocb { |
221c5eb2 | 614 | union { |
09bb8394 | 615 | struct file *file; |
9adbd45d | 616 | struct io_rw rw; |
221c5eb2 | 617 | struct io_poll_iocb poll; |
8ed8d3c3 JA |
618 | struct io_accept accept; |
619 | struct io_sync sync; | |
fbf23849 | 620 | struct io_cancel cancel; |
b29472ee | 621 | struct io_timeout timeout; |
3fbb51c1 | 622 | struct io_connect connect; |
e47293fd | 623 | struct io_sr_msg sr_msg; |
15b71abe | 624 | struct io_open open; |
b5dba59e | 625 | struct io_close close; |
05f3fb3c | 626 | struct io_files_update files_update; |
4840e418 | 627 | struct io_fadvise fadvise; |
c1ca757b | 628 | struct io_madvise madvise; |
3e4827b0 | 629 | struct io_epoll epoll; |
7d67af2c | 630 | struct io_splice splice; |
ddf0322d | 631 | struct io_provide_buf pbuf; |
1d9e1288 | 632 | struct io_statx statx; |
3ca405eb PB |
633 | /* use only after cleaning per-op data, see io_clean_op() */ |
634 | struct io_completion compl; | |
221c5eb2 | 635 | }; |
2b188cc1 | 636 | |
1a6b74fc | 637 | struct io_async_ctx *io; |
d625c6ee | 638 | u8 opcode; |
65a6543d XW |
639 | /* polled IO has completed */ |
640 | u8 iopoll_completed; | |
2b188cc1 | 641 | |
4f4eeba8 | 642 | u16 buf_index; |
9cf7c104 | 643 | u32 result; |
4f4eeba8 | 644 | |
010e8e6b PB |
645 | struct io_ring_ctx *ctx; |
646 | unsigned int flags; | |
647 | refcount_t refs; | |
648 | struct task_struct *task; | |
649 | u64 user_data; | |
d7718a9d | 650 | |
010e8e6b | 651 | struct list_head link_list; |
fcb323cc | 652 | |
d21ffe7e PB |
653 | /* |
654 | * 1. used with ctx->iopoll_list with reads/writes | |
655 | * 2. to track reqs with ->files (see io_op_def::file_table) | |
656 | */ | |
010e8e6b PB |
657 | struct list_head inflight_entry; |
658 | ||
659 | struct percpu_ref *fixed_file_refs; | |
660 | struct callback_head task_work; | |
661 | /* for polled requests, i.e. IORING_OP_POLL_ADD and async armed poll */ | |
662 | struct hlist_node hash_node; | |
663 | struct async_poll *apoll; | |
664 | struct io_wq_work work; | |
2b188cc1 | 665 | }; |
05589553 | 666 | |
27dc8338 PB |
667 | struct io_defer_entry { |
668 | struct list_head list; | |
669 | struct io_kiocb *req; | |
9cf7c104 | 670 | u32 seq; |
2b188cc1 JA |
671 | }; |
672 | ||
def596e9 | 673 | #define IO_IOPOLL_BATCH 8 |
2b188cc1 | 674 | |
013538bd JA |
675 | struct io_comp_state { |
676 | unsigned int nr; | |
677 | struct list_head list; | |
678 | struct io_ring_ctx *ctx; | |
679 | }; | |
680 | ||
9a56a232 JA |
681 | struct io_submit_state { |
682 | struct blk_plug plug; | |
683 | ||
2579f913 JA |
684 | /* |
685 | * io_kiocb alloc cache | |
686 | */ | |
687 | void *reqs[IO_IOPOLL_BATCH]; | |
6c8a3134 | 688 | unsigned int free_reqs; |
2579f913 | 689 | |
013538bd JA |
690 | /* |
691 | * Batch completion logic | |
692 | */ | |
693 | struct io_comp_state comp; | |
694 | ||
9a56a232 JA |
695 | /* |
696 | * File reference cache | |
697 | */ | |
698 | struct file *file; | |
699 | unsigned int fd; | |
700 | unsigned int has_refs; | |
9a56a232 JA |
701 | unsigned int ios_left; |
702 | }; | |
703 | ||
d3656344 JA |
704 | struct io_op_def { |
705 | /* needs req->io allocated for deferral/async */ | |
706 | unsigned async_ctx : 1; | |
707 | /* needs current->mm setup, does mm access */ | |
708 | unsigned needs_mm : 1; | |
709 | /* needs req->file assigned */ | |
710 | unsigned needs_file : 1; | |
fd2206e4 JA |
711 | /* don't fail if file grab fails */ |
712 | unsigned needs_file_no_error : 1; | |
d3656344 JA |
713 | /* hash wq insertion if file is a regular file */ |
714 | unsigned hash_reg_file : 1; | |
715 | /* unbound wq insertion if file is a non-regular file */ | |
716 | unsigned unbound_nonreg_file : 1; | |
66f4af93 JA |
717 | /* opcode is not supported by this kernel */ |
718 | unsigned not_supported : 1; | |
f86cd20c JA |
719 | /* needs file table */ |
720 | unsigned file_table : 1; | |
ff002b30 JA |
721 | /* needs ->fs */ |
722 | unsigned needs_fs : 1; | |
8a72758c JA |
723 | /* set if opcode supports polled "wait" */ |
724 | unsigned pollin : 1; | |
725 | unsigned pollout : 1; | |
bcda7baa JA |
726 | /* op supports buffer selection */ |
727 | unsigned buffer_select : 1; | |
57f1a649 | 728 | unsigned needs_fsize : 1; |
d3656344 JA |
729 | }; |
730 | ||
731 | static const struct io_op_def io_op_defs[] = { | |
0463b6c5 PB |
732 | [IORING_OP_NOP] = {}, |
733 | [IORING_OP_READV] = { | |
d3656344 JA |
734 | .async_ctx = 1, |
735 | .needs_mm = 1, | |
736 | .needs_file = 1, | |
737 | .unbound_nonreg_file = 1, | |
8a72758c | 738 | .pollin = 1, |
4d954c25 | 739 | .buffer_select = 1, |
d3656344 | 740 | }, |
0463b6c5 | 741 | [IORING_OP_WRITEV] = { |
d3656344 JA |
742 | .async_ctx = 1, |
743 | .needs_mm = 1, | |
744 | .needs_file = 1, | |
745 | .hash_reg_file = 1, | |
746 | .unbound_nonreg_file = 1, | |
8a72758c | 747 | .pollout = 1, |
57f1a649 | 748 | .needs_fsize = 1, |
d3656344 | 749 | }, |
0463b6c5 | 750 | [IORING_OP_FSYNC] = { |
d3656344 JA |
751 | .needs_file = 1, |
752 | }, | |
0463b6c5 | 753 | [IORING_OP_READ_FIXED] = { |
d3656344 JA |
754 | .needs_file = 1, |
755 | .unbound_nonreg_file = 1, | |
8a72758c | 756 | .pollin = 1, |
d3656344 | 757 | }, |
0463b6c5 | 758 | [IORING_OP_WRITE_FIXED] = { |
d3656344 JA |
759 | .needs_file = 1, |
760 | .hash_reg_file = 1, | |
761 | .unbound_nonreg_file = 1, | |
8a72758c | 762 | .pollout = 1, |
57f1a649 | 763 | .needs_fsize = 1, |
d3656344 | 764 | }, |
0463b6c5 | 765 | [IORING_OP_POLL_ADD] = { |
d3656344 JA |
766 | .needs_file = 1, |
767 | .unbound_nonreg_file = 1, | |
768 | }, | |
0463b6c5 PB |
769 | [IORING_OP_POLL_REMOVE] = {}, |
770 | [IORING_OP_SYNC_FILE_RANGE] = { | |
d3656344 JA |
771 | .needs_file = 1, |
772 | }, | |
0463b6c5 | 773 | [IORING_OP_SENDMSG] = { |
d3656344 JA |
774 | .async_ctx = 1, |
775 | .needs_mm = 1, | |
776 | .needs_file = 1, | |
777 | .unbound_nonreg_file = 1, | |
ff002b30 | 778 | .needs_fs = 1, |
8a72758c | 779 | .pollout = 1, |
d3656344 | 780 | }, |
0463b6c5 | 781 | [IORING_OP_RECVMSG] = { |
d3656344 JA |
782 | .async_ctx = 1, |
783 | .needs_mm = 1, | |
784 | .needs_file = 1, | |
785 | .unbound_nonreg_file = 1, | |
ff002b30 | 786 | .needs_fs = 1, |
8a72758c | 787 | .pollin = 1, |
52de1fe1 | 788 | .buffer_select = 1, |
d3656344 | 789 | }, |
0463b6c5 | 790 | [IORING_OP_TIMEOUT] = { |
d3656344 JA |
791 | .async_ctx = 1, |
792 | .needs_mm = 1, | |
793 | }, | |
0463b6c5 PB |
794 | [IORING_OP_TIMEOUT_REMOVE] = {}, |
795 | [IORING_OP_ACCEPT] = { | |
d3656344 JA |
796 | .needs_mm = 1, |
797 | .needs_file = 1, | |
798 | .unbound_nonreg_file = 1, | |
f86cd20c | 799 | .file_table = 1, |
8a72758c | 800 | .pollin = 1, |
d3656344 | 801 | }, |
0463b6c5 PB |
802 | [IORING_OP_ASYNC_CANCEL] = {}, |
803 | [IORING_OP_LINK_TIMEOUT] = { | |
d3656344 JA |
804 | .async_ctx = 1, |
805 | .needs_mm = 1, | |
806 | }, | |
0463b6c5 | 807 | [IORING_OP_CONNECT] = { |
d3656344 JA |
808 | .async_ctx = 1, |
809 | .needs_mm = 1, | |
810 | .needs_file = 1, | |
811 | .unbound_nonreg_file = 1, | |
8a72758c | 812 | .pollout = 1, |
d3656344 | 813 | }, |
0463b6c5 | 814 | [IORING_OP_FALLOCATE] = { |
d3656344 | 815 | .needs_file = 1, |
57f1a649 | 816 | .needs_fsize = 1, |
d3656344 | 817 | }, |
0463b6c5 | 818 | [IORING_OP_OPENAT] = { |
f86cd20c | 819 | .file_table = 1, |
ff002b30 | 820 | .needs_fs = 1, |
d3656344 | 821 | }, |
0463b6c5 | 822 | [IORING_OP_CLOSE] = { |
fd2206e4 JA |
823 | .needs_file = 1, |
824 | .needs_file_no_error = 1, | |
f86cd20c | 825 | .file_table = 1, |
d3656344 | 826 | }, |
0463b6c5 | 827 | [IORING_OP_FILES_UPDATE] = { |
d3656344 | 828 | .needs_mm = 1, |
f86cd20c | 829 | .file_table = 1, |
d3656344 | 830 | }, |
0463b6c5 | 831 | [IORING_OP_STATX] = { |
d3656344 | 832 | .needs_mm = 1, |
ff002b30 | 833 | .needs_fs = 1, |
5b0bbee4 | 834 | .file_table = 1, |
d3656344 | 835 | }, |
0463b6c5 | 836 | [IORING_OP_READ] = { |
3a6820f2 JA |
837 | .needs_mm = 1, |
838 | .needs_file = 1, | |
839 | .unbound_nonreg_file = 1, | |
8a72758c | 840 | .pollin = 1, |
bcda7baa | 841 | .buffer_select = 1, |
3a6820f2 | 842 | }, |
0463b6c5 | 843 | [IORING_OP_WRITE] = { |
3a6820f2 JA |
844 | .needs_mm = 1, |
845 | .needs_file = 1, | |
846 | .unbound_nonreg_file = 1, | |
8a72758c | 847 | .pollout = 1, |
57f1a649 | 848 | .needs_fsize = 1, |
3a6820f2 | 849 | }, |
0463b6c5 | 850 | [IORING_OP_FADVISE] = { |
4840e418 JA |
851 | .needs_file = 1, |
852 | }, | |
0463b6c5 | 853 | [IORING_OP_MADVISE] = { |
c1ca757b JA |
854 | .needs_mm = 1, |
855 | }, | |
0463b6c5 | 856 | [IORING_OP_SEND] = { |
fddaface JA |
857 | .needs_mm = 1, |
858 | .needs_file = 1, | |
859 | .unbound_nonreg_file = 1, | |
8a72758c | 860 | .pollout = 1, |
fddaface | 861 | }, |
0463b6c5 | 862 | [IORING_OP_RECV] = { |
fddaface JA |
863 | .needs_mm = 1, |
864 | .needs_file = 1, | |
865 | .unbound_nonreg_file = 1, | |
8a72758c | 866 | .pollin = 1, |
bcda7baa | 867 | .buffer_select = 1, |
fddaface | 868 | }, |
0463b6c5 | 869 | [IORING_OP_OPENAT2] = { |
f86cd20c | 870 | .file_table = 1, |
ff002b30 | 871 | .needs_fs = 1, |
cebdb986 | 872 | }, |
3e4827b0 JA |
873 | [IORING_OP_EPOLL_CTL] = { |
874 | .unbound_nonreg_file = 1, | |
875 | .file_table = 1, | |
876 | }, | |
7d67af2c PB |
877 | [IORING_OP_SPLICE] = { |
878 | .needs_file = 1, | |
879 | .hash_reg_file = 1, | |
880 | .unbound_nonreg_file = 1, | |
ddf0322d JA |
881 | }, |
882 | [IORING_OP_PROVIDE_BUFFERS] = {}, | |
067524e9 | 883 | [IORING_OP_REMOVE_BUFFERS] = {}, |
f2a8d5c7 PB |
884 | [IORING_OP_TEE] = { |
885 | .needs_file = 1, | |
886 | .hash_reg_file = 1, | |
887 | .unbound_nonreg_file = 1, | |
888 | }, | |
d3656344 JA |
889 | }; |
890 | ||
2e0464d4 BM |
891 | enum io_mem_account { |
892 | ACCT_LOCKED, | |
893 | ACCT_PINNED, | |
894 | }; | |
895 | ||
81b68a5c PB |
896 | static void __io_complete_rw(struct io_kiocb *req, long res, long res2, |
897 | struct io_comp_state *cs); | |
78e19bbe | 898 | static void io_cqring_fill_event(struct io_kiocb *req, long res); |
ec9c02ad | 899 | static void io_put_req(struct io_kiocb *req); |
c40f6379 | 900 | static void io_double_put_req(struct io_kiocb *req); |
978db57e | 901 | static void __io_double_put_req(struct io_kiocb *req); |
94ae5e77 | 902 | static struct io_kiocb *io_prep_linked_timeout(struct io_kiocb *req); |
7271ef3a | 903 | static void __io_queue_linked_timeout(struct io_kiocb *req); |
94ae5e77 | 904 | static void io_queue_linked_timeout(struct io_kiocb *req); |
05f3fb3c JA |
905 | static int __io_sqe_files_update(struct io_ring_ctx *ctx, |
906 | struct io_uring_files_update *ip, | |
907 | unsigned nr_args); | |
f56040b8 | 908 | static int io_prep_work_files(struct io_kiocb *req); |
3ca405eb | 909 | static void __io_clean_op(struct io_kiocb *req); |
b41e9852 JA |
910 | static int io_file_get(struct io_submit_state *state, struct io_kiocb *req, |
911 | int fd, struct file **out_file, bool fixed); | |
912 | static void __io_queue_sqe(struct io_kiocb *req, | |
f13fad7b JA |
913 | const struct io_uring_sqe *sqe, |
914 | struct io_comp_state *cs); | |
4349f30e | 915 | static void io_file_put_work(struct work_struct *work); |
de0617e4 | 916 | |
b63534c4 JA |
917 | static ssize_t io_import_iovec(int rw, struct io_kiocb *req, |
918 | struct iovec **iovec, struct iov_iter *iter, | |
919 | bool needs_lock); | |
ff6165b2 JA |
920 | static int io_setup_async_rw(struct io_kiocb *req, const struct iovec *iovec, |
921 | const struct iovec *fast_iov, | |
227c0c96 | 922 | struct iov_iter *iter, bool force); |
de0617e4 | 923 | |
2b188cc1 JA |
924 | static struct kmem_cache *req_cachep; |
925 | ||
926 | static const struct file_operations io_uring_fops; | |
927 | ||
928 | struct sock *io_uring_get_socket(struct file *file) | |
929 | { | |
930 | #if defined(CONFIG_UNIX) | |
931 | if (file->f_op == &io_uring_fops) { | |
932 | struct io_ring_ctx *ctx = file->private_data; | |
933 | ||
934 | return ctx->ring_sock->sk; | |
935 | } | |
936 | #endif | |
937 | return NULL; | |
938 | } | |
939 | EXPORT_SYMBOL(io_uring_get_socket); | |
940 | ||
3ca405eb PB |
941 | static inline void io_clean_op(struct io_kiocb *req) |
942 | { | |
bb175342 PB |
943 | if (req->flags & (REQ_F_NEED_CLEANUP | REQ_F_BUFFER_SELECTED | |
944 | REQ_F_INFLIGHT)) | |
3ca405eb PB |
945 | __io_clean_op(req); |
946 | } | |
947 | ||
4349f30e | 948 | static void io_sq_thread_drop_mm(void) |
c40f6379 JA |
949 | { |
950 | struct mm_struct *mm = current->mm; | |
951 | ||
952 | if (mm) { | |
953 | kthread_unuse_mm(mm); | |
954 | mmput(mm); | |
955 | } | |
956 | } | |
957 | ||
958 | static int __io_sq_thread_acquire_mm(struct io_ring_ctx *ctx) | |
959 | { | |
960 | if (!current->mm) { | |
cbcf7214 | 961 | if (unlikely(!(ctx->flags & IORING_SETUP_SQPOLL) || |
2aede0e4 JA |
962 | !ctx->sqo_task->mm || |
963 | !mmget_not_zero(ctx->sqo_task->mm))) | |
c40f6379 | 964 | return -EFAULT; |
2aede0e4 | 965 | kthread_use_mm(ctx->sqo_task->mm); |
c40f6379 JA |
966 | } |
967 | ||
968 | return 0; | |
969 | } | |
970 | ||
971 | static int io_sq_thread_acquire_mm(struct io_ring_ctx *ctx, | |
972 | struct io_kiocb *req) | |
973 | { | |
974 | if (!io_op_defs[req->opcode].needs_mm) | |
975 | return 0; | |
976 | return __io_sq_thread_acquire_mm(ctx); | |
977 | } | |
978 | ||
979 | static inline void req_set_fail_links(struct io_kiocb *req) | |
980 | { | |
981 | if ((req->flags & (REQ_F_LINK | REQ_F_HARDLINK)) == REQ_F_LINK) | |
982 | req->flags |= REQ_F_FAIL_LINK; | |
983 | } | |
4a38aed2 | 984 | |
7cdaf587 XW |
985 | /* |
986 | * Note: must call io_req_init_async() for the first time you | |
987 | * touch any members of io_wq_work. | |
988 | */ | |
989 | static inline void io_req_init_async(struct io_kiocb *req) | |
990 | { | |
991 | if (req->flags & REQ_F_WORK_INITIALIZED) | |
992 | return; | |
993 | ||
994 | memset(&req->work, 0, sizeof(req->work)); | |
995 | req->flags |= REQ_F_WORK_INITIALIZED; | |
996 | } | |
997 | ||
0cdaf760 PB |
998 | static inline bool io_async_submit(struct io_ring_ctx *ctx) |
999 | { | |
1000 | return ctx->flags & IORING_SETUP_SQPOLL; | |
1001 | } | |
1002 | ||
2b188cc1 JA |
1003 | static void io_ring_ctx_ref_free(struct percpu_ref *ref) |
1004 | { | |
1005 | struct io_ring_ctx *ctx = container_of(ref, struct io_ring_ctx, refs); | |
1006 | ||
0f158b4c | 1007 | complete(&ctx->ref_comp); |
2b188cc1 JA |
1008 | } |
1009 | ||
8eb7e2d0 PB |
1010 | static inline bool io_is_timeout_noseq(struct io_kiocb *req) |
1011 | { | |
1012 | return !req->timeout.off; | |
1013 | } | |
1014 | ||
2b188cc1 JA |
1015 | static struct io_ring_ctx *io_ring_ctx_alloc(struct io_uring_params *p) |
1016 | { | |
1017 | struct io_ring_ctx *ctx; | |
78076bb6 | 1018 | int hash_bits; |
2b188cc1 JA |
1019 | |
1020 | ctx = kzalloc(sizeof(*ctx), GFP_KERNEL); | |
1021 | if (!ctx) | |
1022 | return NULL; | |
1023 | ||
0ddf92e8 JA |
1024 | ctx->fallback_req = kmem_cache_alloc(req_cachep, GFP_KERNEL); |
1025 | if (!ctx->fallback_req) | |
1026 | goto err; | |
1027 | ||
78076bb6 JA |
1028 | /* |
1029 | * Use 5 bits less than the max cq entries, that should give us around | |
1030 | * 32 entries per hash list if totally full and uniformly spread. | |
1031 | */ | |
1032 | hash_bits = ilog2(p->cq_entries); | |
1033 | hash_bits -= 5; | |
1034 | if (hash_bits <= 0) | |
1035 | hash_bits = 1; | |
1036 | ctx->cancel_hash_bits = hash_bits; | |
1037 | ctx->cancel_hash = kmalloc((1U << hash_bits) * sizeof(struct hlist_head), | |
1038 | GFP_KERNEL); | |
1039 | if (!ctx->cancel_hash) | |
1040 | goto err; | |
1041 | __hash_init(ctx->cancel_hash, 1U << hash_bits); | |
1042 | ||
21482896 | 1043 | if (percpu_ref_init(&ctx->refs, io_ring_ctx_ref_free, |
206aefde JA |
1044 | PERCPU_REF_ALLOW_REINIT, GFP_KERNEL)) |
1045 | goto err; | |
2b188cc1 JA |
1046 | |
1047 | ctx->flags = p->flags; | |
583863ed | 1048 | init_waitqueue_head(&ctx->sqo_wait); |
2b188cc1 | 1049 | init_waitqueue_head(&ctx->cq_wait); |
1d7bb1d5 | 1050 | INIT_LIST_HEAD(&ctx->cq_overflow_list); |
0f158b4c JA |
1051 | init_completion(&ctx->ref_comp); |
1052 | init_completion(&ctx->sq_thread_comp); | |
5a2e745d | 1053 | idr_init(&ctx->io_buffer_idr); |
071698e1 | 1054 | idr_init(&ctx->personality_idr); |
2b188cc1 JA |
1055 | mutex_init(&ctx->uring_lock); |
1056 | init_waitqueue_head(&ctx->wait); | |
1057 | spin_lock_init(&ctx->completion_lock); | |
540e32a0 | 1058 | INIT_LIST_HEAD(&ctx->iopoll_list); |
de0617e4 | 1059 | INIT_LIST_HEAD(&ctx->defer_list); |
5262f567 | 1060 | INIT_LIST_HEAD(&ctx->timeout_list); |
fcb323cc JA |
1061 | init_waitqueue_head(&ctx->inflight_wait); |
1062 | spin_lock_init(&ctx->inflight_lock); | |
1063 | INIT_LIST_HEAD(&ctx->inflight_list); | |
4a38aed2 JA |
1064 | INIT_DELAYED_WORK(&ctx->file_put_work, io_file_put_work); |
1065 | init_llist_head(&ctx->file_put_llist); | |
2b188cc1 | 1066 | return ctx; |
206aefde | 1067 | err: |
0ddf92e8 JA |
1068 | if (ctx->fallback_req) |
1069 | kmem_cache_free(req_cachep, ctx->fallback_req); | |
78076bb6 | 1070 | kfree(ctx->cancel_hash); |
206aefde JA |
1071 | kfree(ctx); |
1072 | return NULL; | |
2b188cc1 JA |
1073 | } |
1074 | ||
9cf7c104 | 1075 | static bool req_need_defer(struct io_kiocb *req, u32 seq) |
7adf4eaf | 1076 | { |
2bc9930e JA |
1077 | if (unlikely(req->flags & REQ_F_IO_DRAIN)) { |
1078 | struct io_ring_ctx *ctx = req->ctx; | |
a197f664 | 1079 | |
9cf7c104 | 1080 | return seq != ctx->cached_cq_tail |
31af27c7 | 1081 | + atomic_read(&ctx->cached_cq_overflow); |
2bc9930e | 1082 | } |
de0617e4 | 1083 | |
9d858b21 | 1084 | return false; |
de0617e4 JA |
1085 | } |
1086 | ||
de0617e4 | 1087 | static void __io_commit_cqring(struct io_ring_ctx *ctx) |
2b188cc1 | 1088 | { |
75b28aff | 1089 | struct io_rings *rings = ctx->rings; |
2b188cc1 | 1090 | |
07910158 PB |
1091 | /* order cqe stores with ring update */ |
1092 | smp_store_release(&rings->cq.tail, ctx->cached_cq_tail); | |
2b188cc1 | 1093 | |
07910158 PB |
1094 | if (wq_has_sleeper(&ctx->cq_wait)) { |
1095 | wake_up_interruptible(&ctx->cq_wait); | |
1096 | kill_fasync(&ctx->cq_fasync, SIGIO, POLL_IN); | |
2b188cc1 JA |
1097 | } |
1098 | } | |
1099 | ||
51a4cc11 JA |
1100 | /* |
1101 | * Returns true if we need to defer file table putting. This can only happen | |
1102 | * from the error path with REQ_F_COMP_LOCKED set. | |
1103 | */ | |
1104 | static bool io_req_clean_work(struct io_kiocb *req) | |
18d9be1a | 1105 | { |
7cdaf587 | 1106 | if (!(req->flags & REQ_F_WORK_INITIALIZED)) |
51a4cc11 JA |
1107 | return false; |
1108 | ||
1109 | req->flags &= ~REQ_F_WORK_INITIALIZED; | |
7cdaf587 | 1110 | |
cccf0ee8 JA |
1111 | if (req->work.mm) { |
1112 | mmdrop(req->work.mm); | |
1113 | req->work.mm = NULL; | |
1114 | } | |
1115 | if (req->work.creds) { | |
1116 | put_cred(req->work.creds); | |
1117 | req->work.creds = NULL; | |
1118 | } | |
ff002b30 JA |
1119 | if (req->work.fs) { |
1120 | struct fs_struct *fs = req->work.fs; | |
1121 | ||
51a4cc11 JA |
1122 | if (req->flags & REQ_F_COMP_LOCKED) |
1123 | return true; | |
1124 | ||
ff002b30 JA |
1125 | spin_lock(&req->work.fs->lock); |
1126 | if (--fs->users) | |
1127 | fs = NULL; | |
1128 | spin_unlock(&req->work.fs->lock); | |
1129 | if (fs) | |
1130 | free_fs_struct(fs); | |
b65e0dd6 | 1131 | req->work.fs = NULL; |
ff002b30 | 1132 | } |
51a4cc11 JA |
1133 | |
1134 | return false; | |
561fb04a JA |
1135 | } |
1136 | ||
cbdcb435 | 1137 | static void io_prep_async_work(struct io_kiocb *req) |
18d9be1a | 1138 | { |
d3656344 | 1139 | const struct io_op_def *def = &io_op_defs[req->opcode]; |
54a91f3b | 1140 | |
16d59803 PB |
1141 | io_req_init_async(req); |
1142 | ||
d3656344 | 1143 | if (req->flags & REQ_F_ISREG) { |
eefdf30f | 1144 | if (def->hash_reg_file || (req->ctx->flags & IORING_SETUP_IOPOLL)) |
8766dd51 | 1145 | io_wq_hash_work(&req->work, file_inode(req->file)); |
d3656344 JA |
1146 | } else { |
1147 | if (def->unbound_nonreg_file) | |
3529d8c2 | 1148 | req->work.flags |= IO_WQ_WORK_UNBOUND; |
54a91f3b | 1149 | } |
dca9cf8b PB |
1150 | if (!req->work.mm && def->needs_mm) { |
1151 | mmgrab(current->mm); | |
1152 | req->work.mm = current->mm; | |
1153 | } | |
1154 | if (!req->work.creds) | |
1155 | req->work.creds = get_current_cred(); | |
1156 | if (!req->work.fs && def->needs_fs) { | |
1157 | spin_lock(¤t->fs->lock); | |
1158 | if (!current->fs->in_exec) { | |
1159 | req->work.fs = current->fs; | |
1160 | req->work.fs->users++; | |
1161 | } else { | |
1162 | req->work.flags |= IO_WQ_WORK_CANCEL; | |
1163 | } | |
1164 | spin_unlock(¤t->fs->lock); | |
1165 | } | |
57f1a649 PB |
1166 | if (def->needs_fsize) |
1167 | req->work.fsize = rlimit(RLIMIT_FSIZE); | |
1168 | else | |
1169 | req->work.fsize = RLIM_INFINITY; | |
561fb04a | 1170 | } |
cccf0ee8 | 1171 | |
cbdcb435 | 1172 | static void io_prep_async_link(struct io_kiocb *req) |
561fb04a | 1173 | { |
cbdcb435 | 1174 | struct io_kiocb *cur; |
54a91f3b | 1175 | |
cbdcb435 PB |
1176 | io_prep_async_work(req); |
1177 | if (req->flags & REQ_F_LINK_HEAD) | |
1178 | list_for_each_entry(cur, &req->link_list, link_list) | |
1179 | io_prep_async_work(cur); | |
561fb04a JA |
1180 | } |
1181 | ||
7271ef3a | 1182 | static struct io_kiocb *__io_queue_async_work(struct io_kiocb *req) |
561fb04a | 1183 | { |
a197f664 | 1184 | struct io_ring_ctx *ctx = req->ctx; |
cbdcb435 | 1185 | struct io_kiocb *link = io_prep_linked_timeout(req); |
561fb04a | 1186 | |
8766dd51 PB |
1187 | trace_io_uring_queue_async_work(ctx, io_wq_is_hashed(&req->work), req, |
1188 | &req->work, req->flags); | |
1189 | io_wq_enqueue(ctx->io_wq, &req->work); | |
7271ef3a | 1190 | return link; |
18d9be1a JA |
1191 | } |
1192 | ||
cbdcb435 PB |
1193 | static void io_queue_async_work(struct io_kiocb *req) |
1194 | { | |
7271ef3a JA |
1195 | struct io_kiocb *link; |
1196 | ||
cbdcb435 PB |
1197 | /* init ->work of the whole link before punting */ |
1198 | io_prep_async_link(req); | |
7271ef3a JA |
1199 | link = __io_queue_async_work(req); |
1200 | ||
1201 | if (link) | |
1202 | io_queue_linked_timeout(link); | |
cbdcb435 PB |
1203 | } |
1204 | ||
5262f567 JA |
1205 | static void io_kill_timeout(struct io_kiocb *req) |
1206 | { | |
1207 | int ret; | |
1208 | ||
2d28390a | 1209 | ret = hrtimer_try_to_cancel(&req->io->timeout.timer); |
5262f567 | 1210 | if (ret != -1) { |
01cec8c1 PB |
1211 | atomic_set(&req->ctx->cq_timeouts, |
1212 | atomic_read(&req->ctx->cq_timeouts) + 1); | |
135fcde8 | 1213 | list_del_init(&req->timeout.list); |
f0e20b89 | 1214 | req->flags |= REQ_F_COMP_LOCKED; |
78e19bbe | 1215 | io_cqring_fill_event(req, 0); |
ec9c02ad | 1216 | io_put_req(req); |
5262f567 JA |
1217 | } |
1218 | } | |
1219 | ||
f3606e3a JA |
1220 | static bool io_task_match(struct io_kiocb *req, struct task_struct *tsk) |
1221 | { | |
1222 | struct io_ring_ctx *ctx = req->ctx; | |
1223 | ||
1224 | if (!tsk || req->task == tsk) | |
1225 | return true; | |
1226 | if ((ctx->flags & IORING_SETUP_SQPOLL) && req->task == ctx->sqo_thread) | |
1227 | return true; | |
1228 | return false; | |
1229 | } | |
1230 | ||
76e1b642 JA |
1231 | /* |
1232 | * Returns true if we found and killed one or more timeouts | |
1233 | */ | |
1234 | static bool io_kill_timeouts(struct io_ring_ctx *ctx, struct task_struct *tsk) | |
5262f567 JA |
1235 | { |
1236 | struct io_kiocb *req, *tmp; | |
76e1b642 | 1237 | int canceled = 0; |
5262f567 JA |
1238 | |
1239 | spin_lock_irq(&ctx->completion_lock); | |
f3606e3a | 1240 | list_for_each_entry_safe(req, tmp, &ctx->timeout_list, timeout.list) { |
76e1b642 | 1241 | if (io_task_match(req, tsk)) { |
f3606e3a | 1242 | io_kill_timeout(req); |
76e1b642 JA |
1243 | canceled++; |
1244 | } | |
f3606e3a | 1245 | } |
5262f567 | 1246 | spin_unlock_irq(&ctx->completion_lock); |
76e1b642 | 1247 | return canceled != 0; |
5262f567 JA |
1248 | } |
1249 | ||
04518945 | 1250 | static void __io_queue_deferred(struct io_ring_ctx *ctx) |
de0617e4 | 1251 | { |
04518945 | 1252 | do { |
27dc8338 PB |
1253 | struct io_defer_entry *de = list_first_entry(&ctx->defer_list, |
1254 | struct io_defer_entry, list); | |
7271ef3a | 1255 | struct io_kiocb *link; |
de0617e4 | 1256 | |
9cf7c104 | 1257 | if (req_need_defer(de->req, de->seq)) |
04518945 | 1258 | break; |
27dc8338 | 1259 | list_del_init(&de->list); |
cbdcb435 | 1260 | /* punt-init is done before queueing for defer */ |
7271ef3a JA |
1261 | link = __io_queue_async_work(de->req); |
1262 | if (link) { | |
1263 | __io_queue_linked_timeout(link); | |
1264 | /* drop submission reference */ | |
1265 | link->flags |= REQ_F_COMP_LOCKED; | |
1266 | io_put_req(link); | |
1267 | } | |
27dc8338 | 1268 | kfree(de); |
04518945 PB |
1269 | } while (!list_empty(&ctx->defer_list)); |
1270 | } | |
1271 | ||
360428f8 | 1272 | static void io_flush_timeouts(struct io_ring_ctx *ctx) |
de0617e4 | 1273 | { |
360428f8 PB |
1274 | while (!list_empty(&ctx->timeout_list)) { |
1275 | struct io_kiocb *req = list_first_entry(&ctx->timeout_list, | |
135fcde8 | 1276 | struct io_kiocb, timeout.list); |
de0617e4 | 1277 | |
8eb7e2d0 | 1278 | if (io_is_timeout_noseq(req)) |
360428f8 | 1279 | break; |
bfe68a22 PB |
1280 | if (req->timeout.target_seq != ctx->cached_cq_tail |
1281 | - atomic_read(&ctx->cq_timeouts)) | |
360428f8 | 1282 | break; |
bfe68a22 | 1283 | |
135fcde8 | 1284 | list_del_init(&req->timeout.list); |
5262f567 | 1285 | io_kill_timeout(req); |
360428f8 PB |
1286 | } |
1287 | } | |
5262f567 | 1288 | |
360428f8 PB |
1289 | static void io_commit_cqring(struct io_ring_ctx *ctx) |
1290 | { | |
1291 | io_flush_timeouts(ctx); | |
de0617e4 JA |
1292 | __io_commit_cqring(ctx); |
1293 | ||
04518945 PB |
1294 | if (unlikely(!list_empty(&ctx->defer_list))) |
1295 | __io_queue_deferred(ctx); | |
de0617e4 JA |
1296 | } |
1297 | ||
2b188cc1 JA |
1298 | static struct io_uring_cqe *io_get_cqring(struct io_ring_ctx *ctx) |
1299 | { | |
75b28aff | 1300 | struct io_rings *rings = ctx->rings; |
2b188cc1 JA |
1301 | unsigned tail; |
1302 | ||
1303 | tail = ctx->cached_cq_tail; | |
115e12e5 SB |
1304 | /* |
1305 | * writes to the cq entry need to come after reading head; the | |
1306 | * control dependency is enough as we're using WRITE_ONCE to | |
1307 | * fill the cq entry | |
1308 | */ | |
75b28aff | 1309 | if (tail - READ_ONCE(rings->cq.head) == rings->cq_ring_entries) |
2b188cc1 JA |
1310 | return NULL; |
1311 | ||
1312 | ctx->cached_cq_tail++; | |
75b28aff | 1313 | return &rings->cqes[tail & ctx->cq_mask]; |
2b188cc1 JA |
1314 | } |
1315 | ||
f2842ab5 JA |
1316 | static inline bool io_should_trigger_evfd(struct io_ring_ctx *ctx) |
1317 | { | |
f0b493e6 JA |
1318 | if (!ctx->cq_ev_fd) |
1319 | return false; | |
7e55a19c SG |
1320 | if (READ_ONCE(ctx->rings->cq_flags) & IORING_CQ_EVENTFD_DISABLED) |
1321 | return false; | |
f2842ab5 JA |
1322 | if (!ctx->eventfd_async) |
1323 | return true; | |
b41e9852 | 1324 | return io_wq_current_is_worker(); |
f2842ab5 JA |
1325 | } |
1326 | ||
b41e9852 | 1327 | static void io_cqring_ev_posted(struct io_ring_ctx *ctx) |
1d7bb1d5 JA |
1328 | { |
1329 | if (waitqueue_active(&ctx->wait)) | |
1330 | wake_up(&ctx->wait); | |
1331 | if (waitqueue_active(&ctx->sqo_wait)) | |
1332 | wake_up(&ctx->sqo_wait); | |
b41e9852 | 1333 | if (io_should_trigger_evfd(ctx)) |
1d7bb1d5 JA |
1334 | eventfd_signal(ctx->cq_ev_fd, 1); |
1335 | } | |
1336 | ||
46930143 PB |
1337 | static void io_cqring_mark_overflow(struct io_ring_ctx *ctx) |
1338 | { | |
1339 | if (list_empty(&ctx->cq_overflow_list)) { | |
1340 | clear_bit(0, &ctx->sq_check_overflow); | |
1341 | clear_bit(0, &ctx->cq_check_overflow); | |
1342 | ctx->rings->sq_flags &= ~IORING_SQ_CQ_OVERFLOW; | |
1343 | } | |
1344 | } | |
1345 | ||
e6c8aa9a JA |
1346 | static inline bool io_match_files(struct io_kiocb *req, |
1347 | struct files_struct *files) | |
1348 | { | |
1349 | if (!files) | |
1350 | return true; | |
1351 | if (req->flags & REQ_F_WORK_INITIALIZED) | |
1352 | return req->work.files == files; | |
1353 | return false; | |
1354 | } | |
1355 | ||
c4a2ed72 | 1356 | /* Returns true if there are no backlogged entries after the flush */ |
e6c8aa9a JA |
1357 | static bool io_cqring_overflow_flush(struct io_ring_ctx *ctx, bool force, |
1358 | struct task_struct *tsk, | |
1359 | struct files_struct *files) | |
1d7bb1d5 JA |
1360 | { |
1361 | struct io_rings *rings = ctx->rings; | |
e6c8aa9a | 1362 | struct io_kiocb *req, *tmp; |
1d7bb1d5 | 1363 | struct io_uring_cqe *cqe; |
1d7bb1d5 JA |
1364 | unsigned long flags; |
1365 | LIST_HEAD(list); | |
1366 | ||
1367 | if (!force) { | |
1368 | if (list_empty_careful(&ctx->cq_overflow_list)) | |
c4a2ed72 | 1369 | return true; |
1d7bb1d5 JA |
1370 | if ((ctx->cached_cq_tail - READ_ONCE(rings->cq.head) == |
1371 | rings->cq_ring_entries)) | |
c4a2ed72 | 1372 | return false; |
1d7bb1d5 JA |
1373 | } |
1374 | ||
1375 | spin_lock_irqsave(&ctx->completion_lock, flags); | |
1376 | ||
1377 | /* if force is set, the ring is going away. always drop after that */ | |
1378 | if (force) | |
69b3e546 | 1379 | ctx->cq_overflow_flushed = 1; |
1d7bb1d5 | 1380 | |
c4a2ed72 | 1381 | cqe = NULL; |
e6c8aa9a JA |
1382 | list_for_each_entry_safe(req, tmp, &ctx->cq_overflow_list, compl.list) { |
1383 | if (tsk && req->task != tsk) | |
1384 | continue; | |
1385 | if (!io_match_files(req, files)) | |
1386 | continue; | |
1387 | ||
1d7bb1d5 JA |
1388 | cqe = io_get_cqring(ctx); |
1389 | if (!cqe && !force) | |
1390 | break; | |
1391 | ||
40d8ddd4 | 1392 | list_move(&req->compl.list, &list); |
1d7bb1d5 JA |
1393 | if (cqe) { |
1394 | WRITE_ONCE(cqe->user_data, req->user_data); | |
1395 | WRITE_ONCE(cqe->res, req->result); | |
0f7e466b | 1396 | WRITE_ONCE(cqe->flags, req->compl.cflags); |
1d7bb1d5 JA |
1397 | } else { |
1398 | WRITE_ONCE(ctx->rings->cq_overflow, | |
1399 | atomic_inc_return(&ctx->cached_cq_overflow)); | |
1400 | } | |
1401 | } | |
1402 | ||
1403 | io_commit_cqring(ctx); | |
46930143 PB |
1404 | io_cqring_mark_overflow(ctx); |
1405 | ||
1d7bb1d5 JA |
1406 | spin_unlock_irqrestore(&ctx->completion_lock, flags); |
1407 | io_cqring_ev_posted(ctx); | |
1408 | ||
1409 | while (!list_empty(&list)) { | |
40d8ddd4 PB |
1410 | req = list_first_entry(&list, struct io_kiocb, compl.list); |
1411 | list_del(&req->compl.list); | |
ec9c02ad | 1412 | io_put_req(req); |
1d7bb1d5 | 1413 | } |
c4a2ed72 JA |
1414 | |
1415 | return cqe != NULL; | |
1d7bb1d5 JA |
1416 | } |
1417 | ||
bcda7baa | 1418 | static void __io_cqring_fill_event(struct io_kiocb *req, long res, long cflags) |
2b188cc1 | 1419 | { |
78e19bbe | 1420 | struct io_ring_ctx *ctx = req->ctx; |
2b188cc1 JA |
1421 | struct io_uring_cqe *cqe; |
1422 | ||
78e19bbe | 1423 | trace_io_uring_complete(ctx, req->user_data, res); |
51c3ff62 | 1424 | |
2b188cc1 JA |
1425 | /* |
1426 | * If we can't get a cq entry, userspace overflowed the | |
1427 | * submission (by quite a lot). Increment the overflow count in | |
1428 | * the ring. | |
1429 | */ | |
1430 | cqe = io_get_cqring(ctx); | |
1d7bb1d5 | 1431 | if (likely(cqe)) { |
78e19bbe | 1432 | WRITE_ONCE(cqe->user_data, req->user_data); |
2b188cc1 | 1433 | WRITE_ONCE(cqe->res, res); |
bcda7baa | 1434 | WRITE_ONCE(cqe->flags, cflags); |
0f212204 JA |
1435 | } else if (ctx->cq_overflow_flushed || req->task->io_uring->in_idle) { |
1436 | /* | |
1437 | * If we're in ring overflow flush mode, or in task cancel mode, | |
1438 | * then we cannot store the request for later flushing, we need | |
1439 | * to drop it on the floor. | |
1440 | */ | |
498ccd9e JA |
1441 | WRITE_ONCE(ctx->rings->cq_overflow, |
1442 | atomic_inc_return(&ctx->cached_cq_overflow)); | |
1d7bb1d5 | 1443 | } else { |
ad3eb2c8 JA |
1444 | if (list_empty(&ctx->cq_overflow_list)) { |
1445 | set_bit(0, &ctx->sq_check_overflow); | |
1446 | set_bit(0, &ctx->cq_check_overflow); | |
6d5f9049 | 1447 | ctx->rings->sq_flags |= IORING_SQ_CQ_OVERFLOW; |
ad3eb2c8 | 1448 | } |
40d8ddd4 | 1449 | io_clean_op(req); |
1d7bb1d5 | 1450 | req->result = res; |
0f7e466b | 1451 | req->compl.cflags = cflags; |
40d8ddd4 PB |
1452 | refcount_inc(&req->refs); |
1453 | list_add_tail(&req->compl.list, &ctx->cq_overflow_list); | |
2b188cc1 JA |
1454 | } |
1455 | } | |
1456 | ||
bcda7baa JA |
1457 | static void io_cqring_fill_event(struct io_kiocb *req, long res) |
1458 | { | |
1459 | __io_cqring_fill_event(req, res, 0); | |
1460 | } | |
1461 | ||
e1e16097 | 1462 | static void io_cqring_add_event(struct io_kiocb *req, long res, long cflags) |
2b188cc1 | 1463 | { |
78e19bbe | 1464 | struct io_ring_ctx *ctx = req->ctx; |
2b188cc1 JA |
1465 | unsigned long flags; |
1466 | ||
1467 | spin_lock_irqsave(&ctx->completion_lock, flags); | |
bcda7baa | 1468 | __io_cqring_fill_event(req, res, cflags); |
2b188cc1 JA |
1469 | io_commit_cqring(ctx); |
1470 | spin_unlock_irqrestore(&ctx->completion_lock, flags); | |
1471 | ||
8c838788 | 1472 | io_cqring_ev_posted(ctx); |
2b188cc1 JA |
1473 | } |
1474 | ||
229a7b63 | 1475 | static void io_submit_flush_completions(struct io_comp_state *cs) |
bcda7baa | 1476 | { |
229a7b63 JA |
1477 | struct io_ring_ctx *ctx = cs->ctx; |
1478 | ||
1479 | spin_lock_irq(&ctx->completion_lock); | |
1480 | while (!list_empty(&cs->list)) { | |
1481 | struct io_kiocb *req; | |
1482 | ||
3ca405eb PB |
1483 | req = list_first_entry(&cs->list, struct io_kiocb, compl.list); |
1484 | list_del(&req->compl.list); | |
0f7e466b | 1485 | __io_cqring_fill_event(req, req->result, req->compl.cflags); |
229a7b63 JA |
1486 | if (!(req->flags & REQ_F_LINK_HEAD)) { |
1487 | req->flags |= REQ_F_COMP_LOCKED; | |
1488 | io_put_req(req); | |
1489 | } else { | |
1490 | spin_unlock_irq(&ctx->completion_lock); | |
1491 | io_put_req(req); | |
1492 | spin_lock_irq(&ctx->completion_lock); | |
1493 | } | |
1494 | } | |
1495 | io_commit_cqring(ctx); | |
1496 | spin_unlock_irq(&ctx->completion_lock); | |
1497 | ||
1498 | io_cqring_ev_posted(ctx); | |
1499 | cs->nr = 0; | |
1500 | } | |
1501 | ||
1502 | static void __io_req_complete(struct io_kiocb *req, long res, unsigned cflags, | |
1503 | struct io_comp_state *cs) | |
1504 | { | |
1505 | if (!cs) { | |
1506 | io_cqring_add_event(req, res, cflags); | |
1507 | io_put_req(req); | |
1508 | } else { | |
3ca405eb | 1509 | io_clean_op(req); |
229a7b63 | 1510 | req->result = res; |
0f7e466b | 1511 | req->compl.cflags = cflags; |
3ca405eb | 1512 | list_add_tail(&req->compl.list, &cs->list); |
229a7b63 JA |
1513 | if (++cs->nr >= 32) |
1514 | io_submit_flush_completions(cs); | |
1515 | } | |
e1e16097 JA |
1516 | } |
1517 | ||
1518 | static void io_req_complete(struct io_kiocb *req, long res) | |
bcda7baa | 1519 | { |
229a7b63 | 1520 | __io_req_complete(req, res, 0, NULL); |
bcda7baa JA |
1521 | } |
1522 | ||
0ddf92e8 JA |
1523 | static inline bool io_is_fallback_req(struct io_kiocb *req) |
1524 | { | |
1525 | return req == (struct io_kiocb *) | |
1526 | ((unsigned long) req->ctx->fallback_req & ~1UL); | |
1527 | } | |
1528 | ||
1529 | static struct io_kiocb *io_get_fallback_req(struct io_ring_ctx *ctx) | |
1530 | { | |
1531 | struct io_kiocb *req; | |
1532 | ||
1533 | req = ctx->fallback_req; | |
dd461af6 | 1534 | if (!test_and_set_bit_lock(0, (unsigned long *) &ctx->fallback_req)) |
0ddf92e8 JA |
1535 | return req; |
1536 | ||
1537 | return NULL; | |
1538 | } | |
1539 | ||
0553b8bd PB |
1540 | static struct io_kiocb *io_alloc_req(struct io_ring_ctx *ctx, |
1541 | struct io_submit_state *state) | |
2b188cc1 | 1542 | { |
fd6fab2c | 1543 | gfp_t gfp = GFP_KERNEL | __GFP_NOWARN; |
2b188cc1 JA |
1544 | struct io_kiocb *req; |
1545 | ||
f6b6c7d6 | 1546 | if (!state->free_reqs) { |
2579f913 JA |
1547 | size_t sz; |
1548 | int ret; | |
1549 | ||
1550 | sz = min_t(size_t, state->ios_left, ARRAY_SIZE(state->reqs)); | |
fd6fab2c JA |
1551 | ret = kmem_cache_alloc_bulk(req_cachep, gfp, sz, state->reqs); |
1552 | ||
1553 | /* | |
1554 | * Bulk alloc is all-or-nothing. If we fail to get a batch, | |
1555 | * retry single alloc to be on the safe side. | |
1556 | */ | |
1557 | if (unlikely(ret <= 0)) { | |
1558 | state->reqs[0] = kmem_cache_alloc(req_cachep, gfp); | |
1559 | if (!state->reqs[0]) | |
0ddf92e8 | 1560 | goto fallback; |
fd6fab2c JA |
1561 | ret = 1; |
1562 | } | |
2579f913 | 1563 | state->free_reqs = ret - 1; |
6c8a3134 | 1564 | req = state->reqs[ret - 1]; |
2579f913 | 1565 | } else { |
2579f913 | 1566 | state->free_reqs--; |
6c8a3134 | 1567 | req = state->reqs[state->free_reqs]; |
2b188cc1 JA |
1568 | } |
1569 | ||
2579f913 | 1570 | return req; |
0ddf92e8 | 1571 | fallback: |
0553b8bd | 1572 | return io_get_fallback_req(ctx); |
2b188cc1 JA |
1573 | } |
1574 | ||
8da11c19 PB |
1575 | static inline void io_put_file(struct io_kiocb *req, struct file *file, |
1576 | bool fixed) | |
1577 | { | |
1578 | if (fixed) | |
05589553 | 1579 | percpu_ref_put(req->fixed_file_refs); |
8da11c19 PB |
1580 | else |
1581 | fput(file); | |
1582 | } | |
1583 | ||
51a4cc11 | 1584 | static bool io_dismantle_req(struct io_kiocb *req) |
2b188cc1 | 1585 | { |
3ca405eb | 1586 | io_clean_op(req); |
929a3af9 | 1587 | |
5acbbc8e JA |
1588 | if (req->io) |
1589 | kfree(req->io); | |
8da11c19 PB |
1590 | if (req->file) |
1591 | io_put_file(req, req->file, (req->flags & REQ_F_FIXED_FILE)); | |
fcb323cc | 1592 | |
51a4cc11 | 1593 | return io_req_clean_work(req); |
e65ef56d JA |
1594 | } |
1595 | ||
51a4cc11 | 1596 | static void __io_free_req_finish(struct io_kiocb *req) |
c6ca97b3 | 1597 | { |
0f212204 | 1598 | struct io_uring_task *tctx = req->task->io_uring; |
51a4cc11 | 1599 | struct io_ring_ctx *ctx = req->ctx; |
c6ca97b3 | 1600 | |
0f212204 JA |
1601 | atomic_long_inc(&tctx->req_complete); |
1602 | if (tctx->in_idle) | |
1603 | wake_up(&tctx->wait); | |
e3bc8e9d JA |
1604 | put_task_struct(req->task); |
1605 | ||
b1e50e54 PB |
1606 | if (likely(!io_is_fallback_req(req))) |
1607 | kmem_cache_free(req_cachep, req); | |
1608 | else | |
ecfc5177 PB |
1609 | clear_bit_unlock(0, (unsigned long *) &ctx->fallback_req); |
1610 | percpu_ref_put(&ctx->refs); | |
e65ef56d JA |
1611 | } |
1612 | ||
51a4cc11 JA |
1613 | static void io_req_task_file_table_put(struct callback_head *cb) |
1614 | { | |
1615 | struct io_kiocb *req = container_of(cb, struct io_kiocb, task_work); | |
1616 | struct fs_struct *fs = req->work.fs; | |
1617 | ||
1618 | spin_lock(&req->work.fs->lock); | |
1619 | if (--fs->users) | |
1620 | fs = NULL; | |
1621 | spin_unlock(&req->work.fs->lock); | |
1622 | if (fs) | |
1623 | free_fs_struct(fs); | |
1624 | req->work.fs = NULL; | |
1625 | __io_free_req_finish(req); | |
1626 | } | |
1627 | ||
1628 | static void __io_free_req(struct io_kiocb *req) | |
1629 | { | |
1630 | if (!io_dismantle_req(req)) { | |
1631 | __io_free_req_finish(req); | |
1632 | } else { | |
1633 | int ret; | |
1634 | ||
1635 | init_task_work(&req->task_work, io_req_task_file_table_put); | |
1636 | ret = task_work_add(req->task, &req->task_work, TWA_RESUME); | |
1637 | if (unlikely(ret)) { | |
1638 | struct task_struct *tsk; | |
1639 | ||
1640 | tsk = io_wq_get_task(req->ctx->io_wq); | |
1641 | task_work_add(tsk, &req->task_work, 0); | |
1642 | } | |
1643 | } | |
1644 | } | |
1645 | ||
a197f664 | 1646 | static bool io_link_cancel_timeout(struct io_kiocb *req) |
2665abfd | 1647 | { |
a197f664 | 1648 | struct io_ring_ctx *ctx = req->ctx; |
2665abfd JA |
1649 | int ret; |
1650 | ||
2d28390a | 1651 | ret = hrtimer_try_to_cancel(&req->io->timeout.timer); |
2665abfd | 1652 | if (ret != -1) { |
78e19bbe | 1653 | io_cqring_fill_event(req, -ECANCELED); |
2665abfd | 1654 | io_commit_cqring(ctx); |
dea3b49c | 1655 | req->flags &= ~REQ_F_LINK_HEAD; |
ec9c02ad | 1656 | io_put_req(req); |
2665abfd JA |
1657 | return true; |
1658 | } | |
1659 | ||
1660 | return false; | |
e65ef56d JA |
1661 | } |
1662 | ||
ab0b6451 | 1663 | static bool __io_kill_linked_timeout(struct io_kiocb *req) |
9e645e11 | 1664 | { |
7c86ffee | 1665 | struct io_kiocb *link; |
ab0b6451 | 1666 | bool wake_ev; |
7c86ffee PB |
1667 | |
1668 | if (list_empty(&req->link_list)) | |
ab0b6451 | 1669 | return false; |
7c86ffee PB |
1670 | link = list_first_entry(&req->link_list, struct io_kiocb, link_list); |
1671 | if (link->opcode != IORING_OP_LINK_TIMEOUT) | |
ab0b6451 | 1672 | return false; |
7c86ffee PB |
1673 | |
1674 | list_del_init(&link->link_list); | |
9b7adba9 | 1675 | link->flags |= REQ_F_COMP_LOCKED; |
7c86ffee PB |
1676 | wake_ev = io_link_cancel_timeout(link); |
1677 | req->flags &= ~REQ_F_LINK_TIMEOUT; | |
ab0b6451 JA |
1678 | return wake_ev; |
1679 | } | |
1680 | ||
1681 | static void io_kill_linked_timeout(struct io_kiocb *req) | |
9e645e11 | 1682 | { |
2665abfd | 1683 | struct io_ring_ctx *ctx = req->ctx; |
ab0b6451 | 1684 | bool wake_ev; |
9e645e11 | 1685 | |
ab0b6451 JA |
1686 | if (!(req->flags & REQ_F_COMP_LOCKED)) { |
1687 | unsigned long flags; | |
1688 | ||
1689 | spin_lock_irqsave(&ctx->completion_lock, flags); | |
1690 | wake_ev = __io_kill_linked_timeout(req); | |
7c86ffee | 1691 | spin_unlock_irqrestore(&ctx->completion_lock, flags); |
ab0b6451 JA |
1692 | } else { |
1693 | wake_ev = __io_kill_linked_timeout(req); | |
1694 | } | |
1695 | ||
7c86ffee PB |
1696 | if (wake_ev) |
1697 | io_cqring_ev_posted(ctx); | |
1698 | } | |
1699 | ||
9b5f7bd9 | 1700 | static struct io_kiocb *io_req_link_next(struct io_kiocb *req) |
7c86ffee PB |
1701 | { |
1702 | struct io_kiocb *nxt; | |
4d7dd462 | 1703 | |
9e645e11 JA |
1704 | /* |
1705 | * The list should never be empty when we are called here. But could | |
1706 | * potentially happen if the chain is messed up, check to be on the | |
1707 | * safe side. | |
1708 | */ | |
7c86ffee | 1709 | if (unlikely(list_empty(&req->link_list))) |
9b5f7bd9 | 1710 | return NULL; |
2665abfd | 1711 | |
7c86ffee PB |
1712 | nxt = list_first_entry(&req->link_list, struct io_kiocb, link_list); |
1713 | list_del_init(&req->link_list); | |
1714 | if (!list_empty(&nxt->link_list)) | |
1715 | nxt->flags |= REQ_F_LINK_HEAD; | |
9b5f7bd9 | 1716 | return nxt; |
9e645e11 JA |
1717 | } |
1718 | ||
1719 | /* | |
dea3b49c | 1720 | * Called if REQ_F_LINK_HEAD is set, and we fail the head request |
9e645e11 | 1721 | */ |
7c86ffee | 1722 | static void __io_fail_links(struct io_kiocb *req) |
9e645e11 | 1723 | { |
2665abfd | 1724 | struct io_ring_ctx *ctx = req->ctx; |
9e645e11 JA |
1725 | |
1726 | while (!list_empty(&req->link_list)) { | |
4493233e PB |
1727 | struct io_kiocb *link = list_first_entry(&req->link_list, |
1728 | struct io_kiocb, link_list); | |
9e645e11 | 1729 | |
4493233e | 1730 | list_del_init(&link->link_list); |
c826bd7a | 1731 | trace_io_uring_fail_link(req, link); |
2665abfd | 1732 | |
7c86ffee | 1733 | io_cqring_fill_event(link, -ECANCELED); |
9b7adba9 | 1734 | link->flags |= REQ_F_COMP_LOCKED; |
7c86ffee | 1735 | __io_double_put_req(link); |
5d960724 | 1736 | req->flags &= ~REQ_F_LINK_TIMEOUT; |
9e645e11 | 1737 | } |
2665abfd JA |
1738 | |
1739 | io_commit_cqring(ctx); | |
2665abfd | 1740 | io_cqring_ev_posted(ctx); |
9e645e11 JA |
1741 | } |
1742 | ||
7c86ffee | 1743 | static void io_fail_links(struct io_kiocb *req) |
9e645e11 | 1744 | { |
7c86ffee | 1745 | struct io_ring_ctx *ctx = req->ctx; |
2665abfd | 1746 | |
7c86ffee | 1747 | if (!(req->flags & REQ_F_COMP_LOCKED)) { |
2665abfd JA |
1748 | unsigned long flags; |
1749 | ||
2665abfd | 1750 | spin_lock_irqsave(&ctx->completion_lock, flags); |
7c86ffee | 1751 | __io_fail_links(req); |
2665abfd JA |
1752 | spin_unlock_irqrestore(&ctx->completion_lock, flags); |
1753 | } else { | |
7c86ffee | 1754 | __io_fail_links(req); |
9e645e11 JA |
1755 | } |
1756 | ||
2665abfd | 1757 | io_cqring_ev_posted(ctx); |
9e645e11 JA |
1758 | } |
1759 | ||
3fa5e0f3 | 1760 | static struct io_kiocb *__io_req_find_next(struct io_kiocb *req) |
c69f8dbe | 1761 | { |
9b0d911a | 1762 | req->flags &= ~REQ_F_LINK_HEAD; |
7c86ffee PB |
1763 | if (req->flags & REQ_F_LINK_TIMEOUT) |
1764 | io_kill_linked_timeout(req); | |
944e58bf | 1765 | |
9e645e11 JA |
1766 | /* |
1767 | * If LINK is set, we have dependent requests in this chain. If we | |
1768 | * didn't fail this request, queue the first one up, moving any other | |
1769 | * dependencies to the next request. In case of failure, fail the rest | |
1770 | * of the chain. | |
1771 | */ | |
9b5f7bd9 PB |
1772 | if (likely(!(req->flags & REQ_F_FAIL_LINK))) |
1773 | return io_req_link_next(req); | |
1774 | io_fail_links(req); | |
1775 | return NULL; | |
4d7dd462 | 1776 | } |
9e645e11 | 1777 | |
3fa5e0f3 PB |
1778 | static struct io_kiocb *io_req_find_next(struct io_kiocb *req) |
1779 | { | |
1780 | if (likely(!(req->flags & REQ_F_LINK_HEAD))) | |
1781 | return NULL; | |
1782 | return __io_req_find_next(req); | |
1783 | } | |
1784 | ||
fd7d6de2 JA |
1785 | static int io_req_task_work_add(struct io_kiocb *req, struct callback_head *cb, |
1786 | bool twa_signal_ok) | |
c2c4c83c JA |
1787 | { |
1788 | struct task_struct *tsk = req->task; | |
1789 | struct io_ring_ctx *ctx = req->ctx; | |
0ba9c9ed | 1790 | int ret, notify; |
c2c4c83c | 1791 | |
6200b0ae JA |
1792 | if (tsk->flags & PF_EXITING) |
1793 | return -ESRCH; | |
1794 | ||
c2c4c83c | 1795 | /* |
0ba9c9ed JA |
1796 | * SQPOLL kernel thread doesn't need notification, just a wakeup. For |
1797 | * all other cases, use TWA_SIGNAL unconditionally to ensure we're | |
1798 | * processing task_work. There's no reliable way to tell if TWA_RESUME | |
1799 | * will do the job. | |
c2c4c83c | 1800 | */ |
0ba9c9ed | 1801 | notify = 0; |
fd7d6de2 | 1802 | if (!(ctx->flags & IORING_SETUP_SQPOLL) && twa_signal_ok) |
c2c4c83c JA |
1803 | notify = TWA_SIGNAL; |
1804 | ||
1805 | ret = task_work_add(tsk, cb, notify); | |
1806 | if (!ret) | |
1807 | wake_up_process(tsk); | |
0ba9c9ed | 1808 | |
c2c4c83c JA |
1809 | return ret; |
1810 | } | |
1811 | ||
c40f6379 JA |
1812 | static void __io_req_task_cancel(struct io_kiocb *req, int error) |
1813 | { | |
1814 | struct io_ring_ctx *ctx = req->ctx; | |
1815 | ||
1816 | spin_lock_irq(&ctx->completion_lock); | |
1817 | io_cqring_fill_event(req, error); | |
1818 | io_commit_cqring(ctx); | |
1819 | spin_unlock_irq(&ctx->completion_lock); | |
1820 | ||
1821 | io_cqring_ev_posted(ctx); | |
1822 | req_set_fail_links(req); | |
1823 | io_double_put_req(req); | |
1824 | } | |
1825 | ||
1826 | static void io_req_task_cancel(struct callback_head *cb) | |
1827 | { | |
1828 | struct io_kiocb *req = container_of(cb, struct io_kiocb, task_work); | |
87ceb6a6 | 1829 | struct io_ring_ctx *ctx = req->ctx; |
c40f6379 JA |
1830 | |
1831 | __io_req_task_cancel(req, -ECANCELED); | |
87ceb6a6 | 1832 | percpu_ref_put(&ctx->refs); |
c40f6379 JA |
1833 | } |
1834 | ||
1835 | static void __io_req_task_submit(struct io_kiocb *req) | |
1836 | { | |
1837 | struct io_ring_ctx *ctx = req->ctx; | |
1838 | ||
c40f6379 JA |
1839 | if (!__io_sq_thread_acquire_mm(ctx)) { |
1840 | mutex_lock(&ctx->uring_lock); | |
1841 | __io_queue_sqe(req, NULL, NULL); | |
1842 | mutex_unlock(&ctx->uring_lock); | |
1843 | } else { | |
1844 | __io_req_task_cancel(req, -EFAULT); | |
1845 | } | |
1846 | } | |
1847 | ||
1848 | static void io_req_task_submit(struct callback_head *cb) | |
1849 | { | |
1850 | struct io_kiocb *req = container_of(cb, struct io_kiocb, task_work); | |
6d816e08 | 1851 | struct io_ring_ctx *ctx = req->ctx; |
c40f6379 JA |
1852 | |
1853 | __io_req_task_submit(req); | |
6d816e08 | 1854 | percpu_ref_put(&ctx->refs); |
c40f6379 JA |
1855 | } |
1856 | ||
1857 | static void io_req_task_queue(struct io_kiocb *req) | |
1858 | { | |
c40f6379 JA |
1859 | int ret; |
1860 | ||
1861 | init_task_work(&req->task_work, io_req_task_submit); | |
6d816e08 | 1862 | percpu_ref_get(&req->ctx->refs); |
c40f6379 | 1863 | |
fd7d6de2 | 1864 | ret = io_req_task_work_add(req, &req->task_work, true); |
c40f6379 | 1865 | if (unlikely(ret)) { |
c2c4c83c JA |
1866 | struct task_struct *tsk; |
1867 | ||
c40f6379 JA |
1868 | init_task_work(&req->task_work, io_req_task_cancel); |
1869 | tsk = io_wq_get_task(req->ctx->io_wq); | |
c2c4c83c JA |
1870 | task_work_add(tsk, &req->task_work, 0); |
1871 | wake_up_process(tsk); | |
c40f6379 | 1872 | } |
c40f6379 JA |
1873 | } |
1874 | ||
c3524383 | 1875 | static void io_queue_next(struct io_kiocb *req) |
c69f8dbe | 1876 | { |
9b5f7bd9 | 1877 | struct io_kiocb *nxt = io_req_find_next(req); |
944e58bf PB |
1878 | |
1879 | if (nxt) | |
906a8c3f | 1880 | io_req_task_queue(nxt); |
c69f8dbe JL |
1881 | } |
1882 | ||
c3524383 | 1883 | static void io_free_req(struct io_kiocb *req) |
7a743e22 | 1884 | { |
c3524383 PB |
1885 | io_queue_next(req); |
1886 | __io_free_req(req); | |
1887 | } | |
8766dd51 | 1888 | |
2d6500d4 PB |
1889 | struct req_batch { |
1890 | void *reqs[IO_IOPOLL_BATCH]; | |
1891 | int to_free; | |
7a743e22 | 1892 | |
5af1d13e PB |
1893 | struct task_struct *task; |
1894 | int task_refs; | |
2d6500d4 PB |
1895 | }; |
1896 | ||
5af1d13e PB |
1897 | static inline void io_init_req_batch(struct req_batch *rb) |
1898 | { | |
1899 | rb->to_free = 0; | |
1900 | rb->task_refs = 0; | |
1901 | rb->task = NULL; | |
1902 | } | |
1903 | ||
2d6500d4 PB |
1904 | static void __io_req_free_batch_flush(struct io_ring_ctx *ctx, |
1905 | struct req_batch *rb) | |
1906 | { | |
1907 | kmem_cache_free_bulk(req_cachep, rb->to_free, rb->reqs); | |
1908 | percpu_ref_put_many(&ctx->refs, rb->to_free); | |
1909 | rb->to_free = 0; | |
1910 | } | |
1911 | ||
1912 | static void io_req_free_batch_finish(struct io_ring_ctx *ctx, | |
1913 | struct req_batch *rb) | |
1914 | { | |
1915 | if (rb->to_free) | |
1916 | __io_req_free_batch_flush(ctx, rb); | |
5af1d13e | 1917 | if (rb->task) { |
0f212204 | 1918 | atomic_long_add(rb->task_refs, &rb->task->io_uring->req_complete); |
5af1d13e PB |
1919 | put_task_struct_many(rb->task, rb->task_refs); |
1920 | rb->task = NULL; | |
1921 | } | |
2d6500d4 PB |
1922 | } |
1923 | ||
1924 | static void io_req_free_batch(struct req_batch *rb, struct io_kiocb *req) | |
1925 | { | |
1926 | if (unlikely(io_is_fallback_req(req))) { | |
1927 | io_free_req(req); | |
1928 | return; | |
1929 | } | |
1930 | if (req->flags & REQ_F_LINK_HEAD) | |
1931 | io_queue_next(req); | |
1932 | ||
e3bc8e9d | 1933 | if (req->task != rb->task) { |
0f212204 JA |
1934 | if (rb->task) { |
1935 | atomic_long_add(rb->task_refs, &rb->task->io_uring->req_complete); | |
e3bc8e9d | 1936 | put_task_struct_many(rb->task, rb->task_refs); |
0f212204 | 1937 | } |
e3bc8e9d JA |
1938 | rb->task = req->task; |
1939 | rb->task_refs = 0; | |
5af1d13e | 1940 | } |
e3bc8e9d | 1941 | rb->task_refs++; |
5af1d13e | 1942 | |
51a4cc11 | 1943 | WARN_ON_ONCE(io_dismantle_req(req)); |
2d6500d4 PB |
1944 | rb->reqs[rb->to_free++] = req; |
1945 | if (unlikely(rb->to_free == ARRAY_SIZE(rb->reqs))) | |
1946 | __io_req_free_batch_flush(req->ctx, rb); | |
7a743e22 PB |
1947 | } |
1948 | ||
ba816ad6 JA |
1949 | /* |
1950 | * Drop reference to request, return next in chain (if there is one) if this | |
1951 | * was the last reference to this request. | |
1952 | */ | |
9b5f7bd9 | 1953 | static struct io_kiocb *io_put_req_find_next(struct io_kiocb *req) |
e65ef56d | 1954 | { |
9b5f7bd9 PB |
1955 | struct io_kiocb *nxt = NULL; |
1956 | ||
2a44f467 | 1957 | if (refcount_dec_and_test(&req->refs)) { |
9b5f7bd9 | 1958 | nxt = io_req_find_next(req); |
4d7dd462 | 1959 | __io_free_req(req); |
2a44f467 | 1960 | } |
9b5f7bd9 | 1961 | return nxt; |
2b188cc1 JA |
1962 | } |
1963 | ||
e65ef56d JA |
1964 | static void io_put_req(struct io_kiocb *req) |
1965 | { | |
1966 | if (refcount_dec_and_test(&req->refs)) | |
1967 | io_free_req(req); | |
2b188cc1 JA |
1968 | } |
1969 | ||
f4db7182 | 1970 | static struct io_wq_work *io_steal_work(struct io_kiocb *req) |
7a743e22 | 1971 | { |
6df1db6b | 1972 | struct io_kiocb *nxt; |
f4db7182 | 1973 | |
7a743e22 | 1974 | /* |
f4db7182 PB |
1975 | * A ref is owned by io-wq in which context we're. So, if that's the |
1976 | * last one, it's safe to steal next work. False negatives are Ok, | |
1977 | * it just will be re-punted async in io_put_work() | |
7a743e22 | 1978 | */ |
f4db7182 PB |
1979 | if (refcount_read(&req->refs) != 1) |
1980 | return NULL; | |
7a743e22 | 1981 | |
9b5f7bd9 | 1982 | nxt = io_req_find_next(req); |
6df1db6b | 1983 | return nxt ? &nxt->work : NULL; |
7a743e22 PB |
1984 | } |
1985 | ||
978db57e JA |
1986 | /* |
1987 | * Must only be used if we don't need to care about links, usually from | |
1988 | * within the completion handling itself. | |
1989 | */ | |
1990 | static void __io_double_put_req(struct io_kiocb *req) | |
78e19bbe JA |
1991 | { |
1992 | /* drop both submit and complete references */ | |
1993 | if (refcount_sub_and_test(2, &req->refs)) | |
1994 | __io_free_req(req); | |
1995 | } | |
1996 | ||
978db57e JA |
1997 | static void io_double_put_req(struct io_kiocb *req) |
1998 | { | |
1999 | /* drop both submit and complete references */ | |
2000 | if (refcount_sub_and_test(2, &req->refs)) | |
2001 | io_free_req(req); | |
2002 | } | |
2003 | ||
1d7bb1d5 | 2004 | static unsigned io_cqring_events(struct io_ring_ctx *ctx, bool noflush) |
a3a0e43f | 2005 | { |
84f97dc2 JA |
2006 | struct io_rings *rings = ctx->rings; |
2007 | ||
ad3eb2c8 JA |
2008 | if (test_bit(0, &ctx->cq_check_overflow)) { |
2009 | /* | |
2010 | * noflush == true is from the waitqueue handler, just ensure | |
2011 | * we wake up the task, and the next invocation will flush the | |
2012 | * entries. We cannot safely to it from here. | |
2013 | */ | |
2014 | if (noflush && !list_empty(&ctx->cq_overflow_list)) | |
2015 | return -1U; | |
1d7bb1d5 | 2016 | |
e6c8aa9a | 2017 | io_cqring_overflow_flush(ctx, false, NULL, NULL); |
ad3eb2c8 | 2018 | } |
1d7bb1d5 | 2019 | |
a3a0e43f JA |
2020 | /* See comment at the top of this file */ |
2021 | smp_rmb(); | |
ad3eb2c8 | 2022 | return ctx->cached_cq_tail - READ_ONCE(rings->cq.head); |
a3a0e43f JA |
2023 | } |
2024 | ||
fb5ccc98 PB |
2025 | static inline unsigned int io_sqring_entries(struct io_ring_ctx *ctx) |
2026 | { | |
2027 | struct io_rings *rings = ctx->rings; | |
2028 | ||
2029 | /* make sure SQ entry isn't read before tail */ | |
2030 | return smp_load_acquire(&rings->sq.tail) - ctx->cached_sq_head; | |
2031 | } | |
2032 | ||
8ff069bf | 2033 | static unsigned int io_put_kbuf(struct io_kiocb *req, struct io_buffer *kbuf) |
e94f141b | 2034 | { |
8ff069bf | 2035 | unsigned int cflags; |
e94f141b | 2036 | |
bcda7baa JA |
2037 | cflags = kbuf->bid << IORING_CQE_BUFFER_SHIFT; |
2038 | cflags |= IORING_CQE_F_BUFFER; | |
0e1b6fe3 | 2039 | req->flags &= ~REQ_F_BUFFER_SELECTED; |
bcda7baa JA |
2040 | kfree(kbuf); |
2041 | return cflags; | |
e94f141b JA |
2042 | } |
2043 | ||
8ff069bf | 2044 | static inline unsigned int io_put_rw_kbuf(struct io_kiocb *req) |
bcda7baa | 2045 | { |
4d954c25 | 2046 | struct io_buffer *kbuf; |
bcda7baa | 2047 | |
4d954c25 | 2048 | kbuf = (struct io_buffer *) (unsigned long) req->rw.addr; |
8ff069bf PB |
2049 | return io_put_kbuf(req, kbuf); |
2050 | } | |
2051 | ||
4c6e277c JA |
2052 | static inline bool io_run_task_work(void) |
2053 | { | |
6200b0ae JA |
2054 | /* |
2055 | * Not safe to run on exiting task, and the task_work handling will | |
2056 | * not add work to such a task. | |
2057 | */ | |
2058 | if (unlikely(current->flags & PF_EXITING)) | |
2059 | return false; | |
4c6e277c JA |
2060 | if (current->task_works) { |
2061 | __set_current_state(TASK_RUNNING); | |
2062 | task_work_run(); | |
2063 | return true; | |
2064 | } | |
2065 | ||
2066 | return false; | |
bcda7baa JA |
2067 | } |
2068 | ||
bbde017a XW |
2069 | static void io_iopoll_queue(struct list_head *again) |
2070 | { | |
2071 | struct io_kiocb *req; | |
2072 | ||
2073 | do { | |
d21ffe7e PB |
2074 | req = list_first_entry(again, struct io_kiocb, inflight_entry); |
2075 | list_del(&req->inflight_entry); | |
81b68a5c | 2076 | __io_complete_rw(req, -EAGAIN, 0, NULL); |
bbde017a XW |
2077 | } while (!list_empty(again)); |
2078 | } | |
2079 | ||
def596e9 JA |
2080 | /* |
2081 | * Find and free completed poll iocbs | |
2082 | */ | |
2083 | static void io_iopoll_complete(struct io_ring_ctx *ctx, unsigned int *nr_events, | |
2084 | struct list_head *done) | |
2085 | { | |
8237e045 | 2086 | struct req_batch rb; |
def596e9 | 2087 | struct io_kiocb *req; |
bbde017a XW |
2088 | LIST_HEAD(again); |
2089 | ||
2090 | /* order with ->result store in io_complete_rw_iopoll() */ | |
2091 | smp_rmb(); | |
def596e9 | 2092 | |
5af1d13e | 2093 | io_init_req_batch(&rb); |
def596e9 | 2094 | while (!list_empty(done)) { |
bcda7baa JA |
2095 | int cflags = 0; |
2096 | ||
d21ffe7e | 2097 | req = list_first_entry(done, struct io_kiocb, inflight_entry); |
bbde017a | 2098 | if (READ_ONCE(req->result) == -EAGAIN) { |
56450c20 | 2099 | req->result = 0; |
bbde017a | 2100 | req->iopoll_completed = 0; |
d21ffe7e | 2101 | list_move_tail(&req->inflight_entry, &again); |
bbde017a XW |
2102 | continue; |
2103 | } | |
d21ffe7e | 2104 | list_del(&req->inflight_entry); |
def596e9 | 2105 | |
bcda7baa | 2106 | if (req->flags & REQ_F_BUFFER_SELECTED) |
8ff069bf | 2107 | cflags = io_put_rw_kbuf(req); |
bcda7baa JA |
2108 | |
2109 | __io_cqring_fill_event(req, req->result, cflags); | |
def596e9 JA |
2110 | (*nr_events)++; |
2111 | ||
c3524383 | 2112 | if (refcount_dec_and_test(&req->refs)) |
2d6500d4 | 2113 | io_req_free_batch(&rb, req); |
def596e9 | 2114 | } |
def596e9 | 2115 | |
09bb8394 | 2116 | io_commit_cqring(ctx); |
32b2244a XW |
2117 | if (ctx->flags & IORING_SETUP_SQPOLL) |
2118 | io_cqring_ev_posted(ctx); | |
2d6500d4 | 2119 | io_req_free_batch_finish(ctx, &rb); |
581f9810 | 2120 | |
bbde017a XW |
2121 | if (!list_empty(&again)) |
2122 | io_iopoll_queue(&again); | |
581f9810 BM |
2123 | } |
2124 | ||
def596e9 JA |
2125 | static int io_do_iopoll(struct io_ring_ctx *ctx, unsigned int *nr_events, |
2126 | long min) | |
2127 | { | |
2128 | struct io_kiocb *req, *tmp; | |
2129 | LIST_HEAD(done); | |
2130 | bool spin; | |
2131 | int ret; | |
2132 | ||
2133 | /* | |
2134 | * Only spin for completions if we don't have multiple devices hanging | |
2135 | * off our complete list, and we're under the requested amount. | |
2136 | */ | |
2137 | spin = !ctx->poll_multi_file && *nr_events < min; | |
2138 | ||
2139 | ret = 0; | |
d21ffe7e | 2140 | list_for_each_entry_safe(req, tmp, &ctx->iopoll_list, inflight_entry) { |
9adbd45d | 2141 | struct kiocb *kiocb = &req->rw.kiocb; |
def596e9 JA |
2142 | |
2143 | /* | |
581f9810 BM |
2144 | * Move completed and retryable entries to our local lists. |
2145 | * If we find a request that requires polling, break out | |
2146 | * and complete those lists first, if we have entries there. | |
def596e9 | 2147 | */ |
65a6543d | 2148 | if (READ_ONCE(req->iopoll_completed)) { |
d21ffe7e | 2149 | list_move_tail(&req->inflight_entry, &done); |
def596e9 JA |
2150 | continue; |
2151 | } | |
2152 | if (!list_empty(&done)) | |
2153 | break; | |
2154 | ||
2155 | ret = kiocb->ki_filp->f_op->iopoll(kiocb, spin); | |
2156 | if (ret < 0) | |
2157 | break; | |
2158 | ||
3aadc23e PB |
2159 | /* iopoll may have completed current req */ |
2160 | if (READ_ONCE(req->iopoll_completed)) | |
d21ffe7e | 2161 | list_move_tail(&req->inflight_entry, &done); |
3aadc23e | 2162 | |
def596e9 JA |
2163 | if (ret && spin) |
2164 | spin = false; | |
2165 | ret = 0; | |
2166 | } | |
2167 | ||
2168 | if (!list_empty(&done)) | |
2169 | io_iopoll_complete(ctx, nr_events, &done); | |
2170 | ||
2171 | return ret; | |
2172 | } | |
2173 | ||
2174 | /* | |
d195a66e | 2175 | * Poll for a minimum of 'min' events. Note that if min == 0 we consider that a |
def596e9 JA |
2176 | * non-spinning poll check - we'll still enter the driver poll loop, but only |
2177 | * as a non-spinning completion check. | |
2178 | */ | |
2179 | static int io_iopoll_getevents(struct io_ring_ctx *ctx, unsigned int *nr_events, | |
2180 | long min) | |
2181 | { | |
540e32a0 | 2182 | while (!list_empty(&ctx->iopoll_list) && !need_resched()) { |
def596e9 JA |
2183 | int ret; |
2184 | ||
2185 | ret = io_do_iopoll(ctx, nr_events, min); | |
2186 | if (ret < 0) | |
2187 | return ret; | |
eba0a4dd | 2188 | if (*nr_events >= min) |
def596e9 JA |
2189 | return 0; |
2190 | } | |
2191 | ||
2192 | return 1; | |
2193 | } | |
2194 | ||
2195 | /* | |
2196 | * We can't just wait for polled events to come to us, we have to actively | |
2197 | * find and complete them. | |
2198 | */ | |
b2edc0a7 | 2199 | static void io_iopoll_try_reap_events(struct io_ring_ctx *ctx) |
def596e9 JA |
2200 | { |
2201 | if (!(ctx->flags & IORING_SETUP_IOPOLL)) | |
2202 | return; | |
2203 | ||
2204 | mutex_lock(&ctx->uring_lock); | |
540e32a0 | 2205 | while (!list_empty(&ctx->iopoll_list)) { |
def596e9 JA |
2206 | unsigned int nr_events = 0; |
2207 | ||
b2edc0a7 | 2208 | io_do_iopoll(ctx, &nr_events, 0); |
08f5439f | 2209 | |
b2edc0a7 PB |
2210 | /* let it sleep and repeat later if can't complete a request */ |
2211 | if (nr_events == 0) | |
2212 | break; | |
08f5439f JA |
2213 | /* |
2214 | * Ensure we allow local-to-the-cpu processing to take place, | |
2215 | * in this case we need to ensure that we reap all events. | |
3fcee5a6 | 2216 | * Also let task_work, etc. to progress by releasing the mutex |
08f5439f | 2217 | */ |
3fcee5a6 PB |
2218 | if (need_resched()) { |
2219 | mutex_unlock(&ctx->uring_lock); | |
2220 | cond_resched(); | |
2221 | mutex_lock(&ctx->uring_lock); | |
2222 | } | |
def596e9 JA |
2223 | } |
2224 | mutex_unlock(&ctx->uring_lock); | |
2225 | } | |
2226 | ||
7668b92a | 2227 | static int io_iopoll_check(struct io_ring_ctx *ctx, long min) |
def596e9 | 2228 | { |
7668b92a | 2229 | unsigned int nr_events = 0; |
2b2ed975 | 2230 | int iters = 0, ret = 0; |
500f9fba | 2231 | |
c7849be9 XW |
2232 | /* |
2233 | * We disallow the app entering submit/complete with polling, but we | |
2234 | * still need to lock the ring to prevent racing with polled issue | |
2235 | * that got punted to a workqueue. | |
2236 | */ | |
2237 | mutex_lock(&ctx->uring_lock); | |
def596e9 | 2238 | do { |
a3a0e43f JA |
2239 | /* |
2240 | * Don't enter poll loop if we already have events pending. | |
2241 | * If we do, we can potentially be spinning for commands that | |
2242 | * already triggered a CQE (eg in error). | |
2243 | */ | |
1d7bb1d5 | 2244 | if (io_cqring_events(ctx, false)) |
a3a0e43f JA |
2245 | break; |
2246 | ||
500f9fba JA |
2247 | /* |
2248 | * If a submit got punted to a workqueue, we can have the | |
2249 | * application entering polling for a command before it gets | |
2250 | * issued. That app will hold the uring_lock for the duration | |
2251 | * of the poll right here, so we need to take a breather every | |
2252 | * now and then to ensure that the issue has a chance to add | |
2253 | * the poll to the issued list. Otherwise we can spin here | |
2254 | * forever, while the workqueue is stuck trying to acquire the | |
2255 | * very same mutex. | |
2256 | */ | |
2257 | if (!(++iters & 7)) { | |
2258 | mutex_unlock(&ctx->uring_lock); | |
4c6e277c | 2259 | io_run_task_work(); |
500f9fba JA |
2260 | mutex_lock(&ctx->uring_lock); |
2261 | } | |
2262 | ||
7668b92a | 2263 | ret = io_iopoll_getevents(ctx, &nr_events, min); |
def596e9 JA |
2264 | if (ret <= 0) |
2265 | break; | |
2266 | ret = 0; | |
7668b92a | 2267 | } while (min && !nr_events && !need_resched()); |
def596e9 | 2268 | |
500f9fba | 2269 | mutex_unlock(&ctx->uring_lock); |
def596e9 JA |
2270 | return ret; |
2271 | } | |
2272 | ||
491381ce | 2273 | static void kiocb_end_write(struct io_kiocb *req) |
2b188cc1 | 2274 | { |
491381ce JA |
2275 | /* |
2276 | * Tell lockdep we inherited freeze protection from submission | |
2277 | * thread. | |
2278 | */ | |
2279 | if (req->flags & REQ_F_ISREG) { | |
2280 | struct inode *inode = file_inode(req->file); | |
2b188cc1 | 2281 | |
491381ce | 2282 | __sb_writers_acquired(inode->i_sb, SB_FREEZE_WRITE); |
2b188cc1 | 2283 | } |
491381ce | 2284 | file_end_write(req->file); |
2b188cc1 JA |
2285 | } |
2286 | ||
a1d7c393 JA |
2287 | static void io_complete_rw_common(struct kiocb *kiocb, long res, |
2288 | struct io_comp_state *cs) | |
2b188cc1 | 2289 | { |
9adbd45d | 2290 | struct io_kiocb *req = container_of(kiocb, struct io_kiocb, rw.kiocb); |
bcda7baa | 2291 | int cflags = 0; |
2b188cc1 | 2292 | |
491381ce JA |
2293 | if (kiocb->ki_flags & IOCB_WRITE) |
2294 | kiocb_end_write(req); | |
2b188cc1 | 2295 | |
4e88d6e7 JA |
2296 | if (res != req->result) |
2297 | req_set_fail_links(req); | |
bcda7baa | 2298 | if (req->flags & REQ_F_BUFFER_SELECTED) |
8ff069bf | 2299 | cflags = io_put_rw_kbuf(req); |
a1d7c393 | 2300 | __io_req_complete(req, res, cflags, cs); |
ba816ad6 JA |
2301 | } |
2302 | ||
b63534c4 JA |
2303 | #ifdef CONFIG_BLOCK |
2304 | static bool io_resubmit_prep(struct io_kiocb *req, int error) | |
2305 | { | |
2306 | struct iovec inline_vecs[UIO_FASTIOV], *iovec = inline_vecs; | |
2307 | ssize_t ret = -ECANCELED; | |
2308 | struct iov_iter iter; | |
2309 | int rw; | |
2310 | ||
2311 | if (error) { | |
2312 | ret = error; | |
2313 | goto end_req; | |
2314 | } | |
2315 | ||
2316 | switch (req->opcode) { | |
2317 | case IORING_OP_READV: | |
2318 | case IORING_OP_READ_FIXED: | |
2319 | case IORING_OP_READ: | |
2320 | rw = READ; | |
2321 | break; | |
2322 | case IORING_OP_WRITEV: | |
2323 | case IORING_OP_WRITE_FIXED: | |
2324 | case IORING_OP_WRITE: | |
2325 | rw = WRITE; | |
2326 | break; | |
2327 | default: | |
2328 | printk_once(KERN_WARNING "io_uring: bad opcode in resubmit %d\n", | |
2329 | req->opcode); | |
2330 | goto end_req; | |
2331 | } | |
2332 | ||
8f3d7496 JA |
2333 | if (!req->io) { |
2334 | ret = io_import_iovec(rw, req, &iovec, &iter, false); | |
2335 | if (ret < 0) | |
2336 | goto end_req; | |
2337 | ret = io_setup_async_rw(req, iovec, inline_vecs, &iter, false); | |
2338 | if (!ret) | |
2339 | return true; | |
2340 | kfree(iovec); | |
2341 | } else { | |
b63534c4 | 2342 | return true; |
8f3d7496 | 2343 | } |
b63534c4 | 2344 | end_req: |
b63534c4 | 2345 | req_set_fail_links(req); |
e1e16097 | 2346 | io_req_complete(req, ret); |
b63534c4 JA |
2347 | return false; |
2348 | } | |
b63534c4 JA |
2349 | #endif |
2350 | ||
2351 | static bool io_rw_reissue(struct io_kiocb *req, long res) | |
2352 | { | |
2353 | #ifdef CONFIG_BLOCK | |
355afaeb | 2354 | umode_t mode = file_inode(req->file)->i_mode; |
b63534c4 JA |
2355 | int ret; |
2356 | ||
355afaeb JA |
2357 | if (!S_ISBLK(mode) && !S_ISREG(mode)) |
2358 | return false; | |
b63534c4 JA |
2359 | if ((res != -EAGAIN && res != -EOPNOTSUPP) || io_wq_current_is_worker()) |
2360 | return false; | |
2361 | ||
fdee946d | 2362 | ret = io_sq_thread_acquire_mm(req->ctx, req); |
6d816e08 | 2363 | |
fdee946d JA |
2364 | if (io_resubmit_prep(req, ret)) { |
2365 | refcount_inc(&req->refs); | |
2366 | io_queue_async_work(req); | |
b63534c4 | 2367 | return true; |
fdee946d JA |
2368 | } |
2369 | ||
b63534c4 JA |
2370 | #endif |
2371 | return false; | |
2372 | } | |
2373 | ||
a1d7c393 JA |
2374 | static void __io_complete_rw(struct io_kiocb *req, long res, long res2, |
2375 | struct io_comp_state *cs) | |
2376 | { | |
2377 | if (!io_rw_reissue(req, res)) | |
2378 | io_complete_rw_common(&req->rw.kiocb, res, cs); | |
ba816ad6 JA |
2379 | } |
2380 | ||
2381 | static void io_complete_rw(struct kiocb *kiocb, long res, long res2) | |
2382 | { | |
9adbd45d | 2383 | struct io_kiocb *req = container_of(kiocb, struct io_kiocb, rw.kiocb); |
ba816ad6 | 2384 | |
a1d7c393 | 2385 | __io_complete_rw(req, res, res2, NULL); |
2b188cc1 JA |
2386 | } |
2387 | ||
def596e9 JA |
2388 | static void io_complete_rw_iopoll(struct kiocb *kiocb, long res, long res2) |
2389 | { | |
9adbd45d | 2390 | struct io_kiocb *req = container_of(kiocb, struct io_kiocb, rw.kiocb); |
def596e9 | 2391 | |
491381ce JA |
2392 | if (kiocb->ki_flags & IOCB_WRITE) |
2393 | kiocb_end_write(req); | |
def596e9 | 2394 | |
2d7d6792 | 2395 | if (res != -EAGAIN && res != req->result) |
4e88d6e7 | 2396 | req_set_fail_links(req); |
bbde017a XW |
2397 | |
2398 | WRITE_ONCE(req->result, res); | |
2399 | /* order with io_poll_complete() checking ->result */ | |
cd664b0e PB |
2400 | smp_wmb(); |
2401 | WRITE_ONCE(req->iopoll_completed, 1); | |
def596e9 JA |
2402 | } |
2403 | ||
2404 | /* | |
2405 | * After the iocb has been issued, it's safe to be found on the poll list. | |
2406 | * Adding the kiocb to the list AFTER submission ensures that we don't | |
2407 | * find it from a io_iopoll_getevents() thread before the issuer is done | |
2408 | * accessing the kiocb cookie. | |
2409 | */ | |
2410 | static void io_iopoll_req_issued(struct io_kiocb *req) | |
2411 | { | |
2412 | struct io_ring_ctx *ctx = req->ctx; | |
2413 | ||
2414 | /* | |
2415 | * Track whether we have multiple files in our lists. This will impact | |
2416 | * how we do polling eventually, not spinning if we're on potentially | |
2417 | * different devices. | |
2418 | */ | |
540e32a0 | 2419 | if (list_empty(&ctx->iopoll_list)) { |
def596e9 JA |
2420 | ctx->poll_multi_file = false; |
2421 | } else if (!ctx->poll_multi_file) { | |
2422 | struct io_kiocb *list_req; | |
2423 | ||
540e32a0 | 2424 | list_req = list_first_entry(&ctx->iopoll_list, struct io_kiocb, |
d21ffe7e | 2425 | inflight_entry); |
9adbd45d | 2426 | if (list_req->file != req->file) |
def596e9 JA |
2427 | ctx->poll_multi_file = true; |
2428 | } | |
2429 | ||
2430 | /* | |
2431 | * For fast devices, IO may have already completed. If it has, add | |
2432 | * it to the front so we find it first. | |
2433 | */ | |
65a6543d | 2434 | if (READ_ONCE(req->iopoll_completed)) |
d21ffe7e | 2435 | list_add(&req->inflight_entry, &ctx->iopoll_list); |
def596e9 | 2436 | else |
d21ffe7e | 2437 | list_add_tail(&req->inflight_entry, &ctx->iopoll_list); |
bdcd3eab XW |
2438 | |
2439 | if ((ctx->flags & IORING_SETUP_SQPOLL) && | |
2440 | wq_has_sleeper(&ctx->sqo_wait)) | |
2441 | wake_up(&ctx->sqo_wait); | |
def596e9 JA |
2442 | } |
2443 | ||
9f13c35b | 2444 | static void __io_state_file_put(struct io_submit_state *state) |
9a56a232 | 2445 | { |
06ef3608 PB |
2446 | if (state->has_refs) |
2447 | fput_many(state->file, state->has_refs); | |
9f13c35b PB |
2448 | state->file = NULL; |
2449 | } | |
2450 | ||
2451 | static inline void io_state_file_put(struct io_submit_state *state) | |
2452 | { | |
2453 | if (state->file) | |
2454 | __io_state_file_put(state); | |
9a56a232 JA |
2455 | } |
2456 | ||
2457 | /* | |
2458 | * Get as many references to a file as we have IOs left in this submission, | |
2459 | * assuming most submissions are for one file, or at least that each file | |
2460 | * has more than one submission. | |
2461 | */ | |
8da11c19 | 2462 | static struct file *__io_file_get(struct io_submit_state *state, int fd) |
9a56a232 JA |
2463 | { |
2464 | if (!state) | |
2465 | return fget(fd); | |
2466 | ||
2467 | if (state->file) { | |
2468 | if (state->fd == fd) { | |
06ef3608 | 2469 | state->has_refs--; |
9a56a232 JA |
2470 | state->ios_left--; |
2471 | return state->file; | |
2472 | } | |
9f13c35b | 2473 | __io_state_file_put(state); |
9a56a232 JA |
2474 | } |
2475 | state->file = fget_many(fd, state->ios_left); | |
2476 | if (!state->file) | |
2477 | return NULL; | |
2478 | ||
2479 | state->fd = fd; | |
9a56a232 | 2480 | state->ios_left--; |
06ef3608 | 2481 | state->has_refs = state->ios_left; |
9a56a232 JA |
2482 | return state->file; |
2483 | } | |
2484 | ||
4503b767 JA |
2485 | static bool io_bdev_nowait(struct block_device *bdev) |
2486 | { | |
2487 | #ifdef CONFIG_BLOCK | |
2488 | return !bdev || queue_is_mq(bdev_get_queue(bdev)); | |
2489 | #else | |
2490 | return true; | |
2491 | #endif | |
2492 | } | |
2493 | ||
2b188cc1 JA |
2494 | /* |
2495 | * If we tracked the file through the SCM inflight mechanism, we could support | |
2496 | * any file. For now, just ensure that anything potentially problematic is done | |
2497 | * inline. | |
2498 | */ | |
af197f50 | 2499 | static bool io_file_supports_async(struct file *file, int rw) |
2b188cc1 JA |
2500 | { |
2501 | umode_t mode = file_inode(file)->i_mode; | |
2502 | ||
4503b767 JA |
2503 | if (S_ISBLK(mode)) { |
2504 | if (io_bdev_nowait(file->f_inode->i_bdev)) | |
2505 | return true; | |
2506 | return false; | |
2507 | } | |
2508 | if (S_ISCHR(mode) || S_ISSOCK(mode)) | |
2b188cc1 | 2509 | return true; |
4503b767 JA |
2510 | if (S_ISREG(mode)) { |
2511 | if (io_bdev_nowait(file->f_inode->i_sb->s_bdev) && | |
2512 | file->f_op != &io_uring_fops) | |
2513 | return true; | |
2514 | return false; | |
2515 | } | |
2b188cc1 | 2516 | |
c5b85625 JA |
2517 | /* any ->read/write should understand O_NONBLOCK */ |
2518 | if (file->f_flags & O_NONBLOCK) | |
2519 | return true; | |
2520 | ||
af197f50 JA |
2521 | if (!(file->f_mode & FMODE_NOWAIT)) |
2522 | return false; | |
2523 | ||
2524 | if (rw == READ) | |
2525 | return file->f_op->read_iter != NULL; | |
2526 | ||
2527 | return file->f_op->write_iter != NULL; | |
2b188cc1 JA |
2528 | } |
2529 | ||
3529d8c2 JA |
2530 | static int io_prep_rw(struct io_kiocb *req, const struct io_uring_sqe *sqe, |
2531 | bool force_nonblock) | |
2b188cc1 | 2532 | { |
def596e9 | 2533 | struct io_ring_ctx *ctx = req->ctx; |
9adbd45d | 2534 | struct kiocb *kiocb = &req->rw.kiocb; |
09bb8394 JA |
2535 | unsigned ioprio; |
2536 | int ret; | |
2b188cc1 | 2537 | |
491381ce JA |
2538 | if (S_ISREG(file_inode(req->file)->i_mode)) |
2539 | req->flags |= REQ_F_ISREG; | |
2540 | ||
2b188cc1 | 2541 | kiocb->ki_pos = READ_ONCE(sqe->off); |
ba04291e JA |
2542 | if (kiocb->ki_pos == -1 && !(req->file->f_mode & FMODE_STREAM)) { |
2543 | req->flags |= REQ_F_CUR_POS; | |
2544 | kiocb->ki_pos = req->file->f_pos; | |
2545 | } | |
2b188cc1 | 2546 | kiocb->ki_hint = ki_hint_validate(file_write_hint(kiocb->ki_filp)); |
3e577dcd PB |
2547 | kiocb->ki_flags = iocb_flags(kiocb->ki_filp); |
2548 | ret = kiocb_set_rw_flags(kiocb, READ_ONCE(sqe->rw_flags)); | |
2549 | if (unlikely(ret)) | |
2550 | return ret; | |
2b188cc1 JA |
2551 | |
2552 | ioprio = READ_ONCE(sqe->ioprio); | |
2553 | if (ioprio) { | |
2554 | ret = ioprio_check_cap(ioprio); | |
2555 | if (ret) | |
09bb8394 | 2556 | return ret; |
2b188cc1 JA |
2557 | |
2558 | kiocb->ki_ioprio = ioprio; | |
2559 | } else | |
2560 | kiocb->ki_ioprio = get_current_ioprio(); | |
2561 | ||
8449eeda | 2562 | /* don't allow async punt if RWF_NOWAIT was requested */ |
c5b85625 | 2563 | if (kiocb->ki_flags & IOCB_NOWAIT) |
8449eeda SB |
2564 | req->flags |= REQ_F_NOWAIT; |
2565 | ||
2566 | if (force_nonblock) | |
2b188cc1 | 2567 | kiocb->ki_flags |= IOCB_NOWAIT; |
8449eeda | 2568 | |
def596e9 | 2569 | if (ctx->flags & IORING_SETUP_IOPOLL) { |
def596e9 JA |
2570 | if (!(kiocb->ki_flags & IOCB_DIRECT) || |
2571 | !kiocb->ki_filp->f_op->iopoll) | |
09bb8394 | 2572 | return -EOPNOTSUPP; |
2b188cc1 | 2573 | |
def596e9 JA |
2574 | kiocb->ki_flags |= IOCB_HIPRI; |
2575 | kiocb->ki_complete = io_complete_rw_iopoll; | |
65a6543d | 2576 | req->iopoll_completed = 0; |
def596e9 | 2577 | } else { |
09bb8394 JA |
2578 | if (kiocb->ki_flags & IOCB_HIPRI) |
2579 | return -EINVAL; | |
def596e9 JA |
2580 | kiocb->ki_complete = io_complete_rw; |
2581 | } | |
9adbd45d | 2582 | |
3529d8c2 JA |
2583 | req->rw.addr = READ_ONCE(sqe->addr); |
2584 | req->rw.len = READ_ONCE(sqe->len); | |
4f4eeba8 | 2585 | req->buf_index = READ_ONCE(sqe->buf_index); |
2b188cc1 | 2586 | return 0; |
2b188cc1 JA |
2587 | } |
2588 | ||
2589 | static inline void io_rw_done(struct kiocb *kiocb, ssize_t ret) | |
2590 | { | |
2591 | switch (ret) { | |
2592 | case -EIOCBQUEUED: | |
2593 | break; | |
2594 | case -ERESTARTSYS: | |
2595 | case -ERESTARTNOINTR: | |
2596 | case -ERESTARTNOHAND: | |
2597 | case -ERESTART_RESTARTBLOCK: | |
2598 | /* | |
2599 | * We can't just restart the syscall, since previously | |
2600 | * submitted sqes may already be in progress. Just fail this | |
2601 | * IO with EINTR. | |
2602 | */ | |
2603 | ret = -EINTR; | |
df561f66 | 2604 | fallthrough; |
2b188cc1 JA |
2605 | default: |
2606 | kiocb->ki_complete(kiocb, ret, 0); | |
2607 | } | |
2608 | } | |
2609 | ||
a1d7c393 JA |
2610 | static void kiocb_done(struct kiocb *kiocb, ssize_t ret, |
2611 | struct io_comp_state *cs) | |
ba816ad6 | 2612 | { |
ba04291e JA |
2613 | struct io_kiocb *req = container_of(kiocb, struct io_kiocb, rw.kiocb); |
2614 | ||
227c0c96 JA |
2615 | /* add previously done IO, if any */ |
2616 | if (req->io && req->io->rw.bytes_done > 0) { | |
2617 | if (ret < 0) | |
2618 | ret = req->io->rw.bytes_done; | |
2619 | else | |
2620 | ret += req->io->rw.bytes_done; | |
2621 | } | |
2622 | ||
ba04291e JA |
2623 | if (req->flags & REQ_F_CUR_POS) |
2624 | req->file->f_pos = kiocb->ki_pos; | |
bcaec089 | 2625 | if (ret >= 0 && kiocb->ki_complete == io_complete_rw) |
a1d7c393 | 2626 | __io_complete_rw(req, ret, 0, cs); |
ba816ad6 JA |
2627 | else |
2628 | io_rw_done(kiocb, ret); | |
2629 | } | |
2630 | ||
9adbd45d | 2631 | static ssize_t io_import_fixed(struct io_kiocb *req, int rw, |
7d009165 | 2632 | struct iov_iter *iter) |
edafccee | 2633 | { |
9adbd45d JA |
2634 | struct io_ring_ctx *ctx = req->ctx; |
2635 | size_t len = req->rw.len; | |
edafccee | 2636 | struct io_mapped_ubuf *imu; |
4f4eeba8 | 2637 | u16 index, buf_index; |
edafccee JA |
2638 | size_t offset; |
2639 | u64 buf_addr; | |
2640 | ||
2641 | /* attempt to use fixed buffers without having provided iovecs */ | |
2642 | if (unlikely(!ctx->user_bufs)) | |
2643 | return -EFAULT; | |
2644 | ||
4f4eeba8 | 2645 | buf_index = req->buf_index; |
edafccee JA |
2646 | if (unlikely(buf_index >= ctx->nr_user_bufs)) |
2647 | return -EFAULT; | |
2648 | ||
2649 | index = array_index_nospec(buf_index, ctx->nr_user_bufs); | |
2650 | imu = &ctx->user_bufs[index]; | |
9adbd45d | 2651 | buf_addr = req->rw.addr; |
edafccee JA |
2652 | |
2653 | /* overflow */ | |
2654 | if (buf_addr + len < buf_addr) | |
2655 | return -EFAULT; | |
2656 | /* not inside the mapped region */ | |
2657 | if (buf_addr < imu->ubuf || buf_addr + len > imu->ubuf + imu->len) | |
2658 | return -EFAULT; | |
2659 | ||
2660 | /* | |
2661 | * May not be a start of buffer, set size appropriately | |
2662 | * and advance us to the beginning. | |
2663 | */ | |
2664 | offset = buf_addr - imu->ubuf; | |
2665 | iov_iter_bvec(iter, rw, imu->bvec, imu->nr_bvecs, offset + len); | |
bd11b3a3 JA |
2666 | |
2667 | if (offset) { | |
2668 | /* | |
2669 | * Don't use iov_iter_advance() here, as it's really slow for | |
2670 | * using the latter parts of a big fixed buffer - it iterates | |
2671 | * over each segment manually. We can cheat a bit here, because | |
2672 | * we know that: | |
2673 | * | |
2674 | * 1) it's a BVEC iter, we set it up | |
2675 | * 2) all bvecs are PAGE_SIZE in size, except potentially the | |
2676 | * first and last bvec | |
2677 | * | |
2678 | * So just find our index, and adjust the iterator afterwards. | |
2679 | * If the offset is within the first bvec (or the whole first | |
2680 | * bvec, just use iov_iter_advance(). This makes it easier | |
2681 | * since we can just skip the first segment, which may not | |
2682 | * be PAGE_SIZE aligned. | |
2683 | */ | |
2684 | const struct bio_vec *bvec = imu->bvec; | |
2685 | ||
2686 | if (offset <= bvec->bv_len) { | |
2687 | iov_iter_advance(iter, offset); | |
2688 | } else { | |
2689 | unsigned long seg_skip; | |
2690 | ||
2691 | /* skip first vec */ | |
2692 | offset -= bvec->bv_len; | |
2693 | seg_skip = 1 + (offset >> PAGE_SHIFT); | |
2694 | ||
2695 | iter->bvec = bvec + seg_skip; | |
2696 | iter->nr_segs -= seg_skip; | |
99c79f66 | 2697 | iter->count -= bvec->bv_len + offset; |
bd11b3a3 | 2698 | iter->iov_offset = offset & ~PAGE_MASK; |
bd11b3a3 JA |
2699 | } |
2700 | } | |
2701 | ||
5e559561 | 2702 | return len; |
edafccee JA |
2703 | } |
2704 | ||
bcda7baa JA |
2705 | static void io_ring_submit_unlock(struct io_ring_ctx *ctx, bool needs_lock) |
2706 | { | |
2707 | if (needs_lock) | |
2708 | mutex_unlock(&ctx->uring_lock); | |
2709 | } | |
2710 | ||
2711 | static void io_ring_submit_lock(struct io_ring_ctx *ctx, bool needs_lock) | |
2712 | { | |
2713 | /* | |
2714 | * "Normal" inline submissions always hold the uring_lock, since we | |
2715 | * grab it from the system call. Same is true for the SQPOLL offload. | |
2716 | * The only exception is when we've detached the request and issue it | |
2717 | * from an async worker thread, grab the lock for that case. | |
2718 | */ | |
2719 | if (needs_lock) | |
2720 | mutex_lock(&ctx->uring_lock); | |
2721 | } | |
2722 | ||
2723 | static struct io_buffer *io_buffer_select(struct io_kiocb *req, size_t *len, | |
2724 | int bgid, struct io_buffer *kbuf, | |
2725 | bool needs_lock) | |
2726 | { | |
2727 | struct io_buffer *head; | |
2728 | ||
2729 | if (req->flags & REQ_F_BUFFER_SELECTED) | |
2730 | return kbuf; | |
2731 | ||
2732 | io_ring_submit_lock(req->ctx, needs_lock); | |
2733 | ||
2734 | lockdep_assert_held(&req->ctx->uring_lock); | |
2735 | ||
2736 | head = idr_find(&req->ctx->io_buffer_idr, bgid); | |
2737 | if (head) { | |
2738 | if (!list_empty(&head->list)) { | |
2739 | kbuf = list_last_entry(&head->list, struct io_buffer, | |
2740 | list); | |
2741 | list_del(&kbuf->list); | |
2742 | } else { | |
2743 | kbuf = head; | |
2744 | idr_remove(&req->ctx->io_buffer_idr, bgid); | |
2745 | } | |
2746 | if (*len > kbuf->len) | |
2747 | *len = kbuf->len; | |
2748 | } else { | |
2749 | kbuf = ERR_PTR(-ENOBUFS); | |
2750 | } | |
2751 | ||
2752 | io_ring_submit_unlock(req->ctx, needs_lock); | |
2753 | ||
2754 | return kbuf; | |
2755 | } | |
2756 | ||
4d954c25 JA |
2757 | static void __user *io_rw_buffer_select(struct io_kiocb *req, size_t *len, |
2758 | bool needs_lock) | |
2759 | { | |
2760 | struct io_buffer *kbuf; | |
4f4eeba8 | 2761 | u16 bgid; |
4d954c25 JA |
2762 | |
2763 | kbuf = (struct io_buffer *) (unsigned long) req->rw.addr; | |
4f4eeba8 | 2764 | bgid = req->buf_index; |
4d954c25 JA |
2765 | kbuf = io_buffer_select(req, len, bgid, kbuf, needs_lock); |
2766 | if (IS_ERR(kbuf)) | |
2767 | return kbuf; | |
2768 | req->rw.addr = (u64) (unsigned long) kbuf; | |
2769 | req->flags |= REQ_F_BUFFER_SELECTED; | |
2770 | return u64_to_user_ptr(kbuf->addr); | |
2771 | } | |
2772 | ||
2773 | #ifdef CONFIG_COMPAT | |
2774 | static ssize_t io_compat_import(struct io_kiocb *req, struct iovec *iov, | |
2775 | bool needs_lock) | |
2776 | { | |
2777 | struct compat_iovec __user *uiov; | |
2778 | compat_ssize_t clen; | |
2779 | void __user *buf; | |
2780 | ssize_t len; | |
2781 | ||
2782 | uiov = u64_to_user_ptr(req->rw.addr); | |
2783 | if (!access_ok(uiov, sizeof(*uiov))) | |
2784 | return -EFAULT; | |
2785 | if (__get_user(clen, &uiov->iov_len)) | |
2786 | return -EFAULT; | |
2787 | if (clen < 0) | |
2788 | return -EINVAL; | |
2789 | ||
2790 | len = clen; | |
2791 | buf = io_rw_buffer_select(req, &len, needs_lock); | |
2792 | if (IS_ERR(buf)) | |
2793 | return PTR_ERR(buf); | |
2794 | iov[0].iov_base = buf; | |
2795 | iov[0].iov_len = (compat_size_t) len; | |
2796 | return 0; | |
2797 | } | |
2798 | #endif | |
2799 | ||
2800 | static ssize_t __io_iov_buffer_select(struct io_kiocb *req, struct iovec *iov, | |
2801 | bool needs_lock) | |
2802 | { | |
2803 | struct iovec __user *uiov = u64_to_user_ptr(req->rw.addr); | |
2804 | void __user *buf; | |
2805 | ssize_t len; | |
2806 | ||
2807 | if (copy_from_user(iov, uiov, sizeof(*uiov))) | |
2808 | return -EFAULT; | |
2809 | ||
2810 | len = iov[0].iov_len; | |
2811 | if (len < 0) | |
2812 | return -EINVAL; | |
2813 | buf = io_rw_buffer_select(req, &len, needs_lock); | |
2814 | if (IS_ERR(buf)) | |
2815 | return PTR_ERR(buf); | |
2816 | iov[0].iov_base = buf; | |
2817 | iov[0].iov_len = len; | |
2818 | return 0; | |
2819 | } | |
2820 | ||
2821 | static ssize_t io_iov_buffer_select(struct io_kiocb *req, struct iovec *iov, | |
2822 | bool needs_lock) | |
2823 | { | |
dddb3e26 JA |
2824 | if (req->flags & REQ_F_BUFFER_SELECTED) { |
2825 | struct io_buffer *kbuf; | |
2826 | ||
2827 | kbuf = (struct io_buffer *) (unsigned long) req->rw.addr; | |
2828 | iov[0].iov_base = u64_to_user_ptr(kbuf->addr); | |
2829 | iov[0].iov_len = kbuf->len; | |
4d954c25 | 2830 | return 0; |
dddb3e26 | 2831 | } |
4d954c25 JA |
2832 | if (!req->rw.len) |
2833 | return 0; | |
2834 | else if (req->rw.len > 1) | |
2835 | return -EINVAL; | |
2836 | ||
2837 | #ifdef CONFIG_COMPAT | |
2838 | if (req->ctx->compat) | |
2839 | return io_compat_import(req, iov, needs_lock); | |
2840 | #endif | |
2841 | ||
2842 | return __io_iov_buffer_select(req, iov, needs_lock); | |
2843 | } | |
2844 | ||
8452fd0c JA |
2845 | static ssize_t __io_import_iovec(int rw, struct io_kiocb *req, |
2846 | struct iovec **iovec, struct iov_iter *iter, | |
2847 | bool needs_lock) | |
2b188cc1 | 2848 | { |
9adbd45d JA |
2849 | void __user *buf = u64_to_user_ptr(req->rw.addr); |
2850 | size_t sqe_len = req->rw.len; | |
4d954c25 | 2851 | ssize_t ret; |
edafccee JA |
2852 | u8 opcode; |
2853 | ||
d625c6ee | 2854 | opcode = req->opcode; |
7d009165 | 2855 | if (opcode == IORING_OP_READ_FIXED || opcode == IORING_OP_WRITE_FIXED) { |
edafccee | 2856 | *iovec = NULL; |
9adbd45d | 2857 | return io_import_fixed(req, rw, iter); |
edafccee | 2858 | } |
2b188cc1 | 2859 | |
bcda7baa | 2860 | /* buffer index only valid with fixed read/write, or buffer select */ |
4f4eeba8 | 2861 | if (req->buf_index && !(req->flags & REQ_F_BUFFER_SELECT)) |
9adbd45d JA |
2862 | return -EINVAL; |
2863 | ||
3a6820f2 | 2864 | if (opcode == IORING_OP_READ || opcode == IORING_OP_WRITE) { |
bcda7baa | 2865 | if (req->flags & REQ_F_BUFFER_SELECT) { |
4d954c25 | 2866 | buf = io_rw_buffer_select(req, &sqe_len, needs_lock); |
867a23ea | 2867 | if (IS_ERR(buf)) |
4d954c25 | 2868 | return PTR_ERR(buf); |
3f9d6441 | 2869 | req->rw.len = sqe_len; |
bcda7baa JA |
2870 | } |
2871 | ||
3a6820f2 JA |
2872 | ret = import_single_range(rw, buf, sqe_len, *iovec, iter); |
2873 | *iovec = NULL; | |
3a901598 | 2874 | return ret < 0 ? ret : sqe_len; |
3a6820f2 JA |
2875 | } |
2876 | ||
4d954c25 JA |
2877 | if (req->flags & REQ_F_BUFFER_SELECT) { |
2878 | ret = io_iov_buffer_select(req, *iovec, needs_lock); | |
3f9d6441 JA |
2879 | if (!ret) { |
2880 | ret = (*iovec)->iov_len; | |
2881 | iov_iter_init(iter, rw, *iovec, 1, ret); | |
2882 | } | |
4d954c25 JA |
2883 | *iovec = NULL; |
2884 | return ret; | |
2885 | } | |
2886 | ||
2b188cc1 | 2887 | #ifdef CONFIG_COMPAT |
cf6fd4bd | 2888 | if (req->ctx->compat) |
2b188cc1 JA |
2889 | return compat_import_iovec(rw, buf, sqe_len, UIO_FASTIOV, |
2890 | iovec, iter); | |
2891 | #endif | |
2892 | ||
2893 | return import_iovec(rw, buf, sqe_len, UIO_FASTIOV, iovec, iter); | |
2894 | } | |
2895 | ||
8452fd0c JA |
2896 | static ssize_t io_import_iovec(int rw, struct io_kiocb *req, |
2897 | struct iovec **iovec, struct iov_iter *iter, | |
2898 | bool needs_lock) | |
2899 | { | |
2900 | if (!req->io) | |
2901 | return __io_import_iovec(rw, req, iovec, iter, needs_lock); | |
2902 | *iovec = NULL; | |
2903 | return iov_iter_count(&req->io->rw.iter); | |
2904 | } | |
2905 | ||
0fef9483 JA |
2906 | static inline loff_t *io_kiocb_ppos(struct kiocb *kiocb) |
2907 | { | |
2908 | return kiocb->ki_filp->f_mode & FMODE_STREAM ? NULL : &kiocb->ki_pos; | |
2909 | } | |
2910 | ||
31b51510 | 2911 | /* |
32960613 JA |
2912 | * For files that don't have ->read_iter() and ->write_iter(), handle them |
2913 | * by looping over ->read() or ->write() manually. | |
31b51510 | 2914 | */ |
32960613 JA |
2915 | static ssize_t loop_rw_iter(int rw, struct file *file, struct kiocb *kiocb, |
2916 | struct iov_iter *iter) | |
2917 | { | |
2918 | ssize_t ret = 0; | |
2919 | ||
2920 | /* | |
2921 | * Don't support polled IO through this interface, and we can't | |
2922 | * support non-blocking either. For the latter, this just causes | |
2923 | * the kiocb to be handled from an async context. | |
2924 | */ | |
2925 | if (kiocb->ki_flags & IOCB_HIPRI) | |
2926 | return -EOPNOTSUPP; | |
2927 | if (kiocb->ki_flags & IOCB_NOWAIT) | |
2928 | return -EAGAIN; | |
2929 | ||
2930 | while (iov_iter_count(iter)) { | |
311ae9e1 | 2931 | struct iovec iovec; |
32960613 JA |
2932 | ssize_t nr; |
2933 | ||
311ae9e1 PB |
2934 | if (!iov_iter_is_bvec(iter)) { |
2935 | iovec = iov_iter_iovec(iter); | |
2936 | } else { | |
2937 | /* fixed buffers import bvec */ | |
2938 | iovec.iov_base = kmap(iter->bvec->bv_page) | |
2939 | + iter->iov_offset; | |
2940 | iovec.iov_len = min(iter->count, | |
2941 | iter->bvec->bv_len - iter->iov_offset); | |
2942 | } | |
2943 | ||
32960613 JA |
2944 | if (rw == READ) { |
2945 | nr = file->f_op->read(file, iovec.iov_base, | |
0fef9483 | 2946 | iovec.iov_len, io_kiocb_ppos(kiocb)); |
32960613 JA |
2947 | } else { |
2948 | nr = file->f_op->write(file, iovec.iov_base, | |
0fef9483 | 2949 | iovec.iov_len, io_kiocb_ppos(kiocb)); |
32960613 JA |
2950 | } |
2951 | ||
311ae9e1 PB |
2952 | if (iov_iter_is_bvec(iter)) |
2953 | kunmap(iter->bvec->bv_page); | |
2954 | ||
32960613 JA |
2955 | if (nr < 0) { |
2956 | if (!ret) | |
2957 | ret = nr; | |
2958 | break; | |
2959 | } | |
2960 | ret += nr; | |
2961 | if (nr != iovec.iov_len) | |
2962 | break; | |
2963 | iov_iter_advance(iter, nr); | |
2964 | } | |
2965 | ||
2966 | return ret; | |
2967 | } | |
2968 | ||
ff6165b2 JA |
2969 | static void io_req_map_rw(struct io_kiocb *req, const struct iovec *iovec, |
2970 | const struct iovec *fast_iov, struct iov_iter *iter) | |
f67676d1 | 2971 | { |
b64e3444 PB |
2972 | struct io_async_rw *rw = &req->io->rw; |
2973 | ||
ff6165b2 JA |
2974 | memcpy(&rw->iter, iter, sizeof(*iter)); |
2975 | rw->free_iovec = NULL; | |
227c0c96 | 2976 | rw->bytes_done = 0; |
ff6165b2 JA |
2977 | /* can only be fixed buffers, no need to do anything */ |
2978 | if (iter->type == ITER_BVEC) | |
2979 | return; | |
b64e3444 | 2980 | if (!iovec) { |
ff6165b2 JA |
2981 | unsigned iov_off = 0; |
2982 | ||
2983 | rw->iter.iov = rw->fast_iov; | |
2984 | if (iter->iov != fast_iov) { | |
2985 | iov_off = iter->iov - fast_iov; | |
2986 | rw->iter.iov += iov_off; | |
2987 | } | |
2988 | if (rw->fast_iov != fast_iov) | |
2989 | memcpy(rw->fast_iov + iov_off, fast_iov + iov_off, | |
45097dae | 2990 | sizeof(struct iovec) * iter->nr_segs); |
99bc4c38 | 2991 | } else { |
ff6165b2 | 2992 | rw->free_iovec = iovec; |
99bc4c38 | 2993 | req->flags |= REQ_F_NEED_CLEANUP; |
f67676d1 JA |
2994 | } |
2995 | } | |
2996 | ||
3d9932a8 XW |
2997 | static inline int __io_alloc_async_ctx(struct io_kiocb *req) |
2998 | { | |
2999 | req->io = kmalloc(sizeof(*req->io), GFP_KERNEL); | |
3000 | return req->io == NULL; | |
3001 | } | |
3002 | ||
b7bb4f7d | 3003 | static int io_alloc_async_ctx(struct io_kiocb *req) |
f67676d1 | 3004 | { |
d3656344 JA |
3005 | if (!io_op_defs[req->opcode].async_ctx) |
3006 | return 0; | |
3d9932a8 XW |
3007 | |
3008 | return __io_alloc_async_ctx(req); | |
b7bb4f7d JA |
3009 | } |
3010 | ||
ff6165b2 JA |
3011 | static int io_setup_async_rw(struct io_kiocb *req, const struct iovec *iovec, |
3012 | const struct iovec *fast_iov, | |
227c0c96 | 3013 | struct iov_iter *iter, bool force) |
b7bb4f7d | 3014 | { |
227c0c96 | 3015 | if (!force && !io_op_defs[req->opcode].async_ctx) |
74566df3 | 3016 | return 0; |
5d204bcf | 3017 | if (!req->io) { |
3d9932a8 | 3018 | if (__io_alloc_async_ctx(req)) |
5d204bcf | 3019 | return -ENOMEM; |
b7bb4f7d | 3020 | |
ff6165b2 | 3021 | io_req_map_rw(req, iovec, fast_iov, iter); |
5d204bcf | 3022 | } |
b7bb4f7d | 3023 | return 0; |
f67676d1 JA |
3024 | } |
3025 | ||
c3e330a4 PB |
3026 | static inline int io_rw_prep_async(struct io_kiocb *req, int rw, |
3027 | bool force_nonblock) | |
3028 | { | |
ff6165b2 | 3029 | struct io_async_rw *iorw = &req->io->rw; |
c183edff | 3030 | struct iovec *iov; |
c3e330a4 PB |
3031 | ssize_t ret; |
3032 | ||
c183edff JA |
3033 | iorw->iter.iov = iov = iorw->fast_iov; |
3034 | ret = __io_import_iovec(rw, req, &iov, &iorw->iter, !force_nonblock); | |
c3e330a4 PB |
3035 | if (unlikely(ret < 0)) |
3036 | return ret; | |
3037 | ||
c183edff | 3038 | iorw->iter.iov = iov; |
ff6165b2 | 3039 | io_req_map_rw(req, iorw->iter.iov, iorw->fast_iov, &iorw->iter); |
c3e330a4 PB |
3040 | return 0; |
3041 | } | |
3042 | ||
3529d8c2 JA |
3043 | static int io_read_prep(struct io_kiocb *req, const struct io_uring_sqe *sqe, |
3044 | bool force_nonblock) | |
f67676d1 JA |
3045 | { |
3046 | ssize_t ret; | |
3047 | ||
3529d8c2 JA |
3048 | ret = io_prep_rw(req, sqe, force_nonblock); |
3049 | if (ret) | |
3050 | return ret; | |
f67676d1 | 3051 | |
3529d8c2 JA |
3052 | if (unlikely(!(req->file->f_mode & FMODE_READ))) |
3053 | return -EBADF; | |
f67676d1 | 3054 | |
5f798bea PB |
3055 | /* either don't need iovec imported or already have it */ |
3056 | if (!req->io || req->flags & REQ_F_NEED_CLEANUP) | |
3529d8c2 | 3057 | return 0; |
c3e330a4 | 3058 | return io_rw_prep_async(req, READ, force_nonblock); |
f67676d1 JA |
3059 | } |
3060 | ||
c1dd91d1 JA |
3061 | /* |
3062 | * This is our waitqueue callback handler, registered through lock_page_async() | |
3063 | * when we initially tried to do the IO with the iocb armed our waitqueue. | |
3064 | * This gets called when the page is unlocked, and we generally expect that to | |
3065 | * happen when the page IO is completed and the page is now uptodate. This will | |
3066 | * queue a task_work based retry of the operation, attempting to copy the data | |
3067 | * again. If the latter fails because the page was NOT uptodate, then we will | |
3068 | * do a thread based blocking retry of the operation. That's the unexpected | |
3069 | * slow path. | |
3070 | */ | |
bcf5a063 JA |
3071 | static int io_async_buf_func(struct wait_queue_entry *wait, unsigned mode, |
3072 | int sync, void *arg) | |
3073 | { | |
3074 | struct wait_page_queue *wpq; | |
3075 | struct io_kiocb *req = wait->private; | |
bcf5a063 | 3076 | struct wait_page_key *key = arg; |
bcf5a063 JA |
3077 | int ret; |
3078 | ||
3079 | wpq = container_of(wait, struct wait_page_queue, wait); | |
3080 | ||
cdc8fcb4 LT |
3081 | if (!wake_page_match(wpq, key)) |
3082 | return 0; | |
3083 | ||
c8d317aa | 3084 | req->rw.kiocb.ki_flags &= ~IOCB_WAITQ; |
bcf5a063 JA |
3085 | list_del_init(&wait->entry); |
3086 | ||
e7375122 | 3087 | init_task_work(&req->task_work, io_req_task_submit); |
6d816e08 JA |
3088 | percpu_ref_get(&req->ctx->refs); |
3089 | ||
bcf5a063 JA |
3090 | /* submit ref gets dropped, acquire a new one */ |
3091 | refcount_inc(&req->refs); | |
fd7d6de2 | 3092 | ret = io_req_task_work_add(req, &req->task_work, true); |
bcf5a063 | 3093 | if (unlikely(ret)) { |
c2c4c83c JA |
3094 | struct task_struct *tsk; |
3095 | ||
bcf5a063 | 3096 | /* queue just for cancelation */ |
e7375122 | 3097 | init_task_work(&req->task_work, io_req_task_cancel); |
bcf5a063 | 3098 | tsk = io_wq_get_task(req->ctx->io_wq); |
e7375122 | 3099 | task_work_add(tsk, &req->task_work, 0); |
c2c4c83c | 3100 | wake_up_process(tsk); |
bcf5a063 | 3101 | } |
bcf5a063 JA |
3102 | return 1; |
3103 | } | |
3104 | ||
c1dd91d1 JA |
3105 | /* |
3106 | * This controls whether a given IO request should be armed for async page | |
3107 | * based retry. If we return false here, the request is handed to the async | |
3108 | * worker threads for retry. If we're doing buffered reads on a regular file, | |
3109 | * we prepare a private wait_page_queue entry and retry the operation. This | |
3110 | * will either succeed because the page is now uptodate and unlocked, or it | |
3111 | * will register a callback when the page is unlocked at IO completion. Through | |
3112 | * that callback, io_uring uses task_work to setup a retry of the operation. | |
3113 | * That retry will attempt the buffered read again. The retry will generally | |
3114 | * succeed, or in rare cases where it fails, we then fall back to using the | |
3115 | * async worker threads for a blocking retry. | |
3116 | */ | |
227c0c96 | 3117 | static bool io_rw_should_retry(struct io_kiocb *req) |
f67676d1 | 3118 | { |
3b2a4439 | 3119 | struct wait_page_queue *wait = &req->io->rw.wpq; |
bcf5a063 | 3120 | struct kiocb *kiocb = &req->rw.kiocb; |
f67676d1 | 3121 | |
bcf5a063 JA |
3122 | /* never retry for NOWAIT, we just complete with -EAGAIN */ |
3123 | if (req->flags & REQ_F_NOWAIT) | |
3124 | return false; | |
f67676d1 | 3125 | |
227c0c96 | 3126 | /* Only for buffered IO */ |
3b2a4439 | 3127 | if (kiocb->ki_flags & (IOCB_DIRECT | IOCB_HIPRI)) |
bcf5a063 | 3128 | return false; |
3b2a4439 | 3129 | |
bcf5a063 JA |
3130 | /* |
3131 | * just use poll if we can, and don't attempt if the fs doesn't | |
3132 | * support callback based unlocks | |
3133 | */ | |
3134 | if (file_can_poll(req->file) || !(req->file->f_mode & FMODE_BUF_RASYNC)) | |
3135 | return false; | |
f67676d1 | 3136 | |
3b2a4439 JA |
3137 | wait->wait.func = io_async_buf_func; |
3138 | wait->wait.private = req; | |
3139 | wait->wait.flags = 0; | |
3140 | INIT_LIST_HEAD(&wait->wait.entry); | |
3141 | kiocb->ki_flags |= IOCB_WAITQ; | |
c8d317aa | 3142 | kiocb->ki_flags &= ~IOCB_NOWAIT; |
3b2a4439 | 3143 | kiocb->ki_waitq = wait; |
3b2a4439 | 3144 | return true; |
bcf5a063 JA |
3145 | } |
3146 | ||
3147 | static int io_iter_do_read(struct io_kiocb *req, struct iov_iter *iter) | |
3148 | { | |
3149 | if (req->file->f_op->read_iter) | |
3150 | return call_read_iter(req->file, &req->rw.kiocb, iter); | |
2dd2111d GH |
3151 | else if (req->file->f_op->read) |
3152 | return loop_rw_iter(READ, req->file, &req->rw.kiocb, iter); | |
3153 | else | |
3154 | return -EINVAL; | |
f67676d1 JA |
3155 | } |
3156 | ||
a1d7c393 JA |
3157 | static int io_read(struct io_kiocb *req, bool force_nonblock, |
3158 | struct io_comp_state *cs) | |
2b188cc1 JA |
3159 | { |
3160 | struct iovec inline_vecs[UIO_FASTIOV], *iovec = inline_vecs; | |
9adbd45d | 3161 | struct kiocb *kiocb = &req->rw.kiocb; |
ff6165b2 | 3162 | struct iov_iter __iter, *iter = &__iter; |
227c0c96 | 3163 | ssize_t io_size, ret, ret2; |
31b51510 | 3164 | size_t iov_count; |
f5cac8b1 | 3165 | bool no_async; |
ff6165b2 JA |
3166 | |
3167 | if (req->io) | |
3168 | iter = &req->io->rw.iter; | |
2b188cc1 | 3169 | |
ff6165b2 | 3170 | ret = io_import_iovec(READ, req, &iovec, iter, !force_nonblock); |
06b76d44 JA |
3171 | if (ret < 0) |
3172 | return ret; | |
eefdf30f | 3173 | iov_count = iov_iter_count(iter); |
fa15bafb PB |
3174 | io_size = ret; |
3175 | req->result = io_size; | |
227c0c96 | 3176 | ret = 0; |
2b188cc1 | 3177 | |
fd6c2e4c JA |
3178 | /* Ensure we clear previously set non-block flag */ |
3179 | if (!force_nonblock) | |
29de5f6a | 3180 | kiocb->ki_flags &= ~IOCB_NOWAIT; |
fd6c2e4c | 3181 | |
24c74678 | 3182 | /* If the file doesn't support async, just async punt */ |
f5cac8b1 JA |
3183 | no_async = force_nonblock && !io_file_supports_async(req->file, READ); |
3184 | if (no_async) | |
f67676d1 | 3185 | goto copy_iov; |
9e645e11 | 3186 | |
0fef9483 | 3187 | ret = rw_verify_area(READ, req->file, io_kiocb_ppos(kiocb), iov_count); |
fa15bafb PB |
3188 | if (unlikely(ret)) |
3189 | goto out_free; | |
2b188cc1 | 3190 | |
227c0c96 | 3191 | ret = io_iter_do_read(req, iter); |
32960613 | 3192 | |
227c0c96 JA |
3193 | if (!ret) { |
3194 | goto done; | |
3195 | } else if (ret == -EIOCBQUEUED) { | |
3196 | ret = 0; | |
3197 | goto out_free; | |
3198 | } else if (ret == -EAGAIN) { | |
eefdf30f JA |
3199 | /* IOPOLL retry should happen for io-wq threads */ |
3200 | if (!force_nonblock && !(req->ctx->flags & IORING_SETUP_IOPOLL)) | |
f91daf56 | 3201 | goto done; |
355afaeb JA |
3202 | /* no retry on NONBLOCK marked file */ |
3203 | if (req->file->f_flags & O_NONBLOCK) | |
3204 | goto done; | |
84216315 JA |
3205 | /* some cases will consume bytes even on error returns */ |
3206 | iov_iter_revert(iter, iov_count - iov_iter_count(iter)); | |
f38c7e3a JA |
3207 | ret = 0; |
3208 | goto copy_iov; | |
227c0c96 | 3209 | } else if (ret < 0) { |
00d23d51 JA |
3210 | /* make sure -ERESTARTSYS -> -EINTR is done */ |
3211 | goto done; | |
227c0c96 JA |
3212 | } |
3213 | ||
3214 | /* read it all, or we did blocking attempt. no retry. */ | |
f91daf56 JA |
3215 | if (!iov_iter_count(iter) || !force_nonblock || |
3216 | (req->file->f_flags & O_NONBLOCK)) | |
227c0c96 JA |
3217 | goto done; |
3218 | ||
3219 | io_size -= ret; | |
3220 | copy_iov: | |
3221 | ret2 = io_setup_async_rw(req, iovec, inline_vecs, iter, true); | |
3222 | if (ret2) { | |
3223 | ret = ret2; | |
3224 | goto out_free; | |
3225 | } | |
f5cac8b1 JA |
3226 | if (no_async) |
3227 | return -EAGAIN; | |
227c0c96 JA |
3228 | /* it's copied and will be cleaned with ->io */ |
3229 | iovec = NULL; | |
3230 | /* now use our persistent iterator, if we aren't already */ | |
3231 | iter = &req->io->rw.iter; | |
3232 | retry: | |
3233 | req->io->rw.bytes_done += ret; | |
3234 | /* if we can retry, do so with the callbacks armed */ | |
3235 | if (!io_rw_should_retry(req)) { | |
fa15bafb PB |
3236 | kiocb->ki_flags &= ~IOCB_WAITQ; |
3237 | return -EAGAIN; | |
2b188cc1 | 3238 | } |
227c0c96 JA |
3239 | |
3240 | /* | |
3241 | * Now retry read with the IOCB_WAITQ parts set in the iocb. If we | |
3242 | * get -EIOCBQUEUED, then we'll get a notification when the desired | |
3243 | * page gets unlocked. We can also get a partial read here, and if we | |
3244 | * do, then just retry at the new offset. | |
3245 | */ | |
3246 | ret = io_iter_do_read(req, iter); | |
3247 | if (ret == -EIOCBQUEUED) { | |
3248 | ret = 0; | |
3249 | goto out_free; | |
3250 | } else if (ret > 0 && ret < io_size) { | |
3251 | /* we got some bytes, but not all. retry. */ | |
3252 | goto retry; | |
3253 | } | |
3254 | done: | |
3255 | kiocb_done(kiocb, ret, cs); | |
3256 | ret = 0; | |
f67676d1 | 3257 | out_free: |
f261c168 | 3258 | /* it's reportedly faster than delegating the null check to kfree() */ |
252917c3 | 3259 | if (iovec) |
6f2cc166 | 3260 | kfree(iovec); |
2b188cc1 JA |
3261 | return ret; |
3262 | } | |
3263 | ||
3529d8c2 JA |
3264 | static int io_write_prep(struct io_kiocb *req, const struct io_uring_sqe *sqe, |
3265 | bool force_nonblock) | |
f67676d1 JA |
3266 | { |
3267 | ssize_t ret; | |
3268 | ||
3529d8c2 JA |
3269 | ret = io_prep_rw(req, sqe, force_nonblock); |
3270 | if (ret) | |
3271 | return ret; | |
f67676d1 | 3272 | |
3529d8c2 JA |
3273 | if (unlikely(!(req->file->f_mode & FMODE_WRITE))) |
3274 | return -EBADF; | |
f67676d1 | 3275 | |
5f798bea PB |
3276 | /* either don't need iovec imported or already have it */ |
3277 | if (!req->io || req->flags & REQ_F_NEED_CLEANUP) | |
3529d8c2 | 3278 | return 0; |
c3e330a4 | 3279 | return io_rw_prep_async(req, WRITE, force_nonblock); |
f67676d1 JA |
3280 | } |
3281 | ||
a1d7c393 JA |
3282 | static int io_write(struct io_kiocb *req, bool force_nonblock, |
3283 | struct io_comp_state *cs) | |
2b188cc1 JA |
3284 | { |
3285 | struct iovec inline_vecs[UIO_FASTIOV], *iovec = inline_vecs; | |
9adbd45d | 3286 | struct kiocb *kiocb = &req->rw.kiocb; |
ff6165b2 | 3287 | struct iov_iter __iter, *iter = &__iter; |
31b51510 | 3288 | size_t iov_count; |
fa15bafb | 3289 | ssize_t ret, ret2, io_size; |
2b188cc1 | 3290 | |
ff6165b2 JA |
3291 | if (req->io) |
3292 | iter = &req->io->rw.iter; | |
3293 | ||
3294 | ret = io_import_iovec(WRITE, req, &iovec, iter, !force_nonblock); | |
06b76d44 JA |
3295 | if (ret < 0) |
3296 | return ret; | |
eefdf30f | 3297 | iov_count = iov_iter_count(iter); |
fa15bafb PB |
3298 | io_size = ret; |
3299 | req->result = io_size; | |
2b188cc1 | 3300 | |
fd6c2e4c JA |
3301 | /* Ensure we clear previously set non-block flag */ |
3302 | if (!force_nonblock) | |
9adbd45d | 3303 | req->rw.kiocb.ki_flags &= ~IOCB_NOWAIT; |
fd6c2e4c | 3304 | |
24c74678 | 3305 | /* If the file doesn't support async, just async punt */ |
af197f50 | 3306 | if (force_nonblock && !io_file_supports_async(req->file, WRITE)) |
f67676d1 | 3307 | goto copy_iov; |
31b51510 | 3308 | |
10d59345 JA |
3309 | /* file path doesn't support NOWAIT for non-direct_IO */ |
3310 | if (force_nonblock && !(kiocb->ki_flags & IOCB_DIRECT) && | |
3311 | (req->flags & REQ_F_ISREG)) | |
f67676d1 | 3312 | goto copy_iov; |
31b51510 | 3313 | |
0fef9483 | 3314 | ret = rw_verify_area(WRITE, req->file, io_kiocb_ppos(kiocb), iov_count); |
fa15bafb PB |
3315 | if (unlikely(ret)) |
3316 | goto out_free; | |
4ed734b0 | 3317 | |
fa15bafb PB |
3318 | /* |
3319 | * Open-code file_start_write here to grab freeze protection, | |
3320 | * which will be released by another thread in | |
3321 | * io_complete_rw(). Fool lockdep by telling it the lock got | |
3322 | * released so that it doesn't complain about the held lock when | |
3323 | * we return to userspace. | |
3324 | */ | |
3325 | if (req->flags & REQ_F_ISREG) { | |
3326 | __sb_start_write(file_inode(req->file)->i_sb, | |
3327 | SB_FREEZE_WRITE, true); | |
3328 | __sb_writers_release(file_inode(req->file)->i_sb, | |
3329 | SB_FREEZE_WRITE); | |
3330 | } | |
3331 | kiocb->ki_flags |= IOCB_WRITE; | |
4ed734b0 | 3332 | |
fa15bafb | 3333 | if (req->file->f_op->write_iter) |
ff6165b2 | 3334 | ret2 = call_write_iter(req->file, kiocb, iter); |
2dd2111d | 3335 | else if (req->file->f_op->write) |
ff6165b2 | 3336 | ret2 = loop_rw_iter(WRITE, req->file, kiocb, iter); |
2dd2111d GH |
3337 | else |
3338 | ret2 = -EINVAL; | |
4ed734b0 | 3339 | |
fa15bafb PB |
3340 | /* |
3341 | * Raw bdev writes will return -EOPNOTSUPP for IOCB_NOWAIT. Just | |
3342 | * retry them without IOCB_NOWAIT. | |
3343 | */ | |
3344 | if (ret2 == -EOPNOTSUPP && (kiocb->ki_flags & IOCB_NOWAIT)) | |
3345 | ret2 = -EAGAIN; | |
355afaeb JA |
3346 | /* no retry on NONBLOCK marked file */ |
3347 | if (ret2 == -EAGAIN && (req->file->f_flags & O_NONBLOCK)) | |
3348 | goto done; | |
fa15bafb | 3349 | if (!force_nonblock || ret2 != -EAGAIN) { |
eefdf30f JA |
3350 | /* IOPOLL retry should happen for io-wq threads */ |
3351 | if ((req->ctx->flags & IORING_SETUP_IOPOLL) && ret2 == -EAGAIN) | |
3352 | goto copy_iov; | |
355afaeb | 3353 | done: |
fa15bafb PB |
3354 | kiocb_done(kiocb, ret2, cs); |
3355 | } else { | |
f67676d1 | 3356 | copy_iov: |
84216315 JA |
3357 | /* some cases will consume bytes even on error returns */ |
3358 | iov_iter_revert(iter, iov_count - iov_iter_count(iter)); | |
227c0c96 | 3359 | ret = io_setup_async_rw(req, iovec, inline_vecs, iter, false); |
ff6165b2 JA |
3360 | if (!ret) |
3361 | return -EAGAIN; | |
2b188cc1 | 3362 | } |
31b51510 | 3363 | out_free: |
f261c168 | 3364 | /* it's reportedly faster than delegating the null check to kfree() */ |
252917c3 | 3365 | if (iovec) |
6f2cc166 | 3366 | kfree(iovec); |
2b188cc1 JA |
3367 | return ret; |
3368 | } | |
3369 | ||
f2a8d5c7 PB |
3370 | static int __io_splice_prep(struct io_kiocb *req, |
3371 | const struct io_uring_sqe *sqe) | |
7d67af2c PB |
3372 | { |
3373 | struct io_splice* sp = &req->splice; | |
3374 | unsigned int valid_flags = SPLICE_F_FD_IN_FIXED | SPLICE_F_ALL; | |
3375 | int ret; | |
3376 | ||
3377 | if (req->flags & REQ_F_NEED_CLEANUP) | |
3378 | return 0; | |
3232dd02 PB |
3379 | if (unlikely(req->ctx->flags & IORING_SETUP_IOPOLL)) |
3380 | return -EINVAL; | |
7d67af2c PB |
3381 | |
3382 | sp->file_in = NULL; | |
7d67af2c PB |
3383 | sp->len = READ_ONCE(sqe->len); |
3384 | sp->flags = READ_ONCE(sqe->splice_flags); | |
3385 | ||
3386 | if (unlikely(sp->flags & ~valid_flags)) | |
3387 | return -EINVAL; | |
3388 | ||
3389 | ret = io_file_get(NULL, req, READ_ONCE(sqe->splice_fd_in), &sp->file_in, | |
3390 | (sp->flags & SPLICE_F_FD_IN_FIXED)); | |
3391 | if (ret) | |
3392 | return ret; | |
3393 | req->flags |= REQ_F_NEED_CLEANUP; | |
3394 | ||
7cdaf587 XW |
3395 | if (!S_ISREG(file_inode(sp->file_in)->i_mode)) { |
3396 | /* | |
3397 | * Splice operation will be punted aync, and here need to | |
3398 | * modify io_wq_work.flags, so initialize io_wq_work firstly. | |
3399 | */ | |
3400 | io_req_init_async(req); | |
7d67af2c | 3401 | req->work.flags |= IO_WQ_WORK_UNBOUND; |
7cdaf587 | 3402 | } |
7d67af2c PB |
3403 | |
3404 | return 0; | |
3405 | } | |
3406 | ||
f2a8d5c7 PB |
3407 | static int io_tee_prep(struct io_kiocb *req, |
3408 | const struct io_uring_sqe *sqe) | |
3409 | { | |
3410 | if (READ_ONCE(sqe->splice_off_in) || READ_ONCE(sqe->off)) | |
3411 | return -EINVAL; | |
3412 | return __io_splice_prep(req, sqe); | |
3413 | } | |
3414 | ||
3415 | static int io_tee(struct io_kiocb *req, bool force_nonblock) | |
3416 | { | |
3417 | struct io_splice *sp = &req->splice; | |
3418 | struct file *in = sp->file_in; | |
3419 | struct file *out = sp->file_out; | |
3420 | unsigned int flags = sp->flags & ~SPLICE_F_FD_IN_FIXED; | |
3421 | long ret = 0; | |
3422 | ||
3423 | if (force_nonblock) | |
3424 | return -EAGAIN; | |
3425 | if (sp->len) | |
3426 | ret = do_tee(in, out, sp->len, flags); | |
3427 | ||
3428 | io_put_file(req, in, (sp->flags & SPLICE_F_FD_IN_FIXED)); | |
3429 | req->flags &= ~REQ_F_NEED_CLEANUP; | |
3430 | ||
f2a8d5c7 PB |
3431 | if (ret != sp->len) |
3432 | req_set_fail_links(req); | |
e1e16097 | 3433 | io_req_complete(req, ret); |
f2a8d5c7 PB |
3434 | return 0; |
3435 | } | |
3436 | ||
3437 | static int io_splice_prep(struct io_kiocb *req, const struct io_uring_sqe *sqe) | |
3438 | { | |
3439 | struct io_splice* sp = &req->splice; | |
3440 | ||
3441 | sp->off_in = READ_ONCE(sqe->splice_off_in); | |
3442 | sp->off_out = READ_ONCE(sqe->off); | |
3443 | return __io_splice_prep(req, sqe); | |
3444 | } | |
3445 | ||
014db007 | 3446 | static int io_splice(struct io_kiocb *req, bool force_nonblock) |
7d67af2c PB |
3447 | { |
3448 | struct io_splice *sp = &req->splice; | |
3449 | struct file *in = sp->file_in; | |
3450 | struct file *out = sp->file_out; | |
3451 | unsigned int flags = sp->flags & ~SPLICE_F_FD_IN_FIXED; | |
3452 | loff_t *poff_in, *poff_out; | |
c9687426 | 3453 | long ret = 0; |
7d67af2c | 3454 | |
2fb3e822 PB |
3455 | if (force_nonblock) |
3456 | return -EAGAIN; | |
7d67af2c PB |
3457 | |
3458 | poff_in = (sp->off_in == -1) ? NULL : &sp->off_in; | |
3459 | poff_out = (sp->off_out == -1) ? NULL : &sp->off_out; | |
c9687426 | 3460 | |
948a7749 | 3461 | if (sp->len) |
c9687426 | 3462 | ret = do_splice(in, poff_in, out, poff_out, sp->len, flags); |
7d67af2c PB |
3463 | |
3464 | io_put_file(req, in, (sp->flags & SPLICE_F_FD_IN_FIXED)); | |
3465 | req->flags &= ~REQ_F_NEED_CLEANUP; | |
3466 | ||
7d67af2c PB |
3467 | if (ret != sp->len) |
3468 | req_set_fail_links(req); | |
e1e16097 | 3469 | io_req_complete(req, ret); |
7d67af2c PB |
3470 | return 0; |
3471 | } | |
3472 | ||
2b188cc1 JA |
3473 | /* |
3474 | * IORING_OP_NOP just posts a completion event, nothing else. | |
3475 | */ | |
229a7b63 | 3476 | static int io_nop(struct io_kiocb *req, struct io_comp_state *cs) |
2b188cc1 JA |
3477 | { |
3478 | struct io_ring_ctx *ctx = req->ctx; | |
2b188cc1 | 3479 | |
def596e9 JA |
3480 | if (unlikely(ctx->flags & IORING_SETUP_IOPOLL)) |
3481 | return -EINVAL; | |
3482 | ||
229a7b63 | 3483 | __io_req_complete(req, 0, 0, cs); |
2b188cc1 JA |
3484 | return 0; |
3485 | } | |
3486 | ||
3529d8c2 | 3487 | static int io_prep_fsync(struct io_kiocb *req, const struct io_uring_sqe *sqe) |
c992fe29 | 3488 | { |
6b06314c | 3489 | struct io_ring_ctx *ctx = req->ctx; |
c992fe29 | 3490 | |
09bb8394 JA |
3491 | if (!req->file) |
3492 | return -EBADF; | |
c992fe29 | 3493 | |
6b06314c | 3494 | if (unlikely(ctx->flags & IORING_SETUP_IOPOLL)) |
def596e9 | 3495 | return -EINVAL; |
edafccee | 3496 | if (unlikely(sqe->addr || sqe->ioprio || sqe->buf_index)) |
c992fe29 CH |
3497 | return -EINVAL; |
3498 | ||
8ed8d3c3 JA |
3499 | req->sync.flags = READ_ONCE(sqe->fsync_flags); |
3500 | if (unlikely(req->sync.flags & ~IORING_FSYNC_DATASYNC)) | |
3501 | return -EINVAL; | |
3502 | ||
3503 | req->sync.off = READ_ONCE(sqe->off); | |
3504 | req->sync.len = READ_ONCE(sqe->len); | |
c992fe29 CH |
3505 | return 0; |
3506 | } | |
3507 | ||
ac45abc0 | 3508 | static int io_fsync(struct io_kiocb *req, bool force_nonblock) |
8ed8d3c3 | 3509 | { |
8ed8d3c3 | 3510 | loff_t end = req->sync.off + req->sync.len; |
8ed8d3c3 JA |
3511 | int ret; |
3512 | ||
ac45abc0 PB |
3513 | /* fsync always requires a blocking context */ |
3514 | if (force_nonblock) | |
3515 | return -EAGAIN; | |
3516 | ||
9adbd45d | 3517 | ret = vfs_fsync_range(req->file, req->sync.off, |
8ed8d3c3 JA |
3518 | end > 0 ? end : LLONG_MAX, |
3519 | req->sync.flags & IORING_FSYNC_DATASYNC); | |
3520 | if (ret < 0) | |
3521 | req_set_fail_links(req); | |
e1e16097 | 3522 | io_req_complete(req, ret); |
c992fe29 CH |
3523 | return 0; |
3524 | } | |
3525 | ||
d63d1b5e JA |
3526 | static int io_fallocate_prep(struct io_kiocb *req, |
3527 | const struct io_uring_sqe *sqe) | |
3528 | { | |
3529 | if (sqe->ioprio || sqe->buf_index || sqe->rw_flags) | |
3530 | return -EINVAL; | |
3232dd02 PB |
3531 | if (unlikely(req->ctx->flags & IORING_SETUP_IOPOLL)) |
3532 | return -EINVAL; | |
d63d1b5e JA |
3533 | |
3534 | req->sync.off = READ_ONCE(sqe->off); | |
3535 | req->sync.len = READ_ONCE(sqe->addr); | |
3536 | req->sync.mode = READ_ONCE(sqe->len); | |
3537 | return 0; | |
3538 | } | |
3539 | ||
014db007 | 3540 | static int io_fallocate(struct io_kiocb *req, bool force_nonblock) |
5d17b4a4 | 3541 | { |
ac45abc0 PB |
3542 | int ret; |
3543 | ||
d63d1b5e | 3544 | /* fallocate always requiring blocking context */ |
ac45abc0 | 3545 | if (force_nonblock) |
5d17b4a4 | 3546 | return -EAGAIN; |
ac45abc0 PB |
3547 | ret = vfs_fallocate(req->file, req->sync.mode, req->sync.off, |
3548 | req->sync.len); | |
ac45abc0 PB |
3549 | if (ret < 0) |
3550 | req_set_fail_links(req); | |
e1e16097 | 3551 | io_req_complete(req, ret); |
5d17b4a4 JA |
3552 | return 0; |
3553 | } | |
3554 | ||
ec65fea5 | 3555 | static int __io_openat_prep(struct io_kiocb *req, const struct io_uring_sqe *sqe) |
b7bb4f7d | 3556 | { |
f8748881 | 3557 | const char __user *fname; |
15b71abe | 3558 | int ret; |
b7bb4f7d | 3559 | |
ec65fea5 | 3560 | if (unlikely(sqe->ioprio || sqe->buf_index)) |
15b71abe | 3561 | return -EINVAL; |
ec65fea5 | 3562 | if (unlikely(req->flags & REQ_F_FIXED_FILE)) |
cf3040ca | 3563 | return -EBADF; |
03b1230c | 3564 | |
ec65fea5 PB |
3565 | /* open.how should be already initialised */ |
3566 | if (!(req->open.how.flags & O_PATH) && force_o_largefile()) | |
08a1d26e | 3567 | req->open.how.flags |= O_LARGEFILE; |
3529d8c2 | 3568 | |
25e72d10 PB |
3569 | req->open.dfd = READ_ONCE(sqe->fd); |
3570 | fname = u64_to_user_ptr(READ_ONCE(sqe->addr)); | |
f8748881 | 3571 | req->open.filename = getname(fname); |
15b71abe JA |
3572 | if (IS_ERR(req->open.filename)) { |
3573 | ret = PTR_ERR(req->open.filename); | |
3574 | req->open.filename = NULL; | |
3575 | return ret; | |
3576 | } | |
4022e7af | 3577 | req->open.nofile = rlimit(RLIMIT_NOFILE); |
8fef80bf | 3578 | req->flags |= REQ_F_NEED_CLEANUP; |
15b71abe | 3579 | return 0; |
03b1230c JA |
3580 | } |
3581 | ||
ec65fea5 PB |
3582 | static int io_openat_prep(struct io_kiocb *req, const struct io_uring_sqe *sqe) |
3583 | { | |
3584 | u64 flags, mode; | |
3585 | ||
4eb8dded JA |
3586 | if (unlikely(req->ctx->flags & (IORING_SETUP_IOPOLL|IORING_SETUP_SQPOLL))) |
3587 | return -EINVAL; | |
ec65fea5 PB |
3588 | if (req->flags & REQ_F_NEED_CLEANUP) |
3589 | return 0; | |
3590 | mode = READ_ONCE(sqe->len); | |
3591 | flags = READ_ONCE(sqe->open_flags); | |
3592 | req->open.how = build_open_how(flags, mode); | |
3593 | return __io_openat_prep(req, sqe); | |
3594 | } | |
3595 | ||
cebdb986 | 3596 | static int io_openat2_prep(struct io_kiocb *req, const struct io_uring_sqe *sqe) |
aa1fa28f | 3597 | { |
cebdb986 | 3598 | struct open_how __user *how; |
cebdb986 | 3599 | size_t len; |
0fa03c62 JA |
3600 | int ret; |
3601 | ||
4eb8dded JA |
3602 | if (unlikely(req->ctx->flags & (IORING_SETUP_IOPOLL|IORING_SETUP_SQPOLL))) |
3603 | return -EINVAL; | |
0bdbdd08 PB |
3604 | if (req->flags & REQ_F_NEED_CLEANUP) |
3605 | return 0; | |
cebdb986 JA |
3606 | how = u64_to_user_ptr(READ_ONCE(sqe->addr2)); |
3607 | len = READ_ONCE(sqe->len); | |
cebdb986 JA |
3608 | if (len < OPEN_HOW_SIZE_VER0) |
3609 | return -EINVAL; | |
3529d8c2 | 3610 | |
cebdb986 JA |
3611 | ret = copy_struct_from_user(&req->open.how, sizeof(req->open.how), how, |
3612 | len); | |
3613 | if (ret) | |
3614 | return ret; | |
3529d8c2 | 3615 | |
ec65fea5 | 3616 | return __io_openat_prep(req, sqe); |
cebdb986 JA |
3617 | } |
3618 | ||
014db007 | 3619 | static int io_openat2(struct io_kiocb *req, bool force_nonblock) |
15b71abe JA |
3620 | { |
3621 | struct open_flags op; | |
15b71abe JA |
3622 | struct file *file; |
3623 | int ret; | |
3624 | ||
f86cd20c | 3625 | if (force_nonblock) |
15b71abe | 3626 | return -EAGAIN; |
15b71abe | 3627 | |
cebdb986 | 3628 | ret = build_open_flags(&req->open.how, &op); |
15b71abe JA |
3629 | if (ret) |
3630 | goto err; | |
3631 | ||
4022e7af | 3632 | ret = __get_unused_fd_flags(req->open.how.flags, req->open.nofile); |
15b71abe JA |
3633 | if (ret < 0) |
3634 | goto err; | |
3635 | ||
3636 | file = do_filp_open(req->open.dfd, req->open.filename, &op); | |
3637 | if (IS_ERR(file)) { | |
3638 | put_unused_fd(ret); | |
3639 | ret = PTR_ERR(file); | |
3640 | } else { | |
3641 | fsnotify_open(file); | |
3642 | fd_install(ret, file); | |
3643 | } | |
3644 | err: | |
3645 | putname(req->open.filename); | |
8fef80bf | 3646 | req->flags &= ~REQ_F_NEED_CLEANUP; |
15b71abe JA |
3647 | if (ret < 0) |
3648 | req_set_fail_links(req); | |
e1e16097 | 3649 | io_req_complete(req, ret); |
15b71abe JA |
3650 | return 0; |
3651 | } | |
3652 | ||
014db007 | 3653 | static int io_openat(struct io_kiocb *req, bool force_nonblock) |
cebdb986 | 3654 | { |
014db007 | 3655 | return io_openat2(req, force_nonblock); |
cebdb986 JA |
3656 | } |
3657 | ||
067524e9 JA |
3658 | static int io_remove_buffers_prep(struct io_kiocb *req, |
3659 | const struct io_uring_sqe *sqe) | |
3660 | { | |
3661 | struct io_provide_buf *p = &req->pbuf; | |
3662 | u64 tmp; | |
3663 | ||
3664 | if (sqe->ioprio || sqe->rw_flags || sqe->addr || sqe->len || sqe->off) | |
3665 | return -EINVAL; | |
3666 | ||
3667 | tmp = READ_ONCE(sqe->fd); | |
3668 | if (!tmp || tmp > USHRT_MAX) | |
3669 | return -EINVAL; | |
3670 | ||
3671 | memset(p, 0, sizeof(*p)); | |
3672 | p->nbufs = tmp; | |
3673 | p->bgid = READ_ONCE(sqe->buf_group); | |
3674 | return 0; | |
3675 | } | |
3676 | ||
3677 | static int __io_remove_buffers(struct io_ring_ctx *ctx, struct io_buffer *buf, | |
3678 | int bgid, unsigned nbufs) | |
3679 | { | |
3680 | unsigned i = 0; | |
3681 | ||
3682 | /* shouldn't happen */ | |
3683 | if (!nbufs) | |
3684 | return 0; | |
3685 | ||
3686 | /* the head kbuf is the list itself */ | |
3687 | while (!list_empty(&buf->list)) { | |
3688 | struct io_buffer *nxt; | |
3689 | ||
3690 | nxt = list_first_entry(&buf->list, struct io_buffer, list); | |
3691 | list_del(&nxt->list); | |
3692 | kfree(nxt); | |
3693 | if (++i == nbufs) | |
3694 | return i; | |
3695 | } | |
3696 | i++; | |
3697 | kfree(buf); | |
3698 | idr_remove(&ctx->io_buffer_idr, bgid); | |
3699 | ||
3700 | return i; | |
3701 | } | |
3702 | ||
229a7b63 JA |
3703 | static int io_remove_buffers(struct io_kiocb *req, bool force_nonblock, |
3704 | struct io_comp_state *cs) | |
067524e9 JA |
3705 | { |
3706 | struct io_provide_buf *p = &req->pbuf; | |
3707 | struct io_ring_ctx *ctx = req->ctx; | |
3708 | struct io_buffer *head; | |
3709 | int ret = 0; | |
3710 | ||
3711 | io_ring_submit_lock(ctx, !force_nonblock); | |
3712 | ||
3713 | lockdep_assert_held(&ctx->uring_lock); | |
3714 | ||
3715 | ret = -ENOENT; | |
3716 | head = idr_find(&ctx->io_buffer_idr, p->bgid); | |
3717 | if (head) | |
3718 | ret = __io_remove_buffers(ctx, head, p->bgid, p->nbufs); | |
3719 | ||
3720 | io_ring_submit_lock(ctx, !force_nonblock); | |
3721 | if (ret < 0) | |
3722 | req_set_fail_links(req); | |
229a7b63 | 3723 | __io_req_complete(req, ret, 0, cs); |
067524e9 JA |
3724 | return 0; |
3725 | } | |
3726 | ||
ddf0322d JA |
3727 | static int io_provide_buffers_prep(struct io_kiocb *req, |
3728 | const struct io_uring_sqe *sqe) | |
3729 | { | |
3730 | struct io_provide_buf *p = &req->pbuf; | |
3731 | u64 tmp; | |
3732 | ||
3733 | if (sqe->ioprio || sqe->rw_flags) | |
3734 | return -EINVAL; | |
3735 | ||
3736 | tmp = READ_ONCE(sqe->fd); | |
3737 | if (!tmp || tmp > USHRT_MAX) | |
3738 | return -E2BIG; | |
3739 | p->nbufs = tmp; | |
3740 | p->addr = READ_ONCE(sqe->addr); | |
3741 | p->len = READ_ONCE(sqe->len); | |
3742 | ||
efe68c1c | 3743 | if (!access_ok(u64_to_user_ptr(p->addr), (p->len * p->nbufs))) |
ddf0322d JA |
3744 | return -EFAULT; |
3745 | ||
3746 | p->bgid = READ_ONCE(sqe->buf_group); | |
3747 | tmp = READ_ONCE(sqe->off); | |
3748 | if (tmp > USHRT_MAX) | |
3749 | return -E2BIG; | |
3750 | p->bid = tmp; | |
3751 | return 0; | |
3752 | } | |
3753 | ||
3754 | static int io_add_buffers(struct io_provide_buf *pbuf, struct io_buffer **head) | |
3755 | { | |
3756 | struct io_buffer *buf; | |
3757 | u64 addr = pbuf->addr; | |
3758 | int i, bid = pbuf->bid; | |
3759 | ||
3760 | for (i = 0; i < pbuf->nbufs; i++) { | |
3761 | buf = kmalloc(sizeof(*buf), GFP_KERNEL); | |
3762 | if (!buf) | |
3763 | break; | |
3764 | ||
3765 | buf->addr = addr; | |
3766 | buf->len = pbuf->len; | |
3767 | buf->bid = bid; | |
3768 | addr += pbuf->len; | |
3769 | bid++; | |
3770 | if (!*head) { | |
3771 | INIT_LIST_HEAD(&buf->list); | |
3772 | *head = buf; | |
3773 | } else { | |
3774 | list_add_tail(&buf->list, &(*head)->list); | |
3775 | } | |
3776 | } | |
3777 | ||
3778 | return i ? i : -ENOMEM; | |
3779 | } | |
3780 | ||
229a7b63 JA |
3781 | static int io_provide_buffers(struct io_kiocb *req, bool force_nonblock, |
3782 | struct io_comp_state *cs) | |
ddf0322d JA |
3783 | { |
3784 | struct io_provide_buf *p = &req->pbuf; | |
3785 | struct io_ring_ctx *ctx = req->ctx; | |
3786 | struct io_buffer *head, *list; | |
3787 | int ret = 0; | |
3788 | ||
3789 | io_ring_submit_lock(ctx, !force_nonblock); | |
3790 | ||
3791 | lockdep_assert_held(&ctx->uring_lock); | |
3792 | ||
3793 | list = head = idr_find(&ctx->io_buffer_idr, p->bgid); | |
3794 | ||
3795 | ret = io_add_buffers(p, &head); | |
3796 | if (ret < 0) | |
3797 | goto out; | |
3798 | ||
3799 | if (!list) { | |
3800 | ret = idr_alloc(&ctx->io_buffer_idr, head, p->bgid, p->bgid + 1, | |
3801 | GFP_KERNEL); | |
3802 | if (ret < 0) { | |
067524e9 | 3803 | __io_remove_buffers(ctx, head, p->bgid, -1U); |
ddf0322d JA |
3804 | goto out; |
3805 | } | |
3806 | } | |
3807 | out: | |
3808 | io_ring_submit_unlock(ctx, !force_nonblock); | |
3809 | if (ret < 0) | |
3810 | req_set_fail_links(req); | |
229a7b63 | 3811 | __io_req_complete(req, ret, 0, cs); |
ddf0322d | 3812 | return 0; |
cebdb986 JA |
3813 | } |
3814 | ||
3e4827b0 JA |
3815 | static int io_epoll_ctl_prep(struct io_kiocb *req, |
3816 | const struct io_uring_sqe *sqe) | |
3817 | { | |
3818 | #if defined(CONFIG_EPOLL) | |
3819 | if (sqe->ioprio || sqe->buf_index) | |
3820 | return -EINVAL; | |
6ca56f84 | 3821 | if (unlikely(req->ctx->flags & (IORING_SETUP_IOPOLL | IORING_SETUP_SQPOLL))) |
3232dd02 | 3822 | return -EINVAL; |
3e4827b0 JA |
3823 | |
3824 | req->epoll.epfd = READ_ONCE(sqe->fd); | |
3825 | req->epoll.op = READ_ONCE(sqe->len); | |
3826 | req->epoll.fd = READ_ONCE(sqe->off); | |
3827 | ||
3828 | if (ep_op_has_event(req->epoll.op)) { | |
3829 | struct epoll_event __user *ev; | |
3830 | ||
3831 | ev = u64_to_user_ptr(READ_ONCE(sqe->addr)); | |
3832 | if (copy_from_user(&req->epoll.event, ev, sizeof(*ev))) | |
3833 | return -EFAULT; | |
3834 | } | |
3835 | ||
3836 | return 0; | |
3837 | #else | |
3838 | return -EOPNOTSUPP; | |
3839 | #endif | |
3840 | } | |
3841 | ||
229a7b63 JA |
3842 | static int io_epoll_ctl(struct io_kiocb *req, bool force_nonblock, |
3843 | struct io_comp_state *cs) | |
3e4827b0 JA |
3844 | { |
3845 | #if defined(CONFIG_EPOLL) | |
3846 | struct io_epoll *ie = &req->epoll; | |
3847 | int ret; | |
3848 | ||
3849 | ret = do_epoll_ctl(ie->epfd, ie->op, ie->fd, &ie->event, force_nonblock); | |
3850 | if (force_nonblock && ret == -EAGAIN) | |
3851 | return -EAGAIN; | |
3852 | ||
3853 | if (ret < 0) | |
3854 | req_set_fail_links(req); | |
229a7b63 | 3855 | __io_req_complete(req, ret, 0, cs); |
3e4827b0 JA |
3856 | return 0; |
3857 | #else | |
3858 | return -EOPNOTSUPP; | |
3859 | #endif | |
3860 | } | |
3861 | ||
c1ca757b JA |
3862 | static int io_madvise_prep(struct io_kiocb *req, const struct io_uring_sqe *sqe) |
3863 | { | |
3864 | #if defined(CONFIG_ADVISE_SYSCALLS) && defined(CONFIG_MMU) | |
3865 | if (sqe->ioprio || sqe->buf_index || sqe->off) | |
3866 | return -EINVAL; | |
3232dd02 PB |
3867 | if (unlikely(req->ctx->flags & IORING_SETUP_IOPOLL)) |
3868 | return -EINVAL; | |
c1ca757b JA |
3869 | |
3870 | req->madvise.addr = READ_ONCE(sqe->addr); | |
3871 | req->madvise.len = READ_ONCE(sqe->len); | |
3872 | req->madvise.advice = READ_ONCE(sqe->fadvise_advice); | |
3873 | return 0; | |
3874 | #else | |
3875 | return -EOPNOTSUPP; | |
3876 | #endif | |
3877 | } | |
3878 | ||
014db007 | 3879 | static int io_madvise(struct io_kiocb *req, bool force_nonblock) |
c1ca757b JA |
3880 | { |
3881 | #if defined(CONFIG_ADVISE_SYSCALLS) && defined(CONFIG_MMU) | |
3882 | struct io_madvise *ma = &req->madvise; | |
3883 | int ret; | |
3884 | ||
3885 | if (force_nonblock) | |
3886 | return -EAGAIN; | |
3887 | ||
3888 | ret = do_madvise(ma->addr, ma->len, ma->advice); | |
3889 | if (ret < 0) | |
3890 | req_set_fail_links(req); | |
e1e16097 | 3891 | io_req_complete(req, ret); |
c1ca757b JA |
3892 | return 0; |
3893 | #else | |
3894 | return -EOPNOTSUPP; | |
3895 | #endif | |
3896 | } | |
3897 | ||
4840e418 JA |
3898 | static int io_fadvise_prep(struct io_kiocb *req, const struct io_uring_sqe *sqe) |
3899 | { | |
3900 | if (sqe->ioprio || sqe->buf_index || sqe->addr) | |
3901 | return -EINVAL; | |
3232dd02 PB |
3902 | if (unlikely(req->ctx->flags & IORING_SETUP_IOPOLL)) |
3903 | return -EINVAL; | |
4840e418 JA |
3904 | |
3905 | req->fadvise.offset = READ_ONCE(sqe->off); | |
3906 | req->fadvise.len = READ_ONCE(sqe->len); | |
3907 | req->fadvise.advice = READ_ONCE(sqe->fadvise_advice); | |
3908 | return 0; | |
3909 | } | |
3910 | ||
014db007 | 3911 | static int io_fadvise(struct io_kiocb *req, bool force_nonblock) |
4840e418 JA |
3912 | { |
3913 | struct io_fadvise *fa = &req->fadvise; | |
3914 | int ret; | |
3915 | ||
3e69426d JA |
3916 | if (force_nonblock) { |
3917 | switch (fa->advice) { | |
3918 | case POSIX_FADV_NORMAL: | |
3919 | case POSIX_FADV_RANDOM: | |
3920 | case POSIX_FADV_SEQUENTIAL: | |
3921 | break; | |
3922 | default: | |
3923 | return -EAGAIN; | |
3924 | } | |
3925 | } | |
4840e418 JA |
3926 | |
3927 | ret = vfs_fadvise(req->file, fa->offset, fa->len, fa->advice); | |
3928 | if (ret < 0) | |
3929 | req_set_fail_links(req); | |
e1e16097 | 3930 | io_req_complete(req, ret); |
4840e418 JA |
3931 | return 0; |
3932 | } | |
3933 | ||
eddc7ef5 JA |
3934 | static int io_statx_prep(struct io_kiocb *req, const struct io_uring_sqe *sqe) |
3935 | { | |
6ca56f84 | 3936 | if (unlikely(req->ctx->flags & (IORING_SETUP_IOPOLL | IORING_SETUP_SQPOLL))) |
3232dd02 | 3937 | return -EINVAL; |
eddc7ef5 JA |
3938 | if (sqe->ioprio || sqe->buf_index) |
3939 | return -EINVAL; | |
9c280f90 | 3940 | if (req->flags & REQ_F_FIXED_FILE) |
cf3040ca | 3941 | return -EBADF; |
eddc7ef5 | 3942 | |
1d9e1288 BM |
3943 | req->statx.dfd = READ_ONCE(sqe->fd); |
3944 | req->statx.mask = READ_ONCE(sqe->len); | |
e62753e4 | 3945 | req->statx.filename = u64_to_user_ptr(READ_ONCE(sqe->addr)); |
1d9e1288 BM |
3946 | req->statx.buffer = u64_to_user_ptr(READ_ONCE(sqe->addr2)); |
3947 | req->statx.flags = READ_ONCE(sqe->statx_flags); | |
eddc7ef5 JA |
3948 | |
3949 | return 0; | |
3950 | } | |
3951 | ||
014db007 | 3952 | static int io_statx(struct io_kiocb *req, bool force_nonblock) |
eddc7ef5 | 3953 | { |
1d9e1288 | 3954 | struct io_statx *ctx = &req->statx; |
eddc7ef5 JA |
3955 | int ret; |
3956 | ||
5b0bbee4 JA |
3957 | if (force_nonblock) { |
3958 | /* only need file table for an actual valid fd */ | |
3959 | if (ctx->dfd == -1 || ctx->dfd == AT_FDCWD) | |
3960 | req->flags |= REQ_F_NO_FILE_TABLE; | |
eddc7ef5 | 3961 | return -EAGAIN; |
5b0bbee4 | 3962 | } |
eddc7ef5 | 3963 | |
e62753e4 BM |
3964 | ret = do_statx(ctx->dfd, ctx->filename, ctx->flags, ctx->mask, |
3965 | ctx->buffer); | |
eddc7ef5 | 3966 | |
eddc7ef5 JA |
3967 | if (ret < 0) |
3968 | req_set_fail_links(req); | |
e1e16097 | 3969 | io_req_complete(req, ret); |
eddc7ef5 JA |
3970 | return 0; |
3971 | } | |
3972 | ||
b5dba59e JA |
3973 | static int io_close_prep(struct io_kiocb *req, const struct io_uring_sqe *sqe) |
3974 | { | |
3975 | /* | |
3976 | * If we queue this for async, it must not be cancellable. That would | |
7cdaf587 XW |
3977 | * leave the 'file' in an undeterminate state, and here need to modify |
3978 | * io_wq_work.flags, so initialize io_wq_work firstly. | |
b5dba59e | 3979 | */ |
7cdaf587 | 3980 | io_req_init_async(req); |
b5dba59e JA |
3981 | req->work.flags |= IO_WQ_WORK_NO_CANCEL; |
3982 | ||
3232dd02 PB |
3983 | if (unlikely(req->ctx->flags & (IORING_SETUP_IOPOLL|IORING_SETUP_SQPOLL))) |
3984 | return -EINVAL; | |
b5dba59e JA |
3985 | if (sqe->ioprio || sqe->off || sqe->addr || sqe->len || |
3986 | sqe->rw_flags || sqe->buf_index) | |
3987 | return -EINVAL; | |
9c280f90 | 3988 | if (req->flags & REQ_F_FIXED_FILE) |
cf3040ca | 3989 | return -EBADF; |
b5dba59e JA |
3990 | |
3991 | req->close.fd = READ_ONCE(sqe->fd); | |
0f212204 | 3992 | if ((req->file && req->file->f_op == &io_uring_fops)) |
fd2206e4 | 3993 | return -EBADF; |
b5dba59e | 3994 | |
3af73b28 | 3995 | req->close.put_file = NULL; |
b5dba59e | 3996 | return 0; |
b5dba59e JA |
3997 | } |
3998 | ||
229a7b63 JA |
3999 | static int io_close(struct io_kiocb *req, bool force_nonblock, |
4000 | struct io_comp_state *cs) | |
b5dba59e | 4001 | { |
3af73b28 | 4002 | struct io_close *close = &req->close; |
b5dba59e JA |
4003 | int ret; |
4004 | ||
3af73b28 PB |
4005 | /* might be already done during nonblock submission */ |
4006 | if (!close->put_file) { | |
4007 | ret = __close_fd_get_file(close->fd, &close->put_file); | |
4008 | if (ret < 0) | |
4009 | return (ret == -ENOENT) ? -EBADF : ret; | |
4010 | } | |
b5dba59e JA |
4011 | |
4012 | /* if the file has a flush method, be safe and punt to async */ | |
3af73b28 | 4013 | if (close->put_file->f_op->flush && force_nonblock) { |
24c74678 PB |
4014 | /* was never set, but play safe */ |
4015 | req->flags &= ~REQ_F_NOWAIT; | |
0bf0eefd | 4016 | /* avoid grabbing files - we don't need the files */ |
24c74678 | 4017 | req->flags |= REQ_F_NO_FILE_TABLE; |
0bf0eefd | 4018 | return -EAGAIN; |
a2100672 | 4019 | } |
b5dba59e | 4020 | |
3af73b28 PB |
4021 | /* No ->flush() or already async, safely close from here */ |
4022 | ret = filp_close(close->put_file, req->work.files); | |
4023 | if (ret < 0) | |
4024 | req_set_fail_links(req); | |
3af73b28 PB |
4025 | fput(close->put_file); |
4026 | close->put_file = NULL; | |
229a7b63 | 4027 | __io_req_complete(req, ret, 0, cs); |
1a417f4e | 4028 | return 0; |
b5dba59e JA |
4029 | } |
4030 | ||
3529d8c2 | 4031 | static int io_prep_sfr(struct io_kiocb *req, const struct io_uring_sqe *sqe) |
5d17b4a4 JA |
4032 | { |
4033 | struct io_ring_ctx *ctx = req->ctx; | |
5d17b4a4 JA |
4034 | |
4035 | if (!req->file) | |
4036 | return -EBADF; | |
5d17b4a4 JA |
4037 | |
4038 | if (unlikely(ctx->flags & IORING_SETUP_IOPOLL)) | |
4039 | return -EINVAL; | |
4040 | if (unlikely(sqe->addr || sqe->ioprio || sqe->buf_index)) | |
4041 | return -EINVAL; | |
4042 | ||
8ed8d3c3 JA |
4043 | req->sync.off = READ_ONCE(sqe->off); |
4044 | req->sync.len = READ_ONCE(sqe->len); | |
4045 | req->sync.flags = READ_ONCE(sqe->sync_range_flags); | |
8ed8d3c3 JA |
4046 | return 0; |
4047 | } | |
4048 | ||
ac45abc0 | 4049 | static int io_sync_file_range(struct io_kiocb *req, bool force_nonblock) |
8ed8d3c3 | 4050 | { |
8ed8d3c3 JA |
4051 | int ret; |
4052 | ||
ac45abc0 PB |
4053 | /* sync_file_range always requires a blocking context */ |
4054 | if (force_nonblock) | |
4055 | return -EAGAIN; | |
4056 | ||
9adbd45d | 4057 | ret = sync_file_range(req->file, req->sync.off, req->sync.len, |
8ed8d3c3 JA |
4058 | req->sync.flags); |
4059 | if (ret < 0) | |
4060 | req_set_fail_links(req); | |
e1e16097 | 4061 | io_req_complete(req, ret); |
5d17b4a4 JA |
4062 | return 0; |
4063 | } | |
4064 | ||
469956e8 | 4065 | #if defined(CONFIG_NET) |
02d27d89 PB |
4066 | static int io_setup_async_msg(struct io_kiocb *req, |
4067 | struct io_async_msghdr *kmsg) | |
4068 | { | |
4069 | if (req->io) | |
4070 | return -EAGAIN; | |
4071 | if (io_alloc_async_ctx(req)) { | |
4072 | if (kmsg->iov != kmsg->fast_iov) | |
4073 | kfree(kmsg->iov); | |
4074 | return -ENOMEM; | |
4075 | } | |
4076 | req->flags |= REQ_F_NEED_CLEANUP; | |
4077 | memcpy(&req->io->msg, kmsg, sizeof(*kmsg)); | |
4078 | return -EAGAIN; | |
4079 | } | |
4080 | ||
2ae523ed PB |
4081 | static int io_sendmsg_copy_hdr(struct io_kiocb *req, |
4082 | struct io_async_msghdr *iomsg) | |
4083 | { | |
4084 | iomsg->iov = iomsg->fast_iov; | |
4085 | iomsg->msg.msg_name = &iomsg->addr; | |
4086 | return sendmsg_copy_msghdr(&iomsg->msg, req->sr_msg.umsg, | |
4087 | req->sr_msg.msg_flags, &iomsg->iov); | |
4088 | } | |
4089 | ||
3529d8c2 | 4090 | static int io_sendmsg_prep(struct io_kiocb *req, const struct io_uring_sqe *sqe) |
03b1230c | 4091 | { |
e47293fd | 4092 | struct io_sr_msg *sr = &req->sr_msg; |
3529d8c2 | 4093 | struct io_async_ctx *io = req->io; |
99bc4c38 | 4094 | int ret; |
03b1230c | 4095 | |
d2b6f48b PB |
4096 | if (unlikely(req->ctx->flags & IORING_SETUP_IOPOLL)) |
4097 | return -EINVAL; | |
4098 | ||
e47293fd | 4099 | sr->msg_flags = READ_ONCE(sqe->msg_flags); |
270a5940 | 4100 | sr->umsg = u64_to_user_ptr(READ_ONCE(sqe->addr)); |
fddaface | 4101 | sr->len = READ_ONCE(sqe->len); |
3529d8c2 | 4102 | |
d8768362 JA |
4103 | #ifdef CONFIG_COMPAT |
4104 | if (req->ctx->compat) | |
4105 | sr->msg_flags |= MSG_CMSG_COMPAT; | |
4106 | #endif | |
4107 | ||
fddaface | 4108 | if (!io || req->opcode == IORING_OP_SEND) |
3529d8c2 | 4109 | return 0; |
5f798bea PB |
4110 | /* iovec is already imported */ |
4111 | if (req->flags & REQ_F_NEED_CLEANUP) | |
4112 | return 0; | |
3529d8c2 | 4113 | |
2ae523ed | 4114 | ret = io_sendmsg_copy_hdr(req, &io->msg); |
99bc4c38 PB |
4115 | if (!ret) |
4116 | req->flags |= REQ_F_NEED_CLEANUP; | |
4117 | return ret; | |
03b1230c JA |
4118 | } |
4119 | ||
229a7b63 JA |
4120 | static int io_sendmsg(struct io_kiocb *req, bool force_nonblock, |
4121 | struct io_comp_state *cs) | |
aa1fa28f | 4122 | { |
6b754c8b | 4123 | struct io_async_msghdr iomsg, *kmsg; |
0fa03c62 | 4124 | struct socket *sock; |
7a7cacba | 4125 | unsigned flags; |
0fa03c62 JA |
4126 | int ret; |
4127 | ||
0fa03c62 | 4128 | sock = sock_from_file(req->file, &ret); |
7a7cacba PB |
4129 | if (unlikely(!sock)) |
4130 | return ret; | |
3529d8c2 | 4131 | |
7a7cacba PB |
4132 | if (req->io) { |
4133 | kmsg = &req->io->msg; | |
4134 | kmsg->msg.msg_name = &req->io->msg.addr; | |
4135 | /* if iov is set, it's allocated already */ | |
4136 | if (!kmsg->iov) | |
4137 | kmsg->iov = kmsg->fast_iov; | |
4138 | kmsg->msg.msg_iter.iov = kmsg->iov; | |
4139 | } else { | |
4140 | ret = io_sendmsg_copy_hdr(req, &iomsg); | |
4141 | if (ret) | |
4142 | return ret; | |
4143 | kmsg = &iomsg; | |
0fa03c62 | 4144 | } |
0fa03c62 | 4145 | |
7a7cacba PB |
4146 | flags = req->sr_msg.msg_flags; |
4147 | if (flags & MSG_DONTWAIT) | |
4148 | req->flags |= REQ_F_NOWAIT; | |
4149 | else if (force_nonblock) | |
4150 | flags |= MSG_DONTWAIT; | |
e47293fd | 4151 | |
7a7cacba PB |
4152 | ret = __sys_sendmsg_sock(sock, &kmsg->msg, flags); |
4153 | if (force_nonblock && ret == -EAGAIN) | |
4154 | return io_setup_async_msg(req, kmsg); | |
4155 | if (ret == -ERESTARTSYS) | |
4156 | ret = -EINTR; | |
0fa03c62 | 4157 | |
6b754c8b | 4158 | if (kmsg->iov != kmsg->fast_iov) |
0b416c3e | 4159 | kfree(kmsg->iov); |
99bc4c38 | 4160 | req->flags &= ~REQ_F_NEED_CLEANUP; |
4e88d6e7 JA |
4161 | if (ret < 0) |
4162 | req_set_fail_links(req); | |
229a7b63 | 4163 | __io_req_complete(req, ret, 0, cs); |
5d17b4a4 | 4164 | return 0; |
03b1230c | 4165 | } |
aa1fa28f | 4166 | |
229a7b63 JA |
4167 | static int io_send(struct io_kiocb *req, bool force_nonblock, |
4168 | struct io_comp_state *cs) | |
fddaface | 4169 | { |
7a7cacba PB |
4170 | struct io_sr_msg *sr = &req->sr_msg; |
4171 | struct msghdr msg; | |
4172 | struct iovec iov; | |
fddaface | 4173 | struct socket *sock; |
7a7cacba | 4174 | unsigned flags; |
fddaface JA |
4175 | int ret; |
4176 | ||
fddaface | 4177 | sock = sock_from_file(req->file, &ret); |
7a7cacba PB |
4178 | if (unlikely(!sock)) |
4179 | return ret; | |
fddaface | 4180 | |
7a7cacba PB |
4181 | ret = import_single_range(WRITE, sr->buf, sr->len, &iov, &msg.msg_iter); |
4182 | if (unlikely(ret)) | |
14c32eee | 4183 | return ret;; |
fddaface | 4184 | |
7a7cacba PB |
4185 | msg.msg_name = NULL; |
4186 | msg.msg_control = NULL; | |
4187 | msg.msg_controllen = 0; | |
4188 | msg.msg_namelen = 0; | |
fddaface | 4189 | |
7a7cacba PB |
4190 | flags = req->sr_msg.msg_flags; |
4191 | if (flags & MSG_DONTWAIT) | |
4192 | req->flags |= REQ_F_NOWAIT; | |
4193 | else if (force_nonblock) | |
4194 | flags |= MSG_DONTWAIT; | |
fddaface | 4195 | |
7a7cacba PB |
4196 | msg.msg_flags = flags; |
4197 | ret = sock_sendmsg(sock, &msg); | |
4198 | if (force_nonblock && ret == -EAGAIN) | |
4199 | return -EAGAIN; | |
4200 | if (ret == -ERESTARTSYS) | |
4201 | ret = -EINTR; | |
fddaface | 4202 | |
fddaface JA |
4203 | if (ret < 0) |
4204 | req_set_fail_links(req); | |
229a7b63 | 4205 | __io_req_complete(req, ret, 0, cs); |
fddaface | 4206 | return 0; |
fddaface JA |
4207 | } |
4208 | ||
1400e697 PB |
4209 | static int __io_recvmsg_copy_hdr(struct io_kiocb *req, |
4210 | struct io_async_msghdr *iomsg) | |
52de1fe1 JA |
4211 | { |
4212 | struct io_sr_msg *sr = &req->sr_msg; | |
4213 | struct iovec __user *uiov; | |
4214 | size_t iov_len; | |
4215 | int ret; | |
4216 | ||
1400e697 PB |
4217 | ret = __copy_msghdr_from_user(&iomsg->msg, sr->umsg, |
4218 | &iomsg->uaddr, &uiov, &iov_len); | |
52de1fe1 JA |
4219 | if (ret) |
4220 | return ret; | |
4221 | ||
4222 | if (req->flags & REQ_F_BUFFER_SELECT) { | |
4223 | if (iov_len > 1) | |
4224 | return -EINVAL; | |
1400e697 | 4225 | if (copy_from_user(iomsg->iov, uiov, sizeof(*uiov))) |
52de1fe1 | 4226 | return -EFAULT; |
1400e697 PB |
4227 | sr->len = iomsg->iov[0].iov_len; |
4228 | iov_iter_init(&iomsg->msg.msg_iter, READ, iomsg->iov, 1, | |
52de1fe1 | 4229 | sr->len); |
1400e697 | 4230 | iomsg->iov = NULL; |
52de1fe1 JA |
4231 | } else { |
4232 | ret = import_iovec(READ, uiov, iov_len, UIO_FASTIOV, | |
1400e697 | 4233 | &iomsg->iov, &iomsg->msg.msg_iter); |
52de1fe1 JA |
4234 | if (ret > 0) |
4235 | ret = 0; | |
4236 | } | |
4237 | ||
4238 | return ret; | |
4239 | } | |
4240 | ||
4241 | #ifdef CONFIG_COMPAT | |
4242 | static int __io_compat_recvmsg_copy_hdr(struct io_kiocb *req, | |
1400e697 | 4243 | struct io_async_msghdr *iomsg) |
52de1fe1 JA |
4244 | { |
4245 | struct compat_msghdr __user *msg_compat; | |
4246 | struct io_sr_msg *sr = &req->sr_msg; | |
4247 | struct compat_iovec __user *uiov; | |
4248 | compat_uptr_t ptr; | |
4249 | compat_size_t len; | |
4250 | int ret; | |
4251 | ||
270a5940 | 4252 | msg_compat = (struct compat_msghdr __user *) sr->umsg; |
1400e697 | 4253 | ret = __get_compat_msghdr(&iomsg->msg, msg_compat, &iomsg->uaddr, |
52de1fe1 JA |
4254 | &ptr, &len); |
4255 | if (ret) | |
4256 | return ret; | |
4257 | ||
4258 | uiov = compat_ptr(ptr); | |
4259 | if (req->flags & REQ_F_BUFFER_SELECT) { | |
4260 | compat_ssize_t clen; | |
4261 | ||
4262 | if (len > 1) | |
4263 | return -EINVAL; | |
4264 | if (!access_ok(uiov, sizeof(*uiov))) | |
4265 | return -EFAULT; | |
4266 | if (__get_user(clen, &uiov->iov_len)) | |
4267 | return -EFAULT; | |
4268 | if (clen < 0) | |
4269 | return -EINVAL; | |
1400e697 PB |
4270 | sr->len = iomsg->iov[0].iov_len; |
4271 | iomsg->iov = NULL; | |
52de1fe1 JA |
4272 | } else { |
4273 | ret = compat_import_iovec(READ, uiov, len, UIO_FASTIOV, | |
1400e697 PB |
4274 | &iomsg->iov, |
4275 | &iomsg->msg.msg_iter); | |
52de1fe1 JA |
4276 | if (ret < 0) |
4277 | return ret; | |
4278 | } | |
4279 | ||
4280 | return 0; | |
4281 | } | |
4282 | #endif | |
4283 | ||
1400e697 PB |
4284 | static int io_recvmsg_copy_hdr(struct io_kiocb *req, |
4285 | struct io_async_msghdr *iomsg) | |
52de1fe1 | 4286 | { |
1400e697 PB |
4287 | iomsg->msg.msg_name = &iomsg->addr; |
4288 | iomsg->iov = iomsg->fast_iov; | |
52de1fe1 JA |
4289 | |
4290 | #ifdef CONFIG_COMPAT | |
4291 | if (req->ctx->compat) | |
1400e697 | 4292 | return __io_compat_recvmsg_copy_hdr(req, iomsg); |
fddaface | 4293 | #endif |
52de1fe1 | 4294 | |
1400e697 | 4295 | return __io_recvmsg_copy_hdr(req, iomsg); |
52de1fe1 JA |
4296 | } |
4297 | ||
bcda7baa | 4298 | static struct io_buffer *io_recv_buffer_select(struct io_kiocb *req, |
7fbb1b54 | 4299 | bool needs_lock) |
bcda7baa JA |
4300 | { |
4301 | struct io_sr_msg *sr = &req->sr_msg; | |
4302 | struct io_buffer *kbuf; | |
4303 | ||
bcda7baa JA |
4304 | kbuf = io_buffer_select(req, &sr->len, sr->bgid, sr->kbuf, needs_lock); |
4305 | if (IS_ERR(kbuf)) | |
4306 | return kbuf; | |
4307 | ||
4308 | sr->kbuf = kbuf; | |
4309 | req->flags |= REQ_F_BUFFER_SELECTED; | |
bcda7baa | 4310 | return kbuf; |
fddaface JA |
4311 | } |
4312 | ||
7fbb1b54 PB |
4313 | static inline unsigned int io_put_recv_kbuf(struct io_kiocb *req) |
4314 | { | |
4315 | return io_put_kbuf(req, req->sr_msg.kbuf); | |
4316 | } | |
4317 | ||
3529d8c2 JA |
4318 | static int io_recvmsg_prep(struct io_kiocb *req, |
4319 | const struct io_uring_sqe *sqe) | |
aa1fa28f | 4320 | { |
e47293fd | 4321 | struct io_sr_msg *sr = &req->sr_msg; |
3529d8c2 | 4322 | struct io_async_ctx *io = req->io; |
99bc4c38 | 4323 | int ret; |
3529d8c2 | 4324 | |
d2b6f48b PB |
4325 | if (unlikely(req->ctx->flags & IORING_SETUP_IOPOLL)) |
4326 | return -EINVAL; | |
4327 | ||
3529d8c2 | 4328 | sr->msg_flags = READ_ONCE(sqe->msg_flags); |
270a5940 | 4329 | sr->umsg = u64_to_user_ptr(READ_ONCE(sqe->addr)); |
0b7b21e4 | 4330 | sr->len = READ_ONCE(sqe->len); |
bcda7baa | 4331 | sr->bgid = READ_ONCE(sqe->buf_group); |
06b76d44 | 4332 | |
d8768362 JA |
4333 | #ifdef CONFIG_COMPAT |
4334 | if (req->ctx->compat) | |
4335 | sr->msg_flags |= MSG_CMSG_COMPAT; | |
4336 | #endif | |
4337 | ||
fddaface | 4338 | if (!io || req->opcode == IORING_OP_RECV) |
06b76d44 | 4339 | return 0; |
5f798bea PB |
4340 | /* iovec is already imported */ |
4341 | if (req->flags & REQ_F_NEED_CLEANUP) | |
4342 | return 0; | |
03b1230c | 4343 | |
1400e697 | 4344 | ret = io_recvmsg_copy_hdr(req, &io->msg); |
99bc4c38 PB |
4345 | if (!ret) |
4346 | req->flags |= REQ_F_NEED_CLEANUP; | |
4347 | return ret; | |
aa1fa28f JA |
4348 | } |
4349 | ||
229a7b63 JA |
4350 | static int io_recvmsg(struct io_kiocb *req, bool force_nonblock, |
4351 | struct io_comp_state *cs) | |
aa1fa28f | 4352 | { |
6b754c8b | 4353 | struct io_async_msghdr iomsg, *kmsg; |
03b1230c | 4354 | struct socket *sock; |
7fbb1b54 | 4355 | struct io_buffer *kbuf; |
7a7cacba | 4356 | unsigned flags; |
52de1fe1 | 4357 | int ret, cflags = 0; |
03b1230c | 4358 | |
03b1230c | 4359 | sock = sock_from_file(req->file, &ret); |
7a7cacba PB |
4360 | if (unlikely(!sock)) |
4361 | return ret; | |
3529d8c2 | 4362 | |
7a7cacba PB |
4363 | if (req->io) { |
4364 | kmsg = &req->io->msg; | |
4365 | kmsg->msg.msg_name = &req->io->msg.addr; | |
4366 | /* if iov is set, it's allocated already */ | |
4367 | if (!kmsg->iov) | |
4368 | kmsg->iov = kmsg->fast_iov; | |
4369 | kmsg->msg.msg_iter.iov = kmsg->iov; | |
4370 | } else { | |
4371 | ret = io_recvmsg_copy_hdr(req, &iomsg); | |
4372 | if (ret) | |
681fda8d | 4373 | return ret; |
7a7cacba PB |
4374 | kmsg = &iomsg; |
4375 | } | |
03b1230c | 4376 | |
bc02ef33 | 4377 | if (req->flags & REQ_F_BUFFER_SELECT) { |
7fbb1b54 | 4378 | kbuf = io_recv_buffer_select(req, !force_nonblock); |
bc02ef33 | 4379 | if (IS_ERR(kbuf)) |
52de1fe1 | 4380 | return PTR_ERR(kbuf); |
7a7cacba PB |
4381 | kmsg->fast_iov[0].iov_base = u64_to_user_ptr(kbuf->addr); |
4382 | iov_iter_init(&kmsg->msg.msg_iter, READ, kmsg->iov, | |
4383 | 1, req->sr_msg.len); | |
4384 | } | |
52de1fe1 | 4385 | |
7a7cacba PB |
4386 | flags = req->sr_msg.msg_flags; |
4387 | if (flags & MSG_DONTWAIT) | |
4388 | req->flags |= REQ_F_NOWAIT; | |
4389 | else if (force_nonblock) | |
4390 | flags |= MSG_DONTWAIT; | |
e47293fd | 4391 | |
7a7cacba PB |
4392 | ret = __sys_recvmsg_sock(sock, &kmsg->msg, req->sr_msg.umsg, |
4393 | kmsg->uaddr, flags); | |
0e1b6fe3 PB |
4394 | if (force_nonblock && ret == -EAGAIN) |
4395 | return io_setup_async_msg(req, kmsg); | |
7a7cacba PB |
4396 | if (ret == -ERESTARTSYS) |
4397 | ret = -EINTR; | |
03b1230c | 4398 | |
7fbb1b54 PB |
4399 | if (req->flags & REQ_F_BUFFER_SELECTED) |
4400 | cflags = io_put_recv_kbuf(req); | |
6b754c8b | 4401 | if (kmsg->iov != kmsg->fast_iov) |
0b416c3e | 4402 | kfree(kmsg->iov); |
99bc4c38 | 4403 | req->flags &= ~REQ_F_NEED_CLEANUP; |
4e88d6e7 JA |
4404 | if (ret < 0) |
4405 | req_set_fail_links(req); | |
229a7b63 | 4406 | __io_req_complete(req, ret, cflags, cs); |
03b1230c | 4407 | return 0; |
0fa03c62 | 4408 | } |
5d17b4a4 | 4409 | |
229a7b63 JA |
4410 | static int io_recv(struct io_kiocb *req, bool force_nonblock, |
4411 | struct io_comp_state *cs) | |
fddaface | 4412 | { |
6b754c8b | 4413 | struct io_buffer *kbuf; |
7a7cacba PB |
4414 | struct io_sr_msg *sr = &req->sr_msg; |
4415 | struct msghdr msg; | |
4416 | void __user *buf = sr->buf; | |
fddaface | 4417 | struct socket *sock; |
7a7cacba PB |
4418 | struct iovec iov; |
4419 | unsigned flags; | |
bcda7baa | 4420 | int ret, cflags = 0; |
fddaface | 4421 | |
fddaface | 4422 | sock = sock_from_file(req->file, &ret); |
7a7cacba PB |
4423 | if (unlikely(!sock)) |
4424 | return ret; | |
fddaface | 4425 | |
bc02ef33 | 4426 | if (req->flags & REQ_F_BUFFER_SELECT) { |
7fbb1b54 | 4427 | kbuf = io_recv_buffer_select(req, !force_nonblock); |
bcda7baa JA |
4428 | if (IS_ERR(kbuf)) |
4429 | return PTR_ERR(kbuf); | |
7a7cacba | 4430 | buf = u64_to_user_ptr(kbuf->addr); |
bc02ef33 | 4431 | } |
bcda7baa | 4432 | |
7a7cacba | 4433 | ret = import_single_range(READ, buf, sr->len, &iov, &msg.msg_iter); |
14c32eee PB |
4434 | if (unlikely(ret)) |
4435 | goto out_free; | |
fddaface | 4436 | |
7a7cacba PB |
4437 | msg.msg_name = NULL; |
4438 | msg.msg_control = NULL; | |
4439 | msg.msg_controllen = 0; | |
4440 | msg.msg_namelen = 0; | |
4441 | msg.msg_iocb = NULL; | |
4442 | msg.msg_flags = 0; | |
fddaface | 4443 | |
7a7cacba PB |
4444 | flags = req->sr_msg.msg_flags; |
4445 | if (flags & MSG_DONTWAIT) | |
4446 | req->flags |= REQ_F_NOWAIT; | |
4447 | else if (force_nonblock) | |
4448 | flags |= MSG_DONTWAIT; | |
4449 | ||
4450 | ret = sock_recvmsg(sock, &msg, flags); | |
4451 | if (force_nonblock && ret == -EAGAIN) | |
4452 | return -EAGAIN; | |
4453 | if (ret == -ERESTARTSYS) | |
4454 | ret = -EINTR; | |
14c32eee | 4455 | out_free: |
7fbb1b54 PB |
4456 | if (req->flags & REQ_F_BUFFER_SELECTED) |
4457 | cflags = io_put_recv_kbuf(req); | |
fddaface JA |
4458 | if (ret < 0) |
4459 | req_set_fail_links(req); | |
229a7b63 | 4460 | __io_req_complete(req, ret, cflags, cs); |
fddaface | 4461 | return 0; |
fddaface JA |
4462 | } |
4463 | ||
3529d8c2 | 4464 | static int io_accept_prep(struct io_kiocb *req, const struct io_uring_sqe *sqe) |
17f2fe35 | 4465 | { |
8ed8d3c3 JA |
4466 | struct io_accept *accept = &req->accept; |
4467 | ||
17f2fe35 JA |
4468 | if (unlikely(req->ctx->flags & (IORING_SETUP_IOPOLL|IORING_SETUP_SQPOLL))) |
4469 | return -EINVAL; | |
8042d6ce | 4470 | if (sqe->ioprio || sqe->len || sqe->buf_index) |
17f2fe35 JA |
4471 | return -EINVAL; |
4472 | ||
d55e5f5b JA |
4473 | accept->addr = u64_to_user_ptr(READ_ONCE(sqe->addr)); |
4474 | accept->addr_len = u64_to_user_ptr(READ_ONCE(sqe->addr2)); | |
8ed8d3c3 | 4475 | accept->flags = READ_ONCE(sqe->accept_flags); |
09952e3e | 4476 | accept->nofile = rlimit(RLIMIT_NOFILE); |
8ed8d3c3 | 4477 | return 0; |
8ed8d3c3 | 4478 | } |
17f2fe35 | 4479 | |
229a7b63 JA |
4480 | static int io_accept(struct io_kiocb *req, bool force_nonblock, |
4481 | struct io_comp_state *cs) | |
8ed8d3c3 JA |
4482 | { |
4483 | struct io_accept *accept = &req->accept; | |
ac45abc0 | 4484 | unsigned int file_flags = force_nonblock ? O_NONBLOCK : 0; |
8ed8d3c3 JA |
4485 | int ret; |
4486 | ||
e697deed JX |
4487 | if (req->file->f_flags & O_NONBLOCK) |
4488 | req->flags |= REQ_F_NOWAIT; | |
4489 | ||
8ed8d3c3 | 4490 | ret = __sys_accept4_file(req->file, file_flags, accept->addr, |
09952e3e JA |
4491 | accept->addr_len, accept->flags, |
4492 | accept->nofile); | |
8ed8d3c3 | 4493 | if (ret == -EAGAIN && force_nonblock) |
17f2fe35 | 4494 | return -EAGAIN; |
ac45abc0 PB |
4495 | if (ret < 0) { |
4496 | if (ret == -ERESTARTSYS) | |
4497 | ret = -EINTR; | |
4e88d6e7 | 4498 | req_set_fail_links(req); |
ac45abc0 | 4499 | } |
229a7b63 | 4500 | __io_req_complete(req, ret, 0, cs); |
17f2fe35 | 4501 | return 0; |
8ed8d3c3 JA |
4502 | } |
4503 | ||
3529d8c2 | 4504 | static int io_connect_prep(struct io_kiocb *req, const struct io_uring_sqe *sqe) |
f499a021 | 4505 | { |
3529d8c2 JA |
4506 | struct io_connect *conn = &req->connect; |
4507 | struct io_async_ctx *io = req->io; | |
f499a021 | 4508 | |
3fbb51c1 JA |
4509 | if (unlikely(req->ctx->flags & (IORING_SETUP_IOPOLL|IORING_SETUP_SQPOLL))) |
4510 | return -EINVAL; | |
4511 | if (sqe->ioprio || sqe->len || sqe->buf_index || sqe->rw_flags) | |
4512 | return -EINVAL; | |
4513 | ||
3529d8c2 JA |
4514 | conn->addr = u64_to_user_ptr(READ_ONCE(sqe->addr)); |
4515 | conn->addr_len = READ_ONCE(sqe->addr2); | |
4516 | ||
4517 | if (!io) | |
4518 | return 0; | |
4519 | ||
4520 | return move_addr_to_kernel(conn->addr, conn->addr_len, | |
3fbb51c1 | 4521 | &io->connect.address); |
f499a021 JA |
4522 | } |
4523 | ||
229a7b63 JA |
4524 | static int io_connect(struct io_kiocb *req, bool force_nonblock, |
4525 | struct io_comp_state *cs) | |
f8e85cf2 | 4526 | { |
f499a021 | 4527 | struct io_async_ctx __io, *io; |
f8e85cf2 | 4528 | unsigned file_flags; |
3fbb51c1 | 4529 | int ret; |
f8e85cf2 | 4530 | |
f499a021 JA |
4531 | if (req->io) { |
4532 | io = req->io; | |
4533 | } else { | |
3529d8c2 JA |
4534 | ret = move_addr_to_kernel(req->connect.addr, |
4535 | req->connect.addr_len, | |
4536 | &__io.connect.address); | |
f499a021 JA |
4537 | if (ret) |
4538 | goto out; | |
4539 | io = &__io; | |
4540 | } | |
4541 | ||
3fbb51c1 JA |
4542 | file_flags = force_nonblock ? O_NONBLOCK : 0; |
4543 | ||
4544 | ret = __sys_connect_file(req->file, &io->connect.address, | |
4545 | req->connect.addr_len, file_flags); | |
87f80d62 | 4546 | if ((ret == -EAGAIN || ret == -EINPROGRESS) && force_nonblock) { |
b7bb4f7d JA |
4547 | if (req->io) |
4548 | return -EAGAIN; | |
4549 | if (io_alloc_async_ctx(req)) { | |
f499a021 JA |
4550 | ret = -ENOMEM; |
4551 | goto out; | |
4552 | } | |
b7bb4f7d | 4553 | memcpy(&req->io->connect, &__io.connect, sizeof(__io.connect)); |
f8e85cf2 | 4554 | return -EAGAIN; |
f499a021 | 4555 | } |
f8e85cf2 JA |
4556 | if (ret == -ERESTARTSYS) |
4557 | ret = -EINTR; | |
f499a021 | 4558 | out: |
4e88d6e7 JA |
4559 | if (ret < 0) |
4560 | req_set_fail_links(req); | |
229a7b63 | 4561 | __io_req_complete(req, ret, 0, cs); |
f8e85cf2 | 4562 | return 0; |
469956e8 Y |
4563 | } |
4564 | #else /* !CONFIG_NET */ | |
4565 | static int io_sendmsg_prep(struct io_kiocb *req, const struct io_uring_sqe *sqe) | |
4566 | { | |
f8e85cf2 | 4567 | return -EOPNOTSUPP; |
f8e85cf2 JA |
4568 | } |
4569 | ||
1e16c2f9 RD |
4570 | static int io_sendmsg(struct io_kiocb *req, bool force_nonblock, |
4571 | struct io_comp_state *cs) | |
469956e8 Y |
4572 | { |
4573 | return -EOPNOTSUPP; | |
4574 | } | |
4575 | ||
1e16c2f9 RD |
4576 | static int io_send(struct io_kiocb *req, bool force_nonblock, |
4577 | struct io_comp_state *cs) | |
469956e8 Y |
4578 | { |
4579 | return -EOPNOTSUPP; | |
4580 | } | |
4581 | ||
4582 | static int io_recvmsg_prep(struct io_kiocb *req, | |
4583 | const struct io_uring_sqe *sqe) | |
4584 | { | |
4585 | return -EOPNOTSUPP; | |
4586 | } | |
4587 | ||
1e16c2f9 RD |
4588 | static int io_recvmsg(struct io_kiocb *req, bool force_nonblock, |
4589 | struct io_comp_state *cs) | |
469956e8 Y |
4590 | { |
4591 | return -EOPNOTSUPP; | |
4592 | } | |
4593 | ||
1e16c2f9 RD |
4594 | static int io_recv(struct io_kiocb *req, bool force_nonblock, |
4595 | struct io_comp_state *cs) | |
469956e8 Y |
4596 | { |
4597 | return -EOPNOTSUPP; | |
4598 | } | |
4599 | ||
4600 | static int io_accept_prep(struct io_kiocb *req, const struct io_uring_sqe *sqe) | |
4601 | { | |
4602 | return -EOPNOTSUPP; | |
4603 | } | |
4604 | ||
1e16c2f9 RD |
4605 | static int io_accept(struct io_kiocb *req, bool force_nonblock, |
4606 | struct io_comp_state *cs) | |
469956e8 Y |
4607 | { |
4608 | return -EOPNOTSUPP; | |
4609 | } | |
ce593a6c | 4610 | |
469956e8 Y |
4611 | static int io_connect_prep(struct io_kiocb *req, const struct io_uring_sqe *sqe) |
4612 | { | |
4613 | return -EOPNOTSUPP; | |
4614 | } | |
4615 | ||
1e16c2f9 RD |
4616 | static int io_connect(struct io_kiocb *req, bool force_nonblock, |
4617 | struct io_comp_state *cs) | |
469956e8 | 4618 | { |
f8e85cf2 | 4619 | return -EOPNOTSUPP; |
ce593a6c | 4620 | } |
469956e8 | 4621 | #endif /* CONFIG_NET */ |
f8e85cf2 | 4622 | |
d7718a9d JA |
4623 | struct io_poll_table { |
4624 | struct poll_table_struct pt; | |
4625 | struct io_kiocb *req; | |
4626 | int error; | |
4627 | }; | |
ce593a6c | 4628 | |
d7718a9d JA |
4629 | static int __io_async_wake(struct io_kiocb *req, struct io_poll_iocb *poll, |
4630 | __poll_t mask, task_work_func_t func) | |
4631 | { | |
fd7d6de2 | 4632 | bool twa_signal_ok; |
aa96bf8a | 4633 | int ret; |
d7718a9d JA |
4634 | |
4635 | /* for instances that support it check for an event match first: */ | |
4636 | if (mask && !(mask & poll->events)) | |
4637 | return 0; | |
4638 | ||
4639 | trace_io_uring_task_add(req->ctx, req->opcode, req->user_data, mask); | |
4640 | ||
4641 | list_del_init(&poll->wait.entry); | |
4642 | ||
d7718a9d JA |
4643 | req->result = mask; |
4644 | init_task_work(&req->task_work, func); | |
6d816e08 JA |
4645 | percpu_ref_get(&req->ctx->refs); |
4646 | ||
fd7d6de2 JA |
4647 | /* |
4648 | * If we using the signalfd wait_queue_head for this wakeup, then | |
4649 | * it's not safe to use TWA_SIGNAL as we could be recursing on the | |
4650 | * tsk->sighand->siglock on doing the wakeup. Should not be needed | |
4651 | * either, as the normal wakeup will suffice. | |
4652 | */ | |
4653 | twa_signal_ok = (poll->head != &req->task->sighand->signalfd_wqh); | |
4654 | ||
d7718a9d | 4655 | /* |
e3aabf95 JA |
4656 | * If this fails, then the task is exiting. When a task exits, the |
4657 | * work gets canceled, so just cancel this request as well instead | |
4658 | * of executing it. We can't safely execute it anyway, as we may not | |
4659 | * have the needed state needed for it anyway. | |
d7718a9d | 4660 | */ |
fd7d6de2 | 4661 | ret = io_req_task_work_add(req, &req->task_work, twa_signal_ok); |
aa96bf8a | 4662 | if (unlikely(ret)) { |
c2c4c83c JA |
4663 | struct task_struct *tsk; |
4664 | ||
e3aabf95 | 4665 | WRITE_ONCE(poll->canceled, true); |
aa96bf8a | 4666 | tsk = io_wq_get_task(req->ctx->io_wq); |
ce593a6c JA |
4667 | task_work_add(tsk, &req->task_work, 0); |
4668 | wake_up_process(tsk); | |
aa96bf8a | 4669 | } |
d7718a9d JA |
4670 | return 1; |
4671 | } | |
4672 | ||
74ce6ce4 JA |
4673 | static bool io_poll_rewait(struct io_kiocb *req, struct io_poll_iocb *poll) |
4674 | __acquires(&req->ctx->completion_lock) | |
4675 | { | |
4676 | struct io_ring_ctx *ctx = req->ctx; | |
4677 | ||
4678 | if (!req->result && !READ_ONCE(poll->canceled)) { | |
4679 | struct poll_table_struct pt = { ._key = poll->events }; | |
4680 | ||
4681 | req->result = vfs_poll(req->file, &pt) & poll->events; | |
4682 | } | |
4683 | ||
4684 | spin_lock_irq(&ctx->completion_lock); | |
4685 | if (!req->result && !READ_ONCE(poll->canceled)) { | |
4686 | add_wait_queue(poll->head, &poll->wait); | |
4687 | return true; | |
4688 | } | |
4689 | ||
4690 | return false; | |
4691 | } | |
4692 | ||
d4e7cd36 | 4693 | static struct io_poll_iocb *io_poll_get_double(struct io_kiocb *req) |
18bceab1 | 4694 | { |
d4e7cd36 JA |
4695 | /* pure poll stashes this in ->io, poll driven retry elsewhere */ |
4696 | if (req->opcode == IORING_OP_POLL_ADD) | |
4697 | return (struct io_poll_iocb *) req->io; | |
4698 | return req->apoll->double_poll; | |
4699 | } | |
4700 | ||
4701 | static struct io_poll_iocb *io_poll_get_single(struct io_kiocb *req) | |
4702 | { | |
4703 | if (req->opcode == IORING_OP_POLL_ADD) | |
4704 | return &req->poll; | |
4705 | return &req->apoll->poll; | |
4706 | } | |
4707 | ||
4708 | static void io_poll_remove_double(struct io_kiocb *req) | |
4709 | { | |
4710 | struct io_poll_iocb *poll = io_poll_get_double(req); | |
18bceab1 JA |
4711 | |
4712 | lockdep_assert_held(&req->ctx->completion_lock); | |
4713 | ||
4714 | if (poll && poll->head) { | |
4715 | struct wait_queue_head *head = poll->head; | |
4716 | ||
4717 | spin_lock(&head->lock); | |
4718 | list_del_init(&poll->wait.entry); | |
4719 | if (poll->wait.private) | |
4720 | refcount_dec(&req->refs); | |
4721 | poll->head = NULL; | |
4722 | spin_unlock(&head->lock); | |
4723 | } | |
4724 | } | |
4725 | ||
4726 | static void io_poll_complete(struct io_kiocb *req, __poll_t mask, int error) | |
4727 | { | |
4728 | struct io_ring_ctx *ctx = req->ctx; | |
4729 | ||
d4e7cd36 | 4730 | io_poll_remove_double(req); |
18bceab1 JA |
4731 | req->poll.done = true; |
4732 | io_cqring_fill_event(req, error ? error : mangle_poll(mask)); | |
4733 | io_commit_cqring(ctx); | |
4734 | } | |
4735 | ||
4736 | static void io_poll_task_handler(struct io_kiocb *req, struct io_kiocb **nxt) | |
4737 | { | |
4738 | struct io_ring_ctx *ctx = req->ctx; | |
4739 | ||
4740 | if (io_poll_rewait(req, &req->poll)) { | |
4741 | spin_unlock_irq(&ctx->completion_lock); | |
4742 | return; | |
4743 | } | |
4744 | ||
4745 | hash_del(&req->hash_node); | |
4746 | io_poll_complete(req, req->result, 0); | |
4747 | req->flags |= REQ_F_COMP_LOCKED; | |
9b5f7bd9 | 4748 | *nxt = io_put_req_find_next(req); |
18bceab1 JA |
4749 | spin_unlock_irq(&ctx->completion_lock); |
4750 | ||
4751 | io_cqring_ev_posted(ctx); | |
4752 | } | |
4753 | ||
4754 | static void io_poll_task_func(struct callback_head *cb) | |
4755 | { | |
4756 | struct io_kiocb *req = container_of(cb, struct io_kiocb, task_work); | |
6d816e08 | 4757 | struct io_ring_ctx *ctx = req->ctx; |
18bceab1 JA |
4758 | struct io_kiocb *nxt = NULL; |
4759 | ||
4760 | io_poll_task_handler(req, &nxt); | |
ea1164e5 PB |
4761 | if (nxt) |
4762 | __io_req_task_submit(nxt); | |
6d816e08 | 4763 | percpu_ref_put(&ctx->refs); |
18bceab1 JA |
4764 | } |
4765 | ||
4766 | static int io_poll_double_wake(struct wait_queue_entry *wait, unsigned mode, | |
4767 | int sync, void *key) | |
4768 | { | |
4769 | struct io_kiocb *req = wait->private; | |
d4e7cd36 | 4770 | struct io_poll_iocb *poll = io_poll_get_single(req); |
18bceab1 JA |
4771 | __poll_t mask = key_to_poll(key); |
4772 | ||
4773 | /* for instances that support it check for an event match first: */ | |
4774 | if (mask && !(mask & poll->events)) | |
4775 | return 0; | |
4776 | ||
8706e04e JA |
4777 | list_del_init(&wait->entry); |
4778 | ||
807abcb0 | 4779 | if (poll && poll->head) { |
18bceab1 JA |
4780 | bool done; |
4781 | ||
807abcb0 JA |
4782 | spin_lock(&poll->head->lock); |
4783 | done = list_empty(&poll->wait.entry); | |
18bceab1 | 4784 | if (!done) |
807abcb0 | 4785 | list_del_init(&poll->wait.entry); |
d4e7cd36 JA |
4786 | /* make sure double remove sees this as being gone */ |
4787 | wait->private = NULL; | |
807abcb0 | 4788 | spin_unlock(&poll->head->lock); |
18bceab1 JA |
4789 | if (!done) |
4790 | __io_async_wake(req, poll, mask, io_poll_task_func); | |
4791 | } | |
4792 | refcount_dec(&req->refs); | |
4793 | return 1; | |
4794 | } | |
4795 | ||
4796 | static void io_init_poll_iocb(struct io_poll_iocb *poll, __poll_t events, | |
4797 | wait_queue_func_t wake_func) | |
4798 | { | |
4799 | poll->head = NULL; | |
4800 | poll->done = false; | |
4801 | poll->canceled = false; | |
4802 | poll->events = events; | |
4803 | INIT_LIST_HEAD(&poll->wait.entry); | |
4804 | init_waitqueue_func_entry(&poll->wait, wake_func); | |
4805 | } | |
4806 | ||
4807 | static void __io_queue_proc(struct io_poll_iocb *poll, struct io_poll_table *pt, | |
807abcb0 JA |
4808 | struct wait_queue_head *head, |
4809 | struct io_poll_iocb **poll_ptr) | |
18bceab1 JA |
4810 | { |
4811 | struct io_kiocb *req = pt->req; | |
4812 | ||
4813 | /* | |
4814 | * If poll->head is already set, it's because the file being polled | |
4815 | * uses multiple waitqueues for poll handling (eg one for read, one | |
4816 | * for write). Setup a separate io_poll_iocb if this happens. | |
4817 | */ | |
4818 | if (unlikely(poll->head)) { | |
4819 | /* already have a 2nd entry, fail a third attempt */ | |
807abcb0 | 4820 | if (*poll_ptr) { |
18bceab1 JA |
4821 | pt->error = -EINVAL; |
4822 | return; | |
4823 | } | |
4824 | poll = kmalloc(sizeof(*poll), GFP_ATOMIC); | |
4825 | if (!poll) { | |
4826 | pt->error = -ENOMEM; | |
4827 | return; | |
4828 | } | |
4829 | io_init_poll_iocb(poll, req->poll.events, io_poll_double_wake); | |
4830 | refcount_inc(&req->refs); | |
4831 | poll->wait.private = req; | |
807abcb0 | 4832 | *poll_ptr = poll; |
18bceab1 JA |
4833 | } |
4834 | ||
4835 | pt->error = 0; | |
4836 | poll->head = head; | |
a31eb4a2 JX |
4837 | |
4838 | if (poll->events & EPOLLEXCLUSIVE) | |
4839 | add_wait_queue_exclusive(head, &poll->wait); | |
4840 | else | |
4841 | add_wait_queue(head, &poll->wait); | |
18bceab1 JA |
4842 | } |
4843 | ||
4844 | static void io_async_queue_proc(struct file *file, struct wait_queue_head *head, | |
4845 | struct poll_table_struct *p) | |
4846 | { | |
4847 | struct io_poll_table *pt = container_of(p, struct io_poll_table, pt); | |
807abcb0 | 4848 | struct async_poll *apoll = pt->req->apoll; |
18bceab1 | 4849 | |
807abcb0 | 4850 | __io_queue_proc(&apoll->poll, pt, head, &apoll->double_poll); |
18bceab1 JA |
4851 | } |
4852 | ||
d7718a9d JA |
4853 | static void io_async_task_func(struct callback_head *cb) |
4854 | { | |
4855 | struct io_kiocb *req = container_of(cb, struct io_kiocb, task_work); | |
4856 | struct async_poll *apoll = req->apoll; | |
4857 | struct io_ring_ctx *ctx = req->ctx; | |
4858 | ||
4859 | trace_io_uring_task_run(req->ctx, req->opcode, req->user_data); | |
4860 | ||
74ce6ce4 | 4861 | if (io_poll_rewait(req, &apoll->poll)) { |
d7718a9d | 4862 | spin_unlock_irq(&ctx->completion_lock); |
6d816e08 | 4863 | percpu_ref_put(&ctx->refs); |
74ce6ce4 | 4864 | return; |
d7718a9d JA |
4865 | } |
4866 | ||
31067255 | 4867 | /* If req is still hashed, it cannot have been canceled. Don't check. */ |
0be0b0e3 | 4868 | if (hash_hashed(&req->hash_node)) |
74ce6ce4 | 4869 | hash_del(&req->hash_node); |
2bae047e | 4870 | |
d4e7cd36 | 4871 | io_poll_remove_double(req); |
74ce6ce4 JA |
4872 | spin_unlock_irq(&ctx->completion_lock); |
4873 | ||
0be0b0e3 PB |
4874 | if (!READ_ONCE(apoll->poll.canceled)) |
4875 | __io_req_task_submit(req); | |
4876 | else | |
4877 | __io_req_task_cancel(req, -ECANCELED); | |
aa340845 | 4878 | |
6d816e08 | 4879 | percpu_ref_put(&ctx->refs); |
807abcb0 | 4880 | kfree(apoll->double_poll); |
31067255 | 4881 | kfree(apoll); |
d7718a9d JA |
4882 | } |
4883 | ||
4884 | static int io_async_wake(struct wait_queue_entry *wait, unsigned mode, int sync, | |
4885 | void *key) | |
4886 | { | |
4887 | struct io_kiocb *req = wait->private; | |
4888 | struct io_poll_iocb *poll = &req->apoll->poll; | |
4889 | ||
4890 | trace_io_uring_poll_wake(req->ctx, req->opcode, req->user_data, | |
4891 | key_to_poll(key)); | |
4892 | ||
4893 | return __io_async_wake(req, poll, key_to_poll(key), io_async_task_func); | |
4894 | } | |
4895 | ||
4896 | static void io_poll_req_insert(struct io_kiocb *req) | |
4897 | { | |
4898 | struct io_ring_ctx *ctx = req->ctx; | |
4899 | struct hlist_head *list; | |
4900 | ||
4901 | list = &ctx->cancel_hash[hash_long(req->user_data, ctx->cancel_hash_bits)]; | |
4902 | hlist_add_head(&req->hash_node, list); | |
4903 | } | |
4904 | ||
4905 | static __poll_t __io_arm_poll_handler(struct io_kiocb *req, | |
4906 | struct io_poll_iocb *poll, | |
4907 | struct io_poll_table *ipt, __poll_t mask, | |
4908 | wait_queue_func_t wake_func) | |
4909 | __acquires(&ctx->completion_lock) | |
4910 | { | |
4911 | struct io_ring_ctx *ctx = req->ctx; | |
4912 | bool cancel = false; | |
4913 | ||
18bceab1 | 4914 | io_init_poll_iocb(poll, mask, wake_func); |
b90cd197 | 4915 | poll->file = req->file; |
18bceab1 | 4916 | poll->wait.private = req; |
d7718a9d JA |
4917 | |
4918 | ipt->pt._key = mask; | |
4919 | ipt->req = req; | |
4920 | ipt->error = -EINVAL; | |
4921 | ||
d7718a9d JA |
4922 | mask = vfs_poll(req->file, &ipt->pt) & poll->events; |
4923 | ||
4924 | spin_lock_irq(&ctx->completion_lock); | |
4925 | if (likely(poll->head)) { | |
4926 | spin_lock(&poll->head->lock); | |
4927 | if (unlikely(list_empty(&poll->wait.entry))) { | |
4928 | if (ipt->error) | |
4929 | cancel = true; | |
4930 | ipt->error = 0; | |
4931 | mask = 0; | |
4932 | } | |
4933 | if (mask || ipt->error) | |
4934 | list_del_init(&poll->wait.entry); | |
4935 | else if (cancel) | |
4936 | WRITE_ONCE(poll->canceled, true); | |
4937 | else if (!poll->done) /* actually waiting for an event */ | |
4938 | io_poll_req_insert(req); | |
4939 | spin_unlock(&poll->head->lock); | |
4940 | } | |
4941 | ||
4942 | return mask; | |
4943 | } | |
4944 | ||
4945 | static bool io_arm_poll_handler(struct io_kiocb *req) | |
4946 | { | |
4947 | const struct io_op_def *def = &io_op_defs[req->opcode]; | |
4948 | struct io_ring_ctx *ctx = req->ctx; | |
4949 | struct async_poll *apoll; | |
4950 | struct io_poll_table ipt; | |
4951 | __poll_t mask, ret; | |
9dab14b8 | 4952 | int rw; |
d7718a9d JA |
4953 | |
4954 | if (!req->file || !file_can_poll(req->file)) | |
4955 | return false; | |
24c74678 | 4956 | if (req->flags & REQ_F_POLLED) |
d7718a9d | 4957 | return false; |
9dab14b8 JA |
4958 | if (def->pollin) |
4959 | rw = READ; | |
4960 | else if (def->pollout) | |
4961 | rw = WRITE; | |
4962 | else | |
4963 | return false; | |
4964 | /* if we can't nonblock try, then no point in arming a poll handler */ | |
4965 | if (!io_file_supports_async(req->file, rw)) | |
d7718a9d JA |
4966 | return false; |
4967 | ||
4968 | apoll = kmalloc(sizeof(*apoll), GFP_ATOMIC); | |
4969 | if (unlikely(!apoll)) | |
4970 | return false; | |
807abcb0 | 4971 | apoll->double_poll = NULL; |
d7718a9d JA |
4972 | |
4973 | req->flags |= REQ_F_POLLED; | |
d7718a9d JA |
4974 | req->apoll = apoll; |
4975 | INIT_HLIST_NODE(&req->hash_node); | |
4976 | ||
8755d97a | 4977 | mask = 0; |
d7718a9d | 4978 | if (def->pollin) |
8755d97a | 4979 | mask |= POLLIN | POLLRDNORM; |
d7718a9d JA |
4980 | if (def->pollout) |
4981 | mask |= POLLOUT | POLLWRNORM; | |
4982 | mask |= POLLERR | POLLPRI; | |
4983 | ||
4984 | ipt.pt._qproc = io_async_queue_proc; | |
4985 | ||
4986 | ret = __io_arm_poll_handler(req, &apoll->poll, &ipt, mask, | |
4987 | io_async_wake); | |
a36da65c | 4988 | if (ret || ipt.error) { |
d4e7cd36 | 4989 | io_poll_remove_double(req); |
d7718a9d | 4990 | spin_unlock_irq(&ctx->completion_lock); |
807abcb0 | 4991 | kfree(apoll->double_poll); |
d7718a9d JA |
4992 | kfree(apoll); |
4993 | return false; | |
4994 | } | |
4995 | spin_unlock_irq(&ctx->completion_lock); | |
4996 | trace_io_uring_poll_arm(ctx, req->opcode, req->user_data, mask, | |
4997 | apoll->poll.events); | |
4998 | return true; | |
4999 | } | |
5000 | ||
5001 | static bool __io_poll_remove_one(struct io_kiocb *req, | |
5002 | struct io_poll_iocb *poll) | |
221c5eb2 | 5003 | { |
b41e9852 | 5004 | bool do_complete = false; |
221c5eb2 JA |
5005 | |
5006 | spin_lock(&poll->head->lock); | |
5007 | WRITE_ONCE(poll->canceled, true); | |
392edb45 JA |
5008 | if (!list_empty(&poll->wait.entry)) { |
5009 | list_del_init(&poll->wait.entry); | |
b41e9852 | 5010 | do_complete = true; |
221c5eb2 JA |
5011 | } |
5012 | spin_unlock(&poll->head->lock); | |
3bfa5bcb | 5013 | hash_del(&req->hash_node); |
d7718a9d JA |
5014 | return do_complete; |
5015 | } | |
5016 | ||
5017 | static bool io_poll_remove_one(struct io_kiocb *req) | |
5018 | { | |
5019 | bool do_complete; | |
5020 | ||
d4e7cd36 JA |
5021 | io_poll_remove_double(req); |
5022 | ||
d7718a9d JA |
5023 | if (req->opcode == IORING_OP_POLL_ADD) { |
5024 | do_complete = __io_poll_remove_one(req, &req->poll); | |
5025 | } else { | |
3bfa5bcb JA |
5026 | struct async_poll *apoll = req->apoll; |
5027 | ||
d7718a9d | 5028 | /* non-poll requests have submit ref still */ |
3bfa5bcb JA |
5029 | do_complete = __io_poll_remove_one(req, &apoll->poll); |
5030 | if (do_complete) { | |
d7718a9d | 5031 | io_put_req(req); |
807abcb0 | 5032 | kfree(apoll->double_poll); |
3bfa5bcb JA |
5033 | kfree(apoll); |
5034 | } | |
b1f573bd XW |
5035 | } |
5036 | ||
b41e9852 JA |
5037 | if (do_complete) { |
5038 | io_cqring_fill_event(req, -ECANCELED); | |
5039 | io_commit_cqring(req->ctx); | |
5040 | req->flags |= REQ_F_COMP_LOCKED; | |
f254ac04 | 5041 | req_set_fail_links(req); |
b41e9852 JA |
5042 | io_put_req(req); |
5043 | } | |
5044 | ||
5045 | return do_complete; | |
221c5eb2 JA |
5046 | } |
5047 | ||
76e1b642 JA |
5048 | /* |
5049 | * Returns true if we found and killed one or more poll requests | |
5050 | */ | |
5051 | static bool io_poll_remove_all(struct io_ring_ctx *ctx, struct task_struct *tsk) | |
221c5eb2 | 5052 | { |
78076bb6 | 5053 | struct hlist_node *tmp; |
221c5eb2 | 5054 | struct io_kiocb *req; |
8e2e1faf | 5055 | int posted = 0, i; |
221c5eb2 JA |
5056 | |
5057 | spin_lock_irq(&ctx->completion_lock); | |
78076bb6 JA |
5058 | for (i = 0; i < (1U << ctx->cancel_hash_bits); i++) { |
5059 | struct hlist_head *list; | |
5060 | ||
5061 | list = &ctx->cancel_hash[i]; | |
f3606e3a JA |
5062 | hlist_for_each_entry_safe(req, tmp, list, hash_node) { |
5063 | if (io_task_match(req, tsk)) | |
5064 | posted += io_poll_remove_one(req); | |
5065 | } | |
221c5eb2 JA |
5066 | } |
5067 | spin_unlock_irq(&ctx->completion_lock); | |
b41e9852 | 5068 | |
8e2e1faf JA |
5069 | if (posted) |
5070 | io_cqring_ev_posted(ctx); | |
76e1b642 JA |
5071 | |
5072 | return posted != 0; | |
221c5eb2 JA |
5073 | } |
5074 | ||
47f46768 JA |
5075 | static int io_poll_cancel(struct io_ring_ctx *ctx, __u64 sqe_addr) |
5076 | { | |
78076bb6 | 5077 | struct hlist_head *list; |
47f46768 JA |
5078 | struct io_kiocb *req; |
5079 | ||
78076bb6 JA |
5080 | list = &ctx->cancel_hash[hash_long(sqe_addr, ctx->cancel_hash_bits)]; |
5081 | hlist_for_each_entry(req, list, hash_node) { | |
b41e9852 JA |
5082 | if (sqe_addr != req->user_data) |
5083 | continue; | |
5084 | if (io_poll_remove_one(req)) | |
eac406c6 | 5085 | return 0; |
b41e9852 | 5086 | return -EALREADY; |
47f46768 JA |
5087 | } |
5088 | ||
5089 | return -ENOENT; | |
5090 | } | |
5091 | ||
3529d8c2 JA |
5092 | static int io_poll_remove_prep(struct io_kiocb *req, |
5093 | const struct io_uring_sqe *sqe) | |
0969e783 | 5094 | { |
0969e783 JA |
5095 | if (unlikely(req->ctx->flags & IORING_SETUP_IOPOLL)) |
5096 | return -EINVAL; | |
5097 | if (sqe->ioprio || sqe->off || sqe->len || sqe->buf_index || | |
5098 | sqe->poll_events) | |
5099 | return -EINVAL; | |
5100 | ||
5101 | req->poll.addr = READ_ONCE(sqe->addr); | |
0969e783 JA |
5102 | return 0; |
5103 | } | |
5104 | ||
221c5eb2 JA |
5105 | /* |
5106 | * Find a running poll command that matches one specified in sqe->addr, | |
5107 | * and remove it if found. | |
5108 | */ | |
fc4df999 | 5109 | static int io_poll_remove(struct io_kiocb *req) |
221c5eb2 JA |
5110 | { |
5111 | struct io_ring_ctx *ctx = req->ctx; | |
0969e783 | 5112 | u64 addr; |
47f46768 | 5113 | int ret; |
221c5eb2 | 5114 | |
0969e783 | 5115 | addr = req->poll.addr; |
221c5eb2 | 5116 | spin_lock_irq(&ctx->completion_lock); |
0969e783 | 5117 | ret = io_poll_cancel(ctx, addr); |
221c5eb2 JA |
5118 | spin_unlock_irq(&ctx->completion_lock); |
5119 | ||
4e88d6e7 JA |
5120 | if (ret < 0) |
5121 | req_set_fail_links(req); | |
e1e16097 | 5122 | io_req_complete(req, ret); |
221c5eb2 JA |
5123 | return 0; |
5124 | } | |
5125 | ||
221c5eb2 JA |
5126 | static int io_poll_wake(struct wait_queue_entry *wait, unsigned mode, int sync, |
5127 | void *key) | |
5128 | { | |
c2f2eb7d JA |
5129 | struct io_kiocb *req = wait->private; |
5130 | struct io_poll_iocb *poll = &req->poll; | |
221c5eb2 | 5131 | |
d7718a9d | 5132 | return __io_async_wake(req, poll, key_to_poll(key), io_poll_task_func); |
221c5eb2 JA |
5133 | } |
5134 | ||
221c5eb2 JA |
5135 | static void io_poll_queue_proc(struct file *file, struct wait_queue_head *head, |
5136 | struct poll_table_struct *p) | |
5137 | { | |
5138 | struct io_poll_table *pt = container_of(p, struct io_poll_table, pt); | |
5139 | ||
807abcb0 | 5140 | __io_queue_proc(&pt->req->poll, pt, head, (struct io_poll_iocb **) &pt->req->io); |
eac406c6 JA |
5141 | } |
5142 | ||
3529d8c2 | 5143 | static int io_poll_add_prep(struct io_kiocb *req, const struct io_uring_sqe *sqe) |
221c5eb2 JA |
5144 | { |
5145 | struct io_poll_iocb *poll = &req->poll; | |
5769a351 | 5146 | u32 events; |
221c5eb2 JA |
5147 | |
5148 | if (unlikely(req->ctx->flags & IORING_SETUP_IOPOLL)) | |
5149 | return -EINVAL; | |
5150 | if (sqe->addr || sqe->ioprio || sqe->off || sqe->len || sqe->buf_index) | |
5151 | return -EINVAL; | |
09bb8394 JA |
5152 | if (!poll->file) |
5153 | return -EBADF; | |
221c5eb2 | 5154 | |
5769a351 JX |
5155 | events = READ_ONCE(sqe->poll32_events); |
5156 | #ifdef __BIG_ENDIAN | |
5157 | events = swahw32(events); | |
5158 | #endif | |
a31eb4a2 JX |
5159 | poll->events = demangle_poll(events) | EPOLLERR | EPOLLHUP | |
5160 | (events & EPOLLEXCLUSIVE); | |
0969e783 JA |
5161 | return 0; |
5162 | } | |
5163 | ||
014db007 | 5164 | static int io_poll_add(struct io_kiocb *req) |
0969e783 JA |
5165 | { |
5166 | struct io_poll_iocb *poll = &req->poll; | |
5167 | struct io_ring_ctx *ctx = req->ctx; | |
5168 | struct io_poll_table ipt; | |
0969e783 | 5169 | __poll_t mask; |
0969e783 | 5170 | |
78076bb6 | 5171 | INIT_HLIST_NODE(&req->hash_node); |
d7718a9d | 5172 | ipt.pt._qproc = io_poll_queue_proc; |
36703247 | 5173 | |
d7718a9d JA |
5174 | mask = __io_arm_poll_handler(req, &req->poll, &ipt, poll->events, |
5175 | io_poll_wake); | |
221c5eb2 | 5176 | |
8c838788 | 5177 | if (mask) { /* no async, we'd stolen it */ |
221c5eb2 | 5178 | ipt.error = 0; |
b0dd8a41 | 5179 | io_poll_complete(req, mask, 0); |
221c5eb2 | 5180 | } |
221c5eb2 JA |
5181 | spin_unlock_irq(&ctx->completion_lock); |
5182 | ||
8c838788 JA |
5183 | if (mask) { |
5184 | io_cqring_ev_posted(ctx); | |
014db007 | 5185 | io_put_req(req); |
221c5eb2 | 5186 | } |
8c838788 | 5187 | return ipt.error; |
221c5eb2 JA |
5188 | } |
5189 | ||
5262f567 JA |
5190 | static enum hrtimer_restart io_timeout_fn(struct hrtimer *timer) |
5191 | { | |
ad8a48ac JA |
5192 | struct io_timeout_data *data = container_of(timer, |
5193 | struct io_timeout_data, timer); | |
5194 | struct io_kiocb *req = data->req; | |
5195 | struct io_ring_ctx *ctx = req->ctx; | |
5262f567 JA |
5196 | unsigned long flags; |
5197 | ||
5262f567 | 5198 | spin_lock_irqsave(&ctx->completion_lock, flags); |
01cec8c1 PB |
5199 | atomic_set(&req->ctx->cq_timeouts, |
5200 | atomic_read(&req->ctx->cq_timeouts) + 1); | |
5201 | ||
ef03681a | 5202 | /* |
11365043 JA |
5203 | * We could be racing with timeout deletion. If the list is empty, |
5204 | * then timeout lookup already found it and will be handling it. | |
ef03681a | 5205 | */ |
135fcde8 PB |
5206 | if (!list_empty(&req->timeout.list)) |
5207 | list_del_init(&req->timeout.list); | |
5262f567 | 5208 | |
78e19bbe | 5209 | io_cqring_fill_event(req, -ETIME); |
5262f567 JA |
5210 | io_commit_cqring(ctx); |
5211 | spin_unlock_irqrestore(&ctx->completion_lock, flags); | |
5212 | ||
5213 | io_cqring_ev_posted(ctx); | |
4e88d6e7 | 5214 | req_set_fail_links(req); |
5262f567 JA |
5215 | io_put_req(req); |
5216 | return HRTIMER_NORESTART; | |
5217 | } | |
5218 | ||
f254ac04 JA |
5219 | static int __io_timeout_cancel(struct io_kiocb *req) |
5220 | { | |
5221 | int ret; | |
5222 | ||
5223 | list_del_init(&req->timeout.list); | |
5224 | ||
5225 | ret = hrtimer_try_to_cancel(&req->io->timeout.timer); | |
5226 | if (ret == -1) | |
5227 | return -EALREADY; | |
5228 | ||
5229 | req_set_fail_links(req); | |
5230 | req->flags |= REQ_F_COMP_LOCKED; | |
5231 | io_cqring_fill_event(req, -ECANCELED); | |
5232 | io_put_req(req); | |
5233 | return 0; | |
5234 | } | |
5235 | ||
47f46768 JA |
5236 | static int io_timeout_cancel(struct io_ring_ctx *ctx, __u64 user_data) |
5237 | { | |
5238 | struct io_kiocb *req; | |
5239 | int ret = -ENOENT; | |
5240 | ||
135fcde8 | 5241 | list_for_each_entry(req, &ctx->timeout_list, timeout.list) { |
47f46768 | 5242 | if (user_data == req->user_data) { |
47f46768 JA |
5243 | ret = 0; |
5244 | break; | |
5245 | } | |
5246 | } | |
5247 | ||
5248 | if (ret == -ENOENT) | |
5249 | return ret; | |
5250 | ||
f254ac04 | 5251 | return __io_timeout_cancel(req); |
47f46768 JA |
5252 | } |
5253 | ||
3529d8c2 JA |
5254 | static int io_timeout_remove_prep(struct io_kiocb *req, |
5255 | const struct io_uring_sqe *sqe) | |
b29472ee | 5256 | { |
b29472ee JA |
5257 | if (unlikely(req->ctx->flags & IORING_SETUP_IOPOLL)) |
5258 | return -EINVAL; | |
61710e43 DA |
5259 | if (unlikely(req->flags & (REQ_F_FIXED_FILE | REQ_F_BUFFER_SELECT))) |
5260 | return -EINVAL; | |
5261 | if (sqe->ioprio || sqe->buf_index || sqe->len) | |
b29472ee JA |
5262 | return -EINVAL; |
5263 | ||
5264 | req->timeout.addr = READ_ONCE(sqe->addr); | |
5265 | req->timeout.flags = READ_ONCE(sqe->timeout_flags); | |
5266 | if (req->timeout.flags) | |
5267 | return -EINVAL; | |
5268 | ||
b29472ee JA |
5269 | return 0; |
5270 | } | |
5271 | ||
11365043 JA |
5272 | /* |
5273 | * Remove or update an existing timeout command | |
5274 | */ | |
fc4df999 | 5275 | static int io_timeout_remove(struct io_kiocb *req) |
11365043 JA |
5276 | { |
5277 | struct io_ring_ctx *ctx = req->ctx; | |
47f46768 | 5278 | int ret; |
11365043 | 5279 | |
11365043 | 5280 | spin_lock_irq(&ctx->completion_lock); |
b29472ee | 5281 | ret = io_timeout_cancel(ctx, req->timeout.addr); |
11365043 | 5282 | |
47f46768 | 5283 | io_cqring_fill_event(req, ret); |
11365043 JA |
5284 | io_commit_cqring(ctx); |
5285 | spin_unlock_irq(&ctx->completion_lock); | |
5262f567 | 5286 | io_cqring_ev_posted(ctx); |
4e88d6e7 JA |
5287 | if (ret < 0) |
5288 | req_set_fail_links(req); | |
ec9c02ad | 5289 | io_put_req(req); |
11365043 | 5290 | return 0; |
5262f567 JA |
5291 | } |
5292 | ||
3529d8c2 | 5293 | static int io_timeout_prep(struct io_kiocb *req, const struct io_uring_sqe *sqe, |
2d28390a | 5294 | bool is_timeout_link) |
5262f567 | 5295 | { |
ad8a48ac | 5296 | struct io_timeout_data *data; |
a41525ab | 5297 | unsigned flags; |
56080b02 | 5298 | u32 off = READ_ONCE(sqe->off); |
5262f567 | 5299 | |
ad8a48ac | 5300 | if (unlikely(req->ctx->flags & IORING_SETUP_IOPOLL)) |
5262f567 | 5301 | return -EINVAL; |
ad8a48ac | 5302 | if (sqe->ioprio || sqe->buf_index || sqe->len != 1) |
a41525ab | 5303 | return -EINVAL; |
56080b02 | 5304 | if (off && is_timeout_link) |
2d28390a | 5305 | return -EINVAL; |
a41525ab JA |
5306 | flags = READ_ONCE(sqe->timeout_flags); |
5307 | if (flags & ~IORING_TIMEOUT_ABS) | |
5262f567 | 5308 | return -EINVAL; |
bdf20073 | 5309 | |
bfe68a22 | 5310 | req->timeout.off = off; |
26a61679 | 5311 | |
3529d8c2 | 5312 | if (!req->io && io_alloc_async_ctx(req)) |
26a61679 JA |
5313 | return -ENOMEM; |
5314 | ||
5315 | data = &req->io->timeout; | |
ad8a48ac | 5316 | data->req = req; |
ad8a48ac JA |
5317 | |
5318 | if (get_timespec64(&data->ts, u64_to_user_ptr(sqe->addr))) | |
5262f567 JA |
5319 | return -EFAULT; |
5320 | ||
11365043 | 5321 | if (flags & IORING_TIMEOUT_ABS) |
ad8a48ac | 5322 | data->mode = HRTIMER_MODE_ABS; |
11365043 | 5323 | else |
ad8a48ac | 5324 | data->mode = HRTIMER_MODE_REL; |
11365043 | 5325 | |
ad8a48ac JA |
5326 | hrtimer_init(&data->timer, CLOCK_MONOTONIC, data->mode); |
5327 | return 0; | |
5328 | } | |
5329 | ||
fc4df999 | 5330 | static int io_timeout(struct io_kiocb *req) |
ad8a48ac | 5331 | { |
ad8a48ac | 5332 | struct io_ring_ctx *ctx = req->ctx; |
bfe68a22 | 5333 | struct io_timeout_data *data = &req->io->timeout; |
ad8a48ac | 5334 | struct list_head *entry; |
bfe68a22 | 5335 | u32 tail, off = req->timeout.off; |
ad8a48ac | 5336 | |
733f5c95 | 5337 | spin_lock_irq(&ctx->completion_lock); |
93bd25bb | 5338 | |
5262f567 JA |
5339 | /* |
5340 | * sqe->off holds how many events that need to occur for this | |
93bd25bb JA |
5341 | * timeout event to be satisfied. If it isn't set, then this is |
5342 | * a pure timeout request, sequence isn't used. | |
5262f567 | 5343 | */ |
8eb7e2d0 | 5344 | if (io_is_timeout_noseq(req)) { |
93bd25bb JA |
5345 | entry = ctx->timeout_list.prev; |
5346 | goto add; | |
5347 | } | |
5262f567 | 5348 | |
bfe68a22 PB |
5349 | tail = ctx->cached_cq_tail - atomic_read(&ctx->cq_timeouts); |
5350 | req->timeout.target_seq = tail + off; | |
5262f567 JA |
5351 | |
5352 | /* | |
5353 | * Insertion sort, ensuring the first entry in the list is always | |
5354 | * the one we need first. | |
5355 | */ | |
5262f567 | 5356 | list_for_each_prev(entry, &ctx->timeout_list) { |
135fcde8 PB |
5357 | struct io_kiocb *nxt = list_entry(entry, struct io_kiocb, |
5358 | timeout.list); | |
5262f567 | 5359 | |
8eb7e2d0 | 5360 | if (io_is_timeout_noseq(nxt)) |
93bd25bb | 5361 | continue; |
bfe68a22 PB |
5362 | /* nxt.seq is behind @tail, otherwise would've been completed */ |
5363 | if (off >= nxt->timeout.target_seq - tail) | |
5262f567 JA |
5364 | break; |
5365 | } | |
93bd25bb | 5366 | add: |
135fcde8 | 5367 | list_add(&req->timeout.list, entry); |
ad8a48ac JA |
5368 | data->timer.function = io_timeout_fn; |
5369 | hrtimer_start(&data->timer, timespec64_to_ktime(data->ts), data->mode); | |
5262f567 | 5370 | spin_unlock_irq(&ctx->completion_lock); |
5262f567 JA |
5371 | return 0; |
5372 | } | |
5262f567 | 5373 | |
62755e35 JA |
5374 | static bool io_cancel_cb(struct io_wq_work *work, void *data) |
5375 | { | |
5376 | struct io_kiocb *req = container_of(work, struct io_kiocb, work); | |
5377 | ||
5378 | return req->user_data == (unsigned long) data; | |
5379 | } | |
5380 | ||
e977d6d3 | 5381 | static int io_async_cancel_one(struct io_ring_ctx *ctx, void *sqe_addr) |
62755e35 | 5382 | { |
62755e35 | 5383 | enum io_wq_cancel cancel_ret; |
62755e35 JA |
5384 | int ret = 0; |
5385 | ||
4f26bda1 | 5386 | cancel_ret = io_wq_cancel_cb(ctx->io_wq, io_cancel_cb, sqe_addr, false); |
62755e35 JA |
5387 | switch (cancel_ret) { |
5388 | case IO_WQ_CANCEL_OK: | |
5389 | ret = 0; | |
5390 | break; | |
5391 | case IO_WQ_CANCEL_RUNNING: | |
5392 | ret = -EALREADY; | |
5393 | break; | |
5394 | case IO_WQ_CANCEL_NOTFOUND: | |
5395 | ret = -ENOENT; | |
5396 | break; | |
5397 | } | |
5398 | ||
e977d6d3 JA |
5399 | return ret; |
5400 | } | |
5401 | ||
47f46768 JA |
5402 | static void io_async_find_and_cancel(struct io_ring_ctx *ctx, |
5403 | struct io_kiocb *req, __u64 sqe_addr, | |
014db007 | 5404 | int success_ret) |
47f46768 JA |
5405 | { |
5406 | unsigned long flags; | |
5407 | int ret; | |
5408 | ||
5409 | ret = io_async_cancel_one(ctx, (void *) (unsigned long) sqe_addr); | |
5410 | if (ret != -ENOENT) { | |
5411 | spin_lock_irqsave(&ctx->completion_lock, flags); | |
5412 | goto done; | |
5413 | } | |
5414 | ||
5415 | spin_lock_irqsave(&ctx->completion_lock, flags); | |
5416 | ret = io_timeout_cancel(ctx, sqe_addr); | |
5417 | if (ret != -ENOENT) | |
5418 | goto done; | |
5419 | ret = io_poll_cancel(ctx, sqe_addr); | |
5420 | done: | |
b0dd8a41 JA |
5421 | if (!ret) |
5422 | ret = success_ret; | |
47f46768 JA |
5423 | io_cqring_fill_event(req, ret); |
5424 | io_commit_cqring(ctx); | |
5425 | spin_unlock_irqrestore(&ctx->completion_lock, flags); | |
5426 | io_cqring_ev_posted(ctx); | |
5427 | ||
4e88d6e7 JA |
5428 | if (ret < 0) |
5429 | req_set_fail_links(req); | |
014db007 | 5430 | io_put_req(req); |
47f46768 JA |
5431 | } |
5432 | ||
3529d8c2 JA |
5433 | static int io_async_cancel_prep(struct io_kiocb *req, |
5434 | const struct io_uring_sqe *sqe) | |
e977d6d3 | 5435 | { |
fbf23849 | 5436 | if (unlikely(req->ctx->flags & IORING_SETUP_IOPOLL)) |
e977d6d3 | 5437 | return -EINVAL; |
61710e43 DA |
5438 | if (unlikely(req->flags & (REQ_F_FIXED_FILE | REQ_F_BUFFER_SELECT))) |
5439 | return -EINVAL; | |
5440 | if (sqe->ioprio || sqe->off || sqe->len || sqe->cancel_flags) | |
e977d6d3 JA |
5441 | return -EINVAL; |
5442 | ||
fbf23849 JA |
5443 | req->cancel.addr = READ_ONCE(sqe->addr); |
5444 | return 0; | |
5445 | } | |
5446 | ||
014db007 | 5447 | static int io_async_cancel(struct io_kiocb *req) |
fbf23849 JA |
5448 | { |
5449 | struct io_ring_ctx *ctx = req->ctx; | |
fbf23849 | 5450 | |
014db007 | 5451 | io_async_find_and_cancel(ctx, req, req->cancel.addr, 0); |
5262f567 JA |
5452 | return 0; |
5453 | } | |
5454 | ||
05f3fb3c JA |
5455 | static int io_files_update_prep(struct io_kiocb *req, |
5456 | const struct io_uring_sqe *sqe) | |
5457 | { | |
6ca56f84 JA |
5458 | if (unlikely(req->ctx->flags & IORING_SETUP_SQPOLL)) |
5459 | return -EINVAL; | |
61710e43 DA |
5460 | if (unlikely(req->flags & (REQ_F_FIXED_FILE | REQ_F_BUFFER_SELECT))) |
5461 | return -EINVAL; | |
5462 | if (sqe->ioprio || sqe->rw_flags) | |
05f3fb3c JA |
5463 | return -EINVAL; |
5464 | ||
5465 | req->files_update.offset = READ_ONCE(sqe->off); | |
5466 | req->files_update.nr_args = READ_ONCE(sqe->len); | |
5467 | if (!req->files_update.nr_args) | |
5468 | return -EINVAL; | |
5469 | req->files_update.arg = READ_ONCE(sqe->addr); | |
5470 | return 0; | |
5471 | } | |
5472 | ||
229a7b63 JA |
5473 | static int io_files_update(struct io_kiocb *req, bool force_nonblock, |
5474 | struct io_comp_state *cs) | |
fbf23849 JA |
5475 | { |
5476 | struct io_ring_ctx *ctx = req->ctx; | |
05f3fb3c JA |
5477 | struct io_uring_files_update up; |
5478 | int ret; | |
fbf23849 | 5479 | |
f86cd20c | 5480 | if (force_nonblock) |
05f3fb3c | 5481 | return -EAGAIN; |
05f3fb3c JA |
5482 | |
5483 | up.offset = req->files_update.offset; | |
5484 | up.fds = req->files_update.arg; | |
5485 | ||
5486 | mutex_lock(&ctx->uring_lock); | |
5487 | ret = __io_sqe_files_update(ctx, &up, req->files_update.nr_args); | |
5488 | mutex_unlock(&ctx->uring_lock); | |
5489 | ||
5490 | if (ret < 0) | |
5491 | req_set_fail_links(req); | |
229a7b63 | 5492 | __io_req_complete(req, ret, 0, cs); |
5262f567 JA |
5493 | return 0; |
5494 | } | |
5495 | ||
3529d8c2 JA |
5496 | static int io_req_defer_prep(struct io_kiocb *req, |
5497 | const struct io_uring_sqe *sqe) | |
f67676d1 | 5498 | { |
e781573e | 5499 | ssize_t ret = 0; |
f67676d1 | 5500 | |
f1d96a8f PB |
5501 | if (!sqe) |
5502 | return 0; | |
5503 | ||
327d6d96 PB |
5504 | if (io_alloc_async_ctx(req)) |
5505 | return -EAGAIN; | |
f56040b8 PB |
5506 | ret = io_prep_work_files(req); |
5507 | if (unlikely(ret)) | |
5508 | return ret; | |
cccf0ee8 | 5509 | |
202700e1 JA |
5510 | io_prep_async_work(req); |
5511 | ||
d625c6ee | 5512 | switch (req->opcode) { |
e781573e JA |
5513 | case IORING_OP_NOP: |
5514 | break; | |
f67676d1 JA |
5515 | case IORING_OP_READV: |
5516 | case IORING_OP_READ_FIXED: | |
3a6820f2 | 5517 | case IORING_OP_READ: |
3529d8c2 | 5518 | ret = io_read_prep(req, sqe, true); |
f67676d1 JA |
5519 | break; |
5520 | case IORING_OP_WRITEV: | |
5521 | case IORING_OP_WRITE_FIXED: | |
3a6820f2 | 5522 | case IORING_OP_WRITE: |
3529d8c2 | 5523 | ret = io_write_prep(req, sqe, true); |
f67676d1 | 5524 | break; |
0969e783 | 5525 | case IORING_OP_POLL_ADD: |
3529d8c2 | 5526 | ret = io_poll_add_prep(req, sqe); |
0969e783 JA |
5527 | break; |
5528 | case IORING_OP_POLL_REMOVE: | |
3529d8c2 | 5529 | ret = io_poll_remove_prep(req, sqe); |
0969e783 | 5530 | break; |
8ed8d3c3 | 5531 | case IORING_OP_FSYNC: |
3529d8c2 | 5532 | ret = io_prep_fsync(req, sqe); |
8ed8d3c3 JA |
5533 | break; |
5534 | case IORING_OP_SYNC_FILE_RANGE: | |
3529d8c2 | 5535 | ret = io_prep_sfr(req, sqe); |
8ed8d3c3 | 5536 | break; |
03b1230c | 5537 | case IORING_OP_SENDMSG: |
fddaface | 5538 | case IORING_OP_SEND: |
3529d8c2 | 5539 | ret = io_sendmsg_prep(req, sqe); |
03b1230c JA |
5540 | break; |
5541 | case IORING_OP_RECVMSG: | |
fddaface | 5542 | case IORING_OP_RECV: |
3529d8c2 | 5543 | ret = io_recvmsg_prep(req, sqe); |
03b1230c | 5544 | break; |
f499a021 | 5545 | case IORING_OP_CONNECT: |
3529d8c2 | 5546 | ret = io_connect_prep(req, sqe); |
f499a021 | 5547 | break; |
2d28390a | 5548 | case IORING_OP_TIMEOUT: |
3529d8c2 | 5549 | ret = io_timeout_prep(req, sqe, false); |
b7bb4f7d | 5550 | break; |
b29472ee | 5551 | case IORING_OP_TIMEOUT_REMOVE: |
3529d8c2 | 5552 | ret = io_timeout_remove_prep(req, sqe); |
b29472ee | 5553 | break; |
fbf23849 | 5554 | case IORING_OP_ASYNC_CANCEL: |
3529d8c2 | 5555 | ret = io_async_cancel_prep(req, sqe); |
fbf23849 | 5556 | break; |
2d28390a | 5557 | case IORING_OP_LINK_TIMEOUT: |
3529d8c2 | 5558 | ret = io_timeout_prep(req, sqe, true); |
b7bb4f7d | 5559 | break; |
8ed8d3c3 | 5560 | case IORING_OP_ACCEPT: |
3529d8c2 | 5561 | ret = io_accept_prep(req, sqe); |
8ed8d3c3 | 5562 | break; |
d63d1b5e JA |
5563 | case IORING_OP_FALLOCATE: |
5564 | ret = io_fallocate_prep(req, sqe); | |
5565 | break; | |
15b71abe JA |
5566 | case IORING_OP_OPENAT: |
5567 | ret = io_openat_prep(req, sqe); | |
5568 | break; | |
b5dba59e JA |
5569 | case IORING_OP_CLOSE: |
5570 | ret = io_close_prep(req, sqe); | |
5571 | break; | |
05f3fb3c JA |
5572 | case IORING_OP_FILES_UPDATE: |
5573 | ret = io_files_update_prep(req, sqe); | |
5574 | break; | |
eddc7ef5 JA |
5575 | case IORING_OP_STATX: |
5576 | ret = io_statx_prep(req, sqe); | |
5577 | break; | |
4840e418 JA |
5578 | case IORING_OP_FADVISE: |
5579 | ret = io_fadvise_prep(req, sqe); | |
5580 | break; | |
c1ca757b JA |
5581 | case IORING_OP_MADVISE: |
5582 | ret = io_madvise_prep(req, sqe); | |
5583 | break; | |
cebdb986 JA |
5584 | case IORING_OP_OPENAT2: |
5585 | ret = io_openat2_prep(req, sqe); | |
5586 | break; | |
3e4827b0 JA |
5587 | case IORING_OP_EPOLL_CTL: |
5588 | ret = io_epoll_ctl_prep(req, sqe); | |
5589 | break; | |
7d67af2c PB |
5590 | case IORING_OP_SPLICE: |
5591 | ret = io_splice_prep(req, sqe); | |
5592 | break; | |
ddf0322d JA |
5593 | case IORING_OP_PROVIDE_BUFFERS: |
5594 | ret = io_provide_buffers_prep(req, sqe); | |
5595 | break; | |
067524e9 JA |
5596 | case IORING_OP_REMOVE_BUFFERS: |
5597 | ret = io_remove_buffers_prep(req, sqe); | |
5598 | break; | |
f2a8d5c7 PB |
5599 | case IORING_OP_TEE: |
5600 | ret = io_tee_prep(req, sqe); | |
5601 | break; | |
f67676d1 | 5602 | default: |
e781573e JA |
5603 | printk_once(KERN_WARNING "io_uring: unhandled opcode %d\n", |
5604 | req->opcode); | |
5605 | ret = -EINVAL; | |
b7bb4f7d | 5606 | break; |
f67676d1 JA |
5607 | } |
5608 | ||
b7bb4f7d | 5609 | return ret; |
f67676d1 JA |
5610 | } |
5611 | ||
9cf7c104 PB |
5612 | static u32 io_get_sequence(struct io_kiocb *req) |
5613 | { | |
5614 | struct io_kiocb *pos; | |
5615 | struct io_ring_ctx *ctx = req->ctx; | |
5616 | u32 total_submitted, nr_reqs = 1; | |
5617 | ||
5618 | if (req->flags & REQ_F_LINK_HEAD) | |
5619 | list_for_each_entry(pos, &req->link_list, link_list) | |
5620 | nr_reqs++; | |
5621 | ||
5622 | total_submitted = ctx->cached_sq_head - ctx->cached_sq_dropped; | |
5623 | return total_submitted - nr_reqs; | |
5624 | } | |
5625 | ||
3529d8c2 | 5626 | static int io_req_defer(struct io_kiocb *req, const struct io_uring_sqe *sqe) |
de0617e4 | 5627 | { |
a197f664 | 5628 | struct io_ring_ctx *ctx = req->ctx; |
27dc8338 | 5629 | struct io_defer_entry *de; |
f67676d1 | 5630 | int ret; |
9cf7c104 | 5631 | u32 seq; |
de0617e4 | 5632 | |
9d858b21 | 5633 | /* Still need defer if there is pending req in defer list. */ |
9cf7c104 PB |
5634 | if (likely(list_empty_careful(&ctx->defer_list) && |
5635 | !(req->flags & REQ_F_IO_DRAIN))) | |
5636 | return 0; | |
5637 | ||
5638 | seq = io_get_sequence(req); | |
5639 | /* Still a chance to pass the sequence check */ | |
5640 | if (!req_need_defer(req, seq) && list_empty_careful(&ctx->defer_list)) | |
de0617e4 JA |
5641 | return 0; |
5642 | ||
650b5481 | 5643 | if (!req->io) { |
650b5481 | 5644 | ret = io_req_defer_prep(req, sqe); |
327d6d96 | 5645 | if (ret) |
650b5481 PB |
5646 | return ret; |
5647 | } | |
cbdcb435 | 5648 | io_prep_async_link(req); |
27dc8338 PB |
5649 | de = kmalloc(sizeof(*de), GFP_KERNEL); |
5650 | if (!de) | |
5651 | return -ENOMEM; | |
2d28390a | 5652 | |
de0617e4 | 5653 | spin_lock_irq(&ctx->completion_lock); |
9cf7c104 | 5654 | if (!req_need_defer(req, seq) && list_empty(&ctx->defer_list)) { |
de0617e4 | 5655 | spin_unlock_irq(&ctx->completion_lock); |
27dc8338 | 5656 | kfree(de); |
ae34817b PB |
5657 | io_queue_async_work(req); |
5658 | return -EIOCBQUEUED; | |
de0617e4 JA |
5659 | } |
5660 | ||
915967f6 | 5661 | trace_io_uring_defer(ctx, req, req->user_data); |
27dc8338 | 5662 | de->req = req; |
9cf7c104 | 5663 | de->seq = seq; |
27dc8338 | 5664 | list_add_tail(&de->list, &ctx->defer_list); |
de0617e4 JA |
5665 | spin_unlock_irq(&ctx->completion_lock); |
5666 | return -EIOCBQUEUED; | |
5667 | } | |
5668 | ||
f573d384 JA |
5669 | static void io_req_drop_files(struct io_kiocb *req) |
5670 | { | |
5671 | struct io_ring_ctx *ctx = req->ctx; | |
5672 | unsigned long flags; | |
5673 | ||
5674 | spin_lock_irqsave(&ctx->inflight_lock, flags); | |
5675 | list_del(&req->inflight_entry); | |
5676 | if (waitqueue_active(&ctx->inflight_wait)) | |
5677 | wake_up(&ctx->inflight_wait); | |
5678 | spin_unlock_irqrestore(&ctx->inflight_lock, flags); | |
5679 | req->flags &= ~REQ_F_INFLIGHT; | |
0f212204 | 5680 | put_files_struct(req->work.files); |
f573d384 JA |
5681 | req->work.files = NULL; |
5682 | } | |
5683 | ||
3ca405eb | 5684 | static void __io_clean_op(struct io_kiocb *req) |
99bc4c38 PB |
5685 | { |
5686 | struct io_async_ctx *io = req->io; | |
5687 | ||
0e1b6fe3 PB |
5688 | if (req->flags & REQ_F_BUFFER_SELECTED) { |
5689 | switch (req->opcode) { | |
5690 | case IORING_OP_READV: | |
5691 | case IORING_OP_READ_FIXED: | |
5692 | case IORING_OP_READ: | |
bcda7baa | 5693 | kfree((void *)(unsigned long)req->rw.addr); |
0e1b6fe3 PB |
5694 | break; |
5695 | case IORING_OP_RECVMSG: | |
5696 | case IORING_OP_RECV: | |
bcda7baa | 5697 | kfree(req->sr_msg.kbuf); |
0e1b6fe3 PB |
5698 | break; |
5699 | } | |
5700 | req->flags &= ~REQ_F_BUFFER_SELECTED; | |
99bc4c38 PB |
5701 | } |
5702 | ||
0e1b6fe3 PB |
5703 | if (req->flags & REQ_F_NEED_CLEANUP) { |
5704 | switch (req->opcode) { | |
5705 | case IORING_OP_READV: | |
5706 | case IORING_OP_READ_FIXED: | |
5707 | case IORING_OP_READ: | |
5708 | case IORING_OP_WRITEV: | |
5709 | case IORING_OP_WRITE_FIXED: | |
5710 | case IORING_OP_WRITE: | |
ff6165b2 JA |
5711 | if (io->rw.free_iovec) |
5712 | kfree(io->rw.free_iovec); | |
0e1b6fe3 PB |
5713 | break; |
5714 | case IORING_OP_RECVMSG: | |
5715 | case IORING_OP_SENDMSG: | |
5716 | if (io->msg.iov != io->msg.fast_iov) | |
5717 | kfree(io->msg.iov); | |
5718 | break; | |
5719 | case IORING_OP_SPLICE: | |
5720 | case IORING_OP_TEE: | |
5721 | io_put_file(req, req->splice.file_in, | |
5722 | (req->splice.flags & SPLICE_F_FD_IN_FIXED)); | |
5723 | break; | |
f3cd4850 JA |
5724 | case IORING_OP_OPENAT: |
5725 | case IORING_OP_OPENAT2: | |
5726 | if (req->open.filename) | |
5727 | putname(req->open.filename); | |
5728 | break; | |
0e1b6fe3 PB |
5729 | } |
5730 | req->flags &= ~REQ_F_NEED_CLEANUP; | |
99bc4c38 | 5731 | } |
bb175342 | 5732 | |
f573d384 JA |
5733 | if (req->flags & REQ_F_INFLIGHT) |
5734 | io_req_drop_files(req); | |
99bc4c38 PB |
5735 | } |
5736 | ||
3529d8c2 | 5737 | static int io_issue_sqe(struct io_kiocb *req, const struct io_uring_sqe *sqe, |
f13fad7b | 5738 | bool force_nonblock, struct io_comp_state *cs) |
2b188cc1 | 5739 | { |
a197f664 | 5740 | struct io_ring_ctx *ctx = req->ctx; |
d625c6ee | 5741 | int ret; |
2b188cc1 | 5742 | |
d625c6ee | 5743 | switch (req->opcode) { |
2b188cc1 | 5744 | case IORING_OP_NOP: |
229a7b63 | 5745 | ret = io_nop(req, cs); |
2b188cc1 JA |
5746 | break; |
5747 | case IORING_OP_READV: | |
edafccee | 5748 | case IORING_OP_READ_FIXED: |
3a6820f2 | 5749 | case IORING_OP_READ: |
3529d8c2 JA |
5750 | if (sqe) { |
5751 | ret = io_read_prep(req, sqe, force_nonblock); | |
5752 | if (ret < 0) | |
5753 | break; | |
5754 | } | |
a1d7c393 | 5755 | ret = io_read(req, force_nonblock, cs); |
edafccee | 5756 | break; |
3529d8c2 | 5757 | case IORING_OP_WRITEV: |
edafccee | 5758 | case IORING_OP_WRITE_FIXED: |
3a6820f2 | 5759 | case IORING_OP_WRITE: |
3529d8c2 JA |
5760 | if (sqe) { |
5761 | ret = io_write_prep(req, sqe, force_nonblock); | |
5762 | if (ret < 0) | |
5763 | break; | |
5764 | } | |
a1d7c393 | 5765 | ret = io_write(req, force_nonblock, cs); |
2b188cc1 | 5766 | break; |
c992fe29 | 5767 | case IORING_OP_FSYNC: |
3529d8c2 JA |
5768 | if (sqe) { |
5769 | ret = io_prep_fsync(req, sqe); | |
5770 | if (ret < 0) | |
5771 | break; | |
5772 | } | |
014db007 | 5773 | ret = io_fsync(req, force_nonblock); |
c992fe29 | 5774 | break; |
221c5eb2 | 5775 | case IORING_OP_POLL_ADD: |
3529d8c2 JA |
5776 | if (sqe) { |
5777 | ret = io_poll_add_prep(req, sqe); | |
5778 | if (ret) | |
5779 | break; | |
5780 | } | |
014db007 | 5781 | ret = io_poll_add(req); |
221c5eb2 JA |
5782 | break; |
5783 | case IORING_OP_POLL_REMOVE: | |
3529d8c2 JA |
5784 | if (sqe) { |
5785 | ret = io_poll_remove_prep(req, sqe); | |
5786 | if (ret < 0) | |
5787 | break; | |
5788 | } | |
fc4df999 | 5789 | ret = io_poll_remove(req); |
221c5eb2 | 5790 | break; |
5d17b4a4 | 5791 | case IORING_OP_SYNC_FILE_RANGE: |
3529d8c2 JA |
5792 | if (sqe) { |
5793 | ret = io_prep_sfr(req, sqe); | |
5794 | if (ret < 0) | |
5795 | break; | |
5796 | } | |
014db007 | 5797 | ret = io_sync_file_range(req, force_nonblock); |
5d17b4a4 | 5798 | break; |
0fa03c62 | 5799 | case IORING_OP_SENDMSG: |
fddaface | 5800 | case IORING_OP_SEND: |
3529d8c2 JA |
5801 | if (sqe) { |
5802 | ret = io_sendmsg_prep(req, sqe); | |
5803 | if (ret < 0) | |
5804 | break; | |
5805 | } | |
fddaface | 5806 | if (req->opcode == IORING_OP_SENDMSG) |
229a7b63 | 5807 | ret = io_sendmsg(req, force_nonblock, cs); |
fddaface | 5808 | else |
229a7b63 | 5809 | ret = io_send(req, force_nonblock, cs); |
0fa03c62 | 5810 | break; |
aa1fa28f | 5811 | case IORING_OP_RECVMSG: |
fddaface | 5812 | case IORING_OP_RECV: |
3529d8c2 JA |
5813 | if (sqe) { |
5814 | ret = io_recvmsg_prep(req, sqe); | |
5815 | if (ret) | |
5816 | break; | |
5817 | } | |
fddaface | 5818 | if (req->opcode == IORING_OP_RECVMSG) |
229a7b63 | 5819 | ret = io_recvmsg(req, force_nonblock, cs); |
fddaface | 5820 | else |
229a7b63 | 5821 | ret = io_recv(req, force_nonblock, cs); |
aa1fa28f | 5822 | break; |
5262f567 | 5823 | case IORING_OP_TIMEOUT: |
3529d8c2 JA |
5824 | if (sqe) { |
5825 | ret = io_timeout_prep(req, sqe, false); | |
5826 | if (ret) | |
5827 | break; | |
5828 | } | |
fc4df999 | 5829 | ret = io_timeout(req); |
5262f567 | 5830 | break; |
11365043 | 5831 | case IORING_OP_TIMEOUT_REMOVE: |
3529d8c2 JA |
5832 | if (sqe) { |
5833 | ret = io_timeout_remove_prep(req, sqe); | |
5834 | if (ret) | |
5835 | break; | |
5836 | } | |
fc4df999 | 5837 | ret = io_timeout_remove(req); |
11365043 | 5838 | break; |
17f2fe35 | 5839 | case IORING_OP_ACCEPT: |
3529d8c2 JA |
5840 | if (sqe) { |
5841 | ret = io_accept_prep(req, sqe); | |
5842 | if (ret) | |
5843 | break; | |
5844 | } | |
229a7b63 | 5845 | ret = io_accept(req, force_nonblock, cs); |
17f2fe35 | 5846 | break; |
f8e85cf2 | 5847 | case IORING_OP_CONNECT: |
3529d8c2 JA |
5848 | if (sqe) { |
5849 | ret = io_connect_prep(req, sqe); | |
5850 | if (ret) | |
5851 | break; | |
5852 | } | |
229a7b63 | 5853 | ret = io_connect(req, force_nonblock, cs); |
f8e85cf2 | 5854 | break; |
62755e35 | 5855 | case IORING_OP_ASYNC_CANCEL: |
3529d8c2 JA |
5856 | if (sqe) { |
5857 | ret = io_async_cancel_prep(req, sqe); | |
5858 | if (ret) | |
5859 | break; | |
5860 | } | |
014db007 | 5861 | ret = io_async_cancel(req); |
62755e35 | 5862 | break; |
d63d1b5e JA |
5863 | case IORING_OP_FALLOCATE: |
5864 | if (sqe) { | |
5865 | ret = io_fallocate_prep(req, sqe); | |
5866 | if (ret) | |
5867 | break; | |
5868 | } | |
014db007 | 5869 | ret = io_fallocate(req, force_nonblock); |
d63d1b5e | 5870 | break; |
15b71abe JA |
5871 | case IORING_OP_OPENAT: |
5872 | if (sqe) { | |
5873 | ret = io_openat_prep(req, sqe); | |
5874 | if (ret) | |
5875 | break; | |
5876 | } | |
014db007 | 5877 | ret = io_openat(req, force_nonblock); |
15b71abe | 5878 | break; |
b5dba59e JA |
5879 | case IORING_OP_CLOSE: |
5880 | if (sqe) { | |
5881 | ret = io_close_prep(req, sqe); | |
5882 | if (ret) | |
5883 | break; | |
5884 | } | |
229a7b63 | 5885 | ret = io_close(req, force_nonblock, cs); |
b5dba59e | 5886 | break; |
05f3fb3c JA |
5887 | case IORING_OP_FILES_UPDATE: |
5888 | if (sqe) { | |
5889 | ret = io_files_update_prep(req, sqe); | |
5890 | if (ret) | |
5891 | break; | |
5892 | } | |
229a7b63 | 5893 | ret = io_files_update(req, force_nonblock, cs); |
05f3fb3c | 5894 | break; |
eddc7ef5 JA |
5895 | case IORING_OP_STATX: |
5896 | if (sqe) { | |
5897 | ret = io_statx_prep(req, sqe); | |
5898 | if (ret) | |
5899 | break; | |
5900 | } | |
014db007 | 5901 | ret = io_statx(req, force_nonblock); |
eddc7ef5 | 5902 | break; |
4840e418 JA |
5903 | case IORING_OP_FADVISE: |
5904 | if (sqe) { | |
5905 | ret = io_fadvise_prep(req, sqe); | |
5906 | if (ret) | |
5907 | break; | |
5908 | } | |
014db007 | 5909 | ret = io_fadvise(req, force_nonblock); |
4840e418 | 5910 | break; |
c1ca757b JA |
5911 | case IORING_OP_MADVISE: |
5912 | if (sqe) { | |
5913 | ret = io_madvise_prep(req, sqe); | |
5914 | if (ret) | |
5915 | break; | |
5916 | } | |
014db007 | 5917 | ret = io_madvise(req, force_nonblock); |
c1ca757b | 5918 | break; |
cebdb986 JA |
5919 | case IORING_OP_OPENAT2: |
5920 | if (sqe) { | |
5921 | ret = io_openat2_prep(req, sqe); | |
5922 | if (ret) | |
5923 | break; | |
5924 | } | |
014db007 | 5925 | ret = io_openat2(req, force_nonblock); |
cebdb986 | 5926 | break; |
3e4827b0 JA |
5927 | case IORING_OP_EPOLL_CTL: |
5928 | if (sqe) { | |
5929 | ret = io_epoll_ctl_prep(req, sqe); | |
5930 | if (ret) | |
5931 | break; | |
5932 | } | |
229a7b63 | 5933 | ret = io_epoll_ctl(req, force_nonblock, cs); |
3e4827b0 | 5934 | break; |
7d67af2c PB |
5935 | case IORING_OP_SPLICE: |
5936 | if (sqe) { | |
5937 | ret = io_splice_prep(req, sqe); | |
5938 | if (ret < 0) | |
5939 | break; | |
5940 | } | |
014db007 | 5941 | ret = io_splice(req, force_nonblock); |
7d67af2c | 5942 | break; |
ddf0322d JA |
5943 | case IORING_OP_PROVIDE_BUFFERS: |
5944 | if (sqe) { | |
5945 | ret = io_provide_buffers_prep(req, sqe); | |
5946 | if (ret) | |
5947 | break; | |
5948 | } | |
229a7b63 | 5949 | ret = io_provide_buffers(req, force_nonblock, cs); |
ddf0322d | 5950 | break; |
067524e9 JA |
5951 | case IORING_OP_REMOVE_BUFFERS: |
5952 | if (sqe) { | |
5953 | ret = io_remove_buffers_prep(req, sqe); | |
5954 | if (ret) | |
5955 | break; | |
5956 | } | |
229a7b63 | 5957 | ret = io_remove_buffers(req, force_nonblock, cs); |
3e4827b0 | 5958 | break; |
f2a8d5c7 PB |
5959 | case IORING_OP_TEE: |
5960 | if (sqe) { | |
5961 | ret = io_tee_prep(req, sqe); | |
5962 | if (ret < 0) | |
5963 | break; | |
5964 | } | |
5965 | ret = io_tee(req, force_nonblock); | |
5966 | break; | |
2b188cc1 JA |
5967 | default: |
5968 | ret = -EINVAL; | |
5969 | break; | |
5970 | } | |
5971 | ||
def596e9 JA |
5972 | if (ret) |
5973 | return ret; | |
5974 | ||
b532576e JA |
5975 | /* If the op doesn't have a file, we're not polling for it */ |
5976 | if ((ctx->flags & IORING_SETUP_IOPOLL) && req->file) { | |
11ba820b JA |
5977 | const bool in_async = io_wq_current_is_worker(); |
5978 | ||
11ba820b JA |
5979 | /* workqueue context doesn't hold uring_lock, grab it now */ |
5980 | if (in_async) | |
5981 | mutex_lock(&ctx->uring_lock); | |
5982 | ||
def596e9 | 5983 | io_iopoll_req_issued(req); |
11ba820b JA |
5984 | |
5985 | if (in_async) | |
5986 | mutex_unlock(&ctx->uring_lock); | |
def596e9 JA |
5987 | } |
5988 | ||
5989 | return 0; | |
2b188cc1 JA |
5990 | } |
5991 | ||
f4db7182 | 5992 | static struct io_wq_work *io_wq_submit_work(struct io_wq_work *work) |
2b188cc1 JA |
5993 | { |
5994 | struct io_kiocb *req = container_of(work, struct io_kiocb, work); | |
6df1db6b | 5995 | struct io_kiocb *timeout; |
561fb04a | 5996 | int ret = 0; |
2b188cc1 | 5997 | |
6df1db6b PB |
5998 | timeout = io_prep_linked_timeout(req); |
5999 | if (timeout) | |
6000 | io_queue_linked_timeout(timeout); | |
d4c81f38 | 6001 | |
0c9d5ccd JA |
6002 | /* if NO_CANCEL is set, we must still run the work */ |
6003 | if ((work->flags & (IO_WQ_WORK_CANCEL|IO_WQ_WORK_NO_CANCEL)) == | |
6004 | IO_WQ_WORK_CANCEL) { | |
561fb04a | 6005 | ret = -ECANCELED; |
0c9d5ccd | 6006 | } |
31b51510 | 6007 | |
561fb04a | 6008 | if (!ret) { |
561fb04a | 6009 | do { |
f13fad7b | 6010 | ret = io_issue_sqe(req, NULL, false, NULL); |
561fb04a JA |
6011 | /* |
6012 | * We can get EAGAIN for polled IO even though we're | |
6013 | * forcing a sync submission from here, since we can't | |
6014 | * wait for request slots on the block side. | |
6015 | */ | |
6016 | if (ret != -EAGAIN) | |
6017 | break; | |
6018 | cond_resched(); | |
6019 | } while (1); | |
6020 | } | |
31b51510 | 6021 | |
561fb04a | 6022 | if (ret) { |
4e88d6e7 | 6023 | req_set_fail_links(req); |
e1e16097 | 6024 | io_req_complete(req, ret); |
edafccee | 6025 | } |
2b188cc1 | 6026 | |
f4db7182 | 6027 | return io_steal_work(req); |
2b188cc1 JA |
6028 | } |
6029 | ||
65e19f54 JA |
6030 | static inline struct file *io_file_from_index(struct io_ring_ctx *ctx, |
6031 | int index) | |
6032 | { | |
6033 | struct fixed_file_table *table; | |
6034 | ||
05f3fb3c | 6035 | table = &ctx->file_data->table[index >> IORING_FILE_TABLE_SHIFT]; |
84695089 | 6036 | return table->files[index & IORING_FILE_TABLE_MASK]; |
65e19f54 JA |
6037 | } |
6038 | ||
8da11c19 PB |
6039 | static int io_file_get(struct io_submit_state *state, struct io_kiocb *req, |
6040 | int fd, struct file **out_file, bool fixed) | |
09bb8394 | 6041 | { |
a197f664 | 6042 | struct io_ring_ctx *ctx = req->ctx; |
8da11c19 | 6043 | struct file *file; |
09bb8394 | 6044 | |
8da11c19 | 6045 | if (fixed) { |
05f3fb3c | 6046 | if (unlikely(!ctx->file_data || |
09bb8394 JA |
6047 | (unsigned) fd >= ctx->nr_user_files)) |
6048 | return -EBADF; | |
b7620121 | 6049 | fd = array_index_nospec(fd, ctx->nr_user_files); |
8da11c19 | 6050 | file = io_file_from_index(ctx, fd); |
fd2206e4 JA |
6051 | if (file) { |
6052 | req->fixed_file_refs = ctx->file_data->cur_refs; | |
6053 | percpu_ref_get(req->fixed_file_refs); | |
6054 | } | |
09bb8394 | 6055 | } else { |
c826bd7a | 6056 | trace_io_uring_file_get(ctx, fd); |
8da11c19 | 6057 | file = __io_file_get(state, fd); |
09bb8394 JA |
6058 | } |
6059 | ||
fd2206e4 JA |
6060 | if (file || io_op_defs[req->opcode].needs_file_no_error) { |
6061 | *out_file = file; | |
6062 | return 0; | |
6063 | } | |
6064 | return -EBADF; | |
09bb8394 JA |
6065 | } |
6066 | ||
8da11c19 | 6067 | static int io_req_set_file(struct io_submit_state *state, struct io_kiocb *req, |
63ff8223 | 6068 | int fd) |
8da11c19 | 6069 | { |
8da11c19 PB |
6070 | bool fixed; |
6071 | ||
63ff8223 | 6072 | fixed = (req->flags & REQ_F_FIXED_FILE) != 0; |
0cdaf760 | 6073 | if (unlikely(!fixed && io_async_submit(req->ctx))) |
8da11c19 PB |
6074 | return -EBADF; |
6075 | ||
6076 | return io_file_get(state, req, fd, &req->file, fixed); | |
6077 | } | |
6078 | ||
a197f664 | 6079 | static int io_grab_files(struct io_kiocb *req) |
fcb323cc | 6080 | { |
a197f664 | 6081 | struct io_ring_ctx *ctx = req->ctx; |
fcb323cc | 6082 | |
f56040b8 PB |
6083 | io_req_init_async(req); |
6084 | ||
5b0bbee4 | 6085 | if (req->work.files || (req->flags & REQ_F_NO_FILE_TABLE)) |
f86cd20c | 6086 | return 0; |
b5dba59e | 6087 | |
0f212204 JA |
6088 | req->work.files = get_files_struct(current); |
6089 | req->flags |= REQ_F_INFLIGHT; | |
6090 | ||
fcb323cc | 6091 | spin_lock_irq(&ctx->inflight_lock); |
0f212204 | 6092 | list_add(&req->inflight_entry, &ctx->inflight_list); |
fcb323cc | 6093 | spin_unlock_irq(&ctx->inflight_lock); |
0f212204 | 6094 | return 0; |
fcb323cc JA |
6095 | } |
6096 | ||
f56040b8 PB |
6097 | static inline int io_prep_work_files(struct io_kiocb *req) |
6098 | { | |
6099 | if (!io_op_defs[req->opcode].file_table) | |
6100 | return 0; | |
6101 | return io_grab_files(req); | |
6102 | } | |
6103 | ||
2665abfd | 6104 | static enum hrtimer_restart io_link_timeout_fn(struct hrtimer *timer) |
2b188cc1 | 6105 | { |
ad8a48ac JA |
6106 | struct io_timeout_data *data = container_of(timer, |
6107 | struct io_timeout_data, timer); | |
6108 | struct io_kiocb *req = data->req; | |
2665abfd JA |
6109 | struct io_ring_ctx *ctx = req->ctx; |
6110 | struct io_kiocb *prev = NULL; | |
6111 | unsigned long flags; | |
2665abfd JA |
6112 | |
6113 | spin_lock_irqsave(&ctx->completion_lock, flags); | |
6114 | ||
6115 | /* | |
6116 | * We don't expect the list to be empty, that will only happen if we | |
6117 | * race with the completion of the linked work. | |
6118 | */ | |
4493233e PB |
6119 | if (!list_empty(&req->link_list)) { |
6120 | prev = list_entry(req->link_list.prev, struct io_kiocb, | |
6121 | link_list); | |
5d960724 | 6122 | if (refcount_inc_not_zero(&prev->refs)) { |
4493233e | 6123 | list_del_init(&req->link_list); |
5d960724 JA |
6124 | prev->flags &= ~REQ_F_LINK_TIMEOUT; |
6125 | } else | |
76a46e06 | 6126 | prev = NULL; |
2665abfd JA |
6127 | } |
6128 | ||
6129 | spin_unlock_irqrestore(&ctx->completion_lock, flags); | |
6130 | ||
6131 | if (prev) { | |
4e88d6e7 | 6132 | req_set_fail_links(prev); |
014db007 | 6133 | io_async_find_and_cancel(ctx, req, prev->user_data, -ETIME); |
76a46e06 | 6134 | io_put_req(prev); |
47f46768 | 6135 | } else { |
e1e16097 | 6136 | io_req_complete(req, -ETIME); |
2665abfd | 6137 | } |
2665abfd JA |
6138 | return HRTIMER_NORESTART; |
6139 | } | |
6140 | ||
7271ef3a | 6141 | static void __io_queue_linked_timeout(struct io_kiocb *req) |
2665abfd | 6142 | { |
76a46e06 JA |
6143 | /* |
6144 | * If the list is now empty, then our linked request finished before | |
6145 | * we got a chance to setup the timer | |
6146 | */ | |
4493233e | 6147 | if (!list_empty(&req->link_list)) { |
2d28390a | 6148 | struct io_timeout_data *data = &req->io->timeout; |
94ae5e77 | 6149 | |
ad8a48ac JA |
6150 | data->timer.function = io_link_timeout_fn; |
6151 | hrtimer_start(&data->timer, timespec64_to_ktime(data->ts), | |
6152 | data->mode); | |
2665abfd | 6153 | } |
7271ef3a JA |
6154 | } |
6155 | ||
6156 | static void io_queue_linked_timeout(struct io_kiocb *req) | |
6157 | { | |
6158 | struct io_ring_ctx *ctx = req->ctx; | |
6159 | ||
6160 | spin_lock_irq(&ctx->completion_lock); | |
6161 | __io_queue_linked_timeout(req); | |
76a46e06 | 6162 | spin_unlock_irq(&ctx->completion_lock); |
2665abfd | 6163 | |
2665abfd | 6164 | /* drop submission reference */ |
76a46e06 JA |
6165 | io_put_req(req); |
6166 | } | |
2665abfd | 6167 | |
ad8a48ac | 6168 | static struct io_kiocb *io_prep_linked_timeout(struct io_kiocb *req) |
2665abfd JA |
6169 | { |
6170 | struct io_kiocb *nxt; | |
6171 | ||
dea3b49c | 6172 | if (!(req->flags & REQ_F_LINK_HEAD)) |
2665abfd | 6173 | return NULL; |
6df1db6b | 6174 | if (req->flags & REQ_F_LINK_TIMEOUT) |
d7718a9d | 6175 | return NULL; |
2665abfd | 6176 | |
4493233e PB |
6177 | nxt = list_first_entry_or_null(&req->link_list, struct io_kiocb, |
6178 | link_list); | |
d625c6ee | 6179 | if (!nxt || nxt->opcode != IORING_OP_LINK_TIMEOUT) |
76a46e06 | 6180 | return NULL; |
2665abfd | 6181 | |
76a46e06 | 6182 | req->flags |= REQ_F_LINK_TIMEOUT; |
76a46e06 | 6183 | return nxt; |
2665abfd JA |
6184 | } |
6185 | ||
f13fad7b JA |
6186 | static void __io_queue_sqe(struct io_kiocb *req, const struct io_uring_sqe *sqe, |
6187 | struct io_comp_state *cs) | |
2b188cc1 | 6188 | { |
4a0a7a18 | 6189 | struct io_kiocb *linked_timeout; |
4bc4494e | 6190 | struct io_kiocb *nxt; |
193155c8 | 6191 | const struct cred *old_creds = NULL; |
e0c5c576 | 6192 | int ret; |
2b188cc1 | 6193 | |
4a0a7a18 JA |
6194 | again: |
6195 | linked_timeout = io_prep_linked_timeout(req); | |
6196 | ||
7cdaf587 XW |
6197 | if ((req->flags & REQ_F_WORK_INITIALIZED) && req->work.creds && |
6198 | req->work.creds != current_cred()) { | |
193155c8 JA |
6199 | if (old_creds) |
6200 | revert_creds(old_creds); | |
6201 | if (old_creds == req->work.creds) | |
6202 | old_creds = NULL; /* restored original creds */ | |
6203 | else | |
6204 | old_creds = override_creds(req->work.creds); | |
6205 | } | |
6206 | ||
f13fad7b | 6207 | ret = io_issue_sqe(req, sqe, true, cs); |
491381ce JA |
6208 | |
6209 | /* | |
6210 | * We async punt it if the file wasn't marked NOWAIT, or if the file | |
6211 | * doesn't support non-blocking read/write attempts | |
6212 | */ | |
24c74678 | 6213 | if (ret == -EAGAIN && !(req->flags & REQ_F_NOWAIT)) { |
f063c547 | 6214 | if (!io_arm_poll_handler(req)) { |
86a761f8 | 6215 | punt: |
f063c547 PB |
6216 | ret = io_prep_work_files(req); |
6217 | if (unlikely(ret)) | |
bbad27b2 | 6218 | goto err; |
f063c547 PB |
6219 | /* |
6220 | * Queued up for async execution, worker will release | |
6221 | * submit reference when the iocb is actually submitted. | |
6222 | */ | |
6223 | io_queue_async_work(req); | |
2b188cc1 | 6224 | } |
bbad27b2 | 6225 | |
f063c547 PB |
6226 | if (linked_timeout) |
6227 | io_queue_linked_timeout(linked_timeout); | |
4bc4494e | 6228 | goto exit; |
2b188cc1 | 6229 | } |
e65ef56d | 6230 | |
652532ad | 6231 | if (unlikely(ret)) { |
fcb323cc | 6232 | err: |
652532ad PB |
6233 | /* un-prep timeout, so it'll be killed as any other linked */ |
6234 | req->flags &= ~REQ_F_LINK_TIMEOUT; | |
4e88d6e7 | 6235 | req_set_fail_links(req); |
e65ef56d | 6236 | io_put_req(req); |
e1e16097 | 6237 | io_req_complete(req, ret); |
652532ad | 6238 | goto exit; |
9e645e11 | 6239 | } |
652532ad PB |
6240 | |
6241 | /* drop submission reference */ | |
6242 | nxt = io_put_req_find_next(req); | |
6243 | if (linked_timeout) | |
6244 | io_queue_linked_timeout(linked_timeout); | |
6245 | ||
4a0a7a18 JA |
6246 | if (nxt) { |
6247 | req = nxt; | |
86a761f8 PB |
6248 | |
6249 | if (req->flags & REQ_F_FORCE_ASYNC) | |
6250 | goto punt; | |
4a0a7a18 JA |
6251 | goto again; |
6252 | } | |
4bc4494e | 6253 | exit: |
193155c8 JA |
6254 | if (old_creds) |
6255 | revert_creds(old_creds); | |
2b188cc1 JA |
6256 | } |
6257 | ||
f13fad7b JA |
6258 | static void io_queue_sqe(struct io_kiocb *req, const struct io_uring_sqe *sqe, |
6259 | struct io_comp_state *cs) | |
4fe2c963 JL |
6260 | { |
6261 | int ret; | |
6262 | ||
3529d8c2 | 6263 | ret = io_req_defer(req, sqe); |
4fe2c963 JL |
6264 | if (ret) { |
6265 | if (ret != -EIOCBQUEUED) { | |
1118591a | 6266 | fail_req: |
4e88d6e7 | 6267 | req_set_fail_links(req); |
e1e16097 JA |
6268 | io_put_req(req); |
6269 | io_req_complete(req, ret); | |
4fe2c963 | 6270 | } |
2550878f | 6271 | } else if (req->flags & REQ_F_FORCE_ASYNC) { |
bd2ab18a | 6272 | if (!req->io) { |
bd2ab18a | 6273 | ret = io_req_defer_prep(req, sqe); |
327d6d96 | 6274 | if (unlikely(ret)) |
bd2ab18a PB |
6275 | goto fail_req; |
6276 | } | |
6277 | ||
ce35a47a JA |
6278 | /* |
6279 | * Never try inline submit of IOSQE_ASYNC is set, go straight | |
6280 | * to async execution. | |
6281 | */ | |
3e863ea3 | 6282 | io_req_init_async(req); |
ce35a47a JA |
6283 | req->work.flags |= IO_WQ_WORK_CONCURRENT; |
6284 | io_queue_async_work(req); | |
6285 | } else { | |
f13fad7b | 6286 | __io_queue_sqe(req, sqe, cs); |
ce35a47a | 6287 | } |
4fe2c963 JL |
6288 | } |
6289 | ||
f13fad7b JA |
6290 | static inline void io_queue_link_head(struct io_kiocb *req, |
6291 | struct io_comp_state *cs) | |
4fe2c963 | 6292 | { |
94ae5e77 | 6293 | if (unlikely(req->flags & REQ_F_FAIL_LINK)) { |
e1e16097 JA |
6294 | io_put_req(req); |
6295 | io_req_complete(req, -ECANCELED); | |
1b4a51b6 | 6296 | } else |
f13fad7b | 6297 | io_queue_sqe(req, NULL, cs); |
4fe2c963 JL |
6298 | } |
6299 | ||
1d4240cc | 6300 | static int io_submit_sqe(struct io_kiocb *req, const struct io_uring_sqe *sqe, |
f13fad7b | 6301 | struct io_kiocb **link, struct io_comp_state *cs) |
9e645e11 | 6302 | { |
a197f664 | 6303 | struct io_ring_ctx *ctx = req->ctx; |
ef4ff581 | 6304 | int ret; |
9e645e11 | 6305 | |
9e645e11 JA |
6306 | /* |
6307 | * If we already have a head request, queue this one for async | |
6308 | * submittal once the head completes. If we don't have a head but | |
6309 | * IOSQE_IO_LINK is set in the sqe, start a new head. This one will be | |
6310 | * submitted sync once the chain is complete. If none of those | |
6311 | * conditions are true (normal request), then just queue it. | |
6312 | */ | |
6313 | if (*link) { | |
9d76377f | 6314 | struct io_kiocb *head = *link; |
4e88d6e7 | 6315 | |
8cdf2193 PB |
6316 | /* |
6317 | * Taking sequential execution of a link, draining both sides | |
6318 | * of the link also fullfils IOSQE_IO_DRAIN semantics for all | |
6319 | * requests in the link. So, it drains the head and the | |
6320 | * next after the link request. The last one is done via | |
6321 | * drain_next flag to persist the effect across calls. | |
6322 | */ | |
ef4ff581 | 6323 | if (req->flags & REQ_F_IO_DRAIN) { |
711be031 PB |
6324 | head->flags |= REQ_F_IO_DRAIN; |
6325 | ctx->drain_next = 1; | |
6326 | } | |
3529d8c2 | 6327 | ret = io_req_defer_prep(req, sqe); |
327d6d96 | 6328 | if (unlikely(ret)) { |
4e88d6e7 | 6329 | /* fail even hard links since we don't submit */ |
9d76377f | 6330 | head->flags |= REQ_F_FAIL_LINK; |
1d4240cc | 6331 | return ret; |
2d28390a | 6332 | } |
9d76377f PB |
6333 | trace_io_uring_link(ctx, req, head); |
6334 | list_add_tail(&req->link_list, &head->link_list); | |
32fe525b PB |
6335 | |
6336 | /* last request of a link, enqueue the link */ | |
ef4ff581 | 6337 | if (!(req->flags & (REQ_F_LINK | REQ_F_HARDLINK))) { |
f13fad7b | 6338 | io_queue_link_head(head, cs); |
32fe525b PB |
6339 | *link = NULL; |
6340 | } | |
9e645e11 | 6341 | } else { |
711be031 PB |
6342 | if (unlikely(ctx->drain_next)) { |
6343 | req->flags |= REQ_F_IO_DRAIN; | |
ef4ff581 | 6344 | ctx->drain_next = 0; |
711be031 | 6345 | } |
ef4ff581 | 6346 | if (req->flags & (REQ_F_LINK | REQ_F_HARDLINK)) { |
dea3b49c | 6347 | req->flags |= REQ_F_LINK_HEAD; |
711be031 | 6348 | INIT_LIST_HEAD(&req->link_list); |
f1d96a8f | 6349 | |
711be031 | 6350 | ret = io_req_defer_prep(req, sqe); |
327d6d96 | 6351 | if (unlikely(ret)) |
711be031 PB |
6352 | req->flags |= REQ_F_FAIL_LINK; |
6353 | *link = req; | |
6354 | } else { | |
f13fad7b | 6355 | io_queue_sqe(req, sqe, cs); |
711be031 | 6356 | } |
9e645e11 | 6357 | } |
2e6e1fde | 6358 | |
1d4240cc | 6359 | return 0; |
9e645e11 JA |
6360 | } |
6361 | ||
9a56a232 JA |
6362 | /* |
6363 | * Batched submission is done, ensure local IO is flushed out. | |
6364 | */ | |
6365 | static void io_submit_state_end(struct io_submit_state *state) | |
6366 | { | |
f13fad7b JA |
6367 | if (!list_empty(&state->comp.list)) |
6368 | io_submit_flush_completions(&state->comp); | |
9a56a232 | 6369 | blk_finish_plug(&state->plug); |
9f13c35b | 6370 | io_state_file_put(state); |
2579f913 | 6371 | if (state->free_reqs) |
6c8a3134 | 6372 | kmem_cache_free_bulk(req_cachep, state->free_reqs, state->reqs); |
9a56a232 JA |
6373 | } |
6374 | ||
6375 | /* | |
6376 | * Start submission side cache. | |
6377 | */ | |
6378 | static void io_submit_state_start(struct io_submit_state *state, | |
013538bd | 6379 | struct io_ring_ctx *ctx, unsigned int max_ios) |
9a56a232 JA |
6380 | { |
6381 | blk_start_plug(&state->plug); | |
013538bd JA |
6382 | state->comp.nr = 0; |
6383 | INIT_LIST_HEAD(&state->comp.list); | |
6384 | state->comp.ctx = ctx; | |
2579f913 | 6385 | state->free_reqs = 0; |
9a56a232 JA |
6386 | state->file = NULL; |
6387 | state->ios_left = max_ios; | |
6388 | } | |
6389 | ||
2b188cc1 JA |
6390 | static void io_commit_sqring(struct io_ring_ctx *ctx) |
6391 | { | |
75b28aff | 6392 | struct io_rings *rings = ctx->rings; |
2b188cc1 | 6393 | |
caf582c6 PB |
6394 | /* |
6395 | * Ensure any loads from the SQEs are done at this point, | |
6396 | * since once we write the new head, the application could | |
6397 | * write new data to them. | |
6398 | */ | |
6399 | smp_store_release(&rings->sq.head, ctx->cached_sq_head); | |
2b188cc1 JA |
6400 | } |
6401 | ||
2b188cc1 | 6402 | /* |
3529d8c2 | 6403 | * Fetch an sqe, if one is available. Note that sqe_ptr will point to memory |
2b188cc1 JA |
6404 | * that is mapped by userspace. This means that care needs to be taken to |
6405 | * ensure that reads are stable, as we cannot rely on userspace always | |
6406 | * being a good citizen. If members of the sqe are validated and then later | |
6407 | * used, it's important that those reads are done through READ_ONCE() to | |
6408 | * prevent a re-load down the line. | |
6409 | */ | |
709b302f | 6410 | static const struct io_uring_sqe *io_get_sqe(struct io_ring_ctx *ctx) |
2b188cc1 | 6411 | { |
75b28aff | 6412 | u32 *sq_array = ctx->sq_array; |
2b188cc1 JA |
6413 | unsigned head; |
6414 | ||
6415 | /* | |
6416 | * The cached sq head (or cq tail) serves two purposes: | |
6417 | * | |
6418 | * 1) allows us to batch the cost of updating the user visible | |
6419 | * head updates. | |
6420 | * 2) allows the kernel side to track the head on its own, even | |
6421 | * though the application is the one updating it. | |
6422 | */ | |
ee7d46d9 | 6423 | head = READ_ONCE(sq_array[ctx->cached_sq_head & ctx->sq_mask]); |
709b302f PB |
6424 | if (likely(head < ctx->sq_entries)) |
6425 | return &ctx->sq_sqes[head]; | |
2b188cc1 JA |
6426 | |
6427 | /* drop invalid entries */ | |
498ccd9e | 6428 | ctx->cached_sq_dropped++; |
ee7d46d9 | 6429 | WRITE_ONCE(ctx->rings->sq_dropped, ctx->cached_sq_dropped); |
709b302f PB |
6430 | return NULL; |
6431 | } | |
6432 | ||
6433 | static inline void io_consume_sqe(struct io_ring_ctx *ctx) | |
6434 | { | |
6435 | ctx->cached_sq_head++; | |
2b188cc1 JA |
6436 | } |
6437 | ||
ef4ff581 PB |
6438 | #define SQE_VALID_FLAGS (IOSQE_FIXED_FILE|IOSQE_IO_DRAIN|IOSQE_IO_LINK| \ |
6439 | IOSQE_IO_HARDLINK | IOSQE_ASYNC | \ | |
6440 | IOSQE_BUFFER_SELECT) | |
6441 | ||
6442 | static int io_init_req(struct io_ring_ctx *ctx, struct io_kiocb *req, | |
6443 | const struct io_uring_sqe *sqe, | |
0cdaf760 | 6444 | struct io_submit_state *state) |
0553b8bd | 6445 | { |
ef4ff581 | 6446 | unsigned int sqe_flags; |
63ff8223 | 6447 | int id; |
ef4ff581 | 6448 | |
0553b8bd PB |
6449 | req->opcode = READ_ONCE(sqe->opcode); |
6450 | req->user_data = READ_ONCE(sqe->user_data); | |
6451 | req->io = NULL; | |
6452 | req->file = NULL; | |
6453 | req->ctx = ctx; | |
6454 | req->flags = 0; | |
6455 | /* one is dropped after submission, the other at completion */ | |
6456 | refcount_set(&req->refs, 2); | |
4dd2824d | 6457 | req->task = current; |
e3bc8e9d | 6458 | get_task_struct(req->task); |
0f212204 | 6459 | atomic_long_inc(&req->task->io_uring->req_issue); |
0553b8bd | 6460 | req->result = 0; |
ef4ff581 PB |
6461 | |
6462 | if (unlikely(req->opcode >= IORING_OP_LAST)) | |
6463 | return -EINVAL; | |
6464 | ||
9d8426a0 JA |
6465 | if (unlikely(io_sq_thread_acquire_mm(ctx, req))) |
6466 | return -EFAULT; | |
ef4ff581 PB |
6467 | |
6468 | sqe_flags = READ_ONCE(sqe->flags); | |
6469 | /* enforce forwards compatibility on users */ | |
6470 | if (unlikely(sqe_flags & ~SQE_VALID_FLAGS)) | |
6471 | return -EINVAL; | |
6472 | ||
6473 | if ((sqe_flags & IOSQE_BUFFER_SELECT) && | |
6474 | !io_op_defs[req->opcode].buffer_select) | |
6475 | return -EOPNOTSUPP; | |
6476 | ||
6477 | id = READ_ONCE(sqe->personality); | |
6478 | if (id) { | |
7cdaf587 | 6479 | io_req_init_async(req); |
ef4ff581 PB |
6480 | req->work.creds = idr_find(&ctx->personality_idr, id); |
6481 | if (unlikely(!req->work.creds)) | |
6482 | return -EINVAL; | |
6483 | get_cred(req->work.creds); | |
6484 | } | |
6485 | ||
6486 | /* same numerical values with corresponding REQ_F_*, safe to copy */ | |
c11368a5 | 6487 | req->flags |= sqe_flags; |
ef4ff581 | 6488 | |
63ff8223 JA |
6489 | if (!io_op_defs[req->opcode].needs_file) |
6490 | return 0; | |
6491 | ||
6492 | return io_req_set_file(state, req, READ_ONCE(sqe->fd)); | |
0553b8bd PB |
6493 | } |
6494 | ||
0f212204 | 6495 | static int io_submit_sqes(struct io_ring_ctx *ctx, unsigned int nr) |
6c271ce2 | 6496 | { |
ac8691c4 | 6497 | struct io_submit_state state; |
9e645e11 | 6498 | struct io_kiocb *link = NULL; |
9e645e11 | 6499 | int i, submitted = 0; |
6c271ce2 | 6500 | |
c4a2ed72 | 6501 | /* if we have a backlog and couldn't flush it all, return BUSY */ |
ad3eb2c8 JA |
6502 | if (test_bit(0, &ctx->sq_check_overflow)) { |
6503 | if (!list_empty(&ctx->cq_overflow_list) && | |
e6c8aa9a | 6504 | !io_cqring_overflow_flush(ctx, false, NULL, NULL)) |
ad3eb2c8 JA |
6505 | return -EBUSY; |
6506 | } | |
6c271ce2 | 6507 | |
ee7d46d9 PB |
6508 | /* make sure SQ entry isn't read before tail */ |
6509 | nr = min3(nr, ctx->sq_entries, io_sqring_entries(ctx)); | |
9ef4f124 | 6510 | |
2b85edfc PB |
6511 | if (!percpu_ref_tryget_many(&ctx->refs, nr)) |
6512 | return -EAGAIN; | |
6c271ce2 | 6513 | |
013538bd | 6514 | io_submit_state_start(&state, ctx, nr); |
6c271ce2 JA |
6515 | |
6516 | for (i = 0; i < nr; i++) { | |
3529d8c2 | 6517 | const struct io_uring_sqe *sqe; |
196be95c | 6518 | struct io_kiocb *req; |
1cb1edb2 | 6519 | int err; |
fb5ccc98 | 6520 | |
b1e50e54 PB |
6521 | sqe = io_get_sqe(ctx); |
6522 | if (unlikely(!sqe)) { | |
6523 | io_consume_sqe(ctx); | |
6524 | break; | |
6525 | } | |
ac8691c4 | 6526 | req = io_alloc_req(ctx, &state); |
196be95c PB |
6527 | if (unlikely(!req)) { |
6528 | if (!submitted) | |
6529 | submitted = -EAGAIN; | |
fb5ccc98 | 6530 | break; |
196be95c | 6531 | } |
fb5ccc98 | 6532 | |
ac8691c4 | 6533 | err = io_init_req(ctx, req, sqe, &state); |
709b302f | 6534 | io_consume_sqe(ctx); |
d3656344 JA |
6535 | /* will complete beyond this point, count as submitted */ |
6536 | submitted++; | |
6537 | ||
ef4ff581 | 6538 | if (unlikely(err)) { |
1cb1edb2 | 6539 | fail_req: |
e1e16097 JA |
6540 | io_put_req(req); |
6541 | io_req_complete(req, err); | |
196be95c PB |
6542 | break; |
6543 | } | |
fb5ccc98 | 6544 | |
354420f7 | 6545 | trace_io_uring_submit_sqe(ctx, req->opcode, req->user_data, |
0cdaf760 | 6546 | true, io_async_submit(ctx)); |
f13fad7b | 6547 | err = io_submit_sqe(req, sqe, &link, &state.comp); |
1d4240cc PB |
6548 | if (err) |
6549 | goto fail_req; | |
6c271ce2 JA |
6550 | } |
6551 | ||
9466f437 PB |
6552 | if (unlikely(submitted != nr)) { |
6553 | int ref_used = (submitted == -EAGAIN) ? 0 : submitted; | |
6554 | ||
6555 | percpu_ref_put_many(&ctx->refs, nr - ref_used); | |
6556 | } | |
9e645e11 | 6557 | if (link) |
f13fad7b | 6558 | io_queue_link_head(link, &state.comp); |
ac8691c4 | 6559 | io_submit_state_end(&state); |
6c271ce2 | 6560 | |
ae9428ca PB |
6561 | /* Commit SQ ring head once we've consumed and submitted all SQEs */ |
6562 | io_commit_sqring(ctx); | |
6563 | ||
6c271ce2 JA |
6564 | return submitted; |
6565 | } | |
6566 | ||
23b3628e XW |
6567 | static inline void io_ring_set_wakeup_flag(struct io_ring_ctx *ctx) |
6568 | { | |
6569 | /* Tell userspace we may need a wakeup call */ | |
6570 | spin_lock_irq(&ctx->completion_lock); | |
6571 | ctx->rings->sq_flags |= IORING_SQ_NEED_WAKEUP; | |
6572 | spin_unlock_irq(&ctx->completion_lock); | |
6573 | } | |
6574 | ||
6575 | static inline void io_ring_clear_wakeup_flag(struct io_ring_ctx *ctx) | |
6576 | { | |
6577 | spin_lock_irq(&ctx->completion_lock); | |
6578 | ctx->rings->sq_flags &= ~IORING_SQ_NEED_WAKEUP; | |
6579 | spin_unlock_irq(&ctx->completion_lock); | |
6580 | } | |
6581 | ||
6c271ce2 JA |
6582 | static int io_sq_thread(void *data) |
6583 | { | |
6c271ce2 | 6584 | struct io_ring_ctx *ctx = data; |
181e448d | 6585 | const struct cred *old_cred; |
6c271ce2 | 6586 | DEFINE_WAIT(wait); |
6c271ce2 | 6587 | unsigned long timeout; |
bdcd3eab | 6588 | int ret = 0; |
6c271ce2 | 6589 | |
0f158b4c | 6590 | complete(&ctx->sq_thread_comp); |
a4c0b3de | 6591 | |
181e448d | 6592 | old_cred = override_creds(ctx->creds); |
6c271ce2 | 6593 | |
bdcd3eab | 6594 | timeout = jiffies + ctx->sq_thread_idle; |
2bbcd6d3 | 6595 | while (!kthread_should_park()) { |
fb5ccc98 | 6596 | unsigned int to_submit; |
6c271ce2 | 6597 | |
540e32a0 | 6598 | if (!list_empty(&ctx->iopoll_list)) { |
6c271ce2 JA |
6599 | unsigned nr_events = 0; |
6600 | ||
bdcd3eab | 6601 | mutex_lock(&ctx->uring_lock); |
540e32a0 | 6602 | if (!list_empty(&ctx->iopoll_list) && !need_resched()) |
9dedd563 | 6603 | io_do_iopoll(ctx, &nr_events, 0); |
bdcd3eab | 6604 | else |
6c271ce2 | 6605 | timeout = jiffies + ctx->sq_thread_idle; |
bdcd3eab | 6606 | mutex_unlock(&ctx->uring_lock); |
6c271ce2 JA |
6607 | } |
6608 | ||
fb5ccc98 | 6609 | to_submit = io_sqring_entries(ctx); |
c1edbf5f JA |
6610 | |
6611 | /* | |
6612 | * If submit got -EBUSY, flag us as needing the application | |
6613 | * to enter the kernel to reap and flush events. | |
6614 | */ | |
b772f07a | 6615 | if (!to_submit || ret == -EBUSY || need_resched()) { |
7143b5ac SG |
6616 | /* |
6617 | * Drop cur_mm before scheduling, we can't hold it for | |
6618 | * long periods (or over schedule()). Do this before | |
6619 | * adding ourselves to the waitqueue, as the unuse/drop | |
6620 | * may sleep. | |
6621 | */ | |
4349f30e | 6622 | io_sq_thread_drop_mm(); |
7143b5ac | 6623 | |
6c271ce2 JA |
6624 | /* |
6625 | * We're polling. If we're within the defined idle | |
6626 | * period, then let us spin without work before going | |
c1edbf5f JA |
6627 | * to sleep. The exception is if we got EBUSY doing |
6628 | * more IO, we should wait for the application to | |
6629 | * reap events and wake us up. | |
6c271ce2 | 6630 | */ |
540e32a0 | 6631 | if (!list_empty(&ctx->iopoll_list) || need_resched() || |
df069d80 JA |
6632 | (!time_after(jiffies, timeout) && ret != -EBUSY && |
6633 | !percpu_ref_is_dying(&ctx->refs))) { | |
4c6e277c | 6634 | io_run_task_work(); |
9831a90c | 6635 | cond_resched(); |
6c271ce2 JA |
6636 | continue; |
6637 | } | |
6638 | ||
6c271ce2 JA |
6639 | prepare_to_wait(&ctx->sqo_wait, &wait, |
6640 | TASK_INTERRUPTIBLE); | |
6641 | ||
bdcd3eab XW |
6642 | /* |
6643 | * While doing polled IO, before going to sleep, we need | |
540e32a0 PB |
6644 | * to check if there are new reqs added to iopoll_list, |
6645 | * it is because reqs may have been punted to io worker | |
6646 | * and will be added to iopoll_list later, hence check | |
6647 | * the iopoll_list again. | |
bdcd3eab XW |
6648 | */ |
6649 | if ((ctx->flags & IORING_SETUP_IOPOLL) && | |
540e32a0 | 6650 | !list_empty_careful(&ctx->iopoll_list)) { |
bdcd3eab XW |
6651 | finish_wait(&ctx->sqo_wait, &wait); |
6652 | continue; | |
6653 | } | |
6654 | ||
23b3628e | 6655 | io_ring_set_wakeup_flag(ctx); |
6c271ce2 | 6656 | |
fb5ccc98 | 6657 | to_submit = io_sqring_entries(ctx); |
c1edbf5f | 6658 | if (!to_submit || ret == -EBUSY) { |
2bbcd6d3 | 6659 | if (kthread_should_park()) { |
6c271ce2 JA |
6660 | finish_wait(&ctx->sqo_wait, &wait); |
6661 | break; | |
6662 | } | |
4c6e277c | 6663 | if (io_run_task_work()) { |
10bea96d | 6664 | finish_wait(&ctx->sqo_wait, &wait); |
23b3628e | 6665 | io_ring_clear_wakeup_flag(ctx); |
b41e9852 JA |
6666 | continue; |
6667 | } | |
6c271ce2 JA |
6668 | if (signal_pending(current)) |
6669 | flush_signals(current); | |
6670 | schedule(); | |
6671 | finish_wait(&ctx->sqo_wait, &wait); | |
6672 | ||
23b3628e | 6673 | io_ring_clear_wakeup_flag(ctx); |
d4ae271d | 6674 | ret = 0; |
6c271ce2 JA |
6675 | continue; |
6676 | } | |
6677 | finish_wait(&ctx->sqo_wait, &wait); | |
6678 | ||
23b3628e | 6679 | io_ring_clear_wakeup_flag(ctx); |
6c271ce2 JA |
6680 | } |
6681 | ||
8a4955ff | 6682 | mutex_lock(&ctx->uring_lock); |
6b668c9b | 6683 | if (likely(!percpu_ref_is_dying(&ctx->refs))) |
0f212204 | 6684 | ret = io_submit_sqes(ctx, to_submit); |
8a4955ff | 6685 | mutex_unlock(&ctx->uring_lock); |
bdcd3eab | 6686 | timeout = jiffies + ctx->sq_thread_idle; |
6c271ce2 JA |
6687 | } |
6688 | ||
4c6e277c | 6689 | io_run_task_work(); |
b41e9852 | 6690 | |
4349f30e | 6691 | io_sq_thread_drop_mm(); |
181e448d | 6692 | revert_creds(old_cred); |
06058632 | 6693 | |
2bbcd6d3 | 6694 | kthread_parkme(); |
06058632 | 6695 | |
6c271ce2 JA |
6696 | return 0; |
6697 | } | |
6698 | ||
bda52162 JA |
6699 | struct io_wait_queue { |
6700 | struct wait_queue_entry wq; | |
6701 | struct io_ring_ctx *ctx; | |
6702 | unsigned to_wait; | |
6703 | unsigned nr_timeouts; | |
6704 | }; | |
6705 | ||
1d7bb1d5 | 6706 | static inline bool io_should_wake(struct io_wait_queue *iowq, bool noflush) |
bda52162 JA |
6707 | { |
6708 | struct io_ring_ctx *ctx = iowq->ctx; | |
6709 | ||
6710 | /* | |
d195a66e | 6711 | * Wake up if we have enough events, or if a timeout occurred since we |
bda52162 JA |
6712 | * started waiting. For timeouts, we always want to return to userspace, |
6713 | * regardless of event count. | |
6714 | */ | |
1d7bb1d5 | 6715 | return io_cqring_events(ctx, noflush) >= iowq->to_wait || |
bda52162 JA |
6716 | atomic_read(&ctx->cq_timeouts) != iowq->nr_timeouts; |
6717 | } | |
6718 | ||
6719 | static int io_wake_function(struct wait_queue_entry *curr, unsigned int mode, | |
6720 | int wake_flags, void *key) | |
6721 | { | |
6722 | struct io_wait_queue *iowq = container_of(curr, struct io_wait_queue, | |
6723 | wq); | |
6724 | ||
1d7bb1d5 JA |
6725 | /* use noflush == true, as we can't safely rely on locking context */ |
6726 | if (!io_should_wake(iowq, true)) | |
bda52162 JA |
6727 | return -1; |
6728 | ||
6729 | return autoremove_wake_function(curr, mode, wake_flags, key); | |
6730 | } | |
6731 | ||
2b188cc1 JA |
6732 | /* |
6733 | * Wait until events become available, if we don't already have some. The | |
6734 | * application must reap them itself, as they reside on the shared cq ring. | |
6735 | */ | |
6736 | static int io_cqring_wait(struct io_ring_ctx *ctx, int min_events, | |
6737 | const sigset_t __user *sig, size_t sigsz) | |
6738 | { | |
bda52162 JA |
6739 | struct io_wait_queue iowq = { |
6740 | .wq = { | |
6741 | .private = current, | |
6742 | .func = io_wake_function, | |
6743 | .entry = LIST_HEAD_INIT(iowq.wq.entry), | |
6744 | }, | |
6745 | .ctx = ctx, | |
6746 | .to_wait = min_events, | |
6747 | }; | |
75b28aff | 6748 | struct io_rings *rings = ctx->rings; |
e9ffa5c2 | 6749 | int ret = 0; |
2b188cc1 | 6750 | |
b41e9852 JA |
6751 | do { |
6752 | if (io_cqring_events(ctx, false) >= min_events) | |
6753 | return 0; | |
4c6e277c | 6754 | if (!io_run_task_work()) |
b41e9852 | 6755 | break; |
b41e9852 | 6756 | } while (1); |
2b188cc1 JA |
6757 | |
6758 | if (sig) { | |
9e75ad5d AB |
6759 | #ifdef CONFIG_COMPAT |
6760 | if (in_compat_syscall()) | |
6761 | ret = set_compat_user_sigmask((const compat_sigset_t __user *)sig, | |
b772434b | 6762 | sigsz); |
9e75ad5d AB |
6763 | else |
6764 | #endif | |
b772434b | 6765 | ret = set_user_sigmask(sig, sigsz); |
9e75ad5d | 6766 | |
2b188cc1 JA |
6767 | if (ret) |
6768 | return ret; | |
6769 | } | |
6770 | ||
bda52162 | 6771 | iowq.nr_timeouts = atomic_read(&ctx->cq_timeouts); |
c826bd7a | 6772 | trace_io_uring_cqring_wait(ctx, min_events); |
bda52162 JA |
6773 | do { |
6774 | prepare_to_wait_exclusive(&ctx->wait, &iowq.wq, | |
6775 | TASK_INTERRUPTIBLE); | |
ce593a6c | 6776 | /* make sure we run task_work before checking for signals */ |
4c6e277c JA |
6777 | if (io_run_task_work()) |
6778 | continue; | |
bda52162 | 6779 | if (signal_pending(current)) { |
b7db41c9 JA |
6780 | if (current->jobctl & JOBCTL_TASK_WORK) { |
6781 | spin_lock_irq(¤t->sighand->siglock); | |
6782 | current->jobctl &= ~JOBCTL_TASK_WORK; | |
6783 | recalc_sigpending(); | |
6784 | spin_unlock_irq(¤t->sighand->siglock); | |
6785 | continue; | |
6786 | } | |
6787 | ret = -EINTR; | |
bda52162 JA |
6788 | break; |
6789 | } | |
ce593a6c JA |
6790 | if (io_should_wake(&iowq, false)) |
6791 | break; | |
6792 | schedule(); | |
bda52162 JA |
6793 | } while (1); |
6794 | finish_wait(&ctx->wait, &iowq.wq); | |
6795 | ||
b7db41c9 | 6796 | restore_saved_sigmask_unless(ret == -EINTR); |
2b188cc1 | 6797 | |
75b28aff | 6798 | return READ_ONCE(rings->cq.head) == READ_ONCE(rings->cq.tail) ? ret : 0; |
2b188cc1 JA |
6799 | } |
6800 | ||
6b06314c JA |
6801 | static void __io_sqe_files_unregister(struct io_ring_ctx *ctx) |
6802 | { | |
6803 | #if defined(CONFIG_UNIX) | |
6804 | if (ctx->ring_sock) { | |
6805 | struct sock *sock = ctx->ring_sock->sk; | |
6806 | struct sk_buff *skb; | |
6807 | ||
6808 | while ((skb = skb_dequeue(&sock->sk_receive_queue)) != NULL) | |
6809 | kfree_skb(skb); | |
6810 | } | |
6811 | #else | |
6812 | int i; | |
6813 | ||
65e19f54 JA |
6814 | for (i = 0; i < ctx->nr_user_files; i++) { |
6815 | struct file *file; | |
6816 | ||
6817 | file = io_file_from_index(ctx, i); | |
6818 | if (file) | |
6819 | fput(file); | |
6820 | } | |
6b06314c JA |
6821 | #endif |
6822 | } | |
6823 | ||
05f3fb3c JA |
6824 | static void io_file_ref_kill(struct percpu_ref *ref) |
6825 | { | |
6826 | struct fixed_file_data *data; | |
6827 | ||
6828 | data = container_of(ref, struct fixed_file_data, refs); | |
6829 | complete(&data->done); | |
6830 | } | |
6831 | ||
6b06314c JA |
6832 | static int io_sqe_files_unregister(struct io_ring_ctx *ctx) |
6833 | { | |
05f3fb3c | 6834 | struct fixed_file_data *data = ctx->file_data; |
05589553 | 6835 | struct fixed_file_ref_node *ref_node = NULL; |
65e19f54 JA |
6836 | unsigned nr_tables, i; |
6837 | ||
05f3fb3c | 6838 | if (!data) |
6b06314c JA |
6839 | return -ENXIO; |
6840 | ||
6a4d07cd | 6841 | spin_lock(&data->lock); |
05589553 XW |
6842 | if (!list_empty(&data->ref_list)) |
6843 | ref_node = list_first_entry(&data->ref_list, | |
6844 | struct fixed_file_ref_node, node); | |
6a4d07cd | 6845 | spin_unlock(&data->lock); |
05589553 XW |
6846 | if (ref_node) |
6847 | percpu_ref_kill(&ref_node->refs); | |
6848 | ||
6849 | percpu_ref_kill(&data->refs); | |
6850 | ||
6851 | /* wait for all refs nodes to complete */ | |
4a38aed2 | 6852 | flush_delayed_work(&ctx->file_put_work); |
2faf852d | 6853 | wait_for_completion(&data->done); |
05f3fb3c | 6854 | |
6b06314c | 6855 | __io_sqe_files_unregister(ctx); |
65e19f54 JA |
6856 | nr_tables = DIV_ROUND_UP(ctx->nr_user_files, IORING_MAX_FILES_TABLE); |
6857 | for (i = 0; i < nr_tables; i++) | |
05f3fb3c JA |
6858 | kfree(data->table[i].files); |
6859 | kfree(data->table); | |
05589553 XW |
6860 | percpu_ref_exit(&data->refs); |
6861 | kfree(data); | |
05f3fb3c | 6862 | ctx->file_data = NULL; |
6b06314c JA |
6863 | ctx->nr_user_files = 0; |
6864 | return 0; | |
6865 | } | |
6866 | ||
6c271ce2 JA |
6867 | static void io_sq_thread_stop(struct io_ring_ctx *ctx) |
6868 | { | |
6869 | if (ctx->sqo_thread) { | |
0f158b4c | 6870 | wait_for_completion(&ctx->sq_thread_comp); |
2bbcd6d3 RP |
6871 | /* |
6872 | * The park is a bit of a work-around, without it we get | |
6873 | * warning spews on shutdown with SQPOLL set and affinity | |
6874 | * set to a single CPU. | |
6875 | */ | |
06058632 | 6876 | kthread_park(ctx->sqo_thread); |
6c271ce2 JA |
6877 | kthread_stop(ctx->sqo_thread); |
6878 | ctx->sqo_thread = NULL; | |
6879 | } | |
6880 | } | |
6881 | ||
6b06314c JA |
6882 | static void io_finish_async(struct io_ring_ctx *ctx) |
6883 | { | |
6c271ce2 JA |
6884 | io_sq_thread_stop(ctx); |
6885 | ||
561fb04a JA |
6886 | if (ctx->io_wq) { |
6887 | io_wq_destroy(ctx->io_wq); | |
6888 | ctx->io_wq = NULL; | |
6b06314c JA |
6889 | } |
6890 | } | |
6891 | ||
6892 | #if defined(CONFIG_UNIX) | |
6b06314c JA |
6893 | /* |
6894 | * Ensure the UNIX gc is aware of our file set, so we are certain that | |
6895 | * the io_uring can be safely unregistered on process exit, even if we have | |
6896 | * loops in the file referencing. | |
6897 | */ | |
6898 | static int __io_sqe_files_scm(struct io_ring_ctx *ctx, int nr, int offset) | |
6899 | { | |
6900 | struct sock *sk = ctx->ring_sock->sk; | |
6901 | struct scm_fp_list *fpl; | |
6902 | struct sk_buff *skb; | |
08a45173 | 6903 | int i, nr_files; |
6b06314c | 6904 | |
6b06314c JA |
6905 | fpl = kzalloc(sizeof(*fpl), GFP_KERNEL); |
6906 | if (!fpl) | |
6907 | return -ENOMEM; | |
6908 | ||
6909 | skb = alloc_skb(0, GFP_KERNEL); | |
6910 | if (!skb) { | |
6911 | kfree(fpl); | |
6912 | return -ENOMEM; | |
6913 | } | |
6914 | ||
6915 | skb->sk = sk; | |
6b06314c | 6916 | |
08a45173 | 6917 | nr_files = 0; |
6b06314c JA |
6918 | fpl->user = get_uid(ctx->user); |
6919 | for (i = 0; i < nr; i++) { | |
65e19f54 JA |
6920 | struct file *file = io_file_from_index(ctx, i + offset); |
6921 | ||
6922 | if (!file) | |
08a45173 | 6923 | continue; |
65e19f54 | 6924 | fpl->fp[nr_files] = get_file(file); |
08a45173 JA |
6925 | unix_inflight(fpl->user, fpl->fp[nr_files]); |
6926 | nr_files++; | |
6b06314c JA |
6927 | } |
6928 | ||
08a45173 JA |
6929 | if (nr_files) { |
6930 | fpl->max = SCM_MAX_FD; | |
6931 | fpl->count = nr_files; | |
6932 | UNIXCB(skb).fp = fpl; | |
05f3fb3c | 6933 | skb->destructor = unix_destruct_scm; |
08a45173 JA |
6934 | refcount_add(skb->truesize, &sk->sk_wmem_alloc); |
6935 | skb_queue_head(&sk->sk_receive_queue, skb); | |
6b06314c | 6936 | |
08a45173 JA |
6937 | for (i = 0; i < nr_files; i++) |
6938 | fput(fpl->fp[i]); | |
6939 | } else { | |
6940 | kfree_skb(skb); | |
6941 | kfree(fpl); | |
6942 | } | |
6b06314c JA |
6943 | |
6944 | return 0; | |
6945 | } | |
6946 | ||
6947 | /* | |
6948 | * If UNIX sockets are enabled, fd passing can cause a reference cycle which | |
6949 | * causes regular reference counting to break down. We rely on the UNIX | |
6950 | * garbage collection to take care of this problem for us. | |
6951 | */ | |
6952 | static int io_sqe_files_scm(struct io_ring_ctx *ctx) | |
6953 | { | |
6954 | unsigned left, total; | |
6955 | int ret = 0; | |
6956 | ||
6957 | total = 0; | |
6958 | left = ctx->nr_user_files; | |
6959 | while (left) { | |
6960 | unsigned this_files = min_t(unsigned, left, SCM_MAX_FD); | |
6b06314c JA |
6961 | |
6962 | ret = __io_sqe_files_scm(ctx, this_files, total); | |
6963 | if (ret) | |
6964 | break; | |
6965 | left -= this_files; | |
6966 | total += this_files; | |
6967 | } | |
6968 | ||
6969 | if (!ret) | |
6970 | return 0; | |
6971 | ||
6972 | while (total < ctx->nr_user_files) { | |
65e19f54 JA |
6973 | struct file *file = io_file_from_index(ctx, total); |
6974 | ||
6975 | if (file) | |
6976 | fput(file); | |
6b06314c JA |
6977 | total++; |
6978 | } | |
6979 | ||
6980 | return ret; | |
6981 | } | |
6982 | #else | |
6983 | static int io_sqe_files_scm(struct io_ring_ctx *ctx) | |
6984 | { | |
6985 | return 0; | |
6986 | } | |
6987 | #endif | |
6988 | ||
65e19f54 JA |
6989 | static int io_sqe_alloc_file_tables(struct io_ring_ctx *ctx, unsigned nr_tables, |
6990 | unsigned nr_files) | |
6991 | { | |
6992 | int i; | |
6993 | ||
6994 | for (i = 0; i < nr_tables; i++) { | |
05f3fb3c | 6995 | struct fixed_file_table *table = &ctx->file_data->table[i]; |
65e19f54 JA |
6996 | unsigned this_files; |
6997 | ||
6998 | this_files = min(nr_files, IORING_MAX_FILES_TABLE); | |
6999 | table->files = kcalloc(this_files, sizeof(struct file *), | |
7000 | GFP_KERNEL); | |
7001 | if (!table->files) | |
7002 | break; | |
7003 | nr_files -= this_files; | |
7004 | } | |
7005 | ||
7006 | if (i == nr_tables) | |
7007 | return 0; | |
7008 | ||
7009 | for (i = 0; i < nr_tables; i++) { | |
05f3fb3c | 7010 | struct fixed_file_table *table = &ctx->file_data->table[i]; |
65e19f54 JA |
7011 | kfree(table->files); |
7012 | } | |
7013 | return 1; | |
7014 | } | |
7015 | ||
05f3fb3c JA |
7016 | static void io_ring_file_put(struct io_ring_ctx *ctx, struct file *file) |
7017 | { | |
7018 | #if defined(CONFIG_UNIX) | |
7019 | struct sock *sock = ctx->ring_sock->sk; | |
7020 | struct sk_buff_head list, *head = &sock->sk_receive_queue; | |
7021 | struct sk_buff *skb; | |
7022 | int i; | |
7023 | ||
7024 | __skb_queue_head_init(&list); | |
7025 | ||
7026 | /* | |
7027 | * Find the skb that holds this file in its SCM_RIGHTS. When found, | |
7028 | * remove this entry and rearrange the file array. | |
7029 | */ | |
7030 | skb = skb_dequeue(head); | |
7031 | while (skb) { | |
7032 | struct scm_fp_list *fp; | |
7033 | ||
7034 | fp = UNIXCB(skb).fp; | |
7035 | for (i = 0; i < fp->count; i++) { | |
7036 | int left; | |
7037 | ||
7038 | if (fp->fp[i] != file) | |
7039 | continue; | |
7040 | ||
7041 | unix_notinflight(fp->user, fp->fp[i]); | |
7042 | left = fp->count - 1 - i; | |
7043 | if (left) { | |
7044 | memmove(&fp->fp[i], &fp->fp[i + 1], | |
7045 | left * sizeof(struct file *)); | |
7046 | } | |
7047 | fp->count--; | |
7048 | if (!fp->count) { | |
7049 | kfree_skb(skb); | |
7050 | skb = NULL; | |
7051 | } else { | |
7052 | __skb_queue_tail(&list, skb); | |
7053 | } | |
7054 | fput(file); | |
7055 | file = NULL; | |
7056 | break; | |
7057 | } | |
7058 | ||
7059 | if (!file) | |
7060 | break; | |
7061 | ||
7062 | __skb_queue_tail(&list, skb); | |
7063 | ||
7064 | skb = skb_dequeue(head); | |
7065 | } | |
7066 | ||
7067 | if (skb_peek(&list)) { | |
7068 | spin_lock_irq(&head->lock); | |
7069 | while ((skb = __skb_dequeue(&list)) != NULL) | |
7070 | __skb_queue_tail(head, skb); | |
7071 | spin_unlock_irq(&head->lock); | |
7072 | } | |
7073 | #else | |
7074 | fput(file); | |
7075 | #endif | |
7076 | } | |
7077 | ||
7078 | struct io_file_put { | |
05589553 | 7079 | struct list_head list; |
05f3fb3c | 7080 | struct file *file; |
05f3fb3c JA |
7081 | }; |
7082 | ||
4a38aed2 | 7083 | static void __io_file_put_work(struct fixed_file_ref_node *ref_node) |
65e19f54 | 7084 | { |
4a38aed2 JA |
7085 | struct fixed_file_data *file_data = ref_node->file_data; |
7086 | struct io_ring_ctx *ctx = file_data->ctx; | |
05f3fb3c | 7087 | struct io_file_put *pfile, *tmp; |
05589553 XW |
7088 | |
7089 | list_for_each_entry_safe(pfile, tmp, &ref_node->file_list, list) { | |
6a4d07cd | 7090 | list_del(&pfile->list); |
05589553 XW |
7091 | io_ring_file_put(ctx, pfile->file); |
7092 | kfree(pfile); | |
65e19f54 | 7093 | } |
05589553 | 7094 | |
6a4d07cd JA |
7095 | spin_lock(&file_data->lock); |
7096 | list_del(&ref_node->node); | |
7097 | spin_unlock(&file_data->lock); | |
05589553 XW |
7098 | |
7099 | percpu_ref_exit(&ref_node->refs); | |
7100 | kfree(ref_node); | |
7101 | percpu_ref_put(&file_data->refs); | |
2faf852d | 7102 | } |
65e19f54 | 7103 | |
4a38aed2 JA |
7104 | static void io_file_put_work(struct work_struct *work) |
7105 | { | |
7106 | struct io_ring_ctx *ctx; | |
7107 | struct llist_node *node; | |
7108 | ||
7109 | ctx = container_of(work, struct io_ring_ctx, file_put_work.work); | |
7110 | node = llist_del_all(&ctx->file_put_llist); | |
7111 | ||
7112 | while (node) { | |
7113 | struct fixed_file_ref_node *ref_node; | |
7114 | struct llist_node *next = node->next; | |
7115 | ||
7116 | ref_node = llist_entry(node, struct fixed_file_ref_node, llist); | |
7117 | __io_file_put_work(ref_node); | |
7118 | node = next; | |
7119 | } | |
7120 | } | |
7121 | ||
05589553 | 7122 | static void io_file_data_ref_zero(struct percpu_ref *ref) |
2faf852d | 7123 | { |
05589553 | 7124 | struct fixed_file_ref_node *ref_node; |
4a38aed2 JA |
7125 | struct io_ring_ctx *ctx; |
7126 | bool first_add; | |
7127 | int delay = HZ; | |
65e19f54 | 7128 | |
05589553 | 7129 | ref_node = container_of(ref, struct fixed_file_ref_node, refs); |
4a38aed2 | 7130 | ctx = ref_node->file_data->ctx; |
05589553 | 7131 | |
4a38aed2 JA |
7132 | if (percpu_ref_is_dying(&ctx->file_data->refs)) |
7133 | delay = 0; | |
05589553 | 7134 | |
4a38aed2 JA |
7135 | first_add = llist_add(&ref_node->llist, &ctx->file_put_llist); |
7136 | if (!delay) | |
7137 | mod_delayed_work(system_wq, &ctx->file_put_work, 0); | |
7138 | else if (first_add) | |
7139 | queue_delayed_work(system_wq, &ctx->file_put_work, delay); | |
05f3fb3c | 7140 | } |
65e19f54 | 7141 | |
05589553 XW |
7142 | static struct fixed_file_ref_node *alloc_fixed_file_ref_node( |
7143 | struct io_ring_ctx *ctx) | |
05f3fb3c | 7144 | { |
05589553 | 7145 | struct fixed_file_ref_node *ref_node; |
05f3fb3c | 7146 | |
05589553 XW |
7147 | ref_node = kzalloc(sizeof(*ref_node), GFP_KERNEL); |
7148 | if (!ref_node) | |
7149 | return ERR_PTR(-ENOMEM); | |
05f3fb3c | 7150 | |
05589553 XW |
7151 | if (percpu_ref_init(&ref_node->refs, io_file_data_ref_zero, |
7152 | 0, GFP_KERNEL)) { | |
7153 | kfree(ref_node); | |
7154 | return ERR_PTR(-ENOMEM); | |
7155 | } | |
7156 | INIT_LIST_HEAD(&ref_node->node); | |
7157 | INIT_LIST_HEAD(&ref_node->file_list); | |
05589553 XW |
7158 | ref_node->file_data = ctx->file_data; |
7159 | return ref_node; | |
05589553 XW |
7160 | } |
7161 | ||
7162 | static void destroy_fixed_file_ref_node(struct fixed_file_ref_node *ref_node) | |
7163 | { | |
7164 | percpu_ref_exit(&ref_node->refs); | |
7165 | kfree(ref_node); | |
65e19f54 JA |
7166 | } |
7167 | ||
6b06314c JA |
7168 | static int io_sqe_files_register(struct io_ring_ctx *ctx, void __user *arg, |
7169 | unsigned nr_args) | |
7170 | { | |
7171 | __s32 __user *fds = (__s32 __user *) arg; | |
65e19f54 | 7172 | unsigned nr_tables; |
05f3fb3c | 7173 | struct file *file; |
6b06314c JA |
7174 | int fd, ret = 0; |
7175 | unsigned i; | |
05589553 | 7176 | struct fixed_file_ref_node *ref_node; |
6b06314c | 7177 | |
05f3fb3c | 7178 | if (ctx->file_data) |
6b06314c JA |
7179 | return -EBUSY; |
7180 | if (!nr_args) | |
7181 | return -EINVAL; | |
7182 | if (nr_args > IORING_MAX_FIXED_FILES) | |
7183 | return -EMFILE; | |
7184 | ||
05f3fb3c JA |
7185 | ctx->file_data = kzalloc(sizeof(*ctx->file_data), GFP_KERNEL); |
7186 | if (!ctx->file_data) | |
7187 | return -ENOMEM; | |
7188 | ctx->file_data->ctx = ctx; | |
7189 | init_completion(&ctx->file_data->done); | |
05589553 | 7190 | INIT_LIST_HEAD(&ctx->file_data->ref_list); |
f7fe9346 | 7191 | spin_lock_init(&ctx->file_data->lock); |
05f3fb3c | 7192 | |
65e19f54 | 7193 | nr_tables = DIV_ROUND_UP(nr_args, IORING_MAX_FILES_TABLE); |
05f3fb3c JA |
7194 | ctx->file_data->table = kcalloc(nr_tables, |
7195 | sizeof(struct fixed_file_table), | |
65e19f54 | 7196 | GFP_KERNEL); |
05f3fb3c JA |
7197 | if (!ctx->file_data->table) { |
7198 | kfree(ctx->file_data); | |
7199 | ctx->file_data = NULL; | |
6b06314c | 7200 | return -ENOMEM; |
05f3fb3c JA |
7201 | } |
7202 | ||
05589553 | 7203 | if (percpu_ref_init(&ctx->file_data->refs, io_file_ref_kill, |
05f3fb3c JA |
7204 | PERCPU_REF_ALLOW_REINIT, GFP_KERNEL)) { |
7205 | kfree(ctx->file_data->table); | |
7206 | kfree(ctx->file_data); | |
7207 | ctx->file_data = NULL; | |
6b06314c | 7208 | return -ENOMEM; |
05f3fb3c | 7209 | } |
6b06314c | 7210 | |
65e19f54 | 7211 | if (io_sqe_alloc_file_tables(ctx, nr_tables, nr_args)) { |
05f3fb3c JA |
7212 | percpu_ref_exit(&ctx->file_data->refs); |
7213 | kfree(ctx->file_data->table); | |
7214 | kfree(ctx->file_data); | |
7215 | ctx->file_data = NULL; | |
65e19f54 JA |
7216 | return -ENOMEM; |
7217 | } | |
7218 | ||
08a45173 | 7219 | for (i = 0; i < nr_args; i++, ctx->nr_user_files++) { |
65e19f54 JA |
7220 | struct fixed_file_table *table; |
7221 | unsigned index; | |
7222 | ||
6b06314c JA |
7223 | ret = -EFAULT; |
7224 | if (copy_from_user(&fd, &fds[i], sizeof(fd))) | |
7225 | break; | |
08a45173 JA |
7226 | /* allow sparse sets */ |
7227 | if (fd == -1) { | |
7228 | ret = 0; | |
7229 | continue; | |
7230 | } | |
6b06314c | 7231 | |
05f3fb3c | 7232 | table = &ctx->file_data->table[i >> IORING_FILE_TABLE_SHIFT]; |
65e19f54 | 7233 | index = i & IORING_FILE_TABLE_MASK; |
05f3fb3c | 7234 | file = fget(fd); |
6b06314c JA |
7235 | |
7236 | ret = -EBADF; | |
05f3fb3c | 7237 | if (!file) |
6b06314c | 7238 | break; |
05f3fb3c | 7239 | |
6b06314c JA |
7240 | /* |
7241 | * Don't allow io_uring instances to be registered. If UNIX | |
7242 | * isn't enabled, then this causes a reference cycle and this | |
7243 | * instance can never get freed. If UNIX is enabled we'll | |
7244 | * handle it just fine, but there's still no point in allowing | |
7245 | * a ring fd as it doesn't support regular read/write anyway. | |
7246 | */ | |
05f3fb3c JA |
7247 | if (file->f_op == &io_uring_fops) { |
7248 | fput(file); | |
6b06314c JA |
7249 | break; |
7250 | } | |
6b06314c | 7251 | ret = 0; |
05f3fb3c | 7252 | table->files[index] = file; |
6b06314c JA |
7253 | } |
7254 | ||
7255 | if (ret) { | |
65e19f54 | 7256 | for (i = 0; i < ctx->nr_user_files; i++) { |
65e19f54 JA |
7257 | file = io_file_from_index(ctx, i); |
7258 | if (file) | |
7259 | fput(file); | |
7260 | } | |
7261 | for (i = 0; i < nr_tables; i++) | |
05f3fb3c | 7262 | kfree(ctx->file_data->table[i].files); |
6b06314c | 7263 | |
667e57da | 7264 | percpu_ref_exit(&ctx->file_data->refs); |
05f3fb3c JA |
7265 | kfree(ctx->file_data->table); |
7266 | kfree(ctx->file_data); | |
7267 | ctx->file_data = NULL; | |
6b06314c JA |
7268 | ctx->nr_user_files = 0; |
7269 | return ret; | |
7270 | } | |
7271 | ||
7272 | ret = io_sqe_files_scm(ctx); | |
05589553 | 7273 | if (ret) { |
6b06314c | 7274 | io_sqe_files_unregister(ctx); |
05589553 XW |
7275 | return ret; |
7276 | } | |
6b06314c | 7277 | |
05589553 XW |
7278 | ref_node = alloc_fixed_file_ref_node(ctx); |
7279 | if (IS_ERR(ref_node)) { | |
7280 | io_sqe_files_unregister(ctx); | |
7281 | return PTR_ERR(ref_node); | |
7282 | } | |
7283 | ||
7284 | ctx->file_data->cur_refs = &ref_node->refs; | |
6a4d07cd | 7285 | spin_lock(&ctx->file_data->lock); |
05589553 | 7286 | list_add(&ref_node->node, &ctx->file_data->ref_list); |
6a4d07cd | 7287 | spin_unlock(&ctx->file_data->lock); |
05589553 | 7288 | percpu_ref_get(&ctx->file_data->refs); |
6b06314c JA |
7289 | return ret; |
7290 | } | |
7291 | ||
c3a31e60 JA |
7292 | static int io_sqe_file_register(struct io_ring_ctx *ctx, struct file *file, |
7293 | int index) | |
7294 | { | |
7295 | #if defined(CONFIG_UNIX) | |
7296 | struct sock *sock = ctx->ring_sock->sk; | |
7297 | struct sk_buff_head *head = &sock->sk_receive_queue; | |
7298 | struct sk_buff *skb; | |
7299 | ||
7300 | /* | |
7301 | * See if we can merge this file into an existing skb SCM_RIGHTS | |
7302 | * file set. If there's no room, fall back to allocating a new skb | |
7303 | * and filling it in. | |
7304 | */ | |
7305 | spin_lock_irq(&head->lock); | |
7306 | skb = skb_peek(head); | |
7307 | if (skb) { | |
7308 | struct scm_fp_list *fpl = UNIXCB(skb).fp; | |
7309 | ||
7310 | if (fpl->count < SCM_MAX_FD) { | |
7311 | __skb_unlink(skb, head); | |
7312 | spin_unlock_irq(&head->lock); | |
7313 | fpl->fp[fpl->count] = get_file(file); | |
7314 | unix_inflight(fpl->user, fpl->fp[fpl->count]); | |
7315 | fpl->count++; | |
7316 | spin_lock_irq(&head->lock); | |
7317 | __skb_queue_head(head, skb); | |
7318 | } else { | |
7319 | skb = NULL; | |
7320 | } | |
7321 | } | |
7322 | spin_unlock_irq(&head->lock); | |
7323 | ||
7324 | if (skb) { | |
7325 | fput(file); | |
7326 | return 0; | |
7327 | } | |
7328 | ||
7329 | return __io_sqe_files_scm(ctx, 1, index); | |
7330 | #else | |
7331 | return 0; | |
7332 | #endif | |
7333 | } | |
7334 | ||
a5318d3c | 7335 | static int io_queue_file_removal(struct fixed_file_data *data, |
05589553 | 7336 | struct file *file) |
05f3fb3c | 7337 | { |
a5318d3c | 7338 | struct io_file_put *pfile; |
05589553 XW |
7339 | struct percpu_ref *refs = data->cur_refs; |
7340 | struct fixed_file_ref_node *ref_node; | |
05f3fb3c | 7341 | |
05f3fb3c | 7342 | pfile = kzalloc(sizeof(*pfile), GFP_KERNEL); |
a5318d3c HD |
7343 | if (!pfile) |
7344 | return -ENOMEM; | |
05f3fb3c | 7345 | |
05589553 | 7346 | ref_node = container_of(refs, struct fixed_file_ref_node, refs); |
05f3fb3c | 7347 | pfile->file = file; |
05589553 XW |
7348 | list_add(&pfile->list, &ref_node->file_list); |
7349 | ||
a5318d3c | 7350 | return 0; |
05f3fb3c JA |
7351 | } |
7352 | ||
7353 | static int __io_sqe_files_update(struct io_ring_ctx *ctx, | |
7354 | struct io_uring_files_update *up, | |
7355 | unsigned nr_args) | |
7356 | { | |
7357 | struct fixed_file_data *data = ctx->file_data; | |
05589553 | 7358 | struct fixed_file_ref_node *ref_node; |
05f3fb3c | 7359 | struct file *file; |
c3a31e60 JA |
7360 | __s32 __user *fds; |
7361 | int fd, i, err; | |
7362 | __u32 done; | |
05589553 | 7363 | bool needs_switch = false; |
c3a31e60 | 7364 | |
05f3fb3c | 7365 | if (check_add_overflow(up->offset, nr_args, &done)) |
c3a31e60 JA |
7366 | return -EOVERFLOW; |
7367 | if (done > ctx->nr_user_files) | |
7368 | return -EINVAL; | |
7369 | ||
05589553 XW |
7370 | ref_node = alloc_fixed_file_ref_node(ctx); |
7371 | if (IS_ERR(ref_node)) | |
7372 | return PTR_ERR(ref_node); | |
7373 | ||
c3a31e60 | 7374 | done = 0; |
05f3fb3c | 7375 | fds = u64_to_user_ptr(up->fds); |
c3a31e60 | 7376 | while (nr_args) { |
65e19f54 JA |
7377 | struct fixed_file_table *table; |
7378 | unsigned index; | |
7379 | ||
c3a31e60 JA |
7380 | err = 0; |
7381 | if (copy_from_user(&fd, &fds[done], sizeof(fd))) { | |
7382 | err = -EFAULT; | |
7383 | break; | |
7384 | } | |
05f3fb3c JA |
7385 | i = array_index_nospec(up->offset, ctx->nr_user_files); |
7386 | table = &ctx->file_data->table[i >> IORING_FILE_TABLE_SHIFT]; | |
65e19f54 JA |
7387 | index = i & IORING_FILE_TABLE_MASK; |
7388 | if (table->files[index]) { | |
98dfd502 | 7389 | file = table->files[index]; |
a5318d3c HD |
7390 | err = io_queue_file_removal(data, file); |
7391 | if (err) | |
7392 | break; | |
65e19f54 | 7393 | table->files[index] = NULL; |
05589553 | 7394 | needs_switch = true; |
c3a31e60 JA |
7395 | } |
7396 | if (fd != -1) { | |
c3a31e60 JA |
7397 | file = fget(fd); |
7398 | if (!file) { | |
7399 | err = -EBADF; | |
7400 | break; | |
7401 | } | |
7402 | /* | |
7403 | * Don't allow io_uring instances to be registered. If | |
7404 | * UNIX isn't enabled, then this causes a reference | |
7405 | * cycle and this instance can never get freed. If UNIX | |
7406 | * is enabled we'll handle it just fine, but there's | |
7407 | * still no point in allowing a ring fd as it doesn't | |
7408 | * support regular read/write anyway. | |
7409 | */ | |
7410 | if (file->f_op == &io_uring_fops) { | |
7411 | fput(file); | |
7412 | err = -EBADF; | |
7413 | break; | |
7414 | } | |
65e19f54 | 7415 | table->files[index] = file; |
c3a31e60 | 7416 | err = io_sqe_file_register(ctx, file, i); |
f3bd9dae | 7417 | if (err) { |
95d1c8e5 | 7418 | table->files[index] = NULL; |
f3bd9dae | 7419 | fput(file); |
c3a31e60 | 7420 | break; |
f3bd9dae | 7421 | } |
c3a31e60 JA |
7422 | } |
7423 | nr_args--; | |
7424 | done++; | |
05f3fb3c JA |
7425 | up->offset++; |
7426 | } | |
7427 | ||
05589553 XW |
7428 | if (needs_switch) { |
7429 | percpu_ref_kill(data->cur_refs); | |
6a4d07cd | 7430 | spin_lock(&data->lock); |
05589553 XW |
7431 | list_add(&ref_node->node, &data->ref_list); |
7432 | data->cur_refs = &ref_node->refs; | |
6a4d07cd | 7433 | spin_unlock(&data->lock); |
05589553 XW |
7434 | percpu_ref_get(&ctx->file_data->refs); |
7435 | } else | |
7436 | destroy_fixed_file_ref_node(ref_node); | |
c3a31e60 JA |
7437 | |
7438 | return done ? done : err; | |
7439 | } | |
05589553 | 7440 | |
05f3fb3c JA |
7441 | static int io_sqe_files_update(struct io_ring_ctx *ctx, void __user *arg, |
7442 | unsigned nr_args) | |
7443 | { | |
7444 | struct io_uring_files_update up; | |
7445 | ||
7446 | if (!ctx->file_data) | |
7447 | return -ENXIO; | |
7448 | if (!nr_args) | |
7449 | return -EINVAL; | |
7450 | if (copy_from_user(&up, arg, sizeof(up))) | |
7451 | return -EFAULT; | |
7452 | if (up.resv) | |
7453 | return -EINVAL; | |
7454 | ||
7455 | return __io_sqe_files_update(ctx, &up, nr_args); | |
7456 | } | |
c3a31e60 | 7457 | |
e9fd9396 | 7458 | static void io_free_work(struct io_wq_work *work) |
7d723065 JA |
7459 | { |
7460 | struct io_kiocb *req = container_of(work, struct io_kiocb, work); | |
7461 | ||
e9fd9396 | 7462 | /* Consider that io_steal_work() relies on this ref */ |
7d723065 JA |
7463 | io_put_req(req); |
7464 | } | |
7465 | ||
24369c2e PB |
7466 | static int io_init_wq_offload(struct io_ring_ctx *ctx, |
7467 | struct io_uring_params *p) | |
7468 | { | |
7469 | struct io_wq_data data; | |
7470 | struct fd f; | |
7471 | struct io_ring_ctx *ctx_attach; | |
7472 | unsigned int concurrency; | |
7473 | int ret = 0; | |
7474 | ||
7475 | data.user = ctx->user; | |
e9fd9396 | 7476 | data.free_work = io_free_work; |
f5fa38c5 | 7477 | data.do_work = io_wq_submit_work; |
24369c2e PB |
7478 | |
7479 | if (!(p->flags & IORING_SETUP_ATTACH_WQ)) { | |
7480 | /* Do QD, or 4 * CPUS, whatever is smallest */ | |
7481 | concurrency = min(ctx->sq_entries, 4 * num_online_cpus()); | |
7482 | ||
7483 | ctx->io_wq = io_wq_create(concurrency, &data); | |
7484 | if (IS_ERR(ctx->io_wq)) { | |
7485 | ret = PTR_ERR(ctx->io_wq); | |
7486 | ctx->io_wq = NULL; | |
7487 | } | |
7488 | return ret; | |
7489 | } | |
7490 | ||
7491 | f = fdget(p->wq_fd); | |
7492 | if (!f.file) | |
7493 | return -EBADF; | |
7494 | ||
7495 | if (f.file->f_op != &io_uring_fops) { | |
7496 | ret = -EINVAL; | |
7497 | goto out_fput; | |
7498 | } | |
7499 | ||
7500 | ctx_attach = f.file->private_data; | |
7501 | /* @io_wq is protected by holding the fd */ | |
7502 | if (!io_wq_get(ctx_attach->io_wq, &data)) { | |
7503 | ret = -EINVAL; | |
7504 | goto out_fput; | |
7505 | } | |
7506 | ||
7507 | ctx->io_wq = ctx_attach->io_wq; | |
7508 | out_fput: | |
7509 | fdput(f); | |
7510 | return ret; | |
7511 | } | |
7512 | ||
0f212204 JA |
7513 | static int io_uring_alloc_task_context(struct task_struct *task) |
7514 | { | |
7515 | struct io_uring_task *tctx; | |
7516 | ||
7517 | tctx = kmalloc(sizeof(*tctx), GFP_KERNEL); | |
7518 | if (unlikely(!tctx)) | |
7519 | return -ENOMEM; | |
7520 | ||
7521 | xa_init(&tctx->xa); | |
7522 | init_waitqueue_head(&tctx->wait); | |
7523 | tctx->last = NULL; | |
7524 | tctx->in_idle = 0; | |
7525 | atomic_long_set(&tctx->req_issue, 0); | |
7526 | atomic_long_set(&tctx->req_complete, 0); | |
7527 | task->io_uring = tctx; | |
7528 | return 0; | |
7529 | } | |
7530 | ||
7531 | void __io_uring_free(struct task_struct *tsk) | |
7532 | { | |
7533 | struct io_uring_task *tctx = tsk->io_uring; | |
7534 | ||
7535 | WARN_ON_ONCE(!xa_empty(&tctx->xa)); | |
7536 | xa_destroy(&tctx->xa); | |
7537 | kfree(tctx); | |
7538 | tsk->io_uring = NULL; | |
7539 | } | |
7540 | ||
6c271ce2 JA |
7541 | static int io_sq_offload_start(struct io_ring_ctx *ctx, |
7542 | struct io_uring_params *p) | |
2b188cc1 JA |
7543 | { |
7544 | int ret; | |
7545 | ||
6c271ce2 | 7546 | if (ctx->flags & IORING_SETUP_SQPOLL) { |
3ec482d1 JA |
7547 | ret = -EPERM; |
7548 | if (!capable(CAP_SYS_ADMIN)) | |
7549 | goto err; | |
7550 | ||
917257da JA |
7551 | ctx->sq_thread_idle = msecs_to_jiffies(p->sq_thread_idle); |
7552 | if (!ctx->sq_thread_idle) | |
7553 | ctx->sq_thread_idle = HZ; | |
7554 | ||
6c271ce2 | 7555 | if (p->flags & IORING_SETUP_SQ_AFF) { |
44a9bd18 | 7556 | int cpu = p->sq_thread_cpu; |
6c271ce2 | 7557 | |
917257da | 7558 | ret = -EINVAL; |
44a9bd18 JA |
7559 | if (cpu >= nr_cpu_ids) |
7560 | goto err; | |
7889f44d | 7561 | if (!cpu_online(cpu)) |
917257da JA |
7562 | goto err; |
7563 | ||
6c271ce2 JA |
7564 | ctx->sqo_thread = kthread_create_on_cpu(io_sq_thread, |
7565 | ctx, cpu, | |
7566 | "io_uring-sq"); | |
7567 | } else { | |
7568 | ctx->sqo_thread = kthread_create(io_sq_thread, ctx, | |
7569 | "io_uring-sq"); | |
7570 | } | |
7571 | if (IS_ERR(ctx->sqo_thread)) { | |
7572 | ret = PTR_ERR(ctx->sqo_thread); | |
7573 | ctx->sqo_thread = NULL; | |
7574 | goto err; | |
7575 | } | |
0f212204 JA |
7576 | ret = io_uring_alloc_task_context(ctx->sqo_thread); |
7577 | if (ret) | |
7578 | goto err; | |
6c271ce2 JA |
7579 | wake_up_process(ctx->sqo_thread); |
7580 | } else if (p->flags & IORING_SETUP_SQ_AFF) { | |
7581 | /* Can't have SQ_AFF without SQPOLL */ | |
7582 | ret = -EINVAL; | |
7583 | goto err; | |
7584 | } | |
7585 | ||
24369c2e PB |
7586 | ret = io_init_wq_offload(ctx, p); |
7587 | if (ret) | |
2b188cc1 | 7588 | goto err; |
2b188cc1 JA |
7589 | |
7590 | return 0; | |
7591 | err: | |
54a91f3b | 7592 | io_finish_async(ctx); |
2b188cc1 JA |
7593 | return ret; |
7594 | } | |
7595 | ||
a087e2b5 BM |
7596 | static inline void __io_unaccount_mem(struct user_struct *user, |
7597 | unsigned long nr_pages) | |
2b188cc1 JA |
7598 | { |
7599 | atomic_long_sub(nr_pages, &user->locked_vm); | |
7600 | } | |
7601 | ||
a087e2b5 BM |
7602 | static inline int __io_account_mem(struct user_struct *user, |
7603 | unsigned long nr_pages) | |
2b188cc1 JA |
7604 | { |
7605 | unsigned long page_limit, cur_pages, new_pages; | |
7606 | ||
7607 | /* Don't allow more pages than we can safely lock */ | |
7608 | page_limit = rlimit(RLIMIT_MEMLOCK) >> PAGE_SHIFT; | |
7609 | ||
7610 | do { | |
7611 | cur_pages = atomic_long_read(&user->locked_vm); | |
7612 | new_pages = cur_pages + nr_pages; | |
7613 | if (new_pages > page_limit) | |
7614 | return -ENOMEM; | |
7615 | } while (atomic_long_cmpxchg(&user->locked_vm, cur_pages, | |
7616 | new_pages) != cur_pages); | |
7617 | ||
7618 | return 0; | |
7619 | } | |
7620 | ||
2e0464d4 BM |
7621 | static void io_unaccount_mem(struct io_ring_ctx *ctx, unsigned long nr_pages, |
7622 | enum io_mem_account acct) | |
a087e2b5 | 7623 | { |
aad5d8da | 7624 | if (ctx->limit_mem) |
a087e2b5 | 7625 | __io_unaccount_mem(ctx->user, nr_pages); |
30975825 | 7626 | |
2aede0e4 | 7627 | if (ctx->mm_account) { |
2e0464d4 | 7628 | if (acct == ACCT_LOCKED) |
2aede0e4 | 7629 | ctx->mm_account->locked_vm -= nr_pages; |
2e0464d4 | 7630 | else if (acct == ACCT_PINNED) |
2aede0e4 | 7631 | atomic64_sub(nr_pages, &ctx->mm_account->pinned_vm); |
2e0464d4 | 7632 | } |
a087e2b5 BM |
7633 | } |
7634 | ||
2e0464d4 BM |
7635 | static int io_account_mem(struct io_ring_ctx *ctx, unsigned long nr_pages, |
7636 | enum io_mem_account acct) | |
a087e2b5 | 7637 | { |
30975825 BM |
7638 | int ret; |
7639 | ||
7640 | if (ctx->limit_mem) { | |
7641 | ret = __io_account_mem(ctx->user, nr_pages); | |
7642 | if (ret) | |
7643 | return ret; | |
7644 | } | |
7645 | ||
2aede0e4 | 7646 | if (ctx->mm_account) { |
2e0464d4 | 7647 | if (acct == ACCT_LOCKED) |
2aede0e4 | 7648 | ctx->mm_account->locked_vm += nr_pages; |
2e0464d4 | 7649 | else if (acct == ACCT_PINNED) |
2aede0e4 | 7650 | atomic64_add(nr_pages, &ctx->mm_account->pinned_vm); |
2e0464d4 | 7651 | } |
a087e2b5 BM |
7652 | |
7653 | return 0; | |
7654 | } | |
7655 | ||
2b188cc1 JA |
7656 | static void io_mem_free(void *ptr) |
7657 | { | |
52e04ef4 MR |
7658 | struct page *page; |
7659 | ||
7660 | if (!ptr) | |
7661 | return; | |
2b188cc1 | 7662 | |
52e04ef4 | 7663 | page = virt_to_head_page(ptr); |
2b188cc1 JA |
7664 | if (put_page_testzero(page)) |
7665 | free_compound_page(page); | |
7666 | } | |
7667 | ||
7668 | static void *io_mem_alloc(size_t size) | |
7669 | { | |
7670 | gfp_t gfp_flags = GFP_KERNEL | __GFP_ZERO | __GFP_NOWARN | __GFP_COMP | | |
7671 | __GFP_NORETRY; | |
7672 | ||
7673 | return (void *) __get_free_pages(gfp_flags, get_order(size)); | |
7674 | } | |
7675 | ||
75b28aff HV |
7676 | static unsigned long rings_size(unsigned sq_entries, unsigned cq_entries, |
7677 | size_t *sq_offset) | |
7678 | { | |
7679 | struct io_rings *rings; | |
7680 | size_t off, sq_array_size; | |
7681 | ||
7682 | off = struct_size(rings, cqes, cq_entries); | |
7683 | if (off == SIZE_MAX) | |
7684 | return SIZE_MAX; | |
7685 | ||
7686 | #ifdef CONFIG_SMP | |
7687 | off = ALIGN(off, SMP_CACHE_BYTES); | |
7688 | if (off == 0) | |
7689 | return SIZE_MAX; | |
7690 | #endif | |
7691 | ||
b36200f5 DV |
7692 | if (sq_offset) |
7693 | *sq_offset = off; | |
7694 | ||
75b28aff HV |
7695 | sq_array_size = array_size(sizeof(u32), sq_entries); |
7696 | if (sq_array_size == SIZE_MAX) | |
7697 | return SIZE_MAX; | |
7698 | ||
7699 | if (check_add_overflow(off, sq_array_size, &off)) | |
7700 | return SIZE_MAX; | |
7701 | ||
75b28aff HV |
7702 | return off; |
7703 | } | |
7704 | ||
2b188cc1 JA |
7705 | static unsigned long ring_pages(unsigned sq_entries, unsigned cq_entries) |
7706 | { | |
75b28aff | 7707 | size_t pages; |
2b188cc1 | 7708 | |
75b28aff HV |
7709 | pages = (size_t)1 << get_order( |
7710 | rings_size(sq_entries, cq_entries, NULL)); | |
7711 | pages += (size_t)1 << get_order( | |
7712 | array_size(sizeof(struct io_uring_sqe), sq_entries)); | |
2b188cc1 | 7713 | |
75b28aff | 7714 | return pages; |
2b188cc1 JA |
7715 | } |
7716 | ||
edafccee JA |
7717 | static int io_sqe_buffer_unregister(struct io_ring_ctx *ctx) |
7718 | { | |
7719 | int i, j; | |
7720 | ||
7721 | if (!ctx->user_bufs) | |
7722 | return -ENXIO; | |
7723 | ||
7724 | for (i = 0; i < ctx->nr_user_bufs; i++) { | |
7725 | struct io_mapped_ubuf *imu = &ctx->user_bufs[i]; | |
7726 | ||
7727 | for (j = 0; j < imu->nr_bvecs; j++) | |
f1f6a7dd | 7728 | unpin_user_page(imu->bvec[j].bv_page); |
edafccee | 7729 | |
2e0464d4 | 7730 | io_unaccount_mem(ctx, imu->nr_bvecs, ACCT_PINNED); |
d4ef6475 | 7731 | kvfree(imu->bvec); |
edafccee JA |
7732 | imu->nr_bvecs = 0; |
7733 | } | |
7734 | ||
7735 | kfree(ctx->user_bufs); | |
7736 | ctx->user_bufs = NULL; | |
7737 | ctx->nr_user_bufs = 0; | |
7738 | return 0; | |
7739 | } | |
7740 | ||
7741 | static int io_copy_iov(struct io_ring_ctx *ctx, struct iovec *dst, | |
7742 | void __user *arg, unsigned index) | |
7743 | { | |
7744 | struct iovec __user *src; | |
7745 | ||
7746 | #ifdef CONFIG_COMPAT | |
7747 | if (ctx->compat) { | |
7748 | struct compat_iovec __user *ciovs; | |
7749 | struct compat_iovec ciov; | |
7750 | ||
7751 | ciovs = (struct compat_iovec __user *) arg; | |
7752 | if (copy_from_user(&ciov, &ciovs[index], sizeof(ciov))) | |
7753 | return -EFAULT; | |
7754 | ||
d55e5f5b | 7755 | dst->iov_base = u64_to_user_ptr((u64)ciov.iov_base); |
edafccee JA |
7756 | dst->iov_len = ciov.iov_len; |
7757 | return 0; | |
7758 | } | |
7759 | #endif | |
7760 | src = (struct iovec __user *) arg; | |
7761 | if (copy_from_user(dst, &src[index], sizeof(*dst))) | |
7762 | return -EFAULT; | |
7763 | return 0; | |
7764 | } | |
7765 | ||
7766 | static int io_sqe_buffer_register(struct io_ring_ctx *ctx, void __user *arg, | |
7767 | unsigned nr_args) | |
7768 | { | |
7769 | struct vm_area_struct **vmas = NULL; | |
7770 | struct page **pages = NULL; | |
7771 | int i, j, got_pages = 0; | |
7772 | int ret = -EINVAL; | |
7773 | ||
7774 | if (ctx->user_bufs) | |
7775 | return -EBUSY; | |
7776 | if (!nr_args || nr_args > UIO_MAXIOV) | |
7777 | return -EINVAL; | |
7778 | ||
7779 | ctx->user_bufs = kcalloc(nr_args, sizeof(struct io_mapped_ubuf), | |
7780 | GFP_KERNEL); | |
7781 | if (!ctx->user_bufs) | |
7782 | return -ENOMEM; | |
7783 | ||
7784 | for (i = 0; i < nr_args; i++) { | |
7785 | struct io_mapped_ubuf *imu = &ctx->user_bufs[i]; | |
7786 | unsigned long off, start, end, ubuf; | |
7787 | int pret, nr_pages; | |
7788 | struct iovec iov; | |
7789 | size_t size; | |
7790 | ||
7791 | ret = io_copy_iov(ctx, &iov, arg, i); | |
7792 | if (ret) | |
a278682d | 7793 | goto err; |
edafccee JA |
7794 | |
7795 | /* | |
7796 | * Don't impose further limits on the size and buffer | |
7797 | * constraints here, we'll -EINVAL later when IO is | |
7798 | * submitted if they are wrong. | |
7799 | */ | |
7800 | ret = -EFAULT; | |
7801 | if (!iov.iov_base || !iov.iov_len) | |
7802 | goto err; | |
7803 | ||
7804 | /* arbitrary limit, but we need something */ | |
7805 | if (iov.iov_len > SZ_1G) | |
7806 | goto err; | |
7807 | ||
7808 | ubuf = (unsigned long) iov.iov_base; | |
7809 | end = (ubuf + iov.iov_len + PAGE_SIZE - 1) >> PAGE_SHIFT; | |
7810 | start = ubuf >> PAGE_SHIFT; | |
7811 | nr_pages = end - start; | |
7812 | ||
2e0464d4 | 7813 | ret = io_account_mem(ctx, nr_pages, ACCT_PINNED); |
a087e2b5 BM |
7814 | if (ret) |
7815 | goto err; | |
edafccee JA |
7816 | |
7817 | ret = 0; | |
7818 | if (!pages || nr_pages > got_pages) { | |
a8c73c1a DE |
7819 | kvfree(vmas); |
7820 | kvfree(pages); | |
d4ef6475 | 7821 | pages = kvmalloc_array(nr_pages, sizeof(struct page *), |
edafccee | 7822 | GFP_KERNEL); |
d4ef6475 | 7823 | vmas = kvmalloc_array(nr_pages, |
edafccee JA |
7824 | sizeof(struct vm_area_struct *), |
7825 | GFP_KERNEL); | |
7826 | if (!pages || !vmas) { | |
7827 | ret = -ENOMEM; | |
2e0464d4 | 7828 | io_unaccount_mem(ctx, nr_pages, ACCT_PINNED); |
edafccee JA |
7829 | goto err; |
7830 | } | |
7831 | got_pages = nr_pages; | |
7832 | } | |
7833 | ||
d4ef6475 | 7834 | imu->bvec = kvmalloc_array(nr_pages, sizeof(struct bio_vec), |
edafccee JA |
7835 | GFP_KERNEL); |
7836 | ret = -ENOMEM; | |
7837 | if (!imu->bvec) { | |
2e0464d4 | 7838 | io_unaccount_mem(ctx, nr_pages, ACCT_PINNED); |
edafccee JA |
7839 | goto err; |
7840 | } | |
7841 | ||
7842 | ret = 0; | |
d8ed45c5 | 7843 | mmap_read_lock(current->mm); |
2113b05d | 7844 | pret = pin_user_pages(ubuf, nr_pages, |
932f4a63 IW |
7845 | FOLL_WRITE | FOLL_LONGTERM, |
7846 | pages, vmas); | |
edafccee JA |
7847 | if (pret == nr_pages) { |
7848 | /* don't support file backed memory */ | |
7849 | for (j = 0; j < nr_pages; j++) { | |
7850 | struct vm_area_struct *vma = vmas[j]; | |
7851 | ||
7852 | if (vma->vm_file && | |
7853 | !is_file_hugepages(vma->vm_file)) { | |
7854 | ret = -EOPNOTSUPP; | |
7855 | break; | |
7856 | } | |
7857 | } | |
7858 | } else { | |
7859 | ret = pret < 0 ? pret : -EFAULT; | |
7860 | } | |
d8ed45c5 | 7861 | mmap_read_unlock(current->mm); |
edafccee JA |
7862 | if (ret) { |
7863 | /* | |
7864 | * if we did partial map, or found file backed vmas, | |
7865 | * release any pages we did get | |
7866 | */ | |
27c4d3a3 | 7867 | if (pret > 0) |
f1f6a7dd | 7868 | unpin_user_pages(pages, pret); |
2e0464d4 | 7869 | io_unaccount_mem(ctx, nr_pages, ACCT_PINNED); |
d4ef6475 | 7870 | kvfree(imu->bvec); |
edafccee JA |
7871 | goto err; |
7872 | } | |
7873 | ||
7874 | off = ubuf & ~PAGE_MASK; | |
7875 | size = iov.iov_len; | |
7876 | for (j = 0; j < nr_pages; j++) { | |
7877 | size_t vec_len; | |
7878 | ||
7879 | vec_len = min_t(size_t, size, PAGE_SIZE - off); | |
7880 | imu->bvec[j].bv_page = pages[j]; | |
7881 | imu->bvec[j].bv_len = vec_len; | |
7882 | imu->bvec[j].bv_offset = off; | |
7883 | off = 0; | |
7884 | size -= vec_len; | |
7885 | } | |
7886 | /* store original address for later verification */ | |
7887 | imu->ubuf = ubuf; | |
7888 | imu->len = iov.iov_len; | |
7889 | imu->nr_bvecs = nr_pages; | |
7890 | ||
7891 | ctx->nr_user_bufs++; | |
7892 | } | |
d4ef6475 MR |
7893 | kvfree(pages); |
7894 | kvfree(vmas); | |
edafccee JA |
7895 | return 0; |
7896 | err: | |
d4ef6475 MR |
7897 | kvfree(pages); |
7898 | kvfree(vmas); | |
edafccee JA |
7899 | io_sqe_buffer_unregister(ctx); |
7900 | return ret; | |
7901 | } | |
7902 | ||
9b402849 JA |
7903 | static int io_eventfd_register(struct io_ring_ctx *ctx, void __user *arg) |
7904 | { | |
7905 | __s32 __user *fds = arg; | |
7906 | int fd; | |
7907 | ||
7908 | if (ctx->cq_ev_fd) | |
7909 | return -EBUSY; | |
7910 | ||
7911 | if (copy_from_user(&fd, fds, sizeof(*fds))) | |
7912 | return -EFAULT; | |
7913 | ||
7914 | ctx->cq_ev_fd = eventfd_ctx_fdget(fd); | |
7915 | if (IS_ERR(ctx->cq_ev_fd)) { | |
7916 | int ret = PTR_ERR(ctx->cq_ev_fd); | |
7917 | ctx->cq_ev_fd = NULL; | |
7918 | return ret; | |
7919 | } | |
7920 | ||
7921 | return 0; | |
7922 | } | |
7923 | ||
7924 | static int io_eventfd_unregister(struct io_ring_ctx *ctx) | |
7925 | { | |
7926 | if (ctx->cq_ev_fd) { | |
7927 | eventfd_ctx_put(ctx->cq_ev_fd); | |
7928 | ctx->cq_ev_fd = NULL; | |
7929 | return 0; | |
7930 | } | |
7931 | ||
7932 | return -ENXIO; | |
7933 | } | |
7934 | ||
5a2e745d JA |
7935 | static int __io_destroy_buffers(int id, void *p, void *data) |
7936 | { | |
7937 | struct io_ring_ctx *ctx = data; | |
7938 | struct io_buffer *buf = p; | |
7939 | ||
067524e9 | 7940 | __io_remove_buffers(ctx, buf, id, -1U); |
5a2e745d JA |
7941 | return 0; |
7942 | } | |
7943 | ||
7944 | static void io_destroy_buffers(struct io_ring_ctx *ctx) | |
7945 | { | |
7946 | idr_for_each(&ctx->io_buffer_idr, __io_destroy_buffers, ctx); | |
7947 | idr_destroy(&ctx->io_buffer_idr); | |
7948 | } | |
7949 | ||
2b188cc1 JA |
7950 | static void io_ring_ctx_free(struct io_ring_ctx *ctx) |
7951 | { | |
6b06314c | 7952 | io_finish_async(ctx); |
5dbcad51 | 7953 | io_sqe_buffer_unregister(ctx); |
2aede0e4 JA |
7954 | |
7955 | if (ctx->sqo_task) { | |
7956 | put_task_struct(ctx->sqo_task); | |
7957 | ctx->sqo_task = NULL; | |
7958 | mmdrop(ctx->mm_account); | |
7959 | ctx->mm_account = NULL; | |
30975825 | 7960 | } |
def596e9 | 7961 | |
6b06314c | 7962 | io_sqe_files_unregister(ctx); |
9b402849 | 7963 | io_eventfd_unregister(ctx); |
5a2e745d | 7964 | io_destroy_buffers(ctx); |
41726c9a | 7965 | idr_destroy(&ctx->personality_idr); |
def596e9 | 7966 | |
2b188cc1 | 7967 | #if defined(CONFIG_UNIX) |
355e8d26 EB |
7968 | if (ctx->ring_sock) { |
7969 | ctx->ring_sock->file = NULL; /* so that iput() is called */ | |
2b188cc1 | 7970 | sock_release(ctx->ring_sock); |
355e8d26 | 7971 | } |
2b188cc1 JA |
7972 | #endif |
7973 | ||
75b28aff | 7974 | io_mem_free(ctx->rings); |
2b188cc1 | 7975 | io_mem_free(ctx->sq_sqes); |
2b188cc1 JA |
7976 | |
7977 | percpu_ref_exit(&ctx->refs); | |
2b188cc1 | 7978 | free_uid(ctx->user); |
181e448d | 7979 | put_cred(ctx->creds); |
78076bb6 | 7980 | kfree(ctx->cancel_hash); |
0ddf92e8 | 7981 | kmem_cache_free(req_cachep, ctx->fallback_req); |
2b188cc1 JA |
7982 | kfree(ctx); |
7983 | } | |
7984 | ||
7985 | static __poll_t io_uring_poll(struct file *file, poll_table *wait) | |
7986 | { | |
7987 | struct io_ring_ctx *ctx = file->private_data; | |
7988 | __poll_t mask = 0; | |
7989 | ||
7990 | poll_wait(file, &ctx->cq_wait, wait); | |
4f7067c3 SB |
7991 | /* |
7992 | * synchronizes with barrier from wq_has_sleeper call in | |
7993 | * io_commit_cqring | |
7994 | */ | |
2b188cc1 | 7995 | smp_rmb(); |
75b28aff HV |
7996 | if (READ_ONCE(ctx->rings->sq.tail) - ctx->cached_sq_head != |
7997 | ctx->rings->sq_ring_entries) | |
2b188cc1 | 7998 | mask |= EPOLLOUT | EPOLLWRNORM; |
63e5d81f | 7999 | if (io_cqring_events(ctx, false)) |
2b188cc1 JA |
8000 | mask |= EPOLLIN | EPOLLRDNORM; |
8001 | ||
8002 | return mask; | |
8003 | } | |
8004 | ||
8005 | static int io_uring_fasync(int fd, struct file *file, int on) | |
8006 | { | |
8007 | struct io_ring_ctx *ctx = file->private_data; | |
8008 | ||
8009 | return fasync_helper(fd, file, on, &ctx->cq_fasync); | |
8010 | } | |
8011 | ||
071698e1 JA |
8012 | static int io_remove_personalities(int id, void *p, void *data) |
8013 | { | |
8014 | struct io_ring_ctx *ctx = data; | |
8015 | const struct cred *cred; | |
8016 | ||
8017 | cred = idr_remove(&ctx->personality_idr, id); | |
8018 | if (cred) | |
8019 | put_cred(cred); | |
8020 | return 0; | |
8021 | } | |
8022 | ||
85faa7b8 JA |
8023 | static void io_ring_exit_work(struct work_struct *work) |
8024 | { | |
b2edc0a7 PB |
8025 | struct io_ring_ctx *ctx = container_of(work, struct io_ring_ctx, |
8026 | exit_work); | |
85faa7b8 | 8027 | |
56952e91 JA |
8028 | /* |
8029 | * If we're doing polled IO and end up having requests being | |
8030 | * submitted async (out-of-line), then completions can come in while | |
8031 | * we're waiting for refs to drop. We need to reap these manually, | |
8032 | * as nobody else will be looking for them. | |
8033 | */ | |
b2edc0a7 | 8034 | do { |
56952e91 | 8035 | if (ctx->rings) |
e6c8aa9a | 8036 | io_cqring_overflow_flush(ctx, true, NULL, NULL); |
b2edc0a7 PB |
8037 | io_iopoll_try_reap_events(ctx); |
8038 | } while (!wait_for_completion_timeout(&ctx->ref_comp, HZ/20)); | |
85faa7b8 JA |
8039 | io_ring_ctx_free(ctx); |
8040 | } | |
8041 | ||
2b188cc1 JA |
8042 | static void io_ring_ctx_wait_and_kill(struct io_ring_ctx *ctx) |
8043 | { | |
8044 | mutex_lock(&ctx->uring_lock); | |
8045 | percpu_ref_kill(&ctx->refs); | |
8046 | mutex_unlock(&ctx->uring_lock); | |
8047 | ||
f3606e3a JA |
8048 | io_kill_timeouts(ctx, NULL); |
8049 | io_poll_remove_all(ctx, NULL); | |
561fb04a JA |
8050 | |
8051 | if (ctx->io_wq) | |
8052 | io_wq_cancel_all(ctx->io_wq); | |
8053 | ||
15dff286 JA |
8054 | /* if we failed setting up the ctx, we might not have any rings */ |
8055 | if (ctx->rings) | |
e6c8aa9a | 8056 | io_cqring_overflow_flush(ctx, true, NULL, NULL); |
b2edc0a7 | 8057 | io_iopoll_try_reap_events(ctx); |
071698e1 | 8058 | idr_for_each(&ctx->personality_idr, io_remove_personalities, ctx); |
309fc03a JA |
8059 | |
8060 | /* | |
8061 | * Do this upfront, so we won't have a grace period where the ring | |
8062 | * is closed but resources aren't reaped yet. This can cause | |
8063 | * spurious failure in setting up a new ring. | |
8064 | */ | |
760618f7 JA |
8065 | io_unaccount_mem(ctx, ring_pages(ctx->sq_entries, ctx->cq_entries), |
8066 | ACCT_LOCKED); | |
309fc03a | 8067 | |
85faa7b8 | 8068 | INIT_WORK(&ctx->exit_work, io_ring_exit_work); |
fc666777 JA |
8069 | /* |
8070 | * Use system_unbound_wq to avoid spawning tons of event kworkers | |
8071 | * if we're exiting a ton of rings at the same time. It just adds | |
8072 | * noise and overhead, there's no discernable change in runtime | |
8073 | * over using system_wq. | |
8074 | */ | |
8075 | queue_work(system_unbound_wq, &ctx->exit_work); | |
2b188cc1 JA |
8076 | } |
8077 | ||
8078 | static int io_uring_release(struct inode *inode, struct file *file) | |
8079 | { | |
8080 | struct io_ring_ctx *ctx = file->private_data; | |
8081 | ||
8082 | file->private_data = NULL; | |
8083 | io_ring_ctx_wait_and_kill(ctx); | |
8084 | return 0; | |
8085 | } | |
8086 | ||
67c4d9e6 PB |
8087 | static bool io_wq_files_match(struct io_wq_work *work, void *data) |
8088 | { | |
8089 | struct files_struct *files = data; | |
8090 | ||
0f212204 | 8091 | return !files || work->files == files; |
67c4d9e6 PB |
8092 | } |
8093 | ||
f254ac04 JA |
8094 | /* |
8095 | * Returns true if 'preq' is the link parent of 'req' | |
8096 | */ | |
8097 | static bool io_match_link(struct io_kiocb *preq, struct io_kiocb *req) | |
8098 | { | |
8099 | struct io_kiocb *link; | |
8100 | ||
8101 | if (!(preq->flags & REQ_F_LINK_HEAD)) | |
8102 | return false; | |
8103 | ||
8104 | list_for_each_entry(link, &preq->link_list, link_list) { | |
8105 | if (link == req) | |
8106 | return true; | |
8107 | } | |
8108 | ||
8109 | return false; | |
8110 | } | |
8111 | ||
c127a2a1 PB |
8112 | static bool io_match_link_files(struct io_kiocb *req, |
8113 | struct files_struct *files) | |
8114 | { | |
8115 | struct io_kiocb *link; | |
8116 | ||
8117 | if (io_match_files(req, files)) | |
8118 | return true; | |
8119 | if (req->flags & REQ_F_LINK_HEAD) { | |
8120 | list_for_each_entry(link, &req->link_list, link_list) { | |
8121 | if (io_match_files(link, files)) | |
8122 | return true; | |
8123 | } | |
8124 | } | |
8125 | return false; | |
8126 | } | |
8127 | ||
f254ac04 JA |
8128 | /* |
8129 | * We're looking to cancel 'req' because it's holding on to our files, but | |
8130 | * 'req' could be a link to another request. See if it is, and cancel that | |
8131 | * parent request if so. | |
8132 | */ | |
8133 | static bool io_poll_remove_link(struct io_ring_ctx *ctx, struct io_kiocb *req) | |
8134 | { | |
8135 | struct hlist_node *tmp; | |
8136 | struct io_kiocb *preq; | |
8137 | bool found = false; | |
8138 | int i; | |
8139 | ||
8140 | spin_lock_irq(&ctx->completion_lock); | |
8141 | for (i = 0; i < (1U << ctx->cancel_hash_bits); i++) { | |
8142 | struct hlist_head *list; | |
8143 | ||
8144 | list = &ctx->cancel_hash[i]; | |
8145 | hlist_for_each_entry_safe(preq, tmp, list, hash_node) { | |
8146 | found = io_match_link(preq, req); | |
8147 | if (found) { | |
8148 | io_poll_remove_one(preq); | |
8149 | break; | |
8150 | } | |
8151 | } | |
8152 | } | |
8153 | spin_unlock_irq(&ctx->completion_lock); | |
8154 | return found; | |
8155 | } | |
8156 | ||
8157 | static bool io_timeout_remove_link(struct io_ring_ctx *ctx, | |
8158 | struct io_kiocb *req) | |
8159 | { | |
8160 | struct io_kiocb *preq; | |
8161 | bool found = false; | |
8162 | ||
8163 | spin_lock_irq(&ctx->completion_lock); | |
8164 | list_for_each_entry(preq, &ctx->timeout_list, timeout.list) { | |
8165 | found = io_match_link(preq, req); | |
8166 | if (found) { | |
8167 | __io_timeout_cancel(preq); | |
8168 | break; | |
8169 | } | |
8170 | } | |
8171 | spin_unlock_irq(&ctx->completion_lock); | |
8172 | return found; | |
8173 | } | |
8174 | ||
b711d4ea JA |
8175 | static bool io_cancel_link_cb(struct io_wq_work *work, void *data) |
8176 | { | |
8177 | return io_match_link(container_of(work, struct io_kiocb, work), data); | |
8178 | } | |
8179 | ||
8180 | static void io_attempt_cancel(struct io_ring_ctx *ctx, struct io_kiocb *req) | |
8181 | { | |
8182 | enum io_wq_cancel cret; | |
8183 | ||
8184 | /* cancel this particular work, if it's running */ | |
8185 | cret = io_wq_cancel_work(ctx->io_wq, &req->work); | |
8186 | if (cret != IO_WQ_CANCEL_NOTFOUND) | |
8187 | return; | |
8188 | ||
8189 | /* find links that hold this pending, cancel those */ | |
8190 | cret = io_wq_cancel_cb(ctx->io_wq, io_cancel_link_cb, req, true); | |
8191 | if (cret != IO_WQ_CANCEL_NOTFOUND) | |
8192 | return; | |
8193 | ||
8194 | /* if we have a poll link holding this pending, cancel that */ | |
8195 | if (io_poll_remove_link(ctx, req)) | |
8196 | return; | |
8197 | ||
8198 | /* final option, timeout link is holding this req pending */ | |
8199 | io_timeout_remove_link(ctx, req); | |
8200 | } | |
8201 | ||
b7ddce3c PB |
8202 | static void io_cancel_defer_files(struct io_ring_ctx *ctx, |
8203 | struct files_struct *files) | |
8204 | { | |
8205 | struct io_defer_entry *de = NULL; | |
8206 | LIST_HEAD(list); | |
8207 | ||
8208 | spin_lock_irq(&ctx->completion_lock); | |
8209 | list_for_each_entry_reverse(de, &ctx->defer_list, list) { | |
c127a2a1 | 8210 | if (io_match_link_files(de->req, files)) { |
b7ddce3c PB |
8211 | list_cut_position(&list, &ctx->defer_list, &de->list); |
8212 | break; | |
8213 | } | |
8214 | } | |
8215 | spin_unlock_irq(&ctx->completion_lock); | |
8216 | ||
8217 | while (!list_empty(&list)) { | |
8218 | de = list_first_entry(&list, struct io_defer_entry, list); | |
8219 | list_del_init(&de->list); | |
8220 | req_set_fail_links(de->req); | |
8221 | io_put_req(de->req); | |
8222 | io_req_complete(de->req, -ECANCELED); | |
8223 | kfree(de); | |
8224 | } | |
8225 | } | |
8226 | ||
76e1b642 JA |
8227 | /* |
8228 | * Returns true if we found and killed one or more files pinning requests | |
8229 | */ | |
8230 | static bool io_uring_cancel_files(struct io_ring_ctx *ctx, | |
fcb323cc JA |
8231 | struct files_struct *files) |
8232 | { | |
67c4d9e6 | 8233 | if (list_empty_careful(&ctx->inflight_list)) |
76e1b642 | 8234 | return false; |
67c4d9e6 | 8235 | |
b7ddce3c | 8236 | io_cancel_defer_files(ctx, files); |
67c4d9e6 PB |
8237 | /* cancel all at once, should be faster than doing it one by one*/ |
8238 | io_wq_cancel_cb(ctx->io_wq, io_wq_files_match, files, true); | |
8239 | ||
fcb323cc | 8240 | while (!list_empty_careful(&ctx->inflight_list)) { |
d8f1b971 XW |
8241 | struct io_kiocb *cancel_req = NULL, *req; |
8242 | DEFINE_WAIT(wait); | |
fcb323cc JA |
8243 | |
8244 | spin_lock_irq(&ctx->inflight_lock); | |
8245 | list_for_each_entry(req, &ctx->inflight_list, inflight_entry) { | |
0f212204 | 8246 | if (files && req->work.files != files) |
768134d4 JA |
8247 | continue; |
8248 | /* req is being completed, ignore */ | |
8249 | if (!refcount_inc_not_zero(&req->refs)) | |
8250 | continue; | |
8251 | cancel_req = req; | |
8252 | break; | |
fcb323cc | 8253 | } |
768134d4 | 8254 | if (cancel_req) |
fcb323cc | 8255 | prepare_to_wait(&ctx->inflight_wait, &wait, |
768134d4 | 8256 | TASK_UNINTERRUPTIBLE); |
fcb323cc JA |
8257 | spin_unlock_irq(&ctx->inflight_lock); |
8258 | ||
768134d4 JA |
8259 | /* We need to keep going until we don't find a matching req */ |
8260 | if (!cancel_req) | |
fcb323cc | 8261 | break; |
bb175342 PB |
8262 | /* cancel this request, or head link requests */ |
8263 | io_attempt_cancel(ctx, cancel_req); | |
8264 | io_put_req(cancel_req); | |
6200b0ae JA |
8265 | /* cancellations _may_ trigger task work */ |
8266 | io_run_task_work(); | |
fcb323cc | 8267 | schedule(); |
d8f1b971 | 8268 | finish_wait(&ctx->inflight_wait, &wait); |
fcb323cc | 8269 | } |
76e1b642 JA |
8270 | |
8271 | return true; | |
fcb323cc JA |
8272 | } |
8273 | ||
801dd57b | 8274 | static bool io_cancel_task_cb(struct io_wq_work *work, void *data) |
44e728b8 | 8275 | { |
801dd57b PB |
8276 | struct io_kiocb *req = container_of(work, struct io_kiocb, work); |
8277 | struct task_struct *task = data; | |
44e728b8 | 8278 | |
f3606e3a | 8279 | return io_task_match(req, task); |
44e728b8 PB |
8280 | } |
8281 | ||
0f212204 JA |
8282 | static bool __io_uring_cancel_task_requests(struct io_ring_ctx *ctx, |
8283 | struct task_struct *task, | |
8284 | struct files_struct *files) | |
8285 | { | |
8286 | bool ret; | |
8287 | ||
8288 | ret = io_uring_cancel_files(ctx, files); | |
8289 | if (!files) { | |
8290 | enum io_wq_cancel cret; | |
8291 | ||
8292 | cret = io_wq_cancel_cb(ctx->io_wq, io_cancel_task_cb, task, true); | |
8293 | if (cret != IO_WQ_CANCEL_NOTFOUND) | |
8294 | ret = true; | |
8295 | ||
8296 | /* SQPOLL thread does its own polling */ | |
8297 | if (!(ctx->flags & IORING_SETUP_SQPOLL)) { | |
8298 | while (!list_empty_careful(&ctx->iopoll_list)) { | |
8299 | io_iopoll_try_reap_events(ctx); | |
8300 | ret = true; | |
8301 | } | |
8302 | } | |
8303 | ||
8304 | ret |= io_poll_remove_all(ctx, task); | |
8305 | ret |= io_kill_timeouts(ctx, task); | |
8306 | } | |
8307 | ||
8308 | return ret; | |
8309 | } | |
8310 | ||
8311 | /* | |
8312 | * We need to iteratively cancel requests, in case a request has dependent | |
8313 | * hard links. These persist even for failure of cancelations, hence keep | |
8314 | * looping until none are found. | |
8315 | */ | |
8316 | static void io_uring_cancel_task_requests(struct io_ring_ctx *ctx, | |
8317 | struct files_struct *files) | |
8318 | { | |
8319 | struct task_struct *task = current; | |
8320 | ||
8321 | if (ctx->flags & IORING_SETUP_SQPOLL) | |
8322 | task = ctx->sqo_thread; | |
8323 | ||
8324 | io_cqring_overflow_flush(ctx, true, task, files); | |
8325 | ||
8326 | while (__io_uring_cancel_task_requests(ctx, task, files)) { | |
8327 | io_run_task_work(); | |
8328 | cond_resched(); | |
8329 | } | |
8330 | } | |
8331 | ||
8332 | /* | |
8333 | * Note that this task has used io_uring. We use it for cancelation purposes. | |
8334 | */ | |
8335 | static int io_uring_add_task_file(struct file *file) | |
8336 | { | |
8337 | if (unlikely(!current->io_uring)) { | |
8338 | int ret; | |
8339 | ||
8340 | ret = io_uring_alloc_task_context(current); | |
8341 | if (unlikely(ret)) | |
8342 | return ret; | |
8343 | } | |
8344 | if (current->io_uring->last != file) { | |
8345 | XA_STATE(xas, ¤t->io_uring->xa, (unsigned long) file); | |
8346 | void *old; | |
8347 | ||
8348 | rcu_read_lock(); | |
8349 | old = xas_load(&xas); | |
8350 | if (old != file) { | |
8351 | get_file(file); | |
8352 | xas_lock(&xas); | |
8353 | xas_store(&xas, file); | |
8354 | xas_unlock(&xas); | |
8355 | } | |
8356 | rcu_read_unlock(); | |
8357 | current->io_uring->last = file; | |
8358 | } | |
8359 | ||
8360 | return 0; | |
8361 | } | |
8362 | ||
8363 | /* | |
8364 | * Remove this io_uring_file -> task mapping. | |
8365 | */ | |
8366 | static void io_uring_del_task_file(struct file *file) | |
8367 | { | |
8368 | struct io_uring_task *tctx = current->io_uring; | |
8369 | XA_STATE(xas, &tctx->xa, (unsigned long) file); | |
8370 | ||
8371 | if (tctx->last == file) | |
8372 | tctx->last = NULL; | |
8373 | ||
8374 | xas_lock(&xas); | |
8375 | file = xas_store(&xas, NULL); | |
8376 | xas_unlock(&xas); | |
8377 | ||
8378 | if (file) | |
8379 | fput(file); | |
8380 | } | |
8381 | ||
8382 | static void __io_uring_attempt_task_drop(struct file *file) | |
8383 | { | |
8384 | XA_STATE(xas, ¤t->io_uring->xa, (unsigned long) file); | |
8385 | struct file *old; | |
8386 | ||
8387 | rcu_read_lock(); | |
8388 | old = xas_load(&xas); | |
8389 | rcu_read_unlock(); | |
8390 | ||
8391 | if (old == file) | |
8392 | io_uring_del_task_file(file); | |
8393 | } | |
8394 | ||
8395 | /* | |
8396 | * Drop task note for this file if we're the only ones that hold it after | |
8397 | * pending fput() | |
8398 | */ | |
8399 | static void io_uring_attempt_task_drop(struct file *file, bool exiting) | |
8400 | { | |
8401 | if (!current->io_uring) | |
8402 | return; | |
8403 | /* | |
8404 | * fput() is pending, will be 2 if the only other ref is our potential | |
8405 | * task file note. If the task is exiting, drop regardless of count. | |
8406 | */ | |
8407 | if (!exiting && atomic_long_read(&file->f_count) != 2) | |
8408 | return; | |
8409 | ||
8410 | __io_uring_attempt_task_drop(file); | |
8411 | } | |
8412 | ||
8413 | void __io_uring_files_cancel(struct files_struct *files) | |
8414 | { | |
8415 | struct io_uring_task *tctx = current->io_uring; | |
8416 | XA_STATE(xas, &tctx->xa, 0); | |
8417 | ||
8418 | /* make sure overflow events are dropped */ | |
8419 | tctx->in_idle = true; | |
8420 | ||
8421 | do { | |
8422 | struct io_ring_ctx *ctx; | |
8423 | struct file *file; | |
8424 | ||
8425 | xas_lock(&xas); | |
8426 | file = xas_next_entry(&xas, ULONG_MAX); | |
8427 | xas_unlock(&xas); | |
8428 | ||
8429 | if (!file) | |
8430 | break; | |
8431 | ||
8432 | ctx = file->private_data; | |
8433 | ||
8434 | io_uring_cancel_task_requests(ctx, files); | |
8435 | if (files) | |
8436 | io_uring_del_task_file(file); | |
8437 | } while (1); | |
8438 | } | |
8439 | ||
8440 | static inline bool io_uring_task_idle(struct io_uring_task *tctx) | |
8441 | { | |
8442 | return atomic_long_read(&tctx->req_issue) == | |
8443 | atomic_long_read(&tctx->req_complete); | |
8444 | } | |
8445 | ||
8446 | /* | |
8447 | * Find any io_uring fd that this task has registered or done IO on, and cancel | |
8448 | * requests. | |
8449 | */ | |
8450 | void __io_uring_task_cancel(void) | |
8451 | { | |
8452 | struct io_uring_task *tctx = current->io_uring; | |
8453 | DEFINE_WAIT(wait); | |
8454 | long completions; | |
8455 | ||
8456 | /* make sure overflow events are dropped */ | |
8457 | tctx->in_idle = true; | |
8458 | ||
8459 | while (!io_uring_task_idle(tctx)) { | |
8460 | /* read completions before cancelations */ | |
8461 | completions = atomic_long_read(&tctx->req_complete); | |
8462 | __io_uring_files_cancel(NULL); | |
8463 | ||
8464 | prepare_to_wait(&tctx->wait, &wait, TASK_UNINTERRUPTIBLE); | |
8465 | ||
8466 | /* | |
8467 | * If we've seen completions, retry. This avoids a race where | |
8468 | * a completion comes in before we did prepare_to_wait(). | |
8469 | */ | |
8470 | if (completions != atomic_long_read(&tctx->req_complete)) | |
8471 | continue; | |
8472 | if (io_uring_task_idle(tctx)) | |
8473 | break; | |
8474 | schedule(); | |
8475 | } | |
8476 | ||
8477 | finish_wait(&tctx->wait, &wait); | |
8478 | tctx->in_idle = false; | |
8479 | } | |
8480 | ||
fcb323cc JA |
8481 | static int io_uring_flush(struct file *file, void *data) |
8482 | { | |
8483 | struct io_ring_ctx *ctx = file->private_data; | |
8484 | ||
6ab23144 JA |
8485 | /* |
8486 | * If the task is going away, cancel work it may have pending | |
8487 | */ | |
801dd57b | 8488 | if (fatal_signal_pending(current) || (current->flags & PF_EXITING)) |
0f212204 | 8489 | data = NULL; |
6ab23144 | 8490 | |
0f212204 JA |
8491 | io_uring_cancel_task_requests(ctx, data); |
8492 | io_uring_attempt_task_drop(file, !data); | |
fcb323cc JA |
8493 | return 0; |
8494 | } | |
8495 | ||
6c5c240e RP |
8496 | static void *io_uring_validate_mmap_request(struct file *file, |
8497 | loff_t pgoff, size_t sz) | |
2b188cc1 | 8498 | { |
2b188cc1 | 8499 | struct io_ring_ctx *ctx = file->private_data; |
6c5c240e | 8500 | loff_t offset = pgoff << PAGE_SHIFT; |
2b188cc1 JA |
8501 | struct page *page; |
8502 | void *ptr; | |
8503 | ||
8504 | switch (offset) { | |
8505 | case IORING_OFF_SQ_RING: | |
75b28aff HV |
8506 | case IORING_OFF_CQ_RING: |
8507 | ptr = ctx->rings; | |
2b188cc1 JA |
8508 | break; |
8509 | case IORING_OFF_SQES: | |
8510 | ptr = ctx->sq_sqes; | |
8511 | break; | |
2b188cc1 | 8512 | default: |
6c5c240e | 8513 | return ERR_PTR(-EINVAL); |
2b188cc1 JA |
8514 | } |
8515 | ||
8516 | page = virt_to_head_page(ptr); | |
a50b854e | 8517 | if (sz > page_size(page)) |
6c5c240e RP |
8518 | return ERR_PTR(-EINVAL); |
8519 | ||
8520 | return ptr; | |
8521 | } | |
8522 | ||
8523 | #ifdef CONFIG_MMU | |
8524 | ||
8525 | static int io_uring_mmap(struct file *file, struct vm_area_struct *vma) | |
8526 | { | |
8527 | size_t sz = vma->vm_end - vma->vm_start; | |
8528 | unsigned long pfn; | |
8529 | void *ptr; | |
8530 | ||
8531 | ptr = io_uring_validate_mmap_request(file, vma->vm_pgoff, sz); | |
8532 | if (IS_ERR(ptr)) | |
8533 | return PTR_ERR(ptr); | |
2b188cc1 JA |
8534 | |
8535 | pfn = virt_to_phys(ptr) >> PAGE_SHIFT; | |
8536 | return remap_pfn_range(vma, vma->vm_start, pfn, sz, vma->vm_page_prot); | |
8537 | } | |
8538 | ||
6c5c240e RP |
8539 | #else /* !CONFIG_MMU */ |
8540 | ||
8541 | static int io_uring_mmap(struct file *file, struct vm_area_struct *vma) | |
8542 | { | |
8543 | return vma->vm_flags & (VM_SHARED | VM_MAYSHARE) ? 0 : -EINVAL; | |
8544 | } | |
8545 | ||
8546 | static unsigned int io_uring_nommu_mmap_capabilities(struct file *file) | |
8547 | { | |
8548 | return NOMMU_MAP_DIRECT | NOMMU_MAP_READ | NOMMU_MAP_WRITE; | |
8549 | } | |
8550 | ||
8551 | static unsigned long io_uring_nommu_get_unmapped_area(struct file *file, | |
8552 | unsigned long addr, unsigned long len, | |
8553 | unsigned long pgoff, unsigned long flags) | |
8554 | { | |
8555 | void *ptr; | |
8556 | ||
8557 | ptr = io_uring_validate_mmap_request(file, pgoff, len); | |
8558 | if (IS_ERR(ptr)) | |
8559 | return PTR_ERR(ptr); | |
8560 | ||
8561 | return (unsigned long) ptr; | |
8562 | } | |
8563 | ||
8564 | #endif /* !CONFIG_MMU */ | |
8565 | ||
2b188cc1 JA |
8566 | SYSCALL_DEFINE6(io_uring_enter, unsigned int, fd, u32, to_submit, |
8567 | u32, min_complete, u32, flags, const sigset_t __user *, sig, | |
8568 | size_t, sigsz) | |
8569 | { | |
8570 | struct io_ring_ctx *ctx; | |
8571 | long ret = -EBADF; | |
8572 | int submitted = 0; | |
8573 | struct fd f; | |
8574 | ||
4c6e277c | 8575 | io_run_task_work(); |
b41e9852 | 8576 | |
6c271ce2 | 8577 | if (flags & ~(IORING_ENTER_GETEVENTS | IORING_ENTER_SQ_WAKEUP)) |
2b188cc1 JA |
8578 | return -EINVAL; |
8579 | ||
8580 | f = fdget(fd); | |
8581 | if (!f.file) | |
8582 | return -EBADF; | |
8583 | ||
8584 | ret = -EOPNOTSUPP; | |
8585 | if (f.file->f_op != &io_uring_fops) | |
8586 | goto out_fput; | |
8587 | ||
8588 | ret = -ENXIO; | |
8589 | ctx = f.file->private_data; | |
8590 | if (!percpu_ref_tryget(&ctx->refs)) | |
8591 | goto out_fput; | |
8592 | ||
6c271ce2 JA |
8593 | /* |
8594 | * For SQ polling, the thread will do all submissions and completions. | |
8595 | * Just return the requested submit count, and wake the thread if | |
8596 | * we were asked to. | |
8597 | */ | |
b2a9eada | 8598 | ret = 0; |
6c271ce2 | 8599 | if (ctx->flags & IORING_SETUP_SQPOLL) { |
c1edbf5f | 8600 | if (!list_empty_careful(&ctx->cq_overflow_list)) |
e6c8aa9a | 8601 | io_cqring_overflow_flush(ctx, false, NULL, NULL); |
6c271ce2 JA |
8602 | if (flags & IORING_ENTER_SQ_WAKEUP) |
8603 | wake_up(&ctx->sqo_wait); | |
8604 | submitted = to_submit; | |
b2a9eada | 8605 | } else if (to_submit) { |
0f212204 JA |
8606 | ret = io_uring_add_task_file(f.file); |
8607 | if (unlikely(ret)) | |
8608 | goto out; | |
2b188cc1 | 8609 | mutex_lock(&ctx->uring_lock); |
0f212204 | 8610 | submitted = io_submit_sqes(ctx, to_submit); |
2b188cc1 | 8611 | mutex_unlock(&ctx->uring_lock); |
7c504e65 PB |
8612 | |
8613 | if (submitted != to_submit) | |
8614 | goto out; | |
2b188cc1 JA |
8615 | } |
8616 | if (flags & IORING_ENTER_GETEVENTS) { | |
8617 | min_complete = min(min_complete, ctx->cq_entries); | |
8618 | ||
32b2244a XW |
8619 | /* |
8620 | * When SETUP_IOPOLL and SETUP_SQPOLL are both enabled, user | |
8621 | * space applications don't need to do io completion events | |
8622 | * polling again, they can rely on io_sq_thread to do polling | |
8623 | * work, which can reduce cpu usage and uring_lock contention. | |
8624 | */ | |
8625 | if (ctx->flags & IORING_SETUP_IOPOLL && | |
8626 | !(ctx->flags & IORING_SETUP_SQPOLL)) { | |
7668b92a | 8627 | ret = io_iopoll_check(ctx, min_complete); |
def596e9 JA |
8628 | } else { |
8629 | ret = io_cqring_wait(ctx, min_complete, sig, sigsz); | |
8630 | } | |
2b188cc1 JA |
8631 | } |
8632 | ||
7c504e65 | 8633 | out: |
6805b32e | 8634 | percpu_ref_put(&ctx->refs); |
2b188cc1 JA |
8635 | out_fput: |
8636 | fdput(f); | |
8637 | return submitted ? submitted : ret; | |
8638 | } | |
8639 | ||
bebdb65e | 8640 | #ifdef CONFIG_PROC_FS |
87ce955b JA |
8641 | static int io_uring_show_cred(int id, void *p, void *data) |
8642 | { | |
8643 | const struct cred *cred = p; | |
8644 | struct seq_file *m = data; | |
8645 | struct user_namespace *uns = seq_user_ns(m); | |
8646 | struct group_info *gi; | |
8647 | kernel_cap_t cap; | |
8648 | unsigned __capi; | |
8649 | int g; | |
8650 | ||
8651 | seq_printf(m, "%5d\n", id); | |
8652 | seq_put_decimal_ull(m, "\tUid:\t", from_kuid_munged(uns, cred->uid)); | |
8653 | seq_put_decimal_ull(m, "\t\t", from_kuid_munged(uns, cred->euid)); | |
8654 | seq_put_decimal_ull(m, "\t\t", from_kuid_munged(uns, cred->suid)); | |
8655 | seq_put_decimal_ull(m, "\t\t", from_kuid_munged(uns, cred->fsuid)); | |
8656 | seq_put_decimal_ull(m, "\n\tGid:\t", from_kgid_munged(uns, cred->gid)); | |
8657 | seq_put_decimal_ull(m, "\t\t", from_kgid_munged(uns, cred->egid)); | |
8658 | seq_put_decimal_ull(m, "\t\t", from_kgid_munged(uns, cred->sgid)); | |
8659 | seq_put_decimal_ull(m, "\t\t", from_kgid_munged(uns, cred->fsgid)); | |
8660 | seq_puts(m, "\n\tGroups:\t"); | |
8661 | gi = cred->group_info; | |
8662 | for (g = 0; g < gi->ngroups; g++) { | |
8663 | seq_put_decimal_ull(m, g ? " " : "", | |
8664 | from_kgid_munged(uns, gi->gid[g])); | |
8665 | } | |
8666 | seq_puts(m, "\n\tCapEff:\t"); | |
8667 | cap = cred->cap_effective; | |
8668 | CAP_FOR_EACH_U32(__capi) | |
8669 | seq_put_hex_ll(m, NULL, cap.cap[CAP_LAST_U32 - __capi], 8); | |
8670 | seq_putc(m, '\n'); | |
8671 | return 0; | |
8672 | } | |
8673 | ||
8674 | static void __io_uring_show_fdinfo(struct io_ring_ctx *ctx, struct seq_file *m) | |
8675 | { | |
fad8e0de | 8676 | bool has_lock; |
87ce955b JA |
8677 | int i; |
8678 | ||
fad8e0de JA |
8679 | /* |
8680 | * Avoid ABBA deadlock between the seq lock and the io_uring mutex, | |
8681 | * since fdinfo case grabs it in the opposite direction of normal use | |
8682 | * cases. If we fail to get the lock, we just don't iterate any | |
8683 | * structures that could be going away outside the io_uring mutex. | |
8684 | */ | |
8685 | has_lock = mutex_trylock(&ctx->uring_lock); | |
8686 | ||
87ce955b | 8687 | seq_printf(m, "UserFiles:\t%u\n", ctx->nr_user_files); |
fad8e0de | 8688 | for (i = 0; has_lock && i < ctx->nr_user_files; i++) { |
87ce955b JA |
8689 | struct fixed_file_table *table; |
8690 | struct file *f; | |
8691 | ||
8692 | table = &ctx->file_data->table[i >> IORING_FILE_TABLE_SHIFT]; | |
8693 | f = table->files[i & IORING_FILE_TABLE_MASK]; | |
8694 | if (f) | |
8695 | seq_printf(m, "%5u: %s\n", i, file_dentry(f)->d_iname); | |
8696 | else | |
8697 | seq_printf(m, "%5u: <none>\n", i); | |
8698 | } | |
8699 | seq_printf(m, "UserBufs:\t%u\n", ctx->nr_user_bufs); | |
fad8e0de | 8700 | for (i = 0; has_lock && i < ctx->nr_user_bufs; i++) { |
87ce955b JA |
8701 | struct io_mapped_ubuf *buf = &ctx->user_bufs[i]; |
8702 | ||
8703 | seq_printf(m, "%5u: 0x%llx/%u\n", i, buf->ubuf, | |
8704 | (unsigned int) buf->len); | |
8705 | } | |
fad8e0de | 8706 | if (has_lock && !idr_is_empty(&ctx->personality_idr)) { |
87ce955b JA |
8707 | seq_printf(m, "Personalities:\n"); |
8708 | idr_for_each(&ctx->personality_idr, io_uring_show_cred, m); | |
8709 | } | |
d7718a9d JA |
8710 | seq_printf(m, "PollList:\n"); |
8711 | spin_lock_irq(&ctx->completion_lock); | |
8712 | for (i = 0; i < (1U << ctx->cancel_hash_bits); i++) { | |
8713 | struct hlist_head *list = &ctx->cancel_hash[i]; | |
8714 | struct io_kiocb *req; | |
8715 | ||
8716 | hlist_for_each_entry(req, list, hash_node) | |
8717 | seq_printf(m, " op=%d, task_works=%d\n", req->opcode, | |
8718 | req->task->task_works != NULL); | |
8719 | } | |
8720 | spin_unlock_irq(&ctx->completion_lock); | |
fad8e0de JA |
8721 | if (has_lock) |
8722 | mutex_unlock(&ctx->uring_lock); | |
87ce955b JA |
8723 | } |
8724 | ||
8725 | static void io_uring_show_fdinfo(struct seq_file *m, struct file *f) | |
8726 | { | |
8727 | struct io_ring_ctx *ctx = f->private_data; | |
8728 | ||
8729 | if (percpu_ref_tryget(&ctx->refs)) { | |
8730 | __io_uring_show_fdinfo(ctx, m); | |
8731 | percpu_ref_put(&ctx->refs); | |
8732 | } | |
8733 | } | |
bebdb65e | 8734 | #endif |
87ce955b | 8735 | |
2b188cc1 JA |
8736 | static const struct file_operations io_uring_fops = { |
8737 | .release = io_uring_release, | |
fcb323cc | 8738 | .flush = io_uring_flush, |
2b188cc1 | 8739 | .mmap = io_uring_mmap, |
6c5c240e RP |
8740 | #ifndef CONFIG_MMU |
8741 | .get_unmapped_area = io_uring_nommu_get_unmapped_area, | |
8742 | .mmap_capabilities = io_uring_nommu_mmap_capabilities, | |
8743 | #endif | |
2b188cc1 JA |
8744 | .poll = io_uring_poll, |
8745 | .fasync = io_uring_fasync, | |
bebdb65e | 8746 | #ifdef CONFIG_PROC_FS |
87ce955b | 8747 | .show_fdinfo = io_uring_show_fdinfo, |
bebdb65e | 8748 | #endif |
2b188cc1 JA |
8749 | }; |
8750 | ||
8751 | static int io_allocate_scq_urings(struct io_ring_ctx *ctx, | |
8752 | struct io_uring_params *p) | |
8753 | { | |
75b28aff HV |
8754 | struct io_rings *rings; |
8755 | size_t size, sq_array_offset; | |
2b188cc1 | 8756 | |
bd740481 JA |
8757 | /* make sure these are sane, as we already accounted them */ |
8758 | ctx->sq_entries = p->sq_entries; | |
8759 | ctx->cq_entries = p->cq_entries; | |
8760 | ||
75b28aff HV |
8761 | size = rings_size(p->sq_entries, p->cq_entries, &sq_array_offset); |
8762 | if (size == SIZE_MAX) | |
8763 | return -EOVERFLOW; | |
8764 | ||
8765 | rings = io_mem_alloc(size); | |
8766 | if (!rings) | |
2b188cc1 JA |
8767 | return -ENOMEM; |
8768 | ||
75b28aff HV |
8769 | ctx->rings = rings; |
8770 | ctx->sq_array = (u32 *)((char *)rings + sq_array_offset); | |
8771 | rings->sq_ring_mask = p->sq_entries - 1; | |
8772 | rings->cq_ring_mask = p->cq_entries - 1; | |
8773 | rings->sq_ring_entries = p->sq_entries; | |
8774 | rings->cq_ring_entries = p->cq_entries; | |
8775 | ctx->sq_mask = rings->sq_ring_mask; | |
8776 | ctx->cq_mask = rings->cq_ring_mask; | |
2b188cc1 JA |
8777 | |
8778 | size = array_size(sizeof(struct io_uring_sqe), p->sq_entries); | |
eb065d30 JA |
8779 | if (size == SIZE_MAX) { |
8780 | io_mem_free(ctx->rings); | |
8781 | ctx->rings = NULL; | |
2b188cc1 | 8782 | return -EOVERFLOW; |
eb065d30 | 8783 | } |
2b188cc1 JA |
8784 | |
8785 | ctx->sq_sqes = io_mem_alloc(size); | |
eb065d30 JA |
8786 | if (!ctx->sq_sqes) { |
8787 | io_mem_free(ctx->rings); | |
8788 | ctx->rings = NULL; | |
2b188cc1 | 8789 | return -ENOMEM; |
eb065d30 | 8790 | } |
2b188cc1 | 8791 | |
2b188cc1 JA |
8792 | return 0; |
8793 | } | |
8794 | ||
8795 | /* | |
8796 | * Allocate an anonymous fd, this is what constitutes the application | |
8797 | * visible backing of an io_uring instance. The application mmaps this | |
8798 | * fd to gain access to the SQ/CQ ring details. If UNIX sockets are enabled, | |
8799 | * we have to tie this fd to a socket for file garbage collection purposes. | |
8800 | */ | |
8801 | static int io_uring_get_fd(struct io_ring_ctx *ctx) | |
8802 | { | |
8803 | struct file *file; | |
8804 | int ret; | |
8805 | ||
8806 | #if defined(CONFIG_UNIX) | |
8807 | ret = sock_create_kern(&init_net, PF_UNIX, SOCK_RAW, IPPROTO_IP, | |
8808 | &ctx->ring_sock); | |
8809 | if (ret) | |
8810 | return ret; | |
8811 | #endif | |
8812 | ||
8813 | ret = get_unused_fd_flags(O_RDWR | O_CLOEXEC); | |
8814 | if (ret < 0) | |
8815 | goto err; | |
8816 | ||
8817 | file = anon_inode_getfile("[io_uring]", &io_uring_fops, ctx, | |
8818 | O_RDWR | O_CLOEXEC); | |
8819 | if (IS_ERR(file)) { | |
0f212204 | 8820 | err_fd: |
2b188cc1 JA |
8821 | put_unused_fd(ret); |
8822 | ret = PTR_ERR(file); | |
8823 | goto err; | |
8824 | } | |
8825 | ||
8826 | #if defined(CONFIG_UNIX) | |
8827 | ctx->ring_sock->file = file; | |
8828 | #endif | |
0f212204 JA |
8829 | if (unlikely(io_uring_add_task_file(file))) { |
8830 | file = ERR_PTR(-ENOMEM); | |
8831 | goto err_fd; | |
8832 | } | |
2b188cc1 JA |
8833 | fd_install(ret, file); |
8834 | return ret; | |
8835 | err: | |
8836 | #if defined(CONFIG_UNIX) | |
8837 | sock_release(ctx->ring_sock); | |
8838 | ctx->ring_sock = NULL; | |
8839 | #endif | |
8840 | return ret; | |
8841 | } | |
8842 | ||
7f13657d XW |
8843 | static int io_uring_create(unsigned entries, struct io_uring_params *p, |
8844 | struct io_uring_params __user *params) | |
2b188cc1 JA |
8845 | { |
8846 | struct user_struct *user = NULL; | |
8847 | struct io_ring_ctx *ctx; | |
aad5d8da | 8848 | bool limit_mem; |
2b188cc1 JA |
8849 | int ret; |
8850 | ||
8110c1a6 | 8851 | if (!entries) |
2b188cc1 | 8852 | return -EINVAL; |
8110c1a6 JA |
8853 | if (entries > IORING_MAX_ENTRIES) { |
8854 | if (!(p->flags & IORING_SETUP_CLAMP)) | |
8855 | return -EINVAL; | |
8856 | entries = IORING_MAX_ENTRIES; | |
8857 | } | |
2b188cc1 JA |
8858 | |
8859 | /* | |
8860 | * Use twice as many entries for the CQ ring. It's possible for the | |
8861 | * application to drive a higher depth than the size of the SQ ring, | |
8862 | * since the sqes are only used at submission time. This allows for | |
33a107f0 JA |
8863 | * some flexibility in overcommitting a bit. If the application has |
8864 | * set IORING_SETUP_CQSIZE, it will have passed in the desired number | |
8865 | * of CQ ring entries manually. | |
2b188cc1 JA |
8866 | */ |
8867 | p->sq_entries = roundup_pow_of_two(entries); | |
33a107f0 JA |
8868 | if (p->flags & IORING_SETUP_CQSIZE) { |
8869 | /* | |
8870 | * If IORING_SETUP_CQSIZE is set, we do the same roundup | |
8871 | * to a power-of-two, if it isn't already. We do NOT impose | |
8872 | * any cq vs sq ring sizing. | |
8873 | */ | |
8110c1a6 | 8874 | if (p->cq_entries < p->sq_entries) |
33a107f0 | 8875 | return -EINVAL; |
8110c1a6 JA |
8876 | if (p->cq_entries > IORING_MAX_CQ_ENTRIES) { |
8877 | if (!(p->flags & IORING_SETUP_CLAMP)) | |
8878 | return -EINVAL; | |
8879 | p->cq_entries = IORING_MAX_CQ_ENTRIES; | |
8880 | } | |
33a107f0 JA |
8881 | p->cq_entries = roundup_pow_of_two(p->cq_entries); |
8882 | } else { | |
8883 | p->cq_entries = 2 * p->sq_entries; | |
8884 | } | |
2b188cc1 JA |
8885 | |
8886 | user = get_uid(current_user()); | |
aad5d8da | 8887 | limit_mem = !capable(CAP_IPC_LOCK); |
2b188cc1 | 8888 | |
aad5d8da | 8889 | if (limit_mem) { |
a087e2b5 | 8890 | ret = __io_account_mem(user, |
2b188cc1 JA |
8891 | ring_pages(p->sq_entries, p->cq_entries)); |
8892 | if (ret) { | |
8893 | free_uid(user); | |
8894 | return ret; | |
8895 | } | |
8896 | } | |
8897 | ||
8898 | ctx = io_ring_ctx_alloc(p); | |
8899 | if (!ctx) { | |
aad5d8da | 8900 | if (limit_mem) |
a087e2b5 | 8901 | __io_unaccount_mem(user, ring_pages(p->sq_entries, |
2b188cc1 JA |
8902 | p->cq_entries)); |
8903 | free_uid(user); | |
8904 | return -ENOMEM; | |
8905 | } | |
8906 | ctx->compat = in_compat_syscall(); | |
2b188cc1 | 8907 | ctx->user = user; |
0b8c0ec7 | 8908 | ctx->creds = get_current_cred(); |
2b188cc1 | 8909 | |
2aede0e4 JA |
8910 | ctx->sqo_task = get_task_struct(current); |
8911 | ||
8912 | /* | |
8913 | * This is just grabbed for accounting purposes. When a process exits, | |
8914 | * the mm is exited and dropped before the files, hence we need to hang | |
8915 | * on to this mm purely for the purposes of being able to unaccount | |
8916 | * memory (locked/pinned vm). It's not used for anything else. | |
8917 | */ | |
6b7898eb | 8918 | mmgrab(current->mm); |
2aede0e4 | 8919 | ctx->mm_account = current->mm; |
6b7898eb | 8920 | |
f74441e6 JA |
8921 | /* |
8922 | * Account memory _before_ installing the file descriptor. Once | |
8923 | * the descriptor is installed, it can get closed at any time. Also | |
8924 | * do this before hitting the general error path, as ring freeing | |
8925 | * will un-account as well. | |
8926 | */ | |
8927 | io_account_mem(ctx, ring_pages(p->sq_entries, p->cq_entries), | |
8928 | ACCT_LOCKED); | |
8929 | ctx->limit_mem = limit_mem; | |
8930 | ||
2b188cc1 JA |
8931 | ret = io_allocate_scq_urings(ctx, p); |
8932 | if (ret) | |
8933 | goto err; | |
8934 | ||
6c271ce2 | 8935 | ret = io_sq_offload_start(ctx, p); |
2b188cc1 JA |
8936 | if (ret) |
8937 | goto err; | |
8938 | ||
2b188cc1 | 8939 | memset(&p->sq_off, 0, sizeof(p->sq_off)); |
75b28aff HV |
8940 | p->sq_off.head = offsetof(struct io_rings, sq.head); |
8941 | p->sq_off.tail = offsetof(struct io_rings, sq.tail); | |
8942 | p->sq_off.ring_mask = offsetof(struct io_rings, sq_ring_mask); | |
8943 | p->sq_off.ring_entries = offsetof(struct io_rings, sq_ring_entries); | |
8944 | p->sq_off.flags = offsetof(struct io_rings, sq_flags); | |
8945 | p->sq_off.dropped = offsetof(struct io_rings, sq_dropped); | |
8946 | p->sq_off.array = (char *)ctx->sq_array - (char *)ctx->rings; | |
2b188cc1 JA |
8947 | |
8948 | memset(&p->cq_off, 0, sizeof(p->cq_off)); | |
75b28aff HV |
8949 | p->cq_off.head = offsetof(struct io_rings, cq.head); |
8950 | p->cq_off.tail = offsetof(struct io_rings, cq.tail); | |
8951 | p->cq_off.ring_mask = offsetof(struct io_rings, cq_ring_mask); | |
8952 | p->cq_off.ring_entries = offsetof(struct io_rings, cq_ring_entries); | |
8953 | p->cq_off.overflow = offsetof(struct io_rings, cq_overflow); | |
8954 | p->cq_off.cqes = offsetof(struct io_rings, cqes); | |
0d9b5b3a | 8955 | p->cq_off.flags = offsetof(struct io_rings, cq_flags); |
ac90f249 | 8956 | |
7f13657d XW |
8957 | p->features = IORING_FEAT_SINGLE_MMAP | IORING_FEAT_NODROP | |
8958 | IORING_FEAT_SUBMIT_STABLE | IORING_FEAT_RW_CUR_POS | | |
5769a351 JX |
8959 | IORING_FEAT_CUR_PERSONALITY | IORING_FEAT_FAST_POLL | |
8960 | IORING_FEAT_POLL_32BITS; | |
7f13657d XW |
8961 | |
8962 | if (copy_to_user(params, p, sizeof(*p))) { | |
8963 | ret = -EFAULT; | |
8964 | goto err; | |
8965 | } | |
d1719f70 | 8966 | |
044c1ab3 JA |
8967 | /* |
8968 | * Install ring fd as the very last thing, so we don't risk someone | |
8969 | * having closed it before we finish setup | |
8970 | */ | |
8971 | ret = io_uring_get_fd(ctx); | |
8972 | if (ret < 0) | |
8973 | goto err; | |
8974 | ||
c826bd7a | 8975 | trace_io_uring_create(ret, ctx, p->sq_entries, p->cq_entries, p->flags); |
2b188cc1 JA |
8976 | return ret; |
8977 | err: | |
8978 | io_ring_ctx_wait_and_kill(ctx); | |
8979 | return ret; | |
8980 | } | |
8981 | ||
8982 | /* | |
8983 | * Sets up an aio uring context, and returns the fd. Applications asks for a | |
8984 | * ring size, we return the actual sq/cq ring sizes (among other things) in the | |
8985 | * params structure passed in. | |
8986 | */ | |
8987 | static long io_uring_setup(u32 entries, struct io_uring_params __user *params) | |
8988 | { | |
8989 | struct io_uring_params p; | |
2b188cc1 JA |
8990 | int i; |
8991 | ||
8992 | if (copy_from_user(&p, params, sizeof(p))) | |
8993 | return -EFAULT; | |
8994 | for (i = 0; i < ARRAY_SIZE(p.resv); i++) { | |
8995 | if (p.resv[i]) | |
8996 | return -EINVAL; | |
8997 | } | |
8998 | ||
6c271ce2 | 8999 | if (p.flags & ~(IORING_SETUP_IOPOLL | IORING_SETUP_SQPOLL | |
8110c1a6 | 9000 | IORING_SETUP_SQ_AFF | IORING_SETUP_CQSIZE | |
24369c2e | 9001 | IORING_SETUP_CLAMP | IORING_SETUP_ATTACH_WQ)) |
2b188cc1 JA |
9002 | return -EINVAL; |
9003 | ||
7f13657d | 9004 | return io_uring_create(entries, &p, params); |
2b188cc1 JA |
9005 | } |
9006 | ||
9007 | SYSCALL_DEFINE2(io_uring_setup, u32, entries, | |
9008 | struct io_uring_params __user *, params) | |
9009 | { | |
9010 | return io_uring_setup(entries, params); | |
9011 | } | |
9012 | ||
66f4af93 JA |
9013 | static int io_probe(struct io_ring_ctx *ctx, void __user *arg, unsigned nr_args) |
9014 | { | |
9015 | struct io_uring_probe *p; | |
9016 | size_t size; | |
9017 | int i, ret; | |
9018 | ||
9019 | size = struct_size(p, ops, nr_args); | |
9020 | if (size == SIZE_MAX) | |
9021 | return -EOVERFLOW; | |
9022 | p = kzalloc(size, GFP_KERNEL); | |
9023 | if (!p) | |
9024 | return -ENOMEM; | |
9025 | ||
9026 | ret = -EFAULT; | |
9027 | if (copy_from_user(p, arg, size)) | |
9028 | goto out; | |
9029 | ret = -EINVAL; | |
9030 | if (memchr_inv(p, 0, size)) | |
9031 | goto out; | |
9032 | ||
9033 | p->last_op = IORING_OP_LAST - 1; | |
9034 | if (nr_args > IORING_OP_LAST) | |
9035 | nr_args = IORING_OP_LAST; | |
9036 | ||
9037 | for (i = 0; i < nr_args; i++) { | |
9038 | p->ops[i].op = i; | |
9039 | if (!io_op_defs[i].not_supported) | |
9040 | p->ops[i].flags = IO_URING_OP_SUPPORTED; | |
9041 | } | |
9042 | p->ops_len = i; | |
9043 | ||
9044 | ret = 0; | |
9045 | if (copy_to_user(arg, p, size)) | |
9046 | ret = -EFAULT; | |
9047 | out: | |
9048 | kfree(p); | |
9049 | return ret; | |
9050 | } | |
9051 | ||
071698e1 JA |
9052 | static int io_register_personality(struct io_ring_ctx *ctx) |
9053 | { | |
9054 | const struct cred *creds = get_current_cred(); | |
9055 | int id; | |
9056 | ||
9057 | id = idr_alloc_cyclic(&ctx->personality_idr, (void *) creds, 1, | |
9058 | USHRT_MAX, GFP_KERNEL); | |
9059 | if (id < 0) | |
9060 | put_cred(creds); | |
9061 | return id; | |
9062 | } | |
9063 | ||
9064 | static int io_unregister_personality(struct io_ring_ctx *ctx, unsigned id) | |
9065 | { | |
9066 | const struct cred *old_creds; | |
9067 | ||
9068 | old_creds = idr_remove(&ctx->personality_idr, id); | |
9069 | if (old_creds) { | |
9070 | put_cred(old_creds); | |
9071 | return 0; | |
9072 | } | |
9073 | ||
9074 | return -EINVAL; | |
9075 | } | |
9076 | ||
9077 | static bool io_register_op_must_quiesce(int op) | |
9078 | { | |
9079 | switch (op) { | |
9080 | case IORING_UNREGISTER_FILES: | |
9081 | case IORING_REGISTER_FILES_UPDATE: | |
9082 | case IORING_REGISTER_PROBE: | |
9083 | case IORING_REGISTER_PERSONALITY: | |
9084 | case IORING_UNREGISTER_PERSONALITY: | |
9085 | return false; | |
9086 | default: | |
9087 | return true; | |
9088 | } | |
9089 | } | |
9090 | ||
edafccee JA |
9091 | static int __io_uring_register(struct io_ring_ctx *ctx, unsigned opcode, |
9092 | void __user *arg, unsigned nr_args) | |
b19062a5 JA |
9093 | __releases(ctx->uring_lock) |
9094 | __acquires(ctx->uring_lock) | |
edafccee JA |
9095 | { |
9096 | int ret; | |
9097 | ||
35fa71a0 JA |
9098 | /* |
9099 | * We're inside the ring mutex, if the ref is already dying, then | |
9100 | * someone else killed the ctx or is already going through | |
9101 | * io_uring_register(). | |
9102 | */ | |
9103 | if (percpu_ref_is_dying(&ctx->refs)) | |
9104 | return -ENXIO; | |
9105 | ||
071698e1 | 9106 | if (io_register_op_must_quiesce(opcode)) { |
05f3fb3c | 9107 | percpu_ref_kill(&ctx->refs); |
b19062a5 | 9108 | |
05f3fb3c JA |
9109 | /* |
9110 | * Drop uring mutex before waiting for references to exit. If | |
9111 | * another thread is currently inside io_uring_enter() it might | |
9112 | * need to grab the uring_lock to make progress. If we hold it | |
9113 | * here across the drain wait, then we can deadlock. It's safe | |
9114 | * to drop the mutex here, since no new references will come in | |
9115 | * after we've killed the percpu ref. | |
9116 | */ | |
9117 | mutex_unlock(&ctx->uring_lock); | |
0f158b4c | 9118 | ret = wait_for_completion_interruptible(&ctx->ref_comp); |
05f3fb3c | 9119 | mutex_lock(&ctx->uring_lock); |
c150368b JA |
9120 | if (ret) { |
9121 | percpu_ref_resurrect(&ctx->refs); | |
9122 | ret = -EINTR; | |
9123 | goto out; | |
9124 | } | |
05f3fb3c | 9125 | } |
edafccee JA |
9126 | |
9127 | switch (opcode) { | |
9128 | case IORING_REGISTER_BUFFERS: | |
9129 | ret = io_sqe_buffer_register(ctx, arg, nr_args); | |
9130 | break; | |
9131 | case IORING_UNREGISTER_BUFFERS: | |
9132 | ret = -EINVAL; | |
9133 | if (arg || nr_args) | |
9134 | break; | |
9135 | ret = io_sqe_buffer_unregister(ctx); | |
9136 | break; | |
6b06314c JA |
9137 | case IORING_REGISTER_FILES: |
9138 | ret = io_sqe_files_register(ctx, arg, nr_args); | |
9139 | break; | |
9140 | case IORING_UNREGISTER_FILES: | |
9141 | ret = -EINVAL; | |
9142 | if (arg || nr_args) | |
9143 | break; | |
9144 | ret = io_sqe_files_unregister(ctx); | |
9145 | break; | |
c3a31e60 JA |
9146 | case IORING_REGISTER_FILES_UPDATE: |
9147 | ret = io_sqe_files_update(ctx, arg, nr_args); | |
9148 | break; | |
9b402849 | 9149 | case IORING_REGISTER_EVENTFD: |
f2842ab5 | 9150 | case IORING_REGISTER_EVENTFD_ASYNC: |
9b402849 JA |
9151 | ret = -EINVAL; |
9152 | if (nr_args != 1) | |
9153 | break; | |
9154 | ret = io_eventfd_register(ctx, arg); | |
f2842ab5 JA |
9155 | if (ret) |
9156 | break; | |
9157 | if (opcode == IORING_REGISTER_EVENTFD_ASYNC) | |
9158 | ctx->eventfd_async = 1; | |
9159 | else | |
9160 | ctx->eventfd_async = 0; | |
9b402849 JA |
9161 | break; |
9162 | case IORING_UNREGISTER_EVENTFD: | |
9163 | ret = -EINVAL; | |
9164 | if (arg || nr_args) | |
9165 | break; | |
9166 | ret = io_eventfd_unregister(ctx); | |
9167 | break; | |
66f4af93 JA |
9168 | case IORING_REGISTER_PROBE: |
9169 | ret = -EINVAL; | |
9170 | if (!arg || nr_args > 256) | |
9171 | break; | |
9172 | ret = io_probe(ctx, arg, nr_args); | |
9173 | break; | |
071698e1 JA |
9174 | case IORING_REGISTER_PERSONALITY: |
9175 | ret = -EINVAL; | |
9176 | if (arg || nr_args) | |
9177 | break; | |
9178 | ret = io_register_personality(ctx); | |
9179 | break; | |
9180 | case IORING_UNREGISTER_PERSONALITY: | |
9181 | ret = -EINVAL; | |
9182 | if (arg) | |
9183 | break; | |
9184 | ret = io_unregister_personality(ctx, nr_args); | |
9185 | break; | |
edafccee JA |
9186 | default: |
9187 | ret = -EINVAL; | |
9188 | break; | |
9189 | } | |
9190 | ||
071698e1 | 9191 | if (io_register_op_must_quiesce(opcode)) { |
05f3fb3c | 9192 | /* bring the ctx back to life */ |
05f3fb3c | 9193 | percpu_ref_reinit(&ctx->refs); |
c150368b | 9194 | out: |
0f158b4c | 9195 | reinit_completion(&ctx->ref_comp); |
05f3fb3c | 9196 | } |
edafccee JA |
9197 | return ret; |
9198 | } | |
9199 | ||
9200 | SYSCALL_DEFINE4(io_uring_register, unsigned int, fd, unsigned int, opcode, | |
9201 | void __user *, arg, unsigned int, nr_args) | |
9202 | { | |
9203 | struct io_ring_ctx *ctx; | |
9204 | long ret = -EBADF; | |
9205 | struct fd f; | |
9206 | ||
9207 | f = fdget(fd); | |
9208 | if (!f.file) | |
9209 | return -EBADF; | |
9210 | ||
9211 | ret = -EOPNOTSUPP; | |
9212 | if (f.file->f_op != &io_uring_fops) | |
9213 | goto out_fput; | |
9214 | ||
9215 | ctx = f.file->private_data; | |
9216 | ||
9217 | mutex_lock(&ctx->uring_lock); | |
9218 | ret = __io_uring_register(ctx, opcode, arg, nr_args); | |
9219 | mutex_unlock(&ctx->uring_lock); | |
c826bd7a DD |
9220 | trace_io_uring_register(ctx, opcode, ctx->nr_user_files, ctx->nr_user_bufs, |
9221 | ctx->cq_ev_fd != NULL, ret); | |
edafccee JA |
9222 | out_fput: |
9223 | fdput(f); | |
9224 | return ret; | |
9225 | } | |
9226 | ||
2b188cc1 JA |
9227 | static int __init io_uring_init(void) |
9228 | { | |
d7f62e82 SM |
9229 | #define __BUILD_BUG_VERIFY_ELEMENT(stype, eoffset, etype, ename) do { \ |
9230 | BUILD_BUG_ON(offsetof(stype, ename) != eoffset); \ | |
9231 | BUILD_BUG_ON(sizeof(etype) != sizeof_field(stype, ename)); \ | |
9232 | } while (0) | |
9233 | ||
9234 | #define BUILD_BUG_SQE_ELEM(eoffset, etype, ename) \ | |
9235 | __BUILD_BUG_VERIFY_ELEMENT(struct io_uring_sqe, eoffset, etype, ename) | |
9236 | BUILD_BUG_ON(sizeof(struct io_uring_sqe) != 64); | |
9237 | BUILD_BUG_SQE_ELEM(0, __u8, opcode); | |
9238 | BUILD_BUG_SQE_ELEM(1, __u8, flags); | |
9239 | BUILD_BUG_SQE_ELEM(2, __u16, ioprio); | |
9240 | BUILD_BUG_SQE_ELEM(4, __s32, fd); | |
9241 | BUILD_BUG_SQE_ELEM(8, __u64, off); | |
9242 | BUILD_BUG_SQE_ELEM(8, __u64, addr2); | |
9243 | BUILD_BUG_SQE_ELEM(16, __u64, addr); | |
7d67af2c | 9244 | BUILD_BUG_SQE_ELEM(16, __u64, splice_off_in); |
d7f62e82 SM |
9245 | BUILD_BUG_SQE_ELEM(24, __u32, len); |
9246 | BUILD_BUG_SQE_ELEM(28, __kernel_rwf_t, rw_flags); | |
9247 | BUILD_BUG_SQE_ELEM(28, /* compat */ int, rw_flags); | |
9248 | BUILD_BUG_SQE_ELEM(28, /* compat */ __u32, rw_flags); | |
9249 | BUILD_BUG_SQE_ELEM(28, __u32, fsync_flags); | |
5769a351 JX |
9250 | BUILD_BUG_SQE_ELEM(28, /* compat */ __u16, poll_events); |
9251 | BUILD_BUG_SQE_ELEM(28, __u32, poll32_events); | |
d7f62e82 SM |
9252 | BUILD_BUG_SQE_ELEM(28, __u32, sync_range_flags); |
9253 | BUILD_BUG_SQE_ELEM(28, __u32, msg_flags); | |
9254 | BUILD_BUG_SQE_ELEM(28, __u32, timeout_flags); | |
9255 | BUILD_BUG_SQE_ELEM(28, __u32, accept_flags); | |
9256 | BUILD_BUG_SQE_ELEM(28, __u32, cancel_flags); | |
9257 | BUILD_BUG_SQE_ELEM(28, __u32, open_flags); | |
9258 | BUILD_BUG_SQE_ELEM(28, __u32, statx_flags); | |
9259 | BUILD_BUG_SQE_ELEM(28, __u32, fadvise_advice); | |
7d67af2c | 9260 | BUILD_BUG_SQE_ELEM(28, __u32, splice_flags); |
d7f62e82 SM |
9261 | BUILD_BUG_SQE_ELEM(32, __u64, user_data); |
9262 | BUILD_BUG_SQE_ELEM(40, __u16, buf_index); | |
9263 | BUILD_BUG_SQE_ELEM(42, __u16, personality); | |
7d67af2c | 9264 | BUILD_BUG_SQE_ELEM(44, __s32, splice_fd_in); |
d7f62e82 | 9265 | |
d3656344 | 9266 | BUILD_BUG_ON(ARRAY_SIZE(io_op_defs) != IORING_OP_LAST); |
84557871 | 9267 | BUILD_BUG_ON(__REQ_F_LAST_BIT >= 8 * sizeof(int)); |
2b188cc1 JA |
9268 | req_cachep = KMEM_CACHE(io_kiocb, SLAB_HWCACHE_ALIGN | SLAB_PANIC); |
9269 | return 0; | |
9270 | }; | |
9271 | __initcall(io_uring_init); |