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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> |
2b188cc1 | 81 | |
c826bd7a DD |
82 | #define CREATE_TRACE_POINTS |
83 | #include <trace/events/io_uring.h> | |
84 | ||
2b188cc1 JA |
85 | #include <uapi/linux/io_uring.h> |
86 | ||
87 | #include "internal.h" | |
561fb04a | 88 | #include "io-wq.h" |
2b188cc1 | 89 | |
5277deaa | 90 | #define IORING_MAX_ENTRIES 32768 |
33a107f0 | 91 | #define IORING_MAX_CQ_ENTRIES (2 * IORING_MAX_ENTRIES) |
65e19f54 JA |
92 | |
93 | /* | |
94 | * Shift of 9 is 512 entries, or exactly one page on 64-bit archs | |
95 | */ | |
96 | #define IORING_FILE_TABLE_SHIFT 9 | |
97 | #define IORING_MAX_FILES_TABLE (1U << IORING_FILE_TABLE_SHIFT) | |
98 | #define IORING_FILE_TABLE_MASK (IORING_MAX_FILES_TABLE - 1) | |
99 | #define IORING_MAX_FIXED_FILES (64 * IORING_MAX_FILES_TABLE) | |
2b188cc1 JA |
100 | |
101 | struct io_uring { | |
102 | u32 head ____cacheline_aligned_in_smp; | |
103 | u32 tail ____cacheline_aligned_in_smp; | |
104 | }; | |
105 | ||
1e84b97b | 106 | /* |
75b28aff HV |
107 | * This data is shared with the application through the mmap at offsets |
108 | * IORING_OFF_SQ_RING and IORING_OFF_CQ_RING. | |
1e84b97b SB |
109 | * |
110 | * The offsets to the member fields are published through struct | |
111 | * io_sqring_offsets when calling io_uring_setup. | |
112 | */ | |
75b28aff | 113 | struct io_rings { |
1e84b97b SB |
114 | /* |
115 | * Head and tail offsets into the ring; the offsets need to be | |
116 | * masked to get valid indices. | |
117 | * | |
75b28aff HV |
118 | * The kernel controls head of the sq ring and the tail of the cq ring, |
119 | * and the application controls tail of the sq ring and the head of the | |
120 | * cq ring. | |
1e84b97b | 121 | */ |
75b28aff | 122 | struct io_uring sq, cq; |
1e84b97b | 123 | /* |
75b28aff | 124 | * Bitmasks to apply to head and tail offsets (constant, equals |
1e84b97b SB |
125 | * ring_entries - 1) |
126 | */ | |
75b28aff HV |
127 | u32 sq_ring_mask, cq_ring_mask; |
128 | /* Ring sizes (constant, power of 2) */ | |
129 | u32 sq_ring_entries, cq_ring_entries; | |
1e84b97b SB |
130 | /* |
131 | * Number of invalid entries dropped by the kernel due to | |
132 | * invalid index stored in array | |
133 | * | |
134 | * Written by the kernel, shouldn't be modified by the | |
135 | * application (i.e. get number of "new events" by comparing to | |
136 | * cached value). | |
137 | * | |
138 | * After a new SQ head value was read by the application this | |
139 | * counter includes all submissions that were dropped reaching | |
140 | * the new SQ head (and possibly more). | |
141 | */ | |
75b28aff | 142 | u32 sq_dropped; |
1e84b97b | 143 | /* |
0d9b5b3a | 144 | * Runtime SQ flags |
1e84b97b SB |
145 | * |
146 | * Written by the kernel, shouldn't be modified by the | |
147 | * application. | |
148 | * | |
149 | * The application needs a full memory barrier before checking | |
150 | * for IORING_SQ_NEED_WAKEUP after updating the sq tail. | |
151 | */ | |
75b28aff | 152 | u32 sq_flags; |
0d9b5b3a SG |
153 | /* |
154 | * Runtime CQ flags | |
155 | * | |
156 | * Written by the application, shouldn't be modified by the | |
157 | * kernel. | |
158 | */ | |
159 | u32 cq_flags; | |
1e84b97b SB |
160 | /* |
161 | * Number of completion events lost because the queue was full; | |
162 | * this should be avoided by the application by making sure | |
0b4295b5 | 163 | * there are not more requests pending than there is space in |
1e84b97b SB |
164 | * the completion queue. |
165 | * | |
166 | * Written by the kernel, shouldn't be modified by the | |
167 | * application (i.e. get number of "new events" by comparing to | |
168 | * cached value). | |
169 | * | |
170 | * As completion events come in out of order this counter is not | |
171 | * ordered with any other data. | |
172 | */ | |
75b28aff | 173 | u32 cq_overflow; |
1e84b97b SB |
174 | /* |
175 | * Ring buffer of completion events. | |
176 | * | |
177 | * The kernel writes completion events fresh every time they are | |
178 | * produced, so the application is allowed to modify pending | |
179 | * entries. | |
180 | */ | |
75b28aff | 181 | struct io_uring_cqe cqes[] ____cacheline_aligned_in_smp; |
2b188cc1 JA |
182 | }; |
183 | ||
edafccee JA |
184 | struct io_mapped_ubuf { |
185 | u64 ubuf; | |
186 | size_t len; | |
187 | struct bio_vec *bvec; | |
188 | unsigned int nr_bvecs; | |
189 | }; | |
190 | ||
65e19f54 JA |
191 | struct fixed_file_table { |
192 | struct file **files; | |
31b51510 JA |
193 | }; |
194 | ||
05589553 XW |
195 | struct fixed_file_ref_node { |
196 | struct percpu_ref refs; | |
197 | struct list_head node; | |
198 | struct list_head file_list; | |
199 | struct fixed_file_data *file_data; | |
4a38aed2 | 200 | struct llist_node llist; |
05589553 XW |
201 | }; |
202 | ||
05f3fb3c JA |
203 | struct fixed_file_data { |
204 | struct fixed_file_table *table; | |
205 | struct io_ring_ctx *ctx; | |
206 | ||
05589553 | 207 | struct percpu_ref *cur_refs; |
05f3fb3c | 208 | struct percpu_ref refs; |
05f3fb3c | 209 | struct completion done; |
05589553 XW |
210 | struct list_head ref_list; |
211 | spinlock_t lock; | |
05f3fb3c JA |
212 | }; |
213 | ||
5a2e745d JA |
214 | struct io_buffer { |
215 | struct list_head list; | |
216 | __u64 addr; | |
217 | __s32 len; | |
218 | __u16 bid; | |
219 | }; | |
220 | ||
2b188cc1 JA |
221 | struct io_ring_ctx { |
222 | struct { | |
223 | struct percpu_ref refs; | |
224 | } ____cacheline_aligned_in_smp; | |
225 | ||
226 | struct { | |
227 | unsigned int flags; | |
e1d85334 RD |
228 | unsigned int compat: 1; |
229 | unsigned int account_mem: 1; | |
230 | unsigned int cq_overflow_flushed: 1; | |
231 | unsigned int drain_next: 1; | |
232 | unsigned int eventfd_async: 1; | |
2b188cc1 | 233 | |
75b28aff HV |
234 | /* |
235 | * Ring buffer of indices into array of io_uring_sqe, which is | |
236 | * mmapped by the application using the IORING_OFF_SQES offset. | |
237 | * | |
238 | * This indirection could e.g. be used to assign fixed | |
239 | * io_uring_sqe entries to operations and only submit them to | |
240 | * the queue when needed. | |
241 | * | |
242 | * The kernel modifies neither the indices array nor the entries | |
243 | * array. | |
244 | */ | |
245 | u32 *sq_array; | |
2b188cc1 JA |
246 | unsigned cached_sq_head; |
247 | unsigned sq_entries; | |
248 | unsigned sq_mask; | |
6c271ce2 | 249 | unsigned sq_thread_idle; |
498ccd9e | 250 | unsigned cached_sq_dropped; |
206aefde | 251 | atomic_t cached_cq_overflow; |
ad3eb2c8 | 252 | unsigned long sq_check_overflow; |
de0617e4 JA |
253 | |
254 | struct list_head defer_list; | |
5262f567 | 255 | struct list_head timeout_list; |
1d7bb1d5 | 256 | struct list_head cq_overflow_list; |
fcb323cc JA |
257 | |
258 | wait_queue_head_t inflight_wait; | |
ad3eb2c8 | 259 | struct io_uring_sqe *sq_sqes; |
2b188cc1 JA |
260 | } ____cacheline_aligned_in_smp; |
261 | ||
206aefde JA |
262 | struct io_rings *rings; |
263 | ||
2b188cc1 | 264 | /* IO offload */ |
561fb04a | 265 | struct io_wq *io_wq; |
6c271ce2 | 266 | struct task_struct *sqo_thread; /* if using sq thread polling */ |
2b188cc1 | 267 | struct mm_struct *sqo_mm; |
6c271ce2 | 268 | wait_queue_head_t sqo_wait; |
75b28aff | 269 | |
6b06314c JA |
270 | /* |
271 | * If used, fixed file set. Writers must ensure that ->refs is dead, | |
272 | * readers must ensure that ->refs is alive as long as the file* is | |
273 | * used. Only updated through io_uring_register(2). | |
274 | */ | |
05f3fb3c | 275 | struct fixed_file_data *file_data; |
6b06314c | 276 | unsigned nr_user_files; |
b14cca0c PB |
277 | int ring_fd; |
278 | struct file *ring_file; | |
6b06314c | 279 | |
edafccee JA |
280 | /* if used, fixed mapped user buffers */ |
281 | unsigned nr_user_bufs; | |
282 | struct io_mapped_ubuf *user_bufs; | |
283 | ||
2b188cc1 JA |
284 | struct user_struct *user; |
285 | ||
0b8c0ec7 | 286 | const struct cred *creds; |
181e448d | 287 | |
0f158b4c JA |
288 | struct completion ref_comp; |
289 | struct completion sq_thread_comp; | |
206aefde | 290 | |
0ddf92e8 JA |
291 | /* if all else fails... */ |
292 | struct io_kiocb *fallback_req; | |
293 | ||
206aefde JA |
294 | #if defined(CONFIG_UNIX) |
295 | struct socket *ring_sock; | |
296 | #endif | |
297 | ||
5a2e745d JA |
298 | struct idr io_buffer_idr; |
299 | ||
071698e1 JA |
300 | struct idr personality_idr; |
301 | ||
206aefde JA |
302 | struct { |
303 | unsigned cached_cq_tail; | |
304 | unsigned cq_entries; | |
305 | unsigned cq_mask; | |
306 | atomic_t cq_timeouts; | |
ad3eb2c8 | 307 | unsigned long cq_check_overflow; |
206aefde JA |
308 | struct wait_queue_head cq_wait; |
309 | struct fasync_struct *cq_fasync; | |
310 | struct eventfd_ctx *cq_ev_fd; | |
311 | } ____cacheline_aligned_in_smp; | |
2b188cc1 JA |
312 | |
313 | struct { | |
314 | struct mutex uring_lock; | |
315 | wait_queue_head_t wait; | |
316 | } ____cacheline_aligned_in_smp; | |
317 | ||
318 | struct { | |
319 | spinlock_t completion_lock; | |
e94f141b | 320 | |
def596e9 JA |
321 | /* |
322 | * ->poll_list is protected by the ctx->uring_lock for | |
323 | * io_uring instances that don't use IORING_SETUP_SQPOLL. | |
324 | * For SQPOLL, only the single threaded io_sq_thread() will | |
325 | * manipulate the list, hence no extra locking is needed there. | |
326 | */ | |
327 | struct list_head poll_list; | |
78076bb6 JA |
328 | struct hlist_head *cancel_hash; |
329 | unsigned cancel_hash_bits; | |
e94f141b | 330 | bool poll_multi_file; |
31b51510 | 331 | |
fcb323cc JA |
332 | spinlock_t inflight_lock; |
333 | struct list_head inflight_list; | |
2b188cc1 | 334 | } ____cacheline_aligned_in_smp; |
85faa7b8 | 335 | |
4a38aed2 JA |
336 | struct delayed_work file_put_work; |
337 | struct llist_head file_put_llist; | |
338 | ||
85faa7b8 | 339 | struct work_struct exit_work; |
2b188cc1 JA |
340 | }; |
341 | ||
09bb8394 JA |
342 | /* |
343 | * First field must be the file pointer in all the | |
344 | * iocb unions! See also 'struct kiocb' in <linux/fs.h> | |
345 | */ | |
221c5eb2 JA |
346 | struct io_poll_iocb { |
347 | struct file *file; | |
0969e783 JA |
348 | union { |
349 | struct wait_queue_head *head; | |
350 | u64 addr; | |
351 | }; | |
221c5eb2 | 352 | __poll_t events; |
8c838788 | 353 | bool done; |
221c5eb2 | 354 | bool canceled; |
392edb45 | 355 | struct wait_queue_entry wait; |
221c5eb2 JA |
356 | }; |
357 | ||
b5dba59e JA |
358 | struct io_close { |
359 | struct file *file; | |
360 | struct file *put_file; | |
361 | int fd; | |
362 | }; | |
363 | ||
ad8a48ac JA |
364 | struct io_timeout_data { |
365 | struct io_kiocb *req; | |
366 | struct hrtimer timer; | |
367 | struct timespec64 ts; | |
368 | enum hrtimer_mode mode; | |
369 | }; | |
370 | ||
8ed8d3c3 JA |
371 | struct io_accept { |
372 | struct file *file; | |
373 | struct sockaddr __user *addr; | |
374 | int __user *addr_len; | |
375 | int flags; | |
09952e3e | 376 | unsigned long nofile; |
8ed8d3c3 JA |
377 | }; |
378 | ||
379 | struct io_sync { | |
380 | struct file *file; | |
381 | loff_t len; | |
382 | loff_t off; | |
383 | int flags; | |
d63d1b5e | 384 | int mode; |
8ed8d3c3 JA |
385 | }; |
386 | ||
fbf23849 JA |
387 | struct io_cancel { |
388 | struct file *file; | |
389 | u64 addr; | |
390 | }; | |
391 | ||
b29472ee JA |
392 | struct io_timeout { |
393 | struct file *file; | |
394 | u64 addr; | |
395 | int flags; | |
bfe68a22 PB |
396 | u32 off; |
397 | u32 target_seq; | |
b29472ee JA |
398 | }; |
399 | ||
9adbd45d JA |
400 | struct io_rw { |
401 | /* NOTE: kiocb has the file as the first member, so don't do it here */ | |
402 | struct kiocb kiocb; | |
403 | u64 addr; | |
404 | u64 len; | |
405 | }; | |
406 | ||
3fbb51c1 JA |
407 | struct io_connect { |
408 | struct file *file; | |
409 | struct sockaddr __user *addr; | |
410 | int addr_len; | |
411 | }; | |
412 | ||
e47293fd JA |
413 | struct io_sr_msg { |
414 | struct file *file; | |
fddaface JA |
415 | union { |
416 | struct user_msghdr __user *msg; | |
417 | void __user *buf; | |
418 | }; | |
e47293fd | 419 | int msg_flags; |
bcda7baa | 420 | int bgid; |
fddaface | 421 | size_t len; |
bcda7baa | 422 | struct io_buffer *kbuf; |
e47293fd JA |
423 | }; |
424 | ||
15b71abe JA |
425 | struct io_open { |
426 | struct file *file; | |
427 | int dfd; | |
15b71abe | 428 | struct filename *filename; |
c12cedf2 | 429 | struct open_how how; |
4022e7af | 430 | unsigned long nofile; |
15b71abe JA |
431 | }; |
432 | ||
05f3fb3c JA |
433 | struct io_files_update { |
434 | struct file *file; | |
435 | u64 arg; | |
436 | u32 nr_args; | |
437 | u32 offset; | |
438 | }; | |
439 | ||
4840e418 JA |
440 | struct io_fadvise { |
441 | struct file *file; | |
442 | u64 offset; | |
443 | u32 len; | |
444 | u32 advice; | |
445 | }; | |
446 | ||
c1ca757b JA |
447 | struct io_madvise { |
448 | struct file *file; | |
449 | u64 addr; | |
450 | u32 len; | |
451 | u32 advice; | |
452 | }; | |
453 | ||
3e4827b0 JA |
454 | struct io_epoll { |
455 | struct file *file; | |
456 | int epfd; | |
457 | int op; | |
458 | int fd; | |
459 | struct epoll_event event; | |
e47293fd JA |
460 | }; |
461 | ||
7d67af2c PB |
462 | struct io_splice { |
463 | struct file *file_out; | |
464 | struct file *file_in; | |
465 | loff_t off_out; | |
466 | loff_t off_in; | |
467 | u64 len; | |
468 | unsigned int flags; | |
469 | }; | |
470 | ||
ddf0322d JA |
471 | struct io_provide_buf { |
472 | struct file *file; | |
473 | __u64 addr; | |
474 | __s32 len; | |
475 | __u32 bgid; | |
476 | __u16 nbufs; | |
477 | __u16 bid; | |
478 | }; | |
479 | ||
1d9e1288 BM |
480 | struct io_statx { |
481 | struct file *file; | |
482 | int dfd; | |
483 | unsigned int mask; | |
484 | unsigned int flags; | |
e62753e4 | 485 | const char __user *filename; |
1d9e1288 BM |
486 | struct statx __user *buffer; |
487 | }; | |
488 | ||
f499a021 JA |
489 | struct io_async_connect { |
490 | struct sockaddr_storage address; | |
491 | }; | |
492 | ||
03b1230c JA |
493 | struct io_async_msghdr { |
494 | struct iovec fast_iov[UIO_FASTIOV]; | |
495 | struct iovec *iov; | |
496 | struct sockaddr __user *uaddr; | |
497 | struct msghdr msg; | |
b537916c | 498 | struct sockaddr_storage addr; |
03b1230c JA |
499 | }; |
500 | ||
f67676d1 JA |
501 | struct io_async_rw { |
502 | struct iovec fast_iov[UIO_FASTIOV]; | |
503 | struct iovec *iov; | |
504 | ssize_t nr_segs; | |
505 | ssize_t size; | |
506 | }; | |
507 | ||
1a6b74fc | 508 | struct io_async_ctx { |
f67676d1 JA |
509 | union { |
510 | struct io_async_rw rw; | |
03b1230c | 511 | struct io_async_msghdr msg; |
f499a021 | 512 | struct io_async_connect connect; |
2d28390a | 513 | struct io_timeout_data timeout; |
f67676d1 | 514 | }; |
1a6b74fc JA |
515 | }; |
516 | ||
6b47ee6e PB |
517 | enum { |
518 | REQ_F_FIXED_FILE_BIT = IOSQE_FIXED_FILE_BIT, | |
519 | REQ_F_IO_DRAIN_BIT = IOSQE_IO_DRAIN_BIT, | |
520 | REQ_F_LINK_BIT = IOSQE_IO_LINK_BIT, | |
521 | REQ_F_HARDLINK_BIT = IOSQE_IO_HARDLINK_BIT, | |
522 | REQ_F_FORCE_ASYNC_BIT = IOSQE_ASYNC_BIT, | |
bcda7baa | 523 | REQ_F_BUFFER_SELECT_BIT = IOSQE_BUFFER_SELECT_BIT, |
6b47ee6e | 524 | |
dea3b49c | 525 | REQ_F_LINK_HEAD_BIT, |
6b47ee6e PB |
526 | REQ_F_LINK_NEXT_BIT, |
527 | REQ_F_FAIL_LINK_BIT, | |
528 | REQ_F_INFLIGHT_BIT, | |
529 | REQ_F_CUR_POS_BIT, | |
530 | REQ_F_NOWAIT_BIT, | |
6b47ee6e PB |
531 | REQ_F_LINK_TIMEOUT_BIT, |
532 | REQ_F_TIMEOUT_BIT, | |
533 | REQ_F_ISREG_BIT, | |
534 | REQ_F_MUST_PUNT_BIT, | |
535 | REQ_F_TIMEOUT_NOSEQ_BIT, | |
536 | REQ_F_COMP_LOCKED_BIT, | |
99bc4c38 | 537 | REQ_F_NEED_CLEANUP_BIT, |
2ca10259 | 538 | REQ_F_OVERFLOW_BIT, |
d7718a9d | 539 | REQ_F_POLLED_BIT, |
bcda7baa | 540 | REQ_F_BUFFER_SELECTED_BIT, |
5b0bbee4 | 541 | REQ_F_NO_FILE_TABLE_BIT, |
d4c81f38 | 542 | REQ_F_QUEUE_TIMEOUT_BIT, |
7cdaf587 | 543 | REQ_F_WORK_INITIALIZED_BIT, |
4dd2824d | 544 | REQ_F_TASK_PINNED_BIT, |
84557871 JA |
545 | |
546 | /* not a real bit, just to check we're not overflowing the space */ | |
547 | __REQ_F_LAST_BIT, | |
6b47ee6e PB |
548 | }; |
549 | ||
550 | enum { | |
551 | /* ctx owns file */ | |
552 | REQ_F_FIXED_FILE = BIT(REQ_F_FIXED_FILE_BIT), | |
553 | /* drain existing IO first */ | |
554 | REQ_F_IO_DRAIN = BIT(REQ_F_IO_DRAIN_BIT), | |
555 | /* linked sqes */ | |
556 | REQ_F_LINK = BIT(REQ_F_LINK_BIT), | |
557 | /* doesn't sever on completion < 0 */ | |
558 | REQ_F_HARDLINK = BIT(REQ_F_HARDLINK_BIT), | |
559 | /* IOSQE_ASYNC */ | |
560 | REQ_F_FORCE_ASYNC = BIT(REQ_F_FORCE_ASYNC_BIT), | |
bcda7baa JA |
561 | /* IOSQE_BUFFER_SELECT */ |
562 | REQ_F_BUFFER_SELECT = BIT(REQ_F_BUFFER_SELECT_BIT), | |
6b47ee6e | 563 | |
dea3b49c PB |
564 | /* head of a link */ |
565 | REQ_F_LINK_HEAD = BIT(REQ_F_LINK_HEAD_BIT), | |
6b47ee6e PB |
566 | /* already grabbed next link */ |
567 | REQ_F_LINK_NEXT = BIT(REQ_F_LINK_NEXT_BIT), | |
568 | /* fail rest of links */ | |
569 | REQ_F_FAIL_LINK = BIT(REQ_F_FAIL_LINK_BIT), | |
570 | /* on inflight list */ | |
571 | REQ_F_INFLIGHT = BIT(REQ_F_INFLIGHT_BIT), | |
572 | /* read/write uses file position */ | |
573 | REQ_F_CUR_POS = BIT(REQ_F_CUR_POS_BIT), | |
574 | /* must not punt to workers */ | |
575 | REQ_F_NOWAIT = BIT(REQ_F_NOWAIT_BIT), | |
6b47ee6e PB |
576 | /* has linked timeout */ |
577 | REQ_F_LINK_TIMEOUT = BIT(REQ_F_LINK_TIMEOUT_BIT), | |
578 | /* timeout request */ | |
579 | REQ_F_TIMEOUT = BIT(REQ_F_TIMEOUT_BIT), | |
580 | /* regular file */ | |
581 | REQ_F_ISREG = BIT(REQ_F_ISREG_BIT), | |
582 | /* must be punted even for NONBLOCK */ | |
583 | REQ_F_MUST_PUNT = BIT(REQ_F_MUST_PUNT_BIT), | |
584 | /* no timeout sequence */ | |
585 | REQ_F_TIMEOUT_NOSEQ = BIT(REQ_F_TIMEOUT_NOSEQ_BIT), | |
586 | /* completion under lock */ | |
587 | REQ_F_COMP_LOCKED = BIT(REQ_F_COMP_LOCKED_BIT), | |
99bc4c38 PB |
588 | /* needs cleanup */ |
589 | REQ_F_NEED_CLEANUP = BIT(REQ_F_NEED_CLEANUP_BIT), | |
2ca10259 JA |
590 | /* in overflow list */ |
591 | REQ_F_OVERFLOW = BIT(REQ_F_OVERFLOW_BIT), | |
d7718a9d JA |
592 | /* already went through poll handler */ |
593 | REQ_F_POLLED = BIT(REQ_F_POLLED_BIT), | |
bcda7baa JA |
594 | /* buffer already selected */ |
595 | REQ_F_BUFFER_SELECTED = BIT(REQ_F_BUFFER_SELECTED_BIT), | |
5b0bbee4 JA |
596 | /* doesn't need file table for this request */ |
597 | REQ_F_NO_FILE_TABLE = BIT(REQ_F_NO_FILE_TABLE_BIT), | |
d4c81f38 PB |
598 | /* needs to queue linked timeout */ |
599 | REQ_F_QUEUE_TIMEOUT = BIT(REQ_F_QUEUE_TIMEOUT_BIT), | |
7cdaf587 XW |
600 | /* io_wq_work is initialized */ |
601 | REQ_F_WORK_INITIALIZED = BIT(REQ_F_WORK_INITIALIZED_BIT), | |
4dd2824d PB |
602 | /* req->task is refcounted */ |
603 | REQ_F_TASK_PINNED = BIT(REQ_F_TASK_PINNED_BIT), | |
d7718a9d JA |
604 | }; |
605 | ||
606 | struct async_poll { | |
607 | struct io_poll_iocb poll; | |
608 | struct io_wq_work work; | |
6b47ee6e PB |
609 | }; |
610 | ||
09bb8394 JA |
611 | /* |
612 | * NOTE! Each of the iocb union members has the file pointer | |
613 | * as the first entry in their struct definition. So you can | |
614 | * access the file pointer through any of the sub-structs, | |
615 | * or directly as just 'ki_filp' in this struct. | |
616 | */ | |
2b188cc1 | 617 | struct io_kiocb { |
221c5eb2 | 618 | union { |
09bb8394 | 619 | struct file *file; |
9adbd45d | 620 | struct io_rw rw; |
221c5eb2 | 621 | struct io_poll_iocb poll; |
8ed8d3c3 JA |
622 | struct io_accept accept; |
623 | struct io_sync sync; | |
fbf23849 | 624 | struct io_cancel cancel; |
b29472ee | 625 | struct io_timeout timeout; |
3fbb51c1 | 626 | struct io_connect connect; |
e47293fd | 627 | struct io_sr_msg sr_msg; |
15b71abe | 628 | struct io_open open; |
b5dba59e | 629 | struct io_close close; |
05f3fb3c | 630 | struct io_files_update files_update; |
4840e418 | 631 | struct io_fadvise fadvise; |
c1ca757b | 632 | struct io_madvise madvise; |
3e4827b0 | 633 | struct io_epoll epoll; |
7d67af2c | 634 | struct io_splice splice; |
ddf0322d | 635 | struct io_provide_buf pbuf; |
1d9e1288 | 636 | struct io_statx statx; |
221c5eb2 | 637 | }; |
2b188cc1 | 638 | |
1a6b74fc | 639 | struct io_async_ctx *io; |
c398ecb3 | 640 | int cflags; |
d625c6ee | 641 | u8 opcode; |
65a6543d XW |
642 | /* polled IO has completed */ |
643 | u8 iopoll_completed; | |
2b188cc1 | 644 | |
4f4eeba8 BM |
645 | u16 buf_index; |
646 | ||
2b188cc1 | 647 | struct io_ring_ctx *ctx; |
d7718a9d | 648 | struct list_head list; |
2b188cc1 | 649 | unsigned int flags; |
c16361c1 | 650 | refcount_t refs; |
3537b6a7 JA |
651 | struct task_struct *task; |
652 | unsigned long fsize; | |
2b188cc1 | 653 | u64 user_data; |
9e645e11 | 654 | u32 result; |
de0617e4 | 655 | u32 sequence; |
2b188cc1 | 656 | |
d7718a9d JA |
657 | struct list_head link_list; |
658 | ||
fcb323cc JA |
659 | struct list_head inflight_entry; |
660 | ||
05589553 XW |
661 | struct percpu_ref *fixed_file_refs; |
662 | ||
b41e9852 JA |
663 | union { |
664 | /* | |
665 | * Only commands that never go async can use the below fields, | |
d7718a9d JA |
666 | * obviously. Right now only IORING_OP_POLL_ADD uses them, and |
667 | * async armed poll handlers for regular commands. The latter | |
668 | * restore the work, if needed. | |
b41e9852 JA |
669 | */ |
670 | struct { | |
b41e9852 | 671 | struct callback_head task_work; |
d7718a9d JA |
672 | struct hlist_node hash_node; |
673 | struct async_poll *apoll; | |
b41e9852 JA |
674 | }; |
675 | struct io_wq_work work; | |
676 | }; | |
2b188cc1 JA |
677 | }; |
678 | ||
679 | #define IO_PLUG_THRESHOLD 2 | |
def596e9 | 680 | #define IO_IOPOLL_BATCH 8 |
2b188cc1 | 681 | |
9a56a232 JA |
682 | struct io_submit_state { |
683 | struct blk_plug plug; | |
684 | ||
2579f913 JA |
685 | /* |
686 | * io_kiocb alloc cache | |
687 | */ | |
688 | void *reqs[IO_IOPOLL_BATCH]; | |
6c8a3134 | 689 | unsigned int free_reqs; |
2579f913 | 690 | |
9a56a232 JA |
691 | /* |
692 | * File reference cache | |
693 | */ | |
694 | struct file *file; | |
695 | unsigned int fd; | |
696 | unsigned int has_refs; | |
697 | unsigned int used_refs; | |
698 | unsigned int ios_left; | |
699 | }; | |
700 | ||
d3656344 JA |
701 | struct io_op_def { |
702 | /* needs req->io allocated for deferral/async */ | |
703 | unsigned async_ctx : 1; | |
704 | /* needs current->mm setup, does mm access */ | |
705 | unsigned needs_mm : 1; | |
706 | /* needs req->file assigned */ | |
707 | unsigned needs_file : 1; | |
fd2206e4 JA |
708 | /* don't fail if file grab fails */ |
709 | unsigned needs_file_no_error : 1; | |
d3656344 JA |
710 | /* hash wq insertion if file is a regular file */ |
711 | unsigned hash_reg_file : 1; | |
712 | /* unbound wq insertion if file is a non-regular file */ | |
713 | unsigned unbound_nonreg_file : 1; | |
66f4af93 JA |
714 | /* opcode is not supported by this kernel */ |
715 | unsigned not_supported : 1; | |
f86cd20c JA |
716 | /* needs file table */ |
717 | unsigned file_table : 1; | |
ff002b30 JA |
718 | /* needs ->fs */ |
719 | unsigned needs_fs : 1; | |
8a72758c JA |
720 | /* set if opcode supports polled "wait" */ |
721 | unsigned pollin : 1; | |
722 | unsigned pollout : 1; | |
bcda7baa JA |
723 | /* op supports buffer selection */ |
724 | unsigned buffer_select : 1; | |
d3656344 JA |
725 | }; |
726 | ||
727 | static const struct io_op_def io_op_defs[] = { | |
0463b6c5 PB |
728 | [IORING_OP_NOP] = {}, |
729 | [IORING_OP_READV] = { | |
d3656344 JA |
730 | .async_ctx = 1, |
731 | .needs_mm = 1, | |
732 | .needs_file = 1, | |
733 | .unbound_nonreg_file = 1, | |
8a72758c | 734 | .pollin = 1, |
4d954c25 | 735 | .buffer_select = 1, |
d3656344 | 736 | }, |
0463b6c5 | 737 | [IORING_OP_WRITEV] = { |
d3656344 JA |
738 | .async_ctx = 1, |
739 | .needs_mm = 1, | |
740 | .needs_file = 1, | |
741 | .hash_reg_file = 1, | |
742 | .unbound_nonreg_file = 1, | |
8a72758c | 743 | .pollout = 1, |
d3656344 | 744 | }, |
0463b6c5 | 745 | [IORING_OP_FSYNC] = { |
d3656344 JA |
746 | .needs_file = 1, |
747 | }, | |
0463b6c5 | 748 | [IORING_OP_READ_FIXED] = { |
d3656344 JA |
749 | .needs_file = 1, |
750 | .unbound_nonreg_file = 1, | |
8a72758c | 751 | .pollin = 1, |
d3656344 | 752 | }, |
0463b6c5 | 753 | [IORING_OP_WRITE_FIXED] = { |
d3656344 JA |
754 | .needs_file = 1, |
755 | .hash_reg_file = 1, | |
756 | .unbound_nonreg_file = 1, | |
8a72758c | 757 | .pollout = 1, |
d3656344 | 758 | }, |
0463b6c5 | 759 | [IORING_OP_POLL_ADD] = { |
d3656344 JA |
760 | .needs_file = 1, |
761 | .unbound_nonreg_file = 1, | |
762 | }, | |
0463b6c5 PB |
763 | [IORING_OP_POLL_REMOVE] = {}, |
764 | [IORING_OP_SYNC_FILE_RANGE] = { | |
d3656344 JA |
765 | .needs_file = 1, |
766 | }, | |
0463b6c5 | 767 | [IORING_OP_SENDMSG] = { |
d3656344 JA |
768 | .async_ctx = 1, |
769 | .needs_mm = 1, | |
770 | .needs_file = 1, | |
771 | .unbound_nonreg_file = 1, | |
ff002b30 | 772 | .needs_fs = 1, |
8a72758c | 773 | .pollout = 1, |
d3656344 | 774 | }, |
0463b6c5 | 775 | [IORING_OP_RECVMSG] = { |
d3656344 JA |
776 | .async_ctx = 1, |
777 | .needs_mm = 1, | |
778 | .needs_file = 1, | |
779 | .unbound_nonreg_file = 1, | |
ff002b30 | 780 | .needs_fs = 1, |
8a72758c | 781 | .pollin = 1, |
52de1fe1 | 782 | .buffer_select = 1, |
d3656344 | 783 | }, |
0463b6c5 | 784 | [IORING_OP_TIMEOUT] = { |
d3656344 JA |
785 | .async_ctx = 1, |
786 | .needs_mm = 1, | |
787 | }, | |
0463b6c5 PB |
788 | [IORING_OP_TIMEOUT_REMOVE] = {}, |
789 | [IORING_OP_ACCEPT] = { | |
d3656344 JA |
790 | .needs_mm = 1, |
791 | .needs_file = 1, | |
792 | .unbound_nonreg_file = 1, | |
f86cd20c | 793 | .file_table = 1, |
8a72758c | 794 | .pollin = 1, |
d3656344 | 795 | }, |
0463b6c5 PB |
796 | [IORING_OP_ASYNC_CANCEL] = {}, |
797 | [IORING_OP_LINK_TIMEOUT] = { | |
d3656344 JA |
798 | .async_ctx = 1, |
799 | .needs_mm = 1, | |
800 | }, | |
0463b6c5 | 801 | [IORING_OP_CONNECT] = { |
d3656344 JA |
802 | .async_ctx = 1, |
803 | .needs_mm = 1, | |
804 | .needs_file = 1, | |
805 | .unbound_nonreg_file = 1, | |
8a72758c | 806 | .pollout = 1, |
d3656344 | 807 | }, |
0463b6c5 | 808 | [IORING_OP_FALLOCATE] = { |
d3656344 JA |
809 | .needs_file = 1, |
810 | }, | |
0463b6c5 | 811 | [IORING_OP_OPENAT] = { |
f86cd20c | 812 | .file_table = 1, |
ff002b30 | 813 | .needs_fs = 1, |
d3656344 | 814 | }, |
0463b6c5 | 815 | [IORING_OP_CLOSE] = { |
fd2206e4 JA |
816 | .needs_file = 1, |
817 | .needs_file_no_error = 1, | |
f86cd20c | 818 | .file_table = 1, |
d3656344 | 819 | }, |
0463b6c5 | 820 | [IORING_OP_FILES_UPDATE] = { |
d3656344 | 821 | .needs_mm = 1, |
f86cd20c | 822 | .file_table = 1, |
d3656344 | 823 | }, |
0463b6c5 | 824 | [IORING_OP_STATX] = { |
d3656344 | 825 | .needs_mm = 1, |
ff002b30 | 826 | .needs_fs = 1, |
5b0bbee4 | 827 | .file_table = 1, |
d3656344 | 828 | }, |
0463b6c5 | 829 | [IORING_OP_READ] = { |
3a6820f2 JA |
830 | .needs_mm = 1, |
831 | .needs_file = 1, | |
832 | .unbound_nonreg_file = 1, | |
8a72758c | 833 | .pollin = 1, |
bcda7baa | 834 | .buffer_select = 1, |
3a6820f2 | 835 | }, |
0463b6c5 | 836 | [IORING_OP_WRITE] = { |
3a6820f2 JA |
837 | .needs_mm = 1, |
838 | .needs_file = 1, | |
839 | .unbound_nonreg_file = 1, | |
8a72758c | 840 | .pollout = 1, |
3a6820f2 | 841 | }, |
0463b6c5 | 842 | [IORING_OP_FADVISE] = { |
4840e418 JA |
843 | .needs_file = 1, |
844 | }, | |
0463b6c5 | 845 | [IORING_OP_MADVISE] = { |
c1ca757b JA |
846 | .needs_mm = 1, |
847 | }, | |
0463b6c5 | 848 | [IORING_OP_SEND] = { |
fddaface JA |
849 | .needs_mm = 1, |
850 | .needs_file = 1, | |
851 | .unbound_nonreg_file = 1, | |
8a72758c | 852 | .pollout = 1, |
fddaface | 853 | }, |
0463b6c5 | 854 | [IORING_OP_RECV] = { |
fddaface JA |
855 | .needs_mm = 1, |
856 | .needs_file = 1, | |
857 | .unbound_nonreg_file = 1, | |
8a72758c | 858 | .pollin = 1, |
bcda7baa | 859 | .buffer_select = 1, |
fddaface | 860 | }, |
0463b6c5 | 861 | [IORING_OP_OPENAT2] = { |
f86cd20c | 862 | .file_table = 1, |
ff002b30 | 863 | .needs_fs = 1, |
cebdb986 | 864 | }, |
3e4827b0 JA |
865 | [IORING_OP_EPOLL_CTL] = { |
866 | .unbound_nonreg_file = 1, | |
867 | .file_table = 1, | |
868 | }, | |
7d67af2c PB |
869 | [IORING_OP_SPLICE] = { |
870 | .needs_file = 1, | |
871 | .hash_reg_file = 1, | |
872 | .unbound_nonreg_file = 1, | |
ddf0322d JA |
873 | }, |
874 | [IORING_OP_PROVIDE_BUFFERS] = {}, | |
067524e9 | 875 | [IORING_OP_REMOVE_BUFFERS] = {}, |
f2a8d5c7 PB |
876 | [IORING_OP_TEE] = { |
877 | .needs_file = 1, | |
878 | .hash_reg_file = 1, | |
879 | .unbound_nonreg_file = 1, | |
880 | }, | |
d3656344 JA |
881 | }; |
882 | ||
561fb04a | 883 | static void io_wq_submit_work(struct io_wq_work **workptr); |
78e19bbe | 884 | static void io_cqring_fill_event(struct io_kiocb *req, long res); |
ec9c02ad | 885 | static void io_put_req(struct io_kiocb *req); |
978db57e | 886 | static void __io_double_put_req(struct io_kiocb *req); |
94ae5e77 JA |
887 | static struct io_kiocb *io_prep_linked_timeout(struct io_kiocb *req); |
888 | static void io_queue_linked_timeout(struct io_kiocb *req); | |
05f3fb3c JA |
889 | static int __io_sqe_files_update(struct io_ring_ctx *ctx, |
890 | struct io_uring_files_update *ip, | |
891 | unsigned nr_args); | |
f86cd20c | 892 | static int io_grab_files(struct io_kiocb *req); |
99bc4c38 | 893 | static void io_cleanup_req(struct io_kiocb *req); |
b41e9852 JA |
894 | static int io_file_get(struct io_submit_state *state, struct io_kiocb *req, |
895 | int fd, struct file **out_file, bool fixed); | |
896 | static void __io_queue_sqe(struct io_kiocb *req, | |
897 | const struct io_uring_sqe *sqe); | |
de0617e4 | 898 | |
2b188cc1 JA |
899 | static struct kmem_cache *req_cachep; |
900 | ||
901 | static const struct file_operations io_uring_fops; | |
902 | ||
903 | struct sock *io_uring_get_socket(struct file *file) | |
904 | { | |
905 | #if defined(CONFIG_UNIX) | |
906 | if (file->f_op == &io_uring_fops) { | |
907 | struct io_ring_ctx *ctx = file->private_data; | |
908 | ||
909 | return ctx->ring_sock->sk; | |
910 | } | |
911 | #endif | |
912 | return NULL; | |
913 | } | |
914 | EXPORT_SYMBOL(io_uring_get_socket); | |
915 | ||
4dd2824d PB |
916 | static void io_get_req_task(struct io_kiocb *req) |
917 | { | |
918 | if (req->flags & REQ_F_TASK_PINNED) | |
919 | return; | |
920 | get_task_struct(req->task); | |
921 | req->flags |= REQ_F_TASK_PINNED; | |
922 | } | |
923 | ||
924 | /* not idempotent -- it doesn't clear REQ_F_TASK_PINNED */ | |
925 | static void __io_put_req_task(struct io_kiocb *req) | |
926 | { | |
927 | if (req->flags & REQ_F_TASK_PINNED) | |
928 | put_task_struct(req->task); | |
929 | } | |
930 | ||
4a38aed2 JA |
931 | static void io_file_put_work(struct work_struct *work); |
932 | ||
7cdaf587 XW |
933 | /* |
934 | * Note: must call io_req_init_async() for the first time you | |
935 | * touch any members of io_wq_work. | |
936 | */ | |
937 | static inline void io_req_init_async(struct io_kiocb *req) | |
938 | { | |
939 | if (req->flags & REQ_F_WORK_INITIALIZED) | |
940 | return; | |
941 | ||
942 | memset(&req->work, 0, sizeof(req->work)); | |
943 | req->flags |= REQ_F_WORK_INITIALIZED; | |
944 | } | |
945 | ||
0cdaf760 PB |
946 | static inline bool io_async_submit(struct io_ring_ctx *ctx) |
947 | { | |
948 | return ctx->flags & IORING_SETUP_SQPOLL; | |
949 | } | |
950 | ||
2b188cc1 JA |
951 | static void io_ring_ctx_ref_free(struct percpu_ref *ref) |
952 | { | |
953 | struct io_ring_ctx *ctx = container_of(ref, struct io_ring_ctx, refs); | |
954 | ||
0f158b4c | 955 | complete(&ctx->ref_comp); |
2b188cc1 JA |
956 | } |
957 | ||
958 | static struct io_ring_ctx *io_ring_ctx_alloc(struct io_uring_params *p) | |
959 | { | |
960 | struct io_ring_ctx *ctx; | |
78076bb6 | 961 | int hash_bits; |
2b188cc1 JA |
962 | |
963 | ctx = kzalloc(sizeof(*ctx), GFP_KERNEL); | |
964 | if (!ctx) | |
965 | return NULL; | |
966 | ||
0ddf92e8 JA |
967 | ctx->fallback_req = kmem_cache_alloc(req_cachep, GFP_KERNEL); |
968 | if (!ctx->fallback_req) | |
969 | goto err; | |
970 | ||
78076bb6 JA |
971 | /* |
972 | * Use 5 bits less than the max cq entries, that should give us around | |
973 | * 32 entries per hash list if totally full and uniformly spread. | |
974 | */ | |
975 | hash_bits = ilog2(p->cq_entries); | |
976 | hash_bits -= 5; | |
977 | if (hash_bits <= 0) | |
978 | hash_bits = 1; | |
979 | ctx->cancel_hash_bits = hash_bits; | |
980 | ctx->cancel_hash = kmalloc((1U << hash_bits) * sizeof(struct hlist_head), | |
981 | GFP_KERNEL); | |
982 | if (!ctx->cancel_hash) | |
983 | goto err; | |
984 | __hash_init(ctx->cancel_hash, 1U << hash_bits); | |
985 | ||
21482896 | 986 | if (percpu_ref_init(&ctx->refs, io_ring_ctx_ref_free, |
206aefde JA |
987 | PERCPU_REF_ALLOW_REINIT, GFP_KERNEL)) |
988 | goto err; | |
2b188cc1 JA |
989 | |
990 | ctx->flags = p->flags; | |
583863ed | 991 | init_waitqueue_head(&ctx->sqo_wait); |
2b188cc1 | 992 | init_waitqueue_head(&ctx->cq_wait); |
1d7bb1d5 | 993 | INIT_LIST_HEAD(&ctx->cq_overflow_list); |
0f158b4c JA |
994 | init_completion(&ctx->ref_comp); |
995 | init_completion(&ctx->sq_thread_comp); | |
5a2e745d | 996 | idr_init(&ctx->io_buffer_idr); |
071698e1 | 997 | idr_init(&ctx->personality_idr); |
2b188cc1 JA |
998 | mutex_init(&ctx->uring_lock); |
999 | init_waitqueue_head(&ctx->wait); | |
1000 | spin_lock_init(&ctx->completion_lock); | |
def596e9 | 1001 | INIT_LIST_HEAD(&ctx->poll_list); |
de0617e4 | 1002 | INIT_LIST_HEAD(&ctx->defer_list); |
5262f567 | 1003 | INIT_LIST_HEAD(&ctx->timeout_list); |
fcb323cc JA |
1004 | init_waitqueue_head(&ctx->inflight_wait); |
1005 | spin_lock_init(&ctx->inflight_lock); | |
1006 | INIT_LIST_HEAD(&ctx->inflight_list); | |
4a38aed2 JA |
1007 | INIT_DELAYED_WORK(&ctx->file_put_work, io_file_put_work); |
1008 | init_llist_head(&ctx->file_put_llist); | |
2b188cc1 | 1009 | return ctx; |
206aefde | 1010 | err: |
0ddf92e8 JA |
1011 | if (ctx->fallback_req) |
1012 | kmem_cache_free(req_cachep, ctx->fallback_req); | |
78076bb6 | 1013 | kfree(ctx->cancel_hash); |
206aefde JA |
1014 | kfree(ctx); |
1015 | return NULL; | |
2b188cc1 JA |
1016 | } |
1017 | ||
9d858b21 | 1018 | static inline bool __req_need_defer(struct io_kiocb *req) |
7adf4eaf | 1019 | { |
a197f664 JL |
1020 | struct io_ring_ctx *ctx = req->ctx; |
1021 | ||
31af27c7 PB |
1022 | return req->sequence != ctx->cached_cq_tail |
1023 | + atomic_read(&ctx->cached_cq_overflow); | |
7adf4eaf JA |
1024 | } |
1025 | ||
9d858b21 | 1026 | static inline bool req_need_defer(struct io_kiocb *req) |
de0617e4 | 1027 | { |
87987898 | 1028 | if (unlikely(req->flags & REQ_F_IO_DRAIN)) |
9d858b21 | 1029 | return __req_need_defer(req); |
de0617e4 | 1030 | |
9d858b21 | 1031 | return false; |
de0617e4 JA |
1032 | } |
1033 | ||
de0617e4 | 1034 | static void __io_commit_cqring(struct io_ring_ctx *ctx) |
2b188cc1 | 1035 | { |
75b28aff | 1036 | struct io_rings *rings = ctx->rings; |
2b188cc1 | 1037 | |
07910158 PB |
1038 | /* order cqe stores with ring update */ |
1039 | smp_store_release(&rings->cq.tail, ctx->cached_cq_tail); | |
2b188cc1 | 1040 | |
07910158 PB |
1041 | if (wq_has_sleeper(&ctx->cq_wait)) { |
1042 | wake_up_interruptible(&ctx->cq_wait); | |
1043 | kill_fasync(&ctx->cq_fasync, SIGIO, POLL_IN); | |
2b188cc1 JA |
1044 | } |
1045 | } | |
1046 | ||
cccf0ee8 JA |
1047 | static inline void io_req_work_grab_env(struct io_kiocb *req, |
1048 | const struct io_op_def *def) | |
1049 | { | |
1050 | if (!req->work.mm && def->needs_mm) { | |
1051 | mmgrab(current->mm); | |
1052 | req->work.mm = current->mm; | |
2b188cc1 | 1053 | } |
cccf0ee8 JA |
1054 | if (!req->work.creds) |
1055 | req->work.creds = get_current_cred(); | |
ff002b30 JA |
1056 | if (!req->work.fs && def->needs_fs) { |
1057 | spin_lock(¤t->fs->lock); | |
1058 | if (!current->fs->in_exec) { | |
1059 | req->work.fs = current->fs; | |
1060 | req->work.fs->users++; | |
1061 | } else { | |
1062 | req->work.flags |= IO_WQ_WORK_CANCEL; | |
1063 | } | |
1064 | spin_unlock(¤t->fs->lock); | |
1065 | } | |
2b188cc1 JA |
1066 | } |
1067 | ||
cccf0ee8 | 1068 | static inline void io_req_work_drop_env(struct io_kiocb *req) |
18d9be1a | 1069 | { |
7cdaf587 XW |
1070 | if (!(req->flags & REQ_F_WORK_INITIALIZED)) |
1071 | return; | |
1072 | ||
cccf0ee8 JA |
1073 | if (req->work.mm) { |
1074 | mmdrop(req->work.mm); | |
1075 | req->work.mm = NULL; | |
1076 | } | |
1077 | if (req->work.creds) { | |
1078 | put_cred(req->work.creds); | |
1079 | req->work.creds = NULL; | |
1080 | } | |
ff002b30 JA |
1081 | if (req->work.fs) { |
1082 | struct fs_struct *fs = req->work.fs; | |
1083 | ||
1084 | spin_lock(&req->work.fs->lock); | |
1085 | if (--fs->users) | |
1086 | fs = NULL; | |
1087 | spin_unlock(&req->work.fs->lock); | |
1088 | if (fs) | |
1089 | free_fs_struct(fs); | |
1090 | } | |
561fb04a JA |
1091 | } |
1092 | ||
8766dd51 | 1093 | static inline void io_prep_async_work(struct io_kiocb *req, |
94ae5e77 | 1094 | struct io_kiocb **link) |
18d9be1a | 1095 | { |
d3656344 | 1096 | const struct io_op_def *def = &io_op_defs[req->opcode]; |
54a91f3b | 1097 | |
d3656344 JA |
1098 | if (req->flags & REQ_F_ISREG) { |
1099 | if (def->hash_reg_file) | |
8766dd51 | 1100 | io_wq_hash_work(&req->work, file_inode(req->file)); |
d3656344 JA |
1101 | } else { |
1102 | if (def->unbound_nonreg_file) | |
3529d8c2 | 1103 | req->work.flags |= IO_WQ_WORK_UNBOUND; |
54a91f3b | 1104 | } |
cccf0ee8 | 1105 | |
59960b9d | 1106 | io_req_init_async(req); |
cccf0ee8 | 1107 | io_req_work_grab_env(req, def); |
54a91f3b | 1108 | |
94ae5e77 | 1109 | *link = io_prep_linked_timeout(req); |
561fb04a JA |
1110 | } |
1111 | ||
a197f664 | 1112 | static inline void io_queue_async_work(struct io_kiocb *req) |
561fb04a | 1113 | { |
a197f664 | 1114 | struct io_ring_ctx *ctx = req->ctx; |
94ae5e77 | 1115 | struct io_kiocb *link; |
94ae5e77 | 1116 | |
8766dd51 | 1117 | io_prep_async_work(req, &link); |
561fb04a | 1118 | |
8766dd51 PB |
1119 | trace_io_uring_queue_async_work(ctx, io_wq_is_hashed(&req->work), req, |
1120 | &req->work, req->flags); | |
1121 | io_wq_enqueue(ctx->io_wq, &req->work); | |
94ae5e77 JA |
1122 | |
1123 | if (link) | |
1124 | io_queue_linked_timeout(link); | |
18d9be1a JA |
1125 | } |
1126 | ||
5262f567 JA |
1127 | static void io_kill_timeout(struct io_kiocb *req) |
1128 | { | |
1129 | int ret; | |
1130 | ||
2d28390a | 1131 | ret = hrtimer_try_to_cancel(&req->io->timeout.timer); |
5262f567 JA |
1132 | if (ret != -1) { |
1133 | atomic_inc(&req->ctx->cq_timeouts); | |
842f9612 | 1134 | list_del_init(&req->list); |
f0e20b89 | 1135 | req->flags |= REQ_F_COMP_LOCKED; |
78e19bbe | 1136 | io_cqring_fill_event(req, 0); |
ec9c02ad | 1137 | io_put_req(req); |
5262f567 JA |
1138 | } |
1139 | } | |
1140 | ||
1141 | static void io_kill_timeouts(struct io_ring_ctx *ctx) | |
1142 | { | |
1143 | struct io_kiocb *req, *tmp; | |
1144 | ||
1145 | spin_lock_irq(&ctx->completion_lock); | |
1146 | list_for_each_entry_safe(req, tmp, &ctx->timeout_list, list) | |
1147 | io_kill_timeout(req); | |
1148 | spin_unlock_irq(&ctx->completion_lock); | |
1149 | } | |
1150 | ||
04518945 | 1151 | static void __io_queue_deferred(struct io_ring_ctx *ctx) |
de0617e4 | 1152 | { |
04518945 PB |
1153 | do { |
1154 | struct io_kiocb *req = list_first_entry(&ctx->defer_list, | |
1155 | struct io_kiocb, list); | |
de0617e4 | 1156 | |
04518945 PB |
1157 | if (req_need_defer(req)) |
1158 | break; | |
1159 | list_del_init(&req->list); | |
1160 | io_queue_async_work(req); | |
1161 | } while (!list_empty(&ctx->defer_list)); | |
1162 | } | |
1163 | ||
360428f8 | 1164 | static void io_flush_timeouts(struct io_ring_ctx *ctx) |
de0617e4 | 1165 | { |
360428f8 PB |
1166 | while (!list_empty(&ctx->timeout_list)) { |
1167 | struct io_kiocb *req = list_first_entry(&ctx->timeout_list, | |
1168 | struct io_kiocb, list); | |
de0617e4 | 1169 | |
360428f8 PB |
1170 | if (req->flags & REQ_F_TIMEOUT_NOSEQ) |
1171 | break; | |
bfe68a22 PB |
1172 | if (req->timeout.target_seq != ctx->cached_cq_tail |
1173 | - atomic_read(&ctx->cq_timeouts)) | |
360428f8 | 1174 | break; |
bfe68a22 | 1175 | |
360428f8 | 1176 | list_del_init(&req->list); |
5262f567 | 1177 | io_kill_timeout(req); |
360428f8 PB |
1178 | } |
1179 | } | |
5262f567 | 1180 | |
360428f8 PB |
1181 | static void io_commit_cqring(struct io_ring_ctx *ctx) |
1182 | { | |
1183 | io_flush_timeouts(ctx); | |
de0617e4 JA |
1184 | __io_commit_cqring(ctx); |
1185 | ||
04518945 PB |
1186 | if (unlikely(!list_empty(&ctx->defer_list))) |
1187 | __io_queue_deferred(ctx); | |
de0617e4 JA |
1188 | } |
1189 | ||
2b188cc1 JA |
1190 | static struct io_uring_cqe *io_get_cqring(struct io_ring_ctx *ctx) |
1191 | { | |
75b28aff | 1192 | struct io_rings *rings = ctx->rings; |
2b188cc1 JA |
1193 | unsigned tail; |
1194 | ||
1195 | tail = ctx->cached_cq_tail; | |
115e12e5 SB |
1196 | /* |
1197 | * writes to the cq entry need to come after reading head; the | |
1198 | * control dependency is enough as we're using WRITE_ONCE to | |
1199 | * fill the cq entry | |
1200 | */ | |
75b28aff | 1201 | if (tail - READ_ONCE(rings->cq.head) == rings->cq_ring_entries) |
2b188cc1 JA |
1202 | return NULL; |
1203 | ||
1204 | ctx->cached_cq_tail++; | |
75b28aff | 1205 | return &rings->cqes[tail & ctx->cq_mask]; |
2b188cc1 JA |
1206 | } |
1207 | ||
f2842ab5 JA |
1208 | static inline bool io_should_trigger_evfd(struct io_ring_ctx *ctx) |
1209 | { | |
f0b493e6 JA |
1210 | if (!ctx->cq_ev_fd) |
1211 | return false; | |
7e55a19c SG |
1212 | if (READ_ONCE(ctx->rings->cq_flags) & IORING_CQ_EVENTFD_DISABLED) |
1213 | return false; | |
f2842ab5 JA |
1214 | if (!ctx->eventfd_async) |
1215 | return true; | |
b41e9852 | 1216 | return io_wq_current_is_worker(); |
f2842ab5 JA |
1217 | } |
1218 | ||
b41e9852 | 1219 | static void io_cqring_ev_posted(struct io_ring_ctx *ctx) |
1d7bb1d5 JA |
1220 | { |
1221 | if (waitqueue_active(&ctx->wait)) | |
1222 | wake_up(&ctx->wait); | |
1223 | if (waitqueue_active(&ctx->sqo_wait)) | |
1224 | wake_up(&ctx->sqo_wait); | |
b41e9852 | 1225 | if (io_should_trigger_evfd(ctx)) |
1d7bb1d5 JA |
1226 | eventfd_signal(ctx->cq_ev_fd, 1); |
1227 | } | |
1228 | ||
c4a2ed72 JA |
1229 | /* Returns true if there are no backlogged entries after the flush */ |
1230 | static bool io_cqring_overflow_flush(struct io_ring_ctx *ctx, bool force) | |
1d7bb1d5 JA |
1231 | { |
1232 | struct io_rings *rings = ctx->rings; | |
1233 | struct io_uring_cqe *cqe; | |
1234 | struct io_kiocb *req; | |
1235 | unsigned long flags; | |
1236 | LIST_HEAD(list); | |
1237 | ||
1238 | if (!force) { | |
1239 | if (list_empty_careful(&ctx->cq_overflow_list)) | |
c4a2ed72 | 1240 | return true; |
1d7bb1d5 JA |
1241 | if ((ctx->cached_cq_tail - READ_ONCE(rings->cq.head) == |
1242 | rings->cq_ring_entries)) | |
c4a2ed72 | 1243 | return false; |
1d7bb1d5 JA |
1244 | } |
1245 | ||
1246 | spin_lock_irqsave(&ctx->completion_lock, flags); | |
1247 | ||
1248 | /* if force is set, the ring is going away. always drop after that */ | |
1249 | if (force) | |
69b3e546 | 1250 | ctx->cq_overflow_flushed = 1; |
1d7bb1d5 | 1251 | |
c4a2ed72 | 1252 | cqe = NULL; |
1d7bb1d5 JA |
1253 | while (!list_empty(&ctx->cq_overflow_list)) { |
1254 | cqe = io_get_cqring(ctx); | |
1255 | if (!cqe && !force) | |
1256 | break; | |
1257 | ||
1258 | req = list_first_entry(&ctx->cq_overflow_list, struct io_kiocb, | |
1259 | list); | |
1260 | list_move(&req->list, &list); | |
2ca10259 | 1261 | req->flags &= ~REQ_F_OVERFLOW; |
1d7bb1d5 JA |
1262 | if (cqe) { |
1263 | WRITE_ONCE(cqe->user_data, req->user_data); | |
1264 | WRITE_ONCE(cqe->res, req->result); | |
bcda7baa | 1265 | WRITE_ONCE(cqe->flags, req->cflags); |
1d7bb1d5 JA |
1266 | } else { |
1267 | WRITE_ONCE(ctx->rings->cq_overflow, | |
1268 | atomic_inc_return(&ctx->cached_cq_overflow)); | |
1269 | } | |
1270 | } | |
1271 | ||
1272 | io_commit_cqring(ctx); | |
ad3eb2c8 JA |
1273 | if (cqe) { |
1274 | clear_bit(0, &ctx->sq_check_overflow); | |
1275 | clear_bit(0, &ctx->cq_check_overflow); | |
1276 | } | |
1d7bb1d5 JA |
1277 | spin_unlock_irqrestore(&ctx->completion_lock, flags); |
1278 | io_cqring_ev_posted(ctx); | |
1279 | ||
1280 | while (!list_empty(&list)) { | |
1281 | req = list_first_entry(&list, struct io_kiocb, list); | |
1282 | list_del(&req->list); | |
ec9c02ad | 1283 | io_put_req(req); |
1d7bb1d5 | 1284 | } |
c4a2ed72 JA |
1285 | |
1286 | return cqe != NULL; | |
1d7bb1d5 JA |
1287 | } |
1288 | ||
bcda7baa | 1289 | static void __io_cqring_fill_event(struct io_kiocb *req, long res, long cflags) |
2b188cc1 | 1290 | { |
78e19bbe | 1291 | struct io_ring_ctx *ctx = req->ctx; |
2b188cc1 JA |
1292 | struct io_uring_cqe *cqe; |
1293 | ||
78e19bbe | 1294 | trace_io_uring_complete(ctx, req->user_data, res); |
51c3ff62 | 1295 | |
2b188cc1 JA |
1296 | /* |
1297 | * If we can't get a cq entry, userspace overflowed the | |
1298 | * submission (by quite a lot). Increment the overflow count in | |
1299 | * the ring. | |
1300 | */ | |
1301 | cqe = io_get_cqring(ctx); | |
1d7bb1d5 | 1302 | if (likely(cqe)) { |
78e19bbe | 1303 | WRITE_ONCE(cqe->user_data, req->user_data); |
2b188cc1 | 1304 | WRITE_ONCE(cqe->res, res); |
bcda7baa | 1305 | WRITE_ONCE(cqe->flags, cflags); |
1d7bb1d5 | 1306 | } else if (ctx->cq_overflow_flushed) { |
498ccd9e JA |
1307 | WRITE_ONCE(ctx->rings->cq_overflow, |
1308 | atomic_inc_return(&ctx->cached_cq_overflow)); | |
1d7bb1d5 | 1309 | } else { |
ad3eb2c8 JA |
1310 | if (list_empty(&ctx->cq_overflow_list)) { |
1311 | set_bit(0, &ctx->sq_check_overflow); | |
1312 | set_bit(0, &ctx->cq_check_overflow); | |
1313 | } | |
2ca10259 | 1314 | req->flags |= REQ_F_OVERFLOW; |
1d7bb1d5 JA |
1315 | refcount_inc(&req->refs); |
1316 | req->result = res; | |
bcda7baa | 1317 | req->cflags = cflags; |
1d7bb1d5 | 1318 | list_add_tail(&req->list, &ctx->cq_overflow_list); |
2b188cc1 JA |
1319 | } |
1320 | } | |
1321 | ||
bcda7baa JA |
1322 | static void io_cqring_fill_event(struct io_kiocb *req, long res) |
1323 | { | |
1324 | __io_cqring_fill_event(req, res, 0); | |
1325 | } | |
1326 | ||
1327 | static void __io_cqring_add_event(struct io_kiocb *req, long res, long cflags) | |
2b188cc1 | 1328 | { |
78e19bbe | 1329 | struct io_ring_ctx *ctx = req->ctx; |
2b188cc1 JA |
1330 | unsigned long flags; |
1331 | ||
1332 | spin_lock_irqsave(&ctx->completion_lock, flags); | |
bcda7baa | 1333 | __io_cqring_fill_event(req, res, cflags); |
2b188cc1 JA |
1334 | io_commit_cqring(ctx); |
1335 | spin_unlock_irqrestore(&ctx->completion_lock, flags); | |
1336 | ||
8c838788 | 1337 | io_cqring_ev_posted(ctx); |
2b188cc1 JA |
1338 | } |
1339 | ||
bcda7baa JA |
1340 | static void io_cqring_add_event(struct io_kiocb *req, long res) |
1341 | { | |
1342 | __io_cqring_add_event(req, res, 0); | |
1343 | } | |
1344 | ||
0ddf92e8 JA |
1345 | static inline bool io_is_fallback_req(struct io_kiocb *req) |
1346 | { | |
1347 | return req == (struct io_kiocb *) | |
1348 | ((unsigned long) req->ctx->fallback_req & ~1UL); | |
1349 | } | |
1350 | ||
1351 | static struct io_kiocb *io_get_fallback_req(struct io_ring_ctx *ctx) | |
1352 | { | |
1353 | struct io_kiocb *req; | |
1354 | ||
1355 | req = ctx->fallback_req; | |
dd461af6 | 1356 | if (!test_and_set_bit_lock(0, (unsigned long *) &ctx->fallback_req)) |
0ddf92e8 JA |
1357 | return req; |
1358 | ||
1359 | return NULL; | |
1360 | } | |
1361 | ||
0553b8bd PB |
1362 | static struct io_kiocb *io_alloc_req(struct io_ring_ctx *ctx, |
1363 | struct io_submit_state *state) | |
2b188cc1 | 1364 | { |
fd6fab2c | 1365 | gfp_t gfp = GFP_KERNEL | __GFP_NOWARN; |
2b188cc1 JA |
1366 | struct io_kiocb *req; |
1367 | ||
2579f913 | 1368 | if (!state) { |
fd6fab2c | 1369 | req = kmem_cache_alloc(req_cachep, gfp); |
2579f913 | 1370 | if (unlikely(!req)) |
0ddf92e8 | 1371 | goto fallback; |
2579f913 JA |
1372 | } else if (!state->free_reqs) { |
1373 | size_t sz; | |
1374 | int ret; | |
1375 | ||
1376 | sz = min_t(size_t, state->ios_left, ARRAY_SIZE(state->reqs)); | |
fd6fab2c JA |
1377 | ret = kmem_cache_alloc_bulk(req_cachep, gfp, sz, state->reqs); |
1378 | ||
1379 | /* | |
1380 | * Bulk alloc is all-or-nothing. If we fail to get a batch, | |
1381 | * retry single alloc to be on the safe side. | |
1382 | */ | |
1383 | if (unlikely(ret <= 0)) { | |
1384 | state->reqs[0] = kmem_cache_alloc(req_cachep, gfp); | |
1385 | if (!state->reqs[0]) | |
0ddf92e8 | 1386 | goto fallback; |
fd6fab2c JA |
1387 | ret = 1; |
1388 | } | |
2579f913 | 1389 | state->free_reqs = ret - 1; |
6c8a3134 | 1390 | req = state->reqs[ret - 1]; |
2579f913 | 1391 | } else { |
2579f913 | 1392 | state->free_reqs--; |
6c8a3134 | 1393 | req = state->reqs[state->free_reqs]; |
2b188cc1 JA |
1394 | } |
1395 | ||
2579f913 | 1396 | return req; |
0ddf92e8 | 1397 | fallback: |
0553b8bd | 1398 | return io_get_fallback_req(ctx); |
2b188cc1 JA |
1399 | } |
1400 | ||
8da11c19 PB |
1401 | static inline void io_put_file(struct io_kiocb *req, struct file *file, |
1402 | bool fixed) | |
1403 | { | |
1404 | if (fixed) | |
05589553 | 1405 | percpu_ref_put(req->fixed_file_refs); |
8da11c19 PB |
1406 | else |
1407 | fput(file); | |
1408 | } | |
1409 | ||
c6ca97b3 | 1410 | static void __io_req_aux_free(struct io_kiocb *req) |
2b188cc1 | 1411 | { |
929a3af9 PB |
1412 | if (req->flags & REQ_F_NEED_CLEANUP) |
1413 | io_cleanup_req(req); | |
1414 | ||
96fd84d8 | 1415 | kfree(req->io); |
8da11c19 PB |
1416 | if (req->file) |
1417 | io_put_file(req, req->file, (req->flags & REQ_F_FIXED_FILE)); | |
4dd2824d | 1418 | __io_put_req_task(req); |
cccf0ee8 | 1419 | io_req_work_drop_env(req); |
def596e9 JA |
1420 | } |
1421 | ||
9e645e11 | 1422 | static void __io_free_req(struct io_kiocb *req) |
2b188cc1 | 1423 | { |
c6ca97b3 | 1424 | __io_req_aux_free(req); |
fcb323cc | 1425 | |
fcb323cc | 1426 | if (req->flags & REQ_F_INFLIGHT) { |
c6ca97b3 | 1427 | struct io_ring_ctx *ctx = req->ctx; |
fcb323cc JA |
1428 | unsigned long flags; |
1429 | ||
1430 | spin_lock_irqsave(&ctx->inflight_lock, flags); | |
1431 | list_del(&req->inflight_entry); | |
1432 | if (waitqueue_active(&ctx->inflight_wait)) | |
1433 | wake_up(&ctx->inflight_wait); | |
1434 | spin_unlock_irqrestore(&ctx->inflight_lock, flags); | |
1435 | } | |
2b85edfc PB |
1436 | |
1437 | percpu_ref_put(&req->ctx->refs); | |
b1e50e54 PB |
1438 | if (likely(!io_is_fallback_req(req))) |
1439 | kmem_cache_free(req_cachep, req); | |
1440 | else | |
dd461af6 | 1441 | clear_bit_unlock(0, (unsigned long *) &req->ctx->fallback_req); |
e65ef56d JA |
1442 | } |
1443 | ||
c6ca97b3 JA |
1444 | struct req_batch { |
1445 | void *reqs[IO_IOPOLL_BATCH]; | |
1446 | int to_free; | |
1447 | int need_iter; | |
1448 | }; | |
1449 | ||
1450 | static void io_free_req_many(struct io_ring_ctx *ctx, struct req_batch *rb) | |
1451 | { | |
1452 | if (!rb->to_free) | |
1453 | return; | |
1454 | if (rb->need_iter) { | |
1455 | int i, inflight = 0; | |
1456 | unsigned long flags; | |
1457 | ||
1458 | for (i = 0; i < rb->to_free; i++) { | |
1459 | struct io_kiocb *req = rb->reqs[i]; | |
1460 | ||
c6ca97b3 JA |
1461 | if (req->flags & REQ_F_INFLIGHT) |
1462 | inflight++; | |
c6ca97b3 JA |
1463 | __io_req_aux_free(req); |
1464 | } | |
1465 | if (!inflight) | |
1466 | goto do_free; | |
1467 | ||
1468 | spin_lock_irqsave(&ctx->inflight_lock, flags); | |
1469 | for (i = 0; i < rb->to_free; i++) { | |
1470 | struct io_kiocb *req = rb->reqs[i]; | |
1471 | ||
10fef4be | 1472 | if (req->flags & REQ_F_INFLIGHT) { |
c6ca97b3 JA |
1473 | list_del(&req->inflight_entry); |
1474 | if (!--inflight) | |
1475 | break; | |
1476 | } | |
1477 | } | |
1478 | spin_unlock_irqrestore(&ctx->inflight_lock, flags); | |
1479 | ||
1480 | if (waitqueue_active(&ctx->inflight_wait)) | |
1481 | wake_up(&ctx->inflight_wait); | |
1482 | } | |
1483 | do_free: | |
1484 | kmem_cache_free_bulk(req_cachep, rb->to_free, rb->reqs); | |
1485 | percpu_ref_put_many(&ctx->refs, rb->to_free); | |
c6ca97b3 | 1486 | rb->to_free = rb->need_iter = 0; |
e65ef56d JA |
1487 | } |
1488 | ||
a197f664 | 1489 | static bool io_link_cancel_timeout(struct io_kiocb *req) |
2665abfd | 1490 | { |
a197f664 | 1491 | struct io_ring_ctx *ctx = req->ctx; |
2665abfd JA |
1492 | int ret; |
1493 | ||
2d28390a | 1494 | ret = hrtimer_try_to_cancel(&req->io->timeout.timer); |
2665abfd | 1495 | if (ret != -1) { |
78e19bbe | 1496 | io_cqring_fill_event(req, -ECANCELED); |
2665abfd | 1497 | io_commit_cqring(ctx); |
dea3b49c | 1498 | req->flags &= ~REQ_F_LINK_HEAD; |
ec9c02ad | 1499 | io_put_req(req); |
2665abfd JA |
1500 | return true; |
1501 | } | |
1502 | ||
1503 | return false; | |
e65ef56d JA |
1504 | } |
1505 | ||
ba816ad6 | 1506 | static void io_req_link_next(struct io_kiocb *req, struct io_kiocb **nxtptr) |
9e645e11 | 1507 | { |
2665abfd | 1508 | struct io_ring_ctx *ctx = req->ctx; |
2665abfd | 1509 | bool wake_ev = false; |
9e645e11 | 1510 | |
4d7dd462 JA |
1511 | /* Already got next link */ |
1512 | if (req->flags & REQ_F_LINK_NEXT) | |
1513 | return; | |
1514 | ||
9e645e11 JA |
1515 | /* |
1516 | * The list should never be empty when we are called here. But could | |
1517 | * potentially happen if the chain is messed up, check to be on the | |
1518 | * safe side. | |
1519 | */ | |
4493233e PB |
1520 | while (!list_empty(&req->link_list)) { |
1521 | struct io_kiocb *nxt = list_first_entry(&req->link_list, | |
1522 | struct io_kiocb, link_list); | |
94ae5e77 | 1523 | |
4493233e PB |
1524 | if (unlikely((req->flags & REQ_F_LINK_TIMEOUT) && |
1525 | (nxt->flags & REQ_F_TIMEOUT))) { | |
1526 | list_del_init(&nxt->link_list); | |
94ae5e77 | 1527 | wake_ev |= io_link_cancel_timeout(nxt); |
94ae5e77 JA |
1528 | req->flags &= ~REQ_F_LINK_TIMEOUT; |
1529 | continue; | |
1530 | } | |
9e645e11 | 1531 | |
4493233e PB |
1532 | list_del_init(&req->link_list); |
1533 | if (!list_empty(&nxt->link_list)) | |
dea3b49c | 1534 | nxt->flags |= REQ_F_LINK_HEAD; |
b18fdf71 | 1535 | *nxtptr = nxt; |
94ae5e77 | 1536 | break; |
9e645e11 | 1537 | } |
2665abfd | 1538 | |
4d7dd462 | 1539 | req->flags |= REQ_F_LINK_NEXT; |
2665abfd JA |
1540 | if (wake_ev) |
1541 | io_cqring_ev_posted(ctx); | |
9e645e11 JA |
1542 | } |
1543 | ||
1544 | /* | |
dea3b49c | 1545 | * Called if REQ_F_LINK_HEAD is set, and we fail the head request |
9e645e11 JA |
1546 | */ |
1547 | static void io_fail_links(struct io_kiocb *req) | |
1548 | { | |
2665abfd | 1549 | struct io_ring_ctx *ctx = req->ctx; |
2665abfd JA |
1550 | unsigned long flags; |
1551 | ||
1552 | spin_lock_irqsave(&ctx->completion_lock, flags); | |
9e645e11 JA |
1553 | |
1554 | while (!list_empty(&req->link_list)) { | |
4493233e PB |
1555 | struct io_kiocb *link = list_first_entry(&req->link_list, |
1556 | struct io_kiocb, link_list); | |
9e645e11 | 1557 | |
4493233e | 1558 | list_del_init(&link->link_list); |
c826bd7a | 1559 | trace_io_uring_fail_link(req, link); |
2665abfd JA |
1560 | |
1561 | if ((req->flags & REQ_F_LINK_TIMEOUT) && | |
d625c6ee | 1562 | link->opcode == IORING_OP_LINK_TIMEOUT) { |
a197f664 | 1563 | io_link_cancel_timeout(link); |
2665abfd | 1564 | } else { |
78e19bbe | 1565 | io_cqring_fill_event(link, -ECANCELED); |
978db57e | 1566 | __io_double_put_req(link); |
2665abfd | 1567 | } |
5d960724 | 1568 | req->flags &= ~REQ_F_LINK_TIMEOUT; |
9e645e11 | 1569 | } |
2665abfd JA |
1570 | |
1571 | io_commit_cqring(ctx); | |
1572 | spin_unlock_irqrestore(&ctx->completion_lock, flags); | |
1573 | io_cqring_ev_posted(ctx); | |
9e645e11 JA |
1574 | } |
1575 | ||
4d7dd462 | 1576 | static void io_req_find_next(struct io_kiocb *req, struct io_kiocb **nxt) |
9e645e11 | 1577 | { |
dea3b49c | 1578 | if (likely(!(req->flags & REQ_F_LINK_HEAD))) |
2665abfd | 1579 | return; |
2665abfd | 1580 | |
9e645e11 JA |
1581 | /* |
1582 | * If LINK is set, we have dependent requests in this chain. If we | |
1583 | * didn't fail this request, queue the first one up, moving any other | |
1584 | * dependencies to the next request. In case of failure, fail the rest | |
1585 | * of the chain. | |
1586 | */ | |
2665abfd JA |
1587 | if (req->flags & REQ_F_FAIL_LINK) { |
1588 | io_fail_links(req); | |
7c9e7f0f JA |
1589 | } else if ((req->flags & (REQ_F_LINK_TIMEOUT | REQ_F_COMP_LOCKED)) == |
1590 | REQ_F_LINK_TIMEOUT) { | |
2665abfd JA |
1591 | struct io_ring_ctx *ctx = req->ctx; |
1592 | unsigned long flags; | |
1593 | ||
1594 | /* | |
1595 | * If this is a timeout link, we could be racing with the | |
1596 | * timeout timer. Grab the completion lock for this case to | |
7c9e7f0f | 1597 | * protect against that. |
2665abfd JA |
1598 | */ |
1599 | spin_lock_irqsave(&ctx->completion_lock, flags); | |
1600 | io_req_link_next(req, nxt); | |
1601 | spin_unlock_irqrestore(&ctx->completion_lock, flags); | |
1602 | } else { | |
1603 | io_req_link_next(req, nxt); | |
9e645e11 | 1604 | } |
4d7dd462 | 1605 | } |
9e645e11 | 1606 | |
c69f8dbe JL |
1607 | static void io_free_req(struct io_kiocb *req) |
1608 | { | |
944e58bf PB |
1609 | struct io_kiocb *nxt = NULL; |
1610 | ||
1611 | io_req_find_next(req, &nxt); | |
70cf9f32 | 1612 | __io_free_req(req); |
944e58bf PB |
1613 | |
1614 | if (nxt) | |
1615 | io_queue_async_work(nxt); | |
c69f8dbe JL |
1616 | } |
1617 | ||
7a743e22 PB |
1618 | static void io_wq_assign_next(struct io_wq_work **workptr, struct io_kiocb *nxt) |
1619 | { | |
1620 | struct io_kiocb *link; | |
8766dd51 PB |
1621 | const struct io_op_def *def = &io_op_defs[nxt->opcode]; |
1622 | ||
1623 | if ((nxt->flags & REQ_F_ISREG) && def->hash_reg_file) | |
1624 | io_wq_hash_work(&nxt->work, file_inode(nxt->file)); | |
7a743e22 PB |
1625 | |
1626 | *workptr = &nxt->work; | |
1627 | link = io_prep_linked_timeout(nxt); | |
18a542ff | 1628 | if (link) |
d4c81f38 | 1629 | nxt->flags |= REQ_F_QUEUE_TIMEOUT; |
7a743e22 PB |
1630 | } |
1631 | ||
ba816ad6 JA |
1632 | /* |
1633 | * Drop reference to request, return next in chain (if there is one) if this | |
1634 | * was the last reference to this request. | |
1635 | */ | |
f9bd67f6 | 1636 | __attribute__((nonnull)) |
ec9c02ad | 1637 | static void io_put_req_find_next(struct io_kiocb *req, struct io_kiocb **nxtptr) |
e65ef56d | 1638 | { |
2a44f467 JA |
1639 | if (refcount_dec_and_test(&req->refs)) { |
1640 | io_req_find_next(req, nxtptr); | |
4d7dd462 | 1641 | __io_free_req(req); |
2a44f467 | 1642 | } |
2b188cc1 JA |
1643 | } |
1644 | ||
e65ef56d JA |
1645 | static void io_put_req(struct io_kiocb *req) |
1646 | { | |
1647 | if (refcount_dec_and_test(&req->refs)) | |
1648 | io_free_req(req); | |
2b188cc1 JA |
1649 | } |
1650 | ||
e9fd9396 PB |
1651 | static void io_steal_work(struct io_kiocb *req, |
1652 | struct io_wq_work **workptr) | |
7a743e22 PB |
1653 | { |
1654 | /* | |
1655 | * It's in an io-wq worker, so there always should be at least | |
1656 | * one reference, which will be dropped in io_put_work() just | |
1657 | * after the current handler returns. | |
1658 | * | |
1659 | * It also means, that if the counter dropped to 1, then there is | |
1660 | * no asynchronous users left, so it's safe to steal the next work. | |
1661 | */ | |
7a743e22 PB |
1662 | if (refcount_read(&req->refs) == 1) { |
1663 | struct io_kiocb *nxt = NULL; | |
1664 | ||
1665 | io_req_find_next(req, &nxt); | |
1666 | if (nxt) | |
1667 | io_wq_assign_next(workptr, nxt); | |
1668 | } | |
1669 | } | |
1670 | ||
978db57e JA |
1671 | /* |
1672 | * Must only be used if we don't need to care about links, usually from | |
1673 | * within the completion handling itself. | |
1674 | */ | |
1675 | static void __io_double_put_req(struct io_kiocb *req) | |
78e19bbe JA |
1676 | { |
1677 | /* drop both submit and complete references */ | |
1678 | if (refcount_sub_and_test(2, &req->refs)) | |
1679 | __io_free_req(req); | |
1680 | } | |
1681 | ||
978db57e JA |
1682 | static void io_double_put_req(struct io_kiocb *req) |
1683 | { | |
1684 | /* drop both submit and complete references */ | |
1685 | if (refcount_sub_and_test(2, &req->refs)) | |
1686 | io_free_req(req); | |
1687 | } | |
1688 | ||
1d7bb1d5 | 1689 | static unsigned io_cqring_events(struct io_ring_ctx *ctx, bool noflush) |
a3a0e43f | 1690 | { |
84f97dc2 JA |
1691 | struct io_rings *rings = ctx->rings; |
1692 | ||
ad3eb2c8 JA |
1693 | if (test_bit(0, &ctx->cq_check_overflow)) { |
1694 | /* | |
1695 | * noflush == true is from the waitqueue handler, just ensure | |
1696 | * we wake up the task, and the next invocation will flush the | |
1697 | * entries. We cannot safely to it from here. | |
1698 | */ | |
1699 | if (noflush && !list_empty(&ctx->cq_overflow_list)) | |
1700 | return -1U; | |
1d7bb1d5 | 1701 | |
ad3eb2c8 JA |
1702 | io_cqring_overflow_flush(ctx, false); |
1703 | } | |
1d7bb1d5 | 1704 | |
a3a0e43f JA |
1705 | /* See comment at the top of this file */ |
1706 | smp_rmb(); | |
ad3eb2c8 | 1707 | return ctx->cached_cq_tail - READ_ONCE(rings->cq.head); |
a3a0e43f JA |
1708 | } |
1709 | ||
fb5ccc98 PB |
1710 | static inline unsigned int io_sqring_entries(struct io_ring_ctx *ctx) |
1711 | { | |
1712 | struct io_rings *rings = ctx->rings; | |
1713 | ||
1714 | /* make sure SQ entry isn't read before tail */ | |
1715 | return smp_load_acquire(&rings->sq.tail) - ctx->cached_sq_head; | |
1716 | } | |
1717 | ||
8237e045 | 1718 | static inline bool io_req_multi_free(struct req_batch *rb, struct io_kiocb *req) |
e94f141b | 1719 | { |
dea3b49c | 1720 | if ((req->flags & REQ_F_LINK_HEAD) || io_is_fallback_req(req)) |
c6ca97b3 | 1721 | return false; |
e94f141b | 1722 | |
9d9e88a2 | 1723 | if (req->file || req->io) |
c6ca97b3 JA |
1724 | rb->need_iter++; |
1725 | ||
1726 | rb->reqs[rb->to_free++] = req; | |
1727 | if (unlikely(rb->to_free == ARRAY_SIZE(rb->reqs))) | |
1728 | io_free_req_many(req->ctx, rb); | |
1729 | return true; | |
e94f141b JA |
1730 | } |
1731 | ||
bcda7baa JA |
1732 | static int io_put_kbuf(struct io_kiocb *req) |
1733 | { | |
4d954c25 | 1734 | struct io_buffer *kbuf; |
bcda7baa JA |
1735 | int cflags; |
1736 | ||
4d954c25 | 1737 | kbuf = (struct io_buffer *) (unsigned long) req->rw.addr; |
bcda7baa JA |
1738 | cflags = kbuf->bid << IORING_CQE_BUFFER_SHIFT; |
1739 | cflags |= IORING_CQE_F_BUFFER; | |
1740 | req->rw.addr = 0; | |
1741 | kfree(kbuf); | |
1742 | return cflags; | |
1743 | } | |
1744 | ||
bbde017a XW |
1745 | static void io_iopoll_queue(struct list_head *again) |
1746 | { | |
1747 | struct io_kiocb *req; | |
1748 | ||
1749 | do { | |
1750 | req = list_first_entry(again, struct io_kiocb, list); | |
1751 | list_del(&req->list); | |
1752 | refcount_inc(&req->refs); | |
1753 | io_queue_async_work(req); | |
1754 | } while (!list_empty(again)); | |
1755 | } | |
1756 | ||
def596e9 JA |
1757 | /* |
1758 | * Find and free completed poll iocbs | |
1759 | */ | |
1760 | static void io_iopoll_complete(struct io_ring_ctx *ctx, unsigned int *nr_events, | |
1761 | struct list_head *done) | |
1762 | { | |
8237e045 | 1763 | struct req_batch rb; |
def596e9 | 1764 | struct io_kiocb *req; |
bbde017a XW |
1765 | LIST_HEAD(again); |
1766 | ||
1767 | /* order with ->result store in io_complete_rw_iopoll() */ | |
1768 | smp_rmb(); | |
def596e9 | 1769 | |
c6ca97b3 | 1770 | rb.to_free = rb.need_iter = 0; |
def596e9 | 1771 | while (!list_empty(done)) { |
bcda7baa JA |
1772 | int cflags = 0; |
1773 | ||
def596e9 | 1774 | req = list_first_entry(done, struct io_kiocb, list); |
bbde017a XW |
1775 | if (READ_ONCE(req->result) == -EAGAIN) { |
1776 | req->iopoll_completed = 0; | |
1777 | list_move_tail(&req->list, &again); | |
1778 | continue; | |
1779 | } | |
def596e9 JA |
1780 | list_del(&req->list); |
1781 | ||
bcda7baa JA |
1782 | if (req->flags & REQ_F_BUFFER_SELECTED) |
1783 | cflags = io_put_kbuf(req); | |
1784 | ||
1785 | __io_cqring_fill_event(req, req->result, cflags); | |
def596e9 JA |
1786 | (*nr_events)++; |
1787 | ||
8237e045 JA |
1788 | if (refcount_dec_and_test(&req->refs) && |
1789 | !io_req_multi_free(&rb, req)) | |
1790 | io_free_req(req); | |
def596e9 | 1791 | } |
def596e9 | 1792 | |
09bb8394 | 1793 | io_commit_cqring(ctx); |
32b2244a XW |
1794 | if (ctx->flags & IORING_SETUP_SQPOLL) |
1795 | io_cqring_ev_posted(ctx); | |
8237e045 | 1796 | io_free_req_many(ctx, &rb); |
581f9810 | 1797 | |
bbde017a XW |
1798 | if (!list_empty(&again)) |
1799 | io_iopoll_queue(&again); | |
581f9810 BM |
1800 | } |
1801 | ||
def596e9 JA |
1802 | static int io_do_iopoll(struct io_ring_ctx *ctx, unsigned int *nr_events, |
1803 | long min) | |
1804 | { | |
1805 | struct io_kiocb *req, *tmp; | |
1806 | LIST_HEAD(done); | |
1807 | bool spin; | |
1808 | int ret; | |
1809 | ||
1810 | /* | |
1811 | * Only spin for completions if we don't have multiple devices hanging | |
1812 | * off our complete list, and we're under the requested amount. | |
1813 | */ | |
1814 | spin = !ctx->poll_multi_file && *nr_events < min; | |
1815 | ||
1816 | ret = 0; | |
1817 | list_for_each_entry_safe(req, tmp, &ctx->poll_list, list) { | |
9adbd45d | 1818 | struct kiocb *kiocb = &req->rw.kiocb; |
def596e9 JA |
1819 | |
1820 | /* | |
581f9810 BM |
1821 | * Move completed and retryable entries to our local lists. |
1822 | * If we find a request that requires polling, break out | |
1823 | * and complete those lists first, if we have entries there. | |
def596e9 | 1824 | */ |
65a6543d | 1825 | if (READ_ONCE(req->iopoll_completed)) { |
def596e9 JA |
1826 | list_move_tail(&req->list, &done); |
1827 | continue; | |
1828 | } | |
1829 | if (!list_empty(&done)) | |
1830 | break; | |
1831 | ||
1832 | ret = kiocb->ki_filp->f_op->iopoll(kiocb, spin); | |
1833 | if (ret < 0) | |
1834 | break; | |
1835 | ||
1836 | if (ret && spin) | |
1837 | spin = false; | |
1838 | ret = 0; | |
1839 | } | |
1840 | ||
1841 | if (!list_empty(&done)) | |
1842 | io_iopoll_complete(ctx, nr_events, &done); | |
1843 | ||
1844 | return ret; | |
1845 | } | |
1846 | ||
1847 | /* | |
d195a66e | 1848 | * Poll for a minimum of 'min' events. Note that if min == 0 we consider that a |
def596e9 JA |
1849 | * non-spinning poll check - we'll still enter the driver poll loop, but only |
1850 | * as a non-spinning completion check. | |
1851 | */ | |
1852 | static int io_iopoll_getevents(struct io_ring_ctx *ctx, unsigned int *nr_events, | |
1853 | long min) | |
1854 | { | |
08f5439f | 1855 | while (!list_empty(&ctx->poll_list) && !need_resched()) { |
def596e9 JA |
1856 | int ret; |
1857 | ||
1858 | ret = io_do_iopoll(ctx, nr_events, min); | |
1859 | if (ret < 0) | |
1860 | return ret; | |
1861 | if (!min || *nr_events >= min) | |
1862 | return 0; | |
1863 | } | |
1864 | ||
1865 | return 1; | |
1866 | } | |
1867 | ||
1868 | /* | |
1869 | * We can't just wait for polled events to come to us, we have to actively | |
1870 | * find and complete them. | |
1871 | */ | |
1872 | static void io_iopoll_reap_events(struct io_ring_ctx *ctx) | |
1873 | { | |
1874 | if (!(ctx->flags & IORING_SETUP_IOPOLL)) | |
1875 | return; | |
1876 | ||
1877 | mutex_lock(&ctx->uring_lock); | |
1878 | while (!list_empty(&ctx->poll_list)) { | |
1879 | unsigned int nr_events = 0; | |
1880 | ||
1881 | io_iopoll_getevents(ctx, &nr_events, 1); | |
08f5439f JA |
1882 | |
1883 | /* | |
1884 | * Ensure we allow local-to-the-cpu processing to take place, | |
1885 | * in this case we need to ensure that we reap all events. | |
1886 | */ | |
1887 | cond_resched(); | |
def596e9 JA |
1888 | } |
1889 | mutex_unlock(&ctx->uring_lock); | |
1890 | } | |
1891 | ||
c7849be9 XW |
1892 | static int io_iopoll_check(struct io_ring_ctx *ctx, unsigned *nr_events, |
1893 | long min) | |
def596e9 | 1894 | { |
2b2ed975 | 1895 | int iters = 0, ret = 0; |
500f9fba | 1896 | |
c7849be9 XW |
1897 | /* |
1898 | * We disallow the app entering submit/complete with polling, but we | |
1899 | * still need to lock the ring to prevent racing with polled issue | |
1900 | * that got punted to a workqueue. | |
1901 | */ | |
1902 | mutex_lock(&ctx->uring_lock); | |
def596e9 JA |
1903 | do { |
1904 | int tmin = 0; | |
1905 | ||
a3a0e43f JA |
1906 | /* |
1907 | * Don't enter poll loop if we already have events pending. | |
1908 | * If we do, we can potentially be spinning for commands that | |
1909 | * already triggered a CQE (eg in error). | |
1910 | */ | |
1d7bb1d5 | 1911 | if (io_cqring_events(ctx, false)) |
a3a0e43f JA |
1912 | break; |
1913 | ||
500f9fba JA |
1914 | /* |
1915 | * If a submit got punted to a workqueue, we can have the | |
1916 | * application entering polling for a command before it gets | |
1917 | * issued. That app will hold the uring_lock for the duration | |
1918 | * of the poll right here, so we need to take a breather every | |
1919 | * now and then to ensure that the issue has a chance to add | |
1920 | * the poll to the issued list. Otherwise we can spin here | |
1921 | * forever, while the workqueue is stuck trying to acquire the | |
1922 | * very same mutex. | |
1923 | */ | |
1924 | if (!(++iters & 7)) { | |
1925 | mutex_unlock(&ctx->uring_lock); | |
1926 | mutex_lock(&ctx->uring_lock); | |
1927 | } | |
1928 | ||
def596e9 JA |
1929 | if (*nr_events < min) |
1930 | tmin = min - *nr_events; | |
1931 | ||
1932 | ret = io_iopoll_getevents(ctx, nr_events, tmin); | |
1933 | if (ret <= 0) | |
1934 | break; | |
1935 | ret = 0; | |
1936 | } while (min && !*nr_events && !need_resched()); | |
1937 | ||
500f9fba | 1938 | mutex_unlock(&ctx->uring_lock); |
def596e9 JA |
1939 | return ret; |
1940 | } | |
1941 | ||
491381ce | 1942 | static void kiocb_end_write(struct io_kiocb *req) |
2b188cc1 | 1943 | { |
491381ce JA |
1944 | /* |
1945 | * Tell lockdep we inherited freeze protection from submission | |
1946 | * thread. | |
1947 | */ | |
1948 | if (req->flags & REQ_F_ISREG) { | |
1949 | struct inode *inode = file_inode(req->file); | |
2b188cc1 | 1950 | |
491381ce | 1951 | __sb_writers_acquired(inode->i_sb, SB_FREEZE_WRITE); |
2b188cc1 | 1952 | } |
491381ce | 1953 | file_end_write(req->file); |
2b188cc1 JA |
1954 | } |
1955 | ||
4e88d6e7 JA |
1956 | static inline void req_set_fail_links(struct io_kiocb *req) |
1957 | { | |
1958 | if ((req->flags & (REQ_F_LINK | REQ_F_HARDLINK)) == REQ_F_LINK) | |
1959 | req->flags |= REQ_F_FAIL_LINK; | |
1960 | } | |
1961 | ||
ba816ad6 | 1962 | static void io_complete_rw_common(struct kiocb *kiocb, long res) |
2b188cc1 | 1963 | { |
9adbd45d | 1964 | struct io_kiocb *req = container_of(kiocb, struct io_kiocb, rw.kiocb); |
bcda7baa | 1965 | int cflags = 0; |
2b188cc1 | 1966 | |
491381ce JA |
1967 | if (kiocb->ki_flags & IOCB_WRITE) |
1968 | kiocb_end_write(req); | |
2b188cc1 | 1969 | |
4e88d6e7 JA |
1970 | if (res != req->result) |
1971 | req_set_fail_links(req); | |
bcda7baa JA |
1972 | if (req->flags & REQ_F_BUFFER_SELECTED) |
1973 | cflags = io_put_kbuf(req); | |
1974 | __io_cqring_add_event(req, res, cflags); | |
ba816ad6 JA |
1975 | } |
1976 | ||
1977 | static void io_complete_rw(struct kiocb *kiocb, long res, long res2) | |
1978 | { | |
9adbd45d | 1979 | struct io_kiocb *req = container_of(kiocb, struct io_kiocb, rw.kiocb); |
ba816ad6 JA |
1980 | |
1981 | io_complete_rw_common(kiocb, res); | |
e65ef56d | 1982 | io_put_req(req); |
2b188cc1 JA |
1983 | } |
1984 | ||
def596e9 JA |
1985 | static void io_complete_rw_iopoll(struct kiocb *kiocb, long res, long res2) |
1986 | { | |
9adbd45d | 1987 | struct io_kiocb *req = container_of(kiocb, struct io_kiocb, rw.kiocb); |
def596e9 | 1988 | |
491381ce JA |
1989 | if (kiocb->ki_flags & IOCB_WRITE) |
1990 | kiocb_end_write(req); | |
def596e9 | 1991 | |
2d7d6792 | 1992 | if (res != -EAGAIN && res != req->result) |
4e88d6e7 | 1993 | req_set_fail_links(req); |
bbde017a XW |
1994 | |
1995 | WRITE_ONCE(req->result, res); | |
1996 | /* order with io_poll_complete() checking ->result */ | |
1997 | if (res != -EAGAIN) { | |
1998 | smp_wmb(); | |
65a6543d | 1999 | WRITE_ONCE(req->iopoll_completed, 1); |
bbde017a | 2000 | } |
def596e9 JA |
2001 | } |
2002 | ||
2003 | /* | |
2004 | * After the iocb has been issued, it's safe to be found on the poll list. | |
2005 | * Adding the kiocb to the list AFTER submission ensures that we don't | |
2006 | * find it from a io_iopoll_getevents() thread before the issuer is done | |
2007 | * accessing the kiocb cookie. | |
2008 | */ | |
2009 | static void io_iopoll_req_issued(struct io_kiocb *req) | |
2010 | { | |
2011 | struct io_ring_ctx *ctx = req->ctx; | |
2012 | ||
2013 | /* | |
2014 | * Track whether we have multiple files in our lists. This will impact | |
2015 | * how we do polling eventually, not spinning if we're on potentially | |
2016 | * different devices. | |
2017 | */ | |
2018 | if (list_empty(&ctx->poll_list)) { | |
2019 | ctx->poll_multi_file = false; | |
2020 | } else if (!ctx->poll_multi_file) { | |
2021 | struct io_kiocb *list_req; | |
2022 | ||
2023 | list_req = list_first_entry(&ctx->poll_list, struct io_kiocb, | |
2024 | list); | |
9adbd45d | 2025 | if (list_req->file != req->file) |
def596e9 JA |
2026 | ctx->poll_multi_file = true; |
2027 | } | |
2028 | ||
2029 | /* | |
2030 | * For fast devices, IO may have already completed. If it has, add | |
2031 | * it to the front so we find it first. | |
2032 | */ | |
65a6543d | 2033 | if (READ_ONCE(req->iopoll_completed)) |
def596e9 JA |
2034 | list_add(&req->list, &ctx->poll_list); |
2035 | else | |
2036 | list_add_tail(&req->list, &ctx->poll_list); | |
bdcd3eab XW |
2037 | |
2038 | if ((ctx->flags & IORING_SETUP_SQPOLL) && | |
2039 | wq_has_sleeper(&ctx->sqo_wait)) | |
2040 | wake_up(&ctx->sqo_wait); | |
def596e9 JA |
2041 | } |
2042 | ||
9f13c35b | 2043 | static void __io_state_file_put(struct io_submit_state *state) |
9a56a232 | 2044 | { |
9f13c35b | 2045 | int diff = state->has_refs - state->used_refs; |
9a56a232 | 2046 | |
9f13c35b PB |
2047 | if (diff) |
2048 | fput_many(state->file, diff); | |
2049 | state->file = NULL; | |
2050 | } | |
2051 | ||
2052 | static inline void io_state_file_put(struct io_submit_state *state) | |
2053 | { | |
2054 | if (state->file) | |
2055 | __io_state_file_put(state); | |
9a56a232 JA |
2056 | } |
2057 | ||
2058 | /* | |
2059 | * Get as many references to a file as we have IOs left in this submission, | |
2060 | * assuming most submissions are for one file, or at least that each file | |
2061 | * has more than one submission. | |
2062 | */ | |
8da11c19 | 2063 | static struct file *__io_file_get(struct io_submit_state *state, int fd) |
9a56a232 JA |
2064 | { |
2065 | if (!state) | |
2066 | return fget(fd); | |
2067 | ||
2068 | if (state->file) { | |
2069 | if (state->fd == fd) { | |
2070 | state->used_refs++; | |
2071 | state->ios_left--; | |
2072 | return state->file; | |
2073 | } | |
9f13c35b | 2074 | __io_state_file_put(state); |
9a56a232 JA |
2075 | } |
2076 | state->file = fget_many(fd, state->ios_left); | |
2077 | if (!state->file) | |
2078 | return NULL; | |
2079 | ||
2080 | state->fd = fd; | |
2081 | state->has_refs = state->ios_left; | |
2082 | state->used_refs = 1; | |
2083 | state->ios_left--; | |
2084 | return state->file; | |
2085 | } | |
2086 | ||
2b188cc1 JA |
2087 | /* |
2088 | * If we tracked the file through the SCM inflight mechanism, we could support | |
2089 | * any file. For now, just ensure that anything potentially problematic is done | |
2090 | * inline. | |
2091 | */ | |
af197f50 | 2092 | static bool io_file_supports_async(struct file *file, int rw) |
2b188cc1 JA |
2093 | { |
2094 | umode_t mode = file_inode(file)->i_mode; | |
2095 | ||
10d59345 | 2096 | if (S_ISBLK(mode) || S_ISCHR(mode) || S_ISSOCK(mode)) |
2b188cc1 JA |
2097 | return true; |
2098 | if (S_ISREG(mode) && file->f_op != &io_uring_fops) | |
2099 | return true; | |
2100 | ||
c5b85625 JA |
2101 | /* any ->read/write should understand O_NONBLOCK */ |
2102 | if (file->f_flags & O_NONBLOCK) | |
2103 | return true; | |
2104 | ||
af197f50 JA |
2105 | if (!(file->f_mode & FMODE_NOWAIT)) |
2106 | return false; | |
2107 | ||
2108 | if (rw == READ) | |
2109 | return file->f_op->read_iter != NULL; | |
2110 | ||
2111 | return file->f_op->write_iter != NULL; | |
2b188cc1 JA |
2112 | } |
2113 | ||
3529d8c2 JA |
2114 | static int io_prep_rw(struct io_kiocb *req, const struct io_uring_sqe *sqe, |
2115 | bool force_nonblock) | |
2b188cc1 | 2116 | { |
def596e9 | 2117 | struct io_ring_ctx *ctx = req->ctx; |
9adbd45d | 2118 | struct kiocb *kiocb = &req->rw.kiocb; |
09bb8394 JA |
2119 | unsigned ioprio; |
2120 | int ret; | |
2b188cc1 | 2121 | |
491381ce JA |
2122 | if (S_ISREG(file_inode(req->file)->i_mode)) |
2123 | req->flags |= REQ_F_ISREG; | |
2124 | ||
2b188cc1 | 2125 | kiocb->ki_pos = READ_ONCE(sqe->off); |
ba04291e JA |
2126 | if (kiocb->ki_pos == -1 && !(req->file->f_mode & FMODE_STREAM)) { |
2127 | req->flags |= REQ_F_CUR_POS; | |
2128 | kiocb->ki_pos = req->file->f_pos; | |
2129 | } | |
2b188cc1 | 2130 | kiocb->ki_hint = ki_hint_validate(file_write_hint(kiocb->ki_filp)); |
3e577dcd PB |
2131 | kiocb->ki_flags = iocb_flags(kiocb->ki_filp); |
2132 | ret = kiocb_set_rw_flags(kiocb, READ_ONCE(sqe->rw_flags)); | |
2133 | if (unlikely(ret)) | |
2134 | return ret; | |
2b188cc1 JA |
2135 | |
2136 | ioprio = READ_ONCE(sqe->ioprio); | |
2137 | if (ioprio) { | |
2138 | ret = ioprio_check_cap(ioprio); | |
2139 | if (ret) | |
09bb8394 | 2140 | return ret; |
2b188cc1 JA |
2141 | |
2142 | kiocb->ki_ioprio = ioprio; | |
2143 | } else | |
2144 | kiocb->ki_ioprio = get_current_ioprio(); | |
2145 | ||
8449eeda | 2146 | /* don't allow async punt if RWF_NOWAIT was requested */ |
c5b85625 | 2147 | if (kiocb->ki_flags & IOCB_NOWAIT) |
8449eeda SB |
2148 | req->flags |= REQ_F_NOWAIT; |
2149 | ||
2150 | if (force_nonblock) | |
2b188cc1 | 2151 | kiocb->ki_flags |= IOCB_NOWAIT; |
8449eeda | 2152 | |
def596e9 | 2153 | if (ctx->flags & IORING_SETUP_IOPOLL) { |
def596e9 JA |
2154 | if (!(kiocb->ki_flags & IOCB_DIRECT) || |
2155 | !kiocb->ki_filp->f_op->iopoll) | |
09bb8394 | 2156 | return -EOPNOTSUPP; |
2b188cc1 | 2157 | |
def596e9 JA |
2158 | kiocb->ki_flags |= IOCB_HIPRI; |
2159 | kiocb->ki_complete = io_complete_rw_iopoll; | |
6873e0bd | 2160 | req->result = 0; |
65a6543d | 2161 | req->iopoll_completed = 0; |
def596e9 | 2162 | } else { |
09bb8394 JA |
2163 | if (kiocb->ki_flags & IOCB_HIPRI) |
2164 | return -EINVAL; | |
def596e9 JA |
2165 | kiocb->ki_complete = io_complete_rw; |
2166 | } | |
9adbd45d | 2167 | |
3529d8c2 JA |
2168 | req->rw.addr = READ_ONCE(sqe->addr); |
2169 | req->rw.len = READ_ONCE(sqe->len); | |
4f4eeba8 | 2170 | req->buf_index = READ_ONCE(sqe->buf_index); |
2b188cc1 | 2171 | return 0; |
2b188cc1 JA |
2172 | } |
2173 | ||
2174 | static inline void io_rw_done(struct kiocb *kiocb, ssize_t ret) | |
2175 | { | |
2176 | switch (ret) { | |
2177 | case -EIOCBQUEUED: | |
2178 | break; | |
2179 | case -ERESTARTSYS: | |
2180 | case -ERESTARTNOINTR: | |
2181 | case -ERESTARTNOHAND: | |
2182 | case -ERESTART_RESTARTBLOCK: | |
2183 | /* | |
2184 | * We can't just restart the syscall, since previously | |
2185 | * submitted sqes may already be in progress. Just fail this | |
2186 | * IO with EINTR. | |
2187 | */ | |
2188 | ret = -EINTR; | |
2189 | /* fall through */ | |
2190 | default: | |
2191 | kiocb->ki_complete(kiocb, ret, 0); | |
2192 | } | |
2193 | } | |
2194 | ||
014db007 | 2195 | static void kiocb_done(struct kiocb *kiocb, ssize_t ret) |
ba816ad6 | 2196 | { |
ba04291e JA |
2197 | struct io_kiocb *req = container_of(kiocb, struct io_kiocb, rw.kiocb); |
2198 | ||
2199 | if (req->flags & REQ_F_CUR_POS) | |
2200 | req->file->f_pos = kiocb->ki_pos; | |
bcaec089 | 2201 | if (ret >= 0 && kiocb->ki_complete == io_complete_rw) |
014db007 | 2202 | io_complete_rw(kiocb, ret, 0); |
ba816ad6 JA |
2203 | else |
2204 | io_rw_done(kiocb, ret); | |
2205 | } | |
2206 | ||
9adbd45d | 2207 | static ssize_t io_import_fixed(struct io_kiocb *req, int rw, |
7d009165 | 2208 | struct iov_iter *iter) |
edafccee | 2209 | { |
9adbd45d JA |
2210 | struct io_ring_ctx *ctx = req->ctx; |
2211 | size_t len = req->rw.len; | |
edafccee | 2212 | struct io_mapped_ubuf *imu; |
4f4eeba8 | 2213 | u16 index, buf_index; |
edafccee JA |
2214 | size_t offset; |
2215 | u64 buf_addr; | |
2216 | ||
2217 | /* attempt to use fixed buffers without having provided iovecs */ | |
2218 | if (unlikely(!ctx->user_bufs)) | |
2219 | return -EFAULT; | |
2220 | ||
4f4eeba8 | 2221 | buf_index = req->buf_index; |
edafccee JA |
2222 | if (unlikely(buf_index >= ctx->nr_user_bufs)) |
2223 | return -EFAULT; | |
2224 | ||
2225 | index = array_index_nospec(buf_index, ctx->nr_user_bufs); | |
2226 | imu = &ctx->user_bufs[index]; | |
9adbd45d | 2227 | buf_addr = req->rw.addr; |
edafccee JA |
2228 | |
2229 | /* overflow */ | |
2230 | if (buf_addr + len < buf_addr) | |
2231 | return -EFAULT; | |
2232 | /* not inside the mapped region */ | |
2233 | if (buf_addr < imu->ubuf || buf_addr + len > imu->ubuf + imu->len) | |
2234 | return -EFAULT; | |
2235 | ||
2236 | /* | |
2237 | * May not be a start of buffer, set size appropriately | |
2238 | * and advance us to the beginning. | |
2239 | */ | |
2240 | offset = buf_addr - imu->ubuf; | |
2241 | iov_iter_bvec(iter, rw, imu->bvec, imu->nr_bvecs, offset + len); | |
bd11b3a3 JA |
2242 | |
2243 | if (offset) { | |
2244 | /* | |
2245 | * Don't use iov_iter_advance() here, as it's really slow for | |
2246 | * using the latter parts of a big fixed buffer - it iterates | |
2247 | * over each segment manually. We can cheat a bit here, because | |
2248 | * we know that: | |
2249 | * | |
2250 | * 1) it's a BVEC iter, we set it up | |
2251 | * 2) all bvecs are PAGE_SIZE in size, except potentially the | |
2252 | * first and last bvec | |
2253 | * | |
2254 | * So just find our index, and adjust the iterator afterwards. | |
2255 | * If the offset is within the first bvec (or the whole first | |
2256 | * bvec, just use iov_iter_advance(). This makes it easier | |
2257 | * since we can just skip the first segment, which may not | |
2258 | * be PAGE_SIZE aligned. | |
2259 | */ | |
2260 | const struct bio_vec *bvec = imu->bvec; | |
2261 | ||
2262 | if (offset <= bvec->bv_len) { | |
2263 | iov_iter_advance(iter, offset); | |
2264 | } else { | |
2265 | unsigned long seg_skip; | |
2266 | ||
2267 | /* skip first vec */ | |
2268 | offset -= bvec->bv_len; | |
2269 | seg_skip = 1 + (offset >> PAGE_SHIFT); | |
2270 | ||
2271 | iter->bvec = bvec + seg_skip; | |
2272 | iter->nr_segs -= seg_skip; | |
99c79f66 | 2273 | iter->count -= bvec->bv_len + offset; |
bd11b3a3 | 2274 | iter->iov_offset = offset & ~PAGE_MASK; |
bd11b3a3 JA |
2275 | } |
2276 | } | |
2277 | ||
5e559561 | 2278 | return len; |
edafccee JA |
2279 | } |
2280 | ||
bcda7baa JA |
2281 | static void io_ring_submit_unlock(struct io_ring_ctx *ctx, bool needs_lock) |
2282 | { | |
2283 | if (needs_lock) | |
2284 | mutex_unlock(&ctx->uring_lock); | |
2285 | } | |
2286 | ||
2287 | static void io_ring_submit_lock(struct io_ring_ctx *ctx, bool needs_lock) | |
2288 | { | |
2289 | /* | |
2290 | * "Normal" inline submissions always hold the uring_lock, since we | |
2291 | * grab it from the system call. Same is true for the SQPOLL offload. | |
2292 | * The only exception is when we've detached the request and issue it | |
2293 | * from an async worker thread, grab the lock for that case. | |
2294 | */ | |
2295 | if (needs_lock) | |
2296 | mutex_lock(&ctx->uring_lock); | |
2297 | } | |
2298 | ||
2299 | static struct io_buffer *io_buffer_select(struct io_kiocb *req, size_t *len, | |
2300 | int bgid, struct io_buffer *kbuf, | |
2301 | bool needs_lock) | |
2302 | { | |
2303 | struct io_buffer *head; | |
2304 | ||
2305 | if (req->flags & REQ_F_BUFFER_SELECTED) | |
2306 | return kbuf; | |
2307 | ||
2308 | io_ring_submit_lock(req->ctx, needs_lock); | |
2309 | ||
2310 | lockdep_assert_held(&req->ctx->uring_lock); | |
2311 | ||
2312 | head = idr_find(&req->ctx->io_buffer_idr, bgid); | |
2313 | if (head) { | |
2314 | if (!list_empty(&head->list)) { | |
2315 | kbuf = list_last_entry(&head->list, struct io_buffer, | |
2316 | list); | |
2317 | list_del(&kbuf->list); | |
2318 | } else { | |
2319 | kbuf = head; | |
2320 | idr_remove(&req->ctx->io_buffer_idr, bgid); | |
2321 | } | |
2322 | if (*len > kbuf->len) | |
2323 | *len = kbuf->len; | |
2324 | } else { | |
2325 | kbuf = ERR_PTR(-ENOBUFS); | |
2326 | } | |
2327 | ||
2328 | io_ring_submit_unlock(req->ctx, needs_lock); | |
2329 | ||
2330 | return kbuf; | |
2331 | } | |
2332 | ||
4d954c25 JA |
2333 | static void __user *io_rw_buffer_select(struct io_kiocb *req, size_t *len, |
2334 | bool needs_lock) | |
2335 | { | |
2336 | struct io_buffer *kbuf; | |
4f4eeba8 | 2337 | u16 bgid; |
4d954c25 JA |
2338 | |
2339 | kbuf = (struct io_buffer *) (unsigned long) req->rw.addr; | |
4f4eeba8 | 2340 | bgid = req->buf_index; |
4d954c25 JA |
2341 | kbuf = io_buffer_select(req, len, bgid, kbuf, needs_lock); |
2342 | if (IS_ERR(kbuf)) | |
2343 | return kbuf; | |
2344 | req->rw.addr = (u64) (unsigned long) kbuf; | |
2345 | req->flags |= REQ_F_BUFFER_SELECTED; | |
2346 | return u64_to_user_ptr(kbuf->addr); | |
2347 | } | |
2348 | ||
2349 | #ifdef CONFIG_COMPAT | |
2350 | static ssize_t io_compat_import(struct io_kiocb *req, struct iovec *iov, | |
2351 | bool needs_lock) | |
2352 | { | |
2353 | struct compat_iovec __user *uiov; | |
2354 | compat_ssize_t clen; | |
2355 | void __user *buf; | |
2356 | ssize_t len; | |
2357 | ||
2358 | uiov = u64_to_user_ptr(req->rw.addr); | |
2359 | if (!access_ok(uiov, sizeof(*uiov))) | |
2360 | return -EFAULT; | |
2361 | if (__get_user(clen, &uiov->iov_len)) | |
2362 | return -EFAULT; | |
2363 | if (clen < 0) | |
2364 | return -EINVAL; | |
2365 | ||
2366 | len = clen; | |
2367 | buf = io_rw_buffer_select(req, &len, needs_lock); | |
2368 | if (IS_ERR(buf)) | |
2369 | return PTR_ERR(buf); | |
2370 | iov[0].iov_base = buf; | |
2371 | iov[0].iov_len = (compat_size_t) len; | |
2372 | return 0; | |
2373 | } | |
2374 | #endif | |
2375 | ||
2376 | static ssize_t __io_iov_buffer_select(struct io_kiocb *req, struct iovec *iov, | |
2377 | bool needs_lock) | |
2378 | { | |
2379 | struct iovec __user *uiov = u64_to_user_ptr(req->rw.addr); | |
2380 | void __user *buf; | |
2381 | ssize_t len; | |
2382 | ||
2383 | if (copy_from_user(iov, uiov, sizeof(*uiov))) | |
2384 | return -EFAULT; | |
2385 | ||
2386 | len = iov[0].iov_len; | |
2387 | if (len < 0) | |
2388 | return -EINVAL; | |
2389 | buf = io_rw_buffer_select(req, &len, needs_lock); | |
2390 | if (IS_ERR(buf)) | |
2391 | return PTR_ERR(buf); | |
2392 | iov[0].iov_base = buf; | |
2393 | iov[0].iov_len = len; | |
2394 | return 0; | |
2395 | } | |
2396 | ||
2397 | static ssize_t io_iov_buffer_select(struct io_kiocb *req, struct iovec *iov, | |
2398 | bool needs_lock) | |
2399 | { | |
dddb3e26 JA |
2400 | if (req->flags & REQ_F_BUFFER_SELECTED) { |
2401 | struct io_buffer *kbuf; | |
2402 | ||
2403 | kbuf = (struct io_buffer *) (unsigned long) req->rw.addr; | |
2404 | iov[0].iov_base = u64_to_user_ptr(kbuf->addr); | |
2405 | iov[0].iov_len = kbuf->len; | |
4d954c25 | 2406 | return 0; |
dddb3e26 | 2407 | } |
4d954c25 JA |
2408 | if (!req->rw.len) |
2409 | return 0; | |
2410 | else if (req->rw.len > 1) | |
2411 | return -EINVAL; | |
2412 | ||
2413 | #ifdef CONFIG_COMPAT | |
2414 | if (req->ctx->compat) | |
2415 | return io_compat_import(req, iov, needs_lock); | |
2416 | #endif | |
2417 | ||
2418 | return __io_iov_buffer_select(req, iov, needs_lock); | |
2419 | } | |
2420 | ||
cf6fd4bd | 2421 | static ssize_t io_import_iovec(int rw, struct io_kiocb *req, |
bcda7baa JA |
2422 | struct iovec **iovec, struct iov_iter *iter, |
2423 | bool needs_lock) | |
2b188cc1 | 2424 | { |
9adbd45d JA |
2425 | void __user *buf = u64_to_user_ptr(req->rw.addr); |
2426 | size_t sqe_len = req->rw.len; | |
4d954c25 | 2427 | ssize_t ret; |
edafccee JA |
2428 | u8 opcode; |
2429 | ||
d625c6ee | 2430 | opcode = req->opcode; |
7d009165 | 2431 | if (opcode == IORING_OP_READ_FIXED || opcode == IORING_OP_WRITE_FIXED) { |
edafccee | 2432 | *iovec = NULL; |
9adbd45d | 2433 | return io_import_fixed(req, rw, iter); |
edafccee | 2434 | } |
2b188cc1 | 2435 | |
bcda7baa | 2436 | /* buffer index only valid with fixed read/write, or buffer select */ |
4f4eeba8 | 2437 | if (req->buf_index && !(req->flags & REQ_F_BUFFER_SELECT)) |
9adbd45d JA |
2438 | return -EINVAL; |
2439 | ||
3a6820f2 | 2440 | if (opcode == IORING_OP_READ || opcode == IORING_OP_WRITE) { |
bcda7baa | 2441 | if (req->flags & REQ_F_BUFFER_SELECT) { |
4d954c25 JA |
2442 | buf = io_rw_buffer_select(req, &sqe_len, needs_lock); |
2443 | if (IS_ERR(buf)) { | |
bcda7baa | 2444 | *iovec = NULL; |
4d954c25 | 2445 | return PTR_ERR(buf); |
bcda7baa | 2446 | } |
3f9d6441 | 2447 | req->rw.len = sqe_len; |
bcda7baa JA |
2448 | } |
2449 | ||
3a6820f2 JA |
2450 | ret = import_single_range(rw, buf, sqe_len, *iovec, iter); |
2451 | *iovec = NULL; | |
3a901598 | 2452 | return ret < 0 ? ret : sqe_len; |
3a6820f2 JA |
2453 | } |
2454 | ||
f67676d1 JA |
2455 | if (req->io) { |
2456 | struct io_async_rw *iorw = &req->io->rw; | |
2457 | ||
2458 | *iovec = iorw->iov; | |
2459 | iov_iter_init(iter, rw, *iovec, iorw->nr_segs, iorw->size); | |
2460 | if (iorw->iov == iorw->fast_iov) | |
2461 | *iovec = NULL; | |
2462 | return iorw->size; | |
2463 | } | |
2464 | ||
4d954c25 JA |
2465 | if (req->flags & REQ_F_BUFFER_SELECT) { |
2466 | ret = io_iov_buffer_select(req, *iovec, needs_lock); | |
3f9d6441 JA |
2467 | if (!ret) { |
2468 | ret = (*iovec)->iov_len; | |
2469 | iov_iter_init(iter, rw, *iovec, 1, ret); | |
2470 | } | |
4d954c25 JA |
2471 | *iovec = NULL; |
2472 | return ret; | |
2473 | } | |
2474 | ||
2b188cc1 | 2475 | #ifdef CONFIG_COMPAT |
cf6fd4bd | 2476 | if (req->ctx->compat) |
2b188cc1 JA |
2477 | return compat_import_iovec(rw, buf, sqe_len, UIO_FASTIOV, |
2478 | iovec, iter); | |
2479 | #endif | |
2480 | ||
2481 | return import_iovec(rw, buf, sqe_len, UIO_FASTIOV, iovec, iter); | |
2482 | } | |
2483 | ||
31b51510 | 2484 | /* |
32960613 JA |
2485 | * For files that don't have ->read_iter() and ->write_iter(), handle them |
2486 | * by looping over ->read() or ->write() manually. | |
31b51510 | 2487 | */ |
32960613 JA |
2488 | static ssize_t loop_rw_iter(int rw, struct file *file, struct kiocb *kiocb, |
2489 | struct iov_iter *iter) | |
2490 | { | |
2491 | ssize_t ret = 0; | |
2492 | ||
2493 | /* | |
2494 | * Don't support polled IO through this interface, and we can't | |
2495 | * support non-blocking either. For the latter, this just causes | |
2496 | * the kiocb to be handled from an async context. | |
2497 | */ | |
2498 | if (kiocb->ki_flags & IOCB_HIPRI) | |
2499 | return -EOPNOTSUPP; | |
2500 | if (kiocb->ki_flags & IOCB_NOWAIT) | |
2501 | return -EAGAIN; | |
2502 | ||
2503 | while (iov_iter_count(iter)) { | |
311ae9e1 | 2504 | struct iovec iovec; |
32960613 JA |
2505 | ssize_t nr; |
2506 | ||
311ae9e1 PB |
2507 | if (!iov_iter_is_bvec(iter)) { |
2508 | iovec = iov_iter_iovec(iter); | |
2509 | } else { | |
2510 | /* fixed buffers import bvec */ | |
2511 | iovec.iov_base = kmap(iter->bvec->bv_page) | |
2512 | + iter->iov_offset; | |
2513 | iovec.iov_len = min(iter->count, | |
2514 | iter->bvec->bv_len - iter->iov_offset); | |
2515 | } | |
2516 | ||
32960613 JA |
2517 | if (rw == READ) { |
2518 | nr = file->f_op->read(file, iovec.iov_base, | |
2519 | iovec.iov_len, &kiocb->ki_pos); | |
2520 | } else { | |
2521 | nr = file->f_op->write(file, iovec.iov_base, | |
2522 | iovec.iov_len, &kiocb->ki_pos); | |
2523 | } | |
2524 | ||
311ae9e1 PB |
2525 | if (iov_iter_is_bvec(iter)) |
2526 | kunmap(iter->bvec->bv_page); | |
2527 | ||
32960613 JA |
2528 | if (nr < 0) { |
2529 | if (!ret) | |
2530 | ret = nr; | |
2531 | break; | |
2532 | } | |
2533 | ret += nr; | |
2534 | if (nr != iovec.iov_len) | |
2535 | break; | |
2536 | iov_iter_advance(iter, nr); | |
2537 | } | |
2538 | ||
2539 | return ret; | |
2540 | } | |
2541 | ||
b7bb4f7d | 2542 | static void io_req_map_rw(struct io_kiocb *req, ssize_t io_size, |
f67676d1 JA |
2543 | struct iovec *iovec, struct iovec *fast_iov, |
2544 | struct iov_iter *iter) | |
2545 | { | |
2546 | req->io->rw.nr_segs = iter->nr_segs; | |
2547 | req->io->rw.size = io_size; | |
2548 | req->io->rw.iov = iovec; | |
2549 | if (!req->io->rw.iov) { | |
2550 | req->io->rw.iov = req->io->rw.fast_iov; | |
45097dae XW |
2551 | if (req->io->rw.iov != fast_iov) |
2552 | memcpy(req->io->rw.iov, fast_iov, | |
2553 | sizeof(struct iovec) * iter->nr_segs); | |
99bc4c38 PB |
2554 | } else { |
2555 | req->flags |= REQ_F_NEED_CLEANUP; | |
f67676d1 JA |
2556 | } |
2557 | } | |
2558 | ||
3d9932a8 XW |
2559 | static inline int __io_alloc_async_ctx(struct io_kiocb *req) |
2560 | { | |
2561 | req->io = kmalloc(sizeof(*req->io), GFP_KERNEL); | |
2562 | return req->io == NULL; | |
2563 | } | |
2564 | ||
b7bb4f7d | 2565 | static int io_alloc_async_ctx(struct io_kiocb *req) |
f67676d1 | 2566 | { |
d3656344 JA |
2567 | if (!io_op_defs[req->opcode].async_ctx) |
2568 | return 0; | |
3d9932a8 XW |
2569 | |
2570 | return __io_alloc_async_ctx(req); | |
b7bb4f7d JA |
2571 | } |
2572 | ||
b7bb4f7d JA |
2573 | static int io_setup_async_rw(struct io_kiocb *req, ssize_t io_size, |
2574 | struct iovec *iovec, struct iovec *fast_iov, | |
2575 | struct iov_iter *iter) | |
2576 | { | |
980ad263 | 2577 | if (!io_op_defs[req->opcode].async_ctx) |
74566df3 | 2578 | return 0; |
5d204bcf | 2579 | if (!req->io) { |
3d9932a8 | 2580 | if (__io_alloc_async_ctx(req)) |
5d204bcf | 2581 | return -ENOMEM; |
b7bb4f7d | 2582 | |
5d204bcf JA |
2583 | io_req_map_rw(req, io_size, iovec, fast_iov, iter); |
2584 | } | |
b7bb4f7d | 2585 | return 0; |
f67676d1 JA |
2586 | } |
2587 | ||
3529d8c2 JA |
2588 | static int io_read_prep(struct io_kiocb *req, const struct io_uring_sqe *sqe, |
2589 | bool force_nonblock) | |
f67676d1 | 2590 | { |
3529d8c2 JA |
2591 | struct io_async_ctx *io; |
2592 | struct iov_iter iter; | |
f67676d1 JA |
2593 | ssize_t ret; |
2594 | ||
3529d8c2 JA |
2595 | ret = io_prep_rw(req, sqe, force_nonblock); |
2596 | if (ret) | |
2597 | return ret; | |
f67676d1 | 2598 | |
3529d8c2 JA |
2599 | if (unlikely(!(req->file->f_mode & FMODE_READ))) |
2600 | return -EBADF; | |
f67676d1 | 2601 | |
5f798bea PB |
2602 | /* either don't need iovec imported or already have it */ |
2603 | if (!req->io || req->flags & REQ_F_NEED_CLEANUP) | |
3529d8c2 JA |
2604 | return 0; |
2605 | ||
2606 | io = req->io; | |
2607 | io->rw.iov = io->rw.fast_iov; | |
2608 | req->io = NULL; | |
bcda7baa | 2609 | ret = io_import_iovec(READ, req, &io->rw.iov, &iter, !force_nonblock); |
3529d8c2 JA |
2610 | req->io = io; |
2611 | if (ret < 0) | |
2612 | return ret; | |
2613 | ||
2614 | io_req_map_rw(req, ret, io->rw.iov, io->rw.fast_iov, &iter); | |
2615 | return 0; | |
f67676d1 JA |
2616 | } |
2617 | ||
014db007 | 2618 | static int io_read(struct io_kiocb *req, bool force_nonblock) |
2b188cc1 JA |
2619 | { |
2620 | struct iovec inline_vecs[UIO_FASTIOV], *iovec = inline_vecs; | |
9adbd45d | 2621 | struct kiocb *kiocb = &req->rw.kiocb; |
2b188cc1 | 2622 | struct iov_iter iter; |
31b51510 | 2623 | size_t iov_count; |
f67676d1 | 2624 | ssize_t io_size, ret; |
2b188cc1 | 2625 | |
bcda7baa | 2626 | ret = io_import_iovec(READ, req, &iovec, &iter, !force_nonblock); |
06b76d44 JA |
2627 | if (ret < 0) |
2628 | return ret; | |
2b188cc1 | 2629 | |
fd6c2e4c JA |
2630 | /* Ensure we clear previously set non-block flag */ |
2631 | if (!force_nonblock) | |
29de5f6a | 2632 | kiocb->ki_flags &= ~IOCB_NOWAIT; |
fd6c2e4c | 2633 | |
797f3f53 | 2634 | req->result = 0; |
f67676d1 | 2635 | io_size = ret; |
dea3b49c | 2636 | if (req->flags & REQ_F_LINK_HEAD) |
f67676d1 JA |
2637 | req->result = io_size; |
2638 | ||
2639 | /* | |
2640 | * If the file doesn't support async, mark it as REQ_F_MUST_PUNT so | |
2641 | * we know to async punt it even if it was opened O_NONBLOCK | |
2642 | */ | |
af197f50 | 2643 | if (force_nonblock && !io_file_supports_async(req->file, READ)) |
f67676d1 | 2644 | goto copy_iov; |
9e645e11 | 2645 | |
31b51510 | 2646 | iov_count = iov_iter_count(&iter); |
9adbd45d | 2647 | ret = rw_verify_area(READ, req->file, &kiocb->ki_pos, iov_count); |
2b188cc1 JA |
2648 | if (!ret) { |
2649 | ssize_t ret2; | |
2650 | ||
9adbd45d JA |
2651 | if (req->file->f_op->read_iter) |
2652 | ret2 = call_read_iter(req->file, kiocb, &iter); | |
32960613 | 2653 | else |
9adbd45d | 2654 | ret2 = loop_rw_iter(READ, req->file, kiocb, &iter); |
32960613 | 2655 | |
9d93a3f5 | 2656 | /* Catch -EAGAIN return for forced non-blocking submission */ |
f67676d1 | 2657 | if (!force_nonblock || ret2 != -EAGAIN) { |
014db007 | 2658 | kiocb_done(kiocb, ret2); |
f67676d1 JA |
2659 | } else { |
2660 | copy_iov: | |
b7bb4f7d | 2661 | ret = io_setup_async_rw(req, io_size, iovec, |
f67676d1 JA |
2662 | inline_vecs, &iter); |
2663 | if (ret) | |
2664 | goto out_free; | |
29de5f6a | 2665 | /* any defer here is final, must blocking retry */ |
490e8967 JA |
2666 | if (!(req->flags & REQ_F_NOWAIT) && |
2667 | !file_can_poll(req->file)) | |
29de5f6a | 2668 | req->flags |= REQ_F_MUST_PUNT; |
f67676d1 JA |
2669 | return -EAGAIN; |
2670 | } | |
2b188cc1 | 2671 | } |
f67676d1 | 2672 | out_free: |
1e95081c | 2673 | kfree(iovec); |
99bc4c38 | 2674 | req->flags &= ~REQ_F_NEED_CLEANUP; |
2b188cc1 JA |
2675 | return ret; |
2676 | } | |
2677 | ||
3529d8c2 JA |
2678 | static int io_write_prep(struct io_kiocb *req, const struct io_uring_sqe *sqe, |
2679 | bool force_nonblock) | |
f67676d1 | 2680 | { |
3529d8c2 JA |
2681 | struct io_async_ctx *io; |
2682 | struct iov_iter iter; | |
f67676d1 JA |
2683 | ssize_t ret; |
2684 | ||
3529d8c2 JA |
2685 | ret = io_prep_rw(req, sqe, force_nonblock); |
2686 | if (ret) | |
2687 | return ret; | |
f67676d1 | 2688 | |
3529d8c2 JA |
2689 | if (unlikely(!(req->file->f_mode & FMODE_WRITE))) |
2690 | return -EBADF; | |
f67676d1 | 2691 | |
4ed734b0 JA |
2692 | req->fsize = rlimit(RLIMIT_FSIZE); |
2693 | ||
5f798bea PB |
2694 | /* either don't need iovec imported or already have it */ |
2695 | if (!req->io || req->flags & REQ_F_NEED_CLEANUP) | |
3529d8c2 JA |
2696 | return 0; |
2697 | ||
2698 | io = req->io; | |
2699 | io->rw.iov = io->rw.fast_iov; | |
2700 | req->io = NULL; | |
bcda7baa | 2701 | ret = io_import_iovec(WRITE, req, &io->rw.iov, &iter, !force_nonblock); |
3529d8c2 JA |
2702 | req->io = io; |
2703 | if (ret < 0) | |
2704 | return ret; | |
2705 | ||
2706 | io_req_map_rw(req, ret, io->rw.iov, io->rw.fast_iov, &iter); | |
2707 | return 0; | |
f67676d1 JA |
2708 | } |
2709 | ||
014db007 | 2710 | static int io_write(struct io_kiocb *req, bool force_nonblock) |
2b188cc1 JA |
2711 | { |
2712 | struct iovec inline_vecs[UIO_FASTIOV], *iovec = inline_vecs; | |
9adbd45d | 2713 | struct kiocb *kiocb = &req->rw.kiocb; |
2b188cc1 | 2714 | struct iov_iter iter; |
31b51510 | 2715 | size_t iov_count; |
f67676d1 | 2716 | ssize_t ret, io_size; |
2b188cc1 | 2717 | |
bcda7baa | 2718 | ret = io_import_iovec(WRITE, req, &iovec, &iter, !force_nonblock); |
06b76d44 JA |
2719 | if (ret < 0) |
2720 | return ret; | |
2b188cc1 | 2721 | |
fd6c2e4c JA |
2722 | /* Ensure we clear previously set non-block flag */ |
2723 | if (!force_nonblock) | |
9adbd45d | 2724 | req->rw.kiocb.ki_flags &= ~IOCB_NOWAIT; |
fd6c2e4c | 2725 | |
797f3f53 | 2726 | req->result = 0; |
f67676d1 | 2727 | io_size = ret; |
dea3b49c | 2728 | if (req->flags & REQ_F_LINK_HEAD) |
f67676d1 | 2729 | req->result = io_size; |
9e645e11 | 2730 | |
f67676d1 JA |
2731 | /* |
2732 | * If the file doesn't support async, mark it as REQ_F_MUST_PUNT so | |
2733 | * we know to async punt it even if it was opened O_NONBLOCK | |
2734 | */ | |
af197f50 | 2735 | if (force_nonblock && !io_file_supports_async(req->file, WRITE)) |
f67676d1 | 2736 | goto copy_iov; |
31b51510 | 2737 | |
10d59345 JA |
2738 | /* file path doesn't support NOWAIT for non-direct_IO */ |
2739 | if (force_nonblock && !(kiocb->ki_flags & IOCB_DIRECT) && | |
2740 | (req->flags & REQ_F_ISREG)) | |
f67676d1 | 2741 | goto copy_iov; |
31b51510 | 2742 | |
f67676d1 | 2743 | iov_count = iov_iter_count(&iter); |
9adbd45d | 2744 | ret = rw_verify_area(WRITE, req->file, &kiocb->ki_pos, iov_count); |
2b188cc1 | 2745 | if (!ret) { |
9bf7933f RP |
2746 | ssize_t ret2; |
2747 | ||
2b188cc1 JA |
2748 | /* |
2749 | * Open-code file_start_write here to grab freeze protection, | |
2750 | * which will be released by another thread in | |
2751 | * io_complete_rw(). Fool lockdep by telling it the lock got | |
2752 | * released so that it doesn't complain about the held lock when | |
2753 | * we return to userspace. | |
2754 | */ | |
491381ce | 2755 | if (req->flags & REQ_F_ISREG) { |
9adbd45d | 2756 | __sb_start_write(file_inode(req->file)->i_sb, |
2b188cc1 | 2757 | SB_FREEZE_WRITE, true); |
9adbd45d | 2758 | __sb_writers_release(file_inode(req->file)->i_sb, |
2b188cc1 JA |
2759 | SB_FREEZE_WRITE); |
2760 | } | |
2761 | kiocb->ki_flags |= IOCB_WRITE; | |
9bf7933f | 2762 | |
4ed734b0 JA |
2763 | if (!force_nonblock) |
2764 | current->signal->rlim[RLIMIT_FSIZE].rlim_cur = req->fsize; | |
2765 | ||
9adbd45d JA |
2766 | if (req->file->f_op->write_iter) |
2767 | ret2 = call_write_iter(req->file, kiocb, &iter); | |
32960613 | 2768 | else |
9adbd45d | 2769 | ret2 = loop_rw_iter(WRITE, req->file, kiocb, &iter); |
4ed734b0 JA |
2770 | |
2771 | if (!force_nonblock) | |
2772 | current->signal->rlim[RLIMIT_FSIZE].rlim_cur = RLIM_INFINITY; | |
2773 | ||
faac996c | 2774 | /* |
bff6035d | 2775 | * Raw bdev writes will return -EOPNOTSUPP for IOCB_NOWAIT. Just |
faac996c JA |
2776 | * retry them without IOCB_NOWAIT. |
2777 | */ | |
2778 | if (ret2 == -EOPNOTSUPP && (kiocb->ki_flags & IOCB_NOWAIT)) | |
2779 | ret2 = -EAGAIN; | |
f67676d1 | 2780 | if (!force_nonblock || ret2 != -EAGAIN) { |
014db007 | 2781 | kiocb_done(kiocb, ret2); |
f67676d1 JA |
2782 | } else { |
2783 | copy_iov: | |
b7bb4f7d | 2784 | ret = io_setup_async_rw(req, io_size, iovec, |
f67676d1 JA |
2785 | inline_vecs, &iter); |
2786 | if (ret) | |
2787 | goto out_free; | |
29de5f6a | 2788 | /* any defer here is final, must blocking retry */ |
c5b85625 JA |
2789 | if (!(req->flags & REQ_F_NOWAIT) && |
2790 | !file_can_poll(req->file)) | |
490e8967 | 2791 | req->flags |= REQ_F_MUST_PUNT; |
f67676d1 JA |
2792 | return -EAGAIN; |
2793 | } | |
2b188cc1 | 2794 | } |
31b51510 | 2795 | out_free: |
99bc4c38 | 2796 | req->flags &= ~REQ_F_NEED_CLEANUP; |
1e95081c | 2797 | kfree(iovec); |
2b188cc1 JA |
2798 | return ret; |
2799 | } | |
2800 | ||
f2a8d5c7 PB |
2801 | static int __io_splice_prep(struct io_kiocb *req, |
2802 | const struct io_uring_sqe *sqe) | |
7d67af2c PB |
2803 | { |
2804 | struct io_splice* sp = &req->splice; | |
2805 | unsigned int valid_flags = SPLICE_F_FD_IN_FIXED | SPLICE_F_ALL; | |
2806 | int ret; | |
2807 | ||
2808 | if (req->flags & REQ_F_NEED_CLEANUP) | |
2809 | return 0; | |
3232dd02 PB |
2810 | if (unlikely(req->ctx->flags & IORING_SETUP_IOPOLL)) |
2811 | return -EINVAL; | |
7d67af2c PB |
2812 | |
2813 | sp->file_in = NULL; | |
7d67af2c PB |
2814 | sp->len = READ_ONCE(sqe->len); |
2815 | sp->flags = READ_ONCE(sqe->splice_flags); | |
2816 | ||
2817 | if (unlikely(sp->flags & ~valid_flags)) | |
2818 | return -EINVAL; | |
2819 | ||
2820 | ret = io_file_get(NULL, req, READ_ONCE(sqe->splice_fd_in), &sp->file_in, | |
2821 | (sp->flags & SPLICE_F_FD_IN_FIXED)); | |
2822 | if (ret) | |
2823 | return ret; | |
2824 | req->flags |= REQ_F_NEED_CLEANUP; | |
2825 | ||
7cdaf587 XW |
2826 | if (!S_ISREG(file_inode(sp->file_in)->i_mode)) { |
2827 | /* | |
2828 | * Splice operation will be punted aync, and here need to | |
2829 | * modify io_wq_work.flags, so initialize io_wq_work firstly. | |
2830 | */ | |
2831 | io_req_init_async(req); | |
7d67af2c | 2832 | req->work.flags |= IO_WQ_WORK_UNBOUND; |
7cdaf587 | 2833 | } |
7d67af2c PB |
2834 | |
2835 | return 0; | |
2836 | } | |
2837 | ||
f2a8d5c7 PB |
2838 | static int io_tee_prep(struct io_kiocb *req, |
2839 | const struct io_uring_sqe *sqe) | |
2840 | { | |
2841 | if (READ_ONCE(sqe->splice_off_in) || READ_ONCE(sqe->off)) | |
2842 | return -EINVAL; | |
2843 | return __io_splice_prep(req, sqe); | |
2844 | } | |
2845 | ||
2846 | static int io_tee(struct io_kiocb *req, bool force_nonblock) | |
2847 | { | |
2848 | struct io_splice *sp = &req->splice; | |
2849 | struct file *in = sp->file_in; | |
2850 | struct file *out = sp->file_out; | |
2851 | unsigned int flags = sp->flags & ~SPLICE_F_FD_IN_FIXED; | |
2852 | long ret = 0; | |
2853 | ||
2854 | if (force_nonblock) | |
2855 | return -EAGAIN; | |
2856 | if (sp->len) | |
2857 | ret = do_tee(in, out, sp->len, flags); | |
2858 | ||
2859 | io_put_file(req, in, (sp->flags & SPLICE_F_FD_IN_FIXED)); | |
2860 | req->flags &= ~REQ_F_NEED_CLEANUP; | |
2861 | ||
2862 | io_cqring_add_event(req, ret); | |
2863 | if (ret != sp->len) | |
2864 | req_set_fail_links(req); | |
2865 | io_put_req(req); | |
2866 | return 0; | |
2867 | } | |
2868 | ||
2869 | static int io_splice_prep(struct io_kiocb *req, const struct io_uring_sqe *sqe) | |
2870 | { | |
2871 | struct io_splice* sp = &req->splice; | |
2872 | ||
2873 | sp->off_in = READ_ONCE(sqe->splice_off_in); | |
2874 | sp->off_out = READ_ONCE(sqe->off); | |
2875 | return __io_splice_prep(req, sqe); | |
2876 | } | |
2877 | ||
014db007 | 2878 | static int io_splice(struct io_kiocb *req, bool force_nonblock) |
7d67af2c PB |
2879 | { |
2880 | struct io_splice *sp = &req->splice; | |
2881 | struct file *in = sp->file_in; | |
2882 | struct file *out = sp->file_out; | |
2883 | unsigned int flags = sp->flags & ~SPLICE_F_FD_IN_FIXED; | |
2884 | loff_t *poff_in, *poff_out; | |
c9687426 | 2885 | long ret = 0; |
7d67af2c | 2886 | |
2fb3e822 PB |
2887 | if (force_nonblock) |
2888 | return -EAGAIN; | |
7d67af2c PB |
2889 | |
2890 | poff_in = (sp->off_in == -1) ? NULL : &sp->off_in; | |
2891 | poff_out = (sp->off_out == -1) ? NULL : &sp->off_out; | |
c9687426 | 2892 | |
948a7749 | 2893 | if (sp->len) |
c9687426 | 2894 | ret = do_splice(in, poff_in, out, poff_out, sp->len, flags); |
7d67af2c PB |
2895 | |
2896 | io_put_file(req, in, (sp->flags & SPLICE_F_FD_IN_FIXED)); | |
2897 | req->flags &= ~REQ_F_NEED_CLEANUP; | |
2898 | ||
2899 | io_cqring_add_event(req, ret); | |
2900 | if (ret != sp->len) | |
2901 | req_set_fail_links(req); | |
014db007 | 2902 | io_put_req(req); |
7d67af2c PB |
2903 | return 0; |
2904 | } | |
2905 | ||
2b188cc1 JA |
2906 | /* |
2907 | * IORING_OP_NOP just posts a completion event, nothing else. | |
2908 | */ | |
78e19bbe | 2909 | static int io_nop(struct io_kiocb *req) |
2b188cc1 JA |
2910 | { |
2911 | struct io_ring_ctx *ctx = req->ctx; | |
2b188cc1 | 2912 | |
def596e9 JA |
2913 | if (unlikely(ctx->flags & IORING_SETUP_IOPOLL)) |
2914 | return -EINVAL; | |
2915 | ||
78e19bbe | 2916 | io_cqring_add_event(req, 0); |
e65ef56d | 2917 | io_put_req(req); |
2b188cc1 JA |
2918 | return 0; |
2919 | } | |
2920 | ||
3529d8c2 | 2921 | static int io_prep_fsync(struct io_kiocb *req, const struct io_uring_sqe *sqe) |
c992fe29 | 2922 | { |
6b06314c | 2923 | struct io_ring_ctx *ctx = req->ctx; |
c992fe29 | 2924 | |
09bb8394 JA |
2925 | if (!req->file) |
2926 | return -EBADF; | |
c992fe29 | 2927 | |
6b06314c | 2928 | if (unlikely(ctx->flags & IORING_SETUP_IOPOLL)) |
def596e9 | 2929 | return -EINVAL; |
edafccee | 2930 | if (unlikely(sqe->addr || sqe->ioprio || sqe->buf_index)) |
c992fe29 CH |
2931 | return -EINVAL; |
2932 | ||
8ed8d3c3 JA |
2933 | req->sync.flags = READ_ONCE(sqe->fsync_flags); |
2934 | if (unlikely(req->sync.flags & ~IORING_FSYNC_DATASYNC)) | |
2935 | return -EINVAL; | |
2936 | ||
2937 | req->sync.off = READ_ONCE(sqe->off); | |
2938 | req->sync.len = READ_ONCE(sqe->len); | |
c992fe29 CH |
2939 | return 0; |
2940 | } | |
2941 | ||
ac45abc0 | 2942 | static int io_fsync(struct io_kiocb *req, bool force_nonblock) |
8ed8d3c3 | 2943 | { |
8ed8d3c3 | 2944 | loff_t end = req->sync.off + req->sync.len; |
8ed8d3c3 JA |
2945 | int ret; |
2946 | ||
ac45abc0 PB |
2947 | /* fsync always requires a blocking context */ |
2948 | if (force_nonblock) | |
2949 | return -EAGAIN; | |
2950 | ||
9adbd45d | 2951 | ret = vfs_fsync_range(req->file, req->sync.off, |
8ed8d3c3 JA |
2952 | end > 0 ? end : LLONG_MAX, |
2953 | req->sync.flags & IORING_FSYNC_DATASYNC); | |
2954 | if (ret < 0) | |
2955 | req_set_fail_links(req); | |
2956 | io_cqring_add_event(req, ret); | |
014db007 | 2957 | io_put_req(req); |
c992fe29 CH |
2958 | return 0; |
2959 | } | |
2960 | ||
d63d1b5e JA |
2961 | static int io_fallocate_prep(struct io_kiocb *req, |
2962 | const struct io_uring_sqe *sqe) | |
2963 | { | |
2964 | if (sqe->ioprio || sqe->buf_index || sqe->rw_flags) | |
2965 | return -EINVAL; | |
3232dd02 PB |
2966 | if (unlikely(req->ctx->flags & IORING_SETUP_IOPOLL)) |
2967 | return -EINVAL; | |
d63d1b5e JA |
2968 | |
2969 | req->sync.off = READ_ONCE(sqe->off); | |
2970 | req->sync.len = READ_ONCE(sqe->addr); | |
2971 | req->sync.mode = READ_ONCE(sqe->len); | |
4ed734b0 | 2972 | req->fsize = rlimit(RLIMIT_FSIZE); |
d63d1b5e JA |
2973 | return 0; |
2974 | } | |
2975 | ||
014db007 | 2976 | static int io_fallocate(struct io_kiocb *req, bool force_nonblock) |
5d17b4a4 | 2977 | { |
ac45abc0 PB |
2978 | int ret; |
2979 | ||
d63d1b5e | 2980 | /* fallocate always requiring blocking context */ |
ac45abc0 | 2981 | if (force_nonblock) |
5d17b4a4 JA |
2982 | return -EAGAIN; |
2983 | ||
ac45abc0 PB |
2984 | current->signal->rlim[RLIMIT_FSIZE].rlim_cur = req->fsize; |
2985 | ret = vfs_fallocate(req->file, req->sync.mode, req->sync.off, | |
2986 | req->sync.len); | |
2987 | current->signal->rlim[RLIMIT_FSIZE].rlim_cur = RLIM_INFINITY; | |
2988 | if (ret < 0) | |
2989 | req_set_fail_links(req); | |
2990 | io_cqring_add_event(req, ret); | |
2991 | io_put_req(req); | |
5d17b4a4 JA |
2992 | return 0; |
2993 | } | |
2994 | ||
ec65fea5 | 2995 | static int __io_openat_prep(struct io_kiocb *req, const struct io_uring_sqe *sqe) |
b7bb4f7d | 2996 | { |
f8748881 | 2997 | const char __user *fname; |
15b71abe | 2998 | int ret; |
b7bb4f7d | 2999 | |
3232dd02 | 3000 | if (unlikely(req->ctx->flags & (IORING_SETUP_IOPOLL|IORING_SETUP_SQPOLL))) |
15b71abe | 3001 | return -EINVAL; |
ec65fea5 | 3002 | if (unlikely(sqe->ioprio || sqe->buf_index)) |
15b71abe | 3003 | return -EINVAL; |
ec65fea5 | 3004 | if (unlikely(req->flags & REQ_F_FIXED_FILE)) |
cf3040ca | 3005 | return -EBADF; |
03b1230c | 3006 | |
ec65fea5 PB |
3007 | /* open.how should be already initialised */ |
3008 | if (!(req->open.how.flags & O_PATH) && force_o_largefile()) | |
08a1d26e | 3009 | req->open.how.flags |= O_LARGEFILE; |
3529d8c2 | 3010 | |
25e72d10 PB |
3011 | req->open.dfd = READ_ONCE(sqe->fd); |
3012 | fname = u64_to_user_ptr(READ_ONCE(sqe->addr)); | |
f8748881 | 3013 | req->open.filename = getname(fname); |
15b71abe JA |
3014 | if (IS_ERR(req->open.filename)) { |
3015 | ret = PTR_ERR(req->open.filename); | |
3016 | req->open.filename = NULL; | |
3017 | return ret; | |
3018 | } | |
4022e7af | 3019 | req->open.nofile = rlimit(RLIMIT_NOFILE); |
8fef80bf | 3020 | req->flags |= REQ_F_NEED_CLEANUP; |
15b71abe | 3021 | return 0; |
03b1230c JA |
3022 | } |
3023 | ||
ec65fea5 PB |
3024 | static int io_openat_prep(struct io_kiocb *req, const struct io_uring_sqe *sqe) |
3025 | { | |
3026 | u64 flags, mode; | |
3027 | ||
3028 | if (req->flags & REQ_F_NEED_CLEANUP) | |
3029 | return 0; | |
3030 | mode = READ_ONCE(sqe->len); | |
3031 | flags = READ_ONCE(sqe->open_flags); | |
3032 | req->open.how = build_open_how(flags, mode); | |
3033 | return __io_openat_prep(req, sqe); | |
3034 | } | |
3035 | ||
cebdb986 | 3036 | static int io_openat2_prep(struct io_kiocb *req, const struct io_uring_sqe *sqe) |
aa1fa28f | 3037 | { |
cebdb986 | 3038 | struct open_how __user *how; |
cebdb986 | 3039 | size_t len; |
0fa03c62 JA |
3040 | int ret; |
3041 | ||
0bdbdd08 PB |
3042 | if (req->flags & REQ_F_NEED_CLEANUP) |
3043 | return 0; | |
cebdb986 JA |
3044 | how = u64_to_user_ptr(READ_ONCE(sqe->addr2)); |
3045 | len = READ_ONCE(sqe->len); | |
cebdb986 JA |
3046 | if (len < OPEN_HOW_SIZE_VER0) |
3047 | return -EINVAL; | |
3529d8c2 | 3048 | |
cebdb986 JA |
3049 | ret = copy_struct_from_user(&req->open.how, sizeof(req->open.how), how, |
3050 | len); | |
3051 | if (ret) | |
3052 | return ret; | |
3529d8c2 | 3053 | |
ec65fea5 | 3054 | return __io_openat_prep(req, sqe); |
cebdb986 JA |
3055 | } |
3056 | ||
014db007 | 3057 | static int io_openat2(struct io_kiocb *req, bool force_nonblock) |
15b71abe JA |
3058 | { |
3059 | struct open_flags op; | |
15b71abe JA |
3060 | struct file *file; |
3061 | int ret; | |
3062 | ||
f86cd20c | 3063 | if (force_nonblock) |
15b71abe | 3064 | return -EAGAIN; |
15b71abe | 3065 | |
cebdb986 | 3066 | ret = build_open_flags(&req->open.how, &op); |
15b71abe JA |
3067 | if (ret) |
3068 | goto err; | |
3069 | ||
4022e7af | 3070 | ret = __get_unused_fd_flags(req->open.how.flags, req->open.nofile); |
15b71abe JA |
3071 | if (ret < 0) |
3072 | goto err; | |
3073 | ||
3074 | file = do_filp_open(req->open.dfd, req->open.filename, &op); | |
3075 | if (IS_ERR(file)) { | |
3076 | put_unused_fd(ret); | |
3077 | ret = PTR_ERR(file); | |
3078 | } else { | |
3079 | fsnotify_open(file); | |
3080 | fd_install(ret, file); | |
3081 | } | |
3082 | err: | |
3083 | putname(req->open.filename); | |
8fef80bf | 3084 | req->flags &= ~REQ_F_NEED_CLEANUP; |
15b71abe JA |
3085 | if (ret < 0) |
3086 | req_set_fail_links(req); | |
3087 | io_cqring_add_event(req, ret); | |
014db007 | 3088 | io_put_req(req); |
15b71abe JA |
3089 | return 0; |
3090 | } | |
3091 | ||
014db007 | 3092 | static int io_openat(struct io_kiocb *req, bool force_nonblock) |
cebdb986 | 3093 | { |
014db007 | 3094 | return io_openat2(req, force_nonblock); |
cebdb986 JA |
3095 | } |
3096 | ||
067524e9 JA |
3097 | static int io_remove_buffers_prep(struct io_kiocb *req, |
3098 | const struct io_uring_sqe *sqe) | |
3099 | { | |
3100 | struct io_provide_buf *p = &req->pbuf; | |
3101 | u64 tmp; | |
3102 | ||
3103 | if (sqe->ioprio || sqe->rw_flags || sqe->addr || sqe->len || sqe->off) | |
3104 | return -EINVAL; | |
3105 | ||
3106 | tmp = READ_ONCE(sqe->fd); | |
3107 | if (!tmp || tmp > USHRT_MAX) | |
3108 | return -EINVAL; | |
3109 | ||
3110 | memset(p, 0, sizeof(*p)); | |
3111 | p->nbufs = tmp; | |
3112 | p->bgid = READ_ONCE(sqe->buf_group); | |
3113 | return 0; | |
3114 | } | |
3115 | ||
3116 | static int __io_remove_buffers(struct io_ring_ctx *ctx, struct io_buffer *buf, | |
3117 | int bgid, unsigned nbufs) | |
3118 | { | |
3119 | unsigned i = 0; | |
3120 | ||
3121 | /* shouldn't happen */ | |
3122 | if (!nbufs) | |
3123 | return 0; | |
3124 | ||
3125 | /* the head kbuf is the list itself */ | |
3126 | while (!list_empty(&buf->list)) { | |
3127 | struct io_buffer *nxt; | |
3128 | ||
3129 | nxt = list_first_entry(&buf->list, struct io_buffer, list); | |
3130 | list_del(&nxt->list); | |
3131 | kfree(nxt); | |
3132 | if (++i == nbufs) | |
3133 | return i; | |
3134 | } | |
3135 | i++; | |
3136 | kfree(buf); | |
3137 | idr_remove(&ctx->io_buffer_idr, bgid); | |
3138 | ||
3139 | return i; | |
3140 | } | |
3141 | ||
3142 | static int io_remove_buffers(struct io_kiocb *req, bool force_nonblock) | |
3143 | { | |
3144 | struct io_provide_buf *p = &req->pbuf; | |
3145 | struct io_ring_ctx *ctx = req->ctx; | |
3146 | struct io_buffer *head; | |
3147 | int ret = 0; | |
3148 | ||
3149 | io_ring_submit_lock(ctx, !force_nonblock); | |
3150 | ||
3151 | lockdep_assert_held(&ctx->uring_lock); | |
3152 | ||
3153 | ret = -ENOENT; | |
3154 | head = idr_find(&ctx->io_buffer_idr, p->bgid); | |
3155 | if (head) | |
3156 | ret = __io_remove_buffers(ctx, head, p->bgid, p->nbufs); | |
3157 | ||
3158 | io_ring_submit_lock(ctx, !force_nonblock); | |
3159 | if (ret < 0) | |
3160 | req_set_fail_links(req); | |
3161 | io_cqring_add_event(req, ret); | |
3162 | io_put_req(req); | |
3163 | return 0; | |
3164 | } | |
3165 | ||
ddf0322d JA |
3166 | static int io_provide_buffers_prep(struct io_kiocb *req, |
3167 | const struct io_uring_sqe *sqe) | |
3168 | { | |
3169 | struct io_provide_buf *p = &req->pbuf; | |
3170 | u64 tmp; | |
3171 | ||
3172 | if (sqe->ioprio || sqe->rw_flags) | |
3173 | return -EINVAL; | |
3174 | ||
3175 | tmp = READ_ONCE(sqe->fd); | |
3176 | if (!tmp || tmp > USHRT_MAX) | |
3177 | return -E2BIG; | |
3178 | p->nbufs = tmp; | |
3179 | p->addr = READ_ONCE(sqe->addr); | |
3180 | p->len = READ_ONCE(sqe->len); | |
3181 | ||
efe68c1c | 3182 | if (!access_ok(u64_to_user_ptr(p->addr), (p->len * p->nbufs))) |
ddf0322d JA |
3183 | return -EFAULT; |
3184 | ||
3185 | p->bgid = READ_ONCE(sqe->buf_group); | |
3186 | tmp = READ_ONCE(sqe->off); | |
3187 | if (tmp > USHRT_MAX) | |
3188 | return -E2BIG; | |
3189 | p->bid = tmp; | |
3190 | return 0; | |
3191 | } | |
3192 | ||
3193 | static int io_add_buffers(struct io_provide_buf *pbuf, struct io_buffer **head) | |
3194 | { | |
3195 | struct io_buffer *buf; | |
3196 | u64 addr = pbuf->addr; | |
3197 | int i, bid = pbuf->bid; | |
3198 | ||
3199 | for (i = 0; i < pbuf->nbufs; i++) { | |
3200 | buf = kmalloc(sizeof(*buf), GFP_KERNEL); | |
3201 | if (!buf) | |
3202 | break; | |
3203 | ||
3204 | buf->addr = addr; | |
3205 | buf->len = pbuf->len; | |
3206 | buf->bid = bid; | |
3207 | addr += pbuf->len; | |
3208 | bid++; | |
3209 | if (!*head) { | |
3210 | INIT_LIST_HEAD(&buf->list); | |
3211 | *head = buf; | |
3212 | } else { | |
3213 | list_add_tail(&buf->list, &(*head)->list); | |
3214 | } | |
3215 | } | |
3216 | ||
3217 | return i ? i : -ENOMEM; | |
3218 | } | |
3219 | ||
ddf0322d JA |
3220 | static int io_provide_buffers(struct io_kiocb *req, bool force_nonblock) |
3221 | { | |
3222 | struct io_provide_buf *p = &req->pbuf; | |
3223 | struct io_ring_ctx *ctx = req->ctx; | |
3224 | struct io_buffer *head, *list; | |
3225 | int ret = 0; | |
3226 | ||
3227 | io_ring_submit_lock(ctx, !force_nonblock); | |
3228 | ||
3229 | lockdep_assert_held(&ctx->uring_lock); | |
3230 | ||
3231 | list = head = idr_find(&ctx->io_buffer_idr, p->bgid); | |
3232 | ||
3233 | ret = io_add_buffers(p, &head); | |
3234 | if (ret < 0) | |
3235 | goto out; | |
3236 | ||
3237 | if (!list) { | |
3238 | ret = idr_alloc(&ctx->io_buffer_idr, head, p->bgid, p->bgid + 1, | |
3239 | GFP_KERNEL); | |
3240 | if (ret < 0) { | |
067524e9 | 3241 | __io_remove_buffers(ctx, head, p->bgid, -1U); |
ddf0322d JA |
3242 | goto out; |
3243 | } | |
3244 | } | |
3245 | out: | |
3246 | io_ring_submit_unlock(ctx, !force_nonblock); | |
3247 | if (ret < 0) | |
3248 | req_set_fail_links(req); | |
3249 | io_cqring_add_event(req, ret); | |
3250 | io_put_req(req); | |
3251 | return 0; | |
cebdb986 JA |
3252 | } |
3253 | ||
3e4827b0 JA |
3254 | static int io_epoll_ctl_prep(struct io_kiocb *req, |
3255 | const struct io_uring_sqe *sqe) | |
3256 | { | |
3257 | #if defined(CONFIG_EPOLL) | |
3258 | if (sqe->ioprio || sqe->buf_index) | |
3259 | return -EINVAL; | |
3232dd02 PB |
3260 | if (unlikely(req->ctx->flags & IORING_SETUP_IOPOLL)) |
3261 | return -EINVAL; | |
3e4827b0 JA |
3262 | |
3263 | req->epoll.epfd = READ_ONCE(sqe->fd); | |
3264 | req->epoll.op = READ_ONCE(sqe->len); | |
3265 | req->epoll.fd = READ_ONCE(sqe->off); | |
3266 | ||
3267 | if (ep_op_has_event(req->epoll.op)) { | |
3268 | struct epoll_event __user *ev; | |
3269 | ||
3270 | ev = u64_to_user_ptr(READ_ONCE(sqe->addr)); | |
3271 | if (copy_from_user(&req->epoll.event, ev, sizeof(*ev))) | |
3272 | return -EFAULT; | |
3273 | } | |
3274 | ||
3275 | return 0; | |
3276 | #else | |
3277 | return -EOPNOTSUPP; | |
3278 | #endif | |
3279 | } | |
3280 | ||
014db007 | 3281 | static int io_epoll_ctl(struct io_kiocb *req, bool force_nonblock) |
3e4827b0 JA |
3282 | { |
3283 | #if defined(CONFIG_EPOLL) | |
3284 | struct io_epoll *ie = &req->epoll; | |
3285 | int ret; | |
3286 | ||
3287 | ret = do_epoll_ctl(ie->epfd, ie->op, ie->fd, &ie->event, force_nonblock); | |
3288 | if (force_nonblock && ret == -EAGAIN) | |
3289 | return -EAGAIN; | |
3290 | ||
3291 | if (ret < 0) | |
3292 | req_set_fail_links(req); | |
3293 | io_cqring_add_event(req, ret); | |
014db007 | 3294 | io_put_req(req); |
3e4827b0 JA |
3295 | return 0; |
3296 | #else | |
3297 | return -EOPNOTSUPP; | |
3298 | #endif | |
3299 | } | |
3300 | ||
c1ca757b JA |
3301 | static int io_madvise_prep(struct io_kiocb *req, const struct io_uring_sqe *sqe) |
3302 | { | |
3303 | #if defined(CONFIG_ADVISE_SYSCALLS) && defined(CONFIG_MMU) | |
3304 | if (sqe->ioprio || sqe->buf_index || sqe->off) | |
3305 | return -EINVAL; | |
3232dd02 PB |
3306 | if (unlikely(req->ctx->flags & IORING_SETUP_IOPOLL)) |
3307 | return -EINVAL; | |
c1ca757b JA |
3308 | |
3309 | req->madvise.addr = READ_ONCE(sqe->addr); | |
3310 | req->madvise.len = READ_ONCE(sqe->len); | |
3311 | req->madvise.advice = READ_ONCE(sqe->fadvise_advice); | |
3312 | return 0; | |
3313 | #else | |
3314 | return -EOPNOTSUPP; | |
3315 | #endif | |
3316 | } | |
3317 | ||
014db007 | 3318 | static int io_madvise(struct io_kiocb *req, bool force_nonblock) |
c1ca757b JA |
3319 | { |
3320 | #if defined(CONFIG_ADVISE_SYSCALLS) && defined(CONFIG_MMU) | |
3321 | struct io_madvise *ma = &req->madvise; | |
3322 | int ret; | |
3323 | ||
3324 | if (force_nonblock) | |
3325 | return -EAGAIN; | |
3326 | ||
3327 | ret = do_madvise(ma->addr, ma->len, ma->advice); | |
3328 | if (ret < 0) | |
3329 | req_set_fail_links(req); | |
3330 | io_cqring_add_event(req, ret); | |
014db007 | 3331 | io_put_req(req); |
c1ca757b JA |
3332 | return 0; |
3333 | #else | |
3334 | return -EOPNOTSUPP; | |
3335 | #endif | |
3336 | } | |
3337 | ||
4840e418 JA |
3338 | static int io_fadvise_prep(struct io_kiocb *req, const struct io_uring_sqe *sqe) |
3339 | { | |
3340 | if (sqe->ioprio || sqe->buf_index || sqe->addr) | |
3341 | return -EINVAL; | |
3232dd02 PB |
3342 | if (unlikely(req->ctx->flags & IORING_SETUP_IOPOLL)) |
3343 | return -EINVAL; | |
4840e418 JA |
3344 | |
3345 | req->fadvise.offset = READ_ONCE(sqe->off); | |
3346 | req->fadvise.len = READ_ONCE(sqe->len); | |
3347 | req->fadvise.advice = READ_ONCE(sqe->fadvise_advice); | |
3348 | return 0; | |
3349 | } | |
3350 | ||
014db007 | 3351 | static int io_fadvise(struct io_kiocb *req, bool force_nonblock) |
4840e418 JA |
3352 | { |
3353 | struct io_fadvise *fa = &req->fadvise; | |
3354 | int ret; | |
3355 | ||
3e69426d JA |
3356 | if (force_nonblock) { |
3357 | switch (fa->advice) { | |
3358 | case POSIX_FADV_NORMAL: | |
3359 | case POSIX_FADV_RANDOM: | |
3360 | case POSIX_FADV_SEQUENTIAL: | |
3361 | break; | |
3362 | default: | |
3363 | return -EAGAIN; | |
3364 | } | |
3365 | } | |
4840e418 JA |
3366 | |
3367 | ret = vfs_fadvise(req->file, fa->offset, fa->len, fa->advice); | |
3368 | if (ret < 0) | |
3369 | req_set_fail_links(req); | |
3370 | io_cqring_add_event(req, ret); | |
014db007 | 3371 | io_put_req(req); |
4840e418 JA |
3372 | return 0; |
3373 | } | |
3374 | ||
eddc7ef5 JA |
3375 | static int io_statx_prep(struct io_kiocb *req, const struct io_uring_sqe *sqe) |
3376 | { | |
3232dd02 PB |
3377 | if (unlikely(req->ctx->flags & IORING_SETUP_IOPOLL)) |
3378 | return -EINVAL; | |
eddc7ef5 JA |
3379 | if (sqe->ioprio || sqe->buf_index) |
3380 | return -EINVAL; | |
9c280f90 | 3381 | if (req->flags & REQ_F_FIXED_FILE) |
cf3040ca | 3382 | return -EBADF; |
eddc7ef5 | 3383 | |
1d9e1288 BM |
3384 | req->statx.dfd = READ_ONCE(sqe->fd); |
3385 | req->statx.mask = READ_ONCE(sqe->len); | |
e62753e4 | 3386 | req->statx.filename = u64_to_user_ptr(READ_ONCE(sqe->addr)); |
1d9e1288 BM |
3387 | req->statx.buffer = u64_to_user_ptr(READ_ONCE(sqe->addr2)); |
3388 | req->statx.flags = READ_ONCE(sqe->statx_flags); | |
eddc7ef5 JA |
3389 | |
3390 | return 0; | |
3391 | } | |
3392 | ||
014db007 | 3393 | static int io_statx(struct io_kiocb *req, bool force_nonblock) |
eddc7ef5 | 3394 | { |
1d9e1288 | 3395 | struct io_statx *ctx = &req->statx; |
eddc7ef5 JA |
3396 | int ret; |
3397 | ||
5b0bbee4 JA |
3398 | if (force_nonblock) { |
3399 | /* only need file table for an actual valid fd */ | |
3400 | if (ctx->dfd == -1 || ctx->dfd == AT_FDCWD) | |
3401 | req->flags |= REQ_F_NO_FILE_TABLE; | |
eddc7ef5 | 3402 | return -EAGAIN; |
5b0bbee4 | 3403 | } |
eddc7ef5 | 3404 | |
e62753e4 BM |
3405 | ret = do_statx(ctx->dfd, ctx->filename, ctx->flags, ctx->mask, |
3406 | ctx->buffer); | |
eddc7ef5 | 3407 | |
eddc7ef5 JA |
3408 | if (ret < 0) |
3409 | req_set_fail_links(req); | |
3410 | io_cqring_add_event(req, ret); | |
014db007 | 3411 | io_put_req(req); |
eddc7ef5 JA |
3412 | return 0; |
3413 | } | |
3414 | ||
b5dba59e JA |
3415 | static int io_close_prep(struct io_kiocb *req, const struct io_uring_sqe *sqe) |
3416 | { | |
3417 | /* | |
3418 | * If we queue this for async, it must not be cancellable. That would | |
7cdaf587 XW |
3419 | * leave the 'file' in an undeterminate state, and here need to modify |
3420 | * io_wq_work.flags, so initialize io_wq_work firstly. | |
b5dba59e | 3421 | */ |
7cdaf587 | 3422 | io_req_init_async(req); |
b5dba59e JA |
3423 | req->work.flags |= IO_WQ_WORK_NO_CANCEL; |
3424 | ||
3232dd02 PB |
3425 | if (unlikely(req->ctx->flags & (IORING_SETUP_IOPOLL|IORING_SETUP_SQPOLL))) |
3426 | return -EINVAL; | |
b5dba59e JA |
3427 | if (sqe->ioprio || sqe->off || sqe->addr || sqe->len || |
3428 | sqe->rw_flags || sqe->buf_index) | |
3429 | return -EINVAL; | |
9c280f90 | 3430 | if (req->flags & REQ_F_FIXED_FILE) |
cf3040ca | 3431 | return -EBADF; |
b5dba59e JA |
3432 | |
3433 | req->close.fd = READ_ONCE(sqe->fd); | |
fd2206e4 JA |
3434 | if ((req->file && req->file->f_op == &io_uring_fops) || |
3435 | req->close.fd == req->ctx->ring_fd) | |
3436 | return -EBADF; | |
b5dba59e | 3437 | |
3af73b28 | 3438 | req->close.put_file = NULL; |
b5dba59e | 3439 | return 0; |
b5dba59e JA |
3440 | } |
3441 | ||
014db007 | 3442 | static int io_close(struct io_kiocb *req, bool force_nonblock) |
b5dba59e | 3443 | { |
3af73b28 | 3444 | struct io_close *close = &req->close; |
b5dba59e JA |
3445 | int ret; |
3446 | ||
3af73b28 PB |
3447 | /* might be already done during nonblock submission */ |
3448 | if (!close->put_file) { | |
3449 | ret = __close_fd_get_file(close->fd, &close->put_file); | |
3450 | if (ret < 0) | |
3451 | return (ret == -ENOENT) ? -EBADF : ret; | |
3452 | } | |
b5dba59e JA |
3453 | |
3454 | /* if the file has a flush method, be safe and punt to async */ | |
3af73b28 | 3455 | if (close->put_file->f_op->flush && force_nonblock) { |
0bf0eefd PB |
3456 | /* avoid grabbing files - we don't need the files */ |
3457 | req->flags |= REQ_F_NO_FILE_TABLE | REQ_F_MUST_PUNT; | |
0bf0eefd | 3458 | return -EAGAIN; |
a2100672 | 3459 | } |
b5dba59e | 3460 | |
3af73b28 PB |
3461 | /* No ->flush() or already async, safely close from here */ |
3462 | ret = filp_close(close->put_file, req->work.files); | |
3463 | if (ret < 0) | |
3464 | req_set_fail_links(req); | |
3465 | io_cqring_add_event(req, ret); | |
3466 | fput(close->put_file); | |
3467 | close->put_file = NULL; | |
3468 | io_put_req(req); | |
1a417f4e | 3469 | return 0; |
b5dba59e JA |
3470 | } |
3471 | ||
3529d8c2 | 3472 | static int io_prep_sfr(struct io_kiocb *req, const struct io_uring_sqe *sqe) |
5d17b4a4 JA |
3473 | { |
3474 | struct io_ring_ctx *ctx = req->ctx; | |
5d17b4a4 JA |
3475 | |
3476 | if (!req->file) | |
3477 | return -EBADF; | |
5d17b4a4 JA |
3478 | |
3479 | if (unlikely(ctx->flags & IORING_SETUP_IOPOLL)) | |
3480 | return -EINVAL; | |
3481 | if (unlikely(sqe->addr || sqe->ioprio || sqe->buf_index)) | |
3482 | return -EINVAL; | |
3483 | ||
8ed8d3c3 JA |
3484 | req->sync.off = READ_ONCE(sqe->off); |
3485 | req->sync.len = READ_ONCE(sqe->len); | |
3486 | req->sync.flags = READ_ONCE(sqe->sync_range_flags); | |
8ed8d3c3 JA |
3487 | return 0; |
3488 | } | |
3489 | ||
ac45abc0 | 3490 | static int io_sync_file_range(struct io_kiocb *req, bool force_nonblock) |
8ed8d3c3 | 3491 | { |
8ed8d3c3 JA |
3492 | int ret; |
3493 | ||
ac45abc0 PB |
3494 | /* sync_file_range always requires a blocking context */ |
3495 | if (force_nonblock) | |
3496 | return -EAGAIN; | |
3497 | ||
9adbd45d | 3498 | ret = sync_file_range(req->file, req->sync.off, req->sync.len, |
8ed8d3c3 JA |
3499 | req->sync.flags); |
3500 | if (ret < 0) | |
3501 | req_set_fail_links(req); | |
3502 | io_cqring_add_event(req, ret); | |
014db007 | 3503 | io_put_req(req); |
5d17b4a4 JA |
3504 | return 0; |
3505 | } | |
3506 | ||
469956e8 | 3507 | #if defined(CONFIG_NET) |
02d27d89 PB |
3508 | static int io_setup_async_msg(struct io_kiocb *req, |
3509 | struct io_async_msghdr *kmsg) | |
3510 | { | |
3511 | if (req->io) | |
3512 | return -EAGAIN; | |
3513 | if (io_alloc_async_ctx(req)) { | |
3514 | if (kmsg->iov != kmsg->fast_iov) | |
3515 | kfree(kmsg->iov); | |
3516 | return -ENOMEM; | |
3517 | } | |
3518 | req->flags |= REQ_F_NEED_CLEANUP; | |
3519 | memcpy(&req->io->msg, kmsg, sizeof(*kmsg)); | |
3520 | return -EAGAIN; | |
3521 | } | |
3522 | ||
3529d8c2 | 3523 | static int io_sendmsg_prep(struct io_kiocb *req, const struct io_uring_sqe *sqe) |
03b1230c | 3524 | { |
e47293fd | 3525 | struct io_sr_msg *sr = &req->sr_msg; |
3529d8c2 | 3526 | struct io_async_ctx *io = req->io; |
99bc4c38 | 3527 | int ret; |
03b1230c | 3528 | |
d2b6f48b PB |
3529 | if (unlikely(req->ctx->flags & IORING_SETUP_IOPOLL)) |
3530 | return -EINVAL; | |
3531 | ||
e47293fd JA |
3532 | sr->msg_flags = READ_ONCE(sqe->msg_flags); |
3533 | sr->msg = u64_to_user_ptr(READ_ONCE(sqe->addr)); | |
fddaface | 3534 | sr->len = READ_ONCE(sqe->len); |
3529d8c2 | 3535 | |
d8768362 JA |
3536 | #ifdef CONFIG_COMPAT |
3537 | if (req->ctx->compat) | |
3538 | sr->msg_flags |= MSG_CMSG_COMPAT; | |
3539 | #endif | |
3540 | ||
fddaface | 3541 | if (!io || req->opcode == IORING_OP_SEND) |
3529d8c2 | 3542 | return 0; |
5f798bea PB |
3543 | /* iovec is already imported */ |
3544 | if (req->flags & REQ_F_NEED_CLEANUP) | |
3545 | return 0; | |
3529d8c2 | 3546 | |
d9688565 | 3547 | io->msg.iov = io->msg.fast_iov; |
99bc4c38 | 3548 | ret = sendmsg_copy_msghdr(&io->msg.msg, sr->msg, sr->msg_flags, |
e47293fd | 3549 | &io->msg.iov); |
99bc4c38 PB |
3550 | if (!ret) |
3551 | req->flags |= REQ_F_NEED_CLEANUP; | |
3552 | return ret; | |
03b1230c JA |
3553 | } |
3554 | ||
014db007 | 3555 | static int io_sendmsg(struct io_kiocb *req, bool force_nonblock) |
aa1fa28f | 3556 | { |
0b416c3e | 3557 | struct io_async_msghdr *kmsg = NULL; |
0fa03c62 JA |
3558 | struct socket *sock; |
3559 | int ret; | |
3560 | ||
0fa03c62 JA |
3561 | sock = sock_from_file(req->file, &ret); |
3562 | if (sock) { | |
b7bb4f7d | 3563 | struct io_async_ctx io; |
0fa03c62 JA |
3564 | unsigned flags; |
3565 | ||
03b1230c | 3566 | if (req->io) { |
0b416c3e | 3567 | kmsg = &req->io->msg; |
b537916c | 3568 | kmsg->msg.msg_name = &req->io->msg.addr; |
0b416c3e JA |
3569 | /* if iov is set, it's allocated already */ |
3570 | if (!kmsg->iov) | |
3571 | kmsg->iov = kmsg->fast_iov; | |
3572 | kmsg->msg.msg_iter.iov = kmsg->iov; | |
03b1230c | 3573 | } else { |
3529d8c2 JA |
3574 | struct io_sr_msg *sr = &req->sr_msg; |
3575 | ||
0b416c3e | 3576 | kmsg = &io.msg; |
b537916c | 3577 | kmsg->msg.msg_name = &io.msg.addr; |
3529d8c2 JA |
3578 | |
3579 | io.msg.iov = io.msg.fast_iov; | |
3580 | ret = sendmsg_copy_msghdr(&io.msg.msg, sr->msg, | |
3581 | sr->msg_flags, &io.msg.iov); | |
03b1230c | 3582 | if (ret) |
3529d8c2 | 3583 | return ret; |
03b1230c | 3584 | } |
0fa03c62 | 3585 | |
e47293fd JA |
3586 | flags = req->sr_msg.msg_flags; |
3587 | if (flags & MSG_DONTWAIT) | |
3588 | req->flags |= REQ_F_NOWAIT; | |
3589 | else if (force_nonblock) | |
3590 | flags |= MSG_DONTWAIT; | |
3591 | ||
0b416c3e | 3592 | ret = __sys_sendmsg_sock(sock, &kmsg->msg, flags); |
02d27d89 PB |
3593 | if (force_nonblock && ret == -EAGAIN) |
3594 | return io_setup_async_msg(req, kmsg); | |
441cdbd5 JA |
3595 | if (ret == -ERESTARTSYS) |
3596 | ret = -EINTR; | |
0fa03c62 JA |
3597 | } |
3598 | ||
1e95081c | 3599 | if (kmsg && kmsg->iov != kmsg->fast_iov) |
0b416c3e | 3600 | kfree(kmsg->iov); |
99bc4c38 | 3601 | req->flags &= ~REQ_F_NEED_CLEANUP; |
78e19bbe | 3602 | io_cqring_add_event(req, ret); |
4e88d6e7 JA |
3603 | if (ret < 0) |
3604 | req_set_fail_links(req); | |
014db007 | 3605 | io_put_req(req); |
5d17b4a4 | 3606 | return 0; |
03b1230c | 3607 | } |
aa1fa28f | 3608 | |
014db007 | 3609 | static int io_send(struct io_kiocb *req, bool force_nonblock) |
fddaface | 3610 | { |
fddaface JA |
3611 | struct socket *sock; |
3612 | int ret; | |
3613 | ||
fddaface JA |
3614 | sock = sock_from_file(req->file, &ret); |
3615 | if (sock) { | |
3616 | struct io_sr_msg *sr = &req->sr_msg; | |
3617 | struct msghdr msg; | |
3618 | struct iovec iov; | |
3619 | unsigned flags; | |
3620 | ||
3621 | ret = import_single_range(WRITE, sr->buf, sr->len, &iov, | |
3622 | &msg.msg_iter); | |
3623 | if (ret) | |
3624 | return ret; | |
3625 | ||
3626 | msg.msg_name = NULL; | |
3627 | msg.msg_control = NULL; | |
3628 | msg.msg_controllen = 0; | |
3629 | msg.msg_namelen = 0; | |
3630 | ||
3631 | flags = req->sr_msg.msg_flags; | |
3632 | if (flags & MSG_DONTWAIT) | |
3633 | req->flags |= REQ_F_NOWAIT; | |
3634 | else if (force_nonblock) | |
3635 | flags |= MSG_DONTWAIT; | |
3636 | ||
0b7b21e4 JA |
3637 | msg.msg_flags = flags; |
3638 | ret = sock_sendmsg(sock, &msg); | |
fddaface JA |
3639 | if (force_nonblock && ret == -EAGAIN) |
3640 | return -EAGAIN; | |
3641 | if (ret == -ERESTARTSYS) | |
3642 | ret = -EINTR; | |
3643 | } | |
3644 | ||
3645 | io_cqring_add_event(req, ret); | |
3646 | if (ret < 0) | |
3647 | req_set_fail_links(req); | |
014db007 | 3648 | io_put_req(req); |
fddaface | 3649 | return 0; |
fddaface JA |
3650 | } |
3651 | ||
52de1fe1 JA |
3652 | static int __io_recvmsg_copy_hdr(struct io_kiocb *req, struct io_async_ctx *io) |
3653 | { | |
3654 | struct io_sr_msg *sr = &req->sr_msg; | |
3655 | struct iovec __user *uiov; | |
3656 | size_t iov_len; | |
3657 | int ret; | |
3658 | ||
3659 | ret = __copy_msghdr_from_user(&io->msg.msg, sr->msg, &io->msg.uaddr, | |
3660 | &uiov, &iov_len); | |
3661 | if (ret) | |
3662 | return ret; | |
3663 | ||
3664 | if (req->flags & REQ_F_BUFFER_SELECT) { | |
3665 | if (iov_len > 1) | |
3666 | return -EINVAL; | |
3667 | if (copy_from_user(io->msg.iov, uiov, sizeof(*uiov))) | |
3668 | return -EFAULT; | |
3669 | sr->len = io->msg.iov[0].iov_len; | |
3670 | iov_iter_init(&io->msg.msg.msg_iter, READ, io->msg.iov, 1, | |
3671 | sr->len); | |
3672 | io->msg.iov = NULL; | |
3673 | } else { | |
3674 | ret = import_iovec(READ, uiov, iov_len, UIO_FASTIOV, | |
3675 | &io->msg.iov, &io->msg.msg.msg_iter); | |
3676 | if (ret > 0) | |
3677 | ret = 0; | |
3678 | } | |
3679 | ||
3680 | return ret; | |
3681 | } | |
3682 | ||
3683 | #ifdef CONFIG_COMPAT | |
3684 | static int __io_compat_recvmsg_copy_hdr(struct io_kiocb *req, | |
3685 | struct io_async_ctx *io) | |
3686 | { | |
3687 | struct compat_msghdr __user *msg_compat; | |
3688 | struct io_sr_msg *sr = &req->sr_msg; | |
3689 | struct compat_iovec __user *uiov; | |
3690 | compat_uptr_t ptr; | |
3691 | compat_size_t len; | |
3692 | int ret; | |
3693 | ||
3694 | msg_compat = (struct compat_msghdr __user *) sr->msg; | |
3695 | ret = __get_compat_msghdr(&io->msg.msg, msg_compat, &io->msg.uaddr, | |
3696 | &ptr, &len); | |
3697 | if (ret) | |
3698 | return ret; | |
3699 | ||
3700 | uiov = compat_ptr(ptr); | |
3701 | if (req->flags & REQ_F_BUFFER_SELECT) { | |
3702 | compat_ssize_t clen; | |
3703 | ||
3704 | if (len > 1) | |
3705 | return -EINVAL; | |
3706 | if (!access_ok(uiov, sizeof(*uiov))) | |
3707 | return -EFAULT; | |
3708 | if (__get_user(clen, &uiov->iov_len)) | |
3709 | return -EFAULT; | |
3710 | if (clen < 0) | |
3711 | return -EINVAL; | |
3712 | sr->len = io->msg.iov[0].iov_len; | |
3713 | io->msg.iov = NULL; | |
3714 | } else { | |
3715 | ret = compat_import_iovec(READ, uiov, len, UIO_FASTIOV, | |
3716 | &io->msg.iov, | |
3717 | &io->msg.msg.msg_iter); | |
3718 | if (ret < 0) | |
3719 | return ret; | |
3720 | } | |
3721 | ||
3722 | return 0; | |
3723 | } | |
3724 | #endif | |
3725 | ||
3726 | static int io_recvmsg_copy_hdr(struct io_kiocb *req, struct io_async_ctx *io) | |
3727 | { | |
3728 | io->msg.iov = io->msg.fast_iov; | |
3729 | ||
3730 | #ifdef CONFIG_COMPAT | |
3731 | if (req->ctx->compat) | |
3732 | return __io_compat_recvmsg_copy_hdr(req, io); | |
fddaface | 3733 | #endif |
52de1fe1 JA |
3734 | |
3735 | return __io_recvmsg_copy_hdr(req, io); | |
3736 | } | |
3737 | ||
bcda7baa JA |
3738 | static struct io_buffer *io_recv_buffer_select(struct io_kiocb *req, |
3739 | int *cflags, bool needs_lock) | |
3740 | { | |
3741 | struct io_sr_msg *sr = &req->sr_msg; | |
3742 | struct io_buffer *kbuf; | |
3743 | ||
3744 | if (!(req->flags & REQ_F_BUFFER_SELECT)) | |
3745 | return NULL; | |
3746 | ||
3747 | kbuf = io_buffer_select(req, &sr->len, sr->bgid, sr->kbuf, needs_lock); | |
3748 | if (IS_ERR(kbuf)) | |
3749 | return kbuf; | |
3750 | ||
3751 | sr->kbuf = kbuf; | |
3752 | req->flags |= REQ_F_BUFFER_SELECTED; | |
3753 | ||
3754 | *cflags = kbuf->bid << IORING_CQE_BUFFER_SHIFT; | |
3755 | *cflags |= IORING_CQE_F_BUFFER; | |
3756 | return kbuf; | |
fddaface JA |
3757 | } |
3758 | ||
3529d8c2 JA |
3759 | static int io_recvmsg_prep(struct io_kiocb *req, |
3760 | const struct io_uring_sqe *sqe) | |
aa1fa28f | 3761 | { |
e47293fd | 3762 | struct io_sr_msg *sr = &req->sr_msg; |
3529d8c2 | 3763 | struct io_async_ctx *io = req->io; |
99bc4c38 | 3764 | int ret; |
3529d8c2 | 3765 | |
d2b6f48b PB |
3766 | if (unlikely(req->ctx->flags & IORING_SETUP_IOPOLL)) |
3767 | return -EINVAL; | |
3768 | ||
3529d8c2 JA |
3769 | sr->msg_flags = READ_ONCE(sqe->msg_flags); |
3770 | sr->msg = u64_to_user_ptr(READ_ONCE(sqe->addr)); | |
0b7b21e4 | 3771 | sr->len = READ_ONCE(sqe->len); |
bcda7baa | 3772 | sr->bgid = READ_ONCE(sqe->buf_group); |
06b76d44 | 3773 | |
d8768362 JA |
3774 | #ifdef CONFIG_COMPAT |
3775 | if (req->ctx->compat) | |
3776 | sr->msg_flags |= MSG_CMSG_COMPAT; | |
3777 | #endif | |
3778 | ||
fddaface | 3779 | if (!io || req->opcode == IORING_OP_RECV) |
06b76d44 | 3780 | return 0; |
5f798bea PB |
3781 | /* iovec is already imported */ |
3782 | if (req->flags & REQ_F_NEED_CLEANUP) | |
3783 | return 0; | |
03b1230c | 3784 | |
52de1fe1 | 3785 | ret = io_recvmsg_copy_hdr(req, io); |
99bc4c38 PB |
3786 | if (!ret) |
3787 | req->flags |= REQ_F_NEED_CLEANUP; | |
3788 | return ret; | |
aa1fa28f JA |
3789 | } |
3790 | ||
014db007 | 3791 | static int io_recvmsg(struct io_kiocb *req, bool force_nonblock) |
aa1fa28f | 3792 | { |
0b416c3e | 3793 | struct io_async_msghdr *kmsg = NULL; |
03b1230c | 3794 | struct socket *sock; |
52de1fe1 | 3795 | int ret, cflags = 0; |
03b1230c | 3796 | |
03b1230c JA |
3797 | sock = sock_from_file(req->file, &ret); |
3798 | if (sock) { | |
52de1fe1 | 3799 | struct io_buffer *kbuf; |
b7bb4f7d | 3800 | struct io_async_ctx io; |
03b1230c JA |
3801 | unsigned flags; |
3802 | ||
03b1230c | 3803 | if (req->io) { |
0b416c3e | 3804 | kmsg = &req->io->msg; |
b537916c | 3805 | kmsg->msg.msg_name = &req->io->msg.addr; |
0b416c3e JA |
3806 | /* if iov is set, it's allocated already */ |
3807 | if (!kmsg->iov) | |
3808 | kmsg->iov = kmsg->fast_iov; | |
3809 | kmsg->msg.msg_iter.iov = kmsg->iov; | |
03b1230c | 3810 | } else { |
0b416c3e | 3811 | kmsg = &io.msg; |
b537916c | 3812 | kmsg->msg.msg_name = &io.msg.addr; |
3529d8c2 | 3813 | |
52de1fe1 | 3814 | ret = io_recvmsg_copy_hdr(req, &io); |
03b1230c | 3815 | if (ret) |
3529d8c2 | 3816 | return ret; |
03b1230c JA |
3817 | } |
3818 | ||
52de1fe1 JA |
3819 | kbuf = io_recv_buffer_select(req, &cflags, !force_nonblock); |
3820 | if (IS_ERR(kbuf)) { | |
3821 | return PTR_ERR(kbuf); | |
3822 | } else if (kbuf) { | |
3823 | kmsg->fast_iov[0].iov_base = u64_to_user_ptr(kbuf->addr); | |
3824 | iov_iter_init(&kmsg->msg.msg_iter, READ, kmsg->iov, | |
3825 | 1, req->sr_msg.len); | |
3826 | } | |
3827 | ||
e47293fd JA |
3828 | flags = req->sr_msg.msg_flags; |
3829 | if (flags & MSG_DONTWAIT) | |
3830 | req->flags |= REQ_F_NOWAIT; | |
3831 | else if (force_nonblock) | |
3832 | flags |= MSG_DONTWAIT; | |
3833 | ||
3834 | ret = __sys_recvmsg_sock(sock, &kmsg->msg, req->sr_msg.msg, | |
3835 | kmsg->uaddr, flags); | |
02d27d89 PB |
3836 | if (force_nonblock && ret == -EAGAIN) |
3837 | return io_setup_async_msg(req, kmsg); | |
03b1230c JA |
3838 | if (ret == -ERESTARTSYS) |
3839 | ret = -EINTR; | |
3840 | } | |
3841 | ||
1e95081c | 3842 | if (kmsg && kmsg->iov != kmsg->fast_iov) |
0b416c3e | 3843 | kfree(kmsg->iov); |
99bc4c38 | 3844 | req->flags &= ~REQ_F_NEED_CLEANUP; |
52de1fe1 | 3845 | __io_cqring_add_event(req, ret, cflags); |
4e88d6e7 JA |
3846 | if (ret < 0) |
3847 | req_set_fail_links(req); | |
014db007 | 3848 | io_put_req(req); |
03b1230c | 3849 | return 0; |
0fa03c62 | 3850 | } |
5d17b4a4 | 3851 | |
014db007 | 3852 | static int io_recv(struct io_kiocb *req, bool force_nonblock) |
fddaface | 3853 | { |
bcda7baa | 3854 | struct io_buffer *kbuf = NULL; |
fddaface | 3855 | struct socket *sock; |
bcda7baa | 3856 | int ret, cflags = 0; |
fddaface | 3857 | |
fddaface JA |
3858 | sock = sock_from_file(req->file, &ret); |
3859 | if (sock) { | |
3860 | struct io_sr_msg *sr = &req->sr_msg; | |
bcda7baa | 3861 | void __user *buf = sr->buf; |
fddaface JA |
3862 | struct msghdr msg; |
3863 | struct iovec iov; | |
3864 | unsigned flags; | |
3865 | ||
bcda7baa JA |
3866 | kbuf = io_recv_buffer_select(req, &cflags, !force_nonblock); |
3867 | if (IS_ERR(kbuf)) | |
3868 | return PTR_ERR(kbuf); | |
3869 | else if (kbuf) | |
3870 | buf = u64_to_user_ptr(kbuf->addr); | |
3871 | ||
3872 | ret = import_single_range(READ, buf, sr->len, &iov, | |
fddaface | 3873 | &msg.msg_iter); |
bcda7baa JA |
3874 | if (ret) { |
3875 | kfree(kbuf); | |
fddaface | 3876 | return ret; |
bcda7baa | 3877 | } |
fddaface | 3878 | |
bcda7baa | 3879 | req->flags |= REQ_F_NEED_CLEANUP; |
fddaface JA |
3880 | msg.msg_name = NULL; |
3881 | msg.msg_control = NULL; | |
3882 | msg.msg_controllen = 0; | |
3883 | msg.msg_namelen = 0; | |
3884 | msg.msg_iocb = NULL; | |
3885 | msg.msg_flags = 0; | |
3886 | ||
3887 | flags = req->sr_msg.msg_flags; | |
3888 | if (flags & MSG_DONTWAIT) | |
3889 | req->flags |= REQ_F_NOWAIT; | |
3890 | else if (force_nonblock) | |
3891 | flags |= MSG_DONTWAIT; | |
3892 | ||
0b7b21e4 | 3893 | ret = sock_recvmsg(sock, &msg, flags); |
fddaface JA |
3894 | if (force_nonblock && ret == -EAGAIN) |
3895 | return -EAGAIN; | |
3896 | if (ret == -ERESTARTSYS) | |
3897 | ret = -EINTR; | |
3898 | } | |
3899 | ||
bcda7baa JA |
3900 | kfree(kbuf); |
3901 | req->flags &= ~REQ_F_NEED_CLEANUP; | |
3902 | __io_cqring_add_event(req, ret, cflags); | |
fddaface JA |
3903 | if (ret < 0) |
3904 | req_set_fail_links(req); | |
014db007 | 3905 | io_put_req(req); |
fddaface | 3906 | return 0; |
fddaface JA |
3907 | } |
3908 | ||
3529d8c2 | 3909 | static int io_accept_prep(struct io_kiocb *req, const struct io_uring_sqe *sqe) |
17f2fe35 | 3910 | { |
8ed8d3c3 JA |
3911 | struct io_accept *accept = &req->accept; |
3912 | ||
17f2fe35 JA |
3913 | if (unlikely(req->ctx->flags & (IORING_SETUP_IOPOLL|IORING_SETUP_SQPOLL))) |
3914 | return -EINVAL; | |
8042d6ce | 3915 | if (sqe->ioprio || sqe->len || sqe->buf_index) |
17f2fe35 JA |
3916 | return -EINVAL; |
3917 | ||
d55e5f5b JA |
3918 | accept->addr = u64_to_user_ptr(READ_ONCE(sqe->addr)); |
3919 | accept->addr_len = u64_to_user_ptr(READ_ONCE(sqe->addr2)); | |
8ed8d3c3 | 3920 | accept->flags = READ_ONCE(sqe->accept_flags); |
09952e3e | 3921 | accept->nofile = rlimit(RLIMIT_NOFILE); |
8ed8d3c3 | 3922 | return 0; |
8ed8d3c3 | 3923 | } |
17f2fe35 | 3924 | |
ac45abc0 | 3925 | static int io_accept(struct io_kiocb *req, bool force_nonblock) |
8ed8d3c3 JA |
3926 | { |
3927 | struct io_accept *accept = &req->accept; | |
ac45abc0 | 3928 | unsigned int file_flags = force_nonblock ? O_NONBLOCK : 0; |
8ed8d3c3 JA |
3929 | int ret; |
3930 | ||
e697deed JX |
3931 | if (req->file->f_flags & O_NONBLOCK) |
3932 | req->flags |= REQ_F_NOWAIT; | |
3933 | ||
8ed8d3c3 | 3934 | ret = __sys_accept4_file(req->file, file_flags, accept->addr, |
09952e3e JA |
3935 | accept->addr_len, accept->flags, |
3936 | accept->nofile); | |
8ed8d3c3 | 3937 | if (ret == -EAGAIN && force_nonblock) |
17f2fe35 | 3938 | return -EAGAIN; |
ac45abc0 PB |
3939 | if (ret < 0) { |
3940 | if (ret == -ERESTARTSYS) | |
3941 | ret = -EINTR; | |
4e88d6e7 | 3942 | req_set_fail_links(req); |
ac45abc0 | 3943 | } |
78e19bbe | 3944 | io_cqring_add_event(req, ret); |
014db007 | 3945 | io_put_req(req); |
17f2fe35 | 3946 | return 0; |
8ed8d3c3 JA |
3947 | } |
3948 | ||
3529d8c2 | 3949 | static int io_connect_prep(struct io_kiocb *req, const struct io_uring_sqe *sqe) |
f499a021 | 3950 | { |
3529d8c2 JA |
3951 | struct io_connect *conn = &req->connect; |
3952 | struct io_async_ctx *io = req->io; | |
f499a021 | 3953 | |
3fbb51c1 JA |
3954 | if (unlikely(req->ctx->flags & (IORING_SETUP_IOPOLL|IORING_SETUP_SQPOLL))) |
3955 | return -EINVAL; | |
3956 | if (sqe->ioprio || sqe->len || sqe->buf_index || sqe->rw_flags) | |
3957 | return -EINVAL; | |
3958 | ||
3529d8c2 JA |
3959 | conn->addr = u64_to_user_ptr(READ_ONCE(sqe->addr)); |
3960 | conn->addr_len = READ_ONCE(sqe->addr2); | |
3961 | ||
3962 | if (!io) | |
3963 | return 0; | |
3964 | ||
3965 | return move_addr_to_kernel(conn->addr, conn->addr_len, | |
3fbb51c1 | 3966 | &io->connect.address); |
f499a021 JA |
3967 | } |
3968 | ||
014db007 | 3969 | static int io_connect(struct io_kiocb *req, bool force_nonblock) |
f8e85cf2 | 3970 | { |
f499a021 | 3971 | struct io_async_ctx __io, *io; |
f8e85cf2 | 3972 | unsigned file_flags; |
3fbb51c1 | 3973 | int ret; |
f8e85cf2 | 3974 | |
f499a021 JA |
3975 | if (req->io) { |
3976 | io = req->io; | |
3977 | } else { | |
3529d8c2 JA |
3978 | ret = move_addr_to_kernel(req->connect.addr, |
3979 | req->connect.addr_len, | |
3980 | &__io.connect.address); | |
f499a021 JA |
3981 | if (ret) |
3982 | goto out; | |
3983 | io = &__io; | |
3984 | } | |
3985 | ||
3fbb51c1 JA |
3986 | file_flags = force_nonblock ? O_NONBLOCK : 0; |
3987 | ||
3988 | ret = __sys_connect_file(req->file, &io->connect.address, | |
3989 | req->connect.addr_len, file_flags); | |
87f80d62 | 3990 | if ((ret == -EAGAIN || ret == -EINPROGRESS) && force_nonblock) { |
b7bb4f7d JA |
3991 | if (req->io) |
3992 | return -EAGAIN; | |
3993 | if (io_alloc_async_ctx(req)) { | |
f499a021 JA |
3994 | ret = -ENOMEM; |
3995 | goto out; | |
3996 | } | |
b7bb4f7d | 3997 | memcpy(&req->io->connect, &__io.connect, sizeof(__io.connect)); |
f8e85cf2 | 3998 | return -EAGAIN; |
f499a021 | 3999 | } |
f8e85cf2 JA |
4000 | if (ret == -ERESTARTSYS) |
4001 | ret = -EINTR; | |
f499a021 | 4002 | out: |
4e88d6e7 JA |
4003 | if (ret < 0) |
4004 | req_set_fail_links(req); | |
f8e85cf2 | 4005 | io_cqring_add_event(req, ret); |
014db007 | 4006 | io_put_req(req); |
f8e85cf2 | 4007 | return 0; |
469956e8 Y |
4008 | } |
4009 | #else /* !CONFIG_NET */ | |
4010 | static int io_sendmsg_prep(struct io_kiocb *req, const struct io_uring_sqe *sqe) | |
4011 | { | |
f8e85cf2 | 4012 | return -EOPNOTSUPP; |
f8e85cf2 JA |
4013 | } |
4014 | ||
469956e8 Y |
4015 | static int io_sendmsg(struct io_kiocb *req, bool force_nonblock) |
4016 | { | |
4017 | return -EOPNOTSUPP; | |
4018 | } | |
4019 | ||
4020 | static int io_send(struct io_kiocb *req, bool force_nonblock) | |
4021 | { | |
4022 | return -EOPNOTSUPP; | |
4023 | } | |
4024 | ||
4025 | static int io_recvmsg_prep(struct io_kiocb *req, | |
4026 | const struct io_uring_sqe *sqe) | |
4027 | { | |
4028 | return -EOPNOTSUPP; | |
4029 | } | |
4030 | ||
4031 | static int io_recvmsg(struct io_kiocb *req, bool force_nonblock) | |
4032 | { | |
4033 | return -EOPNOTSUPP; | |
4034 | } | |
4035 | ||
4036 | static int io_recv(struct io_kiocb *req, bool force_nonblock) | |
4037 | { | |
4038 | return -EOPNOTSUPP; | |
4039 | } | |
4040 | ||
4041 | static int io_accept_prep(struct io_kiocb *req, const struct io_uring_sqe *sqe) | |
4042 | { | |
4043 | return -EOPNOTSUPP; | |
4044 | } | |
4045 | ||
4046 | static int io_accept(struct io_kiocb *req, bool force_nonblock) | |
4047 | { | |
4048 | return -EOPNOTSUPP; | |
4049 | } | |
4050 | ||
4051 | static int io_connect_prep(struct io_kiocb *req, const struct io_uring_sqe *sqe) | |
4052 | { | |
4053 | return -EOPNOTSUPP; | |
4054 | } | |
4055 | ||
4056 | static int io_connect(struct io_kiocb *req, bool force_nonblock) | |
4057 | { | |
f8e85cf2 | 4058 | return -EOPNOTSUPP; |
f8e85cf2 | 4059 | } |
469956e8 | 4060 | #endif /* CONFIG_NET */ |
f8e85cf2 | 4061 | |
d7718a9d JA |
4062 | struct io_poll_table { |
4063 | struct poll_table_struct pt; | |
4064 | struct io_kiocb *req; | |
4065 | int error; | |
4066 | }; | |
4067 | ||
d7718a9d JA |
4068 | static int __io_async_wake(struct io_kiocb *req, struct io_poll_iocb *poll, |
4069 | __poll_t mask, task_work_func_t func) | |
4070 | { | |
4071 | struct task_struct *tsk; | |
aa96bf8a | 4072 | int ret; |
d7718a9d JA |
4073 | |
4074 | /* for instances that support it check for an event match first: */ | |
4075 | if (mask && !(mask & poll->events)) | |
4076 | return 0; | |
4077 | ||
4078 | trace_io_uring_task_add(req->ctx, req->opcode, req->user_data, mask); | |
4079 | ||
4080 | list_del_init(&poll->wait.entry); | |
4081 | ||
4082 | tsk = req->task; | |
4083 | req->result = mask; | |
4084 | init_task_work(&req->task_work, func); | |
4085 | /* | |
e3aabf95 JA |
4086 | * If this fails, then the task is exiting. When a task exits, the |
4087 | * work gets canceled, so just cancel this request as well instead | |
4088 | * of executing it. We can't safely execute it anyway, as we may not | |
4089 | * have the needed state needed for it anyway. | |
d7718a9d | 4090 | */ |
aa96bf8a JA |
4091 | ret = task_work_add(tsk, &req->task_work, true); |
4092 | if (unlikely(ret)) { | |
e3aabf95 | 4093 | WRITE_ONCE(poll->canceled, true); |
aa96bf8a JA |
4094 | tsk = io_wq_get_task(req->ctx->io_wq); |
4095 | task_work_add(tsk, &req->task_work, true); | |
4096 | } | |
d7718a9d JA |
4097 | wake_up_process(tsk); |
4098 | return 1; | |
4099 | } | |
4100 | ||
74ce6ce4 JA |
4101 | static bool io_poll_rewait(struct io_kiocb *req, struct io_poll_iocb *poll) |
4102 | __acquires(&req->ctx->completion_lock) | |
4103 | { | |
4104 | struct io_ring_ctx *ctx = req->ctx; | |
4105 | ||
4106 | if (!req->result && !READ_ONCE(poll->canceled)) { | |
4107 | struct poll_table_struct pt = { ._key = poll->events }; | |
4108 | ||
4109 | req->result = vfs_poll(req->file, &pt) & poll->events; | |
4110 | } | |
4111 | ||
4112 | spin_lock_irq(&ctx->completion_lock); | |
4113 | if (!req->result && !READ_ONCE(poll->canceled)) { | |
4114 | add_wait_queue(poll->head, &poll->wait); | |
4115 | return true; | |
4116 | } | |
4117 | ||
4118 | return false; | |
4119 | } | |
4120 | ||
18bceab1 JA |
4121 | static void io_poll_remove_double(struct io_kiocb *req) |
4122 | { | |
4123 | struct io_poll_iocb *poll = (struct io_poll_iocb *) req->io; | |
4124 | ||
4125 | lockdep_assert_held(&req->ctx->completion_lock); | |
4126 | ||
4127 | if (poll && poll->head) { | |
4128 | struct wait_queue_head *head = poll->head; | |
4129 | ||
4130 | spin_lock(&head->lock); | |
4131 | list_del_init(&poll->wait.entry); | |
4132 | if (poll->wait.private) | |
4133 | refcount_dec(&req->refs); | |
4134 | poll->head = NULL; | |
4135 | spin_unlock(&head->lock); | |
4136 | } | |
4137 | } | |
4138 | ||
4139 | static void io_poll_complete(struct io_kiocb *req, __poll_t mask, int error) | |
4140 | { | |
4141 | struct io_ring_ctx *ctx = req->ctx; | |
4142 | ||
4143 | io_poll_remove_double(req); | |
4144 | req->poll.done = true; | |
4145 | io_cqring_fill_event(req, error ? error : mangle_poll(mask)); | |
4146 | io_commit_cqring(ctx); | |
4147 | } | |
4148 | ||
4149 | static void io_poll_task_handler(struct io_kiocb *req, struct io_kiocb **nxt) | |
4150 | { | |
4151 | struct io_ring_ctx *ctx = req->ctx; | |
4152 | ||
4153 | if (io_poll_rewait(req, &req->poll)) { | |
4154 | spin_unlock_irq(&ctx->completion_lock); | |
4155 | return; | |
4156 | } | |
4157 | ||
4158 | hash_del(&req->hash_node); | |
4159 | io_poll_complete(req, req->result, 0); | |
4160 | req->flags |= REQ_F_COMP_LOCKED; | |
4161 | io_put_req_find_next(req, nxt); | |
4162 | spin_unlock_irq(&ctx->completion_lock); | |
4163 | ||
4164 | io_cqring_ev_posted(ctx); | |
4165 | } | |
4166 | ||
4167 | static void io_poll_task_func(struct callback_head *cb) | |
4168 | { | |
4169 | struct io_kiocb *req = container_of(cb, struct io_kiocb, task_work); | |
4170 | struct io_kiocb *nxt = NULL; | |
4171 | ||
4172 | io_poll_task_handler(req, &nxt); | |
4173 | if (nxt) { | |
4174 | struct io_ring_ctx *ctx = nxt->ctx; | |
4175 | ||
4176 | mutex_lock(&ctx->uring_lock); | |
4177 | __io_queue_sqe(nxt, NULL); | |
4178 | mutex_unlock(&ctx->uring_lock); | |
4179 | } | |
4180 | } | |
4181 | ||
4182 | static int io_poll_double_wake(struct wait_queue_entry *wait, unsigned mode, | |
4183 | int sync, void *key) | |
4184 | { | |
4185 | struct io_kiocb *req = wait->private; | |
4186 | struct io_poll_iocb *poll = (struct io_poll_iocb *) req->io; | |
4187 | __poll_t mask = key_to_poll(key); | |
4188 | ||
4189 | /* for instances that support it check for an event match first: */ | |
4190 | if (mask && !(mask & poll->events)) | |
4191 | return 0; | |
4192 | ||
4193 | if (req->poll.head) { | |
4194 | bool done; | |
4195 | ||
4196 | spin_lock(&req->poll.head->lock); | |
4197 | done = list_empty(&req->poll.wait.entry); | |
4198 | if (!done) | |
4199 | list_del_init(&req->poll.wait.entry); | |
4200 | spin_unlock(&req->poll.head->lock); | |
4201 | if (!done) | |
4202 | __io_async_wake(req, poll, mask, io_poll_task_func); | |
4203 | } | |
4204 | refcount_dec(&req->refs); | |
4205 | return 1; | |
4206 | } | |
4207 | ||
4208 | static void io_init_poll_iocb(struct io_poll_iocb *poll, __poll_t events, | |
4209 | wait_queue_func_t wake_func) | |
4210 | { | |
4211 | poll->head = NULL; | |
4212 | poll->done = false; | |
4213 | poll->canceled = false; | |
4214 | poll->events = events; | |
4215 | INIT_LIST_HEAD(&poll->wait.entry); | |
4216 | init_waitqueue_func_entry(&poll->wait, wake_func); | |
4217 | } | |
4218 | ||
4219 | static void __io_queue_proc(struct io_poll_iocb *poll, struct io_poll_table *pt, | |
4220 | struct wait_queue_head *head) | |
4221 | { | |
4222 | struct io_kiocb *req = pt->req; | |
4223 | ||
4224 | /* | |
4225 | * If poll->head is already set, it's because the file being polled | |
4226 | * uses multiple waitqueues for poll handling (eg one for read, one | |
4227 | * for write). Setup a separate io_poll_iocb if this happens. | |
4228 | */ | |
4229 | if (unlikely(poll->head)) { | |
4230 | /* already have a 2nd entry, fail a third attempt */ | |
4231 | if (req->io) { | |
4232 | pt->error = -EINVAL; | |
4233 | return; | |
4234 | } | |
4235 | poll = kmalloc(sizeof(*poll), GFP_ATOMIC); | |
4236 | if (!poll) { | |
4237 | pt->error = -ENOMEM; | |
4238 | return; | |
4239 | } | |
4240 | io_init_poll_iocb(poll, req->poll.events, io_poll_double_wake); | |
4241 | refcount_inc(&req->refs); | |
4242 | poll->wait.private = req; | |
4243 | req->io = (void *) poll; | |
4244 | } | |
4245 | ||
4246 | pt->error = 0; | |
4247 | poll->head = head; | |
4248 | add_wait_queue(head, &poll->wait); | |
4249 | } | |
4250 | ||
4251 | static void io_async_queue_proc(struct file *file, struct wait_queue_head *head, | |
4252 | struct poll_table_struct *p) | |
4253 | { | |
4254 | struct io_poll_table *pt = container_of(p, struct io_poll_table, pt); | |
4255 | ||
4256 | __io_queue_proc(&pt->req->apoll->poll, pt, head); | |
4257 | } | |
4258 | ||
9d8426a0 JA |
4259 | static void io_sq_thread_drop_mm(struct io_ring_ctx *ctx) |
4260 | { | |
4261 | struct mm_struct *mm = current->mm; | |
4262 | ||
4263 | if (mm) { | |
4264 | kthread_unuse_mm(mm); | |
4265 | mmput(mm); | |
4266 | } | |
4267 | } | |
4268 | ||
4269 | static int io_sq_thread_acquire_mm(struct io_ring_ctx *ctx, | |
4270 | struct io_kiocb *req) | |
4271 | { | |
4272 | if (io_op_defs[req->opcode].needs_mm && !current->mm) { | |
4273 | if (unlikely(!mmget_not_zero(ctx->sqo_mm))) | |
4274 | return -EFAULT; | |
4275 | kthread_use_mm(ctx->sqo_mm); | |
4276 | } | |
4277 | ||
4278 | return 0; | |
4279 | } | |
4280 | ||
d7718a9d JA |
4281 | static void io_async_task_func(struct callback_head *cb) |
4282 | { | |
4283 | struct io_kiocb *req = container_of(cb, struct io_kiocb, task_work); | |
4284 | struct async_poll *apoll = req->apoll; | |
4285 | struct io_ring_ctx *ctx = req->ctx; | |
31067255 | 4286 | bool canceled = false; |
d7718a9d JA |
4287 | |
4288 | trace_io_uring_task_run(req->ctx, req->opcode, req->user_data); | |
4289 | ||
74ce6ce4 | 4290 | if (io_poll_rewait(req, &apoll->poll)) { |
d7718a9d | 4291 | spin_unlock_irq(&ctx->completion_lock); |
74ce6ce4 | 4292 | return; |
d7718a9d JA |
4293 | } |
4294 | ||
31067255 JA |
4295 | /* If req is still hashed, it cannot have been canceled. Don't check. */ |
4296 | if (hash_hashed(&req->hash_node)) { | |
74ce6ce4 | 4297 | hash_del(&req->hash_node); |
31067255 JA |
4298 | } else { |
4299 | canceled = READ_ONCE(apoll->poll.canceled); | |
4300 | if (canceled) { | |
4301 | io_cqring_fill_event(req, -ECANCELED); | |
4302 | io_commit_cqring(ctx); | |
4303 | } | |
2bae047e JA |
4304 | } |
4305 | ||
74ce6ce4 JA |
4306 | spin_unlock_irq(&ctx->completion_lock); |
4307 | ||
44575a67 | 4308 | /* restore ->work in case we need to retry again */ |
405a5d2b XW |
4309 | if (req->flags & REQ_F_WORK_INITIALIZED) |
4310 | memcpy(&req->work, &apoll->work, sizeof(req->work)); | |
31067255 | 4311 | kfree(apoll); |
44575a67 | 4312 | |
31067255 JA |
4313 | if (!canceled) { |
4314 | __set_current_state(TASK_RUNNING); | |
9d8426a0 JA |
4315 | if (io_sq_thread_acquire_mm(ctx, req)) { |
4316 | io_cqring_add_event(req, -EFAULT); | |
4317 | goto end_req; | |
4318 | } | |
31067255 JA |
4319 | mutex_lock(&ctx->uring_lock); |
4320 | __io_queue_sqe(req, NULL); | |
4321 | mutex_unlock(&ctx->uring_lock); | |
4322 | } else { | |
2bae047e | 4323 | io_cqring_ev_posted(ctx); |
9d8426a0 | 4324 | end_req: |
2bae047e | 4325 | req_set_fail_links(req); |
44575a67 | 4326 | io_double_put_req(req); |
2bae047e | 4327 | } |
d7718a9d JA |
4328 | } |
4329 | ||
4330 | static int io_async_wake(struct wait_queue_entry *wait, unsigned mode, int sync, | |
4331 | void *key) | |
4332 | { | |
4333 | struct io_kiocb *req = wait->private; | |
4334 | struct io_poll_iocb *poll = &req->apoll->poll; | |
4335 | ||
4336 | trace_io_uring_poll_wake(req->ctx, req->opcode, req->user_data, | |
4337 | key_to_poll(key)); | |
4338 | ||
4339 | return __io_async_wake(req, poll, key_to_poll(key), io_async_task_func); | |
4340 | } | |
4341 | ||
4342 | static void io_poll_req_insert(struct io_kiocb *req) | |
4343 | { | |
4344 | struct io_ring_ctx *ctx = req->ctx; | |
4345 | struct hlist_head *list; | |
4346 | ||
4347 | list = &ctx->cancel_hash[hash_long(req->user_data, ctx->cancel_hash_bits)]; | |
4348 | hlist_add_head(&req->hash_node, list); | |
4349 | } | |
4350 | ||
4351 | static __poll_t __io_arm_poll_handler(struct io_kiocb *req, | |
4352 | struct io_poll_iocb *poll, | |
4353 | struct io_poll_table *ipt, __poll_t mask, | |
4354 | wait_queue_func_t wake_func) | |
4355 | __acquires(&ctx->completion_lock) | |
4356 | { | |
4357 | struct io_ring_ctx *ctx = req->ctx; | |
4358 | bool cancel = false; | |
4359 | ||
4360 | poll->file = req->file; | |
18bceab1 JA |
4361 | io_init_poll_iocb(poll, mask, wake_func); |
4362 | poll->wait.private = req; | |
d7718a9d JA |
4363 | |
4364 | ipt->pt._key = mask; | |
4365 | ipt->req = req; | |
4366 | ipt->error = -EINVAL; | |
4367 | ||
d7718a9d JA |
4368 | mask = vfs_poll(req->file, &ipt->pt) & poll->events; |
4369 | ||
4370 | spin_lock_irq(&ctx->completion_lock); | |
4371 | if (likely(poll->head)) { | |
4372 | spin_lock(&poll->head->lock); | |
4373 | if (unlikely(list_empty(&poll->wait.entry))) { | |
4374 | if (ipt->error) | |
4375 | cancel = true; | |
4376 | ipt->error = 0; | |
4377 | mask = 0; | |
4378 | } | |
4379 | if (mask || ipt->error) | |
4380 | list_del_init(&poll->wait.entry); | |
4381 | else if (cancel) | |
4382 | WRITE_ONCE(poll->canceled, true); | |
4383 | else if (!poll->done) /* actually waiting for an event */ | |
4384 | io_poll_req_insert(req); | |
4385 | spin_unlock(&poll->head->lock); | |
4386 | } | |
4387 | ||
4388 | return mask; | |
4389 | } | |
4390 | ||
4391 | static bool io_arm_poll_handler(struct io_kiocb *req) | |
4392 | { | |
4393 | const struct io_op_def *def = &io_op_defs[req->opcode]; | |
4394 | struct io_ring_ctx *ctx = req->ctx; | |
4395 | struct async_poll *apoll; | |
4396 | struct io_poll_table ipt; | |
4397 | __poll_t mask, ret; | |
18bceab1 | 4398 | bool had_io; |
d7718a9d JA |
4399 | |
4400 | if (!req->file || !file_can_poll(req->file)) | |
4401 | return false; | |
4402 | if (req->flags & (REQ_F_MUST_PUNT | REQ_F_POLLED)) | |
4403 | return false; | |
4404 | if (!def->pollin && !def->pollout) | |
4405 | return false; | |
4406 | ||
4407 | apoll = kmalloc(sizeof(*apoll), GFP_ATOMIC); | |
4408 | if (unlikely(!apoll)) | |
4409 | return false; | |
4410 | ||
4411 | req->flags |= REQ_F_POLLED; | |
405a5d2b XW |
4412 | if (req->flags & REQ_F_WORK_INITIALIZED) |
4413 | memcpy(&apoll->work, &req->work, sizeof(req->work)); | |
18bceab1 | 4414 | had_io = req->io != NULL; |
d7718a9d | 4415 | |
4dd2824d | 4416 | io_get_req_task(req); |
d7718a9d JA |
4417 | req->apoll = apoll; |
4418 | INIT_HLIST_NODE(&req->hash_node); | |
4419 | ||
8755d97a | 4420 | mask = 0; |
d7718a9d | 4421 | if (def->pollin) |
8755d97a | 4422 | mask |= POLLIN | POLLRDNORM; |
d7718a9d JA |
4423 | if (def->pollout) |
4424 | mask |= POLLOUT | POLLWRNORM; | |
4425 | mask |= POLLERR | POLLPRI; | |
4426 | ||
4427 | ipt.pt._qproc = io_async_queue_proc; | |
4428 | ||
4429 | ret = __io_arm_poll_handler(req, &apoll->poll, &ipt, mask, | |
4430 | io_async_wake); | |
4431 | if (ret) { | |
4432 | ipt.error = 0; | |
18bceab1 JA |
4433 | /* only remove double add if we did it here */ |
4434 | if (!had_io) | |
4435 | io_poll_remove_double(req); | |
d7718a9d | 4436 | spin_unlock_irq(&ctx->completion_lock); |
405a5d2b XW |
4437 | if (req->flags & REQ_F_WORK_INITIALIZED) |
4438 | memcpy(&req->work, &apoll->work, sizeof(req->work)); | |
d7718a9d JA |
4439 | kfree(apoll); |
4440 | return false; | |
4441 | } | |
4442 | spin_unlock_irq(&ctx->completion_lock); | |
4443 | trace_io_uring_poll_arm(ctx, req->opcode, req->user_data, mask, | |
4444 | apoll->poll.events); | |
4445 | return true; | |
4446 | } | |
4447 | ||
4448 | static bool __io_poll_remove_one(struct io_kiocb *req, | |
4449 | struct io_poll_iocb *poll) | |
221c5eb2 | 4450 | { |
b41e9852 | 4451 | bool do_complete = false; |
221c5eb2 JA |
4452 | |
4453 | spin_lock(&poll->head->lock); | |
4454 | WRITE_ONCE(poll->canceled, true); | |
392edb45 JA |
4455 | if (!list_empty(&poll->wait.entry)) { |
4456 | list_del_init(&poll->wait.entry); | |
b41e9852 | 4457 | do_complete = true; |
221c5eb2 JA |
4458 | } |
4459 | spin_unlock(&poll->head->lock); | |
3bfa5bcb | 4460 | hash_del(&req->hash_node); |
d7718a9d JA |
4461 | return do_complete; |
4462 | } | |
4463 | ||
4464 | static bool io_poll_remove_one(struct io_kiocb *req) | |
4465 | { | |
4466 | bool do_complete; | |
4467 | ||
4468 | if (req->opcode == IORING_OP_POLL_ADD) { | |
18bceab1 | 4469 | io_poll_remove_double(req); |
d7718a9d JA |
4470 | do_complete = __io_poll_remove_one(req, &req->poll); |
4471 | } else { | |
3bfa5bcb JA |
4472 | struct async_poll *apoll = req->apoll; |
4473 | ||
d7718a9d | 4474 | /* non-poll requests have submit ref still */ |
3bfa5bcb JA |
4475 | do_complete = __io_poll_remove_one(req, &apoll->poll); |
4476 | if (do_complete) { | |
d7718a9d | 4477 | io_put_req(req); |
3bfa5bcb JA |
4478 | /* |
4479 | * restore ->work because we will call | |
4480 | * io_req_work_drop_env below when dropping the | |
4481 | * final reference. | |
4482 | */ | |
405a5d2b XW |
4483 | if (req->flags & REQ_F_WORK_INITIALIZED) |
4484 | memcpy(&req->work, &apoll->work, | |
4485 | sizeof(req->work)); | |
3bfa5bcb JA |
4486 | kfree(apoll); |
4487 | } | |
b1f573bd XW |
4488 | } |
4489 | ||
b41e9852 JA |
4490 | if (do_complete) { |
4491 | io_cqring_fill_event(req, -ECANCELED); | |
4492 | io_commit_cqring(req->ctx); | |
4493 | req->flags |= REQ_F_COMP_LOCKED; | |
4494 | io_put_req(req); | |
4495 | } | |
4496 | ||
4497 | return do_complete; | |
221c5eb2 JA |
4498 | } |
4499 | ||
4500 | static void io_poll_remove_all(struct io_ring_ctx *ctx) | |
4501 | { | |
78076bb6 | 4502 | struct hlist_node *tmp; |
221c5eb2 | 4503 | struct io_kiocb *req; |
8e2e1faf | 4504 | int posted = 0, i; |
221c5eb2 JA |
4505 | |
4506 | spin_lock_irq(&ctx->completion_lock); | |
78076bb6 JA |
4507 | for (i = 0; i < (1U << ctx->cancel_hash_bits); i++) { |
4508 | struct hlist_head *list; | |
4509 | ||
4510 | list = &ctx->cancel_hash[i]; | |
4511 | hlist_for_each_entry_safe(req, tmp, list, hash_node) | |
8e2e1faf | 4512 | posted += io_poll_remove_one(req); |
221c5eb2 JA |
4513 | } |
4514 | spin_unlock_irq(&ctx->completion_lock); | |
b41e9852 | 4515 | |
8e2e1faf JA |
4516 | if (posted) |
4517 | io_cqring_ev_posted(ctx); | |
221c5eb2 JA |
4518 | } |
4519 | ||
47f46768 JA |
4520 | static int io_poll_cancel(struct io_ring_ctx *ctx, __u64 sqe_addr) |
4521 | { | |
78076bb6 | 4522 | struct hlist_head *list; |
47f46768 JA |
4523 | struct io_kiocb *req; |
4524 | ||
78076bb6 JA |
4525 | list = &ctx->cancel_hash[hash_long(sqe_addr, ctx->cancel_hash_bits)]; |
4526 | hlist_for_each_entry(req, list, hash_node) { | |
b41e9852 JA |
4527 | if (sqe_addr != req->user_data) |
4528 | continue; | |
4529 | if (io_poll_remove_one(req)) | |
eac406c6 | 4530 | return 0; |
b41e9852 | 4531 | return -EALREADY; |
47f46768 JA |
4532 | } |
4533 | ||
4534 | return -ENOENT; | |
4535 | } | |
4536 | ||
3529d8c2 JA |
4537 | static int io_poll_remove_prep(struct io_kiocb *req, |
4538 | const struct io_uring_sqe *sqe) | |
0969e783 | 4539 | { |
0969e783 JA |
4540 | if (unlikely(req->ctx->flags & IORING_SETUP_IOPOLL)) |
4541 | return -EINVAL; | |
4542 | if (sqe->ioprio || sqe->off || sqe->len || sqe->buf_index || | |
4543 | sqe->poll_events) | |
4544 | return -EINVAL; | |
4545 | ||
4546 | req->poll.addr = READ_ONCE(sqe->addr); | |
0969e783 JA |
4547 | return 0; |
4548 | } | |
4549 | ||
221c5eb2 JA |
4550 | /* |
4551 | * Find a running poll command that matches one specified in sqe->addr, | |
4552 | * and remove it if found. | |
4553 | */ | |
fc4df999 | 4554 | static int io_poll_remove(struct io_kiocb *req) |
221c5eb2 JA |
4555 | { |
4556 | struct io_ring_ctx *ctx = req->ctx; | |
0969e783 | 4557 | u64 addr; |
47f46768 | 4558 | int ret; |
221c5eb2 | 4559 | |
0969e783 | 4560 | addr = req->poll.addr; |
221c5eb2 | 4561 | spin_lock_irq(&ctx->completion_lock); |
0969e783 | 4562 | ret = io_poll_cancel(ctx, addr); |
221c5eb2 JA |
4563 | spin_unlock_irq(&ctx->completion_lock); |
4564 | ||
78e19bbe | 4565 | io_cqring_add_event(req, ret); |
4e88d6e7 JA |
4566 | if (ret < 0) |
4567 | req_set_fail_links(req); | |
e65ef56d | 4568 | io_put_req(req); |
221c5eb2 JA |
4569 | return 0; |
4570 | } | |
4571 | ||
221c5eb2 JA |
4572 | static int io_poll_wake(struct wait_queue_entry *wait, unsigned mode, int sync, |
4573 | void *key) | |
4574 | { | |
c2f2eb7d JA |
4575 | struct io_kiocb *req = wait->private; |
4576 | struct io_poll_iocb *poll = &req->poll; | |
221c5eb2 | 4577 | |
d7718a9d | 4578 | return __io_async_wake(req, poll, key_to_poll(key), io_poll_task_func); |
221c5eb2 JA |
4579 | } |
4580 | ||
221c5eb2 JA |
4581 | static void io_poll_queue_proc(struct file *file, struct wait_queue_head *head, |
4582 | struct poll_table_struct *p) | |
4583 | { | |
4584 | struct io_poll_table *pt = container_of(p, struct io_poll_table, pt); | |
4585 | ||
d7718a9d | 4586 | __io_queue_proc(&pt->req->poll, pt, head); |
eac406c6 JA |
4587 | } |
4588 | ||
3529d8c2 | 4589 | static int io_poll_add_prep(struct io_kiocb *req, const struct io_uring_sqe *sqe) |
221c5eb2 JA |
4590 | { |
4591 | struct io_poll_iocb *poll = &req->poll; | |
221c5eb2 | 4592 | u16 events; |
221c5eb2 JA |
4593 | |
4594 | if (unlikely(req->ctx->flags & IORING_SETUP_IOPOLL)) | |
4595 | return -EINVAL; | |
4596 | if (sqe->addr || sqe->ioprio || sqe->off || sqe->len || sqe->buf_index) | |
4597 | return -EINVAL; | |
09bb8394 JA |
4598 | if (!poll->file) |
4599 | return -EBADF; | |
221c5eb2 | 4600 | |
221c5eb2 JA |
4601 | events = READ_ONCE(sqe->poll_events); |
4602 | poll->events = demangle_poll(events) | EPOLLERR | EPOLLHUP; | |
b41e9852 | 4603 | |
4dd2824d | 4604 | io_get_req_task(req); |
0969e783 JA |
4605 | return 0; |
4606 | } | |
4607 | ||
014db007 | 4608 | static int io_poll_add(struct io_kiocb *req) |
0969e783 JA |
4609 | { |
4610 | struct io_poll_iocb *poll = &req->poll; | |
4611 | struct io_ring_ctx *ctx = req->ctx; | |
4612 | struct io_poll_table ipt; | |
0969e783 | 4613 | __poll_t mask; |
0969e783 | 4614 | |
78076bb6 | 4615 | INIT_HLIST_NODE(&req->hash_node); |
36703247 | 4616 | INIT_LIST_HEAD(&req->list); |
d7718a9d | 4617 | ipt.pt._qproc = io_poll_queue_proc; |
36703247 | 4618 | |
d7718a9d JA |
4619 | mask = __io_arm_poll_handler(req, &req->poll, &ipt, poll->events, |
4620 | io_poll_wake); | |
221c5eb2 | 4621 | |
8c838788 | 4622 | if (mask) { /* no async, we'd stolen it */ |
221c5eb2 | 4623 | ipt.error = 0; |
b0dd8a41 | 4624 | io_poll_complete(req, mask, 0); |
221c5eb2 | 4625 | } |
221c5eb2 JA |
4626 | spin_unlock_irq(&ctx->completion_lock); |
4627 | ||
8c838788 JA |
4628 | if (mask) { |
4629 | io_cqring_ev_posted(ctx); | |
014db007 | 4630 | io_put_req(req); |
221c5eb2 | 4631 | } |
8c838788 | 4632 | return ipt.error; |
221c5eb2 JA |
4633 | } |
4634 | ||
5262f567 JA |
4635 | static enum hrtimer_restart io_timeout_fn(struct hrtimer *timer) |
4636 | { | |
ad8a48ac JA |
4637 | struct io_timeout_data *data = container_of(timer, |
4638 | struct io_timeout_data, timer); | |
4639 | struct io_kiocb *req = data->req; | |
4640 | struct io_ring_ctx *ctx = req->ctx; | |
5262f567 JA |
4641 | unsigned long flags; |
4642 | ||
5262f567 JA |
4643 | atomic_inc(&ctx->cq_timeouts); |
4644 | ||
4645 | spin_lock_irqsave(&ctx->completion_lock, flags); | |
ef03681a | 4646 | /* |
11365043 JA |
4647 | * We could be racing with timeout deletion. If the list is empty, |
4648 | * then timeout lookup already found it and will be handling it. | |
ef03681a | 4649 | */ |
bfe68a22 | 4650 | if (!list_empty(&req->list)) |
11365043 | 4651 | list_del_init(&req->list); |
5262f567 | 4652 | |
78e19bbe | 4653 | io_cqring_fill_event(req, -ETIME); |
5262f567 JA |
4654 | io_commit_cqring(ctx); |
4655 | spin_unlock_irqrestore(&ctx->completion_lock, flags); | |
4656 | ||
4657 | io_cqring_ev_posted(ctx); | |
4e88d6e7 | 4658 | req_set_fail_links(req); |
5262f567 JA |
4659 | io_put_req(req); |
4660 | return HRTIMER_NORESTART; | |
4661 | } | |
4662 | ||
47f46768 JA |
4663 | static int io_timeout_cancel(struct io_ring_ctx *ctx, __u64 user_data) |
4664 | { | |
4665 | struct io_kiocb *req; | |
4666 | int ret = -ENOENT; | |
4667 | ||
4668 | list_for_each_entry(req, &ctx->timeout_list, list) { | |
4669 | if (user_data == req->user_data) { | |
4670 | list_del_init(&req->list); | |
4671 | ret = 0; | |
4672 | break; | |
4673 | } | |
4674 | } | |
4675 | ||
4676 | if (ret == -ENOENT) | |
4677 | return ret; | |
4678 | ||
2d28390a | 4679 | ret = hrtimer_try_to_cancel(&req->io->timeout.timer); |
47f46768 JA |
4680 | if (ret == -1) |
4681 | return -EALREADY; | |
4682 | ||
4e88d6e7 | 4683 | req_set_fail_links(req); |
47f46768 JA |
4684 | io_cqring_fill_event(req, -ECANCELED); |
4685 | io_put_req(req); | |
4686 | return 0; | |
4687 | } | |
4688 | ||
3529d8c2 JA |
4689 | static int io_timeout_remove_prep(struct io_kiocb *req, |
4690 | const struct io_uring_sqe *sqe) | |
b29472ee | 4691 | { |
b29472ee JA |
4692 | if (unlikely(req->ctx->flags & IORING_SETUP_IOPOLL)) |
4693 | return -EINVAL; | |
4694 | if (sqe->flags || sqe->ioprio || sqe->buf_index || sqe->len) | |
4695 | return -EINVAL; | |
4696 | ||
4697 | req->timeout.addr = READ_ONCE(sqe->addr); | |
4698 | req->timeout.flags = READ_ONCE(sqe->timeout_flags); | |
4699 | if (req->timeout.flags) | |
4700 | return -EINVAL; | |
4701 | ||
b29472ee JA |
4702 | return 0; |
4703 | } | |
4704 | ||
11365043 JA |
4705 | /* |
4706 | * Remove or update an existing timeout command | |
4707 | */ | |
fc4df999 | 4708 | static int io_timeout_remove(struct io_kiocb *req) |
11365043 JA |
4709 | { |
4710 | struct io_ring_ctx *ctx = req->ctx; | |
47f46768 | 4711 | int ret; |
11365043 | 4712 | |
11365043 | 4713 | spin_lock_irq(&ctx->completion_lock); |
b29472ee | 4714 | ret = io_timeout_cancel(ctx, req->timeout.addr); |
11365043 | 4715 | |
47f46768 | 4716 | io_cqring_fill_event(req, ret); |
11365043 JA |
4717 | io_commit_cqring(ctx); |
4718 | spin_unlock_irq(&ctx->completion_lock); | |
5262f567 | 4719 | io_cqring_ev_posted(ctx); |
4e88d6e7 JA |
4720 | if (ret < 0) |
4721 | req_set_fail_links(req); | |
ec9c02ad | 4722 | io_put_req(req); |
11365043 | 4723 | return 0; |
5262f567 JA |
4724 | } |
4725 | ||
3529d8c2 | 4726 | static int io_timeout_prep(struct io_kiocb *req, const struct io_uring_sqe *sqe, |
2d28390a | 4727 | bool is_timeout_link) |
5262f567 | 4728 | { |
ad8a48ac | 4729 | struct io_timeout_data *data; |
a41525ab | 4730 | unsigned flags; |
56080b02 | 4731 | u32 off = READ_ONCE(sqe->off); |
5262f567 | 4732 | |
ad8a48ac | 4733 | if (unlikely(req->ctx->flags & IORING_SETUP_IOPOLL)) |
5262f567 | 4734 | return -EINVAL; |
ad8a48ac | 4735 | if (sqe->ioprio || sqe->buf_index || sqe->len != 1) |
a41525ab | 4736 | return -EINVAL; |
56080b02 | 4737 | if (off && is_timeout_link) |
2d28390a | 4738 | return -EINVAL; |
a41525ab JA |
4739 | flags = READ_ONCE(sqe->timeout_flags); |
4740 | if (flags & ~IORING_TIMEOUT_ABS) | |
5262f567 | 4741 | return -EINVAL; |
bdf20073 | 4742 | |
bfe68a22 | 4743 | req->timeout.off = off; |
26a61679 | 4744 | |
3529d8c2 | 4745 | if (!req->io && io_alloc_async_ctx(req)) |
26a61679 JA |
4746 | return -ENOMEM; |
4747 | ||
4748 | data = &req->io->timeout; | |
ad8a48ac | 4749 | data->req = req; |
ad8a48ac JA |
4750 | req->flags |= REQ_F_TIMEOUT; |
4751 | ||
4752 | if (get_timespec64(&data->ts, u64_to_user_ptr(sqe->addr))) | |
5262f567 JA |
4753 | return -EFAULT; |
4754 | ||
11365043 | 4755 | if (flags & IORING_TIMEOUT_ABS) |
ad8a48ac | 4756 | data->mode = HRTIMER_MODE_ABS; |
11365043 | 4757 | else |
ad8a48ac | 4758 | data->mode = HRTIMER_MODE_REL; |
11365043 | 4759 | |
ad8a48ac JA |
4760 | hrtimer_init(&data->timer, CLOCK_MONOTONIC, data->mode); |
4761 | return 0; | |
4762 | } | |
4763 | ||
fc4df999 | 4764 | static int io_timeout(struct io_kiocb *req) |
ad8a48ac | 4765 | { |
ad8a48ac | 4766 | struct io_ring_ctx *ctx = req->ctx; |
bfe68a22 | 4767 | struct io_timeout_data *data = &req->io->timeout; |
ad8a48ac | 4768 | struct list_head *entry; |
bfe68a22 | 4769 | u32 tail, off = req->timeout.off; |
ad8a48ac | 4770 | |
733f5c95 | 4771 | spin_lock_irq(&ctx->completion_lock); |
93bd25bb | 4772 | |
5262f567 JA |
4773 | /* |
4774 | * sqe->off holds how many events that need to occur for this | |
93bd25bb JA |
4775 | * timeout event to be satisfied. If it isn't set, then this is |
4776 | * a pure timeout request, sequence isn't used. | |
5262f567 | 4777 | */ |
bfe68a22 | 4778 | if (!off) { |
93bd25bb | 4779 | req->flags |= REQ_F_TIMEOUT_NOSEQ; |
93bd25bb JA |
4780 | entry = ctx->timeout_list.prev; |
4781 | goto add; | |
4782 | } | |
5262f567 | 4783 | |
bfe68a22 PB |
4784 | tail = ctx->cached_cq_tail - atomic_read(&ctx->cq_timeouts); |
4785 | req->timeout.target_seq = tail + off; | |
5262f567 JA |
4786 | |
4787 | /* | |
4788 | * Insertion sort, ensuring the first entry in the list is always | |
4789 | * the one we need first. | |
4790 | */ | |
5262f567 JA |
4791 | list_for_each_prev(entry, &ctx->timeout_list) { |
4792 | struct io_kiocb *nxt = list_entry(entry, struct io_kiocb, list); | |
5262f567 | 4793 | |
93bd25bb JA |
4794 | if (nxt->flags & REQ_F_TIMEOUT_NOSEQ) |
4795 | continue; | |
bfe68a22 PB |
4796 | /* nxt.seq is behind @tail, otherwise would've been completed */ |
4797 | if (off >= nxt->timeout.target_seq - tail) | |
5262f567 JA |
4798 | break; |
4799 | } | |
93bd25bb | 4800 | add: |
5262f567 | 4801 | list_add(&req->list, entry); |
ad8a48ac JA |
4802 | data->timer.function = io_timeout_fn; |
4803 | hrtimer_start(&data->timer, timespec64_to_ktime(data->ts), data->mode); | |
5262f567 | 4804 | spin_unlock_irq(&ctx->completion_lock); |
5262f567 JA |
4805 | return 0; |
4806 | } | |
5262f567 | 4807 | |
62755e35 JA |
4808 | static bool io_cancel_cb(struct io_wq_work *work, void *data) |
4809 | { | |
4810 | struct io_kiocb *req = container_of(work, struct io_kiocb, work); | |
4811 | ||
4812 | return req->user_data == (unsigned long) data; | |
4813 | } | |
4814 | ||
e977d6d3 | 4815 | static int io_async_cancel_one(struct io_ring_ctx *ctx, void *sqe_addr) |
62755e35 | 4816 | { |
62755e35 | 4817 | enum io_wq_cancel cancel_ret; |
62755e35 JA |
4818 | int ret = 0; |
4819 | ||
4f26bda1 | 4820 | cancel_ret = io_wq_cancel_cb(ctx->io_wq, io_cancel_cb, sqe_addr, false); |
62755e35 JA |
4821 | switch (cancel_ret) { |
4822 | case IO_WQ_CANCEL_OK: | |
4823 | ret = 0; | |
4824 | break; | |
4825 | case IO_WQ_CANCEL_RUNNING: | |
4826 | ret = -EALREADY; | |
4827 | break; | |
4828 | case IO_WQ_CANCEL_NOTFOUND: | |
4829 | ret = -ENOENT; | |
4830 | break; | |
4831 | } | |
4832 | ||
e977d6d3 JA |
4833 | return ret; |
4834 | } | |
4835 | ||
47f46768 JA |
4836 | static void io_async_find_and_cancel(struct io_ring_ctx *ctx, |
4837 | struct io_kiocb *req, __u64 sqe_addr, | |
014db007 | 4838 | int success_ret) |
47f46768 JA |
4839 | { |
4840 | unsigned long flags; | |
4841 | int ret; | |
4842 | ||
4843 | ret = io_async_cancel_one(ctx, (void *) (unsigned long) sqe_addr); | |
4844 | if (ret != -ENOENT) { | |
4845 | spin_lock_irqsave(&ctx->completion_lock, flags); | |
4846 | goto done; | |
4847 | } | |
4848 | ||
4849 | spin_lock_irqsave(&ctx->completion_lock, flags); | |
4850 | ret = io_timeout_cancel(ctx, sqe_addr); | |
4851 | if (ret != -ENOENT) | |
4852 | goto done; | |
4853 | ret = io_poll_cancel(ctx, sqe_addr); | |
4854 | done: | |
b0dd8a41 JA |
4855 | if (!ret) |
4856 | ret = success_ret; | |
47f46768 JA |
4857 | io_cqring_fill_event(req, ret); |
4858 | io_commit_cqring(ctx); | |
4859 | spin_unlock_irqrestore(&ctx->completion_lock, flags); | |
4860 | io_cqring_ev_posted(ctx); | |
4861 | ||
4e88d6e7 JA |
4862 | if (ret < 0) |
4863 | req_set_fail_links(req); | |
014db007 | 4864 | io_put_req(req); |
47f46768 JA |
4865 | } |
4866 | ||
3529d8c2 JA |
4867 | static int io_async_cancel_prep(struct io_kiocb *req, |
4868 | const struct io_uring_sqe *sqe) | |
e977d6d3 | 4869 | { |
fbf23849 | 4870 | if (unlikely(req->ctx->flags & IORING_SETUP_IOPOLL)) |
e977d6d3 JA |
4871 | return -EINVAL; |
4872 | if (sqe->flags || sqe->ioprio || sqe->off || sqe->len || | |
4873 | sqe->cancel_flags) | |
4874 | return -EINVAL; | |
4875 | ||
fbf23849 JA |
4876 | req->cancel.addr = READ_ONCE(sqe->addr); |
4877 | return 0; | |
4878 | } | |
4879 | ||
014db007 | 4880 | static int io_async_cancel(struct io_kiocb *req) |
fbf23849 JA |
4881 | { |
4882 | struct io_ring_ctx *ctx = req->ctx; | |
fbf23849 | 4883 | |
014db007 | 4884 | io_async_find_and_cancel(ctx, req, req->cancel.addr, 0); |
5262f567 JA |
4885 | return 0; |
4886 | } | |
4887 | ||
05f3fb3c JA |
4888 | static int io_files_update_prep(struct io_kiocb *req, |
4889 | const struct io_uring_sqe *sqe) | |
4890 | { | |
4891 | if (sqe->flags || sqe->ioprio || sqe->rw_flags) | |
4892 | return -EINVAL; | |
4893 | ||
4894 | req->files_update.offset = READ_ONCE(sqe->off); | |
4895 | req->files_update.nr_args = READ_ONCE(sqe->len); | |
4896 | if (!req->files_update.nr_args) | |
4897 | return -EINVAL; | |
4898 | req->files_update.arg = READ_ONCE(sqe->addr); | |
4899 | return 0; | |
4900 | } | |
4901 | ||
4902 | static int io_files_update(struct io_kiocb *req, bool force_nonblock) | |
fbf23849 JA |
4903 | { |
4904 | struct io_ring_ctx *ctx = req->ctx; | |
05f3fb3c JA |
4905 | struct io_uring_files_update up; |
4906 | int ret; | |
fbf23849 | 4907 | |
f86cd20c | 4908 | if (force_nonblock) |
05f3fb3c | 4909 | return -EAGAIN; |
05f3fb3c JA |
4910 | |
4911 | up.offset = req->files_update.offset; | |
4912 | up.fds = req->files_update.arg; | |
4913 | ||
4914 | mutex_lock(&ctx->uring_lock); | |
4915 | ret = __io_sqe_files_update(ctx, &up, req->files_update.nr_args); | |
4916 | mutex_unlock(&ctx->uring_lock); | |
4917 | ||
4918 | if (ret < 0) | |
4919 | req_set_fail_links(req); | |
4920 | io_cqring_add_event(req, ret); | |
4921 | io_put_req(req); | |
5262f567 JA |
4922 | return 0; |
4923 | } | |
4924 | ||
3529d8c2 JA |
4925 | static int io_req_defer_prep(struct io_kiocb *req, |
4926 | const struct io_uring_sqe *sqe) | |
f67676d1 | 4927 | { |
e781573e | 4928 | ssize_t ret = 0; |
f67676d1 | 4929 | |
f1d96a8f PB |
4930 | if (!sqe) |
4931 | return 0; | |
4932 | ||
7cdaf587 XW |
4933 | io_req_init_async(req); |
4934 | ||
f86cd20c JA |
4935 | if (io_op_defs[req->opcode].file_table) { |
4936 | ret = io_grab_files(req); | |
4937 | if (unlikely(ret)) | |
4938 | return ret; | |
4939 | } | |
4940 | ||
cccf0ee8 JA |
4941 | io_req_work_grab_env(req, &io_op_defs[req->opcode]); |
4942 | ||
d625c6ee | 4943 | switch (req->opcode) { |
e781573e JA |
4944 | case IORING_OP_NOP: |
4945 | break; | |
f67676d1 JA |
4946 | case IORING_OP_READV: |
4947 | case IORING_OP_READ_FIXED: | |
3a6820f2 | 4948 | case IORING_OP_READ: |
3529d8c2 | 4949 | ret = io_read_prep(req, sqe, true); |
f67676d1 JA |
4950 | break; |
4951 | case IORING_OP_WRITEV: | |
4952 | case IORING_OP_WRITE_FIXED: | |
3a6820f2 | 4953 | case IORING_OP_WRITE: |
3529d8c2 | 4954 | ret = io_write_prep(req, sqe, true); |
f67676d1 | 4955 | break; |
0969e783 | 4956 | case IORING_OP_POLL_ADD: |
3529d8c2 | 4957 | ret = io_poll_add_prep(req, sqe); |
0969e783 JA |
4958 | break; |
4959 | case IORING_OP_POLL_REMOVE: | |
3529d8c2 | 4960 | ret = io_poll_remove_prep(req, sqe); |
0969e783 | 4961 | break; |
8ed8d3c3 | 4962 | case IORING_OP_FSYNC: |
3529d8c2 | 4963 | ret = io_prep_fsync(req, sqe); |
8ed8d3c3 JA |
4964 | break; |
4965 | case IORING_OP_SYNC_FILE_RANGE: | |
3529d8c2 | 4966 | ret = io_prep_sfr(req, sqe); |
8ed8d3c3 | 4967 | break; |
03b1230c | 4968 | case IORING_OP_SENDMSG: |
fddaface | 4969 | case IORING_OP_SEND: |
3529d8c2 | 4970 | ret = io_sendmsg_prep(req, sqe); |
03b1230c JA |
4971 | break; |
4972 | case IORING_OP_RECVMSG: | |
fddaface | 4973 | case IORING_OP_RECV: |
3529d8c2 | 4974 | ret = io_recvmsg_prep(req, sqe); |
03b1230c | 4975 | break; |
f499a021 | 4976 | case IORING_OP_CONNECT: |
3529d8c2 | 4977 | ret = io_connect_prep(req, sqe); |
f499a021 | 4978 | break; |
2d28390a | 4979 | case IORING_OP_TIMEOUT: |
3529d8c2 | 4980 | ret = io_timeout_prep(req, sqe, false); |
b7bb4f7d | 4981 | break; |
b29472ee | 4982 | case IORING_OP_TIMEOUT_REMOVE: |
3529d8c2 | 4983 | ret = io_timeout_remove_prep(req, sqe); |
b29472ee | 4984 | break; |
fbf23849 | 4985 | case IORING_OP_ASYNC_CANCEL: |
3529d8c2 | 4986 | ret = io_async_cancel_prep(req, sqe); |
fbf23849 | 4987 | break; |
2d28390a | 4988 | case IORING_OP_LINK_TIMEOUT: |
3529d8c2 | 4989 | ret = io_timeout_prep(req, sqe, true); |
b7bb4f7d | 4990 | break; |
8ed8d3c3 | 4991 | case IORING_OP_ACCEPT: |
3529d8c2 | 4992 | ret = io_accept_prep(req, sqe); |
8ed8d3c3 | 4993 | break; |
d63d1b5e JA |
4994 | case IORING_OP_FALLOCATE: |
4995 | ret = io_fallocate_prep(req, sqe); | |
4996 | break; | |
15b71abe JA |
4997 | case IORING_OP_OPENAT: |
4998 | ret = io_openat_prep(req, sqe); | |
4999 | break; | |
b5dba59e JA |
5000 | case IORING_OP_CLOSE: |
5001 | ret = io_close_prep(req, sqe); | |
5002 | break; | |
05f3fb3c JA |
5003 | case IORING_OP_FILES_UPDATE: |
5004 | ret = io_files_update_prep(req, sqe); | |
5005 | break; | |
eddc7ef5 JA |
5006 | case IORING_OP_STATX: |
5007 | ret = io_statx_prep(req, sqe); | |
5008 | break; | |
4840e418 JA |
5009 | case IORING_OP_FADVISE: |
5010 | ret = io_fadvise_prep(req, sqe); | |
5011 | break; | |
c1ca757b JA |
5012 | case IORING_OP_MADVISE: |
5013 | ret = io_madvise_prep(req, sqe); | |
5014 | break; | |
cebdb986 JA |
5015 | case IORING_OP_OPENAT2: |
5016 | ret = io_openat2_prep(req, sqe); | |
5017 | break; | |
3e4827b0 JA |
5018 | case IORING_OP_EPOLL_CTL: |
5019 | ret = io_epoll_ctl_prep(req, sqe); | |
5020 | break; | |
7d67af2c PB |
5021 | case IORING_OP_SPLICE: |
5022 | ret = io_splice_prep(req, sqe); | |
5023 | break; | |
ddf0322d JA |
5024 | case IORING_OP_PROVIDE_BUFFERS: |
5025 | ret = io_provide_buffers_prep(req, sqe); | |
5026 | break; | |
067524e9 JA |
5027 | case IORING_OP_REMOVE_BUFFERS: |
5028 | ret = io_remove_buffers_prep(req, sqe); | |
5029 | break; | |
f2a8d5c7 PB |
5030 | case IORING_OP_TEE: |
5031 | ret = io_tee_prep(req, sqe); | |
5032 | break; | |
f67676d1 | 5033 | default: |
e781573e JA |
5034 | printk_once(KERN_WARNING "io_uring: unhandled opcode %d\n", |
5035 | req->opcode); | |
5036 | ret = -EINVAL; | |
b7bb4f7d | 5037 | break; |
f67676d1 JA |
5038 | } |
5039 | ||
b7bb4f7d | 5040 | return ret; |
f67676d1 JA |
5041 | } |
5042 | ||
3529d8c2 | 5043 | static int io_req_defer(struct io_kiocb *req, const struct io_uring_sqe *sqe) |
de0617e4 | 5044 | { |
a197f664 | 5045 | struct io_ring_ctx *ctx = req->ctx; |
f67676d1 | 5046 | int ret; |
de0617e4 | 5047 | |
9d858b21 | 5048 | /* Still need defer if there is pending req in defer list. */ |
4ee36314 | 5049 | if (!req_need_defer(req) && list_empty_careful(&ctx->defer_list)) |
de0617e4 JA |
5050 | return 0; |
5051 | ||
650b5481 PB |
5052 | if (!req->io) { |
5053 | if (io_alloc_async_ctx(req)) | |
5054 | return -EAGAIN; | |
5055 | ret = io_req_defer_prep(req, sqe); | |
5056 | if (ret < 0) | |
5057 | return ret; | |
5058 | } | |
2d28390a | 5059 | |
de0617e4 | 5060 | spin_lock_irq(&ctx->completion_lock); |
9d858b21 | 5061 | if (!req_need_defer(req) && list_empty(&ctx->defer_list)) { |
de0617e4 | 5062 | spin_unlock_irq(&ctx->completion_lock); |
de0617e4 JA |
5063 | return 0; |
5064 | } | |
5065 | ||
915967f6 | 5066 | trace_io_uring_defer(ctx, req, req->user_data); |
de0617e4 JA |
5067 | list_add_tail(&req->list, &ctx->defer_list); |
5068 | spin_unlock_irq(&ctx->completion_lock); | |
5069 | return -EIOCBQUEUED; | |
5070 | } | |
5071 | ||
99bc4c38 PB |
5072 | static void io_cleanup_req(struct io_kiocb *req) |
5073 | { | |
5074 | struct io_async_ctx *io = req->io; | |
5075 | ||
5076 | switch (req->opcode) { | |
5077 | case IORING_OP_READV: | |
5078 | case IORING_OP_READ_FIXED: | |
5079 | case IORING_OP_READ: | |
bcda7baa JA |
5080 | if (req->flags & REQ_F_BUFFER_SELECTED) |
5081 | kfree((void *)(unsigned long)req->rw.addr); | |
5082 | /* fallthrough */ | |
99bc4c38 PB |
5083 | case IORING_OP_WRITEV: |
5084 | case IORING_OP_WRITE_FIXED: | |
5085 | case IORING_OP_WRITE: | |
5086 | if (io->rw.iov != io->rw.fast_iov) | |
5087 | kfree(io->rw.iov); | |
5088 | break; | |
99bc4c38 | 5089 | case IORING_OP_RECVMSG: |
52de1fe1 JA |
5090 | if (req->flags & REQ_F_BUFFER_SELECTED) |
5091 | kfree(req->sr_msg.kbuf); | |
5092 | /* fallthrough */ | |
5093 | case IORING_OP_SENDMSG: | |
99bc4c38 PB |
5094 | if (io->msg.iov != io->msg.fast_iov) |
5095 | kfree(io->msg.iov); | |
5096 | break; | |
bcda7baa JA |
5097 | case IORING_OP_RECV: |
5098 | if (req->flags & REQ_F_BUFFER_SELECTED) | |
5099 | kfree(req->sr_msg.kbuf); | |
5100 | break; | |
8fef80bf PB |
5101 | case IORING_OP_OPENAT: |
5102 | case IORING_OP_OPENAT2: | |
8fef80bf | 5103 | break; |
7d67af2c | 5104 | case IORING_OP_SPLICE: |
f2a8d5c7 | 5105 | case IORING_OP_TEE: |
7d67af2c PB |
5106 | io_put_file(req, req->splice.file_in, |
5107 | (req->splice.flags & SPLICE_F_FD_IN_FIXED)); | |
5108 | break; | |
99bc4c38 PB |
5109 | } |
5110 | ||
5111 | req->flags &= ~REQ_F_NEED_CLEANUP; | |
5112 | } | |
5113 | ||
3529d8c2 | 5114 | static int io_issue_sqe(struct io_kiocb *req, const struct io_uring_sqe *sqe, |
014db007 | 5115 | bool force_nonblock) |
2b188cc1 | 5116 | { |
a197f664 | 5117 | struct io_ring_ctx *ctx = req->ctx; |
d625c6ee | 5118 | int ret; |
2b188cc1 | 5119 | |
d625c6ee | 5120 | switch (req->opcode) { |
2b188cc1 | 5121 | case IORING_OP_NOP: |
78e19bbe | 5122 | ret = io_nop(req); |
2b188cc1 JA |
5123 | break; |
5124 | case IORING_OP_READV: | |
edafccee | 5125 | case IORING_OP_READ_FIXED: |
3a6820f2 | 5126 | case IORING_OP_READ: |
3529d8c2 JA |
5127 | if (sqe) { |
5128 | ret = io_read_prep(req, sqe, force_nonblock); | |
5129 | if (ret < 0) | |
5130 | break; | |
5131 | } | |
014db007 | 5132 | ret = io_read(req, force_nonblock); |
edafccee | 5133 | break; |
3529d8c2 | 5134 | case IORING_OP_WRITEV: |
edafccee | 5135 | case IORING_OP_WRITE_FIXED: |
3a6820f2 | 5136 | case IORING_OP_WRITE: |
3529d8c2 JA |
5137 | if (sqe) { |
5138 | ret = io_write_prep(req, sqe, force_nonblock); | |
5139 | if (ret < 0) | |
5140 | break; | |
5141 | } | |
014db007 | 5142 | ret = io_write(req, force_nonblock); |
2b188cc1 | 5143 | break; |
c992fe29 | 5144 | case IORING_OP_FSYNC: |
3529d8c2 JA |
5145 | if (sqe) { |
5146 | ret = io_prep_fsync(req, sqe); | |
5147 | if (ret < 0) | |
5148 | break; | |
5149 | } | |
014db007 | 5150 | ret = io_fsync(req, force_nonblock); |
c992fe29 | 5151 | break; |
221c5eb2 | 5152 | case IORING_OP_POLL_ADD: |
3529d8c2 JA |
5153 | if (sqe) { |
5154 | ret = io_poll_add_prep(req, sqe); | |
5155 | if (ret) | |
5156 | break; | |
5157 | } | |
014db007 | 5158 | ret = io_poll_add(req); |
221c5eb2 JA |
5159 | break; |
5160 | case IORING_OP_POLL_REMOVE: | |
3529d8c2 JA |
5161 | if (sqe) { |
5162 | ret = io_poll_remove_prep(req, sqe); | |
5163 | if (ret < 0) | |
5164 | break; | |
5165 | } | |
fc4df999 | 5166 | ret = io_poll_remove(req); |
221c5eb2 | 5167 | break; |
5d17b4a4 | 5168 | case IORING_OP_SYNC_FILE_RANGE: |
3529d8c2 JA |
5169 | if (sqe) { |
5170 | ret = io_prep_sfr(req, sqe); | |
5171 | if (ret < 0) | |
5172 | break; | |
5173 | } | |
014db007 | 5174 | ret = io_sync_file_range(req, force_nonblock); |
5d17b4a4 | 5175 | break; |
0fa03c62 | 5176 | case IORING_OP_SENDMSG: |
fddaface | 5177 | case IORING_OP_SEND: |
3529d8c2 JA |
5178 | if (sqe) { |
5179 | ret = io_sendmsg_prep(req, sqe); | |
5180 | if (ret < 0) | |
5181 | break; | |
5182 | } | |
fddaface | 5183 | if (req->opcode == IORING_OP_SENDMSG) |
014db007 | 5184 | ret = io_sendmsg(req, force_nonblock); |
fddaface | 5185 | else |
014db007 | 5186 | ret = io_send(req, force_nonblock); |
0fa03c62 | 5187 | break; |
aa1fa28f | 5188 | case IORING_OP_RECVMSG: |
fddaface | 5189 | case IORING_OP_RECV: |
3529d8c2 JA |
5190 | if (sqe) { |
5191 | ret = io_recvmsg_prep(req, sqe); | |
5192 | if (ret) | |
5193 | break; | |
5194 | } | |
fddaface | 5195 | if (req->opcode == IORING_OP_RECVMSG) |
014db007 | 5196 | ret = io_recvmsg(req, force_nonblock); |
fddaface | 5197 | else |
014db007 | 5198 | ret = io_recv(req, force_nonblock); |
aa1fa28f | 5199 | break; |
5262f567 | 5200 | case IORING_OP_TIMEOUT: |
3529d8c2 JA |
5201 | if (sqe) { |
5202 | ret = io_timeout_prep(req, sqe, false); | |
5203 | if (ret) | |
5204 | break; | |
5205 | } | |
fc4df999 | 5206 | ret = io_timeout(req); |
5262f567 | 5207 | break; |
11365043 | 5208 | case IORING_OP_TIMEOUT_REMOVE: |
3529d8c2 JA |
5209 | if (sqe) { |
5210 | ret = io_timeout_remove_prep(req, sqe); | |
5211 | if (ret) | |
5212 | break; | |
5213 | } | |
fc4df999 | 5214 | ret = io_timeout_remove(req); |
11365043 | 5215 | break; |
17f2fe35 | 5216 | case IORING_OP_ACCEPT: |
3529d8c2 JA |
5217 | if (sqe) { |
5218 | ret = io_accept_prep(req, sqe); | |
5219 | if (ret) | |
5220 | break; | |
5221 | } | |
014db007 | 5222 | ret = io_accept(req, force_nonblock); |
17f2fe35 | 5223 | break; |
f8e85cf2 | 5224 | case IORING_OP_CONNECT: |
3529d8c2 JA |
5225 | if (sqe) { |
5226 | ret = io_connect_prep(req, sqe); | |
5227 | if (ret) | |
5228 | break; | |
5229 | } | |
014db007 | 5230 | ret = io_connect(req, force_nonblock); |
f8e85cf2 | 5231 | break; |
62755e35 | 5232 | case IORING_OP_ASYNC_CANCEL: |
3529d8c2 JA |
5233 | if (sqe) { |
5234 | ret = io_async_cancel_prep(req, sqe); | |
5235 | if (ret) | |
5236 | break; | |
5237 | } | |
014db007 | 5238 | ret = io_async_cancel(req); |
62755e35 | 5239 | break; |
d63d1b5e JA |
5240 | case IORING_OP_FALLOCATE: |
5241 | if (sqe) { | |
5242 | ret = io_fallocate_prep(req, sqe); | |
5243 | if (ret) | |
5244 | break; | |
5245 | } | |
014db007 | 5246 | ret = io_fallocate(req, force_nonblock); |
d63d1b5e | 5247 | break; |
15b71abe JA |
5248 | case IORING_OP_OPENAT: |
5249 | if (sqe) { | |
5250 | ret = io_openat_prep(req, sqe); | |
5251 | if (ret) | |
5252 | break; | |
5253 | } | |
014db007 | 5254 | ret = io_openat(req, force_nonblock); |
15b71abe | 5255 | break; |
b5dba59e JA |
5256 | case IORING_OP_CLOSE: |
5257 | if (sqe) { | |
5258 | ret = io_close_prep(req, sqe); | |
5259 | if (ret) | |
5260 | break; | |
5261 | } | |
014db007 | 5262 | ret = io_close(req, force_nonblock); |
b5dba59e | 5263 | break; |
05f3fb3c JA |
5264 | case IORING_OP_FILES_UPDATE: |
5265 | if (sqe) { | |
5266 | ret = io_files_update_prep(req, sqe); | |
5267 | if (ret) | |
5268 | break; | |
5269 | } | |
5270 | ret = io_files_update(req, force_nonblock); | |
5271 | break; | |
eddc7ef5 JA |
5272 | case IORING_OP_STATX: |
5273 | if (sqe) { | |
5274 | ret = io_statx_prep(req, sqe); | |
5275 | if (ret) | |
5276 | break; | |
5277 | } | |
014db007 | 5278 | ret = io_statx(req, force_nonblock); |
eddc7ef5 | 5279 | break; |
4840e418 JA |
5280 | case IORING_OP_FADVISE: |
5281 | if (sqe) { | |
5282 | ret = io_fadvise_prep(req, sqe); | |
5283 | if (ret) | |
5284 | break; | |
5285 | } | |
014db007 | 5286 | ret = io_fadvise(req, force_nonblock); |
4840e418 | 5287 | break; |
c1ca757b JA |
5288 | case IORING_OP_MADVISE: |
5289 | if (sqe) { | |
5290 | ret = io_madvise_prep(req, sqe); | |
5291 | if (ret) | |
5292 | break; | |
5293 | } | |
014db007 | 5294 | ret = io_madvise(req, force_nonblock); |
c1ca757b | 5295 | break; |
cebdb986 JA |
5296 | case IORING_OP_OPENAT2: |
5297 | if (sqe) { | |
5298 | ret = io_openat2_prep(req, sqe); | |
5299 | if (ret) | |
5300 | break; | |
5301 | } | |
014db007 | 5302 | ret = io_openat2(req, force_nonblock); |
cebdb986 | 5303 | break; |
3e4827b0 JA |
5304 | case IORING_OP_EPOLL_CTL: |
5305 | if (sqe) { | |
5306 | ret = io_epoll_ctl_prep(req, sqe); | |
5307 | if (ret) | |
5308 | break; | |
5309 | } | |
014db007 | 5310 | ret = io_epoll_ctl(req, force_nonblock); |
3e4827b0 | 5311 | break; |
7d67af2c PB |
5312 | case IORING_OP_SPLICE: |
5313 | if (sqe) { | |
5314 | ret = io_splice_prep(req, sqe); | |
5315 | if (ret < 0) | |
5316 | break; | |
5317 | } | |
014db007 | 5318 | ret = io_splice(req, force_nonblock); |
7d67af2c | 5319 | break; |
ddf0322d JA |
5320 | case IORING_OP_PROVIDE_BUFFERS: |
5321 | if (sqe) { | |
5322 | ret = io_provide_buffers_prep(req, sqe); | |
5323 | if (ret) | |
5324 | break; | |
5325 | } | |
5326 | ret = io_provide_buffers(req, force_nonblock); | |
5327 | break; | |
067524e9 JA |
5328 | case IORING_OP_REMOVE_BUFFERS: |
5329 | if (sqe) { | |
5330 | ret = io_remove_buffers_prep(req, sqe); | |
5331 | if (ret) | |
5332 | break; | |
5333 | } | |
5334 | ret = io_remove_buffers(req, force_nonblock); | |
3e4827b0 | 5335 | break; |
f2a8d5c7 PB |
5336 | case IORING_OP_TEE: |
5337 | if (sqe) { | |
5338 | ret = io_tee_prep(req, sqe); | |
5339 | if (ret < 0) | |
5340 | break; | |
5341 | } | |
5342 | ret = io_tee(req, force_nonblock); | |
5343 | break; | |
2b188cc1 JA |
5344 | default: |
5345 | ret = -EINVAL; | |
5346 | break; | |
5347 | } | |
5348 | ||
def596e9 JA |
5349 | if (ret) |
5350 | return ret; | |
5351 | ||
b532576e JA |
5352 | /* If the op doesn't have a file, we're not polling for it */ |
5353 | if ((ctx->flags & IORING_SETUP_IOPOLL) && req->file) { | |
11ba820b JA |
5354 | const bool in_async = io_wq_current_is_worker(); |
5355 | ||
9e645e11 | 5356 | if (req->result == -EAGAIN) |
def596e9 JA |
5357 | return -EAGAIN; |
5358 | ||
11ba820b JA |
5359 | /* workqueue context doesn't hold uring_lock, grab it now */ |
5360 | if (in_async) | |
5361 | mutex_lock(&ctx->uring_lock); | |
5362 | ||
def596e9 | 5363 | io_iopoll_req_issued(req); |
11ba820b JA |
5364 | |
5365 | if (in_async) | |
5366 | mutex_unlock(&ctx->uring_lock); | |
def596e9 JA |
5367 | } |
5368 | ||
5369 | return 0; | |
2b188cc1 JA |
5370 | } |
5371 | ||
d4c81f38 PB |
5372 | static void io_arm_async_linked_timeout(struct io_kiocb *req) |
5373 | { | |
5374 | struct io_kiocb *link; | |
5375 | ||
5376 | /* link head's timeout is queued in io_queue_async_work() */ | |
5377 | if (!(req->flags & REQ_F_QUEUE_TIMEOUT)) | |
5378 | return; | |
5379 | ||
5380 | link = list_first_entry(&req->link_list, struct io_kiocb, link_list); | |
5381 | io_queue_linked_timeout(link); | |
5382 | } | |
5383 | ||
561fb04a | 5384 | static void io_wq_submit_work(struct io_wq_work **workptr) |
2b188cc1 | 5385 | { |
561fb04a | 5386 | struct io_wq_work *work = *workptr; |
2b188cc1 | 5387 | struct io_kiocb *req = container_of(work, struct io_kiocb, work); |
561fb04a | 5388 | int ret = 0; |
2b188cc1 | 5389 | |
d4c81f38 PB |
5390 | io_arm_async_linked_timeout(req); |
5391 | ||
0c9d5ccd JA |
5392 | /* if NO_CANCEL is set, we must still run the work */ |
5393 | if ((work->flags & (IO_WQ_WORK_CANCEL|IO_WQ_WORK_NO_CANCEL)) == | |
5394 | IO_WQ_WORK_CANCEL) { | |
561fb04a | 5395 | ret = -ECANCELED; |
0c9d5ccd | 5396 | } |
31b51510 | 5397 | |
561fb04a | 5398 | if (!ret) { |
561fb04a | 5399 | do { |
014db007 | 5400 | ret = io_issue_sqe(req, NULL, false); |
561fb04a JA |
5401 | /* |
5402 | * We can get EAGAIN for polled IO even though we're | |
5403 | * forcing a sync submission from here, since we can't | |
5404 | * wait for request slots on the block side. | |
5405 | */ | |
5406 | if (ret != -EAGAIN) | |
5407 | break; | |
5408 | cond_resched(); | |
5409 | } while (1); | |
5410 | } | |
31b51510 | 5411 | |
561fb04a | 5412 | if (ret) { |
4e88d6e7 | 5413 | req_set_fail_links(req); |
78e19bbe | 5414 | io_cqring_add_event(req, ret); |
817869d2 | 5415 | io_put_req(req); |
edafccee | 5416 | } |
2b188cc1 | 5417 | |
e9fd9396 | 5418 | io_steal_work(req, workptr); |
2b188cc1 JA |
5419 | } |
5420 | ||
65e19f54 JA |
5421 | static inline struct file *io_file_from_index(struct io_ring_ctx *ctx, |
5422 | int index) | |
5423 | { | |
5424 | struct fixed_file_table *table; | |
5425 | ||
05f3fb3c | 5426 | table = &ctx->file_data->table[index >> IORING_FILE_TABLE_SHIFT]; |
84695089 | 5427 | return table->files[index & IORING_FILE_TABLE_MASK]; |
65e19f54 JA |
5428 | } |
5429 | ||
8da11c19 PB |
5430 | static int io_file_get(struct io_submit_state *state, struct io_kiocb *req, |
5431 | int fd, struct file **out_file, bool fixed) | |
09bb8394 | 5432 | { |
a197f664 | 5433 | struct io_ring_ctx *ctx = req->ctx; |
8da11c19 | 5434 | struct file *file; |
09bb8394 | 5435 | |
8da11c19 | 5436 | if (fixed) { |
05f3fb3c | 5437 | if (unlikely(!ctx->file_data || |
09bb8394 JA |
5438 | (unsigned) fd >= ctx->nr_user_files)) |
5439 | return -EBADF; | |
b7620121 | 5440 | fd = array_index_nospec(fd, ctx->nr_user_files); |
8da11c19 | 5441 | file = io_file_from_index(ctx, fd); |
fd2206e4 JA |
5442 | if (file) { |
5443 | req->fixed_file_refs = ctx->file_data->cur_refs; | |
5444 | percpu_ref_get(req->fixed_file_refs); | |
5445 | } | |
09bb8394 | 5446 | } else { |
c826bd7a | 5447 | trace_io_uring_file_get(ctx, fd); |
8da11c19 | 5448 | file = __io_file_get(state, fd); |
09bb8394 JA |
5449 | } |
5450 | ||
fd2206e4 JA |
5451 | if (file || io_op_defs[req->opcode].needs_file_no_error) { |
5452 | *out_file = file; | |
5453 | return 0; | |
5454 | } | |
5455 | return -EBADF; | |
09bb8394 JA |
5456 | } |
5457 | ||
8da11c19 | 5458 | static int io_req_set_file(struct io_submit_state *state, struct io_kiocb *req, |
63ff8223 | 5459 | int fd) |
8da11c19 | 5460 | { |
8da11c19 PB |
5461 | bool fixed; |
5462 | ||
63ff8223 | 5463 | fixed = (req->flags & REQ_F_FIXED_FILE) != 0; |
0cdaf760 | 5464 | if (unlikely(!fixed && io_async_submit(req->ctx))) |
8da11c19 PB |
5465 | return -EBADF; |
5466 | ||
5467 | return io_file_get(state, req, fd, &req->file, fixed); | |
5468 | } | |
5469 | ||
a197f664 | 5470 | static int io_grab_files(struct io_kiocb *req) |
fcb323cc JA |
5471 | { |
5472 | int ret = -EBADF; | |
a197f664 | 5473 | struct io_ring_ctx *ctx = req->ctx; |
fcb323cc | 5474 | |
5b0bbee4 | 5475 | if (req->work.files || (req->flags & REQ_F_NO_FILE_TABLE)) |
f86cd20c | 5476 | return 0; |
b14cca0c | 5477 | if (!ctx->ring_file) |
b5dba59e JA |
5478 | return -EBADF; |
5479 | ||
fcb323cc JA |
5480 | rcu_read_lock(); |
5481 | spin_lock_irq(&ctx->inflight_lock); | |
5482 | /* | |
5483 | * We use the f_ops->flush() handler to ensure that we can flush | |
5484 | * out work accessing these files if the fd is closed. Check if | |
5485 | * the fd has changed since we started down this path, and disallow | |
5486 | * this operation if it has. | |
5487 | */ | |
b14cca0c | 5488 | if (fcheck(ctx->ring_fd) == ctx->ring_file) { |
fcb323cc JA |
5489 | list_add(&req->inflight_entry, &ctx->inflight_list); |
5490 | req->flags |= REQ_F_INFLIGHT; | |
5491 | req->work.files = current->files; | |
5492 | ret = 0; | |
5493 | } | |
5494 | spin_unlock_irq(&ctx->inflight_lock); | |
5495 | rcu_read_unlock(); | |
5496 | ||
5497 | return ret; | |
5498 | } | |
5499 | ||
2665abfd | 5500 | static enum hrtimer_restart io_link_timeout_fn(struct hrtimer *timer) |
2b188cc1 | 5501 | { |
ad8a48ac JA |
5502 | struct io_timeout_data *data = container_of(timer, |
5503 | struct io_timeout_data, timer); | |
5504 | struct io_kiocb *req = data->req; | |
2665abfd JA |
5505 | struct io_ring_ctx *ctx = req->ctx; |
5506 | struct io_kiocb *prev = NULL; | |
5507 | unsigned long flags; | |
2665abfd JA |
5508 | |
5509 | spin_lock_irqsave(&ctx->completion_lock, flags); | |
5510 | ||
5511 | /* | |
5512 | * We don't expect the list to be empty, that will only happen if we | |
5513 | * race with the completion of the linked work. | |
5514 | */ | |
4493233e PB |
5515 | if (!list_empty(&req->link_list)) { |
5516 | prev = list_entry(req->link_list.prev, struct io_kiocb, | |
5517 | link_list); | |
5d960724 | 5518 | if (refcount_inc_not_zero(&prev->refs)) { |
4493233e | 5519 | list_del_init(&req->link_list); |
5d960724 JA |
5520 | prev->flags &= ~REQ_F_LINK_TIMEOUT; |
5521 | } else | |
76a46e06 | 5522 | prev = NULL; |
2665abfd JA |
5523 | } |
5524 | ||
5525 | spin_unlock_irqrestore(&ctx->completion_lock, flags); | |
5526 | ||
5527 | if (prev) { | |
4e88d6e7 | 5528 | req_set_fail_links(prev); |
014db007 | 5529 | io_async_find_and_cancel(ctx, req, prev->user_data, -ETIME); |
76a46e06 | 5530 | io_put_req(prev); |
47f46768 JA |
5531 | } else { |
5532 | io_cqring_add_event(req, -ETIME); | |
5533 | io_put_req(req); | |
2665abfd | 5534 | } |
2665abfd JA |
5535 | return HRTIMER_NORESTART; |
5536 | } | |
5537 | ||
ad8a48ac | 5538 | static void io_queue_linked_timeout(struct io_kiocb *req) |
2665abfd | 5539 | { |
76a46e06 | 5540 | struct io_ring_ctx *ctx = req->ctx; |
2665abfd | 5541 | |
76a46e06 JA |
5542 | /* |
5543 | * If the list is now empty, then our linked request finished before | |
5544 | * we got a chance to setup the timer | |
5545 | */ | |
5546 | spin_lock_irq(&ctx->completion_lock); | |
4493233e | 5547 | if (!list_empty(&req->link_list)) { |
2d28390a | 5548 | struct io_timeout_data *data = &req->io->timeout; |
94ae5e77 | 5549 | |
ad8a48ac JA |
5550 | data->timer.function = io_link_timeout_fn; |
5551 | hrtimer_start(&data->timer, timespec64_to_ktime(data->ts), | |
5552 | data->mode); | |
2665abfd | 5553 | } |
76a46e06 | 5554 | spin_unlock_irq(&ctx->completion_lock); |
2665abfd | 5555 | |
2665abfd | 5556 | /* drop submission reference */ |
76a46e06 JA |
5557 | io_put_req(req); |
5558 | } | |
2665abfd | 5559 | |
ad8a48ac | 5560 | static struct io_kiocb *io_prep_linked_timeout(struct io_kiocb *req) |
2665abfd JA |
5561 | { |
5562 | struct io_kiocb *nxt; | |
5563 | ||
dea3b49c | 5564 | if (!(req->flags & REQ_F_LINK_HEAD)) |
2665abfd | 5565 | return NULL; |
d7718a9d JA |
5566 | /* for polled retry, if flag is set, we already went through here */ |
5567 | if (req->flags & REQ_F_POLLED) | |
5568 | return NULL; | |
2665abfd | 5569 | |
4493233e PB |
5570 | nxt = list_first_entry_or_null(&req->link_list, struct io_kiocb, |
5571 | link_list); | |
d625c6ee | 5572 | if (!nxt || nxt->opcode != IORING_OP_LINK_TIMEOUT) |
76a46e06 | 5573 | return NULL; |
2665abfd | 5574 | |
76a46e06 | 5575 | req->flags |= REQ_F_LINK_TIMEOUT; |
76a46e06 | 5576 | return nxt; |
2665abfd JA |
5577 | } |
5578 | ||
3529d8c2 | 5579 | static void __io_queue_sqe(struct io_kiocb *req, const struct io_uring_sqe *sqe) |
2b188cc1 | 5580 | { |
4a0a7a18 | 5581 | struct io_kiocb *linked_timeout; |
4bc4494e | 5582 | struct io_kiocb *nxt; |
193155c8 | 5583 | const struct cred *old_creds = NULL; |
e0c5c576 | 5584 | int ret; |
2b188cc1 | 5585 | |
4a0a7a18 JA |
5586 | again: |
5587 | linked_timeout = io_prep_linked_timeout(req); | |
5588 | ||
7cdaf587 XW |
5589 | if ((req->flags & REQ_F_WORK_INITIALIZED) && req->work.creds && |
5590 | req->work.creds != current_cred()) { | |
193155c8 JA |
5591 | if (old_creds) |
5592 | revert_creds(old_creds); | |
5593 | if (old_creds == req->work.creds) | |
5594 | old_creds = NULL; /* restored original creds */ | |
5595 | else | |
5596 | old_creds = override_creds(req->work.creds); | |
5597 | } | |
5598 | ||
014db007 | 5599 | ret = io_issue_sqe(req, sqe, true); |
491381ce JA |
5600 | |
5601 | /* | |
5602 | * We async punt it if the file wasn't marked NOWAIT, or if the file | |
5603 | * doesn't support non-blocking read/write attempts | |
5604 | */ | |
5605 | if (ret == -EAGAIN && (!(req->flags & REQ_F_NOWAIT) || | |
5606 | (req->flags & REQ_F_MUST_PUNT))) { | |
d7718a9d JA |
5607 | if (io_arm_poll_handler(req)) { |
5608 | if (linked_timeout) | |
5609 | io_queue_linked_timeout(linked_timeout); | |
4bc4494e | 5610 | goto exit; |
d7718a9d | 5611 | } |
86a761f8 | 5612 | punt: |
7cdaf587 XW |
5613 | io_req_init_async(req); |
5614 | ||
f86cd20c | 5615 | if (io_op_defs[req->opcode].file_table) { |
bbad27b2 PB |
5616 | ret = io_grab_files(req); |
5617 | if (ret) | |
5618 | goto err; | |
2b188cc1 | 5619 | } |
bbad27b2 PB |
5620 | |
5621 | /* | |
5622 | * Queued up for async execution, worker will release | |
5623 | * submit reference when the iocb is actually submitted. | |
5624 | */ | |
5625 | io_queue_async_work(req); | |
4bc4494e | 5626 | goto exit; |
2b188cc1 | 5627 | } |
e65ef56d | 5628 | |
fcb323cc | 5629 | err: |
4bc4494e | 5630 | nxt = NULL; |
76a46e06 | 5631 | /* drop submission reference */ |
2a44f467 | 5632 | io_put_req_find_next(req, &nxt); |
e65ef56d | 5633 | |
f9bd67f6 | 5634 | if (linked_timeout) { |
76a46e06 | 5635 | if (!ret) |
f9bd67f6 | 5636 | io_queue_linked_timeout(linked_timeout); |
76a46e06 | 5637 | else |
f9bd67f6 | 5638 | io_put_req(linked_timeout); |
76a46e06 JA |
5639 | } |
5640 | ||
e65ef56d | 5641 | /* and drop final reference, if we failed */ |
9e645e11 | 5642 | if (ret) { |
78e19bbe | 5643 | io_cqring_add_event(req, ret); |
4e88d6e7 | 5644 | req_set_fail_links(req); |
e65ef56d | 5645 | io_put_req(req); |
9e645e11 | 5646 | } |
4a0a7a18 JA |
5647 | if (nxt) { |
5648 | req = nxt; | |
86a761f8 PB |
5649 | |
5650 | if (req->flags & REQ_F_FORCE_ASYNC) | |
5651 | goto punt; | |
4a0a7a18 JA |
5652 | goto again; |
5653 | } | |
4bc4494e | 5654 | exit: |
193155c8 JA |
5655 | if (old_creds) |
5656 | revert_creds(old_creds); | |
2b188cc1 JA |
5657 | } |
5658 | ||
3529d8c2 | 5659 | static void io_queue_sqe(struct io_kiocb *req, const struct io_uring_sqe *sqe) |
4fe2c963 JL |
5660 | { |
5661 | int ret; | |
5662 | ||
3529d8c2 | 5663 | ret = io_req_defer(req, sqe); |
4fe2c963 JL |
5664 | if (ret) { |
5665 | if (ret != -EIOCBQUEUED) { | |
1118591a | 5666 | fail_req: |
78e19bbe | 5667 | io_cqring_add_event(req, ret); |
4e88d6e7 | 5668 | req_set_fail_links(req); |
78e19bbe | 5669 | io_double_put_req(req); |
4fe2c963 | 5670 | } |
2550878f | 5671 | } else if (req->flags & REQ_F_FORCE_ASYNC) { |
bd2ab18a PB |
5672 | if (!req->io) { |
5673 | ret = -EAGAIN; | |
5674 | if (io_alloc_async_ctx(req)) | |
5675 | goto fail_req; | |
5676 | ret = io_req_defer_prep(req, sqe); | |
5677 | if (unlikely(ret < 0)) | |
5678 | goto fail_req; | |
5679 | } | |
5680 | ||
ce35a47a JA |
5681 | /* |
5682 | * Never try inline submit of IOSQE_ASYNC is set, go straight | |
5683 | * to async execution. | |
5684 | */ | |
5685 | req->work.flags |= IO_WQ_WORK_CONCURRENT; | |
5686 | io_queue_async_work(req); | |
5687 | } else { | |
3529d8c2 | 5688 | __io_queue_sqe(req, sqe); |
ce35a47a | 5689 | } |
4fe2c963 JL |
5690 | } |
5691 | ||
1b4a51b6 | 5692 | static inline void io_queue_link_head(struct io_kiocb *req) |
4fe2c963 | 5693 | { |
94ae5e77 | 5694 | if (unlikely(req->flags & REQ_F_FAIL_LINK)) { |
1b4a51b6 PB |
5695 | io_cqring_add_event(req, -ECANCELED); |
5696 | io_double_put_req(req); | |
5697 | } else | |
3529d8c2 | 5698 | io_queue_sqe(req, NULL); |
4fe2c963 JL |
5699 | } |
5700 | ||
1d4240cc | 5701 | static int io_submit_sqe(struct io_kiocb *req, const struct io_uring_sqe *sqe, |
7d01bd74 | 5702 | struct io_kiocb **link) |
9e645e11 | 5703 | { |
a197f664 | 5704 | struct io_ring_ctx *ctx = req->ctx; |
ef4ff581 | 5705 | int ret; |
9e645e11 | 5706 | |
9e645e11 JA |
5707 | /* |
5708 | * If we already have a head request, queue this one for async | |
5709 | * submittal once the head completes. If we don't have a head but | |
5710 | * IOSQE_IO_LINK is set in the sqe, start a new head. This one will be | |
5711 | * submitted sync once the chain is complete. If none of those | |
5712 | * conditions are true (normal request), then just queue it. | |
5713 | */ | |
5714 | if (*link) { | |
9d76377f | 5715 | struct io_kiocb *head = *link; |
4e88d6e7 | 5716 | |
8cdf2193 PB |
5717 | /* |
5718 | * Taking sequential execution of a link, draining both sides | |
5719 | * of the link also fullfils IOSQE_IO_DRAIN semantics for all | |
5720 | * requests in the link. So, it drains the head and the | |
5721 | * next after the link request. The last one is done via | |
5722 | * drain_next flag to persist the effect across calls. | |
5723 | */ | |
ef4ff581 | 5724 | if (req->flags & REQ_F_IO_DRAIN) { |
711be031 PB |
5725 | head->flags |= REQ_F_IO_DRAIN; |
5726 | ctx->drain_next = 1; | |
5727 | } | |
1d4240cc PB |
5728 | if (io_alloc_async_ctx(req)) |
5729 | return -EAGAIN; | |
9e645e11 | 5730 | |
3529d8c2 | 5731 | ret = io_req_defer_prep(req, sqe); |
2d28390a | 5732 | if (ret) { |
4e88d6e7 | 5733 | /* fail even hard links since we don't submit */ |
9d76377f | 5734 | head->flags |= REQ_F_FAIL_LINK; |
1d4240cc | 5735 | return ret; |
2d28390a | 5736 | } |
9d76377f PB |
5737 | trace_io_uring_link(ctx, req, head); |
5738 | list_add_tail(&req->link_list, &head->link_list); | |
32fe525b PB |
5739 | |
5740 | /* last request of a link, enqueue the link */ | |
ef4ff581 | 5741 | if (!(req->flags & (REQ_F_LINK | REQ_F_HARDLINK))) { |
32fe525b PB |
5742 | io_queue_link_head(head); |
5743 | *link = NULL; | |
5744 | } | |
9e645e11 | 5745 | } else { |
711be031 PB |
5746 | if (unlikely(ctx->drain_next)) { |
5747 | req->flags |= REQ_F_IO_DRAIN; | |
ef4ff581 | 5748 | ctx->drain_next = 0; |
711be031 | 5749 | } |
ef4ff581 | 5750 | if (req->flags & (REQ_F_LINK | REQ_F_HARDLINK)) { |
dea3b49c | 5751 | req->flags |= REQ_F_LINK_HEAD; |
711be031 | 5752 | INIT_LIST_HEAD(&req->link_list); |
f1d96a8f | 5753 | |
1d4240cc PB |
5754 | if (io_alloc_async_ctx(req)) |
5755 | return -EAGAIN; | |
5756 | ||
711be031 PB |
5757 | ret = io_req_defer_prep(req, sqe); |
5758 | if (ret) | |
5759 | req->flags |= REQ_F_FAIL_LINK; | |
5760 | *link = req; | |
5761 | } else { | |
5762 | io_queue_sqe(req, sqe); | |
5763 | } | |
9e645e11 | 5764 | } |
2e6e1fde | 5765 | |
1d4240cc | 5766 | return 0; |
9e645e11 JA |
5767 | } |
5768 | ||
9a56a232 JA |
5769 | /* |
5770 | * Batched submission is done, ensure local IO is flushed out. | |
5771 | */ | |
5772 | static void io_submit_state_end(struct io_submit_state *state) | |
5773 | { | |
5774 | blk_finish_plug(&state->plug); | |
9f13c35b | 5775 | io_state_file_put(state); |
2579f913 | 5776 | if (state->free_reqs) |
6c8a3134 | 5777 | kmem_cache_free_bulk(req_cachep, state->free_reqs, state->reqs); |
9a56a232 JA |
5778 | } |
5779 | ||
5780 | /* | |
5781 | * Start submission side cache. | |
5782 | */ | |
5783 | static void io_submit_state_start(struct io_submit_state *state, | |
22efde59 | 5784 | unsigned int max_ios) |
9a56a232 JA |
5785 | { |
5786 | blk_start_plug(&state->plug); | |
2579f913 | 5787 | state->free_reqs = 0; |
9a56a232 JA |
5788 | state->file = NULL; |
5789 | state->ios_left = max_ios; | |
5790 | } | |
5791 | ||
2b188cc1 JA |
5792 | static void io_commit_sqring(struct io_ring_ctx *ctx) |
5793 | { | |
75b28aff | 5794 | struct io_rings *rings = ctx->rings; |
2b188cc1 | 5795 | |
caf582c6 PB |
5796 | /* |
5797 | * Ensure any loads from the SQEs are done at this point, | |
5798 | * since once we write the new head, the application could | |
5799 | * write new data to them. | |
5800 | */ | |
5801 | smp_store_release(&rings->sq.head, ctx->cached_sq_head); | |
2b188cc1 JA |
5802 | } |
5803 | ||
2b188cc1 | 5804 | /* |
3529d8c2 | 5805 | * Fetch an sqe, if one is available. Note that sqe_ptr will point to memory |
2b188cc1 JA |
5806 | * that is mapped by userspace. This means that care needs to be taken to |
5807 | * ensure that reads are stable, as we cannot rely on userspace always | |
5808 | * being a good citizen. If members of the sqe are validated and then later | |
5809 | * used, it's important that those reads are done through READ_ONCE() to | |
5810 | * prevent a re-load down the line. | |
5811 | */ | |
709b302f | 5812 | static const struct io_uring_sqe *io_get_sqe(struct io_ring_ctx *ctx) |
2b188cc1 | 5813 | { |
75b28aff | 5814 | u32 *sq_array = ctx->sq_array; |
2b188cc1 JA |
5815 | unsigned head; |
5816 | ||
5817 | /* | |
5818 | * The cached sq head (or cq tail) serves two purposes: | |
5819 | * | |
5820 | * 1) allows us to batch the cost of updating the user visible | |
5821 | * head updates. | |
5822 | * 2) allows the kernel side to track the head on its own, even | |
5823 | * though the application is the one updating it. | |
5824 | */ | |
ee7d46d9 | 5825 | head = READ_ONCE(sq_array[ctx->cached_sq_head & ctx->sq_mask]); |
709b302f PB |
5826 | if (likely(head < ctx->sq_entries)) |
5827 | return &ctx->sq_sqes[head]; | |
2b188cc1 JA |
5828 | |
5829 | /* drop invalid entries */ | |
498ccd9e | 5830 | ctx->cached_sq_dropped++; |
ee7d46d9 | 5831 | WRITE_ONCE(ctx->rings->sq_dropped, ctx->cached_sq_dropped); |
709b302f PB |
5832 | return NULL; |
5833 | } | |
5834 | ||
5835 | static inline void io_consume_sqe(struct io_ring_ctx *ctx) | |
5836 | { | |
5837 | ctx->cached_sq_head++; | |
2b188cc1 JA |
5838 | } |
5839 | ||
ef4ff581 PB |
5840 | #define SQE_VALID_FLAGS (IOSQE_FIXED_FILE|IOSQE_IO_DRAIN|IOSQE_IO_LINK| \ |
5841 | IOSQE_IO_HARDLINK | IOSQE_ASYNC | \ | |
5842 | IOSQE_BUFFER_SELECT) | |
5843 | ||
5844 | static int io_init_req(struct io_ring_ctx *ctx, struct io_kiocb *req, | |
5845 | const struct io_uring_sqe *sqe, | |
0cdaf760 | 5846 | struct io_submit_state *state) |
0553b8bd | 5847 | { |
ef4ff581 | 5848 | unsigned int sqe_flags; |
63ff8223 | 5849 | int id; |
ef4ff581 | 5850 | |
0553b8bd PB |
5851 | /* |
5852 | * All io need record the previous position, if LINK vs DARIN, | |
5853 | * it can be used to mark the position of the first IO in the | |
5854 | * link list. | |
5855 | */ | |
31af27c7 | 5856 | req->sequence = ctx->cached_sq_head - ctx->cached_sq_dropped; |
0553b8bd PB |
5857 | req->opcode = READ_ONCE(sqe->opcode); |
5858 | req->user_data = READ_ONCE(sqe->user_data); | |
5859 | req->io = NULL; | |
5860 | req->file = NULL; | |
5861 | req->ctx = ctx; | |
5862 | req->flags = 0; | |
5863 | /* one is dropped after submission, the other at completion */ | |
5864 | refcount_set(&req->refs, 2); | |
4dd2824d | 5865 | req->task = current; |
0553b8bd | 5866 | req->result = 0; |
ef4ff581 PB |
5867 | |
5868 | if (unlikely(req->opcode >= IORING_OP_LAST)) | |
5869 | return -EINVAL; | |
5870 | ||
9d8426a0 JA |
5871 | if (unlikely(io_sq_thread_acquire_mm(ctx, req))) |
5872 | return -EFAULT; | |
ef4ff581 PB |
5873 | |
5874 | sqe_flags = READ_ONCE(sqe->flags); | |
5875 | /* enforce forwards compatibility on users */ | |
5876 | if (unlikely(sqe_flags & ~SQE_VALID_FLAGS)) | |
5877 | return -EINVAL; | |
5878 | ||
5879 | if ((sqe_flags & IOSQE_BUFFER_SELECT) && | |
5880 | !io_op_defs[req->opcode].buffer_select) | |
5881 | return -EOPNOTSUPP; | |
5882 | ||
5883 | id = READ_ONCE(sqe->personality); | |
5884 | if (id) { | |
7cdaf587 | 5885 | io_req_init_async(req); |
ef4ff581 PB |
5886 | req->work.creds = idr_find(&ctx->personality_idr, id); |
5887 | if (unlikely(!req->work.creds)) | |
5888 | return -EINVAL; | |
5889 | get_cred(req->work.creds); | |
5890 | } | |
5891 | ||
5892 | /* same numerical values with corresponding REQ_F_*, safe to copy */ | |
c11368a5 | 5893 | req->flags |= sqe_flags; |
ef4ff581 | 5894 | |
63ff8223 JA |
5895 | if (!io_op_defs[req->opcode].needs_file) |
5896 | return 0; | |
5897 | ||
5898 | return io_req_set_file(state, req, READ_ONCE(sqe->fd)); | |
0553b8bd PB |
5899 | } |
5900 | ||
fb5ccc98 | 5901 | static int io_submit_sqes(struct io_ring_ctx *ctx, unsigned int nr, |
0cdaf760 | 5902 | struct file *ring_file, int ring_fd) |
6c271ce2 JA |
5903 | { |
5904 | struct io_submit_state state, *statep = NULL; | |
9e645e11 | 5905 | struct io_kiocb *link = NULL; |
9e645e11 | 5906 | int i, submitted = 0; |
6c271ce2 | 5907 | |
c4a2ed72 | 5908 | /* if we have a backlog and couldn't flush it all, return BUSY */ |
ad3eb2c8 JA |
5909 | if (test_bit(0, &ctx->sq_check_overflow)) { |
5910 | if (!list_empty(&ctx->cq_overflow_list) && | |
5911 | !io_cqring_overflow_flush(ctx, false)) | |
5912 | return -EBUSY; | |
5913 | } | |
6c271ce2 | 5914 | |
ee7d46d9 PB |
5915 | /* make sure SQ entry isn't read before tail */ |
5916 | nr = min3(nr, ctx->sq_entries, io_sqring_entries(ctx)); | |
9ef4f124 | 5917 | |
2b85edfc PB |
5918 | if (!percpu_ref_tryget_many(&ctx->refs, nr)) |
5919 | return -EAGAIN; | |
6c271ce2 JA |
5920 | |
5921 | if (nr > IO_PLUG_THRESHOLD) { | |
22efde59 | 5922 | io_submit_state_start(&state, nr); |
6c271ce2 JA |
5923 | statep = &state; |
5924 | } | |
5925 | ||
b14cca0c PB |
5926 | ctx->ring_fd = ring_fd; |
5927 | ctx->ring_file = ring_file; | |
5928 | ||
6c271ce2 | 5929 | for (i = 0; i < nr; i++) { |
3529d8c2 | 5930 | const struct io_uring_sqe *sqe; |
196be95c | 5931 | struct io_kiocb *req; |
1cb1edb2 | 5932 | int err; |
fb5ccc98 | 5933 | |
b1e50e54 PB |
5934 | sqe = io_get_sqe(ctx); |
5935 | if (unlikely(!sqe)) { | |
5936 | io_consume_sqe(ctx); | |
5937 | break; | |
5938 | } | |
0553b8bd | 5939 | req = io_alloc_req(ctx, statep); |
196be95c PB |
5940 | if (unlikely(!req)) { |
5941 | if (!submitted) | |
5942 | submitted = -EAGAIN; | |
fb5ccc98 | 5943 | break; |
196be95c | 5944 | } |
fb5ccc98 | 5945 | |
0cdaf760 | 5946 | err = io_init_req(ctx, req, sqe, statep); |
709b302f | 5947 | io_consume_sqe(ctx); |
d3656344 JA |
5948 | /* will complete beyond this point, count as submitted */ |
5949 | submitted++; | |
5950 | ||
ef4ff581 | 5951 | if (unlikely(err)) { |
1cb1edb2 PB |
5952 | fail_req: |
5953 | io_cqring_add_event(req, err); | |
d3656344 | 5954 | io_double_put_req(req); |
196be95c PB |
5955 | break; |
5956 | } | |
fb5ccc98 | 5957 | |
354420f7 | 5958 | trace_io_uring_submit_sqe(ctx, req->opcode, req->user_data, |
0cdaf760 | 5959 | true, io_async_submit(ctx)); |
7d01bd74 | 5960 | err = io_submit_sqe(req, sqe, &link); |
1d4240cc PB |
5961 | if (err) |
5962 | goto fail_req; | |
6c271ce2 JA |
5963 | } |
5964 | ||
9466f437 PB |
5965 | if (unlikely(submitted != nr)) { |
5966 | int ref_used = (submitted == -EAGAIN) ? 0 : submitted; | |
5967 | ||
5968 | percpu_ref_put_many(&ctx->refs, nr - ref_used); | |
5969 | } | |
9e645e11 | 5970 | if (link) |
1b4a51b6 | 5971 | io_queue_link_head(link); |
6c271ce2 JA |
5972 | if (statep) |
5973 | io_submit_state_end(&state); | |
5974 | ||
ae9428ca PB |
5975 | /* Commit SQ ring head once we've consumed and submitted all SQEs */ |
5976 | io_commit_sqring(ctx); | |
5977 | ||
6c271ce2 JA |
5978 | return submitted; |
5979 | } | |
5980 | ||
5981 | static int io_sq_thread(void *data) | |
5982 | { | |
6c271ce2 | 5983 | struct io_ring_ctx *ctx = data; |
181e448d | 5984 | const struct cred *old_cred; |
6c271ce2 | 5985 | DEFINE_WAIT(wait); |
6c271ce2 | 5986 | unsigned long timeout; |
bdcd3eab | 5987 | int ret = 0; |
6c271ce2 | 5988 | |
0f158b4c | 5989 | complete(&ctx->sq_thread_comp); |
a4c0b3de | 5990 | |
181e448d | 5991 | old_cred = override_creds(ctx->creds); |
6c271ce2 | 5992 | |
bdcd3eab | 5993 | timeout = jiffies + ctx->sq_thread_idle; |
2bbcd6d3 | 5994 | while (!kthread_should_park()) { |
fb5ccc98 | 5995 | unsigned int to_submit; |
6c271ce2 | 5996 | |
bdcd3eab | 5997 | if (!list_empty(&ctx->poll_list)) { |
6c271ce2 JA |
5998 | unsigned nr_events = 0; |
5999 | ||
bdcd3eab XW |
6000 | mutex_lock(&ctx->uring_lock); |
6001 | if (!list_empty(&ctx->poll_list)) | |
6002 | io_iopoll_getevents(ctx, &nr_events, 0); | |
6003 | else | |
6c271ce2 | 6004 | timeout = jiffies + ctx->sq_thread_idle; |
bdcd3eab | 6005 | mutex_unlock(&ctx->uring_lock); |
6c271ce2 JA |
6006 | } |
6007 | ||
fb5ccc98 | 6008 | to_submit = io_sqring_entries(ctx); |
c1edbf5f JA |
6009 | |
6010 | /* | |
6011 | * If submit got -EBUSY, flag us as needing the application | |
6012 | * to enter the kernel to reap and flush events. | |
6013 | */ | |
6014 | if (!to_submit || ret == -EBUSY) { | |
7143b5ac SG |
6015 | /* |
6016 | * Drop cur_mm before scheduling, we can't hold it for | |
6017 | * long periods (or over schedule()). Do this before | |
6018 | * adding ourselves to the waitqueue, as the unuse/drop | |
6019 | * may sleep. | |
6020 | */ | |
bf9c2f1c | 6021 | io_sq_thread_drop_mm(ctx); |
7143b5ac | 6022 | |
6c271ce2 JA |
6023 | /* |
6024 | * We're polling. If we're within the defined idle | |
6025 | * period, then let us spin without work before going | |
c1edbf5f JA |
6026 | * to sleep. The exception is if we got EBUSY doing |
6027 | * more IO, we should wait for the application to | |
6028 | * reap events and wake us up. | |
6c271ce2 | 6029 | */ |
bdcd3eab | 6030 | if (!list_empty(&ctx->poll_list) || |
df069d80 JA |
6031 | (!time_after(jiffies, timeout) && ret != -EBUSY && |
6032 | !percpu_ref_is_dying(&ctx->refs))) { | |
b41e9852 JA |
6033 | if (current->task_works) |
6034 | task_work_run(); | |
9831a90c | 6035 | cond_resched(); |
6c271ce2 JA |
6036 | continue; |
6037 | } | |
6038 | ||
6c271ce2 JA |
6039 | prepare_to_wait(&ctx->sqo_wait, &wait, |
6040 | TASK_INTERRUPTIBLE); | |
6041 | ||
bdcd3eab XW |
6042 | /* |
6043 | * While doing polled IO, before going to sleep, we need | |
6044 | * to check if there are new reqs added to poll_list, it | |
6045 | * is because reqs may have been punted to io worker and | |
6046 | * will be added to poll_list later, hence check the | |
6047 | * poll_list again. | |
6048 | */ | |
6049 | if ((ctx->flags & IORING_SETUP_IOPOLL) && | |
6050 | !list_empty_careful(&ctx->poll_list)) { | |
6051 | finish_wait(&ctx->sqo_wait, &wait); | |
6052 | continue; | |
6053 | } | |
6054 | ||
6c271ce2 | 6055 | /* Tell userspace we may need a wakeup call */ |
75b28aff | 6056 | ctx->rings->sq_flags |= IORING_SQ_NEED_WAKEUP; |
0d7bae69 SB |
6057 | /* make sure to read SQ tail after writing flags */ |
6058 | smp_mb(); | |
6c271ce2 | 6059 | |
fb5ccc98 | 6060 | to_submit = io_sqring_entries(ctx); |
c1edbf5f | 6061 | if (!to_submit || ret == -EBUSY) { |
2bbcd6d3 | 6062 | if (kthread_should_park()) { |
6c271ce2 JA |
6063 | finish_wait(&ctx->sqo_wait, &wait); |
6064 | break; | |
6065 | } | |
b41e9852 JA |
6066 | if (current->task_works) { |
6067 | task_work_run(); | |
10bea96d | 6068 | finish_wait(&ctx->sqo_wait, &wait); |
b41e9852 JA |
6069 | continue; |
6070 | } | |
6c271ce2 JA |
6071 | if (signal_pending(current)) |
6072 | flush_signals(current); | |
6073 | schedule(); | |
6074 | finish_wait(&ctx->sqo_wait, &wait); | |
6075 | ||
75b28aff | 6076 | ctx->rings->sq_flags &= ~IORING_SQ_NEED_WAKEUP; |
d4ae271d | 6077 | ret = 0; |
6c271ce2 JA |
6078 | continue; |
6079 | } | |
6080 | finish_wait(&ctx->sqo_wait, &wait); | |
6081 | ||
75b28aff | 6082 | ctx->rings->sq_flags &= ~IORING_SQ_NEED_WAKEUP; |
6c271ce2 JA |
6083 | } |
6084 | ||
8a4955ff | 6085 | mutex_lock(&ctx->uring_lock); |
6b668c9b XW |
6086 | if (likely(!percpu_ref_is_dying(&ctx->refs))) |
6087 | ret = io_submit_sqes(ctx, to_submit, NULL, -1); | |
8a4955ff | 6088 | mutex_unlock(&ctx->uring_lock); |
bdcd3eab | 6089 | timeout = jiffies + ctx->sq_thread_idle; |
6c271ce2 JA |
6090 | } |
6091 | ||
b41e9852 JA |
6092 | if (current->task_works) |
6093 | task_work_run(); | |
6094 | ||
bf9c2f1c | 6095 | io_sq_thread_drop_mm(ctx); |
181e448d | 6096 | revert_creds(old_cred); |
06058632 | 6097 | |
2bbcd6d3 | 6098 | kthread_parkme(); |
06058632 | 6099 | |
6c271ce2 JA |
6100 | return 0; |
6101 | } | |
6102 | ||
bda52162 JA |
6103 | struct io_wait_queue { |
6104 | struct wait_queue_entry wq; | |
6105 | struct io_ring_ctx *ctx; | |
6106 | unsigned to_wait; | |
6107 | unsigned nr_timeouts; | |
6108 | }; | |
6109 | ||
1d7bb1d5 | 6110 | static inline bool io_should_wake(struct io_wait_queue *iowq, bool noflush) |
bda52162 JA |
6111 | { |
6112 | struct io_ring_ctx *ctx = iowq->ctx; | |
6113 | ||
6114 | /* | |
d195a66e | 6115 | * Wake up if we have enough events, or if a timeout occurred since we |
bda52162 JA |
6116 | * started waiting. For timeouts, we always want to return to userspace, |
6117 | * regardless of event count. | |
6118 | */ | |
1d7bb1d5 | 6119 | return io_cqring_events(ctx, noflush) >= iowq->to_wait || |
bda52162 JA |
6120 | atomic_read(&ctx->cq_timeouts) != iowq->nr_timeouts; |
6121 | } | |
6122 | ||
6123 | static int io_wake_function(struct wait_queue_entry *curr, unsigned int mode, | |
6124 | int wake_flags, void *key) | |
6125 | { | |
6126 | struct io_wait_queue *iowq = container_of(curr, struct io_wait_queue, | |
6127 | wq); | |
6128 | ||
1d7bb1d5 JA |
6129 | /* use noflush == true, as we can't safely rely on locking context */ |
6130 | if (!io_should_wake(iowq, true)) | |
bda52162 JA |
6131 | return -1; |
6132 | ||
6133 | return autoremove_wake_function(curr, mode, wake_flags, key); | |
6134 | } | |
6135 | ||
2b188cc1 JA |
6136 | /* |
6137 | * Wait until events become available, if we don't already have some. The | |
6138 | * application must reap them itself, as they reside on the shared cq ring. | |
6139 | */ | |
6140 | static int io_cqring_wait(struct io_ring_ctx *ctx, int min_events, | |
6141 | const sigset_t __user *sig, size_t sigsz) | |
6142 | { | |
bda52162 JA |
6143 | struct io_wait_queue iowq = { |
6144 | .wq = { | |
6145 | .private = current, | |
6146 | .func = io_wake_function, | |
6147 | .entry = LIST_HEAD_INIT(iowq.wq.entry), | |
6148 | }, | |
6149 | .ctx = ctx, | |
6150 | .to_wait = min_events, | |
6151 | }; | |
75b28aff | 6152 | struct io_rings *rings = ctx->rings; |
e9ffa5c2 | 6153 | int ret = 0; |
2b188cc1 | 6154 | |
b41e9852 JA |
6155 | do { |
6156 | if (io_cqring_events(ctx, false) >= min_events) | |
6157 | return 0; | |
6158 | if (!current->task_works) | |
6159 | break; | |
6160 | task_work_run(); | |
6161 | } while (1); | |
2b188cc1 JA |
6162 | |
6163 | if (sig) { | |
9e75ad5d AB |
6164 | #ifdef CONFIG_COMPAT |
6165 | if (in_compat_syscall()) | |
6166 | ret = set_compat_user_sigmask((const compat_sigset_t __user *)sig, | |
b772434b | 6167 | sigsz); |
9e75ad5d AB |
6168 | else |
6169 | #endif | |
b772434b | 6170 | ret = set_user_sigmask(sig, sigsz); |
9e75ad5d | 6171 | |
2b188cc1 JA |
6172 | if (ret) |
6173 | return ret; | |
6174 | } | |
6175 | ||
bda52162 | 6176 | iowq.nr_timeouts = atomic_read(&ctx->cq_timeouts); |
c826bd7a | 6177 | trace_io_uring_cqring_wait(ctx, min_events); |
bda52162 JA |
6178 | do { |
6179 | prepare_to_wait_exclusive(&ctx->wait, &iowq.wq, | |
6180 | TASK_INTERRUPTIBLE); | |
b41e9852 JA |
6181 | if (current->task_works) |
6182 | task_work_run(); | |
1d7bb1d5 | 6183 | if (io_should_wake(&iowq, false)) |
bda52162 JA |
6184 | break; |
6185 | schedule(); | |
6186 | if (signal_pending(current)) { | |
e9ffa5c2 | 6187 | ret = -EINTR; |
bda52162 JA |
6188 | break; |
6189 | } | |
6190 | } while (1); | |
6191 | finish_wait(&ctx->wait, &iowq.wq); | |
6192 | ||
e9ffa5c2 | 6193 | restore_saved_sigmask_unless(ret == -EINTR); |
2b188cc1 | 6194 | |
75b28aff | 6195 | return READ_ONCE(rings->cq.head) == READ_ONCE(rings->cq.tail) ? ret : 0; |
2b188cc1 JA |
6196 | } |
6197 | ||
6b06314c JA |
6198 | static void __io_sqe_files_unregister(struct io_ring_ctx *ctx) |
6199 | { | |
6200 | #if defined(CONFIG_UNIX) | |
6201 | if (ctx->ring_sock) { | |
6202 | struct sock *sock = ctx->ring_sock->sk; | |
6203 | struct sk_buff *skb; | |
6204 | ||
6205 | while ((skb = skb_dequeue(&sock->sk_receive_queue)) != NULL) | |
6206 | kfree_skb(skb); | |
6207 | } | |
6208 | #else | |
6209 | int i; | |
6210 | ||
65e19f54 JA |
6211 | for (i = 0; i < ctx->nr_user_files; i++) { |
6212 | struct file *file; | |
6213 | ||
6214 | file = io_file_from_index(ctx, i); | |
6215 | if (file) | |
6216 | fput(file); | |
6217 | } | |
6b06314c JA |
6218 | #endif |
6219 | } | |
6220 | ||
05f3fb3c JA |
6221 | static void io_file_ref_kill(struct percpu_ref *ref) |
6222 | { | |
6223 | struct fixed_file_data *data; | |
6224 | ||
6225 | data = container_of(ref, struct fixed_file_data, refs); | |
6226 | complete(&data->done); | |
6227 | } | |
6228 | ||
6b06314c JA |
6229 | static int io_sqe_files_unregister(struct io_ring_ctx *ctx) |
6230 | { | |
05f3fb3c | 6231 | struct fixed_file_data *data = ctx->file_data; |
05589553 | 6232 | struct fixed_file_ref_node *ref_node = NULL; |
65e19f54 JA |
6233 | unsigned nr_tables, i; |
6234 | ||
05f3fb3c | 6235 | if (!data) |
6b06314c JA |
6236 | return -ENXIO; |
6237 | ||
6a4d07cd | 6238 | spin_lock(&data->lock); |
05589553 XW |
6239 | if (!list_empty(&data->ref_list)) |
6240 | ref_node = list_first_entry(&data->ref_list, | |
6241 | struct fixed_file_ref_node, node); | |
6a4d07cd | 6242 | spin_unlock(&data->lock); |
05589553 XW |
6243 | if (ref_node) |
6244 | percpu_ref_kill(&ref_node->refs); | |
6245 | ||
6246 | percpu_ref_kill(&data->refs); | |
6247 | ||
6248 | /* wait for all refs nodes to complete */ | |
4a38aed2 | 6249 | flush_delayed_work(&ctx->file_put_work); |
2faf852d | 6250 | wait_for_completion(&data->done); |
05f3fb3c | 6251 | |
6b06314c | 6252 | __io_sqe_files_unregister(ctx); |
65e19f54 JA |
6253 | nr_tables = DIV_ROUND_UP(ctx->nr_user_files, IORING_MAX_FILES_TABLE); |
6254 | for (i = 0; i < nr_tables; i++) | |
05f3fb3c JA |
6255 | kfree(data->table[i].files); |
6256 | kfree(data->table); | |
05589553 XW |
6257 | percpu_ref_exit(&data->refs); |
6258 | kfree(data); | |
05f3fb3c | 6259 | ctx->file_data = NULL; |
6b06314c JA |
6260 | ctx->nr_user_files = 0; |
6261 | return 0; | |
6262 | } | |
6263 | ||
6c271ce2 JA |
6264 | static void io_sq_thread_stop(struct io_ring_ctx *ctx) |
6265 | { | |
6266 | if (ctx->sqo_thread) { | |
0f158b4c | 6267 | wait_for_completion(&ctx->sq_thread_comp); |
2bbcd6d3 RP |
6268 | /* |
6269 | * The park is a bit of a work-around, without it we get | |
6270 | * warning spews on shutdown with SQPOLL set and affinity | |
6271 | * set to a single CPU. | |
6272 | */ | |
06058632 | 6273 | kthread_park(ctx->sqo_thread); |
6c271ce2 JA |
6274 | kthread_stop(ctx->sqo_thread); |
6275 | ctx->sqo_thread = NULL; | |
6276 | } | |
6277 | } | |
6278 | ||
6b06314c JA |
6279 | static void io_finish_async(struct io_ring_ctx *ctx) |
6280 | { | |
6c271ce2 JA |
6281 | io_sq_thread_stop(ctx); |
6282 | ||
561fb04a JA |
6283 | if (ctx->io_wq) { |
6284 | io_wq_destroy(ctx->io_wq); | |
6285 | ctx->io_wq = NULL; | |
6b06314c JA |
6286 | } |
6287 | } | |
6288 | ||
6289 | #if defined(CONFIG_UNIX) | |
6b06314c JA |
6290 | /* |
6291 | * Ensure the UNIX gc is aware of our file set, so we are certain that | |
6292 | * the io_uring can be safely unregistered on process exit, even if we have | |
6293 | * loops in the file referencing. | |
6294 | */ | |
6295 | static int __io_sqe_files_scm(struct io_ring_ctx *ctx, int nr, int offset) | |
6296 | { | |
6297 | struct sock *sk = ctx->ring_sock->sk; | |
6298 | struct scm_fp_list *fpl; | |
6299 | struct sk_buff *skb; | |
08a45173 | 6300 | int i, nr_files; |
6b06314c | 6301 | |
6b06314c JA |
6302 | fpl = kzalloc(sizeof(*fpl), GFP_KERNEL); |
6303 | if (!fpl) | |
6304 | return -ENOMEM; | |
6305 | ||
6306 | skb = alloc_skb(0, GFP_KERNEL); | |
6307 | if (!skb) { | |
6308 | kfree(fpl); | |
6309 | return -ENOMEM; | |
6310 | } | |
6311 | ||
6312 | skb->sk = sk; | |
6b06314c | 6313 | |
08a45173 | 6314 | nr_files = 0; |
6b06314c JA |
6315 | fpl->user = get_uid(ctx->user); |
6316 | for (i = 0; i < nr; i++) { | |
65e19f54 JA |
6317 | struct file *file = io_file_from_index(ctx, i + offset); |
6318 | ||
6319 | if (!file) | |
08a45173 | 6320 | continue; |
65e19f54 | 6321 | fpl->fp[nr_files] = get_file(file); |
08a45173 JA |
6322 | unix_inflight(fpl->user, fpl->fp[nr_files]); |
6323 | nr_files++; | |
6b06314c JA |
6324 | } |
6325 | ||
08a45173 JA |
6326 | if (nr_files) { |
6327 | fpl->max = SCM_MAX_FD; | |
6328 | fpl->count = nr_files; | |
6329 | UNIXCB(skb).fp = fpl; | |
05f3fb3c | 6330 | skb->destructor = unix_destruct_scm; |
08a45173 JA |
6331 | refcount_add(skb->truesize, &sk->sk_wmem_alloc); |
6332 | skb_queue_head(&sk->sk_receive_queue, skb); | |
6b06314c | 6333 | |
08a45173 JA |
6334 | for (i = 0; i < nr_files; i++) |
6335 | fput(fpl->fp[i]); | |
6336 | } else { | |
6337 | kfree_skb(skb); | |
6338 | kfree(fpl); | |
6339 | } | |
6b06314c JA |
6340 | |
6341 | return 0; | |
6342 | } | |
6343 | ||
6344 | /* | |
6345 | * If UNIX sockets are enabled, fd passing can cause a reference cycle which | |
6346 | * causes regular reference counting to break down. We rely on the UNIX | |
6347 | * garbage collection to take care of this problem for us. | |
6348 | */ | |
6349 | static int io_sqe_files_scm(struct io_ring_ctx *ctx) | |
6350 | { | |
6351 | unsigned left, total; | |
6352 | int ret = 0; | |
6353 | ||
6354 | total = 0; | |
6355 | left = ctx->nr_user_files; | |
6356 | while (left) { | |
6357 | unsigned this_files = min_t(unsigned, left, SCM_MAX_FD); | |
6b06314c JA |
6358 | |
6359 | ret = __io_sqe_files_scm(ctx, this_files, total); | |
6360 | if (ret) | |
6361 | break; | |
6362 | left -= this_files; | |
6363 | total += this_files; | |
6364 | } | |
6365 | ||
6366 | if (!ret) | |
6367 | return 0; | |
6368 | ||
6369 | while (total < ctx->nr_user_files) { | |
65e19f54 JA |
6370 | struct file *file = io_file_from_index(ctx, total); |
6371 | ||
6372 | if (file) | |
6373 | fput(file); | |
6b06314c JA |
6374 | total++; |
6375 | } | |
6376 | ||
6377 | return ret; | |
6378 | } | |
6379 | #else | |
6380 | static int io_sqe_files_scm(struct io_ring_ctx *ctx) | |
6381 | { | |
6382 | return 0; | |
6383 | } | |
6384 | #endif | |
6385 | ||
65e19f54 JA |
6386 | static int io_sqe_alloc_file_tables(struct io_ring_ctx *ctx, unsigned nr_tables, |
6387 | unsigned nr_files) | |
6388 | { | |
6389 | int i; | |
6390 | ||
6391 | for (i = 0; i < nr_tables; i++) { | |
05f3fb3c | 6392 | struct fixed_file_table *table = &ctx->file_data->table[i]; |
65e19f54 JA |
6393 | unsigned this_files; |
6394 | ||
6395 | this_files = min(nr_files, IORING_MAX_FILES_TABLE); | |
6396 | table->files = kcalloc(this_files, sizeof(struct file *), | |
6397 | GFP_KERNEL); | |
6398 | if (!table->files) | |
6399 | break; | |
6400 | nr_files -= this_files; | |
6401 | } | |
6402 | ||
6403 | if (i == nr_tables) | |
6404 | return 0; | |
6405 | ||
6406 | for (i = 0; i < nr_tables; i++) { | |
05f3fb3c | 6407 | struct fixed_file_table *table = &ctx->file_data->table[i]; |
65e19f54 JA |
6408 | kfree(table->files); |
6409 | } | |
6410 | return 1; | |
6411 | } | |
6412 | ||
05f3fb3c JA |
6413 | static void io_ring_file_put(struct io_ring_ctx *ctx, struct file *file) |
6414 | { | |
6415 | #if defined(CONFIG_UNIX) | |
6416 | struct sock *sock = ctx->ring_sock->sk; | |
6417 | struct sk_buff_head list, *head = &sock->sk_receive_queue; | |
6418 | struct sk_buff *skb; | |
6419 | int i; | |
6420 | ||
6421 | __skb_queue_head_init(&list); | |
6422 | ||
6423 | /* | |
6424 | * Find the skb that holds this file in its SCM_RIGHTS. When found, | |
6425 | * remove this entry and rearrange the file array. | |
6426 | */ | |
6427 | skb = skb_dequeue(head); | |
6428 | while (skb) { | |
6429 | struct scm_fp_list *fp; | |
6430 | ||
6431 | fp = UNIXCB(skb).fp; | |
6432 | for (i = 0; i < fp->count; i++) { | |
6433 | int left; | |
6434 | ||
6435 | if (fp->fp[i] != file) | |
6436 | continue; | |
6437 | ||
6438 | unix_notinflight(fp->user, fp->fp[i]); | |
6439 | left = fp->count - 1 - i; | |
6440 | if (left) { | |
6441 | memmove(&fp->fp[i], &fp->fp[i + 1], | |
6442 | left * sizeof(struct file *)); | |
6443 | } | |
6444 | fp->count--; | |
6445 | if (!fp->count) { | |
6446 | kfree_skb(skb); | |
6447 | skb = NULL; | |
6448 | } else { | |
6449 | __skb_queue_tail(&list, skb); | |
6450 | } | |
6451 | fput(file); | |
6452 | file = NULL; | |
6453 | break; | |
6454 | } | |
6455 | ||
6456 | if (!file) | |
6457 | break; | |
6458 | ||
6459 | __skb_queue_tail(&list, skb); | |
6460 | ||
6461 | skb = skb_dequeue(head); | |
6462 | } | |
6463 | ||
6464 | if (skb_peek(&list)) { | |
6465 | spin_lock_irq(&head->lock); | |
6466 | while ((skb = __skb_dequeue(&list)) != NULL) | |
6467 | __skb_queue_tail(head, skb); | |
6468 | spin_unlock_irq(&head->lock); | |
6469 | } | |
6470 | #else | |
6471 | fput(file); | |
6472 | #endif | |
6473 | } | |
6474 | ||
6475 | struct io_file_put { | |
05589553 | 6476 | struct list_head list; |
05f3fb3c | 6477 | struct file *file; |
05f3fb3c JA |
6478 | }; |
6479 | ||
4a38aed2 | 6480 | static void __io_file_put_work(struct fixed_file_ref_node *ref_node) |
65e19f54 | 6481 | { |
4a38aed2 JA |
6482 | struct fixed_file_data *file_data = ref_node->file_data; |
6483 | struct io_ring_ctx *ctx = file_data->ctx; | |
05f3fb3c | 6484 | struct io_file_put *pfile, *tmp; |
05589553 XW |
6485 | |
6486 | list_for_each_entry_safe(pfile, tmp, &ref_node->file_list, list) { | |
6a4d07cd | 6487 | list_del(&pfile->list); |
05589553 XW |
6488 | io_ring_file_put(ctx, pfile->file); |
6489 | kfree(pfile); | |
65e19f54 | 6490 | } |
05589553 | 6491 | |
6a4d07cd JA |
6492 | spin_lock(&file_data->lock); |
6493 | list_del(&ref_node->node); | |
6494 | spin_unlock(&file_data->lock); | |
05589553 XW |
6495 | |
6496 | percpu_ref_exit(&ref_node->refs); | |
6497 | kfree(ref_node); | |
6498 | percpu_ref_put(&file_data->refs); | |
2faf852d | 6499 | } |
65e19f54 | 6500 | |
4a38aed2 JA |
6501 | static void io_file_put_work(struct work_struct *work) |
6502 | { | |
6503 | struct io_ring_ctx *ctx; | |
6504 | struct llist_node *node; | |
6505 | ||
6506 | ctx = container_of(work, struct io_ring_ctx, file_put_work.work); | |
6507 | node = llist_del_all(&ctx->file_put_llist); | |
6508 | ||
6509 | while (node) { | |
6510 | struct fixed_file_ref_node *ref_node; | |
6511 | struct llist_node *next = node->next; | |
6512 | ||
6513 | ref_node = llist_entry(node, struct fixed_file_ref_node, llist); | |
6514 | __io_file_put_work(ref_node); | |
6515 | node = next; | |
6516 | } | |
6517 | } | |
6518 | ||
05589553 | 6519 | static void io_file_data_ref_zero(struct percpu_ref *ref) |
2faf852d | 6520 | { |
05589553 | 6521 | struct fixed_file_ref_node *ref_node; |
4a38aed2 JA |
6522 | struct io_ring_ctx *ctx; |
6523 | bool first_add; | |
6524 | int delay = HZ; | |
65e19f54 | 6525 | |
05589553 | 6526 | ref_node = container_of(ref, struct fixed_file_ref_node, refs); |
4a38aed2 | 6527 | ctx = ref_node->file_data->ctx; |
05589553 | 6528 | |
4a38aed2 JA |
6529 | if (percpu_ref_is_dying(&ctx->file_data->refs)) |
6530 | delay = 0; | |
05589553 | 6531 | |
4a38aed2 JA |
6532 | first_add = llist_add(&ref_node->llist, &ctx->file_put_llist); |
6533 | if (!delay) | |
6534 | mod_delayed_work(system_wq, &ctx->file_put_work, 0); | |
6535 | else if (first_add) | |
6536 | queue_delayed_work(system_wq, &ctx->file_put_work, delay); | |
05f3fb3c | 6537 | } |
65e19f54 | 6538 | |
05589553 XW |
6539 | static struct fixed_file_ref_node *alloc_fixed_file_ref_node( |
6540 | struct io_ring_ctx *ctx) | |
05f3fb3c | 6541 | { |
05589553 | 6542 | struct fixed_file_ref_node *ref_node; |
05f3fb3c | 6543 | |
05589553 XW |
6544 | ref_node = kzalloc(sizeof(*ref_node), GFP_KERNEL); |
6545 | if (!ref_node) | |
6546 | return ERR_PTR(-ENOMEM); | |
05f3fb3c | 6547 | |
05589553 XW |
6548 | if (percpu_ref_init(&ref_node->refs, io_file_data_ref_zero, |
6549 | 0, GFP_KERNEL)) { | |
6550 | kfree(ref_node); | |
6551 | return ERR_PTR(-ENOMEM); | |
6552 | } | |
6553 | INIT_LIST_HEAD(&ref_node->node); | |
6554 | INIT_LIST_HEAD(&ref_node->file_list); | |
05589553 XW |
6555 | ref_node->file_data = ctx->file_data; |
6556 | return ref_node; | |
05589553 XW |
6557 | } |
6558 | ||
6559 | static void destroy_fixed_file_ref_node(struct fixed_file_ref_node *ref_node) | |
6560 | { | |
6561 | percpu_ref_exit(&ref_node->refs); | |
6562 | kfree(ref_node); | |
65e19f54 JA |
6563 | } |
6564 | ||
6b06314c JA |
6565 | static int io_sqe_files_register(struct io_ring_ctx *ctx, void __user *arg, |
6566 | unsigned nr_args) | |
6567 | { | |
6568 | __s32 __user *fds = (__s32 __user *) arg; | |
65e19f54 | 6569 | unsigned nr_tables; |
05f3fb3c | 6570 | struct file *file; |
6b06314c JA |
6571 | int fd, ret = 0; |
6572 | unsigned i; | |
05589553 | 6573 | struct fixed_file_ref_node *ref_node; |
6b06314c | 6574 | |
05f3fb3c | 6575 | if (ctx->file_data) |
6b06314c JA |
6576 | return -EBUSY; |
6577 | if (!nr_args) | |
6578 | return -EINVAL; | |
6579 | if (nr_args > IORING_MAX_FIXED_FILES) | |
6580 | return -EMFILE; | |
6581 | ||
05f3fb3c JA |
6582 | ctx->file_data = kzalloc(sizeof(*ctx->file_data), GFP_KERNEL); |
6583 | if (!ctx->file_data) | |
6584 | return -ENOMEM; | |
6585 | ctx->file_data->ctx = ctx; | |
6586 | init_completion(&ctx->file_data->done); | |
05589553 | 6587 | INIT_LIST_HEAD(&ctx->file_data->ref_list); |
f7fe9346 | 6588 | spin_lock_init(&ctx->file_data->lock); |
05f3fb3c | 6589 | |
65e19f54 | 6590 | nr_tables = DIV_ROUND_UP(nr_args, IORING_MAX_FILES_TABLE); |
05f3fb3c JA |
6591 | ctx->file_data->table = kcalloc(nr_tables, |
6592 | sizeof(struct fixed_file_table), | |
65e19f54 | 6593 | GFP_KERNEL); |
05f3fb3c JA |
6594 | if (!ctx->file_data->table) { |
6595 | kfree(ctx->file_data); | |
6596 | ctx->file_data = NULL; | |
6b06314c | 6597 | return -ENOMEM; |
05f3fb3c JA |
6598 | } |
6599 | ||
05589553 | 6600 | if (percpu_ref_init(&ctx->file_data->refs, io_file_ref_kill, |
05f3fb3c JA |
6601 | PERCPU_REF_ALLOW_REINIT, GFP_KERNEL)) { |
6602 | kfree(ctx->file_data->table); | |
6603 | kfree(ctx->file_data); | |
6604 | ctx->file_data = NULL; | |
6b06314c | 6605 | return -ENOMEM; |
05f3fb3c | 6606 | } |
6b06314c | 6607 | |
65e19f54 | 6608 | if (io_sqe_alloc_file_tables(ctx, nr_tables, nr_args)) { |
05f3fb3c JA |
6609 | percpu_ref_exit(&ctx->file_data->refs); |
6610 | kfree(ctx->file_data->table); | |
6611 | kfree(ctx->file_data); | |
6612 | ctx->file_data = NULL; | |
65e19f54 JA |
6613 | return -ENOMEM; |
6614 | } | |
6615 | ||
08a45173 | 6616 | for (i = 0; i < nr_args; i++, ctx->nr_user_files++) { |
65e19f54 JA |
6617 | struct fixed_file_table *table; |
6618 | unsigned index; | |
6619 | ||
6b06314c JA |
6620 | ret = -EFAULT; |
6621 | if (copy_from_user(&fd, &fds[i], sizeof(fd))) | |
6622 | break; | |
08a45173 JA |
6623 | /* allow sparse sets */ |
6624 | if (fd == -1) { | |
6625 | ret = 0; | |
6626 | continue; | |
6627 | } | |
6b06314c | 6628 | |
05f3fb3c | 6629 | table = &ctx->file_data->table[i >> IORING_FILE_TABLE_SHIFT]; |
65e19f54 | 6630 | index = i & IORING_FILE_TABLE_MASK; |
05f3fb3c | 6631 | file = fget(fd); |
6b06314c JA |
6632 | |
6633 | ret = -EBADF; | |
05f3fb3c | 6634 | if (!file) |
6b06314c | 6635 | break; |
05f3fb3c | 6636 | |
6b06314c JA |
6637 | /* |
6638 | * Don't allow io_uring instances to be registered. If UNIX | |
6639 | * isn't enabled, then this causes a reference cycle and this | |
6640 | * instance can never get freed. If UNIX is enabled we'll | |
6641 | * handle it just fine, but there's still no point in allowing | |
6642 | * a ring fd as it doesn't support regular read/write anyway. | |
6643 | */ | |
05f3fb3c JA |
6644 | if (file->f_op == &io_uring_fops) { |
6645 | fput(file); | |
6b06314c JA |
6646 | break; |
6647 | } | |
6b06314c | 6648 | ret = 0; |
05f3fb3c | 6649 | table->files[index] = file; |
6b06314c JA |
6650 | } |
6651 | ||
6652 | if (ret) { | |
65e19f54 | 6653 | for (i = 0; i < ctx->nr_user_files; i++) { |
65e19f54 JA |
6654 | file = io_file_from_index(ctx, i); |
6655 | if (file) | |
6656 | fput(file); | |
6657 | } | |
6658 | for (i = 0; i < nr_tables; i++) | |
05f3fb3c | 6659 | kfree(ctx->file_data->table[i].files); |
6b06314c | 6660 | |
05f3fb3c JA |
6661 | kfree(ctx->file_data->table); |
6662 | kfree(ctx->file_data); | |
6663 | ctx->file_data = NULL; | |
6b06314c JA |
6664 | ctx->nr_user_files = 0; |
6665 | return ret; | |
6666 | } | |
6667 | ||
6668 | ret = io_sqe_files_scm(ctx); | |
05589553 | 6669 | if (ret) { |
6b06314c | 6670 | io_sqe_files_unregister(ctx); |
05589553 XW |
6671 | return ret; |
6672 | } | |
6b06314c | 6673 | |
05589553 XW |
6674 | ref_node = alloc_fixed_file_ref_node(ctx); |
6675 | if (IS_ERR(ref_node)) { | |
6676 | io_sqe_files_unregister(ctx); | |
6677 | return PTR_ERR(ref_node); | |
6678 | } | |
6679 | ||
6680 | ctx->file_data->cur_refs = &ref_node->refs; | |
6a4d07cd | 6681 | spin_lock(&ctx->file_data->lock); |
05589553 | 6682 | list_add(&ref_node->node, &ctx->file_data->ref_list); |
6a4d07cd | 6683 | spin_unlock(&ctx->file_data->lock); |
05589553 | 6684 | percpu_ref_get(&ctx->file_data->refs); |
6b06314c JA |
6685 | return ret; |
6686 | } | |
6687 | ||
c3a31e60 JA |
6688 | static int io_sqe_file_register(struct io_ring_ctx *ctx, struct file *file, |
6689 | int index) | |
6690 | { | |
6691 | #if defined(CONFIG_UNIX) | |
6692 | struct sock *sock = ctx->ring_sock->sk; | |
6693 | struct sk_buff_head *head = &sock->sk_receive_queue; | |
6694 | struct sk_buff *skb; | |
6695 | ||
6696 | /* | |
6697 | * See if we can merge this file into an existing skb SCM_RIGHTS | |
6698 | * file set. If there's no room, fall back to allocating a new skb | |
6699 | * and filling it in. | |
6700 | */ | |
6701 | spin_lock_irq(&head->lock); | |
6702 | skb = skb_peek(head); | |
6703 | if (skb) { | |
6704 | struct scm_fp_list *fpl = UNIXCB(skb).fp; | |
6705 | ||
6706 | if (fpl->count < SCM_MAX_FD) { | |
6707 | __skb_unlink(skb, head); | |
6708 | spin_unlock_irq(&head->lock); | |
6709 | fpl->fp[fpl->count] = get_file(file); | |
6710 | unix_inflight(fpl->user, fpl->fp[fpl->count]); | |
6711 | fpl->count++; | |
6712 | spin_lock_irq(&head->lock); | |
6713 | __skb_queue_head(head, skb); | |
6714 | } else { | |
6715 | skb = NULL; | |
6716 | } | |
6717 | } | |
6718 | spin_unlock_irq(&head->lock); | |
6719 | ||
6720 | if (skb) { | |
6721 | fput(file); | |
6722 | return 0; | |
6723 | } | |
6724 | ||
6725 | return __io_sqe_files_scm(ctx, 1, index); | |
6726 | #else | |
6727 | return 0; | |
6728 | #endif | |
6729 | } | |
6730 | ||
a5318d3c | 6731 | static int io_queue_file_removal(struct fixed_file_data *data, |
05589553 | 6732 | struct file *file) |
05f3fb3c | 6733 | { |
a5318d3c | 6734 | struct io_file_put *pfile; |
05589553 XW |
6735 | struct percpu_ref *refs = data->cur_refs; |
6736 | struct fixed_file_ref_node *ref_node; | |
05f3fb3c | 6737 | |
05f3fb3c | 6738 | pfile = kzalloc(sizeof(*pfile), GFP_KERNEL); |
a5318d3c HD |
6739 | if (!pfile) |
6740 | return -ENOMEM; | |
05f3fb3c | 6741 | |
05589553 | 6742 | ref_node = container_of(refs, struct fixed_file_ref_node, refs); |
05f3fb3c | 6743 | pfile->file = file; |
05589553 XW |
6744 | list_add(&pfile->list, &ref_node->file_list); |
6745 | ||
a5318d3c | 6746 | return 0; |
05f3fb3c JA |
6747 | } |
6748 | ||
6749 | static int __io_sqe_files_update(struct io_ring_ctx *ctx, | |
6750 | struct io_uring_files_update *up, | |
6751 | unsigned nr_args) | |
6752 | { | |
6753 | struct fixed_file_data *data = ctx->file_data; | |
05589553 | 6754 | struct fixed_file_ref_node *ref_node; |
05f3fb3c | 6755 | struct file *file; |
c3a31e60 JA |
6756 | __s32 __user *fds; |
6757 | int fd, i, err; | |
6758 | __u32 done; | |
05589553 | 6759 | bool needs_switch = false; |
c3a31e60 | 6760 | |
05f3fb3c | 6761 | if (check_add_overflow(up->offset, nr_args, &done)) |
c3a31e60 JA |
6762 | return -EOVERFLOW; |
6763 | if (done > ctx->nr_user_files) | |
6764 | return -EINVAL; | |
6765 | ||
05589553 XW |
6766 | ref_node = alloc_fixed_file_ref_node(ctx); |
6767 | if (IS_ERR(ref_node)) | |
6768 | return PTR_ERR(ref_node); | |
6769 | ||
c3a31e60 | 6770 | done = 0; |
05f3fb3c | 6771 | fds = u64_to_user_ptr(up->fds); |
c3a31e60 | 6772 | while (nr_args) { |
65e19f54 JA |
6773 | struct fixed_file_table *table; |
6774 | unsigned index; | |
6775 | ||
c3a31e60 JA |
6776 | err = 0; |
6777 | if (copy_from_user(&fd, &fds[done], sizeof(fd))) { | |
6778 | err = -EFAULT; | |
6779 | break; | |
6780 | } | |
05f3fb3c JA |
6781 | i = array_index_nospec(up->offset, ctx->nr_user_files); |
6782 | table = &ctx->file_data->table[i >> IORING_FILE_TABLE_SHIFT]; | |
65e19f54 JA |
6783 | index = i & IORING_FILE_TABLE_MASK; |
6784 | if (table->files[index]) { | |
05f3fb3c | 6785 | file = io_file_from_index(ctx, index); |
a5318d3c HD |
6786 | err = io_queue_file_removal(data, file); |
6787 | if (err) | |
6788 | break; | |
65e19f54 | 6789 | table->files[index] = NULL; |
05589553 | 6790 | needs_switch = true; |
c3a31e60 JA |
6791 | } |
6792 | if (fd != -1) { | |
c3a31e60 JA |
6793 | file = fget(fd); |
6794 | if (!file) { | |
6795 | err = -EBADF; | |
6796 | break; | |
6797 | } | |
6798 | /* | |
6799 | * Don't allow io_uring instances to be registered. If | |
6800 | * UNIX isn't enabled, then this causes a reference | |
6801 | * cycle and this instance can never get freed. If UNIX | |
6802 | * is enabled we'll handle it just fine, but there's | |
6803 | * still no point in allowing a ring fd as it doesn't | |
6804 | * support regular read/write anyway. | |
6805 | */ | |
6806 | if (file->f_op == &io_uring_fops) { | |
6807 | fput(file); | |
6808 | err = -EBADF; | |
6809 | break; | |
6810 | } | |
65e19f54 | 6811 | table->files[index] = file; |
c3a31e60 JA |
6812 | err = io_sqe_file_register(ctx, file, i); |
6813 | if (err) | |
6814 | break; | |
6815 | } | |
6816 | nr_args--; | |
6817 | done++; | |
05f3fb3c JA |
6818 | up->offset++; |
6819 | } | |
6820 | ||
05589553 XW |
6821 | if (needs_switch) { |
6822 | percpu_ref_kill(data->cur_refs); | |
6a4d07cd | 6823 | spin_lock(&data->lock); |
05589553 XW |
6824 | list_add(&ref_node->node, &data->ref_list); |
6825 | data->cur_refs = &ref_node->refs; | |
6a4d07cd | 6826 | spin_unlock(&data->lock); |
05589553 XW |
6827 | percpu_ref_get(&ctx->file_data->refs); |
6828 | } else | |
6829 | destroy_fixed_file_ref_node(ref_node); | |
c3a31e60 JA |
6830 | |
6831 | return done ? done : err; | |
6832 | } | |
05589553 | 6833 | |
05f3fb3c JA |
6834 | static int io_sqe_files_update(struct io_ring_ctx *ctx, void __user *arg, |
6835 | unsigned nr_args) | |
6836 | { | |
6837 | struct io_uring_files_update up; | |
6838 | ||
6839 | if (!ctx->file_data) | |
6840 | return -ENXIO; | |
6841 | if (!nr_args) | |
6842 | return -EINVAL; | |
6843 | if (copy_from_user(&up, arg, sizeof(up))) | |
6844 | return -EFAULT; | |
6845 | if (up.resv) | |
6846 | return -EINVAL; | |
6847 | ||
6848 | return __io_sqe_files_update(ctx, &up, nr_args); | |
6849 | } | |
c3a31e60 | 6850 | |
e9fd9396 | 6851 | static void io_free_work(struct io_wq_work *work) |
7d723065 JA |
6852 | { |
6853 | struct io_kiocb *req = container_of(work, struct io_kiocb, work); | |
6854 | ||
e9fd9396 | 6855 | /* Consider that io_steal_work() relies on this ref */ |
7d723065 JA |
6856 | io_put_req(req); |
6857 | } | |
6858 | ||
24369c2e PB |
6859 | static int io_init_wq_offload(struct io_ring_ctx *ctx, |
6860 | struct io_uring_params *p) | |
6861 | { | |
6862 | struct io_wq_data data; | |
6863 | struct fd f; | |
6864 | struct io_ring_ctx *ctx_attach; | |
6865 | unsigned int concurrency; | |
6866 | int ret = 0; | |
6867 | ||
6868 | data.user = ctx->user; | |
e9fd9396 | 6869 | data.free_work = io_free_work; |
f5fa38c5 | 6870 | data.do_work = io_wq_submit_work; |
24369c2e PB |
6871 | |
6872 | if (!(p->flags & IORING_SETUP_ATTACH_WQ)) { | |
6873 | /* Do QD, or 4 * CPUS, whatever is smallest */ | |
6874 | concurrency = min(ctx->sq_entries, 4 * num_online_cpus()); | |
6875 | ||
6876 | ctx->io_wq = io_wq_create(concurrency, &data); | |
6877 | if (IS_ERR(ctx->io_wq)) { | |
6878 | ret = PTR_ERR(ctx->io_wq); | |
6879 | ctx->io_wq = NULL; | |
6880 | } | |
6881 | return ret; | |
6882 | } | |
6883 | ||
6884 | f = fdget(p->wq_fd); | |
6885 | if (!f.file) | |
6886 | return -EBADF; | |
6887 | ||
6888 | if (f.file->f_op != &io_uring_fops) { | |
6889 | ret = -EINVAL; | |
6890 | goto out_fput; | |
6891 | } | |
6892 | ||
6893 | ctx_attach = f.file->private_data; | |
6894 | /* @io_wq is protected by holding the fd */ | |
6895 | if (!io_wq_get(ctx_attach->io_wq, &data)) { | |
6896 | ret = -EINVAL; | |
6897 | goto out_fput; | |
6898 | } | |
6899 | ||
6900 | ctx->io_wq = ctx_attach->io_wq; | |
6901 | out_fput: | |
6902 | fdput(f); | |
6903 | return ret; | |
6904 | } | |
6905 | ||
6c271ce2 JA |
6906 | static int io_sq_offload_start(struct io_ring_ctx *ctx, |
6907 | struct io_uring_params *p) | |
2b188cc1 JA |
6908 | { |
6909 | int ret; | |
6910 | ||
6911 | mmgrab(current->mm); | |
6912 | ctx->sqo_mm = current->mm; | |
6913 | ||
6c271ce2 | 6914 | if (ctx->flags & IORING_SETUP_SQPOLL) { |
3ec482d1 JA |
6915 | ret = -EPERM; |
6916 | if (!capable(CAP_SYS_ADMIN)) | |
6917 | goto err; | |
6918 | ||
917257da JA |
6919 | ctx->sq_thread_idle = msecs_to_jiffies(p->sq_thread_idle); |
6920 | if (!ctx->sq_thread_idle) | |
6921 | ctx->sq_thread_idle = HZ; | |
6922 | ||
6c271ce2 | 6923 | if (p->flags & IORING_SETUP_SQ_AFF) { |
44a9bd18 | 6924 | int cpu = p->sq_thread_cpu; |
6c271ce2 | 6925 | |
917257da | 6926 | ret = -EINVAL; |
44a9bd18 JA |
6927 | if (cpu >= nr_cpu_ids) |
6928 | goto err; | |
7889f44d | 6929 | if (!cpu_online(cpu)) |
917257da JA |
6930 | goto err; |
6931 | ||
6c271ce2 JA |
6932 | ctx->sqo_thread = kthread_create_on_cpu(io_sq_thread, |
6933 | ctx, cpu, | |
6934 | "io_uring-sq"); | |
6935 | } else { | |
6936 | ctx->sqo_thread = kthread_create(io_sq_thread, ctx, | |
6937 | "io_uring-sq"); | |
6938 | } | |
6939 | if (IS_ERR(ctx->sqo_thread)) { | |
6940 | ret = PTR_ERR(ctx->sqo_thread); | |
6941 | ctx->sqo_thread = NULL; | |
6942 | goto err; | |
6943 | } | |
6944 | wake_up_process(ctx->sqo_thread); | |
6945 | } else if (p->flags & IORING_SETUP_SQ_AFF) { | |
6946 | /* Can't have SQ_AFF without SQPOLL */ | |
6947 | ret = -EINVAL; | |
6948 | goto err; | |
6949 | } | |
6950 | ||
24369c2e PB |
6951 | ret = io_init_wq_offload(ctx, p); |
6952 | if (ret) | |
2b188cc1 | 6953 | goto err; |
2b188cc1 JA |
6954 | |
6955 | return 0; | |
6956 | err: | |
54a91f3b | 6957 | io_finish_async(ctx); |
2b188cc1 JA |
6958 | mmdrop(ctx->sqo_mm); |
6959 | ctx->sqo_mm = NULL; | |
6960 | return ret; | |
6961 | } | |
6962 | ||
6963 | static void io_unaccount_mem(struct user_struct *user, unsigned long nr_pages) | |
6964 | { | |
6965 | atomic_long_sub(nr_pages, &user->locked_vm); | |
6966 | } | |
6967 | ||
6968 | static int io_account_mem(struct user_struct *user, unsigned long nr_pages) | |
6969 | { | |
6970 | unsigned long page_limit, cur_pages, new_pages; | |
6971 | ||
6972 | /* Don't allow more pages than we can safely lock */ | |
6973 | page_limit = rlimit(RLIMIT_MEMLOCK) >> PAGE_SHIFT; | |
6974 | ||
6975 | do { | |
6976 | cur_pages = atomic_long_read(&user->locked_vm); | |
6977 | new_pages = cur_pages + nr_pages; | |
6978 | if (new_pages > page_limit) | |
6979 | return -ENOMEM; | |
6980 | } while (atomic_long_cmpxchg(&user->locked_vm, cur_pages, | |
6981 | new_pages) != cur_pages); | |
6982 | ||
6983 | return 0; | |
6984 | } | |
6985 | ||
6986 | static void io_mem_free(void *ptr) | |
6987 | { | |
52e04ef4 MR |
6988 | struct page *page; |
6989 | ||
6990 | if (!ptr) | |
6991 | return; | |
2b188cc1 | 6992 | |
52e04ef4 | 6993 | page = virt_to_head_page(ptr); |
2b188cc1 JA |
6994 | if (put_page_testzero(page)) |
6995 | free_compound_page(page); | |
6996 | } | |
6997 | ||
6998 | static void *io_mem_alloc(size_t size) | |
6999 | { | |
7000 | gfp_t gfp_flags = GFP_KERNEL | __GFP_ZERO | __GFP_NOWARN | __GFP_COMP | | |
7001 | __GFP_NORETRY; | |
7002 | ||
7003 | return (void *) __get_free_pages(gfp_flags, get_order(size)); | |
7004 | } | |
7005 | ||
75b28aff HV |
7006 | static unsigned long rings_size(unsigned sq_entries, unsigned cq_entries, |
7007 | size_t *sq_offset) | |
7008 | { | |
7009 | struct io_rings *rings; | |
7010 | size_t off, sq_array_size; | |
7011 | ||
7012 | off = struct_size(rings, cqes, cq_entries); | |
7013 | if (off == SIZE_MAX) | |
7014 | return SIZE_MAX; | |
7015 | ||
7016 | #ifdef CONFIG_SMP | |
7017 | off = ALIGN(off, SMP_CACHE_BYTES); | |
7018 | if (off == 0) | |
7019 | return SIZE_MAX; | |
7020 | #endif | |
7021 | ||
7022 | sq_array_size = array_size(sizeof(u32), sq_entries); | |
7023 | if (sq_array_size == SIZE_MAX) | |
7024 | return SIZE_MAX; | |
7025 | ||
7026 | if (check_add_overflow(off, sq_array_size, &off)) | |
7027 | return SIZE_MAX; | |
7028 | ||
7029 | if (sq_offset) | |
7030 | *sq_offset = off; | |
7031 | ||
7032 | return off; | |
7033 | } | |
7034 | ||
2b188cc1 JA |
7035 | static unsigned long ring_pages(unsigned sq_entries, unsigned cq_entries) |
7036 | { | |
75b28aff | 7037 | size_t pages; |
2b188cc1 | 7038 | |
75b28aff HV |
7039 | pages = (size_t)1 << get_order( |
7040 | rings_size(sq_entries, cq_entries, NULL)); | |
7041 | pages += (size_t)1 << get_order( | |
7042 | array_size(sizeof(struct io_uring_sqe), sq_entries)); | |
2b188cc1 | 7043 | |
75b28aff | 7044 | return pages; |
2b188cc1 JA |
7045 | } |
7046 | ||
edafccee JA |
7047 | static int io_sqe_buffer_unregister(struct io_ring_ctx *ctx) |
7048 | { | |
7049 | int i, j; | |
7050 | ||
7051 | if (!ctx->user_bufs) | |
7052 | return -ENXIO; | |
7053 | ||
7054 | for (i = 0; i < ctx->nr_user_bufs; i++) { | |
7055 | struct io_mapped_ubuf *imu = &ctx->user_bufs[i]; | |
7056 | ||
7057 | for (j = 0; j < imu->nr_bvecs; j++) | |
f1f6a7dd | 7058 | unpin_user_page(imu->bvec[j].bv_page); |
edafccee JA |
7059 | |
7060 | if (ctx->account_mem) | |
7061 | io_unaccount_mem(ctx->user, imu->nr_bvecs); | |
d4ef6475 | 7062 | kvfree(imu->bvec); |
edafccee JA |
7063 | imu->nr_bvecs = 0; |
7064 | } | |
7065 | ||
7066 | kfree(ctx->user_bufs); | |
7067 | ctx->user_bufs = NULL; | |
7068 | ctx->nr_user_bufs = 0; | |
7069 | return 0; | |
7070 | } | |
7071 | ||
7072 | static int io_copy_iov(struct io_ring_ctx *ctx, struct iovec *dst, | |
7073 | void __user *arg, unsigned index) | |
7074 | { | |
7075 | struct iovec __user *src; | |
7076 | ||
7077 | #ifdef CONFIG_COMPAT | |
7078 | if (ctx->compat) { | |
7079 | struct compat_iovec __user *ciovs; | |
7080 | struct compat_iovec ciov; | |
7081 | ||
7082 | ciovs = (struct compat_iovec __user *) arg; | |
7083 | if (copy_from_user(&ciov, &ciovs[index], sizeof(ciov))) | |
7084 | return -EFAULT; | |
7085 | ||
d55e5f5b | 7086 | dst->iov_base = u64_to_user_ptr((u64)ciov.iov_base); |
edafccee JA |
7087 | dst->iov_len = ciov.iov_len; |
7088 | return 0; | |
7089 | } | |
7090 | #endif | |
7091 | src = (struct iovec __user *) arg; | |
7092 | if (copy_from_user(dst, &src[index], sizeof(*dst))) | |
7093 | return -EFAULT; | |
7094 | return 0; | |
7095 | } | |
7096 | ||
7097 | static int io_sqe_buffer_register(struct io_ring_ctx *ctx, void __user *arg, | |
7098 | unsigned nr_args) | |
7099 | { | |
7100 | struct vm_area_struct **vmas = NULL; | |
7101 | struct page **pages = NULL; | |
7102 | int i, j, got_pages = 0; | |
7103 | int ret = -EINVAL; | |
7104 | ||
7105 | if (ctx->user_bufs) | |
7106 | return -EBUSY; | |
7107 | if (!nr_args || nr_args > UIO_MAXIOV) | |
7108 | return -EINVAL; | |
7109 | ||
7110 | ctx->user_bufs = kcalloc(nr_args, sizeof(struct io_mapped_ubuf), | |
7111 | GFP_KERNEL); | |
7112 | if (!ctx->user_bufs) | |
7113 | return -ENOMEM; | |
7114 | ||
7115 | for (i = 0; i < nr_args; i++) { | |
7116 | struct io_mapped_ubuf *imu = &ctx->user_bufs[i]; | |
7117 | unsigned long off, start, end, ubuf; | |
7118 | int pret, nr_pages; | |
7119 | struct iovec iov; | |
7120 | size_t size; | |
7121 | ||
7122 | ret = io_copy_iov(ctx, &iov, arg, i); | |
7123 | if (ret) | |
a278682d | 7124 | goto err; |
edafccee JA |
7125 | |
7126 | /* | |
7127 | * Don't impose further limits on the size and buffer | |
7128 | * constraints here, we'll -EINVAL later when IO is | |
7129 | * submitted if they are wrong. | |
7130 | */ | |
7131 | ret = -EFAULT; | |
7132 | if (!iov.iov_base || !iov.iov_len) | |
7133 | goto err; | |
7134 | ||
7135 | /* arbitrary limit, but we need something */ | |
7136 | if (iov.iov_len > SZ_1G) | |
7137 | goto err; | |
7138 | ||
7139 | ubuf = (unsigned long) iov.iov_base; | |
7140 | end = (ubuf + iov.iov_len + PAGE_SIZE - 1) >> PAGE_SHIFT; | |
7141 | start = ubuf >> PAGE_SHIFT; | |
7142 | nr_pages = end - start; | |
7143 | ||
7144 | if (ctx->account_mem) { | |
7145 | ret = io_account_mem(ctx->user, nr_pages); | |
7146 | if (ret) | |
7147 | goto err; | |
7148 | } | |
7149 | ||
7150 | ret = 0; | |
7151 | if (!pages || nr_pages > got_pages) { | |
a8c73c1a DE |
7152 | kvfree(vmas); |
7153 | kvfree(pages); | |
d4ef6475 | 7154 | pages = kvmalloc_array(nr_pages, sizeof(struct page *), |
edafccee | 7155 | GFP_KERNEL); |
d4ef6475 | 7156 | vmas = kvmalloc_array(nr_pages, |
edafccee JA |
7157 | sizeof(struct vm_area_struct *), |
7158 | GFP_KERNEL); | |
7159 | if (!pages || !vmas) { | |
7160 | ret = -ENOMEM; | |
7161 | if (ctx->account_mem) | |
7162 | io_unaccount_mem(ctx->user, nr_pages); | |
7163 | goto err; | |
7164 | } | |
7165 | got_pages = nr_pages; | |
7166 | } | |
7167 | ||
d4ef6475 | 7168 | imu->bvec = kvmalloc_array(nr_pages, sizeof(struct bio_vec), |
edafccee JA |
7169 | GFP_KERNEL); |
7170 | ret = -ENOMEM; | |
7171 | if (!imu->bvec) { | |
7172 | if (ctx->account_mem) | |
7173 | io_unaccount_mem(ctx->user, nr_pages); | |
7174 | goto err; | |
7175 | } | |
7176 | ||
7177 | ret = 0; | |
d8ed45c5 | 7178 | mmap_read_lock(current->mm); |
2113b05d | 7179 | pret = pin_user_pages(ubuf, nr_pages, |
932f4a63 IW |
7180 | FOLL_WRITE | FOLL_LONGTERM, |
7181 | pages, vmas); | |
edafccee JA |
7182 | if (pret == nr_pages) { |
7183 | /* don't support file backed memory */ | |
7184 | for (j = 0; j < nr_pages; j++) { | |
7185 | struct vm_area_struct *vma = vmas[j]; | |
7186 | ||
7187 | if (vma->vm_file && | |
7188 | !is_file_hugepages(vma->vm_file)) { | |
7189 | ret = -EOPNOTSUPP; | |
7190 | break; | |
7191 | } | |
7192 | } | |
7193 | } else { | |
7194 | ret = pret < 0 ? pret : -EFAULT; | |
7195 | } | |
d8ed45c5 | 7196 | mmap_read_unlock(current->mm); |
edafccee JA |
7197 | if (ret) { |
7198 | /* | |
7199 | * if we did partial map, or found file backed vmas, | |
7200 | * release any pages we did get | |
7201 | */ | |
27c4d3a3 | 7202 | if (pret > 0) |
f1f6a7dd | 7203 | unpin_user_pages(pages, pret); |
edafccee JA |
7204 | if (ctx->account_mem) |
7205 | io_unaccount_mem(ctx->user, nr_pages); | |
d4ef6475 | 7206 | kvfree(imu->bvec); |
edafccee JA |
7207 | goto err; |
7208 | } | |
7209 | ||
7210 | off = ubuf & ~PAGE_MASK; | |
7211 | size = iov.iov_len; | |
7212 | for (j = 0; j < nr_pages; j++) { | |
7213 | size_t vec_len; | |
7214 | ||
7215 | vec_len = min_t(size_t, size, PAGE_SIZE - off); | |
7216 | imu->bvec[j].bv_page = pages[j]; | |
7217 | imu->bvec[j].bv_len = vec_len; | |
7218 | imu->bvec[j].bv_offset = off; | |
7219 | off = 0; | |
7220 | size -= vec_len; | |
7221 | } | |
7222 | /* store original address for later verification */ | |
7223 | imu->ubuf = ubuf; | |
7224 | imu->len = iov.iov_len; | |
7225 | imu->nr_bvecs = nr_pages; | |
7226 | ||
7227 | ctx->nr_user_bufs++; | |
7228 | } | |
d4ef6475 MR |
7229 | kvfree(pages); |
7230 | kvfree(vmas); | |
edafccee JA |
7231 | return 0; |
7232 | err: | |
d4ef6475 MR |
7233 | kvfree(pages); |
7234 | kvfree(vmas); | |
edafccee JA |
7235 | io_sqe_buffer_unregister(ctx); |
7236 | return ret; | |
7237 | } | |
7238 | ||
9b402849 JA |
7239 | static int io_eventfd_register(struct io_ring_ctx *ctx, void __user *arg) |
7240 | { | |
7241 | __s32 __user *fds = arg; | |
7242 | int fd; | |
7243 | ||
7244 | if (ctx->cq_ev_fd) | |
7245 | return -EBUSY; | |
7246 | ||
7247 | if (copy_from_user(&fd, fds, sizeof(*fds))) | |
7248 | return -EFAULT; | |
7249 | ||
7250 | ctx->cq_ev_fd = eventfd_ctx_fdget(fd); | |
7251 | if (IS_ERR(ctx->cq_ev_fd)) { | |
7252 | int ret = PTR_ERR(ctx->cq_ev_fd); | |
7253 | ctx->cq_ev_fd = NULL; | |
7254 | return ret; | |
7255 | } | |
7256 | ||
7257 | return 0; | |
7258 | } | |
7259 | ||
7260 | static int io_eventfd_unregister(struct io_ring_ctx *ctx) | |
7261 | { | |
7262 | if (ctx->cq_ev_fd) { | |
7263 | eventfd_ctx_put(ctx->cq_ev_fd); | |
7264 | ctx->cq_ev_fd = NULL; | |
7265 | return 0; | |
7266 | } | |
7267 | ||
7268 | return -ENXIO; | |
7269 | } | |
7270 | ||
5a2e745d JA |
7271 | static int __io_destroy_buffers(int id, void *p, void *data) |
7272 | { | |
7273 | struct io_ring_ctx *ctx = data; | |
7274 | struct io_buffer *buf = p; | |
7275 | ||
067524e9 | 7276 | __io_remove_buffers(ctx, buf, id, -1U); |
5a2e745d JA |
7277 | return 0; |
7278 | } | |
7279 | ||
7280 | static void io_destroy_buffers(struct io_ring_ctx *ctx) | |
7281 | { | |
7282 | idr_for_each(&ctx->io_buffer_idr, __io_destroy_buffers, ctx); | |
7283 | idr_destroy(&ctx->io_buffer_idr); | |
7284 | } | |
7285 | ||
2b188cc1 JA |
7286 | static void io_ring_ctx_free(struct io_ring_ctx *ctx) |
7287 | { | |
6b06314c | 7288 | io_finish_async(ctx); |
2b188cc1 JA |
7289 | if (ctx->sqo_mm) |
7290 | mmdrop(ctx->sqo_mm); | |
def596e9 JA |
7291 | |
7292 | io_iopoll_reap_events(ctx); | |
edafccee | 7293 | io_sqe_buffer_unregister(ctx); |
6b06314c | 7294 | io_sqe_files_unregister(ctx); |
9b402849 | 7295 | io_eventfd_unregister(ctx); |
5a2e745d | 7296 | io_destroy_buffers(ctx); |
41726c9a | 7297 | idr_destroy(&ctx->personality_idr); |
def596e9 | 7298 | |
2b188cc1 | 7299 | #if defined(CONFIG_UNIX) |
355e8d26 EB |
7300 | if (ctx->ring_sock) { |
7301 | ctx->ring_sock->file = NULL; /* so that iput() is called */ | |
2b188cc1 | 7302 | sock_release(ctx->ring_sock); |
355e8d26 | 7303 | } |
2b188cc1 JA |
7304 | #endif |
7305 | ||
75b28aff | 7306 | io_mem_free(ctx->rings); |
2b188cc1 | 7307 | io_mem_free(ctx->sq_sqes); |
2b188cc1 JA |
7308 | |
7309 | percpu_ref_exit(&ctx->refs); | |
7310 | if (ctx->account_mem) | |
7311 | io_unaccount_mem(ctx->user, | |
7312 | ring_pages(ctx->sq_entries, ctx->cq_entries)); | |
7313 | free_uid(ctx->user); | |
181e448d | 7314 | put_cred(ctx->creds); |
78076bb6 | 7315 | kfree(ctx->cancel_hash); |
0ddf92e8 | 7316 | kmem_cache_free(req_cachep, ctx->fallback_req); |
2b188cc1 JA |
7317 | kfree(ctx); |
7318 | } | |
7319 | ||
7320 | static __poll_t io_uring_poll(struct file *file, poll_table *wait) | |
7321 | { | |
7322 | struct io_ring_ctx *ctx = file->private_data; | |
7323 | __poll_t mask = 0; | |
7324 | ||
7325 | poll_wait(file, &ctx->cq_wait, wait); | |
4f7067c3 SB |
7326 | /* |
7327 | * synchronizes with barrier from wq_has_sleeper call in | |
7328 | * io_commit_cqring | |
7329 | */ | |
2b188cc1 | 7330 | smp_rmb(); |
75b28aff HV |
7331 | if (READ_ONCE(ctx->rings->sq.tail) - ctx->cached_sq_head != |
7332 | ctx->rings->sq_ring_entries) | |
2b188cc1 | 7333 | mask |= EPOLLOUT | EPOLLWRNORM; |
63e5d81f | 7334 | if (io_cqring_events(ctx, false)) |
2b188cc1 JA |
7335 | mask |= EPOLLIN | EPOLLRDNORM; |
7336 | ||
7337 | return mask; | |
7338 | } | |
7339 | ||
7340 | static int io_uring_fasync(int fd, struct file *file, int on) | |
7341 | { | |
7342 | struct io_ring_ctx *ctx = file->private_data; | |
7343 | ||
7344 | return fasync_helper(fd, file, on, &ctx->cq_fasync); | |
7345 | } | |
7346 | ||
071698e1 JA |
7347 | static int io_remove_personalities(int id, void *p, void *data) |
7348 | { | |
7349 | struct io_ring_ctx *ctx = data; | |
7350 | const struct cred *cred; | |
7351 | ||
7352 | cred = idr_remove(&ctx->personality_idr, id); | |
7353 | if (cred) | |
7354 | put_cred(cred); | |
7355 | return 0; | |
7356 | } | |
7357 | ||
85faa7b8 JA |
7358 | static void io_ring_exit_work(struct work_struct *work) |
7359 | { | |
7360 | struct io_ring_ctx *ctx; | |
7361 | ||
7362 | ctx = container_of(work, struct io_ring_ctx, exit_work); | |
7363 | if (ctx->rings) | |
7364 | io_cqring_overflow_flush(ctx, true); | |
7365 | ||
0f158b4c | 7366 | wait_for_completion(&ctx->ref_comp); |
85faa7b8 JA |
7367 | io_ring_ctx_free(ctx); |
7368 | } | |
7369 | ||
2b188cc1 JA |
7370 | static void io_ring_ctx_wait_and_kill(struct io_ring_ctx *ctx) |
7371 | { | |
7372 | mutex_lock(&ctx->uring_lock); | |
7373 | percpu_ref_kill(&ctx->refs); | |
7374 | mutex_unlock(&ctx->uring_lock); | |
7375 | ||
5262f567 | 7376 | io_kill_timeouts(ctx); |
221c5eb2 | 7377 | io_poll_remove_all(ctx); |
561fb04a JA |
7378 | |
7379 | if (ctx->io_wq) | |
7380 | io_wq_cancel_all(ctx->io_wq); | |
7381 | ||
def596e9 | 7382 | io_iopoll_reap_events(ctx); |
15dff286 JA |
7383 | /* if we failed setting up the ctx, we might not have any rings */ |
7384 | if (ctx->rings) | |
7385 | io_cqring_overflow_flush(ctx, true); | |
071698e1 | 7386 | idr_for_each(&ctx->personality_idr, io_remove_personalities, ctx); |
85faa7b8 JA |
7387 | INIT_WORK(&ctx->exit_work, io_ring_exit_work); |
7388 | queue_work(system_wq, &ctx->exit_work); | |
2b188cc1 JA |
7389 | } |
7390 | ||
7391 | static int io_uring_release(struct inode *inode, struct file *file) | |
7392 | { | |
7393 | struct io_ring_ctx *ctx = file->private_data; | |
7394 | ||
7395 | file->private_data = NULL; | |
7396 | io_ring_ctx_wait_and_kill(ctx); | |
7397 | return 0; | |
7398 | } | |
7399 | ||
67c4d9e6 PB |
7400 | static bool io_wq_files_match(struct io_wq_work *work, void *data) |
7401 | { | |
7402 | struct files_struct *files = data; | |
7403 | ||
7404 | return work->files == files; | |
7405 | } | |
7406 | ||
fcb323cc JA |
7407 | static void io_uring_cancel_files(struct io_ring_ctx *ctx, |
7408 | struct files_struct *files) | |
7409 | { | |
67c4d9e6 PB |
7410 | if (list_empty_careful(&ctx->inflight_list)) |
7411 | return; | |
7412 | ||
7413 | /* cancel all at once, should be faster than doing it one by one*/ | |
7414 | io_wq_cancel_cb(ctx->io_wq, io_wq_files_match, files, true); | |
7415 | ||
fcb323cc | 7416 | while (!list_empty_careful(&ctx->inflight_list)) { |
d8f1b971 XW |
7417 | struct io_kiocb *cancel_req = NULL, *req; |
7418 | DEFINE_WAIT(wait); | |
fcb323cc JA |
7419 | |
7420 | spin_lock_irq(&ctx->inflight_lock); | |
7421 | list_for_each_entry(req, &ctx->inflight_list, inflight_entry) { | |
768134d4 JA |
7422 | if (req->work.files != files) |
7423 | continue; | |
7424 | /* req is being completed, ignore */ | |
7425 | if (!refcount_inc_not_zero(&req->refs)) | |
7426 | continue; | |
7427 | cancel_req = req; | |
7428 | break; | |
fcb323cc | 7429 | } |
768134d4 | 7430 | if (cancel_req) |
fcb323cc | 7431 | prepare_to_wait(&ctx->inflight_wait, &wait, |
768134d4 | 7432 | TASK_UNINTERRUPTIBLE); |
fcb323cc JA |
7433 | spin_unlock_irq(&ctx->inflight_lock); |
7434 | ||
768134d4 JA |
7435 | /* We need to keep going until we don't find a matching req */ |
7436 | if (!cancel_req) | |
fcb323cc | 7437 | break; |
2f6d9b9d | 7438 | |
2ca10259 JA |
7439 | if (cancel_req->flags & REQ_F_OVERFLOW) { |
7440 | spin_lock_irq(&ctx->completion_lock); | |
7441 | list_del(&cancel_req->list); | |
7442 | cancel_req->flags &= ~REQ_F_OVERFLOW; | |
7443 | if (list_empty(&ctx->cq_overflow_list)) { | |
7444 | clear_bit(0, &ctx->sq_check_overflow); | |
7445 | clear_bit(0, &ctx->cq_check_overflow); | |
7446 | } | |
7447 | spin_unlock_irq(&ctx->completion_lock); | |
7448 | ||
7449 | WRITE_ONCE(ctx->rings->cq_overflow, | |
7450 | atomic_inc_return(&ctx->cached_cq_overflow)); | |
7451 | ||
7452 | /* | |
7453 | * Put inflight ref and overflow ref. If that's | |
7454 | * all we had, then we're done with this request. | |
7455 | */ | |
7456 | if (refcount_sub_and_test(2, &cancel_req->refs)) { | |
4518a3cc | 7457 | io_free_req(cancel_req); |
d8f1b971 | 7458 | finish_wait(&ctx->inflight_wait, &wait); |
2ca10259 JA |
7459 | continue; |
7460 | } | |
7b53d598 PB |
7461 | } else { |
7462 | io_wq_cancel_work(ctx->io_wq, &cancel_req->work); | |
7463 | io_put_req(cancel_req); | |
2ca10259 JA |
7464 | } |
7465 | ||
fcb323cc | 7466 | schedule(); |
d8f1b971 | 7467 | finish_wait(&ctx->inflight_wait, &wait); |
fcb323cc JA |
7468 | } |
7469 | } | |
7470 | ||
801dd57b | 7471 | static bool io_cancel_task_cb(struct io_wq_work *work, void *data) |
44e728b8 | 7472 | { |
801dd57b PB |
7473 | struct io_kiocb *req = container_of(work, struct io_kiocb, work); |
7474 | struct task_struct *task = data; | |
44e728b8 | 7475 | |
801dd57b | 7476 | return req->task == task; |
44e728b8 PB |
7477 | } |
7478 | ||
fcb323cc JA |
7479 | static int io_uring_flush(struct file *file, void *data) |
7480 | { | |
7481 | struct io_ring_ctx *ctx = file->private_data; | |
7482 | ||
7483 | io_uring_cancel_files(ctx, data); | |
6ab23144 JA |
7484 | |
7485 | /* | |
7486 | * If the task is going away, cancel work it may have pending | |
7487 | */ | |
801dd57b PB |
7488 | if (fatal_signal_pending(current) || (current->flags & PF_EXITING)) |
7489 | io_wq_cancel_cb(ctx->io_wq, io_cancel_task_cb, current, true); | |
6ab23144 | 7490 | |
fcb323cc JA |
7491 | return 0; |
7492 | } | |
7493 | ||
6c5c240e RP |
7494 | static void *io_uring_validate_mmap_request(struct file *file, |
7495 | loff_t pgoff, size_t sz) | |
2b188cc1 | 7496 | { |
2b188cc1 | 7497 | struct io_ring_ctx *ctx = file->private_data; |
6c5c240e | 7498 | loff_t offset = pgoff << PAGE_SHIFT; |
2b188cc1 JA |
7499 | struct page *page; |
7500 | void *ptr; | |
7501 | ||
7502 | switch (offset) { | |
7503 | case IORING_OFF_SQ_RING: | |
75b28aff HV |
7504 | case IORING_OFF_CQ_RING: |
7505 | ptr = ctx->rings; | |
2b188cc1 JA |
7506 | break; |
7507 | case IORING_OFF_SQES: | |
7508 | ptr = ctx->sq_sqes; | |
7509 | break; | |
2b188cc1 | 7510 | default: |
6c5c240e | 7511 | return ERR_PTR(-EINVAL); |
2b188cc1 JA |
7512 | } |
7513 | ||
7514 | page = virt_to_head_page(ptr); | |
a50b854e | 7515 | if (sz > page_size(page)) |
6c5c240e RP |
7516 | return ERR_PTR(-EINVAL); |
7517 | ||
7518 | return ptr; | |
7519 | } | |
7520 | ||
7521 | #ifdef CONFIG_MMU | |
7522 | ||
7523 | static int io_uring_mmap(struct file *file, struct vm_area_struct *vma) | |
7524 | { | |
7525 | size_t sz = vma->vm_end - vma->vm_start; | |
7526 | unsigned long pfn; | |
7527 | void *ptr; | |
7528 | ||
7529 | ptr = io_uring_validate_mmap_request(file, vma->vm_pgoff, sz); | |
7530 | if (IS_ERR(ptr)) | |
7531 | return PTR_ERR(ptr); | |
2b188cc1 JA |
7532 | |
7533 | pfn = virt_to_phys(ptr) >> PAGE_SHIFT; | |
7534 | return remap_pfn_range(vma, vma->vm_start, pfn, sz, vma->vm_page_prot); | |
7535 | } | |
7536 | ||
6c5c240e RP |
7537 | #else /* !CONFIG_MMU */ |
7538 | ||
7539 | static int io_uring_mmap(struct file *file, struct vm_area_struct *vma) | |
7540 | { | |
7541 | return vma->vm_flags & (VM_SHARED | VM_MAYSHARE) ? 0 : -EINVAL; | |
7542 | } | |
7543 | ||
7544 | static unsigned int io_uring_nommu_mmap_capabilities(struct file *file) | |
7545 | { | |
7546 | return NOMMU_MAP_DIRECT | NOMMU_MAP_READ | NOMMU_MAP_WRITE; | |
7547 | } | |
7548 | ||
7549 | static unsigned long io_uring_nommu_get_unmapped_area(struct file *file, | |
7550 | unsigned long addr, unsigned long len, | |
7551 | unsigned long pgoff, unsigned long flags) | |
7552 | { | |
7553 | void *ptr; | |
7554 | ||
7555 | ptr = io_uring_validate_mmap_request(file, pgoff, len); | |
7556 | if (IS_ERR(ptr)) | |
7557 | return PTR_ERR(ptr); | |
7558 | ||
7559 | return (unsigned long) ptr; | |
7560 | } | |
7561 | ||
7562 | #endif /* !CONFIG_MMU */ | |
7563 | ||
2b188cc1 JA |
7564 | SYSCALL_DEFINE6(io_uring_enter, unsigned int, fd, u32, to_submit, |
7565 | u32, min_complete, u32, flags, const sigset_t __user *, sig, | |
7566 | size_t, sigsz) | |
7567 | { | |
7568 | struct io_ring_ctx *ctx; | |
7569 | long ret = -EBADF; | |
7570 | int submitted = 0; | |
7571 | struct fd f; | |
7572 | ||
b41e9852 JA |
7573 | if (current->task_works) |
7574 | task_work_run(); | |
7575 | ||
6c271ce2 | 7576 | if (flags & ~(IORING_ENTER_GETEVENTS | IORING_ENTER_SQ_WAKEUP)) |
2b188cc1 JA |
7577 | return -EINVAL; |
7578 | ||
7579 | f = fdget(fd); | |
7580 | if (!f.file) | |
7581 | return -EBADF; | |
7582 | ||
7583 | ret = -EOPNOTSUPP; | |
7584 | if (f.file->f_op != &io_uring_fops) | |
7585 | goto out_fput; | |
7586 | ||
7587 | ret = -ENXIO; | |
7588 | ctx = f.file->private_data; | |
7589 | if (!percpu_ref_tryget(&ctx->refs)) | |
7590 | goto out_fput; | |
7591 | ||
6c271ce2 JA |
7592 | /* |
7593 | * For SQ polling, the thread will do all submissions and completions. | |
7594 | * Just return the requested submit count, and wake the thread if | |
7595 | * we were asked to. | |
7596 | */ | |
b2a9eada | 7597 | ret = 0; |
6c271ce2 | 7598 | if (ctx->flags & IORING_SETUP_SQPOLL) { |
c1edbf5f JA |
7599 | if (!list_empty_careful(&ctx->cq_overflow_list)) |
7600 | io_cqring_overflow_flush(ctx, false); | |
6c271ce2 JA |
7601 | if (flags & IORING_ENTER_SQ_WAKEUP) |
7602 | wake_up(&ctx->sqo_wait); | |
7603 | submitted = to_submit; | |
b2a9eada | 7604 | } else if (to_submit) { |
2b188cc1 | 7605 | mutex_lock(&ctx->uring_lock); |
0cdaf760 | 7606 | submitted = io_submit_sqes(ctx, to_submit, f.file, fd); |
2b188cc1 | 7607 | mutex_unlock(&ctx->uring_lock); |
7c504e65 PB |
7608 | |
7609 | if (submitted != to_submit) | |
7610 | goto out; | |
2b188cc1 JA |
7611 | } |
7612 | if (flags & IORING_ENTER_GETEVENTS) { | |
def596e9 JA |
7613 | unsigned nr_events = 0; |
7614 | ||
2b188cc1 JA |
7615 | min_complete = min(min_complete, ctx->cq_entries); |
7616 | ||
32b2244a XW |
7617 | /* |
7618 | * When SETUP_IOPOLL and SETUP_SQPOLL are both enabled, user | |
7619 | * space applications don't need to do io completion events | |
7620 | * polling again, they can rely on io_sq_thread to do polling | |
7621 | * work, which can reduce cpu usage and uring_lock contention. | |
7622 | */ | |
7623 | if (ctx->flags & IORING_SETUP_IOPOLL && | |
7624 | !(ctx->flags & IORING_SETUP_SQPOLL)) { | |
def596e9 | 7625 | ret = io_iopoll_check(ctx, &nr_events, min_complete); |
def596e9 JA |
7626 | } else { |
7627 | ret = io_cqring_wait(ctx, min_complete, sig, sigsz); | |
7628 | } | |
2b188cc1 JA |
7629 | } |
7630 | ||
7c504e65 | 7631 | out: |
6805b32e | 7632 | percpu_ref_put(&ctx->refs); |
2b188cc1 JA |
7633 | out_fput: |
7634 | fdput(f); | |
7635 | return submitted ? submitted : ret; | |
7636 | } | |
7637 | ||
bebdb65e | 7638 | #ifdef CONFIG_PROC_FS |
87ce955b JA |
7639 | static int io_uring_show_cred(int id, void *p, void *data) |
7640 | { | |
7641 | const struct cred *cred = p; | |
7642 | struct seq_file *m = data; | |
7643 | struct user_namespace *uns = seq_user_ns(m); | |
7644 | struct group_info *gi; | |
7645 | kernel_cap_t cap; | |
7646 | unsigned __capi; | |
7647 | int g; | |
7648 | ||
7649 | seq_printf(m, "%5d\n", id); | |
7650 | seq_put_decimal_ull(m, "\tUid:\t", from_kuid_munged(uns, cred->uid)); | |
7651 | seq_put_decimal_ull(m, "\t\t", from_kuid_munged(uns, cred->euid)); | |
7652 | seq_put_decimal_ull(m, "\t\t", from_kuid_munged(uns, cred->suid)); | |
7653 | seq_put_decimal_ull(m, "\t\t", from_kuid_munged(uns, cred->fsuid)); | |
7654 | seq_put_decimal_ull(m, "\n\tGid:\t", from_kgid_munged(uns, cred->gid)); | |
7655 | seq_put_decimal_ull(m, "\t\t", from_kgid_munged(uns, cred->egid)); | |
7656 | seq_put_decimal_ull(m, "\t\t", from_kgid_munged(uns, cred->sgid)); | |
7657 | seq_put_decimal_ull(m, "\t\t", from_kgid_munged(uns, cred->fsgid)); | |
7658 | seq_puts(m, "\n\tGroups:\t"); | |
7659 | gi = cred->group_info; | |
7660 | for (g = 0; g < gi->ngroups; g++) { | |
7661 | seq_put_decimal_ull(m, g ? " " : "", | |
7662 | from_kgid_munged(uns, gi->gid[g])); | |
7663 | } | |
7664 | seq_puts(m, "\n\tCapEff:\t"); | |
7665 | cap = cred->cap_effective; | |
7666 | CAP_FOR_EACH_U32(__capi) | |
7667 | seq_put_hex_ll(m, NULL, cap.cap[CAP_LAST_U32 - __capi], 8); | |
7668 | seq_putc(m, '\n'); | |
7669 | return 0; | |
7670 | } | |
7671 | ||
7672 | static void __io_uring_show_fdinfo(struct io_ring_ctx *ctx, struct seq_file *m) | |
7673 | { | |
7674 | int i; | |
7675 | ||
7676 | mutex_lock(&ctx->uring_lock); | |
7677 | seq_printf(m, "UserFiles:\t%u\n", ctx->nr_user_files); | |
7678 | for (i = 0; i < ctx->nr_user_files; i++) { | |
7679 | struct fixed_file_table *table; | |
7680 | struct file *f; | |
7681 | ||
7682 | table = &ctx->file_data->table[i >> IORING_FILE_TABLE_SHIFT]; | |
7683 | f = table->files[i & IORING_FILE_TABLE_MASK]; | |
7684 | if (f) | |
7685 | seq_printf(m, "%5u: %s\n", i, file_dentry(f)->d_iname); | |
7686 | else | |
7687 | seq_printf(m, "%5u: <none>\n", i); | |
7688 | } | |
7689 | seq_printf(m, "UserBufs:\t%u\n", ctx->nr_user_bufs); | |
7690 | for (i = 0; i < ctx->nr_user_bufs; i++) { | |
7691 | struct io_mapped_ubuf *buf = &ctx->user_bufs[i]; | |
7692 | ||
7693 | seq_printf(m, "%5u: 0x%llx/%u\n", i, buf->ubuf, | |
7694 | (unsigned int) buf->len); | |
7695 | } | |
7696 | if (!idr_is_empty(&ctx->personality_idr)) { | |
7697 | seq_printf(m, "Personalities:\n"); | |
7698 | idr_for_each(&ctx->personality_idr, io_uring_show_cred, m); | |
7699 | } | |
d7718a9d JA |
7700 | seq_printf(m, "PollList:\n"); |
7701 | spin_lock_irq(&ctx->completion_lock); | |
7702 | for (i = 0; i < (1U << ctx->cancel_hash_bits); i++) { | |
7703 | struct hlist_head *list = &ctx->cancel_hash[i]; | |
7704 | struct io_kiocb *req; | |
7705 | ||
7706 | hlist_for_each_entry(req, list, hash_node) | |
7707 | seq_printf(m, " op=%d, task_works=%d\n", req->opcode, | |
7708 | req->task->task_works != NULL); | |
7709 | } | |
7710 | spin_unlock_irq(&ctx->completion_lock); | |
87ce955b JA |
7711 | mutex_unlock(&ctx->uring_lock); |
7712 | } | |
7713 | ||
7714 | static void io_uring_show_fdinfo(struct seq_file *m, struct file *f) | |
7715 | { | |
7716 | struct io_ring_ctx *ctx = f->private_data; | |
7717 | ||
7718 | if (percpu_ref_tryget(&ctx->refs)) { | |
7719 | __io_uring_show_fdinfo(ctx, m); | |
7720 | percpu_ref_put(&ctx->refs); | |
7721 | } | |
7722 | } | |
bebdb65e | 7723 | #endif |
87ce955b | 7724 | |
2b188cc1 JA |
7725 | static const struct file_operations io_uring_fops = { |
7726 | .release = io_uring_release, | |
fcb323cc | 7727 | .flush = io_uring_flush, |
2b188cc1 | 7728 | .mmap = io_uring_mmap, |
6c5c240e RP |
7729 | #ifndef CONFIG_MMU |
7730 | .get_unmapped_area = io_uring_nommu_get_unmapped_area, | |
7731 | .mmap_capabilities = io_uring_nommu_mmap_capabilities, | |
7732 | #endif | |
2b188cc1 JA |
7733 | .poll = io_uring_poll, |
7734 | .fasync = io_uring_fasync, | |
bebdb65e | 7735 | #ifdef CONFIG_PROC_FS |
87ce955b | 7736 | .show_fdinfo = io_uring_show_fdinfo, |
bebdb65e | 7737 | #endif |
2b188cc1 JA |
7738 | }; |
7739 | ||
7740 | static int io_allocate_scq_urings(struct io_ring_ctx *ctx, | |
7741 | struct io_uring_params *p) | |
7742 | { | |
75b28aff HV |
7743 | struct io_rings *rings; |
7744 | size_t size, sq_array_offset; | |
2b188cc1 | 7745 | |
75b28aff HV |
7746 | size = rings_size(p->sq_entries, p->cq_entries, &sq_array_offset); |
7747 | if (size == SIZE_MAX) | |
7748 | return -EOVERFLOW; | |
7749 | ||
7750 | rings = io_mem_alloc(size); | |
7751 | if (!rings) | |
2b188cc1 JA |
7752 | return -ENOMEM; |
7753 | ||
75b28aff HV |
7754 | ctx->rings = rings; |
7755 | ctx->sq_array = (u32 *)((char *)rings + sq_array_offset); | |
7756 | rings->sq_ring_mask = p->sq_entries - 1; | |
7757 | rings->cq_ring_mask = p->cq_entries - 1; | |
7758 | rings->sq_ring_entries = p->sq_entries; | |
7759 | rings->cq_ring_entries = p->cq_entries; | |
7760 | ctx->sq_mask = rings->sq_ring_mask; | |
7761 | ctx->cq_mask = rings->cq_ring_mask; | |
7762 | ctx->sq_entries = rings->sq_ring_entries; | |
7763 | ctx->cq_entries = rings->cq_ring_entries; | |
2b188cc1 JA |
7764 | |
7765 | size = array_size(sizeof(struct io_uring_sqe), p->sq_entries); | |
eb065d30 JA |
7766 | if (size == SIZE_MAX) { |
7767 | io_mem_free(ctx->rings); | |
7768 | ctx->rings = NULL; | |
2b188cc1 | 7769 | return -EOVERFLOW; |
eb065d30 | 7770 | } |
2b188cc1 JA |
7771 | |
7772 | ctx->sq_sqes = io_mem_alloc(size); | |
eb065d30 JA |
7773 | if (!ctx->sq_sqes) { |
7774 | io_mem_free(ctx->rings); | |
7775 | ctx->rings = NULL; | |
2b188cc1 | 7776 | return -ENOMEM; |
eb065d30 | 7777 | } |
2b188cc1 | 7778 | |
2b188cc1 JA |
7779 | return 0; |
7780 | } | |
7781 | ||
7782 | /* | |
7783 | * Allocate an anonymous fd, this is what constitutes the application | |
7784 | * visible backing of an io_uring instance. The application mmaps this | |
7785 | * fd to gain access to the SQ/CQ ring details. If UNIX sockets are enabled, | |
7786 | * we have to tie this fd to a socket for file garbage collection purposes. | |
7787 | */ | |
7788 | static int io_uring_get_fd(struct io_ring_ctx *ctx) | |
7789 | { | |
7790 | struct file *file; | |
7791 | int ret; | |
7792 | ||
7793 | #if defined(CONFIG_UNIX) | |
7794 | ret = sock_create_kern(&init_net, PF_UNIX, SOCK_RAW, IPPROTO_IP, | |
7795 | &ctx->ring_sock); | |
7796 | if (ret) | |
7797 | return ret; | |
7798 | #endif | |
7799 | ||
7800 | ret = get_unused_fd_flags(O_RDWR | O_CLOEXEC); | |
7801 | if (ret < 0) | |
7802 | goto err; | |
7803 | ||
7804 | file = anon_inode_getfile("[io_uring]", &io_uring_fops, ctx, | |
7805 | O_RDWR | O_CLOEXEC); | |
7806 | if (IS_ERR(file)) { | |
7807 | put_unused_fd(ret); | |
7808 | ret = PTR_ERR(file); | |
7809 | goto err; | |
7810 | } | |
7811 | ||
7812 | #if defined(CONFIG_UNIX) | |
7813 | ctx->ring_sock->file = file; | |
7814 | #endif | |
7815 | fd_install(ret, file); | |
7816 | return ret; | |
7817 | err: | |
7818 | #if defined(CONFIG_UNIX) | |
7819 | sock_release(ctx->ring_sock); | |
7820 | ctx->ring_sock = NULL; | |
7821 | #endif | |
7822 | return ret; | |
7823 | } | |
7824 | ||
7f13657d XW |
7825 | static int io_uring_create(unsigned entries, struct io_uring_params *p, |
7826 | struct io_uring_params __user *params) | |
2b188cc1 JA |
7827 | { |
7828 | struct user_struct *user = NULL; | |
7829 | struct io_ring_ctx *ctx; | |
7830 | bool account_mem; | |
7831 | int ret; | |
7832 | ||
8110c1a6 | 7833 | if (!entries) |
2b188cc1 | 7834 | return -EINVAL; |
8110c1a6 JA |
7835 | if (entries > IORING_MAX_ENTRIES) { |
7836 | if (!(p->flags & IORING_SETUP_CLAMP)) | |
7837 | return -EINVAL; | |
7838 | entries = IORING_MAX_ENTRIES; | |
7839 | } | |
2b188cc1 JA |
7840 | |
7841 | /* | |
7842 | * Use twice as many entries for the CQ ring. It's possible for the | |
7843 | * application to drive a higher depth than the size of the SQ ring, | |
7844 | * since the sqes are only used at submission time. This allows for | |
33a107f0 JA |
7845 | * some flexibility in overcommitting a bit. If the application has |
7846 | * set IORING_SETUP_CQSIZE, it will have passed in the desired number | |
7847 | * of CQ ring entries manually. | |
2b188cc1 JA |
7848 | */ |
7849 | p->sq_entries = roundup_pow_of_two(entries); | |
33a107f0 JA |
7850 | if (p->flags & IORING_SETUP_CQSIZE) { |
7851 | /* | |
7852 | * If IORING_SETUP_CQSIZE is set, we do the same roundup | |
7853 | * to a power-of-two, if it isn't already. We do NOT impose | |
7854 | * any cq vs sq ring sizing. | |
7855 | */ | |
8110c1a6 | 7856 | if (p->cq_entries < p->sq_entries) |
33a107f0 | 7857 | return -EINVAL; |
8110c1a6 JA |
7858 | if (p->cq_entries > IORING_MAX_CQ_ENTRIES) { |
7859 | if (!(p->flags & IORING_SETUP_CLAMP)) | |
7860 | return -EINVAL; | |
7861 | p->cq_entries = IORING_MAX_CQ_ENTRIES; | |
7862 | } | |
33a107f0 JA |
7863 | p->cq_entries = roundup_pow_of_two(p->cq_entries); |
7864 | } else { | |
7865 | p->cq_entries = 2 * p->sq_entries; | |
7866 | } | |
2b188cc1 JA |
7867 | |
7868 | user = get_uid(current_user()); | |
7869 | account_mem = !capable(CAP_IPC_LOCK); | |
7870 | ||
7871 | if (account_mem) { | |
7872 | ret = io_account_mem(user, | |
7873 | ring_pages(p->sq_entries, p->cq_entries)); | |
7874 | if (ret) { | |
7875 | free_uid(user); | |
7876 | return ret; | |
7877 | } | |
7878 | } | |
7879 | ||
7880 | ctx = io_ring_ctx_alloc(p); | |
7881 | if (!ctx) { | |
7882 | if (account_mem) | |
7883 | io_unaccount_mem(user, ring_pages(p->sq_entries, | |
7884 | p->cq_entries)); | |
7885 | free_uid(user); | |
7886 | return -ENOMEM; | |
7887 | } | |
7888 | ctx->compat = in_compat_syscall(); | |
7889 | ctx->account_mem = account_mem; | |
7890 | ctx->user = user; | |
0b8c0ec7 | 7891 | ctx->creds = get_current_cred(); |
2b188cc1 JA |
7892 | |
7893 | ret = io_allocate_scq_urings(ctx, p); | |
7894 | if (ret) | |
7895 | goto err; | |
7896 | ||
6c271ce2 | 7897 | ret = io_sq_offload_start(ctx, p); |
2b188cc1 JA |
7898 | if (ret) |
7899 | goto err; | |
7900 | ||
2b188cc1 | 7901 | memset(&p->sq_off, 0, sizeof(p->sq_off)); |
75b28aff HV |
7902 | p->sq_off.head = offsetof(struct io_rings, sq.head); |
7903 | p->sq_off.tail = offsetof(struct io_rings, sq.tail); | |
7904 | p->sq_off.ring_mask = offsetof(struct io_rings, sq_ring_mask); | |
7905 | p->sq_off.ring_entries = offsetof(struct io_rings, sq_ring_entries); | |
7906 | p->sq_off.flags = offsetof(struct io_rings, sq_flags); | |
7907 | p->sq_off.dropped = offsetof(struct io_rings, sq_dropped); | |
7908 | p->sq_off.array = (char *)ctx->sq_array - (char *)ctx->rings; | |
2b188cc1 JA |
7909 | |
7910 | memset(&p->cq_off, 0, sizeof(p->cq_off)); | |
75b28aff HV |
7911 | p->cq_off.head = offsetof(struct io_rings, cq.head); |
7912 | p->cq_off.tail = offsetof(struct io_rings, cq.tail); | |
7913 | p->cq_off.ring_mask = offsetof(struct io_rings, cq_ring_mask); | |
7914 | p->cq_off.ring_entries = offsetof(struct io_rings, cq_ring_entries); | |
7915 | p->cq_off.overflow = offsetof(struct io_rings, cq_overflow); | |
7916 | p->cq_off.cqes = offsetof(struct io_rings, cqes); | |
0d9b5b3a | 7917 | p->cq_off.flags = offsetof(struct io_rings, cq_flags); |
ac90f249 | 7918 | |
7f13657d XW |
7919 | p->features = IORING_FEAT_SINGLE_MMAP | IORING_FEAT_NODROP | |
7920 | IORING_FEAT_SUBMIT_STABLE | IORING_FEAT_RW_CUR_POS | | |
7921 | IORING_FEAT_CUR_PERSONALITY | IORING_FEAT_FAST_POLL; | |
7922 | ||
7923 | if (copy_to_user(params, p, sizeof(*p))) { | |
7924 | ret = -EFAULT; | |
7925 | goto err; | |
7926 | } | |
044c1ab3 JA |
7927 | /* |
7928 | * Install ring fd as the very last thing, so we don't risk someone | |
7929 | * having closed it before we finish setup | |
7930 | */ | |
7931 | ret = io_uring_get_fd(ctx); | |
7932 | if (ret < 0) | |
7933 | goto err; | |
7934 | ||
c826bd7a | 7935 | trace_io_uring_create(ret, ctx, p->sq_entries, p->cq_entries, p->flags); |
2b188cc1 JA |
7936 | return ret; |
7937 | err: | |
7938 | io_ring_ctx_wait_and_kill(ctx); | |
7939 | return ret; | |
7940 | } | |
7941 | ||
7942 | /* | |
7943 | * Sets up an aio uring context, and returns the fd. Applications asks for a | |
7944 | * ring size, we return the actual sq/cq ring sizes (among other things) in the | |
7945 | * params structure passed in. | |
7946 | */ | |
7947 | static long io_uring_setup(u32 entries, struct io_uring_params __user *params) | |
7948 | { | |
7949 | struct io_uring_params p; | |
2b188cc1 JA |
7950 | int i; |
7951 | ||
7952 | if (copy_from_user(&p, params, sizeof(p))) | |
7953 | return -EFAULT; | |
7954 | for (i = 0; i < ARRAY_SIZE(p.resv); i++) { | |
7955 | if (p.resv[i]) | |
7956 | return -EINVAL; | |
7957 | } | |
7958 | ||
6c271ce2 | 7959 | if (p.flags & ~(IORING_SETUP_IOPOLL | IORING_SETUP_SQPOLL | |
8110c1a6 | 7960 | IORING_SETUP_SQ_AFF | IORING_SETUP_CQSIZE | |
24369c2e | 7961 | IORING_SETUP_CLAMP | IORING_SETUP_ATTACH_WQ)) |
2b188cc1 JA |
7962 | return -EINVAL; |
7963 | ||
7f13657d | 7964 | return io_uring_create(entries, &p, params); |
2b188cc1 JA |
7965 | } |
7966 | ||
7967 | SYSCALL_DEFINE2(io_uring_setup, u32, entries, | |
7968 | struct io_uring_params __user *, params) | |
7969 | { | |
7970 | return io_uring_setup(entries, params); | |
7971 | } | |
7972 | ||
66f4af93 JA |
7973 | static int io_probe(struct io_ring_ctx *ctx, void __user *arg, unsigned nr_args) |
7974 | { | |
7975 | struct io_uring_probe *p; | |
7976 | size_t size; | |
7977 | int i, ret; | |
7978 | ||
7979 | size = struct_size(p, ops, nr_args); | |
7980 | if (size == SIZE_MAX) | |
7981 | return -EOVERFLOW; | |
7982 | p = kzalloc(size, GFP_KERNEL); | |
7983 | if (!p) | |
7984 | return -ENOMEM; | |
7985 | ||
7986 | ret = -EFAULT; | |
7987 | if (copy_from_user(p, arg, size)) | |
7988 | goto out; | |
7989 | ret = -EINVAL; | |
7990 | if (memchr_inv(p, 0, size)) | |
7991 | goto out; | |
7992 | ||
7993 | p->last_op = IORING_OP_LAST - 1; | |
7994 | if (nr_args > IORING_OP_LAST) | |
7995 | nr_args = IORING_OP_LAST; | |
7996 | ||
7997 | for (i = 0; i < nr_args; i++) { | |
7998 | p->ops[i].op = i; | |
7999 | if (!io_op_defs[i].not_supported) | |
8000 | p->ops[i].flags = IO_URING_OP_SUPPORTED; | |
8001 | } | |
8002 | p->ops_len = i; | |
8003 | ||
8004 | ret = 0; | |
8005 | if (copy_to_user(arg, p, size)) | |
8006 | ret = -EFAULT; | |
8007 | out: | |
8008 | kfree(p); | |
8009 | return ret; | |
8010 | } | |
8011 | ||
071698e1 JA |
8012 | static int io_register_personality(struct io_ring_ctx *ctx) |
8013 | { | |
8014 | const struct cred *creds = get_current_cred(); | |
8015 | int id; | |
8016 | ||
8017 | id = idr_alloc_cyclic(&ctx->personality_idr, (void *) creds, 1, | |
8018 | USHRT_MAX, GFP_KERNEL); | |
8019 | if (id < 0) | |
8020 | put_cred(creds); | |
8021 | return id; | |
8022 | } | |
8023 | ||
8024 | static int io_unregister_personality(struct io_ring_ctx *ctx, unsigned id) | |
8025 | { | |
8026 | const struct cred *old_creds; | |
8027 | ||
8028 | old_creds = idr_remove(&ctx->personality_idr, id); | |
8029 | if (old_creds) { | |
8030 | put_cred(old_creds); | |
8031 | return 0; | |
8032 | } | |
8033 | ||
8034 | return -EINVAL; | |
8035 | } | |
8036 | ||
8037 | static bool io_register_op_must_quiesce(int op) | |
8038 | { | |
8039 | switch (op) { | |
8040 | case IORING_UNREGISTER_FILES: | |
8041 | case IORING_REGISTER_FILES_UPDATE: | |
8042 | case IORING_REGISTER_PROBE: | |
8043 | case IORING_REGISTER_PERSONALITY: | |
8044 | case IORING_UNREGISTER_PERSONALITY: | |
8045 | return false; | |
8046 | default: | |
8047 | return true; | |
8048 | } | |
8049 | } | |
8050 | ||
edafccee JA |
8051 | static int __io_uring_register(struct io_ring_ctx *ctx, unsigned opcode, |
8052 | void __user *arg, unsigned nr_args) | |
b19062a5 JA |
8053 | __releases(ctx->uring_lock) |
8054 | __acquires(ctx->uring_lock) | |
edafccee JA |
8055 | { |
8056 | int ret; | |
8057 | ||
35fa71a0 JA |
8058 | /* |
8059 | * We're inside the ring mutex, if the ref is already dying, then | |
8060 | * someone else killed the ctx or is already going through | |
8061 | * io_uring_register(). | |
8062 | */ | |
8063 | if (percpu_ref_is_dying(&ctx->refs)) | |
8064 | return -ENXIO; | |
8065 | ||
071698e1 | 8066 | if (io_register_op_must_quiesce(opcode)) { |
05f3fb3c | 8067 | percpu_ref_kill(&ctx->refs); |
b19062a5 | 8068 | |
05f3fb3c JA |
8069 | /* |
8070 | * Drop uring mutex before waiting for references to exit. If | |
8071 | * another thread is currently inside io_uring_enter() it might | |
8072 | * need to grab the uring_lock to make progress. If we hold it | |
8073 | * here across the drain wait, then we can deadlock. It's safe | |
8074 | * to drop the mutex here, since no new references will come in | |
8075 | * after we've killed the percpu ref. | |
8076 | */ | |
8077 | mutex_unlock(&ctx->uring_lock); | |
0f158b4c | 8078 | ret = wait_for_completion_interruptible(&ctx->ref_comp); |
05f3fb3c | 8079 | mutex_lock(&ctx->uring_lock); |
c150368b JA |
8080 | if (ret) { |
8081 | percpu_ref_resurrect(&ctx->refs); | |
8082 | ret = -EINTR; | |
8083 | goto out; | |
8084 | } | |
05f3fb3c | 8085 | } |
edafccee JA |
8086 | |
8087 | switch (opcode) { | |
8088 | case IORING_REGISTER_BUFFERS: | |
8089 | ret = io_sqe_buffer_register(ctx, arg, nr_args); | |
8090 | break; | |
8091 | case IORING_UNREGISTER_BUFFERS: | |
8092 | ret = -EINVAL; | |
8093 | if (arg || nr_args) | |
8094 | break; | |
8095 | ret = io_sqe_buffer_unregister(ctx); | |
8096 | break; | |
6b06314c JA |
8097 | case IORING_REGISTER_FILES: |
8098 | ret = io_sqe_files_register(ctx, arg, nr_args); | |
8099 | break; | |
8100 | case IORING_UNREGISTER_FILES: | |
8101 | ret = -EINVAL; | |
8102 | if (arg || nr_args) | |
8103 | break; | |
8104 | ret = io_sqe_files_unregister(ctx); | |
8105 | break; | |
c3a31e60 JA |
8106 | case IORING_REGISTER_FILES_UPDATE: |
8107 | ret = io_sqe_files_update(ctx, arg, nr_args); | |
8108 | break; | |
9b402849 | 8109 | case IORING_REGISTER_EVENTFD: |
f2842ab5 | 8110 | case IORING_REGISTER_EVENTFD_ASYNC: |
9b402849 JA |
8111 | ret = -EINVAL; |
8112 | if (nr_args != 1) | |
8113 | break; | |
8114 | ret = io_eventfd_register(ctx, arg); | |
f2842ab5 JA |
8115 | if (ret) |
8116 | break; | |
8117 | if (opcode == IORING_REGISTER_EVENTFD_ASYNC) | |
8118 | ctx->eventfd_async = 1; | |
8119 | else | |
8120 | ctx->eventfd_async = 0; | |
9b402849 JA |
8121 | break; |
8122 | case IORING_UNREGISTER_EVENTFD: | |
8123 | ret = -EINVAL; | |
8124 | if (arg || nr_args) | |
8125 | break; | |
8126 | ret = io_eventfd_unregister(ctx); | |
8127 | break; | |
66f4af93 JA |
8128 | case IORING_REGISTER_PROBE: |
8129 | ret = -EINVAL; | |
8130 | if (!arg || nr_args > 256) | |
8131 | break; | |
8132 | ret = io_probe(ctx, arg, nr_args); | |
8133 | break; | |
071698e1 JA |
8134 | case IORING_REGISTER_PERSONALITY: |
8135 | ret = -EINVAL; | |
8136 | if (arg || nr_args) | |
8137 | break; | |
8138 | ret = io_register_personality(ctx); | |
8139 | break; | |
8140 | case IORING_UNREGISTER_PERSONALITY: | |
8141 | ret = -EINVAL; | |
8142 | if (arg) | |
8143 | break; | |
8144 | ret = io_unregister_personality(ctx, nr_args); | |
8145 | break; | |
edafccee JA |
8146 | default: |
8147 | ret = -EINVAL; | |
8148 | break; | |
8149 | } | |
8150 | ||
071698e1 | 8151 | if (io_register_op_must_quiesce(opcode)) { |
05f3fb3c | 8152 | /* bring the ctx back to life */ |
05f3fb3c | 8153 | percpu_ref_reinit(&ctx->refs); |
c150368b | 8154 | out: |
0f158b4c | 8155 | reinit_completion(&ctx->ref_comp); |
05f3fb3c | 8156 | } |
edafccee JA |
8157 | return ret; |
8158 | } | |
8159 | ||
8160 | SYSCALL_DEFINE4(io_uring_register, unsigned int, fd, unsigned int, opcode, | |
8161 | void __user *, arg, unsigned int, nr_args) | |
8162 | { | |
8163 | struct io_ring_ctx *ctx; | |
8164 | long ret = -EBADF; | |
8165 | struct fd f; | |
8166 | ||
8167 | f = fdget(fd); | |
8168 | if (!f.file) | |
8169 | return -EBADF; | |
8170 | ||
8171 | ret = -EOPNOTSUPP; | |
8172 | if (f.file->f_op != &io_uring_fops) | |
8173 | goto out_fput; | |
8174 | ||
8175 | ctx = f.file->private_data; | |
8176 | ||
8177 | mutex_lock(&ctx->uring_lock); | |
8178 | ret = __io_uring_register(ctx, opcode, arg, nr_args); | |
8179 | mutex_unlock(&ctx->uring_lock); | |
c826bd7a DD |
8180 | trace_io_uring_register(ctx, opcode, ctx->nr_user_files, ctx->nr_user_bufs, |
8181 | ctx->cq_ev_fd != NULL, ret); | |
edafccee JA |
8182 | out_fput: |
8183 | fdput(f); | |
8184 | return ret; | |
8185 | } | |
8186 | ||
2b188cc1 JA |
8187 | static int __init io_uring_init(void) |
8188 | { | |
d7f62e82 SM |
8189 | #define __BUILD_BUG_VERIFY_ELEMENT(stype, eoffset, etype, ename) do { \ |
8190 | BUILD_BUG_ON(offsetof(stype, ename) != eoffset); \ | |
8191 | BUILD_BUG_ON(sizeof(etype) != sizeof_field(stype, ename)); \ | |
8192 | } while (0) | |
8193 | ||
8194 | #define BUILD_BUG_SQE_ELEM(eoffset, etype, ename) \ | |
8195 | __BUILD_BUG_VERIFY_ELEMENT(struct io_uring_sqe, eoffset, etype, ename) | |
8196 | BUILD_BUG_ON(sizeof(struct io_uring_sqe) != 64); | |
8197 | BUILD_BUG_SQE_ELEM(0, __u8, opcode); | |
8198 | BUILD_BUG_SQE_ELEM(1, __u8, flags); | |
8199 | BUILD_BUG_SQE_ELEM(2, __u16, ioprio); | |
8200 | BUILD_BUG_SQE_ELEM(4, __s32, fd); | |
8201 | BUILD_BUG_SQE_ELEM(8, __u64, off); | |
8202 | BUILD_BUG_SQE_ELEM(8, __u64, addr2); | |
8203 | BUILD_BUG_SQE_ELEM(16, __u64, addr); | |
7d67af2c | 8204 | BUILD_BUG_SQE_ELEM(16, __u64, splice_off_in); |
d7f62e82 SM |
8205 | BUILD_BUG_SQE_ELEM(24, __u32, len); |
8206 | BUILD_BUG_SQE_ELEM(28, __kernel_rwf_t, rw_flags); | |
8207 | BUILD_BUG_SQE_ELEM(28, /* compat */ int, rw_flags); | |
8208 | BUILD_BUG_SQE_ELEM(28, /* compat */ __u32, rw_flags); | |
8209 | BUILD_BUG_SQE_ELEM(28, __u32, fsync_flags); | |
8210 | BUILD_BUG_SQE_ELEM(28, __u16, poll_events); | |
8211 | BUILD_BUG_SQE_ELEM(28, __u32, sync_range_flags); | |
8212 | BUILD_BUG_SQE_ELEM(28, __u32, msg_flags); | |
8213 | BUILD_BUG_SQE_ELEM(28, __u32, timeout_flags); | |
8214 | BUILD_BUG_SQE_ELEM(28, __u32, accept_flags); | |
8215 | BUILD_BUG_SQE_ELEM(28, __u32, cancel_flags); | |
8216 | BUILD_BUG_SQE_ELEM(28, __u32, open_flags); | |
8217 | BUILD_BUG_SQE_ELEM(28, __u32, statx_flags); | |
8218 | BUILD_BUG_SQE_ELEM(28, __u32, fadvise_advice); | |
7d67af2c | 8219 | BUILD_BUG_SQE_ELEM(28, __u32, splice_flags); |
d7f62e82 SM |
8220 | BUILD_BUG_SQE_ELEM(32, __u64, user_data); |
8221 | BUILD_BUG_SQE_ELEM(40, __u16, buf_index); | |
8222 | BUILD_BUG_SQE_ELEM(42, __u16, personality); | |
7d67af2c | 8223 | BUILD_BUG_SQE_ELEM(44, __s32, splice_fd_in); |
d7f62e82 | 8224 | |
d3656344 | 8225 | BUILD_BUG_ON(ARRAY_SIZE(io_op_defs) != IORING_OP_LAST); |
84557871 | 8226 | BUILD_BUG_ON(__REQ_F_LAST_BIT >= 8 * sizeof(int)); |
2b188cc1 JA |
8227 | req_cachep = KMEM_CACHE(io_kiocb, SLAB_HWCACHE_ALIGN | SLAB_PANIC); |
8228 | return 0; | |
8229 | }; | |
8230 | __initcall(io_uring_init); |