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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> |
2b188cc1 | 82 | |
c826bd7a DD |
83 | #define CREATE_TRACE_POINTS |
84 | #include <trace/events/io_uring.h> | |
85 | ||
2b188cc1 JA |
86 | #include <uapi/linux/io_uring.h> |
87 | ||
88 | #include "internal.h" | |
561fb04a | 89 | #include "io-wq.h" |
2b188cc1 | 90 | |
5277deaa | 91 | #define IORING_MAX_ENTRIES 32768 |
33a107f0 | 92 | #define IORING_MAX_CQ_ENTRIES (2 * IORING_MAX_ENTRIES) |
65e19f54 JA |
93 | |
94 | /* | |
95 | * Shift of 9 is 512 entries, or exactly one page on 64-bit archs | |
96 | */ | |
97 | #define IORING_FILE_TABLE_SHIFT 9 | |
98 | #define IORING_MAX_FILES_TABLE (1U << IORING_FILE_TABLE_SHIFT) | |
99 | #define IORING_FILE_TABLE_MASK (IORING_MAX_FILES_TABLE - 1) | |
100 | #define IORING_MAX_FIXED_FILES (64 * IORING_MAX_FILES_TABLE) | |
2b188cc1 JA |
101 | |
102 | struct io_uring { | |
103 | u32 head ____cacheline_aligned_in_smp; | |
104 | u32 tail ____cacheline_aligned_in_smp; | |
105 | }; | |
106 | ||
1e84b97b | 107 | /* |
75b28aff HV |
108 | * This data is shared with the application through the mmap at offsets |
109 | * IORING_OFF_SQ_RING and IORING_OFF_CQ_RING. | |
1e84b97b SB |
110 | * |
111 | * The offsets to the member fields are published through struct | |
112 | * io_sqring_offsets when calling io_uring_setup. | |
113 | */ | |
75b28aff | 114 | struct io_rings { |
1e84b97b SB |
115 | /* |
116 | * Head and tail offsets into the ring; the offsets need to be | |
117 | * masked to get valid indices. | |
118 | * | |
75b28aff HV |
119 | * The kernel controls head of the sq ring and the tail of the cq ring, |
120 | * and the application controls tail of the sq ring and the head of the | |
121 | * cq ring. | |
1e84b97b | 122 | */ |
75b28aff | 123 | struct io_uring sq, cq; |
1e84b97b | 124 | /* |
75b28aff | 125 | * Bitmasks to apply to head and tail offsets (constant, equals |
1e84b97b SB |
126 | * ring_entries - 1) |
127 | */ | |
75b28aff HV |
128 | u32 sq_ring_mask, cq_ring_mask; |
129 | /* Ring sizes (constant, power of 2) */ | |
130 | u32 sq_ring_entries, cq_ring_entries; | |
1e84b97b SB |
131 | /* |
132 | * Number of invalid entries dropped by the kernel due to | |
133 | * invalid index stored in array | |
134 | * | |
135 | * Written by the kernel, shouldn't be modified by the | |
136 | * application (i.e. get number of "new events" by comparing to | |
137 | * cached value). | |
138 | * | |
139 | * After a new SQ head value was read by the application this | |
140 | * counter includes all submissions that were dropped reaching | |
141 | * the new SQ head (and possibly more). | |
142 | */ | |
75b28aff | 143 | u32 sq_dropped; |
1e84b97b | 144 | /* |
0d9b5b3a | 145 | * Runtime SQ flags |
1e84b97b SB |
146 | * |
147 | * Written by the kernel, shouldn't be modified by the | |
148 | * application. | |
149 | * | |
150 | * The application needs a full memory barrier before checking | |
151 | * for IORING_SQ_NEED_WAKEUP after updating the sq tail. | |
152 | */ | |
75b28aff | 153 | u32 sq_flags; |
0d9b5b3a SG |
154 | /* |
155 | * Runtime CQ flags | |
156 | * | |
157 | * Written by the application, shouldn't be modified by the | |
158 | * kernel. | |
159 | */ | |
160 | u32 cq_flags; | |
1e84b97b SB |
161 | /* |
162 | * Number of completion events lost because the queue was full; | |
163 | * this should be avoided by the application by making sure | |
0b4295b5 | 164 | * there are not more requests pending than there is space in |
1e84b97b SB |
165 | * the completion queue. |
166 | * | |
167 | * Written by the kernel, shouldn't be modified by the | |
168 | * application (i.e. get number of "new events" by comparing to | |
169 | * cached value). | |
170 | * | |
171 | * As completion events come in out of order this counter is not | |
172 | * ordered with any other data. | |
173 | */ | |
75b28aff | 174 | u32 cq_overflow; |
1e84b97b SB |
175 | /* |
176 | * Ring buffer of completion events. | |
177 | * | |
178 | * The kernel writes completion events fresh every time they are | |
179 | * produced, so the application is allowed to modify pending | |
180 | * entries. | |
181 | */ | |
75b28aff | 182 | struct io_uring_cqe cqes[] ____cacheline_aligned_in_smp; |
2b188cc1 JA |
183 | }; |
184 | ||
edafccee JA |
185 | struct io_mapped_ubuf { |
186 | u64 ubuf; | |
187 | size_t len; | |
188 | struct bio_vec *bvec; | |
189 | unsigned int nr_bvecs; | |
190 | }; | |
191 | ||
65e19f54 JA |
192 | struct fixed_file_table { |
193 | struct file **files; | |
31b51510 JA |
194 | }; |
195 | ||
05589553 XW |
196 | struct fixed_file_ref_node { |
197 | struct percpu_ref refs; | |
198 | struct list_head node; | |
199 | struct list_head file_list; | |
200 | struct fixed_file_data *file_data; | |
4a38aed2 | 201 | struct llist_node llist; |
05589553 XW |
202 | }; |
203 | ||
05f3fb3c JA |
204 | struct fixed_file_data { |
205 | struct fixed_file_table *table; | |
206 | struct io_ring_ctx *ctx; | |
207 | ||
05589553 | 208 | struct percpu_ref *cur_refs; |
05f3fb3c | 209 | struct percpu_ref refs; |
05f3fb3c | 210 | struct completion done; |
05589553 XW |
211 | struct list_head ref_list; |
212 | spinlock_t lock; | |
05f3fb3c JA |
213 | }; |
214 | ||
5a2e745d JA |
215 | struct io_buffer { |
216 | struct list_head list; | |
217 | __u64 addr; | |
218 | __s32 len; | |
219 | __u16 bid; | |
220 | }; | |
221 | ||
2b188cc1 JA |
222 | struct io_ring_ctx { |
223 | struct { | |
224 | struct percpu_ref refs; | |
225 | } ____cacheline_aligned_in_smp; | |
226 | ||
227 | struct { | |
228 | unsigned int flags; | |
e1d85334 | 229 | unsigned int compat: 1; |
aad5d8da | 230 | unsigned int limit_mem: 1; |
e1d85334 RD |
231 | unsigned int cq_overflow_flushed: 1; |
232 | unsigned int drain_next: 1; | |
233 | unsigned int eventfd_async: 1; | |
2b188cc1 | 234 | |
75b28aff HV |
235 | /* |
236 | * Ring buffer of indices into array of io_uring_sqe, which is | |
237 | * mmapped by the application using the IORING_OFF_SQES offset. | |
238 | * | |
239 | * This indirection could e.g. be used to assign fixed | |
240 | * io_uring_sqe entries to operations and only submit them to | |
241 | * the queue when needed. | |
242 | * | |
243 | * The kernel modifies neither the indices array nor the entries | |
244 | * array. | |
245 | */ | |
246 | u32 *sq_array; | |
2b188cc1 JA |
247 | unsigned cached_sq_head; |
248 | unsigned sq_entries; | |
249 | unsigned sq_mask; | |
6c271ce2 | 250 | unsigned sq_thread_idle; |
498ccd9e | 251 | unsigned cached_sq_dropped; |
206aefde | 252 | atomic_t cached_cq_overflow; |
ad3eb2c8 | 253 | unsigned long sq_check_overflow; |
de0617e4 JA |
254 | |
255 | struct list_head defer_list; | |
5262f567 | 256 | struct list_head timeout_list; |
1d7bb1d5 | 257 | struct list_head cq_overflow_list; |
fcb323cc JA |
258 | |
259 | wait_queue_head_t inflight_wait; | |
ad3eb2c8 | 260 | struct io_uring_sqe *sq_sqes; |
2b188cc1 JA |
261 | } ____cacheline_aligned_in_smp; |
262 | ||
206aefde JA |
263 | struct io_rings *rings; |
264 | ||
2b188cc1 | 265 | /* IO offload */ |
561fb04a | 266 | struct io_wq *io_wq; |
6c271ce2 | 267 | struct task_struct *sqo_thread; /* if using sq thread polling */ |
2b188cc1 | 268 | struct mm_struct *sqo_mm; |
6c271ce2 | 269 | wait_queue_head_t sqo_wait; |
75b28aff | 270 | |
6b06314c JA |
271 | /* |
272 | * If used, fixed file set. Writers must ensure that ->refs is dead, | |
273 | * readers must ensure that ->refs is alive as long as the file* is | |
274 | * used. Only updated through io_uring_register(2). | |
275 | */ | |
05f3fb3c | 276 | struct fixed_file_data *file_data; |
6b06314c | 277 | unsigned nr_user_files; |
b14cca0c PB |
278 | int ring_fd; |
279 | struct file *ring_file; | |
6b06314c | 280 | |
edafccee JA |
281 | /* if used, fixed mapped user buffers */ |
282 | unsigned nr_user_bufs; | |
283 | struct io_mapped_ubuf *user_bufs; | |
284 | ||
2b188cc1 JA |
285 | struct user_struct *user; |
286 | ||
0b8c0ec7 | 287 | const struct cred *creds; |
181e448d | 288 | |
0f158b4c JA |
289 | struct completion ref_comp; |
290 | struct completion sq_thread_comp; | |
206aefde | 291 | |
0ddf92e8 JA |
292 | /* if all else fails... */ |
293 | struct io_kiocb *fallback_req; | |
294 | ||
206aefde JA |
295 | #if defined(CONFIG_UNIX) |
296 | struct socket *ring_sock; | |
297 | #endif | |
298 | ||
5a2e745d JA |
299 | struct idr io_buffer_idr; |
300 | ||
071698e1 JA |
301 | struct idr personality_idr; |
302 | ||
206aefde JA |
303 | struct { |
304 | unsigned cached_cq_tail; | |
305 | unsigned cq_entries; | |
306 | unsigned cq_mask; | |
307 | atomic_t cq_timeouts; | |
ad3eb2c8 | 308 | unsigned long cq_check_overflow; |
206aefde JA |
309 | struct wait_queue_head cq_wait; |
310 | struct fasync_struct *cq_fasync; | |
311 | struct eventfd_ctx *cq_ev_fd; | |
312 | } ____cacheline_aligned_in_smp; | |
2b188cc1 JA |
313 | |
314 | struct { | |
315 | struct mutex uring_lock; | |
316 | wait_queue_head_t wait; | |
317 | } ____cacheline_aligned_in_smp; | |
318 | ||
319 | struct { | |
320 | spinlock_t completion_lock; | |
e94f141b | 321 | |
def596e9 | 322 | /* |
540e32a0 | 323 | * ->iopoll_list is protected by the ctx->uring_lock for |
def596e9 JA |
324 | * io_uring instances that don't use IORING_SETUP_SQPOLL. |
325 | * For SQPOLL, only the single threaded io_sq_thread() will | |
326 | * manipulate the list, hence no extra locking is needed there. | |
327 | */ | |
540e32a0 | 328 | struct list_head iopoll_list; |
78076bb6 JA |
329 | struct hlist_head *cancel_hash; |
330 | unsigned cancel_hash_bits; | |
e94f141b | 331 | bool poll_multi_file; |
31b51510 | 332 | |
fcb323cc JA |
333 | spinlock_t inflight_lock; |
334 | struct list_head inflight_list; | |
2b188cc1 | 335 | } ____cacheline_aligned_in_smp; |
85faa7b8 | 336 | |
4a38aed2 JA |
337 | struct delayed_work file_put_work; |
338 | struct llist_head file_put_llist; | |
339 | ||
85faa7b8 | 340 | struct work_struct exit_work; |
2b188cc1 JA |
341 | }; |
342 | ||
09bb8394 JA |
343 | /* |
344 | * First field must be the file pointer in all the | |
345 | * iocb unions! See also 'struct kiocb' in <linux/fs.h> | |
346 | */ | |
221c5eb2 JA |
347 | struct io_poll_iocb { |
348 | struct file *file; | |
0969e783 JA |
349 | union { |
350 | struct wait_queue_head *head; | |
351 | u64 addr; | |
352 | }; | |
221c5eb2 | 353 | __poll_t events; |
8c838788 | 354 | bool done; |
221c5eb2 | 355 | bool canceled; |
392edb45 | 356 | struct wait_queue_entry wait; |
221c5eb2 JA |
357 | }; |
358 | ||
b5dba59e JA |
359 | struct io_close { |
360 | struct file *file; | |
361 | struct file *put_file; | |
362 | int fd; | |
363 | }; | |
364 | ||
ad8a48ac JA |
365 | struct io_timeout_data { |
366 | struct io_kiocb *req; | |
367 | struct hrtimer timer; | |
368 | struct timespec64 ts; | |
369 | enum hrtimer_mode mode; | |
370 | }; | |
371 | ||
8ed8d3c3 JA |
372 | struct io_accept { |
373 | struct file *file; | |
374 | struct sockaddr __user *addr; | |
375 | int __user *addr_len; | |
376 | int flags; | |
09952e3e | 377 | unsigned long nofile; |
8ed8d3c3 JA |
378 | }; |
379 | ||
380 | struct io_sync { | |
381 | struct file *file; | |
382 | loff_t len; | |
383 | loff_t off; | |
384 | int flags; | |
d63d1b5e | 385 | int mode; |
8ed8d3c3 JA |
386 | }; |
387 | ||
fbf23849 JA |
388 | struct io_cancel { |
389 | struct file *file; | |
390 | u64 addr; | |
391 | }; | |
392 | ||
b29472ee JA |
393 | struct io_timeout { |
394 | struct file *file; | |
395 | u64 addr; | |
396 | int flags; | |
bfe68a22 PB |
397 | u32 off; |
398 | u32 target_seq; | |
135fcde8 | 399 | struct list_head list; |
b29472ee JA |
400 | }; |
401 | ||
9adbd45d JA |
402 | struct io_rw { |
403 | /* NOTE: kiocb has the file as the first member, so don't do it here */ | |
404 | struct kiocb kiocb; | |
405 | u64 addr; | |
406 | u64 len; | |
407 | }; | |
408 | ||
3fbb51c1 JA |
409 | struct io_connect { |
410 | struct file *file; | |
411 | struct sockaddr __user *addr; | |
412 | int addr_len; | |
413 | }; | |
414 | ||
e47293fd JA |
415 | struct io_sr_msg { |
416 | struct file *file; | |
fddaface | 417 | union { |
270a5940 | 418 | struct user_msghdr __user *umsg; |
fddaface JA |
419 | void __user *buf; |
420 | }; | |
e47293fd | 421 | int msg_flags; |
bcda7baa | 422 | int bgid; |
fddaface | 423 | size_t len; |
bcda7baa | 424 | struct io_buffer *kbuf; |
e47293fd JA |
425 | }; |
426 | ||
15b71abe JA |
427 | struct io_open { |
428 | struct file *file; | |
429 | int dfd; | |
15b71abe | 430 | struct filename *filename; |
c12cedf2 | 431 | struct open_how how; |
4022e7af | 432 | unsigned long nofile; |
15b71abe JA |
433 | }; |
434 | ||
05f3fb3c JA |
435 | struct io_files_update { |
436 | struct file *file; | |
437 | u64 arg; | |
438 | u32 nr_args; | |
439 | u32 offset; | |
440 | }; | |
441 | ||
4840e418 JA |
442 | struct io_fadvise { |
443 | struct file *file; | |
444 | u64 offset; | |
445 | u32 len; | |
446 | u32 advice; | |
447 | }; | |
448 | ||
c1ca757b JA |
449 | struct io_madvise { |
450 | struct file *file; | |
451 | u64 addr; | |
452 | u32 len; | |
453 | u32 advice; | |
454 | }; | |
455 | ||
3e4827b0 JA |
456 | struct io_epoll { |
457 | struct file *file; | |
458 | int epfd; | |
459 | int op; | |
460 | int fd; | |
461 | struct epoll_event event; | |
e47293fd JA |
462 | }; |
463 | ||
7d67af2c PB |
464 | struct io_splice { |
465 | struct file *file_out; | |
466 | struct file *file_in; | |
467 | loff_t off_out; | |
468 | loff_t off_in; | |
469 | u64 len; | |
470 | unsigned int flags; | |
471 | }; | |
472 | ||
ddf0322d JA |
473 | struct io_provide_buf { |
474 | struct file *file; | |
475 | __u64 addr; | |
476 | __s32 len; | |
477 | __u32 bgid; | |
478 | __u16 nbufs; | |
479 | __u16 bid; | |
480 | }; | |
481 | ||
1d9e1288 BM |
482 | struct io_statx { |
483 | struct file *file; | |
484 | int dfd; | |
485 | unsigned int mask; | |
486 | unsigned int flags; | |
e62753e4 | 487 | const char __user *filename; |
1d9e1288 BM |
488 | struct statx __user *buffer; |
489 | }; | |
490 | ||
3ca405eb PB |
491 | struct io_completion { |
492 | struct file *file; | |
493 | struct list_head list; | |
0f7e466b | 494 | int cflags; |
3ca405eb PB |
495 | }; |
496 | ||
f499a021 JA |
497 | struct io_async_connect { |
498 | struct sockaddr_storage address; | |
499 | }; | |
500 | ||
03b1230c JA |
501 | struct io_async_msghdr { |
502 | struct iovec fast_iov[UIO_FASTIOV]; | |
503 | struct iovec *iov; | |
504 | struct sockaddr __user *uaddr; | |
505 | struct msghdr msg; | |
b537916c | 506 | struct sockaddr_storage addr; |
03b1230c JA |
507 | }; |
508 | ||
f67676d1 JA |
509 | struct io_async_rw { |
510 | struct iovec fast_iov[UIO_FASTIOV]; | |
511 | struct iovec *iov; | |
512 | ssize_t nr_segs; | |
513 | ssize_t size; | |
bcf5a063 | 514 | struct wait_page_queue wpq; |
f67676d1 JA |
515 | }; |
516 | ||
1a6b74fc | 517 | struct io_async_ctx { |
f67676d1 JA |
518 | union { |
519 | struct io_async_rw rw; | |
03b1230c | 520 | struct io_async_msghdr msg; |
f499a021 | 521 | struct io_async_connect connect; |
2d28390a | 522 | struct io_timeout_data timeout; |
f67676d1 | 523 | }; |
1a6b74fc JA |
524 | }; |
525 | ||
6b47ee6e PB |
526 | enum { |
527 | REQ_F_FIXED_FILE_BIT = IOSQE_FIXED_FILE_BIT, | |
528 | REQ_F_IO_DRAIN_BIT = IOSQE_IO_DRAIN_BIT, | |
529 | REQ_F_LINK_BIT = IOSQE_IO_LINK_BIT, | |
530 | REQ_F_HARDLINK_BIT = IOSQE_IO_HARDLINK_BIT, | |
531 | REQ_F_FORCE_ASYNC_BIT = IOSQE_ASYNC_BIT, | |
bcda7baa | 532 | REQ_F_BUFFER_SELECT_BIT = IOSQE_BUFFER_SELECT_BIT, |
6b47ee6e | 533 | |
dea3b49c | 534 | REQ_F_LINK_HEAD_BIT, |
6b47ee6e PB |
535 | REQ_F_FAIL_LINK_BIT, |
536 | REQ_F_INFLIGHT_BIT, | |
537 | REQ_F_CUR_POS_BIT, | |
538 | REQ_F_NOWAIT_BIT, | |
6b47ee6e | 539 | REQ_F_LINK_TIMEOUT_BIT, |
6b47ee6e | 540 | REQ_F_ISREG_BIT, |
6b47ee6e | 541 | REQ_F_COMP_LOCKED_BIT, |
99bc4c38 | 542 | REQ_F_NEED_CLEANUP_BIT, |
2ca10259 | 543 | REQ_F_OVERFLOW_BIT, |
d7718a9d | 544 | REQ_F_POLLED_BIT, |
bcda7baa | 545 | REQ_F_BUFFER_SELECTED_BIT, |
5b0bbee4 | 546 | REQ_F_NO_FILE_TABLE_BIT, |
7cdaf587 | 547 | REQ_F_WORK_INITIALIZED_BIT, |
4dd2824d | 548 | REQ_F_TASK_PINNED_BIT, |
84557871 JA |
549 | |
550 | /* not a real bit, just to check we're not overflowing the space */ | |
551 | __REQ_F_LAST_BIT, | |
6b47ee6e PB |
552 | }; |
553 | ||
554 | enum { | |
555 | /* ctx owns file */ | |
556 | REQ_F_FIXED_FILE = BIT(REQ_F_FIXED_FILE_BIT), | |
557 | /* drain existing IO first */ | |
558 | REQ_F_IO_DRAIN = BIT(REQ_F_IO_DRAIN_BIT), | |
559 | /* linked sqes */ | |
560 | REQ_F_LINK = BIT(REQ_F_LINK_BIT), | |
561 | /* doesn't sever on completion < 0 */ | |
562 | REQ_F_HARDLINK = BIT(REQ_F_HARDLINK_BIT), | |
563 | /* IOSQE_ASYNC */ | |
564 | REQ_F_FORCE_ASYNC = BIT(REQ_F_FORCE_ASYNC_BIT), | |
bcda7baa JA |
565 | /* IOSQE_BUFFER_SELECT */ |
566 | REQ_F_BUFFER_SELECT = BIT(REQ_F_BUFFER_SELECT_BIT), | |
6b47ee6e | 567 | |
dea3b49c PB |
568 | /* head of a link */ |
569 | REQ_F_LINK_HEAD = BIT(REQ_F_LINK_HEAD_BIT), | |
6b47ee6e PB |
570 | /* fail rest of links */ |
571 | REQ_F_FAIL_LINK = BIT(REQ_F_FAIL_LINK_BIT), | |
572 | /* on inflight list */ | |
573 | REQ_F_INFLIGHT = BIT(REQ_F_INFLIGHT_BIT), | |
574 | /* read/write uses file position */ | |
575 | REQ_F_CUR_POS = BIT(REQ_F_CUR_POS_BIT), | |
576 | /* must not punt to workers */ | |
577 | REQ_F_NOWAIT = BIT(REQ_F_NOWAIT_BIT), | |
6b47ee6e PB |
578 | /* has linked timeout */ |
579 | REQ_F_LINK_TIMEOUT = BIT(REQ_F_LINK_TIMEOUT_BIT), | |
6b47ee6e PB |
580 | /* regular file */ |
581 | REQ_F_ISREG = BIT(REQ_F_ISREG_BIT), | |
6b47ee6e PB |
582 | /* completion under lock */ |
583 | REQ_F_COMP_LOCKED = BIT(REQ_F_COMP_LOCKED_BIT), | |
99bc4c38 PB |
584 | /* needs cleanup */ |
585 | REQ_F_NEED_CLEANUP = BIT(REQ_F_NEED_CLEANUP_BIT), | |
2ca10259 JA |
586 | /* in overflow list */ |
587 | REQ_F_OVERFLOW = BIT(REQ_F_OVERFLOW_BIT), | |
d7718a9d JA |
588 | /* already went through poll handler */ |
589 | REQ_F_POLLED = BIT(REQ_F_POLLED_BIT), | |
bcda7baa JA |
590 | /* buffer already selected */ |
591 | REQ_F_BUFFER_SELECTED = BIT(REQ_F_BUFFER_SELECTED_BIT), | |
5b0bbee4 JA |
592 | /* doesn't need file table for this request */ |
593 | REQ_F_NO_FILE_TABLE = BIT(REQ_F_NO_FILE_TABLE_BIT), | |
7cdaf587 XW |
594 | /* io_wq_work is initialized */ |
595 | REQ_F_WORK_INITIALIZED = BIT(REQ_F_WORK_INITIALIZED_BIT), | |
4dd2824d PB |
596 | /* req->task is refcounted */ |
597 | REQ_F_TASK_PINNED = BIT(REQ_F_TASK_PINNED_BIT), | |
d7718a9d JA |
598 | }; |
599 | ||
600 | struct async_poll { | |
601 | struct io_poll_iocb poll; | |
807abcb0 | 602 | struct io_poll_iocb *double_poll; |
6b47ee6e PB |
603 | }; |
604 | ||
09bb8394 JA |
605 | /* |
606 | * NOTE! Each of the iocb union members has the file pointer | |
607 | * as the first entry in their struct definition. So you can | |
608 | * access the file pointer through any of the sub-structs, | |
609 | * or directly as just 'ki_filp' in this struct. | |
610 | */ | |
2b188cc1 | 611 | struct io_kiocb { |
221c5eb2 | 612 | union { |
09bb8394 | 613 | struct file *file; |
9adbd45d | 614 | struct io_rw rw; |
221c5eb2 | 615 | struct io_poll_iocb poll; |
8ed8d3c3 JA |
616 | struct io_accept accept; |
617 | struct io_sync sync; | |
fbf23849 | 618 | struct io_cancel cancel; |
b29472ee | 619 | struct io_timeout timeout; |
3fbb51c1 | 620 | struct io_connect connect; |
e47293fd | 621 | struct io_sr_msg sr_msg; |
15b71abe | 622 | struct io_open open; |
b5dba59e | 623 | struct io_close close; |
05f3fb3c | 624 | struct io_files_update files_update; |
4840e418 | 625 | struct io_fadvise fadvise; |
c1ca757b | 626 | struct io_madvise madvise; |
3e4827b0 | 627 | struct io_epoll epoll; |
7d67af2c | 628 | struct io_splice splice; |
ddf0322d | 629 | struct io_provide_buf pbuf; |
1d9e1288 | 630 | struct io_statx statx; |
3ca405eb PB |
631 | /* use only after cleaning per-op data, see io_clean_op() */ |
632 | struct io_completion compl; | |
221c5eb2 | 633 | }; |
2b188cc1 | 634 | |
1a6b74fc | 635 | struct io_async_ctx *io; |
d625c6ee | 636 | u8 opcode; |
65a6543d XW |
637 | /* polled IO has completed */ |
638 | u8 iopoll_completed; | |
2b188cc1 | 639 | |
4f4eeba8 | 640 | u16 buf_index; |
9cf7c104 | 641 | u32 result; |
4f4eeba8 | 642 | |
010e8e6b PB |
643 | struct io_ring_ctx *ctx; |
644 | unsigned int flags; | |
645 | refcount_t refs; | |
646 | struct task_struct *task; | |
647 | u64 user_data; | |
d7718a9d | 648 | |
010e8e6b | 649 | struct list_head link_list; |
fcb323cc | 650 | |
d21ffe7e PB |
651 | /* |
652 | * 1. used with ctx->iopoll_list with reads/writes | |
653 | * 2. to track reqs with ->files (see io_op_def::file_table) | |
654 | */ | |
010e8e6b PB |
655 | struct list_head inflight_entry; |
656 | ||
657 | struct percpu_ref *fixed_file_refs; | |
658 | struct callback_head task_work; | |
659 | /* for polled requests, i.e. IORING_OP_POLL_ADD and async armed poll */ | |
660 | struct hlist_node hash_node; | |
661 | struct async_poll *apoll; | |
662 | struct io_wq_work work; | |
2b188cc1 | 663 | }; |
05589553 | 664 | |
27dc8338 PB |
665 | struct io_defer_entry { |
666 | struct list_head list; | |
667 | struct io_kiocb *req; | |
9cf7c104 | 668 | u32 seq; |
2b188cc1 JA |
669 | }; |
670 | ||
def596e9 | 671 | #define IO_IOPOLL_BATCH 8 |
2b188cc1 | 672 | |
013538bd JA |
673 | struct io_comp_state { |
674 | unsigned int nr; | |
675 | struct list_head list; | |
676 | struct io_ring_ctx *ctx; | |
677 | }; | |
678 | ||
9a56a232 JA |
679 | struct io_submit_state { |
680 | struct blk_plug plug; | |
681 | ||
2579f913 JA |
682 | /* |
683 | * io_kiocb alloc cache | |
684 | */ | |
685 | void *reqs[IO_IOPOLL_BATCH]; | |
6c8a3134 | 686 | unsigned int free_reqs; |
2579f913 | 687 | |
013538bd JA |
688 | /* |
689 | * Batch completion logic | |
690 | */ | |
691 | struct io_comp_state comp; | |
692 | ||
9a56a232 JA |
693 | /* |
694 | * File reference cache | |
695 | */ | |
696 | struct file *file; | |
697 | unsigned int fd; | |
698 | unsigned int has_refs; | |
9a56a232 JA |
699 | unsigned int ios_left; |
700 | }; | |
701 | ||
d3656344 JA |
702 | struct io_op_def { |
703 | /* needs req->io allocated for deferral/async */ | |
704 | unsigned async_ctx : 1; | |
705 | /* needs current->mm setup, does mm access */ | |
706 | unsigned needs_mm : 1; | |
707 | /* needs req->file assigned */ | |
708 | unsigned needs_file : 1; | |
fd2206e4 JA |
709 | /* don't fail if file grab fails */ |
710 | unsigned needs_file_no_error : 1; | |
d3656344 JA |
711 | /* hash wq insertion if file is a regular file */ |
712 | unsigned hash_reg_file : 1; | |
713 | /* unbound wq insertion if file is a non-regular file */ | |
714 | unsigned unbound_nonreg_file : 1; | |
66f4af93 JA |
715 | /* opcode is not supported by this kernel */ |
716 | unsigned not_supported : 1; | |
f86cd20c JA |
717 | /* needs file table */ |
718 | unsigned file_table : 1; | |
ff002b30 JA |
719 | /* needs ->fs */ |
720 | unsigned needs_fs : 1; | |
8a72758c JA |
721 | /* set if opcode supports polled "wait" */ |
722 | unsigned pollin : 1; | |
723 | unsigned pollout : 1; | |
bcda7baa JA |
724 | /* op supports buffer selection */ |
725 | unsigned buffer_select : 1; | |
57f1a649 | 726 | unsigned needs_fsize : 1; |
d3656344 JA |
727 | }; |
728 | ||
729 | static const struct io_op_def io_op_defs[] = { | |
0463b6c5 PB |
730 | [IORING_OP_NOP] = {}, |
731 | [IORING_OP_READV] = { | |
d3656344 JA |
732 | .async_ctx = 1, |
733 | .needs_mm = 1, | |
734 | .needs_file = 1, | |
735 | .unbound_nonreg_file = 1, | |
8a72758c | 736 | .pollin = 1, |
4d954c25 | 737 | .buffer_select = 1, |
d3656344 | 738 | }, |
0463b6c5 | 739 | [IORING_OP_WRITEV] = { |
d3656344 JA |
740 | .async_ctx = 1, |
741 | .needs_mm = 1, | |
742 | .needs_file = 1, | |
743 | .hash_reg_file = 1, | |
744 | .unbound_nonreg_file = 1, | |
8a72758c | 745 | .pollout = 1, |
57f1a649 | 746 | .needs_fsize = 1, |
d3656344 | 747 | }, |
0463b6c5 | 748 | [IORING_OP_FSYNC] = { |
d3656344 JA |
749 | .needs_file = 1, |
750 | }, | |
0463b6c5 | 751 | [IORING_OP_READ_FIXED] = { |
d3656344 JA |
752 | .needs_file = 1, |
753 | .unbound_nonreg_file = 1, | |
8a72758c | 754 | .pollin = 1, |
d3656344 | 755 | }, |
0463b6c5 | 756 | [IORING_OP_WRITE_FIXED] = { |
d3656344 JA |
757 | .needs_file = 1, |
758 | .hash_reg_file = 1, | |
759 | .unbound_nonreg_file = 1, | |
8a72758c | 760 | .pollout = 1, |
57f1a649 | 761 | .needs_fsize = 1, |
d3656344 | 762 | }, |
0463b6c5 | 763 | [IORING_OP_POLL_ADD] = { |
d3656344 JA |
764 | .needs_file = 1, |
765 | .unbound_nonreg_file = 1, | |
766 | }, | |
0463b6c5 PB |
767 | [IORING_OP_POLL_REMOVE] = {}, |
768 | [IORING_OP_SYNC_FILE_RANGE] = { | |
d3656344 JA |
769 | .needs_file = 1, |
770 | }, | |
0463b6c5 | 771 | [IORING_OP_SENDMSG] = { |
d3656344 JA |
772 | .async_ctx = 1, |
773 | .needs_mm = 1, | |
774 | .needs_file = 1, | |
775 | .unbound_nonreg_file = 1, | |
ff002b30 | 776 | .needs_fs = 1, |
8a72758c | 777 | .pollout = 1, |
d3656344 | 778 | }, |
0463b6c5 | 779 | [IORING_OP_RECVMSG] = { |
d3656344 JA |
780 | .async_ctx = 1, |
781 | .needs_mm = 1, | |
782 | .needs_file = 1, | |
783 | .unbound_nonreg_file = 1, | |
ff002b30 | 784 | .needs_fs = 1, |
8a72758c | 785 | .pollin = 1, |
52de1fe1 | 786 | .buffer_select = 1, |
d3656344 | 787 | }, |
0463b6c5 | 788 | [IORING_OP_TIMEOUT] = { |
d3656344 JA |
789 | .async_ctx = 1, |
790 | .needs_mm = 1, | |
791 | }, | |
0463b6c5 PB |
792 | [IORING_OP_TIMEOUT_REMOVE] = {}, |
793 | [IORING_OP_ACCEPT] = { | |
d3656344 JA |
794 | .needs_mm = 1, |
795 | .needs_file = 1, | |
796 | .unbound_nonreg_file = 1, | |
f86cd20c | 797 | .file_table = 1, |
8a72758c | 798 | .pollin = 1, |
d3656344 | 799 | }, |
0463b6c5 PB |
800 | [IORING_OP_ASYNC_CANCEL] = {}, |
801 | [IORING_OP_LINK_TIMEOUT] = { | |
d3656344 JA |
802 | .async_ctx = 1, |
803 | .needs_mm = 1, | |
804 | }, | |
0463b6c5 | 805 | [IORING_OP_CONNECT] = { |
d3656344 JA |
806 | .async_ctx = 1, |
807 | .needs_mm = 1, | |
808 | .needs_file = 1, | |
809 | .unbound_nonreg_file = 1, | |
8a72758c | 810 | .pollout = 1, |
d3656344 | 811 | }, |
0463b6c5 | 812 | [IORING_OP_FALLOCATE] = { |
d3656344 | 813 | .needs_file = 1, |
57f1a649 | 814 | .needs_fsize = 1, |
d3656344 | 815 | }, |
0463b6c5 | 816 | [IORING_OP_OPENAT] = { |
f86cd20c | 817 | .file_table = 1, |
ff002b30 | 818 | .needs_fs = 1, |
d3656344 | 819 | }, |
0463b6c5 | 820 | [IORING_OP_CLOSE] = { |
fd2206e4 JA |
821 | .needs_file = 1, |
822 | .needs_file_no_error = 1, | |
f86cd20c | 823 | .file_table = 1, |
d3656344 | 824 | }, |
0463b6c5 | 825 | [IORING_OP_FILES_UPDATE] = { |
d3656344 | 826 | .needs_mm = 1, |
f86cd20c | 827 | .file_table = 1, |
d3656344 | 828 | }, |
0463b6c5 | 829 | [IORING_OP_STATX] = { |
d3656344 | 830 | .needs_mm = 1, |
ff002b30 | 831 | .needs_fs = 1, |
5b0bbee4 | 832 | .file_table = 1, |
d3656344 | 833 | }, |
0463b6c5 | 834 | [IORING_OP_READ] = { |
3a6820f2 JA |
835 | .needs_mm = 1, |
836 | .needs_file = 1, | |
837 | .unbound_nonreg_file = 1, | |
8a72758c | 838 | .pollin = 1, |
bcda7baa | 839 | .buffer_select = 1, |
3a6820f2 | 840 | }, |
0463b6c5 | 841 | [IORING_OP_WRITE] = { |
3a6820f2 JA |
842 | .needs_mm = 1, |
843 | .needs_file = 1, | |
844 | .unbound_nonreg_file = 1, | |
8a72758c | 845 | .pollout = 1, |
57f1a649 | 846 | .needs_fsize = 1, |
3a6820f2 | 847 | }, |
0463b6c5 | 848 | [IORING_OP_FADVISE] = { |
4840e418 JA |
849 | .needs_file = 1, |
850 | }, | |
0463b6c5 | 851 | [IORING_OP_MADVISE] = { |
c1ca757b JA |
852 | .needs_mm = 1, |
853 | }, | |
0463b6c5 | 854 | [IORING_OP_SEND] = { |
fddaface JA |
855 | .needs_mm = 1, |
856 | .needs_file = 1, | |
857 | .unbound_nonreg_file = 1, | |
8a72758c | 858 | .pollout = 1, |
fddaface | 859 | }, |
0463b6c5 | 860 | [IORING_OP_RECV] = { |
fddaface JA |
861 | .needs_mm = 1, |
862 | .needs_file = 1, | |
863 | .unbound_nonreg_file = 1, | |
8a72758c | 864 | .pollin = 1, |
bcda7baa | 865 | .buffer_select = 1, |
fddaface | 866 | }, |
0463b6c5 | 867 | [IORING_OP_OPENAT2] = { |
f86cd20c | 868 | .file_table = 1, |
ff002b30 | 869 | .needs_fs = 1, |
cebdb986 | 870 | }, |
3e4827b0 JA |
871 | [IORING_OP_EPOLL_CTL] = { |
872 | .unbound_nonreg_file = 1, | |
873 | .file_table = 1, | |
874 | }, | |
7d67af2c PB |
875 | [IORING_OP_SPLICE] = { |
876 | .needs_file = 1, | |
877 | .hash_reg_file = 1, | |
878 | .unbound_nonreg_file = 1, | |
ddf0322d JA |
879 | }, |
880 | [IORING_OP_PROVIDE_BUFFERS] = {}, | |
067524e9 | 881 | [IORING_OP_REMOVE_BUFFERS] = {}, |
f2a8d5c7 PB |
882 | [IORING_OP_TEE] = { |
883 | .needs_file = 1, | |
884 | .hash_reg_file = 1, | |
885 | .unbound_nonreg_file = 1, | |
886 | }, | |
d3656344 JA |
887 | }; |
888 | ||
2e0464d4 BM |
889 | enum io_mem_account { |
890 | ACCT_LOCKED, | |
891 | ACCT_PINNED, | |
892 | }; | |
893 | ||
81b68a5c PB |
894 | static void __io_complete_rw(struct io_kiocb *req, long res, long res2, |
895 | struct io_comp_state *cs); | |
78e19bbe | 896 | static void io_cqring_fill_event(struct io_kiocb *req, long res); |
ec9c02ad | 897 | static void io_put_req(struct io_kiocb *req); |
c40f6379 | 898 | static void io_double_put_req(struct io_kiocb *req); |
978db57e | 899 | static void __io_double_put_req(struct io_kiocb *req); |
94ae5e77 | 900 | static struct io_kiocb *io_prep_linked_timeout(struct io_kiocb *req); |
7271ef3a | 901 | static void __io_queue_linked_timeout(struct io_kiocb *req); |
94ae5e77 | 902 | static void io_queue_linked_timeout(struct io_kiocb *req); |
05f3fb3c JA |
903 | static int __io_sqe_files_update(struct io_ring_ctx *ctx, |
904 | struct io_uring_files_update *ip, | |
905 | unsigned nr_args); | |
f56040b8 | 906 | static int io_prep_work_files(struct io_kiocb *req); |
3ca405eb | 907 | static void __io_clean_op(struct io_kiocb *req); |
b41e9852 JA |
908 | static int io_file_get(struct io_submit_state *state, struct io_kiocb *req, |
909 | int fd, struct file **out_file, bool fixed); | |
910 | static void __io_queue_sqe(struct io_kiocb *req, | |
f13fad7b JA |
911 | const struct io_uring_sqe *sqe, |
912 | struct io_comp_state *cs); | |
4349f30e | 913 | static void io_file_put_work(struct work_struct *work); |
de0617e4 | 914 | |
b63534c4 JA |
915 | static ssize_t io_import_iovec(int rw, struct io_kiocb *req, |
916 | struct iovec **iovec, struct iov_iter *iter, | |
917 | bool needs_lock); | |
918 | static int io_setup_async_rw(struct io_kiocb *req, ssize_t io_size, | |
919 | struct iovec *iovec, struct iovec *fast_iov, | |
920 | struct iov_iter *iter); | |
de0617e4 | 921 | |
2b188cc1 JA |
922 | static struct kmem_cache *req_cachep; |
923 | ||
924 | static const struct file_operations io_uring_fops; | |
925 | ||
926 | struct sock *io_uring_get_socket(struct file *file) | |
927 | { | |
928 | #if defined(CONFIG_UNIX) | |
929 | if (file->f_op == &io_uring_fops) { | |
930 | struct io_ring_ctx *ctx = file->private_data; | |
931 | ||
932 | return ctx->ring_sock->sk; | |
933 | } | |
934 | #endif | |
935 | return NULL; | |
936 | } | |
937 | EXPORT_SYMBOL(io_uring_get_socket); | |
938 | ||
4dd2824d PB |
939 | static void io_get_req_task(struct io_kiocb *req) |
940 | { | |
941 | if (req->flags & REQ_F_TASK_PINNED) | |
942 | return; | |
943 | get_task_struct(req->task); | |
944 | req->flags |= REQ_F_TASK_PINNED; | |
945 | } | |
946 | ||
3ca405eb PB |
947 | static inline void io_clean_op(struct io_kiocb *req) |
948 | { | |
0e1b6fe3 | 949 | if (req->flags & (REQ_F_NEED_CLEANUP | REQ_F_BUFFER_SELECTED)) |
3ca405eb PB |
950 | __io_clean_op(req); |
951 | } | |
952 | ||
4dd2824d PB |
953 | /* not idempotent -- it doesn't clear REQ_F_TASK_PINNED */ |
954 | static void __io_put_req_task(struct io_kiocb *req) | |
955 | { | |
956 | if (req->flags & REQ_F_TASK_PINNED) | |
957 | put_task_struct(req->task); | |
958 | } | |
959 | ||
4349f30e | 960 | static void io_sq_thread_drop_mm(void) |
c40f6379 JA |
961 | { |
962 | struct mm_struct *mm = current->mm; | |
963 | ||
964 | if (mm) { | |
965 | kthread_unuse_mm(mm); | |
966 | mmput(mm); | |
967 | } | |
968 | } | |
969 | ||
970 | static int __io_sq_thread_acquire_mm(struct io_ring_ctx *ctx) | |
971 | { | |
972 | if (!current->mm) { | |
cbcf7214 PB |
973 | if (unlikely(!(ctx->flags & IORING_SETUP_SQPOLL) || |
974 | !mmget_not_zero(ctx->sqo_mm))) | |
c40f6379 JA |
975 | return -EFAULT; |
976 | kthread_use_mm(ctx->sqo_mm); | |
977 | } | |
978 | ||
979 | return 0; | |
980 | } | |
981 | ||
982 | static int io_sq_thread_acquire_mm(struct io_ring_ctx *ctx, | |
983 | struct io_kiocb *req) | |
984 | { | |
985 | if (!io_op_defs[req->opcode].needs_mm) | |
986 | return 0; | |
987 | return __io_sq_thread_acquire_mm(ctx); | |
988 | } | |
989 | ||
990 | static inline void req_set_fail_links(struct io_kiocb *req) | |
991 | { | |
992 | if ((req->flags & (REQ_F_LINK | REQ_F_HARDLINK)) == REQ_F_LINK) | |
993 | req->flags |= REQ_F_FAIL_LINK; | |
994 | } | |
4a38aed2 | 995 | |
7cdaf587 XW |
996 | /* |
997 | * Note: must call io_req_init_async() for the first time you | |
998 | * touch any members of io_wq_work. | |
999 | */ | |
1000 | static inline void io_req_init_async(struct io_kiocb *req) | |
1001 | { | |
1002 | if (req->flags & REQ_F_WORK_INITIALIZED) | |
1003 | return; | |
1004 | ||
1005 | memset(&req->work, 0, sizeof(req->work)); | |
1006 | req->flags |= REQ_F_WORK_INITIALIZED; | |
1007 | } | |
1008 | ||
0cdaf760 PB |
1009 | static inline bool io_async_submit(struct io_ring_ctx *ctx) |
1010 | { | |
1011 | return ctx->flags & IORING_SETUP_SQPOLL; | |
1012 | } | |
1013 | ||
2b188cc1 JA |
1014 | static void io_ring_ctx_ref_free(struct percpu_ref *ref) |
1015 | { | |
1016 | struct io_ring_ctx *ctx = container_of(ref, struct io_ring_ctx, refs); | |
1017 | ||
0f158b4c | 1018 | complete(&ctx->ref_comp); |
2b188cc1 JA |
1019 | } |
1020 | ||
8eb7e2d0 PB |
1021 | static inline bool io_is_timeout_noseq(struct io_kiocb *req) |
1022 | { | |
1023 | return !req->timeout.off; | |
1024 | } | |
1025 | ||
2b188cc1 JA |
1026 | static struct io_ring_ctx *io_ring_ctx_alloc(struct io_uring_params *p) |
1027 | { | |
1028 | struct io_ring_ctx *ctx; | |
78076bb6 | 1029 | int hash_bits; |
2b188cc1 JA |
1030 | |
1031 | ctx = kzalloc(sizeof(*ctx), GFP_KERNEL); | |
1032 | if (!ctx) | |
1033 | return NULL; | |
1034 | ||
0ddf92e8 JA |
1035 | ctx->fallback_req = kmem_cache_alloc(req_cachep, GFP_KERNEL); |
1036 | if (!ctx->fallback_req) | |
1037 | goto err; | |
1038 | ||
78076bb6 JA |
1039 | /* |
1040 | * Use 5 bits less than the max cq entries, that should give us around | |
1041 | * 32 entries per hash list if totally full and uniformly spread. | |
1042 | */ | |
1043 | hash_bits = ilog2(p->cq_entries); | |
1044 | hash_bits -= 5; | |
1045 | if (hash_bits <= 0) | |
1046 | hash_bits = 1; | |
1047 | ctx->cancel_hash_bits = hash_bits; | |
1048 | ctx->cancel_hash = kmalloc((1U << hash_bits) * sizeof(struct hlist_head), | |
1049 | GFP_KERNEL); | |
1050 | if (!ctx->cancel_hash) | |
1051 | goto err; | |
1052 | __hash_init(ctx->cancel_hash, 1U << hash_bits); | |
1053 | ||
21482896 | 1054 | if (percpu_ref_init(&ctx->refs, io_ring_ctx_ref_free, |
206aefde JA |
1055 | PERCPU_REF_ALLOW_REINIT, GFP_KERNEL)) |
1056 | goto err; | |
2b188cc1 JA |
1057 | |
1058 | ctx->flags = p->flags; | |
583863ed | 1059 | init_waitqueue_head(&ctx->sqo_wait); |
2b188cc1 | 1060 | init_waitqueue_head(&ctx->cq_wait); |
1d7bb1d5 | 1061 | INIT_LIST_HEAD(&ctx->cq_overflow_list); |
0f158b4c JA |
1062 | init_completion(&ctx->ref_comp); |
1063 | init_completion(&ctx->sq_thread_comp); | |
5a2e745d | 1064 | idr_init(&ctx->io_buffer_idr); |
071698e1 | 1065 | idr_init(&ctx->personality_idr); |
2b188cc1 JA |
1066 | mutex_init(&ctx->uring_lock); |
1067 | init_waitqueue_head(&ctx->wait); | |
1068 | spin_lock_init(&ctx->completion_lock); | |
540e32a0 | 1069 | INIT_LIST_HEAD(&ctx->iopoll_list); |
de0617e4 | 1070 | INIT_LIST_HEAD(&ctx->defer_list); |
5262f567 | 1071 | INIT_LIST_HEAD(&ctx->timeout_list); |
fcb323cc JA |
1072 | init_waitqueue_head(&ctx->inflight_wait); |
1073 | spin_lock_init(&ctx->inflight_lock); | |
1074 | INIT_LIST_HEAD(&ctx->inflight_list); | |
4a38aed2 JA |
1075 | INIT_DELAYED_WORK(&ctx->file_put_work, io_file_put_work); |
1076 | init_llist_head(&ctx->file_put_llist); | |
2b188cc1 | 1077 | return ctx; |
206aefde | 1078 | err: |
0ddf92e8 JA |
1079 | if (ctx->fallback_req) |
1080 | kmem_cache_free(req_cachep, ctx->fallback_req); | |
78076bb6 | 1081 | kfree(ctx->cancel_hash); |
206aefde JA |
1082 | kfree(ctx); |
1083 | return NULL; | |
2b188cc1 JA |
1084 | } |
1085 | ||
9cf7c104 | 1086 | static bool req_need_defer(struct io_kiocb *req, u32 seq) |
7adf4eaf | 1087 | { |
2bc9930e JA |
1088 | if (unlikely(req->flags & REQ_F_IO_DRAIN)) { |
1089 | struct io_ring_ctx *ctx = req->ctx; | |
a197f664 | 1090 | |
9cf7c104 | 1091 | return seq != ctx->cached_cq_tail |
31af27c7 | 1092 | + atomic_read(&ctx->cached_cq_overflow); |
2bc9930e | 1093 | } |
de0617e4 | 1094 | |
9d858b21 | 1095 | return false; |
de0617e4 JA |
1096 | } |
1097 | ||
de0617e4 | 1098 | static void __io_commit_cqring(struct io_ring_ctx *ctx) |
2b188cc1 | 1099 | { |
75b28aff | 1100 | struct io_rings *rings = ctx->rings; |
2b188cc1 | 1101 | |
07910158 PB |
1102 | /* order cqe stores with ring update */ |
1103 | smp_store_release(&rings->cq.tail, ctx->cached_cq_tail); | |
2b188cc1 | 1104 | |
07910158 PB |
1105 | if (wq_has_sleeper(&ctx->cq_wait)) { |
1106 | wake_up_interruptible(&ctx->cq_wait); | |
1107 | kill_fasync(&ctx->cq_fasync, SIGIO, POLL_IN); | |
2b188cc1 JA |
1108 | } |
1109 | } | |
1110 | ||
51a4cc11 JA |
1111 | /* |
1112 | * Returns true if we need to defer file table putting. This can only happen | |
1113 | * from the error path with REQ_F_COMP_LOCKED set. | |
1114 | */ | |
1115 | static bool io_req_clean_work(struct io_kiocb *req) | |
18d9be1a | 1116 | { |
7cdaf587 | 1117 | if (!(req->flags & REQ_F_WORK_INITIALIZED)) |
51a4cc11 JA |
1118 | return false; |
1119 | ||
1120 | req->flags &= ~REQ_F_WORK_INITIALIZED; | |
7cdaf587 | 1121 | |
cccf0ee8 JA |
1122 | if (req->work.mm) { |
1123 | mmdrop(req->work.mm); | |
1124 | req->work.mm = NULL; | |
1125 | } | |
1126 | if (req->work.creds) { | |
1127 | put_cred(req->work.creds); | |
1128 | req->work.creds = NULL; | |
1129 | } | |
ff002b30 JA |
1130 | if (req->work.fs) { |
1131 | struct fs_struct *fs = req->work.fs; | |
1132 | ||
51a4cc11 JA |
1133 | if (req->flags & REQ_F_COMP_LOCKED) |
1134 | return true; | |
1135 | ||
ff002b30 JA |
1136 | spin_lock(&req->work.fs->lock); |
1137 | if (--fs->users) | |
1138 | fs = NULL; | |
1139 | spin_unlock(&req->work.fs->lock); | |
1140 | if (fs) | |
1141 | free_fs_struct(fs); | |
b65e0dd6 | 1142 | req->work.fs = NULL; |
ff002b30 | 1143 | } |
51a4cc11 JA |
1144 | |
1145 | return false; | |
561fb04a JA |
1146 | } |
1147 | ||
cbdcb435 | 1148 | static void io_prep_async_work(struct io_kiocb *req) |
18d9be1a | 1149 | { |
d3656344 | 1150 | const struct io_op_def *def = &io_op_defs[req->opcode]; |
54a91f3b | 1151 | |
16d59803 PB |
1152 | io_req_init_async(req); |
1153 | ||
d3656344 JA |
1154 | if (req->flags & REQ_F_ISREG) { |
1155 | if (def->hash_reg_file) | |
8766dd51 | 1156 | io_wq_hash_work(&req->work, file_inode(req->file)); |
d3656344 JA |
1157 | } else { |
1158 | if (def->unbound_nonreg_file) | |
3529d8c2 | 1159 | req->work.flags |= IO_WQ_WORK_UNBOUND; |
54a91f3b | 1160 | } |
dca9cf8b PB |
1161 | if (!req->work.mm && def->needs_mm) { |
1162 | mmgrab(current->mm); | |
1163 | req->work.mm = current->mm; | |
1164 | } | |
1165 | if (!req->work.creds) | |
1166 | req->work.creds = get_current_cred(); | |
1167 | if (!req->work.fs && def->needs_fs) { | |
1168 | spin_lock(¤t->fs->lock); | |
1169 | if (!current->fs->in_exec) { | |
1170 | req->work.fs = current->fs; | |
1171 | req->work.fs->users++; | |
1172 | } else { | |
1173 | req->work.flags |= IO_WQ_WORK_CANCEL; | |
1174 | } | |
1175 | spin_unlock(¤t->fs->lock); | |
1176 | } | |
57f1a649 PB |
1177 | if (def->needs_fsize) |
1178 | req->work.fsize = rlimit(RLIMIT_FSIZE); | |
1179 | else | |
1180 | req->work.fsize = RLIM_INFINITY; | |
561fb04a | 1181 | } |
cccf0ee8 | 1182 | |
cbdcb435 | 1183 | static void io_prep_async_link(struct io_kiocb *req) |
561fb04a | 1184 | { |
cbdcb435 | 1185 | struct io_kiocb *cur; |
54a91f3b | 1186 | |
cbdcb435 PB |
1187 | io_prep_async_work(req); |
1188 | if (req->flags & REQ_F_LINK_HEAD) | |
1189 | list_for_each_entry(cur, &req->link_list, link_list) | |
1190 | io_prep_async_work(cur); | |
561fb04a JA |
1191 | } |
1192 | ||
7271ef3a | 1193 | static struct io_kiocb *__io_queue_async_work(struct io_kiocb *req) |
561fb04a | 1194 | { |
a197f664 | 1195 | struct io_ring_ctx *ctx = req->ctx; |
cbdcb435 | 1196 | struct io_kiocb *link = io_prep_linked_timeout(req); |
561fb04a | 1197 | |
8766dd51 PB |
1198 | trace_io_uring_queue_async_work(ctx, io_wq_is_hashed(&req->work), req, |
1199 | &req->work, req->flags); | |
1200 | io_wq_enqueue(ctx->io_wq, &req->work); | |
7271ef3a | 1201 | return link; |
18d9be1a JA |
1202 | } |
1203 | ||
cbdcb435 PB |
1204 | static void io_queue_async_work(struct io_kiocb *req) |
1205 | { | |
7271ef3a JA |
1206 | struct io_kiocb *link; |
1207 | ||
cbdcb435 PB |
1208 | /* init ->work of the whole link before punting */ |
1209 | io_prep_async_link(req); | |
7271ef3a JA |
1210 | link = __io_queue_async_work(req); |
1211 | ||
1212 | if (link) | |
1213 | io_queue_linked_timeout(link); | |
cbdcb435 PB |
1214 | } |
1215 | ||
5262f567 JA |
1216 | static void io_kill_timeout(struct io_kiocb *req) |
1217 | { | |
1218 | int ret; | |
1219 | ||
2d28390a | 1220 | ret = hrtimer_try_to_cancel(&req->io->timeout.timer); |
5262f567 | 1221 | if (ret != -1) { |
01cec8c1 PB |
1222 | atomic_set(&req->ctx->cq_timeouts, |
1223 | atomic_read(&req->ctx->cq_timeouts) + 1); | |
135fcde8 | 1224 | list_del_init(&req->timeout.list); |
f0e20b89 | 1225 | req->flags |= REQ_F_COMP_LOCKED; |
78e19bbe | 1226 | io_cqring_fill_event(req, 0); |
ec9c02ad | 1227 | io_put_req(req); |
5262f567 JA |
1228 | } |
1229 | } | |
1230 | ||
1231 | static void io_kill_timeouts(struct io_ring_ctx *ctx) | |
1232 | { | |
1233 | struct io_kiocb *req, *tmp; | |
1234 | ||
1235 | spin_lock_irq(&ctx->completion_lock); | |
135fcde8 | 1236 | list_for_each_entry_safe(req, tmp, &ctx->timeout_list, timeout.list) |
5262f567 JA |
1237 | io_kill_timeout(req); |
1238 | spin_unlock_irq(&ctx->completion_lock); | |
1239 | } | |
1240 | ||
04518945 | 1241 | static void __io_queue_deferred(struct io_ring_ctx *ctx) |
de0617e4 | 1242 | { |
04518945 | 1243 | do { |
27dc8338 PB |
1244 | struct io_defer_entry *de = list_first_entry(&ctx->defer_list, |
1245 | struct io_defer_entry, list); | |
7271ef3a | 1246 | struct io_kiocb *link; |
de0617e4 | 1247 | |
9cf7c104 | 1248 | if (req_need_defer(de->req, de->seq)) |
04518945 | 1249 | break; |
27dc8338 | 1250 | list_del_init(&de->list); |
cbdcb435 | 1251 | /* punt-init is done before queueing for defer */ |
7271ef3a JA |
1252 | link = __io_queue_async_work(de->req); |
1253 | if (link) { | |
1254 | __io_queue_linked_timeout(link); | |
1255 | /* drop submission reference */ | |
1256 | link->flags |= REQ_F_COMP_LOCKED; | |
1257 | io_put_req(link); | |
1258 | } | |
27dc8338 | 1259 | kfree(de); |
04518945 PB |
1260 | } while (!list_empty(&ctx->defer_list)); |
1261 | } | |
1262 | ||
360428f8 | 1263 | static void io_flush_timeouts(struct io_ring_ctx *ctx) |
de0617e4 | 1264 | { |
360428f8 PB |
1265 | while (!list_empty(&ctx->timeout_list)) { |
1266 | struct io_kiocb *req = list_first_entry(&ctx->timeout_list, | |
135fcde8 | 1267 | struct io_kiocb, timeout.list); |
de0617e4 | 1268 | |
8eb7e2d0 | 1269 | if (io_is_timeout_noseq(req)) |
360428f8 | 1270 | break; |
bfe68a22 PB |
1271 | if (req->timeout.target_seq != ctx->cached_cq_tail |
1272 | - atomic_read(&ctx->cq_timeouts)) | |
360428f8 | 1273 | break; |
bfe68a22 | 1274 | |
135fcde8 | 1275 | list_del_init(&req->timeout.list); |
5262f567 | 1276 | io_kill_timeout(req); |
360428f8 PB |
1277 | } |
1278 | } | |
5262f567 | 1279 | |
360428f8 PB |
1280 | static void io_commit_cqring(struct io_ring_ctx *ctx) |
1281 | { | |
1282 | io_flush_timeouts(ctx); | |
de0617e4 JA |
1283 | __io_commit_cqring(ctx); |
1284 | ||
04518945 PB |
1285 | if (unlikely(!list_empty(&ctx->defer_list))) |
1286 | __io_queue_deferred(ctx); | |
de0617e4 JA |
1287 | } |
1288 | ||
2b188cc1 JA |
1289 | static struct io_uring_cqe *io_get_cqring(struct io_ring_ctx *ctx) |
1290 | { | |
75b28aff | 1291 | struct io_rings *rings = ctx->rings; |
2b188cc1 JA |
1292 | unsigned tail; |
1293 | ||
1294 | tail = ctx->cached_cq_tail; | |
115e12e5 SB |
1295 | /* |
1296 | * writes to the cq entry need to come after reading head; the | |
1297 | * control dependency is enough as we're using WRITE_ONCE to | |
1298 | * fill the cq entry | |
1299 | */ | |
75b28aff | 1300 | if (tail - READ_ONCE(rings->cq.head) == rings->cq_ring_entries) |
2b188cc1 JA |
1301 | return NULL; |
1302 | ||
1303 | ctx->cached_cq_tail++; | |
75b28aff | 1304 | return &rings->cqes[tail & ctx->cq_mask]; |
2b188cc1 JA |
1305 | } |
1306 | ||
f2842ab5 JA |
1307 | static inline bool io_should_trigger_evfd(struct io_ring_ctx *ctx) |
1308 | { | |
f0b493e6 JA |
1309 | if (!ctx->cq_ev_fd) |
1310 | return false; | |
7e55a19c SG |
1311 | if (READ_ONCE(ctx->rings->cq_flags) & IORING_CQ_EVENTFD_DISABLED) |
1312 | return false; | |
f2842ab5 JA |
1313 | if (!ctx->eventfd_async) |
1314 | return true; | |
b41e9852 | 1315 | return io_wq_current_is_worker(); |
f2842ab5 JA |
1316 | } |
1317 | ||
b41e9852 | 1318 | static void io_cqring_ev_posted(struct io_ring_ctx *ctx) |
1d7bb1d5 JA |
1319 | { |
1320 | if (waitqueue_active(&ctx->wait)) | |
1321 | wake_up(&ctx->wait); | |
1322 | if (waitqueue_active(&ctx->sqo_wait)) | |
1323 | wake_up(&ctx->sqo_wait); | |
b41e9852 | 1324 | if (io_should_trigger_evfd(ctx)) |
1d7bb1d5 JA |
1325 | eventfd_signal(ctx->cq_ev_fd, 1); |
1326 | } | |
1327 | ||
46930143 PB |
1328 | static void io_cqring_mark_overflow(struct io_ring_ctx *ctx) |
1329 | { | |
1330 | if (list_empty(&ctx->cq_overflow_list)) { | |
1331 | clear_bit(0, &ctx->sq_check_overflow); | |
1332 | clear_bit(0, &ctx->cq_check_overflow); | |
1333 | ctx->rings->sq_flags &= ~IORING_SQ_CQ_OVERFLOW; | |
1334 | } | |
1335 | } | |
1336 | ||
c4a2ed72 JA |
1337 | /* Returns true if there are no backlogged entries after the flush */ |
1338 | static bool io_cqring_overflow_flush(struct io_ring_ctx *ctx, bool force) | |
1d7bb1d5 JA |
1339 | { |
1340 | struct io_rings *rings = ctx->rings; | |
1341 | struct io_uring_cqe *cqe; | |
1342 | struct io_kiocb *req; | |
1343 | unsigned long flags; | |
1344 | LIST_HEAD(list); | |
1345 | ||
1346 | if (!force) { | |
1347 | if (list_empty_careful(&ctx->cq_overflow_list)) | |
c4a2ed72 | 1348 | return true; |
1d7bb1d5 JA |
1349 | if ((ctx->cached_cq_tail - READ_ONCE(rings->cq.head) == |
1350 | rings->cq_ring_entries)) | |
c4a2ed72 | 1351 | return false; |
1d7bb1d5 JA |
1352 | } |
1353 | ||
1354 | spin_lock_irqsave(&ctx->completion_lock, flags); | |
1355 | ||
1356 | /* if force is set, the ring is going away. always drop after that */ | |
1357 | if (force) | |
69b3e546 | 1358 | ctx->cq_overflow_flushed = 1; |
1d7bb1d5 | 1359 | |
c4a2ed72 | 1360 | cqe = NULL; |
1d7bb1d5 JA |
1361 | while (!list_empty(&ctx->cq_overflow_list)) { |
1362 | cqe = io_get_cqring(ctx); | |
1363 | if (!cqe && !force) | |
1364 | break; | |
1365 | ||
1366 | req = list_first_entry(&ctx->cq_overflow_list, struct io_kiocb, | |
40d8ddd4 PB |
1367 | compl.list); |
1368 | list_move(&req->compl.list, &list); | |
2ca10259 | 1369 | req->flags &= ~REQ_F_OVERFLOW; |
1d7bb1d5 JA |
1370 | if (cqe) { |
1371 | WRITE_ONCE(cqe->user_data, req->user_data); | |
1372 | WRITE_ONCE(cqe->res, req->result); | |
0f7e466b | 1373 | WRITE_ONCE(cqe->flags, req->compl.cflags); |
1d7bb1d5 JA |
1374 | } else { |
1375 | WRITE_ONCE(ctx->rings->cq_overflow, | |
1376 | atomic_inc_return(&ctx->cached_cq_overflow)); | |
1377 | } | |
1378 | } | |
1379 | ||
1380 | io_commit_cqring(ctx); | |
46930143 PB |
1381 | io_cqring_mark_overflow(ctx); |
1382 | ||
1d7bb1d5 JA |
1383 | spin_unlock_irqrestore(&ctx->completion_lock, flags); |
1384 | io_cqring_ev_posted(ctx); | |
1385 | ||
1386 | while (!list_empty(&list)) { | |
40d8ddd4 PB |
1387 | req = list_first_entry(&list, struct io_kiocb, compl.list); |
1388 | list_del(&req->compl.list); | |
ec9c02ad | 1389 | io_put_req(req); |
1d7bb1d5 | 1390 | } |
c4a2ed72 JA |
1391 | |
1392 | return cqe != NULL; | |
1d7bb1d5 JA |
1393 | } |
1394 | ||
bcda7baa | 1395 | static void __io_cqring_fill_event(struct io_kiocb *req, long res, long cflags) |
2b188cc1 | 1396 | { |
78e19bbe | 1397 | struct io_ring_ctx *ctx = req->ctx; |
2b188cc1 JA |
1398 | struct io_uring_cqe *cqe; |
1399 | ||
78e19bbe | 1400 | trace_io_uring_complete(ctx, req->user_data, res); |
51c3ff62 | 1401 | |
2b188cc1 JA |
1402 | /* |
1403 | * If we can't get a cq entry, userspace overflowed the | |
1404 | * submission (by quite a lot). Increment the overflow count in | |
1405 | * the ring. | |
1406 | */ | |
1407 | cqe = io_get_cqring(ctx); | |
1d7bb1d5 | 1408 | if (likely(cqe)) { |
78e19bbe | 1409 | WRITE_ONCE(cqe->user_data, req->user_data); |
2b188cc1 | 1410 | WRITE_ONCE(cqe->res, res); |
bcda7baa | 1411 | WRITE_ONCE(cqe->flags, cflags); |
1d7bb1d5 | 1412 | } else if (ctx->cq_overflow_flushed) { |
498ccd9e JA |
1413 | WRITE_ONCE(ctx->rings->cq_overflow, |
1414 | atomic_inc_return(&ctx->cached_cq_overflow)); | |
1d7bb1d5 | 1415 | } else { |
ad3eb2c8 JA |
1416 | if (list_empty(&ctx->cq_overflow_list)) { |
1417 | set_bit(0, &ctx->sq_check_overflow); | |
1418 | set_bit(0, &ctx->cq_check_overflow); | |
6d5f9049 | 1419 | ctx->rings->sq_flags |= IORING_SQ_CQ_OVERFLOW; |
ad3eb2c8 | 1420 | } |
40d8ddd4 | 1421 | io_clean_op(req); |
2ca10259 | 1422 | req->flags |= REQ_F_OVERFLOW; |
1d7bb1d5 | 1423 | req->result = res; |
0f7e466b | 1424 | req->compl.cflags = cflags; |
40d8ddd4 PB |
1425 | refcount_inc(&req->refs); |
1426 | list_add_tail(&req->compl.list, &ctx->cq_overflow_list); | |
2b188cc1 JA |
1427 | } |
1428 | } | |
1429 | ||
bcda7baa JA |
1430 | static void io_cqring_fill_event(struct io_kiocb *req, long res) |
1431 | { | |
1432 | __io_cqring_fill_event(req, res, 0); | |
1433 | } | |
1434 | ||
e1e16097 | 1435 | static void io_cqring_add_event(struct io_kiocb *req, long res, long cflags) |
2b188cc1 | 1436 | { |
78e19bbe | 1437 | struct io_ring_ctx *ctx = req->ctx; |
2b188cc1 JA |
1438 | unsigned long flags; |
1439 | ||
1440 | spin_lock_irqsave(&ctx->completion_lock, flags); | |
bcda7baa | 1441 | __io_cqring_fill_event(req, res, cflags); |
2b188cc1 JA |
1442 | io_commit_cqring(ctx); |
1443 | spin_unlock_irqrestore(&ctx->completion_lock, flags); | |
1444 | ||
8c838788 | 1445 | io_cqring_ev_posted(ctx); |
2b188cc1 JA |
1446 | } |
1447 | ||
229a7b63 | 1448 | static void io_submit_flush_completions(struct io_comp_state *cs) |
bcda7baa | 1449 | { |
229a7b63 JA |
1450 | struct io_ring_ctx *ctx = cs->ctx; |
1451 | ||
1452 | spin_lock_irq(&ctx->completion_lock); | |
1453 | while (!list_empty(&cs->list)) { | |
1454 | struct io_kiocb *req; | |
1455 | ||
3ca405eb PB |
1456 | req = list_first_entry(&cs->list, struct io_kiocb, compl.list); |
1457 | list_del(&req->compl.list); | |
0f7e466b | 1458 | __io_cqring_fill_event(req, req->result, req->compl.cflags); |
229a7b63 JA |
1459 | if (!(req->flags & REQ_F_LINK_HEAD)) { |
1460 | req->flags |= REQ_F_COMP_LOCKED; | |
1461 | io_put_req(req); | |
1462 | } else { | |
1463 | spin_unlock_irq(&ctx->completion_lock); | |
1464 | io_put_req(req); | |
1465 | spin_lock_irq(&ctx->completion_lock); | |
1466 | } | |
1467 | } | |
1468 | io_commit_cqring(ctx); | |
1469 | spin_unlock_irq(&ctx->completion_lock); | |
1470 | ||
1471 | io_cqring_ev_posted(ctx); | |
1472 | cs->nr = 0; | |
1473 | } | |
1474 | ||
1475 | static void __io_req_complete(struct io_kiocb *req, long res, unsigned cflags, | |
1476 | struct io_comp_state *cs) | |
1477 | { | |
1478 | if (!cs) { | |
1479 | io_cqring_add_event(req, res, cflags); | |
1480 | io_put_req(req); | |
1481 | } else { | |
3ca405eb | 1482 | io_clean_op(req); |
229a7b63 | 1483 | req->result = res; |
0f7e466b | 1484 | req->compl.cflags = cflags; |
3ca405eb | 1485 | list_add_tail(&req->compl.list, &cs->list); |
229a7b63 JA |
1486 | if (++cs->nr >= 32) |
1487 | io_submit_flush_completions(cs); | |
1488 | } | |
e1e16097 JA |
1489 | } |
1490 | ||
1491 | static void io_req_complete(struct io_kiocb *req, long res) | |
bcda7baa | 1492 | { |
229a7b63 | 1493 | __io_req_complete(req, res, 0, NULL); |
bcda7baa JA |
1494 | } |
1495 | ||
0ddf92e8 JA |
1496 | static inline bool io_is_fallback_req(struct io_kiocb *req) |
1497 | { | |
1498 | return req == (struct io_kiocb *) | |
1499 | ((unsigned long) req->ctx->fallback_req & ~1UL); | |
1500 | } | |
1501 | ||
1502 | static struct io_kiocb *io_get_fallback_req(struct io_ring_ctx *ctx) | |
1503 | { | |
1504 | struct io_kiocb *req; | |
1505 | ||
1506 | req = ctx->fallback_req; | |
dd461af6 | 1507 | if (!test_and_set_bit_lock(0, (unsigned long *) &ctx->fallback_req)) |
0ddf92e8 JA |
1508 | return req; |
1509 | ||
1510 | return NULL; | |
1511 | } | |
1512 | ||
0553b8bd PB |
1513 | static struct io_kiocb *io_alloc_req(struct io_ring_ctx *ctx, |
1514 | struct io_submit_state *state) | |
2b188cc1 | 1515 | { |
fd6fab2c | 1516 | gfp_t gfp = GFP_KERNEL | __GFP_NOWARN; |
2b188cc1 JA |
1517 | struct io_kiocb *req; |
1518 | ||
f6b6c7d6 | 1519 | if (!state->free_reqs) { |
2579f913 JA |
1520 | size_t sz; |
1521 | int ret; | |
1522 | ||
1523 | sz = min_t(size_t, state->ios_left, ARRAY_SIZE(state->reqs)); | |
fd6fab2c JA |
1524 | ret = kmem_cache_alloc_bulk(req_cachep, gfp, sz, state->reqs); |
1525 | ||
1526 | /* | |
1527 | * Bulk alloc is all-or-nothing. If we fail to get a batch, | |
1528 | * retry single alloc to be on the safe side. | |
1529 | */ | |
1530 | if (unlikely(ret <= 0)) { | |
1531 | state->reqs[0] = kmem_cache_alloc(req_cachep, gfp); | |
1532 | if (!state->reqs[0]) | |
0ddf92e8 | 1533 | goto fallback; |
fd6fab2c JA |
1534 | ret = 1; |
1535 | } | |
2579f913 | 1536 | state->free_reqs = ret - 1; |
6c8a3134 | 1537 | req = state->reqs[ret - 1]; |
2579f913 | 1538 | } else { |
2579f913 | 1539 | state->free_reqs--; |
6c8a3134 | 1540 | req = state->reqs[state->free_reqs]; |
2b188cc1 JA |
1541 | } |
1542 | ||
2579f913 | 1543 | return req; |
0ddf92e8 | 1544 | fallback: |
0553b8bd | 1545 | return io_get_fallback_req(ctx); |
2b188cc1 JA |
1546 | } |
1547 | ||
8da11c19 PB |
1548 | static inline void io_put_file(struct io_kiocb *req, struct file *file, |
1549 | bool fixed) | |
1550 | { | |
1551 | if (fixed) | |
05589553 | 1552 | percpu_ref_put(req->fixed_file_refs); |
8da11c19 PB |
1553 | else |
1554 | fput(file); | |
1555 | } | |
1556 | ||
51a4cc11 | 1557 | static bool io_dismantle_req(struct io_kiocb *req) |
2b188cc1 | 1558 | { |
3ca405eb | 1559 | io_clean_op(req); |
929a3af9 | 1560 | |
5acbbc8e JA |
1561 | if (req->io) |
1562 | kfree(req->io); | |
8da11c19 PB |
1563 | if (req->file) |
1564 | io_put_file(req, req->file, (req->flags & REQ_F_FIXED_FILE)); | |
fcb323cc | 1565 | |
fcb323cc | 1566 | if (req->flags & REQ_F_INFLIGHT) { |
c6ca97b3 | 1567 | struct io_ring_ctx *ctx = req->ctx; |
fcb323cc JA |
1568 | unsigned long flags; |
1569 | ||
1570 | spin_lock_irqsave(&ctx->inflight_lock, flags); | |
1571 | list_del(&req->inflight_entry); | |
1572 | if (waitqueue_active(&ctx->inflight_wait)) | |
1573 | wake_up(&ctx->inflight_wait); | |
1574 | spin_unlock_irqrestore(&ctx->inflight_lock, flags); | |
1575 | } | |
51a4cc11 JA |
1576 | |
1577 | return io_req_clean_work(req); | |
e65ef56d JA |
1578 | } |
1579 | ||
51a4cc11 | 1580 | static void __io_free_req_finish(struct io_kiocb *req) |
c6ca97b3 | 1581 | { |
51a4cc11 | 1582 | struct io_ring_ctx *ctx = req->ctx; |
c6ca97b3 | 1583 | |
5af1d13e | 1584 | __io_put_req_task(req); |
b1e50e54 PB |
1585 | if (likely(!io_is_fallback_req(req))) |
1586 | kmem_cache_free(req_cachep, req); | |
1587 | else | |
ecfc5177 PB |
1588 | clear_bit_unlock(0, (unsigned long *) &ctx->fallback_req); |
1589 | percpu_ref_put(&ctx->refs); | |
e65ef56d JA |
1590 | } |
1591 | ||
51a4cc11 JA |
1592 | static void io_req_task_file_table_put(struct callback_head *cb) |
1593 | { | |
1594 | struct io_kiocb *req = container_of(cb, struct io_kiocb, task_work); | |
1595 | struct fs_struct *fs = req->work.fs; | |
1596 | ||
1597 | spin_lock(&req->work.fs->lock); | |
1598 | if (--fs->users) | |
1599 | fs = NULL; | |
1600 | spin_unlock(&req->work.fs->lock); | |
1601 | if (fs) | |
1602 | free_fs_struct(fs); | |
1603 | req->work.fs = NULL; | |
1604 | __io_free_req_finish(req); | |
1605 | } | |
1606 | ||
1607 | static void __io_free_req(struct io_kiocb *req) | |
1608 | { | |
1609 | if (!io_dismantle_req(req)) { | |
1610 | __io_free_req_finish(req); | |
1611 | } else { | |
1612 | int ret; | |
1613 | ||
1614 | init_task_work(&req->task_work, io_req_task_file_table_put); | |
1615 | ret = task_work_add(req->task, &req->task_work, TWA_RESUME); | |
1616 | if (unlikely(ret)) { | |
1617 | struct task_struct *tsk; | |
1618 | ||
1619 | tsk = io_wq_get_task(req->ctx->io_wq); | |
1620 | task_work_add(tsk, &req->task_work, 0); | |
1621 | } | |
1622 | } | |
1623 | } | |
1624 | ||
a197f664 | 1625 | static bool io_link_cancel_timeout(struct io_kiocb *req) |
2665abfd | 1626 | { |
a197f664 | 1627 | struct io_ring_ctx *ctx = req->ctx; |
2665abfd JA |
1628 | int ret; |
1629 | ||
2d28390a | 1630 | ret = hrtimer_try_to_cancel(&req->io->timeout.timer); |
2665abfd | 1631 | if (ret != -1) { |
78e19bbe | 1632 | io_cqring_fill_event(req, -ECANCELED); |
2665abfd | 1633 | io_commit_cqring(ctx); |
dea3b49c | 1634 | req->flags &= ~REQ_F_LINK_HEAD; |
ec9c02ad | 1635 | io_put_req(req); |
2665abfd JA |
1636 | return true; |
1637 | } | |
1638 | ||
1639 | return false; | |
e65ef56d JA |
1640 | } |
1641 | ||
ab0b6451 | 1642 | static bool __io_kill_linked_timeout(struct io_kiocb *req) |
9e645e11 | 1643 | { |
7c86ffee | 1644 | struct io_kiocb *link; |
ab0b6451 | 1645 | bool wake_ev; |
7c86ffee PB |
1646 | |
1647 | if (list_empty(&req->link_list)) | |
ab0b6451 | 1648 | return false; |
7c86ffee PB |
1649 | link = list_first_entry(&req->link_list, struct io_kiocb, link_list); |
1650 | if (link->opcode != IORING_OP_LINK_TIMEOUT) | |
ab0b6451 | 1651 | return false; |
7c86ffee PB |
1652 | |
1653 | list_del_init(&link->link_list); | |
9b7adba9 | 1654 | link->flags |= REQ_F_COMP_LOCKED; |
7c86ffee PB |
1655 | wake_ev = io_link_cancel_timeout(link); |
1656 | req->flags &= ~REQ_F_LINK_TIMEOUT; | |
ab0b6451 JA |
1657 | return wake_ev; |
1658 | } | |
1659 | ||
1660 | static void io_kill_linked_timeout(struct io_kiocb *req) | |
9e645e11 | 1661 | { |
2665abfd | 1662 | struct io_ring_ctx *ctx = req->ctx; |
ab0b6451 | 1663 | bool wake_ev; |
9e645e11 | 1664 | |
ab0b6451 JA |
1665 | if (!(req->flags & REQ_F_COMP_LOCKED)) { |
1666 | unsigned long flags; | |
1667 | ||
1668 | spin_lock_irqsave(&ctx->completion_lock, flags); | |
1669 | wake_ev = __io_kill_linked_timeout(req); | |
7c86ffee | 1670 | spin_unlock_irqrestore(&ctx->completion_lock, flags); |
ab0b6451 JA |
1671 | } else { |
1672 | wake_ev = __io_kill_linked_timeout(req); | |
1673 | } | |
1674 | ||
7c86ffee PB |
1675 | if (wake_ev) |
1676 | io_cqring_ev_posted(ctx); | |
1677 | } | |
1678 | ||
9b5f7bd9 | 1679 | static struct io_kiocb *io_req_link_next(struct io_kiocb *req) |
7c86ffee PB |
1680 | { |
1681 | struct io_kiocb *nxt; | |
4d7dd462 | 1682 | |
9e645e11 JA |
1683 | /* |
1684 | * The list should never be empty when we are called here. But could | |
1685 | * potentially happen if the chain is messed up, check to be on the | |
1686 | * safe side. | |
1687 | */ | |
7c86ffee | 1688 | if (unlikely(list_empty(&req->link_list))) |
9b5f7bd9 | 1689 | return NULL; |
2665abfd | 1690 | |
7c86ffee PB |
1691 | nxt = list_first_entry(&req->link_list, struct io_kiocb, link_list); |
1692 | list_del_init(&req->link_list); | |
1693 | if (!list_empty(&nxt->link_list)) | |
1694 | nxt->flags |= REQ_F_LINK_HEAD; | |
9b5f7bd9 | 1695 | return nxt; |
9e645e11 JA |
1696 | } |
1697 | ||
1698 | /* | |
dea3b49c | 1699 | * Called if REQ_F_LINK_HEAD is set, and we fail the head request |
9e645e11 | 1700 | */ |
7c86ffee | 1701 | static void __io_fail_links(struct io_kiocb *req) |
9e645e11 | 1702 | { |
2665abfd | 1703 | struct io_ring_ctx *ctx = req->ctx; |
9e645e11 JA |
1704 | |
1705 | while (!list_empty(&req->link_list)) { | |
4493233e PB |
1706 | struct io_kiocb *link = list_first_entry(&req->link_list, |
1707 | struct io_kiocb, link_list); | |
9e645e11 | 1708 | |
4493233e | 1709 | list_del_init(&link->link_list); |
c826bd7a | 1710 | trace_io_uring_fail_link(req, link); |
2665abfd | 1711 | |
7c86ffee | 1712 | io_cqring_fill_event(link, -ECANCELED); |
9b7adba9 | 1713 | link->flags |= REQ_F_COMP_LOCKED; |
7c86ffee | 1714 | __io_double_put_req(link); |
5d960724 | 1715 | req->flags &= ~REQ_F_LINK_TIMEOUT; |
9e645e11 | 1716 | } |
2665abfd JA |
1717 | |
1718 | io_commit_cqring(ctx); | |
2665abfd | 1719 | io_cqring_ev_posted(ctx); |
9e645e11 JA |
1720 | } |
1721 | ||
7c86ffee | 1722 | static void io_fail_links(struct io_kiocb *req) |
9e645e11 | 1723 | { |
7c86ffee | 1724 | struct io_ring_ctx *ctx = req->ctx; |
2665abfd | 1725 | |
7c86ffee | 1726 | if (!(req->flags & REQ_F_COMP_LOCKED)) { |
2665abfd JA |
1727 | unsigned long flags; |
1728 | ||
2665abfd | 1729 | spin_lock_irqsave(&ctx->completion_lock, flags); |
7c86ffee | 1730 | __io_fail_links(req); |
2665abfd JA |
1731 | spin_unlock_irqrestore(&ctx->completion_lock, flags); |
1732 | } else { | |
7c86ffee | 1733 | __io_fail_links(req); |
9e645e11 JA |
1734 | } |
1735 | ||
2665abfd | 1736 | io_cqring_ev_posted(ctx); |
9e645e11 JA |
1737 | } |
1738 | ||
3fa5e0f3 | 1739 | static struct io_kiocb *__io_req_find_next(struct io_kiocb *req) |
c69f8dbe | 1740 | { |
9b0d911a | 1741 | req->flags &= ~REQ_F_LINK_HEAD; |
7c86ffee PB |
1742 | if (req->flags & REQ_F_LINK_TIMEOUT) |
1743 | io_kill_linked_timeout(req); | |
944e58bf | 1744 | |
9e645e11 JA |
1745 | /* |
1746 | * If LINK is set, we have dependent requests in this chain. If we | |
1747 | * didn't fail this request, queue the first one up, moving any other | |
1748 | * dependencies to the next request. In case of failure, fail the rest | |
1749 | * of the chain. | |
1750 | */ | |
9b5f7bd9 PB |
1751 | if (likely(!(req->flags & REQ_F_FAIL_LINK))) |
1752 | return io_req_link_next(req); | |
1753 | io_fail_links(req); | |
1754 | return NULL; | |
4d7dd462 | 1755 | } |
9e645e11 | 1756 | |
3fa5e0f3 PB |
1757 | static struct io_kiocb *io_req_find_next(struct io_kiocb *req) |
1758 | { | |
1759 | if (likely(!(req->flags & REQ_F_LINK_HEAD))) | |
1760 | return NULL; | |
1761 | return __io_req_find_next(req); | |
1762 | } | |
1763 | ||
c2c4c83c JA |
1764 | static int io_req_task_work_add(struct io_kiocb *req, struct callback_head *cb) |
1765 | { | |
1766 | struct task_struct *tsk = req->task; | |
1767 | struct io_ring_ctx *ctx = req->ctx; | |
0ba9c9ed | 1768 | int ret, notify; |
c2c4c83c JA |
1769 | |
1770 | /* | |
0ba9c9ed JA |
1771 | * SQPOLL kernel thread doesn't need notification, just a wakeup. For |
1772 | * all other cases, use TWA_SIGNAL unconditionally to ensure we're | |
1773 | * processing task_work. There's no reliable way to tell if TWA_RESUME | |
1774 | * will do the job. | |
c2c4c83c | 1775 | */ |
0ba9c9ed JA |
1776 | notify = 0; |
1777 | if (!(ctx->flags & IORING_SETUP_SQPOLL)) | |
c2c4c83c JA |
1778 | notify = TWA_SIGNAL; |
1779 | ||
1780 | ret = task_work_add(tsk, cb, notify); | |
1781 | if (!ret) | |
1782 | wake_up_process(tsk); | |
0ba9c9ed | 1783 | |
c2c4c83c JA |
1784 | return ret; |
1785 | } | |
1786 | ||
c40f6379 JA |
1787 | static void __io_req_task_cancel(struct io_kiocb *req, int error) |
1788 | { | |
1789 | struct io_ring_ctx *ctx = req->ctx; | |
1790 | ||
1791 | spin_lock_irq(&ctx->completion_lock); | |
1792 | io_cqring_fill_event(req, error); | |
1793 | io_commit_cqring(ctx); | |
1794 | spin_unlock_irq(&ctx->completion_lock); | |
1795 | ||
1796 | io_cqring_ev_posted(ctx); | |
1797 | req_set_fail_links(req); | |
1798 | io_double_put_req(req); | |
1799 | } | |
1800 | ||
1801 | static void io_req_task_cancel(struct callback_head *cb) | |
1802 | { | |
1803 | struct io_kiocb *req = container_of(cb, struct io_kiocb, task_work); | |
1804 | ||
1805 | __io_req_task_cancel(req, -ECANCELED); | |
1806 | } | |
1807 | ||
1808 | static void __io_req_task_submit(struct io_kiocb *req) | |
1809 | { | |
1810 | struct io_ring_ctx *ctx = req->ctx; | |
1811 | ||
c40f6379 JA |
1812 | if (!__io_sq_thread_acquire_mm(ctx)) { |
1813 | mutex_lock(&ctx->uring_lock); | |
1814 | __io_queue_sqe(req, NULL, NULL); | |
1815 | mutex_unlock(&ctx->uring_lock); | |
1816 | } else { | |
1817 | __io_req_task_cancel(req, -EFAULT); | |
1818 | } | |
1819 | } | |
1820 | ||
1821 | static void io_req_task_submit(struct callback_head *cb) | |
1822 | { | |
1823 | struct io_kiocb *req = container_of(cb, struct io_kiocb, task_work); | |
1824 | ||
1825 | __io_req_task_submit(req); | |
1826 | } | |
1827 | ||
1828 | static void io_req_task_queue(struct io_kiocb *req) | |
1829 | { | |
c40f6379 JA |
1830 | int ret; |
1831 | ||
1832 | init_task_work(&req->task_work, io_req_task_submit); | |
1833 | ||
c2c4c83c | 1834 | ret = io_req_task_work_add(req, &req->task_work); |
c40f6379 | 1835 | if (unlikely(ret)) { |
c2c4c83c JA |
1836 | struct task_struct *tsk; |
1837 | ||
c40f6379 JA |
1838 | init_task_work(&req->task_work, io_req_task_cancel); |
1839 | tsk = io_wq_get_task(req->ctx->io_wq); | |
c2c4c83c JA |
1840 | task_work_add(tsk, &req->task_work, 0); |
1841 | wake_up_process(tsk); | |
c40f6379 | 1842 | } |
c40f6379 JA |
1843 | } |
1844 | ||
c3524383 | 1845 | static void io_queue_next(struct io_kiocb *req) |
c69f8dbe | 1846 | { |
9b5f7bd9 | 1847 | struct io_kiocb *nxt = io_req_find_next(req); |
944e58bf PB |
1848 | |
1849 | if (nxt) | |
906a8c3f | 1850 | io_req_task_queue(nxt); |
c69f8dbe JL |
1851 | } |
1852 | ||
c3524383 | 1853 | static void io_free_req(struct io_kiocb *req) |
7a743e22 | 1854 | { |
c3524383 PB |
1855 | io_queue_next(req); |
1856 | __io_free_req(req); | |
1857 | } | |
8766dd51 | 1858 | |
2d6500d4 PB |
1859 | struct req_batch { |
1860 | void *reqs[IO_IOPOLL_BATCH]; | |
1861 | int to_free; | |
7a743e22 | 1862 | |
5af1d13e PB |
1863 | struct task_struct *task; |
1864 | int task_refs; | |
2d6500d4 PB |
1865 | }; |
1866 | ||
5af1d13e PB |
1867 | static inline void io_init_req_batch(struct req_batch *rb) |
1868 | { | |
1869 | rb->to_free = 0; | |
1870 | rb->task_refs = 0; | |
1871 | rb->task = NULL; | |
1872 | } | |
1873 | ||
2d6500d4 PB |
1874 | static void __io_req_free_batch_flush(struct io_ring_ctx *ctx, |
1875 | struct req_batch *rb) | |
1876 | { | |
1877 | kmem_cache_free_bulk(req_cachep, rb->to_free, rb->reqs); | |
1878 | percpu_ref_put_many(&ctx->refs, rb->to_free); | |
1879 | rb->to_free = 0; | |
1880 | } | |
1881 | ||
1882 | static void io_req_free_batch_finish(struct io_ring_ctx *ctx, | |
1883 | struct req_batch *rb) | |
1884 | { | |
1885 | if (rb->to_free) | |
1886 | __io_req_free_batch_flush(ctx, rb); | |
5af1d13e PB |
1887 | if (rb->task) { |
1888 | put_task_struct_many(rb->task, rb->task_refs); | |
1889 | rb->task = NULL; | |
1890 | } | |
2d6500d4 PB |
1891 | } |
1892 | ||
1893 | static void io_req_free_batch(struct req_batch *rb, struct io_kiocb *req) | |
1894 | { | |
1895 | if (unlikely(io_is_fallback_req(req))) { | |
1896 | io_free_req(req); | |
1897 | return; | |
1898 | } | |
1899 | if (req->flags & REQ_F_LINK_HEAD) | |
1900 | io_queue_next(req); | |
1901 | ||
5af1d13e PB |
1902 | if (req->flags & REQ_F_TASK_PINNED) { |
1903 | if (req->task != rb->task) { | |
1904 | if (rb->task) | |
1905 | put_task_struct_many(rb->task, rb->task_refs); | |
1906 | rb->task = req->task; | |
1907 | rb->task_refs = 0; | |
1908 | } | |
1909 | rb->task_refs++; | |
1910 | req->flags &= ~REQ_F_TASK_PINNED; | |
1911 | } | |
1912 | ||
51a4cc11 | 1913 | WARN_ON_ONCE(io_dismantle_req(req)); |
2d6500d4 PB |
1914 | rb->reqs[rb->to_free++] = req; |
1915 | if (unlikely(rb->to_free == ARRAY_SIZE(rb->reqs))) | |
1916 | __io_req_free_batch_flush(req->ctx, rb); | |
7a743e22 PB |
1917 | } |
1918 | ||
ba816ad6 JA |
1919 | /* |
1920 | * Drop reference to request, return next in chain (if there is one) if this | |
1921 | * was the last reference to this request. | |
1922 | */ | |
9b5f7bd9 | 1923 | static struct io_kiocb *io_put_req_find_next(struct io_kiocb *req) |
e65ef56d | 1924 | { |
9b5f7bd9 PB |
1925 | struct io_kiocb *nxt = NULL; |
1926 | ||
2a44f467 | 1927 | if (refcount_dec_and_test(&req->refs)) { |
9b5f7bd9 | 1928 | nxt = io_req_find_next(req); |
4d7dd462 | 1929 | __io_free_req(req); |
2a44f467 | 1930 | } |
9b5f7bd9 | 1931 | return nxt; |
2b188cc1 JA |
1932 | } |
1933 | ||
e65ef56d JA |
1934 | static void io_put_req(struct io_kiocb *req) |
1935 | { | |
1936 | if (refcount_dec_and_test(&req->refs)) | |
1937 | io_free_req(req); | |
2b188cc1 JA |
1938 | } |
1939 | ||
f4db7182 | 1940 | static struct io_wq_work *io_steal_work(struct io_kiocb *req) |
7a743e22 | 1941 | { |
6df1db6b | 1942 | struct io_kiocb *nxt; |
f4db7182 | 1943 | |
7a743e22 | 1944 | /* |
f4db7182 PB |
1945 | * A ref is owned by io-wq in which context we're. So, if that's the |
1946 | * last one, it's safe to steal next work. False negatives are Ok, | |
1947 | * it just will be re-punted async in io_put_work() | |
7a743e22 | 1948 | */ |
f4db7182 PB |
1949 | if (refcount_read(&req->refs) != 1) |
1950 | return NULL; | |
7a743e22 | 1951 | |
9b5f7bd9 | 1952 | nxt = io_req_find_next(req); |
6df1db6b | 1953 | return nxt ? &nxt->work : NULL; |
7a743e22 PB |
1954 | } |
1955 | ||
978db57e JA |
1956 | /* |
1957 | * Must only be used if we don't need to care about links, usually from | |
1958 | * within the completion handling itself. | |
1959 | */ | |
1960 | static void __io_double_put_req(struct io_kiocb *req) | |
78e19bbe JA |
1961 | { |
1962 | /* drop both submit and complete references */ | |
1963 | if (refcount_sub_and_test(2, &req->refs)) | |
1964 | __io_free_req(req); | |
1965 | } | |
1966 | ||
978db57e JA |
1967 | static void io_double_put_req(struct io_kiocb *req) |
1968 | { | |
1969 | /* drop both submit and complete references */ | |
1970 | if (refcount_sub_and_test(2, &req->refs)) | |
1971 | io_free_req(req); | |
1972 | } | |
1973 | ||
1d7bb1d5 | 1974 | static unsigned io_cqring_events(struct io_ring_ctx *ctx, bool noflush) |
a3a0e43f | 1975 | { |
84f97dc2 JA |
1976 | struct io_rings *rings = ctx->rings; |
1977 | ||
ad3eb2c8 JA |
1978 | if (test_bit(0, &ctx->cq_check_overflow)) { |
1979 | /* | |
1980 | * noflush == true is from the waitqueue handler, just ensure | |
1981 | * we wake up the task, and the next invocation will flush the | |
1982 | * entries. We cannot safely to it from here. | |
1983 | */ | |
1984 | if (noflush && !list_empty(&ctx->cq_overflow_list)) | |
1985 | return -1U; | |
1d7bb1d5 | 1986 | |
ad3eb2c8 JA |
1987 | io_cqring_overflow_flush(ctx, false); |
1988 | } | |
1d7bb1d5 | 1989 | |
a3a0e43f JA |
1990 | /* See comment at the top of this file */ |
1991 | smp_rmb(); | |
ad3eb2c8 | 1992 | return ctx->cached_cq_tail - READ_ONCE(rings->cq.head); |
a3a0e43f JA |
1993 | } |
1994 | ||
fb5ccc98 PB |
1995 | static inline unsigned int io_sqring_entries(struct io_ring_ctx *ctx) |
1996 | { | |
1997 | struct io_rings *rings = ctx->rings; | |
1998 | ||
1999 | /* make sure SQ entry isn't read before tail */ | |
2000 | return smp_load_acquire(&rings->sq.tail) - ctx->cached_sq_head; | |
2001 | } | |
2002 | ||
8ff069bf | 2003 | static unsigned int io_put_kbuf(struct io_kiocb *req, struct io_buffer *kbuf) |
e94f141b | 2004 | { |
8ff069bf | 2005 | unsigned int cflags; |
e94f141b | 2006 | |
bcda7baa JA |
2007 | cflags = kbuf->bid << IORING_CQE_BUFFER_SHIFT; |
2008 | cflags |= IORING_CQE_F_BUFFER; | |
0e1b6fe3 | 2009 | req->flags &= ~REQ_F_BUFFER_SELECTED; |
bcda7baa JA |
2010 | kfree(kbuf); |
2011 | return cflags; | |
e94f141b JA |
2012 | } |
2013 | ||
8ff069bf | 2014 | static inline unsigned int io_put_rw_kbuf(struct io_kiocb *req) |
bcda7baa | 2015 | { |
4d954c25 | 2016 | struct io_buffer *kbuf; |
bcda7baa | 2017 | |
4d954c25 | 2018 | kbuf = (struct io_buffer *) (unsigned long) req->rw.addr; |
8ff069bf PB |
2019 | return io_put_kbuf(req, kbuf); |
2020 | } | |
2021 | ||
4c6e277c JA |
2022 | static inline bool io_run_task_work(void) |
2023 | { | |
2024 | if (current->task_works) { | |
2025 | __set_current_state(TASK_RUNNING); | |
2026 | task_work_run(); | |
2027 | return true; | |
2028 | } | |
2029 | ||
2030 | return false; | |
bcda7baa JA |
2031 | } |
2032 | ||
bbde017a XW |
2033 | static void io_iopoll_queue(struct list_head *again) |
2034 | { | |
2035 | struct io_kiocb *req; | |
2036 | ||
2037 | do { | |
d21ffe7e PB |
2038 | req = list_first_entry(again, struct io_kiocb, inflight_entry); |
2039 | list_del(&req->inflight_entry); | |
81b68a5c | 2040 | __io_complete_rw(req, -EAGAIN, 0, NULL); |
bbde017a XW |
2041 | } while (!list_empty(again)); |
2042 | } | |
2043 | ||
def596e9 JA |
2044 | /* |
2045 | * Find and free completed poll iocbs | |
2046 | */ | |
2047 | static void io_iopoll_complete(struct io_ring_ctx *ctx, unsigned int *nr_events, | |
2048 | struct list_head *done) | |
2049 | { | |
8237e045 | 2050 | struct req_batch rb; |
def596e9 | 2051 | struct io_kiocb *req; |
bbde017a XW |
2052 | LIST_HEAD(again); |
2053 | ||
2054 | /* order with ->result store in io_complete_rw_iopoll() */ | |
2055 | smp_rmb(); | |
def596e9 | 2056 | |
5af1d13e | 2057 | io_init_req_batch(&rb); |
def596e9 | 2058 | while (!list_empty(done)) { |
bcda7baa JA |
2059 | int cflags = 0; |
2060 | ||
d21ffe7e | 2061 | req = list_first_entry(done, struct io_kiocb, inflight_entry); |
bbde017a XW |
2062 | if (READ_ONCE(req->result) == -EAGAIN) { |
2063 | req->iopoll_completed = 0; | |
d21ffe7e | 2064 | list_move_tail(&req->inflight_entry, &again); |
bbde017a XW |
2065 | continue; |
2066 | } | |
d21ffe7e | 2067 | list_del(&req->inflight_entry); |
def596e9 | 2068 | |
bcda7baa | 2069 | if (req->flags & REQ_F_BUFFER_SELECTED) |
8ff069bf | 2070 | cflags = io_put_rw_kbuf(req); |
bcda7baa JA |
2071 | |
2072 | __io_cqring_fill_event(req, req->result, cflags); | |
def596e9 JA |
2073 | (*nr_events)++; |
2074 | ||
c3524383 | 2075 | if (refcount_dec_and_test(&req->refs)) |
2d6500d4 | 2076 | io_req_free_batch(&rb, req); |
def596e9 | 2077 | } |
def596e9 | 2078 | |
09bb8394 | 2079 | io_commit_cqring(ctx); |
32b2244a XW |
2080 | if (ctx->flags & IORING_SETUP_SQPOLL) |
2081 | io_cqring_ev_posted(ctx); | |
2d6500d4 | 2082 | io_req_free_batch_finish(ctx, &rb); |
581f9810 | 2083 | |
bbde017a XW |
2084 | if (!list_empty(&again)) |
2085 | io_iopoll_queue(&again); | |
581f9810 BM |
2086 | } |
2087 | ||
def596e9 JA |
2088 | static int io_do_iopoll(struct io_ring_ctx *ctx, unsigned int *nr_events, |
2089 | long min) | |
2090 | { | |
2091 | struct io_kiocb *req, *tmp; | |
2092 | LIST_HEAD(done); | |
2093 | bool spin; | |
2094 | int ret; | |
2095 | ||
2096 | /* | |
2097 | * Only spin for completions if we don't have multiple devices hanging | |
2098 | * off our complete list, and we're under the requested amount. | |
2099 | */ | |
2100 | spin = !ctx->poll_multi_file && *nr_events < min; | |
2101 | ||
2102 | ret = 0; | |
d21ffe7e | 2103 | list_for_each_entry_safe(req, tmp, &ctx->iopoll_list, inflight_entry) { |
9adbd45d | 2104 | struct kiocb *kiocb = &req->rw.kiocb; |
def596e9 JA |
2105 | |
2106 | /* | |
581f9810 BM |
2107 | * Move completed and retryable entries to our local lists. |
2108 | * If we find a request that requires polling, break out | |
2109 | * and complete those lists first, if we have entries there. | |
def596e9 | 2110 | */ |
65a6543d | 2111 | if (READ_ONCE(req->iopoll_completed)) { |
d21ffe7e | 2112 | list_move_tail(&req->inflight_entry, &done); |
def596e9 JA |
2113 | continue; |
2114 | } | |
2115 | if (!list_empty(&done)) | |
2116 | break; | |
2117 | ||
2118 | ret = kiocb->ki_filp->f_op->iopoll(kiocb, spin); | |
2119 | if (ret < 0) | |
2120 | break; | |
2121 | ||
3aadc23e PB |
2122 | /* iopoll may have completed current req */ |
2123 | if (READ_ONCE(req->iopoll_completed)) | |
d21ffe7e | 2124 | list_move_tail(&req->inflight_entry, &done); |
3aadc23e | 2125 | |
def596e9 JA |
2126 | if (ret && spin) |
2127 | spin = false; | |
2128 | ret = 0; | |
2129 | } | |
2130 | ||
2131 | if (!list_empty(&done)) | |
2132 | io_iopoll_complete(ctx, nr_events, &done); | |
2133 | ||
2134 | return ret; | |
2135 | } | |
2136 | ||
2137 | /* | |
d195a66e | 2138 | * Poll for a minimum of 'min' events. Note that if min == 0 we consider that a |
def596e9 JA |
2139 | * non-spinning poll check - we'll still enter the driver poll loop, but only |
2140 | * as a non-spinning completion check. | |
2141 | */ | |
2142 | static int io_iopoll_getevents(struct io_ring_ctx *ctx, unsigned int *nr_events, | |
2143 | long min) | |
2144 | { | |
540e32a0 | 2145 | while (!list_empty(&ctx->iopoll_list) && !need_resched()) { |
def596e9 JA |
2146 | int ret; |
2147 | ||
2148 | ret = io_do_iopoll(ctx, nr_events, min); | |
2149 | if (ret < 0) | |
2150 | return ret; | |
eba0a4dd | 2151 | if (*nr_events >= min) |
def596e9 JA |
2152 | return 0; |
2153 | } | |
2154 | ||
2155 | return 1; | |
2156 | } | |
2157 | ||
2158 | /* | |
2159 | * We can't just wait for polled events to come to us, we have to actively | |
2160 | * find and complete them. | |
2161 | */ | |
b2edc0a7 | 2162 | static void io_iopoll_try_reap_events(struct io_ring_ctx *ctx) |
def596e9 JA |
2163 | { |
2164 | if (!(ctx->flags & IORING_SETUP_IOPOLL)) | |
2165 | return; | |
2166 | ||
2167 | mutex_lock(&ctx->uring_lock); | |
540e32a0 | 2168 | while (!list_empty(&ctx->iopoll_list)) { |
def596e9 JA |
2169 | unsigned int nr_events = 0; |
2170 | ||
b2edc0a7 | 2171 | io_do_iopoll(ctx, &nr_events, 0); |
08f5439f | 2172 | |
b2edc0a7 PB |
2173 | /* let it sleep and repeat later if can't complete a request */ |
2174 | if (nr_events == 0) | |
2175 | break; | |
08f5439f JA |
2176 | /* |
2177 | * Ensure we allow local-to-the-cpu processing to take place, | |
2178 | * in this case we need to ensure that we reap all events. | |
3fcee5a6 | 2179 | * Also let task_work, etc. to progress by releasing the mutex |
08f5439f | 2180 | */ |
3fcee5a6 PB |
2181 | if (need_resched()) { |
2182 | mutex_unlock(&ctx->uring_lock); | |
2183 | cond_resched(); | |
2184 | mutex_lock(&ctx->uring_lock); | |
2185 | } | |
def596e9 JA |
2186 | } |
2187 | mutex_unlock(&ctx->uring_lock); | |
2188 | } | |
2189 | ||
7668b92a | 2190 | static int io_iopoll_check(struct io_ring_ctx *ctx, long min) |
def596e9 | 2191 | { |
7668b92a | 2192 | unsigned int nr_events = 0; |
2b2ed975 | 2193 | int iters = 0, ret = 0; |
500f9fba | 2194 | |
c7849be9 XW |
2195 | /* |
2196 | * We disallow the app entering submit/complete with polling, but we | |
2197 | * still need to lock the ring to prevent racing with polled issue | |
2198 | * that got punted to a workqueue. | |
2199 | */ | |
2200 | mutex_lock(&ctx->uring_lock); | |
def596e9 | 2201 | do { |
a3a0e43f JA |
2202 | /* |
2203 | * Don't enter poll loop if we already have events pending. | |
2204 | * If we do, we can potentially be spinning for commands that | |
2205 | * already triggered a CQE (eg in error). | |
2206 | */ | |
1d7bb1d5 | 2207 | if (io_cqring_events(ctx, false)) |
a3a0e43f JA |
2208 | break; |
2209 | ||
500f9fba JA |
2210 | /* |
2211 | * If a submit got punted to a workqueue, we can have the | |
2212 | * application entering polling for a command before it gets | |
2213 | * issued. That app will hold the uring_lock for the duration | |
2214 | * of the poll right here, so we need to take a breather every | |
2215 | * now and then to ensure that the issue has a chance to add | |
2216 | * the poll to the issued list. Otherwise we can spin here | |
2217 | * forever, while the workqueue is stuck trying to acquire the | |
2218 | * very same mutex. | |
2219 | */ | |
2220 | if (!(++iters & 7)) { | |
2221 | mutex_unlock(&ctx->uring_lock); | |
4c6e277c | 2222 | io_run_task_work(); |
500f9fba JA |
2223 | mutex_lock(&ctx->uring_lock); |
2224 | } | |
2225 | ||
7668b92a | 2226 | ret = io_iopoll_getevents(ctx, &nr_events, min); |
def596e9 JA |
2227 | if (ret <= 0) |
2228 | break; | |
2229 | ret = 0; | |
7668b92a | 2230 | } while (min && !nr_events && !need_resched()); |
def596e9 | 2231 | |
500f9fba | 2232 | mutex_unlock(&ctx->uring_lock); |
def596e9 JA |
2233 | return ret; |
2234 | } | |
2235 | ||
491381ce | 2236 | static void kiocb_end_write(struct io_kiocb *req) |
2b188cc1 | 2237 | { |
491381ce JA |
2238 | /* |
2239 | * Tell lockdep we inherited freeze protection from submission | |
2240 | * thread. | |
2241 | */ | |
2242 | if (req->flags & REQ_F_ISREG) { | |
2243 | struct inode *inode = file_inode(req->file); | |
2b188cc1 | 2244 | |
491381ce | 2245 | __sb_writers_acquired(inode->i_sb, SB_FREEZE_WRITE); |
2b188cc1 | 2246 | } |
491381ce | 2247 | file_end_write(req->file); |
2b188cc1 JA |
2248 | } |
2249 | ||
a1d7c393 JA |
2250 | static void io_complete_rw_common(struct kiocb *kiocb, long res, |
2251 | struct io_comp_state *cs) | |
2b188cc1 | 2252 | { |
9adbd45d | 2253 | struct io_kiocb *req = container_of(kiocb, struct io_kiocb, rw.kiocb); |
bcda7baa | 2254 | int cflags = 0; |
2b188cc1 | 2255 | |
491381ce JA |
2256 | if (kiocb->ki_flags & IOCB_WRITE) |
2257 | kiocb_end_write(req); | |
2b188cc1 | 2258 | |
4e88d6e7 JA |
2259 | if (res != req->result) |
2260 | req_set_fail_links(req); | |
bcda7baa | 2261 | if (req->flags & REQ_F_BUFFER_SELECTED) |
8ff069bf | 2262 | cflags = io_put_rw_kbuf(req); |
a1d7c393 | 2263 | __io_req_complete(req, res, cflags, cs); |
ba816ad6 JA |
2264 | } |
2265 | ||
b63534c4 JA |
2266 | #ifdef CONFIG_BLOCK |
2267 | static bool io_resubmit_prep(struct io_kiocb *req, int error) | |
2268 | { | |
2269 | struct iovec inline_vecs[UIO_FASTIOV], *iovec = inline_vecs; | |
2270 | ssize_t ret = -ECANCELED; | |
2271 | struct iov_iter iter; | |
2272 | int rw; | |
2273 | ||
2274 | if (error) { | |
2275 | ret = error; | |
2276 | goto end_req; | |
2277 | } | |
2278 | ||
2279 | switch (req->opcode) { | |
2280 | case IORING_OP_READV: | |
2281 | case IORING_OP_READ_FIXED: | |
2282 | case IORING_OP_READ: | |
2283 | rw = READ; | |
2284 | break; | |
2285 | case IORING_OP_WRITEV: | |
2286 | case IORING_OP_WRITE_FIXED: | |
2287 | case IORING_OP_WRITE: | |
2288 | rw = WRITE; | |
2289 | break; | |
2290 | default: | |
2291 | printk_once(KERN_WARNING "io_uring: bad opcode in resubmit %d\n", | |
2292 | req->opcode); | |
2293 | goto end_req; | |
2294 | } | |
2295 | ||
2296 | ret = io_import_iovec(rw, req, &iovec, &iter, false); | |
2297 | if (ret < 0) | |
2298 | goto end_req; | |
2299 | ret = io_setup_async_rw(req, ret, iovec, inline_vecs, &iter); | |
2300 | if (!ret) | |
2301 | return true; | |
2302 | kfree(iovec); | |
2303 | end_req: | |
b63534c4 | 2304 | req_set_fail_links(req); |
e1e16097 | 2305 | io_req_complete(req, ret); |
b63534c4 JA |
2306 | return false; |
2307 | } | |
2308 | ||
2309 | static void io_rw_resubmit(struct callback_head *cb) | |
2310 | { | |
2311 | struct io_kiocb *req = container_of(cb, struct io_kiocb, task_work); | |
2312 | struct io_ring_ctx *ctx = req->ctx; | |
2313 | int err; | |
2314 | ||
b63534c4 JA |
2315 | err = io_sq_thread_acquire_mm(ctx, req); |
2316 | ||
2317 | if (io_resubmit_prep(req, err)) { | |
2318 | refcount_inc(&req->refs); | |
2319 | io_queue_async_work(req); | |
2320 | } | |
2321 | } | |
2322 | #endif | |
2323 | ||
2324 | static bool io_rw_reissue(struct io_kiocb *req, long res) | |
2325 | { | |
2326 | #ifdef CONFIG_BLOCK | |
b63534c4 JA |
2327 | int ret; |
2328 | ||
2329 | if ((res != -EAGAIN && res != -EOPNOTSUPP) || io_wq_current_is_worker()) | |
2330 | return false; | |
2331 | ||
b63534c4 | 2332 | init_task_work(&req->task_work, io_rw_resubmit); |
c2c4c83c JA |
2333 | ret = io_req_task_work_add(req, &req->task_work); |
2334 | if (!ret) | |
b63534c4 JA |
2335 | return true; |
2336 | #endif | |
2337 | return false; | |
2338 | } | |
2339 | ||
a1d7c393 JA |
2340 | static void __io_complete_rw(struct io_kiocb *req, long res, long res2, |
2341 | struct io_comp_state *cs) | |
2342 | { | |
2343 | if (!io_rw_reissue(req, res)) | |
2344 | io_complete_rw_common(&req->rw.kiocb, res, cs); | |
ba816ad6 JA |
2345 | } |
2346 | ||
2347 | static void io_complete_rw(struct kiocb *kiocb, long res, long res2) | |
2348 | { | |
9adbd45d | 2349 | struct io_kiocb *req = container_of(kiocb, struct io_kiocb, rw.kiocb); |
ba816ad6 | 2350 | |
a1d7c393 | 2351 | __io_complete_rw(req, res, res2, NULL); |
2b188cc1 JA |
2352 | } |
2353 | ||
def596e9 JA |
2354 | static void io_complete_rw_iopoll(struct kiocb *kiocb, long res, long res2) |
2355 | { | |
9adbd45d | 2356 | struct io_kiocb *req = container_of(kiocb, struct io_kiocb, rw.kiocb); |
def596e9 | 2357 | |
491381ce JA |
2358 | if (kiocb->ki_flags & IOCB_WRITE) |
2359 | kiocb_end_write(req); | |
def596e9 | 2360 | |
2d7d6792 | 2361 | if (res != -EAGAIN && res != req->result) |
4e88d6e7 | 2362 | req_set_fail_links(req); |
bbde017a XW |
2363 | |
2364 | WRITE_ONCE(req->result, res); | |
2365 | /* order with io_poll_complete() checking ->result */ | |
cd664b0e PB |
2366 | smp_wmb(); |
2367 | WRITE_ONCE(req->iopoll_completed, 1); | |
def596e9 JA |
2368 | } |
2369 | ||
2370 | /* | |
2371 | * After the iocb has been issued, it's safe to be found on the poll list. | |
2372 | * Adding the kiocb to the list AFTER submission ensures that we don't | |
2373 | * find it from a io_iopoll_getevents() thread before the issuer is done | |
2374 | * accessing the kiocb cookie. | |
2375 | */ | |
2376 | static void io_iopoll_req_issued(struct io_kiocb *req) | |
2377 | { | |
2378 | struct io_ring_ctx *ctx = req->ctx; | |
2379 | ||
2380 | /* | |
2381 | * Track whether we have multiple files in our lists. This will impact | |
2382 | * how we do polling eventually, not spinning if we're on potentially | |
2383 | * different devices. | |
2384 | */ | |
540e32a0 | 2385 | if (list_empty(&ctx->iopoll_list)) { |
def596e9 JA |
2386 | ctx->poll_multi_file = false; |
2387 | } else if (!ctx->poll_multi_file) { | |
2388 | struct io_kiocb *list_req; | |
2389 | ||
540e32a0 | 2390 | list_req = list_first_entry(&ctx->iopoll_list, struct io_kiocb, |
d21ffe7e | 2391 | inflight_entry); |
9adbd45d | 2392 | if (list_req->file != req->file) |
def596e9 JA |
2393 | ctx->poll_multi_file = true; |
2394 | } | |
2395 | ||
2396 | /* | |
2397 | * For fast devices, IO may have already completed. If it has, add | |
2398 | * it to the front so we find it first. | |
2399 | */ | |
65a6543d | 2400 | if (READ_ONCE(req->iopoll_completed)) |
d21ffe7e | 2401 | list_add(&req->inflight_entry, &ctx->iopoll_list); |
def596e9 | 2402 | else |
d21ffe7e | 2403 | list_add_tail(&req->inflight_entry, &ctx->iopoll_list); |
bdcd3eab XW |
2404 | |
2405 | if ((ctx->flags & IORING_SETUP_SQPOLL) && | |
2406 | wq_has_sleeper(&ctx->sqo_wait)) | |
2407 | wake_up(&ctx->sqo_wait); | |
def596e9 JA |
2408 | } |
2409 | ||
9f13c35b | 2410 | static void __io_state_file_put(struct io_submit_state *state) |
9a56a232 | 2411 | { |
06ef3608 PB |
2412 | if (state->has_refs) |
2413 | fput_many(state->file, state->has_refs); | |
9f13c35b PB |
2414 | state->file = NULL; |
2415 | } | |
2416 | ||
2417 | static inline void io_state_file_put(struct io_submit_state *state) | |
2418 | { | |
2419 | if (state->file) | |
2420 | __io_state_file_put(state); | |
9a56a232 JA |
2421 | } |
2422 | ||
2423 | /* | |
2424 | * Get as many references to a file as we have IOs left in this submission, | |
2425 | * assuming most submissions are for one file, or at least that each file | |
2426 | * has more than one submission. | |
2427 | */ | |
8da11c19 | 2428 | static struct file *__io_file_get(struct io_submit_state *state, int fd) |
9a56a232 JA |
2429 | { |
2430 | if (!state) | |
2431 | return fget(fd); | |
2432 | ||
2433 | if (state->file) { | |
2434 | if (state->fd == fd) { | |
06ef3608 | 2435 | state->has_refs--; |
9a56a232 JA |
2436 | state->ios_left--; |
2437 | return state->file; | |
2438 | } | |
9f13c35b | 2439 | __io_state_file_put(state); |
9a56a232 JA |
2440 | } |
2441 | state->file = fget_many(fd, state->ios_left); | |
2442 | if (!state->file) | |
2443 | return NULL; | |
2444 | ||
2445 | state->fd = fd; | |
9a56a232 | 2446 | state->ios_left--; |
06ef3608 | 2447 | state->has_refs = state->ios_left; |
9a56a232 JA |
2448 | return state->file; |
2449 | } | |
2450 | ||
4503b767 JA |
2451 | static bool io_bdev_nowait(struct block_device *bdev) |
2452 | { | |
2453 | #ifdef CONFIG_BLOCK | |
2454 | return !bdev || queue_is_mq(bdev_get_queue(bdev)); | |
2455 | #else | |
2456 | return true; | |
2457 | #endif | |
2458 | } | |
2459 | ||
2b188cc1 JA |
2460 | /* |
2461 | * If we tracked the file through the SCM inflight mechanism, we could support | |
2462 | * any file. For now, just ensure that anything potentially problematic is done | |
2463 | * inline. | |
2464 | */ | |
af197f50 | 2465 | static bool io_file_supports_async(struct file *file, int rw) |
2b188cc1 JA |
2466 | { |
2467 | umode_t mode = file_inode(file)->i_mode; | |
2468 | ||
4503b767 JA |
2469 | if (S_ISBLK(mode)) { |
2470 | if (io_bdev_nowait(file->f_inode->i_bdev)) | |
2471 | return true; | |
2472 | return false; | |
2473 | } | |
2474 | if (S_ISCHR(mode) || S_ISSOCK(mode)) | |
2b188cc1 | 2475 | return true; |
4503b767 JA |
2476 | if (S_ISREG(mode)) { |
2477 | if (io_bdev_nowait(file->f_inode->i_sb->s_bdev) && | |
2478 | file->f_op != &io_uring_fops) | |
2479 | return true; | |
2480 | return false; | |
2481 | } | |
2b188cc1 | 2482 | |
c5b85625 JA |
2483 | /* any ->read/write should understand O_NONBLOCK */ |
2484 | if (file->f_flags & O_NONBLOCK) | |
2485 | return true; | |
2486 | ||
af197f50 JA |
2487 | if (!(file->f_mode & FMODE_NOWAIT)) |
2488 | return false; | |
2489 | ||
2490 | if (rw == READ) | |
2491 | return file->f_op->read_iter != NULL; | |
2492 | ||
2493 | return file->f_op->write_iter != NULL; | |
2b188cc1 JA |
2494 | } |
2495 | ||
3529d8c2 JA |
2496 | static int io_prep_rw(struct io_kiocb *req, const struct io_uring_sqe *sqe, |
2497 | bool force_nonblock) | |
2b188cc1 | 2498 | { |
def596e9 | 2499 | struct io_ring_ctx *ctx = req->ctx; |
9adbd45d | 2500 | struct kiocb *kiocb = &req->rw.kiocb; |
09bb8394 JA |
2501 | unsigned ioprio; |
2502 | int ret; | |
2b188cc1 | 2503 | |
491381ce JA |
2504 | if (S_ISREG(file_inode(req->file)->i_mode)) |
2505 | req->flags |= REQ_F_ISREG; | |
2506 | ||
2b188cc1 | 2507 | kiocb->ki_pos = READ_ONCE(sqe->off); |
ba04291e JA |
2508 | if (kiocb->ki_pos == -1 && !(req->file->f_mode & FMODE_STREAM)) { |
2509 | req->flags |= REQ_F_CUR_POS; | |
2510 | kiocb->ki_pos = req->file->f_pos; | |
2511 | } | |
2b188cc1 | 2512 | kiocb->ki_hint = ki_hint_validate(file_write_hint(kiocb->ki_filp)); |
3e577dcd PB |
2513 | kiocb->ki_flags = iocb_flags(kiocb->ki_filp); |
2514 | ret = kiocb_set_rw_flags(kiocb, READ_ONCE(sqe->rw_flags)); | |
2515 | if (unlikely(ret)) | |
2516 | return ret; | |
2b188cc1 JA |
2517 | |
2518 | ioprio = READ_ONCE(sqe->ioprio); | |
2519 | if (ioprio) { | |
2520 | ret = ioprio_check_cap(ioprio); | |
2521 | if (ret) | |
09bb8394 | 2522 | return ret; |
2b188cc1 JA |
2523 | |
2524 | kiocb->ki_ioprio = ioprio; | |
2525 | } else | |
2526 | kiocb->ki_ioprio = get_current_ioprio(); | |
2527 | ||
8449eeda | 2528 | /* don't allow async punt if RWF_NOWAIT was requested */ |
c5b85625 | 2529 | if (kiocb->ki_flags & IOCB_NOWAIT) |
8449eeda SB |
2530 | req->flags |= REQ_F_NOWAIT; |
2531 | ||
b63534c4 JA |
2532 | if (kiocb->ki_flags & IOCB_DIRECT) |
2533 | io_get_req_task(req); | |
2534 | ||
8449eeda | 2535 | if (force_nonblock) |
2b188cc1 | 2536 | kiocb->ki_flags |= IOCB_NOWAIT; |
8449eeda | 2537 | |
def596e9 | 2538 | if (ctx->flags & IORING_SETUP_IOPOLL) { |
def596e9 JA |
2539 | if (!(kiocb->ki_flags & IOCB_DIRECT) || |
2540 | !kiocb->ki_filp->f_op->iopoll) | |
09bb8394 | 2541 | return -EOPNOTSUPP; |
2b188cc1 | 2542 | |
def596e9 JA |
2543 | kiocb->ki_flags |= IOCB_HIPRI; |
2544 | kiocb->ki_complete = io_complete_rw_iopoll; | |
65a6543d | 2545 | req->iopoll_completed = 0; |
f3a6fa22 | 2546 | io_get_req_task(req); |
def596e9 | 2547 | } else { |
09bb8394 JA |
2548 | if (kiocb->ki_flags & IOCB_HIPRI) |
2549 | return -EINVAL; | |
def596e9 JA |
2550 | kiocb->ki_complete = io_complete_rw; |
2551 | } | |
9adbd45d | 2552 | |
3529d8c2 JA |
2553 | req->rw.addr = READ_ONCE(sqe->addr); |
2554 | req->rw.len = READ_ONCE(sqe->len); | |
4f4eeba8 | 2555 | req->buf_index = READ_ONCE(sqe->buf_index); |
2b188cc1 | 2556 | return 0; |
2b188cc1 JA |
2557 | } |
2558 | ||
2559 | static inline void io_rw_done(struct kiocb *kiocb, ssize_t ret) | |
2560 | { | |
2561 | switch (ret) { | |
2562 | case -EIOCBQUEUED: | |
2563 | break; | |
2564 | case -ERESTARTSYS: | |
2565 | case -ERESTARTNOINTR: | |
2566 | case -ERESTARTNOHAND: | |
2567 | case -ERESTART_RESTARTBLOCK: | |
2568 | /* | |
2569 | * We can't just restart the syscall, since previously | |
2570 | * submitted sqes may already be in progress. Just fail this | |
2571 | * IO with EINTR. | |
2572 | */ | |
2573 | ret = -EINTR; | |
2574 | /* fall through */ | |
2575 | default: | |
2576 | kiocb->ki_complete(kiocb, ret, 0); | |
2577 | } | |
2578 | } | |
2579 | ||
a1d7c393 JA |
2580 | static void kiocb_done(struct kiocb *kiocb, ssize_t ret, |
2581 | struct io_comp_state *cs) | |
ba816ad6 | 2582 | { |
ba04291e JA |
2583 | struct io_kiocb *req = container_of(kiocb, struct io_kiocb, rw.kiocb); |
2584 | ||
2585 | if (req->flags & REQ_F_CUR_POS) | |
2586 | req->file->f_pos = kiocb->ki_pos; | |
bcaec089 | 2587 | if (ret >= 0 && kiocb->ki_complete == io_complete_rw) |
a1d7c393 | 2588 | __io_complete_rw(req, ret, 0, cs); |
ba816ad6 JA |
2589 | else |
2590 | io_rw_done(kiocb, ret); | |
2591 | } | |
2592 | ||
9adbd45d | 2593 | static ssize_t io_import_fixed(struct io_kiocb *req, int rw, |
7d009165 | 2594 | struct iov_iter *iter) |
edafccee | 2595 | { |
9adbd45d JA |
2596 | struct io_ring_ctx *ctx = req->ctx; |
2597 | size_t len = req->rw.len; | |
edafccee | 2598 | struct io_mapped_ubuf *imu; |
4f4eeba8 | 2599 | u16 index, buf_index; |
edafccee JA |
2600 | size_t offset; |
2601 | u64 buf_addr; | |
2602 | ||
2603 | /* attempt to use fixed buffers without having provided iovecs */ | |
2604 | if (unlikely(!ctx->user_bufs)) | |
2605 | return -EFAULT; | |
2606 | ||
4f4eeba8 | 2607 | buf_index = req->buf_index; |
edafccee JA |
2608 | if (unlikely(buf_index >= ctx->nr_user_bufs)) |
2609 | return -EFAULT; | |
2610 | ||
2611 | index = array_index_nospec(buf_index, ctx->nr_user_bufs); | |
2612 | imu = &ctx->user_bufs[index]; | |
9adbd45d | 2613 | buf_addr = req->rw.addr; |
edafccee JA |
2614 | |
2615 | /* overflow */ | |
2616 | if (buf_addr + len < buf_addr) | |
2617 | return -EFAULT; | |
2618 | /* not inside the mapped region */ | |
2619 | if (buf_addr < imu->ubuf || buf_addr + len > imu->ubuf + imu->len) | |
2620 | return -EFAULT; | |
2621 | ||
2622 | /* | |
2623 | * May not be a start of buffer, set size appropriately | |
2624 | * and advance us to the beginning. | |
2625 | */ | |
2626 | offset = buf_addr - imu->ubuf; | |
2627 | iov_iter_bvec(iter, rw, imu->bvec, imu->nr_bvecs, offset + len); | |
bd11b3a3 JA |
2628 | |
2629 | if (offset) { | |
2630 | /* | |
2631 | * Don't use iov_iter_advance() here, as it's really slow for | |
2632 | * using the latter parts of a big fixed buffer - it iterates | |
2633 | * over each segment manually. We can cheat a bit here, because | |
2634 | * we know that: | |
2635 | * | |
2636 | * 1) it's a BVEC iter, we set it up | |
2637 | * 2) all bvecs are PAGE_SIZE in size, except potentially the | |
2638 | * first and last bvec | |
2639 | * | |
2640 | * So just find our index, and adjust the iterator afterwards. | |
2641 | * If the offset is within the first bvec (or the whole first | |
2642 | * bvec, just use iov_iter_advance(). This makes it easier | |
2643 | * since we can just skip the first segment, which may not | |
2644 | * be PAGE_SIZE aligned. | |
2645 | */ | |
2646 | const struct bio_vec *bvec = imu->bvec; | |
2647 | ||
2648 | if (offset <= bvec->bv_len) { | |
2649 | iov_iter_advance(iter, offset); | |
2650 | } else { | |
2651 | unsigned long seg_skip; | |
2652 | ||
2653 | /* skip first vec */ | |
2654 | offset -= bvec->bv_len; | |
2655 | seg_skip = 1 + (offset >> PAGE_SHIFT); | |
2656 | ||
2657 | iter->bvec = bvec + seg_skip; | |
2658 | iter->nr_segs -= seg_skip; | |
99c79f66 | 2659 | iter->count -= bvec->bv_len + offset; |
bd11b3a3 | 2660 | iter->iov_offset = offset & ~PAGE_MASK; |
bd11b3a3 JA |
2661 | } |
2662 | } | |
2663 | ||
5e559561 | 2664 | return len; |
edafccee JA |
2665 | } |
2666 | ||
bcda7baa JA |
2667 | static void io_ring_submit_unlock(struct io_ring_ctx *ctx, bool needs_lock) |
2668 | { | |
2669 | if (needs_lock) | |
2670 | mutex_unlock(&ctx->uring_lock); | |
2671 | } | |
2672 | ||
2673 | static void io_ring_submit_lock(struct io_ring_ctx *ctx, bool needs_lock) | |
2674 | { | |
2675 | /* | |
2676 | * "Normal" inline submissions always hold the uring_lock, since we | |
2677 | * grab it from the system call. Same is true for the SQPOLL offload. | |
2678 | * The only exception is when we've detached the request and issue it | |
2679 | * from an async worker thread, grab the lock for that case. | |
2680 | */ | |
2681 | if (needs_lock) | |
2682 | mutex_lock(&ctx->uring_lock); | |
2683 | } | |
2684 | ||
2685 | static struct io_buffer *io_buffer_select(struct io_kiocb *req, size_t *len, | |
2686 | int bgid, struct io_buffer *kbuf, | |
2687 | bool needs_lock) | |
2688 | { | |
2689 | struct io_buffer *head; | |
2690 | ||
2691 | if (req->flags & REQ_F_BUFFER_SELECTED) | |
2692 | return kbuf; | |
2693 | ||
2694 | io_ring_submit_lock(req->ctx, needs_lock); | |
2695 | ||
2696 | lockdep_assert_held(&req->ctx->uring_lock); | |
2697 | ||
2698 | head = idr_find(&req->ctx->io_buffer_idr, bgid); | |
2699 | if (head) { | |
2700 | if (!list_empty(&head->list)) { | |
2701 | kbuf = list_last_entry(&head->list, struct io_buffer, | |
2702 | list); | |
2703 | list_del(&kbuf->list); | |
2704 | } else { | |
2705 | kbuf = head; | |
2706 | idr_remove(&req->ctx->io_buffer_idr, bgid); | |
2707 | } | |
2708 | if (*len > kbuf->len) | |
2709 | *len = kbuf->len; | |
2710 | } else { | |
2711 | kbuf = ERR_PTR(-ENOBUFS); | |
2712 | } | |
2713 | ||
2714 | io_ring_submit_unlock(req->ctx, needs_lock); | |
2715 | ||
2716 | return kbuf; | |
2717 | } | |
2718 | ||
4d954c25 JA |
2719 | static void __user *io_rw_buffer_select(struct io_kiocb *req, size_t *len, |
2720 | bool needs_lock) | |
2721 | { | |
2722 | struct io_buffer *kbuf; | |
4f4eeba8 | 2723 | u16 bgid; |
4d954c25 JA |
2724 | |
2725 | kbuf = (struct io_buffer *) (unsigned long) req->rw.addr; | |
4f4eeba8 | 2726 | bgid = req->buf_index; |
4d954c25 JA |
2727 | kbuf = io_buffer_select(req, len, bgid, kbuf, needs_lock); |
2728 | if (IS_ERR(kbuf)) | |
2729 | return kbuf; | |
2730 | req->rw.addr = (u64) (unsigned long) kbuf; | |
2731 | req->flags |= REQ_F_BUFFER_SELECTED; | |
2732 | return u64_to_user_ptr(kbuf->addr); | |
2733 | } | |
2734 | ||
2735 | #ifdef CONFIG_COMPAT | |
2736 | static ssize_t io_compat_import(struct io_kiocb *req, struct iovec *iov, | |
2737 | bool needs_lock) | |
2738 | { | |
2739 | struct compat_iovec __user *uiov; | |
2740 | compat_ssize_t clen; | |
2741 | void __user *buf; | |
2742 | ssize_t len; | |
2743 | ||
2744 | uiov = u64_to_user_ptr(req->rw.addr); | |
2745 | if (!access_ok(uiov, sizeof(*uiov))) | |
2746 | return -EFAULT; | |
2747 | if (__get_user(clen, &uiov->iov_len)) | |
2748 | return -EFAULT; | |
2749 | if (clen < 0) | |
2750 | return -EINVAL; | |
2751 | ||
2752 | len = clen; | |
2753 | buf = io_rw_buffer_select(req, &len, needs_lock); | |
2754 | if (IS_ERR(buf)) | |
2755 | return PTR_ERR(buf); | |
2756 | iov[0].iov_base = buf; | |
2757 | iov[0].iov_len = (compat_size_t) len; | |
2758 | return 0; | |
2759 | } | |
2760 | #endif | |
2761 | ||
2762 | static ssize_t __io_iov_buffer_select(struct io_kiocb *req, struct iovec *iov, | |
2763 | bool needs_lock) | |
2764 | { | |
2765 | struct iovec __user *uiov = u64_to_user_ptr(req->rw.addr); | |
2766 | void __user *buf; | |
2767 | ssize_t len; | |
2768 | ||
2769 | if (copy_from_user(iov, uiov, sizeof(*uiov))) | |
2770 | return -EFAULT; | |
2771 | ||
2772 | len = iov[0].iov_len; | |
2773 | if (len < 0) | |
2774 | return -EINVAL; | |
2775 | buf = io_rw_buffer_select(req, &len, needs_lock); | |
2776 | if (IS_ERR(buf)) | |
2777 | return PTR_ERR(buf); | |
2778 | iov[0].iov_base = buf; | |
2779 | iov[0].iov_len = len; | |
2780 | return 0; | |
2781 | } | |
2782 | ||
2783 | static ssize_t io_iov_buffer_select(struct io_kiocb *req, struct iovec *iov, | |
2784 | bool needs_lock) | |
2785 | { | |
dddb3e26 JA |
2786 | if (req->flags & REQ_F_BUFFER_SELECTED) { |
2787 | struct io_buffer *kbuf; | |
2788 | ||
2789 | kbuf = (struct io_buffer *) (unsigned long) req->rw.addr; | |
2790 | iov[0].iov_base = u64_to_user_ptr(kbuf->addr); | |
2791 | iov[0].iov_len = kbuf->len; | |
4d954c25 | 2792 | return 0; |
dddb3e26 | 2793 | } |
4d954c25 JA |
2794 | if (!req->rw.len) |
2795 | return 0; | |
2796 | else if (req->rw.len > 1) | |
2797 | return -EINVAL; | |
2798 | ||
2799 | #ifdef CONFIG_COMPAT | |
2800 | if (req->ctx->compat) | |
2801 | return io_compat_import(req, iov, needs_lock); | |
2802 | #endif | |
2803 | ||
2804 | return __io_iov_buffer_select(req, iov, needs_lock); | |
2805 | } | |
2806 | ||
cf6fd4bd | 2807 | static ssize_t io_import_iovec(int rw, struct io_kiocb *req, |
bcda7baa JA |
2808 | struct iovec **iovec, struct iov_iter *iter, |
2809 | bool needs_lock) | |
2b188cc1 | 2810 | { |
9adbd45d JA |
2811 | void __user *buf = u64_to_user_ptr(req->rw.addr); |
2812 | size_t sqe_len = req->rw.len; | |
4d954c25 | 2813 | ssize_t ret; |
edafccee JA |
2814 | u8 opcode; |
2815 | ||
d625c6ee | 2816 | opcode = req->opcode; |
7d009165 | 2817 | if (opcode == IORING_OP_READ_FIXED || opcode == IORING_OP_WRITE_FIXED) { |
edafccee | 2818 | *iovec = NULL; |
9adbd45d | 2819 | return io_import_fixed(req, rw, iter); |
edafccee | 2820 | } |
2b188cc1 | 2821 | |
bcda7baa | 2822 | /* buffer index only valid with fixed read/write, or buffer select */ |
4f4eeba8 | 2823 | if (req->buf_index && !(req->flags & REQ_F_BUFFER_SELECT)) |
9adbd45d JA |
2824 | return -EINVAL; |
2825 | ||
3a6820f2 | 2826 | if (opcode == IORING_OP_READ || opcode == IORING_OP_WRITE) { |
bcda7baa | 2827 | if (req->flags & REQ_F_BUFFER_SELECT) { |
4d954c25 JA |
2828 | buf = io_rw_buffer_select(req, &sqe_len, needs_lock); |
2829 | if (IS_ERR(buf)) { | |
bcda7baa | 2830 | *iovec = NULL; |
4d954c25 | 2831 | return PTR_ERR(buf); |
bcda7baa | 2832 | } |
3f9d6441 | 2833 | req->rw.len = sqe_len; |
bcda7baa JA |
2834 | } |
2835 | ||
3a6820f2 JA |
2836 | ret = import_single_range(rw, buf, sqe_len, *iovec, iter); |
2837 | *iovec = NULL; | |
3a901598 | 2838 | return ret < 0 ? ret : sqe_len; |
3a6820f2 JA |
2839 | } |
2840 | ||
f67676d1 JA |
2841 | if (req->io) { |
2842 | struct io_async_rw *iorw = &req->io->rw; | |
2843 | ||
252917c3 PB |
2844 | iov_iter_init(iter, rw, iorw->iov, iorw->nr_segs, iorw->size); |
2845 | *iovec = NULL; | |
f67676d1 JA |
2846 | return iorw->size; |
2847 | } | |
2848 | ||
4d954c25 JA |
2849 | if (req->flags & REQ_F_BUFFER_SELECT) { |
2850 | ret = io_iov_buffer_select(req, *iovec, needs_lock); | |
3f9d6441 JA |
2851 | if (!ret) { |
2852 | ret = (*iovec)->iov_len; | |
2853 | iov_iter_init(iter, rw, *iovec, 1, ret); | |
2854 | } | |
4d954c25 JA |
2855 | *iovec = NULL; |
2856 | return ret; | |
2857 | } | |
2858 | ||
2b188cc1 | 2859 | #ifdef CONFIG_COMPAT |
cf6fd4bd | 2860 | if (req->ctx->compat) |
2b188cc1 JA |
2861 | return compat_import_iovec(rw, buf, sqe_len, UIO_FASTIOV, |
2862 | iovec, iter); | |
2863 | #endif | |
2864 | ||
2865 | return import_iovec(rw, buf, sqe_len, UIO_FASTIOV, iovec, iter); | |
2866 | } | |
2867 | ||
31b51510 | 2868 | /* |
32960613 JA |
2869 | * For files that don't have ->read_iter() and ->write_iter(), handle them |
2870 | * by looping over ->read() or ->write() manually. | |
31b51510 | 2871 | */ |
32960613 JA |
2872 | static ssize_t loop_rw_iter(int rw, struct file *file, struct kiocb *kiocb, |
2873 | struct iov_iter *iter) | |
2874 | { | |
2875 | ssize_t ret = 0; | |
2876 | ||
2877 | /* | |
2878 | * Don't support polled IO through this interface, and we can't | |
2879 | * support non-blocking either. For the latter, this just causes | |
2880 | * the kiocb to be handled from an async context. | |
2881 | */ | |
2882 | if (kiocb->ki_flags & IOCB_HIPRI) | |
2883 | return -EOPNOTSUPP; | |
2884 | if (kiocb->ki_flags & IOCB_NOWAIT) | |
2885 | return -EAGAIN; | |
2886 | ||
2887 | while (iov_iter_count(iter)) { | |
311ae9e1 | 2888 | struct iovec iovec; |
32960613 JA |
2889 | ssize_t nr; |
2890 | ||
311ae9e1 PB |
2891 | if (!iov_iter_is_bvec(iter)) { |
2892 | iovec = iov_iter_iovec(iter); | |
2893 | } else { | |
2894 | /* fixed buffers import bvec */ | |
2895 | iovec.iov_base = kmap(iter->bvec->bv_page) | |
2896 | + iter->iov_offset; | |
2897 | iovec.iov_len = min(iter->count, | |
2898 | iter->bvec->bv_len - iter->iov_offset); | |
2899 | } | |
2900 | ||
32960613 JA |
2901 | if (rw == READ) { |
2902 | nr = file->f_op->read(file, iovec.iov_base, | |
2903 | iovec.iov_len, &kiocb->ki_pos); | |
2904 | } else { | |
2905 | nr = file->f_op->write(file, iovec.iov_base, | |
2906 | iovec.iov_len, &kiocb->ki_pos); | |
2907 | } | |
2908 | ||
311ae9e1 PB |
2909 | if (iov_iter_is_bvec(iter)) |
2910 | kunmap(iter->bvec->bv_page); | |
2911 | ||
32960613 JA |
2912 | if (nr < 0) { |
2913 | if (!ret) | |
2914 | ret = nr; | |
2915 | break; | |
2916 | } | |
2917 | ret += nr; | |
2918 | if (nr != iovec.iov_len) | |
2919 | break; | |
2920 | iov_iter_advance(iter, nr); | |
2921 | } | |
2922 | ||
2923 | return ret; | |
2924 | } | |
2925 | ||
b7bb4f7d | 2926 | static void io_req_map_rw(struct io_kiocb *req, ssize_t io_size, |
f67676d1 JA |
2927 | struct iovec *iovec, struct iovec *fast_iov, |
2928 | struct iov_iter *iter) | |
2929 | { | |
b64e3444 PB |
2930 | struct io_async_rw *rw = &req->io->rw; |
2931 | ||
2932 | rw->nr_segs = iter->nr_segs; | |
2933 | rw->size = io_size; | |
2934 | if (!iovec) { | |
2935 | rw->iov = rw->fast_iov; | |
2936 | if (rw->iov != fast_iov) | |
2937 | memcpy(rw->iov, fast_iov, | |
45097dae | 2938 | sizeof(struct iovec) * iter->nr_segs); |
99bc4c38 | 2939 | } else { |
b64e3444 | 2940 | rw->iov = iovec; |
99bc4c38 | 2941 | req->flags |= REQ_F_NEED_CLEANUP; |
f67676d1 JA |
2942 | } |
2943 | } | |
2944 | ||
3d9932a8 XW |
2945 | static inline int __io_alloc_async_ctx(struct io_kiocb *req) |
2946 | { | |
2947 | req->io = kmalloc(sizeof(*req->io), GFP_KERNEL); | |
2948 | return req->io == NULL; | |
2949 | } | |
2950 | ||
b7bb4f7d | 2951 | static int io_alloc_async_ctx(struct io_kiocb *req) |
f67676d1 | 2952 | { |
d3656344 JA |
2953 | if (!io_op_defs[req->opcode].async_ctx) |
2954 | return 0; | |
3d9932a8 XW |
2955 | |
2956 | return __io_alloc_async_ctx(req); | |
b7bb4f7d JA |
2957 | } |
2958 | ||
b7bb4f7d JA |
2959 | static int io_setup_async_rw(struct io_kiocb *req, ssize_t io_size, |
2960 | struct iovec *iovec, struct iovec *fast_iov, | |
2961 | struct iov_iter *iter) | |
2962 | { | |
980ad263 | 2963 | if (!io_op_defs[req->opcode].async_ctx) |
74566df3 | 2964 | return 0; |
5d204bcf | 2965 | if (!req->io) { |
3d9932a8 | 2966 | if (__io_alloc_async_ctx(req)) |
5d204bcf | 2967 | return -ENOMEM; |
b7bb4f7d | 2968 | |
5d204bcf JA |
2969 | io_req_map_rw(req, io_size, iovec, fast_iov, iter); |
2970 | } | |
b7bb4f7d | 2971 | return 0; |
f67676d1 JA |
2972 | } |
2973 | ||
c3e330a4 PB |
2974 | static inline int io_rw_prep_async(struct io_kiocb *req, int rw, |
2975 | bool force_nonblock) | |
2976 | { | |
2977 | struct io_async_ctx *io = req->io; | |
2978 | struct iov_iter iter; | |
2979 | ssize_t ret; | |
2980 | ||
2981 | io->rw.iov = io->rw.fast_iov; | |
2982 | req->io = NULL; | |
2983 | ret = io_import_iovec(rw, req, &io->rw.iov, &iter, !force_nonblock); | |
2984 | req->io = io; | |
2985 | if (unlikely(ret < 0)) | |
2986 | return ret; | |
2987 | ||
2988 | io_req_map_rw(req, ret, io->rw.iov, io->rw.fast_iov, &iter); | |
2989 | return 0; | |
2990 | } | |
2991 | ||
3529d8c2 JA |
2992 | static int io_read_prep(struct io_kiocb *req, const struct io_uring_sqe *sqe, |
2993 | bool force_nonblock) | |
f67676d1 JA |
2994 | { |
2995 | ssize_t ret; | |
2996 | ||
3529d8c2 JA |
2997 | ret = io_prep_rw(req, sqe, force_nonblock); |
2998 | if (ret) | |
2999 | return ret; | |
f67676d1 | 3000 | |
3529d8c2 JA |
3001 | if (unlikely(!(req->file->f_mode & FMODE_READ))) |
3002 | return -EBADF; | |
f67676d1 | 3003 | |
5f798bea PB |
3004 | /* either don't need iovec imported or already have it */ |
3005 | if (!req->io || req->flags & REQ_F_NEED_CLEANUP) | |
3529d8c2 | 3006 | return 0; |
c3e330a4 | 3007 | return io_rw_prep_async(req, READ, force_nonblock); |
f67676d1 JA |
3008 | } |
3009 | ||
c1dd91d1 JA |
3010 | /* |
3011 | * This is our waitqueue callback handler, registered through lock_page_async() | |
3012 | * when we initially tried to do the IO with the iocb armed our waitqueue. | |
3013 | * This gets called when the page is unlocked, and we generally expect that to | |
3014 | * happen when the page IO is completed and the page is now uptodate. This will | |
3015 | * queue a task_work based retry of the operation, attempting to copy the data | |
3016 | * again. If the latter fails because the page was NOT uptodate, then we will | |
3017 | * do a thread based blocking retry of the operation. That's the unexpected | |
3018 | * slow path. | |
3019 | */ | |
bcf5a063 JA |
3020 | static int io_async_buf_func(struct wait_queue_entry *wait, unsigned mode, |
3021 | int sync, void *arg) | |
3022 | { | |
3023 | struct wait_page_queue *wpq; | |
3024 | struct io_kiocb *req = wait->private; | |
bcf5a063 | 3025 | struct wait_page_key *key = arg; |
bcf5a063 JA |
3026 | int ret; |
3027 | ||
3028 | wpq = container_of(wait, struct wait_page_queue, wait); | |
3029 | ||
cdc8fcb4 LT |
3030 | if (!wake_page_match(wpq, key)) |
3031 | return 0; | |
3032 | ||
bcf5a063 JA |
3033 | list_del_init(&wait->entry); |
3034 | ||
e7375122 | 3035 | init_task_work(&req->task_work, io_req_task_submit); |
bcf5a063 JA |
3036 | /* submit ref gets dropped, acquire a new one */ |
3037 | refcount_inc(&req->refs); | |
e7375122 | 3038 | ret = io_req_task_work_add(req, &req->task_work); |
bcf5a063 | 3039 | if (unlikely(ret)) { |
c2c4c83c JA |
3040 | struct task_struct *tsk; |
3041 | ||
bcf5a063 | 3042 | /* queue just for cancelation */ |
e7375122 | 3043 | init_task_work(&req->task_work, io_req_task_cancel); |
bcf5a063 | 3044 | tsk = io_wq_get_task(req->ctx->io_wq); |
e7375122 | 3045 | task_work_add(tsk, &req->task_work, 0); |
c2c4c83c | 3046 | wake_up_process(tsk); |
bcf5a063 | 3047 | } |
bcf5a063 JA |
3048 | return 1; |
3049 | } | |
3050 | ||
cdc8fcb4 LT |
3051 | static inline int kiocb_wait_page_queue_init(struct kiocb *kiocb, |
3052 | struct wait_page_queue *wait, | |
3053 | wait_queue_func_t func, | |
3054 | void *data) | |
3055 | { | |
3056 | /* Can't support async wakeup with polled IO */ | |
3057 | if (kiocb->ki_flags & IOCB_HIPRI) | |
3058 | return -EINVAL; | |
3059 | if (kiocb->ki_filp->f_mode & FMODE_BUF_RASYNC) { | |
3060 | wait->wait.func = func; | |
3061 | wait->wait.private = data; | |
3062 | wait->wait.flags = 0; | |
3063 | INIT_LIST_HEAD(&wait->wait.entry); | |
3064 | kiocb->ki_flags |= IOCB_WAITQ; | |
3065 | kiocb->ki_waitq = wait; | |
3066 | return 0; | |
3067 | } | |
3068 | ||
3069 | return -EOPNOTSUPP; | |
f67676d1 JA |
3070 | } |
3071 | ||
c1dd91d1 JA |
3072 | /* |
3073 | * This controls whether a given IO request should be armed for async page | |
3074 | * based retry. If we return false here, the request is handed to the async | |
3075 | * worker threads for retry. If we're doing buffered reads on a regular file, | |
3076 | * we prepare a private wait_page_queue entry and retry the operation. This | |
3077 | * will either succeed because the page is now uptodate and unlocked, or it | |
3078 | * will register a callback when the page is unlocked at IO completion. Through | |
3079 | * that callback, io_uring uses task_work to setup a retry of the operation. | |
3080 | * That retry will attempt the buffered read again. The retry will generally | |
3081 | * succeed, or in rare cases where it fails, we then fall back to using the | |
3082 | * async worker threads for a blocking retry. | |
3083 | */ | |
bcf5a063 | 3084 | static bool io_rw_should_retry(struct io_kiocb *req) |
f67676d1 | 3085 | { |
bcf5a063 JA |
3086 | struct kiocb *kiocb = &req->rw.kiocb; |
3087 | int ret; | |
f67676d1 | 3088 | |
bcf5a063 JA |
3089 | /* never retry for NOWAIT, we just complete with -EAGAIN */ |
3090 | if (req->flags & REQ_F_NOWAIT) | |
3091 | return false; | |
f67676d1 | 3092 | |
bcf5a063 JA |
3093 | /* already tried, or we're doing O_DIRECT */ |
3094 | if (kiocb->ki_flags & (IOCB_DIRECT | IOCB_WAITQ)) | |
3095 | return false; | |
3096 | /* | |
3097 | * just use poll if we can, and don't attempt if the fs doesn't | |
3098 | * support callback based unlocks | |
3099 | */ | |
3100 | if (file_can_poll(req->file) || !(req->file->f_mode & FMODE_BUF_RASYNC)) | |
3101 | return false; | |
f67676d1 | 3102 | |
bcf5a063 JA |
3103 | /* |
3104 | * If request type doesn't require req->io to defer in general, | |
3105 | * we need to allocate it here | |
3106 | */ | |
3107 | if (!req->io && __io_alloc_async_ctx(req)) | |
3108 | return false; | |
3529d8c2 | 3109 | |
bcf5a063 JA |
3110 | ret = kiocb_wait_page_queue_init(kiocb, &req->io->rw.wpq, |
3111 | io_async_buf_func, req); | |
3112 | if (!ret) { | |
3113 | io_get_req_task(req); | |
3114 | return true; | |
3115 | } | |
3529d8c2 | 3116 | |
bcf5a063 JA |
3117 | return false; |
3118 | } | |
3119 | ||
3120 | static int io_iter_do_read(struct io_kiocb *req, struct iov_iter *iter) | |
3121 | { | |
3122 | if (req->file->f_op->read_iter) | |
3123 | return call_read_iter(req->file, &req->rw.kiocb, iter); | |
2dd2111d GH |
3124 | else if (req->file->f_op->read) |
3125 | return loop_rw_iter(READ, req->file, &req->rw.kiocb, iter); | |
3126 | else | |
3127 | return -EINVAL; | |
f67676d1 JA |
3128 | } |
3129 | ||
a1d7c393 JA |
3130 | static int io_read(struct io_kiocb *req, bool force_nonblock, |
3131 | struct io_comp_state *cs) | |
2b188cc1 JA |
3132 | { |
3133 | struct iovec inline_vecs[UIO_FASTIOV], *iovec = inline_vecs; | |
9adbd45d | 3134 | struct kiocb *kiocb = &req->rw.kiocb; |
2b188cc1 | 3135 | struct iov_iter iter; |
31b51510 | 3136 | size_t iov_count; |
fa15bafb PB |
3137 | ssize_t io_size, ret, ret2; |
3138 | unsigned long nr_segs; | |
2b188cc1 | 3139 | |
bcda7baa | 3140 | ret = io_import_iovec(READ, req, &iovec, &iter, !force_nonblock); |
06b76d44 JA |
3141 | if (ret < 0) |
3142 | return ret; | |
fa15bafb PB |
3143 | io_size = ret; |
3144 | req->result = io_size; | |
2b188cc1 | 3145 | |
fd6c2e4c JA |
3146 | /* Ensure we clear previously set non-block flag */ |
3147 | if (!force_nonblock) | |
29de5f6a | 3148 | kiocb->ki_flags &= ~IOCB_NOWAIT; |
fd6c2e4c | 3149 | |
24c74678 | 3150 | /* If the file doesn't support async, just async punt */ |
af197f50 | 3151 | if (force_nonblock && !io_file_supports_async(req->file, READ)) |
f67676d1 | 3152 | goto copy_iov; |
9e645e11 | 3153 | |
31b51510 | 3154 | iov_count = iov_iter_count(&iter); |
fa15bafb | 3155 | nr_segs = iter.nr_segs; |
9adbd45d | 3156 | ret = rw_verify_area(READ, req->file, &kiocb->ki_pos, iov_count); |
fa15bafb PB |
3157 | if (unlikely(ret)) |
3158 | goto out_free; | |
2b188cc1 | 3159 | |
fa15bafb | 3160 | ret2 = io_iter_do_read(req, &iter); |
32960613 | 3161 | |
fa15bafb PB |
3162 | /* Catch -EAGAIN return for forced non-blocking submission */ |
3163 | if (!force_nonblock || (ret2 != -EAGAIN && ret2 != -EIO)) { | |
3164 | kiocb_done(kiocb, ret2, cs); | |
3165 | } else { | |
3166 | iter.count = iov_count; | |
3167 | iter.nr_segs = nr_segs; | |
f67676d1 | 3168 | copy_iov: |
fa15bafb PB |
3169 | ret = io_setup_async_rw(req, io_size, iovec, inline_vecs, |
3170 | &iter); | |
3171 | if (ret) | |
3172 | goto out_free; | |
3173 | /* it's copied and will be cleaned with ->io */ | |
3174 | iovec = NULL; | |
3175 | /* if we can retry, do so with the callbacks armed */ | |
3176 | if (io_rw_should_retry(req)) { | |
3177 | ret2 = io_iter_do_read(req, &iter); | |
3178 | if (ret2 == -EIOCBQUEUED) { | |
f67676d1 | 3179 | goto out_free; |
fa15bafb PB |
3180 | } else if (ret2 != -EAGAIN) { |
3181 | kiocb_done(kiocb, ret2, cs); | |
f67676d1 | 3182 | goto out_free; |
bcf5a063 | 3183 | } |
f67676d1 | 3184 | } |
fa15bafb PB |
3185 | kiocb->ki_flags &= ~IOCB_WAITQ; |
3186 | return -EAGAIN; | |
2b188cc1 | 3187 | } |
f67676d1 | 3188 | out_free: |
252917c3 | 3189 | if (iovec) |
6f2cc166 | 3190 | kfree(iovec); |
2b188cc1 JA |
3191 | return ret; |
3192 | } | |
3193 | ||
3529d8c2 JA |
3194 | static int io_write_prep(struct io_kiocb *req, const struct io_uring_sqe *sqe, |
3195 | bool force_nonblock) | |
f67676d1 JA |
3196 | { |
3197 | ssize_t ret; | |
3198 | ||
3529d8c2 JA |
3199 | ret = io_prep_rw(req, sqe, force_nonblock); |
3200 | if (ret) | |
3201 | return ret; | |
f67676d1 | 3202 | |
3529d8c2 JA |
3203 | if (unlikely(!(req->file->f_mode & FMODE_WRITE))) |
3204 | return -EBADF; | |
f67676d1 | 3205 | |
5f798bea PB |
3206 | /* either don't need iovec imported or already have it */ |
3207 | if (!req->io || req->flags & REQ_F_NEED_CLEANUP) | |
3529d8c2 | 3208 | return 0; |
c3e330a4 | 3209 | return io_rw_prep_async(req, WRITE, force_nonblock); |
f67676d1 JA |
3210 | } |
3211 | ||
a1d7c393 JA |
3212 | static int io_write(struct io_kiocb *req, bool force_nonblock, |
3213 | struct io_comp_state *cs) | |
2b188cc1 JA |
3214 | { |
3215 | struct iovec inline_vecs[UIO_FASTIOV], *iovec = inline_vecs; | |
9adbd45d | 3216 | struct kiocb *kiocb = &req->rw.kiocb; |
2b188cc1 | 3217 | struct iov_iter iter; |
31b51510 | 3218 | size_t iov_count; |
fa15bafb PB |
3219 | ssize_t ret, ret2, io_size; |
3220 | unsigned long nr_segs; | |
2b188cc1 | 3221 | |
bcda7baa | 3222 | ret = io_import_iovec(WRITE, req, &iovec, &iter, !force_nonblock); |
06b76d44 JA |
3223 | if (ret < 0) |
3224 | return ret; | |
fa15bafb PB |
3225 | io_size = ret; |
3226 | req->result = io_size; | |
2b188cc1 | 3227 | |
fd6c2e4c JA |
3228 | /* Ensure we clear previously set non-block flag */ |
3229 | if (!force_nonblock) | |
9adbd45d | 3230 | req->rw.kiocb.ki_flags &= ~IOCB_NOWAIT; |
fd6c2e4c | 3231 | |
24c74678 | 3232 | /* If the file doesn't support async, just async punt */ |
af197f50 | 3233 | if (force_nonblock && !io_file_supports_async(req->file, WRITE)) |
f67676d1 | 3234 | goto copy_iov; |
31b51510 | 3235 | |
10d59345 JA |
3236 | /* file path doesn't support NOWAIT for non-direct_IO */ |
3237 | if (force_nonblock && !(kiocb->ki_flags & IOCB_DIRECT) && | |
3238 | (req->flags & REQ_F_ISREG)) | |
f67676d1 | 3239 | goto copy_iov; |
31b51510 | 3240 | |
f67676d1 | 3241 | iov_count = iov_iter_count(&iter); |
fa15bafb | 3242 | nr_segs = iter.nr_segs; |
9adbd45d | 3243 | ret = rw_verify_area(WRITE, req->file, &kiocb->ki_pos, iov_count); |
fa15bafb PB |
3244 | if (unlikely(ret)) |
3245 | goto out_free; | |
4ed734b0 | 3246 | |
fa15bafb PB |
3247 | /* |
3248 | * Open-code file_start_write here to grab freeze protection, | |
3249 | * which will be released by another thread in | |
3250 | * io_complete_rw(). Fool lockdep by telling it the lock got | |
3251 | * released so that it doesn't complain about the held lock when | |
3252 | * we return to userspace. | |
3253 | */ | |
3254 | if (req->flags & REQ_F_ISREG) { | |
3255 | __sb_start_write(file_inode(req->file)->i_sb, | |
3256 | SB_FREEZE_WRITE, true); | |
3257 | __sb_writers_release(file_inode(req->file)->i_sb, | |
3258 | SB_FREEZE_WRITE); | |
3259 | } | |
3260 | kiocb->ki_flags |= IOCB_WRITE; | |
4ed734b0 | 3261 | |
fa15bafb PB |
3262 | if (req->file->f_op->write_iter) |
3263 | ret2 = call_write_iter(req->file, kiocb, &iter); | |
2dd2111d | 3264 | else if (req->file->f_op->write) |
fa15bafb | 3265 | ret2 = loop_rw_iter(WRITE, req->file, kiocb, &iter); |
2dd2111d GH |
3266 | else |
3267 | ret2 = -EINVAL; | |
4ed734b0 | 3268 | |
fa15bafb PB |
3269 | /* |
3270 | * Raw bdev writes will return -EOPNOTSUPP for IOCB_NOWAIT. Just | |
3271 | * retry them without IOCB_NOWAIT. | |
3272 | */ | |
3273 | if (ret2 == -EOPNOTSUPP && (kiocb->ki_flags & IOCB_NOWAIT)) | |
3274 | ret2 = -EAGAIN; | |
3275 | if (!force_nonblock || ret2 != -EAGAIN) { | |
3276 | kiocb_done(kiocb, ret2, cs); | |
3277 | } else { | |
3278 | iter.count = iov_count; | |
3279 | iter.nr_segs = nr_segs; | |
f67676d1 | 3280 | copy_iov: |
fa15bafb PB |
3281 | ret = io_setup_async_rw(req, io_size, iovec, inline_vecs, |
3282 | &iter); | |
3283 | if (ret) | |
3284 | goto out_free; | |
3285 | /* it's copied and will be cleaned with ->io */ | |
3286 | iovec = NULL; | |
3287 | return -EAGAIN; | |
2b188cc1 | 3288 | } |
31b51510 | 3289 | out_free: |
252917c3 | 3290 | if (iovec) |
6f2cc166 | 3291 | kfree(iovec); |
2b188cc1 JA |
3292 | return ret; |
3293 | } | |
3294 | ||
f2a8d5c7 PB |
3295 | static int __io_splice_prep(struct io_kiocb *req, |
3296 | const struct io_uring_sqe *sqe) | |
7d67af2c PB |
3297 | { |
3298 | struct io_splice* sp = &req->splice; | |
3299 | unsigned int valid_flags = SPLICE_F_FD_IN_FIXED | SPLICE_F_ALL; | |
3300 | int ret; | |
3301 | ||
3302 | if (req->flags & REQ_F_NEED_CLEANUP) | |
3303 | return 0; | |
3232dd02 PB |
3304 | if (unlikely(req->ctx->flags & IORING_SETUP_IOPOLL)) |
3305 | return -EINVAL; | |
7d67af2c PB |
3306 | |
3307 | sp->file_in = NULL; | |
7d67af2c PB |
3308 | sp->len = READ_ONCE(sqe->len); |
3309 | sp->flags = READ_ONCE(sqe->splice_flags); | |
3310 | ||
3311 | if (unlikely(sp->flags & ~valid_flags)) | |
3312 | return -EINVAL; | |
3313 | ||
3314 | ret = io_file_get(NULL, req, READ_ONCE(sqe->splice_fd_in), &sp->file_in, | |
3315 | (sp->flags & SPLICE_F_FD_IN_FIXED)); | |
3316 | if (ret) | |
3317 | return ret; | |
3318 | req->flags |= REQ_F_NEED_CLEANUP; | |
3319 | ||
7cdaf587 XW |
3320 | if (!S_ISREG(file_inode(sp->file_in)->i_mode)) { |
3321 | /* | |
3322 | * Splice operation will be punted aync, and here need to | |
3323 | * modify io_wq_work.flags, so initialize io_wq_work firstly. | |
3324 | */ | |
3325 | io_req_init_async(req); | |
7d67af2c | 3326 | req->work.flags |= IO_WQ_WORK_UNBOUND; |
7cdaf587 | 3327 | } |
7d67af2c PB |
3328 | |
3329 | return 0; | |
3330 | } | |
3331 | ||
f2a8d5c7 PB |
3332 | static int io_tee_prep(struct io_kiocb *req, |
3333 | const struct io_uring_sqe *sqe) | |
3334 | { | |
3335 | if (READ_ONCE(sqe->splice_off_in) || READ_ONCE(sqe->off)) | |
3336 | return -EINVAL; | |
3337 | return __io_splice_prep(req, sqe); | |
3338 | } | |
3339 | ||
3340 | static int io_tee(struct io_kiocb *req, bool force_nonblock) | |
3341 | { | |
3342 | struct io_splice *sp = &req->splice; | |
3343 | struct file *in = sp->file_in; | |
3344 | struct file *out = sp->file_out; | |
3345 | unsigned int flags = sp->flags & ~SPLICE_F_FD_IN_FIXED; | |
3346 | long ret = 0; | |
3347 | ||
3348 | if (force_nonblock) | |
3349 | return -EAGAIN; | |
3350 | if (sp->len) | |
3351 | ret = do_tee(in, out, sp->len, flags); | |
3352 | ||
3353 | io_put_file(req, in, (sp->flags & SPLICE_F_FD_IN_FIXED)); | |
3354 | req->flags &= ~REQ_F_NEED_CLEANUP; | |
3355 | ||
f2a8d5c7 PB |
3356 | if (ret != sp->len) |
3357 | req_set_fail_links(req); | |
e1e16097 | 3358 | io_req_complete(req, ret); |
f2a8d5c7 PB |
3359 | return 0; |
3360 | } | |
3361 | ||
3362 | static int io_splice_prep(struct io_kiocb *req, const struct io_uring_sqe *sqe) | |
3363 | { | |
3364 | struct io_splice* sp = &req->splice; | |
3365 | ||
3366 | sp->off_in = READ_ONCE(sqe->splice_off_in); | |
3367 | sp->off_out = READ_ONCE(sqe->off); | |
3368 | return __io_splice_prep(req, sqe); | |
3369 | } | |
3370 | ||
014db007 | 3371 | static int io_splice(struct io_kiocb *req, bool force_nonblock) |
7d67af2c PB |
3372 | { |
3373 | struct io_splice *sp = &req->splice; | |
3374 | struct file *in = sp->file_in; | |
3375 | struct file *out = sp->file_out; | |
3376 | unsigned int flags = sp->flags & ~SPLICE_F_FD_IN_FIXED; | |
3377 | loff_t *poff_in, *poff_out; | |
c9687426 | 3378 | long ret = 0; |
7d67af2c | 3379 | |
2fb3e822 PB |
3380 | if (force_nonblock) |
3381 | return -EAGAIN; | |
7d67af2c PB |
3382 | |
3383 | poff_in = (sp->off_in == -1) ? NULL : &sp->off_in; | |
3384 | poff_out = (sp->off_out == -1) ? NULL : &sp->off_out; | |
c9687426 | 3385 | |
948a7749 | 3386 | if (sp->len) |
c9687426 | 3387 | ret = do_splice(in, poff_in, out, poff_out, sp->len, flags); |
7d67af2c PB |
3388 | |
3389 | io_put_file(req, in, (sp->flags & SPLICE_F_FD_IN_FIXED)); | |
3390 | req->flags &= ~REQ_F_NEED_CLEANUP; | |
3391 | ||
7d67af2c PB |
3392 | if (ret != sp->len) |
3393 | req_set_fail_links(req); | |
e1e16097 | 3394 | io_req_complete(req, ret); |
7d67af2c PB |
3395 | return 0; |
3396 | } | |
3397 | ||
2b188cc1 JA |
3398 | /* |
3399 | * IORING_OP_NOP just posts a completion event, nothing else. | |
3400 | */ | |
229a7b63 | 3401 | static int io_nop(struct io_kiocb *req, struct io_comp_state *cs) |
2b188cc1 JA |
3402 | { |
3403 | struct io_ring_ctx *ctx = req->ctx; | |
2b188cc1 | 3404 | |
def596e9 JA |
3405 | if (unlikely(ctx->flags & IORING_SETUP_IOPOLL)) |
3406 | return -EINVAL; | |
3407 | ||
229a7b63 | 3408 | __io_req_complete(req, 0, 0, cs); |
2b188cc1 JA |
3409 | return 0; |
3410 | } | |
3411 | ||
3529d8c2 | 3412 | static int io_prep_fsync(struct io_kiocb *req, const struct io_uring_sqe *sqe) |
c992fe29 | 3413 | { |
6b06314c | 3414 | struct io_ring_ctx *ctx = req->ctx; |
c992fe29 | 3415 | |
09bb8394 JA |
3416 | if (!req->file) |
3417 | return -EBADF; | |
c992fe29 | 3418 | |
6b06314c | 3419 | if (unlikely(ctx->flags & IORING_SETUP_IOPOLL)) |
def596e9 | 3420 | return -EINVAL; |
edafccee | 3421 | if (unlikely(sqe->addr || sqe->ioprio || sqe->buf_index)) |
c992fe29 CH |
3422 | return -EINVAL; |
3423 | ||
8ed8d3c3 JA |
3424 | req->sync.flags = READ_ONCE(sqe->fsync_flags); |
3425 | if (unlikely(req->sync.flags & ~IORING_FSYNC_DATASYNC)) | |
3426 | return -EINVAL; | |
3427 | ||
3428 | req->sync.off = READ_ONCE(sqe->off); | |
3429 | req->sync.len = READ_ONCE(sqe->len); | |
c992fe29 CH |
3430 | return 0; |
3431 | } | |
3432 | ||
ac45abc0 | 3433 | static int io_fsync(struct io_kiocb *req, bool force_nonblock) |
8ed8d3c3 | 3434 | { |
8ed8d3c3 | 3435 | loff_t end = req->sync.off + req->sync.len; |
8ed8d3c3 JA |
3436 | int ret; |
3437 | ||
ac45abc0 PB |
3438 | /* fsync always requires a blocking context */ |
3439 | if (force_nonblock) | |
3440 | return -EAGAIN; | |
3441 | ||
9adbd45d | 3442 | ret = vfs_fsync_range(req->file, req->sync.off, |
8ed8d3c3 JA |
3443 | end > 0 ? end : LLONG_MAX, |
3444 | req->sync.flags & IORING_FSYNC_DATASYNC); | |
3445 | if (ret < 0) | |
3446 | req_set_fail_links(req); | |
e1e16097 | 3447 | io_req_complete(req, ret); |
c992fe29 CH |
3448 | return 0; |
3449 | } | |
3450 | ||
d63d1b5e JA |
3451 | static int io_fallocate_prep(struct io_kiocb *req, |
3452 | const struct io_uring_sqe *sqe) | |
3453 | { | |
3454 | if (sqe->ioprio || sqe->buf_index || sqe->rw_flags) | |
3455 | return -EINVAL; | |
3232dd02 PB |
3456 | if (unlikely(req->ctx->flags & IORING_SETUP_IOPOLL)) |
3457 | return -EINVAL; | |
d63d1b5e JA |
3458 | |
3459 | req->sync.off = READ_ONCE(sqe->off); | |
3460 | req->sync.len = READ_ONCE(sqe->addr); | |
3461 | req->sync.mode = READ_ONCE(sqe->len); | |
3462 | return 0; | |
3463 | } | |
3464 | ||
014db007 | 3465 | static int io_fallocate(struct io_kiocb *req, bool force_nonblock) |
5d17b4a4 | 3466 | { |
ac45abc0 PB |
3467 | int ret; |
3468 | ||
d63d1b5e | 3469 | /* fallocate always requiring blocking context */ |
ac45abc0 | 3470 | if (force_nonblock) |
5d17b4a4 | 3471 | return -EAGAIN; |
ac45abc0 PB |
3472 | ret = vfs_fallocate(req->file, req->sync.mode, req->sync.off, |
3473 | req->sync.len); | |
ac45abc0 PB |
3474 | if (ret < 0) |
3475 | req_set_fail_links(req); | |
e1e16097 | 3476 | io_req_complete(req, ret); |
5d17b4a4 JA |
3477 | return 0; |
3478 | } | |
3479 | ||
ec65fea5 | 3480 | static int __io_openat_prep(struct io_kiocb *req, const struct io_uring_sqe *sqe) |
b7bb4f7d | 3481 | { |
f8748881 | 3482 | const char __user *fname; |
15b71abe | 3483 | int ret; |
b7bb4f7d | 3484 | |
3232dd02 | 3485 | if (unlikely(req->ctx->flags & (IORING_SETUP_IOPOLL|IORING_SETUP_SQPOLL))) |
15b71abe | 3486 | return -EINVAL; |
ec65fea5 | 3487 | if (unlikely(sqe->ioprio || sqe->buf_index)) |
15b71abe | 3488 | return -EINVAL; |
ec65fea5 | 3489 | if (unlikely(req->flags & REQ_F_FIXED_FILE)) |
cf3040ca | 3490 | return -EBADF; |
03b1230c | 3491 | |
ec65fea5 PB |
3492 | /* open.how should be already initialised */ |
3493 | if (!(req->open.how.flags & O_PATH) && force_o_largefile()) | |
08a1d26e | 3494 | req->open.how.flags |= O_LARGEFILE; |
3529d8c2 | 3495 | |
25e72d10 PB |
3496 | req->open.dfd = READ_ONCE(sqe->fd); |
3497 | fname = u64_to_user_ptr(READ_ONCE(sqe->addr)); | |
f8748881 | 3498 | req->open.filename = getname(fname); |
15b71abe JA |
3499 | if (IS_ERR(req->open.filename)) { |
3500 | ret = PTR_ERR(req->open.filename); | |
3501 | req->open.filename = NULL; | |
3502 | return ret; | |
3503 | } | |
4022e7af | 3504 | req->open.nofile = rlimit(RLIMIT_NOFILE); |
8fef80bf | 3505 | req->flags |= REQ_F_NEED_CLEANUP; |
15b71abe | 3506 | return 0; |
03b1230c JA |
3507 | } |
3508 | ||
ec65fea5 PB |
3509 | static int io_openat_prep(struct io_kiocb *req, const struct io_uring_sqe *sqe) |
3510 | { | |
3511 | u64 flags, mode; | |
3512 | ||
3513 | if (req->flags & REQ_F_NEED_CLEANUP) | |
3514 | return 0; | |
3515 | mode = READ_ONCE(sqe->len); | |
3516 | flags = READ_ONCE(sqe->open_flags); | |
3517 | req->open.how = build_open_how(flags, mode); | |
3518 | return __io_openat_prep(req, sqe); | |
3519 | } | |
3520 | ||
cebdb986 | 3521 | static int io_openat2_prep(struct io_kiocb *req, const struct io_uring_sqe *sqe) |
aa1fa28f | 3522 | { |
cebdb986 | 3523 | struct open_how __user *how; |
cebdb986 | 3524 | size_t len; |
0fa03c62 JA |
3525 | int ret; |
3526 | ||
0bdbdd08 PB |
3527 | if (req->flags & REQ_F_NEED_CLEANUP) |
3528 | return 0; | |
cebdb986 JA |
3529 | how = u64_to_user_ptr(READ_ONCE(sqe->addr2)); |
3530 | len = READ_ONCE(sqe->len); | |
cebdb986 JA |
3531 | if (len < OPEN_HOW_SIZE_VER0) |
3532 | return -EINVAL; | |
3529d8c2 | 3533 | |
cebdb986 JA |
3534 | ret = copy_struct_from_user(&req->open.how, sizeof(req->open.how), how, |
3535 | len); | |
3536 | if (ret) | |
3537 | return ret; | |
3529d8c2 | 3538 | |
ec65fea5 | 3539 | return __io_openat_prep(req, sqe); |
cebdb986 JA |
3540 | } |
3541 | ||
014db007 | 3542 | static int io_openat2(struct io_kiocb *req, bool force_nonblock) |
15b71abe JA |
3543 | { |
3544 | struct open_flags op; | |
15b71abe JA |
3545 | struct file *file; |
3546 | int ret; | |
3547 | ||
f86cd20c | 3548 | if (force_nonblock) |
15b71abe | 3549 | return -EAGAIN; |
15b71abe | 3550 | |
cebdb986 | 3551 | ret = build_open_flags(&req->open.how, &op); |
15b71abe JA |
3552 | if (ret) |
3553 | goto err; | |
3554 | ||
4022e7af | 3555 | ret = __get_unused_fd_flags(req->open.how.flags, req->open.nofile); |
15b71abe JA |
3556 | if (ret < 0) |
3557 | goto err; | |
3558 | ||
3559 | file = do_filp_open(req->open.dfd, req->open.filename, &op); | |
3560 | if (IS_ERR(file)) { | |
3561 | put_unused_fd(ret); | |
3562 | ret = PTR_ERR(file); | |
3563 | } else { | |
3564 | fsnotify_open(file); | |
3565 | fd_install(ret, file); | |
3566 | } | |
3567 | err: | |
3568 | putname(req->open.filename); | |
8fef80bf | 3569 | req->flags &= ~REQ_F_NEED_CLEANUP; |
15b71abe JA |
3570 | if (ret < 0) |
3571 | req_set_fail_links(req); | |
e1e16097 | 3572 | io_req_complete(req, ret); |
15b71abe JA |
3573 | return 0; |
3574 | } | |
3575 | ||
014db007 | 3576 | static int io_openat(struct io_kiocb *req, bool force_nonblock) |
cebdb986 | 3577 | { |
014db007 | 3578 | return io_openat2(req, force_nonblock); |
cebdb986 JA |
3579 | } |
3580 | ||
067524e9 JA |
3581 | static int io_remove_buffers_prep(struct io_kiocb *req, |
3582 | const struct io_uring_sqe *sqe) | |
3583 | { | |
3584 | struct io_provide_buf *p = &req->pbuf; | |
3585 | u64 tmp; | |
3586 | ||
3587 | if (sqe->ioprio || sqe->rw_flags || sqe->addr || sqe->len || sqe->off) | |
3588 | return -EINVAL; | |
3589 | ||
3590 | tmp = READ_ONCE(sqe->fd); | |
3591 | if (!tmp || tmp > USHRT_MAX) | |
3592 | return -EINVAL; | |
3593 | ||
3594 | memset(p, 0, sizeof(*p)); | |
3595 | p->nbufs = tmp; | |
3596 | p->bgid = READ_ONCE(sqe->buf_group); | |
3597 | return 0; | |
3598 | } | |
3599 | ||
3600 | static int __io_remove_buffers(struct io_ring_ctx *ctx, struct io_buffer *buf, | |
3601 | int bgid, unsigned nbufs) | |
3602 | { | |
3603 | unsigned i = 0; | |
3604 | ||
3605 | /* shouldn't happen */ | |
3606 | if (!nbufs) | |
3607 | return 0; | |
3608 | ||
3609 | /* the head kbuf is the list itself */ | |
3610 | while (!list_empty(&buf->list)) { | |
3611 | struct io_buffer *nxt; | |
3612 | ||
3613 | nxt = list_first_entry(&buf->list, struct io_buffer, list); | |
3614 | list_del(&nxt->list); | |
3615 | kfree(nxt); | |
3616 | if (++i == nbufs) | |
3617 | return i; | |
3618 | } | |
3619 | i++; | |
3620 | kfree(buf); | |
3621 | idr_remove(&ctx->io_buffer_idr, bgid); | |
3622 | ||
3623 | return i; | |
3624 | } | |
3625 | ||
229a7b63 JA |
3626 | static int io_remove_buffers(struct io_kiocb *req, bool force_nonblock, |
3627 | struct io_comp_state *cs) | |
067524e9 JA |
3628 | { |
3629 | struct io_provide_buf *p = &req->pbuf; | |
3630 | struct io_ring_ctx *ctx = req->ctx; | |
3631 | struct io_buffer *head; | |
3632 | int ret = 0; | |
3633 | ||
3634 | io_ring_submit_lock(ctx, !force_nonblock); | |
3635 | ||
3636 | lockdep_assert_held(&ctx->uring_lock); | |
3637 | ||
3638 | ret = -ENOENT; | |
3639 | head = idr_find(&ctx->io_buffer_idr, p->bgid); | |
3640 | if (head) | |
3641 | ret = __io_remove_buffers(ctx, head, p->bgid, p->nbufs); | |
3642 | ||
3643 | io_ring_submit_lock(ctx, !force_nonblock); | |
3644 | if (ret < 0) | |
3645 | req_set_fail_links(req); | |
229a7b63 | 3646 | __io_req_complete(req, ret, 0, cs); |
067524e9 JA |
3647 | return 0; |
3648 | } | |
3649 | ||
ddf0322d JA |
3650 | static int io_provide_buffers_prep(struct io_kiocb *req, |
3651 | const struct io_uring_sqe *sqe) | |
3652 | { | |
3653 | struct io_provide_buf *p = &req->pbuf; | |
3654 | u64 tmp; | |
3655 | ||
3656 | if (sqe->ioprio || sqe->rw_flags) | |
3657 | return -EINVAL; | |
3658 | ||
3659 | tmp = READ_ONCE(sqe->fd); | |
3660 | if (!tmp || tmp > USHRT_MAX) | |
3661 | return -E2BIG; | |
3662 | p->nbufs = tmp; | |
3663 | p->addr = READ_ONCE(sqe->addr); | |
3664 | p->len = READ_ONCE(sqe->len); | |
3665 | ||
efe68c1c | 3666 | if (!access_ok(u64_to_user_ptr(p->addr), (p->len * p->nbufs))) |
ddf0322d JA |
3667 | return -EFAULT; |
3668 | ||
3669 | p->bgid = READ_ONCE(sqe->buf_group); | |
3670 | tmp = READ_ONCE(sqe->off); | |
3671 | if (tmp > USHRT_MAX) | |
3672 | return -E2BIG; | |
3673 | p->bid = tmp; | |
3674 | return 0; | |
3675 | } | |
3676 | ||
3677 | static int io_add_buffers(struct io_provide_buf *pbuf, struct io_buffer **head) | |
3678 | { | |
3679 | struct io_buffer *buf; | |
3680 | u64 addr = pbuf->addr; | |
3681 | int i, bid = pbuf->bid; | |
3682 | ||
3683 | for (i = 0; i < pbuf->nbufs; i++) { | |
3684 | buf = kmalloc(sizeof(*buf), GFP_KERNEL); | |
3685 | if (!buf) | |
3686 | break; | |
3687 | ||
3688 | buf->addr = addr; | |
3689 | buf->len = pbuf->len; | |
3690 | buf->bid = bid; | |
3691 | addr += pbuf->len; | |
3692 | bid++; | |
3693 | if (!*head) { | |
3694 | INIT_LIST_HEAD(&buf->list); | |
3695 | *head = buf; | |
3696 | } else { | |
3697 | list_add_tail(&buf->list, &(*head)->list); | |
3698 | } | |
3699 | } | |
3700 | ||
3701 | return i ? i : -ENOMEM; | |
3702 | } | |
3703 | ||
229a7b63 JA |
3704 | static int io_provide_buffers(struct io_kiocb *req, bool force_nonblock, |
3705 | struct io_comp_state *cs) | |
ddf0322d JA |
3706 | { |
3707 | struct io_provide_buf *p = &req->pbuf; | |
3708 | struct io_ring_ctx *ctx = req->ctx; | |
3709 | struct io_buffer *head, *list; | |
3710 | int ret = 0; | |
3711 | ||
3712 | io_ring_submit_lock(ctx, !force_nonblock); | |
3713 | ||
3714 | lockdep_assert_held(&ctx->uring_lock); | |
3715 | ||
3716 | list = head = idr_find(&ctx->io_buffer_idr, p->bgid); | |
3717 | ||
3718 | ret = io_add_buffers(p, &head); | |
3719 | if (ret < 0) | |
3720 | goto out; | |
3721 | ||
3722 | if (!list) { | |
3723 | ret = idr_alloc(&ctx->io_buffer_idr, head, p->bgid, p->bgid + 1, | |
3724 | GFP_KERNEL); | |
3725 | if (ret < 0) { | |
067524e9 | 3726 | __io_remove_buffers(ctx, head, p->bgid, -1U); |
ddf0322d JA |
3727 | goto out; |
3728 | } | |
3729 | } | |
3730 | out: | |
3731 | io_ring_submit_unlock(ctx, !force_nonblock); | |
3732 | if (ret < 0) | |
3733 | req_set_fail_links(req); | |
229a7b63 | 3734 | __io_req_complete(req, ret, 0, cs); |
ddf0322d | 3735 | return 0; |
cebdb986 JA |
3736 | } |
3737 | ||
3e4827b0 JA |
3738 | static int io_epoll_ctl_prep(struct io_kiocb *req, |
3739 | const struct io_uring_sqe *sqe) | |
3740 | { | |
3741 | #if defined(CONFIG_EPOLL) | |
3742 | if (sqe->ioprio || sqe->buf_index) | |
3743 | return -EINVAL; | |
3232dd02 PB |
3744 | if (unlikely(req->ctx->flags & IORING_SETUP_IOPOLL)) |
3745 | return -EINVAL; | |
3e4827b0 JA |
3746 | |
3747 | req->epoll.epfd = READ_ONCE(sqe->fd); | |
3748 | req->epoll.op = READ_ONCE(sqe->len); | |
3749 | req->epoll.fd = READ_ONCE(sqe->off); | |
3750 | ||
3751 | if (ep_op_has_event(req->epoll.op)) { | |
3752 | struct epoll_event __user *ev; | |
3753 | ||
3754 | ev = u64_to_user_ptr(READ_ONCE(sqe->addr)); | |
3755 | if (copy_from_user(&req->epoll.event, ev, sizeof(*ev))) | |
3756 | return -EFAULT; | |
3757 | } | |
3758 | ||
3759 | return 0; | |
3760 | #else | |
3761 | return -EOPNOTSUPP; | |
3762 | #endif | |
3763 | } | |
3764 | ||
229a7b63 JA |
3765 | static int io_epoll_ctl(struct io_kiocb *req, bool force_nonblock, |
3766 | struct io_comp_state *cs) | |
3e4827b0 JA |
3767 | { |
3768 | #if defined(CONFIG_EPOLL) | |
3769 | struct io_epoll *ie = &req->epoll; | |
3770 | int ret; | |
3771 | ||
3772 | ret = do_epoll_ctl(ie->epfd, ie->op, ie->fd, &ie->event, force_nonblock); | |
3773 | if (force_nonblock && ret == -EAGAIN) | |
3774 | return -EAGAIN; | |
3775 | ||
3776 | if (ret < 0) | |
3777 | req_set_fail_links(req); | |
229a7b63 | 3778 | __io_req_complete(req, ret, 0, cs); |
3e4827b0 JA |
3779 | return 0; |
3780 | #else | |
3781 | return -EOPNOTSUPP; | |
3782 | #endif | |
3783 | } | |
3784 | ||
c1ca757b JA |
3785 | static int io_madvise_prep(struct io_kiocb *req, const struct io_uring_sqe *sqe) |
3786 | { | |
3787 | #if defined(CONFIG_ADVISE_SYSCALLS) && defined(CONFIG_MMU) | |
3788 | if (sqe->ioprio || sqe->buf_index || sqe->off) | |
3789 | return -EINVAL; | |
3232dd02 PB |
3790 | if (unlikely(req->ctx->flags & IORING_SETUP_IOPOLL)) |
3791 | return -EINVAL; | |
c1ca757b JA |
3792 | |
3793 | req->madvise.addr = READ_ONCE(sqe->addr); | |
3794 | req->madvise.len = READ_ONCE(sqe->len); | |
3795 | req->madvise.advice = READ_ONCE(sqe->fadvise_advice); | |
3796 | return 0; | |
3797 | #else | |
3798 | return -EOPNOTSUPP; | |
3799 | #endif | |
3800 | } | |
3801 | ||
014db007 | 3802 | static int io_madvise(struct io_kiocb *req, bool force_nonblock) |
c1ca757b JA |
3803 | { |
3804 | #if defined(CONFIG_ADVISE_SYSCALLS) && defined(CONFIG_MMU) | |
3805 | struct io_madvise *ma = &req->madvise; | |
3806 | int ret; | |
3807 | ||
3808 | if (force_nonblock) | |
3809 | return -EAGAIN; | |
3810 | ||
3811 | ret = do_madvise(ma->addr, ma->len, ma->advice); | |
3812 | if (ret < 0) | |
3813 | req_set_fail_links(req); | |
e1e16097 | 3814 | io_req_complete(req, ret); |
c1ca757b JA |
3815 | return 0; |
3816 | #else | |
3817 | return -EOPNOTSUPP; | |
3818 | #endif | |
3819 | } | |
3820 | ||
4840e418 JA |
3821 | static int io_fadvise_prep(struct io_kiocb *req, const struct io_uring_sqe *sqe) |
3822 | { | |
3823 | if (sqe->ioprio || sqe->buf_index || sqe->addr) | |
3824 | return -EINVAL; | |
3232dd02 PB |
3825 | if (unlikely(req->ctx->flags & IORING_SETUP_IOPOLL)) |
3826 | return -EINVAL; | |
4840e418 JA |
3827 | |
3828 | req->fadvise.offset = READ_ONCE(sqe->off); | |
3829 | req->fadvise.len = READ_ONCE(sqe->len); | |
3830 | req->fadvise.advice = READ_ONCE(sqe->fadvise_advice); | |
3831 | return 0; | |
3832 | } | |
3833 | ||
014db007 | 3834 | static int io_fadvise(struct io_kiocb *req, bool force_nonblock) |
4840e418 JA |
3835 | { |
3836 | struct io_fadvise *fa = &req->fadvise; | |
3837 | int ret; | |
3838 | ||
3e69426d JA |
3839 | if (force_nonblock) { |
3840 | switch (fa->advice) { | |
3841 | case POSIX_FADV_NORMAL: | |
3842 | case POSIX_FADV_RANDOM: | |
3843 | case POSIX_FADV_SEQUENTIAL: | |
3844 | break; | |
3845 | default: | |
3846 | return -EAGAIN; | |
3847 | } | |
3848 | } | |
4840e418 JA |
3849 | |
3850 | ret = vfs_fadvise(req->file, fa->offset, fa->len, fa->advice); | |
3851 | if (ret < 0) | |
3852 | req_set_fail_links(req); | |
e1e16097 | 3853 | io_req_complete(req, ret); |
4840e418 JA |
3854 | return 0; |
3855 | } | |
3856 | ||
eddc7ef5 JA |
3857 | static int io_statx_prep(struct io_kiocb *req, const struct io_uring_sqe *sqe) |
3858 | { | |
3232dd02 PB |
3859 | if (unlikely(req->ctx->flags & IORING_SETUP_IOPOLL)) |
3860 | return -EINVAL; | |
eddc7ef5 JA |
3861 | if (sqe->ioprio || sqe->buf_index) |
3862 | return -EINVAL; | |
9c280f90 | 3863 | if (req->flags & REQ_F_FIXED_FILE) |
cf3040ca | 3864 | return -EBADF; |
eddc7ef5 | 3865 | |
1d9e1288 BM |
3866 | req->statx.dfd = READ_ONCE(sqe->fd); |
3867 | req->statx.mask = READ_ONCE(sqe->len); | |
e62753e4 | 3868 | req->statx.filename = u64_to_user_ptr(READ_ONCE(sqe->addr)); |
1d9e1288 BM |
3869 | req->statx.buffer = u64_to_user_ptr(READ_ONCE(sqe->addr2)); |
3870 | req->statx.flags = READ_ONCE(sqe->statx_flags); | |
eddc7ef5 JA |
3871 | |
3872 | return 0; | |
3873 | } | |
3874 | ||
014db007 | 3875 | static int io_statx(struct io_kiocb *req, bool force_nonblock) |
eddc7ef5 | 3876 | { |
1d9e1288 | 3877 | struct io_statx *ctx = &req->statx; |
eddc7ef5 JA |
3878 | int ret; |
3879 | ||
5b0bbee4 JA |
3880 | if (force_nonblock) { |
3881 | /* only need file table for an actual valid fd */ | |
3882 | if (ctx->dfd == -1 || ctx->dfd == AT_FDCWD) | |
3883 | req->flags |= REQ_F_NO_FILE_TABLE; | |
eddc7ef5 | 3884 | return -EAGAIN; |
5b0bbee4 | 3885 | } |
eddc7ef5 | 3886 | |
e62753e4 BM |
3887 | ret = do_statx(ctx->dfd, ctx->filename, ctx->flags, ctx->mask, |
3888 | ctx->buffer); | |
eddc7ef5 | 3889 | |
eddc7ef5 JA |
3890 | if (ret < 0) |
3891 | req_set_fail_links(req); | |
e1e16097 | 3892 | io_req_complete(req, ret); |
eddc7ef5 JA |
3893 | return 0; |
3894 | } | |
3895 | ||
b5dba59e JA |
3896 | static int io_close_prep(struct io_kiocb *req, const struct io_uring_sqe *sqe) |
3897 | { | |
3898 | /* | |
3899 | * If we queue this for async, it must not be cancellable. That would | |
7cdaf587 XW |
3900 | * leave the 'file' in an undeterminate state, and here need to modify |
3901 | * io_wq_work.flags, so initialize io_wq_work firstly. | |
b5dba59e | 3902 | */ |
7cdaf587 | 3903 | io_req_init_async(req); |
b5dba59e JA |
3904 | req->work.flags |= IO_WQ_WORK_NO_CANCEL; |
3905 | ||
3232dd02 PB |
3906 | if (unlikely(req->ctx->flags & (IORING_SETUP_IOPOLL|IORING_SETUP_SQPOLL))) |
3907 | return -EINVAL; | |
b5dba59e JA |
3908 | if (sqe->ioprio || sqe->off || sqe->addr || sqe->len || |
3909 | sqe->rw_flags || sqe->buf_index) | |
3910 | return -EINVAL; | |
9c280f90 | 3911 | if (req->flags & REQ_F_FIXED_FILE) |
cf3040ca | 3912 | return -EBADF; |
b5dba59e JA |
3913 | |
3914 | req->close.fd = READ_ONCE(sqe->fd); | |
fd2206e4 JA |
3915 | if ((req->file && req->file->f_op == &io_uring_fops) || |
3916 | req->close.fd == req->ctx->ring_fd) | |
3917 | return -EBADF; | |
b5dba59e | 3918 | |
3af73b28 | 3919 | req->close.put_file = NULL; |
b5dba59e | 3920 | return 0; |
b5dba59e JA |
3921 | } |
3922 | ||
229a7b63 JA |
3923 | static int io_close(struct io_kiocb *req, bool force_nonblock, |
3924 | struct io_comp_state *cs) | |
b5dba59e | 3925 | { |
3af73b28 | 3926 | struct io_close *close = &req->close; |
b5dba59e JA |
3927 | int ret; |
3928 | ||
3af73b28 PB |
3929 | /* might be already done during nonblock submission */ |
3930 | if (!close->put_file) { | |
3931 | ret = __close_fd_get_file(close->fd, &close->put_file); | |
3932 | if (ret < 0) | |
3933 | return (ret == -ENOENT) ? -EBADF : ret; | |
3934 | } | |
b5dba59e JA |
3935 | |
3936 | /* if the file has a flush method, be safe and punt to async */ | |
3af73b28 | 3937 | if (close->put_file->f_op->flush && force_nonblock) { |
24c74678 PB |
3938 | /* was never set, but play safe */ |
3939 | req->flags &= ~REQ_F_NOWAIT; | |
0bf0eefd | 3940 | /* avoid grabbing files - we don't need the files */ |
24c74678 | 3941 | req->flags |= REQ_F_NO_FILE_TABLE; |
0bf0eefd | 3942 | return -EAGAIN; |
a2100672 | 3943 | } |
b5dba59e | 3944 | |
3af73b28 PB |
3945 | /* No ->flush() or already async, safely close from here */ |
3946 | ret = filp_close(close->put_file, req->work.files); | |
3947 | if (ret < 0) | |
3948 | req_set_fail_links(req); | |
3af73b28 PB |
3949 | fput(close->put_file); |
3950 | close->put_file = NULL; | |
229a7b63 | 3951 | __io_req_complete(req, ret, 0, cs); |
1a417f4e | 3952 | return 0; |
b5dba59e JA |
3953 | } |
3954 | ||
3529d8c2 | 3955 | static int io_prep_sfr(struct io_kiocb *req, const struct io_uring_sqe *sqe) |
5d17b4a4 JA |
3956 | { |
3957 | struct io_ring_ctx *ctx = req->ctx; | |
5d17b4a4 JA |
3958 | |
3959 | if (!req->file) | |
3960 | return -EBADF; | |
5d17b4a4 JA |
3961 | |
3962 | if (unlikely(ctx->flags & IORING_SETUP_IOPOLL)) | |
3963 | return -EINVAL; | |
3964 | if (unlikely(sqe->addr || sqe->ioprio || sqe->buf_index)) | |
3965 | return -EINVAL; | |
3966 | ||
8ed8d3c3 JA |
3967 | req->sync.off = READ_ONCE(sqe->off); |
3968 | req->sync.len = READ_ONCE(sqe->len); | |
3969 | req->sync.flags = READ_ONCE(sqe->sync_range_flags); | |
8ed8d3c3 JA |
3970 | return 0; |
3971 | } | |
3972 | ||
ac45abc0 | 3973 | static int io_sync_file_range(struct io_kiocb *req, bool force_nonblock) |
8ed8d3c3 | 3974 | { |
8ed8d3c3 JA |
3975 | int ret; |
3976 | ||
ac45abc0 PB |
3977 | /* sync_file_range always requires a blocking context */ |
3978 | if (force_nonblock) | |
3979 | return -EAGAIN; | |
3980 | ||
9adbd45d | 3981 | ret = sync_file_range(req->file, req->sync.off, req->sync.len, |
8ed8d3c3 JA |
3982 | req->sync.flags); |
3983 | if (ret < 0) | |
3984 | req_set_fail_links(req); | |
e1e16097 | 3985 | io_req_complete(req, ret); |
5d17b4a4 JA |
3986 | return 0; |
3987 | } | |
3988 | ||
469956e8 | 3989 | #if defined(CONFIG_NET) |
02d27d89 PB |
3990 | static int io_setup_async_msg(struct io_kiocb *req, |
3991 | struct io_async_msghdr *kmsg) | |
3992 | { | |
3993 | if (req->io) | |
3994 | return -EAGAIN; | |
3995 | if (io_alloc_async_ctx(req)) { | |
3996 | if (kmsg->iov != kmsg->fast_iov) | |
3997 | kfree(kmsg->iov); | |
3998 | return -ENOMEM; | |
3999 | } | |
4000 | req->flags |= REQ_F_NEED_CLEANUP; | |
4001 | memcpy(&req->io->msg, kmsg, sizeof(*kmsg)); | |
4002 | return -EAGAIN; | |
4003 | } | |
4004 | ||
2ae523ed PB |
4005 | static int io_sendmsg_copy_hdr(struct io_kiocb *req, |
4006 | struct io_async_msghdr *iomsg) | |
4007 | { | |
4008 | iomsg->iov = iomsg->fast_iov; | |
4009 | iomsg->msg.msg_name = &iomsg->addr; | |
4010 | return sendmsg_copy_msghdr(&iomsg->msg, req->sr_msg.umsg, | |
4011 | req->sr_msg.msg_flags, &iomsg->iov); | |
4012 | } | |
4013 | ||
3529d8c2 | 4014 | static int io_sendmsg_prep(struct io_kiocb *req, const struct io_uring_sqe *sqe) |
03b1230c | 4015 | { |
e47293fd | 4016 | struct io_sr_msg *sr = &req->sr_msg; |
3529d8c2 | 4017 | struct io_async_ctx *io = req->io; |
99bc4c38 | 4018 | int ret; |
03b1230c | 4019 | |
d2b6f48b PB |
4020 | if (unlikely(req->ctx->flags & IORING_SETUP_IOPOLL)) |
4021 | return -EINVAL; | |
4022 | ||
e47293fd | 4023 | sr->msg_flags = READ_ONCE(sqe->msg_flags); |
270a5940 | 4024 | sr->umsg = u64_to_user_ptr(READ_ONCE(sqe->addr)); |
fddaface | 4025 | sr->len = READ_ONCE(sqe->len); |
3529d8c2 | 4026 | |
d8768362 JA |
4027 | #ifdef CONFIG_COMPAT |
4028 | if (req->ctx->compat) | |
4029 | sr->msg_flags |= MSG_CMSG_COMPAT; | |
4030 | #endif | |
4031 | ||
fddaface | 4032 | if (!io || req->opcode == IORING_OP_SEND) |
3529d8c2 | 4033 | return 0; |
5f798bea PB |
4034 | /* iovec is already imported */ |
4035 | if (req->flags & REQ_F_NEED_CLEANUP) | |
4036 | return 0; | |
3529d8c2 | 4037 | |
2ae523ed | 4038 | ret = io_sendmsg_copy_hdr(req, &io->msg); |
99bc4c38 PB |
4039 | if (!ret) |
4040 | req->flags |= REQ_F_NEED_CLEANUP; | |
4041 | return ret; | |
03b1230c JA |
4042 | } |
4043 | ||
229a7b63 JA |
4044 | static int io_sendmsg(struct io_kiocb *req, bool force_nonblock, |
4045 | struct io_comp_state *cs) | |
aa1fa28f | 4046 | { |
6b754c8b | 4047 | struct io_async_msghdr iomsg, *kmsg; |
0fa03c62 | 4048 | struct socket *sock; |
7a7cacba | 4049 | unsigned flags; |
0fa03c62 JA |
4050 | int ret; |
4051 | ||
0fa03c62 | 4052 | sock = sock_from_file(req->file, &ret); |
7a7cacba PB |
4053 | if (unlikely(!sock)) |
4054 | return ret; | |
3529d8c2 | 4055 | |
7a7cacba PB |
4056 | if (req->io) { |
4057 | kmsg = &req->io->msg; | |
4058 | kmsg->msg.msg_name = &req->io->msg.addr; | |
4059 | /* if iov is set, it's allocated already */ | |
4060 | if (!kmsg->iov) | |
4061 | kmsg->iov = kmsg->fast_iov; | |
4062 | kmsg->msg.msg_iter.iov = kmsg->iov; | |
4063 | } else { | |
4064 | ret = io_sendmsg_copy_hdr(req, &iomsg); | |
4065 | if (ret) | |
4066 | return ret; | |
4067 | kmsg = &iomsg; | |
0fa03c62 | 4068 | } |
0fa03c62 | 4069 | |
7a7cacba PB |
4070 | flags = req->sr_msg.msg_flags; |
4071 | if (flags & MSG_DONTWAIT) | |
4072 | req->flags |= REQ_F_NOWAIT; | |
4073 | else if (force_nonblock) | |
4074 | flags |= MSG_DONTWAIT; | |
e47293fd | 4075 | |
7a7cacba PB |
4076 | ret = __sys_sendmsg_sock(sock, &kmsg->msg, flags); |
4077 | if (force_nonblock && ret == -EAGAIN) | |
4078 | return io_setup_async_msg(req, kmsg); | |
4079 | if (ret == -ERESTARTSYS) | |
4080 | ret = -EINTR; | |
0fa03c62 | 4081 | |
6b754c8b | 4082 | if (kmsg->iov != kmsg->fast_iov) |
0b416c3e | 4083 | kfree(kmsg->iov); |
99bc4c38 | 4084 | req->flags &= ~REQ_F_NEED_CLEANUP; |
4e88d6e7 JA |
4085 | if (ret < 0) |
4086 | req_set_fail_links(req); | |
229a7b63 | 4087 | __io_req_complete(req, ret, 0, cs); |
5d17b4a4 | 4088 | return 0; |
03b1230c | 4089 | } |
aa1fa28f | 4090 | |
229a7b63 JA |
4091 | static int io_send(struct io_kiocb *req, bool force_nonblock, |
4092 | struct io_comp_state *cs) | |
fddaface | 4093 | { |
7a7cacba PB |
4094 | struct io_sr_msg *sr = &req->sr_msg; |
4095 | struct msghdr msg; | |
4096 | struct iovec iov; | |
fddaface | 4097 | struct socket *sock; |
7a7cacba | 4098 | unsigned flags; |
fddaface JA |
4099 | int ret; |
4100 | ||
fddaface | 4101 | sock = sock_from_file(req->file, &ret); |
7a7cacba PB |
4102 | if (unlikely(!sock)) |
4103 | return ret; | |
fddaface | 4104 | |
7a7cacba PB |
4105 | ret = import_single_range(WRITE, sr->buf, sr->len, &iov, &msg.msg_iter); |
4106 | if (unlikely(ret)) | |
14c32eee | 4107 | return ret;; |
fddaface | 4108 | |
7a7cacba PB |
4109 | msg.msg_name = NULL; |
4110 | msg.msg_control = NULL; | |
4111 | msg.msg_controllen = 0; | |
4112 | msg.msg_namelen = 0; | |
fddaface | 4113 | |
7a7cacba PB |
4114 | flags = req->sr_msg.msg_flags; |
4115 | if (flags & MSG_DONTWAIT) | |
4116 | req->flags |= REQ_F_NOWAIT; | |
4117 | else if (force_nonblock) | |
4118 | flags |= MSG_DONTWAIT; | |
fddaface | 4119 | |
7a7cacba PB |
4120 | msg.msg_flags = flags; |
4121 | ret = sock_sendmsg(sock, &msg); | |
4122 | if (force_nonblock && ret == -EAGAIN) | |
4123 | return -EAGAIN; | |
4124 | if (ret == -ERESTARTSYS) | |
4125 | ret = -EINTR; | |
fddaface | 4126 | |
fddaface JA |
4127 | if (ret < 0) |
4128 | req_set_fail_links(req); | |
229a7b63 | 4129 | __io_req_complete(req, ret, 0, cs); |
fddaface | 4130 | return 0; |
fddaface JA |
4131 | } |
4132 | ||
1400e697 PB |
4133 | static int __io_recvmsg_copy_hdr(struct io_kiocb *req, |
4134 | struct io_async_msghdr *iomsg) | |
52de1fe1 JA |
4135 | { |
4136 | struct io_sr_msg *sr = &req->sr_msg; | |
4137 | struct iovec __user *uiov; | |
4138 | size_t iov_len; | |
4139 | int ret; | |
4140 | ||
1400e697 PB |
4141 | ret = __copy_msghdr_from_user(&iomsg->msg, sr->umsg, |
4142 | &iomsg->uaddr, &uiov, &iov_len); | |
52de1fe1 JA |
4143 | if (ret) |
4144 | return ret; | |
4145 | ||
4146 | if (req->flags & REQ_F_BUFFER_SELECT) { | |
4147 | if (iov_len > 1) | |
4148 | return -EINVAL; | |
1400e697 | 4149 | if (copy_from_user(iomsg->iov, uiov, sizeof(*uiov))) |
52de1fe1 | 4150 | return -EFAULT; |
1400e697 PB |
4151 | sr->len = iomsg->iov[0].iov_len; |
4152 | iov_iter_init(&iomsg->msg.msg_iter, READ, iomsg->iov, 1, | |
52de1fe1 | 4153 | sr->len); |
1400e697 | 4154 | iomsg->iov = NULL; |
52de1fe1 JA |
4155 | } else { |
4156 | ret = import_iovec(READ, uiov, iov_len, UIO_FASTIOV, | |
1400e697 | 4157 | &iomsg->iov, &iomsg->msg.msg_iter); |
52de1fe1 JA |
4158 | if (ret > 0) |
4159 | ret = 0; | |
4160 | } | |
4161 | ||
4162 | return ret; | |
4163 | } | |
4164 | ||
4165 | #ifdef CONFIG_COMPAT | |
4166 | static int __io_compat_recvmsg_copy_hdr(struct io_kiocb *req, | |
1400e697 | 4167 | struct io_async_msghdr *iomsg) |
52de1fe1 JA |
4168 | { |
4169 | struct compat_msghdr __user *msg_compat; | |
4170 | struct io_sr_msg *sr = &req->sr_msg; | |
4171 | struct compat_iovec __user *uiov; | |
4172 | compat_uptr_t ptr; | |
4173 | compat_size_t len; | |
4174 | int ret; | |
4175 | ||
270a5940 | 4176 | msg_compat = (struct compat_msghdr __user *) sr->umsg; |
1400e697 | 4177 | ret = __get_compat_msghdr(&iomsg->msg, msg_compat, &iomsg->uaddr, |
52de1fe1 JA |
4178 | &ptr, &len); |
4179 | if (ret) | |
4180 | return ret; | |
4181 | ||
4182 | uiov = compat_ptr(ptr); | |
4183 | if (req->flags & REQ_F_BUFFER_SELECT) { | |
4184 | compat_ssize_t clen; | |
4185 | ||
4186 | if (len > 1) | |
4187 | return -EINVAL; | |
4188 | if (!access_ok(uiov, sizeof(*uiov))) | |
4189 | return -EFAULT; | |
4190 | if (__get_user(clen, &uiov->iov_len)) | |
4191 | return -EFAULT; | |
4192 | if (clen < 0) | |
4193 | return -EINVAL; | |
1400e697 PB |
4194 | sr->len = iomsg->iov[0].iov_len; |
4195 | iomsg->iov = NULL; | |
52de1fe1 JA |
4196 | } else { |
4197 | ret = compat_import_iovec(READ, uiov, len, UIO_FASTIOV, | |
1400e697 PB |
4198 | &iomsg->iov, |
4199 | &iomsg->msg.msg_iter); | |
52de1fe1 JA |
4200 | if (ret < 0) |
4201 | return ret; | |
4202 | } | |
4203 | ||
4204 | return 0; | |
4205 | } | |
4206 | #endif | |
4207 | ||
1400e697 PB |
4208 | static int io_recvmsg_copy_hdr(struct io_kiocb *req, |
4209 | struct io_async_msghdr *iomsg) | |
52de1fe1 | 4210 | { |
1400e697 PB |
4211 | iomsg->msg.msg_name = &iomsg->addr; |
4212 | iomsg->iov = iomsg->fast_iov; | |
52de1fe1 JA |
4213 | |
4214 | #ifdef CONFIG_COMPAT | |
4215 | if (req->ctx->compat) | |
1400e697 | 4216 | return __io_compat_recvmsg_copy_hdr(req, iomsg); |
fddaface | 4217 | #endif |
52de1fe1 | 4218 | |
1400e697 | 4219 | return __io_recvmsg_copy_hdr(req, iomsg); |
52de1fe1 JA |
4220 | } |
4221 | ||
bcda7baa | 4222 | static struct io_buffer *io_recv_buffer_select(struct io_kiocb *req, |
7fbb1b54 | 4223 | bool needs_lock) |
bcda7baa JA |
4224 | { |
4225 | struct io_sr_msg *sr = &req->sr_msg; | |
4226 | struct io_buffer *kbuf; | |
4227 | ||
bcda7baa JA |
4228 | kbuf = io_buffer_select(req, &sr->len, sr->bgid, sr->kbuf, needs_lock); |
4229 | if (IS_ERR(kbuf)) | |
4230 | return kbuf; | |
4231 | ||
4232 | sr->kbuf = kbuf; | |
4233 | req->flags |= REQ_F_BUFFER_SELECTED; | |
bcda7baa | 4234 | return kbuf; |
fddaface JA |
4235 | } |
4236 | ||
7fbb1b54 PB |
4237 | static inline unsigned int io_put_recv_kbuf(struct io_kiocb *req) |
4238 | { | |
4239 | return io_put_kbuf(req, req->sr_msg.kbuf); | |
4240 | } | |
4241 | ||
3529d8c2 JA |
4242 | static int io_recvmsg_prep(struct io_kiocb *req, |
4243 | const struct io_uring_sqe *sqe) | |
aa1fa28f | 4244 | { |
e47293fd | 4245 | struct io_sr_msg *sr = &req->sr_msg; |
3529d8c2 | 4246 | struct io_async_ctx *io = req->io; |
99bc4c38 | 4247 | int ret; |
3529d8c2 | 4248 | |
d2b6f48b PB |
4249 | if (unlikely(req->ctx->flags & IORING_SETUP_IOPOLL)) |
4250 | return -EINVAL; | |
4251 | ||
3529d8c2 | 4252 | sr->msg_flags = READ_ONCE(sqe->msg_flags); |
270a5940 | 4253 | sr->umsg = u64_to_user_ptr(READ_ONCE(sqe->addr)); |
0b7b21e4 | 4254 | sr->len = READ_ONCE(sqe->len); |
bcda7baa | 4255 | sr->bgid = READ_ONCE(sqe->buf_group); |
06b76d44 | 4256 | |
d8768362 JA |
4257 | #ifdef CONFIG_COMPAT |
4258 | if (req->ctx->compat) | |
4259 | sr->msg_flags |= MSG_CMSG_COMPAT; | |
4260 | #endif | |
4261 | ||
fddaface | 4262 | if (!io || req->opcode == IORING_OP_RECV) |
06b76d44 | 4263 | return 0; |
5f798bea PB |
4264 | /* iovec is already imported */ |
4265 | if (req->flags & REQ_F_NEED_CLEANUP) | |
4266 | return 0; | |
03b1230c | 4267 | |
1400e697 | 4268 | ret = io_recvmsg_copy_hdr(req, &io->msg); |
99bc4c38 PB |
4269 | if (!ret) |
4270 | req->flags |= REQ_F_NEED_CLEANUP; | |
4271 | return ret; | |
aa1fa28f JA |
4272 | } |
4273 | ||
229a7b63 JA |
4274 | static int io_recvmsg(struct io_kiocb *req, bool force_nonblock, |
4275 | struct io_comp_state *cs) | |
aa1fa28f | 4276 | { |
6b754c8b | 4277 | struct io_async_msghdr iomsg, *kmsg; |
03b1230c | 4278 | struct socket *sock; |
7fbb1b54 | 4279 | struct io_buffer *kbuf; |
7a7cacba | 4280 | unsigned flags; |
52de1fe1 | 4281 | int ret, cflags = 0; |
03b1230c | 4282 | |
03b1230c | 4283 | sock = sock_from_file(req->file, &ret); |
7a7cacba PB |
4284 | if (unlikely(!sock)) |
4285 | return ret; | |
3529d8c2 | 4286 | |
7a7cacba PB |
4287 | if (req->io) { |
4288 | kmsg = &req->io->msg; | |
4289 | kmsg->msg.msg_name = &req->io->msg.addr; | |
4290 | /* if iov is set, it's allocated already */ | |
4291 | if (!kmsg->iov) | |
4292 | kmsg->iov = kmsg->fast_iov; | |
4293 | kmsg->msg.msg_iter.iov = kmsg->iov; | |
4294 | } else { | |
4295 | ret = io_recvmsg_copy_hdr(req, &iomsg); | |
4296 | if (ret) | |
681fda8d | 4297 | return ret; |
7a7cacba PB |
4298 | kmsg = &iomsg; |
4299 | } | |
03b1230c | 4300 | |
bc02ef33 | 4301 | if (req->flags & REQ_F_BUFFER_SELECT) { |
7fbb1b54 | 4302 | kbuf = io_recv_buffer_select(req, !force_nonblock); |
bc02ef33 | 4303 | if (IS_ERR(kbuf)) |
52de1fe1 | 4304 | return PTR_ERR(kbuf); |
7a7cacba PB |
4305 | kmsg->fast_iov[0].iov_base = u64_to_user_ptr(kbuf->addr); |
4306 | iov_iter_init(&kmsg->msg.msg_iter, READ, kmsg->iov, | |
4307 | 1, req->sr_msg.len); | |
4308 | } | |
52de1fe1 | 4309 | |
7a7cacba PB |
4310 | flags = req->sr_msg.msg_flags; |
4311 | if (flags & MSG_DONTWAIT) | |
4312 | req->flags |= REQ_F_NOWAIT; | |
4313 | else if (force_nonblock) | |
4314 | flags |= MSG_DONTWAIT; | |
e47293fd | 4315 | |
7a7cacba PB |
4316 | ret = __sys_recvmsg_sock(sock, &kmsg->msg, req->sr_msg.umsg, |
4317 | kmsg->uaddr, flags); | |
0e1b6fe3 PB |
4318 | if (force_nonblock && ret == -EAGAIN) |
4319 | return io_setup_async_msg(req, kmsg); | |
7a7cacba PB |
4320 | if (ret == -ERESTARTSYS) |
4321 | ret = -EINTR; | |
03b1230c | 4322 | |
7fbb1b54 PB |
4323 | if (req->flags & REQ_F_BUFFER_SELECTED) |
4324 | cflags = io_put_recv_kbuf(req); | |
6b754c8b | 4325 | if (kmsg->iov != kmsg->fast_iov) |
0b416c3e | 4326 | kfree(kmsg->iov); |
99bc4c38 | 4327 | req->flags &= ~REQ_F_NEED_CLEANUP; |
4e88d6e7 JA |
4328 | if (ret < 0) |
4329 | req_set_fail_links(req); | |
229a7b63 | 4330 | __io_req_complete(req, ret, cflags, cs); |
03b1230c | 4331 | return 0; |
0fa03c62 | 4332 | } |
5d17b4a4 | 4333 | |
229a7b63 JA |
4334 | static int io_recv(struct io_kiocb *req, bool force_nonblock, |
4335 | struct io_comp_state *cs) | |
fddaface | 4336 | { |
6b754c8b | 4337 | struct io_buffer *kbuf; |
7a7cacba PB |
4338 | struct io_sr_msg *sr = &req->sr_msg; |
4339 | struct msghdr msg; | |
4340 | void __user *buf = sr->buf; | |
fddaface | 4341 | struct socket *sock; |
7a7cacba PB |
4342 | struct iovec iov; |
4343 | unsigned flags; | |
bcda7baa | 4344 | int ret, cflags = 0; |
fddaface | 4345 | |
fddaface | 4346 | sock = sock_from_file(req->file, &ret); |
7a7cacba PB |
4347 | if (unlikely(!sock)) |
4348 | return ret; | |
fddaface | 4349 | |
bc02ef33 | 4350 | if (req->flags & REQ_F_BUFFER_SELECT) { |
7fbb1b54 | 4351 | kbuf = io_recv_buffer_select(req, !force_nonblock); |
bcda7baa JA |
4352 | if (IS_ERR(kbuf)) |
4353 | return PTR_ERR(kbuf); | |
7a7cacba | 4354 | buf = u64_to_user_ptr(kbuf->addr); |
bc02ef33 | 4355 | } |
bcda7baa | 4356 | |
7a7cacba | 4357 | ret = import_single_range(READ, buf, sr->len, &iov, &msg.msg_iter); |
14c32eee PB |
4358 | if (unlikely(ret)) |
4359 | goto out_free; | |
fddaface | 4360 | |
7a7cacba PB |
4361 | msg.msg_name = NULL; |
4362 | msg.msg_control = NULL; | |
4363 | msg.msg_controllen = 0; | |
4364 | msg.msg_namelen = 0; | |
4365 | msg.msg_iocb = NULL; | |
4366 | msg.msg_flags = 0; | |
fddaface | 4367 | |
7a7cacba PB |
4368 | flags = req->sr_msg.msg_flags; |
4369 | if (flags & MSG_DONTWAIT) | |
4370 | req->flags |= REQ_F_NOWAIT; | |
4371 | else if (force_nonblock) | |
4372 | flags |= MSG_DONTWAIT; | |
4373 | ||
4374 | ret = sock_recvmsg(sock, &msg, flags); | |
4375 | if (force_nonblock && ret == -EAGAIN) | |
4376 | return -EAGAIN; | |
4377 | if (ret == -ERESTARTSYS) | |
4378 | ret = -EINTR; | |
14c32eee | 4379 | out_free: |
7fbb1b54 PB |
4380 | if (req->flags & REQ_F_BUFFER_SELECTED) |
4381 | cflags = io_put_recv_kbuf(req); | |
fddaface JA |
4382 | if (ret < 0) |
4383 | req_set_fail_links(req); | |
229a7b63 | 4384 | __io_req_complete(req, ret, cflags, cs); |
fddaface | 4385 | return 0; |
fddaface JA |
4386 | } |
4387 | ||
3529d8c2 | 4388 | static int io_accept_prep(struct io_kiocb *req, const struct io_uring_sqe *sqe) |
17f2fe35 | 4389 | { |
8ed8d3c3 JA |
4390 | struct io_accept *accept = &req->accept; |
4391 | ||
17f2fe35 JA |
4392 | if (unlikely(req->ctx->flags & (IORING_SETUP_IOPOLL|IORING_SETUP_SQPOLL))) |
4393 | return -EINVAL; | |
8042d6ce | 4394 | if (sqe->ioprio || sqe->len || sqe->buf_index) |
17f2fe35 JA |
4395 | return -EINVAL; |
4396 | ||
d55e5f5b JA |
4397 | accept->addr = u64_to_user_ptr(READ_ONCE(sqe->addr)); |
4398 | accept->addr_len = u64_to_user_ptr(READ_ONCE(sqe->addr2)); | |
8ed8d3c3 | 4399 | accept->flags = READ_ONCE(sqe->accept_flags); |
09952e3e | 4400 | accept->nofile = rlimit(RLIMIT_NOFILE); |
8ed8d3c3 | 4401 | return 0; |
8ed8d3c3 | 4402 | } |
17f2fe35 | 4403 | |
229a7b63 JA |
4404 | static int io_accept(struct io_kiocb *req, bool force_nonblock, |
4405 | struct io_comp_state *cs) | |
8ed8d3c3 JA |
4406 | { |
4407 | struct io_accept *accept = &req->accept; | |
ac45abc0 | 4408 | unsigned int file_flags = force_nonblock ? O_NONBLOCK : 0; |
8ed8d3c3 JA |
4409 | int ret; |
4410 | ||
e697deed JX |
4411 | if (req->file->f_flags & O_NONBLOCK) |
4412 | req->flags |= REQ_F_NOWAIT; | |
4413 | ||
8ed8d3c3 | 4414 | ret = __sys_accept4_file(req->file, file_flags, accept->addr, |
09952e3e JA |
4415 | accept->addr_len, accept->flags, |
4416 | accept->nofile); | |
8ed8d3c3 | 4417 | if (ret == -EAGAIN && force_nonblock) |
17f2fe35 | 4418 | return -EAGAIN; |
ac45abc0 PB |
4419 | if (ret < 0) { |
4420 | if (ret == -ERESTARTSYS) | |
4421 | ret = -EINTR; | |
4e88d6e7 | 4422 | req_set_fail_links(req); |
ac45abc0 | 4423 | } |
229a7b63 | 4424 | __io_req_complete(req, ret, 0, cs); |
17f2fe35 | 4425 | return 0; |
8ed8d3c3 JA |
4426 | } |
4427 | ||
3529d8c2 | 4428 | static int io_connect_prep(struct io_kiocb *req, const struct io_uring_sqe *sqe) |
f499a021 | 4429 | { |
3529d8c2 JA |
4430 | struct io_connect *conn = &req->connect; |
4431 | struct io_async_ctx *io = req->io; | |
f499a021 | 4432 | |
3fbb51c1 JA |
4433 | if (unlikely(req->ctx->flags & (IORING_SETUP_IOPOLL|IORING_SETUP_SQPOLL))) |
4434 | return -EINVAL; | |
4435 | if (sqe->ioprio || sqe->len || sqe->buf_index || sqe->rw_flags) | |
4436 | return -EINVAL; | |
4437 | ||
3529d8c2 JA |
4438 | conn->addr = u64_to_user_ptr(READ_ONCE(sqe->addr)); |
4439 | conn->addr_len = READ_ONCE(sqe->addr2); | |
4440 | ||
4441 | if (!io) | |
4442 | return 0; | |
4443 | ||
4444 | return move_addr_to_kernel(conn->addr, conn->addr_len, | |
3fbb51c1 | 4445 | &io->connect.address); |
f499a021 JA |
4446 | } |
4447 | ||
229a7b63 JA |
4448 | static int io_connect(struct io_kiocb *req, bool force_nonblock, |
4449 | struct io_comp_state *cs) | |
f8e85cf2 | 4450 | { |
f499a021 | 4451 | struct io_async_ctx __io, *io; |
f8e85cf2 | 4452 | unsigned file_flags; |
3fbb51c1 | 4453 | int ret; |
f8e85cf2 | 4454 | |
f499a021 JA |
4455 | if (req->io) { |
4456 | io = req->io; | |
4457 | } else { | |
3529d8c2 JA |
4458 | ret = move_addr_to_kernel(req->connect.addr, |
4459 | req->connect.addr_len, | |
4460 | &__io.connect.address); | |
f499a021 JA |
4461 | if (ret) |
4462 | goto out; | |
4463 | io = &__io; | |
4464 | } | |
4465 | ||
3fbb51c1 JA |
4466 | file_flags = force_nonblock ? O_NONBLOCK : 0; |
4467 | ||
4468 | ret = __sys_connect_file(req->file, &io->connect.address, | |
4469 | req->connect.addr_len, file_flags); | |
87f80d62 | 4470 | if ((ret == -EAGAIN || ret == -EINPROGRESS) && force_nonblock) { |
b7bb4f7d JA |
4471 | if (req->io) |
4472 | return -EAGAIN; | |
4473 | if (io_alloc_async_ctx(req)) { | |
f499a021 JA |
4474 | ret = -ENOMEM; |
4475 | goto out; | |
4476 | } | |
b7bb4f7d | 4477 | memcpy(&req->io->connect, &__io.connect, sizeof(__io.connect)); |
f8e85cf2 | 4478 | return -EAGAIN; |
f499a021 | 4479 | } |
f8e85cf2 JA |
4480 | if (ret == -ERESTARTSYS) |
4481 | ret = -EINTR; | |
f499a021 | 4482 | out: |
4e88d6e7 JA |
4483 | if (ret < 0) |
4484 | req_set_fail_links(req); | |
229a7b63 | 4485 | __io_req_complete(req, ret, 0, cs); |
f8e85cf2 | 4486 | return 0; |
469956e8 Y |
4487 | } |
4488 | #else /* !CONFIG_NET */ | |
4489 | static int io_sendmsg_prep(struct io_kiocb *req, const struct io_uring_sqe *sqe) | |
4490 | { | |
f8e85cf2 | 4491 | return -EOPNOTSUPP; |
f8e85cf2 JA |
4492 | } |
4493 | ||
1e16c2f9 RD |
4494 | static int io_sendmsg(struct io_kiocb *req, bool force_nonblock, |
4495 | struct io_comp_state *cs) | |
469956e8 Y |
4496 | { |
4497 | return -EOPNOTSUPP; | |
4498 | } | |
4499 | ||
1e16c2f9 RD |
4500 | static int io_send(struct io_kiocb *req, bool force_nonblock, |
4501 | struct io_comp_state *cs) | |
469956e8 Y |
4502 | { |
4503 | return -EOPNOTSUPP; | |
4504 | } | |
4505 | ||
4506 | static int io_recvmsg_prep(struct io_kiocb *req, | |
4507 | const struct io_uring_sqe *sqe) | |
4508 | { | |
4509 | return -EOPNOTSUPP; | |
4510 | } | |
4511 | ||
1e16c2f9 RD |
4512 | static int io_recvmsg(struct io_kiocb *req, bool force_nonblock, |
4513 | struct io_comp_state *cs) | |
469956e8 Y |
4514 | { |
4515 | return -EOPNOTSUPP; | |
4516 | } | |
4517 | ||
1e16c2f9 RD |
4518 | static int io_recv(struct io_kiocb *req, bool force_nonblock, |
4519 | struct io_comp_state *cs) | |
469956e8 Y |
4520 | { |
4521 | return -EOPNOTSUPP; | |
4522 | } | |
4523 | ||
4524 | static int io_accept_prep(struct io_kiocb *req, const struct io_uring_sqe *sqe) | |
4525 | { | |
4526 | return -EOPNOTSUPP; | |
4527 | } | |
4528 | ||
1e16c2f9 RD |
4529 | static int io_accept(struct io_kiocb *req, bool force_nonblock, |
4530 | struct io_comp_state *cs) | |
469956e8 Y |
4531 | { |
4532 | return -EOPNOTSUPP; | |
4533 | } | |
ce593a6c | 4534 | |
469956e8 Y |
4535 | static int io_connect_prep(struct io_kiocb *req, const struct io_uring_sqe *sqe) |
4536 | { | |
4537 | return -EOPNOTSUPP; | |
4538 | } | |
4539 | ||
1e16c2f9 RD |
4540 | static int io_connect(struct io_kiocb *req, bool force_nonblock, |
4541 | struct io_comp_state *cs) | |
469956e8 | 4542 | { |
f8e85cf2 | 4543 | return -EOPNOTSUPP; |
ce593a6c | 4544 | } |
469956e8 | 4545 | #endif /* CONFIG_NET */ |
f8e85cf2 | 4546 | |
d7718a9d JA |
4547 | struct io_poll_table { |
4548 | struct poll_table_struct pt; | |
4549 | struct io_kiocb *req; | |
4550 | int error; | |
4551 | }; | |
ce593a6c | 4552 | |
d7718a9d JA |
4553 | static int __io_async_wake(struct io_kiocb *req, struct io_poll_iocb *poll, |
4554 | __poll_t mask, task_work_func_t func) | |
4555 | { | |
aa96bf8a | 4556 | int ret; |
d7718a9d JA |
4557 | |
4558 | /* for instances that support it check for an event match first: */ | |
4559 | if (mask && !(mask & poll->events)) | |
4560 | return 0; | |
4561 | ||
4562 | trace_io_uring_task_add(req->ctx, req->opcode, req->user_data, mask); | |
4563 | ||
4564 | list_del_init(&poll->wait.entry); | |
4565 | ||
d7718a9d JA |
4566 | req->result = mask; |
4567 | init_task_work(&req->task_work, func); | |
4568 | /* | |
e3aabf95 JA |
4569 | * If this fails, then the task is exiting. When a task exits, the |
4570 | * work gets canceled, so just cancel this request as well instead | |
4571 | * of executing it. We can't safely execute it anyway, as we may not | |
4572 | * have the needed state needed for it anyway. | |
d7718a9d | 4573 | */ |
b7db41c9 | 4574 | ret = io_req_task_work_add(req, &req->task_work); |
aa96bf8a | 4575 | if (unlikely(ret)) { |
c2c4c83c JA |
4576 | struct task_struct *tsk; |
4577 | ||
e3aabf95 | 4578 | WRITE_ONCE(poll->canceled, true); |
aa96bf8a | 4579 | tsk = io_wq_get_task(req->ctx->io_wq); |
ce593a6c JA |
4580 | task_work_add(tsk, &req->task_work, 0); |
4581 | wake_up_process(tsk); | |
aa96bf8a | 4582 | } |
d7718a9d JA |
4583 | return 1; |
4584 | } | |
4585 | ||
74ce6ce4 JA |
4586 | static bool io_poll_rewait(struct io_kiocb *req, struct io_poll_iocb *poll) |
4587 | __acquires(&req->ctx->completion_lock) | |
4588 | { | |
4589 | struct io_ring_ctx *ctx = req->ctx; | |
4590 | ||
4591 | if (!req->result && !READ_ONCE(poll->canceled)) { | |
4592 | struct poll_table_struct pt = { ._key = poll->events }; | |
4593 | ||
4594 | req->result = vfs_poll(req->file, &pt) & poll->events; | |
4595 | } | |
4596 | ||
4597 | spin_lock_irq(&ctx->completion_lock); | |
4598 | if (!req->result && !READ_ONCE(poll->canceled)) { | |
4599 | add_wait_queue(poll->head, &poll->wait); | |
4600 | return true; | |
4601 | } | |
4602 | ||
4603 | return false; | |
4604 | } | |
4605 | ||
807abcb0 | 4606 | static void io_poll_remove_double(struct io_kiocb *req, void *data) |
18bceab1 | 4607 | { |
807abcb0 | 4608 | struct io_poll_iocb *poll = data; |
18bceab1 JA |
4609 | |
4610 | lockdep_assert_held(&req->ctx->completion_lock); | |
4611 | ||
4612 | if (poll && poll->head) { | |
4613 | struct wait_queue_head *head = poll->head; | |
4614 | ||
4615 | spin_lock(&head->lock); | |
4616 | list_del_init(&poll->wait.entry); | |
4617 | if (poll->wait.private) | |
4618 | refcount_dec(&req->refs); | |
4619 | poll->head = NULL; | |
4620 | spin_unlock(&head->lock); | |
4621 | } | |
4622 | } | |
4623 | ||
4624 | static void io_poll_complete(struct io_kiocb *req, __poll_t mask, int error) | |
4625 | { | |
4626 | struct io_ring_ctx *ctx = req->ctx; | |
4627 | ||
807abcb0 | 4628 | io_poll_remove_double(req, req->io); |
18bceab1 JA |
4629 | req->poll.done = true; |
4630 | io_cqring_fill_event(req, error ? error : mangle_poll(mask)); | |
4631 | io_commit_cqring(ctx); | |
4632 | } | |
4633 | ||
4634 | static void io_poll_task_handler(struct io_kiocb *req, struct io_kiocb **nxt) | |
4635 | { | |
4636 | struct io_ring_ctx *ctx = req->ctx; | |
4637 | ||
4638 | if (io_poll_rewait(req, &req->poll)) { | |
4639 | spin_unlock_irq(&ctx->completion_lock); | |
4640 | return; | |
4641 | } | |
4642 | ||
4643 | hash_del(&req->hash_node); | |
4644 | io_poll_complete(req, req->result, 0); | |
4645 | req->flags |= REQ_F_COMP_LOCKED; | |
9b5f7bd9 | 4646 | *nxt = io_put_req_find_next(req); |
18bceab1 JA |
4647 | spin_unlock_irq(&ctx->completion_lock); |
4648 | ||
4649 | io_cqring_ev_posted(ctx); | |
4650 | } | |
4651 | ||
4652 | static void io_poll_task_func(struct callback_head *cb) | |
4653 | { | |
4654 | struct io_kiocb *req = container_of(cb, struct io_kiocb, task_work); | |
4655 | struct io_kiocb *nxt = NULL; | |
4656 | ||
4657 | io_poll_task_handler(req, &nxt); | |
ea1164e5 PB |
4658 | if (nxt) |
4659 | __io_req_task_submit(nxt); | |
18bceab1 JA |
4660 | } |
4661 | ||
4662 | static int io_poll_double_wake(struct wait_queue_entry *wait, unsigned mode, | |
4663 | int sync, void *key) | |
4664 | { | |
4665 | struct io_kiocb *req = wait->private; | |
807abcb0 | 4666 | struct io_poll_iocb *poll = req->apoll->double_poll; |
18bceab1 JA |
4667 | __poll_t mask = key_to_poll(key); |
4668 | ||
4669 | /* for instances that support it check for an event match first: */ | |
4670 | if (mask && !(mask & poll->events)) | |
4671 | return 0; | |
4672 | ||
807abcb0 | 4673 | if (poll && poll->head) { |
18bceab1 JA |
4674 | bool done; |
4675 | ||
807abcb0 JA |
4676 | spin_lock(&poll->head->lock); |
4677 | done = list_empty(&poll->wait.entry); | |
18bceab1 | 4678 | if (!done) |
807abcb0 JA |
4679 | list_del_init(&poll->wait.entry); |
4680 | spin_unlock(&poll->head->lock); | |
18bceab1 JA |
4681 | if (!done) |
4682 | __io_async_wake(req, poll, mask, io_poll_task_func); | |
4683 | } | |
4684 | refcount_dec(&req->refs); | |
4685 | return 1; | |
4686 | } | |
4687 | ||
4688 | static void io_init_poll_iocb(struct io_poll_iocb *poll, __poll_t events, | |
4689 | wait_queue_func_t wake_func) | |
4690 | { | |
4691 | poll->head = NULL; | |
4692 | poll->done = false; | |
4693 | poll->canceled = false; | |
4694 | poll->events = events; | |
4695 | INIT_LIST_HEAD(&poll->wait.entry); | |
4696 | init_waitqueue_func_entry(&poll->wait, wake_func); | |
4697 | } | |
4698 | ||
4699 | static void __io_queue_proc(struct io_poll_iocb *poll, struct io_poll_table *pt, | |
807abcb0 JA |
4700 | struct wait_queue_head *head, |
4701 | struct io_poll_iocb **poll_ptr) | |
18bceab1 JA |
4702 | { |
4703 | struct io_kiocb *req = pt->req; | |
4704 | ||
4705 | /* | |
4706 | * If poll->head is already set, it's because the file being polled | |
4707 | * uses multiple waitqueues for poll handling (eg one for read, one | |
4708 | * for write). Setup a separate io_poll_iocb if this happens. | |
4709 | */ | |
4710 | if (unlikely(poll->head)) { | |
4711 | /* already have a 2nd entry, fail a third attempt */ | |
807abcb0 | 4712 | if (*poll_ptr) { |
18bceab1 JA |
4713 | pt->error = -EINVAL; |
4714 | return; | |
4715 | } | |
4716 | poll = kmalloc(sizeof(*poll), GFP_ATOMIC); | |
4717 | if (!poll) { | |
4718 | pt->error = -ENOMEM; | |
4719 | return; | |
4720 | } | |
4721 | io_init_poll_iocb(poll, req->poll.events, io_poll_double_wake); | |
4722 | refcount_inc(&req->refs); | |
4723 | poll->wait.private = req; | |
807abcb0 | 4724 | *poll_ptr = poll; |
18bceab1 JA |
4725 | } |
4726 | ||
4727 | pt->error = 0; | |
4728 | poll->head = head; | |
a31eb4a2 JX |
4729 | |
4730 | if (poll->events & EPOLLEXCLUSIVE) | |
4731 | add_wait_queue_exclusive(head, &poll->wait); | |
4732 | else | |
4733 | add_wait_queue(head, &poll->wait); | |
18bceab1 JA |
4734 | } |
4735 | ||
4736 | static void io_async_queue_proc(struct file *file, struct wait_queue_head *head, | |
4737 | struct poll_table_struct *p) | |
4738 | { | |
4739 | struct io_poll_table *pt = container_of(p, struct io_poll_table, pt); | |
807abcb0 | 4740 | struct async_poll *apoll = pt->req->apoll; |
18bceab1 | 4741 | |
807abcb0 | 4742 | __io_queue_proc(&apoll->poll, pt, head, &apoll->double_poll); |
18bceab1 JA |
4743 | } |
4744 | ||
d7718a9d JA |
4745 | static void io_async_task_func(struct callback_head *cb) |
4746 | { | |
4747 | struct io_kiocb *req = container_of(cb, struct io_kiocb, task_work); | |
4748 | struct async_poll *apoll = req->apoll; | |
4749 | struct io_ring_ctx *ctx = req->ctx; | |
4750 | ||
4751 | trace_io_uring_task_run(req->ctx, req->opcode, req->user_data); | |
4752 | ||
74ce6ce4 | 4753 | if (io_poll_rewait(req, &apoll->poll)) { |
d7718a9d | 4754 | spin_unlock_irq(&ctx->completion_lock); |
74ce6ce4 | 4755 | return; |
d7718a9d JA |
4756 | } |
4757 | ||
31067255 | 4758 | /* If req is still hashed, it cannot have been canceled. Don't check. */ |
0be0b0e3 | 4759 | if (hash_hashed(&req->hash_node)) |
74ce6ce4 | 4760 | hash_del(&req->hash_node); |
2bae047e | 4761 | |
807abcb0 | 4762 | io_poll_remove_double(req, apoll->double_poll); |
74ce6ce4 JA |
4763 | spin_unlock_irq(&ctx->completion_lock); |
4764 | ||
0be0b0e3 PB |
4765 | if (!READ_ONCE(apoll->poll.canceled)) |
4766 | __io_req_task_submit(req); | |
4767 | else | |
4768 | __io_req_task_cancel(req, -ECANCELED); | |
aa340845 | 4769 | |
807abcb0 | 4770 | kfree(apoll->double_poll); |
31067255 | 4771 | kfree(apoll); |
d7718a9d JA |
4772 | } |
4773 | ||
4774 | static int io_async_wake(struct wait_queue_entry *wait, unsigned mode, int sync, | |
4775 | void *key) | |
4776 | { | |
4777 | struct io_kiocb *req = wait->private; | |
4778 | struct io_poll_iocb *poll = &req->apoll->poll; | |
4779 | ||
4780 | trace_io_uring_poll_wake(req->ctx, req->opcode, req->user_data, | |
4781 | key_to_poll(key)); | |
4782 | ||
4783 | return __io_async_wake(req, poll, key_to_poll(key), io_async_task_func); | |
4784 | } | |
4785 | ||
4786 | static void io_poll_req_insert(struct io_kiocb *req) | |
4787 | { | |
4788 | struct io_ring_ctx *ctx = req->ctx; | |
4789 | struct hlist_head *list; | |
4790 | ||
4791 | list = &ctx->cancel_hash[hash_long(req->user_data, ctx->cancel_hash_bits)]; | |
4792 | hlist_add_head(&req->hash_node, list); | |
4793 | } | |
4794 | ||
4795 | static __poll_t __io_arm_poll_handler(struct io_kiocb *req, | |
4796 | struct io_poll_iocb *poll, | |
4797 | struct io_poll_table *ipt, __poll_t mask, | |
4798 | wait_queue_func_t wake_func) | |
4799 | __acquires(&ctx->completion_lock) | |
4800 | { | |
4801 | struct io_ring_ctx *ctx = req->ctx; | |
4802 | bool cancel = false; | |
4803 | ||
18bceab1 | 4804 | io_init_poll_iocb(poll, mask, wake_func); |
b90cd197 | 4805 | poll->file = req->file; |
18bceab1 | 4806 | poll->wait.private = req; |
d7718a9d JA |
4807 | |
4808 | ipt->pt._key = mask; | |
4809 | ipt->req = req; | |
4810 | ipt->error = -EINVAL; | |
4811 | ||
d7718a9d JA |
4812 | mask = vfs_poll(req->file, &ipt->pt) & poll->events; |
4813 | ||
4814 | spin_lock_irq(&ctx->completion_lock); | |
4815 | if (likely(poll->head)) { | |
4816 | spin_lock(&poll->head->lock); | |
4817 | if (unlikely(list_empty(&poll->wait.entry))) { | |
4818 | if (ipt->error) | |
4819 | cancel = true; | |
4820 | ipt->error = 0; | |
4821 | mask = 0; | |
4822 | } | |
4823 | if (mask || ipt->error) | |
4824 | list_del_init(&poll->wait.entry); | |
4825 | else if (cancel) | |
4826 | WRITE_ONCE(poll->canceled, true); | |
4827 | else if (!poll->done) /* actually waiting for an event */ | |
4828 | io_poll_req_insert(req); | |
4829 | spin_unlock(&poll->head->lock); | |
4830 | } | |
4831 | ||
4832 | return mask; | |
4833 | } | |
4834 | ||
4835 | static bool io_arm_poll_handler(struct io_kiocb *req) | |
4836 | { | |
4837 | const struct io_op_def *def = &io_op_defs[req->opcode]; | |
4838 | struct io_ring_ctx *ctx = req->ctx; | |
4839 | struct async_poll *apoll; | |
4840 | struct io_poll_table ipt; | |
4841 | __poll_t mask, ret; | |
4842 | ||
4843 | if (!req->file || !file_can_poll(req->file)) | |
4844 | return false; | |
24c74678 | 4845 | if (req->flags & REQ_F_POLLED) |
d7718a9d JA |
4846 | return false; |
4847 | if (!def->pollin && !def->pollout) | |
4848 | return false; | |
4849 | ||
4850 | apoll = kmalloc(sizeof(*apoll), GFP_ATOMIC); | |
4851 | if (unlikely(!apoll)) | |
4852 | return false; | |
807abcb0 | 4853 | apoll->double_poll = NULL; |
d7718a9d JA |
4854 | |
4855 | req->flags |= REQ_F_POLLED; | |
4dd2824d | 4856 | io_get_req_task(req); |
d7718a9d JA |
4857 | req->apoll = apoll; |
4858 | INIT_HLIST_NODE(&req->hash_node); | |
4859 | ||
8755d97a | 4860 | mask = 0; |
d7718a9d | 4861 | if (def->pollin) |
8755d97a | 4862 | mask |= POLLIN | POLLRDNORM; |
d7718a9d JA |
4863 | if (def->pollout) |
4864 | mask |= POLLOUT | POLLWRNORM; | |
4865 | mask |= POLLERR | POLLPRI; | |
4866 | ||
4867 | ipt.pt._qproc = io_async_queue_proc; | |
4868 | ||
4869 | ret = __io_arm_poll_handler(req, &apoll->poll, &ipt, mask, | |
4870 | io_async_wake); | |
4871 | if (ret) { | |
807abcb0 | 4872 | io_poll_remove_double(req, apoll->double_poll); |
d7718a9d | 4873 | spin_unlock_irq(&ctx->completion_lock); |
807abcb0 | 4874 | kfree(apoll->double_poll); |
d7718a9d JA |
4875 | kfree(apoll); |
4876 | return false; | |
4877 | } | |
4878 | spin_unlock_irq(&ctx->completion_lock); | |
4879 | trace_io_uring_poll_arm(ctx, req->opcode, req->user_data, mask, | |
4880 | apoll->poll.events); | |
4881 | return true; | |
4882 | } | |
4883 | ||
4884 | static bool __io_poll_remove_one(struct io_kiocb *req, | |
4885 | struct io_poll_iocb *poll) | |
221c5eb2 | 4886 | { |
b41e9852 | 4887 | bool do_complete = false; |
221c5eb2 JA |
4888 | |
4889 | spin_lock(&poll->head->lock); | |
4890 | WRITE_ONCE(poll->canceled, true); | |
392edb45 JA |
4891 | if (!list_empty(&poll->wait.entry)) { |
4892 | list_del_init(&poll->wait.entry); | |
b41e9852 | 4893 | do_complete = true; |
221c5eb2 JA |
4894 | } |
4895 | spin_unlock(&poll->head->lock); | |
3bfa5bcb | 4896 | hash_del(&req->hash_node); |
d7718a9d JA |
4897 | return do_complete; |
4898 | } | |
4899 | ||
4900 | static bool io_poll_remove_one(struct io_kiocb *req) | |
4901 | { | |
4902 | bool do_complete; | |
4903 | ||
4904 | if (req->opcode == IORING_OP_POLL_ADD) { | |
807abcb0 | 4905 | io_poll_remove_double(req, req->io); |
d7718a9d JA |
4906 | do_complete = __io_poll_remove_one(req, &req->poll); |
4907 | } else { | |
3bfa5bcb JA |
4908 | struct async_poll *apoll = req->apoll; |
4909 | ||
807abcb0 JA |
4910 | io_poll_remove_double(req, apoll->double_poll); |
4911 | ||
d7718a9d | 4912 | /* non-poll requests have submit ref still */ |
3bfa5bcb JA |
4913 | do_complete = __io_poll_remove_one(req, &apoll->poll); |
4914 | if (do_complete) { | |
d7718a9d | 4915 | io_put_req(req); |
807abcb0 | 4916 | kfree(apoll->double_poll); |
3bfa5bcb JA |
4917 | kfree(apoll); |
4918 | } | |
b1f573bd XW |
4919 | } |
4920 | ||
b41e9852 JA |
4921 | if (do_complete) { |
4922 | io_cqring_fill_event(req, -ECANCELED); | |
4923 | io_commit_cqring(req->ctx); | |
4924 | req->flags |= REQ_F_COMP_LOCKED; | |
4925 | io_put_req(req); | |
4926 | } | |
4927 | ||
4928 | return do_complete; | |
221c5eb2 JA |
4929 | } |
4930 | ||
4931 | static void io_poll_remove_all(struct io_ring_ctx *ctx) | |
4932 | { | |
78076bb6 | 4933 | struct hlist_node *tmp; |
221c5eb2 | 4934 | struct io_kiocb *req; |
8e2e1faf | 4935 | int posted = 0, i; |
221c5eb2 JA |
4936 | |
4937 | spin_lock_irq(&ctx->completion_lock); | |
78076bb6 JA |
4938 | for (i = 0; i < (1U << ctx->cancel_hash_bits); i++) { |
4939 | struct hlist_head *list; | |
4940 | ||
4941 | list = &ctx->cancel_hash[i]; | |
4942 | hlist_for_each_entry_safe(req, tmp, list, hash_node) | |
8e2e1faf | 4943 | posted += io_poll_remove_one(req); |
221c5eb2 JA |
4944 | } |
4945 | spin_unlock_irq(&ctx->completion_lock); | |
b41e9852 | 4946 | |
8e2e1faf JA |
4947 | if (posted) |
4948 | io_cqring_ev_posted(ctx); | |
221c5eb2 JA |
4949 | } |
4950 | ||
47f46768 JA |
4951 | static int io_poll_cancel(struct io_ring_ctx *ctx, __u64 sqe_addr) |
4952 | { | |
78076bb6 | 4953 | struct hlist_head *list; |
47f46768 JA |
4954 | struct io_kiocb *req; |
4955 | ||
78076bb6 JA |
4956 | list = &ctx->cancel_hash[hash_long(sqe_addr, ctx->cancel_hash_bits)]; |
4957 | hlist_for_each_entry(req, list, hash_node) { | |
b41e9852 JA |
4958 | if (sqe_addr != req->user_data) |
4959 | continue; | |
4960 | if (io_poll_remove_one(req)) | |
eac406c6 | 4961 | return 0; |
b41e9852 | 4962 | return -EALREADY; |
47f46768 JA |
4963 | } |
4964 | ||
4965 | return -ENOENT; | |
4966 | } | |
4967 | ||
3529d8c2 JA |
4968 | static int io_poll_remove_prep(struct io_kiocb *req, |
4969 | const struct io_uring_sqe *sqe) | |
0969e783 | 4970 | { |
0969e783 JA |
4971 | if (unlikely(req->ctx->flags & IORING_SETUP_IOPOLL)) |
4972 | return -EINVAL; | |
4973 | if (sqe->ioprio || sqe->off || sqe->len || sqe->buf_index || | |
4974 | sqe->poll_events) | |
4975 | return -EINVAL; | |
4976 | ||
4977 | req->poll.addr = READ_ONCE(sqe->addr); | |
0969e783 JA |
4978 | return 0; |
4979 | } | |
4980 | ||
221c5eb2 JA |
4981 | /* |
4982 | * Find a running poll command that matches one specified in sqe->addr, | |
4983 | * and remove it if found. | |
4984 | */ | |
fc4df999 | 4985 | static int io_poll_remove(struct io_kiocb *req) |
221c5eb2 JA |
4986 | { |
4987 | struct io_ring_ctx *ctx = req->ctx; | |
0969e783 | 4988 | u64 addr; |
47f46768 | 4989 | int ret; |
221c5eb2 | 4990 | |
0969e783 | 4991 | addr = req->poll.addr; |
221c5eb2 | 4992 | spin_lock_irq(&ctx->completion_lock); |
0969e783 | 4993 | ret = io_poll_cancel(ctx, addr); |
221c5eb2 JA |
4994 | spin_unlock_irq(&ctx->completion_lock); |
4995 | ||
4e88d6e7 JA |
4996 | if (ret < 0) |
4997 | req_set_fail_links(req); | |
e1e16097 | 4998 | io_req_complete(req, ret); |
221c5eb2 JA |
4999 | return 0; |
5000 | } | |
5001 | ||
221c5eb2 JA |
5002 | static int io_poll_wake(struct wait_queue_entry *wait, unsigned mode, int sync, |
5003 | void *key) | |
5004 | { | |
c2f2eb7d JA |
5005 | struct io_kiocb *req = wait->private; |
5006 | struct io_poll_iocb *poll = &req->poll; | |
221c5eb2 | 5007 | |
d7718a9d | 5008 | return __io_async_wake(req, poll, key_to_poll(key), io_poll_task_func); |
221c5eb2 JA |
5009 | } |
5010 | ||
221c5eb2 JA |
5011 | static void io_poll_queue_proc(struct file *file, struct wait_queue_head *head, |
5012 | struct poll_table_struct *p) | |
5013 | { | |
5014 | struct io_poll_table *pt = container_of(p, struct io_poll_table, pt); | |
5015 | ||
807abcb0 | 5016 | __io_queue_proc(&pt->req->poll, pt, head, (struct io_poll_iocb **) &pt->req->io); |
eac406c6 JA |
5017 | } |
5018 | ||
3529d8c2 | 5019 | static int io_poll_add_prep(struct io_kiocb *req, const struct io_uring_sqe *sqe) |
221c5eb2 JA |
5020 | { |
5021 | struct io_poll_iocb *poll = &req->poll; | |
5769a351 | 5022 | u32 events; |
221c5eb2 JA |
5023 | |
5024 | if (unlikely(req->ctx->flags & IORING_SETUP_IOPOLL)) | |
5025 | return -EINVAL; | |
5026 | if (sqe->addr || sqe->ioprio || sqe->off || sqe->len || sqe->buf_index) | |
5027 | return -EINVAL; | |
09bb8394 JA |
5028 | if (!poll->file) |
5029 | return -EBADF; | |
221c5eb2 | 5030 | |
5769a351 JX |
5031 | events = READ_ONCE(sqe->poll32_events); |
5032 | #ifdef __BIG_ENDIAN | |
5033 | events = swahw32(events); | |
5034 | #endif | |
a31eb4a2 JX |
5035 | poll->events = demangle_poll(events) | EPOLLERR | EPOLLHUP | |
5036 | (events & EPOLLEXCLUSIVE); | |
b41e9852 | 5037 | |
4dd2824d | 5038 | io_get_req_task(req); |
0969e783 JA |
5039 | return 0; |
5040 | } | |
5041 | ||
014db007 | 5042 | static int io_poll_add(struct io_kiocb *req) |
0969e783 JA |
5043 | { |
5044 | struct io_poll_iocb *poll = &req->poll; | |
5045 | struct io_ring_ctx *ctx = req->ctx; | |
5046 | struct io_poll_table ipt; | |
0969e783 | 5047 | __poll_t mask; |
0969e783 | 5048 | |
78076bb6 | 5049 | INIT_HLIST_NODE(&req->hash_node); |
d7718a9d | 5050 | ipt.pt._qproc = io_poll_queue_proc; |
36703247 | 5051 | |
d7718a9d JA |
5052 | mask = __io_arm_poll_handler(req, &req->poll, &ipt, poll->events, |
5053 | io_poll_wake); | |
221c5eb2 | 5054 | |
8c838788 | 5055 | if (mask) { /* no async, we'd stolen it */ |
221c5eb2 | 5056 | ipt.error = 0; |
b0dd8a41 | 5057 | io_poll_complete(req, mask, 0); |
221c5eb2 | 5058 | } |
221c5eb2 JA |
5059 | spin_unlock_irq(&ctx->completion_lock); |
5060 | ||
8c838788 JA |
5061 | if (mask) { |
5062 | io_cqring_ev_posted(ctx); | |
014db007 | 5063 | io_put_req(req); |
221c5eb2 | 5064 | } |
8c838788 | 5065 | return ipt.error; |
221c5eb2 JA |
5066 | } |
5067 | ||
5262f567 JA |
5068 | static enum hrtimer_restart io_timeout_fn(struct hrtimer *timer) |
5069 | { | |
ad8a48ac JA |
5070 | struct io_timeout_data *data = container_of(timer, |
5071 | struct io_timeout_data, timer); | |
5072 | struct io_kiocb *req = data->req; | |
5073 | struct io_ring_ctx *ctx = req->ctx; | |
5262f567 JA |
5074 | unsigned long flags; |
5075 | ||
5262f567 | 5076 | spin_lock_irqsave(&ctx->completion_lock, flags); |
01cec8c1 PB |
5077 | atomic_set(&req->ctx->cq_timeouts, |
5078 | atomic_read(&req->ctx->cq_timeouts) + 1); | |
5079 | ||
ef03681a | 5080 | /* |
11365043 JA |
5081 | * We could be racing with timeout deletion. If the list is empty, |
5082 | * then timeout lookup already found it and will be handling it. | |
ef03681a | 5083 | */ |
135fcde8 PB |
5084 | if (!list_empty(&req->timeout.list)) |
5085 | list_del_init(&req->timeout.list); | |
5262f567 | 5086 | |
78e19bbe | 5087 | io_cqring_fill_event(req, -ETIME); |
5262f567 JA |
5088 | io_commit_cqring(ctx); |
5089 | spin_unlock_irqrestore(&ctx->completion_lock, flags); | |
5090 | ||
5091 | io_cqring_ev_posted(ctx); | |
4e88d6e7 | 5092 | req_set_fail_links(req); |
5262f567 JA |
5093 | io_put_req(req); |
5094 | return HRTIMER_NORESTART; | |
5095 | } | |
5096 | ||
47f46768 JA |
5097 | static int io_timeout_cancel(struct io_ring_ctx *ctx, __u64 user_data) |
5098 | { | |
5099 | struct io_kiocb *req; | |
5100 | int ret = -ENOENT; | |
5101 | ||
135fcde8 | 5102 | list_for_each_entry(req, &ctx->timeout_list, timeout.list) { |
47f46768 | 5103 | if (user_data == req->user_data) { |
135fcde8 | 5104 | list_del_init(&req->timeout.list); |
47f46768 JA |
5105 | ret = 0; |
5106 | break; | |
5107 | } | |
5108 | } | |
5109 | ||
5110 | if (ret == -ENOENT) | |
5111 | return ret; | |
5112 | ||
2d28390a | 5113 | ret = hrtimer_try_to_cancel(&req->io->timeout.timer); |
47f46768 JA |
5114 | if (ret == -1) |
5115 | return -EALREADY; | |
5116 | ||
4e88d6e7 | 5117 | req_set_fail_links(req); |
9b7adba9 | 5118 | req->flags |= REQ_F_COMP_LOCKED; |
47f46768 JA |
5119 | io_cqring_fill_event(req, -ECANCELED); |
5120 | io_put_req(req); | |
5121 | return 0; | |
5122 | } | |
5123 | ||
3529d8c2 JA |
5124 | static int io_timeout_remove_prep(struct io_kiocb *req, |
5125 | const struct io_uring_sqe *sqe) | |
b29472ee | 5126 | { |
b29472ee JA |
5127 | if (unlikely(req->ctx->flags & IORING_SETUP_IOPOLL)) |
5128 | return -EINVAL; | |
61710e43 DA |
5129 | if (unlikely(req->flags & (REQ_F_FIXED_FILE | REQ_F_BUFFER_SELECT))) |
5130 | return -EINVAL; | |
5131 | if (sqe->ioprio || sqe->buf_index || sqe->len) | |
b29472ee JA |
5132 | return -EINVAL; |
5133 | ||
5134 | req->timeout.addr = READ_ONCE(sqe->addr); | |
5135 | req->timeout.flags = READ_ONCE(sqe->timeout_flags); | |
5136 | if (req->timeout.flags) | |
5137 | return -EINVAL; | |
5138 | ||
b29472ee JA |
5139 | return 0; |
5140 | } | |
5141 | ||
11365043 JA |
5142 | /* |
5143 | * Remove or update an existing timeout command | |
5144 | */ | |
fc4df999 | 5145 | static int io_timeout_remove(struct io_kiocb *req) |
11365043 JA |
5146 | { |
5147 | struct io_ring_ctx *ctx = req->ctx; | |
47f46768 | 5148 | int ret; |
11365043 | 5149 | |
11365043 | 5150 | spin_lock_irq(&ctx->completion_lock); |
b29472ee | 5151 | ret = io_timeout_cancel(ctx, req->timeout.addr); |
11365043 | 5152 | |
47f46768 | 5153 | io_cqring_fill_event(req, ret); |
11365043 JA |
5154 | io_commit_cqring(ctx); |
5155 | spin_unlock_irq(&ctx->completion_lock); | |
5262f567 | 5156 | io_cqring_ev_posted(ctx); |
4e88d6e7 JA |
5157 | if (ret < 0) |
5158 | req_set_fail_links(req); | |
ec9c02ad | 5159 | io_put_req(req); |
11365043 | 5160 | return 0; |
5262f567 JA |
5161 | } |
5162 | ||
3529d8c2 | 5163 | static int io_timeout_prep(struct io_kiocb *req, const struct io_uring_sqe *sqe, |
2d28390a | 5164 | bool is_timeout_link) |
5262f567 | 5165 | { |
ad8a48ac | 5166 | struct io_timeout_data *data; |
a41525ab | 5167 | unsigned flags; |
56080b02 | 5168 | u32 off = READ_ONCE(sqe->off); |
5262f567 | 5169 | |
ad8a48ac | 5170 | if (unlikely(req->ctx->flags & IORING_SETUP_IOPOLL)) |
5262f567 | 5171 | return -EINVAL; |
ad8a48ac | 5172 | if (sqe->ioprio || sqe->buf_index || sqe->len != 1) |
a41525ab | 5173 | return -EINVAL; |
56080b02 | 5174 | if (off && is_timeout_link) |
2d28390a | 5175 | return -EINVAL; |
a41525ab JA |
5176 | flags = READ_ONCE(sqe->timeout_flags); |
5177 | if (flags & ~IORING_TIMEOUT_ABS) | |
5262f567 | 5178 | return -EINVAL; |
bdf20073 | 5179 | |
bfe68a22 | 5180 | req->timeout.off = off; |
26a61679 | 5181 | |
3529d8c2 | 5182 | if (!req->io && io_alloc_async_ctx(req)) |
26a61679 JA |
5183 | return -ENOMEM; |
5184 | ||
5185 | data = &req->io->timeout; | |
ad8a48ac | 5186 | data->req = req; |
ad8a48ac JA |
5187 | |
5188 | if (get_timespec64(&data->ts, u64_to_user_ptr(sqe->addr))) | |
5262f567 JA |
5189 | return -EFAULT; |
5190 | ||
11365043 | 5191 | if (flags & IORING_TIMEOUT_ABS) |
ad8a48ac | 5192 | data->mode = HRTIMER_MODE_ABS; |
11365043 | 5193 | else |
ad8a48ac | 5194 | data->mode = HRTIMER_MODE_REL; |
11365043 | 5195 | |
ad8a48ac JA |
5196 | hrtimer_init(&data->timer, CLOCK_MONOTONIC, data->mode); |
5197 | return 0; | |
5198 | } | |
5199 | ||
fc4df999 | 5200 | static int io_timeout(struct io_kiocb *req) |
ad8a48ac | 5201 | { |
ad8a48ac | 5202 | struct io_ring_ctx *ctx = req->ctx; |
bfe68a22 | 5203 | struct io_timeout_data *data = &req->io->timeout; |
ad8a48ac | 5204 | struct list_head *entry; |
bfe68a22 | 5205 | u32 tail, off = req->timeout.off; |
ad8a48ac | 5206 | |
733f5c95 | 5207 | spin_lock_irq(&ctx->completion_lock); |
93bd25bb | 5208 | |
5262f567 JA |
5209 | /* |
5210 | * sqe->off holds how many events that need to occur for this | |
93bd25bb JA |
5211 | * timeout event to be satisfied. If it isn't set, then this is |
5212 | * a pure timeout request, sequence isn't used. | |
5262f567 | 5213 | */ |
8eb7e2d0 | 5214 | if (io_is_timeout_noseq(req)) { |
93bd25bb JA |
5215 | entry = ctx->timeout_list.prev; |
5216 | goto add; | |
5217 | } | |
5262f567 | 5218 | |
bfe68a22 PB |
5219 | tail = ctx->cached_cq_tail - atomic_read(&ctx->cq_timeouts); |
5220 | req->timeout.target_seq = tail + off; | |
5262f567 JA |
5221 | |
5222 | /* | |
5223 | * Insertion sort, ensuring the first entry in the list is always | |
5224 | * the one we need first. | |
5225 | */ | |
5262f567 | 5226 | list_for_each_prev(entry, &ctx->timeout_list) { |
135fcde8 PB |
5227 | struct io_kiocb *nxt = list_entry(entry, struct io_kiocb, |
5228 | timeout.list); | |
5262f567 | 5229 | |
8eb7e2d0 | 5230 | if (io_is_timeout_noseq(nxt)) |
93bd25bb | 5231 | continue; |
bfe68a22 PB |
5232 | /* nxt.seq is behind @tail, otherwise would've been completed */ |
5233 | if (off >= nxt->timeout.target_seq - tail) | |
5262f567 JA |
5234 | break; |
5235 | } | |
93bd25bb | 5236 | add: |
135fcde8 | 5237 | list_add(&req->timeout.list, entry); |
ad8a48ac JA |
5238 | data->timer.function = io_timeout_fn; |
5239 | hrtimer_start(&data->timer, timespec64_to_ktime(data->ts), data->mode); | |
5262f567 | 5240 | spin_unlock_irq(&ctx->completion_lock); |
5262f567 JA |
5241 | return 0; |
5242 | } | |
5262f567 | 5243 | |
62755e35 JA |
5244 | static bool io_cancel_cb(struct io_wq_work *work, void *data) |
5245 | { | |
5246 | struct io_kiocb *req = container_of(work, struct io_kiocb, work); | |
5247 | ||
5248 | return req->user_data == (unsigned long) data; | |
5249 | } | |
5250 | ||
e977d6d3 | 5251 | static int io_async_cancel_one(struct io_ring_ctx *ctx, void *sqe_addr) |
62755e35 | 5252 | { |
62755e35 | 5253 | enum io_wq_cancel cancel_ret; |
62755e35 JA |
5254 | int ret = 0; |
5255 | ||
4f26bda1 | 5256 | cancel_ret = io_wq_cancel_cb(ctx->io_wq, io_cancel_cb, sqe_addr, false); |
62755e35 JA |
5257 | switch (cancel_ret) { |
5258 | case IO_WQ_CANCEL_OK: | |
5259 | ret = 0; | |
5260 | break; | |
5261 | case IO_WQ_CANCEL_RUNNING: | |
5262 | ret = -EALREADY; | |
5263 | break; | |
5264 | case IO_WQ_CANCEL_NOTFOUND: | |
5265 | ret = -ENOENT; | |
5266 | break; | |
5267 | } | |
5268 | ||
e977d6d3 JA |
5269 | return ret; |
5270 | } | |
5271 | ||
47f46768 JA |
5272 | static void io_async_find_and_cancel(struct io_ring_ctx *ctx, |
5273 | struct io_kiocb *req, __u64 sqe_addr, | |
014db007 | 5274 | int success_ret) |
47f46768 JA |
5275 | { |
5276 | unsigned long flags; | |
5277 | int ret; | |
5278 | ||
5279 | ret = io_async_cancel_one(ctx, (void *) (unsigned long) sqe_addr); | |
5280 | if (ret != -ENOENT) { | |
5281 | spin_lock_irqsave(&ctx->completion_lock, flags); | |
5282 | goto done; | |
5283 | } | |
5284 | ||
5285 | spin_lock_irqsave(&ctx->completion_lock, flags); | |
5286 | ret = io_timeout_cancel(ctx, sqe_addr); | |
5287 | if (ret != -ENOENT) | |
5288 | goto done; | |
5289 | ret = io_poll_cancel(ctx, sqe_addr); | |
5290 | done: | |
b0dd8a41 JA |
5291 | if (!ret) |
5292 | ret = success_ret; | |
47f46768 JA |
5293 | io_cqring_fill_event(req, ret); |
5294 | io_commit_cqring(ctx); | |
5295 | spin_unlock_irqrestore(&ctx->completion_lock, flags); | |
5296 | io_cqring_ev_posted(ctx); | |
5297 | ||
4e88d6e7 JA |
5298 | if (ret < 0) |
5299 | req_set_fail_links(req); | |
014db007 | 5300 | io_put_req(req); |
47f46768 JA |
5301 | } |
5302 | ||
3529d8c2 JA |
5303 | static int io_async_cancel_prep(struct io_kiocb *req, |
5304 | const struct io_uring_sqe *sqe) | |
e977d6d3 | 5305 | { |
fbf23849 | 5306 | if (unlikely(req->ctx->flags & IORING_SETUP_IOPOLL)) |
e977d6d3 | 5307 | return -EINVAL; |
61710e43 DA |
5308 | if (unlikely(req->flags & (REQ_F_FIXED_FILE | REQ_F_BUFFER_SELECT))) |
5309 | return -EINVAL; | |
5310 | if (sqe->ioprio || sqe->off || sqe->len || sqe->cancel_flags) | |
e977d6d3 JA |
5311 | return -EINVAL; |
5312 | ||
fbf23849 JA |
5313 | req->cancel.addr = READ_ONCE(sqe->addr); |
5314 | return 0; | |
5315 | } | |
5316 | ||
014db007 | 5317 | static int io_async_cancel(struct io_kiocb *req) |
fbf23849 JA |
5318 | { |
5319 | struct io_ring_ctx *ctx = req->ctx; | |
fbf23849 | 5320 | |
014db007 | 5321 | io_async_find_and_cancel(ctx, req, req->cancel.addr, 0); |
5262f567 JA |
5322 | return 0; |
5323 | } | |
5324 | ||
05f3fb3c JA |
5325 | static int io_files_update_prep(struct io_kiocb *req, |
5326 | const struct io_uring_sqe *sqe) | |
5327 | { | |
61710e43 DA |
5328 | if (unlikely(req->flags & (REQ_F_FIXED_FILE | REQ_F_BUFFER_SELECT))) |
5329 | return -EINVAL; | |
5330 | if (sqe->ioprio || sqe->rw_flags) | |
05f3fb3c JA |
5331 | return -EINVAL; |
5332 | ||
5333 | req->files_update.offset = READ_ONCE(sqe->off); | |
5334 | req->files_update.nr_args = READ_ONCE(sqe->len); | |
5335 | if (!req->files_update.nr_args) | |
5336 | return -EINVAL; | |
5337 | req->files_update.arg = READ_ONCE(sqe->addr); | |
5338 | return 0; | |
5339 | } | |
5340 | ||
229a7b63 JA |
5341 | static int io_files_update(struct io_kiocb *req, bool force_nonblock, |
5342 | struct io_comp_state *cs) | |
fbf23849 JA |
5343 | { |
5344 | struct io_ring_ctx *ctx = req->ctx; | |
05f3fb3c JA |
5345 | struct io_uring_files_update up; |
5346 | int ret; | |
fbf23849 | 5347 | |
f86cd20c | 5348 | if (force_nonblock) |
05f3fb3c | 5349 | return -EAGAIN; |
05f3fb3c JA |
5350 | |
5351 | up.offset = req->files_update.offset; | |
5352 | up.fds = req->files_update.arg; | |
5353 | ||
5354 | mutex_lock(&ctx->uring_lock); | |
5355 | ret = __io_sqe_files_update(ctx, &up, req->files_update.nr_args); | |
5356 | mutex_unlock(&ctx->uring_lock); | |
5357 | ||
5358 | if (ret < 0) | |
5359 | req_set_fail_links(req); | |
229a7b63 | 5360 | __io_req_complete(req, ret, 0, cs); |
5262f567 JA |
5361 | return 0; |
5362 | } | |
5363 | ||
3529d8c2 JA |
5364 | static int io_req_defer_prep(struct io_kiocb *req, |
5365 | const struct io_uring_sqe *sqe) | |
f67676d1 | 5366 | { |
e781573e | 5367 | ssize_t ret = 0; |
f67676d1 | 5368 | |
f1d96a8f PB |
5369 | if (!sqe) |
5370 | return 0; | |
5371 | ||
327d6d96 PB |
5372 | if (io_alloc_async_ctx(req)) |
5373 | return -EAGAIN; | |
f56040b8 PB |
5374 | ret = io_prep_work_files(req); |
5375 | if (unlikely(ret)) | |
5376 | return ret; | |
cccf0ee8 | 5377 | |
d625c6ee | 5378 | switch (req->opcode) { |
e781573e JA |
5379 | case IORING_OP_NOP: |
5380 | break; | |
f67676d1 JA |
5381 | case IORING_OP_READV: |
5382 | case IORING_OP_READ_FIXED: | |
3a6820f2 | 5383 | case IORING_OP_READ: |
3529d8c2 | 5384 | ret = io_read_prep(req, sqe, true); |
f67676d1 JA |
5385 | break; |
5386 | case IORING_OP_WRITEV: | |
5387 | case IORING_OP_WRITE_FIXED: | |
3a6820f2 | 5388 | case IORING_OP_WRITE: |
3529d8c2 | 5389 | ret = io_write_prep(req, sqe, true); |
f67676d1 | 5390 | break; |
0969e783 | 5391 | case IORING_OP_POLL_ADD: |
3529d8c2 | 5392 | ret = io_poll_add_prep(req, sqe); |
0969e783 JA |
5393 | break; |
5394 | case IORING_OP_POLL_REMOVE: | |
3529d8c2 | 5395 | ret = io_poll_remove_prep(req, sqe); |
0969e783 | 5396 | break; |
8ed8d3c3 | 5397 | case IORING_OP_FSYNC: |
3529d8c2 | 5398 | ret = io_prep_fsync(req, sqe); |
8ed8d3c3 JA |
5399 | break; |
5400 | case IORING_OP_SYNC_FILE_RANGE: | |
3529d8c2 | 5401 | ret = io_prep_sfr(req, sqe); |
8ed8d3c3 | 5402 | break; |
03b1230c | 5403 | case IORING_OP_SENDMSG: |
fddaface | 5404 | case IORING_OP_SEND: |
3529d8c2 | 5405 | ret = io_sendmsg_prep(req, sqe); |
03b1230c JA |
5406 | break; |
5407 | case IORING_OP_RECVMSG: | |
fddaface | 5408 | case IORING_OP_RECV: |
3529d8c2 | 5409 | ret = io_recvmsg_prep(req, sqe); |
03b1230c | 5410 | break; |
f499a021 | 5411 | case IORING_OP_CONNECT: |
3529d8c2 | 5412 | ret = io_connect_prep(req, sqe); |
f499a021 | 5413 | break; |
2d28390a | 5414 | case IORING_OP_TIMEOUT: |
3529d8c2 | 5415 | ret = io_timeout_prep(req, sqe, false); |
b7bb4f7d | 5416 | break; |
b29472ee | 5417 | case IORING_OP_TIMEOUT_REMOVE: |
3529d8c2 | 5418 | ret = io_timeout_remove_prep(req, sqe); |
b29472ee | 5419 | break; |
fbf23849 | 5420 | case IORING_OP_ASYNC_CANCEL: |
3529d8c2 | 5421 | ret = io_async_cancel_prep(req, sqe); |
fbf23849 | 5422 | break; |
2d28390a | 5423 | case IORING_OP_LINK_TIMEOUT: |
3529d8c2 | 5424 | ret = io_timeout_prep(req, sqe, true); |
b7bb4f7d | 5425 | break; |
8ed8d3c3 | 5426 | case IORING_OP_ACCEPT: |
3529d8c2 | 5427 | ret = io_accept_prep(req, sqe); |
8ed8d3c3 | 5428 | break; |
d63d1b5e JA |
5429 | case IORING_OP_FALLOCATE: |
5430 | ret = io_fallocate_prep(req, sqe); | |
5431 | break; | |
15b71abe JA |
5432 | case IORING_OP_OPENAT: |
5433 | ret = io_openat_prep(req, sqe); | |
5434 | break; | |
b5dba59e JA |
5435 | case IORING_OP_CLOSE: |
5436 | ret = io_close_prep(req, sqe); | |
5437 | break; | |
05f3fb3c JA |
5438 | case IORING_OP_FILES_UPDATE: |
5439 | ret = io_files_update_prep(req, sqe); | |
5440 | break; | |
eddc7ef5 JA |
5441 | case IORING_OP_STATX: |
5442 | ret = io_statx_prep(req, sqe); | |
5443 | break; | |
4840e418 JA |
5444 | case IORING_OP_FADVISE: |
5445 | ret = io_fadvise_prep(req, sqe); | |
5446 | break; | |
c1ca757b JA |
5447 | case IORING_OP_MADVISE: |
5448 | ret = io_madvise_prep(req, sqe); | |
5449 | break; | |
cebdb986 JA |
5450 | case IORING_OP_OPENAT2: |
5451 | ret = io_openat2_prep(req, sqe); | |
5452 | break; | |
3e4827b0 JA |
5453 | case IORING_OP_EPOLL_CTL: |
5454 | ret = io_epoll_ctl_prep(req, sqe); | |
5455 | break; | |
7d67af2c PB |
5456 | case IORING_OP_SPLICE: |
5457 | ret = io_splice_prep(req, sqe); | |
5458 | break; | |
ddf0322d JA |
5459 | case IORING_OP_PROVIDE_BUFFERS: |
5460 | ret = io_provide_buffers_prep(req, sqe); | |
5461 | break; | |
067524e9 JA |
5462 | case IORING_OP_REMOVE_BUFFERS: |
5463 | ret = io_remove_buffers_prep(req, sqe); | |
5464 | break; | |
f2a8d5c7 PB |
5465 | case IORING_OP_TEE: |
5466 | ret = io_tee_prep(req, sqe); | |
5467 | break; | |
f67676d1 | 5468 | default: |
e781573e JA |
5469 | printk_once(KERN_WARNING "io_uring: unhandled opcode %d\n", |
5470 | req->opcode); | |
5471 | ret = -EINVAL; | |
b7bb4f7d | 5472 | break; |
f67676d1 JA |
5473 | } |
5474 | ||
b7bb4f7d | 5475 | return ret; |
f67676d1 JA |
5476 | } |
5477 | ||
9cf7c104 PB |
5478 | static u32 io_get_sequence(struct io_kiocb *req) |
5479 | { | |
5480 | struct io_kiocb *pos; | |
5481 | struct io_ring_ctx *ctx = req->ctx; | |
5482 | u32 total_submitted, nr_reqs = 1; | |
5483 | ||
5484 | if (req->flags & REQ_F_LINK_HEAD) | |
5485 | list_for_each_entry(pos, &req->link_list, link_list) | |
5486 | nr_reqs++; | |
5487 | ||
5488 | total_submitted = ctx->cached_sq_head - ctx->cached_sq_dropped; | |
5489 | return total_submitted - nr_reqs; | |
5490 | } | |
5491 | ||
3529d8c2 | 5492 | static int io_req_defer(struct io_kiocb *req, const struct io_uring_sqe *sqe) |
de0617e4 | 5493 | { |
a197f664 | 5494 | struct io_ring_ctx *ctx = req->ctx; |
27dc8338 | 5495 | struct io_defer_entry *de; |
f67676d1 | 5496 | int ret; |
9cf7c104 | 5497 | u32 seq; |
de0617e4 | 5498 | |
9d858b21 | 5499 | /* Still need defer if there is pending req in defer list. */ |
9cf7c104 PB |
5500 | if (likely(list_empty_careful(&ctx->defer_list) && |
5501 | !(req->flags & REQ_F_IO_DRAIN))) | |
5502 | return 0; | |
5503 | ||
5504 | seq = io_get_sequence(req); | |
5505 | /* Still a chance to pass the sequence check */ | |
5506 | if (!req_need_defer(req, seq) && list_empty_careful(&ctx->defer_list)) | |
de0617e4 JA |
5507 | return 0; |
5508 | ||
650b5481 | 5509 | if (!req->io) { |
650b5481 | 5510 | ret = io_req_defer_prep(req, sqe); |
327d6d96 | 5511 | if (ret) |
650b5481 PB |
5512 | return ret; |
5513 | } | |
cbdcb435 | 5514 | io_prep_async_link(req); |
27dc8338 PB |
5515 | de = kmalloc(sizeof(*de), GFP_KERNEL); |
5516 | if (!de) | |
5517 | return -ENOMEM; | |
2d28390a | 5518 | |
de0617e4 | 5519 | spin_lock_irq(&ctx->completion_lock); |
9cf7c104 | 5520 | if (!req_need_defer(req, seq) && list_empty(&ctx->defer_list)) { |
de0617e4 | 5521 | spin_unlock_irq(&ctx->completion_lock); |
27dc8338 | 5522 | kfree(de); |
ae34817b PB |
5523 | io_queue_async_work(req); |
5524 | return -EIOCBQUEUED; | |
de0617e4 JA |
5525 | } |
5526 | ||
915967f6 | 5527 | trace_io_uring_defer(ctx, req, req->user_data); |
27dc8338 | 5528 | de->req = req; |
9cf7c104 | 5529 | de->seq = seq; |
27dc8338 | 5530 | list_add_tail(&de->list, &ctx->defer_list); |
de0617e4 JA |
5531 | spin_unlock_irq(&ctx->completion_lock); |
5532 | return -EIOCBQUEUED; | |
5533 | } | |
5534 | ||
3ca405eb | 5535 | static void __io_clean_op(struct io_kiocb *req) |
99bc4c38 PB |
5536 | { |
5537 | struct io_async_ctx *io = req->io; | |
5538 | ||
0e1b6fe3 PB |
5539 | if (req->flags & REQ_F_BUFFER_SELECTED) { |
5540 | switch (req->opcode) { | |
5541 | case IORING_OP_READV: | |
5542 | case IORING_OP_READ_FIXED: | |
5543 | case IORING_OP_READ: | |
bcda7baa | 5544 | kfree((void *)(unsigned long)req->rw.addr); |
0e1b6fe3 PB |
5545 | break; |
5546 | case IORING_OP_RECVMSG: | |
5547 | case IORING_OP_RECV: | |
bcda7baa | 5548 | kfree(req->sr_msg.kbuf); |
0e1b6fe3 PB |
5549 | break; |
5550 | } | |
5551 | req->flags &= ~REQ_F_BUFFER_SELECTED; | |
99bc4c38 PB |
5552 | } |
5553 | ||
0e1b6fe3 PB |
5554 | if (req->flags & REQ_F_NEED_CLEANUP) { |
5555 | switch (req->opcode) { | |
5556 | case IORING_OP_READV: | |
5557 | case IORING_OP_READ_FIXED: | |
5558 | case IORING_OP_READ: | |
5559 | case IORING_OP_WRITEV: | |
5560 | case IORING_OP_WRITE_FIXED: | |
5561 | case IORING_OP_WRITE: | |
5562 | if (io->rw.iov != io->rw.fast_iov) | |
5563 | kfree(io->rw.iov); | |
5564 | break; | |
5565 | case IORING_OP_RECVMSG: | |
5566 | case IORING_OP_SENDMSG: | |
5567 | if (io->msg.iov != io->msg.fast_iov) | |
5568 | kfree(io->msg.iov); | |
5569 | break; | |
5570 | case IORING_OP_SPLICE: | |
5571 | case IORING_OP_TEE: | |
5572 | io_put_file(req, req->splice.file_in, | |
5573 | (req->splice.flags & SPLICE_F_FD_IN_FIXED)); | |
5574 | break; | |
5575 | } | |
5576 | req->flags &= ~REQ_F_NEED_CLEANUP; | |
99bc4c38 | 5577 | } |
99bc4c38 PB |
5578 | } |
5579 | ||
3529d8c2 | 5580 | static int io_issue_sqe(struct io_kiocb *req, const struct io_uring_sqe *sqe, |
f13fad7b | 5581 | bool force_nonblock, struct io_comp_state *cs) |
2b188cc1 | 5582 | { |
a197f664 | 5583 | struct io_ring_ctx *ctx = req->ctx; |
d625c6ee | 5584 | int ret; |
2b188cc1 | 5585 | |
d625c6ee | 5586 | switch (req->opcode) { |
2b188cc1 | 5587 | case IORING_OP_NOP: |
229a7b63 | 5588 | ret = io_nop(req, cs); |
2b188cc1 JA |
5589 | break; |
5590 | case IORING_OP_READV: | |
edafccee | 5591 | case IORING_OP_READ_FIXED: |
3a6820f2 | 5592 | case IORING_OP_READ: |
3529d8c2 JA |
5593 | if (sqe) { |
5594 | ret = io_read_prep(req, sqe, force_nonblock); | |
5595 | if (ret < 0) | |
5596 | break; | |
5597 | } | |
a1d7c393 | 5598 | ret = io_read(req, force_nonblock, cs); |
edafccee | 5599 | break; |
3529d8c2 | 5600 | case IORING_OP_WRITEV: |
edafccee | 5601 | case IORING_OP_WRITE_FIXED: |
3a6820f2 | 5602 | case IORING_OP_WRITE: |
3529d8c2 JA |
5603 | if (sqe) { |
5604 | ret = io_write_prep(req, sqe, force_nonblock); | |
5605 | if (ret < 0) | |
5606 | break; | |
5607 | } | |
a1d7c393 | 5608 | ret = io_write(req, force_nonblock, cs); |
2b188cc1 | 5609 | break; |
c992fe29 | 5610 | case IORING_OP_FSYNC: |
3529d8c2 JA |
5611 | if (sqe) { |
5612 | ret = io_prep_fsync(req, sqe); | |
5613 | if (ret < 0) | |
5614 | break; | |
5615 | } | |
014db007 | 5616 | ret = io_fsync(req, force_nonblock); |
c992fe29 | 5617 | break; |
221c5eb2 | 5618 | case IORING_OP_POLL_ADD: |
3529d8c2 JA |
5619 | if (sqe) { |
5620 | ret = io_poll_add_prep(req, sqe); | |
5621 | if (ret) | |
5622 | break; | |
5623 | } | |
014db007 | 5624 | ret = io_poll_add(req); |
221c5eb2 JA |
5625 | break; |
5626 | case IORING_OP_POLL_REMOVE: | |
3529d8c2 JA |
5627 | if (sqe) { |
5628 | ret = io_poll_remove_prep(req, sqe); | |
5629 | if (ret < 0) | |
5630 | break; | |
5631 | } | |
fc4df999 | 5632 | ret = io_poll_remove(req); |
221c5eb2 | 5633 | break; |
5d17b4a4 | 5634 | case IORING_OP_SYNC_FILE_RANGE: |
3529d8c2 JA |
5635 | if (sqe) { |
5636 | ret = io_prep_sfr(req, sqe); | |
5637 | if (ret < 0) | |
5638 | break; | |
5639 | } | |
014db007 | 5640 | ret = io_sync_file_range(req, force_nonblock); |
5d17b4a4 | 5641 | break; |
0fa03c62 | 5642 | case IORING_OP_SENDMSG: |
fddaface | 5643 | case IORING_OP_SEND: |
3529d8c2 JA |
5644 | if (sqe) { |
5645 | ret = io_sendmsg_prep(req, sqe); | |
5646 | if (ret < 0) | |
5647 | break; | |
5648 | } | |
fddaface | 5649 | if (req->opcode == IORING_OP_SENDMSG) |
229a7b63 | 5650 | ret = io_sendmsg(req, force_nonblock, cs); |
fddaface | 5651 | else |
229a7b63 | 5652 | ret = io_send(req, force_nonblock, cs); |
0fa03c62 | 5653 | break; |
aa1fa28f | 5654 | case IORING_OP_RECVMSG: |
fddaface | 5655 | case IORING_OP_RECV: |
3529d8c2 JA |
5656 | if (sqe) { |
5657 | ret = io_recvmsg_prep(req, sqe); | |
5658 | if (ret) | |
5659 | break; | |
5660 | } | |
fddaface | 5661 | if (req->opcode == IORING_OP_RECVMSG) |
229a7b63 | 5662 | ret = io_recvmsg(req, force_nonblock, cs); |
fddaface | 5663 | else |
229a7b63 | 5664 | ret = io_recv(req, force_nonblock, cs); |
aa1fa28f | 5665 | break; |
5262f567 | 5666 | case IORING_OP_TIMEOUT: |
3529d8c2 JA |
5667 | if (sqe) { |
5668 | ret = io_timeout_prep(req, sqe, false); | |
5669 | if (ret) | |
5670 | break; | |
5671 | } | |
fc4df999 | 5672 | ret = io_timeout(req); |
5262f567 | 5673 | break; |
11365043 | 5674 | case IORING_OP_TIMEOUT_REMOVE: |
3529d8c2 JA |
5675 | if (sqe) { |
5676 | ret = io_timeout_remove_prep(req, sqe); | |
5677 | if (ret) | |
5678 | break; | |
5679 | } | |
fc4df999 | 5680 | ret = io_timeout_remove(req); |
11365043 | 5681 | break; |
17f2fe35 | 5682 | case IORING_OP_ACCEPT: |
3529d8c2 JA |
5683 | if (sqe) { |
5684 | ret = io_accept_prep(req, sqe); | |
5685 | if (ret) | |
5686 | break; | |
5687 | } | |
229a7b63 | 5688 | ret = io_accept(req, force_nonblock, cs); |
17f2fe35 | 5689 | break; |
f8e85cf2 | 5690 | case IORING_OP_CONNECT: |
3529d8c2 JA |
5691 | if (sqe) { |
5692 | ret = io_connect_prep(req, sqe); | |
5693 | if (ret) | |
5694 | break; | |
5695 | } | |
229a7b63 | 5696 | ret = io_connect(req, force_nonblock, cs); |
f8e85cf2 | 5697 | break; |
62755e35 | 5698 | case IORING_OP_ASYNC_CANCEL: |
3529d8c2 JA |
5699 | if (sqe) { |
5700 | ret = io_async_cancel_prep(req, sqe); | |
5701 | if (ret) | |
5702 | break; | |
5703 | } | |
014db007 | 5704 | ret = io_async_cancel(req); |
62755e35 | 5705 | break; |
d63d1b5e JA |
5706 | case IORING_OP_FALLOCATE: |
5707 | if (sqe) { | |
5708 | ret = io_fallocate_prep(req, sqe); | |
5709 | if (ret) | |
5710 | break; | |
5711 | } | |
014db007 | 5712 | ret = io_fallocate(req, force_nonblock); |
d63d1b5e | 5713 | break; |
15b71abe JA |
5714 | case IORING_OP_OPENAT: |
5715 | if (sqe) { | |
5716 | ret = io_openat_prep(req, sqe); | |
5717 | if (ret) | |
5718 | break; | |
5719 | } | |
014db007 | 5720 | ret = io_openat(req, force_nonblock); |
15b71abe | 5721 | break; |
b5dba59e JA |
5722 | case IORING_OP_CLOSE: |
5723 | if (sqe) { | |
5724 | ret = io_close_prep(req, sqe); | |
5725 | if (ret) | |
5726 | break; | |
5727 | } | |
229a7b63 | 5728 | ret = io_close(req, force_nonblock, cs); |
b5dba59e | 5729 | break; |
05f3fb3c JA |
5730 | case IORING_OP_FILES_UPDATE: |
5731 | if (sqe) { | |
5732 | ret = io_files_update_prep(req, sqe); | |
5733 | if (ret) | |
5734 | break; | |
5735 | } | |
229a7b63 | 5736 | ret = io_files_update(req, force_nonblock, cs); |
05f3fb3c | 5737 | break; |
eddc7ef5 JA |
5738 | case IORING_OP_STATX: |
5739 | if (sqe) { | |
5740 | ret = io_statx_prep(req, sqe); | |
5741 | if (ret) | |
5742 | break; | |
5743 | } | |
014db007 | 5744 | ret = io_statx(req, force_nonblock); |
eddc7ef5 | 5745 | break; |
4840e418 JA |
5746 | case IORING_OP_FADVISE: |
5747 | if (sqe) { | |
5748 | ret = io_fadvise_prep(req, sqe); | |
5749 | if (ret) | |
5750 | break; | |
5751 | } | |
014db007 | 5752 | ret = io_fadvise(req, force_nonblock); |
4840e418 | 5753 | break; |
c1ca757b JA |
5754 | case IORING_OP_MADVISE: |
5755 | if (sqe) { | |
5756 | ret = io_madvise_prep(req, sqe); | |
5757 | if (ret) | |
5758 | break; | |
5759 | } | |
014db007 | 5760 | ret = io_madvise(req, force_nonblock); |
c1ca757b | 5761 | break; |
cebdb986 JA |
5762 | case IORING_OP_OPENAT2: |
5763 | if (sqe) { | |
5764 | ret = io_openat2_prep(req, sqe); | |
5765 | if (ret) | |
5766 | break; | |
5767 | } | |
014db007 | 5768 | ret = io_openat2(req, force_nonblock); |
cebdb986 | 5769 | break; |
3e4827b0 JA |
5770 | case IORING_OP_EPOLL_CTL: |
5771 | if (sqe) { | |
5772 | ret = io_epoll_ctl_prep(req, sqe); | |
5773 | if (ret) | |
5774 | break; | |
5775 | } | |
229a7b63 | 5776 | ret = io_epoll_ctl(req, force_nonblock, cs); |
3e4827b0 | 5777 | break; |
7d67af2c PB |
5778 | case IORING_OP_SPLICE: |
5779 | if (sqe) { | |
5780 | ret = io_splice_prep(req, sqe); | |
5781 | if (ret < 0) | |
5782 | break; | |
5783 | } | |
014db007 | 5784 | ret = io_splice(req, force_nonblock); |
7d67af2c | 5785 | break; |
ddf0322d JA |
5786 | case IORING_OP_PROVIDE_BUFFERS: |
5787 | if (sqe) { | |
5788 | ret = io_provide_buffers_prep(req, sqe); | |
5789 | if (ret) | |
5790 | break; | |
5791 | } | |
229a7b63 | 5792 | ret = io_provide_buffers(req, force_nonblock, cs); |
ddf0322d | 5793 | break; |
067524e9 JA |
5794 | case IORING_OP_REMOVE_BUFFERS: |
5795 | if (sqe) { | |
5796 | ret = io_remove_buffers_prep(req, sqe); | |
5797 | if (ret) | |
5798 | break; | |
5799 | } | |
229a7b63 | 5800 | ret = io_remove_buffers(req, force_nonblock, cs); |
3e4827b0 | 5801 | break; |
f2a8d5c7 PB |
5802 | case IORING_OP_TEE: |
5803 | if (sqe) { | |
5804 | ret = io_tee_prep(req, sqe); | |
5805 | if (ret < 0) | |
5806 | break; | |
5807 | } | |
5808 | ret = io_tee(req, force_nonblock); | |
5809 | break; | |
2b188cc1 JA |
5810 | default: |
5811 | ret = -EINVAL; | |
5812 | break; | |
5813 | } | |
5814 | ||
def596e9 JA |
5815 | if (ret) |
5816 | return ret; | |
5817 | ||
b532576e JA |
5818 | /* If the op doesn't have a file, we're not polling for it */ |
5819 | if ((ctx->flags & IORING_SETUP_IOPOLL) && req->file) { | |
11ba820b JA |
5820 | const bool in_async = io_wq_current_is_worker(); |
5821 | ||
11ba820b JA |
5822 | /* workqueue context doesn't hold uring_lock, grab it now */ |
5823 | if (in_async) | |
5824 | mutex_lock(&ctx->uring_lock); | |
5825 | ||
def596e9 | 5826 | io_iopoll_req_issued(req); |
11ba820b JA |
5827 | |
5828 | if (in_async) | |
5829 | mutex_unlock(&ctx->uring_lock); | |
def596e9 JA |
5830 | } |
5831 | ||
5832 | return 0; | |
2b188cc1 JA |
5833 | } |
5834 | ||
f4db7182 | 5835 | static struct io_wq_work *io_wq_submit_work(struct io_wq_work *work) |
2b188cc1 JA |
5836 | { |
5837 | struct io_kiocb *req = container_of(work, struct io_kiocb, work); | |
6df1db6b | 5838 | struct io_kiocb *timeout; |
561fb04a | 5839 | int ret = 0; |
2b188cc1 | 5840 | |
6df1db6b PB |
5841 | timeout = io_prep_linked_timeout(req); |
5842 | if (timeout) | |
5843 | io_queue_linked_timeout(timeout); | |
d4c81f38 | 5844 | |
0c9d5ccd JA |
5845 | /* if NO_CANCEL is set, we must still run the work */ |
5846 | if ((work->flags & (IO_WQ_WORK_CANCEL|IO_WQ_WORK_NO_CANCEL)) == | |
5847 | IO_WQ_WORK_CANCEL) { | |
561fb04a | 5848 | ret = -ECANCELED; |
0c9d5ccd | 5849 | } |
31b51510 | 5850 | |
561fb04a | 5851 | if (!ret) { |
561fb04a | 5852 | do { |
f13fad7b | 5853 | ret = io_issue_sqe(req, NULL, false, NULL); |
561fb04a JA |
5854 | /* |
5855 | * We can get EAGAIN for polled IO even though we're | |
5856 | * forcing a sync submission from here, since we can't | |
5857 | * wait for request slots on the block side. | |
5858 | */ | |
5859 | if (ret != -EAGAIN) | |
5860 | break; | |
5861 | cond_resched(); | |
5862 | } while (1); | |
5863 | } | |
31b51510 | 5864 | |
561fb04a | 5865 | if (ret) { |
4e88d6e7 | 5866 | req_set_fail_links(req); |
e1e16097 | 5867 | io_req_complete(req, ret); |
edafccee | 5868 | } |
2b188cc1 | 5869 | |
f4db7182 | 5870 | return io_steal_work(req); |
2b188cc1 JA |
5871 | } |
5872 | ||
65e19f54 JA |
5873 | static inline struct file *io_file_from_index(struct io_ring_ctx *ctx, |
5874 | int index) | |
5875 | { | |
5876 | struct fixed_file_table *table; | |
5877 | ||
05f3fb3c | 5878 | table = &ctx->file_data->table[index >> IORING_FILE_TABLE_SHIFT]; |
84695089 | 5879 | return table->files[index & IORING_FILE_TABLE_MASK]; |
65e19f54 JA |
5880 | } |
5881 | ||
8da11c19 PB |
5882 | static int io_file_get(struct io_submit_state *state, struct io_kiocb *req, |
5883 | int fd, struct file **out_file, bool fixed) | |
09bb8394 | 5884 | { |
a197f664 | 5885 | struct io_ring_ctx *ctx = req->ctx; |
8da11c19 | 5886 | struct file *file; |
09bb8394 | 5887 | |
8da11c19 | 5888 | if (fixed) { |
05f3fb3c | 5889 | if (unlikely(!ctx->file_data || |
09bb8394 JA |
5890 | (unsigned) fd >= ctx->nr_user_files)) |
5891 | return -EBADF; | |
b7620121 | 5892 | fd = array_index_nospec(fd, ctx->nr_user_files); |
8da11c19 | 5893 | file = io_file_from_index(ctx, fd); |
fd2206e4 JA |
5894 | if (file) { |
5895 | req->fixed_file_refs = ctx->file_data->cur_refs; | |
5896 | percpu_ref_get(req->fixed_file_refs); | |
5897 | } | |
09bb8394 | 5898 | } else { |
c826bd7a | 5899 | trace_io_uring_file_get(ctx, fd); |
8da11c19 | 5900 | file = __io_file_get(state, fd); |
09bb8394 JA |
5901 | } |
5902 | ||
fd2206e4 JA |
5903 | if (file || io_op_defs[req->opcode].needs_file_no_error) { |
5904 | *out_file = file; | |
5905 | return 0; | |
5906 | } | |
5907 | return -EBADF; | |
09bb8394 JA |
5908 | } |
5909 | ||
8da11c19 | 5910 | static int io_req_set_file(struct io_submit_state *state, struct io_kiocb *req, |
63ff8223 | 5911 | int fd) |
8da11c19 | 5912 | { |
8da11c19 PB |
5913 | bool fixed; |
5914 | ||
63ff8223 | 5915 | fixed = (req->flags & REQ_F_FIXED_FILE) != 0; |
0cdaf760 | 5916 | if (unlikely(!fixed && io_async_submit(req->ctx))) |
8da11c19 PB |
5917 | return -EBADF; |
5918 | ||
5919 | return io_file_get(state, req, fd, &req->file, fixed); | |
5920 | } | |
5921 | ||
a197f664 | 5922 | static int io_grab_files(struct io_kiocb *req) |
fcb323cc JA |
5923 | { |
5924 | int ret = -EBADF; | |
a197f664 | 5925 | struct io_ring_ctx *ctx = req->ctx; |
fcb323cc | 5926 | |
f56040b8 PB |
5927 | io_req_init_async(req); |
5928 | ||
5b0bbee4 | 5929 | if (req->work.files || (req->flags & REQ_F_NO_FILE_TABLE)) |
f86cd20c | 5930 | return 0; |
b14cca0c | 5931 | if (!ctx->ring_file) |
b5dba59e JA |
5932 | return -EBADF; |
5933 | ||
fcb323cc JA |
5934 | rcu_read_lock(); |
5935 | spin_lock_irq(&ctx->inflight_lock); | |
5936 | /* | |
5937 | * We use the f_ops->flush() handler to ensure that we can flush | |
5938 | * out work accessing these files if the fd is closed. Check if | |
5939 | * the fd has changed since we started down this path, and disallow | |
5940 | * this operation if it has. | |
5941 | */ | |
b14cca0c | 5942 | if (fcheck(ctx->ring_fd) == ctx->ring_file) { |
fcb323cc JA |
5943 | list_add(&req->inflight_entry, &ctx->inflight_list); |
5944 | req->flags |= REQ_F_INFLIGHT; | |
5945 | req->work.files = current->files; | |
5946 | ret = 0; | |
5947 | } | |
5948 | spin_unlock_irq(&ctx->inflight_lock); | |
5949 | rcu_read_unlock(); | |
5950 | ||
5951 | return ret; | |
5952 | } | |
5953 | ||
f56040b8 PB |
5954 | static inline int io_prep_work_files(struct io_kiocb *req) |
5955 | { | |
5956 | if (!io_op_defs[req->opcode].file_table) | |
5957 | return 0; | |
5958 | return io_grab_files(req); | |
5959 | } | |
5960 | ||
2665abfd | 5961 | static enum hrtimer_restart io_link_timeout_fn(struct hrtimer *timer) |
2b188cc1 | 5962 | { |
ad8a48ac JA |
5963 | struct io_timeout_data *data = container_of(timer, |
5964 | struct io_timeout_data, timer); | |
5965 | struct io_kiocb *req = data->req; | |
2665abfd JA |
5966 | struct io_ring_ctx *ctx = req->ctx; |
5967 | struct io_kiocb *prev = NULL; | |
5968 | unsigned long flags; | |
2665abfd JA |
5969 | |
5970 | spin_lock_irqsave(&ctx->completion_lock, flags); | |
5971 | ||
5972 | /* | |
5973 | * We don't expect the list to be empty, that will only happen if we | |
5974 | * race with the completion of the linked work. | |
5975 | */ | |
4493233e PB |
5976 | if (!list_empty(&req->link_list)) { |
5977 | prev = list_entry(req->link_list.prev, struct io_kiocb, | |
5978 | link_list); | |
5d960724 | 5979 | if (refcount_inc_not_zero(&prev->refs)) { |
4493233e | 5980 | list_del_init(&req->link_list); |
5d960724 JA |
5981 | prev->flags &= ~REQ_F_LINK_TIMEOUT; |
5982 | } else | |
76a46e06 | 5983 | prev = NULL; |
2665abfd JA |
5984 | } |
5985 | ||
5986 | spin_unlock_irqrestore(&ctx->completion_lock, flags); | |
5987 | ||
5988 | if (prev) { | |
4e88d6e7 | 5989 | req_set_fail_links(prev); |
014db007 | 5990 | io_async_find_and_cancel(ctx, req, prev->user_data, -ETIME); |
76a46e06 | 5991 | io_put_req(prev); |
47f46768 | 5992 | } else { |
e1e16097 | 5993 | io_req_complete(req, -ETIME); |
2665abfd | 5994 | } |
2665abfd JA |
5995 | return HRTIMER_NORESTART; |
5996 | } | |
5997 | ||
7271ef3a | 5998 | static void __io_queue_linked_timeout(struct io_kiocb *req) |
2665abfd | 5999 | { |
76a46e06 JA |
6000 | /* |
6001 | * If the list is now empty, then our linked request finished before | |
6002 | * we got a chance to setup the timer | |
6003 | */ | |
4493233e | 6004 | if (!list_empty(&req->link_list)) { |
2d28390a | 6005 | struct io_timeout_data *data = &req->io->timeout; |
94ae5e77 | 6006 | |
ad8a48ac JA |
6007 | data->timer.function = io_link_timeout_fn; |
6008 | hrtimer_start(&data->timer, timespec64_to_ktime(data->ts), | |
6009 | data->mode); | |
2665abfd | 6010 | } |
7271ef3a JA |
6011 | } |
6012 | ||
6013 | static void io_queue_linked_timeout(struct io_kiocb *req) | |
6014 | { | |
6015 | struct io_ring_ctx *ctx = req->ctx; | |
6016 | ||
6017 | spin_lock_irq(&ctx->completion_lock); | |
6018 | __io_queue_linked_timeout(req); | |
76a46e06 | 6019 | spin_unlock_irq(&ctx->completion_lock); |
2665abfd | 6020 | |
2665abfd | 6021 | /* drop submission reference */ |
76a46e06 JA |
6022 | io_put_req(req); |
6023 | } | |
2665abfd | 6024 | |
ad8a48ac | 6025 | static struct io_kiocb *io_prep_linked_timeout(struct io_kiocb *req) |
2665abfd JA |
6026 | { |
6027 | struct io_kiocb *nxt; | |
6028 | ||
dea3b49c | 6029 | if (!(req->flags & REQ_F_LINK_HEAD)) |
2665abfd | 6030 | return NULL; |
6df1db6b | 6031 | if (req->flags & REQ_F_LINK_TIMEOUT) |
d7718a9d | 6032 | return NULL; |
2665abfd | 6033 | |
4493233e PB |
6034 | nxt = list_first_entry_or_null(&req->link_list, struct io_kiocb, |
6035 | link_list); | |
d625c6ee | 6036 | if (!nxt || nxt->opcode != IORING_OP_LINK_TIMEOUT) |
76a46e06 | 6037 | return NULL; |
2665abfd | 6038 | |
76a46e06 | 6039 | req->flags |= REQ_F_LINK_TIMEOUT; |
76a46e06 | 6040 | return nxt; |
2665abfd JA |
6041 | } |
6042 | ||
f13fad7b JA |
6043 | static void __io_queue_sqe(struct io_kiocb *req, const struct io_uring_sqe *sqe, |
6044 | struct io_comp_state *cs) | |
2b188cc1 | 6045 | { |
4a0a7a18 | 6046 | struct io_kiocb *linked_timeout; |
4bc4494e | 6047 | struct io_kiocb *nxt; |
193155c8 | 6048 | const struct cred *old_creds = NULL; |
e0c5c576 | 6049 | int ret; |
2b188cc1 | 6050 | |
4a0a7a18 JA |
6051 | again: |
6052 | linked_timeout = io_prep_linked_timeout(req); | |
6053 | ||
7cdaf587 XW |
6054 | if ((req->flags & REQ_F_WORK_INITIALIZED) && req->work.creds && |
6055 | req->work.creds != current_cred()) { | |
193155c8 JA |
6056 | if (old_creds) |
6057 | revert_creds(old_creds); | |
6058 | if (old_creds == req->work.creds) | |
6059 | old_creds = NULL; /* restored original creds */ | |
6060 | else | |
6061 | old_creds = override_creds(req->work.creds); | |
6062 | } | |
6063 | ||
f13fad7b | 6064 | ret = io_issue_sqe(req, sqe, true, cs); |
491381ce JA |
6065 | |
6066 | /* | |
6067 | * We async punt it if the file wasn't marked NOWAIT, or if the file | |
6068 | * doesn't support non-blocking read/write attempts | |
6069 | */ | |
24c74678 | 6070 | if (ret == -EAGAIN && !(req->flags & REQ_F_NOWAIT)) { |
f063c547 | 6071 | if (!io_arm_poll_handler(req)) { |
86a761f8 | 6072 | punt: |
f063c547 PB |
6073 | ret = io_prep_work_files(req); |
6074 | if (unlikely(ret)) | |
bbad27b2 | 6075 | goto err; |
f063c547 PB |
6076 | /* |
6077 | * Queued up for async execution, worker will release | |
6078 | * submit reference when the iocb is actually submitted. | |
6079 | */ | |
6080 | io_queue_async_work(req); | |
2b188cc1 | 6081 | } |
bbad27b2 | 6082 | |
f063c547 PB |
6083 | if (linked_timeout) |
6084 | io_queue_linked_timeout(linked_timeout); | |
4bc4494e | 6085 | goto exit; |
2b188cc1 | 6086 | } |
e65ef56d | 6087 | |
652532ad | 6088 | if (unlikely(ret)) { |
fcb323cc | 6089 | err: |
652532ad PB |
6090 | /* un-prep timeout, so it'll be killed as any other linked */ |
6091 | req->flags &= ~REQ_F_LINK_TIMEOUT; | |
4e88d6e7 | 6092 | req_set_fail_links(req); |
e65ef56d | 6093 | io_put_req(req); |
e1e16097 | 6094 | io_req_complete(req, ret); |
652532ad | 6095 | goto exit; |
9e645e11 | 6096 | } |
652532ad PB |
6097 | |
6098 | /* drop submission reference */ | |
6099 | nxt = io_put_req_find_next(req); | |
6100 | if (linked_timeout) | |
6101 | io_queue_linked_timeout(linked_timeout); | |
6102 | ||
4a0a7a18 JA |
6103 | if (nxt) { |
6104 | req = nxt; | |
86a761f8 PB |
6105 | |
6106 | if (req->flags & REQ_F_FORCE_ASYNC) | |
6107 | goto punt; | |
4a0a7a18 JA |
6108 | goto again; |
6109 | } | |
4bc4494e | 6110 | exit: |
193155c8 JA |
6111 | if (old_creds) |
6112 | revert_creds(old_creds); | |
2b188cc1 JA |
6113 | } |
6114 | ||
f13fad7b JA |
6115 | static void io_queue_sqe(struct io_kiocb *req, const struct io_uring_sqe *sqe, |
6116 | struct io_comp_state *cs) | |
4fe2c963 JL |
6117 | { |
6118 | int ret; | |
6119 | ||
3529d8c2 | 6120 | ret = io_req_defer(req, sqe); |
4fe2c963 JL |
6121 | if (ret) { |
6122 | if (ret != -EIOCBQUEUED) { | |
1118591a | 6123 | fail_req: |
4e88d6e7 | 6124 | req_set_fail_links(req); |
e1e16097 JA |
6125 | io_put_req(req); |
6126 | io_req_complete(req, ret); | |
4fe2c963 | 6127 | } |
2550878f | 6128 | } else if (req->flags & REQ_F_FORCE_ASYNC) { |
bd2ab18a | 6129 | if (!req->io) { |
bd2ab18a | 6130 | ret = io_req_defer_prep(req, sqe); |
327d6d96 | 6131 | if (unlikely(ret)) |
bd2ab18a PB |
6132 | goto fail_req; |
6133 | } | |
6134 | ||
ce35a47a JA |
6135 | /* |
6136 | * Never try inline submit of IOSQE_ASYNC is set, go straight | |
6137 | * to async execution. | |
6138 | */ | |
3e863ea3 | 6139 | io_req_init_async(req); |
ce35a47a JA |
6140 | req->work.flags |= IO_WQ_WORK_CONCURRENT; |
6141 | io_queue_async_work(req); | |
6142 | } else { | |
f13fad7b | 6143 | __io_queue_sqe(req, sqe, cs); |
ce35a47a | 6144 | } |
4fe2c963 JL |
6145 | } |
6146 | ||
f13fad7b JA |
6147 | static inline void io_queue_link_head(struct io_kiocb *req, |
6148 | struct io_comp_state *cs) | |
4fe2c963 | 6149 | { |
94ae5e77 | 6150 | if (unlikely(req->flags & REQ_F_FAIL_LINK)) { |
e1e16097 JA |
6151 | io_put_req(req); |
6152 | io_req_complete(req, -ECANCELED); | |
1b4a51b6 | 6153 | } else |
f13fad7b | 6154 | io_queue_sqe(req, NULL, cs); |
4fe2c963 JL |
6155 | } |
6156 | ||
1d4240cc | 6157 | static int io_submit_sqe(struct io_kiocb *req, const struct io_uring_sqe *sqe, |
f13fad7b | 6158 | struct io_kiocb **link, struct io_comp_state *cs) |
9e645e11 | 6159 | { |
a197f664 | 6160 | struct io_ring_ctx *ctx = req->ctx; |
ef4ff581 | 6161 | int ret; |
9e645e11 | 6162 | |
9e645e11 JA |
6163 | /* |
6164 | * If we already have a head request, queue this one for async | |
6165 | * submittal once the head completes. If we don't have a head but | |
6166 | * IOSQE_IO_LINK is set in the sqe, start a new head. This one will be | |
6167 | * submitted sync once the chain is complete. If none of those | |
6168 | * conditions are true (normal request), then just queue it. | |
6169 | */ | |
6170 | if (*link) { | |
9d76377f | 6171 | struct io_kiocb *head = *link; |
4e88d6e7 | 6172 | |
8cdf2193 PB |
6173 | /* |
6174 | * Taking sequential execution of a link, draining both sides | |
6175 | * of the link also fullfils IOSQE_IO_DRAIN semantics for all | |
6176 | * requests in the link. So, it drains the head and the | |
6177 | * next after the link request. The last one is done via | |
6178 | * drain_next flag to persist the effect across calls. | |
6179 | */ | |
ef4ff581 | 6180 | if (req->flags & REQ_F_IO_DRAIN) { |
711be031 PB |
6181 | head->flags |= REQ_F_IO_DRAIN; |
6182 | ctx->drain_next = 1; | |
6183 | } | |
3529d8c2 | 6184 | ret = io_req_defer_prep(req, sqe); |
327d6d96 | 6185 | if (unlikely(ret)) { |
4e88d6e7 | 6186 | /* fail even hard links since we don't submit */ |
9d76377f | 6187 | head->flags |= REQ_F_FAIL_LINK; |
1d4240cc | 6188 | return ret; |
2d28390a | 6189 | } |
9d76377f | 6190 | trace_io_uring_link(ctx, req, head); |
c40f6379 | 6191 | io_get_req_task(req); |
9d76377f | 6192 | list_add_tail(&req->link_list, &head->link_list); |
32fe525b PB |
6193 | |
6194 | /* last request of a link, enqueue the link */ | |
ef4ff581 | 6195 | if (!(req->flags & (REQ_F_LINK | REQ_F_HARDLINK))) { |
f13fad7b | 6196 | io_queue_link_head(head, cs); |
32fe525b PB |
6197 | *link = NULL; |
6198 | } | |
9e645e11 | 6199 | } else { |
711be031 PB |
6200 | if (unlikely(ctx->drain_next)) { |
6201 | req->flags |= REQ_F_IO_DRAIN; | |
ef4ff581 | 6202 | ctx->drain_next = 0; |
711be031 | 6203 | } |
ef4ff581 | 6204 | if (req->flags & (REQ_F_LINK | REQ_F_HARDLINK)) { |
dea3b49c | 6205 | req->flags |= REQ_F_LINK_HEAD; |
711be031 | 6206 | INIT_LIST_HEAD(&req->link_list); |
f1d96a8f | 6207 | |
711be031 | 6208 | ret = io_req_defer_prep(req, sqe); |
327d6d96 | 6209 | if (unlikely(ret)) |
711be031 PB |
6210 | req->flags |= REQ_F_FAIL_LINK; |
6211 | *link = req; | |
6212 | } else { | |
f13fad7b | 6213 | io_queue_sqe(req, sqe, cs); |
711be031 | 6214 | } |
9e645e11 | 6215 | } |
2e6e1fde | 6216 | |
1d4240cc | 6217 | return 0; |
9e645e11 JA |
6218 | } |
6219 | ||
9a56a232 JA |
6220 | /* |
6221 | * Batched submission is done, ensure local IO is flushed out. | |
6222 | */ | |
6223 | static void io_submit_state_end(struct io_submit_state *state) | |
6224 | { | |
f13fad7b JA |
6225 | if (!list_empty(&state->comp.list)) |
6226 | io_submit_flush_completions(&state->comp); | |
9a56a232 | 6227 | blk_finish_plug(&state->plug); |
9f13c35b | 6228 | io_state_file_put(state); |
2579f913 | 6229 | if (state->free_reqs) |
6c8a3134 | 6230 | kmem_cache_free_bulk(req_cachep, state->free_reqs, state->reqs); |
9a56a232 JA |
6231 | } |
6232 | ||
6233 | /* | |
6234 | * Start submission side cache. | |
6235 | */ | |
6236 | static void io_submit_state_start(struct io_submit_state *state, | |
013538bd | 6237 | struct io_ring_ctx *ctx, unsigned int max_ios) |
9a56a232 JA |
6238 | { |
6239 | blk_start_plug(&state->plug); | |
b63534c4 JA |
6240 | #ifdef CONFIG_BLOCK |
6241 | state->plug.nowait = true; | |
6242 | #endif | |
013538bd JA |
6243 | state->comp.nr = 0; |
6244 | INIT_LIST_HEAD(&state->comp.list); | |
6245 | state->comp.ctx = ctx; | |
2579f913 | 6246 | state->free_reqs = 0; |
9a56a232 JA |
6247 | state->file = NULL; |
6248 | state->ios_left = max_ios; | |
6249 | } | |
6250 | ||
2b188cc1 JA |
6251 | static void io_commit_sqring(struct io_ring_ctx *ctx) |
6252 | { | |
75b28aff | 6253 | struct io_rings *rings = ctx->rings; |
2b188cc1 | 6254 | |
caf582c6 PB |
6255 | /* |
6256 | * Ensure any loads from the SQEs are done at this point, | |
6257 | * since once we write the new head, the application could | |
6258 | * write new data to them. | |
6259 | */ | |
6260 | smp_store_release(&rings->sq.head, ctx->cached_sq_head); | |
2b188cc1 JA |
6261 | } |
6262 | ||
2b188cc1 | 6263 | /* |
3529d8c2 | 6264 | * Fetch an sqe, if one is available. Note that sqe_ptr will point to memory |
2b188cc1 JA |
6265 | * that is mapped by userspace. This means that care needs to be taken to |
6266 | * ensure that reads are stable, as we cannot rely on userspace always | |
6267 | * being a good citizen. If members of the sqe are validated and then later | |
6268 | * used, it's important that those reads are done through READ_ONCE() to | |
6269 | * prevent a re-load down the line. | |
6270 | */ | |
709b302f | 6271 | static const struct io_uring_sqe *io_get_sqe(struct io_ring_ctx *ctx) |
2b188cc1 | 6272 | { |
75b28aff | 6273 | u32 *sq_array = ctx->sq_array; |
2b188cc1 JA |
6274 | unsigned head; |
6275 | ||
6276 | /* | |
6277 | * The cached sq head (or cq tail) serves two purposes: | |
6278 | * | |
6279 | * 1) allows us to batch the cost of updating the user visible | |
6280 | * head updates. | |
6281 | * 2) allows the kernel side to track the head on its own, even | |
6282 | * though the application is the one updating it. | |
6283 | */ | |
ee7d46d9 | 6284 | head = READ_ONCE(sq_array[ctx->cached_sq_head & ctx->sq_mask]); |
709b302f PB |
6285 | if (likely(head < ctx->sq_entries)) |
6286 | return &ctx->sq_sqes[head]; | |
2b188cc1 JA |
6287 | |
6288 | /* drop invalid entries */ | |
498ccd9e | 6289 | ctx->cached_sq_dropped++; |
ee7d46d9 | 6290 | WRITE_ONCE(ctx->rings->sq_dropped, ctx->cached_sq_dropped); |
709b302f PB |
6291 | return NULL; |
6292 | } | |
6293 | ||
6294 | static inline void io_consume_sqe(struct io_ring_ctx *ctx) | |
6295 | { | |
6296 | ctx->cached_sq_head++; | |
2b188cc1 JA |
6297 | } |
6298 | ||
ef4ff581 PB |
6299 | #define SQE_VALID_FLAGS (IOSQE_FIXED_FILE|IOSQE_IO_DRAIN|IOSQE_IO_LINK| \ |
6300 | IOSQE_IO_HARDLINK | IOSQE_ASYNC | \ | |
6301 | IOSQE_BUFFER_SELECT) | |
6302 | ||
6303 | static int io_init_req(struct io_ring_ctx *ctx, struct io_kiocb *req, | |
6304 | const struct io_uring_sqe *sqe, | |
0cdaf760 | 6305 | struct io_submit_state *state) |
0553b8bd | 6306 | { |
ef4ff581 | 6307 | unsigned int sqe_flags; |
63ff8223 | 6308 | int id; |
ef4ff581 | 6309 | |
0553b8bd PB |
6310 | req->opcode = READ_ONCE(sqe->opcode); |
6311 | req->user_data = READ_ONCE(sqe->user_data); | |
6312 | req->io = NULL; | |
6313 | req->file = NULL; | |
6314 | req->ctx = ctx; | |
6315 | req->flags = 0; | |
6316 | /* one is dropped after submission, the other at completion */ | |
6317 | refcount_set(&req->refs, 2); | |
4dd2824d | 6318 | req->task = current; |
0553b8bd | 6319 | req->result = 0; |
ef4ff581 PB |
6320 | |
6321 | if (unlikely(req->opcode >= IORING_OP_LAST)) | |
6322 | return -EINVAL; | |
6323 | ||
9d8426a0 JA |
6324 | if (unlikely(io_sq_thread_acquire_mm(ctx, req))) |
6325 | return -EFAULT; | |
ef4ff581 PB |
6326 | |
6327 | sqe_flags = READ_ONCE(sqe->flags); | |
6328 | /* enforce forwards compatibility on users */ | |
6329 | if (unlikely(sqe_flags & ~SQE_VALID_FLAGS)) | |
6330 | return -EINVAL; | |
6331 | ||
6332 | if ((sqe_flags & IOSQE_BUFFER_SELECT) && | |
6333 | !io_op_defs[req->opcode].buffer_select) | |
6334 | return -EOPNOTSUPP; | |
6335 | ||
6336 | id = READ_ONCE(sqe->personality); | |
6337 | if (id) { | |
7cdaf587 | 6338 | io_req_init_async(req); |
ef4ff581 PB |
6339 | req->work.creds = idr_find(&ctx->personality_idr, id); |
6340 | if (unlikely(!req->work.creds)) | |
6341 | return -EINVAL; | |
6342 | get_cred(req->work.creds); | |
6343 | } | |
6344 | ||
6345 | /* same numerical values with corresponding REQ_F_*, safe to copy */ | |
c11368a5 | 6346 | req->flags |= sqe_flags; |
ef4ff581 | 6347 | |
63ff8223 JA |
6348 | if (!io_op_defs[req->opcode].needs_file) |
6349 | return 0; | |
6350 | ||
6351 | return io_req_set_file(state, req, READ_ONCE(sqe->fd)); | |
0553b8bd PB |
6352 | } |
6353 | ||
fb5ccc98 | 6354 | static int io_submit_sqes(struct io_ring_ctx *ctx, unsigned int nr, |
0cdaf760 | 6355 | struct file *ring_file, int ring_fd) |
6c271ce2 | 6356 | { |
ac8691c4 | 6357 | struct io_submit_state state; |
9e645e11 | 6358 | struct io_kiocb *link = NULL; |
9e645e11 | 6359 | int i, submitted = 0; |
6c271ce2 | 6360 | |
c4a2ed72 | 6361 | /* if we have a backlog and couldn't flush it all, return BUSY */ |
ad3eb2c8 JA |
6362 | if (test_bit(0, &ctx->sq_check_overflow)) { |
6363 | if (!list_empty(&ctx->cq_overflow_list) && | |
6364 | !io_cqring_overflow_flush(ctx, false)) | |
6365 | return -EBUSY; | |
6366 | } | |
6c271ce2 | 6367 | |
ee7d46d9 PB |
6368 | /* make sure SQ entry isn't read before tail */ |
6369 | nr = min3(nr, ctx->sq_entries, io_sqring_entries(ctx)); | |
9ef4f124 | 6370 | |
2b85edfc PB |
6371 | if (!percpu_ref_tryget_many(&ctx->refs, nr)) |
6372 | return -EAGAIN; | |
6c271ce2 | 6373 | |
013538bd | 6374 | io_submit_state_start(&state, ctx, nr); |
6c271ce2 | 6375 | |
b14cca0c PB |
6376 | ctx->ring_fd = ring_fd; |
6377 | ctx->ring_file = ring_file; | |
6378 | ||
6c271ce2 | 6379 | for (i = 0; i < nr; i++) { |
3529d8c2 | 6380 | const struct io_uring_sqe *sqe; |
196be95c | 6381 | struct io_kiocb *req; |
1cb1edb2 | 6382 | int err; |
fb5ccc98 | 6383 | |
b1e50e54 PB |
6384 | sqe = io_get_sqe(ctx); |
6385 | if (unlikely(!sqe)) { | |
6386 | io_consume_sqe(ctx); | |
6387 | break; | |
6388 | } | |
ac8691c4 | 6389 | req = io_alloc_req(ctx, &state); |
196be95c PB |
6390 | if (unlikely(!req)) { |
6391 | if (!submitted) | |
6392 | submitted = -EAGAIN; | |
fb5ccc98 | 6393 | break; |
196be95c | 6394 | } |
fb5ccc98 | 6395 | |
ac8691c4 | 6396 | err = io_init_req(ctx, req, sqe, &state); |
709b302f | 6397 | io_consume_sqe(ctx); |
d3656344 JA |
6398 | /* will complete beyond this point, count as submitted */ |
6399 | submitted++; | |
6400 | ||
ef4ff581 | 6401 | if (unlikely(err)) { |
1cb1edb2 | 6402 | fail_req: |
e1e16097 JA |
6403 | io_put_req(req); |
6404 | io_req_complete(req, err); | |
196be95c PB |
6405 | break; |
6406 | } | |
fb5ccc98 | 6407 | |
354420f7 | 6408 | trace_io_uring_submit_sqe(ctx, req->opcode, req->user_data, |
0cdaf760 | 6409 | true, io_async_submit(ctx)); |
f13fad7b | 6410 | err = io_submit_sqe(req, sqe, &link, &state.comp); |
1d4240cc PB |
6411 | if (err) |
6412 | goto fail_req; | |
6c271ce2 JA |
6413 | } |
6414 | ||
9466f437 PB |
6415 | if (unlikely(submitted != nr)) { |
6416 | int ref_used = (submitted == -EAGAIN) ? 0 : submitted; | |
6417 | ||
6418 | percpu_ref_put_many(&ctx->refs, nr - ref_used); | |
6419 | } | |
9e645e11 | 6420 | if (link) |
f13fad7b | 6421 | io_queue_link_head(link, &state.comp); |
ac8691c4 | 6422 | io_submit_state_end(&state); |
6c271ce2 | 6423 | |
ae9428ca PB |
6424 | /* Commit SQ ring head once we've consumed and submitted all SQEs */ |
6425 | io_commit_sqring(ctx); | |
6426 | ||
6c271ce2 JA |
6427 | return submitted; |
6428 | } | |
6429 | ||
23b3628e XW |
6430 | static inline void io_ring_set_wakeup_flag(struct io_ring_ctx *ctx) |
6431 | { | |
6432 | /* Tell userspace we may need a wakeup call */ | |
6433 | spin_lock_irq(&ctx->completion_lock); | |
6434 | ctx->rings->sq_flags |= IORING_SQ_NEED_WAKEUP; | |
6435 | spin_unlock_irq(&ctx->completion_lock); | |
6436 | } | |
6437 | ||
6438 | static inline void io_ring_clear_wakeup_flag(struct io_ring_ctx *ctx) | |
6439 | { | |
6440 | spin_lock_irq(&ctx->completion_lock); | |
6441 | ctx->rings->sq_flags &= ~IORING_SQ_NEED_WAKEUP; | |
6442 | spin_unlock_irq(&ctx->completion_lock); | |
6443 | } | |
6444 | ||
6c271ce2 JA |
6445 | static int io_sq_thread(void *data) |
6446 | { | |
6c271ce2 | 6447 | struct io_ring_ctx *ctx = data; |
181e448d | 6448 | const struct cred *old_cred; |
6c271ce2 | 6449 | DEFINE_WAIT(wait); |
6c271ce2 | 6450 | unsigned long timeout; |
bdcd3eab | 6451 | int ret = 0; |
6c271ce2 | 6452 | |
0f158b4c | 6453 | complete(&ctx->sq_thread_comp); |
a4c0b3de | 6454 | |
181e448d | 6455 | old_cred = override_creds(ctx->creds); |
6c271ce2 | 6456 | |
bdcd3eab | 6457 | timeout = jiffies + ctx->sq_thread_idle; |
2bbcd6d3 | 6458 | while (!kthread_should_park()) { |
fb5ccc98 | 6459 | unsigned int to_submit; |
6c271ce2 | 6460 | |
540e32a0 | 6461 | if (!list_empty(&ctx->iopoll_list)) { |
6c271ce2 JA |
6462 | unsigned nr_events = 0; |
6463 | ||
bdcd3eab | 6464 | mutex_lock(&ctx->uring_lock); |
540e32a0 | 6465 | if (!list_empty(&ctx->iopoll_list) && !need_resched()) |
9dedd563 | 6466 | io_do_iopoll(ctx, &nr_events, 0); |
bdcd3eab | 6467 | else |
6c271ce2 | 6468 | timeout = jiffies + ctx->sq_thread_idle; |
bdcd3eab | 6469 | mutex_unlock(&ctx->uring_lock); |
6c271ce2 JA |
6470 | } |
6471 | ||
fb5ccc98 | 6472 | to_submit = io_sqring_entries(ctx); |
c1edbf5f JA |
6473 | |
6474 | /* | |
6475 | * If submit got -EBUSY, flag us as needing the application | |
6476 | * to enter the kernel to reap and flush events. | |
6477 | */ | |
b772f07a | 6478 | if (!to_submit || ret == -EBUSY || need_resched()) { |
7143b5ac SG |
6479 | /* |
6480 | * Drop cur_mm before scheduling, we can't hold it for | |
6481 | * long periods (or over schedule()). Do this before | |
6482 | * adding ourselves to the waitqueue, as the unuse/drop | |
6483 | * may sleep. | |
6484 | */ | |
4349f30e | 6485 | io_sq_thread_drop_mm(); |
7143b5ac | 6486 | |
6c271ce2 JA |
6487 | /* |
6488 | * We're polling. If we're within the defined idle | |
6489 | * period, then let us spin without work before going | |
c1edbf5f JA |
6490 | * to sleep. The exception is if we got EBUSY doing |
6491 | * more IO, we should wait for the application to | |
6492 | * reap events and wake us up. | |
6c271ce2 | 6493 | */ |
540e32a0 | 6494 | if (!list_empty(&ctx->iopoll_list) || need_resched() || |
df069d80 JA |
6495 | (!time_after(jiffies, timeout) && ret != -EBUSY && |
6496 | !percpu_ref_is_dying(&ctx->refs))) { | |
4c6e277c | 6497 | io_run_task_work(); |
9831a90c | 6498 | cond_resched(); |
6c271ce2 JA |
6499 | continue; |
6500 | } | |
6501 | ||
6c271ce2 JA |
6502 | prepare_to_wait(&ctx->sqo_wait, &wait, |
6503 | TASK_INTERRUPTIBLE); | |
6504 | ||
bdcd3eab XW |
6505 | /* |
6506 | * While doing polled IO, before going to sleep, we need | |
540e32a0 PB |
6507 | * to check if there are new reqs added to iopoll_list, |
6508 | * it is because reqs may have been punted to io worker | |
6509 | * and will be added to iopoll_list later, hence check | |
6510 | * the iopoll_list again. | |
bdcd3eab XW |
6511 | */ |
6512 | if ((ctx->flags & IORING_SETUP_IOPOLL) && | |
540e32a0 | 6513 | !list_empty_careful(&ctx->iopoll_list)) { |
bdcd3eab XW |
6514 | finish_wait(&ctx->sqo_wait, &wait); |
6515 | continue; | |
6516 | } | |
6517 | ||
23b3628e | 6518 | io_ring_set_wakeup_flag(ctx); |
6c271ce2 | 6519 | |
fb5ccc98 | 6520 | to_submit = io_sqring_entries(ctx); |
c1edbf5f | 6521 | if (!to_submit || ret == -EBUSY) { |
2bbcd6d3 | 6522 | if (kthread_should_park()) { |
6c271ce2 JA |
6523 | finish_wait(&ctx->sqo_wait, &wait); |
6524 | break; | |
6525 | } | |
4c6e277c | 6526 | if (io_run_task_work()) { |
10bea96d | 6527 | finish_wait(&ctx->sqo_wait, &wait); |
23b3628e | 6528 | io_ring_clear_wakeup_flag(ctx); |
b41e9852 JA |
6529 | continue; |
6530 | } | |
6c271ce2 JA |
6531 | if (signal_pending(current)) |
6532 | flush_signals(current); | |
6533 | schedule(); | |
6534 | finish_wait(&ctx->sqo_wait, &wait); | |
6535 | ||
23b3628e | 6536 | io_ring_clear_wakeup_flag(ctx); |
d4ae271d | 6537 | ret = 0; |
6c271ce2 JA |
6538 | continue; |
6539 | } | |
6540 | finish_wait(&ctx->sqo_wait, &wait); | |
6541 | ||
23b3628e | 6542 | io_ring_clear_wakeup_flag(ctx); |
6c271ce2 JA |
6543 | } |
6544 | ||
8a4955ff | 6545 | mutex_lock(&ctx->uring_lock); |
6b668c9b XW |
6546 | if (likely(!percpu_ref_is_dying(&ctx->refs))) |
6547 | ret = io_submit_sqes(ctx, to_submit, NULL, -1); | |
8a4955ff | 6548 | mutex_unlock(&ctx->uring_lock); |
bdcd3eab | 6549 | timeout = jiffies + ctx->sq_thread_idle; |
6c271ce2 JA |
6550 | } |
6551 | ||
4c6e277c | 6552 | io_run_task_work(); |
b41e9852 | 6553 | |
4349f30e | 6554 | io_sq_thread_drop_mm(); |
181e448d | 6555 | revert_creds(old_cred); |
06058632 | 6556 | |
2bbcd6d3 | 6557 | kthread_parkme(); |
06058632 | 6558 | |
6c271ce2 JA |
6559 | return 0; |
6560 | } | |
6561 | ||
bda52162 JA |
6562 | struct io_wait_queue { |
6563 | struct wait_queue_entry wq; | |
6564 | struct io_ring_ctx *ctx; | |
6565 | unsigned to_wait; | |
6566 | unsigned nr_timeouts; | |
6567 | }; | |
6568 | ||
1d7bb1d5 | 6569 | static inline bool io_should_wake(struct io_wait_queue *iowq, bool noflush) |
bda52162 JA |
6570 | { |
6571 | struct io_ring_ctx *ctx = iowq->ctx; | |
6572 | ||
6573 | /* | |
d195a66e | 6574 | * Wake up if we have enough events, or if a timeout occurred since we |
bda52162 JA |
6575 | * started waiting. For timeouts, we always want to return to userspace, |
6576 | * regardless of event count. | |
6577 | */ | |
1d7bb1d5 | 6578 | return io_cqring_events(ctx, noflush) >= iowq->to_wait || |
bda52162 JA |
6579 | atomic_read(&ctx->cq_timeouts) != iowq->nr_timeouts; |
6580 | } | |
6581 | ||
6582 | static int io_wake_function(struct wait_queue_entry *curr, unsigned int mode, | |
6583 | int wake_flags, void *key) | |
6584 | { | |
6585 | struct io_wait_queue *iowq = container_of(curr, struct io_wait_queue, | |
6586 | wq); | |
6587 | ||
1d7bb1d5 JA |
6588 | /* use noflush == true, as we can't safely rely on locking context */ |
6589 | if (!io_should_wake(iowq, true)) | |
bda52162 JA |
6590 | return -1; |
6591 | ||
6592 | return autoremove_wake_function(curr, mode, wake_flags, key); | |
6593 | } | |
6594 | ||
2b188cc1 JA |
6595 | /* |
6596 | * Wait until events become available, if we don't already have some. The | |
6597 | * application must reap them itself, as they reside on the shared cq ring. | |
6598 | */ | |
6599 | static int io_cqring_wait(struct io_ring_ctx *ctx, int min_events, | |
6600 | const sigset_t __user *sig, size_t sigsz) | |
6601 | { | |
bda52162 JA |
6602 | struct io_wait_queue iowq = { |
6603 | .wq = { | |
6604 | .private = current, | |
6605 | .func = io_wake_function, | |
6606 | .entry = LIST_HEAD_INIT(iowq.wq.entry), | |
6607 | }, | |
6608 | .ctx = ctx, | |
6609 | .to_wait = min_events, | |
6610 | }; | |
75b28aff | 6611 | struct io_rings *rings = ctx->rings; |
e9ffa5c2 | 6612 | int ret = 0; |
2b188cc1 | 6613 | |
b41e9852 JA |
6614 | do { |
6615 | if (io_cqring_events(ctx, false) >= min_events) | |
6616 | return 0; | |
4c6e277c | 6617 | if (!io_run_task_work()) |
b41e9852 | 6618 | break; |
b41e9852 | 6619 | } while (1); |
2b188cc1 JA |
6620 | |
6621 | if (sig) { | |
9e75ad5d AB |
6622 | #ifdef CONFIG_COMPAT |
6623 | if (in_compat_syscall()) | |
6624 | ret = set_compat_user_sigmask((const compat_sigset_t __user *)sig, | |
b772434b | 6625 | sigsz); |
9e75ad5d AB |
6626 | else |
6627 | #endif | |
b772434b | 6628 | ret = set_user_sigmask(sig, sigsz); |
9e75ad5d | 6629 | |
2b188cc1 JA |
6630 | if (ret) |
6631 | return ret; | |
6632 | } | |
6633 | ||
bda52162 | 6634 | iowq.nr_timeouts = atomic_read(&ctx->cq_timeouts); |
c826bd7a | 6635 | trace_io_uring_cqring_wait(ctx, min_events); |
bda52162 JA |
6636 | do { |
6637 | prepare_to_wait_exclusive(&ctx->wait, &iowq.wq, | |
6638 | TASK_INTERRUPTIBLE); | |
ce593a6c | 6639 | /* make sure we run task_work before checking for signals */ |
4c6e277c JA |
6640 | if (io_run_task_work()) |
6641 | continue; | |
bda52162 | 6642 | if (signal_pending(current)) { |
b7db41c9 JA |
6643 | if (current->jobctl & JOBCTL_TASK_WORK) { |
6644 | spin_lock_irq(¤t->sighand->siglock); | |
6645 | current->jobctl &= ~JOBCTL_TASK_WORK; | |
6646 | recalc_sigpending(); | |
6647 | spin_unlock_irq(¤t->sighand->siglock); | |
6648 | continue; | |
6649 | } | |
6650 | ret = -EINTR; | |
bda52162 JA |
6651 | break; |
6652 | } | |
ce593a6c JA |
6653 | if (io_should_wake(&iowq, false)) |
6654 | break; | |
6655 | schedule(); | |
bda52162 JA |
6656 | } while (1); |
6657 | finish_wait(&ctx->wait, &iowq.wq); | |
6658 | ||
b7db41c9 | 6659 | restore_saved_sigmask_unless(ret == -EINTR); |
2b188cc1 | 6660 | |
75b28aff | 6661 | return READ_ONCE(rings->cq.head) == READ_ONCE(rings->cq.tail) ? ret : 0; |
2b188cc1 JA |
6662 | } |
6663 | ||
6b06314c JA |
6664 | static void __io_sqe_files_unregister(struct io_ring_ctx *ctx) |
6665 | { | |
6666 | #if defined(CONFIG_UNIX) | |
6667 | if (ctx->ring_sock) { | |
6668 | struct sock *sock = ctx->ring_sock->sk; | |
6669 | struct sk_buff *skb; | |
6670 | ||
6671 | while ((skb = skb_dequeue(&sock->sk_receive_queue)) != NULL) | |
6672 | kfree_skb(skb); | |
6673 | } | |
6674 | #else | |
6675 | int i; | |
6676 | ||
65e19f54 JA |
6677 | for (i = 0; i < ctx->nr_user_files; i++) { |
6678 | struct file *file; | |
6679 | ||
6680 | file = io_file_from_index(ctx, i); | |
6681 | if (file) | |
6682 | fput(file); | |
6683 | } | |
6b06314c JA |
6684 | #endif |
6685 | } | |
6686 | ||
05f3fb3c JA |
6687 | static void io_file_ref_kill(struct percpu_ref *ref) |
6688 | { | |
6689 | struct fixed_file_data *data; | |
6690 | ||
6691 | data = container_of(ref, struct fixed_file_data, refs); | |
6692 | complete(&data->done); | |
6693 | } | |
6694 | ||
6b06314c JA |
6695 | static int io_sqe_files_unregister(struct io_ring_ctx *ctx) |
6696 | { | |
05f3fb3c | 6697 | struct fixed_file_data *data = ctx->file_data; |
05589553 | 6698 | struct fixed_file_ref_node *ref_node = NULL; |
65e19f54 JA |
6699 | unsigned nr_tables, i; |
6700 | ||
05f3fb3c | 6701 | if (!data) |
6b06314c JA |
6702 | return -ENXIO; |
6703 | ||
6a4d07cd | 6704 | spin_lock(&data->lock); |
05589553 XW |
6705 | if (!list_empty(&data->ref_list)) |
6706 | ref_node = list_first_entry(&data->ref_list, | |
6707 | struct fixed_file_ref_node, node); | |
6a4d07cd | 6708 | spin_unlock(&data->lock); |
05589553 XW |
6709 | if (ref_node) |
6710 | percpu_ref_kill(&ref_node->refs); | |
6711 | ||
6712 | percpu_ref_kill(&data->refs); | |
6713 | ||
6714 | /* wait for all refs nodes to complete */ | |
4a38aed2 | 6715 | flush_delayed_work(&ctx->file_put_work); |
2faf852d | 6716 | wait_for_completion(&data->done); |
05f3fb3c | 6717 | |
6b06314c | 6718 | __io_sqe_files_unregister(ctx); |
65e19f54 JA |
6719 | nr_tables = DIV_ROUND_UP(ctx->nr_user_files, IORING_MAX_FILES_TABLE); |
6720 | for (i = 0; i < nr_tables; i++) | |
05f3fb3c JA |
6721 | kfree(data->table[i].files); |
6722 | kfree(data->table); | |
05589553 XW |
6723 | percpu_ref_exit(&data->refs); |
6724 | kfree(data); | |
05f3fb3c | 6725 | ctx->file_data = NULL; |
6b06314c JA |
6726 | ctx->nr_user_files = 0; |
6727 | return 0; | |
6728 | } | |
6729 | ||
6c271ce2 JA |
6730 | static void io_sq_thread_stop(struct io_ring_ctx *ctx) |
6731 | { | |
6732 | if (ctx->sqo_thread) { | |
0f158b4c | 6733 | wait_for_completion(&ctx->sq_thread_comp); |
2bbcd6d3 RP |
6734 | /* |
6735 | * The park is a bit of a work-around, without it we get | |
6736 | * warning spews on shutdown with SQPOLL set and affinity | |
6737 | * set to a single CPU. | |
6738 | */ | |
06058632 | 6739 | kthread_park(ctx->sqo_thread); |
6c271ce2 JA |
6740 | kthread_stop(ctx->sqo_thread); |
6741 | ctx->sqo_thread = NULL; | |
6742 | } | |
6743 | } | |
6744 | ||
6b06314c JA |
6745 | static void io_finish_async(struct io_ring_ctx *ctx) |
6746 | { | |
6c271ce2 JA |
6747 | io_sq_thread_stop(ctx); |
6748 | ||
561fb04a JA |
6749 | if (ctx->io_wq) { |
6750 | io_wq_destroy(ctx->io_wq); | |
6751 | ctx->io_wq = NULL; | |
6b06314c JA |
6752 | } |
6753 | } | |
6754 | ||
6755 | #if defined(CONFIG_UNIX) | |
6b06314c JA |
6756 | /* |
6757 | * Ensure the UNIX gc is aware of our file set, so we are certain that | |
6758 | * the io_uring can be safely unregistered on process exit, even if we have | |
6759 | * loops in the file referencing. | |
6760 | */ | |
6761 | static int __io_sqe_files_scm(struct io_ring_ctx *ctx, int nr, int offset) | |
6762 | { | |
6763 | struct sock *sk = ctx->ring_sock->sk; | |
6764 | struct scm_fp_list *fpl; | |
6765 | struct sk_buff *skb; | |
08a45173 | 6766 | int i, nr_files; |
6b06314c | 6767 | |
6b06314c JA |
6768 | fpl = kzalloc(sizeof(*fpl), GFP_KERNEL); |
6769 | if (!fpl) | |
6770 | return -ENOMEM; | |
6771 | ||
6772 | skb = alloc_skb(0, GFP_KERNEL); | |
6773 | if (!skb) { | |
6774 | kfree(fpl); | |
6775 | return -ENOMEM; | |
6776 | } | |
6777 | ||
6778 | skb->sk = sk; | |
6b06314c | 6779 | |
08a45173 | 6780 | nr_files = 0; |
6b06314c JA |
6781 | fpl->user = get_uid(ctx->user); |
6782 | for (i = 0; i < nr; i++) { | |
65e19f54 JA |
6783 | struct file *file = io_file_from_index(ctx, i + offset); |
6784 | ||
6785 | if (!file) | |
08a45173 | 6786 | continue; |
65e19f54 | 6787 | fpl->fp[nr_files] = get_file(file); |
08a45173 JA |
6788 | unix_inflight(fpl->user, fpl->fp[nr_files]); |
6789 | nr_files++; | |
6b06314c JA |
6790 | } |
6791 | ||
08a45173 JA |
6792 | if (nr_files) { |
6793 | fpl->max = SCM_MAX_FD; | |
6794 | fpl->count = nr_files; | |
6795 | UNIXCB(skb).fp = fpl; | |
05f3fb3c | 6796 | skb->destructor = unix_destruct_scm; |
08a45173 JA |
6797 | refcount_add(skb->truesize, &sk->sk_wmem_alloc); |
6798 | skb_queue_head(&sk->sk_receive_queue, skb); | |
6b06314c | 6799 | |
08a45173 JA |
6800 | for (i = 0; i < nr_files; i++) |
6801 | fput(fpl->fp[i]); | |
6802 | } else { | |
6803 | kfree_skb(skb); | |
6804 | kfree(fpl); | |
6805 | } | |
6b06314c JA |
6806 | |
6807 | return 0; | |
6808 | } | |
6809 | ||
6810 | /* | |
6811 | * If UNIX sockets are enabled, fd passing can cause a reference cycle which | |
6812 | * causes regular reference counting to break down. We rely on the UNIX | |
6813 | * garbage collection to take care of this problem for us. | |
6814 | */ | |
6815 | static int io_sqe_files_scm(struct io_ring_ctx *ctx) | |
6816 | { | |
6817 | unsigned left, total; | |
6818 | int ret = 0; | |
6819 | ||
6820 | total = 0; | |
6821 | left = ctx->nr_user_files; | |
6822 | while (left) { | |
6823 | unsigned this_files = min_t(unsigned, left, SCM_MAX_FD); | |
6b06314c JA |
6824 | |
6825 | ret = __io_sqe_files_scm(ctx, this_files, total); | |
6826 | if (ret) | |
6827 | break; | |
6828 | left -= this_files; | |
6829 | total += this_files; | |
6830 | } | |
6831 | ||
6832 | if (!ret) | |
6833 | return 0; | |
6834 | ||
6835 | while (total < ctx->nr_user_files) { | |
65e19f54 JA |
6836 | struct file *file = io_file_from_index(ctx, total); |
6837 | ||
6838 | if (file) | |
6839 | fput(file); | |
6b06314c JA |
6840 | total++; |
6841 | } | |
6842 | ||
6843 | return ret; | |
6844 | } | |
6845 | #else | |
6846 | static int io_sqe_files_scm(struct io_ring_ctx *ctx) | |
6847 | { | |
6848 | return 0; | |
6849 | } | |
6850 | #endif | |
6851 | ||
65e19f54 JA |
6852 | static int io_sqe_alloc_file_tables(struct io_ring_ctx *ctx, unsigned nr_tables, |
6853 | unsigned nr_files) | |
6854 | { | |
6855 | int i; | |
6856 | ||
6857 | for (i = 0; i < nr_tables; i++) { | |
05f3fb3c | 6858 | struct fixed_file_table *table = &ctx->file_data->table[i]; |
65e19f54 JA |
6859 | unsigned this_files; |
6860 | ||
6861 | this_files = min(nr_files, IORING_MAX_FILES_TABLE); | |
6862 | table->files = kcalloc(this_files, sizeof(struct file *), | |
6863 | GFP_KERNEL); | |
6864 | if (!table->files) | |
6865 | break; | |
6866 | nr_files -= this_files; | |
6867 | } | |
6868 | ||
6869 | if (i == nr_tables) | |
6870 | return 0; | |
6871 | ||
6872 | for (i = 0; i < nr_tables; i++) { | |
05f3fb3c | 6873 | struct fixed_file_table *table = &ctx->file_data->table[i]; |
65e19f54 JA |
6874 | kfree(table->files); |
6875 | } | |
6876 | return 1; | |
6877 | } | |
6878 | ||
05f3fb3c JA |
6879 | static void io_ring_file_put(struct io_ring_ctx *ctx, struct file *file) |
6880 | { | |
6881 | #if defined(CONFIG_UNIX) | |
6882 | struct sock *sock = ctx->ring_sock->sk; | |
6883 | struct sk_buff_head list, *head = &sock->sk_receive_queue; | |
6884 | struct sk_buff *skb; | |
6885 | int i; | |
6886 | ||
6887 | __skb_queue_head_init(&list); | |
6888 | ||
6889 | /* | |
6890 | * Find the skb that holds this file in its SCM_RIGHTS. When found, | |
6891 | * remove this entry and rearrange the file array. | |
6892 | */ | |
6893 | skb = skb_dequeue(head); | |
6894 | while (skb) { | |
6895 | struct scm_fp_list *fp; | |
6896 | ||
6897 | fp = UNIXCB(skb).fp; | |
6898 | for (i = 0; i < fp->count; i++) { | |
6899 | int left; | |
6900 | ||
6901 | if (fp->fp[i] != file) | |
6902 | continue; | |
6903 | ||
6904 | unix_notinflight(fp->user, fp->fp[i]); | |
6905 | left = fp->count - 1 - i; | |
6906 | if (left) { | |
6907 | memmove(&fp->fp[i], &fp->fp[i + 1], | |
6908 | left * sizeof(struct file *)); | |
6909 | } | |
6910 | fp->count--; | |
6911 | if (!fp->count) { | |
6912 | kfree_skb(skb); | |
6913 | skb = NULL; | |
6914 | } else { | |
6915 | __skb_queue_tail(&list, skb); | |
6916 | } | |
6917 | fput(file); | |
6918 | file = NULL; | |
6919 | break; | |
6920 | } | |
6921 | ||
6922 | if (!file) | |
6923 | break; | |
6924 | ||
6925 | __skb_queue_tail(&list, skb); | |
6926 | ||
6927 | skb = skb_dequeue(head); | |
6928 | } | |
6929 | ||
6930 | if (skb_peek(&list)) { | |
6931 | spin_lock_irq(&head->lock); | |
6932 | while ((skb = __skb_dequeue(&list)) != NULL) | |
6933 | __skb_queue_tail(head, skb); | |
6934 | spin_unlock_irq(&head->lock); | |
6935 | } | |
6936 | #else | |
6937 | fput(file); | |
6938 | #endif | |
6939 | } | |
6940 | ||
6941 | struct io_file_put { | |
05589553 | 6942 | struct list_head list; |
05f3fb3c | 6943 | struct file *file; |
05f3fb3c JA |
6944 | }; |
6945 | ||
4a38aed2 | 6946 | static void __io_file_put_work(struct fixed_file_ref_node *ref_node) |
65e19f54 | 6947 | { |
4a38aed2 JA |
6948 | struct fixed_file_data *file_data = ref_node->file_data; |
6949 | struct io_ring_ctx *ctx = file_data->ctx; | |
05f3fb3c | 6950 | struct io_file_put *pfile, *tmp; |
05589553 XW |
6951 | |
6952 | list_for_each_entry_safe(pfile, tmp, &ref_node->file_list, list) { | |
6a4d07cd | 6953 | list_del(&pfile->list); |
05589553 XW |
6954 | io_ring_file_put(ctx, pfile->file); |
6955 | kfree(pfile); | |
65e19f54 | 6956 | } |
05589553 | 6957 | |
6a4d07cd JA |
6958 | spin_lock(&file_data->lock); |
6959 | list_del(&ref_node->node); | |
6960 | spin_unlock(&file_data->lock); | |
05589553 XW |
6961 | |
6962 | percpu_ref_exit(&ref_node->refs); | |
6963 | kfree(ref_node); | |
6964 | percpu_ref_put(&file_data->refs); | |
2faf852d | 6965 | } |
65e19f54 | 6966 | |
4a38aed2 JA |
6967 | static void io_file_put_work(struct work_struct *work) |
6968 | { | |
6969 | struct io_ring_ctx *ctx; | |
6970 | struct llist_node *node; | |
6971 | ||
6972 | ctx = container_of(work, struct io_ring_ctx, file_put_work.work); | |
6973 | node = llist_del_all(&ctx->file_put_llist); | |
6974 | ||
6975 | while (node) { | |
6976 | struct fixed_file_ref_node *ref_node; | |
6977 | struct llist_node *next = node->next; | |
6978 | ||
6979 | ref_node = llist_entry(node, struct fixed_file_ref_node, llist); | |
6980 | __io_file_put_work(ref_node); | |
6981 | node = next; | |
6982 | } | |
6983 | } | |
6984 | ||
05589553 | 6985 | static void io_file_data_ref_zero(struct percpu_ref *ref) |
2faf852d | 6986 | { |
05589553 | 6987 | struct fixed_file_ref_node *ref_node; |
4a38aed2 JA |
6988 | struct io_ring_ctx *ctx; |
6989 | bool first_add; | |
6990 | int delay = HZ; | |
65e19f54 | 6991 | |
05589553 | 6992 | ref_node = container_of(ref, struct fixed_file_ref_node, refs); |
4a38aed2 | 6993 | ctx = ref_node->file_data->ctx; |
05589553 | 6994 | |
4a38aed2 JA |
6995 | if (percpu_ref_is_dying(&ctx->file_data->refs)) |
6996 | delay = 0; | |
05589553 | 6997 | |
4a38aed2 JA |
6998 | first_add = llist_add(&ref_node->llist, &ctx->file_put_llist); |
6999 | if (!delay) | |
7000 | mod_delayed_work(system_wq, &ctx->file_put_work, 0); | |
7001 | else if (first_add) | |
7002 | queue_delayed_work(system_wq, &ctx->file_put_work, delay); | |
05f3fb3c | 7003 | } |
65e19f54 | 7004 | |
05589553 XW |
7005 | static struct fixed_file_ref_node *alloc_fixed_file_ref_node( |
7006 | struct io_ring_ctx *ctx) | |
05f3fb3c | 7007 | { |
05589553 | 7008 | struct fixed_file_ref_node *ref_node; |
05f3fb3c | 7009 | |
05589553 XW |
7010 | ref_node = kzalloc(sizeof(*ref_node), GFP_KERNEL); |
7011 | if (!ref_node) | |
7012 | return ERR_PTR(-ENOMEM); | |
05f3fb3c | 7013 | |
05589553 XW |
7014 | if (percpu_ref_init(&ref_node->refs, io_file_data_ref_zero, |
7015 | 0, GFP_KERNEL)) { | |
7016 | kfree(ref_node); | |
7017 | return ERR_PTR(-ENOMEM); | |
7018 | } | |
7019 | INIT_LIST_HEAD(&ref_node->node); | |
7020 | INIT_LIST_HEAD(&ref_node->file_list); | |
05589553 XW |
7021 | ref_node->file_data = ctx->file_data; |
7022 | return ref_node; | |
05589553 XW |
7023 | } |
7024 | ||
7025 | static void destroy_fixed_file_ref_node(struct fixed_file_ref_node *ref_node) | |
7026 | { | |
7027 | percpu_ref_exit(&ref_node->refs); | |
7028 | kfree(ref_node); | |
65e19f54 JA |
7029 | } |
7030 | ||
6b06314c JA |
7031 | static int io_sqe_files_register(struct io_ring_ctx *ctx, void __user *arg, |
7032 | unsigned nr_args) | |
7033 | { | |
7034 | __s32 __user *fds = (__s32 __user *) arg; | |
65e19f54 | 7035 | unsigned nr_tables; |
05f3fb3c | 7036 | struct file *file; |
6b06314c JA |
7037 | int fd, ret = 0; |
7038 | unsigned i; | |
05589553 | 7039 | struct fixed_file_ref_node *ref_node; |
6b06314c | 7040 | |
05f3fb3c | 7041 | if (ctx->file_data) |
6b06314c JA |
7042 | return -EBUSY; |
7043 | if (!nr_args) | |
7044 | return -EINVAL; | |
7045 | if (nr_args > IORING_MAX_FIXED_FILES) | |
7046 | return -EMFILE; | |
7047 | ||
05f3fb3c JA |
7048 | ctx->file_data = kzalloc(sizeof(*ctx->file_data), GFP_KERNEL); |
7049 | if (!ctx->file_data) | |
7050 | return -ENOMEM; | |
7051 | ctx->file_data->ctx = ctx; | |
7052 | init_completion(&ctx->file_data->done); | |
05589553 | 7053 | INIT_LIST_HEAD(&ctx->file_data->ref_list); |
f7fe9346 | 7054 | spin_lock_init(&ctx->file_data->lock); |
05f3fb3c | 7055 | |
65e19f54 | 7056 | nr_tables = DIV_ROUND_UP(nr_args, IORING_MAX_FILES_TABLE); |
05f3fb3c JA |
7057 | ctx->file_data->table = kcalloc(nr_tables, |
7058 | sizeof(struct fixed_file_table), | |
65e19f54 | 7059 | GFP_KERNEL); |
05f3fb3c JA |
7060 | if (!ctx->file_data->table) { |
7061 | kfree(ctx->file_data); | |
7062 | ctx->file_data = NULL; | |
6b06314c | 7063 | return -ENOMEM; |
05f3fb3c JA |
7064 | } |
7065 | ||
05589553 | 7066 | if (percpu_ref_init(&ctx->file_data->refs, io_file_ref_kill, |
05f3fb3c JA |
7067 | PERCPU_REF_ALLOW_REINIT, GFP_KERNEL)) { |
7068 | kfree(ctx->file_data->table); | |
7069 | kfree(ctx->file_data); | |
7070 | ctx->file_data = NULL; | |
6b06314c | 7071 | return -ENOMEM; |
05f3fb3c | 7072 | } |
6b06314c | 7073 | |
65e19f54 | 7074 | if (io_sqe_alloc_file_tables(ctx, nr_tables, nr_args)) { |
05f3fb3c JA |
7075 | percpu_ref_exit(&ctx->file_data->refs); |
7076 | kfree(ctx->file_data->table); | |
7077 | kfree(ctx->file_data); | |
7078 | ctx->file_data = NULL; | |
65e19f54 JA |
7079 | return -ENOMEM; |
7080 | } | |
7081 | ||
08a45173 | 7082 | for (i = 0; i < nr_args; i++, ctx->nr_user_files++) { |
65e19f54 JA |
7083 | struct fixed_file_table *table; |
7084 | unsigned index; | |
7085 | ||
6b06314c JA |
7086 | ret = -EFAULT; |
7087 | if (copy_from_user(&fd, &fds[i], sizeof(fd))) | |
7088 | break; | |
08a45173 JA |
7089 | /* allow sparse sets */ |
7090 | if (fd == -1) { | |
7091 | ret = 0; | |
7092 | continue; | |
7093 | } | |
6b06314c | 7094 | |
05f3fb3c | 7095 | table = &ctx->file_data->table[i >> IORING_FILE_TABLE_SHIFT]; |
65e19f54 | 7096 | index = i & IORING_FILE_TABLE_MASK; |
05f3fb3c | 7097 | file = fget(fd); |
6b06314c JA |
7098 | |
7099 | ret = -EBADF; | |
05f3fb3c | 7100 | if (!file) |
6b06314c | 7101 | break; |
05f3fb3c | 7102 | |
6b06314c JA |
7103 | /* |
7104 | * Don't allow io_uring instances to be registered. If UNIX | |
7105 | * isn't enabled, then this causes a reference cycle and this | |
7106 | * instance can never get freed. If UNIX is enabled we'll | |
7107 | * handle it just fine, but there's still no point in allowing | |
7108 | * a ring fd as it doesn't support regular read/write anyway. | |
7109 | */ | |
05f3fb3c JA |
7110 | if (file->f_op == &io_uring_fops) { |
7111 | fput(file); | |
6b06314c JA |
7112 | break; |
7113 | } | |
6b06314c | 7114 | ret = 0; |
05f3fb3c | 7115 | table->files[index] = file; |
6b06314c JA |
7116 | } |
7117 | ||
7118 | if (ret) { | |
65e19f54 | 7119 | for (i = 0; i < ctx->nr_user_files; i++) { |
65e19f54 JA |
7120 | file = io_file_from_index(ctx, i); |
7121 | if (file) | |
7122 | fput(file); | |
7123 | } | |
7124 | for (i = 0; i < nr_tables; i++) | |
05f3fb3c | 7125 | kfree(ctx->file_data->table[i].files); |
6b06314c | 7126 | |
667e57da | 7127 | percpu_ref_exit(&ctx->file_data->refs); |
05f3fb3c JA |
7128 | kfree(ctx->file_data->table); |
7129 | kfree(ctx->file_data); | |
7130 | ctx->file_data = NULL; | |
6b06314c JA |
7131 | ctx->nr_user_files = 0; |
7132 | return ret; | |
7133 | } | |
7134 | ||
7135 | ret = io_sqe_files_scm(ctx); | |
05589553 | 7136 | if (ret) { |
6b06314c | 7137 | io_sqe_files_unregister(ctx); |
05589553 XW |
7138 | return ret; |
7139 | } | |
6b06314c | 7140 | |
05589553 XW |
7141 | ref_node = alloc_fixed_file_ref_node(ctx); |
7142 | if (IS_ERR(ref_node)) { | |
7143 | io_sqe_files_unregister(ctx); | |
7144 | return PTR_ERR(ref_node); | |
7145 | } | |
7146 | ||
7147 | ctx->file_data->cur_refs = &ref_node->refs; | |
6a4d07cd | 7148 | spin_lock(&ctx->file_data->lock); |
05589553 | 7149 | list_add(&ref_node->node, &ctx->file_data->ref_list); |
6a4d07cd | 7150 | spin_unlock(&ctx->file_data->lock); |
05589553 | 7151 | percpu_ref_get(&ctx->file_data->refs); |
6b06314c JA |
7152 | return ret; |
7153 | } | |
7154 | ||
c3a31e60 JA |
7155 | static int io_sqe_file_register(struct io_ring_ctx *ctx, struct file *file, |
7156 | int index) | |
7157 | { | |
7158 | #if defined(CONFIG_UNIX) | |
7159 | struct sock *sock = ctx->ring_sock->sk; | |
7160 | struct sk_buff_head *head = &sock->sk_receive_queue; | |
7161 | struct sk_buff *skb; | |
7162 | ||
7163 | /* | |
7164 | * See if we can merge this file into an existing skb SCM_RIGHTS | |
7165 | * file set. If there's no room, fall back to allocating a new skb | |
7166 | * and filling it in. | |
7167 | */ | |
7168 | spin_lock_irq(&head->lock); | |
7169 | skb = skb_peek(head); | |
7170 | if (skb) { | |
7171 | struct scm_fp_list *fpl = UNIXCB(skb).fp; | |
7172 | ||
7173 | if (fpl->count < SCM_MAX_FD) { | |
7174 | __skb_unlink(skb, head); | |
7175 | spin_unlock_irq(&head->lock); | |
7176 | fpl->fp[fpl->count] = get_file(file); | |
7177 | unix_inflight(fpl->user, fpl->fp[fpl->count]); | |
7178 | fpl->count++; | |
7179 | spin_lock_irq(&head->lock); | |
7180 | __skb_queue_head(head, skb); | |
7181 | } else { | |
7182 | skb = NULL; | |
7183 | } | |
7184 | } | |
7185 | spin_unlock_irq(&head->lock); | |
7186 | ||
7187 | if (skb) { | |
7188 | fput(file); | |
7189 | return 0; | |
7190 | } | |
7191 | ||
7192 | return __io_sqe_files_scm(ctx, 1, index); | |
7193 | #else | |
7194 | return 0; | |
7195 | #endif | |
7196 | } | |
7197 | ||
a5318d3c | 7198 | static int io_queue_file_removal(struct fixed_file_data *data, |
05589553 | 7199 | struct file *file) |
05f3fb3c | 7200 | { |
a5318d3c | 7201 | struct io_file_put *pfile; |
05589553 XW |
7202 | struct percpu_ref *refs = data->cur_refs; |
7203 | struct fixed_file_ref_node *ref_node; | |
05f3fb3c | 7204 | |
05f3fb3c | 7205 | pfile = kzalloc(sizeof(*pfile), GFP_KERNEL); |
a5318d3c HD |
7206 | if (!pfile) |
7207 | return -ENOMEM; | |
05f3fb3c | 7208 | |
05589553 | 7209 | ref_node = container_of(refs, struct fixed_file_ref_node, refs); |
05f3fb3c | 7210 | pfile->file = file; |
05589553 XW |
7211 | list_add(&pfile->list, &ref_node->file_list); |
7212 | ||
a5318d3c | 7213 | return 0; |
05f3fb3c JA |
7214 | } |
7215 | ||
7216 | static int __io_sqe_files_update(struct io_ring_ctx *ctx, | |
7217 | struct io_uring_files_update *up, | |
7218 | unsigned nr_args) | |
7219 | { | |
7220 | struct fixed_file_data *data = ctx->file_data; | |
05589553 | 7221 | struct fixed_file_ref_node *ref_node; |
05f3fb3c | 7222 | struct file *file; |
c3a31e60 JA |
7223 | __s32 __user *fds; |
7224 | int fd, i, err; | |
7225 | __u32 done; | |
05589553 | 7226 | bool needs_switch = false; |
c3a31e60 | 7227 | |
05f3fb3c | 7228 | if (check_add_overflow(up->offset, nr_args, &done)) |
c3a31e60 JA |
7229 | return -EOVERFLOW; |
7230 | if (done > ctx->nr_user_files) | |
7231 | return -EINVAL; | |
7232 | ||
05589553 XW |
7233 | ref_node = alloc_fixed_file_ref_node(ctx); |
7234 | if (IS_ERR(ref_node)) | |
7235 | return PTR_ERR(ref_node); | |
7236 | ||
c3a31e60 | 7237 | done = 0; |
05f3fb3c | 7238 | fds = u64_to_user_ptr(up->fds); |
c3a31e60 | 7239 | while (nr_args) { |
65e19f54 JA |
7240 | struct fixed_file_table *table; |
7241 | unsigned index; | |
7242 | ||
c3a31e60 JA |
7243 | err = 0; |
7244 | if (copy_from_user(&fd, &fds[done], sizeof(fd))) { | |
7245 | err = -EFAULT; | |
7246 | break; | |
7247 | } | |
05f3fb3c JA |
7248 | i = array_index_nospec(up->offset, ctx->nr_user_files); |
7249 | table = &ctx->file_data->table[i >> IORING_FILE_TABLE_SHIFT]; | |
65e19f54 JA |
7250 | index = i & IORING_FILE_TABLE_MASK; |
7251 | if (table->files[index]) { | |
05f3fb3c | 7252 | file = io_file_from_index(ctx, index); |
a5318d3c HD |
7253 | err = io_queue_file_removal(data, file); |
7254 | if (err) | |
7255 | break; | |
65e19f54 | 7256 | table->files[index] = NULL; |
05589553 | 7257 | needs_switch = true; |
c3a31e60 JA |
7258 | } |
7259 | if (fd != -1) { | |
c3a31e60 JA |
7260 | file = fget(fd); |
7261 | if (!file) { | |
7262 | err = -EBADF; | |
7263 | break; | |
7264 | } | |
7265 | /* | |
7266 | * Don't allow io_uring instances to be registered. If | |
7267 | * UNIX isn't enabled, then this causes a reference | |
7268 | * cycle and this instance can never get freed. If UNIX | |
7269 | * is enabled we'll handle it just fine, but there's | |
7270 | * still no point in allowing a ring fd as it doesn't | |
7271 | * support regular read/write anyway. | |
7272 | */ | |
7273 | if (file->f_op == &io_uring_fops) { | |
7274 | fput(file); | |
7275 | err = -EBADF; | |
7276 | break; | |
7277 | } | |
65e19f54 | 7278 | table->files[index] = file; |
c3a31e60 | 7279 | err = io_sqe_file_register(ctx, file, i); |
f3bd9dae YY |
7280 | if (err) { |
7281 | fput(file); | |
c3a31e60 | 7282 | break; |
f3bd9dae | 7283 | } |
c3a31e60 JA |
7284 | } |
7285 | nr_args--; | |
7286 | done++; | |
05f3fb3c JA |
7287 | up->offset++; |
7288 | } | |
7289 | ||
05589553 XW |
7290 | if (needs_switch) { |
7291 | percpu_ref_kill(data->cur_refs); | |
6a4d07cd | 7292 | spin_lock(&data->lock); |
05589553 XW |
7293 | list_add(&ref_node->node, &data->ref_list); |
7294 | data->cur_refs = &ref_node->refs; | |
6a4d07cd | 7295 | spin_unlock(&data->lock); |
05589553 XW |
7296 | percpu_ref_get(&ctx->file_data->refs); |
7297 | } else | |
7298 | destroy_fixed_file_ref_node(ref_node); | |
c3a31e60 JA |
7299 | |
7300 | return done ? done : err; | |
7301 | } | |
05589553 | 7302 | |
05f3fb3c JA |
7303 | static int io_sqe_files_update(struct io_ring_ctx *ctx, void __user *arg, |
7304 | unsigned nr_args) | |
7305 | { | |
7306 | struct io_uring_files_update up; | |
7307 | ||
7308 | if (!ctx->file_data) | |
7309 | return -ENXIO; | |
7310 | if (!nr_args) | |
7311 | return -EINVAL; | |
7312 | if (copy_from_user(&up, arg, sizeof(up))) | |
7313 | return -EFAULT; | |
7314 | if (up.resv) | |
7315 | return -EINVAL; | |
7316 | ||
7317 | return __io_sqe_files_update(ctx, &up, nr_args); | |
7318 | } | |
c3a31e60 | 7319 | |
e9fd9396 | 7320 | static void io_free_work(struct io_wq_work *work) |
7d723065 JA |
7321 | { |
7322 | struct io_kiocb *req = container_of(work, struct io_kiocb, work); | |
7323 | ||
e9fd9396 | 7324 | /* Consider that io_steal_work() relies on this ref */ |
7d723065 JA |
7325 | io_put_req(req); |
7326 | } | |
7327 | ||
24369c2e PB |
7328 | static int io_init_wq_offload(struct io_ring_ctx *ctx, |
7329 | struct io_uring_params *p) | |
7330 | { | |
7331 | struct io_wq_data data; | |
7332 | struct fd f; | |
7333 | struct io_ring_ctx *ctx_attach; | |
7334 | unsigned int concurrency; | |
7335 | int ret = 0; | |
7336 | ||
7337 | data.user = ctx->user; | |
e9fd9396 | 7338 | data.free_work = io_free_work; |
f5fa38c5 | 7339 | data.do_work = io_wq_submit_work; |
24369c2e PB |
7340 | |
7341 | if (!(p->flags & IORING_SETUP_ATTACH_WQ)) { | |
7342 | /* Do QD, or 4 * CPUS, whatever is smallest */ | |
7343 | concurrency = min(ctx->sq_entries, 4 * num_online_cpus()); | |
7344 | ||
7345 | ctx->io_wq = io_wq_create(concurrency, &data); | |
7346 | if (IS_ERR(ctx->io_wq)) { | |
7347 | ret = PTR_ERR(ctx->io_wq); | |
7348 | ctx->io_wq = NULL; | |
7349 | } | |
7350 | return ret; | |
7351 | } | |
7352 | ||
7353 | f = fdget(p->wq_fd); | |
7354 | if (!f.file) | |
7355 | return -EBADF; | |
7356 | ||
7357 | if (f.file->f_op != &io_uring_fops) { | |
7358 | ret = -EINVAL; | |
7359 | goto out_fput; | |
7360 | } | |
7361 | ||
7362 | ctx_attach = f.file->private_data; | |
7363 | /* @io_wq is protected by holding the fd */ | |
7364 | if (!io_wq_get(ctx_attach->io_wq, &data)) { | |
7365 | ret = -EINVAL; | |
7366 | goto out_fput; | |
7367 | } | |
7368 | ||
7369 | ctx->io_wq = ctx_attach->io_wq; | |
7370 | out_fput: | |
7371 | fdput(f); | |
7372 | return ret; | |
7373 | } | |
7374 | ||
6c271ce2 JA |
7375 | static int io_sq_offload_start(struct io_ring_ctx *ctx, |
7376 | struct io_uring_params *p) | |
2b188cc1 JA |
7377 | { |
7378 | int ret; | |
7379 | ||
7380 | mmgrab(current->mm); | |
7381 | ctx->sqo_mm = current->mm; | |
7382 | ||
6c271ce2 | 7383 | if (ctx->flags & IORING_SETUP_SQPOLL) { |
3ec482d1 JA |
7384 | ret = -EPERM; |
7385 | if (!capable(CAP_SYS_ADMIN)) | |
7386 | goto err; | |
7387 | ||
917257da JA |
7388 | ctx->sq_thread_idle = msecs_to_jiffies(p->sq_thread_idle); |
7389 | if (!ctx->sq_thread_idle) | |
7390 | ctx->sq_thread_idle = HZ; | |
7391 | ||
6c271ce2 | 7392 | if (p->flags & IORING_SETUP_SQ_AFF) { |
44a9bd18 | 7393 | int cpu = p->sq_thread_cpu; |
6c271ce2 | 7394 | |
917257da | 7395 | ret = -EINVAL; |
44a9bd18 JA |
7396 | if (cpu >= nr_cpu_ids) |
7397 | goto err; | |
7889f44d | 7398 | if (!cpu_online(cpu)) |
917257da JA |
7399 | goto err; |
7400 | ||
6c271ce2 JA |
7401 | ctx->sqo_thread = kthread_create_on_cpu(io_sq_thread, |
7402 | ctx, cpu, | |
7403 | "io_uring-sq"); | |
7404 | } else { | |
7405 | ctx->sqo_thread = kthread_create(io_sq_thread, ctx, | |
7406 | "io_uring-sq"); | |
7407 | } | |
7408 | if (IS_ERR(ctx->sqo_thread)) { | |
7409 | ret = PTR_ERR(ctx->sqo_thread); | |
7410 | ctx->sqo_thread = NULL; | |
7411 | goto err; | |
7412 | } | |
7413 | wake_up_process(ctx->sqo_thread); | |
7414 | } else if (p->flags & IORING_SETUP_SQ_AFF) { | |
7415 | /* Can't have SQ_AFF without SQPOLL */ | |
7416 | ret = -EINVAL; | |
7417 | goto err; | |
7418 | } | |
7419 | ||
24369c2e PB |
7420 | ret = io_init_wq_offload(ctx, p); |
7421 | if (ret) | |
2b188cc1 | 7422 | goto err; |
2b188cc1 JA |
7423 | |
7424 | return 0; | |
7425 | err: | |
54a91f3b | 7426 | io_finish_async(ctx); |
8eb06d7e PB |
7427 | if (ctx->sqo_mm) { |
7428 | mmdrop(ctx->sqo_mm); | |
7429 | ctx->sqo_mm = NULL; | |
7430 | } | |
2b188cc1 JA |
7431 | return ret; |
7432 | } | |
7433 | ||
a087e2b5 BM |
7434 | static inline void __io_unaccount_mem(struct user_struct *user, |
7435 | unsigned long nr_pages) | |
2b188cc1 JA |
7436 | { |
7437 | atomic_long_sub(nr_pages, &user->locked_vm); | |
7438 | } | |
7439 | ||
a087e2b5 BM |
7440 | static inline int __io_account_mem(struct user_struct *user, |
7441 | unsigned long nr_pages) | |
2b188cc1 JA |
7442 | { |
7443 | unsigned long page_limit, cur_pages, new_pages; | |
7444 | ||
7445 | /* Don't allow more pages than we can safely lock */ | |
7446 | page_limit = rlimit(RLIMIT_MEMLOCK) >> PAGE_SHIFT; | |
7447 | ||
7448 | do { | |
7449 | cur_pages = atomic_long_read(&user->locked_vm); | |
7450 | new_pages = cur_pages + nr_pages; | |
7451 | if (new_pages > page_limit) | |
7452 | return -ENOMEM; | |
7453 | } while (atomic_long_cmpxchg(&user->locked_vm, cur_pages, | |
7454 | new_pages) != cur_pages); | |
7455 | ||
7456 | return 0; | |
7457 | } | |
7458 | ||
2e0464d4 BM |
7459 | static void io_unaccount_mem(struct io_ring_ctx *ctx, unsigned long nr_pages, |
7460 | enum io_mem_account acct) | |
a087e2b5 | 7461 | { |
aad5d8da | 7462 | if (ctx->limit_mem) |
a087e2b5 | 7463 | __io_unaccount_mem(ctx->user, nr_pages); |
30975825 | 7464 | |
2e0464d4 BM |
7465 | if (ctx->sqo_mm) { |
7466 | if (acct == ACCT_LOCKED) | |
7467 | ctx->sqo_mm->locked_vm -= nr_pages; | |
7468 | else if (acct == ACCT_PINNED) | |
7469 | atomic64_sub(nr_pages, &ctx->sqo_mm->pinned_vm); | |
7470 | } | |
a087e2b5 BM |
7471 | } |
7472 | ||
2e0464d4 BM |
7473 | static int io_account_mem(struct io_ring_ctx *ctx, unsigned long nr_pages, |
7474 | enum io_mem_account acct) | |
a087e2b5 | 7475 | { |
30975825 BM |
7476 | int ret; |
7477 | ||
7478 | if (ctx->limit_mem) { | |
7479 | ret = __io_account_mem(ctx->user, nr_pages); | |
7480 | if (ret) | |
7481 | return ret; | |
7482 | } | |
7483 | ||
2e0464d4 BM |
7484 | if (ctx->sqo_mm) { |
7485 | if (acct == ACCT_LOCKED) | |
7486 | ctx->sqo_mm->locked_vm += nr_pages; | |
7487 | else if (acct == ACCT_PINNED) | |
7488 | atomic64_add(nr_pages, &ctx->sqo_mm->pinned_vm); | |
7489 | } | |
a087e2b5 BM |
7490 | |
7491 | return 0; | |
7492 | } | |
7493 | ||
2b188cc1 JA |
7494 | static void io_mem_free(void *ptr) |
7495 | { | |
52e04ef4 MR |
7496 | struct page *page; |
7497 | ||
7498 | if (!ptr) | |
7499 | return; | |
2b188cc1 | 7500 | |
52e04ef4 | 7501 | page = virt_to_head_page(ptr); |
2b188cc1 JA |
7502 | if (put_page_testzero(page)) |
7503 | free_compound_page(page); | |
7504 | } | |
7505 | ||
7506 | static void *io_mem_alloc(size_t size) | |
7507 | { | |
7508 | gfp_t gfp_flags = GFP_KERNEL | __GFP_ZERO | __GFP_NOWARN | __GFP_COMP | | |
7509 | __GFP_NORETRY; | |
7510 | ||
7511 | return (void *) __get_free_pages(gfp_flags, get_order(size)); | |
7512 | } | |
7513 | ||
75b28aff HV |
7514 | static unsigned long rings_size(unsigned sq_entries, unsigned cq_entries, |
7515 | size_t *sq_offset) | |
7516 | { | |
7517 | struct io_rings *rings; | |
7518 | size_t off, sq_array_size; | |
7519 | ||
7520 | off = struct_size(rings, cqes, cq_entries); | |
7521 | if (off == SIZE_MAX) | |
7522 | return SIZE_MAX; | |
7523 | ||
7524 | #ifdef CONFIG_SMP | |
7525 | off = ALIGN(off, SMP_CACHE_BYTES); | |
7526 | if (off == 0) | |
7527 | return SIZE_MAX; | |
7528 | #endif | |
7529 | ||
b36200f5 DV |
7530 | if (sq_offset) |
7531 | *sq_offset = off; | |
7532 | ||
75b28aff HV |
7533 | sq_array_size = array_size(sizeof(u32), sq_entries); |
7534 | if (sq_array_size == SIZE_MAX) | |
7535 | return SIZE_MAX; | |
7536 | ||
7537 | if (check_add_overflow(off, sq_array_size, &off)) | |
7538 | return SIZE_MAX; | |
7539 | ||
75b28aff HV |
7540 | return off; |
7541 | } | |
7542 | ||
2b188cc1 JA |
7543 | static unsigned long ring_pages(unsigned sq_entries, unsigned cq_entries) |
7544 | { | |
75b28aff | 7545 | size_t pages; |
2b188cc1 | 7546 | |
75b28aff HV |
7547 | pages = (size_t)1 << get_order( |
7548 | rings_size(sq_entries, cq_entries, NULL)); | |
7549 | pages += (size_t)1 << get_order( | |
7550 | array_size(sizeof(struct io_uring_sqe), sq_entries)); | |
2b188cc1 | 7551 | |
75b28aff | 7552 | return pages; |
2b188cc1 JA |
7553 | } |
7554 | ||
edafccee JA |
7555 | static int io_sqe_buffer_unregister(struct io_ring_ctx *ctx) |
7556 | { | |
7557 | int i, j; | |
7558 | ||
7559 | if (!ctx->user_bufs) | |
7560 | return -ENXIO; | |
7561 | ||
7562 | for (i = 0; i < ctx->nr_user_bufs; i++) { | |
7563 | struct io_mapped_ubuf *imu = &ctx->user_bufs[i]; | |
7564 | ||
7565 | for (j = 0; j < imu->nr_bvecs; j++) | |
f1f6a7dd | 7566 | unpin_user_page(imu->bvec[j].bv_page); |
edafccee | 7567 | |
2e0464d4 | 7568 | io_unaccount_mem(ctx, imu->nr_bvecs, ACCT_PINNED); |
d4ef6475 | 7569 | kvfree(imu->bvec); |
edafccee JA |
7570 | imu->nr_bvecs = 0; |
7571 | } | |
7572 | ||
7573 | kfree(ctx->user_bufs); | |
7574 | ctx->user_bufs = NULL; | |
7575 | ctx->nr_user_bufs = 0; | |
7576 | return 0; | |
7577 | } | |
7578 | ||
7579 | static int io_copy_iov(struct io_ring_ctx *ctx, struct iovec *dst, | |
7580 | void __user *arg, unsigned index) | |
7581 | { | |
7582 | struct iovec __user *src; | |
7583 | ||
7584 | #ifdef CONFIG_COMPAT | |
7585 | if (ctx->compat) { | |
7586 | struct compat_iovec __user *ciovs; | |
7587 | struct compat_iovec ciov; | |
7588 | ||
7589 | ciovs = (struct compat_iovec __user *) arg; | |
7590 | if (copy_from_user(&ciov, &ciovs[index], sizeof(ciov))) | |
7591 | return -EFAULT; | |
7592 | ||
d55e5f5b | 7593 | dst->iov_base = u64_to_user_ptr((u64)ciov.iov_base); |
edafccee JA |
7594 | dst->iov_len = ciov.iov_len; |
7595 | return 0; | |
7596 | } | |
7597 | #endif | |
7598 | src = (struct iovec __user *) arg; | |
7599 | if (copy_from_user(dst, &src[index], sizeof(*dst))) | |
7600 | return -EFAULT; | |
7601 | return 0; | |
7602 | } | |
7603 | ||
7604 | static int io_sqe_buffer_register(struct io_ring_ctx *ctx, void __user *arg, | |
7605 | unsigned nr_args) | |
7606 | { | |
7607 | struct vm_area_struct **vmas = NULL; | |
7608 | struct page **pages = NULL; | |
7609 | int i, j, got_pages = 0; | |
7610 | int ret = -EINVAL; | |
7611 | ||
7612 | if (ctx->user_bufs) | |
7613 | return -EBUSY; | |
7614 | if (!nr_args || nr_args > UIO_MAXIOV) | |
7615 | return -EINVAL; | |
7616 | ||
7617 | ctx->user_bufs = kcalloc(nr_args, sizeof(struct io_mapped_ubuf), | |
7618 | GFP_KERNEL); | |
7619 | if (!ctx->user_bufs) | |
7620 | return -ENOMEM; | |
7621 | ||
7622 | for (i = 0; i < nr_args; i++) { | |
7623 | struct io_mapped_ubuf *imu = &ctx->user_bufs[i]; | |
7624 | unsigned long off, start, end, ubuf; | |
7625 | int pret, nr_pages; | |
7626 | struct iovec iov; | |
7627 | size_t size; | |
7628 | ||
7629 | ret = io_copy_iov(ctx, &iov, arg, i); | |
7630 | if (ret) | |
a278682d | 7631 | goto err; |
edafccee JA |
7632 | |
7633 | /* | |
7634 | * Don't impose further limits on the size and buffer | |
7635 | * constraints here, we'll -EINVAL later when IO is | |
7636 | * submitted if they are wrong. | |
7637 | */ | |
7638 | ret = -EFAULT; | |
7639 | if (!iov.iov_base || !iov.iov_len) | |
7640 | goto err; | |
7641 | ||
7642 | /* arbitrary limit, but we need something */ | |
7643 | if (iov.iov_len > SZ_1G) | |
7644 | goto err; | |
7645 | ||
7646 | ubuf = (unsigned long) iov.iov_base; | |
7647 | end = (ubuf + iov.iov_len + PAGE_SIZE - 1) >> PAGE_SHIFT; | |
7648 | start = ubuf >> PAGE_SHIFT; | |
7649 | nr_pages = end - start; | |
7650 | ||
2e0464d4 | 7651 | ret = io_account_mem(ctx, nr_pages, ACCT_PINNED); |
a087e2b5 BM |
7652 | if (ret) |
7653 | goto err; | |
edafccee JA |
7654 | |
7655 | ret = 0; | |
7656 | if (!pages || nr_pages > got_pages) { | |
a8c73c1a DE |
7657 | kvfree(vmas); |
7658 | kvfree(pages); | |
d4ef6475 | 7659 | pages = kvmalloc_array(nr_pages, sizeof(struct page *), |
edafccee | 7660 | GFP_KERNEL); |
d4ef6475 | 7661 | vmas = kvmalloc_array(nr_pages, |
edafccee JA |
7662 | sizeof(struct vm_area_struct *), |
7663 | GFP_KERNEL); | |
7664 | if (!pages || !vmas) { | |
7665 | ret = -ENOMEM; | |
2e0464d4 | 7666 | io_unaccount_mem(ctx, nr_pages, ACCT_PINNED); |
edafccee JA |
7667 | goto err; |
7668 | } | |
7669 | got_pages = nr_pages; | |
7670 | } | |
7671 | ||
d4ef6475 | 7672 | imu->bvec = kvmalloc_array(nr_pages, sizeof(struct bio_vec), |
edafccee JA |
7673 | GFP_KERNEL); |
7674 | ret = -ENOMEM; | |
7675 | if (!imu->bvec) { | |
2e0464d4 | 7676 | io_unaccount_mem(ctx, nr_pages, ACCT_PINNED); |
edafccee JA |
7677 | goto err; |
7678 | } | |
7679 | ||
7680 | ret = 0; | |
d8ed45c5 | 7681 | mmap_read_lock(current->mm); |
2113b05d | 7682 | pret = pin_user_pages(ubuf, nr_pages, |
932f4a63 IW |
7683 | FOLL_WRITE | FOLL_LONGTERM, |
7684 | pages, vmas); | |
edafccee JA |
7685 | if (pret == nr_pages) { |
7686 | /* don't support file backed memory */ | |
7687 | for (j = 0; j < nr_pages; j++) { | |
7688 | struct vm_area_struct *vma = vmas[j]; | |
7689 | ||
7690 | if (vma->vm_file && | |
7691 | !is_file_hugepages(vma->vm_file)) { | |
7692 | ret = -EOPNOTSUPP; | |
7693 | break; | |
7694 | } | |
7695 | } | |
7696 | } else { | |
7697 | ret = pret < 0 ? pret : -EFAULT; | |
7698 | } | |
d8ed45c5 | 7699 | mmap_read_unlock(current->mm); |
edafccee JA |
7700 | if (ret) { |
7701 | /* | |
7702 | * if we did partial map, or found file backed vmas, | |
7703 | * release any pages we did get | |
7704 | */ | |
27c4d3a3 | 7705 | if (pret > 0) |
f1f6a7dd | 7706 | unpin_user_pages(pages, pret); |
2e0464d4 | 7707 | io_unaccount_mem(ctx, nr_pages, ACCT_PINNED); |
d4ef6475 | 7708 | kvfree(imu->bvec); |
edafccee JA |
7709 | goto err; |
7710 | } | |
7711 | ||
7712 | off = ubuf & ~PAGE_MASK; | |
7713 | size = iov.iov_len; | |
7714 | for (j = 0; j < nr_pages; j++) { | |
7715 | size_t vec_len; | |
7716 | ||
7717 | vec_len = min_t(size_t, size, PAGE_SIZE - off); | |
7718 | imu->bvec[j].bv_page = pages[j]; | |
7719 | imu->bvec[j].bv_len = vec_len; | |
7720 | imu->bvec[j].bv_offset = off; | |
7721 | off = 0; | |
7722 | size -= vec_len; | |
7723 | } | |
7724 | /* store original address for later verification */ | |
7725 | imu->ubuf = ubuf; | |
7726 | imu->len = iov.iov_len; | |
7727 | imu->nr_bvecs = nr_pages; | |
7728 | ||
7729 | ctx->nr_user_bufs++; | |
7730 | } | |
d4ef6475 MR |
7731 | kvfree(pages); |
7732 | kvfree(vmas); | |
edafccee JA |
7733 | return 0; |
7734 | err: | |
d4ef6475 MR |
7735 | kvfree(pages); |
7736 | kvfree(vmas); | |
edafccee JA |
7737 | io_sqe_buffer_unregister(ctx); |
7738 | return ret; | |
7739 | } | |
7740 | ||
9b402849 JA |
7741 | static int io_eventfd_register(struct io_ring_ctx *ctx, void __user *arg) |
7742 | { | |
7743 | __s32 __user *fds = arg; | |
7744 | int fd; | |
7745 | ||
7746 | if (ctx->cq_ev_fd) | |
7747 | return -EBUSY; | |
7748 | ||
7749 | if (copy_from_user(&fd, fds, sizeof(*fds))) | |
7750 | return -EFAULT; | |
7751 | ||
7752 | ctx->cq_ev_fd = eventfd_ctx_fdget(fd); | |
7753 | if (IS_ERR(ctx->cq_ev_fd)) { | |
7754 | int ret = PTR_ERR(ctx->cq_ev_fd); | |
7755 | ctx->cq_ev_fd = NULL; | |
7756 | return ret; | |
7757 | } | |
7758 | ||
7759 | return 0; | |
7760 | } | |
7761 | ||
7762 | static int io_eventfd_unregister(struct io_ring_ctx *ctx) | |
7763 | { | |
7764 | if (ctx->cq_ev_fd) { | |
7765 | eventfd_ctx_put(ctx->cq_ev_fd); | |
7766 | ctx->cq_ev_fd = NULL; | |
7767 | return 0; | |
7768 | } | |
7769 | ||
7770 | return -ENXIO; | |
7771 | } | |
7772 | ||
5a2e745d JA |
7773 | static int __io_destroy_buffers(int id, void *p, void *data) |
7774 | { | |
7775 | struct io_ring_ctx *ctx = data; | |
7776 | struct io_buffer *buf = p; | |
7777 | ||
067524e9 | 7778 | __io_remove_buffers(ctx, buf, id, -1U); |
5a2e745d JA |
7779 | return 0; |
7780 | } | |
7781 | ||
7782 | static void io_destroy_buffers(struct io_ring_ctx *ctx) | |
7783 | { | |
7784 | idr_for_each(&ctx->io_buffer_idr, __io_destroy_buffers, ctx); | |
7785 | idr_destroy(&ctx->io_buffer_idr); | |
7786 | } | |
7787 | ||
2b188cc1 JA |
7788 | static void io_ring_ctx_free(struct io_ring_ctx *ctx) |
7789 | { | |
6b06314c | 7790 | io_finish_async(ctx); |
5dbcad51 | 7791 | io_sqe_buffer_unregister(ctx); |
30975825 | 7792 | if (ctx->sqo_mm) { |
2b188cc1 | 7793 | mmdrop(ctx->sqo_mm); |
30975825 BM |
7794 | ctx->sqo_mm = NULL; |
7795 | } | |
def596e9 | 7796 | |
6b06314c | 7797 | io_sqe_files_unregister(ctx); |
9b402849 | 7798 | io_eventfd_unregister(ctx); |
5a2e745d | 7799 | io_destroy_buffers(ctx); |
41726c9a | 7800 | idr_destroy(&ctx->personality_idr); |
def596e9 | 7801 | |
2b188cc1 | 7802 | #if defined(CONFIG_UNIX) |
355e8d26 EB |
7803 | if (ctx->ring_sock) { |
7804 | ctx->ring_sock->file = NULL; /* so that iput() is called */ | |
2b188cc1 | 7805 | sock_release(ctx->ring_sock); |
355e8d26 | 7806 | } |
2b188cc1 JA |
7807 | #endif |
7808 | ||
75b28aff | 7809 | io_mem_free(ctx->rings); |
2b188cc1 | 7810 | io_mem_free(ctx->sq_sqes); |
2b188cc1 JA |
7811 | |
7812 | percpu_ref_exit(&ctx->refs); | |
2b188cc1 | 7813 | free_uid(ctx->user); |
181e448d | 7814 | put_cred(ctx->creds); |
78076bb6 | 7815 | kfree(ctx->cancel_hash); |
0ddf92e8 | 7816 | kmem_cache_free(req_cachep, ctx->fallback_req); |
2b188cc1 JA |
7817 | kfree(ctx); |
7818 | } | |
7819 | ||
7820 | static __poll_t io_uring_poll(struct file *file, poll_table *wait) | |
7821 | { | |
7822 | struct io_ring_ctx *ctx = file->private_data; | |
7823 | __poll_t mask = 0; | |
7824 | ||
7825 | poll_wait(file, &ctx->cq_wait, wait); | |
4f7067c3 SB |
7826 | /* |
7827 | * synchronizes with barrier from wq_has_sleeper call in | |
7828 | * io_commit_cqring | |
7829 | */ | |
2b188cc1 | 7830 | smp_rmb(); |
75b28aff HV |
7831 | if (READ_ONCE(ctx->rings->sq.tail) - ctx->cached_sq_head != |
7832 | ctx->rings->sq_ring_entries) | |
2b188cc1 | 7833 | mask |= EPOLLOUT | EPOLLWRNORM; |
63e5d81f | 7834 | if (io_cqring_events(ctx, false)) |
2b188cc1 JA |
7835 | mask |= EPOLLIN | EPOLLRDNORM; |
7836 | ||
7837 | return mask; | |
7838 | } | |
7839 | ||
7840 | static int io_uring_fasync(int fd, struct file *file, int on) | |
7841 | { | |
7842 | struct io_ring_ctx *ctx = file->private_data; | |
7843 | ||
7844 | return fasync_helper(fd, file, on, &ctx->cq_fasync); | |
7845 | } | |
7846 | ||
071698e1 JA |
7847 | static int io_remove_personalities(int id, void *p, void *data) |
7848 | { | |
7849 | struct io_ring_ctx *ctx = data; | |
7850 | const struct cred *cred; | |
7851 | ||
7852 | cred = idr_remove(&ctx->personality_idr, id); | |
7853 | if (cred) | |
7854 | put_cred(cred); | |
7855 | return 0; | |
7856 | } | |
7857 | ||
85faa7b8 JA |
7858 | static void io_ring_exit_work(struct work_struct *work) |
7859 | { | |
b2edc0a7 PB |
7860 | struct io_ring_ctx *ctx = container_of(work, struct io_ring_ctx, |
7861 | exit_work); | |
85faa7b8 | 7862 | |
56952e91 JA |
7863 | /* |
7864 | * If we're doing polled IO and end up having requests being | |
7865 | * submitted async (out-of-line), then completions can come in while | |
7866 | * we're waiting for refs to drop. We need to reap these manually, | |
7867 | * as nobody else will be looking for them. | |
7868 | */ | |
b2edc0a7 | 7869 | do { |
56952e91 JA |
7870 | if (ctx->rings) |
7871 | io_cqring_overflow_flush(ctx, true); | |
b2edc0a7 PB |
7872 | io_iopoll_try_reap_events(ctx); |
7873 | } while (!wait_for_completion_timeout(&ctx->ref_comp, HZ/20)); | |
85faa7b8 JA |
7874 | io_ring_ctx_free(ctx); |
7875 | } | |
7876 | ||
2b188cc1 JA |
7877 | static void io_ring_ctx_wait_and_kill(struct io_ring_ctx *ctx) |
7878 | { | |
7879 | mutex_lock(&ctx->uring_lock); | |
7880 | percpu_ref_kill(&ctx->refs); | |
7881 | mutex_unlock(&ctx->uring_lock); | |
7882 | ||
5262f567 | 7883 | io_kill_timeouts(ctx); |
221c5eb2 | 7884 | io_poll_remove_all(ctx); |
561fb04a JA |
7885 | |
7886 | if (ctx->io_wq) | |
7887 | io_wq_cancel_all(ctx->io_wq); | |
7888 | ||
15dff286 JA |
7889 | /* if we failed setting up the ctx, we might not have any rings */ |
7890 | if (ctx->rings) | |
7891 | io_cqring_overflow_flush(ctx, true); | |
b2edc0a7 | 7892 | io_iopoll_try_reap_events(ctx); |
071698e1 | 7893 | idr_for_each(&ctx->personality_idr, io_remove_personalities, ctx); |
309fc03a JA |
7894 | |
7895 | /* | |
7896 | * Do this upfront, so we won't have a grace period where the ring | |
7897 | * is closed but resources aren't reaped yet. This can cause | |
7898 | * spurious failure in setting up a new ring. | |
7899 | */ | |
760618f7 JA |
7900 | io_unaccount_mem(ctx, ring_pages(ctx->sq_entries, ctx->cq_entries), |
7901 | ACCT_LOCKED); | |
309fc03a | 7902 | |
85faa7b8 JA |
7903 | INIT_WORK(&ctx->exit_work, io_ring_exit_work); |
7904 | queue_work(system_wq, &ctx->exit_work); | |
2b188cc1 JA |
7905 | } |
7906 | ||
7907 | static int io_uring_release(struct inode *inode, struct file *file) | |
7908 | { | |
7909 | struct io_ring_ctx *ctx = file->private_data; | |
7910 | ||
7911 | file->private_data = NULL; | |
7912 | io_ring_ctx_wait_and_kill(ctx); | |
7913 | return 0; | |
7914 | } | |
7915 | ||
67c4d9e6 PB |
7916 | static bool io_wq_files_match(struct io_wq_work *work, void *data) |
7917 | { | |
7918 | struct files_struct *files = data; | |
7919 | ||
7920 | return work->files == files; | |
7921 | } | |
7922 | ||
fcb323cc JA |
7923 | static void io_uring_cancel_files(struct io_ring_ctx *ctx, |
7924 | struct files_struct *files) | |
7925 | { | |
67c4d9e6 PB |
7926 | if (list_empty_careful(&ctx->inflight_list)) |
7927 | return; | |
7928 | ||
7929 | /* cancel all at once, should be faster than doing it one by one*/ | |
7930 | io_wq_cancel_cb(ctx->io_wq, io_wq_files_match, files, true); | |
7931 | ||
fcb323cc | 7932 | while (!list_empty_careful(&ctx->inflight_list)) { |
d8f1b971 XW |
7933 | struct io_kiocb *cancel_req = NULL, *req; |
7934 | DEFINE_WAIT(wait); | |
fcb323cc JA |
7935 | |
7936 | spin_lock_irq(&ctx->inflight_lock); | |
7937 | list_for_each_entry(req, &ctx->inflight_list, inflight_entry) { | |
768134d4 JA |
7938 | if (req->work.files != files) |
7939 | continue; | |
7940 | /* req is being completed, ignore */ | |
7941 | if (!refcount_inc_not_zero(&req->refs)) | |
7942 | continue; | |
7943 | cancel_req = req; | |
7944 | break; | |
fcb323cc | 7945 | } |
768134d4 | 7946 | if (cancel_req) |
fcb323cc | 7947 | prepare_to_wait(&ctx->inflight_wait, &wait, |
768134d4 | 7948 | TASK_UNINTERRUPTIBLE); |
fcb323cc JA |
7949 | spin_unlock_irq(&ctx->inflight_lock); |
7950 | ||
768134d4 JA |
7951 | /* We need to keep going until we don't find a matching req */ |
7952 | if (!cancel_req) | |
fcb323cc | 7953 | break; |
2f6d9b9d | 7954 | |
2ca10259 JA |
7955 | if (cancel_req->flags & REQ_F_OVERFLOW) { |
7956 | spin_lock_irq(&ctx->completion_lock); | |
40d8ddd4 | 7957 | list_del(&cancel_req->compl.list); |
2ca10259 | 7958 | cancel_req->flags &= ~REQ_F_OVERFLOW; |
2ca10259 | 7959 | |
46930143 | 7960 | io_cqring_mark_overflow(ctx); |
2ca10259 JA |
7961 | WRITE_ONCE(ctx->rings->cq_overflow, |
7962 | atomic_inc_return(&ctx->cached_cq_overflow)); | |
dd9dfcdf | 7963 | io_commit_cqring(ctx); |
b2bd1cf9 | 7964 | spin_unlock_irq(&ctx->completion_lock); |
2ca10259 JA |
7965 | |
7966 | /* | |
7967 | * Put inflight ref and overflow ref. If that's | |
7968 | * all we had, then we're done with this request. | |
7969 | */ | |
7970 | if (refcount_sub_and_test(2, &cancel_req->refs)) { | |
4518a3cc | 7971 | io_free_req(cancel_req); |
d8f1b971 | 7972 | finish_wait(&ctx->inflight_wait, &wait); |
2ca10259 JA |
7973 | continue; |
7974 | } | |
7b53d598 PB |
7975 | } else { |
7976 | io_wq_cancel_work(ctx->io_wq, &cancel_req->work); | |
7977 | io_put_req(cancel_req); | |
2ca10259 JA |
7978 | } |
7979 | ||
fcb323cc | 7980 | schedule(); |
d8f1b971 | 7981 | finish_wait(&ctx->inflight_wait, &wait); |
fcb323cc JA |
7982 | } |
7983 | } | |
7984 | ||
801dd57b | 7985 | static bool io_cancel_task_cb(struct io_wq_work *work, void *data) |
44e728b8 | 7986 | { |
801dd57b PB |
7987 | struct io_kiocb *req = container_of(work, struct io_kiocb, work); |
7988 | struct task_struct *task = data; | |
44e728b8 | 7989 | |
801dd57b | 7990 | return req->task == task; |
44e728b8 PB |
7991 | } |
7992 | ||
fcb323cc JA |
7993 | static int io_uring_flush(struct file *file, void *data) |
7994 | { | |
7995 | struct io_ring_ctx *ctx = file->private_data; | |
7996 | ||
7997 | io_uring_cancel_files(ctx, data); | |
6ab23144 JA |
7998 | |
7999 | /* | |
8000 | * If the task is going away, cancel work it may have pending | |
8001 | */ | |
801dd57b PB |
8002 | if (fatal_signal_pending(current) || (current->flags & PF_EXITING)) |
8003 | io_wq_cancel_cb(ctx->io_wq, io_cancel_task_cb, current, true); | |
6ab23144 | 8004 | |
fcb323cc JA |
8005 | return 0; |
8006 | } | |
8007 | ||
6c5c240e RP |
8008 | static void *io_uring_validate_mmap_request(struct file *file, |
8009 | loff_t pgoff, size_t sz) | |
2b188cc1 | 8010 | { |
2b188cc1 | 8011 | struct io_ring_ctx *ctx = file->private_data; |
6c5c240e | 8012 | loff_t offset = pgoff << PAGE_SHIFT; |
2b188cc1 JA |
8013 | struct page *page; |
8014 | void *ptr; | |
8015 | ||
8016 | switch (offset) { | |
8017 | case IORING_OFF_SQ_RING: | |
75b28aff HV |
8018 | case IORING_OFF_CQ_RING: |
8019 | ptr = ctx->rings; | |
2b188cc1 JA |
8020 | break; |
8021 | case IORING_OFF_SQES: | |
8022 | ptr = ctx->sq_sqes; | |
8023 | break; | |
2b188cc1 | 8024 | default: |
6c5c240e | 8025 | return ERR_PTR(-EINVAL); |
2b188cc1 JA |
8026 | } |
8027 | ||
8028 | page = virt_to_head_page(ptr); | |
a50b854e | 8029 | if (sz > page_size(page)) |
6c5c240e RP |
8030 | return ERR_PTR(-EINVAL); |
8031 | ||
8032 | return ptr; | |
8033 | } | |
8034 | ||
8035 | #ifdef CONFIG_MMU | |
8036 | ||
8037 | static int io_uring_mmap(struct file *file, struct vm_area_struct *vma) | |
8038 | { | |
8039 | size_t sz = vma->vm_end - vma->vm_start; | |
8040 | unsigned long pfn; | |
8041 | void *ptr; | |
8042 | ||
8043 | ptr = io_uring_validate_mmap_request(file, vma->vm_pgoff, sz); | |
8044 | if (IS_ERR(ptr)) | |
8045 | return PTR_ERR(ptr); | |
2b188cc1 JA |
8046 | |
8047 | pfn = virt_to_phys(ptr) >> PAGE_SHIFT; | |
8048 | return remap_pfn_range(vma, vma->vm_start, pfn, sz, vma->vm_page_prot); | |
8049 | } | |
8050 | ||
6c5c240e RP |
8051 | #else /* !CONFIG_MMU */ |
8052 | ||
8053 | static int io_uring_mmap(struct file *file, struct vm_area_struct *vma) | |
8054 | { | |
8055 | return vma->vm_flags & (VM_SHARED | VM_MAYSHARE) ? 0 : -EINVAL; | |
8056 | } | |
8057 | ||
8058 | static unsigned int io_uring_nommu_mmap_capabilities(struct file *file) | |
8059 | { | |
8060 | return NOMMU_MAP_DIRECT | NOMMU_MAP_READ | NOMMU_MAP_WRITE; | |
8061 | } | |
8062 | ||
8063 | static unsigned long io_uring_nommu_get_unmapped_area(struct file *file, | |
8064 | unsigned long addr, unsigned long len, | |
8065 | unsigned long pgoff, unsigned long flags) | |
8066 | { | |
8067 | void *ptr; | |
8068 | ||
8069 | ptr = io_uring_validate_mmap_request(file, pgoff, len); | |
8070 | if (IS_ERR(ptr)) | |
8071 | return PTR_ERR(ptr); | |
8072 | ||
8073 | return (unsigned long) ptr; | |
8074 | } | |
8075 | ||
8076 | #endif /* !CONFIG_MMU */ | |
8077 | ||
2b188cc1 JA |
8078 | SYSCALL_DEFINE6(io_uring_enter, unsigned int, fd, u32, to_submit, |
8079 | u32, min_complete, u32, flags, const sigset_t __user *, sig, | |
8080 | size_t, sigsz) | |
8081 | { | |
8082 | struct io_ring_ctx *ctx; | |
8083 | long ret = -EBADF; | |
8084 | int submitted = 0; | |
8085 | struct fd f; | |
8086 | ||
4c6e277c | 8087 | io_run_task_work(); |
b41e9852 | 8088 | |
6c271ce2 | 8089 | if (flags & ~(IORING_ENTER_GETEVENTS | IORING_ENTER_SQ_WAKEUP)) |
2b188cc1 JA |
8090 | return -EINVAL; |
8091 | ||
8092 | f = fdget(fd); | |
8093 | if (!f.file) | |
8094 | return -EBADF; | |
8095 | ||
8096 | ret = -EOPNOTSUPP; | |
8097 | if (f.file->f_op != &io_uring_fops) | |
8098 | goto out_fput; | |
8099 | ||
8100 | ret = -ENXIO; | |
8101 | ctx = f.file->private_data; | |
8102 | if (!percpu_ref_tryget(&ctx->refs)) | |
8103 | goto out_fput; | |
8104 | ||
6c271ce2 JA |
8105 | /* |
8106 | * For SQ polling, the thread will do all submissions and completions. | |
8107 | * Just return the requested submit count, and wake the thread if | |
8108 | * we were asked to. | |
8109 | */ | |
b2a9eada | 8110 | ret = 0; |
6c271ce2 | 8111 | if (ctx->flags & IORING_SETUP_SQPOLL) { |
c1edbf5f JA |
8112 | if (!list_empty_careful(&ctx->cq_overflow_list)) |
8113 | io_cqring_overflow_flush(ctx, false); | |
6c271ce2 JA |
8114 | if (flags & IORING_ENTER_SQ_WAKEUP) |
8115 | wake_up(&ctx->sqo_wait); | |
8116 | submitted = to_submit; | |
b2a9eada | 8117 | } else if (to_submit) { |
2b188cc1 | 8118 | mutex_lock(&ctx->uring_lock); |
0cdaf760 | 8119 | submitted = io_submit_sqes(ctx, to_submit, f.file, fd); |
2b188cc1 | 8120 | mutex_unlock(&ctx->uring_lock); |
7c504e65 PB |
8121 | |
8122 | if (submitted != to_submit) | |
8123 | goto out; | |
2b188cc1 JA |
8124 | } |
8125 | if (flags & IORING_ENTER_GETEVENTS) { | |
8126 | min_complete = min(min_complete, ctx->cq_entries); | |
8127 | ||
32b2244a XW |
8128 | /* |
8129 | * When SETUP_IOPOLL and SETUP_SQPOLL are both enabled, user | |
8130 | * space applications don't need to do io completion events | |
8131 | * polling again, they can rely on io_sq_thread to do polling | |
8132 | * work, which can reduce cpu usage and uring_lock contention. | |
8133 | */ | |
8134 | if (ctx->flags & IORING_SETUP_IOPOLL && | |
8135 | !(ctx->flags & IORING_SETUP_SQPOLL)) { | |
7668b92a | 8136 | ret = io_iopoll_check(ctx, min_complete); |
def596e9 JA |
8137 | } else { |
8138 | ret = io_cqring_wait(ctx, min_complete, sig, sigsz); | |
8139 | } | |
2b188cc1 JA |
8140 | } |
8141 | ||
7c504e65 | 8142 | out: |
6805b32e | 8143 | percpu_ref_put(&ctx->refs); |
2b188cc1 JA |
8144 | out_fput: |
8145 | fdput(f); | |
8146 | return submitted ? submitted : ret; | |
8147 | } | |
8148 | ||
bebdb65e | 8149 | #ifdef CONFIG_PROC_FS |
87ce955b JA |
8150 | static int io_uring_show_cred(int id, void *p, void *data) |
8151 | { | |
8152 | const struct cred *cred = p; | |
8153 | struct seq_file *m = data; | |
8154 | struct user_namespace *uns = seq_user_ns(m); | |
8155 | struct group_info *gi; | |
8156 | kernel_cap_t cap; | |
8157 | unsigned __capi; | |
8158 | int g; | |
8159 | ||
8160 | seq_printf(m, "%5d\n", id); | |
8161 | seq_put_decimal_ull(m, "\tUid:\t", from_kuid_munged(uns, cred->uid)); | |
8162 | seq_put_decimal_ull(m, "\t\t", from_kuid_munged(uns, cred->euid)); | |
8163 | seq_put_decimal_ull(m, "\t\t", from_kuid_munged(uns, cred->suid)); | |
8164 | seq_put_decimal_ull(m, "\t\t", from_kuid_munged(uns, cred->fsuid)); | |
8165 | seq_put_decimal_ull(m, "\n\tGid:\t", from_kgid_munged(uns, cred->gid)); | |
8166 | seq_put_decimal_ull(m, "\t\t", from_kgid_munged(uns, cred->egid)); | |
8167 | seq_put_decimal_ull(m, "\t\t", from_kgid_munged(uns, cred->sgid)); | |
8168 | seq_put_decimal_ull(m, "\t\t", from_kgid_munged(uns, cred->fsgid)); | |
8169 | seq_puts(m, "\n\tGroups:\t"); | |
8170 | gi = cred->group_info; | |
8171 | for (g = 0; g < gi->ngroups; g++) { | |
8172 | seq_put_decimal_ull(m, g ? " " : "", | |
8173 | from_kgid_munged(uns, gi->gid[g])); | |
8174 | } | |
8175 | seq_puts(m, "\n\tCapEff:\t"); | |
8176 | cap = cred->cap_effective; | |
8177 | CAP_FOR_EACH_U32(__capi) | |
8178 | seq_put_hex_ll(m, NULL, cap.cap[CAP_LAST_U32 - __capi], 8); | |
8179 | seq_putc(m, '\n'); | |
8180 | return 0; | |
8181 | } | |
8182 | ||
8183 | static void __io_uring_show_fdinfo(struct io_ring_ctx *ctx, struct seq_file *m) | |
8184 | { | |
8185 | int i; | |
8186 | ||
8187 | mutex_lock(&ctx->uring_lock); | |
8188 | seq_printf(m, "UserFiles:\t%u\n", ctx->nr_user_files); | |
8189 | for (i = 0; i < ctx->nr_user_files; i++) { | |
8190 | struct fixed_file_table *table; | |
8191 | struct file *f; | |
8192 | ||
8193 | table = &ctx->file_data->table[i >> IORING_FILE_TABLE_SHIFT]; | |
8194 | f = table->files[i & IORING_FILE_TABLE_MASK]; | |
8195 | if (f) | |
8196 | seq_printf(m, "%5u: %s\n", i, file_dentry(f)->d_iname); | |
8197 | else | |
8198 | seq_printf(m, "%5u: <none>\n", i); | |
8199 | } | |
8200 | seq_printf(m, "UserBufs:\t%u\n", ctx->nr_user_bufs); | |
8201 | for (i = 0; i < ctx->nr_user_bufs; i++) { | |
8202 | struct io_mapped_ubuf *buf = &ctx->user_bufs[i]; | |
8203 | ||
8204 | seq_printf(m, "%5u: 0x%llx/%u\n", i, buf->ubuf, | |
8205 | (unsigned int) buf->len); | |
8206 | } | |
8207 | if (!idr_is_empty(&ctx->personality_idr)) { | |
8208 | seq_printf(m, "Personalities:\n"); | |
8209 | idr_for_each(&ctx->personality_idr, io_uring_show_cred, m); | |
8210 | } | |
d7718a9d JA |
8211 | seq_printf(m, "PollList:\n"); |
8212 | spin_lock_irq(&ctx->completion_lock); | |
8213 | for (i = 0; i < (1U << ctx->cancel_hash_bits); i++) { | |
8214 | struct hlist_head *list = &ctx->cancel_hash[i]; | |
8215 | struct io_kiocb *req; | |
8216 | ||
8217 | hlist_for_each_entry(req, list, hash_node) | |
8218 | seq_printf(m, " op=%d, task_works=%d\n", req->opcode, | |
8219 | req->task->task_works != NULL); | |
8220 | } | |
8221 | spin_unlock_irq(&ctx->completion_lock); | |
87ce955b JA |
8222 | mutex_unlock(&ctx->uring_lock); |
8223 | } | |
8224 | ||
8225 | static void io_uring_show_fdinfo(struct seq_file *m, struct file *f) | |
8226 | { | |
8227 | struct io_ring_ctx *ctx = f->private_data; | |
8228 | ||
8229 | if (percpu_ref_tryget(&ctx->refs)) { | |
8230 | __io_uring_show_fdinfo(ctx, m); | |
8231 | percpu_ref_put(&ctx->refs); | |
8232 | } | |
8233 | } | |
bebdb65e | 8234 | #endif |
87ce955b | 8235 | |
2b188cc1 JA |
8236 | static const struct file_operations io_uring_fops = { |
8237 | .release = io_uring_release, | |
fcb323cc | 8238 | .flush = io_uring_flush, |
2b188cc1 | 8239 | .mmap = io_uring_mmap, |
6c5c240e RP |
8240 | #ifndef CONFIG_MMU |
8241 | .get_unmapped_area = io_uring_nommu_get_unmapped_area, | |
8242 | .mmap_capabilities = io_uring_nommu_mmap_capabilities, | |
8243 | #endif | |
2b188cc1 JA |
8244 | .poll = io_uring_poll, |
8245 | .fasync = io_uring_fasync, | |
bebdb65e | 8246 | #ifdef CONFIG_PROC_FS |
87ce955b | 8247 | .show_fdinfo = io_uring_show_fdinfo, |
bebdb65e | 8248 | #endif |
2b188cc1 JA |
8249 | }; |
8250 | ||
8251 | static int io_allocate_scq_urings(struct io_ring_ctx *ctx, | |
8252 | struct io_uring_params *p) | |
8253 | { | |
75b28aff HV |
8254 | struct io_rings *rings; |
8255 | size_t size, sq_array_offset; | |
2b188cc1 | 8256 | |
bd740481 JA |
8257 | /* make sure these are sane, as we already accounted them */ |
8258 | ctx->sq_entries = p->sq_entries; | |
8259 | ctx->cq_entries = p->cq_entries; | |
8260 | ||
75b28aff HV |
8261 | size = rings_size(p->sq_entries, p->cq_entries, &sq_array_offset); |
8262 | if (size == SIZE_MAX) | |
8263 | return -EOVERFLOW; | |
8264 | ||
8265 | rings = io_mem_alloc(size); | |
8266 | if (!rings) | |
2b188cc1 JA |
8267 | return -ENOMEM; |
8268 | ||
75b28aff HV |
8269 | ctx->rings = rings; |
8270 | ctx->sq_array = (u32 *)((char *)rings + sq_array_offset); | |
8271 | rings->sq_ring_mask = p->sq_entries - 1; | |
8272 | rings->cq_ring_mask = p->cq_entries - 1; | |
8273 | rings->sq_ring_entries = p->sq_entries; | |
8274 | rings->cq_ring_entries = p->cq_entries; | |
8275 | ctx->sq_mask = rings->sq_ring_mask; | |
8276 | ctx->cq_mask = rings->cq_ring_mask; | |
2b188cc1 JA |
8277 | |
8278 | size = array_size(sizeof(struct io_uring_sqe), p->sq_entries); | |
eb065d30 JA |
8279 | if (size == SIZE_MAX) { |
8280 | io_mem_free(ctx->rings); | |
8281 | ctx->rings = NULL; | |
2b188cc1 | 8282 | return -EOVERFLOW; |
eb065d30 | 8283 | } |
2b188cc1 JA |
8284 | |
8285 | ctx->sq_sqes = io_mem_alloc(size); | |
eb065d30 JA |
8286 | if (!ctx->sq_sqes) { |
8287 | io_mem_free(ctx->rings); | |
8288 | ctx->rings = NULL; | |
2b188cc1 | 8289 | return -ENOMEM; |
eb065d30 | 8290 | } |
2b188cc1 | 8291 | |
2b188cc1 JA |
8292 | return 0; |
8293 | } | |
8294 | ||
8295 | /* | |
8296 | * Allocate an anonymous fd, this is what constitutes the application | |
8297 | * visible backing of an io_uring instance. The application mmaps this | |
8298 | * fd to gain access to the SQ/CQ ring details. If UNIX sockets are enabled, | |
8299 | * we have to tie this fd to a socket for file garbage collection purposes. | |
8300 | */ | |
8301 | static int io_uring_get_fd(struct io_ring_ctx *ctx) | |
8302 | { | |
8303 | struct file *file; | |
8304 | int ret; | |
8305 | ||
8306 | #if defined(CONFIG_UNIX) | |
8307 | ret = sock_create_kern(&init_net, PF_UNIX, SOCK_RAW, IPPROTO_IP, | |
8308 | &ctx->ring_sock); | |
8309 | if (ret) | |
8310 | return ret; | |
8311 | #endif | |
8312 | ||
8313 | ret = get_unused_fd_flags(O_RDWR | O_CLOEXEC); | |
8314 | if (ret < 0) | |
8315 | goto err; | |
8316 | ||
8317 | file = anon_inode_getfile("[io_uring]", &io_uring_fops, ctx, | |
8318 | O_RDWR | O_CLOEXEC); | |
8319 | if (IS_ERR(file)) { | |
8320 | put_unused_fd(ret); | |
8321 | ret = PTR_ERR(file); | |
8322 | goto err; | |
8323 | } | |
8324 | ||
8325 | #if defined(CONFIG_UNIX) | |
8326 | ctx->ring_sock->file = file; | |
8327 | #endif | |
8328 | fd_install(ret, file); | |
8329 | return ret; | |
8330 | err: | |
8331 | #if defined(CONFIG_UNIX) | |
8332 | sock_release(ctx->ring_sock); | |
8333 | ctx->ring_sock = NULL; | |
8334 | #endif | |
8335 | return ret; | |
8336 | } | |
8337 | ||
7f13657d XW |
8338 | static int io_uring_create(unsigned entries, struct io_uring_params *p, |
8339 | struct io_uring_params __user *params) | |
2b188cc1 JA |
8340 | { |
8341 | struct user_struct *user = NULL; | |
8342 | struct io_ring_ctx *ctx; | |
aad5d8da | 8343 | bool limit_mem; |
2b188cc1 JA |
8344 | int ret; |
8345 | ||
8110c1a6 | 8346 | if (!entries) |
2b188cc1 | 8347 | return -EINVAL; |
8110c1a6 JA |
8348 | if (entries > IORING_MAX_ENTRIES) { |
8349 | if (!(p->flags & IORING_SETUP_CLAMP)) | |
8350 | return -EINVAL; | |
8351 | entries = IORING_MAX_ENTRIES; | |
8352 | } | |
2b188cc1 JA |
8353 | |
8354 | /* | |
8355 | * Use twice as many entries for the CQ ring. It's possible for the | |
8356 | * application to drive a higher depth than the size of the SQ ring, | |
8357 | * since the sqes are only used at submission time. This allows for | |
33a107f0 JA |
8358 | * some flexibility in overcommitting a bit. If the application has |
8359 | * set IORING_SETUP_CQSIZE, it will have passed in the desired number | |
8360 | * of CQ ring entries manually. | |
2b188cc1 JA |
8361 | */ |
8362 | p->sq_entries = roundup_pow_of_two(entries); | |
33a107f0 JA |
8363 | if (p->flags & IORING_SETUP_CQSIZE) { |
8364 | /* | |
8365 | * If IORING_SETUP_CQSIZE is set, we do the same roundup | |
8366 | * to a power-of-two, if it isn't already. We do NOT impose | |
8367 | * any cq vs sq ring sizing. | |
8368 | */ | |
8110c1a6 | 8369 | if (p->cq_entries < p->sq_entries) |
33a107f0 | 8370 | return -EINVAL; |
8110c1a6 JA |
8371 | if (p->cq_entries > IORING_MAX_CQ_ENTRIES) { |
8372 | if (!(p->flags & IORING_SETUP_CLAMP)) | |
8373 | return -EINVAL; | |
8374 | p->cq_entries = IORING_MAX_CQ_ENTRIES; | |
8375 | } | |
33a107f0 JA |
8376 | p->cq_entries = roundup_pow_of_two(p->cq_entries); |
8377 | } else { | |
8378 | p->cq_entries = 2 * p->sq_entries; | |
8379 | } | |
2b188cc1 JA |
8380 | |
8381 | user = get_uid(current_user()); | |
aad5d8da | 8382 | limit_mem = !capable(CAP_IPC_LOCK); |
2b188cc1 | 8383 | |
aad5d8da | 8384 | if (limit_mem) { |
a087e2b5 | 8385 | ret = __io_account_mem(user, |
2b188cc1 JA |
8386 | ring_pages(p->sq_entries, p->cq_entries)); |
8387 | if (ret) { | |
8388 | free_uid(user); | |
8389 | return ret; | |
8390 | } | |
8391 | } | |
8392 | ||
8393 | ctx = io_ring_ctx_alloc(p); | |
8394 | if (!ctx) { | |
aad5d8da | 8395 | if (limit_mem) |
a087e2b5 | 8396 | __io_unaccount_mem(user, ring_pages(p->sq_entries, |
2b188cc1 JA |
8397 | p->cq_entries)); |
8398 | free_uid(user); | |
8399 | return -ENOMEM; | |
8400 | } | |
8401 | ctx->compat = in_compat_syscall(); | |
2b188cc1 | 8402 | ctx->user = user; |
0b8c0ec7 | 8403 | ctx->creds = get_current_cred(); |
2b188cc1 | 8404 | |
f74441e6 JA |
8405 | /* |
8406 | * Account memory _before_ installing the file descriptor. Once | |
8407 | * the descriptor is installed, it can get closed at any time. Also | |
8408 | * do this before hitting the general error path, as ring freeing | |
8409 | * will un-account as well. | |
8410 | */ | |
8411 | io_account_mem(ctx, ring_pages(p->sq_entries, p->cq_entries), | |
8412 | ACCT_LOCKED); | |
8413 | ctx->limit_mem = limit_mem; | |
8414 | ||
2b188cc1 JA |
8415 | ret = io_allocate_scq_urings(ctx, p); |
8416 | if (ret) | |
8417 | goto err; | |
8418 | ||
6c271ce2 | 8419 | ret = io_sq_offload_start(ctx, p); |
2b188cc1 JA |
8420 | if (ret) |
8421 | goto err; | |
8422 | ||
2b188cc1 | 8423 | memset(&p->sq_off, 0, sizeof(p->sq_off)); |
75b28aff HV |
8424 | p->sq_off.head = offsetof(struct io_rings, sq.head); |
8425 | p->sq_off.tail = offsetof(struct io_rings, sq.tail); | |
8426 | p->sq_off.ring_mask = offsetof(struct io_rings, sq_ring_mask); | |
8427 | p->sq_off.ring_entries = offsetof(struct io_rings, sq_ring_entries); | |
8428 | p->sq_off.flags = offsetof(struct io_rings, sq_flags); | |
8429 | p->sq_off.dropped = offsetof(struct io_rings, sq_dropped); | |
8430 | p->sq_off.array = (char *)ctx->sq_array - (char *)ctx->rings; | |
2b188cc1 JA |
8431 | |
8432 | memset(&p->cq_off, 0, sizeof(p->cq_off)); | |
75b28aff HV |
8433 | p->cq_off.head = offsetof(struct io_rings, cq.head); |
8434 | p->cq_off.tail = offsetof(struct io_rings, cq.tail); | |
8435 | p->cq_off.ring_mask = offsetof(struct io_rings, cq_ring_mask); | |
8436 | p->cq_off.ring_entries = offsetof(struct io_rings, cq_ring_entries); | |
8437 | p->cq_off.overflow = offsetof(struct io_rings, cq_overflow); | |
8438 | p->cq_off.cqes = offsetof(struct io_rings, cqes); | |
0d9b5b3a | 8439 | p->cq_off.flags = offsetof(struct io_rings, cq_flags); |
ac90f249 | 8440 | |
7f13657d XW |
8441 | p->features = IORING_FEAT_SINGLE_MMAP | IORING_FEAT_NODROP | |
8442 | IORING_FEAT_SUBMIT_STABLE | IORING_FEAT_RW_CUR_POS | | |
5769a351 JX |
8443 | IORING_FEAT_CUR_PERSONALITY | IORING_FEAT_FAST_POLL | |
8444 | IORING_FEAT_POLL_32BITS; | |
7f13657d XW |
8445 | |
8446 | if (copy_to_user(params, p, sizeof(*p))) { | |
8447 | ret = -EFAULT; | |
8448 | goto err; | |
8449 | } | |
d1719f70 | 8450 | |
044c1ab3 JA |
8451 | /* |
8452 | * Install ring fd as the very last thing, so we don't risk someone | |
8453 | * having closed it before we finish setup | |
8454 | */ | |
8455 | ret = io_uring_get_fd(ctx); | |
8456 | if (ret < 0) | |
8457 | goto err; | |
8458 | ||
c826bd7a | 8459 | trace_io_uring_create(ret, ctx, p->sq_entries, p->cq_entries, p->flags); |
2b188cc1 JA |
8460 | return ret; |
8461 | err: | |
8462 | io_ring_ctx_wait_and_kill(ctx); | |
8463 | return ret; | |
8464 | } | |
8465 | ||
8466 | /* | |
8467 | * Sets up an aio uring context, and returns the fd. Applications asks for a | |
8468 | * ring size, we return the actual sq/cq ring sizes (among other things) in the | |
8469 | * params structure passed in. | |
8470 | */ | |
8471 | static long io_uring_setup(u32 entries, struct io_uring_params __user *params) | |
8472 | { | |
8473 | struct io_uring_params p; | |
2b188cc1 JA |
8474 | int i; |
8475 | ||
8476 | if (copy_from_user(&p, params, sizeof(p))) | |
8477 | return -EFAULT; | |
8478 | for (i = 0; i < ARRAY_SIZE(p.resv); i++) { | |
8479 | if (p.resv[i]) | |
8480 | return -EINVAL; | |
8481 | } | |
8482 | ||
6c271ce2 | 8483 | if (p.flags & ~(IORING_SETUP_IOPOLL | IORING_SETUP_SQPOLL | |
8110c1a6 | 8484 | IORING_SETUP_SQ_AFF | IORING_SETUP_CQSIZE | |
24369c2e | 8485 | IORING_SETUP_CLAMP | IORING_SETUP_ATTACH_WQ)) |
2b188cc1 JA |
8486 | return -EINVAL; |
8487 | ||
7f13657d | 8488 | return io_uring_create(entries, &p, params); |
2b188cc1 JA |
8489 | } |
8490 | ||
8491 | SYSCALL_DEFINE2(io_uring_setup, u32, entries, | |
8492 | struct io_uring_params __user *, params) | |
8493 | { | |
8494 | return io_uring_setup(entries, params); | |
8495 | } | |
8496 | ||
66f4af93 JA |
8497 | static int io_probe(struct io_ring_ctx *ctx, void __user *arg, unsigned nr_args) |
8498 | { | |
8499 | struct io_uring_probe *p; | |
8500 | size_t size; | |
8501 | int i, ret; | |
8502 | ||
8503 | size = struct_size(p, ops, nr_args); | |
8504 | if (size == SIZE_MAX) | |
8505 | return -EOVERFLOW; | |
8506 | p = kzalloc(size, GFP_KERNEL); | |
8507 | if (!p) | |
8508 | return -ENOMEM; | |
8509 | ||
8510 | ret = -EFAULT; | |
8511 | if (copy_from_user(p, arg, size)) | |
8512 | goto out; | |
8513 | ret = -EINVAL; | |
8514 | if (memchr_inv(p, 0, size)) | |
8515 | goto out; | |
8516 | ||
8517 | p->last_op = IORING_OP_LAST - 1; | |
8518 | if (nr_args > IORING_OP_LAST) | |
8519 | nr_args = IORING_OP_LAST; | |
8520 | ||
8521 | for (i = 0; i < nr_args; i++) { | |
8522 | p->ops[i].op = i; | |
8523 | if (!io_op_defs[i].not_supported) | |
8524 | p->ops[i].flags = IO_URING_OP_SUPPORTED; | |
8525 | } | |
8526 | p->ops_len = i; | |
8527 | ||
8528 | ret = 0; | |
8529 | if (copy_to_user(arg, p, size)) | |
8530 | ret = -EFAULT; | |
8531 | out: | |
8532 | kfree(p); | |
8533 | return ret; | |
8534 | } | |
8535 | ||
071698e1 JA |
8536 | static int io_register_personality(struct io_ring_ctx *ctx) |
8537 | { | |
8538 | const struct cred *creds = get_current_cred(); | |
8539 | int id; | |
8540 | ||
8541 | id = idr_alloc_cyclic(&ctx->personality_idr, (void *) creds, 1, | |
8542 | USHRT_MAX, GFP_KERNEL); | |
8543 | if (id < 0) | |
8544 | put_cred(creds); | |
8545 | return id; | |
8546 | } | |
8547 | ||
8548 | static int io_unregister_personality(struct io_ring_ctx *ctx, unsigned id) | |
8549 | { | |
8550 | const struct cred *old_creds; | |
8551 | ||
8552 | old_creds = idr_remove(&ctx->personality_idr, id); | |
8553 | if (old_creds) { | |
8554 | put_cred(old_creds); | |
8555 | return 0; | |
8556 | } | |
8557 | ||
8558 | return -EINVAL; | |
8559 | } | |
8560 | ||
8561 | static bool io_register_op_must_quiesce(int op) | |
8562 | { | |
8563 | switch (op) { | |
8564 | case IORING_UNREGISTER_FILES: | |
8565 | case IORING_REGISTER_FILES_UPDATE: | |
8566 | case IORING_REGISTER_PROBE: | |
8567 | case IORING_REGISTER_PERSONALITY: | |
8568 | case IORING_UNREGISTER_PERSONALITY: | |
8569 | return false; | |
8570 | default: | |
8571 | return true; | |
8572 | } | |
8573 | } | |
8574 | ||
edafccee JA |
8575 | static int __io_uring_register(struct io_ring_ctx *ctx, unsigned opcode, |
8576 | void __user *arg, unsigned nr_args) | |
b19062a5 JA |
8577 | __releases(ctx->uring_lock) |
8578 | __acquires(ctx->uring_lock) | |
edafccee JA |
8579 | { |
8580 | int ret; | |
8581 | ||
35fa71a0 JA |
8582 | /* |
8583 | * We're inside the ring mutex, if the ref is already dying, then | |
8584 | * someone else killed the ctx or is already going through | |
8585 | * io_uring_register(). | |
8586 | */ | |
8587 | if (percpu_ref_is_dying(&ctx->refs)) | |
8588 | return -ENXIO; | |
8589 | ||
071698e1 | 8590 | if (io_register_op_must_quiesce(opcode)) { |
05f3fb3c | 8591 | percpu_ref_kill(&ctx->refs); |
b19062a5 | 8592 | |
05f3fb3c JA |
8593 | /* |
8594 | * Drop uring mutex before waiting for references to exit. If | |
8595 | * another thread is currently inside io_uring_enter() it might | |
8596 | * need to grab the uring_lock to make progress. If we hold it | |
8597 | * here across the drain wait, then we can deadlock. It's safe | |
8598 | * to drop the mutex here, since no new references will come in | |
8599 | * after we've killed the percpu ref. | |
8600 | */ | |
8601 | mutex_unlock(&ctx->uring_lock); | |
0f158b4c | 8602 | ret = wait_for_completion_interruptible(&ctx->ref_comp); |
05f3fb3c | 8603 | mutex_lock(&ctx->uring_lock); |
c150368b JA |
8604 | if (ret) { |
8605 | percpu_ref_resurrect(&ctx->refs); | |
8606 | ret = -EINTR; | |
8607 | goto out; | |
8608 | } | |
05f3fb3c | 8609 | } |
edafccee JA |
8610 | |
8611 | switch (opcode) { | |
8612 | case IORING_REGISTER_BUFFERS: | |
8613 | ret = io_sqe_buffer_register(ctx, arg, nr_args); | |
8614 | break; | |
8615 | case IORING_UNREGISTER_BUFFERS: | |
8616 | ret = -EINVAL; | |
8617 | if (arg || nr_args) | |
8618 | break; | |
8619 | ret = io_sqe_buffer_unregister(ctx); | |
8620 | break; | |
6b06314c JA |
8621 | case IORING_REGISTER_FILES: |
8622 | ret = io_sqe_files_register(ctx, arg, nr_args); | |
8623 | break; | |
8624 | case IORING_UNREGISTER_FILES: | |
8625 | ret = -EINVAL; | |
8626 | if (arg || nr_args) | |
8627 | break; | |
8628 | ret = io_sqe_files_unregister(ctx); | |
8629 | break; | |
c3a31e60 JA |
8630 | case IORING_REGISTER_FILES_UPDATE: |
8631 | ret = io_sqe_files_update(ctx, arg, nr_args); | |
8632 | break; | |
9b402849 | 8633 | case IORING_REGISTER_EVENTFD: |
f2842ab5 | 8634 | case IORING_REGISTER_EVENTFD_ASYNC: |
9b402849 JA |
8635 | ret = -EINVAL; |
8636 | if (nr_args != 1) | |
8637 | break; | |
8638 | ret = io_eventfd_register(ctx, arg); | |
f2842ab5 JA |
8639 | if (ret) |
8640 | break; | |
8641 | if (opcode == IORING_REGISTER_EVENTFD_ASYNC) | |
8642 | ctx->eventfd_async = 1; | |
8643 | else | |
8644 | ctx->eventfd_async = 0; | |
9b402849 JA |
8645 | break; |
8646 | case IORING_UNREGISTER_EVENTFD: | |
8647 | ret = -EINVAL; | |
8648 | if (arg || nr_args) | |
8649 | break; | |
8650 | ret = io_eventfd_unregister(ctx); | |
8651 | break; | |
66f4af93 JA |
8652 | case IORING_REGISTER_PROBE: |
8653 | ret = -EINVAL; | |
8654 | if (!arg || nr_args > 256) | |
8655 | break; | |
8656 | ret = io_probe(ctx, arg, nr_args); | |
8657 | break; | |
071698e1 JA |
8658 | case IORING_REGISTER_PERSONALITY: |
8659 | ret = -EINVAL; | |
8660 | if (arg || nr_args) | |
8661 | break; | |
8662 | ret = io_register_personality(ctx); | |
8663 | break; | |
8664 | case IORING_UNREGISTER_PERSONALITY: | |
8665 | ret = -EINVAL; | |
8666 | if (arg) | |
8667 | break; | |
8668 | ret = io_unregister_personality(ctx, nr_args); | |
8669 | break; | |
edafccee JA |
8670 | default: |
8671 | ret = -EINVAL; | |
8672 | break; | |
8673 | } | |
8674 | ||
071698e1 | 8675 | if (io_register_op_must_quiesce(opcode)) { |
05f3fb3c | 8676 | /* bring the ctx back to life */ |
05f3fb3c | 8677 | percpu_ref_reinit(&ctx->refs); |
c150368b | 8678 | out: |
0f158b4c | 8679 | reinit_completion(&ctx->ref_comp); |
05f3fb3c | 8680 | } |
edafccee JA |
8681 | return ret; |
8682 | } | |
8683 | ||
8684 | SYSCALL_DEFINE4(io_uring_register, unsigned int, fd, unsigned int, opcode, | |
8685 | void __user *, arg, unsigned int, nr_args) | |
8686 | { | |
8687 | struct io_ring_ctx *ctx; | |
8688 | long ret = -EBADF; | |
8689 | struct fd f; | |
8690 | ||
8691 | f = fdget(fd); | |
8692 | if (!f.file) | |
8693 | return -EBADF; | |
8694 | ||
8695 | ret = -EOPNOTSUPP; | |
8696 | if (f.file->f_op != &io_uring_fops) | |
8697 | goto out_fput; | |
8698 | ||
8699 | ctx = f.file->private_data; | |
8700 | ||
8701 | mutex_lock(&ctx->uring_lock); | |
8702 | ret = __io_uring_register(ctx, opcode, arg, nr_args); | |
8703 | mutex_unlock(&ctx->uring_lock); | |
c826bd7a DD |
8704 | trace_io_uring_register(ctx, opcode, ctx->nr_user_files, ctx->nr_user_bufs, |
8705 | ctx->cq_ev_fd != NULL, ret); | |
edafccee JA |
8706 | out_fput: |
8707 | fdput(f); | |
8708 | return ret; | |
8709 | } | |
8710 | ||
2b188cc1 JA |
8711 | static int __init io_uring_init(void) |
8712 | { | |
d7f62e82 SM |
8713 | #define __BUILD_BUG_VERIFY_ELEMENT(stype, eoffset, etype, ename) do { \ |
8714 | BUILD_BUG_ON(offsetof(stype, ename) != eoffset); \ | |
8715 | BUILD_BUG_ON(sizeof(etype) != sizeof_field(stype, ename)); \ | |
8716 | } while (0) | |
8717 | ||
8718 | #define BUILD_BUG_SQE_ELEM(eoffset, etype, ename) \ | |
8719 | __BUILD_BUG_VERIFY_ELEMENT(struct io_uring_sqe, eoffset, etype, ename) | |
8720 | BUILD_BUG_ON(sizeof(struct io_uring_sqe) != 64); | |
8721 | BUILD_BUG_SQE_ELEM(0, __u8, opcode); | |
8722 | BUILD_BUG_SQE_ELEM(1, __u8, flags); | |
8723 | BUILD_BUG_SQE_ELEM(2, __u16, ioprio); | |
8724 | BUILD_BUG_SQE_ELEM(4, __s32, fd); | |
8725 | BUILD_BUG_SQE_ELEM(8, __u64, off); | |
8726 | BUILD_BUG_SQE_ELEM(8, __u64, addr2); | |
8727 | BUILD_BUG_SQE_ELEM(16, __u64, addr); | |
7d67af2c | 8728 | BUILD_BUG_SQE_ELEM(16, __u64, splice_off_in); |
d7f62e82 SM |
8729 | BUILD_BUG_SQE_ELEM(24, __u32, len); |
8730 | BUILD_BUG_SQE_ELEM(28, __kernel_rwf_t, rw_flags); | |
8731 | BUILD_BUG_SQE_ELEM(28, /* compat */ int, rw_flags); | |
8732 | BUILD_BUG_SQE_ELEM(28, /* compat */ __u32, rw_flags); | |
8733 | BUILD_BUG_SQE_ELEM(28, __u32, fsync_flags); | |
5769a351 JX |
8734 | BUILD_BUG_SQE_ELEM(28, /* compat */ __u16, poll_events); |
8735 | BUILD_BUG_SQE_ELEM(28, __u32, poll32_events); | |
d7f62e82 SM |
8736 | BUILD_BUG_SQE_ELEM(28, __u32, sync_range_flags); |
8737 | BUILD_BUG_SQE_ELEM(28, __u32, msg_flags); | |
8738 | BUILD_BUG_SQE_ELEM(28, __u32, timeout_flags); | |
8739 | BUILD_BUG_SQE_ELEM(28, __u32, accept_flags); | |
8740 | BUILD_BUG_SQE_ELEM(28, __u32, cancel_flags); | |
8741 | BUILD_BUG_SQE_ELEM(28, __u32, open_flags); | |
8742 | BUILD_BUG_SQE_ELEM(28, __u32, statx_flags); | |
8743 | BUILD_BUG_SQE_ELEM(28, __u32, fadvise_advice); | |
7d67af2c | 8744 | BUILD_BUG_SQE_ELEM(28, __u32, splice_flags); |
d7f62e82 SM |
8745 | BUILD_BUG_SQE_ELEM(32, __u64, user_data); |
8746 | BUILD_BUG_SQE_ELEM(40, __u16, buf_index); | |
8747 | BUILD_BUG_SQE_ELEM(42, __u16, personality); | |
7d67af2c | 8748 | BUILD_BUG_SQE_ELEM(44, __s32, splice_fd_in); |
d7f62e82 | 8749 | |
d3656344 | 8750 | BUILD_BUG_ON(ARRAY_SIZE(io_op_defs) != IORING_OP_LAST); |
84557871 | 8751 | BUILD_BUG_ON(__REQ_F_LAST_BIT >= 8 * sizeof(int)); |
2b188cc1 JA |
8752 | req_cachep = KMEM_CACHE(io_kiocb, SLAB_HWCACHE_ALIGN | SLAB_PANIC); |
8753 | return 0; | |
8754 | }; | |
8755 | __initcall(io_uring_init); |