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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]; | |
ff6165b2 JA |
511 | const struct iovec *free_iovec; |
512 | struct iov_iter iter; | |
227c0c96 | 513 | size_t bytes_done; |
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); | |
ff6165b2 JA |
918 | static int io_setup_async_rw(struct io_kiocb *req, const struct iovec *iovec, |
919 | const struct iovec *fast_iov, | |
227c0c96 | 920 | struct iov_iter *iter, bool force); |
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; | |
227c0c96 | 2302 | ret = io_setup_async_rw(req, iovec, inline_vecs, &iter, false); |
b63534c4 JA |
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 | ||
227c0c96 JA |
2592 | /* add previously done IO, if any */ |
2593 | if (req->io && req->io->rw.bytes_done > 0) { | |
2594 | if (ret < 0) | |
2595 | ret = req->io->rw.bytes_done; | |
2596 | else | |
2597 | ret += req->io->rw.bytes_done; | |
2598 | } | |
2599 | ||
ba04291e JA |
2600 | if (req->flags & REQ_F_CUR_POS) |
2601 | req->file->f_pos = kiocb->ki_pos; | |
bcaec089 | 2602 | if (ret >= 0 && kiocb->ki_complete == io_complete_rw) |
a1d7c393 | 2603 | __io_complete_rw(req, ret, 0, cs); |
ba816ad6 JA |
2604 | else |
2605 | io_rw_done(kiocb, ret); | |
2606 | } | |
2607 | ||
9adbd45d | 2608 | static ssize_t io_import_fixed(struct io_kiocb *req, int rw, |
7d009165 | 2609 | struct iov_iter *iter) |
edafccee | 2610 | { |
9adbd45d JA |
2611 | struct io_ring_ctx *ctx = req->ctx; |
2612 | size_t len = req->rw.len; | |
edafccee | 2613 | struct io_mapped_ubuf *imu; |
4f4eeba8 | 2614 | u16 index, buf_index; |
edafccee JA |
2615 | size_t offset; |
2616 | u64 buf_addr; | |
2617 | ||
2618 | /* attempt to use fixed buffers without having provided iovecs */ | |
2619 | if (unlikely(!ctx->user_bufs)) | |
2620 | return -EFAULT; | |
2621 | ||
4f4eeba8 | 2622 | buf_index = req->buf_index; |
edafccee JA |
2623 | if (unlikely(buf_index >= ctx->nr_user_bufs)) |
2624 | return -EFAULT; | |
2625 | ||
2626 | index = array_index_nospec(buf_index, ctx->nr_user_bufs); | |
2627 | imu = &ctx->user_bufs[index]; | |
9adbd45d | 2628 | buf_addr = req->rw.addr; |
edafccee JA |
2629 | |
2630 | /* overflow */ | |
2631 | if (buf_addr + len < buf_addr) | |
2632 | return -EFAULT; | |
2633 | /* not inside the mapped region */ | |
2634 | if (buf_addr < imu->ubuf || buf_addr + len > imu->ubuf + imu->len) | |
2635 | return -EFAULT; | |
2636 | ||
2637 | /* | |
2638 | * May not be a start of buffer, set size appropriately | |
2639 | * and advance us to the beginning. | |
2640 | */ | |
2641 | offset = buf_addr - imu->ubuf; | |
2642 | iov_iter_bvec(iter, rw, imu->bvec, imu->nr_bvecs, offset + len); | |
bd11b3a3 JA |
2643 | |
2644 | if (offset) { | |
2645 | /* | |
2646 | * Don't use iov_iter_advance() here, as it's really slow for | |
2647 | * using the latter parts of a big fixed buffer - it iterates | |
2648 | * over each segment manually. We can cheat a bit here, because | |
2649 | * we know that: | |
2650 | * | |
2651 | * 1) it's a BVEC iter, we set it up | |
2652 | * 2) all bvecs are PAGE_SIZE in size, except potentially the | |
2653 | * first and last bvec | |
2654 | * | |
2655 | * So just find our index, and adjust the iterator afterwards. | |
2656 | * If the offset is within the first bvec (or the whole first | |
2657 | * bvec, just use iov_iter_advance(). This makes it easier | |
2658 | * since we can just skip the first segment, which may not | |
2659 | * be PAGE_SIZE aligned. | |
2660 | */ | |
2661 | const struct bio_vec *bvec = imu->bvec; | |
2662 | ||
2663 | if (offset <= bvec->bv_len) { | |
2664 | iov_iter_advance(iter, offset); | |
2665 | } else { | |
2666 | unsigned long seg_skip; | |
2667 | ||
2668 | /* skip first vec */ | |
2669 | offset -= bvec->bv_len; | |
2670 | seg_skip = 1 + (offset >> PAGE_SHIFT); | |
2671 | ||
2672 | iter->bvec = bvec + seg_skip; | |
2673 | iter->nr_segs -= seg_skip; | |
99c79f66 | 2674 | iter->count -= bvec->bv_len + offset; |
bd11b3a3 | 2675 | iter->iov_offset = offset & ~PAGE_MASK; |
bd11b3a3 JA |
2676 | } |
2677 | } | |
2678 | ||
5e559561 | 2679 | return len; |
edafccee JA |
2680 | } |
2681 | ||
bcda7baa JA |
2682 | static void io_ring_submit_unlock(struct io_ring_ctx *ctx, bool needs_lock) |
2683 | { | |
2684 | if (needs_lock) | |
2685 | mutex_unlock(&ctx->uring_lock); | |
2686 | } | |
2687 | ||
2688 | static void io_ring_submit_lock(struct io_ring_ctx *ctx, bool needs_lock) | |
2689 | { | |
2690 | /* | |
2691 | * "Normal" inline submissions always hold the uring_lock, since we | |
2692 | * grab it from the system call. Same is true for the SQPOLL offload. | |
2693 | * The only exception is when we've detached the request and issue it | |
2694 | * from an async worker thread, grab the lock for that case. | |
2695 | */ | |
2696 | if (needs_lock) | |
2697 | mutex_lock(&ctx->uring_lock); | |
2698 | } | |
2699 | ||
2700 | static struct io_buffer *io_buffer_select(struct io_kiocb *req, size_t *len, | |
2701 | int bgid, struct io_buffer *kbuf, | |
2702 | bool needs_lock) | |
2703 | { | |
2704 | struct io_buffer *head; | |
2705 | ||
2706 | if (req->flags & REQ_F_BUFFER_SELECTED) | |
2707 | return kbuf; | |
2708 | ||
2709 | io_ring_submit_lock(req->ctx, needs_lock); | |
2710 | ||
2711 | lockdep_assert_held(&req->ctx->uring_lock); | |
2712 | ||
2713 | head = idr_find(&req->ctx->io_buffer_idr, bgid); | |
2714 | if (head) { | |
2715 | if (!list_empty(&head->list)) { | |
2716 | kbuf = list_last_entry(&head->list, struct io_buffer, | |
2717 | list); | |
2718 | list_del(&kbuf->list); | |
2719 | } else { | |
2720 | kbuf = head; | |
2721 | idr_remove(&req->ctx->io_buffer_idr, bgid); | |
2722 | } | |
2723 | if (*len > kbuf->len) | |
2724 | *len = kbuf->len; | |
2725 | } else { | |
2726 | kbuf = ERR_PTR(-ENOBUFS); | |
2727 | } | |
2728 | ||
2729 | io_ring_submit_unlock(req->ctx, needs_lock); | |
2730 | ||
2731 | return kbuf; | |
2732 | } | |
2733 | ||
4d954c25 JA |
2734 | static void __user *io_rw_buffer_select(struct io_kiocb *req, size_t *len, |
2735 | bool needs_lock) | |
2736 | { | |
2737 | struct io_buffer *kbuf; | |
4f4eeba8 | 2738 | u16 bgid; |
4d954c25 JA |
2739 | |
2740 | kbuf = (struct io_buffer *) (unsigned long) req->rw.addr; | |
4f4eeba8 | 2741 | bgid = req->buf_index; |
4d954c25 JA |
2742 | kbuf = io_buffer_select(req, len, bgid, kbuf, needs_lock); |
2743 | if (IS_ERR(kbuf)) | |
2744 | return kbuf; | |
2745 | req->rw.addr = (u64) (unsigned long) kbuf; | |
2746 | req->flags |= REQ_F_BUFFER_SELECTED; | |
2747 | return u64_to_user_ptr(kbuf->addr); | |
2748 | } | |
2749 | ||
2750 | #ifdef CONFIG_COMPAT | |
2751 | static ssize_t io_compat_import(struct io_kiocb *req, struct iovec *iov, | |
2752 | bool needs_lock) | |
2753 | { | |
2754 | struct compat_iovec __user *uiov; | |
2755 | compat_ssize_t clen; | |
2756 | void __user *buf; | |
2757 | ssize_t len; | |
2758 | ||
2759 | uiov = u64_to_user_ptr(req->rw.addr); | |
2760 | if (!access_ok(uiov, sizeof(*uiov))) | |
2761 | return -EFAULT; | |
2762 | if (__get_user(clen, &uiov->iov_len)) | |
2763 | return -EFAULT; | |
2764 | if (clen < 0) | |
2765 | return -EINVAL; | |
2766 | ||
2767 | len = clen; | |
2768 | buf = io_rw_buffer_select(req, &len, needs_lock); | |
2769 | if (IS_ERR(buf)) | |
2770 | return PTR_ERR(buf); | |
2771 | iov[0].iov_base = buf; | |
2772 | iov[0].iov_len = (compat_size_t) len; | |
2773 | return 0; | |
2774 | } | |
2775 | #endif | |
2776 | ||
2777 | static ssize_t __io_iov_buffer_select(struct io_kiocb *req, struct iovec *iov, | |
2778 | bool needs_lock) | |
2779 | { | |
2780 | struct iovec __user *uiov = u64_to_user_ptr(req->rw.addr); | |
2781 | void __user *buf; | |
2782 | ssize_t len; | |
2783 | ||
2784 | if (copy_from_user(iov, uiov, sizeof(*uiov))) | |
2785 | return -EFAULT; | |
2786 | ||
2787 | len = iov[0].iov_len; | |
2788 | if (len < 0) | |
2789 | return -EINVAL; | |
2790 | buf = io_rw_buffer_select(req, &len, needs_lock); | |
2791 | if (IS_ERR(buf)) | |
2792 | return PTR_ERR(buf); | |
2793 | iov[0].iov_base = buf; | |
2794 | iov[0].iov_len = len; | |
2795 | return 0; | |
2796 | } | |
2797 | ||
2798 | static ssize_t io_iov_buffer_select(struct io_kiocb *req, struct iovec *iov, | |
2799 | bool needs_lock) | |
2800 | { | |
dddb3e26 JA |
2801 | if (req->flags & REQ_F_BUFFER_SELECTED) { |
2802 | struct io_buffer *kbuf; | |
2803 | ||
2804 | kbuf = (struct io_buffer *) (unsigned long) req->rw.addr; | |
2805 | iov[0].iov_base = u64_to_user_ptr(kbuf->addr); | |
2806 | iov[0].iov_len = kbuf->len; | |
4d954c25 | 2807 | return 0; |
dddb3e26 | 2808 | } |
4d954c25 JA |
2809 | if (!req->rw.len) |
2810 | return 0; | |
2811 | else if (req->rw.len > 1) | |
2812 | return -EINVAL; | |
2813 | ||
2814 | #ifdef CONFIG_COMPAT | |
2815 | if (req->ctx->compat) | |
2816 | return io_compat_import(req, iov, needs_lock); | |
2817 | #endif | |
2818 | ||
2819 | return __io_iov_buffer_select(req, iov, needs_lock); | |
2820 | } | |
2821 | ||
cf6fd4bd | 2822 | static ssize_t io_import_iovec(int rw, struct io_kiocb *req, |
bcda7baa JA |
2823 | struct iovec **iovec, struct iov_iter *iter, |
2824 | bool needs_lock) | |
2b188cc1 | 2825 | { |
9adbd45d JA |
2826 | void __user *buf = u64_to_user_ptr(req->rw.addr); |
2827 | size_t sqe_len = req->rw.len; | |
4d954c25 | 2828 | ssize_t ret; |
edafccee JA |
2829 | u8 opcode; |
2830 | ||
ff6165b2 JA |
2831 | if (req->io) { |
2832 | struct io_async_rw *iorw = &req->io->rw; | |
2833 | ||
2834 | *iovec = NULL; | |
2835 | return iov_iter_count(&iorw->iter); | |
2836 | } | |
2837 | ||
d625c6ee | 2838 | opcode = req->opcode; |
7d009165 | 2839 | if (opcode == IORING_OP_READ_FIXED || opcode == IORING_OP_WRITE_FIXED) { |
edafccee | 2840 | *iovec = NULL; |
9adbd45d | 2841 | return io_import_fixed(req, rw, iter); |
edafccee | 2842 | } |
2b188cc1 | 2843 | |
bcda7baa | 2844 | /* buffer index only valid with fixed read/write, or buffer select */ |
4f4eeba8 | 2845 | if (req->buf_index && !(req->flags & REQ_F_BUFFER_SELECT)) |
9adbd45d JA |
2846 | return -EINVAL; |
2847 | ||
3a6820f2 | 2848 | if (opcode == IORING_OP_READ || opcode == IORING_OP_WRITE) { |
bcda7baa | 2849 | if (req->flags & REQ_F_BUFFER_SELECT) { |
4d954c25 JA |
2850 | buf = io_rw_buffer_select(req, &sqe_len, needs_lock); |
2851 | if (IS_ERR(buf)) { | |
bcda7baa | 2852 | *iovec = NULL; |
4d954c25 | 2853 | return PTR_ERR(buf); |
bcda7baa | 2854 | } |
3f9d6441 | 2855 | req->rw.len = sqe_len; |
bcda7baa JA |
2856 | } |
2857 | ||
3a6820f2 JA |
2858 | ret = import_single_range(rw, buf, sqe_len, *iovec, iter); |
2859 | *iovec = NULL; | |
3a901598 | 2860 | return ret < 0 ? ret : sqe_len; |
3a6820f2 JA |
2861 | } |
2862 | ||
4d954c25 JA |
2863 | if (req->flags & REQ_F_BUFFER_SELECT) { |
2864 | ret = io_iov_buffer_select(req, *iovec, needs_lock); | |
3f9d6441 JA |
2865 | if (!ret) { |
2866 | ret = (*iovec)->iov_len; | |
2867 | iov_iter_init(iter, rw, *iovec, 1, ret); | |
2868 | } | |
4d954c25 JA |
2869 | *iovec = NULL; |
2870 | return ret; | |
2871 | } | |
2872 | ||
2b188cc1 | 2873 | #ifdef CONFIG_COMPAT |
cf6fd4bd | 2874 | if (req->ctx->compat) |
2b188cc1 JA |
2875 | return compat_import_iovec(rw, buf, sqe_len, UIO_FASTIOV, |
2876 | iovec, iter); | |
2877 | #endif | |
2878 | ||
2879 | return import_iovec(rw, buf, sqe_len, UIO_FASTIOV, iovec, iter); | |
2880 | } | |
2881 | ||
31b51510 | 2882 | /* |
32960613 JA |
2883 | * For files that don't have ->read_iter() and ->write_iter(), handle them |
2884 | * by looping over ->read() or ->write() manually. | |
31b51510 | 2885 | */ |
32960613 JA |
2886 | static ssize_t loop_rw_iter(int rw, struct file *file, struct kiocb *kiocb, |
2887 | struct iov_iter *iter) | |
2888 | { | |
2889 | ssize_t ret = 0; | |
2890 | ||
2891 | /* | |
2892 | * Don't support polled IO through this interface, and we can't | |
2893 | * support non-blocking either. For the latter, this just causes | |
2894 | * the kiocb to be handled from an async context. | |
2895 | */ | |
2896 | if (kiocb->ki_flags & IOCB_HIPRI) | |
2897 | return -EOPNOTSUPP; | |
2898 | if (kiocb->ki_flags & IOCB_NOWAIT) | |
2899 | return -EAGAIN; | |
2900 | ||
2901 | while (iov_iter_count(iter)) { | |
311ae9e1 | 2902 | struct iovec iovec; |
32960613 JA |
2903 | ssize_t nr; |
2904 | ||
311ae9e1 PB |
2905 | if (!iov_iter_is_bvec(iter)) { |
2906 | iovec = iov_iter_iovec(iter); | |
2907 | } else { | |
2908 | /* fixed buffers import bvec */ | |
2909 | iovec.iov_base = kmap(iter->bvec->bv_page) | |
2910 | + iter->iov_offset; | |
2911 | iovec.iov_len = min(iter->count, | |
2912 | iter->bvec->bv_len - iter->iov_offset); | |
2913 | } | |
2914 | ||
32960613 JA |
2915 | if (rw == READ) { |
2916 | nr = file->f_op->read(file, iovec.iov_base, | |
2917 | iovec.iov_len, &kiocb->ki_pos); | |
2918 | } else { | |
2919 | nr = file->f_op->write(file, iovec.iov_base, | |
2920 | iovec.iov_len, &kiocb->ki_pos); | |
2921 | } | |
2922 | ||
311ae9e1 PB |
2923 | if (iov_iter_is_bvec(iter)) |
2924 | kunmap(iter->bvec->bv_page); | |
2925 | ||
32960613 JA |
2926 | if (nr < 0) { |
2927 | if (!ret) | |
2928 | ret = nr; | |
2929 | break; | |
2930 | } | |
2931 | ret += nr; | |
2932 | if (nr != iovec.iov_len) | |
2933 | break; | |
2934 | iov_iter_advance(iter, nr); | |
2935 | } | |
2936 | ||
2937 | return ret; | |
2938 | } | |
2939 | ||
ff6165b2 JA |
2940 | static void io_req_map_rw(struct io_kiocb *req, const struct iovec *iovec, |
2941 | const struct iovec *fast_iov, struct iov_iter *iter) | |
f67676d1 | 2942 | { |
b64e3444 PB |
2943 | struct io_async_rw *rw = &req->io->rw; |
2944 | ||
ff6165b2 JA |
2945 | memcpy(&rw->iter, iter, sizeof(*iter)); |
2946 | rw->free_iovec = NULL; | |
227c0c96 | 2947 | rw->bytes_done = 0; |
ff6165b2 JA |
2948 | /* can only be fixed buffers, no need to do anything */ |
2949 | if (iter->type == ITER_BVEC) | |
2950 | return; | |
b64e3444 | 2951 | if (!iovec) { |
ff6165b2 JA |
2952 | unsigned iov_off = 0; |
2953 | ||
2954 | rw->iter.iov = rw->fast_iov; | |
2955 | if (iter->iov != fast_iov) { | |
2956 | iov_off = iter->iov - fast_iov; | |
2957 | rw->iter.iov += iov_off; | |
2958 | } | |
2959 | if (rw->fast_iov != fast_iov) | |
2960 | memcpy(rw->fast_iov + iov_off, fast_iov + iov_off, | |
45097dae | 2961 | sizeof(struct iovec) * iter->nr_segs); |
99bc4c38 | 2962 | } else { |
ff6165b2 | 2963 | rw->free_iovec = iovec; |
99bc4c38 | 2964 | req->flags |= REQ_F_NEED_CLEANUP; |
f67676d1 JA |
2965 | } |
2966 | } | |
2967 | ||
3d9932a8 XW |
2968 | static inline int __io_alloc_async_ctx(struct io_kiocb *req) |
2969 | { | |
2970 | req->io = kmalloc(sizeof(*req->io), GFP_KERNEL); | |
2971 | return req->io == NULL; | |
2972 | } | |
2973 | ||
b7bb4f7d | 2974 | static int io_alloc_async_ctx(struct io_kiocb *req) |
f67676d1 | 2975 | { |
d3656344 JA |
2976 | if (!io_op_defs[req->opcode].async_ctx) |
2977 | return 0; | |
3d9932a8 XW |
2978 | |
2979 | return __io_alloc_async_ctx(req); | |
b7bb4f7d JA |
2980 | } |
2981 | ||
ff6165b2 JA |
2982 | static int io_setup_async_rw(struct io_kiocb *req, const struct iovec *iovec, |
2983 | const struct iovec *fast_iov, | |
227c0c96 | 2984 | struct iov_iter *iter, bool force) |
b7bb4f7d | 2985 | { |
227c0c96 | 2986 | if (!force && !io_op_defs[req->opcode].async_ctx) |
74566df3 | 2987 | return 0; |
5d204bcf | 2988 | if (!req->io) { |
3d9932a8 | 2989 | if (__io_alloc_async_ctx(req)) |
5d204bcf | 2990 | return -ENOMEM; |
b7bb4f7d | 2991 | |
ff6165b2 | 2992 | io_req_map_rw(req, iovec, fast_iov, iter); |
5d204bcf | 2993 | } |
b7bb4f7d | 2994 | return 0; |
f67676d1 JA |
2995 | } |
2996 | ||
c3e330a4 PB |
2997 | static inline int io_rw_prep_async(struct io_kiocb *req, int rw, |
2998 | bool force_nonblock) | |
2999 | { | |
ff6165b2 | 3000 | struct io_async_rw *iorw = &req->io->rw; |
c3e330a4 PB |
3001 | ssize_t ret; |
3002 | ||
ff6165b2 JA |
3003 | iorw->iter.iov = iorw->fast_iov; |
3004 | /* reset ->io around the iovec import, we don't want to use it */ | |
c3e330a4 | 3005 | req->io = NULL; |
ff6165b2 JA |
3006 | ret = io_import_iovec(rw, req, (struct iovec **) &iorw->iter.iov, |
3007 | &iorw->iter, !force_nonblock); | |
3008 | req->io = container_of(iorw, struct io_async_ctx, rw); | |
c3e330a4 PB |
3009 | if (unlikely(ret < 0)) |
3010 | return ret; | |
3011 | ||
ff6165b2 | 3012 | io_req_map_rw(req, iorw->iter.iov, iorw->fast_iov, &iorw->iter); |
c3e330a4 PB |
3013 | return 0; |
3014 | } | |
3015 | ||
3529d8c2 JA |
3016 | static int io_read_prep(struct io_kiocb *req, const struct io_uring_sqe *sqe, |
3017 | bool force_nonblock) | |
f67676d1 JA |
3018 | { |
3019 | ssize_t ret; | |
3020 | ||
3529d8c2 JA |
3021 | ret = io_prep_rw(req, sqe, force_nonblock); |
3022 | if (ret) | |
3023 | return ret; | |
f67676d1 | 3024 | |
3529d8c2 JA |
3025 | if (unlikely(!(req->file->f_mode & FMODE_READ))) |
3026 | return -EBADF; | |
f67676d1 | 3027 | |
5f798bea PB |
3028 | /* either don't need iovec imported or already have it */ |
3029 | if (!req->io || req->flags & REQ_F_NEED_CLEANUP) | |
3529d8c2 | 3030 | return 0; |
c3e330a4 | 3031 | return io_rw_prep_async(req, READ, force_nonblock); |
f67676d1 JA |
3032 | } |
3033 | ||
c1dd91d1 JA |
3034 | /* |
3035 | * This is our waitqueue callback handler, registered through lock_page_async() | |
3036 | * when we initially tried to do the IO with the iocb armed our waitqueue. | |
3037 | * This gets called when the page is unlocked, and we generally expect that to | |
3038 | * happen when the page IO is completed and the page is now uptodate. This will | |
3039 | * queue a task_work based retry of the operation, attempting to copy the data | |
3040 | * again. If the latter fails because the page was NOT uptodate, then we will | |
3041 | * do a thread based blocking retry of the operation. That's the unexpected | |
3042 | * slow path. | |
3043 | */ | |
bcf5a063 JA |
3044 | static int io_async_buf_func(struct wait_queue_entry *wait, unsigned mode, |
3045 | int sync, void *arg) | |
3046 | { | |
3047 | struct wait_page_queue *wpq; | |
3048 | struct io_kiocb *req = wait->private; | |
bcf5a063 | 3049 | struct wait_page_key *key = arg; |
bcf5a063 JA |
3050 | int ret; |
3051 | ||
3052 | wpq = container_of(wait, struct wait_page_queue, wait); | |
3053 | ||
cdc8fcb4 LT |
3054 | if (!wake_page_match(wpq, key)) |
3055 | return 0; | |
3056 | ||
bcf5a063 JA |
3057 | list_del_init(&wait->entry); |
3058 | ||
e7375122 | 3059 | init_task_work(&req->task_work, io_req_task_submit); |
6d816e08 JA |
3060 | percpu_ref_get(&req->ctx->refs); |
3061 | ||
bcf5a063 JA |
3062 | /* submit ref gets dropped, acquire a new one */ |
3063 | refcount_inc(&req->refs); | |
e7375122 | 3064 | ret = io_req_task_work_add(req, &req->task_work); |
bcf5a063 | 3065 | if (unlikely(ret)) { |
c2c4c83c JA |
3066 | struct task_struct *tsk; |
3067 | ||
bcf5a063 | 3068 | /* queue just for cancelation */ |
e7375122 | 3069 | init_task_work(&req->task_work, io_req_task_cancel); |
bcf5a063 | 3070 | tsk = io_wq_get_task(req->ctx->io_wq); |
e7375122 | 3071 | task_work_add(tsk, &req->task_work, 0); |
c2c4c83c | 3072 | wake_up_process(tsk); |
bcf5a063 | 3073 | } |
bcf5a063 JA |
3074 | return 1; |
3075 | } | |
3076 | ||
cdc8fcb4 LT |
3077 | static inline int kiocb_wait_page_queue_init(struct kiocb *kiocb, |
3078 | struct wait_page_queue *wait, | |
3079 | wait_queue_func_t func, | |
3080 | void *data) | |
3081 | { | |
3082 | /* Can't support async wakeup with polled IO */ | |
3083 | if (kiocb->ki_flags & IOCB_HIPRI) | |
3084 | return -EINVAL; | |
3085 | if (kiocb->ki_filp->f_mode & FMODE_BUF_RASYNC) { | |
3086 | wait->wait.func = func; | |
3087 | wait->wait.private = data; | |
3088 | wait->wait.flags = 0; | |
3089 | INIT_LIST_HEAD(&wait->wait.entry); | |
3090 | kiocb->ki_flags |= IOCB_WAITQ; | |
3091 | kiocb->ki_waitq = wait; | |
3092 | return 0; | |
3093 | } | |
3094 | ||
3095 | return -EOPNOTSUPP; | |
f67676d1 JA |
3096 | } |
3097 | ||
c1dd91d1 JA |
3098 | /* |
3099 | * This controls whether a given IO request should be armed for async page | |
3100 | * based retry. If we return false here, the request is handed to the async | |
3101 | * worker threads for retry. If we're doing buffered reads on a regular file, | |
3102 | * we prepare a private wait_page_queue entry and retry the operation. This | |
3103 | * will either succeed because the page is now uptodate and unlocked, or it | |
3104 | * will register a callback when the page is unlocked at IO completion. Through | |
3105 | * that callback, io_uring uses task_work to setup a retry of the operation. | |
3106 | * That retry will attempt the buffered read again. The retry will generally | |
3107 | * succeed, or in rare cases where it fails, we then fall back to using the | |
3108 | * async worker threads for a blocking retry. | |
3109 | */ | |
227c0c96 | 3110 | static bool io_rw_should_retry(struct io_kiocb *req) |
f67676d1 | 3111 | { |
bcf5a063 JA |
3112 | struct kiocb *kiocb = &req->rw.kiocb; |
3113 | int ret; | |
f67676d1 | 3114 | |
bcf5a063 JA |
3115 | /* never retry for NOWAIT, we just complete with -EAGAIN */ |
3116 | if (req->flags & REQ_F_NOWAIT) | |
3117 | return false; | |
f67676d1 | 3118 | |
227c0c96 JA |
3119 | /* Only for buffered IO */ |
3120 | if (kiocb->ki_flags & IOCB_DIRECT) | |
bcf5a063 JA |
3121 | return false; |
3122 | /* | |
3123 | * just use poll if we can, and don't attempt if the fs doesn't | |
3124 | * support callback based unlocks | |
3125 | */ | |
3126 | if (file_can_poll(req->file) || !(req->file->f_mode & FMODE_BUF_RASYNC)) | |
3127 | return false; | |
f67676d1 | 3128 | |
bcf5a063 JA |
3129 | ret = kiocb_wait_page_queue_init(kiocb, &req->io->rw.wpq, |
3130 | io_async_buf_func, req); | |
3131 | if (!ret) { | |
3132 | io_get_req_task(req); | |
3133 | return true; | |
3134 | } | |
3529d8c2 | 3135 | |
bcf5a063 JA |
3136 | return false; |
3137 | } | |
3138 | ||
3139 | static int io_iter_do_read(struct io_kiocb *req, struct iov_iter *iter) | |
3140 | { | |
3141 | if (req->file->f_op->read_iter) | |
3142 | return call_read_iter(req->file, &req->rw.kiocb, iter); | |
2dd2111d GH |
3143 | else if (req->file->f_op->read) |
3144 | return loop_rw_iter(READ, req->file, &req->rw.kiocb, iter); | |
3145 | else | |
3146 | return -EINVAL; | |
f67676d1 JA |
3147 | } |
3148 | ||
a1d7c393 JA |
3149 | static int io_read(struct io_kiocb *req, bool force_nonblock, |
3150 | struct io_comp_state *cs) | |
2b188cc1 JA |
3151 | { |
3152 | struct iovec inline_vecs[UIO_FASTIOV], *iovec = inline_vecs; | |
9adbd45d | 3153 | struct kiocb *kiocb = &req->rw.kiocb; |
ff6165b2 | 3154 | struct iov_iter __iter, *iter = &__iter; |
227c0c96 | 3155 | ssize_t io_size, ret, ret2; |
31b51510 | 3156 | size_t iov_count; |
ff6165b2 JA |
3157 | |
3158 | if (req->io) | |
3159 | iter = &req->io->rw.iter; | |
2b188cc1 | 3160 | |
ff6165b2 | 3161 | ret = io_import_iovec(READ, req, &iovec, iter, !force_nonblock); |
06b76d44 JA |
3162 | if (ret < 0) |
3163 | return ret; | |
fa15bafb PB |
3164 | io_size = ret; |
3165 | req->result = io_size; | |
227c0c96 | 3166 | ret = 0; |
2b188cc1 | 3167 | |
fd6c2e4c JA |
3168 | /* Ensure we clear previously set non-block flag */ |
3169 | if (!force_nonblock) | |
29de5f6a | 3170 | kiocb->ki_flags &= ~IOCB_NOWAIT; |
fd6c2e4c | 3171 | |
24c74678 | 3172 | /* If the file doesn't support async, just async punt */ |
af197f50 | 3173 | if (force_nonblock && !io_file_supports_async(req->file, READ)) |
f67676d1 | 3174 | goto copy_iov; |
9e645e11 | 3175 | |
ff6165b2 | 3176 | iov_count = iov_iter_count(iter); |
9adbd45d | 3177 | ret = rw_verify_area(READ, req->file, &kiocb->ki_pos, iov_count); |
fa15bafb PB |
3178 | if (unlikely(ret)) |
3179 | goto out_free; | |
2b188cc1 | 3180 | |
227c0c96 | 3181 | ret = io_iter_do_read(req, iter); |
32960613 | 3182 | |
227c0c96 JA |
3183 | if (!ret) { |
3184 | goto done; | |
3185 | } else if (ret == -EIOCBQUEUED) { | |
3186 | ret = 0; | |
3187 | goto out_free; | |
3188 | } else if (ret == -EAGAIN) { | |
3189 | ret = io_setup_async_rw(req, iovec, inline_vecs, iter, false); | |
fa15bafb PB |
3190 | if (ret) |
3191 | goto out_free; | |
227c0c96 JA |
3192 | return -EAGAIN; |
3193 | } else if (ret < 0) { | |
3194 | goto out_free; | |
3195 | } | |
3196 | ||
3197 | /* read it all, or we did blocking attempt. no retry. */ | |
3198 | if (!iov_iter_count(iter) || !force_nonblock) | |
3199 | goto done; | |
3200 | ||
3201 | io_size -= ret; | |
3202 | copy_iov: | |
3203 | ret2 = io_setup_async_rw(req, iovec, inline_vecs, iter, true); | |
3204 | if (ret2) { | |
3205 | ret = ret2; | |
3206 | goto out_free; | |
3207 | } | |
3208 | /* it's copied and will be cleaned with ->io */ | |
3209 | iovec = NULL; | |
3210 | /* now use our persistent iterator, if we aren't already */ | |
3211 | iter = &req->io->rw.iter; | |
3212 | retry: | |
3213 | req->io->rw.bytes_done += ret; | |
3214 | /* if we can retry, do so with the callbacks armed */ | |
3215 | if (!io_rw_should_retry(req)) { | |
fa15bafb PB |
3216 | kiocb->ki_flags &= ~IOCB_WAITQ; |
3217 | return -EAGAIN; | |
2b188cc1 | 3218 | } |
227c0c96 JA |
3219 | |
3220 | /* | |
3221 | * Now retry read with the IOCB_WAITQ parts set in the iocb. If we | |
3222 | * get -EIOCBQUEUED, then we'll get a notification when the desired | |
3223 | * page gets unlocked. We can also get a partial read here, and if we | |
3224 | * do, then just retry at the new offset. | |
3225 | */ | |
3226 | ret = io_iter_do_read(req, iter); | |
3227 | if (ret == -EIOCBQUEUED) { | |
3228 | ret = 0; | |
3229 | goto out_free; | |
3230 | } else if (ret > 0 && ret < io_size) { | |
3231 | /* we got some bytes, but not all. retry. */ | |
3232 | goto retry; | |
3233 | } | |
3234 | done: | |
3235 | kiocb_done(kiocb, ret, cs); | |
3236 | ret = 0; | |
f67676d1 | 3237 | out_free: |
252917c3 | 3238 | if (iovec) |
6f2cc166 | 3239 | kfree(iovec); |
2b188cc1 JA |
3240 | return ret; |
3241 | } | |
3242 | ||
3529d8c2 JA |
3243 | static int io_write_prep(struct io_kiocb *req, const struct io_uring_sqe *sqe, |
3244 | bool force_nonblock) | |
f67676d1 JA |
3245 | { |
3246 | ssize_t ret; | |
3247 | ||
3529d8c2 JA |
3248 | ret = io_prep_rw(req, sqe, force_nonblock); |
3249 | if (ret) | |
3250 | return ret; | |
f67676d1 | 3251 | |
3529d8c2 JA |
3252 | if (unlikely(!(req->file->f_mode & FMODE_WRITE))) |
3253 | return -EBADF; | |
f67676d1 | 3254 | |
5f798bea PB |
3255 | /* either don't need iovec imported or already have it */ |
3256 | if (!req->io || req->flags & REQ_F_NEED_CLEANUP) | |
3529d8c2 | 3257 | return 0; |
c3e330a4 | 3258 | return io_rw_prep_async(req, WRITE, force_nonblock); |
f67676d1 JA |
3259 | } |
3260 | ||
a1d7c393 JA |
3261 | static int io_write(struct io_kiocb *req, bool force_nonblock, |
3262 | struct io_comp_state *cs) | |
2b188cc1 JA |
3263 | { |
3264 | struct iovec inline_vecs[UIO_FASTIOV], *iovec = inline_vecs; | |
9adbd45d | 3265 | struct kiocb *kiocb = &req->rw.kiocb; |
ff6165b2 | 3266 | struct iov_iter __iter, *iter = &__iter; |
31b51510 | 3267 | size_t iov_count; |
fa15bafb | 3268 | ssize_t ret, ret2, io_size; |
2b188cc1 | 3269 | |
ff6165b2 JA |
3270 | if (req->io) |
3271 | iter = &req->io->rw.iter; | |
3272 | ||
3273 | ret = io_import_iovec(WRITE, req, &iovec, iter, !force_nonblock); | |
06b76d44 JA |
3274 | if (ret < 0) |
3275 | return ret; | |
fa15bafb PB |
3276 | io_size = ret; |
3277 | req->result = io_size; | |
2b188cc1 | 3278 | |
fd6c2e4c JA |
3279 | /* Ensure we clear previously set non-block flag */ |
3280 | if (!force_nonblock) | |
9adbd45d | 3281 | req->rw.kiocb.ki_flags &= ~IOCB_NOWAIT; |
fd6c2e4c | 3282 | |
24c74678 | 3283 | /* If the file doesn't support async, just async punt */ |
af197f50 | 3284 | if (force_nonblock && !io_file_supports_async(req->file, WRITE)) |
f67676d1 | 3285 | goto copy_iov; |
31b51510 | 3286 | |
10d59345 JA |
3287 | /* file path doesn't support NOWAIT for non-direct_IO */ |
3288 | if (force_nonblock && !(kiocb->ki_flags & IOCB_DIRECT) && | |
3289 | (req->flags & REQ_F_ISREG)) | |
f67676d1 | 3290 | goto copy_iov; |
31b51510 | 3291 | |
ff6165b2 | 3292 | iov_count = iov_iter_count(iter); |
9adbd45d | 3293 | ret = rw_verify_area(WRITE, req->file, &kiocb->ki_pos, iov_count); |
fa15bafb PB |
3294 | if (unlikely(ret)) |
3295 | goto out_free; | |
4ed734b0 | 3296 | |
fa15bafb PB |
3297 | /* |
3298 | * Open-code file_start_write here to grab freeze protection, | |
3299 | * which will be released by another thread in | |
3300 | * io_complete_rw(). Fool lockdep by telling it the lock got | |
3301 | * released so that it doesn't complain about the held lock when | |
3302 | * we return to userspace. | |
3303 | */ | |
3304 | if (req->flags & REQ_F_ISREG) { | |
3305 | __sb_start_write(file_inode(req->file)->i_sb, | |
3306 | SB_FREEZE_WRITE, true); | |
3307 | __sb_writers_release(file_inode(req->file)->i_sb, | |
3308 | SB_FREEZE_WRITE); | |
3309 | } | |
3310 | kiocb->ki_flags |= IOCB_WRITE; | |
4ed734b0 | 3311 | |
fa15bafb | 3312 | if (req->file->f_op->write_iter) |
ff6165b2 | 3313 | ret2 = call_write_iter(req->file, kiocb, iter); |
2dd2111d | 3314 | else if (req->file->f_op->write) |
ff6165b2 | 3315 | ret2 = loop_rw_iter(WRITE, req->file, kiocb, iter); |
2dd2111d GH |
3316 | else |
3317 | ret2 = -EINVAL; | |
4ed734b0 | 3318 | |
fa15bafb PB |
3319 | /* |
3320 | * Raw bdev writes will return -EOPNOTSUPP for IOCB_NOWAIT. Just | |
3321 | * retry them without IOCB_NOWAIT. | |
3322 | */ | |
3323 | if (ret2 == -EOPNOTSUPP && (kiocb->ki_flags & IOCB_NOWAIT)) | |
3324 | ret2 = -EAGAIN; | |
3325 | if (!force_nonblock || ret2 != -EAGAIN) { | |
3326 | kiocb_done(kiocb, ret2, cs); | |
3327 | } else { | |
f67676d1 | 3328 | copy_iov: |
227c0c96 | 3329 | ret = io_setup_async_rw(req, iovec, inline_vecs, iter, false); |
ff6165b2 JA |
3330 | if (!ret) |
3331 | return -EAGAIN; | |
2b188cc1 | 3332 | } |
31b51510 | 3333 | out_free: |
252917c3 | 3334 | if (iovec) |
6f2cc166 | 3335 | kfree(iovec); |
2b188cc1 JA |
3336 | return ret; |
3337 | } | |
3338 | ||
f2a8d5c7 PB |
3339 | static int __io_splice_prep(struct io_kiocb *req, |
3340 | const struct io_uring_sqe *sqe) | |
7d67af2c PB |
3341 | { |
3342 | struct io_splice* sp = &req->splice; | |
3343 | unsigned int valid_flags = SPLICE_F_FD_IN_FIXED | SPLICE_F_ALL; | |
3344 | int ret; | |
3345 | ||
3346 | if (req->flags & REQ_F_NEED_CLEANUP) | |
3347 | return 0; | |
3232dd02 PB |
3348 | if (unlikely(req->ctx->flags & IORING_SETUP_IOPOLL)) |
3349 | return -EINVAL; | |
7d67af2c PB |
3350 | |
3351 | sp->file_in = NULL; | |
7d67af2c PB |
3352 | sp->len = READ_ONCE(sqe->len); |
3353 | sp->flags = READ_ONCE(sqe->splice_flags); | |
3354 | ||
3355 | if (unlikely(sp->flags & ~valid_flags)) | |
3356 | return -EINVAL; | |
3357 | ||
3358 | ret = io_file_get(NULL, req, READ_ONCE(sqe->splice_fd_in), &sp->file_in, | |
3359 | (sp->flags & SPLICE_F_FD_IN_FIXED)); | |
3360 | if (ret) | |
3361 | return ret; | |
3362 | req->flags |= REQ_F_NEED_CLEANUP; | |
3363 | ||
7cdaf587 XW |
3364 | if (!S_ISREG(file_inode(sp->file_in)->i_mode)) { |
3365 | /* | |
3366 | * Splice operation will be punted aync, and here need to | |
3367 | * modify io_wq_work.flags, so initialize io_wq_work firstly. | |
3368 | */ | |
3369 | io_req_init_async(req); | |
7d67af2c | 3370 | req->work.flags |= IO_WQ_WORK_UNBOUND; |
7cdaf587 | 3371 | } |
7d67af2c PB |
3372 | |
3373 | return 0; | |
3374 | } | |
3375 | ||
f2a8d5c7 PB |
3376 | static int io_tee_prep(struct io_kiocb *req, |
3377 | const struct io_uring_sqe *sqe) | |
3378 | { | |
3379 | if (READ_ONCE(sqe->splice_off_in) || READ_ONCE(sqe->off)) | |
3380 | return -EINVAL; | |
3381 | return __io_splice_prep(req, sqe); | |
3382 | } | |
3383 | ||
3384 | static int io_tee(struct io_kiocb *req, bool force_nonblock) | |
3385 | { | |
3386 | struct io_splice *sp = &req->splice; | |
3387 | struct file *in = sp->file_in; | |
3388 | struct file *out = sp->file_out; | |
3389 | unsigned int flags = sp->flags & ~SPLICE_F_FD_IN_FIXED; | |
3390 | long ret = 0; | |
3391 | ||
3392 | if (force_nonblock) | |
3393 | return -EAGAIN; | |
3394 | if (sp->len) | |
3395 | ret = do_tee(in, out, sp->len, flags); | |
3396 | ||
3397 | io_put_file(req, in, (sp->flags & SPLICE_F_FD_IN_FIXED)); | |
3398 | req->flags &= ~REQ_F_NEED_CLEANUP; | |
3399 | ||
f2a8d5c7 PB |
3400 | if (ret != sp->len) |
3401 | req_set_fail_links(req); | |
e1e16097 | 3402 | io_req_complete(req, ret); |
f2a8d5c7 PB |
3403 | return 0; |
3404 | } | |
3405 | ||
3406 | static int io_splice_prep(struct io_kiocb *req, const struct io_uring_sqe *sqe) | |
3407 | { | |
3408 | struct io_splice* sp = &req->splice; | |
3409 | ||
3410 | sp->off_in = READ_ONCE(sqe->splice_off_in); | |
3411 | sp->off_out = READ_ONCE(sqe->off); | |
3412 | return __io_splice_prep(req, sqe); | |
3413 | } | |
3414 | ||
014db007 | 3415 | static int io_splice(struct io_kiocb *req, bool force_nonblock) |
7d67af2c PB |
3416 | { |
3417 | struct io_splice *sp = &req->splice; | |
3418 | struct file *in = sp->file_in; | |
3419 | struct file *out = sp->file_out; | |
3420 | unsigned int flags = sp->flags & ~SPLICE_F_FD_IN_FIXED; | |
3421 | loff_t *poff_in, *poff_out; | |
c9687426 | 3422 | long ret = 0; |
7d67af2c | 3423 | |
2fb3e822 PB |
3424 | if (force_nonblock) |
3425 | return -EAGAIN; | |
7d67af2c PB |
3426 | |
3427 | poff_in = (sp->off_in == -1) ? NULL : &sp->off_in; | |
3428 | poff_out = (sp->off_out == -1) ? NULL : &sp->off_out; | |
c9687426 | 3429 | |
948a7749 | 3430 | if (sp->len) |
c9687426 | 3431 | ret = do_splice(in, poff_in, out, poff_out, sp->len, flags); |
7d67af2c PB |
3432 | |
3433 | io_put_file(req, in, (sp->flags & SPLICE_F_FD_IN_FIXED)); | |
3434 | req->flags &= ~REQ_F_NEED_CLEANUP; | |
3435 | ||
7d67af2c PB |
3436 | if (ret != sp->len) |
3437 | req_set_fail_links(req); | |
e1e16097 | 3438 | io_req_complete(req, ret); |
7d67af2c PB |
3439 | return 0; |
3440 | } | |
3441 | ||
2b188cc1 JA |
3442 | /* |
3443 | * IORING_OP_NOP just posts a completion event, nothing else. | |
3444 | */ | |
229a7b63 | 3445 | static int io_nop(struct io_kiocb *req, struct io_comp_state *cs) |
2b188cc1 JA |
3446 | { |
3447 | struct io_ring_ctx *ctx = req->ctx; | |
2b188cc1 | 3448 | |
def596e9 JA |
3449 | if (unlikely(ctx->flags & IORING_SETUP_IOPOLL)) |
3450 | return -EINVAL; | |
3451 | ||
229a7b63 | 3452 | __io_req_complete(req, 0, 0, cs); |
2b188cc1 JA |
3453 | return 0; |
3454 | } | |
3455 | ||
3529d8c2 | 3456 | static int io_prep_fsync(struct io_kiocb *req, const struct io_uring_sqe *sqe) |
c992fe29 | 3457 | { |
6b06314c | 3458 | struct io_ring_ctx *ctx = req->ctx; |
c992fe29 | 3459 | |
09bb8394 JA |
3460 | if (!req->file) |
3461 | return -EBADF; | |
c992fe29 | 3462 | |
6b06314c | 3463 | if (unlikely(ctx->flags & IORING_SETUP_IOPOLL)) |
def596e9 | 3464 | return -EINVAL; |
edafccee | 3465 | if (unlikely(sqe->addr || sqe->ioprio || sqe->buf_index)) |
c992fe29 CH |
3466 | return -EINVAL; |
3467 | ||
8ed8d3c3 JA |
3468 | req->sync.flags = READ_ONCE(sqe->fsync_flags); |
3469 | if (unlikely(req->sync.flags & ~IORING_FSYNC_DATASYNC)) | |
3470 | return -EINVAL; | |
3471 | ||
3472 | req->sync.off = READ_ONCE(sqe->off); | |
3473 | req->sync.len = READ_ONCE(sqe->len); | |
c992fe29 CH |
3474 | return 0; |
3475 | } | |
3476 | ||
ac45abc0 | 3477 | static int io_fsync(struct io_kiocb *req, bool force_nonblock) |
8ed8d3c3 | 3478 | { |
8ed8d3c3 | 3479 | loff_t end = req->sync.off + req->sync.len; |
8ed8d3c3 JA |
3480 | int ret; |
3481 | ||
ac45abc0 PB |
3482 | /* fsync always requires a blocking context */ |
3483 | if (force_nonblock) | |
3484 | return -EAGAIN; | |
3485 | ||
9adbd45d | 3486 | ret = vfs_fsync_range(req->file, req->sync.off, |
8ed8d3c3 JA |
3487 | end > 0 ? end : LLONG_MAX, |
3488 | req->sync.flags & IORING_FSYNC_DATASYNC); | |
3489 | if (ret < 0) | |
3490 | req_set_fail_links(req); | |
e1e16097 | 3491 | io_req_complete(req, ret); |
c992fe29 CH |
3492 | return 0; |
3493 | } | |
3494 | ||
d63d1b5e JA |
3495 | static int io_fallocate_prep(struct io_kiocb *req, |
3496 | const struct io_uring_sqe *sqe) | |
3497 | { | |
3498 | if (sqe->ioprio || sqe->buf_index || sqe->rw_flags) | |
3499 | return -EINVAL; | |
3232dd02 PB |
3500 | if (unlikely(req->ctx->flags & IORING_SETUP_IOPOLL)) |
3501 | return -EINVAL; | |
d63d1b5e JA |
3502 | |
3503 | req->sync.off = READ_ONCE(sqe->off); | |
3504 | req->sync.len = READ_ONCE(sqe->addr); | |
3505 | req->sync.mode = READ_ONCE(sqe->len); | |
3506 | return 0; | |
3507 | } | |
3508 | ||
014db007 | 3509 | static int io_fallocate(struct io_kiocb *req, bool force_nonblock) |
5d17b4a4 | 3510 | { |
ac45abc0 PB |
3511 | int ret; |
3512 | ||
d63d1b5e | 3513 | /* fallocate always requiring blocking context */ |
ac45abc0 | 3514 | if (force_nonblock) |
5d17b4a4 | 3515 | return -EAGAIN; |
ac45abc0 PB |
3516 | ret = vfs_fallocate(req->file, req->sync.mode, req->sync.off, |
3517 | req->sync.len); | |
ac45abc0 PB |
3518 | if (ret < 0) |
3519 | req_set_fail_links(req); | |
e1e16097 | 3520 | io_req_complete(req, ret); |
5d17b4a4 JA |
3521 | return 0; |
3522 | } | |
3523 | ||
ec65fea5 | 3524 | static int __io_openat_prep(struct io_kiocb *req, const struct io_uring_sqe *sqe) |
b7bb4f7d | 3525 | { |
f8748881 | 3526 | const char __user *fname; |
15b71abe | 3527 | int ret; |
b7bb4f7d | 3528 | |
3232dd02 | 3529 | if (unlikely(req->ctx->flags & (IORING_SETUP_IOPOLL|IORING_SETUP_SQPOLL))) |
15b71abe | 3530 | return -EINVAL; |
ec65fea5 | 3531 | if (unlikely(sqe->ioprio || sqe->buf_index)) |
15b71abe | 3532 | return -EINVAL; |
ec65fea5 | 3533 | if (unlikely(req->flags & REQ_F_FIXED_FILE)) |
cf3040ca | 3534 | return -EBADF; |
03b1230c | 3535 | |
ec65fea5 PB |
3536 | /* open.how should be already initialised */ |
3537 | if (!(req->open.how.flags & O_PATH) && force_o_largefile()) | |
08a1d26e | 3538 | req->open.how.flags |= O_LARGEFILE; |
3529d8c2 | 3539 | |
25e72d10 PB |
3540 | req->open.dfd = READ_ONCE(sqe->fd); |
3541 | fname = u64_to_user_ptr(READ_ONCE(sqe->addr)); | |
f8748881 | 3542 | req->open.filename = getname(fname); |
15b71abe JA |
3543 | if (IS_ERR(req->open.filename)) { |
3544 | ret = PTR_ERR(req->open.filename); | |
3545 | req->open.filename = NULL; | |
3546 | return ret; | |
3547 | } | |
4022e7af | 3548 | req->open.nofile = rlimit(RLIMIT_NOFILE); |
8fef80bf | 3549 | req->flags |= REQ_F_NEED_CLEANUP; |
15b71abe | 3550 | return 0; |
03b1230c JA |
3551 | } |
3552 | ||
ec65fea5 PB |
3553 | static int io_openat_prep(struct io_kiocb *req, const struct io_uring_sqe *sqe) |
3554 | { | |
3555 | u64 flags, mode; | |
3556 | ||
3557 | if (req->flags & REQ_F_NEED_CLEANUP) | |
3558 | return 0; | |
3559 | mode = READ_ONCE(sqe->len); | |
3560 | flags = READ_ONCE(sqe->open_flags); | |
3561 | req->open.how = build_open_how(flags, mode); | |
3562 | return __io_openat_prep(req, sqe); | |
3563 | } | |
3564 | ||
cebdb986 | 3565 | static int io_openat2_prep(struct io_kiocb *req, const struct io_uring_sqe *sqe) |
aa1fa28f | 3566 | { |
cebdb986 | 3567 | struct open_how __user *how; |
cebdb986 | 3568 | size_t len; |
0fa03c62 JA |
3569 | int ret; |
3570 | ||
0bdbdd08 PB |
3571 | if (req->flags & REQ_F_NEED_CLEANUP) |
3572 | return 0; | |
cebdb986 JA |
3573 | how = u64_to_user_ptr(READ_ONCE(sqe->addr2)); |
3574 | len = READ_ONCE(sqe->len); | |
cebdb986 JA |
3575 | if (len < OPEN_HOW_SIZE_VER0) |
3576 | return -EINVAL; | |
3529d8c2 | 3577 | |
cebdb986 JA |
3578 | ret = copy_struct_from_user(&req->open.how, sizeof(req->open.how), how, |
3579 | len); | |
3580 | if (ret) | |
3581 | return ret; | |
3529d8c2 | 3582 | |
ec65fea5 | 3583 | return __io_openat_prep(req, sqe); |
cebdb986 JA |
3584 | } |
3585 | ||
014db007 | 3586 | static int io_openat2(struct io_kiocb *req, bool force_nonblock) |
15b71abe JA |
3587 | { |
3588 | struct open_flags op; | |
15b71abe JA |
3589 | struct file *file; |
3590 | int ret; | |
3591 | ||
f86cd20c | 3592 | if (force_nonblock) |
15b71abe | 3593 | return -EAGAIN; |
15b71abe | 3594 | |
cebdb986 | 3595 | ret = build_open_flags(&req->open.how, &op); |
15b71abe JA |
3596 | if (ret) |
3597 | goto err; | |
3598 | ||
4022e7af | 3599 | ret = __get_unused_fd_flags(req->open.how.flags, req->open.nofile); |
15b71abe JA |
3600 | if (ret < 0) |
3601 | goto err; | |
3602 | ||
3603 | file = do_filp_open(req->open.dfd, req->open.filename, &op); | |
3604 | if (IS_ERR(file)) { | |
3605 | put_unused_fd(ret); | |
3606 | ret = PTR_ERR(file); | |
3607 | } else { | |
3608 | fsnotify_open(file); | |
3609 | fd_install(ret, file); | |
3610 | } | |
3611 | err: | |
3612 | putname(req->open.filename); | |
8fef80bf | 3613 | req->flags &= ~REQ_F_NEED_CLEANUP; |
15b71abe JA |
3614 | if (ret < 0) |
3615 | req_set_fail_links(req); | |
e1e16097 | 3616 | io_req_complete(req, ret); |
15b71abe JA |
3617 | return 0; |
3618 | } | |
3619 | ||
014db007 | 3620 | static int io_openat(struct io_kiocb *req, bool force_nonblock) |
cebdb986 | 3621 | { |
014db007 | 3622 | return io_openat2(req, force_nonblock); |
cebdb986 JA |
3623 | } |
3624 | ||
067524e9 JA |
3625 | static int io_remove_buffers_prep(struct io_kiocb *req, |
3626 | const struct io_uring_sqe *sqe) | |
3627 | { | |
3628 | struct io_provide_buf *p = &req->pbuf; | |
3629 | u64 tmp; | |
3630 | ||
3631 | if (sqe->ioprio || sqe->rw_flags || sqe->addr || sqe->len || sqe->off) | |
3632 | return -EINVAL; | |
3633 | ||
3634 | tmp = READ_ONCE(sqe->fd); | |
3635 | if (!tmp || tmp > USHRT_MAX) | |
3636 | return -EINVAL; | |
3637 | ||
3638 | memset(p, 0, sizeof(*p)); | |
3639 | p->nbufs = tmp; | |
3640 | p->bgid = READ_ONCE(sqe->buf_group); | |
3641 | return 0; | |
3642 | } | |
3643 | ||
3644 | static int __io_remove_buffers(struct io_ring_ctx *ctx, struct io_buffer *buf, | |
3645 | int bgid, unsigned nbufs) | |
3646 | { | |
3647 | unsigned i = 0; | |
3648 | ||
3649 | /* shouldn't happen */ | |
3650 | if (!nbufs) | |
3651 | return 0; | |
3652 | ||
3653 | /* the head kbuf is the list itself */ | |
3654 | while (!list_empty(&buf->list)) { | |
3655 | struct io_buffer *nxt; | |
3656 | ||
3657 | nxt = list_first_entry(&buf->list, struct io_buffer, list); | |
3658 | list_del(&nxt->list); | |
3659 | kfree(nxt); | |
3660 | if (++i == nbufs) | |
3661 | return i; | |
3662 | } | |
3663 | i++; | |
3664 | kfree(buf); | |
3665 | idr_remove(&ctx->io_buffer_idr, bgid); | |
3666 | ||
3667 | return i; | |
3668 | } | |
3669 | ||
229a7b63 JA |
3670 | static int io_remove_buffers(struct io_kiocb *req, bool force_nonblock, |
3671 | struct io_comp_state *cs) | |
067524e9 JA |
3672 | { |
3673 | struct io_provide_buf *p = &req->pbuf; | |
3674 | struct io_ring_ctx *ctx = req->ctx; | |
3675 | struct io_buffer *head; | |
3676 | int ret = 0; | |
3677 | ||
3678 | io_ring_submit_lock(ctx, !force_nonblock); | |
3679 | ||
3680 | lockdep_assert_held(&ctx->uring_lock); | |
3681 | ||
3682 | ret = -ENOENT; | |
3683 | head = idr_find(&ctx->io_buffer_idr, p->bgid); | |
3684 | if (head) | |
3685 | ret = __io_remove_buffers(ctx, head, p->bgid, p->nbufs); | |
3686 | ||
3687 | io_ring_submit_lock(ctx, !force_nonblock); | |
3688 | if (ret < 0) | |
3689 | req_set_fail_links(req); | |
229a7b63 | 3690 | __io_req_complete(req, ret, 0, cs); |
067524e9 JA |
3691 | return 0; |
3692 | } | |
3693 | ||
ddf0322d JA |
3694 | static int io_provide_buffers_prep(struct io_kiocb *req, |
3695 | const struct io_uring_sqe *sqe) | |
3696 | { | |
3697 | struct io_provide_buf *p = &req->pbuf; | |
3698 | u64 tmp; | |
3699 | ||
3700 | if (sqe->ioprio || sqe->rw_flags) | |
3701 | return -EINVAL; | |
3702 | ||
3703 | tmp = READ_ONCE(sqe->fd); | |
3704 | if (!tmp || tmp > USHRT_MAX) | |
3705 | return -E2BIG; | |
3706 | p->nbufs = tmp; | |
3707 | p->addr = READ_ONCE(sqe->addr); | |
3708 | p->len = READ_ONCE(sqe->len); | |
3709 | ||
efe68c1c | 3710 | if (!access_ok(u64_to_user_ptr(p->addr), (p->len * p->nbufs))) |
ddf0322d JA |
3711 | return -EFAULT; |
3712 | ||
3713 | p->bgid = READ_ONCE(sqe->buf_group); | |
3714 | tmp = READ_ONCE(sqe->off); | |
3715 | if (tmp > USHRT_MAX) | |
3716 | return -E2BIG; | |
3717 | p->bid = tmp; | |
3718 | return 0; | |
3719 | } | |
3720 | ||
3721 | static int io_add_buffers(struct io_provide_buf *pbuf, struct io_buffer **head) | |
3722 | { | |
3723 | struct io_buffer *buf; | |
3724 | u64 addr = pbuf->addr; | |
3725 | int i, bid = pbuf->bid; | |
3726 | ||
3727 | for (i = 0; i < pbuf->nbufs; i++) { | |
3728 | buf = kmalloc(sizeof(*buf), GFP_KERNEL); | |
3729 | if (!buf) | |
3730 | break; | |
3731 | ||
3732 | buf->addr = addr; | |
3733 | buf->len = pbuf->len; | |
3734 | buf->bid = bid; | |
3735 | addr += pbuf->len; | |
3736 | bid++; | |
3737 | if (!*head) { | |
3738 | INIT_LIST_HEAD(&buf->list); | |
3739 | *head = buf; | |
3740 | } else { | |
3741 | list_add_tail(&buf->list, &(*head)->list); | |
3742 | } | |
3743 | } | |
3744 | ||
3745 | return i ? i : -ENOMEM; | |
3746 | } | |
3747 | ||
229a7b63 JA |
3748 | static int io_provide_buffers(struct io_kiocb *req, bool force_nonblock, |
3749 | struct io_comp_state *cs) | |
ddf0322d JA |
3750 | { |
3751 | struct io_provide_buf *p = &req->pbuf; | |
3752 | struct io_ring_ctx *ctx = req->ctx; | |
3753 | struct io_buffer *head, *list; | |
3754 | int ret = 0; | |
3755 | ||
3756 | io_ring_submit_lock(ctx, !force_nonblock); | |
3757 | ||
3758 | lockdep_assert_held(&ctx->uring_lock); | |
3759 | ||
3760 | list = head = idr_find(&ctx->io_buffer_idr, p->bgid); | |
3761 | ||
3762 | ret = io_add_buffers(p, &head); | |
3763 | if (ret < 0) | |
3764 | goto out; | |
3765 | ||
3766 | if (!list) { | |
3767 | ret = idr_alloc(&ctx->io_buffer_idr, head, p->bgid, p->bgid + 1, | |
3768 | GFP_KERNEL); | |
3769 | if (ret < 0) { | |
067524e9 | 3770 | __io_remove_buffers(ctx, head, p->bgid, -1U); |
ddf0322d JA |
3771 | goto out; |
3772 | } | |
3773 | } | |
3774 | out: | |
3775 | io_ring_submit_unlock(ctx, !force_nonblock); | |
3776 | if (ret < 0) | |
3777 | req_set_fail_links(req); | |
229a7b63 | 3778 | __io_req_complete(req, ret, 0, cs); |
ddf0322d | 3779 | return 0; |
cebdb986 JA |
3780 | } |
3781 | ||
3e4827b0 JA |
3782 | static int io_epoll_ctl_prep(struct io_kiocb *req, |
3783 | const struct io_uring_sqe *sqe) | |
3784 | { | |
3785 | #if defined(CONFIG_EPOLL) | |
3786 | if (sqe->ioprio || sqe->buf_index) | |
3787 | return -EINVAL; | |
3232dd02 PB |
3788 | if (unlikely(req->ctx->flags & IORING_SETUP_IOPOLL)) |
3789 | return -EINVAL; | |
3e4827b0 JA |
3790 | |
3791 | req->epoll.epfd = READ_ONCE(sqe->fd); | |
3792 | req->epoll.op = READ_ONCE(sqe->len); | |
3793 | req->epoll.fd = READ_ONCE(sqe->off); | |
3794 | ||
3795 | if (ep_op_has_event(req->epoll.op)) { | |
3796 | struct epoll_event __user *ev; | |
3797 | ||
3798 | ev = u64_to_user_ptr(READ_ONCE(sqe->addr)); | |
3799 | if (copy_from_user(&req->epoll.event, ev, sizeof(*ev))) | |
3800 | return -EFAULT; | |
3801 | } | |
3802 | ||
3803 | return 0; | |
3804 | #else | |
3805 | return -EOPNOTSUPP; | |
3806 | #endif | |
3807 | } | |
3808 | ||
229a7b63 JA |
3809 | static int io_epoll_ctl(struct io_kiocb *req, bool force_nonblock, |
3810 | struct io_comp_state *cs) | |
3e4827b0 JA |
3811 | { |
3812 | #if defined(CONFIG_EPOLL) | |
3813 | struct io_epoll *ie = &req->epoll; | |
3814 | int ret; | |
3815 | ||
3816 | ret = do_epoll_ctl(ie->epfd, ie->op, ie->fd, &ie->event, force_nonblock); | |
3817 | if (force_nonblock && ret == -EAGAIN) | |
3818 | return -EAGAIN; | |
3819 | ||
3820 | if (ret < 0) | |
3821 | req_set_fail_links(req); | |
229a7b63 | 3822 | __io_req_complete(req, ret, 0, cs); |
3e4827b0 JA |
3823 | return 0; |
3824 | #else | |
3825 | return -EOPNOTSUPP; | |
3826 | #endif | |
3827 | } | |
3828 | ||
c1ca757b JA |
3829 | static int io_madvise_prep(struct io_kiocb *req, const struct io_uring_sqe *sqe) |
3830 | { | |
3831 | #if defined(CONFIG_ADVISE_SYSCALLS) && defined(CONFIG_MMU) | |
3832 | if (sqe->ioprio || sqe->buf_index || sqe->off) | |
3833 | return -EINVAL; | |
3232dd02 PB |
3834 | if (unlikely(req->ctx->flags & IORING_SETUP_IOPOLL)) |
3835 | return -EINVAL; | |
c1ca757b JA |
3836 | |
3837 | req->madvise.addr = READ_ONCE(sqe->addr); | |
3838 | req->madvise.len = READ_ONCE(sqe->len); | |
3839 | req->madvise.advice = READ_ONCE(sqe->fadvise_advice); | |
3840 | return 0; | |
3841 | #else | |
3842 | return -EOPNOTSUPP; | |
3843 | #endif | |
3844 | } | |
3845 | ||
014db007 | 3846 | static int io_madvise(struct io_kiocb *req, bool force_nonblock) |
c1ca757b JA |
3847 | { |
3848 | #if defined(CONFIG_ADVISE_SYSCALLS) && defined(CONFIG_MMU) | |
3849 | struct io_madvise *ma = &req->madvise; | |
3850 | int ret; | |
3851 | ||
3852 | if (force_nonblock) | |
3853 | return -EAGAIN; | |
3854 | ||
3855 | ret = do_madvise(ma->addr, ma->len, ma->advice); | |
3856 | if (ret < 0) | |
3857 | req_set_fail_links(req); | |
e1e16097 | 3858 | io_req_complete(req, ret); |
c1ca757b JA |
3859 | return 0; |
3860 | #else | |
3861 | return -EOPNOTSUPP; | |
3862 | #endif | |
3863 | } | |
3864 | ||
4840e418 JA |
3865 | static int io_fadvise_prep(struct io_kiocb *req, const struct io_uring_sqe *sqe) |
3866 | { | |
3867 | if (sqe->ioprio || sqe->buf_index || sqe->addr) | |
3868 | return -EINVAL; | |
3232dd02 PB |
3869 | if (unlikely(req->ctx->flags & IORING_SETUP_IOPOLL)) |
3870 | return -EINVAL; | |
4840e418 JA |
3871 | |
3872 | req->fadvise.offset = READ_ONCE(sqe->off); | |
3873 | req->fadvise.len = READ_ONCE(sqe->len); | |
3874 | req->fadvise.advice = READ_ONCE(sqe->fadvise_advice); | |
3875 | return 0; | |
3876 | } | |
3877 | ||
014db007 | 3878 | static int io_fadvise(struct io_kiocb *req, bool force_nonblock) |
4840e418 JA |
3879 | { |
3880 | struct io_fadvise *fa = &req->fadvise; | |
3881 | int ret; | |
3882 | ||
3e69426d JA |
3883 | if (force_nonblock) { |
3884 | switch (fa->advice) { | |
3885 | case POSIX_FADV_NORMAL: | |
3886 | case POSIX_FADV_RANDOM: | |
3887 | case POSIX_FADV_SEQUENTIAL: | |
3888 | break; | |
3889 | default: | |
3890 | return -EAGAIN; | |
3891 | } | |
3892 | } | |
4840e418 JA |
3893 | |
3894 | ret = vfs_fadvise(req->file, fa->offset, fa->len, fa->advice); | |
3895 | if (ret < 0) | |
3896 | req_set_fail_links(req); | |
e1e16097 | 3897 | io_req_complete(req, ret); |
4840e418 JA |
3898 | return 0; |
3899 | } | |
3900 | ||
eddc7ef5 JA |
3901 | static int io_statx_prep(struct io_kiocb *req, const struct io_uring_sqe *sqe) |
3902 | { | |
3232dd02 PB |
3903 | if (unlikely(req->ctx->flags & IORING_SETUP_IOPOLL)) |
3904 | return -EINVAL; | |
eddc7ef5 JA |
3905 | if (sqe->ioprio || sqe->buf_index) |
3906 | return -EINVAL; | |
9c280f90 | 3907 | if (req->flags & REQ_F_FIXED_FILE) |
cf3040ca | 3908 | return -EBADF; |
eddc7ef5 | 3909 | |
1d9e1288 BM |
3910 | req->statx.dfd = READ_ONCE(sqe->fd); |
3911 | req->statx.mask = READ_ONCE(sqe->len); | |
e62753e4 | 3912 | req->statx.filename = u64_to_user_ptr(READ_ONCE(sqe->addr)); |
1d9e1288 BM |
3913 | req->statx.buffer = u64_to_user_ptr(READ_ONCE(sqe->addr2)); |
3914 | req->statx.flags = READ_ONCE(sqe->statx_flags); | |
eddc7ef5 JA |
3915 | |
3916 | return 0; | |
3917 | } | |
3918 | ||
014db007 | 3919 | static int io_statx(struct io_kiocb *req, bool force_nonblock) |
eddc7ef5 | 3920 | { |
1d9e1288 | 3921 | struct io_statx *ctx = &req->statx; |
eddc7ef5 JA |
3922 | int ret; |
3923 | ||
5b0bbee4 JA |
3924 | if (force_nonblock) { |
3925 | /* only need file table for an actual valid fd */ | |
3926 | if (ctx->dfd == -1 || ctx->dfd == AT_FDCWD) | |
3927 | req->flags |= REQ_F_NO_FILE_TABLE; | |
eddc7ef5 | 3928 | return -EAGAIN; |
5b0bbee4 | 3929 | } |
eddc7ef5 | 3930 | |
e62753e4 BM |
3931 | ret = do_statx(ctx->dfd, ctx->filename, ctx->flags, ctx->mask, |
3932 | ctx->buffer); | |
eddc7ef5 | 3933 | |
eddc7ef5 JA |
3934 | if (ret < 0) |
3935 | req_set_fail_links(req); | |
e1e16097 | 3936 | io_req_complete(req, ret); |
eddc7ef5 JA |
3937 | return 0; |
3938 | } | |
3939 | ||
b5dba59e JA |
3940 | static int io_close_prep(struct io_kiocb *req, const struct io_uring_sqe *sqe) |
3941 | { | |
3942 | /* | |
3943 | * If we queue this for async, it must not be cancellable. That would | |
7cdaf587 XW |
3944 | * leave the 'file' in an undeterminate state, and here need to modify |
3945 | * io_wq_work.flags, so initialize io_wq_work firstly. | |
b5dba59e | 3946 | */ |
7cdaf587 | 3947 | io_req_init_async(req); |
b5dba59e JA |
3948 | req->work.flags |= IO_WQ_WORK_NO_CANCEL; |
3949 | ||
3232dd02 PB |
3950 | if (unlikely(req->ctx->flags & (IORING_SETUP_IOPOLL|IORING_SETUP_SQPOLL))) |
3951 | return -EINVAL; | |
b5dba59e JA |
3952 | if (sqe->ioprio || sqe->off || sqe->addr || sqe->len || |
3953 | sqe->rw_flags || sqe->buf_index) | |
3954 | return -EINVAL; | |
9c280f90 | 3955 | if (req->flags & REQ_F_FIXED_FILE) |
cf3040ca | 3956 | return -EBADF; |
b5dba59e JA |
3957 | |
3958 | req->close.fd = READ_ONCE(sqe->fd); | |
fd2206e4 JA |
3959 | if ((req->file && req->file->f_op == &io_uring_fops) || |
3960 | req->close.fd == req->ctx->ring_fd) | |
3961 | return -EBADF; | |
b5dba59e | 3962 | |
3af73b28 | 3963 | req->close.put_file = NULL; |
b5dba59e | 3964 | return 0; |
b5dba59e JA |
3965 | } |
3966 | ||
229a7b63 JA |
3967 | static int io_close(struct io_kiocb *req, bool force_nonblock, |
3968 | struct io_comp_state *cs) | |
b5dba59e | 3969 | { |
3af73b28 | 3970 | struct io_close *close = &req->close; |
b5dba59e JA |
3971 | int ret; |
3972 | ||
3af73b28 PB |
3973 | /* might be already done during nonblock submission */ |
3974 | if (!close->put_file) { | |
3975 | ret = __close_fd_get_file(close->fd, &close->put_file); | |
3976 | if (ret < 0) | |
3977 | return (ret == -ENOENT) ? -EBADF : ret; | |
3978 | } | |
b5dba59e JA |
3979 | |
3980 | /* if the file has a flush method, be safe and punt to async */ | |
3af73b28 | 3981 | if (close->put_file->f_op->flush && force_nonblock) { |
24c74678 PB |
3982 | /* was never set, but play safe */ |
3983 | req->flags &= ~REQ_F_NOWAIT; | |
0bf0eefd | 3984 | /* avoid grabbing files - we don't need the files */ |
24c74678 | 3985 | req->flags |= REQ_F_NO_FILE_TABLE; |
0bf0eefd | 3986 | return -EAGAIN; |
a2100672 | 3987 | } |
b5dba59e | 3988 | |
3af73b28 PB |
3989 | /* No ->flush() or already async, safely close from here */ |
3990 | ret = filp_close(close->put_file, req->work.files); | |
3991 | if (ret < 0) | |
3992 | req_set_fail_links(req); | |
3af73b28 PB |
3993 | fput(close->put_file); |
3994 | close->put_file = NULL; | |
229a7b63 | 3995 | __io_req_complete(req, ret, 0, cs); |
1a417f4e | 3996 | return 0; |
b5dba59e JA |
3997 | } |
3998 | ||
3529d8c2 | 3999 | static int io_prep_sfr(struct io_kiocb *req, const struct io_uring_sqe *sqe) |
5d17b4a4 JA |
4000 | { |
4001 | struct io_ring_ctx *ctx = req->ctx; | |
5d17b4a4 JA |
4002 | |
4003 | if (!req->file) | |
4004 | return -EBADF; | |
5d17b4a4 JA |
4005 | |
4006 | if (unlikely(ctx->flags & IORING_SETUP_IOPOLL)) | |
4007 | return -EINVAL; | |
4008 | if (unlikely(sqe->addr || sqe->ioprio || sqe->buf_index)) | |
4009 | return -EINVAL; | |
4010 | ||
8ed8d3c3 JA |
4011 | req->sync.off = READ_ONCE(sqe->off); |
4012 | req->sync.len = READ_ONCE(sqe->len); | |
4013 | req->sync.flags = READ_ONCE(sqe->sync_range_flags); | |
8ed8d3c3 JA |
4014 | return 0; |
4015 | } | |
4016 | ||
ac45abc0 | 4017 | static int io_sync_file_range(struct io_kiocb *req, bool force_nonblock) |
8ed8d3c3 | 4018 | { |
8ed8d3c3 JA |
4019 | int ret; |
4020 | ||
ac45abc0 PB |
4021 | /* sync_file_range always requires a blocking context */ |
4022 | if (force_nonblock) | |
4023 | return -EAGAIN; | |
4024 | ||
9adbd45d | 4025 | ret = sync_file_range(req->file, req->sync.off, req->sync.len, |
8ed8d3c3 JA |
4026 | req->sync.flags); |
4027 | if (ret < 0) | |
4028 | req_set_fail_links(req); | |
e1e16097 | 4029 | io_req_complete(req, ret); |
5d17b4a4 JA |
4030 | return 0; |
4031 | } | |
4032 | ||
469956e8 | 4033 | #if defined(CONFIG_NET) |
02d27d89 PB |
4034 | static int io_setup_async_msg(struct io_kiocb *req, |
4035 | struct io_async_msghdr *kmsg) | |
4036 | { | |
4037 | if (req->io) | |
4038 | return -EAGAIN; | |
4039 | if (io_alloc_async_ctx(req)) { | |
4040 | if (kmsg->iov != kmsg->fast_iov) | |
4041 | kfree(kmsg->iov); | |
4042 | return -ENOMEM; | |
4043 | } | |
4044 | req->flags |= REQ_F_NEED_CLEANUP; | |
4045 | memcpy(&req->io->msg, kmsg, sizeof(*kmsg)); | |
4046 | return -EAGAIN; | |
4047 | } | |
4048 | ||
2ae523ed PB |
4049 | static int io_sendmsg_copy_hdr(struct io_kiocb *req, |
4050 | struct io_async_msghdr *iomsg) | |
4051 | { | |
4052 | iomsg->iov = iomsg->fast_iov; | |
4053 | iomsg->msg.msg_name = &iomsg->addr; | |
4054 | return sendmsg_copy_msghdr(&iomsg->msg, req->sr_msg.umsg, | |
4055 | req->sr_msg.msg_flags, &iomsg->iov); | |
4056 | } | |
4057 | ||
3529d8c2 | 4058 | static int io_sendmsg_prep(struct io_kiocb *req, const struct io_uring_sqe *sqe) |
03b1230c | 4059 | { |
e47293fd | 4060 | struct io_sr_msg *sr = &req->sr_msg; |
3529d8c2 | 4061 | struct io_async_ctx *io = req->io; |
99bc4c38 | 4062 | int ret; |
03b1230c | 4063 | |
d2b6f48b PB |
4064 | if (unlikely(req->ctx->flags & IORING_SETUP_IOPOLL)) |
4065 | return -EINVAL; | |
4066 | ||
e47293fd | 4067 | sr->msg_flags = READ_ONCE(sqe->msg_flags); |
270a5940 | 4068 | sr->umsg = u64_to_user_ptr(READ_ONCE(sqe->addr)); |
fddaface | 4069 | sr->len = READ_ONCE(sqe->len); |
3529d8c2 | 4070 | |
d8768362 JA |
4071 | #ifdef CONFIG_COMPAT |
4072 | if (req->ctx->compat) | |
4073 | sr->msg_flags |= MSG_CMSG_COMPAT; | |
4074 | #endif | |
4075 | ||
fddaface | 4076 | if (!io || req->opcode == IORING_OP_SEND) |
3529d8c2 | 4077 | return 0; |
5f798bea PB |
4078 | /* iovec is already imported */ |
4079 | if (req->flags & REQ_F_NEED_CLEANUP) | |
4080 | return 0; | |
3529d8c2 | 4081 | |
2ae523ed | 4082 | ret = io_sendmsg_copy_hdr(req, &io->msg); |
99bc4c38 PB |
4083 | if (!ret) |
4084 | req->flags |= REQ_F_NEED_CLEANUP; | |
4085 | return ret; | |
03b1230c JA |
4086 | } |
4087 | ||
229a7b63 JA |
4088 | static int io_sendmsg(struct io_kiocb *req, bool force_nonblock, |
4089 | struct io_comp_state *cs) | |
aa1fa28f | 4090 | { |
6b754c8b | 4091 | struct io_async_msghdr iomsg, *kmsg; |
0fa03c62 | 4092 | struct socket *sock; |
7a7cacba | 4093 | unsigned flags; |
0fa03c62 JA |
4094 | int ret; |
4095 | ||
0fa03c62 | 4096 | sock = sock_from_file(req->file, &ret); |
7a7cacba PB |
4097 | if (unlikely(!sock)) |
4098 | return ret; | |
3529d8c2 | 4099 | |
7a7cacba PB |
4100 | if (req->io) { |
4101 | kmsg = &req->io->msg; | |
4102 | kmsg->msg.msg_name = &req->io->msg.addr; | |
4103 | /* if iov is set, it's allocated already */ | |
4104 | if (!kmsg->iov) | |
4105 | kmsg->iov = kmsg->fast_iov; | |
4106 | kmsg->msg.msg_iter.iov = kmsg->iov; | |
4107 | } else { | |
4108 | ret = io_sendmsg_copy_hdr(req, &iomsg); | |
4109 | if (ret) | |
4110 | return ret; | |
4111 | kmsg = &iomsg; | |
0fa03c62 | 4112 | } |
0fa03c62 | 4113 | |
7a7cacba PB |
4114 | flags = req->sr_msg.msg_flags; |
4115 | if (flags & MSG_DONTWAIT) | |
4116 | req->flags |= REQ_F_NOWAIT; | |
4117 | else if (force_nonblock) | |
4118 | flags |= MSG_DONTWAIT; | |
e47293fd | 4119 | |
7a7cacba PB |
4120 | ret = __sys_sendmsg_sock(sock, &kmsg->msg, flags); |
4121 | if (force_nonblock && ret == -EAGAIN) | |
4122 | return io_setup_async_msg(req, kmsg); | |
4123 | if (ret == -ERESTARTSYS) | |
4124 | ret = -EINTR; | |
0fa03c62 | 4125 | |
6b754c8b | 4126 | if (kmsg->iov != kmsg->fast_iov) |
0b416c3e | 4127 | kfree(kmsg->iov); |
99bc4c38 | 4128 | req->flags &= ~REQ_F_NEED_CLEANUP; |
4e88d6e7 JA |
4129 | if (ret < 0) |
4130 | req_set_fail_links(req); | |
229a7b63 | 4131 | __io_req_complete(req, ret, 0, cs); |
5d17b4a4 | 4132 | return 0; |
03b1230c | 4133 | } |
aa1fa28f | 4134 | |
229a7b63 JA |
4135 | static int io_send(struct io_kiocb *req, bool force_nonblock, |
4136 | struct io_comp_state *cs) | |
fddaface | 4137 | { |
7a7cacba PB |
4138 | struct io_sr_msg *sr = &req->sr_msg; |
4139 | struct msghdr msg; | |
4140 | struct iovec iov; | |
fddaface | 4141 | struct socket *sock; |
7a7cacba | 4142 | unsigned flags; |
fddaface JA |
4143 | int ret; |
4144 | ||
fddaface | 4145 | sock = sock_from_file(req->file, &ret); |
7a7cacba PB |
4146 | if (unlikely(!sock)) |
4147 | return ret; | |
fddaface | 4148 | |
7a7cacba PB |
4149 | ret = import_single_range(WRITE, sr->buf, sr->len, &iov, &msg.msg_iter); |
4150 | if (unlikely(ret)) | |
14c32eee | 4151 | return ret;; |
fddaface | 4152 | |
7a7cacba PB |
4153 | msg.msg_name = NULL; |
4154 | msg.msg_control = NULL; | |
4155 | msg.msg_controllen = 0; | |
4156 | msg.msg_namelen = 0; | |
fddaface | 4157 | |
7a7cacba PB |
4158 | flags = req->sr_msg.msg_flags; |
4159 | if (flags & MSG_DONTWAIT) | |
4160 | req->flags |= REQ_F_NOWAIT; | |
4161 | else if (force_nonblock) | |
4162 | flags |= MSG_DONTWAIT; | |
fddaface | 4163 | |
7a7cacba PB |
4164 | msg.msg_flags = flags; |
4165 | ret = sock_sendmsg(sock, &msg); | |
4166 | if (force_nonblock && ret == -EAGAIN) | |
4167 | return -EAGAIN; | |
4168 | if (ret == -ERESTARTSYS) | |
4169 | ret = -EINTR; | |
fddaface | 4170 | |
fddaface JA |
4171 | if (ret < 0) |
4172 | req_set_fail_links(req); | |
229a7b63 | 4173 | __io_req_complete(req, ret, 0, cs); |
fddaface | 4174 | return 0; |
fddaface JA |
4175 | } |
4176 | ||
1400e697 PB |
4177 | static int __io_recvmsg_copy_hdr(struct io_kiocb *req, |
4178 | struct io_async_msghdr *iomsg) | |
52de1fe1 JA |
4179 | { |
4180 | struct io_sr_msg *sr = &req->sr_msg; | |
4181 | struct iovec __user *uiov; | |
4182 | size_t iov_len; | |
4183 | int ret; | |
4184 | ||
1400e697 PB |
4185 | ret = __copy_msghdr_from_user(&iomsg->msg, sr->umsg, |
4186 | &iomsg->uaddr, &uiov, &iov_len); | |
52de1fe1 JA |
4187 | if (ret) |
4188 | return ret; | |
4189 | ||
4190 | if (req->flags & REQ_F_BUFFER_SELECT) { | |
4191 | if (iov_len > 1) | |
4192 | return -EINVAL; | |
1400e697 | 4193 | if (copy_from_user(iomsg->iov, uiov, sizeof(*uiov))) |
52de1fe1 | 4194 | return -EFAULT; |
1400e697 PB |
4195 | sr->len = iomsg->iov[0].iov_len; |
4196 | iov_iter_init(&iomsg->msg.msg_iter, READ, iomsg->iov, 1, | |
52de1fe1 | 4197 | sr->len); |
1400e697 | 4198 | iomsg->iov = NULL; |
52de1fe1 JA |
4199 | } else { |
4200 | ret = import_iovec(READ, uiov, iov_len, UIO_FASTIOV, | |
1400e697 | 4201 | &iomsg->iov, &iomsg->msg.msg_iter); |
52de1fe1 JA |
4202 | if (ret > 0) |
4203 | ret = 0; | |
4204 | } | |
4205 | ||
4206 | return ret; | |
4207 | } | |
4208 | ||
4209 | #ifdef CONFIG_COMPAT | |
4210 | static int __io_compat_recvmsg_copy_hdr(struct io_kiocb *req, | |
1400e697 | 4211 | struct io_async_msghdr *iomsg) |
52de1fe1 JA |
4212 | { |
4213 | struct compat_msghdr __user *msg_compat; | |
4214 | struct io_sr_msg *sr = &req->sr_msg; | |
4215 | struct compat_iovec __user *uiov; | |
4216 | compat_uptr_t ptr; | |
4217 | compat_size_t len; | |
4218 | int ret; | |
4219 | ||
270a5940 | 4220 | msg_compat = (struct compat_msghdr __user *) sr->umsg; |
1400e697 | 4221 | ret = __get_compat_msghdr(&iomsg->msg, msg_compat, &iomsg->uaddr, |
52de1fe1 JA |
4222 | &ptr, &len); |
4223 | if (ret) | |
4224 | return ret; | |
4225 | ||
4226 | uiov = compat_ptr(ptr); | |
4227 | if (req->flags & REQ_F_BUFFER_SELECT) { | |
4228 | compat_ssize_t clen; | |
4229 | ||
4230 | if (len > 1) | |
4231 | return -EINVAL; | |
4232 | if (!access_ok(uiov, sizeof(*uiov))) | |
4233 | return -EFAULT; | |
4234 | if (__get_user(clen, &uiov->iov_len)) | |
4235 | return -EFAULT; | |
4236 | if (clen < 0) | |
4237 | return -EINVAL; | |
1400e697 PB |
4238 | sr->len = iomsg->iov[0].iov_len; |
4239 | iomsg->iov = NULL; | |
52de1fe1 JA |
4240 | } else { |
4241 | ret = compat_import_iovec(READ, uiov, len, UIO_FASTIOV, | |
1400e697 PB |
4242 | &iomsg->iov, |
4243 | &iomsg->msg.msg_iter); | |
52de1fe1 JA |
4244 | if (ret < 0) |
4245 | return ret; | |
4246 | } | |
4247 | ||
4248 | return 0; | |
4249 | } | |
4250 | #endif | |
4251 | ||
1400e697 PB |
4252 | static int io_recvmsg_copy_hdr(struct io_kiocb *req, |
4253 | struct io_async_msghdr *iomsg) | |
52de1fe1 | 4254 | { |
1400e697 PB |
4255 | iomsg->msg.msg_name = &iomsg->addr; |
4256 | iomsg->iov = iomsg->fast_iov; | |
52de1fe1 JA |
4257 | |
4258 | #ifdef CONFIG_COMPAT | |
4259 | if (req->ctx->compat) | |
1400e697 | 4260 | return __io_compat_recvmsg_copy_hdr(req, iomsg); |
fddaface | 4261 | #endif |
52de1fe1 | 4262 | |
1400e697 | 4263 | return __io_recvmsg_copy_hdr(req, iomsg); |
52de1fe1 JA |
4264 | } |
4265 | ||
bcda7baa | 4266 | static struct io_buffer *io_recv_buffer_select(struct io_kiocb *req, |
7fbb1b54 | 4267 | bool needs_lock) |
bcda7baa JA |
4268 | { |
4269 | struct io_sr_msg *sr = &req->sr_msg; | |
4270 | struct io_buffer *kbuf; | |
4271 | ||
bcda7baa JA |
4272 | kbuf = io_buffer_select(req, &sr->len, sr->bgid, sr->kbuf, needs_lock); |
4273 | if (IS_ERR(kbuf)) | |
4274 | return kbuf; | |
4275 | ||
4276 | sr->kbuf = kbuf; | |
4277 | req->flags |= REQ_F_BUFFER_SELECTED; | |
bcda7baa | 4278 | return kbuf; |
fddaface JA |
4279 | } |
4280 | ||
7fbb1b54 PB |
4281 | static inline unsigned int io_put_recv_kbuf(struct io_kiocb *req) |
4282 | { | |
4283 | return io_put_kbuf(req, req->sr_msg.kbuf); | |
4284 | } | |
4285 | ||
3529d8c2 JA |
4286 | static int io_recvmsg_prep(struct io_kiocb *req, |
4287 | const struct io_uring_sqe *sqe) | |
aa1fa28f | 4288 | { |
e47293fd | 4289 | struct io_sr_msg *sr = &req->sr_msg; |
3529d8c2 | 4290 | struct io_async_ctx *io = req->io; |
99bc4c38 | 4291 | int ret; |
3529d8c2 | 4292 | |
d2b6f48b PB |
4293 | if (unlikely(req->ctx->flags & IORING_SETUP_IOPOLL)) |
4294 | return -EINVAL; | |
4295 | ||
3529d8c2 | 4296 | sr->msg_flags = READ_ONCE(sqe->msg_flags); |
270a5940 | 4297 | sr->umsg = u64_to_user_ptr(READ_ONCE(sqe->addr)); |
0b7b21e4 | 4298 | sr->len = READ_ONCE(sqe->len); |
bcda7baa | 4299 | sr->bgid = READ_ONCE(sqe->buf_group); |
06b76d44 | 4300 | |
d8768362 JA |
4301 | #ifdef CONFIG_COMPAT |
4302 | if (req->ctx->compat) | |
4303 | sr->msg_flags |= MSG_CMSG_COMPAT; | |
4304 | #endif | |
4305 | ||
fddaface | 4306 | if (!io || req->opcode == IORING_OP_RECV) |
06b76d44 | 4307 | return 0; |
5f798bea PB |
4308 | /* iovec is already imported */ |
4309 | if (req->flags & REQ_F_NEED_CLEANUP) | |
4310 | return 0; | |
03b1230c | 4311 | |
1400e697 | 4312 | ret = io_recvmsg_copy_hdr(req, &io->msg); |
99bc4c38 PB |
4313 | if (!ret) |
4314 | req->flags |= REQ_F_NEED_CLEANUP; | |
4315 | return ret; | |
aa1fa28f JA |
4316 | } |
4317 | ||
229a7b63 JA |
4318 | static int io_recvmsg(struct io_kiocb *req, bool force_nonblock, |
4319 | struct io_comp_state *cs) | |
aa1fa28f | 4320 | { |
6b754c8b | 4321 | struct io_async_msghdr iomsg, *kmsg; |
03b1230c | 4322 | struct socket *sock; |
7fbb1b54 | 4323 | struct io_buffer *kbuf; |
7a7cacba | 4324 | unsigned flags; |
52de1fe1 | 4325 | int ret, cflags = 0; |
03b1230c | 4326 | |
03b1230c | 4327 | sock = sock_from_file(req->file, &ret); |
7a7cacba PB |
4328 | if (unlikely(!sock)) |
4329 | return ret; | |
3529d8c2 | 4330 | |
7a7cacba PB |
4331 | if (req->io) { |
4332 | kmsg = &req->io->msg; | |
4333 | kmsg->msg.msg_name = &req->io->msg.addr; | |
4334 | /* if iov is set, it's allocated already */ | |
4335 | if (!kmsg->iov) | |
4336 | kmsg->iov = kmsg->fast_iov; | |
4337 | kmsg->msg.msg_iter.iov = kmsg->iov; | |
4338 | } else { | |
4339 | ret = io_recvmsg_copy_hdr(req, &iomsg); | |
4340 | if (ret) | |
681fda8d | 4341 | return ret; |
7a7cacba PB |
4342 | kmsg = &iomsg; |
4343 | } | |
03b1230c | 4344 | |
bc02ef33 | 4345 | if (req->flags & REQ_F_BUFFER_SELECT) { |
7fbb1b54 | 4346 | kbuf = io_recv_buffer_select(req, !force_nonblock); |
bc02ef33 | 4347 | if (IS_ERR(kbuf)) |
52de1fe1 | 4348 | return PTR_ERR(kbuf); |
7a7cacba PB |
4349 | kmsg->fast_iov[0].iov_base = u64_to_user_ptr(kbuf->addr); |
4350 | iov_iter_init(&kmsg->msg.msg_iter, READ, kmsg->iov, | |
4351 | 1, req->sr_msg.len); | |
4352 | } | |
52de1fe1 | 4353 | |
7a7cacba PB |
4354 | flags = req->sr_msg.msg_flags; |
4355 | if (flags & MSG_DONTWAIT) | |
4356 | req->flags |= REQ_F_NOWAIT; | |
4357 | else if (force_nonblock) | |
4358 | flags |= MSG_DONTWAIT; | |
e47293fd | 4359 | |
7a7cacba PB |
4360 | ret = __sys_recvmsg_sock(sock, &kmsg->msg, req->sr_msg.umsg, |
4361 | kmsg->uaddr, flags); | |
0e1b6fe3 PB |
4362 | if (force_nonblock && ret == -EAGAIN) |
4363 | return io_setup_async_msg(req, kmsg); | |
7a7cacba PB |
4364 | if (ret == -ERESTARTSYS) |
4365 | ret = -EINTR; | |
03b1230c | 4366 | |
7fbb1b54 PB |
4367 | if (req->flags & REQ_F_BUFFER_SELECTED) |
4368 | cflags = io_put_recv_kbuf(req); | |
6b754c8b | 4369 | if (kmsg->iov != kmsg->fast_iov) |
0b416c3e | 4370 | kfree(kmsg->iov); |
99bc4c38 | 4371 | req->flags &= ~REQ_F_NEED_CLEANUP; |
4e88d6e7 JA |
4372 | if (ret < 0) |
4373 | req_set_fail_links(req); | |
229a7b63 | 4374 | __io_req_complete(req, ret, cflags, cs); |
03b1230c | 4375 | return 0; |
0fa03c62 | 4376 | } |
5d17b4a4 | 4377 | |
229a7b63 JA |
4378 | static int io_recv(struct io_kiocb *req, bool force_nonblock, |
4379 | struct io_comp_state *cs) | |
fddaface | 4380 | { |
6b754c8b | 4381 | struct io_buffer *kbuf; |
7a7cacba PB |
4382 | struct io_sr_msg *sr = &req->sr_msg; |
4383 | struct msghdr msg; | |
4384 | void __user *buf = sr->buf; | |
fddaface | 4385 | struct socket *sock; |
7a7cacba PB |
4386 | struct iovec iov; |
4387 | unsigned flags; | |
bcda7baa | 4388 | int ret, cflags = 0; |
fddaface | 4389 | |
fddaface | 4390 | sock = sock_from_file(req->file, &ret); |
7a7cacba PB |
4391 | if (unlikely(!sock)) |
4392 | return ret; | |
fddaface | 4393 | |
bc02ef33 | 4394 | if (req->flags & REQ_F_BUFFER_SELECT) { |
7fbb1b54 | 4395 | kbuf = io_recv_buffer_select(req, !force_nonblock); |
bcda7baa JA |
4396 | if (IS_ERR(kbuf)) |
4397 | return PTR_ERR(kbuf); | |
7a7cacba | 4398 | buf = u64_to_user_ptr(kbuf->addr); |
bc02ef33 | 4399 | } |
bcda7baa | 4400 | |
7a7cacba | 4401 | ret = import_single_range(READ, buf, sr->len, &iov, &msg.msg_iter); |
14c32eee PB |
4402 | if (unlikely(ret)) |
4403 | goto out_free; | |
fddaface | 4404 | |
7a7cacba PB |
4405 | msg.msg_name = NULL; |
4406 | msg.msg_control = NULL; | |
4407 | msg.msg_controllen = 0; | |
4408 | msg.msg_namelen = 0; | |
4409 | msg.msg_iocb = NULL; | |
4410 | msg.msg_flags = 0; | |
fddaface | 4411 | |
7a7cacba PB |
4412 | flags = req->sr_msg.msg_flags; |
4413 | if (flags & MSG_DONTWAIT) | |
4414 | req->flags |= REQ_F_NOWAIT; | |
4415 | else if (force_nonblock) | |
4416 | flags |= MSG_DONTWAIT; | |
4417 | ||
4418 | ret = sock_recvmsg(sock, &msg, flags); | |
4419 | if (force_nonblock && ret == -EAGAIN) | |
4420 | return -EAGAIN; | |
4421 | if (ret == -ERESTARTSYS) | |
4422 | ret = -EINTR; | |
14c32eee | 4423 | out_free: |
7fbb1b54 PB |
4424 | if (req->flags & REQ_F_BUFFER_SELECTED) |
4425 | cflags = io_put_recv_kbuf(req); | |
fddaface JA |
4426 | if (ret < 0) |
4427 | req_set_fail_links(req); | |
229a7b63 | 4428 | __io_req_complete(req, ret, cflags, cs); |
fddaface | 4429 | return 0; |
fddaface JA |
4430 | } |
4431 | ||
3529d8c2 | 4432 | static int io_accept_prep(struct io_kiocb *req, const struct io_uring_sqe *sqe) |
17f2fe35 | 4433 | { |
8ed8d3c3 JA |
4434 | struct io_accept *accept = &req->accept; |
4435 | ||
17f2fe35 JA |
4436 | if (unlikely(req->ctx->flags & (IORING_SETUP_IOPOLL|IORING_SETUP_SQPOLL))) |
4437 | return -EINVAL; | |
8042d6ce | 4438 | if (sqe->ioprio || sqe->len || sqe->buf_index) |
17f2fe35 JA |
4439 | return -EINVAL; |
4440 | ||
d55e5f5b JA |
4441 | accept->addr = u64_to_user_ptr(READ_ONCE(sqe->addr)); |
4442 | accept->addr_len = u64_to_user_ptr(READ_ONCE(sqe->addr2)); | |
8ed8d3c3 | 4443 | accept->flags = READ_ONCE(sqe->accept_flags); |
09952e3e | 4444 | accept->nofile = rlimit(RLIMIT_NOFILE); |
8ed8d3c3 | 4445 | return 0; |
8ed8d3c3 | 4446 | } |
17f2fe35 | 4447 | |
229a7b63 JA |
4448 | static int io_accept(struct io_kiocb *req, bool force_nonblock, |
4449 | struct io_comp_state *cs) | |
8ed8d3c3 JA |
4450 | { |
4451 | struct io_accept *accept = &req->accept; | |
ac45abc0 | 4452 | unsigned int file_flags = force_nonblock ? O_NONBLOCK : 0; |
8ed8d3c3 JA |
4453 | int ret; |
4454 | ||
e697deed JX |
4455 | if (req->file->f_flags & O_NONBLOCK) |
4456 | req->flags |= REQ_F_NOWAIT; | |
4457 | ||
8ed8d3c3 | 4458 | ret = __sys_accept4_file(req->file, file_flags, accept->addr, |
09952e3e JA |
4459 | accept->addr_len, accept->flags, |
4460 | accept->nofile); | |
8ed8d3c3 | 4461 | if (ret == -EAGAIN && force_nonblock) |
17f2fe35 | 4462 | return -EAGAIN; |
ac45abc0 PB |
4463 | if (ret < 0) { |
4464 | if (ret == -ERESTARTSYS) | |
4465 | ret = -EINTR; | |
4e88d6e7 | 4466 | req_set_fail_links(req); |
ac45abc0 | 4467 | } |
229a7b63 | 4468 | __io_req_complete(req, ret, 0, cs); |
17f2fe35 | 4469 | return 0; |
8ed8d3c3 JA |
4470 | } |
4471 | ||
3529d8c2 | 4472 | static int io_connect_prep(struct io_kiocb *req, const struct io_uring_sqe *sqe) |
f499a021 | 4473 | { |
3529d8c2 JA |
4474 | struct io_connect *conn = &req->connect; |
4475 | struct io_async_ctx *io = req->io; | |
f499a021 | 4476 | |
3fbb51c1 JA |
4477 | if (unlikely(req->ctx->flags & (IORING_SETUP_IOPOLL|IORING_SETUP_SQPOLL))) |
4478 | return -EINVAL; | |
4479 | if (sqe->ioprio || sqe->len || sqe->buf_index || sqe->rw_flags) | |
4480 | return -EINVAL; | |
4481 | ||
3529d8c2 JA |
4482 | conn->addr = u64_to_user_ptr(READ_ONCE(sqe->addr)); |
4483 | conn->addr_len = READ_ONCE(sqe->addr2); | |
4484 | ||
4485 | if (!io) | |
4486 | return 0; | |
4487 | ||
4488 | return move_addr_to_kernel(conn->addr, conn->addr_len, | |
3fbb51c1 | 4489 | &io->connect.address); |
f499a021 JA |
4490 | } |
4491 | ||
229a7b63 JA |
4492 | static int io_connect(struct io_kiocb *req, bool force_nonblock, |
4493 | struct io_comp_state *cs) | |
f8e85cf2 | 4494 | { |
f499a021 | 4495 | struct io_async_ctx __io, *io; |
f8e85cf2 | 4496 | unsigned file_flags; |
3fbb51c1 | 4497 | int ret; |
f8e85cf2 | 4498 | |
f499a021 JA |
4499 | if (req->io) { |
4500 | io = req->io; | |
4501 | } else { | |
3529d8c2 JA |
4502 | ret = move_addr_to_kernel(req->connect.addr, |
4503 | req->connect.addr_len, | |
4504 | &__io.connect.address); | |
f499a021 JA |
4505 | if (ret) |
4506 | goto out; | |
4507 | io = &__io; | |
4508 | } | |
4509 | ||
3fbb51c1 JA |
4510 | file_flags = force_nonblock ? O_NONBLOCK : 0; |
4511 | ||
4512 | ret = __sys_connect_file(req->file, &io->connect.address, | |
4513 | req->connect.addr_len, file_flags); | |
87f80d62 | 4514 | if ((ret == -EAGAIN || ret == -EINPROGRESS) && force_nonblock) { |
b7bb4f7d JA |
4515 | if (req->io) |
4516 | return -EAGAIN; | |
4517 | if (io_alloc_async_ctx(req)) { | |
f499a021 JA |
4518 | ret = -ENOMEM; |
4519 | goto out; | |
4520 | } | |
b7bb4f7d | 4521 | memcpy(&req->io->connect, &__io.connect, sizeof(__io.connect)); |
f8e85cf2 | 4522 | return -EAGAIN; |
f499a021 | 4523 | } |
f8e85cf2 JA |
4524 | if (ret == -ERESTARTSYS) |
4525 | ret = -EINTR; | |
f499a021 | 4526 | out: |
4e88d6e7 JA |
4527 | if (ret < 0) |
4528 | req_set_fail_links(req); | |
229a7b63 | 4529 | __io_req_complete(req, ret, 0, cs); |
f8e85cf2 | 4530 | return 0; |
469956e8 Y |
4531 | } |
4532 | #else /* !CONFIG_NET */ | |
4533 | static int io_sendmsg_prep(struct io_kiocb *req, const struct io_uring_sqe *sqe) | |
4534 | { | |
f8e85cf2 | 4535 | return -EOPNOTSUPP; |
f8e85cf2 JA |
4536 | } |
4537 | ||
1e16c2f9 RD |
4538 | static int io_sendmsg(struct io_kiocb *req, bool force_nonblock, |
4539 | struct io_comp_state *cs) | |
469956e8 Y |
4540 | { |
4541 | return -EOPNOTSUPP; | |
4542 | } | |
4543 | ||
1e16c2f9 RD |
4544 | static int io_send(struct io_kiocb *req, bool force_nonblock, |
4545 | struct io_comp_state *cs) | |
469956e8 Y |
4546 | { |
4547 | return -EOPNOTSUPP; | |
4548 | } | |
4549 | ||
4550 | static int io_recvmsg_prep(struct io_kiocb *req, | |
4551 | const struct io_uring_sqe *sqe) | |
4552 | { | |
4553 | return -EOPNOTSUPP; | |
4554 | } | |
4555 | ||
1e16c2f9 RD |
4556 | static int io_recvmsg(struct io_kiocb *req, bool force_nonblock, |
4557 | struct io_comp_state *cs) | |
469956e8 Y |
4558 | { |
4559 | return -EOPNOTSUPP; | |
4560 | } | |
4561 | ||
1e16c2f9 RD |
4562 | static int io_recv(struct io_kiocb *req, bool force_nonblock, |
4563 | struct io_comp_state *cs) | |
469956e8 Y |
4564 | { |
4565 | return -EOPNOTSUPP; | |
4566 | } | |
4567 | ||
4568 | static int io_accept_prep(struct io_kiocb *req, const struct io_uring_sqe *sqe) | |
4569 | { | |
4570 | return -EOPNOTSUPP; | |
4571 | } | |
4572 | ||
1e16c2f9 RD |
4573 | static int io_accept(struct io_kiocb *req, bool force_nonblock, |
4574 | struct io_comp_state *cs) | |
469956e8 Y |
4575 | { |
4576 | return -EOPNOTSUPP; | |
4577 | } | |
ce593a6c | 4578 | |
469956e8 Y |
4579 | static int io_connect_prep(struct io_kiocb *req, const struct io_uring_sqe *sqe) |
4580 | { | |
4581 | return -EOPNOTSUPP; | |
4582 | } | |
4583 | ||
1e16c2f9 RD |
4584 | static int io_connect(struct io_kiocb *req, bool force_nonblock, |
4585 | struct io_comp_state *cs) | |
469956e8 | 4586 | { |
f8e85cf2 | 4587 | return -EOPNOTSUPP; |
ce593a6c | 4588 | } |
469956e8 | 4589 | #endif /* CONFIG_NET */ |
f8e85cf2 | 4590 | |
d7718a9d JA |
4591 | struct io_poll_table { |
4592 | struct poll_table_struct pt; | |
4593 | struct io_kiocb *req; | |
4594 | int error; | |
4595 | }; | |
ce593a6c | 4596 | |
d7718a9d JA |
4597 | static int __io_async_wake(struct io_kiocb *req, struct io_poll_iocb *poll, |
4598 | __poll_t mask, task_work_func_t func) | |
4599 | { | |
aa96bf8a | 4600 | int ret; |
d7718a9d JA |
4601 | |
4602 | /* for instances that support it check for an event match first: */ | |
4603 | if (mask && !(mask & poll->events)) | |
4604 | return 0; | |
4605 | ||
4606 | trace_io_uring_task_add(req->ctx, req->opcode, req->user_data, mask); | |
4607 | ||
4608 | list_del_init(&poll->wait.entry); | |
4609 | ||
d7718a9d JA |
4610 | req->result = mask; |
4611 | init_task_work(&req->task_work, func); | |
6d816e08 JA |
4612 | percpu_ref_get(&req->ctx->refs); |
4613 | ||
d7718a9d | 4614 | /* |
e3aabf95 JA |
4615 | * If this fails, then the task is exiting. When a task exits, the |
4616 | * work gets canceled, so just cancel this request as well instead | |
4617 | * of executing it. We can't safely execute it anyway, as we may not | |
4618 | * have the needed state needed for it anyway. | |
d7718a9d | 4619 | */ |
b7db41c9 | 4620 | ret = io_req_task_work_add(req, &req->task_work); |
aa96bf8a | 4621 | if (unlikely(ret)) { |
c2c4c83c JA |
4622 | struct task_struct *tsk; |
4623 | ||
e3aabf95 | 4624 | WRITE_ONCE(poll->canceled, true); |
aa96bf8a | 4625 | tsk = io_wq_get_task(req->ctx->io_wq); |
ce593a6c JA |
4626 | task_work_add(tsk, &req->task_work, 0); |
4627 | wake_up_process(tsk); | |
aa96bf8a | 4628 | } |
d7718a9d JA |
4629 | return 1; |
4630 | } | |
4631 | ||
74ce6ce4 JA |
4632 | static bool io_poll_rewait(struct io_kiocb *req, struct io_poll_iocb *poll) |
4633 | __acquires(&req->ctx->completion_lock) | |
4634 | { | |
4635 | struct io_ring_ctx *ctx = req->ctx; | |
4636 | ||
4637 | if (!req->result && !READ_ONCE(poll->canceled)) { | |
4638 | struct poll_table_struct pt = { ._key = poll->events }; | |
4639 | ||
4640 | req->result = vfs_poll(req->file, &pt) & poll->events; | |
4641 | } | |
4642 | ||
4643 | spin_lock_irq(&ctx->completion_lock); | |
4644 | if (!req->result && !READ_ONCE(poll->canceled)) { | |
4645 | add_wait_queue(poll->head, &poll->wait); | |
4646 | return true; | |
4647 | } | |
4648 | ||
4649 | return false; | |
4650 | } | |
4651 | ||
d4e7cd36 | 4652 | static struct io_poll_iocb *io_poll_get_double(struct io_kiocb *req) |
18bceab1 | 4653 | { |
d4e7cd36 JA |
4654 | /* pure poll stashes this in ->io, poll driven retry elsewhere */ |
4655 | if (req->opcode == IORING_OP_POLL_ADD) | |
4656 | return (struct io_poll_iocb *) req->io; | |
4657 | return req->apoll->double_poll; | |
4658 | } | |
4659 | ||
4660 | static struct io_poll_iocb *io_poll_get_single(struct io_kiocb *req) | |
4661 | { | |
4662 | if (req->opcode == IORING_OP_POLL_ADD) | |
4663 | return &req->poll; | |
4664 | return &req->apoll->poll; | |
4665 | } | |
4666 | ||
4667 | static void io_poll_remove_double(struct io_kiocb *req) | |
4668 | { | |
4669 | struct io_poll_iocb *poll = io_poll_get_double(req); | |
18bceab1 JA |
4670 | |
4671 | lockdep_assert_held(&req->ctx->completion_lock); | |
4672 | ||
4673 | if (poll && poll->head) { | |
4674 | struct wait_queue_head *head = poll->head; | |
4675 | ||
4676 | spin_lock(&head->lock); | |
4677 | list_del_init(&poll->wait.entry); | |
4678 | if (poll->wait.private) | |
4679 | refcount_dec(&req->refs); | |
4680 | poll->head = NULL; | |
4681 | spin_unlock(&head->lock); | |
4682 | } | |
4683 | } | |
4684 | ||
4685 | static void io_poll_complete(struct io_kiocb *req, __poll_t mask, int error) | |
4686 | { | |
4687 | struct io_ring_ctx *ctx = req->ctx; | |
4688 | ||
d4e7cd36 | 4689 | io_poll_remove_double(req); |
18bceab1 JA |
4690 | req->poll.done = true; |
4691 | io_cqring_fill_event(req, error ? error : mangle_poll(mask)); | |
4692 | io_commit_cqring(ctx); | |
4693 | } | |
4694 | ||
4695 | static void io_poll_task_handler(struct io_kiocb *req, struct io_kiocb **nxt) | |
4696 | { | |
4697 | struct io_ring_ctx *ctx = req->ctx; | |
4698 | ||
4699 | if (io_poll_rewait(req, &req->poll)) { | |
4700 | spin_unlock_irq(&ctx->completion_lock); | |
4701 | return; | |
4702 | } | |
4703 | ||
4704 | hash_del(&req->hash_node); | |
4705 | io_poll_complete(req, req->result, 0); | |
4706 | req->flags |= REQ_F_COMP_LOCKED; | |
9b5f7bd9 | 4707 | *nxt = io_put_req_find_next(req); |
18bceab1 JA |
4708 | spin_unlock_irq(&ctx->completion_lock); |
4709 | ||
4710 | io_cqring_ev_posted(ctx); | |
4711 | } | |
4712 | ||
4713 | static void io_poll_task_func(struct callback_head *cb) | |
4714 | { | |
4715 | struct io_kiocb *req = container_of(cb, struct io_kiocb, task_work); | |
6d816e08 | 4716 | struct io_ring_ctx *ctx = req->ctx; |
18bceab1 JA |
4717 | struct io_kiocb *nxt = NULL; |
4718 | ||
4719 | io_poll_task_handler(req, &nxt); | |
ea1164e5 PB |
4720 | if (nxt) |
4721 | __io_req_task_submit(nxt); | |
6d816e08 | 4722 | percpu_ref_put(&ctx->refs); |
18bceab1 JA |
4723 | } |
4724 | ||
4725 | static int io_poll_double_wake(struct wait_queue_entry *wait, unsigned mode, | |
4726 | int sync, void *key) | |
4727 | { | |
4728 | struct io_kiocb *req = wait->private; | |
d4e7cd36 | 4729 | struct io_poll_iocb *poll = io_poll_get_single(req); |
18bceab1 JA |
4730 | __poll_t mask = key_to_poll(key); |
4731 | ||
4732 | /* for instances that support it check for an event match first: */ | |
4733 | if (mask && !(mask & poll->events)) | |
4734 | return 0; | |
4735 | ||
807abcb0 | 4736 | if (poll && poll->head) { |
18bceab1 JA |
4737 | bool done; |
4738 | ||
807abcb0 JA |
4739 | spin_lock(&poll->head->lock); |
4740 | done = list_empty(&poll->wait.entry); | |
18bceab1 | 4741 | if (!done) |
807abcb0 | 4742 | list_del_init(&poll->wait.entry); |
d4e7cd36 JA |
4743 | /* make sure double remove sees this as being gone */ |
4744 | wait->private = NULL; | |
807abcb0 | 4745 | spin_unlock(&poll->head->lock); |
18bceab1 JA |
4746 | if (!done) |
4747 | __io_async_wake(req, poll, mask, io_poll_task_func); | |
4748 | } | |
4749 | refcount_dec(&req->refs); | |
4750 | return 1; | |
4751 | } | |
4752 | ||
4753 | static void io_init_poll_iocb(struct io_poll_iocb *poll, __poll_t events, | |
4754 | wait_queue_func_t wake_func) | |
4755 | { | |
4756 | poll->head = NULL; | |
4757 | poll->done = false; | |
4758 | poll->canceled = false; | |
4759 | poll->events = events; | |
4760 | INIT_LIST_HEAD(&poll->wait.entry); | |
4761 | init_waitqueue_func_entry(&poll->wait, wake_func); | |
4762 | } | |
4763 | ||
4764 | static void __io_queue_proc(struct io_poll_iocb *poll, struct io_poll_table *pt, | |
807abcb0 JA |
4765 | struct wait_queue_head *head, |
4766 | struct io_poll_iocb **poll_ptr) | |
18bceab1 JA |
4767 | { |
4768 | struct io_kiocb *req = pt->req; | |
4769 | ||
4770 | /* | |
4771 | * If poll->head is already set, it's because the file being polled | |
4772 | * uses multiple waitqueues for poll handling (eg one for read, one | |
4773 | * for write). Setup a separate io_poll_iocb if this happens. | |
4774 | */ | |
4775 | if (unlikely(poll->head)) { | |
4776 | /* already have a 2nd entry, fail a third attempt */ | |
807abcb0 | 4777 | if (*poll_ptr) { |
18bceab1 JA |
4778 | pt->error = -EINVAL; |
4779 | return; | |
4780 | } | |
4781 | poll = kmalloc(sizeof(*poll), GFP_ATOMIC); | |
4782 | if (!poll) { | |
4783 | pt->error = -ENOMEM; | |
4784 | return; | |
4785 | } | |
4786 | io_init_poll_iocb(poll, req->poll.events, io_poll_double_wake); | |
4787 | refcount_inc(&req->refs); | |
4788 | poll->wait.private = req; | |
807abcb0 | 4789 | *poll_ptr = poll; |
18bceab1 JA |
4790 | } |
4791 | ||
4792 | pt->error = 0; | |
4793 | poll->head = head; | |
a31eb4a2 JX |
4794 | |
4795 | if (poll->events & EPOLLEXCLUSIVE) | |
4796 | add_wait_queue_exclusive(head, &poll->wait); | |
4797 | else | |
4798 | add_wait_queue(head, &poll->wait); | |
18bceab1 JA |
4799 | } |
4800 | ||
4801 | static void io_async_queue_proc(struct file *file, struct wait_queue_head *head, | |
4802 | struct poll_table_struct *p) | |
4803 | { | |
4804 | struct io_poll_table *pt = container_of(p, struct io_poll_table, pt); | |
807abcb0 | 4805 | struct async_poll *apoll = pt->req->apoll; |
18bceab1 | 4806 | |
807abcb0 | 4807 | __io_queue_proc(&apoll->poll, pt, head, &apoll->double_poll); |
18bceab1 JA |
4808 | } |
4809 | ||
d7718a9d JA |
4810 | static void io_async_task_func(struct callback_head *cb) |
4811 | { | |
4812 | struct io_kiocb *req = container_of(cb, struct io_kiocb, task_work); | |
4813 | struct async_poll *apoll = req->apoll; | |
4814 | struct io_ring_ctx *ctx = req->ctx; | |
4815 | ||
4816 | trace_io_uring_task_run(req->ctx, req->opcode, req->user_data); | |
4817 | ||
74ce6ce4 | 4818 | if (io_poll_rewait(req, &apoll->poll)) { |
d7718a9d | 4819 | spin_unlock_irq(&ctx->completion_lock); |
6d816e08 | 4820 | percpu_ref_put(&ctx->refs); |
74ce6ce4 | 4821 | return; |
d7718a9d JA |
4822 | } |
4823 | ||
31067255 | 4824 | /* If req is still hashed, it cannot have been canceled. Don't check. */ |
0be0b0e3 | 4825 | if (hash_hashed(&req->hash_node)) |
74ce6ce4 | 4826 | hash_del(&req->hash_node); |
2bae047e | 4827 | |
d4e7cd36 | 4828 | io_poll_remove_double(req); |
74ce6ce4 JA |
4829 | spin_unlock_irq(&ctx->completion_lock); |
4830 | ||
0be0b0e3 PB |
4831 | if (!READ_ONCE(apoll->poll.canceled)) |
4832 | __io_req_task_submit(req); | |
4833 | else | |
4834 | __io_req_task_cancel(req, -ECANCELED); | |
aa340845 | 4835 | |
6d816e08 | 4836 | percpu_ref_put(&ctx->refs); |
807abcb0 | 4837 | kfree(apoll->double_poll); |
31067255 | 4838 | kfree(apoll); |
d7718a9d JA |
4839 | } |
4840 | ||
4841 | static int io_async_wake(struct wait_queue_entry *wait, unsigned mode, int sync, | |
4842 | void *key) | |
4843 | { | |
4844 | struct io_kiocb *req = wait->private; | |
4845 | struct io_poll_iocb *poll = &req->apoll->poll; | |
4846 | ||
4847 | trace_io_uring_poll_wake(req->ctx, req->opcode, req->user_data, | |
4848 | key_to_poll(key)); | |
4849 | ||
4850 | return __io_async_wake(req, poll, key_to_poll(key), io_async_task_func); | |
4851 | } | |
4852 | ||
4853 | static void io_poll_req_insert(struct io_kiocb *req) | |
4854 | { | |
4855 | struct io_ring_ctx *ctx = req->ctx; | |
4856 | struct hlist_head *list; | |
4857 | ||
4858 | list = &ctx->cancel_hash[hash_long(req->user_data, ctx->cancel_hash_bits)]; | |
4859 | hlist_add_head(&req->hash_node, list); | |
4860 | } | |
4861 | ||
4862 | static __poll_t __io_arm_poll_handler(struct io_kiocb *req, | |
4863 | struct io_poll_iocb *poll, | |
4864 | struct io_poll_table *ipt, __poll_t mask, | |
4865 | wait_queue_func_t wake_func) | |
4866 | __acquires(&ctx->completion_lock) | |
4867 | { | |
4868 | struct io_ring_ctx *ctx = req->ctx; | |
4869 | bool cancel = false; | |
4870 | ||
18bceab1 | 4871 | io_init_poll_iocb(poll, mask, wake_func); |
b90cd197 | 4872 | poll->file = req->file; |
18bceab1 | 4873 | poll->wait.private = req; |
d7718a9d JA |
4874 | |
4875 | ipt->pt._key = mask; | |
4876 | ipt->req = req; | |
4877 | ipt->error = -EINVAL; | |
4878 | ||
d7718a9d JA |
4879 | mask = vfs_poll(req->file, &ipt->pt) & poll->events; |
4880 | ||
4881 | spin_lock_irq(&ctx->completion_lock); | |
4882 | if (likely(poll->head)) { | |
4883 | spin_lock(&poll->head->lock); | |
4884 | if (unlikely(list_empty(&poll->wait.entry))) { | |
4885 | if (ipt->error) | |
4886 | cancel = true; | |
4887 | ipt->error = 0; | |
4888 | mask = 0; | |
4889 | } | |
4890 | if (mask || ipt->error) | |
4891 | list_del_init(&poll->wait.entry); | |
4892 | else if (cancel) | |
4893 | WRITE_ONCE(poll->canceled, true); | |
4894 | else if (!poll->done) /* actually waiting for an event */ | |
4895 | io_poll_req_insert(req); | |
4896 | spin_unlock(&poll->head->lock); | |
4897 | } | |
4898 | ||
4899 | return mask; | |
4900 | } | |
4901 | ||
4902 | static bool io_arm_poll_handler(struct io_kiocb *req) | |
4903 | { | |
4904 | const struct io_op_def *def = &io_op_defs[req->opcode]; | |
4905 | struct io_ring_ctx *ctx = req->ctx; | |
4906 | struct async_poll *apoll; | |
4907 | struct io_poll_table ipt; | |
4908 | __poll_t mask, ret; | |
4909 | ||
4910 | if (!req->file || !file_can_poll(req->file)) | |
4911 | return false; | |
24c74678 | 4912 | if (req->flags & REQ_F_POLLED) |
d7718a9d JA |
4913 | return false; |
4914 | if (!def->pollin && !def->pollout) | |
4915 | return false; | |
4916 | ||
4917 | apoll = kmalloc(sizeof(*apoll), GFP_ATOMIC); | |
4918 | if (unlikely(!apoll)) | |
4919 | return false; | |
807abcb0 | 4920 | apoll->double_poll = NULL; |
d7718a9d JA |
4921 | |
4922 | req->flags |= REQ_F_POLLED; | |
4dd2824d | 4923 | io_get_req_task(req); |
d7718a9d JA |
4924 | req->apoll = apoll; |
4925 | INIT_HLIST_NODE(&req->hash_node); | |
4926 | ||
8755d97a | 4927 | mask = 0; |
d7718a9d | 4928 | if (def->pollin) |
8755d97a | 4929 | mask |= POLLIN | POLLRDNORM; |
d7718a9d JA |
4930 | if (def->pollout) |
4931 | mask |= POLLOUT | POLLWRNORM; | |
4932 | mask |= POLLERR | POLLPRI; | |
4933 | ||
4934 | ipt.pt._qproc = io_async_queue_proc; | |
4935 | ||
4936 | ret = __io_arm_poll_handler(req, &apoll->poll, &ipt, mask, | |
4937 | io_async_wake); | |
a36da65c | 4938 | if (ret || ipt.error) { |
d4e7cd36 | 4939 | io_poll_remove_double(req); |
d7718a9d | 4940 | spin_unlock_irq(&ctx->completion_lock); |
807abcb0 | 4941 | kfree(apoll->double_poll); |
d7718a9d JA |
4942 | kfree(apoll); |
4943 | return false; | |
4944 | } | |
4945 | spin_unlock_irq(&ctx->completion_lock); | |
4946 | trace_io_uring_poll_arm(ctx, req->opcode, req->user_data, mask, | |
4947 | apoll->poll.events); | |
4948 | return true; | |
4949 | } | |
4950 | ||
4951 | static bool __io_poll_remove_one(struct io_kiocb *req, | |
4952 | struct io_poll_iocb *poll) | |
221c5eb2 | 4953 | { |
b41e9852 | 4954 | bool do_complete = false; |
221c5eb2 JA |
4955 | |
4956 | spin_lock(&poll->head->lock); | |
4957 | WRITE_ONCE(poll->canceled, true); | |
392edb45 JA |
4958 | if (!list_empty(&poll->wait.entry)) { |
4959 | list_del_init(&poll->wait.entry); | |
b41e9852 | 4960 | do_complete = true; |
221c5eb2 JA |
4961 | } |
4962 | spin_unlock(&poll->head->lock); | |
3bfa5bcb | 4963 | hash_del(&req->hash_node); |
d7718a9d JA |
4964 | return do_complete; |
4965 | } | |
4966 | ||
4967 | static bool io_poll_remove_one(struct io_kiocb *req) | |
4968 | { | |
4969 | bool do_complete; | |
4970 | ||
d4e7cd36 JA |
4971 | io_poll_remove_double(req); |
4972 | ||
d7718a9d JA |
4973 | if (req->opcode == IORING_OP_POLL_ADD) { |
4974 | do_complete = __io_poll_remove_one(req, &req->poll); | |
4975 | } else { | |
3bfa5bcb JA |
4976 | struct async_poll *apoll = req->apoll; |
4977 | ||
d7718a9d | 4978 | /* non-poll requests have submit ref still */ |
3bfa5bcb JA |
4979 | do_complete = __io_poll_remove_one(req, &apoll->poll); |
4980 | if (do_complete) { | |
d7718a9d | 4981 | io_put_req(req); |
807abcb0 | 4982 | kfree(apoll->double_poll); |
3bfa5bcb JA |
4983 | kfree(apoll); |
4984 | } | |
b1f573bd XW |
4985 | } |
4986 | ||
b41e9852 JA |
4987 | if (do_complete) { |
4988 | io_cqring_fill_event(req, -ECANCELED); | |
4989 | io_commit_cqring(req->ctx); | |
4990 | req->flags |= REQ_F_COMP_LOCKED; | |
f254ac04 | 4991 | req_set_fail_links(req); |
b41e9852 JA |
4992 | io_put_req(req); |
4993 | } | |
4994 | ||
4995 | return do_complete; | |
221c5eb2 JA |
4996 | } |
4997 | ||
4998 | static void io_poll_remove_all(struct io_ring_ctx *ctx) | |
4999 | { | |
78076bb6 | 5000 | struct hlist_node *tmp; |
221c5eb2 | 5001 | struct io_kiocb *req; |
8e2e1faf | 5002 | int posted = 0, i; |
221c5eb2 JA |
5003 | |
5004 | spin_lock_irq(&ctx->completion_lock); | |
78076bb6 JA |
5005 | for (i = 0; i < (1U << ctx->cancel_hash_bits); i++) { |
5006 | struct hlist_head *list; | |
5007 | ||
5008 | list = &ctx->cancel_hash[i]; | |
5009 | hlist_for_each_entry_safe(req, tmp, list, hash_node) | |
8e2e1faf | 5010 | posted += io_poll_remove_one(req); |
221c5eb2 JA |
5011 | } |
5012 | spin_unlock_irq(&ctx->completion_lock); | |
b41e9852 | 5013 | |
8e2e1faf JA |
5014 | if (posted) |
5015 | io_cqring_ev_posted(ctx); | |
221c5eb2 JA |
5016 | } |
5017 | ||
47f46768 JA |
5018 | static int io_poll_cancel(struct io_ring_ctx *ctx, __u64 sqe_addr) |
5019 | { | |
78076bb6 | 5020 | struct hlist_head *list; |
47f46768 JA |
5021 | struct io_kiocb *req; |
5022 | ||
78076bb6 JA |
5023 | list = &ctx->cancel_hash[hash_long(sqe_addr, ctx->cancel_hash_bits)]; |
5024 | hlist_for_each_entry(req, list, hash_node) { | |
b41e9852 JA |
5025 | if (sqe_addr != req->user_data) |
5026 | continue; | |
5027 | if (io_poll_remove_one(req)) | |
eac406c6 | 5028 | return 0; |
b41e9852 | 5029 | return -EALREADY; |
47f46768 JA |
5030 | } |
5031 | ||
5032 | return -ENOENT; | |
5033 | } | |
5034 | ||
3529d8c2 JA |
5035 | static int io_poll_remove_prep(struct io_kiocb *req, |
5036 | const struct io_uring_sqe *sqe) | |
0969e783 | 5037 | { |
0969e783 JA |
5038 | if (unlikely(req->ctx->flags & IORING_SETUP_IOPOLL)) |
5039 | return -EINVAL; | |
5040 | if (sqe->ioprio || sqe->off || sqe->len || sqe->buf_index || | |
5041 | sqe->poll_events) | |
5042 | return -EINVAL; | |
5043 | ||
5044 | req->poll.addr = READ_ONCE(sqe->addr); | |
0969e783 JA |
5045 | return 0; |
5046 | } | |
5047 | ||
221c5eb2 JA |
5048 | /* |
5049 | * Find a running poll command that matches one specified in sqe->addr, | |
5050 | * and remove it if found. | |
5051 | */ | |
fc4df999 | 5052 | static int io_poll_remove(struct io_kiocb *req) |
221c5eb2 JA |
5053 | { |
5054 | struct io_ring_ctx *ctx = req->ctx; | |
0969e783 | 5055 | u64 addr; |
47f46768 | 5056 | int ret; |
221c5eb2 | 5057 | |
0969e783 | 5058 | addr = req->poll.addr; |
221c5eb2 | 5059 | spin_lock_irq(&ctx->completion_lock); |
0969e783 | 5060 | ret = io_poll_cancel(ctx, addr); |
221c5eb2 JA |
5061 | spin_unlock_irq(&ctx->completion_lock); |
5062 | ||
4e88d6e7 JA |
5063 | if (ret < 0) |
5064 | req_set_fail_links(req); | |
e1e16097 | 5065 | io_req_complete(req, ret); |
221c5eb2 JA |
5066 | return 0; |
5067 | } | |
5068 | ||
221c5eb2 JA |
5069 | static int io_poll_wake(struct wait_queue_entry *wait, unsigned mode, int sync, |
5070 | void *key) | |
5071 | { | |
c2f2eb7d JA |
5072 | struct io_kiocb *req = wait->private; |
5073 | struct io_poll_iocb *poll = &req->poll; | |
221c5eb2 | 5074 | |
d7718a9d | 5075 | return __io_async_wake(req, poll, key_to_poll(key), io_poll_task_func); |
221c5eb2 JA |
5076 | } |
5077 | ||
221c5eb2 JA |
5078 | static void io_poll_queue_proc(struct file *file, struct wait_queue_head *head, |
5079 | struct poll_table_struct *p) | |
5080 | { | |
5081 | struct io_poll_table *pt = container_of(p, struct io_poll_table, pt); | |
5082 | ||
807abcb0 | 5083 | __io_queue_proc(&pt->req->poll, pt, head, (struct io_poll_iocb **) &pt->req->io); |
eac406c6 JA |
5084 | } |
5085 | ||
3529d8c2 | 5086 | static int io_poll_add_prep(struct io_kiocb *req, const struct io_uring_sqe *sqe) |
221c5eb2 JA |
5087 | { |
5088 | struct io_poll_iocb *poll = &req->poll; | |
5769a351 | 5089 | u32 events; |
221c5eb2 JA |
5090 | |
5091 | if (unlikely(req->ctx->flags & IORING_SETUP_IOPOLL)) | |
5092 | return -EINVAL; | |
5093 | if (sqe->addr || sqe->ioprio || sqe->off || sqe->len || sqe->buf_index) | |
5094 | return -EINVAL; | |
09bb8394 JA |
5095 | if (!poll->file) |
5096 | return -EBADF; | |
221c5eb2 | 5097 | |
5769a351 JX |
5098 | events = READ_ONCE(sqe->poll32_events); |
5099 | #ifdef __BIG_ENDIAN | |
5100 | events = swahw32(events); | |
5101 | #endif | |
a31eb4a2 JX |
5102 | poll->events = demangle_poll(events) | EPOLLERR | EPOLLHUP | |
5103 | (events & EPOLLEXCLUSIVE); | |
b41e9852 | 5104 | |
4dd2824d | 5105 | io_get_req_task(req); |
0969e783 JA |
5106 | return 0; |
5107 | } | |
5108 | ||
014db007 | 5109 | static int io_poll_add(struct io_kiocb *req) |
0969e783 JA |
5110 | { |
5111 | struct io_poll_iocb *poll = &req->poll; | |
5112 | struct io_ring_ctx *ctx = req->ctx; | |
5113 | struct io_poll_table ipt; | |
0969e783 | 5114 | __poll_t mask; |
0969e783 | 5115 | |
78076bb6 | 5116 | INIT_HLIST_NODE(&req->hash_node); |
d7718a9d | 5117 | ipt.pt._qproc = io_poll_queue_proc; |
36703247 | 5118 | |
d7718a9d JA |
5119 | mask = __io_arm_poll_handler(req, &req->poll, &ipt, poll->events, |
5120 | io_poll_wake); | |
221c5eb2 | 5121 | |
8c838788 | 5122 | if (mask) { /* no async, we'd stolen it */ |
221c5eb2 | 5123 | ipt.error = 0; |
b0dd8a41 | 5124 | io_poll_complete(req, mask, 0); |
221c5eb2 | 5125 | } |
221c5eb2 JA |
5126 | spin_unlock_irq(&ctx->completion_lock); |
5127 | ||
8c838788 JA |
5128 | if (mask) { |
5129 | io_cqring_ev_posted(ctx); | |
014db007 | 5130 | io_put_req(req); |
221c5eb2 | 5131 | } |
8c838788 | 5132 | return ipt.error; |
221c5eb2 JA |
5133 | } |
5134 | ||
5262f567 JA |
5135 | static enum hrtimer_restart io_timeout_fn(struct hrtimer *timer) |
5136 | { | |
ad8a48ac JA |
5137 | struct io_timeout_data *data = container_of(timer, |
5138 | struct io_timeout_data, timer); | |
5139 | struct io_kiocb *req = data->req; | |
5140 | struct io_ring_ctx *ctx = req->ctx; | |
5262f567 JA |
5141 | unsigned long flags; |
5142 | ||
5262f567 | 5143 | spin_lock_irqsave(&ctx->completion_lock, flags); |
01cec8c1 PB |
5144 | atomic_set(&req->ctx->cq_timeouts, |
5145 | atomic_read(&req->ctx->cq_timeouts) + 1); | |
5146 | ||
ef03681a | 5147 | /* |
11365043 JA |
5148 | * We could be racing with timeout deletion. If the list is empty, |
5149 | * then timeout lookup already found it and will be handling it. | |
ef03681a | 5150 | */ |
135fcde8 PB |
5151 | if (!list_empty(&req->timeout.list)) |
5152 | list_del_init(&req->timeout.list); | |
5262f567 | 5153 | |
78e19bbe | 5154 | io_cqring_fill_event(req, -ETIME); |
5262f567 JA |
5155 | io_commit_cqring(ctx); |
5156 | spin_unlock_irqrestore(&ctx->completion_lock, flags); | |
5157 | ||
5158 | io_cqring_ev_posted(ctx); | |
4e88d6e7 | 5159 | req_set_fail_links(req); |
5262f567 JA |
5160 | io_put_req(req); |
5161 | return HRTIMER_NORESTART; | |
5162 | } | |
5163 | ||
f254ac04 JA |
5164 | static int __io_timeout_cancel(struct io_kiocb *req) |
5165 | { | |
5166 | int ret; | |
5167 | ||
5168 | list_del_init(&req->timeout.list); | |
5169 | ||
5170 | ret = hrtimer_try_to_cancel(&req->io->timeout.timer); | |
5171 | if (ret == -1) | |
5172 | return -EALREADY; | |
5173 | ||
5174 | req_set_fail_links(req); | |
5175 | req->flags |= REQ_F_COMP_LOCKED; | |
5176 | io_cqring_fill_event(req, -ECANCELED); | |
5177 | io_put_req(req); | |
5178 | return 0; | |
5179 | } | |
5180 | ||
47f46768 JA |
5181 | static int io_timeout_cancel(struct io_ring_ctx *ctx, __u64 user_data) |
5182 | { | |
5183 | struct io_kiocb *req; | |
5184 | int ret = -ENOENT; | |
5185 | ||
135fcde8 | 5186 | list_for_each_entry(req, &ctx->timeout_list, timeout.list) { |
47f46768 | 5187 | if (user_data == req->user_data) { |
47f46768 JA |
5188 | ret = 0; |
5189 | break; | |
5190 | } | |
5191 | } | |
5192 | ||
5193 | if (ret == -ENOENT) | |
5194 | return ret; | |
5195 | ||
f254ac04 | 5196 | return __io_timeout_cancel(req); |
47f46768 JA |
5197 | } |
5198 | ||
3529d8c2 JA |
5199 | static int io_timeout_remove_prep(struct io_kiocb *req, |
5200 | const struct io_uring_sqe *sqe) | |
b29472ee | 5201 | { |
b29472ee JA |
5202 | if (unlikely(req->ctx->flags & IORING_SETUP_IOPOLL)) |
5203 | return -EINVAL; | |
61710e43 DA |
5204 | if (unlikely(req->flags & (REQ_F_FIXED_FILE | REQ_F_BUFFER_SELECT))) |
5205 | return -EINVAL; | |
5206 | if (sqe->ioprio || sqe->buf_index || sqe->len) | |
b29472ee JA |
5207 | return -EINVAL; |
5208 | ||
5209 | req->timeout.addr = READ_ONCE(sqe->addr); | |
5210 | req->timeout.flags = READ_ONCE(sqe->timeout_flags); | |
5211 | if (req->timeout.flags) | |
5212 | return -EINVAL; | |
5213 | ||
b29472ee JA |
5214 | return 0; |
5215 | } | |
5216 | ||
11365043 JA |
5217 | /* |
5218 | * Remove or update an existing timeout command | |
5219 | */ | |
fc4df999 | 5220 | static int io_timeout_remove(struct io_kiocb *req) |
11365043 JA |
5221 | { |
5222 | struct io_ring_ctx *ctx = req->ctx; | |
47f46768 | 5223 | int ret; |
11365043 | 5224 | |
11365043 | 5225 | spin_lock_irq(&ctx->completion_lock); |
b29472ee | 5226 | ret = io_timeout_cancel(ctx, req->timeout.addr); |
11365043 | 5227 | |
47f46768 | 5228 | io_cqring_fill_event(req, ret); |
11365043 JA |
5229 | io_commit_cqring(ctx); |
5230 | spin_unlock_irq(&ctx->completion_lock); | |
5262f567 | 5231 | io_cqring_ev_posted(ctx); |
4e88d6e7 JA |
5232 | if (ret < 0) |
5233 | req_set_fail_links(req); | |
ec9c02ad | 5234 | io_put_req(req); |
11365043 | 5235 | return 0; |
5262f567 JA |
5236 | } |
5237 | ||
3529d8c2 | 5238 | static int io_timeout_prep(struct io_kiocb *req, const struct io_uring_sqe *sqe, |
2d28390a | 5239 | bool is_timeout_link) |
5262f567 | 5240 | { |
ad8a48ac | 5241 | struct io_timeout_data *data; |
a41525ab | 5242 | unsigned flags; |
56080b02 | 5243 | u32 off = READ_ONCE(sqe->off); |
5262f567 | 5244 | |
ad8a48ac | 5245 | if (unlikely(req->ctx->flags & IORING_SETUP_IOPOLL)) |
5262f567 | 5246 | return -EINVAL; |
ad8a48ac | 5247 | if (sqe->ioprio || sqe->buf_index || sqe->len != 1) |
a41525ab | 5248 | return -EINVAL; |
56080b02 | 5249 | if (off && is_timeout_link) |
2d28390a | 5250 | return -EINVAL; |
a41525ab JA |
5251 | flags = READ_ONCE(sqe->timeout_flags); |
5252 | if (flags & ~IORING_TIMEOUT_ABS) | |
5262f567 | 5253 | return -EINVAL; |
bdf20073 | 5254 | |
bfe68a22 | 5255 | req->timeout.off = off; |
26a61679 | 5256 | |
3529d8c2 | 5257 | if (!req->io && io_alloc_async_ctx(req)) |
26a61679 JA |
5258 | return -ENOMEM; |
5259 | ||
5260 | data = &req->io->timeout; | |
ad8a48ac | 5261 | data->req = req; |
ad8a48ac JA |
5262 | |
5263 | if (get_timespec64(&data->ts, u64_to_user_ptr(sqe->addr))) | |
5262f567 JA |
5264 | return -EFAULT; |
5265 | ||
11365043 | 5266 | if (flags & IORING_TIMEOUT_ABS) |
ad8a48ac | 5267 | data->mode = HRTIMER_MODE_ABS; |
11365043 | 5268 | else |
ad8a48ac | 5269 | data->mode = HRTIMER_MODE_REL; |
11365043 | 5270 | |
ad8a48ac JA |
5271 | hrtimer_init(&data->timer, CLOCK_MONOTONIC, data->mode); |
5272 | return 0; | |
5273 | } | |
5274 | ||
fc4df999 | 5275 | static int io_timeout(struct io_kiocb *req) |
ad8a48ac | 5276 | { |
ad8a48ac | 5277 | struct io_ring_ctx *ctx = req->ctx; |
bfe68a22 | 5278 | struct io_timeout_data *data = &req->io->timeout; |
ad8a48ac | 5279 | struct list_head *entry; |
bfe68a22 | 5280 | u32 tail, off = req->timeout.off; |
ad8a48ac | 5281 | |
733f5c95 | 5282 | spin_lock_irq(&ctx->completion_lock); |
93bd25bb | 5283 | |
5262f567 JA |
5284 | /* |
5285 | * sqe->off holds how many events that need to occur for this | |
93bd25bb JA |
5286 | * timeout event to be satisfied. If it isn't set, then this is |
5287 | * a pure timeout request, sequence isn't used. | |
5262f567 | 5288 | */ |
8eb7e2d0 | 5289 | if (io_is_timeout_noseq(req)) { |
93bd25bb JA |
5290 | entry = ctx->timeout_list.prev; |
5291 | goto add; | |
5292 | } | |
5262f567 | 5293 | |
bfe68a22 PB |
5294 | tail = ctx->cached_cq_tail - atomic_read(&ctx->cq_timeouts); |
5295 | req->timeout.target_seq = tail + off; | |
5262f567 JA |
5296 | |
5297 | /* | |
5298 | * Insertion sort, ensuring the first entry in the list is always | |
5299 | * the one we need first. | |
5300 | */ | |
5262f567 | 5301 | list_for_each_prev(entry, &ctx->timeout_list) { |
135fcde8 PB |
5302 | struct io_kiocb *nxt = list_entry(entry, struct io_kiocb, |
5303 | timeout.list); | |
5262f567 | 5304 | |
8eb7e2d0 | 5305 | if (io_is_timeout_noseq(nxt)) |
93bd25bb | 5306 | continue; |
bfe68a22 PB |
5307 | /* nxt.seq is behind @tail, otherwise would've been completed */ |
5308 | if (off >= nxt->timeout.target_seq - tail) | |
5262f567 JA |
5309 | break; |
5310 | } | |
93bd25bb | 5311 | add: |
135fcde8 | 5312 | list_add(&req->timeout.list, entry); |
ad8a48ac JA |
5313 | data->timer.function = io_timeout_fn; |
5314 | hrtimer_start(&data->timer, timespec64_to_ktime(data->ts), data->mode); | |
5262f567 | 5315 | spin_unlock_irq(&ctx->completion_lock); |
5262f567 JA |
5316 | return 0; |
5317 | } | |
5262f567 | 5318 | |
62755e35 JA |
5319 | static bool io_cancel_cb(struct io_wq_work *work, void *data) |
5320 | { | |
5321 | struct io_kiocb *req = container_of(work, struct io_kiocb, work); | |
5322 | ||
5323 | return req->user_data == (unsigned long) data; | |
5324 | } | |
5325 | ||
e977d6d3 | 5326 | static int io_async_cancel_one(struct io_ring_ctx *ctx, void *sqe_addr) |
62755e35 | 5327 | { |
62755e35 | 5328 | enum io_wq_cancel cancel_ret; |
62755e35 JA |
5329 | int ret = 0; |
5330 | ||
4f26bda1 | 5331 | cancel_ret = io_wq_cancel_cb(ctx->io_wq, io_cancel_cb, sqe_addr, false); |
62755e35 JA |
5332 | switch (cancel_ret) { |
5333 | case IO_WQ_CANCEL_OK: | |
5334 | ret = 0; | |
5335 | break; | |
5336 | case IO_WQ_CANCEL_RUNNING: | |
5337 | ret = -EALREADY; | |
5338 | break; | |
5339 | case IO_WQ_CANCEL_NOTFOUND: | |
5340 | ret = -ENOENT; | |
5341 | break; | |
5342 | } | |
5343 | ||
e977d6d3 JA |
5344 | return ret; |
5345 | } | |
5346 | ||
47f46768 JA |
5347 | static void io_async_find_and_cancel(struct io_ring_ctx *ctx, |
5348 | struct io_kiocb *req, __u64 sqe_addr, | |
014db007 | 5349 | int success_ret) |
47f46768 JA |
5350 | { |
5351 | unsigned long flags; | |
5352 | int ret; | |
5353 | ||
5354 | ret = io_async_cancel_one(ctx, (void *) (unsigned long) sqe_addr); | |
5355 | if (ret != -ENOENT) { | |
5356 | spin_lock_irqsave(&ctx->completion_lock, flags); | |
5357 | goto done; | |
5358 | } | |
5359 | ||
5360 | spin_lock_irqsave(&ctx->completion_lock, flags); | |
5361 | ret = io_timeout_cancel(ctx, sqe_addr); | |
5362 | if (ret != -ENOENT) | |
5363 | goto done; | |
5364 | ret = io_poll_cancel(ctx, sqe_addr); | |
5365 | done: | |
b0dd8a41 JA |
5366 | if (!ret) |
5367 | ret = success_ret; | |
47f46768 JA |
5368 | io_cqring_fill_event(req, ret); |
5369 | io_commit_cqring(ctx); | |
5370 | spin_unlock_irqrestore(&ctx->completion_lock, flags); | |
5371 | io_cqring_ev_posted(ctx); | |
5372 | ||
4e88d6e7 JA |
5373 | if (ret < 0) |
5374 | req_set_fail_links(req); | |
014db007 | 5375 | io_put_req(req); |
47f46768 JA |
5376 | } |
5377 | ||
3529d8c2 JA |
5378 | static int io_async_cancel_prep(struct io_kiocb *req, |
5379 | const struct io_uring_sqe *sqe) | |
e977d6d3 | 5380 | { |
fbf23849 | 5381 | if (unlikely(req->ctx->flags & IORING_SETUP_IOPOLL)) |
e977d6d3 | 5382 | return -EINVAL; |
61710e43 DA |
5383 | if (unlikely(req->flags & (REQ_F_FIXED_FILE | REQ_F_BUFFER_SELECT))) |
5384 | return -EINVAL; | |
5385 | if (sqe->ioprio || sqe->off || sqe->len || sqe->cancel_flags) | |
e977d6d3 JA |
5386 | return -EINVAL; |
5387 | ||
fbf23849 JA |
5388 | req->cancel.addr = READ_ONCE(sqe->addr); |
5389 | return 0; | |
5390 | } | |
5391 | ||
014db007 | 5392 | static int io_async_cancel(struct io_kiocb *req) |
fbf23849 JA |
5393 | { |
5394 | struct io_ring_ctx *ctx = req->ctx; | |
fbf23849 | 5395 | |
014db007 | 5396 | io_async_find_and_cancel(ctx, req, req->cancel.addr, 0); |
5262f567 JA |
5397 | return 0; |
5398 | } | |
5399 | ||
05f3fb3c JA |
5400 | static int io_files_update_prep(struct io_kiocb *req, |
5401 | const struct io_uring_sqe *sqe) | |
5402 | { | |
61710e43 DA |
5403 | if (unlikely(req->flags & (REQ_F_FIXED_FILE | REQ_F_BUFFER_SELECT))) |
5404 | return -EINVAL; | |
5405 | if (sqe->ioprio || sqe->rw_flags) | |
05f3fb3c JA |
5406 | return -EINVAL; |
5407 | ||
5408 | req->files_update.offset = READ_ONCE(sqe->off); | |
5409 | req->files_update.nr_args = READ_ONCE(sqe->len); | |
5410 | if (!req->files_update.nr_args) | |
5411 | return -EINVAL; | |
5412 | req->files_update.arg = READ_ONCE(sqe->addr); | |
5413 | return 0; | |
5414 | } | |
5415 | ||
229a7b63 JA |
5416 | static int io_files_update(struct io_kiocb *req, bool force_nonblock, |
5417 | struct io_comp_state *cs) | |
fbf23849 JA |
5418 | { |
5419 | struct io_ring_ctx *ctx = req->ctx; | |
05f3fb3c JA |
5420 | struct io_uring_files_update up; |
5421 | int ret; | |
fbf23849 | 5422 | |
f86cd20c | 5423 | if (force_nonblock) |
05f3fb3c | 5424 | return -EAGAIN; |
05f3fb3c JA |
5425 | |
5426 | up.offset = req->files_update.offset; | |
5427 | up.fds = req->files_update.arg; | |
5428 | ||
5429 | mutex_lock(&ctx->uring_lock); | |
5430 | ret = __io_sqe_files_update(ctx, &up, req->files_update.nr_args); | |
5431 | mutex_unlock(&ctx->uring_lock); | |
5432 | ||
5433 | if (ret < 0) | |
5434 | req_set_fail_links(req); | |
229a7b63 | 5435 | __io_req_complete(req, ret, 0, cs); |
5262f567 JA |
5436 | return 0; |
5437 | } | |
5438 | ||
3529d8c2 JA |
5439 | static int io_req_defer_prep(struct io_kiocb *req, |
5440 | const struct io_uring_sqe *sqe) | |
f67676d1 | 5441 | { |
e781573e | 5442 | ssize_t ret = 0; |
f67676d1 | 5443 | |
f1d96a8f PB |
5444 | if (!sqe) |
5445 | return 0; | |
5446 | ||
327d6d96 PB |
5447 | if (io_alloc_async_ctx(req)) |
5448 | return -EAGAIN; | |
f56040b8 PB |
5449 | ret = io_prep_work_files(req); |
5450 | if (unlikely(ret)) | |
5451 | return ret; | |
cccf0ee8 | 5452 | |
d625c6ee | 5453 | switch (req->opcode) { |
e781573e JA |
5454 | case IORING_OP_NOP: |
5455 | break; | |
f67676d1 JA |
5456 | case IORING_OP_READV: |
5457 | case IORING_OP_READ_FIXED: | |
3a6820f2 | 5458 | case IORING_OP_READ: |
3529d8c2 | 5459 | ret = io_read_prep(req, sqe, true); |
f67676d1 JA |
5460 | break; |
5461 | case IORING_OP_WRITEV: | |
5462 | case IORING_OP_WRITE_FIXED: | |
3a6820f2 | 5463 | case IORING_OP_WRITE: |
3529d8c2 | 5464 | ret = io_write_prep(req, sqe, true); |
f67676d1 | 5465 | break; |
0969e783 | 5466 | case IORING_OP_POLL_ADD: |
3529d8c2 | 5467 | ret = io_poll_add_prep(req, sqe); |
0969e783 JA |
5468 | break; |
5469 | case IORING_OP_POLL_REMOVE: | |
3529d8c2 | 5470 | ret = io_poll_remove_prep(req, sqe); |
0969e783 | 5471 | break; |
8ed8d3c3 | 5472 | case IORING_OP_FSYNC: |
3529d8c2 | 5473 | ret = io_prep_fsync(req, sqe); |
8ed8d3c3 JA |
5474 | break; |
5475 | case IORING_OP_SYNC_FILE_RANGE: | |
3529d8c2 | 5476 | ret = io_prep_sfr(req, sqe); |
8ed8d3c3 | 5477 | break; |
03b1230c | 5478 | case IORING_OP_SENDMSG: |
fddaface | 5479 | case IORING_OP_SEND: |
3529d8c2 | 5480 | ret = io_sendmsg_prep(req, sqe); |
03b1230c JA |
5481 | break; |
5482 | case IORING_OP_RECVMSG: | |
fddaface | 5483 | case IORING_OP_RECV: |
3529d8c2 | 5484 | ret = io_recvmsg_prep(req, sqe); |
03b1230c | 5485 | break; |
f499a021 | 5486 | case IORING_OP_CONNECT: |
3529d8c2 | 5487 | ret = io_connect_prep(req, sqe); |
f499a021 | 5488 | break; |
2d28390a | 5489 | case IORING_OP_TIMEOUT: |
3529d8c2 | 5490 | ret = io_timeout_prep(req, sqe, false); |
b7bb4f7d | 5491 | break; |
b29472ee | 5492 | case IORING_OP_TIMEOUT_REMOVE: |
3529d8c2 | 5493 | ret = io_timeout_remove_prep(req, sqe); |
b29472ee | 5494 | break; |
fbf23849 | 5495 | case IORING_OP_ASYNC_CANCEL: |
3529d8c2 | 5496 | ret = io_async_cancel_prep(req, sqe); |
fbf23849 | 5497 | break; |
2d28390a | 5498 | case IORING_OP_LINK_TIMEOUT: |
3529d8c2 | 5499 | ret = io_timeout_prep(req, sqe, true); |
b7bb4f7d | 5500 | break; |
8ed8d3c3 | 5501 | case IORING_OP_ACCEPT: |
3529d8c2 | 5502 | ret = io_accept_prep(req, sqe); |
8ed8d3c3 | 5503 | break; |
d63d1b5e JA |
5504 | case IORING_OP_FALLOCATE: |
5505 | ret = io_fallocate_prep(req, sqe); | |
5506 | break; | |
15b71abe JA |
5507 | case IORING_OP_OPENAT: |
5508 | ret = io_openat_prep(req, sqe); | |
5509 | break; | |
b5dba59e JA |
5510 | case IORING_OP_CLOSE: |
5511 | ret = io_close_prep(req, sqe); | |
5512 | break; | |
05f3fb3c JA |
5513 | case IORING_OP_FILES_UPDATE: |
5514 | ret = io_files_update_prep(req, sqe); | |
5515 | break; | |
eddc7ef5 JA |
5516 | case IORING_OP_STATX: |
5517 | ret = io_statx_prep(req, sqe); | |
5518 | break; | |
4840e418 JA |
5519 | case IORING_OP_FADVISE: |
5520 | ret = io_fadvise_prep(req, sqe); | |
5521 | break; | |
c1ca757b JA |
5522 | case IORING_OP_MADVISE: |
5523 | ret = io_madvise_prep(req, sqe); | |
5524 | break; | |
cebdb986 JA |
5525 | case IORING_OP_OPENAT2: |
5526 | ret = io_openat2_prep(req, sqe); | |
5527 | break; | |
3e4827b0 JA |
5528 | case IORING_OP_EPOLL_CTL: |
5529 | ret = io_epoll_ctl_prep(req, sqe); | |
5530 | break; | |
7d67af2c PB |
5531 | case IORING_OP_SPLICE: |
5532 | ret = io_splice_prep(req, sqe); | |
5533 | break; | |
ddf0322d JA |
5534 | case IORING_OP_PROVIDE_BUFFERS: |
5535 | ret = io_provide_buffers_prep(req, sqe); | |
5536 | break; | |
067524e9 JA |
5537 | case IORING_OP_REMOVE_BUFFERS: |
5538 | ret = io_remove_buffers_prep(req, sqe); | |
5539 | break; | |
f2a8d5c7 PB |
5540 | case IORING_OP_TEE: |
5541 | ret = io_tee_prep(req, sqe); | |
5542 | break; | |
f67676d1 | 5543 | default: |
e781573e JA |
5544 | printk_once(KERN_WARNING "io_uring: unhandled opcode %d\n", |
5545 | req->opcode); | |
5546 | ret = -EINVAL; | |
b7bb4f7d | 5547 | break; |
f67676d1 JA |
5548 | } |
5549 | ||
b7bb4f7d | 5550 | return ret; |
f67676d1 JA |
5551 | } |
5552 | ||
9cf7c104 PB |
5553 | static u32 io_get_sequence(struct io_kiocb *req) |
5554 | { | |
5555 | struct io_kiocb *pos; | |
5556 | struct io_ring_ctx *ctx = req->ctx; | |
5557 | u32 total_submitted, nr_reqs = 1; | |
5558 | ||
5559 | if (req->flags & REQ_F_LINK_HEAD) | |
5560 | list_for_each_entry(pos, &req->link_list, link_list) | |
5561 | nr_reqs++; | |
5562 | ||
5563 | total_submitted = ctx->cached_sq_head - ctx->cached_sq_dropped; | |
5564 | return total_submitted - nr_reqs; | |
5565 | } | |
5566 | ||
3529d8c2 | 5567 | static int io_req_defer(struct io_kiocb *req, const struct io_uring_sqe *sqe) |
de0617e4 | 5568 | { |
a197f664 | 5569 | struct io_ring_ctx *ctx = req->ctx; |
27dc8338 | 5570 | struct io_defer_entry *de; |
f67676d1 | 5571 | int ret; |
9cf7c104 | 5572 | u32 seq; |
de0617e4 | 5573 | |
9d858b21 | 5574 | /* Still need defer if there is pending req in defer list. */ |
9cf7c104 PB |
5575 | if (likely(list_empty_careful(&ctx->defer_list) && |
5576 | !(req->flags & REQ_F_IO_DRAIN))) | |
5577 | return 0; | |
5578 | ||
5579 | seq = io_get_sequence(req); | |
5580 | /* Still a chance to pass the sequence check */ | |
5581 | if (!req_need_defer(req, seq) && list_empty_careful(&ctx->defer_list)) | |
de0617e4 JA |
5582 | return 0; |
5583 | ||
650b5481 | 5584 | if (!req->io) { |
650b5481 | 5585 | ret = io_req_defer_prep(req, sqe); |
327d6d96 | 5586 | if (ret) |
650b5481 PB |
5587 | return ret; |
5588 | } | |
cbdcb435 | 5589 | io_prep_async_link(req); |
27dc8338 PB |
5590 | de = kmalloc(sizeof(*de), GFP_KERNEL); |
5591 | if (!de) | |
5592 | return -ENOMEM; | |
2d28390a | 5593 | |
de0617e4 | 5594 | spin_lock_irq(&ctx->completion_lock); |
9cf7c104 | 5595 | if (!req_need_defer(req, seq) && list_empty(&ctx->defer_list)) { |
de0617e4 | 5596 | spin_unlock_irq(&ctx->completion_lock); |
27dc8338 | 5597 | kfree(de); |
ae34817b PB |
5598 | io_queue_async_work(req); |
5599 | return -EIOCBQUEUED; | |
de0617e4 JA |
5600 | } |
5601 | ||
915967f6 | 5602 | trace_io_uring_defer(ctx, req, req->user_data); |
27dc8338 | 5603 | de->req = req; |
9cf7c104 | 5604 | de->seq = seq; |
27dc8338 | 5605 | list_add_tail(&de->list, &ctx->defer_list); |
de0617e4 JA |
5606 | spin_unlock_irq(&ctx->completion_lock); |
5607 | return -EIOCBQUEUED; | |
5608 | } | |
5609 | ||
3ca405eb | 5610 | static void __io_clean_op(struct io_kiocb *req) |
99bc4c38 PB |
5611 | { |
5612 | struct io_async_ctx *io = req->io; | |
5613 | ||
0e1b6fe3 PB |
5614 | if (req->flags & REQ_F_BUFFER_SELECTED) { |
5615 | switch (req->opcode) { | |
5616 | case IORING_OP_READV: | |
5617 | case IORING_OP_READ_FIXED: | |
5618 | case IORING_OP_READ: | |
bcda7baa | 5619 | kfree((void *)(unsigned long)req->rw.addr); |
0e1b6fe3 PB |
5620 | break; |
5621 | case IORING_OP_RECVMSG: | |
5622 | case IORING_OP_RECV: | |
bcda7baa | 5623 | kfree(req->sr_msg.kbuf); |
0e1b6fe3 PB |
5624 | break; |
5625 | } | |
5626 | req->flags &= ~REQ_F_BUFFER_SELECTED; | |
99bc4c38 PB |
5627 | } |
5628 | ||
0e1b6fe3 PB |
5629 | if (req->flags & REQ_F_NEED_CLEANUP) { |
5630 | switch (req->opcode) { | |
5631 | case IORING_OP_READV: | |
5632 | case IORING_OP_READ_FIXED: | |
5633 | case IORING_OP_READ: | |
5634 | case IORING_OP_WRITEV: | |
5635 | case IORING_OP_WRITE_FIXED: | |
5636 | case IORING_OP_WRITE: | |
ff6165b2 JA |
5637 | if (io->rw.free_iovec) |
5638 | kfree(io->rw.free_iovec); | |
0e1b6fe3 PB |
5639 | break; |
5640 | case IORING_OP_RECVMSG: | |
5641 | case IORING_OP_SENDMSG: | |
5642 | if (io->msg.iov != io->msg.fast_iov) | |
5643 | kfree(io->msg.iov); | |
5644 | break; | |
5645 | case IORING_OP_SPLICE: | |
5646 | case IORING_OP_TEE: | |
5647 | io_put_file(req, req->splice.file_in, | |
5648 | (req->splice.flags & SPLICE_F_FD_IN_FIXED)); | |
5649 | break; | |
5650 | } | |
5651 | req->flags &= ~REQ_F_NEED_CLEANUP; | |
99bc4c38 | 5652 | } |
99bc4c38 PB |
5653 | } |
5654 | ||
3529d8c2 | 5655 | static int io_issue_sqe(struct io_kiocb *req, const struct io_uring_sqe *sqe, |
f13fad7b | 5656 | bool force_nonblock, struct io_comp_state *cs) |
2b188cc1 | 5657 | { |
a197f664 | 5658 | struct io_ring_ctx *ctx = req->ctx; |
d625c6ee | 5659 | int ret; |
2b188cc1 | 5660 | |
d625c6ee | 5661 | switch (req->opcode) { |
2b188cc1 | 5662 | case IORING_OP_NOP: |
229a7b63 | 5663 | ret = io_nop(req, cs); |
2b188cc1 JA |
5664 | break; |
5665 | case IORING_OP_READV: | |
edafccee | 5666 | case IORING_OP_READ_FIXED: |
3a6820f2 | 5667 | case IORING_OP_READ: |
3529d8c2 JA |
5668 | if (sqe) { |
5669 | ret = io_read_prep(req, sqe, force_nonblock); | |
5670 | if (ret < 0) | |
5671 | break; | |
5672 | } | |
a1d7c393 | 5673 | ret = io_read(req, force_nonblock, cs); |
edafccee | 5674 | break; |
3529d8c2 | 5675 | case IORING_OP_WRITEV: |
edafccee | 5676 | case IORING_OP_WRITE_FIXED: |
3a6820f2 | 5677 | case IORING_OP_WRITE: |
3529d8c2 JA |
5678 | if (sqe) { |
5679 | ret = io_write_prep(req, sqe, force_nonblock); | |
5680 | if (ret < 0) | |
5681 | break; | |
5682 | } | |
a1d7c393 | 5683 | ret = io_write(req, force_nonblock, cs); |
2b188cc1 | 5684 | break; |
c992fe29 | 5685 | case IORING_OP_FSYNC: |
3529d8c2 JA |
5686 | if (sqe) { |
5687 | ret = io_prep_fsync(req, sqe); | |
5688 | if (ret < 0) | |
5689 | break; | |
5690 | } | |
014db007 | 5691 | ret = io_fsync(req, force_nonblock); |
c992fe29 | 5692 | break; |
221c5eb2 | 5693 | case IORING_OP_POLL_ADD: |
3529d8c2 JA |
5694 | if (sqe) { |
5695 | ret = io_poll_add_prep(req, sqe); | |
5696 | if (ret) | |
5697 | break; | |
5698 | } | |
014db007 | 5699 | ret = io_poll_add(req); |
221c5eb2 JA |
5700 | break; |
5701 | case IORING_OP_POLL_REMOVE: | |
3529d8c2 JA |
5702 | if (sqe) { |
5703 | ret = io_poll_remove_prep(req, sqe); | |
5704 | if (ret < 0) | |
5705 | break; | |
5706 | } | |
fc4df999 | 5707 | ret = io_poll_remove(req); |
221c5eb2 | 5708 | break; |
5d17b4a4 | 5709 | case IORING_OP_SYNC_FILE_RANGE: |
3529d8c2 JA |
5710 | if (sqe) { |
5711 | ret = io_prep_sfr(req, sqe); | |
5712 | if (ret < 0) | |
5713 | break; | |
5714 | } | |
014db007 | 5715 | ret = io_sync_file_range(req, force_nonblock); |
5d17b4a4 | 5716 | break; |
0fa03c62 | 5717 | case IORING_OP_SENDMSG: |
fddaface | 5718 | case IORING_OP_SEND: |
3529d8c2 JA |
5719 | if (sqe) { |
5720 | ret = io_sendmsg_prep(req, sqe); | |
5721 | if (ret < 0) | |
5722 | break; | |
5723 | } | |
fddaface | 5724 | if (req->opcode == IORING_OP_SENDMSG) |
229a7b63 | 5725 | ret = io_sendmsg(req, force_nonblock, cs); |
fddaface | 5726 | else |
229a7b63 | 5727 | ret = io_send(req, force_nonblock, cs); |
0fa03c62 | 5728 | break; |
aa1fa28f | 5729 | case IORING_OP_RECVMSG: |
fddaface | 5730 | case IORING_OP_RECV: |
3529d8c2 JA |
5731 | if (sqe) { |
5732 | ret = io_recvmsg_prep(req, sqe); | |
5733 | if (ret) | |
5734 | break; | |
5735 | } | |
fddaface | 5736 | if (req->opcode == IORING_OP_RECVMSG) |
229a7b63 | 5737 | ret = io_recvmsg(req, force_nonblock, cs); |
fddaface | 5738 | else |
229a7b63 | 5739 | ret = io_recv(req, force_nonblock, cs); |
aa1fa28f | 5740 | break; |
5262f567 | 5741 | case IORING_OP_TIMEOUT: |
3529d8c2 JA |
5742 | if (sqe) { |
5743 | ret = io_timeout_prep(req, sqe, false); | |
5744 | if (ret) | |
5745 | break; | |
5746 | } | |
fc4df999 | 5747 | ret = io_timeout(req); |
5262f567 | 5748 | break; |
11365043 | 5749 | case IORING_OP_TIMEOUT_REMOVE: |
3529d8c2 JA |
5750 | if (sqe) { |
5751 | ret = io_timeout_remove_prep(req, sqe); | |
5752 | if (ret) | |
5753 | break; | |
5754 | } | |
fc4df999 | 5755 | ret = io_timeout_remove(req); |
11365043 | 5756 | break; |
17f2fe35 | 5757 | case IORING_OP_ACCEPT: |
3529d8c2 JA |
5758 | if (sqe) { |
5759 | ret = io_accept_prep(req, sqe); | |
5760 | if (ret) | |
5761 | break; | |
5762 | } | |
229a7b63 | 5763 | ret = io_accept(req, force_nonblock, cs); |
17f2fe35 | 5764 | break; |
f8e85cf2 | 5765 | case IORING_OP_CONNECT: |
3529d8c2 JA |
5766 | if (sqe) { |
5767 | ret = io_connect_prep(req, sqe); | |
5768 | if (ret) | |
5769 | break; | |
5770 | } | |
229a7b63 | 5771 | ret = io_connect(req, force_nonblock, cs); |
f8e85cf2 | 5772 | break; |
62755e35 | 5773 | case IORING_OP_ASYNC_CANCEL: |
3529d8c2 JA |
5774 | if (sqe) { |
5775 | ret = io_async_cancel_prep(req, sqe); | |
5776 | if (ret) | |
5777 | break; | |
5778 | } | |
014db007 | 5779 | ret = io_async_cancel(req); |
62755e35 | 5780 | break; |
d63d1b5e JA |
5781 | case IORING_OP_FALLOCATE: |
5782 | if (sqe) { | |
5783 | ret = io_fallocate_prep(req, sqe); | |
5784 | if (ret) | |
5785 | break; | |
5786 | } | |
014db007 | 5787 | ret = io_fallocate(req, force_nonblock); |
d63d1b5e | 5788 | break; |
15b71abe JA |
5789 | case IORING_OP_OPENAT: |
5790 | if (sqe) { | |
5791 | ret = io_openat_prep(req, sqe); | |
5792 | if (ret) | |
5793 | break; | |
5794 | } | |
014db007 | 5795 | ret = io_openat(req, force_nonblock); |
15b71abe | 5796 | break; |
b5dba59e JA |
5797 | case IORING_OP_CLOSE: |
5798 | if (sqe) { | |
5799 | ret = io_close_prep(req, sqe); | |
5800 | if (ret) | |
5801 | break; | |
5802 | } | |
229a7b63 | 5803 | ret = io_close(req, force_nonblock, cs); |
b5dba59e | 5804 | break; |
05f3fb3c JA |
5805 | case IORING_OP_FILES_UPDATE: |
5806 | if (sqe) { | |
5807 | ret = io_files_update_prep(req, sqe); | |
5808 | if (ret) | |
5809 | break; | |
5810 | } | |
229a7b63 | 5811 | ret = io_files_update(req, force_nonblock, cs); |
05f3fb3c | 5812 | break; |
eddc7ef5 JA |
5813 | case IORING_OP_STATX: |
5814 | if (sqe) { | |
5815 | ret = io_statx_prep(req, sqe); | |
5816 | if (ret) | |
5817 | break; | |
5818 | } | |
014db007 | 5819 | ret = io_statx(req, force_nonblock); |
eddc7ef5 | 5820 | break; |
4840e418 JA |
5821 | case IORING_OP_FADVISE: |
5822 | if (sqe) { | |
5823 | ret = io_fadvise_prep(req, sqe); | |
5824 | if (ret) | |
5825 | break; | |
5826 | } | |
014db007 | 5827 | ret = io_fadvise(req, force_nonblock); |
4840e418 | 5828 | break; |
c1ca757b JA |
5829 | case IORING_OP_MADVISE: |
5830 | if (sqe) { | |
5831 | ret = io_madvise_prep(req, sqe); | |
5832 | if (ret) | |
5833 | break; | |
5834 | } | |
014db007 | 5835 | ret = io_madvise(req, force_nonblock); |
c1ca757b | 5836 | break; |
cebdb986 JA |
5837 | case IORING_OP_OPENAT2: |
5838 | if (sqe) { | |
5839 | ret = io_openat2_prep(req, sqe); | |
5840 | if (ret) | |
5841 | break; | |
5842 | } | |
014db007 | 5843 | ret = io_openat2(req, force_nonblock); |
cebdb986 | 5844 | break; |
3e4827b0 JA |
5845 | case IORING_OP_EPOLL_CTL: |
5846 | if (sqe) { | |
5847 | ret = io_epoll_ctl_prep(req, sqe); | |
5848 | if (ret) | |
5849 | break; | |
5850 | } | |
229a7b63 | 5851 | ret = io_epoll_ctl(req, force_nonblock, cs); |
3e4827b0 | 5852 | break; |
7d67af2c PB |
5853 | case IORING_OP_SPLICE: |
5854 | if (sqe) { | |
5855 | ret = io_splice_prep(req, sqe); | |
5856 | if (ret < 0) | |
5857 | break; | |
5858 | } | |
014db007 | 5859 | ret = io_splice(req, force_nonblock); |
7d67af2c | 5860 | break; |
ddf0322d JA |
5861 | case IORING_OP_PROVIDE_BUFFERS: |
5862 | if (sqe) { | |
5863 | ret = io_provide_buffers_prep(req, sqe); | |
5864 | if (ret) | |
5865 | break; | |
5866 | } | |
229a7b63 | 5867 | ret = io_provide_buffers(req, force_nonblock, cs); |
ddf0322d | 5868 | break; |
067524e9 JA |
5869 | case IORING_OP_REMOVE_BUFFERS: |
5870 | if (sqe) { | |
5871 | ret = io_remove_buffers_prep(req, sqe); | |
5872 | if (ret) | |
5873 | break; | |
5874 | } | |
229a7b63 | 5875 | ret = io_remove_buffers(req, force_nonblock, cs); |
3e4827b0 | 5876 | break; |
f2a8d5c7 PB |
5877 | case IORING_OP_TEE: |
5878 | if (sqe) { | |
5879 | ret = io_tee_prep(req, sqe); | |
5880 | if (ret < 0) | |
5881 | break; | |
5882 | } | |
5883 | ret = io_tee(req, force_nonblock); | |
5884 | break; | |
2b188cc1 JA |
5885 | default: |
5886 | ret = -EINVAL; | |
5887 | break; | |
5888 | } | |
5889 | ||
def596e9 JA |
5890 | if (ret) |
5891 | return ret; | |
5892 | ||
b532576e JA |
5893 | /* If the op doesn't have a file, we're not polling for it */ |
5894 | if ((ctx->flags & IORING_SETUP_IOPOLL) && req->file) { | |
11ba820b JA |
5895 | const bool in_async = io_wq_current_is_worker(); |
5896 | ||
11ba820b JA |
5897 | /* workqueue context doesn't hold uring_lock, grab it now */ |
5898 | if (in_async) | |
5899 | mutex_lock(&ctx->uring_lock); | |
5900 | ||
def596e9 | 5901 | io_iopoll_req_issued(req); |
11ba820b JA |
5902 | |
5903 | if (in_async) | |
5904 | mutex_unlock(&ctx->uring_lock); | |
def596e9 JA |
5905 | } |
5906 | ||
5907 | return 0; | |
2b188cc1 JA |
5908 | } |
5909 | ||
f4db7182 | 5910 | static struct io_wq_work *io_wq_submit_work(struct io_wq_work *work) |
2b188cc1 JA |
5911 | { |
5912 | struct io_kiocb *req = container_of(work, struct io_kiocb, work); | |
6df1db6b | 5913 | struct io_kiocb *timeout; |
561fb04a | 5914 | int ret = 0; |
2b188cc1 | 5915 | |
6df1db6b PB |
5916 | timeout = io_prep_linked_timeout(req); |
5917 | if (timeout) | |
5918 | io_queue_linked_timeout(timeout); | |
d4c81f38 | 5919 | |
0c9d5ccd JA |
5920 | /* if NO_CANCEL is set, we must still run the work */ |
5921 | if ((work->flags & (IO_WQ_WORK_CANCEL|IO_WQ_WORK_NO_CANCEL)) == | |
5922 | IO_WQ_WORK_CANCEL) { | |
561fb04a | 5923 | ret = -ECANCELED; |
0c9d5ccd | 5924 | } |
31b51510 | 5925 | |
561fb04a | 5926 | if (!ret) { |
561fb04a | 5927 | do { |
f13fad7b | 5928 | ret = io_issue_sqe(req, NULL, false, NULL); |
561fb04a JA |
5929 | /* |
5930 | * We can get EAGAIN for polled IO even though we're | |
5931 | * forcing a sync submission from here, since we can't | |
5932 | * wait for request slots on the block side. | |
5933 | */ | |
5934 | if (ret != -EAGAIN) | |
5935 | break; | |
5936 | cond_resched(); | |
5937 | } while (1); | |
5938 | } | |
31b51510 | 5939 | |
561fb04a | 5940 | if (ret) { |
4e88d6e7 | 5941 | req_set_fail_links(req); |
e1e16097 | 5942 | io_req_complete(req, ret); |
edafccee | 5943 | } |
2b188cc1 | 5944 | |
f4db7182 | 5945 | return io_steal_work(req); |
2b188cc1 JA |
5946 | } |
5947 | ||
65e19f54 JA |
5948 | static inline struct file *io_file_from_index(struct io_ring_ctx *ctx, |
5949 | int index) | |
5950 | { | |
5951 | struct fixed_file_table *table; | |
5952 | ||
05f3fb3c | 5953 | table = &ctx->file_data->table[index >> IORING_FILE_TABLE_SHIFT]; |
84695089 | 5954 | return table->files[index & IORING_FILE_TABLE_MASK]; |
65e19f54 JA |
5955 | } |
5956 | ||
8da11c19 PB |
5957 | static int io_file_get(struct io_submit_state *state, struct io_kiocb *req, |
5958 | int fd, struct file **out_file, bool fixed) | |
09bb8394 | 5959 | { |
a197f664 | 5960 | struct io_ring_ctx *ctx = req->ctx; |
8da11c19 | 5961 | struct file *file; |
09bb8394 | 5962 | |
8da11c19 | 5963 | if (fixed) { |
05f3fb3c | 5964 | if (unlikely(!ctx->file_data || |
09bb8394 JA |
5965 | (unsigned) fd >= ctx->nr_user_files)) |
5966 | return -EBADF; | |
b7620121 | 5967 | fd = array_index_nospec(fd, ctx->nr_user_files); |
8da11c19 | 5968 | file = io_file_from_index(ctx, fd); |
fd2206e4 JA |
5969 | if (file) { |
5970 | req->fixed_file_refs = ctx->file_data->cur_refs; | |
5971 | percpu_ref_get(req->fixed_file_refs); | |
5972 | } | |
09bb8394 | 5973 | } else { |
c826bd7a | 5974 | trace_io_uring_file_get(ctx, fd); |
8da11c19 | 5975 | file = __io_file_get(state, fd); |
09bb8394 JA |
5976 | } |
5977 | ||
fd2206e4 JA |
5978 | if (file || io_op_defs[req->opcode].needs_file_no_error) { |
5979 | *out_file = file; | |
5980 | return 0; | |
5981 | } | |
5982 | return -EBADF; | |
09bb8394 JA |
5983 | } |
5984 | ||
8da11c19 | 5985 | static int io_req_set_file(struct io_submit_state *state, struct io_kiocb *req, |
63ff8223 | 5986 | int fd) |
8da11c19 | 5987 | { |
8da11c19 PB |
5988 | bool fixed; |
5989 | ||
63ff8223 | 5990 | fixed = (req->flags & REQ_F_FIXED_FILE) != 0; |
0cdaf760 | 5991 | if (unlikely(!fixed && io_async_submit(req->ctx))) |
8da11c19 PB |
5992 | return -EBADF; |
5993 | ||
5994 | return io_file_get(state, req, fd, &req->file, fixed); | |
5995 | } | |
5996 | ||
a197f664 | 5997 | static int io_grab_files(struct io_kiocb *req) |
fcb323cc JA |
5998 | { |
5999 | int ret = -EBADF; | |
a197f664 | 6000 | struct io_ring_ctx *ctx = req->ctx; |
fcb323cc | 6001 | |
f56040b8 PB |
6002 | io_req_init_async(req); |
6003 | ||
5b0bbee4 | 6004 | if (req->work.files || (req->flags & REQ_F_NO_FILE_TABLE)) |
f86cd20c | 6005 | return 0; |
b14cca0c | 6006 | if (!ctx->ring_file) |
b5dba59e JA |
6007 | return -EBADF; |
6008 | ||
fcb323cc JA |
6009 | rcu_read_lock(); |
6010 | spin_lock_irq(&ctx->inflight_lock); | |
6011 | /* | |
6012 | * We use the f_ops->flush() handler to ensure that we can flush | |
6013 | * out work accessing these files if the fd is closed. Check if | |
6014 | * the fd has changed since we started down this path, and disallow | |
6015 | * this operation if it has. | |
6016 | */ | |
b14cca0c | 6017 | if (fcheck(ctx->ring_fd) == ctx->ring_file) { |
fcb323cc JA |
6018 | list_add(&req->inflight_entry, &ctx->inflight_list); |
6019 | req->flags |= REQ_F_INFLIGHT; | |
6020 | req->work.files = current->files; | |
6021 | ret = 0; | |
6022 | } | |
6023 | spin_unlock_irq(&ctx->inflight_lock); | |
6024 | rcu_read_unlock(); | |
6025 | ||
6026 | return ret; | |
6027 | } | |
6028 | ||
f56040b8 PB |
6029 | static inline int io_prep_work_files(struct io_kiocb *req) |
6030 | { | |
6031 | if (!io_op_defs[req->opcode].file_table) | |
6032 | return 0; | |
6033 | return io_grab_files(req); | |
6034 | } | |
6035 | ||
2665abfd | 6036 | static enum hrtimer_restart io_link_timeout_fn(struct hrtimer *timer) |
2b188cc1 | 6037 | { |
ad8a48ac JA |
6038 | struct io_timeout_data *data = container_of(timer, |
6039 | struct io_timeout_data, timer); | |
6040 | struct io_kiocb *req = data->req; | |
2665abfd JA |
6041 | struct io_ring_ctx *ctx = req->ctx; |
6042 | struct io_kiocb *prev = NULL; | |
6043 | unsigned long flags; | |
2665abfd JA |
6044 | |
6045 | spin_lock_irqsave(&ctx->completion_lock, flags); | |
6046 | ||
6047 | /* | |
6048 | * We don't expect the list to be empty, that will only happen if we | |
6049 | * race with the completion of the linked work. | |
6050 | */ | |
4493233e PB |
6051 | if (!list_empty(&req->link_list)) { |
6052 | prev = list_entry(req->link_list.prev, struct io_kiocb, | |
6053 | link_list); | |
5d960724 | 6054 | if (refcount_inc_not_zero(&prev->refs)) { |
4493233e | 6055 | list_del_init(&req->link_list); |
5d960724 JA |
6056 | prev->flags &= ~REQ_F_LINK_TIMEOUT; |
6057 | } else | |
76a46e06 | 6058 | prev = NULL; |
2665abfd JA |
6059 | } |
6060 | ||
6061 | spin_unlock_irqrestore(&ctx->completion_lock, flags); | |
6062 | ||
6063 | if (prev) { | |
4e88d6e7 | 6064 | req_set_fail_links(prev); |
014db007 | 6065 | io_async_find_and_cancel(ctx, req, prev->user_data, -ETIME); |
76a46e06 | 6066 | io_put_req(prev); |
47f46768 | 6067 | } else { |
e1e16097 | 6068 | io_req_complete(req, -ETIME); |
2665abfd | 6069 | } |
2665abfd JA |
6070 | return HRTIMER_NORESTART; |
6071 | } | |
6072 | ||
7271ef3a | 6073 | static void __io_queue_linked_timeout(struct io_kiocb *req) |
2665abfd | 6074 | { |
76a46e06 JA |
6075 | /* |
6076 | * If the list is now empty, then our linked request finished before | |
6077 | * we got a chance to setup the timer | |
6078 | */ | |
4493233e | 6079 | if (!list_empty(&req->link_list)) { |
2d28390a | 6080 | struct io_timeout_data *data = &req->io->timeout; |
94ae5e77 | 6081 | |
ad8a48ac JA |
6082 | data->timer.function = io_link_timeout_fn; |
6083 | hrtimer_start(&data->timer, timespec64_to_ktime(data->ts), | |
6084 | data->mode); | |
2665abfd | 6085 | } |
7271ef3a JA |
6086 | } |
6087 | ||
6088 | static void io_queue_linked_timeout(struct io_kiocb *req) | |
6089 | { | |
6090 | struct io_ring_ctx *ctx = req->ctx; | |
6091 | ||
6092 | spin_lock_irq(&ctx->completion_lock); | |
6093 | __io_queue_linked_timeout(req); | |
76a46e06 | 6094 | spin_unlock_irq(&ctx->completion_lock); |
2665abfd | 6095 | |
2665abfd | 6096 | /* drop submission reference */ |
76a46e06 JA |
6097 | io_put_req(req); |
6098 | } | |
2665abfd | 6099 | |
ad8a48ac | 6100 | static struct io_kiocb *io_prep_linked_timeout(struct io_kiocb *req) |
2665abfd JA |
6101 | { |
6102 | struct io_kiocb *nxt; | |
6103 | ||
dea3b49c | 6104 | if (!(req->flags & REQ_F_LINK_HEAD)) |
2665abfd | 6105 | return NULL; |
6df1db6b | 6106 | if (req->flags & REQ_F_LINK_TIMEOUT) |
d7718a9d | 6107 | return NULL; |
2665abfd | 6108 | |
4493233e PB |
6109 | nxt = list_first_entry_or_null(&req->link_list, struct io_kiocb, |
6110 | link_list); | |
d625c6ee | 6111 | if (!nxt || nxt->opcode != IORING_OP_LINK_TIMEOUT) |
76a46e06 | 6112 | return NULL; |
2665abfd | 6113 | |
76a46e06 | 6114 | req->flags |= REQ_F_LINK_TIMEOUT; |
76a46e06 | 6115 | return nxt; |
2665abfd JA |
6116 | } |
6117 | ||
f13fad7b JA |
6118 | static void __io_queue_sqe(struct io_kiocb *req, const struct io_uring_sqe *sqe, |
6119 | struct io_comp_state *cs) | |
2b188cc1 | 6120 | { |
4a0a7a18 | 6121 | struct io_kiocb *linked_timeout; |
4bc4494e | 6122 | struct io_kiocb *nxt; |
193155c8 | 6123 | const struct cred *old_creds = NULL; |
e0c5c576 | 6124 | int ret; |
2b188cc1 | 6125 | |
4a0a7a18 JA |
6126 | again: |
6127 | linked_timeout = io_prep_linked_timeout(req); | |
6128 | ||
7cdaf587 XW |
6129 | if ((req->flags & REQ_F_WORK_INITIALIZED) && req->work.creds && |
6130 | req->work.creds != current_cred()) { | |
193155c8 JA |
6131 | if (old_creds) |
6132 | revert_creds(old_creds); | |
6133 | if (old_creds == req->work.creds) | |
6134 | old_creds = NULL; /* restored original creds */ | |
6135 | else | |
6136 | old_creds = override_creds(req->work.creds); | |
6137 | } | |
6138 | ||
f13fad7b | 6139 | ret = io_issue_sqe(req, sqe, true, cs); |
491381ce JA |
6140 | |
6141 | /* | |
6142 | * We async punt it if the file wasn't marked NOWAIT, or if the file | |
6143 | * doesn't support non-blocking read/write attempts | |
6144 | */ | |
24c74678 | 6145 | if (ret == -EAGAIN && !(req->flags & REQ_F_NOWAIT)) { |
f063c547 | 6146 | if (!io_arm_poll_handler(req)) { |
86a761f8 | 6147 | punt: |
f063c547 PB |
6148 | ret = io_prep_work_files(req); |
6149 | if (unlikely(ret)) | |
bbad27b2 | 6150 | goto err; |
f063c547 PB |
6151 | /* |
6152 | * Queued up for async execution, worker will release | |
6153 | * submit reference when the iocb is actually submitted. | |
6154 | */ | |
6155 | io_queue_async_work(req); | |
2b188cc1 | 6156 | } |
bbad27b2 | 6157 | |
f063c547 PB |
6158 | if (linked_timeout) |
6159 | io_queue_linked_timeout(linked_timeout); | |
4bc4494e | 6160 | goto exit; |
2b188cc1 | 6161 | } |
e65ef56d | 6162 | |
652532ad | 6163 | if (unlikely(ret)) { |
fcb323cc | 6164 | err: |
652532ad PB |
6165 | /* un-prep timeout, so it'll be killed as any other linked */ |
6166 | req->flags &= ~REQ_F_LINK_TIMEOUT; | |
4e88d6e7 | 6167 | req_set_fail_links(req); |
e65ef56d | 6168 | io_put_req(req); |
e1e16097 | 6169 | io_req_complete(req, ret); |
652532ad | 6170 | goto exit; |
9e645e11 | 6171 | } |
652532ad PB |
6172 | |
6173 | /* drop submission reference */ | |
6174 | nxt = io_put_req_find_next(req); | |
6175 | if (linked_timeout) | |
6176 | io_queue_linked_timeout(linked_timeout); | |
6177 | ||
4a0a7a18 JA |
6178 | if (nxt) { |
6179 | req = nxt; | |
86a761f8 PB |
6180 | |
6181 | if (req->flags & REQ_F_FORCE_ASYNC) | |
6182 | goto punt; | |
4a0a7a18 JA |
6183 | goto again; |
6184 | } | |
4bc4494e | 6185 | exit: |
193155c8 JA |
6186 | if (old_creds) |
6187 | revert_creds(old_creds); | |
2b188cc1 JA |
6188 | } |
6189 | ||
f13fad7b JA |
6190 | static void io_queue_sqe(struct io_kiocb *req, const struct io_uring_sqe *sqe, |
6191 | struct io_comp_state *cs) | |
4fe2c963 JL |
6192 | { |
6193 | int ret; | |
6194 | ||
3529d8c2 | 6195 | ret = io_req_defer(req, sqe); |
4fe2c963 JL |
6196 | if (ret) { |
6197 | if (ret != -EIOCBQUEUED) { | |
1118591a | 6198 | fail_req: |
4e88d6e7 | 6199 | req_set_fail_links(req); |
e1e16097 JA |
6200 | io_put_req(req); |
6201 | io_req_complete(req, ret); | |
4fe2c963 | 6202 | } |
2550878f | 6203 | } else if (req->flags & REQ_F_FORCE_ASYNC) { |
bd2ab18a | 6204 | if (!req->io) { |
bd2ab18a | 6205 | ret = io_req_defer_prep(req, sqe); |
327d6d96 | 6206 | if (unlikely(ret)) |
bd2ab18a PB |
6207 | goto fail_req; |
6208 | } | |
6209 | ||
ce35a47a JA |
6210 | /* |
6211 | * Never try inline submit of IOSQE_ASYNC is set, go straight | |
6212 | * to async execution. | |
6213 | */ | |
3e863ea3 | 6214 | io_req_init_async(req); |
ce35a47a JA |
6215 | req->work.flags |= IO_WQ_WORK_CONCURRENT; |
6216 | io_queue_async_work(req); | |
6217 | } else { | |
f13fad7b | 6218 | __io_queue_sqe(req, sqe, cs); |
ce35a47a | 6219 | } |
4fe2c963 JL |
6220 | } |
6221 | ||
f13fad7b JA |
6222 | static inline void io_queue_link_head(struct io_kiocb *req, |
6223 | struct io_comp_state *cs) | |
4fe2c963 | 6224 | { |
94ae5e77 | 6225 | if (unlikely(req->flags & REQ_F_FAIL_LINK)) { |
e1e16097 JA |
6226 | io_put_req(req); |
6227 | io_req_complete(req, -ECANCELED); | |
1b4a51b6 | 6228 | } else |
f13fad7b | 6229 | io_queue_sqe(req, NULL, cs); |
4fe2c963 JL |
6230 | } |
6231 | ||
1d4240cc | 6232 | static int io_submit_sqe(struct io_kiocb *req, const struct io_uring_sqe *sqe, |
f13fad7b | 6233 | struct io_kiocb **link, struct io_comp_state *cs) |
9e645e11 | 6234 | { |
a197f664 | 6235 | struct io_ring_ctx *ctx = req->ctx; |
ef4ff581 | 6236 | int ret; |
9e645e11 | 6237 | |
9e645e11 JA |
6238 | /* |
6239 | * If we already have a head request, queue this one for async | |
6240 | * submittal once the head completes. If we don't have a head but | |
6241 | * IOSQE_IO_LINK is set in the sqe, start a new head. This one will be | |
6242 | * submitted sync once the chain is complete. If none of those | |
6243 | * conditions are true (normal request), then just queue it. | |
6244 | */ | |
6245 | if (*link) { | |
9d76377f | 6246 | struct io_kiocb *head = *link; |
4e88d6e7 | 6247 | |
8cdf2193 PB |
6248 | /* |
6249 | * Taking sequential execution of a link, draining both sides | |
6250 | * of the link also fullfils IOSQE_IO_DRAIN semantics for all | |
6251 | * requests in the link. So, it drains the head and the | |
6252 | * next after the link request. The last one is done via | |
6253 | * drain_next flag to persist the effect across calls. | |
6254 | */ | |
ef4ff581 | 6255 | if (req->flags & REQ_F_IO_DRAIN) { |
711be031 PB |
6256 | head->flags |= REQ_F_IO_DRAIN; |
6257 | ctx->drain_next = 1; | |
6258 | } | |
3529d8c2 | 6259 | ret = io_req_defer_prep(req, sqe); |
327d6d96 | 6260 | if (unlikely(ret)) { |
4e88d6e7 | 6261 | /* fail even hard links since we don't submit */ |
9d76377f | 6262 | head->flags |= REQ_F_FAIL_LINK; |
1d4240cc | 6263 | return ret; |
2d28390a | 6264 | } |
9d76377f | 6265 | trace_io_uring_link(ctx, req, head); |
c40f6379 | 6266 | io_get_req_task(req); |
9d76377f | 6267 | list_add_tail(&req->link_list, &head->link_list); |
32fe525b PB |
6268 | |
6269 | /* last request of a link, enqueue the link */ | |
ef4ff581 | 6270 | if (!(req->flags & (REQ_F_LINK | REQ_F_HARDLINK))) { |
f13fad7b | 6271 | io_queue_link_head(head, cs); |
32fe525b PB |
6272 | *link = NULL; |
6273 | } | |
9e645e11 | 6274 | } else { |
711be031 PB |
6275 | if (unlikely(ctx->drain_next)) { |
6276 | req->flags |= REQ_F_IO_DRAIN; | |
ef4ff581 | 6277 | ctx->drain_next = 0; |
711be031 | 6278 | } |
ef4ff581 | 6279 | if (req->flags & (REQ_F_LINK | REQ_F_HARDLINK)) { |
dea3b49c | 6280 | req->flags |= REQ_F_LINK_HEAD; |
711be031 | 6281 | INIT_LIST_HEAD(&req->link_list); |
f1d96a8f | 6282 | |
711be031 | 6283 | ret = io_req_defer_prep(req, sqe); |
327d6d96 | 6284 | if (unlikely(ret)) |
711be031 PB |
6285 | req->flags |= REQ_F_FAIL_LINK; |
6286 | *link = req; | |
6287 | } else { | |
f13fad7b | 6288 | io_queue_sqe(req, sqe, cs); |
711be031 | 6289 | } |
9e645e11 | 6290 | } |
2e6e1fde | 6291 | |
1d4240cc | 6292 | return 0; |
9e645e11 JA |
6293 | } |
6294 | ||
9a56a232 JA |
6295 | /* |
6296 | * Batched submission is done, ensure local IO is flushed out. | |
6297 | */ | |
6298 | static void io_submit_state_end(struct io_submit_state *state) | |
6299 | { | |
f13fad7b JA |
6300 | if (!list_empty(&state->comp.list)) |
6301 | io_submit_flush_completions(&state->comp); | |
9a56a232 | 6302 | blk_finish_plug(&state->plug); |
9f13c35b | 6303 | io_state_file_put(state); |
2579f913 | 6304 | if (state->free_reqs) |
6c8a3134 | 6305 | kmem_cache_free_bulk(req_cachep, state->free_reqs, state->reqs); |
9a56a232 JA |
6306 | } |
6307 | ||
6308 | /* | |
6309 | * Start submission side cache. | |
6310 | */ | |
6311 | static void io_submit_state_start(struct io_submit_state *state, | |
013538bd | 6312 | struct io_ring_ctx *ctx, unsigned int max_ios) |
9a56a232 JA |
6313 | { |
6314 | blk_start_plug(&state->plug); | |
b63534c4 JA |
6315 | #ifdef CONFIG_BLOCK |
6316 | state->plug.nowait = true; | |
6317 | #endif | |
013538bd JA |
6318 | state->comp.nr = 0; |
6319 | INIT_LIST_HEAD(&state->comp.list); | |
6320 | state->comp.ctx = ctx; | |
2579f913 | 6321 | state->free_reqs = 0; |
9a56a232 JA |
6322 | state->file = NULL; |
6323 | state->ios_left = max_ios; | |
6324 | } | |
6325 | ||
2b188cc1 JA |
6326 | static void io_commit_sqring(struct io_ring_ctx *ctx) |
6327 | { | |
75b28aff | 6328 | struct io_rings *rings = ctx->rings; |
2b188cc1 | 6329 | |
caf582c6 PB |
6330 | /* |
6331 | * Ensure any loads from the SQEs are done at this point, | |
6332 | * since once we write the new head, the application could | |
6333 | * write new data to them. | |
6334 | */ | |
6335 | smp_store_release(&rings->sq.head, ctx->cached_sq_head); | |
2b188cc1 JA |
6336 | } |
6337 | ||
2b188cc1 | 6338 | /* |
3529d8c2 | 6339 | * Fetch an sqe, if one is available. Note that sqe_ptr will point to memory |
2b188cc1 JA |
6340 | * that is mapped by userspace. This means that care needs to be taken to |
6341 | * ensure that reads are stable, as we cannot rely on userspace always | |
6342 | * being a good citizen. If members of the sqe are validated and then later | |
6343 | * used, it's important that those reads are done through READ_ONCE() to | |
6344 | * prevent a re-load down the line. | |
6345 | */ | |
709b302f | 6346 | static const struct io_uring_sqe *io_get_sqe(struct io_ring_ctx *ctx) |
2b188cc1 | 6347 | { |
75b28aff | 6348 | u32 *sq_array = ctx->sq_array; |
2b188cc1 JA |
6349 | unsigned head; |
6350 | ||
6351 | /* | |
6352 | * The cached sq head (or cq tail) serves two purposes: | |
6353 | * | |
6354 | * 1) allows us to batch the cost of updating the user visible | |
6355 | * head updates. | |
6356 | * 2) allows the kernel side to track the head on its own, even | |
6357 | * though the application is the one updating it. | |
6358 | */ | |
ee7d46d9 | 6359 | head = READ_ONCE(sq_array[ctx->cached_sq_head & ctx->sq_mask]); |
709b302f PB |
6360 | if (likely(head < ctx->sq_entries)) |
6361 | return &ctx->sq_sqes[head]; | |
2b188cc1 JA |
6362 | |
6363 | /* drop invalid entries */ | |
498ccd9e | 6364 | ctx->cached_sq_dropped++; |
ee7d46d9 | 6365 | WRITE_ONCE(ctx->rings->sq_dropped, ctx->cached_sq_dropped); |
709b302f PB |
6366 | return NULL; |
6367 | } | |
6368 | ||
6369 | static inline void io_consume_sqe(struct io_ring_ctx *ctx) | |
6370 | { | |
6371 | ctx->cached_sq_head++; | |
2b188cc1 JA |
6372 | } |
6373 | ||
ef4ff581 PB |
6374 | #define SQE_VALID_FLAGS (IOSQE_FIXED_FILE|IOSQE_IO_DRAIN|IOSQE_IO_LINK| \ |
6375 | IOSQE_IO_HARDLINK | IOSQE_ASYNC | \ | |
6376 | IOSQE_BUFFER_SELECT) | |
6377 | ||
6378 | static int io_init_req(struct io_ring_ctx *ctx, struct io_kiocb *req, | |
6379 | const struct io_uring_sqe *sqe, | |
0cdaf760 | 6380 | struct io_submit_state *state) |
0553b8bd | 6381 | { |
ef4ff581 | 6382 | unsigned int sqe_flags; |
63ff8223 | 6383 | int id; |
ef4ff581 | 6384 | |
0553b8bd PB |
6385 | req->opcode = READ_ONCE(sqe->opcode); |
6386 | req->user_data = READ_ONCE(sqe->user_data); | |
6387 | req->io = NULL; | |
6388 | req->file = NULL; | |
6389 | req->ctx = ctx; | |
6390 | req->flags = 0; | |
6391 | /* one is dropped after submission, the other at completion */ | |
6392 | refcount_set(&req->refs, 2); | |
4dd2824d | 6393 | req->task = current; |
0553b8bd | 6394 | req->result = 0; |
ef4ff581 PB |
6395 | |
6396 | if (unlikely(req->opcode >= IORING_OP_LAST)) | |
6397 | return -EINVAL; | |
6398 | ||
9d8426a0 JA |
6399 | if (unlikely(io_sq_thread_acquire_mm(ctx, req))) |
6400 | return -EFAULT; | |
ef4ff581 PB |
6401 | |
6402 | sqe_flags = READ_ONCE(sqe->flags); | |
6403 | /* enforce forwards compatibility on users */ | |
6404 | if (unlikely(sqe_flags & ~SQE_VALID_FLAGS)) | |
6405 | return -EINVAL; | |
6406 | ||
6407 | if ((sqe_flags & IOSQE_BUFFER_SELECT) && | |
6408 | !io_op_defs[req->opcode].buffer_select) | |
6409 | return -EOPNOTSUPP; | |
6410 | ||
6411 | id = READ_ONCE(sqe->personality); | |
6412 | if (id) { | |
7cdaf587 | 6413 | io_req_init_async(req); |
ef4ff581 PB |
6414 | req->work.creds = idr_find(&ctx->personality_idr, id); |
6415 | if (unlikely(!req->work.creds)) | |
6416 | return -EINVAL; | |
6417 | get_cred(req->work.creds); | |
6418 | } | |
6419 | ||
6420 | /* same numerical values with corresponding REQ_F_*, safe to copy */ | |
c11368a5 | 6421 | req->flags |= sqe_flags; |
ef4ff581 | 6422 | |
63ff8223 JA |
6423 | if (!io_op_defs[req->opcode].needs_file) |
6424 | return 0; | |
6425 | ||
6426 | return io_req_set_file(state, req, READ_ONCE(sqe->fd)); | |
0553b8bd PB |
6427 | } |
6428 | ||
fb5ccc98 | 6429 | static int io_submit_sqes(struct io_ring_ctx *ctx, unsigned int nr, |
0cdaf760 | 6430 | struct file *ring_file, int ring_fd) |
6c271ce2 | 6431 | { |
ac8691c4 | 6432 | struct io_submit_state state; |
9e645e11 | 6433 | struct io_kiocb *link = NULL; |
9e645e11 | 6434 | int i, submitted = 0; |
6c271ce2 | 6435 | |
c4a2ed72 | 6436 | /* if we have a backlog and couldn't flush it all, return BUSY */ |
ad3eb2c8 JA |
6437 | if (test_bit(0, &ctx->sq_check_overflow)) { |
6438 | if (!list_empty(&ctx->cq_overflow_list) && | |
6439 | !io_cqring_overflow_flush(ctx, false)) | |
6440 | return -EBUSY; | |
6441 | } | |
6c271ce2 | 6442 | |
ee7d46d9 PB |
6443 | /* make sure SQ entry isn't read before tail */ |
6444 | nr = min3(nr, ctx->sq_entries, io_sqring_entries(ctx)); | |
9ef4f124 | 6445 | |
2b85edfc PB |
6446 | if (!percpu_ref_tryget_many(&ctx->refs, nr)) |
6447 | return -EAGAIN; | |
6c271ce2 | 6448 | |
013538bd | 6449 | io_submit_state_start(&state, ctx, nr); |
6c271ce2 | 6450 | |
b14cca0c PB |
6451 | ctx->ring_fd = ring_fd; |
6452 | ctx->ring_file = ring_file; | |
6453 | ||
6c271ce2 | 6454 | for (i = 0; i < nr; i++) { |
3529d8c2 | 6455 | const struct io_uring_sqe *sqe; |
196be95c | 6456 | struct io_kiocb *req; |
1cb1edb2 | 6457 | int err; |
fb5ccc98 | 6458 | |
b1e50e54 PB |
6459 | sqe = io_get_sqe(ctx); |
6460 | if (unlikely(!sqe)) { | |
6461 | io_consume_sqe(ctx); | |
6462 | break; | |
6463 | } | |
ac8691c4 | 6464 | req = io_alloc_req(ctx, &state); |
196be95c PB |
6465 | if (unlikely(!req)) { |
6466 | if (!submitted) | |
6467 | submitted = -EAGAIN; | |
fb5ccc98 | 6468 | break; |
196be95c | 6469 | } |
fb5ccc98 | 6470 | |
ac8691c4 | 6471 | err = io_init_req(ctx, req, sqe, &state); |
709b302f | 6472 | io_consume_sqe(ctx); |
d3656344 JA |
6473 | /* will complete beyond this point, count as submitted */ |
6474 | submitted++; | |
6475 | ||
ef4ff581 | 6476 | if (unlikely(err)) { |
1cb1edb2 | 6477 | fail_req: |
e1e16097 JA |
6478 | io_put_req(req); |
6479 | io_req_complete(req, err); | |
196be95c PB |
6480 | break; |
6481 | } | |
fb5ccc98 | 6482 | |
354420f7 | 6483 | trace_io_uring_submit_sqe(ctx, req->opcode, req->user_data, |
0cdaf760 | 6484 | true, io_async_submit(ctx)); |
f13fad7b | 6485 | err = io_submit_sqe(req, sqe, &link, &state.comp); |
1d4240cc PB |
6486 | if (err) |
6487 | goto fail_req; | |
6c271ce2 JA |
6488 | } |
6489 | ||
9466f437 PB |
6490 | if (unlikely(submitted != nr)) { |
6491 | int ref_used = (submitted == -EAGAIN) ? 0 : submitted; | |
6492 | ||
6493 | percpu_ref_put_many(&ctx->refs, nr - ref_used); | |
6494 | } | |
9e645e11 | 6495 | if (link) |
f13fad7b | 6496 | io_queue_link_head(link, &state.comp); |
ac8691c4 | 6497 | io_submit_state_end(&state); |
6c271ce2 | 6498 | |
ae9428ca PB |
6499 | /* Commit SQ ring head once we've consumed and submitted all SQEs */ |
6500 | io_commit_sqring(ctx); | |
6501 | ||
6c271ce2 JA |
6502 | return submitted; |
6503 | } | |
6504 | ||
23b3628e XW |
6505 | static inline void io_ring_set_wakeup_flag(struct io_ring_ctx *ctx) |
6506 | { | |
6507 | /* Tell userspace we may need a wakeup call */ | |
6508 | spin_lock_irq(&ctx->completion_lock); | |
6509 | ctx->rings->sq_flags |= IORING_SQ_NEED_WAKEUP; | |
6510 | spin_unlock_irq(&ctx->completion_lock); | |
6511 | } | |
6512 | ||
6513 | static inline void io_ring_clear_wakeup_flag(struct io_ring_ctx *ctx) | |
6514 | { | |
6515 | spin_lock_irq(&ctx->completion_lock); | |
6516 | ctx->rings->sq_flags &= ~IORING_SQ_NEED_WAKEUP; | |
6517 | spin_unlock_irq(&ctx->completion_lock); | |
6518 | } | |
6519 | ||
6c271ce2 JA |
6520 | static int io_sq_thread(void *data) |
6521 | { | |
6c271ce2 | 6522 | struct io_ring_ctx *ctx = data; |
181e448d | 6523 | const struct cred *old_cred; |
6c271ce2 | 6524 | DEFINE_WAIT(wait); |
6c271ce2 | 6525 | unsigned long timeout; |
bdcd3eab | 6526 | int ret = 0; |
6c271ce2 | 6527 | |
0f158b4c | 6528 | complete(&ctx->sq_thread_comp); |
a4c0b3de | 6529 | |
181e448d | 6530 | old_cred = override_creds(ctx->creds); |
6c271ce2 | 6531 | |
bdcd3eab | 6532 | timeout = jiffies + ctx->sq_thread_idle; |
2bbcd6d3 | 6533 | while (!kthread_should_park()) { |
fb5ccc98 | 6534 | unsigned int to_submit; |
6c271ce2 | 6535 | |
540e32a0 | 6536 | if (!list_empty(&ctx->iopoll_list)) { |
6c271ce2 JA |
6537 | unsigned nr_events = 0; |
6538 | ||
bdcd3eab | 6539 | mutex_lock(&ctx->uring_lock); |
540e32a0 | 6540 | if (!list_empty(&ctx->iopoll_list) && !need_resched()) |
9dedd563 | 6541 | io_do_iopoll(ctx, &nr_events, 0); |
bdcd3eab | 6542 | else |
6c271ce2 | 6543 | timeout = jiffies + ctx->sq_thread_idle; |
bdcd3eab | 6544 | mutex_unlock(&ctx->uring_lock); |
6c271ce2 JA |
6545 | } |
6546 | ||
fb5ccc98 | 6547 | to_submit = io_sqring_entries(ctx); |
c1edbf5f JA |
6548 | |
6549 | /* | |
6550 | * If submit got -EBUSY, flag us as needing the application | |
6551 | * to enter the kernel to reap and flush events. | |
6552 | */ | |
b772f07a | 6553 | if (!to_submit || ret == -EBUSY || need_resched()) { |
7143b5ac SG |
6554 | /* |
6555 | * Drop cur_mm before scheduling, we can't hold it for | |
6556 | * long periods (or over schedule()). Do this before | |
6557 | * adding ourselves to the waitqueue, as the unuse/drop | |
6558 | * may sleep. | |
6559 | */ | |
4349f30e | 6560 | io_sq_thread_drop_mm(); |
7143b5ac | 6561 | |
6c271ce2 JA |
6562 | /* |
6563 | * We're polling. If we're within the defined idle | |
6564 | * period, then let us spin without work before going | |
c1edbf5f JA |
6565 | * to sleep. The exception is if we got EBUSY doing |
6566 | * more IO, we should wait for the application to | |
6567 | * reap events and wake us up. | |
6c271ce2 | 6568 | */ |
540e32a0 | 6569 | if (!list_empty(&ctx->iopoll_list) || need_resched() || |
df069d80 JA |
6570 | (!time_after(jiffies, timeout) && ret != -EBUSY && |
6571 | !percpu_ref_is_dying(&ctx->refs))) { | |
4c6e277c | 6572 | io_run_task_work(); |
9831a90c | 6573 | cond_resched(); |
6c271ce2 JA |
6574 | continue; |
6575 | } | |
6576 | ||
6c271ce2 JA |
6577 | prepare_to_wait(&ctx->sqo_wait, &wait, |
6578 | TASK_INTERRUPTIBLE); | |
6579 | ||
bdcd3eab XW |
6580 | /* |
6581 | * While doing polled IO, before going to sleep, we need | |
540e32a0 PB |
6582 | * to check if there are new reqs added to iopoll_list, |
6583 | * it is because reqs may have been punted to io worker | |
6584 | * and will be added to iopoll_list later, hence check | |
6585 | * the iopoll_list again. | |
bdcd3eab XW |
6586 | */ |
6587 | if ((ctx->flags & IORING_SETUP_IOPOLL) && | |
540e32a0 | 6588 | !list_empty_careful(&ctx->iopoll_list)) { |
bdcd3eab XW |
6589 | finish_wait(&ctx->sqo_wait, &wait); |
6590 | continue; | |
6591 | } | |
6592 | ||
23b3628e | 6593 | io_ring_set_wakeup_flag(ctx); |
6c271ce2 | 6594 | |
fb5ccc98 | 6595 | to_submit = io_sqring_entries(ctx); |
c1edbf5f | 6596 | if (!to_submit || ret == -EBUSY) { |
2bbcd6d3 | 6597 | if (kthread_should_park()) { |
6c271ce2 JA |
6598 | finish_wait(&ctx->sqo_wait, &wait); |
6599 | break; | |
6600 | } | |
4c6e277c | 6601 | if (io_run_task_work()) { |
10bea96d | 6602 | finish_wait(&ctx->sqo_wait, &wait); |
23b3628e | 6603 | io_ring_clear_wakeup_flag(ctx); |
b41e9852 JA |
6604 | continue; |
6605 | } | |
6c271ce2 JA |
6606 | if (signal_pending(current)) |
6607 | flush_signals(current); | |
6608 | schedule(); | |
6609 | finish_wait(&ctx->sqo_wait, &wait); | |
6610 | ||
23b3628e | 6611 | io_ring_clear_wakeup_flag(ctx); |
d4ae271d | 6612 | ret = 0; |
6c271ce2 JA |
6613 | continue; |
6614 | } | |
6615 | finish_wait(&ctx->sqo_wait, &wait); | |
6616 | ||
23b3628e | 6617 | io_ring_clear_wakeup_flag(ctx); |
6c271ce2 JA |
6618 | } |
6619 | ||
8a4955ff | 6620 | mutex_lock(&ctx->uring_lock); |
6b668c9b XW |
6621 | if (likely(!percpu_ref_is_dying(&ctx->refs))) |
6622 | ret = io_submit_sqes(ctx, to_submit, NULL, -1); | |
8a4955ff | 6623 | mutex_unlock(&ctx->uring_lock); |
bdcd3eab | 6624 | timeout = jiffies + ctx->sq_thread_idle; |
6c271ce2 JA |
6625 | } |
6626 | ||
4c6e277c | 6627 | io_run_task_work(); |
b41e9852 | 6628 | |
4349f30e | 6629 | io_sq_thread_drop_mm(); |
181e448d | 6630 | revert_creds(old_cred); |
06058632 | 6631 | |
2bbcd6d3 | 6632 | kthread_parkme(); |
06058632 | 6633 | |
6c271ce2 JA |
6634 | return 0; |
6635 | } | |
6636 | ||
bda52162 JA |
6637 | struct io_wait_queue { |
6638 | struct wait_queue_entry wq; | |
6639 | struct io_ring_ctx *ctx; | |
6640 | unsigned to_wait; | |
6641 | unsigned nr_timeouts; | |
6642 | }; | |
6643 | ||
1d7bb1d5 | 6644 | static inline bool io_should_wake(struct io_wait_queue *iowq, bool noflush) |
bda52162 JA |
6645 | { |
6646 | struct io_ring_ctx *ctx = iowq->ctx; | |
6647 | ||
6648 | /* | |
d195a66e | 6649 | * Wake up if we have enough events, or if a timeout occurred since we |
bda52162 JA |
6650 | * started waiting. For timeouts, we always want to return to userspace, |
6651 | * regardless of event count. | |
6652 | */ | |
1d7bb1d5 | 6653 | return io_cqring_events(ctx, noflush) >= iowq->to_wait || |
bda52162 JA |
6654 | atomic_read(&ctx->cq_timeouts) != iowq->nr_timeouts; |
6655 | } | |
6656 | ||
6657 | static int io_wake_function(struct wait_queue_entry *curr, unsigned int mode, | |
6658 | int wake_flags, void *key) | |
6659 | { | |
6660 | struct io_wait_queue *iowq = container_of(curr, struct io_wait_queue, | |
6661 | wq); | |
6662 | ||
1d7bb1d5 JA |
6663 | /* use noflush == true, as we can't safely rely on locking context */ |
6664 | if (!io_should_wake(iowq, true)) | |
bda52162 JA |
6665 | return -1; |
6666 | ||
6667 | return autoremove_wake_function(curr, mode, wake_flags, key); | |
6668 | } | |
6669 | ||
2b188cc1 JA |
6670 | /* |
6671 | * Wait until events become available, if we don't already have some. The | |
6672 | * application must reap them itself, as they reside on the shared cq ring. | |
6673 | */ | |
6674 | static int io_cqring_wait(struct io_ring_ctx *ctx, int min_events, | |
6675 | const sigset_t __user *sig, size_t sigsz) | |
6676 | { | |
bda52162 JA |
6677 | struct io_wait_queue iowq = { |
6678 | .wq = { | |
6679 | .private = current, | |
6680 | .func = io_wake_function, | |
6681 | .entry = LIST_HEAD_INIT(iowq.wq.entry), | |
6682 | }, | |
6683 | .ctx = ctx, | |
6684 | .to_wait = min_events, | |
6685 | }; | |
75b28aff | 6686 | struct io_rings *rings = ctx->rings; |
e9ffa5c2 | 6687 | int ret = 0; |
2b188cc1 | 6688 | |
b41e9852 JA |
6689 | do { |
6690 | if (io_cqring_events(ctx, false) >= min_events) | |
6691 | return 0; | |
4c6e277c | 6692 | if (!io_run_task_work()) |
b41e9852 | 6693 | break; |
b41e9852 | 6694 | } while (1); |
2b188cc1 JA |
6695 | |
6696 | if (sig) { | |
9e75ad5d AB |
6697 | #ifdef CONFIG_COMPAT |
6698 | if (in_compat_syscall()) | |
6699 | ret = set_compat_user_sigmask((const compat_sigset_t __user *)sig, | |
b772434b | 6700 | sigsz); |
9e75ad5d AB |
6701 | else |
6702 | #endif | |
b772434b | 6703 | ret = set_user_sigmask(sig, sigsz); |
9e75ad5d | 6704 | |
2b188cc1 JA |
6705 | if (ret) |
6706 | return ret; | |
6707 | } | |
6708 | ||
bda52162 | 6709 | iowq.nr_timeouts = atomic_read(&ctx->cq_timeouts); |
c826bd7a | 6710 | trace_io_uring_cqring_wait(ctx, min_events); |
bda52162 JA |
6711 | do { |
6712 | prepare_to_wait_exclusive(&ctx->wait, &iowq.wq, | |
6713 | TASK_INTERRUPTIBLE); | |
ce593a6c | 6714 | /* make sure we run task_work before checking for signals */ |
4c6e277c JA |
6715 | if (io_run_task_work()) |
6716 | continue; | |
bda52162 | 6717 | if (signal_pending(current)) { |
b7db41c9 JA |
6718 | if (current->jobctl & JOBCTL_TASK_WORK) { |
6719 | spin_lock_irq(¤t->sighand->siglock); | |
6720 | current->jobctl &= ~JOBCTL_TASK_WORK; | |
6721 | recalc_sigpending(); | |
6722 | spin_unlock_irq(¤t->sighand->siglock); | |
6723 | continue; | |
6724 | } | |
6725 | ret = -EINTR; | |
bda52162 JA |
6726 | break; |
6727 | } | |
ce593a6c JA |
6728 | if (io_should_wake(&iowq, false)) |
6729 | break; | |
6730 | schedule(); | |
bda52162 JA |
6731 | } while (1); |
6732 | finish_wait(&ctx->wait, &iowq.wq); | |
6733 | ||
b7db41c9 | 6734 | restore_saved_sigmask_unless(ret == -EINTR); |
2b188cc1 | 6735 | |
75b28aff | 6736 | return READ_ONCE(rings->cq.head) == READ_ONCE(rings->cq.tail) ? ret : 0; |
2b188cc1 JA |
6737 | } |
6738 | ||
6b06314c JA |
6739 | static void __io_sqe_files_unregister(struct io_ring_ctx *ctx) |
6740 | { | |
6741 | #if defined(CONFIG_UNIX) | |
6742 | if (ctx->ring_sock) { | |
6743 | struct sock *sock = ctx->ring_sock->sk; | |
6744 | struct sk_buff *skb; | |
6745 | ||
6746 | while ((skb = skb_dequeue(&sock->sk_receive_queue)) != NULL) | |
6747 | kfree_skb(skb); | |
6748 | } | |
6749 | #else | |
6750 | int i; | |
6751 | ||
65e19f54 JA |
6752 | for (i = 0; i < ctx->nr_user_files; i++) { |
6753 | struct file *file; | |
6754 | ||
6755 | file = io_file_from_index(ctx, i); | |
6756 | if (file) | |
6757 | fput(file); | |
6758 | } | |
6b06314c JA |
6759 | #endif |
6760 | } | |
6761 | ||
05f3fb3c JA |
6762 | static void io_file_ref_kill(struct percpu_ref *ref) |
6763 | { | |
6764 | struct fixed_file_data *data; | |
6765 | ||
6766 | data = container_of(ref, struct fixed_file_data, refs); | |
6767 | complete(&data->done); | |
6768 | } | |
6769 | ||
6b06314c JA |
6770 | static int io_sqe_files_unregister(struct io_ring_ctx *ctx) |
6771 | { | |
05f3fb3c | 6772 | struct fixed_file_data *data = ctx->file_data; |
05589553 | 6773 | struct fixed_file_ref_node *ref_node = NULL; |
65e19f54 JA |
6774 | unsigned nr_tables, i; |
6775 | ||
05f3fb3c | 6776 | if (!data) |
6b06314c JA |
6777 | return -ENXIO; |
6778 | ||
6a4d07cd | 6779 | spin_lock(&data->lock); |
05589553 XW |
6780 | if (!list_empty(&data->ref_list)) |
6781 | ref_node = list_first_entry(&data->ref_list, | |
6782 | struct fixed_file_ref_node, node); | |
6a4d07cd | 6783 | spin_unlock(&data->lock); |
05589553 XW |
6784 | if (ref_node) |
6785 | percpu_ref_kill(&ref_node->refs); | |
6786 | ||
6787 | percpu_ref_kill(&data->refs); | |
6788 | ||
6789 | /* wait for all refs nodes to complete */ | |
4a38aed2 | 6790 | flush_delayed_work(&ctx->file_put_work); |
2faf852d | 6791 | wait_for_completion(&data->done); |
05f3fb3c | 6792 | |
6b06314c | 6793 | __io_sqe_files_unregister(ctx); |
65e19f54 JA |
6794 | nr_tables = DIV_ROUND_UP(ctx->nr_user_files, IORING_MAX_FILES_TABLE); |
6795 | for (i = 0; i < nr_tables; i++) | |
05f3fb3c JA |
6796 | kfree(data->table[i].files); |
6797 | kfree(data->table); | |
05589553 XW |
6798 | percpu_ref_exit(&data->refs); |
6799 | kfree(data); | |
05f3fb3c | 6800 | ctx->file_data = NULL; |
6b06314c JA |
6801 | ctx->nr_user_files = 0; |
6802 | return 0; | |
6803 | } | |
6804 | ||
6c271ce2 JA |
6805 | static void io_sq_thread_stop(struct io_ring_ctx *ctx) |
6806 | { | |
6807 | if (ctx->sqo_thread) { | |
0f158b4c | 6808 | wait_for_completion(&ctx->sq_thread_comp); |
2bbcd6d3 RP |
6809 | /* |
6810 | * The park is a bit of a work-around, without it we get | |
6811 | * warning spews on shutdown with SQPOLL set and affinity | |
6812 | * set to a single CPU. | |
6813 | */ | |
06058632 | 6814 | kthread_park(ctx->sqo_thread); |
6c271ce2 JA |
6815 | kthread_stop(ctx->sqo_thread); |
6816 | ctx->sqo_thread = NULL; | |
6817 | } | |
6818 | } | |
6819 | ||
6b06314c JA |
6820 | static void io_finish_async(struct io_ring_ctx *ctx) |
6821 | { | |
6c271ce2 JA |
6822 | io_sq_thread_stop(ctx); |
6823 | ||
561fb04a JA |
6824 | if (ctx->io_wq) { |
6825 | io_wq_destroy(ctx->io_wq); | |
6826 | ctx->io_wq = NULL; | |
6b06314c JA |
6827 | } |
6828 | } | |
6829 | ||
6830 | #if defined(CONFIG_UNIX) | |
6b06314c JA |
6831 | /* |
6832 | * Ensure the UNIX gc is aware of our file set, so we are certain that | |
6833 | * the io_uring can be safely unregistered on process exit, even if we have | |
6834 | * loops in the file referencing. | |
6835 | */ | |
6836 | static int __io_sqe_files_scm(struct io_ring_ctx *ctx, int nr, int offset) | |
6837 | { | |
6838 | struct sock *sk = ctx->ring_sock->sk; | |
6839 | struct scm_fp_list *fpl; | |
6840 | struct sk_buff *skb; | |
08a45173 | 6841 | int i, nr_files; |
6b06314c | 6842 | |
6b06314c JA |
6843 | fpl = kzalloc(sizeof(*fpl), GFP_KERNEL); |
6844 | if (!fpl) | |
6845 | return -ENOMEM; | |
6846 | ||
6847 | skb = alloc_skb(0, GFP_KERNEL); | |
6848 | if (!skb) { | |
6849 | kfree(fpl); | |
6850 | return -ENOMEM; | |
6851 | } | |
6852 | ||
6853 | skb->sk = sk; | |
6b06314c | 6854 | |
08a45173 | 6855 | nr_files = 0; |
6b06314c JA |
6856 | fpl->user = get_uid(ctx->user); |
6857 | for (i = 0; i < nr; i++) { | |
65e19f54 JA |
6858 | struct file *file = io_file_from_index(ctx, i + offset); |
6859 | ||
6860 | if (!file) | |
08a45173 | 6861 | continue; |
65e19f54 | 6862 | fpl->fp[nr_files] = get_file(file); |
08a45173 JA |
6863 | unix_inflight(fpl->user, fpl->fp[nr_files]); |
6864 | nr_files++; | |
6b06314c JA |
6865 | } |
6866 | ||
08a45173 JA |
6867 | if (nr_files) { |
6868 | fpl->max = SCM_MAX_FD; | |
6869 | fpl->count = nr_files; | |
6870 | UNIXCB(skb).fp = fpl; | |
05f3fb3c | 6871 | skb->destructor = unix_destruct_scm; |
08a45173 JA |
6872 | refcount_add(skb->truesize, &sk->sk_wmem_alloc); |
6873 | skb_queue_head(&sk->sk_receive_queue, skb); | |
6b06314c | 6874 | |
08a45173 JA |
6875 | for (i = 0; i < nr_files; i++) |
6876 | fput(fpl->fp[i]); | |
6877 | } else { | |
6878 | kfree_skb(skb); | |
6879 | kfree(fpl); | |
6880 | } | |
6b06314c JA |
6881 | |
6882 | return 0; | |
6883 | } | |
6884 | ||
6885 | /* | |
6886 | * If UNIX sockets are enabled, fd passing can cause a reference cycle which | |
6887 | * causes regular reference counting to break down. We rely on the UNIX | |
6888 | * garbage collection to take care of this problem for us. | |
6889 | */ | |
6890 | static int io_sqe_files_scm(struct io_ring_ctx *ctx) | |
6891 | { | |
6892 | unsigned left, total; | |
6893 | int ret = 0; | |
6894 | ||
6895 | total = 0; | |
6896 | left = ctx->nr_user_files; | |
6897 | while (left) { | |
6898 | unsigned this_files = min_t(unsigned, left, SCM_MAX_FD); | |
6b06314c JA |
6899 | |
6900 | ret = __io_sqe_files_scm(ctx, this_files, total); | |
6901 | if (ret) | |
6902 | break; | |
6903 | left -= this_files; | |
6904 | total += this_files; | |
6905 | } | |
6906 | ||
6907 | if (!ret) | |
6908 | return 0; | |
6909 | ||
6910 | while (total < ctx->nr_user_files) { | |
65e19f54 JA |
6911 | struct file *file = io_file_from_index(ctx, total); |
6912 | ||
6913 | if (file) | |
6914 | fput(file); | |
6b06314c JA |
6915 | total++; |
6916 | } | |
6917 | ||
6918 | return ret; | |
6919 | } | |
6920 | #else | |
6921 | static int io_sqe_files_scm(struct io_ring_ctx *ctx) | |
6922 | { | |
6923 | return 0; | |
6924 | } | |
6925 | #endif | |
6926 | ||
65e19f54 JA |
6927 | static int io_sqe_alloc_file_tables(struct io_ring_ctx *ctx, unsigned nr_tables, |
6928 | unsigned nr_files) | |
6929 | { | |
6930 | int i; | |
6931 | ||
6932 | for (i = 0; i < nr_tables; i++) { | |
05f3fb3c | 6933 | struct fixed_file_table *table = &ctx->file_data->table[i]; |
65e19f54 JA |
6934 | unsigned this_files; |
6935 | ||
6936 | this_files = min(nr_files, IORING_MAX_FILES_TABLE); | |
6937 | table->files = kcalloc(this_files, sizeof(struct file *), | |
6938 | GFP_KERNEL); | |
6939 | if (!table->files) | |
6940 | break; | |
6941 | nr_files -= this_files; | |
6942 | } | |
6943 | ||
6944 | if (i == nr_tables) | |
6945 | return 0; | |
6946 | ||
6947 | for (i = 0; i < nr_tables; i++) { | |
05f3fb3c | 6948 | struct fixed_file_table *table = &ctx->file_data->table[i]; |
65e19f54 JA |
6949 | kfree(table->files); |
6950 | } | |
6951 | return 1; | |
6952 | } | |
6953 | ||
05f3fb3c JA |
6954 | static void io_ring_file_put(struct io_ring_ctx *ctx, struct file *file) |
6955 | { | |
6956 | #if defined(CONFIG_UNIX) | |
6957 | struct sock *sock = ctx->ring_sock->sk; | |
6958 | struct sk_buff_head list, *head = &sock->sk_receive_queue; | |
6959 | struct sk_buff *skb; | |
6960 | int i; | |
6961 | ||
6962 | __skb_queue_head_init(&list); | |
6963 | ||
6964 | /* | |
6965 | * Find the skb that holds this file in its SCM_RIGHTS. When found, | |
6966 | * remove this entry and rearrange the file array. | |
6967 | */ | |
6968 | skb = skb_dequeue(head); | |
6969 | while (skb) { | |
6970 | struct scm_fp_list *fp; | |
6971 | ||
6972 | fp = UNIXCB(skb).fp; | |
6973 | for (i = 0; i < fp->count; i++) { | |
6974 | int left; | |
6975 | ||
6976 | if (fp->fp[i] != file) | |
6977 | continue; | |
6978 | ||
6979 | unix_notinflight(fp->user, fp->fp[i]); | |
6980 | left = fp->count - 1 - i; | |
6981 | if (left) { | |
6982 | memmove(&fp->fp[i], &fp->fp[i + 1], | |
6983 | left * sizeof(struct file *)); | |
6984 | } | |
6985 | fp->count--; | |
6986 | if (!fp->count) { | |
6987 | kfree_skb(skb); | |
6988 | skb = NULL; | |
6989 | } else { | |
6990 | __skb_queue_tail(&list, skb); | |
6991 | } | |
6992 | fput(file); | |
6993 | file = NULL; | |
6994 | break; | |
6995 | } | |
6996 | ||
6997 | if (!file) | |
6998 | break; | |
6999 | ||
7000 | __skb_queue_tail(&list, skb); | |
7001 | ||
7002 | skb = skb_dequeue(head); | |
7003 | } | |
7004 | ||
7005 | if (skb_peek(&list)) { | |
7006 | spin_lock_irq(&head->lock); | |
7007 | while ((skb = __skb_dequeue(&list)) != NULL) | |
7008 | __skb_queue_tail(head, skb); | |
7009 | spin_unlock_irq(&head->lock); | |
7010 | } | |
7011 | #else | |
7012 | fput(file); | |
7013 | #endif | |
7014 | } | |
7015 | ||
7016 | struct io_file_put { | |
05589553 | 7017 | struct list_head list; |
05f3fb3c | 7018 | struct file *file; |
05f3fb3c JA |
7019 | }; |
7020 | ||
4a38aed2 | 7021 | static void __io_file_put_work(struct fixed_file_ref_node *ref_node) |
65e19f54 | 7022 | { |
4a38aed2 JA |
7023 | struct fixed_file_data *file_data = ref_node->file_data; |
7024 | struct io_ring_ctx *ctx = file_data->ctx; | |
05f3fb3c | 7025 | struct io_file_put *pfile, *tmp; |
05589553 XW |
7026 | |
7027 | list_for_each_entry_safe(pfile, tmp, &ref_node->file_list, list) { | |
6a4d07cd | 7028 | list_del(&pfile->list); |
05589553 XW |
7029 | io_ring_file_put(ctx, pfile->file); |
7030 | kfree(pfile); | |
65e19f54 | 7031 | } |
05589553 | 7032 | |
6a4d07cd JA |
7033 | spin_lock(&file_data->lock); |
7034 | list_del(&ref_node->node); | |
7035 | spin_unlock(&file_data->lock); | |
05589553 XW |
7036 | |
7037 | percpu_ref_exit(&ref_node->refs); | |
7038 | kfree(ref_node); | |
7039 | percpu_ref_put(&file_data->refs); | |
2faf852d | 7040 | } |
65e19f54 | 7041 | |
4a38aed2 JA |
7042 | static void io_file_put_work(struct work_struct *work) |
7043 | { | |
7044 | struct io_ring_ctx *ctx; | |
7045 | struct llist_node *node; | |
7046 | ||
7047 | ctx = container_of(work, struct io_ring_ctx, file_put_work.work); | |
7048 | node = llist_del_all(&ctx->file_put_llist); | |
7049 | ||
7050 | while (node) { | |
7051 | struct fixed_file_ref_node *ref_node; | |
7052 | struct llist_node *next = node->next; | |
7053 | ||
7054 | ref_node = llist_entry(node, struct fixed_file_ref_node, llist); | |
7055 | __io_file_put_work(ref_node); | |
7056 | node = next; | |
7057 | } | |
7058 | } | |
7059 | ||
05589553 | 7060 | static void io_file_data_ref_zero(struct percpu_ref *ref) |
2faf852d | 7061 | { |
05589553 | 7062 | struct fixed_file_ref_node *ref_node; |
4a38aed2 JA |
7063 | struct io_ring_ctx *ctx; |
7064 | bool first_add; | |
7065 | int delay = HZ; | |
65e19f54 | 7066 | |
05589553 | 7067 | ref_node = container_of(ref, struct fixed_file_ref_node, refs); |
4a38aed2 | 7068 | ctx = ref_node->file_data->ctx; |
05589553 | 7069 | |
4a38aed2 JA |
7070 | if (percpu_ref_is_dying(&ctx->file_data->refs)) |
7071 | delay = 0; | |
05589553 | 7072 | |
4a38aed2 JA |
7073 | first_add = llist_add(&ref_node->llist, &ctx->file_put_llist); |
7074 | if (!delay) | |
7075 | mod_delayed_work(system_wq, &ctx->file_put_work, 0); | |
7076 | else if (first_add) | |
7077 | queue_delayed_work(system_wq, &ctx->file_put_work, delay); | |
05f3fb3c | 7078 | } |
65e19f54 | 7079 | |
05589553 XW |
7080 | static struct fixed_file_ref_node *alloc_fixed_file_ref_node( |
7081 | struct io_ring_ctx *ctx) | |
05f3fb3c | 7082 | { |
05589553 | 7083 | struct fixed_file_ref_node *ref_node; |
05f3fb3c | 7084 | |
05589553 XW |
7085 | ref_node = kzalloc(sizeof(*ref_node), GFP_KERNEL); |
7086 | if (!ref_node) | |
7087 | return ERR_PTR(-ENOMEM); | |
05f3fb3c | 7088 | |
05589553 XW |
7089 | if (percpu_ref_init(&ref_node->refs, io_file_data_ref_zero, |
7090 | 0, GFP_KERNEL)) { | |
7091 | kfree(ref_node); | |
7092 | return ERR_PTR(-ENOMEM); | |
7093 | } | |
7094 | INIT_LIST_HEAD(&ref_node->node); | |
7095 | INIT_LIST_HEAD(&ref_node->file_list); | |
05589553 XW |
7096 | ref_node->file_data = ctx->file_data; |
7097 | return ref_node; | |
05589553 XW |
7098 | } |
7099 | ||
7100 | static void destroy_fixed_file_ref_node(struct fixed_file_ref_node *ref_node) | |
7101 | { | |
7102 | percpu_ref_exit(&ref_node->refs); | |
7103 | kfree(ref_node); | |
65e19f54 JA |
7104 | } |
7105 | ||
6b06314c JA |
7106 | static int io_sqe_files_register(struct io_ring_ctx *ctx, void __user *arg, |
7107 | unsigned nr_args) | |
7108 | { | |
7109 | __s32 __user *fds = (__s32 __user *) arg; | |
65e19f54 | 7110 | unsigned nr_tables; |
05f3fb3c | 7111 | struct file *file; |
6b06314c JA |
7112 | int fd, ret = 0; |
7113 | unsigned i; | |
05589553 | 7114 | struct fixed_file_ref_node *ref_node; |
6b06314c | 7115 | |
05f3fb3c | 7116 | if (ctx->file_data) |
6b06314c JA |
7117 | return -EBUSY; |
7118 | if (!nr_args) | |
7119 | return -EINVAL; | |
7120 | if (nr_args > IORING_MAX_FIXED_FILES) | |
7121 | return -EMFILE; | |
7122 | ||
05f3fb3c JA |
7123 | ctx->file_data = kzalloc(sizeof(*ctx->file_data), GFP_KERNEL); |
7124 | if (!ctx->file_data) | |
7125 | return -ENOMEM; | |
7126 | ctx->file_data->ctx = ctx; | |
7127 | init_completion(&ctx->file_data->done); | |
05589553 | 7128 | INIT_LIST_HEAD(&ctx->file_data->ref_list); |
f7fe9346 | 7129 | spin_lock_init(&ctx->file_data->lock); |
05f3fb3c | 7130 | |
65e19f54 | 7131 | nr_tables = DIV_ROUND_UP(nr_args, IORING_MAX_FILES_TABLE); |
05f3fb3c JA |
7132 | ctx->file_data->table = kcalloc(nr_tables, |
7133 | sizeof(struct fixed_file_table), | |
65e19f54 | 7134 | GFP_KERNEL); |
05f3fb3c JA |
7135 | if (!ctx->file_data->table) { |
7136 | kfree(ctx->file_data); | |
7137 | ctx->file_data = NULL; | |
6b06314c | 7138 | return -ENOMEM; |
05f3fb3c JA |
7139 | } |
7140 | ||
05589553 | 7141 | if (percpu_ref_init(&ctx->file_data->refs, io_file_ref_kill, |
05f3fb3c JA |
7142 | PERCPU_REF_ALLOW_REINIT, GFP_KERNEL)) { |
7143 | kfree(ctx->file_data->table); | |
7144 | kfree(ctx->file_data); | |
7145 | ctx->file_data = NULL; | |
6b06314c | 7146 | return -ENOMEM; |
05f3fb3c | 7147 | } |
6b06314c | 7148 | |
65e19f54 | 7149 | if (io_sqe_alloc_file_tables(ctx, nr_tables, nr_args)) { |
05f3fb3c JA |
7150 | percpu_ref_exit(&ctx->file_data->refs); |
7151 | kfree(ctx->file_data->table); | |
7152 | kfree(ctx->file_data); | |
7153 | ctx->file_data = NULL; | |
65e19f54 JA |
7154 | return -ENOMEM; |
7155 | } | |
7156 | ||
08a45173 | 7157 | for (i = 0; i < nr_args; i++, ctx->nr_user_files++) { |
65e19f54 JA |
7158 | struct fixed_file_table *table; |
7159 | unsigned index; | |
7160 | ||
6b06314c JA |
7161 | ret = -EFAULT; |
7162 | if (copy_from_user(&fd, &fds[i], sizeof(fd))) | |
7163 | break; | |
08a45173 JA |
7164 | /* allow sparse sets */ |
7165 | if (fd == -1) { | |
7166 | ret = 0; | |
7167 | continue; | |
7168 | } | |
6b06314c | 7169 | |
05f3fb3c | 7170 | table = &ctx->file_data->table[i >> IORING_FILE_TABLE_SHIFT]; |
65e19f54 | 7171 | index = i & IORING_FILE_TABLE_MASK; |
05f3fb3c | 7172 | file = fget(fd); |
6b06314c JA |
7173 | |
7174 | ret = -EBADF; | |
05f3fb3c | 7175 | if (!file) |
6b06314c | 7176 | break; |
05f3fb3c | 7177 | |
6b06314c JA |
7178 | /* |
7179 | * Don't allow io_uring instances to be registered. If UNIX | |
7180 | * isn't enabled, then this causes a reference cycle and this | |
7181 | * instance can never get freed. If UNIX is enabled we'll | |
7182 | * handle it just fine, but there's still no point in allowing | |
7183 | * a ring fd as it doesn't support regular read/write anyway. | |
7184 | */ | |
05f3fb3c JA |
7185 | if (file->f_op == &io_uring_fops) { |
7186 | fput(file); | |
6b06314c JA |
7187 | break; |
7188 | } | |
6b06314c | 7189 | ret = 0; |
05f3fb3c | 7190 | table->files[index] = file; |
6b06314c JA |
7191 | } |
7192 | ||
7193 | if (ret) { | |
65e19f54 | 7194 | for (i = 0; i < ctx->nr_user_files; i++) { |
65e19f54 JA |
7195 | file = io_file_from_index(ctx, i); |
7196 | if (file) | |
7197 | fput(file); | |
7198 | } | |
7199 | for (i = 0; i < nr_tables; i++) | |
05f3fb3c | 7200 | kfree(ctx->file_data->table[i].files); |
6b06314c | 7201 | |
667e57da | 7202 | percpu_ref_exit(&ctx->file_data->refs); |
05f3fb3c JA |
7203 | kfree(ctx->file_data->table); |
7204 | kfree(ctx->file_data); | |
7205 | ctx->file_data = NULL; | |
6b06314c JA |
7206 | ctx->nr_user_files = 0; |
7207 | return ret; | |
7208 | } | |
7209 | ||
7210 | ret = io_sqe_files_scm(ctx); | |
05589553 | 7211 | if (ret) { |
6b06314c | 7212 | io_sqe_files_unregister(ctx); |
05589553 XW |
7213 | return ret; |
7214 | } | |
6b06314c | 7215 | |
05589553 XW |
7216 | ref_node = alloc_fixed_file_ref_node(ctx); |
7217 | if (IS_ERR(ref_node)) { | |
7218 | io_sqe_files_unregister(ctx); | |
7219 | return PTR_ERR(ref_node); | |
7220 | } | |
7221 | ||
7222 | ctx->file_data->cur_refs = &ref_node->refs; | |
6a4d07cd | 7223 | spin_lock(&ctx->file_data->lock); |
05589553 | 7224 | list_add(&ref_node->node, &ctx->file_data->ref_list); |
6a4d07cd | 7225 | spin_unlock(&ctx->file_data->lock); |
05589553 | 7226 | percpu_ref_get(&ctx->file_data->refs); |
6b06314c JA |
7227 | return ret; |
7228 | } | |
7229 | ||
c3a31e60 JA |
7230 | static int io_sqe_file_register(struct io_ring_ctx *ctx, struct file *file, |
7231 | int index) | |
7232 | { | |
7233 | #if defined(CONFIG_UNIX) | |
7234 | struct sock *sock = ctx->ring_sock->sk; | |
7235 | struct sk_buff_head *head = &sock->sk_receive_queue; | |
7236 | struct sk_buff *skb; | |
7237 | ||
7238 | /* | |
7239 | * See if we can merge this file into an existing skb SCM_RIGHTS | |
7240 | * file set. If there's no room, fall back to allocating a new skb | |
7241 | * and filling it in. | |
7242 | */ | |
7243 | spin_lock_irq(&head->lock); | |
7244 | skb = skb_peek(head); | |
7245 | if (skb) { | |
7246 | struct scm_fp_list *fpl = UNIXCB(skb).fp; | |
7247 | ||
7248 | if (fpl->count < SCM_MAX_FD) { | |
7249 | __skb_unlink(skb, head); | |
7250 | spin_unlock_irq(&head->lock); | |
7251 | fpl->fp[fpl->count] = get_file(file); | |
7252 | unix_inflight(fpl->user, fpl->fp[fpl->count]); | |
7253 | fpl->count++; | |
7254 | spin_lock_irq(&head->lock); | |
7255 | __skb_queue_head(head, skb); | |
7256 | } else { | |
7257 | skb = NULL; | |
7258 | } | |
7259 | } | |
7260 | spin_unlock_irq(&head->lock); | |
7261 | ||
7262 | if (skb) { | |
7263 | fput(file); | |
7264 | return 0; | |
7265 | } | |
7266 | ||
7267 | return __io_sqe_files_scm(ctx, 1, index); | |
7268 | #else | |
7269 | return 0; | |
7270 | #endif | |
7271 | } | |
7272 | ||
a5318d3c | 7273 | static int io_queue_file_removal(struct fixed_file_data *data, |
05589553 | 7274 | struct file *file) |
05f3fb3c | 7275 | { |
a5318d3c | 7276 | struct io_file_put *pfile; |
05589553 XW |
7277 | struct percpu_ref *refs = data->cur_refs; |
7278 | struct fixed_file_ref_node *ref_node; | |
05f3fb3c | 7279 | |
05f3fb3c | 7280 | pfile = kzalloc(sizeof(*pfile), GFP_KERNEL); |
a5318d3c HD |
7281 | if (!pfile) |
7282 | return -ENOMEM; | |
05f3fb3c | 7283 | |
05589553 | 7284 | ref_node = container_of(refs, struct fixed_file_ref_node, refs); |
05f3fb3c | 7285 | pfile->file = file; |
05589553 XW |
7286 | list_add(&pfile->list, &ref_node->file_list); |
7287 | ||
a5318d3c | 7288 | return 0; |
05f3fb3c JA |
7289 | } |
7290 | ||
7291 | static int __io_sqe_files_update(struct io_ring_ctx *ctx, | |
7292 | struct io_uring_files_update *up, | |
7293 | unsigned nr_args) | |
7294 | { | |
7295 | struct fixed_file_data *data = ctx->file_data; | |
05589553 | 7296 | struct fixed_file_ref_node *ref_node; |
05f3fb3c | 7297 | struct file *file; |
c3a31e60 JA |
7298 | __s32 __user *fds; |
7299 | int fd, i, err; | |
7300 | __u32 done; | |
05589553 | 7301 | bool needs_switch = false; |
c3a31e60 | 7302 | |
05f3fb3c | 7303 | if (check_add_overflow(up->offset, nr_args, &done)) |
c3a31e60 JA |
7304 | return -EOVERFLOW; |
7305 | if (done > ctx->nr_user_files) | |
7306 | return -EINVAL; | |
7307 | ||
05589553 XW |
7308 | ref_node = alloc_fixed_file_ref_node(ctx); |
7309 | if (IS_ERR(ref_node)) | |
7310 | return PTR_ERR(ref_node); | |
7311 | ||
c3a31e60 | 7312 | done = 0; |
05f3fb3c | 7313 | fds = u64_to_user_ptr(up->fds); |
c3a31e60 | 7314 | while (nr_args) { |
65e19f54 JA |
7315 | struct fixed_file_table *table; |
7316 | unsigned index; | |
7317 | ||
c3a31e60 JA |
7318 | err = 0; |
7319 | if (copy_from_user(&fd, &fds[done], sizeof(fd))) { | |
7320 | err = -EFAULT; | |
7321 | break; | |
7322 | } | |
05f3fb3c JA |
7323 | i = array_index_nospec(up->offset, ctx->nr_user_files); |
7324 | table = &ctx->file_data->table[i >> IORING_FILE_TABLE_SHIFT]; | |
65e19f54 JA |
7325 | index = i & IORING_FILE_TABLE_MASK; |
7326 | if (table->files[index]) { | |
05f3fb3c | 7327 | file = io_file_from_index(ctx, index); |
a5318d3c HD |
7328 | err = io_queue_file_removal(data, file); |
7329 | if (err) | |
7330 | break; | |
65e19f54 | 7331 | table->files[index] = NULL; |
05589553 | 7332 | needs_switch = true; |
c3a31e60 JA |
7333 | } |
7334 | if (fd != -1) { | |
c3a31e60 JA |
7335 | file = fget(fd); |
7336 | if (!file) { | |
7337 | err = -EBADF; | |
7338 | break; | |
7339 | } | |
7340 | /* | |
7341 | * Don't allow io_uring instances to be registered. If | |
7342 | * UNIX isn't enabled, then this causes a reference | |
7343 | * cycle and this instance can never get freed. If UNIX | |
7344 | * is enabled we'll handle it just fine, but there's | |
7345 | * still no point in allowing a ring fd as it doesn't | |
7346 | * support regular read/write anyway. | |
7347 | */ | |
7348 | if (file->f_op == &io_uring_fops) { | |
7349 | fput(file); | |
7350 | err = -EBADF; | |
7351 | break; | |
7352 | } | |
65e19f54 | 7353 | table->files[index] = file; |
c3a31e60 | 7354 | err = io_sqe_file_register(ctx, file, i); |
f3bd9dae YY |
7355 | if (err) { |
7356 | fput(file); | |
c3a31e60 | 7357 | break; |
f3bd9dae | 7358 | } |
c3a31e60 JA |
7359 | } |
7360 | nr_args--; | |
7361 | done++; | |
05f3fb3c JA |
7362 | up->offset++; |
7363 | } | |
7364 | ||
05589553 XW |
7365 | if (needs_switch) { |
7366 | percpu_ref_kill(data->cur_refs); | |
6a4d07cd | 7367 | spin_lock(&data->lock); |
05589553 XW |
7368 | list_add(&ref_node->node, &data->ref_list); |
7369 | data->cur_refs = &ref_node->refs; | |
6a4d07cd | 7370 | spin_unlock(&data->lock); |
05589553 XW |
7371 | percpu_ref_get(&ctx->file_data->refs); |
7372 | } else | |
7373 | destroy_fixed_file_ref_node(ref_node); | |
c3a31e60 JA |
7374 | |
7375 | return done ? done : err; | |
7376 | } | |
05589553 | 7377 | |
05f3fb3c JA |
7378 | static int io_sqe_files_update(struct io_ring_ctx *ctx, void __user *arg, |
7379 | unsigned nr_args) | |
7380 | { | |
7381 | struct io_uring_files_update up; | |
7382 | ||
7383 | if (!ctx->file_data) | |
7384 | return -ENXIO; | |
7385 | if (!nr_args) | |
7386 | return -EINVAL; | |
7387 | if (copy_from_user(&up, arg, sizeof(up))) | |
7388 | return -EFAULT; | |
7389 | if (up.resv) | |
7390 | return -EINVAL; | |
7391 | ||
7392 | return __io_sqe_files_update(ctx, &up, nr_args); | |
7393 | } | |
c3a31e60 | 7394 | |
e9fd9396 | 7395 | static void io_free_work(struct io_wq_work *work) |
7d723065 JA |
7396 | { |
7397 | struct io_kiocb *req = container_of(work, struct io_kiocb, work); | |
7398 | ||
e9fd9396 | 7399 | /* Consider that io_steal_work() relies on this ref */ |
7d723065 JA |
7400 | io_put_req(req); |
7401 | } | |
7402 | ||
24369c2e PB |
7403 | static int io_init_wq_offload(struct io_ring_ctx *ctx, |
7404 | struct io_uring_params *p) | |
7405 | { | |
7406 | struct io_wq_data data; | |
7407 | struct fd f; | |
7408 | struct io_ring_ctx *ctx_attach; | |
7409 | unsigned int concurrency; | |
7410 | int ret = 0; | |
7411 | ||
7412 | data.user = ctx->user; | |
e9fd9396 | 7413 | data.free_work = io_free_work; |
f5fa38c5 | 7414 | data.do_work = io_wq_submit_work; |
24369c2e PB |
7415 | |
7416 | if (!(p->flags & IORING_SETUP_ATTACH_WQ)) { | |
7417 | /* Do QD, or 4 * CPUS, whatever is smallest */ | |
7418 | concurrency = min(ctx->sq_entries, 4 * num_online_cpus()); | |
7419 | ||
7420 | ctx->io_wq = io_wq_create(concurrency, &data); | |
7421 | if (IS_ERR(ctx->io_wq)) { | |
7422 | ret = PTR_ERR(ctx->io_wq); | |
7423 | ctx->io_wq = NULL; | |
7424 | } | |
7425 | return ret; | |
7426 | } | |
7427 | ||
7428 | f = fdget(p->wq_fd); | |
7429 | if (!f.file) | |
7430 | return -EBADF; | |
7431 | ||
7432 | if (f.file->f_op != &io_uring_fops) { | |
7433 | ret = -EINVAL; | |
7434 | goto out_fput; | |
7435 | } | |
7436 | ||
7437 | ctx_attach = f.file->private_data; | |
7438 | /* @io_wq is protected by holding the fd */ | |
7439 | if (!io_wq_get(ctx_attach->io_wq, &data)) { | |
7440 | ret = -EINVAL; | |
7441 | goto out_fput; | |
7442 | } | |
7443 | ||
7444 | ctx->io_wq = ctx_attach->io_wq; | |
7445 | out_fput: | |
7446 | fdput(f); | |
7447 | return ret; | |
7448 | } | |
7449 | ||
6c271ce2 JA |
7450 | static int io_sq_offload_start(struct io_ring_ctx *ctx, |
7451 | struct io_uring_params *p) | |
2b188cc1 JA |
7452 | { |
7453 | int ret; | |
7454 | ||
7455 | mmgrab(current->mm); | |
7456 | ctx->sqo_mm = current->mm; | |
7457 | ||
6c271ce2 | 7458 | if (ctx->flags & IORING_SETUP_SQPOLL) { |
3ec482d1 JA |
7459 | ret = -EPERM; |
7460 | if (!capable(CAP_SYS_ADMIN)) | |
7461 | goto err; | |
7462 | ||
917257da JA |
7463 | ctx->sq_thread_idle = msecs_to_jiffies(p->sq_thread_idle); |
7464 | if (!ctx->sq_thread_idle) | |
7465 | ctx->sq_thread_idle = HZ; | |
7466 | ||
6c271ce2 | 7467 | if (p->flags & IORING_SETUP_SQ_AFF) { |
44a9bd18 | 7468 | int cpu = p->sq_thread_cpu; |
6c271ce2 | 7469 | |
917257da | 7470 | ret = -EINVAL; |
44a9bd18 JA |
7471 | if (cpu >= nr_cpu_ids) |
7472 | goto err; | |
7889f44d | 7473 | if (!cpu_online(cpu)) |
917257da JA |
7474 | goto err; |
7475 | ||
6c271ce2 JA |
7476 | ctx->sqo_thread = kthread_create_on_cpu(io_sq_thread, |
7477 | ctx, cpu, | |
7478 | "io_uring-sq"); | |
7479 | } else { | |
7480 | ctx->sqo_thread = kthread_create(io_sq_thread, ctx, | |
7481 | "io_uring-sq"); | |
7482 | } | |
7483 | if (IS_ERR(ctx->sqo_thread)) { | |
7484 | ret = PTR_ERR(ctx->sqo_thread); | |
7485 | ctx->sqo_thread = NULL; | |
7486 | goto err; | |
7487 | } | |
7488 | wake_up_process(ctx->sqo_thread); | |
7489 | } else if (p->flags & IORING_SETUP_SQ_AFF) { | |
7490 | /* Can't have SQ_AFF without SQPOLL */ | |
7491 | ret = -EINVAL; | |
7492 | goto err; | |
7493 | } | |
7494 | ||
24369c2e PB |
7495 | ret = io_init_wq_offload(ctx, p); |
7496 | if (ret) | |
2b188cc1 | 7497 | goto err; |
2b188cc1 JA |
7498 | |
7499 | return 0; | |
7500 | err: | |
54a91f3b | 7501 | io_finish_async(ctx); |
8eb06d7e PB |
7502 | if (ctx->sqo_mm) { |
7503 | mmdrop(ctx->sqo_mm); | |
7504 | ctx->sqo_mm = NULL; | |
7505 | } | |
2b188cc1 JA |
7506 | return ret; |
7507 | } | |
7508 | ||
a087e2b5 BM |
7509 | static inline void __io_unaccount_mem(struct user_struct *user, |
7510 | unsigned long nr_pages) | |
2b188cc1 JA |
7511 | { |
7512 | atomic_long_sub(nr_pages, &user->locked_vm); | |
7513 | } | |
7514 | ||
a087e2b5 BM |
7515 | static inline int __io_account_mem(struct user_struct *user, |
7516 | unsigned long nr_pages) | |
2b188cc1 JA |
7517 | { |
7518 | unsigned long page_limit, cur_pages, new_pages; | |
7519 | ||
7520 | /* Don't allow more pages than we can safely lock */ | |
7521 | page_limit = rlimit(RLIMIT_MEMLOCK) >> PAGE_SHIFT; | |
7522 | ||
7523 | do { | |
7524 | cur_pages = atomic_long_read(&user->locked_vm); | |
7525 | new_pages = cur_pages + nr_pages; | |
7526 | if (new_pages > page_limit) | |
7527 | return -ENOMEM; | |
7528 | } while (atomic_long_cmpxchg(&user->locked_vm, cur_pages, | |
7529 | new_pages) != cur_pages); | |
7530 | ||
7531 | return 0; | |
7532 | } | |
7533 | ||
2e0464d4 BM |
7534 | static void io_unaccount_mem(struct io_ring_ctx *ctx, unsigned long nr_pages, |
7535 | enum io_mem_account acct) | |
a087e2b5 | 7536 | { |
aad5d8da | 7537 | if (ctx->limit_mem) |
a087e2b5 | 7538 | __io_unaccount_mem(ctx->user, nr_pages); |
30975825 | 7539 | |
2e0464d4 BM |
7540 | if (ctx->sqo_mm) { |
7541 | if (acct == ACCT_LOCKED) | |
7542 | ctx->sqo_mm->locked_vm -= nr_pages; | |
7543 | else if (acct == ACCT_PINNED) | |
7544 | atomic64_sub(nr_pages, &ctx->sqo_mm->pinned_vm); | |
7545 | } | |
a087e2b5 BM |
7546 | } |
7547 | ||
2e0464d4 BM |
7548 | static int io_account_mem(struct io_ring_ctx *ctx, unsigned long nr_pages, |
7549 | enum io_mem_account acct) | |
a087e2b5 | 7550 | { |
30975825 BM |
7551 | int ret; |
7552 | ||
7553 | if (ctx->limit_mem) { | |
7554 | ret = __io_account_mem(ctx->user, nr_pages); | |
7555 | if (ret) | |
7556 | return ret; | |
7557 | } | |
7558 | ||
2e0464d4 BM |
7559 | if (ctx->sqo_mm) { |
7560 | if (acct == ACCT_LOCKED) | |
7561 | ctx->sqo_mm->locked_vm += nr_pages; | |
7562 | else if (acct == ACCT_PINNED) | |
7563 | atomic64_add(nr_pages, &ctx->sqo_mm->pinned_vm); | |
7564 | } | |
a087e2b5 BM |
7565 | |
7566 | return 0; | |
7567 | } | |
7568 | ||
2b188cc1 JA |
7569 | static void io_mem_free(void *ptr) |
7570 | { | |
52e04ef4 MR |
7571 | struct page *page; |
7572 | ||
7573 | if (!ptr) | |
7574 | return; | |
2b188cc1 | 7575 | |
52e04ef4 | 7576 | page = virt_to_head_page(ptr); |
2b188cc1 JA |
7577 | if (put_page_testzero(page)) |
7578 | free_compound_page(page); | |
7579 | } | |
7580 | ||
7581 | static void *io_mem_alloc(size_t size) | |
7582 | { | |
7583 | gfp_t gfp_flags = GFP_KERNEL | __GFP_ZERO | __GFP_NOWARN | __GFP_COMP | | |
7584 | __GFP_NORETRY; | |
7585 | ||
7586 | return (void *) __get_free_pages(gfp_flags, get_order(size)); | |
7587 | } | |
7588 | ||
75b28aff HV |
7589 | static unsigned long rings_size(unsigned sq_entries, unsigned cq_entries, |
7590 | size_t *sq_offset) | |
7591 | { | |
7592 | struct io_rings *rings; | |
7593 | size_t off, sq_array_size; | |
7594 | ||
7595 | off = struct_size(rings, cqes, cq_entries); | |
7596 | if (off == SIZE_MAX) | |
7597 | return SIZE_MAX; | |
7598 | ||
7599 | #ifdef CONFIG_SMP | |
7600 | off = ALIGN(off, SMP_CACHE_BYTES); | |
7601 | if (off == 0) | |
7602 | return SIZE_MAX; | |
7603 | #endif | |
7604 | ||
b36200f5 DV |
7605 | if (sq_offset) |
7606 | *sq_offset = off; | |
7607 | ||
75b28aff HV |
7608 | sq_array_size = array_size(sizeof(u32), sq_entries); |
7609 | if (sq_array_size == SIZE_MAX) | |
7610 | return SIZE_MAX; | |
7611 | ||
7612 | if (check_add_overflow(off, sq_array_size, &off)) | |
7613 | return SIZE_MAX; | |
7614 | ||
75b28aff HV |
7615 | return off; |
7616 | } | |
7617 | ||
2b188cc1 JA |
7618 | static unsigned long ring_pages(unsigned sq_entries, unsigned cq_entries) |
7619 | { | |
75b28aff | 7620 | size_t pages; |
2b188cc1 | 7621 | |
75b28aff HV |
7622 | pages = (size_t)1 << get_order( |
7623 | rings_size(sq_entries, cq_entries, NULL)); | |
7624 | pages += (size_t)1 << get_order( | |
7625 | array_size(sizeof(struct io_uring_sqe), sq_entries)); | |
2b188cc1 | 7626 | |
75b28aff | 7627 | return pages; |
2b188cc1 JA |
7628 | } |
7629 | ||
edafccee JA |
7630 | static int io_sqe_buffer_unregister(struct io_ring_ctx *ctx) |
7631 | { | |
7632 | int i, j; | |
7633 | ||
7634 | if (!ctx->user_bufs) | |
7635 | return -ENXIO; | |
7636 | ||
7637 | for (i = 0; i < ctx->nr_user_bufs; i++) { | |
7638 | struct io_mapped_ubuf *imu = &ctx->user_bufs[i]; | |
7639 | ||
7640 | for (j = 0; j < imu->nr_bvecs; j++) | |
f1f6a7dd | 7641 | unpin_user_page(imu->bvec[j].bv_page); |
edafccee | 7642 | |
2e0464d4 | 7643 | io_unaccount_mem(ctx, imu->nr_bvecs, ACCT_PINNED); |
d4ef6475 | 7644 | kvfree(imu->bvec); |
edafccee JA |
7645 | imu->nr_bvecs = 0; |
7646 | } | |
7647 | ||
7648 | kfree(ctx->user_bufs); | |
7649 | ctx->user_bufs = NULL; | |
7650 | ctx->nr_user_bufs = 0; | |
7651 | return 0; | |
7652 | } | |
7653 | ||
7654 | static int io_copy_iov(struct io_ring_ctx *ctx, struct iovec *dst, | |
7655 | void __user *arg, unsigned index) | |
7656 | { | |
7657 | struct iovec __user *src; | |
7658 | ||
7659 | #ifdef CONFIG_COMPAT | |
7660 | if (ctx->compat) { | |
7661 | struct compat_iovec __user *ciovs; | |
7662 | struct compat_iovec ciov; | |
7663 | ||
7664 | ciovs = (struct compat_iovec __user *) arg; | |
7665 | if (copy_from_user(&ciov, &ciovs[index], sizeof(ciov))) | |
7666 | return -EFAULT; | |
7667 | ||
d55e5f5b | 7668 | dst->iov_base = u64_to_user_ptr((u64)ciov.iov_base); |
edafccee JA |
7669 | dst->iov_len = ciov.iov_len; |
7670 | return 0; | |
7671 | } | |
7672 | #endif | |
7673 | src = (struct iovec __user *) arg; | |
7674 | if (copy_from_user(dst, &src[index], sizeof(*dst))) | |
7675 | return -EFAULT; | |
7676 | return 0; | |
7677 | } | |
7678 | ||
7679 | static int io_sqe_buffer_register(struct io_ring_ctx *ctx, void __user *arg, | |
7680 | unsigned nr_args) | |
7681 | { | |
7682 | struct vm_area_struct **vmas = NULL; | |
7683 | struct page **pages = NULL; | |
7684 | int i, j, got_pages = 0; | |
7685 | int ret = -EINVAL; | |
7686 | ||
7687 | if (ctx->user_bufs) | |
7688 | return -EBUSY; | |
7689 | if (!nr_args || nr_args > UIO_MAXIOV) | |
7690 | return -EINVAL; | |
7691 | ||
7692 | ctx->user_bufs = kcalloc(nr_args, sizeof(struct io_mapped_ubuf), | |
7693 | GFP_KERNEL); | |
7694 | if (!ctx->user_bufs) | |
7695 | return -ENOMEM; | |
7696 | ||
7697 | for (i = 0; i < nr_args; i++) { | |
7698 | struct io_mapped_ubuf *imu = &ctx->user_bufs[i]; | |
7699 | unsigned long off, start, end, ubuf; | |
7700 | int pret, nr_pages; | |
7701 | struct iovec iov; | |
7702 | size_t size; | |
7703 | ||
7704 | ret = io_copy_iov(ctx, &iov, arg, i); | |
7705 | if (ret) | |
a278682d | 7706 | goto err; |
edafccee JA |
7707 | |
7708 | /* | |
7709 | * Don't impose further limits on the size and buffer | |
7710 | * constraints here, we'll -EINVAL later when IO is | |
7711 | * submitted if they are wrong. | |
7712 | */ | |
7713 | ret = -EFAULT; | |
7714 | if (!iov.iov_base || !iov.iov_len) | |
7715 | goto err; | |
7716 | ||
7717 | /* arbitrary limit, but we need something */ | |
7718 | if (iov.iov_len > SZ_1G) | |
7719 | goto err; | |
7720 | ||
7721 | ubuf = (unsigned long) iov.iov_base; | |
7722 | end = (ubuf + iov.iov_len + PAGE_SIZE - 1) >> PAGE_SHIFT; | |
7723 | start = ubuf >> PAGE_SHIFT; | |
7724 | nr_pages = end - start; | |
7725 | ||
2e0464d4 | 7726 | ret = io_account_mem(ctx, nr_pages, ACCT_PINNED); |
a087e2b5 BM |
7727 | if (ret) |
7728 | goto err; | |
edafccee JA |
7729 | |
7730 | ret = 0; | |
7731 | if (!pages || nr_pages > got_pages) { | |
a8c73c1a DE |
7732 | kvfree(vmas); |
7733 | kvfree(pages); | |
d4ef6475 | 7734 | pages = kvmalloc_array(nr_pages, sizeof(struct page *), |
edafccee | 7735 | GFP_KERNEL); |
d4ef6475 | 7736 | vmas = kvmalloc_array(nr_pages, |
edafccee JA |
7737 | sizeof(struct vm_area_struct *), |
7738 | GFP_KERNEL); | |
7739 | if (!pages || !vmas) { | |
7740 | ret = -ENOMEM; | |
2e0464d4 | 7741 | io_unaccount_mem(ctx, nr_pages, ACCT_PINNED); |
edafccee JA |
7742 | goto err; |
7743 | } | |
7744 | got_pages = nr_pages; | |
7745 | } | |
7746 | ||
d4ef6475 | 7747 | imu->bvec = kvmalloc_array(nr_pages, sizeof(struct bio_vec), |
edafccee JA |
7748 | GFP_KERNEL); |
7749 | ret = -ENOMEM; | |
7750 | if (!imu->bvec) { | |
2e0464d4 | 7751 | io_unaccount_mem(ctx, nr_pages, ACCT_PINNED); |
edafccee JA |
7752 | goto err; |
7753 | } | |
7754 | ||
7755 | ret = 0; | |
d8ed45c5 | 7756 | mmap_read_lock(current->mm); |
2113b05d | 7757 | pret = pin_user_pages(ubuf, nr_pages, |
932f4a63 IW |
7758 | FOLL_WRITE | FOLL_LONGTERM, |
7759 | pages, vmas); | |
edafccee JA |
7760 | if (pret == nr_pages) { |
7761 | /* don't support file backed memory */ | |
7762 | for (j = 0; j < nr_pages; j++) { | |
7763 | struct vm_area_struct *vma = vmas[j]; | |
7764 | ||
7765 | if (vma->vm_file && | |
7766 | !is_file_hugepages(vma->vm_file)) { | |
7767 | ret = -EOPNOTSUPP; | |
7768 | break; | |
7769 | } | |
7770 | } | |
7771 | } else { | |
7772 | ret = pret < 0 ? pret : -EFAULT; | |
7773 | } | |
d8ed45c5 | 7774 | mmap_read_unlock(current->mm); |
edafccee JA |
7775 | if (ret) { |
7776 | /* | |
7777 | * if we did partial map, or found file backed vmas, | |
7778 | * release any pages we did get | |
7779 | */ | |
27c4d3a3 | 7780 | if (pret > 0) |
f1f6a7dd | 7781 | unpin_user_pages(pages, pret); |
2e0464d4 | 7782 | io_unaccount_mem(ctx, nr_pages, ACCT_PINNED); |
d4ef6475 | 7783 | kvfree(imu->bvec); |
edafccee JA |
7784 | goto err; |
7785 | } | |
7786 | ||
7787 | off = ubuf & ~PAGE_MASK; | |
7788 | size = iov.iov_len; | |
7789 | for (j = 0; j < nr_pages; j++) { | |
7790 | size_t vec_len; | |
7791 | ||
7792 | vec_len = min_t(size_t, size, PAGE_SIZE - off); | |
7793 | imu->bvec[j].bv_page = pages[j]; | |
7794 | imu->bvec[j].bv_len = vec_len; | |
7795 | imu->bvec[j].bv_offset = off; | |
7796 | off = 0; | |
7797 | size -= vec_len; | |
7798 | } | |
7799 | /* store original address for later verification */ | |
7800 | imu->ubuf = ubuf; | |
7801 | imu->len = iov.iov_len; | |
7802 | imu->nr_bvecs = nr_pages; | |
7803 | ||
7804 | ctx->nr_user_bufs++; | |
7805 | } | |
d4ef6475 MR |
7806 | kvfree(pages); |
7807 | kvfree(vmas); | |
edafccee JA |
7808 | return 0; |
7809 | err: | |
d4ef6475 MR |
7810 | kvfree(pages); |
7811 | kvfree(vmas); | |
edafccee JA |
7812 | io_sqe_buffer_unregister(ctx); |
7813 | return ret; | |
7814 | } | |
7815 | ||
9b402849 JA |
7816 | static int io_eventfd_register(struct io_ring_ctx *ctx, void __user *arg) |
7817 | { | |
7818 | __s32 __user *fds = arg; | |
7819 | int fd; | |
7820 | ||
7821 | if (ctx->cq_ev_fd) | |
7822 | return -EBUSY; | |
7823 | ||
7824 | if (copy_from_user(&fd, fds, sizeof(*fds))) | |
7825 | return -EFAULT; | |
7826 | ||
7827 | ctx->cq_ev_fd = eventfd_ctx_fdget(fd); | |
7828 | if (IS_ERR(ctx->cq_ev_fd)) { | |
7829 | int ret = PTR_ERR(ctx->cq_ev_fd); | |
7830 | ctx->cq_ev_fd = NULL; | |
7831 | return ret; | |
7832 | } | |
7833 | ||
7834 | return 0; | |
7835 | } | |
7836 | ||
7837 | static int io_eventfd_unregister(struct io_ring_ctx *ctx) | |
7838 | { | |
7839 | if (ctx->cq_ev_fd) { | |
7840 | eventfd_ctx_put(ctx->cq_ev_fd); | |
7841 | ctx->cq_ev_fd = NULL; | |
7842 | return 0; | |
7843 | } | |
7844 | ||
7845 | return -ENXIO; | |
7846 | } | |
7847 | ||
5a2e745d JA |
7848 | static int __io_destroy_buffers(int id, void *p, void *data) |
7849 | { | |
7850 | struct io_ring_ctx *ctx = data; | |
7851 | struct io_buffer *buf = p; | |
7852 | ||
067524e9 | 7853 | __io_remove_buffers(ctx, buf, id, -1U); |
5a2e745d JA |
7854 | return 0; |
7855 | } | |
7856 | ||
7857 | static void io_destroy_buffers(struct io_ring_ctx *ctx) | |
7858 | { | |
7859 | idr_for_each(&ctx->io_buffer_idr, __io_destroy_buffers, ctx); | |
7860 | idr_destroy(&ctx->io_buffer_idr); | |
7861 | } | |
7862 | ||
2b188cc1 JA |
7863 | static void io_ring_ctx_free(struct io_ring_ctx *ctx) |
7864 | { | |
6b06314c | 7865 | io_finish_async(ctx); |
5dbcad51 | 7866 | io_sqe_buffer_unregister(ctx); |
30975825 | 7867 | if (ctx->sqo_mm) { |
2b188cc1 | 7868 | mmdrop(ctx->sqo_mm); |
30975825 BM |
7869 | ctx->sqo_mm = NULL; |
7870 | } | |
def596e9 | 7871 | |
6b06314c | 7872 | io_sqe_files_unregister(ctx); |
9b402849 | 7873 | io_eventfd_unregister(ctx); |
5a2e745d | 7874 | io_destroy_buffers(ctx); |
41726c9a | 7875 | idr_destroy(&ctx->personality_idr); |
def596e9 | 7876 | |
2b188cc1 | 7877 | #if defined(CONFIG_UNIX) |
355e8d26 EB |
7878 | if (ctx->ring_sock) { |
7879 | ctx->ring_sock->file = NULL; /* so that iput() is called */ | |
2b188cc1 | 7880 | sock_release(ctx->ring_sock); |
355e8d26 | 7881 | } |
2b188cc1 JA |
7882 | #endif |
7883 | ||
75b28aff | 7884 | io_mem_free(ctx->rings); |
2b188cc1 | 7885 | io_mem_free(ctx->sq_sqes); |
2b188cc1 JA |
7886 | |
7887 | percpu_ref_exit(&ctx->refs); | |
2b188cc1 | 7888 | free_uid(ctx->user); |
181e448d | 7889 | put_cred(ctx->creds); |
78076bb6 | 7890 | kfree(ctx->cancel_hash); |
0ddf92e8 | 7891 | kmem_cache_free(req_cachep, ctx->fallback_req); |
2b188cc1 JA |
7892 | kfree(ctx); |
7893 | } | |
7894 | ||
7895 | static __poll_t io_uring_poll(struct file *file, poll_table *wait) | |
7896 | { | |
7897 | struct io_ring_ctx *ctx = file->private_data; | |
7898 | __poll_t mask = 0; | |
7899 | ||
7900 | poll_wait(file, &ctx->cq_wait, wait); | |
4f7067c3 SB |
7901 | /* |
7902 | * synchronizes with barrier from wq_has_sleeper call in | |
7903 | * io_commit_cqring | |
7904 | */ | |
2b188cc1 | 7905 | smp_rmb(); |
75b28aff HV |
7906 | if (READ_ONCE(ctx->rings->sq.tail) - ctx->cached_sq_head != |
7907 | ctx->rings->sq_ring_entries) | |
2b188cc1 | 7908 | mask |= EPOLLOUT | EPOLLWRNORM; |
63e5d81f | 7909 | if (io_cqring_events(ctx, false)) |
2b188cc1 JA |
7910 | mask |= EPOLLIN | EPOLLRDNORM; |
7911 | ||
7912 | return mask; | |
7913 | } | |
7914 | ||
7915 | static int io_uring_fasync(int fd, struct file *file, int on) | |
7916 | { | |
7917 | struct io_ring_ctx *ctx = file->private_data; | |
7918 | ||
7919 | return fasync_helper(fd, file, on, &ctx->cq_fasync); | |
7920 | } | |
7921 | ||
071698e1 JA |
7922 | static int io_remove_personalities(int id, void *p, void *data) |
7923 | { | |
7924 | struct io_ring_ctx *ctx = data; | |
7925 | const struct cred *cred; | |
7926 | ||
7927 | cred = idr_remove(&ctx->personality_idr, id); | |
7928 | if (cred) | |
7929 | put_cred(cred); | |
7930 | return 0; | |
7931 | } | |
7932 | ||
85faa7b8 JA |
7933 | static void io_ring_exit_work(struct work_struct *work) |
7934 | { | |
b2edc0a7 PB |
7935 | struct io_ring_ctx *ctx = container_of(work, struct io_ring_ctx, |
7936 | exit_work); | |
85faa7b8 | 7937 | |
56952e91 JA |
7938 | /* |
7939 | * If we're doing polled IO and end up having requests being | |
7940 | * submitted async (out-of-line), then completions can come in while | |
7941 | * we're waiting for refs to drop. We need to reap these manually, | |
7942 | * as nobody else will be looking for them. | |
7943 | */ | |
b2edc0a7 | 7944 | do { |
56952e91 JA |
7945 | if (ctx->rings) |
7946 | io_cqring_overflow_flush(ctx, true); | |
b2edc0a7 PB |
7947 | io_iopoll_try_reap_events(ctx); |
7948 | } while (!wait_for_completion_timeout(&ctx->ref_comp, HZ/20)); | |
85faa7b8 JA |
7949 | io_ring_ctx_free(ctx); |
7950 | } | |
7951 | ||
2b188cc1 JA |
7952 | static void io_ring_ctx_wait_and_kill(struct io_ring_ctx *ctx) |
7953 | { | |
7954 | mutex_lock(&ctx->uring_lock); | |
7955 | percpu_ref_kill(&ctx->refs); | |
7956 | mutex_unlock(&ctx->uring_lock); | |
7957 | ||
5262f567 | 7958 | io_kill_timeouts(ctx); |
221c5eb2 | 7959 | io_poll_remove_all(ctx); |
561fb04a JA |
7960 | |
7961 | if (ctx->io_wq) | |
7962 | io_wq_cancel_all(ctx->io_wq); | |
7963 | ||
15dff286 JA |
7964 | /* if we failed setting up the ctx, we might not have any rings */ |
7965 | if (ctx->rings) | |
7966 | io_cqring_overflow_flush(ctx, true); | |
b2edc0a7 | 7967 | io_iopoll_try_reap_events(ctx); |
071698e1 | 7968 | idr_for_each(&ctx->personality_idr, io_remove_personalities, ctx); |
309fc03a JA |
7969 | |
7970 | /* | |
7971 | * Do this upfront, so we won't have a grace period where the ring | |
7972 | * is closed but resources aren't reaped yet. This can cause | |
7973 | * spurious failure in setting up a new ring. | |
7974 | */ | |
760618f7 JA |
7975 | io_unaccount_mem(ctx, ring_pages(ctx->sq_entries, ctx->cq_entries), |
7976 | ACCT_LOCKED); | |
309fc03a | 7977 | |
85faa7b8 JA |
7978 | INIT_WORK(&ctx->exit_work, io_ring_exit_work); |
7979 | queue_work(system_wq, &ctx->exit_work); | |
2b188cc1 JA |
7980 | } |
7981 | ||
7982 | static int io_uring_release(struct inode *inode, struct file *file) | |
7983 | { | |
7984 | struct io_ring_ctx *ctx = file->private_data; | |
7985 | ||
7986 | file->private_data = NULL; | |
7987 | io_ring_ctx_wait_and_kill(ctx); | |
7988 | return 0; | |
7989 | } | |
7990 | ||
67c4d9e6 PB |
7991 | static bool io_wq_files_match(struct io_wq_work *work, void *data) |
7992 | { | |
7993 | struct files_struct *files = data; | |
7994 | ||
7995 | return work->files == files; | |
7996 | } | |
7997 | ||
f254ac04 JA |
7998 | /* |
7999 | * Returns true if 'preq' is the link parent of 'req' | |
8000 | */ | |
8001 | static bool io_match_link(struct io_kiocb *preq, struct io_kiocb *req) | |
8002 | { | |
8003 | struct io_kiocb *link; | |
8004 | ||
8005 | if (!(preq->flags & REQ_F_LINK_HEAD)) | |
8006 | return false; | |
8007 | ||
8008 | list_for_each_entry(link, &preq->link_list, link_list) { | |
8009 | if (link == req) | |
8010 | return true; | |
8011 | } | |
8012 | ||
8013 | return false; | |
8014 | } | |
8015 | ||
8016 | /* | |
8017 | * We're looking to cancel 'req' because it's holding on to our files, but | |
8018 | * 'req' could be a link to another request. See if it is, and cancel that | |
8019 | * parent request if so. | |
8020 | */ | |
8021 | static bool io_poll_remove_link(struct io_ring_ctx *ctx, struct io_kiocb *req) | |
8022 | { | |
8023 | struct hlist_node *tmp; | |
8024 | struct io_kiocb *preq; | |
8025 | bool found = false; | |
8026 | int i; | |
8027 | ||
8028 | spin_lock_irq(&ctx->completion_lock); | |
8029 | for (i = 0; i < (1U << ctx->cancel_hash_bits); i++) { | |
8030 | struct hlist_head *list; | |
8031 | ||
8032 | list = &ctx->cancel_hash[i]; | |
8033 | hlist_for_each_entry_safe(preq, tmp, list, hash_node) { | |
8034 | found = io_match_link(preq, req); | |
8035 | if (found) { | |
8036 | io_poll_remove_one(preq); | |
8037 | break; | |
8038 | } | |
8039 | } | |
8040 | } | |
8041 | spin_unlock_irq(&ctx->completion_lock); | |
8042 | return found; | |
8043 | } | |
8044 | ||
8045 | static bool io_timeout_remove_link(struct io_ring_ctx *ctx, | |
8046 | struct io_kiocb *req) | |
8047 | { | |
8048 | struct io_kiocb *preq; | |
8049 | bool found = false; | |
8050 | ||
8051 | spin_lock_irq(&ctx->completion_lock); | |
8052 | list_for_each_entry(preq, &ctx->timeout_list, timeout.list) { | |
8053 | found = io_match_link(preq, req); | |
8054 | if (found) { | |
8055 | __io_timeout_cancel(preq); | |
8056 | break; | |
8057 | } | |
8058 | } | |
8059 | spin_unlock_irq(&ctx->completion_lock); | |
8060 | return found; | |
8061 | } | |
8062 | ||
fcb323cc JA |
8063 | static void io_uring_cancel_files(struct io_ring_ctx *ctx, |
8064 | struct files_struct *files) | |
8065 | { | |
67c4d9e6 PB |
8066 | if (list_empty_careful(&ctx->inflight_list)) |
8067 | return; | |
8068 | ||
8069 | /* cancel all at once, should be faster than doing it one by one*/ | |
8070 | io_wq_cancel_cb(ctx->io_wq, io_wq_files_match, files, true); | |
8071 | ||
fcb323cc | 8072 | while (!list_empty_careful(&ctx->inflight_list)) { |
d8f1b971 XW |
8073 | struct io_kiocb *cancel_req = NULL, *req; |
8074 | DEFINE_WAIT(wait); | |
fcb323cc JA |
8075 | |
8076 | spin_lock_irq(&ctx->inflight_lock); | |
8077 | list_for_each_entry(req, &ctx->inflight_list, inflight_entry) { | |
768134d4 JA |
8078 | if (req->work.files != files) |
8079 | continue; | |
8080 | /* req is being completed, ignore */ | |
8081 | if (!refcount_inc_not_zero(&req->refs)) | |
8082 | continue; | |
8083 | cancel_req = req; | |
8084 | break; | |
fcb323cc | 8085 | } |
768134d4 | 8086 | if (cancel_req) |
fcb323cc | 8087 | prepare_to_wait(&ctx->inflight_wait, &wait, |
768134d4 | 8088 | TASK_UNINTERRUPTIBLE); |
fcb323cc JA |
8089 | spin_unlock_irq(&ctx->inflight_lock); |
8090 | ||
768134d4 JA |
8091 | /* We need to keep going until we don't find a matching req */ |
8092 | if (!cancel_req) | |
fcb323cc | 8093 | break; |
2f6d9b9d | 8094 | |
2ca10259 JA |
8095 | if (cancel_req->flags & REQ_F_OVERFLOW) { |
8096 | spin_lock_irq(&ctx->completion_lock); | |
40d8ddd4 | 8097 | list_del(&cancel_req->compl.list); |
2ca10259 | 8098 | cancel_req->flags &= ~REQ_F_OVERFLOW; |
2ca10259 | 8099 | |
46930143 | 8100 | io_cqring_mark_overflow(ctx); |
2ca10259 JA |
8101 | WRITE_ONCE(ctx->rings->cq_overflow, |
8102 | atomic_inc_return(&ctx->cached_cq_overflow)); | |
dd9dfcdf | 8103 | io_commit_cqring(ctx); |
b2bd1cf9 | 8104 | spin_unlock_irq(&ctx->completion_lock); |
2ca10259 JA |
8105 | |
8106 | /* | |
8107 | * Put inflight ref and overflow ref. If that's | |
8108 | * all we had, then we're done with this request. | |
8109 | */ | |
8110 | if (refcount_sub_and_test(2, &cancel_req->refs)) { | |
4518a3cc | 8111 | io_free_req(cancel_req); |
d8f1b971 | 8112 | finish_wait(&ctx->inflight_wait, &wait); |
2ca10259 JA |
8113 | continue; |
8114 | } | |
7b53d598 PB |
8115 | } else { |
8116 | io_wq_cancel_work(ctx->io_wq, &cancel_req->work); | |
f254ac04 JA |
8117 | /* could be a link, check and remove if it is */ |
8118 | if (!io_poll_remove_link(ctx, cancel_req)) | |
8119 | io_timeout_remove_link(ctx, cancel_req); | |
7b53d598 | 8120 | io_put_req(cancel_req); |
2ca10259 JA |
8121 | } |
8122 | ||
fcb323cc | 8123 | schedule(); |
d8f1b971 | 8124 | finish_wait(&ctx->inflight_wait, &wait); |
fcb323cc JA |
8125 | } |
8126 | } | |
8127 | ||
801dd57b | 8128 | static bool io_cancel_task_cb(struct io_wq_work *work, void *data) |
44e728b8 | 8129 | { |
801dd57b PB |
8130 | struct io_kiocb *req = container_of(work, struct io_kiocb, work); |
8131 | struct task_struct *task = data; | |
44e728b8 | 8132 | |
801dd57b | 8133 | return req->task == task; |
44e728b8 PB |
8134 | } |
8135 | ||
fcb323cc JA |
8136 | static int io_uring_flush(struct file *file, void *data) |
8137 | { | |
8138 | struct io_ring_ctx *ctx = file->private_data; | |
8139 | ||
8140 | io_uring_cancel_files(ctx, data); | |
6ab23144 JA |
8141 | |
8142 | /* | |
8143 | * If the task is going away, cancel work it may have pending | |
8144 | */ | |
801dd57b PB |
8145 | if (fatal_signal_pending(current) || (current->flags & PF_EXITING)) |
8146 | io_wq_cancel_cb(ctx->io_wq, io_cancel_task_cb, current, true); | |
6ab23144 | 8147 | |
fcb323cc JA |
8148 | return 0; |
8149 | } | |
8150 | ||
6c5c240e RP |
8151 | static void *io_uring_validate_mmap_request(struct file *file, |
8152 | loff_t pgoff, size_t sz) | |
2b188cc1 | 8153 | { |
2b188cc1 | 8154 | struct io_ring_ctx *ctx = file->private_data; |
6c5c240e | 8155 | loff_t offset = pgoff << PAGE_SHIFT; |
2b188cc1 JA |
8156 | struct page *page; |
8157 | void *ptr; | |
8158 | ||
8159 | switch (offset) { | |
8160 | case IORING_OFF_SQ_RING: | |
75b28aff HV |
8161 | case IORING_OFF_CQ_RING: |
8162 | ptr = ctx->rings; | |
2b188cc1 JA |
8163 | break; |
8164 | case IORING_OFF_SQES: | |
8165 | ptr = ctx->sq_sqes; | |
8166 | break; | |
2b188cc1 | 8167 | default: |
6c5c240e | 8168 | return ERR_PTR(-EINVAL); |
2b188cc1 JA |
8169 | } |
8170 | ||
8171 | page = virt_to_head_page(ptr); | |
a50b854e | 8172 | if (sz > page_size(page)) |
6c5c240e RP |
8173 | return ERR_PTR(-EINVAL); |
8174 | ||
8175 | return ptr; | |
8176 | } | |
8177 | ||
8178 | #ifdef CONFIG_MMU | |
8179 | ||
8180 | static int io_uring_mmap(struct file *file, struct vm_area_struct *vma) | |
8181 | { | |
8182 | size_t sz = vma->vm_end - vma->vm_start; | |
8183 | unsigned long pfn; | |
8184 | void *ptr; | |
8185 | ||
8186 | ptr = io_uring_validate_mmap_request(file, vma->vm_pgoff, sz); | |
8187 | if (IS_ERR(ptr)) | |
8188 | return PTR_ERR(ptr); | |
2b188cc1 JA |
8189 | |
8190 | pfn = virt_to_phys(ptr) >> PAGE_SHIFT; | |
8191 | return remap_pfn_range(vma, vma->vm_start, pfn, sz, vma->vm_page_prot); | |
8192 | } | |
8193 | ||
6c5c240e RP |
8194 | #else /* !CONFIG_MMU */ |
8195 | ||
8196 | static int io_uring_mmap(struct file *file, struct vm_area_struct *vma) | |
8197 | { | |
8198 | return vma->vm_flags & (VM_SHARED | VM_MAYSHARE) ? 0 : -EINVAL; | |
8199 | } | |
8200 | ||
8201 | static unsigned int io_uring_nommu_mmap_capabilities(struct file *file) | |
8202 | { | |
8203 | return NOMMU_MAP_DIRECT | NOMMU_MAP_READ | NOMMU_MAP_WRITE; | |
8204 | } | |
8205 | ||
8206 | static unsigned long io_uring_nommu_get_unmapped_area(struct file *file, | |
8207 | unsigned long addr, unsigned long len, | |
8208 | unsigned long pgoff, unsigned long flags) | |
8209 | { | |
8210 | void *ptr; | |
8211 | ||
8212 | ptr = io_uring_validate_mmap_request(file, pgoff, len); | |
8213 | if (IS_ERR(ptr)) | |
8214 | return PTR_ERR(ptr); | |
8215 | ||
8216 | return (unsigned long) ptr; | |
8217 | } | |
8218 | ||
8219 | #endif /* !CONFIG_MMU */ | |
8220 | ||
2b188cc1 JA |
8221 | SYSCALL_DEFINE6(io_uring_enter, unsigned int, fd, u32, to_submit, |
8222 | u32, min_complete, u32, flags, const sigset_t __user *, sig, | |
8223 | size_t, sigsz) | |
8224 | { | |
8225 | struct io_ring_ctx *ctx; | |
8226 | long ret = -EBADF; | |
8227 | int submitted = 0; | |
8228 | struct fd f; | |
8229 | ||
4c6e277c | 8230 | io_run_task_work(); |
b41e9852 | 8231 | |
6c271ce2 | 8232 | if (flags & ~(IORING_ENTER_GETEVENTS | IORING_ENTER_SQ_WAKEUP)) |
2b188cc1 JA |
8233 | return -EINVAL; |
8234 | ||
8235 | f = fdget(fd); | |
8236 | if (!f.file) | |
8237 | return -EBADF; | |
8238 | ||
8239 | ret = -EOPNOTSUPP; | |
8240 | if (f.file->f_op != &io_uring_fops) | |
8241 | goto out_fput; | |
8242 | ||
8243 | ret = -ENXIO; | |
8244 | ctx = f.file->private_data; | |
8245 | if (!percpu_ref_tryget(&ctx->refs)) | |
8246 | goto out_fput; | |
8247 | ||
6c271ce2 JA |
8248 | /* |
8249 | * For SQ polling, the thread will do all submissions and completions. | |
8250 | * Just return the requested submit count, and wake the thread if | |
8251 | * we were asked to. | |
8252 | */ | |
b2a9eada | 8253 | ret = 0; |
6c271ce2 | 8254 | if (ctx->flags & IORING_SETUP_SQPOLL) { |
c1edbf5f JA |
8255 | if (!list_empty_careful(&ctx->cq_overflow_list)) |
8256 | io_cqring_overflow_flush(ctx, false); | |
6c271ce2 JA |
8257 | if (flags & IORING_ENTER_SQ_WAKEUP) |
8258 | wake_up(&ctx->sqo_wait); | |
8259 | submitted = to_submit; | |
b2a9eada | 8260 | } else if (to_submit) { |
2b188cc1 | 8261 | mutex_lock(&ctx->uring_lock); |
0cdaf760 | 8262 | submitted = io_submit_sqes(ctx, to_submit, f.file, fd); |
2b188cc1 | 8263 | mutex_unlock(&ctx->uring_lock); |
7c504e65 PB |
8264 | |
8265 | if (submitted != to_submit) | |
8266 | goto out; | |
2b188cc1 JA |
8267 | } |
8268 | if (flags & IORING_ENTER_GETEVENTS) { | |
8269 | min_complete = min(min_complete, ctx->cq_entries); | |
8270 | ||
32b2244a XW |
8271 | /* |
8272 | * When SETUP_IOPOLL and SETUP_SQPOLL are both enabled, user | |
8273 | * space applications don't need to do io completion events | |
8274 | * polling again, they can rely on io_sq_thread to do polling | |
8275 | * work, which can reduce cpu usage and uring_lock contention. | |
8276 | */ | |
8277 | if (ctx->flags & IORING_SETUP_IOPOLL && | |
8278 | !(ctx->flags & IORING_SETUP_SQPOLL)) { | |
7668b92a | 8279 | ret = io_iopoll_check(ctx, min_complete); |
def596e9 JA |
8280 | } else { |
8281 | ret = io_cqring_wait(ctx, min_complete, sig, sigsz); | |
8282 | } | |
2b188cc1 JA |
8283 | } |
8284 | ||
7c504e65 | 8285 | out: |
6805b32e | 8286 | percpu_ref_put(&ctx->refs); |
2b188cc1 JA |
8287 | out_fput: |
8288 | fdput(f); | |
8289 | return submitted ? submitted : ret; | |
8290 | } | |
8291 | ||
bebdb65e | 8292 | #ifdef CONFIG_PROC_FS |
87ce955b JA |
8293 | static int io_uring_show_cred(int id, void *p, void *data) |
8294 | { | |
8295 | const struct cred *cred = p; | |
8296 | struct seq_file *m = data; | |
8297 | struct user_namespace *uns = seq_user_ns(m); | |
8298 | struct group_info *gi; | |
8299 | kernel_cap_t cap; | |
8300 | unsigned __capi; | |
8301 | int g; | |
8302 | ||
8303 | seq_printf(m, "%5d\n", id); | |
8304 | seq_put_decimal_ull(m, "\tUid:\t", from_kuid_munged(uns, cred->uid)); | |
8305 | seq_put_decimal_ull(m, "\t\t", from_kuid_munged(uns, cred->euid)); | |
8306 | seq_put_decimal_ull(m, "\t\t", from_kuid_munged(uns, cred->suid)); | |
8307 | seq_put_decimal_ull(m, "\t\t", from_kuid_munged(uns, cred->fsuid)); | |
8308 | seq_put_decimal_ull(m, "\n\tGid:\t", from_kgid_munged(uns, cred->gid)); | |
8309 | seq_put_decimal_ull(m, "\t\t", from_kgid_munged(uns, cred->egid)); | |
8310 | seq_put_decimal_ull(m, "\t\t", from_kgid_munged(uns, cred->sgid)); | |
8311 | seq_put_decimal_ull(m, "\t\t", from_kgid_munged(uns, cred->fsgid)); | |
8312 | seq_puts(m, "\n\tGroups:\t"); | |
8313 | gi = cred->group_info; | |
8314 | for (g = 0; g < gi->ngroups; g++) { | |
8315 | seq_put_decimal_ull(m, g ? " " : "", | |
8316 | from_kgid_munged(uns, gi->gid[g])); | |
8317 | } | |
8318 | seq_puts(m, "\n\tCapEff:\t"); | |
8319 | cap = cred->cap_effective; | |
8320 | CAP_FOR_EACH_U32(__capi) | |
8321 | seq_put_hex_ll(m, NULL, cap.cap[CAP_LAST_U32 - __capi], 8); | |
8322 | seq_putc(m, '\n'); | |
8323 | return 0; | |
8324 | } | |
8325 | ||
8326 | static void __io_uring_show_fdinfo(struct io_ring_ctx *ctx, struct seq_file *m) | |
8327 | { | |
8328 | int i; | |
8329 | ||
8330 | mutex_lock(&ctx->uring_lock); | |
8331 | seq_printf(m, "UserFiles:\t%u\n", ctx->nr_user_files); | |
8332 | for (i = 0; i < ctx->nr_user_files; i++) { | |
8333 | struct fixed_file_table *table; | |
8334 | struct file *f; | |
8335 | ||
8336 | table = &ctx->file_data->table[i >> IORING_FILE_TABLE_SHIFT]; | |
8337 | f = table->files[i & IORING_FILE_TABLE_MASK]; | |
8338 | if (f) | |
8339 | seq_printf(m, "%5u: %s\n", i, file_dentry(f)->d_iname); | |
8340 | else | |
8341 | seq_printf(m, "%5u: <none>\n", i); | |
8342 | } | |
8343 | seq_printf(m, "UserBufs:\t%u\n", ctx->nr_user_bufs); | |
8344 | for (i = 0; i < ctx->nr_user_bufs; i++) { | |
8345 | struct io_mapped_ubuf *buf = &ctx->user_bufs[i]; | |
8346 | ||
8347 | seq_printf(m, "%5u: 0x%llx/%u\n", i, buf->ubuf, | |
8348 | (unsigned int) buf->len); | |
8349 | } | |
8350 | if (!idr_is_empty(&ctx->personality_idr)) { | |
8351 | seq_printf(m, "Personalities:\n"); | |
8352 | idr_for_each(&ctx->personality_idr, io_uring_show_cred, m); | |
8353 | } | |
d7718a9d JA |
8354 | seq_printf(m, "PollList:\n"); |
8355 | spin_lock_irq(&ctx->completion_lock); | |
8356 | for (i = 0; i < (1U << ctx->cancel_hash_bits); i++) { | |
8357 | struct hlist_head *list = &ctx->cancel_hash[i]; | |
8358 | struct io_kiocb *req; | |
8359 | ||
8360 | hlist_for_each_entry(req, list, hash_node) | |
8361 | seq_printf(m, " op=%d, task_works=%d\n", req->opcode, | |
8362 | req->task->task_works != NULL); | |
8363 | } | |
8364 | spin_unlock_irq(&ctx->completion_lock); | |
87ce955b JA |
8365 | mutex_unlock(&ctx->uring_lock); |
8366 | } | |
8367 | ||
8368 | static void io_uring_show_fdinfo(struct seq_file *m, struct file *f) | |
8369 | { | |
8370 | struct io_ring_ctx *ctx = f->private_data; | |
8371 | ||
8372 | if (percpu_ref_tryget(&ctx->refs)) { | |
8373 | __io_uring_show_fdinfo(ctx, m); | |
8374 | percpu_ref_put(&ctx->refs); | |
8375 | } | |
8376 | } | |
bebdb65e | 8377 | #endif |
87ce955b | 8378 | |
2b188cc1 JA |
8379 | static const struct file_operations io_uring_fops = { |
8380 | .release = io_uring_release, | |
fcb323cc | 8381 | .flush = io_uring_flush, |
2b188cc1 | 8382 | .mmap = io_uring_mmap, |
6c5c240e RP |
8383 | #ifndef CONFIG_MMU |
8384 | .get_unmapped_area = io_uring_nommu_get_unmapped_area, | |
8385 | .mmap_capabilities = io_uring_nommu_mmap_capabilities, | |
8386 | #endif | |
2b188cc1 JA |
8387 | .poll = io_uring_poll, |
8388 | .fasync = io_uring_fasync, | |
bebdb65e | 8389 | #ifdef CONFIG_PROC_FS |
87ce955b | 8390 | .show_fdinfo = io_uring_show_fdinfo, |
bebdb65e | 8391 | #endif |
2b188cc1 JA |
8392 | }; |
8393 | ||
8394 | static int io_allocate_scq_urings(struct io_ring_ctx *ctx, | |
8395 | struct io_uring_params *p) | |
8396 | { | |
75b28aff HV |
8397 | struct io_rings *rings; |
8398 | size_t size, sq_array_offset; | |
2b188cc1 | 8399 | |
bd740481 JA |
8400 | /* make sure these are sane, as we already accounted them */ |
8401 | ctx->sq_entries = p->sq_entries; | |
8402 | ctx->cq_entries = p->cq_entries; | |
8403 | ||
75b28aff HV |
8404 | size = rings_size(p->sq_entries, p->cq_entries, &sq_array_offset); |
8405 | if (size == SIZE_MAX) | |
8406 | return -EOVERFLOW; | |
8407 | ||
8408 | rings = io_mem_alloc(size); | |
8409 | if (!rings) | |
2b188cc1 JA |
8410 | return -ENOMEM; |
8411 | ||
75b28aff HV |
8412 | ctx->rings = rings; |
8413 | ctx->sq_array = (u32 *)((char *)rings + sq_array_offset); | |
8414 | rings->sq_ring_mask = p->sq_entries - 1; | |
8415 | rings->cq_ring_mask = p->cq_entries - 1; | |
8416 | rings->sq_ring_entries = p->sq_entries; | |
8417 | rings->cq_ring_entries = p->cq_entries; | |
8418 | ctx->sq_mask = rings->sq_ring_mask; | |
8419 | ctx->cq_mask = rings->cq_ring_mask; | |
2b188cc1 JA |
8420 | |
8421 | size = array_size(sizeof(struct io_uring_sqe), p->sq_entries); | |
eb065d30 JA |
8422 | if (size == SIZE_MAX) { |
8423 | io_mem_free(ctx->rings); | |
8424 | ctx->rings = NULL; | |
2b188cc1 | 8425 | return -EOVERFLOW; |
eb065d30 | 8426 | } |
2b188cc1 JA |
8427 | |
8428 | ctx->sq_sqes = io_mem_alloc(size); | |
eb065d30 JA |
8429 | if (!ctx->sq_sqes) { |
8430 | io_mem_free(ctx->rings); | |
8431 | ctx->rings = NULL; | |
2b188cc1 | 8432 | return -ENOMEM; |
eb065d30 | 8433 | } |
2b188cc1 | 8434 | |
2b188cc1 JA |
8435 | return 0; |
8436 | } | |
8437 | ||
8438 | /* | |
8439 | * Allocate an anonymous fd, this is what constitutes the application | |
8440 | * visible backing of an io_uring instance. The application mmaps this | |
8441 | * fd to gain access to the SQ/CQ ring details. If UNIX sockets are enabled, | |
8442 | * we have to tie this fd to a socket for file garbage collection purposes. | |
8443 | */ | |
8444 | static int io_uring_get_fd(struct io_ring_ctx *ctx) | |
8445 | { | |
8446 | struct file *file; | |
8447 | int ret; | |
8448 | ||
8449 | #if defined(CONFIG_UNIX) | |
8450 | ret = sock_create_kern(&init_net, PF_UNIX, SOCK_RAW, IPPROTO_IP, | |
8451 | &ctx->ring_sock); | |
8452 | if (ret) | |
8453 | return ret; | |
8454 | #endif | |
8455 | ||
8456 | ret = get_unused_fd_flags(O_RDWR | O_CLOEXEC); | |
8457 | if (ret < 0) | |
8458 | goto err; | |
8459 | ||
8460 | file = anon_inode_getfile("[io_uring]", &io_uring_fops, ctx, | |
8461 | O_RDWR | O_CLOEXEC); | |
8462 | if (IS_ERR(file)) { | |
8463 | put_unused_fd(ret); | |
8464 | ret = PTR_ERR(file); | |
8465 | goto err; | |
8466 | } | |
8467 | ||
8468 | #if defined(CONFIG_UNIX) | |
8469 | ctx->ring_sock->file = file; | |
8470 | #endif | |
8471 | fd_install(ret, file); | |
8472 | return ret; | |
8473 | err: | |
8474 | #if defined(CONFIG_UNIX) | |
8475 | sock_release(ctx->ring_sock); | |
8476 | ctx->ring_sock = NULL; | |
8477 | #endif | |
8478 | return ret; | |
8479 | } | |
8480 | ||
7f13657d XW |
8481 | static int io_uring_create(unsigned entries, struct io_uring_params *p, |
8482 | struct io_uring_params __user *params) | |
2b188cc1 JA |
8483 | { |
8484 | struct user_struct *user = NULL; | |
8485 | struct io_ring_ctx *ctx; | |
aad5d8da | 8486 | bool limit_mem; |
2b188cc1 JA |
8487 | int ret; |
8488 | ||
8110c1a6 | 8489 | if (!entries) |
2b188cc1 | 8490 | return -EINVAL; |
8110c1a6 JA |
8491 | if (entries > IORING_MAX_ENTRIES) { |
8492 | if (!(p->flags & IORING_SETUP_CLAMP)) | |
8493 | return -EINVAL; | |
8494 | entries = IORING_MAX_ENTRIES; | |
8495 | } | |
2b188cc1 JA |
8496 | |
8497 | /* | |
8498 | * Use twice as many entries for the CQ ring. It's possible for the | |
8499 | * application to drive a higher depth than the size of the SQ ring, | |
8500 | * since the sqes are only used at submission time. This allows for | |
33a107f0 JA |
8501 | * some flexibility in overcommitting a bit. If the application has |
8502 | * set IORING_SETUP_CQSIZE, it will have passed in the desired number | |
8503 | * of CQ ring entries manually. | |
2b188cc1 JA |
8504 | */ |
8505 | p->sq_entries = roundup_pow_of_two(entries); | |
33a107f0 JA |
8506 | if (p->flags & IORING_SETUP_CQSIZE) { |
8507 | /* | |
8508 | * If IORING_SETUP_CQSIZE is set, we do the same roundup | |
8509 | * to a power-of-two, if it isn't already. We do NOT impose | |
8510 | * any cq vs sq ring sizing. | |
8511 | */ | |
8110c1a6 | 8512 | if (p->cq_entries < p->sq_entries) |
33a107f0 | 8513 | return -EINVAL; |
8110c1a6 JA |
8514 | if (p->cq_entries > IORING_MAX_CQ_ENTRIES) { |
8515 | if (!(p->flags & IORING_SETUP_CLAMP)) | |
8516 | return -EINVAL; | |
8517 | p->cq_entries = IORING_MAX_CQ_ENTRIES; | |
8518 | } | |
33a107f0 JA |
8519 | p->cq_entries = roundup_pow_of_two(p->cq_entries); |
8520 | } else { | |
8521 | p->cq_entries = 2 * p->sq_entries; | |
8522 | } | |
2b188cc1 JA |
8523 | |
8524 | user = get_uid(current_user()); | |
aad5d8da | 8525 | limit_mem = !capable(CAP_IPC_LOCK); |
2b188cc1 | 8526 | |
aad5d8da | 8527 | if (limit_mem) { |
a087e2b5 | 8528 | ret = __io_account_mem(user, |
2b188cc1 JA |
8529 | ring_pages(p->sq_entries, p->cq_entries)); |
8530 | if (ret) { | |
8531 | free_uid(user); | |
8532 | return ret; | |
8533 | } | |
8534 | } | |
8535 | ||
8536 | ctx = io_ring_ctx_alloc(p); | |
8537 | if (!ctx) { | |
aad5d8da | 8538 | if (limit_mem) |
a087e2b5 | 8539 | __io_unaccount_mem(user, ring_pages(p->sq_entries, |
2b188cc1 JA |
8540 | p->cq_entries)); |
8541 | free_uid(user); | |
8542 | return -ENOMEM; | |
8543 | } | |
8544 | ctx->compat = in_compat_syscall(); | |
2b188cc1 | 8545 | ctx->user = user; |
0b8c0ec7 | 8546 | ctx->creds = get_current_cred(); |
2b188cc1 | 8547 | |
f74441e6 JA |
8548 | /* |
8549 | * Account memory _before_ installing the file descriptor. Once | |
8550 | * the descriptor is installed, it can get closed at any time. Also | |
8551 | * do this before hitting the general error path, as ring freeing | |
8552 | * will un-account as well. | |
8553 | */ | |
8554 | io_account_mem(ctx, ring_pages(p->sq_entries, p->cq_entries), | |
8555 | ACCT_LOCKED); | |
8556 | ctx->limit_mem = limit_mem; | |
8557 | ||
2b188cc1 JA |
8558 | ret = io_allocate_scq_urings(ctx, p); |
8559 | if (ret) | |
8560 | goto err; | |
8561 | ||
6c271ce2 | 8562 | ret = io_sq_offload_start(ctx, p); |
2b188cc1 JA |
8563 | if (ret) |
8564 | goto err; | |
8565 | ||
2b188cc1 | 8566 | memset(&p->sq_off, 0, sizeof(p->sq_off)); |
75b28aff HV |
8567 | p->sq_off.head = offsetof(struct io_rings, sq.head); |
8568 | p->sq_off.tail = offsetof(struct io_rings, sq.tail); | |
8569 | p->sq_off.ring_mask = offsetof(struct io_rings, sq_ring_mask); | |
8570 | p->sq_off.ring_entries = offsetof(struct io_rings, sq_ring_entries); | |
8571 | p->sq_off.flags = offsetof(struct io_rings, sq_flags); | |
8572 | p->sq_off.dropped = offsetof(struct io_rings, sq_dropped); | |
8573 | p->sq_off.array = (char *)ctx->sq_array - (char *)ctx->rings; | |
2b188cc1 JA |
8574 | |
8575 | memset(&p->cq_off, 0, sizeof(p->cq_off)); | |
75b28aff HV |
8576 | p->cq_off.head = offsetof(struct io_rings, cq.head); |
8577 | p->cq_off.tail = offsetof(struct io_rings, cq.tail); | |
8578 | p->cq_off.ring_mask = offsetof(struct io_rings, cq_ring_mask); | |
8579 | p->cq_off.ring_entries = offsetof(struct io_rings, cq_ring_entries); | |
8580 | p->cq_off.overflow = offsetof(struct io_rings, cq_overflow); | |
8581 | p->cq_off.cqes = offsetof(struct io_rings, cqes); | |
0d9b5b3a | 8582 | p->cq_off.flags = offsetof(struct io_rings, cq_flags); |
ac90f249 | 8583 | |
7f13657d XW |
8584 | p->features = IORING_FEAT_SINGLE_MMAP | IORING_FEAT_NODROP | |
8585 | IORING_FEAT_SUBMIT_STABLE | IORING_FEAT_RW_CUR_POS | | |
5769a351 JX |
8586 | IORING_FEAT_CUR_PERSONALITY | IORING_FEAT_FAST_POLL | |
8587 | IORING_FEAT_POLL_32BITS; | |
7f13657d XW |
8588 | |
8589 | if (copy_to_user(params, p, sizeof(*p))) { | |
8590 | ret = -EFAULT; | |
8591 | goto err; | |
8592 | } | |
d1719f70 | 8593 | |
044c1ab3 JA |
8594 | /* |
8595 | * Install ring fd as the very last thing, so we don't risk someone | |
8596 | * having closed it before we finish setup | |
8597 | */ | |
8598 | ret = io_uring_get_fd(ctx); | |
8599 | if (ret < 0) | |
8600 | goto err; | |
8601 | ||
c826bd7a | 8602 | trace_io_uring_create(ret, ctx, p->sq_entries, p->cq_entries, p->flags); |
2b188cc1 JA |
8603 | return ret; |
8604 | err: | |
8605 | io_ring_ctx_wait_and_kill(ctx); | |
8606 | return ret; | |
8607 | } | |
8608 | ||
8609 | /* | |
8610 | * Sets up an aio uring context, and returns the fd. Applications asks for a | |
8611 | * ring size, we return the actual sq/cq ring sizes (among other things) in the | |
8612 | * params structure passed in. | |
8613 | */ | |
8614 | static long io_uring_setup(u32 entries, struct io_uring_params __user *params) | |
8615 | { | |
8616 | struct io_uring_params p; | |
2b188cc1 JA |
8617 | int i; |
8618 | ||
8619 | if (copy_from_user(&p, params, sizeof(p))) | |
8620 | return -EFAULT; | |
8621 | for (i = 0; i < ARRAY_SIZE(p.resv); i++) { | |
8622 | if (p.resv[i]) | |
8623 | return -EINVAL; | |
8624 | } | |
8625 | ||
6c271ce2 | 8626 | if (p.flags & ~(IORING_SETUP_IOPOLL | IORING_SETUP_SQPOLL | |
8110c1a6 | 8627 | IORING_SETUP_SQ_AFF | IORING_SETUP_CQSIZE | |
24369c2e | 8628 | IORING_SETUP_CLAMP | IORING_SETUP_ATTACH_WQ)) |
2b188cc1 JA |
8629 | return -EINVAL; |
8630 | ||
7f13657d | 8631 | return io_uring_create(entries, &p, params); |
2b188cc1 JA |
8632 | } |
8633 | ||
8634 | SYSCALL_DEFINE2(io_uring_setup, u32, entries, | |
8635 | struct io_uring_params __user *, params) | |
8636 | { | |
8637 | return io_uring_setup(entries, params); | |
8638 | } | |
8639 | ||
66f4af93 JA |
8640 | static int io_probe(struct io_ring_ctx *ctx, void __user *arg, unsigned nr_args) |
8641 | { | |
8642 | struct io_uring_probe *p; | |
8643 | size_t size; | |
8644 | int i, ret; | |
8645 | ||
8646 | size = struct_size(p, ops, nr_args); | |
8647 | if (size == SIZE_MAX) | |
8648 | return -EOVERFLOW; | |
8649 | p = kzalloc(size, GFP_KERNEL); | |
8650 | if (!p) | |
8651 | return -ENOMEM; | |
8652 | ||
8653 | ret = -EFAULT; | |
8654 | if (copy_from_user(p, arg, size)) | |
8655 | goto out; | |
8656 | ret = -EINVAL; | |
8657 | if (memchr_inv(p, 0, size)) | |
8658 | goto out; | |
8659 | ||
8660 | p->last_op = IORING_OP_LAST - 1; | |
8661 | if (nr_args > IORING_OP_LAST) | |
8662 | nr_args = IORING_OP_LAST; | |
8663 | ||
8664 | for (i = 0; i < nr_args; i++) { | |
8665 | p->ops[i].op = i; | |
8666 | if (!io_op_defs[i].not_supported) | |
8667 | p->ops[i].flags = IO_URING_OP_SUPPORTED; | |
8668 | } | |
8669 | p->ops_len = i; | |
8670 | ||
8671 | ret = 0; | |
8672 | if (copy_to_user(arg, p, size)) | |
8673 | ret = -EFAULT; | |
8674 | out: | |
8675 | kfree(p); | |
8676 | return ret; | |
8677 | } | |
8678 | ||
071698e1 JA |
8679 | static int io_register_personality(struct io_ring_ctx *ctx) |
8680 | { | |
8681 | const struct cred *creds = get_current_cred(); | |
8682 | int id; | |
8683 | ||
8684 | id = idr_alloc_cyclic(&ctx->personality_idr, (void *) creds, 1, | |
8685 | USHRT_MAX, GFP_KERNEL); | |
8686 | if (id < 0) | |
8687 | put_cred(creds); | |
8688 | return id; | |
8689 | } | |
8690 | ||
8691 | static int io_unregister_personality(struct io_ring_ctx *ctx, unsigned id) | |
8692 | { | |
8693 | const struct cred *old_creds; | |
8694 | ||
8695 | old_creds = idr_remove(&ctx->personality_idr, id); | |
8696 | if (old_creds) { | |
8697 | put_cred(old_creds); | |
8698 | return 0; | |
8699 | } | |
8700 | ||
8701 | return -EINVAL; | |
8702 | } | |
8703 | ||
8704 | static bool io_register_op_must_quiesce(int op) | |
8705 | { | |
8706 | switch (op) { | |
8707 | case IORING_UNREGISTER_FILES: | |
8708 | case IORING_REGISTER_FILES_UPDATE: | |
8709 | case IORING_REGISTER_PROBE: | |
8710 | case IORING_REGISTER_PERSONALITY: | |
8711 | case IORING_UNREGISTER_PERSONALITY: | |
8712 | return false; | |
8713 | default: | |
8714 | return true; | |
8715 | } | |
8716 | } | |
8717 | ||
edafccee JA |
8718 | static int __io_uring_register(struct io_ring_ctx *ctx, unsigned opcode, |
8719 | void __user *arg, unsigned nr_args) | |
b19062a5 JA |
8720 | __releases(ctx->uring_lock) |
8721 | __acquires(ctx->uring_lock) | |
edafccee JA |
8722 | { |
8723 | int ret; | |
8724 | ||
35fa71a0 JA |
8725 | /* |
8726 | * We're inside the ring mutex, if the ref is already dying, then | |
8727 | * someone else killed the ctx or is already going through | |
8728 | * io_uring_register(). | |
8729 | */ | |
8730 | if (percpu_ref_is_dying(&ctx->refs)) | |
8731 | return -ENXIO; | |
8732 | ||
071698e1 | 8733 | if (io_register_op_must_quiesce(opcode)) { |
05f3fb3c | 8734 | percpu_ref_kill(&ctx->refs); |
b19062a5 | 8735 | |
05f3fb3c JA |
8736 | /* |
8737 | * Drop uring mutex before waiting for references to exit. If | |
8738 | * another thread is currently inside io_uring_enter() it might | |
8739 | * need to grab the uring_lock to make progress. If we hold it | |
8740 | * here across the drain wait, then we can deadlock. It's safe | |
8741 | * to drop the mutex here, since no new references will come in | |
8742 | * after we've killed the percpu ref. | |
8743 | */ | |
8744 | mutex_unlock(&ctx->uring_lock); | |
0f158b4c | 8745 | ret = wait_for_completion_interruptible(&ctx->ref_comp); |
05f3fb3c | 8746 | mutex_lock(&ctx->uring_lock); |
c150368b JA |
8747 | if (ret) { |
8748 | percpu_ref_resurrect(&ctx->refs); | |
8749 | ret = -EINTR; | |
8750 | goto out; | |
8751 | } | |
05f3fb3c | 8752 | } |
edafccee JA |
8753 | |
8754 | switch (opcode) { | |
8755 | case IORING_REGISTER_BUFFERS: | |
8756 | ret = io_sqe_buffer_register(ctx, arg, nr_args); | |
8757 | break; | |
8758 | case IORING_UNREGISTER_BUFFERS: | |
8759 | ret = -EINVAL; | |
8760 | if (arg || nr_args) | |
8761 | break; | |
8762 | ret = io_sqe_buffer_unregister(ctx); | |
8763 | break; | |
6b06314c JA |
8764 | case IORING_REGISTER_FILES: |
8765 | ret = io_sqe_files_register(ctx, arg, nr_args); | |
8766 | break; | |
8767 | case IORING_UNREGISTER_FILES: | |
8768 | ret = -EINVAL; | |
8769 | if (arg || nr_args) | |
8770 | break; | |
8771 | ret = io_sqe_files_unregister(ctx); | |
8772 | break; | |
c3a31e60 JA |
8773 | case IORING_REGISTER_FILES_UPDATE: |
8774 | ret = io_sqe_files_update(ctx, arg, nr_args); | |
8775 | break; | |
9b402849 | 8776 | case IORING_REGISTER_EVENTFD: |
f2842ab5 | 8777 | case IORING_REGISTER_EVENTFD_ASYNC: |
9b402849 JA |
8778 | ret = -EINVAL; |
8779 | if (nr_args != 1) | |
8780 | break; | |
8781 | ret = io_eventfd_register(ctx, arg); | |
f2842ab5 JA |
8782 | if (ret) |
8783 | break; | |
8784 | if (opcode == IORING_REGISTER_EVENTFD_ASYNC) | |
8785 | ctx->eventfd_async = 1; | |
8786 | else | |
8787 | ctx->eventfd_async = 0; | |
9b402849 JA |
8788 | break; |
8789 | case IORING_UNREGISTER_EVENTFD: | |
8790 | ret = -EINVAL; | |
8791 | if (arg || nr_args) | |
8792 | break; | |
8793 | ret = io_eventfd_unregister(ctx); | |
8794 | break; | |
66f4af93 JA |
8795 | case IORING_REGISTER_PROBE: |
8796 | ret = -EINVAL; | |
8797 | if (!arg || nr_args > 256) | |
8798 | break; | |
8799 | ret = io_probe(ctx, arg, nr_args); | |
8800 | break; | |
071698e1 JA |
8801 | case IORING_REGISTER_PERSONALITY: |
8802 | ret = -EINVAL; | |
8803 | if (arg || nr_args) | |
8804 | break; | |
8805 | ret = io_register_personality(ctx); | |
8806 | break; | |
8807 | case IORING_UNREGISTER_PERSONALITY: | |
8808 | ret = -EINVAL; | |
8809 | if (arg) | |
8810 | break; | |
8811 | ret = io_unregister_personality(ctx, nr_args); | |
8812 | break; | |
edafccee JA |
8813 | default: |
8814 | ret = -EINVAL; | |
8815 | break; | |
8816 | } | |
8817 | ||
071698e1 | 8818 | if (io_register_op_must_quiesce(opcode)) { |
05f3fb3c | 8819 | /* bring the ctx back to life */ |
05f3fb3c | 8820 | percpu_ref_reinit(&ctx->refs); |
c150368b | 8821 | out: |
0f158b4c | 8822 | reinit_completion(&ctx->ref_comp); |
05f3fb3c | 8823 | } |
edafccee JA |
8824 | return ret; |
8825 | } | |
8826 | ||
8827 | SYSCALL_DEFINE4(io_uring_register, unsigned int, fd, unsigned int, opcode, | |
8828 | void __user *, arg, unsigned int, nr_args) | |
8829 | { | |
8830 | struct io_ring_ctx *ctx; | |
8831 | long ret = -EBADF; | |
8832 | struct fd f; | |
8833 | ||
8834 | f = fdget(fd); | |
8835 | if (!f.file) | |
8836 | return -EBADF; | |
8837 | ||
8838 | ret = -EOPNOTSUPP; | |
8839 | if (f.file->f_op != &io_uring_fops) | |
8840 | goto out_fput; | |
8841 | ||
8842 | ctx = f.file->private_data; | |
8843 | ||
8844 | mutex_lock(&ctx->uring_lock); | |
8845 | ret = __io_uring_register(ctx, opcode, arg, nr_args); | |
8846 | mutex_unlock(&ctx->uring_lock); | |
c826bd7a DD |
8847 | trace_io_uring_register(ctx, opcode, ctx->nr_user_files, ctx->nr_user_bufs, |
8848 | ctx->cq_ev_fd != NULL, ret); | |
edafccee JA |
8849 | out_fput: |
8850 | fdput(f); | |
8851 | return ret; | |
8852 | } | |
8853 | ||
2b188cc1 JA |
8854 | static int __init io_uring_init(void) |
8855 | { | |
d7f62e82 SM |
8856 | #define __BUILD_BUG_VERIFY_ELEMENT(stype, eoffset, etype, ename) do { \ |
8857 | BUILD_BUG_ON(offsetof(stype, ename) != eoffset); \ | |
8858 | BUILD_BUG_ON(sizeof(etype) != sizeof_field(stype, ename)); \ | |
8859 | } while (0) | |
8860 | ||
8861 | #define BUILD_BUG_SQE_ELEM(eoffset, etype, ename) \ | |
8862 | __BUILD_BUG_VERIFY_ELEMENT(struct io_uring_sqe, eoffset, etype, ename) | |
8863 | BUILD_BUG_ON(sizeof(struct io_uring_sqe) != 64); | |
8864 | BUILD_BUG_SQE_ELEM(0, __u8, opcode); | |
8865 | BUILD_BUG_SQE_ELEM(1, __u8, flags); | |
8866 | BUILD_BUG_SQE_ELEM(2, __u16, ioprio); | |
8867 | BUILD_BUG_SQE_ELEM(4, __s32, fd); | |
8868 | BUILD_BUG_SQE_ELEM(8, __u64, off); | |
8869 | BUILD_BUG_SQE_ELEM(8, __u64, addr2); | |
8870 | BUILD_BUG_SQE_ELEM(16, __u64, addr); | |
7d67af2c | 8871 | BUILD_BUG_SQE_ELEM(16, __u64, splice_off_in); |
d7f62e82 SM |
8872 | BUILD_BUG_SQE_ELEM(24, __u32, len); |
8873 | BUILD_BUG_SQE_ELEM(28, __kernel_rwf_t, rw_flags); | |
8874 | BUILD_BUG_SQE_ELEM(28, /* compat */ int, rw_flags); | |
8875 | BUILD_BUG_SQE_ELEM(28, /* compat */ __u32, rw_flags); | |
8876 | BUILD_BUG_SQE_ELEM(28, __u32, fsync_flags); | |
5769a351 JX |
8877 | BUILD_BUG_SQE_ELEM(28, /* compat */ __u16, poll_events); |
8878 | BUILD_BUG_SQE_ELEM(28, __u32, poll32_events); | |
d7f62e82 SM |
8879 | BUILD_BUG_SQE_ELEM(28, __u32, sync_range_flags); |
8880 | BUILD_BUG_SQE_ELEM(28, __u32, msg_flags); | |
8881 | BUILD_BUG_SQE_ELEM(28, __u32, timeout_flags); | |
8882 | BUILD_BUG_SQE_ELEM(28, __u32, accept_flags); | |
8883 | BUILD_BUG_SQE_ELEM(28, __u32, cancel_flags); | |
8884 | BUILD_BUG_SQE_ELEM(28, __u32, open_flags); | |
8885 | BUILD_BUG_SQE_ELEM(28, __u32, statx_flags); | |
8886 | BUILD_BUG_SQE_ELEM(28, __u32, fadvise_advice); | |
7d67af2c | 8887 | BUILD_BUG_SQE_ELEM(28, __u32, splice_flags); |
d7f62e82 SM |
8888 | BUILD_BUG_SQE_ELEM(32, __u64, user_data); |
8889 | BUILD_BUG_SQE_ELEM(40, __u16, buf_index); | |
8890 | BUILD_BUG_SQE_ELEM(42, __u16, personality); | |
7d67af2c | 8891 | BUILD_BUG_SQE_ELEM(44, __s32, splice_fd_in); |
d7f62e82 | 8892 | |
d3656344 | 8893 | BUILD_BUG_ON(ARRAY_SIZE(io_op_defs) != IORING_OP_LAST); |
84557871 | 8894 | BUILD_BUG_ON(__REQ_F_LAST_BIT >= 8 * sizeof(int)); |
2b188cc1 JA |
8895 | req_cachep = KMEM_CACHE(io_kiocb, SLAB_HWCACHE_ALIGN | SLAB_PANIC); |
8896 | return 0; | |
8897 | }; | |
8898 | __initcall(io_uring_init); |