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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); | |
6d816e08 | 1824 | struct io_ring_ctx *ctx = req->ctx; |
c40f6379 JA |
1825 | |
1826 | __io_req_task_submit(req); | |
6d816e08 | 1827 | percpu_ref_put(&ctx->refs); |
c40f6379 JA |
1828 | } |
1829 | ||
1830 | static void io_req_task_queue(struct io_kiocb *req) | |
1831 | { | |
c40f6379 JA |
1832 | int ret; |
1833 | ||
1834 | init_task_work(&req->task_work, io_req_task_submit); | |
6d816e08 | 1835 | percpu_ref_get(&req->ctx->refs); |
c40f6379 | 1836 | |
c2c4c83c | 1837 | ret = io_req_task_work_add(req, &req->task_work); |
c40f6379 | 1838 | if (unlikely(ret)) { |
c2c4c83c JA |
1839 | struct task_struct *tsk; |
1840 | ||
c40f6379 JA |
1841 | init_task_work(&req->task_work, io_req_task_cancel); |
1842 | tsk = io_wq_get_task(req->ctx->io_wq); | |
c2c4c83c JA |
1843 | task_work_add(tsk, &req->task_work, 0); |
1844 | wake_up_process(tsk); | |
c40f6379 | 1845 | } |
c40f6379 JA |
1846 | } |
1847 | ||
c3524383 | 1848 | static void io_queue_next(struct io_kiocb *req) |
c69f8dbe | 1849 | { |
9b5f7bd9 | 1850 | struct io_kiocb *nxt = io_req_find_next(req); |
944e58bf PB |
1851 | |
1852 | if (nxt) | |
906a8c3f | 1853 | io_req_task_queue(nxt); |
c69f8dbe JL |
1854 | } |
1855 | ||
c3524383 | 1856 | static void io_free_req(struct io_kiocb *req) |
7a743e22 | 1857 | { |
c3524383 PB |
1858 | io_queue_next(req); |
1859 | __io_free_req(req); | |
1860 | } | |
8766dd51 | 1861 | |
2d6500d4 PB |
1862 | struct req_batch { |
1863 | void *reqs[IO_IOPOLL_BATCH]; | |
1864 | int to_free; | |
7a743e22 | 1865 | |
5af1d13e PB |
1866 | struct task_struct *task; |
1867 | int task_refs; | |
2d6500d4 PB |
1868 | }; |
1869 | ||
5af1d13e PB |
1870 | static inline void io_init_req_batch(struct req_batch *rb) |
1871 | { | |
1872 | rb->to_free = 0; | |
1873 | rb->task_refs = 0; | |
1874 | rb->task = NULL; | |
1875 | } | |
1876 | ||
2d6500d4 PB |
1877 | static void __io_req_free_batch_flush(struct io_ring_ctx *ctx, |
1878 | struct req_batch *rb) | |
1879 | { | |
1880 | kmem_cache_free_bulk(req_cachep, rb->to_free, rb->reqs); | |
1881 | percpu_ref_put_many(&ctx->refs, rb->to_free); | |
1882 | rb->to_free = 0; | |
1883 | } | |
1884 | ||
1885 | static void io_req_free_batch_finish(struct io_ring_ctx *ctx, | |
1886 | struct req_batch *rb) | |
1887 | { | |
1888 | if (rb->to_free) | |
1889 | __io_req_free_batch_flush(ctx, rb); | |
5af1d13e PB |
1890 | if (rb->task) { |
1891 | put_task_struct_many(rb->task, rb->task_refs); | |
1892 | rb->task = NULL; | |
1893 | } | |
2d6500d4 PB |
1894 | } |
1895 | ||
1896 | static void io_req_free_batch(struct req_batch *rb, struct io_kiocb *req) | |
1897 | { | |
1898 | if (unlikely(io_is_fallback_req(req))) { | |
1899 | io_free_req(req); | |
1900 | return; | |
1901 | } | |
1902 | if (req->flags & REQ_F_LINK_HEAD) | |
1903 | io_queue_next(req); | |
1904 | ||
5af1d13e PB |
1905 | if (req->flags & REQ_F_TASK_PINNED) { |
1906 | if (req->task != rb->task) { | |
1907 | if (rb->task) | |
1908 | put_task_struct_many(rb->task, rb->task_refs); | |
1909 | rb->task = req->task; | |
1910 | rb->task_refs = 0; | |
1911 | } | |
1912 | rb->task_refs++; | |
1913 | req->flags &= ~REQ_F_TASK_PINNED; | |
1914 | } | |
1915 | ||
51a4cc11 | 1916 | WARN_ON_ONCE(io_dismantle_req(req)); |
2d6500d4 PB |
1917 | rb->reqs[rb->to_free++] = req; |
1918 | if (unlikely(rb->to_free == ARRAY_SIZE(rb->reqs))) | |
1919 | __io_req_free_batch_flush(req->ctx, rb); | |
7a743e22 PB |
1920 | } |
1921 | ||
ba816ad6 JA |
1922 | /* |
1923 | * Drop reference to request, return next in chain (if there is one) if this | |
1924 | * was the last reference to this request. | |
1925 | */ | |
9b5f7bd9 | 1926 | static struct io_kiocb *io_put_req_find_next(struct io_kiocb *req) |
e65ef56d | 1927 | { |
9b5f7bd9 PB |
1928 | struct io_kiocb *nxt = NULL; |
1929 | ||
2a44f467 | 1930 | if (refcount_dec_and_test(&req->refs)) { |
9b5f7bd9 | 1931 | nxt = io_req_find_next(req); |
4d7dd462 | 1932 | __io_free_req(req); |
2a44f467 | 1933 | } |
9b5f7bd9 | 1934 | return nxt; |
2b188cc1 JA |
1935 | } |
1936 | ||
e65ef56d JA |
1937 | static void io_put_req(struct io_kiocb *req) |
1938 | { | |
1939 | if (refcount_dec_and_test(&req->refs)) | |
1940 | io_free_req(req); | |
2b188cc1 JA |
1941 | } |
1942 | ||
f4db7182 | 1943 | static struct io_wq_work *io_steal_work(struct io_kiocb *req) |
7a743e22 | 1944 | { |
6df1db6b | 1945 | struct io_kiocb *nxt; |
f4db7182 | 1946 | |
7a743e22 | 1947 | /* |
f4db7182 PB |
1948 | * A ref is owned by io-wq in which context we're. So, if that's the |
1949 | * last one, it's safe to steal next work. False negatives are Ok, | |
1950 | * it just will be re-punted async in io_put_work() | |
7a743e22 | 1951 | */ |
f4db7182 PB |
1952 | if (refcount_read(&req->refs) != 1) |
1953 | return NULL; | |
7a743e22 | 1954 | |
9b5f7bd9 | 1955 | nxt = io_req_find_next(req); |
6df1db6b | 1956 | return nxt ? &nxt->work : NULL; |
7a743e22 PB |
1957 | } |
1958 | ||
978db57e JA |
1959 | /* |
1960 | * Must only be used if we don't need to care about links, usually from | |
1961 | * within the completion handling itself. | |
1962 | */ | |
1963 | static void __io_double_put_req(struct io_kiocb *req) | |
78e19bbe JA |
1964 | { |
1965 | /* drop both submit and complete references */ | |
1966 | if (refcount_sub_and_test(2, &req->refs)) | |
1967 | __io_free_req(req); | |
1968 | } | |
1969 | ||
978db57e JA |
1970 | static void io_double_put_req(struct io_kiocb *req) |
1971 | { | |
1972 | /* drop both submit and complete references */ | |
1973 | if (refcount_sub_and_test(2, &req->refs)) | |
1974 | io_free_req(req); | |
1975 | } | |
1976 | ||
1d7bb1d5 | 1977 | static unsigned io_cqring_events(struct io_ring_ctx *ctx, bool noflush) |
a3a0e43f | 1978 | { |
84f97dc2 JA |
1979 | struct io_rings *rings = ctx->rings; |
1980 | ||
ad3eb2c8 JA |
1981 | if (test_bit(0, &ctx->cq_check_overflow)) { |
1982 | /* | |
1983 | * noflush == true is from the waitqueue handler, just ensure | |
1984 | * we wake up the task, and the next invocation will flush the | |
1985 | * entries. We cannot safely to it from here. | |
1986 | */ | |
1987 | if (noflush && !list_empty(&ctx->cq_overflow_list)) | |
1988 | return -1U; | |
1d7bb1d5 | 1989 | |
ad3eb2c8 JA |
1990 | io_cqring_overflow_flush(ctx, false); |
1991 | } | |
1d7bb1d5 | 1992 | |
a3a0e43f JA |
1993 | /* See comment at the top of this file */ |
1994 | smp_rmb(); | |
ad3eb2c8 | 1995 | return ctx->cached_cq_tail - READ_ONCE(rings->cq.head); |
a3a0e43f JA |
1996 | } |
1997 | ||
fb5ccc98 PB |
1998 | static inline unsigned int io_sqring_entries(struct io_ring_ctx *ctx) |
1999 | { | |
2000 | struct io_rings *rings = ctx->rings; | |
2001 | ||
2002 | /* make sure SQ entry isn't read before tail */ | |
2003 | return smp_load_acquire(&rings->sq.tail) - ctx->cached_sq_head; | |
2004 | } | |
2005 | ||
8ff069bf | 2006 | static unsigned int io_put_kbuf(struct io_kiocb *req, struct io_buffer *kbuf) |
e94f141b | 2007 | { |
8ff069bf | 2008 | unsigned int cflags; |
e94f141b | 2009 | |
bcda7baa JA |
2010 | cflags = kbuf->bid << IORING_CQE_BUFFER_SHIFT; |
2011 | cflags |= IORING_CQE_F_BUFFER; | |
0e1b6fe3 | 2012 | req->flags &= ~REQ_F_BUFFER_SELECTED; |
bcda7baa JA |
2013 | kfree(kbuf); |
2014 | return cflags; | |
e94f141b JA |
2015 | } |
2016 | ||
8ff069bf | 2017 | static inline unsigned int io_put_rw_kbuf(struct io_kiocb *req) |
bcda7baa | 2018 | { |
4d954c25 | 2019 | struct io_buffer *kbuf; |
bcda7baa | 2020 | |
4d954c25 | 2021 | kbuf = (struct io_buffer *) (unsigned long) req->rw.addr; |
8ff069bf PB |
2022 | return io_put_kbuf(req, kbuf); |
2023 | } | |
2024 | ||
4c6e277c JA |
2025 | static inline bool io_run_task_work(void) |
2026 | { | |
2027 | if (current->task_works) { | |
2028 | __set_current_state(TASK_RUNNING); | |
2029 | task_work_run(); | |
2030 | return true; | |
2031 | } | |
2032 | ||
2033 | return false; | |
bcda7baa JA |
2034 | } |
2035 | ||
bbde017a XW |
2036 | static void io_iopoll_queue(struct list_head *again) |
2037 | { | |
2038 | struct io_kiocb *req; | |
2039 | ||
2040 | do { | |
d21ffe7e PB |
2041 | req = list_first_entry(again, struct io_kiocb, inflight_entry); |
2042 | list_del(&req->inflight_entry); | |
81b68a5c | 2043 | __io_complete_rw(req, -EAGAIN, 0, NULL); |
bbde017a XW |
2044 | } while (!list_empty(again)); |
2045 | } | |
2046 | ||
def596e9 JA |
2047 | /* |
2048 | * Find and free completed poll iocbs | |
2049 | */ | |
2050 | static void io_iopoll_complete(struct io_ring_ctx *ctx, unsigned int *nr_events, | |
2051 | struct list_head *done) | |
2052 | { | |
8237e045 | 2053 | struct req_batch rb; |
def596e9 | 2054 | struct io_kiocb *req; |
bbde017a XW |
2055 | LIST_HEAD(again); |
2056 | ||
2057 | /* order with ->result store in io_complete_rw_iopoll() */ | |
2058 | smp_rmb(); | |
def596e9 | 2059 | |
5af1d13e | 2060 | io_init_req_batch(&rb); |
def596e9 | 2061 | while (!list_empty(done)) { |
bcda7baa JA |
2062 | int cflags = 0; |
2063 | ||
d21ffe7e | 2064 | req = list_first_entry(done, struct io_kiocb, inflight_entry); |
bbde017a XW |
2065 | if (READ_ONCE(req->result) == -EAGAIN) { |
2066 | req->iopoll_completed = 0; | |
d21ffe7e | 2067 | list_move_tail(&req->inflight_entry, &again); |
bbde017a XW |
2068 | continue; |
2069 | } | |
d21ffe7e | 2070 | list_del(&req->inflight_entry); |
def596e9 | 2071 | |
bcda7baa | 2072 | if (req->flags & REQ_F_BUFFER_SELECTED) |
8ff069bf | 2073 | cflags = io_put_rw_kbuf(req); |
bcda7baa JA |
2074 | |
2075 | __io_cqring_fill_event(req, req->result, cflags); | |
def596e9 JA |
2076 | (*nr_events)++; |
2077 | ||
c3524383 | 2078 | if (refcount_dec_and_test(&req->refs)) |
2d6500d4 | 2079 | io_req_free_batch(&rb, req); |
def596e9 | 2080 | } |
def596e9 | 2081 | |
09bb8394 | 2082 | io_commit_cqring(ctx); |
32b2244a XW |
2083 | if (ctx->flags & IORING_SETUP_SQPOLL) |
2084 | io_cqring_ev_posted(ctx); | |
2d6500d4 | 2085 | io_req_free_batch_finish(ctx, &rb); |
581f9810 | 2086 | |
bbde017a XW |
2087 | if (!list_empty(&again)) |
2088 | io_iopoll_queue(&again); | |
581f9810 BM |
2089 | } |
2090 | ||
def596e9 JA |
2091 | static int io_do_iopoll(struct io_ring_ctx *ctx, unsigned int *nr_events, |
2092 | long min) | |
2093 | { | |
2094 | struct io_kiocb *req, *tmp; | |
2095 | LIST_HEAD(done); | |
2096 | bool spin; | |
2097 | int ret; | |
2098 | ||
2099 | /* | |
2100 | * Only spin for completions if we don't have multiple devices hanging | |
2101 | * off our complete list, and we're under the requested amount. | |
2102 | */ | |
2103 | spin = !ctx->poll_multi_file && *nr_events < min; | |
2104 | ||
2105 | ret = 0; | |
d21ffe7e | 2106 | list_for_each_entry_safe(req, tmp, &ctx->iopoll_list, inflight_entry) { |
9adbd45d | 2107 | struct kiocb *kiocb = &req->rw.kiocb; |
def596e9 JA |
2108 | |
2109 | /* | |
581f9810 BM |
2110 | * Move completed and retryable entries to our local lists. |
2111 | * If we find a request that requires polling, break out | |
2112 | * and complete those lists first, if we have entries there. | |
def596e9 | 2113 | */ |
65a6543d | 2114 | if (READ_ONCE(req->iopoll_completed)) { |
d21ffe7e | 2115 | list_move_tail(&req->inflight_entry, &done); |
def596e9 JA |
2116 | continue; |
2117 | } | |
2118 | if (!list_empty(&done)) | |
2119 | break; | |
2120 | ||
2121 | ret = kiocb->ki_filp->f_op->iopoll(kiocb, spin); | |
2122 | if (ret < 0) | |
2123 | break; | |
2124 | ||
3aadc23e PB |
2125 | /* iopoll may have completed current req */ |
2126 | if (READ_ONCE(req->iopoll_completed)) | |
d21ffe7e | 2127 | list_move_tail(&req->inflight_entry, &done); |
3aadc23e | 2128 | |
def596e9 JA |
2129 | if (ret && spin) |
2130 | spin = false; | |
2131 | ret = 0; | |
2132 | } | |
2133 | ||
2134 | if (!list_empty(&done)) | |
2135 | io_iopoll_complete(ctx, nr_events, &done); | |
2136 | ||
2137 | return ret; | |
2138 | } | |
2139 | ||
2140 | /* | |
d195a66e | 2141 | * Poll for a minimum of 'min' events. Note that if min == 0 we consider that a |
def596e9 JA |
2142 | * non-spinning poll check - we'll still enter the driver poll loop, but only |
2143 | * as a non-spinning completion check. | |
2144 | */ | |
2145 | static int io_iopoll_getevents(struct io_ring_ctx *ctx, unsigned int *nr_events, | |
2146 | long min) | |
2147 | { | |
540e32a0 | 2148 | while (!list_empty(&ctx->iopoll_list) && !need_resched()) { |
def596e9 JA |
2149 | int ret; |
2150 | ||
2151 | ret = io_do_iopoll(ctx, nr_events, min); | |
2152 | if (ret < 0) | |
2153 | return ret; | |
eba0a4dd | 2154 | if (*nr_events >= min) |
def596e9 JA |
2155 | return 0; |
2156 | } | |
2157 | ||
2158 | return 1; | |
2159 | } | |
2160 | ||
2161 | /* | |
2162 | * We can't just wait for polled events to come to us, we have to actively | |
2163 | * find and complete them. | |
2164 | */ | |
b2edc0a7 | 2165 | static void io_iopoll_try_reap_events(struct io_ring_ctx *ctx) |
def596e9 JA |
2166 | { |
2167 | if (!(ctx->flags & IORING_SETUP_IOPOLL)) | |
2168 | return; | |
2169 | ||
2170 | mutex_lock(&ctx->uring_lock); | |
540e32a0 | 2171 | while (!list_empty(&ctx->iopoll_list)) { |
def596e9 JA |
2172 | unsigned int nr_events = 0; |
2173 | ||
b2edc0a7 | 2174 | io_do_iopoll(ctx, &nr_events, 0); |
08f5439f | 2175 | |
b2edc0a7 PB |
2176 | /* let it sleep and repeat later if can't complete a request */ |
2177 | if (nr_events == 0) | |
2178 | break; | |
08f5439f JA |
2179 | /* |
2180 | * Ensure we allow local-to-the-cpu processing to take place, | |
2181 | * in this case we need to ensure that we reap all events. | |
3fcee5a6 | 2182 | * Also let task_work, etc. to progress by releasing the mutex |
08f5439f | 2183 | */ |
3fcee5a6 PB |
2184 | if (need_resched()) { |
2185 | mutex_unlock(&ctx->uring_lock); | |
2186 | cond_resched(); | |
2187 | mutex_lock(&ctx->uring_lock); | |
2188 | } | |
def596e9 JA |
2189 | } |
2190 | mutex_unlock(&ctx->uring_lock); | |
2191 | } | |
2192 | ||
7668b92a | 2193 | static int io_iopoll_check(struct io_ring_ctx *ctx, long min) |
def596e9 | 2194 | { |
7668b92a | 2195 | unsigned int nr_events = 0; |
2b2ed975 | 2196 | int iters = 0, ret = 0; |
500f9fba | 2197 | |
c7849be9 XW |
2198 | /* |
2199 | * We disallow the app entering submit/complete with polling, but we | |
2200 | * still need to lock the ring to prevent racing with polled issue | |
2201 | * that got punted to a workqueue. | |
2202 | */ | |
2203 | mutex_lock(&ctx->uring_lock); | |
def596e9 | 2204 | do { |
a3a0e43f JA |
2205 | /* |
2206 | * Don't enter poll loop if we already have events pending. | |
2207 | * If we do, we can potentially be spinning for commands that | |
2208 | * already triggered a CQE (eg in error). | |
2209 | */ | |
1d7bb1d5 | 2210 | if (io_cqring_events(ctx, false)) |
a3a0e43f JA |
2211 | break; |
2212 | ||
500f9fba JA |
2213 | /* |
2214 | * If a submit got punted to a workqueue, we can have the | |
2215 | * application entering polling for a command before it gets | |
2216 | * issued. That app will hold the uring_lock for the duration | |
2217 | * of the poll right here, so we need to take a breather every | |
2218 | * now and then to ensure that the issue has a chance to add | |
2219 | * the poll to the issued list. Otherwise we can spin here | |
2220 | * forever, while the workqueue is stuck trying to acquire the | |
2221 | * very same mutex. | |
2222 | */ | |
2223 | if (!(++iters & 7)) { | |
2224 | mutex_unlock(&ctx->uring_lock); | |
4c6e277c | 2225 | io_run_task_work(); |
500f9fba JA |
2226 | mutex_lock(&ctx->uring_lock); |
2227 | } | |
2228 | ||
7668b92a | 2229 | ret = io_iopoll_getevents(ctx, &nr_events, min); |
def596e9 JA |
2230 | if (ret <= 0) |
2231 | break; | |
2232 | ret = 0; | |
7668b92a | 2233 | } while (min && !nr_events && !need_resched()); |
def596e9 | 2234 | |
500f9fba | 2235 | mutex_unlock(&ctx->uring_lock); |
def596e9 JA |
2236 | return ret; |
2237 | } | |
2238 | ||
491381ce | 2239 | static void kiocb_end_write(struct io_kiocb *req) |
2b188cc1 | 2240 | { |
491381ce JA |
2241 | /* |
2242 | * Tell lockdep we inherited freeze protection from submission | |
2243 | * thread. | |
2244 | */ | |
2245 | if (req->flags & REQ_F_ISREG) { | |
2246 | struct inode *inode = file_inode(req->file); | |
2b188cc1 | 2247 | |
491381ce | 2248 | __sb_writers_acquired(inode->i_sb, SB_FREEZE_WRITE); |
2b188cc1 | 2249 | } |
491381ce | 2250 | file_end_write(req->file); |
2b188cc1 JA |
2251 | } |
2252 | ||
a1d7c393 JA |
2253 | static void io_complete_rw_common(struct kiocb *kiocb, long res, |
2254 | struct io_comp_state *cs) | |
2b188cc1 | 2255 | { |
9adbd45d | 2256 | struct io_kiocb *req = container_of(kiocb, struct io_kiocb, rw.kiocb); |
bcda7baa | 2257 | int cflags = 0; |
2b188cc1 | 2258 | |
491381ce JA |
2259 | if (kiocb->ki_flags & IOCB_WRITE) |
2260 | kiocb_end_write(req); | |
2b188cc1 | 2261 | |
4e88d6e7 JA |
2262 | if (res != req->result) |
2263 | req_set_fail_links(req); | |
bcda7baa | 2264 | if (req->flags & REQ_F_BUFFER_SELECTED) |
8ff069bf | 2265 | cflags = io_put_rw_kbuf(req); |
a1d7c393 | 2266 | __io_req_complete(req, res, cflags, cs); |
ba816ad6 JA |
2267 | } |
2268 | ||
b63534c4 JA |
2269 | #ifdef CONFIG_BLOCK |
2270 | static bool io_resubmit_prep(struct io_kiocb *req, int error) | |
2271 | { | |
2272 | struct iovec inline_vecs[UIO_FASTIOV], *iovec = inline_vecs; | |
2273 | ssize_t ret = -ECANCELED; | |
2274 | struct iov_iter iter; | |
2275 | int rw; | |
2276 | ||
2277 | if (error) { | |
2278 | ret = error; | |
2279 | goto end_req; | |
2280 | } | |
2281 | ||
2282 | switch (req->opcode) { | |
2283 | case IORING_OP_READV: | |
2284 | case IORING_OP_READ_FIXED: | |
2285 | case IORING_OP_READ: | |
2286 | rw = READ; | |
2287 | break; | |
2288 | case IORING_OP_WRITEV: | |
2289 | case IORING_OP_WRITE_FIXED: | |
2290 | case IORING_OP_WRITE: | |
2291 | rw = WRITE; | |
2292 | break; | |
2293 | default: | |
2294 | printk_once(KERN_WARNING "io_uring: bad opcode in resubmit %d\n", | |
2295 | req->opcode); | |
2296 | goto end_req; | |
2297 | } | |
2298 | ||
2299 | ret = io_import_iovec(rw, req, &iovec, &iter, false); | |
2300 | if (ret < 0) | |
2301 | goto end_req; | |
2302 | ret = io_setup_async_rw(req, ret, iovec, inline_vecs, &iter); | |
2303 | if (!ret) | |
2304 | return true; | |
2305 | kfree(iovec); | |
2306 | end_req: | |
b63534c4 | 2307 | req_set_fail_links(req); |
e1e16097 | 2308 | io_req_complete(req, ret); |
b63534c4 JA |
2309 | return false; |
2310 | } | |
2311 | ||
2312 | static void io_rw_resubmit(struct callback_head *cb) | |
2313 | { | |
2314 | struct io_kiocb *req = container_of(cb, struct io_kiocb, task_work); | |
2315 | struct io_ring_ctx *ctx = req->ctx; | |
2316 | int err; | |
2317 | ||
b63534c4 JA |
2318 | err = io_sq_thread_acquire_mm(ctx, req); |
2319 | ||
2320 | if (io_resubmit_prep(req, err)) { | |
2321 | refcount_inc(&req->refs); | |
2322 | io_queue_async_work(req); | |
2323 | } | |
6d816e08 JA |
2324 | |
2325 | percpu_ref_put(&ctx->refs); | |
b63534c4 JA |
2326 | } |
2327 | #endif | |
2328 | ||
2329 | static bool io_rw_reissue(struct io_kiocb *req, long res) | |
2330 | { | |
2331 | #ifdef CONFIG_BLOCK | |
b63534c4 JA |
2332 | int ret; |
2333 | ||
2334 | if ((res != -EAGAIN && res != -EOPNOTSUPP) || io_wq_current_is_worker()) | |
2335 | return false; | |
2336 | ||
b63534c4 | 2337 | init_task_work(&req->task_work, io_rw_resubmit); |
6d816e08 JA |
2338 | percpu_ref_get(&req->ctx->refs); |
2339 | ||
c2c4c83c JA |
2340 | ret = io_req_task_work_add(req, &req->task_work); |
2341 | if (!ret) | |
b63534c4 JA |
2342 | return true; |
2343 | #endif | |
2344 | return false; | |
2345 | } | |
2346 | ||
a1d7c393 JA |
2347 | static void __io_complete_rw(struct io_kiocb *req, long res, long res2, |
2348 | struct io_comp_state *cs) | |
2349 | { | |
2350 | if (!io_rw_reissue(req, res)) | |
2351 | io_complete_rw_common(&req->rw.kiocb, res, cs); | |
ba816ad6 JA |
2352 | } |
2353 | ||
2354 | static void io_complete_rw(struct kiocb *kiocb, long res, long res2) | |
2355 | { | |
9adbd45d | 2356 | struct io_kiocb *req = container_of(kiocb, struct io_kiocb, rw.kiocb); |
ba816ad6 | 2357 | |
a1d7c393 | 2358 | __io_complete_rw(req, res, res2, NULL); |
2b188cc1 JA |
2359 | } |
2360 | ||
def596e9 JA |
2361 | static void io_complete_rw_iopoll(struct kiocb *kiocb, long res, long res2) |
2362 | { | |
9adbd45d | 2363 | struct io_kiocb *req = container_of(kiocb, struct io_kiocb, rw.kiocb); |
def596e9 | 2364 | |
491381ce JA |
2365 | if (kiocb->ki_flags & IOCB_WRITE) |
2366 | kiocb_end_write(req); | |
def596e9 | 2367 | |
2d7d6792 | 2368 | if (res != -EAGAIN && res != req->result) |
4e88d6e7 | 2369 | req_set_fail_links(req); |
bbde017a XW |
2370 | |
2371 | WRITE_ONCE(req->result, res); | |
2372 | /* order with io_poll_complete() checking ->result */ | |
cd664b0e PB |
2373 | smp_wmb(); |
2374 | WRITE_ONCE(req->iopoll_completed, 1); | |
def596e9 JA |
2375 | } |
2376 | ||
2377 | /* | |
2378 | * After the iocb has been issued, it's safe to be found on the poll list. | |
2379 | * Adding the kiocb to the list AFTER submission ensures that we don't | |
2380 | * find it from a io_iopoll_getevents() thread before the issuer is done | |
2381 | * accessing the kiocb cookie. | |
2382 | */ | |
2383 | static void io_iopoll_req_issued(struct io_kiocb *req) | |
2384 | { | |
2385 | struct io_ring_ctx *ctx = req->ctx; | |
2386 | ||
2387 | /* | |
2388 | * Track whether we have multiple files in our lists. This will impact | |
2389 | * how we do polling eventually, not spinning if we're on potentially | |
2390 | * different devices. | |
2391 | */ | |
540e32a0 | 2392 | if (list_empty(&ctx->iopoll_list)) { |
def596e9 JA |
2393 | ctx->poll_multi_file = false; |
2394 | } else if (!ctx->poll_multi_file) { | |
2395 | struct io_kiocb *list_req; | |
2396 | ||
540e32a0 | 2397 | list_req = list_first_entry(&ctx->iopoll_list, struct io_kiocb, |
d21ffe7e | 2398 | inflight_entry); |
9adbd45d | 2399 | if (list_req->file != req->file) |
def596e9 JA |
2400 | ctx->poll_multi_file = true; |
2401 | } | |
2402 | ||
2403 | /* | |
2404 | * For fast devices, IO may have already completed. If it has, add | |
2405 | * it to the front so we find it first. | |
2406 | */ | |
65a6543d | 2407 | if (READ_ONCE(req->iopoll_completed)) |
d21ffe7e | 2408 | list_add(&req->inflight_entry, &ctx->iopoll_list); |
def596e9 | 2409 | else |
d21ffe7e | 2410 | list_add_tail(&req->inflight_entry, &ctx->iopoll_list); |
bdcd3eab XW |
2411 | |
2412 | if ((ctx->flags & IORING_SETUP_SQPOLL) && | |
2413 | wq_has_sleeper(&ctx->sqo_wait)) | |
2414 | wake_up(&ctx->sqo_wait); | |
def596e9 JA |
2415 | } |
2416 | ||
9f13c35b | 2417 | static void __io_state_file_put(struct io_submit_state *state) |
9a56a232 | 2418 | { |
06ef3608 PB |
2419 | if (state->has_refs) |
2420 | fput_many(state->file, state->has_refs); | |
9f13c35b PB |
2421 | state->file = NULL; |
2422 | } | |
2423 | ||
2424 | static inline void io_state_file_put(struct io_submit_state *state) | |
2425 | { | |
2426 | if (state->file) | |
2427 | __io_state_file_put(state); | |
9a56a232 JA |
2428 | } |
2429 | ||
2430 | /* | |
2431 | * Get as many references to a file as we have IOs left in this submission, | |
2432 | * assuming most submissions are for one file, or at least that each file | |
2433 | * has more than one submission. | |
2434 | */ | |
8da11c19 | 2435 | static struct file *__io_file_get(struct io_submit_state *state, int fd) |
9a56a232 JA |
2436 | { |
2437 | if (!state) | |
2438 | return fget(fd); | |
2439 | ||
2440 | if (state->file) { | |
2441 | if (state->fd == fd) { | |
06ef3608 | 2442 | state->has_refs--; |
9a56a232 JA |
2443 | state->ios_left--; |
2444 | return state->file; | |
2445 | } | |
9f13c35b | 2446 | __io_state_file_put(state); |
9a56a232 JA |
2447 | } |
2448 | state->file = fget_many(fd, state->ios_left); | |
2449 | if (!state->file) | |
2450 | return NULL; | |
2451 | ||
2452 | state->fd = fd; | |
9a56a232 | 2453 | state->ios_left--; |
06ef3608 | 2454 | state->has_refs = state->ios_left; |
9a56a232 JA |
2455 | return state->file; |
2456 | } | |
2457 | ||
4503b767 JA |
2458 | static bool io_bdev_nowait(struct block_device *bdev) |
2459 | { | |
2460 | #ifdef CONFIG_BLOCK | |
2461 | return !bdev || queue_is_mq(bdev_get_queue(bdev)); | |
2462 | #else | |
2463 | return true; | |
2464 | #endif | |
2465 | } | |
2466 | ||
2b188cc1 JA |
2467 | /* |
2468 | * If we tracked the file through the SCM inflight mechanism, we could support | |
2469 | * any file. For now, just ensure that anything potentially problematic is done | |
2470 | * inline. | |
2471 | */ | |
af197f50 | 2472 | static bool io_file_supports_async(struct file *file, int rw) |
2b188cc1 JA |
2473 | { |
2474 | umode_t mode = file_inode(file)->i_mode; | |
2475 | ||
4503b767 JA |
2476 | if (S_ISBLK(mode)) { |
2477 | if (io_bdev_nowait(file->f_inode->i_bdev)) | |
2478 | return true; | |
2479 | return false; | |
2480 | } | |
2481 | if (S_ISCHR(mode) || S_ISSOCK(mode)) | |
2b188cc1 | 2482 | return true; |
4503b767 JA |
2483 | if (S_ISREG(mode)) { |
2484 | if (io_bdev_nowait(file->f_inode->i_sb->s_bdev) && | |
2485 | file->f_op != &io_uring_fops) | |
2486 | return true; | |
2487 | return false; | |
2488 | } | |
2b188cc1 | 2489 | |
c5b85625 JA |
2490 | /* any ->read/write should understand O_NONBLOCK */ |
2491 | if (file->f_flags & O_NONBLOCK) | |
2492 | return true; | |
2493 | ||
af197f50 JA |
2494 | if (!(file->f_mode & FMODE_NOWAIT)) |
2495 | return false; | |
2496 | ||
2497 | if (rw == READ) | |
2498 | return file->f_op->read_iter != NULL; | |
2499 | ||
2500 | return file->f_op->write_iter != NULL; | |
2b188cc1 JA |
2501 | } |
2502 | ||
3529d8c2 JA |
2503 | static int io_prep_rw(struct io_kiocb *req, const struct io_uring_sqe *sqe, |
2504 | bool force_nonblock) | |
2b188cc1 | 2505 | { |
def596e9 | 2506 | struct io_ring_ctx *ctx = req->ctx; |
9adbd45d | 2507 | struct kiocb *kiocb = &req->rw.kiocb; |
09bb8394 JA |
2508 | unsigned ioprio; |
2509 | int ret; | |
2b188cc1 | 2510 | |
491381ce JA |
2511 | if (S_ISREG(file_inode(req->file)->i_mode)) |
2512 | req->flags |= REQ_F_ISREG; | |
2513 | ||
2b188cc1 | 2514 | kiocb->ki_pos = READ_ONCE(sqe->off); |
ba04291e JA |
2515 | if (kiocb->ki_pos == -1 && !(req->file->f_mode & FMODE_STREAM)) { |
2516 | req->flags |= REQ_F_CUR_POS; | |
2517 | kiocb->ki_pos = req->file->f_pos; | |
2518 | } | |
2b188cc1 | 2519 | kiocb->ki_hint = ki_hint_validate(file_write_hint(kiocb->ki_filp)); |
3e577dcd PB |
2520 | kiocb->ki_flags = iocb_flags(kiocb->ki_filp); |
2521 | ret = kiocb_set_rw_flags(kiocb, READ_ONCE(sqe->rw_flags)); | |
2522 | if (unlikely(ret)) | |
2523 | return ret; | |
2b188cc1 JA |
2524 | |
2525 | ioprio = READ_ONCE(sqe->ioprio); | |
2526 | if (ioprio) { | |
2527 | ret = ioprio_check_cap(ioprio); | |
2528 | if (ret) | |
09bb8394 | 2529 | return ret; |
2b188cc1 JA |
2530 | |
2531 | kiocb->ki_ioprio = ioprio; | |
2532 | } else | |
2533 | kiocb->ki_ioprio = get_current_ioprio(); | |
2534 | ||
8449eeda | 2535 | /* don't allow async punt if RWF_NOWAIT was requested */ |
c5b85625 | 2536 | if (kiocb->ki_flags & IOCB_NOWAIT) |
8449eeda SB |
2537 | req->flags |= REQ_F_NOWAIT; |
2538 | ||
b63534c4 JA |
2539 | if (kiocb->ki_flags & IOCB_DIRECT) |
2540 | io_get_req_task(req); | |
2541 | ||
8449eeda | 2542 | if (force_nonblock) |
2b188cc1 | 2543 | kiocb->ki_flags |= IOCB_NOWAIT; |
8449eeda | 2544 | |
def596e9 | 2545 | if (ctx->flags & IORING_SETUP_IOPOLL) { |
def596e9 JA |
2546 | if (!(kiocb->ki_flags & IOCB_DIRECT) || |
2547 | !kiocb->ki_filp->f_op->iopoll) | |
09bb8394 | 2548 | return -EOPNOTSUPP; |
2b188cc1 | 2549 | |
def596e9 JA |
2550 | kiocb->ki_flags |= IOCB_HIPRI; |
2551 | kiocb->ki_complete = io_complete_rw_iopoll; | |
65a6543d | 2552 | req->iopoll_completed = 0; |
f3a6fa22 | 2553 | io_get_req_task(req); |
def596e9 | 2554 | } else { |
09bb8394 JA |
2555 | if (kiocb->ki_flags & IOCB_HIPRI) |
2556 | return -EINVAL; | |
def596e9 JA |
2557 | kiocb->ki_complete = io_complete_rw; |
2558 | } | |
9adbd45d | 2559 | |
3529d8c2 JA |
2560 | req->rw.addr = READ_ONCE(sqe->addr); |
2561 | req->rw.len = READ_ONCE(sqe->len); | |
4f4eeba8 | 2562 | req->buf_index = READ_ONCE(sqe->buf_index); |
2b188cc1 | 2563 | return 0; |
2b188cc1 JA |
2564 | } |
2565 | ||
2566 | static inline void io_rw_done(struct kiocb *kiocb, ssize_t ret) | |
2567 | { | |
2568 | switch (ret) { | |
2569 | case -EIOCBQUEUED: | |
2570 | break; | |
2571 | case -ERESTARTSYS: | |
2572 | case -ERESTARTNOINTR: | |
2573 | case -ERESTARTNOHAND: | |
2574 | case -ERESTART_RESTARTBLOCK: | |
2575 | /* | |
2576 | * We can't just restart the syscall, since previously | |
2577 | * submitted sqes may already be in progress. Just fail this | |
2578 | * IO with EINTR. | |
2579 | */ | |
2580 | ret = -EINTR; | |
2581 | /* fall through */ | |
2582 | default: | |
2583 | kiocb->ki_complete(kiocb, ret, 0); | |
2584 | } | |
2585 | } | |
2586 | ||
a1d7c393 JA |
2587 | static void kiocb_done(struct kiocb *kiocb, ssize_t ret, |
2588 | struct io_comp_state *cs) | |
ba816ad6 | 2589 | { |
ba04291e JA |
2590 | struct io_kiocb *req = container_of(kiocb, struct io_kiocb, rw.kiocb); |
2591 | ||
2592 | if (req->flags & REQ_F_CUR_POS) | |
2593 | req->file->f_pos = kiocb->ki_pos; | |
bcaec089 | 2594 | if (ret >= 0 && kiocb->ki_complete == io_complete_rw) |
a1d7c393 | 2595 | __io_complete_rw(req, ret, 0, cs); |
ba816ad6 JA |
2596 | else |
2597 | io_rw_done(kiocb, ret); | |
2598 | } | |
2599 | ||
9adbd45d | 2600 | static ssize_t io_import_fixed(struct io_kiocb *req, int rw, |
7d009165 | 2601 | struct iov_iter *iter) |
edafccee | 2602 | { |
9adbd45d JA |
2603 | struct io_ring_ctx *ctx = req->ctx; |
2604 | size_t len = req->rw.len; | |
edafccee | 2605 | struct io_mapped_ubuf *imu; |
4f4eeba8 | 2606 | u16 index, buf_index; |
edafccee JA |
2607 | size_t offset; |
2608 | u64 buf_addr; | |
2609 | ||
2610 | /* attempt to use fixed buffers without having provided iovecs */ | |
2611 | if (unlikely(!ctx->user_bufs)) | |
2612 | return -EFAULT; | |
2613 | ||
4f4eeba8 | 2614 | buf_index = req->buf_index; |
edafccee JA |
2615 | if (unlikely(buf_index >= ctx->nr_user_bufs)) |
2616 | return -EFAULT; | |
2617 | ||
2618 | index = array_index_nospec(buf_index, ctx->nr_user_bufs); | |
2619 | imu = &ctx->user_bufs[index]; | |
9adbd45d | 2620 | buf_addr = req->rw.addr; |
edafccee JA |
2621 | |
2622 | /* overflow */ | |
2623 | if (buf_addr + len < buf_addr) | |
2624 | return -EFAULT; | |
2625 | /* not inside the mapped region */ | |
2626 | if (buf_addr < imu->ubuf || buf_addr + len > imu->ubuf + imu->len) | |
2627 | return -EFAULT; | |
2628 | ||
2629 | /* | |
2630 | * May not be a start of buffer, set size appropriately | |
2631 | * and advance us to the beginning. | |
2632 | */ | |
2633 | offset = buf_addr - imu->ubuf; | |
2634 | iov_iter_bvec(iter, rw, imu->bvec, imu->nr_bvecs, offset + len); | |
bd11b3a3 JA |
2635 | |
2636 | if (offset) { | |
2637 | /* | |
2638 | * Don't use iov_iter_advance() here, as it's really slow for | |
2639 | * using the latter parts of a big fixed buffer - it iterates | |
2640 | * over each segment manually. We can cheat a bit here, because | |
2641 | * we know that: | |
2642 | * | |
2643 | * 1) it's a BVEC iter, we set it up | |
2644 | * 2) all bvecs are PAGE_SIZE in size, except potentially the | |
2645 | * first and last bvec | |
2646 | * | |
2647 | * So just find our index, and adjust the iterator afterwards. | |
2648 | * If the offset is within the first bvec (or the whole first | |
2649 | * bvec, just use iov_iter_advance(). This makes it easier | |
2650 | * since we can just skip the first segment, which may not | |
2651 | * be PAGE_SIZE aligned. | |
2652 | */ | |
2653 | const struct bio_vec *bvec = imu->bvec; | |
2654 | ||
2655 | if (offset <= bvec->bv_len) { | |
2656 | iov_iter_advance(iter, offset); | |
2657 | } else { | |
2658 | unsigned long seg_skip; | |
2659 | ||
2660 | /* skip first vec */ | |
2661 | offset -= bvec->bv_len; | |
2662 | seg_skip = 1 + (offset >> PAGE_SHIFT); | |
2663 | ||
2664 | iter->bvec = bvec + seg_skip; | |
2665 | iter->nr_segs -= seg_skip; | |
99c79f66 | 2666 | iter->count -= bvec->bv_len + offset; |
bd11b3a3 | 2667 | iter->iov_offset = offset & ~PAGE_MASK; |
bd11b3a3 JA |
2668 | } |
2669 | } | |
2670 | ||
5e559561 | 2671 | return len; |
edafccee JA |
2672 | } |
2673 | ||
bcda7baa JA |
2674 | static void io_ring_submit_unlock(struct io_ring_ctx *ctx, bool needs_lock) |
2675 | { | |
2676 | if (needs_lock) | |
2677 | mutex_unlock(&ctx->uring_lock); | |
2678 | } | |
2679 | ||
2680 | static void io_ring_submit_lock(struct io_ring_ctx *ctx, bool needs_lock) | |
2681 | { | |
2682 | /* | |
2683 | * "Normal" inline submissions always hold the uring_lock, since we | |
2684 | * grab it from the system call. Same is true for the SQPOLL offload. | |
2685 | * The only exception is when we've detached the request and issue it | |
2686 | * from an async worker thread, grab the lock for that case. | |
2687 | */ | |
2688 | if (needs_lock) | |
2689 | mutex_lock(&ctx->uring_lock); | |
2690 | } | |
2691 | ||
2692 | static struct io_buffer *io_buffer_select(struct io_kiocb *req, size_t *len, | |
2693 | int bgid, struct io_buffer *kbuf, | |
2694 | bool needs_lock) | |
2695 | { | |
2696 | struct io_buffer *head; | |
2697 | ||
2698 | if (req->flags & REQ_F_BUFFER_SELECTED) | |
2699 | return kbuf; | |
2700 | ||
2701 | io_ring_submit_lock(req->ctx, needs_lock); | |
2702 | ||
2703 | lockdep_assert_held(&req->ctx->uring_lock); | |
2704 | ||
2705 | head = idr_find(&req->ctx->io_buffer_idr, bgid); | |
2706 | if (head) { | |
2707 | if (!list_empty(&head->list)) { | |
2708 | kbuf = list_last_entry(&head->list, struct io_buffer, | |
2709 | list); | |
2710 | list_del(&kbuf->list); | |
2711 | } else { | |
2712 | kbuf = head; | |
2713 | idr_remove(&req->ctx->io_buffer_idr, bgid); | |
2714 | } | |
2715 | if (*len > kbuf->len) | |
2716 | *len = kbuf->len; | |
2717 | } else { | |
2718 | kbuf = ERR_PTR(-ENOBUFS); | |
2719 | } | |
2720 | ||
2721 | io_ring_submit_unlock(req->ctx, needs_lock); | |
2722 | ||
2723 | return kbuf; | |
2724 | } | |
2725 | ||
4d954c25 JA |
2726 | static void __user *io_rw_buffer_select(struct io_kiocb *req, size_t *len, |
2727 | bool needs_lock) | |
2728 | { | |
2729 | struct io_buffer *kbuf; | |
4f4eeba8 | 2730 | u16 bgid; |
4d954c25 JA |
2731 | |
2732 | kbuf = (struct io_buffer *) (unsigned long) req->rw.addr; | |
4f4eeba8 | 2733 | bgid = req->buf_index; |
4d954c25 JA |
2734 | kbuf = io_buffer_select(req, len, bgid, kbuf, needs_lock); |
2735 | if (IS_ERR(kbuf)) | |
2736 | return kbuf; | |
2737 | req->rw.addr = (u64) (unsigned long) kbuf; | |
2738 | req->flags |= REQ_F_BUFFER_SELECTED; | |
2739 | return u64_to_user_ptr(kbuf->addr); | |
2740 | } | |
2741 | ||
2742 | #ifdef CONFIG_COMPAT | |
2743 | static ssize_t io_compat_import(struct io_kiocb *req, struct iovec *iov, | |
2744 | bool needs_lock) | |
2745 | { | |
2746 | struct compat_iovec __user *uiov; | |
2747 | compat_ssize_t clen; | |
2748 | void __user *buf; | |
2749 | ssize_t len; | |
2750 | ||
2751 | uiov = u64_to_user_ptr(req->rw.addr); | |
2752 | if (!access_ok(uiov, sizeof(*uiov))) | |
2753 | return -EFAULT; | |
2754 | if (__get_user(clen, &uiov->iov_len)) | |
2755 | return -EFAULT; | |
2756 | if (clen < 0) | |
2757 | return -EINVAL; | |
2758 | ||
2759 | len = clen; | |
2760 | buf = io_rw_buffer_select(req, &len, needs_lock); | |
2761 | if (IS_ERR(buf)) | |
2762 | return PTR_ERR(buf); | |
2763 | iov[0].iov_base = buf; | |
2764 | iov[0].iov_len = (compat_size_t) len; | |
2765 | return 0; | |
2766 | } | |
2767 | #endif | |
2768 | ||
2769 | static ssize_t __io_iov_buffer_select(struct io_kiocb *req, struct iovec *iov, | |
2770 | bool needs_lock) | |
2771 | { | |
2772 | struct iovec __user *uiov = u64_to_user_ptr(req->rw.addr); | |
2773 | void __user *buf; | |
2774 | ssize_t len; | |
2775 | ||
2776 | if (copy_from_user(iov, uiov, sizeof(*uiov))) | |
2777 | return -EFAULT; | |
2778 | ||
2779 | len = iov[0].iov_len; | |
2780 | if (len < 0) | |
2781 | return -EINVAL; | |
2782 | buf = io_rw_buffer_select(req, &len, needs_lock); | |
2783 | if (IS_ERR(buf)) | |
2784 | return PTR_ERR(buf); | |
2785 | iov[0].iov_base = buf; | |
2786 | iov[0].iov_len = len; | |
2787 | return 0; | |
2788 | } | |
2789 | ||
2790 | static ssize_t io_iov_buffer_select(struct io_kiocb *req, struct iovec *iov, | |
2791 | bool needs_lock) | |
2792 | { | |
dddb3e26 JA |
2793 | if (req->flags & REQ_F_BUFFER_SELECTED) { |
2794 | struct io_buffer *kbuf; | |
2795 | ||
2796 | kbuf = (struct io_buffer *) (unsigned long) req->rw.addr; | |
2797 | iov[0].iov_base = u64_to_user_ptr(kbuf->addr); | |
2798 | iov[0].iov_len = kbuf->len; | |
4d954c25 | 2799 | return 0; |
dddb3e26 | 2800 | } |
4d954c25 JA |
2801 | if (!req->rw.len) |
2802 | return 0; | |
2803 | else if (req->rw.len > 1) | |
2804 | return -EINVAL; | |
2805 | ||
2806 | #ifdef CONFIG_COMPAT | |
2807 | if (req->ctx->compat) | |
2808 | return io_compat_import(req, iov, needs_lock); | |
2809 | #endif | |
2810 | ||
2811 | return __io_iov_buffer_select(req, iov, needs_lock); | |
2812 | } | |
2813 | ||
cf6fd4bd | 2814 | static ssize_t io_import_iovec(int rw, struct io_kiocb *req, |
bcda7baa JA |
2815 | struct iovec **iovec, struct iov_iter *iter, |
2816 | bool needs_lock) | |
2b188cc1 | 2817 | { |
9adbd45d JA |
2818 | void __user *buf = u64_to_user_ptr(req->rw.addr); |
2819 | size_t sqe_len = req->rw.len; | |
4d954c25 | 2820 | ssize_t ret; |
edafccee JA |
2821 | u8 opcode; |
2822 | ||
d625c6ee | 2823 | opcode = req->opcode; |
7d009165 | 2824 | if (opcode == IORING_OP_READ_FIXED || opcode == IORING_OP_WRITE_FIXED) { |
edafccee | 2825 | *iovec = NULL; |
9adbd45d | 2826 | return io_import_fixed(req, rw, iter); |
edafccee | 2827 | } |
2b188cc1 | 2828 | |
bcda7baa | 2829 | /* buffer index only valid with fixed read/write, or buffer select */ |
4f4eeba8 | 2830 | if (req->buf_index && !(req->flags & REQ_F_BUFFER_SELECT)) |
9adbd45d JA |
2831 | return -EINVAL; |
2832 | ||
3a6820f2 | 2833 | if (opcode == IORING_OP_READ || opcode == IORING_OP_WRITE) { |
bcda7baa | 2834 | if (req->flags & REQ_F_BUFFER_SELECT) { |
4d954c25 JA |
2835 | buf = io_rw_buffer_select(req, &sqe_len, needs_lock); |
2836 | if (IS_ERR(buf)) { | |
bcda7baa | 2837 | *iovec = NULL; |
4d954c25 | 2838 | return PTR_ERR(buf); |
bcda7baa | 2839 | } |
3f9d6441 | 2840 | req->rw.len = sqe_len; |
bcda7baa JA |
2841 | } |
2842 | ||
3a6820f2 JA |
2843 | ret = import_single_range(rw, buf, sqe_len, *iovec, iter); |
2844 | *iovec = NULL; | |
3a901598 | 2845 | return ret < 0 ? ret : sqe_len; |
3a6820f2 JA |
2846 | } |
2847 | ||
f67676d1 JA |
2848 | if (req->io) { |
2849 | struct io_async_rw *iorw = &req->io->rw; | |
2850 | ||
252917c3 PB |
2851 | iov_iter_init(iter, rw, iorw->iov, iorw->nr_segs, iorw->size); |
2852 | *iovec = NULL; | |
f67676d1 JA |
2853 | return iorw->size; |
2854 | } | |
2855 | ||
4d954c25 JA |
2856 | if (req->flags & REQ_F_BUFFER_SELECT) { |
2857 | ret = io_iov_buffer_select(req, *iovec, needs_lock); | |
3f9d6441 JA |
2858 | if (!ret) { |
2859 | ret = (*iovec)->iov_len; | |
2860 | iov_iter_init(iter, rw, *iovec, 1, ret); | |
2861 | } | |
4d954c25 JA |
2862 | *iovec = NULL; |
2863 | return ret; | |
2864 | } | |
2865 | ||
2b188cc1 | 2866 | #ifdef CONFIG_COMPAT |
cf6fd4bd | 2867 | if (req->ctx->compat) |
2b188cc1 JA |
2868 | return compat_import_iovec(rw, buf, sqe_len, UIO_FASTIOV, |
2869 | iovec, iter); | |
2870 | #endif | |
2871 | ||
2872 | return import_iovec(rw, buf, sqe_len, UIO_FASTIOV, iovec, iter); | |
2873 | } | |
2874 | ||
31b51510 | 2875 | /* |
32960613 JA |
2876 | * For files that don't have ->read_iter() and ->write_iter(), handle them |
2877 | * by looping over ->read() or ->write() manually. | |
31b51510 | 2878 | */ |
32960613 JA |
2879 | static ssize_t loop_rw_iter(int rw, struct file *file, struct kiocb *kiocb, |
2880 | struct iov_iter *iter) | |
2881 | { | |
2882 | ssize_t ret = 0; | |
2883 | ||
2884 | /* | |
2885 | * Don't support polled IO through this interface, and we can't | |
2886 | * support non-blocking either. For the latter, this just causes | |
2887 | * the kiocb to be handled from an async context. | |
2888 | */ | |
2889 | if (kiocb->ki_flags & IOCB_HIPRI) | |
2890 | return -EOPNOTSUPP; | |
2891 | if (kiocb->ki_flags & IOCB_NOWAIT) | |
2892 | return -EAGAIN; | |
2893 | ||
2894 | while (iov_iter_count(iter)) { | |
311ae9e1 | 2895 | struct iovec iovec; |
32960613 JA |
2896 | ssize_t nr; |
2897 | ||
311ae9e1 PB |
2898 | if (!iov_iter_is_bvec(iter)) { |
2899 | iovec = iov_iter_iovec(iter); | |
2900 | } else { | |
2901 | /* fixed buffers import bvec */ | |
2902 | iovec.iov_base = kmap(iter->bvec->bv_page) | |
2903 | + iter->iov_offset; | |
2904 | iovec.iov_len = min(iter->count, | |
2905 | iter->bvec->bv_len - iter->iov_offset); | |
2906 | } | |
2907 | ||
32960613 JA |
2908 | if (rw == READ) { |
2909 | nr = file->f_op->read(file, iovec.iov_base, | |
2910 | iovec.iov_len, &kiocb->ki_pos); | |
2911 | } else { | |
2912 | nr = file->f_op->write(file, iovec.iov_base, | |
2913 | iovec.iov_len, &kiocb->ki_pos); | |
2914 | } | |
2915 | ||
311ae9e1 PB |
2916 | if (iov_iter_is_bvec(iter)) |
2917 | kunmap(iter->bvec->bv_page); | |
2918 | ||
32960613 JA |
2919 | if (nr < 0) { |
2920 | if (!ret) | |
2921 | ret = nr; | |
2922 | break; | |
2923 | } | |
2924 | ret += nr; | |
2925 | if (nr != iovec.iov_len) | |
2926 | break; | |
2927 | iov_iter_advance(iter, nr); | |
2928 | } | |
2929 | ||
2930 | return ret; | |
2931 | } | |
2932 | ||
b7bb4f7d | 2933 | static void io_req_map_rw(struct io_kiocb *req, ssize_t io_size, |
f67676d1 JA |
2934 | struct iovec *iovec, struct iovec *fast_iov, |
2935 | struct iov_iter *iter) | |
2936 | { | |
b64e3444 PB |
2937 | struct io_async_rw *rw = &req->io->rw; |
2938 | ||
2939 | rw->nr_segs = iter->nr_segs; | |
2940 | rw->size = io_size; | |
2941 | if (!iovec) { | |
2942 | rw->iov = rw->fast_iov; | |
2943 | if (rw->iov != fast_iov) | |
2944 | memcpy(rw->iov, fast_iov, | |
45097dae | 2945 | sizeof(struct iovec) * iter->nr_segs); |
99bc4c38 | 2946 | } else { |
b64e3444 | 2947 | rw->iov = iovec; |
99bc4c38 | 2948 | req->flags |= REQ_F_NEED_CLEANUP; |
f67676d1 JA |
2949 | } |
2950 | } | |
2951 | ||
3d9932a8 XW |
2952 | static inline int __io_alloc_async_ctx(struct io_kiocb *req) |
2953 | { | |
2954 | req->io = kmalloc(sizeof(*req->io), GFP_KERNEL); | |
2955 | return req->io == NULL; | |
2956 | } | |
2957 | ||
b7bb4f7d | 2958 | static int io_alloc_async_ctx(struct io_kiocb *req) |
f67676d1 | 2959 | { |
d3656344 JA |
2960 | if (!io_op_defs[req->opcode].async_ctx) |
2961 | return 0; | |
3d9932a8 XW |
2962 | |
2963 | return __io_alloc_async_ctx(req); | |
b7bb4f7d JA |
2964 | } |
2965 | ||
b7bb4f7d JA |
2966 | static int io_setup_async_rw(struct io_kiocb *req, ssize_t io_size, |
2967 | struct iovec *iovec, struct iovec *fast_iov, | |
2968 | struct iov_iter *iter) | |
2969 | { | |
980ad263 | 2970 | if (!io_op_defs[req->opcode].async_ctx) |
74566df3 | 2971 | return 0; |
5d204bcf | 2972 | if (!req->io) { |
3d9932a8 | 2973 | if (__io_alloc_async_ctx(req)) |
5d204bcf | 2974 | return -ENOMEM; |
b7bb4f7d | 2975 | |
5d204bcf JA |
2976 | io_req_map_rw(req, io_size, iovec, fast_iov, iter); |
2977 | } | |
b7bb4f7d | 2978 | return 0; |
f67676d1 JA |
2979 | } |
2980 | ||
c3e330a4 PB |
2981 | static inline int io_rw_prep_async(struct io_kiocb *req, int rw, |
2982 | bool force_nonblock) | |
2983 | { | |
2984 | struct io_async_ctx *io = req->io; | |
2985 | struct iov_iter iter; | |
2986 | ssize_t ret; | |
2987 | ||
2988 | io->rw.iov = io->rw.fast_iov; | |
2989 | req->io = NULL; | |
2990 | ret = io_import_iovec(rw, req, &io->rw.iov, &iter, !force_nonblock); | |
2991 | req->io = io; | |
2992 | if (unlikely(ret < 0)) | |
2993 | return ret; | |
2994 | ||
2995 | io_req_map_rw(req, ret, io->rw.iov, io->rw.fast_iov, &iter); | |
2996 | return 0; | |
2997 | } | |
2998 | ||
3529d8c2 JA |
2999 | static int io_read_prep(struct io_kiocb *req, const struct io_uring_sqe *sqe, |
3000 | bool force_nonblock) | |
f67676d1 JA |
3001 | { |
3002 | ssize_t ret; | |
3003 | ||
3529d8c2 JA |
3004 | ret = io_prep_rw(req, sqe, force_nonblock); |
3005 | if (ret) | |
3006 | return ret; | |
f67676d1 | 3007 | |
3529d8c2 JA |
3008 | if (unlikely(!(req->file->f_mode & FMODE_READ))) |
3009 | return -EBADF; | |
f67676d1 | 3010 | |
5f798bea PB |
3011 | /* either don't need iovec imported or already have it */ |
3012 | if (!req->io || req->flags & REQ_F_NEED_CLEANUP) | |
3529d8c2 | 3013 | return 0; |
c3e330a4 | 3014 | return io_rw_prep_async(req, READ, force_nonblock); |
f67676d1 JA |
3015 | } |
3016 | ||
c1dd91d1 JA |
3017 | /* |
3018 | * This is our waitqueue callback handler, registered through lock_page_async() | |
3019 | * when we initially tried to do the IO with the iocb armed our waitqueue. | |
3020 | * This gets called when the page is unlocked, and we generally expect that to | |
3021 | * happen when the page IO is completed and the page is now uptodate. This will | |
3022 | * queue a task_work based retry of the operation, attempting to copy the data | |
3023 | * again. If the latter fails because the page was NOT uptodate, then we will | |
3024 | * do a thread based blocking retry of the operation. That's the unexpected | |
3025 | * slow path. | |
3026 | */ | |
bcf5a063 JA |
3027 | static int io_async_buf_func(struct wait_queue_entry *wait, unsigned mode, |
3028 | int sync, void *arg) | |
3029 | { | |
3030 | struct wait_page_queue *wpq; | |
3031 | struct io_kiocb *req = wait->private; | |
bcf5a063 | 3032 | struct wait_page_key *key = arg; |
bcf5a063 JA |
3033 | int ret; |
3034 | ||
3035 | wpq = container_of(wait, struct wait_page_queue, wait); | |
3036 | ||
cdc8fcb4 LT |
3037 | if (!wake_page_match(wpq, key)) |
3038 | return 0; | |
3039 | ||
bcf5a063 JA |
3040 | list_del_init(&wait->entry); |
3041 | ||
e7375122 | 3042 | init_task_work(&req->task_work, io_req_task_submit); |
6d816e08 JA |
3043 | percpu_ref_get(&req->ctx->refs); |
3044 | ||
bcf5a063 JA |
3045 | /* submit ref gets dropped, acquire a new one */ |
3046 | refcount_inc(&req->refs); | |
e7375122 | 3047 | ret = io_req_task_work_add(req, &req->task_work); |
bcf5a063 | 3048 | if (unlikely(ret)) { |
c2c4c83c JA |
3049 | struct task_struct *tsk; |
3050 | ||
bcf5a063 | 3051 | /* queue just for cancelation */ |
e7375122 | 3052 | init_task_work(&req->task_work, io_req_task_cancel); |
bcf5a063 | 3053 | tsk = io_wq_get_task(req->ctx->io_wq); |
e7375122 | 3054 | task_work_add(tsk, &req->task_work, 0); |
c2c4c83c | 3055 | wake_up_process(tsk); |
bcf5a063 | 3056 | } |
bcf5a063 JA |
3057 | return 1; |
3058 | } | |
3059 | ||
cdc8fcb4 LT |
3060 | static inline int kiocb_wait_page_queue_init(struct kiocb *kiocb, |
3061 | struct wait_page_queue *wait, | |
3062 | wait_queue_func_t func, | |
3063 | void *data) | |
3064 | { | |
3065 | /* Can't support async wakeup with polled IO */ | |
3066 | if (kiocb->ki_flags & IOCB_HIPRI) | |
3067 | return -EINVAL; | |
3068 | if (kiocb->ki_filp->f_mode & FMODE_BUF_RASYNC) { | |
3069 | wait->wait.func = func; | |
3070 | wait->wait.private = data; | |
3071 | wait->wait.flags = 0; | |
3072 | INIT_LIST_HEAD(&wait->wait.entry); | |
3073 | kiocb->ki_flags |= IOCB_WAITQ; | |
3074 | kiocb->ki_waitq = wait; | |
3075 | return 0; | |
3076 | } | |
3077 | ||
3078 | return -EOPNOTSUPP; | |
f67676d1 JA |
3079 | } |
3080 | ||
c1dd91d1 JA |
3081 | /* |
3082 | * This controls whether a given IO request should be armed for async page | |
3083 | * based retry. If we return false here, the request is handed to the async | |
3084 | * worker threads for retry. If we're doing buffered reads on a regular file, | |
3085 | * we prepare a private wait_page_queue entry and retry the operation. This | |
3086 | * will either succeed because the page is now uptodate and unlocked, or it | |
3087 | * will register a callback when the page is unlocked at IO completion. Through | |
3088 | * that callback, io_uring uses task_work to setup a retry of the operation. | |
3089 | * That retry will attempt the buffered read again. The retry will generally | |
3090 | * succeed, or in rare cases where it fails, we then fall back to using the | |
3091 | * async worker threads for a blocking retry. | |
3092 | */ | |
bcf5a063 | 3093 | static bool io_rw_should_retry(struct io_kiocb *req) |
f67676d1 | 3094 | { |
bcf5a063 JA |
3095 | struct kiocb *kiocb = &req->rw.kiocb; |
3096 | int ret; | |
f67676d1 | 3097 | |
bcf5a063 JA |
3098 | /* never retry for NOWAIT, we just complete with -EAGAIN */ |
3099 | if (req->flags & REQ_F_NOWAIT) | |
3100 | return false; | |
f67676d1 | 3101 | |
bcf5a063 JA |
3102 | /* already tried, or we're doing O_DIRECT */ |
3103 | if (kiocb->ki_flags & (IOCB_DIRECT | IOCB_WAITQ)) | |
3104 | return false; | |
3105 | /* | |
3106 | * just use poll if we can, and don't attempt if the fs doesn't | |
3107 | * support callback based unlocks | |
3108 | */ | |
3109 | if (file_can_poll(req->file) || !(req->file->f_mode & FMODE_BUF_RASYNC)) | |
3110 | return false; | |
f67676d1 | 3111 | |
bcf5a063 JA |
3112 | /* |
3113 | * If request type doesn't require req->io to defer in general, | |
3114 | * we need to allocate it here | |
3115 | */ | |
3116 | if (!req->io && __io_alloc_async_ctx(req)) | |
3117 | return false; | |
3529d8c2 | 3118 | |
bcf5a063 JA |
3119 | ret = kiocb_wait_page_queue_init(kiocb, &req->io->rw.wpq, |
3120 | io_async_buf_func, req); | |
3121 | if (!ret) { | |
3122 | io_get_req_task(req); | |
3123 | return true; | |
3124 | } | |
3529d8c2 | 3125 | |
bcf5a063 JA |
3126 | return false; |
3127 | } | |
3128 | ||
3129 | static int io_iter_do_read(struct io_kiocb *req, struct iov_iter *iter) | |
3130 | { | |
3131 | if (req->file->f_op->read_iter) | |
3132 | return call_read_iter(req->file, &req->rw.kiocb, iter); | |
2dd2111d GH |
3133 | else if (req->file->f_op->read) |
3134 | return loop_rw_iter(READ, req->file, &req->rw.kiocb, iter); | |
3135 | else | |
3136 | return -EINVAL; | |
f67676d1 JA |
3137 | } |
3138 | ||
a1d7c393 JA |
3139 | static int io_read(struct io_kiocb *req, bool force_nonblock, |
3140 | struct io_comp_state *cs) | |
2b188cc1 JA |
3141 | { |
3142 | struct iovec inline_vecs[UIO_FASTIOV], *iovec = inline_vecs; | |
9adbd45d | 3143 | struct kiocb *kiocb = &req->rw.kiocb; |
2b188cc1 | 3144 | struct iov_iter iter; |
31b51510 | 3145 | size_t iov_count; |
fa15bafb PB |
3146 | ssize_t io_size, ret, ret2; |
3147 | unsigned long nr_segs; | |
2b188cc1 | 3148 | |
bcda7baa | 3149 | ret = io_import_iovec(READ, req, &iovec, &iter, !force_nonblock); |
06b76d44 JA |
3150 | if (ret < 0) |
3151 | return ret; | |
fa15bafb PB |
3152 | io_size = ret; |
3153 | req->result = io_size; | |
2b188cc1 | 3154 | |
fd6c2e4c JA |
3155 | /* Ensure we clear previously set non-block flag */ |
3156 | if (!force_nonblock) | |
29de5f6a | 3157 | kiocb->ki_flags &= ~IOCB_NOWAIT; |
fd6c2e4c | 3158 | |
24c74678 | 3159 | /* If the file doesn't support async, just async punt */ |
af197f50 | 3160 | if (force_nonblock && !io_file_supports_async(req->file, READ)) |
f67676d1 | 3161 | goto copy_iov; |
9e645e11 | 3162 | |
31b51510 | 3163 | iov_count = iov_iter_count(&iter); |
fa15bafb | 3164 | nr_segs = iter.nr_segs; |
9adbd45d | 3165 | ret = rw_verify_area(READ, req->file, &kiocb->ki_pos, iov_count); |
fa15bafb PB |
3166 | if (unlikely(ret)) |
3167 | goto out_free; | |
2b188cc1 | 3168 | |
fa15bafb | 3169 | ret2 = io_iter_do_read(req, &iter); |
32960613 | 3170 | |
fa15bafb PB |
3171 | /* Catch -EAGAIN return for forced non-blocking submission */ |
3172 | if (!force_nonblock || (ret2 != -EAGAIN && ret2 != -EIO)) { | |
3173 | kiocb_done(kiocb, ret2, cs); | |
3174 | } else { | |
3175 | iter.count = iov_count; | |
3176 | iter.nr_segs = nr_segs; | |
f67676d1 | 3177 | copy_iov: |
fa15bafb PB |
3178 | ret = io_setup_async_rw(req, io_size, iovec, inline_vecs, |
3179 | &iter); | |
3180 | if (ret) | |
3181 | goto out_free; | |
3182 | /* it's copied and will be cleaned with ->io */ | |
3183 | iovec = NULL; | |
3184 | /* if we can retry, do so with the callbacks armed */ | |
3185 | if (io_rw_should_retry(req)) { | |
3186 | ret2 = io_iter_do_read(req, &iter); | |
3187 | if (ret2 == -EIOCBQUEUED) { | |
f67676d1 | 3188 | goto out_free; |
fa15bafb PB |
3189 | } else if (ret2 != -EAGAIN) { |
3190 | kiocb_done(kiocb, ret2, cs); | |
f67676d1 | 3191 | goto out_free; |
bcf5a063 | 3192 | } |
f67676d1 | 3193 | } |
fa15bafb PB |
3194 | kiocb->ki_flags &= ~IOCB_WAITQ; |
3195 | return -EAGAIN; | |
2b188cc1 | 3196 | } |
f67676d1 | 3197 | out_free: |
252917c3 | 3198 | if (iovec) |
6f2cc166 | 3199 | kfree(iovec); |
2b188cc1 JA |
3200 | return ret; |
3201 | } | |
3202 | ||
3529d8c2 JA |
3203 | static int io_write_prep(struct io_kiocb *req, const struct io_uring_sqe *sqe, |
3204 | bool force_nonblock) | |
f67676d1 JA |
3205 | { |
3206 | ssize_t ret; | |
3207 | ||
3529d8c2 JA |
3208 | ret = io_prep_rw(req, sqe, force_nonblock); |
3209 | if (ret) | |
3210 | return ret; | |
f67676d1 | 3211 | |
3529d8c2 JA |
3212 | if (unlikely(!(req->file->f_mode & FMODE_WRITE))) |
3213 | return -EBADF; | |
f67676d1 | 3214 | |
5f798bea PB |
3215 | /* either don't need iovec imported or already have it */ |
3216 | if (!req->io || req->flags & REQ_F_NEED_CLEANUP) | |
3529d8c2 | 3217 | return 0; |
c3e330a4 | 3218 | return io_rw_prep_async(req, WRITE, force_nonblock); |
f67676d1 JA |
3219 | } |
3220 | ||
a1d7c393 JA |
3221 | static int io_write(struct io_kiocb *req, bool force_nonblock, |
3222 | struct io_comp_state *cs) | |
2b188cc1 JA |
3223 | { |
3224 | struct iovec inline_vecs[UIO_FASTIOV], *iovec = inline_vecs; | |
9adbd45d | 3225 | struct kiocb *kiocb = &req->rw.kiocb; |
2b188cc1 | 3226 | struct iov_iter iter; |
31b51510 | 3227 | size_t iov_count; |
fa15bafb PB |
3228 | ssize_t ret, ret2, io_size; |
3229 | unsigned long nr_segs; | |
2b188cc1 | 3230 | |
bcda7baa | 3231 | ret = io_import_iovec(WRITE, req, &iovec, &iter, !force_nonblock); |
06b76d44 JA |
3232 | if (ret < 0) |
3233 | return ret; | |
fa15bafb PB |
3234 | io_size = ret; |
3235 | req->result = io_size; | |
2b188cc1 | 3236 | |
fd6c2e4c JA |
3237 | /* Ensure we clear previously set non-block flag */ |
3238 | if (!force_nonblock) | |
9adbd45d | 3239 | req->rw.kiocb.ki_flags &= ~IOCB_NOWAIT; |
fd6c2e4c | 3240 | |
24c74678 | 3241 | /* If the file doesn't support async, just async punt */ |
af197f50 | 3242 | if (force_nonblock && !io_file_supports_async(req->file, WRITE)) |
f67676d1 | 3243 | goto copy_iov; |
31b51510 | 3244 | |
10d59345 JA |
3245 | /* file path doesn't support NOWAIT for non-direct_IO */ |
3246 | if (force_nonblock && !(kiocb->ki_flags & IOCB_DIRECT) && | |
3247 | (req->flags & REQ_F_ISREG)) | |
f67676d1 | 3248 | goto copy_iov; |
31b51510 | 3249 | |
f67676d1 | 3250 | iov_count = iov_iter_count(&iter); |
fa15bafb | 3251 | nr_segs = iter.nr_segs; |
9adbd45d | 3252 | ret = rw_verify_area(WRITE, req->file, &kiocb->ki_pos, iov_count); |
fa15bafb PB |
3253 | if (unlikely(ret)) |
3254 | goto out_free; | |
4ed734b0 | 3255 | |
fa15bafb PB |
3256 | /* |
3257 | * Open-code file_start_write here to grab freeze protection, | |
3258 | * which will be released by another thread in | |
3259 | * io_complete_rw(). Fool lockdep by telling it the lock got | |
3260 | * released so that it doesn't complain about the held lock when | |
3261 | * we return to userspace. | |
3262 | */ | |
3263 | if (req->flags & REQ_F_ISREG) { | |
3264 | __sb_start_write(file_inode(req->file)->i_sb, | |
3265 | SB_FREEZE_WRITE, true); | |
3266 | __sb_writers_release(file_inode(req->file)->i_sb, | |
3267 | SB_FREEZE_WRITE); | |
3268 | } | |
3269 | kiocb->ki_flags |= IOCB_WRITE; | |
4ed734b0 | 3270 | |
fa15bafb PB |
3271 | if (req->file->f_op->write_iter) |
3272 | ret2 = call_write_iter(req->file, kiocb, &iter); | |
2dd2111d | 3273 | else if (req->file->f_op->write) |
fa15bafb | 3274 | ret2 = loop_rw_iter(WRITE, req->file, kiocb, &iter); |
2dd2111d GH |
3275 | else |
3276 | ret2 = -EINVAL; | |
4ed734b0 | 3277 | |
fa15bafb PB |
3278 | /* |
3279 | * Raw bdev writes will return -EOPNOTSUPP for IOCB_NOWAIT. Just | |
3280 | * retry them without IOCB_NOWAIT. | |
3281 | */ | |
3282 | if (ret2 == -EOPNOTSUPP && (kiocb->ki_flags & IOCB_NOWAIT)) | |
3283 | ret2 = -EAGAIN; | |
3284 | if (!force_nonblock || ret2 != -EAGAIN) { | |
3285 | kiocb_done(kiocb, ret2, cs); | |
3286 | } else { | |
3287 | iter.count = iov_count; | |
3288 | iter.nr_segs = nr_segs; | |
f67676d1 | 3289 | copy_iov: |
fa15bafb PB |
3290 | ret = io_setup_async_rw(req, io_size, iovec, inline_vecs, |
3291 | &iter); | |
3292 | if (ret) | |
3293 | goto out_free; | |
3294 | /* it's copied and will be cleaned with ->io */ | |
3295 | iovec = NULL; | |
3296 | return -EAGAIN; | |
2b188cc1 | 3297 | } |
31b51510 | 3298 | out_free: |
252917c3 | 3299 | if (iovec) |
6f2cc166 | 3300 | kfree(iovec); |
2b188cc1 JA |
3301 | return ret; |
3302 | } | |
3303 | ||
f2a8d5c7 PB |
3304 | static int __io_splice_prep(struct io_kiocb *req, |
3305 | const struct io_uring_sqe *sqe) | |
7d67af2c PB |
3306 | { |
3307 | struct io_splice* sp = &req->splice; | |
3308 | unsigned int valid_flags = SPLICE_F_FD_IN_FIXED | SPLICE_F_ALL; | |
3309 | int ret; | |
3310 | ||
3311 | if (req->flags & REQ_F_NEED_CLEANUP) | |
3312 | return 0; | |
3232dd02 PB |
3313 | if (unlikely(req->ctx->flags & IORING_SETUP_IOPOLL)) |
3314 | return -EINVAL; | |
7d67af2c PB |
3315 | |
3316 | sp->file_in = NULL; | |
7d67af2c PB |
3317 | sp->len = READ_ONCE(sqe->len); |
3318 | sp->flags = READ_ONCE(sqe->splice_flags); | |
3319 | ||
3320 | if (unlikely(sp->flags & ~valid_flags)) | |
3321 | return -EINVAL; | |
3322 | ||
3323 | ret = io_file_get(NULL, req, READ_ONCE(sqe->splice_fd_in), &sp->file_in, | |
3324 | (sp->flags & SPLICE_F_FD_IN_FIXED)); | |
3325 | if (ret) | |
3326 | return ret; | |
3327 | req->flags |= REQ_F_NEED_CLEANUP; | |
3328 | ||
7cdaf587 XW |
3329 | if (!S_ISREG(file_inode(sp->file_in)->i_mode)) { |
3330 | /* | |
3331 | * Splice operation will be punted aync, and here need to | |
3332 | * modify io_wq_work.flags, so initialize io_wq_work firstly. | |
3333 | */ | |
3334 | io_req_init_async(req); | |
7d67af2c | 3335 | req->work.flags |= IO_WQ_WORK_UNBOUND; |
7cdaf587 | 3336 | } |
7d67af2c PB |
3337 | |
3338 | return 0; | |
3339 | } | |
3340 | ||
f2a8d5c7 PB |
3341 | static int io_tee_prep(struct io_kiocb *req, |
3342 | const struct io_uring_sqe *sqe) | |
3343 | { | |
3344 | if (READ_ONCE(sqe->splice_off_in) || READ_ONCE(sqe->off)) | |
3345 | return -EINVAL; | |
3346 | return __io_splice_prep(req, sqe); | |
3347 | } | |
3348 | ||
3349 | static int io_tee(struct io_kiocb *req, bool force_nonblock) | |
3350 | { | |
3351 | struct io_splice *sp = &req->splice; | |
3352 | struct file *in = sp->file_in; | |
3353 | struct file *out = sp->file_out; | |
3354 | unsigned int flags = sp->flags & ~SPLICE_F_FD_IN_FIXED; | |
3355 | long ret = 0; | |
3356 | ||
3357 | if (force_nonblock) | |
3358 | return -EAGAIN; | |
3359 | if (sp->len) | |
3360 | ret = do_tee(in, out, sp->len, flags); | |
3361 | ||
3362 | io_put_file(req, in, (sp->flags & SPLICE_F_FD_IN_FIXED)); | |
3363 | req->flags &= ~REQ_F_NEED_CLEANUP; | |
3364 | ||
f2a8d5c7 PB |
3365 | if (ret != sp->len) |
3366 | req_set_fail_links(req); | |
e1e16097 | 3367 | io_req_complete(req, ret); |
f2a8d5c7 PB |
3368 | return 0; |
3369 | } | |
3370 | ||
3371 | static int io_splice_prep(struct io_kiocb *req, const struct io_uring_sqe *sqe) | |
3372 | { | |
3373 | struct io_splice* sp = &req->splice; | |
3374 | ||
3375 | sp->off_in = READ_ONCE(sqe->splice_off_in); | |
3376 | sp->off_out = READ_ONCE(sqe->off); | |
3377 | return __io_splice_prep(req, sqe); | |
3378 | } | |
3379 | ||
014db007 | 3380 | static int io_splice(struct io_kiocb *req, bool force_nonblock) |
7d67af2c PB |
3381 | { |
3382 | struct io_splice *sp = &req->splice; | |
3383 | struct file *in = sp->file_in; | |
3384 | struct file *out = sp->file_out; | |
3385 | unsigned int flags = sp->flags & ~SPLICE_F_FD_IN_FIXED; | |
3386 | loff_t *poff_in, *poff_out; | |
c9687426 | 3387 | long ret = 0; |
7d67af2c | 3388 | |
2fb3e822 PB |
3389 | if (force_nonblock) |
3390 | return -EAGAIN; | |
7d67af2c PB |
3391 | |
3392 | poff_in = (sp->off_in == -1) ? NULL : &sp->off_in; | |
3393 | poff_out = (sp->off_out == -1) ? NULL : &sp->off_out; | |
c9687426 | 3394 | |
948a7749 | 3395 | if (sp->len) |
c9687426 | 3396 | ret = do_splice(in, poff_in, out, poff_out, sp->len, flags); |
7d67af2c PB |
3397 | |
3398 | io_put_file(req, in, (sp->flags & SPLICE_F_FD_IN_FIXED)); | |
3399 | req->flags &= ~REQ_F_NEED_CLEANUP; | |
3400 | ||
7d67af2c PB |
3401 | if (ret != sp->len) |
3402 | req_set_fail_links(req); | |
e1e16097 | 3403 | io_req_complete(req, ret); |
7d67af2c PB |
3404 | return 0; |
3405 | } | |
3406 | ||
2b188cc1 JA |
3407 | /* |
3408 | * IORING_OP_NOP just posts a completion event, nothing else. | |
3409 | */ | |
229a7b63 | 3410 | static int io_nop(struct io_kiocb *req, struct io_comp_state *cs) |
2b188cc1 JA |
3411 | { |
3412 | struct io_ring_ctx *ctx = req->ctx; | |
2b188cc1 | 3413 | |
def596e9 JA |
3414 | if (unlikely(ctx->flags & IORING_SETUP_IOPOLL)) |
3415 | return -EINVAL; | |
3416 | ||
229a7b63 | 3417 | __io_req_complete(req, 0, 0, cs); |
2b188cc1 JA |
3418 | return 0; |
3419 | } | |
3420 | ||
3529d8c2 | 3421 | static int io_prep_fsync(struct io_kiocb *req, const struct io_uring_sqe *sqe) |
c992fe29 | 3422 | { |
6b06314c | 3423 | struct io_ring_ctx *ctx = req->ctx; |
c992fe29 | 3424 | |
09bb8394 JA |
3425 | if (!req->file) |
3426 | return -EBADF; | |
c992fe29 | 3427 | |
6b06314c | 3428 | if (unlikely(ctx->flags & IORING_SETUP_IOPOLL)) |
def596e9 | 3429 | return -EINVAL; |
edafccee | 3430 | if (unlikely(sqe->addr || sqe->ioprio || sqe->buf_index)) |
c992fe29 CH |
3431 | return -EINVAL; |
3432 | ||
8ed8d3c3 JA |
3433 | req->sync.flags = READ_ONCE(sqe->fsync_flags); |
3434 | if (unlikely(req->sync.flags & ~IORING_FSYNC_DATASYNC)) | |
3435 | return -EINVAL; | |
3436 | ||
3437 | req->sync.off = READ_ONCE(sqe->off); | |
3438 | req->sync.len = READ_ONCE(sqe->len); | |
c992fe29 CH |
3439 | return 0; |
3440 | } | |
3441 | ||
ac45abc0 | 3442 | static int io_fsync(struct io_kiocb *req, bool force_nonblock) |
8ed8d3c3 | 3443 | { |
8ed8d3c3 | 3444 | loff_t end = req->sync.off + req->sync.len; |
8ed8d3c3 JA |
3445 | int ret; |
3446 | ||
ac45abc0 PB |
3447 | /* fsync always requires a blocking context */ |
3448 | if (force_nonblock) | |
3449 | return -EAGAIN; | |
3450 | ||
9adbd45d | 3451 | ret = vfs_fsync_range(req->file, req->sync.off, |
8ed8d3c3 JA |
3452 | end > 0 ? end : LLONG_MAX, |
3453 | req->sync.flags & IORING_FSYNC_DATASYNC); | |
3454 | if (ret < 0) | |
3455 | req_set_fail_links(req); | |
e1e16097 | 3456 | io_req_complete(req, ret); |
c992fe29 CH |
3457 | return 0; |
3458 | } | |
3459 | ||
d63d1b5e JA |
3460 | static int io_fallocate_prep(struct io_kiocb *req, |
3461 | const struct io_uring_sqe *sqe) | |
3462 | { | |
3463 | if (sqe->ioprio || sqe->buf_index || sqe->rw_flags) | |
3464 | return -EINVAL; | |
3232dd02 PB |
3465 | if (unlikely(req->ctx->flags & IORING_SETUP_IOPOLL)) |
3466 | return -EINVAL; | |
d63d1b5e JA |
3467 | |
3468 | req->sync.off = READ_ONCE(sqe->off); | |
3469 | req->sync.len = READ_ONCE(sqe->addr); | |
3470 | req->sync.mode = READ_ONCE(sqe->len); | |
3471 | return 0; | |
3472 | } | |
3473 | ||
014db007 | 3474 | static int io_fallocate(struct io_kiocb *req, bool force_nonblock) |
5d17b4a4 | 3475 | { |
ac45abc0 PB |
3476 | int ret; |
3477 | ||
d63d1b5e | 3478 | /* fallocate always requiring blocking context */ |
ac45abc0 | 3479 | if (force_nonblock) |
5d17b4a4 | 3480 | return -EAGAIN; |
ac45abc0 PB |
3481 | ret = vfs_fallocate(req->file, req->sync.mode, req->sync.off, |
3482 | req->sync.len); | |
ac45abc0 PB |
3483 | if (ret < 0) |
3484 | req_set_fail_links(req); | |
e1e16097 | 3485 | io_req_complete(req, ret); |
5d17b4a4 JA |
3486 | return 0; |
3487 | } | |
3488 | ||
ec65fea5 | 3489 | static int __io_openat_prep(struct io_kiocb *req, const struct io_uring_sqe *sqe) |
b7bb4f7d | 3490 | { |
f8748881 | 3491 | const char __user *fname; |
15b71abe | 3492 | int ret; |
b7bb4f7d | 3493 | |
3232dd02 | 3494 | if (unlikely(req->ctx->flags & (IORING_SETUP_IOPOLL|IORING_SETUP_SQPOLL))) |
15b71abe | 3495 | return -EINVAL; |
ec65fea5 | 3496 | if (unlikely(sqe->ioprio || sqe->buf_index)) |
15b71abe | 3497 | return -EINVAL; |
ec65fea5 | 3498 | if (unlikely(req->flags & REQ_F_FIXED_FILE)) |
cf3040ca | 3499 | return -EBADF; |
03b1230c | 3500 | |
ec65fea5 PB |
3501 | /* open.how should be already initialised */ |
3502 | if (!(req->open.how.flags & O_PATH) && force_o_largefile()) | |
08a1d26e | 3503 | req->open.how.flags |= O_LARGEFILE; |
3529d8c2 | 3504 | |
25e72d10 PB |
3505 | req->open.dfd = READ_ONCE(sqe->fd); |
3506 | fname = u64_to_user_ptr(READ_ONCE(sqe->addr)); | |
f8748881 | 3507 | req->open.filename = getname(fname); |
15b71abe JA |
3508 | if (IS_ERR(req->open.filename)) { |
3509 | ret = PTR_ERR(req->open.filename); | |
3510 | req->open.filename = NULL; | |
3511 | return ret; | |
3512 | } | |
4022e7af | 3513 | req->open.nofile = rlimit(RLIMIT_NOFILE); |
8fef80bf | 3514 | req->flags |= REQ_F_NEED_CLEANUP; |
15b71abe | 3515 | return 0; |
03b1230c JA |
3516 | } |
3517 | ||
ec65fea5 PB |
3518 | static int io_openat_prep(struct io_kiocb *req, const struct io_uring_sqe *sqe) |
3519 | { | |
3520 | u64 flags, mode; | |
3521 | ||
3522 | if (req->flags & REQ_F_NEED_CLEANUP) | |
3523 | return 0; | |
3524 | mode = READ_ONCE(sqe->len); | |
3525 | flags = READ_ONCE(sqe->open_flags); | |
3526 | req->open.how = build_open_how(flags, mode); | |
3527 | return __io_openat_prep(req, sqe); | |
3528 | } | |
3529 | ||
cebdb986 | 3530 | static int io_openat2_prep(struct io_kiocb *req, const struct io_uring_sqe *sqe) |
aa1fa28f | 3531 | { |
cebdb986 | 3532 | struct open_how __user *how; |
cebdb986 | 3533 | size_t len; |
0fa03c62 JA |
3534 | int ret; |
3535 | ||
0bdbdd08 PB |
3536 | if (req->flags & REQ_F_NEED_CLEANUP) |
3537 | return 0; | |
cebdb986 JA |
3538 | how = u64_to_user_ptr(READ_ONCE(sqe->addr2)); |
3539 | len = READ_ONCE(sqe->len); | |
cebdb986 JA |
3540 | if (len < OPEN_HOW_SIZE_VER0) |
3541 | return -EINVAL; | |
3529d8c2 | 3542 | |
cebdb986 JA |
3543 | ret = copy_struct_from_user(&req->open.how, sizeof(req->open.how), how, |
3544 | len); | |
3545 | if (ret) | |
3546 | return ret; | |
3529d8c2 | 3547 | |
ec65fea5 | 3548 | return __io_openat_prep(req, sqe); |
cebdb986 JA |
3549 | } |
3550 | ||
014db007 | 3551 | static int io_openat2(struct io_kiocb *req, bool force_nonblock) |
15b71abe JA |
3552 | { |
3553 | struct open_flags op; | |
15b71abe JA |
3554 | struct file *file; |
3555 | int ret; | |
3556 | ||
f86cd20c | 3557 | if (force_nonblock) |
15b71abe | 3558 | return -EAGAIN; |
15b71abe | 3559 | |
cebdb986 | 3560 | ret = build_open_flags(&req->open.how, &op); |
15b71abe JA |
3561 | if (ret) |
3562 | goto err; | |
3563 | ||
4022e7af | 3564 | ret = __get_unused_fd_flags(req->open.how.flags, req->open.nofile); |
15b71abe JA |
3565 | if (ret < 0) |
3566 | goto err; | |
3567 | ||
3568 | file = do_filp_open(req->open.dfd, req->open.filename, &op); | |
3569 | if (IS_ERR(file)) { | |
3570 | put_unused_fd(ret); | |
3571 | ret = PTR_ERR(file); | |
3572 | } else { | |
3573 | fsnotify_open(file); | |
3574 | fd_install(ret, file); | |
3575 | } | |
3576 | err: | |
3577 | putname(req->open.filename); | |
8fef80bf | 3578 | req->flags &= ~REQ_F_NEED_CLEANUP; |
15b71abe JA |
3579 | if (ret < 0) |
3580 | req_set_fail_links(req); | |
e1e16097 | 3581 | io_req_complete(req, ret); |
15b71abe JA |
3582 | return 0; |
3583 | } | |
3584 | ||
014db007 | 3585 | static int io_openat(struct io_kiocb *req, bool force_nonblock) |
cebdb986 | 3586 | { |
014db007 | 3587 | return io_openat2(req, force_nonblock); |
cebdb986 JA |
3588 | } |
3589 | ||
067524e9 JA |
3590 | static int io_remove_buffers_prep(struct io_kiocb *req, |
3591 | const struct io_uring_sqe *sqe) | |
3592 | { | |
3593 | struct io_provide_buf *p = &req->pbuf; | |
3594 | u64 tmp; | |
3595 | ||
3596 | if (sqe->ioprio || sqe->rw_flags || sqe->addr || sqe->len || sqe->off) | |
3597 | return -EINVAL; | |
3598 | ||
3599 | tmp = READ_ONCE(sqe->fd); | |
3600 | if (!tmp || tmp > USHRT_MAX) | |
3601 | return -EINVAL; | |
3602 | ||
3603 | memset(p, 0, sizeof(*p)); | |
3604 | p->nbufs = tmp; | |
3605 | p->bgid = READ_ONCE(sqe->buf_group); | |
3606 | return 0; | |
3607 | } | |
3608 | ||
3609 | static int __io_remove_buffers(struct io_ring_ctx *ctx, struct io_buffer *buf, | |
3610 | int bgid, unsigned nbufs) | |
3611 | { | |
3612 | unsigned i = 0; | |
3613 | ||
3614 | /* shouldn't happen */ | |
3615 | if (!nbufs) | |
3616 | return 0; | |
3617 | ||
3618 | /* the head kbuf is the list itself */ | |
3619 | while (!list_empty(&buf->list)) { | |
3620 | struct io_buffer *nxt; | |
3621 | ||
3622 | nxt = list_first_entry(&buf->list, struct io_buffer, list); | |
3623 | list_del(&nxt->list); | |
3624 | kfree(nxt); | |
3625 | if (++i == nbufs) | |
3626 | return i; | |
3627 | } | |
3628 | i++; | |
3629 | kfree(buf); | |
3630 | idr_remove(&ctx->io_buffer_idr, bgid); | |
3631 | ||
3632 | return i; | |
3633 | } | |
3634 | ||
229a7b63 JA |
3635 | static int io_remove_buffers(struct io_kiocb *req, bool force_nonblock, |
3636 | struct io_comp_state *cs) | |
067524e9 JA |
3637 | { |
3638 | struct io_provide_buf *p = &req->pbuf; | |
3639 | struct io_ring_ctx *ctx = req->ctx; | |
3640 | struct io_buffer *head; | |
3641 | int ret = 0; | |
3642 | ||
3643 | io_ring_submit_lock(ctx, !force_nonblock); | |
3644 | ||
3645 | lockdep_assert_held(&ctx->uring_lock); | |
3646 | ||
3647 | ret = -ENOENT; | |
3648 | head = idr_find(&ctx->io_buffer_idr, p->bgid); | |
3649 | if (head) | |
3650 | ret = __io_remove_buffers(ctx, head, p->bgid, p->nbufs); | |
3651 | ||
3652 | io_ring_submit_lock(ctx, !force_nonblock); | |
3653 | if (ret < 0) | |
3654 | req_set_fail_links(req); | |
229a7b63 | 3655 | __io_req_complete(req, ret, 0, cs); |
067524e9 JA |
3656 | return 0; |
3657 | } | |
3658 | ||
ddf0322d JA |
3659 | static int io_provide_buffers_prep(struct io_kiocb *req, |
3660 | const struct io_uring_sqe *sqe) | |
3661 | { | |
3662 | struct io_provide_buf *p = &req->pbuf; | |
3663 | u64 tmp; | |
3664 | ||
3665 | if (sqe->ioprio || sqe->rw_flags) | |
3666 | return -EINVAL; | |
3667 | ||
3668 | tmp = READ_ONCE(sqe->fd); | |
3669 | if (!tmp || tmp > USHRT_MAX) | |
3670 | return -E2BIG; | |
3671 | p->nbufs = tmp; | |
3672 | p->addr = READ_ONCE(sqe->addr); | |
3673 | p->len = READ_ONCE(sqe->len); | |
3674 | ||
efe68c1c | 3675 | if (!access_ok(u64_to_user_ptr(p->addr), (p->len * p->nbufs))) |
ddf0322d JA |
3676 | return -EFAULT; |
3677 | ||
3678 | p->bgid = READ_ONCE(sqe->buf_group); | |
3679 | tmp = READ_ONCE(sqe->off); | |
3680 | if (tmp > USHRT_MAX) | |
3681 | return -E2BIG; | |
3682 | p->bid = tmp; | |
3683 | return 0; | |
3684 | } | |
3685 | ||
3686 | static int io_add_buffers(struct io_provide_buf *pbuf, struct io_buffer **head) | |
3687 | { | |
3688 | struct io_buffer *buf; | |
3689 | u64 addr = pbuf->addr; | |
3690 | int i, bid = pbuf->bid; | |
3691 | ||
3692 | for (i = 0; i < pbuf->nbufs; i++) { | |
3693 | buf = kmalloc(sizeof(*buf), GFP_KERNEL); | |
3694 | if (!buf) | |
3695 | break; | |
3696 | ||
3697 | buf->addr = addr; | |
3698 | buf->len = pbuf->len; | |
3699 | buf->bid = bid; | |
3700 | addr += pbuf->len; | |
3701 | bid++; | |
3702 | if (!*head) { | |
3703 | INIT_LIST_HEAD(&buf->list); | |
3704 | *head = buf; | |
3705 | } else { | |
3706 | list_add_tail(&buf->list, &(*head)->list); | |
3707 | } | |
3708 | } | |
3709 | ||
3710 | return i ? i : -ENOMEM; | |
3711 | } | |
3712 | ||
229a7b63 JA |
3713 | static int io_provide_buffers(struct io_kiocb *req, bool force_nonblock, |
3714 | struct io_comp_state *cs) | |
ddf0322d JA |
3715 | { |
3716 | struct io_provide_buf *p = &req->pbuf; | |
3717 | struct io_ring_ctx *ctx = req->ctx; | |
3718 | struct io_buffer *head, *list; | |
3719 | int ret = 0; | |
3720 | ||
3721 | io_ring_submit_lock(ctx, !force_nonblock); | |
3722 | ||
3723 | lockdep_assert_held(&ctx->uring_lock); | |
3724 | ||
3725 | list = head = idr_find(&ctx->io_buffer_idr, p->bgid); | |
3726 | ||
3727 | ret = io_add_buffers(p, &head); | |
3728 | if (ret < 0) | |
3729 | goto out; | |
3730 | ||
3731 | if (!list) { | |
3732 | ret = idr_alloc(&ctx->io_buffer_idr, head, p->bgid, p->bgid + 1, | |
3733 | GFP_KERNEL); | |
3734 | if (ret < 0) { | |
067524e9 | 3735 | __io_remove_buffers(ctx, head, p->bgid, -1U); |
ddf0322d JA |
3736 | goto out; |
3737 | } | |
3738 | } | |
3739 | out: | |
3740 | io_ring_submit_unlock(ctx, !force_nonblock); | |
3741 | if (ret < 0) | |
3742 | req_set_fail_links(req); | |
229a7b63 | 3743 | __io_req_complete(req, ret, 0, cs); |
ddf0322d | 3744 | return 0; |
cebdb986 JA |
3745 | } |
3746 | ||
3e4827b0 JA |
3747 | static int io_epoll_ctl_prep(struct io_kiocb *req, |
3748 | const struct io_uring_sqe *sqe) | |
3749 | { | |
3750 | #if defined(CONFIG_EPOLL) | |
3751 | if (sqe->ioprio || sqe->buf_index) | |
3752 | return -EINVAL; | |
3232dd02 PB |
3753 | if (unlikely(req->ctx->flags & IORING_SETUP_IOPOLL)) |
3754 | return -EINVAL; | |
3e4827b0 JA |
3755 | |
3756 | req->epoll.epfd = READ_ONCE(sqe->fd); | |
3757 | req->epoll.op = READ_ONCE(sqe->len); | |
3758 | req->epoll.fd = READ_ONCE(sqe->off); | |
3759 | ||
3760 | if (ep_op_has_event(req->epoll.op)) { | |
3761 | struct epoll_event __user *ev; | |
3762 | ||
3763 | ev = u64_to_user_ptr(READ_ONCE(sqe->addr)); | |
3764 | if (copy_from_user(&req->epoll.event, ev, sizeof(*ev))) | |
3765 | return -EFAULT; | |
3766 | } | |
3767 | ||
3768 | return 0; | |
3769 | #else | |
3770 | return -EOPNOTSUPP; | |
3771 | #endif | |
3772 | } | |
3773 | ||
229a7b63 JA |
3774 | static int io_epoll_ctl(struct io_kiocb *req, bool force_nonblock, |
3775 | struct io_comp_state *cs) | |
3e4827b0 JA |
3776 | { |
3777 | #if defined(CONFIG_EPOLL) | |
3778 | struct io_epoll *ie = &req->epoll; | |
3779 | int ret; | |
3780 | ||
3781 | ret = do_epoll_ctl(ie->epfd, ie->op, ie->fd, &ie->event, force_nonblock); | |
3782 | if (force_nonblock && ret == -EAGAIN) | |
3783 | return -EAGAIN; | |
3784 | ||
3785 | if (ret < 0) | |
3786 | req_set_fail_links(req); | |
229a7b63 | 3787 | __io_req_complete(req, ret, 0, cs); |
3e4827b0 JA |
3788 | return 0; |
3789 | #else | |
3790 | return -EOPNOTSUPP; | |
3791 | #endif | |
3792 | } | |
3793 | ||
c1ca757b JA |
3794 | static int io_madvise_prep(struct io_kiocb *req, const struct io_uring_sqe *sqe) |
3795 | { | |
3796 | #if defined(CONFIG_ADVISE_SYSCALLS) && defined(CONFIG_MMU) | |
3797 | if (sqe->ioprio || sqe->buf_index || sqe->off) | |
3798 | return -EINVAL; | |
3232dd02 PB |
3799 | if (unlikely(req->ctx->flags & IORING_SETUP_IOPOLL)) |
3800 | return -EINVAL; | |
c1ca757b JA |
3801 | |
3802 | req->madvise.addr = READ_ONCE(sqe->addr); | |
3803 | req->madvise.len = READ_ONCE(sqe->len); | |
3804 | req->madvise.advice = READ_ONCE(sqe->fadvise_advice); | |
3805 | return 0; | |
3806 | #else | |
3807 | return -EOPNOTSUPP; | |
3808 | #endif | |
3809 | } | |
3810 | ||
014db007 | 3811 | static int io_madvise(struct io_kiocb *req, bool force_nonblock) |
c1ca757b JA |
3812 | { |
3813 | #if defined(CONFIG_ADVISE_SYSCALLS) && defined(CONFIG_MMU) | |
3814 | struct io_madvise *ma = &req->madvise; | |
3815 | int ret; | |
3816 | ||
3817 | if (force_nonblock) | |
3818 | return -EAGAIN; | |
3819 | ||
3820 | ret = do_madvise(ma->addr, ma->len, ma->advice); | |
3821 | if (ret < 0) | |
3822 | req_set_fail_links(req); | |
e1e16097 | 3823 | io_req_complete(req, ret); |
c1ca757b JA |
3824 | return 0; |
3825 | #else | |
3826 | return -EOPNOTSUPP; | |
3827 | #endif | |
3828 | } | |
3829 | ||
4840e418 JA |
3830 | static int io_fadvise_prep(struct io_kiocb *req, const struct io_uring_sqe *sqe) |
3831 | { | |
3832 | if (sqe->ioprio || sqe->buf_index || sqe->addr) | |
3833 | return -EINVAL; | |
3232dd02 PB |
3834 | if (unlikely(req->ctx->flags & IORING_SETUP_IOPOLL)) |
3835 | return -EINVAL; | |
4840e418 JA |
3836 | |
3837 | req->fadvise.offset = READ_ONCE(sqe->off); | |
3838 | req->fadvise.len = READ_ONCE(sqe->len); | |
3839 | req->fadvise.advice = READ_ONCE(sqe->fadvise_advice); | |
3840 | return 0; | |
3841 | } | |
3842 | ||
014db007 | 3843 | static int io_fadvise(struct io_kiocb *req, bool force_nonblock) |
4840e418 JA |
3844 | { |
3845 | struct io_fadvise *fa = &req->fadvise; | |
3846 | int ret; | |
3847 | ||
3e69426d JA |
3848 | if (force_nonblock) { |
3849 | switch (fa->advice) { | |
3850 | case POSIX_FADV_NORMAL: | |
3851 | case POSIX_FADV_RANDOM: | |
3852 | case POSIX_FADV_SEQUENTIAL: | |
3853 | break; | |
3854 | default: | |
3855 | return -EAGAIN; | |
3856 | } | |
3857 | } | |
4840e418 JA |
3858 | |
3859 | ret = vfs_fadvise(req->file, fa->offset, fa->len, fa->advice); | |
3860 | if (ret < 0) | |
3861 | req_set_fail_links(req); | |
e1e16097 | 3862 | io_req_complete(req, ret); |
4840e418 JA |
3863 | return 0; |
3864 | } | |
3865 | ||
eddc7ef5 JA |
3866 | static int io_statx_prep(struct io_kiocb *req, const struct io_uring_sqe *sqe) |
3867 | { | |
3232dd02 PB |
3868 | if (unlikely(req->ctx->flags & IORING_SETUP_IOPOLL)) |
3869 | return -EINVAL; | |
eddc7ef5 JA |
3870 | if (sqe->ioprio || sqe->buf_index) |
3871 | return -EINVAL; | |
9c280f90 | 3872 | if (req->flags & REQ_F_FIXED_FILE) |
cf3040ca | 3873 | return -EBADF; |
eddc7ef5 | 3874 | |
1d9e1288 BM |
3875 | req->statx.dfd = READ_ONCE(sqe->fd); |
3876 | req->statx.mask = READ_ONCE(sqe->len); | |
e62753e4 | 3877 | req->statx.filename = u64_to_user_ptr(READ_ONCE(sqe->addr)); |
1d9e1288 BM |
3878 | req->statx.buffer = u64_to_user_ptr(READ_ONCE(sqe->addr2)); |
3879 | req->statx.flags = READ_ONCE(sqe->statx_flags); | |
eddc7ef5 JA |
3880 | |
3881 | return 0; | |
3882 | } | |
3883 | ||
014db007 | 3884 | static int io_statx(struct io_kiocb *req, bool force_nonblock) |
eddc7ef5 | 3885 | { |
1d9e1288 | 3886 | struct io_statx *ctx = &req->statx; |
eddc7ef5 JA |
3887 | int ret; |
3888 | ||
5b0bbee4 JA |
3889 | if (force_nonblock) { |
3890 | /* only need file table for an actual valid fd */ | |
3891 | if (ctx->dfd == -1 || ctx->dfd == AT_FDCWD) | |
3892 | req->flags |= REQ_F_NO_FILE_TABLE; | |
eddc7ef5 | 3893 | return -EAGAIN; |
5b0bbee4 | 3894 | } |
eddc7ef5 | 3895 | |
e62753e4 BM |
3896 | ret = do_statx(ctx->dfd, ctx->filename, ctx->flags, ctx->mask, |
3897 | ctx->buffer); | |
eddc7ef5 | 3898 | |
eddc7ef5 JA |
3899 | if (ret < 0) |
3900 | req_set_fail_links(req); | |
e1e16097 | 3901 | io_req_complete(req, ret); |
eddc7ef5 JA |
3902 | return 0; |
3903 | } | |
3904 | ||
b5dba59e JA |
3905 | static int io_close_prep(struct io_kiocb *req, const struct io_uring_sqe *sqe) |
3906 | { | |
3907 | /* | |
3908 | * If we queue this for async, it must not be cancellable. That would | |
7cdaf587 XW |
3909 | * leave the 'file' in an undeterminate state, and here need to modify |
3910 | * io_wq_work.flags, so initialize io_wq_work firstly. | |
b5dba59e | 3911 | */ |
7cdaf587 | 3912 | io_req_init_async(req); |
b5dba59e JA |
3913 | req->work.flags |= IO_WQ_WORK_NO_CANCEL; |
3914 | ||
3232dd02 PB |
3915 | if (unlikely(req->ctx->flags & (IORING_SETUP_IOPOLL|IORING_SETUP_SQPOLL))) |
3916 | return -EINVAL; | |
b5dba59e JA |
3917 | if (sqe->ioprio || sqe->off || sqe->addr || sqe->len || |
3918 | sqe->rw_flags || sqe->buf_index) | |
3919 | return -EINVAL; | |
9c280f90 | 3920 | if (req->flags & REQ_F_FIXED_FILE) |
cf3040ca | 3921 | return -EBADF; |
b5dba59e JA |
3922 | |
3923 | req->close.fd = READ_ONCE(sqe->fd); | |
fd2206e4 JA |
3924 | if ((req->file && req->file->f_op == &io_uring_fops) || |
3925 | req->close.fd == req->ctx->ring_fd) | |
3926 | return -EBADF; | |
b5dba59e | 3927 | |
3af73b28 | 3928 | req->close.put_file = NULL; |
b5dba59e | 3929 | return 0; |
b5dba59e JA |
3930 | } |
3931 | ||
229a7b63 JA |
3932 | static int io_close(struct io_kiocb *req, bool force_nonblock, |
3933 | struct io_comp_state *cs) | |
b5dba59e | 3934 | { |
3af73b28 | 3935 | struct io_close *close = &req->close; |
b5dba59e JA |
3936 | int ret; |
3937 | ||
3af73b28 PB |
3938 | /* might be already done during nonblock submission */ |
3939 | if (!close->put_file) { | |
3940 | ret = __close_fd_get_file(close->fd, &close->put_file); | |
3941 | if (ret < 0) | |
3942 | return (ret == -ENOENT) ? -EBADF : ret; | |
3943 | } | |
b5dba59e JA |
3944 | |
3945 | /* if the file has a flush method, be safe and punt to async */ | |
3af73b28 | 3946 | if (close->put_file->f_op->flush && force_nonblock) { |
24c74678 PB |
3947 | /* was never set, but play safe */ |
3948 | req->flags &= ~REQ_F_NOWAIT; | |
0bf0eefd | 3949 | /* avoid grabbing files - we don't need the files */ |
24c74678 | 3950 | req->flags |= REQ_F_NO_FILE_TABLE; |
0bf0eefd | 3951 | return -EAGAIN; |
a2100672 | 3952 | } |
b5dba59e | 3953 | |
3af73b28 PB |
3954 | /* No ->flush() or already async, safely close from here */ |
3955 | ret = filp_close(close->put_file, req->work.files); | |
3956 | if (ret < 0) | |
3957 | req_set_fail_links(req); | |
3af73b28 PB |
3958 | fput(close->put_file); |
3959 | close->put_file = NULL; | |
229a7b63 | 3960 | __io_req_complete(req, ret, 0, cs); |
1a417f4e | 3961 | return 0; |
b5dba59e JA |
3962 | } |
3963 | ||
3529d8c2 | 3964 | static int io_prep_sfr(struct io_kiocb *req, const struct io_uring_sqe *sqe) |
5d17b4a4 JA |
3965 | { |
3966 | struct io_ring_ctx *ctx = req->ctx; | |
5d17b4a4 JA |
3967 | |
3968 | if (!req->file) | |
3969 | return -EBADF; | |
5d17b4a4 JA |
3970 | |
3971 | if (unlikely(ctx->flags & IORING_SETUP_IOPOLL)) | |
3972 | return -EINVAL; | |
3973 | if (unlikely(sqe->addr || sqe->ioprio || sqe->buf_index)) | |
3974 | return -EINVAL; | |
3975 | ||
8ed8d3c3 JA |
3976 | req->sync.off = READ_ONCE(sqe->off); |
3977 | req->sync.len = READ_ONCE(sqe->len); | |
3978 | req->sync.flags = READ_ONCE(sqe->sync_range_flags); | |
8ed8d3c3 JA |
3979 | return 0; |
3980 | } | |
3981 | ||
ac45abc0 | 3982 | static int io_sync_file_range(struct io_kiocb *req, bool force_nonblock) |
8ed8d3c3 | 3983 | { |
8ed8d3c3 JA |
3984 | int ret; |
3985 | ||
ac45abc0 PB |
3986 | /* sync_file_range always requires a blocking context */ |
3987 | if (force_nonblock) | |
3988 | return -EAGAIN; | |
3989 | ||
9adbd45d | 3990 | ret = sync_file_range(req->file, req->sync.off, req->sync.len, |
8ed8d3c3 JA |
3991 | req->sync.flags); |
3992 | if (ret < 0) | |
3993 | req_set_fail_links(req); | |
e1e16097 | 3994 | io_req_complete(req, ret); |
5d17b4a4 JA |
3995 | return 0; |
3996 | } | |
3997 | ||
469956e8 | 3998 | #if defined(CONFIG_NET) |
02d27d89 PB |
3999 | static int io_setup_async_msg(struct io_kiocb *req, |
4000 | struct io_async_msghdr *kmsg) | |
4001 | { | |
4002 | if (req->io) | |
4003 | return -EAGAIN; | |
4004 | if (io_alloc_async_ctx(req)) { | |
4005 | if (kmsg->iov != kmsg->fast_iov) | |
4006 | kfree(kmsg->iov); | |
4007 | return -ENOMEM; | |
4008 | } | |
4009 | req->flags |= REQ_F_NEED_CLEANUP; | |
4010 | memcpy(&req->io->msg, kmsg, sizeof(*kmsg)); | |
4011 | return -EAGAIN; | |
4012 | } | |
4013 | ||
2ae523ed PB |
4014 | static int io_sendmsg_copy_hdr(struct io_kiocb *req, |
4015 | struct io_async_msghdr *iomsg) | |
4016 | { | |
4017 | iomsg->iov = iomsg->fast_iov; | |
4018 | iomsg->msg.msg_name = &iomsg->addr; | |
4019 | return sendmsg_copy_msghdr(&iomsg->msg, req->sr_msg.umsg, | |
4020 | req->sr_msg.msg_flags, &iomsg->iov); | |
4021 | } | |
4022 | ||
3529d8c2 | 4023 | static int io_sendmsg_prep(struct io_kiocb *req, const struct io_uring_sqe *sqe) |
03b1230c | 4024 | { |
e47293fd | 4025 | struct io_sr_msg *sr = &req->sr_msg; |
3529d8c2 | 4026 | struct io_async_ctx *io = req->io; |
99bc4c38 | 4027 | int ret; |
03b1230c | 4028 | |
d2b6f48b PB |
4029 | if (unlikely(req->ctx->flags & IORING_SETUP_IOPOLL)) |
4030 | return -EINVAL; | |
4031 | ||
e47293fd | 4032 | sr->msg_flags = READ_ONCE(sqe->msg_flags); |
270a5940 | 4033 | sr->umsg = u64_to_user_ptr(READ_ONCE(sqe->addr)); |
fddaface | 4034 | sr->len = READ_ONCE(sqe->len); |
3529d8c2 | 4035 | |
d8768362 JA |
4036 | #ifdef CONFIG_COMPAT |
4037 | if (req->ctx->compat) | |
4038 | sr->msg_flags |= MSG_CMSG_COMPAT; | |
4039 | #endif | |
4040 | ||
fddaface | 4041 | if (!io || req->opcode == IORING_OP_SEND) |
3529d8c2 | 4042 | return 0; |
5f798bea PB |
4043 | /* iovec is already imported */ |
4044 | if (req->flags & REQ_F_NEED_CLEANUP) | |
4045 | return 0; | |
3529d8c2 | 4046 | |
2ae523ed | 4047 | ret = io_sendmsg_copy_hdr(req, &io->msg); |
99bc4c38 PB |
4048 | if (!ret) |
4049 | req->flags |= REQ_F_NEED_CLEANUP; | |
4050 | return ret; | |
03b1230c JA |
4051 | } |
4052 | ||
229a7b63 JA |
4053 | static int io_sendmsg(struct io_kiocb *req, bool force_nonblock, |
4054 | struct io_comp_state *cs) | |
aa1fa28f | 4055 | { |
6b754c8b | 4056 | struct io_async_msghdr iomsg, *kmsg; |
0fa03c62 | 4057 | struct socket *sock; |
7a7cacba | 4058 | unsigned flags; |
0fa03c62 JA |
4059 | int ret; |
4060 | ||
0fa03c62 | 4061 | sock = sock_from_file(req->file, &ret); |
7a7cacba PB |
4062 | if (unlikely(!sock)) |
4063 | return ret; | |
3529d8c2 | 4064 | |
7a7cacba PB |
4065 | if (req->io) { |
4066 | kmsg = &req->io->msg; | |
4067 | kmsg->msg.msg_name = &req->io->msg.addr; | |
4068 | /* if iov is set, it's allocated already */ | |
4069 | if (!kmsg->iov) | |
4070 | kmsg->iov = kmsg->fast_iov; | |
4071 | kmsg->msg.msg_iter.iov = kmsg->iov; | |
4072 | } else { | |
4073 | ret = io_sendmsg_copy_hdr(req, &iomsg); | |
4074 | if (ret) | |
4075 | return ret; | |
4076 | kmsg = &iomsg; | |
0fa03c62 | 4077 | } |
0fa03c62 | 4078 | |
7a7cacba PB |
4079 | flags = req->sr_msg.msg_flags; |
4080 | if (flags & MSG_DONTWAIT) | |
4081 | req->flags |= REQ_F_NOWAIT; | |
4082 | else if (force_nonblock) | |
4083 | flags |= MSG_DONTWAIT; | |
e47293fd | 4084 | |
7a7cacba PB |
4085 | ret = __sys_sendmsg_sock(sock, &kmsg->msg, flags); |
4086 | if (force_nonblock && ret == -EAGAIN) | |
4087 | return io_setup_async_msg(req, kmsg); | |
4088 | if (ret == -ERESTARTSYS) | |
4089 | ret = -EINTR; | |
0fa03c62 | 4090 | |
6b754c8b | 4091 | if (kmsg->iov != kmsg->fast_iov) |
0b416c3e | 4092 | kfree(kmsg->iov); |
99bc4c38 | 4093 | req->flags &= ~REQ_F_NEED_CLEANUP; |
4e88d6e7 JA |
4094 | if (ret < 0) |
4095 | req_set_fail_links(req); | |
229a7b63 | 4096 | __io_req_complete(req, ret, 0, cs); |
5d17b4a4 | 4097 | return 0; |
03b1230c | 4098 | } |
aa1fa28f | 4099 | |
229a7b63 JA |
4100 | static int io_send(struct io_kiocb *req, bool force_nonblock, |
4101 | struct io_comp_state *cs) | |
fddaface | 4102 | { |
7a7cacba PB |
4103 | struct io_sr_msg *sr = &req->sr_msg; |
4104 | struct msghdr msg; | |
4105 | struct iovec iov; | |
fddaface | 4106 | struct socket *sock; |
7a7cacba | 4107 | unsigned flags; |
fddaface JA |
4108 | int ret; |
4109 | ||
fddaface | 4110 | sock = sock_from_file(req->file, &ret); |
7a7cacba PB |
4111 | if (unlikely(!sock)) |
4112 | return ret; | |
fddaface | 4113 | |
7a7cacba PB |
4114 | ret = import_single_range(WRITE, sr->buf, sr->len, &iov, &msg.msg_iter); |
4115 | if (unlikely(ret)) | |
14c32eee | 4116 | return ret;; |
fddaface | 4117 | |
7a7cacba PB |
4118 | msg.msg_name = NULL; |
4119 | msg.msg_control = NULL; | |
4120 | msg.msg_controllen = 0; | |
4121 | msg.msg_namelen = 0; | |
fddaface | 4122 | |
7a7cacba PB |
4123 | flags = req->sr_msg.msg_flags; |
4124 | if (flags & MSG_DONTWAIT) | |
4125 | req->flags |= REQ_F_NOWAIT; | |
4126 | else if (force_nonblock) | |
4127 | flags |= MSG_DONTWAIT; | |
fddaface | 4128 | |
7a7cacba PB |
4129 | msg.msg_flags = flags; |
4130 | ret = sock_sendmsg(sock, &msg); | |
4131 | if (force_nonblock && ret == -EAGAIN) | |
4132 | return -EAGAIN; | |
4133 | if (ret == -ERESTARTSYS) | |
4134 | ret = -EINTR; | |
fddaface | 4135 | |
fddaface JA |
4136 | if (ret < 0) |
4137 | req_set_fail_links(req); | |
229a7b63 | 4138 | __io_req_complete(req, ret, 0, cs); |
fddaface | 4139 | return 0; |
fddaface JA |
4140 | } |
4141 | ||
1400e697 PB |
4142 | static int __io_recvmsg_copy_hdr(struct io_kiocb *req, |
4143 | struct io_async_msghdr *iomsg) | |
52de1fe1 JA |
4144 | { |
4145 | struct io_sr_msg *sr = &req->sr_msg; | |
4146 | struct iovec __user *uiov; | |
4147 | size_t iov_len; | |
4148 | int ret; | |
4149 | ||
1400e697 PB |
4150 | ret = __copy_msghdr_from_user(&iomsg->msg, sr->umsg, |
4151 | &iomsg->uaddr, &uiov, &iov_len); | |
52de1fe1 JA |
4152 | if (ret) |
4153 | return ret; | |
4154 | ||
4155 | if (req->flags & REQ_F_BUFFER_SELECT) { | |
4156 | if (iov_len > 1) | |
4157 | return -EINVAL; | |
1400e697 | 4158 | if (copy_from_user(iomsg->iov, uiov, sizeof(*uiov))) |
52de1fe1 | 4159 | return -EFAULT; |
1400e697 PB |
4160 | sr->len = iomsg->iov[0].iov_len; |
4161 | iov_iter_init(&iomsg->msg.msg_iter, READ, iomsg->iov, 1, | |
52de1fe1 | 4162 | sr->len); |
1400e697 | 4163 | iomsg->iov = NULL; |
52de1fe1 JA |
4164 | } else { |
4165 | ret = import_iovec(READ, uiov, iov_len, UIO_FASTIOV, | |
1400e697 | 4166 | &iomsg->iov, &iomsg->msg.msg_iter); |
52de1fe1 JA |
4167 | if (ret > 0) |
4168 | ret = 0; | |
4169 | } | |
4170 | ||
4171 | return ret; | |
4172 | } | |
4173 | ||
4174 | #ifdef CONFIG_COMPAT | |
4175 | static int __io_compat_recvmsg_copy_hdr(struct io_kiocb *req, | |
1400e697 | 4176 | struct io_async_msghdr *iomsg) |
52de1fe1 JA |
4177 | { |
4178 | struct compat_msghdr __user *msg_compat; | |
4179 | struct io_sr_msg *sr = &req->sr_msg; | |
4180 | struct compat_iovec __user *uiov; | |
4181 | compat_uptr_t ptr; | |
4182 | compat_size_t len; | |
4183 | int ret; | |
4184 | ||
270a5940 | 4185 | msg_compat = (struct compat_msghdr __user *) sr->umsg; |
1400e697 | 4186 | ret = __get_compat_msghdr(&iomsg->msg, msg_compat, &iomsg->uaddr, |
52de1fe1 JA |
4187 | &ptr, &len); |
4188 | if (ret) | |
4189 | return ret; | |
4190 | ||
4191 | uiov = compat_ptr(ptr); | |
4192 | if (req->flags & REQ_F_BUFFER_SELECT) { | |
4193 | compat_ssize_t clen; | |
4194 | ||
4195 | if (len > 1) | |
4196 | return -EINVAL; | |
4197 | if (!access_ok(uiov, sizeof(*uiov))) | |
4198 | return -EFAULT; | |
4199 | if (__get_user(clen, &uiov->iov_len)) | |
4200 | return -EFAULT; | |
4201 | if (clen < 0) | |
4202 | return -EINVAL; | |
1400e697 PB |
4203 | sr->len = iomsg->iov[0].iov_len; |
4204 | iomsg->iov = NULL; | |
52de1fe1 JA |
4205 | } else { |
4206 | ret = compat_import_iovec(READ, uiov, len, UIO_FASTIOV, | |
1400e697 PB |
4207 | &iomsg->iov, |
4208 | &iomsg->msg.msg_iter); | |
52de1fe1 JA |
4209 | if (ret < 0) |
4210 | return ret; | |
4211 | } | |
4212 | ||
4213 | return 0; | |
4214 | } | |
4215 | #endif | |
4216 | ||
1400e697 PB |
4217 | static int io_recvmsg_copy_hdr(struct io_kiocb *req, |
4218 | struct io_async_msghdr *iomsg) | |
52de1fe1 | 4219 | { |
1400e697 PB |
4220 | iomsg->msg.msg_name = &iomsg->addr; |
4221 | iomsg->iov = iomsg->fast_iov; | |
52de1fe1 JA |
4222 | |
4223 | #ifdef CONFIG_COMPAT | |
4224 | if (req->ctx->compat) | |
1400e697 | 4225 | return __io_compat_recvmsg_copy_hdr(req, iomsg); |
fddaface | 4226 | #endif |
52de1fe1 | 4227 | |
1400e697 | 4228 | return __io_recvmsg_copy_hdr(req, iomsg); |
52de1fe1 JA |
4229 | } |
4230 | ||
bcda7baa | 4231 | static struct io_buffer *io_recv_buffer_select(struct io_kiocb *req, |
7fbb1b54 | 4232 | bool needs_lock) |
bcda7baa JA |
4233 | { |
4234 | struct io_sr_msg *sr = &req->sr_msg; | |
4235 | struct io_buffer *kbuf; | |
4236 | ||
bcda7baa JA |
4237 | kbuf = io_buffer_select(req, &sr->len, sr->bgid, sr->kbuf, needs_lock); |
4238 | if (IS_ERR(kbuf)) | |
4239 | return kbuf; | |
4240 | ||
4241 | sr->kbuf = kbuf; | |
4242 | req->flags |= REQ_F_BUFFER_SELECTED; | |
bcda7baa | 4243 | return kbuf; |
fddaface JA |
4244 | } |
4245 | ||
7fbb1b54 PB |
4246 | static inline unsigned int io_put_recv_kbuf(struct io_kiocb *req) |
4247 | { | |
4248 | return io_put_kbuf(req, req->sr_msg.kbuf); | |
4249 | } | |
4250 | ||
3529d8c2 JA |
4251 | static int io_recvmsg_prep(struct io_kiocb *req, |
4252 | const struct io_uring_sqe *sqe) | |
aa1fa28f | 4253 | { |
e47293fd | 4254 | struct io_sr_msg *sr = &req->sr_msg; |
3529d8c2 | 4255 | struct io_async_ctx *io = req->io; |
99bc4c38 | 4256 | int ret; |
3529d8c2 | 4257 | |
d2b6f48b PB |
4258 | if (unlikely(req->ctx->flags & IORING_SETUP_IOPOLL)) |
4259 | return -EINVAL; | |
4260 | ||
3529d8c2 | 4261 | sr->msg_flags = READ_ONCE(sqe->msg_flags); |
270a5940 | 4262 | sr->umsg = u64_to_user_ptr(READ_ONCE(sqe->addr)); |
0b7b21e4 | 4263 | sr->len = READ_ONCE(sqe->len); |
bcda7baa | 4264 | sr->bgid = READ_ONCE(sqe->buf_group); |
06b76d44 | 4265 | |
d8768362 JA |
4266 | #ifdef CONFIG_COMPAT |
4267 | if (req->ctx->compat) | |
4268 | sr->msg_flags |= MSG_CMSG_COMPAT; | |
4269 | #endif | |
4270 | ||
fddaface | 4271 | if (!io || req->opcode == IORING_OP_RECV) |
06b76d44 | 4272 | return 0; |
5f798bea PB |
4273 | /* iovec is already imported */ |
4274 | if (req->flags & REQ_F_NEED_CLEANUP) | |
4275 | return 0; | |
03b1230c | 4276 | |
1400e697 | 4277 | ret = io_recvmsg_copy_hdr(req, &io->msg); |
99bc4c38 PB |
4278 | if (!ret) |
4279 | req->flags |= REQ_F_NEED_CLEANUP; | |
4280 | return ret; | |
aa1fa28f JA |
4281 | } |
4282 | ||
229a7b63 JA |
4283 | static int io_recvmsg(struct io_kiocb *req, bool force_nonblock, |
4284 | struct io_comp_state *cs) | |
aa1fa28f | 4285 | { |
6b754c8b | 4286 | struct io_async_msghdr iomsg, *kmsg; |
03b1230c | 4287 | struct socket *sock; |
7fbb1b54 | 4288 | struct io_buffer *kbuf; |
7a7cacba | 4289 | unsigned flags; |
52de1fe1 | 4290 | int ret, cflags = 0; |
03b1230c | 4291 | |
03b1230c | 4292 | sock = sock_from_file(req->file, &ret); |
7a7cacba PB |
4293 | if (unlikely(!sock)) |
4294 | return ret; | |
3529d8c2 | 4295 | |
7a7cacba PB |
4296 | if (req->io) { |
4297 | kmsg = &req->io->msg; | |
4298 | kmsg->msg.msg_name = &req->io->msg.addr; | |
4299 | /* if iov is set, it's allocated already */ | |
4300 | if (!kmsg->iov) | |
4301 | kmsg->iov = kmsg->fast_iov; | |
4302 | kmsg->msg.msg_iter.iov = kmsg->iov; | |
4303 | } else { | |
4304 | ret = io_recvmsg_copy_hdr(req, &iomsg); | |
4305 | if (ret) | |
681fda8d | 4306 | return ret; |
7a7cacba PB |
4307 | kmsg = &iomsg; |
4308 | } | |
03b1230c | 4309 | |
bc02ef33 | 4310 | if (req->flags & REQ_F_BUFFER_SELECT) { |
7fbb1b54 | 4311 | kbuf = io_recv_buffer_select(req, !force_nonblock); |
bc02ef33 | 4312 | if (IS_ERR(kbuf)) |
52de1fe1 | 4313 | return PTR_ERR(kbuf); |
7a7cacba PB |
4314 | kmsg->fast_iov[0].iov_base = u64_to_user_ptr(kbuf->addr); |
4315 | iov_iter_init(&kmsg->msg.msg_iter, READ, kmsg->iov, | |
4316 | 1, req->sr_msg.len); | |
4317 | } | |
52de1fe1 | 4318 | |
7a7cacba PB |
4319 | flags = req->sr_msg.msg_flags; |
4320 | if (flags & MSG_DONTWAIT) | |
4321 | req->flags |= REQ_F_NOWAIT; | |
4322 | else if (force_nonblock) | |
4323 | flags |= MSG_DONTWAIT; | |
e47293fd | 4324 | |
7a7cacba PB |
4325 | ret = __sys_recvmsg_sock(sock, &kmsg->msg, req->sr_msg.umsg, |
4326 | kmsg->uaddr, flags); | |
0e1b6fe3 PB |
4327 | if (force_nonblock && ret == -EAGAIN) |
4328 | return io_setup_async_msg(req, kmsg); | |
7a7cacba PB |
4329 | if (ret == -ERESTARTSYS) |
4330 | ret = -EINTR; | |
03b1230c | 4331 | |
7fbb1b54 PB |
4332 | if (req->flags & REQ_F_BUFFER_SELECTED) |
4333 | cflags = io_put_recv_kbuf(req); | |
6b754c8b | 4334 | if (kmsg->iov != kmsg->fast_iov) |
0b416c3e | 4335 | kfree(kmsg->iov); |
99bc4c38 | 4336 | req->flags &= ~REQ_F_NEED_CLEANUP; |
4e88d6e7 JA |
4337 | if (ret < 0) |
4338 | req_set_fail_links(req); | |
229a7b63 | 4339 | __io_req_complete(req, ret, cflags, cs); |
03b1230c | 4340 | return 0; |
0fa03c62 | 4341 | } |
5d17b4a4 | 4342 | |
229a7b63 JA |
4343 | static int io_recv(struct io_kiocb *req, bool force_nonblock, |
4344 | struct io_comp_state *cs) | |
fddaface | 4345 | { |
6b754c8b | 4346 | struct io_buffer *kbuf; |
7a7cacba PB |
4347 | struct io_sr_msg *sr = &req->sr_msg; |
4348 | struct msghdr msg; | |
4349 | void __user *buf = sr->buf; | |
fddaface | 4350 | struct socket *sock; |
7a7cacba PB |
4351 | struct iovec iov; |
4352 | unsigned flags; | |
bcda7baa | 4353 | int ret, cflags = 0; |
fddaface | 4354 | |
fddaface | 4355 | sock = sock_from_file(req->file, &ret); |
7a7cacba PB |
4356 | if (unlikely(!sock)) |
4357 | return ret; | |
fddaface | 4358 | |
bc02ef33 | 4359 | if (req->flags & REQ_F_BUFFER_SELECT) { |
7fbb1b54 | 4360 | kbuf = io_recv_buffer_select(req, !force_nonblock); |
bcda7baa JA |
4361 | if (IS_ERR(kbuf)) |
4362 | return PTR_ERR(kbuf); | |
7a7cacba | 4363 | buf = u64_to_user_ptr(kbuf->addr); |
bc02ef33 | 4364 | } |
bcda7baa | 4365 | |
7a7cacba | 4366 | ret = import_single_range(READ, buf, sr->len, &iov, &msg.msg_iter); |
14c32eee PB |
4367 | if (unlikely(ret)) |
4368 | goto out_free; | |
fddaface | 4369 | |
7a7cacba PB |
4370 | msg.msg_name = NULL; |
4371 | msg.msg_control = NULL; | |
4372 | msg.msg_controllen = 0; | |
4373 | msg.msg_namelen = 0; | |
4374 | msg.msg_iocb = NULL; | |
4375 | msg.msg_flags = 0; | |
fddaface | 4376 | |
7a7cacba PB |
4377 | flags = req->sr_msg.msg_flags; |
4378 | if (flags & MSG_DONTWAIT) | |
4379 | req->flags |= REQ_F_NOWAIT; | |
4380 | else if (force_nonblock) | |
4381 | flags |= MSG_DONTWAIT; | |
4382 | ||
4383 | ret = sock_recvmsg(sock, &msg, flags); | |
4384 | if (force_nonblock && ret == -EAGAIN) | |
4385 | return -EAGAIN; | |
4386 | if (ret == -ERESTARTSYS) | |
4387 | ret = -EINTR; | |
14c32eee | 4388 | out_free: |
7fbb1b54 PB |
4389 | if (req->flags & REQ_F_BUFFER_SELECTED) |
4390 | cflags = io_put_recv_kbuf(req); | |
fddaface JA |
4391 | if (ret < 0) |
4392 | req_set_fail_links(req); | |
229a7b63 | 4393 | __io_req_complete(req, ret, cflags, cs); |
fddaface | 4394 | return 0; |
fddaface JA |
4395 | } |
4396 | ||
3529d8c2 | 4397 | static int io_accept_prep(struct io_kiocb *req, const struct io_uring_sqe *sqe) |
17f2fe35 | 4398 | { |
8ed8d3c3 JA |
4399 | struct io_accept *accept = &req->accept; |
4400 | ||
17f2fe35 JA |
4401 | if (unlikely(req->ctx->flags & (IORING_SETUP_IOPOLL|IORING_SETUP_SQPOLL))) |
4402 | return -EINVAL; | |
8042d6ce | 4403 | if (sqe->ioprio || sqe->len || sqe->buf_index) |
17f2fe35 JA |
4404 | return -EINVAL; |
4405 | ||
d55e5f5b JA |
4406 | accept->addr = u64_to_user_ptr(READ_ONCE(sqe->addr)); |
4407 | accept->addr_len = u64_to_user_ptr(READ_ONCE(sqe->addr2)); | |
8ed8d3c3 | 4408 | accept->flags = READ_ONCE(sqe->accept_flags); |
09952e3e | 4409 | accept->nofile = rlimit(RLIMIT_NOFILE); |
8ed8d3c3 | 4410 | return 0; |
8ed8d3c3 | 4411 | } |
17f2fe35 | 4412 | |
229a7b63 JA |
4413 | static int io_accept(struct io_kiocb *req, bool force_nonblock, |
4414 | struct io_comp_state *cs) | |
8ed8d3c3 JA |
4415 | { |
4416 | struct io_accept *accept = &req->accept; | |
ac45abc0 | 4417 | unsigned int file_flags = force_nonblock ? O_NONBLOCK : 0; |
8ed8d3c3 JA |
4418 | int ret; |
4419 | ||
e697deed JX |
4420 | if (req->file->f_flags & O_NONBLOCK) |
4421 | req->flags |= REQ_F_NOWAIT; | |
4422 | ||
8ed8d3c3 | 4423 | ret = __sys_accept4_file(req->file, file_flags, accept->addr, |
09952e3e JA |
4424 | accept->addr_len, accept->flags, |
4425 | accept->nofile); | |
8ed8d3c3 | 4426 | if (ret == -EAGAIN && force_nonblock) |
17f2fe35 | 4427 | return -EAGAIN; |
ac45abc0 PB |
4428 | if (ret < 0) { |
4429 | if (ret == -ERESTARTSYS) | |
4430 | ret = -EINTR; | |
4e88d6e7 | 4431 | req_set_fail_links(req); |
ac45abc0 | 4432 | } |
229a7b63 | 4433 | __io_req_complete(req, ret, 0, cs); |
17f2fe35 | 4434 | return 0; |
8ed8d3c3 JA |
4435 | } |
4436 | ||
3529d8c2 | 4437 | static int io_connect_prep(struct io_kiocb *req, const struct io_uring_sqe *sqe) |
f499a021 | 4438 | { |
3529d8c2 JA |
4439 | struct io_connect *conn = &req->connect; |
4440 | struct io_async_ctx *io = req->io; | |
f499a021 | 4441 | |
3fbb51c1 JA |
4442 | if (unlikely(req->ctx->flags & (IORING_SETUP_IOPOLL|IORING_SETUP_SQPOLL))) |
4443 | return -EINVAL; | |
4444 | if (sqe->ioprio || sqe->len || sqe->buf_index || sqe->rw_flags) | |
4445 | return -EINVAL; | |
4446 | ||
3529d8c2 JA |
4447 | conn->addr = u64_to_user_ptr(READ_ONCE(sqe->addr)); |
4448 | conn->addr_len = READ_ONCE(sqe->addr2); | |
4449 | ||
4450 | if (!io) | |
4451 | return 0; | |
4452 | ||
4453 | return move_addr_to_kernel(conn->addr, conn->addr_len, | |
3fbb51c1 | 4454 | &io->connect.address); |
f499a021 JA |
4455 | } |
4456 | ||
229a7b63 JA |
4457 | static int io_connect(struct io_kiocb *req, bool force_nonblock, |
4458 | struct io_comp_state *cs) | |
f8e85cf2 | 4459 | { |
f499a021 | 4460 | struct io_async_ctx __io, *io; |
f8e85cf2 | 4461 | unsigned file_flags; |
3fbb51c1 | 4462 | int ret; |
f8e85cf2 | 4463 | |
f499a021 JA |
4464 | if (req->io) { |
4465 | io = req->io; | |
4466 | } else { | |
3529d8c2 JA |
4467 | ret = move_addr_to_kernel(req->connect.addr, |
4468 | req->connect.addr_len, | |
4469 | &__io.connect.address); | |
f499a021 JA |
4470 | if (ret) |
4471 | goto out; | |
4472 | io = &__io; | |
4473 | } | |
4474 | ||
3fbb51c1 JA |
4475 | file_flags = force_nonblock ? O_NONBLOCK : 0; |
4476 | ||
4477 | ret = __sys_connect_file(req->file, &io->connect.address, | |
4478 | req->connect.addr_len, file_flags); | |
87f80d62 | 4479 | if ((ret == -EAGAIN || ret == -EINPROGRESS) && force_nonblock) { |
b7bb4f7d JA |
4480 | if (req->io) |
4481 | return -EAGAIN; | |
4482 | if (io_alloc_async_ctx(req)) { | |
f499a021 JA |
4483 | ret = -ENOMEM; |
4484 | goto out; | |
4485 | } | |
b7bb4f7d | 4486 | memcpy(&req->io->connect, &__io.connect, sizeof(__io.connect)); |
f8e85cf2 | 4487 | return -EAGAIN; |
f499a021 | 4488 | } |
f8e85cf2 JA |
4489 | if (ret == -ERESTARTSYS) |
4490 | ret = -EINTR; | |
f499a021 | 4491 | out: |
4e88d6e7 JA |
4492 | if (ret < 0) |
4493 | req_set_fail_links(req); | |
229a7b63 | 4494 | __io_req_complete(req, ret, 0, cs); |
f8e85cf2 | 4495 | return 0; |
469956e8 Y |
4496 | } |
4497 | #else /* !CONFIG_NET */ | |
4498 | static int io_sendmsg_prep(struct io_kiocb *req, const struct io_uring_sqe *sqe) | |
4499 | { | |
f8e85cf2 | 4500 | return -EOPNOTSUPP; |
f8e85cf2 JA |
4501 | } |
4502 | ||
1e16c2f9 RD |
4503 | static int io_sendmsg(struct io_kiocb *req, bool force_nonblock, |
4504 | struct io_comp_state *cs) | |
469956e8 Y |
4505 | { |
4506 | return -EOPNOTSUPP; | |
4507 | } | |
4508 | ||
1e16c2f9 RD |
4509 | static int io_send(struct io_kiocb *req, bool force_nonblock, |
4510 | struct io_comp_state *cs) | |
469956e8 Y |
4511 | { |
4512 | return -EOPNOTSUPP; | |
4513 | } | |
4514 | ||
4515 | static int io_recvmsg_prep(struct io_kiocb *req, | |
4516 | const struct io_uring_sqe *sqe) | |
4517 | { | |
4518 | return -EOPNOTSUPP; | |
4519 | } | |
4520 | ||
1e16c2f9 RD |
4521 | static int io_recvmsg(struct io_kiocb *req, bool force_nonblock, |
4522 | struct io_comp_state *cs) | |
469956e8 Y |
4523 | { |
4524 | return -EOPNOTSUPP; | |
4525 | } | |
4526 | ||
1e16c2f9 RD |
4527 | static int io_recv(struct io_kiocb *req, bool force_nonblock, |
4528 | struct io_comp_state *cs) | |
469956e8 Y |
4529 | { |
4530 | return -EOPNOTSUPP; | |
4531 | } | |
4532 | ||
4533 | static int io_accept_prep(struct io_kiocb *req, const struct io_uring_sqe *sqe) | |
4534 | { | |
4535 | return -EOPNOTSUPP; | |
4536 | } | |
4537 | ||
1e16c2f9 RD |
4538 | static int io_accept(struct io_kiocb *req, bool force_nonblock, |
4539 | struct io_comp_state *cs) | |
469956e8 Y |
4540 | { |
4541 | return -EOPNOTSUPP; | |
4542 | } | |
ce593a6c | 4543 | |
469956e8 Y |
4544 | static int io_connect_prep(struct io_kiocb *req, const struct io_uring_sqe *sqe) |
4545 | { | |
4546 | return -EOPNOTSUPP; | |
4547 | } | |
4548 | ||
1e16c2f9 RD |
4549 | static int io_connect(struct io_kiocb *req, bool force_nonblock, |
4550 | struct io_comp_state *cs) | |
469956e8 | 4551 | { |
f8e85cf2 | 4552 | return -EOPNOTSUPP; |
ce593a6c | 4553 | } |
469956e8 | 4554 | #endif /* CONFIG_NET */ |
f8e85cf2 | 4555 | |
d7718a9d JA |
4556 | struct io_poll_table { |
4557 | struct poll_table_struct pt; | |
4558 | struct io_kiocb *req; | |
4559 | int error; | |
4560 | }; | |
ce593a6c | 4561 | |
d7718a9d JA |
4562 | static int __io_async_wake(struct io_kiocb *req, struct io_poll_iocb *poll, |
4563 | __poll_t mask, task_work_func_t func) | |
4564 | { | |
aa96bf8a | 4565 | int ret; |
d7718a9d JA |
4566 | |
4567 | /* for instances that support it check for an event match first: */ | |
4568 | if (mask && !(mask & poll->events)) | |
4569 | return 0; | |
4570 | ||
4571 | trace_io_uring_task_add(req->ctx, req->opcode, req->user_data, mask); | |
4572 | ||
4573 | list_del_init(&poll->wait.entry); | |
4574 | ||
d7718a9d JA |
4575 | req->result = mask; |
4576 | init_task_work(&req->task_work, func); | |
6d816e08 JA |
4577 | percpu_ref_get(&req->ctx->refs); |
4578 | ||
d7718a9d | 4579 | /* |
e3aabf95 JA |
4580 | * If this fails, then the task is exiting. When a task exits, the |
4581 | * work gets canceled, so just cancel this request as well instead | |
4582 | * of executing it. We can't safely execute it anyway, as we may not | |
4583 | * have the needed state needed for it anyway. | |
d7718a9d | 4584 | */ |
b7db41c9 | 4585 | ret = io_req_task_work_add(req, &req->task_work); |
aa96bf8a | 4586 | if (unlikely(ret)) { |
c2c4c83c JA |
4587 | struct task_struct *tsk; |
4588 | ||
e3aabf95 | 4589 | WRITE_ONCE(poll->canceled, true); |
aa96bf8a | 4590 | tsk = io_wq_get_task(req->ctx->io_wq); |
ce593a6c JA |
4591 | task_work_add(tsk, &req->task_work, 0); |
4592 | wake_up_process(tsk); | |
aa96bf8a | 4593 | } |
d7718a9d JA |
4594 | return 1; |
4595 | } | |
4596 | ||
74ce6ce4 JA |
4597 | static bool io_poll_rewait(struct io_kiocb *req, struct io_poll_iocb *poll) |
4598 | __acquires(&req->ctx->completion_lock) | |
4599 | { | |
4600 | struct io_ring_ctx *ctx = req->ctx; | |
4601 | ||
4602 | if (!req->result && !READ_ONCE(poll->canceled)) { | |
4603 | struct poll_table_struct pt = { ._key = poll->events }; | |
4604 | ||
4605 | req->result = vfs_poll(req->file, &pt) & poll->events; | |
4606 | } | |
4607 | ||
4608 | spin_lock_irq(&ctx->completion_lock); | |
4609 | if (!req->result && !READ_ONCE(poll->canceled)) { | |
4610 | add_wait_queue(poll->head, &poll->wait); | |
4611 | return true; | |
4612 | } | |
4613 | ||
4614 | return false; | |
4615 | } | |
4616 | ||
807abcb0 | 4617 | static void io_poll_remove_double(struct io_kiocb *req, void *data) |
18bceab1 | 4618 | { |
807abcb0 | 4619 | struct io_poll_iocb *poll = data; |
18bceab1 JA |
4620 | |
4621 | lockdep_assert_held(&req->ctx->completion_lock); | |
4622 | ||
4623 | if (poll && poll->head) { | |
4624 | struct wait_queue_head *head = poll->head; | |
4625 | ||
4626 | spin_lock(&head->lock); | |
4627 | list_del_init(&poll->wait.entry); | |
4628 | if (poll->wait.private) | |
4629 | refcount_dec(&req->refs); | |
4630 | poll->head = NULL; | |
4631 | spin_unlock(&head->lock); | |
4632 | } | |
4633 | } | |
4634 | ||
4635 | static void io_poll_complete(struct io_kiocb *req, __poll_t mask, int error) | |
4636 | { | |
4637 | struct io_ring_ctx *ctx = req->ctx; | |
4638 | ||
807abcb0 | 4639 | io_poll_remove_double(req, req->io); |
18bceab1 JA |
4640 | req->poll.done = true; |
4641 | io_cqring_fill_event(req, error ? error : mangle_poll(mask)); | |
4642 | io_commit_cqring(ctx); | |
4643 | } | |
4644 | ||
4645 | static void io_poll_task_handler(struct io_kiocb *req, struct io_kiocb **nxt) | |
4646 | { | |
4647 | struct io_ring_ctx *ctx = req->ctx; | |
4648 | ||
4649 | if (io_poll_rewait(req, &req->poll)) { | |
4650 | spin_unlock_irq(&ctx->completion_lock); | |
4651 | return; | |
4652 | } | |
4653 | ||
4654 | hash_del(&req->hash_node); | |
4655 | io_poll_complete(req, req->result, 0); | |
4656 | req->flags |= REQ_F_COMP_LOCKED; | |
9b5f7bd9 | 4657 | *nxt = io_put_req_find_next(req); |
18bceab1 JA |
4658 | spin_unlock_irq(&ctx->completion_lock); |
4659 | ||
4660 | io_cqring_ev_posted(ctx); | |
4661 | } | |
4662 | ||
4663 | static void io_poll_task_func(struct callback_head *cb) | |
4664 | { | |
4665 | struct io_kiocb *req = container_of(cb, struct io_kiocb, task_work); | |
6d816e08 | 4666 | struct io_ring_ctx *ctx = req->ctx; |
18bceab1 JA |
4667 | struct io_kiocb *nxt = NULL; |
4668 | ||
4669 | io_poll_task_handler(req, &nxt); | |
ea1164e5 PB |
4670 | if (nxt) |
4671 | __io_req_task_submit(nxt); | |
6d816e08 | 4672 | percpu_ref_put(&ctx->refs); |
18bceab1 JA |
4673 | } |
4674 | ||
4675 | static int io_poll_double_wake(struct wait_queue_entry *wait, unsigned mode, | |
4676 | int sync, void *key) | |
4677 | { | |
4678 | struct io_kiocb *req = wait->private; | |
807abcb0 | 4679 | struct io_poll_iocb *poll = req->apoll->double_poll; |
18bceab1 JA |
4680 | __poll_t mask = key_to_poll(key); |
4681 | ||
4682 | /* for instances that support it check for an event match first: */ | |
4683 | if (mask && !(mask & poll->events)) | |
4684 | return 0; | |
4685 | ||
807abcb0 | 4686 | if (poll && poll->head) { |
18bceab1 JA |
4687 | bool done; |
4688 | ||
807abcb0 JA |
4689 | spin_lock(&poll->head->lock); |
4690 | done = list_empty(&poll->wait.entry); | |
18bceab1 | 4691 | if (!done) |
807abcb0 JA |
4692 | list_del_init(&poll->wait.entry); |
4693 | spin_unlock(&poll->head->lock); | |
18bceab1 JA |
4694 | if (!done) |
4695 | __io_async_wake(req, poll, mask, io_poll_task_func); | |
4696 | } | |
4697 | refcount_dec(&req->refs); | |
4698 | return 1; | |
4699 | } | |
4700 | ||
4701 | static void io_init_poll_iocb(struct io_poll_iocb *poll, __poll_t events, | |
4702 | wait_queue_func_t wake_func) | |
4703 | { | |
4704 | poll->head = NULL; | |
4705 | poll->done = false; | |
4706 | poll->canceled = false; | |
4707 | poll->events = events; | |
4708 | INIT_LIST_HEAD(&poll->wait.entry); | |
4709 | init_waitqueue_func_entry(&poll->wait, wake_func); | |
4710 | } | |
4711 | ||
4712 | static void __io_queue_proc(struct io_poll_iocb *poll, struct io_poll_table *pt, | |
807abcb0 JA |
4713 | struct wait_queue_head *head, |
4714 | struct io_poll_iocb **poll_ptr) | |
18bceab1 JA |
4715 | { |
4716 | struct io_kiocb *req = pt->req; | |
4717 | ||
4718 | /* | |
4719 | * If poll->head is already set, it's because the file being polled | |
4720 | * uses multiple waitqueues for poll handling (eg one for read, one | |
4721 | * for write). Setup a separate io_poll_iocb if this happens. | |
4722 | */ | |
4723 | if (unlikely(poll->head)) { | |
4724 | /* already have a 2nd entry, fail a third attempt */ | |
807abcb0 | 4725 | if (*poll_ptr) { |
18bceab1 JA |
4726 | pt->error = -EINVAL; |
4727 | return; | |
4728 | } | |
4729 | poll = kmalloc(sizeof(*poll), GFP_ATOMIC); | |
4730 | if (!poll) { | |
4731 | pt->error = -ENOMEM; | |
4732 | return; | |
4733 | } | |
4734 | io_init_poll_iocb(poll, req->poll.events, io_poll_double_wake); | |
4735 | refcount_inc(&req->refs); | |
4736 | poll->wait.private = req; | |
807abcb0 | 4737 | *poll_ptr = poll; |
18bceab1 JA |
4738 | } |
4739 | ||
4740 | pt->error = 0; | |
4741 | poll->head = head; | |
a31eb4a2 JX |
4742 | |
4743 | if (poll->events & EPOLLEXCLUSIVE) | |
4744 | add_wait_queue_exclusive(head, &poll->wait); | |
4745 | else | |
4746 | add_wait_queue(head, &poll->wait); | |
18bceab1 JA |
4747 | } |
4748 | ||
4749 | static void io_async_queue_proc(struct file *file, struct wait_queue_head *head, | |
4750 | struct poll_table_struct *p) | |
4751 | { | |
4752 | struct io_poll_table *pt = container_of(p, struct io_poll_table, pt); | |
807abcb0 | 4753 | struct async_poll *apoll = pt->req->apoll; |
18bceab1 | 4754 | |
807abcb0 | 4755 | __io_queue_proc(&apoll->poll, pt, head, &apoll->double_poll); |
18bceab1 JA |
4756 | } |
4757 | ||
d7718a9d JA |
4758 | static void io_async_task_func(struct callback_head *cb) |
4759 | { | |
4760 | struct io_kiocb *req = container_of(cb, struct io_kiocb, task_work); | |
4761 | struct async_poll *apoll = req->apoll; | |
4762 | struct io_ring_ctx *ctx = req->ctx; | |
4763 | ||
4764 | trace_io_uring_task_run(req->ctx, req->opcode, req->user_data); | |
4765 | ||
74ce6ce4 | 4766 | if (io_poll_rewait(req, &apoll->poll)) { |
d7718a9d | 4767 | spin_unlock_irq(&ctx->completion_lock); |
6d816e08 | 4768 | percpu_ref_put(&ctx->refs); |
74ce6ce4 | 4769 | return; |
d7718a9d JA |
4770 | } |
4771 | ||
31067255 | 4772 | /* If req is still hashed, it cannot have been canceled. Don't check. */ |
0be0b0e3 | 4773 | if (hash_hashed(&req->hash_node)) |
74ce6ce4 | 4774 | hash_del(&req->hash_node); |
2bae047e | 4775 | |
807abcb0 | 4776 | io_poll_remove_double(req, apoll->double_poll); |
74ce6ce4 JA |
4777 | spin_unlock_irq(&ctx->completion_lock); |
4778 | ||
0be0b0e3 PB |
4779 | if (!READ_ONCE(apoll->poll.canceled)) |
4780 | __io_req_task_submit(req); | |
4781 | else | |
4782 | __io_req_task_cancel(req, -ECANCELED); | |
aa340845 | 4783 | |
6d816e08 | 4784 | percpu_ref_put(&ctx->refs); |
807abcb0 | 4785 | kfree(apoll->double_poll); |
31067255 | 4786 | kfree(apoll); |
d7718a9d JA |
4787 | } |
4788 | ||
4789 | static int io_async_wake(struct wait_queue_entry *wait, unsigned mode, int sync, | |
4790 | void *key) | |
4791 | { | |
4792 | struct io_kiocb *req = wait->private; | |
4793 | struct io_poll_iocb *poll = &req->apoll->poll; | |
4794 | ||
4795 | trace_io_uring_poll_wake(req->ctx, req->opcode, req->user_data, | |
4796 | key_to_poll(key)); | |
4797 | ||
4798 | return __io_async_wake(req, poll, key_to_poll(key), io_async_task_func); | |
4799 | } | |
4800 | ||
4801 | static void io_poll_req_insert(struct io_kiocb *req) | |
4802 | { | |
4803 | struct io_ring_ctx *ctx = req->ctx; | |
4804 | struct hlist_head *list; | |
4805 | ||
4806 | list = &ctx->cancel_hash[hash_long(req->user_data, ctx->cancel_hash_bits)]; | |
4807 | hlist_add_head(&req->hash_node, list); | |
4808 | } | |
4809 | ||
4810 | static __poll_t __io_arm_poll_handler(struct io_kiocb *req, | |
4811 | struct io_poll_iocb *poll, | |
4812 | struct io_poll_table *ipt, __poll_t mask, | |
4813 | wait_queue_func_t wake_func) | |
4814 | __acquires(&ctx->completion_lock) | |
4815 | { | |
4816 | struct io_ring_ctx *ctx = req->ctx; | |
4817 | bool cancel = false; | |
4818 | ||
18bceab1 | 4819 | io_init_poll_iocb(poll, mask, wake_func); |
b90cd197 | 4820 | poll->file = req->file; |
18bceab1 | 4821 | poll->wait.private = req; |
d7718a9d JA |
4822 | |
4823 | ipt->pt._key = mask; | |
4824 | ipt->req = req; | |
4825 | ipt->error = -EINVAL; | |
4826 | ||
d7718a9d JA |
4827 | mask = vfs_poll(req->file, &ipt->pt) & poll->events; |
4828 | ||
4829 | spin_lock_irq(&ctx->completion_lock); | |
4830 | if (likely(poll->head)) { | |
4831 | spin_lock(&poll->head->lock); | |
4832 | if (unlikely(list_empty(&poll->wait.entry))) { | |
4833 | if (ipt->error) | |
4834 | cancel = true; | |
4835 | ipt->error = 0; | |
4836 | mask = 0; | |
4837 | } | |
4838 | if (mask || ipt->error) | |
4839 | list_del_init(&poll->wait.entry); | |
4840 | else if (cancel) | |
4841 | WRITE_ONCE(poll->canceled, true); | |
4842 | else if (!poll->done) /* actually waiting for an event */ | |
4843 | io_poll_req_insert(req); | |
4844 | spin_unlock(&poll->head->lock); | |
4845 | } | |
4846 | ||
4847 | return mask; | |
4848 | } | |
4849 | ||
4850 | static bool io_arm_poll_handler(struct io_kiocb *req) | |
4851 | { | |
4852 | const struct io_op_def *def = &io_op_defs[req->opcode]; | |
4853 | struct io_ring_ctx *ctx = req->ctx; | |
4854 | struct async_poll *apoll; | |
4855 | struct io_poll_table ipt; | |
4856 | __poll_t mask, ret; | |
4857 | ||
4858 | if (!req->file || !file_can_poll(req->file)) | |
4859 | return false; | |
24c74678 | 4860 | if (req->flags & REQ_F_POLLED) |
d7718a9d JA |
4861 | return false; |
4862 | if (!def->pollin && !def->pollout) | |
4863 | return false; | |
4864 | ||
4865 | apoll = kmalloc(sizeof(*apoll), GFP_ATOMIC); | |
4866 | if (unlikely(!apoll)) | |
4867 | return false; | |
807abcb0 | 4868 | apoll->double_poll = NULL; |
d7718a9d JA |
4869 | |
4870 | req->flags |= REQ_F_POLLED; | |
4dd2824d | 4871 | io_get_req_task(req); |
d7718a9d JA |
4872 | req->apoll = apoll; |
4873 | INIT_HLIST_NODE(&req->hash_node); | |
4874 | ||
8755d97a | 4875 | mask = 0; |
d7718a9d | 4876 | if (def->pollin) |
8755d97a | 4877 | mask |= POLLIN | POLLRDNORM; |
d7718a9d JA |
4878 | if (def->pollout) |
4879 | mask |= POLLOUT | POLLWRNORM; | |
4880 | mask |= POLLERR | POLLPRI; | |
4881 | ||
4882 | ipt.pt._qproc = io_async_queue_proc; | |
4883 | ||
4884 | ret = __io_arm_poll_handler(req, &apoll->poll, &ipt, mask, | |
4885 | io_async_wake); | |
a36da65c | 4886 | if (ret || ipt.error) { |
807abcb0 | 4887 | io_poll_remove_double(req, apoll->double_poll); |
d7718a9d | 4888 | spin_unlock_irq(&ctx->completion_lock); |
807abcb0 | 4889 | kfree(apoll->double_poll); |
d7718a9d JA |
4890 | kfree(apoll); |
4891 | return false; | |
4892 | } | |
4893 | spin_unlock_irq(&ctx->completion_lock); | |
4894 | trace_io_uring_poll_arm(ctx, req->opcode, req->user_data, mask, | |
4895 | apoll->poll.events); | |
4896 | return true; | |
4897 | } | |
4898 | ||
4899 | static bool __io_poll_remove_one(struct io_kiocb *req, | |
4900 | struct io_poll_iocb *poll) | |
221c5eb2 | 4901 | { |
b41e9852 | 4902 | bool do_complete = false; |
221c5eb2 JA |
4903 | |
4904 | spin_lock(&poll->head->lock); | |
4905 | WRITE_ONCE(poll->canceled, true); | |
392edb45 JA |
4906 | if (!list_empty(&poll->wait.entry)) { |
4907 | list_del_init(&poll->wait.entry); | |
b41e9852 | 4908 | do_complete = true; |
221c5eb2 JA |
4909 | } |
4910 | spin_unlock(&poll->head->lock); | |
3bfa5bcb | 4911 | hash_del(&req->hash_node); |
d7718a9d JA |
4912 | return do_complete; |
4913 | } | |
4914 | ||
4915 | static bool io_poll_remove_one(struct io_kiocb *req) | |
4916 | { | |
4917 | bool do_complete; | |
4918 | ||
4919 | if (req->opcode == IORING_OP_POLL_ADD) { | |
807abcb0 | 4920 | io_poll_remove_double(req, req->io); |
d7718a9d JA |
4921 | do_complete = __io_poll_remove_one(req, &req->poll); |
4922 | } else { | |
3bfa5bcb JA |
4923 | struct async_poll *apoll = req->apoll; |
4924 | ||
807abcb0 JA |
4925 | io_poll_remove_double(req, apoll->double_poll); |
4926 | ||
d7718a9d | 4927 | /* non-poll requests have submit ref still */ |
3bfa5bcb JA |
4928 | do_complete = __io_poll_remove_one(req, &apoll->poll); |
4929 | if (do_complete) { | |
d7718a9d | 4930 | io_put_req(req); |
807abcb0 | 4931 | kfree(apoll->double_poll); |
3bfa5bcb JA |
4932 | kfree(apoll); |
4933 | } | |
b1f573bd XW |
4934 | } |
4935 | ||
b41e9852 JA |
4936 | if (do_complete) { |
4937 | io_cqring_fill_event(req, -ECANCELED); | |
4938 | io_commit_cqring(req->ctx); | |
4939 | req->flags |= REQ_F_COMP_LOCKED; | |
4940 | io_put_req(req); | |
4941 | } | |
4942 | ||
4943 | return do_complete; | |
221c5eb2 JA |
4944 | } |
4945 | ||
4946 | static void io_poll_remove_all(struct io_ring_ctx *ctx) | |
4947 | { | |
78076bb6 | 4948 | struct hlist_node *tmp; |
221c5eb2 | 4949 | struct io_kiocb *req; |
8e2e1faf | 4950 | int posted = 0, i; |
221c5eb2 JA |
4951 | |
4952 | spin_lock_irq(&ctx->completion_lock); | |
78076bb6 JA |
4953 | for (i = 0; i < (1U << ctx->cancel_hash_bits); i++) { |
4954 | struct hlist_head *list; | |
4955 | ||
4956 | list = &ctx->cancel_hash[i]; | |
4957 | hlist_for_each_entry_safe(req, tmp, list, hash_node) | |
8e2e1faf | 4958 | posted += io_poll_remove_one(req); |
221c5eb2 JA |
4959 | } |
4960 | spin_unlock_irq(&ctx->completion_lock); | |
b41e9852 | 4961 | |
8e2e1faf JA |
4962 | if (posted) |
4963 | io_cqring_ev_posted(ctx); | |
221c5eb2 JA |
4964 | } |
4965 | ||
47f46768 JA |
4966 | static int io_poll_cancel(struct io_ring_ctx *ctx, __u64 sqe_addr) |
4967 | { | |
78076bb6 | 4968 | struct hlist_head *list; |
47f46768 JA |
4969 | struct io_kiocb *req; |
4970 | ||
78076bb6 JA |
4971 | list = &ctx->cancel_hash[hash_long(sqe_addr, ctx->cancel_hash_bits)]; |
4972 | hlist_for_each_entry(req, list, hash_node) { | |
b41e9852 JA |
4973 | if (sqe_addr != req->user_data) |
4974 | continue; | |
4975 | if (io_poll_remove_one(req)) | |
eac406c6 | 4976 | return 0; |
b41e9852 | 4977 | return -EALREADY; |
47f46768 JA |
4978 | } |
4979 | ||
4980 | return -ENOENT; | |
4981 | } | |
4982 | ||
3529d8c2 JA |
4983 | static int io_poll_remove_prep(struct io_kiocb *req, |
4984 | const struct io_uring_sqe *sqe) | |
0969e783 | 4985 | { |
0969e783 JA |
4986 | if (unlikely(req->ctx->flags & IORING_SETUP_IOPOLL)) |
4987 | return -EINVAL; | |
4988 | if (sqe->ioprio || sqe->off || sqe->len || sqe->buf_index || | |
4989 | sqe->poll_events) | |
4990 | return -EINVAL; | |
4991 | ||
4992 | req->poll.addr = READ_ONCE(sqe->addr); | |
0969e783 JA |
4993 | return 0; |
4994 | } | |
4995 | ||
221c5eb2 JA |
4996 | /* |
4997 | * Find a running poll command that matches one specified in sqe->addr, | |
4998 | * and remove it if found. | |
4999 | */ | |
fc4df999 | 5000 | static int io_poll_remove(struct io_kiocb *req) |
221c5eb2 JA |
5001 | { |
5002 | struct io_ring_ctx *ctx = req->ctx; | |
0969e783 | 5003 | u64 addr; |
47f46768 | 5004 | int ret; |
221c5eb2 | 5005 | |
0969e783 | 5006 | addr = req->poll.addr; |
221c5eb2 | 5007 | spin_lock_irq(&ctx->completion_lock); |
0969e783 | 5008 | ret = io_poll_cancel(ctx, addr); |
221c5eb2 JA |
5009 | spin_unlock_irq(&ctx->completion_lock); |
5010 | ||
4e88d6e7 JA |
5011 | if (ret < 0) |
5012 | req_set_fail_links(req); | |
e1e16097 | 5013 | io_req_complete(req, ret); |
221c5eb2 JA |
5014 | return 0; |
5015 | } | |
5016 | ||
221c5eb2 JA |
5017 | static int io_poll_wake(struct wait_queue_entry *wait, unsigned mode, int sync, |
5018 | void *key) | |
5019 | { | |
c2f2eb7d JA |
5020 | struct io_kiocb *req = wait->private; |
5021 | struct io_poll_iocb *poll = &req->poll; | |
221c5eb2 | 5022 | |
d7718a9d | 5023 | return __io_async_wake(req, poll, key_to_poll(key), io_poll_task_func); |
221c5eb2 JA |
5024 | } |
5025 | ||
221c5eb2 JA |
5026 | static void io_poll_queue_proc(struct file *file, struct wait_queue_head *head, |
5027 | struct poll_table_struct *p) | |
5028 | { | |
5029 | struct io_poll_table *pt = container_of(p, struct io_poll_table, pt); | |
5030 | ||
807abcb0 | 5031 | __io_queue_proc(&pt->req->poll, pt, head, (struct io_poll_iocb **) &pt->req->io); |
eac406c6 JA |
5032 | } |
5033 | ||
3529d8c2 | 5034 | static int io_poll_add_prep(struct io_kiocb *req, const struct io_uring_sqe *sqe) |
221c5eb2 JA |
5035 | { |
5036 | struct io_poll_iocb *poll = &req->poll; | |
5769a351 | 5037 | u32 events; |
221c5eb2 JA |
5038 | |
5039 | if (unlikely(req->ctx->flags & IORING_SETUP_IOPOLL)) | |
5040 | return -EINVAL; | |
5041 | if (sqe->addr || sqe->ioprio || sqe->off || sqe->len || sqe->buf_index) | |
5042 | return -EINVAL; | |
09bb8394 JA |
5043 | if (!poll->file) |
5044 | return -EBADF; | |
221c5eb2 | 5045 | |
5769a351 JX |
5046 | events = READ_ONCE(sqe->poll32_events); |
5047 | #ifdef __BIG_ENDIAN | |
5048 | events = swahw32(events); | |
5049 | #endif | |
a31eb4a2 JX |
5050 | poll->events = demangle_poll(events) | EPOLLERR | EPOLLHUP | |
5051 | (events & EPOLLEXCLUSIVE); | |
b41e9852 | 5052 | |
4dd2824d | 5053 | io_get_req_task(req); |
0969e783 JA |
5054 | return 0; |
5055 | } | |
5056 | ||
014db007 | 5057 | static int io_poll_add(struct io_kiocb *req) |
0969e783 JA |
5058 | { |
5059 | struct io_poll_iocb *poll = &req->poll; | |
5060 | struct io_ring_ctx *ctx = req->ctx; | |
5061 | struct io_poll_table ipt; | |
0969e783 | 5062 | __poll_t mask; |
0969e783 | 5063 | |
78076bb6 | 5064 | INIT_HLIST_NODE(&req->hash_node); |
d7718a9d | 5065 | ipt.pt._qproc = io_poll_queue_proc; |
36703247 | 5066 | |
d7718a9d JA |
5067 | mask = __io_arm_poll_handler(req, &req->poll, &ipt, poll->events, |
5068 | io_poll_wake); | |
221c5eb2 | 5069 | |
8c838788 | 5070 | if (mask) { /* no async, we'd stolen it */ |
221c5eb2 | 5071 | ipt.error = 0; |
b0dd8a41 | 5072 | io_poll_complete(req, mask, 0); |
221c5eb2 | 5073 | } |
221c5eb2 JA |
5074 | spin_unlock_irq(&ctx->completion_lock); |
5075 | ||
8c838788 JA |
5076 | if (mask) { |
5077 | io_cqring_ev_posted(ctx); | |
014db007 | 5078 | io_put_req(req); |
221c5eb2 | 5079 | } |
8c838788 | 5080 | return ipt.error; |
221c5eb2 JA |
5081 | } |
5082 | ||
5262f567 JA |
5083 | static enum hrtimer_restart io_timeout_fn(struct hrtimer *timer) |
5084 | { | |
ad8a48ac JA |
5085 | struct io_timeout_data *data = container_of(timer, |
5086 | struct io_timeout_data, timer); | |
5087 | struct io_kiocb *req = data->req; | |
5088 | struct io_ring_ctx *ctx = req->ctx; | |
5262f567 JA |
5089 | unsigned long flags; |
5090 | ||
5262f567 | 5091 | spin_lock_irqsave(&ctx->completion_lock, flags); |
01cec8c1 PB |
5092 | atomic_set(&req->ctx->cq_timeouts, |
5093 | atomic_read(&req->ctx->cq_timeouts) + 1); | |
5094 | ||
ef03681a | 5095 | /* |
11365043 JA |
5096 | * We could be racing with timeout deletion. If the list is empty, |
5097 | * then timeout lookup already found it and will be handling it. | |
ef03681a | 5098 | */ |
135fcde8 PB |
5099 | if (!list_empty(&req->timeout.list)) |
5100 | list_del_init(&req->timeout.list); | |
5262f567 | 5101 | |
78e19bbe | 5102 | io_cqring_fill_event(req, -ETIME); |
5262f567 JA |
5103 | io_commit_cqring(ctx); |
5104 | spin_unlock_irqrestore(&ctx->completion_lock, flags); | |
5105 | ||
5106 | io_cqring_ev_posted(ctx); | |
4e88d6e7 | 5107 | req_set_fail_links(req); |
5262f567 JA |
5108 | io_put_req(req); |
5109 | return HRTIMER_NORESTART; | |
5110 | } | |
5111 | ||
47f46768 JA |
5112 | static int io_timeout_cancel(struct io_ring_ctx *ctx, __u64 user_data) |
5113 | { | |
5114 | struct io_kiocb *req; | |
5115 | int ret = -ENOENT; | |
5116 | ||
135fcde8 | 5117 | list_for_each_entry(req, &ctx->timeout_list, timeout.list) { |
47f46768 | 5118 | if (user_data == req->user_data) { |
135fcde8 | 5119 | list_del_init(&req->timeout.list); |
47f46768 JA |
5120 | ret = 0; |
5121 | break; | |
5122 | } | |
5123 | } | |
5124 | ||
5125 | if (ret == -ENOENT) | |
5126 | return ret; | |
5127 | ||
2d28390a | 5128 | ret = hrtimer_try_to_cancel(&req->io->timeout.timer); |
47f46768 JA |
5129 | if (ret == -1) |
5130 | return -EALREADY; | |
5131 | ||
4e88d6e7 | 5132 | req_set_fail_links(req); |
9b7adba9 | 5133 | req->flags |= REQ_F_COMP_LOCKED; |
47f46768 JA |
5134 | io_cqring_fill_event(req, -ECANCELED); |
5135 | io_put_req(req); | |
5136 | return 0; | |
5137 | } | |
5138 | ||
3529d8c2 JA |
5139 | static int io_timeout_remove_prep(struct io_kiocb *req, |
5140 | const struct io_uring_sqe *sqe) | |
b29472ee | 5141 | { |
b29472ee JA |
5142 | if (unlikely(req->ctx->flags & IORING_SETUP_IOPOLL)) |
5143 | return -EINVAL; | |
61710e43 DA |
5144 | if (unlikely(req->flags & (REQ_F_FIXED_FILE | REQ_F_BUFFER_SELECT))) |
5145 | return -EINVAL; | |
5146 | if (sqe->ioprio || sqe->buf_index || sqe->len) | |
b29472ee JA |
5147 | return -EINVAL; |
5148 | ||
5149 | req->timeout.addr = READ_ONCE(sqe->addr); | |
5150 | req->timeout.flags = READ_ONCE(sqe->timeout_flags); | |
5151 | if (req->timeout.flags) | |
5152 | return -EINVAL; | |
5153 | ||
b29472ee JA |
5154 | return 0; |
5155 | } | |
5156 | ||
11365043 JA |
5157 | /* |
5158 | * Remove or update an existing timeout command | |
5159 | */ | |
fc4df999 | 5160 | static int io_timeout_remove(struct io_kiocb *req) |
11365043 JA |
5161 | { |
5162 | struct io_ring_ctx *ctx = req->ctx; | |
47f46768 | 5163 | int ret; |
11365043 | 5164 | |
11365043 | 5165 | spin_lock_irq(&ctx->completion_lock); |
b29472ee | 5166 | ret = io_timeout_cancel(ctx, req->timeout.addr); |
11365043 | 5167 | |
47f46768 | 5168 | io_cqring_fill_event(req, ret); |
11365043 JA |
5169 | io_commit_cqring(ctx); |
5170 | spin_unlock_irq(&ctx->completion_lock); | |
5262f567 | 5171 | io_cqring_ev_posted(ctx); |
4e88d6e7 JA |
5172 | if (ret < 0) |
5173 | req_set_fail_links(req); | |
ec9c02ad | 5174 | io_put_req(req); |
11365043 | 5175 | return 0; |
5262f567 JA |
5176 | } |
5177 | ||
3529d8c2 | 5178 | static int io_timeout_prep(struct io_kiocb *req, const struct io_uring_sqe *sqe, |
2d28390a | 5179 | bool is_timeout_link) |
5262f567 | 5180 | { |
ad8a48ac | 5181 | struct io_timeout_data *data; |
a41525ab | 5182 | unsigned flags; |
56080b02 | 5183 | u32 off = READ_ONCE(sqe->off); |
5262f567 | 5184 | |
ad8a48ac | 5185 | if (unlikely(req->ctx->flags & IORING_SETUP_IOPOLL)) |
5262f567 | 5186 | return -EINVAL; |
ad8a48ac | 5187 | if (sqe->ioprio || sqe->buf_index || sqe->len != 1) |
a41525ab | 5188 | return -EINVAL; |
56080b02 | 5189 | if (off && is_timeout_link) |
2d28390a | 5190 | return -EINVAL; |
a41525ab JA |
5191 | flags = READ_ONCE(sqe->timeout_flags); |
5192 | if (flags & ~IORING_TIMEOUT_ABS) | |
5262f567 | 5193 | return -EINVAL; |
bdf20073 | 5194 | |
bfe68a22 | 5195 | req->timeout.off = off; |
26a61679 | 5196 | |
3529d8c2 | 5197 | if (!req->io && io_alloc_async_ctx(req)) |
26a61679 JA |
5198 | return -ENOMEM; |
5199 | ||
5200 | data = &req->io->timeout; | |
ad8a48ac | 5201 | data->req = req; |
ad8a48ac JA |
5202 | |
5203 | if (get_timespec64(&data->ts, u64_to_user_ptr(sqe->addr))) | |
5262f567 JA |
5204 | return -EFAULT; |
5205 | ||
11365043 | 5206 | if (flags & IORING_TIMEOUT_ABS) |
ad8a48ac | 5207 | data->mode = HRTIMER_MODE_ABS; |
11365043 | 5208 | else |
ad8a48ac | 5209 | data->mode = HRTIMER_MODE_REL; |
11365043 | 5210 | |
ad8a48ac JA |
5211 | hrtimer_init(&data->timer, CLOCK_MONOTONIC, data->mode); |
5212 | return 0; | |
5213 | } | |
5214 | ||
fc4df999 | 5215 | static int io_timeout(struct io_kiocb *req) |
ad8a48ac | 5216 | { |
ad8a48ac | 5217 | struct io_ring_ctx *ctx = req->ctx; |
bfe68a22 | 5218 | struct io_timeout_data *data = &req->io->timeout; |
ad8a48ac | 5219 | struct list_head *entry; |
bfe68a22 | 5220 | u32 tail, off = req->timeout.off; |
ad8a48ac | 5221 | |
733f5c95 | 5222 | spin_lock_irq(&ctx->completion_lock); |
93bd25bb | 5223 | |
5262f567 JA |
5224 | /* |
5225 | * sqe->off holds how many events that need to occur for this | |
93bd25bb JA |
5226 | * timeout event to be satisfied. If it isn't set, then this is |
5227 | * a pure timeout request, sequence isn't used. | |
5262f567 | 5228 | */ |
8eb7e2d0 | 5229 | if (io_is_timeout_noseq(req)) { |
93bd25bb JA |
5230 | entry = ctx->timeout_list.prev; |
5231 | goto add; | |
5232 | } | |
5262f567 | 5233 | |
bfe68a22 PB |
5234 | tail = ctx->cached_cq_tail - atomic_read(&ctx->cq_timeouts); |
5235 | req->timeout.target_seq = tail + off; | |
5262f567 JA |
5236 | |
5237 | /* | |
5238 | * Insertion sort, ensuring the first entry in the list is always | |
5239 | * the one we need first. | |
5240 | */ | |
5262f567 | 5241 | list_for_each_prev(entry, &ctx->timeout_list) { |
135fcde8 PB |
5242 | struct io_kiocb *nxt = list_entry(entry, struct io_kiocb, |
5243 | timeout.list); | |
5262f567 | 5244 | |
8eb7e2d0 | 5245 | if (io_is_timeout_noseq(nxt)) |
93bd25bb | 5246 | continue; |
bfe68a22 PB |
5247 | /* nxt.seq is behind @tail, otherwise would've been completed */ |
5248 | if (off >= nxt->timeout.target_seq - tail) | |
5262f567 JA |
5249 | break; |
5250 | } | |
93bd25bb | 5251 | add: |
135fcde8 | 5252 | list_add(&req->timeout.list, entry); |
ad8a48ac JA |
5253 | data->timer.function = io_timeout_fn; |
5254 | hrtimer_start(&data->timer, timespec64_to_ktime(data->ts), data->mode); | |
5262f567 | 5255 | spin_unlock_irq(&ctx->completion_lock); |
5262f567 JA |
5256 | return 0; |
5257 | } | |
5262f567 | 5258 | |
62755e35 JA |
5259 | static bool io_cancel_cb(struct io_wq_work *work, void *data) |
5260 | { | |
5261 | struct io_kiocb *req = container_of(work, struct io_kiocb, work); | |
5262 | ||
5263 | return req->user_data == (unsigned long) data; | |
5264 | } | |
5265 | ||
e977d6d3 | 5266 | static int io_async_cancel_one(struct io_ring_ctx *ctx, void *sqe_addr) |
62755e35 | 5267 | { |
62755e35 | 5268 | enum io_wq_cancel cancel_ret; |
62755e35 JA |
5269 | int ret = 0; |
5270 | ||
4f26bda1 | 5271 | cancel_ret = io_wq_cancel_cb(ctx->io_wq, io_cancel_cb, sqe_addr, false); |
62755e35 JA |
5272 | switch (cancel_ret) { |
5273 | case IO_WQ_CANCEL_OK: | |
5274 | ret = 0; | |
5275 | break; | |
5276 | case IO_WQ_CANCEL_RUNNING: | |
5277 | ret = -EALREADY; | |
5278 | break; | |
5279 | case IO_WQ_CANCEL_NOTFOUND: | |
5280 | ret = -ENOENT; | |
5281 | break; | |
5282 | } | |
5283 | ||
e977d6d3 JA |
5284 | return ret; |
5285 | } | |
5286 | ||
47f46768 JA |
5287 | static void io_async_find_and_cancel(struct io_ring_ctx *ctx, |
5288 | struct io_kiocb *req, __u64 sqe_addr, | |
014db007 | 5289 | int success_ret) |
47f46768 JA |
5290 | { |
5291 | unsigned long flags; | |
5292 | int ret; | |
5293 | ||
5294 | ret = io_async_cancel_one(ctx, (void *) (unsigned long) sqe_addr); | |
5295 | if (ret != -ENOENT) { | |
5296 | spin_lock_irqsave(&ctx->completion_lock, flags); | |
5297 | goto done; | |
5298 | } | |
5299 | ||
5300 | spin_lock_irqsave(&ctx->completion_lock, flags); | |
5301 | ret = io_timeout_cancel(ctx, sqe_addr); | |
5302 | if (ret != -ENOENT) | |
5303 | goto done; | |
5304 | ret = io_poll_cancel(ctx, sqe_addr); | |
5305 | done: | |
b0dd8a41 JA |
5306 | if (!ret) |
5307 | ret = success_ret; | |
47f46768 JA |
5308 | io_cqring_fill_event(req, ret); |
5309 | io_commit_cqring(ctx); | |
5310 | spin_unlock_irqrestore(&ctx->completion_lock, flags); | |
5311 | io_cqring_ev_posted(ctx); | |
5312 | ||
4e88d6e7 JA |
5313 | if (ret < 0) |
5314 | req_set_fail_links(req); | |
014db007 | 5315 | io_put_req(req); |
47f46768 JA |
5316 | } |
5317 | ||
3529d8c2 JA |
5318 | static int io_async_cancel_prep(struct io_kiocb *req, |
5319 | const struct io_uring_sqe *sqe) | |
e977d6d3 | 5320 | { |
fbf23849 | 5321 | if (unlikely(req->ctx->flags & IORING_SETUP_IOPOLL)) |
e977d6d3 | 5322 | return -EINVAL; |
61710e43 DA |
5323 | if (unlikely(req->flags & (REQ_F_FIXED_FILE | REQ_F_BUFFER_SELECT))) |
5324 | return -EINVAL; | |
5325 | if (sqe->ioprio || sqe->off || sqe->len || sqe->cancel_flags) | |
e977d6d3 JA |
5326 | return -EINVAL; |
5327 | ||
fbf23849 JA |
5328 | req->cancel.addr = READ_ONCE(sqe->addr); |
5329 | return 0; | |
5330 | } | |
5331 | ||
014db007 | 5332 | static int io_async_cancel(struct io_kiocb *req) |
fbf23849 JA |
5333 | { |
5334 | struct io_ring_ctx *ctx = req->ctx; | |
fbf23849 | 5335 | |
014db007 | 5336 | io_async_find_and_cancel(ctx, req, req->cancel.addr, 0); |
5262f567 JA |
5337 | return 0; |
5338 | } | |
5339 | ||
05f3fb3c JA |
5340 | static int io_files_update_prep(struct io_kiocb *req, |
5341 | const struct io_uring_sqe *sqe) | |
5342 | { | |
61710e43 DA |
5343 | if (unlikely(req->flags & (REQ_F_FIXED_FILE | REQ_F_BUFFER_SELECT))) |
5344 | return -EINVAL; | |
5345 | if (sqe->ioprio || sqe->rw_flags) | |
05f3fb3c JA |
5346 | return -EINVAL; |
5347 | ||
5348 | req->files_update.offset = READ_ONCE(sqe->off); | |
5349 | req->files_update.nr_args = READ_ONCE(sqe->len); | |
5350 | if (!req->files_update.nr_args) | |
5351 | return -EINVAL; | |
5352 | req->files_update.arg = READ_ONCE(sqe->addr); | |
5353 | return 0; | |
5354 | } | |
5355 | ||
229a7b63 JA |
5356 | static int io_files_update(struct io_kiocb *req, bool force_nonblock, |
5357 | struct io_comp_state *cs) | |
fbf23849 JA |
5358 | { |
5359 | struct io_ring_ctx *ctx = req->ctx; | |
05f3fb3c JA |
5360 | struct io_uring_files_update up; |
5361 | int ret; | |
fbf23849 | 5362 | |
f86cd20c | 5363 | if (force_nonblock) |
05f3fb3c | 5364 | return -EAGAIN; |
05f3fb3c JA |
5365 | |
5366 | up.offset = req->files_update.offset; | |
5367 | up.fds = req->files_update.arg; | |
5368 | ||
5369 | mutex_lock(&ctx->uring_lock); | |
5370 | ret = __io_sqe_files_update(ctx, &up, req->files_update.nr_args); | |
5371 | mutex_unlock(&ctx->uring_lock); | |
5372 | ||
5373 | if (ret < 0) | |
5374 | req_set_fail_links(req); | |
229a7b63 | 5375 | __io_req_complete(req, ret, 0, cs); |
5262f567 JA |
5376 | return 0; |
5377 | } | |
5378 | ||
3529d8c2 JA |
5379 | static int io_req_defer_prep(struct io_kiocb *req, |
5380 | const struct io_uring_sqe *sqe) | |
f67676d1 | 5381 | { |
e781573e | 5382 | ssize_t ret = 0; |
f67676d1 | 5383 | |
f1d96a8f PB |
5384 | if (!sqe) |
5385 | return 0; | |
5386 | ||
327d6d96 PB |
5387 | if (io_alloc_async_ctx(req)) |
5388 | return -EAGAIN; | |
f56040b8 PB |
5389 | ret = io_prep_work_files(req); |
5390 | if (unlikely(ret)) | |
5391 | return ret; | |
cccf0ee8 | 5392 | |
d625c6ee | 5393 | switch (req->opcode) { |
e781573e JA |
5394 | case IORING_OP_NOP: |
5395 | break; | |
f67676d1 JA |
5396 | case IORING_OP_READV: |
5397 | case IORING_OP_READ_FIXED: | |
3a6820f2 | 5398 | case IORING_OP_READ: |
3529d8c2 | 5399 | ret = io_read_prep(req, sqe, true); |
f67676d1 JA |
5400 | break; |
5401 | case IORING_OP_WRITEV: | |
5402 | case IORING_OP_WRITE_FIXED: | |
3a6820f2 | 5403 | case IORING_OP_WRITE: |
3529d8c2 | 5404 | ret = io_write_prep(req, sqe, true); |
f67676d1 | 5405 | break; |
0969e783 | 5406 | case IORING_OP_POLL_ADD: |
3529d8c2 | 5407 | ret = io_poll_add_prep(req, sqe); |
0969e783 JA |
5408 | break; |
5409 | case IORING_OP_POLL_REMOVE: | |
3529d8c2 | 5410 | ret = io_poll_remove_prep(req, sqe); |
0969e783 | 5411 | break; |
8ed8d3c3 | 5412 | case IORING_OP_FSYNC: |
3529d8c2 | 5413 | ret = io_prep_fsync(req, sqe); |
8ed8d3c3 JA |
5414 | break; |
5415 | case IORING_OP_SYNC_FILE_RANGE: | |
3529d8c2 | 5416 | ret = io_prep_sfr(req, sqe); |
8ed8d3c3 | 5417 | break; |
03b1230c | 5418 | case IORING_OP_SENDMSG: |
fddaface | 5419 | case IORING_OP_SEND: |
3529d8c2 | 5420 | ret = io_sendmsg_prep(req, sqe); |
03b1230c JA |
5421 | break; |
5422 | case IORING_OP_RECVMSG: | |
fddaface | 5423 | case IORING_OP_RECV: |
3529d8c2 | 5424 | ret = io_recvmsg_prep(req, sqe); |
03b1230c | 5425 | break; |
f499a021 | 5426 | case IORING_OP_CONNECT: |
3529d8c2 | 5427 | ret = io_connect_prep(req, sqe); |
f499a021 | 5428 | break; |
2d28390a | 5429 | case IORING_OP_TIMEOUT: |
3529d8c2 | 5430 | ret = io_timeout_prep(req, sqe, false); |
b7bb4f7d | 5431 | break; |
b29472ee | 5432 | case IORING_OP_TIMEOUT_REMOVE: |
3529d8c2 | 5433 | ret = io_timeout_remove_prep(req, sqe); |
b29472ee | 5434 | break; |
fbf23849 | 5435 | case IORING_OP_ASYNC_CANCEL: |
3529d8c2 | 5436 | ret = io_async_cancel_prep(req, sqe); |
fbf23849 | 5437 | break; |
2d28390a | 5438 | case IORING_OP_LINK_TIMEOUT: |
3529d8c2 | 5439 | ret = io_timeout_prep(req, sqe, true); |
b7bb4f7d | 5440 | break; |
8ed8d3c3 | 5441 | case IORING_OP_ACCEPT: |
3529d8c2 | 5442 | ret = io_accept_prep(req, sqe); |
8ed8d3c3 | 5443 | break; |
d63d1b5e JA |
5444 | case IORING_OP_FALLOCATE: |
5445 | ret = io_fallocate_prep(req, sqe); | |
5446 | break; | |
15b71abe JA |
5447 | case IORING_OP_OPENAT: |
5448 | ret = io_openat_prep(req, sqe); | |
5449 | break; | |
b5dba59e JA |
5450 | case IORING_OP_CLOSE: |
5451 | ret = io_close_prep(req, sqe); | |
5452 | break; | |
05f3fb3c JA |
5453 | case IORING_OP_FILES_UPDATE: |
5454 | ret = io_files_update_prep(req, sqe); | |
5455 | break; | |
eddc7ef5 JA |
5456 | case IORING_OP_STATX: |
5457 | ret = io_statx_prep(req, sqe); | |
5458 | break; | |
4840e418 JA |
5459 | case IORING_OP_FADVISE: |
5460 | ret = io_fadvise_prep(req, sqe); | |
5461 | break; | |
c1ca757b JA |
5462 | case IORING_OP_MADVISE: |
5463 | ret = io_madvise_prep(req, sqe); | |
5464 | break; | |
cebdb986 JA |
5465 | case IORING_OP_OPENAT2: |
5466 | ret = io_openat2_prep(req, sqe); | |
5467 | break; | |
3e4827b0 JA |
5468 | case IORING_OP_EPOLL_CTL: |
5469 | ret = io_epoll_ctl_prep(req, sqe); | |
5470 | break; | |
7d67af2c PB |
5471 | case IORING_OP_SPLICE: |
5472 | ret = io_splice_prep(req, sqe); | |
5473 | break; | |
ddf0322d JA |
5474 | case IORING_OP_PROVIDE_BUFFERS: |
5475 | ret = io_provide_buffers_prep(req, sqe); | |
5476 | break; | |
067524e9 JA |
5477 | case IORING_OP_REMOVE_BUFFERS: |
5478 | ret = io_remove_buffers_prep(req, sqe); | |
5479 | break; | |
f2a8d5c7 PB |
5480 | case IORING_OP_TEE: |
5481 | ret = io_tee_prep(req, sqe); | |
5482 | break; | |
f67676d1 | 5483 | default: |
e781573e JA |
5484 | printk_once(KERN_WARNING "io_uring: unhandled opcode %d\n", |
5485 | req->opcode); | |
5486 | ret = -EINVAL; | |
b7bb4f7d | 5487 | break; |
f67676d1 JA |
5488 | } |
5489 | ||
b7bb4f7d | 5490 | return ret; |
f67676d1 JA |
5491 | } |
5492 | ||
9cf7c104 PB |
5493 | static u32 io_get_sequence(struct io_kiocb *req) |
5494 | { | |
5495 | struct io_kiocb *pos; | |
5496 | struct io_ring_ctx *ctx = req->ctx; | |
5497 | u32 total_submitted, nr_reqs = 1; | |
5498 | ||
5499 | if (req->flags & REQ_F_LINK_HEAD) | |
5500 | list_for_each_entry(pos, &req->link_list, link_list) | |
5501 | nr_reqs++; | |
5502 | ||
5503 | total_submitted = ctx->cached_sq_head - ctx->cached_sq_dropped; | |
5504 | return total_submitted - nr_reqs; | |
5505 | } | |
5506 | ||
3529d8c2 | 5507 | static int io_req_defer(struct io_kiocb *req, const struct io_uring_sqe *sqe) |
de0617e4 | 5508 | { |
a197f664 | 5509 | struct io_ring_ctx *ctx = req->ctx; |
27dc8338 | 5510 | struct io_defer_entry *de; |
f67676d1 | 5511 | int ret; |
9cf7c104 | 5512 | u32 seq; |
de0617e4 | 5513 | |
9d858b21 | 5514 | /* Still need defer if there is pending req in defer list. */ |
9cf7c104 PB |
5515 | if (likely(list_empty_careful(&ctx->defer_list) && |
5516 | !(req->flags & REQ_F_IO_DRAIN))) | |
5517 | return 0; | |
5518 | ||
5519 | seq = io_get_sequence(req); | |
5520 | /* Still a chance to pass the sequence check */ | |
5521 | if (!req_need_defer(req, seq) && list_empty_careful(&ctx->defer_list)) | |
de0617e4 JA |
5522 | return 0; |
5523 | ||
650b5481 | 5524 | if (!req->io) { |
650b5481 | 5525 | ret = io_req_defer_prep(req, sqe); |
327d6d96 | 5526 | if (ret) |
650b5481 PB |
5527 | return ret; |
5528 | } | |
cbdcb435 | 5529 | io_prep_async_link(req); |
27dc8338 PB |
5530 | de = kmalloc(sizeof(*de), GFP_KERNEL); |
5531 | if (!de) | |
5532 | return -ENOMEM; | |
2d28390a | 5533 | |
de0617e4 | 5534 | spin_lock_irq(&ctx->completion_lock); |
9cf7c104 | 5535 | if (!req_need_defer(req, seq) && list_empty(&ctx->defer_list)) { |
de0617e4 | 5536 | spin_unlock_irq(&ctx->completion_lock); |
27dc8338 | 5537 | kfree(de); |
ae34817b PB |
5538 | io_queue_async_work(req); |
5539 | return -EIOCBQUEUED; | |
de0617e4 JA |
5540 | } |
5541 | ||
915967f6 | 5542 | trace_io_uring_defer(ctx, req, req->user_data); |
27dc8338 | 5543 | de->req = req; |
9cf7c104 | 5544 | de->seq = seq; |
27dc8338 | 5545 | list_add_tail(&de->list, &ctx->defer_list); |
de0617e4 JA |
5546 | spin_unlock_irq(&ctx->completion_lock); |
5547 | return -EIOCBQUEUED; | |
5548 | } | |
5549 | ||
3ca405eb | 5550 | static void __io_clean_op(struct io_kiocb *req) |
99bc4c38 PB |
5551 | { |
5552 | struct io_async_ctx *io = req->io; | |
5553 | ||
0e1b6fe3 PB |
5554 | if (req->flags & REQ_F_BUFFER_SELECTED) { |
5555 | switch (req->opcode) { | |
5556 | case IORING_OP_READV: | |
5557 | case IORING_OP_READ_FIXED: | |
5558 | case IORING_OP_READ: | |
bcda7baa | 5559 | kfree((void *)(unsigned long)req->rw.addr); |
0e1b6fe3 PB |
5560 | break; |
5561 | case IORING_OP_RECVMSG: | |
5562 | case IORING_OP_RECV: | |
bcda7baa | 5563 | kfree(req->sr_msg.kbuf); |
0e1b6fe3 PB |
5564 | break; |
5565 | } | |
5566 | req->flags &= ~REQ_F_BUFFER_SELECTED; | |
99bc4c38 PB |
5567 | } |
5568 | ||
0e1b6fe3 PB |
5569 | if (req->flags & REQ_F_NEED_CLEANUP) { |
5570 | switch (req->opcode) { | |
5571 | case IORING_OP_READV: | |
5572 | case IORING_OP_READ_FIXED: | |
5573 | case IORING_OP_READ: | |
5574 | case IORING_OP_WRITEV: | |
5575 | case IORING_OP_WRITE_FIXED: | |
5576 | case IORING_OP_WRITE: | |
5577 | if (io->rw.iov != io->rw.fast_iov) | |
5578 | kfree(io->rw.iov); | |
5579 | break; | |
5580 | case IORING_OP_RECVMSG: | |
5581 | case IORING_OP_SENDMSG: | |
5582 | if (io->msg.iov != io->msg.fast_iov) | |
5583 | kfree(io->msg.iov); | |
5584 | break; | |
5585 | case IORING_OP_SPLICE: | |
5586 | case IORING_OP_TEE: | |
5587 | io_put_file(req, req->splice.file_in, | |
5588 | (req->splice.flags & SPLICE_F_FD_IN_FIXED)); | |
5589 | break; | |
5590 | } | |
5591 | req->flags &= ~REQ_F_NEED_CLEANUP; | |
99bc4c38 | 5592 | } |
99bc4c38 PB |
5593 | } |
5594 | ||
3529d8c2 | 5595 | static int io_issue_sqe(struct io_kiocb *req, const struct io_uring_sqe *sqe, |
f13fad7b | 5596 | bool force_nonblock, struct io_comp_state *cs) |
2b188cc1 | 5597 | { |
a197f664 | 5598 | struct io_ring_ctx *ctx = req->ctx; |
d625c6ee | 5599 | int ret; |
2b188cc1 | 5600 | |
d625c6ee | 5601 | switch (req->opcode) { |
2b188cc1 | 5602 | case IORING_OP_NOP: |
229a7b63 | 5603 | ret = io_nop(req, cs); |
2b188cc1 JA |
5604 | break; |
5605 | case IORING_OP_READV: | |
edafccee | 5606 | case IORING_OP_READ_FIXED: |
3a6820f2 | 5607 | case IORING_OP_READ: |
3529d8c2 JA |
5608 | if (sqe) { |
5609 | ret = io_read_prep(req, sqe, force_nonblock); | |
5610 | if (ret < 0) | |
5611 | break; | |
5612 | } | |
a1d7c393 | 5613 | ret = io_read(req, force_nonblock, cs); |
edafccee | 5614 | break; |
3529d8c2 | 5615 | case IORING_OP_WRITEV: |
edafccee | 5616 | case IORING_OP_WRITE_FIXED: |
3a6820f2 | 5617 | case IORING_OP_WRITE: |
3529d8c2 JA |
5618 | if (sqe) { |
5619 | ret = io_write_prep(req, sqe, force_nonblock); | |
5620 | if (ret < 0) | |
5621 | break; | |
5622 | } | |
a1d7c393 | 5623 | ret = io_write(req, force_nonblock, cs); |
2b188cc1 | 5624 | break; |
c992fe29 | 5625 | case IORING_OP_FSYNC: |
3529d8c2 JA |
5626 | if (sqe) { |
5627 | ret = io_prep_fsync(req, sqe); | |
5628 | if (ret < 0) | |
5629 | break; | |
5630 | } | |
014db007 | 5631 | ret = io_fsync(req, force_nonblock); |
c992fe29 | 5632 | break; |
221c5eb2 | 5633 | case IORING_OP_POLL_ADD: |
3529d8c2 JA |
5634 | if (sqe) { |
5635 | ret = io_poll_add_prep(req, sqe); | |
5636 | if (ret) | |
5637 | break; | |
5638 | } | |
014db007 | 5639 | ret = io_poll_add(req); |
221c5eb2 JA |
5640 | break; |
5641 | case IORING_OP_POLL_REMOVE: | |
3529d8c2 JA |
5642 | if (sqe) { |
5643 | ret = io_poll_remove_prep(req, sqe); | |
5644 | if (ret < 0) | |
5645 | break; | |
5646 | } | |
fc4df999 | 5647 | ret = io_poll_remove(req); |
221c5eb2 | 5648 | break; |
5d17b4a4 | 5649 | case IORING_OP_SYNC_FILE_RANGE: |
3529d8c2 JA |
5650 | if (sqe) { |
5651 | ret = io_prep_sfr(req, sqe); | |
5652 | if (ret < 0) | |
5653 | break; | |
5654 | } | |
014db007 | 5655 | ret = io_sync_file_range(req, force_nonblock); |
5d17b4a4 | 5656 | break; |
0fa03c62 | 5657 | case IORING_OP_SENDMSG: |
fddaface | 5658 | case IORING_OP_SEND: |
3529d8c2 JA |
5659 | if (sqe) { |
5660 | ret = io_sendmsg_prep(req, sqe); | |
5661 | if (ret < 0) | |
5662 | break; | |
5663 | } | |
fddaface | 5664 | if (req->opcode == IORING_OP_SENDMSG) |
229a7b63 | 5665 | ret = io_sendmsg(req, force_nonblock, cs); |
fddaface | 5666 | else |
229a7b63 | 5667 | ret = io_send(req, force_nonblock, cs); |
0fa03c62 | 5668 | break; |
aa1fa28f | 5669 | case IORING_OP_RECVMSG: |
fddaface | 5670 | case IORING_OP_RECV: |
3529d8c2 JA |
5671 | if (sqe) { |
5672 | ret = io_recvmsg_prep(req, sqe); | |
5673 | if (ret) | |
5674 | break; | |
5675 | } | |
fddaface | 5676 | if (req->opcode == IORING_OP_RECVMSG) |
229a7b63 | 5677 | ret = io_recvmsg(req, force_nonblock, cs); |
fddaface | 5678 | else |
229a7b63 | 5679 | ret = io_recv(req, force_nonblock, cs); |
aa1fa28f | 5680 | break; |
5262f567 | 5681 | case IORING_OP_TIMEOUT: |
3529d8c2 JA |
5682 | if (sqe) { |
5683 | ret = io_timeout_prep(req, sqe, false); | |
5684 | if (ret) | |
5685 | break; | |
5686 | } | |
fc4df999 | 5687 | ret = io_timeout(req); |
5262f567 | 5688 | break; |
11365043 | 5689 | case IORING_OP_TIMEOUT_REMOVE: |
3529d8c2 JA |
5690 | if (sqe) { |
5691 | ret = io_timeout_remove_prep(req, sqe); | |
5692 | if (ret) | |
5693 | break; | |
5694 | } | |
fc4df999 | 5695 | ret = io_timeout_remove(req); |
11365043 | 5696 | break; |
17f2fe35 | 5697 | case IORING_OP_ACCEPT: |
3529d8c2 JA |
5698 | if (sqe) { |
5699 | ret = io_accept_prep(req, sqe); | |
5700 | if (ret) | |
5701 | break; | |
5702 | } | |
229a7b63 | 5703 | ret = io_accept(req, force_nonblock, cs); |
17f2fe35 | 5704 | break; |
f8e85cf2 | 5705 | case IORING_OP_CONNECT: |
3529d8c2 JA |
5706 | if (sqe) { |
5707 | ret = io_connect_prep(req, sqe); | |
5708 | if (ret) | |
5709 | break; | |
5710 | } | |
229a7b63 | 5711 | ret = io_connect(req, force_nonblock, cs); |
f8e85cf2 | 5712 | break; |
62755e35 | 5713 | case IORING_OP_ASYNC_CANCEL: |
3529d8c2 JA |
5714 | if (sqe) { |
5715 | ret = io_async_cancel_prep(req, sqe); | |
5716 | if (ret) | |
5717 | break; | |
5718 | } | |
014db007 | 5719 | ret = io_async_cancel(req); |
62755e35 | 5720 | break; |
d63d1b5e JA |
5721 | case IORING_OP_FALLOCATE: |
5722 | if (sqe) { | |
5723 | ret = io_fallocate_prep(req, sqe); | |
5724 | if (ret) | |
5725 | break; | |
5726 | } | |
014db007 | 5727 | ret = io_fallocate(req, force_nonblock); |
d63d1b5e | 5728 | break; |
15b71abe JA |
5729 | case IORING_OP_OPENAT: |
5730 | if (sqe) { | |
5731 | ret = io_openat_prep(req, sqe); | |
5732 | if (ret) | |
5733 | break; | |
5734 | } | |
014db007 | 5735 | ret = io_openat(req, force_nonblock); |
15b71abe | 5736 | break; |
b5dba59e JA |
5737 | case IORING_OP_CLOSE: |
5738 | if (sqe) { | |
5739 | ret = io_close_prep(req, sqe); | |
5740 | if (ret) | |
5741 | break; | |
5742 | } | |
229a7b63 | 5743 | ret = io_close(req, force_nonblock, cs); |
b5dba59e | 5744 | break; |
05f3fb3c JA |
5745 | case IORING_OP_FILES_UPDATE: |
5746 | if (sqe) { | |
5747 | ret = io_files_update_prep(req, sqe); | |
5748 | if (ret) | |
5749 | break; | |
5750 | } | |
229a7b63 | 5751 | ret = io_files_update(req, force_nonblock, cs); |
05f3fb3c | 5752 | break; |
eddc7ef5 JA |
5753 | case IORING_OP_STATX: |
5754 | if (sqe) { | |
5755 | ret = io_statx_prep(req, sqe); | |
5756 | if (ret) | |
5757 | break; | |
5758 | } | |
014db007 | 5759 | ret = io_statx(req, force_nonblock); |
eddc7ef5 | 5760 | break; |
4840e418 JA |
5761 | case IORING_OP_FADVISE: |
5762 | if (sqe) { | |
5763 | ret = io_fadvise_prep(req, sqe); | |
5764 | if (ret) | |
5765 | break; | |
5766 | } | |
014db007 | 5767 | ret = io_fadvise(req, force_nonblock); |
4840e418 | 5768 | break; |
c1ca757b JA |
5769 | case IORING_OP_MADVISE: |
5770 | if (sqe) { | |
5771 | ret = io_madvise_prep(req, sqe); | |
5772 | if (ret) | |
5773 | break; | |
5774 | } | |
014db007 | 5775 | ret = io_madvise(req, force_nonblock); |
c1ca757b | 5776 | break; |
cebdb986 JA |
5777 | case IORING_OP_OPENAT2: |
5778 | if (sqe) { | |
5779 | ret = io_openat2_prep(req, sqe); | |
5780 | if (ret) | |
5781 | break; | |
5782 | } | |
014db007 | 5783 | ret = io_openat2(req, force_nonblock); |
cebdb986 | 5784 | break; |
3e4827b0 JA |
5785 | case IORING_OP_EPOLL_CTL: |
5786 | if (sqe) { | |
5787 | ret = io_epoll_ctl_prep(req, sqe); | |
5788 | if (ret) | |
5789 | break; | |
5790 | } | |
229a7b63 | 5791 | ret = io_epoll_ctl(req, force_nonblock, cs); |
3e4827b0 | 5792 | break; |
7d67af2c PB |
5793 | case IORING_OP_SPLICE: |
5794 | if (sqe) { | |
5795 | ret = io_splice_prep(req, sqe); | |
5796 | if (ret < 0) | |
5797 | break; | |
5798 | } | |
014db007 | 5799 | ret = io_splice(req, force_nonblock); |
7d67af2c | 5800 | break; |
ddf0322d JA |
5801 | case IORING_OP_PROVIDE_BUFFERS: |
5802 | if (sqe) { | |
5803 | ret = io_provide_buffers_prep(req, sqe); | |
5804 | if (ret) | |
5805 | break; | |
5806 | } | |
229a7b63 | 5807 | ret = io_provide_buffers(req, force_nonblock, cs); |
ddf0322d | 5808 | break; |
067524e9 JA |
5809 | case IORING_OP_REMOVE_BUFFERS: |
5810 | if (sqe) { | |
5811 | ret = io_remove_buffers_prep(req, sqe); | |
5812 | if (ret) | |
5813 | break; | |
5814 | } | |
229a7b63 | 5815 | ret = io_remove_buffers(req, force_nonblock, cs); |
3e4827b0 | 5816 | break; |
f2a8d5c7 PB |
5817 | case IORING_OP_TEE: |
5818 | if (sqe) { | |
5819 | ret = io_tee_prep(req, sqe); | |
5820 | if (ret < 0) | |
5821 | break; | |
5822 | } | |
5823 | ret = io_tee(req, force_nonblock); | |
5824 | break; | |
2b188cc1 JA |
5825 | default: |
5826 | ret = -EINVAL; | |
5827 | break; | |
5828 | } | |
5829 | ||
def596e9 JA |
5830 | if (ret) |
5831 | return ret; | |
5832 | ||
b532576e JA |
5833 | /* If the op doesn't have a file, we're not polling for it */ |
5834 | if ((ctx->flags & IORING_SETUP_IOPOLL) && req->file) { | |
11ba820b JA |
5835 | const bool in_async = io_wq_current_is_worker(); |
5836 | ||
11ba820b JA |
5837 | /* workqueue context doesn't hold uring_lock, grab it now */ |
5838 | if (in_async) | |
5839 | mutex_lock(&ctx->uring_lock); | |
5840 | ||
def596e9 | 5841 | io_iopoll_req_issued(req); |
11ba820b JA |
5842 | |
5843 | if (in_async) | |
5844 | mutex_unlock(&ctx->uring_lock); | |
def596e9 JA |
5845 | } |
5846 | ||
5847 | return 0; | |
2b188cc1 JA |
5848 | } |
5849 | ||
f4db7182 | 5850 | static struct io_wq_work *io_wq_submit_work(struct io_wq_work *work) |
2b188cc1 JA |
5851 | { |
5852 | struct io_kiocb *req = container_of(work, struct io_kiocb, work); | |
6df1db6b | 5853 | struct io_kiocb *timeout; |
561fb04a | 5854 | int ret = 0; |
2b188cc1 | 5855 | |
6df1db6b PB |
5856 | timeout = io_prep_linked_timeout(req); |
5857 | if (timeout) | |
5858 | io_queue_linked_timeout(timeout); | |
d4c81f38 | 5859 | |
0c9d5ccd JA |
5860 | /* if NO_CANCEL is set, we must still run the work */ |
5861 | if ((work->flags & (IO_WQ_WORK_CANCEL|IO_WQ_WORK_NO_CANCEL)) == | |
5862 | IO_WQ_WORK_CANCEL) { | |
561fb04a | 5863 | ret = -ECANCELED; |
0c9d5ccd | 5864 | } |
31b51510 | 5865 | |
561fb04a | 5866 | if (!ret) { |
561fb04a | 5867 | do { |
f13fad7b | 5868 | ret = io_issue_sqe(req, NULL, false, NULL); |
561fb04a JA |
5869 | /* |
5870 | * We can get EAGAIN for polled IO even though we're | |
5871 | * forcing a sync submission from here, since we can't | |
5872 | * wait for request slots on the block side. | |
5873 | */ | |
5874 | if (ret != -EAGAIN) | |
5875 | break; | |
5876 | cond_resched(); | |
5877 | } while (1); | |
5878 | } | |
31b51510 | 5879 | |
561fb04a | 5880 | if (ret) { |
4e88d6e7 | 5881 | req_set_fail_links(req); |
e1e16097 | 5882 | io_req_complete(req, ret); |
edafccee | 5883 | } |
2b188cc1 | 5884 | |
f4db7182 | 5885 | return io_steal_work(req); |
2b188cc1 JA |
5886 | } |
5887 | ||
65e19f54 JA |
5888 | static inline struct file *io_file_from_index(struct io_ring_ctx *ctx, |
5889 | int index) | |
5890 | { | |
5891 | struct fixed_file_table *table; | |
5892 | ||
05f3fb3c | 5893 | table = &ctx->file_data->table[index >> IORING_FILE_TABLE_SHIFT]; |
84695089 | 5894 | return table->files[index & IORING_FILE_TABLE_MASK]; |
65e19f54 JA |
5895 | } |
5896 | ||
8da11c19 PB |
5897 | static int io_file_get(struct io_submit_state *state, struct io_kiocb *req, |
5898 | int fd, struct file **out_file, bool fixed) | |
09bb8394 | 5899 | { |
a197f664 | 5900 | struct io_ring_ctx *ctx = req->ctx; |
8da11c19 | 5901 | struct file *file; |
09bb8394 | 5902 | |
8da11c19 | 5903 | if (fixed) { |
05f3fb3c | 5904 | if (unlikely(!ctx->file_data || |
09bb8394 JA |
5905 | (unsigned) fd >= ctx->nr_user_files)) |
5906 | return -EBADF; | |
b7620121 | 5907 | fd = array_index_nospec(fd, ctx->nr_user_files); |
8da11c19 | 5908 | file = io_file_from_index(ctx, fd); |
fd2206e4 JA |
5909 | if (file) { |
5910 | req->fixed_file_refs = ctx->file_data->cur_refs; | |
5911 | percpu_ref_get(req->fixed_file_refs); | |
5912 | } | |
09bb8394 | 5913 | } else { |
c826bd7a | 5914 | trace_io_uring_file_get(ctx, fd); |
8da11c19 | 5915 | file = __io_file_get(state, fd); |
09bb8394 JA |
5916 | } |
5917 | ||
fd2206e4 JA |
5918 | if (file || io_op_defs[req->opcode].needs_file_no_error) { |
5919 | *out_file = file; | |
5920 | return 0; | |
5921 | } | |
5922 | return -EBADF; | |
09bb8394 JA |
5923 | } |
5924 | ||
8da11c19 | 5925 | static int io_req_set_file(struct io_submit_state *state, struct io_kiocb *req, |
63ff8223 | 5926 | int fd) |
8da11c19 | 5927 | { |
8da11c19 PB |
5928 | bool fixed; |
5929 | ||
63ff8223 | 5930 | fixed = (req->flags & REQ_F_FIXED_FILE) != 0; |
0cdaf760 | 5931 | if (unlikely(!fixed && io_async_submit(req->ctx))) |
8da11c19 PB |
5932 | return -EBADF; |
5933 | ||
5934 | return io_file_get(state, req, fd, &req->file, fixed); | |
5935 | } | |
5936 | ||
a197f664 | 5937 | static int io_grab_files(struct io_kiocb *req) |
fcb323cc JA |
5938 | { |
5939 | int ret = -EBADF; | |
a197f664 | 5940 | struct io_ring_ctx *ctx = req->ctx; |
fcb323cc | 5941 | |
f56040b8 PB |
5942 | io_req_init_async(req); |
5943 | ||
5b0bbee4 | 5944 | if (req->work.files || (req->flags & REQ_F_NO_FILE_TABLE)) |
f86cd20c | 5945 | return 0; |
b14cca0c | 5946 | if (!ctx->ring_file) |
b5dba59e JA |
5947 | return -EBADF; |
5948 | ||
fcb323cc JA |
5949 | rcu_read_lock(); |
5950 | spin_lock_irq(&ctx->inflight_lock); | |
5951 | /* | |
5952 | * We use the f_ops->flush() handler to ensure that we can flush | |
5953 | * out work accessing these files if the fd is closed. Check if | |
5954 | * the fd has changed since we started down this path, and disallow | |
5955 | * this operation if it has. | |
5956 | */ | |
b14cca0c | 5957 | if (fcheck(ctx->ring_fd) == ctx->ring_file) { |
fcb323cc JA |
5958 | list_add(&req->inflight_entry, &ctx->inflight_list); |
5959 | req->flags |= REQ_F_INFLIGHT; | |
5960 | req->work.files = current->files; | |
5961 | ret = 0; | |
5962 | } | |
5963 | spin_unlock_irq(&ctx->inflight_lock); | |
5964 | rcu_read_unlock(); | |
5965 | ||
5966 | return ret; | |
5967 | } | |
5968 | ||
f56040b8 PB |
5969 | static inline int io_prep_work_files(struct io_kiocb *req) |
5970 | { | |
5971 | if (!io_op_defs[req->opcode].file_table) | |
5972 | return 0; | |
5973 | return io_grab_files(req); | |
5974 | } | |
5975 | ||
2665abfd | 5976 | static enum hrtimer_restart io_link_timeout_fn(struct hrtimer *timer) |
2b188cc1 | 5977 | { |
ad8a48ac JA |
5978 | struct io_timeout_data *data = container_of(timer, |
5979 | struct io_timeout_data, timer); | |
5980 | struct io_kiocb *req = data->req; | |
2665abfd JA |
5981 | struct io_ring_ctx *ctx = req->ctx; |
5982 | struct io_kiocb *prev = NULL; | |
5983 | unsigned long flags; | |
2665abfd JA |
5984 | |
5985 | spin_lock_irqsave(&ctx->completion_lock, flags); | |
5986 | ||
5987 | /* | |
5988 | * We don't expect the list to be empty, that will only happen if we | |
5989 | * race with the completion of the linked work. | |
5990 | */ | |
4493233e PB |
5991 | if (!list_empty(&req->link_list)) { |
5992 | prev = list_entry(req->link_list.prev, struct io_kiocb, | |
5993 | link_list); | |
5d960724 | 5994 | if (refcount_inc_not_zero(&prev->refs)) { |
4493233e | 5995 | list_del_init(&req->link_list); |
5d960724 JA |
5996 | prev->flags &= ~REQ_F_LINK_TIMEOUT; |
5997 | } else | |
76a46e06 | 5998 | prev = NULL; |
2665abfd JA |
5999 | } |
6000 | ||
6001 | spin_unlock_irqrestore(&ctx->completion_lock, flags); | |
6002 | ||
6003 | if (prev) { | |
4e88d6e7 | 6004 | req_set_fail_links(prev); |
014db007 | 6005 | io_async_find_and_cancel(ctx, req, prev->user_data, -ETIME); |
76a46e06 | 6006 | io_put_req(prev); |
47f46768 | 6007 | } else { |
e1e16097 | 6008 | io_req_complete(req, -ETIME); |
2665abfd | 6009 | } |
2665abfd JA |
6010 | return HRTIMER_NORESTART; |
6011 | } | |
6012 | ||
7271ef3a | 6013 | static void __io_queue_linked_timeout(struct io_kiocb *req) |
2665abfd | 6014 | { |
76a46e06 JA |
6015 | /* |
6016 | * If the list is now empty, then our linked request finished before | |
6017 | * we got a chance to setup the timer | |
6018 | */ | |
4493233e | 6019 | if (!list_empty(&req->link_list)) { |
2d28390a | 6020 | struct io_timeout_data *data = &req->io->timeout; |
94ae5e77 | 6021 | |
ad8a48ac JA |
6022 | data->timer.function = io_link_timeout_fn; |
6023 | hrtimer_start(&data->timer, timespec64_to_ktime(data->ts), | |
6024 | data->mode); | |
2665abfd | 6025 | } |
7271ef3a JA |
6026 | } |
6027 | ||
6028 | static void io_queue_linked_timeout(struct io_kiocb *req) | |
6029 | { | |
6030 | struct io_ring_ctx *ctx = req->ctx; | |
6031 | ||
6032 | spin_lock_irq(&ctx->completion_lock); | |
6033 | __io_queue_linked_timeout(req); | |
76a46e06 | 6034 | spin_unlock_irq(&ctx->completion_lock); |
2665abfd | 6035 | |
2665abfd | 6036 | /* drop submission reference */ |
76a46e06 JA |
6037 | io_put_req(req); |
6038 | } | |
2665abfd | 6039 | |
ad8a48ac | 6040 | static struct io_kiocb *io_prep_linked_timeout(struct io_kiocb *req) |
2665abfd JA |
6041 | { |
6042 | struct io_kiocb *nxt; | |
6043 | ||
dea3b49c | 6044 | if (!(req->flags & REQ_F_LINK_HEAD)) |
2665abfd | 6045 | return NULL; |
6df1db6b | 6046 | if (req->flags & REQ_F_LINK_TIMEOUT) |
d7718a9d | 6047 | return NULL; |
2665abfd | 6048 | |
4493233e PB |
6049 | nxt = list_first_entry_or_null(&req->link_list, struct io_kiocb, |
6050 | link_list); | |
d625c6ee | 6051 | if (!nxt || nxt->opcode != IORING_OP_LINK_TIMEOUT) |
76a46e06 | 6052 | return NULL; |
2665abfd | 6053 | |
76a46e06 | 6054 | req->flags |= REQ_F_LINK_TIMEOUT; |
76a46e06 | 6055 | return nxt; |
2665abfd JA |
6056 | } |
6057 | ||
f13fad7b JA |
6058 | static void __io_queue_sqe(struct io_kiocb *req, const struct io_uring_sqe *sqe, |
6059 | struct io_comp_state *cs) | |
2b188cc1 | 6060 | { |
4a0a7a18 | 6061 | struct io_kiocb *linked_timeout; |
4bc4494e | 6062 | struct io_kiocb *nxt; |
193155c8 | 6063 | const struct cred *old_creds = NULL; |
e0c5c576 | 6064 | int ret; |
2b188cc1 | 6065 | |
4a0a7a18 JA |
6066 | again: |
6067 | linked_timeout = io_prep_linked_timeout(req); | |
6068 | ||
7cdaf587 XW |
6069 | if ((req->flags & REQ_F_WORK_INITIALIZED) && req->work.creds && |
6070 | req->work.creds != current_cred()) { | |
193155c8 JA |
6071 | if (old_creds) |
6072 | revert_creds(old_creds); | |
6073 | if (old_creds == req->work.creds) | |
6074 | old_creds = NULL; /* restored original creds */ | |
6075 | else | |
6076 | old_creds = override_creds(req->work.creds); | |
6077 | } | |
6078 | ||
f13fad7b | 6079 | ret = io_issue_sqe(req, sqe, true, cs); |
491381ce JA |
6080 | |
6081 | /* | |
6082 | * We async punt it if the file wasn't marked NOWAIT, or if the file | |
6083 | * doesn't support non-blocking read/write attempts | |
6084 | */ | |
24c74678 | 6085 | if (ret == -EAGAIN && !(req->flags & REQ_F_NOWAIT)) { |
f063c547 | 6086 | if (!io_arm_poll_handler(req)) { |
86a761f8 | 6087 | punt: |
f063c547 PB |
6088 | ret = io_prep_work_files(req); |
6089 | if (unlikely(ret)) | |
bbad27b2 | 6090 | goto err; |
f063c547 PB |
6091 | /* |
6092 | * Queued up for async execution, worker will release | |
6093 | * submit reference when the iocb is actually submitted. | |
6094 | */ | |
6095 | io_queue_async_work(req); | |
2b188cc1 | 6096 | } |
bbad27b2 | 6097 | |
f063c547 PB |
6098 | if (linked_timeout) |
6099 | io_queue_linked_timeout(linked_timeout); | |
4bc4494e | 6100 | goto exit; |
2b188cc1 | 6101 | } |
e65ef56d | 6102 | |
652532ad | 6103 | if (unlikely(ret)) { |
fcb323cc | 6104 | err: |
652532ad PB |
6105 | /* un-prep timeout, so it'll be killed as any other linked */ |
6106 | req->flags &= ~REQ_F_LINK_TIMEOUT; | |
4e88d6e7 | 6107 | req_set_fail_links(req); |
e65ef56d | 6108 | io_put_req(req); |
e1e16097 | 6109 | io_req_complete(req, ret); |
652532ad | 6110 | goto exit; |
9e645e11 | 6111 | } |
652532ad PB |
6112 | |
6113 | /* drop submission reference */ | |
6114 | nxt = io_put_req_find_next(req); | |
6115 | if (linked_timeout) | |
6116 | io_queue_linked_timeout(linked_timeout); | |
6117 | ||
4a0a7a18 JA |
6118 | if (nxt) { |
6119 | req = nxt; | |
86a761f8 PB |
6120 | |
6121 | if (req->flags & REQ_F_FORCE_ASYNC) | |
6122 | goto punt; | |
4a0a7a18 JA |
6123 | goto again; |
6124 | } | |
4bc4494e | 6125 | exit: |
193155c8 JA |
6126 | if (old_creds) |
6127 | revert_creds(old_creds); | |
2b188cc1 JA |
6128 | } |
6129 | ||
f13fad7b JA |
6130 | static void io_queue_sqe(struct io_kiocb *req, const struct io_uring_sqe *sqe, |
6131 | struct io_comp_state *cs) | |
4fe2c963 JL |
6132 | { |
6133 | int ret; | |
6134 | ||
3529d8c2 | 6135 | ret = io_req_defer(req, sqe); |
4fe2c963 JL |
6136 | if (ret) { |
6137 | if (ret != -EIOCBQUEUED) { | |
1118591a | 6138 | fail_req: |
4e88d6e7 | 6139 | req_set_fail_links(req); |
e1e16097 JA |
6140 | io_put_req(req); |
6141 | io_req_complete(req, ret); | |
4fe2c963 | 6142 | } |
2550878f | 6143 | } else if (req->flags & REQ_F_FORCE_ASYNC) { |
bd2ab18a | 6144 | if (!req->io) { |
bd2ab18a | 6145 | ret = io_req_defer_prep(req, sqe); |
327d6d96 | 6146 | if (unlikely(ret)) |
bd2ab18a PB |
6147 | goto fail_req; |
6148 | } | |
6149 | ||
ce35a47a JA |
6150 | /* |
6151 | * Never try inline submit of IOSQE_ASYNC is set, go straight | |
6152 | * to async execution. | |
6153 | */ | |
3e863ea3 | 6154 | io_req_init_async(req); |
ce35a47a JA |
6155 | req->work.flags |= IO_WQ_WORK_CONCURRENT; |
6156 | io_queue_async_work(req); | |
6157 | } else { | |
f13fad7b | 6158 | __io_queue_sqe(req, sqe, cs); |
ce35a47a | 6159 | } |
4fe2c963 JL |
6160 | } |
6161 | ||
f13fad7b JA |
6162 | static inline void io_queue_link_head(struct io_kiocb *req, |
6163 | struct io_comp_state *cs) | |
4fe2c963 | 6164 | { |
94ae5e77 | 6165 | if (unlikely(req->flags & REQ_F_FAIL_LINK)) { |
e1e16097 JA |
6166 | io_put_req(req); |
6167 | io_req_complete(req, -ECANCELED); | |
1b4a51b6 | 6168 | } else |
f13fad7b | 6169 | io_queue_sqe(req, NULL, cs); |
4fe2c963 JL |
6170 | } |
6171 | ||
1d4240cc | 6172 | static int io_submit_sqe(struct io_kiocb *req, const struct io_uring_sqe *sqe, |
f13fad7b | 6173 | struct io_kiocb **link, struct io_comp_state *cs) |
9e645e11 | 6174 | { |
a197f664 | 6175 | struct io_ring_ctx *ctx = req->ctx; |
ef4ff581 | 6176 | int ret; |
9e645e11 | 6177 | |
9e645e11 JA |
6178 | /* |
6179 | * If we already have a head request, queue this one for async | |
6180 | * submittal once the head completes. If we don't have a head but | |
6181 | * IOSQE_IO_LINK is set in the sqe, start a new head. This one will be | |
6182 | * submitted sync once the chain is complete. If none of those | |
6183 | * conditions are true (normal request), then just queue it. | |
6184 | */ | |
6185 | if (*link) { | |
9d76377f | 6186 | struct io_kiocb *head = *link; |
4e88d6e7 | 6187 | |
8cdf2193 PB |
6188 | /* |
6189 | * Taking sequential execution of a link, draining both sides | |
6190 | * of the link also fullfils IOSQE_IO_DRAIN semantics for all | |
6191 | * requests in the link. So, it drains the head and the | |
6192 | * next after the link request. The last one is done via | |
6193 | * drain_next flag to persist the effect across calls. | |
6194 | */ | |
ef4ff581 | 6195 | if (req->flags & REQ_F_IO_DRAIN) { |
711be031 PB |
6196 | head->flags |= REQ_F_IO_DRAIN; |
6197 | ctx->drain_next = 1; | |
6198 | } | |
3529d8c2 | 6199 | ret = io_req_defer_prep(req, sqe); |
327d6d96 | 6200 | if (unlikely(ret)) { |
4e88d6e7 | 6201 | /* fail even hard links since we don't submit */ |
9d76377f | 6202 | head->flags |= REQ_F_FAIL_LINK; |
1d4240cc | 6203 | return ret; |
2d28390a | 6204 | } |
9d76377f | 6205 | trace_io_uring_link(ctx, req, head); |
c40f6379 | 6206 | io_get_req_task(req); |
9d76377f | 6207 | list_add_tail(&req->link_list, &head->link_list); |
32fe525b PB |
6208 | |
6209 | /* last request of a link, enqueue the link */ | |
ef4ff581 | 6210 | if (!(req->flags & (REQ_F_LINK | REQ_F_HARDLINK))) { |
f13fad7b | 6211 | io_queue_link_head(head, cs); |
32fe525b PB |
6212 | *link = NULL; |
6213 | } | |
9e645e11 | 6214 | } else { |
711be031 PB |
6215 | if (unlikely(ctx->drain_next)) { |
6216 | req->flags |= REQ_F_IO_DRAIN; | |
ef4ff581 | 6217 | ctx->drain_next = 0; |
711be031 | 6218 | } |
ef4ff581 | 6219 | if (req->flags & (REQ_F_LINK | REQ_F_HARDLINK)) { |
dea3b49c | 6220 | req->flags |= REQ_F_LINK_HEAD; |
711be031 | 6221 | INIT_LIST_HEAD(&req->link_list); |
f1d96a8f | 6222 | |
711be031 | 6223 | ret = io_req_defer_prep(req, sqe); |
327d6d96 | 6224 | if (unlikely(ret)) |
711be031 PB |
6225 | req->flags |= REQ_F_FAIL_LINK; |
6226 | *link = req; | |
6227 | } else { | |
f13fad7b | 6228 | io_queue_sqe(req, sqe, cs); |
711be031 | 6229 | } |
9e645e11 | 6230 | } |
2e6e1fde | 6231 | |
1d4240cc | 6232 | return 0; |
9e645e11 JA |
6233 | } |
6234 | ||
9a56a232 JA |
6235 | /* |
6236 | * Batched submission is done, ensure local IO is flushed out. | |
6237 | */ | |
6238 | static void io_submit_state_end(struct io_submit_state *state) | |
6239 | { | |
f13fad7b JA |
6240 | if (!list_empty(&state->comp.list)) |
6241 | io_submit_flush_completions(&state->comp); | |
9a56a232 | 6242 | blk_finish_plug(&state->plug); |
9f13c35b | 6243 | io_state_file_put(state); |
2579f913 | 6244 | if (state->free_reqs) |
6c8a3134 | 6245 | kmem_cache_free_bulk(req_cachep, state->free_reqs, state->reqs); |
9a56a232 JA |
6246 | } |
6247 | ||
6248 | /* | |
6249 | * Start submission side cache. | |
6250 | */ | |
6251 | static void io_submit_state_start(struct io_submit_state *state, | |
013538bd | 6252 | struct io_ring_ctx *ctx, unsigned int max_ios) |
9a56a232 JA |
6253 | { |
6254 | blk_start_plug(&state->plug); | |
b63534c4 JA |
6255 | #ifdef CONFIG_BLOCK |
6256 | state->plug.nowait = true; | |
6257 | #endif | |
013538bd JA |
6258 | state->comp.nr = 0; |
6259 | INIT_LIST_HEAD(&state->comp.list); | |
6260 | state->comp.ctx = ctx; | |
2579f913 | 6261 | state->free_reqs = 0; |
9a56a232 JA |
6262 | state->file = NULL; |
6263 | state->ios_left = max_ios; | |
6264 | } | |
6265 | ||
2b188cc1 JA |
6266 | static void io_commit_sqring(struct io_ring_ctx *ctx) |
6267 | { | |
75b28aff | 6268 | struct io_rings *rings = ctx->rings; |
2b188cc1 | 6269 | |
caf582c6 PB |
6270 | /* |
6271 | * Ensure any loads from the SQEs are done at this point, | |
6272 | * since once we write the new head, the application could | |
6273 | * write new data to them. | |
6274 | */ | |
6275 | smp_store_release(&rings->sq.head, ctx->cached_sq_head); | |
2b188cc1 JA |
6276 | } |
6277 | ||
2b188cc1 | 6278 | /* |
3529d8c2 | 6279 | * Fetch an sqe, if one is available. Note that sqe_ptr will point to memory |
2b188cc1 JA |
6280 | * that is mapped by userspace. This means that care needs to be taken to |
6281 | * ensure that reads are stable, as we cannot rely on userspace always | |
6282 | * being a good citizen. If members of the sqe are validated and then later | |
6283 | * used, it's important that those reads are done through READ_ONCE() to | |
6284 | * prevent a re-load down the line. | |
6285 | */ | |
709b302f | 6286 | static const struct io_uring_sqe *io_get_sqe(struct io_ring_ctx *ctx) |
2b188cc1 | 6287 | { |
75b28aff | 6288 | u32 *sq_array = ctx->sq_array; |
2b188cc1 JA |
6289 | unsigned head; |
6290 | ||
6291 | /* | |
6292 | * The cached sq head (or cq tail) serves two purposes: | |
6293 | * | |
6294 | * 1) allows us to batch the cost of updating the user visible | |
6295 | * head updates. | |
6296 | * 2) allows the kernel side to track the head on its own, even | |
6297 | * though the application is the one updating it. | |
6298 | */ | |
ee7d46d9 | 6299 | head = READ_ONCE(sq_array[ctx->cached_sq_head & ctx->sq_mask]); |
709b302f PB |
6300 | if (likely(head < ctx->sq_entries)) |
6301 | return &ctx->sq_sqes[head]; | |
2b188cc1 JA |
6302 | |
6303 | /* drop invalid entries */ | |
498ccd9e | 6304 | ctx->cached_sq_dropped++; |
ee7d46d9 | 6305 | WRITE_ONCE(ctx->rings->sq_dropped, ctx->cached_sq_dropped); |
709b302f PB |
6306 | return NULL; |
6307 | } | |
6308 | ||
6309 | static inline void io_consume_sqe(struct io_ring_ctx *ctx) | |
6310 | { | |
6311 | ctx->cached_sq_head++; | |
2b188cc1 JA |
6312 | } |
6313 | ||
ef4ff581 PB |
6314 | #define SQE_VALID_FLAGS (IOSQE_FIXED_FILE|IOSQE_IO_DRAIN|IOSQE_IO_LINK| \ |
6315 | IOSQE_IO_HARDLINK | IOSQE_ASYNC | \ | |
6316 | IOSQE_BUFFER_SELECT) | |
6317 | ||
6318 | static int io_init_req(struct io_ring_ctx *ctx, struct io_kiocb *req, | |
6319 | const struct io_uring_sqe *sqe, | |
0cdaf760 | 6320 | struct io_submit_state *state) |
0553b8bd | 6321 | { |
ef4ff581 | 6322 | unsigned int sqe_flags; |
63ff8223 | 6323 | int id; |
ef4ff581 | 6324 | |
0553b8bd PB |
6325 | req->opcode = READ_ONCE(sqe->opcode); |
6326 | req->user_data = READ_ONCE(sqe->user_data); | |
6327 | req->io = NULL; | |
6328 | req->file = NULL; | |
6329 | req->ctx = ctx; | |
6330 | req->flags = 0; | |
6331 | /* one is dropped after submission, the other at completion */ | |
6332 | refcount_set(&req->refs, 2); | |
4dd2824d | 6333 | req->task = current; |
0553b8bd | 6334 | req->result = 0; |
ef4ff581 PB |
6335 | |
6336 | if (unlikely(req->opcode >= IORING_OP_LAST)) | |
6337 | return -EINVAL; | |
6338 | ||
9d8426a0 JA |
6339 | if (unlikely(io_sq_thread_acquire_mm(ctx, req))) |
6340 | return -EFAULT; | |
ef4ff581 PB |
6341 | |
6342 | sqe_flags = READ_ONCE(sqe->flags); | |
6343 | /* enforce forwards compatibility on users */ | |
6344 | if (unlikely(sqe_flags & ~SQE_VALID_FLAGS)) | |
6345 | return -EINVAL; | |
6346 | ||
6347 | if ((sqe_flags & IOSQE_BUFFER_SELECT) && | |
6348 | !io_op_defs[req->opcode].buffer_select) | |
6349 | return -EOPNOTSUPP; | |
6350 | ||
6351 | id = READ_ONCE(sqe->personality); | |
6352 | if (id) { | |
7cdaf587 | 6353 | io_req_init_async(req); |
ef4ff581 PB |
6354 | req->work.creds = idr_find(&ctx->personality_idr, id); |
6355 | if (unlikely(!req->work.creds)) | |
6356 | return -EINVAL; | |
6357 | get_cred(req->work.creds); | |
6358 | } | |
6359 | ||
6360 | /* same numerical values with corresponding REQ_F_*, safe to copy */ | |
c11368a5 | 6361 | req->flags |= sqe_flags; |
ef4ff581 | 6362 | |
63ff8223 JA |
6363 | if (!io_op_defs[req->opcode].needs_file) |
6364 | return 0; | |
6365 | ||
6366 | return io_req_set_file(state, req, READ_ONCE(sqe->fd)); | |
0553b8bd PB |
6367 | } |
6368 | ||
fb5ccc98 | 6369 | static int io_submit_sqes(struct io_ring_ctx *ctx, unsigned int nr, |
0cdaf760 | 6370 | struct file *ring_file, int ring_fd) |
6c271ce2 | 6371 | { |
ac8691c4 | 6372 | struct io_submit_state state; |
9e645e11 | 6373 | struct io_kiocb *link = NULL; |
9e645e11 | 6374 | int i, submitted = 0; |
6c271ce2 | 6375 | |
c4a2ed72 | 6376 | /* if we have a backlog and couldn't flush it all, return BUSY */ |
ad3eb2c8 JA |
6377 | if (test_bit(0, &ctx->sq_check_overflow)) { |
6378 | if (!list_empty(&ctx->cq_overflow_list) && | |
6379 | !io_cqring_overflow_flush(ctx, false)) | |
6380 | return -EBUSY; | |
6381 | } | |
6c271ce2 | 6382 | |
ee7d46d9 PB |
6383 | /* make sure SQ entry isn't read before tail */ |
6384 | nr = min3(nr, ctx->sq_entries, io_sqring_entries(ctx)); | |
9ef4f124 | 6385 | |
2b85edfc PB |
6386 | if (!percpu_ref_tryget_many(&ctx->refs, nr)) |
6387 | return -EAGAIN; | |
6c271ce2 | 6388 | |
013538bd | 6389 | io_submit_state_start(&state, ctx, nr); |
6c271ce2 | 6390 | |
b14cca0c PB |
6391 | ctx->ring_fd = ring_fd; |
6392 | ctx->ring_file = ring_file; | |
6393 | ||
6c271ce2 | 6394 | for (i = 0; i < nr; i++) { |
3529d8c2 | 6395 | const struct io_uring_sqe *sqe; |
196be95c | 6396 | struct io_kiocb *req; |
1cb1edb2 | 6397 | int err; |
fb5ccc98 | 6398 | |
b1e50e54 PB |
6399 | sqe = io_get_sqe(ctx); |
6400 | if (unlikely(!sqe)) { | |
6401 | io_consume_sqe(ctx); | |
6402 | break; | |
6403 | } | |
ac8691c4 | 6404 | req = io_alloc_req(ctx, &state); |
196be95c PB |
6405 | if (unlikely(!req)) { |
6406 | if (!submitted) | |
6407 | submitted = -EAGAIN; | |
fb5ccc98 | 6408 | break; |
196be95c | 6409 | } |
fb5ccc98 | 6410 | |
ac8691c4 | 6411 | err = io_init_req(ctx, req, sqe, &state); |
709b302f | 6412 | io_consume_sqe(ctx); |
d3656344 JA |
6413 | /* will complete beyond this point, count as submitted */ |
6414 | submitted++; | |
6415 | ||
ef4ff581 | 6416 | if (unlikely(err)) { |
1cb1edb2 | 6417 | fail_req: |
e1e16097 JA |
6418 | io_put_req(req); |
6419 | io_req_complete(req, err); | |
196be95c PB |
6420 | break; |
6421 | } | |
fb5ccc98 | 6422 | |
354420f7 | 6423 | trace_io_uring_submit_sqe(ctx, req->opcode, req->user_data, |
0cdaf760 | 6424 | true, io_async_submit(ctx)); |
f13fad7b | 6425 | err = io_submit_sqe(req, sqe, &link, &state.comp); |
1d4240cc PB |
6426 | if (err) |
6427 | goto fail_req; | |
6c271ce2 JA |
6428 | } |
6429 | ||
9466f437 PB |
6430 | if (unlikely(submitted != nr)) { |
6431 | int ref_used = (submitted == -EAGAIN) ? 0 : submitted; | |
6432 | ||
6433 | percpu_ref_put_many(&ctx->refs, nr - ref_used); | |
6434 | } | |
9e645e11 | 6435 | if (link) |
f13fad7b | 6436 | io_queue_link_head(link, &state.comp); |
ac8691c4 | 6437 | io_submit_state_end(&state); |
6c271ce2 | 6438 | |
ae9428ca PB |
6439 | /* Commit SQ ring head once we've consumed and submitted all SQEs */ |
6440 | io_commit_sqring(ctx); | |
6441 | ||
6c271ce2 JA |
6442 | return submitted; |
6443 | } | |
6444 | ||
23b3628e XW |
6445 | static inline void io_ring_set_wakeup_flag(struct io_ring_ctx *ctx) |
6446 | { | |
6447 | /* Tell userspace we may need a wakeup call */ | |
6448 | spin_lock_irq(&ctx->completion_lock); | |
6449 | ctx->rings->sq_flags |= IORING_SQ_NEED_WAKEUP; | |
6450 | spin_unlock_irq(&ctx->completion_lock); | |
6451 | } | |
6452 | ||
6453 | static inline void io_ring_clear_wakeup_flag(struct io_ring_ctx *ctx) | |
6454 | { | |
6455 | spin_lock_irq(&ctx->completion_lock); | |
6456 | ctx->rings->sq_flags &= ~IORING_SQ_NEED_WAKEUP; | |
6457 | spin_unlock_irq(&ctx->completion_lock); | |
6458 | } | |
6459 | ||
6c271ce2 JA |
6460 | static int io_sq_thread(void *data) |
6461 | { | |
6c271ce2 | 6462 | struct io_ring_ctx *ctx = data; |
181e448d | 6463 | const struct cred *old_cred; |
6c271ce2 | 6464 | DEFINE_WAIT(wait); |
6c271ce2 | 6465 | unsigned long timeout; |
bdcd3eab | 6466 | int ret = 0; |
6c271ce2 | 6467 | |
0f158b4c | 6468 | complete(&ctx->sq_thread_comp); |
a4c0b3de | 6469 | |
181e448d | 6470 | old_cred = override_creds(ctx->creds); |
6c271ce2 | 6471 | |
bdcd3eab | 6472 | timeout = jiffies + ctx->sq_thread_idle; |
2bbcd6d3 | 6473 | while (!kthread_should_park()) { |
fb5ccc98 | 6474 | unsigned int to_submit; |
6c271ce2 | 6475 | |
540e32a0 | 6476 | if (!list_empty(&ctx->iopoll_list)) { |
6c271ce2 JA |
6477 | unsigned nr_events = 0; |
6478 | ||
bdcd3eab | 6479 | mutex_lock(&ctx->uring_lock); |
540e32a0 | 6480 | if (!list_empty(&ctx->iopoll_list) && !need_resched()) |
9dedd563 | 6481 | io_do_iopoll(ctx, &nr_events, 0); |
bdcd3eab | 6482 | else |
6c271ce2 | 6483 | timeout = jiffies + ctx->sq_thread_idle; |
bdcd3eab | 6484 | mutex_unlock(&ctx->uring_lock); |
6c271ce2 JA |
6485 | } |
6486 | ||
fb5ccc98 | 6487 | to_submit = io_sqring_entries(ctx); |
c1edbf5f JA |
6488 | |
6489 | /* | |
6490 | * If submit got -EBUSY, flag us as needing the application | |
6491 | * to enter the kernel to reap and flush events. | |
6492 | */ | |
b772f07a | 6493 | if (!to_submit || ret == -EBUSY || need_resched()) { |
7143b5ac SG |
6494 | /* |
6495 | * Drop cur_mm before scheduling, we can't hold it for | |
6496 | * long periods (or over schedule()). Do this before | |
6497 | * adding ourselves to the waitqueue, as the unuse/drop | |
6498 | * may sleep. | |
6499 | */ | |
4349f30e | 6500 | io_sq_thread_drop_mm(); |
7143b5ac | 6501 | |
6c271ce2 JA |
6502 | /* |
6503 | * We're polling. If we're within the defined idle | |
6504 | * period, then let us spin without work before going | |
c1edbf5f JA |
6505 | * to sleep. The exception is if we got EBUSY doing |
6506 | * more IO, we should wait for the application to | |
6507 | * reap events and wake us up. | |
6c271ce2 | 6508 | */ |
540e32a0 | 6509 | if (!list_empty(&ctx->iopoll_list) || need_resched() || |
df069d80 JA |
6510 | (!time_after(jiffies, timeout) && ret != -EBUSY && |
6511 | !percpu_ref_is_dying(&ctx->refs))) { | |
4c6e277c | 6512 | io_run_task_work(); |
9831a90c | 6513 | cond_resched(); |
6c271ce2 JA |
6514 | continue; |
6515 | } | |
6516 | ||
6c271ce2 JA |
6517 | prepare_to_wait(&ctx->sqo_wait, &wait, |
6518 | TASK_INTERRUPTIBLE); | |
6519 | ||
bdcd3eab XW |
6520 | /* |
6521 | * While doing polled IO, before going to sleep, we need | |
540e32a0 PB |
6522 | * to check if there are new reqs added to iopoll_list, |
6523 | * it is because reqs may have been punted to io worker | |
6524 | * and will be added to iopoll_list later, hence check | |
6525 | * the iopoll_list again. | |
bdcd3eab XW |
6526 | */ |
6527 | if ((ctx->flags & IORING_SETUP_IOPOLL) && | |
540e32a0 | 6528 | !list_empty_careful(&ctx->iopoll_list)) { |
bdcd3eab XW |
6529 | finish_wait(&ctx->sqo_wait, &wait); |
6530 | continue; | |
6531 | } | |
6532 | ||
23b3628e | 6533 | io_ring_set_wakeup_flag(ctx); |
6c271ce2 | 6534 | |
fb5ccc98 | 6535 | to_submit = io_sqring_entries(ctx); |
c1edbf5f | 6536 | if (!to_submit || ret == -EBUSY) { |
2bbcd6d3 | 6537 | if (kthread_should_park()) { |
6c271ce2 JA |
6538 | finish_wait(&ctx->sqo_wait, &wait); |
6539 | break; | |
6540 | } | |
4c6e277c | 6541 | if (io_run_task_work()) { |
10bea96d | 6542 | finish_wait(&ctx->sqo_wait, &wait); |
23b3628e | 6543 | io_ring_clear_wakeup_flag(ctx); |
b41e9852 JA |
6544 | continue; |
6545 | } | |
6c271ce2 JA |
6546 | if (signal_pending(current)) |
6547 | flush_signals(current); | |
6548 | schedule(); | |
6549 | finish_wait(&ctx->sqo_wait, &wait); | |
6550 | ||
23b3628e | 6551 | io_ring_clear_wakeup_flag(ctx); |
d4ae271d | 6552 | ret = 0; |
6c271ce2 JA |
6553 | continue; |
6554 | } | |
6555 | finish_wait(&ctx->sqo_wait, &wait); | |
6556 | ||
23b3628e | 6557 | io_ring_clear_wakeup_flag(ctx); |
6c271ce2 JA |
6558 | } |
6559 | ||
8a4955ff | 6560 | mutex_lock(&ctx->uring_lock); |
6b668c9b XW |
6561 | if (likely(!percpu_ref_is_dying(&ctx->refs))) |
6562 | ret = io_submit_sqes(ctx, to_submit, NULL, -1); | |
8a4955ff | 6563 | mutex_unlock(&ctx->uring_lock); |
bdcd3eab | 6564 | timeout = jiffies + ctx->sq_thread_idle; |
6c271ce2 JA |
6565 | } |
6566 | ||
4c6e277c | 6567 | io_run_task_work(); |
b41e9852 | 6568 | |
4349f30e | 6569 | io_sq_thread_drop_mm(); |
181e448d | 6570 | revert_creds(old_cred); |
06058632 | 6571 | |
2bbcd6d3 | 6572 | kthread_parkme(); |
06058632 | 6573 | |
6c271ce2 JA |
6574 | return 0; |
6575 | } | |
6576 | ||
bda52162 JA |
6577 | struct io_wait_queue { |
6578 | struct wait_queue_entry wq; | |
6579 | struct io_ring_ctx *ctx; | |
6580 | unsigned to_wait; | |
6581 | unsigned nr_timeouts; | |
6582 | }; | |
6583 | ||
1d7bb1d5 | 6584 | static inline bool io_should_wake(struct io_wait_queue *iowq, bool noflush) |
bda52162 JA |
6585 | { |
6586 | struct io_ring_ctx *ctx = iowq->ctx; | |
6587 | ||
6588 | /* | |
d195a66e | 6589 | * Wake up if we have enough events, or if a timeout occurred since we |
bda52162 JA |
6590 | * started waiting. For timeouts, we always want to return to userspace, |
6591 | * regardless of event count. | |
6592 | */ | |
1d7bb1d5 | 6593 | return io_cqring_events(ctx, noflush) >= iowq->to_wait || |
bda52162 JA |
6594 | atomic_read(&ctx->cq_timeouts) != iowq->nr_timeouts; |
6595 | } | |
6596 | ||
6597 | static int io_wake_function(struct wait_queue_entry *curr, unsigned int mode, | |
6598 | int wake_flags, void *key) | |
6599 | { | |
6600 | struct io_wait_queue *iowq = container_of(curr, struct io_wait_queue, | |
6601 | wq); | |
6602 | ||
1d7bb1d5 JA |
6603 | /* use noflush == true, as we can't safely rely on locking context */ |
6604 | if (!io_should_wake(iowq, true)) | |
bda52162 JA |
6605 | return -1; |
6606 | ||
6607 | return autoremove_wake_function(curr, mode, wake_flags, key); | |
6608 | } | |
6609 | ||
2b188cc1 JA |
6610 | /* |
6611 | * Wait until events become available, if we don't already have some. The | |
6612 | * application must reap them itself, as they reside on the shared cq ring. | |
6613 | */ | |
6614 | static int io_cqring_wait(struct io_ring_ctx *ctx, int min_events, | |
6615 | const sigset_t __user *sig, size_t sigsz) | |
6616 | { | |
bda52162 JA |
6617 | struct io_wait_queue iowq = { |
6618 | .wq = { | |
6619 | .private = current, | |
6620 | .func = io_wake_function, | |
6621 | .entry = LIST_HEAD_INIT(iowq.wq.entry), | |
6622 | }, | |
6623 | .ctx = ctx, | |
6624 | .to_wait = min_events, | |
6625 | }; | |
75b28aff | 6626 | struct io_rings *rings = ctx->rings; |
e9ffa5c2 | 6627 | int ret = 0; |
2b188cc1 | 6628 | |
b41e9852 JA |
6629 | do { |
6630 | if (io_cqring_events(ctx, false) >= min_events) | |
6631 | return 0; | |
4c6e277c | 6632 | if (!io_run_task_work()) |
b41e9852 | 6633 | break; |
b41e9852 | 6634 | } while (1); |
2b188cc1 JA |
6635 | |
6636 | if (sig) { | |
9e75ad5d AB |
6637 | #ifdef CONFIG_COMPAT |
6638 | if (in_compat_syscall()) | |
6639 | ret = set_compat_user_sigmask((const compat_sigset_t __user *)sig, | |
b772434b | 6640 | sigsz); |
9e75ad5d AB |
6641 | else |
6642 | #endif | |
b772434b | 6643 | ret = set_user_sigmask(sig, sigsz); |
9e75ad5d | 6644 | |
2b188cc1 JA |
6645 | if (ret) |
6646 | return ret; | |
6647 | } | |
6648 | ||
bda52162 | 6649 | iowq.nr_timeouts = atomic_read(&ctx->cq_timeouts); |
c826bd7a | 6650 | trace_io_uring_cqring_wait(ctx, min_events); |
bda52162 JA |
6651 | do { |
6652 | prepare_to_wait_exclusive(&ctx->wait, &iowq.wq, | |
6653 | TASK_INTERRUPTIBLE); | |
ce593a6c | 6654 | /* make sure we run task_work before checking for signals */ |
4c6e277c JA |
6655 | if (io_run_task_work()) |
6656 | continue; | |
bda52162 | 6657 | if (signal_pending(current)) { |
b7db41c9 JA |
6658 | if (current->jobctl & JOBCTL_TASK_WORK) { |
6659 | spin_lock_irq(¤t->sighand->siglock); | |
6660 | current->jobctl &= ~JOBCTL_TASK_WORK; | |
6661 | recalc_sigpending(); | |
6662 | spin_unlock_irq(¤t->sighand->siglock); | |
6663 | continue; | |
6664 | } | |
6665 | ret = -EINTR; | |
bda52162 JA |
6666 | break; |
6667 | } | |
ce593a6c JA |
6668 | if (io_should_wake(&iowq, false)) |
6669 | break; | |
6670 | schedule(); | |
bda52162 JA |
6671 | } while (1); |
6672 | finish_wait(&ctx->wait, &iowq.wq); | |
6673 | ||
b7db41c9 | 6674 | restore_saved_sigmask_unless(ret == -EINTR); |
2b188cc1 | 6675 | |
75b28aff | 6676 | return READ_ONCE(rings->cq.head) == READ_ONCE(rings->cq.tail) ? ret : 0; |
2b188cc1 JA |
6677 | } |
6678 | ||
6b06314c JA |
6679 | static void __io_sqe_files_unregister(struct io_ring_ctx *ctx) |
6680 | { | |
6681 | #if defined(CONFIG_UNIX) | |
6682 | if (ctx->ring_sock) { | |
6683 | struct sock *sock = ctx->ring_sock->sk; | |
6684 | struct sk_buff *skb; | |
6685 | ||
6686 | while ((skb = skb_dequeue(&sock->sk_receive_queue)) != NULL) | |
6687 | kfree_skb(skb); | |
6688 | } | |
6689 | #else | |
6690 | int i; | |
6691 | ||
65e19f54 JA |
6692 | for (i = 0; i < ctx->nr_user_files; i++) { |
6693 | struct file *file; | |
6694 | ||
6695 | file = io_file_from_index(ctx, i); | |
6696 | if (file) | |
6697 | fput(file); | |
6698 | } | |
6b06314c JA |
6699 | #endif |
6700 | } | |
6701 | ||
05f3fb3c JA |
6702 | static void io_file_ref_kill(struct percpu_ref *ref) |
6703 | { | |
6704 | struct fixed_file_data *data; | |
6705 | ||
6706 | data = container_of(ref, struct fixed_file_data, refs); | |
6707 | complete(&data->done); | |
6708 | } | |
6709 | ||
6b06314c JA |
6710 | static int io_sqe_files_unregister(struct io_ring_ctx *ctx) |
6711 | { | |
05f3fb3c | 6712 | struct fixed_file_data *data = ctx->file_data; |
05589553 | 6713 | struct fixed_file_ref_node *ref_node = NULL; |
65e19f54 JA |
6714 | unsigned nr_tables, i; |
6715 | ||
05f3fb3c | 6716 | if (!data) |
6b06314c JA |
6717 | return -ENXIO; |
6718 | ||
6a4d07cd | 6719 | spin_lock(&data->lock); |
05589553 XW |
6720 | if (!list_empty(&data->ref_list)) |
6721 | ref_node = list_first_entry(&data->ref_list, | |
6722 | struct fixed_file_ref_node, node); | |
6a4d07cd | 6723 | spin_unlock(&data->lock); |
05589553 XW |
6724 | if (ref_node) |
6725 | percpu_ref_kill(&ref_node->refs); | |
6726 | ||
6727 | percpu_ref_kill(&data->refs); | |
6728 | ||
6729 | /* wait for all refs nodes to complete */ | |
4a38aed2 | 6730 | flush_delayed_work(&ctx->file_put_work); |
2faf852d | 6731 | wait_for_completion(&data->done); |
05f3fb3c | 6732 | |
6b06314c | 6733 | __io_sqe_files_unregister(ctx); |
65e19f54 JA |
6734 | nr_tables = DIV_ROUND_UP(ctx->nr_user_files, IORING_MAX_FILES_TABLE); |
6735 | for (i = 0; i < nr_tables; i++) | |
05f3fb3c JA |
6736 | kfree(data->table[i].files); |
6737 | kfree(data->table); | |
05589553 XW |
6738 | percpu_ref_exit(&data->refs); |
6739 | kfree(data); | |
05f3fb3c | 6740 | ctx->file_data = NULL; |
6b06314c JA |
6741 | ctx->nr_user_files = 0; |
6742 | return 0; | |
6743 | } | |
6744 | ||
6c271ce2 JA |
6745 | static void io_sq_thread_stop(struct io_ring_ctx *ctx) |
6746 | { | |
6747 | if (ctx->sqo_thread) { | |
0f158b4c | 6748 | wait_for_completion(&ctx->sq_thread_comp); |
2bbcd6d3 RP |
6749 | /* |
6750 | * The park is a bit of a work-around, without it we get | |
6751 | * warning spews on shutdown with SQPOLL set and affinity | |
6752 | * set to a single CPU. | |
6753 | */ | |
06058632 | 6754 | kthread_park(ctx->sqo_thread); |
6c271ce2 JA |
6755 | kthread_stop(ctx->sqo_thread); |
6756 | ctx->sqo_thread = NULL; | |
6757 | } | |
6758 | } | |
6759 | ||
6b06314c JA |
6760 | static void io_finish_async(struct io_ring_ctx *ctx) |
6761 | { | |
6c271ce2 JA |
6762 | io_sq_thread_stop(ctx); |
6763 | ||
561fb04a JA |
6764 | if (ctx->io_wq) { |
6765 | io_wq_destroy(ctx->io_wq); | |
6766 | ctx->io_wq = NULL; | |
6b06314c JA |
6767 | } |
6768 | } | |
6769 | ||
6770 | #if defined(CONFIG_UNIX) | |
6b06314c JA |
6771 | /* |
6772 | * Ensure the UNIX gc is aware of our file set, so we are certain that | |
6773 | * the io_uring can be safely unregistered on process exit, even if we have | |
6774 | * loops in the file referencing. | |
6775 | */ | |
6776 | static int __io_sqe_files_scm(struct io_ring_ctx *ctx, int nr, int offset) | |
6777 | { | |
6778 | struct sock *sk = ctx->ring_sock->sk; | |
6779 | struct scm_fp_list *fpl; | |
6780 | struct sk_buff *skb; | |
08a45173 | 6781 | int i, nr_files; |
6b06314c | 6782 | |
6b06314c JA |
6783 | fpl = kzalloc(sizeof(*fpl), GFP_KERNEL); |
6784 | if (!fpl) | |
6785 | return -ENOMEM; | |
6786 | ||
6787 | skb = alloc_skb(0, GFP_KERNEL); | |
6788 | if (!skb) { | |
6789 | kfree(fpl); | |
6790 | return -ENOMEM; | |
6791 | } | |
6792 | ||
6793 | skb->sk = sk; | |
6b06314c | 6794 | |
08a45173 | 6795 | nr_files = 0; |
6b06314c JA |
6796 | fpl->user = get_uid(ctx->user); |
6797 | for (i = 0; i < nr; i++) { | |
65e19f54 JA |
6798 | struct file *file = io_file_from_index(ctx, i + offset); |
6799 | ||
6800 | if (!file) | |
08a45173 | 6801 | continue; |
65e19f54 | 6802 | fpl->fp[nr_files] = get_file(file); |
08a45173 JA |
6803 | unix_inflight(fpl->user, fpl->fp[nr_files]); |
6804 | nr_files++; | |
6b06314c JA |
6805 | } |
6806 | ||
08a45173 JA |
6807 | if (nr_files) { |
6808 | fpl->max = SCM_MAX_FD; | |
6809 | fpl->count = nr_files; | |
6810 | UNIXCB(skb).fp = fpl; | |
05f3fb3c | 6811 | skb->destructor = unix_destruct_scm; |
08a45173 JA |
6812 | refcount_add(skb->truesize, &sk->sk_wmem_alloc); |
6813 | skb_queue_head(&sk->sk_receive_queue, skb); | |
6b06314c | 6814 | |
08a45173 JA |
6815 | for (i = 0; i < nr_files; i++) |
6816 | fput(fpl->fp[i]); | |
6817 | } else { | |
6818 | kfree_skb(skb); | |
6819 | kfree(fpl); | |
6820 | } | |
6b06314c JA |
6821 | |
6822 | return 0; | |
6823 | } | |
6824 | ||
6825 | /* | |
6826 | * If UNIX sockets are enabled, fd passing can cause a reference cycle which | |
6827 | * causes regular reference counting to break down. We rely on the UNIX | |
6828 | * garbage collection to take care of this problem for us. | |
6829 | */ | |
6830 | static int io_sqe_files_scm(struct io_ring_ctx *ctx) | |
6831 | { | |
6832 | unsigned left, total; | |
6833 | int ret = 0; | |
6834 | ||
6835 | total = 0; | |
6836 | left = ctx->nr_user_files; | |
6837 | while (left) { | |
6838 | unsigned this_files = min_t(unsigned, left, SCM_MAX_FD); | |
6b06314c JA |
6839 | |
6840 | ret = __io_sqe_files_scm(ctx, this_files, total); | |
6841 | if (ret) | |
6842 | break; | |
6843 | left -= this_files; | |
6844 | total += this_files; | |
6845 | } | |
6846 | ||
6847 | if (!ret) | |
6848 | return 0; | |
6849 | ||
6850 | while (total < ctx->nr_user_files) { | |
65e19f54 JA |
6851 | struct file *file = io_file_from_index(ctx, total); |
6852 | ||
6853 | if (file) | |
6854 | fput(file); | |
6b06314c JA |
6855 | total++; |
6856 | } | |
6857 | ||
6858 | return ret; | |
6859 | } | |
6860 | #else | |
6861 | static int io_sqe_files_scm(struct io_ring_ctx *ctx) | |
6862 | { | |
6863 | return 0; | |
6864 | } | |
6865 | #endif | |
6866 | ||
65e19f54 JA |
6867 | static int io_sqe_alloc_file_tables(struct io_ring_ctx *ctx, unsigned nr_tables, |
6868 | unsigned nr_files) | |
6869 | { | |
6870 | int i; | |
6871 | ||
6872 | for (i = 0; i < nr_tables; i++) { | |
05f3fb3c | 6873 | struct fixed_file_table *table = &ctx->file_data->table[i]; |
65e19f54 JA |
6874 | unsigned this_files; |
6875 | ||
6876 | this_files = min(nr_files, IORING_MAX_FILES_TABLE); | |
6877 | table->files = kcalloc(this_files, sizeof(struct file *), | |
6878 | GFP_KERNEL); | |
6879 | if (!table->files) | |
6880 | break; | |
6881 | nr_files -= this_files; | |
6882 | } | |
6883 | ||
6884 | if (i == nr_tables) | |
6885 | return 0; | |
6886 | ||
6887 | for (i = 0; i < nr_tables; i++) { | |
05f3fb3c | 6888 | struct fixed_file_table *table = &ctx->file_data->table[i]; |
65e19f54 JA |
6889 | kfree(table->files); |
6890 | } | |
6891 | return 1; | |
6892 | } | |
6893 | ||
05f3fb3c JA |
6894 | static void io_ring_file_put(struct io_ring_ctx *ctx, struct file *file) |
6895 | { | |
6896 | #if defined(CONFIG_UNIX) | |
6897 | struct sock *sock = ctx->ring_sock->sk; | |
6898 | struct sk_buff_head list, *head = &sock->sk_receive_queue; | |
6899 | struct sk_buff *skb; | |
6900 | int i; | |
6901 | ||
6902 | __skb_queue_head_init(&list); | |
6903 | ||
6904 | /* | |
6905 | * Find the skb that holds this file in its SCM_RIGHTS. When found, | |
6906 | * remove this entry and rearrange the file array. | |
6907 | */ | |
6908 | skb = skb_dequeue(head); | |
6909 | while (skb) { | |
6910 | struct scm_fp_list *fp; | |
6911 | ||
6912 | fp = UNIXCB(skb).fp; | |
6913 | for (i = 0; i < fp->count; i++) { | |
6914 | int left; | |
6915 | ||
6916 | if (fp->fp[i] != file) | |
6917 | continue; | |
6918 | ||
6919 | unix_notinflight(fp->user, fp->fp[i]); | |
6920 | left = fp->count - 1 - i; | |
6921 | if (left) { | |
6922 | memmove(&fp->fp[i], &fp->fp[i + 1], | |
6923 | left * sizeof(struct file *)); | |
6924 | } | |
6925 | fp->count--; | |
6926 | if (!fp->count) { | |
6927 | kfree_skb(skb); | |
6928 | skb = NULL; | |
6929 | } else { | |
6930 | __skb_queue_tail(&list, skb); | |
6931 | } | |
6932 | fput(file); | |
6933 | file = NULL; | |
6934 | break; | |
6935 | } | |
6936 | ||
6937 | if (!file) | |
6938 | break; | |
6939 | ||
6940 | __skb_queue_tail(&list, skb); | |
6941 | ||
6942 | skb = skb_dequeue(head); | |
6943 | } | |
6944 | ||
6945 | if (skb_peek(&list)) { | |
6946 | spin_lock_irq(&head->lock); | |
6947 | while ((skb = __skb_dequeue(&list)) != NULL) | |
6948 | __skb_queue_tail(head, skb); | |
6949 | spin_unlock_irq(&head->lock); | |
6950 | } | |
6951 | #else | |
6952 | fput(file); | |
6953 | #endif | |
6954 | } | |
6955 | ||
6956 | struct io_file_put { | |
05589553 | 6957 | struct list_head list; |
05f3fb3c | 6958 | struct file *file; |
05f3fb3c JA |
6959 | }; |
6960 | ||
4a38aed2 | 6961 | static void __io_file_put_work(struct fixed_file_ref_node *ref_node) |
65e19f54 | 6962 | { |
4a38aed2 JA |
6963 | struct fixed_file_data *file_data = ref_node->file_data; |
6964 | struct io_ring_ctx *ctx = file_data->ctx; | |
05f3fb3c | 6965 | struct io_file_put *pfile, *tmp; |
05589553 XW |
6966 | |
6967 | list_for_each_entry_safe(pfile, tmp, &ref_node->file_list, list) { | |
6a4d07cd | 6968 | list_del(&pfile->list); |
05589553 XW |
6969 | io_ring_file_put(ctx, pfile->file); |
6970 | kfree(pfile); | |
65e19f54 | 6971 | } |
05589553 | 6972 | |
6a4d07cd JA |
6973 | spin_lock(&file_data->lock); |
6974 | list_del(&ref_node->node); | |
6975 | spin_unlock(&file_data->lock); | |
05589553 XW |
6976 | |
6977 | percpu_ref_exit(&ref_node->refs); | |
6978 | kfree(ref_node); | |
6979 | percpu_ref_put(&file_data->refs); | |
2faf852d | 6980 | } |
65e19f54 | 6981 | |
4a38aed2 JA |
6982 | static void io_file_put_work(struct work_struct *work) |
6983 | { | |
6984 | struct io_ring_ctx *ctx; | |
6985 | struct llist_node *node; | |
6986 | ||
6987 | ctx = container_of(work, struct io_ring_ctx, file_put_work.work); | |
6988 | node = llist_del_all(&ctx->file_put_llist); | |
6989 | ||
6990 | while (node) { | |
6991 | struct fixed_file_ref_node *ref_node; | |
6992 | struct llist_node *next = node->next; | |
6993 | ||
6994 | ref_node = llist_entry(node, struct fixed_file_ref_node, llist); | |
6995 | __io_file_put_work(ref_node); | |
6996 | node = next; | |
6997 | } | |
6998 | } | |
6999 | ||
05589553 | 7000 | static void io_file_data_ref_zero(struct percpu_ref *ref) |
2faf852d | 7001 | { |
05589553 | 7002 | struct fixed_file_ref_node *ref_node; |
4a38aed2 JA |
7003 | struct io_ring_ctx *ctx; |
7004 | bool first_add; | |
7005 | int delay = HZ; | |
65e19f54 | 7006 | |
05589553 | 7007 | ref_node = container_of(ref, struct fixed_file_ref_node, refs); |
4a38aed2 | 7008 | ctx = ref_node->file_data->ctx; |
05589553 | 7009 | |
4a38aed2 JA |
7010 | if (percpu_ref_is_dying(&ctx->file_data->refs)) |
7011 | delay = 0; | |
05589553 | 7012 | |
4a38aed2 JA |
7013 | first_add = llist_add(&ref_node->llist, &ctx->file_put_llist); |
7014 | if (!delay) | |
7015 | mod_delayed_work(system_wq, &ctx->file_put_work, 0); | |
7016 | else if (first_add) | |
7017 | queue_delayed_work(system_wq, &ctx->file_put_work, delay); | |
05f3fb3c | 7018 | } |
65e19f54 | 7019 | |
05589553 XW |
7020 | static struct fixed_file_ref_node *alloc_fixed_file_ref_node( |
7021 | struct io_ring_ctx *ctx) | |
05f3fb3c | 7022 | { |
05589553 | 7023 | struct fixed_file_ref_node *ref_node; |
05f3fb3c | 7024 | |
05589553 XW |
7025 | ref_node = kzalloc(sizeof(*ref_node), GFP_KERNEL); |
7026 | if (!ref_node) | |
7027 | return ERR_PTR(-ENOMEM); | |
05f3fb3c | 7028 | |
05589553 XW |
7029 | if (percpu_ref_init(&ref_node->refs, io_file_data_ref_zero, |
7030 | 0, GFP_KERNEL)) { | |
7031 | kfree(ref_node); | |
7032 | return ERR_PTR(-ENOMEM); | |
7033 | } | |
7034 | INIT_LIST_HEAD(&ref_node->node); | |
7035 | INIT_LIST_HEAD(&ref_node->file_list); | |
05589553 XW |
7036 | ref_node->file_data = ctx->file_data; |
7037 | return ref_node; | |
05589553 XW |
7038 | } |
7039 | ||
7040 | static void destroy_fixed_file_ref_node(struct fixed_file_ref_node *ref_node) | |
7041 | { | |
7042 | percpu_ref_exit(&ref_node->refs); | |
7043 | kfree(ref_node); | |
65e19f54 JA |
7044 | } |
7045 | ||
6b06314c JA |
7046 | static int io_sqe_files_register(struct io_ring_ctx *ctx, void __user *arg, |
7047 | unsigned nr_args) | |
7048 | { | |
7049 | __s32 __user *fds = (__s32 __user *) arg; | |
65e19f54 | 7050 | unsigned nr_tables; |
05f3fb3c | 7051 | struct file *file; |
6b06314c JA |
7052 | int fd, ret = 0; |
7053 | unsigned i; | |
05589553 | 7054 | struct fixed_file_ref_node *ref_node; |
6b06314c | 7055 | |
05f3fb3c | 7056 | if (ctx->file_data) |
6b06314c JA |
7057 | return -EBUSY; |
7058 | if (!nr_args) | |
7059 | return -EINVAL; | |
7060 | if (nr_args > IORING_MAX_FIXED_FILES) | |
7061 | return -EMFILE; | |
7062 | ||
05f3fb3c JA |
7063 | ctx->file_data = kzalloc(sizeof(*ctx->file_data), GFP_KERNEL); |
7064 | if (!ctx->file_data) | |
7065 | return -ENOMEM; | |
7066 | ctx->file_data->ctx = ctx; | |
7067 | init_completion(&ctx->file_data->done); | |
05589553 | 7068 | INIT_LIST_HEAD(&ctx->file_data->ref_list); |
f7fe9346 | 7069 | spin_lock_init(&ctx->file_data->lock); |
05f3fb3c | 7070 | |
65e19f54 | 7071 | nr_tables = DIV_ROUND_UP(nr_args, IORING_MAX_FILES_TABLE); |
05f3fb3c JA |
7072 | ctx->file_data->table = kcalloc(nr_tables, |
7073 | sizeof(struct fixed_file_table), | |
65e19f54 | 7074 | GFP_KERNEL); |
05f3fb3c JA |
7075 | if (!ctx->file_data->table) { |
7076 | kfree(ctx->file_data); | |
7077 | ctx->file_data = NULL; | |
6b06314c | 7078 | return -ENOMEM; |
05f3fb3c JA |
7079 | } |
7080 | ||
05589553 | 7081 | if (percpu_ref_init(&ctx->file_data->refs, io_file_ref_kill, |
05f3fb3c JA |
7082 | PERCPU_REF_ALLOW_REINIT, GFP_KERNEL)) { |
7083 | kfree(ctx->file_data->table); | |
7084 | kfree(ctx->file_data); | |
7085 | ctx->file_data = NULL; | |
6b06314c | 7086 | return -ENOMEM; |
05f3fb3c | 7087 | } |
6b06314c | 7088 | |
65e19f54 | 7089 | if (io_sqe_alloc_file_tables(ctx, nr_tables, nr_args)) { |
05f3fb3c JA |
7090 | percpu_ref_exit(&ctx->file_data->refs); |
7091 | kfree(ctx->file_data->table); | |
7092 | kfree(ctx->file_data); | |
7093 | ctx->file_data = NULL; | |
65e19f54 JA |
7094 | return -ENOMEM; |
7095 | } | |
7096 | ||
08a45173 | 7097 | for (i = 0; i < nr_args; i++, ctx->nr_user_files++) { |
65e19f54 JA |
7098 | struct fixed_file_table *table; |
7099 | unsigned index; | |
7100 | ||
6b06314c JA |
7101 | ret = -EFAULT; |
7102 | if (copy_from_user(&fd, &fds[i], sizeof(fd))) | |
7103 | break; | |
08a45173 JA |
7104 | /* allow sparse sets */ |
7105 | if (fd == -1) { | |
7106 | ret = 0; | |
7107 | continue; | |
7108 | } | |
6b06314c | 7109 | |
05f3fb3c | 7110 | table = &ctx->file_data->table[i >> IORING_FILE_TABLE_SHIFT]; |
65e19f54 | 7111 | index = i & IORING_FILE_TABLE_MASK; |
05f3fb3c | 7112 | file = fget(fd); |
6b06314c JA |
7113 | |
7114 | ret = -EBADF; | |
05f3fb3c | 7115 | if (!file) |
6b06314c | 7116 | break; |
05f3fb3c | 7117 | |
6b06314c JA |
7118 | /* |
7119 | * Don't allow io_uring instances to be registered. If UNIX | |
7120 | * isn't enabled, then this causes a reference cycle and this | |
7121 | * instance can never get freed. If UNIX is enabled we'll | |
7122 | * handle it just fine, but there's still no point in allowing | |
7123 | * a ring fd as it doesn't support regular read/write anyway. | |
7124 | */ | |
05f3fb3c JA |
7125 | if (file->f_op == &io_uring_fops) { |
7126 | fput(file); | |
6b06314c JA |
7127 | break; |
7128 | } | |
6b06314c | 7129 | ret = 0; |
05f3fb3c | 7130 | table->files[index] = file; |
6b06314c JA |
7131 | } |
7132 | ||
7133 | if (ret) { | |
65e19f54 | 7134 | for (i = 0; i < ctx->nr_user_files; i++) { |
65e19f54 JA |
7135 | file = io_file_from_index(ctx, i); |
7136 | if (file) | |
7137 | fput(file); | |
7138 | } | |
7139 | for (i = 0; i < nr_tables; i++) | |
05f3fb3c | 7140 | kfree(ctx->file_data->table[i].files); |
6b06314c | 7141 | |
667e57da | 7142 | percpu_ref_exit(&ctx->file_data->refs); |
05f3fb3c JA |
7143 | kfree(ctx->file_data->table); |
7144 | kfree(ctx->file_data); | |
7145 | ctx->file_data = NULL; | |
6b06314c JA |
7146 | ctx->nr_user_files = 0; |
7147 | return ret; | |
7148 | } | |
7149 | ||
7150 | ret = io_sqe_files_scm(ctx); | |
05589553 | 7151 | if (ret) { |
6b06314c | 7152 | io_sqe_files_unregister(ctx); |
05589553 XW |
7153 | return ret; |
7154 | } | |
6b06314c | 7155 | |
05589553 XW |
7156 | ref_node = alloc_fixed_file_ref_node(ctx); |
7157 | if (IS_ERR(ref_node)) { | |
7158 | io_sqe_files_unregister(ctx); | |
7159 | return PTR_ERR(ref_node); | |
7160 | } | |
7161 | ||
7162 | ctx->file_data->cur_refs = &ref_node->refs; | |
6a4d07cd | 7163 | spin_lock(&ctx->file_data->lock); |
05589553 | 7164 | list_add(&ref_node->node, &ctx->file_data->ref_list); |
6a4d07cd | 7165 | spin_unlock(&ctx->file_data->lock); |
05589553 | 7166 | percpu_ref_get(&ctx->file_data->refs); |
6b06314c JA |
7167 | return ret; |
7168 | } | |
7169 | ||
c3a31e60 JA |
7170 | static int io_sqe_file_register(struct io_ring_ctx *ctx, struct file *file, |
7171 | int index) | |
7172 | { | |
7173 | #if defined(CONFIG_UNIX) | |
7174 | struct sock *sock = ctx->ring_sock->sk; | |
7175 | struct sk_buff_head *head = &sock->sk_receive_queue; | |
7176 | struct sk_buff *skb; | |
7177 | ||
7178 | /* | |
7179 | * See if we can merge this file into an existing skb SCM_RIGHTS | |
7180 | * file set. If there's no room, fall back to allocating a new skb | |
7181 | * and filling it in. | |
7182 | */ | |
7183 | spin_lock_irq(&head->lock); | |
7184 | skb = skb_peek(head); | |
7185 | if (skb) { | |
7186 | struct scm_fp_list *fpl = UNIXCB(skb).fp; | |
7187 | ||
7188 | if (fpl->count < SCM_MAX_FD) { | |
7189 | __skb_unlink(skb, head); | |
7190 | spin_unlock_irq(&head->lock); | |
7191 | fpl->fp[fpl->count] = get_file(file); | |
7192 | unix_inflight(fpl->user, fpl->fp[fpl->count]); | |
7193 | fpl->count++; | |
7194 | spin_lock_irq(&head->lock); | |
7195 | __skb_queue_head(head, skb); | |
7196 | } else { | |
7197 | skb = NULL; | |
7198 | } | |
7199 | } | |
7200 | spin_unlock_irq(&head->lock); | |
7201 | ||
7202 | if (skb) { | |
7203 | fput(file); | |
7204 | return 0; | |
7205 | } | |
7206 | ||
7207 | return __io_sqe_files_scm(ctx, 1, index); | |
7208 | #else | |
7209 | return 0; | |
7210 | #endif | |
7211 | } | |
7212 | ||
a5318d3c | 7213 | static int io_queue_file_removal(struct fixed_file_data *data, |
05589553 | 7214 | struct file *file) |
05f3fb3c | 7215 | { |
a5318d3c | 7216 | struct io_file_put *pfile; |
05589553 XW |
7217 | struct percpu_ref *refs = data->cur_refs; |
7218 | struct fixed_file_ref_node *ref_node; | |
05f3fb3c | 7219 | |
05f3fb3c | 7220 | pfile = kzalloc(sizeof(*pfile), GFP_KERNEL); |
a5318d3c HD |
7221 | if (!pfile) |
7222 | return -ENOMEM; | |
05f3fb3c | 7223 | |
05589553 | 7224 | ref_node = container_of(refs, struct fixed_file_ref_node, refs); |
05f3fb3c | 7225 | pfile->file = file; |
05589553 XW |
7226 | list_add(&pfile->list, &ref_node->file_list); |
7227 | ||
a5318d3c | 7228 | return 0; |
05f3fb3c JA |
7229 | } |
7230 | ||
7231 | static int __io_sqe_files_update(struct io_ring_ctx *ctx, | |
7232 | struct io_uring_files_update *up, | |
7233 | unsigned nr_args) | |
7234 | { | |
7235 | struct fixed_file_data *data = ctx->file_data; | |
05589553 | 7236 | struct fixed_file_ref_node *ref_node; |
05f3fb3c | 7237 | struct file *file; |
c3a31e60 JA |
7238 | __s32 __user *fds; |
7239 | int fd, i, err; | |
7240 | __u32 done; | |
05589553 | 7241 | bool needs_switch = false; |
c3a31e60 | 7242 | |
05f3fb3c | 7243 | if (check_add_overflow(up->offset, nr_args, &done)) |
c3a31e60 JA |
7244 | return -EOVERFLOW; |
7245 | if (done > ctx->nr_user_files) | |
7246 | return -EINVAL; | |
7247 | ||
05589553 XW |
7248 | ref_node = alloc_fixed_file_ref_node(ctx); |
7249 | if (IS_ERR(ref_node)) | |
7250 | return PTR_ERR(ref_node); | |
7251 | ||
c3a31e60 | 7252 | done = 0; |
05f3fb3c | 7253 | fds = u64_to_user_ptr(up->fds); |
c3a31e60 | 7254 | while (nr_args) { |
65e19f54 JA |
7255 | struct fixed_file_table *table; |
7256 | unsigned index; | |
7257 | ||
c3a31e60 JA |
7258 | err = 0; |
7259 | if (copy_from_user(&fd, &fds[done], sizeof(fd))) { | |
7260 | err = -EFAULT; | |
7261 | break; | |
7262 | } | |
05f3fb3c JA |
7263 | i = array_index_nospec(up->offset, ctx->nr_user_files); |
7264 | table = &ctx->file_data->table[i >> IORING_FILE_TABLE_SHIFT]; | |
65e19f54 JA |
7265 | index = i & IORING_FILE_TABLE_MASK; |
7266 | if (table->files[index]) { | |
05f3fb3c | 7267 | file = io_file_from_index(ctx, index); |
a5318d3c HD |
7268 | err = io_queue_file_removal(data, file); |
7269 | if (err) | |
7270 | break; | |
65e19f54 | 7271 | table->files[index] = NULL; |
05589553 | 7272 | needs_switch = true; |
c3a31e60 JA |
7273 | } |
7274 | if (fd != -1) { | |
c3a31e60 JA |
7275 | file = fget(fd); |
7276 | if (!file) { | |
7277 | err = -EBADF; | |
7278 | break; | |
7279 | } | |
7280 | /* | |
7281 | * Don't allow io_uring instances to be registered. If | |
7282 | * UNIX isn't enabled, then this causes a reference | |
7283 | * cycle and this instance can never get freed. If UNIX | |
7284 | * is enabled we'll handle it just fine, but there's | |
7285 | * still no point in allowing a ring fd as it doesn't | |
7286 | * support regular read/write anyway. | |
7287 | */ | |
7288 | if (file->f_op == &io_uring_fops) { | |
7289 | fput(file); | |
7290 | err = -EBADF; | |
7291 | break; | |
7292 | } | |
65e19f54 | 7293 | table->files[index] = file; |
c3a31e60 | 7294 | err = io_sqe_file_register(ctx, file, i); |
f3bd9dae YY |
7295 | if (err) { |
7296 | fput(file); | |
c3a31e60 | 7297 | break; |
f3bd9dae | 7298 | } |
c3a31e60 JA |
7299 | } |
7300 | nr_args--; | |
7301 | done++; | |
05f3fb3c JA |
7302 | up->offset++; |
7303 | } | |
7304 | ||
05589553 XW |
7305 | if (needs_switch) { |
7306 | percpu_ref_kill(data->cur_refs); | |
6a4d07cd | 7307 | spin_lock(&data->lock); |
05589553 XW |
7308 | list_add(&ref_node->node, &data->ref_list); |
7309 | data->cur_refs = &ref_node->refs; | |
6a4d07cd | 7310 | spin_unlock(&data->lock); |
05589553 XW |
7311 | percpu_ref_get(&ctx->file_data->refs); |
7312 | } else | |
7313 | destroy_fixed_file_ref_node(ref_node); | |
c3a31e60 JA |
7314 | |
7315 | return done ? done : err; | |
7316 | } | |
05589553 | 7317 | |
05f3fb3c JA |
7318 | static int io_sqe_files_update(struct io_ring_ctx *ctx, void __user *arg, |
7319 | unsigned nr_args) | |
7320 | { | |
7321 | struct io_uring_files_update up; | |
7322 | ||
7323 | if (!ctx->file_data) | |
7324 | return -ENXIO; | |
7325 | if (!nr_args) | |
7326 | return -EINVAL; | |
7327 | if (copy_from_user(&up, arg, sizeof(up))) | |
7328 | return -EFAULT; | |
7329 | if (up.resv) | |
7330 | return -EINVAL; | |
7331 | ||
7332 | return __io_sqe_files_update(ctx, &up, nr_args); | |
7333 | } | |
c3a31e60 | 7334 | |
e9fd9396 | 7335 | static void io_free_work(struct io_wq_work *work) |
7d723065 JA |
7336 | { |
7337 | struct io_kiocb *req = container_of(work, struct io_kiocb, work); | |
7338 | ||
e9fd9396 | 7339 | /* Consider that io_steal_work() relies on this ref */ |
7d723065 JA |
7340 | io_put_req(req); |
7341 | } | |
7342 | ||
24369c2e PB |
7343 | static int io_init_wq_offload(struct io_ring_ctx *ctx, |
7344 | struct io_uring_params *p) | |
7345 | { | |
7346 | struct io_wq_data data; | |
7347 | struct fd f; | |
7348 | struct io_ring_ctx *ctx_attach; | |
7349 | unsigned int concurrency; | |
7350 | int ret = 0; | |
7351 | ||
7352 | data.user = ctx->user; | |
e9fd9396 | 7353 | data.free_work = io_free_work; |
f5fa38c5 | 7354 | data.do_work = io_wq_submit_work; |
24369c2e PB |
7355 | |
7356 | if (!(p->flags & IORING_SETUP_ATTACH_WQ)) { | |
7357 | /* Do QD, or 4 * CPUS, whatever is smallest */ | |
7358 | concurrency = min(ctx->sq_entries, 4 * num_online_cpus()); | |
7359 | ||
7360 | ctx->io_wq = io_wq_create(concurrency, &data); | |
7361 | if (IS_ERR(ctx->io_wq)) { | |
7362 | ret = PTR_ERR(ctx->io_wq); | |
7363 | ctx->io_wq = NULL; | |
7364 | } | |
7365 | return ret; | |
7366 | } | |
7367 | ||
7368 | f = fdget(p->wq_fd); | |
7369 | if (!f.file) | |
7370 | return -EBADF; | |
7371 | ||
7372 | if (f.file->f_op != &io_uring_fops) { | |
7373 | ret = -EINVAL; | |
7374 | goto out_fput; | |
7375 | } | |
7376 | ||
7377 | ctx_attach = f.file->private_data; | |
7378 | /* @io_wq is protected by holding the fd */ | |
7379 | if (!io_wq_get(ctx_attach->io_wq, &data)) { | |
7380 | ret = -EINVAL; | |
7381 | goto out_fput; | |
7382 | } | |
7383 | ||
7384 | ctx->io_wq = ctx_attach->io_wq; | |
7385 | out_fput: | |
7386 | fdput(f); | |
7387 | return ret; | |
7388 | } | |
7389 | ||
6c271ce2 JA |
7390 | static int io_sq_offload_start(struct io_ring_ctx *ctx, |
7391 | struct io_uring_params *p) | |
2b188cc1 JA |
7392 | { |
7393 | int ret; | |
7394 | ||
7395 | mmgrab(current->mm); | |
7396 | ctx->sqo_mm = current->mm; | |
7397 | ||
6c271ce2 | 7398 | if (ctx->flags & IORING_SETUP_SQPOLL) { |
3ec482d1 JA |
7399 | ret = -EPERM; |
7400 | if (!capable(CAP_SYS_ADMIN)) | |
7401 | goto err; | |
7402 | ||
917257da JA |
7403 | ctx->sq_thread_idle = msecs_to_jiffies(p->sq_thread_idle); |
7404 | if (!ctx->sq_thread_idle) | |
7405 | ctx->sq_thread_idle = HZ; | |
7406 | ||
6c271ce2 | 7407 | if (p->flags & IORING_SETUP_SQ_AFF) { |
44a9bd18 | 7408 | int cpu = p->sq_thread_cpu; |
6c271ce2 | 7409 | |
917257da | 7410 | ret = -EINVAL; |
44a9bd18 JA |
7411 | if (cpu >= nr_cpu_ids) |
7412 | goto err; | |
7889f44d | 7413 | if (!cpu_online(cpu)) |
917257da JA |
7414 | goto err; |
7415 | ||
6c271ce2 JA |
7416 | ctx->sqo_thread = kthread_create_on_cpu(io_sq_thread, |
7417 | ctx, cpu, | |
7418 | "io_uring-sq"); | |
7419 | } else { | |
7420 | ctx->sqo_thread = kthread_create(io_sq_thread, ctx, | |
7421 | "io_uring-sq"); | |
7422 | } | |
7423 | if (IS_ERR(ctx->sqo_thread)) { | |
7424 | ret = PTR_ERR(ctx->sqo_thread); | |
7425 | ctx->sqo_thread = NULL; | |
7426 | goto err; | |
7427 | } | |
7428 | wake_up_process(ctx->sqo_thread); | |
7429 | } else if (p->flags & IORING_SETUP_SQ_AFF) { | |
7430 | /* Can't have SQ_AFF without SQPOLL */ | |
7431 | ret = -EINVAL; | |
7432 | goto err; | |
7433 | } | |
7434 | ||
24369c2e PB |
7435 | ret = io_init_wq_offload(ctx, p); |
7436 | if (ret) | |
2b188cc1 | 7437 | goto err; |
2b188cc1 JA |
7438 | |
7439 | return 0; | |
7440 | err: | |
54a91f3b | 7441 | io_finish_async(ctx); |
8eb06d7e PB |
7442 | if (ctx->sqo_mm) { |
7443 | mmdrop(ctx->sqo_mm); | |
7444 | ctx->sqo_mm = NULL; | |
7445 | } | |
2b188cc1 JA |
7446 | return ret; |
7447 | } | |
7448 | ||
a087e2b5 BM |
7449 | static inline void __io_unaccount_mem(struct user_struct *user, |
7450 | unsigned long nr_pages) | |
2b188cc1 JA |
7451 | { |
7452 | atomic_long_sub(nr_pages, &user->locked_vm); | |
7453 | } | |
7454 | ||
a087e2b5 BM |
7455 | static inline int __io_account_mem(struct user_struct *user, |
7456 | unsigned long nr_pages) | |
2b188cc1 JA |
7457 | { |
7458 | unsigned long page_limit, cur_pages, new_pages; | |
7459 | ||
7460 | /* Don't allow more pages than we can safely lock */ | |
7461 | page_limit = rlimit(RLIMIT_MEMLOCK) >> PAGE_SHIFT; | |
7462 | ||
7463 | do { | |
7464 | cur_pages = atomic_long_read(&user->locked_vm); | |
7465 | new_pages = cur_pages + nr_pages; | |
7466 | if (new_pages > page_limit) | |
7467 | return -ENOMEM; | |
7468 | } while (atomic_long_cmpxchg(&user->locked_vm, cur_pages, | |
7469 | new_pages) != cur_pages); | |
7470 | ||
7471 | return 0; | |
7472 | } | |
7473 | ||
2e0464d4 BM |
7474 | static void io_unaccount_mem(struct io_ring_ctx *ctx, unsigned long nr_pages, |
7475 | enum io_mem_account acct) | |
a087e2b5 | 7476 | { |
aad5d8da | 7477 | if (ctx->limit_mem) |
a087e2b5 | 7478 | __io_unaccount_mem(ctx->user, nr_pages); |
30975825 | 7479 | |
2e0464d4 BM |
7480 | if (ctx->sqo_mm) { |
7481 | if (acct == ACCT_LOCKED) | |
7482 | ctx->sqo_mm->locked_vm -= nr_pages; | |
7483 | else if (acct == ACCT_PINNED) | |
7484 | atomic64_sub(nr_pages, &ctx->sqo_mm->pinned_vm); | |
7485 | } | |
a087e2b5 BM |
7486 | } |
7487 | ||
2e0464d4 BM |
7488 | static int io_account_mem(struct io_ring_ctx *ctx, unsigned long nr_pages, |
7489 | enum io_mem_account acct) | |
a087e2b5 | 7490 | { |
30975825 BM |
7491 | int ret; |
7492 | ||
7493 | if (ctx->limit_mem) { | |
7494 | ret = __io_account_mem(ctx->user, nr_pages); | |
7495 | if (ret) | |
7496 | return ret; | |
7497 | } | |
7498 | ||
2e0464d4 BM |
7499 | if (ctx->sqo_mm) { |
7500 | if (acct == ACCT_LOCKED) | |
7501 | ctx->sqo_mm->locked_vm += nr_pages; | |
7502 | else if (acct == ACCT_PINNED) | |
7503 | atomic64_add(nr_pages, &ctx->sqo_mm->pinned_vm); | |
7504 | } | |
a087e2b5 BM |
7505 | |
7506 | return 0; | |
7507 | } | |
7508 | ||
2b188cc1 JA |
7509 | static void io_mem_free(void *ptr) |
7510 | { | |
52e04ef4 MR |
7511 | struct page *page; |
7512 | ||
7513 | if (!ptr) | |
7514 | return; | |
2b188cc1 | 7515 | |
52e04ef4 | 7516 | page = virt_to_head_page(ptr); |
2b188cc1 JA |
7517 | if (put_page_testzero(page)) |
7518 | free_compound_page(page); | |
7519 | } | |
7520 | ||
7521 | static void *io_mem_alloc(size_t size) | |
7522 | { | |
7523 | gfp_t gfp_flags = GFP_KERNEL | __GFP_ZERO | __GFP_NOWARN | __GFP_COMP | | |
7524 | __GFP_NORETRY; | |
7525 | ||
7526 | return (void *) __get_free_pages(gfp_flags, get_order(size)); | |
7527 | } | |
7528 | ||
75b28aff HV |
7529 | static unsigned long rings_size(unsigned sq_entries, unsigned cq_entries, |
7530 | size_t *sq_offset) | |
7531 | { | |
7532 | struct io_rings *rings; | |
7533 | size_t off, sq_array_size; | |
7534 | ||
7535 | off = struct_size(rings, cqes, cq_entries); | |
7536 | if (off == SIZE_MAX) | |
7537 | return SIZE_MAX; | |
7538 | ||
7539 | #ifdef CONFIG_SMP | |
7540 | off = ALIGN(off, SMP_CACHE_BYTES); | |
7541 | if (off == 0) | |
7542 | return SIZE_MAX; | |
7543 | #endif | |
7544 | ||
b36200f5 DV |
7545 | if (sq_offset) |
7546 | *sq_offset = off; | |
7547 | ||
75b28aff HV |
7548 | sq_array_size = array_size(sizeof(u32), sq_entries); |
7549 | if (sq_array_size == SIZE_MAX) | |
7550 | return SIZE_MAX; | |
7551 | ||
7552 | if (check_add_overflow(off, sq_array_size, &off)) | |
7553 | return SIZE_MAX; | |
7554 | ||
75b28aff HV |
7555 | return off; |
7556 | } | |
7557 | ||
2b188cc1 JA |
7558 | static unsigned long ring_pages(unsigned sq_entries, unsigned cq_entries) |
7559 | { | |
75b28aff | 7560 | size_t pages; |
2b188cc1 | 7561 | |
75b28aff HV |
7562 | pages = (size_t)1 << get_order( |
7563 | rings_size(sq_entries, cq_entries, NULL)); | |
7564 | pages += (size_t)1 << get_order( | |
7565 | array_size(sizeof(struct io_uring_sqe), sq_entries)); | |
2b188cc1 | 7566 | |
75b28aff | 7567 | return pages; |
2b188cc1 JA |
7568 | } |
7569 | ||
edafccee JA |
7570 | static int io_sqe_buffer_unregister(struct io_ring_ctx *ctx) |
7571 | { | |
7572 | int i, j; | |
7573 | ||
7574 | if (!ctx->user_bufs) | |
7575 | return -ENXIO; | |
7576 | ||
7577 | for (i = 0; i < ctx->nr_user_bufs; i++) { | |
7578 | struct io_mapped_ubuf *imu = &ctx->user_bufs[i]; | |
7579 | ||
7580 | for (j = 0; j < imu->nr_bvecs; j++) | |
f1f6a7dd | 7581 | unpin_user_page(imu->bvec[j].bv_page); |
edafccee | 7582 | |
2e0464d4 | 7583 | io_unaccount_mem(ctx, imu->nr_bvecs, ACCT_PINNED); |
d4ef6475 | 7584 | kvfree(imu->bvec); |
edafccee JA |
7585 | imu->nr_bvecs = 0; |
7586 | } | |
7587 | ||
7588 | kfree(ctx->user_bufs); | |
7589 | ctx->user_bufs = NULL; | |
7590 | ctx->nr_user_bufs = 0; | |
7591 | return 0; | |
7592 | } | |
7593 | ||
7594 | static int io_copy_iov(struct io_ring_ctx *ctx, struct iovec *dst, | |
7595 | void __user *arg, unsigned index) | |
7596 | { | |
7597 | struct iovec __user *src; | |
7598 | ||
7599 | #ifdef CONFIG_COMPAT | |
7600 | if (ctx->compat) { | |
7601 | struct compat_iovec __user *ciovs; | |
7602 | struct compat_iovec ciov; | |
7603 | ||
7604 | ciovs = (struct compat_iovec __user *) arg; | |
7605 | if (copy_from_user(&ciov, &ciovs[index], sizeof(ciov))) | |
7606 | return -EFAULT; | |
7607 | ||
d55e5f5b | 7608 | dst->iov_base = u64_to_user_ptr((u64)ciov.iov_base); |
edafccee JA |
7609 | dst->iov_len = ciov.iov_len; |
7610 | return 0; | |
7611 | } | |
7612 | #endif | |
7613 | src = (struct iovec __user *) arg; | |
7614 | if (copy_from_user(dst, &src[index], sizeof(*dst))) | |
7615 | return -EFAULT; | |
7616 | return 0; | |
7617 | } | |
7618 | ||
7619 | static int io_sqe_buffer_register(struct io_ring_ctx *ctx, void __user *arg, | |
7620 | unsigned nr_args) | |
7621 | { | |
7622 | struct vm_area_struct **vmas = NULL; | |
7623 | struct page **pages = NULL; | |
7624 | int i, j, got_pages = 0; | |
7625 | int ret = -EINVAL; | |
7626 | ||
7627 | if (ctx->user_bufs) | |
7628 | return -EBUSY; | |
7629 | if (!nr_args || nr_args > UIO_MAXIOV) | |
7630 | return -EINVAL; | |
7631 | ||
7632 | ctx->user_bufs = kcalloc(nr_args, sizeof(struct io_mapped_ubuf), | |
7633 | GFP_KERNEL); | |
7634 | if (!ctx->user_bufs) | |
7635 | return -ENOMEM; | |
7636 | ||
7637 | for (i = 0; i < nr_args; i++) { | |
7638 | struct io_mapped_ubuf *imu = &ctx->user_bufs[i]; | |
7639 | unsigned long off, start, end, ubuf; | |
7640 | int pret, nr_pages; | |
7641 | struct iovec iov; | |
7642 | size_t size; | |
7643 | ||
7644 | ret = io_copy_iov(ctx, &iov, arg, i); | |
7645 | if (ret) | |
a278682d | 7646 | goto err; |
edafccee JA |
7647 | |
7648 | /* | |
7649 | * Don't impose further limits on the size and buffer | |
7650 | * constraints here, we'll -EINVAL later when IO is | |
7651 | * submitted if they are wrong. | |
7652 | */ | |
7653 | ret = -EFAULT; | |
7654 | if (!iov.iov_base || !iov.iov_len) | |
7655 | goto err; | |
7656 | ||
7657 | /* arbitrary limit, but we need something */ | |
7658 | if (iov.iov_len > SZ_1G) | |
7659 | goto err; | |
7660 | ||
7661 | ubuf = (unsigned long) iov.iov_base; | |
7662 | end = (ubuf + iov.iov_len + PAGE_SIZE - 1) >> PAGE_SHIFT; | |
7663 | start = ubuf >> PAGE_SHIFT; | |
7664 | nr_pages = end - start; | |
7665 | ||
2e0464d4 | 7666 | ret = io_account_mem(ctx, nr_pages, ACCT_PINNED); |
a087e2b5 BM |
7667 | if (ret) |
7668 | goto err; | |
edafccee JA |
7669 | |
7670 | ret = 0; | |
7671 | if (!pages || nr_pages > got_pages) { | |
a8c73c1a DE |
7672 | kvfree(vmas); |
7673 | kvfree(pages); | |
d4ef6475 | 7674 | pages = kvmalloc_array(nr_pages, sizeof(struct page *), |
edafccee | 7675 | GFP_KERNEL); |
d4ef6475 | 7676 | vmas = kvmalloc_array(nr_pages, |
edafccee JA |
7677 | sizeof(struct vm_area_struct *), |
7678 | GFP_KERNEL); | |
7679 | if (!pages || !vmas) { | |
7680 | ret = -ENOMEM; | |
2e0464d4 | 7681 | io_unaccount_mem(ctx, nr_pages, ACCT_PINNED); |
edafccee JA |
7682 | goto err; |
7683 | } | |
7684 | got_pages = nr_pages; | |
7685 | } | |
7686 | ||
d4ef6475 | 7687 | imu->bvec = kvmalloc_array(nr_pages, sizeof(struct bio_vec), |
edafccee JA |
7688 | GFP_KERNEL); |
7689 | ret = -ENOMEM; | |
7690 | if (!imu->bvec) { | |
2e0464d4 | 7691 | io_unaccount_mem(ctx, nr_pages, ACCT_PINNED); |
edafccee JA |
7692 | goto err; |
7693 | } | |
7694 | ||
7695 | ret = 0; | |
d8ed45c5 | 7696 | mmap_read_lock(current->mm); |
2113b05d | 7697 | pret = pin_user_pages(ubuf, nr_pages, |
932f4a63 IW |
7698 | FOLL_WRITE | FOLL_LONGTERM, |
7699 | pages, vmas); | |
edafccee JA |
7700 | if (pret == nr_pages) { |
7701 | /* don't support file backed memory */ | |
7702 | for (j = 0; j < nr_pages; j++) { | |
7703 | struct vm_area_struct *vma = vmas[j]; | |
7704 | ||
7705 | if (vma->vm_file && | |
7706 | !is_file_hugepages(vma->vm_file)) { | |
7707 | ret = -EOPNOTSUPP; | |
7708 | break; | |
7709 | } | |
7710 | } | |
7711 | } else { | |
7712 | ret = pret < 0 ? pret : -EFAULT; | |
7713 | } | |
d8ed45c5 | 7714 | mmap_read_unlock(current->mm); |
edafccee JA |
7715 | if (ret) { |
7716 | /* | |
7717 | * if we did partial map, or found file backed vmas, | |
7718 | * release any pages we did get | |
7719 | */ | |
27c4d3a3 | 7720 | if (pret > 0) |
f1f6a7dd | 7721 | unpin_user_pages(pages, pret); |
2e0464d4 | 7722 | io_unaccount_mem(ctx, nr_pages, ACCT_PINNED); |
d4ef6475 | 7723 | kvfree(imu->bvec); |
edafccee JA |
7724 | goto err; |
7725 | } | |
7726 | ||
7727 | off = ubuf & ~PAGE_MASK; | |
7728 | size = iov.iov_len; | |
7729 | for (j = 0; j < nr_pages; j++) { | |
7730 | size_t vec_len; | |
7731 | ||
7732 | vec_len = min_t(size_t, size, PAGE_SIZE - off); | |
7733 | imu->bvec[j].bv_page = pages[j]; | |
7734 | imu->bvec[j].bv_len = vec_len; | |
7735 | imu->bvec[j].bv_offset = off; | |
7736 | off = 0; | |
7737 | size -= vec_len; | |
7738 | } | |
7739 | /* store original address for later verification */ | |
7740 | imu->ubuf = ubuf; | |
7741 | imu->len = iov.iov_len; | |
7742 | imu->nr_bvecs = nr_pages; | |
7743 | ||
7744 | ctx->nr_user_bufs++; | |
7745 | } | |
d4ef6475 MR |
7746 | kvfree(pages); |
7747 | kvfree(vmas); | |
edafccee JA |
7748 | return 0; |
7749 | err: | |
d4ef6475 MR |
7750 | kvfree(pages); |
7751 | kvfree(vmas); | |
edafccee JA |
7752 | io_sqe_buffer_unregister(ctx); |
7753 | return ret; | |
7754 | } | |
7755 | ||
9b402849 JA |
7756 | static int io_eventfd_register(struct io_ring_ctx *ctx, void __user *arg) |
7757 | { | |
7758 | __s32 __user *fds = arg; | |
7759 | int fd; | |
7760 | ||
7761 | if (ctx->cq_ev_fd) | |
7762 | return -EBUSY; | |
7763 | ||
7764 | if (copy_from_user(&fd, fds, sizeof(*fds))) | |
7765 | return -EFAULT; | |
7766 | ||
7767 | ctx->cq_ev_fd = eventfd_ctx_fdget(fd); | |
7768 | if (IS_ERR(ctx->cq_ev_fd)) { | |
7769 | int ret = PTR_ERR(ctx->cq_ev_fd); | |
7770 | ctx->cq_ev_fd = NULL; | |
7771 | return ret; | |
7772 | } | |
7773 | ||
7774 | return 0; | |
7775 | } | |
7776 | ||
7777 | static int io_eventfd_unregister(struct io_ring_ctx *ctx) | |
7778 | { | |
7779 | if (ctx->cq_ev_fd) { | |
7780 | eventfd_ctx_put(ctx->cq_ev_fd); | |
7781 | ctx->cq_ev_fd = NULL; | |
7782 | return 0; | |
7783 | } | |
7784 | ||
7785 | return -ENXIO; | |
7786 | } | |
7787 | ||
5a2e745d JA |
7788 | static int __io_destroy_buffers(int id, void *p, void *data) |
7789 | { | |
7790 | struct io_ring_ctx *ctx = data; | |
7791 | struct io_buffer *buf = p; | |
7792 | ||
067524e9 | 7793 | __io_remove_buffers(ctx, buf, id, -1U); |
5a2e745d JA |
7794 | return 0; |
7795 | } | |
7796 | ||
7797 | static void io_destroy_buffers(struct io_ring_ctx *ctx) | |
7798 | { | |
7799 | idr_for_each(&ctx->io_buffer_idr, __io_destroy_buffers, ctx); | |
7800 | idr_destroy(&ctx->io_buffer_idr); | |
7801 | } | |
7802 | ||
2b188cc1 JA |
7803 | static void io_ring_ctx_free(struct io_ring_ctx *ctx) |
7804 | { | |
6b06314c | 7805 | io_finish_async(ctx); |
5dbcad51 | 7806 | io_sqe_buffer_unregister(ctx); |
30975825 | 7807 | if (ctx->sqo_mm) { |
2b188cc1 | 7808 | mmdrop(ctx->sqo_mm); |
30975825 BM |
7809 | ctx->sqo_mm = NULL; |
7810 | } | |
def596e9 | 7811 | |
6b06314c | 7812 | io_sqe_files_unregister(ctx); |
9b402849 | 7813 | io_eventfd_unregister(ctx); |
5a2e745d | 7814 | io_destroy_buffers(ctx); |
41726c9a | 7815 | idr_destroy(&ctx->personality_idr); |
def596e9 | 7816 | |
2b188cc1 | 7817 | #if defined(CONFIG_UNIX) |
355e8d26 EB |
7818 | if (ctx->ring_sock) { |
7819 | ctx->ring_sock->file = NULL; /* so that iput() is called */ | |
2b188cc1 | 7820 | sock_release(ctx->ring_sock); |
355e8d26 | 7821 | } |
2b188cc1 JA |
7822 | #endif |
7823 | ||
75b28aff | 7824 | io_mem_free(ctx->rings); |
2b188cc1 | 7825 | io_mem_free(ctx->sq_sqes); |
2b188cc1 JA |
7826 | |
7827 | percpu_ref_exit(&ctx->refs); | |
2b188cc1 | 7828 | free_uid(ctx->user); |
181e448d | 7829 | put_cred(ctx->creds); |
78076bb6 | 7830 | kfree(ctx->cancel_hash); |
0ddf92e8 | 7831 | kmem_cache_free(req_cachep, ctx->fallback_req); |
2b188cc1 JA |
7832 | kfree(ctx); |
7833 | } | |
7834 | ||
7835 | static __poll_t io_uring_poll(struct file *file, poll_table *wait) | |
7836 | { | |
7837 | struct io_ring_ctx *ctx = file->private_data; | |
7838 | __poll_t mask = 0; | |
7839 | ||
7840 | poll_wait(file, &ctx->cq_wait, wait); | |
4f7067c3 SB |
7841 | /* |
7842 | * synchronizes with barrier from wq_has_sleeper call in | |
7843 | * io_commit_cqring | |
7844 | */ | |
2b188cc1 | 7845 | smp_rmb(); |
75b28aff HV |
7846 | if (READ_ONCE(ctx->rings->sq.tail) - ctx->cached_sq_head != |
7847 | ctx->rings->sq_ring_entries) | |
2b188cc1 | 7848 | mask |= EPOLLOUT | EPOLLWRNORM; |
63e5d81f | 7849 | if (io_cqring_events(ctx, false)) |
2b188cc1 JA |
7850 | mask |= EPOLLIN | EPOLLRDNORM; |
7851 | ||
7852 | return mask; | |
7853 | } | |
7854 | ||
7855 | static int io_uring_fasync(int fd, struct file *file, int on) | |
7856 | { | |
7857 | struct io_ring_ctx *ctx = file->private_data; | |
7858 | ||
7859 | return fasync_helper(fd, file, on, &ctx->cq_fasync); | |
7860 | } | |
7861 | ||
071698e1 JA |
7862 | static int io_remove_personalities(int id, void *p, void *data) |
7863 | { | |
7864 | struct io_ring_ctx *ctx = data; | |
7865 | const struct cred *cred; | |
7866 | ||
7867 | cred = idr_remove(&ctx->personality_idr, id); | |
7868 | if (cred) | |
7869 | put_cred(cred); | |
7870 | return 0; | |
7871 | } | |
7872 | ||
85faa7b8 JA |
7873 | static void io_ring_exit_work(struct work_struct *work) |
7874 | { | |
b2edc0a7 PB |
7875 | struct io_ring_ctx *ctx = container_of(work, struct io_ring_ctx, |
7876 | exit_work); | |
85faa7b8 | 7877 | |
56952e91 JA |
7878 | /* |
7879 | * If we're doing polled IO and end up having requests being | |
7880 | * submitted async (out-of-line), then completions can come in while | |
7881 | * we're waiting for refs to drop. We need to reap these manually, | |
7882 | * as nobody else will be looking for them. | |
7883 | */ | |
b2edc0a7 | 7884 | do { |
56952e91 JA |
7885 | if (ctx->rings) |
7886 | io_cqring_overflow_flush(ctx, true); | |
b2edc0a7 PB |
7887 | io_iopoll_try_reap_events(ctx); |
7888 | } while (!wait_for_completion_timeout(&ctx->ref_comp, HZ/20)); | |
85faa7b8 JA |
7889 | io_ring_ctx_free(ctx); |
7890 | } | |
7891 | ||
2b188cc1 JA |
7892 | static void io_ring_ctx_wait_and_kill(struct io_ring_ctx *ctx) |
7893 | { | |
7894 | mutex_lock(&ctx->uring_lock); | |
7895 | percpu_ref_kill(&ctx->refs); | |
7896 | mutex_unlock(&ctx->uring_lock); | |
7897 | ||
5262f567 | 7898 | io_kill_timeouts(ctx); |
221c5eb2 | 7899 | io_poll_remove_all(ctx); |
561fb04a JA |
7900 | |
7901 | if (ctx->io_wq) | |
7902 | io_wq_cancel_all(ctx->io_wq); | |
7903 | ||
15dff286 JA |
7904 | /* if we failed setting up the ctx, we might not have any rings */ |
7905 | if (ctx->rings) | |
7906 | io_cqring_overflow_flush(ctx, true); | |
b2edc0a7 | 7907 | io_iopoll_try_reap_events(ctx); |
071698e1 | 7908 | idr_for_each(&ctx->personality_idr, io_remove_personalities, ctx); |
309fc03a JA |
7909 | |
7910 | /* | |
7911 | * Do this upfront, so we won't have a grace period where the ring | |
7912 | * is closed but resources aren't reaped yet. This can cause | |
7913 | * spurious failure in setting up a new ring. | |
7914 | */ | |
760618f7 JA |
7915 | io_unaccount_mem(ctx, ring_pages(ctx->sq_entries, ctx->cq_entries), |
7916 | ACCT_LOCKED); | |
309fc03a | 7917 | |
85faa7b8 JA |
7918 | INIT_WORK(&ctx->exit_work, io_ring_exit_work); |
7919 | queue_work(system_wq, &ctx->exit_work); | |
2b188cc1 JA |
7920 | } |
7921 | ||
7922 | static int io_uring_release(struct inode *inode, struct file *file) | |
7923 | { | |
7924 | struct io_ring_ctx *ctx = file->private_data; | |
7925 | ||
7926 | file->private_data = NULL; | |
7927 | io_ring_ctx_wait_and_kill(ctx); | |
7928 | return 0; | |
7929 | } | |
7930 | ||
67c4d9e6 PB |
7931 | static bool io_wq_files_match(struct io_wq_work *work, void *data) |
7932 | { | |
7933 | struct files_struct *files = data; | |
7934 | ||
7935 | return work->files == files; | |
7936 | } | |
7937 | ||
fcb323cc JA |
7938 | static void io_uring_cancel_files(struct io_ring_ctx *ctx, |
7939 | struct files_struct *files) | |
7940 | { | |
67c4d9e6 PB |
7941 | if (list_empty_careful(&ctx->inflight_list)) |
7942 | return; | |
7943 | ||
7944 | /* cancel all at once, should be faster than doing it one by one*/ | |
7945 | io_wq_cancel_cb(ctx->io_wq, io_wq_files_match, files, true); | |
7946 | ||
fcb323cc | 7947 | while (!list_empty_careful(&ctx->inflight_list)) { |
d8f1b971 XW |
7948 | struct io_kiocb *cancel_req = NULL, *req; |
7949 | DEFINE_WAIT(wait); | |
fcb323cc JA |
7950 | |
7951 | spin_lock_irq(&ctx->inflight_lock); | |
7952 | list_for_each_entry(req, &ctx->inflight_list, inflight_entry) { | |
768134d4 JA |
7953 | if (req->work.files != files) |
7954 | continue; | |
7955 | /* req is being completed, ignore */ | |
7956 | if (!refcount_inc_not_zero(&req->refs)) | |
7957 | continue; | |
7958 | cancel_req = req; | |
7959 | break; | |
fcb323cc | 7960 | } |
768134d4 | 7961 | if (cancel_req) |
fcb323cc | 7962 | prepare_to_wait(&ctx->inflight_wait, &wait, |
768134d4 | 7963 | TASK_UNINTERRUPTIBLE); |
fcb323cc JA |
7964 | spin_unlock_irq(&ctx->inflight_lock); |
7965 | ||
768134d4 JA |
7966 | /* We need to keep going until we don't find a matching req */ |
7967 | if (!cancel_req) | |
fcb323cc | 7968 | break; |
2f6d9b9d | 7969 | |
2ca10259 JA |
7970 | if (cancel_req->flags & REQ_F_OVERFLOW) { |
7971 | spin_lock_irq(&ctx->completion_lock); | |
40d8ddd4 | 7972 | list_del(&cancel_req->compl.list); |
2ca10259 | 7973 | cancel_req->flags &= ~REQ_F_OVERFLOW; |
2ca10259 | 7974 | |
46930143 | 7975 | io_cqring_mark_overflow(ctx); |
2ca10259 JA |
7976 | WRITE_ONCE(ctx->rings->cq_overflow, |
7977 | atomic_inc_return(&ctx->cached_cq_overflow)); | |
dd9dfcdf | 7978 | io_commit_cqring(ctx); |
b2bd1cf9 | 7979 | spin_unlock_irq(&ctx->completion_lock); |
2ca10259 JA |
7980 | |
7981 | /* | |
7982 | * Put inflight ref and overflow ref. If that's | |
7983 | * all we had, then we're done with this request. | |
7984 | */ | |
7985 | if (refcount_sub_and_test(2, &cancel_req->refs)) { | |
4518a3cc | 7986 | io_free_req(cancel_req); |
d8f1b971 | 7987 | finish_wait(&ctx->inflight_wait, &wait); |
2ca10259 JA |
7988 | continue; |
7989 | } | |
7b53d598 PB |
7990 | } else { |
7991 | io_wq_cancel_work(ctx->io_wq, &cancel_req->work); | |
7992 | io_put_req(cancel_req); | |
2ca10259 JA |
7993 | } |
7994 | ||
fcb323cc | 7995 | schedule(); |
d8f1b971 | 7996 | finish_wait(&ctx->inflight_wait, &wait); |
fcb323cc JA |
7997 | } |
7998 | } | |
7999 | ||
801dd57b | 8000 | static bool io_cancel_task_cb(struct io_wq_work *work, void *data) |
44e728b8 | 8001 | { |
801dd57b PB |
8002 | struct io_kiocb *req = container_of(work, struct io_kiocb, work); |
8003 | struct task_struct *task = data; | |
44e728b8 | 8004 | |
801dd57b | 8005 | return req->task == task; |
44e728b8 PB |
8006 | } |
8007 | ||
fcb323cc JA |
8008 | static int io_uring_flush(struct file *file, void *data) |
8009 | { | |
8010 | struct io_ring_ctx *ctx = file->private_data; | |
8011 | ||
8012 | io_uring_cancel_files(ctx, data); | |
6ab23144 JA |
8013 | |
8014 | /* | |
8015 | * If the task is going away, cancel work it may have pending | |
8016 | */ | |
801dd57b PB |
8017 | if (fatal_signal_pending(current) || (current->flags & PF_EXITING)) |
8018 | io_wq_cancel_cb(ctx->io_wq, io_cancel_task_cb, current, true); | |
6ab23144 | 8019 | |
fcb323cc JA |
8020 | return 0; |
8021 | } | |
8022 | ||
6c5c240e RP |
8023 | static void *io_uring_validate_mmap_request(struct file *file, |
8024 | loff_t pgoff, size_t sz) | |
2b188cc1 | 8025 | { |
2b188cc1 | 8026 | struct io_ring_ctx *ctx = file->private_data; |
6c5c240e | 8027 | loff_t offset = pgoff << PAGE_SHIFT; |
2b188cc1 JA |
8028 | struct page *page; |
8029 | void *ptr; | |
8030 | ||
8031 | switch (offset) { | |
8032 | case IORING_OFF_SQ_RING: | |
75b28aff HV |
8033 | case IORING_OFF_CQ_RING: |
8034 | ptr = ctx->rings; | |
2b188cc1 JA |
8035 | break; |
8036 | case IORING_OFF_SQES: | |
8037 | ptr = ctx->sq_sqes; | |
8038 | break; | |
2b188cc1 | 8039 | default: |
6c5c240e | 8040 | return ERR_PTR(-EINVAL); |
2b188cc1 JA |
8041 | } |
8042 | ||
8043 | page = virt_to_head_page(ptr); | |
a50b854e | 8044 | if (sz > page_size(page)) |
6c5c240e RP |
8045 | return ERR_PTR(-EINVAL); |
8046 | ||
8047 | return ptr; | |
8048 | } | |
8049 | ||
8050 | #ifdef CONFIG_MMU | |
8051 | ||
8052 | static int io_uring_mmap(struct file *file, struct vm_area_struct *vma) | |
8053 | { | |
8054 | size_t sz = vma->vm_end - vma->vm_start; | |
8055 | unsigned long pfn; | |
8056 | void *ptr; | |
8057 | ||
8058 | ptr = io_uring_validate_mmap_request(file, vma->vm_pgoff, sz); | |
8059 | if (IS_ERR(ptr)) | |
8060 | return PTR_ERR(ptr); | |
2b188cc1 JA |
8061 | |
8062 | pfn = virt_to_phys(ptr) >> PAGE_SHIFT; | |
8063 | return remap_pfn_range(vma, vma->vm_start, pfn, sz, vma->vm_page_prot); | |
8064 | } | |
8065 | ||
6c5c240e RP |
8066 | #else /* !CONFIG_MMU */ |
8067 | ||
8068 | static int io_uring_mmap(struct file *file, struct vm_area_struct *vma) | |
8069 | { | |
8070 | return vma->vm_flags & (VM_SHARED | VM_MAYSHARE) ? 0 : -EINVAL; | |
8071 | } | |
8072 | ||
8073 | static unsigned int io_uring_nommu_mmap_capabilities(struct file *file) | |
8074 | { | |
8075 | return NOMMU_MAP_DIRECT | NOMMU_MAP_READ | NOMMU_MAP_WRITE; | |
8076 | } | |
8077 | ||
8078 | static unsigned long io_uring_nommu_get_unmapped_area(struct file *file, | |
8079 | unsigned long addr, unsigned long len, | |
8080 | unsigned long pgoff, unsigned long flags) | |
8081 | { | |
8082 | void *ptr; | |
8083 | ||
8084 | ptr = io_uring_validate_mmap_request(file, pgoff, len); | |
8085 | if (IS_ERR(ptr)) | |
8086 | return PTR_ERR(ptr); | |
8087 | ||
8088 | return (unsigned long) ptr; | |
8089 | } | |
8090 | ||
8091 | #endif /* !CONFIG_MMU */ | |
8092 | ||
2b188cc1 JA |
8093 | SYSCALL_DEFINE6(io_uring_enter, unsigned int, fd, u32, to_submit, |
8094 | u32, min_complete, u32, flags, const sigset_t __user *, sig, | |
8095 | size_t, sigsz) | |
8096 | { | |
8097 | struct io_ring_ctx *ctx; | |
8098 | long ret = -EBADF; | |
8099 | int submitted = 0; | |
8100 | struct fd f; | |
8101 | ||
4c6e277c | 8102 | io_run_task_work(); |
b41e9852 | 8103 | |
6c271ce2 | 8104 | if (flags & ~(IORING_ENTER_GETEVENTS | IORING_ENTER_SQ_WAKEUP)) |
2b188cc1 JA |
8105 | return -EINVAL; |
8106 | ||
8107 | f = fdget(fd); | |
8108 | if (!f.file) | |
8109 | return -EBADF; | |
8110 | ||
8111 | ret = -EOPNOTSUPP; | |
8112 | if (f.file->f_op != &io_uring_fops) | |
8113 | goto out_fput; | |
8114 | ||
8115 | ret = -ENXIO; | |
8116 | ctx = f.file->private_data; | |
8117 | if (!percpu_ref_tryget(&ctx->refs)) | |
8118 | goto out_fput; | |
8119 | ||
6c271ce2 JA |
8120 | /* |
8121 | * For SQ polling, the thread will do all submissions and completions. | |
8122 | * Just return the requested submit count, and wake the thread if | |
8123 | * we were asked to. | |
8124 | */ | |
b2a9eada | 8125 | ret = 0; |
6c271ce2 | 8126 | if (ctx->flags & IORING_SETUP_SQPOLL) { |
c1edbf5f JA |
8127 | if (!list_empty_careful(&ctx->cq_overflow_list)) |
8128 | io_cqring_overflow_flush(ctx, false); | |
6c271ce2 JA |
8129 | if (flags & IORING_ENTER_SQ_WAKEUP) |
8130 | wake_up(&ctx->sqo_wait); | |
8131 | submitted = to_submit; | |
b2a9eada | 8132 | } else if (to_submit) { |
2b188cc1 | 8133 | mutex_lock(&ctx->uring_lock); |
0cdaf760 | 8134 | submitted = io_submit_sqes(ctx, to_submit, f.file, fd); |
2b188cc1 | 8135 | mutex_unlock(&ctx->uring_lock); |
7c504e65 PB |
8136 | |
8137 | if (submitted != to_submit) | |
8138 | goto out; | |
2b188cc1 JA |
8139 | } |
8140 | if (flags & IORING_ENTER_GETEVENTS) { | |
8141 | min_complete = min(min_complete, ctx->cq_entries); | |
8142 | ||
32b2244a XW |
8143 | /* |
8144 | * When SETUP_IOPOLL and SETUP_SQPOLL are both enabled, user | |
8145 | * space applications don't need to do io completion events | |
8146 | * polling again, they can rely on io_sq_thread to do polling | |
8147 | * work, which can reduce cpu usage and uring_lock contention. | |
8148 | */ | |
8149 | if (ctx->flags & IORING_SETUP_IOPOLL && | |
8150 | !(ctx->flags & IORING_SETUP_SQPOLL)) { | |
7668b92a | 8151 | ret = io_iopoll_check(ctx, min_complete); |
def596e9 JA |
8152 | } else { |
8153 | ret = io_cqring_wait(ctx, min_complete, sig, sigsz); | |
8154 | } | |
2b188cc1 JA |
8155 | } |
8156 | ||
7c504e65 | 8157 | out: |
6805b32e | 8158 | percpu_ref_put(&ctx->refs); |
2b188cc1 JA |
8159 | out_fput: |
8160 | fdput(f); | |
8161 | return submitted ? submitted : ret; | |
8162 | } | |
8163 | ||
bebdb65e | 8164 | #ifdef CONFIG_PROC_FS |
87ce955b JA |
8165 | static int io_uring_show_cred(int id, void *p, void *data) |
8166 | { | |
8167 | const struct cred *cred = p; | |
8168 | struct seq_file *m = data; | |
8169 | struct user_namespace *uns = seq_user_ns(m); | |
8170 | struct group_info *gi; | |
8171 | kernel_cap_t cap; | |
8172 | unsigned __capi; | |
8173 | int g; | |
8174 | ||
8175 | seq_printf(m, "%5d\n", id); | |
8176 | seq_put_decimal_ull(m, "\tUid:\t", from_kuid_munged(uns, cred->uid)); | |
8177 | seq_put_decimal_ull(m, "\t\t", from_kuid_munged(uns, cred->euid)); | |
8178 | seq_put_decimal_ull(m, "\t\t", from_kuid_munged(uns, cred->suid)); | |
8179 | seq_put_decimal_ull(m, "\t\t", from_kuid_munged(uns, cred->fsuid)); | |
8180 | seq_put_decimal_ull(m, "\n\tGid:\t", from_kgid_munged(uns, cred->gid)); | |
8181 | seq_put_decimal_ull(m, "\t\t", from_kgid_munged(uns, cred->egid)); | |
8182 | seq_put_decimal_ull(m, "\t\t", from_kgid_munged(uns, cred->sgid)); | |
8183 | seq_put_decimal_ull(m, "\t\t", from_kgid_munged(uns, cred->fsgid)); | |
8184 | seq_puts(m, "\n\tGroups:\t"); | |
8185 | gi = cred->group_info; | |
8186 | for (g = 0; g < gi->ngroups; g++) { | |
8187 | seq_put_decimal_ull(m, g ? " " : "", | |
8188 | from_kgid_munged(uns, gi->gid[g])); | |
8189 | } | |
8190 | seq_puts(m, "\n\tCapEff:\t"); | |
8191 | cap = cred->cap_effective; | |
8192 | CAP_FOR_EACH_U32(__capi) | |
8193 | seq_put_hex_ll(m, NULL, cap.cap[CAP_LAST_U32 - __capi], 8); | |
8194 | seq_putc(m, '\n'); | |
8195 | return 0; | |
8196 | } | |
8197 | ||
8198 | static void __io_uring_show_fdinfo(struct io_ring_ctx *ctx, struct seq_file *m) | |
8199 | { | |
8200 | int i; | |
8201 | ||
8202 | mutex_lock(&ctx->uring_lock); | |
8203 | seq_printf(m, "UserFiles:\t%u\n", ctx->nr_user_files); | |
8204 | for (i = 0; i < ctx->nr_user_files; i++) { | |
8205 | struct fixed_file_table *table; | |
8206 | struct file *f; | |
8207 | ||
8208 | table = &ctx->file_data->table[i >> IORING_FILE_TABLE_SHIFT]; | |
8209 | f = table->files[i & IORING_FILE_TABLE_MASK]; | |
8210 | if (f) | |
8211 | seq_printf(m, "%5u: %s\n", i, file_dentry(f)->d_iname); | |
8212 | else | |
8213 | seq_printf(m, "%5u: <none>\n", i); | |
8214 | } | |
8215 | seq_printf(m, "UserBufs:\t%u\n", ctx->nr_user_bufs); | |
8216 | for (i = 0; i < ctx->nr_user_bufs; i++) { | |
8217 | struct io_mapped_ubuf *buf = &ctx->user_bufs[i]; | |
8218 | ||
8219 | seq_printf(m, "%5u: 0x%llx/%u\n", i, buf->ubuf, | |
8220 | (unsigned int) buf->len); | |
8221 | } | |
8222 | if (!idr_is_empty(&ctx->personality_idr)) { | |
8223 | seq_printf(m, "Personalities:\n"); | |
8224 | idr_for_each(&ctx->personality_idr, io_uring_show_cred, m); | |
8225 | } | |
d7718a9d JA |
8226 | seq_printf(m, "PollList:\n"); |
8227 | spin_lock_irq(&ctx->completion_lock); | |
8228 | for (i = 0; i < (1U << ctx->cancel_hash_bits); i++) { | |
8229 | struct hlist_head *list = &ctx->cancel_hash[i]; | |
8230 | struct io_kiocb *req; | |
8231 | ||
8232 | hlist_for_each_entry(req, list, hash_node) | |
8233 | seq_printf(m, " op=%d, task_works=%d\n", req->opcode, | |
8234 | req->task->task_works != NULL); | |
8235 | } | |
8236 | spin_unlock_irq(&ctx->completion_lock); | |
87ce955b JA |
8237 | mutex_unlock(&ctx->uring_lock); |
8238 | } | |
8239 | ||
8240 | static void io_uring_show_fdinfo(struct seq_file *m, struct file *f) | |
8241 | { | |
8242 | struct io_ring_ctx *ctx = f->private_data; | |
8243 | ||
8244 | if (percpu_ref_tryget(&ctx->refs)) { | |
8245 | __io_uring_show_fdinfo(ctx, m); | |
8246 | percpu_ref_put(&ctx->refs); | |
8247 | } | |
8248 | } | |
bebdb65e | 8249 | #endif |
87ce955b | 8250 | |
2b188cc1 JA |
8251 | static const struct file_operations io_uring_fops = { |
8252 | .release = io_uring_release, | |
fcb323cc | 8253 | .flush = io_uring_flush, |
2b188cc1 | 8254 | .mmap = io_uring_mmap, |
6c5c240e RP |
8255 | #ifndef CONFIG_MMU |
8256 | .get_unmapped_area = io_uring_nommu_get_unmapped_area, | |
8257 | .mmap_capabilities = io_uring_nommu_mmap_capabilities, | |
8258 | #endif | |
2b188cc1 JA |
8259 | .poll = io_uring_poll, |
8260 | .fasync = io_uring_fasync, | |
bebdb65e | 8261 | #ifdef CONFIG_PROC_FS |
87ce955b | 8262 | .show_fdinfo = io_uring_show_fdinfo, |
bebdb65e | 8263 | #endif |
2b188cc1 JA |
8264 | }; |
8265 | ||
8266 | static int io_allocate_scq_urings(struct io_ring_ctx *ctx, | |
8267 | struct io_uring_params *p) | |
8268 | { | |
75b28aff HV |
8269 | struct io_rings *rings; |
8270 | size_t size, sq_array_offset; | |
2b188cc1 | 8271 | |
bd740481 JA |
8272 | /* make sure these are sane, as we already accounted them */ |
8273 | ctx->sq_entries = p->sq_entries; | |
8274 | ctx->cq_entries = p->cq_entries; | |
8275 | ||
75b28aff HV |
8276 | size = rings_size(p->sq_entries, p->cq_entries, &sq_array_offset); |
8277 | if (size == SIZE_MAX) | |
8278 | return -EOVERFLOW; | |
8279 | ||
8280 | rings = io_mem_alloc(size); | |
8281 | if (!rings) | |
2b188cc1 JA |
8282 | return -ENOMEM; |
8283 | ||
75b28aff HV |
8284 | ctx->rings = rings; |
8285 | ctx->sq_array = (u32 *)((char *)rings + sq_array_offset); | |
8286 | rings->sq_ring_mask = p->sq_entries - 1; | |
8287 | rings->cq_ring_mask = p->cq_entries - 1; | |
8288 | rings->sq_ring_entries = p->sq_entries; | |
8289 | rings->cq_ring_entries = p->cq_entries; | |
8290 | ctx->sq_mask = rings->sq_ring_mask; | |
8291 | ctx->cq_mask = rings->cq_ring_mask; | |
2b188cc1 JA |
8292 | |
8293 | size = array_size(sizeof(struct io_uring_sqe), p->sq_entries); | |
eb065d30 JA |
8294 | if (size == SIZE_MAX) { |
8295 | io_mem_free(ctx->rings); | |
8296 | ctx->rings = NULL; | |
2b188cc1 | 8297 | return -EOVERFLOW; |
eb065d30 | 8298 | } |
2b188cc1 JA |
8299 | |
8300 | ctx->sq_sqes = io_mem_alloc(size); | |
eb065d30 JA |
8301 | if (!ctx->sq_sqes) { |
8302 | io_mem_free(ctx->rings); | |
8303 | ctx->rings = NULL; | |
2b188cc1 | 8304 | return -ENOMEM; |
eb065d30 | 8305 | } |
2b188cc1 | 8306 | |
2b188cc1 JA |
8307 | return 0; |
8308 | } | |
8309 | ||
8310 | /* | |
8311 | * Allocate an anonymous fd, this is what constitutes the application | |
8312 | * visible backing of an io_uring instance. The application mmaps this | |
8313 | * fd to gain access to the SQ/CQ ring details. If UNIX sockets are enabled, | |
8314 | * we have to tie this fd to a socket for file garbage collection purposes. | |
8315 | */ | |
8316 | static int io_uring_get_fd(struct io_ring_ctx *ctx) | |
8317 | { | |
8318 | struct file *file; | |
8319 | int ret; | |
8320 | ||
8321 | #if defined(CONFIG_UNIX) | |
8322 | ret = sock_create_kern(&init_net, PF_UNIX, SOCK_RAW, IPPROTO_IP, | |
8323 | &ctx->ring_sock); | |
8324 | if (ret) | |
8325 | return ret; | |
8326 | #endif | |
8327 | ||
8328 | ret = get_unused_fd_flags(O_RDWR | O_CLOEXEC); | |
8329 | if (ret < 0) | |
8330 | goto err; | |
8331 | ||
8332 | file = anon_inode_getfile("[io_uring]", &io_uring_fops, ctx, | |
8333 | O_RDWR | O_CLOEXEC); | |
8334 | if (IS_ERR(file)) { | |
8335 | put_unused_fd(ret); | |
8336 | ret = PTR_ERR(file); | |
8337 | goto err; | |
8338 | } | |
8339 | ||
8340 | #if defined(CONFIG_UNIX) | |
8341 | ctx->ring_sock->file = file; | |
8342 | #endif | |
8343 | fd_install(ret, file); | |
8344 | return ret; | |
8345 | err: | |
8346 | #if defined(CONFIG_UNIX) | |
8347 | sock_release(ctx->ring_sock); | |
8348 | ctx->ring_sock = NULL; | |
8349 | #endif | |
8350 | return ret; | |
8351 | } | |
8352 | ||
7f13657d XW |
8353 | static int io_uring_create(unsigned entries, struct io_uring_params *p, |
8354 | struct io_uring_params __user *params) | |
2b188cc1 JA |
8355 | { |
8356 | struct user_struct *user = NULL; | |
8357 | struct io_ring_ctx *ctx; | |
aad5d8da | 8358 | bool limit_mem; |
2b188cc1 JA |
8359 | int ret; |
8360 | ||
8110c1a6 | 8361 | if (!entries) |
2b188cc1 | 8362 | return -EINVAL; |
8110c1a6 JA |
8363 | if (entries > IORING_MAX_ENTRIES) { |
8364 | if (!(p->flags & IORING_SETUP_CLAMP)) | |
8365 | return -EINVAL; | |
8366 | entries = IORING_MAX_ENTRIES; | |
8367 | } | |
2b188cc1 JA |
8368 | |
8369 | /* | |
8370 | * Use twice as many entries for the CQ ring. It's possible for the | |
8371 | * application to drive a higher depth than the size of the SQ ring, | |
8372 | * since the sqes are only used at submission time. This allows for | |
33a107f0 JA |
8373 | * some flexibility in overcommitting a bit. If the application has |
8374 | * set IORING_SETUP_CQSIZE, it will have passed in the desired number | |
8375 | * of CQ ring entries manually. | |
2b188cc1 JA |
8376 | */ |
8377 | p->sq_entries = roundup_pow_of_two(entries); | |
33a107f0 JA |
8378 | if (p->flags & IORING_SETUP_CQSIZE) { |
8379 | /* | |
8380 | * If IORING_SETUP_CQSIZE is set, we do the same roundup | |
8381 | * to a power-of-two, if it isn't already. We do NOT impose | |
8382 | * any cq vs sq ring sizing. | |
8383 | */ | |
8110c1a6 | 8384 | if (p->cq_entries < p->sq_entries) |
33a107f0 | 8385 | return -EINVAL; |
8110c1a6 JA |
8386 | if (p->cq_entries > IORING_MAX_CQ_ENTRIES) { |
8387 | if (!(p->flags & IORING_SETUP_CLAMP)) | |
8388 | return -EINVAL; | |
8389 | p->cq_entries = IORING_MAX_CQ_ENTRIES; | |
8390 | } | |
33a107f0 JA |
8391 | p->cq_entries = roundup_pow_of_two(p->cq_entries); |
8392 | } else { | |
8393 | p->cq_entries = 2 * p->sq_entries; | |
8394 | } | |
2b188cc1 JA |
8395 | |
8396 | user = get_uid(current_user()); | |
aad5d8da | 8397 | limit_mem = !capable(CAP_IPC_LOCK); |
2b188cc1 | 8398 | |
aad5d8da | 8399 | if (limit_mem) { |
a087e2b5 | 8400 | ret = __io_account_mem(user, |
2b188cc1 JA |
8401 | ring_pages(p->sq_entries, p->cq_entries)); |
8402 | if (ret) { | |
8403 | free_uid(user); | |
8404 | return ret; | |
8405 | } | |
8406 | } | |
8407 | ||
8408 | ctx = io_ring_ctx_alloc(p); | |
8409 | if (!ctx) { | |
aad5d8da | 8410 | if (limit_mem) |
a087e2b5 | 8411 | __io_unaccount_mem(user, ring_pages(p->sq_entries, |
2b188cc1 JA |
8412 | p->cq_entries)); |
8413 | free_uid(user); | |
8414 | return -ENOMEM; | |
8415 | } | |
8416 | ctx->compat = in_compat_syscall(); | |
2b188cc1 | 8417 | ctx->user = user; |
0b8c0ec7 | 8418 | ctx->creds = get_current_cred(); |
2b188cc1 | 8419 | |
f74441e6 JA |
8420 | /* |
8421 | * Account memory _before_ installing the file descriptor. Once | |
8422 | * the descriptor is installed, it can get closed at any time. Also | |
8423 | * do this before hitting the general error path, as ring freeing | |
8424 | * will un-account as well. | |
8425 | */ | |
8426 | io_account_mem(ctx, ring_pages(p->sq_entries, p->cq_entries), | |
8427 | ACCT_LOCKED); | |
8428 | ctx->limit_mem = limit_mem; | |
8429 | ||
2b188cc1 JA |
8430 | ret = io_allocate_scq_urings(ctx, p); |
8431 | if (ret) | |
8432 | goto err; | |
8433 | ||
6c271ce2 | 8434 | ret = io_sq_offload_start(ctx, p); |
2b188cc1 JA |
8435 | if (ret) |
8436 | goto err; | |
8437 | ||
2b188cc1 | 8438 | memset(&p->sq_off, 0, sizeof(p->sq_off)); |
75b28aff HV |
8439 | p->sq_off.head = offsetof(struct io_rings, sq.head); |
8440 | p->sq_off.tail = offsetof(struct io_rings, sq.tail); | |
8441 | p->sq_off.ring_mask = offsetof(struct io_rings, sq_ring_mask); | |
8442 | p->sq_off.ring_entries = offsetof(struct io_rings, sq_ring_entries); | |
8443 | p->sq_off.flags = offsetof(struct io_rings, sq_flags); | |
8444 | p->sq_off.dropped = offsetof(struct io_rings, sq_dropped); | |
8445 | p->sq_off.array = (char *)ctx->sq_array - (char *)ctx->rings; | |
2b188cc1 JA |
8446 | |
8447 | memset(&p->cq_off, 0, sizeof(p->cq_off)); | |
75b28aff HV |
8448 | p->cq_off.head = offsetof(struct io_rings, cq.head); |
8449 | p->cq_off.tail = offsetof(struct io_rings, cq.tail); | |
8450 | p->cq_off.ring_mask = offsetof(struct io_rings, cq_ring_mask); | |
8451 | p->cq_off.ring_entries = offsetof(struct io_rings, cq_ring_entries); | |
8452 | p->cq_off.overflow = offsetof(struct io_rings, cq_overflow); | |
8453 | p->cq_off.cqes = offsetof(struct io_rings, cqes); | |
0d9b5b3a | 8454 | p->cq_off.flags = offsetof(struct io_rings, cq_flags); |
ac90f249 | 8455 | |
7f13657d XW |
8456 | p->features = IORING_FEAT_SINGLE_MMAP | IORING_FEAT_NODROP | |
8457 | IORING_FEAT_SUBMIT_STABLE | IORING_FEAT_RW_CUR_POS | | |
5769a351 JX |
8458 | IORING_FEAT_CUR_PERSONALITY | IORING_FEAT_FAST_POLL | |
8459 | IORING_FEAT_POLL_32BITS; | |
7f13657d XW |
8460 | |
8461 | if (copy_to_user(params, p, sizeof(*p))) { | |
8462 | ret = -EFAULT; | |
8463 | goto err; | |
8464 | } | |
d1719f70 | 8465 | |
044c1ab3 JA |
8466 | /* |
8467 | * Install ring fd as the very last thing, so we don't risk someone | |
8468 | * having closed it before we finish setup | |
8469 | */ | |
8470 | ret = io_uring_get_fd(ctx); | |
8471 | if (ret < 0) | |
8472 | goto err; | |
8473 | ||
c826bd7a | 8474 | trace_io_uring_create(ret, ctx, p->sq_entries, p->cq_entries, p->flags); |
2b188cc1 JA |
8475 | return ret; |
8476 | err: | |
8477 | io_ring_ctx_wait_and_kill(ctx); | |
8478 | return ret; | |
8479 | } | |
8480 | ||
8481 | /* | |
8482 | * Sets up an aio uring context, and returns the fd. Applications asks for a | |
8483 | * ring size, we return the actual sq/cq ring sizes (among other things) in the | |
8484 | * params structure passed in. | |
8485 | */ | |
8486 | static long io_uring_setup(u32 entries, struct io_uring_params __user *params) | |
8487 | { | |
8488 | struct io_uring_params p; | |
2b188cc1 JA |
8489 | int i; |
8490 | ||
8491 | if (copy_from_user(&p, params, sizeof(p))) | |
8492 | return -EFAULT; | |
8493 | for (i = 0; i < ARRAY_SIZE(p.resv); i++) { | |
8494 | if (p.resv[i]) | |
8495 | return -EINVAL; | |
8496 | } | |
8497 | ||
6c271ce2 | 8498 | if (p.flags & ~(IORING_SETUP_IOPOLL | IORING_SETUP_SQPOLL | |
8110c1a6 | 8499 | IORING_SETUP_SQ_AFF | IORING_SETUP_CQSIZE | |
24369c2e | 8500 | IORING_SETUP_CLAMP | IORING_SETUP_ATTACH_WQ)) |
2b188cc1 JA |
8501 | return -EINVAL; |
8502 | ||
7f13657d | 8503 | return io_uring_create(entries, &p, params); |
2b188cc1 JA |
8504 | } |
8505 | ||
8506 | SYSCALL_DEFINE2(io_uring_setup, u32, entries, | |
8507 | struct io_uring_params __user *, params) | |
8508 | { | |
8509 | return io_uring_setup(entries, params); | |
8510 | } | |
8511 | ||
66f4af93 JA |
8512 | static int io_probe(struct io_ring_ctx *ctx, void __user *arg, unsigned nr_args) |
8513 | { | |
8514 | struct io_uring_probe *p; | |
8515 | size_t size; | |
8516 | int i, ret; | |
8517 | ||
8518 | size = struct_size(p, ops, nr_args); | |
8519 | if (size == SIZE_MAX) | |
8520 | return -EOVERFLOW; | |
8521 | p = kzalloc(size, GFP_KERNEL); | |
8522 | if (!p) | |
8523 | return -ENOMEM; | |
8524 | ||
8525 | ret = -EFAULT; | |
8526 | if (copy_from_user(p, arg, size)) | |
8527 | goto out; | |
8528 | ret = -EINVAL; | |
8529 | if (memchr_inv(p, 0, size)) | |
8530 | goto out; | |
8531 | ||
8532 | p->last_op = IORING_OP_LAST - 1; | |
8533 | if (nr_args > IORING_OP_LAST) | |
8534 | nr_args = IORING_OP_LAST; | |
8535 | ||
8536 | for (i = 0; i < nr_args; i++) { | |
8537 | p->ops[i].op = i; | |
8538 | if (!io_op_defs[i].not_supported) | |
8539 | p->ops[i].flags = IO_URING_OP_SUPPORTED; | |
8540 | } | |
8541 | p->ops_len = i; | |
8542 | ||
8543 | ret = 0; | |
8544 | if (copy_to_user(arg, p, size)) | |
8545 | ret = -EFAULT; | |
8546 | out: | |
8547 | kfree(p); | |
8548 | return ret; | |
8549 | } | |
8550 | ||
071698e1 JA |
8551 | static int io_register_personality(struct io_ring_ctx *ctx) |
8552 | { | |
8553 | const struct cred *creds = get_current_cred(); | |
8554 | int id; | |
8555 | ||
8556 | id = idr_alloc_cyclic(&ctx->personality_idr, (void *) creds, 1, | |
8557 | USHRT_MAX, GFP_KERNEL); | |
8558 | if (id < 0) | |
8559 | put_cred(creds); | |
8560 | return id; | |
8561 | } | |
8562 | ||
8563 | static int io_unregister_personality(struct io_ring_ctx *ctx, unsigned id) | |
8564 | { | |
8565 | const struct cred *old_creds; | |
8566 | ||
8567 | old_creds = idr_remove(&ctx->personality_idr, id); | |
8568 | if (old_creds) { | |
8569 | put_cred(old_creds); | |
8570 | return 0; | |
8571 | } | |
8572 | ||
8573 | return -EINVAL; | |
8574 | } | |
8575 | ||
8576 | static bool io_register_op_must_quiesce(int op) | |
8577 | { | |
8578 | switch (op) { | |
8579 | case IORING_UNREGISTER_FILES: | |
8580 | case IORING_REGISTER_FILES_UPDATE: | |
8581 | case IORING_REGISTER_PROBE: | |
8582 | case IORING_REGISTER_PERSONALITY: | |
8583 | case IORING_UNREGISTER_PERSONALITY: | |
8584 | return false; | |
8585 | default: | |
8586 | return true; | |
8587 | } | |
8588 | } | |
8589 | ||
edafccee JA |
8590 | static int __io_uring_register(struct io_ring_ctx *ctx, unsigned opcode, |
8591 | void __user *arg, unsigned nr_args) | |
b19062a5 JA |
8592 | __releases(ctx->uring_lock) |
8593 | __acquires(ctx->uring_lock) | |
edafccee JA |
8594 | { |
8595 | int ret; | |
8596 | ||
35fa71a0 JA |
8597 | /* |
8598 | * We're inside the ring mutex, if the ref is already dying, then | |
8599 | * someone else killed the ctx or is already going through | |
8600 | * io_uring_register(). | |
8601 | */ | |
8602 | if (percpu_ref_is_dying(&ctx->refs)) | |
8603 | return -ENXIO; | |
8604 | ||
071698e1 | 8605 | if (io_register_op_must_quiesce(opcode)) { |
05f3fb3c | 8606 | percpu_ref_kill(&ctx->refs); |
b19062a5 | 8607 | |
05f3fb3c JA |
8608 | /* |
8609 | * Drop uring mutex before waiting for references to exit. If | |
8610 | * another thread is currently inside io_uring_enter() it might | |
8611 | * need to grab the uring_lock to make progress. If we hold it | |
8612 | * here across the drain wait, then we can deadlock. It's safe | |
8613 | * to drop the mutex here, since no new references will come in | |
8614 | * after we've killed the percpu ref. | |
8615 | */ | |
8616 | mutex_unlock(&ctx->uring_lock); | |
0f158b4c | 8617 | ret = wait_for_completion_interruptible(&ctx->ref_comp); |
05f3fb3c | 8618 | mutex_lock(&ctx->uring_lock); |
c150368b JA |
8619 | if (ret) { |
8620 | percpu_ref_resurrect(&ctx->refs); | |
8621 | ret = -EINTR; | |
8622 | goto out; | |
8623 | } | |
05f3fb3c | 8624 | } |
edafccee JA |
8625 | |
8626 | switch (opcode) { | |
8627 | case IORING_REGISTER_BUFFERS: | |
8628 | ret = io_sqe_buffer_register(ctx, arg, nr_args); | |
8629 | break; | |
8630 | case IORING_UNREGISTER_BUFFERS: | |
8631 | ret = -EINVAL; | |
8632 | if (arg || nr_args) | |
8633 | break; | |
8634 | ret = io_sqe_buffer_unregister(ctx); | |
8635 | break; | |
6b06314c JA |
8636 | case IORING_REGISTER_FILES: |
8637 | ret = io_sqe_files_register(ctx, arg, nr_args); | |
8638 | break; | |
8639 | case IORING_UNREGISTER_FILES: | |
8640 | ret = -EINVAL; | |
8641 | if (arg || nr_args) | |
8642 | break; | |
8643 | ret = io_sqe_files_unregister(ctx); | |
8644 | break; | |
c3a31e60 JA |
8645 | case IORING_REGISTER_FILES_UPDATE: |
8646 | ret = io_sqe_files_update(ctx, arg, nr_args); | |
8647 | break; | |
9b402849 | 8648 | case IORING_REGISTER_EVENTFD: |
f2842ab5 | 8649 | case IORING_REGISTER_EVENTFD_ASYNC: |
9b402849 JA |
8650 | ret = -EINVAL; |
8651 | if (nr_args != 1) | |
8652 | break; | |
8653 | ret = io_eventfd_register(ctx, arg); | |
f2842ab5 JA |
8654 | if (ret) |
8655 | break; | |
8656 | if (opcode == IORING_REGISTER_EVENTFD_ASYNC) | |
8657 | ctx->eventfd_async = 1; | |
8658 | else | |
8659 | ctx->eventfd_async = 0; | |
9b402849 JA |
8660 | break; |
8661 | case IORING_UNREGISTER_EVENTFD: | |
8662 | ret = -EINVAL; | |
8663 | if (arg || nr_args) | |
8664 | break; | |
8665 | ret = io_eventfd_unregister(ctx); | |
8666 | break; | |
66f4af93 JA |
8667 | case IORING_REGISTER_PROBE: |
8668 | ret = -EINVAL; | |
8669 | if (!arg || nr_args > 256) | |
8670 | break; | |
8671 | ret = io_probe(ctx, arg, nr_args); | |
8672 | break; | |
071698e1 JA |
8673 | case IORING_REGISTER_PERSONALITY: |
8674 | ret = -EINVAL; | |
8675 | if (arg || nr_args) | |
8676 | break; | |
8677 | ret = io_register_personality(ctx); | |
8678 | break; | |
8679 | case IORING_UNREGISTER_PERSONALITY: | |
8680 | ret = -EINVAL; | |
8681 | if (arg) | |
8682 | break; | |
8683 | ret = io_unregister_personality(ctx, nr_args); | |
8684 | break; | |
edafccee JA |
8685 | default: |
8686 | ret = -EINVAL; | |
8687 | break; | |
8688 | } | |
8689 | ||
071698e1 | 8690 | if (io_register_op_must_quiesce(opcode)) { |
05f3fb3c | 8691 | /* bring the ctx back to life */ |
05f3fb3c | 8692 | percpu_ref_reinit(&ctx->refs); |
c150368b | 8693 | out: |
0f158b4c | 8694 | reinit_completion(&ctx->ref_comp); |
05f3fb3c | 8695 | } |
edafccee JA |
8696 | return ret; |
8697 | } | |
8698 | ||
8699 | SYSCALL_DEFINE4(io_uring_register, unsigned int, fd, unsigned int, opcode, | |
8700 | void __user *, arg, unsigned int, nr_args) | |
8701 | { | |
8702 | struct io_ring_ctx *ctx; | |
8703 | long ret = -EBADF; | |
8704 | struct fd f; | |
8705 | ||
8706 | f = fdget(fd); | |
8707 | if (!f.file) | |
8708 | return -EBADF; | |
8709 | ||
8710 | ret = -EOPNOTSUPP; | |
8711 | if (f.file->f_op != &io_uring_fops) | |
8712 | goto out_fput; | |
8713 | ||
8714 | ctx = f.file->private_data; | |
8715 | ||
8716 | mutex_lock(&ctx->uring_lock); | |
8717 | ret = __io_uring_register(ctx, opcode, arg, nr_args); | |
8718 | mutex_unlock(&ctx->uring_lock); | |
c826bd7a DD |
8719 | trace_io_uring_register(ctx, opcode, ctx->nr_user_files, ctx->nr_user_bufs, |
8720 | ctx->cq_ev_fd != NULL, ret); | |
edafccee JA |
8721 | out_fput: |
8722 | fdput(f); | |
8723 | return ret; | |
8724 | } | |
8725 | ||
2b188cc1 JA |
8726 | static int __init io_uring_init(void) |
8727 | { | |
d7f62e82 SM |
8728 | #define __BUILD_BUG_VERIFY_ELEMENT(stype, eoffset, etype, ename) do { \ |
8729 | BUILD_BUG_ON(offsetof(stype, ename) != eoffset); \ | |
8730 | BUILD_BUG_ON(sizeof(etype) != sizeof_field(stype, ename)); \ | |
8731 | } while (0) | |
8732 | ||
8733 | #define BUILD_BUG_SQE_ELEM(eoffset, etype, ename) \ | |
8734 | __BUILD_BUG_VERIFY_ELEMENT(struct io_uring_sqe, eoffset, etype, ename) | |
8735 | BUILD_BUG_ON(sizeof(struct io_uring_sqe) != 64); | |
8736 | BUILD_BUG_SQE_ELEM(0, __u8, opcode); | |
8737 | BUILD_BUG_SQE_ELEM(1, __u8, flags); | |
8738 | BUILD_BUG_SQE_ELEM(2, __u16, ioprio); | |
8739 | BUILD_BUG_SQE_ELEM(4, __s32, fd); | |
8740 | BUILD_BUG_SQE_ELEM(8, __u64, off); | |
8741 | BUILD_BUG_SQE_ELEM(8, __u64, addr2); | |
8742 | BUILD_BUG_SQE_ELEM(16, __u64, addr); | |
7d67af2c | 8743 | BUILD_BUG_SQE_ELEM(16, __u64, splice_off_in); |
d7f62e82 SM |
8744 | BUILD_BUG_SQE_ELEM(24, __u32, len); |
8745 | BUILD_BUG_SQE_ELEM(28, __kernel_rwf_t, rw_flags); | |
8746 | BUILD_BUG_SQE_ELEM(28, /* compat */ int, rw_flags); | |
8747 | BUILD_BUG_SQE_ELEM(28, /* compat */ __u32, rw_flags); | |
8748 | BUILD_BUG_SQE_ELEM(28, __u32, fsync_flags); | |
5769a351 JX |
8749 | BUILD_BUG_SQE_ELEM(28, /* compat */ __u16, poll_events); |
8750 | BUILD_BUG_SQE_ELEM(28, __u32, poll32_events); | |
d7f62e82 SM |
8751 | BUILD_BUG_SQE_ELEM(28, __u32, sync_range_flags); |
8752 | BUILD_BUG_SQE_ELEM(28, __u32, msg_flags); | |
8753 | BUILD_BUG_SQE_ELEM(28, __u32, timeout_flags); | |
8754 | BUILD_BUG_SQE_ELEM(28, __u32, accept_flags); | |
8755 | BUILD_BUG_SQE_ELEM(28, __u32, cancel_flags); | |
8756 | BUILD_BUG_SQE_ELEM(28, __u32, open_flags); | |
8757 | BUILD_BUG_SQE_ELEM(28, __u32, statx_flags); | |
8758 | BUILD_BUG_SQE_ELEM(28, __u32, fadvise_advice); | |
7d67af2c | 8759 | BUILD_BUG_SQE_ELEM(28, __u32, splice_flags); |
d7f62e82 SM |
8760 | BUILD_BUG_SQE_ELEM(32, __u64, user_data); |
8761 | BUILD_BUG_SQE_ELEM(40, __u16, buf_index); | |
8762 | BUILD_BUG_SQE_ELEM(42, __u16, personality); | |
7d67af2c | 8763 | BUILD_BUG_SQE_ELEM(44, __s32, splice_fd_in); |
d7f62e82 | 8764 | |
d3656344 | 8765 | BUILD_BUG_ON(ARRAY_SIZE(io_op_defs) != IORING_OP_LAST); |
84557871 | 8766 | BUILD_BUG_ON(__REQ_F_LAST_BIT >= 8 * sizeof(int)); |
2b188cc1 JA |
8767 | req_cachep = KMEM_CACHE(io_kiocb, SLAB_HWCACHE_ALIGN | SLAB_PANIC); |
8768 | return 0; | |
8769 | }; | |
8770 | __initcall(io_uring_init); |